tinc-vpn.org Git - tinc/blob - src/tincctl.c

   1 /*
   2     tincctl.c -- Controlling a running tincd
   3     Copyright (C) 2007 Guus Sliepen <guus@tinc-vpn.org>
   4
   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.
   9
  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.
  14
  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.
  18
  19     $Id$
  20 */
  21
  22 #include "system.h"
  23
  24 #include <sys/un.h>
  25 #include <openssl/rand.h>
  26 #include <openssl/rsa.h>
  27 #include <openssl/pem.h>
  28 #include <openssl/evp.h>
  29 #include <openssl/engine.h>
  30
  31 #include <getopt.h>
  32
  33 #include "xalloc.h"
  34 #include "protocol.h"
  35 #include "control_common.h"
  36
  37 /* The name this program was run with. */
  38 char *program_name = NULL;
  39
  40 /* If nonzero, display usage information and exit. */
  41 bool show_help = false;
  42
  43 /* If nonzero, print the version on standard output and exit.  */
  44 bool show_version = false;
  45
  46 /* If nonzero, it will attempt to kill a running tincd and exit. */
  47 int kill_tincd = 0;
  48
  49 /* If nonzero, generate public/private keypair for this host/net. */
  50 int generate_keys = 0;
  51
  52 static char *identname = NULL;                          /* program name for syslog */
  53 static char *controlsocketname = NULL;                  /* pid file location */
  54 char *netname = NULL;
  55 char *confbase = NULL;
  56
  57 static struct option const long_options[] = {
  58         {"config", required_argument, NULL, 'c'},
  59         {"net", required_argument, NULL, 'n'},
  60         {"help", no_argument, NULL, 1},
  61         {"version", no_argument, NULL, 2},
  62         {"controlsocket", required_argument, NULL, 5},
  63         {NULL, 0, NULL, 0}
  64 };
  65
  66 static void usage(bool status) {
  67         if(status)
  68                 fprintf(stderr, _("Try `%s --help\' for more information.\n"),
  69                                 program_name);
  70         else {
  71                 printf(_("Usage: %s [options] command\n\n"), program_name);
  72                 printf(_("Valid options are:\n"
  73                                 "  -c, --config=DIR              Read configuration options from DIR.\n"
  74                                 "  -n, --net=NETNAME             Connect to net NETNAME.\n"
  75                                 "      --controlsocket=FILENAME  Open control socket at FILENAME.\n"
  76                                 "      --help                    Display this help and exit.\n"
  77                                 "      --version                 Output version information and exit.\n"
  78                                 "\n"
  79                                 "Valid commands are:\n"
  80                                 "  start                      Start tincd.\n"
  81                                 "  stop                       Stop tincd.\n"
  82                                 "  restart                    Restart tincd.\n"
  83                                 "  reload                     Reload configuration of running tincd.\n"
  84                                 "  pid                        Show PID of currently running tincd.\n"
  85                                 "  generate-keys [bits]       Generate a new public/private keypair.\n"
  86                                 "  dump                       Dump a list of one of the following things:\n"
  87                                 "    nodes                    - all known nodes in the VPN\n"
  88                                 "    edges                    - all known connections in the VPN\n"
  89                                 "    subnets                  - all known subnets in the VPN\n"
  90                                 "    connections              - all meta connections with ourself\n"
  91                                 "    graph                    - graph of the VPN in dotty format\n"
  92                                 "  purge                      Purge unreachable nodes\n"
  93                                 "  debug N                    Set debug level\n"
  94                                 "  retry                      Retry all outgoing connections\n"
  95                                 "\n"));
  96                 printf(_("Report bugs to tinc@tinc-vpn.org.\n"));
  97         }
  98 }
  99
 100 static bool parse_options(int argc, char **argv) {
 101         int r;
 102         int option_index = 0;
 103
 104         while((r = getopt_long(argc, argv, "c:n:", long_options, &option_index)) != EOF) {
 105                 switch (r) {
 106                         case 0:                         /* long option */
 107                                 break;
 108
 109                         case 'c':                               /* config file */
 110                                 confbase = xstrdup(optarg);
 111                                 break;
 112
 113                         case 'n':                               /* net name given */
 114                                 netname = xstrdup(optarg);
 115                                 break;
 116
 117                         case 1:                                 /* show help */
 118                                 show_help = true;
 119                                 break;
 120
 121                         case 2:                                 /* show version */
 122                                 show_version = true;
 123                                 break;
 124
 125                         case 5:                                 /* open control socket here */
 126                                 controlsocketname = xstrdup(optarg);
 127                                 break;
 128
 129                         case '?':
 130                                 usage(true);
 131                                 return false;
 132
 133                         default:
 134                                 break;
 135                 }
 136         }
 137
 138         return true;
 139 }
 140
 141 FILE *ask_and_open(const char *filename, const char *what, const char *mode) {
 142         FILE *r;
 143         char *directory;
 144         char buf[PATH_MAX];
 145         char buf2[PATH_MAX];
 146         size_t len;
 147
 148         /* Check stdin and stdout */
 149         if(isatty(0) && isatty(1)) {
 150                 /* Ask for a file and/or directory name. */
 151                 fprintf(stdout, _("Please enter a file to save %s to [%s]: "),
 152                                 what, filename);
 153                 fflush(stdout);
 154
 155                 if(fgets(buf, sizeof buf, stdin) < 0) {
 156                         fprintf(stderr, _("Error while reading stdin: %s\n"),
 157                                         strerror(errno));
 158                         return NULL;
 159                 }
 160
 161                 len = strlen(buf);
 162                 if(len)
 163                         buf[--len] = 0;
 164
 165                 if(len)
 166                         filename = buf;
 167         }
 168
 169 #ifdef HAVE_MINGW
 170         if(filename[0] != '\\' && filename[0] != '/' && !strchr(filename, ':')) {
 171 #else
 172         if(filename[0] != '/') {
 173 #endif
 174                 /* The directory is a relative path or a filename. */
 175                 directory = get_current_dir_name();
 176                 snprintf(buf2, sizeof buf2, "%s/%s", directory, filename);
 177                 filename = buf2;
 178         }
 179
 180         umask(0077);                            /* Disallow everything for group and other */
 181
 182         /* Open it first to keep the inode busy */
 183
 184         r = fopen(filename, mode);
 185
 186         if(!r) {
 187                 fprintf(stderr, _("Error opening file `%s': %s\n"), filename, strerror(errno));
 188                 return NULL;
 189         }
 190
 191         return r;
 192 }
 193
 194 /* This function prettyprints the key generation process */
 195
 196 static void indicator(int a, int b, void *p) {
 197         switch (a) {
 198                 case 0:
 199                         fprintf(stderr, ".");
 200                         break;
 201
 202                 case 1:
 203                         fprintf(stderr, "+");
 204                         break;
 205
 206                 case 2:
 207                         fprintf(stderr, "-");
 208                         break;
 209
 210                 case 3:
 211                         switch (b) {
 212                                 case 0:
 213                                         fprintf(stderr, " p\n");
 214                                         break;
 215
 216                                 case 1:
 217                                         fprintf(stderr, " q\n");
 218                                         break;
 219
 220                                 default:
 221                                         fprintf(stderr, "?");
 222                         }
 223                         break;
 224
 225                 default:
 226                         fprintf(stderr, "?");
 227         }
 228 }
 229
 230 /*
 231   Generate a public/private RSA keypair, and ask for a file to store
 232   them in.
 233 */
 234 static bool keygen(int bits) {
 235         RSA *rsa_key;
 236         FILE *f;
 237         char *name = NULL;
 238         char *filename;
 239
 240         fprintf(stderr, _("Generating %d bits keys:\n"), bits);
 241         rsa_key = RSA_generate_key(bits, 0x10001, indicator, NULL);
 242
 243         if(!rsa_key) {
 244                 fprintf(stderr, _("Error during key generation!\n"));
 245                 return false;
 246         } else
 247                 fprintf(stderr, _("Done.\n"));
 248
 249         asprintf(&filename, "%s/rsa_key.priv", confbase);
 250         f = ask_and_open(filename, _("private RSA key"), "a");
 251
 252         if(!f)
 253                 return false;
 254
 255 #ifdef HAVE_FCHMOD
 256         /* Make it unreadable for others. */
 257         fchmod(fileno(f), 0600);
 258 #endif
 259
 260         if(ftell(f))
 261                 fprintf(stderr, _("Appending key to existing contents.\nMake sure only one key is stored in the file.\n"));
 262
 263         PEM_write_RSAPrivateKey(f, rsa_key, NULL, NULL, 0, NULL, NULL);
 264         fclose(f);
 265         free(filename);
 266
 267         if(name)
 268                 asprintf(&filename, "%s/hosts/%s", confbase, name);
 269         else
 270                 asprintf(&filename, "%s/rsa_key.pub", confbase);
 271
 272         f = ask_and_open(filename, _("public RSA key"), "a");
 273
 274         if(!f)
 275                 return false;
 276
 277         if(ftell(f))
 278                 fprintf(stderr, _("Appending key to existing contents.\nMake sure only one key is stored in the file.\n"));
 279
 280         PEM_write_RSAPublicKey(f, rsa_key);
 281         fclose(f);
 282         free(filename);
 283
 284         return true;
 285 }
 286
 287 /*
 288   Set all files and paths according to netname
 289 */
 290 static void make_names(void) {
 291 #ifdef HAVE_MINGW
 292         HKEY key;
 293         char installdir[1024] = "";
 294         long len = sizeof(installdir);
 295 #endif
 296
 297         if(netname)
 298                 asprintf(&identname, "tinc.%s", netname);
 299         else
 300                 identname = xstrdup("tinc");
 301
 302 #ifdef HAVE_MINGW
 303         if(!RegOpenKeyEx(HKEY_LOCAL_MACHINE, "SOFTWARE\\tinc", 0, KEY_READ, &key)) {
 304                 if(!RegQueryValueEx(key, NULL, 0, 0, installdir, &len)) {
 305                         if(!logfilename)
 306                                 asprintf(&logfilename, "%s/log/%s.log", identname);
 307                         if(!confbase) {
 308                                 if(netname)
 309                                         asprintf(&confbase, "%s/%s", installdir, netname);
 310                                 else
 311                                         asprintf(&confbase, "%s", installdir);
 312                         }
 313                 }
 314                 RegCloseKey(key);
 315                 if(*installdir)
 316                         return;
 317         }
 318 #endif
 319
 320         if(!controlsocketname)
 321                 asprintf(&controlsocketname, LOCALSTATEDIR "/run/%s.control", identname);
 322
 323         if(netname) {
 324                 if(!confbase)
 325                         asprintf(&confbase, CONFDIR "/tinc/%s", netname);
 326                 else
 327                         fprintf(stderr, _("Both netname and configuration directory given, using the latter...\n"));
 328         } else {
 329                 if(!confbase)
 330                         asprintf(&confbase, CONFDIR "/tinc");
 331         }
 332 }
 333
 334 static int fullread(int fd, void *data, size_t datalen) {
 335         int rv, len = 0;
 336
 337         while (len < datalen) {
 338                 rv = read(fd, data + len, datalen - len);
 339                 if(rv == -1 && errno == EINTR)
 340                         continue;
 341                 else if (rv == -1)
 342                         return rv;
 343                 else if (rv == 0) {
 344                         errno = ENODATA;
 345                         return -1;
 346                 }
 347                 len += rv;
 348         }
 349         return 0;
 350 }
 351
 352 /*
 353    Send a request (raw)
 354 */
 355 static int send_ctl_request(int fd, enum request_type type,
 356                                                    void const *outdata, size_t outdatalen,
 357                                                    int *res_errno_p, void **indata_p,
 358                                                    size_t *indatalen_p) {
 359         tinc_ctl_request_t req;
 360         int rv;
 361         struct iovec vector[2] = {
 362                 {&req, sizeof(req)},
 363                 {(void*) outdata, outdatalen}
 364         };
 365         void *indata;
 366
 367         if(res_errno_p == NULL)
 368                 return -1;
 369
 370         memset(&req, 0, sizeof req);
 371         req.length = sizeof req + outdatalen;
 372         req.type = type;
 373         req.res_errno = 0;
 374
 375         while((rv = writev(fd, vector, 2)) == -1 && errno == EINTR) ;
 376         if(rv != req.length)
 377                 return -1;
 378
 379         if(fullread(fd, &req, sizeof req) == -1)
 380                 return -1;
 381
 382         if(req.length < sizeof req) {
 383                 errno = EINVAL;
 384                 return -1;
 385         }
 386
 387         if(req.length > sizeof req) {
 388                 if (indata_p == NULL) {
 389                         errno = EINVAL;
 390                         return -1;
 391                 }
 392
 393                 indata = xmalloc(req.length - sizeof req);
 394
 395                 if(fullread(fd, indata, req.length - sizeof req) == -1) {
 396                         free(indata);
 397                         return -1;
 398                 }
 399
 400                 *indata_p = indata;
 401                 if(indatalen_p != NULL)
 402                         *indatalen_p = req.length - sizeof req;
 403         }
 404
 405         *res_errno_p = req.res_errno;
 406
 407         return 0;
 408 }
 409
 410 /*
 411    Send a request (with printfs)
 412 */
 413 static int send_ctl_request_cooked(int fd, enum request_type type,
 414                                                                    void const *outdata, size_t outdatalen)
 415 {
 416         int res_errno = -1;
 417         char *buf = NULL;
 418         size_t buflen = 0;
 419
 420         if(send_ctl_request(fd, type, outdata, outdatalen, &res_errno,
 421                                                 (void**) &buf, &buflen)) {
 422                 fprintf(stderr, _("Error sending request: %s\n"), strerror(errno));
 423                 return -1;
 424         }
 425
 426         if(buf != NULL) {
 427                 printf("%*s", buflen, buf);
 428                 free(buf);
 429         }
 430
 431         if(res_errno != 0) {
 432                 fprintf(stderr, _("Server reported error: %s\n"), strerror(res_errno));
 433                 return -1;
 434         }
 435
 436         return 0;
 437 }
 438
 439 int main(int argc, char *argv[], char *envp[]) {
 440         struct sockaddr_un addr;
 441         int fd;
 442         int len;
 443         tinc_ctl_greeting_t greeting;
 444         tinc_ctl_request_t req;
 445
 446         program_name = argv[0];
 447
 448         setlocale(LC_ALL, "");
 449         bindtextdomain(PACKAGE, LOCALEDIR);
 450         textdomain(PACKAGE);
 451
 452         if(!parse_options(argc, argv))
 453                 return 1;
 454
 455         make_names();
 456
 457         if(show_version) {
 458                 printf(_("%s version %s (built %s %s, protocol %d)\n"), PACKAGE,
 459                            VERSION, __DATE__, __TIME__, PROT_CURRENT);
 460                 printf(_("Copyright (C) 1998-2007 Ivo Timmermans, Guus Sliepen and others.\n"
 461                                 "See the AUTHORS file for a complete list.\n\n"
 462                                 "tinc comes with ABSOLUTELY NO WARRANTY.  This is free software,\n"
 463                                 "and you are welcome to redistribute it under certain conditions;\n"
 464                                 "see the file COPYING for details.\n"));
 465
 466                 return 0;
 467         }
 468
 469         if(show_help) {
 470                 usage(false);
 471                 return 0;
 472         }
 473
 474         if(optind >= argc) {
 475                 fprintf(stderr, _("Not enough arguments.\n"));
 476                 usage(true);
 477                 return 1;
 478         }
 479
 480         // First handle commands that don't involve connecting to a running tinc daemon.
 481
 482         if(!strcasecmp(argv[optind], "generate-keys")) {
 483                 return !keygen(optind > argc ? atoi(argv[optind + 1]) : 1024);
 484         }
 485
 486         if(!strcasecmp(argv[optind], "start")) {
 487                 argv[optind] = NULL;
 488                 execve("tincd", argv, envp);
 489                 fprintf(stderr, _("Could not start tincd: %s"), strerror(errno));
 490                 return 1;
 491         }
 492
 493         // Now handle commands that do involve connecting to a running tinc daemon.
 494
 495         if(strlen(controlsocketname) >= sizeof addr.sun_path) {
 496                 fprintf(stderr, _("Control socket filename too long!\n"));
 497                 return 1;
 498         }
 499
 500         fd = socket(PF_UNIX, SOCK_STREAM, 0);
 501         if(fd < 0) {
 502                 fprintf(stderr, _("Cannot create UNIX socket: %s\n"), strerror(errno));
 503                 return 1;
 504         }
 505
 506         memset(&addr, 0, sizeof addr);
 507         addr.sun_family = AF_UNIX;
 508         strncpy(addr.sun_path, controlsocketname, sizeof addr.sun_path - 1);
 509
 510         if(connect(fd, (struct sockaddr *)&addr, sizeof addr) < 0) {
 511                 fprintf(stderr, _("Cannot connect to %s: %s\n"), controlsocketname, strerror(errno));
 512                 return 1;
 513         }
 514
 515         if(fullread(fd, &greeting, sizeof greeting) == -1) {
 516                 fprintf(stderr, _("Cannot read greeting from control socket: %s\n"),
 517                                 strerror(errno));
 518                 return 1;
 519         }
 520
 521         if(greeting.version != TINC_CTL_VERSION_CURRENT) {
 522                 fprintf(stderr, _("Version mismatch: server %d, client %d\n"),
 523                                 greeting.version, TINC_CTL_VERSION_CURRENT);
 524                 return 1;
 525         }
 526
 527         struct ucred cred;
 528         socklen_t credlen = sizeof cred;
 529
 530         if(getsockopt(fd, SOL_SOCKET, SO_PEERCRED, &cred, &credlen) < 0) {
 531                 fprintf(stderr, _("Could not obtain PID: %s\n"), strerror(errno));
 532                 return 1;
 533         }
 534
 535         if(!strcasecmp(argv[optind], "pid")) {
 536                 printf("%d\n", cred.pid);
 537                 return 0;
 538         }
 539
 540         if(!strcasecmp(argv[optind], "stop")) {
 541                 return send_ctl_request_cooked(fd, REQ_STOP, NULL, 0) != -1;
 542         }
 543
 544         if(!strcasecmp(argv[optind], "reload")) {
 545                 return send_ctl_request_cooked(fd, REQ_RELOAD, NULL, 0) != -1;
 546         }
 547
 548         if(!strcasecmp(argv[optind], "restart")) {
 549                 return send_ctl_request_cooked(fd, REQ_RESTART, NULL, 0) != -1;
 550         }
 551
 552         if(!strcasecmp(argv[optind], "dump")) {
 553                 if (argc < optind + 2) {
 554                         fprintf(stderr, _("Not enough arguments.\n"));
 555                         usage(true);
 556                         return 1;
 557                 }
 558
 559                 if(!strcasecmp(argv[optind+1], "nodes")) {
 560                         return send_ctl_request_cooked(fd, REQ_DUMP_NODES, NULL, 0) != -1;
 561                 }
 562
 563                 if(!strcasecmp(argv[optind+1], "edges")) {
 564                         return send_ctl_request_cooked(fd, REQ_DUMP_EDGES, NULL, 0) != -1;
 565                 }
 566
 567                 if(!strcasecmp(argv[optind+1], "subnets")) {
 568                         return send_ctl_request_cooked(fd, REQ_DUMP_SUBNETS, NULL, 0) != -1;
 569                 }
 570
 571                 if(!strcasecmp(argv[optind+1], "connections")) {
 572                         return send_ctl_request_cooked(fd, REQ_DUMP_CONNECTIONS, NULL, 0) != -1;
 573                 }
 574
 575                 if(!strcasecmp(argv[optind+1], "graph")) {
 576                         return send_ctl_request_cooked(fd, REQ_DUMP_GRAPH, NULL, 0) != -1;
 577                 }
 578
 579                 fprintf(stderr, _("Unknown dump type '%s'.\n"), argv[optind+1]);
 580                 usage(true);
 581                 return 1;
 582         }
 583
 584         if(!strcasecmp(argv[optind], "purge")) {
 585                 return send_ctl_request_cooked(fd, REQ_PURGE, NULL, 0) != -1;
 586         }
 587
 588         if(!strcasecmp(argv[optind], "debug")) {
 589                 int debuglevel;
 590
 591                 if(argc != optind + 2) {
 592                         fprintf(stderr, "Invalid arguments.\n");
 593                         return 1;
 594                 }
 595                 debuglevel = atoi(argv[optind+1]);
 596                 return send_ctl_request_cooked(fd, REQ_SET_DEBUG, &debuglevel,
 597                                                                            sizeof(debuglevel)) != -1;
 598         }
 599
 600         if(!strcasecmp(argv[optind], "retry")) {
 601                 return send_ctl_request_cooked(fd, REQ_RETRY, NULL, 0) != -1;
 602         }
 603
 604         fprintf(stderr, _("Unknown command `%s'.\n"), argv[optind]);
 605         usage(true);
 606
 607         close(fd);
 608
 609         return 0;
 610 }