/*    File: ftpproxy/daemon.c     Copyright (C) 2002,2003  Andreas Schoenberg  <asg@ftpproxy.org>       This software 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.      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.      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., 675 Mass Ave, Cambridge, MA 02139, USA. */#include <stdlib.h>#include <stdio.h>#include <string.h>#include <unistd.h>#include <stdarg.h>#include <ctype.h>#include <errno.h>#include <signal.h>#include <sys/wait.h>#include <pwd.h>#include <sys/types.h>#include <sys/stat.h>#include <sys/fcntl.h>#include <sys/socket.h>#include <netdb.h>#include <netinet/in.h>#include <arpa/inet.h>#include <syslog.h>#include <sys/time.h>#include "ftp.h"#include "ip-lib.h"#include "lib.h"int acceptloop(int sock){	int	connect, pid, len;	struct sockaddr_in client;	/*	 * Go into background.	 */		if (debug != 0)		; /* Do not fork in debug mode */	else if ((pid = fork()) > 0)		exit (0);	fprintf (stderr, "\nstarting ftp.proxy %s in daemon mode ...\n", VERSION);	while (1) {		/*		 * hier kommt ein accept an		 */		len = sizeof(client);		if ((connect = accept(sock, (struct sockaddr *) &client, &len)) < 0) {			if (errno == EINTR  ||  errno == ECONNABORTED)				continue;			fprintf (stderr, "%04X: accept error: %s\n", getpid(), strerror(errno));			continue;			}		if ((pid = fork()) < 0) {			fprintf (stderr, "%04X: can't fork process: %s\n", getpid(), strerror(errno));			exit (1);			}		else if (pid == 0) {			int optlen;			struct linger linger;			linger.l_onoff = 1;			linger.l_linger = 2;			optlen = sizeof(linger);			if (setsockopt(connect, SOL_SOCKET, SO_LINGER, &linger, optlen) != 0)				fprintf (stderr, "%04X: can't set linger\n", getpid());			dup2(connect, 0);			dup2(connect, 1);			close (connect);			close (sock);			return (0);			}		/*		 * Der folgende Teil wird nur im parent Prozess ausgefuehrt.		 */		close(connect);		}	close (1);	fprintf (stderr, "%04X: terminating\n", getpid());	exit (0);}