mirror of
https://gitlab.freedesktop.org/gstreamer/gstreamer.git
synced 2024-12-15 04:46:32 +00:00
d3f92b9760
Previously, reassigning loop index l in nicestream.c could cause a segfault if l->data was null, as it could reassign l to a null variable, triggering the loop postassignment l->next, which then segfaults due to l now being null. It is instead moved into the loop. _delete_transport already performs the reassignment inline. Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/4192>
338 lines
9.1 KiB
C
338 lines
9.1 KiB
C
/* GStreamer
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* Copyright (C) 2017 Matthew Waters <matthew@centricular.com>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
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* Boston, MA 02110-1301, USA.
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*/
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#ifdef HAVE_CONFIG_H
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# include "config.h"
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#endif
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#include "nicestream.h"
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#include "nicetransport.h"
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#define GST_CAT_DEFAULT gst_webrtc_nice_stream_debug
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GST_DEBUG_CATEGORY_STATIC (GST_CAT_DEFAULT);
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enum
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{
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PROP_0,
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PROP_ICE,
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};
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struct _GstWebRTCNiceStreamPrivate
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{
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gboolean gathered;
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GList *transports;
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gboolean gathering_started;
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gulong candidate_gathering_done_id;
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GWeakRef ice_weak;
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};
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#define gst_webrtc_nice_stream_parent_class parent_class
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G_DEFINE_TYPE_WITH_CODE (GstWebRTCNiceStream, gst_webrtc_nice_stream,
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GST_TYPE_WEBRTC_ICE_STREAM, G_ADD_PRIVATE (GstWebRTCNiceStream)
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GST_DEBUG_CATEGORY_INIT (gst_webrtc_nice_stream_debug,
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"webrtcnicestream", 0, "webrtcnicestream"););
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static void
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gst_webrtc_nice_stream_set_property (GObject * object, guint prop_id,
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const GValue * value, GParamSpec * pspec)
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{
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GstWebRTCNiceStream *stream = GST_WEBRTC_NICE_STREAM (object);
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switch (prop_id) {
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case PROP_ICE:
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g_weak_ref_set (&stream->priv->ice_weak, g_value_get_object (value));
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break;
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default:
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G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
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break;
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}
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}
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static void
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gst_webrtc_nice_stream_get_property (GObject * object, guint prop_id,
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GValue * value, GParamSpec * pspec)
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{
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GstWebRTCNiceStream *stream = GST_WEBRTC_NICE_STREAM (object);
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switch (prop_id) {
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case PROP_ICE:
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g_value_take_object (value, g_weak_ref_get (&stream->priv->ice_weak));
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break;
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default:
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G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
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break;
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}
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}
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static GWeakRef *
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weak_new (gpointer object)
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{
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GWeakRef *weak = g_new0 (GWeakRef, 1);
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g_weak_ref_init (weak, object);
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return weak;
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}
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static void
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weak_free (GWeakRef * weak)
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{
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g_weak_ref_clear (weak);
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g_free (weak);
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}
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static void
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gst_webrtc_nice_stream_finalize (GObject * object)
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{
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GstWebRTCNiceStream *stream = GST_WEBRTC_NICE_STREAM (object);
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GstWebRTCNice *ice = g_weak_ref_get (&stream->priv->ice_weak);
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if (ice) {
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NiceAgent *agent;
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g_object_get (ice, "agent", &agent, NULL);
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if (stream->priv->candidate_gathering_done_id != 0) {
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g_signal_handler_disconnect (agent,
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stream->priv->candidate_gathering_done_id);
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}
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g_object_unref (agent);
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gst_object_unref (ice);
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}
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g_list_foreach (stream->priv->transports, (GFunc) weak_free, NULL);
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g_list_free (stream->priv->transports);
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stream->priv->transports = NULL;
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g_weak_ref_clear (&stream->priv->ice_weak);
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G_OBJECT_CLASS (parent_class)->finalize (object);
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}
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static GList *
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_delete_transport (GList ** transports, GList * link)
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{
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GList *next = link->next;
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weak_free (link->data);
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*transports = g_list_delete_link (*transports, link);
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return next;
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}
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static void
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_on_candidate_gathering_done (NiceAgent * agent, guint stream_id,
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GWeakRef * ice_weak)
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{
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GstWebRTCNiceStream *ice = g_weak_ref_get (ice_weak);
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GList *l;
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if (!ice)
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return;
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if (stream_id != GST_WEBRTC_ICE_STREAM (ice)->stream_id)
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goto cleanup;
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GST_DEBUG_OBJECT (ice, "%u gathering done", stream_id);
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ice->priv->gathered = TRUE;
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for (l = ice->priv->transports; l;) {
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GstWebRTCICETransport *trans = g_weak_ref_get (l->data);
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if (trans) {
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gst_webrtc_ice_transport_gathering_state_change (trans,
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GST_WEBRTC_ICE_GATHERING_STATE_COMPLETE);
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g_object_unref (trans);
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l = l->next;
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} else {
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l = _delete_transport (&ice->priv->transports, l);
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}
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}
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cleanup:
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gst_object_unref (ice);
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}
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static GstWebRTCICETransport *
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gst_webrtc_nice_stream_find_transport (GstWebRTCICEStream * stream,
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GstWebRTCICEComponent component)
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{
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GstWebRTCICEComponent trans_comp;
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GstWebRTCICETransport *ret;
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GList *l;
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GstWebRTCNiceStream *nice_stream = GST_WEBRTC_NICE_STREAM (stream);
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for (l = nice_stream->priv->transports; l;) {
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GstWebRTCICETransport *trans = g_weak_ref_get (l->data);
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if (trans) {
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g_object_get (trans, "component", &trans_comp, NULL);
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if (component == trans_comp)
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return trans;
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else
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gst_object_unref (trans);
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l = l->next;
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} else {
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l = _delete_transport (&nice_stream->priv->transports, l);
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}
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}
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ret =
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GST_WEBRTC_ICE_TRANSPORT (gst_webrtc_nice_transport_new (nice_stream,
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component));
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nice_stream->priv->transports =
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g_list_prepend (nice_stream->priv->transports, weak_new (ret));
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return ret;
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}
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static void
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gst_webrtc_nice_stream_constructed (GObject * object)
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{
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GstWebRTCNiceStream *stream;
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NiceAgent *agent;
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GstWebRTCNice *ice;
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G_OBJECT_CLASS (parent_class)->constructed (object);
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stream = GST_WEBRTC_NICE_STREAM (object);
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ice = g_weak_ref_get (&stream->priv->ice_weak);
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g_assert (ice != NULL);
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g_object_get (ice, "agent", &agent, NULL);
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stream->priv->candidate_gathering_done_id = g_signal_connect_data (agent,
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"candidate-gathering-done", G_CALLBACK (_on_candidate_gathering_done),
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weak_new (stream), (GClosureNotify) weak_free, (GConnectFlags) 0);
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g_object_unref (agent);
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gst_object_unref (ice);
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}
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static gboolean
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gst_webrtc_nice_stream_gather_candidates (GstWebRTCICEStream * stream)
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{
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NiceAgent *agent;
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GList *l;
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GstWebRTCICE *ice;
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gboolean ret = TRUE;
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GstWebRTCNiceStream *nice_stream = GST_WEBRTC_NICE_STREAM (stream);
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GST_DEBUG_OBJECT (nice_stream, "start gathering candidates");
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if (nice_stream->priv->gathered)
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return TRUE;
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for (l = nice_stream->priv->transports; l;) {
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GstWebRTCICETransport *trans = g_weak_ref_get (l->data);
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if (trans) {
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gst_webrtc_ice_transport_gathering_state_change (trans,
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GST_WEBRTC_ICE_GATHERING_STATE_GATHERING);
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g_object_unref (trans);
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l = l->next;
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} else {
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l = _delete_transport (&nice_stream->priv->transports, l);
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}
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}
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ice = GST_WEBRTC_ICE (g_weak_ref_get (&nice_stream->priv->ice_weak));
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g_assert (ice != NULL);
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g_object_get (ice, "agent", &agent, NULL);
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if (!nice_stream->priv->gathering_started) {
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if (ice->min_rtp_port != 0 || ice->max_rtp_port != 65535) {
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if (ice->min_rtp_port > ice->max_rtp_port) {
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GST_ERROR_OBJECT (ice,
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"invalid port range: min-rtp-port %d must be <= max-rtp-port %d",
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ice->min_rtp_port, ice->max_rtp_port);
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ret = FALSE;
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goto cleanup;
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}
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nice_agent_set_port_range (agent, stream->stream_id,
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NICE_COMPONENT_TYPE_RTP, ice->min_rtp_port, ice->max_rtp_port);
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}
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/* mark as gathering started to prevent changing ports again */
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nice_stream->priv->gathering_started = TRUE;
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}
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if (!nice_agent_gather_candidates (agent, stream->stream_id)) {
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ret = FALSE;
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goto cleanup;
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}
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for (l = nice_stream->priv->transports; l;) {
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GstWebRTCNiceTransport *trans = g_weak_ref_get (l->data);
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if (trans) {
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gst_webrtc_nice_transport_update_buffer_size (trans);
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g_object_unref (trans);
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l = l->next;
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} else {
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l = _delete_transport (&nice_stream->priv->transports, l);
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}
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}
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cleanup:
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if (agent)
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g_object_unref (agent);
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if (ice)
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gst_object_unref (ice);
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return ret;
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}
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static void
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gst_webrtc_nice_stream_class_init (GstWebRTCNiceStreamClass * klass)
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{
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GObjectClass *gobject_class = (GObjectClass *) klass;
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GstWebRTCICEStreamClass *gst_webrtc_ice_stream_class =
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GST_WEBRTC_ICE_STREAM_CLASS (klass);
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gst_webrtc_ice_stream_class->find_transport =
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gst_webrtc_nice_stream_find_transport;
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gst_webrtc_ice_stream_class->gather_candidates =
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gst_webrtc_nice_stream_gather_candidates;
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gobject_class->constructed = gst_webrtc_nice_stream_constructed;
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gobject_class->get_property = gst_webrtc_nice_stream_get_property;
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gobject_class->set_property = gst_webrtc_nice_stream_set_property;
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gobject_class->finalize = gst_webrtc_nice_stream_finalize;
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g_object_class_install_property (gobject_class,
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PROP_ICE,
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g_param_spec_object ("ice",
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"ICE", "ICE agent associated with this stream",
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GST_TYPE_WEBRTC_ICE,
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G_PARAM_READWRITE | G_PARAM_CONSTRUCT_ONLY | G_PARAM_STATIC_STRINGS));
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}
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static void
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gst_webrtc_nice_stream_init (GstWebRTCNiceStream * stream)
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{
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stream->priv = gst_webrtc_nice_stream_get_instance_private (stream);
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g_weak_ref_init (&stream->priv->ice_weak, NULL);
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}
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GstWebRTCNiceStream *
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gst_webrtc_nice_stream_new (GstWebRTCICE * ice, guint stream_id)
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{
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return g_object_new (GST_TYPE_WEBRTC_NICE_STREAM, "ice", ice,
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"stream-id", stream_id, NULL);
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}
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