Mon Mar 31 07:38:04 2008

Asterisk developer's documentation


pbx_spool.c

Go to the documentation of this file.
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 Full-featured outgoing call spool support
00022  * 
00023  */
00024 
00025 #include "asterisk.h"
00026 
00027 ASTERISK_FILE_VERSION(__FILE__, "$Revision$")
00028 
00029 #include <sys/stat.h>
00030 #include <errno.h>
00031 #include <time.h>
00032 #include <utime.h>
00033 #include <stdlib.h>
00034 #include <unistd.h>
00035 #include <dirent.h>
00036 #include <string.h>
00037 #include <string.h>
00038 #include <stdio.h>
00039 #include <unistd.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/callerid.h"
00046 #include "asterisk/pbx.h"
00047 #include "asterisk/module.h"
00048 #include "asterisk/options.h"
00049 #include "asterisk/utils.h"
00050 
00051 /*
00052  * pbx_spool is similar in spirit to qcall, but with substantially enhanced functionality...
00053  * The spool file contains a header 
00054  */
00055 
00056 enum {
00057    /*! Always delete the call file after a call succeeds or the
00058     * maximum number of retries is exceeded, even if the
00059     * modification time of the call file is in the future.
00060     */
00061    SPOOL_FLAG_ALWAYS_DELETE = (1 << 0),
00062    /* Don't unlink the call file after processing, move in qdonedir */
00063    SPOOL_FLAG_ARCHIVE = (1 << 1)
00064 };
00065 
00066 static char qdir[255];
00067 static char qdonedir[255];
00068 
00069 struct outgoing {
00070    char fn[256];
00071    /* Current number of retries */
00072    int retries;
00073    /* Maximum number of retries permitted */
00074    int maxretries;
00075    /* How long to wait between retries (in seconds) */
00076    int retrytime;
00077    /* How long to wait for an answer */
00078    int waittime;
00079    /* PID which is currently calling */
00080    long callingpid;
00081    
00082    /* What to connect to outgoing */
00083    char tech[256];
00084    char dest[256];
00085    
00086    /* If application */
00087    char app[256];
00088    char data[256];
00089 
00090    /* If extension/context/priority */
00091    char exten[256];
00092    char context[256];
00093    int priority;
00094 
00095    /* CallerID Information */
00096    char cid_num[256];
00097    char cid_name[256];
00098 
00099    /* account code */
00100    char account[AST_MAX_ACCOUNT_CODE];
00101 
00102    /* Variables and Functions */
00103    struct ast_variable *vars;
00104    
00105    /* Maximum length of call */
00106    int maxlen;
00107 
00108    /* options */
00109    struct ast_flags options;
00110 };
00111 
00112 static void init_outgoing(struct outgoing *o)
00113 {
00114    memset(o, 0, sizeof(struct outgoing));
00115    o->priority = 1;
00116    o->retrytime = 300;
00117    o->waittime = 45;
00118    ast_set_flag(&o->options, SPOOL_FLAG_ALWAYS_DELETE);
00119 }
00120 
00121 static void free_outgoing(struct outgoing *o)
00122 {
00123    free(o);
00124 }
00125 
00126 static int apply_outgoing(struct outgoing *o, char *fn, FILE *f)
00127 {
00128    char buf[256];
00129    char *c, *c2;
00130    int lineno = 0;
00131    struct ast_variable *var;
00132 
00133    while(fgets(buf, sizeof(buf), f)) {
00134       lineno++;
00135       /* Trim comments */
00136       c = buf;
00137       while ((c = strchr(c, '#'))) {
00138          if ((c == buf) || (*(c-1) == ' ') || (*(c-1) == '\t'))
00139             *c = '\0';
00140          else
00141             c++;
00142       }
00143 
00144       c = buf;
00145       while ((c = strchr(c, ';'))) {
00146          if ((c > buf) && (c[-1] == '\\')) {
00147             memmove(c - 1, c, strlen(c) + 1);
00148             c++;
00149          } else {
00150             *c = '\0';
00151             break;
00152          }
00153       }
00154 
00155       /* Trim trailing white space */
00156       while(!ast_strlen_zero(buf) && buf[strlen(buf) - 1] < 33)
00157          buf[strlen(buf) - 1] = '\0';
00158       if (!ast_strlen_zero(buf)) {
00159          c = strchr(buf, ':');
00160          if (c) {
00161             *c = '\0';
00162             c++;
00163             while ((*c) && (*c < 33))
00164                c++;
00165 #if 0
00166             printf("'%s' is '%s' at line %d\n", buf, c, lineno);
00167 #endif
00168             if (!strcasecmp(buf, "channel")) {
00169                ast_copy_string(o->tech, c, sizeof(o->tech));
00170                if ((c2 = strchr(o->tech, '/'))) {
00171                   *c2 = '\0';
00172                   c2++;
00173                   ast_copy_string(o->dest, c2, sizeof(o->dest));
00174                } else {
00175                   ast_log(LOG_NOTICE, "Channel should be in form Tech/Dest at line %d of %s\n", lineno, fn);
00176                   o->tech[0] = '\0';
00177                }
00178             } else if (!strcasecmp(buf, "callerid")) {
00179                ast_callerid_split(c, o->cid_name, sizeof(o->cid_name), o->cid_num, sizeof(o->cid_num));
00180             } else if (!strcasecmp(buf, "application")) {
00181                ast_copy_string(o->app, c, sizeof(o->app));
00182             } else if (!strcasecmp(buf, "data")) {
00183                ast_copy_string(o->data, c, sizeof(o->data));
00184             } else if (!strcasecmp(buf, "maxretries")) {
00185                if (sscanf(c, "%d", &o->maxretries) != 1) {
00186                   ast_log(LOG_WARNING, "Invalid max retries at line %d of %s\n", lineno, fn);
00187                   o->maxretries = 0;
00188                }
00189             } else if (!strcasecmp(buf, "context")) {
00190                ast_copy_string(o->context, c, sizeof(o->context));
00191             } else if (!strcasecmp(buf, "extension")) {
00192                ast_copy_string(o->exten, c, sizeof(o->exten));
00193             } else if (!strcasecmp(buf, "priority")) {
00194                if ((sscanf(c, "%d", &o->priority) != 1) || (o->priority < 1)) {
00195                   ast_log(LOG_WARNING, "Invalid priority at line %d of %s\n", lineno, fn);
00196                   o->priority = 1;
00197                }
00198             } else if (!strcasecmp(buf, "retrytime")) {
00199                if ((sscanf(c, "%d", &o->retrytime) != 1) || (o->retrytime < 1)) {
00200                   ast_log(LOG_WARNING, "Invalid retrytime at line %d of %s\n", lineno, fn);
00201                   o->retrytime = 300;
00202                }
00203             } else if (!strcasecmp(buf, "waittime")) {
00204                if ((sscanf(c, "%d", &o->waittime) != 1) || (o->waittime < 1)) {
00205                   ast_log(LOG_WARNING, "Invalid waittime at line %d of %s\n", lineno, fn);
00206                   o->waittime = 45;
00207                }
00208             } else if (!strcasecmp(buf, "retry")) {
00209                o->retries++;
00210             } else if (!strcasecmp(buf, "startretry")) {
00211                if (sscanf(c, "%ld", &o->callingpid) != 1) {
00212                   ast_log(LOG_WARNING, "Unable to retrieve calling PID!\n");
00213                   o->callingpid = 0;
00214                }
00215             } else if (!strcasecmp(buf, "endretry") || !strcasecmp(buf, "abortretry")) {
00216                o->callingpid = 0;
00217                o->retries++;
00218             } else if (!strcasecmp(buf, "delayedretry")) {
00219             } else if (!strcasecmp(buf, "setvar") || !strcasecmp(buf, "set")) {
00220                c2 = c;
00221                strsep(&c2, "=");
00222                if (c2) {
00223                   var = ast_variable_new(c, c2);
00224                   if (var) {
00225                      var->next = o->vars;
00226                      o->vars = var;
00227                   }
00228                } else
00229                   ast_log(LOG_WARNING, "Malformed \"%s\" argument.  Should be \"%s: variable=value\"\n", buf, buf);
00230             } else if (!strcasecmp(buf, "account")) {
00231                ast_copy_string(o->account, c, sizeof(o->account));
00232             } else if (!strcasecmp(buf, "alwaysdelete")) {
00233                ast_set2_flag(&o->options, ast_true(c), SPOOL_FLAG_ALWAYS_DELETE);
00234             } else if (!strcasecmp(buf, "archive")) {
00235                ast_set2_flag(&o->options, ast_true(c), SPOOL_FLAG_ARCHIVE);
00236             } else {
00237                ast_log(LOG_WARNING, "Unknown keyword '%s' at line %d of %s\n", buf, lineno, fn);
00238             }
00239          } else
00240             ast_log(LOG_NOTICE, "Syntax error at line %d of %s\n", lineno, fn);
00241       }
00242    }
00243    ast_copy_string(o->fn, fn, sizeof(o->fn));
00244    if (ast_strlen_zero(o->tech) || ast_strlen_zero(o->dest) || (ast_strlen_zero(o->app) && ast_strlen_zero(o->exten))) {
00245       ast_log(LOG_WARNING, "At least one of app or extension must be specified, along with tech and dest in file %s\n", fn);
00246       return -1;
00247    }
00248    return 0;
00249 }
00250 
00251 static void safe_append(struct outgoing *o, time_t now, char *s)
00252 {
00253    int fd;
00254    FILE *f;
00255    struct utimbuf tbuf;
00256    fd = open(o->fn, O_WRONLY|O_APPEND);
00257    if (fd > -1) {
00258       f = fdopen(fd, "a");
00259       if (f) {
00260          fprintf(f, "\n%s: %ld %d (%ld)\n", s, (long)ast_mainpid, o->retries, (long) now);
00261          fclose(f);
00262       } else
00263          close(fd);
00264       /* Update the file time */
00265       tbuf.actime = now;
00266       tbuf.modtime = now + o->retrytime;
00267       if (utime(o->fn, &tbuf))
00268          ast_log(LOG_WARNING, "Unable to set utime on %s: %s\n", o->fn, strerror(errno));
00269    }
00270 }
00271 
00272 /*!
00273  * \brief Remove a call file from the outgoing queue optionally moving it in the archive dir
00274  *
00275  * \param o the pointer to outgoing struct
00276  * \param status the exit status of the call. Can be "Completed", "Failed" or "Expired"
00277  */
00278 static int remove_from_queue(struct outgoing *o, const char *status)
00279 {
00280    int fd;
00281    FILE *f;
00282    char newfn[256];
00283    const char *bname;
00284 
00285    if (!ast_test_flag(&o->options, SPOOL_FLAG_ALWAYS_DELETE)) {
00286       struct stat current_file_status;
00287 
00288       if (!stat(o->fn, &current_file_status))
00289          if (time(NULL) < current_file_status.st_mtime)
00290             return 0;
00291    }
00292 
00293    if (!ast_test_flag(&o->options, SPOOL_FLAG_ARCHIVE)) {
00294       unlink(o->fn);
00295       return 0;
00296    }
00297    if (mkdir(qdonedir, 0700) && (errno != EEXIST)) {
00298       ast_log(LOG_WARNING, "Unable to create queue directory %s -- outgoing spool archiving disabled\n", qdonedir);
00299       unlink(o->fn);
00300       return -1;
00301    }
00302    fd = open(o->fn, O_WRONLY|O_APPEND);
00303    if (fd > -1) {
00304       f = fdopen(fd, "a");
00305       if (f) {
00306          fprintf(f, "Status: %s\n", status);
00307          fclose(f);
00308       } else
00309          close(fd);
00310    }
00311 
00312    bname = strrchr(o->fn,'/');
00313    if (bname == NULL) 
00314       bname = o->fn;
00315    else 
00316       bname++; 
00317    snprintf(newfn, sizeof(newfn), "%s/%s", qdonedir, bname);
00318    /* a existing call file the archive dir is overwritten */
00319    unlink(newfn);
00320    if (rename(o->fn, newfn) != 0) {
00321       unlink(o->fn);
00322       return -1;
00323    } else
00324       return 0;
00325 }
00326 
00327 static void *attempt_thread(void *data)
00328 {
00329    struct outgoing *o = data;
00330    int res, reason;
00331    if (!ast_strlen_zero(o->app)) {
00332       if (option_verbose > 2)
00333          ast_verbose(VERBOSE_PREFIX_3 "Attempting call on %s/%s for application %s(%s) (Retry %d)\n", o->tech, o->dest, o->app, o->data, o->retries);
00334       res = ast_pbx_outgoing_app(o->tech, AST_FORMAT_SLINEAR, o->dest, o->waittime * 1000, o->app, o->data, &reason, 2 /* wait to finish */, o->cid_num, o->cid_name, o->vars, o->account, NULL);
00335    } else {
00336       if (option_verbose > 2)
00337          ast_verbose(VERBOSE_PREFIX_3 "Attempting call on %s/%s for %s@%s:%d (Retry %d)\n", o->tech, o->dest, o->exten, o->context,o->priority, o->retries);
00338       res = ast_pbx_outgoing_exten(o->tech, AST_FORMAT_SLINEAR, o->dest, o->waittime * 1000, o->context, o->exten, o->priority, &reason, 2 /* wait to finish */, o->cid_num, o->cid_name, o->vars, o->account, NULL);
00339    }
00340    if (res) {
00341       ast_log(LOG_NOTICE, "Call failed to go through, reason (%d) %s\n", reason, ast_channel_reason2str(reason));
00342       if (o->retries >= o->maxretries + 1) {
00343          /* Max retries exceeded */
00344          ast_log(LOG_EVENT, "Queued call to %s/%s expired without completion after %d attempt%s\n", o->tech, o->dest, o->retries - 1, ((o->retries - 1) != 1) ? "s" : "");
00345          remove_from_queue(o, "Expired");
00346       } else {
00347          /* Notate that the call is still active */
00348          safe_append(o, time(NULL), "EndRetry");
00349       }
00350    } else {
00351       ast_log(LOG_NOTICE, "Call completed to %s/%s\n", o->tech, o->dest);
00352       ast_log(LOG_EVENT, "Queued call to %s/%s completed\n", o->tech, o->dest);
00353       remove_from_queue(o, "Completed");
00354    }
00355    free_outgoing(o);
00356    return NULL;
00357 }
00358 
00359 static void launch_service(struct outgoing *o)
00360 {
00361    pthread_t t;
00362    pthread_attr_t attr;
00363    int ret;
00364    pthread_attr_init(&attr);
00365    pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED);
00366    if ((ret = ast_pthread_create(&t,&attr,attempt_thread, o)) != 0) {
00367       ast_log(LOG_WARNING, "Unable to create thread :( (returned error: %d)\n", ret);
00368       free_outgoing(o);
00369    }
00370    pthread_attr_destroy(&attr);
00371 }
00372 
00373 static int scan_service(char *fn, time_t now, time_t atime)
00374 {
00375    struct outgoing *o;
00376    FILE *f;
00377    o = malloc(sizeof(struct outgoing));
00378    if (o) {
00379       init_outgoing(o);
00380       f = fopen(fn, "r+");
00381       if (f) {
00382          if (!apply_outgoing(o, fn, f)) {
00383 #if 0
00384             printf("Filename: %s, Retries: %d, max: %d\n", fn, o->retries, o->maxretries);
00385 #endif
00386             fclose(f);
00387             if (o->retries <= o->maxretries) {
00388                now += o->retrytime;
00389                if (o->callingpid && (o->callingpid == ast_mainpid)) {
00390                   safe_append(o, time(NULL), "DelayedRetry");
00391                   ast_log(LOG_DEBUG, "Delaying retry since we're currently running '%s'\n", o->fn);
00392                   free_outgoing(o);
00393                } else {
00394                   /* Increment retries */
00395                   o->retries++;
00396                   /* If someone else was calling, they're presumably gone now
00397                      so abort their retry and continue as we were... */
00398                   if (o->callingpid)
00399                      safe_append(o, time(NULL), "AbortRetry");
00400 
00401                   safe_append(o, now, "StartRetry");
00402                   launch_service(o);
00403                }
00404                return now;
00405             } else {
00406                ast_log(LOG_EVENT, "Queued call to %s/%s expired without completion after %d attempt%s\n", o->tech, o->dest, o->retries - 1, ((o->retries - 1) != 1) ? "s" : "");
00407                free_outgoing(o);
00408                remove_from_queue(o, "Expired");
00409                return 0;
00410             }
00411          } else {
00412             free_outgoing(o);
00413             ast_log(LOG_WARNING, "Invalid file contents in %s, deleting\n", fn);
00414             fclose(f);
00415             remove_from_queue(o, "Failed");
00416          }
00417       } else {
00418          free_outgoing(o);
00419          ast_log(LOG_WARNING, "Unable to open %s: %s, deleting\n", fn, strerror(errno));
00420          remove_from_queue(o, "Failed");
00421       }
00422    } else
00423       ast_log(LOG_WARNING, "Out of memory :(\n");
00424    return -1;
00425 }
00426 
00427 static void *scan_thread(void *unused)
00428 {
00429    struct stat st;
00430    DIR *dir;
00431    struct dirent *de;
00432    char fn[256];
00433    int res;
00434    time_t last = 0, next = 0, now;
00435    for(;;) {
00436       /* Wait a sec */
00437       sleep(1);
00438       time(&now);
00439       if (!stat(qdir, &st)) {
00440          if ((st.st_mtime != last) || (next && (now > next))) {
00441 #if 0
00442             printf("atime: %ld, mtime: %ld, ctime: %ld\n", st.st_atime, st.st_mtime, st.st_ctime);
00443             printf("Ooh, something changed / timeout\n");
00444 #endif            
00445             next = 0;
00446             last = st.st_mtime;
00447             dir = opendir(qdir);
00448             if (dir) {
00449                while((de = readdir(dir))) {
00450                   snprintf(fn, sizeof(fn), "%s/%s", qdir, de->d_name);
00451                   if (!stat(fn, &st)) {
00452                      if (S_ISREG(st.st_mode)) {
00453                         if (st.st_mtime <= now) {
00454                            res = scan_service(fn, now, st.st_atime);
00455                            if (res > 0) {
00456                               /* Update next service time */
00457                               if (!next || (res < next)) {
00458                                  next = res;
00459                               }
00460                            } else if (res)
00461                               ast_log(LOG_WARNING, "Failed to scan service '%s'\n", fn);
00462                         } else {
00463                            /* Update "next" update if necessary */
00464                            if (!next || (st.st_mtime < next))
00465                               next = st.st_mtime;
00466                         }
00467                      }
00468                   } else
00469                      ast_log(LOG_WARNING, "Unable to stat %s: %s\n", fn, strerror(errno));
00470                }
00471                closedir(dir);
00472             } else
00473                ast_log(LOG_WARNING, "Unable to open directory %s: %s\n", qdir, strerror(errno));
00474          }
00475       } else
00476          ast_log(LOG_WARNING, "Unable to stat %s\n", qdir);
00477    }
00478    return NULL;
00479 }
00480 
00481 static int unload_module(void)
00482 {
00483    return -1;
00484 }
00485 
00486 static int load_module(void)
00487 {
00488    pthread_t thread;
00489    pthread_attr_t attr;
00490    int ret;
00491    snprintf(qdir, sizeof(qdir), "%s/%s", ast_config_AST_SPOOL_DIR, "outgoing");
00492    if (mkdir(qdir, 0700) && (errno != EEXIST)) {
00493       ast_log(LOG_WARNING, "Unable to create queue directory %s -- outgoing spool disabled\n", qdir);
00494       return 0;
00495    }
00496    snprintf(qdonedir, sizeof(qdir), "%s/%s", ast_config_AST_SPOOL_DIR, "outgoing_done");
00497    pthread_attr_init(&attr);
00498    pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED);
00499    if ((ret = ast_pthread_create_background(&thread,&attr,scan_thread, NULL)) != 0) {
00500       ast_log(LOG_WARNING, "Unable to create thread :( (returned error: %d)\n", ret);
00501       return -1;
00502    }
00503    pthread_attr_destroy(&attr);
00504    return 0;
00505 }
00506 
00507 AST_MODULE_INFO_STANDARD(ASTERISK_GPL_KEY, "Outgoing Spool Support");

Generated on Mon Mar 31 07:38:04 2008 for Asterisk - the Open Source PBX by  doxygen 1.5.1