func_dialplan.c

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/*
 * Asterisk -- An open source telephony toolkit.
 *
 * Copyright (C) 2007, Digium, Inc.
 *
 * 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 Dialplan group functions check if a dialplan entry exists
 *
 * \author Gregory Nietsky AKA irroot <gregory@networksentry.co.za>
 * \author Russell Bryant <russell@digium.com>
 *
 * \ingroup functions
 */
 
/*** MODULEINFO
    <support_level>core</support_level>
 ***/
 
#include "asterisk.h"
 
#include "asterisk/module.h"
#include "asterisk/channel.h"
#include "asterisk/pbx.h"
#include "asterisk/app.h"
 
/*** DOCUMENTATION
    <function name="DIALPLAN_EXISTS" language="en_US">
        <since>
            <version>1.6.0</version>
        </since>
        <synopsis>
            Checks the existence of a dialplan target.
        </synopsis>
        <syntax>
            <parameter name="context" required="true" />
            <parameter name="extension" />
            <parameter name="priority" />
        </syntax>
        <description>
            <para>This function returns <literal>1</literal> if the target exits. Otherwise, it returns <literal>0</literal>.</para>
        </description>
    </function>
 ***/
 
static int isexten_function_read(struct ast_channel *chan, const char *cmd, char *data,
    char *buf, size_t len)
{
    char *parse;
    AST_DECLARE_APP_ARGS(args,
        AST_APP_ARG(context);
        AST_APP_ARG(exten);
        AST_APP_ARG(priority);
    );
 
    strcpy(buf, "0");
 
    if (ast_strlen_zero(data)) {
        ast_log(LOG_ERROR, "DIALPLAN_EXISTS() requires an argument\n");
        return -1;
    }
 
    parse = ast_strdupa(data);
    AST_STANDARD_APP_ARGS(args, parse);
 
    if (!ast_strlen_zero(args.priority)) {
        int priority_num;
        if (sscanf(args.priority, "%30d", &priority_num) == 1 && priority_num > 0) {
            int res;
            res = ast_exists_extension(chan, args.context, args.exten, priority_num,
                !chan ? NULL :
                S_COR(ast_channel_caller(chan)->id.number.valid, ast_channel_caller(chan)->id.number.str, NULL));
            if (res)
                strcpy(buf, "1");
        } else {
            int res;
            res = ast_findlabel_extension(chan, args.context, args.exten, args.priority,
                !chan ? NULL :
                S_COR(ast_channel_caller(chan)->id.number.valid, ast_channel_caller(chan)->id.number.str, NULL));
            if (res > 0)
                strcpy(buf, "1");
        }
    } else if (!ast_strlen_zero(args.exten)) {
        int res;
        res = ast_exists_extension(chan, args.context, args.exten, 1,
            !chan ? NULL :
            S_COR(ast_channel_caller(chan)->id.number.valid, ast_channel_caller(chan)->id.number.str, NULL));
        if (res)
            strcpy(buf, "1");
    } else if (!ast_strlen_zero(args.context)) {
        if (ast_context_find(args.context))
            strcpy(buf, "1");
    } else {
        ast_log(LOG_ERROR, "Invalid arguments provided to DIALPLAN_EXISTS\n");
        return -1;
    }
 
    return 0;
}
 
static struct ast_custom_function isexten_function = {
    .name = "DIALPLAN_EXISTS",
    .read = isexten_function_read,
    .read_max = 2,
};
 
static int unload_module(void)
{
    return ast_custom_function_unregister(&isexten_function);
}
 
static int load_module(void)
{
    return ast_custom_function_register(&isexten_function);
}
 
AST_MODULE_INFO(ASTERISK_GPL_KEY, AST_MODFLAG_LOAD_ORDER, "Dialplan Context/Extension/Priority Checking Functions",
    .support_level = AST_MODULE_SUPPORT_CORE,
    .load = load_module,
    .unload = unload_module,
    .load_pri = AST_MODPRI_APP_DEPEND,
);