tinc-vpn.org Git - tinc/blob - 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 "crypto.h"
  33 #include "ecdsagen.h"
  34 #include "info.h"
  35 #include "invitation.h"
  36 #include "names.h"
  37 #include "rsagen.h"
  38 #include "utils.h"
  39 #include "tincctl.h"
  40 #include "top.h"
  41
  42 #ifdef HAVE_MINGW
  43 #define mkdir(a, b) mkdir(a)
  44 #define SCRIPTEXTENSION ".bat"
  45 #else
  46 #define SCRIPTEXTENSION ""
  47 #endif
  48
  49 static char **orig_argv;
  50 static int orig_argc;
  51
  52 /* If nonzero, display usage information and exit. */
  53 static bool show_help = false;
  54
  55 /* If nonzero, print the version on standard output and exit.  */
  56 static bool show_version = false;
  57
  58 static char *name = NULL;
  59 static char controlcookie[1025];
  60 char *tinc_conf = NULL;
  61 char *hosts_dir = NULL;
  62 struct timeval now;
  63
  64 // Horrible global variables...
  65 static int pid = 0;
  66 int fd = -1;
  67 char line[4096];
  68 static int code;
  69 static int req;
  70 static int result;
  71 static bool force = false;
  72 bool tty = true;
  73 bool confbasegiven = false;
  74 bool netnamegiven = false;
  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         {"net", required_argument, NULL, 'n'},
  83         {"help", no_argument, NULL, 1},
  84         {"version", no_argument, NULL, 2},
  85         {"pidfile", required_argument, NULL, 3},
  86         {"force", no_argument, NULL, 4},
  87         {NULL, 0, NULL, 0}
  88 };
  89
  90 static void version(void) {
  91         printf("%s version %s (built %s %s, protocol %d.%d)\n", PACKAGE,
  92                    VERSION, __DATE__, __TIME__, PROT_MAJOR, PROT_MINOR);
  93         printf("Copyright (C) 1998-2012 Ivo Timmermans, Guus Sliepen and others.\n"
  94                         "See the AUTHORS file for a complete list.\n\n"
  95                         "tinc comes with ABSOLUTELY NO WARRANTY.  This is free software,\n"
  96                         "and you are welcome to redistribute it under certain conditions;\n"
  97                         "see the file COPYING for details.\n");
  98 }
  99
 100 static void usage(bool status) {
 101         if(status) {
 102                 fprintf(stderr, "Try `%s --help\' for more information.\n", program_name);
 103         } else {
 104                 printf("Usage: %s [options] command\n\n", program_name);
 105                 printf("Valid options are:\n"
 106                                 "  -c, --config=DIR        Read configuration options from DIR.\n"
 107                                 "  -n, --net=NETNAME       Connect to net NETNAME.\n"
 108                                 "      --pidfile=FILENAME  Read control cookie from FILENAME.\n"
 109                                 "      --help              Display this help and exit.\n"
 110                                 "      --version           Output version information and exit.\n"
 111                                 "\n"
 112                                 "Valid commands are:\n"
 113                                 "  init [name]                Create initial configuration files.\n"
 114                                 "  get VARIABLE               Print current value of VARIABLE\n"
 115                                 "  set VARIABLE VALUE         Set VARIABLE to VALUE\n"
 116                                 "  add VARIABLE VALUE         Add VARIABLE with the given VALUE\n"
 117                                 "  del VARIABLE [VALUE]       Remove VARIABLE [only ones with watching VALUE]\n"
 118                                 "  start [tincd options]      Start tincd.\n"
 119                                 "  stop                       Stop tincd.\n"
 120                                 "  restart                    Restart tincd.\n"
 121                                 "  reload                     Partially reload configuration of running tincd.\n"
 122                                 "  pid                        Show PID of currently running tincd.\n"
 123                                 "  generate-keys [bits]       Generate new RSA and ECDSA public/private keypairs.\n"
 124                                 "  generate-rsa-keys [bits]   Generate a new RSA public/private keypair.\n"
 125                                 "  generate-ecdsa-keys        Generate a new ECDSA public/private keypair.\n"
 126                                 "  dump                       Dump a list of one of the following things:\n"
 127                                 "    [reachable] nodes        - all known nodes in the VPN\n"
 128                                 "    edges                    - all known connections in the VPN\n"
 129                                 "    subnets                  - all known subnets in the VPN\n"
 130                                 "    connections              - all meta connections with ourself\n"
 131                                 "    [di]graph                - graph of the VPN in dotty format\n"
 132                                 "  info NODE|SUBNET|ADDRESS   Give information about a particular NODE, SUBNET or ADDRESS.\n"
 133                                 "  purge                      Purge unreachable nodes\n"
 134                                 "  debug N                    Set debug level\n"
 135                                 "  retry                      Retry all outgoing connections\n"
 136                                 "  disconnect NODE            Close meta connection with NODE\n"
 137 #ifdef HAVE_CURSES
 138                                 "  top                        Show real-time statistics\n"
 139 #endif
 140                                 "  pcap [snaplen]             Dump traffic in pcap format [up to snaplen bytes per packet]\n"
 141                                 "  log [level]                Dump log output [up to the specified level]\n"
 142                                 "  export                     Export host configuration of local node to standard output\n"
 143                                 "  export-all                 Export all host configuration files to standard output\n"
 144                                 "  import [--force]           Import host configuration file(s) from standard input\n"
 145                                 "  exchange [--force]         Same as export followed by import\n"
 146                                 "  exchange-all [--force]     Same as export-all followed by import\n"
 147                                 "  invite NODE [...]          Generate an invitation for NODE\n"
 148                                 "  join INVITATION            Join a VPN using an INVITIATION\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:", 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                                 confbasegiven = true;
 166                                 break;
 167
 168                         case 'n': /* net name given */
 169                                 netname = xstrdup(optarg);
 170                                 break;
 171
 172                         case 1:   /* show help */
 173                                 show_help = true;
 174                                 break;
 175
 176                         case 2:   /* show version */
 177                                 show_version = true;
 178                                 break;
 179
 180                         case 3:   /* open control socket here */
 181                                 pidfilename = xstrdup(optarg);
 182                                 break;
 183
 184                         case 4:   /* force */
 185                                 force = true;
 186                                 break;
 187
 188                         case '?': /* wrong options */
 189                                 usage(true);
 190                                 return false;
 191
 192                         default:
 193                                 break;
 194                 }
 195         }
 196
 197         if(!netname && (netname = getenv("NETNAME")))
 198                 netname = xstrdup(netname);
 199
 200         /* netname "." is special: a "top-level name" */
 201
 202         if(netname && (!*netname || !strcmp(netname, "."))) {
 203                 free(netname);
 204                 netname = NULL;
 205         }
 206
 207         if(netname && (strpbrk(netname, "\\/") || *netname == '.')) {
 208                 fprintf(stderr, "Invalid character in netname!\n");
 209                 return false;
 210         }
 211
 212         return true;
 213 }
 214
 215 static void disable_old_keys(const char *filename, const char *what) {
 216         char tmpfile[PATH_MAX] = "";
 217         char buf[1024];
 218         bool disabled = false;
 219         bool block = false;
 220         bool error = false;
 221         FILE *r, *w;
 222
 223         r = fopen(filename, "r");
 224         if(!r)
 225                 return;
 226
 227         snprintf(tmpfile, sizeof tmpfile, "%s.tmp", filename);
 228
 229         w = fopen(tmpfile, "w");
 230
 231         while(fgets(buf, sizeof buf, r)) {
 232                 if(!block && !strncmp(buf, "-----BEGIN ", 11)) {
 233                         if((strstr(buf, " EC ") && strstr(what, "ECDSA")) || (strstr(buf, " RSA ") && strstr(what, "RSA"))) {
 234                                 disabled = true;
 235                                 block = true;
 236                         }
 237                 }
 238
 239                 bool ecdsapubkey = !strncasecmp(buf, "ECDSAPublicKey", 14) && strchr(" \t=", buf[14]) && strstr(what, "ECDSA");
 240
 241                 if(ecdsapubkey)
 242                         disabled = true;
 243
 244                 if(w) {
 245                         if(block || ecdsapubkey)
 246                                 fputc('#', w);
 247                         if(fputs(buf, w) < 0) {
 248                                 error = true;
 249                                 break;
 250                         }
 251                 }
 252
 253                 if(block && !strncmp(buf, "-----END ", 9))
 254                         block = false;
 255         }
 256
 257         if(w)
 258                 if(fclose(w) < 0)
 259                         error = true;
 260         if(ferror(r) || fclose(r) < 0)
 261                 error = true;
 262
 263         if(disabled) {
 264                 if(!w || error) {
 265                         fprintf(stderr, "Warning: old key(s) found, remove them by hand!\n");
 266                         if(w)
 267                                 unlink(tmpfile);
 268                         return;
 269                 }
 270
 271 #ifdef HAVE_MINGW
 272                 // We cannot atomically replace files on Windows.
 273                 char bakfile[PATH_MAX] = "";
 274                 snprintf(bakfile, sizeof bakfile, "%s.bak", filename);
 275                 if(rename(filename, bakfile) || rename(tmpfile, filename)) {
 276                         rename(bakfile, filename);
 277 #else
 278                 if(rename(tmpfile, filename)) {
 279 #endif
 280                         fprintf(stderr, "Warning: old key(s) found, remove them by hand!\n");
 281                 } else  {
 282 #ifdef HAVE_MINGW
 283                         unlink(bakfile);
 284 #endif
 285                         fprintf(stderr, "Warning: old key(s) found and disabled.\n");
 286                 }
 287         }
 288
 289         unlink(tmpfile);
 290 }
 291
 292 static FILE *ask_and_open(const char *filename, const char *what, const char *mode, bool ask) {
 293         FILE *r;
 294         char *directory;
 295         char buf[PATH_MAX];
 296         char buf2[PATH_MAX];
 297
 298         /* Check stdin and stdout */
 299         if(ask && tty) {
 300                 /* Ask for a file and/or directory name. */
 301                 fprintf(stdout, "Please enter a file to save %s to [%s]: ", what, filename);
 302                 fflush(stdout);
 303
 304                 if(fgets(buf, sizeof buf, stdin) == NULL) {
 305                         fprintf(stderr, "Error while reading stdin: %s\n", strerror(errno));
 306                         return NULL;
 307                 }
 308
 309                 size_t len = strlen(buf);
 310                 if(len)
 311                         buf[--len] = 0;
 312
 313                 if(len)
 314                         filename = buf;
 315         }
 316
 317 #ifdef HAVE_MINGW
 318         if(filename[0] != '\\' && filename[0] != '/' && !strchr(filename, ':')) {
 319 #else
 320         if(filename[0] != '/') {
 321 #endif
 322                 /* The directory is a relative path or a filename. */
 323                 directory = get_current_dir_name();
 324                 snprintf(buf2, sizeof buf2, "%s" SLASH "%s", directory, filename);
 325                 filename = buf2;
 326         }
 327
 328         umask(0077); /* Disallow everything for group and other */
 329
 330         disable_old_keys(filename, what);
 331
 332         /* Open it first to keep the inode busy */
 333
 334         r = fopen(filename, mode);
 335
 336         if(!r) {
 337                 fprintf(stderr, "Error opening file `%s': %s\n", filename, strerror(errno));
 338                 return NULL;
 339         }
 340
 341         return r;
 342 }
 343
 344 /*
 345   Generate a public/private ECDSA keypair, and ask for a file to store
 346   them in.
 347 */
 348 static bool ecdsa_keygen(bool ask) {
 349         ecdsa_t *key;
 350         FILE *f;
 351         char *pubname, *privname;
 352
 353         fprintf(stderr, "Generating ECDSA keypair:\n");
 354
 355         if(!(key = ecdsa_generate())) {
 356                 fprintf(stderr, "Error during key generation!\n");
 357                 return false;
 358         } else
 359                 fprintf(stderr, "Done.\n");
 360
 361         xasprintf(&privname, "%s" SLASH "ecdsa_key.priv", confbase);
 362         f = ask_and_open(privname, "private ECDSA key", "a", ask);
 363         free(privname);
 364
 365         if(!f)
 366                 return false;
 367
 368 #ifdef HAVE_FCHMOD
 369         /* Make it unreadable for others. */
 370         fchmod(fileno(f), 0600);
 371 #endif
 372
 373         if(!ecdsa_write_pem_private_key(key, f)) {
 374                 fprintf(stderr, "Error writing private key!\n");
 375                 ecdsa_free(key);
 376                 fclose(f);
 377                 return false;
 378         }
 379
 380         fclose(f);
 381
 382         if(name)
 383                 xasprintf(&pubname, "%s" SLASH "hosts" SLASH "%s", confbase, name);
 384         else
 385                 xasprintf(&pubname, "%s" SLASH "ecdsa_key.pub", confbase);
 386
 387         f = ask_and_open(pubname, "public ECDSA key", "a", ask);
 388         free(pubname);
 389
 390         if(!f)
 391                 return false;
 392
 393         char *pubkey = ecdsa_get_base64_public_key(key);
 394         fprintf(f, "ECDSAPublicKey = %s\n", pubkey);
 395         free(pubkey);
 396
 397         fclose(f);
 398         ecdsa_free(key);
 399
 400         return true;
 401 }
 402
 403 /*
 404   Generate a public/private RSA keypair, and ask for a file to store
 405   them in.
 406 */
 407 static bool rsa_keygen(int bits, bool ask) {
 408         rsa_t *key;
 409         FILE *f;
 410         char *pubname, *privname;
 411
 412         fprintf(stderr, "Generating %d bits keys:\n", bits);
 413
 414         if(!(key = rsa_generate(bits, 0x10001))) {
 415                 fprintf(stderr, "Error during key generation!\n");
 416                 return false;
 417         } else
 418                 fprintf(stderr, "Done.\n");
 419
 420         xasprintf(&privname, "%s" SLASH "rsa_key.priv", confbase);
 421         f = ask_and_open(privname, "private RSA key", "a", ask);
 422         free(privname);
 423
 424         if(!f)
 425                 return false;
 426
 427 #ifdef HAVE_FCHMOD
 428         /* Make it unreadable for others. */
 429         fchmod(fileno(f), 0600);
 430 #endif
 431
 432         if(!rsa_write_pem_private_key(key, f)) {
 433                 fprintf(stderr, "Error writing private key!\n");
 434                 fclose(f);
 435                 rsa_free(key);
 436                 return false;
 437         }
 438
 439         fclose(f);
 440
 441         if(name)
 442                 xasprintf(&pubname, "%s" SLASH "hosts" SLASH "%s", confbase, name);
 443         else
 444                 xasprintf(&pubname, "%s" SLASH "rsa_key.pub", confbase);
 445
 446         f = ask_and_open(pubname, "public RSA key", "a", ask);
 447         free(pubname);
 448
 449         if(!f)
 450                 return false;
 451
 452         if(!rsa_write_pem_public_key(key, f)) {
 453                 fprintf(stderr, "Error writing public key!\n");
 454                 fclose(f);
 455                 rsa_free(key);
 456                 return false;
 457         }
 458
 459         fclose(f);
 460         rsa_free(key);
 461
 462         return true;
 463 }
 464
 465 char buffer[4096];
 466 size_t blen = 0;
 467
 468 bool recvline(int fd, char *line, size_t len) {
 469         char *newline = NULL;
 470
 471         if(!fd)
 472 abort();
 473         while(!(newline = memchr(buffer, '\n', blen))) {
 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         if(newline - buffer >= len)
 483                 return false;
 484
 485         len = newline - buffer;
 486
 487         memcpy(line, buffer, len);
 488         line[len] = 0;
 489         memmove(buffer, newline + 1, blen - len - 1);
 490         blen -= len + 1;
 491
 492         return true;
 493 }
 494
 495 bool recvdata(int fd, char *data, size_t len) {
 496         if(len == -1)
 497                 len = blen;
 498
 499         while(blen < len) {
 500                 int result = recv(fd, buffer + blen, sizeof buffer - blen, 0);
 501                 if(result == -1 && errno == EINTR)
 502                         continue;
 503                 else if(result <= 0)
 504                         return false;
 505                 blen += result;
 506         }
 507
 508         memcpy(data, buffer, len);
 509         memmove(buffer, buffer + len, blen - len);
 510         blen -= len;
 511
 512         return true;
 513 }
 514
 515 bool sendline(int fd, char *format, ...) {
 516         static char buffer[4096];
 517         char *p = buffer;
 518         int blen = 0;
 519         va_list ap;
 520
 521         va_start(ap, format);
 522         blen = vsnprintf(buffer, sizeof buffer, format, ap);
 523         va_end(ap);
 524
 525         if(blen < 1 || blen >= sizeof buffer)
 526                 return false;
 527
 528         buffer[blen] = '\n';
 529         blen++;
 530
 531         while(blen) {
 532                 int result = send(fd, p, blen, 0);
 533                 if(result == -1 && errno == EINTR)
 534                         continue;
 535                 else if(result <= 0)
 536                         return false;
 537                 p += result;
 538                 blen -= result;
 539         }
 540
 541         return true;
 542 }
 543
 544 static void pcap(int fd, FILE *out, int snaplen) {
 545         sendline(fd, "%d %d %d", CONTROL, REQ_PCAP, snaplen);
 546         char data[9018];
 547
 548         struct {
 549                 uint32_t magic;
 550                 uint16_t major;
 551                 uint16_t minor;
 552                 uint32_t tz_offset;
 553                 uint32_t tz_accuracy;
 554                 uint32_t snaplen;
 555                 uint32_t ll_type;
 556         } header = {
 557                 0xa1b2c3d4,
 558                 2, 4,
 559                 0, 0,
 560                 snaplen ?: sizeof data,
 561                 1,
 562         };
 563
 564         struct {
 565                 uint32_t tv_sec;
 566                 uint32_t tv_usec;
 567                 uint32_t len;
 568                 uint32_t origlen;
 569         } packet;
 570
 571         struct timeval tv;
 572
 573         fwrite(&header, sizeof header, 1, out);
 574         fflush(out);
 575
 576         char line[32];
 577         while(recvline(fd, line, sizeof line)) {
 578                 int code, req, len;
 579                 int n = sscanf(line, "%d %d %d", &code, &req, &len);
 580                 gettimeofday(&tv, NULL);
 581                 if(n != 3 || code != CONTROL || req != REQ_PCAP || len < 0 || len > sizeof data)
 582                         break;
 583                 if(!recvdata(fd, data, len))
 584                         break;
 585                 packet.tv_sec = tv.tv_sec;
 586                 packet.tv_usec = tv.tv_usec;
 587                 packet.len = len;
 588                 packet.origlen = len;
 589                 fwrite(&packet, sizeof packet, 1, out);
 590                 fwrite(data, len, 1, out);
 591                 fflush(out);
 592         }
 593 }
 594
 595 static void logcontrol(int fd, FILE *out, int level) {
 596         sendline(fd, "%d %d %d", CONTROL, REQ_LOG, level);
 597         char data[1024];
 598         char line[32];
 599
 600         while(recvline(fd, line, sizeof line)) {
 601                 int code, req, len;
 602                 int n = sscanf(line, "%d %d %d", &code, &req, &len);
 603                 if(n != 3 || code != CONTROL || req != REQ_LOG || len < 0 || len > sizeof data)
 604                         break;
 605                 if(!recvdata(fd, data, len))
 606                         break;
 607                 fwrite(data, len, 1, out);
 608                 fputc('\n', out);
 609                 fflush(out);
 610         }
 611 }
 612
 613 #ifdef HAVE_MINGW
 614 static bool remove_service(void) {
 615         SC_HANDLE manager = NULL;
 616         SC_HANDLE service = NULL;
 617         SERVICE_STATUS status = {0};
 618
 619         manager = OpenSCManager(NULL, NULL, SC_MANAGER_ALL_ACCESS);
 620         if(!manager) {
 621                 fprintf(stderr, "Could not open service manager: %s\n", winerror(GetLastError()));
 622                 return false;
 623         }
 624
 625         service = OpenService(manager, identname, SERVICE_ALL_ACCESS);
 626
 627         if(!service) {
 628                 fprintf(stderr, "Could not open %s service: %s\n", identname, winerror(GetLastError()));
 629                 return false;
 630         }
 631
 632         if(!ControlService(service, SERVICE_CONTROL_STOP, &status))
 633                 fprintf(stderr, "Could not stop %s service: %s\n", identname, winerror(GetLastError()));
 634         else
 635                 fprintf(stderr, "%s service stopped\n", identname);
 636
 637         if(!DeleteService(service)) {
 638                 fprintf(stderr, "Could not remove %s service: %s\n", identname, winerror(GetLastError()));
 639                 return false;
 640         }
 641
 642         fprintf(stderr, "%s service removed\n", identname);
 643
 644         return true;
 645 }
 646 #endif
 647
 648 bool connect_tincd(bool verbose) {
 649         if(fd >= 0) {
 650                 fd_set r;
 651                 FD_ZERO(&r);
 652                 FD_SET(fd, &r);
 653                 struct timeval tv = {0, 0};
 654                 if(select(fd + 1, &r, NULL, NULL, &tv)) {
 655                         fprintf(stderr, "Previous connection to tincd lost, reconnecting.\n");
 656                         close(fd);
 657                         fd = -1;
 658                 } else {
 659                         return true;
 660                 }
 661         }
 662
 663         FILE *f = fopen(pidfilename, "r");
 664         if(!f) {
 665                 if(verbose)
 666                         fprintf(stderr, "Could not open pid file %s: %s\n", pidfilename, strerror(errno));
 667                 return false;
 668         }
 669
 670         char host[129];
 671         char port[129];
 672
 673         if(fscanf(f, "%20d %1024s %128s port %128s", &pid, controlcookie, host, port) != 4) {
 674                 if(verbose)
 675                         fprintf(stderr, "Could not parse pid file %s\n", pidfilename);
 676                 fclose(f);
 677                 return false;
 678         }
 679
 680         fclose(f);
 681
 682 #ifdef HAVE_MINGW
 683         if(WSAStartup(MAKEWORD(2, 2), &wsa_state)) {
 684                 if(verbose)
 685                         fprintf(stderr, "System call `%s' failed: %s", "WSAStartup", winerror(GetLastError()));
 686                 return false;
 687         }
 688 #endif
 689
 690 #ifndef HAVE_MINGW
 691         struct sockaddr_un sa;
 692         sa.sun_family = AF_UNIX;
 693         strncpy(sa.sun_path, unixsocketname, sizeof sa.sun_path);
 694
 695         fd = socket(AF_UNIX, SOCK_STREAM, 0);
 696         if(fd < 0) {
 697                 if(verbose)
 698                         fprintf(stderr, "Cannot create UNIX socket: %s\n", sockstrerror(sockerrno));
 699                 return false;
 700         }
 701
 702         if(connect(fd, (struct sockaddr *)&sa, sizeof sa) < 0) {
 703                 if(verbose)
 704                         fprintf(stderr, "Cannot connect to UNIX socket %s: %s\n", unixsocketname, sockstrerror(sockerrno));
 705                 close(fd);
 706                 fd = -1;
 707                 return false;
 708         }
 709 #else
 710         struct addrinfo hints = {
 711                 .ai_family = AF_UNSPEC,
 712                 .ai_socktype = SOCK_STREAM,
 713                 .ai_protocol = IPPROTO_TCP,
 714                 .ai_flags = 0,
 715         };
 716
 717         struct addrinfo *res = NULL;
 718
 719         if(getaddrinfo(host, port, &hints, &res) || !res) {
 720                 if(verbose)
 721                         fprintf(stderr, "Cannot resolve %s port %s: %s", host, port, strerror(errno));
 722                 return false;
 723         }
 724
 725         fd = socket(res->ai_family, SOCK_STREAM, IPPROTO_TCP);
 726         if(fd < 0) {
 727                 if(verbose)
 728                         fprintf(stderr, "Cannot create TCP socket: %s\n", sockstrerror(sockerrno));
 729                 return false;
 730         }
 731
 732 #ifdef HAVE_MINGW
 733         unsigned long arg = 0;
 734
 735         if(ioctlsocket(fd, FIONBIO, &arg) != 0) {
 736                 if(verbose)
 737                         fprintf(stderr, "ioctlsocket failed: %s", sockstrerror(sockerrno));
 738         }
 739 #endif
 740
 741         if(connect(fd, res->ai_addr, res->ai_addrlen) < 0) {
 742                 if(verbose)
 743                         fprintf(stderr, "Cannot connect to %s port %s: %s\n", host, port, sockstrerror(sockerrno));
 744                 close(fd);
 745                 fd = -1;
 746                 return false;
 747         }
 748
 749         freeaddrinfo(res);
 750 #endif
 751
 752         char data[4096];
 753         int version;
 754
 755         if(!recvline(fd, line, sizeof line) || sscanf(line, "%d %s %d", &code, data, &version) != 3 || code != 0) {
 756                 if(verbose)
 757                         fprintf(stderr, "Cannot read greeting from control socket: %s\n", sockstrerror(sockerrno));
 758                 close(fd);
 759                 fd = -1;
 760                 return false;
 761         }
 762
 763         sendline(fd, "%d ^%s %d", ID, controlcookie, TINC_CTL_VERSION_CURRENT);
 764
 765         if(!recvline(fd, line, sizeof line) || sscanf(line, "%d %d %d", &code, &version, &pid) != 3 || code != 4 || version != TINC_CTL_VERSION_CURRENT) {
 766                 if(verbose)
 767                         fprintf(stderr, "Could not fully establish control socket connection\n");
 768                 close(fd);
 769                 fd = -1;
 770                 return false;
 771         }
 772
 773         return true;
 774 }
 775
 776
 777 static int cmd_start(int argc, char *argv[]) {
 778         if(connect_tincd(false)) {
 779                 if(netname)
 780                         fprintf(stderr, "A tincd is already running for net `%s' with pid %d.\n", netname, pid);
 781                 else
 782                         fprintf(stderr, "A tincd is already running with pid %d.\n", pid);
 783                 return 0;
 784         }
 785
 786         char *c;
 787         char *slash = strrchr(program_name, '/');
 788
 789 #ifdef HAVE_MINGW
 790         if ((c = strrchr(program_name, '\\')) > slash)
 791                 slash = c;
 792 #endif
 793
 794         if (slash++)
 795                 xasprintf(&c, "%.*stincd", (int)(slash - program_name), program_name);
 796         else
 797                 c = "tincd";
 798
 799         int nargc = 0;
 800         char **nargv = xzalloc((optind + argc) * sizeof *nargv);
 801
 802         nargv[nargc++] = c;
 803         for(int i = 1; i < optind; i++)
 804                 nargv[nargc++] = orig_argv[i];
 805         for(int i = 1; i < argc; i++)
 806                 nargv[nargc++] = argv[i];
 807
 808 #ifdef HAVE_MINGW
 809         execvp(c, nargv);
 810         fprintf(stderr, "Error starting %s: %s\n", c, strerror(errno));
 811         return 1;
 812 #else
 813         pid_t pid = fork();
 814         if(pid == -1) {
 815                 fprintf(stderr, "Could not fork: %s\n", strerror(errno));
 816                 free(nargv);
 817                 return 1;
 818         }
 819
 820         if(!pid)
 821                 exit(execvp(c, nargv));
 822
 823         free(nargv);
 824
 825         int status = -1;
 826         if(waitpid(pid, &status, 0) != pid || !WIFEXITED(status) || WEXITSTATUS(status)) {
 827                 fprintf(stderr, "Error starting %s\n", c);
 828                 return 1;
 829         }
 830
 831         return 0;
 832 #endif
 833 }
 834
 835 static int cmd_stop(int argc, char *argv[]) {
 836         if(argc > 1) {
 837                 fprintf(stderr, "Too many arguments!\n");
 838                 return 1;
 839         }
 840
 841 #ifndef HAVE_MINGW
 842         if(!connect_tincd(true)) {
 843                 if(pid) {
 844                         if(kill(pid, SIGTERM)) {
 845                                 fprintf(stderr, "Could not send TERM signal to process with PID %u: %s\n", pid, strerror(errno));
 846                                 return 1;
 847                         }
 848
 849                         fprintf(stderr, "Sent TERM signal to process with PID %u.\n", pid);
 850                         waitpid(pid, NULL, 0);
 851                         return 0;
 852                 }
 853
 854                 return 1;
 855         }
 856
 857         sendline(fd, "%d %d", CONTROL, REQ_STOP);
 858
 859         while(recvline(fd, line, sizeof line)) {
 860                 // Wait for tincd to close the connection...
 861         }
 862 #else
 863         if(!remove_service())
 864                 return 1;
 865 #endif
 866         close(fd);
 867         pid = 0;
 868         fd = -1;
 869
 870         return 0;
 871 }
 872
 873 static int cmd_restart(int argc, char *argv[]) {
 874         cmd_stop(argc, argv);
 875         return cmd_start(argc, argv);
 876 }
 877
 878 static int cmd_reload(int argc, char *argv[]) {
 879         if(argc > 1) {
 880                 fprintf(stderr, "Too many arguments!\n");
 881                 return 1;
 882         }
 883
 884         if(!connect_tincd(true))
 885                 return 1;
 886
 887         sendline(fd, "%d %d", CONTROL, REQ_RELOAD);
 888         if(!recvline(fd, line, sizeof line) || sscanf(line, "%d %d %d", &code, &req, &result) != 3 || code != CONTROL || req != REQ_RELOAD || result) {
 889                 fprintf(stderr, "Could not reload configuration.\n");
 890                 return 1;
 891         }
 892
 893         return 0;
 894
 895 }
 896
 897 static int cmd_dump(int argc, char *argv[]) {
 898         bool only_reachable = false;
 899
 900         if(argc > 2 && !strcasecmp(argv[1], "reachable")) {
 901                 if(strcasecmp(argv[2], "nodes")) {
 902                         fprintf(stderr, "`reachable' only supported for nodes.\n");
 903                         usage(true);
 904                         return 1;
 905                 }
 906                 only_reachable = true;
 907                 argv++;
 908                 argc--;
 909         }
 910
 911         if(argc != 2) {
 912                 fprintf(stderr, "Invalid number of arguments.\n");
 913                 usage(true);
 914                 return 1;
 915         }
 916
 917         if(!connect_tincd(true))
 918                 return 1;
 919
 920         int do_graph = 0;
 921
 922         if(!strcasecmp(argv[1], "nodes"))
 923                 sendline(fd, "%d %d", CONTROL, REQ_DUMP_NODES);
 924         else if(!strcasecmp(argv[1], "edges"))
 925                 sendline(fd, "%d %d", CONTROL, REQ_DUMP_EDGES);
 926         else if(!strcasecmp(argv[1], "subnets"))
 927                 sendline(fd, "%d %d", CONTROL, REQ_DUMP_SUBNETS);
 928         else if(!strcasecmp(argv[1], "connections"))
 929                 sendline(fd, "%d %d", CONTROL, REQ_DUMP_CONNECTIONS);
 930         else if(!strcasecmp(argv[1], "graph")) {
 931                 sendline(fd, "%d %d", CONTROL, REQ_DUMP_NODES);
 932                 sendline(fd, "%d %d", CONTROL, REQ_DUMP_EDGES);
 933                 do_graph = 1;
 934         } else if(!strcasecmp(argv[1], "digraph")) {
 935                 sendline(fd, "%d %d", CONTROL, REQ_DUMP_NODES);
 936                 sendline(fd, "%d %d", CONTROL, REQ_DUMP_EDGES);
 937                 do_graph = 2;
 938         } else {
 939                 fprintf(stderr, "Unknown dump type '%s'.\n", argv[1]);
 940                 usage(true);
 941                 return 1;
 942         }
 943
 944         if(do_graph == 1)
 945                 printf("graph {\n");
 946         else if(do_graph == 2)
 947                 printf("digraph {\n");
 948
 949         while(recvline(fd, line, sizeof line)) {
 950                 char node1[4096], node2[4096];
 951                 int n = sscanf(line, "%d %d %s %s", &code, &req, node1, node2);
 952                 if(n == 2) {
 953                         if(do_graph && req == REQ_DUMP_NODES)
 954                                 continue;
 955                         else {
 956                                 if(do_graph)
 957                                         printf("}\n");
 958                                 return 0;
 959                         }
 960                 }
 961                 if(n < 2)
 962                         break;
 963
 964                 char node[4096];
 965                 char from[4096];
 966                 char to[4096];
 967                 char subnet[4096];
 968                 char host[4096];
 969                 char port[4096];
 970                 char via[4096];
 971                 char nexthop[4096];
 972                 int cipher, digest, maclength, compression, distance, socket, weight;
 973                 short int pmtu, minmtu, maxmtu;
 974                 unsigned int options, status_int;
 975                 node_status_t status;
 976                 long int last_state_change;
 977
 978                 switch(req) {
 979                         case REQ_DUMP_NODES: {
 980                                 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);
 981                                 if(n != 16) {
 982                                         fprintf(stderr, "Unable to parse node dump from tincd: %s\n", line);
 983                                         return 1;
 984                                 }
 985
 986                                 memcpy(&status, &status_int, sizeof status);
 987
 988                                 if(do_graph) {
 989                                         const char *color = "black";
 990                                         if(!strcmp(host, "MYSELF"))
 991                                                 color = "green";
 992                                         else if(!status.reachable)
 993                                                 color = "red";
 994                                         else if(strcmp(via, node))
 995                                                 color = "orange";
 996                                         else if(!status.validkey)
 997                                                 color = "black";
 998                                         else if(minmtu > 0)
 999                                                 color = "green";
1000                                         printf(" %s [label = \"%s\", color = \"%s\"%s];\n", node, node, color, strcmp(host, "MYSELF") ? "" : ", style = \"filled\"");
1001                                 } else {
1002                                         if(only_reachable && !status.reachable)
1003                                                 continue;
1004                                         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",
1005                                                         node, host, port, cipher, digest, maclength, compression, options, status_int, nexthop, via, distance, pmtu, minmtu, maxmtu);
1006                                 }
1007                         } break;
1008
1009                         case REQ_DUMP_EDGES: {
1010                                 int n = sscanf(line, "%*d %*d %s %s %s port %s %x %d", from, to, host, port, &options, &weight);
1011                                 if(n != 6) {
1012                                         fprintf(stderr, "Unable to parse edge dump from tincd.\n");
1013                                         return 1;
1014                                 }
1015
1016                                 if(do_graph) {
1017                                         float w = 1 + 65536.0 / weight;
1018                                         if(do_graph == 1 && strcmp(node1, node2) > 0)
1019                                                 printf(" %s -- %s [w = %f, weight = %f];\n", node1, node2, w, w);
1020                                         else if(do_graph == 2)
1021                                                 printf(" %s -> %s [w = %f, weight = %f];\n", node1, node2, w, w);
1022                                 } else {
1023                                         printf("%s to %s at %s port %s options %x weight %d\n", from, to, host, port, options, weight);
1024                                 }
1025                         } break;
1026
1027                         case REQ_DUMP_SUBNETS: {
1028                                 int n = sscanf(line, "%*d %*d %s %s", subnet, node);
1029                                 if(n != 2) {
1030                                         fprintf(stderr, "Unable to parse subnet dump from tincd.\n");
1031                                         return 1;
1032                                 }
1033                                 printf("%s owner %s\n", strip_weight(subnet), node);
1034                         } break;
1035
1036                         case REQ_DUMP_CONNECTIONS: {
1037                                 int n = sscanf(line, "%*d %*d %s %s port %s %x %d %x", node, host, port, &options, &socket, &status_int);
1038                                 if(n != 6) {
1039                                         fprintf(stderr, "Unable to parse connection dump from tincd.\n");
1040                                         return 1;
1041                                 }
1042                                 printf("%s at %s port %s options %x socket %d status %x\n", node, host, port, options, socket, status_int);
1043                         } break;
1044
1045                         default:
1046                                 fprintf(stderr, "Unable to parse dump from tincd.\n");
1047                                 return 1;
1048                 }
1049         }
1050
1051         fprintf(stderr, "Error receiving dump.\n");
1052         return 1;
1053 }
1054
1055 static int cmd_purge(int argc, char *argv[]) {
1056         if(argc > 1) {
1057                 fprintf(stderr, "Too many arguments!\n");
1058                 return 1;
1059         }
1060
1061         if(!connect_tincd(true))
1062                 return 1;
1063
1064         sendline(fd, "%d %d", CONTROL, REQ_PURGE);
1065         if(!recvline(fd, line, sizeof line) || sscanf(line, "%d %d %d", &code, &req, &result) != 3 || code != CONTROL || req != REQ_PURGE || result) {
1066                 fprintf(stderr, "Could not purge old information.\n");
1067                 return 1;
1068         }
1069
1070         return 0;
1071 }
1072
1073 static int cmd_debug(int argc, char *argv[]) {
1074         if(argc != 2) {
1075                 fprintf(stderr, "Invalid number of arguments.\n");
1076                 return 1;
1077         }
1078
1079         if(!connect_tincd(true))
1080                 return 1;
1081
1082         int debuglevel = atoi(argv[1]);
1083         int origlevel;
1084
1085         sendline(fd, "%d %d %d", CONTROL, REQ_SET_DEBUG, debuglevel);
1086         if(!recvline(fd, line, sizeof line) || sscanf(line, "%d %d %d", &code, &req, &origlevel) != 3 || code != CONTROL || req != REQ_SET_DEBUG) {
1087                 fprintf(stderr, "Could not set debug level.\n");
1088                 return 1;
1089         }
1090
1091         fprintf(stderr, "Old level %d, new level %d.\n", origlevel, debuglevel);
1092         return 0;
1093 }
1094
1095 static int cmd_retry(int argc, char *argv[]) {
1096         if(argc > 1) {
1097                 fprintf(stderr, "Too many arguments!\n");
1098                 return 1;
1099         }
1100
1101         if(!connect_tincd(true))
1102                 return 1;
1103
1104         sendline(fd, "%d %d", CONTROL, REQ_RETRY);
1105         if(!recvline(fd, line, sizeof line) || sscanf(line, "%d %d %d", &code, &req, &result) != 3 || code != CONTROL || req != REQ_RETRY || result) {
1106                 fprintf(stderr, "Could not retry outgoing connections.\n");
1107                 return 1;
1108         }
1109
1110         return 0;
1111 }
1112
1113 static int cmd_connect(int argc, char *argv[]) {
1114         if(argc != 2) {
1115                 fprintf(stderr, "Invalid number of arguments.\n");
1116                 return 1;
1117         }
1118
1119         if(!check_id(argv[1])) {
1120                 fprintf(stderr, "Invalid name for node.\n");
1121                 return 1;
1122         }
1123
1124         if(!connect_tincd(true))
1125                 return 1;
1126
1127         sendline(fd, "%d %d %s", CONTROL, REQ_CONNECT, argv[1]);
1128         if(!recvline(fd, line, sizeof line) || sscanf(line, "%d %d %d", &code, &req, &result) != 3 || code != CONTROL || req != REQ_CONNECT || result) {
1129                 fprintf(stderr, "Could not connect to %s.\n", argv[1]);
1130                 return 1;
1131         }
1132
1133         return 0;
1134 }
1135
1136 static int cmd_disconnect(int argc, char *argv[]) {
1137         if(argc != 2) {
1138                 fprintf(stderr, "Invalid number of arguments.\n");
1139                 return 1;
1140         }
1141
1142         if(!check_id(argv[1])) {
1143                 fprintf(stderr, "Invalid name for node.\n");
1144                 return 1;
1145         }
1146
1147         if(!connect_tincd(true))
1148                 return 1;
1149
1150         sendline(fd, "%d %d %s", CONTROL, REQ_DISCONNECT, argv[1]);
1151         if(!recvline(fd, line, sizeof line) || sscanf(line, "%d %d %d", &code, &req, &result) != 3 || code != CONTROL || req != REQ_DISCONNECT || result) {
1152                 fprintf(stderr, "Could not disconnect %s.\n", argv[1]);
1153                 return 1;
1154         }
1155
1156         return 0;
1157 }
1158
1159 static int cmd_top(int argc, char *argv[]) {
1160         if(argc > 1) {
1161                 fprintf(stderr, "Too many arguments!\n");
1162                 return 1;
1163         }
1164
1165 #ifdef HAVE_CURSES
1166         if(!connect_tincd(true))
1167                 return 1;
1168
1169         top(fd);
1170         return 0;
1171 #else
1172         fprintf(stderr, "This version of tinc was compiled without support for the curses library.\n");
1173         return 1;
1174 #endif
1175 }
1176
1177 static int cmd_pcap(int argc, char *argv[]) {
1178         if(argc > 2) {
1179                 fprintf(stderr, "Too many arguments!\n");
1180                 return 1;
1181         }
1182
1183         if(!connect_tincd(true))
1184                 return 1;
1185
1186         pcap(fd, stdout, argc > 1 ? atoi(argv[1]) : 0);
1187         return 0;
1188 }
1189
1190 static int cmd_log(int argc, char *argv[]) {
1191         if(argc > 2) {
1192                 fprintf(stderr, "Too many arguments!\n");
1193                 return 1;
1194         }
1195
1196         if(!connect_tincd(true))
1197                 return 1;
1198
1199         logcontrol(fd, stdout, argc > 1 ? atoi(argv[1]) : -1);
1200         return 0;
1201 }
1202
1203 static int cmd_pid(int argc, char *argv[]) {
1204         if(argc > 1) {
1205                 fprintf(stderr, "Too many arguments!\n");
1206                 return 1;
1207         }
1208
1209         if(!connect_tincd(true) && !pid)
1210                 return 1;
1211
1212         printf("%d\n", pid);
1213         return 0;
1214 }
1215
1216 int rstrip(char *value) {
1217         int len = strlen(value);
1218         while(len && strchr("\t\r\n ", value[len - 1]))
1219                 value[--len] = 0;
1220         return len;
1221 }
1222
1223 char *get_my_name(bool verbose) {
1224         FILE *f = fopen(tinc_conf, "r");
1225         if(!f) {
1226                 if(verbose)
1227                         fprintf(stderr, "Could not open %s: %s\n", tinc_conf, strerror(errno));
1228                 return NULL;
1229         }
1230
1231         char buf[4096];
1232         char *value;
1233         while(fgets(buf, sizeof buf, f)) {
1234                 int len = strcspn(buf, "\t =");
1235                 value = buf + len;
1236                 value += strspn(value, "\t ");
1237                 if(*value == '=') {
1238                         value++;
1239                         value += strspn(value, "\t ");
1240                 }
1241                 if(!rstrip(value))
1242                         continue;
1243                 buf[len] = 0;
1244                 if(strcasecmp(buf, "Name"))
1245                         continue;
1246                 if(*value) {
1247                         fclose(f);
1248                         return strdup(value);
1249                 }
1250         }
1251
1252         fclose(f);
1253         if(verbose)
1254                 fprintf(stderr, "Could not find Name in %s.\n", tinc_conf);
1255         return NULL;
1256 }
1257
1258 const var_t variables[] = {
1259         /* Server configuration */
1260         {"AddressFamily", VAR_SERVER},
1261         {"AutoConnect", VAR_SERVER | VAR_SAFE},
1262         {"BindToAddress", VAR_SERVER | VAR_MULTIPLE},
1263         {"BindToInterface", VAR_SERVER},
1264         {"Broadcast", VAR_SERVER | VAR_SAFE},
1265         {"ConnectTo", VAR_SERVER | VAR_MULTIPLE | VAR_SAFE},
1266         {"DecrementTTL", VAR_SERVER},
1267         {"Device", VAR_SERVER},
1268         {"DeviceType", VAR_SERVER},
1269         {"DirectOnly", VAR_SERVER},
1270         {"ECDSAPrivateKeyFile", VAR_SERVER},
1271         {"ExperimentalProtocol", VAR_SERVER},
1272         {"Forwarding", VAR_SERVER},
1273         {"GraphDumpFile", VAR_SERVER | VAR_OBSOLETE},
1274         {"Hostnames", VAR_SERVER},
1275         {"IffOneQueue", VAR_SERVER},
1276         {"Interface", VAR_SERVER},
1277         {"KeyExpire", VAR_SERVER},
1278         {"LocalDiscovery", VAR_SERVER},
1279         {"MACExpire", VAR_SERVER},
1280         {"MaxOutputBufferSize", VAR_SERVER},
1281         {"MaxTimeout", VAR_SERVER},
1282         {"Mode", VAR_SERVER | VAR_SAFE},
1283         {"Name", VAR_SERVER},
1284         {"PingInterval", VAR_SERVER},
1285         {"PingTimeout", VAR_SERVER},
1286         {"PriorityInheritance", VAR_SERVER},
1287         {"PrivateKey", VAR_SERVER | VAR_OBSOLETE},
1288         {"PrivateKeyFile", VAR_SERVER},
1289         {"ProcessPriority", VAR_SERVER},
1290         {"Proxy", VAR_SERVER},
1291         {"ReplayWindow", VAR_SERVER},
1292         {"ScriptsExtension", VAR_SERVER},
1293         {"ScriptsInterpreter", VAR_SERVER},
1294         {"StrictSubnets", VAR_SERVER},
1295         {"TunnelServer", VAR_SERVER},
1296         {"UDPRcvBuf", VAR_SERVER},
1297         {"UDPSndBuf", VAR_SERVER},
1298         {"VDEGroup", VAR_SERVER},
1299         {"VDEPort", VAR_SERVER},
1300         /* Host configuration */
1301         {"Address", VAR_HOST | VAR_MULTIPLE},
1302         {"Cipher", VAR_SERVER | VAR_HOST},
1303         {"ClampMSS", VAR_SERVER | VAR_HOST},
1304         {"Compression", VAR_SERVER | VAR_HOST},
1305         {"Digest", VAR_SERVER | VAR_HOST},
1306         {"ECDSAPublicKey", VAR_HOST},
1307         {"ECDSAPublicKeyFile", VAR_SERVER | VAR_HOST},
1308         {"IndirectData", VAR_SERVER | VAR_HOST},
1309         {"MACLength", VAR_SERVER | VAR_HOST},
1310         {"PMTU", VAR_SERVER | VAR_HOST},
1311         {"PMTUDiscovery", VAR_SERVER | VAR_HOST},
1312         {"Port", VAR_HOST},
1313         {"PublicKey", VAR_HOST | VAR_OBSOLETE},
1314         {"PublicKeyFile", VAR_SERVER | VAR_HOST | VAR_OBSOLETE},
1315         {"Subnet", VAR_HOST | VAR_MULTIPLE | VAR_SAFE},
1316         {"TCPOnly", VAR_SERVER | VAR_HOST},
1317         {"Weight", VAR_HOST | VAR_SAFE},
1318         {NULL, 0}
1319 };
1320
1321 static int cmd_config(int argc, char *argv[]) {
1322         if(argc < 2) {
1323                 fprintf(stderr, "Invalid number of arguments.\n");
1324                 return 1;
1325         }
1326
1327         if(strcasecmp(argv[0], "config"))
1328                 argv--, argc++;
1329
1330         int action = -2;
1331         if(!strcasecmp(argv[1], "get")) {
1332                 argv++, argc--;
1333         } else if(!strcasecmp(argv[1], "add")) {
1334                 argv++, argc--, action = 1;
1335         } else if(!strcasecmp(argv[1], "del")) {
1336                 argv++, argc--, action = -1;
1337         } else if(!strcasecmp(argv[1], "replace") || !strcasecmp(argv[1], "set") || !strcasecmp(argv[1], "change")) {
1338                 argv++, argc--, action = 0;
1339         }
1340
1341         if(argc < 2) {
1342                 fprintf(stderr, "Invalid number of arguments.\n");
1343                 return 1;
1344         }
1345
1346         // Concatenate the rest of the command line
1347         strncpy(line, argv[1], sizeof line - 1);
1348         for(int i = 2; i < argc; i++) {
1349                 strncat(line, " ", sizeof line - 1 - strlen(line));
1350                 strncat(line, argv[i], sizeof line - 1 - strlen(line));
1351         }
1352
1353         // Liberal parsing into node name, variable name and value.
1354         char *node = NULL;
1355         char *variable;
1356         char *value;
1357         int len;
1358
1359         len = strcspn(line, "\t =");
1360         value = line + len;
1361         value += strspn(value, "\t ");
1362         if(*value == '=') {
1363                 value++;
1364                 value += strspn(value, "\t ");
1365         }
1366         line[len] = '\0';
1367         variable = strchr(line, '.');
1368         if(variable) {
1369                 node = line;
1370                 *variable++ = 0;
1371         } else {
1372                 variable = line;
1373         }
1374
1375         if(!*variable) {
1376                 fprintf(stderr, "No variable given.\n");
1377                 return 1;
1378         }
1379
1380         if(action >= 0 && !*value) {
1381                 fprintf(stderr, "No value for variable given.\n");
1382                 return 1;
1383         }
1384
1385         if(action < -1 && *value)
1386                 action = 0;
1387
1388         /* Some simple checks. */
1389         bool found = false;
1390
1391         for(int i = 0; variables[i].name; i++) {
1392                 if(strcasecmp(variables[i].name, variable))
1393                         continue;
1394
1395                 found = true;
1396                 variable = (char *)variables[i].name;
1397
1398                 /* Discourage use of obsolete variables. */
1399
1400                 if(variables[i].type & VAR_OBSOLETE && action >= 0) {
1401                         if(force) {
1402                                 fprintf(stderr, "Warning: %s is an obsolete variable!\n", variable);
1403                         } else {
1404                                 fprintf(stderr, "%s is an obsolete variable! Use --force to use it anyway.\n", variable);
1405                                 return 1;
1406                         }
1407                 }
1408
1409                 /* Don't put server variables in host config files */
1410
1411                 if(node && !(variables[i].type & VAR_HOST) && action >= 0) {
1412                         if(force) {
1413                                 fprintf(stderr, "Warning: %s is not a host configuration variable!\n", variable);
1414                         } else {
1415                                 fprintf(stderr, "%s is not a host configuration variable! Use --force to use it anyway.\n", variable);
1416                                 return 1;
1417                         }
1418                 }
1419
1420                 /* Should this go into our own host config file? */
1421
1422                 if(!node && !(variables[i].type & VAR_SERVER)) {
1423                         node = get_my_name(true);
1424                         if(!node)
1425                                 return 1;
1426                 }
1427
1428                 break;
1429         }
1430
1431         if(node && !check_id(node)) {
1432                 fprintf(stderr, "Invalid name for node.\n");
1433                 return 1;
1434         }
1435
1436         if(!found) {
1437                 if(force || action < 0) {
1438                         fprintf(stderr, "Warning: %s is not a known configuration variable!\n", variable);
1439                 } else {
1440                         fprintf(stderr, "%s: is not a known configuration variable! Use --force to use it anyway.\n", variable);
1441                         return 1;
1442                 }
1443         }
1444
1445         // Open the right configuration file.
1446         char *filename;
1447         if(node)
1448                 xasprintf(&filename, "%s" SLASH "%s", hosts_dir, node);
1449         else
1450                 filename = tinc_conf;
1451
1452         FILE *f = fopen(filename, "r");
1453         if(!f) {
1454                 fprintf(stderr, "Could not open configuration file %s: %s\n", filename, strerror(errno));
1455                 return 1;
1456         }
1457
1458         char *tmpfile = NULL;
1459         FILE *tf = NULL;
1460
1461         if(action >= -1) {
1462                 xasprintf(&tmpfile, "%s.config.tmp", filename);
1463                 tf = fopen(tmpfile, "w");
1464                 if(!tf) {
1465                         fprintf(stderr, "Could not open temporary file %s: %s\n", tmpfile, strerror(errno));
1466                         fclose(f);
1467                         return 1;
1468                 }
1469         }
1470
1471         // Copy the file, making modifications on the fly, unless we are just getting a value.
1472         char buf1[4096];
1473         char buf2[4096];
1474         bool set = false;
1475         bool removed = false;
1476         found = false;
1477
1478         while(fgets(buf1, sizeof buf1, f)) {
1479                 buf1[sizeof buf1 - 1] = 0;
1480                 strncpy(buf2, buf1, sizeof buf2);
1481
1482                 // Parse line in a simple way
1483                 char *bvalue;
1484                 int len;
1485
1486                 len = strcspn(buf2, "\t =");
1487                 bvalue = buf2 + len;
1488                 bvalue += strspn(bvalue, "\t ");
1489                 if(*bvalue == '=') {
1490                         bvalue++;
1491                         bvalue += strspn(bvalue, "\t ");
1492                 }
1493                 rstrip(bvalue);
1494                 buf2[len] = '\0';
1495
1496                 // Did it match?
1497                 if(!strcasecmp(buf2, variable)) {
1498                         // Get
1499                         if(action < -1) {
1500                                 found = true;
1501                                 printf("%s\n", bvalue);
1502                         // Del
1503                         } else if(action == -1) {
1504                                 if(!*value || !strcasecmp(bvalue, value)) {
1505                                         removed = true;
1506                                         continue;
1507                                 }
1508                         // Set
1509                         } else if(action == 0) {
1510                                 // Already set? Delete the rest...
1511                                 if(set)
1512                                         continue;
1513                                 // Otherwise, replace.
1514                                 if(fprintf(tf, "%s = %s\n", variable, value) < 0) {
1515                                         fprintf(stderr, "Error writing to temporary file %s: %s\n", tmpfile, strerror(errno));
1516                                         return 1;
1517                                 }
1518                                 set = true;
1519                                 continue;
1520                         }
1521                 }
1522
1523                 if(action >= -1) {
1524                         // Copy original line...
1525                         if(fputs(buf1, tf) < 0) {
1526                                 fprintf(stderr, "Error writing to temporary file %s: %s\n", tmpfile, strerror(errno));
1527                                 return 1;
1528                         }
1529
1530                         // Add newline if it is missing...
1531                         if(*buf1 && buf1[strlen(buf1) - 1] != '\n') {
1532                                 if(fputc('\n', tf) < 0) {
1533                                         fprintf(stderr, "Error writing to temporary file %s: %s\n", tmpfile, strerror(errno));
1534                                         return 1;
1535                                 }
1536                         }
1537                 }
1538         }
1539
1540         // Make sure we read everything...
1541         if(ferror(f) || !feof(f)) {
1542                 fprintf(stderr, "Error while reading from configuration file %s: %s\n", filename, strerror(errno));
1543                 return 1;
1544         }
1545
1546         if(fclose(f)) {
1547                 fprintf(stderr, "Error closing configuration file %s: %s\n", filename, strerror(errno));
1548                 return 1;
1549         }
1550
1551         // Add new variable if necessary.
1552         if(action > 0 || (action == 0 && !set)) {
1553                 if(fprintf(tf, "%s = %s\n", variable, value) < 0) {
1554                         fprintf(stderr, "Error writing to temporary file %s: %s\n", tmpfile, strerror(errno));
1555                         return 1;
1556                 }
1557         }
1558
1559         if(action < -1) {
1560                 if(!found)
1561                         fprintf(stderr, "No matching configuration variables found.\n");
1562                 return 0;
1563         }
1564
1565         // Make sure we wrote everything...
1566         if(fclose(tf)) {
1567                 fprintf(stderr, "Error closing temporary file %s: %s\n", tmpfile, strerror(errno));
1568                 return 1;
1569         }
1570
1571         // Could we find what we had to remove?
1572         if(action < 0 && !removed) {
1573                 remove(tmpfile);
1574                 fprintf(stderr, "No configuration variables deleted.\n");
1575                 return *value;
1576         }
1577
1578         // Replace the configuration file with the new one
1579 #ifdef HAVE_MINGW
1580         if(remove(filename)) {
1581                 fprintf(stderr, "Error replacing file %s: %s\n", filename, strerror(errno));
1582                 return 1;
1583         }
1584 #endif
1585         if(rename(tmpfile, filename)) {
1586                 fprintf(stderr, "Error renaming temporary file %s to configuration file %s: %s\n", tmpfile, filename, strerror(errno));
1587                 return 1;
1588         }
1589
1590         // Silently try notifying a running tincd of changes.
1591         if(connect_tincd(false))
1592                 sendline(fd, "%d %d", CONTROL, REQ_RELOAD);
1593
1594         return 0;
1595 }
1596
1597 bool check_id(const char *name) {
1598         if(!name || !*name)
1599                 return false;
1600
1601         for(int i = 0; i < strlen(name); i++) {
1602                 if(!isalnum(name[i]) && name[i] != '_')
1603                         return false;
1604         }
1605
1606         return true;
1607 }
1608
1609 static int cmd_init(int argc, char *argv[]) {
1610         if(!access(tinc_conf, F_OK)) {
1611                 fprintf(stderr, "Configuration file %s already exists!\n", tinc_conf);
1612                 return 1;
1613         }
1614
1615         if(argc > 2) {
1616                 fprintf(stderr, "Too many arguments!\n");
1617                 return 1;
1618         } else if(argc < 2) {
1619                 if(tty) {
1620                         char buf[1024];
1621                         fprintf(stdout, "Enter the Name you want your tinc node to have: ");
1622                         fflush(stdout);
1623                         if(!fgets(buf, sizeof buf, stdin)) {
1624                                 fprintf(stderr, "Error while reading stdin: %s\n", strerror(errno));
1625                                 return 1;
1626                         }
1627                         int len = rstrip(buf);
1628                         if(!len) {
1629                                 fprintf(stderr, "No name given!\n");
1630                                 return 1;
1631                         }
1632                         name = strdup(buf);
1633                 } else {
1634                         fprintf(stderr, "No Name given!\n");
1635                         return 1;
1636                 }
1637         } else {
1638                 name = strdup(argv[1]);
1639                 if(!*name) {
1640                         fprintf(stderr, "No Name given!\n");
1641                         return 1;
1642                 }
1643         }
1644
1645         if(!check_id(name)) {
1646                 fprintf(stderr, "Invalid Name! Only a-z, A-Z, 0-9 and _ are allowed characters.\n");
1647                 return 1;
1648         }
1649
1650         if(mkdir(confdir, 0755) && errno != EEXIST) {
1651                 fprintf(stderr, "Could not create directory %s: %s\n", CONFDIR, strerror(errno));
1652                 return 1;
1653         }
1654
1655         if(mkdir(confbase, 0755) && errno != EEXIST) {
1656                 fprintf(stderr, "Could not create directory %s: %s\n", confbase, strerror(errno));
1657                 return 1;
1658         }
1659
1660         if(mkdir(hosts_dir, 0755) && errno != EEXIST) {
1661                 fprintf(stderr, "Could not create directory %s: %s\n", hosts_dir, strerror(errno));
1662                 return 1;
1663         }
1664
1665         FILE *f = fopen(tinc_conf, "w");
1666         if(!f) {
1667                 fprintf(stderr, "Could not create file %s: %s\n", tinc_conf, strerror(errno));
1668                 return 1;
1669         }
1670
1671         fprintf(f, "Name = %s\n", name);
1672         fclose(f);
1673
1674         if(!rsa_keygen(2048, false) || !ecdsa_keygen(false))
1675                 return 1;
1676
1677 #ifndef HAVE_MINGW
1678         char *filename;
1679         xasprintf(&filename, "%s" SLASH "tinc-up", confbase);
1680         if(access(filename, F_OK)) {
1681                 FILE *f = fopen(filename, "w");
1682                 if(!f) {
1683                         fprintf(stderr, "Could not create file %s: %s\n", filename, strerror(errno));
1684                         return 1;
1685                 }
1686                 fchmod(fileno(f), 0755);
1687                 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");
1688                 fclose(f);
1689         }
1690 #endif
1691
1692         return 0;
1693
1694 }
1695
1696 static int cmd_generate_keys(int argc, char *argv[]) {
1697         if(argc > 2) {
1698                 fprintf(stderr, "Too many arguments!\n");
1699                 return 1;
1700         }
1701
1702         if(!name)
1703                 name = get_my_name(false);
1704
1705         return !(rsa_keygen(argc > 1 ? atoi(argv[1]) : 2048, true) && ecdsa_keygen(true));
1706 }
1707
1708 static int cmd_generate_rsa_keys(int argc, char *argv[]) {
1709         if(argc > 2) {
1710                 fprintf(stderr, "Too many arguments!\n");
1711                 return 1;
1712         }
1713
1714         if(!name)
1715                 name = get_my_name(false);
1716
1717         return !rsa_keygen(argc > 1 ? atoi(argv[1]) : 2048, true);
1718 }
1719
1720 static int cmd_generate_ecdsa_keys(int argc, char *argv[]) {
1721         if(argc > 1) {
1722                 fprintf(stderr, "Too many arguments!\n");
1723                 return 1;
1724         }
1725
1726         if(!name)
1727                 name = get_my_name(false);
1728
1729         return !ecdsa_keygen(true);
1730 }
1731
1732 static int cmd_help(int argc, char *argv[]) {
1733         usage(false);
1734         return 0;
1735 }
1736
1737 static int cmd_version(int argc, char *argv[]) {
1738         if(argc > 1) {
1739                 fprintf(stderr, "Too many arguments!\n");
1740                 return 1;
1741         }
1742
1743         version();
1744         return 0;
1745 }
1746
1747 static int cmd_info(int argc, char *argv[]) {
1748         if(argc != 2) {
1749                 fprintf(stderr, "Invalid number of arguments.\n");
1750                 return 1;
1751         }
1752
1753         if(!connect_tincd(true))
1754                 return 1;
1755
1756         return info(fd, argv[1]);
1757 }
1758
1759 static const char *conffiles[] = {
1760         "tinc.conf",
1761         "tinc-up",
1762         "tinc-down",
1763         "subnet-up",
1764         "subnet-down",
1765         "host-up",
1766         "host-down",
1767         NULL,
1768 };
1769
1770 static int cmd_edit(int argc, char *argv[]) {
1771         if(argc != 2) {
1772                 fprintf(stderr, "Invalid number of arguments.\n");
1773                 return 1;
1774         }
1775
1776         char *filename = NULL;
1777
1778         if(strncmp(argv[1], "hosts" SLASH, 6)) {
1779                 for(int i = 0; conffiles[i]; i++) {
1780                         if(!strcmp(argv[1], conffiles[i])) {
1781                                 xasprintf(&filename, "%s" SLASH "%s", confbase, argv[1]);
1782                                 break;
1783                         }
1784                 }
1785         } else {
1786                 argv[1] += 6;
1787         }
1788
1789         if(!filename) {
1790                 xasprintf(&filename, "%s" SLASH "%s", hosts_dir, argv[1]);
1791                 char *dash = strchr(argv[1], '-');
1792                 if(dash) {
1793                         *dash++ = 0;
1794                         if((strcmp(dash, "up") && strcmp(dash, "down")) || !check_id(argv[1])) {
1795                                 fprintf(stderr, "Invalid configuration filename.\n");
1796                                 return 1;
1797                         }
1798                 }
1799         }
1800
1801         char *command;
1802 #ifndef HAVE_MINGW
1803         xasprintf(&command, "\"%s\" \"%s\"", getenv("VISUAL") ?: getenv("EDITOR") ?: "vi", filename);
1804 #else
1805         xasprintf(&command, "edit \"%s\"", filename);
1806 #endif
1807         int result = system(command);
1808         if(result)
1809                 return result;
1810
1811         // Silently try notifying a running tincd of changes.
1812         if(connect_tincd(false))
1813                 sendline(fd, "%d %d", CONTROL, REQ_RELOAD);
1814
1815         return 0;
1816 }
1817
1818 static int export(const char *name, FILE *out) {
1819         char *filename;
1820         xasprintf(&filename, "%s" SLASH "%s", hosts_dir, name);
1821         FILE *in = fopen(filename, "r");
1822         if(!in) {
1823                 fprintf(stderr, "Could not open configuration file %s: %s\n", filename, strerror(errno));
1824                 return 1;
1825         }
1826
1827         fprintf(out, "Name = %s\n", name);
1828         char buf[4096];
1829         while(fgets(buf, sizeof buf, in)) {
1830                 if(strcspn(buf, "\t =") != 4 || strncasecmp(buf, "Name", 4))
1831                         fputs(buf, out);
1832         }
1833
1834         if(ferror(in)) {
1835                 fprintf(stderr, "Error while reading configuration file %s: %s\n", filename, strerror(errno));
1836                 fclose(in);
1837                 return 1;
1838         }
1839
1840         fclose(in);
1841         return 0;
1842 }
1843
1844 static int cmd_export(int argc, char *argv[]) {
1845         if(argc > 1) {
1846                 fprintf(stderr, "Too many arguments!\n");
1847                 return 1;
1848         }
1849
1850         char *name = get_my_name(true);
1851         if(!name)
1852                 return 1;
1853
1854         int result = export(name, stdout);
1855         if(!tty)
1856                 fclose(stdout);
1857
1858         free(name);
1859         return result;
1860 }
1861
1862 static int cmd_export_all(int argc, char *argv[]) {
1863         if(argc > 1) {
1864                 fprintf(stderr, "Too many arguments!\n");
1865                 return 1;
1866         }
1867
1868         DIR *dir = opendir(hosts_dir);
1869         if(!dir) {
1870                 fprintf(stderr, "Could not open host configuration directory %s: %s\n", hosts_dir, strerror(errno));
1871                 return 1;
1872         }
1873
1874         bool first = true;
1875         int result = 0;
1876         struct dirent *ent;
1877
1878         while((ent = readdir(dir))) {
1879                 if(!check_id(ent->d_name))
1880                         continue;
1881
1882                 if(first)
1883                         first = false;
1884                 else
1885                         printf("#---------------------------------------------------------------#\n");
1886
1887                 result |= export(ent->d_name, stdout);
1888         }
1889
1890         closedir(dir);
1891         if(!tty)
1892                 fclose(stdout);
1893         return result;
1894 }
1895
1896 static int cmd_import(int argc, char *argv[]) {
1897         if(argc > 1) {
1898                 fprintf(stderr, "Too many arguments!\n");
1899                 return 1;
1900         }
1901
1902         FILE *in = stdin;
1903         FILE *out = NULL;
1904
1905         char buf[4096];
1906         char name[4096];
1907         char *filename = NULL;
1908         int count = 0;
1909         bool firstline = true;
1910
1911         while(fgets(buf, sizeof buf, in)) {
1912                 if(sscanf(buf, "Name = %s", name) == 1) {
1913                         firstline = false;
1914
1915                         if(!check_id(name)) {
1916                                 fprintf(stderr, "Invalid Name in input!\n");
1917                                 return 1;
1918                         }
1919
1920                         if(out)
1921                                 fclose(out);
1922
1923                         free(filename);
1924                         xasprintf(&filename, "%s" SLASH "%s", hosts_dir, name);
1925
1926                         if(!force && !access(filename, F_OK)) {
1927                                 fprintf(stderr, "Host configuration file %s already exists, skipping.\n", filename);
1928                                 out = NULL;
1929                                 continue;
1930                         }
1931
1932                         out = fopen(filename, "w");
1933                         if(!out) {
1934                                 fprintf(stderr, "Error creating configuration file %s: %s\n", filename, strerror(errno));
1935                                 return 1;
1936                         }
1937
1938                         count++;
1939                         continue;
1940                 } else if(firstline) {
1941                         fprintf(stderr, "Junk at the beginning of the input, ignoring.\n");
1942                         firstline = false;
1943                 }
1944
1945
1946                 if(!strcmp(buf, "#---------------------------------------------------------------#\n"))
1947                         continue;
1948
1949                 if(out) {
1950                         if(fputs(buf, out) < 0) {
1951                                 fprintf(stderr, "Error writing to host configuration file %s: %s\n", filename, strerror(errno));
1952                                 return 1;
1953                         }
1954                 }
1955         }
1956
1957         if(out)
1958                 fclose(out);
1959
1960         if(count) {
1961                 fprintf(stderr, "Imported %d host configuration files.\n", count);
1962                 return 0;
1963         } else {
1964                 fprintf(stderr, "No host configuration files imported.\n");
1965                 return 1;
1966         }
1967 }
1968
1969 static int cmd_exchange(int argc, char *argv[]) {
1970         return cmd_export(argc, argv) ?: cmd_import(argc, argv);
1971 }
1972
1973 static int cmd_exchange_all(int argc, char *argv[]) {
1974         return cmd_export_all(argc, argv) ?: cmd_import(argc, argv);
1975 }
1976
1977 static const struct {
1978         const char *command;
1979         int (*function)(int argc, char *argv[]);
1980         bool hidden;
1981 } commands[] = {
1982         {"start", cmd_start},
1983         {"stop", cmd_stop},
1984         {"restart", cmd_restart},
1985         {"reload", cmd_reload},
1986         {"dump", cmd_dump},
1987         {"purge", cmd_purge},
1988         {"debug", cmd_debug},
1989         {"retry", cmd_retry},
1990         {"connect", cmd_connect},
1991         {"disconnect", cmd_disconnect},
1992         {"top", cmd_top},
1993         {"pcap", cmd_pcap},
1994         {"log", cmd_log},
1995         {"pid", cmd_pid},
1996         {"config", cmd_config, true},
1997         {"add", cmd_config},
1998         {"del", cmd_config},
1999         {"get", cmd_config},
2000         {"set", cmd_config},
2001         {"init", cmd_init},
2002         {"generate-keys", cmd_generate_keys},
2003         {"generate-rsa-keys", cmd_generate_rsa_keys},
2004         {"generate-ecdsa-keys", cmd_generate_ecdsa_keys},
2005         {"help", cmd_help},
2006         {"version", cmd_version},
2007         {"info", cmd_info},
2008         {"edit", cmd_edit},
2009         {"export", cmd_export},
2010         {"export-all", cmd_export_all},
2011         {"import", cmd_import},
2012         {"exchange", cmd_exchange},
2013         {"exchange-all", cmd_exchange_all},
2014         {"invite", cmd_invite},
2015         {"join", cmd_join},
2016         {NULL, NULL},
2017 };
2018
2019 #ifdef HAVE_READLINE
2020 static char *complete_command(const char *text, int state) {
2021         static int i;
2022
2023         if(!state)
2024                 i = 0;
2025         else
2026                 i++;
2027
2028         while(commands[i].command) {
2029                 if(!commands[i].hidden && !strncasecmp(commands[i].command, text, strlen(text)))
2030                         return xstrdup(commands[i].command);
2031                 i++;
2032         }
2033
2034         return NULL;
2035 }
2036
2037 static char *complete_dump(const char *text, int state) {
2038         const char *matches[] = {"reachable", "nodes", "edges", "subnets", "connections", "graph", NULL};
2039         static int i;
2040
2041         if(!state)
2042                 i = 0;
2043         else
2044                 i++;
2045
2046         while(matches[i]) {
2047                 if(!strncasecmp(matches[i], text, strlen(text)))
2048                         return xstrdup(matches[i]);
2049                 i++;
2050         }
2051
2052         return NULL;
2053 }
2054
2055 static char *complete_config(const char *text, int state) {
2056         static int i;
2057
2058         if(!state)
2059                 i = 0;
2060         else
2061                 i++;
2062
2063         while(variables[i].name) {
2064                 char *dot = strchr(text, '.');
2065                 if(dot) {
2066                         if((variables[i].type & VAR_HOST) && !strncasecmp(variables[i].name, dot + 1, strlen(dot + 1))) {
2067                                 char *match;
2068                                 xasprintf(&match, "%.*s.%s", (int)(dot - text), text, variables[i].name);
2069                                 return match;
2070                         }
2071                 } else {
2072                         if(!strncasecmp(variables[i].name, text, strlen(text)))
2073                                 return xstrdup(variables[i].name);
2074                 }
2075                 i++;
2076         }
2077
2078         return NULL;
2079 }
2080
2081 static char *complete_info(const char *text, int state) {
2082         static int i;
2083         if(!state) {
2084                 i = 0;
2085                 if(!connect_tincd(false))
2086                         return NULL;
2087                 // Check the list of nodes
2088                 sendline(fd, "%d %d", CONTROL, REQ_DUMP_NODES);
2089                 sendline(fd, "%d %d", CONTROL, REQ_DUMP_SUBNETS);
2090         }
2091
2092         while(recvline(fd, line, sizeof line)) {
2093                 char item[4096];
2094                 int n = sscanf(line, "%d %d %s", &code, &req, item);
2095                 if(n == 2) {
2096                         i++;
2097                         if(i >= 2)
2098                                 break;
2099                         else
2100                                 continue;
2101                 }
2102
2103                 if(n != 3) {
2104                         fprintf(stderr, "Unable to parse dump from tincd, n = %d, i = %d.\n", n, i);
2105                         break;
2106                 }
2107
2108                 if(!strncmp(item, text, strlen(text)))
2109                         return xstrdup(strip_weight(item));
2110         }
2111
2112         return NULL;
2113 }
2114
2115 static char *complete_nothing(const char *text, int state) {
2116         return NULL;
2117 }
2118
2119 static char **completion (const char *text, int start, int end) {
2120         char **matches = NULL;
2121
2122         if(!start)
2123                 matches = rl_completion_matches(text, complete_command);
2124         else if(!strncasecmp(rl_line_buffer, "dump ", 5))
2125                 matches = rl_completion_matches(text, complete_dump);
2126         else if(!strncasecmp(rl_line_buffer, "add ", 4))
2127                 matches = rl_completion_matches(text, complete_config);
2128         else if(!strncasecmp(rl_line_buffer, "del ", 4))
2129                 matches = rl_completion_matches(text, complete_config);
2130         else if(!strncasecmp(rl_line_buffer, "get ", 4))
2131                 matches = rl_completion_matches(text, complete_config);
2132         else if(!strncasecmp(rl_line_buffer, "set ", 4))
2133                 matches = rl_completion_matches(text, complete_config);
2134         else if(!strncasecmp(rl_line_buffer, "info ", 5))
2135                 matches = rl_completion_matches(text, complete_info);
2136
2137         return matches;
2138 }
2139 #endif
2140
2141 static int cmd_shell(int argc, char *argv[]) {
2142         char *prompt;
2143         xasprintf(&prompt, "%s> ", identname);
2144         int result = 0;
2145         char buf[4096];
2146         char *line = NULL;
2147         int maxargs = argc + 16;
2148         char **nargv = xmalloc(maxargs * sizeof *nargv);
2149
2150         for(int i = 0; i < argc; i++)
2151                 nargv[i] = argv[i];
2152
2153 #ifdef HAVE_READLINE
2154         rl_readline_name = "tinc";
2155         rl_completion_entry_function = complete_nothing;
2156         rl_attempted_completion_function = completion;
2157         rl_filename_completion_desired = 0;
2158         char *copy = NULL;
2159 #endif
2160
2161         while(true) {
2162 #ifdef HAVE_READLINE
2163                 if(tty) {
2164                         free(copy);
2165                         free(line);
2166                         rl_basic_word_break_characters = "\t\n ";
2167                         line = readline(prompt);
2168                         if(line)
2169                                 copy = xstrdup(line);
2170                 } else {
2171                         line = fgets(buf, sizeof buf, stdin);
2172                 }
2173 #else
2174                 if(tty)
2175                         fputs(prompt, stdout);
2176
2177                 line = fgets(buf, sizeof buf, stdin);
2178 #endif
2179
2180                 if(!line)
2181                         break;
2182
2183                 /* Ignore comments */
2184
2185                 if(*line == '#')
2186                         continue;
2187
2188                 /* Split */
2189
2190                 int nargc = argc;
2191                 char *p = line + strspn(line, " \t\n");
2192                 char *next = strtok(p, " \t\n");
2193
2194                 while(p && *p) {
2195                         if(nargc >= maxargs) {
2196                                 fprintf(stderr, "next %p '%s', p %p '%s'\n", next, next, p, p);
2197                                 abort();
2198                                 maxargs *= 2;
2199                                 nargv = xrealloc(nargv, maxargs * sizeof *nargv);
2200                         }
2201
2202                         nargv[nargc++] = p;
2203                         p = next;
2204                         next = strtok(NULL, " \t\n");
2205                 }
2206
2207                 if(nargc == argc)
2208                         continue;
2209
2210                 if(!strcasecmp(nargv[argc], "exit") || !strcasecmp(nargv[argc], "quit"))
2211                         return result;
2212
2213                 bool found = false;
2214
2215                 for(int i = 0; commands[i].command; i++) {
2216                         if(!strcasecmp(nargv[argc], commands[i].command)) {
2217                                 result |= commands[i].function(nargc - argc - 1, nargv + argc + 1);
2218                                 found = true;
2219                                 break;
2220                         }
2221                 }
2222
2223 #ifdef HAVE_READLINE
2224                 if(tty && found)
2225                         add_history(copy);
2226 #endif
2227
2228                 if(!found) {
2229                         fprintf(stderr, "Unknown command `%s'.\n", nargv[argc]);
2230                         result |= 1;
2231                 }
2232         }
2233
2234         free(nargv);
2235
2236         if(tty)
2237                 printf("\n");
2238         return result;
2239 }
2240
2241
2242 int main(int argc, char *argv[]) {
2243         program_name = argv[0];
2244         orig_argv = argv;
2245         orig_argc = argc;
2246
2247         if(!parse_options(argc, argv))
2248                 return 1;
2249
2250         make_names();
2251         xasprintf(&tinc_conf, "%s" SLASH "tinc.conf", confbase);
2252         xasprintf(&hosts_dir, "%s" SLASH "hosts", confbase);
2253
2254         if(show_version) {
2255                 version();
2256                 return 0;
2257         }
2258
2259         if(show_help) {
2260                 usage(false);
2261                 return 0;
2262         }
2263
2264         crypto_init();
2265
2266         tty = isatty(0) && isatty(1);
2267
2268         if(optind >= argc)
2269                 return cmd_shell(argc, argv);
2270
2271         for(int i = 0; commands[i].command; i++) {
2272                 if(!strcasecmp(argv[optind], commands[i].command))
2273                         return commands[i].function(argc - optind, argv + optind);
2274         }
2275
2276         fprintf(stderr, "Unknown command `%s'.\n", argv[optind]);
2277         usage(true);
2278         return 1;
2279 }