https://origsvn.digium.com/svn/asterisk/branches/1.4 ........ r162341 | file | 2008-12-09 17:14:29 -0400 (Tue, 09 Dec 2008) | 4 lines Add 'down' as a valid state for directed call pickup. This creeps up when we receive session progress when dialing a device and not ringing. (closes issue #14005) Reported by: ddl ........ git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@162342 65c4cc65-6c06-0410-ace0-fbb531ad65f3
309 lines
8.1 KiB
C
309 lines
8.1 KiB
C
/*
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* Asterisk -- An open source telephony toolkit.
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*
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* Copyright (C) 2005, Joshua Colp
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*
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* Joshua Colp <jcolp@digium.com>
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*
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* Portions merged from app_pickupchan, which was
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* Copyright (C) 2008, Gary Cook
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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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/*! \file
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*
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* \brief Directed Call Pickup Support
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*
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* \author Joshua Colp <jcolp@digium.com>
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* \author Gary Cook
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*
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* \ingroup applications
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*/
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#include "asterisk.h"
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ASTERISK_FILE_VERSION(__FILE__, "$Revision$")
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#include "asterisk/file.h"
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#include "asterisk/channel.h"
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#include "asterisk/pbx.h"
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#include "asterisk/module.h"
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#include "asterisk/lock.h"
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#include "asterisk/app.h"
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#include "asterisk/features.h"
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#define PICKUPMARK "PICKUPMARK"
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/*** DOCUMENTATION
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<application name="Pickup" language="en_US">
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<synopsis>
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Directed extension call pickup.
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</synopsis>
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<syntax argsep="&">
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<parameter name="ext" argsep="@" required="true">
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<argument name="extension" required="true"/>
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<argument name="context" />
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</parameter>
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<parameter name="ext2" argsep="@" multiple="true">
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<argument name="extension2" required="true"/>
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<argument name="context2"/>
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</parameter>
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</syntax>
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<description>
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<para>This application can pickup any ringing channel that is calling
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the specified <replaceable>extension</replaceable>. If no <replaceable>context</replaceable>
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is specified, the current context will be used. If you use the special string <literal>PICKUPMARK</literal>
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for the context parameter, for example 10@PICKUPMARK, this application
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tries to find a channel which has defined a <variable>PICKUPMARK</variable>
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channel variable with the same value as <replaceable>extension</replaceable>
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(in this example, <literal>10</literal>). When no parameter is specified, the application
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will pickup a channel matching the pickup group of the active channel.</para>
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</description>
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</application>
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<application name="PickupChan" language="en_US">
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<synopsis>
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Pickup a ringing channel.
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</synopsis>
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<syntax>
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<parameter name="channel" required="true" />
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<parameter name="channel2" multiple="true" />
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</syntax>
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<description>
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<para>This will pickup a specified <replaceable>channel</replaceable> if ringing.</para>
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</description>
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</application>
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***/
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static const char *app = "Pickup";
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static const char *app2 = "PickupChan";
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/*! \todo This application should return a result code, like PICKUPRESULT */
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/* Perform actual pickup between two channels */
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static int pickup_do(struct ast_channel *chan, struct ast_channel *target)
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{
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int res = 0;
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ast_debug(1, "Call pickup on '%s' by '%s'\n", target->name, chan->name);
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if ((res = ast_answer(chan))) {
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ast_log(LOG_WARNING, "Unable to answer '%s'\n", chan->name);
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return -1;
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}
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if ((res = ast_queue_control(chan, AST_CONTROL_ANSWER))) {
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ast_log(LOG_WARNING, "Unable to queue answer on '%s'\n", chan->name);
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return -1;
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}
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if ((res = ast_channel_masquerade(target, chan))) {
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ast_log(LOG_WARNING, "Unable to masquerade '%s' into '%s'\n", chan->name, target->name);
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return -1;
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}
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return res;
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}
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/* Helper function that determines whether a channel is capable of being picked up */
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static int can_pickup(struct ast_channel *chan)
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{
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if (!chan->pbx && (chan->_state == AST_STATE_RINGING || chan->_state == AST_STATE_RING || chan->_state == AST_STATE_DOWN))
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return 1;
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else
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return 0;
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}
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/*! \brief Helper Function to walk through ALL channels checking NAME and STATE */
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static struct ast_channel *my_ast_get_channel_by_name_locked(const char *channame)
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{
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struct ast_channel *chan;
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char *chkchan;
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size_t channame_len, chkchan_len;
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channame_len = strlen(channame);
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chkchan_len = channame_len + 2;
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chkchan = alloca(chkchan_len);
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/* need to append a '-' for the comparison so we check full channel name,
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* i.e SIP/hgc- , use a temporary variable so original stays the same for
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* debugging.
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*/
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strcpy(chkchan, channame);
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strcat(chkchan, "-");
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for (chan = ast_walk_channel_by_name_prefix_locked(NULL, channame, channame_len);
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chan;
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chan = ast_walk_channel_by_name_prefix_locked(chan, channame, channame_len)) {
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if (!strncasecmp(chan->name, chkchan, chkchan_len) && can_pickup(chan)) {
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return chan;
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}
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ast_channel_unlock(chan);
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}
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return NULL;
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}
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/*! \brief Attempt to pick up specified channel named , does not use context */
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static int pickup_by_channel(struct ast_channel *chan, char *pickup)
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{
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int res = 0;
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struct ast_channel *target;
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if (!(target = my_ast_get_channel_by_name_locked(pickup)))
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return -1;
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/* Just check that we are not picking up the SAME as target */
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if (chan->name != target->name && chan != target) {
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res = pickup_do(chan, target);
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ast_channel_unlock(target);
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}
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return res;
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}
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struct pickup_criteria {
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const char *exten;
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const char *context;
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};
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static int find_by_exten(struct ast_channel *c, void *data)
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{
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struct pickup_criteria *info = data;
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return (!strcasecmp(c->macroexten, info->exten) || !strcasecmp(c->exten, info->exten)) &&
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!strcasecmp(c->dialcontext, info->context) &&
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can_pickup(c);
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}
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/* Attempt to pick up specified extension with context */
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static int pickup_by_exten(struct ast_channel *chan, const char *exten, const char *context)
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{
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struct ast_channel *target = NULL;
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struct pickup_criteria search = {
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.exten = exten,
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.context = context,
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};
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target = ast_channel_search_locked(find_by_exten, &search);
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if (target) {
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int res = pickup_do(chan, target);
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ast_channel_unlock(target);
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target = NULL;
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return res;
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}
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return -1;
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}
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static int find_by_mark(struct ast_channel *c, void *data)
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{
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const char *mark = data;
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const char *tmp;
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return (tmp = pbx_builtin_getvar_helper(c, PICKUPMARK)) &&
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!strcasecmp(tmp, mark) &&
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can_pickup(c);
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}
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/* Attempt to pick up specified mark */
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static int pickup_by_mark(struct ast_channel *chan, const char *mark)
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{
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struct ast_channel *target = ast_channel_search_locked(find_by_mark, (char *) mark);
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if (target) {
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int res = pickup_do(chan, target);
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ast_channel_unlock(target);
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target = NULL;
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return res;
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}
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return -1;
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}
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/* application entry point for Pickup() */
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static int pickup_exec(struct ast_channel *chan, void *data)
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{
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int res = 0;
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char *tmp = ast_strdupa(data);
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char *exten = NULL, *context = NULL;
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if (ast_strlen_zero(data)) {
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res = ast_pickup_call(chan);
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return res;
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}
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/* Parse extension (and context if there) */
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while (!ast_strlen_zero(tmp) && (exten = strsep(&tmp, "&"))) {
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if ((context = strchr(exten, '@')))
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*context++ = '\0';
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if (!ast_strlen_zero(context) && !strcasecmp(context, PICKUPMARK)) {
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if (!pickup_by_mark(chan, exten))
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break;
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} else {
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if (!pickup_by_exten(chan, exten, !ast_strlen_zero(context) ? context : chan->context))
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break;
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}
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ast_log(LOG_NOTICE, "No target channel found for %s.\n", exten);
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}
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return res;
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}
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/* application entry point for PickupChan() */
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static int pickupchan_exec(struct ast_channel *chan, void *data)
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{
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int res = 0;
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char *tmp = ast_strdupa(data);
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char *pickup = NULL;
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if (ast_strlen_zero(data)) {
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ast_log(LOG_WARNING, "PickupChan requires an argument (channel)!\n");
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return -1;
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}
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/* Parse channel */
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while (!ast_strlen_zero(tmp) && (pickup = strsep(&tmp, "&"))) {
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if (!strncasecmp(chan->name, pickup, strlen(pickup))) {
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ast_log(LOG_NOTICE, "Cannot pickup your own channel %s.\n", pickup);
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} else {
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if (!pickup_by_channel(chan, pickup)) {
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break;
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}
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ast_log(LOG_NOTICE, "No target channel found for %s.\n", pickup);
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}
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}
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return res;
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}
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static int unload_module(void)
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{
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int res;
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res = ast_unregister_application(app);
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res |= ast_unregister_application(app2);
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return res;
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}
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static int load_module(void)
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{
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int res;
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res = ast_register_application_xml(app, pickup_exec);
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res |= ast_register_application_xml(app2, pickupchan_exec);
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return res;
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}
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AST_MODULE_INFO_STANDARD(ASTERISK_GPL_KEY, "Directed Call Pickup Application");
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