funcs/func_dialplan.c

   1 /*
   2  * Asterisk -- An open source telephony toolkit.
   3  *
   4  * Copyright (C) 2007, Digium, Inc.
   5  *
   6  * See http://www.asterisk.org for more information about
   7  * the Asterisk project. Please do not directly contact
   8  * any of the maintainers of this project for assistance;
   9  * the project provides a web site, mailing lists and IRC
  10  * channels for your use.
  11  *
  12  * This program is free software, distributed under the terms of
  13  * the GNU General Public License Version 2. See the LICENSE file
  14  * at the top of the source tree.
  15  */
  16
  17 /*! \file
  18  *
  19  * \brief Dialplan group functions check if a dialplan entry exists
  20  *
  21  * \author Gregory Nietsky AKA irroot <gregory@networksentry.co.za>
  22  * \author Russell Bryant <russell@digium.com>
  23  *
  24  * \ingroup functions
  25  */
  26
  27 #include "asterisk.h"
  28
  29 ASTERISK_FILE_VERSION(__FILE__, "$Revision$")
  30
  31 #include "asterisk/module.h"
  32 #include "asterisk/channel.h"
  33 #include "asterisk/pbx.h"
  34 #include "asterisk/app.h"
  35
  36 static int isexten_function_read(struct ast_channel *chan, const char *cmd, char *data,
  37         char *buf, size_t len)
  38 {
  39         char *parse;
  40         AST_DECLARE_APP_ARGS(args,
  41                 AST_APP_ARG(context);
  42                 AST_APP_ARG(exten);
  43                 AST_APP_ARG(priority);
  44         );
  45
  46         strcpy(buf, "0");
  47
  48         if (ast_strlen_zero(data)) {
  49                 ast_log(LOG_ERROR, "DIALPLAN_EXISTS() requires an argument\n");
  50                 return -1;
  51         }
  52
  53         parse = ast_strdupa(data);
  54         AST_STANDARD_APP_ARGS(args, parse);
  55
  56         if (!ast_strlen_zero(args.priority)) {
  57                 int priority_num;
  58                 if (sscanf(args.priority, "%d", &priority_num) == 1 && priority_num > 0) {
  59                         int res;
  60                         res = ast_exists_extension(chan, args.context, args.exten, priority_num,
  61                                 chan->cid.cid_num);
  62                         if (res)
  63                                 strcpy(buf, "1");
  64                 } else {
  65                         int res;
  66                         res = ast_findlabel_extension(chan, args.context, args.exten,
  67                                 args.priority, chan->cid.cid_num);
  68                         if (res > 0)
  69                                 strcpy(buf, "1");
  70                 }
  71         } else if (!ast_strlen_zero(args.exten)) {
  72                 int res;
  73                 res = ast_exists_extension(chan, args.context, args.exten, 1,
  74                         chan->cid.cid_num);
  75                 if (res)
  76                         strcpy(buf, "1");
  77         } else if (!ast_strlen_zero(args.context)) {
  78                 if (ast_context_find(args.context))
  79                         strcpy(buf, "1");
  80         } else {
  81                 ast_log(LOG_ERROR, "Invalid arguments provided to DIALPLAN_EXISTS\n");
  82                 return -1;
  83         }
  84
  85         return 0;
  86 }
  87
  88 static struct ast_custom_function isexten_function = {
  89         .name = "DIALPLAN_EXISTS",
  90         .syntax = "DIALPLAN_EXISTS(context[,extension[,priority]])",
  91         .synopsis = "Checks the existence of a dialplan target.",
  92         .desc = "This function returns 1 if the target exits.  Otherwise, it returns 0.\n",
  93         .read = isexten_function_read,
  94 };
  95
  96 static int unload_module(void)
  97 {
  98         return ast_custom_function_unregister(&isexten_function);
  99 }
 100
 101 static int load_module(void)
 102 {
 103         return ast_custom_function_register(&isexten_function);
 104 }
 105
 106 AST_MODULE_INFO_STANDARD(ASTERISK_GPL_KEY, "Dialplan Context/Extension/Priority Checking Functions");