2 tincd.c -- the main file for tincd
3 Copyright (C) 1998,1999,2000 Ivo Timmermans <itimmermans@bigfoot.com>
4 2000 Guus Sliepen <guus@sliepen.warande.net>
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2 of the License, or
9 (at your option) any later version.
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with this program; if not, write to the Free Software
18 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
20 $Id: tincd.c,v 1.10.4.26 2000/11/08 00:20:06 guus Exp $
30 #include <sys/types.h>
34 #include <openssl/rand.h>
35 #include <openssl/rsa.h>
36 #include <openssl/err.h>
40 #ifdef HAVE_SYS_IOCTL_H
41 # include <sys/ioctl.h>
56 /* The name this program was run with. */
59 /* If nonzero, display usage information and exit. */
62 /* If nonzero, print the version on standard output and exit. */
63 static int show_version;
65 /* If nonzero, it will attempt to kill a running tincd and exit. */
66 static int kill_tincd = 0;
68 /* If zero, don't detach from the terminal. */
69 static int do_detach = 1;
71 /* If nonzero, generate public/private keypair for this host/net. */
72 static int generate_keys = 0;
74 char *identname; /* program name for syslog */
75 char *pidfilename; /* pid file location */
76 static pid_t ppid; /* pid of non-detached part */
77 char **g_argv; /* a copy of the cmdline arguments */
78 char **environment; /* A pointer to the environment on
81 void cleanup_and_exit(int);
84 void make_names(void);
85 RETSIGTYPE parent_exit(int a);
86 void setup_signals(void);
87 int write_pidfile(void);
89 static struct option const long_options[] =
91 { "config", required_argument, NULL, 'c' },
92 { "kill", no_argument, NULL, 'k' },
93 { "net", required_argument, NULL, 'n' },
94 { "help", no_argument, &show_help, 1 },
95 { "version", no_argument, &show_version, 1 },
96 { "no-detach", no_argument, &do_detach, 0 },
97 { "generate-keys", optional_argument, NULL, 'K'},
105 fprintf(stderr, _("Try `%s --help\' for more information.\n"), program_name);
108 printf(_("Usage: %s [option]...\n\n"), program_name);
109 printf(_(" -c, --config=DIR Read configuration options from DIR.\n"
110 " -D, --no-detach Don't fork and detach.\n"
111 " -d Increase debug level.\n"
112 " -k, --kill Attempt to kill a running tincd and exit.\n"
113 " -n, --net=NETNAME Connect to net NETNAME.\n"));
114 printf(_(" -K, --generate-keys[=BITS] Generate public/private RSA keypair.\n"
115 " --help Display this help and exit.\n"
116 " --version Output version information and exit.\n\n"));
117 printf(_("Report bugs to tinc@nl.linux.org.\n"));
123 parse_options(int argc, char **argv, char **envp)
126 int option_index = 0;
128 while((r = getopt_long(argc, argv, "c:Ddkn:K::", long_options, &option_index)) != EOF)
132 case 0: /* long option */
134 case 'c': /* config file */
135 confbase = xmalloc(strlen(optarg)+1);
136 strcpy(confbase, optarg);
138 case 'D': /* no detach */
141 case 'd': /* inc debug level */
144 case 'k': /* kill old tincds */
147 case 'n': /* net name given */
148 netname = xmalloc(strlen(optarg)+1);
149 strcpy(netname, optarg);
151 case 'K': /* generate public/private keypair */
154 generate_keys = atoi(optarg);
155 if(generate_keys < 512)
157 fprintf(stderr, _("Invalid argument! BITS must be a number equal to or greater than 512.\n"));
160 generate_keys &= ~7; /* Round it to bytes */
163 generate_keys = 1024;
173 /* This function prettyprints the key generation process */
175 void indicator(int a, int b, void *p)
180 fprintf(stderr, ".");
183 fprintf(stderr, "+");
186 fprintf(stderr, "-");
192 fprintf(stderr, " p\n");
195 fprintf(stderr, " q\n");
198 fprintf(stderr, "?");
202 fprintf(stderr, "?");
206 /* Generate a public/private RSA keypair, and possibly store it into the configuration file. */
212 fprintf(stderr, _("Generating %d bits keys:\n"), bits);
213 rsa_key = RSA_generate_key(bits, 0xFFFF, indicator, NULL);
216 fprintf(stderr, _("Error during key generation!"));
220 fprintf(stderr, _("Done.\n"));
222 fprintf(stderr, _("Please copy the private key to tinc.conf and the\npublic key to your host configuration file:\n\n"));
223 printf("PublicKey = %s\n", BN_bn2hex(rsa_key->n));
224 printf("PrivateKey = %s\n", BN_bn2hex(rsa_key->d));
230 void memory_full(int size)
232 syslog(LOG_ERR, _("Memory exhausted (last is %s:%d) (couldn't allocate %d bytes), exiting."), cp_file, cp_line, size);
237 Detach from current terminal, write pidfile, kill parent
248 if((pid = fork()) < 0)
253 if(pid) /* parent process */
255 signal(SIGTERM, parent_exit);
256 sleep(600); /* wait 10 minutes */
266 if((fd = open("/dev/tty", O_RDWR)) >= 0)
268 if(ioctl(fd, TIOCNOTTY, NULL))
282 chdir("/"); /* avoid keeping a mointpoint busy */
284 openlog(identname, LOG_CONS | LOG_PID, LOG_DAEMON);
286 if(debug_lvl > DEBUG_NOTHING)
287 syslog(LOG_NOTICE, _("tincd %s (%s %s) starting, debug level %d"),
288 VERSION, __DATE__, __TIME__, debug_lvl);
290 syslog(LOG_NOTICE, _("tincd %s starting"), VERSION);
292 xalloc_fail_func = memory_full;
298 Close network connections, and terminate neatly
300 void cleanup_and_exit(int c)
302 close_network_connections();
304 if(debug_lvl > DEBUG_NOTHING)
305 syslog(LOG_INFO, _("Total bytes written: tap %d, socket %d; bytes read: tap %d, socket %d"),
306 total_tap_out, total_socket_out, total_tap_in, total_socket_in);
314 check for an existing tinc for this net, and write pid to pidfile
316 int write_pidfile(void)
320 if((pid = check_pid(pidfilename)))
323 fprintf(stderr, _("A tincd is already running for net `%s' with pid %d.\n"),
326 fprintf(stderr, _("A tincd is already running with pid %d.\n"), pid);
330 /* if it's locked, write-protected, or whatever */
331 if(!write_pid(pidfilename))
338 kill older tincd for this net
344 if(!(pid = read_pid(pidfilename)))
347 fprintf(stderr, _("No other tincd is running for net `%s'.\n"), netname);
349 fprintf(stderr, _("No other tincd is running.\n"));
353 errno = 0; /* No error, sometimes errno is only changed on error */
354 /* ESRCH is returned when no process with that pid is found */
355 if(kill(pid, SIGTERM) && errno == ESRCH)
356 fprintf(stderr, _("Removing stale lock file.\n"));
357 remove_pid(pidfilename);
363 Set all files and paths according to netname
365 void make_names(void)
370 asprintf(&pidfilename, "/var/run/tinc.%s.pid", netname);
372 asprintf(&confbase, "%s/tinc/%s", CONFDIR, netname);
374 fprintf(stderr, "Both netname and configuration directory given, using the latter...\n");
376 asprintf(&identname, "tinc.%s", netname);
381 pidfilename = "/var/run/tinc.pid";
383 asprintf(&confbase, "%s/tinc", CONFDIR);
390 main(int argc, char **argv, char **envp)
392 program_name = argv[0];
394 setlocale (LC_ALL, "");
395 bindtextdomain (PACKAGE, LOCALEDIR);
396 textdomain (PACKAGE);
398 /* Do some intl stuff right now */
400 unknown = _("unknown");
403 parse_options(argc, argv, envp);
407 printf(_("%s version %s (built %s %s, protocol %d)\n"), PACKAGE, VERSION, __DATE__, __TIME__, PROT_CURRENT);
408 printf(_("Copyright (C) 1998,1999,2000 Ivo Timmermans, Guus Sliepen and others.\n"
409 "See the AUTHORS file for a complete list.\n\n"
410 "tinc comes with ABSOLUTELY NO WARRANTY. This is free software,\n"
411 "and you are welcome to redistribute it under certain conditions;\n"
412 "see the file COPYING for details.\n"));
422 fprintf(stderr, _("You must be root to run this program. Sorry.\n"));
430 /* Slllluuuuuuurrrrp! */
432 RAND_load_file("/dev/urandom", 1024);
435 exit(keygen(generate_keys));
440 if(read_server_config())
448 if(debug_lvl >= DEBUG_ERROR)
449 ERR_load_crypto_strings();
453 if(!setup_network_connections())
459 syslog(LOG_ERR, _("Unrecoverable error"));
464 syslog(LOG_NOTICE, _("Restarting in %d seconds!"), MAXTIMEOUT);
469 syslog(LOG_ERR, _("Not restarting."));
476 sigterm_handler(int a)
478 if(debug_lvl > DEBUG_NOTHING)
479 syslog(LOG_NOTICE, _("Got TERM signal"));
485 sigquit_handler(int a)
487 if(debug_lvl > DEBUG_NOTHING)
488 syslog(LOG_NOTICE, _("Got QUIT signal"));
493 sigsegv_square(int a)
495 syslog(LOG_ERR, _("Got another SEGV signal: not restarting"));
500 sigsegv_handler(int a)
502 syslog(LOG_ERR, _("Got SEGV signal"));
507 syslog(LOG_NOTICE, _("Trying to re-execute in 5 seconds..."));
508 signal(SIGSEGV, sigsegv_square);
509 close_network_connections();
511 remove_pid(pidfilename);
512 execvp(g_argv[0], g_argv);
516 syslog(LOG_NOTICE, _("Not restarting."));
522 sighup_handler(int a)
524 if(debug_lvl > DEBUG_NOTHING)
525 syslog(LOG_NOTICE, _("Got HUP signal"));
530 sigint_handler(int a)
532 if(debug_lvl > DEBUG_NOTHING)
533 syslog(LOG_NOTICE, _("Got INT signal, exiting"));
538 sigusr1_handler(int a)
544 sigusr2_handler(int a)
552 syslog(LOG_WARNING, _("Got unexpected signal %d (%s)"), a, strsignal(a));
564 if(signal(SIGTERM, SIG_IGN) != SIG_ERR)
565 signal(SIGTERM, sigterm_handler);
566 if(signal(SIGQUIT, SIG_IGN) != SIG_ERR)
567 signal(SIGQUIT, sigquit_handler);
568 if(signal(SIGSEGV, SIG_IGN) != SIG_ERR)
569 signal(SIGSEGV, sigsegv_handler);
570 if(signal(SIGHUP, SIG_IGN) != SIG_ERR)
571 signal(SIGHUP, sighup_handler);
572 signal(SIGPIPE, SIG_IGN);
573 if(signal(SIGINT, SIG_IGN) != SIG_ERR)
574 signal(SIGINT, sigint_handler);
575 signal(SIGUSR1, sigusr1_handler);
576 signal(SIGUSR2, sigusr2_handler);
577 signal(SIGCHLD, SIG_IGN);
580 RETSIGTYPE parent_exit(int a)