source: TI05-delivery/trunk/src/bbftp-server-3.2.0/bbftpd/bbftpd_daemon.c @ 773

Subversion URL: http://proj.badc.rl.ac.uk/svn/ndg/TI05-delivery/trunk/src/bbftp-server-3.2.0/bbftpd/bbftpd_daemon.c@983
Revision 773, 6.8 KB checked in by spascoe, 14 years ago (diff)

Initial import of bbftp source

Line 
1/*
2 * bbftpd/bbftpd_daemon.c
3 * Copyright (C) 1999, 2000, 2001, 2002 IN2P3, CNRS
4 * bbftp@in2p3.fr
5 * http://doc.in2p3.fr/bbftp
6 *
7 * This program is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU General Public License
9 * as published by the Free Software Foundation; either version 2
10 * of the License, or any later version.
11 *
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
15 * GNU General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
20 */ 
21
22/****************************************************************************
23
24 
25 
26 bbftpd_daemon.c    v 0.0.0  1999/11/24
27                    v 1.3.0  2000/03/16
28                    v 1.6.1  2000/03/30 - Use sysconf instead of OPEN_MAX
29                    v 1.8.4  2000/04/21 - Seed the randoma generator
30                    v 1.8.7  2000/05/24 - Include version.h
31                    v 1.8.10 2000/08/11 - Portage to Linux
32                    v 1.9.3  2000/10/12 - Define the socket first to be able
33                                          to give information to the user
34                    v 1.9.4  2000/10/16 - Supress %m
35                    v 2.0.0  2000/12/13 - Supress be_daemon and controlsock
36                                          as global parameters
37                                        - Add parameters incontrolsock and
38                                          outcontrolsock for bbftp v2
39                    v 2.0.1  2001/04/23 - Correct indentation
40                    v 2.0.2  2001/05/04 - Correct include for RFIO
41                    v 2.1.0  2001/06/11 - Change file name
42
43*****************************************************************************/
44#include <bbftpd.h>
45
46#include <netdb.h>
47#include <netinet/in.h>
48#include <netinet/tcp.h>
49#include <stdio.h>
50#include <syslog.h>
51#include <sys/socket.h>
52#if TIME_WITH_SYS_TIME
53# include <sys/time.h>
54# include <time.h>
55#else
56# if HAVE_SYS_TIME_H
57#  include <sys/time.h>
58# else
59#  include <time.h>
60# endif
61#endif
62#include <unistd.h>
63#include <utime.h>
64#if HAVE_STRING_H
65# include <string.h>
66#endif
67
68#include <common.h>
69#include <daemon.h>
70#include <daemon_proto.h>
71#include <version.h>
72#include <openssl/err.h>
73#include <openssl/rand.h>
74/*
75** Common variables for BBFTP protocole version 1 and 2
76*/
77extern int  newcontrolport ;
78extern char daemonchar[50] ;
79/*
80** Variables for BBFTP protocole version 1
81*/
82extern int msgsock ;
83/*
84** Variables for BBFTP protocole version 2
85*/
86extern int incontrolsock ;
87extern int outcontrolsock ;
88
89void do_daemon(int argc,char **argv,char **envp)
90{
91
92    int        prpg ;
93    int        i ;
94    int     retcode ;
95    int     controlsock ;
96    struct sockaddr_in server;
97    int     on = 1;
98    int     nfds ;
99    int     pid;
100   
101    char    buffrand[NBITSINKEY] ;
102    struct timeval tp ;
103    unsigned int seed ;
104   
105    controlsock = socket ( AF_INET, SOCK_STREAM, IPPROTO_TCP ) ;
106    if ( controlsock < 0 ) {
107        syslog(BBFTPD_ERR, "Cannot create socket to listen on: %s",strerror(errno));
108        fprintf(stderr,"Cannot create socket to listen on: %s\n",strerror(errno)) ;
109        exit(1) ;
110    }
111    if ( setsockopt(controlsock,SOL_SOCKET, SO_REUSEADDR,(char *)&on,sizeof(on)) < 0 ) {
112        syslog(BBFTPD_ERR,"Cannot set SO_REUSEADDR on control socket : %s",strerror(errno)) ;
113        fprintf(stderr,"Cannot set SO_REUSEADDR on control socket : %s\n ",strerror(errno)) ;
114        exit(1) ;
115    }
116    server.sin_family = AF_INET ;
117    server.sin_addr.s_addr = INADDR_ANY ;
118    server.sin_port = htons(newcontrolport);
119    if ( bind (controlsock,(struct sockaddr *) &server, sizeof(server) ) < 0 ) {
120        syslog(BBFTPD_ERR,"Error binding control socket : %s",strerror(errno)) ;
121        fprintf(stderr,"Error binding control socket : %s\n ",strerror(errno)) ;
122        exit(1) ;
123    }
124    if ( listen(controlsock,100) < 0 ) {
125        syslog(BBFTPD_ERR,"Error listening control socket : %s",strerror(errno)) ;
126        fprintf(stderr,"Error listening control socket : %s\n ",strerror(errno)) ;
127        exit(1) ;
128    }
129    /* Fork - so I'm not the owner of the process group any more */
130    retcode = fork();
131    if (retcode < 0) {
132        syslog(BBFTPD_ERR, "Cannot fork %s",strerror(errno));
133        exit(1);
134    }
135    /* No need for the parent any more */
136    if (retcode > 0) _exit(0);
137
138    prpg = 0 ;
139    prpg = setsid () ;     /* disassoiciate from control terminal */
140    if ( prpg < 0 ) {
141        syslog(BBFTPD_ERR,"Cannot daemonise: %s",strerror(errno)) ;
142        exit(1) ;
143    }
144    /* Close off all file descriptors and reopen syslog */
145
146    nfds = sysconf(_SC_OPEN_MAX) ;
147
148    closelog();
149    for (i = 0; i <= nfds; i++) {
150        if ( i != controlsock) close(i);
151    }
152    openlog(daemonchar, LOG_PID | LOG_NDELAY, BBFTPD_FACILITY);
153
154    /* log PID in /var/run/bbftpd.pid */
155    {
156        FILE *f;
157        if ((f = fopen("/var/run/bbftpd.pid", "w")) != NULL) {
158            fprintf(f, "%d", getpid());
159            fclose(f);
160        }
161    }
162
163    /* junk stderr */
164    (void) freopen("/dev/null", "w", stderr);
165   
166    syslog(BBFTPD_DEBUG,"Starting bbftpd in background mode") ;
167    if ( bbftpd_blockallsignals() < 0 ) {
168        exit(1) ;
169    }
170    /*
171    ** Load the error message from the crypto lib
172    */
173    ERR_load_crypto_strings() ;
174    /*
175    ** Initialize the buffrand buffer which is giong to be used to initialize the
176    ** random generator
177    */
178    /*
179    ** Take the usec to initialize the random session
180    */
181    gettimeofday(&tp,NULL) ;
182    seed = tp.tv_usec ;
183    srandom(seed) ;
184    for (i=0; i < sizeof(buffrand) ; i++) {
185        buffrand[i] = random() ;
186    }
187    /*
188    ** Initialize the random generator
189    */
190    RAND_seed(buffrand,NBITSINKEY) ;
191    while (1) {
192
193        msgsock = accept(controlsock, 0, 0);
194        if (msgsock < 0) {
195             syslog(BBFTPD_ERR, "Accept failed: %s",strerror(errno));
196            sleep(1);
197            continue;
198        }
199            /* Fork off a handler */
200        pid = fork();
201        if (pid < 0) {
202            syslog(BBFTPD_ERR, "failed to fork: %s",strerror(errno));
203             sleep(1);
204            continue;
205        }
206        if (pid == 0) {
207            /* I am that forked off child */
208            closelog();
209            /* Make sure that stdin/stdout are the new socket */
210            /* Only parent needs controlsock */
211            if (controlsock != 0 && controlsock != 1)
212                close(controlsock);
213                openlog(daemonchar, LOG_PID | LOG_NDELAY, BBFTPD_FACILITY);
214                incontrolsock = msgsock ;
215                outcontrolsock = msgsock ;
216                   return;
217                }
218
219            /* I am the parent */
220        close(msgsock);
221   
222    }
223}
224
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