app_page.c

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/*
 * Asterisk -- An open source telephony toolkit.
 *
 * Copyright (c) 2004 - 2006 Digium, Inc.  All rights reserved.
 *
 * Mark Spencer <markster@digium.com>
 *
 * This code is released under the GNU General Public License
 * version 2.0.  See LICENSE for more information.
 *
 * 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.
 *
 */
 
/*! \file
 *
 * \brief page() - Paging application
 *
 * \author Mark Spencer <markster@digium.com>
 *
 * \ingroup applications
 */
 
/*** MODULEINFO
    <depend>app_confbridge</depend>
    <support_level>core</support_level>
 ***/
 
#include "asterisk.h"
 
#include "asterisk/channel.h"
#include "asterisk/pbx.h"
#include "asterisk/module.h"
#include "asterisk/file.h"
#include "asterisk/app.h"
#include "asterisk/chanvars.h"
#include "asterisk/utils.h"
#include "asterisk/devicestate.h"
#include "asterisk/dial.h"
 
/*** DOCUMENTATION
    <application name="Page" language="en_US">
        <synopsis>
            Page series of phones
        </synopsis>
        <syntax>
            <parameter name="Technology/Resource" required="false" argsep="&amp;">
                <argument name="Technology/Resource" required="true">
                    <para>Specification of the device(s) to dial. These must be in the format of
                    <literal>Technology/Resource</literal>, where <replaceable>Technology</replaceable>
                    represents a particular channel driver, and <replaceable>Resource</replaceable> represents a resource
                    available to that particular channel driver.</para>
                </argument>
                <argument name="Technology2/Resource2" multiple="true">
                    <para>Optional extra devices to dial in parallel</para>
                    <para>If you need more than one, enter them as Technology2/Resource2&amp;
                    Technology3/Resource3&amp;.....</para>
                </argument>
            </parameter>
            <parameter name="options">
                <optionlist>
                <option name="b" argsep="^">
                    <para>Before initiating an outgoing call, Gosub to the specified
                    location using the newly created channel.  The Gosub will be
                    executed for each destination channel.</para>
                    <argument name="context" required="false" />
                    <argument name="exten" required="false" />
                    <argument name="priority" required="true" hasparams="optional" argsep="^">
                        <argument name="arg1" multiple="true" required="true" />
                        <argument name="argN" />
                    </argument>
                </option>
                <option name="B" argsep="^">
                    <para>Before initiating the outgoing call(s), Gosub to the specified
                    location using the current channel.</para>
                    <argument name="context" required="false" />
                    <argument name="exten" required="false" />
                    <argument name="priority" required="true" hasparams="optional" argsep="^">
                        <argument name="arg1" multiple="true" required="true" />
                        <argument name="argN" />
                    </argument>
                </option>
                    <option name="d">
                        <para>Full duplex audio</para>
                    </option>
                    <option name="i">
                        <para>Ignore attempts to forward the call</para>
                    </option>
                    <option name="q">
                        <para>Quiet, do not play beep to caller</para>
                    </option>
                    <option name="r">
                        <para>Record the page into a file (<literal>CONFBRIDGE(bridge,record_conference)</literal>)</para>
                    </option>
                    <option name="s">
                        <para>Only dial a channel if its device state says that it is <literal>NOT_INUSE</literal></para>
                    </option>
                    <option name="A">
                        <argument name="x" required="true">
                            <para>The announcement to playback to all devices</para>
                        </argument>
                        <para>Play an announcement to all paged participants</para>
                    </option>
                    <option name="n">
                        <para>Do not play announcement to caller (alters <literal>A(x)</literal> behavior)</para>
                    </option>
                </optionlist>
            </parameter>
            <parameter name="timeout">
                <para>Specify the length of time that the system will attempt to connect a call.
                After this duration, any page calls that have not been answered will be hung up by the
                system.</para>
            </parameter>
        </syntax>
        <description>
            <para>Places outbound calls to the given <replaceable>technology</replaceable>/<replaceable>resource</replaceable>
            and dumps them into a conference bridge as muted participants. The original
            caller is dumped into the conference as a speaker and the room is
            destroyed when the original caller leaves.</para>
        </description>
        <see-also>
            <ref type="application">ConfBridge</ref>
        </see-also>
    </application>
 ***/
static const char * const app_page= "Page";
 
enum page_opt_flags {
    PAGE_DUPLEX = (1 << 0),
    PAGE_QUIET = (1 << 1),
    PAGE_RECORD = (1 << 2),
    PAGE_SKIP = (1 << 3),
    PAGE_IGNORE_FORWARDS = (1 << 4),
    PAGE_ANNOUNCE = (1 << 5),
    PAGE_NOCALLERANNOUNCE = (1 << 6),
    PAGE_PREDIAL_CALLEE = (1 << 7),
    PAGE_PREDIAL_CALLER = (1 << 8),
};
 
enum {
    OPT_ARG_ANNOUNCE = 0,
    OPT_ARG_PREDIAL_CALLEE = 1,
    OPT_ARG_PREDIAL_CALLER = 2,
    OPT_ARG_ARRAY_SIZE = 3,
};
 
AST_APP_OPTIONS(page_opts, {
    AST_APP_OPTION_ARG('b', PAGE_PREDIAL_CALLEE, OPT_ARG_PREDIAL_CALLEE),
    AST_APP_OPTION_ARG('B', PAGE_PREDIAL_CALLER, OPT_ARG_PREDIAL_CALLER),
    AST_APP_OPTION('d', PAGE_DUPLEX),
    AST_APP_OPTION('q', PAGE_QUIET),
    AST_APP_OPTION('r', PAGE_RECORD),
    AST_APP_OPTION('s', PAGE_SKIP),
    AST_APP_OPTION('i', PAGE_IGNORE_FORWARDS),
    AST_APP_OPTION_ARG('A', PAGE_ANNOUNCE, OPT_ARG_ANNOUNCE),
    AST_APP_OPTION('n', PAGE_NOCALLERANNOUNCE),
});
 
#define PAGE_BEEP "beep"
 
/* We use this structure as a way to pass this to all dialed channels */
struct page_options {
    char *opts[OPT_ARG_ARRAY_SIZE];
    struct ast_flags flags;
};
 
/*!
 * \internal
 * \brief Setup the page bridge profile.
 *
 * \param chan Setup bridge profile on this channel.
 * \param options Options to setup bridge profile.
 */
static void setup_profile_bridge(struct ast_channel *chan, struct page_options *options)
{
    /* Use default_bridge as a starting point */
    ast_func_write(chan, "CONFBRIDGE(bridge,template)", "");
    if (ast_test_flag(&options->flags, PAGE_RECORD)) {
        ast_func_write(chan, "CONFBRIDGE(bridge,record_conference)", "yes");
    }
}
 
/*!
 * \internal
 * \brief Setup the paged user profile.
 *
 * \param chan Setup user profile on this channel.
 * \param options Options to setup paged user profile.
 */
static void setup_profile_paged(struct ast_channel *chan, struct page_options *options)
{
    /* Use default_user as a starting point */
    ast_func_write(chan, "CONFBRIDGE(user,template)", "");
    ast_func_write(chan, "CONFBRIDGE(user,quiet)", "yes");
    ast_func_write(chan, "CONFBRIDGE(user,end_marked)", "yes");
    if (!ast_test_flag(&options->flags, PAGE_DUPLEX)) {
        ast_func_write(chan, "CONFBRIDGE(user,startmuted)", "yes");
    }
    if (ast_test_flag(&options->flags, PAGE_ANNOUNCE)
        && !ast_strlen_zero(options->opts[OPT_ARG_ANNOUNCE])) {
        ast_func_write(chan, "CONFBRIDGE(user,announcement)", options->opts[OPT_ARG_ANNOUNCE]);
    }
}
 
/*!
 * \internal
 * \brief Setup the caller user profile.
 *
 * \param chan Setup user profile on this channel.
 * \param options Options to setup caller user profile.
 */
static void setup_profile_caller(struct ast_channel *chan, struct page_options *options)
{
    /* Use default_user as a starting point if not already setup. */
    ast_func_write(chan, "CONFBRIDGE(user,template)", "");
    ast_func_write(chan, "CONFBRIDGE(user,quiet)", "yes");
    ast_func_write(chan, "CONFBRIDGE(user,marked)", "yes");
    if (!ast_test_flag(&options->flags, PAGE_NOCALLERANNOUNCE)
        && ast_test_flag(&options->flags, PAGE_ANNOUNCE)
        && !ast_strlen_zero(options->opts[OPT_ARG_ANNOUNCE])) {
        ast_func_write(chan, "CONFBRIDGE(user,announcement)", options->opts[OPT_ARG_ANNOUNCE]);
    }
}
 
static void page_state_callback(struct ast_dial *dial)
{
    struct ast_channel *chan;
    struct page_options *options;
 
    if (ast_dial_state(dial) != AST_DIAL_RESULT_ANSWERED ||
        !(chan = ast_dial_answered(dial)) ||
        !(options = ast_dial_get_user_data(dial))) {
        return;
    }
 
    setup_profile_bridge(chan, options);
    setup_profile_paged(chan, options);
}
 
static int page_exec(struct ast_channel *chan, const char *data)
{
    char *tech;
    char *resource;
    char *tmp;
    char *predial_callee = NULL;
    char confbridgeopts[128];
    char originator[AST_CHANNEL_NAME];
    struct page_options options = { { 0, }, { 0, } };
    unsigned int confid = ast_random();
    struct ast_app *app;
    int res = 0;
    int pos = 0;
    int i = 0;
    struct ast_dial **dial_list;
    unsigned int num_dials;
    int timeout = 0;
    char *parse;
 
    AST_DECLARE_APP_ARGS(args,
        AST_APP_ARG(devices);
        AST_APP_ARG(options);
        AST_APP_ARG(timeout);
    );
 
    if (!(app = pbx_findapp("ConfBridge"))) {
        ast_log(LOG_WARNING, "There is no ConfBridge application available!\n");
        return -1;
    };
 
    parse = ast_strdupa(data ?: "");
 
    AST_STANDARD_APP_ARGS(args, parse);
 
    ast_copy_string(originator, ast_channel_name(chan), sizeof(originator));
    if ((tmp = strchr(originator, '-'))) {
        *tmp = '\0';
    }
 
    if (!ast_strlen_zero(args.options)) {
        ast_app_parse_options(page_opts, &options.flags, options.opts, args.options);
    }
 
    if (!ast_strlen_zero(args.timeout)) {
        timeout = atoi(args.timeout);
    }
 
    snprintf(confbridgeopts, sizeof(confbridgeopts), "ConfBridge,%u", confid);
 
    /* Count number of extensions in list by number of ampersands + 1 */
    num_dials = 1;
    tmp = args.devices ?: "";
    while (*tmp) {
        if (*tmp == '&') {
            num_dials++;
        }
        tmp++;
    }
 
    if (!(dial_list = ast_calloc(num_dials, sizeof(struct ast_dial *)))) {
        ast_log(LOG_ERROR, "Can't allocate %ld bytes for dial list\n", (long)(sizeof(struct ast_dial *) * num_dials));
        return -1;
    }
 
    /* PREDIAL: Preprocess any callee gosub arguments. */
    if (ast_test_flag(&options.flags, PAGE_PREDIAL_CALLEE)
        && !ast_strlen_zero(options.opts[OPT_ARG_PREDIAL_CALLEE])) {
        ast_replace_subargument_delimiter(options.opts[OPT_ARG_PREDIAL_CALLEE]);
        predial_callee =
            (char *) ast_app_expand_sub_args(chan, options.opts[OPT_ARG_PREDIAL_CALLEE]);
    }
 
    /* PREDIAL: Run gosub on the caller's channel */
    if (ast_test_flag(&options.flags, PAGE_PREDIAL_CALLER)
        && !ast_strlen_zero(options.opts[OPT_ARG_PREDIAL_CALLER])) {
        ast_replace_subargument_delimiter(options.opts[OPT_ARG_PREDIAL_CALLER]);
        ast_app_exec_sub(NULL, chan, options.opts[OPT_ARG_PREDIAL_CALLER], 0);
    }
 
    /* Go through parsing/calling each device */
    while ((tech = strsep(&args.devices, "&"))) {
        int state = 0;
        struct ast_dial *dial = NULL;
 
        tech = ast_strip(tech);
        if (ast_strlen_zero(tech)) {
            /* No tech/resource in this position. */
            continue;
        }
 
        /* don't call the originating device */
        if (!strcasecmp(tech, originator)) {
            continue;
        }
 
        /* If no resource is available, continue on */
        if (!(resource = strchr(tech, '/'))) {
            ast_log(LOG_WARNING, "Incomplete destination: '%s' supplied.\n", tech);
            continue;
        }
 
        /* Ensure device is not in use if skip option is enabled */
        if (ast_test_flag(&options.flags, PAGE_SKIP)) {
            state = ast_device_state(tech);
            if (state == AST_DEVICE_UNKNOWN) {
                ast_verb(3, "Destination '%s' has device state '%s'. Paging anyway.\n",
                    tech, ast_devstate2str(state));
            } else if (state != AST_DEVICE_NOT_INUSE) {
                ast_verb(3, "Destination '%s' has device state '%s'.\n",
                    tech, ast_devstate2str(state));
                continue;
            }
        }
 
        *resource++ = '\0';
 
        /* Create a dialing structure */
        if (!(dial = ast_dial_create())) {
            ast_log(LOG_WARNING, "Failed to create dialing structure.\n");
            continue;
        }
 
        /* Append technology and resource */
        if (ast_dial_append(dial, tech, resource, NULL) == -1) {
            ast_log(LOG_ERROR, "Failed to add %s/%s to outbound dial\n", tech, resource);
            ast_dial_destroy(dial);
            continue;
        }
 
        /* Set ANSWER_EXEC as global option */
        ast_dial_option_global_enable(dial, AST_DIAL_OPTION_ANSWER_EXEC, confbridgeopts);
 
        if (predial_callee) {
            ast_dial_option_global_enable(dial, AST_DIAL_OPTION_PREDIAL, predial_callee);
        }
 
        if (timeout) {
            ast_dial_set_global_timeout(dial, timeout * 1000);
        }
 
        if (ast_test_flag(&options.flags, PAGE_IGNORE_FORWARDS)) {
            ast_dial_option_global_enable(dial, AST_DIAL_OPTION_DISABLE_CALL_FORWARDING, NULL);
        }
 
        ast_dial_set_state_callback(dial, &page_state_callback);
        ast_dial_set_user_data(dial, &options);
 
        /* Run this dial in async mode */
        ast_dial_run(dial, chan, 1);
 
        /* Put in our dialing array */
        dial_list[pos++] = dial;
    }
 
    ast_free(predial_callee);
 
    if (!ast_test_flag(&options.flags, PAGE_QUIET)) {
        if (!ast_fileexists(PAGE_BEEP, NULL, NULL)) {
            ast_log(LOG_WARNING, "Missing required sound file: '" PAGE_BEEP "'\n");
        } else {
            res = ast_streamfile(chan, PAGE_BEEP, ast_channel_language(chan));
            if (!res) {
                res = ast_waitstream(chan, "");
            }
        }
    }
 
    if (!res) {
        setup_profile_bridge(chan, &options);
        setup_profile_caller(chan, &options);
 
        snprintf(confbridgeopts, sizeof(confbridgeopts), "%u", confid);
        pbx_exec(chan, app, confbridgeopts);
    }
 
    /* Go through each dial attempt cancelling, joining, and destroying */
    for (i = 0; i < pos; i++) {
        struct ast_dial *dial = dial_list[i];
 
        /* We have to wait for the async thread to exit as it's possible ConfBridge won't throw them out immediately */
        ast_dial_join(dial);
 
        /* Hangup all channels */
        ast_dial_hangup(dial);
 
        /* Destroy dialing structure */
        ast_dial_destroy(dial);
    }
 
    ast_free(dial_list);
 
    return -1;
}
 
static int unload_module(void)
{
    return ast_unregister_application(app_page);
}
 
static int load_module(void)
{
    return ast_register_application_xml(app_page, page_exec);
}
 
AST_MODULE_INFO(ASTERISK_GPL_KEY, AST_MODFLAG_DEFAULT, "Page Multiple Phones",
    .support_level = AST_MODULE_SUPPORT_CORE,
    .load = load_module,
    .unload = unload_module,
    .requires = "app_confbridge",
);