apps/app_chanisavail.c

   1 /*
   2  * Asterisk -- A telephony toolkit for Linux.
   3  *
   4  * Check if Channel is Available
   5  *
   6  * Copyright (C) 2003, Digium
   7  *
   8  * Mark Spencer <markster@digium.com>
   9  * James Golovich <james@gnuinter.net>
  10  *
  11  * This program is free software, distributed under the terms of
  12  * the GNU General Public License
  13  *
  14  */
  15
  16 #include <asterisk/lock.h>
  17 #include <asterisk/file.h>
  18 #include <asterisk/logger.h>
  19 #include <asterisk/channel.h>
  20 #include <asterisk/pbx.h>
  21 #include <asterisk/module.h>
  22 #include <asterisk/app.h>
  23 #include <stdlib.h>
  24 #include <unistd.h>
  25 #include <errno.h>
  26 #include <string.h>
  27 #include <stdlib.h>
  28 #include <sys/ioctl.h>
  29
  30 #include <pthread.h>
  31
  32 static char *tdesc = "Check if channel is available";
  33
  34 static char *app = "ChanIsAvail";
  35
  36 static char *synopsis = "Check if channel is available";
  37
  38 static char *descrip =
  39 "  ChanIsAvail(Technology/resource[&Technology2/resource2...]): \n"
  40 "Checks is any of the requested channels are available.  If none\n"
  41 "of the requested channels are available the new priority will\n"
  42 "be n+101 (unless such a priority does not exist, in which case\n"
  43 "ChanIsAvail will return -1.  If any of the requested channels\n"
  44 "are available, the next priority will be n+1, the channel variable\n"
  45 "${AVAILCHAN} will be set to the name of the available channel and\n"
  46 "the ChanIsAvail app will return 0.\n";
  47
  48 STANDARD_LOCAL_USER;
  49
  50 LOCAL_USER_DECL;
  51
  52 static int chanavail_exec(struct ast_channel *chan, void *data)
  53 {
  54         int res=-1;
  55         struct localuser *u;
  56         char info[256], *peers, *tech, *number, *rest, *cur;
  57         struct ast_channel *tempchan;
  58
  59         if (!data) {
  60                 ast_log(LOG_WARNING, "ChanIsAvail requires an argument (Zap/1&Zap/2)\n");
  61                 return -1;
  62         }
  63         LOCAL_USER_ADD(u);
  64
  65         strncpy(info, (char *)data, strlen((char *)data) + AST_MAX_EXTENSION-1);
  66         peers = info;
  67         if (peers) {
  68                 cur = peers;
  69                 do {
  70                         /* remember where to start next time */
  71                         rest = strchr(cur, '&');
  72                         if (rest) {
  73                                 *rest = 0;
  74                                 rest++;
  75                         }
  76                         tech = cur;
  77                         number = strchr(tech, '/');
  78                         if (!number) {
  79                                 ast_log(LOG_WARNING, "ChanIsAvail argument takes format ([technology]/[device])\n");
  80                                 return -1;
  81                         }
  82                         *number = '\0';
  83                         number++;
  84                         if ((tempchan = ast_request(tech, chan->nativeformats, number))) {
  85                                         pbx_builtin_setvar_helper(chan, "AVAILCHAN", tempchan->name);
  86                                         ast_hangup(tempchan);
  87                                         tempchan = NULL;
  88                                         res = 1;
  89                                         break;
  90                         }
  91                         cur = rest;
  92                 } while (cur);
  93         }
  94
  95         if (res < 1) {
  96                 pbx_builtin_setvar_helper(chan, "AVAILCHAN", "");
  97                 if (ast_exists_extension(chan, chan->context, chan->exten, chan->priority + 101, chan->callerid))
  98                         chan->priority+=100;
  99                 else
 100                         return -1;
 101         }
 102
 103         LOCAL_USER_REMOVE(u);
 104         return 0;
 105 }
 106
 107 int unload_module(void)
 108 {
 109         STANDARD_HANGUP_LOCALUSERS;
 110         return ast_unregister_application(app);
 111 }
 112
 113 int load_module(void)
 114 {
 115         return ast_register_application(app, chanavail_exec, synopsis, descrip);
 116 }
 117
 118 char *description(void)
 119 {
 120         return tdesc;
 121 }
 122
 123 int usecount(void)
 124 {
 125         int res;
 126         STANDARD_USECOUNT(res);
 127         return res;
 128 }
 129
 130 char *key()
 131 {
 132         return ASTERISK_GPL_KEY;
 133 }