www.tinc-vpn.org Git - tinc/blob - src/tincd.c

   1 /*
   2     tincd.c -- the main file for tincd
   3     Copyright (C) 1998-2002 Ivo Timmermans <ivo@o2w.nl>
   4                   2000-2002 Guus Sliepen <guus@sliepen.eu.org>
   5
   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.
  10
  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.
  15
  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.
  19
  20     $Id: tincd.c,v 1.10.4.71 2003/07/06 23:16:29 guus Exp $
  21 */
  22
  23 #include "config.h"
  24
  25 #include <errno.h>
  26 #include <fcntl.h>
  27 #include <getopt.h>
  28 #include <signal.h>
  29 #include <stdio.h>
  30 #include <sys/types.h>
  31 #include <unistd.h>
  32 #include <signal.h>
  33 #include <string.h>
  34 #include <termios.h>
  35
  36 /* Darwin (MacOS/X) needs the following definition... */
  37 #ifndef _P1003_1B_VISIBLE
  38 #define _P1003_1B_VISIBLE
  39 #endif
  40
  41 #include <sys/mman.h>
  42
  43 #ifdef HAVE_SYS_IOCTL_H
  44 # include <sys/ioctl.h>
  45 #endif
  46
  47 #include <openssl/rand.h>
  48 #include <openssl/rsa.h>
  49 #include <openssl/pem.h>
  50 #include <openssl/evp.h>
  51
  52 #include <lzo1x.h>
  53
  54 #include <utils.h>
  55 #include <xalloc.h>
  56
  57 #include "conf.h"
  58 #include "net.h"
  59 #include "netutl.h"
  60 #include "process.h"
  61 #include "protocol.h"
  62 #include "subnet.h"
  63 #include "logger.h"
  64
  65 #include "system.h"
  66
  67 /* The name this program was run with. */
  68 char *program_name = NULL;
  69
  70 /* If nonzero, display usage information and exit. */
  71 int show_help = 0;
  72
  73 /* If nonzero, print the version on standard output and exit.  */
  74 int show_version = 0;
  75
  76 /* If nonzero, it will attempt to kill a running tincd and exit. */
  77 int kill_tincd = 0;
  78
  79 /* If nonzero, generate public/private keypair for this host/net. */
  80 int generate_keys = 0;
  81
  82 /* If nonzero, use null ciphers and skip all key exchanges. */
  83 int bypass_security = 0;
  84
  85 /* If nonzero, disable swapping for this process. */
  86 int do_mlock = 0;
  87
  88 /* If nonzero, write log entries to a separate file. */
  89 int use_logfile = 0;
  90
  91 char *identname = NULL;                         /* program name for syslog */
  92 char *pidfilename = NULL;                       /* pid file location */
  93 char *logfilename = NULL;                       /* log file location */
  94 char **g_argv;                                  /* a copy of the cmdline arguments */
  95 char **environment;                             /* A pointer to the environment on
  96                                                                    startup */
  97
  98 static struct option const long_options[] = {
  99         {"config", required_argument, NULL, 'c'},
 100         {"kill", optional_argument, NULL, 'k'},
 101         {"net", required_argument, NULL, 'n'},
 102         {"help", no_argument, &show_help, 1},
 103         {"version", no_argument, &show_version, 1},
 104         {"no-detach", no_argument, &do_detach, 0},
 105         {"generate-keys", optional_argument, NULL, 'K'},
 106         {"debug", optional_argument, NULL, 'd'},
 107         {"bypass-security", no_argument, &bypass_security, 1},
 108         {"mlock", no_argument, &do_mlock, 1},
 109         {"logfile", optional_argument, NULL, 'F'},
 110         {NULL, 0, NULL, 0}
 111 };
 112
 113 static void usage(int status)
 114 {
 115         if(status != 0)
 116                 fprintf(stderr, _("Try `%s --help\' for more information.\n"),
 117                                 program_name);
 118         else {
 119                 printf(_("Usage: %s [option]...\n\n"), program_name);
 120                 printf(_("  -c, --config=DIR           Read configuration options from DIR.\n"
 121                                 "  -D, --no-detach            Don't fork and detach.\n"
 122                                 "  -d, --debug[=LEVEL]        Increase debug level or set it to LEVEL.\n"
 123                                 "  -k, --kill[=SIGNAL]        Attempt to kill a running tincd and exit.\n"
 124                                 "  -n, --net=NETNAME          Connect to net NETNAME.\n"
 125                                 "  -K, --generate-keys[=BITS] Generate public/private RSA keypair.\n"
 126                                 "  -L, --mlock                Lock tinc into main memory.\n"
 127                                 "  -F, --logfile[=FILENAME]   Write log entries to a logfile.\n"
 128                                 "      --help                 Display this help and exit.\n"
 129                                 "      --version              Output version information and exit.\n\n"));
 130                 printf(_("Report bugs to tinc@nl.linux.org.\n"));
 131         }
 132
 133         exit(status);
 134 }
 135
 136 static void parse_options(int argc, char **argv, char **envp)
 137 {
 138         int r;
 139         int option_index = 0;
 140
 141         while((r = getopt_long(argc, argv, "c:DLd::k::n:K::F::", long_options, &option_index)) != EOF) {
 142                 switch (r) {
 143                         case 0:                         /* long option */
 144                                 break;
 145
 146                         case 'c':                               /* config file */
 147                                 confbase = xmalloc(strlen(optarg) + 1);
 148                                 strcpy(confbase, optarg);
 149                                 break;
 150
 151                         case 'D':                               /* no detach */
 152                                 do_detach = 0;
 153                                 break;
 154
 155                         case 'L':                               /* no detach */
 156                                 do_mlock = 1;
 157                                 break;
 158
 159                         case 'd':                               /* inc debug level */
 160                                 if(optarg)
 161                                         debug_level = atoi(optarg);
 162                                 else
 163                                         debug_level++;
 164                                 break;
 165
 166                         case 'k':                               /* kill old tincds */
 167                                 if(optarg) {
 168                                         if(!strcasecmp(optarg, "HUP"))
 169                                                 kill_tincd = SIGHUP;
 170                                         else if(!strcasecmp(optarg, "TERM"))
 171                                                 kill_tincd = SIGTERM;
 172                                         else if(!strcasecmp(optarg, "KILL"))
 173                                                 kill_tincd = SIGKILL;
 174                                         else if(!strcasecmp(optarg, "USR1"))
 175                                                 kill_tincd = SIGUSR1;
 176                                         else if(!strcasecmp(optarg, "USR2"))
 177                                                 kill_tincd = SIGUSR2;
 178                                         else if(!strcasecmp(optarg, "WINCH"))
 179                                                 kill_tincd = SIGWINCH;
 180                                         else if(!strcasecmp(optarg, "INT"))
 181                                                 kill_tincd = SIGINT;
 182                                         else if(!strcasecmp(optarg, "ALRM"))
 183                                                 kill_tincd = SIGALRM;
 184                                         else {
 185                                                 kill_tincd = atoi(optarg);
 186
 187                                                 if(!kill_tincd) {
 188                                                         fprintf(stderr, _("Invalid argument `%s'; SIGNAL must be a number or one of HUP, TERM, KILL, USR1, USR2, WINCH, INT or ALRM.\n"),
 189                                                                         optarg);
 190                                                         usage(1);
 191                                                 }
 192                                         }
 193                                 } else
 194                                         kill_tincd = SIGTERM;
 195                                 break;
 196
 197                         case 'n':                               /* net name given */
 198                                 netname = xstrdup(optarg);
 199                                 break;
 200
 201                         case 'K':                               /* generate public/private keypair */
 202                                 if(optarg) {
 203                                         generate_keys = atoi(optarg);
 204
 205                                         if(generate_keys < 512) {
 206                                                 fprintf(stderr, _("Invalid argument `%s'; BITS must be a number equal to or greater than 512.\n"),
 207                                                                 optarg);
 208                                                 usage(1);
 209                                         }
 210
 211                                         generate_keys &= ~7;    /* Round it to bytes */
 212                                 } else
 213                                         generate_keys = 1024;
 214                                 break;
 215
 216                         case 'F':                               /* write log entries to a file */
 217                                 use_logfile = 1;
 218                                 if(optarg)
 219                                         logfilename = xstrdup(optarg);
 220                                 break;
 221
 222                         case '?':
 223                                 usage(1);
 224
 225                         default:
 226                                 break;
 227                 }
 228         }
 229 }
 230
 231 /* This function prettyprints the key generation process */
 232
 233 static void indicator(int a, int b, void *p)
 234 {
 235         switch (a) {
 236                 case 0:
 237                         fprintf(stderr, ".");
 238                         break;
 239
 240                 case 1:
 241                         fprintf(stderr, "+");
 242                         break;
 243
 244                 case 2:
 245                         fprintf(stderr, "-");
 246                         break;
 247
 248                 case 3:
 249                         switch (b) {
 250                                 case 0:
 251                                         fprintf(stderr, " p\n");
 252                                         break;
 253
 254                                 case 1:
 255                                         fprintf(stderr, " q\n");
 256                                         break;
 257
 258                                 default:
 259                                         fprintf(stderr, "?");
 260                         }
 261                         break;
 262
 263                 default:
 264                         fprintf(stderr, "?");
 265         }
 266 }
 267
 268 /*
 269   Generate a public/private RSA keypair, and ask for a file to store
 270   them in.
 271 */
 272 static int keygen(int bits)
 273 {
 274         RSA *rsa_key;
 275         FILE *f;
 276         char *name = NULL;
 277         char *filename;
 278
 279         fprintf(stderr, _("Generating %d bits keys:\n"), bits);
 280         rsa_key = RSA_generate_key(bits, 0xFFFF, indicator, NULL);
 281
 282         if(!rsa_key) {
 283                 fprintf(stderr, _("Error during key generation!\n"));
 284                 return -1;
 285         } else
 286                 fprintf(stderr, _("Done.\n"));
 287
 288         get_config_string(lookup_config(config_tree, "Name"), &name);
 289
 290         if(name)
 291                 asprintf(&filename, "%s/hosts/%s", confbase, name);
 292         else
 293                 asprintf(&filename, "%s/rsa_key.pub", confbase);
 294
 295         f = ask_and_safe_open(filename, _("public RSA key"), "a");
 296
 297         if(!f)
 298                 return -1;
 299
 300         if(ftell(f))
 301                 fprintf(stderr, _("Appending key to existing contents.\nMake sure only one key is stored in the file.\n"));
 302
 303         PEM_write_RSAPublicKey(f, rsa_key);
 304         fclose(f);
 305         free(filename);
 306
 307         asprintf(&filename, "%s/rsa_key.priv", confbase);
 308         f = ask_and_safe_open(filename, _("private RSA key"), "a");
 309
 310         if(!f)
 311                 return -1;
 312
 313         if(ftell(f))
 314                 fprintf(stderr, _("Appending key to existing contents.\nMake sure only one key is stored in the file.\n"));
 315
 316         PEM_write_RSAPrivateKey(f, rsa_key, NULL, NULL, 0, NULL, NULL);
 317         fclose(f);
 318         free(filename);
 319
 320         return 0;
 321 }
 322
 323 /*
 324   Set all files and paths according to netname
 325 */
 326 static void make_names(void)
 327 {
 328         if(netname) {
 329                 if(!pidfilename)
 330                         asprintf(&pidfilename, LOCALSTATEDIR "/run/tinc.%s.pid", netname);
 331                 if(!logfilename)
 332                         asprintf(&logfilename, LOCALSTATEDIR "/log/tinc.%s.log", netname);
 333
 334                 if(!confbase)
 335                         asprintf(&confbase, "%s/tinc/%s", CONFDIR, netname);
 336                 else
 337                         logger(DEBUG_ALWAYS, LOG_INFO, _("Both netname and configuration directory given, using the latter..."));
 338
 339                 if(!identname)
 340                         asprintf(&identname, "tinc.%s", netname);
 341         } else {
 342                 if(!pidfilename)
 343                         pidfilename = LOCALSTATEDIR "/run/tinc.pid";
 344                 if(!logfilename)
 345                         logfilename = LOCALSTATEDIR "/log/tinc.log";
 346
 347                 if(!confbase)
 348                         asprintf(&confbase, "%s/tinc", CONFDIR);
 349
 350                 if(!identname)
 351                         identname = "tinc";
 352         }
 353 }
 354
 355 int main(int argc, char **argv, char **envp)
 356 {
 357         program_name = argv[0];
 358
 359         setlocale(LC_ALL, "");
 360         bindtextdomain(PACKAGE, LOCALEDIR);
 361         textdomain(PACKAGE);
 362
 363         environment = envp;
 364         parse_options(argc, argv, envp);
 365         make_names();
 366
 367         if(show_version) {
 368                 printf(_("%s version %s (built %s %s, protocol %d)\n"), PACKAGE,
 369                            VERSION, __DATE__, __TIME__, PROT_CURRENT);
 370                 printf(_("Copyright (C) 1998-2002 Ivo Timmermans, Guus Sliepen and others.\n"
 371                                 "See the AUTHORS file for a complete list.\n\n"
 372                                 "tinc comes with ABSOLUTELY NO WARRANTY.  This is free software,\n"
 373                                 "and you are welcome to redistribute it under certain conditions;\n"
 374                                 "see the file COPYING for details.\n"));
 375
 376                 return 0;
 377         }
 378
 379         if(show_help)
 380                 usage(0);
 381
 382         if(kill_tincd)
 383                 exit(kill_other(kill_tincd));
 384
 385         openlogger("tinc", LOGMODE_STDERR);
 386
 387         /* Lock all pages into memory if requested */
 388
 389         if(do_mlock)
 390 #ifdef HAVE_MLOCKALL
 391                 if(mlockall(MCL_CURRENT | MCL_FUTURE)) {
 392                         logger(DEBUG_ALWAYS, LOG_ERR, _("System call `%s' failed: %s"), "mlockall",
 393                                    strerror(errno));
 394 #else
 395         {
 396                 logger(DEBUG_ALWAYS, LOG_ERR, _("mlockall() not supported on this platform!"));
 397 #endif
 398                 return -1;
 399         }
 400
 401         g_argv = argv;
 402
 403         init_configuration(&config_tree);
 404
 405         /* Slllluuuuuuurrrrp! */
 406
 407         RAND_load_file("/dev/urandom", 1024);
 408
 409         OpenSSL_add_all_algorithms();
 410
 411         if(generate_keys) {
 412                 read_server_config();
 413                 exit(keygen(generate_keys));
 414         }
 415
 416         if(read_server_config())
 417                 exit(1);
 418
 419         if(lzo_init() != LZO_E_OK) {
 420                 logger(DEBUG_ALWAYS, LOG_ERR, _("Error initializing LZO compressor!"));
 421                 exit(1);
 422         }
 423
 424         if(detach())
 425                 exit(0);
 426
 427         for(;;) {
 428                 if(!setup_network_connections()) {
 429                         main_loop();
 430                         cleanup_and_exit(1);
 431                 }
 432
 433                 logger(DEBUG_ALWAYS, LOG_ERR, _("Unrecoverable error"));
 434                 cp_trace();
 435
 436                 if(do_detach) {
 437                         logger(DEBUG_ALWAYS, LOG_NOTICE, _("Restarting in %d seconds!"), maxtimeout);
 438                         sleep(maxtimeout);
 439                 } else {
 440                         logger(DEBUG_ALWAYS, LOG_ERR, _("Not restarting."));
 441                         exit(1);
 442                 }
 443         }
 444 }