When manipulating flags on a channel the channel has to be locked to guarantee that nothing else is also manipulating the flags. This change introduces locking where necessary to guarantee this. It also adds helper functions that manipulate channel flags and lock to reduce repeated code. ASTERISK-26789 Change-Id: I489280662dba0f4c50981bfc5b5a7073fef2db10
648 lines
18 KiB
C
648 lines
18 KiB
C
/*
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* Asterisk -- An open source telephony toolkit.
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*
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* Copyright (C) 2007 - 2009, Digium, Inc.
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*
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* Richard Mudgett <rmudgett@digium.com>
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*
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* See http://www.asterisk.org for more information about
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* the Asterisk project. Please do not directly contact
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* any of the maintainers of this project for assistance;
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* the project provides a web site, mailing lists and IRC
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* channels for your use.
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*
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* This program is free software, distributed under the terms of
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* the GNU General Public License Version 2. See the LICENSE file
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* at the top of the source tree.
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*/
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/*!
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* \file
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* \brief After Bridge Execution API
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*
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* \author Richard Mudgett <rmudgett@digium.com>
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*
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* See Also:
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* \arg \ref AstCREDITS
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*/
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/*** MODULEINFO
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<support_level>core</support_level>
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***/
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#include "asterisk.h"
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#include "asterisk/logger.h"
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#include "asterisk/channel.h"
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#include "asterisk/pbx.h"
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#include "asterisk/bridge_after.h"
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struct after_bridge_cb_node {
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/*! Next list node. */
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AST_LIST_ENTRY(after_bridge_cb_node) list;
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/*! Desired callback function. */
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ast_bridge_after_cb callback;
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/*! After bridge callback will not be called and destroy any resources data may contain. */
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ast_bridge_after_cb_failed failed;
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/*! Extra data to pass to the callback. */
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void *data;
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/*! Reason the after bridge callback failed. */
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enum ast_bridge_after_cb_reason reason;
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};
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struct after_bridge_cb_ds {
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/*! After bridge callbacks container. */
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AST_LIST_HEAD(, after_bridge_cb_node) callbacks;
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};
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/*!
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* \internal
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* \brief Indicate after bridge callback failed.
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* \since 12.0.0
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*
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* \param node After bridge callback node.
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*
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* \return Nothing
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*/
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static void after_bridge_cb_failed(struct after_bridge_cb_node *node)
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{
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if (node->failed) {
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node->failed(node->reason, node->data);
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node->failed = NULL;
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}
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}
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/*!
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* \internal
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* \brief Run discarding any after bridge callbacks.
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* \since 12.0.0
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*
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* \param after_bridge After bridge callback container process.
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* \param reason Why are we doing this.
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*
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* \return Nothing
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*/
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static void after_bridge_cb_run_discard(struct after_bridge_cb_ds *after_bridge, enum ast_bridge_after_cb_reason reason)
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{
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struct after_bridge_cb_node *node;
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for (;;) {
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AST_LIST_LOCK(&after_bridge->callbacks);
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node = AST_LIST_REMOVE_HEAD(&after_bridge->callbacks, list);
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AST_LIST_UNLOCK(&after_bridge->callbacks);
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if (!node) {
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break;
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}
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if (!node->reason) {
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node->reason = reason;
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}
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after_bridge_cb_failed(node);
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ast_free(node);
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}
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}
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/*!
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* \internal
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* \brief Destroy the after bridge callback datastore.
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* \since 12.0.0
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*
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* \param data After bridge callback data to destroy.
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*
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* \return Nothing
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*/
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static void after_bridge_cb_destroy(void *data)
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{
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struct after_bridge_cb_ds *after_bridge = data;
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after_bridge_cb_run_discard(after_bridge, AST_BRIDGE_AFTER_CB_REASON_DESTROY);
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AST_LIST_HEAD_DESTROY(&after_bridge->callbacks);
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ast_free(after_bridge);
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}
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static struct after_bridge_cb_ds *after_bridge_cb_find(struct ast_channel *chan);
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/*!
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* \internal
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* \brief Fixup the after bridge callback datastore.
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* \since 12.0.0
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*
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* \param data After bridge callback data to fixup.
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* \param old_chan The datastore is moving from this channel.
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* \param new_chan The datastore is moving to this channel.
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*
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* \return Nothing
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*/
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static void after_bridge_cb_fixup(void *data, struct ast_channel *old_chan, struct ast_channel *new_chan)
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{
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struct after_bridge_cb_ds *after_bridge;
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struct after_bridge_cb_node *node;
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after_bridge = after_bridge_cb_find(new_chan);
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if (!after_bridge) {
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return;
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}
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AST_LIST_LOCK(&after_bridge->callbacks);
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node = AST_LIST_LAST(&after_bridge->callbacks);
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if (node && !node->reason) {
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node->reason = AST_BRIDGE_AFTER_CB_REASON_MASQUERADE;
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}
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AST_LIST_UNLOCK(&after_bridge->callbacks);
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}
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static const struct ast_datastore_info after_bridge_cb_info = {
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.type = "after-bridge-cb",
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.destroy = after_bridge_cb_destroy,
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.chan_fixup = after_bridge_cb_fixup,
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};
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/*!
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* \internal
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* \brief Find an after bridge callback datastore container.
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* \since 12.0.0
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*
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* \param chan Channel to find the after bridge callback container on.
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*
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* \retval after_bridge datastore container on success.
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* \retval NULL on error.
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*/
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static struct after_bridge_cb_ds *after_bridge_cb_find(struct ast_channel *chan)
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{
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struct ast_datastore *datastore;
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SCOPED_CHANNELLOCK(lock, chan);
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datastore = ast_channel_datastore_find(chan, &after_bridge_cb_info, NULL);
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if (!datastore) {
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return NULL;
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}
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return datastore->data;
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}
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/*!
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* \internal
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* \brief Setup/create an after bridge callback datastore container.
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* \since 12.0.0
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*
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* \param chan Channel to setup/create the after bridge callback container on.
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*
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* \retval after_bridge datastore container on success.
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* \retval NULL on error.
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*/
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static struct after_bridge_cb_ds *after_bridge_cb_setup(struct ast_channel *chan)
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{
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struct ast_datastore *datastore;
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struct after_bridge_cb_ds *after_bridge;
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SCOPED_CHANNELLOCK(lock, chan);
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datastore = ast_channel_datastore_find(chan, &after_bridge_cb_info, NULL);
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if (datastore) {
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return datastore->data;
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}
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/* Create a new datastore. */
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datastore = ast_datastore_alloc(&after_bridge_cb_info, NULL);
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if (!datastore) {
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return NULL;
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}
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after_bridge = ast_calloc(1, sizeof(*after_bridge));
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if (!after_bridge) {
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ast_datastore_free(datastore);
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return NULL;
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}
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AST_LIST_HEAD_INIT(&after_bridge->callbacks);
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datastore->data = after_bridge;
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ast_channel_datastore_add(chan, datastore);
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return datastore->data;
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}
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void ast_bridge_run_after_callback(struct ast_channel *chan)
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{
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struct after_bridge_cb_ds *after_bridge;
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struct after_bridge_cb_node *node;
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after_bridge = after_bridge_cb_find(chan);
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if (!after_bridge) {
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return;
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}
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for (;;) {
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AST_LIST_LOCK(&after_bridge->callbacks);
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node = AST_LIST_REMOVE_HEAD(&after_bridge->callbacks, list);
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AST_LIST_UNLOCK(&after_bridge->callbacks);
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if (!node) {
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break;
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}
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if (node->reason) {
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after_bridge_cb_failed(node);
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} else {
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node->failed = NULL;
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node->callback(chan, node->data);
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}
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ast_free(node);
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}
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}
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void ast_bridge_discard_after_callback(struct ast_channel *chan, enum ast_bridge_after_cb_reason reason)
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{
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struct after_bridge_cb_ds *after_bridge;
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after_bridge = after_bridge_cb_find(chan);
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if (!after_bridge) {
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return;
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}
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after_bridge_cb_run_discard(after_bridge, reason);
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}
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int ast_bridge_set_after_callback(struct ast_channel *chan, ast_bridge_after_cb callback, ast_bridge_after_cb_failed failed, void *data)
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{
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struct after_bridge_cb_ds *after_bridge;
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struct after_bridge_cb_node *new_node;
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struct after_bridge_cb_node *last_node;
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/* Sanity checks. */
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ast_assert(chan != NULL);
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if (!chan || !callback) {
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return -1;
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}
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after_bridge = after_bridge_cb_setup(chan);
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if (!after_bridge) {
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return -1;
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}
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/* Create a new callback node. */
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new_node = ast_calloc(1, sizeof(*new_node));
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if (!new_node) {
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return -1;
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}
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new_node->callback = callback;
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new_node->failed = failed;
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new_node->data = data;
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/* Put it in the container disabling any previously active one. */
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AST_LIST_LOCK(&after_bridge->callbacks);
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last_node = AST_LIST_LAST(&after_bridge->callbacks);
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if (last_node && !last_node->reason) {
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last_node->reason = AST_BRIDGE_AFTER_CB_REASON_REPLACED;
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}
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AST_LIST_INSERT_TAIL(&after_bridge->callbacks, new_node, list);
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AST_LIST_UNLOCK(&after_bridge->callbacks);
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return 0;
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}
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const char *reason_strings[] = {
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[AST_BRIDGE_AFTER_CB_REASON_DESTROY] = "Channel destroyed (hungup)",
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[AST_BRIDGE_AFTER_CB_REASON_REPLACED] = "Callback was replaced",
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[AST_BRIDGE_AFTER_CB_REASON_MASQUERADE] = "Channel masqueraded",
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[AST_BRIDGE_AFTER_CB_REASON_DEPART] = "Channel was departed from bridge",
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[AST_BRIDGE_AFTER_CB_REASON_REMOVED] = "Callback was removed",
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};
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const char *ast_bridge_after_cb_reason_string(enum ast_bridge_after_cb_reason reason)
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{
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if (reason < AST_BRIDGE_AFTER_CB_REASON_DESTROY
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|| AST_BRIDGE_AFTER_CB_REASON_REMOVED < reason
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|| !reason_strings[reason]) {
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return "Unknown";
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}
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return reason_strings[reason];
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}
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struct after_bridge_goto_ds {
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/*! Goto string that can be parsed by ast_parseable_goto(). */
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const char *parseable_goto;
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/*! Specific goto context or default context for parseable_goto. */
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const char *context;
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/*! Specific goto exten or default exten for parseable_goto. */
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const char *exten;
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/*! Specific goto priority or default priority for parseable_goto. */
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int priority;
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/*! TRUE if the peer should run the h exten. */
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unsigned int run_h_exten:1;
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/*! Specific goto location */
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unsigned int specific:1;
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};
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/*!
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* \internal
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* \brief Destroy the after bridge goto datastore.
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* \since 12.0.0
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*
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* \param data After bridge goto data to destroy.
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*
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* \return Nothing
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*/
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static void after_bridge_goto_destroy(void *data)
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{
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struct after_bridge_goto_ds *after_bridge = data;
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ast_free((char *) after_bridge->parseable_goto);
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ast_free((char *) after_bridge->context);
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ast_free((char *) after_bridge->exten);
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ast_free((char *) after_bridge);
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}
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/*!
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* \internal
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* \brief Fixup the after bridge goto datastore.
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* \since 12.0.0
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*
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* \param data After bridge goto data to fixup.
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* \param old_chan The datastore is moving from this channel.
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* \param new_chan The datastore is moving to this channel.
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*
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* \return Nothing
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*/
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static void after_bridge_goto_fixup(void *data, struct ast_channel *old_chan, struct ast_channel *new_chan)
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{
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/* There can be only one. Discard any already on the new channel. */
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ast_bridge_discard_after_goto(new_chan);
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}
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static const struct ast_datastore_info after_bridge_goto_info = {
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.type = "after-bridge-goto",
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.destroy = after_bridge_goto_destroy,
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.chan_fixup = after_bridge_goto_fixup,
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};
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/*!
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* \internal
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* \brief Remove channel goto location after the bridge and return it.
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* \since 12.0.0
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*
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* \param chan Channel to remove after bridge goto location.
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*
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* \retval datastore on success.
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* \retval NULL on error or not found.
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*/
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static struct ast_datastore *after_bridge_goto_remove(struct ast_channel *chan)
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{
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struct ast_datastore *datastore;
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ast_channel_lock(chan);
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datastore = ast_channel_datastore_find(chan, &after_bridge_goto_info, NULL);
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if (datastore && ast_channel_datastore_remove(chan, datastore)) {
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datastore = NULL;
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}
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ast_channel_unlock(chan);
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return datastore;
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}
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void ast_bridge_discard_after_goto(struct ast_channel *chan)
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{
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struct ast_datastore *datastore;
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datastore = after_bridge_goto_remove(chan);
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if (datastore) {
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ast_datastore_free(datastore);
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}
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}
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void ast_bridge_read_after_goto(struct ast_channel *chan, char *buffer, size_t buf_size)
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{
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struct ast_datastore *datastore;
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struct after_bridge_goto_ds *after_bridge;
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char *current_pos = buffer;
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size_t remaining_size = buf_size;
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SCOPED_CHANNELLOCK(lock, chan);
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datastore = ast_channel_datastore_find(chan, &after_bridge_goto_info, NULL);
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if (!datastore) {
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buffer[0] = '\0';
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return;
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}
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after_bridge = datastore->data;
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if (after_bridge->parseable_goto) {
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snprintf(buffer, buf_size, "%s", after_bridge->parseable_goto);
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return;
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}
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if (!ast_strlen_zero(after_bridge->context)) {
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snprintf(current_pos, remaining_size, "%s,", after_bridge->context);
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remaining_size = remaining_size - strlen(current_pos);
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current_pos += strlen(current_pos);
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}
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if (after_bridge->run_h_exten) {
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snprintf(current_pos, remaining_size, "h,");
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remaining_size = remaining_size - strlen(current_pos);
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current_pos += strlen(current_pos);
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} else if (!ast_strlen_zero(after_bridge->exten)) {
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snprintf(current_pos, remaining_size, "%s,", after_bridge->exten);
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remaining_size = remaining_size - strlen(current_pos);
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current_pos += strlen(current_pos);
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}
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snprintf(current_pos, remaining_size, "%d", after_bridge->priority);
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}
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int ast_bridge_setup_after_goto(struct ast_channel *chan)
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{
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struct ast_datastore *datastore;
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struct after_bridge_goto_ds *after_bridge;
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int goto_failed = -1;
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/* We are going to be leaving the bridging system now;
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* clear any pending unbridge flags
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*/
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ast_channel_set_unbridged(chan, 0);
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/* Determine if we are going to setup a dialplan location and where. */
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if (ast_channel_softhangup_internal_flag(chan) & AST_SOFTHANGUP_ASYNCGOTO) {
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/* An async goto has already setup a location. */
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ast_channel_clear_softhangup(chan, AST_SOFTHANGUP_ASYNCGOTO);
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if (!ast_check_hangup(chan)) {
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goto_failed = 0;
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}
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return goto_failed;
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}
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/* Get after bridge goto datastore. */
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datastore = after_bridge_goto_remove(chan);
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if (!datastore) {
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return goto_failed;
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}
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after_bridge = datastore->data;
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if (after_bridge->run_h_exten) {
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if (ast_exists_extension(chan, after_bridge->context, "h", 1,
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S_COR(ast_channel_caller(chan)->id.number.valid,
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ast_channel_caller(chan)->id.number.str, NULL))) {
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ast_debug(1, "Running after bridge goto h exten %s,h,1\n",
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ast_channel_context(chan));
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ast_pbx_h_exten_run(chan, after_bridge->context);
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}
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} else if (!ast_check_hangup(chan)) {
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/* Clear the outgoing flag */
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ast_channel_clear_flag(chan, AST_FLAG_OUTGOING);
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if (after_bridge->specific) {
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goto_failed = ast_explicit_goto(chan, after_bridge->context,
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after_bridge->exten, after_bridge->priority);
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} else if (!ast_strlen_zero(after_bridge->parseable_goto)) {
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char *context;
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char *exten;
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int priority;
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/* Option F(x) for Bridge(), Dial(), and Queue() */
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/* Save current dialplan location in case of failure. */
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context = ast_strdupa(ast_channel_context(chan));
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exten = ast_strdupa(ast_channel_exten(chan));
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priority = ast_channel_priority(chan);
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/* Set current dialplan position to default dialplan position */
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ast_explicit_goto(chan, after_bridge->context, after_bridge->exten,
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after_bridge->priority);
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/* Then perform the goto */
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goto_failed = ast_parseable_goto(chan, after_bridge->parseable_goto);
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if (goto_failed) {
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/* Restore original dialplan location. */
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ast_channel_context_set(chan, context);
|
|
ast_channel_exten_set(chan, exten);
|
|
ast_channel_priority_set(chan, priority);
|
|
}
|
|
} else {
|
|
/* Option F() for Bridge(), Dial(), and Queue() */
|
|
goto_failed = ast_goto_if_exists(chan, after_bridge->context,
|
|
after_bridge->exten, after_bridge->priority + 1);
|
|
}
|
|
if (!goto_failed) {
|
|
if (ast_test_flag(ast_channel_flags(chan), AST_FLAG_IN_AUTOLOOP)) {
|
|
ast_channel_priority_set(chan, ast_channel_priority(chan) + 1);
|
|
}
|
|
|
|
ast_debug(1, "Setup after bridge goto location to %s,%s,%d.\n",
|
|
ast_channel_context(chan),
|
|
ast_channel_exten(chan),
|
|
ast_channel_priority(chan));
|
|
}
|
|
}
|
|
|
|
/* Discard after bridge goto datastore. */
|
|
ast_datastore_free(datastore);
|
|
|
|
return goto_failed;
|
|
}
|
|
|
|
void ast_bridge_run_after_goto(struct ast_channel *chan)
|
|
{
|
|
int goto_failed;
|
|
|
|
goto_failed = ast_bridge_setup_after_goto(chan);
|
|
if (goto_failed || ast_pbx_run(chan)) {
|
|
ast_hangup(chan);
|
|
}
|
|
}
|
|
|
|
/*!
|
|
* \internal
|
|
* \brief Set after bridge goto location of channel.
|
|
* \since 12.0.0
|
|
*
|
|
* \param chan Channel to setup after bridge goto location.
|
|
* \param run_h_exten TRUE if the h exten should be run.
|
|
* \param specific TRUE if the context/exten/priority is exactly specified.
|
|
* \param context Context to goto after bridge.
|
|
* \param exten Exten to goto after bridge. (Could be NULL if run_h_exten)
|
|
* \param priority Priority to goto after bridge.
|
|
* \param parseable_goto User specified goto string. (Could be NULL)
|
|
*
|
|
* \details Add a channel datastore to setup the goto location
|
|
* when the channel leaves the bridge and run a PBX from there.
|
|
*
|
|
* If run_h_exten then execute the h exten found in the given context.
|
|
* Else if specific then goto the given context/exten/priority.
|
|
* Else if parseable_goto then use the given context/exten/priority
|
|
* as the relative position for the parseable_goto.
|
|
* Else goto the given context/exten/priority+1.
|
|
*
|
|
* \return Nothing
|
|
*/
|
|
static void __after_bridge_set_goto(struct ast_channel *chan, int run_h_exten, int specific, const char *context, const char *exten, int priority, const char *parseable_goto)
|
|
{
|
|
struct ast_datastore *datastore;
|
|
struct after_bridge_goto_ds *after_bridge;
|
|
|
|
/* Sanity checks. */
|
|
ast_assert(chan != NULL);
|
|
if (!chan) {
|
|
return;
|
|
}
|
|
if (run_h_exten) {
|
|
ast_assert(run_h_exten && context);
|
|
if (!context) {
|
|
return;
|
|
}
|
|
} else {
|
|
ast_assert(context && exten && 0 < priority);
|
|
if (!context || !exten || priority < 1) {
|
|
return;
|
|
}
|
|
}
|
|
|
|
/* Create a new datastore. */
|
|
datastore = ast_datastore_alloc(&after_bridge_goto_info, NULL);
|
|
if (!datastore) {
|
|
return;
|
|
}
|
|
after_bridge = ast_calloc(1, sizeof(*after_bridge));
|
|
if (!after_bridge) {
|
|
ast_datastore_free(datastore);
|
|
return;
|
|
}
|
|
|
|
/* Initialize it. */
|
|
after_bridge->parseable_goto = ast_strdup(parseable_goto);
|
|
after_bridge->context = ast_strdup(context);
|
|
after_bridge->exten = ast_strdup(exten);
|
|
after_bridge->priority = priority;
|
|
after_bridge->run_h_exten = run_h_exten ? 1 : 0;
|
|
after_bridge->specific = specific ? 1 : 0;
|
|
datastore->data = after_bridge;
|
|
if ((parseable_goto && !after_bridge->parseable_goto)
|
|
|| (context && !after_bridge->context)
|
|
|| (exten && !after_bridge->exten)) {
|
|
ast_datastore_free(datastore);
|
|
return;
|
|
}
|
|
|
|
/* Put it on the channel replacing any existing one. */
|
|
ast_channel_lock(chan);
|
|
ast_bridge_discard_after_goto(chan);
|
|
ast_channel_datastore_add(chan, datastore);
|
|
ast_channel_unlock(chan);
|
|
}
|
|
|
|
void ast_bridge_set_after_goto(struct ast_channel *chan, const char *context, const char *exten, int priority)
|
|
{
|
|
__after_bridge_set_goto(chan, 0, 1, context, exten, priority, NULL);
|
|
}
|
|
|
|
void ast_bridge_set_after_h(struct ast_channel *chan, const char *context)
|
|
{
|
|
__after_bridge_set_goto(chan, 1, 0, context, NULL, 1, NULL);
|
|
}
|
|
|
|
void ast_bridge_set_after_go_on(struct ast_channel *chan, const char *context, const char *exten, int priority, const char *parseable_goto)
|
|
{
|
|
char *p_goto;
|
|
|
|
if (!ast_strlen_zero(parseable_goto)) {
|
|
p_goto = ast_strdupa(parseable_goto);
|
|
ast_replace_subargument_delimiter(p_goto);
|
|
} else {
|
|
p_goto = NULL;
|
|
}
|
|
__after_bridge_set_goto(chan, 0, 0, context, exten, priority, p_goto);
|
|
}
|