Commit graph

8 commits

Author SHA1 Message Date
Alex Ashley
e9c68347f0 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.
2019-11-17 14:28:25 +00:00
Aaron Boxer
6d3429af34 documentation: fixed a heap o' typos 2019-11-05 09:11:25 -05:00
Alex Ashley
2d806477d0 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.
2019-02-19 17:55:12 +00:00
Alex Ashley
c2fe4e58ad 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
2019-02-19 17:55:12 +00:00
Alex Ashley
048d703577 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 17:59:31 +03:00
Philippe Normand
5bf092bd64 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
2017-08-08 09:06:49 +01:00
Sam Hurst
b922edce7b curl: Reorganise header files to fix macOS builds
https://bugzilla.gnome.org/show_bug.cgi?id=744261
2017-07-26 18:57:38 +01:00
Sam Hurst
e74b3a02dd curl: Add curlhttpsrc element
Merged from https://github.com/bbc/gst-curlhttpsrc commit
  f8aabcfc5c50a44f3362de831377d6e86dcd2d49

https://bugzilla.gnome.org/show_bug.cgi?id=744261
2017-07-26 09:52:20 +03:00