/*
* bbftpd/bbftpd_daemon.c
* Copyright (C) 1999, 2000, 2001, 2002 IN2P3, CNRS
* bbftp@in2p3.fr
* http://doc.in2p3.fr/bbftp
*
* 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 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
/****************************************************************************
bbftpd_daemon.c v 0.0.0 1999/11/24
v 1.3.0 2000/03/16
v 1.6.1 2000/03/30 - Use sysconf instead of OPEN_MAX
v 1.8.4 2000/04/21 - Seed the randoma generator
v 1.8.7 2000/05/24 - Include version.h
v 1.8.10 2000/08/11 - Portage to Linux
v 1.9.3 2000/10/12 - Define the socket first to be able
to give information to the user
v 1.9.4 2000/10/16 - Supress %m
v 2.0.0 2000/12/13 - Supress be_daemon and controlsock
as global parameters
- Add parameters incontrolsock and
outcontrolsock for bbftp v2
v 2.0.1 2001/04/23 - Correct indentation
v 2.0.2 2001/05/04 - Correct include for RFIO
v 2.1.0 2001/06/11 - Change file name
*****************************************************************************/
#include <netdb.h>
#include <netinet/in.h>
#include <sys/types.h>
#include <netinet/tcp.h>
#include <stdio.h>
#include <syslog.h>
#include <sys/socket.h>
#include <sys/time.h>
#include <unistd.h>
#include <utime.h>
#include <common.h>
#include <daemon.h>
#include <daemon_proto.h>
#include <version.h>
#include <openssl/err.h>
#include <openssl/rand.h>
/*
** Common variables for BBFTP protocole version 1 and 2
*/
extern int newcontrolport ;
extern char daemonchar[50] ;
/*
** Variables for BBFTP protocole version 1
*/
extern int msgsock ;
/*
** Variables for BBFTP protocole version 2
*/
extern int incontrolsock ;
extern int outcontrolsock ;
void do_daemon(int argc,char **argv,char **envp)
{
int prpg ;
int i ;
int retcode ;
int controlsock ;
struct sockaddr_in server;
int on = 1;
int nfds ;
int pid;
char buffrand[NBITSINKEY] ;
struct timeval tp ;
unsigned int seed ;
controlsock = socket ( AF_INET, SOCK_STREAM, IPPROTO_TCP ) ;
if ( controlsock < 0 ) {
syslog(BBFTPD_ERR, "Cannot create socket to listen on: %s",strerror(errno));
fprintf(stderr,"Cannot create socket to listen on: %s\n",strerror(errno)) ;
exit(1) ;
}
if ( setsockopt(controlsock,SOL_SOCKET, SO_REUSEADDR,(char *)&on,sizeof(on)) < 0 ) {
syslog(BBFTPD_ERR,"Cannot set SO_REUSEADDR on control socket : %s",strerror(errno)) ;
fprintf(stderr,"Cannot set SO_REUSEADDR on control socket : %s\n ",strerror(errno)) ;
exit(1) ;
}
server.sin_family = AF_INET ;
server.sin_addr.s_addr = INADDR_ANY ;
server.sin_port = htons(newcontrolport);
if ( bind (controlsock,(struct sockaddr *) &server, sizeof(server) ) < 0 ) {
syslog(BBFTPD_ERR,"Error binding control socket : %s",strerror(errno)) ;
fprintf(stderr,"Error binding control socket : %s\n ",strerror(errno)) ;
exit(1) ;
}
if ( listen(controlsock,100) < 0 ) {
syslog(BBFTPD_ERR,"Error listening control socket : %s",strerror(errno)) ;
fprintf(stderr,"Error listening control socket : %s\n ",strerror(errno)) ;
exit(1) ;
}
/* Fork - so I'm not the owner of the process group any more */
retcode = fork();
if (retcode < 0) {
syslog(BBFTPD_ERR, "Cannot fork %s",strerror(errno));
exit(1);
}
/* No need for the parent any more */
if (retcode > 0) _exit(0);
prpg = 0 ;
prpg = setsid () ; /* disassoiciate from control terminal */
if ( prpg < 0 ) {
syslog(BBFTPD_ERR,"Cannot daemonise: %s",strerror(errno)) ;
exit(1) ;
}
/* Close off all file descriptors and reopen syslog */
nfds = sysconf(_SC_OPEN_MAX) ;
closelog();
for (i = 0; i <= nfds; i++) {
if ( i != controlsock) close(i);
}
openlog(daemonchar, LOG_PID | LOG_NDELAY, LOG_DAEMON);
/* log PID in /var/run/bbftpd.pid */
{
FILE *f;
if ((f = fopen("/var/run/bbftpd.pid", "w")) != NULL) {
fprintf(f, "%d", getpid());
fclose(f);
}
}
/* junk stderr */
(void) freopen("/dev/null", "w", stderr);
syslog(BBFTPD_DEBUG,"Starting bbftpd in background mode") ;
if ( bbftpd_blockallsignals() < 0 ) {
exit(1) ;
}
/*
** Load the error message from the crypto lib
*/
ERR_load_crypto_strings() ;
/*
** Initialize the buffrand buffer which is giong to be used to initialize the
** random generator
*/
/*
** Take the usec to initialize the random session
*/
gettimeofday(&tp,NULL) ;
seed = tp.tv_usec ;
srandom(seed) ;
for (i=0; i < sizeof(buffrand) ; i++) {
buffrand[i] = random() ;
}
/*
** Initialize the random generator
*/
RAND_seed(buffrand,NBITSINKEY) ;
while (1) {
msgsock = accept(controlsock, 0, 0);
if (msgsock < 0) {
syslog(BBFTPD_ERR, "Accept failed: %s",strerror(errno));
sleep(1);
continue;
}
/* Fork off a handler */
pid = fork();
if (pid < 0) {
syslog(BBFTPD_ERR, "failed to fork: %s",strerror(errno));
sleep(1);
continue;
}
if (pid == 0) {
/* I am that forked off child */
closelog();
/* Make sure that stdin/stdout are the new socket */
/* Only parent needs controlsock */
if (controlsock != 0 && controlsock != 1)
close(controlsock);
openlog(daemonchar, LOG_PID | LOG_NDELAY, LOG_DAEMON);
incontrolsock = msgsock ;
outcontrolsock = msgsock ;
return;
}
/* I am the parent */
close(msgsock);
}
}
syntax highlighted by Code2HTML, v. 0.9.1