Sat Aug 6 00:39:23 2011

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: 110779 $")
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 #include "asterisk/lock.h"
00054 
00055 #define CUSTOM_LOG_DIR "/cdr_custom"
00056 
00057 #define DATE_FORMAT "%Y-%m-%d %T"
00058 
00059 AST_MUTEX_DEFINE_STATIC(lock);
00060 AST_MUTEX_DEFINE_STATIC(mf_lock);
00061 
00062 static char *name = "cdr-custom";
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    FILE *mf = NULL;
00111 
00112    /* Make sure we have a big enough buf */
00113    char buf[2048];
00114    struct ast_channel dummy;
00115 
00116    /* Abort if no master file is specified */
00117    if (ast_strlen_zero(master))
00118       return 0;
00119 
00120    memset(buf, 0 , sizeof(buf));
00121    /* Quite possibly the first use of a static struct ast_channel, we need it so the var funcs will work */
00122    memset(&dummy, 0, sizeof(dummy));
00123    dummy.cdr = cdr;
00124    pbx_substitute_variables_helper(&dummy, format, buf, sizeof(buf) - 1);
00125 
00126    /* because of the absolutely unconditional need for the
00127       highest reliability possible in writing billing records,
00128       we open write and close the log file each time */
00129    ast_mutex_lock(&mf_lock);
00130    mf = fopen(master, "a");
00131    if (mf) {
00132       fputs(buf, mf);
00133       fflush(mf); /* be particularly anal here */
00134       fclose(mf);
00135       mf = NULL;
00136       ast_mutex_unlock(&mf_lock);
00137    } else {
00138       ast_log(LOG_ERROR, "Unable to re-open master file %s : %s\n", master, strerror(errno));
00139       ast_mutex_unlock(&mf_lock);
00140    }
00141 
00142    return 0;
00143 }
00144 
00145 static int unload_module(void)
00146 {
00147    ast_cdr_unregister(name);
00148    return 0;
00149 }
00150 
00151 static int load_module(void)
00152 {
00153    int res = 0;
00154 
00155    if (!load_config(0)) {
00156       res = ast_cdr_register(name, ast_module_info->description, custom_log);
00157       if (res)
00158          ast_log(LOG_ERROR, "Unable to register custom CDR handling\n");
00159       return res;
00160    } else 
00161       return AST_MODULE_LOAD_DECLINE;
00162 }
00163 
00164 static int reload(void)
00165 {
00166    return load_config(1);
00167 }
00168 
00169 AST_MODULE_INFO(ASTERISK_GPL_KEY, AST_MODFLAG_DEFAULT, "Customizable Comma Separated Values CDR Backend",
00170       .load = load_module,
00171       .unload = unload_module,
00172       .reload = reload,
00173           );
00174 

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