Tue Sep 30 01:19:39 2008

Asterisk developer's documentation


res_monitor.c

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00001 /*
00002  * Asterisk -- An open source telephony toolkit.
00003  *
00004  * Copyright (C) 1999 - 2005, Digium, Inc.
00005  *
00006  * Mark Spencer <markster@digium.com>
00007  *
00008  * See http://www.asterisk.org for more information about
00009  * the Asterisk project. Please do not directly contact
00010  * any of the maintainers of this project for assistance;
00011  * the project provides a web site, mailing lists and IRC
00012  * channels for your use.
00013  *
00014  * This program is free software, distributed under the terms of
00015  * the GNU General Public License Version 2. See the LICENSE file
00016  * at the top of the source tree.
00017  */
00018 
00019 /*! \file
00020  *
00021  * \brief PBX channel monitoring
00022  *
00023  * \author Mark Spencer <markster@digium.com>
00024  */
00025  
00026 #include "asterisk.h"
00027 
00028 ASTERISK_FILE_VERSION(__FILE__, "$Revision: 101531 $")
00029 
00030 #include <stdio.h>
00031 #include <stdlib.h>
00032 #include <errno.h>
00033 #include <string.h>
00034 #include <sys/types.h>
00035 #include <sys/stat.h>
00036 #include <libgen.h>
00037 
00038 #include "asterisk/lock.h"
00039 #include "asterisk/channel.h"
00040 #include "asterisk/logger.h"
00041 #include "asterisk/file.h"
00042 #include "asterisk/pbx.h"
00043 #include "asterisk/module.h"
00044 #include "asterisk/manager.h"
00045 #include "asterisk/cli.h"
00046 #include "asterisk/monitor.h"
00047 #include "asterisk/app.h"
00048 #include "asterisk/utils.h"
00049 #include "asterisk/config.h"
00050 #include "asterisk/options.h"
00051 
00052 AST_MUTEX_DEFINE_STATIC(monitorlock);
00053 
00054 #define LOCK_IF_NEEDED(lock, needed) do { \
00055    if (needed) \
00056       ast_channel_lock(lock); \
00057    } while(0)
00058 
00059 #define UNLOCK_IF_NEEDED(lock, needed) do { \
00060    if (needed) \
00061       ast_channel_unlock(lock); \
00062    } while (0)
00063 
00064 static unsigned long seq = 0;
00065 
00066 static char *monitor_synopsis = "Monitor a channel";
00067 
00068 static char *monitor_descrip = "Monitor([file_format[:urlbase]|[fname_base]|[options]]):\n"
00069 "Used to start monitoring a channel. The channel's input and output\n"
00070 "voice packets are logged to files until the channel hangs up or\n"
00071 "monitoring is stopped by the StopMonitor application.\n"
00072 "  file_format    optional, if not set, defaults to \"wav\"\n"
00073 "  fname_base     if set, changes the filename used to the one specified.\n"
00074 "  options:\n"
00075 "    m   - when the recording ends mix the two leg files into one and\n"
00076 "          delete the two leg files.  If the variable MONITOR_EXEC is set, the\n"
00077 "          application referenced in it will be executed instead of\n"
00078 #ifdef HAVE_SOXMIX
00079 "          soxmix and the raw leg files will NOT be deleted automatically.\n"
00080 "          soxmix or MONITOR_EXEC is handed 3 arguments, the two leg files\n"
00081 #else
00082 "          sox and the raw leg files will NOT be deleted automatically.\n"
00083 "          sox or MONITOR_EXEC is handed 3 arguments, the two leg files\n"
00084 #endif
00085 "          and a target mixed file name which is the same as the leg file names\n"
00086 "          only without the in/out designator.\n"
00087 "          If MONITOR_EXEC_ARGS is set, the contents will be passed on as\n"
00088 "          additional arguements to MONITOR_EXEC\n"
00089 "          Both MONITOR_EXEC and the Mix flag can be set from the\n"
00090 "          administrator interface\n"
00091 "\n"
00092 "    b   - Don't begin recording unless a call is bridged to another channel\n"
00093 "\nReturns -1 if monitor files can't be opened or if the channel is already\n"
00094 "monitored, otherwise 0.\n"
00095 ;
00096 
00097 static char *stopmonitor_synopsis = "Stop monitoring a channel";
00098 
00099 static char *stopmonitor_descrip = "StopMonitor\n"
00100    "Stops monitoring a channel. Has no effect if the channel is not monitored\n";
00101 
00102 static char *changemonitor_synopsis = "Change monitoring filename of a channel";
00103 
00104 static char *changemonitor_descrip = "ChangeMonitor(filename_base)\n"
00105    "Changes monitoring filename of a channel. Has no effect if the channel is not monitored\n"
00106    "The argument is the new filename base to use for monitoring this channel.\n";
00107 
00108 static char *pausemonitor_synopsis = "Pause monitoring of a channel";
00109 
00110 static char *pausemonitor_descrip = "PauseMonitor\n"
00111    "Pauses monitoring of a channel until it is re-enabled by a call to UnpauseMonitor.\n";
00112 
00113 static char *unpausemonitor_synopsis = "Unpause monitoring of a channel";
00114 
00115 static char *unpausemonitor_descrip = "UnpauseMonitor\n"
00116    "Unpauses monitoring of a channel on which monitoring had\n"
00117    "previously been paused with PauseMonitor.\n";
00118 
00119 static int ast_monitor_set_state(struct ast_channel *chan, int state)
00120 {
00121    LOCK_IF_NEEDED(chan, 1);
00122    if (!chan->monitor) {
00123       UNLOCK_IF_NEEDED(chan, 1);
00124       return -1;
00125    }
00126    chan->monitor->state = state;
00127    UNLOCK_IF_NEEDED(chan, 1);
00128    return 0;
00129 }
00130 
00131 /* Start monitoring a channel */
00132 int ast_monitor_start(  struct ast_channel *chan, const char *format_spec,
00133       const char *fname_base, const char *target_url, const char *target_script, int need_lock)
00134 {
00135    int res = 0;
00136    char tmp[256];
00137 
00138    LOCK_IF_NEEDED(chan, need_lock);
00139 
00140    if (!(chan->monitor)) {
00141       struct ast_channel_monitor *monitor;
00142       char *channel_name, *p;
00143 
00144       /* Create monitoring directory if needed */
00145       if (mkdir(ast_config_AST_MONITOR_DIR, 0770) < 0) {
00146          if (errno != EEXIST) {
00147             ast_log(LOG_WARNING, "Unable to create audio monitor directory: %s\n",
00148                strerror(errno));
00149          }
00150       }
00151 
00152       if (!(monitor = ast_calloc(1, sizeof(*monitor)))) {
00153          UNLOCK_IF_NEEDED(chan, need_lock);
00154          return -1;
00155       }
00156 
00157       if (target_url)
00158           ast_copy_string(monitor->target_url, target_url, sizeof(monitor->target_url));
00159       if (target_script)
00160           ast_copy_string(monitor->target_script, target_script, sizeof(monitor->target_script));
00161 
00162       /* Determine file names */
00163       if (!ast_strlen_zero(fname_base)) {
00164          int directory = strchr(fname_base, '/') ? 1 : 0;
00165          const char *absolute = *fname_base == '/' ? "" : "/";
00166          /* try creating the directory just in case it doesn't exist */
00167          if (directory) {
00168             char *name = strdup(fname_base);
00169             snprintf(tmp, sizeof(tmp), "mkdir -p \"%s\"",dirname(name));
00170             free(name);
00171             ast_safe_system(tmp);
00172          }
00173          snprintf(monitor->read_filename, FILENAME_MAX, "%s%s%s-in",
00174                   directory ? "" : ast_config_AST_MONITOR_DIR, absolute, fname_base);
00175          snprintf(monitor->write_filename, FILENAME_MAX, "%s%s%s-out",
00176                   directory ? "" : ast_config_AST_MONITOR_DIR, absolute, fname_base);
00177          ast_copy_string(monitor->filename_base, fname_base, sizeof(monitor->filename_base));
00178       } else {
00179          ast_mutex_lock(&monitorlock);
00180          snprintf(monitor->read_filename, FILENAME_MAX, "%s/audio-in-%ld",
00181                   ast_config_AST_MONITOR_DIR, seq);
00182          snprintf(monitor->write_filename, FILENAME_MAX, "%s/audio-out-%ld",
00183                   ast_config_AST_MONITOR_DIR, seq);
00184          seq++;
00185          ast_mutex_unlock(&monitorlock);
00186 
00187          channel_name = ast_strdupa(chan->name);
00188          while ((p = strchr(channel_name, '/'))) {
00189             *p = '-';
00190          }
00191          snprintf(monitor->filename_base, FILENAME_MAX, "%s/%d-%s",
00192                 ast_config_AST_MONITOR_DIR, (int)time(NULL), channel_name);
00193          monitor->filename_changed = 1;
00194       }
00195 
00196       monitor->stop = ast_monitor_stop;
00197 
00198       /* Determine file format */
00199       if (!ast_strlen_zero(format_spec)) {
00200          monitor->format = strdup(format_spec);
00201       } else {
00202          monitor->format = strdup("wav");
00203       }
00204       
00205       /* open files */
00206       if (ast_fileexists(monitor->read_filename, NULL, NULL) > 0) {
00207          ast_filedelete(monitor->read_filename, NULL);
00208       }
00209       if (!(monitor->read_stream = ast_writefile(monitor->read_filename,
00210                   monitor->format, NULL,
00211                   O_CREAT|O_TRUNC|O_WRONLY, 0, 0644))) {
00212          ast_log(LOG_WARNING, "Could not create file %s\n",
00213                   monitor->read_filename);
00214          free(monitor);
00215          UNLOCK_IF_NEEDED(chan, need_lock);
00216          return -1;
00217       }
00218       if (ast_fileexists(monitor->write_filename, NULL, NULL) > 0) {
00219          ast_filedelete(monitor->write_filename, NULL);
00220       }
00221       if (!(monitor->write_stream = ast_writefile(monitor->write_filename,
00222                   monitor->format, NULL,
00223                   O_CREAT|O_TRUNC|O_WRONLY, 0, 0644))) {
00224          ast_log(LOG_WARNING, "Could not create file %s\n",
00225                   monitor->write_filename);
00226          ast_closestream(monitor->read_stream);
00227          free(monitor);
00228          UNLOCK_IF_NEEDED(chan, need_lock);
00229          return -1;
00230       }
00231       chan->monitor = monitor;
00232       ast_monitor_set_state(chan, AST_MONITOR_RUNNING);
00233       /* so we know this call has been monitored in case we need to bill for it or something */
00234       pbx_builtin_setvar_helper(chan, "__MONITORED","true");
00235    } else {
00236       ast_log(LOG_DEBUG,"Cannot start monitoring %s, already monitored\n",
00237                chan->name);
00238       res = -1;
00239    }
00240 
00241    UNLOCK_IF_NEEDED(chan, need_lock);
00242 
00243    return res;
00244 }
00245 
00246 /*
00247  * The file format extensions that Asterisk uses are not all the same as that
00248  * which soxmix expects.  This function ensures that the format used as the
00249  * extension on the filename is something soxmix will understand.
00250  */
00251 static const char *get_soxmix_format(const char *format)
00252 {
00253    const char *res = format;
00254 
00255    if (!strcasecmp(format,"ulaw"))
00256       res = "ul";
00257    if (!strcasecmp(format,"alaw"))
00258       res = "al";
00259    
00260    return res;
00261 }
00262 
00263 /* Stop monitoring a channel */
00264 int ast_monitor_stop(struct ast_channel *chan, int need_lock)
00265 {
00266    int delfiles = 0;
00267 
00268    LOCK_IF_NEEDED(chan, need_lock);
00269 
00270    if (chan->monitor) {
00271       char filename[ FILENAME_MAX ];
00272 
00273       if (chan->monitor->read_stream) {
00274          ast_closestream(chan->monitor->read_stream);
00275       }
00276       if (chan->monitor->write_stream) {
00277          ast_closestream(chan->monitor->write_stream);
00278       }
00279 
00280       if (chan->monitor->filename_changed && !ast_strlen_zero(chan->monitor->filename_base)) {
00281          if (ast_fileexists(chan->monitor->read_filename,NULL,NULL) > 0) {
00282             snprintf(filename, FILENAME_MAX, "%s-in", chan->monitor->filename_base);
00283             if (ast_fileexists(filename, NULL, NULL) > 0) {
00284                ast_filedelete(filename, NULL);
00285             }
00286             ast_filerename(chan->monitor->read_filename, filename, chan->monitor->format);
00287          } else {
00288             ast_log(LOG_WARNING, "File %s not found\n", chan->monitor->read_filename);
00289          }
00290 
00291          if (ast_fileexists(chan->monitor->write_filename,NULL,NULL) > 0) {
00292             snprintf(filename, FILENAME_MAX, "%s-out", chan->monitor->filename_base);
00293             if (ast_fileexists(filename, NULL, NULL) > 0) {
00294                ast_filedelete(filename, NULL);
00295             }
00296             ast_filerename(chan->monitor->write_filename, filename, chan->monitor->format);
00297          } else {
00298             ast_log(LOG_WARNING, "File %s not found\n", chan->monitor->write_filename);
00299          }
00300       }
00301 
00302       if (chan->monitor->joinfiles && !ast_strlen_zero(chan->monitor->filename_base)) {
00303          char tmp[1024];
00304          char tmp2[1024];
00305          char tmp3[1024];
00306          int result;
00307          const char *format = !strcasecmp(chan->monitor->format,"wav49") ? "WAV" : chan->monitor->format;
00308          char *name = chan->monitor->filename_base;
00309          int directory = strchr(name, '/') ? 1 : 0;
00310          char *dir = directory ? "" : ast_config_AST_MONITOR_DIR;
00311          const char *execute, *execute_args;
00312          const char *absolute = *name == '/' ? "" : "/";
00313 
00314          /* Set the execute application */
00315          execute = pbx_builtin_getvar_helper(chan, "MONITOR_EXEC");
00316          if (ast_strlen_zero(execute)) {
00317 #ifdef HAVE_SOXMIX
00318             execute = "nice -n 19 soxmix";
00319 #else
00320             execute = "nice -n 19 sox -m";
00321 #endif
00322             format = get_soxmix_format(format);
00323             delfiles = 1;
00324          } 
00325          execute_args = pbx_builtin_getvar_helper(chan, "MONITOR_EXEC_ARGS");
00326          if (ast_strlen_zero(execute_args)) {
00327             execute_args = "";
00328          }
00329          
00330          snprintf(tmp, sizeof(tmp), "%s \"%s%s%s-in.%s\" \"%s%s%s-out.%s\" \"%s%s%s.%s\" %s &", execute, dir, absolute, name, format, dir, absolute, name, format, dir, absolute, name, format,execute_args);
00331          if (delfiles) {
00332             snprintf(tmp2,sizeof(tmp2), "( %s& rm -f \"%s%s%s-\"* ) &",tmp, dir, absolute, name); /* remove legs when done mixing */
00333             ast_copy_string(tmp, tmp2, sizeof(tmp));
00334          }
00335          if (!ast_strlen_zero(chan->monitor->target_script) && !ast_strlen_zero(chan->monitor->target_url)) {
00336             snprintf(tmp3,sizeof(tmp3), "( %s& nice -19 %s \"%s/%s.%s\" \"%s\" ) &",tmp, chan->monitor->target_script , dir, name, format, chan->monitor->target_url); 
00337             ast_copy_string(tmp, tmp3, sizeof(tmp));
00338          }
00339          ast_log(LOG_NOTICE,"monitor executing %s\n",tmp);
00340          result = ast_safe_system(tmp);
00341          if (result == -1)
00342             ast_log(LOG_WARNING, "Execute of %s failed.\n",tmp);
00343          manager_event(EVENT_FLAG_CALL, "MonitorStopped",
00344                                "Channel: %s\r\n"
00345                                "Uniqueid: %s\r\n"
00346                    "Result: %d\r\n"
00347                            ,chan->name, chan->uniqueid, result);
00348       }
00349       
00350       free(chan->monitor->format);
00351       free(chan->monitor);
00352       chan->monitor = NULL;
00353    }
00354 
00355    UNLOCK_IF_NEEDED(chan, need_lock);
00356 
00357    return 0;
00358 }
00359 
00360 
00361 /* Pause monitoring of a channel */
00362 int ast_monitor_pause(struct ast_channel *chan)
00363 {
00364    return ast_monitor_set_state(chan, AST_MONITOR_PAUSED);
00365 }
00366 
00367 /* Unpause monitoring of a channel */
00368 int ast_monitor_unpause(struct ast_channel *chan)
00369 {
00370    return ast_monitor_set_state(chan, AST_MONITOR_RUNNING);
00371 }
00372 
00373 static int pause_monitor_exec(struct ast_channel *chan, void *data)
00374 {
00375    return ast_monitor_pause(chan);
00376 }
00377 
00378 static int unpause_monitor_exec(struct ast_channel *chan, void *data)
00379 {
00380    return ast_monitor_unpause(chan);
00381 }
00382 
00383 /* Change monitoring filename of a channel */
00384 int ast_monitor_change_fname(struct ast_channel *chan, const char *fname_base, int need_lock)
00385 {
00386    char tmp[256];
00387    if (ast_strlen_zero(fname_base)) {
00388       ast_log(LOG_WARNING, "Cannot change monitor filename of channel %s to null\n", chan->name);
00389       return -1;
00390    }
00391 
00392    LOCK_IF_NEEDED(chan, need_lock);
00393 
00394    if (chan->monitor) {
00395       int directory = strchr(fname_base, '/') ? 1 : 0;
00396       const char *absolute = *fname_base == '/' ? "" : "/";
00397       char tmpstring[sizeof(chan->monitor->filename_base)] = "";
00398 
00399       /* before continuing, see if we're trying to rename the file to itself... */
00400       snprintf(tmpstring, sizeof(tmpstring), "%s%s%s", directory ? "" : ast_config_AST_MONITOR_DIR, absolute, fname_base);
00401       if (!strcmp(tmpstring, chan->monitor->filename_base)) {
00402          if (option_debug > 2)
00403             ast_log(LOG_DEBUG, "No need to rename monitor filename to itself\n");
00404          UNLOCK_IF_NEEDED(chan, need_lock);
00405          return 0;
00406       }
00407 
00408       /* try creating the directory just in case it doesn't exist */
00409       if (directory) {
00410          char *name = strdup(fname_base);
00411          snprintf(tmp, sizeof(tmp), "mkdir -p %s",dirname(name));
00412          free(name);
00413          ast_safe_system(tmp);
00414       }
00415 
00416       ast_copy_string(chan->monitor->filename_base, tmpstring, sizeof(chan->monitor->filename_base));
00417       chan->monitor->filename_changed = 1;
00418    } else {
00419       ast_log(LOG_WARNING, "Cannot change monitor filename of channel %s to %s, monitoring not started\n", chan->name, fname_base);
00420    }
00421 
00422    UNLOCK_IF_NEEDED(chan, need_lock);
00423 
00424    return 0;
00425 }
00426 
00427 static int start_monitor_exec(struct ast_channel *chan, void *data)
00428 {
00429    char *arg = NULL;
00430    char *format = NULL;
00431    char *fname_base = NULL;
00432    char *options = NULL;
00433    char *delay = NULL;
00434    char *urlprefix = NULL;
00435    char tmp[256];
00436    int joinfiles = 0;
00437    int waitforbridge = 0;
00438    int res = 0;
00439    
00440    /* Parse arguments. */
00441    if (!ast_strlen_zero((char*)data)) {
00442       arg = ast_strdupa((char*)data);
00443       format = arg;
00444       fname_base = strchr(arg, '|');
00445       if (fname_base) {
00446          *fname_base = 0;
00447          fname_base++;
00448          if ((options = strchr(fname_base, '|'))) {
00449             *options = 0;
00450             options++;
00451             if (strchr(options, 'm'))
00452                joinfiles = 1;
00453             if (strchr(options, 'b'))
00454                waitforbridge = 1;
00455          }
00456       }
00457       arg = strchr(format,':');
00458       if (arg) {
00459          *arg++ = 0;
00460          urlprefix = arg;
00461       }
00462    }
00463    if (urlprefix) {
00464       snprintf(tmp,sizeof(tmp) - 1,"%s/%s.%s",urlprefix,fname_base,
00465          ((strcmp(format,"gsm")) ? "wav" : "gsm"));
00466       if (!chan->cdr && !(chan->cdr = ast_cdr_alloc()))
00467          return -1;
00468       ast_cdr_setuserfield(chan, tmp);
00469    }
00470    if (waitforbridge) {
00471       /* We must remove the "b" option if listed.  In principle none of
00472          the following could give NULL results, but we check just to
00473          be pedantic. Reconstructing with checks for 'm' option does not
00474          work if we end up adding more options than 'm' in the future. */
00475       delay = ast_strdupa(data);
00476       options = strrchr(delay, '|');
00477       if (options) {
00478          arg = strchr(options, 'b');
00479          if (arg) {
00480             *arg = 'X';
00481             pbx_builtin_setvar_helper(chan,"AUTO_MONITOR",delay);
00482          }
00483       }
00484       return 0;
00485    }
00486 
00487    res = ast_monitor_start(chan, format, fname_base, NULL, NULL, 1);
00488    if (res < 0)
00489       res = ast_monitor_change_fname(chan, fname_base, 1);
00490    ast_monitor_setjoinfiles(chan, joinfiles);
00491 
00492    return res;
00493 }
00494 
00495 static int stop_monitor_exec(struct ast_channel *chan, void *data)
00496 {
00497    return ast_monitor_stop(chan, 1);
00498 }
00499 
00500 static int change_monitor_exec(struct ast_channel *chan, void *data)
00501 {
00502    return ast_monitor_change_fname(chan, (const char*)data, 1);
00503 }
00504 
00505 static char start_monitor_action_help[] =
00506 "Description: The 'Monitor' action may be used to record the audio on a\n"
00507 "  specified channel.  The following parameters may be used to control\n"
00508 "  this:\n"
00509 "  Channel     - Required.  Used to specify the channel to record.\n"
00510 "  File        - Optional.  Is the name of the file created in the\n"
00511 "                monitor spool directory.  Defaults to the same name\n"
00512 "                as the channel (with slashes replaced with dashes).\n"
00513 "  Format      - Optional.  Is the audio recording format.  Defaults\n"
00514 "                to \"wav\".\n"
00515 "  Mix         - Optional.  Boolean parameter as to whether to mix\n"
00516 "                the input and output channels together after the\n"
00517 "                recording is finished.\n";
00518 
00519 static int start_monitor_action(struct mansession *s, const struct message *m)
00520 {
00521    struct ast_channel *c = NULL;
00522    const char *name = astman_get_header(m, "Channel");
00523    const char *fname = astman_get_header(m, "File");
00524    const char *format = astman_get_header(m, "Format");
00525    const char *mix = astman_get_header(m, "Mix");
00526    const char *uniqueid = astman_get_header(m, "Uniqueid");
00527    const char *target_url = astman_get_header(m, "TargetURL");
00528    const char *target_script = astman_get_header(m, "TargetScript");
00529    char *d;
00530    
00531    if (ast_strlen_zero(name) && ast_strlen_zero(uniqueid)) {
00532       astman_send_error(s, m, "No channel/uniqueid specified");
00533       return 0;
00534    }
00535 
00536    if (!ast_strlen_zero(uniqueid)) {
00537        c = ast_get_channel_by_uniqueid_locked(uniqueid);
00538        if (!c) {
00539       astman_send_error(s, m, "No such uniqueid");
00540       return 0;
00541        }
00542    } else {
00543        c = ast_get_channel_by_name_locked(name);
00544        if (!c) {
00545       astman_send_error(s, m, "No such channel");
00546       return 0;
00547        }
00548    }
00549 
00550    if (ast_strlen_zero(fname)) {
00551       /* No filename base specified, default to channel name as per CLI */    
00552       if (!(fname = ast_strdup(c->name))) {
00553          astman_send_error(s, m, "Could not start monitoring channel");
00554          ast_channel_unlock(c);
00555          return 0;
00556       }
00557       /* Channels have the format technology/channel_name - have to replace that /  */
00558       if ((d = strchr(fname, '/'))) 
00559          *d = '-';
00560    }
00561    
00562    if (ast_monitor_start(c, format, fname, target_url, target_script, 1)) {
00563       if (ast_monitor_change_fname(c, fname, 1)) {
00564          astman_send_error(s, m, "Could not start monitoring channel");
00565          ast_channel_unlock(c);
00566          return 0;
00567       }
00568    }
00569 
00570    if (ast_true(mix)) {
00571       ast_monitor_setjoinfiles(c, 1);
00572    }
00573 
00574    ast_channel_unlock(c);
00575    astman_send_ack(s, m, "Started monitoring channel");
00576    return 0;
00577 }
00578 
00579 static char stop_monitor_action_help[] =
00580 "Description: The 'StopMonitor' action may be used to end a previously\n"
00581 "  started 'Monitor' action.  The only parameter is 'Channel', the name\n"
00582 "  of the channel monitored.\n";
00583 
00584 static int stop_monitor_action(struct mansession *s, const struct message *m)
00585 {
00586    struct ast_channel *c = NULL;
00587    const char *name = astman_get_header(m, "Channel");
00588    const char *uniqueid = astman_get_header(m, "Uniqueid");
00589    int res;
00590    if (ast_strlen_zero(name)) {
00591       astman_send_error(s, m, "No channel specified");
00592       return 0;
00593    }
00594    if (ast_strlen_zero(name) && ast_strlen_zero(uniqueid)) {
00595       astman_send_error(s, m, "No channel/uniqueid specified");
00596       return 0;
00597    }
00598    if (!ast_strlen_zero(uniqueid)) {
00599        c = ast_get_channel_by_uniqueid_locked(uniqueid);
00600        if (!c) {
00601       astman_send_error(s, m, "No such uniqueid");
00602       return 0;
00603        }
00604    } else {
00605        c = ast_get_channel_by_name_locked(name);
00606        if (!c) {
00607       astman_send_error(s, m, "No such channel");
00608       return 0;
00609        }
00610    }
00611 
00612    res = ast_monitor_stop(c, 1);
00613    ast_channel_unlock(c);
00614    if (res) {
00615       astman_send_error(s, m, "Could not stop monitoring channel");
00616       return 0;
00617    }
00618    astman_send_ack(s, m, "Stopped monitoring channel");
00619    return 0;
00620 }
00621 
00622 static char change_monitor_action_help[] =
00623 "Description: The 'ChangeMonitor' action may be used to change the file\n"
00624 "  started by a previous 'Monitor' action.  The following parameters may\n"
00625 "  be used to control this:\n"
00626 "  Channel     - Required.  Used to specify the channel to record.\n"
00627 "  File        - Required.  Is the new name of the file created in the\n"
00628 "                monitor spool directory.\n";
00629 
00630 static int change_monitor_action(struct mansession *s, const struct message *m)
00631 {
00632    struct ast_channel *c = NULL;
00633    const char *name = astman_get_header(m, "Channel");
00634    const char *fname = astman_get_header(m, "File");
00635    if (ast_strlen_zero(name)) {
00636       astman_send_error(s, m, "No channel specified");
00637       return 0;
00638    }
00639    if (ast_strlen_zero(fname)) {
00640       astman_send_error(s, m, "No filename specified");
00641       return 0;
00642    }
00643    c = ast_get_channel_by_name_locked(name);
00644    if (!c) {
00645       astman_send_error(s, m, "No such channel");
00646       return 0;
00647    }
00648    if (ast_monitor_change_fname(c, fname, 1)) {
00649       astman_send_error(s, m, "Could not change monitored filename of channel");
00650       ast_channel_unlock(c);
00651       return 0;
00652    }
00653    ast_channel_unlock(c);
00654    astman_send_ack(s, m, "Changed monitor filename");
00655    return 0;
00656 }
00657 
00658 void ast_monitor_setjoinfiles(struct ast_channel *chan, int turnon)
00659 {
00660    if (chan->monitor)
00661       chan->monitor->joinfiles = turnon;
00662 }
00663 
00664 #define IS_NULL_STRING(string) ((!(string)) || (ast_strlen_zero((string))))
00665 
00666 enum MONITOR_PAUSING_ACTION
00667 {
00668    MONITOR_ACTION_PAUSE,
00669    MONITOR_ACTION_UNPAUSE
00670 };
00671      
00672 static int do_pause_or_unpause(struct mansession *s, const struct message *m, int action)
00673 {
00674    struct ast_channel *c = NULL;
00675    const char *name = astman_get_header(m, "Channel");
00676    
00677    if (IS_NULL_STRING(name)) {
00678       astman_send_error(s, m, "No channel specified");
00679       return -1;
00680    }
00681    
00682    c = ast_get_channel_by_name_locked(name);
00683    if (!c) {
00684       astman_send_error(s, m, "No such channel");
00685       return -1;
00686    }
00687 
00688    if (action == MONITOR_ACTION_PAUSE)
00689       ast_monitor_pause(c);
00690    else
00691       ast_monitor_unpause(c);
00692    
00693    ast_channel_unlock(c);
00694    astman_send_ack(s, m, (action == MONITOR_ACTION_PAUSE ? "Paused monitoring of the channel" : "Unpaused monitoring of the channel"));
00695    return 0;   
00696 }
00697 
00698 static char pause_monitor_action_help[] =
00699    "Description: The 'PauseMonitor' action may be used to temporarily stop the\n"
00700    " recording of a channel.  The following parameters may\n"
00701    " be used to control this:\n"
00702    "  Channel     - Required.  Used to specify the channel to record.\n";
00703 
00704 static int pause_monitor_action(struct mansession *s, const struct message *m)
00705 {
00706    return do_pause_or_unpause(s, m, MONITOR_ACTION_PAUSE);
00707 }
00708 
00709 static char unpause_monitor_action_help[] =
00710    "Description: The 'UnpauseMonitor' action may be used to re-enable recording\n"
00711    "  of a channel after calling PauseMonitor.  The following parameters may\n"
00712    "  be used to control this:\n"
00713    "  Channel     - Required.  Used to specify the channel to record.\n";
00714 
00715 static int unpause_monitor_action(struct mansession *s, const struct message *m)
00716 {
00717    return do_pause_or_unpause(s, m, MONITOR_ACTION_UNPAUSE);
00718 }
00719    
00720 
00721 static int load_module(void)
00722 {
00723    ast_register_application("Monitor", start_monitor_exec, monitor_synopsis, monitor_descrip);
00724    ast_register_application("StopMonitor", stop_monitor_exec, stopmonitor_synopsis, stopmonitor_descrip);
00725    ast_register_application("ChangeMonitor", change_monitor_exec, changemonitor_synopsis, changemonitor_descrip);
00726    ast_register_application("PauseMonitor", pause_monitor_exec, pausemonitor_synopsis, pausemonitor_descrip);
00727    ast_register_application("UnpauseMonitor", unpause_monitor_exec, unpausemonitor_synopsis, unpausemonitor_descrip);
00728    ast_manager_register2("Monitor", EVENT_FLAG_CALL, start_monitor_action, monitor_synopsis, start_monitor_action_help);
00729    ast_manager_register2("StopMonitor", EVENT_FLAG_CALL, stop_monitor_action, stopmonitor_synopsis, stop_monitor_action_help);
00730    ast_manager_register2("ChangeMonitor", EVENT_FLAG_CALL, change_monitor_action, changemonitor_synopsis, change_monitor_action_help);
00731    ast_manager_register2("PauseMonitor", EVENT_FLAG_CALL, pause_monitor_action, pausemonitor_synopsis, pause_monitor_action_help);
00732    ast_manager_register2("UnpauseMonitor", EVENT_FLAG_CALL, unpause_monitor_action, unpausemonitor_synopsis, unpause_monitor_action_help);
00733 
00734    return 0;
00735 }
00736 
00737 static int unload_module(void)
00738 {
00739    ast_unregister_application("Monitor");
00740    ast_unregister_application("StopMonitor");
00741    ast_unregister_application("ChangeMonitor");
00742    ast_unregister_application("PauseMonitor");
00743    ast_unregister_application("UnpauseMonitor");
00744    ast_manager_unregister("Monitor");
00745    ast_manager_unregister("StopMonitor");
00746    ast_manager_unregister("ChangeMonitor");
00747    ast_manager_unregister("PauseMonitor");
00748    ast_manager_unregister("UnpauseMonitor");
00749 
00750    return 0;
00751 }
00752 
00753 /* usecount semantics need to be defined */
00754 AST_MODULE_INFO(ASTERISK_GPL_KEY, AST_MODFLAG_GLOBAL_SYMBOLS, "Call Monitoring Resource",
00755       .load = load_module,
00756       .unload = unload_module,
00757       );

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