bridge_builtin_features.c

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/*
 * Asterisk -- An open source telephony toolkit.
 *
 * Copyright (C) 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 Built in bridging features
 *
 * \author Joshua Colp <jcolp@digium.com>
 *
 * \ingroup bridges
 */
 
/*** MODULEINFO
    <support_level>core</support_level>
 ***/
 
#include "asterisk.h"
 
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <sys/stat.h>
 
#include "asterisk/module.h"
#include "asterisk/channel.h"
#include "asterisk/bridge.h"
#include "asterisk/bridge_technology.h"
#include "asterisk/frame.h"
#include "asterisk/file.h"
#include "asterisk/app.h"
#include "asterisk/astobj2.h"
#include "asterisk/pbx.h"
#include "asterisk/parking.h"
#include "asterisk/features_config.h"
#include "asterisk/mixmonitor.h"
#include "asterisk/audiohook.h"
#include "asterisk/causes.h"
#include "asterisk/beep.h"
 
enum set_touch_variables_res {
    SET_TOUCH_SUCCESS,
    SET_TOUCH_UNSET,
    SET_TOUCH_ALLOC_FAILURE,
};
 
static void set_touch_variable(enum set_touch_variables_res *res, struct ast_channel *chan, const char *var_name, char **touch)
{
    const char *c_touch;
 
    if (*res == SET_TOUCH_ALLOC_FAILURE) {
        return;
    }
    c_touch = pbx_builtin_getvar_helper(chan, var_name);
    if (!ast_strlen_zero(c_touch)) {
        *touch = ast_strdup(c_touch);
        if (!*touch) {
            *res = SET_TOUCH_ALLOC_FAILURE;
        } else {
            *res = SET_TOUCH_SUCCESS;
        }
    }
}
 
static enum set_touch_variables_res set_touch_variables(struct ast_channel *chan, char **touch_format, char **touch_monitor, char **touch_monitor_prefix, char **touch_monitor_beep)
{
    enum set_touch_variables_res res = SET_TOUCH_UNSET;
    const char *var_format;
    const char *var_monitor;
    const char *var_prefix;
    const char *var_beep;
 
    SCOPED_CHANNELLOCK(lock, chan);
 
    var_format = "TOUCH_MIXMONITOR_FORMAT";
    var_monitor = "TOUCH_MIXMONITOR";
    var_prefix = "TOUCH_MIXMONITOR_PREFIX";
    var_beep = "TOUCH_MIXMONITOR_BEEP";
 
    set_touch_variable(&res, chan, var_format, touch_format);
    set_touch_variable(&res, chan, var_monitor, touch_monitor);
    set_touch_variable(&res, chan, var_prefix, touch_monitor_prefix);
    set_touch_variable(&res, chan, var_beep, touch_monitor_beep);
 
    return res;
}
 
 
static void stop_automixmonitor(struct ast_bridge_channel *bridge_channel, struct ast_channel *peer_chan, struct ast_features_general_config *features_cfg, const char *stop_message)
{
    ast_verb(4, "AutoMixMonitor used to stop recording call.\n");
 
    if (ast_stop_mixmonitor(peer_chan, NULL)) {
        ast_verb(4, "Failed to stop AutoMixMonitor for %s.\n", ast_channel_name(bridge_channel->chan));
        if (features_cfg && !(ast_strlen_zero(features_cfg->recordingfailsound))) {
            ast_bridge_channel_queue_playfile(bridge_channel, NULL, features_cfg->recordingfailsound, NULL);
        }
        return;
    }
 
    if (features_cfg && !ast_strlen_zero(features_cfg->courtesytone)) {
        ast_bridge_channel_queue_playfile(bridge_channel, NULL, features_cfg->courtesytone, NULL);
        ast_bridge_channel_write_playfile(bridge_channel, NULL, features_cfg->courtesytone, NULL);
    }
 
    if (!ast_strlen_zero(stop_message)) {
        ast_bridge_channel_queue_playfile(bridge_channel, NULL, stop_message, NULL);
        ast_bridge_channel_write_playfile(bridge_channel, NULL, stop_message, NULL);
    }
}
 
static void start_automixmonitor(struct ast_bridge_channel *bridge_channel, struct ast_channel *peer_chan, struct ast_features_general_config *features_cfg, const char *start_message)
{
    char *touch_filename, mix_options[32] = "b";
    size_t len;
    int x;
    enum set_touch_variables_res set_touch_res;
 
    RAII_VAR(char *, touch_format, NULL, ast_free);
    RAII_VAR(char *, touch_monitor, NULL, ast_free);
    RAII_VAR(char *, touch_monitor_prefix, NULL, ast_free);
    RAII_VAR(char *, touch_monitor_beep, NULL, ast_free);
 
    set_touch_res = set_touch_variables(bridge_channel->chan, &touch_format,
        &touch_monitor, &touch_monitor_prefix, &touch_monitor_beep);
    switch (set_touch_res) {
    case SET_TOUCH_SUCCESS:
        break;
    case SET_TOUCH_UNSET:
        set_touch_res = set_touch_variables(peer_chan, &touch_format, &touch_monitor,
            &touch_monitor_prefix, &touch_monitor_beep);
        if (set_touch_res == SET_TOUCH_ALLOC_FAILURE) {
            return;
        }
        break;
    case SET_TOUCH_ALLOC_FAILURE:
        return;
    }
 
    if (!ast_strlen_zero(touch_monitor)) {
        len = strlen(touch_monitor) + 50;
        touch_filename = ast_alloca(len);
        snprintf(touch_filename, len, "%s-%ld-%s.%s",
            S_OR(touch_monitor_prefix, "auto"),
            (long) time(NULL),
            touch_monitor,
            S_OR(touch_format, "wav"));
    } else {
        char *caller_chan_id;
        char *peer_chan_id;
 
        caller_chan_id = ast_strdupa(S_COR(ast_channel_caller(bridge_channel->chan)->id.number.valid,
            ast_channel_caller(bridge_channel->chan)->id.number.str, ast_channel_name(bridge_channel->chan)));
        peer_chan_id = ast_strdupa(S_COR(ast_channel_caller(peer_chan)->id.number.valid,
            ast_channel_caller(peer_chan)->id.number.str, ast_channel_name(peer_chan)));
        len = strlen(caller_chan_id) + strlen(peer_chan_id) + 50;
        touch_filename = ast_alloca(len);
        snprintf(touch_filename, len, "%s-%ld-%s-%s.%s",
            S_OR(touch_monitor_prefix, "auto"),
            (long) time(NULL),
            caller_chan_id,
            peer_chan_id,
            S_OR(touch_format, "wav"));
    }
 
    for (x = 0; x < strlen(touch_filename); x++) {
        if (touch_filename[x] == '/') {
            touch_filename[x] = '-';
        }
    }
 
    ast_verb(4, "AutoMixMonitor used to record call. Filename: %s\n", touch_filename);
 
    if (!ast_strlen_zero(touch_monitor_beep)) {
        unsigned int interval = 15;
        if (sscanf(touch_monitor_beep, "%30u", &interval) != 1) {
            ast_log(LOG_WARNING, "Invalid interval '%s' for periodic beep. Using default of %u\n",
                        touch_monitor_beep, interval);
        }
 
        if (interval < 5) {
            interval = 5;
            ast_log(LOG_WARNING, "Interval '%s' too small for periodic beep. Using minimum of %u\n",
                    touch_monitor_beep, interval);
        }
        snprintf(mix_options, sizeof(mix_options), "bB(%d)", interval);
    }
 
    if (ast_start_mixmonitor(peer_chan, touch_filename, mix_options)) {
        ast_verb(4, "AutoMixMonitor feature was tried by '%s' but MixMonitor failed to start.\n",
            ast_channel_name(bridge_channel->chan));
 
        if (features_cfg && !ast_strlen_zero(features_cfg->recordingfailsound)) {
            ast_bridge_channel_queue_playfile(bridge_channel, NULL, features_cfg->recordingfailsound, NULL);
        }
        return;
    }
 
    if (features_cfg && !ast_strlen_zero(features_cfg->courtesytone)) {
        ast_bridge_channel_queue_playfile(bridge_channel, NULL, features_cfg->courtesytone, NULL);
        ast_bridge_channel_write_playfile(bridge_channel, NULL, features_cfg->courtesytone, NULL);
    }
 
    if (!ast_strlen_zero(start_message)) {
        ast_bridge_channel_queue_playfile(bridge_channel, NULL, start_message, NULL);
        ast_bridge_channel_write_playfile(bridge_channel, NULL, start_message, NULL);
    }
 
    pbx_builtin_setvar_helper(bridge_channel->chan, "TOUCH_MIXMONITOR_OUTPUT", touch_filename);
    pbx_builtin_setvar_helper(peer_chan, "TOUCH_MIXMONITOR_OUTPUT", touch_filename);
}
 
static int feature_automixmonitor(struct ast_bridge_channel *bridge_channel, void *hook_pvt)
{
    static const char *mixmonitor_spy_type = "MixMonitor";
    const char *stop_message;
    const char *start_message;
    struct ast_bridge_features_automixmonitor *options = hook_pvt;
    enum ast_bridge_features_monitor start_stop = options ? options->start_stop : AUTO_MONITOR_TOGGLE;
    int is_monitoring;
 
    RAII_VAR(struct ast_channel *, peer_chan, NULL, ast_channel_cleanup);
    RAII_VAR(struct ast_features_general_config *, features_cfg, NULL, ao2_cleanup);
 
    ast_channel_lock(bridge_channel->chan);
    features_cfg = ast_get_chan_features_general_config(bridge_channel->chan);
    ast_channel_unlock(bridge_channel->chan);
    ast_bridge_channel_lock_bridge(bridge_channel);
    peer_chan = ast_bridge_peer_nolock(bridge_channel->bridge, bridge_channel->chan);
    ast_bridge_unlock(bridge_channel->bridge);
 
    if (!peer_chan) {
        ast_verb(4, "Cannot start AutoMixMonitor for %s - cannot determine peer in bridge.\n",
            ast_channel_name(bridge_channel->chan));
        if (features_cfg && !ast_strlen_zero(features_cfg->recordingfailsound)) {
            ast_bridge_channel_queue_playfile(bridge_channel, NULL, features_cfg->recordingfailsound, NULL);
        }
        return 0;
    }
 
    ast_channel_lock(bridge_channel->chan);
    start_message = pbx_builtin_getvar_helper(bridge_channel->chan,
        "TOUCH_MIXMONITOR_MESSAGE_START");
    start_message = ast_strdupa(S_OR(start_message, ""));
    stop_message = pbx_builtin_getvar_helper(bridge_channel->chan,
        "TOUCH_MIXMONITOR_MESSAGE_STOP");
    stop_message = ast_strdupa(S_OR(stop_message, ""));
    ast_channel_unlock(bridge_channel->chan);
 
    is_monitoring =
        0 < ast_channel_audiohook_count_by_source(peer_chan, mixmonitor_spy_type, AST_AUDIOHOOK_TYPE_SPY);
    switch (start_stop) {
    case AUTO_MONITOR_TOGGLE:
        if (is_monitoring) {
            stop_automixmonitor(bridge_channel, peer_chan, features_cfg, stop_message);
        } else {
            start_automixmonitor(bridge_channel, peer_chan, features_cfg, start_message);
        }
        return 0;
    case AUTO_MONITOR_START:
        if (!is_monitoring) {
            start_automixmonitor(bridge_channel, peer_chan, features_cfg, start_message);
            return 0;
        }
        ast_verb(4, "AutoMixMonitor already recording call.\n");
        break;
    case AUTO_MONITOR_STOP:
        if (is_monitoring) {
            stop_automixmonitor(bridge_channel, peer_chan, features_cfg, stop_message);
            return 0;
        }
        ast_verb(4, "AutoMixMonitor already stopped on call.\n");
        break;
    }
 
    /*
     * Fake start/stop to invoker so will think it did something but
     * was already in that mode.
     */
    if (features_cfg && !ast_strlen_zero(features_cfg->courtesytone)) {
        ast_bridge_channel_queue_playfile(bridge_channel, NULL, features_cfg->courtesytone, NULL);
    }
    if (is_monitoring) {
        if (!ast_strlen_zero(start_message)) {
            ast_bridge_channel_queue_playfile(bridge_channel, NULL, start_message, NULL);
        }
    } else {
        if (!ast_strlen_zero(stop_message)) {
            ast_bridge_channel_queue_playfile(bridge_channel, NULL, stop_message, NULL);
        }
    }
    return 0;
}
 
/*! \brief Internal built in feature for hangup */
static int feature_hangup(struct ast_bridge_channel *bridge_channel, void *hook_pvt)
{
    /*
     * This is very simple, we simply change the state on the
     * bridge_channel to force the channel out of the bridge and the
     * core takes care of the rest.
     */
    ast_bridge_channel_leave_bridge(bridge_channel, BRIDGE_CHANNEL_STATE_END,
        AST_CAUSE_NORMAL_CLEARING);
    return 0;
}
 
static int unload_module(void)
{
    ast_bridge_features_unregister(AST_BRIDGE_BUILTIN_HANGUP);
    ast_bridge_features_unregister(AST_BRIDGE_BUILTIN_AUTOMIXMON);
 
    return 0;
}
 
static int load_module(void)
{
    ast_bridge_features_register(AST_BRIDGE_BUILTIN_HANGUP, feature_hangup, NULL);
    ast_bridge_features_register(AST_BRIDGE_BUILTIN_AUTOMIXMON, feature_automixmonitor, NULL);
 
    /* This module cannot be unloaded until shutdown */
    ast_module_shutdown_ref(ast_module_info->self);
 
    return AST_MODULE_LOAD_SUCCESS;
}
 
AST_MODULE_INFO(ASTERISK_GPL_KEY, AST_MODFLAG_DEFAULT, "Built in bridging features",
    .support_level = AST_MODULE_SUPPORT_CORE,
    .load = load_module,
    .unload = unload_module,
);