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                                 "\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 /* This function prettyprints the key generation process */
 193
 194 static void indicator(int a, int b, void *p) {
 195         switch (a) {
 196                 case 0:
 197                         fprintf(stderr, ".");
 198                         break;
 199
 200                 case 1:
 201                         fprintf(stderr, "+");
 202                         break;
 203
 204                 case 2:
 205                         fprintf(stderr, "-");
 206                         break;
 207
 208                 case 3:
 209                         switch (b) {
 210                                 case 0:
 211                                         fprintf(stderr, " p\n");
 212                                         break;
 213
 214                                 case 1:
 215                                         fprintf(stderr, " q\n");
 216                                         break;
 217
 218                                 default:
 219                                         fprintf(stderr, "?");
 220                         }
 221                         break;
 222
 223                 default:
 224                         fprintf(stderr, "?");
 225         }
 226 }
 227
 228 /*
 229   Generate a public/private RSA keypair, and ask for a file to store
 230   them in.
 231 */
 232 static bool keygen(int bits) {
 233         RSA *rsa_key;
 234         FILE *f;
 235         char *name = NULL;
 236         char *filename;
 237
 238         fprintf(stderr, _("Generating %d bits keys:\n"), bits);
 239         rsa_key = RSA_generate_key(bits, 0x10001, indicator, NULL);
 240
 241         if(!rsa_key) {
 242                 fprintf(stderr, _("Error during key generation!\n"));
 243                 return false;
 244         } else
 245                 fprintf(stderr, _("Done.\n"));
 246
 247         asprintf(&filename, "%s/rsa_key.priv", confbase);
 248         f = ask_and_open(filename, _("private RSA key"), "a");
 249
 250         if(!f)
 251                 return false;
 252
 253 #ifdef HAVE_FCHMOD
 254         /* Make it unreadable for others. */
 255         fchmod(fileno(f), 0600);
 256 #endif
 257
 258         if(ftell(f))
 259                 fprintf(stderr, _("Appending key to existing contents.\nMake sure only one key is stored in the file.\n"));
 260
 261         PEM_write_RSAPrivateKey(f, rsa_key, NULL, NULL, 0, NULL, NULL);
 262         fclose(f);
 263         free(filename);
 264
 265         if(name)
 266                 asprintf(&filename, "%s/hosts/%s", confbase, name);
 267         else
 268                 asprintf(&filename, "%s/rsa_key.pub", confbase);
 269
 270         f = ask_and_open(filename, _("public RSA key"), "a");
 271
 272         if(!f)
 273                 return false;
 274
 275         if(ftell(f))
 276                 fprintf(stderr, _("Appending key to existing contents.\nMake sure only one key is stored in the file.\n"));
 277
 278         PEM_write_RSAPublicKey(f, rsa_key);
 279         fclose(f);
 280         free(filename);
 281
 282         return true;
 283 }
 284
 285 /*
 286   Set all files and paths according to netname
 287 */
 288 static void make_names(void) {
 289 #ifdef HAVE_MINGW
 290         HKEY key;
 291         char installdir[1024] = "";
 292         long len = sizeof(installdir);
 293 #endif
 294
 295         if(netname)
 296                 asprintf(&identname, "tinc.%s", netname);
 297         else
 298                 identname = xstrdup("tinc");
 299
 300 #ifdef HAVE_MINGW
 301         if(!RegOpenKeyEx(HKEY_LOCAL_MACHINE, "SOFTWARE\\tinc", 0, KEY_READ, &key)) {
 302                 if(!RegQueryValueEx(key, NULL, 0, 0, installdir, &len)) {
 303                         if(!logfilename)
 304                                 asprintf(&logfilename, "%s/log/%s.log", identname);
 305                         if(!confbase) {
 306                                 if(netname)
 307                                         asprintf(&confbase, "%s/%s", installdir, netname);
 308                                 else
 309                                         asprintf(&confbase, "%s", installdir);
 310                         }
 311                 }
 312                 RegCloseKey(key);
 313                 if(*installdir)
 314                         return;
 315         }
 316 #endif
 317
 318         if(!controlsocketname)
 319                 asprintf(&controlsocketname, LOCALSTATEDIR "/run/%s.control", identname);
 320
 321         if(netname) {
 322                 if(!confbase)
 323                         asprintf(&confbase, CONFDIR "/tinc/%s", netname);
 324                 else
 325                         fprintf(stderr, _("Both netname and configuration directory given, using the latter...\n"));
 326         } else {
 327                 if(!confbase)
 328                         asprintf(&confbase, CONFDIR "/tinc");
 329         }
 330 }
 331
 332 static int fullread(int fd, void *data, size_t datalen) {
 333         int rv, len = 0;
 334
 335         while (len < datalen) {
 336                 rv = read(fd, data + len, datalen - len);
 337                 if(rv == -1 && errno == EINTR)
 338                         continue;
 339                 else if (rv == -1)
 340                         return rv;
 341                 else if (rv == 0) {
 342                         errno = ENODATA;
 343                         return -1;
 344                 }
 345                 len += rv;
 346         }
 347         return 0;
 348 }
 349
 350 /*
 351    Send a request (raw)
 352 */
 353 static int send_ctl_request(int fd, enum request_type type,
 354                                                    void const *outdata, size_t outdatalen,
 355                                                    int *res_errno_p, void **indata_p,
 356                                                    size_t *indatalen_p) {
 357         tinc_ctl_request_t req;
 358         int rv;
 359         struct iovec vector[2] = {
 360                 {&req, sizeof(req)},
 361                 {(void*) outdata, outdatalen}
 362         };
 363         void *indata;
 364
 365         if(res_errno_p == NULL)
 366                 return -1;
 367
 368         memset(&req, 0, sizeof req);
 369         req.length = sizeof req + outdatalen;
 370         req.type = type;
 371         req.res_errno = 0;
 372
 373         while((rv = writev(fd, vector, 2)) == -1 && errno == EINTR) ;
 374         if(rv != req.length)
 375                 return -1;
 376
 377         if(fullread(fd, &req, sizeof req) == -1)
 378                 return -1;
 379
 380         if(req.length < sizeof req) {
 381                 errno = EINVAL;
 382                 return -1;
 383         }
 384
 385         if(req.length > sizeof req) {
 386                 if (indata_p == NULL) {
 387                         errno = EINVAL;
 388                         return -1;
 389                 }
 390
 391                 indata = xmalloc(req.length - sizeof req);
 392
 393                 if(fullread(fd, indata, req.length - sizeof req) == -1) {
 394                         free(indata);
 395                         return -1;
 396                 }
 397
 398                 *indata_p = indata;
 399                 if(indatalen_p != NULL)
 400                         *indatalen_p = req.length - sizeof req;
 401         }
 402
 403         *res_errno_p = req.res_errno;
 404
 405         return 0;
 406 }
 407
 408 /*
 409    Send a request (with printfs)
 410 */
 411 static int send_ctl_request_cooked(int fd, enum request_type type,
 412                                                                    void const *outdata, size_t outdatalen)
 413 {
 414         int res_errno = -1;
 415         char *buf = NULL;
 416         size_t buflen = 0;
 417
 418         if(send_ctl_request(fd, type, outdata, outdatalen, &res_errno,
 419                                                 (void**) &buf, &buflen)) {
 420                 fprintf(stderr, _("Error sending request: %s\n"), strerror(errno));
 421                 return -1;
 422         }
 423
 424         if(buf != NULL) {
 425                 printf("%*s", buflen, buf);
 426                 free(buf);
 427         }
 428
 429         if(res_errno != 0) {
 430                 fprintf(stderr, _("Server reported error: %s\n"), strerror(res_errno));
 431                 return -1;
 432         }
 433
 434         return 0;
 435 }
 436
 437 int main(int argc, char *argv[], char *envp[]) {
 438         struct sockaddr_un addr;
 439         int fd;
 440         int len;
 441         tinc_ctl_greeting_t greeting;
 442         tinc_ctl_request_t req;
 443
 444         program_name = argv[0];
 445
 446         setlocale(LC_ALL, "");
 447         bindtextdomain(PACKAGE, LOCALEDIR);
 448         textdomain(PACKAGE);
 449
 450         if(!parse_options(argc, argv))
 451                 return 1;
 452
 453         make_names();
 454
 455         if(show_version) {
 456                 printf(_("%s version %s (built %s %s, protocol %d)\n"), PACKAGE,
 457                            VERSION, __DATE__, __TIME__, PROT_CURRENT);
 458                 printf(_("Copyright (C) 1998-2007 Ivo Timmermans, Guus Sliepen and others.\n"
 459                                 "See the AUTHORS file for a complete list.\n\n"
 460                                 "tinc comes with ABSOLUTELY NO WARRANTY.  This is free software,\n"
 461                                 "and you are welcome to redistribute it under certain conditions;\n"
 462                                 "see the file COPYING for details.\n"));
 463
 464                 return 0;
 465         }
 466
 467         if(show_help) {
 468                 usage(false);
 469                 return 0;
 470         }
 471
 472         if(optind >= argc) {
 473                 fprintf(stderr, _("Not enough arguments.\n"));
 474                 usage(true);
 475                 return 1;
 476         }
 477
 478         // First handle commands that don't involve connecting to a running tinc daemon.
 479
 480         if(!strcasecmp(argv[optind], "generate-keys")) {
 481                 return !keygen(optind > argc ? atoi(argv[optind + 1]) : 1024);
 482         }
 483
 484         if(!strcasecmp(argv[optind], "start")) {
 485                 argv[optind] = NULL;
 486                 execve("tincd", argv, envp);
 487                 fprintf(stderr, _("Could not start tincd: %s"), strerror(errno));
 488                 return 1;
 489         }
 490
 491         // Now handle commands that do involve connecting to a running tinc daemon.
 492
 493         if(strlen(controlsocketname) >= sizeof addr.sun_path) {
 494                 fprintf(stderr, _("Control socket filename too long!\n"));
 495                 return 1;
 496         }
 497
 498         fd = socket(PF_UNIX, SOCK_STREAM, 0);
 499         if(fd < 0) {
 500                 fprintf(stderr, _("Cannot create UNIX socket: %s\n"), strerror(errno));
 501                 return 1;
 502         }
 503
 504         memset(&addr, 0, sizeof addr);
 505         addr.sun_family = AF_UNIX;
 506         strncpy(addr.sun_path, controlsocketname, sizeof addr.sun_path - 1);
 507
 508         if(connect(fd, (struct sockaddr *)&addr, sizeof addr) < 0) {
 509                 fprintf(stderr, _("Cannot connect to %s: %s\n"), controlsocketname, strerror(errno));
 510                 return 1;
 511         }
 512
 513         if(fullread(fd, &greeting, sizeof greeting) == -1) {
 514                 fprintf(stderr, _("Cannot read greeting from control socket: %s\n"),
 515                                 strerror(errno));
 516                 return 1;
 517         }
 518
 519         if(greeting.version != TINC_CTL_VERSION_CURRENT) {
 520                 fprintf(stderr, _("Version mismatch: server %d, client %d\n"),
 521                                 greeting.version, TINC_CTL_VERSION_CURRENT);
 522                 return 1;
 523         }
 524
 525         struct ucred cred;
 526         socklen_t credlen = sizeof cred;
 527
 528         if(getsockopt(fd, SOL_SOCKET, SO_PEERCRED, &cred, &credlen) < 0) {
 529                 fprintf(stderr, _("Could not obtain PID: %s\n"), strerror(errno));
 530                 return 1;
 531         }
 532
 533         if(!strcasecmp(argv[optind], "pid")) {
 534                 printf("%d\n", cred.pid);
 535                 return 0;
 536         }
 537
 538         if(!strcasecmp(argv[optind], "stop")) {
 539                 return send_ctl_request_cooked(fd, REQ_STOP, NULL, 0) != -1;
 540         }
 541
 542         if(!strcasecmp(argv[optind], "reload")) {
 543                 return send_ctl_request_cooked(fd, REQ_RELOAD, NULL, 0) != -1;
 544         }
 545
 546         if(!strcasecmp(argv[optind], "restart")) {
 547                 return send_ctl_request_cooked(fd, REQ_RESTART, NULL, 0) != -1;
 548         }
 549
 550         if(!strcasecmp(argv[optind], "dump")) {
 551                 if (argc < optind + 2) {
 552                         fprintf(stderr, _("Not enough arguments.\n"));
 553                         usage(true);
 554                         return 1;
 555                 }
 556
 557                 if(!strcasecmp(argv[optind+1], "nodes")) {
 558                         return send_ctl_request_cooked(fd, REQ_DUMP_NODES, NULL, 0) != -1;
 559                 }
 560
 561                 if(!strcasecmp(argv[optind+1], "edges")) {
 562                         return send_ctl_request_cooked(fd, REQ_DUMP_EDGES, NULL, 0) != -1;
 563                 }
 564
 565                 if(!strcasecmp(argv[optind+1], "subnets")) {
 566                         return send_ctl_request_cooked(fd, REQ_DUMP_SUBNETS, NULL, 0) != -1;
 567                 }
 568
 569                 if(!strcasecmp(argv[optind+1], "connections")) {
 570                         return send_ctl_request_cooked(fd, REQ_DUMP_CONNECTIONS, NULL, 0) != -1;
 571                 }
 572
 573                 if(!strcasecmp(argv[optind+1], "graph")) {
 574                         return send_ctl_request_cooked(fd, REQ_DUMP_GRAPH, NULL, 0) != -1;
 575                 }
 576
 577                 fprintf(stderr, _("Unknown dump type '%s'.\n"), argv[optind+1]);
 578                 usage(true);
 579                 return 1;
 580         }
 581
 582         if(!strcasecmp(argv[optind], "purge")) {
 583                 return send_ctl_request_cooked(fd, REQ_PURGE, NULL, 0) != -1;
 584         }
 585
 586         fprintf(stderr, _("Unknown command `%s'.\n"), argv[optind]);
 587         usage(true);
 588
 589         close(fd);
 590
 591         return 0;
 592 }