static gboolean
socket_is_reliable (NiceSocket *sock)
{
PseudoSSLPriv *priv = sock->priv;
return nice_socket_is_reliable (priv->base_socket);
}
static gboolean
nice_output_stream_is_writable (GPollableOutputStream *stream)
{
NiceOutputStreamPrivate *priv = NICE_OUTPUT_STREAM (stream)->priv;
NiceComponent *component = NULL;
NiceStream *_stream = NULL;
gboolean retval = FALSE;
NiceAgent *agent; /* owned */
/* Closed streams are not writeable. */
if (g_output_stream_is_closed (G_OUTPUT_STREAM (stream)))
return FALSE;
/* Has the agent disappeared? */
agent = g_weak_ref_get (&priv->agent_ref);
if (agent == NULL)
return FALSE;
agent_lock ();
if (!agent_find_component (agent, priv->stream_id, priv->component_id,
&_stream, &component)) {
g_warning ("Could not find component %u in stream %u", priv->component_id,
priv->stream_id);
goto done;
}
if (component->selected_pair.local != NULL) {
NiceSocket *sockptr = component->selected_pair.local->sockptr;
/* If it’s a reliable agent, see if there’s any space in the pseudo-TCP
* output buffer. */
if (!nice_socket_is_reliable (sockptr)) {
retval = pseudo_tcp_socket_can_send (component->tcp);
} else {
retval = (g_socket_condition_check (sockptr->fileno, G_IO_OUT) != 0);
}
}
done:
agent_unlock ();
g_object_unref (agent);
return retval;
}
/*
* Frees the CandidateDiscovery structure pointed to
* by 'user data'. Compatible with g_slist_free_full().
*/
static void refresh_free_item (CandidateRefresh *cand)
{
NiceAgent *agent = cand->agent;
uint8_t *username;
gsize username_len;
uint8_t *password;
gsize password_len;
size_t buffer_len = 0;
StunUsageTurnCompatibility turn_compat = agent_to_turn_compatibility (agent);
if (cand->timer_source != NULL) {
g_source_destroy (cand->timer_source);
g_source_unref (cand->timer_source);
cand->timer_source = NULL;
}
if (cand->tick_source != NULL) {
g_source_destroy (cand->tick_source);
g_source_unref (cand->tick_source);
cand->tick_source = NULL;
}
username = (uint8_t *)cand->candidate->turn->username;
username_len = (size_t) strlen (cand->candidate->turn->username);
password = (uint8_t *)cand->candidate->turn->password;
password_len = (size_t) strlen (cand->candidate->turn->password);
if (turn_compat == STUN_USAGE_TURN_COMPATIBILITY_MSN ||
turn_compat == STUN_USAGE_TURN_COMPATIBILITY_OC2007) {
username = g_base64_decode ((gchar *)username, &username_len);
password = g_base64_decode ((gchar *)password, &password_len);
}
buffer_len = stun_usage_turn_create_refresh (&cand->stun_agent,
&cand->stun_message, cand->stun_buffer, sizeof(cand->stun_buffer),
cand->stun_resp_msg.buffer == NULL ? NULL : &cand->stun_resp_msg, 0,
username, username_len,
password, password_len,
agent_to_turn_compatibility (agent));
if (buffer_len > 0) {
StunTransactionId id;
/* forget the transaction since we don't care about the result and
* we don't implement retransmissions/timeout */
stun_message_id (&cand->stun_message, id);
stun_agent_forget_transaction (&cand->stun_agent, id);
/* send the refresh twice since we won't do retransmissions */
agent_socket_send (cand->nicesock, &cand->server,
buffer_len, (gchar *)cand->stun_buffer);
if (!nice_socket_is_reliable (cand->nicesock)) {
agent_socket_send (cand->nicesock, &cand->server,
buffer_len, (gchar *)cand->stun_buffer);
}
}
if (turn_compat == STUN_USAGE_TURN_COMPATIBILITY_MSN ||
turn_compat == STUN_USAGE_TURN_COMPATIBILITY_OC2007) {
g_free (username);
g_free (password);
}
g_slice_free (CandidateRefresh, cand);
}
/*
* Timer callback that handles scheduling new candidate discovery
* processes (paced by the Ta timer), and handles running of the
* existing discovery processes.
*
* This function is designed for the g_timeout_add() interface.
*
* @return will return FALSE when no more pending timers.
*/
static gboolean priv_discovery_tick_unlocked (gpointer pointer)
{
CandidateDiscovery *cand;
NiceAgent *agent = pointer;
GSList *i;
int not_done = 0; /* note: track whether to continue timer */
size_t buffer_len = 0;
{
static int tick_counter = 0;
if (tick_counter++ % 50 == 0)
nice_debug ("Agent %p : discovery tick #%d with list %p (1)", agent, tick_counter, agent->discovery_list);
}
for (i = agent->discovery_list; i ; i = i->next) {
cand = i->data;
if (cand->pending != TRUE) {
cand->pending = TRUE;
if (agent->discovery_unsched_items)
--agent->discovery_unsched_items;
if (nice_debug_is_enabled ()) {
gchar tmpbuf[INET6_ADDRSTRLEN];
nice_address_to_string (&cand->server, tmpbuf);
nice_debug ("Agent %p : discovery - scheduling cand type %u addr %s.",
agent, cand->type, tmpbuf);
}
if (nice_address_is_valid (&cand->server) &&
(cand->type == NICE_CANDIDATE_TYPE_SERVER_REFLEXIVE ||
cand->type == NICE_CANDIDATE_TYPE_RELAYED)) {
if (cand->component->state == NICE_COMPONENT_STATE_DISCONNECTED ||
cand->component->state == NICE_COMPONENT_STATE_FAILED)
agent_signal_component_state_change (agent,
cand->stream->id,
cand->component->id,
NICE_COMPONENT_STATE_GATHERING);
if (cand->type == NICE_CANDIDATE_TYPE_SERVER_REFLEXIVE) {
buffer_len = stun_usage_bind_create (&cand->stun_agent,
&cand->stun_message, cand->stun_buffer, sizeof(cand->stun_buffer));
} else if (cand->type == NICE_CANDIDATE_TYPE_RELAYED) {
uint8_t *username = (uint8_t *)cand->turn->username;
gsize username_len = strlen (cand->turn->username);
uint8_t *password = (uint8_t *)cand->turn->password;
gsize password_len = strlen (cand->turn->password);
StunUsageTurnCompatibility turn_compat =
agent_to_turn_compatibility (agent);
if (turn_compat == STUN_USAGE_TURN_COMPATIBILITY_MSN ||
turn_compat == STUN_USAGE_TURN_COMPATIBILITY_OC2007) {
username = g_base64_decode ((gchar *)username, &username_len);
password = g_base64_decode ((gchar *)password, &password_len);
}
buffer_len = stun_usage_turn_create (&cand->stun_agent,
&cand->stun_message, cand->stun_buffer, sizeof(cand->stun_buffer),
cand->stun_resp_msg.buffer == NULL ? NULL : &cand->stun_resp_msg,
STUN_USAGE_TURN_REQUEST_PORT_NORMAL,
-1, -1,
username, username_len,
password, password_len,
turn_compat);
if (turn_compat == STUN_USAGE_TURN_COMPATIBILITY_MSN ||
turn_compat == STUN_USAGE_TURN_COMPATIBILITY_OC2007) {
g_free (username);
g_free (password);
}
}
if (buffer_len > 0) {
if (nice_socket_is_reliable (cand->nicesock)) {
stun_timer_start_reliable (&cand->timer, agent->stun_reliable_timeout);
} else {
stun_timer_start (&cand->timer,
agent->stun_initial_timeout,
agent->stun_max_retransmissions);
}
/* send the conncheck */
agent_socket_send (cand->nicesock, &cand->server,
buffer_len, (gchar *)cand->stun_buffer);
/* case: success, start waiting for the result */
g_get_current_time (&cand->next_tick);
} else {
/* case: error in starting discovery, start the next discovery */
cand->done = TRUE;
cand->stun_message.buffer = NULL;
cand->stun_message.buffer_len = 0;
continue;
}
}
else
/* allocate relayed candidates */
g_assert_not_reached ();
++not_done; /* note: new discovery scheduled */
}
if (cand->done != TRUE) {
GTimeVal now;
g_get_current_time (&now);
if (cand->stun_message.buffer == NULL) {
nice_debug ("Agent %p : STUN discovery was cancelled, marking discovery done.", agent);
cand->done = TRUE;
}
else if (priv_timer_expired (&cand->next_tick, &now)) {
switch (stun_timer_refresh (&cand->timer)) {
case STUN_USAGE_TIMER_RETURN_TIMEOUT:
{
/* Time out */
/* case: error, abort processing */
StunTransactionId id;
stun_message_id (&cand->stun_message, id);
stun_agent_forget_transaction (&cand->stun_agent, id);
cand->done = TRUE;
cand->stun_message.buffer = NULL;
cand->stun_message.buffer_len = 0;
nice_debug ("Agent %p : bind discovery timed out, aborting discovery item.", agent);
break;
}
case STUN_USAGE_TIMER_RETURN_RETRANSMIT:
{
/* case: not ready complete, so schedule next timeout */
unsigned int timeout = stun_timer_remainder (&cand->timer);
stun_debug ("STUN transaction retransmitted (timeout %dms).",
timeout);
/* retransmit */
agent_socket_send (cand->nicesock, &cand->server,
stun_message_length (&cand->stun_message),
(gchar *)cand->stun_buffer);
/* note: convert from milli to microseconds for g_time_val_add() */
cand->next_tick = now;
g_time_val_add (&cand->next_tick, timeout * 1000);
++not_done; /* note: retry later */
break;
}
case STUN_USAGE_TIMER_RETURN_SUCCESS:
{
unsigned int timeout = stun_timer_remainder (&cand->timer);
cand->next_tick = now;
g_time_val_add (&cand->next_tick, timeout * 1000);
++not_done; /* note: retry later */
break;
}
default:
/* Nothing to do. */
break;
}
} else {
++not_done; /* note: discovery not expired yet */
}
}
}
if (not_done == 0) {
nice_debug ("Agent %p : Candidate gathering FINISHED, stopping discovery timer.", agent);
discovery_free (agent);
agent_gathering_done (agent);
/* note: no pending timers, return FALSE to stop timer */
return FALSE;
}
return TRUE;
}