asterisk/main/bridge_channel.c

3138 lines
97 KiB
C

/*
* Asterisk -- An open source telephony toolkit.
*
* Copyright (C) 2007 - 2009, Digium, Inc.
*
* Joshua Colp <jcolp@digium.com>
*
* See http://www.asterisk.org for more information about
* the Asterisk project. Please do not directly contact
* any of the maintainers of this project for assistance;
* the project provides a web site, mailing lists and IRC
* channels for your use.
*
* This program is free software, distributed under the terms of
* the GNU General Public License Version 2. See the LICENSE file
* at the top of the source tree.
*/
/*! \file
*
* \brief Bridging Channel API
*
* \author Joshua Colp <jcolp@digium.com>
* \author Richard Mudgett <rmudgett@digium.com>
* \author Matt Jordan <mjordan@digium.com>
*
*/
/*** MODULEINFO
<support_level>core</support_level>
***/
#include "asterisk.h"
#include <signal.h>
#include "asterisk/heap.h"
#include "asterisk/alertpipe.h"
#include "asterisk/astobj2.h"
#include "asterisk/stringfields.h"
#include "asterisk/app.h"
#include "asterisk/pbx.h"
#include "asterisk/channel.h"
#include "asterisk/timing.h"
#include "asterisk/bridge.h"
#include "asterisk/bridge_channel.h"
#include "asterisk/bridge_after.h"
#include "asterisk/bridge_channel_internal.h"
#include "asterisk/bridge_internal.h"
#include "asterisk/stasis_bridges.h"
#include "asterisk/stasis_channels.h"
#include "asterisk/musiconhold.h"
#include "asterisk/features_config.h"
#include "asterisk/parking.h"
#include "asterisk/causes.h"
#include "asterisk/test.h"
#include "asterisk/sem.h"
#include "asterisk/stream.h"
#include "asterisk/message.h"
#include "asterisk/core_local.h"
/*!
* \brief Used to queue an action frame onto a bridge channel and write an action frame into a bridge.
* \since 12.0.0
*
* \param bridge_channel Which channel work with.
* \param action Type of bridge action frame.
* \param data Frame payload data to pass.
* \param datalen Frame payload data length to pass.
*
* \retval 0 on success.
* \retval -1 on error.
*/
typedef int (*ast_bridge_channel_post_action_data)(struct ast_bridge_channel *bridge_channel, enum bridge_channel_action_type action, const void *data, size_t datalen);
/*!
* \brief Counter used for assigning synchronous bridge action IDs
*/
static int sync_ids;
/*!
* \brief Frame payload for synchronous bridge actions.
*
* The payload serves as a wrapper around the actual payload of the
* frame, with the addition of an id used to find the associated
* bridge_sync object.
*/
struct sync_payload {
/*! Unique ID for this synchronous action */
unsigned int id;
/*! Actual frame data to process */
unsigned char data[0];
};
/*!
* \brief Synchronous bridge action object.
*
* Synchronous bridge actions require the ability for one thread to wait
* and for another thread to indicate that the action has completed. This
* structure facilitates that goal by providing synchronization structures.
*/
struct bridge_sync {
/*! Unique ID of this synchronization object. Corresponds with ID in synchronous frame payload */
unsigned int id;
/*! Semaphore used for synchronization */
struct ast_sem sem;
/*! Pointer to next entry in the list */
AST_LIST_ENTRY(bridge_sync) list;
};
/*!
* \brief List holding active synchronous action objects.
*/
static AST_RWLIST_HEAD_STATIC(sync_structs, bridge_sync);
/*!
* \brief Initialize a synchronous bridge object.
*
* This both initializes the structure and adds it to the list of
* synchronization structures.
*
* \param sync_struct The synchronization object to initialize.
* \param id ID to assign to the synchronization object.
*/
static void bridge_sync_init(struct bridge_sync *sync_struct, unsigned int id)
{
memset(sync_struct, 0, sizeof(*sync_struct));
sync_struct->id = id;
ast_sem_init(&sync_struct->sem, 0, 0);
AST_RWLIST_WRLOCK(&sync_structs);
AST_RWLIST_INSERT_TAIL(&sync_structs, sync_struct, list);
AST_RWLIST_UNLOCK(&sync_structs);
}
/*!
* \brief Clean up a synchronization bridge object.
*
* This frees fields within the synchronization object and removes
* it from the list of active synchronization objects.
*
* Since synchronization objects are stack-allocated, it is vital
* that this is called before the synchronization object goes
* out of scope.
*
* \param sync_struct Synchronization object to clean up.
*/
static void bridge_sync_cleanup(struct bridge_sync *sync_struct)
{
struct bridge_sync *iter;
AST_RWLIST_WRLOCK(&sync_structs);
AST_LIST_TRAVERSE_SAFE_BEGIN(&sync_structs, iter, list) {
if (iter->id == sync_struct->id) {
AST_LIST_REMOVE_CURRENT(list);
break;
}
}
AST_LIST_TRAVERSE_SAFE_END;
AST_RWLIST_UNLOCK(&sync_structs);
ast_sem_destroy(&sync_struct->sem);
}
/*!
* \brief Failsafe for synchronous bridge action waiting.
*
* When waiting for a synchronous bridge action to complete,
* if there is a frame resource leak somewhere, it is possible
* that we will never get notified that the synchronous action
* completed.
*
* If a significant amount of time passes, then we will abandon
* waiting for the synchrnous bridge action to complete.
*
* This constant represents the number of milliseconds we will
* wait for the bridge action to complete.
*/
#define PLAYBACK_TIMEOUT (600 * 1000)
/*!
* \brief Wait for a synchronous bridge action to complete.
*
* \param sync_struct Synchronization object corresponding to the bridge action.
*/
static void bridge_sync_wait(struct bridge_sync *sync_struct)
{
struct timeval timeout_val = ast_tvadd(ast_tvnow(), ast_samp2tv(PLAYBACK_TIMEOUT, 1000));
struct timespec timeout_spec = {
.tv_sec = timeout_val.tv_sec,
.tv_nsec = timeout_val.tv_usec * 1000,
};
ast_sem_timedwait(&sync_struct->sem, &timeout_spec);
}
/*!
* \brief Signal that waiting for a synchronous bridge action is no longer necessary.
*
* This may occur for several reasons
* \li The synchronous bridge action has completed.
* \li The bridge channel has been removed from the bridge.
* \li The synchronous bridge action could not be queued.
*
* \param sync_struct Synchronization object corresponding to the bridge action.
*/
static void bridge_sync_signal(struct bridge_sync *sync_struct)
{
ast_sem_post(&sync_struct->sem);
}
struct ast_channel *ast_bridge_channel_get_chan(struct ast_bridge_channel *bridge_channel)
{
struct ast_channel *chan;
ao2_lock(bridge_channel);
chan = ao2_bump(bridge_channel->chan);
ao2_unlock(bridge_channel);
return chan;
}
void ast_bridge_channel_lock_bridge(struct ast_bridge_channel *bridge_channel)
{
struct ast_bridge *bridge;
for (;;) {
/* Safely get the bridge pointer */
ast_bridge_channel_lock(bridge_channel);
bridge = bridge_channel->bridge;
ao2_ref(bridge, +1);
ast_bridge_channel_unlock(bridge_channel);
/* Lock the bridge and see if it is still the bridge we need to lock. */
ast_bridge_lock(bridge);
if (bridge == bridge_channel->bridge) {
ao2_ref(bridge, -1);
return;
}
ast_bridge_unlock(bridge);
ao2_ref(bridge, -1);
}
}
int ast_bridge_channel_notify_talking(struct ast_bridge_channel *bridge_channel, int started_talking)
{
struct ast_frame action = {
.frametype = AST_FRAME_BRIDGE_ACTION,
.subclass.integer = started_talking
? BRIDGE_CHANNEL_ACTION_TALKING_START : BRIDGE_CHANNEL_ACTION_TALKING_STOP,
};
return ast_bridge_channel_queue_frame(bridge_channel, &action);
}
/*!
* \internal
* \brief Poke the bridge_channel thread
*/
static void bridge_channel_poke(struct ast_bridge_channel *bridge_channel)
{
if (!pthread_equal(pthread_self(), bridge_channel->thread)) {
/* Wake up the bridge channel thread. */
ast_queue_frame(bridge_channel->chan, &ast_null_frame);
}
}
/*!
* \internal
* \brief Set actual cause on channel.
* \since 12.0.0
*
* \param chan Channel to set cause.
* \param cause Cause to set on channel.
* If cause <= 0 then use cause on channel if cause still <= 0 use AST_CAUSE_NORMAL_CLEARING.
*
* \return Actual cause set on channel.
*/
static int channel_set_cause(struct ast_channel *chan, int cause)
{
ast_channel_lock(chan);
if (cause <= 0) {
cause = ast_channel_hangupcause(chan);
if (cause <= 0) {
cause = AST_CAUSE_NORMAL_CLEARING;
}
}
ast_channel_hangupcause_set(chan, cause);
ast_channel_unlock(chan);
return cause;
}
void ast_bridge_channel_leave_bridge_nolock(struct ast_bridge_channel *bridge_channel, enum bridge_channel_state new_state, int cause)
{
if (bridge_channel->state != BRIDGE_CHANNEL_STATE_WAIT) {
return;
}
ast_debug(1, "Setting %p(%s) state from:%u to:%u\n",
bridge_channel, ast_channel_name(bridge_channel->chan), bridge_channel->state,
new_state);
channel_set_cause(bridge_channel->chan, cause);
ast_channel_lock(bridge_channel->chan);
ast_bridge_vars_set(bridge_channel->chan, NULL, NULL);
ast_channel_unlock(bridge_channel->chan);
/* Change the state on the bridge channel */
bridge_channel->state = new_state;
bridge_channel_poke(bridge_channel);
}
void ast_bridge_channel_leave_bridge(struct ast_bridge_channel *bridge_channel, enum bridge_channel_state new_state, int cause)
{
ast_bridge_channel_lock(bridge_channel);
ast_bridge_channel_leave_bridge_nolock(bridge_channel, new_state, cause);
ast_bridge_channel_unlock(bridge_channel);
}
struct ast_bridge_channel *ast_bridge_channel_peer(struct ast_bridge_channel *bridge_channel)
{
struct ast_bridge *bridge = bridge_channel->bridge;
struct ast_bridge_channel *other = NULL;
if (bridge_channel->in_bridge && bridge->num_channels == 2) {
AST_LIST_TRAVERSE(&bridge->channels, other, entry) {
if (other != bridge_channel) {
break;
}
}
}
return other;
}
void ast_bridge_channel_restore_formats(struct ast_bridge_channel *bridge_channel)
{
ast_assert(bridge_channel->read_format != NULL);
ast_assert(bridge_channel->write_format != NULL);
ast_channel_lock(bridge_channel->chan);
/* Restore original formats of the channel as they came in */
if (ast_format_cmp(ast_channel_readformat(bridge_channel->chan), bridge_channel->read_format) == AST_FORMAT_CMP_NOT_EQUAL) {
ast_debug(1, "Bridge is returning %p(%s) to read format %s\n",
bridge_channel, ast_channel_name(bridge_channel->chan),
ast_format_get_name(bridge_channel->read_format));
if (ast_set_read_format(bridge_channel->chan, bridge_channel->read_format)) {
ast_debug(1, "Bridge failed to return %p(%s) to read format %s\n",
bridge_channel, ast_channel_name(bridge_channel->chan),
ast_format_get_name(bridge_channel->read_format));
}
}
if (ast_format_cmp(ast_channel_writeformat(bridge_channel->chan), bridge_channel->write_format) == AST_FORMAT_CMP_NOT_EQUAL) {
ast_debug(1, "Bridge is returning %p(%s) to write format %s\n",
bridge_channel, ast_channel_name(bridge_channel->chan),
ast_format_get_name(bridge_channel->write_format));
if (ast_set_write_format(bridge_channel->chan, bridge_channel->write_format)) {
ast_debug(1, "Bridge failed to return %p(%s) to write format %s\n",
bridge_channel, ast_channel_name(bridge_channel->chan),
ast_format_get_name(bridge_channel->write_format));
}
}
ast_channel_unlock(bridge_channel->chan);
}
struct ast_bridge *ast_bridge_channel_merge_inhibit(struct ast_bridge_channel *bridge_channel, int request)
{
struct ast_bridge *bridge;
ast_bridge_channel_lock_bridge(bridge_channel);
bridge = bridge_channel->bridge;
ao2_ref(bridge, +1);
bridge_merge_inhibit_nolock(bridge, request);
ast_bridge_unlock(bridge);
return bridge;
}
void ast_bridge_channel_update_linkedids(struct ast_bridge_channel *bridge_channel, struct ast_bridge_channel *swap)
{
struct ast_bridge_channel *other;
struct ast_bridge *bridge = bridge_channel->bridge;
struct ast_channel *oldest_linkedid_chan = bridge_channel->chan;
AST_LIST_TRAVERSE(&bridge->channels, other, entry) {
if (other == swap) {
continue;
}
oldest_linkedid_chan = ast_channel_internal_oldest_linkedid(
oldest_linkedid_chan, other->chan);
}
ast_channel_lock(bridge_channel->chan);
ast_channel_internal_copy_linkedid(bridge_channel->chan, oldest_linkedid_chan);
ast_channel_unlock(bridge_channel->chan);
AST_LIST_TRAVERSE(&bridge->channels, other, entry) {
if (other == swap) {
continue;
}
ast_channel_lock(other->chan);
ast_channel_internal_copy_linkedid(other->chan, oldest_linkedid_chan);
ast_channel_unlock(other->chan);
}
}
/*!
* \internal
* \brief Set dest's empty peeraccount with the src's non-empty accountcode.
* \since 12.5.0
*
* \param dest Channel to update peeraccount.
* \param src Channel to get accountcode from.
*
* \note Both channels are already locked.
*/
static void channel_fill_empty_peeraccount(struct ast_channel *dest, struct ast_channel *src)
{
if (ast_strlen_zero(ast_channel_peeraccount(dest))
&& !ast_strlen_zero(ast_channel_accountcode(src))) {
ast_debug(1, "Setting channel %s peeraccount with channel %s accountcode '%s'.\n",
ast_channel_name(dest),
ast_channel_name(src), ast_channel_accountcode(src));
ast_channel_peeraccount_set(dest, ast_channel_accountcode(src));
}
}
/*!
* \internal
* \brief Set dest's empty accountcode with the src's non-empty peeraccount.
* \since 12.5.0
*
* \param dest Channel to update accountcode.
* \param src Channel to get peeraccount from.
*
* \note Both channels are already locked.
*/
static void channel_fill_empty_accountcode(struct ast_channel *dest, struct ast_channel *src)
{
if (ast_strlen_zero(ast_channel_accountcode(dest))
&& !ast_strlen_zero(ast_channel_peeraccount(src))) {
ast_debug(1, "Setting channel %s accountcode with channel %s peeraccount '%s'.\n",
ast_channel_name(dest),
ast_channel_name(src), ast_channel_peeraccount(src));
ast_channel_accountcode_set(dest, ast_channel_peeraccount(src));
}
}
/*!
* \internal
* \brief Set empty peeraccount and accountcode in a channel from the other channel.
* \since 12.5.0
*
* \param c0 First bridge channel to update.
* \param c1 Second bridge channel to update.
*
* \note Both channels are already locked.
*/
static void channel_set_empty_accountcodes(struct ast_channel *c0, struct ast_channel *c1)
{
/* Set empty peeraccount from the other channel's accountcode. */
channel_fill_empty_peeraccount(c0, c1);
channel_fill_empty_peeraccount(c1, c0);
/* Set empty accountcode from the other channel's peeraccount. */
channel_fill_empty_accountcode(c0, c1);
channel_fill_empty_accountcode(c1, c0);
}
/*!
* \internal
* \brief Update dest's peeraccount with the src's different accountcode.
* \since 12.5.0
*
* \param dest Channel to update peeraccount.
* \param src Channel to get accountcode from.
*
* \note Both channels are already locked.
*/
static void channel_update_peeraccount(struct ast_channel *dest, struct ast_channel *src)
{
if (strcmp(ast_channel_accountcode(src), ast_channel_peeraccount(dest))) {
ast_debug(1, "Changing channel %s peeraccount '%s' to match channel %s accountcode '%s'.\n",
ast_channel_name(dest), ast_channel_peeraccount(dest),
ast_channel_name(src), ast_channel_accountcode(src));
ast_channel_peeraccount_set(dest, ast_channel_accountcode(src));
}
}
/*!
* \internal
* \brief Update peeraccounts to match the other channel's accountcode.
* \since 12.5.0
*
* \param c0 First channel to update.
* \param c1 Second channel to update.
*
* \note Both channels are already locked.
*/
static void channel_update_peeraccounts(struct ast_channel *c0, struct ast_channel *c1)
{
channel_update_peeraccount(c0, c1);
channel_update_peeraccount(c1, c0);
}
/*!
* \internal
* \brief Update channel accountcodes because a channel is joining a bridge.
* \since 12.5.0
*
* \param joining Channel joining the bridge.
* \param swap Channel being replaced by the joining channel. May be NULL.
*
* \note The bridge must be locked prior to calling this function.
*/
static void bridge_channel_update_accountcodes_joining(struct ast_bridge_channel *joining, struct ast_bridge_channel *swap)
{
struct ast_bridge *bridge = joining->bridge;
struct ast_bridge_channel *other;
unsigned int swap_in_bridge = 0;
unsigned int will_be_two_party;
/*
* Only update the peeraccount to match if the joining channel
* will make it a two party bridge.
*/
if (bridge->num_channels <= 2 && swap) {
AST_LIST_TRAVERSE(&bridge->channels, other, entry) {
if (other == swap) {
swap_in_bridge = 1;
break;
}
}
}
will_be_two_party = (1 == bridge->num_channels - swap_in_bridge);
AST_LIST_TRAVERSE(&bridge->channels, other, entry) {
if (other == swap) {
continue;
}
ast_assert(joining != other);
ast_channel_lock_both(joining->chan, other->chan);
channel_set_empty_accountcodes(joining->chan, other->chan);
if (will_be_two_party) {
channel_update_peeraccounts(joining->chan, other->chan);
}
ast_channel_unlock(joining->chan);
ast_channel_unlock(other->chan);
}
}
/*!
* \internal
* \brief Update channel peeraccount codes because a channel has left a bridge.
* \since 12.5.0
*
* \param leaving Channel leaving the bridge. (Has already been removed actually)
*
* \note The bridge must be locked prior to calling this function.
*/
static void bridge_channel_update_accountcodes_leaving(struct ast_bridge_channel *leaving)
{
struct ast_bridge *bridge = leaving->bridge;
struct ast_bridge_channel *first;
struct ast_bridge_channel *second;
if (bridge->num_channels != 2 || bridge->dissolved) {
return;
}
first = AST_LIST_FIRST(&bridge->channels);
second = AST_LIST_LAST(&bridge->channels);
ast_assert(first && first != second);
ast_channel_lock_both(first->chan, second->chan);
channel_set_empty_accountcodes(first->chan, second->chan);
channel_update_peeraccounts(first->chan, second->chan);
ast_channel_unlock(second->chan);
ast_channel_unlock(first->chan);
}
void ast_bridge_channel_update_accountcodes(struct ast_bridge_channel *joining, struct ast_bridge_channel *leaving)
{
if (joining) {
bridge_channel_update_accountcodes_joining(joining, leaving);
} else {
bridge_channel_update_accountcodes_leaving(leaving);
}
}
void ast_bridge_channel_kick(struct ast_bridge_channel *bridge_channel, int cause)
{
struct ast_bridge_features *features = bridge_channel->features;
struct ast_bridge_hook *hook;
struct ao2_iterator iter;
ast_bridge_channel_lock(bridge_channel);
if (bridge_channel->state == BRIDGE_CHANNEL_STATE_WAIT) {
channel_set_cause(bridge_channel->chan, cause);
cause = 0;
}
ast_bridge_channel_unlock(bridge_channel);
/* Run any hangup hooks. */
iter = ao2_iterator_init(features->other_hooks, 0);
for (; (hook = ao2_iterator_next(&iter)); ao2_ref(hook, -1)) {
int remove_me;
if (hook->type != AST_BRIDGE_HOOK_TYPE_HANGUP) {
continue;
}
remove_me = hook->callback(bridge_channel, hook->hook_pvt);
if (remove_me) {
ast_debug(1, "Hangup hook %p is being removed from %p(%s)\n",
hook, bridge_channel, ast_channel_name(bridge_channel->chan));
ao2_unlink(features->other_hooks, hook);
}
}
ao2_iterator_destroy(&iter);
/* Default hangup action. */
ast_bridge_channel_leave_bridge(bridge_channel, BRIDGE_CHANNEL_STATE_END, cause);
}
/*!
* \internal
* \brief Write an \ref ast_frame into the bridge
* \since 12.0.0
*
* \param bridge_channel Which channel is queueing the frame.
* \param frame The frame to write into the bridge
*
* \retval 0 on success.
* \retval -1 on error.
*/
static int bridge_channel_write_frame(struct ast_bridge_channel *bridge_channel, struct ast_frame *frame)
{
const struct ast_control_t38_parameters *t38_parameters;
int unmapped_stream_num;
int deferred;
ast_assert(frame->frametype != AST_FRAME_BRIDGE_ACTION_SYNC);
ast_bridge_channel_lock_bridge(bridge_channel);
/*
* Map the frame to the bridge.
* We need to lock the bridge_channel to make sure that bridge_channel->chan
* isn't NULL and keep it locked while we do multistream processing.
*/
ast_bridge_channel_lock(bridge_channel);
if (bridge_channel->chan && ast_channel_is_multistream(bridge_channel->chan)) {
unmapped_stream_num = frame->stream_num;
switch (frame->frametype) {
case AST_FRAME_VOICE:
case AST_FRAME_VIDEO:
case AST_FRAME_TEXT:
case AST_FRAME_IMAGE:
case AST_FRAME_RTCP:
/* These frames need to be mapped to an appropriate write stream */
if (frame->stream_num < 0) {
/* Map to default stream */
frame->stream_num = -1;
break;
}
if (frame->stream_num < (int)AST_VECTOR_SIZE(&bridge_channel->stream_map.to_bridge)) {
frame->stream_num = AST_VECTOR_GET(
&bridge_channel->stream_map.to_bridge, frame->stream_num);
if (0 <= frame->stream_num) {
break;
}
}
ast_bridge_channel_unlock(bridge_channel);
ast_bridge_unlock(bridge_channel->bridge);
/*
* Ignore frame because we don't know how to map the frame
* or the bridge is not expecting any media from that
* stream.
*/
return 0;
case AST_FRAME_DTMF_BEGIN:
case AST_FRAME_DTMF_END:
/*
* XXX It makes sense that DTMF could be on any audio stream.
* For now we will only put it on the default audio stream.
*/
default:
frame->stream_num = -1;
break;
}
} else {
unmapped_stream_num = -1;
frame->stream_num = -1;
}
ast_bridge_channel_unlock(bridge_channel);
deferred = bridge_channel->bridge->technology->write(bridge_channel->bridge, bridge_channel, frame);
if (deferred) {
struct ast_frame *dup;
dup = ast_frdup(frame);
if (dup) {
/*
* We have to unmap the deferred frame so it comes back
* in like a new frame.
*/
dup->stream_num = unmapped_stream_num;
ast_bridge_channel_lock(bridge_channel);
AST_LIST_INSERT_HEAD(&bridge_channel->deferred_queue, dup, frame_list);
ast_bridge_channel_unlock(bridge_channel);
}
}
/* Remember any owed events to the bridge. */
switch (frame->frametype) {
case AST_FRAME_DTMF_BEGIN:
bridge_channel->owed.dtmf_tv = ast_tvnow();
bridge_channel->owed.dtmf_digit = frame->subclass.integer;
break;
case AST_FRAME_DTMF_END:
bridge_channel->owed.dtmf_digit = '\0';
break;
case AST_FRAME_CONTROL:
/*
* We explicitly will not remember HOLD/UNHOLD frames because
* things like attended transfers will handle them.
*/
switch (frame->subclass.integer) {
case AST_CONTROL_T38_PARAMETERS:
t38_parameters = frame->data.ptr;
switch (t38_parameters->request_response) {
case AST_T38_REQUEST_NEGOTIATE:
case AST_T38_NEGOTIATED:
bridge_channel->owed.t38_terminate = 1;
break;
case AST_T38_REQUEST_TERMINATE:
case AST_T38_TERMINATED:
case AST_T38_REFUSED:
bridge_channel->owed.t38_terminate = 0;
break;
default:
break;
}
break;
default:
break;
}
break;
default:
break;
}
ast_bridge_unlock(bridge_channel->bridge);
/*
* Claim successful write to bridge. If deferred frame
* support is added, claim successfully deferred.
*/
return 0;
}
/*!
* \internal
* \brief Cancel owed events by the channel to the bridge.
* \since 13.8.0
*
* \param bridge_channel Channel that owes events to the bridge.
*
* \note On entry, the bridge_channel->bridge is already locked.
*/
static void bridge_channel_cancel_owed_events(struct ast_bridge_channel *bridge_channel)
{
bridge_channel->owed.dtmf_digit = '\0';
bridge_channel->owed.t38_terminate = 0;
}
void bridge_channel_settle_owed_events(struct ast_bridge *orig_bridge, struct ast_bridge_channel *bridge_channel)
{
if (bridge_channel->owed.dtmf_digit) {
struct ast_frame frame = {
.frametype = AST_FRAME_DTMF_END,
.subclass.integer = bridge_channel->owed.dtmf_digit,
.src = "Bridge channel owed DTMF",
};
frame.len = ast_tvdiff_ms(ast_tvnow(), bridge_channel->owed.dtmf_tv);
if (frame.len < option_dtmfminduration) {
frame.len = option_dtmfminduration;
}
ast_log(LOG_DTMF, "DTMF end '%c' simulated to bridge %s because %s left. Duration %ld ms.\n",
bridge_channel->owed.dtmf_digit, orig_bridge->uniqueid,
ast_channel_name(bridge_channel->chan), frame.len);
bridge_channel->owed.dtmf_digit = '\0';
orig_bridge->technology->write(orig_bridge, NULL, &frame);
}
if (bridge_channel->owed.t38_terminate) {
struct ast_control_t38_parameters t38_parameters = {
.request_response = AST_T38_TERMINATED,
};
struct ast_frame frame = {
.frametype = AST_FRAME_CONTROL,
.subclass.integer = AST_CONTROL_T38_PARAMETERS,
.data.ptr = &t38_parameters,
.datalen = sizeof(t38_parameters),
.src = "Bridge channel owed T.38 terminate",
};
ast_debug(1, "T.38 terminate simulated to bridge %s because %s left.\n",
orig_bridge->uniqueid, ast_channel_name(bridge_channel->chan));
bridge_channel->owed.t38_terminate = 0;
orig_bridge->technology->write(orig_bridge, NULL, &frame);
}
}
void bridge_channel_queue_deferred_frames(struct ast_bridge_channel *bridge_channel)
{
struct ast_frame *frame;
ast_bridge_channel_lock(bridge_channel);
ast_channel_lock(bridge_channel->chan);
while ((frame = AST_LIST_REMOVE_HEAD(&bridge_channel->deferred_queue, frame_list))) {
ast_queue_frame_head(bridge_channel->chan, frame);
ast_frfree(frame);
}
ast_channel_unlock(bridge_channel->chan);
ast_bridge_channel_unlock(bridge_channel);
}
void bridge_channel_internal_suspend_nolock(struct ast_bridge_channel *bridge_channel)
{
bridge_channel->suspended = 1;
if (bridge_channel->in_bridge) {
--bridge_channel->bridge->num_active;
}
/* Get technology bridge threads off of the channel. */
if (bridge_channel->bridge->technology->suspend) {
bridge_channel->bridge->technology->suspend(bridge_channel->bridge, bridge_channel);
}
}
/*!
* \internal
* \brief Suspend a channel from a bridge.
*
* \param bridge_channel Channel to suspend.
*/
static void bridge_channel_suspend(struct ast_bridge_channel *bridge_channel)
{
ast_bridge_channel_lock_bridge(bridge_channel);
bridge_channel_internal_suspend_nolock(bridge_channel);
ast_bridge_unlock(bridge_channel->bridge);
}
void bridge_channel_internal_unsuspend_nolock(struct ast_bridge_channel *bridge_channel)
{
bridge_channel->suspended = 0;
if (bridge_channel->in_bridge) {
++bridge_channel->bridge->num_active;
}
/* Wake technology bridge threads to take care of channel again. */
if (bridge_channel->bridge->technology->unsuspend) {
bridge_channel->bridge->technology->unsuspend(bridge_channel->bridge, bridge_channel);
}
/* Wake suspended channel. */
ast_bridge_channel_lock(bridge_channel);
ast_cond_signal(&bridge_channel->cond);
ast_bridge_channel_unlock(bridge_channel);
}
/*!
* \internal
* \brief Unsuspend a channel from a bridge.
*
* \param bridge_channel Channel to unsuspend.
*/
static void bridge_channel_unsuspend(struct ast_bridge_channel *bridge_channel)
{
ast_bridge_channel_lock_bridge(bridge_channel);
bridge_channel_internal_unsuspend_nolock(bridge_channel);
ast_bridge_unlock(bridge_channel->bridge);
}
/*!
* \internal
* \brief Queue an action frame onto the bridge channel with data.
* \since 12.0.0
*
* \param bridge_channel Which channel to queue the frame onto.
* \param action Type of bridge action frame.
* \param data Frame payload data to pass.
* \param datalen Frame payload data length to pass.
*
* \retval 0 on success.
* \retval -1 on error.
*/
static int bridge_channel_queue_action_data(struct ast_bridge_channel *bridge_channel,
enum bridge_channel_action_type action, const void *data, size_t datalen)
{
struct ast_frame frame = {
.frametype = AST_FRAME_BRIDGE_ACTION,
.subclass.integer = action,
.datalen = datalen,
.data.ptr = (void *) data,
};
return ast_bridge_channel_queue_frame(bridge_channel, &frame);
}
/*!
* \internal
* \brief Queue an action frame onto the bridge channel with data synchronously.
* \since 12.2.0
*
* The function will not return until the queued frame is freed.
*
* \param bridge_channel Which channel to queue the frame onto.
* \param action Type of bridge action frame.
* \param data Frame payload data to pass.
* \param datalen Frame payload data length to pass.
*
* \retval 0 on success.
* \retval -1 on error.
*/
static int bridge_channel_queue_action_data_sync(struct ast_bridge_channel *bridge_channel,
enum bridge_channel_action_type action, const void *data, size_t datalen)
{
struct sync_payload *sync_payload;
int sync_payload_len = sizeof(*sync_payload) + datalen;
struct bridge_sync sync_struct;
struct ast_frame frame = {
.frametype = AST_FRAME_BRIDGE_ACTION_SYNC,
.subclass.integer = action,
};
/* Make sure we don't end up trying to wait on ourself to deliver the frame */
ast_assert(!pthread_equal(pthread_self(), bridge_channel->thread));
sync_payload = ast_alloca(sync_payload_len);
sync_payload->id = ast_atomic_fetchadd_int(&sync_ids, +1);
memcpy(sync_payload->data, data, datalen);
frame.datalen = sync_payload_len;
frame.data.ptr = sync_payload;
bridge_sync_init(&sync_struct, sync_payload->id);
if (ast_bridge_channel_queue_frame(bridge_channel, &frame)) {
bridge_sync_cleanup(&sync_struct);
return -1;
}
bridge_sync_wait(&sync_struct);
bridge_sync_cleanup(&sync_struct);
return 0;
}
/*!
* \internal
* \brief Write an action frame onto the bridge channel with data.
* \since 12.0.0
*
* \param bridge_channel Which channel to queue the frame onto.
* \param action Type of bridge action frame.
* \param data Frame payload data to pass.
* \param datalen Frame payload data length to pass.
*
* \retval 0 on success.
* \retval -1 on error.
*/
static int bridge_channel_write_action_data(struct ast_bridge_channel *bridge_channel,
enum bridge_channel_action_type action, const void *data, size_t datalen)
{
struct ast_frame frame = {
.frametype = AST_FRAME_BRIDGE_ACTION,
.subclass.integer = action,
.datalen = datalen,
.data.ptr = (void *) data,
};
return bridge_channel_write_frame(bridge_channel, &frame);
}
static void bridge_frame_free(struct ast_frame *frame)
{
if (frame->frametype == AST_FRAME_BRIDGE_ACTION_SYNC) {
struct sync_payload *sync_payload = frame->data.ptr;
struct bridge_sync *sync;
AST_RWLIST_RDLOCK(&sync_structs);
AST_RWLIST_TRAVERSE(&sync_structs, sync, list) {
if (sync->id == sync_payload->id) {
break;
}
}
if (sync) {
bridge_sync_signal(sync);
}
AST_RWLIST_UNLOCK(&sync_structs);
}
ast_frfree(frame);
}
int ast_bridge_channel_queue_frame(struct ast_bridge_channel *bridge_channel, struct ast_frame *fr)
{
struct ast_frame *dup;
if (bridge_channel->suspended
/* Also defer DTMF frames. */
&& fr->frametype != AST_FRAME_DTMF_BEGIN
&& fr->frametype != AST_FRAME_DTMF_END
&& !ast_is_deferrable_frame(fr)) {
/* Drop non-deferable frames when suspended. */
return 0;
}
if (fr->frametype == AST_FRAME_NULL) {
/* "Accept" the frame and discard it. */
return 0;
}
if ((fr->frametype == AST_FRAME_VOICE || fr->frametype == AST_FRAME_VIDEO ||
fr->frametype == AST_FRAME_TEXT || fr->frametype == AST_FRAME_IMAGE ||
fr->frametype == AST_FRAME_RTCP) && fr->stream_num > -1) {
int num = -1;
ast_bridge_channel_lock(bridge_channel);
if (fr->stream_num < (int)AST_VECTOR_SIZE(&bridge_channel->stream_map.to_channel)) {
num = AST_VECTOR_GET(&bridge_channel->stream_map.to_channel, fr->stream_num);
}
ast_bridge_channel_unlock(bridge_channel);
if (num == -1) {
/* We don't have a mapped stream so just discard this frame. */
return 0;
}
}
dup = ast_frdup(fr);
if (!dup) {
return -1;
}
ast_bridge_channel_lock(bridge_channel);
if (bridge_channel->state != BRIDGE_CHANNEL_STATE_WAIT) {
/* Drop frames on channels leaving the bridge. */
ast_bridge_channel_unlock(bridge_channel);
bridge_frame_free(dup);
return 0;
}
if ((fr->frametype == AST_FRAME_TEXT || fr->frametype == AST_FRAME_TEXT_DATA) &&
!bridge_channel->features->text_messaging) {
/* This channel is not accepting text messages. */
ast_bridge_channel_unlock(bridge_channel);
bridge_frame_free(dup);
return 0;
}
if (DEBUG_ATLEAST(1)) {
if (fr->frametype == AST_FRAME_TEXT) {
ast_log(LOG_DEBUG, "Queuing TEXT frame to '%s': %*.s\n", ast_channel_name(bridge_channel->chan),
fr->datalen, (char *)fr->data.ptr);
} else if (fr->frametype == AST_FRAME_TEXT_DATA) {
struct ast_msg_data *msg = fr->data.ptr;
ast_log(LOG_DEBUG, "Queueing TEXT_DATA frame from '%s' to '%s:%s': %s\n",
ast_msg_data_get_attribute(msg, AST_MSG_DATA_ATTR_FROM),
ast_msg_data_get_attribute(msg, AST_MSG_DATA_ATTR_TO),
ast_channel_name(bridge_channel->chan),
ast_msg_data_get_attribute(msg, AST_MSG_DATA_ATTR_BODY));
}
}
AST_LIST_INSERT_TAIL(&bridge_channel->wr_queue, dup, frame_list);
if (ast_alertpipe_write(bridge_channel->alert_pipe)) {
ast_log(LOG_ERROR, "We couldn't write alert pipe for %p(%s)... something is VERY wrong\n",
bridge_channel, ast_channel_name(bridge_channel->chan));
}
ast_bridge_channel_unlock(bridge_channel);
return 0;
}
int ast_bridge_queue_everyone_else(struct ast_bridge *bridge, struct ast_bridge_channel *bridge_channel, struct ast_frame *frame)
{
struct ast_bridge_channel *cur;
int not_written = -1;
if (frame->frametype == AST_FRAME_NULL) {
/* "Accept" the frame and discard it. */
return 0;
}
AST_LIST_TRAVERSE(&bridge->channels, cur, entry) {
if (cur == bridge_channel) {
continue;
}
if (!ast_bridge_channel_queue_frame(cur, frame)) {
not_written = 0;
}
}
return not_written;
}
int ast_bridge_channel_queue_control_data(struct ast_bridge_channel *bridge_channel, enum ast_control_frame_type control, const void *data, size_t datalen)
{
struct ast_frame frame = {
.frametype = AST_FRAME_CONTROL,
.subclass.integer = control,
.datalen = datalen,
.data.ptr = (void *) data,
};
return ast_bridge_channel_queue_frame(bridge_channel, &frame);
}
int ast_bridge_channel_write_control_data(struct ast_bridge_channel *bridge_channel, enum ast_control_frame_type control, const void *data, size_t datalen)
{
struct ast_frame frame = {
.frametype = AST_FRAME_CONTROL,
.subclass.integer = control,
.datalen = datalen,
.data.ptr = (void *) data,
};
return bridge_channel_write_frame(bridge_channel, &frame);
}
int ast_bridge_channel_write_hold(struct ast_bridge_channel *bridge_channel, const char *moh_class)
{
struct ast_json *blob;
int res;
size_t datalen;
if (!ast_strlen_zero(moh_class)) {
datalen = strlen(moh_class) + 1;
blob = ast_json_pack("{s: s}",
"musicclass", moh_class);
} else {
moh_class = NULL;
datalen = 0;
blob = NULL;
}
ast_channel_publish_cached_blob(bridge_channel->chan, ast_channel_hold_type(), blob);
res = ast_bridge_channel_write_control_data(bridge_channel, AST_CONTROL_HOLD,
moh_class, datalen);
ast_json_unref(blob);
return res;
}
int ast_bridge_channel_write_unhold(struct ast_bridge_channel *bridge_channel)
{
struct ast_channel *chan = ast_bridge_channel_get_chan(bridge_channel);
if (!chan) {
return -1;
}
ast_channel_publish_cached_blob(chan, ast_channel_unhold_type(), NULL);
ao2_ref(chan, -1);
return ast_bridge_channel_write_control_data(bridge_channel, AST_CONTROL_UNHOLD, NULL, 0);
}
/*!
* \internal
* \brief Helper function to kick off a PBX app on a bridge_channel
*/
static int run_app_helper(struct ast_channel *chan, const char *app_name, const char *app_args)
{
int res = 0;
if (!strcasecmp("Gosub", app_name)) {
ast_app_exec_sub(NULL, chan, app_args, 0);
} else if (!strcasecmp("Macro", app_name)) {
ast_app_exec_macro(NULL, chan, app_args);
} else {
res = ast_pbx_exec_application(chan, app_name, app_args);
}
return res;
}
void ast_bridge_channel_run_app(struct ast_bridge_channel *bridge_channel, const char *app_name, const char *app_args, const char *moh_class)
{
if (moh_class) {
ast_bridge_channel_write_hold(bridge_channel, moh_class);
}
if (run_app_helper(bridge_channel->chan, app_name, S_OR(app_args, ""))) {
/* Break the bridge if the app returns non-zero. */
ast_bridge_channel_kick(bridge_channel, AST_CAUSE_NORMAL_CLEARING);
}
if (moh_class) {
ast_bridge_channel_write_unhold(bridge_channel);
}
}
struct bridge_run_app {
/*! Offset into app_name[] where the MOH class name starts. (zero if no MOH) */
int moh_offset;
/*! Offset into app_name[] where the application argument string starts. (zero if no arguments) */
int app_args_offset;
/*! Application name to run. */
char app_name[0];
};
/*!
* \internal
* \brief Handle the run application bridge action.
* \since 12.0.0
*
* \param bridge_channel Which channel to run the application on.
* \param data Action frame data to run the application.
*/
static void bridge_channel_run_app(struct ast_bridge_channel *bridge_channel, struct bridge_run_app *data)
{
ast_bridge_channel_run_app(bridge_channel, data->app_name,
data->app_args_offset ? &data->app_name[data->app_args_offset] : NULL,
data->moh_offset ? &data->app_name[data->moh_offset] : NULL);
}
/*!
* \internal
* \brief Marshal an application to be executed on a bridge_channel
*/
static int payload_helper_app(ast_bridge_channel_post_action_data post_it,
struct ast_bridge_channel *bridge_channel, const char *app_name, const char *app_args, const char *moh_class)
{
struct bridge_run_app *app_data;
size_t len_name = strlen(app_name) + 1;
size_t len_args = ast_strlen_zero(app_args) ? 0 : strlen(app_args) + 1;
size_t len_moh = !moh_class ? 0 : strlen(moh_class) + 1;
size_t len_data = sizeof(*app_data) + len_name + len_args + len_moh;
/* Fill in application run frame data. */
app_data = alloca(len_data);
app_data->app_args_offset = len_args ? len_name : 0;
app_data->moh_offset = len_moh ? len_name + len_args : 0;
strcpy(app_data->app_name, app_name);/* Safe */
if (len_args) {
strcpy(&app_data->app_name[app_data->app_args_offset], app_args);/* Safe */
}
if (moh_class) {
strcpy(&app_data->app_name[app_data->moh_offset], moh_class);/* Safe */
}
return post_it(bridge_channel, BRIDGE_CHANNEL_ACTION_RUN_APP, app_data, len_data);
}
int ast_bridge_channel_write_app(struct ast_bridge_channel *bridge_channel, const char *app_name, const char *app_args, const char *moh_class)
{
return payload_helper_app(bridge_channel_write_action_data,
bridge_channel, app_name, app_args, moh_class);
}
int ast_bridge_channel_queue_app(struct ast_bridge_channel *bridge_channel, const char *app_name, const char *app_args, const char *moh_class)
{
return payload_helper_app(bridge_channel_queue_action_data,
bridge_channel, app_name, app_args, moh_class);
}
void ast_bridge_channel_playfile(struct ast_bridge_channel *bridge_channel, ast_bridge_custom_play_fn custom_play, const char *playfile, const char *moh_class)
{
if (moh_class) {
ast_bridge_channel_write_hold(bridge_channel, moh_class);
}
if (custom_play) {
custom_play(bridge_channel, playfile);
} else {
ast_stream_and_wait(bridge_channel->chan, playfile, AST_DIGIT_NONE);
}
if (moh_class) {
ast_bridge_channel_write_unhold(bridge_channel);
}
/*
* It may be necessary to resume music on hold after we finish
* playing the announcment.
*/
if (ast_test_flag(ast_channel_flags(bridge_channel->chan), AST_FLAG_MOH)) {
const char *latest_musicclass;
ast_channel_lock(bridge_channel->chan);
latest_musicclass = ast_strdupa(ast_channel_latest_musicclass(bridge_channel->chan));
ast_channel_unlock(bridge_channel->chan);
ast_moh_start(bridge_channel->chan, latest_musicclass, NULL);
}
}
struct bridge_playfile {
/*! Call this function to play the playfile. (NULL if normal sound file to play) */
ast_bridge_custom_play_fn custom_play;
/*! Offset into playfile[] where the MOH class name starts. (zero if no MOH)*/
int moh_offset;
/*! Filename to play. */
char playfile[0];
};
/*!
* \internal
* \brief Handle the playfile bridge action.
* \since 12.0.0
*
* \param bridge_channel Which channel to play a file on.
* \param payload Action frame payload to play a file.
*/
static void bridge_channel_playfile(struct ast_bridge_channel *bridge_channel, struct bridge_playfile *payload)
{
ast_bridge_channel_playfile(bridge_channel, payload->custom_play, payload->playfile,
payload->moh_offset ? &payload->playfile[payload->moh_offset] : NULL);
}
/*!
* \internal
* \brief Marshal a file to be played on a bridge_channel
*/
static int payload_helper_playfile(ast_bridge_channel_post_action_data post_it,
struct ast_bridge_channel *bridge_channel, ast_bridge_custom_play_fn custom_play, const char *playfile, const char *moh_class)
{
struct bridge_playfile *payload;
size_t len_name = strlen(playfile) + 1;
size_t len_moh = !moh_class ? 0 : strlen(moh_class) + 1;
size_t len_payload = sizeof(*payload) + len_name + len_moh;
/* Fill in play file frame data. */
payload = ast_alloca(len_payload);
payload->custom_play = custom_play;
payload->moh_offset = len_moh ? len_name : 0;
strcpy(payload->playfile, playfile);/* Safe */
if (moh_class) {
strcpy(&payload->playfile[payload->moh_offset], moh_class);/* Safe */
}
return post_it(bridge_channel, BRIDGE_CHANNEL_ACTION_PLAY_FILE, payload, len_payload);
}
int ast_bridge_channel_write_playfile(struct ast_bridge_channel *bridge_channel, ast_bridge_custom_play_fn custom_play, const char *playfile, const char *moh_class)
{
return payload_helper_playfile(bridge_channel_write_action_data,
bridge_channel, custom_play, playfile, moh_class);
}
int ast_bridge_channel_queue_playfile(struct ast_bridge_channel *bridge_channel, ast_bridge_custom_play_fn custom_play, const char *playfile, const char *moh_class)
{
return payload_helper_playfile(bridge_channel_queue_action_data,
bridge_channel, custom_play, playfile, moh_class);
}
int ast_bridge_channel_queue_playfile_sync(struct ast_bridge_channel *bridge_channel,
ast_bridge_custom_play_fn custom_play, const char *playfile, const char *moh_class)
{
return payload_helper_playfile(bridge_channel_queue_action_data_sync,
bridge_channel, custom_play, playfile, moh_class);
}
struct bridge_custom_callback {
/*! Call this function on the bridge channel thread. */
ast_bridge_custom_callback_fn callback;
/*! Size of the payload if it exists. A number otherwise. */
size_t payload_size;
/*! Option flags determining how callback is called. */
unsigned int flags;
/*! Nonzero if the payload exists. */
char payload_exists;
/*! Payload to give to callback. */
char payload[0];
};
/*!
* \internal
* \brief Handle the do custom callback bridge action.
* \since 12.0.0
*
* \param bridge_channel Which channel to call the callback on.
* \param data Action frame data to call the callback.
*/
static void bridge_channel_do_callback(struct ast_bridge_channel *bridge_channel, struct bridge_custom_callback *data)
{
if (ast_test_flag(data, AST_BRIDGE_CHANNEL_CB_OPTION_MEDIA)) {
bridge_channel_suspend(bridge_channel);
ast_indicate(bridge_channel->chan, AST_CONTROL_SRCUPDATE);
}
data->callback(bridge_channel, data->payload_exists ? data->payload : NULL, data->payload_size);
if (ast_test_flag(data, AST_BRIDGE_CHANNEL_CB_OPTION_MEDIA)) {
ast_indicate(bridge_channel->chan, AST_CONTROL_SRCUPDATE);
bridge_channel_unsuspend(bridge_channel);
}
}
/*!
* \internal
* \brief Marshal a custom callback function to be called on a bridge_channel
*/
static int payload_helper_cb(ast_bridge_channel_post_action_data post_it,
struct ast_bridge_channel *bridge_channel,
enum ast_bridge_channel_custom_callback_option flags,
ast_bridge_custom_callback_fn callback, const void *payload, size_t payload_size)
{
struct bridge_custom_callback *cb_data;
size_t len_data = sizeof(*cb_data) + (payload ? payload_size : 0);
/* Sanity check. */
if (!callback) {
ast_assert(0);
return -1;
}
/* Fill in custom callback frame data. */
cb_data = alloca(len_data);
cb_data->callback = callback;
cb_data->payload_size = payload_size;
cb_data->flags = flags;
cb_data->payload_exists = payload && payload_size;
if (cb_data->payload_exists) {
memcpy(cb_data->payload, payload, payload_size);/* Safe */
}
return post_it(bridge_channel, BRIDGE_CHANNEL_ACTION_CALLBACK, cb_data, len_data);
}
int ast_bridge_channel_write_callback(struct ast_bridge_channel *bridge_channel,
enum ast_bridge_channel_custom_callback_option flags,
ast_bridge_custom_callback_fn callback, const void *payload, size_t payload_size)
{
return payload_helper_cb(bridge_channel_write_action_data,
bridge_channel, flags, callback, payload, payload_size);
}
int ast_bridge_channel_queue_callback(struct ast_bridge_channel *bridge_channel,
enum ast_bridge_channel_custom_callback_option flags,
ast_bridge_custom_callback_fn callback, const void *payload, size_t payload_size)
{
return payload_helper_cb(bridge_channel_queue_action_data,
bridge_channel, flags, callback, payload, payload_size);
}
struct bridge_park {
int parker_uuid_offset;
int app_data_offset;
/* buffer used for holding those strings */
char parkee_uuid[0];
};
/*!
* \internal
* \brief Park a bridge_cahnnel
*/
static void bridge_channel_park(struct ast_bridge_channel *bridge_channel, struct bridge_park *payload)
{
if (!ast_parking_provider_registered()) {
ast_log(AST_LOG_WARNING, "Unable to park %s: No parking provider loaded!\n",
ast_channel_name(bridge_channel->chan));
return;
}
if (ast_parking_park_bridge_channel(bridge_channel, payload->parkee_uuid,
&payload->parkee_uuid[payload->parker_uuid_offset],
payload->app_data_offset ? &payload->parkee_uuid[payload->app_data_offset] : NULL)) {
ast_log(AST_LOG_WARNING, "Error occurred while parking %s\n",
ast_channel_name(bridge_channel->chan));
}
}
/*!
* \internal
* \brief Marshal a park action onto a bridge_channel
*/
static int payload_helper_park(ast_bridge_channel_post_action_data post_it,
struct ast_bridge_channel *bridge_channel,
const char *parkee_uuid,
const char *parker_uuid,
const char *app_data)
{
struct bridge_park *payload;
size_t len_parkee_uuid = strlen(parkee_uuid) + 1;
size_t len_parker_uuid = strlen(parker_uuid) + 1;
size_t len_app_data = !app_data ? 0 : strlen(app_data) + 1;
size_t len_payload = sizeof(*payload) + len_parker_uuid + len_parkee_uuid + len_app_data;
payload = alloca(len_payload);
payload->app_data_offset = len_app_data ? len_parkee_uuid + len_parker_uuid : 0;
payload->parker_uuid_offset = len_parkee_uuid;
strcpy(payload->parkee_uuid, parkee_uuid);
strcpy(&payload->parkee_uuid[payload->parker_uuid_offset], parker_uuid);
if (app_data) {
strcpy(&payload->parkee_uuid[payload->app_data_offset], app_data);
}
return post_it(bridge_channel, BRIDGE_CHANNEL_ACTION_PARK, payload, len_payload);
}
int ast_bridge_channel_write_park(struct ast_bridge_channel *bridge_channel, const char *parkee_uuid, const char *parker_uuid, const char *app_data)
{
return payload_helper_park(bridge_channel_write_action_data,
bridge_channel, parkee_uuid, parker_uuid, app_data);
}
/*!
* \internal
* \brief Handle bridge channel interval expiration.
* \since 12.0.0
*
* \param bridge_channel Channel to run expired intervals on.
*/
static void bridge_channel_handle_interval(struct ast_bridge_channel *bridge_channel)
{
struct ast_heap *interval_hooks;
struct ast_bridge_hook_timer *hook;
struct timeval start;
int chan_suspended = 0;
interval_hooks = bridge_channel->features->interval_hooks;
ast_heap_wrlock(interval_hooks);
start = ast_tvnow();
while ((hook = ast_heap_peek(interval_hooks, 1))) {
int interval;
unsigned int execution_time;
if (ast_tvdiff_ms(hook->timer.trip_time, start) > 0) {
ast_debug(1, "Hook %p on %p(%s) wants to happen in the future, stopping our traversal\n",
hook, bridge_channel, ast_channel_name(bridge_channel->chan));
break;
}
ao2_ref(hook, +1);
ast_heap_unlock(interval_hooks);
if (!chan_suspended
&& ast_test_flag(&hook->timer, AST_BRIDGE_HOOK_TIMER_OPTION_MEDIA)) {
chan_suspended = 1;
bridge_channel_suspend(bridge_channel);
ast_indicate(bridge_channel->chan, AST_CONTROL_SRCUPDATE);
}
ast_debug(1, "Executing hook %p on %p(%s)\n",
hook, bridge_channel, ast_channel_name(bridge_channel->chan));
interval = hook->generic.callback(bridge_channel, hook->generic.hook_pvt);
ast_heap_wrlock(interval_hooks);
if (ast_heap_peek(interval_hooks, hook->timer.heap_index) != hook
|| !ast_heap_remove(interval_hooks, hook)) {
/* Interval hook is already removed from the bridge_channel. */
ao2_ref(hook, -1);
continue;
}
ao2_ref(hook, -1);
if (interval < 0) {
ast_debug(1, "Removed interval hook %p from %p(%s)\n",
hook, bridge_channel, ast_channel_name(bridge_channel->chan));
ao2_ref(hook, -1);
continue;
}
if (interval) {
/* Set new interval for the hook. */
hook->timer.interval = interval;
}
ast_debug(1, "Updating interval hook %p with interval %u on %p(%s)\n",
hook, hook->timer.interval, bridge_channel,
ast_channel_name(bridge_channel->chan));
/* resetting start */
start = ast_tvnow();
/*
* Resetup the interval hook for the next interval. We may need
* to skip over any missed intervals because the hook was
* delayed or took too long.
*/
execution_time = ast_tvdiff_ms(start, hook->timer.trip_time);
while (hook->timer.interval < execution_time) {
execution_time -= hook->timer.interval;
}
hook->timer.trip_time = ast_tvadd(start, ast_samp2tv(hook->timer.interval - execution_time, 1000));
hook->timer.seqno = ast_atomic_fetchadd_int((int *) &bridge_channel->features->interval_sequence, +1);
if (ast_heap_push(interval_hooks, hook)) {
/* Could not push the hook back onto the heap. */
ao2_ref(hook, -1);
}
}
ast_heap_unlock(interval_hooks);
if (chan_suspended) {
ast_indicate(bridge_channel->chan, AST_CONTROL_SRCUPDATE);
bridge_channel_unsuspend(bridge_channel);
}
}
/*!
* \internal
* \brief Write a DTMF stream out to a channel
*/
static int bridge_channel_write_dtmf_stream(struct ast_bridge_channel *bridge_channel, const char *dtmf)
{
return bridge_channel_write_action_data(bridge_channel,
BRIDGE_CHANNEL_ACTION_DTMF_STREAM, dtmf, strlen(dtmf) + 1);
}
/*!
* \internal
* \brief Indicate to the testsuite a feature was successfully detected.
*
* Currently, this function only will relay built-in features to the testsuite,
* but it could be modified to detect applicationmap items should the need arise.
*
* \param chan The channel that activated the feature
* \param dtmf The DTMF sequence entered to activate the feature
*/
static void testsuite_notify_feature_success(struct ast_channel *chan, const char *dtmf)
{
#ifdef TEST_FRAMEWORK
char *feature = "unknown";
struct ast_featuremap_config *featuremap;
struct ast_features_xfer_config *xfer;
ast_channel_lock(chan);
featuremap = ast_get_chan_featuremap_config(chan);
xfer = ast_get_chan_features_xfer_config(chan);
ast_channel_unlock(chan);
if (featuremap) {
if (!strcmp(dtmf, featuremap->blindxfer)) {
feature = "blindxfer";
} else if (!strcmp(dtmf, featuremap->atxfer)) {
feature = "atxfer";
} else if (!strcmp(dtmf, featuremap->disconnect)) {
feature = "disconnect";
} else if (!strcmp(dtmf, featuremap->automon)) {
feature = "automon";
} else if (!strcmp(dtmf, featuremap->automixmon)) {
feature = "automixmon";
} else if (!strcmp(dtmf, featuremap->parkcall)) {
feature = "parkcall";
}
}
if (xfer) {
if (!strcmp(dtmf, xfer->atxferthreeway)) {
feature = "atxferthreeway";
}
}
ao2_cleanup(featuremap);
ao2_cleanup(xfer);
ast_test_suite_event_notify("FEATURE_DETECTION",
"Result: success\r\n"
"Feature: %s", feature);
#endif /* TEST_FRAMEWORK */
}
static int bridge_channel_feature_digit_add(
struct ast_bridge_channel *bridge_channel, int digit, size_t dtmf_len)
{
if (dtmf_len < ARRAY_LEN(bridge_channel->dtmf_hook_state.collected) - 1) {
/* Add the new digit to the DTMF string so we can do our matching */
bridge_channel->dtmf_hook_state.collected[dtmf_len++] = digit;
bridge_channel->dtmf_hook_state.collected[dtmf_len] = '\0';
ast_debug(1, "DTMF feature string on %p(%s) is now '%s'\n",
bridge_channel, ast_channel_name(bridge_channel->chan),
bridge_channel->dtmf_hook_state.collected);
}
return dtmf_len;
}
static unsigned int bridge_channel_feature_digit_timeout(struct ast_bridge_channel *bridge_channel)
{
unsigned int digit_timeout;
struct ast_features_general_config *gen_cfg;
/* Determine interdigit timeout */
ast_channel_lock(bridge_channel->chan);
gen_cfg = ast_get_chan_features_general_config(bridge_channel->chan);
ast_channel_unlock(bridge_channel->chan);
if (!gen_cfg) {
ast_log(LOG_ERROR, "Unable to retrieve features configuration.\n");
return 3000; /* Pick a reasonable failsafe timeout in ms */
}
digit_timeout = gen_cfg->featuredigittimeout;
ao2_ref(gen_cfg, -1);
return digit_timeout;
}
void ast_bridge_channel_feature_digit_add(struct ast_bridge_channel *bridge_channel, int digit)
{
if (digit) {
bridge_channel_feature_digit_add(
bridge_channel, digit, strlen(bridge_channel->dtmf_hook_state.collected));
}
}
void ast_bridge_channel_feature_digit(struct ast_bridge_channel *bridge_channel, int digit)
{
struct ast_bridge_features *features = bridge_channel->features;
struct ast_bridge_hook_dtmf *hook = NULL;
size_t dtmf_len;
struct sanity_check_of_dtmf_size {
char check[1 / (ARRAY_LEN(bridge_channel->dtmf_hook_state.collected) == ARRAY_LEN(hook->dtmf.code))];
};
dtmf_len = strlen(bridge_channel->dtmf_hook_state.collected);
if (!dtmf_len && !digit) {
/* Nothing to do */
return;
}
if (digit) {
dtmf_len = bridge_channel_feature_digit_add(bridge_channel, digit, dtmf_len);
}
while (digit) {
/* See if a DTMF feature hook matches or can match */
hook = ao2_find(features->dtmf_hooks, bridge_channel->dtmf_hook_state.collected,
OBJ_SEARCH_PARTIAL_KEY);
if (!hook) {
ast_debug(1, "No DTMF feature hooks on %p(%s) match '%s'\n",
bridge_channel, ast_channel_name(bridge_channel->chan),
bridge_channel->dtmf_hook_state.collected);
break;
} else if (dtmf_len != strlen(hook->dtmf.code)) {
unsigned int digit_timeout;
/* Need more digits to match */
ao2_ref(hook, -1);
digit_timeout = bridge_channel_feature_digit_timeout(bridge_channel);
bridge_channel->dtmf_hook_state.interdigit_timeout =
ast_tvadd(ast_tvnow(), ast_samp2tv(digit_timeout, 1000));
return;
} else {
int remove_me;
int already_suspended;
ast_debug(1, "DTMF feature hook %p matched DTMF string '%s' on %p(%s)\n",
hook, bridge_channel->dtmf_hook_state.collected, bridge_channel,
ast_channel_name(bridge_channel->chan));
/*
* Clear the collected digits before executing the hook
* in case the hook starts another sequence.
*/
bridge_channel->dtmf_hook_state.collected[0] = '\0';
ast_bridge_channel_lock_bridge(bridge_channel);
already_suspended = bridge_channel->suspended;
if (!already_suspended) {
bridge_channel_internal_suspend_nolock(bridge_channel);
}
ast_bridge_unlock(bridge_channel->bridge);
ast_indicate(bridge_channel->chan, AST_CONTROL_SRCUPDATE);
/* Execute the matched hook on this channel. */
remove_me = hook->generic.callback(bridge_channel, hook->generic.hook_pvt);
if (remove_me) {
ast_debug(1, "DTMF hook %p is being removed from %p(%s)\n",
hook, bridge_channel, ast_channel_name(bridge_channel->chan));
ao2_unlink(features->dtmf_hooks, hook);
}
testsuite_notify_feature_success(bridge_channel->chan, hook->dtmf.code);
ao2_ref(hook, -1);
ast_indicate(bridge_channel->chan, AST_CONTROL_SRCUPDATE);
if (!already_suspended) {
bridge_channel_unsuspend(bridge_channel);
}
/*
* If we are handing the channel off to an external hook for
* ownership, we are not guaranteed what kind of state it will
* come back in. If the channel hungup, we need to detect that
* here if the hook did not already change the state.
*/
if (bridge_channel->chan && ast_check_hangup_locked(bridge_channel->chan)) {
ast_bridge_channel_kick(bridge_channel, 0);
bridge_channel->dtmf_hook_state.collected[0] = '\0';
return;
}
/* if there is dtmf that has been collected then loop back through,
but set digit to -1 so it doesn't try to do an add since the dtmf
is already in the buffer */
dtmf_len = strlen(bridge_channel->dtmf_hook_state.collected);
if (!dtmf_len) {
return;
}
}
}
if (!digit) {
ast_debug(1, "DTMF feature string collection on %p(%s) timed out\n",
bridge_channel, ast_channel_name(bridge_channel->chan));
}
/* Timeout or DTMF digit didn't allow a match with any hooks. */
if (features->dtmf_passthrough) {
/* Stream the collected DTMF to the other channels. */
bridge_channel_write_dtmf_stream(bridge_channel,
bridge_channel->dtmf_hook_state.collected);
}
bridge_channel->dtmf_hook_state.collected[0] = '\0';
ast_test_suite_event_notify("FEATURE_DETECTION", "Result: fail");
}
/*!
* \internal
* \brief Handle bridge channel DTMF feature timeout expiration.
* \since 12.8.0
*
* \param bridge_channel Channel to check expired interdigit timer on.
*/
static void bridge_channel_handle_feature_timeout(struct ast_bridge_channel *bridge_channel)
{
if (!bridge_channel->dtmf_hook_state.collected[0]
|| 0 < ast_tvdiff_ms(bridge_channel->dtmf_hook_state.interdigit_timeout,
ast_tvnow())) {
/* Not within a sequence or not timed out. */
return;
}
ast_bridge_channel_feature_digit(bridge_channel, 0);
}
/*!
* \internal
* \brief Indicate that a bridge_channel is talking
*/
static void bridge_channel_talking(struct ast_bridge_channel *bridge_channel, int talking)
{
struct ast_bridge_features *features = bridge_channel->features;
struct ast_bridge_hook *hook;
struct ao2_iterator iter;
/* Run any talk detection hooks. */
iter = ao2_iterator_init(features->other_hooks, 0);
for (; (hook = ao2_iterator_next(&iter)); ao2_ref(hook, -1)) {
int remove_me;
ast_bridge_talking_indicate_callback talk_cb;
if (hook->type != AST_BRIDGE_HOOK_TYPE_TALK) {
continue;
}
talk_cb = (ast_bridge_talking_indicate_callback) hook->callback;
remove_me = talk_cb(bridge_channel, hook->hook_pvt, talking);
if (remove_me) {
ast_debug(1, "Talk detection hook %p is being removed from %p(%s)\n",
hook, bridge_channel, ast_channel_name(bridge_channel->chan));
ao2_unlink(features->other_hooks, hook);
}
}
ao2_iterator_destroy(&iter);
}
/*!
* \internal
* \brief Play back DTMF on a bridge channel
*/
static void bridge_channel_dtmf_stream(struct ast_bridge_channel *bridge_channel, const char *dtmf)
{
ast_debug(1, "Playing DTMF stream '%s' out to %p(%s)\n",
dtmf, bridge_channel, ast_channel_name(bridge_channel->chan));
ast_dtmf_stream(bridge_channel->chan, NULL, dtmf, 0, 0);
}
/*! \brief Data specifying where a blind transfer is going to */
struct blind_transfer_data {
char exten[AST_MAX_EXTENSION];
char context[AST_MAX_CONTEXT];
};
/*!
* \internal
* \brief Execute after bridge actions on a channel when it leaves a bridge
*/
static void after_bridge_move_channel(struct ast_channel *chan_bridged, void *data)
{
RAII_VAR(struct ast_channel *, chan_target, data, ao2_cleanup);
struct ast_party_connected_line connected_target;
unsigned char connected_line_data[1024];
int payload_size;
ast_party_connected_line_init(&connected_target);
ast_channel_lock(chan_target);
ast_party_connected_line_copy(&connected_target, ast_channel_connected(chan_target));
ast_channel_unlock(chan_target);
ast_party_id_reset(&connected_target.priv);
if (ast_channel_move(chan_target, chan_bridged)) {
ast_softhangup(chan_target, AST_SOFTHANGUP_DEV);
ast_party_connected_line_free(&connected_target);
return;
}
/* The ast_channel_move function will end up updating the connected line information
* on chan_target to the value we have here, but will not inform it. To ensure that
* AST_FRAME_READ_ACTION_CONNECTED_LINE_MACRO is executed we wipe it away here. If
* we don't do this then the change will be considered redundant, since the connected
* line information is already there (despite the channel not being told).
*/
ast_channel_lock(chan_target);
ast_party_connected_line_free(ast_channel_connected_indicated(chan_target));
ast_party_connected_line_init(ast_channel_connected_indicated(chan_target));
ast_channel_unlock(chan_target);
if ((payload_size = ast_connected_line_build_data(connected_line_data,
sizeof(connected_line_data), &connected_target, NULL)) != -1) {
struct ast_control_read_action_payload *frame_payload;
int frame_size;
frame_size = payload_size + sizeof(*frame_payload);
frame_payload = ast_alloca(frame_size);
frame_payload->action = AST_FRAME_READ_ACTION_CONNECTED_LINE_MACRO;
frame_payload->payload_size = payload_size;
memcpy(frame_payload->payload, connected_line_data, payload_size);
ast_queue_control_data(chan_target, AST_CONTROL_READ_ACTION, frame_payload, frame_size);
}
/* A connected line update is queued so that if chan_target is remotely involved with
* anything (such as dialing a channel) the other channel(s) will be informed of the
* new channel they are involved with.
*/
ast_channel_lock(chan_target);
ast_connected_line_copy_from_caller(&connected_target, ast_channel_caller(chan_target));
ast_channel_queue_connected_line_update(chan_target, &connected_target, NULL);
ast_channel_unlock(chan_target);
ast_party_connected_line_free(&connected_target);
}
/*!
* \internal
* \brief Execute logic to cleanup when after bridge fails
*/
static void after_bridge_move_channel_fail(enum ast_bridge_after_cb_reason reason, void *data)
{
RAII_VAR(struct ast_channel *, chan_target, data, ao2_cleanup);
ast_log(LOG_WARNING, "Unable to complete transfer: %s\n",
ast_bridge_after_cb_reason_string(reason));
ast_softhangup(chan_target, AST_SOFTHANGUP_DEV);
}
/*!
* \internal
* \brief Perform a blind transfer on a channel in a bridge
*/
static void bridge_channel_blind_transfer(struct ast_bridge_channel *bridge_channel,
struct blind_transfer_data *blind_data)
{
ast_async_goto(bridge_channel->chan, blind_data->context, blind_data->exten, 1);
ast_bridge_channel_kick(bridge_channel, AST_CAUSE_NORMAL_CLEARING);
}
/*!
* \internal
* \brief Perform an attended transfer on a channel in a bridge
*/
static void bridge_channel_attended_transfer(struct ast_bridge_channel *bridge_channel,
const char *target_chan_name)
{
RAII_VAR(struct ast_channel *, chan_target, NULL, ao2_cleanup);
RAII_VAR(struct ast_channel *, chan_bridged, NULL, ao2_cleanup);
chan_target = ast_channel_get_by_name(target_chan_name);
if (!chan_target) {
/* Dang, it disappeared somehow */
ast_bridge_channel_kick(bridge_channel, AST_CAUSE_NORMAL_CLEARING);
return;
}
ast_bridge_channel_lock(bridge_channel);
chan_bridged = bridge_channel->chan;
ast_assert(chan_bridged != NULL);
ao2_ref(chan_bridged, +1);
ast_bridge_channel_unlock(bridge_channel);
if (ast_bridge_set_after_callback(chan_bridged, after_bridge_move_channel,
after_bridge_move_channel_fail, ast_channel_ref(chan_target))) {
ast_softhangup(chan_target, AST_SOFTHANGUP_DEV);
/* Release the ref we tried to pass to ast_bridge_set_after_callback(). */
ast_channel_unref(chan_target);
}
ast_bridge_channel_kick(bridge_channel, AST_CAUSE_NORMAL_CLEARING);
}
/*!
* \internal
* \brief Handle bridge channel bridge action frame.
* \since 12.0.0
*
* \param bridge_channel Channel to execute the action on.
* \param action What to do.
* \param data data from the action.
*/
static void bridge_channel_handle_action(struct ast_bridge_channel *bridge_channel,
enum bridge_channel_action_type action, void *data)
{
switch (action) {
case BRIDGE_CHANNEL_ACTION_DTMF_STREAM:
bridge_channel_suspend(bridge_channel);
ast_indicate(bridge_channel->chan, AST_CONTROL_SRCUPDATE);
bridge_channel_dtmf_stream(bridge_channel, data);
ast_indicate(bridge_channel->chan, AST_CONTROL_SRCUPDATE);
bridge_channel_unsuspend(bridge_channel);
break;
case BRIDGE_CHANNEL_ACTION_TALKING_START:
case BRIDGE_CHANNEL_ACTION_TALKING_STOP:
bridge_channel_talking(bridge_channel,
action == BRIDGE_CHANNEL_ACTION_TALKING_START);
break;
case BRIDGE_CHANNEL_ACTION_PLAY_FILE:
bridge_channel_suspend(bridge_channel);
ast_indicate(bridge_channel->chan, AST_CONTROL_SRCUPDATE);
bridge_channel_playfile(bridge_channel, data);
ast_indicate(bridge_channel->chan, AST_CONTROL_SRCUPDATE);
bridge_channel_unsuspend(bridge_channel);
break;
case BRIDGE_CHANNEL_ACTION_RUN_APP:
bridge_channel_suspend(bridge_channel);
ast_indicate(bridge_channel->chan, AST_CONTROL_SRCUPDATE);
bridge_channel_run_app(bridge_channel, data);
ast_indicate(bridge_channel->chan, AST_CONTROL_SRCUPDATE);
bridge_channel_unsuspend(bridge_channel);
break;
case BRIDGE_CHANNEL_ACTION_CALLBACK:
bridge_channel_do_callback(bridge_channel, data);
break;
case BRIDGE_CHANNEL_ACTION_PARK:
bridge_channel_suspend(bridge_channel);
ast_indicate(bridge_channel->chan, AST_CONTROL_SRCUPDATE);
bridge_channel_park(bridge_channel, data);
ast_indicate(bridge_channel->chan, AST_CONTROL_SRCUPDATE);
bridge_channel_unsuspend(bridge_channel);
break;
case BRIDGE_CHANNEL_ACTION_BLIND_TRANSFER:
bridge_channel_blind_transfer(bridge_channel, data);
break;
case BRIDGE_CHANNEL_ACTION_ATTENDED_TRANSFER:
bridge_channel_attended_transfer(bridge_channel, data);
break;
default:
break;
}
/* While invoking an action it is possible for the channel to be hung up. So
* that the bridge respects this we check here and if hung up kick it out.
*/
if (bridge_channel->chan && ast_check_hangup_locked(bridge_channel->chan)) {
ast_bridge_channel_kick(bridge_channel, 0);
}
}
/*!
* \internal
* \brief Check if a bridge should dissolve and do it.
* \since 12.0.0
*
* \param bridge_channel Channel causing the check.
*
* \note On entry, bridge_channel->bridge is already locked.
*/
static void bridge_channel_dissolve_check(struct ast_bridge_channel *bridge_channel)
{
struct ast_bridge *bridge = bridge_channel->bridge;
if (bridge->dissolved) {
return;
}
if (!bridge->num_channels
&& ast_test_flag(&bridge->feature_flags, AST_BRIDGE_FLAG_DISSOLVE_EMPTY)) {
/* Last channel leaving the bridge turns off the lights. */
bridge_dissolve(bridge, ast_channel_hangupcause(bridge_channel->chan));
return;
}
switch (bridge_channel->state) {
case BRIDGE_CHANNEL_STATE_END:
/* Do we need to dissolve the bridge because this channel hung up? */
if (ast_test_flag(&bridge->feature_flags, AST_BRIDGE_FLAG_DISSOLVE_HANGUP)
|| (bridge_channel->features->usable
&& ast_test_flag(&bridge_channel->features->feature_flags,
AST_BRIDGE_CHANNEL_FLAG_DISSOLVE_HANGUP))) {
bridge_dissolve(bridge, ast_channel_hangupcause(bridge_channel->chan));
return;
}
break;
default:
break;
}
if (bridge->num_lonely && bridge->num_lonely == bridge->num_channels) {
/*
* This will start a chain reaction where each channel leaving
* enters this function and causes the next to leave as long as
* there aren't non-lonely channels in the bridge.
*/
ast_bridge_channel_leave_bridge(AST_LIST_FIRST(&bridge->channels),
BRIDGE_CHANNEL_STATE_END_NO_DISSOLVE,
ast_channel_hangupcause(bridge_channel->chan));
}
}
void bridge_channel_internal_pull(struct ast_bridge_channel *bridge_channel)
{
struct ast_bridge *bridge = bridge_channel->bridge;
if (!bridge_channel->in_bridge) {
return;
}
bridge_channel->in_bridge = 0;
ast_debug(1, "Bridge %s: pulling %p(%s)\n",
bridge->uniqueid, bridge_channel, ast_channel_name(bridge_channel->chan));
ast_verb(3, "Channel %s left '%s' %s-bridge <%s>\n",
ast_channel_name(bridge_channel->chan),
bridge->technology->name,
bridge->v_table->name,
bridge->uniqueid);
if (!bridge_channel->just_joined) {
/* Tell the bridge technology we are leaving so they tear us down */
ast_debug(1, "Bridge %s: %p(%s) is leaving %s technology\n",
bridge->uniqueid, bridge_channel, ast_channel_name(bridge_channel->chan),
bridge->technology->name);
if (bridge->technology->leave) {
bridge->technology->leave(bridge, bridge_channel);
}
}
/* Remove channel from the bridge */
if (!bridge_channel->suspended) {
--bridge->num_active;
}
if (ast_test_flag(&bridge_channel->features->feature_flags, AST_BRIDGE_CHANNEL_FLAG_LONELY)) {
--bridge->num_lonely;
}
--bridge->num_channels;
AST_LIST_REMOVE(&bridge->channels, bridge_channel, entry);
bridge_channel_dissolve_check(bridge_channel);
bridge->v_table->pull(bridge, bridge_channel);
ast_bridge_channel_clear_roles(bridge_channel);
/* If we are not going to be hung up after leaving a bridge, and we were an
* outgoing channel, clear the outgoing flag.
*/
if (ast_test_flag(ast_channel_flags(bridge_channel->chan), AST_FLAG_OUTGOING)
&& (ast_channel_is_leaving_bridge(bridge_channel->chan)
|| bridge_channel->state == BRIDGE_CHANNEL_STATE_WAIT)) {
ast_debug(2, "Channel %s will survive this bridge; clearing outgoing (dialed) flag\n", ast_channel_name(bridge_channel->chan));
ast_channel_clear_flag(bridge_channel->chan, AST_FLAG_OUTGOING);
}
bridge->reconfigured = 1;
ast_bridge_publish_leave(bridge, bridge_channel->chan);
}
int bridge_channel_internal_push_full(struct ast_bridge_channel *bridge_channel, int optimized)
{
struct ast_bridge *bridge = bridge_channel->bridge;
struct ast_bridge_channel *swap;
ast_assert(!bridge_channel->in_bridge);
swap = bridge_find_channel(bridge, bridge_channel->swap);
bridge_channel->swap = NULL;
if (swap) {
ast_debug(1, "Bridge %s: pushing %p(%s) by swapping with %p(%s)\n",
bridge->uniqueid, bridge_channel, ast_channel_name(bridge_channel->chan),
swap, ast_channel_name(swap->chan));
} else {
ast_debug(1, "Bridge %s: pushing %p(%s)\n",
bridge->uniqueid, bridge_channel, ast_channel_name(bridge_channel->chan));
}
/* Add channel to the bridge */
if (bridge->dissolved
|| bridge_channel->state != BRIDGE_CHANNEL_STATE_WAIT
|| (swap && swap->state != BRIDGE_CHANNEL_STATE_WAIT)
|| bridge->v_table->push(bridge, bridge_channel, swap)) {
ast_debug(1, "Bridge %s: pushing %p(%s) into bridge failed\n",
bridge->uniqueid, bridge_channel, ast_channel_name(bridge_channel->chan));
return -1;
}
ast_bridge_channel_establish_roles(bridge_channel);
if (swap) {
int dissolve = ast_test_flag(&bridge->feature_flags, AST_BRIDGE_FLAG_DISSOLVE_EMPTY);
/* This flag is cleared so the act of this channel leaving does not cause it to dissolve if need be */
ast_clear_flag(&bridge->feature_flags, AST_BRIDGE_FLAG_DISSOLVE_EMPTY);
if (optimized) {
bridge_channel_cancel_owed_events(swap);
}
ast_bridge_channel_leave_bridge(swap, BRIDGE_CHANNEL_STATE_END_NO_DISSOLVE, 0);
bridge_channel_internal_pull(swap);
ast_set2_flag(&bridge->feature_flags, dissolve, AST_BRIDGE_FLAG_DISSOLVE_EMPTY);
}
bridge_channel->in_bridge = 1;
bridge_channel->just_joined = 1;
AST_LIST_INSERT_TAIL(&bridge->channels, bridge_channel, entry);
++bridge->num_channels;
if (ast_test_flag(&bridge_channel->features->feature_flags, AST_BRIDGE_CHANNEL_FLAG_LONELY)) {
++bridge->num_lonely;
}
if (!bridge_channel->suspended) {
++bridge->num_active;
}
ast_verb(3, "Channel %s %s%s%s '%s' %s-bridge <%s>\n",
ast_channel_name(bridge_channel->chan),
swap ? "swapped with " : "joined",
swap ? ast_channel_name(swap->chan) : "",
swap ? " into" : "",
bridge->technology->name,
bridge->v_table->name,
bridge->uniqueid);
ast_bridge_publish_enter(bridge, bridge_channel->chan, swap ? swap->chan : NULL);
/* Clear any BLINDTRANSFER,ATTENDEDTRANSFER and FORWARDERNAME since the transfer has completed. */
pbx_builtin_setvar_helper(bridge_channel->chan, "BLINDTRANSFER", NULL);
pbx_builtin_setvar_helper(bridge_channel->chan, "ATTENDEDTRANSFER", NULL);
pbx_builtin_setvar_helper(bridge_channel->chan, "FORWARDERNAME", NULL);
/* Wake up the bridge channel thread to reevaluate any interval timers. */
ast_queue_frame(bridge_channel->chan, &ast_null_frame);
bridge->reconfigured = 1;
return 0;
}
int bridge_channel_internal_push(struct ast_bridge_channel *bridge_channel)
{
return bridge_channel_internal_push_full(bridge_channel, 0);
}
/*!
* \internal
* \brief Handle bridge channel control frame action.
* \since 12.0.0
*
* \param bridge_channel Channel to execute the control frame action on.
* \param fr Control frame to handle.
*/
static void bridge_channel_handle_control(struct ast_bridge_channel *bridge_channel, struct ast_frame *fr)
{
struct ast_channel *chan;
struct ast_option_header *aoh;
int is_caller;
chan = bridge_channel->chan;
switch (fr->subclass.integer) {
case AST_CONTROL_REDIRECTING:
is_caller = !ast_test_flag(ast_channel_flags(chan), AST_FLAG_OUTGOING);
if (ast_channel_redirecting_sub(NULL, chan, fr, 1) &&
ast_channel_redirecting_macro(NULL, chan, fr, is_caller, 1)) {
ast_indicate_data(chan, fr->subclass.integer, fr->data.ptr, fr->datalen);
}
break;
case AST_CONTROL_CONNECTED_LINE:
is_caller = !ast_test_flag(ast_channel_flags(chan), AST_FLAG_OUTGOING);
if (ast_channel_connected_line_sub(NULL, chan, fr, 1) &&
ast_channel_connected_line_macro(NULL, chan, fr, is_caller, 1)) {
ast_indicate_data(chan, fr->subclass.integer, fr->data.ptr, fr->datalen);
}
break;
case AST_CONTROL_OPTION:
/*
* Forward option Requests, but only ones we know are safe These
* are ONLY sent by chan_iax2 and I'm not convinced that they
* are useful. I haven't deleted them entirely because I just am
* not sure of the ramifications of removing them.
*/
aoh = fr->data.ptr;
if (aoh && aoh->flag == AST_OPTION_FLAG_REQUEST) {
switch (ntohs(aoh->option)) {
case AST_OPTION_TONE_VERIFY:
case AST_OPTION_TDD:
case AST_OPTION_RELAXDTMF:
case AST_OPTION_AUDIO_MODE:
case AST_OPTION_DIGIT_DETECT:
case AST_OPTION_FAX_DETECT:
ast_channel_setoption(chan, ntohs(aoh->option), aoh->data,
fr->datalen - sizeof(*aoh), 0);
break;
default:
break;
}
}
break;
case AST_CONTROL_ANSWER:
if (ast_channel_state(chan) != AST_STATE_UP) {
ast_answer(chan);
ast_bridge_channel_lock_bridge(bridge_channel);
bridge_channel->bridge->reconfigured = 1;
bridge_reconfigured(bridge_channel->bridge, 0);
ast_bridge_unlock(bridge_channel->bridge);
} else {
ast_indicate(chan, -1);
}
break;
case AST_CONTROL_MASQUERADE_NOTIFY:
/* Should never happen. */
ast_assert(0);
break;
case AST_CONTROL_STREAM_TOPOLOGY_CHANGED:
ast_indicate_data(chan, fr->subclass.integer, fr->data.ptr, fr->datalen);
break;
default:
ast_indicate_data(chan, fr->subclass.integer, fr->data.ptr, fr->datalen);
break;
}
}
/*!
* \internal
* \brief Ensure text data is zero terminated before sending
*
* \param chan Channel to send text to
* \param f The frame containing the text data to send
*/
static void sendtext_safe(struct ast_channel *chan, const struct ast_frame *f)
{
if (f->datalen) {
char *text = f->data.ptr;
if (text[f->datalen - 1]) {
/* Not zero terminated, we need to allocate */
text = ast_strndup(text, f->datalen);
if (!text) {
return;
}
}
ast_sendtext(chan, text);
if (text != f->data.ptr) {
/* Only free if we allocated */
ast_free(text);
}
} else {
/* Special case if the frame length is zero (although I
* am not sure this is possible?) */
ast_sendtext(chan, "");
}
}
/*!
* \internal
* \brief Handle bridge channel write frame to channel.
* \since 12.0.0
*
* \param bridge_channel Channel to write outgoing frame.
*/
static void bridge_channel_handle_write(struct ast_bridge_channel *bridge_channel)
{
struct ast_frame *fr;
struct sync_payload *sync_payload;
int num;
struct ast_msg_data *msg;
ast_bridge_channel_lock(bridge_channel);
/* It's not good to have unbalanced frames and alert_pipe alerts. */
ast_assert(!AST_LIST_EMPTY(&bridge_channel->wr_queue));
if (AST_LIST_EMPTY(&bridge_channel->wr_queue)) {
/* No frame, flush the alert pipe of excess alerts. */
ast_log(LOG_WARNING, "Weird. No frame from bridge for %s to process?\n",
ast_channel_name(bridge_channel->chan));
ast_alertpipe_read(bridge_channel->alert_pipe);
ast_bridge_channel_unlock(bridge_channel);
return;
}
AST_LIST_TRAVERSE_SAFE_BEGIN(&bridge_channel->wr_queue, fr, frame_list) {
if (bridge_channel->dtmf_hook_state.collected[0]) {
switch (fr->frametype) {
case AST_FRAME_BRIDGE_ACTION:
case AST_FRAME_BRIDGE_ACTION_SYNC:
/* Defer processing these frames while DTMF is collected. */
continue;
default:
break;
}
}
ast_alertpipe_read(bridge_channel->alert_pipe);
AST_LIST_REMOVE_CURRENT(frame_list);
break;
}
AST_LIST_TRAVERSE_SAFE_END;
ast_bridge_channel_unlock(bridge_channel);
if (!fr) {
/*
* Wait some to reduce CPU usage from a tight loop
* without any wait because we only have deferred
* frames in the wr_queue.
*/
usleep(1);
return;
}
switch (fr->frametype) {
case AST_FRAME_BRIDGE_ACTION:
bridge_channel_handle_action(bridge_channel, fr->subclass.integer, fr->data.ptr);
break;
case AST_FRAME_BRIDGE_ACTION_SYNC:
sync_payload = fr->data.ptr;
bridge_channel_handle_action(bridge_channel, fr->subclass.integer, sync_payload->data);
break;
case AST_FRAME_CONTROL:
bridge_channel_handle_control(bridge_channel, fr);
break;
case AST_FRAME_NULL:
break;
case AST_FRAME_TEXT:
ast_debug(1, "Sending TEXT frame to '%s': %*.s\n",
ast_channel_name(bridge_channel->chan), fr->datalen, (char *)fr->data.ptr);
sendtext_safe(bridge_channel->chan, fr);
break;
case AST_FRAME_TEXT_DATA:
msg = (struct ast_msg_data *)fr->data.ptr;
ast_debug(1, "Sending TEXT_DATA frame from '%s' to '%s:%s': %s\n",
ast_msg_data_get_attribute(msg, AST_MSG_DATA_ATTR_FROM),
ast_msg_data_get_attribute(msg, AST_MSG_DATA_ATTR_TO),
ast_channel_name(bridge_channel->chan),
ast_msg_data_get_attribute(msg, AST_MSG_DATA_ATTR_BODY));
ast_sendtext_data(bridge_channel->chan, msg);
break;
default:
/* Assume that there is no mapped stream for this */
num = -1;
if (fr->stream_num > -1) {
ast_bridge_channel_lock(bridge_channel);
if (fr->stream_num < (int)AST_VECTOR_SIZE(&bridge_channel->stream_map.to_channel)) {
num = AST_VECTOR_GET(&bridge_channel->stream_map.to_channel, fr->stream_num);
}
ast_bridge_channel_unlock(bridge_channel);
/* If there is no mapped stream after checking the mapping then there is nowhere
* to write this frame to, so drop it.
*/
if (num == -1) {
break;
}
}
/* Write the frame to the channel. */
bridge_channel->activity = BRIDGE_CHANNEL_THREAD_SIMPLE;
ast_write_stream(bridge_channel->chan, num, fr);
break;
}
bridge_frame_free(fr);
}
/*!
* \internal
* \brief Handle DTMF from a channel
*/
static struct ast_frame *bridge_handle_dtmf(struct ast_bridge_channel *bridge_channel, struct ast_frame *frame)
{
struct ast_bridge_features *features = bridge_channel->features;
struct ast_bridge_hook_dtmf *hook = NULL;
char dtmf[2];
/*
* See if we are already matching a DTMF feature hook sequence or
* if this DTMF matches the beginning of any DTMF feature hooks.
*/
dtmf[0] = frame->subclass.integer;
dtmf[1] = '\0';
if (bridge_channel->dtmf_hook_state.collected[0]
|| (hook = ao2_find(features->dtmf_hooks, dtmf, OBJ_SEARCH_PARTIAL_KEY))) {
enum ast_frame_type frametype = frame->frametype;
bridge_frame_free(frame);
frame = NULL;
ao2_cleanup(hook);
switch (frametype) {
case AST_FRAME_DTMF_BEGIN:
/* Just eat the frame. */
break;
case AST_FRAME_DTMF_END:
ast_bridge_channel_feature_digit(bridge_channel, dtmf[0]);
break;
default:
/* Unexpected frame type. */
ast_assert(0);
break;
}
#ifdef TEST_FRAMEWORK
} else if (frame->frametype == AST_FRAME_DTMF_END) {
/* Only transmit this event on DTMF end or else every DTMF
* press will result in the event being broadcast twice
*/
ast_test_suite_event_notify("FEATURE_DETECTION", "Result: fail");
#endif
}
return frame;
}
static const char *controls[] = {
[AST_CONTROL_RINGING] = "RINGING",
[AST_CONTROL_PROCEEDING] = "PROCEEDING",
[AST_CONTROL_PROGRESS] = "PROGRESS",
[AST_CONTROL_BUSY] = "BUSY",
[AST_CONTROL_CONGESTION] = "CONGESTION",
[AST_CONTROL_ANSWER] = "ANSWER",
};
/*!
* \internal
* \brief Feed notification that a frame is waiting on a channel into the bridging core
*
* \param bridge_channel Bridge channel the notification was received on
*/
static void bridge_handle_trip(struct ast_bridge_channel *bridge_channel)
{
struct ast_frame *frame;
int blocked;
if (!ast_strlen_zero(ast_channel_call_forward(bridge_channel->chan))) {
/* TODO If early bridging is ever used by anything other than ARI,
* it's important that we actually attempt to handle the call forward
* attempt, as well as expand features on a bridge channel to allow/disallow
* call forwarding. For now, all we do is raise an event, showing that
* a call forward is being attempted.
*/
ast_channel_publish_dial_forward(NULL, bridge_channel->chan, NULL, NULL, "CANCEL",
ast_channel_call_forward(bridge_channel->chan));
}
if (bridge_channel->features->mute) {
frame = ast_read_stream_noaudio(bridge_channel->chan);
} else {
frame = ast_read_stream(bridge_channel->chan);
}
if (!frame) {
ast_bridge_channel_kick(bridge_channel, 0);
return;
}
if (!ast_channel_is_multistream(bridge_channel->chan)) {
/* This may not be initialized by non-multistream channel drivers */
frame->stream_num = -1;
}
switch (frame->frametype) {
case AST_FRAME_CONTROL:
switch (frame->subclass.integer) {
case AST_CONTROL_CONGESTION:
case AST_CONTROL_BUSY:
ast_channel_publish_dial(NULL, bridge_channel->chan, NULL, controls[frame->subclass.integer]);
break;
case AST_CONTROL_HANGUP:
ast_bridge_channel_kick(bridge_channel, 0);
bridge_frame_free(frame);
return;
case AST_CONTROL_RINGING:
case AST_CONTROL_PROGRESS:
case AST_CONTROL_PROCEEDING:
case AST_CONTROL_ANSWER:
ast_channel_publish_dial(NULL, bridge_channel->chan, NULL, controls[frame->subclass.integer]);
break;
case AST_CONTROL_STREAM_TOPOLOGY_REQUEST_CHANGE:
ast_bridge_channel_lock_bridge(bridge_channel);
blocked = bridge_channel->bridge->technology->stream_topology_request_change
&& bridge_channel->bridge->technology->stream_topology_request_change(
bridge_channel->bridge, bridge_channel);
ast_bridge_unlock(bridge_channel->bridge);
if (blocked) {
/*
* Topology change was intercepted by the bridge technology
* so drop frame.
*/
bridge_frame_free(frame);
return;
}
break;
case AST_CONTROL_STREAM_TOPOLOGY_CHANGED:
/*
* If a stream topology has changed then the bridge_channel's
* media mapping needs to be updated.
*/
ast_bridge_channel_lock_bridge(bridge_channel);
if (bridge_channel->bridge->technology->stream_topology_changed) {
bridge_channel->bridge->technology->stream_topology_changed(
bridge_channel->bridge, bridge_channel);
} else {
ast_bridge_channel_stream_map(bridge_channel);
}
ast_bridge_unlock(bridge_channel->bridge);
break;
default:
break;
}
break;
case AST_FRAME_DTMF_BEGIN:
case AST_FRAME_DTMF_END:
frame = bridge_handle_dtmf(bridge_channel, frame);
if (!frame) {
return;
}
if (!bridge_channel->features->dtmf_passthrough) {
bridge_frame_free(frame);
return;
}
break;
default:
break;
}
/* Simply write the frame out to the bridge technology. */
bridge_channel_write_frame(bridge_channel, frame);
bridge_frame_free(frame);
}
/*!
* \internal
* \brief Determine how long till the next timer interval.
* \since 12.0.0
*
* \param bridge_channel Channel to determine how long can wait.
*
* \retval ms Number of milliseconds to wait.
* \retval -1 to wait forever.
*/
static int bridge_channel_next_interval(struct ast_bridge_channel *bridge_channel)
{
struct ast_heap *interval_hooks = bridge_channel->features->interval_hooks;
struct ast_bridge_hook_timer *hook;
int ms;
ast_heap_wrlock(interval_hooks);
hook = ast_heap_peek(interval_hooks, 1);
if (hook) {
ms = ast_tvdiff_ms(hook->timer.trip_time, ast_tvnow());
if (ms < 0) {
/* Expire immediately. An interval hook is ready to run. */
ms = 0;
}
} else {
/* No hook so wait forever. */
ms = -1;
}
ast_heap_unlock(interval_hooks);
return ms;
}
/*!
* \internal
* \brief Determine how long till the DTMF interdigit timeout.
* \since 12.8.0
*
* \param bridge_channel Channel to determine how long can wait.
*
* \retval ms Number of milliseconds to wait.
* \retval -1 to wait forever.
*/
static int bridge_channel_feature_timeout(struct ast_bridge_channel *bridge_channel)
{
int ms;
if (bridge_channel->dtmf_hook_state.collected[0]) {
ms = ast_tvdiff_ms(bridge_channel->dtmf_hook_state.interdigit_timeout,
ast_tvnow());
if (ms < 0) {
/* Expire immediately. */
ms = 0;
}
} else {
/* Timer is not active so wait forever. */
ms = -1;
}
return ms;
}
/*!
* \internal
* \brief Determine how long till a timeout.
* \since 12.8.0
*
* \param bridge_channel Channel to determine how long can wait.
*
* \retval ms Number of milliseconds to wait.
* \retval -1 to wait forever.
*/
static int bridge_channel_next_timeout(struct ast_bridge_channel *bridge_channel)
{
int ms_interval;
int ms;
ms_interval = bridge_channel_next_interval(bridge_channel);
ms = bridge_channel_feature_timeout(bridge_channel);
if (ms < 0 || (0 <= ms_interval && ms_interval < ms)) {
/* Interval hook timeout is next. */
ms = ms_interval;
}
return ms;
}
/*!
* \internal
* \brief Wait for something to happen on the bridge channel and handle it.
* \since 12.0.0
*
* \param bridge_channel Channel to wait.
*
* \note Each channel does writing/reading in their own thread.
*/
static void bridge_channel_wait(struct ast_bridge_channel *bridge_channel)
{
int ms;
int outfd;
struct ast_channel *chan;
/* Wait for data to either come from the channel or us to be signaled */
ast_bridge_channel_lock(bridge_channel);
if (bridge_channel->state != BRIDGE_CHANNEL_STATE_WAIT) {
} else if (bridge_channel->suspended) {
/* XXX ASTERISK-21271 the external party use of suspended will go away as will these references because this is the bridge channel thread */
ast_debug(1, "Bridge %s: %p(%s) is going into a signal wait\n",
bridge_channel->bridge->uniqueid, bridge_channel,
ast_channel_name(bridge_channel->chan));
ast_cond_wait(&bridge_channel->cond, ao2_object_get_lockaddr(bridge_channel));
} else {
ast_bridge_channel_unlock(bridge_channel);
outfd = -1;
ms = bridge_channel_next_timeout(bridge_channel);
chan = ast_waitfor_nandfds(&bridge_channel->chan, 1,
&bridge_channel->alert_pipe[0], 1, NULL, &outfd, &ms);
if (ast_channel_unbridged(bridge_channel->chan)) {
ast_channel_set_unbridged(bridge_channel->chan, 0);
ast_bridge_channel_lock_bridge(bridge_channel);
bridge_channel->bridge->reconfigured = 1;
bridge_reconfigured(bridge_channel->bridge, 0);
ast_bridge_unlock(bridge_channel->bridge);
}
ast_bridge_channel_lock(bridge_channel);
bridge_channel->activity = BRIDGE_CHANNEL_THREAD_FRAME;
ast_bridge_channel_unlock(bridge_channel);
if (!bridge_channel->suspended
&& bridge_channel->state == BRIDGE_CHANNEL_STATE_WAIT) {
if (chan) {
bridge_handle_trip(bridge_channel);
} else if (ms == 0) {
/* An interdigit timeout or interval expired. */
bridge_channel_handle_feature_timeout(bridge_channel);
bridge_channel_handle_interval(bridge_channel);
} else if (-1 < outfd) {
/*
* Must do this after checking timeouts or may have
* an infinite loop due to deferring write queue
* actions while trying to match DTMF feature hooks.
*/
bridge_channel_handle_write(bridge_channel);
}
}
bridge_channel->activity = BRIDGE_CHANNEL_THREAD_IDLE;
return;
}
ast_bridge_channel_unlock(bridge_channel);
}
/*!
* \internal
* \brief Handle bridge channel join/leave event.
* \since 12.0.0
*
* \param bridge_channel Which channel is involved.
* \param type Specified join/leave event.
*/
static void bridge_channel_event_join_leave(struct ast_bridge_channel *bridge_channel, enum ast_bridge_hook_type type)
{
struct ast_bridge_features *features = bridge_channel->features;
struct ast_bridge_hook *hook;
struct ao2_iterator iter;
/* Run the specified hooks. */
iter = ao2_iterator_init(features->other_hooks, 0);
for (; (hook = ao2_iterator_next(&iter)); ao2_ref(hook, -1)) {
if (hook->type == type) {
break;
}
}
if (hook) {
/* Found the first specified hook to run. */
bridge_channel_suspend(bridge_channel);
ast_indicate(bridge_channel->chan, AST_CONTROL_SRCUPDATE);
do {
if (hook->type == type) {
hook->callback(bridge_channel, hook->hook_pvt);
ao2_unlink(features->other_hooks, hook);
}
ao2_ref(hook, -1);
} while ((hook = ao2_iterator_next(&iter)));
ast_indicate(bridge_channel->chan, AST_CONTROL_SRCUPDATE);
bridge_channel_unsuspend(bridge_channel);
}
ao2_iterator_destroy(&iter);
}
int bridge_channel_internal_join(struct ast_bridge_channel *bridge_channel)
{
int res = 0;
uint8_t indicate_src_change = 0;
struct ast_bridge_features *channel_features;
struct ast_channel *peer;
struct ast_channel *swap;
ast_debug(1, "Bridge %s: %p(%s) is joining\n",
bridge_channel->bridge->uniqueid,
bridge_channel, ast_channel_name(bridge_channel->chan));
/*
* Directly locking the bridge is safe here because nobody else
* knows about this bridge_channel yet.
*/
ast_bridge_lock(bridge_channel->bridge);
ast_channel_lock(bridge_channel->chan);
peer = ast_local_get_peer(bridge_channel->chan);
if (peer) {
struct ast_bridge *peer_bridge;
ast_channel_unlock(bridge_channel->chan);
ast_channel_lock(peer);
peer_bridge = ast_channel_internal_bridge(peer);
ast_channel_unlock(peer);
ast_channel_unref(peer);
/* As we are only doing a pointer comparison we don't need the peer_bridge
* to be reference counted or locked.
*/
if (peer_bridge == bridge_channel->bridge) {
ast_bridge_unlock(bridge_channel->bridge);
ast_debug(1, "Bridge %s: %p(%s) denying Bridge join to prevent Local channel loop\n",
bridge_channel->bridge->uniqueid,
bridge_channel,
ast_channel_name(bridge_channel->chan));
return -1;
}
ast_channel_lock(bridge_channel->chan);
}
bridge_channel->read_format = ao2_bump(ast_channel_readformat(bridge_channel->chan));
bridge_channel->write_format = ao2_bump(ast_channel_writeformat(bridge_channel->chan));
/* Make sure we're still good to be put into a bridge */
if (ast_channel_internal_bridge(bridge_channel->chan)
|| ast_test_flag(ast_channel_flags(bridge_channel->chan), AST_FLAG_ZOMBIE)) {
ast_channel_unlock(bridge_channel->chan);
ast_bridge_unlock(bridge_channel->bridge);
ast_debug(1, "Bridge %s: %p(%s) failed to join Bridge\n",
bridge_channel->bridge->uniqueid,
bridge_channel,
ast_channel_name(bridge_channel->chan));
return -1;
}
ast_channel_internal_bridge_set(bridge_channel->chan, bridge_channel->bridge);
/* Attach features requested by the channel */
channel_features = ast_channel_feature_hooks_get(bridge_channel->chan);
if (channel_features) {
ast_bridge_features_merge(bridge_channel->features, channel_features);
}
ast_channel_unlock(bridge_channel->chan);
/* Add the jitterbuffer if the channel requires it */
ast_jb_enable_for_channel(bridge_channel->chan);
if (!bridge_channel->bridge->callid) {
bridge_channel->bridge->callid = ast_read_threadstorage_callid();
}
/* Take the swap channel ref from the bridge_channel struct. */
swap = bridge_channel->swap;
if (bridge_channel_internal_push(bridge_channel)) {
int cause = bridge_channel->bridge->cause;
ast_bridge_unlock(bridge_channel->bridge);
ast_bridge_channel_kick(bridge_channel, cause);
ast_bridge_channel_lock_bridge(bridge_channel);
ast_bridge_features_remove(bridge_channel->features,
AST_BRIDGE_HOOK_REMOVE_ON_PULL);
bridge_channel_dissolve_check(bridge_channel);
res = -1;
}
bridge_reconfigured(bridge_channel->bridge, !bridge_channel->inhibit_colp);
if (bridge_channel->state == BRIDGE_CHANNEL_STATE_WAIT) {
/*
* Indicate a source change since this channel is entering the
* bridge system only if the bridge technology is not MULTIMIX
* capable. The MULTIMIX technology has already done it.
*/
if (!(bridge_channel->bridge->technology->capabilities
& AST_BRIDGE_CAPABILITY_MULTIMIX)) {
indicate_src_change = 1;
}
bridge_channel_impart_signal(bridge_channel->chan);
ast_bridge_unlock(bridge_channel->bridge);
/* Must release any swap ref after unlocking the bridge. */
ao2_t_cleanup(swap, "Bridge push with swap successful");
swap = NULL;
if (indicate_src_change) {
ast_indicate(bridge_channel->chan, AST_CONTROL_SRCCHANGE);
}
bridge_channel_event_join_leave(bridge_channel, AST_BRIDGE_HOOK_TYPE_JOIN);
while (bridge_channel->state == BRIDGE_CHANNEL_STATE_WAIT) {
/* Wait for something to do. */
bridge_channel_wait(bridge_channel);
}
/* Force a timeout on any accumulated DTMF hook digits. */
ast_bridge_channel_feature_digit(bridge_channel, 0);
bridge_channel_event_join_leave(bridge_channel, AST_BRIDGE_HOOK_TYPE_LEAVE);
ast_bridge_channel_lock_bridge(bridge_channel);
}
bridge_channel_internal_pull(bridge_channel);
bridge_channel_settle_owed_events(bridge_channel->bridge, bridge_channel);
bridge_reconfigured(bridge_channel->bridge, 1);
/* Remove ourselves if we are the video source */
ast_bridge_remove_video_src(bridge_channel->bridge, bridge_channel->chan);
ast_bridge_unlock(bridge_channel->bridge);
/* Must release any swap ref after unlocking the bridge. */
ao2_t_cleanup(swap, "Bridge push with swap failed or exited immediately");
/* Complete any active hold before exiting the bridge. */
if (ast_channel_hold_state(bridge_channel->chan) == AST_CONTROL_HOLD) {
ast_debug(1, "Channel %s simulating UNHOLD for bridge end.\n",
ast_channel_name(bridge_channel->chan));
ast_indicate(bridge_channel->chan, AST_CONTROL_UNHOLD);
}
/* Complete any partial DTMF digit before exiting the bridge. */
if (ast_channel_sending_dtmf_digit(bridge_channel->chan)) {
ast_channel_end_dtmf(bridge_channel->chan,
ast_channel_sending_dtmf_digit(bridge_channel->chan),
ast_channel_sending_dtmf_tv(bridge_channel->chan), "bridge end");
}
/* Complete any T.38 session before exiting the bridge. */
if (ast_channel_is_t38_active(bridge_channel->chan)) {
struct ast_control_t38_parameters t38_parameters = {
.request_response = AST_T38_TERMINATED,
};
ast_debug(1, "Channel %s simulating T.38 terminate for bridge end.\n",
ast_channel_name(bridge_channel->chan));
ast_indicate_data(bridge_channel->chan, AST_CONTROL_T38_PARAMETERS,
&t38_parameters, sizeof(t38_parameters));
}
/* Indicate a source change since this channel is leaving the bridge system. */
ast_indicate(bridge_channel->chan, AST_CONTROL_SRCCHANGE);
/*
* Wait for any dual redirect to complete.
*
* Must be done while "still in the bridge" for ast_async_goto()
* to work right.
*/
while (ast_test_flag(ast_channel_flags(bridge_channel->chan), AST_FLAG_BRIDGE_DUAL_REDIRECT_WAIT)) {
sched_yield();
}
ast_channel_lock(bridge_channel->chan);
ast_channel_internal_bridge_set(bridge_channel->chan, NULL);
ast_channel_unlock(bridge_channel->chan);
ast_bridge_channel_restore_formats(bridge_channel);
return res;
}
int bridge_channel_internal_queue_blind_transfer(struct ast_channel *transferee,
const char *exten, const char *context,
transfer_channel_cb new_channel_cb, void *user_data)
{
RAII_VAR(struct ast_bridge_channel *, transferee_bridge_channel, NULL, ao2_cleanup);
struct blind_transfer_data blind_data;
ast_channel_lock(transferee);
transferee_bridge_channel = ast_channel_get_bridge_channel(transferee);
ast_channel_unlock(transferee);
if (!transferee_bridge_channel) {
return -1;
}
if (new_channel_cb) {
new_channel_cb(transferee, user_data, AST_BRIDGE_TRANSFER_SINGLE_PARTY);
}
ast_copy_string(blind_data.exten, exten, sizeof(blind_data.exten));
ast_copy_string(blind_data.context, context, sizeof(blind_data.context));
return bridge_channel_queue_action_data(transferee_bridge_channel,
BRIDGE_CHANNEL_ACTION_BLIND_TRANSFER, &blind_data, sizeof(blind_data));
}
int bridge_channel_internal_queue_attended_transfer(struct ast_channel *transferee,
struct ast_channel *unbridged_chan)
{
RAII_VAR(struct ast_bridge_channel *, transferee_bridge_channel, NULL, ao2_cleanup);
char unbridged_chan_name[AST_CHANNEL_NAME];
ast_channel_lock(transferee);
transferee_bridge_channel = ast_channel_get_bridge_channel(transferee);
ast_channel_unlock(transferee);
if (!transferee_bridge_channel) {
return -1;
}
ast_copy_string(unbridged_chan_name, ast_channel_name(unbridged_chan),
sizeof(unbridged_chan_name));
return bridge_channel_queue_action_data(transferee_bridge_channel,
BRIDGE_CHANNEL_ACTION_ATTENDED_TRANSFER, unbridged_chan_name,
sizeof(unbridged_chan_name));
}
int bridge_channel_internal_allows_optimization(struct ast_bridge_channel *bridge_channel)
{
return bridge_channel->in_bridge
&& AST_LIST_EMPTY(&bridge_channel->wr_queue);
}
/* Destroy elements of the bridge channel structure and the bridge channel structure itself */
static void bridge_channel_destroy(void *obj)
{
struct ast_bridge_channel *bridge_channel = obj;
struct ast_frame *fr;
if (bridge_channel->callid) {
bridge_channel->callid = 0;
}
if (bridge_channel->bridge) {
ao2_ref(bridge_channel->bridge, -1);
bridge_channel->bridge = NULL;
}
/* Flush any unhandled wr_queue frames. */
while ((fr = AST_LIST_REMOVE_HEAD(&bridge_channel->wr_queue, frame_list))) {
bridge_frame_free(fr);
}
ast_alertpipe_close(bridge_channel->alert_pipe);
/* Flush any unhandled deferred_queue frames. */
while ((fr = AST_LIST_REMOVE_HEAD(&bridge_channel->deferred_queue, frame_list))) {
ast_frfree(fr);
}
ast_cond_destroy(&bridge_channel->cond);
ao2_cleanup(bridge_channel->write_format);
ao2_cleanup(bridge_channel->read_format);
AST_VECTOR_FREE(&bridge_channel->stream_map.to_bridge);
AST_VECTOR_FREE(&bridge_channel->stream_map.to_channel);
}
struct ast_bridge_channel *bridge_channel_internal_alloc(struct ast_bridge *bridge)
{
struct ast_bridge_channel *bridge_channel;
bridge_channel = ao2_alloc(sizeof(struct ast_bridge_channel), bridge_channel_destroy);
if (!bridge_channel) {
return NULL;
}
ast_cond_init(&bridge_channel->cond, NULL);
if (ast_alertpipe_init(bridge_channel->alert_pipe)) {
ao2_ref(bridge_channel, -1);
return NULL;
}
if (bridge) {
bridge_channel->bridge = bridge;
ao2_ref(bridge_channel->bridge, +1);
}
/* The stream_map is initialized later - see ast_bridge_channel_stream_map */
return bridge_channel;
}
void ast_bridge_channel_stream_map(struct ast_bridge_channel *bridge_channel)
{
ast_bridge_channel_lock(bridge_channel);
ast_channel_lock(bridge_channel->chan);
ast_stream_topology_map(ast_channel_get_stream_topology(bridge_channel->chan),
&bridge_channel->bridge->media_types, &bridge_channel->stream_map.to_bridge,
&bridge_channel->stream_map.to_channel);
ast_channel_unlock(bridge_channel->chan);
ast_bridge_channel_unlock(bridge_channel);
}