gstreamer/ext/dtls/gstdtlsenc.c

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/*
* 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 "gstdtlselements.h"
#include "gstdtlsenc.h"
#include "gstdtlsdec.h"
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static GstStaticPadTemplate sink_template = GST_STATIC_PAD_TEMPLATE ("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 ("application/x-dtls")
);
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GST_DEBUG_CATEGORY_STATIC (gst_dtls_enc_debug);
#define GST_CAT_DEFAULT gst_dtls_enc_debug
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#define gst_dtls_enc_parent_class parent_class
G_DEFINE_TYPE_WITH_CODE (GstDtlsEnc, gst_dtls_enc, GST_TYPE_ELEMENT,
GST_DEBUG_CATEGORY_INIT (gst_dtls_enc_debug, "dtlsenc", 0, "DTLS Encoder"));
GST_ELEMENT_REGISTER_DEFINE_WITH_CODE (dtlsenc, "dtlsenc", GST_RANK_NONE,
GST_TYPE_DTLS_ENC, dtls_element_init (plugin));
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enum
{
SIGNAL_ON_KEY_RECEIVED,
NUM_SIGNALS
};
static guint signals[NUM_SIGNALS];
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enum
{
PROP_0,
PROP_CONNECTION_ID,
PROP_IS_CLIENT,
PROP_ENCODER_KEY,
PROP_SRTP_CIPHER,
PROP_SRTP_AUTH,
PROP_CONNECTION_STATE,
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NUM_PROPERTIES
};
static GParamSpec *properties[NUM_PROPERTIES];
#define DEFAULT_CONNECTION_ID NULL
#define DEFAULT_IS_CLIENT FALSE
#define DEFAULT_ENCODER_KEY NULL
#define DEFAULT_SRTP_CIPHER 0
#define DEFAULT_SRTP_AUTH 0
#define INITIAL_QUEUE_SIZE 64
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static void gst_dtls_enc_finalize (GObject *);
static void gst_dtls_enc_set_property (GObject *, guint prop_id,
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const GValue *, GParamSpec *);
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static void gst_dtls_enc_get_property (GObject *, guint prop_id, GValue *,
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GParamSpec *);
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static GstStateChangeReturn gst_dtls_enc_change_state (GstElement *,
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GstStateChange);
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static GstPad *gst_dtls_enc_request_new_pad (GstElement *, GstPadTemplate *,
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const gchar * name, const GstCaps *);
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static gboolean src_activate_mode (GstPad *, GstObject *, GstPadMode,
gboolean active);
static void src_task_loop (GstPad *);
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static GstFlowReturn sink_chain (GstPad *, GstObject *, GstBuffer *);
static gboolean sink_event (GstPad * pad, GstObject * parent, GstEvent * event);
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static void on_key_received (GstDtlsConnection *, gpointer key, guint cipher,
guint auth, GstDtlsEnc *);
static gboolean on_send_data (GstDtlsConnection *, gconstpointer data,
gsize length, GstDtlsEnc *);
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static void
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gst_dtls_enc_class_init (GstDtlsEncClass * klass)
{
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GObjectClass *gobject_class;
GstElementClass *element_class;
gobject_class = (GObjectClass *) klass;
element_class = (GstElementClass *) klass;
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gobject_class->finalize = GST_DEBUG_FUNCPTR (gst_dtls_enc_finalize);
gobject_class->set_property = GST_DEBUG_FUNCPTR (gst_dtls_enc_set_property);
gobject_class->get_property = GST_DEBUG_FUNCPTR (gst_dtls_enc_get_property);
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element_class->change_state = GST_DEBUG_FUNCPTR (gst_dtls_enc_change_state);
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element_class->request_new_pad =
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GST_DEBUG_FUNCPTR (gst_dtls_enc_request_new_pad);
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signals[SIGNAL_ON_KEY_RECEIVED] =
g_signal_new ("on-key-received", G_TYPE_FROM_CLASS (klass),
G_SIGNAL_RUN_LAST, 0, NULL, NULL, NULL, G_TYPE_NONE, 0);
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properties[PROP_CONNECTION_ID] =
g_param_spec_string ("connection-id",
"Connection id",
"Every encoder/decoder pair should have the same, unique, connection-id",
DEFAULT_CONNECTION_ID, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS);
properties[PROP_IS_CLIENT] =
g_param_spec_boolean ("is-client",
"Is client",
"Set to true if the decoder should act as "
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"client and initiate the handshake",
DEFAULT_IS_CLIENT,
GST_PARAM_MUTABLE_READY | G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS);
properties[PROP_ENCODER_KEY] =
g_param_spec_boxed ("encoder-key",
"Encoder key",
"Master key that should be used by the SRTP encoder",
GST_TYPE_BUFFER, G_PARAM_READABLE | G_PARAM_STATIC_STRINGS);
properties[PROP_SRTP_CIPHER] =
g_param_spec_uint ("srtp-cipher",
"SRTP cipher",
"The SRTP cipher selected in the DTLS handshake. "
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"The value will be set to an GstDtlsSrtpCipher.",
0, GST_DTLS_SRTP_CIPHER_AES_128_ICM, DEFAULT_SRTP_CIPHER,
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G_PARAM_READABLE | G_PARAM_STATIC_STRINGS);
properties[PROP_SRTP_AUTH] =
g_param_spec_uint ("srtp-auth",
"SRTP authentication",
"The SRTP authentication selected in the DTLS handshake. "
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"The value will be set to an GstDtlsSrtpAuth.",
0, GST_DTLS_SRTP_AUTH_HMAC_SHA1_80, DEFAULT_SRTP_AUTH,
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G_PARAM_READABLE | G_PARAM_STATIC_STRINGS);
properties[PROP_CONNECTION_STATE] =
g_param_spec_enum ("connection-state",
"Connection State",
"Current connection state",
GST_DTLS_TYPE_CONNECTION_STATE,
GST_DTLS_CONNECTION_STATE_NEW, G_PARAM_READABLE | G_PARAM_STATIC_STRINGS);
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g_object_class_install_properties (gobject_class, NUM_PROPERTIES, properties);
gst_element_class_add_static_pad_template (element_class, &src_template);
gst_element_class_add_static_pad_template (element_class, &sink_template);
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gst_element_class_set_static_metadata (element_class,
"DTLS Encoder",
"Encoder/Network/DTLS",
"Encodes packets with DTLS",
"Patrik Oldsberg patrik.oldsberg@ericsson.com");
}
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static void
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gst_dtls_enc_init (GstDtlsEnc * self)
{
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self->connection_id = NULL;
self->connection = NULL;
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self->is_client = DEFAULT_IS_CLIENT;
self->encoder_key = NULL;
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self->srtp_cipher = DEFAULT_SRTP_CIPHER;
self->srtp_auth = DEFAULT_SRTP_AUTH;
g_queue_init (&self->queue);
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g_mutex_init (&self->queue_lock);
g_cond_init (&self->queue_cond_add);
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self->src = gst_pad_new_from_static_template (&src_template, "src");
g_return_if_fail (self->src);
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gst_pad_set_activatemode_function (self->src,
GST_DEBUG_FUNCPTR (src_activate_mode));
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gst_element_add_pad (GST_ELEMENT (self), self->src);
}
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static void
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gst_dtls_enc_finalize (GObject * object)
{
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GstDtlsEnc *self = GST_DTLS_ENC (object);
if (self->encoder_key) {
gst_buffer_unref (self->encoder_key);
self->encoder_key = NULL;
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}
if (self->connection_id) {
g_free (self->connection_id);
self->connection_id = NULL;
}
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g_mutex_lock (&self->queue_lock);
g_queue_foreach (&self->queue, (GFunc) gst_buffer_unref, NULL);
g_queue_clear (&self->queue);
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g_mutex_unlock (&self->queue_lock);
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g_mutex_clear (&self->queue_lock);
g_cond_clear (&self->queue_cond_add);
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GST_LOG_OBJECT (self, "finalized");
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G_OBJECT_CLASS (parent_class)->finalize (object);
}
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static void
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gst_dtls_enc_set_property (GObject * object, guint prop_id,
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const GValue * value, GParamSpec * pspec)
{
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GstDtlsEnc *self = GST_DTLS_ENC (object);
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switch (prop_id) {
case PROP_CONNECTION_ID:
if (self->connection_id != NULL) {
g_free (self->connection_id);
self->connection_id = NULL;
}
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self->connection_id = g_value_dup_string (value);
break;
case PROP_IS_CLIENT:
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self->is_client = g_value_get_boolean (value);
break;
default:
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G_OBJECT_WARN_INVALID_PROPERTY_ID (self, prop_id, pspec);
}
}
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static void
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gst_dtls_enc_get_property (GObject * object, guint prop_id, GValue * value,
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GParamSpec * pspec)
{
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GstDtlsEnc *self = GST_DTLS_ENC (object);
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switch (prop_id) {
case PROP_CONNECTION_ID:
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g_value_set_string (value, self->connection_id);
break;
case PROP_IS_CLIENT:
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g_value_set_boolean (value, self->is_client);
break;
case PROP_ENCODER_KEY:
g_value_set_boxed (value, self->encoder_key);
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break;
case PROP_SRTP_CIPHER:
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g_value_set_uint (value, self->srtp_cipher);
break;
case PROP_SRTP_AUTH:
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g_value_set_uint (value, self->srtp_auth);
break;
case PROP_CONNECTION_STATE:
if (self->connection)
g_object_get_property (G_OBJECT (self->connection), "connection-state",
value);
else
g_value_set_enum (value, GST_DTLS_CONNECTION_STATE_CLOSED);
break;
default:
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G_OBJECT_WARN_INVALID_PROPERTY_ID (self, prop_id, pspec);
}
}
static void
on_connection_state_changed (GObject * object, GParamSpec * pspec,
gpointer user_data)
{
GstDtlsEnc *self = GST_DTLS_ENC (user_data);
g_object_notify_by_pspec (G_OBJECT (self), properties[PROP_CONNECTION_STATE]);
}
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static GstStateChangeReturn
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gst_dtls_enc_change_state (GstElement * element, GstStateChange transition)
{
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GstDtlsEnc *self = GST_DTLS_ENC (element);
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GstStateChangeReturn ret;
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switch (transition) {
case GST_STATE_CHANGE_NULL_TO_READY:
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if (self->connection_id) {
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self->connection = gst_dtls_dec_fetch_connection (self->connection_id);
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if (!self->connection) {
GST_WARNING_OBJECT (self,
"invalid connection id: '%s', connection not found or already in use",
self->connection_id);
return GST_STATE_CHANGE_FAILURE;
}
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g_signal_connect_object (self->connection,
"on-encoder-key", G_CALLBACK (on_key_received), self, 0);
g_signal_connect_object (self->connection,
"notify::connection-state",
G_CALLBACK (on_connection_state_changed), self, 0);
on_connection_state_changed (NULL, NULL, self);
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gst_dtls_connection_set_send_callback (self->connection,
(GstDtlsConnectionSendCallback) on_send_data, self, NULL);
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} else {
GST_WARNING_OBJECT (self,
"trying to change state to ready without connection id");
return GST_STATE_CHANGE_FAILURE;
}
break;
case GST_STATE_CHANGE_PAUSED_TO_READY:
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GST_DEBUG_OBJECT (self, "stopping connection %s", self->connection_id);
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gst_dtls_connection_stop (self->connection);
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break;
case GST_STATE_CHANGE_READY_TO_NULL:
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GST_DEBUG_OBJECT (self, "closing connection %s", self->connection_id);
if (self->connection) {
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gst_dtls_connection_close (self->connection);
gst_dtls_connection_set_send_callback (self->connection, NULL, NULL,
NULL);
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g_object_unref (self->connection);
self->connection = NULL;
}
break;
default:
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break;
}
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ret = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
switch (transition) {
case GST_STATE_CHANGE_READY_TO_PAUSED:{
GError *err = NULL;
GST_DEBUG_OBJECT (self, "starting connection %s", self->connection_id);
if (!gst_dtls_connection_start (self->connection, self->is_client, &err)) {
GST_ELEMENT_ERROR (self, RESOURCE, OPEN_WRITE, (NULL), ("%s",
err->message));
g_clear_error (&err);
}
break;
}
default:
break;
}
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return ret;
}
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static GstPad *
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gst_dtls_enc_request_new_pad (GstElement * element,
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GstPadTemplate * templ, const gchar * name, const GstCaps * caps)
{
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GstPad *sink;
gboolean ret;
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GST_DEBUG_OBJECT (element, "sink pad requested");
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g_return_val_if_fail (templ->direction == GST_PAD_SINK, NULL);
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sink = gst_pad_new_from_template (templ, name);
g_return_val_if_fail (sink, NULL);
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if (caps) {
g_object_set (sink, "caps", caps, NULL);
}
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gst_pad_set_chain_function (sink, GST_DEBUG_FUNCPTR (sink_chain));
gst_pad_set_event_function (sink, GST_DEBUG_FUNCPTR (sink_event));
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ret = gst_pad_set_active (sink, TRUE);
g_warn_if_fail (ret);
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gst_element_add_pad (element, sink);
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return sink;
}
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static gboolean
src_activate_mode (GstPad * pad, GstObject * parent, GstPadMode mode,
gboolean active)
{
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GstDtlsEnc *self = GST_DTLS_ENC (parent);
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gboolean success = TRUE;
g_return_val_if_fail (mode == GST_PAD_MODE_PUSH, FALSE);
if (active) {
GST_DEBUG_OBJECT (self, "src pad activating in push mode");
self->flushing = FALSE;
self->src_ret = GST_FLOW_OK;
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self->send_initial_events = TRUE;
success =
gst_pad_start_task (pad, (GstTaskFunction) src_task_loop, self->src,
NULL);
if (!success) {
GST_WARNING_OBJECT (self, "failed to activate pad task");
}
} else {
GST_DEBUG_OBJECT (self, "deactivating src pad");
g_mutex_lock (&self->queue_lock);
g_queue_foreach (&self->queue, (GFunc) gst_buffer_unref, NULL);
g_queue_clear (&self->queue);
self->flushing = TRUE;
self->src_ret = GST_FLOW_FLUSHING;
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g_cond_signal (&self->queue_cond_add);
g_mutex_unlock (&self->queue_lock);
success = gst_pad_stop_task (pad);
if (!success) {
GST_WARNING_OBJECT (self, "failed to deactivate pad task");
}
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}
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return success;
}
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static void
src_task_loop (GstPad * pad)
{
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GstDtlsEnc *self = GST_DTLS_ENC (GST_PAD_PARENT (pad));
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GstFlowReturn ret;
GstBuffer *buffer;
gboolean check_connection_timeout = FALSE;
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GST_TRACE_OBJECT (self, "src loop: acquiring lock");
g_mutex_lock (&self->queue_lock);
GST_TRACE_OBJECT (self, "src loop: acquired lock");
if (self->flushing) {
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GST_LOG_OBJECT (self, "src task loop entered on inactive pad");
GST_TRACE_OBJECT (self, "src loop: releasing lock");
g_mutex_unlock (&self->queue_lock);
return;
}
while (g_queue_is_empty (&self->queue)) {
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GST_TRACE_OBJECT (self, "src loop: queue empty, waiting for add");
g_cond_wait (&self->queue_cond_add, &self->queue_lock);
GST_TRACE_OBJECT (self, "src loop: add signaled");
if (self->flushing) {
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GST_LOG_OBJECT (self, "pad inactive, task returning");
GST_TRACE_OBJECT (self, "src loop: releasing lock");
g_mutex_unlock (&self->queue_lock);
return;
}
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}
GST_TRACE_OBJECT (self, "src loop: queue has element");
buffer = g_queue_pop_head (&self->queue);
g_mutex_unlock (&self->queue_lock);
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if (self->send_initial_events) {
GstSegment segment;
gchar s_id[32];
GstCaps *caps;
self->send_initial_events = FALSE;
g_snprintf (s_id, sizeof (s_id), "dtlsenc-%08x", g_random_int ());
gst_pad_push_event (self->src, gst_event_new_stream_start (s_id));
caps = gst_caps_new_empty_simple ("application/x-dtls");
gst_pad_push_event (self->src, gst_event_new_caps (caps));
gst_caps_unref (caps);
gst_segment_init (&segment, GST_FORMAT_BYTES);
gst_pad_push_event (self->src, gst_event_new_segment (&segment));
check_connection_timeout = TRUE;
}
GST_TRACE_OBJECT (self, "src loop: releasing lock");
if (buffer) {
ret = gst_pad_push (self->src, buffer);
if (check_connection_timeout)
gst_dtls_connection_check_timeout (self->connection);
if (G_UNLIKELY (ret == GST_FLOW_NOT_LINKED || ret < GST_FLOW_EOS)) {
GST_WARNING_OBJECT (self, "failed to push buffer on src pad: %s",
gst_flow_get_name (ret));
}
g_mutex_lock (&self->queue_lock);
self->src_ret = ret;
g_mutex_unlock (&self->queue_lock);
} else {
GST_DEBUG_OBJECT (self, "Peer and us closed the connection, sending EOS");
gst_pad_push_event (self->src, gst_event_new_eos ());
g_mutex_lock (&self->queue_lock);
self->src_ret = GST_FLOW_EOS;
g_mutex_unlock (&self->queue_lock);
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}
}
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static GstFlowReturn
sink_chain (GstPad * pad, GstObject * parent, GstBuffer * buffer)
{
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GstDtlsEnc *self = GST_DTLS_ENC (parent);
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GstMapInfo map_info;
GError *err = NULL;
gsize to_write, written = 0;
GstFlowReturn ret = GST_FLOW_OK;
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g_mutex_lock (&self->queue_lock);
if (self->src_ret != GST_FLOW_OK) {
if (G_UNLIKELY (self->src_ret == GST_FLOW_NOT_LINKED
|| self->src_ret < GST_FLOW_EOS))
GST_ERROR_OBJECT (self, "Pushing previous data returned an error: %s",
gst_flow_get_name (self->src_ret));
gst_buffer_unref (buffer);
g_mutex_unlock (&self->queue_lock);
return self->src_ret;
}
g_mutex_unlock (&self->queue_lock);
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gst_buffer_map (buffer, &map_info, GST_MAP_READ);
to_write = map_info.size;
while (to_write > 0 && ret == GST_FLOW_OK) {
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ret =
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gst_dtls_connection_send (self->connection, map_info.data,
map_info.size, &written, &err);
switch (ret) {
case GST_FLOW_OK:
GST_DEBUG_OBJECT (self,
"Wrote %" G_GSIZE_FORMAT " B of %" G_GSIZE_FORMAT " B", written,
map_info.size);
g_assert (written <= to_write);
to_write -= written;
break;
case GST_FLOW_EOS:
GST_INFO_OBJECT (self, "Received data after the connection was closed");
break;
case GST_FLOW_ERROR:
GST_WARNING_OBJECT (self, "error sending data: %s", err->message);
GST_ELEMENT_ERROR (self, RESOURCE, WRITE, (NULL), ("%s", err->message));
g_clear_error (&err);
break;
case GST_FLOW_FLUSHING:
GST_INFO_OBJECT (self, "Flushing");
break;
default:
g_assert_not_reached ();
break;
}
g_assert (err == NULL);
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}
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gst_buffer_unmap (buffer, &map_info);
gst_buffer_unref (buffer);
return ret;
}
static gboolean
sink_event (GstPad * pad, GstObject * parent, GstEvent * event)
{
GstDtlsEnc *self = GST_DTLS_ENC (parent);
gboolean ret = FALSE;
switch (GST_EVENT_TYPE (event)) {
/* Drop segment, stream-start as we will push our own from the src pad
* task.
* FIXME: do we need any information from upstream for pushing our own? */
case GST_EVENT_SEGMENT:
case GST_EVENT_STREAM_START:
gst_event_unref (event);
ret = TRUE;
break;
case GST_EVENT_EOS:{
GstFlowReturn flow_ret;
/* Close the write side of the connection now */
flow_ret =
gst_dtls_connection_send (self->connection, NULL, 0, NULL, NULL);
if (flow_ret != GST_FLOW_OK)
GST_ERROR_OBJECT (self, "Failed to send close_notify");
/* Do not forward the EOS event unless the peer already closed to the
* connection itself. If it didn't yet then we'll later get the send
* callback called with no data and send EOS from there */
if (flow_ret == GST_FLOW_EOS) {
ret = gst_pad_event_default (pad, parent, event);
} else {
gst_event_unref (event);
ret = TRUE;
}
break;
}
default:
ret = gst_pad_event_default (pad, parent, event);
break;
}
return ret;
}
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static void
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on_key_received (GstDtlsConnection * connection, gpointer key, guint cipher,
guint auth, GstDtlsEnc * self)
{
GstBuffer *new_encoder_key;
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gchar *key_str;
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g_return_if_fail (GST_IS_DTLS_ENC (self));
g_return_if_fail (GST_IS_DTLS_CONNECTION (connection));
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self->srtp_cipher = cipher;
self->srtp_auth = auth;
new_encoder_key =
gst_buffer_new_memdup (key, GST_DTLS_SRTP_MASTER_KEY_LENGTH);
if (self->encoder_key)
gst_buffer_unref (self->encoder_key);
self->encoder_key = new_encoder_key;
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key_str = g_base64_encode (key, GST_DTLS_SRTP_MASTER_KEY_LENGTH);
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GST_INFO_OBJECT (self, "received key: %s", key_str);
g_free (key_str);
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g_signal_emit (self, signals[SIGNAL_ON_KEY_RECEIVED], 0);
}
static gboolean
on_send_data (GstDtlsConnection * connection, gconstpointer data, gsize length,
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GstDtlsEnc * self)
{
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GstBuffer *buffer;
gboolean ret;
GST_DEBUG_OBJECT (self, "sending data from %s with length %" G_GSIZE_FORMAT,
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self->connection_id, length);
buffer = data ? gst_buffer_new_memdup (data, length) : NULL;
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GST_TRACE_OBJECT (self, "send data: acquiring lock");
g_mutex_lock (&self->queue_lock);
GST_TRACE_OBJECT (self, "send data: acquired lock");
g_queue_push_tail (&self->queue, buffer);
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GST_TRACE_OBJECT (self, "send data: signaling add");
g_cond_signal (&self->queue_cond_add);
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GST_TRACE_OBJECT (self, "send data: releasing lock");
ret = self->src_ret == GST_FLOW_OK;
if (self->src_ret == GST_FLOW_FLUSHING)
gst_dtls_connection_set_flow_return (connection, self->src_ret);
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g_mutex_unlock (&self->queue_lock);
return ret;
}