337 lines
6.9 KiB
C
337 lines
6.9 KiB
C
/**
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* @file logger.c
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*
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* @brief Implementation of logger_t.
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*
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*/
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/*
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* Copyright (C) 2005 Jan Hutter, Martin Willi
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* Hochschule fuer Technik Rapperswil
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* for more details.
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*/
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#include <syslog.h>
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#include <stdarg.h>
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#include <string.h>
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#include <stdio.h>
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#include <time.h>
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#include <pthread.h>
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#include "logger.h"
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#include <daemon.h>
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#include <utils/allocator.h>
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/**
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* Maximum length of a log entry (only used for logger_s.log).
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*/
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#define MAX_LOG 8192
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typedef struct private_logger_t private_logger_t;
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/**
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* @brief Private data of a logger_t object.
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*/
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struct private_logger_t {
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/**
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* Public data.
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*/
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logger_t public;
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/**
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* Detail-level of logger.
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*/
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logger_level_t level;
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/**
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* Name of logger.
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*/
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char *name;
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/**
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* File to write log output to.
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* NULL for syslog.
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*/
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FILE *output;
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/**
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* Should a thread_id be included in the log?
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*/
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bool log_thread_id;
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/**
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* Applies a prefix to string and stores it in buffer.
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*
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* @warning: buffer must be at least have MAX_LOG size.
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*/
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void (*prepend_prefix) (private_logger_t *this, logger_level_t loglevel, char *string, char *buffer);
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};
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/**
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* Implementation of private_logger_t.prepend_prefix.
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*/
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static void prepend_prefix(private_logger_t *this, logger_level_t loglevel, char *string, char *buffer)
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{
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char log_type, log_details;
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if (loglevel & CONTROL)
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{
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log_type = '~';
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}
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else if (loglevel & ERROR)
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{
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log_type = '!';
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}
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else if (loglevel & RAW)
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{
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log_type = '#';
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}
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else if (loglevel & PRIVATE)
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{
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log_type = '?';
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}
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else if (loglevel & AUDIT)
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{
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log_type = '>';
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}
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else
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{
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log_type = '-';
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}
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if (loglevel & (LEVEL3 - LEVEL2))
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{
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log_details = '3';
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}
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else if (loglevel & (LEVEL2 - LEVEL1))
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{
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log_details = '2';
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}
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else if (loglevel & LEVEL1)
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{
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log_details = '1';
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}
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else
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{
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log_details = '0';
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}
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if (this->log_thread_id)
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{
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snprintf(buffer, MAX_LOG, "[%c%c] [%s] @%u %s", log_type, log_details, this->name, (int)pthread_self(), string);
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}
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else
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{
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snprintf(buffer, MAX_LOG, "[%c%c] [%s] %s", log_type, log_details, this->name, string);
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}
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}
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/**
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* Implementation of logger_t.log.
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*
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* Yes, logg is wrong written :-).
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*/
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static void logg(private_logger_t *this, logger_level_t loglevel, char *format, ...)
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{
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if ((this->level & loglevel) == loglevel)
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{
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char buffer[MAX_LOG];
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va_list args;
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if (this->output == NULL)
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{
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/* syslog */
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this->prepend_prefix(this, loglevel, format, buffer);
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va_start(args, format);
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vsyslog(LOG_INFO, buffer, args);
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va_end(args);
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}
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else
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{
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/* File output */
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this->prepend_prefix(this, loglevel, format, buffer);
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va_start(args, format);
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vfprintf(this->output, buffer, args);
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va_end(args);
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fprintf(this->output, "\n");
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}
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}
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}
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/**
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* Implementation of logger_t.log_bytes.
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*/
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static void log_bytes(private_logger_t *this, logger_level_t loglevel, char *label, char *bytes, size_t len)
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{
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static pthread_mutex_t mutex = PTHREAD_MUTEX_INITIALIZER;
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if ((this->level & loglevel) == loglevel)
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{
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char buffer[MAX_LOG];
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char *format;
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char *buffer_pos;
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char *bytes_pos, *bytes_roof;
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int i;
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int line_start = 0;
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/* since me can't do multi-line output to syslog,
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* we must do multiple syslogs. To avoid
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* problems in output order, lock this by a mutex.
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*/
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pthread_mutex_lock(&mutex);
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format = "%s (%d bytes)";
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this->prepend_prefix(this, loglevel, format, buffer);
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if (this->output == NULL)
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{
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syslog(LOG_INFO, buffer, label, len);
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}
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else
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{
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fprintf(this->output, buffer, label, len);
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fprintf(this->output, "\n");
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}
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bytes_pos = bytes;
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bytes_roof = bytes + len;
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buffer_pos = buffer;
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for (i = 1; bytes_pos < bytes_roof; i++)
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{
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static char hexdig[] = "0123456789ABCDEF";
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*buffer_pos++ = hexdig[(*bytes_pos >> 4) & 0xF];
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*buffer_pos++ = hexdig[ *bytes_pos & 0xF];
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if ((i % 16) == 0)
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{
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*buffer_pos++ = '\0';
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buffer_pos = buffer;
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if (this->output == NULL)
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{
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syslog(LOG_INFO, "[=>] [%5d ] %s", line_start, buffer);
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}
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else
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{
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fprintf(this->output, "[=>] [%5d ] %s\n", line_start, buffer);
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}
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line_start += 16;
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}
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else if ((i % 8) == 0)
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{
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*buffer_pos++ = ' ';
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*buffer_pos++ = ' ';
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*buffer_pos++ = ' ';
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}
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else if ((i % 4) == 0)
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{
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*buffer_pos++ = ' ';
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*buffer_pos++ = ' ';
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}
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else
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{
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*buffer_pos++ = ' ';
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}
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bytes_pos++;
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}
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*buffer_pos++ = '\0';
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if (buffer_pos > buffer + 1)
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{
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buffer_pos = buffer;
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if (this->output == NULL)
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{
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syslog(LOG_INFO, "[=>] [%5d ] %s", line_start, buffer);
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}
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else
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{
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fprintf(this->output, "[=>] [%5d ] %s\n", line_start, buffer);
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}
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}
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pthread_mutex_unlock(&mutex);
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}
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}
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/**
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* Implementation of logger_t.log_chunk.
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*/
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static void log_chunk(logger_t *this, logger_level_t loglevel, char *label, chunk_t chunk)
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{
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this->log_bytes(this, loglevel, label, chunk.ptr, chunk.len);
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}
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/**
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* Implementation of logger_t.enable_level.
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*/
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static void enable_level(private_logger_t *this, logger_level_t log_level)
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{
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this->level |= log_level;
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}
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/**
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* Implementation of logger_t.disable_level.
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*/
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static void disable_level(private_logger_t *this, logger_level_t log_level)
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{
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this->level &= ~log_level;
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}
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/**
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* Implementation of logger_t.destroy.
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*/
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static void destroy(private_logger_t *this)
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{
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allocator_free(this->name);
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allocator_free(this);
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}
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/*
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* Described in header.
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*/
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logger_t *logger_create(char *logger_name, logger_level_t log_level, bool log_thread_id, FILE * output)
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{
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private_logger_t *this = allocator_alloc_thing(private_logger_t);
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/* public functions */
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this->public.log = (void(*)(logger_t*,logger_level_t,char*,...))logg;
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this->public.log_bytes = (void(*)(logger_t*, logger_level_t, char*,char*,size_t))log_bytes;
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this->public.log_chunk = log_chunk;
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this->public.enable_level = (void(*)(logger_t*,logger_level_t))enable_level;
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this->public.disable_level = (void(*)(logger_t*,logger_level_t))disable_level;
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this->public.destroy = (void(*)(logger_t*))destroy;
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/* private functions */
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this->prepend_prefix = prepend_prefix;
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if (logger_name == NULL)
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{
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logger_name = "";
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}
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/* private variables */
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this->level = log_level;
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this->log_thread_id = log_thread_id;
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this->name = allocator_alloc(strlen(logger_name) + 1);
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strcpy(this->name,logger_name);
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this->output = output;
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if (output == NULL)
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{
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openlog(DAEMON_NAME, 0, LOG_DAEMON);
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}
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return (logger_t*)this;
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}
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