strongswan/Source/charon/logger.c

/**
 * @file logger.c
 * 
 * @brief Logger object, allows fine-controlled logging
 * 
 */

/*
 * Copyright (C) 2005 Jan Hutter, Martin Willi
 * Hochschule fuer Technik Rapperswil
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the
 * Free Software Foundation; either version 2 of the License, or (at your
 * option) any later version.  See <http://www.fsf.org/copyleft/gpl.txt>.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
 * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * for more details.
 */



#include "logger.h"
#include "types.h"
#include "allocator.h"

#include <syslog.h>
#include <stdarg.h>
#include <string.h>
#include <stdio.h>

/**
 * Maximum length of al log entry (only used for logger_s.log)
 */
#define MAX_LOG 8192

/**
 * @brief The logger object
 */
typedef struct private_logger_s private_logger_t;
struct private_logger_s { 	
	/**
	 * Public data
	 */
	logger_t public;
	/**
	 * detail-level of logger
	 */
	logger_level_t level;
	/**
	 * name of logger
	 */
	char *name;
};


/**
 * implements logger_t-function log
 * @see logger_s.log
 */
static status_t logg(private_logger_t *this, logger_level_t loglevel, char *format, ...)
{
	if ((this->level & loglevel) == loglevel)
	{
		char buffer[MAX_LOG];
		snprintf(buffer, MAX_LOG, "%s: %s", this->name, format);
		va_list args;
		va_start(args, format);
		vsyslog(LOG_INFO, buffer, args);
		va_end(args);	
	}

	return SUCCESS;
}


/**
 * implements logger_t-function destroy
 * @see logger_s.log_bytes
 */
static status_t log_bytes(private_logger_t *this, logger_level_t loglevel, char *label, char *bytes, size_t len)
{
	if ((this->level & loglevel) == loglevel)
	{
		char buffer[64];
		char *buffer_pos;
		char *bytes_pos, *bytes_roof;
		int i;

		syslog(LOG_INFO, "%s: %s (%d bytes)", this->name, label, len);	
	
		bytes_pos = bytes;
		bytes_roof = bytes + len;
		buffer_pos = buffer;

		for (i = 1; bytes_pos < bytes_roof; i++)
		{
			static const char hexdig[] = "0123456789ABCDEF";
			*buffer_pos++ = hexdig[(*bytes_pos >> 4) & 0xF];
			*buffer_pos++ = hexdig[ *bytes_pos       & 0xF];
			if ((i % 16) == 0) 
			{
				*buffer_pos++ = '\0';
				buffer_pos = buffer;
				syslog(LOG_INFO, "| %s", buffer);	
			}
			else if ((i % 8) == 0)
			{
				*buffer_pos++ = ' ';
				*buffer_pos++ = ' ';
				*buffer_pos++ = ' ';
			}
			else if ((i % 4) == 0)
			{
				*buffer_pos++ = ' ';
				*buffer_pos++ = ' ';
			}
			else 
			{	
				*buffer_pos++ = ' ';
			}
			
			bytes_pos++;
		}
		
		*buffer_pos++ = '\0';
		buffer_pos = buffer;
		syslog(LOG_INFO, "| %s", buffer);	
	}

	return SUCCESS;
}


/**
 * implements logger_t-function log_chunk
 * @see logger_s.log_chunk
 */
static status_t log_chunk(logger_t *this, logger_level_t loglevel, char *label, chunk_t *chunk)
{
	this->log_bytes(this, loglevel, label, chunk->ptr, chunk->len);
	return SUCCESS;
}


/**
 * implements logger_t-function enable_level
 * @see logger_s.enable_level
 */
static status_t enable_level(private_logger_t *this, logger_level_t log_level)
{
	this->level |= log_level;
	return SUCCESS;
}

/**
 * implements logger_t-function disable_level
 * @see logger_s.disable_level
 */
static status_t disable_level(private_logger_t *this, logger_level_t log_level)
{
	this->level &= ~log_level;
	return SUCCESS;
}

/**
 * implements logger_t-function destroy
 * @see logger_s.destroy
 */
static status_t destroy(private_logger_t *this)
{
	allocator_free(this);
	return SUCCESS;
}

/*
 * Described in Header
 */	
logger_t *logger_create(char *logger_name, logger_level_t log_level)
{
	private_logger_t *this = allocator_alloc_thing(private_logger_t);
		
	if (this == NULL)
	{
		return NULL;	
	}
	
	this->public.log = (status_t(*)(logger_t*,logger_level_t,char*,...))logg;
	this->public.log_bytes = (status_t(*)(logger_t*, logger_level_t, char*,char*,size_t))log_bytes;
	this->public.log_chunk = log_chunk;
	this->public.enable_level = (status_t(*)(logger_t*,logger_level_t))enable_level;
	this->public.disable_level = (status_t(*)(logger_t*,logger_level_t))disable_level;
	this->public.destroy = (status_t(*)(logger_t*))destroy;

	this->level = log_level;
	this->name = logger_name;
	
	openlog("charon", 0, LOG_DAEMON);
	
	return (logger_t*)this;
}