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00030 #include "asterisk.h"
00031
00032 ASTERISK_FILE_VERSION(__FILE__, "$Revision: 229965 $")
00033
00034 #include <stdlib.h>
00035 #include <stdio.h>
00036 #include <string.h>
00037 #include <unistd.h>
00038 #include <errno.h>
00039 #include <sys/ioctl.h>
00040
00041 #include "asterisk/lock.h"
00042 #include "asterisk/file.h"
00043 #include "asterisk/logger.h"
00044 #include "asterisk/channel.h"
00045 #include "asterisk/pbx.h"
00046 #include "asterisk/module.h"
00047 #include "asterisk/app.h"
00048 #include "asterisk/devicestate.h"
00049 #include "asterisk/options.h"
00050
00051 static char *app = "ChanIsAvail";
00052
00053 static char *synopsis = "Check channel availability";
00054
00055 static char *descrip =
00056 " ChanIsAvail(Technology/resource[&Technology2/resource2...][|options]): \n"
00057 "This application will check to see if any of the specified channels are\n"
00058 "available. Note that the AVAILSTATUS variable is used for both device state\n"
00059 "and cause code. It is therefore possible for it to give a value that may\n"
00060 "indicate a device is available when it is not. It is suggested that the\n"
00061 "AVAILORIGCHAN variable is used instead to see whether a device is available\n"
00062 "or not.\n"
00063 "The following variables will be set by this application:\n"
00064 " ${AVAILCHAN} - the name of the available channel, if one exists\n"
00065 " ${AVAILORIGCHAN} - the canonical channel name that was used to create the channel\n"
00066 " ${AVAILSTATUS} - the status code for the available channel\n"
00067 " Options:\n"
00068 " s - Consider the channel unavailable if the channel is in use at all\n"
00069 " j - Support jumping to priority n+101 if no channel is available\n";
00070
00071
00072 static int chanavail_exec(struct ast_channel *chan, void *data)
00073 {
00074 int res=-1, inuse=-1, option_state=0, priority_jump=0;
00075 int status;
00076 struct ast_module_user *u;
00077 char *info, tmp[512], trychan[512], *peers, *tech, *number, *rest, *cur;
00078 struct ast_channel *tempchan;
00079 AST_DECLARE_APP_ARGS(args,
00080 AST_APP_ARG(reqchans);
00081 AST_APP_ARG(options);
00082 );
00083
00084 if (ast_strlen_zero(data)) {
00085 ast_log(LOG_WARNING, "ChanIsAvail requires an argument (Zap/1&Zap/2)\n");
00086 return -1;
00087 }
00088
00089 u = ast_module_user_add(chan);
00090
00091 info = ast_strdupa(data);
00092
00093 AST_STANDARD_APP_ARGS(args, info);
00094
00095 if (args.options) {
00096 if (strchr(args.options, 's'))
00097 option_state = 1;
00098 if (strchr(args.options, 'j'))
00099 priority_jump = 1;
00100 }
00101 peers = args.reqchans;
00102 if (peers) {
00103 cur = peers;
00104 do {
00105
00106 rest = strchr(cur, '&');
00107 if (rest) {
00108 *rest = 0;
00109 rest++;
00110 }
00111 tech = cur;
00112 number = strchr(tech, '/');
00113 if (!number) {
00114 ast_log(LOG_WARNING, "ChanIsAvail argument takes format ([technology]/[device])\n");
00115 ast_module_user_remove(u);
00116 return -1;
00117 }
00118 *number = '\0';
00119 number++;
00120
00121 if (option_state) {
00122
00123
00124
00125
00126 snprintf(trychan, sizeof(trychan), "%s/%s",cur,number);
00127 status = inuse = ast_device_state(trychan);
00128 }
00129 if ((inuse <= 1) && (tempchan = ast_request(tech, chan->nativeformats, number, &status))) {
00130 pbx_builtin_setvar_helper(chan, "AVAILCHAN", tempchan->name);
00131
00132 snprintf(tmp, sizeof(tmp), "%s/%s", tech, number);
00133 pbx_builtin_setvar_helper(chan, "AVAILORIGCHAN", tmp);
00134 snprintf(tmp, sizeof(tmp), "%d", status);
00135 pbx_builtin_setvar_helper(chan, "AVAILSTATUS", tmp);
00136 ast_hangup(tempchan);
00137 tempchan = NULL;
00138 res = 1;
00139 break;
00140 } else {
00141 snprintf(tmp, sizeof(tmp), "%d", status);
00142 pbx_builtin_setvar_helper(chan, "AVAILSTATUS", tmp);
00143 }
00144 cur = rest;
00145 } while (cur);
00146 }
00147 if (res < 1) {
00148 pbx_builtin_setvar_helper(chan, "AVAILCHAN", "");
00149 pbx_builtin_setvar_helper(chan, "AVAILORIGCHAN", "");
00150 if (priority_jump || ast_opt_priority_jumping) {
00151 if (ast_goto_if_exists(chan, chan->context, chan->exten, chan->priority + 101)) {
00152 ast_module_user_remove(u);
00153 return -1;
00154 }
00155 }
00156 }
00157
00158 ast_module_user_remove(u);
00159 return 0;
00160 }
00161
00162 static int unload_module(void)
00163 {
00164 int res = 0;
00165
00166 res = ast_unregister_application(app);
00167
00168 ast_module_user_hangup_all();
00169
00170 return res;
00171 }
00172
00173 static int load_module(void)
00174 {
00175 return ast_register_application(app, chanavail_exec, synopsis, descrip);
00176 }
00177
00178 AST_MODULE_INFO_STANDARD(ASTERISK_GPL_KEY, "Check channel availability");