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