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/* hey emacs! -*- Mode: C; c-file-style: "k&r"; indent-tabs-mode: nil -*- */
/*
* logger.c
* functions for logging messages.
*
* $Id: logger.c,v 1.12 2004/02/27 02:05:26 jp Exp $
*
* Copyright (c) 2000 Jean-Pierre Lefebvre <helix@step.polymtl.ca>
* and Remi Lefebvre <remi@debian.org>
*
* atftp is free software; you can redistribute them and/or modify them
* 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.
*
*/
#include "config.h"
#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <stdarg.h>
#include <string.h>
#include <time.h>
#include <unistd.h>
#include <netdb.h>
#include "logger.h"
#define MAXLEN 128
static int log_syslog_is_open = 0;
static int log_priority = 0;
static char *log_filename = NULL;
static int log_fd;
static FILE *log_fp = NULL;
static char *log_ident;
/*
* Open a file for logging. If filename is NULL, then use
* stderr for the client or the syslog for the server. Log
* only message less or equal to priority.
*/
void open_logger(char *ident, char *filename, int priority)
{
close_logger(); /* make sure we initialise variables and close
previously opened log. */
log_priority = priority;
if (ident)
log_ident = strdup(ident);
else
log_ident = "unset";
if (filename)
log_filename = strdup(filename);
else
{
openlog(log_ident, LOG_PID, LOG_DAEMON);
log_syslog_is_open = 1;
}
if (log_filename)
{
if ((log_fd = open(log_filename, O_WRONLY | O_APPEND)) < 0)
{
openlog(log_ident, LOG_PID, LOG_DAEMON);
log_syslog_is_open = 1;
logger(LOG_CRIT, "Unable to open %s for logging, "
"reverting to syslog", log_filename);
}
else
log_fp = fdopen(log_fd, "a");
}
}
/*
* Same as syslog but allow to format a string, like printf, when logging to
* file. This fonction will either call syslog or fprintf depending of the
* previous call to open_logger().
*/
void logger(int severity, const char *fmt, ...)
{
char message[MAXLEN];
char time_buf[MAXLEN];
char hostname[MAXLEN];
time_t t;
struct tm *tm;
va_list args;
va_start(args, fmt);
time(&t);
tm = localtime(&t);
strftime(time_buf, MAXLEN, "%b %d %H:%M:%S", tm);
gethostname(hostname, MAXLEN);
if (severity <= log_priority)
{
vsnprintf(message, sizeof(message), fmt, args);
if (log_fp)
{
fprintf(log_fp, "%s %s %s[%d.%d]: %s\n", time_buf, hostname,
log_ident, getpid(), pthread_self(), message);
fflush(log_fp);
}
else if (log_syslog_is_open)
syslog(severity, "%s", message);
else
fprintf(stderr, "%s %s %s[%d.%d]: %s\n", time_buf, hostname,
log_ident, getpid(), pthread_self(), message);
}
va_end(args);
}
/*
* Close the file or syslog. Initialise variables.
*/
void close_logger(void)
{
log_priority = 0;
if (log_syslog_is_open)
closelog();
log_syslog_is_open = 0;
if (log_fp)
fclose(log_fp);
log_fp = NULL;
if (log_filename)
free(log_filename);
log_filename = NULL;
if (log_ident)
free(log_ident);
}
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