app_chanisavail.c File Reference

Check if Channel is Available. More...

#include "asterisk.h"
#include <sys/ioctl.h>
#include "asterisk/lock.h"
#include "asterisk/file.h"
#include "asterisk/channel.h"
#include "asterisk/pbx.h"
#include "asterisk/module.h"
#include "asterisk/app.h"
#include "asterisk/devicestate.h"

Include dependency graph for app_chanisavail.c:

Go to the source code of this file.

Functions

 AST_MODULE_INFO_STANDARD_EXTENDED (ASTERISK_GPL_KEY,"Check channel availability")
static int chanavail_exec (struct ast_channel *chan, const char *data)
static int load_module (void)
static int unload_module (void)

Variables

static const char app [] = "ChanIsAvail"


Detailed Description

Check if Channel is Available.

Author:
Mark Spencer <markster@digium.com>

James Golovich <james@gnuinter.net>

Definition in file app_chanisavail.c.


Function Documentation

AST_MODULE_INFO_STANDARD_EXTENDED ( ASTERISK_GPL_KEY  ,
"Check channel availability"   
)

static int chanavail_exec ( struct ast_channel chan,
const char *  data 
) [static]

Definition at line 102 of file app_chanisavail.c.

References args, AST_APP_ARG, ast_channel_name(), ast_channel_nativeformats(), AST_DECLARE_APP_ARGS, AST_DEVICE_UNKNOWN, ast_hangup(), ast_log, ast_parse_device_state(), ast_request(), AST_STANDARD_APP_ARGS, ast_str_alloca, ast_str_append(), ast_str_buffer(), ast_str_strlen(), ast_strdupa, ast_strlen_zero, LOG_WARNING, NULL, pbx_builtin_setvar_helper(), status, and tmp().

Referenced by load_module().

00103 {
00104    int inuse=-1, option_state=0, string_compare=0, option_all_avail=0;
00105    int status;
00106    char *info, tmp[512], trychan[512], *peers, *tech, *number, *rest, *cur;
00107    struct ast_str *tmp_availchan = ast_str_alloca(2048);
00108    struct ast_str *tmp_availorig = ast_str_alloca(2048);
00109    struct ast_str *tmp_availstat = ast_str_alloca(2048);
00110    struct ast_str *tmp_availcause = ast_str_alloca(2048);
00111    struct ast_channel *tempchan;
00112    AST_DECLARE_APP_ARGS(args,
00113       AST_APP_ARG(reqchans);
00114       AST_APP_ARG(options);
00115    );
00116 
00117    if (ast_strlen_zero(data)) {
00118       ast_log(LOG_WARNING, "ChanIsAvail requires an argument (DAHDI/1&DAHDI/2)\n");
00119       return -1;
00120    }
00121 
00122    info = ast_strdupa(data);
00123 
00124    AST_STANDARD_APP_ARGS(args, info);
00125 
00126    if (args.options) {
00127       if (strchr(args.options, 'a')) {
00128          option_all_avail = 1;
00129       }
00130       if (strchr(args.options, 's')) {
00131          option_state = 1;
00132       }
00133       if (strchr(args.options, 't')) {
00134          string_compare = 1;
00135       }
00136    }
00137    peers = args.reqchans;
00138    if (peers) {
00139       cur = peers;
00140       do {
00141          /* remember where to start next time */
00142          rest = strchr(cur, '&');
00143          if (rest) {
00144             *rest = 0;
00145             rest++;
00146          }
00147          tech = cur;
00148          number = strchr(tech, '/');
00149          if (!number) {
00150             ast_log(LOG_WARNING, "ChanIsAvail argument takes format ([technology]/[device])\n");
00151             return -1;
00152          }
00153          *number = '\0';
00154          number++;
00155 
00156          status = AST_DEVICE_UNKNOWN;
00157 
00158          if (string_compare) {
00159             /* ast_parse_device_state checks for "SIP/1234" as a channel name.
00160                ast_device_state will ask the SIP driver for the channel state. */
00161 
00162             snprintf(trychan, sizeof(trychan), "%s/%s",cur,number);
00163             status = inuse = ast_parse_device_state(trychan);
00164          } else if (option_state) {
00165             /* If the pbx says in use then don't bother trying further.
00166                This is to permit testing if someone's on a call, even if the
00167                channel can permit more calls (ie callwaiting, sip calls, etc).  */
00168 
00169             snprintf(trychan, sizeof(trychan), "%s/%s",cur,number);
00170             status = inuse = ast_device_state(trychan);
00171          }
00172          snprintf(tmp, sizeof(tmp), "%d", status);
00173          ast_str_append(&tmp_availstat, 0, "%s%s", ast_str_strlen(tmp_availstat) ? "&" : "", tmp);
00174          if ((inuse <= 1) && (tempchan = ast_request(tech, ast_channel_nativeformats(chan), NULL, chan, number, &status))) {
00175                ast_str_append(&tmp_availchan, 0, "%s%s", ast_str_strlen(tmp_availchan) ? "&" : "", ast_channel_name(tempchan));
00176                
00177                snprintf(tmp, sizeof(tmp), "%s/%s", tech, number);
00178                ast_str_append(&tmp_availorig, 0, "%s%s", ast_str_strlen(tmp_availorig) ? "&" : "", tmp);
00179 
00180                snprintf(tmp, sizeof(tmp), "%d", status);
00181                ast_str_append(&tmp_availcause, 0, "%s%s", ast_str_strlen(tmp_availcause) ? "&" : "", tmp);
00182 
00183                ast_hangup(tempchan);
00184                tempchan = NULL;
00185 
00186                if (!option_all_avail) {
00187                   break;
00188                }
00189          }
00190          cur = rest;
00191       } while (cur);
00192    }
00193 
00194    pbx_builtin_setvar_helper(chan, "AVAILCHAN", ast_str_buffer(tmp_availchan));
00195    /* Store the originally used channel too */
00196    pbx_builtin_setvar_helper(chan, "AVAILORIGCHAN", ast_str_buffer(tmp_availorig));
00197    pbx_builtin_setvar_helper(chan, "AVAILSTATUS", ast_str_buffer(tmp_availstat));
00198    pbx_builtin_setvar_helper(chan, "AVAILCAUSECODE", ast_str_buffer(tmp_availcause));
00199 
00200    return 0;
00201 }

static int load_module ( void   )  [static]

static int unload_module ( void   )  [static]

Definition at line 203 of file app_chanisavail.c.

References ast_unregister_application().

00204 {
00205    return ast_unregister_application(app);
00206 }


Variable Documentation

const char app[] = "ChanIsAvail" [static]

Definition at line 48 of file app_chanisavail.c.


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