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         if(!recvline(fd, line, sizeof line) || sscanf(line, "%d %d %d", &code, &req, &result) != 3 || code != CONTROL || req != REQ_STOP || result) {
 838                 fprintf(stderr, "Could not stop tinc daemon.\n");
 839                 return 1;
 840         }
 841
 842         // Wait for tincd to close the connection...
 843         fd_set r;
 844         FD_ZERO(&r);
 845         FD_SET(fd, &r);
 846         select(fd + 1, &r, NULL, NULL, NULL);
 847 #else
 848         if(!remove_service())
 849                 return 1;
 850 #endif
 851         close(fd);
 852         pid = 0;
 853         fd = -1;
 854
 855         return 0;
 856 }
 857
 858 static int cmd_restart(int argc, char *argv[]) {
 859         cmd_stop(argc, argv);
 860         return cmd_start(argc, argv);
 861 }
 862
 863 static int cmd_reload(int argc, char *argv[]) {
 864         if(argc > 1) {
 865                 fprintf(stderr, "Too many arguments!\n");
 866                 return 1;
 867         }
 868
 869         if(!connect_tincd(true))
 870                 return 1;
 871
 872         sendline(fd, "%d %d", CONTROL, REQ_RELOAD);
 873         if(!recvline(fd, line, sizeof line) || sscanf(line, "%d %d %d", &code, &req, &result) != 3 || code != CONTROL || req != REQ_RELOAD || result) {
 874                 fprintf(stderr, "Could not reload configuration.\n");
 875                 return 1;
 876         }
 877
 878         return 0;
 879
 880 }
 881
 882 static int cmd_dump(int argc, char *argv[]) {
 883         bool only_reachable = false;
 884
 885         if(argc > 2 && !strcasecmp(argv[1], "reachable")) {
 886                 if(strcasecmp(argv[2], "nodes")) {
 887                         fprintf(stderr, "`reachable' only supported for nodes.\n");
 888                         usage(true);
 889                         return 1;
 890                 }
 891                 only_reachable = true;
 892                 argv++;
 893                 argc--;
 894         }
 895
 896         if(argc != 2) {
 897                 fprintf(stderr, "Invalid number of arguments.\n");
 898                 usage(true);
 899                 return 1;
 900         }
 901
 902         if(!connect_tincd(true))
 903                 return 1;
 904
 905         int do_graph = 0;
 906
 907         if(!strcasecmp(argv[1], "nodes"))
 908                 sendline(fd, "%d %d", CONTROL, REQ_DUMP_NODES);
 909         else if(!strcasecmp(argv[1], "edges"))
 910                 sendline(fd, "%d %d", CONTROL, REQ_DUMP_EDGES);
 911         else if(!strcasecmp(argv[1], "subnets"))
 912                 sendline(fd, "%d %d", CONTROL, REQ_DUMP_SUBNETS);
 913         else if(!strcasecmp(argv[1], "connections"))
 914                 sendline(fd, "%d %d", CONTROL, REQ_DUMP_CONNECTIONS);
 915         else if(!strcasecmp(argv[1], "graph")) {
 916                 sendline(fd, "%d %d", CONTROL, REQ_DUMP_NODES);
 917                 sendline(fd, "%d %d", CONTROL, REQ_DUMP_EDGES);
 918                 do_graph = 1;
 919         } else if(!strcasecmp(argv[1], "digraph")) {
 920                 sendline(fd, "%d %d", CONTROL, REQ_DUMP_NODES);
 921                 sendline(fd, "%d %d", CONTROL, REQ_DUMP_EDGES);
 922                 do_graph = 2;
 923         } else {
 924                 fprintf(stderr, "Unknown dump type '%s'.\n", argv[1]);
 925                 usage(true);
 926                 return 1;
 927         }
 928
 929         if(do_graph == 1)
 930                 printf("graph {\n");
 931         else if(do_graph == 2)
 932                 printf("digraph {\n");
 933
 934         while(recvline(fd, line, sizeof line)) {
 935                 char node1[4096], node2[4096];
 936                 int n = sscanf(line, "%d %d %s %s", &code, &req, node1, node2);
 937                 if(n == 2) {
 938                         if(do_graph && req == REQ_DUMP_NODES)
 939                                 continue;
 940                         else {
 941                                 if(do_graph)
 942                                         printf("}\n");
 943                                 return 0;
 944                         }
 945                 }
 946                 if(n < 2)
 947                         break;
 948
 949                 char node[4096];
 950                 char from[4096];
 951                 char to[4096];
 952                 char subnet[4096];
 953                 char host[4096];
 954                 char port[4096];
 955                 char via[4096];
 956                 char nexthop[4096];
 957                 int cipher, digest, maclength, compression, distance, socket, weight;
 958                 short int pmtu, minmtu, maxmtu;
 959                 unsigned int options, status_int;
 960                 node_status_t status;
 961                 long int last_state_change;
 962
 963                 switch(req) {
 964                         case REQ_DUMP_NODES: {
 965                                 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);
 966                                 if(n != 16) {
 967                                         fprintf(stderr, "Unable to parse node dump from tincd: %s\n", line);
 968                                         return 1;
 969                                 }
 970
 971                                 memcpy(&status, &status_int, sizeof status);
 972
 973                                 if(do_graph) {
 974                                         const char *color = "black";
 975                                         if(!strcmp(host, "MYSELF"))
 976                                                 color = "green";
 977                                         else if(!status.reachable)
 978                                                 color = "red";
 979                                         else if(strcmp(via, node))
 980                                                 color = "orange";
 981                                         else if(!status.validkey)
 982                                                 color = "black";
 983                                         else if(minmtu > 0)
 984                                                 color = "green";
 985                                         printf(" %s [label = \"%s\", color = \"%s\"%s];\n", node, node, color, strcmp(host, "MYSELF") ? "" : ", style = \"filled\"");
 986                                 } else {
 987                                         if(only_reachable && !status.reachable)
 988                                                 continue;
 989                                         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",
 990                                                         node, host, port, cipher, digest, maclength, compression, options, status_int, nexthop, via, distance, pmtu, minmtu, maxmtu);
 991                                 }
 992                         } break;
 993
 994                         case REQ_DUMP_EDGES: {
 995                                 int n = sscanf(line, "%*d %*d %s %s %s port %s %x %d", from, to, host, port, &options, &weight);
 996                                 if(n != 6) {
 997                                         fprintf(stderr, "Unable to parse edge dump from tincd.\n");
 998                                         return 1;
 999                                 }
1000
1001                                 if(do_graph) {
1002                                         float w = 1 + 65536.0 / weight;
1003                                         if(do_graph == 1 && strcmp(node1, node2) > 0)
1004                                                 printf(" %s -- %s [w = %f, weight = %f];\n", node1, node2, w, w);
1005                                         else if(do_graph == 2)
1006                                                 printf(" %s -> %s [w = %f, weight = %f];\n", node1, node2, w, w);
1007                                 } else {
1008                                         printf("%s to %s at %s port %s options %x weight %d\n", from, to, host, port, options, weight);
1009                                 }
1010                         } break;
1011
1012                         case REQ_DUMP_SUBNETS: {
1013                                 int n = sscanf(line, "%*d %*d %s %s", subnet, node);
1014                                 if(n != 2) {
1015                                         fprintf(stderr, "Unable to parse subnet dump from tincd.\n");
1016                                         return 1;
1017                                 }
1018                                 printf("%s owner %s\n", strip_weight(subnet), node);
1019                         } break;
1020
1021                         case REQ_DUMP_CONNECTIONS: {
1022                                 int n = sscanf(line, "%*d %*d %s %s port %s %x %d %x", node, host, port, &options, &socket, &status_int);
1023                                 if(n != 6) {
1024                                         fprintf(stderr, "Unable to parse connection dump from tincd.\n");
1025                                         return 1;
1026                                 }
1027                                 printf("%s at %s port %s options %x socket %d status %x\n", node, host, port, options, socket, status_int);
1028                         } break;
1029
1030                         default:
1031                                 fprintf(stderr, "Unable to parse dump from tincd.\n");
1032                                 return 1;
1033                 }
1034         }
1035
1036         fprintf(stderr, "Error receiving dump.\n");
1037         return 1;
1038 }
1039
1040 static int cmd_purge(int argc, char *argv[]) {
1041         if(argc > 1) {
1042                 fprintf(stderr, "Too many arguments!\n");
1043                 return 1;
1044         }
1045
1046         if(!connect_tincd(true))
1047                 return 1;
1048
1049         sendline(fd, "%d %d", CONTROL, REQ_PURGE);
1050         if(!recvline(fd, line, sizeof line) || sscanf(line, "%d %d %d", &code, &req, &result) != 3 || code != CONTROL || req != REQ_PURGE || result) {
1051                 fprintf(stderr, "Could not purge old information.\n");
1052                 return 1;
1053         }
1054
1055         return 0;
1056 }
1057
1058 static int cmd_debug(int argc, char *argv[]) {
1059         if(argc != 2) {
1060                 fprintf(stderr, "Invalid number of arguments.\n");
1061                 return 1;
1062         }
1063
1064         if(!connect_tincd(true))
1065                 return 1;
1066
1067         int debuglevel = atoi(argv[1]);
1068         int origlevel;
1069
1070         sendline(fd, "%d %d %d", CONTROL, REQ_SET_DEBUG, debuglevel);
1071         if(!recvline(fd, line, sizeof line) || sscanf(line, "%d %d %d", &code, &req, &origlevel) != 3 || code != CONTROL || req != REQ_SET_DEBUG) {
1072                 fprintf(stderr, "Could not set debug level.\n");
1073                 return 1;
1074         }
1075
1076         fprintf(stderr, "Old level %d, new level %d.\n", origlevel, debuglevel);
1077         return 0;
1078 }
1079
1080 static int cmd_retry(int argc, char *argv[]) {
1081         if(argc > 1) {
1082                 fprintf(stderr, "Too many arguments!\n");
1083                 return 1;
1084         }
1085
1086         if(!connect_tincd(true))
1087                 return 1;
1088
1089         sendline(fd, "%d %d", CONTROL, REQ_RETRY);
1090         if(!recvline(fd, line, sizeof line) || sscanf(line, "%d %d %d", &code, &req, &result) != 3 || code != CONTROL || req != REQ_RETRY || result) {
1091                 fprintf(stderr, "Could not retry outgoing connections.\n");
1092                 return 1;
1093         }
1094
1095         return 0;
1096 }
1097
1098 static int cmd_connect(int argc, char *argv[]) {
1099         if(argc != 2) {
1100                 fprintf(stderr, "Invalid number of arguments.\n");
1101                 return 1;
1102         }
1103
1104         if(!check_id(argv[1])) {
1105                 fprintf(stderr, "Invalid name for node.\n");
1106                 return 1;
1107         }
1108
1109         if(!connect_tincd(true))
1110                 return 1;
1111
1112         sendline(fd, "%d %d %s", CONTROL, REQ_CONNECT, argv[1]);
1113         if(!recvline(fd, line, sizeof line) || sscanf(line, "%d %d %d", &code, &req, &result) != 3 || code != CONTROL || req != REQ_CONNECT || result) {
1114                 fprintf(stderr, "Could not connect to %s.\n", argv[1]);
1115                 return 1;
1116         }
1117
1118         return 0;
1119 }
1120
1121 static int cmd_disconnect(int argc, char *argv[]) {
1122         if(argc != 2) {
1123                 fprintf(stderr, "Invalid number of arguments.\n");
1124                 return 1;
1125         }
1126
1127         if(!check_id(argv[1])) {
1128                 fprintf(stderr, "Invalid name for node.\n");
1129                 return 1;
1130         }
1131
1132         if(!connect_tincd(true))
1133                 return 1;
1134
1135         sendline(fd, "%d %d %s", CONTROL, REQ_DISCONNECT, argv[1]);
1136         if(!recvline(fd, line, sizeof line) || sscanf(line, "%d %d %d", &code, &req, &result) != 3 || code != CONTROL || req != REQ_DISCONNECT || result) {
1137                 fprintf(stderr, "Could not disconnect %s.\n", argv[1]);
1138                 return 1;
1139         }
1140
1141         return 0;
1142 }
1143
1144 static int cmd_top(int argc, char *argv[]) {
1145         if(argc > 1) {
1146                 fprintf(stderr, "Too many arguments!\n");
1147                 return 1;
1148         }
1149
1150 #ifdef HAVE_CURSES
1151         if(!connect_tincd(true))
1152                 return 1;
1153
1154         top(fd);
1155         return 0;
1156 #else
1157         fprintf(stderr, "This version of tincctl was compiled without support for the curses library.\n");
1158         return 1;
1159 #endif
1160 }
1161
1162 static int cmd_pcap(int argc, char *argv[]) {
1163         if(argc > 2) {
1164                 fprintf(stderr, "Too many arguments!\n");
1165                 return 1;
1166         }
1167
1168         if(!connect_tincd(true))
1169                 return 1;
1170
1171         pcap(fd, stdout, argc > 1 ? atoi(argv[1]) : 0);
1172         return 0;
1173 }
1174
1175 static int cmd_log(int argc, char *argv[]) {
1176         if(argc > 2) {
1177                 fprintf(stderr, "Too many arguments!\n");
1178                 return 1;
1179         }
1180
1181         if(!connect_tincd(true))
1182                 return 1;
1183
1184         logcontrol(fd, stdout, argc > 1 ? atoi(argv[1]) : -1);
1185         return 0;
1186 }
1187
1188 static int cmd_pid(int argc, char *argv[]) {
1189         if(argc > 1) {
1190                 fprintf(stderr, "Too many arguments!\n");
1191                 return 1;
1192         }
1193
1194         if(!connect_tincd(true) && !pid)
1195                 return 1;
1196
1197         printf("%d\n", pid);
1198         return 0;
1199 }
1200
1201 static int rstrip(char *value) {
1202         int len = strlen(value);
1203         while(len && strchr("\t\r\n ", value[len - 1]))
1204                 value[--len] = 0;
1205         return len;
1206 }
1207
1208 static char *get_my_name() {
1209         FILE *f = fopen(tinc_conf, "r");
1210         if(!f) {
1211                 fprintf(stderr, "Could not open %s: %s\n", tinc_conf, strerror(errno));
1212                 return NULL;
1213         }
1214
1215         char buf[4096];
1216         char *value;
1217         while(fgets(buf, sizeof buf, f)) {
1218                 int len = strcspn(buf, "\t =");
1219                 value = buf + len;
1220                 value += strspn(value, "\t ");
1221                 if(*value == '=') {
1222                         value++;
1223                         value += strspn(value, "\t ");
1224                 }
1225                 if(!rstrip(value))
1226                         continue;
1227                 buf[len] = 0;
1228                 if(strcasecmp(buf, "Name"))
1229                         continue;
1230                 if(*value) {
1231                         fclose(f);
1232                         return strdup(value);
1233                 }
1234         }
1235
1236         fclose(f);
1237         fprintf(stderr, "Could not find Name in %s.\n", tinc_conf);
1238         return NULL;
1239 }
1240
1241 #define VAR_SERVER 1    /* Should be in tinc.conf */
1242 #define VAR_HOST 2      /* Can be in host config file */
1243 #define VAR_MULTIPLE 4  /* Multiple statements allowed */
1244 #define VAR_OBSOLETE 8  /* Should not be used anymore */
1245
1246 static struct {
1247         const char *name;
1248         int type;
1249 } const variables[] = {
1250         /* Server configuration */
1251         {"AddressFamily", VAR_SERVER},
1252         {"AutoConnect", VAR_SERVER},
1253         {"BindToAddress", VAR_SERVER | VAR_MULTIPLE},
1254         {"BindToInterface", VAR_SERVER},
1255         {"Broadcast", VAR_SERVER},
1256         {"ConnectTo", VAR_SERVER | VAR_MULTIPLE},
1257         {"DecrementTTL", VAR_SERVER},
1258         {"Device", VAR_SERVER},
1259         {"DeviceType", VAR_SERVER},
1260         {"DirectOnly", VAR_SERVER},
1261         {"ECDSAPrivateKeyFile", VAR_SERVER},
1262         {"ExperimentalProtocol", VAR_SERVER},
1263         {"Forwarding", VAR_SERVER},
1264         {"GraphDumpFile", VAR_SERVER | VAR_OBSOLETE},
1265         {"Hostnames", VAR_SERVER},
1266         {"IffOneQueue", VAR_SERVER},
1267         {"Interface", VAR_SERVER},
1268         {"KeyExpire", VAR_SERVER},
1269         {"LocalDiscovery", VAR_SERVER},
1270         {"MACExpire", VAR_SERVER},
1271         {"MaxOutputBufferSize", VAR_SERVER},
1272         {"MaxTimeout", VAR_SERVER},
1273         {"Mode", VAR_SERVER},
1274         {"Name", VAR_SERVER},
1275         {"PingInterval", VAR_SERVER},
1276         {"PingTimeout", VAR_SERVER},
1277         {"PriorityInheritance", VAR_SERVER},
1278         {"PrivateKey", VAR_SERVER | VAR_OBSOLETE},
1279         {"PrivateKeyFile", VAR_SERVER},
1280         {"ProcessPriority", VAR_SERVER},
1281         {"Proxy", VAR_SERVER},
1282         {"ReplayWindow", VAR_SERVER},
1283         {"ScriptsExtension", VAR_SERVER},
1284         {"ScriptsInterpreter", VAR_SERVER},
1285         {"StrictSubnets", VAR_SERVER},
1286         {"TunnelServer", VAR_SERVER},
1287         {"UDPRcvBuf", VAR_SERVER},
1288         {"UDPSndBuf", VAR_SERVER},
1289         {"VDEGroup", VAR_SERVER},
1290         {"VDEPort", VAR_SERVER},
1291         /* Host configuration */
1292         {"Address", VAR_HOST | VAR_MULTIPLE},
1293         {"Cipher", VAR_SERVER | VAR_HOST},
1294         {"ClampMSS", VAR_SERVER | VAR_HOST},
1295         {"Compression", VAR_SERVER | VAR_HOST},
1296         {"Digest", VAR_SERVER | VAR_HOST},
1297         {"ECDSAPublicKey", VAR_HOST},
1298         {"ECDSAPublicKeyFile", VAR_SERVER | VAR_HOST},
1299         {"IndirectData", VAR_SERVER | VAR_HOST},
1300         {"MACLength", VAR_SERVER | VAR_HOST},
1301         {"PMTU", VAR_SERVER | VAR_HOST},
1302         {"PMTUDiscovery", VAR_SERVER | VAR_HOST},
1303         {"Port", VAR_HOST},
1304         {"PublicKey", VAR_HOST | VAR_OBSOLETE},
1305         {"PublicKeyFile", VAR_SERVER | VAR_HOST | VAR_OBSOLETE},
1306         {"Subnet", VAR_HOST | VAR_MULTIPLE},
1307         {"TCPOnly", VAR_SERVER | VAR_HOST},
1308         {"Weight", VAR_HOST},
1309         {NULL, 0}
1310 };
1311
1312 static int cmd_config(int argc, char *argv[]) {
1313         if(argc < 2) {
1314                 fprintf(stderr, "Invalid number of arguments.\n");
1315                 return 1;
1316         }
1317
1318         int action = -2;
1319         if(!strcasecmp(argv[1], "get")) {
1320                 argv++, argc--;
1321         } else if(!strcasecmp(argv[1], "add")) {
1322                 argv++, argc--, action = 1;
1323         } else if(!strcasecmp(argv[1], "del")) {
1324                 argv++, argc--, action = -1;
1325         } else if(!strcasecmp(argv[1], "replace") || !strcasecmp(argv[1], "set") || !strcasecmp(argv[1], "change")) {
1326                 argv++, argc--, action = 0;
1327         }
1328
1329         if(argc < 2) {
1330                 fprintf(stderr, "Invalid number of arguments.\n");
1331                 return 1;
1332         }
1333
1334         // Concatenate the rest of the command line
1335         strncpy(line, argv[1], sizeof line - 1);
1336         for(int i = 2; i < argc; i++) {
1337                 strncat(line, " ", sizeof line - 1 - strlen(line));
1338                 strncat(line, argv[i], sizeof line - 1 - strlen(line));
1339         }
1340
1341         // Liberal parsing into node name, variable name and value.
1342         char *node = NULL;
1343         char *variable;
1344         char *value;
1345         int len;
1346
1347         len = strcspn(line, "\t =");
1348         value = line + len;
1349         value += strspn(value, "\t ");
1350         if(*value == '=') {
1351                 value++;
1352                 value += strspn(value, "\t ");
1353         }
1354         line[len] = '\0';
1355         variable = strchr(line, '.');
1356         if(variable) {
1357                 node = line;
1358                 *variable++ = 0;
1359         } else {
1360                 variable = line;
1361         }
1362
1363         if(!*variable) {
1364                 fprintf(stderr, "No variable given.\n");
1365                 return 1;
1366         }
1367
1368         if(action >= 0 && !*value) {
1369                 fprintf(stderr, "No value for variable given.\n");
1370                 return 1;
1371         }
1372
1373         if(action < -1 && *value)
1374                 action = 0;
1375
1376         /* Some simple checks. */
1377         bool found = false;
1378
1379         for(int i = 0; variables[i].name; i++) {
1380                 if(strcasecmp(variables[i].name, variable))
1381                         continue;
1382
1383                 found = true;
1384                 variable = (char *)variables[i].name;
1385
1386                 /* Discourage use of obsolete variables. */
1387
1388                 if(variables[i].type & VAR_OBSOLETE && action >= 0) {
1389                         if(force) {
1390                                 fprintf(stderr, "Warning: %s is an obsolete variable!\n", variable);
1391                         } else {
1392                                 fprintf(stderr, "%s is an obsolete variable! Use --force to use it anyway.\n", variable);
1393                                 return 1;
1394                         }
1395                 }
1396
1397                 /* Don't put server variables in host config files */
1398
1399                 if(node && !(variables[i].type & VAR_HOST) && action >= 0) {
1400                         if(force) {
1401                                 fprintf(stderr, "Warning: %s is not a host configuration variable!\n", variable);
1402                         } else {
1403                                 fprintf(stderr, "%s is not a host configuration variable! Use --force to use it anyway.\n", variable);
1404                                 return 1;
1405                         }
1406                 }
1407
1408                 /* Should this go into our own host config file? */
1409
1410                 if(!node && !(variables[i].type & VAR_SERVER)) {
1411                         node = get_my_name();
1412                         if(!node)
1413                                 return 1;
1414                 }
1415
1416                 break;
1417         }
1418
1419         if(node && !check_id(node)) {
1420                 fprintf(stderr, "Invalid name for node.\n");
1421                 return 1;
1422         }
1423
1424         if(!found) {
1425                 if(force || action < 0) {
1426                         fprintf(stderr, "Warning: %s is not a known configuration variable!\n", variable);
1427                 } else {
1428                         fprintf(stderr, "%s: is not a known configuration variable! Use --force to use it anyway.\n", variable);
1429                         return 1;
1430                 }
1431         }
1432
1433         // Open the right configuration file.
1434         char *filename;
1435         if(node)
1436                 xasprintf(&filename, "%s" SLASH "%s", hosts_dir, node);
1437         else
1438                 filename = tinc_conf;
1439
1440         FILE *f = fopen(filename, "r");
1441         if(!f) {
1442                 if(action < 0 || errno != ENOENT) {
1443                         fprintf(stderr, "Could not open configuration file %s: %s\n", filename, strerror(errno));
1444                         return 1;
1445                 }
1446
1447                 // If it doesn't exist, create it.
1448                 f = fopen(filename, "a+");
1449                 if(!f) {
1450                         fprintf(stderr, "Could not create configuration file %s: %s\n", filename, strerror(errno));
1451                         return 1;
1452                 } else {
1453                         fprintf(stderr, "Created configuration file %s.\n", filename);
1454                 }
1455         }
1456
1457         char *tmpfile = NULL;
1458         FILE *tf = NULL;
1459
1460         if(action >= -1) {
1461                 xasprintf(&tmpfile, "%s.config.tmp", filename);
1462                 tf = fopen(tmpfile, "w");
1463                 if(!tf) {
1464                         fprintf(stderr, "Could not open temporary file %s: %s\n", tmpfile, strerror(errno));
1465                         fclose(f);
1466                         return 1;
1467                 }
1468         }
1469
1470         // Copy the file, making modifications on the fly, unless we are just getting a value.
1471         char buf1[4096];
1472         char buf2[4096];
1473         bool set = false;
1474         bool removed = false;
1475         found = false;
1476
1477         while(fgets(buf1, sizeof buf1, f)) {
1478                 buf1[sizeof buf1 - 1] = 0;
1479                 strncpy(buf2, buf1, sizeof buf2);
1480
1481                 // Parse line in a simple way
1482                 char *bvalue;
1483                 int len;
1484
1485                 len = strcspn(buf2, "\t =");
1486                 bvalue = buf2 + len;
1487                 bvalue += strspn(bvalue, "\t ");
1488                 if(*bvalue == '=') {
1489                         bvalue++;
1490                         bvalue += strspn(bvalue, "\t ");
1491                 }
1492                 rstrip(bvalue);
1493                 buf2[len] = '\0';
1494
1495                 // Did it match?
1496                 if(!strcasecmp(buf2, variable)) {
1497                         // Get
1498                         if(action < -1) {
1499                                 found = true;
1500                                 printf("%s\n", bvalue);
1501                         // Del
1502                         } else if(action == -1) {
1503                                 if(!*value || !strcasecmp(bvalue, value)) {
1504                                         removed = true;
1505                                         continue;
1506                                 }
1507                         // Set
1508                         } else if(action == 0) {
1509                                 // Already set? Delete the rest...
1510                                 if(set)
1511                                         continue;
1512                                 // Otherwise, replace.
1513                                 if(fprintf(tf, "%s = %s\n", variable, value) < 0) {
1514                                         fprintf(stderr, "Error writing to temporary file %s: %s\n", tmpfile, strerror(errno));
1515                                         return 1;
1516                                 }
1517                                 set = true;
1518                                 continue;
1519                         }
1520                 }
1521
1522                 if(action >= -1) {
1523                         // Copy original line...
1524                         if(fputs(buf1, tf) < 0) {
1525                                 fprintf(stderr, "Error writing to temporary file %s: %s\n", tmpfile, strerror(errno));
1526                                 return 1;
1527                         }
1528
1529                         // Add newline if it is missing...
1530                         if(*buf1 && buf1[strlen(buf1) - 1] != '\n') {
1531                                 if(fputc('\n', tf) < 0) {
1532                                         fprintf(stderr, "Error writing to temporary file %s: %s\n", tmpfile, strerror(errno));
1533                                         return 1;
1534                                 }
1535                         }
1536                 }
1537         }
1538
1539         // Make sure we read everything...
1540         if(ferror(f) || !feof(f)) {
1541                 fprintf(stderr, "Error while reading from configuration file %s: %s\n", filename, strerror(errno));
1542                 return 1;
1543         }
1544
1545         if(fclose(f)) {
1546                 fprintf(stderr, "Error closing configuration file %s: %s\n", filename, strerror(errno));
1547                 return 1;
1548         }
1549
1550         // Add new variable if necessary.
1551         if(action > 0 || (action == 0 && !set)) {
1552                 if(fprintf(tf, "%s = %s\n", variable, value) < 0) {
1553                         fprintf(stderr, "Error writing to temporary file %s: %s\n", tmpfile, strerror(errno));
1554                         return 1;
1555                 }
1556         }
1557
1558         if(action < -1) {
1559                 if(!found)
1560                         fprintf(stderr, "No matching configuration variables found.\n");
1561                 return 0;
1562         }
1563
1564         // Make sure we wrote everything...
1565         if(fclose(tf)) {
1566                 fprintf(stderr, "Error closing temporary file %s: %s\n", tmpfile, strerror(errno));
1567                 return 1;
1568         }
1569
1570         // Could we find what we had to remove?
1571         if(action < 0 && !removed) {
1572                 remove(tmpfile);
1573                 fprintf(stderr, "No configuration variables deleted.\n");
1574                 return *value;
1575         }
1576
1577         // Replace the configuration file with the new one
1578 #ifdef HAVE_MINGW
1579         if(remove(filename)) {
1580                 fprintf(stderr, "Error replacing file %s: %s\n", filename, strerror(errno));
1581                 return 1;
1582         }
1583 #endif
1584         if(rename(tmpfile, filename)) {
1585                 fprintf(stderr, "Error renaming temporary file %s to configuration file %s: %s\n", tmpfile, filename, strerror(errno));
1586                 return 1;
1587         }
1588
1589         // Silently try notifying a running tincd of changes.
1590         if(connect_tincd(false))
1591                 sendline(fd, "%d %d", CONTROL, REQ_RELOAD);
1592
1593         return 0;
1594 }
1595
1596 bool check_id(const char *name) {
1597         if(!name || !*name)
1598                 return false;
1599
1600         for(int i = 0; i < strlen(name); i++) {
1601                 if(!isalnum(name[i]) && name[i] != '_')
1602                         return false;
1603         }
1604
1605         return true;
1606 }
1607
1608 static int cmd_init(int argc, char *argv[]) {
1609         if(!access(tinc_conf, F_OK)) {
1610                 fprintf(stderr, "Configuration file %s already exists!\n", tinc_conf);
1611                 return 1;
1612         }
1613
1614         if(argc > 2) {
1615                 fprintf(stderr, "Too many arguments!\n");
1616                 return 1;
1617         } else if(argc < 2) {
1618                 if(tty) {
1619                         char buf[1024];
1620                         fprintf(stdout, "Enter the Name you want your tinc node to have: ");
1621                         fflush(stdout);
1622                         if(!fgets(buf, sizeof buf, stdin)) {
1623                                 fprintf(stderr, "Error while reading stdin: %s\n", strerror(errno));
1624                                 return 1;
1625                         }
1626                         int len = rstrip(buf);
1627                         if(!len) {
1628                                 fprintf(stderr, "No name given!\n");
1629                                 return 1;
1630                         }
1631                         name = strdup(buf);
1632                 } else {
1633                         fprintf(stderr, "No Name given!\n");
1634                         return 1;
1635                 }
1636         } else {
1637                 name = strdup(argv[1]);
1638                 if(!*name) {
1639                         fprintf(stderr, "No Name given!\n");
1640                         return 1;
1641                 }
1642         }
1643
1644         if(!check_id(name)) {
1645                 fprintf(stderr, "Invalid Name! Only a-z, A-Z, 0-9 and _ are allowed characters.\n");
1646                 return 1;
1647         }
1648
1649         if(mkdir(confdir, 0755) && errno != EEXIST) {
1650                 fprintf(stderr, "Could not create directory %s: %s\n", CONFDIR, strerror(errno));
1651                 return 1;
1652         }
1653
1654         if(mkdir(confbase, 0755) && errno != EEXIST) {
1655                 fprintf(stderr, "Could not create directory %s: %s\n", confbase, strerror(errno));
1656                 return 1;
1657         }
1658
1659         if(mkdir(hosts_dir, 0755) && errno != EEXIST) {
1660                 fprintf(stderr, "Could not create directory %s: %s\n", hosts_dir, strerror(errno));
1661                 return 1;
1662         }
1663
1664         FILE *f = fopen(tinc_conf, "w");
1665         if(!f) {
1666                 fprintf(stderr, "Could not create file %s: %s\n", tinc_conf, strerror(errno));
1667                 return 1;
1668         }
1669
1670         fprintf(f, "Name = %s\n", name);
1671         fclose(f);
1672
1673         if(!rsa_keygen(2048, false) || !ecdsa_keygen(false))
1674                 return 1;
1675
1676 #ifndef HAVE_MINGW
1677         char *filename;
1678         xasprintf(&filename, "%s" SLASH "tinc-up", confbase);
1679         if(access(filename, F_OK)) {
1680                 FILE *f = fopen(filename, "w");
1681                 if(!f) {
1682                         fprintf(stderr, "Could not create file %s: %s\n", filename, strerror(errno));
1683                         return 1;
1684                 }
1685                 fchmod(fileno(f), 0755);
1686                 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");
1687                 fclose(f);
1688         }
1689 #endif
1690
1691         return 0;
1692
1693 }
1694
1695 static int cmd_generate_keys(int argc, char *argv[]) {
1696         if(argc > 2) {
1697                 fprintf(stderr, "Too many arguments!\n");
1698                 return 1;
1699         }
1700
1701         return !(rsa_keygen(argc > 1 ? atoi(argv[1]) : 2048, true) && ecdsa_keygen(true));
1702 }
1703
1704 static int cmd_generate_rsa_keys(int argc, char *argv[]) {
1705         if(argc > 2) {
1706                 fprintf(stderr, "Too many arguments!\n");
1707                 return 1;
1708         }
1709
1710         return !rsa_keygen(argc > 1 ? atoi(argv[1]) : 2048, true);
1711 }
1712
1713 static int cmd_generate_ecdsa_keys(int argc, char *argv[]) {
1714         if(argc > 1) {
1715                 fprintf(stderr, "Too many arguments!\n");
1716                 return 1;
1717         }
1718
1719         return !ecdsa_keygen(true);
1720 }
1721
1722 static int cmd_help(int argc, char *argv[]) {
1723         usage(false);
1724         return 0;
1725 }
1726
1727 static int cmd_version(int argc, char *argv[]) {
1728         if(argc > 1) {
1729                 fprintf(stderr, "Too many arguments!\n");
1730                 return 1;
1731         }
1732
1733         version();
1734         return 0;
1735 }
1736
1737 static int cmd_info(int argc, char *argv[]) {
1738         if(argc != 2) {
1739                 fprintf(stderr, "Invalid number of arguments.\n");
1740                 return 1;
1741         }
1742
1743         if(!connect_tincd(true))
1744                 return 1;
1745
1746         return info(fd, argv[1]);
1747 }
1748
1749 static const char *conffiles[] = {
1750         "tinc.conf",
1751         "tinc-up",
1752         "tinc-down",
1753         "subnet-up",
1754         "subnet-down",
1755         "host-up",
1756         "host-down",
1757         NULL,
1758 };
1759
1760 static int cmd_edit(int argc, char *argv[]) {
1761         if(argc != 2) {
1762                 fprintf(stderr, "Invalid number of arguments.\n");
1763                 return 1;
1764         }
1765
1766         char *filename = NULL;
1767
1768         if(strncmp(argv[1], "hosts" SLASH, 6)) {
1769                 for(int i = 0; conffiles[i]; i++) {
1770                         if(!strcmp(argv[1], conffiles[i])) {
1771                                 xasprintf(&filename, "%s" SLASH "%s", confbase, argv[1]);
1772                                 break;
1773                         }
1774                 }
1775         } else {
1776                 argv[1] += 6;
1777         }
1778
1779         if(!filename) {
1780                 xasprintf(&filename, "%s" SLASH "%s", hosts_dir, argv[1]);
1781                 char *dash = strchr(argv[1], '-');
1782                 if(dash) {
1783                         *dash++ = 0;
1784                         if((strcmp(dash, "up") && strcmp(dash, "down")) || !check_id(argv[1])) {
1785                                 fprintf(stderr, "Invalid configuration filename.\n");
1786                                 return 1;
1787                         }
1788                 }
1789         }
1790
1791         char *command;
1792 #ifndef HAVE_MINGW
1793         xasprintf(&command, "\"%s\" \"%s\"", getenv("VISUAL") ?: getenv("EDITOR") ?: "vi", filename);
1794 #else
1795         xasprintf(&command, "edit \"%s\"", filename);
1796 #endif
1797         int result = system(command);
1798         if(result)
1799                 return result;
1800
1801         // Silently try notifying a running tincd of changes.
1802         if(connect_tincd(false))
1803                 sendline(fd, "%d %d", CONTROL, REQ_RELOAD);
1804
1805         return 0;
1806 }
1807
1808 static int export(const char *name, FILE *out) {
1809         char *filename;
1810         xasprintf(&filename, "%s" SLASH "%s", hosts_dir, name);
1811         FILE *in = fopen(filename, "r");
1812         if(!in) {
1813                 fprintf(stderr, "Could not open configuration file %s: %s\n", filename, strerror(errno));
1814                 return 1;
1815         }
1816
1817         fprintf(out, "Name = %s\n", name);
1818         char buf[4096];
1819         while(fgets(buf, sizeof buf, in)) {
1820                 if(strcspn(buf, "\t =") != 4 || strncasecmp(buf, "Name", 4))
1821                         fputs(buf, out);
1822         }
1823
1824         if(ferror(in)) {
1825                 fprintf(stderr, "Error while reading configuration file %s: %s\n", filename, strerror(errno));
1826                 fclose(in);
1827                 return 1;
1828         }
1829
1830         fclose(in);
1831         return 0;
1832 }
1833
1834 static int cmd_export(int argc, char *argv[]) {
1835         if(argc > 1) {
1836                 fprintf(stderr, "Too many arguments!\n");
1837                 return 1;
1838         }
1839
1840         char *name = get_my_name();
1841         if(!name)
1842                 return 1;
1843
1844         int result = export(name, stdout);
1845         if(!tty)
1846                 fclose(stdout);
1847         return result;
1848 }
1849
1850 static int cmd_export_all(int argc, char *argv[]) {
1851         if(argc > 1) {
1852                 fprintf(stderr, "Too many arguments!\n");
1853                 return 1;
1854         }
1855
1856         DIR *dir = opendir(hosts_dir);
1857         if(!dir) {
1858                 fprintf(stderr, "Could not open host configuration directory %s: %s\n", hosts_dir, strerror(errno));
1859                 return 1;
1860         }
1861
1862         bool first = true;
1863         int result = 0;
1864         struct dirent *ent;
1865
1866         while((ent = readdir(dir))) {
1867                 if(!check_id(ent->d_name))
1868                         continue;
1869
1870                 if(first)
1871                         first = false;
1872                 else
1873                         printf("#---------------------------------------------------------------#\n");
1874
1875                 result |= export(ent->d_name, stdout);
1876         }
1877
1878         closedir(dir);
1879         if(!tty)
1880                 fclose(stdout);
1881         return result;
1882 }
1883
1884 static int cmd_import(int argc, char *argv[]) {
1885         if(argc > 1) {
1886                 fprintf(stderr, "Too many arguments!\n");
1887                 return 1;
1888         }
1889
1890         FILE *in = stdin;
1891         FILE *out = NULL;
1892
1893         char buf[4096];
1894         char name[4096];
1895         char *filename = NULL;
1896         int count = 0;
1897         bool firstline = true;
1898
1899         while(fgets(buf, sizeof buf, in)) {
1900                 if(sscanf(buf, "Name = %s", name) == 1) {
1901                         firstline = false;
1902
1903                         if(!check_id(name)) {
1904                                 fprintf(stderr, "Invalid Name in input!\n");
1905                                 return 1;
1906                         }
1907
1908                         if(out)
1909                                 fclose(out);
1910
1911                         free(filename);
1912                         xasprintf(&filename, "%s" SLASH "%s", hosts_dir, name);
1913
1914                         if(!force && !access(filename, F_OK)) {
1915                                 fprintf(stderr, "Host configuration file %s already exists, skipping.\n", filename);
1916                                 out = NULL;
1917                                 continue;
1918                         }
1919
1920                         out = fopen(filename, "w");
1921                         if(!out) {
1922                                 fprintf(stderr, "Error creating configuration file %s: %s\n", filename, strerror(errno));
1923                                 return 1;
1924                         }
1925
1926                         count++;
1927                         continue;
1928                 } else if(firstline) {
1929                         fprintf(stderr, "Junk at the beginning of the input, ignoring.\n");
1930                         firstline = false;
1931                 }
1932
1933
1934                 if(!strcmp(buf, "#---------------------------------------------------------------#\n"))
1935                         continue;
1936
1937                 if(out) {
1938                         if(fputs(buf, out) < 0) {
1939                                 fprintf(stderr, "Error writing to host configuration file %s: %s\n", filename, strerror(errno));
1940                                 return 1;
1941                         }
1942                 }
1943         }
1944
1945         if(out)
1946                 fclose(out);
1947
1948         if(count) {
1949                 fprintf(stderr, "Imported %d host configuration files.\n", count);
1950                 return 0;
1951         } else {
1952                 fprintf(stderr, "No host configuration files imported.\n");
1953                 return 1;
1954         }
1955 }
1956
1957 static int cmd_exchange(int argc, char *argv[]) {
1958         return cmd_export(argc, argv) ?: cmd_import(argc, argv);
1959 }
1960
1961 static int cmd_exchange_all(int argc, char *argv[]) {
1962         return cmd_export_all(argc, argv) ?: cmd_import(argc, argv);
1963 }
1964
1965 static const struct {
1966         const char *command;
1967         int (*function)(int argc, char *argv[]);
1968 } commands[] = {
1969         {"start", cmd_start},
1970         {"stop", cmd_stop},
1971         {"restart", cmd_restart},
1972         {"reload", cmd_reload},
1973         {"dump", cmd_dump},
1974         {"purge", cmd_purge},
1975         {"debug", cmd_debug},
1976         {"retry", cmd_retry},
1977         {"connect", cmd_connect},
1978         {"disconnect", cmd_disconnect},
1979         {"top", cmd_top},
1980         {"pcap", cmd_pcap},
1981         {"log", cmd_log},
1982         {"pid", cmd_pid},
1983         {"config", cmd_config},
1984         {"init", cmd_init},
1985         {"generate-keys", cmd_generate_keys},
1986         {"generate-rsa-keys", cmd_generate_rsa_keys},
1987         {"generate-ecdsa-keys", cmd_generate_ecdsa_keys},
1988         {"help", cmd_help},
1989         {"version", cmd_version},
1990         {"info", cmd_info},
1991         {"edit", cmd_edit},
1992         {"export", cmd_export},
1993         {"export-all", cmd_export_all},
1994         {"import", cmd_import},
1995         {"exchange", cmd_exchange},
1996         {"exchange-all", cmd_exchange_all},
1997         {NULL, NULL},
1998 };
1999
2000 #ifdef HAVE_READLINE
2001 static char *complete_command(const char *text, int state) {
2002         static int i;
2003
2004         if(!state)
2005                 i = 0;
2006         else
2007                 i++;
2008
2009         while(commands[i].command) {
2010                 if(!strncasecmp(commands[i].command, text, strlen(text)))
2011                         return xstrdup(commands[i].command);
2012                 i++;
2013         }
2014
2015         return NULL;
2016 }
2017
2018 static char *complete_dump(const char *text, int state) {
2019         const char *matches[] = {"reachable", "nodes", "edges", "subnets", "connections", "graph", NULL};
2020         static int i;
2021
2022         if(!state)
2023                 i = 0;
2024         else
2025                 i++;
2026
2027         while(matches[i]) {
2028                 if(!strncasecmp(matches[i], text, strlen(text)))
2029                         return xstrdup(matches[i]);
2030                 i++;
2031         }
2032
2033         return NULL;
2034 }
2035
2036 static char *complete_config(const char *text, int state) {
2037         const char *sub[] = {"get", "set", "add", "del"};
2038         static int i;
2039         if(!state) {
2040                 i = 0;
2041                 if(!strchr(rl_line_buffer + 7, ' '))
2042                         i = -4;
2043                 else {
2044                         bool found = false;
2045                         for(int i = 0; i < 4; i++) {
2046                                 if(!strncasecmp(rl_line_buffer + 7, sub[i], strlen(sub[i])) && rl_line_buffer[7 + strlen(sub[i])] == ' ') {
2047                                         found = true;
2048                                         break;
2049                                 }
2050                         }
2051                         if(!found)
2052                                 return NULL;
2053                 }
2054         } else {
2055                 i++;
2056         }
2057
2058         while(i < 0 || variables[i].name) {
2059                 if(i < 0 && !strncasecmp(sub[i + 4], text, strlen(text)))
2060                         return xstrdup(sub[i + 4]);
2061                 if(i >= 0) {
2062                         char *dot = strchr(text, '.');
2063                         if(dot) {
2064                                 if((variables[i].type & VAR_HOST) && !strncasecmp(variables[i].name, dot + 1, strlen(dot + 1))) {
2065                                         char *match;
2066                                         xasprintf(&match, "%.*s.%s", dot - text, text, variables[i].name);
2067                                         return match;
2068                                 }
2069                         } else {
2070                                 if(!strncasecmp(variables[i].name, text, strlen(text)))
2071                                         return xstrdup(variables[i].name);
2072                         }
2073                 }
2074                 i++;
2075         }
2076
2077         return NULL;
2078 }
2079
2080 static char *complete_info(const char *text, int state) {
2081         static int i;
2082         if(!state) {
2083                 i = 0;
2084                 if(!connect_tincd(false))
2085                         return NULL;
2086                 // Check the list of nodes
2087                 sendline(fd, "%d %d", CONTROL, REQ_DUMP_NODES);
2088                 sendline(fd, "%d %d", CONTROL, REQ_DUMP_SUBNETS);
2089         }
2090
2091         while(recvline(fd, line, sizeof line)) {
2092                 char item[4096];
2093                 int n = sscanf(line, "%d %d %s", &code, &req, item);
2094                 if(n == 2) {
2095                         i++;
2096                         if(i >= 2)
2097                                 break;
2098                         else
2099                                 continue;
2100                 }
2101
2102                 if(n != 3) {
2103                         fprintf(stderr, "Unable to parse dump from tincd, n = %d, i = %d.\n", n, i);
2104                         break;
2105                 }
2106
2107                 if(!strncmp(item, text, strlen(text)))
2108                         return xstrdup(strip_weight(item));
2109         }
2110
2111         return NULL;
2112 }
2113
2114 static char *complete_nothing(const char *text, int state) {
2115         return NULL;
2116 }
2117
2118 static char **completion (const char *text, int start, int end) {
2119         char **matches = NULL;
2120
2121         if(!start)
2122                 matches = rl_completion_matches(text, complete_command);
2123         else if(!strncasecmp(rl_line_buffer, "dump ", 5))
2124                 matches = rl_completion_matches(text, complete_dump);
2125         else if(!strncasecmp(rl_line_buffer, "config ", 7))
2126                 matches = rl_completion_matches(text, complete_config);
2127         else if(!strncasecmp(rl_line_buffer, "info ", 5))
2128                 matches = rl_completion_matches(text, complete_info);
2129
2130         return matches;
2131 }
2132 #endif
2133
2134 static int cmd_shell(int argc, char *argv[]) {
2135         char *prompt;
2136         xasprintf(&prompt, "%s> ", identname);
2137         int result = 0;
2138         char buf[4096];
2139         char *line = NULL;
2140         int maxargs = argc + 16;
2141         char **nargv = xmalloc(maxargs * sizeof *nargv);
2142
2143         for(int i = 0; i < argc; i++)
2144                 nargv[i] = argv[i];
2145
2146 #ifdef HAVE_READLINE
2147         rl_readline_name = "tinc";
2148         rl_completion_entry_function = complete_nothing;
2149         rl_attempted_completion_function = completion;
2150         rl_filename_completion_desired = 0;
2151         char *copy = NULL;
2152 #endif
2153
2154         while(true) {
2155 #ifdef HAVE_READLINE
2156                 if(tty) {
2157                         free(copy);
2158                         free(line);
2159                         rl_basic_word_break_characters = "\t\n ";
2160                         line = readline(prompt);
2161                         if(line)
2162                                 copy = xstrdup(line);
2163                 } else {
2164                         line = fgets(buf, sizeof buf, stdin);
2165                 }
2166 #else
2167                 if(tty)
2168                         fputs(prompt, stdout);
2169
2170                 line = fgets(buf, sizeof buf, stdin);
2171 #endif
2172
2173                 if(!line)
2174                         break;
2175
2176                 /* Ignore comments */
2177
2178                 if(*line == '#')
2179                         continue;
2180
2181                 /* Split */
2182
2183                 int nargc = argc;
2184                 char *p = line + strspn(line, " \t\n");
2185                 char *next = strtok(p, " \t\n");
2186
2187                 while(p && *p) {
2188                         if(nargc >= maxargs) {
2189                                 fprintf(stderr, "next %p '%s', p %p '%s'\n", next, next, p, p);
2190                                 abort();
2191                                 maxargs *= 2;
2192                                 nargv = xrealloc(nargv, maxargs * sizeof *nargv);
2193                         }
2194
2195                         nargv[nargc++] = p;
2196                         p = next;
2197                         next = strtok(NULL, " \t\n");
2198                 }
2199
2200                 if(nargc == argc)
2201                         continue;
2202
2203                 if(!strcasecmp(nargv[argc], "exit") || !strcasecmp(nargv[argc], "quit"))
2204                         return result;
2205
2206                 bool found = false;
2207
2208                 for(int i = 0; commands[i].command; i++) {
2209                         if(!strcasecmp(nargv[argc], commands[i].command)) {
2210                                 result |= commands[i].function(nargc - argc - 1, nargv + argc + 1);
2211                                 found = true;
2212                                 break;
2213                         }
2214                 }
2215
2216 #ifdef HAVE_READLINE
2217                 if(tty && found)
2218                         add_history(copy);
2219 #endif
2220
2221                 if(!found) {
2222                         fprintf(stderr, "Unknown command `%s'.\n", nargv[argc]);
2223                         result |= 1;
2224                 }
2225         }
2226
2227         free(nargv);
2228
2229         if(tty)
2230                 printf("\n");
2231         return result;
2232 }
2233
2234
2235 int main(int argc, char *argv[]) {
2236         program_name = argv[0];
2237         orig_argv = argv;
2238         orig_argc = argc;
2239
2240         if(!parse_options(argc, argv))
2241                 return 1;
2242
2243         make_names();
2244         xasprintf(&tinc_conf, "%s" SLASH "tinc.conf", confbase);
2245         xasprintf(&hosts_dir, "%s" SLASH "hosts", confbase);
2246
2247         if(show_version) {
2248                 version();
2249                 return 0;
2250         }
2251
2252         if(show_help) {
2253                 usage(false);
2254                 return 0;
2255         }
2256
2257         tty = isatty(0) && isatty(1);
2258
2259         if(optind >= argc)
2260                 return cmd_shell(argc, argv);
2261
2262         for(int i = 0; commands[i].command; i++) {
2263                 if(!strcasecmp(argv[optind], commands[i].command))
2264                         return commands[i].function(argc - optind, argv + optind);
2265         }
2266
2267         fprintf(stderr, "Unknown command `%s'.\n", argv[optind]);
2268         usage(true);
2269         return 1;
2270 }