strongswan/src/libstrongswan/utils/logger.c

380 lines
7.8 KiB
C

/**
* @file logger.c
*
* @brief Implementation of logger_t.
*
*/
/*
* 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 <syslog.h>
#include <stdarg.h>
#include <string.h>
#include <stdio.h>
#include <time.h>
#include <pthread.h>
#include "logger.h"
/**
* Maximum length of a log entry (only used for logger_s.log).
*/
#define MAX_LOG 8192
/**
* Maximum number of logged bytes per line
*/
#define MAX_BYTES 16
typedef struct private_logger_t private_logger_t;
/**
* @brief Private data of a logger_t object.
*/
struct private_logger_t {
/**
* Public data.
*/
logger_t public;
/**
* Detail-level of logger.
*/
log_level_t level;
/**
* Name of logger.
*/
char *name;
/**
* File to write log output to.
* NULL for syslog.
*/
FILE *output;
/**
* Should a thread_id be included in the log?
*/
bool log_thread_id;
};
/**
* thread local storage for get_thread_number
*/
static pthread_key_t thread_ids;
static void make_key(void)
{
pthread_key_create(&thread_ids, NULL);
}
/**
* Get a unique thread number for a calling thread. Since
* pthread_self returns large and ugly numbers, use this function
* for logging; these numbers are incremental starting at 1
*/
static int get_thread_number(void)
{
static int current_num = 0;
static pthread_once_t key_once = PTHREAD_ONCE_INIT;
int stored_num;
pthread_once(&key_once, make_key);
stored_num = (int)pthread_getspecific(thread_ids);
if (stored_num == 0)
{
pthread_setspecific(thread_ids, (void*)++current_num);
return current_num;
}
else
{
return stored_num;
}
}
/**
* prepend the logging prefix to string and store it in buffer
*/
static void prepend_prefix(private_logger_t *this, log_level_t loglevel, const char *string, char *buffer)
{
char log_type, log_details;
u_int8_t thread_id = 0;
if (loglevel & CONTROL)
{
log_type = 'C';
}
else if (loglevel & ERROR)
{
log_type = 'E';
}
else if (loglevel & RAW)
{
log_type = 'R';
}
else if (loglevel & PRIVATE)
{
log_type = 'P';
}
else if (loglevel & AUDIT)
{
log_type = 'A';
}
else
{
log_type = '-';
}
if (loglevel & (LEVEL3 - LEVEL2))
{
log_details = '3';
}
else if (loglevel & (LEVEL2 - LEVEL1))
{
log_details = '2';
}
else if (loglevel & LEVEL1)
{
log_details = '1';
}
else
{
log_details = '0';
}
if (this->log_thread_id)
{
thread_id = get_thread_number();
}
snprintf(buffer, MAX_LOG, "%02d[%c%c:%s] %s", thread_id, log_type, log_details, this->name, string);
}
/**
* Convert a charon-loglevel to a syslog priority
*/
static int get_priority(log_level_t loglevel)
{
if (loglevel & ERROR)
{
return LOG_AUTHPRIV|LOG_ERR;
}
if (loglevel & AUDIT)
{
return LOG_AUTHPRIV|LOG_INFO;
}
return LOG_AUTHPRIV|LOG_DEBUG;
}
/**
* Implementation of logger_t.log.
*
* Yes, logg is written wrong :-).
*/
static void logg(private_logger_t *this, log_level_t loglevel, const char *format, ...)
{
if ((this->level & loglevel) == loglevel)
{
char buffer[MAX_LOG];
va_list args;
if (this->output == NULL)
{
/* syslog */
prepend_prefix(this, loglevel, format, buffer);
va_start(args, format);
vsyslog(get_priority(loglevel), buffer, args);
va_end(args);
}
else
{
/* File output */
prepend_prefix(this, loglevel, format, buffer);
va_start(args, format);
vfprintf(this->output, buffer, args);
va_end(args);
fprintf(this->output, "\n");
}
}
}
/**
* Implementation of logger_t.log_bytes.
*/
static void log_bytes(private_logger_t *this, log_level_t loglevel, const char *label, const char *bytes, size_t len)
{
static pthread_mutex_t mutex = PTHREAD_MUTEX_INITIALIZER;
if ((this->level & loglevel) == loglevel)
{
u_int8_t thread_id = 0;
char buffer[MAX_LOG];
char ascii_buffer[MAX_BYTES+1];
char *buffer_pos = buffer;
const char format[] = "%s %d bytes @ %p";
const char *bytes_pos = bytes;
const char *bytes_roof = bytes + len;
int line_start = 0;
int i = 0;
/* since me can't do multi-line output to syslog,
* we must do multiple syslogs. To avoid
* problems in output order, lock this by a mutex.
*/
pthread_mutex_lock(&mutex);
prepend_prefix(this, loglevel, format, buffer);
if (this->log_thread_id)
{
thread_id = get_thread_number();
}
if (this->output == NULL)
{
syslog(get_priority(loglevel), buffer, label, len, bytes);
}
else
{
fprintf(this->output, buffer, label, len, bytes);
fprintf(this->output, "\n");
}
while (bytes_pos < bytes_roof)
{
static char hexdig[] = "0123456789ABCDEF";
*buffer_pos++ = hexdig[(*bytes_pos >> 4) & 0xF];
*buffer_pos++ = hexdig[ *bytes_pos & 0xF];
ascii_buffer[i++] = (*bytes_pos > 31 && *bytes_pos < 127)
? *bytes_pos : '.';
if (++bytes_pos == bytes_roof || i == MAX_BYTES)
{
int padding = 3 * (MAX_BYTES - i);
while (padding--)
{
*buffer_pos++ = ' ';
}
*buffer_pos++ = '\0';
ascii_buffer[i] = '\0';
if (this->output == NULL)
{
syslog(get_priority(loglevel), "%02d[ :%5d] %s %s", thread_id, line_start, buffer, ascii_buffer);
}
else
{
fprintf(this->output, "%02d[ :%5d] %s %s\n", thread_id, line_start, buffer, ascii_buffer);
}
buffer_pos = buffer;
line_start += MAX_BYTES;
i = 0;
}
else
{
*buffer_pos++ = ' ';
}
}
pthread_mutex_unlock(&mutex);
}
}
/**
* Implementation of logger_t.log_chunk.
*/
static void log_chunk(logger_t *this, log_level_t loglevel, const char *label, chunk_t chunk)
{
this->log_bytes(this, loglevel, label, chunk.ptr, chunk.len);
}
/**
* Implementation of logger_t.enable_level.
*/
static void enable_level(private_logger_t *this, log_level_t log_level)
{
this->level |= log_level;
}
/**
* Implementation of logger_t.disable_level.
*/
static void disable_level(private_logger_t *this, log_level_t log_level)
{
this->level &= ~log_level;
}
/**
* Implementation of logger_t.set_output.
*/
static void set_output(private_logger_t *this, FILE * output)
{
this->output = output;
}
/**
* Implementation of logger_t.get_level.
*/
static log_level_t get_level(private_logger_t *this)
{
return this->level;
}
/**
* Implementation of logger_t.destroy.
*/
static void destroy(private_logger_t *this)
{
free(this->name);
free(this);
}
/*
* Described in header.
*/
logger_t *logger_create(char *logger_name, log_level_t log_level, bool log_thread_id, FILE * output)
{
private_logger_t *this = malloc_thing(private_logger_t);
/* public functions */
this->public.log = (void(*)(logger_t*,log_level_t,const char*,...))logg;
this->public.log_bytes = (void(*)(logger_t*, log_level_t, const char*, const char*,size_t))log_bytes;
this->public.log_chunk = log_chunk;
this->public.enable_level = (void(*)(logger_t*,log_level_t))enable_level;
this->public.disable_level = (void(*)(logger_t*,log_level_t))disable_level;
this->public.get_level = (log_level_t(*)(logger_t*))get_level;
this->public.set_output = (void(*)(logger_t*,FILE*))set_output;
this->public.destroy = (void(*)(logger_t*))destroy;
if (logger_name == NULL)
{
logger_name = "";
}
/* private variables */
this->level = log_level;
this->log_thread_id = log_thread_id;
this->name = malloc(strlen(logger_name) + 1);
strcpy(this->name,logger_name);
this->output = output;
return (logger_t*)this;
}