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 "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 static char **orig_argv;
  43 static int orig_argc;
  44
  45 /* If nonzero, display usage information and exit. */
  46 static bool show_help = false;
  47
  48 /* If nonzero, print the version on standard output and exit.  */
  49 static bool show_version = false;
  50
  51 static char *name = NULL;
  52 static char controlcookie[1025];
  53 char *tinc_conf = NULL;
  54 char *hosts_dir = NULL;
  55 struct timeval now;
  56
  57 // Horrible global variables...
  58 static int pid = 0;
  59 int fd = -1;
  60 char line[4096];
  61 static int code;
  62 static int req;
  63 static int result;
  64 static bool force = false;
  65 bool tty = true;
  66 bool confbasegiven = false;
  67 bool netnamegiven = false;
  68 char *scriptinterpreter = NULL;
  69 char *scriptextension = "";
  70
  71 static struct option const long_options[] = {
  72         {"config", required_argument, NULL, 'c'},
  73         {"net", required_argument, NULL, 'n'},
  74         {"help", no_argument, NULL, 1},
  75         {"version", no_argument, NULL, 2},
  76         {"pidfile", required_argument, NULL, 3},
  77         {"force", no_argument, NULL, 4},
  78         {NULL, 0, NULL, 0}
  79 };
  80
  81 static void version(void) {
  82         printf("%s version %s (built %s %s, protocol %d.%d)\n", PACKAGE,
  83                    VERSION, __DATE__, __TIME__, PROT_MAJOR, PROT_MINOR);
  84         printf("Copyright (C) 1998-2012 Ivo Timmermans, Guus Sliepen and others.\n"
  85                         "See the AUTHORS file for a complete list.\n\n"
  86                         "tinc comes with ABSOLUTELY NO WARRANTY.  This is free software,\n"
  87                         "and you are welcome to redistribute it under certain conditions;\n"
  88                         "see the file COPYING for details.\n");
  89 }
  90
  91 static void usage(bool status) {
  92         if(status) {
  93                 fprintf(stderr, "Try `%s --help\' for more information.\n", program_name);
  94         } else {
  95                 printf("Usage: %s [options] command\n\n", program_name);
  96                 printf("Valid options are:\n"
  97                                 "  -c, --config=DIR        Read configuration options from DIR.\n"
  98                                 "  -n, --net=NETNAME       Connect to net NETNAME.\n"
  99                                 "      --pidfile=FILENAME  Read control cookie from FILENAME.\n"
 100                                 "      --help              Display this help and exit.\n"
 101                                 "      --version           Output version information and exit.\n"
 102                                 "\n"
 103                                 "Valid commands are:\n"
 104                                 "  init [name]                Create initial configuration files.\n"
 105                                 "  get VARIABLE               Print current value of VARIABLE\n"
 106                                 "  set VARIABLE VALUE         Set VARIABLE to VALUE\n"
 107                                 "  add VARIABLE VALUE         Add VARIABLE with the given VALUE\n"
 108                                 "  del VARIABLE [VALUE]       Remove VARIABLE [only ones with watching VALUE]\n"
 109                                 "  start [tincd options]      Start tincd.\n"
 110                                 "  stop                       Stop tincd.\n"
 111                                 "  restart [tincd options]    Restart tincd.\n"
 112                                 "  reload                     Partially reload configuration of running tincd.\n"
 113                                 "  pid                        Show PID of currently running tincd.\n"
 114                                 "  generate-keys [bits]       Generate new RSA and ECDSA public/private keypairs.\n"
 115                                 "  generate-rsa-keys [bits]   Generate a new RSA public/private keypair.\n"
 116                                 "  generate-ecdsa-keys        Generate a new ECDSA public/private keypair.\n"
 117                                 "  dump                       Dump a list of one of the following things:\n"
 118                                 "    [reachable] nodes        - all known nodes in the VPN\n"
 119                                 "    edges                    - all known connections in the VPN\n"
 120                                 "    subnets                  - all known subnets in the VPN\n"
 121                                 "    connections              - all meta connections with ourself\n"
 122                                 "    [di]graph                - graph of the VPN in dotty format\n"
 123                                 "  info NODE|SUBNET|ADDRESS   Give information about a particular NODE, SUBNET or ADDRESS.\n"
 124                                 "  purge                      Purge unreachable nodes\n"
 125                                 "  debug N                    Set debug level\n"
 126                                 "  retry                      Retry all outgoing connections\n"
 127                                 "  disconnect NODE            Close meta connection with NODE\n"
 128 #ifdef HAVE_CURSES
 129                                 "  top                        Show real-time statistics\n"
 130 #endif
 131                                 "  pcap [snaplen]             Dump traffic in pcap format [up to snaplen bytes per packet]\n"
 132                                 "  log [level]                Dump log output [up to the specified level]\n"
 133                                 "  export                     Export host configuration of local node to standard output\n"
 134                                 "  export-all                 Export all host configuration files to standard output\n"
 135                                 "  import [--force]           Import host configuration file(s) from standard input\n"
 136                                 "  exchange [--force]         Same as export followed by import\n"
 137                                 "  exchange-all [--force]     Same as export-all followed by import\n"
 138                                 "  invite NODE [...]          Generate an invitation for NODE\n"
 139                                 "  join INVITATION            Join a VPN using an INVITIATION\n"
 140                                 "\n");
 141                 printf("Report bugs to tinc@tinc-vpn.org.\n");
 142         }
 143 }
 144
 145 static bool parse_options(int argc, char **argv) {
 146         int r;
 147         int option_index = 0;
 148
 149         while((r = getopt_long(argc, argv, "+c:n:", long_options, &option_index)) != EOF) {
 150                 switch (r) {
 151                         case 0:   /* long option */
 152                                 break;
 153
 154                         case 'c': /* config file */
 155                                 confbase = xstrdup(optarg);
 156                                 confbasegiven = true;
 157                                 break;
 158
 159                         case 'n': /* net name given */
 160                                 netname = xstrdup(optarg);
 161                                 break;
 162
 163                         case 1:   /* show help */
 164                                 show_help = true;
 165                                 break;
 166
 167                         case 2:   /* show version */
 168                                 show_version = true;
 169                                 break;
 170
 171                         case 3:   /* open control socket here */
 172                                 pidfilename = xstrdup(optarg);
 173                                 break;
 174
 175                         case 4:   /* force */
 176                                 force = true;
 177                                 break;
 178
 179                         case '?': /* wrong options */
 180                                 usage(true);
 181                                 return false;
 182
 183                         default:
 184                                 break;
 185                 }
 186         }
 187
 188         if(!netname && (netname = getenv("NETNAME")))
 189                 netname = xstrdup(netname);
 190
 191         /* netname "." is special: a "top-level name" */
 192
 193         if(netname && (!*netname || !strcmp(netname, "."))) {
 194                 free(netname);
 195                 netname = NULL;
 196         }
 197
 198         if(netname && (strpbrk(netname, "\\/") || *netname == '.')) {
 199                 fprintf(stderr, "Invalid character in netname!\n");
 200                 return false;
 201         }
 202
 203         return true;
 204 }
 205
 206 /* Open a file with the desired permissions, minus the umask.
 207    Also, if we want to create an executable file, we call fchmod()
 208    to set the executable bits. */
 209
 210 FILE *fopenmask(const char *filename, const char *mode, mode_t perms) {
 211         mode_t mask = umask(0);
 212         perms &= ~mask;
 213         umask(~perms);
 214         FILE *f = fopen(filename, mode);
 215 #ifdef HAVE_FCHMOD
 216         if((perms & 0444) && f)
 217                 fchmod(fileno(f), perms);
 218 #endif
 219         umask(mask);
 220         return f;
 221 }
 222
 223 static void disable_old_keys(const char *filename, const char *what) {
 224         char tmpfile[PATH_MAX] = "";
 225         char buf[1024];
 226         bool disabled = false;
 227         bool block = false;
 228         bool error = false;
 229         FILE *r, *w;
 230
 231         r = fopen(filename, "r");
 232         if(!r)
 233                 return;
 234
 235         snprintf(tmpfile, sizeof tmpfile, "%s.tmp", filename);
 236
 237         struct stat st = {.st_mode = 0600};
 238         fstat(fileno(r), &st);
 239         w = fopenmask(tmpfile, "w", st.st_mode);
 240
 241         while(fgets(buf, sizeof buf, r)) {
 242                 if(!block && !strncmp(buf, "-----BEGIN ", 11)) {
 243                         if((strstr(buf, " EC ") && strstr(what, "ECDSA")) || (strstr(buf, " RSA ") && strstr(what, "RSA"))) {
 244                                 disabled = true;
 245                                 block = true;
 246                         }
 247                 }
 248
 249                 bool ecdsapubkey = !strncasecmp(buf, "ECDSAPublicKey", 14) && strchr(" \t=", buf[14]) && strstr(what, "ECDSA");
 250
 251                 if(ecdsapubkey)
 252                         disabled = true;
 253
 254                 if(w) {
 255                         if(block || ecdsapubkey)
 256                                 fputc('#', w);
 257                         if(fputs(buf, w) < 0) {
 258                                 error = true;
 259                                 break;
 260                         }
 261                 }
 262
 263                 if(block && !strncmp(buf, "-----END ", 9))
 264                         block = false;
 265         }
 266
 267         if(w)
 268                 if(fclose(w) < 0)
 269                         error = true;
 270         if(ferror(r) || fclose(r) < 0)
 271                 error = true;
 272
 273         if(disabled) {
 274                 if(!w || error) {
 275                         fprintf(stderr, "Warning: old key(s) found, remove them by hand!\n");
 276                         if(w)
 277                                 unlink(tmpfile);
 278                         return;
 279                 }
 280
 281 #ifdef HAVE_MINGW
 282                 // We cannot atomically replace files on Windows.
 283                 char bakfile[PATH_MAX] = "";
 284                 snprintf(bakfile, sizeof bakfile, "%s.bak", filename);
 285                 if(rename(filename, bakfile) || rename(tmpfile, filename)) {
 286                         rename(bakfile, filename);
 287 #else
 288                 if(rename(tmpfile, filename)) {
 289 #endif
 290                         fprintf(stderr, "Warning: old key(s) found, remove them by hand!\n");
 291                 } else  {
 292 #ifdef HAVE_MINGW
 293                         unlink(bakfile);
 294 #endif
 295                         fprintf(stderr, "Warning: old key(s) found and disabled.\n");
 296                 }
 297         }
 298
 299         unlink(tmpfile);
 300 }
 301
 302 static FILE *ask_and_open(const char *filename, const char *what, const char *mode, bool ask, mode_t perms) {
 303         FILE *r;
 304         char *directory;
 305         char buf[PATH_MAX];
 306         char buf2[PATH_MAX];
 307
 308         /* Check stdin and stdout */
 309         if(ask && tty) {
 310                 /* Ask for a file and/or directory name. */
 311                 fprintf(stdout, "Please enter a file to save %s to [%s]: ", what, filename);
 312                 fflush(stdout);
 313
 314                 if(fgets(buf, sizeof buf, stdin) == NULL) {
 315                         fprintf(stderr, "Error while reading stdin: %s\n", strerror(errno));
 316                         return NULL;
 317                 }
 318
 319                 size_t len = strlen(buf);
 320                 if(len)
 321                         buf[--len] = 0;
 322
 323                 if(len)
 324                         filename = buf;
 325         }
 326
 327 #ifdef HAVE_MINGW
 328         if(filename[0] != '\\' && filename[0] != '/' && !strchr(filename, ':')) {
 329 #else
 330         if(filename[0] != '/') {
 331 #endif
 332                 /* The directory is a relative path or a filename. */
 333                 directory = get_current_dir_name();
 334                 snprintf(buf2, sizeof buf2, "%s" SLASH "%s", directory, filename);
 335                 filename = buf2;
 336         }
 337
 338         disable_old_keys(filename, what);
 339
 340         /* Open it first to keep the inode busy */
 341
 342         r = fopenmask(filename, mode, perms);
 343
 344         if(!r) {
 345                 fprintf(stderr, "Error opening file `%s': %s\n", filename, strerror(errno));
 346                 return NULL;
 347         }
 348
 349         return r;
 350 }
 351
 352 /*
 353   Generate a public/private ECDSA keypair, and ask for a file to store
 354   them in.
 355 */
 356 static bool ecdsa_keygen(bool ask) {
 357         ecdsa_t *key;
 358         FILE *f;
 359         char *pubname, *privname;
 360
 361         fprintf(stderr, "Generating ECDSA keypair:\n");
 362
 363         if(!(key = ecdsa_generate())) {
 364                 fprintf(stderr, "Error during key generation!\n");
 365                 return false;
 366         } else
 367                 fprintf(stderr, "Done.\n");
 368
 369         xasprintf(&privname, "%s" SLASH "ecdsa_key.priv", confbase);
 370         f = ask_and_open(privname, "private ECDSA key", "a", ask, 0600);
 371         free(privname);
 372
 373         if(!f)
 374                 return false;
 375
 376         if(!ecdsa_write_pem_private_key(key, f)) {
 377                 fprintf(stderr, "Error writing private key!\n");
 378                 ecdsa_free(key);
 379                 fclose(f);
 380                 return false;
 381         }
 382
 383         fclose(f);
 384
 385         if(name)
 386                 xasprintf(&pubname, "%s" SLASH "hosts" SLASH "%s", confbase, name);
 387         else
 388                 xasprintf(&pubname, "%s" SLASH "ecdsa_key.pub", confbase);
 389
 390         f = ask_and_open(pubname, "public ECDSA key", "a", ask, 0666);
 391         free(pubname);
 392
 393         if(!f)
 394                 return false;
 395
 396         char *pubkey = ecdsa_get_base64_public_key(key);
 397         fprintf(f, "ECDSAPublicKey = %s\n", pubkey);
 398         free(pubkey);
 399
 400         fclose(f);
 401         ecdsa_free(key);
 402
 403         return true;
 404 }
 405
 406 /*
 407   Generate a public/private RSA keypair, and ask for a file to store
 408   them in.
 409 */
 410 static bool rsa_keygen(int bits, bool ask) {
 411         rsa_t *key;
 412         FILE *f;
 413         char *pubname, *privname;
 414
 415         fprintf(stderr, "Generating %d bits keys:\n", bits);
 416
 417         if(!(key = rsa_generate(bits, 0x10001))) {
 418                 fprintf(stderr, "Error during key generation!\n");
 419                 return false;
 420         } else
 421                 fprintf(stderr, "Done.\n");
 422
 423         xasprintf(&privname, "%s" SLASH "rsa_key.priv", confbase);
 424         f = ask_and_open(privname, "private RSA key", "a", ask, 0600);
 425         free(privname);
 426
 427         if(!f)
 428                 return false;
 429
 430         if(!rsa_write_pem_private_key(key, f)) {
 431                 fprintf(stderr, "Error writing private key!\n");
 432                 fclose(f);
 433                 rsa_free(key);
 434                 return false;
 435         }
 436
 437         fclose(f);
 438
 439         if(name)
 440                 xasprintf(&pubname, "%s" SLASH "hosts" SLASH "%s", confbase, name);
 441         else
 442                 xasprintf(&pubname, "%s" SLASH "rsa_key.pub", confbase);
 443
 444         f = ask_and_open(pubname, "public RSA key", "a", ask, 0666);
 445         free(pubname);
 446
 447         if(!f)
 448                 return false;
 449
 450         if(!rsa_write_pem_public_key(key, f)) {
 451                 fprintf(stderr, "Error writing public key!\n");
 452                 fclose(f);
 453                 rsa_free(key);
 454                 return false;
 455         }
 456
 457         fclose(f);
 458         rsa_free(key);
 459
 460         return true;
 461 }
 462
 463 char buffer[4096];
 464 size_t blen = 0;
 465
 466 bool recvline(int fd, char *line, size_t len) {
 467         char *newline = NULL;
 468
 469         if(!fd)
 470                 abort();
 471
 472         while(!(newline = memchr(buffer, '\n', blen))) {
 473                 int result = recv(fd, buffer + blen, sizeof buffer - blen, 0);
 474                 if(result == -1 && errno == EINTR)
 475                         continue;
 476                 else if(result <= 0)
 477                         return false;
 478                 blen += result;
 479         }
 480
 481         if(newline - buffer >= len)
 482                 return false;
 483
 484         len = newline - buffer;
 485
 486         memcpy(line, buffer, len);
 487         line[len] = 0;
 488         memmove(buffer, newline + 1, blen - len - 1);
 489         blen -= len + 1;
 490
 491         return true;
 492 }
 493
 494 bool recvdata(int fd, char *data, size_t len) {
 495         if(len == -1)
 496                 len = blen;
 497
 498         while(blen < len) {
 499                 int result = recv(fd, buffer + blen, sizeof buffer - blen, 0);
 500                 if(result == -1 && errno == EINTR)
 501                         continue;
 502                 else if(result <= 0)
 503                         return false;
 504                 blen += result;
 505         }
 506
 507         memcpy(data, buffer, len);
 508         memmove(buffer, buffer + len, blen - len);
 509         blen -= len;
 510
 511         return true;
 512 }
 513
 514 bool sendline(int fd, char *format, ...) {
 515         static char buffer[4096];
 516         char *p = buffer;
 517         int blen = 0;
 518         va_list ap;
 519
 520         va_start(ap, format);
 521         blen = vsnprintf(buffer, sizeof buffer, format, ap);
 522         va_end(ap);
 523
 524         if(blen < 1 || blen >= sizeof buffer)
 525                 return false;
 526
 527         buffer[blen] = '\n';
 528         blen++;
 529
 530         while(blen) {
 531                 int result = send(fd, p, blen, 0);
 532                 if(result == -1 && errno == EINTR)
 533                         continue;
 534                 else if(result <= 0)
 535                         return false;
 536                 p += result;
 537                 blen -= result;
 538         }
 539
 540         return true;
 541 }
 542
 543 static void pcap(int fd, FILE *out, int snaplen) {
 544         sendline(fd, "%d %d %d", CONTROL, REQ_PCAP, snaplen);
 545         char data[9018];
 546
 547         struct {
 548                 uint32_t magic;
 549                 uint16_t major;
 550                 uint16_t minor;
 551                 uint32_t tz_offset;
 552                 uint32_t tz_accuracy;
 553                 uint32_t snaplen;
 554                 uint32_t ll_type;
 555         } header = {
 556                 0xa1b2c3d4,
 557                 2, 4,
 558                 0, 0,
 559                 snaplen ?: sizeof data,
 560                 1,
 561         };
 562
 563         struct {
 564                 uint32_t tv_sec;
 565                 uint32_t tv_usec;
 566                 uint32_t len;
 567                 uint32_t origlen;
 568         } packet;
 569
 570         struct timeval tv;
 571
 572         fwrite(&header, sizeof header, 1, out);
 573         fflush(out);
 574
 575         char line[32];
 576         while(recvline(fd, line, sizeof line)) {
 577                 int code, req, len;
 578                 int n = sscanf(line, "%d %d %d", &code, &req, &len);
 579                 gettimeofday(&tv, NULL);
 580                 if(n != 3 || code != CONTROL || req != REQ_PCAP || len < 0 || len > sizeof data)
 581                         break;
 582                 if(!recvdata(fd, data, len))
 583                         break;
 584                 packet.tv_sec = tv.tv_sec;
 585                 packet.tv_usec = tv.tv_usec;
 586                 packet.len = len;
 587                 packet.origlen = len;
 588                 fwrite(&packet, sizeof packet, 1, out);
 589                 fwrite(data, len, 1, out);
 590                 fflush(out);
 591         }
 592 }
 593
 594 static void logcontrol(int fd, FILE *out, int level) {
 595         sendline(fd, "%d %d %d", CONTROL, REQ_LOG, level);
 596         char data[1024];
 597         char line[32];
 598
 599         while(recvline(fd, line, sizeof line)) {
 600                 int code, req, len;
 601                 int n = sscanf(line, "%d %d %d", &code, &req, &len);
 602                 if(n != 3 || code != CONTROL || req != REQ_LOG || len < 0 || len > sizeof data)
 603                         break;
 604                 if(!recvdata(fd, data, len))
 605                         break;
 606                 fwrite(data, len, 1, out);
 607                 fputc('\n', out);
 608                 fflush(out);
 609         }
 610 }
 611
 612 #ifdef HAVE_MINGW
 613 static bool remove_service(void) {
 614         SC_HANDLE manager = NULL;
 615         SC_HANDLE service = NULL;
 616         SERVICE_STATUS status = {0};
 617
 618         manager = OpenSCManager(NULL, NULL, SC_MANAGER_ALL_ACCESS);
 619         if(!manager) {
 620                 fprintf(stderr, "Could not open service manager: %s\n", winerror(GetLastError()));
 621                 return false;
 622         }
 623
 624         service = OpenService(manager, identname, SERVICE_ALL_ACCESS);
 625
 626         if(!service) {
 627                 fprintf(stderr, "Could not open %s service: %s\n", identname, winerror(GetLastError()));
 628                 return false;
 629         }
 630
 631         if(!ControlService(service, SERVICE_CONTROL_STOP, &status))
 632                 fprintf(stderr, "Could not stop %s service: %s\n", identname, winerror(GetLastError()));
 633         else
 634                 fprintf(stderr, "%s service stopped\n", identname);
 635
 636         if(!DeleteService(service)) {
 637                 fprintf(stderr, "Could not remove %s service: %s\n", identname, winerror(GetLastError()));
 638                 return false;
 639         }
 640
 641         fprintf(stderr, "%s service removed\n", identname);
 642
 643         return true;
 644 }
 645 #endif
 646
 647 bool connect_tincd(bool verbose) {
 648         if(fd >= 0) {
 649                 fd_set r;
 650                 FD_ZERO(&r);
 651                 FD_SET(fd, &r);
 652                 struct timeval tv = {0, 0};
 653                 if(select(fd + 1, &r, NULL, NULL, &tv)) {
 654                         fprintf(stderr, "Previous connection to tincd lost, reconnecting.\n");
 655                         close(fd);
 656                         fd = -1;
 657                 } else {
 658                         return true;
 659                 }
 660         }
 661
 662         FILE *f = fopen(pidfilename, "r");
 663         if(!f) {
 664                 if(verbose)
 665                         fprintf(stderr, "Could not open pid file %s: %s\n", pidfilename, strerror(errno));
 666                 return false;
 667         }
 668
 669         char host[129];
 670         char port[129];
 671
 672         if(fscanf(f, "%20d %1024s %128s port %128s", &pid, controlcookie, host, port) != 4) {
 673                 if(verbose)
 674                         fprintf(stderr, "Could not parse pid file %s\n", pidfilename);
 675                 fclose(f);
 676                 return false;
 677         }
 678
 679         fclose(f);
 680
 681 #ifndef HAVE_MINGW
 682         struct sockaddr_un sa;
 683         sa.sun_family = AF_UNIX;
 684         strncpy(sa.sun_path, unixsocketname, sizeof sa.sun_path);
 685
 686         fd = socket(AF_UNIX, SOCK_STREAM, 0);
 687         if(fd < 0) {
 688                 if(verbose)
 689                         fprintf(stderr, "Cannot create UNIX socket: %s\n", sockstrerror(sockerrno));
 690                 return false;
 691         }
 692
 693         if(connect(fd, (struct sockaddr *)&sa, sizeof sa) < 0) {
 694                 if(verbose)
 695                         fprintf(stderr, "Cannot connect to UNIX socket %s: %s\n", unixsocketname, sockstrerror(sockerrno));
 696                 close(fd);
 697                 fd = -1;
 698                 return false;
 699         }
 700 #else
 701         struct addrinfo hints = {
 702                 .ai_family = AF_UNSPEC,
 703                 .ai_socktype = SOCK_STREAM,
 704                 .ai_protocol = IPPROTO_TCP,
 705                 .ai_flags = 0,
 706         };
 707
 708         struct addrinfo *res = NULL;
 709
 710         if(getaddrinfo(host, port, &hints, &res) || !res) {
 711                 if(verbose)
 712                         fprintf(stderr, "Cannot resolve %s port %s: %s", host, port, strerror(errno));
 713                 return false;
 714         }
 715
 716         fd = socket(res->ai_family, SOCK_STREAM, IPPROTO_TCP);
 717         if(fd < 0) {
 718                 if(verbose)
 719                         fprintf(stderr, "Cannot create TCP socket: %s\n", sockstrerror(sockerrno));
 720                 return false;
 721         }
 722
 723 #ifdef HAVE_MINGW
 724         unsigned long arg = 0;
 725
 726         if(ioctlsocket(fd, FIONBIO, &arg) != 0) {
 727                 if(verbose)
 728                         fprintf(stderr, "ioctlsocket failed: %s", sockstrerror(sockerrno));
 729         }
 730 #endif
 731
 732         if(connect(fd, res->ai_addr, res->ai_addrlen) < 0) {
 733                 if(verbose)
 734                         fprintf(stderr, "Cannot connect to %s port %s: %s\n", host, port, sockstrerror(sockerrno));
 735                 close(fd);
 736                 fd = -1;
 737                 return false;
 738         }
 739
 740         freeaddrinfo(res);
 741 #endif
 742
 743         char data[4096];
 744         int version;
 745
 746         if(!recvline(fd, line, sizeof line) || sscanf(line, "%d %s %d", &code, data, &version) != 3 || code != 0) {
 747                 if(verbose)
 748                         fprintf(stderr, "Cannot read greeting from control socket: %s\n", sockstrerror(sockerrno));
 749                 close(fd);
 750                 fd = -1;
 751                 return false;
 752         }
 753
 754         sendline(fd, "%d ^%s %d", ID, controlcookie, TINC_CTL_VERSION_CURRENT);
 755
 756         if(!recvline(fd, line, sizeof line) || sscanf(line, "%d %d %d", &code, &version, &pid) != 3 || code != 4 || version != TINC_CTL_VERSION_CURRENT) {
 757                 if(verbose)
 758                         fprintf(stderr, "Could not fully establish control socket connection\n");
 759                 close(fd);
 760                 fd = -1;
 761                 return false;
 762         }
 763
 764         return true;
 765 }
 766
 767
 768 static int cmd_start(int argc, char *argv[]) {
 769         if(connect_tincd(false)) {
 770                 if(netname)
 771                         fprintf(stderr, "A tincd is already running for net `%s' with pid %d.\n", netname, pid);
 772                 else
 773                         fprintf(stderr, "A tincd is already running with pid %d.\n", pid);
 774                 return 0;
 775         }
 776
 777         char *c;
 778         char *slash = strrchr(program_name, '/');
 779
 780 #ifdef HAVE_MINGW
 781         if ((c = strrchr(program_name, '\\')) > slash)
 782                 slash = c;
 783 #endif
 784
 785         if (slash++)
 786                 xasprintf(&c, "%.*stincd", (int)(slash - program_name), program_name);
 787         else
 788                 c = "tincd";
 789
 790         int nargc = 0;
 791         char **nargv = xzalloc((optind + argc) * sizeof *nargv);
 792
 793         nargv[nargc++] = c;
 794         for(int i = 1; i < optind; i++)
 795                 nargv[nargc++] = orig_argv[i];
 796         for(int i = 1; i < argc; i++)
 797                 nargv[nargc++] = argv[i];
 798
 799 #ifdef HAVE_MINGW
 800         execvp(c, nargv);
 801         fprintf(stderr, "Error starting %s: %s\n", c, strerror(errno));
 802         return 1;
 803 #else
 804         pid_t pid = fork();
 805         if(pid == -1) {
 806                 fprintf(stderr, "Could not fork: %s\n", strerror(errno));
 807                 free(nargv);
 808                 return 1;
 809         }
 810
 811         if(!pid)
 812                 exit(execvp(c, nargv));
 813
 814         free(nargv);
 815
 816         int status = -1, result;
 817 #ifdef SIGINT
 818         signal(SIGINT, SIG_IGN);
 819 #endif
 820         result = waitpid(pid, &status, 0);
 821 #ifdef SIGINT
 822         signal(SIGINT, SIG_DFL);
 823 #endif
 824
 825         if(result != pid || !WIFEXITED(status) || WEXITSTATUS(status)) {
 826                 fprintf(stderr, "Error starting %s\n", c);
 827                 return 1;
 828         }
 829
 830         return 0;
 831 #endif
 832 }
 833
 834 static int cmd_stop(int argc, char *argv[]) {
 835         if(argc > 1) {
 836                 fprintf(stderr, "Too many arguments!\n");
 837                 return 1;
 838         }
 839
 840 #ifndef HAVE_MINGW
 841         if(!connect_tincd(true)) {
 842                 if(pid) {
 843                         if(kill(pid, SIGTERM)) {
 844                                 fprintf(stderr, "Could not send TERM signal to process with PID %u: %s\n", pid, strerror(errno));
 845                                 return 1;
 846                         }
 847
 848                         fprintf(stderr, "Sent TERM signal to process with PID %u.\n", pid);
 849                         waitpid(pid, NULL, 0);
 850                         return 0;
 851                 }
 852
 853                 return 1;
 854         }
 855
 856         sendline(fd, "%d %d", CONTROL, REQ_STOP);
 857
 858         while(recvline(fd, line, sizeof line)) {
 859                 // Wait for tincd to close the connection...
 860         }
 861 #else
 862         if(!remove_service())
 863                 return 1;
 864 #endif
 865         close(fd);
 866         pid = 0;
 867         fd = -1;
 868
 869         return 0;
 870 }
 871
 872 static int cmd_restart(int argc, char *argv[]) {
 873         cmd_stop(1, argv);
 874         return cmd_start(argc, argv);
 875 }
 876
 877 static int cmd_reload(int argc, char *argv[]) {
 878         if(argc > 1) {
 879                 fprintf(stderr, "Too many arguments!\n");
 880                 return 1;
 881         }
 882
 883         if(!connect_tincd(true))
 884                 return 1;
 885
 886         sendline(fd, "%d %d", CONTROL, REQ_RELOAD);
 887         if(!recvline(fd, line, sizeof line) || sscanf(line, "%d %d %d", &code, &req, &result) != 3 || code != CONTROL || req != REQ_RELOAD || result) {
 888                 fprintf(stderr, "Could not reload configuration.\n");
 889                 return 1;
 890         }
 891
 892         return 0;
 893
 894 }
 895
 896 static int cmd_dump(int argc, char *argv[]) {
 897         bool only_reachable = false;
 898
 899         if(argc > 2 && !strcasecmp(argv[1], "reachable")) {
 900                 if(strcasecmp(argv[2], "nodes")) {
 901                         fprintf(stderr, "`reachable' only supported for nodes.\n");
 902                         usage(true);
 903                         return 1;
 904                 }
 905                 only_reachable = true;
 906                 argv++;
 907                 argc--;
 908         }
 909
 910         if(argc != 2) {
 911                 fprintf(stderr, "Invalid number of arguments.\n");
 912                 usage(true);
 913                 return 1;
 914         }
 915
 916         if(!connect_tincd(true))
 917                 return 1;
 918
 919         int do_graph = 0;
 920
 921         if(!strcasecmp(argv[1], "nodes"))
 922                 sendline(fd, "%d %d", CONTROL, REQ_DUMP_NODES);
 923         else if(!strcasecmp(argv[1], "edges"))
 924                 sendline(fd, "%d %d", CONTROL, REQ_DUMP_EDGES);
 925         else if(!strcasecmp(argv[1], "subnets"))
 926                 sendline(fd, "%d %d", CONTROL, REQ_DUMP_SUBNETS);
 927         else if(!strcasecmp(argv[1], "connections"))
 928                 sendline(fd, "%d %d", CONTROL, REQ_DUMP_CONNECTIONS);
 929         else if(!strcasecmp(argv[1], "graph")) {
 930                 sendline(fd, "%d %d", CONTROL, REQ_DUMP_NODES);
 931                 sendline(fd, "%d %d", CONTROL, REQ_DUMP_EDGES);
 932                 do_graph = 1;
 933         } else if(!strcasecmp(argv[1], "digraph")) {
 934                 sendline(fd, "%d %d", CONTROL, REQ_DUMP_NODES);
 935                 sendline(fd, "%d %d", CONTROL, REQ_DUMP_EDGES);
 936                 do_graph = 2;
 937         } else {
 938                 fprintf(stderr, "Unknown dump type '%s'.\n", argv[1]);
 939                 usage(true);
 940                 return 1;
 941         }
 942
 943         if(do_graph == 1)
 944                 printf("graph {\n");
 945         else if(do_graph == 2)
 946                 printf("digraph {\n");
 947
 948         while(recvline(fd, line, sizeof line)) {
 949                 char node1[4096], node2[4096];
 950                 int n = sscanf(line, "%d %d %s %s", &code, &req, node1, node2);
 951                 if(n == 2) {
 952                         if(do_graph && req == REQ_DUMP_NODES)
 953                                 continue;
 954                         else {
 955                                 if(do_graph)
 956                                         printf("}\n");
 957                                 return 0;
 958                         }
 959                 }
 960                 if(n < 2)
 961                         break;
 962
 963                 char node[4096];
 964                 char from[4096];
 965                 char to[4096];
 966                 char subnet[4096];
 967                 char host[4096];
 968                 char port[4096];
 969                 char via[4096];
 970                 char nexthop[4096];
 971                 int cipher, digest, maclength, compression, distance, socket, weight;
 972                 short int pmtu, minmtu, maxmtu;
 973                 unsigned int options, status_int;
 974                 node_status_t status;
 975                 long int last_state_change;
 976
 977                 switch(req) {
 978                         case REQ_DUMP_NODES: {
 979                                 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);
 980                                 if(n != 16) {
 981                                         fprintf(stderr, "Unable to parse node dump from tincd: %s\n", line);
 982                                         return 1;
 983                                 }
 984
 985                                 memcpy(&status, &status_int, sizeof status);
 986
 987                                 if(do_graph) {
 988                                         const char *color = "black";
 989                                         if(!strcmp(host, "MYSELF"))
 990                                                 color = "green";
 991                                         else if(!status.reachable)
 992                                                 color = "red";
 993                                         else if(strcmp(via, node))
 994                                                 color = "orange";
 995                                         else if(!status.validkey)
 996                                                 color = "black";
 997                                         else if(minmtu > 0)
 998                                                 color = "green";
 999                                         printf(" %s [label = \"%s\", color = \"%s\"%s];\n", node, node, color, strcmp(host, "MYSELF") ? "" : ", style = \"filled\"");
1000                                 } else {
1001                                         if(only_reachable && !status.reachable)
1002                                                 continue;
1003                                         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",
1004                                                         node, host, port, cipher, digest, maclength, compression, options, status_int, nexthop, via, distance, pmtu, minmtu, maxmtu);
1005                                 }
1006                         } break;
1007
1008                         case REQ_DUMP_EDGES: {
1009                                 int n = sscanf(line, "%*d %*d %s %s %s port %s %x %d", from, to, host, port, &options, &weight);
1010                                 if(n != 6) {
1011                                         fprintf(stderr, "Unable to parse edge dump from tincd.\n");
1012                                         return 1;
1013                                 }
1014
1015                                 if(do_graph) {
1016                                         float w = 1 + 65536.0 / weight;
1017                                         if(do_graph == 1 && strcmp(node1, node2) > 0)
1018                                                 printf(" %s -- %s [w = %f, weight = %f];\n", node1, node2, w, w);
1019                                         else if(do_graph == 2)
1020                                                 printf(" %s -> %s [w = %f, weight = %f];\n", node1, node2, w, w);
1021                                 } else {
1022                                         printf("%s to %s at %s port %s options %x weight %d\n", from, to, host, port, options, weight);
1023                                 }
1024                         } break;
1025
1026                         case REQ_DUMP_SUBNETS: {
1027                                 int n = sscanf(line, "%*d %*d %s %s", subnet, node);
1028                                 if(n != 2) {
1029                                         fprintf(stderr, "Unable to parse subnet dump from tincd.\n");
1030                                         return 1;
1031                                 }
1032                                 printf("%s owner %s\n", strip_weight(subnet), node);
1033                         } break;
1034
1035                         case REQ_DUMP_CONNECTIONS: {
1036                                 int n = sscanf(line, "%*d %*d %s %s port %s %x %d %x", node, host, port, &options, &socket, &status_int);
1037                                 if(n != 6) {
1038                                         fprintf(stderr, "Unable to parse connection dump from tincd.\n");
1039                                         return 1;
1040                                 }
1041                                 printf("%s at %s port %s options %x socket %d status %x\n", node, host, port, options, socket, status_int);
1042                         } break;
1043
1044                         default:
1045                                 fprintf(stderr, "Unable to parse dump from tincd.\n");
1046                                 return 1;
1047                 }
1048         }
1049
1050         fprintf(stderr, "Error receiving dump.\n");
1051         return 1;
1052 }
1053
1054 static int cmd_purge(int argc, char *argv[]) {
1055         if(argc > 1) {
1056                 fprintf(stderr, "Too many arguments!\n");
1057                 return 1;
1058         }
1059
1060         if(!connect_tincd(true))
1061                 return 1;
1062
1063         sendline(fd, "%d %d", CONTROL, REQ_PURGE);
1064         if(!recvline(fd, line, sizeof line) || sscanf(line, "%d %d %d", &code, &req, &result) != 3 || code != CONTROL || req != REQ_PURGE || result) {
1065                 fprintf(stderr, "Could not purge old information.\n");
1066                 return 1;
1067         }
1068
1069         return 0;
1070 }
1071
1072 static int cmd_debug(int argc, char *argv[]) {
1073         if(argc != 2) {
1074                 fprintf(stderr, "Invalid number of arguments.\n");
1075                 return 1;
1076         }
1077
1078         if(!connect_tincd(true))
1079                 return 1;
1080
1081         int debuglevel = atoi(argv[1]);
1082         int origlevel;
1083
1084         sendline(fd, "%d %d %d", CONTROL, REQ_SET_DEBUG, debuglevel);
1085         if(!recvline(fd, line, sizeof line) || sscanf(line, "%d %d %d", &code, &req, &origlevel) != 3 || code != CONTROL || req != REQ_SET_DEBUG) {
1086                 fprintf(stderr, "Could not set debug level.\n");
1087                 return 1;
1088         }
1089
1090         fprintf(stderr, "Old level %d, new level %d.\n", origlevel, debuglevel);
1091         return 0;
1092 }
1093
1094 static int cmd_retry(int argc, char *argv[]) {
1095         if(argc > 1) {
1096                 fprintf(stderr, "Too many arguments!\n");
1097                 return 1;
1098         }
1099
1100         if(!connect_tincd(true))
1101                 return 1;
1102
1103         sendline(fd, "%d %d", CONTROL, REQ_RETRY);
1104         if(!recvline(fd, line, sizeof line) || sscanf(line, "%d %d %d", &code, &req, &result) != 3 || code != CONTROL || req != REQ_RETRY || result) {
1105                 fprintf(stderr, "Could not retry outgoing connections.\n");
1106                 return 1;
1107         }
1108
1109         return 0;
1110 }
1111
1112 static int cmd_connect(int argc, char *argv[]) {
1113         if(argc != 2) {
1114                 fprintf(stderr, "Invalid number of arguments.\n");
1115                 return 1;
1116         }
1117
1118         if(!check_id(argv[1])) {
1119                 fprintf(stderr, "Invalid name for node.\n");
1120                 return 1;
1121         }
1122
1123         if(!connect_tincd(true))
1124                 return 1;
1125
1126         sendline(fd, "%d %d %s", CONTROL, REQ_CONNECT, argv[1]);
1127         if(!recvline(fd, line, sizeof line) || sscanf(line, "%d %d %d", &code, &req, &result) != 3 || code != CONTROL || req != REQ_CONNECT || result) {
1128                 fprintf(stderr, "Could not connect to %s.\n", argv[1]);
1129                 return 1;
1130         }
1131
1132         return 0;
1133 }
1134
1135 static int cmd_disconnect(int argc, char *argv[]) {
1136         if(argc != 2) {
1137                 fprintf(stderr, "Invalid number of arguments.\n");
1138                 return 1;
1139         }
1140
1141         if(!check_id(argv[1])) {
1142                 fprintf(stderr, "Invalid name for node.\n");
1143                 return 1;
1144         }
1145
1146         if(!connect_tincd(true))
1147                 return 1;
1148
1149         sendline(fd, "%d %d %s", CONTROL, REQ_DISCONNECT, argv[1]);
1150         if(!recvline(fd, line, sizeof line) || sscanf(line, "%d %d %d", &code, &req, &result) != 3 || code != CONTROL || req != REQ_DISCONNECT || result) {
1151                 fprintf(stderr, "Could not disconnect %s.\n", argv[1]);
1152                 return 1;
1153         }
1154
1155         return 0;
1156 }
1157
1158 static int cmd_top(int argc, char *argv[]) {
1159         if(argc > 1) {
1160                 fprintf(stderr, "Too many arguments!\n");
1161                 return 1;
1162         }
1163
1164 #ifdef HAVE_CURSES
1165         if(!connect_tincd(true))
1166                 return 1;
1167
1168         top(fd);
1169         return 0;
1170 #else
1171         fprintf(stderr, "This version of tinc was compiled without support for the curses library.\n");
1172         return 1;
1173 #endif
1174 }
1175
1176 static int cmd_pcap(int argc, char *argv[]) {
1177         if(argc > 2) {
1178                 fprintf(stderr, "Too many arguments!\n");
1179                 return 1;
1180         }
1181
1182         if(!connect_tincd(true))
1183                 return 1;
1184
1185         pcap(fd, stdout, argc > 1 ? atoi(argv[1]) : 0);
1186         return 0;
1187 }
1188
1189 #ifdef SIGINT
1190 static void sigint_handler(int sig) {
1191         fprintf(stderr, "\n");
1192         shutdown(fd, SHUT_RDWR);
1193 }
1194 #endif
1195
1196 static int cmd_log(int argc, char *argv[]) {
1197         if(argc > 2) {
1198                 fprintf(stderr, "Too many arguments!\n");
1199                 return 1;
1200         }
1201
1202         if(!connect_tincd(true))
1203                 return 1;
1204
1205 #ifdef SIGINT
1206         signal(SIGINT, sigint_handler);
1207 #endif
1208
1209         logcontrol(fd, stdout, argc > 1 ? atoi(argv[1]) : -1);
1210
1211 #ifdef SIGINT
1212         signal(SIGINT, SIG_DFL);
1213 #endif
1214
1215         close(fd);
1216         fd = -1;
1217         return 0;
1218 }
1219
1220 static int cmd_pid(int argc, char *argv[]) {
1221         if(argc > 1) {
1222                 fprintf(stderr, "Too many arguments!\n");
1223                 return 1;
1224         }
1225
1226         if(!connect_tincd(true) && !pid)
1227                 return 1;
1228
1229         printf("%d\n", pid);
1230         return 0;
1231 }
1232
1233 int rstrip(char *value) {
1234         int len = strlen(value);
1235         while(len && strchr("\t\r\n ", value[len - 1]))
1236                 value[--len] = 0;
1237         return len;
1238 }
1239
1240 char *get_my_name(bool verbose) {
1241         FILE *f = fopen(tinc_conf, "r");
1242         if(!f) {
1243                 if(verbose)
1244                         fprintf(stderr, "Could not open %s: %s\n", tinc_conf, strerror(errno));
1245                 return NULL;
1246         }
1247
1248         char buf[4096];
1249         char *value;
1250         while(fgets(buf, sizeof buf, f)) {
1251                 int len = strcspn(buf, "\t =");
1252                 value = buf + len;
1253                 value += strspn(value, "\t ");
1254                 if(*value == '=') {
1255                         value++;
1256                         value += strspn(value, "\t ");
1257                 }
1258                 if(!rstrip(value))
1259                         continue;
1260                 buf[len] = 0;
1261                 if(strcasecmp(buf, "Name"))
1262                         continue;
1263                 if(*value) {
1264                         fclose(f);
1265                         return strdup(value);
1266                 }
1267         }
1268
1269         fclose(f);
1270         if(verbose)
1271                 fprintf(stderr, "Could not find Name in %s.\n", tinc_conf);
1272         return NULL;
1273 }
1274
1275 const var_t variables[] = {
1276         /* Server configuration */
1277         {"AddressFamily", VAR_SERVER},
1278         {"AutoConnect", VAR_SERVER | VAR_SAFE},
1279         {"BindToAddress", VAR_SERVER | VAR_MULTIPLE},
1280         {"BindToInterface", VAR_SERVER},
1281         {"Broadcast", VAR_SERVER | VAR_SAFE},
1282         {"ConnectTo", VAR_SERVER | VAR_MULTIPLE | VAR_SAFE},
1283         {"DecrementTTL", VAR_SERVER},
1284         {"Device", VAR_SERVER},
1285         {"DeviceType", VAR_SERVER},
1286         {"DirectOnly", VAR_SERVER},
1287         {"ECDSAPrivateKeyFile", VAR_SERVER},
1288         {"ExperimentalProtocol", VAR_SERVER},
1289         {"Forwarding", VAR_SERVER},
1290         {"GraphDumpFile", VAR_SERVER | VAR_OBSOLETE},
1291         {"Hostnames", VAR_SERVER},
1292         {"IffOneQueue", VAR_SERVER},
1293         {"Interface", VAR_SERVER},
1294         {"KeyExpire", VAR_SERVER},
1295         {"LocalDiscovery", VAR_SERVER},
1296         {"MACExpire", VAR_SERVER},
1297         {"MaxConnectionBurst", VAR_SERVER},
1298         {"MaxOutputBufferSize", VAR_SERVER},
1299         {"MaxTimeout", VAR_SERVER},
1300         {"Mode", VAR_SERVER | VAR_SAFE},
1301         {"Name", VAR_SERVER},
1302         {"PingInterval", VAR_SERVER},
1303         {"PingTimeout", VAR_SERVER},
1304         {"PriorityInheritance", VAR_SERVER},
1305         {"PrivateKey", VAR_SERVER | VAR_OBSOLETE},
1306         {"PrivateKeyFile", VAR_SERVER},
1307         {"ProcessPriority", VAR_SERVER},
1308         {"Proxy", VAR_SERVER},
1309         {"ReplayWindow", VAR_SERVER},
1310         {"ScriptsExtension", VAR_SERVER},
1311         {"ScriptsInterpreter", VAR_SERVER},
1312         {"StrictSubnets", VAR_SERVER},
1313         {"TunnelServer", VAR_SERVER},
1314         {"UDPRcvBuf", VAR_SERVER},
1315         {"UDPSndBuf", VAR_SERVER},
1316         {"VDEGroup", VAR_SERVER},
1317         {"VDEPort", VAR_SERVER},
1318         /* Host configuration */
1319         {"Address", VAR_HOST | VAR_MULTIPLE},
1320         {"Cipher", VAR_SERVER | VAR_HOST},
1321         {"ClampMSS", VAR_SERVER | VAR_HOST},
1322         {"Compression", VAR_SERVER | VAR_HOST},
1323         {"Digest", VAR_SERVER | VAR_HOST},
1324         {"ECDSAPublicKey", VAR_HOST},
1325         {"ECDSAPublicKeyFile", VAR_SERVER | VAR_HOST},
1326         {"IndirectData", VAR_SERVER | VAR_HOST},
1327         {"MACLength", VAR_SERVER | VAR_HOST},
1328         {"PMTU", VAR_SERVER | VAR_HOST},
1329         {"PMTUDiscovery", VAR_SERVER | VAR_HOST},
1330         {"Port", VAR_HOST},
1331         {"PublicKey", VAR_HOST | VAR_OBSOLETE},
1332         {"PublicKeyFile", VAR_SERVER | VAR_HOST | VAR_OBSOLETE},
1333         {"Subnet", VAR_HOST | VAR_MULTIPLE | VAR_SAFE},
1334         {"TCPOnly", VAR_SERVER | VAR_HOST},
1335         {"Weight", VAR_HOST | VAR_SAFE},
1336         {NULL, 0}
1337 };
1338
1339 static int cmd_config(int argc, char *argv[]) {
1340         if(argc < 2) {
1341                 fprintf(stderr, "Invalid number of arguments.\n");
1342                 return 1;
1343         }
1344
1345         if(strcasecmp(argv[0], "config"))
1346                 argv--, argc++;
1347
1348         int action = -2;
1349         if(!strcasecmp(argv[1], "get")) {
1350                 argv++, argc--;
1351         } else if(!strcasecmp(argv[1], "add")) {
1352                 argv++, argc--, action = 1;
1353         } else if(!strcasecmp(argv[1], "del")) {
1354                 argv++, argc--, action = -1;
1355         } else if(!strcasecmp(argv[1], "replace") || !strcasecmp(argv[1], "set") || !strcasecmp(argv[1], "change")) {
1356                 argv++, argc--, action = 0;
1357         }
1358
1359         if(argc < 2) {
1360                 fprintf(stderr, "Invalid number of arguments.\n");
1361                 return 1;
1362         }
1363
1364         // Concatenate the rest of the command line
1365         strncpy(line, argv[1], sizeof line - 1);
1366         for(int i = 2; i < argc; i++) {
1367                 strncat(line, " ", sizeof line - 1 - strlen(line));
1368                 strncat(line, argv[i], sizeof line - 1 - strlen(line));
1369         }
1370
1371         // Liberal parsing into node name, variable name and value.
1372         char *node = NULL;
1373         char *variable;
1374         char *value;
1375         int len;
1376
1377         len = strcspn(line, "\t =");
1378         value = line + len;
1379         value += strspn(value, "\t ");
1380         if(*value == '=') {
1381                 value++;
1382                 value += strspn(value, "\t ");
1383         }
1384         line[len] = '\0';
1385         variable = strchr(line, '.');
1386         if(variable) {
1387                 node = line;
1388                 *variable++ = 0;
1389         } else {
1390                 variable = line;
1391         }
1392
1393         if(!*variable) {
1394                 fprintf(stderr, "No variable given.\n");
1395                 return 1;
1396         }
1397
1398         if(action >= 0 && !*value) {
1399                 fprintf(stderr, "No value for variable given.\n");
1400                 return 1;
1401         }
1402
1403         if(action < -1 && *value)
1404                 action = 0;
1405
1406         /* Some simple checks. */
1407         bool found = false;
1408         bool warnonremove = false;
1409
1410         for(int i = 0; variables[i].name; i++) {
1411                 if(strcasecmp(variables[i].name, variable))
1412                         continue;
1413
1414                 found = true;
1415                 variable = (char *)variables[i].name;
1416
1417                 /* Discourage use of obsolete variables. */
1418
1419                 if(variables[i].type & VAR_OBSOLETE && action >= 0) {
1420                         if(force) {
1421                                 fprintf(stderr, "Warning: %s is an obsolete variable!\n", variable);
1422                         } else {
1423                                 fprintf(stderr, "%s is an obsolete variable! Use --force to use it anyway.\n", variable);
1424                                 return 1;
1425                         }
1426                 }
1427
1428                 /* Don't put server variables in host config files */
1429
1430                 if(node && !(variables[i].type & VAR_HOST) && action >= 0) {
1431                         if(force) {
1432                                 fprintf(stderr, "Warning: %s is not a host configuration variable!\n", variable);
1433                         } else {
1434                                 fprintf(stderr, "%s is not a host configuration variable! Use --force to use it anyway.\n", variable);
1435                                 return 1;
1436                         }
1437                 }
1438
1439                 /* Should this go into our own host config file? */
1440
1441                 if(!node && !(variables[i].type & VAR_SERVER)) {
1442                         node = get_my_name(true);
1443                         if(!node)
1444                                 return 1;
1445                 }
1446
1447                 /* Change "add" into "set" for variables that do not allow multiple occurences.
1448                    Turn on warnings when it seems variables might be removed unintentionally. */
1449
1450                 if(action == 1 && !(variables[i].type & VAR_MULTIPLE)) {
1451                         warnonremove = true;
1452                         action = 0;
1453                 } else if(action == 0 && (variables[i].type & VAR_MULTIPLE)) {
1454                         warnonremove = true;
1455                 }
1456
1457                 break;
1458         }
1459
1460         if(node && !check_id(node)) {
1461                 fprintf(stderr, "Invalid name for node.\n");
1462                 return 1;
1463         }
1464
1465         if(!found) {
1466                 if(force || action < 0) {
1467                         fprintf(stderr, "Warning: %s is not a known configuration variable!\n", variable);
1468                 } else {
1469                         fprintf(stderr, "%s: is not a known configuration variable! Use --force to use it anyway.\n", variable);
1470                         return 1;
1471                 }
1472         }
1473
1474         // Open the right configuration file.
1475         char *filename;
1476         if(node)
1477                 xasprintf(&filename, "%s" SLASH "%s", hosts_dir, node);
1478         else
1479                 filename = tinc_conf;
1480
1481         FILE *f = fopen(filename, "r");
1482         if(!f) {
1483                 fprintf(stderr, "Could not open configuration file %s: %s\n", filename, strerror(errno));
1484                 return 1;
1485         }
1486
1487         char *tmpfile = NULL;
1488         FILE *tf = NULL;
1489
1490         if(action >= -1) {
1491                 xasprintf(&tmpfile, "%s.config.tmp", filename);
1492                 tf = fopen(tmpfile, "w");
1493                 if(!tf) {
1494                         fprintf(stderr, "Could not open temporary file %s: %s\n", tmpfile, strerror(errno));
1495                         fclose(f);
1496                         return 1;
1497                 }
1498         }
1499
1500         // Copy the file, making modifications on the fly, unless we are just getting a value.
1501         char buf1[4096];
1502         char buf2[4096];
1503         bool set = false;
1504         bool removed = false;
1505         found = false;
1506
1507         while(fgets(buf1, sizeof buf1, f)) {
1508                 buf1[sizeof buf1 - 1] = 0;
1509                 strncpy(buf2, buf1, sizeof buf2);
1510
1511                 // Parse line in a simple way
1512                 char *bvalue;
1513                 int len;
1514
1515                 len = strcspn(buf2, "\t =");
1516                 bvalue = buf2 + len;
1517                 bvalue += strspn(bvalue, "\t ");
1518                 if(*bvalue == '=') {
1519                         bvalue++;
1520                         bvalue += strspn(bvalue, "\t ");
1521                 }
1522                 rstrip(bvalue);
1523                 buf2[len] = '\0';
1524
1525                 // Did it match?
1526                 if(!strcasecmp(buf2, variable)) {
1527                         // Get
1528                         if(action < -1) {
1529                                 found = true;
1530                                 printf("%s\n", bvalue);
1531                         // Del
1532                         } else if(action == -1) {
1533                                 if(!*value || !strcasecmp(bvalue, value)) {
1534                                         removed = true;
1535                                         continue;
1536                                 }
1537                         // Set
1538                         } else if(action == 0) {
1539                                 // Warn if "set" was used for variables that can occur multiple times
1540                                 if(warnonremove && strcasecmp(bvalue, value))
1541                                         fprintf(stderr, "Warning: removing %s = %s\n", variable, bvalue);
1542
1543                                 // Already set? Delete the rest...
1544                                 if(set)
1545                                         continue;
1546
1547                                 // Otherwise, replace.
1548                                 if(fprintf(tf, "%s = %s\n", variable, value) < 0) {
1549                                         fprintf(stderr, "Error writing to temporary file %s: %s\n", tmpfile, strerror(errno));
1550                                         return 1;
1551                                 }
1552                                 set = true;
1553                                 continue;
1554                         }
1555                 }
1556
1557                 if(action >= -1) {
1558                         // Copy original line...
1559                         if(fputs(buf1, tf) < 0) {
1560                                 fprintf(stderr, "Error writing to temporary file %s: %s\n", tmpfile, strerror(errno));
1561                                 return 1;
1562                         }
1563
1564                         // Add newline if it is missing...
1565                         if(*buf1 && buf1[strlen(buf1) - 1] != '\n') {
1566                                 if(fputc('\n', tf) < 0) {
1567                                         fprintf(stderr, "Error writing to temporary file %s: %s\n", tmpfile, strerror(errno));
1568                                         return 1;
1569                                 }
1570                         }
1571                 }
1572         }
1573
1574         // Make sure we read everything...
1575         if(ferror(f) || !feof(f)) {
1576                 fprintf(stderr, "Error while reading from configuration file %s: %s\n", filename, strerror(errno));
1577                 return 1;
1578         }
1579
1580         if(fclose(f)) {
1581                 fprintf(stderr, "Error closing configuration file %s: %s\n", filename, strerror(errno));
1582                 return 1;
1583         }
1584
1585         // Add new variable if necessary.
1586         if(action > 0 || (action == 0 && !set)) {
1587                 if(fprintf(tf, "%s = %s\n", variable, value) < 0) {
1588                         fprintf(stderr, "Error writing to temporary file %s: %s\n", tmpfile, strerror(errno));
1589                         return 1;
1590                 }
1591         }
1592
1593         if(action < -1) {
1594                 if(!found)
1595                         fprintf(stderr, "No matching configuration variables found.\n");
1596                 return 0;
1597         }
1598
1599         // Make sure we wrote everything...
1600         if(fclose(tf)) {
1601                 fprintf(stderr, "Error closing temporary file %s: %s\n", tmpfile, strerror(errno));
1602                 return 1;
1603         }
1604
1605         // Could we find what we had to remove?
1606         if(action < 0 && !removed) {
1607                 remove(tmpfile);
1608                 fprintf(stderr, "No configuration variables deleted.\n");
1609                 return *value != 0;
1610         }
1611
1612         // Replace the configuration file with the new one
1613 #ifdef HAVE_MINGW
1614         if(remove(filename)) {
1615                 fprintf(stderr, "Error replacing file %s: %s\n", filename, strerror(errno));
1616                 return 1;
1617         }
1618 #endif
1619         if(rename(tmpfile, filename)) {
1620                 fprintf(stderr, "Error renaming temporary file %s to configuration file %s: %s\n", tmpfile, filename, strerror(errno));
1621                 return 1;
1622         }
1623
1624         // Silently try notifying a running tincd of changes.
1625         if(connect_tincd(false))
1626                 sendline(fd, "%d %d", CONTROL, REQ_RELOAD);
1627
1628         return 0;
1629 }
1630
1631 bool check_id(const char *name) {
1632         if(!name || !*name)
1633                 return false;
1634
1635         for(int i = 0; i < strlen(name); i++) {
1636                 if(!isalnum(name[i]) && name[i] != '_')
1637                         return false;
1638         }
1639
1640         return true;
1641 }
1642
1643 static bool try_bind(int port) {
1644         struct addrinfo *ai = NULL;
1645         struct addrinfo hint = {
1646                 .ai_flags = AI_PASSIVE,
1647                 .ai_family = AF_UNSPEC,
1648                 .ai_socktype = SOCK_STREAM,
1649                 .ai_protocol = IPPROTO_TCP,
1650         };
1651
1652         char portstr[16];
1653         snprintf(portstr, sizeof portstr, "%d", port);
1654
1655         if(getaddrinfo(NULL, portstr, &hint, &ai) || !ai)
1656                 return false;
1657
1658         while(ai) {
1659                 int fd = socket(ai->ai_family, SOCK_STREAM, IPPROTO_TCP);
1660                 if(!fd)
1661                         return false;
1662                 int result = bind(fd, ai->ai_addr, ai->ai_addrlen);
1663                 closesocket(fd);
1664                 if(result)
1665                         return false;
1666                 ai = ai->ai_next;
1667         }
1668
1669         return true;
1670 }
1671
1672 int check_port(char *name) {
1673         if(try_bind(655))
1674                 return 655;
1675
1676         fprintf(stderr, "Warning: could not bind to port 655. ");
1677
1678         for(int i = 0; i < 100; i++) {
1679                 int port = 0x1000 + (rand() & 0x7fff);
1680                 if(try_bind(port)) {
1681                         char *filename;
1682                         xasprintf(&filename, "%s" SLASH "hosts" SLASH "%s", confbase, name);
1683                         FILE *f = fopen(filename, "a");
1684                         free(filename);
1685                         if(!f) {
1686                                 fprintf(stderr, "Please change tinc's Port manually.\n");
1687                                 return 0;
1688                         }
1689
1690                         fprintf(f, "Port = %d\n", port);
1691                         fclose(f);
1692                         fprintf(stderr, "Tinc will instead listen on port %d.\n", port);
1693                         return port;
1694                 }
1695         }
1696
1697         fprintf(stderr, "Please change tinc's Port manually.\n");
1698         return 0;
1699 }
1700
1701 static int cmd_init(int argc, char *argv[]) {
1702         if(!access(tinc_conf, F_OK)) {
1703                 fprintf(stderr, "Configuration file %s already exists!\n", tinc_conf);
1704                 return 1;
1705         }
1706
1707         if(argc > 2) {
1708                 fprintf(stderr, "Too many arguments!\n");
1709                 return 1;
1710         } else if(argc < 2) {
1711                 if(tty) {
1712                         char buf[1024];
1713                         fprintf(stdout, "Enter the Name you want your tinc node to have: ");
1714                         fflush(stdout);
1715                         if(!fgets(buf, sizeof buf, stdin)) {
1716                                 fprintf(stderr, "Error while reading stdin: %s\n", strerror(errno));
1717                                 return 1;
1718                         }
1719                         int len = rstrip(buf);
1720                         if(!len) {
1721                                 fprintf(stderr, "No name given!\n");
1722                                 return 1;
1723                         }
1724                         name = strdup(buf);
1725                 } else {
1726                         fprintf(stderr, "No Name given!\n");
1727                         return 1;
1728                 }
1729         } else {
1730                 name = strdup(argv[1]);
1731                 if(!*name) {
1732                         fprintf(stderr, "No Name given!\n");
1733                         return 1;
1734                 }
1735         }
1736
1737         if(!check_id(name)) {
1738                 fprintf(stderr, "Invalid Name! Only a-z, A-Z, 0-9 and _ are allowed characters.\n");
1739                 return 1;
1740         }
1741
1742         if(!confbase_given && mkdir(confdir, 0755) && errno != EEXIST) {
1743                 fprintf(stderr, "Could not create directory %s: %s\n", confdir, strerror(errno));
1744                 return 1;
1745         }
1746
1747         if(mkdir(confbase, 0777) && errno != EEXIST) {
1748                 fprintf(stderr, "Could not create directory %s: %s\n", confbase, strerror(errno));
1749                 return 1;
1750         }
1751
1752         if(mkdir(hosts_dir, 0777) && errno != EEXIST) {
1753                 fprintf(stderr, "Could not create directory %s: %s\n", hosts_dir, strerror(errno));
1754                 return 1;
1755         }
1756
1757         FILE *f = fopen(tinc_conf, "w");
1758         if(!f) {
1759                 fprintf(stderr, "Could not create file %s: %s\n", tinc_conf, strerror(errno));
1760                 return 1;
1761         }
1762
1763         fprintf(f, "Name = %s\n", name);
1764         fclose(f);
1765
1766         if(!rsa_keygen(2048, false) || !ecdsa_keygen(false))
1767                 return 1;
1768
1769         check_port(name);
1770
1771 #ifndef HAVE_MINGW
1772         char *filename;
1773         xasprintf(&filename, "%s" SLASH "tinc-up", confbase);
1774         if(access(filename, F_OK)) {
1775                 FILE *f = fopenmask(filename, "w", 0777);
1776                 if(!f) {
1777                         fprintf(stderr, "Could not create file %s: %s\n", filename, strerror(errno));
1778                         return 1;
1779                 }
1780                 fprintf(f, "#!/bin/sh\n\necho 'Unconfigured tinc-up script, please edit '$0'!'\n\n#ifconfig $INTERFACE <your vpn IP address> netmask <netmask of whole VPN>\n");
1781                 fclose(f);
1782         }
1783 #endif
1784
1785         return 0;
1786
1787 }
1788
1789 static int cmd_generate_keys(int argc, char *argv[]) {
1790         if(argc > 2) {
1791                 fprintf(stderr, "Too many arguments!\n");
1792                 return 1;
1793         }
1794
1795         if(!name)
1796                 name = get_my_name(false);
1797
1798         return !(rsa_keygen(argc > 1 ? atoi(argv[1]) : 2048, true) && ecdsa_keygen(true));
1799 }
1800
1801 static int cmd_generate_rsa_keys(int argc, char *argv[]) {
1802         if(argc > 2) {
1803                 fprintf(stderr, "Too many arguments!\n");
1804                 return 1;
1805         }
1806
1807         if(!name)
1808                 name = get_my_name(false);
1809
1810         return !rsa_keygen(argc > 1 ? atoi(argv[1]) : 2048, true);
1811 }
1812
1813 static int cmd_generate_ecdsa_keys(int argc, char *argv[]) {
1814         if(argc > 1) {
1815                 fprintf(stderr, "Too many arguments!\n");
1816                 return 1;
1817         }
1818
1819         if(!name)
1820                 name = get_my_name(false);
1821
1822         return !ecdsa_keygen(true);
1823 }
1824
1825 static int cmd_help(int argc, char *argv[]) {
1826         usage(false);
1827         return 0;
1828 }
1829
1830 static int cmd_version(int argc, char *argv[]) {
1831         if(argc > 1) {
1832                 fprintf(stderr, "Too many arguments!\n");
1833                 return 1;
1834         }
1835
1836         version();
1837         return 0;
1838 }
1839
1840 static int cmd_info(int argc, char *argv[]) {
1841         if(argc != 2) {
1842                 fprintf(stderr, "Invalid number of arguments.\n");
1843                 return 1;
1844         }
1845
1846         if(!connect_tincd(true))
1847                 return 1;
1848
1849         return info(fd, argv[1]);
1850 }
1851
1852 static const char *conffiles[] = {
1853         "tinc.conf",
1854         "tinc-up",
1855         "tinc-down",
1856         "subnet-up",
1857         "subnet-down",
1858         "host-up",
1859         "host-down",
1860         NULL,
1861 };
1862
1863 static int cmd_edit(int argc, char *argv[]) {
1864         if(argc != 2) {
1865                 fprintf(stderr, "Invalid number of arguments.\n");
1866                 return 1;
1867         }
1868
1869         char *filename = NULL;
1870
1871         if(strncmp(argv[1], "hosts" SLASH, 6)) {
1872                 for(int i = 0; conffiles[i]; i++) {
1873                         if(!strcmp(argv[1], conffiles[i])) {
1874                                 xasprintf(&filename, "%s" SLASH "%s", confbase, argv[1]);
1875                                 break;
1876                         }
1877                 }
1878         } else {
1879                 argv[1] += 6;
1880         }
1881
1882         if(!filename) {
1883                 xasprintf(&filename, "%s" SLASH "%s", hosts_dir, argv[1]);
1884                 char *dash = strchr(argv[1], '-');
1885                 if(dash) {
1886                         *dash++ = 0;
1887                         if((strcmp(dash, "up") && strcmp(dash, "down")) || !check_id(argv[1])) {
1888                                 fprintf(stderr, "Invalid configuration filename.\n");
1889                                 return 1;
1890                         }
1891                 }
1892         }
1893
1894         char *command;
1895 #ifndef HAVE_MINGW
1896         xasprintf(&command, "\"%s\" \"%s\"", getenv("VISUAL") ?: getenv("EDITOR") ?: "vi", filename);
1897 #else
1898         xasprintf(&command, "edit \"%s\"", filename);
1899 #endif
1900         int result = system(command);
1901         if(result)
1902                 return result;
1903
1904         // Silently try notifying a running tincd of changes.
1905         if(connect_tincd(false))
1906                 sendline(fd, "%d %d", CONTROL, REQ_RELOAD);
1907
1908         return 0;
1909 }
1910
1911 static int export(const char *name, FILE *out) {
1912         char *filename;
1913         xasprintf(&filename, "%s" SLASH "%s", hosts_dir, name);
1914         FILE *in = fopen(filename, "r");
1915         if(!in) {
1916                 fprintf(stderr, "Could not open configuration file %s: %s\n", filename, strerror(errno));
1917                 return 1;
1918         }
1919
1920         fprintf(out, "Name = %s\n", name);
1921         char buf[4096];
1922         while(fgets(buf, sizeof buf, in)) {
1923                 if(strcspn(buf, "\t =") != 4 || strncasecmp(buf, "Name", 4))
1924                         fputs(buf, out);
1925         }
1926
1927         if(ferror(in)) {
1928                 fprintf(stderr, "Error while reading configuration file %s: %s\n", filename, strerror(errno));
1929                 fclose(in);
1930                 return 1;
1931         }
1932
1933         fclose(in);
1934         return 0;
1935 }
1936
1937 static int cmd_export(int argc, char *argv[]) {
1938         if(argc > 1) {
1939                 fprintf(stderr, "Too many arguments!\n");
1940                 return 1;
1941         }
1942
1943         char *name = get_my_name(true);
1944         if(!name)
1945                 return 1;
1946
1947         int result = export(name, stdout);
1948         if(!tty)
1949                 fclose(stdout);
1950
1951         free(name);
1952         return result;
1953 }
1954
1955 static int cmd_export_all(int argc, char *argv[]) {
1956         if(argc > 1) {
1957                 fprintf(stderr, "Too many arguments!\n");
1958                 return 1;
1959         }
1960
1961         DIR *dir = opendir(hosts_dir);
1962         if(!dir) {
1963                 fprintf(stderr, "Could not open host configuration directory %s: %s\n", hosts_dir, strerror(errno));
1964                 return 1;
1965         }
1966
1967         bool first = true;
1968         int result = 0;
1969         struct dirent *ent;
1970
1971         while((ent = readdir(dir))) {
1972                 if(!check_id(ent->d_name))
1973                         continue;
1974
1975                 if(first)
1976                         first = false;
1977                 else
1978                         printf("#---------------------------------------------------------------#\n");
1979
1980                 result |= export(ent->d_name, stdout);
1981         }
1982
1983         closedir(dir);
1984         if(!tty)
1985                 fclose(stdout);
1986         return result;
1987 }
1988
1989 static int cmd_import(int argc, char *argv[]) {
1990         if(argc > 1) {
1991                 fprintf(stderr, "Too many arguments!\n");
1992                 return 1;
1993         }
1994
1995         FILE *in = stdin;
1996         FILE *out = NULL;
1997
1998         char buf[4096];
1999         char name[4096];
2000         char *filename = NULL;
2001         int count = 0;
2002         bool firstline = true;
2003
2004         while(fgets(buf, sizeof buf, in)) {
2005                 if(sscanf(buf, "Name = %s", name) == 1) {
2006                         firstline = false;
2007
2008                         if(!check_id(name)) {
2009                                 fprintf(stderr, "Invalid Name in input!\n");
2010                                 return 1;
2011                         }
2012
2013                         if(out)
2014                                 fclose(out);
2015
2016                         free(filename);
2017                         xasprintf(&filename, "%s" SLASH "%s", hosts_dir, name);
2018
2019                         if(!force && !access(filename, F_OK)) {
2020                                 fprintf(stderr, "Host configuration file %s already exists, skipping.\n", filename);
2021                                 out = NULL;
2022                                 continue;
2023                         }
2024
2025                         out = fopen(filename, "w");
2026                         if(!out) {
2027                                 fprintf(stderr, "Error creating configuration file %s: %s\n", filename, strerror(errno));
2028                                 return 1;
2029                         }
2030
2031                         count++;
2032                         continue;
2033                 } else if(firstline) {
2034                         fprintf(stderr, "Junk at the beginning of the input, ignoring.\n");
2035                         firstline = false;
2036                 }
2037
2038
2039                 if(!strcmp(buf, "#---------------------------------------------------------------#\n"))
2040                         continue;
2041
2042                 if(out) {
2043                         if(fputs(buf, out) < 0) {
2044                                 fprintf(stderr, "Error writing to host configuration file %s: %s\n", filename, strerror(errno));
2045                                 return 1;
2046                         }
2047                 }
2048         }
2049
2050         if(out)
2051                 fclose(out);
2052
2053         if(count) {
2054                 fprintf(stderr, "Imported %d host configuration files.\n", count);
2055                 return 0;
2056         } else {
2057                 fprintf(stderr, "No host configuration files imported.\n");
2058                 return 1;
2059         }
2060 }
2061
2062 static int cmd_exchange(int argc, char *argv[]) {
2063         return cmd_export(argc, argv) ?: cmd_import(argc, argv);
2064 }
2065
2066 static int cmd_exchange_all(int argc, char *argv[]) {
2067         return cmd_export_all(argc, argv) ?: cmd_import(argc, argv);
2068 }
2069
2070 static const struct {
2071         const char *command;
2072         int (*function)(int argc, char *argv[]);
2073         bool hidden;
2074 } commands[] = {
2075         {"start", cmd_start},
2076         {"stop", cmd_stop},
2077         {"restart", cmd_restart},
2078         {"reload", cmd_reload},
2079         {"dump", cmd_dump},
2080         {"purge", cmd_purge},
2081         {"debug", cmd_debug},
2082         {"retry", cmd_retry},
2083         {"connect", cmd_connect},
2084         {"disconnect", cmd_disconnect},
2085         {"top", cmd_top},
2086         {"pcap", cmd_pcap},
2087         {"log", cmd_log},
2088         {"pid", cmd_pid},
2089         {"config", cmd_config, true},
2090         {"add", cmd_config},
2091         {"del", cmd_config},
2092         {"get", cmd_config},
2093         {"set", cmd_config},
2094         {"init", cmd_init},
2095         {"generate-keys", cmd_generate_keys},
2096         {"generate-rsa-keys", cmd_generate_rsa_keys},
2097         {"generate-ecdsa-keys", cmd_generate_ecdsa_keys},
2098         {"help", cmd_help},
2099         {"version", cmd_version},
2100         {"info", cmd_info},
2101         {"edit", cmd_edit},
2102         {"export", cmd_export},
2103         {"export-all", cmd_export_all},
2104         {"import", cmd_import},
2105         {"exchange", cmd_exchange},
2106         {"exchange-all", cmd_exchange_all},
2107         {"invite", cmd_invite},
2108         {"join", cmd_join},
2109         {NULL, NULL},
2110 };
2111
2112 #ifdef HAVE_READLINE
2113 static char *complete_command(const char *text, int state) {
2114         static int i;
2115
2116         if(!state)
2117                 i = 0;
2118         else
2119                 i++;
2120
2121         while(commands[i].command) {
2122                 if(!commands[i].hidden && !strncasecmp(commands[i].command, text, strlen(text)))
2123                         return xstrdup(commands[i].command);
2124                 i++;
2125         }
2126
2127         return NULL;
2128 }
2129
2130 static char *complete_dump(const char *text, int state) {
2131         const char *matches[] = {"reachable", "nodes", "edges", "subnets", "connections", "graph", NULL};
2132         static int i;
2133
2134         if(!state)
2135                 i = 0;
2136         else
2137                 i++;
2138
2139         while(matches[i]) {
2140                 if(!strncasecmp(matches[i], text, strlen(text)))
2141                         return xstrdup(matches[i]);
2142                 i++;
2143         }
2144
2145         return NULL;
2146 }
2147
2148 static char *complete_config(const char *text, int state) {
2149         static int i;
2150
2151         if(!state)
2152                 i = 0;
2153         else
2154                 i++;
2155
2156         while(variables[i].name) {
2157                 char *dot = strchr(text, '.');
2158                 if(dot) {
2159                         if((variables[i].type & VAR_HOST) && !strncasecmp(variables[i].name, dot + 1, strlen(dot + 1))) {
2160                                 char *match;
2161                                 xasprintf(&match, "%.*s.%s", (int)(dot - text), text, variables[i].name);
2162                                 return match;
2163                         }
2164                 } else {
2165                         if(!strncasecmp(variables[i].name, text, strlen(text)))
2166                                 return xstrdup(variables[i].name);
2167                 }
2168                 i++;
2169         }
2170
2171         return NULL;
2172 }
2173
2174 static char *complete_info(const char *text, int state) {
2175         static int i;
2176         if(!state) {
2177                 i = 0;
2178                 if(!connect_tincd(false))
2179                         return NULL;
2180                 // Check the list of nodes
2181                 sendline(fd, "%d %d", CONTROL, REQ_DUMP_NODES);
2182                 sendline(fd, "%d %d", CONTROL, REQ_DUMP_SUBNETS);
2183         }
2184
2185         while(recvline(fd, line, sizeof line)) {
2186                 char item[4096];
2187                 int n = sscanf(line, "%d %d %s", &code, &req, item);
2188                 if(n == 2) {
2189                         i++;
2190                         if(i >= 2)
2191                                 break;
2192                         else
2193                                 continue;
2194                 }
2195
2196                 if(n != 3) {
2197                         fprintf(stderr, "Unable to parse dump from tincd, n = %d, i = %d.\n", n, i);
2198                         break;
2199                 }
2200
2201                 if(!strncmp(item, text, strlen(text)))
2202                         return xstrdup(strip_weight(item));
2203         }
2204
2205         return NULL;
2206 }
2207
2208 static char *complete_nothing(const char *text, int state) {
2209         return NULL;
2210 }
2211
2212 static char **completion (const char *text, int start, int end) {
2213         char **matches = NULL;
2214
2215         if(!start)
2216                 matches = rl_completion_matches(text, complete_command);
2217         else if(!strncasecmp(rl_line_buffer, "dump ", 5))
2218                 matches = rl_completion_matches(text, complete_dump);
2219         else if(!strncasecmp(rl_line_buffer, "add ", 4))
2220                 matches = rl_completion_matches(text, complete_config);
2221         else if(!strncasecmp(rl_line_buffer, "del ", 4))
2222                 matches = rl_completion_matches(text, complete_config);
2223         else if(!strncasecmp(rl_line_buffer, "get ", 4))
2224                 matches = rl_completion_matches(text, complete_config);
2225         else if(!strncasecmp(rl_line_buffer, "set ", 4))
2226                 matches = rl_completion_matches(text, complete_config);
2227         else if(!strncasecmp(rl_line_buffer, "info ", 5))
2228                 matches = rl_completion_matches(text, complete_info);
2229
2230         return matches;
2231 }
2232 #endif
2233
2234 static int cmd_shell(int argc, char *argv[]) {
2235         char *prompt;
2236         xasprintf(&prompt, "%s> ", identname);
2237         int result = 0;
2238         char buf[4096];
2239         char *line = NULL;
2240         int maxargs = argc + 16;
2241         char **nargv = xmalloc(maxargs * sizeof *nargv);
2242
2243         for(int i = 0; i < argc; i++)
2244                 nargv[i] = argv[i];
2245
2246 #ifdef HAVE_READLINE
2247         rl_readline_name = "tinc";
2248         rl_completion_entry_function = complete_nothing;
2249         rl_attempted_completion_function = completion;
2250         rl_filename_completion_desired = 0;
2251         char *copy = NULL;
2252 #endif
2253
2254         while(true) {
2255 #ifdef HAVE_READLINE
2256                 if(tty) {
2257                         free(copy);
2258                         free(line);
2259                         rl_basic_word_break_characters = "\t\n ";
2260                         line = readline(prompt);
2261                         if(line)
2262                                 copy = xstrdup(line);
2263                 } else {
2264                         line = fgets(buf, sizeof buf, stdin);
2265                 }
2266 #else
2267                 if(tty)
2268                         fputs(prompt, stdout);
2269
2270                 line = fgets(buf, sizeof buf, stdin);
2271 #endif
2272
2273                 if(!line)
2274                         break;
2275
2276                 /* Ignore comments */
2277
2278                 if(*line == '#')
2279                         continue;
2280
2281                 /* Split */
2282
2283                 int nargc = argc;
2284                 char *p = line + strspn(line, " \t\n");
2285                 char *next = strtok(p, " \t\n");
2286
2287                 while(p && *p) {
2288                         if(nargc >= maxargs) {
2289                                 fprintf(stderr, "next %p '%s', p %p '%s'\n", next, next, p, p);
2290                                 abort();
2291                                 maxargs *= 2;
2292                                 nargv = xrealloc(nargv, maxargs * sizeof *nargv);
2293                         }
2294
2295                         nargv[nargc++] = p;
2296                         p = next;
2297                         next = strtok(NULL, " \t\n");
2298                 }
2299
2300                 if(nargc == argc)
2301                         continue;
2302
2303                 if(!strcasecmp(nargv[argc], "exit") || !strcasecmp(nargv[argc], "quit"))
2304                         return result;
2305
2306                 bool found = false;
2307
2308                 for(int i = 0; commands[i].command; i++) {
2309                         if(!strcasecmp(nargv[argc], commands[i].command)) {
2310                                 result |= commands[i].function(nargc - argc - 1, nargv + argc + 1);
2311                                 found = true;
2312                                 break;
2313                         }
2314                 }
2315
2316 #ifdef HAVE_READLINE
2317                 if(tty && found)
2318                         add_history(copy);
2319 #endif
2320
2321                 if(!found) {
2322                         fprintf(stderr, "Unknown command `%s'.\n", nargv[argc]);
2323                         result |= 1;
2324                 }
2325         }
2326
2327         free(nargv);
2328
2329         if(tty)
2330                 printf("\n");
2331         return result;
2332 }
2333
2334
2335 int main(int argc, char *argv[]) {
2336         program_name = argv[0];
2337         orig_argv = argv;
2338         orig_argc = argc;
2339
2340         if(!parse_options(argc, argv))
2341                 return 1;
2342
2343         make_names();
2344         xasprintf(&tinc_conf, "%s" SLASH "tinc.conf", confbase);
2345         xasprintf(&hosts_dir, "%s" SLASH "hosts", confbase);
2346
2347         if(show_version) {
2348                 version();
2349                 return 0;
2350         }
2351
2352         if(show_help) {
2353                 usage(false);
2354                 return 0;
2355         }
2356
2357 #ifdef HAVE_MINGW
2358         static struct WSAData wsa_state;
2359
2360         if(WSAStartup(MAKEWORD(2, 2), &wsa_state)) {
2361                 fprintf(stderr, "System call `%s' failed: %s", "WSAStartup", winerror(GetLastError()));
2362                 return false;
2363         }
2364 #endif
2365
2366         srand(time(NULL));
2367         crypto_init();
2368
2369         tty = isatty(0) && isatty(1);
2370
2371         if(optind >= argc)
2372                 return cmd_shell(argc, argv);
2373
2374         for(int i = 0; commands[i].command; i++) {
2375                 if(!strcasecmp(argv[optind], commands[i].command))
2376                         return commands[i].function(argc - optind, argv + optind);
2377         }
2378
2379         fprintf(stderr, "Unknown command `%s'.\n", argv[optind]);
2380         usage(true);
2381         return 1;
2382 }