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00026 #include <stdlib.h>
00027 #include <stdio.h>
00028 #include <string.h>
00029 #include <unistd.h>
00030 #include <errno.h>
00031 #include <sys/ioctl.h>
00032
00033 #include "asterisk.h"
00034
00035 ASTERISK_FILE_VERSION(__FILE__, "$Revision: 7221 $")
00036
00037 #include "asterisk/lock.h"
00038 #include "asterisk/file.h"
00039 #include "asterisk/logger.h"
00040 #include "asterisk/channel.h"
00041 #include "asterisk/pbx.h"
00042 #include "asterisk/module.h"
00043 #include "asterisk/app.h"
00044 #include "asterisk/devicestate.h"
00045 #include "asterisk/options.h"
00046
00047 static char *tdesc = "Check channel availability";
00048
00049 static char *app = "ChanIsAvail";
00050
00051 static char *synopsis = "Check channel availability";
00052
00053 static char *descrip =
00054 " ChanIsAvail(Technology/resource[&Technology2/resource2...][|options]): \n"
00055 "This application will check to see if any of the specified channels are\n"
00056 "available. The following variables will be set by this application:\n"
00057 " ${AVAILCHAN} - the name of the available channel, if one exists\n"
00058 " ${AVAILORIGCHAN} - the canonical channel name that was used to create the channel\n"
00059 " ${AVAILSTATUS} - the status code for the available channel\n"
00060 " Options:\n"
00061 " s - Consider the channel unavailable if the channel is in use at all\n"
00062 " j - Support jumping to priority n+101 if no channel is available\n";
00063
00064 STANDARD_LOCAL_USER;
00065
00066 LOCAL_USER_DECL;
00067
00068 static int chanavail_exec(struct ast_channel *chan, void *data)
00069 {
00070 int res=-1, inuse=-1, option_state=0, priority_jump=0;
00071 int status;
00072 struct localuser *u;
00073 char *info, tmp[512], trychan[512], *peers, *tech, *number, *rest, *cur, *options, *stringp;
00074 struct ast_channel *tempchan;
00075
00076 if (ast_strlen_zero(data)) {
00077 ast_log(LOG_WARNING, "ChanIsAvail requires an argument (Zap/1&Zap/2)\n");
00078 return -1;
00079 }
00080
00081 LOCAL_USER_ADD(u);
00082
00083 info = ast_strdupa(data);
00084 stringp = info;
00085 strsep(&stringp, "|");
00086 options = strsep(&stringp, "|");
00087 if (options) {
00088 if (strchr(options, 's'))
00089 option_state = 1;
00090 if (strchr(options, 'j'))
00091 priority_jump = 1;
00092 }
00093 peers = info;
00094 if (peers) {
00095 cur = peers;
00096 do {
00097
00098 rest = strchr(cur, '&');
00099 if (rest) {
00100 *rest = 0;
00101 rest++;
00102 }
00103 tech = cur;
00104 number = strchr(tech, '/');
00105 if (!number) {
00106 ast_log(LOG_WARNING, "ChanIsAvail argument takes format ([technology]/[device])\n");
00107 LOCAL_USER_REMOVE(u);
00108 return -1;
00109 }
00110 *number = '\0';
00111 number++;
00112
00113 if (option_state) {
00114
00115
00116
00117
00118 snprintf(trychan, sizeof(trychan), "%s/%s",cur,number);
00119 status = inuse = ast_device_state(trychan);
00120 }
00121 if ((inuse <= 1) && (tempchan = ast_request(tech, chan->nativeformats, number, &status))) {
00122 pbx_builtin_setvar_helper(chan, "AVAILCHAN", tempchan->name);
00123
00124 snprintf(tmp, sizeof(tmp), "%s/%s", tech, number);
00125 pbx_builtin_setvar_helper(chan, "AVAILORIGCHAN", tmp);
00126 snprintf(tmp, sizeof(tmp), "%d", status);
00127 pbx_builtin_setvar_helper(chan, "AVAILSTATUS", tmp);
00128 ast_hangup(tempchan);
00129 tempchan = NULL;
00130 res = 1;
00131 break;
00132 } else {
00133 snprintf(tmp, sizeof(tmp), "%d", status);
00134 pbx_builtin_setvar_helper(chan, "AVAILSTATUS", tmp);
00135 }
00136 cur = rest;
00137 } while (cur);
00138 }
00139 if (res < 1) {
00140 pbx_builtin_setvar_helper(chan, "AVAILCHAN", "");
00141 pbx_builtin_setvar_helper(chan, "AVAILORIGCHAN", "");
00142 if (priority_jump || option_priority_jumping) {
00143 if (ast_goto_if_exists(chan, chan->context, chan->exten, chan->priority + 101)) {
00144 LOCAL_USER_REMOVE(u);
00145 return -1;
00146 }
00147 }
00148 }
00149
00150 LOCAL_USER_REMOVE(u);
00151 return 0;
00152 }
00153
00154 int unload_module(void)
00155 {
00156 int res = 0;
00157
00158 res = ast_unregister_application(app);
00159
00160 STANDARD_HANGUP_LOCALUSERS;
00161
00162 return res;
00163 }
00164
00165 int load_module(void)
00166 {
00167 return ast_register_application(app, chanavail_exec, synopsis, descrip);
00168 }
00169
00170 char *description(void)
00171 {
00172 return tdesc;
00173 }
00174
00175 int usecount(void)
00176 {
00177 int res;
00178 STANDARD_USECOUNT(res);
00179 return res;
00180 }
00181
00182 char *key()
00183 {
00184 return ASTERISK_GPL_KEY;
00185 }