Wed Aug 15 01:24:16 2007

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: 70841 $")
00036 
00037 #include <sys/types.h>
00038 #include <stdio.h>
00039 #include <string.h>
00040 #include <errno.h>
00041 
00042 #include <stdlib.h>
00043 #include <unistd.h>
00044 #include <time.h>
00045 
00046 #include "asterisk/channel.h"
00047 #include "asterisk/cdr.h"
00048 #include "asterisk/module.h"
00049 #include "asterisk/config.h"
00050 #include "asterisk/pbx.h"
00051 #include "asterisk/logger.h"
00052 #include "asterisk/utils.h"
00053 
00054 #define CUSTOM_LOG_DIR "/cdr_custom"
00055 
00056 #define DATE_FORMAT "%Y-%m-%d %T"
00057 
00058 AST_MUTEX_DEFINE_STATIC(lock);
00059 
00060 static char *name = "cdr-custom";
00061 
00062 static FILE *mf = NULL;
00063 
00064 static char master[PATH_MAX];
00065 static char format[1024]="";
00066 
00067 static int load_config(int reload) 
00068 {
00069    struct ast_config *cfg;
00070    struct ast_variable *var;
00071    int res = -1;
00072 
00073    strcpy(format, "");
00074    strcpy(master, "");
00075    ast_mutex_lock(&lock);
00076    if((cfg = ast_config_load("cdr_custom.conf"))) {
00077       var = ast_variable_browse(cfg, "mappings");
00078       while(var) {
00079          if (!ast_strlen_zero(var->name) && !ast_strlen_zero(var->value)) {
00080             if (strlen(var->value) > (sizeof(format) - 1))
00081                ast_log(LOG_WARNING, "Format string too long, will be truncated, at line %d\n", var->lineno);
00082             ast_copy_string(format, var->value, sizeof(format) - 1);
00083             strcat(format,"\n");
00084             snprintf(master, sizeof(master),"%s/%s/%s", ast_config_AST_LOG_DIR, name, var->name);
00085             if (var->next) {
00086                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); 
00087                break;
00088             }
00089          } else
00090             ast_log(LOG_NOTICE, "Mapping must have both filename and format at line %d\n", var->lineno);
00091          var = var->next;
00092       }
00093       ast_config_destroy(cfg);
00094       res = 0;
00095    } else {
00096       if (reload)
00097          ast_log(LOG_WARNING, "Failed to reload configuration file.\n");
00098       else
00099          ast_log(LOG_WARNING, "Failed to load configuration file. Module not activated.\n");
00100    }
00101    ast_mutex_unlock(&lock);
00102    
00103    return res;
00104 }
00105 
00106 
00107 
00108 static int custom_log(struct ast_cdr *cdr)
00109 {
00110    /* Make sure we have a big enough buf */
00111    char buf[2048];
00112    struct ast_channel dummy;
00113 
00114    /* Abort if no master file is specified */
00115    if (ast_strlen_zero(master))
00116       return 0;
00117 
00118    memset(buf, 0 , sizeof(buf));
00119    /* Quite possibly the first use of a static struct ast_channel, we need it so the var funcs will work */
00120    memset(&dummy, 0, sizeof(dummy));
00121    dummy.cdr = cdr;
00122    pbx_substitute_variables_helper(&dummy, format, buf, sizeof(buf) - 1);
00123 
00124    /* because of the absolutely unconditional need for the
00125       highest reliability possible in writing billing records,
00126       we open write and close the log file each time */
00127    mf = fopen(master, "a");
00128    if (!mf) {
00129       ast_log(LOG_ERROR, "Unable to re-open master file %s : %s\n", master, strerror(errno));
00130    }
00131    if (mf) {
00132       fputs(buf, mf);
00133       fflush(mf); /* be particularly anal here */
00134       fclose(mf);
00135       mf = NULL;
00136    }
00137    return 0;
00138 }
00139 
00140 static int unload_module(void)
00141 {
00142    if (mf)
00143       fclose(mf);
00144    ast_cdr_unregister(name);
00145    return 0;
00146 }
00147 
00148 static int load_module(void)
00149 {
00150    int res = 0;
00151 
00152    if (!load_config(0)) {
00153       res = ast_cdr_register(name, ast_module_info->description, custom_log);
00154       if (res)
00155          ast_log(LOG_ERROR, "Unable to register custom CDR handling\n");
00156       if (mf)
00157          fclose(mf);
00158       return res;
00159    } else 
00160       return AST_MODULE_LOAD_DECLINE;
00161 }
00162 
00163 static int reload(void)
00164 {
00165    return load_config(1);
00166 }
00167 
00168 AST_MODULE_INFO(ASTERISK_GPL_KEY, AST_MODFLAG_DEFAULT, "Customizable Comma Separated Values CDR Backend",
00169       .load = load_module,
00170       .unload = unload_module,
00171       .reload = reload,
00172           );
00173 

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