2 tincd.c -- the main file for tincd
3 Copyright (C) 1998,1999,2000 Ivo Timmermans <zarq@iname.com>
5 This program is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published by
7 the Free Software Foundation; either version 2 of the License, or
8 (at your option) any later version.
10 This program is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 GNU General Public License for more details.
15 You should have received a copy of the GNU General Public License
16 along with this program; if not, write to the Free Software
17 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
22 * Revision 1.8 2000/05/14 12:22:42 guus
25 * Revision 1.7 2000/04/27 13:47:51 zarq
26 * Default config file name is tinc.conf, and pidfile is tinc.pid.
28 * Revision 1.6 2000/04/18 16:04:10 zarq
29 * Address for bugreports changed to tinc@nl.linux.org.
31 * Revision 1.5 2000/04/17 16:23:29 zarq
32 * Pass the requested size from xmalloc() and xrealloc() on to xalloc_fail_func()
34 * Revision 1.4 2000/04/06 18:28:29 zarq
35 * New option -D, don't detach.
46 #include <sys/types.h>
50 #ifdef HAVE_SYS_IOCTL_H
51 # include <sys/ioctl.h>
63 /* The name this program was run with. */
66 /* If nonzero, display usage information and exit. */
69 /* If nonzero, print the version on standard output and exit. */
70 static int show_version;
72 /* If nonzero, it will attempt to kill a running tincd and exit. */
73 static int kill_tincd = 0;
75 /* If zero, don't detach from the terminal. */
76 static int do_detach = 1;
78 char *confbase = NULL; /* directory in which all config files are */
79 char *configfilename = NULL; /* configuration file name */
80 char *identname; /* program name for syslog */
81 char *netname = NULL; /* name of the vpn network */
82 char *pidfilename; /* pid file location */
83 static pid_t ppid; /* pid of non-detached part */
84 char **g_argv; /* a copy of the cmdline arguments */
86 void cleanup_and_exit(int);
89 void make_names(void);
90 RETSIGTYPE parent_exit(int a);
91 void setup_signals(void);
92 int write_pidfile(void);
94 static struct option const long_options[] =
96 { "kill", no_argument, NULL, 'k' },
97 { "net", required_argument, NULL, 'n' },
98 { "timeout", required_argument, NULL, 'p' },
99 { "help", no_argument, &show_help, 1 },
100 { "version", no_argument, &show_version, 1 },
101 { "no-detach", no_argument, &do_detach, 0 },
109 fprintf(stderr, "Try `%s --help\' for more information.\n", program_name);
112 printf("Usage: %s [option]...\n\n", program_name);
113 printf(" -c, --config=FILE Read configuration options from FILE.\n"
114 " -D, --no-detach Don't fork and detach.\n"
115 " -d Increase debug level.\n"
116 " -k, --kill Attempt to kill a running tincd and exit.\n"
117 " -n, --net=NETNAME Connect to net NETNAME.\n"
118 " -t, --timeout=TIMEOUT Seconds to wait before giving a timeout.\n");
119 printf(" --help Display this help and exit.\n"
120 " --version Output version information and exit.\n\n");
121 printf("Report bugs to tinc@nl.linux.org.\n");
127 parse_options(int argc, char **argv, char **envp)
130 int option_index = 0;
133 while((r = getopt_long(argc, argv, "c:Ddkn:t:", long_options, &option_index)) != EOF)
137 case 0: /* long option */
139 case 'c': /* config file */
140 configfilename = xmalloc(strlen(optarg)+1);
141 strcpy(configfilename, optarg);
143 case 'D': /* no detach */
146 case 'd': /* inc debug level */
149 case 'k': /* kill old tincds */
152 case 'n': /* net name given */
153 netname = xmalloc(strlen(optarg)+1);
154 strcpy(netname, optarg);
156 case 't': /* timeout */
157 if(!(p = add_config_val(&config, TYPE_INT, optarg)))
159 printf("Invalid timeout value `%s'.\n", optarg);
171 void memory_full(int size)
173 syslog(LOG_ERR, "Memory exhausted (last is %s:%d) (couldn't allocate %d bytes); exiting.", cp_file, cp_line, size);
178 Detach from current terminal, write pidfile, kill parent
189 if((pid = fork()) < 0)
194 if(pid) /* parent process */
196 signal(SIGTERM, parent_exit);
197 sleep(600); /* wait 10 minutes */
207 if((fd = open("/dev/tty", O_RDWR)) >= 0)
209 if(ioctl(fd, TIOCNOTTY, NULL))
223 chdir("/"); /* avoid keeping a mointpoint busy */
225 openlog(identname, LOG_CONS | LOG_PID, LOG_DAEMON);
228 syslog(LOG_NOTICE, "tincd %s (%s %s) starting, debug level %d.",
229 VERSION, __DATE__, __TIME__, debug_lvl);
231 syslog(LOG_NOTICE, "tincd %s starting, debug level %d.", VERSION, debug_lvl);
233 xalloc_fail_func = memory_full;
239 Close network connections, and terminate neatly
241 void cleanup_and_exit(int c)
243 close_network_connections();
246 syslog(LOG_INFO, "Total bytes written: tap %d, socket %d; bytes read: tap %d, socket %d.",
247 total_tap_out, total_socket_out, total_tap_in, total_socket_in);
255 check for an existing tinc for this net, and write pid to pidfile
257 int write_pidfile(void)
261 if((pid = check_pid(pidfilename)))
264 fprintf(stderr, "A tincd is already running for net `%s' with pid %d.\n",
267 fprintf(stderr, "A tincd is already running with pid %d.\n", pid);
271 /* if it's locked, write-protected, or whatever */
272 if(!write_pid(pidfilename))
279 kill older tincd for this net
285 if(!(pid = read_pid(pidfilename)))
288 fprintf(stderr, "No other tincd is running for net `%s'.\n", netname);
290 fprintf(stderr, "No other tincd is running.\n");
294 errno = 0; /* No error, sometimes errno is only changed on error */
295 /* ESRCH is returned when no process with that pid is found */
296 if(kill(pid, SIGTERM) && errno == ESRCH)
297 fprintf(stderr, "Removing stale lock file.\n");
298 remove_pid(pidfilename);
304 Set all files and paths according to netname
306 void make_names(void)
312 configfilename = xmalloc(strlen(netname)+18+strlen(CONFDIR));
313 sprintf(configfilename, "%s/tinc/%s/tinc.conf", CONFDIR, netname);
317 configfilename = xmalloc(17+strlen(CONFDIR));
318 sprintf(configfilename, "%s/tinc/tinc.conf", CONFDIR);
324 pidfilename = xmalloc(strlen(netname)+20);
325 sprintf(pidfilename, "/var/run/tinc.%s.pid", netname);
326 confbase = xmalloc(strlen(netname)+8+strlen(CONFDIR));
327 sprintf(confbase, "%s/tinc/%s/", CONFDIR, netname);
328 identname = xmalloc(strlen(netname)+7);
329 sprintf(identname, "tinc.%s", netname);
333 pidfilename = "/var/run/tinc.pid";
334 confbase = xmalloc(7+strlen(CONFDIR));
335 sprintf(confbase, "%s/tinc/", CONFDIR);
341 main(int argc, char **argv, char **envp)
343 program_name = argv[0];
345 parse_options(argc, argv, envp);
349 printf("%s version %s\nCopyright (C) 1998,1999,2000 Ivo Timmermans and others,\n"
350 "see the AUTHORS file for a complete list.\n\n"
351 "tinc comes with ABSOLUTELY NO WARRANTY. This is free software,\n"
352 "and you are welcome to redistribute it under certain conditions;\n"
353 "see the file COPYING for details.\n\n", PACKAGE, VERSION);
354 printf("This product includes software developed by Eric Young (eay@mincom.oz.au)\n");
364 fprintf(stderr, "You must be root to run this program. sorry.\n");
375 if(read_config_file(configfilename))
386 if(setup_network_connections())
396 sigterm_handler(int a)
399 syslog(LOG_NOTICE, "Got TERM signal");
404 sigquit_handler(int a)
407 syslog(LOG_NOTICE, "Got QUIT signal");
412 sigsegv_square(int a)
414 syslog(LOG_NOTICE, "Got another SEGV signal: not restarting");
419 sigsegv_handler(int a)
422 syslog(LOG_NOTICE, "Got SEGV signal after %s line %d. Trying to re-execute.",
425 syslog(LOG_NOTICE, "Got SEGV signal; trying to re-execute.");
427 signal(SIGSEGV, sigsegv_square);
429 close_network_connections();
430 remove_pid(pidfilename);
431 execvp(g_argv[0], g_argv);
435 sighup_handler(int a)
438 syslog(LOG_NOTICE, "Got HUP signal");
439 close_network_connections();
440 setup_network_connections();
441 /* FIXME: read config-file and re-establish network connections */
445 sigint_handler(int a)
448 syslog(LOG_NOTICE, "Got INT signal");
453 sigusr1_handler(int a)
459 sigusr2_handler(int a)
462 syslog(LOG_NOTICE, "Forcing new keys");
470 syslog(LOG_NOTICE, "Got unexpected signal (%d) after %s line %d.",
471 a, cp_file, cp_line);
473 syslog(LOG_NOTICE, "Got unexpected signal (%d).", a);
484 if(signal(SIGTERM, SIG_IGN) != SIG_ERR)
485 signal(SIGTERM, sigterm_handler);
486 if(signal(SIGQUIT, SIG_IGN) != SIG_ERR)
487 signal(SIGQUIT, sigquit_handler);
488 if(signal(SIGSEGV, SIG_IGN) != SIG_ERR)
489 signal(SIGSEGV, sigsegv_handler);
490 if(signal(SIGHUP, SIG_IGN) != SIG_ERR)
491 signal(SIGHUP, sighup_handler);
492 signal(SIGPIPE, SIG_IGN);
493 if(signal(SIGINT, SIG_IGN) != SIG_ERR)
494 signal(SIGINT, sigint_handler);
495 signal(SIGUSR1, sigusr1_handler);
496 signal(SIGUSR2, sigusr2_handler);
497 signal(SIGCHLD, parent_exit);
500 RETSIGTYPE parent_exit(int a)