Link tincctl with dropin.o.
[tinc] / src / tincd.c
1 /*
2     tincd.c -- the main file for tincd
3     Copyright (C) 1998-2005 Ivo Timmermans
4                   2000-2010 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 bool show_help = false;
71
72 /* If nonzero, print the version on standard output and exit.  */
73 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 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 *controlcookiename = NULL;
93 char **g_argv;                                  /* a copy of the cmdline arguments */
94
95 static int status;
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         {"controlcookie", required_argument, NULL, 5},
110         {NULL, 0, NULL, 0}
111 };
112
113 #ifdef HAVE_MINGW
114 static struct WSAData wsa_state;
115 CRITICAL_SECTION mutex;
116 int main2(int argc, char **argv);
117 #endif
118
119 static void usage(bool status) {
120         if(status)
121                 fprintf(stderr, "Try `%s --help\' for more information.\n",
122                                 program_name);
123         else {
124                 printf("Usage: %s [option]...\n\n", program_name);
125                 printf( "  -c, --config=DIR              Read configuration options from DIR.\n"
126                                 "  -D, --no-detach               Don't fork and detach.\n"
127                                 "  -d, --debug[=LEVEL]           Increase debug level or set it to LEVEL.\n"
128                                 "  -n, --net=NETNAME             Connect to net NETNAME.\n"
129                                 "  -L, --mlock                   Lock tinc into main memory.\n"
130                                 "      --logfile[=FILENAME]      Write log entries to a logfile.\n"
131                                 "      --controlcookie=FILENAME  Write control socket cookie to FILENAME.\n"
132                                 "      --bypass-security         Disables meta protocol security, for debugging.\n"
133                                 "  -o [HOST.]KEY=VALUE           Set global/host configuration value.\n"
134                                 "  -R, --chroot                  chroot to NET dir at startup.\n"
135                                 "  -U, --user=USER               setuid to given USER at startup.\n"                            "      --help                    Display this help and exit.\n"
136                                 "      --version                 Output version information and exit.\n\n");
137                 printf("Report bugs to tinc@tinc-vpn.org.\n");
138         }
139 }
140
141 static bool parse_options(int argc, char **argv) {
142         config_t *cfg;
143         int r;
144         int option_index = 0;
145         int lineno = 0;
146
147         cmdline_conf = list_alloc((list_action_t)free_config);
148
149         while((r = getopt_long(argc, argv, "c:DLd::n:o:RU:", long_options, &option_index)) != EOF) {
150                 switch (r) {
151                         case 0:                         /* long option */
152                                 break;
153
154                         case 'c':                               /* config file */
155                                 confbase = xstrdup(optarg);
156                                 break;
157
158                         case 'D':                               /* no detach */
159                                 do_detach = false;
160                                 break;
161
162                         case 'L':                               /* no detach */
163 #ifndef HAVE_MLOCKALL
164                                 logger(LOG_ERR, "%s not supported on this platform", "mlockall()");
165                                 return false;
166 #else
167                                 do_mlock = true;
168                                 break;
169 #endif
170
171                         case 'd':                               /* inc debug level */
172                                 if(optarg)
173                                         debug_level = atoi(optarg);
174                                 else
175                                         debug_level++;
176                                 break;
177
178                         case 'n':                               /* net name given */
179                                 /* netname "." is special: a "top-level name" */
180                                 netname = strcmp(optarg, ".") != 0 ?
181                                                 xstrdup(optarg) : NULL;
182                                 break;
183
184                         case 'o':                               /* option */
185                                 cfg = parse_config_line(optarg, NULL, ++lineno);
186                                 if (!cfg)
187                                         return false;
188                                 list_insert_tail(cmdline_conf, cfg);
189                                 break;
190
191                         case 'R':                               /* chroot to NETNAME dir */
192                                 do_chroot = true;
193                                 break;
194
195                         case 'U':                               /* setuid to USER */
196                                 switchuser = optarg;
197                                 break;
198
199                         case 1:                                 /* show help */
200                                 show_help = true;
201                                 break;
202
203                         case 2:                                 /* show version */
204                                 show_version = true;
205                                 break;
206
207                         case 3:                                 /* bypass security */
208                                 bypass_security = true;
209                                 break;
210
211                         case 4:                                 /* write log entries to a file */
212                                 use_logfile = true;
213                                 if(optarg)
214                                         logfilename = xstrdup(optarg);
215                                 break;
216
217                         case 5:                                 /* open control socket here */
218                                 controlcookiename = xstrdup(optarg);
219                                 break;
220
221                         case '?':
222                                 usage(true);
223                                 return false;
224
225                         default:
226                                 break;
227                 }
228         }
229
230         return true;
231 }
232
233 /*
234   Set all files and paths according to netname
235 */
236 static void make_names(void) {
237 #ifdef HAVE_MINGW
238         HKEY key;
239         char installdir[1024] = "";
240         long len = sizeof installdir;
241 #endif
242
243         if(netname)
244                 xasprintf(&identname, "tinc.%s", netname);
245         else
246                 identname = xstrdup("tinc");
247
248 #ifdef HAVE_MINGW
249         if(!RegOpenKeyEx(HKEY_LOCAL_MACHINE, "SOFTWARE\\tinc", 0, KEY_READ, &key)) {
250                 if(!RegQueryValueEx(key, NULL, 0, 0, installdir, &len)) {
251                         if(!logfilename)
252                                 xasprintf(&logfilename, "%s/log/%s.log", identname);
253                         if(!confbase) {
254                                 if(netname)
255                                         xasprintf(&confbase, "%s/%s", installdir, netname);
256                                 else
257                                         xasprintf(&confbase, "%s", installdir);
258                         }
259                         if(!controlcookiename)
260                                 xasprintf(&controlcookiename, "%s/cookie", confbase);
261                 }
262                 RegCloseKey(key);
263                 if(*installdir)
264                         return;
265         }
266 #endif
267
268         if(!logfilename)
269                 xasprintf(&logfilename, LOCALSTATEDIR "/log/%s.log", identname);
270
271         if(!controlcookiename)
272                 xasprintf(&controlcookiename, LOCALSTATEDIR "/run/%s.cookie", identname);
273
274         if(netname) {
275                 if(!confbase)
276                         xasprintf(&confbase, CONFDIR "/tinc/%s", netname);
277                 else
278                         logger(LOG_INFO, "Both netname and configuration directory given, using the latter...");
279         } else {
280                 if(!confbase)
281                         xasprintf(&confbase, CONFDIR "/tinc");
282         }
283 }
284
285 static void free_names() {
286         if (identname) free(identname);
287         if (netname) free(netname);
288         if (controlcookiename) free(controlcookiename);
289         if (logfilename) free(logfilename);
290         if (confbase) free(confbase);
291 }
292
293 static bool drop_privs() {
294 #ifdef HAVE_MINGW
295         if (switchuser) {
296                 logger(LOG_ERR, "%s not supported on this platform", "-U");
297                 return false;
298         }
299         if (do_chroot) {
300                 logger(LOG_ERR, "%s not supported on this platform", "-R");
301                 return false;
302         }
303 #else
304         uid_t uid = 0;
305         if (switchuser) {
306                 struct passwd *pw = getpwnam(switchuser);
307                 if (!pw) {
308                         logger(LOG_ERR, "unknown user `%s'", switchuser);
309                         return false;
310                 }
311                 uid = pw->pw_uid;
312                 if (initgroups(switchuser, pw->pw_gid) != 0 ||
313                     setgid(pw->pw_gid) != 0) {
314                         logger(LOG_ERR, "System call `%s' failed: %s",
315                                "initgroups", strerror(errno));
316                         return false;
317                 }
318                 endgrent();
319                 endpwent();
320         }
321         if (do_chroot) {
322                 tzset();        /* for proper timestamps in logs */
323                 if (chroot(confbase) != 0 || chdir("/") != 0) {
324                         logger(LOG_ERR, "System call `%s' failed: %s",
325                                "chroot", strerror(errno));
326                         return false;
327                 }
328                 free(confbase);
329                 confbase = xstrdup("");
330         }
331         if (switchuser)
332                 if (setuid(uid) != 0) {
333                         logger(LOG_ERR, "System call `%s' failed: %s",
334                                "setuid", strerror(errno));
335                         return false;
336                 }
337 #endif
338         return true;
339 }
340
341 #ifdef HAVE_MINGW
342 # define setpriority(level) SetPriorityClass(GetCurrentProcess(), level)
343 #else
344 # define NORMAL_PRIORITY_CLASS 0
345 # define BELOW_NORMAL_PRIORITY_CLASS 10
346 # define HIGH_PRIORITY_CLASS -10
347 # define setpriority(level) nice(level)
348 #endif
349
350 int main(int argc, char **argv) {
351         program_name = argv[0];
352
353         if(!parse_options(argc, argv))
354                 return 1;
355         
356         make_names();
357
358         if(show_version) {
359                 printf("%s version %s (built %s %s, protocol %d)\n", PACKAGE,
360                            VERSION, __DATE__, __TIME__, PROT_CURRENT);
361                 printf("Copyright (C) 1998-2010 Ivo Timmermans, Guus Sliepen and others.\n"
362                                 "See the AUTHORS file for a complete list.\n\n"
363                                 "tinc comes with ABSOLUTELY NO WARRANTY.  This is free software,\n"
364                                 "and you are welcome to redistribute it under certain conditions;\n"
365                                 "see the file COPYING for details.\n");
366
367                 return 0;
368         }
369
370         if(show_help) {
371                 usage(false);
372                 return 0;
373         }
374
375 #ifdef HAVE_MINGW
376         if(WSAStartup(MAKEWORD(2, 2), &wsa_state)) {
377                 logger(LOG_ERR, "System call `%s' failed: %s", "WSAStartup", winerror(GetLastError()));
378                 return 1;
379         }
380 #endif
381
382         openlogger("tinc", use_logfile?LOGMODE_FILE:LOGMODE_STDERR);
383
384         if(!event_init()) {
385                 logger(LOG_ERR, "Error initializing libevent!");
386                 return 1;
387         }
388
389         g_argv = argv;
390
391         init_configuration(&config_tree);
392
393         /* Slllluuuuuuurrrrp! */
394
395         srand(time(NULL));
396         crypto_init();
397
398         if(!read_server_config())
399                 return 1;
400
401 #ifdef HAVE_LZO
402         if(lzo_init() != LZO_E_OK) {
403                 logger(LOG_ERR, "Error initializing LZO compressor!");
404                 return 1;
405         }
406 #endif
407
408 #ifdef HAVE_MINGW
409         if(!do_detach || !init_service())
410                 return main2(argc, argv);
411         else
412                 return 1;
413 }
414
415 int main2(int argc, char **argv) {
416         InitializeCriticalSection(&mutex);
417         EnterCriticalSection(&mutex);
418 #endif
419
420         if(!detach())
421                 return 1;
422
423 #ifdef HAVE_MLOCKALL
424         /* Lock all pages into memory if requested.
425          * This has to be done after daemon()/fork() so it works for child.
426          * No need to do that in parent as it's very short-lived. */
427         if(do_mlock && mlockall(MCL_CURRENT | MCL_FUTURE) != 0) {
428                 logger(LOG_ERR, "System call `%s' failed: %s", "mlockall",
429                    strerror(errno));
430                 return 1;
431         }
432 #endif
433
434         /* Setup sockets and open device. */
435
436         if(!setup_network())
437                 goto end;
438
439         if(!init_control())
440                 return 1;
441
442         /* Initiate all outgoing connections. */
443
444         try_outgoing_connections();
445
446         /* Change process priority */
447
448         char *priority = 0;
449
450         if(get_config_string(lookup_config(config_tree, "ProcessPriority"), &priority)) {
451                 if(!strcasecmp(priority, "Normal")) {
452                         if (setpriority(NORMAL_PRIORITY_CLASS) != 0) {
453                                 logger(LOG_ERR, "System call `%s' failed: %s",
454                                        "setpriority", strerror(errno));
455                                 goto end;
456                         }
457                 } else if(!strcasecmp(priority, "Low")) {
458                         if (setpriority(BELOW_NORMAL_PRIORITY_CLASS) != 0) {
459                                        logger(LOG_ERR, "System call `%s' failed: %s",
460                                        "setpriority", strerror(errno));
461                                 goto end;
462                         }
463                 } else if(!strcasecmp(priority, "High")) {
464                         if (setpriority(HIGH_PRIORITY_CLASS) != 0) {
465                                 logger(LOG_ERR, "System call `%s' failed: %s",
466                                        "setpriority", strerror(errno));
467                                 goto end;
468                         }
469                 } else {
470                         logger(LOG_ERR, "Invalid priority `%s`!", priority);
471                         goto end;
472                 }
473         }
474
475         /* drop privileges */
476         if (!drop_privs())
477                 goto end;
478
479         /* Start main loop. It only exits when tinc is killed. */
480
481         status = main_loop();
482
483         /* Shutdown properly. */
484
485         ifdebug(CONNECTIONS)
486                 dump_device_stats();
487
488         close_network_connections();
489
490 end:
491         logger(LOG_NOTICE, "Terminating");
492
493         exit_control();
494
495         crypto_exit();
496
497         exit_configuration(&config_tree);
498         free_names();
499
500         return status;
501 }