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

   1 /*
   2     tincctl.c -- Controlling a running tincd
   3     Copyright (C) 2007-2013 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 "names.h"
  35 #include "rsagen.h"
  36 #include "utils.h"
  37 #include "tincctl.h"
  38 #include "top.h"
  39
  40 #ifdef HAVE_MINGW
  41 #define mkdir(a, b) mkdir(a)
  42 #endif
  43
  44 static char **orig_argv;
  45 static int orig_argc;
  46
  47 /* If nonzero, display usage information and exit. */
  48 static bool show_help = false;
  49
  50 /* If nonzero, print the version on standard output and exit.  */
  51 static bool show_version = false;
  52
  53 static char *name = NULL;
  54 static char controlcookie[1025];
  55 static char *tinc_conf = NULL;
  56 static char *hosts_dir = NULL;
  57 struct timeval now;
  58
  59 // Horrible global variables...
  60 static int pid = 0;
  61 static int fd = -1;
  62 static char line[4096];
  63 static int code;
  64 static int req;
  65 static int result;
  66 static bool force = false;
  67 static bool tty = true;
  68
  69 #ifdef HAVE_MINGW
  70 static struct WSAData wsa_state;
  71 #endif
  72
  73 static struct option const long_options[] = {
  74         {"config", required_argument, NULL, 'c'},
  75         {"debug", optional_argument, NULL, 0},
  76         {"no-detach", no_argument, NULL, 0},
  77         {"mlock", no_argument, NULL, 0},
  78         {"net", required_argument, NULL, 'n'},
  79         {"help", no_argument, NULL, 1},
  80         {"version", no_argument, NULL, 2},
  81         {"pidfile", required_argument, NULL, 5},
  82         {"logfile", required_argument, NULL, 0},
  83         {"bypass-security", no_argument, NULL, 0},
  84         {"chroot", no_argument, NULL, 0},
  85         {"user", required_argument, NULL, 0},
  86         {"option", required_argument, NULL, 0},
  87         {"force", no_argument, NULL, 6},
  88         {NULL, 0, NULL, 0}
  89 };
  90
  91 static void version(void) {
  92         printf("%s version %s (built %s %s, protocol %d.%d)\n", PACKAGE,
  93                    VERSION, __DATE__, __TIME__, PROT_MAJOR, PROT_MINOR);
  94         printf("Copyright (C) 1998-2012 Ivo Timmermans, Guus Sliepen and others.\n"
  95                         "See the AUTHORS file for a complete list.\n\n"
  96                         "tinc comes with ABSOLUTELY NO WARRANTY.  This is free software,\n"
  97                         "and you are welcome to redistribute it under certain conditions;\n"
  98                         "see the file COPYING for details.\n");
  99 }
 100
 101 static void usage(bool status) {
 102         if(status) {
 103                 fprintf(stderr, "Try `%s --help\' for more information.\n", program_name);
 104         } else {
 105                 printf("Usage: %s [options] command\n\n", program_name);
 106                 printf("Valid options are:\n"
 107                                 "  -c, --config=DIR        Read configuration options from DIR.\n"
 108                                 "  -n, --net=NETNAME       Connect to net NETNAME.\n"
 109                                 "      --pidfile=FILENAME  Read control cookie from FILENAME.\n"
 110                                 "      --help              Display this help and exit.\n"
 111                                 "      --version           Output version information and exit.\n"
 112                                 "\n"
 113                                 "Valid commands are:\n"
 114                                 "  init [name]                Create initial configuration files.\n"
 115                                 "  config                     Change configuration:\n"
 116                                 "    [get] VARIABLE           - print current value of VARIABLE\n"
 117                                 "    [set] VARIABLE VALUE     - set VARIABLE to VALUE\n"
 118                                 "    add VARIABLE VALUE       - add VARIABLE with the given VALUE\n"
 119                                 "    del VARIABLE [VALUE]     - remove VARIABLE [only ones with watching VALUE]\n"
 120                                 "  start [tincd options]      Start tincd.\n"
 121                                 "  stop                       Stop tincd.\n"
 122                                 "  restart                    Restart tincd.\n"
 123                                 "  reload                     Partially reload configuration of running tincd.\n"
 124                                 "  pid                        Show PID of currently running tincd.\n"
 125                                 "  generate-keys [bits]       Generate new RSA and ECDSA public/private keypairs.\n"
 126                                 "  generate-rsa-keys [bits]   Generate a new RSA public/private keypair.\n"
 127                                 "  generate-ecdsa-keys        Generate a new ECDSA public/private keypair.\n"
 128                                 "  dump                       Dump a list of one of the following things:\n"
 129                                 "    [reachable] nodes        - all known nodes in the VPN\n"
 130                                 "    edges                    - all known connections in the VPN\n"
 131                                 "    subnets                  - all known subnets in the VPN\n"
 132                                 "    connections              - all meta connections with ourself\n"
 133                                 "    [di]graph                - graph of the VPN in dotty format\n"
 134                                 "  info NODE|SUBNET|ADDRESS   Give information about a particular NODE, SUBNET or ADDRESS.\n"
 135                                 "  purge                      Purge unreachable nodes\n"
 136                                 "  debug N                    Set debug level\n"
 137                                 "  retry                      Retry all outgoing connections\n"
 138                                 "  disconnect NODE            Close meta connection with NODE\n"
 139 #ifdef HAVE_CURSES
 140                                 "  top                        Show real-time statistics\n"
 141 #endif
 142                                 "  pcap [snaplen]             Dump traffic in pcap format [up to snaplen bytes per packet]\n"
 143                                 "  log [level]                Dump log output [up to the specified level]\n"
 144                                 "  export                     Export host configuration of local node to standard output\n"
 145                                 "  export-all                 Export all host configuration files to standard output\n"
 146                                 "  import [--force]           Import host configuration file(s) from standard input\n"
 147                                 "  exchange [--force]         Same as export followed by import\n"
 148                                 "  exchange-all [--force]     Same as export-all followed by import\n"
 149                                 "\n");
 150                 printf("Report bugs to tinc@tinc-vpn.org.\n");
 151         }
 152 }
 153
 154 static bool parse_options(int argc, char **argv) {
 155         int r;
 156         int option_index = 0;
 157
 158         while((r = getopt_long(argc, argv, "c:n:Dd::Lo:RU:", long_options, &option_index)) != EOF) {
 159                 switch (r) {
 160                         case 0:   /* long option */
 161                                 break;
 162
 163                         case 'c': /* config file */
 164                                 confbase = xstrdup(optarg);
 165                                 break;
 166
 167                         case 'n': /* net name given */
 168                                 netname = xstrdup(optarg);
 169                                 break;
 170
 171                         case 1:   /* show help */
 172                                 show_help = true;
 173                                 break;
 174
 175                         case 2:   /* show version */
 176                                 show_version = true;
 177                                 break;
 178
 179                         case 5:   /* open control socket here */
 180                                 pidfilename = xstrdup(optarg);
 181                                 break;
 182
 183                         case 6:   /* force */
 184                                 force = true;
 185                                 break;
 186
 187                         case '?': /* wrong options */
 188                                 usage(true);
 189                                 return false;
 190
 191                         default:
 192                                 break;
 193                 }
 194         }
 195
 196         if(!netname && (netname = getenv("NETNAME")))
 197                 netname = xstrdup(netname);
 198
 199         /* netname "." is special: a "top-level name" */
 200
 201         if(netname && (!*netname || !strcmp(netname, "."))) {
 202                 free(netname);
 203                 netname = NULL;
 204         }
 205
 206         if(netname && (strpbrk(netname, "\\/") || *netname == '.')) {
 207                 fprintf(stderr, "Invalid character in netname!\n");
 208                 return false;
 209         }
 210
 211         return true;
 212 }
 213
 214 static void disable_old_keys(const char *filename, const char *what) {
 215         char tmpfile[PATH_MAX] = "";
 216         char buf[1024];
 217         bool disabled = false;
 218         bool block = false;
 219         bool error = false;
 220         FILE *r, *w;
 221
 222         r = fopen(filename, "r");
 223         if(!r)
 224                 return;
 225
 226         snprintf(tmpfile, sizeof tmpfile, "%s.tmp", filename);
 227
 228         w = fopen(tmpfile, "w");
 229
 230         while(fgets(buf, sizeof buf, r)) {
 231                 if(!block && !strncmp(buf, "-----BEGIN ", 11)) {
 232                         if((strstr(buf, " EC ") && strstr(what, "ECDSA")) || (strstr(buf, " RSA ") && strstr(what, "RSA"))) {
 233                                 disabled = true;
 234                                 block = true;
 235                         }
 236                 }
 237
 238                 bool ecdsapubkey = !strncasecmp(buf, "ECDSAPublicKey", 14) && strchr(" \t=", buf[14]) && strstr(what, "ECDSA");
 239
 240                 if(ecdsapubkey)
 241                         disabled = true;
 242
 243                 if(w) {
 244                         if(block || ecdsapubkey)
 245                                 fputc('#', w);
 246                         if(fputs(buf, w) < 0) {
 247                                 error = true;
 248                                 break;
 249                         }
 250                 }
 251
 252                 if(block && !strncmp(buf, "-----END ", 9))
 253                         block = false;
 254         }
 255
 256         if(w)
 257                 if(fclose(w) < 0)
 258                         error = true;
 259         if(ferror(r) || fclose(r) < 0)
 260                 error = true;
 261
 262         if(disabled) {
 263                 if(!w || error) {
 264                         fprintf(stderr, "Warning: old key(s) found, remove them by hand!\n");
 265                         if(w)
 266                                 unlink(tmpfile);
 267                         return;
 268                 }
 269
 270 #ifdef HAVE_MINGW
 271                 // We cannot atomically replace files on Windows.
 272                 char bakfile[PATH_MAX] = "";
 273                 snprintf(bakfile, sizeof bakfile, "%s.bak", filename);
 274                 if(rename(filename, bakfile) || rename(tmpfile, filename)) {
 275                         rename(bakfile, filename);
 276 #else
 277                 if(rename(tmpfile, filename)) {
 278 #endif
 279                         fprintf(stderr, "Warning: old key(s) found, remove them by hand!\n");
 280                 } else  {
 281 #ifdef HAVE_MINGW
 282                         unlink(bakfile);
 283 #endif
 284                         fprintf(stderr, "Warning: old key(s) found and disabled.\n");
 285                 }
 286         }
 287
 288         unlink(tmpfile);
 289 }
 290
 291 static FILE *ask_and_open(const char *filename, const char *what, const char *mode, bool ask) {
 292         FILE *r;
 293         char *directory;
 294         char buf[PATH_MAX];
 295         char buf2[PATH_MAX];
 296
 297         /* Check stdin and stdout */
 298         if(ask && tty) {
 299                 /* Ask for a file and/or directory name. */
 300                 fprintf(stdout, "Please enter a file to save %s to [%s]: ",
 301                                 what, filename);
 302                 fflush(stdout);
 303
 304                 if(fgets(buf, sizeof buf, stdin) == NULL) {
 305                         fprintf(stderr, "Error while reading stdin: %s\n",
 306                                         strerror(errno));
 307                         return NULL;
 308                 }
 309
 310                 size_t len = strlen(buf);
 311                 if(len)
 312                         buf[--len] = 0;
 313
 314                 if(len)
 315                         filename = buf;
 316         }
 317
 318 #ifdef HAVE_MINGW
 319         if(filename[0] != '\\' && filename[0] != '/' && !strchr(filename, ':')) {
 320 #else
 321         if(filename[0] != '/') {
 322 #endif
 323                 /* The directory is a relative path or a filename. */
 324                 directory = get_current_dir_name();
 325                 snprintf(buf2, sizeof buf2, "%s" SLASH "%s", directory, filename);
 326                 filename = buf2;
 327         }
 328
 329         umask(0077); /* Disallow everything for group and other */
 330
 331         disable_old_keys(filename, what);
 332
 333         /* Open it first to keep the inode busy */
 334
 335         r = fopen(filename, mode);
 336
 337         if(!r) {
 338                 fprintf(stderr, "Error opening file `%s': %s\n", filename, strerror(errno));
 339                 return NULL;
 340         }
 341
 342         return r;
 343 }
 344
 345 /*
 346   Generate a public/private ECDSA keypair, and ask for a file to store
 347   them in.
 348 */
 349 static bool ecdsa_keygen(bool ask) {
 350         ecdsa_t key;
 351         FILE *f;
 352         char *pubname, *privname;
 353
 354         fprintf(stderr, "Generating ECDSA keypair:\n");
 355
 356         if(!ecdsa_generate(&key)) {
 357                 fprintf(stderr, "Error during key generation!\n");
 358                 return false;
 359         } else
 360                 fprintf(stderr, "Done.\n");
 361
 362         xasprintf(&privname, "%s" SLASH "ecdsa_key.priv", confbase);
 363         f = ask_and_open(privname, "private ECDSA key", "a", ask);
 364         free(privname);
 365
 366         if(!f)
 367                 return false;
 368
 369 #ifdef HAVE_FCHMOD
 370         /* Make it unreadable for others. */
 371         fchmod(fileno(f), 0600);
 372 #endif
 373
 374         ecdsa_write_pem_private_key(&key, f);
 375
 376         fclose(f);
 377
 378         if(name)
 379                 xasprintf(&pubname, "%s" SLASH "hosts" SLASH "%s", confbase, name);
 380         else
 381                 xasprintf(&pubname, "%s" SLASH "ecdsa_key.pub", confbase);
 382
 383         f = ask_and_open(pubname, "public ECDSA key", "a", ask);
 384         free(pubname);
 385
 386         if(!f)
 387                 return false;
 388
 389         char *pubkey = ecdsa_get_base64_public_key(&key);
 390         fprintf(f, "ECDSAPublicKey = %s\n", pubkey);
 391         free(pubkey);
 392
 393         fclose(f);
 394
 395         return true;
 396 }
 397
 398 /*
 399   Generate a public/private RSA keypair, and ask for a file to store
 400   them in.
 401 */
 402 static bool rsa_keygen(int bits, bool ask) {
 403         rsa_t key;
 404         FILE *f;
 405         char *pubname, *privname;
 406
 407         fprintf(stderr, "Generating %d bits keys:\n", bits);
 408
 409         if(!rsa_generate(&key, bits, 0x10001)) {
 410                 fprintf(stderr, "Error during key generation!\n");
 411                 return false;
 412         } else
 413                 fprintf(stderr, "Done.\n");
 414
 415         xasprintf(&privname, "%s" SLASH "rsa_key.priv", confbase);
 416         f = ask_and_open(privname, "private RSA key", "a", ask);
 417         free(privname);
 418
 419         if(!f)
 420                 return false;
 421
 422 #ifdef HAVE_FCHMOD
 423         /* Make it unreadable for others. */
 424         fchmod(fileno(f), 0600);
 425 #endif
 426
 427         rsa_write_pem_private_key(&key, f);
 428
 429         fclose(f);
 430
 431         if(name)
 432                 xasprintf(&pubname, "%s" SLASH "hosts" SLASH "%s", confbase, name);
 433         else
 434                 xasprintf(&pubname, "%s" SLASH "rsa_key.pub", confbase);
 435
 436         f = ask_and_open(pubname, "public RSA key", "a", ask);
 437         free(pubname);
 438
 439         if(!f)
 440                 return false;
 441
 442         rsa_write_pem_public_key(&key, f);
 443
 444         fclose(f);
 445
 446         return true;
 447 }
 448
 449 static char buffer[4096];
 450 static size_t blen = 0;
 451
 452 bool recvline(int fd, char *line, size_t len) {
 453         char *newline = NULL;
 454
 455         while(!(newline = memchr(buffer, '\n', blen))) {
 456                 int result = recv(fd, buffer + blen, sizeof buffer - blen, 0);
 457                 if(result == -1 && errno == EINTR)
 458                         continue;
 459                 else if(result <= 0)
 460                         return false;
 461                 blen += result;
 462         }
 463
 464         if(newline - buffer >= len)
 465                 return false;
 466
 467         len = newline - buffer;
 468
 469         memcpy(line, buffer, len);
 470         line[len] = 0;
 471         memmove(buffer, newline + 1, blen - len - 1);
 472         blen -= len + 1;
 473
 474         return true;
 475 }
 476
 477 static bool recvdata(int fd, char *data, size_t len) {
 478         while(blen < len) {
 479                 int result = recv(fd, buffer + blen, sizeof buffer - blen, 0);
 480                 if(result == -1 && errno == EINTR)
 481                         continue;
 482                 else if(result <= 0)
 483                         return false;
 484                 blen += result;
 485         }
 486
 487         memcpy(data, buffer, len);
 488         memmove(buffer, buffer + len, blen - len);
 489         blen -= len;
 490
 491         return true;
 492 }
 493
 494 bool sendline(int fd, char *format, ...) {
 495         static char buffer[4096];
 496         char *p = buffer;
 497         int blen = 0;
 498         va_list ap;
 499
 500         va_start(ap, format);
 501         blen = vsnprintf(buffer, sizeof buffer, format, ap);
 502         va_end(ap);
 503
 504         if(blen < 1 || blen >= sizeof buffer)
 505                 return false;
 506
 507         buffer[blen] = '\n';
 508         blen++;
 509
 510         while(blen) {
 511                 int result = send(fd, p, blen, 0);
 512                 if(result == -1 && errno == EINTR)
 513                         continue;
 514                 else if(result <= 0)
 515                         return false;
 516                 p += result;
 517                 blen -= result;
 518         }
 519
 520         return true;
 521 }
 522
 523 static void pcap(int fd, FILE *out, int snaplen) {
 524         sendline(fd, "%d %d %d", CONTROL, REQ_PCAP, snaplen);
 525         char data[9018];
 526
 527         struct {
 528                 uint32_t magic;
 529                 uint16_t major;
 530                 uint16_t minor;
 531                 uint32_t tz_offset;
 532                 uint32_t tz_accuracy;
 533                 uint32_t snaplen;
 534                 uint32_t ll_type;
 535         } header = {
 536                 0xa1b2c3d4,
 537                 2, 4,
 538                 0, 0,
 539                 snaplen ?: sizeof data,
 540                 1,
 541         };
 542
 543         struct {
 544                 uint32_t tv_sec;
 545                 uint32_t tv_usec;
 546                 uint32_t len;
 547                 uint32_t origlen;
 548         } packet;
 549
 550         struct timeval tv;
 551
 552         fwrite(&header, sizeof header, 1, out);
 553         fflush(out);
 554
 555         char line[32];
 556         while(recvline(fd, line, sizeof line)) {
 557                 int code, req, len;
 558                 int n = sscanf(line, "%d %d %d", &code, &req, &len);
 559                 gettimeofday(&tv, NULL);
 560                 if(n != 3 || code != CONTROL || req != REQ_PCAP || len < 0 || len > sizeof data)
 561                         break;
 562                 if(!recvdata(fd, data, len))
 563                         break;
 564                 packet.tv_sec = tv.tv_sec;
 565                 packet.tv_usec = tv.tv_usec;
 566                 packet.len = len;
 567                 packet.origlen = len;
 568                 fwrite(&packet, sizeof packet, 1, out);
 569                 fwrite(data, len, 1, out);
 570                 fflush(out);
 571         }
 572 }
 573
 574 static void logcontrol(int fd, FILE *out, int level) {
 575         sendline(fd, "%d %d %d", CONTROL, REQ_LOG, level);
 576         char data[1024];
 577         char line[32];
 578
 579         while(recvline(fd, line, sizeof line)) {
 580                 int code, req, len;
 581                 int n = sscanf(line, "%d %d %d", &code, &req, &len);
 582                 if(n != 3 || code != CONTROL || req != REQ_LOG || len < 0 || len > sizeof data)
 583                         break;
 584                 if(!recvdata(fd, data, len))
 585                         break;
 586                 fwrite(data, len, 1, out);
 587                 fputc('\n', out);
 588                 fflush(out);
 589         }
 590 }
 591
 592 #ifdef HAVE_MINGW
 593 static bool remove_service(void) {
 594         SC_HANDLE manager = NULL;
 595         SC_HANDLE service = NULL;
 596         SERVICE_STATUS status = {0};
 597
 598         manager = OpenSCManager(NULL, NULL, SC_MANAGER_ALL_ACCESS);
 599         if(!manager) {
 600                 fprintf(stderr, "Could not open service manager: %s\n", winerror(GetLastError()));
 601                 return false;
 602         }
 603
 604         service = OpenService(manager, identname, SERVICE_ALL_ACCESS);
 605
 606         if(!service) {
 607                 fprintf(stderr, "Could not open %s service: %s\n", identname, winerror(GetLastError()));
 608                 return false;
 609         }
 610
 611         if(!ControlService(service, SERVICE_CONTROL_STOP, &status))
 612                 fprintf(stderr, "Could not stop %s service: %s\n", identname, winerror(GetLastError()));
 613         else
 614                 fprintf(stderr, "%s service stopped\n", identname);
 615
 616         if(!DeleteService(service)) {
 617                 fprintf(stderr, "Could not remove %s service: %s\n", identname, winerror(GetLastError()));
 618                 return false;
 619         }
 620
 621         fprintf(stderr, "%s service removed\n", identname);
 622
 623         return true;
 624 }
 625 #endif
 626
 627 static bool connect_tincd(bool verbose) {
 628         if(fd >= 0) {
 629                 fd_set r;
 630                 FD_ZERO(&r);
 631                 FD_SET(fd, &r);
 632                 struct timeval tv = {0, 0};
 633                 if(select(fd + 1, &r, NULL, NULL, &tv)) {
 634                         fprintf(stderr, "Previous connection to tincd lost, reconnecting.\n");
 635                         close(fd);
 636                         fd = -1;
 637                 } else {
 638                         return true;
 639                 }
 640         }
 641
 642         FILE *f = fopen(pidfilename, "r");
 643         if(!f) {
 644                 if(verbose)
 645                         fprintf(stderr, "Could not open pid file %s: %s\n", pidfilename, strerror(errno));
 646                 return false;
 647         }
 648
 649         char host[129];
 650         char port[129];
 651
 652         if(fscanf(f, "%20d %1024s %128s port %128s", &pid, controlcookie, host, port) != 4) {
 653                 if(verbose)
 654                         fprintf(stderr, "Could not parse pid file %s\n", pidfilename);
 655                 fclose(f);
 656                 return false;
 657         }
 658
 659         fclose(f);
 660
 661 #ifdef HAVE_MINGW
 662         if(WSAStartup(MAKEWORD(2, 2), &wsa_state)) {
 663                 if(verbose)
 664                         fprintf(stderr, "System call `%s' failed: %s", "WSAStartup", winerror(GetLastError()));
 665                 return false;
 666         }
 667 #endif
 668
 669 #ifndef HAVE_MINGW
 670         struct sockaddr_un sa;
 671         sa.sun_family = AF_UNIX;
 672         strncpy(sa.sun_path, unixsocketname, sizeof sa.sun_path);
 673
 674         fd = socket(AF_UNIX, SOCK_STREAM, 0);
 675         if(fd < 0) {
 676                 if(verbose)
 677                         fprintf(stderr, "Cannot create UNIX socket: %s\n", sockstrerror(sockerrno));
 678                 return false;
 679         }
 680
 681         if(connect(fd, (struct sockaddr *)&sa, sizeof sa) < 0) {
 682                 if(verbose)
 683                         fprintf(stderr, "Cannot connect to UNIX socket %s: %s\n", unixsocketname, sockstrerror(sockerrno));
 684                 close(fd);
 685                 fd = -1;
 686                 return false;
 687         }
 688 #else
 689         struct addrinfo hints = {
 690                 .ai_family = AF_UNSPEC,
 691                 .ai_socktype = SOCK_STREAM,
 692                 .ai_protocol = IPPROTO_TCP,
 693                 .ai_flags = 0,
 694         };
 695
 696         struct addrinfo *res = NULL;
 697
 698         if(getaddrinfo(host, port, &hints, &res) || !res) {
 699                 if(verbose)
 700                         fprintf(stderr, "Cannot resolve %s port %s: %s", host, port, strerror(errno));
 701                 return false;
 702         }
 703
 704         fd = socket(res->ai_family, SOCK_STREAM, IPPROTO_TCP);
 705         if(fd < 0) {
 706                 if(verbose)
 707                         fprintf(stderr, "Cannot create TCP socket: %s\n", sockstrerror(sockerrno));
 708                 return false;
 709         }
 710
 711 #ifdef HAVE_MINGW
 712         unsigned long arg = 0;
 713
 714         if(ioctlsocket(fd, FIONBIO, &arg) != 0) {
 715                 if(verbose)
 716                         fprintf(stderr, "ioctlsocket failed: %s", sockstrerror(sockerrno));
 717         }
 718 #endif
 719
 720         if(connect(fd, res->ai_addr, res->ai_addrlen) < 0) {
 721                 if(verbose)
 722                         fprintf(stderr, "Cannot connect to %s port %s: %s\n", host, port, sockstrerror(sockerrno));
 723                 close(fd);
 724                 fd = -1;
 725                 return false;
 726         }
 727
 728         freeaddrinfo(res);
 729 #endif
 730
 731         char data[4096];
 732         int version;
 733
 734         if(!recvline(fd, line, sizeof line) || sscanf(line, "%d %s %d", &code, data, &version) != 3 || code != 0) {
 735                 if(verbose)
 736                         fprintf(stderr, "Cannot read greeting from control socket: %s\n", sockstrerror(sockerrno));
 737                 close(fd);
 738                 fd = -1;
 739                 return false;
 740         }
 741
 742         sendline(fd, "%d ^%s %d", ID, controlcookie, TINC_CTL_VERSION_CURRENT);
 743
 744         if(!recvline(fd, line, sizeof line) || sscanf(line, "%d %d %d", &code, &version, &pid) != 3 || code != 4 || version != TINC_CTL_VERSION_CURRENT) {
 745                 if(verbose)
 746                         fprintf(stderr, "Could not fully establish control socket connection\n");
 747                 close(fd);
 748                 fd = -1;
 749                 return false;
 750         }
 751
 752         return true;
 753 }
 754
 755
 756 static int cmd_start(int argc, char *argv[]) {
 757         if(connect_tincd(false)) {
 758                 if(netname)
 759                         fprintf(stderr, "A tincd is already running for net `%s' with pid %d.\n", netname, pid);
 760                 else
 761                         fprintf(stderr, "A tincd is already running with pid %d.\n", pid);
 762                 return 0;
 763         }
 764
 765         char *c;
 766         char *slash = strrchr(program_name, '/');
 767
 768 #ifdef HAVE_MINGW
 769         if ((c = strrchr(program_name, '\\')) > slash)
 770                 slash = c;
 771 #endif
 772
 773         if (slash++)
 774                 xasprintf(&c, "%.*stincd", (int)(slash - program_name), program_name);
 775         else
 776                 c = "tincd";
 777
 778         int nargc = 0;
 779         char **nargv = xmalloc_and_zero((optind + argc) * sizeof *nargv);
 780
 781         nargv[nargc++] = c;
 782         for(int i = 1; i < optind; i++)
 783                 nargv[nargc++] = orig_argv[i];
 784         for(int i = 1; i < argc; i++)
 785                 nargv[nargc++] = argv[i];
 786
 787 #ifdef HAVE_MINGW
 788         execvp(c, nargv);
 789         fprintf(stderr, "Error starting %s: %s\n", c, strerror(errno));
 790         return 1;
 791 #else
 792         pid_t pid = fork();
 793         if(pid == -1) {
 794                 fprintf(stderr, "Could not fork: %s\n", strerror(errno));
 795                 free(nargv);
 796                 return 1;
 797         }
 798
 799         if(!pid)
 800                 exit(execvp(c, nargv));
 801
 802         free(nargv);
 803
 804         int status = -1;
 805         if(waitpid(pid, &status, 0) != pid || !WIFEXITED(status) || WEXITSTATUS(status)) {
 806                 fprintf(stderr, "Error starting %s\n", c);
 807                 return 1;
 808         }
 809
 810         return 0;
 811 #endif
 812 }
 813
 814 static int cmd_stop(int argc, char *argv[]) {
 815         if(argc > 1) {
 816                 fprintf(stderr, "Too many arguments!\n");
 817                 return 1;
 818         }
 819
 820 #ifndef HAVE_MINGW
 821         if(!connect_tincd(true)) {
 822                 if(pid) {
 823                         if(kill(pid, SIGTERM)) {
 824                                 fprintf(stderr, "Could not send TERM signal to process with PID %u: %s\n", pid, strerror(errno));
 825                                 return 1;
 826                         }
 827
 828                         fprintf(stderr, "Sent TERM signal to process with PID %u.\n", pid);
 829                         waitpid(pid, NULL, 0);
 830                         return 0;
 831                 }
 832
 833                 return 1;
 834         }
 835
 836         sendline(fd, "%d %d", CONTROL, REQ_STOP);
 837
 838         while(recvline(fd, line, sizeof line)) {
 839                 // Wait for tincd to close the connection...
 840         }
 841 #else
 842         if(!remove_service())
 843                 return 1;
 844 #endif
 845         close(fd);
 846         pid = 0;
 847         fd = -1;
 848
 849         return 0;
 850 }
 851
 852 static int cmd_restart(int argc, char *argv[]) {
 853         cmd_stop(argc, argv);
 854         return cmd_start(argc, argv);
 855 }
 856
 857 static int cmd_reload(int argc, char *argv[]) {
 858         if(argc > 1) {
 859                 fprintf(stderr, "Too many arguments!\n");
 860                 return 1;
 861         }
 862
 863         if(!connect_tincd(true))
 864                 return 1;
 865
 866         sendline(fd, "%d %d", CONTROL, REQ_RELOAD);
 867         if(!recvline(fd, line, sizeof line) || sscanf(line, "%d %d %d", &code, &req, &result) != 3 || code != CONTROL || req != REQ_RELOAD || result) {
 868                 fprintf(stderr, "Could not reload configuration.\n");
 869                 return 1;
 870         }
 871
 872         return 0;
 873
 874 }
 875
 876 static int cmd_dump(int argc, char *argv[]) {
 877         bool only_reachable = false;
 878
 879         if(argc > 2 && !strcasecmp(argv[1], "reachable")) {
 880                 if(strcasecmp(argv[2], "nodes")) {
 881                         fprintf(stderr, "`reachable' only supported for nodes.\n");
 882                         usage(true);
 883                         return 1;
 884                 }
 885                 only_reachable = true;
 886                 argv++;
 887                 argc--;
 888         }
 889
 890         if(argc != 2) {
 891                 fprintf(stderr, "Invalid number of arguments.\n");
 892                 usage(true);
 893                 return 1;
 894         }
 895
 896         if(!connect_tincd(true))
 897                 return 1;
 898
 899         int do_graph = 0;
 900
 901         if(!strcasecmp(argv[1], "nodes"))
 902                 sendline(fd, "%d %d", CONTROL, REQ_DUMP_NODES);
 903         else if(!strcasecmp(argv[1], "edges"))
 904                 sendline(fd, "%d %d", CONTROL, REQ_DUMP_EDGES);
 905         else if(!strcasecmp(argv[1], "subnets"))
 906                 sendline(fd, "%d %d", CONTROL, REQ_DUMP_SUBNETS);
 907         else if(!strcasecmp(argv[1], "connections"))
 908                 sendline(fd, "%d %d", CONTROL, REQ_DUMP_CONNECTIONS);
 909         else if(!strcasecmp(argv[1], "graph")) {
 910                 sendline(fd, "%d %d", CONTROL, REQ_DUMP_NODES);
 911                 sendline(fd, "%d %d", CONTROL, REQ_DUMP_EDGES);
 912                 do_graph = 1;
 913         } else if(!strcasecmp(argv[1], "digraph")) {
 914                 sendline(fd, "%d %d", CONTROL, REQ_DUMP_NODES);
 915                 sendline(fd, "%d %d", CONTROL, REQ_DUMP_EDGES);
 916                 do_graph = 2;
 917         } else {
 918                 fprintf(stderr, "Unknown dump type '%s'.\n", argv[1]);
 919                 usage(true);
 920                 return 1;
 921         }
 922
 923         if(do_graph == 1)
 924                 printf("graph {\n");
 925         else if(do_graph == 2)
 926                 printf("digraph {\n");
 927
 928         while(recvline(fd, line, sizeof line)) {
 929                 char node1[4096], node2[4096];
 930                 int n = sscanf(line, "%d %d %s %s", &code, &req, node1, node2);
 931                 if(n == 2) {
 932                         if(do_graph && req == REQ_DUMP_NODES)
 933                                 continue;
 934                         else {
 935                                 if(do_graph)
 936                                         printf("}\n");
 937                                 return 0;
 938                         }
 939                 }
 940                 if(n < 2)
 941                         break;
 942
 943                 char node[4096];
 944                 char from[4096];
 945                 char to[4096];
 946                 char subnet[4096];
 947                 char host[4096];
 948                 char port[4096];
 949                 char via[4096];
 950                 char nexthop[4096];
 951                 int cipher, digest, maclength, compression, distance, socket, weight;
 952                 short int pmtu, minmtu, maxmtu;
 953                 unsigned int options, status_int;
 954                 node_status_t status;
 955                 long int last_state_change;
 956
 957                 switch(req) {
 958                         case REQ_DUMP_NODES: {
 959                                 int n = sscanf(line, "%*d %*d %s %s port %s %d %d %d %d %x %x %s %s %d %hd %hd %hd %ld", node, host, port, &cipher, &digest, &maclength, &compression, &options, &status_int, nexthop, via, &distance, &pmtu, &minmtu, &maxmtu, &last_state_change);
 960                                 if(n != 16) {
 961                                         fprintf(stderr, "Unable to parse node dump from tincd: %s\n", line);
 962                                         return 1;
 963                                 }
 964
 965                                 memcpy(&status, &status_int, sizeof status);
 966
 967                                 if(do_graph) {
 968                                         const char *color = "black";
 969                                         if(!strcmp(host, "MYSELF"))
 970                                                 color = "green";
 971                                         else if(!status.reachable)
 972                                                 color = "red";
 973                                         else if(strcmp(via, node))
 974                                                 color = "orange";
 975                                         else if(!status.validkey)
 976                                                 color = "black";
 977                                         else if(minmtu > 0)
 978                                                 color = "green";
 979                                         printf(" %s [label = \"%s\", color = \"%s\"%s];\n", node, node, color, strcmp(host, "MYSELF") ? "" : ", style = \"filled\"");
 980                                 } else {
 981                                         if(only_reachable && !status.reachable)
 982                                                 continue;
 983                                         printf("%s at %s port %s cipher %d digest %d maclength %d compression %d options %x status %04x nexthop %s via %s distance %d pmtu %hd (min %hd max %hd)\n",
 984                                                         node, host, port, cipher, digest, maclength, compression, options, status_int, nexthop, via, distance, pmtu, minmtu, maxmtu);
 985                                 }
 986                         } break;
 987
 988                         case REQ_DUMP_EDGES: {
 989                                 int n = sscanf(line, "%*d %*d %s %s %s port %s %x %d", from, to, host, port, &options, &weight);
 990                                 if(n != 6) {
 991                                         fprintf(stderr, "Unable to parse edge dump from tincd.\n");
 992                                         return 1;
 993                                 }
 994
 995                                 if(do_graph) {
 996                                         float w = 1 + 65536.0 / weight;
 997                                         if(do_graph == 1 && strcmp(node1, node2) > 0)
 998                                                 printf(" %s -- %s [w = %f, weight = %f];\n", node1, node2, w, w);
 999                                         else if(do_graph == 2)
1000                                                 printf(" %s -> %s [w = %f, weight = %f];\n", node1, node2, w, w);
1001                                 } else {
1002                                         printf("%s to %s at %s port %s options %x weight %d\n", from, to, host, port, options, weight);
1003                                 }
1004                         } break;
1005
1006                         case REQ_DUMP_SUBNETS: {
1007                                 int n = sscanf(line, "%*d %*d %s %s", subnet, node);
1008                                 if(n != 2) {
1009                                         fprintf(stderr, "Unable to parse subnet dump from tincd.\n");
1010                                         return 1;
1011                                 }
1012                                 printf("%s owner %s\n", strip_weight(subnet), node);
1013                         } break;
1014
1015                         case REQ_DUMP_CONNECTIONS: {
1016                                 int n = sscanf(line, "%*d %*d %s %s port %s %x %d %x", node, host, port, &options, &socket, &status_int);
1017                                 if(n != 6) {
1018                                         fprintf(stderr, "Unable to parse connection dump from tincd.\n");
1019                                         return 1;
1020                                 }
1021                                 printf("%s at %s port %s options %x socket %d status %x\n", node, host, port, options, socket, status_int);
1022                         } break;
1023
1024                         default:
1025                                 fprintf(stderr, "Unable to parse dump from tincd.\n");
1026                                 return 1;
1027                 }
1028         }
1029
1030         fprintf(stderr, "Error receiving dump.\n");
1031         return 1;
1032 }
1033
1034 static int cmd_purge(int argc, char *argv[]) {
1035         if(argc > 1) {
1036                 fprintf(stderr, "Too many arguments!\n");
1037                 return 1;
1038         }
1039
1040         if(!connect_tincd(true))
1041                 return 1;
1042
1043         sendline(fd, "%d %d", CONTROL, REQ_PURGE);
1044         if(!recvline(fd, line, sizeof line) || sscanf(line, "%d %d %d", &code, &req, &result) != 3 || code != CONTROL || req != REQ_PURGE || result) {
1045                 fprintf(stderr, "Could not purge old information.\n");
1046                 return 1;
1047         }
1048
1049         return 0;
1050 }
1051
1052 static int cmd_debug(int argc, char *argv[]) {
1053         if(argc != 2) {
1054                 fprintf(stderr, "Invalid number of arguments.\n");
1055                 return 1;
1056         }
1057
1058         if(!connect_tincd(true))
1059                 return 1;
1060
1061         int debuglevel = atoi(argv[1]);
1062         int origlevel;
1063
1064         sendline(fd, "%d %d %d", CONTROL, REQ_SET_DEBUG, debuglevel);
1065         if(!recvline(fd, line, sizeof line) || sscanf(line, "%d %d %d", &code, &req, &origlevel) != 3 || code != CONTROL || req != REQ_SET_DEBUG) {
1066                 fprintf(stderr, "Could not set debug level.\n");
1067                 return 1;
1068         }
1069
1070         fprintf(stderr, "Old level %d, new level %d.\n", origlevel, debuglevel);
1071         return 0;
1072 }
1073
1074 static int cmd_retry(int argc, char *argv[]) {
1075         if(argc > 1) {
1076                 fprintf(stderr, "Too many arguments!\n");
1077                 return 1;
1078         }
1079
1080         if(!connect_tincd(true))
1081                 return 1;
1082
1083         sendline(fd, "%d %d", CONTROL, REQ_RETRY);
1084         if(!recvline(fd, line, sizeof line) || sscanf(line, "%d %d %d", &code, &req, &result) != 3 || code != CONTROL || req != REQ_RETRY || result) {
1085                 fprintf(stderr, "Could not retry outgoing connections.\n");
1086                 return 1;
1087         }
1088
1089         return 0;
1090 }
1091
1092 static int cmd_connect(int argc, char *argv[]) {
1093         if(argc != 2) {
1094                 fprintf(stderr, "Invalid number of arguments.\n");
1095                 return 1;
1096         }
1097
1098         if(!check_id(argv[1])) {
1099                 fprintf(stderr, "Invalid name for node.\n");
1100                 return 1;
1101         }
1102
1103         if(!connect_tincd(true))
1104                 return 1;
1105
1106         sendline(fd, "%d %d %s", CONTROL, REQ_CONNECT, argv[1]);
1107         if(!recvline(fd, line, sizeof line) || sscanf(line, "%d %d %d", &code, &req, &result) != 3 || code != CONTROL || req != REQ_CONNECT || result) {
1108                 fprintf(stderr, "Could not connect to %s.\n", argv[1]);
1109                 return 1;
1110         }
1111
1112         return 0;
1113 }
1114
1115 static int cmd_disconnect(int argc, char *argv[]) {
1116         if(argc != 2) {
1117                 fprintf(stderr, "Invalid number of arguments.\n");
1118                 return 1;
1119         }
1120
1121         if(!check_id(argv[1])) {
1122                 fprintf(stderr, "Invalid name for node.\n");
1123                 return 1;
1124         }
1125
1126         if(!connect_tincd(true))
1127                 return 1;
1128
1129         sendline(fd, "%d %d %s", CONTROL, REQ_DISCONNECT, argv[1]);
1130         if(!recvline(fd, line, sizeof line) || sscanf(line, "%d %d %d", &code, &req, &result) != 3 || code != CONTROL || req != REQ_DISCONNECT || result) {
1131                 fprintf(stderr, "Could not disconnect %s.\n", argv[1]);
1132                 return 1;
1133         }
1134
1135         return 0;
1136 }
1137
1138 static int cmd_top(int argc, char *argv[]) {
1139         if(argc > 1) {
1140                 fprintf(stderr, "Too many arguments!\n");
1141                 return 1;
1142         }
1143
1144 #ifdef HAVE_CURSES
1145         if(!connect_tincd(true))
1146                 return 1;
1147
1148         top(fd);
1149         return 0;
1150 #else
1151         fprintf(stderr, "This version of tincctl was compiled without support for the curses library.\n");
1152         return 1;
1153 #endif
1154 }
1155
1156 static int cmd_pcap(int argc, char *argv[]) {
1157         if(argc > 2) {
1158                 fprintf(stderr, "Too many arguments!\n");
1159                 return 1;
1160         }
1161
1162         if(!connect_tincd(true))
1163                 return 1;
1164
1165         pcap(fd, stdout, argc > 1 ? atoi(argv[1]) : 0);
1166         return 0;
1167 }
1168
1169 static int cmd_log(int argc, char *argv[]) {
1170         if(argc > 2) {
1171                 fprintf(stderr, "Too many arguments!\n");
1172                 return 1;
1173         }
1174
1175         if(!connect_tincd(true))
1176                 return 1;
1177
1178         logcontrol(fd, stdout, argc > 1 ? atoi(argv[1]) : -1);
1179         return 0;
1180 }
1181
1182 static int cmd_pid(int argc, char *argv[]) {
1183         if(argc > 1) {
1184                 fprintf(stderr, "Too many arguments!\n");
1185                 return 1;
1186         }
1187
1188         if(!connect_tincd(true) && !pid)
1189                 return 1;
1190
1191         printf("%d\n", pid);
1192         return 0;
1193 }
1194
1195 static int rstrip(char *value) {
1196         int len = strlen(value);
1197         while(len && strchr("\t\r\n ", value[len - 1]))
1198                 value[--len] = 0;
1199         return len;
1200 }
1201
1202 static char *get_my_name() {
1203         FILE *f = fopen(tinc_conf, "r");
1204         if(!f) {
1205                 fprintf(stderr, "Could not open %s: %s\n", tinc_conf, strerror(errno));
1206                 return NULL;
1207         }
1208
1209         char buf[4096];
1210         char *value;
1211         while(fgets(buf, sizeof buf, f)) {
1212                 int len = strcspn(buf, "\t =");
1213                 value = buf + len;
1214                 value += strspn(value, "\t ");
1215                 if(*value == '=') {
1216                         value++;
1217                         value += strspn(value, "\t ");
1218                 }
1219                 if(!rstrip(value))
1220                         continue;
1221                 buf[len] = 0;
1222                 if(strcasecmp(buf, "Name"))
1223                         continue;
1224                 if(*value) {
1225                         fclose(f);
1226                         return strdup(value);
1227                 }
1228         }
1229
1230         fclose(f);
1231         fprintf(stderr, "Could not find Name in %s.\n", tinc_conf);
1232         return NULL;
1233 }
1234
1235 #define VAR_SERVER 1    /* Should be in tinc.conf */
1236 #define VAR_HOST 2      /* Can be in host config file */
1237 #define VAR_MULTIPLE 4  /* Multiple statements allowed */
1238 #define VAR_OBSOLETE 8  /* Should not be used anymore */
1239
1240 static struct {
1241         const char *name;
1242         int type;
1243 } const variables[] = {
1244         /* Server configuration */
1245         {"AddressFamily", VAR_SERVER},
1246         {"AutoConnect", VAR_SERVER},
1247         {"BindToAddress", VAR_SERVER | VAR_MULTIPLE},
1248         {"BindToInterface", VAR_SERVER},
1249         {"Broadcast", VAR_SERVER},
1250         {"ConnectTo", VAR_SERVER | VAR_MULTIPLE},
1251         {"DecrementTTL", VAR_SERVER},
1252         {"Device", VAR_SERVER},
1253         {"DeviceType", VAR_SERVER},
1254         {"DirectOnly", VAR_SERVER},
1255         {"ECDSAPrivateKeyFile", VAR_SERVER},
1256         {"ExperimentalProtocol", VAR_SERVER},
1257         {"Forwarding", VAR_SERVER},
1258         {"GraphDumpFile", VAR_SERVER | VAR_OBSOLETE},
1259         {"Hostnames", VAR_SERVER},
1260         {"IffOneQueue", VAR_SERVER},
1261         {"Interface", VAR_SERVER},
1262         {"KeyExpire", VAR_SERVER},
1263         {"LocalDiscovery", VAR_SERVER},
1264         {"MACExpire", VAR_SERVER},
1265         {"MaxOutputBufferSize", VAR_SERVER},
1266         {"MaxTimeout", VAR_SERVER},
1267         {"Mode", VAR_SERVER},
1268         {"Name", VAR_SERVER},
1269         {"PingInterval", VAR_SERVER},
1270         {"PingTimeout", VAR_SERVER},
1271         {"PriorityInheritance", VAR_SERVER},
1272         {"PrivateKey", VAR_SERVER | VAR_OBSOLETE},
1273         {"PrivateKeyFile", VAR_SERVER},
1274         {"ProcessPriority", VAR_SERVER},
1275         {"Proxy", VAR_SERVER},
1276         {"ReplayWindow", VAR_SERVER},
1277         {"ScriptsExtension", VAR_SERVER},
1278         {"ScriptsInterpreter", VAR_SERVER},
1279         {"StrictSubnets", VAR_SERVER},
1280         {"TunnelServer", VAR_SERVER},
1281         {"UDPRcvBuf", VAR_SERVER},
1282         {"UDPSndBuf", VAR_SERVER},
1283         {"VDEGroup", VAR_SERVER},
1284         {"VDEPort", VAR_SERVER},
1285         /* Host configuration */
1286         {"Address", VAR_HOST | VAR_MULTIPLE},
1287         {"Cipher", VAR_SERVER | VAR_HOST},
1288         {"ClampMSS", VAR_SERVER | VAR_HOST},
1289         {"Compression", VAR_SERVER | VAR_HOST},
1290         {"Digest", VAR_SERVER | VAR_HOST},
1291         {"ECDSAPublicKey", VAR_HOST},
1292         {"ECDSAPublicKeyFile", VAR_SERVER | VAR_HOST},
1293         {"IndirectData", VAR_SERVER | VAR_HOST},
1294         {"MACLength", VAR_SERVER | VAR_HOST},
1295         {"PMTU", VAR_SERVER | VAR_HOST},
1296         {"PMTUDiscovery", VAR_SERVER | VAR_HOST},
1297         {"Port", VAR_HOST},
1298         {"PublicKey", VAR_HOST | VAR_OBSOLETE},
1299         {"PublicKeyFile", VAR_SERVER | VAR_HOST | VAR_OBSOLETE},
1300         {"Subnet", VAR_HOST | VAR_MULTIPLE},
1301         {"TCPOnly", VAR_SERVER | VAR_HOST},
1302         {"Weight", VAR_HOST},
1303         {NULL, 0}
1304 };
1305
1306 static int cmd_config(int argc, char *argv[]) {
1307         if(argc < 2) {
1308                 fprintf(stderr, "Invalid number of arguments.\n");
1309                 return 1;
1310         }
1311
1312         int action = -2;
1313         if(!strcasecmp(argv[1], "get")) {
1314                 argv++, argc--;
1315         } else if(!strcasecmp(argv[1], "add")) {
1316                 argv++, argc--, action = 1;
1317         } else if(!strcasecmp(argv[1], "del")) {
1318                 argv++, argc--, action = -1;
1319         } else if(!strcasecmp(argv[1], "replace") || !strcasecmp(argv[1], "set") || !strcasecmp(argv[1], "change")) {
1320                 argv++, argc--, action = 0;
1321         }
1322
1323         if(argc < 2) {
1324                 fprintf(stderr, "Invalid number of arguments.\n");
1325                 return 1;
1326         }
1327
1328         // Concatenate the rest of the command line
1329         strncpy(line, argv[1], sizeof line - 1);
1330         for(int i = 2; i < argc; i++) {
1331                 strncat(line, " ", sizeof line - 1 - strlen(line));
1332                 strncat(line, argv[i], sizeof line - 1 - strlen(line));
1333         }
1334
1335         // Liberal parsing into node name, variable name and value.
1336         char *node = NULL;
1337         char *variable;
1338         char *value;
1339         int len;
1340
1341         len = strcspn(line, "\t =");
1342         value = line + len;
1343         value += strspn(value, "\t ");
1344         if(*value == '=') {
1345                 value++;
1346                 value += strspn(value, "\t ");
1347         }
1348         line[len] = '\0';
1349         variable = strchr(line, '.');
1350         if(variable) {
1351                 node = line;
1352                 *variable++ = 0;
1353         } else {
1354                 variable = line;
1355         }
1356
1357         if(!*variable) {
1358                 fprintf(stderr, "No variable given.\n");
1359                 return 1;
1360         }
1361
1362         if(action >= 0 && !*value) {
1363                 fprintf(stderr, "No value for variable given.\n");
1364                 return 1;
1365         }
1366
1367         if(action < -1 && *value)
1368                 action = 0;
1369
1370         /* Some simple checks. */
1371         bool found = false;
1372
1373         for(int i = 0; variables[i].name; i++) {
1374                 if(strcasecmp(variables[i].name, variable))
1375                         continue;
1376
1377                 found = true;
1378                 variable = (char *)variables[i].name;
1379
1380                 /* Discourage use of obsolete variables. */
1381
1382                 if(variables[i].type & VAR_OBSOLETE && action >= 0) {
1383                         if(force) {
1384                                 fprintf(stderr, "Warning: %s is an obsolete variable!\n", variable);
1385                         } else {
1386                                 fprintf(stderr, "%s is an obsolete variable! Use --force to use it anyway.\n", variable);
1387                                 return 1;
1388                         }
1389                 }
1390
1391                 /* Don't put server variables in host config files */
1392
1393                 if(node && !(variables[i].type & VAR_HOST) && action >= 0) {
1394                         if(force) {
1395                                 fprintf(stderr, "Warning: %s is not a host configuration variable!\n", variable);
1396                         } else {
1397                                 fprintf(stderr, "%s is not a host configuration variable! Use --force to use it anyway.\n", variable);
1398                                 return 1;
1399                         }
1400                 }
1401
1402                 /* Should this go into our own host config file? */
1403
1404                 if(!node && !(variables[i].type & VAR_SERVER)) {
1405                         node = get_my_name();
1406                         if(!node)
1407                                 return 1;
1408                 }
1409
1410                 break;
1411         }
1412
1413         if(node && !check_id(node)) {
1414                 fprintf(stderr, "Invalid name for node.\n");
1415                 return 1;
1416         }
1417
1418         if(!found) {
1419                 if(force || action < 0) {
1420                         fprintf(stderr, "Warning: %s is not a known configuration variable!\n", variable);
1421                 } else {
1422                         fprintf(stderr, "%s: is not a known configuration variable! Use --force to use it anyway.\n", variable);
1423                         return 1;
1424                 }
1425         }
1426
1427         // Open the right configuration file.
1428         char *filename;
1429         if(node)
1430                 xasprintf(&filename, "%s" SLASH "%s", hosts_dir, node);
1431         else
1432                 filename = tinc_conf;
1433
1434         FILE *f = fopen(filename, "r");
1435         if(!f) {
1436                 if(action < 0 || errno != ENOENT) {
1437                         fprintf(stderr, "Could not open configuration file %s: %s\n", filename, strerror(errno));
1438                         return 1;
1439                 }
1440
1441                 // If it doesn't exist, create it.
1442                 f = fopen(filename, "a+");
1443                 if(!f) {
1444                         fprintf(stderr, "Could not create configuration file %s: %s\n", filename, strerror(errno));
1445                         return 1;
1446                 } else {
1447                         fprintf(stderr, "Created configuration file %s.\n", filename);
1448                 }
1449         }
1450
1451         char *tmpfile = NULL;
1452         FILE *tf = NULL;
1453
1454         if(action >= -1) {
1455                 xasprintf(&tmpfile, "%s.config.tmp", filename);
1456                 tf = fopen(tmpfile, "w");
1457                 if(!tf) {
1458                         fprintf(stderr, "Could not open temporary file %s: %s\n", tmpfile, strerror(errno));
1459                         fclose(f);
1460                         return 1;
1461                 }
1462         }
1463
1464         // Copy the file, making modifications on the fly, unless we are just getting a value.
1465         char buf1[4096];
1466         char buf2[4096];
1467         bool set = false;
1468         bool removed = false;
1469         found = false;
1470
1471         while(fgets(buf1, sizeof buf1, f)) {
1472                 buf1[sizeof buf1 - 1] = 0;
1473                 strncpy(buf2, buf1, sizeof buf2);
1474
1475                 // Parse line in a simple way
1476                 char *bvalue;
1477                 int len;
1478
1479                 len = strcspn(buf2, "\t =");
1480                 bvalue = buf2 + len;
1481                 bvalue += strspn(bvalue, "\t ");
1482                 if(*bvalue == '=') {
1483                         bvalue++;
1484                         bvalue += strspn(bvalue, "\t ");
1485                 }
1486                 rstrip(bvalue);
1487                 buf2[len] = '\0';
1488
1489                 // Did it match?
1490                 if(!strcasecmp(buf2, variable)) {
1491                         // Get
1492                         if(action < -1) {
1493                                 found = true;
1494                                 printf("%s\n", bvalue);
1495                         // Del
1496                         } else if(action == -1) {
1497                                 if(!*value || !strcasecmp(bvalue, value)) {
1498                                         removed = true;
1499                                         continue;
1500                                 }
1501                         // Set
1502                         } else if(action == 0) {
1503                                 // Already set? Delete the rest...
1504                                 if(set)
1505                                         continue;
1506                                 // Otherwise, replace.
1507                                 if(fprintf(tf, "%s = %s\n", variable, value) < 0) {
1508                                         fprintf(stderr, "Error writing to temporary file %s: %s\n", tmpfile, strerror(errno));
1509                                         return 1;
1510                                 }
1511                                 set = true;
1512                                 continue;
1513                         }
1514                 }
1515
1516                 if(action >= -1) {
1517                         // Copy original line...
1518                         if(fputs(buf1, tf) < 0) {
1519                                 fprintf(stderr, "Error writing to temporary file %s: %s\n", tmpfile, strerror(errno));
1520                                 return 1;
1521                         }
1522
1523                         // Add newline if it is missing...
1524                         if(*buf1 && buf1[strlen(buf1) - 1] != '\n') {
1525                                 if(fputc('\n', tf) < 0) {
1526                                         fprintf(stderr, "Error writing to temporary file %s: %s\n", tmpfile, strerror(errno));
1527                                         return 1;
1528                                 }
1529                         }
1530                 }
1531         }
1532
1533         // Make sure we read everything...
1534         if(ferror(f) || !feof(f)) {
1535                 fprintf(stderr, "Error while reading from configuration file %s: %s\n", filename, strerror(errno));
1536                 return 1;
1537         }
1538
1539         if(fclose(f)) {
1540                 fprintf(stderr, "Error closing configuration file %s: %s\n", filename, strerror(errno));
1541                 return 1;
1542         }
1543
1544         // Add new variable if necessary.
1545         if(action > 0 || (action == 0 && !set)) {
1546                 if(fprintf(tf, "%s = %s\n", variable, value) < 0) {
1547                         fprintf(stderr, "Error writing to temporary file %s: %s\n", tmpfile, strerror(errno));
1548                         return 1;
1549                 }
1550         }
1551
1552         if(action < -1) {
1553                 if(!found)
1554                         fprintf(stderr, "No matching configuration variables found.\n");
1555                 return 0;
1556         }
1557
1558         // Make sure we wrote everything...
1559         if(fclose(tf)) {
1560                 fprintf(stderr, "Error closing temporary file %s: %s\n", tmpfile, strerror(errno));
1561                 return 1;
1562         }
1563
1564         // Could we find what we had to remove?
1565         if(action < 0 && !removed) {
1566                 remove(tmpfile);
1567                 fprintf(stderr, "No configuration variables deleted.\n");
1568                 return *value;
1569         }
1570
1571         // Replace the configuration file with the new one
1572 #ifdef HAVE_MINGW
1573         if(remove(filename)) {
1574                 fprintf(stderr, "Error replacing file %s: %s\n", filename, strerror(errno));
1575                 return 1;
1576         }
1577 #endif
1578         if(rename(tmpfile, filename)) {
1579                 fprintf(stderr, "Error renaming temporary file %s to configuration file %s: %s\n", tmpfile, filename, strerror(errno));
1580                 return 1;
1581         }
1582
1583         // Silently try notifying a running tincd of changes.
1584         if(connect_tincd(false))
1585                 sendline(fd, "%d %d", CONTROL, REQ_RELOAD);
1586
1587         return 0;
1588 }
1589
1590 bool check_id(const char *name) {
1591         if(!name || !*name)
1592                 return false;
1593
1594         for(int i = 0; i < strlen(name); i++) {
1595                 if(!isalnum(name[i]) && name[i] != '_')
1596                         return false;
1597         }
1598
1599         return true;
1600 }
1601
1602 static int cmd_init(int argc, char *argv[]) {
1603         if(!access(tinc_conf, F_OK)) {
1604                 fprintf(stderr, "Configuration file %s already exists!\n", tinc_conf);
1605                 return 1;
1606         }
1607
1608         if(argc > 2) {
1609                 fprintf(stderr, "Too many arguments!\n");
1610                 return 1;
1611         } else if(argc < 2) {
1612                 if(tty) {
1613                         char buf[1024];
1614                         fprintf(stdout, "Enter the Name you want your tinc node to have: ");
1615                         fflush(stdout);
1616                         if(!fgets(buf, sizeof buf, stdin)) {
1617                                 fprintf(stderr, "Error while reading stdin: %s\n", strerror(errno));
1618                                 return 1;
1619                         }
1620                         int len = rstrip(buf);
1621                         if(!len) {
1622                                 fprintf(stderr, "No name given!\n");
1623                                 return 1;
1624                         }
1625                         name = strdup(buf);
1626                 } else {
1627                         fprintf(stderr, "No Name given!\n");
1628                         return 1;
1629                 }
1630         } else {
1631                 name = strdup(argv[1]);
1632                 if(!*name) {
1633                         fprintf(stderr, "No Name given!\n");
1634                         return 1;
1635                 }
1636         }
1637
1638         if(!check_id(name)) {
1639                 fprintf(stderr, "Invalid Name! Only a-z, A-Z, 0-9 and _ are allowed characters.\n");
1640                 return 1;
1641         }
1642
1643         if(mkdir(confdir, 0755) && errno != EEXIST) {
1644                 fprintf(stderr, "Could not create directory %s: %s\n", CONFDIR, strerror(errno));
1645                 return 1;
1646         }
1647
1648         if(mkdir(confbase, 0755) && errno != EEXIST) {
1649                 fprintf(stderr, "Could not create directory %s: %s\n", confbase, strerror(errno));
1650                 return 1;
1651         }
1652
1653         if(mkdir(hosts_dir, 0755) && errno != EEXIST) {
1654                 fprintf(stderr, "Could not create directory %s: %s\n", hosts_dir, strerror(errno));
1655                 return 1;
1656         }
1657
1658         FILE *f = fopen(tinc_conf, "w");
1659         if(!f) {
1660                 fprintf(stderr, "Could not create file %s: %s\n", tinc_conf, strerror(errno));
1661                 return 1;
1662         }
1663
1664         fprintf(f, "Name = %s\n", name);
1665         fclose(f);
1666
1667         if(!rsa_keygen(2048, false) || !ecdsa_keygen(false))
1668                 return 1;
1669
1670 #ifndef HAVE_MINGW
1671         char *filename;
1672         xasprintf(&filename, "%s" SLASH "tinc-up", confbase);
1673         if(access(filename, F_OK)) {
1674                 FILE *f = fopen(filename, "w");
1675                 if(!f) {
1676                         fprintf(stderr, "Could not create file %s: %s\n", filename, strerror(errno));
1677                         return 1;
1678                 }
1679                 fchmod(fileno(f), 0755);
1680                 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");
1681                 fclose(f);
1682         }
1683 #endif
1684
1685         return 0;
1686
1687 }
1688
1689 static int cmd_generate_keys(int argc, char *argv[]) {
1690         if(argc > 2) {
1691                 fprintf(stderr, "Too many arguments!\n");
1692                 return 1;
1693         }
1694
1695         return !(rsa_keygen(argc > 1 ? atoi(argv[1]) : 2048, true) && ecdsa_keygen(true));
1696 }
1697
1698 static int cmd_generate_rsa_keys(int argc, char *argv[]) {
1699         if(argc > 2) {
1700                 fprintf(stderr, "Too many arguments!\n");
1701                 return 1;
1702         }
1703
1704         return !rsa_keygen(argc > 1 ? atoi(argv[1]) : 2048, true);
1705 }
1706
1707 static int cmd_generate_ecdsa_keys(int argc, char *argv[]) {
1708         if(argc > 1) {
1709                 fprintf(stderr, "Too many arguments!\n");
1710                 return 1;
1711         }
1712
1713         return !ecdsa_keygen(true);
1714 }
1715
1716 static int cmd_help(int argc, char *argv[]) {
1717         usage(false);
1718         return 0;
1719 }
1720
1721 static int cmd_version(int argc, char *argv[]) {
1722         if(argc > 1) {
1723                 fprintf(stderr, "Too many arguments!\n");
1724                 return 1;
1725         }
1726
1727         version();
1728         return 0;
1729 }
1730
1731 static int cmd_info(int argc, char *argv[]) {
1732         if(argc != 2) {
1733                 fprintf(stderr, "Invalid number of arguments.\n");
1734                 return 1;
1735         }
1736
1737         if(!connect_tincd(true))
1738                 return 1;
1739
1740         return info(fd, argv[1]);
1741 }
1742
1743 static const char *conffiles[] = {
1744         "tinc.conf",
1745         "tinc-up",
1746         "tinc-down",
1747         "subnet-up",
1748         "subnet-down",
1749         "host-up",
1750         "host-down",
1751         NULL,
1752 };
1753
1754 static int cmd_edit(int argc, char *argv[]) {
1755         if(argc != 2) {
1756                 fprintf(stderr, "Invalid number of arguments.\n");
1757                 return 1;
1758         }
1759
1760         char *filename = NULL;
1761
1762         if(strncmp(argv[1], "hosts" SLASH, 6)) {
1763                 for(int i = 0; conffiles[i]; i++) {
1764                         if(!strcmp(argv[1], conffiles[i])) {
1765                                 xasprintf(&filename, "%s" SLASH "%s", confbase, argv[1]);
1766                                 break;
1767                         }
1768                 }
1769         } else {
1770                 argv[1] += 6;
1771         }
1772
1773         if(!filename) {
1774                 xasprintf(&filename, "%s" SLASH "%s", hosts_dir, argv[1]);
1775                 char *dash = strchr(argv[1], '-');
1776                 if(dash) {
1777                         *dash++ = 0;
1778                         if((strcmp(dash, "up") && strcmp(dash, "down")) || !check_id(argv[1])) {
1779                                 fprintf(stderr, "Invalid configuration filename.\n");
1780                                 return 1;
1781                         }
1782                 }
1783         }
1784
1785         char *command;
1786 #ifndef HAVE_MINGW
1787         xasprintf(&command, "\"%s\" \"%s\"", getenv("VISUAL") ?: getenv("EDITOR") ?: "vi", filename);
1788 #else
1789         xasprintf(&command, "edit \"%s\"", filename);
1790 #endif
1791         int result = system(command);
1792         if(result)
1793                 return result;
1794
1795         // Silently try notifying a running tincd of changes.
1796         if(connect_tincd(false))
1797                 sendline(fd, "%d %d", CONTROL, REQ_RELOAD);
1798
1799         return 0;
1800 }
1801
1802 static int export(const char *name, FILE *out) {
1803         char *filename;
1804         xasprintf(&filename, "%s" SLASH "%s", hosts_dir, name);
1805         FILE *in = fopen(filename, "r");
1806         if(!in) {
1807                 fprintf(stderr, "Could not open configuration file %s: %s\n", filename, strerror(errno));
1808                 return 1;
1809         }
1810
1811         fprintf(out, "Name = %s\n", name);
1812         char buf[4096];
1813         while(fgets(buf, sizeof buf, in)) {
1814                 if(strcspn(buf, "\t =") != 4 || strncasecmp(buf, "Name", 4))
1815                         fputs(buf, out);
1816         }
1817
1818         if(ferror(in)) {
1819                 fprintf(stderr, "Error while reading configuration file %s: %s\n", filename, strerror(errno));
1820                 fclose(in);
1821                 return 1;
1822         }
1823
1824         fclose(in);
1825         return 0;
1826 }
1827
1828 static int cmd_export(int argc, char *argv[]) {
1829         if(argc > 1) {
1830                 fprintf(stderr, "Too many arguments!\n");
1831                 return 1;
1832         }
1833
1834         char *name = get_my_name();
1835         if(!name)
1836                 return 1;
1837
1838         int result = export(name, stdout);
1839         if(!tty)
1840                 fclose(stdout);
1841         return result;
1842 }
1843
1844 static int cmd_export_all(int argc, char *argv[]) {
1845         if(argc > 1) {
1846                 fprintf(stderr, "Too many arguments!\n");
1847                 return 1;
1848         }
1849
1850         DIR *dir = opendir(hosts_dir);
1851         if(!dir) {
1852                 fprintf(stderr, "Could not open host configuration directory %s: %s\n", hosts_dir, strerror(errno));
1853                 return 1;
1854         }
1855
1856         bool first = true;
1857         int result = 0;
1858         struct dirent *ent;
1859
1860         while((ent = readdir(dir))) {
1861                 if(!check_id(ent->d_name))
1862                         continue;
1863
1864                 if(first)
1865                         first = false;
1866                 else
1867                         printf("#---------------------------------------------------------------#\n");
1868
1869                 result |= export(ent->d_name, stdout);
1870         }
1871
1872         closedir(dir);
1873         if(!tty)
1874                 fclose(stdout);
1875         return result;
1876 }
1877
1878 static int cmd_import(int argc, char *argv[]) {
1879         if(argc > 1) {
1880                 fprintf(stderr, "Too many arguments!\n");
1881                 return 1;
1882         }
1883
1884         FILE *in = stdin;
1885         FILE *out = NULL;
1886
1887         char buf[4096];
1888         char name[4096];
1889         char *filename = NULL;
1890         int count = 0;
1891         bool firstline = true;
1892
1893         while(fgets(buf, sizeof buf, in)) {
1894                 if(sscanf(buf, "Name = %s", name) == 1) {
1895                         firstline = false;
1896
1897                         if(!check_id(name)) {
1898                                 fprintf(stderr, "Invalid Name in input!\n");
1899                                 return 1;
1900                         }
1901
1902                         if(out)
1903                                 fclose(out);
1904
1905                         free(filename);
1906                         xasprintf(&filename, "%s" SLASH "%s", hosts_dir, name);
1907
1908                         if(!force && !access(filename, F_OK)) {
1909                                 fprintf(stderr, "Host configuration file %s already exists, skipping.\n", filename);
1910                                 out = NULL;
1911                                 continue;
1912                         }
1913
1914                         out = fopen(filename, "w");
1915                         if(!out) {
1916                                 fprintf(stderr, "Error creating configuration file %s: %s\n", filename, strerror(errno));
1917                                 return 1;
1918                         }
1919
1920                         count++;
1921                         continue;
1922                 } else if(firstline) {
1923                         fprintf(stderr, "Junk at the beginning of the input, ignoring.\n");
1924                         firstline = false;
1925                 }
1926
1927
1928                 if(!strcmp(buf, "#---------------------------------------------------------------#\n"))
1929                         continue;
1930
1931                 if(out) {
1932                         if(fputs(buf, out) < 0) {
1933                                 fprintf(stderr, "Error writing to host configuration file %s: %s\n", filename, strerror(errno));
1934                                 return 1;
1935                         }
1936                 }
1937         }
1938
1939         if(out)
1940                 fclose(out);
1941
1942         if(count) {
1943                 fprintf(stderr, "Imported %d host configuration files.\n", count);
1944                 return 0;
1945         } else {
1946                 fprintf(stderr, "No host configuration files imported.\n");
1947                 return 1;
1948         }
1949 }
1950
1951 static int cmd_exchange(int argc, char *argv[]) {
1952         return cmd_export(argc, argv) ?: cmd_import(argc, argv);
1953 }
1954
1955 static int cmd_exchange_all(int argc, char *argv[]) {
1956         return cmd_export_all(argc, argv) ?: cmd_import(argc, argv);
1957 }
1958
1959 static const struct {
1960         const char *command;
1961         int (*function)(int argc, char *argv[]);
1962 } commands[] = {
1963         {"start", cmd_start},
1964         {"stop", cmd_stop},
1965         {"restart", cmd_restart},
1966         {"reload", cmd_reload},
1967         {"dump", cmd_dump},
1968         {"purge", cmd_purge},
1969         {"debug", cmd_debug},
1970         {"retry", cmd_retry},
1971         {"connect", cmd_connect},
1972         {"disconnect", cmd_disconnect},
1973         {"top", cmd_top},
1974         {"pcap", cmd_pcap},
1975         {"log", cmd_log},
1976         {"pid", cmd_pid},
1977         {"config", cmd_config},
1978         {"init", cmd_init},
1979         {"generate-keys", cmd_generate_keys},
1980         {"generate-rsa-keys", cmd_generate_rsa_keys},
1981         {"generate-ecdsa-keys", cmd_generate_ecdsa_keys},
1982         {"help", cmd_help},
1983         {"version", cmd_version},
1984         {"info", cmd_info},
1985         {"edit", cmd_edit},
1986         {"export", cmd_export},
1987         {"export-all", cmd_export_all},
1988         {"import", cmd_import},
1989         {"exchange", cmd_exchange},
1990         {"exchange-all", cmd_exchange_all},
1991         {NULL, NULL},
1992 };
1993
1994 #ifdef HAVE_READLINE
1995 static char *complete_command(const char *text, int state) {
1996         static int i;
1997
1998         if(!state)
1999                 i = 0;
2000         else
2001                 i++;
2002
2003         while(commands[i].command) {
2004                 if(!strncasecmp(commands[i].command, text, strlen(text)))
2005                         return xstrdup(commands[i].command);
2006                 i++;
2007         }
2008
2009         return NULL;
2010 }
2011
2012 static char *complete_dump(const char *text, int state) {
2013         const char *matches[] = {"reachable", "nodes", "edges", "subnets", "connections", "graph", NULL};
2014         static int i;
2015
2016         if(!state)
2017                 i = 0;
2018         else
2019                 i++;
2020
2021         while(matches[i]) {
2022                 if(!strncasecmp(matches[i], text, strlen(text)))
2023                         return xstrdup(matches[i]);
2024                 i++;
2025         }
2026
2027         return NULL;
2028 }
2029
2030 static char *complete_config(const char *text, int state) {
2031         const char *sub[] = {"get", "set", "add", "del"};
2032         static int i;
2033         if(!state) {
2034                 i = 0;
2035                 if(!strchr(rl_line_buffer + 7, ' '))
2036                         i = -4;
2037                 else {
2038                         bool found = false;
2039                         for(int i = 0; i < 4; i++) {
2040                                 if(!strncasecmp(rl_line_buffer + 7, sub[i], strlen(sub[i])) && rl_line_buffer[7 + strlen(sub[i])] == ' ') {
2041                                         found = true;
2042                                         break;
2043                                 }
2044                         }
2045                         if(!found)
2046                                 return NULL;
2047                 }
2048         } else {
2049                 i++;
2050         }
2051
2052         while(i < 0 || variables[i].name) {
2053                 if(i < 0 && !strncasecmp(sub[i + 4], text, strlen(text)))
2054                         return xstrdup(sub[i + 4]);
2055                 if(i >= 0) {
2056                         char *dot = strchr(text, '.');
2057                         if(dot) {
2058                                 if((variables[i].type & VAR_HOST) && !strncasecmp(variables[i].name, dot + 1, strlen(dot + 1))) {
2059                                         char *match;
2060                                         xasprintf(&match, "%.*s.%s", dot - text, text, variables[i].name);
2061                                         return match;
2062                                 }
2063                         } else {
2064                                 if(!strncasecmp(variables[i].name, text, strlen(text)))
2065                                         return xstrdup(variables[i].name);
2066                         }
2067                 }
2068                 i++;
2069         }
2070
2071         return NULL;
2072 }
2073
2074 static char *complete_info(const char *text, int state) {
2075         static int i;
2076         if(!state) {
2077                 i = 0;
2078                 if(!connect_tincd(false))
2079                         return NULL;
2080                 // Check the list of nodes
2081                 sendline(fd, "%d %d", CONTROL, REQ_DUMP_NODES);
2082                 sendline(fd, "%d %d", CONTROL, REQ_DUMP_SUBNETS);
2083         }
2084
2085         while(recvline(fd, line, sizeof line)) {
2086                 char item[4096];
2087                 int n = sscanf(line, "%d %d %s", &code, &req, item);
2088                 if(n == 2) {
2089                         i++;
2090                         if(i >= 2)
2091                                 break;
2092                         else
2093                                 continue;
2094                 }
2095
2096                 if(n != 3) {
2097                         fprintf(stderr, "Unable to parse dump from tincd, n = %d, i = %d.\n", n, i);
2098                         break;
2099                 }
2100
2101                 if(!strncmp(item, text, strlen(text)))
2102                         return xstrdup(strip_weight(item));
2103         }
2104
2105         return NULL;
2106 }
2107
2108 static char *complete_nothing(const char *text, int state) {
2109         return NULL;
2110 }
2111
2112 static char **completion (const char *text, int start, int end) {
2113         char **matches = NULL;
2114
2115         if(!start)
2116                 matches = rl_completion_matches(text, complete_command);
2117         else if(!strncasecmp(rl_line_buffer, "dump ", 5))
2118                 matches = rl_completion_matches(text, complete_dump);
2119         else if(!strncasecmp(rl_line_buffer, "config ", 7))
2120                 matches = rl_completion_matches(text, complete_config);
2121         else if(!strncasecmp(rl_line_buffer, "info ", 5))
2122                 matches = rl_completion_matches(text, complete_info);
2123
2124         return matches;
2125 }
2126 #endif
2127
2128 static int cmd_shell(int argc, char *argv[]) {
2129         char *prompt;
2130         xasprintf(&prompt, "%s> ", identname);
2131         int result = 0;
2132         char buf[4096];
2133         char *line = NULL;
2134         int maxargs = argc + 16;
2135         char **nargv = xmalloc(maxargs * sizeof *nargv);
2136
2137         for(int i = 0; i < argc; i++)
2138                 nargv[i] = argv[i];
2139
2140 #ifdef HAVE_READLINE
2141         rl_readline_name = "tinc";
2142         rl_completion_entry_function = complete_nothing;
2143         rl_attempted_completion_function = completion;
2144         rl_filename_completion_desired = 0;
2145         char *copy = NULL;
2146 #endif
2147
2148         while(true) {
2149 #ifdef HAVE_READLINE
2150                 if(tty) {
2151                         free(copy);
2152                         free(line);
2153                         rl_basic_word_break_characters = "\t\n ";
2154                         line = readline(prompt);
2155                         if(line)
2156                                 copy = xstrdup(line);
2157                 } else {
2158                         line = fgets(buf, sizeof buf, stdin);
2159                 }
2160 #else
2161                 if(tty)
2162                         fputs(prompt, stdout);
2163
2164                 line = fgets(buf, sizeof buf, stdin);
2165 #endif
2166
2167                 if(!line)
2168                         break;
2169
2170                 /* Ignore comments */
2171
2172                 if(*line == '#')
2173                         continue;
2174
2175                 /* Split */
2176
2177                 int nargc = argc;
2178                 char *p = line + strspn(line, " \t\n");
2179                 char *next = strtok(p, " \t\n");
2180
2181                 while(p && *p) {
2182                         if(nargc >= maxargs) {
2183                                 fprintf(stderr, "next %p '%s', p %p '%s'\n", next, next, p, p);
2184                                 abort();
2185                                 maxargs *= 2;
2186                                 nargv = xrealloc(nargv, maxargs * sizeof *nargv);
2187                         }
2188
2189                         nargv[nargc++] = p;
2190                         p = next;
2191                         next = strtok(NULL, " \t\n");
2192                 }
2193
2194                 if(nargc == argc)
2195                         continue;
2196
2197                 if(!strcasecmp(nargv[argc], "exit") || !strcasecmp(nargv[argc], "quit"))
2198                         return result;
2199
2200                 bool found = false;
2201
2202                 for(int i = 0; commands[i].command; i++) {
2203                         if(!strcasecmp(nargv[argc], commands[i].command)) {
2204                                 result |= commands[i].function(nargc - argc - 1, nargv + argc + 1);
2205                                 found = true;
2206                                 break;
2207                         }
2208                 }
2209
2210 #ifdef HAVE_READLINE
2211                 if(tty && found)
2212                         add_history(copy);
2213 #endif
2214
2215                 if(!found) {
2216                         fprintf(stderr, "Unknown command `%s'.\n", nargv[argc]);
2217                         result |= 1;
2218                 }
2219         }
2220
2221         free(nargv);
2222
2223         if(tty)
2224                 printf("\n");
2225         return result;
2226 }
2227
2228
2229 int main(int argc, char *argv[]) {
2230         program_name = argv[0];
2231         orig_argv = argv;
2232         orig_argc = argc;
2233
2234         if(!parse_options(argc, argv))
2235                 return 1;
2236
2237         make_names();
2238         xasprintf(&tinc_conf, "%s" SLASH "tinc.conf", confbase);
2239         xasprintf(&hosts_dir, "%s" SLASH "hosts", confbase);
2240
2241         if(show_version) {
2242                 version();
2243                 return 0;
2244         }
2245
2246         if(show_help) {
2247                 usage(false);
2248                 return 0;
2249         }
2250
2251         tty = isatty(0) && isatty(1);
2252
2253         if(optind >= argc)
2254                 return cmd_shell(argc, argv);
2255
2256         for(int i = 0; commands[i].command; i++) {
2257                 if(!strcasecmp(argv[optind], commands[i].command))
2258                         return commands[i].function(argc - optind, argv + optind);
2259         }
2260
2261         fprintf(stderr, "Unknown command `%s'.\n", argv[optind]);
2262         usage(true);
2263         return 1;
2264 }