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 1.10.4.66 2003/01/17 00:43:58 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 <syslog.h>
  32 #include <unistd.h>
  33 #include <signal.h>
  34 #include <string.h>
  35 #include <termios.h>
  36
  37 /* Darwin (MacOS/X) needs the following definition... */
  38 #ifndef _P1003_1B_VISIBLE
  39 #define _P1003_1B_VISIBLE
  40 #endif
  41
  42 #include <sys/mman.h>
  43
  44 #ifdef HAVE_SYS_IOCTL_H
  45 # include <sys/ioctl.h>
  46 #endif
  47
  48 #include <openssl/rand.h>
  49 #include <openssl/rsa.h>
  50 #include <openssl/pem.h>
  51 #include <openssl/evp.h>
  52
  53 #include <utils.h>
  54 #include <xalloc.h>
  55
  56 #include "conf.h"
  57 #include "net.h"
  58 #include "netutl.h"
  59 #include "process.h"
  60 #include "protocol.h"
  61 #include "subnet.h"
  62
  63 #include "system.h"
  64
  65 /* The name this program was run with. */
  66 char *program_name;
  67
  68 /* If nonzero, display usage information and exit. */
  69 int show_help;
  70
  71 /* If nonzero, print the version on standard output and exit.  */
  72 int show_version;
  73
  74 /* If nonzero, it will attempt to kill a running tincd and exit. */
  75 int kill_tincd = 0;
  76
  77 /* If nonzero, generate public/private keypair for this host/net. */
  78 int generate_keys = 0;
  79
  80 /* If nonzero, use null ciphers and skip all key exchanges. */
  81 int bypass_security = 0;
  82
  83 /* If nonzero, disable swapping for this process. */
  84 int do_mlock = 0;
  85
  86 char *identname;                                /* program name for syslog */
  87 char *pidfilename;                              /* pid file location */
  88 char **g_argv;                                  /* a copy of the cmdline arguments */
  89 char **environment;                             /* A pointer to the environment on
  90                                                                    startup */
  91
  92 static struct option const long_options[] = {
  93         {"config", required_argument, NULL, 'c'},
  94         {"kill", optional_argument, NULL, 'k'},
  95         {"net", required_argument, NULL, 'n'},
  96         {"help", no_argument, &show_help, 1},
  97         {"version", no_argument, &show_version, 1},
  98         {"no-detach", no_argument, &do_detach, 0},
  99         {"generate-keys", optional_argument, NULL, 'K'},
 100         {"debug", optional_argument, NULL, 'd'},
 101         {"bypass-security", no_argument, &bypass_security, 1},
 102         {"mlock", no_argument, &do_mlock, 1},
 103         {NULL, 0, NULL, 0}
 104 };
 105
 106 static void usage(int status)
 107 {
 108         if(status != 0)
 109                 fprintf(stderr, _("Try `%s --help\' for more information.\n"),
 110                                 program_name);
 111         else {
 112                 printf(_("Usage: %s [option]...\n\n"), program_name);
 113                 printf(_("  -c, --config=DIR           Read configuration options from DIR.\n"
 114                                 "  -D, --no-detach            Don't fork and detach.\n"
 115                                 "  -d, --debug[=LEVEL]        Increase debug level or set it to LEVEL.\n"
 116                                 "  -k, --kill[=SIGNAL]        Attempt to kill a running tincd and exit.\n"
 117                                 "  -n, --net=NETNAME          Connect to net NETNAME.\n"
 118                                 "  -K, --generate-keys[=BITS] Generate public/private RSA keypair.\n"
 119                                 "  -L, --mlock                Lock tinc into main memory.\n"
 120                                 "      --help                 Display this help and exit.\n"
 121                                 "      --version              Output version information and exit.\n\n"));
 122                 printf(_("Report bugs to tinc@nl.linux.org.\n"));
 123         }
 124
 125         exit(status);
 126 }
 127
 128 void parse_options(int argc, char **argv, char **envp)
 129 {
 130         int r;
 131         int option_index = 0;
 132
 133         while((r = getopt_long(argc, argv, "c:DLd::k::n:K::", long_options, &option_index)) != EOF) {
 134                 switch (r) {
 135                         case 0:                         /* long option */
 136                                 break;
 137
 138                         case 'c':                               /* config file */
 139                                 confbase = xmalloc(strlen(optarg) + 1);
 140                                 strcpy(confbase, optarg);
 141                                 break;
 142
 143                         case 'D':                               /* no detach */
 144                                 do_detach = 0;
 145                                 break;
 146
 147                         case 'L':                               /* no detach */
 148                                 do_mlock = 1;
 149                                 break;
 150
 151                         case 'd':                               /* inc debug level */
 152                                 if(optarg)
 153                                         debug_lvl = atoi(optarg);
 154                                 else
 155                                         debug_lvl++;
 156                                 break;
 157
 158                         case 'k':                               /* kill old tincds */
 159                                 if(optarg) {
 160                                         if(!strcasecmp(optarg, "HUP"))
 161                                                 kill_tincd = SIGHUP;
 162                                         else if(!strcasecmp(optarg, "TERM"))
 163                                                 kill_tincd = SIGTERM;
 164                                         else if(!strcasecmp(optarg, "KILL"))
 165                                                 kill_tincd = SIGKILL;
 166                                         else if(!strcasecmp(optarg, "USR1"))
 167                                                 kill_tincd = SIGUSR1;
 168                                         else if(!strcasecmp(optarg, "USR2"))
 169                                                 kill_tincd = SIGUSR2;
 170                                         else if(!strcasecmp(optarg, "WINCH"))
 171                                                 kill_tincd = SIGWINCH;
 172                                         else if(!strcasecmp(optarg, "INT"))
 173                                                 kill_tincd = SIGINT;
 174                                         else if(!strcasecmp(optarg, "ALRM"))
 175                                                 kill_tincd = SIGALRM;
 176                                         else {
 177                                                 kill_tincd = atoi(optarg);
 178
 179                                                 if(!kill_tincd) {
 180                                                         fprintf(stderr, _("Invalid argument `%s'; SIGNAL must be a number or one of HUP, TERM, KILL, USR1, USR2, WINCH, INT or ALRM.\n"),
 181                                                                         optarg);
 182                                                         usage(1);
 183                                                 }
 184                                         }
 185                                 } else
 186                                         kill_tincd = SIGTERM;
 187                                 break;
 188
 189                         case 'n':                               /* net name given */
 190                                 netname = xmalloc(strlen(optarg) + 1);
 191                                 strcpy(netname, optarg);
 192                                 break;
 193
 194                         case 'K':                               /* generate public/private keypair */
 195                                 if(optarg) {
 196                                         generate_keys = atoi(optarg);
 197
 198                                         if(generate_keys < 512) {
 199                                                 fprintf(stderr, _("Invalid argument `%s'; BITS must be a number equal to or greater than 512.\n"),
 200                                                                 optarg);
 201                                                 usage(1);
 202                                         }
 203
 204                                         generate_keys &= ~7;    /* Round it to bytes */
 205                                 } else
 206                                         generate_keys = 1024;
 207                                 break;
 208
 209                         case '?':
 210                                 usage(1);
 211
 212                         default:
 213                                 break;
 214                 }
 215         }
 216 }
 217
 218 /* This function prettyprints the key generation process */
 219
 220 void indicator(int a, int b, void *p)
 221 {
 222         switch (a) {
 223                 case 0:
 224                         fprintf(stderr, ".");
 225                         break;
 226
 227                 case 1:
 228                         fprintf(stderr, "+");
 229                         break;
 230
 231                 case 2:
 232                         fprintf(stderr, "-");
 233                         break;
 234
 235                 case 3:
 236                         switch (b) {
 237                                 case 0:
 238                                         fprintf(stderr, " p\n");
 239                                         break;
 240
 241                                 case 1:
 242                                         fprintf(stderr, " q\n");
 243                                         break;
 244
 245                                 default:
 246                                         fprintf(stderr, "?");
 247                         }
 248                         break;
 249
 250                 default:
 251                         fprintf(stderr, "?");
 252         }
 253 }
 254
 255 /*
 256   Generate a public/private RSA keypair, and ask for a file to store
 257   them in.
 258 */
 259 int keygen(int bits)
 260 {
 261         RSA *rsa_key;
 262         FILE *f;
 263         char *name = NULL;
 264         char *filename;
 265
 266         fprintf(stderr, _("Generating %d bits keys:\n"), bits);
 267         rsa_key = RSA_generate_key(bits, 0xFFFF, indicator, NULL);
 268
 269         if(!rsa_key) {
 270                 fprintf(stderr, _("Error during key generation!\n"));
 271                 return -1;
 272         } else
 273                 fprintf(stderr, _("Done.\n"));
 274
 275         get_config_string(lookup_config(config_tree, "Name"), &name);
 276
 277         if(name)
 278                 asprintf(&filename, "%s/hosts/%s", confbase, name);
 279         else
 280                 asprintf(&filename, "%s/rsa_key.pub", confbase);
 281
 282         f = ask_and_safe_open(filename, _("public RSA key"), "a");
 283
 284         if(!f)
 285                 return -1;
 286
 287         if(ftell(f))
 288                 fprintf(stderr, _("Appending key to existing contents.\nMake sure only one key is stored in the file.\n"));
 289
 290         PEM_write_RSAPublicKey(f, rsa_key);
 291         fclose(f);
 292         free(filename);
 293
 294         asprintf(&filename, "%s/rsa_key.priv", confbase);
 295         f = ask_and_safe_open(filename, _("private 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_RSAPrivateKey(f, rsa_key, NULL, NULL, 0, NULL, NULL);
 304         fclose(f);
 305         free(filename);
 306
 307         return 0;
 308 }
 309
 310 /*
 311   Set all files and paths according to netname
 312 */
 313 void make_names(void)
 314 {
 315         if(netname) {
 316                 if(!pidfilename)
 317                         asprintf(&pidfilename, LOCALSTATEDIR "/run/tinc.%s.pid", netname);
 318
 319                 if(!confbase)
 320                         asprintf(&confbase, "%s/tinc/%s", CONFDIR, netname);
 321                 else
 322                         syslog(LOG_INFO, _("Both netname and configuration directory given, using the latter..."));
 323
 324                 if(!identname)
 325                         asprintf(&identname, "tinc.%s", netname);
 326         } else {
 327                 if(!pidfilename)
 328                         pidfilename = LOCALSTATEDIR "/run/tinc.pid";
 329
 330                 if(!confbase)
 331                         asprintf(&confbase, "%s/tinc", CONFDIR);
 332
 333                 if(!identname)
 334                         identname = "tinc";
 335         }
 336 }
 337
 338 int main(int argc, char **argv, char **envp)
 339 {
 340         program_name = argv[0];
 341
 342         setlocale(LC_ALL, "");
 343         bindtextdomain(PACKAGE, LOCALEDIR);
 344         textdomain(PACKAGE);
 345
 346         environment = envp;
 347         parse_options(argc, argv, envp);
 348
 349         if(show_version) {
 350                 printf(_("%s version %s (built %s %s, protocol %d)\n"), PACKAGE,
 351                            VERSION, __DATE__, __TIME__, PROT_CURRENT);
 352                 printf(_("Copyright (C) 1998-2002 Ivo Timmermans, Guus Sliepen and others.\n"
 353                                 "See the AUTHORS file for a complete list.\n\n"
 354                                 "tinc comes with ABSOLUTELY NO WARRANTY.  This is free software,\n"
 355                                 "and you are welcome to redistribute it under certain conditions;\n"
 356                                 "see the file COPYING for details.\n"));
 357
 358                 return 0;
 359         }
 360
 361         if(show_help)
 362                 usage(0);
 363
 364 #ifndef LOG_PERROR
 365         openlog("tinc", LOG_CONS, LOG_DAEMON);  /* Catch all syslog() calls issued before detaching */
 366 #else
 367         openlog("tinc", LOG_PERROR, LOG_DAEMON);        /* Catch all syslog() calls issued before detaching */
 368 #endif
 369
 370         /* Lock all pages into memory if requested */
 371
 372         if(do_mlock)
 373 #ifdef HAVE_MLOCKALL
 374                 if(mlockall(MCL_CURRENT | MCL_FUTURE)) {
 375                         syslog(LOG_ERR, _("System call `%s' failed: %s"), "mlockall",
 376                                    strerror(errno));
 377 #else
 378         {
 379                 syslog(LOG_ERR, _("mlockall() not supported on this platform!"));
 380 #endif
 381                 return -1;
 382         }
 383
 384         g_argv = argv;
 385
 386         make_names();
 387         init_configuration(&config_tree);
 388
 389         /* Slllluuuuuuurrrrp! */
 390
 391         RAND_load_file("/dev/urandom", 1024);
 392
 393 #ifdef HAVE_OPENSSL_ADD_ALL_ALGORITHMS_NOCONF
 394         OPENSSL_add_all_algorithms_noconf();
 395 #else
 396 #ifdef HAVE_OPENSSL_ADD_ALL_ALGORITHMS
 397         OpenSSL_add_all_algorithms();
 398 #else
 399 #ifdef HAVE_SSLEAY_ADD_ALL_ALGORITHMS
 400         SSLeay_add_all_algorithms();
 401 #else
 402 #error No add_all_algorithms function available!
 403 #endif
 404 #endif
 405 #endif
 406
 407         if(generate_keys) {
 408                 read_server_config();
 409                 exit(keygen(generate_keys));
 410         }
 411
 412         if(kill_tincd)
 413                 exit(kill_other(kill_tincd));
 414
 415         if(read_server_config())
 416                 exit(1);
 417
 418         if(detach())
 419                 exit(0);
 420
 421         for(;;) {
 422                 if(!setup_network_connections()) {
 423                         main_loop();
 424                         cleanup_and_exit(1);
 425                 }
 426
 427                 syslog(LOG_ERR, _("Unrecoverable error"));
 428                 cp_trace();
 429
 430                 if(do_detach) {
 431                         syslog(LOG_NOTICE, _("Restarting in %d seconds!"), maxtimeout);
 432                         sleep(maxtimeout);
 433                 } else {
 434                         syslog(LOG_ERR, _("Not restarting."));
 435                         exit(1);
 436                 }
 437         }
 438 }