Call event_init() after detaching.
[tinc] / src / tincd.c
1 /*
2     tincd.c -- the main file for tincd
3     Copyright (C) 1998-2005 Ivo Timmermans
4                   2000-2012 Guus Sliepen <guus@tinc-vpn.org>
5                   2008      Max Rijevski <maksuf@gmail.com>
6                   2009      Michael Tokarev <mjt@tls.msk.ru>
7                   2010      Julien Muchembled <jm@jmuchemb.eu>
8                   2010      Timothy Redaelli <timothy@redaelli.eu>
9
10     This program is free software; you can redistribute it and/or modify
11     it under the terms of the GNU General Public License as published by
12     the Free Software Foundation; either version 2 of the License, or
13     (at your option) any later version.
14
15     This program is distributed in the hope that it will be useful,
16     but WITHOUT ANY WARRANTY; without even the implied warranty of
17     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
18     GNU General Public License for more details.
19
20     You should have received a copy of the GNU General Public License along
21     with this program; if not, write to the Free Software Foundation, Inc.,
22     51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
23 */
24
25 #include "system.h"
26
27 /* Darwin (MacOS/X) needs the following definition... */
28 #ifndef _P1003_1B_VISIBLE
29 #define _P1003_1B_VISIBLE
30 #endif
31
32 #ifdef HAVE_SYS_MMAN_H
33 #include <sys/mman.h>
34 #endif
35
36 #include <openssl/rand.h>
37 #include <openssl/rsa.h>
38 #include <openssl/pem.h>
39 #include <openssl/evp.h>
40 #include <openssl/engine.h>
41
42 #ifdef HAVE_LZO
43 #include LZO1X_H
44 #endif
45
46 #ifndef HAVE_MINGW
47 #include <pwd.h>
48 #include <grp.h>
49 #include <time.h>
50 #endif
51
52 #include <getopt.h>
53
54 #include "conf.h"
55 #include "control.h"
56 #include "crypto.h"
57 #include "device.h"
58 #include "logger.h"
59 #include "net.h"
60 #include "netutl.h"
61 #include "process.h"
62 #include "protocol.h"
63 #include "utils.h"
64 #include "xalloc.h"
65
66 /* The name this program was run with. */
67 char *program_name = NULL;
68
69 /* If nonzero, display usage information and exit. */
70 static bool show_help = false;
71
72 /* If nonzero, print the version on standard output and exit.  */
73 static bool show_version = false;
74
75 /* If nonzero, use null ciphers and skip all key exchanges. */
76 bool bypass_security = false;
77
78 /* If nonzero, disable swapping for this process. */
79 static bool do_mlock = false;
80
81 /* If nonzero, chroot to netdir after startup. */
82 static bool do_chroot = false;
83
84 /* If !NULL, do setuid to given user after startup */
85 static const char *switchuser = NULL;
86
87 /* If nonzero, write log entries to a separate file. */
88 bool use_logfile = false;
89
90 char *identname = NULL;                         /* program name for syslog */
91 char *logfilename = NULL;                       /* log file location */
92 char *pidfilename = NULL;
93 char **g_argv;                                  /* a copy of the cmdline arguments */
94
95 static int status = 1;
96
97 static struct option const long_options[] = {
98         {"config", required_argument, NULL, 'c'},
99         {"net", required_argument, NULL, 'n'},
100         {"help", no_argument, NULL, 1},
101         {"version", no_argument, NULL, 2},
102         {"no-detach", no_argument, NULL, 'D'},
103         {"debug", optional_argument, NULL, 'd'},
104         {"bypass-security", no_argument, NULL, 3},
105         {"mlock", no_argument, NULL, 'L'},
106         {"chroot", no_argument, NULL, 'R'},
107         {"user", required_argument, NULL, 'U'},
108         {"logfile", optional_argument, NULL, 4},
109         {"pidfile", required_argument, NULL, 5},
110         {"option", required_argument, NULL, 'o'},
111         {NULL, 0, NULL, 0}
112 };
113
114 #ifdef HAVE_MINGW
115 static struct WSAData wsa_state;
116 CRITICAL_SECTION mutex;
117 int main2(int argc, char **argv);
118 #endif
119
120 static void usage(bool status) {
121         if(status)
122                 fprintf(stderr, "Try `%s --help\' for more information.\n",
123                                 program_name);
124         else {
125                 printf("Usage: %s [option]...\n\n", program_name);
126                 printf( "  -c, --config=DIR              Read configuration options from DIR.\n"
127                                 "  -D, --no-detach               Don't fork and detach.\n"
128                                 "  -d, --debug[=LEVEL]           Increase debug level or set it to LEVEL.\n"
129                                 "  -n, --net=NETNAME             Connect to net NETNAME.\n"
130                                 "  -L, --mlock                   Lock tinc into main memory.\n"
131                                 "      --logfile[=FILENAME]      Write log entries to a logfile.\n"
132                                 "      --pidfile=FILENAME        Write PID and control socket cookie to FILENAME.\n"
133                                 "      --bypass-security         Disables meta protocol security, for debugging.\n"
134                                 "  -o, --option[HOST.]KEY=VALUE  Set global/host configuration value.\n"
135                                 "  -R, --chroot                  chroot to NET dir at startup.\n"
136                                 "  -U, --user=USER               setuid to given USER at startup.\n"                            "      --help                    Display this help and exit.\n"
137                                 "      --version                 Output version information and exit.\n\n");
138                 printf("Report bugs to tinc@tinc-vpn.org.\n");
139         }
140 }
141
142 static bool parse_options(int argc, char **argv) {
143         config_t *cfg;
144         int r;
145         int option_index = 0;
146         int lineno = 0;
147
148         cmdline_conf = list_alloc((list_action_t)free_config);
149
150         while((r = getopt_long(argc, argv, "c:DLd::n:o:RU:", long_options, &option_index)) != EOF) {
151                 switch (r) {
152                         case 0:                         /* long option */
153                                 break;
154
155                         case 'c':                               /* config file */
156                                 confbase = xstrdup(optarg);
157                                 break;
158
159                         case 'D':                               /* no detach */
160                                 do_detach = false;
161                                 break;
162
163                         case 'L':                               /* no detach */
164 #ifndef HAVE_MLOCKALL
165                                 logger(DEBUG_ALWAYS, LOG_ERR, "%s not supported on this platform", "mlockall()");
166                                 return false;
167 #else
168                                 do_mlock = true;
169                                 break;
170 #endif
171
172                         case 'd':                               /* inc debug level */
173                                 if(optarg)
174                                         debug_level = atoi(optarg);
175                                 else
176                                         debug_level++;
177                                 break;
178
179                         case 'n':                               /* net name given */
180                                 /* netname "." is special: a "top-level name" */
181                                 netname = strcmp(optarg, ".") != 0 ?
182                                                 xstrdup(optarg) : NULL;
183                                 break;
184
185                         case 'o':                               /* option */
186                                 cfg = parse_config_line(optarg, NULL, ++lineno);
187                                 if (!cfg)
188                                         return false;
189                                 list_insert_tail(cmdline_conf, cfg);
190                                 break;
191
192                         case 'R':                               /* chroot to NETNAME dir */
193                                 do_chroot = true;
194                                 break;
195
196                         case 'U':                               /* setuid to USER */
197                                 switchuser = optarg;
198                                 break;
199
200                         case 1:                                 /* show help */
201                                 show_help = true;
202                                 break;
203
204                         case 2:                                 /* show version */
205                                 show_version = true;
206                                 break;
207
208                         case 3:                                 /* bypass security */
209                                 bypass_security = true;
210                                 break;
211
212                         case 4:                                 /* write log entries to a file */
213                                 use_logfile = true;
214                                 if(optarg)
215                                         logfilename = xstrdup(optarg);
216                                 break;
217
218                         case 5:                                 /* open control socket here */
219                                 pidfilename = xstrdup(optarg);
220                                 break;
221
222                         case '?':
223                                 usage(true);
224                                 return false;
225
226                         default:
227                                 break;
228                 }
229         }
230
231         return true;
232 }
233
234 /*
235   Set all files and paths according to netname
236 */
237 static void make_names(void) {
238 #ifdef HAVE_MINGW
239         HKEY key;
240         char installdir[1024] = "";
241         long len = sizeof installdir;
242 #endif
243
244         if(netname)
245                 xasprintf(&identname, "tinc.%s", netname);
246         else
247                 identname = xstrdup("tinc");
248
249 #ifdef HAVE_MINGW
250         if(!RegOpenKeyEx(HKEY_LOCAL_MACHINE, "SOFTWARE\\tinc", 0, KEY_READ, &key)) {
251                 if(!RegQueryValueEx(key, NULL, 0, 0, installdir, &len)) {
252                         if(!logfilename)
253                                 xasprintf(&logfilename, "%s/log/%s.log", identname);
254                         if(!confbase) {
255                                 if(netname)
256                                         xasprintf(&confbase, "%s/%s", installdir, netname);
257                                 else
258                                         xasprintf(&confbase, "%s", installdir);
259                         }
260                         if(!pidfilename)
261                                 xasprintf(&pidfilename, "%s/pid", confbase);
262                 }
263                 RegCloseKey(key);
264                 if(*installdir)
265                         return;
266         }
267 #endif
268
269         if(!logfilename)
270                 xasprintf(&logfilename, LOCALSTATEDIR "/log/%s.log", identname);
271
272         if(!pidfilename)
273                 xasprintf(&pidfilename, LOCALSTATEDIR "/run/%s.pid", identname);
274
275         if(netname) {
276                 if(!confbase)
277                         xasprintf(&confbase, CONFDIR "/tinc/%s", netname);
278                 else
279                         logger(DEBUG_ALWAYS, LOG_INFO, "Both netname and configuration directory given, using the latter...");
280         } else {
281                 if(!confbase)
282                         xasprintf(&confbase, CONFDIR "/tinc");
283         }
284 }
285
286 static void free_names(void) {
287         if (identname) free(identname);
288         if (netname) free(netname);
289         if (pidfilename) free(pidfilename);
290         if (logfilename) free(logfilename);
291         if (confbase) free(confbase);
292 }
293
294 static bool drop_privs(void) {
295 #ifdef HAVE_MINGW
296         if (switchuser) {
297                 logger(DEBUG_ALWAYS, LOG_ERR, "%s not supported on this platform", "-U");
298                 return false;
299         }
300         if (do_chroot) {
301                 logger(DEBUG_ALWAYS, LOG_ERR, "%s not supported on this platform", "-R");
302                 return false;
303         }
304 #else
305         uid_t uid = 0;
306         if (switchuser) {
307                 struct passwd *pw = getpwnam(switchuser);
308                 if (!pw) {
309                         logger(DEBUG_ALWAYS, LOG_ERR, "unknown user `%s'", switchuser);
310                         return false;
311                 }
312                 uid = pw->pw_uid;
313                 if (initgroups(switchuser, pw->pw_gid) != 0 ||
314                     setgid(pw->pw_gid) != 0) {
315                         logger(DEBUG_ALWAYS, LOG_ERR, "System call `%s' failed: %s",
316                                "initgroups", strerror(errno));
317                         return false;
318                 }
319                 endgrent();
320                 endpwent();
321         }
322         if (do_chroot) {
323                 tzset();        /* for proper timestamps in logs */
324                 if (chroot(confbase) != 0 || chdir("/") != 0) {
325                         logger(DEBUG_ALWAYS, LOG_ERR, "System call `%s' failed: %s",
326                                "chroot", strerror(errno));
327                         return false;
328                 }
329                 free(confbase);
330                 confbase = xstrdup("");
331         }
332         if (switchuser)
333                 if (setuid(uid) != 0) {
334                         logger(DEBUG_ALWAYS, LOG_ERR, "System call `%s' failed: %s",
335                                "setuid", strerror(errno));
336                         return false;
337                 }
338 #endif
339         return true;
340 }
341
342 #ifdef HAVE_MINGW
343 # define setpriority(level) !SetPriorityClass(GetCurrentProcess(), (level))
344 #else
345 # define NORMAL_PRIORITY_CLASS 0
346 # define BELOW_NORMAL_PRIORITY_CLASS 10
347 # define HIGH_PRIORITY_CLASS -10
348 # define setpriority(level) (setpriority(PRIO_PROCESS, 0, (level)))
349 #endif
350
351 int main(int argc, char **argv) {
352         program_name = argv[0];
353
354         if(!parse_options(argc, argv))
355                 return 1;
356         
357         make_names();
358
359         if(show_version) {
360                 printf("%s version %s (built %s %s, protocol %d.%d)\n", PACKAGE,
361                            VERSION, __DATE__, __TIME__, PROT_MAJOR, PROT_MINOR);
362                 printf("Copyright (C) 1998-2012 Ivo Timmermans, Guus Sliepen and others.\n"
363                                 "See the AUTHORS file for a complete list.\n\n"
364                                 "tinc comes with ABSOLUTELY NO WARRANTY.  This is free software,\n"
365                                 "and you are welcome to redistribute it under certain conditions;\n"
366                                 "see the file COPYING for details.\n");
367
368                 return 0;
369         }
370
371         if(show_help) {
372                 usage(false);
373                 return 0;
374         }
375
376 #ifdef HAVE_MINGW
377         if(WSAStartup(MAKEWORD(2, 2), &wsa_state)) {
378                 logger(DEBUG_ALWAYS, LOG_ERR, "System call `%s' failed: %s", "WSAStartup", winerror(GetLastError()));
379                 return 1;
380         }
381 #endif
382
383         openlogger("tinc", use_logfile?LOGMODE_FILE:LOGMODE_STDERR);
384
385         g_argv = argv;
386
387         if(getenv("LISTEN_PID") && atoi(getenv("LISTEN_PID")) == getpid())
388                 do_detach = false;
389 #ifdef HAVE_UNSETENV
390         unsetenv("LISTEN_PID");
391 #endif
392
393         init_configuration(&config_tree);
394
395         /* Slllluuuuuuurrrrp! */
396
397         srand(time(NULL));
398         crypto_init();
399
400         if(!read_server_config())
401                 return 1;
402
403 #ifdef HAVE_LZO
404         if(lzo_init() != LZO_E_OK) {
405                 logger(DEBUG_ALWAYS, LOG_ERR, "Error initializing LZO compressor!");
406                 return 1;
407         }
408 #endif
409
410 #ifdef HAVE_MINGW
411         if(!do_detach || !init_service())
412                 return main2(argc, argv);
413         else
414                 return 1;
415 }
416
417 int main2(int argc, char **argv) {
418         InitializeCriticalSection(&mutex);
419         EnterCriticalSection(&mutex);
420 #endif
421         char *priority = NULL;
422
423         if(!detach())
424                 return 1;
425
426 #ifdef HAVE_MLOCKALL
427         /* Lock all pages into memory if requested.
428          * This has to be done after daemon()/fork() so it works for child.
429          * No need to do that in parent as it's very short-lived. */
430         if(do_mlock && mlockall(MCL_CURRENT | MCL_FUTURE) != 0) {
431                 logger(DEBUG_ALWAYS, LOG_ERR, "System call `%s' failed: %s", "mlockall",
432                    strerror(errno));
433                 return 1;
434         }
435 #endif
436
437         if(!event_init()) {
438                 logger(DEBUG_ALWAYS, LOG_ERR, "Error initializing libevent!");
439                 return 1;
440         }
441
442         /* Setup sockets and open device. */
443
444         if(!setup_network())
445                 goto end_nonet;
446
447         if(!init_control())
448                 goto end_nonet;
449
450         /* Initiate all outgoing connections. */
451
452         try_outgoing_connections();
453
454         /* Change process priority */
455
456         if(get_config_string(lookup_config(config_tree, "ProcessPriority"), &priority)) {
457                 if(!strcasecmp(priority, "Normal")) {
458                         if (setpriority(NORMAL_PRIORITY_CLASS) != 0) {
459                                 logger(DEBUG_ALWAYS, LOG_ERR, "System call `%s' failed: %s",
460                                        "setpriority", strerror(errno));
461                                 goto end;
462                         }
463                 } else if(!strcasecmp(priority, "Low")) {
464                         if (setpriority(BELOW_NORMAL_PRIORITY_CLASS) != 0) {
465                                        logger(DEBUG_ALWAYS, LOG_ERR, "System call `%s' failed: %s",
466                                        "setpriority", strerror(errno));
467                                 goto end;
468                         }
469                 } else if(!strcasecmp(priority, "High")) {
470                         if (setpriority(HIGH_PRIORITY_CLASS) != 0) {
471                                 logger(DEBUG_ALWAYS, LOG_ERR, "System call `%s' failed: %s",
472                                        "setpriority", strerror(errno));
473                                 goto end;
474                         }
475                 } else {
476                         logger(DEBUG_ALWAYS, LOG_ERR, "Invalid priority `%s`!", priority);
477                         goto end;
478                 }
479         }
480
481         /* drop privileges */
482         if (!drop_privs())
483                 goto end;
484
485         /* Start main loop. It only exits when tinc is killed. */
486
487         status = main_loop();
488
489         /* Shutdown properly. */
490
491         if(debug_level >= DEBUG_CONNECTIONS)
492                 devops.dump_stats();
493
494         close_network_connections();
495
496 end:
497         exit_control();
498
499 end_nonet:
500         logger(DEBUG_ALWAYS, LOG_NOTICE, "Terminating");
501
502         free(priority);
503
504         crypto_exit();
505
506         exit_configuration(&config_tree);
507         free(cmdline_conf);
508         free_names();
509
510         return status;
511 }