gst-libs/gst/webrtc/dtlstransport.c

   1 /* GStreamer
   2  * Copyright (C) 2017 Matthew Waters <matthew@centricular.com>
   3  *
   4  * This library is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU Library General Public
   6  * License as published by the Free Software Foundation; either
   7  * version 2 of the License, or (at your option) any later version.
   8  *
   9  * This library is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  * Library General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU Library General Public
  15  * License along with this library; if not, write to the
  16  * Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
  17  * Boston, MA 02110-1301, USA.
  18  */
  19
  20 /**
  21  * SECTION:gstwebrtc-dtlstransport
  22  * @short_description: RTCDtlsTransport object
  23  * @title: GstWebRTCDTLSTransport
  24  * @see_also: #GstWebRTCRTPSender, #GstWebRTCRTPReceiver, #GstWebRTCICETransport
  25  *
  26  * <ulink url="https://www.w3.org/TR/webrtc/#rtcdtlstransport">https://www.w3.org/TR/webrtc/#rtcdtlstransport</ulink>
  27  */
  28
  29 #ifdef HAVE_CONFIG_H
  30 # include "config.h"
  31 #endif
  32
  33 #include "dtlstransport.h"
  34
  35 #define GST_CAT_DEFAULT gst_webrtc_dtls_transport_debug
  36 GST_DEBUG_CATEGORY_STATIC (GST_CAT_DEFAULT);
  37
  38 #define gst_webrtc_dtls_transport_parent_class parent_class
  39 G_DEFINE_TYPE_WITH_CODE (GstWebRTCDTLSTransport, gst_webrtc_dtls_transport,
  40     GST_TYPE_OBJECT, GST_DEBUG_CATEGORY_INIT (gst_webrtc_dtls_transport_debug,
  41         "dtlstransport", 0, "dtlstransport");
  42     );
  43
  44 enum
  45 {
  46   SIGNAL_0,
  47   LAST_SIGNAL,
  48 };
  49
  50 enum
  51 {
  52   PROP_0,
  53   PROP_SESSION_ID,
  54   PROP_TRANSPORT,
  55   PROP_STATE,
  56   PROP_CLIENT,
  57   PROP_CERTIFICATE,
  58   PROP_REMOTE_CERTIFICATE,
  59   PROP_RTCP,
  60 };
  61
  62 void
  63 gst_webrtc_dtls_transport_set_transport (GstWebRTCDTLSTransport * transport,
  64     GstWebRTCICETransport * ice)
  65 {
  66   g_return_if_fail (GST_IS_WEBRTC_DTLS_TRANSPORT (transport));
  67   g_return_if_fail (GST_IS_WEBRTC_ICE_TRANSPORT (ice));
  68
  69   gst_object_replace ((GstObject **) & transport->transport, GST_OBJECT (ice));
  70 }
  71
  72 static void
  73 gst_webrtc_dtls_transport_set_property (GObject * object, guint prop_id,
  74     const GValue * value, GParamSpec * pspec)
  75 {
  76   GstWebRTCDTLSTransport *webrtc = GST_WEBRTC_DTLS_TRANSPORT (object);
  77
  78   switch (prop_id) {
  79     case PROP_SESSION_ID:
  80       webrtc->session_id = g_value_get_uint (value);
  81       break;
  82     case PROP_CLIENT:
  83       g_object_set_property (G_OBJECT (webrtc->dtlssrtpenc), "is-client",
  84           value);
  85       gst_element_set_locked_state (webrtc->dtlssrtpenc, FALSE);
  86       gst_element_sync_state_with_parent (webrtc->dtlssrtpenc);
  87       break;
  88     case PROP_CERTIFICATE:
  89       g_object_set_property (G_OBJECT (webrtc->dtlssrtpdec), "pem", value);
  90       break;
  91     case PROP_RTCP:
  92       webrtc->is_rtcp = g_value_get_boolean (value);
  93       break;
  94     default:
  95       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
  96       break;
  97   }
  98 }
  99
 100 static void
 101 gst_webrtc_dtls_transport_get_property (GObject * object, guint prop_id,
 102     GValue * value, GParamSpec * pspec)
 103 {
 104   GstWebRTCDTLSTransport *webrtc = GST_WEBRTC_DTLS_TRANSPORT (object);
 105
 106   switch (prop_id) {
 107     case PROP_SESSION_ID:
 108       g_value_set_uint (value, webrtc->session_id);
 109       break;
 110     case PROP_TRANSPORT:
 111       g_value_set_object (value, webrtc->transport);
 112       break;
 113     case PROP_STATE:
 114       g_value_set_enum (value, webrtc->state);
 115       break;
 116     case PROP_CLIENT:
 117       g_object_get_property (G_OBJECT (webrtc->dtlssrtpenc), "is-client",
 118           value);
 119       break;
 120     case PROP_CERTIFICATE:
 121       g_object_get_property (G_OBJECT (webrtc->dtlssrtpdec), "pem", value);
 122       break;
 123     case PROP_REMOTE_CERTIFICATE:
 124       g_object_get_property (G_OBJECT (webrtc->dtlssrtpdec), "peer-pem", value);
 125       break;
 126     case PROP_RTCP:
 127       g_value_set_boolean (value, webrtc->is_rtcp);
 128       break;
 129     default:
 130       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
 131       break;
 132   }
 133 }
 134
 135 static void
 136 gst_webrtc_dtls_transport_finalize (GObject * object)
 137 {
 138   GstWebRTCDTLSTransport *webrtc = GST_WEBRTC_DTLS_TRANSPORT (object);
 139
 140   if (webrtc->transport) {
 141     gst_object_unref (webrtc->transport);
 142   }
 143   webrtc->transport = NULL;
 144
 145   G_OBJECT_CLASS (parent_class)->finalize (object);
 146 }
 147
 148 static void
 149 gst_webrtc_dtls_transport_constructed (GObject * object)
 150 {
 151   GstWebRTCDTLSTransport *webrtc = GST_WEBRTC_DTLS_TRANSPORT (object);
 152   gchar *connection_id;
 153
 154   /* XXX: this may collide with another connection_id however this is only a
 155    * problem if multiple dtls element sets are being used within the same
 156    * process */
 157   connection_id = g_strdup_printf ("%s_%u_%u", webrtc->is_rtcp ? "rtcp" : "rtp",
 158       webrtc->session_id, g_random_int ());
 159
 160   webrtc->dtlssrtpenc = gst_element_factory_make ("dtlssrtpenc", NULL);
 161   g_object_set (webrtc->dtlssrtpenc, "connection-id", connection_id,
 162       "is-client", webrtc->client, NULL);
 163
 164   webrtc->dtlssrtpdec = gst_element_factory_make ("dtlssrtpdec", NULL);
 165   g_object_set (webrtc->dtlssrtpdec, "connection-id", connection_id, NULL);
 166   g_free (connection_id);
 167
 168   G_OBJECT_CLASS (parent_class)->constructed (object);
 169 }
 170
 171 static void
 172 gst_webrtc_dtls_transport_class_init (GstWebRTCDTLSTransportClass * klass)
 173 {
 174   GObjectClass *gobject_class = (GObjectClass *) klass;
 175
 176   gobject_class->constructed = gst_webrtc_dtls_transport_constructed;
 177   gobject_class->get_property = gst_webrtc_dtls_transport_get_property;
 178   gobject_class->set_property = gst_webrtc_dtls_transport_set_property;
 179   gobject_class->finalize = gst_webrtc_dtls_transport_finalize;
 180
 181   g_object_class_install_property (gobject_class,
 182       PROP_SESSION_ID,
 183       g_param_spec_uint ("session-id", "Session ID",
 184           "Unique session ID", 0, G_MAXUINT, 0,
 185           G_PARAM_READWRITE | G_PARAM_CONSTRUCT_ONLY | G_PARAM_STATIC_STRINGS));
 186
 187   g_object_class_install_property (gobject_class,
 188       PROP_TRANSPORT,
 189       g_param_spec_object ("transport", "ICE transport",
 190           "ICE transport used by this dtls transport",
 191           GST_TYPE_WEBRTC_ICE_TRANSPORT,
 192           G_PARAM_READABLE | G_PARAM_STATIC_STRINGS));
 193
 194   /* FIXME: implement */
 195   g_object_class_install_property (gobject_class,
 196       PROP_STATE,
 197       g_param_spec_enum ("state", "DTLS state",
 198           "State of the DTLS transport",
 199           GST_TYPE_WEBRTC_DTLS_TRANSPORT_STATE,
 200           GST_WEBRTC_DTLS_TRANSPORT_STATE_NEW,
 201           G_PARAM_READABLE | G_PARAM_STATIC_STRINGS));
 202
 203   g_object_class_install_property (gobject_class,
 204       PROP_CLIENT,
 205       g_param_spec_boolean ("client", "DTLS client",
 206           "Are we the client in the DTLS handshake?", FALSE,
 207           G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
 208
 209   g_object_class_install_property (gobject_class,
 210       PROP_CERTIFICATE,
 211       g_param_spec_string ("certificate", "DTLS certificate",
 212           "DTLS certificate", NULL,
 213           G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
 214
 215   g_object_class_install_property (gobject_class,
 216       PROP_REMOTE_CERTIFICATE,
 217       g_param_spec_string ("remote-certificate", "Remote DTLS certificate",
 218           "Remote DTLS certificate", NULL,
 219           G_PARAM_READABLE | G_PARAM_STATIC_STRINGS));
 220
 221   g_object_class_install_property (gobject_class,
 222       PROP_RTCP,
 223       g_param_spec_boolean ("rtcp", "RTCP",
 224           "The transport is being used solely for RTCP", FALSE,
 225           G_PARAM_READWRITE | G_PARAM_CONSTRUCT_ONLY | G_PARAM_STATIC_STRINGS));
 226 }
 227
 228 static void
 229 gst_webrtc_dtls_transport_init (GstWebRTCDTLSTransport * webrtc)
 230 {
 231 }
 232
 233 GstWebRTCDTLSTransport *
 234 gst_webrtc_dtls_transport_new (guint session_id, gboolean is_rtcp)
 235 {
 236   return g_object_new (GST_TYPE_WEBRTC_DTLS_TRANSPORT, "session-id", session_id,
 237       "rtcp", is_rtcp, NULL);
 238 }