Wed Oct 28 11:51:07 2009

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: 183768 $")
00029 
00030 #include <sys/stat.h>
00031 #include <libgen.h>
00032 
00033 #include "asterisk/paths.h"   /* use ast_config_AST_MONITOR_DIR */
00034 #include "asterisk/lock.h"
00035 #include "asterisk/channel.h"
00036 #include "asterisk/file.h"
00037 #include "asterisk/pbx.h"
00038 #include "asterisk/module.h"
00039 #include "asterisk/manager.h"
00040 #include "asterisk/cli.h"
00041 #include "asterisk/monitor.h"
00042 #include "asterisk/app.h"
00043 #include "asterisk/utils.h"
00044 #include "asterisk/config.h"
00045 #include "asterisk/options.h"
00046 
00047 AST_MUTEX_DEFINE_STATIC(monitorlock);
00048 
00049 #define LOCK_IF_NEEDED(lock, needed) do { \
00050    if (needed) \
00051       ast_channel_lock(lock); \
00052    } while(0)
00053 
00054 #define UNLOCK_IF_NEEDED(lock, needed) do { \
00055    if (needed) \
00056       ast_channel_unlock(lock); \
00057    } while (0)
00058 
00059 static unsigned long seq = 0;
00060 
00061 static char *monitor_synopsis = "Monitor a channel";
00062 
00063 static char *monitor_descrip = "  Monitor([file_format[:urlbase],[fname_base],[options]]):\n"
00064 "Used to start monitoring a channel. The channel's input and output\n"
00065 "voice packets are logged to files until the channel hangs up or\n"
00066 "monitoring is stopped by the StopMonitor application.\n"
00067 "  file_format    optional, if not set, defaults to \"wav\"\n"
00068 "  fname_base     if set, changes the filename used to the one specified.\n"
00069 "  options:\n"
00070 "    m   - when the recording ends mix the two leg files into one and\n"
00071 "          delete the two leg files.  If the variable MONITOR_EXEC is set, the\n"
00072 "          application referenced in it will be executed instead of\n"
00073 #ifdef HAVE_SOXMIX
00074 "          soxmix and the raw leg files will NOT be deleted automatically.\n"
00075 "          soxmix or MONITOR_EXEC is handed 3 arguments, the two leg files\n"
00076 #else
00077 "          sox and the raw leg files will NOT be deleted automatically.\n"
00078 "          sox or MONITOR_EXEC is handed 3 arguments, the two leg files\n"
00079 #endif
00080 "          and a target mixed file name which is the same as the leg file names\n"
00081 "          only without the in/out designator.\n"
00082 "          If MONITOR_EXEC_ARGS is set, the contents will be passed on as\n"
00083 "          additional arguments to MONITOR_EXEC\n"
00084 "          Both MONITOR_EXEC and the Mix flag can be set from the\n"
00085 "          administrator interface\n"
00086 "\n"
00087 "    b   - Don't begin recording unless a call is bridged to another channel\n"
00088 "    i   - Skip recording of input stream (disables m option)\n"
00089 "    o   - Skip recording of output stream (disables m option)\n"
00090 "\nBy default, files are stored to /var/spool/asterisk/monitor/.\n"
00091 "\nReturns -1 if monitor files can't be opened or if the channel is already\n"
00092 "monitored, otherwise 0.\n"
00093 ;
00094 
00095 static char *stopmonitor_synopsis = "Stop monitoring a channel";
00096 
00097 static char *stopmonitor_descrip = "  StopMonitor():\n"
00098    "Stops monitoring a channel. Has no effect if the channel is not monitored\n";
00099 
00100 static char *changemonitor_synopsis = "Change monitoring filename of a channel";
00101 
00102 static char *changemonitor_descrip = "  ChangeMonitor(filename_base):\n"
00103    "Changes monitoring filename of a channel. Has no effect if the channel is not monitored.\n"
00104    "The argument is the new filename base to use for monitoring this channel.\n";
00105 
00106 static char *pausemonitor_synopsis = "Pause monitoring of a channel";
00107 
00108 static char *pausemonitor_descrip = "  PauseMonitor():\n"
00109    "Pauses monitoring of a channel until it is re-enabled by a call to UnpauseMonitor.\n";
00110 
00111 static char *unpausemonitor_synopsis = "Unpause monitoring of a channel";
00112 
00113 static char *unpausemonitor_descrip = "  UnpauseMonitor():\n"
00114    "Unpauses monitoring of a channel on which monitoring had\n"
00115    "previously been paused with PauseMonitor.\n";
00116 
00117 /*! 
00118  * \brief Change state of monitored channel 
00119  * \param chan 
00120  * \param state monitor state
00121  * \retval 0 on success.
00122  * \retval -1 on failure.
00123 */
00124 static int ast_monitor_set_state(struct ast_channel *chan, int state)
00125 {
00126    LOCK_IF_NEEDED(chan, 1);
00127    if (!chan->monitor) {
00128       UNLOCK_IF_NEEDED(chan, 1);
00129       return -1;
00130    }
00131    chan->monitor->state = state;
00132    UNLOCK_IF_NEEDED(chan, 1);
00133    return 0;
00134 }
00135 
00136 /*! \brief Start monitoring a channel
00137  * \param chan ast_channel struct to record
00138  * \param format_spec file format to use for recording
00139  * \param fname_base filename base to record to
00140  * \param need_lock whether to lock the channel mutex
00141  * \param stream_action whether to record the input and/or output streams.  X_REC_IN | X_REC_OUT is most often used
00142  * Creates the file to record, if no format is specified it assumes WAV
00143  * It also sets channel variable __MONITORED=yes
00144  * \retval 0 on success
00145  * \retval -1 on failure
00146  */
00147 int ast_monitor_start(  struct ast_channel *chan, const char *format_spec,
00148       const char *fname_base, int need_lock, int stream_action)
00149 {
00150    int res = 0;
00151 
00152    LOCK_IF_NEEDED(chan, need_lock);
00153 
00154    if (!(chan->monitor)) {
00155       struct ast_channel_monitor *monitor;
00156       char *channel_name, *p;
00157 
00158       /* Create monitoring directory if needed */
00159       ast_mkdir(ast_config_AST_MONITOR_DIR, 0777);
00160 
00161       if (!(monitor = ast_calloc(1, sizeof(*monitor)))) {
00162          UNLOCK_IF_NEEDED(chan, need_lock);
00163          return -1;
00164       }
00165 
00166       /* Determine file names */
00167       if (!ast_strlen_zero(fname_base)) {
00168          int directory = strchr(fname_base, '/') ? 1 : 0;
00169          const char *absolute = *fname_base == '/' ? "" : "/";
00170          /* try creating the directory just in case it doesn't exist */
00171          if (directory) {
00172             char *name = ast_strdupa(fname_base);
00173             ast_mkdir(dirname(name), 0777);
00174          }
00175          snprintf(monitor->read_filename, FILENAME_MAX, "%s%s%s-in",
00176                   directory ? "" : ast_config_AST_MONITOR_DIR, absolute, fname_base);
00177          snprintf(monitor->write_filename, FILENAME_MAX, "%s%s%s-out",
00178                   directory ? "" : ast_config_AST_MONITOR_DIR, absolute, fname_base);
00179          ast_copy_string(monitor->filename_base, fname_base, sizeof(monitor->filename_base));
00180       } else {
00181          ast_mutex_lock(&monitorlock);
00182          snprintf(monitor->read_filename, FILENAME_MAX, "%s/audio-in-%ld",
00183                   ast_config_AST_MONITOR_DIR, seq);
00184          snprintf(monitor->write_filename, FILENAME_MAX, "%s/audio-out-%ld",
00185                   ast_config_AST_MONITOR_DIR, seq);
00186          seq++;
00187          ast_mutex_unlock(&monitorlock);
00188 
00189          channel_name = ast_strdupa(chan->name);
00190          while ((p = strchr(channel_name, '/'))) {
00191             *p = '-';
00192          }
00193          snprintf(monitor->filename_base, FILENAME_MAX, "%s/%d-%s",
00194                 ast_config_AST_MONITOR_DIR, (int)time(NULL), channel_name);
00195          monitor->filename_changed = 1;
00196       }
00197 
00198       monitor->stop = ast_monitor_stop;
00199 
00200       /* Determine file format */
00201       if (!ast_strlen_zero(format_spec)) {
00202          monitor->format = ast_strdup(format_spec);
00203       } else {
00204          monitor->format = ast_strdup("wav");
00205       }
00206       
00207       /* open files */
00208       if (stream_action & X_REC_IN) {
00209          if (ast_fileexists(monitor->read_filename, NULL, NULL) > 0)
00210             ast_filedelete(monitor->read_filename, NULL);
00211          if (!(monitor->read_stream = ast_writefile(monitor->read_filename,
00212                      monitor->format, NULL,
00213                      O_CREAT|O_TRUNC|O_WRONLY, 0, AST_FILE_MODE))) {
00214             ast_log(LOG_WARNING, "Could not create file %s\n",
00215                      monitor->read_filename);
00216             ast_free(monitor);
00217             UNLOCK_IF_NEEDED(chan, need_lock);
00218             return -1;
00219          }
00220       } else
00221          monitor->read_stream = NULL;
00222 
00223       if (stream_action & X_REC_OUT) {
00224          if (ast_fileexists(monitor->write_filename, NULL, NULL) > 0) {
00225             ast_filedelete(monitor->write_filename, NULL);
00226          }
00227          if (!(monitor->write_stream = ast_writefile(monitor->write_filename,
00228                      monitor->format, NULL,
00229                      O_CREAT|O_TRUNC|O_WRONLY, 0, AST_FILE_MODE))) {
00230             ast_log(LOG_WARNING, "Could not create file %s\n",
00231                      monitor->write_filename);
00232             ast_closestream(monitor->read_stream);
00233             ast_free(monitor);
00234             UNLOCK_IF_NEEDED(chan, need_lock);
00235             return -1;
00236          }
00237       } else
00238          monitor->write_stream = NULL;
00239 
00240       chan->monitor = monitor;
00241       ast_monitor_set_state(chan, AST_MONITOR_RUNNING);
00242       /* so we know this call has been monitored in case we need to bill for it or something */
00243       pbx_builtin_setvar_helper(chan, "__MONITORED","true");
00244 
00245       manager_event(EVENT_FLAG_CALL, "MonitorStart",
00246                          "Channel: %s\r\n"
00247                           "Uniqueid: %s\r\n",                        
00248                            chan->name,
00249                          chan->uniqueid                        
00250                           );
00251    } else {
00252       ast_debug(1,"Cannot start monitoring %s, already monitored\n", chan->name);
00253       res = -1;
00254    }
00255 
00256    UNLOCK_IF_NEEDED(chan, need_lock);
00257 
00258    return res;
00259 }
00260 
00261 /*!
00262  * \brief Get audio format.
00263  * \param format recording format.
00264  * The file format extensions that Asterisk uses are not all the same as that
00265  * which soxmix expects.  This function ensures that the format used as the
00266  * extension on the filename is something soxmix will understand.
00267  */
00268 static const char *get_soxmix_format(const char *format)
00269 {
00270    const char *res = format;
00271 
00272    if (!strcasecmp(format,"ulaw"))
00273       res = "ul";
00274    if (!strcasecmp(format,"alaw"))
00275       res = "al";
00276    
00277    return res;
00278 }
00279 
00280 /*! 
00281  * \brief Stop monitoring channel 
00282  * \param chan 
00283  * \param need_lock
00284  * Stop the recording, close any open streams, mix in/out channels if required
00285  * \return Always 0
00286 */
00287 int ast_monitor_stop(struct ast_channel *chan, int need_lock)
00288 {
00289    int delfiles = 0;
00290 
00291    LOCK_IF_NEEDED(chan, need_lock);
00292 
00293    if (chan->monitor) {
00294       char filename[ FILENAME_MAX ];
00295 
00296       if (chan->monitor->read_stream) {
00297          ast_closestream(chan->monitor->read_stream);
00298       }
00299       if (chan->monitor->write_stream) {
00300          ast_closestream(chan->monitor->write_stream);
00301       }
00302 
00303       if (chan->monitor->filename_changed && !ast_strlen_zero(chan->monitor->filename_base)) {
00304          if (ast_fileexists(chan->monitor->read_filename,NULL,NULL) > 0) {
00305             snprintf(filename, FILENAME_MAX, "%s-in", chan->monitor->filename_base);
00306             if (ast_fileexists(filename, NULL, NULL) > 0) {
00307                ast_filedelete(filename, NULL);
00308             }
00309             ast_filerename(chan->monitor->read_filename, filename, chan->monitor->format);
00310          } else {
00311             ast_log(LOG_WARNING, "File %s not found\n", chan->monitor->read_filename);
00312          }
00313 
00314          if (ast_fileexists(chan->monitor->write_filename,NULL,NULL) > 0) {
00315             snprintf(filename, FILENAME_MAX, "%s-out", chan->monitor->filename_base);
00316             if (ast_fileexists(filename, NULL, NULL) > 0) {
00317                ast_filedelete(filename, NULL);
00318             }
00319             ast_filerename(chan->monitor->write_filename, filename, chan->monitor->format);
00320          } else {
00321             ast_log(LOG_WARNING, "File %s not found\n", chan->monitor->write_filename);
00322          }
00323       }
00324 
00325       if (chan->monitor->joinfiles && !ast_strlen_zero(chan->monitor->filename_base)) {
00326          char tmp[1024];
00327          char tmp2[1024];
00328          const char *format = !strcasecmp(chan->monitor->format,"wav49") ? "WAV" : chan->monitor->format;
00329          char *name = chan->monitor->filename_base;
00330          int directory = strchr(name, '/') ? 1 : 0;
00331          const char *dir = directory ? "" : ast_config_AST_MONITOR_DIR;
00332          const char *execute, *execute_args;
00333          const char *absolute = *name == '/' ? "" : "/";
00334 
00335          /* Set the execute application */
00336          execute = pbx_builtin_getvar_helper(chan, "MONITOR_EXEC");
00337          if (ast_strlen_zero(execute)) {
00338 #ifdef HAVE_SOXMIX
00339             execute = "nice -n 19 soxmix";
00340 #else
00341             execute = "nice -n 19 sox -m";
00342 #endif
00343             format = get_soxmix_format(format);
00344             delfiles = 1;
00345          } 
00346          execute_args = pbx_builtin_getvar_helper(chan, "MONITOR_EXEC_ARGS");
00347          if (ast_strlen_zero(execute_args)) {
00348             execute_args = "";
00349          }
00350          
00351          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);
00352          if (delfiles) {
00353             snprintf(tmp2,sizeof(tmp2), "( %s& rm -f \"%s%s%s-\"* ) &",tmp, dir, absolute, name); /* remove legs when done mixing */
00354             ast_copy_string(tmp, tmp2, sizeof(tmp));
00355          }
00356          ast_debug(1,"monitor executing %s\n",tmp);
00357          if (ast_safe_system(tmp) == -1)
00358             ast_log(LOG_WARNING, "Execute of %s failed.\n",tmp);
00359       }
00360       
00361       ast_free(chan->monitor->format);
00362       ast_free(chan->monitor);
00363       chan->monitor = NULL;
00364 
00365       manager_event(EVENT_FLAG_CALL, "MonitorStop",
00366                          "Channel: %s\r\n"
00367                            "Uniqueid: %s\r\n",
00368                            chan->name,
00369                            chan->uniqueid
00370                            );
00371    }
00372 
00373    UNLOCK_IF_NEEDED(chan, need_lock);
00374 
00375    return 0;
00376 }
00377 
00378 
00379 /*! \brief Pause monitoring of channel */
00380 int ast_monitor_pause(struct ast_channel *chan)
00381 {
00382    return ast_monitor_set_state(chan, AST_MONITOR_PAUSED);
00383 }
00384 
00385 /*! \brief Unpause monitoring of channel */
00386 int ast_monitor_unpause(struct ast_channel *chan)
00387 {
00388    return ast_monitor_set_state(chan, AST_MONITOR_RUNNING);
00389 }
00390 
00391 /*! \brief Wrapper for ast_monitor_pause */
00392 static int pause_monitor_exec(struct ast_channel *chan, void *data)
00393 {
00394    return ast_monitor_pause(chan);
00395 }
00396 
00397 /*! \brief Wrapper for ast_monitor_unpause */
00398 static int unpause_monitor_exec(struct ast_channel *chan, void *data)
00399 {
00400    return ast_monitor_unpause(chan);
00401 }
00402 
00403 /*! 
00404  * \brief Change monitored filename of channel 
00405  * \param chan
00406  * \param fname_base new filename
00407  * \param need_lock
00408  * \retval 0 on success.
00409  * \retval -1 on failure.
00410 */
00411 int ast_monitor_change_fname(struct ast_channel *chan, const char *fname_base, int need_lock)
00412 {
00413    if (ast_strlen_zero(fname_base)) {
00414       ast_log(LOG_WARNING, "Cannot change monitor filename of channel %s to null\n", chan->name);
00415       return -1;
00416    }
00417 
00418    LOCK_IF_NEEDED(chan, need_lock);
00419 
00420    if (chan->monitor) {
00421       int directory = strchr(fname_base, '/') ? 1 : 0;
00422       const char *absolute = *fname_base == '/' ? "" : "/";
00423       char tmpstring[sizeof(chan->monitor->filename_base)] = "";
00424 
00425       /* before continuing, see if we're trying to rename the file to itself... */
00426       snprintf(tmpstring, sizeof(tmpstring), "%s%s%s", directory ? "" : ast_config_AST_MONITOR_DIR, absolute, fname_base);
00427       if (!strcmp(tmpstring, chan->monitor->filename_base)) {
00428          if (option_debug > 2)
00429             ast_log(LOG_DEBUG, "No need to rename monitor filename to itself\n");
00430          UNLOCK_IF_NEEDED(chan, need_lock);
00431          return 0;
00432       }
00433 
00434       /* try creating the directory just in case it doesn't exist */
00435       if (directory) {
00436          char *name = ast_strdupa(fname_base);
00437          ast_mkdir(dirname(name), 0777);
00438       }
00439 
00440       ast_copy_string(chan->monitor->filename_base, tmpstring, sizeof(chan->monitor->filename_base));
00441       chan->monitor->filename_changed = 1;
00442    } else {
00443       ast_log(LOG_WARNING, "Cannot change monitor filename of channel %s to %s, monitoring not started\n", chan->name, fname_base);
00444    }
00445 
00446    UNLOCK_IF_NEEDED(chan, need_lock);
00447 
00448    return 0;
00449 }
00450 
00451  
00452 /*!
00453  * \brief Start monitor
00454  * \param chan
00455  * \param data arguments passed fname|options
00456  * \retval 0 on success.
00457  * \retval -1 on failure.
00458 */
00459 static int start_monitor_exec(struct ast_channel *chan, void *data)
00460 {
00461    char *arg = NULL;
00462    char *options = NULL;
00463    char *delay = NULL;
00464    char *urlprefix = NULL;
00465    char tmp[256];
00466    int stream_action = X_REC_IN | X_REC_OUT;
00467    int joinfiles = 0;
00468    int waitforbridge = 0;
00469    int res = 0;
00470    char *parse;
00471    AST_DECLARE_APP_ARGS(args,
00472       AST_APP_ARG(format);
00473       AST_APP_ARG(fname_base);
00474       AST_APP_ARG(options);
00475    );
00476    
00477    /* Parse arguments. */
00478    if (ast_strlen_zero((char*)data)) {
00479       ast_log(LOG_ERROR, "Monitor requires an argument\n");
00480       return 0;
00481    }
00482 
00483    parse = ast_strdupa((char*)data);
00484    AST_STANDARD_APP_ARGS(args, parse);
00485 
00486    if (!ast_strlen_zero(args.options)) {
00487       if (strchr(args.options, 'm'))
00488          stream_action |= X_JOIN;
00489       if (strchr(args.options, 'b'))
00490          waitforbridge = 1;
00491       if (strchr(args.options, 'i'))
00492          stream_action &= ~X_REC_IN;
00493       if (strchr(args.options, 'o'))
00494          stream_action &= ~X_REC_OUT;
00495    }
00496 
00497    arg = strchr(args.format, ':');
00498    if (arg) {
00499       *arg++ = 0;
00500       urlprefix = arg;
00501    }
00502 
00503    if (urlprefix) {
00504       snprintf(tmp, sizeof(tmp), "%s/%s.%s", urlprefix, args.fname_base,
00505          ((strcmp(args.format, "gsm")) ? "wav" : "gsm"));
00506       if (!chan->cdr && !(chan->cdr = ast_cdr_alloc()))
00507          return -1;
00508       ast_cdr_setuserfield(chan, tmp);
00509    }
00510    if (waitforbridge) {
00511       /* We must remove the "b" option if listed.  In principle none of
00512          the following could give NULL results, but we check just to
00513          be pedantic. Reconstructing with checks for 'm' option does not
00514          work if we end up adding more options than 'm' in the future. */
00515       delay = ast_strdupa(data);
00516       options = strrchr(delay, ',');
00517       if (options) {
00518          arg = strchr(options, 'b');
00519          if (arg) {
00520             *arg = 'X';
00521             pbx_builtin_setvar_helper(chan,"AUTO_MONITOR", delay);
00522          }
00523       }
00524       return 0;
00525    }
00526 
00527    res = ast_monitor_start(chan, args.format, args.fname_base, 1, stream_action);
00528    if (res < 0)
00529       res = ast_monitor_change_fname(chan, args.fname_base, 1);
00530 
00531    if (stream_action & X_JOIN) {
00532       if ((stream_action & X_REC_IN) && (stream_action & X_REC_OUT))
00533          joinfiles = 1;
00534       else
00535          ast_log(LOG_WARNING, "Won't mix streams unless both input and output streams are recorded\n");
00536    }
00537    ast_monitor_setjoinfiles(chan, joinfiles);
00538 
00539    return res;
00540 }
00541 
00542 /*! \brief Wrapper function \see ast_monitor_stop */
00543 static int stop_monitor_exec(struct ast_channel *chan, void *data)
00544 {
00545    return ast_monitor_stop(chan, 1);
00546 }
00547 
00548 /*! \brief Wrapper function \see ast_monitor_change_fname */
00549 static int change_monitor_exec(struct ast_channel *chan, void *data)
00550 {
00551    return ast_monitor_change_fname(chan, (const char*)data, 1);
00552 }
00553 
00554 static char start_monitor_action_help[] =
00555 "Description: The 'Monitor' action may be used to record the audio on a\n"
00556 "  specified channel.  The following parameters may be used to control\n"
00557 "  this:\n"
00558 "  Channel     - Required.  Used to specify the channel to record.\n"
00559 "  File        - Optional.  Is the name of the file created in the\n"
00560 "                monitor spool directory.  Defaults to the same name\n"
00561 "                as the channel (with slashes replaced with dashes).\n"
00562 "  Format      - Optional.  Is the audio recording format.  Defaults\n"
00563 "                to \"wav\".\n"
00564 "  Mix         - Optional.  Boolean parameter as to whether to mix\n"
00565 "                the input and output channels together after the\n"
00566 "                recording is finished.\n";
00567 
00568 /*! \brief Start monitoring a channel by manager connection */
00569 static int start_monitor_action(struct mansession *s, const struct message *m)
00570 {
00571    struct ast_channel *c = NULL;
00572    const char *name = astman_get_header(m, "Channel");
00573    const char *fname = astman_get_header(m, "File");
00574    const char *format = astman_get_header(m, "Format");
00575    const char *mix = astman_get_header(m, "Mix");
00576    char *d;
00577 
00578    if (ast_strlen_zero(name)) {
00579       astman_send_error(s, m, "No channel specified");
00580       return 0;
00581    }
00582    c = ast_get_channel_by_name_locked(name);
00583    if (!c) {
00584       astman_send_error(s, m, "No such channel");
00585       return 0;
00586    }
00587 
00588    if (ast_strlen_zero(fname)) {
00589       /* No filename base specified, default to channel name as per CLI */    
00590       fname = ast_strdupa(c->name);
00591       /* Channels have the format technology/channel_name - have to replace that /  */
00592       if ((d = strchr(fname, '/'))) 
00593          *d = '-';
00594    }
00595 
00596    if (ast_monitor_start(c, format, fname, 1, X_REC_IN | X_REC_OUT)) {
00597       if (ast_monitor_change_fname(c, fname, 1)) {
00598          astman_send_error(s, m, "Could not start monitoring channel");
00599          ast_channel_unlock(c);
00600          return 0;
00601       }
00602    }
00603 
00604    if (ast_true(mix)) {
00605       ast_monitor_setjoinfiles(c, 1);
00606    }
00607 
00608    ast_channel_unlock(c);
00609    astman_send_ack(s, m, "Started monitoring channel");
00610    return 0;
00611 }
00612 
00613 static char stop_monitor_action_help[] =
00614 "Description: The 'StopMonitor' action may be used to end a previously\n"
00615 "  started 'Monitor' action.  The only parameter is 'Channel', the name\n"
00616 "  of the channel monitored.\n";
00617 
00618 /*! \brief Stop monitoring a channel by manager connection */
00619 static int stop_monitor_action(struct mansession *s, const struct message *m)
00620 {
00621    struct ast_channel *c = NULL;
00622    const char *name = astman_get_header(m, "Channel");
00623    int res;
00624    if (ast_strlen_zero(name)) {
00625       astman_send_error(s, m, "No channel specified");
00626       return 0;
00627    }
00628    c = ast_get_channel_by_name_locked(name);
00629    if (!c) {
00630       astman_send_error(s, m, "No such channel");
00631       return 0;
00632    }
00633    res = ast_monitor_stop(c, 1);
00634    ast_channel_unlock(c);
00635    if (res) {
00636       astman_send_error(s, m, "Could not stop monitoring channel");
00637       return 0;
00638    }
00639    astman_send_ack(s, m, "Stopped monitoring channel");
00640    return 0;
00641 }
00642 
00643 static char change_monitor_action_help[] =
00644 "Description: The 'ChangeMonitor' action may be used to change the file\n"
00645 "  started by a previous 'Monitor' action.  The following parameters may\n"
00646 "  be used to control this:\n"
00647 "  Channel     - Required.  Used to specify the channel to record.\n"
00648 "  File        - Required.  Is the new name of the file created in the\n"
00649 "                monitor spool directory.\n";
00650 
00651 /*! \brief Change filename of a monitored channel by manager connection */
00652 static int change_monitor_action(struct mansession *s, const struct message *m)
00653 {
00654    struct ast_channel *c = NULL;
00655    const char *name = astman_get_header(m, "Channel");
00656    const char *fname = astman_get_header(m, "File");
00657    if (ast_strlen_zero(name)) {
00658       astman_send_error(s, m, "No channel specified");
00659       return 0;
00660    }
00661    if (ast_strlen_zero(fname)) {
00662       astman_send_error(s, m, "No filename specified");
00663       return 0;
00664    }
00665    c = ast_get_channel_by_name_locked(name);
00666    if (!c) {
00667       astman_send_error(s, m, "No such channel");
00668       return 0;
00669    }
00670    if (ast_monitor_change_fname(c, fname, 1)) {
00671       astman_send_error(s, m, "Could not change monitored filename of channel");
00672       ast_channel_unlock(c);
00673       return 0;
00674    }
00675    ast_channel_unlock(c);
00676    astman_send_ack(s, m, "Changed monitor filename");
00677    return 0;
00678 }
00679 
00680 void ast_monitor_setjoinfiles(struct ast_channel *chan, int turnon)
00681 {
00682    if (chan->monitor)
00683       chan->monitor->joinfiles = turnon;
00684 }
00685 
00686 enum MONITOR_PAUSING_ACTION
00687 {
00688    MONITOR_ACTION_PAUSE,
00689    MONITOR_ACTION_UNPAUSE
00690 };
00691      
00692 static int do_pause_or_unpause(struct mansession *s, const struct message *m, int action)
00693 {
00694    struct ast_channel *c = NULL;
00695    const char *name = astman_get_header(m, "Channel");
00696    
00697    if (ast_strlen_zero(name)) {
00698       astman_send_error(s, m, "No channel specified");
00699       return -1;
00700    }
00701    
00702    c = ast_get_channel_by_name_locked(name);
00703    if (!c) {
00704       astman_send_error(s, m, "No such channel");
00705       return -1;
00706    }
00707 
00708    if (action == MONITOR_ACTION_PAUSE)
00709       ast_monitor_pause(c);
00710    else
00711       ast_monitor_unpause(c);
00712    
00713    ast_channel_unlock(c);
00714    astman_send_ack(s, m, (action == MONITOR_ACTION_PAUSE ? "Paused monitoring of the channel" : "Unpaused monitoring of the channel"));
00715    return 0;   
00716 }
00717 
00718 static char pause_monitor_action_help[] =
00719    "Description: The 'PauseMonitor' action may be used to temporarily stop the\n"
00720    " recording of a channel.  The following parameters may\n"
00721    " be used to control this:\n"
00722    "  Channel     - Required.  Used to specify the channel to record.\n";
00723 
00724 static int pause_monitor_action(struct mansession *s, const struct message *m)
00725 {
00726    return do_pause_or_unpause(s, m, MONITOR_ACTION_PAUSE);
00727 }
00728 
00729 static char unpause_monitor_action_help[] =
00730    "Description: The 'UnpauseMonitor' action may be used to re-enable recording\n"
00731    "  of a channel after calling PauseMonitor.  The following parameters may\n"
00732    "  be used to control this:\n"
00733    "  Channel     - Required.  Used to specify the channel to record.\n";
00734 
00735 static int unpause_monitor_action(struct mansession *s, const struct message *m)
00736 {
00737    return do_pause_or_unpause(s, m, MONITOR_ACTION_UNPAUSE);
00738 }
00739    
00740 
00741 static int load_module(void)
00742 {
00743    ast_register_application("Monitor", start_monitor_exec, monitor_synopsis, monitor_descrip);
00744    ast_register_application("StopMonitor", stop_monitor_exec, stopmonitor_synopsis, stopmonitor_descrip);
00745    ast_register_application("ChangeMonitor", change_monitor_exec, changemonitor_synopsis, changemonitor_descrip);
00746    ast_register_application("PauseMonitor", pause_monitor_exec, pausemonitor_synopsis, pausemonitor_descrip);
00747    ast_register_application("UnpauseMonitor", unpause_monitor_exec, unpausemonitor_synopsis, unpausemonitor_descrip);
00748    ast_manager_register2("Monitor", EVENT_FLAG_CALL, start_monitor_action, monitor_synopsis, start_monitor_action_help);
00749    ast_manager_register2("StopMonitor", EVENT_FLAG_CALL, stop_monitor_action, stopmonitor_synopsis, stop_monitor_action_help);
00750    ast_manager_register2("ChangeMonitor", EVENT_FLAG_CALL, change_monitor_action, changemonitor_synopsis, change_monitor_action_help);
00751    ast_manager_register2("PauseMonitor", EVENT_FLAG_CALL, pause_monitor_action, pausemonitor_synopsis, pause_monitor_action_help);
00752    ast_manager_register2("UnpauseMonitor", EVENT_FLAG_CALL, unpause_monitor_action, unpausemonitor_synopsis, unpause_monitor_action_help);
00753 
00754    return AST_MODULE_LOAD_SUCCESS;
00755 }
00756 
00757 static int unload_module(void)
00758 {
00759    ast_unregister_application("Monitor");
00760    ast_unregister_application("StopMonitor");
00761    ast_unregister_application("ChangeMonitor");
00762    ast_unregister_application("PauseMonitor");
00763    ast_unregister_application("UnpauseMonitor");
00764    ast_manager_unregister("Monitor");
00765    ast_manager_unregister("StopMonitor");
00766    ast_manager_unregister("ChangeMonitor");
00767    ast_manager_unregister("PauseMonitor");
00768    ast_manager_unregister("UnpauseMonitor");
00769 
00770    return 0;
00771 }
00772 
00773 /* usecount semantics need to be defined */
00774 AST_MODULE_INFO(ASTERISK_GPL_KEY, AST_MODFLAG_GLOBAL_SYMBOLS, "Call Monitoring Resource",
00775       .load = load_module,
00776       .unload = unload_module,
00777       );

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