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

   1 /*
   2     tincctl.c -- Controlling a running tincd
   3     Copyright (C) 2007-2009 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 along
  16     with this program; if not, write to the Free Software Foundation, Inc.,
  17     51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  18 */
  19
  20 #include "system.h"
  21
  22 #include <getopt.h>
  23
  24 #include "xalloc.h"
  25 #include "protocol.h"
  26 #include "control_common.h"
  27 #include "rsagen.h"
  28 #include "utils.h"
  29
  30 /* The name this program was run with. */
  31 char *program_name = NULL;
  32
  33 /* If nonzero, display usage information and exit. */
  34 bool show_help = false;
  35
  36 /* If nonzero, print the version on standard output and exit.  */
  37 bool show_version = false;
  38
  39 /* If nonzero, it will attempt to kill a running tincd and exit. */
  40 int kill_tincd = 0;
  41
  42 /* If nonzero, generate public/private keypair for this host/net. */
  43 int generate_keys = 0;
  44
  45 static char *identname = NULL;                          /* program name for syslog */
  46 static char *controlsocketname = NULL;                  /* pid file location */
  47 char *netname = NULL;
  48 char *confbase = NULL;
  49
  50 #ifdef HAVE_MINGW
  51 static struct WSAData wsa_state;
  52 #endif
  53
  54 static struct option const long_options[] = {
  55         {"config", required_argument, NULL, 'c'},
  56         {"net", required_argument, NULL, 'n'},
  57         {"help", no_argument, NULL, 1},
  58         {"version", no_argument, NULL, 2},
  59         {"controlsocket", required_argument, NULL, 5},
  60         {NULL, 0, NULL, 0}
  61 };
  62
  63 static void usage(bool status) {
  64         if(status)
  65                 fprintf(stderr, "Try `%s --help\' for more information.\n",
  66                                 program_name);
  67         else {
  68                 printf("Usage: %s [options] command\n\n", program_name);
  69                 printf("Valid options are:\n"
  70                                 "  -c, --config=DIR              Read configuration options from DIR.\n"
  71                                 "  -n, --net=NETNAME             Connect to net NETNAME.\n"
  72                                 "      --controlsocket=FILENAME  Open control socket at FILENAME.\n"
  73                                 "      --help                    Display this help and exit.\n"
  74                                 "      --version                 Output version information and exit.\n"
  75                                 "\n"
  76                                 "Valid commands are:\n"
  77                                 "  start                      Start tincd.\n"
  78                                 "  stop                       Stop tincd.\n"
  79                                 "  restart                    Restart tincd.\n"
  80                                 "  reload                     Reload configuration of running tincd.\n"
  81                                 "  pid                        Show PID of currently running tincd.\n"
  82                                 "  generate-keys [bits]       Generate a new public/private keypair.\n"
  83                                 "  dump                       Dump a list of one of the following things:\n"
  84                                 "    nodes                    - all known nodes in the VPN\n"
  85                                 "    edges                    - all known connections in the VPN\n"
  86                                 "    subnets                  - all known subnets in the VPN\n"
  87                                 "    connections              - all meta connections with ourself\n"
  88                                 "    graph                    - graph of the VPN in dotty format\n"
  89                                 "  purge                      Purge unreachable nodes\n"
  90                                 "  debug N                    Set debug level\n"
  91                                 "  retry                      Retry all outgoing connections\n"
  92                                 "  reload                     Partial reload of configuration\n"
  93                                 "\n");
  94                 printf("Report bugs to tinc@tinc-vpn.org.\n");
  95         }
  96 }
  97
  98 static bool parse_options(int argc, char **argv) {
  99         int r;
 100         int option_index = 0;
 101
 102         while((r = getopt_long(argc, argv, "c:n:", long_options, &option_index)) != EOF) {
 103                 switch (r) {
 104                         case 0:                         /* long option */
 105                                 break;
 106
 107                         case 'c':                               /* config file */
 108                                 confbase = xstrdup(optarg);
 109                                 break;
 110
 111                         case 'n':                               /* net name given */
 112                                 netname = xstrdup(optarg);
 113                                 break;
 114
 115                         case 1:                                 /* show help */
 116                                 show_help = true;
 117                                 break;
 118
 119                         case 2:                                 /* show version */
 120                                 show_version = true;
 121                                 break;
 122
 123                         case 5:                                 /* open control socket here */
 124                                 controlsocketname = xstrdup(optarg);
 125                                 break;
 126
 127                         case '?':
 128                                 usage(true);
 129                                 return false;
 130
 131                         default:
 132                                 break;
 133                 }
 134         }
 135
 136         return true;
 137 }
 138
 139 FILE *ask_and_open(const char *filename, const char *what, const char *mode) {
 140         FILE *r;
 141         char *directory;
 142         char buf[PATH_MAX];
 143         char buf2[PATH_MAX];
 144         size_t len;
 145
 146         /* Check stdin and stdout */
 147         if(isatty(0) && isatty(1)) {
 148                 /* Ask for a file and/or directory name. */
 149                 fprintf(stdout, "Please enter a file to save %s to [%s]: ",
 150                                 what, filename);
 151                 fflush(stdout);
 152
 153                 if(fgets(buf, sizeof buf, stdin) < 0) {
 154                         fprintf(stderr, "Error while reading stdin: %s\n",
 155                                         strerror(errno));
 156                         return NULL;
 157                 }
 158
 159                 len = strlen(buf);
 160                 if(len)
 161                         buf[--len] = 0;
 162
 163                 if(len)
 164                         filename = buf;
 165         }
 166
 167 #ifdef HAVE_MINGW
 168         if(filename[0] != '\\' && filename[0] != '/' && !strchr(filename, ':')) {
 169 #else
 170         if(filename[0] != '/') {
 171 #endif
 172                 /* The directory is a relative path or a filename. */
 173                 directory = get_current_dir_name();
 174                 snprintf(buf2, sizeof buf2, "%s/%s", directory, filename);
 175                 filename = buf2;
 176         }
 177
 178         umask(0077);                            /* Disallow everything for group and other */
 179
 180         /* Open it first to keep the inode busy */
 181
 182         r = fopen(filename, mode);
 183
 184         if(!r) {
 185                 fprintf(stderr, "Error opening file `%s': %s\n", filename, strerror(errno));
 186                 return NULL;
 187         }
 188
 189         return r;
 190 }
 191
 192 /*
 193   Generate a public/private RSA keypair, and ask for a file to store
 194   them in.
 195 */
 196 static bool keygen(int bits) {
 197         rsa_t key;
 198         FILE *f;
 199         char *name = NULL;
 200         char *filename;
 201
 202         fprintf(stderr, "Generating %d bits keys:\n", bits);
 203
 204         if(!rsa_generate(&key, bits, 0x10001)) {
 205                 fprintf(stderr, "Error during key generation!\n");
 206                 return false;
 207         } else
 208                 fprintf(stderr, "Done.\n");
 209
 210         xasprintf(&filename, "%s/rsa_key.priv", confbase);
 211         f = ask_and_open(filename, "private RSA key", "a");
 212
 213         if(!f)
 214                 return false;
 215
 216 #ifdef HAVE_FCHMOD
 217         /* Make it unreadable for others. */
 218         fchmod(fileno(f), 0600);
 219 #endif
 220
 221         if(ftell(f))
 222                 fprintf(stderr, "Appending key to existing contents.\nMake sure only one key is stored in the file.\n");
 223
 224         rsa_write_pem_private_key(&key, f);
 225
 226         fclose(f);
 227         free(filename);
 228
 229         if(name)
 230                 xasprintf(&filename, "%s/hosts/%s", confbase, name);
 231         else
 232                 xasprintf(&filename, "%s/rsa_key.pub", confbase);
 233
 234         f = ask_and_open(filename, "public RSA key", "a");
 235
 236         if(!f)
 237                 return false;
 238
 239         if(ftell(f))
 240                 fprintf(stderr, "Appending key to existing contents.\nMake sure only one key is stored in the file.\n");
 241
 242         rsa_write_pem_public_key(&key, f);
 243
 244         fclose(f);
 245         free(filename);
 246
 247         return true;
 248 }
 249
 250 /*
 251   Set all files and paths according to netname
 252 */
 253 static void make_names(void) {
 254 #ifdef HAVE_MINGW
 255         HKEY key;
 256         char installdir[1024] = "";
 257         long len = sizeof installdir;
 258 #endif
 259
 260         if(netname)
 261                 xasprintf(&identname, "tinc.%s", netname);
 262         else
 263                 identname = xstrdup("tinc");
 264
 265 #ifdef HAVE_MINGW
 266         if(!RegOpenKeyEx(HKEY_LOCAL_MACHINE, "SOFTWARE\\tinc", 0, KEY_READ, &key)) {
 267                 if(!RegQueryValueEx(key, NULL, 0, 0, installdir, &len)) {
 268                         if(!confbase) {
 269                                 if(netname)
 270                                         xasprintf(&confbase, "%s/%s", installdir, netname);
 271                                 else
 272                                         xasprintf(&confbase, "%s", installdir);
 273                         }
 274                 }
 275                 RegCloseKey(key);
 276                 if(*installdir)
 277                         return;
 278         }
 279 #endif
 280
 281         if(!controlsocketname)
 282                 xasprintf(&controlsocketname, "%s/run/%s.control/socket", LOCALSTATEDIR, identname);
 283
 284         if(netname) {
 285                 if(!confbase)
 286                         xasprintf(&confbase, CONFDIR "/tinc/%s", netname);
 287                 else
 288                         fprintf(stderr, "Both netname and configuration directory given, using the latter...\n");
 289         } else {
 290                 if(!confbase)
 291                         xasprintf(&confbase, CONFDIR "/tinc");
 292         }
 293 }
 294
 295 static int fullread(int fd, void *data, size_t datalen) {
 296         int rv, len = 0;
 297
 298         while(len < datalen) {
 299                 rv = read(fd, data + len, datalen - len);
 300                 if(rv == -1 && errno == EINTR)
 301                         continue;
 302                 else if(rv == -1)
 303                         return rv;
 304                 else if(rv == 0) {
 305 #ifdef HAVE_MINGW
 306                         errno = 0;
 307 #else
 308                         errno = ENODATA;
 309 #endif
 310                         return -1;
 311                 }
 312                 len += rv;
 313         }
 314         return 0;
 315 }
 316
 317 /*
 318    Send a request (raw)
 319 */
 320 static int send_ctl_request(int fd, enum request_type type,
 321                                                    void const *outdata, size_t outdatalen,
 322                                                    int *res_errno_p, void **indata_p,
 323                                                    size_t *indatalen_p) {
 324         tinc_ctl_request_t req;
 325         int rv;
 326         void *indata;
 327
 328         memset(&req, 0, sizeof req);
 329         req.length = sizeof req + outdatalen;
 330         req.type = type;
 331         req.res_errno = 0;
 332
 333 #ifdef HAVE_MINGW
 334         if(send(fd, (void *)&req, sizeof req, 0) != sizeof req || send(fd, outdata, outdatalen, 0) != outdatalen)
 335                 return -1;
 336 #else
 337         struct iovec vector[2] = {
 338                 {&req, sizeof req},
 339                 {(void*) outdata, outdatalen}
 340         };
 341
 342         if(res_errno_p == NULL)
 343                 return -1;
 344
 345         while((rv = writev(fd, vector, 2)) == -1 && errno == EINTR) ;
 346         if(rv != req.length)
 347                 return -1;
 348 #endif
 349
 350         if(fullread(fd, &req, sizeof req) == -1)
 351                 return -1;
 352
 353         if(req.length < sizeof req) {
 354                 errno = EINVAL;
 355                 return -1;
 356         }
 357
 358         if(req.length > sizeof req) {
 359                 if(indata_p == NULL) {
 360                         errno = EINVAL;
 361                         return -1;
 362                 }
 363
 364                 indata = xmalloc(req.length - sizeof req);
 365
 366                 if(fullread(fd, indata, req.length - sizeof req) == -1) {
 367                         free(indata);
 368                         return -1;
 369                 }
 370
 371                 *indata_p = indata;
 372                 if(indatalen_p != NULL)
 373                         *indatalen_p = req.length - sizeof req;
 374         }
 375
 376         *res_errno_p = req.res_errno;
 377
 378         return 0;
 379 }
 380
 381 /*
 382    Send a request (with printfs)
 383 */
 384 static int send_ctl_request_cooked(int fd, enum request_type type, void const *outdata, size_t outdatalen) {
 385         int res_errno = -1;
 386         char *buf = NULL;
 387         size_t buflen = 0;
 388
 389         if(send_ctl_request(fd, type, outdata, outdatalen, &res_errno,
 390                                                 (void**) &buf, &buflen)) {
 391                 fprintf(stderr, "Error sending request: %s\n", strerror(errno));
 392                 return -1;
 393         }
 394
 395         if(buf != NULL) {
 396                 printf("%*s", (int)buflen, buf);
 397                 free(buf);
 398         }
 399
 400         if(res_errno != 0) {
 401                 fprintf(stderr, "Server reported error: %s\n", strerror(res_errno));
 402                 return -1;
 403         }
 404
 405         return 0;
 406 }
 407
 408 int main(int argc, char *argv[], char *envp[]) {
 409         tinc_ctl_greeting_t greeting;
 410         int fd;
 411         int result;
 412
 413         program_name = argv[0];
 414
 415         if(!parse_options(argc, argv))
 416                 return 1;
 417
 418         make_names();
 419
 420         if(show_version) {
 421                 printf("%s version %s (built %s %s, protocol %d)\n", PACKAGE,
 422                            VERSION, __DATE__, __TIME__, PROT_CURRENT);
 423                 printf("Copyright (C) 1998-2009 Ivo Timmermans, Guus Sliepen and others.\n"
 424                                 "See the AUTHORS file for a complete list.\n\n"
 425                                 "tinc comes with ABSOLUTELY NO WARRANTY.  This is free software,\n"
 426                                 "and you are welcome to redistribute it under certain conditions;\n"
 427                                 "see the file COPYING for details.\n");
 428
 429                 return 0;
 430         }
 431
 432         if(show_help) {
 433                 usage(false);
 434                 return 0;
 435         }
 436
 437         if(optind >= argc) {
 438                 fprintf(stderr, "Not enough arguments.\n");
 439                 usage(true);
 440                 return 1;
 441         }
 442
 443         // First handle commands that don't involve connecting to a running tinc daemon.
 444
 445         if(!strcasecmp(argv[optind], "generate-keys")) {
 446                 return !keygen(optind > argc ? atoi(argv[optind + 1]) : 2048);
 447         }
 448
 449         if(!strcasecmp(argv[optind], "start")) {
 450                 argv[optind] = NULL;
 451                 execve(SBINDIR "/tincd", argv, envp);
 452                 fprintf(stderr, "Could not start tincd: %s", strerror(errno));
 453                 return 1;
 454         }
 455
 456         /*
 457          * Now handle commands that do involve connecting to a running tinc daemon.
 458          * Authenticate the server by ensuring the parent directory can be
 459          * traversed only by root. Note this is not totally race-free unless all
 460          * ancestors are writable only by trusted users, which we don't verify.
 461          */
 462
 463 #ifdef HAVE_MINGW
 464         if(WSAStartup(MAKEWORD(2, 2), &wsa_state)) {
 465                 fprintf(stderr, "System call `%s' failed: %s", "WSAStartup", winerror(GetLastError()));
 466                 return 1;
 467         }
 468
 469         struct sockaddr_in addr;
 470         memset(&addr, 0, sizeof addr);
 471         addr.sin_family = AF_INET;
 472         addr.sin_addr.s_addr = htonl(0x7f000001);
 473         addr.sin_port = htons(55555);
 474
 475         fd = socket(PF_INET, SOCK_STREAM, IPPROTO_TCP);
 476         if(fd < 0) {
 477                 fprintf(stderr, "Cannot create TCP socket: %s\n", sockstrerror(sockerrno));
 478                 return 1;
 479         }
 480
 481         fprintf(stderr, "Got socket %d\n", fd);
 482
 483         unsigned long arg = 0;
 484
 485         if(ioctlsocket(fd, FIONBIO, &arg) != 0) {
 486                 fprintf(stderr, "ioctlsocket failed: %s", sockstrerror(sockerrno));
 487         }
 488 #else
 489         struct sockaddr_un addr;
 490         struct stat statbuf;
 491         char *lastslash = strrchr(controlsocketname, '/');
 492         if(lastslash != NULL) {
 493                 /* control socket is not in cwd; stat its parent */
 494                 *lastslash = 0;
 495                 result = stat(controlsocketname, &statbuf);
 496                 *lastslash = '/';
 497         } else
 498                 result = stat(".", &statbuf);
 499
 500         if(result < 0) {
 501                 fprintf(stderr, "Unable to check control socket directory permissions: %s\n", strerror(errno));
 502                 return 1;
 503         }
 504
 505         if(statbuf.st_uid != 0 || (statbuf.st_mode & S_IXOTH) != 0 || (statbuf.st_gid != 0 && (statbuf.st_mode & S_IXGRP)) != 0) {
 506                 fprintf(stderr, "Insecure permissions on control socket directory\n");
 507                 return 1;
 508         }
 509
 510         if(strlen(controlsocketname) >= sizeof addr.sun_path) {
 511                 fprintf(stderr, "Control socket filename too long!\n");
 512                 return 1;
 513         }
 514
 515         fd = socket(PF_UNIX, SOCK_STREAM, 0);
 516         if(fd < 0) {
 517                 fprintf(stderr, "Cannot create UNIX socket: %s\n", strerror(errno));
 518                 return 1;
 519         }
 520
 521         memset(&addr, 0, sizeof addr);
 522         addr.sun_family = AF_UNIX;
 523         strncpy(addr.sun_path, controlsocketname, sizeof addr.sun_path - 1);
 524 #endif
 525
 526         if(connect(fd, (struct sockaddr *)&addr, sizeof addr) < 0) {
 527
 528                 fprintf(stderr, "Cannot connect to %s: %s\n", controlsocketname, sockstrerror(sockerrno));
 529                 return 1;
 530         }
 531
 532         fprintf(stderr, "Connected!\n");
 533
 534         if(fullread(fd, &greeting, sizeof greeting) == -1) {
 535                 fprintf(stderr, "Cannot read greeting from control socket: %s\n",
 536                                 sockstrerror(sockerrno));
 537                 return 1;
 538         }
 539
 540         if(greeting.version != TINC_CTL_VERSION_CURRENT) {
 541                 fprintf(stderr, "Version mismatch: server %d, client %d\n",
 542                                 greeting.version, TINC_CTL_VERSION_CURRENT);
 543                 return 1;
 544         }
 545
 546         if(!strcasecmp(argv[optind], "pid")) {
 547                 printf("%d\n", greeting.pid);
 548                 return 0;
 549         }
 550
 551         if(!strcasecmp(argv[optind], "stop")) {
 552                 return send_ctl_request_cooked(fd, REQ_STOP, NULL, 0) != -1;
 553         }
 554
 555         if(!strcasecmp(argv[optind], "reload")) {
 556                 return send_ctl_request_cooked(fd, REQ_RELOAD, NULL, 0) != -1;
 557         }
 558
 559         if(!strcasecmp(argv[optind], "restart")) {
 560                 return send_ctl_request_cooked(fd, REQ_RESTART, NULL, 0) != -1;
 561         }
 562
 563         if(!strcasecmp(argv[optind], "dump")) {
 564                 if(argc < optind + 2) {
 565                         fprintf(stderr, "Not enough arguments.\n");
 566                         usage(true);
 567                         return 1;
 568                 }
 569
 570                 if(!strcasecmp(argv[optind+1], "nodes")) {
 571                         return send_ctl_request_cooked(fd, REQ_DUMP_NODES, NULL, 0) != -1;
 572                 }
 573
 574                 if(!strcasecmp(argv[optind+1], "edges")) {
 575                         return send_ctl_request_cooked(fd, REQ_DUMP_EDGES, NULL, 0) != -1;
 576                 }
 577
 578                 if(!strcasecmp(argv[optind+1], "subnets")) {
 579                         return send_ctl_request_cooked(fd, REQ_DUMP_SUBNETS, NULL, 0) != -1;
 580                 }
 581
 582                 if(!strcasecmp(argv[optind+1], "connections")) {
 583                         return send_ctl_request_cooked(fd, REQ_DUMP_CONNECTIONS, NULL, 0) != -1;
 584                 }
 585
 586                 if(!strcasecmp(argv[optind+1], "graph")) {
 587                         return send_ctl_request_cooked(fd, REQ_DUMP_GRAPH, NULL, 0) != -1;
 588                 }
 589
 590                 fprintf(stderr, "Unknown dump type '%s'.\n", argv[optind+1]);
 591                 usage(true);
 592                 return 1;
 593         }
 594
 595         if(!strcasecmp(argv[optind], "purge")) {
 596                 return send_ctl_request_cooked(fd, REQ_PURGE, NULL, 0) != -1;
 597         }
 598
 599         if(!strcasecmp(argv[optind], "debug")) {
 600                 int debuglevel;
 601
 602                 if(argc != optind + 2) {
 603                         fprintf(stderr, "Invalid arguments.\n");
 604                         return 1;
 605                 }
 606                 debuglevel = atoi(argv[optind+1]);
 607                 return send_ctl_request_cooked(fd, REQ_SET_DEBUG, &debuglevel,
 608                                                                            sizeof debuglevel) != -1;
 609         }
 610
 611         if(!strcasecmp(argv[optind], "retry")) {
 612                 return send_ctl_request_cooked(fd, REQ_RETRY, NULL, 0) != -1;
 613         }
 614
 615         if(!strcasecmp(argv[optind], "reload")) {
 616                 return send_ctl_request_cooked(fd, REQ_RELOAD, NULL, 0) != -1;
 617         }
 618
 619         fprintf(stderr, "Unknown command `%s'.\n", argv[optind]);
 620         usage(true);
 621
 622         close(fd);
 623
 624         return 0;
 625 }