Wed Oct 28 11:50:56 2009

Asterisk developer's documentation


cdr_custom.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  * Includes code and algorithms from the Zapata library.
00009  *
00010  * See http://www.asterisk.org for more information about
00011  * the Asterisk project. Please do not directly contact
00012  * any of the maintainers of this project for assistance;
00013  * the project provides a web site, mailing lists and IRC
00014  * channels for your use.
00015  *
00016  * This program is free software, distributed under the terms of
00017  * the GNU General Public License Version 2. See the LICENSE file
00018  * at the top of the source tree.
00019  */
00020 
00021 /*! \file
00022  *
00023  * \brief Custom Comma Separated Value CDR records.
00024  *
00025  * \author Mark Spencer <markster@digium.com>
00026  *
00027  * \arg See also \ref AstCDR
00028  *
00029  * Logs in LOG_DIR/cdr_custom
00030  * \ingroup cdr_drivers
00031  */
00032 
00033 #include "asterisk.h"
00034 
00035 ASTERISK_FILE_VERSION(__FILE__, "$Revision: 158135 $")
00036 
00037 #include <time.h>
00038 
00039 #include "asterisk/paths.h"   /* use ast_config_AST_LOG_DIR */
00040 #include "asterisk/channel.h"
00041 #include "asterisk/cdr.h"
00042 #include "asterisk/module.h"
00043 #include "asterisk/config.h"
00044 #include "asterisk/pbx.h"
00045 #include "asterisk/utils.h"
00046 #include "asterisk/lock.h"
00047 
00048 #define CUSTOM_LOG_DIR "/cdr_custom"
00049 
00050 #define DATE_FORMAT "%Y-%m-%d %T"
00051 
00052 AST_MUTEX_DEFINE_STATIC(lock);
00053 AST_MUTEX_DEFINE_STATIC(mf_lock);
00054 
00055 static char *name = "cdr-custom";
00056 
00057 static char master[PATH_MAX];
00058 static char format[1024]="";
00059 
00060 static int load_config(int reload)
00061 {
00062    struct ast_config *cfg;
00063    struct ast_variable *var;
00064    struct ast_flags config_flags = { reload ? CONFIG_FLAG_FILEUNCHANGED : 0 };
00065    int res = -1;
00066 
00067    if ((cfg = ast_config_load("cdr_custom.conf", config_flags)) == CONFIG_STATUS_FILEUNCHANGED)
00068       return 0;
00069 
00070    strcpy(format, "");
00071    strcpy(master, "");
00072    ast_mutex_lock(&lock);
00073    if (cfg) {
00074       var = ast_variable_browse(cfg, "mappings");
00075       while(var) {
00076          if (!ast_strlen_zero(var->name) && !ast_strlen_zero(var->value)) {
00077             if (strlen(var->value) > (sizeof(format) - 1))
00078                ast_log(LOG_WARNING, "Format string too long, will be truncated, at line %d\n", var->lineno);
00079             ast_copy_string(format, var->value, sizeof(format) - 1);
00080             strcat(format,"\n");
00081             snprintf(master, sizeof(master),"%s/%s/%s", ast_config_AST_LOG_DIR, name, var->name);
00082             if (var->next) {
00083                ast_log(LOG_NOTICE, "Sorry, only one mapping is supported at this time, mapping '%s' will be ignored at line %d.\n", var->next->name, var->next->lineno);
00084                break;
00085             }
00086          } else
00087             ast_log(LOG_NOTICE, "Mapping must have both filename and format at line %d\n", var->lineno);
00088          var = var->next;
00089       }
00090       ast_config_destroy(cfg);
00091       res = 0;
00092    } else {
00093       if (reload)
00094          ast_log(LOG_WARNING, "Failed to reload configuration file.\n");
00095       else
00096          ast_log(LOG_WARNING, "Failed to load configuration file. Module not activated.\n");
00097    }
00098    ast_mutex_unlock(&lock);
00099 
00100    return res;
00101 }
00102 
00103 
00104 
00105 static int custom_log(struct ast_cdr *cdr)
00106 {
00107    FILE *mf = NULL;
00108 
00109    /* Make sure we have a big enough buf */
00110    char buf[2048];
00111    struct ast_channel dummy;
00112 
00113    /* Abort if no master file is specified */
00114    if (ast_strlen_zero(master))
00115       return 0;
00116 
00117    /* Quite possibly the first use of a static struct ast_channel, we need it so the var funcs will work */
00118    memset(&dummy, 0, sizeof(dummy));
00119    dummy.cdr = cdr;
00120    pbx_substitute_variables_helper(&dummy, format, buf, sizeof(buf) - 1);
00121 
00122    /* because of the absolutely unconditional need for the
00123       highest reliability possible in writing billing records,
00124       we open write and close the log file each time */
00125    ast_mutex_lock(&mf_lock);
00126    mf = fopen(master, "a");
00127    if (mf) {
00128       fputs(buf, mf);
00129       fflush(mf); /* be particularly anal here */
00130       fclose(mf);
00131       mf = NULL;
00132       ast_mutex_unlock(&mf_lock);
00133    } else {
00134       ast_log(LOG_ERROR, "Unable to re-open master file %s : %s\n", master, strerror(errno));
00135       ast_mutex_unlock(&mf_lock);
00136    }
00137 
00138    return 0;
00139 }
00140 
00141 static int unload_module(void)
00142 {
00143    ast_cdr_unregister(name);
00144    return 0;
00145 }
00146 
00147 static int load_module(void)
00148 {
00149    int res = 0;
00150 
00151    if (!load_config(0)) {
00152       res = ast_cdr_register(name, ast_module_info->description, custom_log);
00153       if (res)
00154          ast_log(LOG_ERROR, "Unable to register custom CDR handling\n");
00155       return res;
00156    } else
00157       return AST_MODULE_LOAD_DECLINE;
00158 }
00159 
00160 static int reload(void)
00161 {
00162    return load_config(1);
00163 }
00164 
00165 AST_MODULE_INFO(ASTERISK_GPL_KEY, AST_MODFLAG_DEFAULT, "Customizable Comma Separated Values CDR Backend",
00166       .load = load_module,
00167       .unload = unload_module,
00168       .reload = reload,
00169           );
00170 

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