mirrors/gstreamer
mirrors/gstreamer
1
1
Fork 0
mirror of https://gitlab.freedesktop.org/gstreamer/gstreamer.git synced 2024-11-18 07:47:17 +00:00
Code Issues 1 Projects Releases Wiki Activity
gstreamer/subprojects/gst-plugins-bad/ext/curl/gstcurlhttpsrc.c

Ignoring revisions in .git-blame-ignore-revs. Click here to bypass and see the normal blame view.

2169 lines
73 KiB
C
Raw Normal View History

curl: Add curlhttpsrc element Merged from https://github.com/bbc/gst-curlhttpsrc commit f8aabcfc5c50a44f3362de831377d6e86dcd2d49 https://bugzilla.gnome.org/show_bug.cgi?id=744261
2017-07-25 14:23:57 +00:00
/*
* GstCurlHttpSrc
* Copyright 2017 British Broadcasting Corporation - Research and Development
*
* Author: Sam Hurst <samuelh@rd.bbc.co.uk>
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
* DEALINGS IN THE SOFTWARE.
*
* Alternatively, the contents of this file may be used under the
* GNU Lesser General Public License Version 2.1 (the "LGPL"), in
* which case the following provisions apply instead of the ones
* mentioned above:
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
/**
* SECTION:element-curlhttpsrc
*
* This plugin reads data from a remote location specified by a URI, when the
* protocol is 'http' or 'https'.
*
* It is based on the cURL project (http://curl.haxx.se/) and is specifically
* designed to be also used with nghttp2 (http://nghttp2.org) to enable HTTP/2
* support for GStreamer. Your libcurl library MUST be compiled against nghttp2
* for HTTP/2 support for this functionality. HTTPS support is dependent on
* cURL being built with SSL support (OpenSSL/PolarSSL/NSS/GnuTLS).
*
* An HTTP proxy must be specified by URL.
* If the "http_proxy" environment variable is set, its value is used.
* The #GstCurlHttpSrc:proxy property can be used to override the default.
*
doc: remove xml from comments
2019-05-29 20:58:08 +00:00
* ## Example launch line
*
curl: Add curlhttpsrc element Merged from https://github.com/bbc/gst-curlhttpsrc commit f8aabcfc5c50a44f3362de831377d6e86dcd2d49 https://bugzilla.gnome.org/show_bug.cgi?id=744261
2017-07-25 14:23:57 +00:00
* |[
* gst-launch-1.0 curlhttpsrc location=http://127.0.1.1/index.html ! fakesink dump=1
* ]| The above pipeline reads a web page from the local machine using HTTP and
* dumps it to stdout.
* |[
* gst-launch-1.0 playbin uri=http://rdmedia.bbc.co.uk/dash/testmpds/multiperiod/bbb.php
* ]| The above pipeline will start up a DASH streaming session from the given
* MPD file. This requires GStreamer to have been built with dashdemux from
* gst-plugins-bad.
*/
curlhttpsrc: fix various leaks and thread safety issues curlhttpsrc uses a single thread running the gst_curl_http_src_curl_multi_loop() function to handle receiving data and messages from libcurl. Each instance of curlhttpsrc adds an entry into a queue in GstCurlHttpSrcMultiTaskContext and waits for the multi_loop to perform the HTTP request. Valgrind has shown up race conditions and memory leaks: 1. gst_curl_http_src_change_state() does not wait for the multi_loop to complete before going to the NULL state, which means that an instance of GstCurlHttpSrc can be released while gst_curl_http_src_curl_multi_loop() still has a reference to it. 2. if multiple elements try to be removed from the queue at once, only the last one is deleted. 3. source->caps is leaked 4. curl multi_handle is leaked 5. leak of curl_handle if URI not set 6. leak of http_headers when reusing element 7. null pointer dereference in negotiate caps 8. double-free of the default user-agent string 9. leak of multi_task_context.task This commit changes the logic so that each element has a connection status, which is used by the multi_loop to decide when to remove an element from its queue. An instance of curlhttpsrc will not enter the NULL state until its reference has been removed from the queue. When shutting down the curl multi loop, the memory allocated from the call to curl_multi_init() is now released. When gstadaptivedemux uses a URI source element, it will re-use it for multiple requests, moving it between READY and PLAYING between each request. curlhttpsrc was leaking the http_headers structure in this use case. The gst_curl_http_src_negotiate_caps() function extracts the "response-headers" field from the http_headers, but did not check that this field might be NULL. If the user-agent property is set, the global user-agent string was freed. This caused a double-free error if the user-agent is ever set a second time during the execution of the process. There are situations within curlhttpsrc where the code needs both the global multi_task_context mutex and the per-element buffer_mutex. To avoid deadlocks, it is vital that the order in which these are requested is always the same. This commit modifies the locking order to always be in the order: 1. multi_task_context.task_rec_mutex 2. buffer_mutex Fixes #876
2019-02-05 16:34:40 +00:00
/*
* Thread safety notes.
*
* GstCurlHttpSrc uses a single thread running the
* gst_curl_http_src_curl_multi_loop() function to handle receiving
* data and messages from libcurl. Each instance of GstCurlHttpSrc adds
* an entry into a queue in GstCurlHttpSrcMultiTaskContext and waits
* for the multi_loop to perform the HTTP request.
*
* When an instance of GstCurlHttpSrc wants to make a request (i.e.
* it has moved to the PLAYING state) it adds itself to the
* multi_task_context.queue list and signals the multi_loop task.
*
* Each instance of GstCurlHttpSrc uses buffer_mutex and buffer_cond
* to wait for gst_curl_http_src_curl_multi_loop() to perform the
* request and signal completion.
*
* Each instance of GstCurlHttpSrc is protected by the mutexes:
* 1. uri_mutex
* 2. buffer_mutex
*
* uri_mutex is used to protect access to the uri field.
*
* buffer_mutex is used to protect access to buffer_cond, state and
* connection_status.
*
* The gst_curl_http_src_curl_multi_loop() function uses the mutexes:
* 1. multi_task_context.task_rec_mutex
* 2. multi_task_context.mutex
*
* multi_task_context.task_rec_mutex is only used by GstTask.
*
* multi_task_context.mutex is used to protect access to queue and state
*
* To avoid deadlock, it is vital that if both multi_task_context.mutex
* and buffer_mutex are required, that they are locked in the order:
* 1. multi_task_context.mutex
* 2. buffer_mutex
*/
curl: Add curlhttpsrc element Merged from https://github.com/bbc/gst-curlhttpsrc commit f8aabcfc5c50a44f3362de831377d6e86dcd2d49 https://bugzilla.gnome.org/show_bug.cgi?id=744261
2017-07-25 14:23:57 +00:00
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
Replace gst-i18n-*.h with gi18n-lib.h GLib guarantees libintl is always present, using proxy-libintl as last resort. There is no need to mock gettex API any more. This fix static build on Windows because G_INTL_STATIC_COMPILATION must be defined before including libintl.h, and glib does it for us as part as including glib.h. Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/2028>
2022-03-25 13:59:23 +00:00
#include <glib/gi18n-lib.h>
curl: Add i18n
2017-11-21 15:30:17 +00:00
curl: allow per feature registration Split plugin into features including dynamic types which can be indiviually registered during a static build. More details here: https://gitlab.freedesktop.org/gstreamer/gst-build/-/merge_requests/199 https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/661 Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-bad/-/merge_requests/2038>
2021-02-17 10:55:14 +00:00
#include "gstcurlelements.h"
curl: Add curlhttpsrc element Merged from https://github.com/bbc/gst-curlhttpsrc commit f8aabcfc5c50a44f3362de831377d6e86dcd2d49 https://bugzilla.gnome.org/show_bug.cgi?id=744261
2017-07-25 14:23:57 +00:00
#include "gstcurlhttpsrc.h"
#include "gstcurlqueue.h"
curl: Reorganise header files to fix macOS builds https://bugzilla.gnome.org/show_bug.cgi?id=744261
2017-07-26 16:43:19 +00:00
#include "gstcurldefaults.h"
curl: Add curlhttpsrc element Merged from https://github.com/bbc/gst-curlhttpsrc commit f8aabcfc5c50a44f3362de831377d6e86dcd2d49 https://bugzilla.gnome.org/show_bug.cgi?id=744261
2017-07-25 14:23:57 +00:00
GST_DEBUG_CATEGORY_STATIC (gst_curl_http_src_debug);
#define GST_CAT_DEFAULT gst_curl_http_src_debug
GST_DEBUG_CATEGORY_STATIC (gst_curl_loop_debug);
curlhttpsrc: export same HTTP error status as souphttpsrc To make it closer to a drop-in replacement for souphttpsrc, expose the same gst_error_message_with_details as souphttpsrc, so that applications can received the HTTP status code and reason when an error occurs.
2019-02-05 17:06:50 +00:00
#define CURL_HTTP_SRC_ERROR(src,cat,code,error_message) \
do { \
GST_ELEMENT_ERROR_WITH_DETAILS ((src), cat, code, ("%s", error_message), \
("%s (%d), URL: %s, Redirect to: %s", (src)->reason_phrase, \
(src)->status_code, (src)->uri, GST_STR_NULL ((src)->redirect_uri)), \
("http-status-code", G_TYPE_UINT, (src)->status_code, \
"http-redirect-uri", G_TYPE_STRING, GST_STR_NULL ((src)->redirect_uri), NULL)); \
} while(0)
curlhttpsrc: fix various leaks and thread safety issues curlhttpsrc uses a single thread running the gst_curl_http_src_curl_multi_loop() function to handle receiving data and messages from libcurl. Each instance of curlhttpsrc adds an entry into a queue in GstCurlHttpSrcMultiTaskContext and waits for the multi_loop to perform the HTTP request. Valgrind has shown up race conditions and memory leaks: 1. gst_curl_http_src_change_state() does not wait for the multi_loop to complete before going to the NULL state, which means that an instance of GstCurlHttpSrc can be released while gst_curl_http_src_curl_multi_loop() still has a reference to it. 2. if multiple elements try to be removed from the queue at once, only the last one is deleted. 3. source->caps is leaked 4. curl multi_handle is leaked 5. leak of curl_handle if URI not set 6. leak of http_headers when reusing element 7. null pointer dereference in negotiate caps 8. double-free of the default user-agent string 9. leak of multi_task_context.task This commit changes the logic so that each element has a connection status, which is used by the multi_loop to decide when to remove an element from its queue. An instance of curlhttpsrc will not enter the NULL state until its reference has been removed from the queue. When shutting down the curl multi loop, the memory allocated from the call to curl_multi_init() is now released. When gstadaptivedemux uses a URI source element, it will re-use it for multiple requests, moving it between READY and PLAYING between each request. curlhttpsrc was leaking the http_headers structure in this use case. The gst_curl_http_src_negotiate_caps() function extracts the "response-headers" field from the http_headers, but did not check that this field might be NULL. If the user-agent property is set, the global user-agent string was freed. This caused a double-free error if the user-agent is ever set a second time during the execution of the process. There are situations within curlhttpsrc where the code needs both the global multi_task_context mutex and the per-element buffer_mutex. To avoid deadlocks, it is vital that the order in which these are requested is always the same. This commit modifies the locking order to always be in the order: 1. multi_task_context.task_rec_mutex 2. buffer_mutex Fixes #876
2019-02-05 16:34:40 +00:00
enum
{
PROP_0,
PROP_URI,
PROP_USERNAME,
PROP_PASSWORD,
PROP_PROXYURI,
PROP_PROXYUSERNAME,
PROP_PROXYPASSWORD,
PROP_COOKIES,
PROP_USERAGENT,
PROP_HEADERS,
PROP_COMPRESS,
PROP_REDIRECT,
PROP_MAXREDIRECT,
PROP_KEEPALIVE,
PROP_TIMEOUT,
PROP_STRICT_SSL,
PROP_SSL_CA_FILE,
PROP_RETRIES,
PROP_CONNECTIONMAXTIME,
PROP_MAXCONCURRENT_SERVER,
PROP_MAXCONCURRENT_PROXY,
PROP_MAXCONCURRENT_GLOBAL,
PROP_HTTPVERSION,
PROP_IRADIO_MODE,
PROP_MAX
};
curl: Add curlhttpsrc element Merged from https://github.com/bbc/gst-curlhttpsrc commit f8aabcfc5c50a44f3362de831377d6e86dcd2d49 https://bugzilla.gnome.org/show_bug.cgi?id=744261
2017-07-25 14:23:57 +00:00
/*
* Make a source pad template to be able to kick out recv'd data
*/
static GstStaticPadTemplate srcpadtemplate = GST_STATIC_PAD_TEMPLATE ("src",
GST_PAD_SRC,
GST_PAD_ALWAYS,
GST_STATIC_CAPS_ANY);
/*
* Function Definitions
*/
/* Gstreamer generic element functions */
static void gst_curl_http_src_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec);
static void gst_curl_http_src_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec);
static void gst_curl_http_src_ref_multi (GstCurlHttpSrc * src);
static void gst_curl_http_src_unref_multi (GstCurlHttpSrc * src);
static void gst_curl_http_src_finalize (GObject * obj);
static GstFlowReturn gst_curl_http_src_create (GstPushSrc * psrc,
GstBuffer ** outbuf);
static GstFlowReturn gst_curl_http_src_handle_response (GstCurlHttpSrc * src);
static gboolean gst_curl_http_src_negotiate_caps (GstCurlHttpSrc * src);
static GstStateChangeReturn gst_curl_http_src_change_state (GstElement *
element, GstStateChange transition);
static void gst_curl_http_src_cleanup_instance (GstCurlHttpSrc * src);
static gboolean gst_curl_http_src_query (GstBaseSrc * bsrc, GstQuery * query);
static gboolean gst_curl_http_src_get_content_length (GstBaseSrc * bsrc,
guint64 * size);
curlhttpsrc: add support for range GET To allow curlhttpsrc to support DASH streams that use the on-demand profile, it needs to support HTTP Range GETs. In GStreamer, the RANGE is specified by issuing a GST_FORMAT_BYTES seek to set the start and end of the range. curlhttpsrc needs to implement seek and set the appropriate curl options to make it add the Range header to the request.
2019-05-24 16:33:33 +00:00
static gboolean gst_curl_http_src_is_seekable (GstBaseSrc * bsrc);
static gboolean gst_curl_http_src_do_seek (GstBaseSrc * bsrc,
GstSegment * segment);
curl: Add curlhttpsrc element Merged from https://github.com/bbc/gst-curlhttpsrc commit f8aabcfc5c50a44f3362de831377d6e86dcd2d49 https://bugzilla.gnome.org/show_bug.cgi?id=744261
2017-07-25 14:23:57 +00:00
static gboolean gst_curl_http_src_unlock (GstBaseSrc * bsrc);
static gboolean gst_curl_http_src_unlock_stop (GstBaseSrc * bsrc);
/* URI Handler functions */
static void gst_curl_http_src_uri_handler_init (gpointer g_iface,
gpointer iface_data);
static guint gst_curl_http_src_urihandler_get_type (GType type);
static const gchar *const *gst_curl_http_src_urihandler_get_protocols (GType
type);
static gchar *gst_curl_http_src_urihandler_get_uri (GstURIHandler * handler);
static gboolean gst_curl_http_src_urihandler_set_uri (GstURIHandler * handler,
const gchar * uri, GError ** error);
/* GstTask functions */
static void gst_curl_http_src_curl_multi_loop (gpointer thread_data);
static CURL *gst_curl_http_src_create_easy_handle (GstCurlHttpSrc * s);
static inline void gst_curl_http_src_destroy_easy_handle (GstCurlHttpSrc * src);
static size_t gst_curl_http_src_get_header (void *header, size_t size,
size_t nmemb, void *src);
static size_t gst_curl_http_src_get_chunks (void *chunk, size_t size,
size_t nmemb, void *src);
static void gst_curl_http_src_request_remove (GstCurlHttpSrc * src);
curlhttpsrc: fix various leaks and thread safety issues curlhttpsrc uses a single thread running the gst_curl_http_src_curl_multi_loop() function to handle receiving data and messages from libcurl. Each instance of curlhttpsrc adds an entry into a queue in GstCurlHttpSrcMultiTaskContext and waits for the multi_loop to perform the HTTP request. Valgrind has shown up race conditions and memory leaks: 1. gst_curl_http_src_change_state() does not wait for the multi_loop to complete before going to the NULL state, which means that an instance of GstCurlHttpSrc can be released while gst_curl_http_src_curl_multi_loop() still has a reference to it. 2. if multiple elements try to be removed from the queue at once, only the last one is deleted. 3. source->caps is leaked 4. curl multi_handle is leaked 5. leak of curl_handle if URI not set 6. leak of http_headers when reusing element 7. null pointer dereference in negotiate caps 8. double-free of the default user-agent string 9. leak of multi_task_context.task This commit changes the logic so that each element has a connection status, which is used by the multi_loop to decide when to remove an element from its queue. An instance of curlhttpsrc will not enter the NULL state until its reference has been removed from the queue. When shutting down the curl multi loop, the memory allocated from the call to curl_multi_init() is now released. When gstadaptivedemux uses a URI source element, it will re-use it for multiple requests, moving it between READY and PLAYING between each request. curlhttpsrc was leaking the http_headers structure in this use case. The gst_curl_http_src_negotiate_caps() function extracts the "response-headers" field from the http_headers, but did not check that this field might be NULL. If the user-agent property is set, the global user-agent string was freed. This caused a double-free error if the user-agent is ever set a second time during the execution of the process. There are situations within curlhttpsrc where the code needs both the global multi_task_context mutex and the per-element buffer_mutex. To avoid deadlocks, it is vital that the order in which these are requested is always the same. This commit modifies the locking order to always be in the order: 1. multi_task_context.task_rec_mutex 2. buffer_mutex Fixes #876
2019-02-05 16:34:40 +00:00
static void gst_curl_http_src_wait_until_removed (GstCurlHttpSrc * src);
curl: Add curlhttpsrc element Merged from https://github.com/bbc/gst-curlhttpsrc commit f8aabcfc5c50a44f3362de831377d6e86dcd2d49 https://bugzilla.gnome.org/show_bug.cgi?id=744261
2017-07-25 14:23:57 +00:00
static char *gst_curl_http_src_strcasestr (const char *haystack,
const char *needle);
curlhttpsrc: Hook up libcurl logging message to gstreamer CURLOPT_DEBUGFUNCTION option replaces the standard debug function used when CURLOPT_VERBOSE is in effect. This callback receives various debug information.
2019-07-23 09:24:11 +00:00
#ifndef GST_DISABLE_GST_DEBUG
static int gst_curl_http_src_get_debug (CURL * handle, curl_infotype type,
char *data, size_t size, void *clientp);
#endif
curl: Add curlhttpsrc element Merged from https://github.com/bbc/gst-curlhttpsrc commit f8aabcfc5c50a44f3362de831377d6e86dcd2d49 https://bugzilla.gnome.org/show_bug.cgi?id=744261
2017-07-25 14:23:57 +00:00
curlhttpsrc: fix various leaks and thread safety issues curlhttpsrc uses a single thread running the gst_curl_http_src_curl_multi_loop() function to handle receiving data and messages from libcurl. Each instance of curlhttpsrc adds an entry into a queue in GstCurlHttpSrcMultiTaskContext and waits for the multi_loop to perform the HTTP request. Valgrind has shown up race conditions and memory leaks: 1. gst_curl_http_src_change_state() does not wait for the multi_loop to complete before going to the NULL state, which means that an instance of GstCurlHttpSrc can be released while gst_curl_http_src_curl_multi_loop() still has a reference to it. 2. if multiple elements try to be removed from the queue at once, only the last one is deleted. 3. source->caps is leaked 4. curl multi_handle is leaked 5. leak of curl_handle if URI not set 6. leak of http_headers when reusing element 7. null pointer dereference in negotiate caps 8. double-free of the default user-agent string 9. leak of multi_task_context.task This commit changes the logic so that each element has a connection status, which is used by the multi_loop to decide when to remove an element from its queue. An instance of curlhttpsrc will not enter the NULL state until its reference has been removed from the queue. When shutting down the curl multi loop, the memory allocated from the call to curl_multi_init() is now released. When gstadaptivedemux uses a URI source element, it will re-use it for multiple requests, moving it between READY and PLAYING between each request. curlhttpsrc was leaking the http_headers structure in this use case. The gst_curl_http_src_negotiate_caps() function extracts the "response-headers" field from the http_headers, but did not check that this field might be NULL. If the user-agent property is set, the global user-agent string was freed. This caused a double-free error if the user-agent is ever set a second time during the execution of the process. There are situations within curlhttpsrc where the code needs both the global multi_task_context mutex and the per-element buffer_mutex. To avoid deadlocks, it is vital that the order in which these are requested is always the same. This commit modifies the locking order to always be in the order: 1. multi_task_context.task_rec_mutex 2. buffer_mutex Fixes #876
2019-02-05 16:34:40 +00:00
static curl_version_info_data *gst_curl_http_src_curl_capabilities = NULL;
static GstCurlHttpVersion pref_http_ver;
curl: Reorganise header files to fix macOS builds https://bugzilla.gnome.org/show_bug.cgi?id=744261
2017-07-26 16:43:19 +00:00
curlhttpsrc: set http-version class property as enum This matches better with the preferred_http_version which was already declared as enum. https://bugzilla.gnome.org/show_bug.cgi?id=785878
2017-08-07 09:25:17 +00:00
#define GST_TYPE_CURL_HTTP_VERSION (gst_curl_http_version_get_type ())
curlhttpsrc: fix various leaks and thread safety issues curlhttpsrc uses a single thread running the gst_curl_http_src_curl_multi_loop() function to handle receiving data and messages from libcurl. Each instance of curlhttpsrc adds an entry into a queue in GstCurlHttpSrcMultiTaskContext and waits for the multi_loop to perform the HTTP request. Valgrind has shown up race conditions and memory leaks: 1. gst_curl_http_src_change_state() does not wait for the multi_loop to complete before going to the NULL state, which means that an instance of GstCurlHttpSrc can be released while gst_curl_http_src_curl_multi_loop() still has a reference to it. 2. if multiple elements try to be removed from the queue at once, only the last one is deleted. 3. source->caps is leaked 4. curl multi_handle is leaked 5. leak of curl_handle if URI not set 6. leak of http_headers when reusing element 7. null pointer dereference in negotiate caps 8. double-free of the default user-agent string 9. leak of multi_task_context.task This commit changes the logic so that each element has a connection status, which is used by the multi_loop to decide when to remove an element from its queue. An instance of curlhttpsrc will not enter the NULL state until its reference has been removed from the queue. When shutting down the curl multi loop, the memory allocated from the call to curl_multi_init() is now released. When gstadaptivedemux uses a URI source element, it will re-use it for multiple requests, moving it between READY and PLAYING between each request. curlhttpsrc was leaking the http_headers structure in this use case. The gst_curl_http_src_negotiate_caps() function extracts the "response-headers" field from the http_headers, but did not check that this field might be NULL. If the user-agent property is set, the global user-agent string was freed. This caused a double-free error if the user-agent is ever set a second time during the execution of the process. There are situations within curlhttpsrc where the code needs both the global multi_task_context mutex and the per-element buffer_mutex. To avoid deadlocks, it is vital that the order in which these are requested is always the same. This commit modifies the locking order to always be in the order: 1. multi_task_context.task_rec_mutex 2. buffer_mutex Fixes #876
2019-02-05 16:34:40 +00:00
curlhttpsrc: set http-version class property as enum This matches better with the preferred_http_version which was already declared as enum. https://bugzilla.gnome.org/show_bug.cgi?id=785878
2017-08-07 09:25:17 +00:00
static GType
gst_curl_http_version_get_type (void)
{
static GType gtype = 0;
if (!gtype) {
static const GEnumValue http_versions[] = {
{GSTCURL_HTTP_VERSION_1_0, "HTTP Version 1.0", "1.0"},
{GSTCURL_HTTP_VERSION_1_1, "HTTP Version 1.1", "1.1"},
#ifdef CURL_VERSION_HTTP2
{GSTCURL_HTTP_VERSION_2_0, "HTTP Version 2.0", "2.0"},
#endif
{0, NULL, NULL}
};
gtype = g_enum_register_static ("GstCurlHttpVersionType", http_versions);
}
return gtype;
}
curl: Add curlhttpsrc element Merged from https://github.com/bbc/gst-curlhttpsrc commit f8aabcfc5c50a44f3362de831377d6e86dcd2d49 https://bugzilla.gnome.org/show_bug.cgi?id=744261
2017-07-25 14:23:57 +00:00
#define gst_curl_http_src_parent_class parent_class
G_DEFINE_TYPE_WITH_CODE (GstCurlHttpSrc, gst_curl_http_src, GST_TYPE_PUSH_SRC,
G_IMPLEMENT_INTERFACE (GST_TYPE_URI_HANDLER,
gst_curl_http_src_uri_handler_init));
curl: allow per feature registration Split plugin into features including dynamic types which can be indiviually registered during a static build. More details here: https://gitlab.freedesktop.org/gstreamer/gst-build/-/merge_requests/199 https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/661 Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-bad/-/merge_requests/2038>
2021-02-17 10:55:14 +00:00
GST_ELEMENT_REGISTER_DEFINE_WITH_CODE (curlhttpsrc, "curlhttpsrc",
GST_RANK_SECONDARY, GST_TYPE_CURLHTTPSRC, curl_element_init (plugin));
curl: Add curlhttpsrc element Merged from https://github.com/bbc/gst-curlhttpsrc commit f8aabcfc5c50a44f3362de831377d6e86dcd2d49 https://bugzilla.gnome.org/show_bug.cgi?id=744261
2017-07-25 14:23:57 +00:00
static void
gst_curl_http_src_class_init (GstCurlHttpSrcClass * klass)
{
GObjectClass *gobject_class;
GstElementClass *gstelement_class;
GstBaseSrcClass *gstbasesrc_class;
GstPushSrcClass *gstpushsrc_class;
const gchar *http_env;
curlhttpsrc: set http-version default if curl does not have HTTP2 feature present If the version of the curl library is recent enough to allow support for HTTP2 (i.e. CURL_VERSION_HTTP2 is defined) but does not actually have that feature enabled, the call to g_object_class_install_property() uses an incorrect default value for the "http-version" property. The default should be 1.1 if HTTP2 is not supported by libcurl or if not enabled by libcurl. https://bugzilla.gnome.org/show_bug.cgi?id=786049
2017-08-09 14:10:56 +00:00
GstCurlHttpVersion default_http_version;
curl: Add curlhttpsrc element Merged from https://github.com/bbc/gst-curlhttpsrc commit f8aabcfc5c50a44f3362de831377d6e86dcd2d49 https://bugzilla.gnome.org/show_bug.cgi?id=744261
2017-07-25 14:23:57 +00:00
gobject_class = (GObjectClass *) klass;
gstelement_class = (GstElementClass *) klass;
gstbasesrc_class = (GstBaseSrcClass *) klass;
gstpushsrc_class = (GstPushSrcClass *) klass;
GST_DEBUG_CATEGORY_INIT (gst_curl_http_src_debug, "curlhttpsrc",
0, "UriHandler for libcURL");
gstelement_class->change_state =
GST_DEBUG_FUNCPTR (gst_curl_http_src_change_state);
gstpushsrc_class->create = GST_DEBUG_FUNCPTR (gst_curl_http_src_create);
gstbasesrc_class->query = GST_DEBUG_FUNCPTR (gst_curl_http_src_query);
gstbasesrc_class->get_size =
GST_DEBUG_FUNCPTR (gst_curl_http_src_get_content_length);
curlhttpsrc: add support for range GET To allow curlhttpsrc to support DASH streams that use the on-demand profile, it needs to support HTTP Range GETs. In GStreamer, the RANGE is specified by issuing a GST_FORMAT_BYTES seek to set the start and end of the range. curlhttpsrc needs to implement seek and set the appropriate curl options to make it add the Range header to the request.
2019-05-24 16:33:33 +00:00
gstbasesrc_class->is_seekable =
GST_DEBUG_FUNCPTR (gst_curl_http_src_is_seekable);
gstbasesrc_class->do_seek = GST_DEBUG_FUNCPTR (gst_curl_http_src_do_seek);
curl: Add curlhttpsrc element Merged from https://github.com/bbc/gst-curlhttpsrc commit f8aabcfc5c50a44f3362de831377d6e86dcd2d49 https://bugzilla.gnome.org/show_bug.cgi?id=744261
2017-07-25 14:23:57 +00:00
gstbasesrc_class->unlock = GST_DEBUG_FUNCPTR (gst_curl_http_src_unlock);
gstbasesrc_class->unlock_stop =
GST_DEBUG_FUNCPTR (gst_curl_http_src_unlock_stop);
gst_element_class_add_pad_template (gstelement_class,
gst_static_pad_template_get (&srcpadtemplate));
gst_curl_http_src_curl_capabilities = curl_version_info (CURLVERSION_NOW);
curlhttpsrc: set http-version default if curl does not have HTTP2 feature present If the version of the curl library is recent enough to allow support for HTTP2 (i.e. CURL_VERSION_HTTP2 is defined) but does not actually have that feature enabled, the call to g_object_class_install_property() uses an incorrect default value for the "http-version" property. The default should be 1.1 if HTTP2 is not supported by libcurl or if not enabled by libcurl. https://bugzilla.gnome.org/show_bug.cgi?id=786049
2017-08-09 14:10:56 +00:00
#ifdef CURL_VERSION_HTTP2
if (gst_curl_http_src_curl_capabilities->features & CURL_VERSION_HTTP2) {
default_http_version = GSTCURL_HTTP_VERSION_2_0;
} else
#endif
default_http_version = GSTCURL_HTTP_VERSION_1_1;
curl: Add curlhttpsrc element Merged from https://github.com/bbc/gst-curlhttpsrc commit f8aabcfc5c50a44f3362de831377d6e86dcd2d49 https://bugzilla.gnome.org/show_bug.cgi?id=744261
2017-07-25 14:23:57 +00:00
http_env = g_getenv ("GST_CURL_HTTP_VER");
if (http_env != NULL) {
curlhttpsrc: set http-version class property as enum This matches better with the preferred_http_version which was already declared as enum. https://bugzilla.gnome.org/show_bug.cgi?id=785878
2017-08-07 09:25:17 +00:00
GST_INFO_OBJECT (klass, "Seen env var GST_CURL_HTTP_VER with value %s",
http_env);
if (!strcmp (http_env, "1.0")) {
pref_http_ver = GSTCURL_HTTP_VERSION_1_0;
} else if (!strcmp (http_env, "1.1")) {
pref_http_ver = GSTCURL_HTTP_VERSION_1_1;
} else if (!strcmp (http_env, "2.0")) {
#ifdef CURL_VERSION_HTTP2
if (gst_curl_http_src_curl_capabilities->features & CURL_VERSION_HTTP2) {
pref_http_ver = GSTCURL_HTTP_VERSION_2_0;
} else {
goto unsupported_http_version;
}
#endif
} else {
unsupported_http_version:
GST_WARNING_OBJECT (klass,
"Unsupported HTTP version: %s. Fallback to default", http_env);
curlhttpsrc: set http-version default if curl does not have HTTP2 feature present If the version of the curl library is recent enough to allow support for HTTP2 (i.e. CURL_VERSION_HTTP2 is defined) but does not actually have that feature enabled, the call to g_object_class_install_property() uses an incorrect default value for the "http-version" property. The default should be 1.1 if HTTP2 is not supported by libcurl or if not enabled by libcurl. https://bugzilla.gnome.org/show_bug.cgi?id=786049
2017-08-09 14:10:56 +00:00
pref_http_ver = default_http_version;
curlhttpsrc: set http-version class property as enum This matches better with the preferred_http_version which was already declared as enum. https://bugzilla.gnome.org/show_bug.cgi?id=785878
2017-08-07 09:25:17 +00:00
}
curl: Add curlhttpsrc element Merged from https://github.com/bbc/gst-curlhttpsrc commit f8aabcfc5c50a44f3362de831377d6e86dcd2d49 https://bugzilla.gnome.org/show_bug.cgi?id=744261
2017-07-25 14:23:57 +00:00
} else {
curlhttpsrc: set http-version default if curl does not have HTTP2 feature present If the version of the curl library is recent enough to allow support for HTTP2 (i.e. CURL_VERSION_HTTP2 is defined) but does not actually have that feature enabled, the call to g_object_class_install_property() uses an incorrect default value for the "http-version" property. The default should be 1.1 if HTTP2 is not supported by libcurl or if not enabled by libcurl. https://bugzilla.gnome.org/show_bug.cgi?id=786049
2017-08-09 14:10:56 +00:00
pref_http_ver = default_http_version;
curl: Add curlhttpsrc element Merged from https://github.com/bbc/gst-curlhttpsrc commit f8aabcfc5c50a44f3362de831377d6e86dcd2d49 https://bugzilla.gnome.org/show_bug.cgi?id=744261
2017-07-25 14:23:57 +00:00
}
gobject_class->set_property = gst_curl_http_src_set_property;
gobject_class->get_property = gst_curl_http_src_get_property;
gobject_class->finalize = gst_curl_http_src_finalize;
g_object_class_install_property (gobject_class, PROP_URI,
g_param_spec_string ("location", "Location", "URI of resource to read",
GSTCURL_HANDLE_DEFAULT_CURLOPT_URL,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class, PROP_USERNAME,
g_param_spec_string ("user-id", "user-id",
"HTTP location URI user id for authentication",
GSTCURL_HANDLE_DEFAULT_CURLOPT_USERNAME,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class, PROP_PASSWORD,
g_param_spec_string ("user-pw", "user-pw",
"HTTP location URI password for authentication",
GSTCURL_HANDLE_DEFAULT_CURLOPT_PASSWORD,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class, PROP_PROXYURI,
g_param_spec_string ("proxy", "Proxy", "URI of HTTP proxy server",
GSTCURL_HANDLE_DEFAULT_CURLOPT_PROXY,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class, PROP_PROXYUSERNAME,
g_param_spec_string ("proxy-id", "proxy-id",
"HTTP proxy URI user id for authentication",
GSTCURL_HANDLE_DEFAULT_CURLOPT_PROXYUSERNAME,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class, PROP_PROXYPASSWORD,
g_param_spec_string ("proxy-pw", "proxy-pw",
"HTTP proxy URI password for authentication",
GSTCURL_HANDLE_DEFAULT_CURLOPT_PROXYPASSWORD,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class, PROP_COOKIES,
g_param_spec_boxed ("cookies", "Cookies", "List of HTTP Cookies",
G_TYPE_STRV, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class, PROP_USERAGENT,
g_param_spec_string ("user-agent", "User-Agent",
curlhttpsrc: fix various leaks and thread safety issues curlhttpsrc uses a single thread running the gst_curl_http_src_curl_multi_loop() function to handle receiving data and messages from libcurl. Each instance of curlhttpsrc adds an entry into a queue in GstCurlHttpSrcMultiTaskContext and waits for the multi_loop to perform the HTTP request. Valgrind has shown up race conditions and memory leaks: 1. gst_curl_http_src_change_state() does not wait for the multi_loop to complete before going to the NULL state, which means that an instance of GstCurlHttpSrc can be released while gst_curl_http_src_curl_multi_loop() still has a reference to it. 2. if multiple elements try to be removed from the queue at once, only the last one is deleted. 3. source->caps is leaked 4. curl multi_handle is leaked 5. leak of curl_handle if URI not set 6. leak of http_headers when reusing element 7. null pointer dereference in negotiate caps 8. double-free of the default user-agent string 9. leak of multi_task_context.task This commit changes the logic so that each element has a connection status, which is used by the multi_loop to decide when to remove an element from its queue. An instance of curlhttpsrc will not enter the NULL state until its reference has been removed from the queue. When shutting down the curl multi loop, the memory allocated from the call to curl_multi_init() is now released. When gstadaptivedemux uses a URI source element, it will re-use it for multiple requests, moving it between READY and PLAYING between each request. curlhttpsrc was leaking the http_headers structure in this use case. The gst_curl_http_src_negotiate_caps() function extracts the "response-headers" field from the http_headers, but did not check that this field might be NULL. If the user-agent property is set, the global user-agent string was freed. This caused a double-free error if the user-agent is ever set a second time during the execution of the process. There are situations within curlhttpsrc where the code needs both the global multi_task_context mutex and the per-element buffer_mutex. To avoid deadlocks, it is vital that the order in which these are requested is always the same. This commit modifies the locking order to always be in the order: 1. multi_task_context.task_rec_mutex 2. buffer_mutex Fixes #876
2019-02-05 16:34:40 +00:00
"URI of resource requested",
GSTCURL_HANDLE_DEFAULT_CURLOPT_USERAGENT "/<curl-version>",
Mark some properties as DOC_SHOW_DEFAULT
2018-11-12 21:24:20 +00:00
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS |
GST_PARAM_DOC_SHOW_DEFAULT));
curl: Add curlhttpsrc element Merged from https://github.com/bbc/gst-curlhttpsrc commit f8aabcfc5c50a44f3362de831377d6e86dcd2d49 https://bugzilla.gnome.org/show_bug.cgi?id=744261
2017-07-25 14:23:57 +00:00
g_object_class_install_property (gobject_class, PROP_COMPRESS,
g_param_spec_boolean ("compress", "Compress",
"Allow compressed content encodings",
GSTCURL_HANDLE_DEFAULT_CURLOPT_ACCEPT_ENCODING,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class, PROP_REDIRECT,
g_param_spec_boolean ("automatic-redirect", "automatic-redirect",
"Allow HTTP Redirections (HTTP Status Code 300 series)",
GSTCURL_HANDLE_DEFAULT_CURLOPT_FOLLOWLOCATION,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class, PROP_MAXREDIRECT,
g_param_spec_int ("max-redirect", "Max-Redirect",
"Maximum number of permitted redirections. -1 is unlimited.",
GSTCURL_HANDLE_MIN_CURLOPT_MAXREDIRS,
GSTCURL_HANDLE_MAX_CURLOPT_MAXREDIRS,
GSTCURL_HANDLE_DEFAULT_CURLOPT_MAXREDIRS,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class, PROP_KEEPALIVE,
g_param_spec_boolean ("keep-alive", "Keep-Alive",
"Toggle keep-alive for connection reuse.",
GSTCURL_HANDLE_DEFAULT_CURLOPT_TCP_KEEPALIVE,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class, PROP_TIMEOUT,
g_param_spec_int ("timeout", "Timeout",
"Value in seconds before timeout a blocking request (0 = no timeout)",
GSTCURL_HANDLE_MIN_CURLOPT_TIMEOUT,
GSTCURL_HANDLE_MAX_CURLOPT_TIMEOUT,
GSTCURL_HANDLE_DEFAULT_CURLOPT_TIMEOUT,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class, PROP_HEADERS,
g_param_spec_boxed ("extra-headers", "Extra Headers",
"Extra headers to append to the HTTP request",
GST_TYPE_STRUCTURE, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class, PROP_STRICT_SSL,
g_param_spec_boolean ("ssl-strict", "SSL Strict",
"Strict SSL certificate checking",
GSTCURL_HANDLE_DEFAULT_CURLOPT_SSL_VERIFYPEER,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class, PROP_SSL_CA_FILE,
g_param_spec_string ("ssl-ca-file", "SSL CA File",
"Location of an SSL CA file to use for checking SSL certificates",
GSTCURL_HANDLE_DEFAULT_CURLOPT_CAINFO,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class, PROP_RETRIES,
g_param_spec_int ("retries", "Retries",
"Maximum number of retries until giving up (-1=infinite)",
GSTCURL_HANDLE_MIN_RETRIES, GSTCURL_HANDLE_MAX_RETRIES,
GSTCURL_HANDLE_DEFAULT_RETRIES,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class, PROP_CONNECTIONMAXTIME,
g_param_spec_uint ("max-connection-time", "Max-Connection-Time",
"Maximum amount of time to keep-alive HTTP connections",
GSTCURL_MIN_CONNECTION_TIME, GSTCURL_MAX_CONNECTION_TIME,
GSTCURL_DEFAULT_CONNECTION_TIME,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class, PROP_MAXCONCURRENT_SERVER,
g_param_spec_uint ("max-connections-per-server",
"Max-Connections-Per-Server",
"Maximum number of connections allowed per server for HTTP/1.x",
GSTCURL_MIN_CONNECTIONS_SERVER, GSTCURL_MAX_CONNECTIONS_SERVER,
GSTCURL_DEFAULT_CONNECTIONS_SERVER,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class, PROP_MAXCONCURRENT_PROXY,
g_param_spec_uint ("max-connections-per-proxy",
"Max-Connections-Per-Proxy",
"Maximum number of concurrent connections allowed per proxy for HTTP/1.x",
GSTCURL_MIN_CONNECTIONS_PROXY, GSTCURL_MAX_CONNECTIONS_PROXY,
GSTCURL_DEFAULT_CONNECTIONS_PROXY,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class, PROP_MAXCONCURRENT_GLOBAL,
g_param_spec_uint ("max-connections", "Max-Connections",
"Maximum number of concurrent connections allowed for HTTP/1.x",
GSTCURL_MIN_CONNECTIONS_GLOBAL, GSTCURL_MAX_CONNECTIONS_GLOBAL,
GSTCURL_DEFAULT_CONNECTIONS_GLOBAL,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
curlhttpsrc: set http-version class property as enum This matches better with the preferred_http_version which was already declared as enum. https://bugzilla.gnome.org/show_bug.cgi?id=785878
2017-08-07 09:25:17 +00:00
g_object_class_install_property (gobject_class, PROP_HTTPVERSION,
g_param_spec_enum ("http-version", "HTTP-Version",
"The preferred HTTP protocol version",
GST_TYPE_CURL_HTTP_VERSION, pref_http_ver,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
curl: Add curlhttpsrc element Merged from https://github.com/bbc/gst-curlhttpsrc commit f8aabcfc5c50a44f3362de831377d6e86dcd2d49 https://bugzilla.gnome.org/show_bug.cgi?id=744261
2017-07-25 14:23:57 +00:00
/* Add a debugging task so it's easier to debug in the Multi worker thread */
GST_DEBUG_CATEGORY_INIT (gst_curl_loop_debug, "curl_multi_loop", 0,
"libcURL loop thread debugging");
curlhttpsrc: Fix compilation without debugging system enabled
2017-07-26 07:19:42 +00:00
#ifndef GST_DISABLE_GST_DEBUG
curl: Add curlhttpsrc element Merged from https://github.com/bbc/gst-curlhttpsrc commit f8aabcfc5c50a44f3362de831377d6e86dcd2d49 https://bugzilla.gnome.org/show_bug.cgi?id=744261
2017-07-25 14:23:57 +00:00
gst_debug_log (gst_curl_loop_debug, GST_LEVEL_INFO, __FILE__, __func__,
__LINE__, NULL, "Testing the curl_multi_loop debugging prints");
curlhttpsrc: Fix compilation without debugging system enabled
2017-07-26 07:19:42 +00:00
#endif
curl: Add curlhttpsrc element Merged from https://github.com/bbc/gst-curlhttpsrc commit f8aabcfc5c50a44f3362de831377d6e86dcd2d49 https://bugzilla.gnome.org/show_bug.cgi?id=744261
2017-07-25 14:23:57 +00:00
curlhttpsrc: fix various leaks and thread safety issues curlhttpsrc uses a single thread running the gst_curl_http_src_curl_multi_loop() function to handle receiving data and messages from libcurl. Each instance of curlhttpsrc adds an entry into a queue in GstCurlHttpSrcMultiTaskContext and waits for the multi_loop to perform the HTTP request. Valgrind has shown up race conditions and memory leaks: 1. gst_curl_http_src_change_state() does not wait for the multi_loop to complete before going to the NULL state, which means that an instance of GstCurlHttpSrc can be released while gst_curl_http_src_curl_multi_loop() still has a reference to it. 2. if multiple elements try to be removed from the queue at once, only the last one is deleted. 3. source->caps is leaked 4. curl multi_handle is leaked 5. leak of curl_handle if URI not set 6. leak of http_headers when reusing element 7. null pointer dereference in negotiate caps 8. double-free of the default user-agent string 9. leak of multi_task_context.task This commit changes the logic so that each element has a connection status, which is used by the multi_loop to decide when to remove an element from its queue. An instance of curlhttpsrc will not enter the NULL state until its reference has been removed from the queue. When shutting down the curl multi loop, the memory allocated from the call to curl_multi_init() is now released. When gstadaptivedemux uses a URI source element, it will re-use it for multiple requests, moving it between READY and PLAYING between each request. curlhttpsrc was leaking the http_headers structure in this use case. The gst_curl_http_src_negotiate_caps() function extracts the "response-headers" field from the http_headers, but did not check that this field might be NULL. If the user-agent property is set, the global user-agent string was freed. This caused a double-free error if the user-agent is ever set a second time during the execution of the process. There are situations within curlhttpsrc where the code needs both the global multi_task_context mutex and the per-element buffer_mutex. To avoid deadlocks, it is vital that the order in which these are requested is always the same. This commit modifies the locking order to always be in the order: 1. multi_task_context.task_rec_mutex 2. buffer_mutex Fixes #876
2019-02-05 16:34:40 +00:00
klass->multi_task_context.task = NULL;
klass->multi_task_context.refcount = 0;
klass->multi_task_context.queue = NULL;
klass->multi_task_context.state = GSTCURL_MULTI_LOOP_STATE_STOP;
klass->multi_task_context.multi_handle = NULL;
curl: Add curlhttpsrc element Merged from https://github.com/bbc/gst-curlhttpsrc commit f8aabcfc5c50a44f3362de831377d6e86dcd2d49 https://bugzilla.gnome.org/show_bug.cgi?id=744261
2017-07-25 14:23:57 +00:00
g_mutex_init (&klass->multi_task_context.mutex);
g_cond_init (&klass->multi_task_context.signal);
gst_element_class_set_static_metadata (gstelement_class,
"HTTP Client Source using libcURL",
"Source/Network",
"Receiver data as a client over a network via HTTP using cURL",
"Sam Hurst <samuelh@rd.bbc.co.uk>");
plugins: Use gst_type_mark_as_plugin_api() for all non-element plugin types
2020-05-31 07:18:00 +00:00
plugins: uddate gst_type_mark_as_plugin_api() calls
2020-06-05 22:40:42 +00:00
gst_type_mark_as_plugin_api (GST_TYPE_CURL_HTTP_VERSION, 0);
curl: Add curlhttpsrc element Merged from https://github.com/bbc/gst-curlhttpsrc commit f8aabcfc5c50a44f3362de831377d6e86dcd2d49 https://bugzilla.gnome.org/show_bug.cgi?id=744261
2017-07-25 14:23:57 +00:00
}
static void
gst_curl_http_src_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec)
{
GstCurlHttpSrc *source = GST_CURLHTTPSRC (object);
GSTCURL_FUNCTION_ENTRY (source);
switch (prop_id) {
case PROP_URI:
curlhttpsrc: fix various leaks and thread safety issues curlhttpsrc uses a single thread running the gst_curl_http_src_curl_multi_loop() function to handle receiving data and messages from libcurl. Each instance of curlhttpsrc adds an entry into a queue in GstCurlHttpSrcMultiTaskContext and waits for the multi_loop to perform the HTTP request. Valgrind has shown up race conditions and memory leaks: 1. gst_curl_http_src_change_state() does not wait for the multi_loop to complete before going to the NULL state, which means that an instance of GstCurlHttpSrc can be released while gst_curl_http_src_curl_multi_loop() still has a reference to it. 2. if multiple elements try to be removed from the queue at once, only the last one is deleted. 3. source->caps is leaked 4. curl multi_handle is leaked 5. leak of curl_handle if URI not set 6. leak of http_headers when reusing element 7. null pointer dereference in negotiate caps 8. double-free of the default user-agent string 9. leak of multi_task_context.task This commit changes the logic so that each element has a connection status, which is used by the multi_loop to decide when to remove an element from its queue. An instance of curlhttpsrc will not enter the NULL state until its reference has been removed from the queue. When shutting down the curl multi loop, the memory allocated from the call to curl_multi_init() is now released. When gstadaptivedemux uses a URI source element, it will re-use it for multiple requests, moving it between READY and PLAYING between each request. curlhttpsrc was leaking the http_headers structure in this use case. The gst_curl_http_src_negotiate_caps() function extracts the "response-headers" field from the http_headers, but did not check that this field might be NULL. If the user-agent property is set, the global user-agent string was freed. This caused a double-free error if the user-agent is ever set a second time during the execution of the process. There are situations within curlhttpsrc where the code needs both the global multi_task_context mutex and the per-element buffer_mutex. To avoid deadlocks, it is vital that the order in which these are requested is always the same. This commit modifies the locking order to always be in the order: 1. multi_task_context.task_rec_mutex 2. buffer_mutex Fixes #876
2019-02-05 16:34:40 +00:00
g_mutex_lock (&source->uri_mutex);
curlhttpsrc: do not check for NULL before g_free() g_free() is NULL-safe.
2017-07-26 23:51:50 +00:00
g_free (source->uri);
curl: Add curlhttpsrc element Merged from https://github.com/bbc/gst-curlhttpsrc commit f8aabcfc5c50a44f3362de831377d6e86dcd2d49 https://bugzilla.gnome.org/show_bug.cgi?id=744261
2017-07-25 14:23:57 +00:00
source->uri = g_value_dup_string (value);
curlhttpsrc: fix various leaks and thread safety issues curlhttpsrc uses a single thread running the gst_curl_http_src_curl_multi_loop() function to handle receiving data and messages from libcurl. Each instance of curlhttpsrc adds an entry into a queue in GstCurlHttpSrcMultiTaskContext and waits for the multi_loop to perform the HTTP request. Valgrind has shown up race conditions and memory leaks: 1. gst_curl_http_src_change_state() does not wait for the multi_loop to complete before going to the NULL state, which means that an instance of GstCurlHttpSrc can be released while gst_curl_http_src_curl_multi_loop() still has a reference to it. 2. if multiple elements try to be removed from the queue at once, only the last one is deleted. 3. source->caps is leaked 4. curl multi_handle is leaked 5. leak of curl_handle if URI not set 6. leak of http_headers when reusing element 7. null pointer dereference in negotiate caps 8. double-free of the default user-agent string 9. leak of multi_task_context.task This commit changes the logic so that each element has a connection status, which is used by the multi_loop to decide when to remove an element from its queue. An instance of curlhttpsrc will not enter the NULL state until its reference has been removed from the queue. When shutting down the curl multi loop, the memory allocated from the call to curl_multi_init() is now released. When gstadaptivedemux uses a URI source element, it will re-use it for multiple requests, moving it between READY and PLAYING between each request. curlhttpsrc was leaking the http_headers structure in this use case. The gst_curl_http_src_negotiate_caps() function extracts the "response-headers" field from the http_headers, but did not check that this field might be NULL. If the user-agent property is set, the global user-agent string was freed. This caused a double-free error if the user-agent is ever set a second time during the execution of the process. There are situations within curlhttpsrc where the code needs both the global multi_task_context mutex and the per-element buffer_mutex. To avoid deadlocks, it is vital that the order in which these are requested is always the same. This commit modifies the locking order to always be in the order: 1. multi_task_context.task_rec_mutex 2. buffer_mutex Fixes #876
2019-02-05 16:34:40 +00:00
g_mutex_unlock (&source->uri_mutex);
curl: Add curlhttpsrc element Merged from https://github.com/bbc/gst-curlhttpsrc commit f8aabcfc5c50a44f3362de831377d6e86dcd2d49 https://bugzilla.gnome.org/show_bug.cgi?id=744261
2017-07-25 14:23:57 +00:00
break;
case PROP_USERNAME:
curlhttpsrc: do not check for NULL before g_free() g_free() is NULL-safe.
2017-07-26 23:51:50 +00:00
g_free (source->username);
curl: Add curlhttpsrc element Merged from https://github.com/bbc/gst-curlhttpsrc commit f8aabcfc5c50a44f3362de831377d6e86dcd2d49 https://bugzilla.gnome.org/show_bug.cgi?id=744261
2017-07-25 14:23:57 +00:00
source->username = g_value_dup_string (value);
break;
case PROP_PASSWORD:
curlhttpsrc: do not check for NULL before g_free() g_free() is NULL-safe.
2017-07-26 23:51:50 +00:00
g_free (source->password);
curl: Add curlhttpsrc element Merged from https://github.com/bbc/gst-curlhttpsrc commit f8aabcfc5c50a44f3362de831377d6e86dcd2d49 https://bugzilla.gnome.org/show_bug.cgi?id=744261
2017-07-25 14:23:57 +00:00
source->password = g_value_dup_string (value);
break;
case PROP_PROXYURI:
curlhttpsrc: do not check for NULL before g_free() g_free() is NULL-safe.
2017-07-26 23:51:50 +00:00
g_free (source->proxy_uri);
curl: Add curlhttpsrc element Merged from https://github.com/bbc/gst-curlhttpsrc commit f8aabcfc5c50a44f3362de831377d6e86dcd2d49 https://bugzilla.gnome.org/show_bug.cgi?id=744261
2017-07-25 14:23:57 +00:00
source->proxy_uri = g_value_dup_string (value);
break;
case PROP_PROXYUSERNAME:
curlhttpsrc: do not check for NULL before g_free() g_free() is NULL-safe.
2017-07-26 23:51:50 +00:00
g_free (source->proxy_user);
curl: Add curlhttpsrc element Merged from https://github.com/bbc/gst-curlhttpsrc commit f8aabcfc5c50a44f3362de831377d6e86dcd2d49 https://bugzilla.gnome.org/show_bug.cgi?id=744261
2017-07-25 14:23:57 +00:00
source->proxy_user = g_value_dup_string (value);
break;
case PROP_PROXYPASSWORD:
curlhttpsrc: do not check for NULL before g_free() g_free() is NULL-safe.
2017-07-26 23:51:50 +00:00
g_free (source->proxy_pass);
curl: Add curlhttpsrc element Merged from https://github.com/bbc/gst-curlhttpsrc commit f8aabcfc5c50a44f3362de831377d6e86dcd2d49 https://bugzilla.gnome.org/show_bug.cgi?id=744261
2017-07-25 14:23:57 +00:00
source->proxy_pass = g_value_dup_string (value);
break;
case PROP_COOKIES:
g_strfreev (source->cookies);
source->cookies = g_strdupv (g_value_get_boxed (value));
source->number_cookies = g_strv_length (source->cookies);
break;
case PROP_USERAGENT:
curlhttpsrc: do not check for NULL before g_free() g_free() is NULL-safe.
2017-07-26 23:51:50 +00:00
g_free (source->user_agent);
curl: Add curlhttpsrc element Merged from https://github.com/bbc/gst-curlhttpsrc commit f8aabcfc5c50a44f3362de831377d6e86dcd2d49 https://bugzilla.gnome.org/show_bug.cgi?id=744261
2017-07-25 14:23:57 +00:00
source->user_agent = g_value_dup_string (value);
break;
case PROP_HEADERS:
{
const GstStructure *s = gst_value_get_structure (value);
if (source->request_headers)
gst_structure_free (source->request_headers);
curlhttpsrc: fix various leaks and thread safety issues curlhttpsrc uses a single thread running the gst_curl_http_src_curl_multi_loop() function to handle receiving data and messages from libcurl. Each instance of curlhttpsrc adds an entry into a queue in GstCurlHttpSrcMultiTaskContext and waits for the multi_loop to perform the HTTP request. Valgrind has shown up race conditions and memory leaks: 1. gst_curl_http_src_change_state() does not wait for the multi_loop to complete before going to the NULL state, which means that an instance of GstCurlHttpSrc can be released while gst_curl_http_src_curl_multi_loop() still has a reference to it. 2. if multiple elements try to be removed from the queue at once, only the last one is deleted. 3. source->caps is leaked 4. curl multi_handle is leaked 5. leak of curl_handle if URI not set 6. leak of http_headers when reusing element 7. null pointer dereference in negotiate caps 8. double-free of the default user-agent string 9. leak of multi_task_context.task This commit changes the logic so that each element has a connection status, which is used by the multi_loop to decide when to remove an element from its queue. An instance of curlhttpsrc will not enter the NULL state until its reference has been removed from the queue. When shutting down the curl multi loop, the memory allocated from the call to curl_multi_init() is now released. When gstadaptivedemux uses a URI source element, it will re-use it for multiple requests, moving it between READY and PLAYING between each request. curlhttpsrc was leaking the http_headers structure in this use case. The gst_curl_http_src_negotiate_caps() function extracts the "response-headers" field from the http_headers, but did not check that this field might be NULL. If the user-agent property is set, the global user-agent string was freed. This caused a double-free error if the user-agent is ever set a second time during the execution of the process. There are situations within curlhttpsrc where the code needs both the global multi_task_context mutex and the per-element buffer_mutex. To avoid deadlocks, it is vital that the order in which these are requested is always the same. This commit modifies the locking order to always be in the order: 1. multi_task_context.task_rec_mutex 2. buffer_mutex Fixes #876
2019-02-05 16:34:40 +00:00
source->request_headers =
s ? gst_structure_copy (s) :
gst_structure_new_empty (REQUEST_HEADERS_NAME);
curl: Add curlhttpsrc element Merged from https://github.com/bbc/gst-curlhttpsrc commit f8aabcfc5c50a44f3362de831377d6e86dcd2d49 https://bugzilla.gnome.org/show_bug.cgi?id=744261
2017-07-25 14:23:57 +00:00
}
break;
case PROP_COMPRESS:
source->accept_compressed_encodings = g_value_get_boolean (value);
break;
case PROP_REDIRECT:
source->allow_3xx_redirect = g_value_get_boolean (value);
break;
case PROP_MAXREDIRECT:
source->max_3xx_redirects = g_value_get_int (value);
break;
case PROP_KEEPALIVE:
source->keep_alive = g_value_get_boolean (value);
break;
case PROP_TIMEOUT:
source->timeout_secs = g_value_get_int (value);
break;
case PROP_STRICT_SSL:
source->strict_ssl = g_value_get_boolean (value);
break;
case PROP_SSL_CA_FILE:
source->custom_ca_file = g_value_dup_string (value);
break;
case PROP_RETRIES:
source->total_retries = g_value_get_int (value);
break;
case PROP_CONNECTIONMAXTIME:
source->max_connection_time = g_value_get_uint (value);
break;
case PROP_MAXCONCURRENT_SERVER:
source->max_conns_per_server = g_value_get_uint (value);
break;
case PROP_MAXCONCURRENT_PROXY:
source->max_conns_per_proxy = g_value_get_uint (value);
break;
case PROP_MAXCONCURRENT_GLOBAL:
source->max_conns_global = g_value_get_uint (value);
break;
case PROP_HTTPVERSION:
curlhttpsrc: set http-version class property as enum This matches better with the preferred_http_version which was already declared as enum. https://bugzilla.gnome.org/show_bug.cgi?id=785878
2017-08-07 09:25:17 +00:00
source->preferred_http_version = g_value_get_enum (value);
curl: Add curlhttpsrc element Merged from https://github.com/bbc/gst-curlhttpsrc commit f8aabcfc5c50a44f3362de831377d6e86dcd2d49 https://bugzilla.gnome.org/show_bug.cgi?id=744261
2017-07-25 14:23:57 +00:00
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
GSTCURL_FUNCTION_EXIT (source);
}
static void
gst_curl_http_src_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec)
{
GstCurlHttpSrc *source = GST_CURLHTTPSRC (object);
GSTCURL_FUNCTION_ENTRY (source);
switch (prop_id) {
case PROP_URI:
curlhttpsrc: fix various leaks and thread safety issues curlhttpsrc uses a single thread running the gst_curl_http_src_curl_multi_loop() function to handle receiving data and messages from libcurl. Each instance of curlhttpsrc adds an entry into a queue in GstCurlHttpSrcMultiTaskContext and waits for the multi_loop to perform the HTTP request. Valgrind has shown up race conditions and memory leaks: 1. gst_curl_http_src_change_state() does not wait for the multi_loop to complete before going to the NULL state, which means that an instance of GstCurlHttpSrc can be released while gst_curl_http_src_curl_multi_loop() still has a reference to it. 2. if multiple elements try to be removed from the queue at once, only the last one is deleted. 3. source->caps is leaked 4. curl multi_handle is leaked 5. leak of curl_handle if URI not set 6. leak of http_headers when reusing element 7. null pointer dereference in negotiate caps 8. double-free of the default user-agent string 9. leak of multi_task_context.task This commit changes the logic so that each element has a connection status, which is used by the multi_loop to decide when to remove an element from its queue. An instance of curlhttpsrc will not enter the NULL state until its reference has been removed from the queue. When shutting down the curl multi loop, the memory allocated from the call to curl_multi_init() is now released. When gstadaptivedemux uses a URI source element, it will re-use it for multiple requests, moving it between READY and PLAYING between each request. curlhttpsrc was leaking the http_headers structure in this use case. The gst_curl_http_src_negotiate_caps() function extracts the "response-headers" field from the http_headers, but did not check that this field might be NULL. If the user-agent property is set, the global user-agent string was freed. This caused a double-free error if the user-agent is ever set a second time during the execution of the process. There are situations within curlhttpsrc where the code needs both the global multi_task_context mutex and the per-element buffer_mutex. To avoid deadlocks, it is vital that the order in which these are requested is always the same. This commit modifies the locking order to always be in the order: 1. multi_task_context.task_rec_mutex 2. buffer_mutex Fixes #876
2019-02-05 16:34:40 +00:00
g_mutex_lock (&source->uri_mutex);
curl: Add curlhttpsrc element Merged from https://github.com/bbc/gst-curlhttpsrc commit f8aabcfc5c50a44f3362de831377d6e86dcd2d49 https://bugzilla.gnome.org/show_bug.cgi?id=744261
2017-07-25 14:23:57 +00:00
g_value_set_string (value, source->uri);
curlhttpsrc: fix various leaks and thread safety issues curlhttpsrc uses a single thread running the gst_curl_http_src_curl_multi_loop() function to handle receiving data and messages from libcurl. Each instance of curlhttpsrc adds an entry into a queue in GstCurlHttpSrcMultiTaskContext and waits for the multi_loop to perform the HTTP request. Valgrind has shown up race conditions and memory leaks: 1. gst_curl_http_src_change_state() does not wait for the multi_loop to complete before going to the NULL state, which means that an instance of GstCurlHttpSrc can be released while gst_curl_http_src_curl_multi_loop() still has a reference to it. 2. if multiple elements try to be removed from the queue at once, only the last one is deleted. 3. source->caps is leaked 4. curl multi_handle is leaked 5. leak of curl_handle if URI not set 6. leak of http_headers when reusing element 7. null pointer dereference in negotiate caps 8. double-free of the default user-agent string 9. leak of multi_task_context.task This commit changes the logic so that each element has a connection status, which is used by the multi_loop to decide when to remove an element from its queue. An instance of curlhttpsrc will not enter the NULL state until its reference has been removed from the queue. When shutting down the curl multi loop, the memory allocated from the call to curl_multi_init() is now released. When gstadaptivedemux uses a URI source element, it will re-use it for multiple requests, moving it between READY and PLAYING between each request. curlhttpsrc was leaking the http_headers structure in this use case. The gst_curl_http_src_negotiate_caps() function extracts the "response-headers" field from the http_headers, but did not check that this field might be NULL. If the user-agent property is set, the global user-agent string was freed. This caused a double-free error if the user-agent is ever set a second time during the execution of the process. There are situations within curlhttpsrc where the code needs both the global multi_task_context mutex and the per-element buffer_mutex. To avoid deadlocks, it is vital that the order in which these are requested is always the same. This commit modifies the locking order to always be in the order: 1. multi_task_context.task_rec_mutex 2. buffer_mutex Fixes #876
2019-02-05 16:34:40 +00:00
g_mutex_unlock (&source->uri_mutex);
curl: Add curlhttpsrc element Merged from https://github.com/bbc/gst-curlhttpsrc commit f8aabcfc5c50a44f3362de831377d6e86dcd2d49 https://bugzilla.gnome.org/show_bug.cgi?id=744261
2017-07-25 14:23:57 +00:00
break;
case PROP_USERNAME:
g_value_set_string (value, source->username);
break;
case PROP_PASSWORD:
g_value_set_string (value, source->password);
break;
case PROP_PROXYURI:
g_value_set_string (value, source->proxy_uri);
break;
case PROP_PROXYUSERNAME:
g_value_set_string (value, source->proxy_user);
break;
case PROP_PROXYPASSWORD:
g_value_set_string (value, source->proxy_pass);
break;
case PROP_COOKIES:
g_value_set_boxed (value, source->cookies);
break;
case PROP_USERAGENT:
g_value_set_string (value, source->user_agent);
break;
case PROP_HEADERS:
gst_value_set_structure (value, source->request_headers);
break;
case PROP_COMPRESS:
g_value_set_boolean (value, source->accept_compressed_encodings);
break;
case PROP_REDIRECT:
g_value_set_boolean (value, source->allow_3xx_redirect);
break;
case PROP_MAXREDIRECT:
g_value_set_int (value, source->max_3xx_redirects);
break;
case PROP_KEEPALIVE:
g_value_set_boolean (value, source->keep_alive);
break;
case PROP_TIMEOUT:
g_value_set_int (value, source->timeout_secs);
break;
case PROP_STRICT_SSL:
g_value_set_boolean (value, source->strict_ssl);
break;
case PROP_SSL_CA_FILE:
g_value_set_string (value, source->custom_ca_file);
break;
case PROP_RETRIES:
g_value_set_int (value, source->total_retries);
break;
case PROP_CONNECTIONMAXTIME:
g_value_set_uint (value, source->max_connection_time);
break;
case PROP_MAXCONCURRENT_SERVER:
g_value_set_uint (value, source->max_conns_per_server);
break;
case PROP_MAXCONCURRENT_PROXY:
g_value_set_uint (value, source->max_conns_per_proxy);
break;
case PROP_MAXCONCURRENT_GLOBAL:
g_value_set_uint (value, source->max_conns_global);
break;
case PROP_HTTPVERSION:
curlhttpsrc: set http-version class property as enum This matches better with the preferred_http_version which was already declared as enum. https://bugzilla.gnome.org/show_bug.cgi?id=785878
2017-08-07 09:25:17 +00:00
g_value_set_enum (value, source->preferred_http_version);
curl: Add curlhttpsrc element Merged from https://github.com/bbc/gst-curlhttpsrc commit f8aabcfc5c50a44f3362de831377d6e86dcd2d49 https://bugzilla.gnome.org/show_bug.cgi?id=744261
2017-07-25 14:23:57 +00:00
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
GSTCURL_FUNCTION_EXIT (source);
}
static void
gst_curl_http_src_init (GstCurlHttpSrc * source)
{
GSTCURL_FUNCTION_ENTRY (source);
/* Assume everything is already free'd */
source->uri = NULL;
source->redirect_uri = NULL;
source->username = GSTCURL_HANDLE_DEFAULT_CURLOPT_USERNAME;
source->password = GSTCURL_HANDLE_DEFAULT_CURLOPT_PASSWORD;
source->proxy_uri = NULL;
source->proxy_user = NULL;
source->proxy_pass = NULL;
source->cookies = NULL;
curlhttpsrc: fix various leaks and thread safety issues curlhttpsrc uses a single thread running the gst_curl_http_src_curl_multi_loop() function to handle receiving data and messages from libcurl. Each instance of curlhttpsrc adds an entry into a queue in GstCurlHttpSrcMultiTaskContext and waits for the multi_loop to perform the HTTP request. Valgrind has shown up race conditions and memory leaks: 1. gst_curl_http_src_change_state() does not wait for the multi_loop to complete before going to the NULL state, which means that an instance of GstCurlHttpSrc can be released while gst_curl_http_src_curl_multi_loop() still has a reference to it. 2. if multiple elements try to be removed from the queue at once, only the last one is deleted. 3. source->caps is leaked 4. curl multi_handle is leaked 5. leak of curl_handle if URI not set 6. leak of http_headers when reusing element 7. null pointer dereference in negotiate caps 8. double-free of the default user-agent string 9. leak of multi_task_context.task This commit changes the logic so that each element has a connection status, which is used by the multi_loop to decide when to remove an element from its queue. An instance of curlhttpsrc will not enter the NULL state until its reference has been removed from the queue. When shutting down the curl multi loop, the memory allocated from the call to curl_multi_init() is now released. When gstadaptivedemux uses a URI source element, it will re-use it for multiple requests, moving it between READY and PLAYING between each request. curlhttpsrc was leaking the http_headers structure in this use case. The gst_curl_http_src_negotiate_caps() function extracts the "response-headers" field from the http_headers, but did not check that this field might be NULL. If the user-agent property is set, the global user-agent string was freed. This caused a double-free error if the user-agent is ever set a second time during the execution of the process. There are situations within curlhttpsrc where the code needs both the global multi_task_context mutex and the per-element buffer_mutex. To avoid deadlocks, it is vital that the order in which these are requested is always the same. This commit modifies the locking order to always be in the order: 1. multi_task_context.task_rec_mutex 2. buffer_mutex Fixes #876
2019-02-05 16:34:40 +00:00
g_assert (gst_curl_http_src_curl_capabilities != NULL);
source->user_agent =
g_strdup_printf (GSTCURL_HANDLE_DEFAULT_CURLOPT_USERAGENT "/%s",
gst_curl_http_src_curl_capabilities->version);
curl: Add curlhttpsrc element Merged from https://github.com/bbc/gst-curlhttpsrc commit f8aabcfc5c50a44f3362de831377d6e86dcd2d49 https://bugzilla.gnome.org/show_bug.cgi?id=744261
2017-07-25 14:23:57 +00:00
source->number_cookies = 0;
curlhttpsrc: fix various leaks and thread safety issues curlhttpsrc uses a single thread running the gst_curl_http_src_curl_multi_loop() function to handle receiving data and messages from libcurl. Each instance of curlhttpsrc adds an entry into a queue in GstCurlHttpSrcMultiTaskContext and waits for the multi_loop to perform the HTTP request. Valgrind has shown up race conditions and memory leaks: 1. gst_curl_http_src_change_state() does not wait for the multi_loop to complete before going to the NULL state, which means that an instance of GstCurlHttpSrc can be released while gst_curl_http_src_curl_multi_loop() still has a reference to it. 2. if multiple elements try to be removed from the queue at once, only the last one is deleted. 3. source->caps is leaked 4. curl multi_handle is leaked 5. leak of curl_handle if URI not set 6. leak of http_headers when reusing element 7. null pointer dereference in negotiate caps 8. double-free of the default user-agent string 9. leak of multi_task_context.task This commit changes the logic so that each element has a connection status, which is used by the multi_loop to decide when to remove an element from its queue. An instance of curlhttpsrc will not enter the NULL state until its reference has been removed from the queue. When shutting down the curl multi loop, the memory allocated from the call to curl_multi_init() is now released. When gstadaptivedemux uses a URI source element, it will re-use it for multiple requests, moving it between READY and PLAYING between each request. curlhttpsrc was leaking the http_headers structure in this use case. The gst_curl_http_src_negotiate_caps() function extracts the "response-headers" field from the http_headers, but did not check that this field might be NULL. If the user-agent property is set, the global user-agent string was freed. This caused a double-free error if the user-agent is ever set a second time during the execution of the process. There are situations within curlhttpsrc where the code needs both the global multi_task_context mutex and the per-element buffer_mutex. To avoid deadlocks, it is vital that the order in which these are requested is always the same. This commit modifies the locking order to always be in the order: 1. multi_task_context.task_rec_mutex 2. buffer_mutex Fixes #876
2019-02-05 16:34:40 +00:00
source->request_headers = gst_structure_new_empty (REQUEST_HEADERS_NAME);
curl: Add curlhttpsrc element Merged from https://github.com/bbc/gst-curlhttpsrc commit f8aabcfc5c50a44f3362de831377d6e86dcd2d49 https://bugzilla.gnome.org/show_bug.cgi?id=744261
2017-07-25 14:23:57 +00:00
source->allow_3xx_redirect = GSTCURL_HANDLE_DEFAULT_CURLOPT_FOLLOWLOCATION;
source->max_3xx_redirects = GSTCURL_HANDLE_DEFAULT_CURLOPT_MAXREDIRS;
source->keep_alive = GSTCURL_HANDLE_DEFAULT_CURLOPT_TCP_KEEPALIVE;
source->timeout_secs = GSTCURL_HANDLE_DEFAULT_CURLOPT_TIMEOUT;
source->max_connection_time = GSTCURL_DEFAULT_CONNECTION_TIME;
source->max_conns_per_server = GSTCURL_DEFAULT_CONNECTIONS_SERVER;
source->max_conns_per_proxy = GSTCURL_DEFAULT_CONNECTIONS_PROXY;
source->max_conns_global = GSTCURL_DEFAULT_CONNECTIONS_GLOBAL;
source->strict_ssl = GSTCURL_HANDLE_DEFAULT_CURLOPT_SSL_VERIFYPEER;
source->custom_ca_file = NULL;
source->preferred_http_version = pref_http_ver;
source->total_retries = GSTCURL_HANDLE_DEFAULT_RETRIES;
source->retries_remaining = source->total_retries;
source->slist = NULL;
curlhttpsrc: fix various leaks and thread safety issues curlhttpsrc uses a single thread running the gst_curl_http_src_curl_multi_loop() function to handle receiving data and messages from libcurl. Each instance of curlhttpsrc adds an entry into a queue in GstCurlHttpSrcMultiTaskContext and waits for the multi_loop to perform the HTTP request. Valgrind has shown up race conditions and memory leaks: 1. gst_curl_http_src_change_state() does not wait for the multi_loop to complete before going to the NULL state, which means that an instance of GstCurlHttpSrc can be released while gst_curl_http_src_curl_multi_loop() still has a reference to it. 2. if multiple elements try to be removed from the queue at once, only the last one is deleted. 3. source->caps is leaked 4. curl multi_handle is leaked 5. leak of curl_handle if URI not set 6. leak of http_headers when reusing element 7. null pointer dereference in negotiate caps 8. double-free of the default user-agent string 9. leak of multi_task_context.task This commit changes the logic so that each element has a connection status, which is used by the multi_loop to decide when to remove an element from its queue. An instance of curlhttpsrc will not enter the NULL state until its reference has been removed from the queue. When shutting down the curl multi loop, the memory allocated from the call to curl_multi_init() is now released. When gstadaptivedemux uses a URI source element, it will re-use it for multiple requests, moving it between READY and PLAYING between each request. curlhttpsrc was leaking the http_headers structure in this use case. The gst_curl_http_src_negotiate_caps() function extracts the "response-headers" field from the http_headers, but did not check that this field might be NULL. If the user-agent property is set, the global user-agent string was freed. This caused a double-free error if the user-agent is ever set a second time during the execution of the process. There are situations within curlhttpsrc where the code needs both the global multi_task_context mutex and the per-element buffer_mutex. To avoid deadlocks, it is vital that the order in which these are requested is always the same. This commit modifies the locking order to always be in the order: 1. multi_task_context.task_rec_mutex 2. buffer_mutex Fixes #876
2019-02-05 16:34:40 +00:00
source->accept_compressed_encodings = FALSE;
curlhttpsrc: add support for range GET To allow curlhttpsrc to support DASH streams that use the on-demand profile, it needs to support HTTP Range GETs. In GStreamer, the RANGE is specified by issuing a GST_FORMAT_BYTES seek to set the start and end of the range. curlhttpsrc needs to implement seek and set the appropriate curl options to make it add the Range header to the request.
2019-05-24 16:33:33 +00:00
source->seekable = GSTCURL_SEEKABLE_UNKNOWN;
source->content_size = 0;
source->request_position = 0;
source->stop_position = -1;
curl: Add curlhttpsrc element Merged from https://github.com/bbc/gst-curlhttpsrc commit f8aabcfc5c50a44f3362de831377d6e86dcd2d49 https://bugzilla.gnome.org/show_bug.cgi?id=744261
2017-07-25 14:23:57 +00:00
gst_base_src_set_automatic_eos (GST_BASE_SRC (source), FALSE);
source->proxy_uri = g_strdup (g_getenv ("http_proxy"));
source->no_proxy_list = g_strdup (g_getenv ("no_proxy"));
g_mutex_init (&source->uri_mutex);
g_mutex_init (&source->buffer_mutex);
curlhttpsrc: fix various leaks and thread safety issues curlhttpsrc uses a single thread running the gst_curl_http_src_curl_multi_loop() function to handle receiving data and messages from libcurl. Each instance of curlhttpsrc adds an entry into a queue in GstCurlHttpSrcMultiTaskContext and waits for the multi_loop to perform the HTTP request. Valgrind has shown up race conditions and memory leaks: 1. gst_curl_http_src_change_state() does not wait for the multi_loop to complete before going to the NULL state, which means that an instance of GstCurlHttpSrc can be released while gst_curl_http_src_curl_multi_loop() still has a reference to it. 2. if multiple elements try to be removed from the queue at once, only the last one is deleted. 3. source->caps is leaked 4. curl multi_handle is leaked 5. leak of curl_handle if URI not set 6. leak of http_headers when reusing element 7. null pointer dereference in negotiate caps 8. double-free of the default user-agent string 9. leak of multi_task_context.task This commit changes the logic so that each element has a connection status, which is used by the multi_loop to decide when to remove an element from its queue. An instance of curlhttpsrc will not enter the NULL state until its reference has been removed from the queue. When shutting down the curl multi loop, the memory allocated from the call to curl_multi_init() is now released. When gstadaptivedemux uses a URI source element, it will re-use it for multiple requests, moving it between READY and PLAYING between each request. curlhttpsrc was leaking the http_headers structure in this use case. The gst_curl_http_src_negotiate_caps() function extracts the "response-headers" field from the http_headers, but did not check that this field might be NULL. If the user-agent property is set, the global user-agent string was freed. This caused a double-free error if the user-agent is ever set a second time during the execution of the process. There are situations within curlhttpsrc where the code needs both the global multi_task_context mutex and the per-element buffer_mutex. To avoid deadlocks, it is vital that the order in which these are requested is always the same. This commit modifies the locking order to always be in the order: 1. multi_task_context.task_rec_mutex 2. buffer_mutex Fixes #876
2019-02-05 16:34:40 +00:00
g_cond_init (&source->buffer_cond);
curl: Add curlhttpsrc element Merged from https://github.com/bbc/gst-curlhttpsrc commit f8aabcfc5c50a44f3362de831377d6e86dcd2d49 https://bugzilla.gnome.org/show_bug.cgi?id=744261
2017-07-25 14:23:57 +00:00
source->buffer = NULL;
source->buffer_len = 0;
source->state = GSTCURL_NONE;
source->pending_state = GSTCURL_NONE;
curlhttpsrc: fix various leaks and thread safety issues curlhttpsrc uses a single thread running the gst_curl_http_src_curl_multi_loop() function to handle receiving data and messages from libcurl. Each instance of curlhttpsrc adds an entry into a queue in GstCurlHttpSrcMultiTaskContext and waits for the multi_loop to perform the HTTP request. Valgrind has shown up race conditions and memory leaks: 1. gst_curl_http_src_change_state() does not wait for the multi_loop to complete before going to the NULL state, which means that an instance of GstCurlHttpSrc can be released while gst_curl_http_src_curl_multi_loop() still has a reference to it. 2. if multiple elements try to be removed from the queue at once, only the last one is deleted. 3. source->caps is leaked 4. curl multi_handle is leaked 5. leak of curl_handle if URI not set 6. leak of http_headers when reusing element 7. null pointer dereference in negotiate caps 8. double-free of the default user-agent string 9. leak of multi_task_context.task This commit changes the logic so that each element has a connection status, which is used by the multi_loop to decide when to remove an element from its queue. An instance of curlhttpsrc will not enter the NULL state until its reference has been removed from the queue. When shutting down the curl multi loop, the memory allocated from the call to curl_multi_init() is now released. When gstadaptivedemux uses a URI source element, it will re-use it for multiple requests, moving it between READY and PLAYING between each request. curlhttpsrc was leaking the http_headers structure in this use case. The gst_curl_http_src_negotiate_caps() function extracts the "response-headers" field from the http_headers, but did not check that this field might be NULL. If the user-agent property is set, the global user-agent string was freed. This caused a double-free error if the user-agent is ever set a second time during the execution of the process. There are situations within curlhttpsrc where the code needs both the global multi_task_context mutex and the per-element buffer_mutex. To avoid deadlocks, it is vital that the order in which these are requested is always the same. This commit modifies the locking order to always be in the order: 1. multi_task_context.task_rec_mutex 2. buffer_mutex Fixes #876
2019-02-05 16:34:40 +00:00
source->transfer_begun = FALSE;
source->data_received = FALSE;
source->connection_status = GSTCURL_NOT_CONNECTED;
curl: Add curlhttpsrc element Merged from https://github.com/bbc/gst-curlhttpsrc commit f8aabcfc5c50a44f3362de831377d6e86dcd2d49 https://bugzilla.gnome.org/show_bug.cgi?id=744261
2017-07-25 14:23:57 +00:00
source->http_headers = NULL;
curlhttpsrc: fix various leaks and thread safety issues curlhttpsrc uses a single thread running the gst_curl_http_src_curl_multi_loop() function to handle receiving data and messages from libcurl. Each instance of curlhttpsrc adds an entry into a queue in GstCurlHttpSrcMultiTaskContext and waits for the multi_loop to perform the HTTP request. Valgrind has shown up race conditions and memory leaks: 1. gst_curl_http_src_change_state() does not wait for the multi_loop to complete before going to the NULL state, which means that an instance of GstCurlHttpSrc can be released while gst_curl_http_src_curl_multi_loop() still has a reference to it. 2. if multiple elements try to be removed from the queue at once, only the last one is deleted. 3. source->caps is leaked 4. curl multi_handle is leaked 5. leak of curl_handle if URI not set 6. leak of http_headers when reusing element 7. null pointer dereference in negotiate caps 8. double-free of the default user-agent string 9. leak of multi_task_context.task This commit changes the logic so that each element has a connection status, which is used by the multi_loop to decide when to remove an element from its queue. An instance of curlhttpsrc will not enter the NULL state until its reference has been removed from the queue. When shutting down the curl multi loop, the memory allocated from the call to curl_multi_init() is now released. When gstadaptivedemux uses a URI source element, it will re-use it for multiple requests, moving it between READY and PLAYING between each request. curlhttpsrc was leaking the http_headers structure in this use case. The gst_curl_http_src_negotiate_caps() function extracts the "response-headers" field from the http_headers, but did not check that this field might be NULL. If the user-agent property is set, the global user-agent string was freed. This caused a double-free error if the user-agent is ever set a second time during the execution of the process. There are situations within curlhttpsrc where the code needs both the global multi_task_context mutex and the per-element buffer_mutex. To avoid deadlocks, it is vital that the order in which these are requested is always the same. This commit modifies the locking order to always be in the order: 1. multi_task_context.task_rec_mutex 2. buffer_mutex Fixes #876
2019-02-05 16:34:40 +00:00
source->content_type = NULL;
source->status_code = 0;
curlhttpsrc: export same HTTP error status as souphttpsrc To make it closer to a drop-in replacement for souphttpsrc, expose the same gst_error_message_with_details as souphttpsrc, so that applications can received the HTTP status code and reason when an error occurs.
2019-02-05 17:06:50 +00:00
source->reason_phrase = NULL;
curl: Add curlhttpsrc element Merged from https://github.com/bbc/gst-curlhttpsrc commit f8aabcfc5c50a44f3362de831377d6e86dcd2d49 https://bugzilla.gnome.org/show_bug.cgi?id=744261
2017-07-25 14:23:57 +00:00
source->hdrs_updated = FALSE;
source->curl_result = CURLE_OK;
curlhttpsrc: fix various leaks and thread safety issues curlhttpsrc uses a single thread running the gst_curl_http_src_curl_multi_loop() function to handle receiving data and messages from libcurl. Each instance of curlhttpsrc adds an entry into a queue in GstCurlHttpSrcMultiTaskContext and waits for the multi_loop to perform the HTTP request. Valgrind has shown up race conditions and memory leaks: 1. gst_curl_http_src_change_state() does not wait for the multi_loop to complete before going to the NULL state, which means that an instance of GstCurlHttpSrc can be released while gst_curl_http_src_curl_multi_loop() still has a reference to it. 2. if multiple elements try to be removed from the queue at once, only the last one is deleted. 3. source->caps is leaked 4. curl multi_handle is leaked 5. leak of curl_handle if URI not set 6. leak of http_headers when reusing element 7. null pointer dereference in negotiate caps 8. double-free of the default user-agent string 9. leak of multi_task_context.task This commit changes the logic so that each element has a connection status, which is used by the multi_loop to decide when to remove an element from its queue. An instance of curlhttpsrc will not enter the NULL state until its reference has been removed from the queue. When shutting down the curl multi loop, the memory allocated from the call to curl_multi_init() is now released. When gstadaptivedemux uses a URI source element, it will re-use it for multiple requests, moving it between READY and PLAYING between each request. curlhttpsrc was leaking the http_headers structure in this use case. The gst_curl_http_src_negotiate_caps() function extracts the "response-headers" field from the http_headers, but did not check that this field might be NULL. If the user-agent property is set, the global user-agent string was freed. This caused a double-free error if the user-agent is ever set a second time during the execution of the process. There are situations within curlhttpsrc where the code needs both the global multi_task_context mutex and the per-element buffer_mutex. To avoid deadlocks, it is vital that the order in which these are requested is always the same. This commit modifies the locking order to always be in the order: 1. multi_task_context.task_rec_mutex 2. buffer_mutex Fixes #876
2019-02-05 16:34:40 +00:00
gst_caps_replace (&source->caps, NULL);
curl: Add curlhttpsrc element Merged from https://github.com/bbc/gst-curlhttpsrc commit f8aabcfc5c50a44f3362de831377d6e86dcd2d49 https://bugzilla.gnome.org/show_bug.cgi?id=744261
2017-07-25 14:23:57 +00:00
GSTCURL_FUNCTION_EXIT (source);
}
/*
* Check if the Curl multi loop has been started. If not, initialise it and
* start it running. If it is already running, increment the refcount.
*/
static void
gst_curl_http_src_ref_multi (GstCurlHttpSrc * src)
{
GstCurlHttpSrcClass *klass;
GSTCURL_FUNCTION_ENTRY (src);
/*klass = (GstCurlHttpSrcClass) g_type_class_peek_parent (src); */
klass = G_TYPE_INSTANCE_GET_CLASS (src, GST_TYPE_CURL_HTTP_SRC,
GstCurlHttpSrcClass);
g_mutex_lock (&klass->multi_task_context.mutex);
if (klass->multi_task_context.refcount == 0) {
/* Set up various in-task properties */
/* NULL is treated as the start of the list, no need to allocate. */
klass->multi_task_context.queue = NULL;
/* set up curl */
klass->multi_task_context.multi_handle = curl_multi_init ();
curl_multi_setopt (klass->multi_task_context.multi_handle,
CURLMOPT_PIPELINING, 1);
#ifdef CURLMOPT_MAX_HOST_CONNECTIONS
curl_multi_setopt (klass->multi_task_context.multi_handle,
CURLMOPT_MAX_HOST_CONNECTIONS, 1);
#endif
/* Start the thread */
curlhttpsrc: fix various leaks and thread safety issues curlhttpsrc uses a single thread running the gst_curl_http_src_curl_multi_loop() function to handle receiving data and messages from libcurl. Each instance of curlhttpsrc adds an entry into a queue in GstCurlHttpSrcMultiTaskContext and waits for the multi_loop to perform the HTTP request. Valgrind has shown up race conditions and memory leaks: 1. gst_curl_http_src_change_state() does not wait for the multi_loop to complete before going to the NULL state, which means that an instance of GstCurlHttpSrc can be released while gst_curl_http_src_curl_multi_loop() still has a reference to it. 2. if multiple elements try to be removed from the queue at once, only the last one is deleted. 3. source->caps is leaked 4. curl multi_handle is leaked 5. leak of curl_handle if URI not set 6. leak of http_headers when reusing element 7. null pointer dereference in negotiate caps 8. double-free of the default user-agent string 9. leak of multi_task_context.task This commit changes the logic so that each element has a connection status, which is used by the multi_loop to decide when to remove an element from its queue. An instance of curlhttpsrc will not enter the NULL state until its reference has been removed from the queue. When shutting down the curl multi loop, the memory allocated from the call to curl_multi_init() is now released. When gstadaptivedemux uses a URI source element, it will re-use it for multiple requests, moving it between READY and PLAYING between each request. curlhttpsrc was leaking the http_headers structure in this use case. The gst_curl_http_src_negotiate_caps() function extracts the "response-headers" field from the http_headers, but did not check that this field might be NULL. If the user-agent property is set, the global user-agent string was freed. This caused a double-free error if the user-agent is ever set a second time during the execution of the process. There are situations within curlhttpsrc where the code needs both the global multi_task_context mutex and the per-element buffer_mutex. To avoid deadlocks, it is vital that the order in which these are requested is always the same. This commit modifies the locking order to always be in the order: 1. multi_task_context.task_rec_mutex 2. buffer_mutex Fixes #876
2019-02-05 16:34:40 +00:00
g_rec_mutex_init (&klass->multi_task_context.task_rec_mutex);
klass->multi_task_context.state = GSTCURL_MULTI_LOOP_STATE_RUNNING;
curl: Add curlhttpsrc element Merged from https://github.com/bbc/gst-curlhttpsrc commit f8aabcfc5c50a44f3362de831377d6e86dcd2d49 https://bugzilla.gnome.org/show_bug.cgi?id=744261
2017-07-25 14:23:57 +00:00
klass->multi_task_context.task = gst_task_new (
(GstTaskFunction) gst_curl_http_src_curl_multi_loop,
(gpointer) & klass->multi_task_context, NULL);
gst_task_set_lock (klass->multi_task_context.task,
&klass->multi_task_context.task_rec_mutex);
if (gst_task_start (klass->multi_task_context.task) == FALSE) {
/*
* This is a pretty critical failure and is not recoverable, so commit
* sudoku and run away.
*/
GSTCURL_ERROR_PRINT ("Couldn't start curl_multi task! Aborting.");
abort ();
}
GSTCURL_INFO_PRINT ("Curl multi loop has been correctly initialised!");
}
klass->multi_task_context.refcount++;
g_mutex_unlock (&klass->multi_task_context.mutex);
GSTCURL_FUNCTION_EXIT (src);
}
/*
* Decrement the reference count on the curl multi loop. If this is called by
* the last instance to hold a reference, shut down the worker. (Otherwise
* GStreamer can't close down with a thread still running). Also offers the
* "force_all" boolean parameter, which if TRUE removes all references and shuts
* down.
*/
static void
gst_curl_http_src_unref_multi (GstCurlHttpSrc * src)
{
GstCurlHttpSrcClass *klass;
GSTCURL_FUNCTION_ENTRY (src);
klass = G_TYPE_INSTANCE_GET_CLASS (src, GST_TYPE_CURL_HTTP_SRC,
GstCurlHttpSrcClass);
g_mutex_lock (&klass->multi_task_context.mutex);
klass->multi_task_context.refcount--;
GST_INFO_OBJECT (src, "Closing instance, worker thread refcount is now %u",
klass->multi_task_context.refcount);
curlhttpsrc: fix various leaks and thread safety issues curlhttpsrc uses a single thread running the gst_curl_http_src_curl_multi_loop() function to handle receiving data and messages from libcurl. Each instance of curlhttpsrc adds an entry into a queue in GstCurlHttpSrcMultiTaskContext and waits for the multi_loop to perform the HTTP request. Valgrind has shown up race conditions and memory leaks: 1. gst_curl_http_src_change_state() does not wait for the multi_loop to complete before going to the NULL state, which means that an instance of GstCurlHttpSrc can be released while gst_curl_http_src_curl_multi_loop() still has a reference to it. 2. if multiple elements try to be removed from the queue at once, only the last one is deleted. 3. source->caps is leaked 4. curl multi_handle is leaked 5. leak of curl_handle if URI not set 6. leak of http_headers when reusing element 7. null pointer dereference in negotiate caps 8. double-free of the default user-agent string 9. leak of multi_task_context.task This commit changes the logic so that each element has a connection status, which is used by the multi_loop to decide when to remove an element from its queue. An instance of curlhttpsrc will not enter the NULL state until its reference has been removed from the queue. When shutting down the curl multi loop, the memory allocated from the call to curl_multi_init() is now released. When gstadaptivedemux uses a URI source element, it will re-use it for multiple requests, moving it between READY and PLAYING between each request. curlhttpsrc was leaking the http_headers structure in this use case. The gst_curl_http_src_negotiate_caps() function extracts the "response-headers" field from the http_headers, but did not check that this field might be NULL. If the user-agent property is set, the global user-agent string was freed. This caused a double-free error if the user-agent is ever set a second time during the execution of the process. There are situations within curlhttpsrc where the code needs both the global multi_task_context mutex and the per-element buffer_mutex. To avoid deadlocks, it is vital that the order in which these are requested is always the same. This commit modifies the locking order to always be in the order: 1. multi_task_context.task_rec_mutex 2. buffer_mutex Fixes #876
2019-02-05 16:34:40 +00:00
if (klass->multi_task_context.refcount == 0) {
curl: Add curlhttpsrc element Merged from https://github.com/bbc/gst-curlhttpsrc commit f8aabcfc5c50a44f3362de831377d6e86dcd2d49 https://bugzilla.gnome.org/show_bug.cgi?id=744261
2017-07-25 14:23:57 +00:00
/* Everything's done! Clean up. */
curlhttpsrc: fix various leaks and thread safety issues curlhttpsrc uses a single thread running the gst_curl_http_src_curl_multi_loop() function to handle receiving data and messages from libcurl. Each instance of curlhttpsrc adds an entry into a queue in GstCurlHttpSrcMultiTaskContext and waits for the multi_loop to perform the HTTP request. Valgrind has shown up race conditions and memory leaks: 1. gst_curl_http_src_change_state() does not wait for the multi_loop to complete before going to the NULL state, which means that an instance of GstCurlHttpSrc can be released while gst_curl_http_src_curl_multi_loop() still has a reference to it. 2. if multiple elements try to be removed from the queue at once, only the last one is deleted. 3. source->caps is leaked 4. curl multi_handle is leaked 5. leak of curl_handle if URI not set 6. leak of http_headers when reusing element 7. null pointer dereference in negotiate caps 8. double-free of the default user-agent string 9. leak of multi_task_context.task This commit changes the logic so that each element has a connection status, which is used by the multi_loop to decide when to remove an element from its queue. An instance of curlhttpsrc will not enter the NULL state until its reference has been removed from the queue. When shutting down the curl multi loop, the memory allocated from the call to curl_multi_init() is now released. When gstadaptivedemux uses a URI source element, it will re-use it for multiple requests, moving it between READY and PLAYING between each request. curlhttpsrc was leaking the http_headers structure in this use case. The gst_curl_http_src_negotiate_caps() function extracts the "response-headers" field from the http_headers, but did not check that this field might be NULL. If the user-agent property is set, the global user-agent string was freed. This caused a double-free error if the user-agent is ever set a second time during the execution of the process. There are situations within curlhttpsrc where the code needs both the global multi_task_context mutex and the per-element buffer_mutex. To avoid deadlocks, it is vital that the order in which these are requested is always the same. This commit modifies the locking order to always be in the order: 1. multi_task_context.task_rec_mutex 2. buffer_mutex Fixes #876
2019-02-05 16:34:40 +00:00
gst_task_stop (klass->multi_task_context.task);
curl: Add curlhttpsrc element Merged from https://github.com/bbc/gst-curlhttpsrc commit f8aabcfc5c50a44f3362de831377d6e86dcd2d49 https://bugzilla.gnome.org/show_bug.cgi?id=744261
2017-07-25 14:23:57 +00:00
klass->multi_task_context.state = GSTCURL_MULTI_LOOP_STATE_STOP;
g_cond_signal (&klass->multi_task_context.signal);
g_mutex_unlock (&klass->multi_task_context.mutex);
curlhttpsrc: fix various leaks and thread safety issues curlhttpsrc uses a single thread running the gst_curl_http_src_curl_multi_loop() function to handle receiving data and messages from libcurl. Each instance of curlhttpsrc adds an entry into a queue in GstCurlHttpSrcMultiTaskContext and waits for the multi_loop to perform the HTTP request. Valgrind has shown up race conditions and memory leaks: 1. gst_curl_http_src_change_state() does not wait for the multi_loop to complete before going to the NULL state, which means that an instance of GstCurlHttpSrc can be released while gst_curl_http_src_curl_multi_loop() still has a reference to it. 2. if multiple elements try to be removed from the queue at once, only the last one is deleted. 3. source->caps is leaked 4. curl multi_handle is leaked 5. leak of curl_handle if URI not set 6. leak of http_headers when reusing element 7. null pointer dereference in negotiate caps 8. double-free of the default user-agent string 9. leak of multi_task_context.task This commit changes the logic so that each element has a connection status, which is used by the multi_loop to decide when to remove an element from its queue. An instance of curlhttpsrc will not enter the NULL state until its reference has been removed from the queue. When shutting down the curl multi loop, the memory allocated from the call to curl_multi_init() is now released. When gstadaptivedemux uses a URI source element, it will re-use it for multiple requests, moving it between READY and PLAYING between each request. curlhttpsrc was leaking the http_headers structure in this use case. The gst_curl_http_src_negotiate_caps() function extracts the "response-headers" field from the http_headers, but did not check that this field might be NULL. If the user-agent property is set, the global user-agent string was freed. This caused a double-free error if the user-agent is ever set a second time during the execution of the process. There are situations within curlhttpsrc where the code needs both the global multi_task_context mutex and the per-element buffer_mutex. To avoid deadlocks, it is vital that the order in which these are requested is always the same. This commit modifies the locking order to always be in the order: 1. multi_task_context.task_rec_mutex 2. buffer_mutex Fixes #876
2019-02-05 16:34:40 +00:00
GST_DEBUG_OBJECT (src, "Joining curl_multi_loop task...");
curl: Add curlhttpsrc element Merged from https://github.com/bbc/gst-curlhttpsrc commit f8aabcfc5c50a44f3362de831377d6e86dcd2d49 https://bugzilla.gnome.org/show_bug.cgi?id=744261
2017-07-25 14:23:57 +00:00
gst_task_join (klass->multi_task_context.task);
curlhttpsrc: fix various leaks and thread safety issues curlhttpsrc uses a single thread running the gst_curl_http_src_curl_multi_loop() function to handle receiving data and messages from libcurl. Each instance of curlhttpsrc adds an entry into a queue in GstCurlHttpSrcMultiTaskContext and waits for the multi_loop to perform the HTTP request. Valgrind has shown up race conditions and memory leaks: 1. gst_curl_http_src_change_state() does not wait for the multi_loop to complete before going to the NULL state, which means that an instance of GstCurlHttpSrc can be released while gst_curl_http_src_curl_multi_loop() still has a reference to it. 2. if multiple elements try to be removed from the queue at once, only the last one is deleted. 3. source->caps is leaked 4. curl multi_handle is leaked 5. leak of curl_handle if URI not set 6. leak of http_headers when reusing element 7. null pointer dereference in negotiate caps 8. double-free of the default user-agent string 9. leak of multi_task_context.task This commit changes the logic so that each element has a connection status, which is used by the multi_loop to decide when to remove an element from its queue. An instance of curlhttpsrc will not enter the NULL state until its reference has been removed from the queue. When shutting down the curl multi loop, the memory allocated from the call to curl_multi_init() is now released. When gstadaptivedemux uses a URI source element, it will re-use it for multiple requests, moving it between READY and PLAYING between each request. curlhttpsrc was leaking the http_headers structure in this use case. The gst_curl_http_src_negotiate_caps() function extracts the "response-headers" field from the http_headers, but did not check that this field might be NULL. If the user-agent property is set, the global user-agent string was freed. This caused a double-free error if the user-agent is ever set a second time during the execution of the process. There are situations within curlhttpsrc where the code needs both the global multi_task_context mutex and the per-element buffer_mutex. To avoid deadlocks, it is vital that the order in which these are requested is always the same. This commit modifies the locking order to always be in the order: 1. multi_task_context.task_rec_mutex 2. buffer_mutex Fixes #876
2019-02-05 16:34:40 +00:00
gst_object_unref (klass->multi_task_context.task);
klass->multi_task_context.task = NULL;
curl_multi_cleanup (klass->multi_task_context.multi_handle);
klass->multi_task_context.multi_handle = NULL;
g_rec_mutex_clear (&klass->multi_task_context.task_rec_mutex);
GST_DEBUG_OBJECT (src, "multi_task_context cleanup complete");
curl: Add curlhttpsrc element Merged from https://github.com/bbc/gst-curlhttpsrc commit f8aabcfc5c50a44f3362de831377d6e86dcd2d49 https://bugzilla.gnome.org/show_bug.cgi?id=744261
2017-07-25 14:23:57 +00:00
} else {
g_mutex_unlock (&klass->multi_task_context.mutex);
}
GSTCURL_FUNCTION_EXIT (src);
}
static void
gst_curl_http_src_finalize (GObject * obj)
{
GstCurlHttpSrc *src = GST_CURLHTTPSRC (obj);
GSTCURL_FUNCTION_ENTRY (src);
/* Cleanup all memory allocated */
gst_curl_http_src_cleanup_instance (src);
GSTCURL_FUNCTION_EXIT (src);
curlhttpsrc: fix various leaks and thread safety issues curlhttpsrc uses a single thread running the gst_curl_http_src_curl_multi_loop() function to handle receiving data and messages from libcurl. Each instance of curlhttpsrc adds an entry into a queue in GstCurlHttpSrcMultiTaskContext and waits for the multi_loop to perform the HTTP request. Valgrind has shown up race conditions and memory leaks: 1. gst_curl_http_src_change_state() does not wait for the multi_loop to complete before going to the NULL state, which means that an instance of GstCurlHttpSrc can be released while gst_curl_http_src_curl_multi_loop() still has a reference to it. 2. if multiple elements try to be removed from the queue at once, only the last one is deleted. 3. source->caps is leaked 4. curl multi_handle is leaked 5. leak of curl_handle if URI not set 6. leak of http_headers when reusing element 7. null pointer dereference in negotiate caps 8. double-free of the default user-agent string 9. leak of multi_task_context.task This commit changes the logic so that each element has a connection status, which is used by the multi_loop to decide when to remove an element from its queue. An instance of curlhttpsrc will not enter the NULL state until its reference has been removed from the queue. When shutting down the curl multi loop, the memory allocated from the call to curl_multi_init() is now released. When gstadaptivedemux uses a URI source element, it will re-use it for multiple requests, moving it between READY and PLAYING between each request. curlhttpsrc was leaking the http_headers structure in this use case. The gst_curl_http_src_negotiate_caps() function extracts the "response-headers" field from the http_headers, but did not check that this field might be NULL. If the user-agent property is set, the global user-agent string was freed. This caused a double-free error if the user-agent is ever set a second time during the execution of the process. There are situations within curlhttpsrc where the code needs both the global multi_task_context mutex and the per-element buffer_mutex. To avoid deadlocks, it is vital that the order in which these are requested is always the same. This commit modifies the locking order to always be in the order: 1. multi_task_context.task_rec_mutex 2. buffer_mutex Fixes #876
2019-02-05 16:34:40 +00:00
/* Chain up to parent class */
G_OBJECT_CLASS (gst_curl_http_src_parent_class)->finalize (obj);
curl: Add curlhttpsrc element Merged from https://github.com/bbc/gst-curlhttpsrc commit f8aabcfc5c50a44f3362de831377d6e86dcd2d49 https://bugzilla.gnome.org/show_bug.cgi?id=744261
2017-07-25 14:23:57 +00:00
}
/*
* Do the transfer. If the transfer hasn't begun yet, start a new curl handle
* and pass it to the multi queue to be operated on. Then wait for any blocks
* of data and push them to the source pad.
*/
static GstFlowReturn
gst_curl_http_src_create (GstPushSrc * psrc, GstBuffer ** outbuf)
{
GstFlowReturn ret;
GstCurlHttpSrc *src = GST_CURLHTTPSRC (psrc);
GstCurlHttpSrcClass *klass;
curlhttpsrc: Fix flagged Coverity errors Fixes CIDs 1415707 - 1415717
2017-07-26 16:06:17 +00:00
GstStructure *empty_headers;
curlhttpsrc: fix various leaks and thread safety issues curlhttpsrc uses a single thread running the gst_curl_http_src_curl_multi_loop() function to handle receiving data and messages from libcurl. Each instance of curlhttpsrc adds an entry into a queue in GstCurlHttpSrcMultiTaskContext and waits for the multi_loop to perform the HTTP request. Valgrind has shown up race conditions and memory leaks: 1. gst_curl_http_src_change_state() does not wait for the multi_loop to complete before going to the NULL state, which means that an instance of GstCurlHttpSrc can be released while gst_curl_http_src_curl_multi_loop() still has a reference to it. 2. if multiple elements try to be removed from the queue at once, only the last one is deleted. 3. source->caps is leaked 4. curl multi_handle is leaked 5. leak of curl_handle if URI not set 6. leak of http_headers when reusing element 7. null pointer dereference in negotiate caps 8. double-free of the default user-agent string 9. leak of multi_task_context.task This commit changes the logic so that each element has a connection status, which is used by the multi_loop to decide when to remove an element from its queue. An instance of curlhttpsrc will not enter the NULL state until its reference has been removed from the queue. When shutting down the curl multi loop, the memory allocated from the call to curl_multi_init() is now released. When gstadaptivedemux uses a URI source element, it will re-use it for multiple requests, moving it between READY and PLAYING between each request. curlhttpsrc was leaking the http_headers structure in this use case. The gst_curl_http_src_negotiate_caps() function extracts the "response-headers" field from the http_headers, but did not check that this field might be NULL. If the user-agent property is set, the global user-agent string was freed. This caused a double-free error if the user-agent is ever set a second time during the execution of the process. There are situations within curlhttpsrc where the code needs both the global multi_task_context mutex and the per-element buffer_mutex. To avoid deadlocks, it is vital that the order in which these are requested is always the same. This commit modifies the locking order to always be in the order: 1. multi_task_context.task_rec_mutex 2. buffer_mutex Fixes #876
2019-02-05 16:34:40 +00:00
GstBaseSrc *basesrc;
GSTCURL_FUNCTION_ENTRY (src);
curl: Add curlhttpsrc element Merged from https://github.com/bbc/gst-curlhttpsrc commit f8aabcfc5c50a44f3362de831377d6e86dcd2d49 https://bugzilla.gnome.org/show_bug.cgi?id=744261
2017-07-25 14:23:57 +00:00
klass = G_TYPE_INSTANCE_GET_CLASS (src, GST_TYPE_CURL_HTTP_SRC,
GstCurlHttpSrcClass);
curlhttpsrc: fix various leaks and thread safety issues curlhttpsrc uses a single thread running the gst_curl_http_src_curl_multi_loop() function to handle receiving data and messages from libcurl. Each instance of curlhttpsrc adds an entry into a queue in GstCurlHttpSrcMultiTaskContext and waits for the multi_loop to perform the HTTP request. Valgrind has shown up race conditions and memory leaks: 1. gst_curl_http_src_change_state() does not wait for the multi_loop to complete before going to the NULL state, which means that an instance of GstCurlHttpSrc can be released while gst_curl_http_src_curl_multi_loop() still has a reference to it. 2. if multiple elements try to be removed from the queue at once, only the last one is deleted. 3. source->caps is leaked 4. curl multi_handle is leaked 5. leak of curl_handle if URI not set 6. leak of http_headers when reusing element 7. null pointer dereference in negotiate caps 8. double-free of the default user-agent string 9. leak of multi_task_context.task This commit changes the logic so that each element has a connection status, which is used by the multi_loop to decide when to remove an element from its queue. An instance of curlhttpsrc will not enter the NULL state until its reference has been removed from the queue. When shutting down the curl multi loop, the memory allocated from the call to curl_multi_init() is now released. When gstadaptivedemux uses a URI source element, it will re-use it for multiple requests, moving it between READY and PLAYING between each request. curlhttpsrc was leaking the http_headers structure in this use case. The gst_curl_http_src_negotiate_caps() function extracts the "response-headers" field from the http_headers, but did not check that this field might be NULL. If the user-agent property is set, the global user-agent string was freed. This caused a double-free error if the user-agent is ever set a second time during the execution of the process. There are situations within curlhttpsrc where the code needs both the global multi_task_context mutex and the per-element buffer_mutex. To avoid deadlocks, it is vital that the order in which these are requested is always the same. This commit modifies the locking order to always be in the order: 1. multi_task_context.task_rec_mutex 2. buffer_mutex Fixes #876
2019-02-05 16:34:40 +00:00
basesrc = GST_BASE_SRC_CAST (src);
curl: Add curlhttpsrc element Merged from https://github.com/bbc/gst-curlhttpsrc commit f8aabcfc5c50a44f3362de831377d6e86dcd2d49 https://bugzilla.gnome.org/show_bug.cgi?id=744261
2017-07-25 14:23:57 +00:00
curlhttpsrc: fix various leaks and thread safety issues curlhttpsrc uses a single thread running the gst_curl_http_src_curl_multi_loop() function to handle receiving data and messages from libcurl. Each instance of curlhttpsrc adds an entry into a queue in GstCurlHttpSrcMultiTaskContext and waits for the multi_loop to perform the HTTP request. Valgrind has shown up race conditions and memory leaks: 1. gst_curl_http_src_change_state() does not wait for the multi_loop to complete before going to the NULL state, which means that an instance of GstCurlHttpSrc can be released while gst_curl_http_src_curl_multi_loop() still has a reference to it. 2. if multiple elements try to be removed from the queue at once, only the last one is deleted. 3. source->caps is leaked 4. curl multi_handle is leaked 5. leak of curl_handle if URI not set 6. leak of http_headers when reusing element 7. null pointer dereference in negotiate caps 8. double-free of the default user-agent string 9. leak of multi_task_context.task This commit changes the logic so that each element has a connection status, which is used by the multi_loop to decide when to remove an element from its queue. An instance of curlhttpsrc will not enter the NULL state until its reference has been removed from the queue. When shutting down the curl multi loop, the memory allocated from the call to curl_multi_init() is now released. When gstadaptivedemux uses a URI source element, it will re-use it for multiple requests, moving it between READY and PLAYING between each request. curlhttpsrc was leaking the http_headers structure in this use case. The gst_curl_http_src_negotiate_caps() function extracts the "response-headers" field from the http_headers, but did not check that this field might be NULL. If the user-agent property is set, the global user-agent string was freed. This caused a double-free error if the user-agent is ever set a second time during the execution of the process. There are situations within curlhttpsrc where the code needs both the global multi_task_context mutex and the per-element buffer_mutex. To avoid deadlocks, it is vital that the order in which these are requested is always the same. This commit modifies the locking order to always be in the order: 1. multi_task_context.task_rec_mutex 2. buffer_mutex Fixes #876
2019-02-05 16:34:40 +00:00
retry:
curl: Add curlhttpsrc element Merged from https://github.com/bbc/gst-curlhttpsrc commit f8aabcfc5c50a44f3362de831377d6e86dcd2d49 https://bugzilla.gnome.org/show_bug.cgi?id=744261
2017-07-25 14:23:57 +00:00
ret = GST_FLOW_OK;
curlhttpsrc: fix various leaks and thread safety issues curlhttpsrc uses a single thread running the gst_curl_http_src_curl_multi_loop() function to handle receiving data and messages from libcurl. Each instance of curlhttpsrc adds an entry into a queue in GstCurlHttpSrcMultiTaskContext and waits for the multi_loop to perform the HTTP request. Valgrind has shown up race conditions and memory leaks: 1. gst_curl_http_src_change_state() does not wait for the multi_loop to complete before going to the NULL state, which means that an instance of GstCurlHttpSrc can be released while gst_curl_http_src_curl_multi_loop() still has a reference to it. 2. if multiple elements try to be removed from the queue at once, only the last one is deleted. 3. source->caps is leaked 4. curl multi_handle is leaked 5. leak of curl_handle if URI not set 6. leak of http_headers when reusing element 7. null pointer dereference in negotiate caps 8. double-free of the default user-agent string 9. leak of multi_task_context.task This commit changes the logic so that each element has a connection status, which is used by the multi_loop to decide when to remove an element from its queue. An instance of curlhttpsrc will not enter the NULL state until its reference has been removed from the queue. When shutting down the curl multi loop, the memory allocated from the call to curl_multi_init() is now released. When gstadaptivedemux uses a URI source element, it will re-use it for multiple requests, moving it between READY and PLAYING between each request. curlhttpsrc was leaking the http_headers structure in this use case. The gst_curl_http_src_negotiate_caps() function extracts the "response-headers" field from the http_headers, but did not check that this field might be NULL. If the user-agent property is set, the global user-agent string was freed. This caused a double-free error if the user-agent is ever set a second time during the execution of the process. There are situations within curlhttpsrc where the code needs both the global multi_task_context mutex and the per-element buffer_mutex. To avoid deadlocks, it is vital that the order in which these are requested is always the same. This commit modifies the locking order to always be in the order: 1. multi_task_context.task_rec_mutex 2. buffer_mutex Fixes #876
2019-02-05 16:34:40 +00:00
/* NOTE: when both the buffer_mutex and multi_task_context.mutex are
needed, multi_task_context.mutex must be acquired first */
g_mutex_lock (&klass->multi_task_context.mutex);
curl: Add curlhttpsrc element Merged from https://github.com/bbc/gst-curlhttpsrc commit f8aabcfc5c50a44f3362de831377d6e86dcd2d49 https://bugzilla.gnome.org/show_bug.cgi?id=744261
2017-07-25 14:23:57 +00:00
g_mutex_lock (&src->buffer_mutex);
if (src->state == GSTCURL_UNLOCK) {
ret = GST_FLOW_FLUSHING;
goto escape;
}
if (!src->transfer_begun) {
GST_DEBUG_OBJECT (src, "Starting new request for URI %s", src->uri);
/* Create the Easy Handle and set up the session. */
src->curl_handle = gst_curl_http_src_create_easy_handle (src);
curlhttpsrc: Fix flagged Coverity errors Fixes CIDs 1415707 - 1415717
2017-07-26 16:06:17 +00:00
if (src->curl_handle == NULL) {
ret = GST_FLOW_ERROR;
goto escape;
}
curl: Add curlhttpsrc element Merged from https://github.com/bbc/gst-curlhttpsrc commit f8aabcfc5c50a44f3362de831377d6e86dcd2d49 https://bugzilla.gnome.org/show_bug.cgi?id=744261
2017-07-25 14:23:57 +00:00
if (gst_curl_http_src_add_queue_item (&klass->multi_task_context.queue, src)
== FALSE) {
GST_ERROR_OBJECT (src, "Couldn't create new queue item! Aborting...");
curlhttpsrc: Fix flagged Coverity errors Fixes CIDs 1415707 - 1415717
2017-07-26 16:06:17 +00:00
ret = GST_FLOW_ERROR;
goto escape;
curl: Add curlhttpsrc element Merged from https://github.com/bbc/gst-curlhttpsrc commit f8aabcfc5c50a44f3362de831377d6e86dcd2d49 https://bugzilla.gnome.org/show_bug.cgi?id=744261
2017-07-25 14:23:57 +00:00
}
/* Signal the worker thread */
g_cond_signal (&klass->multi_task_context.signal);
src->state = GSTCURL_OK;
src->transfer_begun = TRUE;
src->data_received = FALSE;
GST_DEBUG_OBJECT (src, "Submitted request for URI %s to curl", src->uri);
curlhttpsrc: fix various leaks and thread safety issues curlhttpsrc uses a single thread running the gst_curl_http_src_curl_multi_loop() function to handle receiving data and messages from libcurl. Each instance of curlhttpsrc adds an entry into a queue in GstCurlHttpSrcMultiTaskContext and waits for the multi_loop to perform the HTTP request. Valgrind has shown up race conditions and memory leaks: 1. gst_curl_http_src_change_state() does not wait for the multi_loop to complete before going to the NULL state, which means that an instance of GstCurlHttpSrc can be released while gst_curl_http_src_curl_multi_loop() still has a reference to it. 2. if multiple elements try to be removed from the queue at once, only the last one is deleted. 3. source->caps is leaked 4. curl multi_handle is leaked 5. leak of curl_handle if URI not set 6. leak of http_headers when reusing element 7. null pointer dereference in negotiate caps 8. double-free of the default user-agent string 9. leak of multi_task_context.task This commit changes the logic so that each element has a connection status, which is used by the multi_loop to decide when to remove an element from its queue. An instance of curlhttpsrc will not enter the NULL state until its reference has been removed from the queue. When shutting down the curl multi loop, the memory allocated from the call to curl_multi_init() is now released. When gstadaptivedemux uses a URI source element, it will re-use it for multiple requests, moving it between READY and PLAYING between each request. curlhttpsrc was leaking the http_headers structure in this use case. The gst_curl_http_src_negotiate_caps() function extracts the "response-headers" field from the http_headers, but did not check that this field might be NULL. If the user-agent property is set, the global user-agent string was freed. This caused a double-free error if the user-agent is ever set a second time during the execution of the process. There are situations within curlhttpsrc where the code needs both the global multi_task_context mutex and the per-element buffer_mutex. To avoid deadlocks, it is vital that the order in which these are requested is always the same. This commit modifies the locking order to always be in the order: 1. multi_task_context.task_rec_mutex 2. buffer_mutex Fixes #876
2019-02-05 16:34:40 +00:00
if (src->http_headers != NULL) {
gst_structure_free (src->http_headers);
}
curlhttpsrc: Fix flagged Coverity errors Fixes CIDs 1415707 - 1415717
2017-07-26 16:06:17 +00:00
empty_headers = gst_structure_new_empty (RESPONSE_HEADERS_NAME);
curl: Add curlhttpsrc element Merged from https://github.com/bbc/gst-curlhttpsrc commit f8aabcfc5c50a44f3362de831377d6e86dcd2d49 https://bugzilla.gnome.org/show_bug.cgi?id=744261
2017-07-25 14:23:57 +00:00
src->http_headers = gst_structure_new (HTTP_HEADERS_NAME,
URI_NAME, G_TYPE_STRING, src->uri,
REQUEST_HEADERS_NAME, GST_TYPE_STRUCTURE, src->request_headers,
curlhttpsrc: Fix flagged Coverity errors Fixes CIDs 1415707 - 1415717
2017-07-26 16:06:17 +00:00
RESPONSE_HEADERS_NAME, GST_TYPE_STRUCTURE, empty_headers, NULL);
gst_structure_free (empty_headers);
curl: Add curlhttpsrc element Merged from https://github.com/bbc/gst-curlhttpsrc commit f8aabcfc5c50a44f3362de831377d6e86dcd2d49 https://bugzilla.gnome.org/show_bug.cgi?id=744261
2017-07-25 14:23:57 +00:00
GST_INFO_OBJECT (src, "Created a new headers object");
}
curlhttpsrc: fix various leaks and thread safety issues curlhttpsrc uses a single thread running the gst_curl_http_src_curl_multi_loop() function to handle receiving data and messages from libcurl. Each instance of curlhttpsrc adds an entry into a queue in GstCurlHttpSrcMultiTaskContext and waits for the multi_loop to perform the HTTP request. Valgrind has shown up race conditions and memory leaks: 1. gst_curl_http_src_change_state() does not wait for the multi_loop to complete before going to the NULL state, which means that an instance of GstCurlHttpSrc can be released while gst_curl_http_src_curl_multi_loop() still has a reference to it. 2. if multiple elements try to be removed from the queue at once, only the last one is deleted. 3. source->caps is leaked 4. curl multi_handle is leaked 5. leak of curl_handle if URI not set 6. leak of http_headers when reusing element 7. null pointer dereference in negotiate caps 8. double-free of the default user-agent string 9. leak of multi_task_context.task This commit changes the logic so that each element has a connection status, which is used by the multi_loop to decide when to remove an element from its queue. An instance of curlhttpsrc will not enter the NULL state until its reference has been removed from the queue. When shutting down the curl multi loop, the memory allocated from the call to curl_multi_init() is now released. When gstadaptivedemux uses a URI source element, it will re-use it for multiple requests, moving it between READY and PLAYING between each request. curlhttpsrc was leaking the http_headers structure in this use case. The gst_curl_http_src_negotiate_caps() function extracts the "response-headers" field from the http_headers, but did not check that this field might be NULL. If the user-agent property is set, the global user-agent string was freed. This caused a double-free error if the user-agent is ever set a second time during the execution of the process. There are situations within curlhttpsrc where the code needs both the global multi_task_context mutex and the per-element buffer_mutex. To avoid deadlocks, it is vital that the order in which these are requested is always the same. This commit modifies the locking order to always be in the order: 1. multi_task_context.task_rec_mutex 2. buffer_mutex Fixes #876
2019-02-05 16:34:40 +00:00
g_mutex_unlock (&klass->multi_task_context.mutex);
curl: Add curlhttpsrc element Merged from https://github.com/bbc/gst-curlhttpsrc commit f8aabcfc5c50a44f3362de831377d6e86dcd2d49 https://bugzilla.gnome.org/show_bug.cgi?id=744261
2017-07-25 14:23:57 +00:00
/* Wait for data to become available, then punt it downstream */
curlhttpsrc: fix various leaks and thread safety issues curlhttpsrc uses a single thread running the gst_curl_http_src_curl_multi_loop() function to handle receiving data and messages from libcurl. Each instance of curlhttpsrc adds an entry into a queue in GstCurlHttpSrcMultiTaskContext and waits for the multi_loop to perform the HTTP request. Valgrind has shown up race conditions and memory leaks: 1. gst_curl_http_src_change_state() does not wait for the multi_loop to complete before going to the NULL state, which means that an instance of GstCurlHttpSrc can be released while gst_curl_http_src_curl_multi_loop() still has a reference to it. 2. if multiple elements try to be removed from the queue at once, only the last one is deleted. 3. source->caps is leaked 4. curl multi_handle is leaked 5. leak of curl_handle if URI not set 6. leak of http_headers when reusing element 7. null pointer dereference in negotiate caps 8. double-free of the default user-agent string 9. leak of multi_task_context.task This commit changes the logic so that each element has a connection status, which is used by the multi_loop to decide when to remove an element from its queue. An instance of curlhttpsrc will not enter the NULL state until its reference has been removed from the queue. When shutting down the curl multi loop, the memory allocated from the call to curl_multi_init() is now released. When gstadaptivedemux uses a URI source element, it will re-use it for multiple requests, moving it between READY and PLAYING between each request. curlhttpsrc was leaking the http_headers structure in this use case. The gst_curl_http_src_negotiate_caps() function extracts the "response-headers" field from the http_headers, but did not check that this field might be NULL. If the user-agent property is set, the global user-agent string was freed. This caused a double-free error if the user-agent is ever set a second time during the execution of the process. There are situations within curlhttpsrc where the code needs both the global multi_task_context mutex and the per-element buffer_mutex. To avoid deadlocks, it is vital that the order in which these are requested is always the same. This commit modifies the locking order to always be in the order: 1. multi_task_context.task_rec_mutex 2. buffer_mutex Fixes #876
2019-02-05 16:34:40 +00:00
while ((src->buffer_len == 0) && (src->state == GSTCURL_OK)
&& (src->connection_status == GSTCURL_CONNECTED)) {
g_cond_wait (&src->buffer_cond, &src->buffer_mutex);
curl: Add curlhttpsrc element Merged from https://github.com/bbc/gst-curlhttpsrc commit f8aabcfc5c50a44f3362de831377d6e86dcd2d49 https://bugzilla.gnome.org/show_bug.cgi?id=744261
2017-07-25 14:23:57 +00:00
}
if (src->state == GSTCURL_UNLOCK) {
if (src->buffer_len > 0) {
g_free (src->buffer);
src->buffer = NULL;
src->buffer_len = 0;
}
curlhttpsrc: fix various leaks and thread safety issues curlhttpsrc uses a single thread running the gst_curl_http_src_curl_multi_loop() function to handle receiving data and messages from libcurl. Each instance of curlhttpsrc adds an entry into a queue in GstCurlHttpSrcMultiTaskContext and waits for the multi_loop to perform the HTTP request. Valgrind has shown up race conditions and memory leaks: 1. gst_curl_http_src_change_state() does not wait for the multi_loop to complete before going to the NULL state, which means that an instance of GstCurlHttpSrc can be released while gst_curl_http_src_curl_multi_loop() still has a reference to it. 2. if multiple elements try to be removed from the queue at once, only the last one is deleted. 3. source->caps is leaked 4. curl multi_handle is leaked 5. leak of curl_handle if URI not set 6. leak of http_headers when reusing element 7. null pointer dereference in negotiate caps 8. double-free of the default user-agent string 9. leak of multi_task_context.task This commit changes the logic so that each element has a connection status, which is used by the multi_loop to decide when to remove an element from its queue. An instance of curlhttpsrc will not enter the NULL state until its reference has been removed from the queue. When shutting down the curl multi loop, the memory allocated from the call to curl_multi_init() is now released. When gstadaptivedemux uses a URI source element, it will re-use it for multiple requests, moving it between READY and PLAYING between each request. curlhttpsrc was leaking the http_headers structure in this use case. The gst_curl_http_src_negotiate_caps() function extracts the "response-headers" field from the http_headers, but did not check that this field might be NULL. If the user-agent property is set, the global user-agent string was freed. This caused a double-free error if the user-agent is ever set a second time during the execution of the process. There are situations within curlhttpsrc where the code needs both the global multi_task_context mutex and the per-element buffer_mutex. To avoid deadlocks, it is vital that the order in which these are requested is always the same. This commit modifies the locking order to always be in the order: 1. multi_task_context.task_rec_mutex 2. buffer_mutex Fixes #876
2019-02-05 16:34:40 +00:00
g_mutex_unlock (&src->buffer_mutex);
return GST_FLOW_FLUSHING;
curl: Add curlhttpsrc element Merged from https://github.com/bbc/gst-curlhttpsrc commit f8aabcfc5c50a44f3362de831377d6e86dcd2d49 https://bugzilla.gnome.org/show_bug.cgi?id=744261
2017-07-25 14:23:57 +00:00
}
ret = gst_curl_http_src_handle_response (src);
switch (ret) {
case GST_FLOW_ERROR:
curlhttpsrc: fix various leaks and thread safety issues curlhttpsrc uses a single thread running the gst_curl_http_src_curl_multi_loop() function to handle receiving data and messages from libcurl. Each instance of curlhttpsrc adds an entry into a queue in GstCurlHttpSrcMultiTaskContext and waits for the multi_loop to perform the HTTP request. Valgrind has shown up race conditions and memory leaks: 1. gst_curl_http_src_change_state() does not wait for the multi_loop to complete before going to the NULL state, which means that an instance of GstCurlHttpSrc can be released while gst_curl_http_src_curl_multi_loop() still has a reference to it. 2. if multiple elements try to be removed from the queue at once, only the last one is deleted. 3. source->caps is leaked 4. curl multi_handle is leaked 5. leak of curl_handle if URI not set 6. leak of http_headers when reusing element 7. null pointer dereference in negotiate caps 8. double-free of the default user-agent string 9. leak of multi_task_context.task This commit changes the logic so that each element has a connection status, which is used by the multi_loop to decide when to remove an element from its queue. An instance of curlhttpsrc will not enter the NULL state until its reference has been removed from the queue. When shutting down the curl multi loop, the memory allocated from the call to curl_multi_init() is now released. When gstadaptivedemux uses a URI source element, it will re-use it for multiple requests, moving it between READY and PLAYING between each request. curlhttpsrc was leaking the http_headers structure in this use case. The gst_curl_http_src_negotiate_caps() function extracts the "response-headers" field from the http_headers, but did not check that this field might be NULL. If the user-agent property is set, the global user-agent string was freed. This caused a double-free error if the user-agent is ever set a second time during the execution of the process. There are situations within curlhttpsrc where the code needs both the global multi_task_context mutex and the per-element buffer_mutex. To avoid deadlocks, it is vital that the order in which these are requested is always the same. This commit modifies the locking order to always be in the order: 1. multi_task_context.task_rec_mutex 2. buffer_mutex Fixes #876
2019-02-05 16:34:40 +00:00
/* Don't attempt a retry, just bomb out */
g_mutex_unlock (&src->buffer_mutex);
return ret;
curl: Add curlhttpsrc element Merged from https://github.com/bbc/gst-curlhttpsrc commit f8aabcfc5c50a44f3362de831377d6e86dcd2d49 https://bugzilla.gnome.org/show_bug.cgi?id=744261
2017-07-25 14:23:57 +00:00
case GST_FLOW_CUSTOM_ERROR:
if (src->data_received == TRUE) {
/*
* If data has already been received, we can't recall previously sent
* buffers so don't attempt a retry in this case.
*
* TODO: Remember the position we got to, and make a range request for
* the resource without the bit we've already received?
*/
GST_WARNING_OBJECT (src,
"Failed mid-transfer, can't continue for URI %s", src->uri);
curlhttpsrc: fix various leaks and thread safety issues curlhttpsrc uses a single thread running the gst_curl_http_src_curl_multi_loop() function to handle receiving data and messages from libcurl. Each instance of curlhttpsrc adds an entry into a queue in GstCurlHttpSrcMultiTaskContext and waits for the multi_loop to perform the HTTP request. Valgrind has shown up race conditions and memory leaks: 1. gst_curl_http_src_change_state() does not wait for the multi_loop to complete before going to the NULL state, which means that an instance of GstCurlHttpSrc can be released while gst_curl_http_src_curl_multi_loop() still has a reference to it. 2. if multiple elements try to be removed from the queue at once, only the last one is deleted. 3. source->caps is leaked 4. curl multi_handle is leaked 5. leak of curl_handle if URI not set 6. leak of http_headers when reusing element 7. null pointer dereference in negotiate caps 8. double-free of the default user-agent string 9. leak of multi_task_context.task This commit changes the logic so that each element has a connection status, which is used by the multi_loop to decide when to remove an element from its queue. An instance of curlhttpsrc will not enter the NULL state until its reference has been removed from the queue. When shutting down the curl multi loop, the memory allocated from the call to curl_multi_init() is now released. When gstadaptivedemux uses a URI source element, it will re-use it for multiple requests, moving it between READY and PLAYING between each request. curlhttpsrc was leaking the http_headers structure in this use case. The gst_curl_http_src_negotiate_caps() function extracts the "response-headers" field from the http_headers, but did not check that this field might be NULL. If the user-agent property is set, the global user-agent string was freed. This caused a double-free error if the user-agent is ever set a second time during the execution of the process. There are situations within curlhttpsrc where the code needs both the global multi_task_context mutex and the per-element buffer_mutex. To avoid deadlocks, it is vital that the order in which these are requested is always the same. This commit modifies the locking order to always be in the order: 1. multi_task_context.task_rec_mutex 2. buffer_mutex Fixes #876
2019-02-05 16:34:40 +00:00
g_mutex_unlock (&src->buffer_mutex);
return GST_FLOW_ERROR;
curl: Add curlhttpsrc element Merged from https://github.com/bbc/gst-curlhttpsrc commit f8aabcfc5c50a44f3362de831377d6e86dcd2d49 https://bugzilla.gnome.org/show_bug.cgi?id=744261
2017-07-25 14:23:57 +00:00
}
src->retries_remaining--;
if (src->retries_remaining == 0) {
GST_WARNING_OBJECT (src, "Out of retries for URI %s", src->uri);
curlhttpsrc: fix various leaks and thread safety issues curlhttpsrc uses a single thread running the gst_curl_http_src_curl_multi_loop() function to handle receiving data and messages from libcurl. Each instance of curlhttpsrc adds an entry into a queue in GstCurlHttpSrcMultiTaskContext and waits for the multi_loop to perform the HTTP request. Valgrind has shown up race conditions and memory leaks: 1. gst_curl_http_src_change_state() does not wait for the multi_loop to complete before going to the NULL state, which means that an instance of GstCurlHttpSrc can be released while gst_curl_http_src_curl_multi_loop() still has a reference to it. 2. if multiple elements try to be removed from the queue at once, only the last one is deleted. 3. source->caps is leaked 4. curl multi_handle is leaked 5. leak of curl_handle if URI not set 6. leak of http_headers when reusing element 7. null pointer dereference in negotiate caps 8. double-free of the default user-agent string 9. leak of multi_task_context.task This commit changes the logic so that each element has a connection status, which is used by the multi_loop to decide when to remove an element from its queue. An instance of curlhttpsrc will not enter the NULL state until its reference has been removed from the queue. When shutting down the curl multi loop, the memory allocated from the call to curl_multi_init() is now released. When gstadaptivedemux uses a URI source element, it will re-use it for multiple requests, moving it between READY and PLAYING between each request. curlhttpsrc was leaking the http_headers structure in this use case. The gst_curl_http_src_negotiate_caps() function extracts the "response-headers" field from the http_headers, but did not check that this field might be NULL. If the user-agent property is set, the global user-agent string was freed. This caused a double-free error if the user-agent is ever set a second time during the execution of the process. There are situations within curlhttpsrc where the code needs both the global multi_task_context mutex and the per-element buffer_mutex. To avoid deadlocks, it is vital that the order in which these are requested is always the same. This commit modifies the locking order to always be in the order: 1. multi_task_context.task_rec_mutex 2. buffer_mutex Fixes #876
2019-02-05 16:34:40 +00:00
g_mutex_unlock (&src->buffer_mutex);
return GST_FLOW_ERROR; /* Don't attempt a retry, just bomb out */
curl: Add curlhttpsrc element Merged from https://github.com/bbc/gst-curlhttpsrc commit f8aabcfc5c50a44f3362de831377d6e86dcd2d49 https://bugzilla.gnome.org/show_bug.cgi?id=744261
2017-07-25 14:23:57 +00:00
}
GST_INFO_OBJECT (src, "Attempting retry for URI %s", src->uri);
src->state = GSTCURL_NONE;
src->transfer_begun = FALSE;
src->status_code = 0;
curlhttpsrc: export same HTTP error status as souphttpsrc To make it closer to a drop-in replacement for souphttpsrc, expose the same gst_error_message_with_details as souphttpsrc, so that applications can received the HTTP status code and reason when an error occurs.
2019-02-05 17:06:50 +00:00
g_free (src->reason_phrase);
src->reason_phrase = NULL;
curl: Add curlhttpsrc element Merged from https://github.com/bbc/gst-curlhttpsrc commit f8aabcfc5c50a44f3362de831377d6e86dcd2d49 https://bugzilla.gnome.org/show_bug.cgi?id=744261
2017-07-25 14:23:57 +00:00
src->hdrs_updated = FALSE;
if (src->http_headers != NULL) {
gst_structure_free (src->http_headers);
src->http_headers = NULL;
GST_INFO_OBJECT (src, "NULL'd the headers");
}
gst_curl_http_src_destroy_easy_handle (src);
g_mutex_unlock (&src->buffer_mutex);
goto retry; /* Attempt a retry! */
default:
break;
}
if (((src->state == GSTCURL_OK) || (src->state == GSTCURL_DONE)) &&
(src->buffer_len > 0)) {
GST_DEBUG_OBJECT (src, "Pushing %u bytes of transfer for URI %s to pad",
src->buffer_len, src->uri);
*outbuf = gst_buffer_new_allocate (NULL, src->buffer_len, NULL);
gst_buffer_fill (*outbuf, 0, src->buffer, src->buffer_len);
curlhttpsrc: set BUFFER_OFFSET when creating GstBuffer To make curlhttpsrc behave more like souphttpsrc, set the BUFFER_OFFSET in its output buffers to match the segment start. This means that in a HTTP RANGE request, the BUFFER_OFFSET will match the value in the RANGE request.
2019-02-05 17:10:03 +00:00
GST_BUFFER_OFFSET (*outbuf) = basesrc->segment.position;
curl: Add curlhttpsrc element Merged from https://github.com/bbc/gst-curlhttpsrc commit f8aabcfc5c50a44f3362de831377d6e86dcd2d49 https://bugzilla.gnome.org/show_bug.cgi?id=744261
2017-07-25 14:23:57 +00:00
g_free (src->buffer);
src->buffer = NULL;
src->buffer_len = 0;
src->data_received = TRUE;
/* ret should still be GST_FLOW_OK */
} else if ((src->state == GSTCURL_DONE) && (src->buffer_len == 0)) {
GST_INFO_OBJECT (src, "Full body received, signalling EOS for URI %s.",
src->uri);
src->state = GSTCURL_NONE;
src->transfer_begun = FALSE;
src->status_code = 0;
curlhttpsrc: export same HTTP error status as souphttpsrc To make it closer to a drop-in replacement for souphttpsrc, expose the same gst_error_message_with_details as souphttpsrc, so that applications can received the HTTP status code and reason when an error occurs.
2019-02-05 17:06:50 +00:00
g_free (src->reason_phrase);
src->reason_phrase = NULL;
curl: Add curlhttpsrc element Merged from https://github.com/bbc/gst-curlhttpsrc commit f8aabcfc5c50a44f3362de831377d6e86dcd2d49 https://bugzilla.gnome.org/show_bug.cgi?id=744261
2017-07-25 14:23:57 +00:00
src->hdrs_updated = FALSE;
gst_curl_http_src_destroy_easy_handle (src);
ret = GST_FLOW_EOS;
} else {
switch (src->state) {
case GSTCURL_NONE:
GST_WARNING_OBJECT (src, "Got unexpected GSTCURL_NONE state!");
break;
case GSTCURL_REMOVED:
GST_WARNING_OBJECT (src, "Transfer got removed from the curl queue");
ret = GST_FLOW_EOS;
break;
case GSTCURL_BAD_QUEUE_REQUEST:
GST_ERROR_OBJECT (src, "Bad Queue Request!");
ret = GST_FLOW_ERROR;
break;
case GSTCURL_TOTAL_ERROR:
GST_ERROR_OBJECT (src, "Critical, unrecoverable error!");
ret = GST_FLOW_ERROR;
break;
case GSTCURL_PIPELINE_NULL:
GST_ERROR_OBJECT (src, "Pipeline null");
break;
default:
GST_ERROR_OBJECT (src, "Unknown state of %u", src->state);
}
}
curlhttpsrc: fix various leaks and thread safety issues curlhttpsrc uses a single thread running the gst_curl_http_src_curl_multi_loop() function to handle receiving data and messages from libcurl. Each instance of curlhttpsrc adds an entry into a queue in GstCurlHttpSrcMultiTaskContext and waits for the multi_loop to perform the HTTP request. Valgrind has shown up race conditions and memory leaks: 1. gst_curl_http_src_change_state() does not wait for the multi_loop to complete before going to the NULL state, which means that an instance of GstCurlHttpSrc can be released while gst_curl_http_src_curl_multi_loop() still has a reference to it. 2. if multiple elements try to be removed from the queue at once, only the last one is deleted. 3. source->caps is leaked 4. curl multi_handle is leaked 5. leak of curl_handle if URI not set 6. leak of http_headers when reusing element 7. null pointer dereference in negotiate caps 8. double-free of the default user-agent string 9. leak of multi_task_context.task This commit changes the logic so that each element has a connection status, which is used by the multi_loop to decide when to remove an element from its queue. An instance of curlhttpsrc will not enter the NULL state until its reference has been removed from the queue. When shutting down the curl multi loop, the memory allocated from the call to curl_multi_init() is now released. When gstadaptivedemux uses a URI source element, it will re-use it for multiple requests, moving it between READY and PLAYING between each request. curlhttpsrc was leaking the http_headers structure in this use case. The gst_curl_http_src_negotiate_caps() function extracts the "response-headers" field from the http_headers, but did not check that this field might be NULL. If the user-agent property is set, the global user-agent string was freed. This caused a double-free error if the user-agent is ever set a second time during the execution of the process. There are situations within curlhttpsrc where the code needs both the global multi_task_context mutex and the per-element buffer_mutex. To avoid deadlocks, it is vital that the order in which these are requested is always the same. This commit modifies the locking order to always be in the order: 1. multi_task_context.task_rec_mutex 2. buffer_mutex Fixes #876
2019-02-05 16:34:40 +00:00
g_mutex_unlock (&src->buffer_mutex);
GSTCURL_FUNCTION_EXIT (src);
return ret;
curl: Add curlhttpsrc element Merged from https://github.com/bbc/gst-curlhttpsrc commit f8aabcfc5c50a44f3362de831377d6e86dcd2d49 https://bugzilla.gnome.org/show_bug.cgi?id=744261
2017-07-25 14:23:57 +00:00
escape:
g_mutex_unlock (&src->buffer_mutex);
curlhttpsrc: fix various leaks and thread safety issues curlhttpsrc uses a single thread running the gst_curl_http_src_curl_multi_loop() function to handle receiving data and messages from libcurl. Each instance of curlhttpsrc adds an entry into a queue in GstCurlHttpSrcMultiTaskContext and waits for the multi_loop to perform the HTTP request. Valgrind has shown up race conditions and memory leaks: 1. gst_curl_http_src_change_state() does not wait for the multi_loop to complete before going to the NULL state, which means that an instance of GstCurlHttpSrc can be released while gst_curl_http_src_curl_multi_loop() still has a reference to it. 2. if multiple elements try to be removed from the queue at once, only the last one is deleted. 3. source->caps is leaked 4. curl multi_handle is leaked 5. leak of curl_handle if URI not set 6. leak of http_headers when reusing element 7. null pointer dereference in negotiate caps 8. double-free of the default user-agent string 9. leak of multi_task_context.task This commit changes the logic so that each element has a connection status, which is used by the multi_loop to decide when to remove an element from its queue. An instance of curlhttpsrc will not enter the NULL state until its reference has been removed from the queue. When shutting down the curl multi loop, the memory allocated from the call to curl_multi_init() is now released. When gstadaptivedemux uses a URI source element, it will re-use it for multiple requests, moving it between READY and PLAYING between each request. curlhttpsrc was leaking the http_headers structure in this use case. The gst_curl_http_src_negotiate_caps() function extracts the "response-headers" field from the http_headers, but did not check that this field might be NULL. If the user-agent property is set, the global user-agent string was freed. This caused a double-free error if the user-agent is ever set a second time during the execution of the process. There are situations within curlhttpsrc where the code needs both the global multi_task_context mutex and the per-element buffer_mutex. To avoid deadlocks, it is vital that the order in which these are requested is always the same. This commit modifies the locking order to always be in the order: 1. multi_task_context.task_rec_mutex 2. buffer_mutex Fixes #876
2019-02-05 16:34:40 +00:00
g_mutex_unlock (&klass->multi_task_context.mutex);
curl: Add curlhttpsrc element Merged from https://github.com/bbc/gst-curlhttpsrc commit f8aabcfc5c50a44f3362de831377d6e86dcd2d49 https://bugzilla.gnome.org/show_bug.cgi?id=744261
2017-07-25 14:23:57 +00:00
GSTCURL_FUNCTION_EXIT (src);
return ret;
}
/*
* Convert header from a GstStructure type to a curl_slist type that curl will
* understand.
*/
static gboolean
_headers_to_curl_slist (GQuark field_id, const GValue * value, gpointer ptr)
{
gchar *field;
struct curl_slist **p_slist = ptr;
field = g_strdup_printf ("%s: %s", g_quark_to_string (field_id),
g_value_get_string (value));
*p_slist = curl_slist_append (*p_slist, field);
g_free (field);
return TRUE;
}
/*
* From the data in the queue element s, create a CURL easy handle and populate
* options with the URL, proxy data, login options, cookies,
*/
static CURL *
gst_curl_http_src_create_easy_handle (GstCurlHttpSrc * s)
{
CURL *handle;
gint i;
GSTCURL_FUNCTION_ENTRY (s);
curlhttpsrc: fix various leaks and thread safety issues curlhttpsrc uses a single thread running the gst_curl_http_src_curl_multi_loop() function to handle receiving data and messages from libcurl. Each instance of curlhttpsrc adds an entry into a queue in GstCurlHttpSrcMultiTaskContext and waits for the multi_loop to perform the HTTP request. Valgrind has shown up race conditions and memory leaks: 1. gst_curl_http_src_change_state() does not wait for the multi_loop to complete before going to the NULL state, which means that an instance of GstCurlHttpSrc can be released while gst_curl_http_src_curl_multi_loop() still has a reference to it. 2. if multiple elements try to be removed from the queue at once, only the last one is deleted. 3. source->caps is leaked 4. curl multi_handle is leaked 5. leak of curl_handle if URI not set 6. leak of http_headers when reusing element 7. null pointer dereference in negotiate caps 8. double-free of the default user-agent string 9. leak of multi_task_context.task This commit changes the logic so that each element has a connection status, which is used by the multi_loop to decide when to remove an element from its queue. An instance of curlhttpsrc will not enter the NULL state until its reference has been removed from the queue. When shutting down the curl multi loop, the memory allocated from the call to curl_multi_init() is now released. When gstadaptivedemux uses a URI source element, it will re-use it for multiple requests, moving it between READY and PLAYING between each request. curlhttpsrc was leaking the http_headers structure in this use case. The gst_curl_http_src_negotiate_caps() function extracts the "response-headers" field from the http_headers, but did not check that this field might be NULL. If the user-agent property is set, the global user-agent string was freed. This caused a double-free error if the user-agent is ever set a second time during the execution of the process. There are situations within curlhttpsrc where the code needs both the global multi_task_context mutex and the per-element buffer_mutex. To avoid deadlocks, it is vital that the order in which these are requested is always the same. This commit modifies the locking order to always be in the order: 1. multi_task_context.task_rec_mutex 2. buffer_mutex Fixes #876
2019-02-05 16:34:40 +00:00
/* This is mandatory and yet not default option, so if this is NULL
* then something very bad is going on. */
if (s->uri == NULL) {
GST_ERROR_OBJECT (s, "No URI for curl!");
return NULL;
}
curl: Add curlhttpsrc element Merged from https://github.com/bbc/gst-curlhttpsrc commit f8aabcfc5c50a44f3362de831377d6e86dcd2d49 https://bugzilla.gnome.org/show_bug.cgi?id=744261
2017-07-25 14:23:57 +00:00
handle = curl_easy_init ();
if (handle == NULL) {
GST_ERROR_OBJECT (s, "Couldn't init a curl easy handle!");
return NULL;
}
GST_INFO_OBJECT (s, "Creating a new handle for URI %s", s->uri);
curlhttpsrc: Hook up libcurl logging message to gstreamer CURLOPT_DEBUGFUNCTION option replaces the standard debug function used when CURLOPT_VERBOSE is in effect. This callback receives various debug information.
2019-07-23 09:24:11 +00:00
#ifndef GST_DISABLE_GST_DEBUG
if (curl_easy_setopt (handle, CURLOPT_VERBOSE, 1) != CURLE_OK) {
GST_WARNING_OBJECT (s, "Failed to set verbose!");
}
if (curl_easy_setopt (handle, CURLOPT_DEBUGDATA, s) != CURLE_OK) {
GST_WARNING_OBJECT (s, "Failed to set debug user_data!");
}
if (curl_easy_setopt (handle, CURLOPT_DEBUGFUNCTION,
gst_curl_http_src_get_debug) != CURLE_OK) {
GST_WARNING_OBJECT (s, "Failed to set debug function!");
}
#endif
curlhttpsrc: Fix flagged Coverity errors Fixes CIDs 1415707 - 1415717
2017-07-26 16:06:17 +00:00
gst_curl_setopt_str (s, handle, CURLOPT_URL, s->uri);
curl: Add curlhttpsrc element Merged from https://github.com/bbc/gst-curlhttpsrc commit f8aabcfc5c50a44f3362de831377d6e86dcd2d49 https://bugzilla.gnome.org/show_bug.cgi?id=744261
2017-07-25 14:23:57 +00:00
gst_curl_setopt_str (s, handle, CURLOPT_USERNAME, s->username);
gst_curl_setopt_str (s, handle, CURLOPT_PASSWORD, s->password);
gst_curl_setopt_str (s, handle, CURLOPT_PROXY, s->proxy_uri);
gst_curl_setopt_str (s, handle, CURLOPT_NOPROXY, s->no_proxy_list);
gst_curl_setopt_str (s, handle, CURLOPT_PROXYUSERNAME, s->proxy_user);
gst_curl_setopt_str (s, handle, CURLOPT_PROXYPASSWORD, s->proxy_pass);
curlhttpsrc: Add curl anyauth option Add curl anyauth option to support http request to endpoints not using only basic authentication (as default in curl). Also aligning with curlhttpsink that already uses this option. Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/3824>
2023-01-27 11:45:10 +00:00
gst_curl_setopt_generic (s, handle, CURLOPT_HTTPAUTH, CURLAUTH_ANY);
curl: Add curlhttpsrc element Merged from https://github.com/bbc/gst-curlhttpsrc commit f8aabcfc5c50a44f3362de831377d6e86dcd2d49 https://bugzilla.gnome.org/show_bug.cgi?id=744261
2017-07-25 14:23:57 +00:00
for (i = 0; i < s->number_cookies; i++) {
gst_curl_setopt_str (s, handle, CURLOPT_COOKIELIST, s->cookies[i]);
}
/* curl_slist_append dynamically allocates memory, but I need to free it */
if (s->request_headers != NULL) {
gst_structure_foreach (s->request_headers, _headers_to_curl_slist,
&s->slist);
curlhttpsrc: Fix flagged Coverity errors Fixes CIDs 1415707 - 1415717
2017-07-26 16:06:17 +00:00
if (curl_easy_setopt (handle, CURLOPT_HTTPHEADER, s->slist) != CURLE_OK) {
GST_WARNING_OBJECT (s, "Failed to set HTTP headers!");
}
curl: Add curlhttpsrc element Merged from https://github.com/bbc/gst-curlhttpsrc commit f8aabcfc5c50a44f3362de831377d6e86dcd2d49 https://bugzilla.gnome.org/show_bug.cgi?id=744261
2017-07-25 14:23:57 +00:00
}
gst_curl_setopt_str_default (s, handle, CURLOPT_USERAGENT, s->user_agent);
/*
* Unlike soup, this isn't a binary op, curl wants a string here. So if it's
* TRUE, simply set the value as an empty string as this allows both gzip and
* zlib compression methods.
*/
if (s->accept_compressed_encodings == TRUE) {
curlhttpsrc: Fix flagged Coverity errors Fixes CIDs 1415707 - 1415717
2017-07-26 16:06:17 +00:00
gst_curl_setopt_str (s, handle, CURLOPT_ACCEPT_ENCODING, "");
curl: Add curlhttpsrc element Merged from https://github.com/bbc/gst-curlhttpsrc commit f8aabcfc5c50a44f3362de831377d6e86dcd2d49 https://bugzilla.gnome.org/show_bug.cgi?id=744261
2017-07-25 14:23:57 +00:00
} else {
curlhttpsrc: Fix flagged Coverity errors Fixes CIDs 1415707 - 1415717
2017-07-26 16:06:17 +00:00
gst_curl_setopt_str (s, handle, CURLOPT_ACCEPT_ENCODING, "identity");
curl: Add curlhttpsrc element Merged from https://github.com/bbc/gst-curlhttpsrc commit f8aabcfc5c50a44f3362de831377d6e86dcd2d49 https://bugzilla.gnome.org/show_bug.cgi?id=744261
2017-07-25 14:23:57 +00:00
}
gst_curl_setopt_int (s, handle, CURLOPT_FOLLOWLOCATION,
s->allow_3xx_redirect);
gst_curl_setopt_int_default (s, handle, CURLOPT_MAXREDIRS,
s->max_3xx_redirects);
curlhttpsrc: Fix flagged Coverity errors Fixes CIDs 1415707 - 1415717
2017-07-26 16:06:17 +00:00
gst_curl_setopt_bool (s, handle, CURLOPT_TCP_KEEPALIVE, s->keep_alive);
curl: Add curlhttpsrc element Merged from https://github.com/bbc/gst-curlhttpsrc commit f8aabcfc5c50a44f3362de831377d6e86dcd2d49 https://bugzilla.gnome.org/show_bug.cgi?id=744261
2017-07-25 14:23:57 +00:00
gst_curl_setopt_int (s, handle, CURLOPT_TIMEOUT, s->timeout_secs);
curlhttpsrc: Fix flagged Coverity errors Fixes CIDs 1415707 - 1415717
2017-07-26 16:06:17 +00:00
gst_curl_setopt_bool (s, handle, CURLOPT_SSL_VERIFYPEER, s->strict_ssl);
curl: Add curlhttpsrc element Merged from https://github.com/bbc/gst-curlhttpsrc commit f8aabcfc5c50a44f3362de831377d6e86dcd2d49 https://bugzilla.gnome.org/show_bug.cgi?id=744261
2017-07-25 14:23:57 +00:00
gst_curl_setopt_str (s, handle, CURLOPT_CAINFO, s->custom_ca_file);
curlhttpsrc: add support for range GET To allow curlhttpsrc to support DASH streams that use the on-demand profile, it needs to support HTTP Range GETs. In GStreamer, the RANGE is specified by issuing a GST_FORMAT_BYTES seek to set the start and end of the range. curlhttpsrc needs to implement seek and set the appropriate curl options to make it add the Range header to the request.
2019-05-24 16:33:33 +00:00
if (s->request_position || s->stop_position > 0) {
gchar *range;
if (s->stop_position < 1) {
/* start specified, no end specified */
range = g_strdup_printf ("%" G_GINT64_FORMAT "-", s->request_position);
} else {
/* in GStreamer the end position indicates the first byte that is not
in the range, whereas in HTTP the Content-Range header includes the
byte listed in the end value */
range = g_strdup_printf ("%" G_GINT64_FORMAT "-%" G_GINT64_FORMAT,
s->request_position, s->stop_position - 1);
}
GST_TRACE_OBJECT (s, "Requesting range: %s", range);
curl_easy_setopt (handle, CURLOPT_RANGE, range);
g_free (range);
}
curl: Add curlhttpsrc element Merged from https://github.com/bbc/gst-curlhttpsrc commit f8aabcfc5c50a44f3362de831377d6e86dcd2d49 https://bugzilla.gnome.org/show_bug.cgi?id=744261
2017-07-25 14:23:57 +00:00
switch (s->preferred_http_version) {
case GSTCURL_HTTP_VERSION_1_0:
GST_DEBUG_OBJECT (s, "Setting version as HTTP/1.0");
gst_curl_setopt_int (s, handle, CURLOPT_HTTP_VERSION,
CURL_HTTP_VERSION_1_0);
break;
case GSTCURL_HTTP_VERSION_1_1:
GST_DEBUG_OBJECT (s, "Setting version as HTTP/1.1");
gst_curl_setopt_int (s, handle, CURLOPT_HTTP_VERSION,
CURL_HTTP_VERSION_1_1);
break;
#ifdef CURL_VERSION_HTTP2
case GSTCURL_HTTP_VERSION_2_0:
GST_DEBUG_OBJECT (s, "Setting version as HTTP/2.0");
curlhttpsrc: Does version set fail because of HTTP2 Check to see if setting CURL_HTTP_VERSION_2_0 failed due to lack of HTTP/2 support or some bigger underlying libcurl failure https://bugzilla.gnome.org/show_bug.cgi?id=785878
2017-08-07 15:41:27 +00:00
if (curl_easy_setopt (handle, CURLOPT_HTTP_VERSION,
CURL_HTTP_VERSION_2_0) != CURLE_OK) {
if (gst_curl_http_src_curl_capabilities->features & CURL_VERSION_HTTP2) {
GST_WARNING_OBJECT (s,
"Cannot set unsupported option CURLOPT_HTTP_VERSION");
} else {
GST_INFO_OBJECT (s, "HTTP/2 unsupported by libcurl at this time");
}
}
curl: Add curlhttpsrc element Merged from https://github.com/bbc/gst-curlhttpsrc commit f8aabcfc5c50a44f3362de831377d6e86dcd2d49 https://bugzilla.gnome.org/show_bug.cgi?id=744261
2017-07-25 14:23:57 +00:00
break;
#endif
default:
GST_WARNING_OBJECT (s,
"Supplied a bogus HTTP version, using curl default!");
}
curlhttpsrc: Fix flagged Coverity errors Fixes CIDs 1415707 - 1415717
2017-07-26 16:06:17 +00:00
gst_curl_setopt_generic (s, handle, CURLOPT_HEADERFUNCTION,
curl: Add curlhttpsrc element Merged from https://github.com/bbc/gst-curlhttpsrc commit f8aabcfc5c50a44f3362de831377d6e86dcd2d49 https://bugzilla.gnome.org/show_bug.cgi?id=744261
2017-07-25 14:23:57 +00:00
gst_curl_http_src_get_header);
curlhttpsrc: Fix flagged Coverity errors Fixes CIDs 1415707 - 1415717
2017-07-26 16:06:17 +00:00
gst_curl_setopt_str (s, handle, CURLOPT_HEADERDATA, s);
gst_curl_setopt_generic (s, handle, CURLOPT_WRITEFUNCTION,
curl: Add curlhttpsrc element Merged from https://github.com/bbc/gst-curlhttpsrc commit f8aabcfc5c50a44f3362de831377d6e86dcd2d49 https://bugzilla.gnome.org/show_bug.cgi?id=744261
2017-07-25 14:23:57 +00:00
gst_curl_http_src_get_chunks);
curlhttpsrc: Fix flagged Coverity errors Fixes CIDs 1415707 - 1415717
2017-07-26 16:06:17 +00:00
gst_curl_setopt_str (s, handle, CURLOPT_WRITEDATA, s);
curl: Add curlhttpsrc element Merged from https://github.com/bbc/gst-curlhttpsrc commit f8aabcfc5c50a44f3362de831377d6e86dcd2d49 https://bugzilla.gnome.org/show_bug.cgi?id=744261
2017-07-25 14:23:57 +00:00
curlhttpsrc: Fix flagged Coverity errors Fixes CIDs 1415707 - 1415717
2017-07-26 16:06:17 +00:00
gst_curl_setopt_str (s, handle, CURLOPT_ERRORBUFFER, s->curl_errbuf);
curl: Add curlhttpsrc element Merged from https://github.com/bbc/gst-curlhttpsrc commit f8aabcfc5c50a44f3362de831377d6e86dcd2d49 https://bugzilla.gnome.org/show_bug.cgi?id=744261
2017-07-25 14:23:57 +00:00
GSTCURL_FUNCTION_EXIT (s);
return handle;
}
/*
* Check the return type from the curl transfer. If it was okay, then deal with
* any headers that were received. Headers should only be dealt with once - but
* we might get a second set if there are trailing headers (RFC7230 Section 4.4)
*/
static GstFlowReturn
gst_curl_http_src_handle_response (GstCurlHttpSrc * src)
{
glong curl_info_long;
gdouble curl_info_dbl;
curlhttpsrc: add support for range GET To allow curlhttpsrc to support DASH streams that use the on-demand profile, it needs to support HTTP Range GETs. In GStreamer, the RANGE is specified by issuing a GST_FORMAT_BYTES seek to set the start and end of the range. curlhttpsrc needs to implement seek and set the appropriate curl options to make it add the Range header to the request.
2019-05-24 16:33:33 +00:00
curl_off_t curl_info_offt;
curl: Add curlhttpsrc element Merged from https://github.com/bbc/gst-curlhttpsrc commit f8aabcfc5c50a44f3362de831377d6e86dcd2d49 https://bugzilla.gnome.org/show_bug.cgi?id=744261
2017-07-25 14:23:57 +00:00
gchar *redirect_url;
GstBaseSrc *basesrc;
const GValue *response_headers;
GstFlowReturn ret = GST_FLOW_OK;
GSTCURL_FUNCTION_ENTRY (src);
curlhttpsrc: export same HTTP error status as souphttpsrc To make it closer to a drop-in replacement for souphttpsrc, expose the same gst_error_message_with_details as souphttpsrc, so that applications can received the HTTP status code and reason when an error occurs.
2019-02-05 17:06:50 +00:00
GST_TRACE_OBJECT (src, "status code: %d (%s), curl return code %d",
src->status_code, src->reason_phrase, src->curl_result);
curl: Add curlhttpsrc element Merged from https://github.com/bbc/gst-curlhttpsrc commit f8aabcfc5c50a44f3362de831377d6e86dcd2d49 https://bugzilla.gnome.org/show_bug.cgi?id=744261
2017-07-25 14:23:57 +00:00
/* Check the curl result code first - anything not 0 is probably a failure */
if (src->curl_result != 0) {
GST_WARNING_OBJECT (src, "Curl failed the transfer (%d): %s",
src->curl_result, curl_easy_strerror (src->curl_result));
GST_DEBUG_OBJECT (src, "Reason for curl failure: %s", src->curl_errbuf);
return GST_FLOW_ERROR;
}
/*
* What response code do we have?
*/
if (src->status_code >= 400) {
GST_WARNING_OBJECT (src, "Transfer for URI %s returned error status %u",
src->uri, src->status_code);
src->retries_remaining = 0;
curlhttpsrc: export same HTTP error status as souphttpsrc To make it closer to a drop-in replacement for souphttpsrc, expose the same gst_error_message_with_details as souphttpsrc, so that applications can received the HTTP status code and reason when an error occurs.
2019-02-05 17:06:50 +00:00
CURL_HTTP_SRC_ERROR (src, RESOURCE, NOT_FOUND, (src->reason_phrase));
curl: Add curlhttpsrc element Merged from https://github.com/bbc/gst-curlhttpsrc commit f8aabcfc5c50a44f3362de831377d6e86dcd2d49 https://bugzilla.gnome.org/show_bug.cgi?id=744261
2017-07-25 14:23:57 +00:00
return GST_FLOW_ERROR;
} else if (src->status_code == 0) {
if (curl_easy_getinfo (src->curl_handle, CURLINFO_TOTAL_TIME,
&curl_info_dbl) != CURLE_OK) {
/* Curl cannot be relied on in this state, so return an error. */
return GST_FLOW_ERROR;
}
if (curl_info_dbl > src->timeout_secs) {
return GST_FLOW_CUSTOM_ERROR;
}
if (curl_easy_getinfo (src->curl_handle, CURLINFO_OS_ERRNO,
&curl_info_long) != CURLE_OK) {
/* Curl cannot be relied on in this state, so return an error. */
return GST_FLOW_ERROR;
}
GST_WARNING_OBJECT (src, "Errno for CONNECT call was %ld (%s)",
curl_info_long, g_strerror ((gint) curl_info_long));
/* Some of these responses are retry-able, others not. Set the returned
* state to ERROR so we crash out instead of fruitlessly retrying.
*/
if (curl_info_long == ECONNREFUSED) {
return GST_FLOW_ERROR;
}
ret = GST_FLOW_CUSTOM_ERROR;
}
if (ret == GST_FLOW_CUSTOM_ERROR) {
src->hdrs_updated = FALSE;
GSTCURL_FUNCTION_EXIT (src);
return ret;
}
/* Only do this once */
if (src->hdrs_updated == FALSE) {
GSTCURL_FUNCTION_EXIT (src);
return GST_FLOW_OK;
}
/*
* Deal with redirections...
*/
if (curl_easy_getinfo (src->curl_handle, CURLINFO_EFFECTIVE_URL,
&redirect_url)
== CURLE_OK) {
size_t lena, lenb;
lena = strlen (src->uri);
lenb = strlen (redirect_url);
if (g_ascii_strncasecmp (src->uri, redirect_url,
(lena > lenb) ? lenb : lena) != 0) {
GST_INFO_OBJECT (src, "Got a redirect to %s, setting as redirect URI",
redirect_url);
src->redirect_uri = g_strdup (redirect_url);
gst_structure_remove_field (src->http_headers, REDIRECT_URI_NAME);
gst_structure_set (src->http_headers, REDIRECT_URI_NAME,
G_TYPE_STRING, redirect_url, NULL);
}
}
/*
* Push the content length
*/
curlhttpsrc: add support for range GET To allow curlhttpsrc to support DASH streams that use the on-demand profile, it needs to support HTTP Range GETs. In GStreamer, the RANGE is specified by issuing a GST_FORMAT_BYTES seek to set the start and end of the range. curlhttpsrc needs to implement seek and set the appropriate curl options to make it add the Range header to the request.
2019-05-24 16:33:33 +00:00
if (curl_easy_getinfo (src->curl_handle, CURLINFO_CONTENT_LENGTH_DOWNLOAD_T,
&curl_info_offt) == CURLE_OK) {
if (curl_info_offt == -1) {
curl: Add curlhttpsrc element Merged from https://github.com/bbc/gst-curlhttpsrc commit f8aabcfc5c50a44f3362de831377d6e86dcd2d49 https://bugzilla.gnome.org/show_bug.cgi?id=744261
2017-07-25 14:23:57 +00:00
GST_WARNING_OBJECT (src,
"No Content-Length was specified in the response.");
curlhttpsrc: add support for range GET To allow curlhttpsrc to support DASH streams that use the on-demand profile, it needs to support HTTP Range GETs. In GStreamer, the RANGE is specified by issuing a GST_FORMAT_BYTES seek to set the start and end of the range. curlhttpsrc needs to implement seek and set the appropriate curl options to make it add the Range header to the request.
2019-05-24 16:33:33 +00:00
src->seekable = GSTCURL_SEEKABLE_FALSE;
curl: Add curlhttpsrc element Merged from https://github.com/bbc/gst-curlhttpsrc commit f8aabcfc5c50a44f3362de831377d6e86dcd2d49 https://bugzilla.gnome.org/show_bug.cgi?id=744261
2017-07-25 14:23:57 +00:00
} else {
curlhttpsrc: add support for range GET To allow curlhttpsrc to support DASH streams that use the on-demand profile, it needs to support HTTP Range GETs. In GStreamer, the RANGE is specified by issuing a GST_FORMAT_BYTES seek to set the start and end of the range. curlhttpsrc needs to implement seek and set the appropriate curl options to make it add the Range header to the request.
2019-05-24 16:33:33 +00:00
/* Note that in the case of a range get, Content-Length is the number
of bytes requested, not the total size of the resource */
GST_INFO_OBJECT (src, "Content-Length was given as %" G_GUINT64_FORMAT,
curl_info_offt);
if (src->content_size == 0) {
src->content_size = src->request_position + curl_info_offt;
}
curl: Add curlhttpsrc element Merged from https://github.com/bbc/gst-curlhttpsrc commit f8aabcfc5c50a44f3362de831377d6e86dcd2d49 https://bugzilla.gnome.org/show_bug.cgi?id=744261
2017-07-25 14:23:57 +00:00
basesrc = GST_BASE_SRC_CAST (src);
curlhttpsrc: add support for range GET To allow curlhttpsrc to support DASH streams that use the on-demand profile, it needs to support HTTP Range GETs. In GStreamer, the RANGE is specified by issuing a GST_FORMAT_BYTES seek to set the start and end of the range. curlhttpsrc needs to implement seek and set the appropriate curl options to make it add the Range header to the request.
2019-05-24 16:33:33 +00:00
basesrc->segment.duration = src->request_position + curl_info_offt;
if (src->seekable == GSTCURL_SEEKABLE_UNKNOWN) {
src->seekable = GSTCURL_SEEKABLE_TRUE;
}
curl: Add curlhttpsrc element Merged from https://github.com/bbc/gst-curlhttpsrc commit f8aabcfc5c50a44f3362de831377d6e86dcd2d49 https://bugzilla.gnome.org/show_bug.cgi?id=744261
2017-07-25 14:23:57 +00:00
gst_element_post_message (GST_ELEMENT (src),
gst_message_new_duration_changed (GST_OBJECT (src)));
}
}
/*
* Push all the received headers down via a sicky event
*/
response_headers = gst_structure_get_value (src->http_headers,
RESPONSE_HEADERS_NAME);
if (gst_structure_n_fields (gst_value_get_structure (response_headers)) > 0) {
GstEvent *hdrs_event;
gst_element_post_message (GST_ELEMENT_CAST (src),
gst_message_new_element (GST_OBJECT_CAST (src),
gst_structure_copy (src->http_headers)));
/* gst_event_new_custom takes ownership of our structure */
hdrs_event = gst_event_new_custom (GST_EVENT_CUSTOM_DOWNSTREAM_STICKY,
curlhttpsrc: fix various leaks and thread safety issues curlhttpsrc uses a single thread running the gst_curl_http_src_curl_multi_loop() function to handle receiving data and messages from libcurl. Each instance of curlhttpsrc adds an entry into a queue in GstCurlHttpSrcMultiTaskContext and waits for the multi_loop to perform the HTTP request. Valgrind has shown up race conditions and memory leaks: 1. gst_curl_http_src_change_state() does not wait for the multi_loop to complete before going to the NULL state, which means that an instance of GstCurlHttpSrc can be released while gst_curl_http_src_curl_multi_loop() still has a reference to it. 2. if multiple elements try to be removed from the queue at once, only the last one is deleted. 3. source->caps is leaked 4. curl multi_handle is leaked 5. leak of curl_handle if URI not set 6. leak of http_headers when reusing element 7. null pointer dereference in negotiate caps 8. double-free of the default user-agent string 9. leak of multi_task_context.task This commit changes the logic so that each element has a connection status, which is used by the multi_loop to decide when to remove an element from its queue. An instance of curlhttpsrc will not enter the NULL state until its reference has been removed from the queue. When shutting down the curl multi loop, the memory allocated from the call to curl_multi_init() is now released. When gstadaptivedemux uses a URI source element, it will re-use it for multiple requests, moving it between READY and PLAYING between each request. curlhttpsrc was leaking the http_headers structure in this use case. The gst_curl_http_src_negotiate_caps() function extracts the "response-headers" field from the http_headers, but did not check that this field might be NULL. If the user-agent property is set, the global user-agent string was freed. This caused a double-free error if the user-agent is ever set a second time during the execution of the process. There are situations within curlhttpsrc where the code needs both the global multi_task_context mutex and the per-element buffer_mutex. To avoid deadlocks, it is vital that the order in which these are requested is always the same. This commit modifies the locking order to always be in the order: 1. multi_task_context.task_rec_mutex 2. buffer_mutex Fixes #876
2019-02-05 16:34:40 +00:00
gst_structure_copy (src->http_headers));
curl: Add curlhttpsrc element Merged from https://github.com/bbc/gst-curlhttpsrc commit f8aabcfc5c50a44f3362de831377d6e86dcd2d49 https://bugzilla.gnome.org/show_bug.cgi?id=744261
2017-07-25 14:23:57 +00:00
gst_pad_push_event (GST_BASE_SRC_PAD (src), hdrs_event);
GST_INFO_OBJECT (src, "Pushed headers downstream");
}
src->hdrs_updated = FALSE;
GSTCURL_FUNCTION_EXIT (src);
return ret;
}
/*
* "Negotiate" capabilities between us and the sink.
* I.e. tell the sink device what data to expect. We can't be told what to send
* unless we implement "only return to me if this type" property. Potential TODO
*/
static gboolean
gst_curl_http_src_negotiate_caps (GstCurlHttpSrc * src)
{
curlhttpsrc: fix various leaks and thread safety issues curlhttpsrc uses a single thread running the gst_curl_http_src_curl_multi_loop() function to handle receiving data and messages from libcurl. Each instance of curlhttpsrc adds an entry into a queue in GstCurlHttpSrcMultiTaskContext and waits for the multi_loop to perform the HTTP request. Valgrind has shown up race conditions and memory leaks: 1. gst_curl_http_src_change_state() does not wait for the multi_loop to complete before going to the NULL state, which means that an instance of GstCurlHttpSrc can be released while gst_curl_http_src_curl_multi_loop() still has a reference to it. 2. if multiple elements try to be removed from the queue at once, only the last one is deleted. 3. source->caps is leaked 4. curl multi_handle is leaked 5. leak of curl_handle if URI not set 6. leak of http_headers when reusing element 7. null pointer dereference in negotiate caps 8. double-free of the default user-agent string 9. leak of multi_task_context.task This commit changes the logic so that each element has a connection status, which is used by the multi_loop to decide when to remove an element from its queue. An instance of curlhttpsrc will not enter the NULL state until its reference has been removed from the queue. When shutting down the curl multi loop, the memory allocated from the call to curl_multi_init() is now released. When gstadaptivedemux uses a URI source element, it will re-use it for multiple requests, moving it between READY and PLAYING between each request. curlhttpsrc was leaking the http_headers structure in this use case. The gst_curl_http_src_negotiate_caps() function extracts the "response-headers" field from the http_headers, but did not check that this field might be NULL. If the user-agent property is set, the global user-agent string was freed. This caused a double-free error if the user-agent is ever set a second time during the execution of the process. There are situations within curlhttpsrc where the code needs both the global multi_task_context mutex and the per-element buffer_mutex. To avoid deadlocks, it is vital that the order in which these are requested is always the same. This commit modifies the locking order to always be in the order: 1. multi_task_context.task_rec_mutex 2. buffer_mutex Fixes #876
2019-02-05 16:34:40 +00:00
const GValue *response_headers;
const GstStructure *response_struct;
curl: Add curlhttpsrc element Merged from https://github.com/bbc/gst-curlhttpsrc commit f8aabcfc5c50a44f3362de831377d6e86dcd2d49 https://bugzilla.gnome.org/show_bug.cgi?id=744261
2017-07-25 14:23:57 +00:00
GST_INFO_OBJECT (src, "Negotiating caps...");
if (src->caps && src->http_headers) {
curlhttpsrc: fix various leaks and thread safety issues curlhttpsrc uses a single thread running the gst_curl_http_src_curl_multi_loop() function to handle receiving data and messages from libcurl. Each instance of curlhttpsrc adds an entry into a queue in GstCurlHttpSrcMultiTaskContext and waits for the multi_loop to perform the HTTP request. Valgrind has shown up race conditions and memory leaks: 1. gst_curl_http_src_change_state() does not wait for the multi_loop to complete before going to the NULL state, which means that an instance of GstCurlHttpSrc can be released while gst_curl_http_src_curl_multi_loop() still has a reference to it. 2. if multiple elements try to be removed from the queue at once, only the last one is deleted. 3. source->caps is leaked 4. curl multi_handle is leaked 5. leak of curl_handle if URI not set 6. leak of http_headers when reusing element 7. null pointer dereference in negotiate caps 8. double-free of the default user-agent string 9. leak of multi_task_context.task This commit changes the logic so that each element has a connection status, which is used by the multi_loop to decide when to remove an element from its queue. An instance of curlhttpsrc will not enter the NULL state until its reference has been removed from the queue. When shutting down the curl multi loop, the memory allocated from the call to curl_multi_init() is now released. When gstadaptivedemux uses a URI source element, it will re-use it for multiple requests, moving it between READY and PLAYING between each request. curlhttpsrc was leaking the http_headers structure in this use case. The gst_curl_http_src_negotiate_caps() function extracts the "response-headers" field from the http_headers, but did not check that this field might be NULL. If the user-agent property is set, the global user-agent string was freed. This caused a double-free error if the user-agent is ever set a second time during the execution of the process. There are situations within curlhttpsrc where the code needs both the global multi_task_context mutex and the per-element buffer_mutex. To avoid deadlocks, it is vital that the order in which these are requested is always the same. This commit modifies the locking order to always be in the order: 1. multi_task_context.task_rec_mutex 2. buffer_mutex Fixes #876
2019-02-05 16:34:40 +00:00
response_headers =
gst_structure_get_value (src->http_headers, RESPONSE_HEADERS_NAME);
if (!response_headers) {
GST_WARNING_OBJECT (src, "Failed to get %s", RESPONSE_HEADERS_NAME);
return FALSE;
}
response_struct = gst_value_get_structure (response_headers);
if (gst_structure_has_field_typed (response_struct, "content-type",
G_TYPE_STRING)) {
const gchar *content_type =
gst_structure_get_string (response_struct, "content-type");
GST_INFO_OBJECT (src, "Setting caps as Content-Type of %s", content_type);
src->caps = gst_caps_make_writable (src->caps);
gst_caps_set_simple (src->caps, "content-type", G_TYPE_STRING,
content_type, NULL);
if (gst_base_src_set_caps (GST_BASE_SRC (src), src->caps) != TRUE) {
GST_ERROR_OBJECT (src, "Setting caps failed!");
curl: Add curlhttpsrc element Merged from https://github.com/bbc/gst-curlhttpsrc commit f8aabcfc5c50a44f3362de831377d6e86dcd2d49 https://bugzilla.gnome.org/show_bug.cgi?id=744261
2017-07-25 14:23:57 +00:00
return FALSE;
}
}
} else {
GST_DEBUG_OBJECT (src, "No caps have been set, continue.");
}
return TRUE;
}
/*
* Cleanup the CURL easy handle once we're done with it.
*/
static inline void
gst_curl_http_src_destroy_easy_handle (GstCurlHttpSrc * src)
{
/* Thank you Handles, and well done. Well done, mate. */
if (src->curl_handle != NULL) {
curl_easy_cleanup (src->curl_handle);
src->curl_handle = NULL;
}
/* In addition, clean up the curl header slist if it was used. */
if (src->slist != NULL) {
curl_slist_free_all (src->slist);
src->slist = NULL;
}
}
static GstStateChangeReturn
gst_curl_http_src_change_state (GstElement * element, GstStateChange transition)
{
GstStateChangeReturn ret;
GstCurlHttpSrc *source = GST_CURLHTTPSRC (element);
GSTCURL_FUNCTION_ENTRY (source);
switch (transition) {
case GST_STATE_CHANGE_NULL_TO_READY:
gst_curl_http_src_ref_multi (source);
break;
curlhttpsrc: Don't switch to PAUSED if not URI was specified Like for other sources
2017-11-21 14:31:05 +00:00
case GST_STATE_CHANGE_READY_TO_PAUSED:
curlhttpsrc: Post an error message if no URI was set Like for other sources
2017-11-21 15:30:35 +00:00
if (source->uri == NULL) {
GST_ELEMENT_ERROR (element, RESOURCE, OPEN_READ, (_("No URL set.")),
("Missing URL"));
curlhttpsrc: Don't switch to PAUSED if not URI was specified Like for other sources
2017-11-21 14:31:05 +00:00
return GST_STATE_CHANGE_FAILURE;
curlhttpsrc: Post an error message if no URI was set Like for other sources
2017-11-21 15:30:35 +00:00
}
curlhttpsrc: Don't switch to PAUSED if not URI was specified Like for other sources
2017-11-21 14:31:05 +00:00
break;
curl: Add curlhttpsrc element Merged from https://github.com/bbc/gst-curlhttpsrc commit f8aabcfc5c50a44f3362de831377d6e86dcd2d49 https://bugzilla.gnome.org/show_bug.cgi?id=744261
2017-07-25 14:23:57 +00:00
case GST_STATE_CHANGE_READY_TO_NULL:
curlhttpsrc: fix various leaks and thread safety issues curlhttpsrc uses a single thread running the gst_curl_http_src_curl_multi_loop() function to handle receiving data and messages from libcurl. Each instance of curlhttpsrc adds an entry into a queue in GstCurlHttpSrcMultiTaskContext and waits for the multi_loop to perform the HTTP request. Valgrind has shown up race conditions and memory leaks: 1. gst_curl_http_src_change_state() does not wait for the multi_loop to complete before going to the NULL state, which means that an instance of GstCurlHttpSrc can be released while gst_curl_http_src_curl_multi_loop() still has a reference to it. 2. if multiple elements try to be removed from the queue at once, only the last one is deleted. 3. source->caps is leaked 4. curl multi_handle is leaked 5. leak of curl_handle if URI not set 6. leak of http_headers when reusing element 7. null pointer dereference in negotiate caps 8. double-free of the default user-agent string 9. leak of multi_task_context.task This commit changes the logic so that each element has a connection status, which is used by the multi_loop to decide when to remove an element from its queue. An instance of curlhttpsrc will not enter the NULL state until its reference has been removed from the queue. When shutting down the curl multi loop, the memory allocated from the call to curl_multi_init() is now released. When gstadaptivedemux uses a URI source element, it will re-use it for multiple requests, moving it between READY and PLAYING between each request. curlhttpsrc was leaking the http_headers structure in this use case. The gst_curl_http_src_negotiate_caps() function extracts the "response-headers" field from the http_headers, but did not check that this field might be NULL. If the user-agent property is set, the global user-agent string was freed. This caused a double-free error if the user-agent is ever set a second time during the execution of the process. There are situations within curlhttpsrc where the code needs both the global multi_task_context mutex and the per-element buffer_mutex. To avoid deadlocks, it is vital that the order in which these are requested is always the same. This commit modifies the locking order to always be in the order: 1. multi_task_context.task_rec_mutex 2. buffer_mutex Fixes #876
2019-02-05 16:34:40 +00:00
GST_DEBUG_OBJECT (source, "Removing from multi_loop queue...");
/* The pipeline has ended, so signal any running request to end
and wait until the multi_loop has stopped using this element */
gst_curl_http_src_wait_until_removed (source);
curl: Add curlhttpsrc element Merged from https://github.com/bbc/gst-curlhttpsrc commit f8aabcfc5c50a44f3362de831377d6e86dcd2d49 https://bugzilla.gnome.org/show_bug.cgi?id=744261
2017-07-25 14:23:57 +00:00
gst_curl_http_src_unref_multi (source);
break;
default:
break;
}
ret = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
GSTCURL_FUNCTION_EXIT (source);
return ret;
}
/*
* Take care of any memory that may be left over from the instance that's now
* closing before we leak it.
*/
static void
gst_curl_http_src_cleanup_instance (GstCurlHttpSrc * src)
{
gint i;
g_mutex_lock (&src->uri_mutex);
g_free (src->uri);
src->uri = NULL;
g_free (src->redirect_uri);
src->redirect_uri = NULL;
g_mutex_unlock (&src->uri_mutex);
g_mutex_clear (&src->uri_mutex);
g_free (src->proxy_uri);
src->proxy_uri = NULL;
g_free (src->no_proxy_list);
src->no_proxy_list = NULL;
g_free (src->proxy_user);
src->proxy_user = NULL;
g_free (src->proxy_pass);
src->proxy_pass = NULL;
for (i = 0; i < src->number_cookies; i++) {
g_free (src->cookies[i]);
src->cookies[i] = NULL;
}
g_free (src->cookies);
src->cookies = NULL;
curlhttpsrc: fix various leaks and thread safety issues curlhttpsrc uses a single thread running the gst_curl_http_src_curl_multi_loop() function to handle receiving data and messages from libcurl. Each instance of curlhttpsrc adds an entry into a queue in GstCurlHttpSrcMultiTaskContext and waits for the multi_loop to perform the HTTP request. Valgrind has shown up race conditions and memory leaks: 1. gst_curl_http_src_change_state() does not wait for the multi_loop to complete before going to the NULL state, which means that an instance of GstCurlHttpSrc can be released while gst_curl_http_src_curl_multi_loop() still has a reference to it. 2. if multiple elements try to be removed from the queue at once, only the last one is deleted. 3. source->caps is leaked 4. curl multi_handle is leaked 5. leak of curl_handle if URI not set 6. leak of http_headers when reusing element 7. null pointer dereference in negotiate caps 8. double-free of the default user-agent string 9. leak of multi_task_context.task This commit changes the logic so that each element has a connection status, which is used by the multi_loop to decide when to remove an element from its queue. An instance of curlhttpsrc will not enter the NULL state until its reference has been removed from the queue. When shutting down the curl multi loop, the memory allocated from the call to curl_multi_init() is now released. When gstadaptivedemux uses a URI source element, it will re-use it for multiple requests, moving it between READY and PLAYING between each request. curlhttpsrc was leaking the http_headers structure in this use case. The gst_curl_http_src_negotiate_caps() function extracts the "response-headers" field from the http_headers, but did not check that this field might be NULL. If the user-agent property is set, the global user-agent string was freed. This caused a double-free error if the user-agent is ever set a second time during the execution of the process. There are situations within curlhttpsrc where the code needs both the global multi_task_context mutex and the per-element buffer_mutex. To avoid deadlocks, it is vital that the order in which these are requested is always the same. This commit modifies the locking order to always be in the order: 1. multi_task_context.task_rec_mutex 2. buffer_mutex Fixes #876
2019-02-05 16:34:40 +00:00
g_free (src->user_agent);
src->user_agent = NULL;
curl: Add curlhttpsrc element Merged from https://github.com/bbc/gst-curlhttpsrc commit f8aabcfc5c50a44f3362de831377d6e86dcd2d49 https://bugzilla.gnome.org/show_bug.cgi?id=744261
2017-07-25 14:23:57 +00:00
g_mutex_clear (&src->buffer_mutex);
curlhttpsrc: fix various leaks and thread safety issues curlhttpsrc uses a single thread running the gst_curl_http_src_curl_multi_loop() function to handle receiving data and messages from libcurl. Each instance of curlhttpsrc adds an entry into a queue in GstCurlHttpSrcMultiTaskContext and waits for the multi_loop to perform the HTTP request. Valgrind has shown up race conditions and memory leaks: 1. gst_curl_http_src_change_state() does not wait for the multi_loop to complete before going to the NULL state, which means that an instance of GstCurlHttpSrc can be released while gst_curl_http_src_curl_multi_loop() still has a reference to it. 2. if multiple elements try to be removed from the queue at once, only the last one is deleted. 3. source->caps is leaked 4. curl multi_handle is leaked 5. leak of curl_handle if URI not set 6. leak of http_headers when reusing element 7. null pointer dereference in negotiate caps 8. double-free of the default user-agent string 9. leak of multi_task_context.task This commit changes the logic so that each element has a connection status, which is used by the multi_loop to decide when to remove an element from its queue. An instance of curlhttpsrc will not enter the NULL state until its reference has been removed from the queue. When shutting down the curl multi loop, the memory allocated from the call to curl_multi_init() is now released. When gstadaptivedemux uses a URI source element, it will re-use it for multiple requests, moving it between READY and PLAYING between each request. curlhttpsrc was leaking the http_headers structure in this use case. The gst_curl_http_src_negotiate_caps() function extracts the "response-headers" field from the http_headers, but did not check that this field might be NULL. If the user-agent property is set, the global user-agent string was freed. This caused a double-free error if the user-agent is ever set a second time during the execution of the process. There are situations within curlhttpsrc where the code needs both the global multi_task_context mutex and the per-element buffer_mutex. To avoid deadlocks, it is vital that the order in which these are requested is always the same. This commit modifies the locking order to always be in the order: 1. multi_task_context.task_rec_mutex 2. buffer_mutex Fixes #876
2019-02-05 16:34:40 +00:00
g_cond_clear (&src->buffer_cond);
curl: Add curlhttpsrc element Merged from https://github.com/bbc/gst-curlhttpsrc commit f8aabcfc5c50a44f3362de831377d6e86dcd2d49 https://bugzilla.gnome.org/show_bug.cgi?id=744261
2017-07-25 14:23:57 +00:00
g_free (src->buffer);
src->buffer = NULL;
curlhttpsrc: fix various leaks and thread safety issues curlhttpsrc uses a single thread running the gst_curl_http_src_curl_multi_loop() function to handle receiving data and messages from libcurl. Each instance of curlhttpsrc adds an entry into a queue in GstCurlHttpSrcMultiTaskContext and waits for the multi_loop to perform the HTTP request. Valgrind has shown up race conditions and memory leaks: 1. gst_curl_http_src_change_state() does not wait for the multi_loop to complete before going to the NULL state, which means that an instance of GstCurlHttpSrc can be released while gst_curl_http_src_curl_multi_loop() still has a reference to it. 2. if multiple elements try to be removed from the queue at once, only the last one is deleted. 3. source->caps is leaked 4. curl multi_handle is leaked 5. leak of curl_handle if URI not set 6. leak of http_headers when reusing element 7. null pointer dereference in negotiate caps 8. double-free of the default user-agent string 9. leak of multi_task_context.task This commit changes the logic so that each element has a connection status, which is used by the multi_loop to decide when to remove an element from its queue. An instance of curlhttpsrc will not enter the NULL state until its reference has been removed from the queue. When shutting down the curl multi loop, the memory allocated from the call to curl_multi_init() is now released. When gstadaptivedemux uses a URI source element, it will re-use it for multiple requests, moving it between READY and PLAYING between each request. curlhttpsrc was leaking the http_headers structure in this use case. The gst_curl_http_src_negotiate_caps() function extracts the "response-headers" field from the http_headers, but did not check that this field might be NULL. If the user-agent property is set, the global user-agent string was freed. This caused a double-free error if the user-agent is ever set a second time during the execution of the process. There are situations within curlhttpsrc where the code needs both the global multi_task_context mutex and the per-element buffer_mutex. To avoid deadlocks, it is vital that the order in which these are requested is always the same. This commit modifies the locking order to always be in the order: 1. multi_task_context.task_rec_mutex 2. buffer_mutex Fixes #876
2019-02-05 16:34:40 +00:00
if (src->request_headers) {
gst_structure_free (src->request_headers);
src->request_headers = NULL;
}
curl: Add curlhttpsrc element Merged from https://github.com/bbc/gst-curlhttpsrc commit f8aabcfc5c50a44f3362de831377d6e86dcd2d49 https://bugzilla.gnome.org/show_bug.cgi?id=744261
2017-07-25 14:23:57 +00:00
if (src->http_headers != NULL) {
gst_structure_free (src->http_headers);
src->http_headers = NULL;
}
curlhttpsrc: export same HTTP error status as souphttpsrc To make it closer to a drop-in replacement for souphttpsrc, expose the same gst_error_message_with_details as souphttpsrc, so that applications can received the HTTP status code and reason when an error occurs.
2019-02-05 17:06:50 +00:00
g_free (src->reason_phrase);
src->reason_phrase = NULL;
curlhttpsrc: fix various leaks and thread safety issues curlhttpsrc uses a single thread running the gst_curl_http_src_curl_multi_loop() function to handle receiving data and messages from libcurl. Each instance of curlhttpsrc adds an entry into a queue in GstCurlHttpSrcMultiTaskContext and waits for the multi_loop to perform the HTTP request. Valgrind has shown up race conditions and memory leaks: 1. gst_curl_http_src_change_state() does not wait for the multi_loop to complete before going to the NULL state, which means that an instance of GstCurlHttpSrc can be released while gst_curl_http_src_curl_multi_loop() still has a reference to it. 2. if multiple elements try to be removed from the queue at once, only the last one is deleted. 3. source->caps is leaked 4. curl multi_handle is leaked 5. leak of curl_handle if URI not set 6. leak of http_headers when reusing element 7. null pointer dereference in negotiate caps 8. double-free of the default user-agent string 9. leak of multi_task_context.task This commit changes the logic so that each element has a connection status, which is used by the multi_loop to decide when to remove an element from its queue. An instance of curlhttpsrc will not enter the NULL state until its reference has been removed from the queue. When shutting down the curl multi loop, the memory allocated from the call to curl_multi_init() is now released. When gstadaptivedemux uses a URI source element, it will re-use it for multiple requests, moving it between READY and PLAYING between each request. curlhttpsrc was leaking the http_headers structure in this use case. The gst_curl_http_src_negotiate_caps() function extracts the "response-headers" field from the http_headers, but did not check that this field might be NULL. If the user-agent property is set, the global user-agent string was freed. This caused a double-free error if the user-agent is ever set a second time during the execution of the process. There are situations within curlhttpsrc where the code needs both the global multi_task_context mutex and the per-element buffer_mutex. To avoid deadlocks, it is vital that the order in which these are requested is always the same. This commit modifies the locking order to always be in the order: 1. multi_task_context.task_rec_mutex 2. buffer_mutex Fixes #876
2019-02-05 16:34:40 +00:00
gst_caps_replace (&src->caps, NULL);
curl: Add curlhttpsrc element Merged from https://github.com/bbc/gst-curlhttpsrc commit f8aabcfc5c50a44f3362de831377d6e86dcd2d49 https://bugzilla.gnome.org/show_bug.cgi?id=744261
2017-07-25 14:23:57 +00:00
gst_curl_http_src_destroy_easy_handle (src);
}
static gboolean
gst_curl_http_src_query (GstBaseSrc * bsrc, GstQuery * query)
{
GstCurlHttpSrc *src = GST_CURLHTTPSRC (bsrc);
gboolean ret;
GSTCURL_FUNCTION_ENTRY (src);
switch (GST_QUERY_TYPE (query)) {
case GST_QUERY_URI:
curlhttpsrc: fix various leaks and thread safety issues curlhttpsrc uses a single thread running the gst_curl_http_src_curl_multi_loop() function to handle receiving data and messages from libcurl. Each instance of curlhttpsrc adds an entry into a queue in GstCurlHttpSrcMultiTaskContext and waits for the multi_loop to perform the HTTP request. Valgrind has shown up race conditions and memory leaks: 1. gst_curl_http_src_change_state() does not wait for the multi_loop to complete before going to the NULL state, which means that an instance of GstCurlHttpSrc can be released while gst_curl_http_src_curl_multi_loop() still has a reference to it. 2. if multiple elements try to be removed from the queue at once, only the last one is deleted. 3. source->caps is leaked 4. curl multi_handle is leaked 5. leak of curl_handle if URI not set 6. leak of http_headers when reusing element 7. null pointer dereference in negotiate caps 8. double-free of the default user-agent string 9. leak of multi_task_context.task This commit changes the logic so that each element has a connection status, which is used by the multi_loop to decide when to remove an element from its queue. An instance of curlhttpsrc will not enter the NULL state until its reference has been removed from the queue. When shutting down the curl multi loop, the memory allocated from the call to curl_multi_init() is now released. When gstadaptivedemux uses a URI source element, it will re-use it for multiple requests, moving it between READY and PLAYING between each request. curlhttpsrc was leaking the http_headers structure in this use case. The gst_curl_http_src_negotiate_caps() function extracts the "response-headers" field from the http_headers, but did not check that this field might be NULL. If the user-agent property is set, the global user-agent string was freed. This caused a double-free error if the user-agent is ever set a second time during the execution of the process. There are situations within curlhttpsrc where the code needs both the global multi_task_context mutex and the per-element buffer_mutex. To avoid deadlocks, it is vital that the order in which these are requested is always the same. This commit modifies the locking order to always be in the order: 1. multi_task_context.task_rec_mutex 2. buffer_mutex Fixes #876
2019-02-05 16:34:40 +00:00
g_mutex_lock (&src->uri_mutex);
curl: Add curlhttpsrc element Merged from https://github.com/bbc/gst-curlhttpsrc commit f8aabcfc5c50a44f3362de831377d6e86dcd2d49 https://bugzilla.gnome.org/show_bug.cgi?id=744261
2017-07-25 14:23:57 +00:00
gst_query_set_uri (query, src->uri);
if (src->redirect_uri != NULL) {
gst_query_set_uri_redirection (query, src->redirect_uri);
}
curlhttpsrc: fix various leaks and thread safety issues curlhttpsrc uses a single thread running the gst_curl_http_src_curl_multi_loop() function to handle receiving data and messages from libcurl. Each instance of curlhttpsrc adds an entry into a queue in GstCurlHttpSrcMultiTaskContext and waits for the multi_loop to perform the HTTP request. Valgrind has shown up race conditions and memory leaks: 1. gst_curl_http_src_change_state() does not wait for the multi_loop to complete before going to the NULL state, which means that an instance of GstCurlHttpSrc can be released while gst_curl_http_src_curl_multi_loop() still has a reference to it. 2. if multiple elements try to be removed from the queue at once, only the last one is deleted. 3. source->caps is leaked 4. curl multi_handle is leaked 5. leak of curl_handle if URI not set 6. leak of http_headers when reusing element 7. null pointer dereference in negotiate caps 8. double-free of the default user-agent string 9. leak of multi_task_context.task This commit changes the logic so that each element has a connection status, which is used by the multi_loop to decide when to remove an element from its queue. An instance of curlhttpsrc will not enter the NULL state until its reference has been removed from the queue. When shutting down the curl multi loop, the memory allocated from the call to curl_multi_init() is now released. When gstadaptivedemux uses a URI source element, it will re-use it for multiple requests, moving it between READY and PLAYING between each request. curlhttpsrc was leaking the http_headers structure in this use case. The gst_curl_http_src_negotiate_caps() function extracts the "response-headers" field from the http_headers, but did not check that this field might be NULL. If the user-agent property is set, the global user-agent string was freed. This caused a double-free error if the user-agent is ever set a second time during the execution of the process. There are situations within curlhttpsrc where the code needs both the global multi_task_context mutex and the per-element buffer_mutex. To avoid deadlocks, it is vital that the order in which these are requested is always the same. This commit modifies the locking order to always be in the order: 1. multi_task_context.task_rec_mutex 2. buffer_mutex Fixes #876
2019-02-05 16:34:40 +00:00
g_mutex_unlock (&src->uri_mutex);
curl: Add curlhttpsrc element Merged from https://github.com/bbc/gst-curlhttpsrc commit f8aabcfc5c50a44f3362de831377d6e86dcd2d49 https://bugzilla.gnome.org/show_bug.cgi?id=744261
2017-07-25 14:23:57 +00:00
ret = TRUE;
break;
default:
ret = GST_BASE_SRC_CLASS (parent_class)->query (bsrc, query);
break;
}
GSTCURL_FUNCTION_EXIT (src);
return ret;
}
static gboolean
gst_curl_http_src_get_content_length (GstBaseSrc * bsrc, guint64 * size)
{
GstCurlHttpSrc *src = GST_CURLHTTPSRC (bsrc);
const GValue *response_headers;
gboolean ret = FALSE;
if (src->http_headers == NULL) {
return FALSE;
}
response_headers = gst_structure_get_value (src->http_headers,
RESPONSE_HEADERS_NAME);
curlhttpsrc: fix various leaks and thread safety issues curlhttpsrc uses a single thread running the gst_curl_http_src_curl_multi_loop() function to handle receiving data and messages from libcurl. Each instance of curlhttpsrc adds an entry into a queue in GstCurlHttpSrcMultiTaskContext and waits for the multi_loop to perform the HTTP request. Valgrind has shown up race conditions and memory leaks: 1. gst_curl_http_src_change_state() does not wait for the multi_loop to complete before going to the NULL state, which means that an instance of GstCurlHttpSrc can be released while gst_curl_http_src_curl_multi_loop() still has a reference to it. 2. if multiple elements try to be removed from the queue at once, only the last one is deleted. 3. source->caps is leaked 4. curl multi_handle is leaked 5. leak of curl_handle if URI not set 6. leak of http_headers when reusing element 7. null pointer dereference in negotiate caps 8. double-free of the default user-agent string 9. leak of multi_task_context.task This commit changes the logic so that each element has a connection status, which is used by the multi_loop to decide when to remove an element from its queue. An instance of curlhttpsrc will not enter the NULL state until its reference has been removed from the queue. When shutting down the curl multi loop, the memory allocated from the call to curl_multi_init() is now released. When gstadaptivedemux uses a URI source element, it will re-use it for multiple requests, moving it between READY and PLAYING between each request. curlhttpsrc was leaking the http_headers structure in this use case. The gst_curl_http_src_negotiate_caps() function extracts the "response-headers" field from the http_headers, but did not check that this field might be NULL. If the user-agent property is set, the global user-agent string was freed. This caused a double-free error if the user-agent is ever set a second time during the execution of the process. There are situations within curlhttpsrc where the code needs both the global multi_task_context mutex and the per-element buffer_mutex. To avoid deadlocks, it is vital that the order in which these are requested is always the same. This commit modifies the locking order to always be in the order: 1. multi_task_context.task_rec_mutex 2. buffer_mutex Fixes #876
2019-02-05 16:34:40 +00:00
if (gst_structure_has_field_typed (gst_value_get_structure (response_headers),
"content-length", G_TYPE_STRING)) {
const gchar *content_length =
gst_structure_get_string (gst_value_get_structure (response_headers),
curl: Add curlhttpsrc element Merged from https://github.com/bbc/gst-curlhttpsrc commit f8aabcfc5c50a44f3362de831377d6e86dcd2d49 https://bugzilla.gnome.org/show_bug.cgi?id=744261
2017-07-25 14:23:57 +00:00
"content-length");
curlhttpsrc: fix various leaks and thread safety issues curlhttpsrc uses a single thread running the gst_curl_http_src_curl_multi_loop() function to handle receiving data and messages from libcurl. Each instance of curlhttpsrc adds an entry into a queue in GstCurlHttpSrcMultiTaskContext and waits for the multi_loop to perform the HTTP request. Valgrind has shown up race conditions and memory leaks: 1. gst_curl_http_src_change_state() does not wait for the multi_loop to complete before going to the NULL state, which means that an instance of GstCurlHttpSrc can be released while gst_curl_http_src_curl_multi_loop() still has a reference to it. 2. if multiple elements try to be removed from the queue at once, only the last one is deleted. 3. source->caps is leaked 4. curl multi_handle is leaked 5. leak of curl_handle if URI not set 6. leak of http_headers when reusing element 7. null pointer dereference in negotiate caps 8. double-free of the default user-agent string 9. leak of multi_task_context.task This commit changes the logic so that each element has a connection status, which is used by the multi_loop to decide when to remove an element from its queue. An instance of curlhttpsrc will not enter the NULL state until its reference has been removed from the queue. When shutting down the curl multi loop, the memory allocated from the call to curl_multi_init() is now released. When gstadaptivedemux uses a URI source element, it will re-use it for multiple requests, moving it between READY and PLAYING between each request. curlhttpsrc was leaking the http_headers structure in this use case. The gst_curl_http_src_negotiate_caps() function extracts the "response-headers" field from the http_headers, but did not check that this field might be NULL. If the user-agent property is set, the global user-agent string was freed. This caused a double-free error if the user-agent is ever set a second time during the execution of the process. There are situations within curlhttpsrc where the code needs both the global multi_task_context mutex and the per-element buffer_mutex. To avoid deadlocks, it is vital that the order in which these are requested is always the same. This commit modifies the locking order to always be in the order: 1. multi_task_context.task_rec_mutex 2. buffer_mutex Fixes #876
2019-02-05 16:34:40 +00:00
*size = (guint64) g_ascii_strtoull (content_length, NULL, 10);
ret = TRUE;
} else {
GST_DEBUG_OBJECT (src,
"No content length has yet been set, or there was an error!");
curl: Add curlhttpsrc element Merged from https://github.com/bbc/gst-curlhttpsrc commit f8aabcfc5c50a44f3362de831377d6e86dcd2d49 https://bugzilla.gnome.org/show_bug.cgi?id=744261
2017-07-25 14:23:57 +00:00
}
return ret;
}
curlhttpsrc: add support for range GET To allow curlhttpsrc to support DASH streams that use the on-demand profile, it needs to support HTTP Range GETs. In GStreamer, the RANGE is specified by issuing a GST_FORMAT_BYTES seek to set the start and end of the range. curlhttpsrc needs to implement seek and set the appropriate curl options to make it add the Range header to the request.
2019-05-24 16:33:33 +00:00
static gboolean
gst_curl_http_src_is_seekable (GstBaseSrc * bsrc)
{
GstCurlHttpSrc *src = GST_CURLHTTPSRC (bsrc);
/* NOTE: if seekable is UNKNOWN, assume yes */
return src->seekable != GSTCURL_SEEKABLE_FALSE;
}
static gboolean
gst_curl_http_src_do_seek (GstBaseSrc * bsrc, GstSegment * segment)
{
GstCurlHttpSrc *src = GST_CURLHTTPSRC (bsrc);
gboolean ret = TRUE;
g_mutex_lock (&src->buffer_mutex);
GST_DEBUG_OBJECT (src, "do_seek(%" G_GINT64_FORMAT ", %" G_GINT64_FORMAT
")", segment->start, segment->stop);
if (src->state == GSTCURL_UNLOCK) {
GST_WARNING_OBJECT (src, "Attempt to seek while unlocked");
ret = FALSE;
goto done;
}
if (src->request_position == segment->start &&
src->stop_position == segment->stop) {
GST_DEBUG_OBJECT (src, "Seek to current read/end position");
goto done;
}
if (src->seekable == GSTCURL_SEEKABLE_FALSE) {
GST_WARNING_OBJECT (src, "Not seekable");
ret = FALSE;
goto done;
}
if (segment->rate < 0.0 || segment->format != GST_FORMAT_BYTES) {
GST_WARNING_OBJECT (src, "Invalid seek segment");
ret = FALSE;
goto done;
}
if (src->content_size > 0 && segment->start >= src->content_size) {
GST_WARNING_OBJECT (src,
"Potentially seeking beyond end of file, might EOS immediately");
}
src->request_position = segment->start;
src->stop_position = segment->stop;
done:
g_mutex_unlock (&src->buffer_mutex);
return ret;
}
curl: Add curlhttpsrc element Merged from https://github.com/bbc/gst-curlhttpsrc commit f8aabcfc5c50a44f3362de831377d6e86dcd2d49 https://bugzilla.gnome.org/show_bug.cgi?id=744261
2017-07-25 14:23:57 +00:00
static void
gst_curl_http_src_uri_handler_init (gpointer g_iface, gpointer iface_data)
{
GstURIHandlerInterface *uri_iface = (GstURIHandlerInterface *) g_iface;
uri_iface->get_type = gst_curl_http_src_urihandler_get_type;
uri_iface->get_protocols = gst_curl_http_src_urihandler_get_protocols;
uri_iface->get_uri = gst_curl_http_src_urihandler_get_uri;
uri_iface->set_uri = gst_curl_http_src_urihandler_set_uri;
}
static guint
gst_curl_http_src_urihandler_get_type (GType type)
{
return GST_URI_SRC;
}
static const gchar *const *
gst_curl_http_src_urihandler_get_protocols (GType type)
{
static const gchar *protocols[] = { "http", "https", NULL };
return protocols;
}
static gchar *
gst_curl_http_src_urihandler_get_uri (GstURIHandler * handler)
{
gchar *ret;
GstCurlHttpSrc *source;
curlhttpsrc: Fix return value The function returns a gchar * (and not a boolean)
2017-11-21 14:33:08 +00:00
g_return_val_if_fail (GST_IS_URI_HANDLER (handler), NULL);
curl: Add curlhttpsrc element Merged from https://github.com/bbc/gst-curlhttpsrc commit f8aabcfc5c50a44f3362de831377d6e86dcd2d49 https://bugzilla.gnome.org/show_bug.cgi?id=744261
2017-07-25 14:23:57 +00:00
source = GST_CURLHTTPSRC (handler);
GSTCURL_FUNCTION_ENTRY (source);
g_mutex_lock (&source->uri_mutex);
ret = g_strdup (source->uri);
g_mutex_unlock (&source->uri_mutex);
GSTCURL_FUNCTION_EXIT (source);
return ret;
}
static gboolean
gst_curl_http_src_urihandler_set_uri (GstURIHandler * handler,
const gchar * uri, GError ** error)
{
GstCurlHttpSrc *source = GST_CURLHTTPSRC (handler);
GSTCURL_FUNCTION_ENTRY (source);
g_return_val_if_fail (GST_IS_URI_HANDLER (handler), FALSE);
g_return_val_if_fail (uri != NULL, FALSE);
g_mutex_lock (&source->uri_mutex);
if (source->uri != NULL) {
GST_DEBUG_OBJECT (source,
"URI already present as %s, updating to new URI %s", source->uri, uri);
g_free (source->uri);
}
source->uri = g_strdup (uri);
if (source->uri == NULL) {
curlhttpsrc: fix various leaks and thread safety issues curlhttpsrc uses a single thread running the gst_curl_http_src_curl_multi_loop() function to handle receiving data and messages from libcurl. Each instance of curlhttpsrc adds an entry into a queue in GstCurlHttpSrcMultiTaskContext and waits for the multi_loop to perform the HTTP request. Valgrind has shown up race conditions and memory leaks: 1. gst_curl_http_src_change_state() does not wait for the multi_loop to complete before going to the NULL state, which means that an instance of GstCurlHttpSrc can be released while gst_curl_http_src_curl_multi_loop() still has a reference to it. 2. if multiple elements try to be removed from the queue at once, only the last one is deleted. 3. source->caps is leaked 4. curl multi_handle is leaked 5. leak of curl_handle if URI not set 6. leak of http_headers when reusing element 7. null pointer dereference in negotiate caps 8. double-free of the default user-agent string 9. leak of multi_task_context.task This commit changes the logic so that each element has a connection status, which is used by the multi_loop to decide when to remove an element from its queue. An instance of curlhttpsrc will not enter the NULL state until its reference has been removed from the queue. When shutting down the curl multi loop, the memory allocated from the call to curl_multi_init() is now released. When gstadaptivedemux uses a URI source element, it will re-use it for multiple requests, moving it between READY and PLAYING between each request. curlhttpsrc was leaking the http_headers structure in this use case. The gst_curl_http_src_negotiate_caps() function extracts the "response-headers" field from the http_headers, but did not check that this field might be NULL. If the user-agent property is set, the global user-agent string was freed. This caused a double-free error if the user-agent is ever set a second time during the execution of the process. There are situations within curlhttpsrc where the code needs both the global multi_task_context mutex and the per-element buffer_mutex. To avoid deadlocks, it is vital that the order in which these are requested is always the same. This commit modifies the locking order to always be in the order: 1. multi_task_context.task_rec_mutex 2. buffer_mutex Fixes #876
2019-02-05 16:34:40 +00:00
g_mutex_unlock (&source->uri_mutex);
curl: Add curlhttpsrc element Merged from https://github.com/bbc/gst-curlhttpsrc commit f8aabcfc5c50a44f3362de831377d6e86dcd2d49 https://bugzilla.gnome.org/show_bug.cgi?id=744261
2017-07-25 14:23:57 +00:00
return FALSE;
}
source->retries_remaining = source->total_retries;
g_mutex_unlock (&source->uri_mutex);
GSTCURL_FUNCTION_EXIT (source);
return TRUE;
}
/*
* Cancel any currently running transfer, and then signal all the loops to drop
* any received buffers. The ::create() method should return GST_FLOW_FLUSHING.
*/
static gboolean
gst_curl_http_src_unlock (GstBaseSrc * bsrc)
{
GstCurlHttpSrc *src = GST_CURLHTTPSRC (bsrc);
curlhttpsrc: fix various leaks and thread safety issues curlhttpsrc uses a single thread running the gst_curl_http_src_curl_multi_loop() function to handle receiving data and messages from libcurl. Each instance of curlhttpsrc adds an entry into a queue in GstCurlHttpSrcMultiTaskContext and waits for the multi_loop to perform the HTTP request. Valgrind has shown up race conditions and memory leaks: 1. gst_curl_http_src_change_state() does not wait for the multi_loop to complete before going to the NULL state, which means that an instance of GstCurlHttpSrc can be released while gst_curl_http_src_curl_multi_loop() still has a reference to it. 2. if multiple elements try to be removed from the queue at once, only the last one is deleted. 3. source->caps is leaked 4. curl multi_handle is leaked 5. leak of curl_handle if URI not set 6. leak of http_headers when reusing element 7. null pointer dereference in negotiate caps 8. double-free of the default user-agent string 9. leak of multi_task_context.task This commit changes the logic so that each element has a connection status, which is used by the multi_loop to decide when to remove an element from its queue. An instance of curlhttpsrc will not enter the NULL state until its reference has been removed from the queue. When shutting down the curl multi loop, the memory allocated from the call to curl_multi_init() is now released. When gstadaptivedemux uses a URI source element, it will re-use it for multiple requests, moving it between READY and PLAYING between each request. curlhttpsrc was leaking the http_headers structure in this use case. The gst_curl_http_src_negotiate_caps() function extracts the "response-headers" field from the http_headers, but did not check that this field might be NULL. If the user-agent property is set, the global user-agent string was freed. This caused a double-free error if the user-agent is ever set a second time during the execution of the process. There are situations within curlhttpsrc where the code needs both the global multi_task_context mutex and the per-element buffer_mutex. To avoid deadlocks, it is vital that the order in which these are requested is always the same. This commit modifies the locking order to always be in the order: 1. multi_task_context.task_rec_mutex 2. buffer_mutex Fixes #876
2019-02-05 16:34:40 +00:00
gboolean want_removal = FALSE;
curl: Add curlhttpsrc element Merged from https://github.com/bbc/gst-curlhttpsrc commit f8aabcfc5c50a44f3362de831377d6e86dcd2d49 https://bugzilla.gnome.org/show_bug.cgi?id=744261
2017-07-25 14:23:57 +00:00
g_mutex_lock (&src->buffer_mutex);
if (src->state != GSTCURL_UNLOCK) {
if (src->state == GSTCURL_OK) {
/* A transfer is running, cancel it */
curlhttpsrc: fix various leaks and thread safety issues curlhttpsrc uses a single thread running the gst_curl_http_src_curl_multi_loop() function to handle receiving data and messages from libcurl. Each instance of curlhttpsrc adds an entry into a queue in GstCurlHttpSrcMultiTaskContext and waits for the multi_loop to perform the HTTP request. Valgrind has shown up race conditions and memory leaks: 1. gst_curl_http_src_change_state() does not wait for the multi_loop to complete before going to the NULL state, which means that an instance of GstCurlHttpSrc can be released while gst_curl_http_src_curl_multi_loop() still has a reference to it. 2. if multiple elements try to be removed from the queue at once, only the last one is deleted. 3. source->caps is leaked 4. curl multi_handle is leaked 5. leak of curl_handle if URI not set 6. leak of http_headers when reusing element 7. null pointer dereference in negotiate caps 8. double-free of the default user-agent string 9. leak of multi_task_context.task This commit changes the logic so that each element has a connection status, which is used by the multi_loop to decide when to remove an element from its queue. An instance of curlhttpsrc will not enter the NULL state until its reference has been removed from the queue. When shutting down the curl multi loop, the memory allocated from the call to curl_multi_init() is now released. When gstadaptivedemux uses a URI source element, it will re-use it for multiple requests, moving it between READY and PLAYING between each request. curlhttpsrc was leaking the http_headers structure in this use case. The gst_curl_http_src_negotiate_caps() function extracts the "response-headers" field from the http_headers, but did not check that this field might be NULL. If the user-agent property is set, the global user-agent string was freed. This caused a double-free error if the user-agent is ever set a second time during the execution of the process. There are situations within curlhttpsrc where the code needs both the global multi_task_context mutex and the per-element buffer_mutex. To avoid deadlocks, it is vital that the order in which these are requested is always the same. This commit modifies the locking order to always be in the order: 1. multi_task_context.task_rec_mutex 2. buffer_mutex Fixes #876
2019-02-05 16:34:40 +00:00
if (src->connection_status == GSTCURL_CONNECTED) {
src->connection_status = GSTCURL_WANT_REMOVAL;
}
want_removal = TRUE;
curl: Add curlhttpsrc element Merged from https://github.com/bbc/gst-curlhttpsrc commit f8aabcfc5c50a44f3362de831377d6e86dcd2d49 https://bugzilla.gnome.org/show_bug.cgi?id=744261
2017-07-25 14:23:57 +00:00
}
src->pending_state = src->state;
src->state = GSTCURL_UNLOCK;
}
curlhttpsrc: fix various leaks and thread safety issues curlhttpsrc uses a single thread running the gst_curl_http_src_curl_multi_loop() function to handle receiving data and messages from libcurl. Each instance of curlhttpsrc adds an entry into a queue in GstCurlHttpSrcMultiTaskContext and waits for the multi_loop to perform the HTTP request. Valgrind has shown up race conditions and memory leaks: 1. gst_curl_http_src_change_state() does not wait for the multi_loop to complete before going to the NULL state, which means that an instance of GstCurlHttpSrc can be released while gst_curl_http_src_curl_multi_loop() still has a reference to it. 2. if multiple elements try to be removed from the queue at once, only the last one is deleted. 3. source->caps is leaked 4. curl multi_handle is leaked 5. leak of curl_handle if URI not set 6. leak of http_headers when reusing element 7. null pointer dereference in negotiate caps 8. double-free of the default user-agent string 9. leak of multi_task_context.task This commit changes the logic so that each element has a connection status, which is used by the multi_loop to decide when to remove an element from its queue. An instance of curlhttpsrc will not enter the NULL state until its reference has been removed from the queue. When shutting down the curl multi loop, the memory allocated from the call to curl_multi_init() is now released. When gstadaptivedemux uses a URI source element, it will re-use it for multiple requests, moving it between READY and PLAYING between each request. curlhttpsrc was leaking the http_headers structure in this use case. The gst_curl_http_src_negotiate_caps() function extracts the "response-headers" field from the http_headers, but did not check that this field might be NULL. If the user-agent property is set, the global user-agent string was freed. This caused a double-free error if the user-agent is ever set a second time during the execution of the process. There are situations within curlhttpsrc where the code needs both the global multi_task_context mutex and the per-element buffer_mutex. To avoid deadlocks, it is vital that the order in which these are requested is always the same. This commit modifies the locking order to always be in the order: 1. multi_task_context.task_rec_mutex 2. buffer_mutex Fixes #876
2019-02-05 16:34:40 +00:00
g_cond_signal (&src->buffer_cond);
curl: Add curlhttpsrc element Merged from https://github.com/bbc/gst-curlhttpsrc commit f8aabcfc5c50a44f3362de831377d6e86dcd2d49 https://bugzilla.gnome.org/show_bug.cgi?id=744261
2017-07-25 14:23:57 +00:00
g_mutex_unlock (&src->buffer_mutex);
curlhttpsrc: fix various leaks and thread safety issues curlhttpsrc uses a single thread running the gst_curl_http_src_curl_multi_loop() function to handle receiving data and messages from libcurl. Each instance of curlhttpsrc adds an entry into a queue in GstCurlHttpSrcMultiTaskContext and waits for the multi_loop to perform the HTTP request. Valgrind has shown up race conditions and memory leaks: 1. gst_curl_http_src_change_state() does not wait for the multi_loop to complete before going to the NULL state, which means that an instance of GstCurlHttpSrc can be released while gst_curl_http_src_curl_multi_loop() still has a reference to it. 2. if multiple elements try to be removed from the queue at once, only the last one is deleted. 3. source->caps is leaked 4. curl multi_handle is leaked 5. leak of curl_handle if URI not set 6. leak of http_headers when reusing element 7. null pointer dereference in negotiate caps 8. double-free of the default user-agent string 9. leak of multi_task_context.task This commit changes the logic so that each element has a connection status, which is used by the multi_loop to decide when to remove an element from its queue. An instance of curlhttpsrc will not enter the NULL state until its reference has been removed from the queue. When shutting down the curl multi loop, the memory allocated from the call to curl_multi_init() is now released. When gstadaptivedemux uses a URI source element, it will re-use it for multiple requests, moving it between READY and PLAYING between each request. curlhttpsrc was leaking the http_headers structure in this use case. The gst_curl_http_src_negotiate_caps() function extracts the "response-headers" field from the http_headers, but did not check that this field might be NULL. If the user-agent property is set, the global user-agent string was freed. This caused a double-free error if the user-agent is ever set a second time during the execution of the process. There are situations within curlhttpsrc where the code needs both the global multi_task_context mutex and the per-element buffer_mutex. To avoid deadlocks, it is vital that the order in which these are requested is always the same. This commit modifies the locking order to always be in the order: 1. multi_task_context.task_rec_mutex 2. buffer_mutex Fixes #876
2019-02-05 16:34:40 +00:00
if (want_removal) {
GstCurlHttpSrcClass *klass = G_TYPE_INSTANCE_GET_CLASS (src,
GST_TYPE_CURL_HTTP_SRC,
GstCurlHttpSrcClass);
g_mutex_lock (&klass->multi_task_context.mutex);
g_cond_signal (&klass->multi_task_context.signal);
g_mutex_unlock (&klass->multi_task_context.mutex);
}
curl: Add curlhttpsrc element Merged from https://github.com/bbc/gst-curlhttpsrc commit f8aabcfc5c50a44f3362de831377d6e86dcd2d49 https://bugzilla.gnome.org/show_bug.cgi?id=744261
2017-07-25 14:23:57 +00:00
return TRUE;
}
/*
* Finish the unlock request above and return curlhttpsrc to the normal state.
* This will probably be GSTCURL_DONE, and the next return from ::create() will
* be GST_FLOW_EOS as we don't want to deliver parts of a HTTP body.
*/
static gboolean
gst_curl_http_src_unlock_stop (GstBaseSrc * bsrc)
{
GstCurlHttpSrc *src = GST_CURLHTTPSRC (bsrc);
g_mutex_lock (&src->buffer_mutex);
src->state = src->pending_state;
src->pending_state = GSTCURL_NONE;
curlhttpsrc: fix various leaks and thread safety issues curlhttpsrc uses a single thread running the gst_curl_http_src_curl_multi_loop() function to handle receiving data and messages from libcurl. Each instance of curlhttpsrc adds an entry into a queue in GstCurlHttpSrcMultiTaskContext and waits for the multi_loop to perform the HTTP request. Valgrind has shown up race conditions and memory leaks: 1. gst_curl_http_src_change_state() does not wait for the multi_loop to complete before going to the NULL state, which means that an instance of GstCurlHttpSrc can be released while gst_curl_http_src_curl_multi_loop() still has a reference to it. 2. if multiple elements try to be removed from the queue at once, only the last one is deleted. 3. source->caps is leaked 4. curl multi_handle is leaked 5. leak of curl_handle if URI not set 6. leak of http_headers when reusing element 7. null pointer dereference in negotiate caps 8. double-free of the default user-agent string 9. leak of multi_task_context.task This commit changes the logic so that each element has a connection status, which is used by the multi_loop to decide when to remove an element from its queue. An instance of curlhttpsrc will not enter the NULL state until its reference has been removed from the queue. When shutting down the curl multi loop, the memory allocated from the call to curl_multi_init() is now released. When gstadaptivedemux uses a URI source element, it will re-use it for multiple requests, moving it between READY and PLAYING between each request. curlhttpsrc was leaking the http_headers structure in this use case. The gst_curl_http_src_negotiate_caps() function extracts the "response-headers" field from the http_headers, but did not check that this field might be NULL. If the user-agent property is set, the global user-agent string was freed. This caused a double-free error if the user-agent is ever set a second time during the execution of the process. There are situations within curlhttpsrc where the code needs both the global multi_task_context mutex and the per-element buffer_mutex. To avoid deadlocks, it is vital that the order in which these are requested is always the same. This commit modifies the locking order to always be in the order: 1. multi_task_context.task_rec_mutex 2. buffer_mutex Fixes #876
2019-02-05 16:34:40 +00:00
g_cond_signal (&src->buffer_cond);
curl: Add curlhttpsrc element Merged from https://github.com/bbc/gst-curlhttpsrc commit f8aabcfc5c50a44f3362de831377d6e86dcd2d49 https://bugzilla.gnome.org/show_bug.cgi?id=744261
2017-07-25 14:23:57 +00:00
g_mutex_unlock (&src->buffer_mutex);
return TRUE;
}
/*****************************************************************************
* Curl loop task functions begin
*****************************************************************************/
static void
gst_curl_http_src_curl_multi_loop (gpointer thread_data)
{
GstCurlHttpSrcMultiTaskContext *context;
curlhhtpsrc: avoid invalid memory references gst_curl_http_src_remove_queue_item() can free qelement and then we get an invalid memory reference when we do qelement->next a couple of lines below. Take the next pointer earlier so that we can safely free.
2018-08-16 09:42:25 +00:00
GstCurlHttpSrcQueueElement *qelement, *qnext;
curlhttpsrc: fix various leaks and thread safety issues curlhttpsrc uses a single thread running the gst_curl_http_src_curl_multi_loop() function to handle receiving data and messages from libcurl. Each instance of curlhttpsrc adds an entry into a queue in GstCurlHttpSrcMultiTaskContext and waits for the multi_loop to perform the HTTP request. Valgrind has shown up race conditions and memory leaks: 1. gst_curl_http_src_change_state() does not wait for the multi_loop to complete before going to the NULL state, which means that an instance of GstCurlHttpSrc can be released while gst_curl_http_src_curl_multi_loop() still has a reference to it. 2. if multiple elements try to be removed from the queue at once, only the last one is deleted. 3. source->caps is leaked 4. curl multi_handle is leaked 5. leak of curl_handle if URI not set 6. leak of http_headers when reusing element 7. null pointer dereference in negotiate caps 8. double-free of the default user-agent string 9. leak of multi_task_context.task This commit changes the logic so that each element has a connection status, which is used by the multi_loop to decide when to remove an element from its queue. An instance of curlhttpsrc will not enter the NULL state until its reference has been removed from the queue. When shutting down the curl multi loop, the memory allocated from the call to curl_multi_init() is now released. When gstadaptivedemux uses a URI source element, it will re-use it for multiple requests, moving it between READY and PLAYING between each request. curlhttpsrc was leaking the http_headers structure in this use case. The gst_curl_http_src_negotiate_caps() function extracts the "response-headers" field from the http_headers, but did not check that this field might be NULL. If the user-agent property is set, the global user-agent string was freed. This caused a double-free error if the user-agent is ever set a second time during the execution of the process. There are situations within curlhttpsrc where the code needs both the global multi_task_context mutex and the per-element buffer_mutex. To avoid deadlocks, it is vital that the order in which these are requested is always the same. This commit modifies the locking order to always be in the order: 1. multi_task_context.task_rec_mutex 2. buffer_mutex Fixes #876
2019-02-05 16:34:40 +00:00
gint i, still_running = 0;
curl: Add curlhttpsrc element Merged from https://github.com/bbc/gst-curlhttpsrc commit f8aabcfc5c50a44f3362de831377d6e86dcd2d49 https://bugzilla.gnome.org/show_bug.cgi?id=744261
2017-07-25 14:23:57 +00:00
CURLMsg *curl_message;
curlhttpsrc: fix various leaks and thread safety issues curlhttpsrc uses a single thread running the gst_curl_http_src_curl_multi_loop() function to handle receiving data and messages from libcurl. Each instance of curlhttpsrc adds an entry into a queue in GstCurlHttpSrcMultiTaskContext and waits for the multi_loop to perform the HTTP request. Valgrind has shown up race conditions and memory leaks: 1. gst_curl_http_src_change_state() does not wait for the multi_loop to complete before going to the NULL state, which means that an instance of GstCurlHttpSrc can be released while gst_curl_http_src_curl_multi_loop() still has a reference to it. 2. if multiple elements try to be removed from the queue at once, only the last one is deleted. 3. source->caps is leaked 4. curl multi_handle is leaked 5. leak of curl_handle if URI not set 6. leak of http_headers when reusing element 7. null pointer dereference in negotiate caps 8. double-free of the default user-agent string 9. leak of multi_task_context.task This commit changes the logic so that each element has a connection status, which is used by the multi_loop to decide when to remove an element from its queue. An instance of curlhttpsrc will not enter the NULL state until its reference has been removed from the queue. When shutting down the curl multi loop, the memory allocated from the call to curl_multi_init() is now released. When gstadaptivedemux uses a URI source element, it will re-use it for multiple requests, moving it between READY and PLAYING between each request. curlhttpsrc was leaking the http_headers structure in this use case. The gst_curl_http_src_negotiate_caps() function extracts the "response-headers" field from the http_headers, but did not check that this field might be NULL. If the user-agent property is set, the global user-agent string was freed. This caused a double-free error if the user-agent is ever set a second time during the execution of the process. There are situations within curlhttpsrc where the code needs both the global multi_task_context mutex and the per-element buffer_mutex. To avoid deadlocks, it is vital that the order in which these are requested is always the same. This commit modifies the locking order to always be in the order: 1. multi_task_context.task_rec_mutex 2. buffer_mutex Fixes #876
2019-02-05 16:34:40 +00:00
GstCurlHttpSrc *elt;
guint active = 0;
curl: Add curlhttpsrc element Merged from https://github.com/bbc/gst-curlhttpsrc commit f8aabcfc5c50a44f3362de831377d6e86dcd2d49 https://bugzilla.gnome.org/show_bug.cgi?id=744261
2017-07-25 14:23:57 +00:00
context = (GstCurlHttpSrcMultiTaskContext *) thread_data;
g_mutex_lock (&context->mutex);
/* Someone is holding a reference to us, but isn't using us so to avoid
* unnecessary clock cycle wasting, sit in a conditional wait until woken.
*/
curlhttpsrc: fix various leaks and thread safety issues curlhttpsrc uses a single thread running the gst_curl_http_src_curl_multi_loop() function to handle receiving data and messages from libcurl. Each instance of curlhttpsrc adds an entry into a queue in GstCurlHttpSrcMultiTaskContext and waits for the multi_loop to perform the HTTP request. Valgrind has shown up race conditions and memory leaks: 1. gst_curl_http_src_change_state() does not wait for the multi_loop to complete before going to the NULL state, which means that an instance of GstCurlHttpSrc can be released while gst_curl_http_src_curl_multi_loop() still has a reference to it. 2. if multiple elements try to be removed from the queue at once, only the last one is deleted. 3. source->caps is leaked 4. curl multi_handle is leaked 5. leak of curl_handle if URI not set 6. leak of http_headers when reusing element 7. null pointer dereference in negotiate caps 8. double-free of the default user-agent string 9. leak of multi_task_context.task This commit changes the logic so that each element has a connection status, which is used by the multi_loop to decide when to remove an element from its queue. An instance of curlhttpsrc will not enter the NULL state until its reference has been removed from the queue. When shutting down the curl multi loop, the memory allocated from the call to curl_multi_init() is now released. When gstadaptivedemux uses a URI source element, it will re-use it for multiple requests, moving it between READY and PLAYING between each request. curlhttpsrc was leaking the http_headers structure in this use case. The gst_curl_http_src_negotiate_caps() function extracts the "response-headers" field from the http_headers, but did not check that this field might be NULL. If the user-agent property is set, the global user-agent string was freed. This caused a double-free error if the user-agent is ever set a second time during the execution of the process. There are situations within curlhttpsrc where the code needs both the global multi_task_context mutex and the per-element buffer_mutex. To avoid deadlocks, it is vital that the order in which these are requested is always the same. This commit modifies the locking order to always be in the order: 1. multi_task_context.task_rec_mutex 2. buffer_mutex Fixes #876
2019-02-05 16:34:40 +00:00
while (context->queue == NULL
&& context->state == GSTCURL_MULTI_LOOP_STATE_RUNNING) {
GSTCURL_DEBUG_PRINT ("Waiting for an element to be added...");
curl: Add curlhttpsrc element Merged from https://github.com/bbc/gst-curlhttpsrc commit f8aabcfc5c50a44f3362de831377d6e86dcd2d49 https://bugzilla.gnome.org/show_bug.cgi?id=744261
2017-07-25 14:23:57 +00:00
g_cond_wait (&context->signal, &context->mutex);
GSTCURL_DEBUG_PRINT ("Received wake up call!");
}
curlhttpsrc: fix various leaks and thread safety issues curlhttpsrc uses a single thread running the gst_curl_http_src_curl_multi_loop() function to handle receiving data and messages from libcurl. Each instance of curlhttpsrc adds an entry into a queue in GstCurlHttpSrcMultiTaskContext and waits for the multi_loop to perform the HTTP request. Valgrind has shown up race conditions and memory leaks: 1. gst_curl_http_src_change_state() does not wait for the multi_loop to complete before going to the NULL state, which means that an instance of GstCurlHttpSrc can be released while gst_curl_http_src_curl_multi_loop() still has a reference to it. 2. if multiple elements try to be removed from the queue at once, only the last one is deleted. 3. source->caps is leaked 4. curl multi_handle is leaked 5. leak of curl_handle if URI not set 6. leak of http_headers when reusing element 7. null pointer dereference in negotiate caps 8. double-free of the default user-agent string 9. leak of multi_task_context.task This commit changes the logic so that each element has a connection status, which is used by the multi_loop to decide when to remove an element from its queue. An instance of curlhttpsrc will not enter the NULL state until its reference has been removed from the queue. When shutting down the curl multi loop, the memory allocated from the call to curl_multi_init() is now released. When gstadaptivedemux uses a URI source element, it will re-use it for multiple requests, moving it between READY and PLAYING between each request. curlhttpsrc was leaking the http_headers structure in this use case. The gst_curl_http_src_negotiate_caps() function extracts the "response-headers" field from the http_headers, but did not check that this field might be NULL. If the user-agent property is set, the global user-agent string was freed. This caused a double-free error if the user-agent is ever set a second time during the execution of the process. There are situations within curlhttpsrc where the code needs both the global multi_task_context mutex and the per-element buffer_mutex. To avoid deadlocks, it is vital that the order in which these are requested is always the same. This commit modifies the locking order to always be in the order: 1. multi_task_context.task_rec_mutex 2. buffer_mutex Fixes #876
2019-02-05 16:34:40 +00:00
if (context->state == GSTCURL_MULTI_LOOP_STATE_STOP) {
GSTCURL_INFO_PRINT ("Got instruction to shut down");
goto out;
}
curl: Add curlhttpsrc element Merged from https://github.com/bbc/gst-curlhttpsrc commit f8aabcfc5c50a44f3362de831377d6e86dcd2d49 https://bugzilla.gnome.org/show_bug.cgi?id=744261
2017-07-25 14:23:57 +00:00
curlhttpsrc: fix various leaks and thread safety issues curlhttpsrc uses a single thread running the gst_curl_http_src_curl_multi_loop() function to handle receiving data and messages from libcurl. Each instance of curlhttpsrc adds an entry into a queue in GstCurlHttpSrcMultiTaskContext and waits for the multi_loop to perform the HTTP request. Valgrind has shown up race conditions and memory leaks: 1. gst_curl_http_src_change_state() does not wait for the multi_loop to complete before going to the NULL state, which means that an instance of GstCurlHttpSrc can be released while gst_curl_http_src_curl_multi_loop() still has a reference to it. 2. if multiple elements try to be removed from the queue at once, only the last one is deleted. 3. source->caps is leaked 4. curl multi_handle is leaked 5. leak of curl_handle if URI not set 6. leak of http_headers when reusing element 7. null pointer dereference in negotiate caps 8. double-free of the default user-agent string 9. leak of multi_task_context.task This commit changes the logic so that each element has a connection status, which is used by the multi_loop to decide when to remove an element from its queue. An instance of curlhttpsrc will not enter the NULL state until its reference has been removed from the queue. When shutting down the curl multi loop, the memory allocated from the call to curl_multi_init() is now released. When gstadaptivedemux uses a URI source element, it will re-use it for multiple requests, moving it between READY and PLAYING between each request. curlhttpsrc was leaking the http_headers structure in this use case. The gst_curl_http_src_negotiate_caps() function extracts the "response-headers" field from the http_headers, but did not check that this field might be NULL. If the user-agent property is set, the global user-agent string was freed. This caused a double-free error if the user-agent is ever set a second time during the execution of the process. There are situations within curlhttpsrc where the code needs both the global multi_task_context mutex and the per-element buffer_mutex. To avoid deadlocks, it is vital that the order in which these are requested is always the same. This commit modifies the locking order to always be in the order: 1. multi_task_context.task_rec_mutex 2. buffer_mutex Fixes #876
2019-02-05 16:34:40 +00:00
/* check for elements that need to be started or removed */
qelement = context->queue;
while (qelement != NULL) {
qnext = qelement->next;
elt = qelement->p;
/* NOTE: when both the buffer_mutex and multi_task_context.mutex are
needed, multi_task_context.mutex must be acquired first */
g_mutex_lock (&elt->buffer_mutex);
if (elt->connection_status == GSTCURL_WANT_REMOVAL) {
curl_multi_remove_handle (context->multi_handle, elt->curl_handle);
if (elt->state == GSTCURL_UNLOCK) {
elt->pending_state = GSTCURL_REMOVED;
} else {
elt->state = GSTCURL_REMOVED;
}
elt->connection_status = GSTCURL_NOT_CONNECTED;
gst_curl_http_src_remove_queue_item (&context->queue, qelement->p);
g_cond_signal (&elt->buffer_cond);
} else if (elt->connection_status == GSTCURL_CONNECTED) {
active++;
if (g_atomic_int_compare_and_exchange (&qelement->running, 0, 1)) {
curl: Add curlhttpsrc element Merged from https://github.com/bbc/gst-curlhttpsrc commit f8aabcfc5c50a44f3362de831377d6e86dcd2d49 https://bugzilla.gnome.org/show_bug.cgi?id=744261
2017-07-25 14:23:57 +00:00
GSTCURL_DEBUG_PRINT ("Adding easy handle for URI %s", qelement->p->uri);
curl_multi_add_handle (context->multi_handle, qelement->p->curl_handle);
}
}
curlhttpsrc: fix various leaks and thread safety issues curlhttpsrc uses a single thread running the gst_curl_http_src_curl_multi_loop() function to handle receiving data and messages from libcurl. Each instance of curlhttpsrc adds an entry into a queue in GstCurlHttpSrcMultiTaskContext and waits for the multi_loop to perform the HTTP request. Valgrind has shown up race conditions and memory leaks: 1. gst_curl_http_src_change_state() does not wait for the multi_loop to complete before going to the NULL state, which means that an instance of GstCurlHttpSrc can be released while gst_curl_http_src_curl_multi_loop() still has a reference to it. 2. if multiple elements try to be removed from the queue at once, only the last one is deleted. 3. source->caps is leaked 4. curl multi_handle is leaked 5. leak of curl_handle if URI not set 6. leak of http_headers when reusing element 7. null pointer dereference in negotiate caps 8. double-free of the default user-agent string 9. leak of multi_task_context.task This commit changes the logic so that each element has a connection status, which is used by the multi_loop to decide when to remove an element from its queue. An instance of curlhttpsrc will not enter the NULL state until its reference has been removed from the queue. When shutting down the curl multi loop, the memory allocated from the call to curl_multi_init() is now released. When gstadaptivedemux uses a URI source element, it will re-use it for multiple requests, moving it between READY and PLAYING between each request. curlhttpsrc was leaking the http_headers structure in this use case. The gst_curl_http_src_negotiate_caps() function extracts the "response-headers" field from the http_headers, but did not check that this field might be NULL. If the user-agent property is set, the global user-agent string was freed. This caused a double-free error if the user-agent is ever set a second time during the execution of the process. There are situations within curlhttpsrc where the code needs both the global multi_task_context mutex and the per-element buffer_mutex. To avoid deadlocks, it is vital that the order in which these are requested is always the same. This commit modifies the locking order to always be in the order: 1. multi_task_context.task_rec_mutex 2. buffer_mutex Fixes #876
2019-02-05 16:34:40 +00:00
g_mutex_unlock (&elt->buffer_mutex);
qelement = qnext;
}
curl: Add curlhttpsrc element Merged from https://github.com/bbc/gst-curlhttpsrc commit f8aabcfc5c50a44f3362de831377d6e86dcd2d49 https://bugzilla.gnome.org/show_bug.cgi?id=744261
2017-07-25 14:23:57 +00:00
curlhttpsrc: fix various leaks and thread safety issues curlhttpsrc uses a single thread running the gst_curl_http_src_curl_multi_loop() function to handle receiving data and messages from libcurl. Each instance of curlhttpsrc adds an entry into a queue in GstCurlHttpSrcMultiTaskContext and waits for the multi_loop to perform the HTTP request. Valgrind has shown up race conditions and memory leaks: 1. gst_curl_http_src_change_state() does not wait for the multi_loop to complete before going to the NULL state, which means that an instance of GstCurlHttpSrc can be released while gst_curl_http_src_curl_multi_loop() still has a reference to it. 2. if multiple elements try to be removed from the queue at once, only the last one is deleted. 3. source->caps is leaked 4. curl multi_handle is leaked 5. leak of curl_handle if URI not set 6. leak of http_headers when reusing element 7. null pointer dereference in negotiate caps 8. double-free of the default user-agent string 9. leak of multi_task_context.task This commit changes the logic so that each element has a connection status, which is used by the multi_loop to decide when to remove an element from its queue. An instance of curlhttpsrc will not enter the NULL state until its reference has been removed from the queue. When shutting down the curl multi loop, the memory allocated from the call to curl_multi_init() is now released. When gstadaptivedemux uses a URI source element, it will re-use it for multiple requests, moving it between READY and PLAYING between each request. curlhttpsrc was leaking the http_headers structure in this use case. The gst_curl_http_src_negotiate_caps() function extracts the "response-headers" field from the http_headers, but did not check that this field might be NULL. If the user-agent property is set, the global user-agent string was freed. This caused a double-free error if the user-agent is ever set a second time during the execution of the process. There are situations within curlhttpsrc where the code needs both the global multi_task_context mutex and the per-element buffer_mutex. To avoid deadlocks, it is vital that the order in which these are requested is always the same. This commit modifies the locking order to always be in the order: 1. multi_task_context.task_rec_mutex 2. buffer_mutex Fixes #876
2019-02-05 16:34:40 +00:00
if (active == 0) {
GSTCURL_DEBUG_PRINT ("No active elements");
goto out;
}
/* perform a select() on all of the active sockets and process any
messages from curl */
{
curl: Add curlhttpsrc element Merged from https://github.com/bbc/gst-curlhttpsrc commit f8aabcfc5c50a44f3362de831377d6e86dcd2d49 https://bugzilla.gnome.org/show_bug.cgi?id=744261
2017-07-25 14:23:57 +00:00
struct timeval timeout;
gint rc;
fd_set fdread, fdwrite, fdexcep;
int maxfd = -1;
long curl_timeo = -1;
curlhttpsrc: fix various leaks and thread safety issues curlhttpsrc uses a single thread running the gst_curl_http_src_curl_multi_loop() function to handle receiving data and messages from libcurl. Each instance of curlhttpsrc adds an entry into a queue in GstCurlHttpSrcMultiTaskContext and waits for the multi_loop to perform the HTTP request. Valgrind has shown up race conditions and memory leaks: 1. gst_curl_http_src_change_state() does not wait for the multi_loop to complete before going to the NULL state, which means that an instance of GstCurlHttpSrc can be released while gst_curl_http_src_curl_multi_loop() still has a reference to it. 2. if multiple elements try to be removed from the queue at once, only the last one is deleted. 3. source->caps is leaked 4. curl multi_handle is leaked 5. leak of curl_handle if URI not set 6. leak of http_headers when reusing element 7. null pointer dereference in negotiate caps 8. double-free of the default user-agent string 9. leak of multi_task_context.task This commit changes the logic so that each element has a connection status, which is used by the multi_loop to decide when to remove an element from its queue. An instance of curlhttpsrc will not enter the NULL state until its reference has been removed from the queue. When shutting down the curl multi loop, the memory allocated from the call to curl_multi_init() is now released. When gstadaptivedemux uses a URI source element, it will re-use it for multiple requests, moving it between READY and PLAYING between each request. curlhttpsrc was leaking the http_headers structure in this use case. The gst_curl_http_src_negotiate_caps() function extracts the "response-headers" field from the http_headers, but did not check that this field might be NULL. If the user-agent property is set, the global user-agent string was freed. This caused a double-free error if the user-agent is ever set a second time during the execution of the process. There are situations within curlhttpsrc where the code needs both the global multi_task_context mutex and the per-element buffer_mutex. To avoid deadlocks, it is vital that the order in which these are requested is always the same. This commit modifies the locking order to always be in the order: 1. multi_task_context.task_rec_mutex 2. buffer_mutex Fixes #876
2019-02-05 16:34:40 +00:00
gboolean cond = FALSE;
curl: Add curlhttpsrc element Merged from https://github.com/bbc/gst-curlhttpsrc commit f8aabcfc5c50a44f3362de831377d6e86dcd2d49 https://bugzilla.gnome.org/show_bug.cgi?id=744261
2017-07-25 14:23:57 +00:00
/* Because curl can possibly take some time here, be nice and let go of the
* mutex so other threads can perform state/queue operations as we don't
* care about those until the end of this. */
g_mutex_unlock (&context->mutex);
FD_ZERO (&fdread);
FD_ZERO (&fdwrite);
FD_ZERO (&fdexcep);
timeout.tv_sec = 1;
timeout.tv_usec = 0;
curl_multi_timeout (context->multi_handle, &curl_timeo);
if (curl_timeo >= 0) {
timeout.tv_sec = curl_timeo / 1000;
if (timeout.tv_sec > 1) {
timeout.tv_sec = 1;
} else {
timeout.tv_usec = (curl_timeo % 1000) * 1000;
}
}
/* get file descriptors from the transfers */
curl_multi_fdset (context->multi_handle, &fdread, &fdwrite, &fdexcep,
&maxfd);
rc = select (maxfd + 1, &fdread, &fdwrite, &fdexcep, &timeout);
switch (rc) {
case -1:
/* select error */
break;
case 0:
default:
/* timeout or readable/writable sockets */
curl_multi_perform (context->multi_handle, &still_running);
break;
}
curlhttpsrc: fix various leaks and thread safety issues curlhttpsrc uses a single thread running the gst_curl_http_src_curl_multi_loop() function to handle receiving data and messages from libcurl. Each instance of curlhttpsrc adds an entry into a queue in GstCurlHttpSrcMultiTaskContext and waits for the multi_loop to perform the HTTP request. Valgrind has shown up race conditions and memory leaks: 1. gst_curl_http_src_change_state() does not wait for the multi_loop to complete before going to the NULL state, which means that an instance of GstCurlHttpSrc can be released while gst_curl_http_src_curl_multi_loop() still has a reference to it. 2. if multiple elements try to be removed from the queue at once, only the last one is deleted. 3. source->caps is leaked 4. curl multi_handle is leaked 5. leak of curl_handle if URI not set 6. leak of http_headers when reusing element 7. null pointer dereference in negotiate caps 8. double-free of the default user-agent string 9. leak of multi_task_context.task This commit changes the logic so that each element has a connection status, which is used by the multi_loop to decide when to remove an element from its queue. An instance of curlhttpsrc will not enter the NULL state until its reference has been removed from the queue. When shutting down the curl multi loop, the memory allocated from the call to curl_multi_init() is now released. When gstadaptivedemux uses a URI source element, it will re-use it for multiple requests, moving it between READY and PLAYING between each request. curlhttpsrc was leaking the http_headers structure in this use case. The gst_curl_http_src_negotiate_caps() function extracts the "response-headers" field from the http_headers, but did not check that this field might be NULL. If the user-agent property is set, the global user-agent string was freed. This caused a double-free error if the user-agent is ever set a second time during the execution of the process. There are situations within curlhttpsrc where the code needs both the global multi_task_context mutex and the per-element buffer_mutex. To avoid deadlocks, it is vital that the order in which these are requested is always the same. This commit modifies the locking order to always be in the order: 1. multi_task_context.task_rec_mutex 2. buffer_mutex Fixes #876
2019-02-05 16:34:40 +00:00
g_mutex_lock (&context->mutex);
curl: Add curlhttpsrc element Merged from https://github.com/bbc/gst-curlhttpsrc commit f8aabcfc5c50a44f3362de831377d6e86dcd2d49 https://bugzilla.gnome.org/show_bug.cgi?id=744261
2017-07-25 14:23:57 +00:00
/*
* Check the CURL message buffer to find out if any transfers have
* completed. If they have, call the signal_finished function which
* will signal the g_cond_wait call in that calling instance.
*/
i = 0;
while (cond != TRUE) {
curl_message = curl_multi_info_read (context->multi_handle, &i);
if (curl_message == NULL) {
cond = TRUE;
} else if (curl_message->msg == CURLMSG_DONE) {
/* A hack, but I have seen curl_message->easy_handle being
* NULL randomly, so check for that. */
curlhttpsrc: fix various leaks and thread safety issues curlhttpsrc uses a single thread running the gst_curl_http_src_curl_multi_loop() function to handle receiving data and messages from libcurl. Each instance of curlhttpsrc adds an entry into a queue in GstCurlHttpSrcMultiTaskContext and waits for the multi_loop to perform the HTTP request. Valgrind has shown up race conditions and memory leaks: 1. gst_curl_http_src_change_state() does not wait for the multi_loop to complete before going to the NULL state, which means that an instance of GstCurlHttpSrc can be released while gst_curl_http_src_curl_multi_loop() still has a reference to it. 2. if multiple elements try to be removed from the queue at once, only the last one is deleted. 3. source->caps is leaked 4. curl multi_handle is leaked 5. leak of curl_handle if URI not set 6. leak of http_headers when reusing element 7. null pointer dereference in negotiate caps 8. double-free of the default user-agent string 9. leak of multi_task_context.task This commit changes the logic so that each element has a connection status, which is used by the multi_loop to decide when to remove an element from its queue. An instance of curlhttpsrc will not enter the NULL state until its reference has been removed from the queue. When shutting down the curl multi loop, the memory allocated from the call to curl_multi_init() is now released. When gstadaptivedemux uses a URI source element, it will re-use it for multiple requests, moving it between READY and PLAYING between each request. curlhttpsrc was leaking the http_headers structure in this use case. The gst_curl_http_src_negotiate_caps() function extracts the "response-headers" field from the http_headers, but did not check that this field might be NULL. If the user-agent property is set, the global user-agent string was freed. This caused a double-free error if the user-agent is ever set a second time during the execution of the process. There are situations within curlhttpsrc where the code needs both the global multi_task_context mutex and the per-element buffer_mutex. To avoid deadlocks, it is vital that the order in which these are requested is always the same. This commit modifies the locking order to always be in the order: 1. multi_task_context.task_rec_mutex 2. buffer_mutex Fixes #876
2019-02-05 16:34:40 +00:00
if (curl_message->easy_handle != NULL) {
curl_multi_remove_handle (context->multi_handle,
curl_message->easy_handle);
gst_curl_http_src_remove_queue_handle (&context->queue,
curl_message->easy_handle, curl_message->data.result);
curl: Add curlhttpsrc element Merged from https://github.com/bbc/gst-curlhttpsrc commit f8aabcfc5c50a44f3362de831377d6e86dcd2d49 https://bugzilla.gnome.org/show_bug.cgi?id=744261
2017-07-25 14:23:57 +00:00
}
}
}
}
curlhttpsrc: fix various leaks and thread safety issues curlhttpsrc uses a single thread running the gst_curl_http_src_curl_multi_loop() function to handle receiving data and messages from libcurl. Each instance of curlhttpsrc adds an entry into a queue in GstCurlHttpSrcMultiTaskContext and waits for the multi_loop to perform the HTTP request. Valgrind has shown up race conditions and memory leaks: 1. gst_curl_http_src_change_state() does not wait for the multi_loop to complete before going to the NULL state, which means that an instance of GstCurlHttpSrc can be released while gst_curl_http_src_curl_multi_loop() still has a reference to it. 2. if multiple elements try to be removed from the queue at once, only the last one is deleted. 3. source->caps is leaked 4. curl multi_handle is leaked 5. leak of curl_handle if URI not set 6. leak of http_headers when reusing element 7. null pointer dereference in negotiate caps 8. double-free of the default user-agent string 9. leak of multi_task_context.task This commit changes the logic so that each element has a connection status, which is used by the multi_loop to decide when to remove an element from its queue. An instance of curlhttpsrc will not enter the NULL state until its reference has been removed from the queue. When shutting down the curl multi loop, the memory allocated from the call to curl_multi_init() is now released. When gstadaptivedemux uses a URI source element, it will re-use it for multiple requests, moving it between READY and PLAYING between each request. curlhttpsrc was leaking the http_headers structure in this use case. The gst_curl_http_src_negotiate_caps() function extracts the "response-headers" field from the http_headers, but did not check that this field might be NULL. If the user-agent property is set, the global user-agent string was freed. This caused a double-free error if the user-agent is ever set a second time during the execution of the process. There are situations within curlhttpsrc where the code needs both the global multi_task_context mutex and the per-element buffer_mutex. To avoid deadlocks, it is vital that the order in which these are requested is always the same. This commit modifies the locking order to always be in the order: 1. multi_task_context.task_rec_mutex 2. buffer_mutex Fixes #876
2019-02-05 16:34:40 +00:00
out:
g_mutex_unlock (&context->mutex);
curl: Add curlhttpsrc element Merged from https://github.com/bbc/gst-curlhttpsrc commit f8aabcfc5c50a44f3362de831377d6e86dcd2d49 https://bugzilla.gnome.org/show_bug.cgi?id=744261
2017-07-25 14:23:57 +00:00
}
/*
* Receive headers from the remote server and put them into the http_headers
* structure to be sent downstream when we've got them all and started receiving
* the body (see ::_handle_response())
*/
static size_t
gst_curl_http_src_get_header (void *header, size_t size, size_t nmemb,
void *src)
{
GstCurlHttpSrc *s = src;
char *substr;
GST_DEBUG_OBJECT (s, "Received header: %s", (char *) header);
g_mutex_lock (&s->buffer_mutex);
if (s->state == GSTCURL_UNLOCK) {
g_mutex_unlock (&s->buffer_mutex);
return size * nmemb;
}
if (s->http_headers == NULL) {
/* Can't do anything here, so just silently swallow the header */
GST_DEBUG_OBJECT (s, "HTTP Headers Structure has already been sent,"
" ignoring header");
g_mutex_unlock (&s->buffer_mutex);
return size * nmemb;
}
substr = gst_curl_http_src_strcasestr (header, "HTTP");
if (substr == header) {
/* We have a status line! */
gchar **status_line_fields;
/* Have we already seen a status line? If so, delete any response headers */
if (s->status_code > 0) {
curlhttpsrc: Fix flagged Coverity errors Fixes CIDs 1415707 - 1415717
2017-07-26 16:06:17 +00:00
GstStructure *empty_headers =
gst_structure_new_empty (RESPONSE_HEADERS_NAME);
curl: Add curlhttpsrc element Merged from https://github.com/bbc/gst-curlhttpsrc commit f8aabcfc5c50a44f3362de831377d6e86dcd2d49 https://bugzilla.gnome.org/show_bug.cgi?id=744261
2017-07-25 14:23:57 +00:00
gst_structure_remove_field (s->http_headers, RESPONSE_HEADERS_NAME);
gst_structure_set (s->http_headers, RESPONSE_HEADERS_NAME,
curlhttpsrc: Fix flagged Coverity errors Fixes CIDs 1415707 - 1415717
2017-07-26 16:06:17 +00:00
GST_TYPE_STRUCTURE, empty_headers, NULL);
gst_structure_free (empty_headers);
curl: Add curlhttpsrc element Merged from https://github.com/bbc/gst-curlhttpsrc commit f8aabcfc5c50a44f3362de831377d6e86dcd2d49 https://bugzilla.gnome.org/show_bug.cgi?id=744261
2017-07-25 14:23:57 +00:00
}
/* Process the status line */
status_line_fields = g_strsplit ((gchar *) header, " ", 3);
if (status_line_fields == NULL) {
GST_ERROR_OBJECT (s, "Status line processing failed!");
} else {
s->status_code =
(guint) g_ascii_strtoll (status_line_fields[1], NULL, 10);
curlhttpsrc: export same HTTP error status as souphttpsrc To make it closer to a drop-in replacement for souphttpsrc, expose the same gst_error_message_with_details as souphttpsrc, so that applications can received the HTTP status code and reason when an error occurs.
2019-02-05 17:06:50 +00:00
g_free (s->reason_phrase);
s->reason_phrase = g_strdup (status_line_fields[2]);
curl: Add curlhttpsrc element Merged from https://github.com/bbc/gst-curlhttpsrc commit f8aabcfc5c50a44f3362de831377d6e86dcd2d49 https://bugzilla.gnome.org/show_bug.cgi?id=744261
2017-07-25 14:23:57 +00:00
GST_INFO_OBJECT (s, "Received status %u for request for URI %s: %s",
curlhttpsrc: export same HTTP error status as souphttpsrc To make it closer to a drop-in replacement for souphttpsrc, expose the same gst_error_message_with_details as souphttpsrc, so that applications can received the HTTP status code and reason when an error occurs.
2019-02-05 17:06:50 +00:00
s->status_code, s->uri, s->reason_phrase);
curl: Add curlhttpsrc element Merged from https://github.com/bbc/gst-curlhttpsrc commit f8aabcfc5c50a44f3362de831377d6e86dcd2d49 https://bugzilla.gnome.org/show_bug.cgi?id=744261
2017-07-25 14:23:57 +00:00
gst_structure_set (s->http_headers, HTTP_STATUS_CODE,
G_TYPE_UINT, s->status_code, NULL);
g_strfreev (status_line_fields);
}
} else {
/* Normal header line */
gchar **header_tpl = g_strsplit ((gchar *) header, ": ", 2);
if (header_tpl == NULL) {
GST_ERROR_OBJECT (s, "Header processing failed! (%s)", (gchar *) header);
} else {
const GValue *gv_resp_hdrs = gst_structure_get_value (s->http_headers,
RESPONSE_HEADERS_NAME);
const GstStructure *response_headers =
gst_value_get_structure (gv_resp_hdrs);
/* Store header key lower case (g_ascii_strdown), makes searching through
* later on easier - end applications shouldn't care, as all HTTP headers
* are case-insensitive */
gchar *header_key = g_ascii_strdown (header_tpl[0], -1);
gchar *header_value;
/* If header field already exists, append to the end */
if (gst_structure_has_field (response_headers, header_key) == TRUE) {
header_value = g_strdup_printf ("%s, %s",
curlhttpsrc: fix various leaks and thread safety issues curlhttpsrc uses a single thread running the gst_curl_http_src_curl_multi_loop() function to handle receiving data and messages from libcurl. Each instance of curlhttpsrc adds an entry into a queue in GstCurlHttpSrcMultiTaskContext and waits for the multi_loop to perform the HTTP request. Valgrind has shown up race conditions and memory leaks: 1. gst_curl_http_src_change_state() does not wait for the multi_loop to complete before going to the NULL state, which means that an instance of GstCurlHttpSrc can be released while gst_curl_http_src_curl_multi_loop() still has a reference to it. 2. if multiple elements try to be removed from the queue at once, only the last one is deleted. 3. source->caps is leaked 4. curl multi_handle is leaked 5. leak of curl_handle if URI not set 6. leak of http_headers when reusing element 7. null pointer dereference in negotiate caps 8. double-free of the default user-agent string 9. leak of multi_task_context.task This commit changes the logic so that each element has a connection status, which is used by the multi_loop to decide when to remove an element from its queue. An instance of curlhttpsrc will not enter the NULL state until its reference has been removed from the queue. When shutting down the curl multi loop, the memory allocated from the call to curl_multi_init() is now released. When gstadaptivedemux uses a URI source element, it will re-use it for multiple requests, moving it between READY and PLAYING between each request. curlhttpsrc was leaking the http_headers structure in this use case. The gst_curl_http_src_negotiate_caps() function extracts the "response-headers" field from the http_headers, but did not check that this field might be NULL. If the user-agent property is set, the global user-agent string was freed. This caused a double-free error if the user-agent is ever set a second time during the execution of the process. There are situations within curlhttpsrc where the code needs both the global multi_task_context mutex and the per-element buffer_mutex. To avoid deadlocks, it is vital that the order in which these are requested is always the same. This commit modifies the locking order to always be in the order: 1. multi_task_context.task_rec_mutex 2. buffer_mutex Fixes #876
2019-02-05 16:34:40 +00:00
gst_structure_get_string (response_headers, header_key),
header_tpl[1]);
curl: Add curlhttpsrc element Merged from https://github.com/bbc/gst-curlhttpsrc commit f8aabcfc5c50a44f3362de831377d6e86dcd2d49 https://bugzilla.gnome.org/show_bug.cgi?id=744261
2017-07-25 14:23:57 +00:00
gst_structure_set ((GstStructure *) response_headers, header_key,
G_TYPE_STRING, header_value, NULL);
g_free (header_value);
} else {
header_value = header_tpl[1];
gst_structure_set ((GstStructure *) response_headers, header_key,
G_TYPE_STRING, header_value, NULL);
}
/* We have some special cases - deal with them here */
if (g_strcmp0 (header_key, "content-type") == 0) {
gst_curl_http_src_negotiate_caps (src);
curlhttpsrc: add support for range GET To allow curlhttpsrc to support DASH streams that use the on-demand profile, it needs to support HTTP Range GETs. In GStreamer, the RANGE is specified by issuing a GST_FORMAT_BYTES seek to set the start and end of the range. curlhttpsrc needs to implement seek and set the appropriate curl options to make it add the Range header to the request.
2019-05-24 16:33:33 +00:00
} else if (g_strcmp0 (header_key, "accept-ranges") == 0 &&
g_ascii_strcasecmp (header_value, "none") == 0) {
s->seekable = GSTCURL_SEEKABLE_FALSE;
} else if (g_strcmp0 (header_key, "content-range") == 0) {
/* In the case of a Range GET, the Content-Length header will contain
the size of range requested, and the Content-Range header will
have the start, stop and total size of the resource */
gchar *size = strchr (header_value, '/');
if (size) {
s->content_size = atoi (size);
}
curl: Add curlhttpsrc element Merged from https://github.com/bbc/gst-curlhttpsrc commit f8aabcfc5c50a44f3362de831377d6e86dcd2d49 https://bugzilla.gnome.org/show_bug.cgi?id=744261
2017-07-25 14:23:57 +00:00
}
g_free (header_key);
g_strfreev (header_tpl);
}
}
s->hdrs_updated = TRUE;
g_mutex_unlock (&s->buffer_mutex);
return size * nmemb;
}
/*
* My own quick and dirty implementation of strcasestr. This is a GNU extension
* (i.e. not portable) and not always guaranteed to be available.
*
* I know this doesn't work if the haystack and needle are the same size. But
* this isn't necessarily a bad thing, as the only place we currently use this
* is at a point where returning nothing even if a string match occurs but the
* needle is the same size as the haystack actually saves us time.
*/
static char *
gst_curl_http_src_strcasestr (const char *haystack, const char *needle)
{
int i, j, needle_len;
char *location;
needle_len = (int) strlen (needle);
i = 0;
j = 0;
location = NULL;
while (haystack[i] != '\0') {
if (j == needle_len) {
location = (char *) haystack + (i - j);
}
if (tolower (haystack[i]) == tolower (needle[j])) {
j++;
} else {
j = 0;
}
i++;
}
return location;
}
/*
* Receive chunks of the requested body and pass these back to the ::create()
* loop
*/
static size_t
gst_curl_http_src_get_chunks (void *chunk, size_t size, size_t nmemb, void *src)
{
GstCurlHttpSrc *s = src;
size_t chunk_len = size * nmemb;
GST_TRACE_OBJECT (s,
"Received curl chunk for URI %s of size %d", s->uri, (int) chunk_len);
g_mutex_lock (&s->buffer_mutex);
if (s->state == GSTCURL_UNLOCK) {
g_mutex_unlock (&s->buffer_mutex);
return chunk_len;
}
s->buffer =
g_realloc (s->buffer, (s->buffer_len + chunk_len + 1) * sizeof (char));
if (s->buffer == NULL) {
remove various useless linefeed in logs
2019-12-11 09:47:20 +00:00
GST_ERROR_OBJECT (s, "Realloc for cURL response message failed!");
curl: Add curlhttpsrc element Merged from https://github.com/bbc/gst-curlhttpsrc commit f8aabcfc5c50a44f3362de831377d6e86dcd2d49 https://bugzilla.gnome.org/show_bug.cgi?id=744261
2017-07-25 14:23:57 +00:00
return 0;
}
memcpy (s->buffer + s->buffer_len, chunk, chunk_len);
s->buffer_len += chunk_len;
curlhttpsrc: fix various leaks and thread safety issues curlhttpsrc uses a single thread running the gst_curl_http_src_curl_multi_loop() function to handle receiving data and messages from libcurl. Each instance of curlhttpsrc adds an entry into a queue in GstCurlHttpSrcMultiTaskContext and waits for the multi_loop to perform the HTTP request. Valgrind has shown up race conditions and memory leaks: 1. gst_curl_http_src_change_state() does not wait for the multi_loop to complete before going to the NULL state, which means that an instance of GstCurlHttpSrc can be released while gst_curl_http_src_curl_multi_loop() still has a reference to it. 2. if multiple elements try to be removed from the queue at once, only the last one is deleted. 3. source->caps is leaked 4. curl multi_handle is leaked 5. leak of curl_handle if URI not set 6. leak of http_headers when reusing element 7. null pointer dereference in negotiate caps 8. double-free of the default user-agent string 9. leak of multi_task_context.task This commit changes the logic so that each element has a connection status, which is used by the multi_loop to decide when to remove an element from its queue. An instance of curlhttpsrc will not enter the NULL state until its reference has been removed from the queue. When shutting down the curl multi loop, the memory allocated from the call to curl_multi_init() is now released. When gstadaptivedemux uses a URI source element, it will re-use it for multiple requests, moving it between READY and PLAYING between each request. curlhttpsrc was leaking the http_headers structure in this use case. The gst_curl_http_src_negotiate_caps() function extracts the "response-headers" field from the http_headers, but did not check that this field might be NULL. If the user-agent property is set, the global user-agent string was freed. This caused a double-free error if the user-agent is ever set a second time during the execution of the process. There are situations within curlhttpsrc where the code needs both the global multi_task_context mutex and the per-element buffer_mutex. To avoid deadlocks, it is vital that the order in which these are requested is always the same. This commit modifies the locking order to always be in the order: 1. multi_task_context.task_rec_mutex 2. buffer_mutex Fixes #876
2019-02-05 16:34:40 +00:00
g_cond_signal (&s->buffer_cond);
curl: Add curlhttpsrc element Merged from https://github.com/bbc/gst-curlhttpsrc commit f8aabcfc5c50a44f3362de831377d6e86dcd2d49 https://bugzilla.gnome.org/show_bug.cgi?id=744261
2017-07-25 14:23:57 +00:00
g_mutex_unlock (&s->buffer_mutex);
return chunk_len;
}
/*
* Request a cancellation of a currently running curl handle.
*/
static void
gst_curl_http_src_request_remove (GstCurlHttpSrc * src)
{
GstCurlHttpSrcClass *klass = G_TYPE_INSTANCE_GET_CLASS (src,
GST_TYPE_CURL_HTTP_SRC,
GstCurlHttpSrcClass);
curlhttpsrc: fix various leaks and thread safety issues curlhttpsrc uses a single thread running the gst_curl_http_src_curl_multi_loop() function to handle receiving data and messages from libcurl. Each instance of curlhttpsrc adds an entry into a queue in GstCurlHttpSrcMultiTaskContext and waits for the multi_loop to perform the HTTP request. Valgrind has shown up race conditions and memory leaks: 1. gst_curl_http_src_change_state() does not wait for the multi_loop to complete before going to the NULL state, which means that an instance of GstCurlHttpSrc can be released while gst_curl_http_src_curl_multi_loop() still has a reference to it. 2. if multiple elements try to be removed from the queue at once, only the last one is deleted. 3. source->caps is leaked 4. curl multi_handle is leaked 5. leak of curl_handle if URI not set 6. leak of http_headers when reusing element 7. null pointer dereference in negotiate caps 8. double-free of the default user-agent string 9. leak of multi_task_context.task This commit changes the logic so that each element has a connection status, which is used by the multi_loop to decide when to remove an element from its queue. An instance of curlhttpsrc will not enter the NULL state until its reference has been removed from the queue. When shutting down the curl multi loop, the memory allocated from the call to curl_multi_init() is now released. When gstadaptivedemux uses a URI source element, it will re-use it for multiple requests, moving it between READY and PLAYING between each request. curlhttpsrc was leaking the http_headers structure in this use case. The gst_curl_http_src_negotiate_caps() function extracts the "response-headers" field from the http_headers, but did not check that this field might be NULL. If the user-agent property is set, the global user-agent string was freed. This caused a double-free error if the user-agent is ever set a second time during the execution of the process. There are situations within curlhttpsrc where the code needs both the global multi_task_context mutex and the per-element buffer_mutex. To avoid deadlocks, it is vital that the order in which these are requested is always the same. This commit modifies the locking order to always be in the order: 1. multi_task_context.task_rec_mutex 2. buffer_mutex Fixes #876
2019-02-05 16:34:40 +00:00
g_mutex_lock (&klass->multi_task_context.mutex);
g_mutex_lock (&src->buffer_mutex);
if (src->connection_status == GSTCURL_CONNECTED) {
src->connection_status = GSTCURL_WANT_REMOVAL;
}
g_mutex_unlock (&src->buffer_mutex);
curl: Add curlhttpsrc element Merged from https://github.com/bbc/gst-curlhttpsrc commit f8aabcfc5c50a44f3362de831377d6e86dcd2d49 https://bugzilla.gnome.org/show_bug.cgi?id=744261
2017-07-25 14:23:57 +00:00
g_cond_signal (&klass->multi_task_context.signal);
g_mutex_unlock (&klass->multi_task_context.mutex);
}
curlhttpsrc: fix various leaks and thread safety issues curlhttpsrc uses a single thread running the gst_curl_http_src_curl_multi_loop() function to handle receiving data and messages from libcurl. Each instance of curlhttpsrc adds an entry into a queue in GstCurlHttpSrcMultiTaskContext and waits for the multi_loop to perform the HTTP request. Valgrind has shown up race conditions and memory leaks: 1. gst_curl_http_src_change_state() does not wait for the multi_loop to complete before going to the NULL state, which means that an instance of GstCurlHttpSrc can be released while gst_curl_http_src_curl_multi_loop() still has a reference to it. 2. if multiple elements try to be removed from the queue at once, only the last one is deleted. 3. source->caps is leaked 4. curl multi_handle is leaked 5. leak of curl_handle if URI not set 6. leak of http_headers when reusing element 7. null pointer dereference in negotiate caps 8. double-free of the default user-agent string 9. leak of multi_task_context.task This commit changes the logic so that each element has a connection status, which is used by the multi_loop to decide when to remove an element from its queue. An instance of curlhttpsrc will not enter the NULL state until its reference has been removed from the queue. When shutting down the curl multi loop, the memory allocated from the call to curl_multi_init() is now released. When gstadaptivedemux uses a URI source element, it will re-use it for multiple requests, moving it between READY and PLAYING between each request. curlhttpsrc was leaking the http_headers structure in this use case. The gst_curl_http_src_negotiate_caps() function extracts the "response-headers" field from the http_headers, but did not check that this field might be NULL. If the user-agent property is set, the global user-agent string was freed. This caused a double-free error if the user-agent is ever set a second time during the execution of the process. There are situations within curlhttpsrc where the code needs both the global multi_task_context mutex and the per-element buffer_mutex. To avoid deadlocks, it is vital that the order in which these are requested is always the same. This commit modifies the locking order to always be in the order: 1. multi_task_context.task_rec_mutex 2. buffer_mutex Fixes #876
2019-02-05 16:34:40 +00:00
/*
* Request a cancellation of a currently running curl handle and
* block this thread until the src element has been removed
* from the queue
*/
static void
gst_curl_http_src_wait_until_removed (GstCurlHttpSrc * src)
{
gst_curl_http_src_request_remove (src);
g_mutex_lock (&src->buffer_mutex);
while (src->connection_status != GSTCURL_NOT_CONNECTED) {
g_cond_wait (&src->buffer_cond, &src->buffer_mutex);
}
g_mutex_unlock (&src->buffer_mutex);
}
curlhttpsrc: Hook up libcurl logging message to gstreamer CURLOPT_DEBUGFUNCTION option replaces the standard debug function used when CURLOPT_VERBOSE is in effect. This callback receives various debug information.
2019-07-23 09:24:11 +00:00
#ifndef GST_DISABLE_GST_DEBUG
/*
* This callback receives debug information, as specified in the type argument.
* This function must return 0.
*/
static int
gst_curl_http_src_get_debug (CURL * handle, curl_infotype type, char *data,
size_t size, void *clientp)
{
GstCurlHttpSrc *src = (GstCurlHttpSrc *) clientp;
gchar *msg = NULL;
switch (type) {
case CURLINFO_TEXT:
case CURLINFO_HEADER_OUT:
Use g_memdup2() where available and add fallback for older GLib versions g_memdup() is deprecated since GLib 2.68 and we want to avoid deprecation warnings with recent versions of GLib. Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-bad/-/merge_requests/2280>
2021-05-23 18:15:25 +00:00
msg = g_memdup2 (data, size);
curlhttpsrc: Hook up libcurl logging message to gstreamer CURLOPT_DEBUGFUNCTION option replaces the standard debug function used when CURLOPT_VERBOSE is in effect. This callback receives various debug information.
2019-07-23 09:24:11 +00:00
if (size > 0) {
msg[size - 1] = '\0';
g_strchomp (msg);
}
break;
default:
break;
}
switch (type) {
case CURLINFO_TEXT:
GST_DEBUG_OBJECT (src, "%s", msg);
break;
case CURLINFO_HEADER_OUT:
GST_DEBUG_OBJECT (src, "outgoing header: %s", msg);
break;
case CURLINFO_DATA_IN:
GST_MEMDUMP_OBJECT (src, "incoming data", (guint8 *) data, size);
break;
case CURLINFO_DATA_OUT:
GST_MEMDUMP_OBJECT (src, "outgoing data", (guint8 *) data, size);
break;
case CURLINFO_SSL_DATA_IN:
GST_MEMDUMP_OBJECT (src, "incoming ssl data", (guint8 *) data, size);
break;
case CURLINFO_SSL_DATA_OUT:
GST_MEMDUMP_OBJECT (src, "outgoing ssl data", (guint8 *) data, size);
break;
default:
GST_DEBUG_OBJECT (src, "unknown debug info type %d", type);
GST_MEMDUMP_OBJECT (src, "unknown data", (guint8 *) data, size);
break;
}
g_free (msg);
return 0;
}
#endif
Reference in a new issue Copy permalink