/*
 * (POP3Lite) FileLog - 3lite POP3 Daemon (logging to a file)
 * Copyright (C) 2000, 2001 Gergely Nagy <8@free.bsd.hu>
 *
 * This file is part of POP3Lite.
 *
 * POP3Lite 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.
 *
 * POP3Lite 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.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 */

#ifdef HAVE_CONFIG_H
#	include <config.h>
#endif

#include <sys/param.h>

#include <pop3lite.h>
#include <glib.h>

#include <fcntl.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <syslog.h>
#include <time.h>
#include <unistd.h>

#ifndef MAXHOSTNAMELEN
#	define MAXHOSTNAMELEN 64
#endif

static const char rcsid[]="$Id: filelog.c,v 1.7.2.1 2001/04/18 10:15:33 algernon Exp $";

int filelog_LTX_module_init ( P3LControl *control );
int filelog_LTX_module_done ( P3LControl *control );

static void filelog_sys_openlog ( P3LControl *control );
static void filelog_sys_closelog ( P3LControl *control );
static void filelog_sys_log ( P3LControl *control, int priority,
			      const char *format, ... );

static P3LSysCon_openlog B_filelog_sys_openlog;
static P3LSysCon_closelog B_filelog_sys_closelog;
static P3LSysCon_log B_filelog_sys_log;

/**
 * filelog_sys_openlog: opens the logfile
 * @control: the usual control struct
 *
 * Opens a file for logging.
 *
 * Returns: nothing.
 **/

static void
filelog_sys_openlog ( P3LControl *control )
{
	int logfd;

	if ( ( logfd = open ( (char *)
			P3L_GET_FIRST_OPTION ( "FILELOG.LOGFILE" ), 
			O_WRONLY | O_CREAT | O_APPEND,
			S_IRUSR | S_IWUSR ) ) < 0 )
		return;

	g_hash_table_insert ( control->data, "FILELOG.LOGFILEFD",
				(gpointer) logfd );
}

/**
 * filelog_sys_closelog:
 * @control: the usual control struct
 *
 * Closes a logfile
 *
 * Returns: nothing.
 **/

static void
filelog_sys_closelog ( P3LControl *control )
{
	int logfd = -1;

	logfd = (int) g_hash_table_lookup ( control->data, "FILELOG.LOGFILEFD" );

	if ( logfd > 0 )
		close ( logfd );
}

/**
 * filelog_sys_log: send a message to the logfile
 * @control: the usual control struct
 * @priority: log priority
 * @format: printf-style format string
 *
 * Sends a message to the logfile
 *
 * Returns: nothing.
 **/

static void
filelog_sys_log ( P3LControl *control, int priority,
		  const char *format, ... )
{
	char *tmp, *tmp2;
	va_list lst;
	time_t logtime;
	int logfd;
	pid_t pid = getpid ();
	char hostname[MAXHOSTNAMELEN];
#ifdef WITH_LOGLEVEL_CHECK
	char *loglevel;

	loglevel = P3L_GET_FIRST_OPTION ( "MINIMUM_LOG_LEVEL" );

	if ( priority > LOG_DEBUG - atoi ( ( loglevel != NULL ) ? loglevel : "5" ) )
		return;
#endif

	va_start ( lst, format );
	tmp = g_strdup_vprintf ( format, lst );
	va_end ( lst );

	logfd = (int) g_hash_table_lookup ( control->data, "FILELOG.LOGFILEFD" );

	if ( logfd <= 0 )
		return;

#if defined(HAVE_GETHOSTNAME)
	gethostname ( hostname, sizeof ( hostname ) );
#else
	strcpy ( (char *) hostname, "unknown" );
#endif

	logtime = time ( NULL );
	tmp2 = ctime ( &logtime );
	tmp2[strlen(tmp2)-1]=0;
	tmp2 = g_strdup_printf ("%s %s pop3lite[%u]: %s\n", tmp2, hostname, (unsigned int) pid, tmp );

	p3l_lock_fd ( logfd, P3L_GET_FIRST_OPTION ( "FILELOG.LOGFILE" ) );

	lseek ( logfd, 0, SEEK_END );
	write ( logfd, tmp2, strlen ( tmp2 ) );

	p3l_unlock_fd ( logfd, P3L_GET_FIRST_OPTION ( "FILELOG.LOGFILE" ) );

	g_free ( tmp2 );
	g_free ( tmp );
}

int
filelog_LTX_module_init ( P3LControl *control )
{
	control->system->closelog ( control );

	B_filelog_sys_openlog = control->system->openlog;
	control->system->openlog = filelog_sys_openlog;
	B_filelog_sys_closelog = control->system->closelog;
	control->system->closelog = filelog_sys_closelog;
	B_filelog_sys_log = control->system->log;
	control->system->log = filelog_sys_log;

	control->system->openlog ( control );

	return 0;
}

int
filelog_LTX_module_done ( P3LControl *control )
{
	control->system->closelog ( control );

	control->system->openlog = B_filelog_sys_openlog;
	control->system->closelog = B_filelog_sys_closelog;
	control->system->log = B_filelog_sys_log;

	control->system->openlog ( control );

	return 0;
}