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core_local.c
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/*
* Asterisk -- An open source telephony toolkit.
*
* Copyright (C) 2013 Digium, Inc.
*
* Richard Mudgett <[email protected]>
*
* 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 Local proxy channel driver.
*
* \author Richard Mudgett <[email protected]>
*
* See Also:
* \arg \ref AstCREDITS
*/
/*** MODULEINFO
<support_level>core</support_level>
***/
#include "asterisk.h"
/* ------------------------------------------------------------------- */
#include "asterisk/channel.h"
#include "asterisk/pbx.h"
#include "asterisk/cli.h"
#include "asterisk/manager.h"
#include "asterisk/devicestate.h"
#include "asterisk/astobj2.h"
#include "asterisk/bridge.h"
#include "asterisk/core_unreal.h"
#include "asterisk/core_local.h"
#include "asterisk/stasis.h"
#include "asterisk/stasis_channels.h"
#include "asterisk/_private.h"
#include "asterisk/stasis_channels.h"
#include "asterisk/stream.h"
#include "asterisk/translate.h"
/*** DOCUMENTATION
<manager name="LocalOptimizeAway" language="en_US">
<synopsis>
Optimize away a local channel when possible.
</synopsis>
<syntax>
<xi:include xpointer="xpointer(/docs/manager[@name='Login']/syntax/parameter[@name='ActionID'])" />
<parameter name="Channel" required="true">
<para>The channel name to optimize away.</para>
</parameter>
</syntax>
<description>
<para>A local channel created with "/n" will not automatically optimize away.
Calling this command on the local channel will clear that flag and allow
it to optimize away if it's bridged or when it becomes bridged.</para>
</description>
</manager>
<managerEvent language="en_US" name="LocalBridge">
<managerEventInstance class="EVENT_FLAG_CALL">
<synopsis>Raised when two halves of a Local Channel form a bridge.</synopsis>
<syntax>
<channel_snapshot prefix="LocalOne"/>
<channel_snapshot prefix="LocalTwo"/>
<parameter name="Context">
<para>The context in the dialplan that Channel2 starts in.</para>
</parameter>
<parameter name="Exten">
<para>The extension in the dialplan that Channel2 starts in.</para>
</parameter>
<parameter name="LocalOptimization">
<enumlist>
<enum name="Yes"/>
<enum name="No"/>
</enumlist>
</parameter>
</syntax>
</managerEventInstance>
</managerEvent>
<managerEvent language="en_US" name="LocalOptimizationBegin">
<managerEventInstance class="EVENT_FLAG_CALL">
<synopsis>Raised when two halves of a Local Channel begin to optimize
themselves out of the media path.</synopsis>
<syntax>
<channel_snapshot prefix="LocalOne"/>
<channel_snapshot prefix="LocalTwo"/>
<channel_snapshot prefix="Source"/>
<parameter name="DestUniqueId">
<para>The unique ID of the bridge into which the local channel is optimizing.</para>
</parameter>
<parameter name="Id">
<para>Identification for the optimization operation.</para>
</parameter>
</syntax>
<see-also>
<ref type="managerEvent">LocalOptimizationEnd</ref>
<ref type="manager">LocalOptimizeAway</ref>
</see-also>
</managerEventInstance>
</managerEvent>
<managerEvent language="en_US" name="LocalOptimizationEnd">
<managerEventInstance class="EVENT_FLAG_CALL">
<synopsis>Raised when two halves of a Local Channel have finished optimizing
themselves out of the media path.</synopsis>
<syntax>
<channel_snapshot prefix="LocalOne"/>
<channel_snapshot prefix="LocalTwo"/>
<parameter name="Success">
<para>Indicates whether the local optimization succeeded.</para>
</parameter>
<parameter name="Id">
<para>Identification for the optimization operation. Matches the <replaceable>Id</replaceable>
from a previous <literal>LocalOptimizationBegin</literal></para>
</parameter>
</syntax>
<see-also>
<ref type="managerEvent">LocalOptimizationBegin</ref>
<ref type="manager">LocalOptimizeAway</ref>
</see-also>
</managerEventInstance>
</managerEvent>
***/
static const char tdesc[] = "Local Proxy Channel Driver";
static struct ao2_container *locals;
static struct ast_channel *local_request(const char *type, struct ast_format_cap *cap, const struct ast_assigned_ids *assignedids, const struct ast_channel *requestor, const char *data, int *cause);
static struct ast_channel *local_request_with_stream_topology(const char *type, struct ast_stream_topology *topology, const struct ast_assigned_ids *assignedids, const struct ast_channel *requestor, const char *data, int *cause);
static int local_call(struct ast_channel *ast, const char *dest, int timeout);
static int local_hangup(struct ast_channel *ast);
static int local_devicestate(const char *data);
static void local_optimization_started_cb(struct ast_unreal_pvt *base, struct ast_channel *source,
enum ast_unreal_channel_indicator dest, unsigned int id);
static void local_optimization_finished_cb(struct ast_unreal_pvt *base, int success, unsigned int id);
static int local_setoption(struct ast_channel *chan, int option, void *data, int datalen);
static struct ast_manager_event_blob *local_message_to_ami(struct stasis_message *msg);
/*!
* @{ \brief Define local channel message types.
*/
STASIS_MESSAGE_TYPE_DEFN(ast_local_bridge_type,
.to_ami = local_message_to_ami,
);
STASIS_MESSAGE_TYPE_DEFN(ast_local_optimization_begin_type,
.to_ami = local_message_to_ami,
);
STASIS_MESSAGE_TYPE_DEFN(ast_local_optimization_end_type,
.to_ami = local_message_to_ami,
);
/*! @} */
/*! \brief Callbacks from the unreal core when channel optimization occurs */
struct ast_unreal_pvt_callbacks local_unreal_callbacks = {
.optimization_started = local_optimization_started_cb,
.optimization_finished = local_optimization_finished_cb,
};
/* PBX interface structure for channel registration */
static struct ast_channel_tech local_tech = {
.type = "Local",
.description = tdesc,
.requester = local_request,
.requester_with_stream_topology = local_request_with_stream_topology,
.send_digit_begin = ast_unreal_digit_begin,
.send_digit_end = ast_unreal_digit_end,
.call = local_call,
.hangup = local_hangup,
.answer = ast_unreal_answer,
.read_stream = ast_unreal_read,
.write = ast_unreal_write,
.write_stream = ast_unreal_write_stream,
.exception = ast_unreal_read,
.indicate = ast_unreal_indicate,
.fixup = ast_unreal_fixup,
.send_html = ast_unreal_sendhtml,
.send_text = ast_unreal_sendtext,
.devicestate = local_devicestate,
.queryoption = ast_unreal_queryoption,
.setoption = local_setoption,
};
/*! What to do with the ;2 channel when ast_call() happens. */
enum local_call_action {
/* The ast_call() will run dialplan on the ;2 channel. */
LOCAL_CALL_ACTION_DIALPLAN,
/* The ast_call() will impart the ;2 channel into a bridge. */
LOCAL_CALL_ACTION_BRIDGE,
/* The ast_call() will masquerade the ;2 channel into a channel. */
LOCAL_CALL_ACTION_MASQUERADE,
};
/*! Join a bridge on ast_call() parameters. */
struct local_bridge {
/*! Bridge to join. */
struct ast_bridge *join;
/*! Channel to swap with when joining bridge. */
struct ast_channel *swap;
/*! Features that are specific to this channel when pushed into the bridge. */
struct ast_bridge_features *features;
};
/*!
* \brief the local pvt structure for all channels
*
* The local channel pvt has two ast_chan objects - the "owner" and the "next channel", the outbound channel
*
* ast_chan owner -> local_pvt -> ast_chan chan
*/
struct local_pvt {
/*! Unreal channel driver base class values. */
struct ast_unreal_pvt base;
/*! Additional action arguments */
union {
/*! Make ;2 join a bridge on ast_call(). */
struct local_bridge bridge;
/*! Make ;2 masquerade into this channel on ast_call(). */
struct ast_channel *masq;
} action;
/*! What to do with the ;2 channel on ast_call(). */
enum local_call_action type;
/*! Context to call */
char context[AST_MAX_CONTEXT];
/*! Extension to call */
char exten[AST_MAX_EXTENSION];
};
void ast_local_lock_all(struct ast_channel *chan, void **tech_pvt,
struct ast_channel **base_chan, struct ast_channel **base_owner)
{
struct local_pvt *p = ast_channel_tech_pvt(chan);
*tech_pvt = NULL;
*base_chan = NULL;
*base_owner = NULL;
if (p) {
*tech_pvt = ao2_bump(p);
ast_unreal_lock_all(&p->base, base_chan, base_owner);
}
}
void ast_local_unlock_all(void *tech_pvt, struct ast_channel *base_chan,
struct ast_channel *base_owner)
{
if (base_chan) {
ast_channel_unlock(base_chan);
ast_channel_unref(base_chan);
}
if (base_owner) {
ast_channel_unlock(base_owner);
ast_channel_unref(base_owner);
}
if (tech_pvt) {
struct local_pvt *p = tech_pvt;
ao2_unlock(&p->base);
ao2_ref(tech_pvt, -1);
}
}
struct ast_channel *ast_local_get_peer(struct ast_channel *ast)
{
struct local_pvt *p = ast_channel_tech_pvt(ast);
struct local_pvt *found;
struct ast_channel *peer;
if (!p) {
return NULL;
}
found = p ? ao2_find(locals, p, 0) : NULL;
if (!found) {
/* ast is either not a local channel or it has alredy been hungup */
return NULL;
}
ao2_lock(found);
if (ast == p->base.owner) {
peer = p->base.chan;
} else if (ast == p->base.chan) {
peer = p->base.owner;
} else {
peer = NULL;
}
if (peer) {
ast_channel_ref(peer);
}
ao2_unlock(found);
ao2_ref(found, -1);
return peer;
}
/*! \brief Adds devicestate to local channels */
static int local_devicestate(const char *data)
{
int is_inuse = 0;
int res = AST_DEVICE_INVALID;
char *exten = ast_strdupa(data);
char *context;
char *opts;
struct local_pvt *lp;
struct ao2_iterator it;
/* Strip options if they exist */
opts = strchr(exten, '/');
if (opts) {
*opts = '\0';
}
context = strchr(exten, '@');
if (!context) {
ast_log(LOG_WARNING,
"Someone used Local/%s somewhere without a @context. This is bad.\n", data);
return AST_DEVICE_INVALID;
}
*context++ = '\0';
it = ao2_iterator_init(locals, 0);
for (; (lp = ao2_iterator_next(&it)); ao2_ref(lp, -1)) {
ao2_lock(lp);
if (!strcmp(exten, lp->exten)
&& !strcmp(context, lp->context)) {
res = AST_DEVICE_NOT_INUSE;
if (lp->base.owner
&& ast_test_flag(&lp->base, AST_UNREAL_CARETAKER_THREAD)) {
is_inuse = 1;
}
}
ao2_unlock(lp);
if (is_inuse) {
res = AST_DEVICE_INUSE;
ao2_ref(lp, -1);
break;
}
}
ao2_iterator_destroy(&it);
if (res == AST_DEVICE_INVALID) {
ast_debug(3, "Checking if extension %s@%s exists (devicestate)\n", exten, context);
if (ast_exists_extension(NULL, context, exten, 1, NULL)) {
res = AST_DEVICE_NOT_INUSE;
}
}
return res;
}
static struct ast_multi_channel_blob *local_channel_optimization_blob(struct local_pvt *p,
struct ast_json *json_object)
{
struct ast_multi_channel_blob *payload;
RAII_VAR(struct ast_channel_snapshot *, local_one_snapshot, NULL, ao2_cleanup);
RAII_VAR(struct ast_channel_snapshot *, local_two_snapshot, NULL, ao2_cleanup);
local_one_snapshot = ast_channel_snapshot_get_latest(ast_channel_uniqueid(p->base.owner));
if (!local_one_snapshot) {
return NULL;
}
local_two_snapshot = ast_channel_snapshot_get_latest(ast_channel_uniqueid(p->base.chan));
if (!local_two_snapshot) {
return NULL;
}
payload = ast_multi_channel_blob_create(json_object);
if (!payload) {
return NULL;
}
ast_multi_channel_blob_add_channel(payload, "1", local_one_snapshot);
ast_multi_channel_blob_add_channel(payload, "2", local_two_snapshot);
return payload;
}
/*! \brief Callback for \ref ast_unreal_pvt_callbacks \p optimization_started */
static void local_optimization_started_cb(struct ast_unreal_pvt *base, struct ast_channel *source,
enum ast_unreal_channel_indicator dest, unsigned int id)
{
RAII_VAR(struct ast_json *, json_object, ast_json_null(), ast_json_unref);
RAII_VAR(struct ast_multi_channel_blob *, payload, NULL, ao2_cleanup);
RAII_VAR(struct stasis_message *, msg, NULL, ao2_cleanup);
struct local_pvt *p = (struct local_pvt *)base;
if (!ast_local_optimization_begin_type()) {
return;
}
json_object = ast_json_pack("{s: i, s: I}",
"dest", dest, "id", (ast_json_int_t)id);
if (!json_object) {
return;
}
payload = local_channel_optimization_blob(p, json_object);
if (!payload) {
return;
}
if (source) {
RAII_VAR(struct ast_channel_snapshot *, source_snapshot, NULL, ao2_cleanup);
source_snapshot = ast_channel_snapshot_get_latest(ast_channel_uniqueid(source));
if (!source_snapshot) {
return;
}
ast_multi_channel_blob_add_channel(payload, "source", source_snapshot);
}
msg = stasis_message_create(ast_local_optimization_begin_type(), payload);
if (!msg) {
return;
}
stasis_publish(ast_channel_topic(p->base.owner), msg);
}
/*! \brief Callback for \ref ast_unreal_pvt_callbacks \p optimization_finished */
static void local_optimization_finished_cb(struct ast_unreal_pvt *base, int success, unsigned int id)
{
RAII_VAR(struct ast_json *, json_object, ast_json_null(), ast_json_unref);
RAII_VAR(struct ast_multi_channel_blob *, payload, NULL, ao2_cleanup);
RAII_VAR(struct stasis_message *, msg, NULL, ao2_cleanup);
struct local_pvt *p = (struct local_pvt *)base;
if (!ast_local_optimization_end_type()) {
return;
}
json_object = ast_json_pack("{s: i, s: I}", "success", success, "id", (ast_json_int_t)id);
if (!json_object) {
return;
}
payload = local_channel_optimization_blob(p, json_object);
if (!payload) {
return;
}
msg = stasis_message_create(ast_local_optimization_end_type(), payload);
if (!msg) {
return;
}
stasis_publish(ast_channel_topic(p->base.owner), msg);
}
static struct ast_manager_event_blob *local_message_to_ami(struct stasis_message *message)
{
struct ast_multi_channel_blob *obj = stasis_message_data(message);
struct ast_json *blob = ast_multi_channel_blob_get_json(obj);
struct ast_channel_snapshot *local_snapshot_one;
struct ast_channel_snapshot *local_snapshot_two;
RAII_VAR(struct ast_str *, local_channel_one, NULL, ast_free);
RAII_VAR(struct ast_str *, local_channel_two, NULL, ast_free);
RAII_VAR(struct ast_str *, event_buffer, NULL, ast_free);
const char *event;
local_snapshot_one = ast_multi_channel_blob_get_channel(obj, "1");
local_snapshot_two = ast_multi_channel_blob_get_channel(obj, "2");
if (!local_snapshot_one || !local_snapshot_two) {
return NULL;
}
event_buffer = ast_str_create(1024);
local_channel_one = ast_manager_build_channel_state_string_prefix(local_snapshot_one, "LocalOne");
local_channel_two = ast_manager_build_channel_state_string_prefix(local_snapshot_two, "LocalTwo");
if (!event_buffer || !local_channel_one || !local_channel_two) {
return NULL;
}
if (stasis_message_type(message) == ast_local_optimization_begin_type()) {
struct ast_channel_snapshot *source_snapshot;
RAII_VAR(struct ast_str *, source_str, NULL, ast_free);
const char *dest_uniqueid;
source_snapshot = ast_multi_channel_blob_get_channel(obj, "source");
if (source_snapshot) {
source_str = ast_manager_build_channel_state_string_prefix(source_snapshot, "Source");
if (!source_str) {
return NULL;
}
}
dest_uniqueid = ast_json_object_get(blob, "dest") == AST_UNREAL_OWNER ?
local_snapshot_one->base->uniqueid : local_snapshot_two->base->uniqueid;
event = "LocalOptimizationBegin";
if (source_str) {
ast_str_append(&event_buffer, 0, "%s", ast_str_buffer(source_str));
}
ast_str_append(&event_buffer, 0, "DestUniqueId: %s\r\n", dest_uniqueid);
ast_str_append(&event_buffer, 0, "Id: %u\r\n", (unsigned int) ast_json_integer_get(ast_json_object_get(blob, "id")));
} else if (stasis_message_type(message) == ast_local_optimization_end_type()) {
event = "LocalOptimizationEnd";
ast_str_append(&event_buffer, 0, "Success: %s\r\n", ast_json_integer_get(ast_json_object_get(blob, "success")) ? "Yes" : "No");
ast_str_append(&event_buffer, 0, "Id: %u\r\n", (unsigned int) ast_json_integer_get(ast_json_object_get(blob, "id")));
} else if (stasis_message_type(message) == ast_local_bridge_type()) {
event = "LocalBridge";
ast_str_append(&event_buffer, 0, "Context: %s\r\n", ast_json_string_get(ast_json_object_get(blob, "context")));
ast_str_append(&event_buffer, 0, "Exten: %s\r\n", ast_json_string_get(ast_json_object_get(blob, "exten")));
ast_str_append(&event_buffer, 0, "LocalOptimization: %s\r\n", ast_json_is_true(ast_json_object_get(blob, "can_optimize")) ? "Yes" : "No");
} else {
return NULL;
}
return ast_manager_event_blob_create(EVENT_FLAG_CALL, event,
"%s"
"%s"
"%s",
ast_str_buffer(local_channel_one),
ast_str_buffer(local_channel_two),
ast_str_buffer(event_buffer));
}
/*!
* \internal
* \brief Post the \ref ast_local_bridge_type \ref stasis message
* \since 12.0.0
*
* \param p local_pvt to raise the local bridge message
*/
static void publish_local_bridge_message(struct local_pvt *p)
{
RAII_VAR(struct ast_multi_channel_blob *, multi_blob, NULL, ao2_cleanup);
RAII_VAR(struct ast_json *, blob, NULL, ast_json_unref);
RAII_VAR(struct stasis_message *, msg, NULL, ao2_cleanup);
RAII_VAR(struct ast_channel_snapshot *, one_snapshot, NULL, ao2_cleanup);
RAII_VAR(struct ast_channel_snapshot *, two_snapshot, NULL, ao2_cleanup);
struct ast_channel *owner;
struct ast_channel *chan;
if (!ast_local_bridge_type()) {
return;
}
ast_unreal_lock_all(&p->base, &chan, &owner);
blob = ast_json_pack("{s: s, s: s, s: b}",
"context", p->context,
"exten", p->exten,
"can_optimize", !ast_test_flag(&p->base, AST_UNREAL_NO_OPTIMIZATION));
if (!blob) {
goto end;
}
multi_blob = ast_multi_channel_blob_create(blob);
if (!multi_blob) {
goto end;
}
one_snapshot = ast_channel_snapshot_get_latest(ast_channel_uniqueid(owner));
if (!one_snapshot) {
goto end;
}
two_snapshot = ast_channel_snapshot_get_latest(ast_channel_uniqueid(chan));
if (!two_snapshot) {
goto end;
}
ast_multi_channel_blob_add_channel(multi_blob, "1", one_snapshot);
ast_multi_channel_blob_add_channel(multi_blob, "2", two_snapshot);
msg = stasis_message_create(ast_local_bridge_type(), multi_blob);
if (!msg) {
goto end;
}
stasis_publish(ast_channel_topic(owner), msg);
end:
ast_channel_unlock(owner);
ast_channel_unref(owner);
ast_channel_unlock(chan);
ast_channel_unref(chan);
ao2_unlock(&p->base);
}
int ast_local_setup_bridge(struct ast_channel *ast, struct ast_bridge *bridge, struct ast_channel *swap, struct ast_bridge_features *features)
{
struct local_pvt *p;
struct local_pvt *found;
int res = -1;
/* Sanity checks. */
if (!ast || !bridge) {
ast_bridge_features_destroy(features);
return -1;
}
ast_channel_lock(ast);
p = ast_channel_tech_pvt(ast);
ast_channel_unlock(ast);
found = p ? ao2_find(locals, p, 0) : NULL;
if (found) {
ao2_lock(found);
if (found->type == LOCAL_CALL_ACTION_DIALPLAN
&& found->base.owner
&& found->base.chan
&& !ast_test_flag(&found->base, AST_UNREAL_CARETAKER_THREAD)) {
ao2_ref(bridge, +1);
if (swap) {
ast_channel_ref(swap);
}
found->type = LOCAL_CALL_ACTION_BRIDGE;
found->action.bridge.join = bridge;
found->action.bridge.swap = swap;
found->action.bridge.features = features;
res = 0;
} else {
ast_bridge_features_destroy(features);
}
ao2_unlock(found);
ao2_ref(found, -1);
}
return res;
}
int ast_local_setup_masquerade(struct ast_channel *ast, struct ast_channel *masq)
{
struct local_pvt *p;
struct local_pvt *found;
int res = -1;
/* Sanity checks. */
if (!ast || !masq) {
return -1;
}
ast_channel_lock(ast);
p = ast_channel_tech_pvt(ast);
ast_channel_unlock(ast);
found = p ? ao2_find(locals, p, 0) : NULL;
if (found) {
ao2_lock(found);
if (found->type == LOCAL_CALL_ACTION_DIALPLAN
&& found->base.owner
&& found->base.chan
&& !ast_test_flag(&found->base, AST_UNREAL_CARETAKER_THREAD)) {
ast_channel_ref(masq);
found->type = LOCAL_CALL_ACTION_MASQUERADE;
found->action.masq = masq;
res = 0;
}
ao2_unlock(found);
ao2_ref(found, -1);
}
return res;
}
/*! \brief Initiate new call, part of PBX interface
* dest is the dial string */
static int local_call(struct ast_channel *ast, const char *dest, int timeout)
{
struct local_pvt *p = ast_channel_tech_pvt(ast);
int pvt_locked = 0;
struct ast_channel *owner = NULL;
struct ast_channel *chan = NULL;
int res;
char *reduced_dest = ast_strdupa(dest);
char *slash;
const char *chan_cid;
if (!p) {
return -1;
}
/* since we are letting go of channel locks that were locked coming into
* this function, then we need to give the tech pvt a ref */
ao2_ref(p, 1);
ast_channel_unlock(ast);
ast_unreal_lock_all(&p->base, &chan, &owner);
pvt_locked = 1;
if (owner != ast) {
res = -1;
goto return_cleanup;
}
if (!owner || !chan) {
res = -1;
goto return_cleanup;
}
ast_unreal_call_setup(owner, chan);
/*
* If the local channel has /n on the end of it, we need to lop
* that off for our argument to setting up the CC_INTERFACES
* variable.
*/
if ((slash = strrchr(reduced_dest, '/'))) {
*slash = '\0';
}
ast_set_cc_interfaces_chanvar(chan, reduced_dest);
ao2_unlock(p);
pvt_locked = 0;
ast_channel_unlock(owner);
chan_cid = S_COR(ast_channel_caller(chan)->id.number.valid,
ast_channel_caller(chan)->id.number.str, NULL);
if (chan_cid) {
chan_cid = ast_strdupa(chan_cid);
}
ast_channel_unlock(chan);
res = -1;
switch (p->type) {
case LOCAL_CALL_ACTION_DIALPLAN:
if (!ast_exists_extension(NULL, p->context, p->exten, 1, chan_cid)) {
ast_log(LOG_NOTICE, "No such extension/context %s@%s while calling Local channel\n",
p->exten, p->context);
} else {
publish_local_bridge_message(p);
/* Start switch on sub channel */
res = ast_pbx_start(chan);
}
break;
case LOCAL_CALL_ACTION_BRIDGE:
publish_local_bridge_message(p);
ast_answer(chan);
res = ast_bridge_impart(p->action.bridge.join, chan, p->action.bridge.swap,
p->action.bridge.features, AST_BRIDGE_IMPART_CHAN_INDEPENDENT);
ao2_ref(p->action.bridge.join, -1);
p->action.bridge.join = NULL;
ao2_cleanup(p->action.bridge.swap);
p->action.bridge.swap = NULL;
p->action.bridge.features = NULL;
break;
case LOCAL_CALL_ACTION_MASQUERADE:
publish_local_bridge_message(p);
ast_answer(chan);
res = ast_channel_move(p->action.masq, chan);
if (!res) {
/* Chan is now an orphaned zombie. Destroy it. */
ast_hangup(chan);
}
p->action.masq = ast_channel_unref(p->action.masq);
break;
}
if (!res) {
ao2_lock(p);
ast_set_flag(&p->base, AST_UNREAL_CARETAKER_THREAD);
ao2_unlock(p);
}
/* we already unlocked them, clear them here so the cleanup label won't touch them. */
owner = ast_channel_unref(owner);
chan = ast_channel_unref(chan);
return_cleanup:
if (p) {
if (pvt_locked) {
ao2_unlock(p);
}
ao2_ref(p, -1);
}
if (chan) {
ast_channel_unlock(chan);
ast_channel_unref(chan);
}
/*
* owner is supposed to be == to ast, if it is, don't unlock it
* because ast must exit locked
*/
if (owner) {
if (owner != ast) {
ast_channel_unlock(owner);
ast_channel_lock(ast);
}
ast_channel_unref(owner);
} else {
/* we have to exit with ast locked */
ast_channel_lock(ast);
}
return res;
}
/*! \brief Hangup a call through the local proxy channel */
static int local_hangup(struct ast_channel *ast)
{
struct local_pvt *p = ast_channel_tech_pvt(ast);
int res;
if (!p) {
return -1;
}
/* give the pvt a ref to fulfill calling requirements. */
ao2_ref(p, +1);
res = ast_unreal_hangup(&p->base, ast);
if (!res) {
int unlink;
ao2_lock(p);
unlink = !p->base.owner && !p->base.chan;
ao2_unlock(p);
if (unlink) {
ao2_unlink(locals, p);
}
}
ao2_ref(p, -1);
return res;
}
/*!
* \internal
* \brief struct local_pvt destructor.
*
* \param vdoomed Object to destroy.
*/
static void local_pvt_destructor(void *vdoomed)
{
struct local_pvt *doomed = vdoomed;
switch (doomed->type) {
case LOCAL_CALL_ACTION_DIALPLAN:
break;
case LOCAL_CALL_ACTION_BRIDGE:
ao2_cleanup(doomed->action.bridge.join);
ao2_cleanup(doomed->action.bridge.swap);
ast_bridge_features_destroy(doomed->action.bridge.features);
break;
case LOCAL_CALL_ACTION_MASQUERADE:
ao2_cleanup(doomed->action.masq);
break;
}
ast_unreal_destructor(&doomed->base);
}
/*! \brief Create a call structure */
static struct local_pvt *local_alloc(const char *data, struct ast_stream_topology *topology)
{
struct local_pvt *pvt;
char *parse;
char *context;
char *opts;
pvt = (struct local_pvt *) ast_unreal_alloc_stream_topology(sizeof(*pvt), local_pvt_destructor, topology);
if (!pvt) {
return NULL;
}
pvt->base.callbacks = &local_unreal_callbacks;
parse = ast_strdupa(data);
/*
* Local channels intercept MOH by default.
*
* This is a silly default because it represents state held by
* the local channels. Unless local channel optimization is
* disabled, the state will dissapear when the local channels
* optimize out.
*/
ast_set_flag(&pvt->base, AST_UNREAL_MOH_INTERCEPT);
/* Look for options */
if ((opts = strchr(parse, '/'))) {
*opts++ = '\0';
if (strchr(opts, 'n')) {
ast_set_flag(&pvt->base, AST_UNREAL_NO_OPTIMIZATION);
}
if (strchr(opts, 'j')) {
if (ast_test_flag(&pvt->base, AST_UNREAL_NO_OPTIMIZATION)) {
ast_set_flag(&pvt->base.jb_conf, AST_JB_ENABLED);
} else {
ast_log(LOG_ERROR, "You must use the 'n' option with the 'j' option to enable the jitter buffer\n");
}
}
if (strchr(opts, 'm')) {
ast_clear_flag(&pvt->base, AST_UNREAL_MOH_INTERCEPT);
}
}
/* Look for a context */
if ((context = strchr(parse, '@'))) {
*context++ = '\0';
}
ast_copy_string(pvt->context, S_OR(context, "default"), sizeof(pvt->context));
ast_copy_string(pvt->exten, parse, sizeof(pvt->exten));
snprintf(pvt->base.name, sizeof(pvt->base.name), "%s@%s", pvt->exten, pvt->context);
return pvt; /* this is returned with a ref */
}
/*! \brief Part of PBX interface */
static struct ast_channel *local_request(const char *type, struct ast_format_cap *cap, const struct ast_assigned_ids *assignedids, const struct ast_channel *requestor, const char *data, int *cause)
{
struct ast_stream_topology *topology;
struct ast_channel *chan;
topology = ast_stream_topology_create_from_format_cap(cap);
if (!topology) {
return NULL;
}
chan = local_request_with_stream_topology(type, topology, assignedids, requestor, data, cause);
ast_stream_topology_free(topology);
return chan;
}
/*! \brief Part of PBX interface */
static struct ast_channel *local_request_with_stream_topology(const char *type, struct ast_stream_topology *topology, const struct ast_assigned_ids *assignedids, const struct ast_channel *requestor, const char *data, int *cause)
{
struct ast_stream_topology *audio_filtered_topology;
int i;
struct local_pvt *p;
struct ast_channel *chan;
ast_callid callid;
/* Create a copy of the requested topology as we don't have ownership over
* the one that is passed in.
*/
audio_filtered_topology = ast_stream_topology_clone(topology);
if (!audio_filtered_topology) {
return NULL;
}
/* Some users of Local channels request every known format in the
* universe. The core itself automatically pruned this list down to a single
* "best" format for audio in non-multistream. We replicate the logic here to
* do the same thing.
*/
for (i = 0; i < ast_stream_topology_get_count(audio_filtered_topology); ++i) {
struct ast_stream *stream;
int res;
struct ast_format *tmp_fmt = NULL;
struct ast_format *best_audio_fmt = NULL;
struct ast_format_cap *caps;
stream = ast_stream_topology_get_stream(audio_filtered_topology, i);
if (ast_stream_get_type(stream) != AST_MEDIA_TYPE_AUDIO ||
ast_stream_get_state(stream) == AST_STREAM_STATE_REMOVED) {
continue;
}
/* Respect the immutable state of formats on the stream and create a new
* format capabilities to replace the existing one.
*/
caps = ast_format_cap_alloc(AST_FORMAT_CAP_FLAG_DEFAULT);
if (!caps) {
ao2_ref(audio_filtered_topology, -1);
return NULL;
}
/* The ast_translator_best_choice function treats both caps as const
* but does not declare it in the API.
*/
res = ast_translator_best_choice((struct ast_format_cap *)ast_stream_get_formats(stream), local_tech.capabilities,
&tmp_fmt, &best_audio_fmt);
if (res < 0) {
struct ast_str *tech_codecs = ast_str_alloca(AST_FORMAT_CAP_NAMES_LEN);
struct ast_str *request_codecs = ast_str_alloca(AST_FORMAT_CAP_NAMES_LEN);
ast_log(LOG_WARNING, "No translator path exists for channel type %s (native %s) to %s\n", type,
ast_format_cap_get_names(local_tech.capabilities, &tech_codecs),
ast_format_cap_get_names(ast_stream_get_formats(stream), &request_codecs));
/* If there are no formats then we abort */
ao2_ref(caps, -1);
ao2_ref(audio_filtered_topology, -1);
return NULL;
}
ast_format_cap_append(caps, best_audio_fmt, 0);
ast_stream_set_formats(stream, caps);