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

   1 /*
   2     tincctl.c -- Controlling a running tincd
   3     Copyright (C) 2007-2012 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 #ifdef HAVE_READLINE
  25 #include "readline/readline.h"
  26 #include "readline/history.h"
  27 #endif
  28
  29 #include "xalloc.h"
  30 #include "protocol.h"
  31 #include "control_common.h"
  32 #include "ecdsagen.h"
  33 #include "info.h"
  34 #include "rsagen.h"
  35 #include "utils.h"
  36 #include "tincctl.h"
  37 #include "top.h"
  38
  39 #ifdef HAVE_MINGW
  40 #define mkdir(a, b) mkdir(a)
  41 #endif
  42
  43
  44 /* The name this program was run with. */
  45 static char *program_name = NULL;
  46
  47 static char **orig_argv;
  48 static int orig_argc;
  49
  50 /* If nonzero, display usage information and exit. */
  51 static bool show_help = false;
  52
  53 /* If nonzero, print the version on standard output and exit.  */
  54 static bool show_version = false;
  55
  56 static char *name = NULL;
  57 static char *identname = NULL;                          /* program name for syslog */
  58 static char *pidfilename = NULL;                        /* pid file location */
  59 static char *confdir = NULL;
  60 static char controlcookie[1024];
  61 char *netname = NULL;
  62 char *confbase = NULL;
  63 static char *tinc_conf = NULL;
  64 static char *hosts_dir = NULL;
  65
  66 // Horrible global variables...
  67 static int pid = 0;
  68 static int fd = -1;
  69 static char line[4096];
  70 static int code;
  71 static int req;
  72 static int result;
  73 static bool force = false;
  74 static bool tty = true;
  75
  76 #ifdef HAVE_MINGW
  77 static struct WSAData wsa_state;
  78 #endif
  79
  80 static struct option const long_options[] = {
  81         {"config", required_argument, NULL, 'c'},
  82         {"debug", optional_argument, NULL, 0},
  83         {"no-detach", no_argument, NULL, 0},
  84         {"mlock", no_argument, NULL, 0},
  85         {"net", required_argument, NULL, 'n'},
  86         {"help", no_argument, NULL, 1},
  87         {"version", no_argument, NULL, 2},
  88         {"pidfile", required_argument, NULL, 5},
  89         {"logfile", required_argument, NULL, 0},
  90         {"bypass-security", no_argument, NULL, 0},
  91         {"chroot", no_argument, NULL, 0},
  92         {"user", required_argument, NULL, 0},
  93         {"option", required_argument, NULL, 0},
  94         {"force", no_argument, NULL, 6},
  95         {NULL, 0, NULL, 0}
  96 };
  97
  98 static void version(void) {
  99         printf("%s version %s (built %s %s, protocol %d.%d)\n", PACKAGE,
 100                    VERSION, __DATE__, __TIME__, PROT_MAJOR, PROT_MINOR);
 101         printf("Copyright (C) 1998-2012 Ivo Timmermans, Guus Sliepen and others.\n"
 102                         "See the AUTHORS file for a complete list.\n\n"
 103                         "tinc comes with ABSOLUTELY NO WARRANTY.  This is free software,\n"
 104                         "and you are welcome to redistribute it under certain conditions;\n"
 105                         "see the file COPYING for details.\n");
 106 }
 107
 108 static void usage(bool status) {
 109         if(status)
 110                 fprintf(stderr, "Try `%s --help\' for more information.\n",
 111                                 program_name);
 112         else {
 113                 printf("Usage: %s [options] command\n\n", program_name);
 114                 printf("Valid options are:\n"
 115                                 "  -c, --config=DIR        Read configuration options from DIR.\n"
 116                                 "  -n, --net=NETNAME       Connect to net NETNAME.\n"
 117                                 "      --pidfile=FILENAME  Read control cookie from FILENAME.\n"
 118                                 "      --help              Display this help and exit.\n"
 119                                 "      --version           Output version information and exit.\n"
 120                                 "\n"
 121                                 "Valid commands are:\n"
 122                                 "  init [name]                Create initial configuration files.\n"
 123                                 "  config                     Change configuration:\n"
 124                                 "    [get] VARIABLE           - print current value of VARIABLE\n"
 125                                 "    [set] VARIABLE VALUE     - set VARIABLE to VALUE\n"
 126                                 "    add VARIABLE VALUE       - add VARIABLE with the given VALUE\n"
 127                                 "    del VARIABLE [VALUE]     - remove VARIABLE [only ones with watching VALUE]\n"
 128                                 "  start [tincd options]      Start tincd.\n"
 129                                 "  stop                       Stop tincd.\n"
 130                                 "  restart                    Restart tincd.\n"
 131                                 "  reload                     Partially reload configuration of running tincd.\n"
 132                                 "  pid                        Show PID of currently running tincd.\n"
 133                                 "  generate-keys [bits]       Generate new RSA and ECDSA public/private keypairs.\n"
 134                                 "  generate-rsa-keys [bits]   Generate a new RSA public/private keypair.\n"
 135                                 "  generate-ecdsa-keys        Generate a new ECDSA public/private keypair.\n"
 136                                 "  dump                       Dump a list of one of the following things:\n"
 137                                 "    nodes                    - all known nodes in the VPN\n"
 138                                 "    edges                    - all known connections in the VPN\n"
 139                                 "    subnets                  - all known subnets in the VPN\n"
 140                                 "    connections              - all meta connections with ourself\n"
 141                                 "    graph                    - graph of the VPN in dotty format\n"
 142                                 "  info NODE|SUBNET|ADDRESS   Give information about a particular NODE, SUBNET or ADDRESS.\n"
 143                                 "  purge                      Purge unreachable nodes\n"
 144                                 "  debug N                    Set debug level\n"
 145                                 "  retry                      Retry all outgoing connections\n"
 146                                 "  disconnect NODE            Close meta connection with NODE\n"
 147 #ifdef HAVE_CURSES
 148                                 "  top                        Show real-time statistics\n"
 149 #endif
 150                                 "  pcap [snaplen]             Dump traffic in pcap format [up to snaplen bytes per packet]\n"
 151                                 "  log [level]                Dump log output [up to the specified level]\n"
 152                                 "  export                     Export host configuration of local node to standard output\n"
 153                                 "  export-all                 Export all host configuration files to standard output\n"
 154                                 "  import [--force]           Import host configuration file(s) from standard input\n"
 155                                 "\n");
 156                 printf("Report bugs to tinc@tinc-vpn.org.\n");
 157         }
 158 }
 159
 160 static bool parse_options(int argc, char **argv) {
 161         int r;
 162         int option_index = 0;
 163
 164         while((r = getopt_long(argc, argv, "c:n:Dd::Lo:RU:", long_options, &option_index)) != EOF) {
 165                 switch (r) {
 166                         case 0:                         /* long option */
 167                                 break;
 168
 169                         case 'c':                               /* config file */
 170                                 confbase = xstrdup(optarg);
 171                                 break;
 172
 173                         case 'n':                               /* net name given */
 174                                 netname = xstrdup(optarg);
 175                                 break;
 176
 177                         case 1:                                 /* show help */
 178                                 show_help = true;
 179                                 break;
 180
 181                         case 2:                                 /* show version */
 182                                 show_version = true;
 183                                 break;
 184
 185                         case 5:                                 /* open control socket here */
 186                                 pidfilename = xstrdup(optarg);
 187                                 break;
 188
 189                         case 6:
 190                                 force = true;
 191                                 break;
 192
 193                         case '?':
 194                                 usage(true);
 195                                 return false;
 196
 197                         default:
 198                                 break;
 199                 }
 200         }
 201
 202         if(!netname && (netname = getenv("NETNAME")))
 203                 netname = xstrdup(netname);
 204
 205         /* netname "." is special: a "top-level name" */
 206
 207         if(netname && (!*netname || !strcmp(netname, "."))) {
 208                 free(netname);
 209                 netname = NULL;
 210         }
 211
 212         if(netname && (strpbrk(netname, "\\/") || *netname == '.')) {
 213                 fprintf(stderr, "Invalid character in netname!\n");
 214                 return false;
 215         }
 216
 217         return true;
 218 }
 219
 220 static FILE *ask_and_open(const char *filename, const char *what, const char *mode, bool ask) {
 221         FILE *r;
 222         char *directory;
 223         char buf[PATH_MAX];
 224         char buf2[PATH_MAX];
 225
 226         /* Check stdin and stdout */
 227         if(ask && tty) {
 228                 /* Ask for a file and/or directory name. */
 229                 fprintf(stdout, "Please enter a file to save %s to [%s]: ",
 230                                 what, filename);
 231                 fflush(stdout);
 232
 233                 if(fgets(buf, sizeof buf, stdin) == NULL) {
 234                         fprintf(stderr, "Error while reading stdin: %s\n",
 235                                         strerror(errno));
 236                         return NULL;
 237                 }
 238
 239                 size_t len = strlen(buf);
 240                 if(len)
 241                         buf[--len] = 0;
 242
 243                 if(len)
 244                         filename = buf;
 245         }
 246
 247 #ifdef HAVE_MINGW
 248         if(filename[0] != '\\' && filename[0] != '/' && !strchr(filename, ':')) {
 249 #else
 250         if(filename[0] != '/') {
 251 #endif
 252                 /* The directory is a relative path or a filename. */
 253                 directory = get_current_dir_name();
 254                 snprintf(buf2, sizeof buf2, "%s" SLASH "%s", directory, filename);
 255                 filename = buf2;
 256         }
 257
 258         umask(0077);                            /* Disallow everything for group and other */
 259
 260         /* Open it first to keep the inode busy */
 261
 262         r = fopen(filename, mode);
 263
 264         if(!r) {
 265                 fprintf(stderr, "Error opening file `%s': %s\n", filename, strerror(errno));
 266                 return NULL;
 267         }
 268
 269         return r;
 270 }
 271
 272 /*
 273   Generate a public/private ECDSA keypair, and ask for a file to store
 274   them in.
 275 */
 276 static bool ecdsa_keygen(bool ask) {
 277         ecdsa_t key;
 278         FILE *f;
 279         char *filename;
 280
 281         fprintf(stderr, "Generating ECDSA keypair:\n");
 282
 283         if(!ecdsa_generate(&key)) {
 284                 fprintf(stderr, "Error during key generation!\n");
 285                 return false;
 286         } else
 287                 fprintf(stderr, "Done.\n");
 288
 289         xasprintf(&filename, "%s" SLASH "ecdsa_key.priv", confbase);
 290         f = ask_and_open(filename, "private ECDSA key", "a", ask);
 291
 292         if(!f)
 293                 return false;
 294
 295 #ifdef HAVE_FCHMOD
 296         /* Make it unreadable for others. */
 297         fchmod(fileno(f), 0600);
 298 #endif
 299
 300         if(ftell(f))
 301                 fprintf(stderr, "Appending key to existing contents.\nMake sure only one key is stored in the file.\n");
 302
 303         ecdsa_write_pem_private_key(&key, f);
 304
 305         fclose(f);
 306         free(filename);
 307
 308         if(name)
 309                 xasprintf(&filename, "%s" SLASH "hosts" SLASH "%s", confbase, name);
 310         else
 311                 xasprintf(&filename, "%s" SLASH "ecdsa_key.pub", confbase);
 312
 313         f = ask_and_open(filename, "public ECDSA key", "a", ask);
 314
 315         if(!f)
 316                 return false;
 317
 318         if(ftell(f))
 319                 fprintf(stderr, "Appending key to existing contents.\nMake sure only one key is stored in the file.\n");
 320
 321         char *pubkey = ecdsa_get_base64_public_key(&key);
 322         fprintf(f, "ECDSAPublicKey = %s\n", pubkey);
 323         free(pubkey);
 324
 325         fclose(f);
 326         free(filename);
 327
 328         return true;
 329 }
 330
 331 /*
 332   Generate a public/private RSA keypair, and ask for a file to store
 333   them in.
 334 */
 335 static bool rsa_keygen(int bits, bool ask) {
 336         rsa_t key;
 337         FILE *f;
 338         char *filename;
 339
 340         fprintf(stderr, "Generating %d bits keys:\n", bits);
 341
 342         if(!rsa_generate(&key, bits, 0x10001)) {
 343                 fprintf(stderr, "Error during key generation!\n");
 344                 return false;
 345         } else
 346                 fprintf(stderr, "Done.\n");
 347
 348         xasprintf(&filename, "%s" SLASH "rsa_key.priv", confbase);
 349         f = ask_and_open(filename, "private RSA key", "a", ask);
 350
 351         if(!f)
 352                 return false;
 353
 354 #ifdef HAVE_FCHMOD
 355         /* Make it unreadable for others. */
 356         fchmod(fileno(f), 0600);
 357 #endif
 358
 359         if(ftell(f))
 360                 fprintf(stderr, "Appending key to existing contents.\nMake sure only one key is stored in the file.\n");
 361
 362         rsa_write_pem_private_key(&key, f);
 363
 364         fclose(f);
 365         free(filename);
 366
 367         if(name)
 368                 xasprintf(&filename, "%s" SLASH "hosts" SLASH "%s", confbase, name);
 369         else
 370                 xasprintf(&filename, "%s" SLASH "rsa_key.pub", confbase);
 371
 372         f = ask_and_open(filename, "public RSA key", "a", ask);
 373
 374         if(!f)
 375                 return false;
 376
 377         if(ftell(f))
 378                 fprintf(stderr, "Appending key to existing contents.\nMake sure only one key is stored in the file.\n");
 379
 380         rsa_write_pem_public_key(&key, f);
 381
 382         fclose(f);
 383         free(filename);
 384
 385         return true;
 386 }
 387
 388 /*
 389   Set all files and paths according to netname
 390 */
 391 static void make_names(void) {
 392 #ifdef HAVE_MINGW
 393         HKEY key;
 394         char installdir[1024] = "";
 395         long len = sizeof installdir;
 396 #endif
 397
 398         if(netname)
 399                 xasprintf(&identname, "tinc.%s", netname);
 400         else
 401                 identname = xstrdup("tinc");
 402
 403 #ifdef HAVE_MINGW
 404         if(!RegOpenKeyEx(HKEY_LOCAL_MACHINE, "SOFTWARE\\tinc", 0, KEY_READ, &key)) {
 405                 if(!RegQueryValueEx(key, NULL, 0, 0, installdir, &len)) {
 406                         if(!confbase) {
 407                                 if(netname)
 408                                         xasprintf(&confbase, "%s" SLASH "%s", installdir, netname);
 409                                 else
 410                                         xasprintf(&confbase, "%s", installdir);
 411                         }
 412                 }
 413                 if(!pidfilename)
 414                         xasprintf(&pidfilename, "%s" SLASH "pid", confbase);
 415                 RegCloseKey(key);
 416         }
 417
 418         if(!*installdir) {
 419 #endif
 420         confdir = xstrdup(CONFDIR);
 421
 422         if(!pidfilename)
 423                 xasprintf(&pidfilename, "%s" SLASH "run" SLASH "%s.pid", LOCALSTATEDIR, identname);
 424
 425         if(netname) {
 426                 if(!confbase)
 427                         xasprintf(&confbase, CONFDIR SLASH "tinc" SLASH "%s", netname);
 428                 else
 429                         fprintf(stderr, "Both netname and configuration directory given, using the latter...\n");
 430         } else {
 431                 if(!confbase)
 432                         xasprintf(&confbase, CONFDIR SLASH "tinc");
 433         }
 434
 435 #ifdef HAVE_MINGW
 436         } else
 437                 confdir = xstrdup(installdir);
 438 #endif
 439
 440         xasprintf(&tinc_conf, "%s" SLASH "tinc.conf", confbase);
 441         xasprintf(&hosts_dir, "%s" SLASH "hosts", confbase);
 442 }
 443
 444 static char buffer[4096];
 445 static size_t blen = 0;
 446
 447 bool recvline(int fd, char *line, size_t len) {
 448         char *newline = NULL;
 449
 450         while(!(newline = memchr(buffer, '\n', blen))) {
 451                 int result = recv(fd, buffer + blen, sizeof buffer - blen, 0);
 452                 if(result == -1 && errno == EINTR)
 453                         continue;
 454                 else if(result <= 0)
 455                         return false;
 456                 blen += result;
 457         }
 458
 459         if(newline - buffer >= len)
 460                 return false;
 461
 462         len = newline - buffer;
 463
 464         memcpy(line, buffer, len);
 465         line[len] = 0;
 466         memmove(buffer, newline + 1, blen - len - 1);
 467         blen -= len + 1;
 468
 469         return true;
 470 }
 471
 472 static bool recvdata(int fd, char *data, size_t len) {
 473         while(blen < len) {
 474                 int result = recv(fd, buffer + blen, sizeof buffer - blen, 0);
 475                 if(result == -1 && errno == EINTR)
 476                         continue;
 477                 else if(result <= 0)
 478                         return false;
 479                 blen += result;
 480         }
 481
 482         memcpy(data, buffer, len);
 483         memmove(buffer, buffer + len, blen - len);
 484         blen -= len;
 485
 486         return true;
 487 }
 488
 489 bool sendline(int fd, char *format, ...) {
 490         static char buffer[4096];
 491         char *p = buffer;
 492         int blen = 0;
 493         va_list ap;
 494
 495         va_start(ap, format);
 496         blen = vsnprintf(buffer, sizeof buffer, format, ap);
 497         va_end(ap);
 498
 499         if(blen < 1 || blen >= sizeof buffer)
 500                 return false;
 501
 502         buffer[blen] = '\n';
 503         blen++;
 504
 505         while(blen) {
 506                 int result = send(fd, p, blen, 0);
 507                 if(result == -1 && errno == EINTR)
 508                         continue;
 509                 else if(result <= 0)
 510                         return false;
 511                 p += result;
 512                 blen -= result;
 513         }
 514
 515         return true;
 516 }
 517
 518 static void pcap(int fd, FILE *out, int snaplen) {
 519         sendline(fd, "%d %d %d", CONTROL, REQ_PCAP, snaplen);
 520         char data[9018];
 521
 522         struct {
 523                 uint32_t magic;
 524                 uint16_t major;
 525                 uint16_t minor;
 526                 uint32_t tz_offset;
 527                 uint32_t tz_accuracy;
 528                 uint32_t snaplen;
 529                 uint32_t ll_type;
 530         } header = {
 531                 0xa1b2c3d4,
 532                 2, 4,
 533                 0, 0,
 534                 snaplen ?: sizeof data,
 535                 1,
 536         };
 537
 538         struct {
 539                 uint32_t tv_sec;
 540                 uint32_t tv_usec;
 541                 uint32_t len;
 542                 uint32_t origlen;
 543         } packet;
 544
 545         struct timeval tv;
 546
 547         fwrite(&header, sizeof header, 1, out);
 548         fflush(out);
 549
 550         char line[32];
 551         while(recvline(fd, line, sizeof line)) {
 552                 int code, req, len;
 553                 int n = sscanf(line, "%d %d %d", &code, &req, &len);
 554                 gettimeofday(&tv, NULL);
 555                 if(n != 3 || code != CONTROL || req != REQ_PCAP || len < 0 || len > sizeof data)
 556                         break;
 557                 if(!recvdata(fd, data, len))
 558                         break;
 559                 packet.tv_sec = tv.tv_sec;
 560                 packet.tv_usec = tv.tv_usec;
 561                 packet.len = len;
 562                 packet.origlen = len;
 563                 fwrite(&packet, sizeof packet, 1, out);
 564                 fwrite(data, len, 1, out);
 565                 fflush(out);
 566         }
 567 }
 568
 569 static void logcontrol(int fd, FILE *out, int level) {
 570         sendline(fd, "%d %d %d", CONTROL, REQ_LOG, level);
 571         char data[1024];
 572         char line[32];
 573
 574         while(recvline(fd, line, sizeof line)) {
 575                 int code, req, len;
 576                 int n = sscanf(line, "%d %d %d", &code, &req, &len);
 577                 if(n != 3 || code != CONTROL || req != REQ_LOG || len < 0 || len > sizeof data)
 578                         break;
 579                 if(!recvdata(fd, data, len))
 580                         break;
 581                 fwrite(data, len, 1, out);
 582                 fputc('\n', out);
 583                 fflush(out);
 584         }
 585 }
 586
 587 #ifdef HAVE_MINGW
 588 static bool remove_service(void) {
 589         SC_HANDLE manager = NULL;
 590         SC_HANDLE service = NULL;
 591         SERVICE_STATUS status = {0};
 592
 593         manager = OpenSCManager(NULL, NULL, SC_MANAGER_ALL_ACCESS);
 594         if(!manager) {
 595                 fprintf(stderr, "Could not open service manager: %s\n", winerror(GetLastError()));
 596                 return false;
 597         }
 598
 599         service = OpenService(manager, identname, SERVICE_ALL_ACCESS);
 600
 601         if(!service) {
 602                 fprintf(stderr, "Could not open %s service: %s\n", identname, winerror(GetLastError()));
 603                 return false;
 604         }
 605
 606         if(!ControlService(service, SERVICE_CONTROL_STOP, &status))
 607                 fprintf(stderr, "Could not stop %s service: %s\n", identname, winerror(GetLastError()));
 608         else
 609                 fprintf(stderr, "%s service stopped\n", identname);
 610
 611         if(!DeleteService(service)) {
 612                 fprintf(stderr, "Could not remove %s service: %s\n", identname, winerror(GetLastError()));
 613                 return false;
 614         }
 615
 616         fprintf(stderr, "%s service removed\n", identname);
 617
 618         return true;
 619 }
 620 #endif
 621
 622 static bool connect_tincd(bool verbose) {
 623         if(fd >= 0)
 624                 return true;
 625
 626         FILE *f = fopen(pidfilename, "r");
 627         if(!f) {
 628                 if(verbose)
 629                         fprintf(stderr, "Could not open pid file %s: %s\n", pidfilename, strerror(errno));
 630                 return false;
 631         }
 632
 633         char host[128];
 634         char port[128];
 635
 636         if(fscanf(f, "%20d %1024s %128s port %128s", &pid, controlcookie, host, port) != 4) {
 637                 if(verbose)
 638                         fprintf(stderr, "Could not parse pid file %s\n", pidfilename);
 639                 fclose(f);
 640                 return false;
 641         }
 642
 643         fclose(f);
 644
 645 #ifdef HAVE_MINGW
 646         if(WSAStartup(MAKEWORD(2, 2), &wsa_state)) {
 647                 if(verbose)
 648                         fprintf(stderr, "System call `%s' failed: %s", "WSAStartup", winerror(GetLastError()));
 649                 return false;
 650         }
 651 #endif
 652
 653         struct addrinfo hints = {
 654                 .ai_family = AF_UNSPEC,
 655                 .ai_socktype = SOCK_STREAM,
 656                 .ai_protocol = IPPROTO_TCP,
 657                 .ai_flags = 0,
 658         };
 659
 660         struct addrinfo *res = NULL;
 661
 662         if(getaddrinfo(host, port, &hints, &res) || !res) {
 663                 if(verbose)
 664                         fprintf(stderr, "Cannot resolve %s port %s: %s", host, port, strerror(errno));
 665                 return false;
 666         }
 667
 668         fd = socket(res->ai_family, SOCK_STREAM, IPPROTO_TCP);
 669         if(fd < 0) {
 670                 if(verbose)
 671                         fprintf(stderr, "Cannot create TCP socket: %s\n", sockstrerror(sockerrno));
 672                 return false;
 673         }
 674
 675 #ifdef HAVE_MINGW
 676         unsigned long arg = 0;
 677
 678         if(ioctlsocket(fd, FIONBIO, &arg) != 0) {
 679                 if(verbose)
 680                         fprintf(stderr, "ioctlsocket failed: %s", sockstrerror(sockerrno));
 681         }
 682 #endif
 683
 684         if(connect(fd, res->ai_addr, res->ai_addrlen) < 0) {
 685                 if(verbose)
 686                         fprintf(stderr, "Cannot connect to %s port %s: %s\n", host, port, sockstrerror(sockerrno));
 687                 return false;
 688         }
 689
 690         freeaddrinfo(res);
 691
 692         char data[4096];
 693         int version;
 694
 695         if(!recvline(fd, line, sizeof line) || sscanf(line, "%d %s %d", &code, data, &version) != 3 || code != 0) {
 696                 if(verbose)
 697                         fprintf(stderr, "Cannot read greeting from control socket: %s\n", sockstrerror(sockerrno));
 698                 return false;
 699         }
 700
 701         sendline(fd, "%d ^%s %d", ID, controlcookie, TINC_CTL_VERSION_CURRENT);
 702
 703         if(!recvline(fd, line, sizeof line) || sscanf(line, "%d %d %d", &code, &version, &pid) != 3 || code != 4 || version != TINC_CTL_VERSION_CURRENT) {
 704                 if(verbose)
 705                         fprintf(stderr, "Could not fully establish control socket connection\n");
 706                 return false;
 707         }
 708
 709         return true;
 710 }
 711
 712
 713 static int cmd_start(int argc, char *argv[]) {
 714         if(connect_tincd(false)) {
 715                 if(netname)
 716                         fprintf(stderr, "A tincd is already running for net `%s' with pid %d.\n", netname, pid);
 717                 else
 718                         fprintf(stderr, "A tincd is already running with pid %d.\n", pid);
 719                 return 0;
 720         }
 721
 722         char *c;
 723         char *slash = strrchr(program_name, '/');
 724
 725 #ifdef HAVE_MINGW
 726         if ((c = strrchr(program_name, '\\')) > slash)
 727                 slash = c;
 728 #endif
 729
 730         if (slash++)
 731                 xasprintf(&c, "%.*stincd", (int)(slash - program_name), program_name);
 732         else
 733                 c = "tincd";
 734
 735         int nargc = 0;
 736         char **nargv = xmalloc_and_zero((orig_argc + argc) * sizeof *nargv);
 737
 738         for(int i = 0; i < orig_argc; i++)
 739                 nargv[nargc++] = orig_argv[i];
 740         for(int i = 1; i < argc; i++)
 741                 nargv[nargc++] = argv[i];
 742
 743 #ifdef HAVE_MINGW
 744         execvp(c, nargv);
 745         fprintf(stderr, "Error starting %s: %s\n", c, strerror(errno));
 746         return 1;
 747 #else
 748         pid_t pid = fork();
 749         if(pid == -1) {
 750                 fprintf(stderr, "Could not fork: %s\n", strerror(errno));
 751                 return 1;
 752         }
 753
 754         if(!pid)
 755                 exit(execvp(c, nargv));
 756
 757         int status = -1;
 758         if(waitpid(pid, &status, 0) != pid || !WIFEXITED(status) || WEXITSTATUS(status)) {
 759                 fprintf(stderr, "Error starting %s\n", c);
 760                 return 1;
 761         }
 762
 763         return 0;
 764 #endif
 765 }
 766
 767 static int cmd_stop(int argc, char *argv[]) {
 768 #ifndef HAVE_MINGW
 769         if(!connect_tincd(true)) {
 770                 if(pid) {
 771                         if(kill(pid, SIGTERM))
 772                                 return 1;
 773                         fprintf(stderr, "Sent TERM signal to process with PID %u.\n", pid);
 774                         return 0;
 775                 }
 776
 777                 return 1;
 778         }
 779
 780         sendline(fd, "%d %d", CONTROL, REQ_STOP);
 781         if(!recvline(fd, line, sizeof line) || sscanf(line, "%d %d %d", &code, &req, &result) != 3 || code != CONTROL || req != REQ_STOP || result) {
 782                 fprintf(stderr, "Could not stop tinc daemon.\n");
 783                 return 1;
 784         }
 785 #else
 786         if(!remove_service())
 787                 return 1;
 788 #endif
 789         close(fd);
 790         pid = 0;
 791         fd = -1;
 792
 793         return 0;
 794 }
 795
 796 static int cmd_restart(int argc, char *argv[]) {
 797         cmd_stop(argc, argv);
 798         return cmd_start(argc, argv);
 799 }
 800
 801 static int cmd_reload(int argc, char *argv[]) {
 802         if(!connect_tincd(true))
 803                 return 1;
 804
 805         sendline(fd, "%d %d", CONTROL, REQ_RELOAD);
 806         if(!recvline(fd, line, sizeof line) || sscanf(line, "%d %d %d", &code, &req, &result) != 3 || code != CONTROL || req != REQ_RELOAD || result) {
 807                 fprintf(stderr, "Could not reload configuration.\n");
 808                 return 1;
 809         }
 810
 811         return 0;
 812
 813 }
 814
 815 static int cmd_dump(int argc, char *argv[]) {
 816         if(argc != 2) {
 817                 fprintf(stderr, "Invalid number of arguments.\n");
 818                 usage(true);
 819                 return 1;
 820         }
 821
 822         if(!connect_tincd(true))
 823                 return 1;
 824
 825         bool do_graph = false;
 826
 827         if(!strcasecmp(argv[1], "nodes"))
 828                 sendline(fd, "%d %d", CONTROL, REQ_DUMP_NODES);
 829         else if(!strcasecmp(argv[1], "edges"))
 830                 sendline(fd, "%d %d", CONTROL, REQ_DUMP_EDGES);
 831         else if(!strcasecmp(argv[1], "subnets"))
 832                 sendline(fd, "%d %d", CONTROL, REQ_DUMP_SUBNETS);
 833         else if(!strcasecmp(argv[1], "connections"))
 834                 sendline(fd, "%d %d", CONTROL, REQ_DUMP_CONNECTIONS);
 835         else if(!strcasecmp(argv[1], "graph")) {
 836                 sendline(fd, "%d %d", CONTROL, REQ_DUMP_NODES);
 837                 sendline(fd, "%d %d", CONTROL, REQ_DUMP_EDGES);
 838                 do_graph = true;
 839         } else {
 840                 fprintf(stderr, "Unknown dump type '%s'.\n", argv[1]);
 841                 usage(true);
 842                 return 1;
 843         }
 844
 845         if(do_graph)
 846                 printf("digraph {\n");
 847
 848         while(recvline(fd, line, sizeof line)) {
 849                 char node1[4096], node2[4096];
 850                 int n = sscanf(line, "%d %d %s to %s", &code, &req, node1, node2);
 851                 if(n == 2) {
 852                         if(do_graph && req == REQ_DUMP_NODES)
 853                                 continue;
 854                         else {
 855                                 if(do_graph)
 856                                         printf("}\n");
 857                                 return 0;
 858                         }
 859                 }
 860                 if(n < 2)
 861                         break;
 862
 863                 if(!do_graph)
 864                         printf("%s\n", line + 5);
 865                 else {
 866                         if(req == REQ_DUMP_NODES)
 867                                 printf(" %s [label = \"%s\"];\n", node1, node1);
 868                         else
 869                                 printf(" %s -> %s;\n", node1, node2);
 870                 }
 871         }
 872
 873         fprintf(stderr, "Error receiving dump.\n");
 874         return 1;
 875 }
 876
 877 static int cmd_purge(int argc, char *argv[]) {
 878         if(!connect_tincd(true))
 879                 return 1;
 880
 881         sendline(fd, "%d %d", CONTROL, REQ_PURGE);
 882         if(!recvline(fd, line, sizeof line) || sscanf(line, "%d %d %d", &code, &req, &result) != 3 || code != CONTROL || req != REQ_PURGE || result) {
 883                 fprintf(stderr, "Could not purge old information.\n");
 884                 return 1;
 885         }
 886
 887         return 0;
 888 }
 889
 890 static int cmd_debug(int argc, char *argv[]) {
 891         if(argc != 2) {
 892                 fprintf(stderr, "Invalid number of arguments.\n");
 893                 return 1;
 894         }
 895
 896         if(!connect_tincd(true))
 897                 return 1;
 898
 899         int debuglevel = atoi(argv[1]);
 900         int origlevel;
 901
 902         sendline(fd, "%d %d %d", CONTROL, REQ_SET_DEBUG, debuglevel);
 903         if(!recvline(fd, line, sizeof line) || sscanf(line, "%d %d %d", &code, &req, &origlevel) != 3 || code != CONTROL || req != REQ_SET_DEBUG) {
 904                 fprintf(stderr, "Could not set debug level.\n");
 905                 return 1;
 906         }
 907
 908         fprintf(stderr, "Old level %d, new level %d.\n", origlevel, debuglevel);
 909         return 0;
 910 }
 911
 912 static int cmd_retry(int argc, char *argv[]) {
 913         if(!connect_tincd(true))
 914                 return 1;
 915
 916         sendline(fd, "%d %d", CONTROL, REQ_RETRY);
 917         if(!recvline(fd, line, sizeof line) || sscanf(line, "%d %d %d", &code, &req, &result) != 3 || code != CONTROL || req != REQ_RETRY || result) {
 918                 fprintf(stderr, "Could not retry outgoing connections.\n");
 919                 return 1;
 920         }
 921
 922         return 0;
 923 }
 924
 925 static int cmd_connect(int argc, char *argv[]) {
 926         if(argc != 2) {
 927                 fprintf(stderr, "Invalid number of arguments.\n");
 928                 return 1;
 929         }
 930
 931         if(!check_id(argv[2])) {
 932                 fprintf(stderr, "Invalid name for node.\n");
 933                 return 1;
 934         }
 935
 936         if(!connect_tincd(true))
 937                 return 1;
 938
 939         sendline(fd, "%d %d %s", CONTROL, REQ_CONNECT, argv[1]);
 940         if(!recvline(fd, line, sizeof line) || sscanf(line, "%d %d %d", &code, &req, &result) != 3 || code != CONTROL || req != REQ_CONNECT || result) {
 941                 fprintf(stderr, "Could not connect to %s.\n", argv[1]);
 942                 return 1;
 943         }
 944
 945         return 0;
 946 }
 947
 948 static int cmd_disconnect(int argc, char *argv[]) {
 949         if(argc != 2) {
 950                 fprintf(stderr, "Invalid number of arguments.\n");
 951                 return 1;
 952         }
 953
 954         if(!check_id(argv[2])) {
 955                 fprintf(stderr, "Invalid name for node.\n");
 956                 return 1;
 957         }
 958
 959         if(!connect_tincd(true))
 960                 return 1;
 961
 962         sendline(fd, "%d %d %s", CONTROL, REQ_DISCONNECT, argv[1]);
 963         if(!recvline(fd, line, sizeof line) || sscanf(line, "%d %d %d", &code, &req, &result) != 3 || code != CONTROL || req != REQ_DISCONNECT || result) {
 964                 fprintf(stderr, "Could not disconnect %s.\n", argv[1]);
 965                 return 1;
 966         }
 967
 968         return 0;
 969 }
 970
 971 static int cmd_top(int argc, char *argv[]) {
 972 #ifdef HAVE_CURSES
 973         if(!connect_tincd(true))
 974                 return 1;
 975
 976         top(fd);
 977         return 0;
 978 #else
 979         fprintf(stderr, "This version of tincctl was compiled without support for the curses library.\n");
 980         return 1;
 981 #endif
 982 }
 983
 984 static int cmd_pcap(int argc, char *argv[]) {
 985         if(!connect_tincd(true))
 986                 return 1;
 987
 988         pcap(fd, stdout, argc > 1 ? atoi(argv[1]) : 0);
 989         return 0;
 990 }
 991
 992 static int cmd_log(int argc, char *argv[]) {
 993         if(!connect_tincd(true))
 994                 return 1;
 995
 996         logcontrol(fd, stdout, argc > 1 ? atoi(argv[1]) : -1);
 997         return 0;
 998 }
 999
1000 static int cmd_pid(int argc, char *argv[]) {
1001         if(!connect_tincd(true) && !pid)
1002                 return 1;
1003
1004         printf("%d\n", pid);
1005         return 0;
1006 }
1007
1008 static int rstrip(char *value) {
1009         int len = strlen(value);
1010         while(len && strchr("\t\r\n ", value[len - 1]))
1011                 value[--len] = 0;
1012         return len;
1013 }
1014
1015 static char *get_my_name() {
1016         FILE *f = fopen(tinc_conf, "r");
1017         if(!f) {
1018                 fprintf(stderr, "Could not open %s: %s\n", tinc_conf, strerror(errno));
1019                 return NULL;
1020         }
1021
1022         char buf[4096];
1023         char *value;
1024         while(fgets(buf, sizeof buf, f)) {
1025                 int len = strcspn(buf, "\t =");
1026                 value = buf + len;
1027                 value += strspn(value, "\t ");
1028                 if(*value == '=') {
1029                         value++;
1030                         value += strspn(value, "\t ");
1031                 }
1032                 if(!rstrip(value))
1033                         continue;
1034                 buf[len] = 0;
1035                 if(strcasecmp(buf, "Name"))
1036                         continue;
1037                 if(*value) {
1038                         fclose(f);
1039                         return strdup(value);
1040                 }
1041         }
1042
1043         fclose(f);
1044         fprintf(stderr, "Could not find Name in %s.\n", tinc_conf);
1045         return NULL;
1046 }
1047
1048 #define VAR_SERVER 1    /* Should be in tinc.conf */
1049 #define VAR_HOST 2      /* Can be in host config file */
1050 #define VAR_MULTIPLE 4  /* Multiple statements allowed */
1051 #define VAR_OBSOLETE 8  /* Should not be used anymore */
1052
1053 static struct {
1054         const char *name;
1055         int type;
1056 } const variables[] = {
1057         /* Server configuration */
1058         {"AddressFamily", VAR_SERVER},
1059         {"BindToAddress", VAR_SERVER | VAR_MULTIPLE},
1060         {"BindToInterface", VAR_SERVER},
1061         {"Broadcast", VAR_SERVER},
1062         {"ConnectTo", VAR_SERVER | VAR_MULTIPLE},
1063         {"DecrementTTL", VAR_SERVER},
1064         {"Device", VAR_SERVER},
1065         {"DeviceType", VAR_SERVER},
1066         {"DirectOnly", VAR_SERVER},
1067         {"ECDSAPrivateKeyFile", VAR_SERVER},
1068         {"ExperimentalProtocol", VAR_SERVER},
1069         {"Forwarding", VAR_SERVER},
1070         {"GraphDumpFile", VAR_SERVER},
1071         {"Hostnames", VAR_SERVER},
1072         {"IffOneQueue", VAR_SERVER},
1073         {"Interface", VAR_SERVER},
1074         {"KeyExpire", VAR_SERVER},
1075         {"LocalDiscovery", VAR_SERVER},
1076         {"MACExpire", VAR_SERVER},
1077         {"MaxOutputBufferSize", VAR_SERVER},
1078         {"MaxTimeout", VAR_SERVER},
1079         {"Mode", VAR_SERVER},
1080         {"Name", VAR_SERVER},
1081         {"PingInterval", VAR_SERVER},
1082         {"PingTimeout", VAR_SERVER},
1083         {"PriorityInheritance", VAR_SERVER},
1084         {"PrivateKey", VAR_SERVER | VAR_OBSOLETE},
1085         {"PrivateKeyFile", VAR_SERVER},
1086         {"ProcessPriority", VAR_SERVER},
1087         {"Proxy", VAR_SERVER},
1088         {"ReplayWindow", VAR_SERVER},
1089         {"StrictSubnets", VAR_SERVER},
1090         {"TunnelServer", VAR_SERVER},
1091         {"UDPRcvBuf", VAR_SERVER},
1092         {"UDPSndBuf", VAR_SERVER},
1093         {"VDEGroup", VAR_SERVER},
1094         {"VDEPort", VAR_SERVER},
1095         /* Host configuration */
1096         {"Address", VAR_HOST | VAR_MULTIPLE},
1097         {"Cipher", VAR_SERVER | VAR_HOST},
1098         {"ClampMSS", VAR_SERVER | VAR_HOST},
1099         {"Compression", VAR_SERVER | VAR_HOST},
1100         {"Digest", VAR_SERVER | VAR_HOST},
1101         {"ECDSAPublicKey", VAR_HOST},
1102         {"ECDSAPublicKeyFile", VAR_SERVER | VAR_HOST},
1103         {"IndirectData", VAR_SERVER | VAR_HOST},
1104         {"MACLength", VAR_SERVER | VAR_HOST},
1105         {"PMTU", VAR_SERVER | VAR_HOST},
1106         {"PMTUDiscovery", VAR_SERVER | VAR_HOST},
1107         {"Port", VAR_HOST},
1108         {"PublicKey", VAR_HOST | VAR_OBSOLETE},
1109         {"PublicKeyFile", VAR_SERVER | VAR_HOST | VAR_OBSOLETE},
1110         {"Subnet", VAR_HOST | VAR_MULTIPLE},
1111         {"TCPOnly", VAR_SERVER | VAR_HOST},
1112         {"Weight", VAR_HOST},
1113         {NULL, 0}
1114 };
1115
1116 static int cmd_config(int argc, char *argv[]) {
1117         if(argc < 2) {
1118                 fprintf(stderr, "Invalid number of arguments.\n");
1119                 return 1;
1120         }
1121
1122         int action = -2;
1123         if(!strcasecmp(argv[1], "get")) {
1124                 argv++, argc--;
1125         } else if(!strcasecmp(argv[1], "add")) {
1126                 argv++, argc--, action = 1;
1127         } else if(!strcasecmp(argv[1], "del")) {
1128                 argv++, argc--, action = -1;
1129         } else if(!strcasecmp(argv[1], "replace") || !strcasecmp(argv[1], "set") || !strcasecmp(argv[1], "change")) {
1130                 argv++, argc--, action = 0;
1131         }
1132
1133         if(argc < 2) {
1134                 fprintf(stderr, "Invalid number of arguments.\n");
1135                 return 1;
1136         }
1137
1138         // Concatenate the rest of the command line
1139         strncpy(line, argv[1], sizeof line - 1);
1140         for(int i = 2; i < argc; i++) {
1141                 strncat(line, " ", sizeof line - 1 - strlen(line));
1142                 strncat(line, argv[i], sizeof line - 1 - strlen(line));
1143         }
1144
1145         // Liberal parsing into node name, variable name and value.
1146         char *node = NULL;
1147         char *variable;
1148         char *value;
1149         int len;
1150
1151         len = strcspn(line, "\t =");
1152         value = line + len;
1153         value += strspn(value, "\t ");
1154         if(*value == '=') {
1155                 value++;
1156                 value += strspn(value, "\t ");
1157         }
1158         line[len] = '\0';
1159         variable = strchr(line, '.');
1160         if(variable) {
1161                 node = line;
1162                 *variable++ = 0;
1163         } else {
1164                 variable = line;
1165         }
1166
1167         if(!*variable) {
1168                 fprintf(stderr, "No variable given.\n");
1169                 return 1;
1170         }
1171
1172         if(action >= 0 && !*value) {
1173                 fprintf(stderr, "No value for variable given.\n");
1174                 return 1;
1175         }
1176
1177         if(action < -1 && *value)
1178                 action = 0;
1179
1180         /* Some simple checks. */
1181         bool found = false;
1182
1183         for(int i = 0; variables[i].name; i++) {
1184                 if(strcasecmp(variables[i].name, variable))
1185                         continue;
1186
1187                 found = true;
1188                 variable = (char *)variables[i].name;
1189
1190                 /* Discourage use of obsolete variables. */
1191
1192                 if(variables[i].type & VAR_OBSOLETE && action >= 0) {
1193                         if(force) {
1194                                 fprintf(stderr, "Warning: %s is an obsolete variable!\n", variable);
1195                         } else {
1196                                 fprintf(stderr, "%s is an obsolete variable! Use --force to use it anyway.\n", variable);
1197                                 return 1;
1198                         }
1199                 }
1200
1201                 /* Don't put server variables in host config files */
1202
1203                 if(node && !(variables[i].type & VAR_HOST) && action >= 0) {
1204                         if(force) {
1205                                 fprintf(stderr, "Warning: %s is not a host configuration variable!\n", variable);
1206                         } else {
1207                                 fprintf(stderr, "%s is not a host configuration variable! Use --force to use it anyway.\n", variable);
1208                                 return 1;
1209                         }
1210                 }
1211
1212                 /* Should this go into our own host config file? */
1213
1214                 if(!node && !(variables[i].type & VAR_SERVER)) {
1215                         node = get_my_name();
1216                         if(!node)
1217                                 return 1;
1218                 }
1219
1220                 break;
1221         }
1222
1223         if(node && !check_id(node)) {
1224                 fprintf(stderr, "Invalid name for node.\n");
1225                 return 1;
1226         }
1227
1228         if(!found) {
1229                 if(force || action < 0) {
1230                         fprintf(stderr, "Warning: %s is not a known configuration variable!\n", variable);
1231                 } else {
1232                         fprintf(stderr, "%s: is not a known configuration variable! Use --force to use it anyway.\n", variable);
1233                         return 1;
1234                 }
1235         }
1236
1237         // Open the right configuration file.
1238         char *filename;
1239         if(node)
1240                 xasprintf(&filename, "%s" SLASH "%s", hosts_dir, node);
1241         else
1242                 filename = tinc_conf;
1243
1244         FILE *f = fopen(filename, "r");
1245         if(!f) {
1246                 if(action < 0 || errno != ENOENT) {
1247                         fprintf(stderr, "Could not open configuration file %s: %s\n", filename, strerror(errno));
1248                         return 1;
1249                 }
1250
1251                 // If it doesn't exist, create it.
1252                 f = fopen(filename, "a+");
1253                 if(!f) {
1254                         fprintf(stderr, "Could not create configuration file %s: %s\n", filename, strerror(errno));
1255                         return 1;
1256                 } else {
1257                         fprintf(stderr, "Created configuration file %s.\n", filename);
1258                 }
1259         }
1260
1261         char *tmpfile = NULL;
1262         FILE *tf = NULL;
1263
1264         if(action >= -1) {
1265                 xasprintf(&tmpfile, "%s.config.tmp", filename);
1266                 tf = fopen(tmpfile, "w");
1267                 if(!tf) {
1268                         fprintf(stderr, "Could not open temporary file %s: %s\n", tmpfile, strerror(errno));
1269                         fclose(f);
1270                         return 1;
1271                 }
1272         }
1273
1274         // Copy the file, making modifications on the fly, unless we are just getting a value.
1275         char buf1[4096];
1276         char buf2[4096];
1277         bool set = false;
1278         bool removed = false;
1279         found = false;
1280
1281         while(fgets(buf1, sizeof buf1, f)) {
1282                 buf1[sizeof buf1 - 1] = 0;
1283                 strncpy(buf2, buf1, sizeof buf2);
1284
1285                 // Parse line in a simple way
1286                 char *bvalue;
1287                 int len;
1288
1289                 len = strcspn(buf2, "\t =");
1290                 bvalue = buf2 + len;
1291                 bvalue += strspn(bvalue, "\t ");
1292                 if(*bvalue == '=') {
1293                         bvalue++;
1294                         bvalue += strspn(bvalue, "\t ");
1295                 }
1296                 rstrip(bvalue);
1297                 buf2[len] = '\0';
1298
1299                 // Did it match?
1300                 if(!strcasecmp(buf2, variable)) {
1301                         // Get
1302                         if(action < -1) {
1303                                 found = true;
1304                                 printf("%s\n", bvalue);
1305                         // Del
1306                         } else if(action == -1) {
1307                                 if(!*value || !strcasecmp(bvalue, value)) {
1308                                         removed = true;
1309                                         continue;
1310                                 }
1311                         // Set
1312                         } else if(action == 0) {
1313                                 // Already set? Delete the rest...
1314                                 if(set)
1315                                         continue;
1316                                 // Otherwise, replace.
1317                                 if(fprintf(tf, "%s = %s\n", variable, value) < 0) {
1318                                         fprintf(stderr, "Error writing to temporary file %s: %s\n", tmpfile, strerror(errno));
1319                                         return 1;
1320                                 }
1321                                 set = true;
1322                                 continue;
1323                         }
1324                 }
1325
1326                 if(action >= -1) {
1327                         // Copy original line...
1328                         if(fputs(buf1, tf) < 0) {
1329                                 fprintf(stderr, "Error writing to temporary file %s: %s\n", tmpfile, strerror(errno));
1330                                 return 1;
1331                         }
1332
1333                         // Add newline if it is missing...
1334                         if(*buf1 && buf1[strlen(buf1) - 1] != '\n') {
1335                                 if(fputc('\n', tf) < 0) {
1336                                         fprintf(stderr, "Error writing to temporary file %s: %s\n", tmpfile, strerror(errno));
1337                                         return 1;
1338                                 }
1339                         }
1340                 }
1341         }
1342
1343         // Make sure we read everything...
1344         if(ferror(f) || !feof(f)) {
1345                 fprintf(stderr, "Error while reading from configuration file %s: %s\n", filename, strerror(errno));
1346                 return 1;
1347         }
1348
1349         if(fclose(f)) {
1350                 fprintf(stderr, "Error closing configuration file %s: %s\n", filename, strerror(errno));
1351                 return 1;
1352         }
1353
1354         // Add new variable if necessary.
1355         if(action > 0 || (action == 0 && !set)) {
1356                 if(fprintf(tf, "%s = %s\n", variable, value) < 0) {
1357                         fprintf(stderr, "Error writing to temporary file %s: %s\n", tmpfile, strerror(errno));
1358                         return 1;
1359                 }
1360         }
1361
1362         if(action < -1) {
1363                 if(!found)
1364                         fprintf(stderr, "No matching configuration variables found.\n");
1365                 return 0;
1366         }
1367
1368         // Make sure we wrote everything...
1369         if(fclose(tf)) {
1370                 fprintf(stderr, "Error closing temporary file %s: %s\n", tmpfile, strerror(errno));
1371                 return 1;
1372         }
1373
1374         // Could we find what we had to remove?
1375         if(action < 0 && !removed) {
1376                 remove(tmpfile);
1377                 fprintf(stderr, "No configuration variables deleted.\n");
1378                 return *value;
1379         }
1380
1381         // Replace the configuration file with the new one
1382 #ifdef HAVE_MINGW
1383         if(remove(filename)) {
1384                 fprintf(stderr, "Error replacing file %s: %s\n", filename, strerror(errno));
1385                 return 1;
1386         }
1387 #endif
1388         if(rename(tmpfile, filename)) {
1389                 fprintf(stderr, "Error renaming temporary file %s to configuration file %s: %s\n", tmpfile, filename, strerror(errno));
1390                 return 1;
1391         }
1392
1393         // Silently try notifying a running tincd of changes.
1394         if(connect_tincd(false))
1395                 sendline(fd, "%d %d", CONTROL, REQ_RELOAD);
1396
1397         return 0;
1398 }
1399
1400 bool check_id(const char *name) {
1401         if(!name || !*name)
1402                 return false;
1403
1404         for(int i = 0; i < strlen(name); i++) {
1405                 if(!isalnum(name[i]) && name[i] != '_')
1406                         return false;
1407         }
1408
1409         return true;
1410 }
1411
1412 static int cmd_init(int argc, char *argv[]) {
1413         if(!access(tinc_conf, F_OK)) {
1414                 fprintf(stderr, "Configuration file %s already exists!\n", tinc_conf);
1415                 return 1;
1416         }
1417
1418         if(argc < 2) {
1419                 if(tty) {
1420                         char buf[1024];
1421                         fprintf(stdout, "Enter the Name you want your tinc node to have: ");
1422                         fflush(stdout);
1423                         if(!fgets(buf, sizeof buf, stdin)) {
1424                                 fprintf(stderr, "Error while reading stdin: %s\n", strerror(errno));
1425                                 return 1;
1426                         }
1427                         int len = rstrip(buf);
1428                         if(!len) {
1429                                 fprintf(stderr, "No name given!\n");
1430                                 return 1;
1431                         }
1432                         name = strdup(buf);
1433                 } else {
1434                         fprintf(stderr, "No Name given!\n");
1435                         return 1;
1436                 }
1437         } else {
1438                 name = strdup(argv[1]);
1439                 if(!*name) {
1440                         fprintf(stderr, "No Name given!\n");
1441                         return 1;
1442                 }
1443         }
1444
1445         if(!check_id(name)) {
1446                 fprintf(stderr, "Invalid Name! Only a-z, A-Z, 0-9 and _ are allowed characters.\n");
1447                 return 1;
1448         }
1449
1450         if(mkdir(confdir, 0755) && errno != EEXIST) {
1451                 fprintf(stderr, "Could not create directory %s: %s\n", CONFDIR, strerror(errno));
1452                 return 1;
1453         }
1454
1455         if(mkdir(confbase, 0755) && errno != EEXIST) {
1456                 fprintf(stderr, "Could not create directory %s: %s\n", confbase, strerror(errno));
1457                 return 1;
1458         }
1459
1460         if(mkdir(hosts_dir, 0755) && errno != EEXIST) {
1461                 fprintf(stderr, "Could not create directory %s: %s\n", hosts_dir, strerror(errno));
1462                 return 1;
1463         }
1464
1465         FILE *f = fopen(tinc_conf, "w");
1466         if(!f) {
1467                 fprintf(stderr, "Could not create file %s: %s\n", tinc_conf, strerror(errno));
1468                 return 1;
1469         }
1470
1471         fprintf(f, "Name = %s\n", name);
1472         fclose(f);
1473
1474         if(!rsa_keygen(2048, false) || !ecdsa_keygen(false))
1475                 return 1;
1476
1477 #ifndef HAVE_MINGW
1478         char *filename;
1479         xasprintf(&filename, "%s" SLASH "tinc-up", confbase);
1480         if(access(filename, F_OK)) {
1481                 FILE *f = fopen(filename, "w");
1482                 if(!f) {
1483                         fprintf(stderr, "Could not create file %s: %s\n", filename, strerror(errno));
1484                         return 1;
1485                 }
1486                 fchmod(fileno(f), 0755);
1487                 fprintf(f, "#!/bin/sh\n\necho 'Unconfigured tinc-up script, please edit!'\n\n#ifconfig $INTERFACE <your vpn IP address> netmask <netmask of whole VPN>\n");
1488                 fclose(f);
1489         }
1490 #endif
1491
1492         return 0;
1493
1494 }
1495
1496 static int cmd_generate_keys(int argc, char *argv[]) {
1497         return !(rsa_keygen(argc > 1 ? atoi(argv[1]) : 2048, true) && ecdsa_keygen(true));
1498 }
1499
1500 static int cmd_generate_rsa_keys(int argc, char *argv[]) {
1501         return !rsa_keygen(argc > 1 ? atoi(argv[1]) : 2048, true);
1502 }
1503
1504 static int cmd_generate_ecdsa_keys(int argc, char *argv[]) {
1505         return !ecdsa_keygen(true);
1506 }
1507
1508 static int cmd_help(int argc, char *argv[]) {
1509         usage(false);
1510         return 0;
1511 }
1512
1513 static int cmd_version(int argc, char *argv[]) {
1514         version();
1515         return 0;
1516 }
1517
1518 static int cmd_info(int argc, char *argv[]) {
1519         if(argc != 2) {
1520                 fprintf(stderr, "Invalid number of arguments.\n");
1521                 return 1;
1522         }
1523
1524         if(!connect_tincd(true))
1525                 return 1;
1526
1527         return info(fd, argv[1]);
1528 }
1529
1530 static const char *conffiles[] = {
1531         "tinc.conf",
1532         "tinc-up",
1533         "tinc-down",
1534         "subnet-up",
1535         "subnet-down",
1536         "host-up",
1537         "host-down",
1538         NULL,
1539 };
1540
1541 static int cmd_edit(int argc, char *argv[]) {
1542         if(argc != 2) {
1543                 fprintf(stderr, "Invalid number of arguments.\n");
1544                 return 1;
1545         }
1546
1547         char *filename = NULL;
1548
1549         if(strncmp(argv[1], "hosts" SLASH, 6)) {
1550                 for(int i = 0; conffiles[i]; i++) {
1551                         if(!strcmp(argv[1], conffiles[i])) {
1552                                 xasprintf(&filename, "%s" SLASH "%s", confbase, argv[1]);
1553                                 break;
1554                         }
1555                 }
1556         } else {
1557                 argv[1] += 6;
1558         }
1559
1560         if(!filename) {
1561                 xasprintf(&filename, "%s" SLASH "%s", hosts_dir, argv[1]);
1562                 char *dash = strchr(argv[1], '-');
1563                 if(dash) {
1564                         *dash++ = 0;
1565                         if((strcmp(dash, "up") && strcmp(dash, "down")) || !check_id(argv[1])) {
1566                                 fprintf(stderr, "Invalid configuration filename.\n");
1567                                 return 1;
1568                         }
1569                 }
1570         }
1571
1572         char *command;
1573 #ifndef HAVE_MINGW
1574         xasprintf(&command, "\"%s\" \"%s\"", getenv("VISUAL") ?: getenv("EDITOR") ?: "vi", filename);
1575 #else
1576         xasprintf(&command, "edit \"%s\"", filename);
1577 #endif
1578         int result = system(command);
1579         if(result)
1580                 return result;
1581
1582         // Silently try notifying a running tincd of changes.
1583         if(connect_tincd(false))
1584                 sendline(fd, "%d %d", CONTROL, REQ_RELOAD);
1585
1586         return 0;
1587 }
1588
1589 static int export(const char *name, FILE *out) {
1590         char *filename;
1591         xasprintf(&filename, "%s" SLASH "%s", hosts_dir, name);
1592         FILE *in = fopen(filename, "r");
1593         if(!in) {
1594                 fprintf(stderr, "Could not open configuration file %s: %s\n", filename, strerror(errno));
1595                 return 1;
1596         }
1597
1598         fprintf(out, "Name = %s\n", name);
1599         char buf[4096];
1600         while(fgets(buf, sizeof buf, in)) {
1601                 if(strcspn(buf, "\t =") != 4 || strncasecmp(buf, "Name", 4))
1602                         fputs(buf, out);
1603         }
1604
1605         if(ferror(in)) {
1606                 fprintf(stderr, "Error while reading configuration file %s: %s\n", filename, strerror(errno));
1607                 fclose(in);
1608                 return 1;
1609         }
1610
1611         fclose(in);
1612         return 0;
1613 }
1614
1615 static int cmd_export(int argc, char *argv[]) {
1616         char *name = get_my_name();
1617         if(!name)
1618                 return 1;
1619
1620         return export(name, stdout);
1621 }
1622
1623 static int cmd_export_all(int argc, char *argv[]) {
1624         DIR *dir = opendir(hosts_dir);
1625         if(!dir) {
1626                 fprintf(stderr, "Could not open host configuration directory %s: %s\n", hosts_dir, strerror(errno));
1627                 return 1;
1628         }
1629
1630         bool first = true;
1631         int result = 0;
1632         struct dirent *ent;
1633
1634         while((ent = readdir(dir))) {
1635                 if(!check_id(ent->d_name))
1636                         continue;
1637
1638                 if(first)
1639                         first = false;
1640                 else
1641                         printf("#---------------------------------------------------------------#\n");
1642
1643                 result |= export(ent->d_name, stdout);
1644         }
1645
1646         closedir(dir);
1647         return result;
1648 }
1649
1650 static int cmd_import(int argc, char *argv[]) {
1651         FILE *in = stdin;
1652         FILE *out = NULL;
1653
1654         char buf[4096];
1655         char name[4096];
1656         char *filename;
1657         int count = 0;
1658         bool firstline = true;
1659
1660         while(fgets(buf, sizeof buf, in)) {
1661                 if(sscanf(buf, "Name = %s", name) == 1) {
1662                         if(!check_id(name)) {
1663                                 fprintf(stderr, "Invalid Name in input!\n");
1664                                 return 1;
1665                         }
1666
1667                         if(out)
1668                                 fclose(out);
1669
1670                         free(filename);
1671                         xasprintf(&filename, "%s" SLASH "%s", hosts_dir, name);
1672
1673                         if(!force && !access(filename, F_OK)) {
1674                                 fprintf(stderr, "Host configuration file %s already exists, skipping.\n", filename);
1675                                 out = NULL;
1676                                 continue;
1677                         }
1678
1679                         out = fopen(filename, "w");
1680                         if(!out) {
1681                                 fprintf(stderr, "Error creating configuration file %s: %s\n", filename, strerror(errno));
1682                                 return 1;
1683                         }
1684
1685                         count++;
1686                         firstline = false;
1687                         continue;
1688                 } else if(firstline) {
1689                         fprintf(stderr, "Junk at the beginning of the input, ignoring.\n");
1690                         firstline = false;
1691                 }
1692
1693
1694                 if(!strcmp(buf, "#---------------------------------------------------------------#\n"))
1695                         continue;
1696
1697                 if(out) {
1698                         if(fputs(buf, out) < 0) {
1699                                 fprintf(stderr, "Error writing to host configuration file %s: %s\n", filename, strerror(errno));
1700                                 return 1;
1701                         }
1702                 }
1703         }
1704
1705         if(out)
1706                 fclose(out);
1707
1708         if(count) {
1709                 fprintf(stderr, "Imported %d host configuration files.\n", count);
1710                 return 0;
1711         } else {
1712                 fprintf(stderr, "No host configuration files imported.\n");
1713                 return 1;
1714         }
1715 }
1716
1717 static const struct {
1718         const char *command;
1719         int (*function)(int argc, char *argv[]);
1720 } commands[] = {
1721         {"start", cmd_start},
1722         {"stop", cmd_stop},
1723         {"restart", cmd_restart},
1724         {"reload", cmd_reload},
1725         {"dump", cmd_dump},
1726         {"purge", cmd_purge},
1727         {"debug", cmd_debug},
1728         {"retry", cmd_retry},
1729         {"connect", cmd_connect},
1730         {"disconnect", cmd_disconnect},
1731         {"top", cmd_top},
1732         {"pcap", cmd_pcap},
1733         {"log", cmd_log},
1734         {"pid", cmd_pid},
1735         {"config", cmd_config},
1736         {"init", cmd_init},
1737         {"generate-keys", cmd_generate_keys},
1738         {"generate-rsa-keys", cmd_generate_rsa_keys},
1739         {"generate-ecdsa-keys", cmd_generate_ecdsa_keys},
1740         {"help", cmd_help},
1741         {"version", cmd_version},
1742         {"info", cmd_info},
1743         {"edit", cmd_edit},
1744         {"export", cmd_export},
1745         {"export-all", cmd_export_all},
1746         {"import", cmd_import},
1747         {NULL, NULL},
1748 };
1749
1750 #ifdef HAVE_READLINE
1751 static char *complete_command(const char *text, int state) {
1752         static int i;
1753
1754         if(!state)
1755                 i = 0;
1756         else
1757                 i++;
1758
1759         while(commands[i].command) {
1760                 if(!strncasecmp(commands[i].command, text, strlen(text)))
1761                         return xstrdup(commands[i].command);
1762                 i++;
1763         }
1764
1765         return NULL;
1766 }
1767
1768 static char *complete_dump(const char *text, int state) {
1769         const char *matches[] = {"nodes", "edges", "subnets", "connections", "graph", NULL};
1770         static int i;
1771
1772         if(!state)
1773                 i = 0;
1774         else
1775                 i++;
1776
1777         while(matches[i]) {
1778                 if(!strncasecmp(matches[i], text, strlen(text)))
1779                         return xstrdup(matches[i]);
1780                 i++;
1781         }
1782
1783         return NULL;
1784 }
1785
1786 static char *complete_config(const char *text, int state) {
1787         const char *sub[] = {"get", "set", "add", "del"};
1788         static int i;
1789         if(!state) {
1790                 i = 0;
1791                 if(!strchr(rl_line_buffer + 7, ' '))
1792                         i = -4;
1793                 else {
1794                         bool found = false;
1795                         for(int i = 0; i < 4; i++) {
1796                                 if(!strncasecmp(rl_line_buffer + 7, sub[i], strlen(sub[i])) && rl_line_buffer[7 + strlen(sub[i])] == ' ') {
1797                                         found = true;
1798                                         break;
1799                                 }
1800                         }
1801                         if(!found)
1802                                 return NULL;
1803                 }
1804         } else {
1805                 i++;
1806         }
1807
1808         while(i < 0 || variables[i].name) {
1809                 if(i < 0 && !strncasecmp(sub[i + 4], text, strlen(text)))
1810                         return xstrdup(sub[i + 4]);
1811                 if(i >= 0) {
1812                         char *dot = strchr(text, '.');
1813                         if(dot) {
1814                                 if((variables[i].type & VAR_HOST) && !strncasecmp(variables[i].name, dot + 1, strlen(dot + 1))) {
1815                                         char *match;
1816                                         xasprintf(&match, "%.*s.%s", dot - text, text, variables[i].name);
1817                                         return match;
1818                                 }
1819                         } else {
1820                                 if(!strncasecmp(variables[i].name, text, strlen(text)))
1821                                         return xstrdup(variables[i].name);
1822                         }
1823                 }
1824                 i++;
1825         }
1826
1827         return NULL;
1828 }
1829
1830 static char *complete_info(const char *text, int state) {
1831         static int i;
1832         if(!state) {
1833                 i = 0;
1834                 if(!connect_tincd(false))
1835                         return NULL;
1836                 // Check the list of nodes
1837                 sendline(fd, "%d %d", CONTROL, REQ_DUMP_NODES);
1838                 sendline(fd, "%d %d", CONTROL, REQ_DUMP_SUBNETS);
1839         }
1840
1841         while(recvline(fd, line, sizeof line)) {
1842                 char item[4096];
1843                 int n = sscanf(line, "%d %d %s", &code, &req, item);
1844                 if(n == 2) {
1845                         i++;
1846                         if(i >= 2)
1847                                 break;
1848                         else
1849                                 continue;
1850                 }
1851
1852                 if(n != 3) {
1853                         fprintf(stderr, "Unable to parse dump from tincd, n = %d, i = %d.\n", n, i);
1854                         break;
1855                 }
1856
1857                 if(!strncmp(item, text, strlen(text)))
1858                         return xstrdup(strip_weight(item));
1859         }
1860
1861         return NULL;
1862 }
1863
1864 static char *complete_nothing(const char *text, int state) {
1865         return NULL;
1866 }
1867
1868 static char **completion (const char *text, int start, int end) {
1869         char **matches = NULL;
1870
1871         if(!start)
1872                 matches = rl_completion_matches(text, complete_command);
1873         else if(!strncasecmp(rl_line_buffer, "dump ", 5))
1874                 matches = rl_completion_matches(text, complete_dump);
1875         else if(!strncasecmp(rl_line_buffer, "config ", 7))
1876                 matches = rl_completion_matches(text, complete_config);
1877         else if(!strncasecmp(rl_line_buffer, "info ", 5))
1878                 matches = rl_completion_matches(text, complete_info);
1879
1880         return matches;
1881 }
1882 #endif
1883
1884 static int cmd_shell(int argc, char *argv[]) {
1885         char *prompt;
1886         xasprintf(&prompt, "%s> ", identname);
1887         int result = 0;
1888         char buf[4096];
1889         char *line = NULL;
1890         int maxargs = argc + 16;
1891         char **nargv = xmalloc(maxargs * sizeof *nargv);
1892         optind = argc;
1893
1894         for(int i = 0; i < argc; i++)
1895                 nargv[i] = argv[i];
1896
1897 #ifdef HAVE_READLINE
1898         rl_readline_name = "tinc";
1899         rl_completion_entry_function = complete_nothing;
1900         rl_attempted_completion_function = completion;
1901         rl_filename_completion_desired = 0;
1902         char *copy = NULL;
1903 #endif
1904
1905         while(true) {
1906 #ifdef HAVE_READLINE
1907                 if(tty) {
1908                         free(copy);
1909                         free(line);
1910                         rl_basic_word_break_characters = "\t\n ";
1911                         line = readline(prompt);
1912                         if(line)
1913                                 copy = xstrdup(line);
1914                 } else {
1915                         line = fgets(buf, sizeof buf, stdin);
1916                 }
1917 #else
1918                 if(tty)
1919                         fputs(stdout, prompt);
1920
1921                 line = fgets(buf, sizeof buf, stdin);
1922 #endif
1923
1924                 if(!line)
1925                         break;
1926
1927                 /* Ignore comments */
1928
1929                 if(*line == '#')
1930                         continue;
1931
1932                 /* Split */
1933
1934                 int nargc = argc;
1935                 char *p = line + strspn(line, " \t\n");
1936                 char *next = strtok(p, " \t\n");
1937
1938                 while(p && *p) {
1939                         if(nargc >= maxargs) {
1940                                 fprintf(stderr, "next %p '%s', p %p '%s'\n", next, next, p, p);
1941                                 abort();
1942                                 maxargs *= 2;
1943                                 nargv = xrealloc(nargv, maxargs * sizeof *nargv);
1944                         }
1945
1946                         nargv[nargc++] = p;
1947                         p = next;
1948                         next = strtok(NULL, " \t\n");
1949                 }
1950
1951                 if(nargc == argc)
1952                         continue;
1953
1954                 bool found = false;
1955
1956                 for(int i = 0; commands[i].command; i++) {
1957                         if(!strcasecmp(nargv[argc], commands[i].command)) {
1958                                 result |= commands[i].function(nargc - argc - 1, nargv + argc + 1);
1959                                 found = true;
1960                                 break;
1961                         }
1962                 }
1963
1964 #ifdef HAVE_READLINE
1965                 if(found)
1966                         add_history(copy);
1967 #endif
1968
1969                 if(!found) {
1970                         fprintf(stderr, "Unknown command `%s'.\n", nargv[argc]);
1971                         result |= 1;
1972                 }
1973         }
1974
1975         if(tty)
1976                 printf("\n");
1977         return result;
1978 }
1979
1980
1981 int main(int argc, char *argv[]) {
1982         program_name = argv[0];
1983         orig_argv = argv;
1984         orig_argc = argc;
1985
1986         if(!parse_options(argc, argv))
1987                 return 1;
1988
1989         make_names();
1990
1991         if(show_version) {
1992                 version();
1993                 return 0;
1994         }
1995
1996         if(show_help) {
1997                 usage(false);
1998                 return 0;
1999         }
2000
2001         tty = isatty(0) && isatty(1);
2002
2003         if(optind >= argc)
2004                 return cmd_shell(argc, argv);
2005
2006         for(int i = 0; commands[i].command; i++) {
2007                 if(!strcasecmp(argv[optind], commands[i].command))
2008                         return commands[i].function(argc - optind, argv + optind);
2009         }
2010
2011         fprintf(stderr, "Unknown command `%s'.\n", argv[optind]);
2012         usage(true);
2013         return 1;
2014 }