gstreamer/subprojects/gst-plugins-base/gst-libs/gst/rtsp/gstrtspurl.c
Sebastian Dröge 84ab8c9e12 rtsp: Add/fix various annotations
Also initialize out parameters so that they don't have an undefined
value in case of errors.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/3194>
2022-10-18 08:56:58 +00:00

448 lines
12 KiB
C

/* GStreamer
* Copyright (C) <2005,2006> Wim Taymans <wim@fluendo.com>
*
* 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., 51 Franklin St, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
/*
* Unless otherwise indicated, Source Code is licensed under MIT license.
* See further explanation attached in License Statement (distributed in the file
* LICENSE).
*
* 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.
*/
/**
* SECTION:gstrtspurl
* @title: GstRTSPUrl
* @short_description: handling RTSP urls
*
* Provides helper functions to handle RTSP urls.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <stdlib.h>
#include <string.h>
#include "gstrtspurl.h"
G_DEFINE_BOXED_TYPE (GstRTSPUrl, gst_rtsp_url,
(GBoxedCopyFunc) gst_rtsp_url_copy, (GBoxedFreeFunc) gst_rtsp_url_free);
static const struct
{
const char scheme[6];
GstRTSPLowerTrans transports;
} rtsp_schemes_map[] = {
{
"rtsp", GST_RTSP_LOWER_TRANS_TCP | GST_RTSP_LOWER_TRANS_UDP |
GST_RTSP_LOWER_TRANS_UDP_MCAST}, {
"rtspu", GST_RTSP_LOWER_TRANS_UDP | GST_RTSP_LOWER_TRANS_UDP_MCAST}, {
"rtspt", GST_RTSP_LOWER_TRANS_TCP}, {
"rtsph", GST_RTSP_LOWER_TRANS_HTTP | GST_RTSP_LOWER_TRANS_TCP}, {
"rtsps", GST_RTSP_LOWER_TRANS_TCP | GST_RTSP_LOWER_TRANS_UDP |
GST_RTSP_LOWER_TRANS_UDP_MCAST | GST_RTSP_LOWER_TRANS_TLS}, {
"rtspsu",
GST_RTSP_LOWER_TRANS_UDP | GST_RTSP_LOWER_TRANS_UDP_MCAST |
GST_RTSP_LOWER_TRANS_TLS}, {
"rtspst", GST_RTSP_LOWER_TRANS_TCP | GST_RTSP_LOWER_TRANS_TLS}, {
"rtspsh",
GST_RTSP_LOWER_TRANS_HTTP | GST_RTSP_LOWER_TRANS_TCP |
GST_RTSP_LOWER_TRANS_TLS}
};
/* format is rtsp[u]://[user:passwd@]host[:port]/abspath[?query] where host
* is a host name, an IPv4 dotted decimal address ("aaa.bbb.ccc.ddd") or an
* [IPv6] address ("[aabb:ccdd:eeff:gghh::sstt]" note the brackets around the
* address to allow the distinction between ':' as an IPv6 hexgroup separator
* and as a host/port separator) */
/**
* gst_rtsp_url_parse:
* @urlstr: the url string to parse
* @url: (out) (transfer full) (nullable): location to hold the result.
*
* Parse the RTSP @urlstr into a newly allocated #GstRTSPUrl. Free after usage
* with gst_rtsp_url_free().
*
* Returns: a #GstRTSPResult.
*/
GstRTSPResult
gst_rtsp_url_parse (const gchar * urlstr, GstRTSPUrl ** url)
{
GstRTSPUrl *res;
gchar *p, *delim, *at, *col;
gchar *host_end = NULL;
guint i;
g_return_val_if_fail (urlstr != NULL, GST_RTSP_EINVAL);
g_return_val_if_fail (url != NULL, GST_RTSP_EINVAL);
*url = NULL;
res = g_new0 (GstRTSPUrl, 1);
p = (gchar *) urlstr;
col = strstr (p, "://");
if (col == NULL)
goto invalid;
for (i = 0; i < G_N_ELEMENTS (rtsp_schemes_map); i++) {
if (g_ascii_strncasecmp (rtsp_schemes_map[i].scheme, p, col - p) == 0) {
res->transports = rtsp_schemes_map[i].transports;
p = col + 3;
break;
}
}
if (res->transports == GST_RTSP_LOWER_TRANS_UNKNOWN)
goto invalid;
delim = strpbrk (p, "/?");
at = strchr (p, '@');
if (at && delim && at > delim)
at = NULL;
if (at) {
col = strchr (p, ':');
/* must have a ':' and it must be before the '@' */
if (col == NULL || col > at)
goto invalid;
res->user = g_uri_unescape_segment (p, col, NULL);
col++;
res->passwd = g_uri_unescape_segment (col, at, NULL);
/* move to host */
p = at + 1;
}
if (*p == '[') {
res->family = GST_RTSP_FAM_INET6;
/* we have an IPv6 address in the URL, find the ending ] which must be
* before any delimiter */
host_end = strchr (++p, ']');
if (!host_end || (delim && host_end >= delim))
goto invalid;
/* a port specifier must follow the address immediately */
col = host_end[1] == ':' ? host_end + 1 : NULL;
} else {
res->family = GST_RTSP_FAM_INET;
col = strchr (p, ':');
/* we have a ':' and a delimiter but the ':' is after the delimiter, it's
* not really part of the hostname */
if (col && delim && col >= delim)
col = NULL;
host_end = col ? col : delim;
}
if (!host_end)
res->host = g_strdup (p);
else {
res->host = g_strndup (p, host_end - p);
if (col) {
res->port = strtoul (col + 1, NULL, 10);
} else {
/* no port specified, set to 0. gst_rtsp_url_get_port() will return the
* default port */
res->port = 0;
}
}
p = delim;
if (p && *p == '/') {
delim = strchr (p, '?');
if (!delim)
res->abspath = g_strdup (p);
else
res->abspath = g_strndup (p, delim - p);
p = delim;
} else {
/* IQinVision IQeye 1080p fails if a path '/' is provided
* and RTSP does not mandate that a non-zero-length path
* must be used */
res->abspath = g_strdup ("");
}
if (p && *p == '?')
res->query = g_strdup (p + 1);
*url = res;
return GST_RTSP_OK;
/* ERRORS */
invalid:
{
gst_rtsp_url_free (res);
return GST_RTSP_EINVAL;
}
}
/**
* gst_rtsp_url_copy:
* @url: a #GstRTSPUrl
*
* Make a copy of @url.
*
* Returns: (transfer full): a copy of @url. Free with gst_rtsp_url_free () after usage.
*/
GstRTSPUrl *
gst_rtsp_url_copy (const GstRTSPUrl * url)
{
GstRTSPUrl *res;
g_return_val_if_fail (url != NULL, NULL);
res = g_new0 (GstRTSPUrl, 1);
res->transports = url->transports;
res->family = url->family;
res->user = g_strdup (url->user);
res->passwd = g_strdup (url->passwd);
res->host = g_strdup (url->host);
res->port = url->port;
res->abspath = g_strdup (url->abspath);
res->query = g_strdup (url->query);
return res;
}
/**
* gst_rtsp_url_free:
* @url: a #GstRTSPUrl
*
* Free the memory used by @url.
*/
void
gst_rtsp_url_free (GstRTSPUrl * url)
{
if (url == NULL)
return;
g_free (url->user);
g_free (url->passwd);
g_free (url->host);
g_free (url->abspath);
g_free (url->query);
g_free (url);
}
/**
* gst_rtsp_url_set_port:
* @url: a #GstRTSPUrl
* @port: the port
*
* Set the port number in @url to @port.
*
* Returns: #GST_RTSP_OK.
*/
GstRTSPResult
gst_rtsp_url_set_port (GstRTSPUrl * url, guint16 port)
{
g_return_val_if_fail (url != NULL, GST_RTSP_EINVAL);
url->port = port;
return GST_RTSP_OK;
}
/**
* gst_rtsp_url_get_port:
* @url: a #GstRTSPUrl
* @port: (out): location to hold the port
*
* Get the port number of @url.
*
* Returns: #GST_RTSP_OK.
*/
GstRTSPResult
gst_rtsp_url_get_port (const GstRTSPUrl * url, guint16 * port)
{
g_return_val_if_fail (url != NULL, GST_RTSP_EINVAL);
g_return_val_if_fail (port != NULL, GST_RTSP_EINVAL);
/* if a port was specified, use that else use the default port. */
if (url->port != 0)
*port = url->port;
else
*port = GST_RTSP_DEFAULT_PORT;
return GST_RTSP_OK;
}
/**
* gst_rtsp_url_get_request_uri:
* @url: a #GstRTSPUrl
*
* Get a newly allocated string describing the request URI for @url.
*
* Returns: (transfer full): a string with the request URI. g_free() after usage.
*/
gchar *
gst_rtsp_url_get_request_uri (const GstRTSPUrl * url)
{
gchar *uri;
const gchar *pre_host;
const gchar *post_host;
const gchar *pre_query;
const gchar *query;
g_return_val_if_fail (url != NULL, NULL);
pre_host = url->family == GST_RTSP_FAM_INET6 ? "[" : "";
post_host = url->family == GST_RTSP_FAM_INET6 ? "]" : "";
pre_query = url->query ? "?" : "";
query = url->query ? url->query : "";
if (url->port != 0) {
uri = g_strdup_printf ("rtsp://%s%s%s:%u%s%s%s", pre_host, url->host,
post_host, url->port, url->abspath, pre_query, query);
} else {
uri = g_strdup_printf ("rtsp://%s%s%s%s%s%s", pre_host, url->host,
post_host, url->abspath, pre_query, query);
}
return uri;
}
/**
* gst_rtsp_url_get_request_uri_with_control:
* @url: a #GstRTSPUrl
* @control_path: an RTSP aggregate control path
*
* Get a newly allocated string describing the request URI for @url
* combined with the control path for @control_path
*
* Returns: (transfer full): a string with the request URI combined with the control path.
* g_free() after usage.
*
* Since: 1.18
*/
gchar *
gst_rtsp_url_get_request_uri_with_control (const GstRTSPUrl * url,
const gchar * control_path)
{
gchar *url_string;
gchar *uri;
g_return_val_if_fail (url != NULL, NULL);
/* FIXME: Use GUri here once we can depend on GLib 2.66 */
url_string = gst_rtsp_url_get_request_uri (url);
uri = gst_uri_join_strings (url_string, control_path);
g_clear_pointer (&url_string, g_free);
return uri;
}
static int
hex_to_int (gchar c)
{
if (c >= '0' && c <= '9')
return c - '0';
else if (c >= 'a' && c <= 'f')
return c - 'a' + 10;
else if (c >= 'A' && c <= 'F')
return c - 'A' + 10;
else
return -1;
}
static void
unescape_path_component (gchar * comp)
{
guint len = strlen (comp);
guint i;
for (i = 0; i + 2 < len; i++)
if (comp[i] == '%') {
int a, b;
a = hex_to_int (comp[i + 1]);
b = hex_to_int (comp[i + 2]);
/* The a||b check is to ensure that the byte is not '\0' */
if (a >= 0 && b >= 0 && (a || b)) {
comp[i] = (gchar) (a * 16 + b);
memmove (comp + i + 1, comp + i + 3, len - i - 3);
len -= 2;
comp[len] = '\0';
}
}
}
/**
* gst_rtsp_url_decode_path_components:
* @url: a #GstRTSPUrl
*
* Splits the path of @url on '/' boundaries, decoding the resulting components,
*
* The decoding performed by this routine is "URI decoding", as defined in RFC
* 3986, commonly known as percent-decoding. For example, a string "foo\%2fbar"
* will decode to "foo/bar" -- the \%2f being replaced by the corresponding byte
* with hex value 0x2f. Note that there is no guarantee that the resulting byte
* sequence is valid in any given encoding. As a special case, \%00 is not
* unescaped to NUL, as that would prematurely terminate the string.
*
* Also note that since paths usually start with a slash, the first component
* will usually be the empty string.
*
* Returns: (transfer full): %NULL-terminated array of URL components. Free with
* g_strfreev() when no longer needed.
*/
gchar **
gst_rtsp_url_decode_path_components (const GstRTSPUrl * url)
{
gchar **ret;
guint i;
g_return_val_if_fail (url != NULL, NULL);
g_return_val_if_fail (url->abspath != NULL, NULL);
ret = g_strsplit (url->abspath, "/", -1);
for (i = 0; ret[i]; i++)
unescape_path_component (ret[i]);
return ret;
}