| /* |
| * Copyright (c) 2014, Ericsson AB. All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without modification, |
| * are permitted provided that the following conditions are met: |
| * |
| * 1. Redistributions of source code must retain the above copyright notice, this |
| * list of conditions and the following disclaimer. |
| * |
| * 2. Redistributions in binary form must reproduce the above copyright notice, this |
| * list of conditions and the following disclaimer in the documentation and/or other |
| * materials provided with the distribution. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND |
| * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED |
| * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
| * IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, |
| * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
| * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR |
| * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, |
| * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
| * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY |
| * OF SUCH DAMAGE. |
| */ |
| |
| #ifdef HAVE_CONFIG_H |
| #include "config.h" |
| #endif |
| |
| #include "gstdtlssrtpenc.h" |
| |
| #include <stdio.h> |
| |
| static GstStaticPadTemplate rtp_sink_template = |
| GST_STATIC_PAD_TEMPLATE ("rtp_sink_%d", |
| GST_PAD_SINK, |
| GST_PAD_REQUEST, |
| GST_STATIC_CAPS ("application/x-rtp;application/x-rtcp") |
| ); |
| |
| static GstStaticPadTemplate rtcp_sink_template = |
| GST_STATIC_PAD_TEMPLATE ("rtcp_sink_%d", |
| GST_PAD_SINK, |
| GST_PAD_REQUEST, |
| GST_STATIC_CAPS ("application/x-rtp;application/x-rtcp") |
| ); |
| |
| static GstStaticPadTemplate data_sink_template = |
| GST_STATIC_PAD_TEMPLATE ("data_sink", |
| GST_PAD_SINK, |
| GST_PAD_REQUEST, |
| GST_STATIC_CAPS_ANY); |
| |
| static GstStaticPadTemplate src_template = GST_STATIC_PAD_TEMPLATE ("src", |
| GST_PAD_SRC, |
| GST_PAD_ALWAYS, |
| GST_STATIC_CAPS_ANY); |
| |
| GST_DEBUG_CATEGORY_STATIC (gst_dtls_srtp_enc_debug); |
| #define GST_CAT_DEFAULT gst_dtls_srtp_enc_debug |
| |
| #define gst_dtls_srtp_enc_parent_class parent_class |
| G_DEFINE_TYPE_WITH_CODE (GstDtlsSrtpEnc, gst_dtls_srtp_enc, |
| GST_TYPE_DTLS_SRTP_BIN, GST_DEBUG_CATEGORY_INIT (gst_dtls_srtp_enc_debug, |
| "dtlssrtpenc", 0, "DTLS Decoder")); |
| |
| enum |
| { |
| SIGNAL_ON_KEY_SET, |
| NUM_SIGNALS |
| }; |
| |
| static guint signals[NUM_SIGNALS]; |
| |
| enum |
| { |
| PROP_0, |
| PROP_IS_CLIENT, |
| NUM_PROPERTIES |
| }; |
| |
| static GParamSpec *properties[NUM_PROPERTIES]; |
| |
| #define DEFAULT_IS_CLIENT FALSE |
| |
| static gboolean transform_enum (GBinding *, const GValue * source_value, |
| GValue * target_value, GEnumClass *); |
| |
| static void gst_dtls_srtp_enc_set_property (GObject *, guint prop_id, |
| const GValue *, GParamSpec *); |
| static void gst_dtls_srtp_enc_get_property (GObject *, guint prop_id, |
| GValue *, GParamSpec *); |
| |
| static GstPad *add_ghost_pad (GstElement *, const gchar * name, GstPad *, |
| GstPadTemplate *); |
| static GstPad *gst_dtls_srtp_enc_request_new_pad (GstElement *, |
| GstPadTemplate *, const gchar * name, const GstCaps *); |
| |
| static void on_key_received (GObject * encoder, GstDtlsSrtpEnc *); |
| |
| static void gst_dtls_srtp_enc_remove_dtls_element (GstDtlsSrtpBin *); |
| static GstPadProbeReturn remove_dtls_encoder_probe_callback (GstPad *, |
| GstPadProbeInfo *, GstElement *); |
| |
| static void |
| gst_dtls_srtp_enc_class_init (GstDtlsSrtpEncClass * klass) |
| { |
| GObjectClass *gobject_class; |
| GstElementClass *element_class; |
| GstDtlsSrtpBinClass *dtls_srtp_bin_class; |
| |
| gobject_class = (GObjectClass *) klass; |
| element_class = (GstElementClass *) klass; |
| dtls_srtp_bin_class = (GstDtlsSrtpBinClass *) klass; |
| |
| gobject_class->set_property = |
| GST_DEBUG_FUNCPTR (gst_dtls_srtp_enc_set_property); |
| gobject_class->get_property = |
| GST_DEBUG_FUNCPTR (gst_dtls_srtp_enc_get_property); |
| |
| element_class->request_new_pad = |
| GST_DEBUG_FUNCPTR (gst_dtls_srtp_enc_request_new_pad); |
| |
| dtls_srtp_bin_class->remove_dtls_element = |
| GST_DEBUG_FUNCPTR (gst_dtls_srtp_enc_remove_dtls_element); |
| |
| signals[SIGNAL_ON_KEY_SET] = |
| g_signal_new ("on-key-set", G_TYPE_FROM_CLASS (klass), |
| G_SIGNAL_RUN_LAST, 0, NULL, NULL, |
| g_cclosure_marshal_generic, G_TYPE_NONE, 0); |
| |
| properties[PROP_IS_CLIENT] = |
| g_param_spec_boolean ("is-client", |
| "Is client", |
| "Set to true if the decoder should act as " |
| "client and initiate the handshake", |
| DEFAULT_IS_CLIENT, |
| GST_PARAM_MUTABLE_READY | G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS); |
| |
| g_object_class_install_properties (gobject_class, NUM_PROPERTIES, properties); |
| |
| gst_element_class_add_pad_template (element_class, |
| gst_static_pad_template_get (&rtp_sink_template)); |
| gst_element_class_add_pad_template (element_class, |
| gst_static_pad_template_get (&rtcp_sink_template)); |
| gst_element_class_add_pad_template (element_class, |
| gst_static_pad_template_get (&data_sink_template)); |
| gst_element_class_add_pad_template (element_class, |
| gst_static_pad_template_get (&src_template)); |
| |
| gst_element_class_set_static_metadata (element_class, |
| "DTLS-SRTP Encoder", |
| "Encoder/Network/DTLS/SRTP", |
| "Encodes SRTP packets with a key received from DTLS", |
| "Patrik Oldsberg patrik.oldsberg@ericsson.com"); |
| } |
| |
| static void |
| gst_dtls_srtp_enc_init (GstDtlsSrtpEnc * self) |
| { |
| GstElementClass *klass = GST_ELEMENT_GET_CLASS (GST_ELEMENT (self)); |
| static GEnumClass *cipher_enum_class, *auth_enum_class; |
| gboolean ret; |
| |
| /* |
| +--------------------+ +-----------------+ |
| rtp_sink-R-o|rtp_sink rtp_src|o-R-o| | |
| | srtpenc | | | |
| rtcp_sink-R-o|srtcp_sink rtcp_src|o-R-o| | |
| +--------------------+ | funnel |o---src |
| | | |
| +--------------------+ | | |
| data_sink-R-o| dtlsenc |o---o| | |
| +--------------------+ +-----------------+ |
| */ |
| |
| self->srtp_enc = gst_element_factory_make ("srtpenc", "srtp-encoder"); |
| if (!self->srtp_enc) { |
| GST_ERROR_OBJECT (self, |
| "failed to create srtp encoder, is the srtp plugin registered?"); |
| return; |
| } |
| g_return_if_fail (self->srtp_enc); |
| self->bin.dtls_element = gst_element_factory_make ("dtlsenc", "dtls-encoder"); |
| if (!self->bin.dtls_element) { |
| GST_ERROR_OBJECT (self, "failed to create dtls encoder"); |
| return; |
| } |
| self->funnel = gst_element_factory_make ("funnel", "funnel"); |
| if (!self->funnel) { |
| GST_ERROR_OBJECT (self, "failed to create funnel"); |
| return; |
| } |
| |
| gst_bin_add_many (GST_BIN (self), self->bin.dtls_element, self->srtp_enc, |
| self->funnel, NULL); |
| |
| ret = gst_element_link (self->bin.dtls_element, self->funnel); |
| g_return_if_fail (ret); |
| |
| add_ghost_pad (GST_ELEMENT (self), "src", |
| gst_element_get_static_pad (self->funnel, "src"), |
| gst_element_class_get_pad_template (klass, "src")); |
| |
| g_signal_connect (self->bin.dtls_element, "on-key-received", |
| G_CALLBACK (on_key_received), self); |
| |
| if (g_once_init_enter (&cipher_enum_class)) { |
| GType type = g_type_from_name ("GstSrtpCipherType"); |
| g_assert (type); |
| g_once_init_leave (&cipher_enum_class, g_type_class_peek (type)); |
| } |
| if (g_once_init_enter (&auth_enum_class)) { |
| GType type = g_type_from_name ("GstSrtpAuthType"); |
| g_assert (type); |
| g_once_init_leave (&auth_enum_class, g_type_class_peek (type)); |
| } |
| |
| g_object_set (self->srtp_enc, "random-key", TRUE, NULL); |
| |
| g_object_bind_property (G_OBJECT (self), "key", self->srtp_enc, "key", |
| G_BINDING_DEFAULT); |
| g_object_bind_property_full (G_OBJECT (self), "srtp-cipher", self->srtp_enc, |
| "rtp-cipher", G_BINDING_DEFAULT, (GBindingTransformFunc) transform_enum, |
| NULL, cipher_enum_class, NULL); |
| g_object_bind_property_full (G_OBJECT (self), "srtcp-cipher", self->srtp_enc, |
| "rtcp-cipher", G_BINDING_DEFAULT, (GBindingTransformFunc) transform_enum, |
| NULL, cipher_enum_class, NULL); |
| g_object_bind_property_full (G_OBJECT (self), "srtp-auth", self->srtp_enc, |
| "rtp-auth", G_BINDING_DEFAULT, (GBindingTransformFunc) transform_enum, |
| NULL, auth_enum_class, NULL); |
| g_object_bind_property_full (G_OBJECT (self), "srtcp-auth", self->srtp_enc, |
| "rtcp-auth", G_BINDING_DEFAULT, (GBindingTransformFunc) transform_enum, |
| NULL, auth_enum_class, NULL); |
| } |
| |
| static gboolean |
| transform_enum (GBinding * binding, const GValue * source_value, |
| GValue * target_value, GEnumClass * enum_class) |
| { |
| GEnumValue *enum_value; |
| const gchar *nick; |
| |
| nick = g_value_get_string (source_value); |
| g_return_val_if_fail (nick, FALSE); |
| |
| enum_value = g_enum_get_value_by_nick (enum_class, nick); |
| g_return_val_if_fail (enum_value, FALSE); |
| |
| GST_DEBUG_OBJECT (g_binding_get_source (binding), |
| "transforming enum from %s to %d", nick, enum_value->value); |
| |
| g_value_set_enum (target_value, enum_value->value); |
| |
| return TRUE; |
| } |
| |
| static void |
| gst_dtls_srtp_enc_set_property (GObject * object, |
| guint prop_id, const GValue * value, GParamSpec * pspec) |
| { |
| GstDtlsSrtpEnc *self = GST_DTLS_SRTP_ENC (object); |
| |
| switch (prop_id) { |
| case PROP_IS_CLIENT: |
| if (self->bin.dtls_element) { |
| g_object_set_property (G_OBJECT (self->bin.dtls_element), "is-client", |
| value); |
| } else { |
| GST_WARNING_OBJECT (self, |
| "tried to set is-client after disabling DTLS"); |
| } |
| break; |
| default: |
| G_OBJECT_WARN_INVALID_PROPERTY_ID (self, prop_id, pspec); |
| } |
| } |
| |
| static void |
| gst_dtls_srtp_enc_get_property (GObject * object, |
| guint prop_id, GValue * value, GParamSpec * pspec) |
| { |
| GstDtlsSrtpEnc *self = GST_DTLS_SRTP_ENC (object); |
| |
| switch (prop_id) { |
| case PROP_IS_CLIENT: |
| if (self->bin.dtls_element) { |
| g_object_get_property (G_OBJECT (self->bin.dtls_element), "is-client", |
| value); |
| } else { |
| GST_WARNING_OBJECT (self, |
| "tried to get is-client after disabling DTLS"); |
| } |
| break; |
| default: |
| G_OBJECT_WARN_INVALID_PROPERTY_ID (self, prop_id, pspec); |
| } |
| } |
| |
| static GstPad * |
| add_ghost_pad (GstElement * element, |
| const gchar * name, GstPad * target, GstPadTemplate * templ) |
| { |
| GstPad *pad; |
| gboolean ret; |
| |
| pad = gst_ghost_pad_new_from_template (name, target, templ); |
| gst_object_unref (target); |
| target = NULL; |
| |
| ret = gst_pad_set_active (pad, TRUE); |
| g_warn_if_fail (ret); |
| |
| ret = gst_element_add_pad (element, pad); |
| g_warn_if_fail (ret); |
| |
| return pad; |
| } |
| |
| static GstPad * |
| gst_dtls_srtp_enc_request_new_pad (GstElement * element, |
| GstPadTemplate * templ, const gchar * name, const GstCaps * caps) |
| { |
| GstDtlsSrtpEnc *self = GST_DTLS_SRTP_ENC (element); |
| GstElementClass *klass = GST_ELEMENT_GET_CLASS (element); |
| GstPad *target_pad; |
| GstPad *ghost_pad = NULL; |
| guint pad_n; |
| gchar *srtp_src_name; |
| |
| GST_DEBUG_OBJECT (element, "pad requested"); |
| |
| g_return_val_if_fail (templ->direction == GST_PAD_SINK, NULL); |
| g_return_val_if_fail (self->srtp_enc, NULL); |
| |
| if (templ == gst_element_class_get_pad_template (klass, "rtp_sink_%d")) { |
| target_pad = gst_element_get_request_pad (self->srtp_enc, name); |
| g_return_val_if_fail (target_pad, NULL); |
| |
| sscanf (GST_PAD_NAME (target_pad), "rtp_sink_%d", &pad_n); |
| srtp_src_name = g_strdup_printf ("rtp_src_%d", pad_n); |
| |
| gst_element_link_pads (self->srtp_enc, srtp_src_name, self->funnel, NULL); |
| |
| g_free (srtp_src_name); |
| |
| ghost_pad = add_ghost_pad (element, name, target_pad, templ); |
| |
| GST_LOG_OBJECT (self, "added rtp sink pad"); |
| } else if (templ == gst_element_class_get_pad_template (klass, |
| "rtcp_sink_%d")) { |
| target_pad = gst_element_get_request_pad (self->srtp_enc, name); |
| g_return_val_if_fail (target_pad, NULL); |
| |
| sscanf (GST_PAD_NAME (target_pad), "rtcp_sink_%d", &pad_n); |
| srtp_src_name = g_strdup_printf ("rtcp_src_%d", pad_n); |
| |
| gst_element_link_pads (self->srtp_enc, srtp_src_name, self->funnel, NULL); |
| |
| g_free (srtp_src_name); |
| |
| ghost_pad = add_ghost_pad (element, name, target_pad, templ); |
| |
| GST_LOG_OBJECT (self, "added rtcp sink pad"); |
| } else if (templ == gst_element_class_get_pad_template (klass, "data_sink")) { |
| g_return_val_if_fail (self->bin.dtls_element, NULL); |
| target_pad = gst_element_get_request_pad (self->bin.dtls_element, "sink"); |
| |
| ghost_pad = add_ghost_pad (element, name, target_pad, templ); |
| |
| GST_LOG_OBJECT (self, "added data sink pad"); |
| } else { |
| g_warn_if_reached (); |
| } |
| |
| if (caps && ghost_pad) { |
| g_object_set (ghost_pad, "caps", caps, NULL); |
| } |
| |
| return ghost_pad; |
| } |
| |
| static void |
| on_key_received (GObject * encoder, GstDtlsSrtpEnc * self) |
| { |
| GstDtlsSrtpBin *bin = GST_DTLS_SRTP_BIN (self); |
| GstBuffer *buffer = NULL; |
| guint cipher, auth; |
| |
| if (!(bin->key_is_set || bin->srtp_cipher || bin->srtp_auth |
| || bin->srtcp_cipher || bin->srtcp_auth)) { |
| g_object_get (encoder, |
| "encoder-key", &buffer, |
| "srtp-cipher", &cipher, "srtp-auth", &auth, NULL); |
| |
| g_object_set (self->srtp_enc, |
| "rtp-cipher", cipher, |
| "rtcp-cipher", cipher, |
| "rtp-auth", auth, |
| "rtcp-auth", auth, "key", buffer, "random-key", FALSE, NULL); |
| |
| g_signal_emit (self, signals[SIGNAL_ON_KEY_SET], 0); |
| } else { |
| GST_DEBUG_OBJECT (self, |
| "ignoring keys received from DTLS handshake, key struct is set"); |
| } |
| } |
| |
| static void |
| gst_dtls_srtp_enc_remove_dtls_element (GstDtlsSrtpBin * bin) |
| { |
| GstDtlsSrtpEnc *self = GST_DTLS_SRTP_ENC (bin); |
| GstPad *dtls_sink_pad, *peer_pad; |
| gulong id; |
| guint rtp_cipher = 1, rtcp_cipher = 1, rtp_auth = 1, rtcp_auth = 1; |
| |
| if (!bin->dtls_element) { |
| return; |
| } |
| |
| g_object_get (self->srtp_enc, |
| "rtp-cipher", &rtp_cipher, |
| "rtcp-cipher", &rtcp_cipher, |
| "rtp-auth", &rtp_auth, "rtcp-auth", &rtcp_auth, NULL); |
| |
| if (!rtp_cipher && !rtcp_cipher && !rtp_auth && !rtcp_auth) { |
| g_object_set (self->srtp_enc, "random-key", FALSE, NULL); |
| } |
| |
| dtls_sink_pad = gst_element_get_static_pad (bin->dtls_element, "sink"); |
| |
| if (!dtls_sink_pad) { |
| gst_element_set_state (GST_ELEMENT (bin->dtls_element), GST_STATE_NULL); |
| gst_bin_remove (GST_BIN (self), bin->dtls_element); |
| bin->dtls_element = NULL; |
| return; |
| } |
| |
| peer_pad = gst_pad_get_peer (dtls_sink_pad); |
| g_return_if_fail (peer_pad); |
| gst_object_unref (dtls_sink_pad); |
| dtls_sink_pad = NULL; |
| |
| id = gst_pad_add_probe (peer_pad, GST_PAD_PROBE_TYPE_BLOCK_DOWNSTREAM, |
| (GstPadProbeCallback) remove_dtls_encoder_probe_callback, |
| bin->dtls_element, NULL); |
| g_return_if_fail (id); |
| bin->dtls_element = NULL; |
| |
| gst_pad_push_event (peer_pad, |
| gst_event_new_custom (GST_EVENT_CUSTOM_DOWNSTREAM, |
| gst_structure_new_empty ("dummy"))); |
| |
| gst_object_unref (peer_pad); |
| } |
| |
| static GstPadProbeReturn |
| remove_dtls_encoder_probe_callback (GstPad * pad, |
| GstPadProbeInfo * info, GstElement * element) |
| { |
| gst_pad_remove_probe (pad, GST_PAD_PROBE_INFO_ID (info)); |
| |
| gst_element_set_state (GST_ELEMENT (element), GST_STATE_NULL); |
| gst_bin_remove (GST_BIN (GST_ELEMENT_PARENT (element)), element); |
| |
| return GST_PAD_PROBE_OK; |
| } |