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