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

   1 /*
   2     tincctl.c -- Controlling a running tincd
   3     Copyright (C) 2007-2012 Guus Sliepen <guus@tinc-vpn.org>
   4
   5     This program is free software; you can redistribute it and/or modify
   6     it under the terms of the GNU General Public License as published by
   7     the Free Software Foundation; either version 2 of the License, or
   8     (at your option) any later version.
   9
  10     This program is distributed in the hope that it will be useful,
  11     but WITHOUT ANY WARRANTY; without even the implied warranty of
  12     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13     GNU General Public License for more details.
  14
  15     You should have received a copy of the GNU General Public License along
  16     with this program; if not, write to the Free Software Foundation, Inc.,
  17     51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  18 */
  19
  20 #include "system.h"
  21
  22 #include <getopt.h>
  23
  24 #ifdef HAVE_READLINE
  25 #include "readline/readline.h"
  26 #include "readline/history.h"
  27 #endif
  28
  29 #include "xalloc.h"
  30 #include "protocol.h"
  31 #include "control_common.h"
  32 #include "ecdsagen.h"
  33 #include "info.h"
  34 #include "rsagen.h"
  35 #include "utils.h"
  36 #include "tincctl.h"
  37 #include "top.h"
  38
  39 #ifdef HAVE_MINGW
  40 #define mkdir(a, b) mkdir(a)
  41 #endif
  42
  43
  44 /* The name this program was run with. */
  45 static char *program_name = NULL;
  46
  47 static char **orig_argv;
  48 static int orig_argc;
  49
  50 /* If nonzero, display usage information and exit. */
  51 static bool show_help = false;
  52
  53 /* If nonzero, print the version on standard output and exit.  */
  54 static bool show_version = false;
  55
  56 static char *name = NULL;
  57 static char *identname = NULL;          /* program name for syslog */
  58 static char *pidfilename = NULL;        /* pid file location */
  59 static char *confdir = NULL;
  60 static char controlcookie[1025];
  61 char *netname = NULL;
  62 char *confbase = NULL;
  63 static char *tinc_conf = NULL;
  64 static char *hosts_dir = NULL;
  65 struct timeval now;
  66
  67 // Horrible global variables...
  68 static int pid = 0;
  69 static int fd = -1;
  70 static char line[4096];
  71 static int code;
  72 static int req;
  73 static int result;
  74 static bool force = false;
  75 static bool tty = true;
  76
  77 #ifdef HAVE_MINGW
  78 static struct WSAData wsa_state;
  79 #endif
  80
  81 static struct option const long_options[] = {
  82         {"config", required_argument, NULL, 'c'},
  83         {"debug", optional_argument, NULL, 0},
  84         {"no-detach", no_argument, NULL, 0},
  85         {"mlock", no_argument, NULL, 0},
  86         {"net", required_argument, NULL, 'n'},
  87         {"help", no_argument, NULL, 1},
  88         {"version", no_argument, NULL, 2},
  89         {"pidfile", required_argument, NULL, 5},
  90         {"logfile", required_argument, NULL, 0},
  91         {"bypass-security", no_argument, NULL, 0},
  92         {"chroot", no_argument, NULL, 0},
  93         {"user", required_argument, NULL, 0},
  94         {"option", required_argument, NULL, 0},
  95         {"force", no_argument, NULL, 6},
  96         {NULL, 0, NULL, 0}
  97 };
  98
  99 static void version(void) {
 100         printf("%s version %s (built %s %s, protocol %d.%d)\n", PACKAGE,
 101                    VERSION, __DATE__, __TIME__, PROT_MAJOR, PROT_MINOR);
 102         printf("Copyright (C) 1998-2012 Ivo Timmermans, Guus Sliepen and others.\n"
 103                         "See the AUTHORS file for a complete list.\n\n"
 104                         "tinc comes with ABSOLUTELY NO WARRANTY.  This is free software,\n"
 105                         "and you are welcome to redistribute it under certain conditions;\n"
 106                         "see the file COPYING for details.\n");
 107 }
 108
 109 static void usage(bool status) {
 110         if(status)
 111                 fprintf(stderr, "Try `%s --help\' for more information.\n",
 112                                 program_name);
 113         else {
 114                 printf("Usage: %s [options] command\n\n", program_name);
 115                 printf("Valid options are:\n"
 116                                 "  -c, --config=DIR        Read configuration options from DIR.\n"
 117                                 "  -n, --net=NETNAME       Connect to net NETNAME.\n"
 118                                 "      --pidfile=FILENAME  Read control cookie from FILENAME.\n"
 119                                 "      --help              Display this help and exit.\n"
 120                                 "      --version           Output version information and exit.\n"
 121                                 "\n"
 122                                 "Valid commands are:\n"
 123                                 "  init [name]                Create initial configuration files.\n"
 124                                 "  config                     Change configuration:\n"
 125                                 "    [get] VARIABLE           - print current value of VARIABLE\n"
 126                                 "    [set] VARIABLE VALUE     - set VARIABLE to VALUE\n"
 127                                 "    add VARIABLE VALUE       - add VARIABLE with the given VALUE\n"
 128                                 "    del VARIABLE [VALUE]     - remove VARIABLE [only ones with watching VALUE]\n"
 129                                 "  start [tincd options]      Start tincd.\n"
 130                                 "  stop                       Stop tincd.\n"
 131                                 "  restart                    Restart tincd.\n"
 132                                 "  reload                     Partially reload configuration of running tincd.\n"
 133                                 "  pid                        Show PID of currently running tincd.\n"
 134                                 "  generate-keys [bits]       Generate new RSA and ECDSA public/private keypairs.\n"
 135                                 "  generate-rsa-keys [bits]   Generate a new RSA public/private keypair.\n"
 136                                 "  generate-ecdsa-keys        Generate a new ECDSA public/private keypair.\n"
 137                                 "  dump                       Dump a list of one of the following things:\n"
 138                                 "    nodes                    - all known nodes in the VPN\n"
 139                                 "    edges                    - all known connections in the VPN\n"
 140                                 "    subnets                  - all known subnets in the VPN\n"
 141                                 "    connections              - all meta connections with ourself\n"
 142                                 "    [di]graph                - graph of the VPN in dotty format\n"
 143                                 "  info NODE|SUBNET|ADDRESS   Give information about a particular NODE, SUBNET or ADDRESS.\n"
 144                                 "  purge                      Purge unreachable nodes\n"
 145                                 "  debug N                    Set debug level\n"
 146                                 "  retry                      Retry all outgoing connections\n"
 147                                 "  disconnect NODE            Close meta connection with NODE\n"
 148 #ifdef HAVE_CURSES
 149                                 "  top                        Show real-time statistics\n"
 150 #endif
 151                                 "  pcap [snaplen]             Dump traffic in pcap format [up to snaplen bytes per packet]\n"
 152                                 "  log [level]                Dump log output [up to the specified level]\n"
 153                                 "  export                     Export host configuration of local node to standard output\n"
 154                                 "  export-all                 Export all host configuration files to standard output\n"
 155                                 "  import [--force]           Import host configuration file(s) from standard input\n"
 156                                 "\n");
 157                 printf("Report bugs to tinc@tinc-vpn.org.\n");
 158         }
 159 }
 160
 161 static bool parse_options(int argc, char **argv) {
 162         int r;
 163         int option_index = 0;
 164
 165         while((r = getopt_long(argc, argv, "c:n:Dd::Lo:RU:", long_options, &option_index)) != EOF) {
 166                 switch (r) {
 167                         case 0:   /* long option */
 168                                 break;
 169
 170                         case 'c': /* config file */
 171                                 confbase = xstrdup(optarg);
 172                                 break;
 173
 174                         case 'n': /* net name given */
 175                                 netname = xstrdup(optarg);
 176                                 break;
 177
 178                         case 1:   /* show help */
 179                                 show_help = true;
 180                                 break;
 181
 182                         case 2:   /* show version */
 183                                 show_version = true;
 184                                 break;
 185
 186                         case 5:   /* open control socket here */
 187                                 pidfilename = xstrdup(optarg);
 188                                 break;
 189
 190                         case 6:   /* force */
 191                                 force = true;
 192                                 break;
 193
 194                         case '?': /* wrong options */
 195                                 usage(true);
 196                                 return false;
 197
 198                         default:
 199                                 break;
 200                 }
 201         }
 202
 203         if(!netname && (netname = getenv("NETNAME")))
 204                 netname = xstrdup(netname);
 205
 206         /* netname "." is special: a "top-level name" */
 207
 208         if(netname && (!*netname || !strcmp(netname, "."))) {
 209                 free(netname);
 210                 netname = NULL;
 211         }
 212
 213         if(netname && (strpbrk(netname, "\\/") || *netname == '.')) {
 214                 fprintf(stderr, "Invalid character in netname!\n");
 215                 return false;
 216         }
 217
 218         return true;
 219 }
 220
 221 static void disable_old_keys(const char *filename, const char *what) {
 222         char tmpfile[PATH_MAX] = "";
 223         char buf[1024];
 224         bool disabled = false;
 225         bool block = false;
 226         bool error = false;
 227         FILE *r, *w;
 228
 229         r = fopen(filename, "r");
 230         if(!r)
 231                 return;
 232
 233         snprintf(tmpfile, sizeof tmpfile, "%s.tmp", filename);
 234
 235         w = fopen(tmpfile, "w");
 236
 237         while(fgets(buf, sizeof buf, r)) {
 238                 if(!block && !strncmp(buf, "-----BEGIN ", 11)) {
 239                         if((strstr(buf, " EC ") && strstr(what, "ECDSA")) || (strstr(buf, " RSA ") && strstr(what, "RSA"))) {
 240                                 disabled = true;
 241                                 block = true;
 242                         }
 243                 }
 244
 245                 bool ecdsapubkey = !strncasecmp(buf, "ECDSAPublicKey", 14) && strchr(" \t=", buf[14]) && strstr(what, "ECDSA");
 246
 247                 if(ecdsapubkey)
 248                         disabled = true;
 249
 250                 if(w) {
 251                         if(block || ecdsapubkey)
 252                                 fputc('#', w);
 253                         if(fputs(buf, w) < 0) {
 254                                 error = true;
 255                                 break;
 256                         }
 257                 }
 258
 259                 if(block && !strncmp(buf, "-----END ", 9))
 260                         block = false;
 261         }
 262
 263         if(w)
 264                 if(fclose(w) < 0)
 265                         error = true;
 266         if(ferror(r) || fclose(r) < 0)
 267                 error = true;
 268
 269         if(disabled) {
 270                 if(!w || error) {
 271                         fprintf(stderr, "Warning: old key(s) found, remove them by hand!\n");
 272                         if(w)
 273                                 unlink(tmpfile);
 274                         return;
 275                 }
 276
 277 #ifdef HAVE_MINGW
 278                 // We cannot atomically replace files on Windows.
 279                 char bakfile[PATH_MAX] = "";
 280                 snprintf(bakfile, sizeof bakfile, "%s.bak", filename);
 281                 if(rename(filename, bakfile) || rename(tmpfile, filename)) {
 282                         rename(bakfile, filename);
 283 #else
 284                 if(rename(tmpfile, filename)) {
 285 #endif
 286                         fprintf(stderr, "Warning: old key(s) found, remove them by hand!\n");
 287                 } else  {
 288 #ifdef HAVE_MINGW
 289                         unlink(bakfile);
 290 #endif
 291                         fprintf(stderr, "Warning: old key(s) found and disabled.\n");
 292                 }
 293         }
 294
 295         unlink(tmpfile);
 296 }
 297
 298 static FILE *ask_and_open(const char *filename, const char *what, const char *mode, bool ask) {
 299         FILE *r;
 300         char *directory;
 301         char buf[PATH_MAX];
 302         char buf2[PATH_MAX];
 303
 304         /* Check stdin and stdout */
 305         if(ask && tty) {
 306                 /* Ask for a file and/or directory name. */
 307                 fprintf(stdout, "Please enter a file to save %s to [%s]: ",
 308                                 what, filename);
 309                 fflush(stdout);
 310
 311                 if(fgets(buf, sizeof buf, stdin) == NULL) {
 312                         fprintf(stderr, "Error while reading stdin: %s\n",
 313                                         strerror(errno));
 314                         return NULL;
 315                 }
 316
 317                 size_t len = strlen(buf);
 318                 if(len)
 319                         buf[--len] = 0;
 320
 321                 if(len)
 322                         filename = buf;
 323         }
 324
 325 #ifdef HAVE_MINGW
 326         if(filename[0] != '\\' && filename[0] != '/' && !strchr(filename, ':')) {
 327 #else
 328         if(filename[0] != '/') {
 329 #endif
 330                 /* The directory is a relative path or a filename. */
 331                 directory = get_current_dir_name();
 332                 snprintf(buf2, sizeof buf2, "%s" SLASH "%s", directory, filename);
 333                 filename = buf2;
 334         }
 335
 336         umask(0077); /* Disallow everything for group and other */
 337
 338         disable_old_keys(filename, what);
 339
 340         /* Open it first to keep the inode busy */
 341
 342         r = fopen(filename, mode);
 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(!ecdsa_generate(&key)) {
 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);
 371         free(privname);
 372
 373         if(!f)
 374                 return false;
 375
 376 #ifdef HAVE_FCHMOD
 377         /* Make it unreadable for others. */
 378         fchmod(fileno(f), 0600);
 379 #endif
 380
 381         ecdsa_write_pem_private_key(&key, f);
 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);
 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
 402         return true;
 403 }
 404
 405 /*
 406   Generate a public/private RSA keypair, and ask for a file to store
 407   them in.
 408 */
 409 static bool rsa_keygen(int bits, bool ask) {
 410         rsa_t key;
 411         FILE *f;
 412         char *pubname, *privname;
 413
 414         fprintf(stderr, "Generating %d bits keys:\n", bits);
 415
 416         if(!rsa_generate(&key, bits, 0x10001)) {
 417                 fprintf(stderr, "Error during key generation!\n");
 418                 return false;
 419         } else
 420                 fprintf(stderr, "Done.\n");
 421
 422         xasprintf(&privname, "%s" SLASH "rsa_key.priv", confbase);
 423         f = ask_and_open(privname, "private RSA key", "a", ask);
 424         free(privname);
 425
 426         if(!f)
 427                 return false;
 428
 429 #ifdef HAVE_FCHMOD
 430         /* Make it unreadable for others. */
 431         fchmod(fileno(f), 0600);
 432 #endif
 433
 434         rsa_write_pem_private_key(&key, f);
 435
 436         fclose(f);
 437
 438         if(name)
 439                 xasprintf(&pubname, "%s" SLASH "hosts" SLASH "%s", confbase, name);
 440         else
 441                 xasprintf(&pubname, "%s" SLASH "rsa_key.pub", confbase);
 442
 443         f = ask_and_open(pubname, "public RSA key", "a", ask);
 444         free(pubname);
 445
 446         if(!f)
 447                 return false;
 448
 449         rsa_write_pem_public_key(&key, f);
 450
 451         fclose(f);
 452
 453         return true;
 454 }
 455
 456 /*
 457   Set all files and paths according to netname
 458 */
 459 static void make_names(void) {
 460 #ifdef HAVE_MINGW
 461         HKEY key;
 462         char installdir[1024] = "";
 463         long len = sizeof installdir;
 464 #endif
 465
 466         if(netname)
 467                 xasprintf(&identname, "tinc.%s", netname);
 468         else
 469                 identname = xstrdup("tinc");
 470
 471 #ifdef HAVE_MINGW
 472         if(!RegOpenKeyEx(HKEY_LOCAL_MACHINE, "SOFTWARE\\tinc", 0, KEY_READ, &key)) {
 473                 if(!RegQueryValueEx(key, NULL, 0, 0, installdir, &len)) {
 474                         if(!confbase) {
 475                                 if(netname)
 476                                         xasprintf(&confbase, "%s" SLASH "%s", installdir, netname);
 477                                 else
 478                                         xasprintf(&confbase, "%s", installdir);
 479                         }
 480                 }
 481                 if(!pidfilename)
 482                         xasprintf(&pidfilename, "%s" SLASH "pid", confbase);
 483                 RegCloseKey(key);
 484         }
 485
 486         if(!*installdir) {
 487 #endif
 488         confdir = xstrdup(CONFDIR);
 489
 490         if(!pidfilename)
 491                 xasprintf(&pidfilename, "%s" SLASH "run" SLASH "%s.pid", LOCALSTATEDIR, identname);
 492
 493         if(netname) {
 494                 if(!confbase)
 495                         xasprintf(&confbase, CONFDIR SLASH "tinc" SLASH "%s", netname);
 496                 else
 497                         fprintf(stderr, "Both netname and configuration directory given, using the latter...\n");
 498         } else {
 499                 if(!confbase)
 500                         xasprintf(&confbase, CONFDIR SLASH "tinc");
 501         }
 502
 503 #ifdef HAVE_MINGW
 504         } else
 505                 confdir = xstrdup(installdir);
 506 #endif
 507
 508         xasprintf(&tinc_conf, "%s" SLASH "tinc.conf", confbase);
 509         xasprintf(&hosts_dir, "%s" SLASH "hosts", confbase);
 510 }
 511
 512 static char buffer[4096];
 513 static size_t blen = 0;
 514
 515 bool recvline(int fd, char *line, size_t len) {
 516         char *newline = NULL;
 517
 518         while(!(newline = memchr(buffer, '\n', blen))) {
 519                 int result = recv(fd, buffer + blen, sizeof buffer - blen, 0);
 520                 if(result == -1 && errno == EINTR)
 521                         continue;
 522                 else if(result <= 0)
 523                         return false;
 524                 blen += result;
 525         }
 526
 527         if(newline - buffer >= len)
 528                 return false;
 529
 530         len = newline - buffer;
 531
 532         memcpy(line, buffer, len);
 533         line[len] = 0;
 534         memmove(buffer, newline + 1, blen - len - 1);
 535         blen -= len + 1;
 536
 537         return true;
 538 }
 539
 540 static bool recvdata(int fd, char *data, size_t len) {
 541         while(blen < len) {
 542                 int result = recv(fd, buffer + blen, sizeof buffer - blen, 0);
 543                 if(result == -1 && errno == EINTR)
 544                         continue;
 545                 else if(result <= 0)
 546                         return false;
 547                 blen += result;
 548         }
 549
 550         memcpy(data, buffer, len);
 551         memmove(buffer, buffer + len, blen - len);
 552         blen -= len;
 553
 554         return true;
 555 }
 556
 557 bool sendline(int fd, char *format, ...) {
 558         static char buffer[4096];
 559         char *p = buffer;
 560         int blen = 0;
 561         va_list ap;
 562
 563         va_start(ap, format);
 564         blen = vsnprintf(buffer, sizeof buffer, format, ap);
 565         va_end(ap);
 566
 567         if(blen < 1 || blen >= sizeof buffer)
 568                 return false;
 569
 570         buffer[blen] = '\n';
 571         blen++;
 572
 573         while(blen) {
 574                 int result = send(fd, p, blen, 0);
 575                 if(result == -1 && errno == EINTR)
 576                         continue;
 577                 else if(result <= 0)
 578                         return false;
 579                 p += result;
 580                 blen -= result;
 581         }
 582
 583         return true;
 584 }
 585
 586 static void pcap(int fd, FILE *out, int snaplen) {
 587         sendline(fd, "%d %d %d", CONTROL, REQ_PCAP, snaplen);
 588         char data[9018];
 589
 590         struct {
 591                 uint32_t magic;
 592                 uint16_t major;
 593                 uint16_t minor;
 594                 uint32_t tz_offset;
 595                 uint32_t tz_accuracy;
 596                 uint32_t snaplen;
 597                 uint32_t ll_type;
 598         } header = {
 599                 0xa1b2c3d4,
 600                 2, 4,
 601                 0, 0,
 602                 snaplen ?: sizeof data,
 603                 1,
 604         };
 605
 606         struct {
 607                 uint32_t tv_sec;
 608                 uint32_t tv_usec;
 609                 uint32_t len;
 610                 uint32_t origlen;
 611         } packet;
 612
 613         struct timeval tv;
 614
 615         fwrite(&header, sizeof header, 1, out);
 616         fflush(out);
 617
 618         char line[32];
 619         while(recvline(fd, line, sizeof line)) {
 620                 int code, req, len;
 621                 int n = sscanf(line, "%d %d %d", &code, &req, &len);
 622                 gettimeofday(&tv, NULL);
 623                 if(n != 3 || code != CONTROL || req != REQ_PCAP || len < 0 || len > sizeof data)
 624                         break;
 625                 if(!recvdata(fd, data, len))
 626                         break;
 627                 packet.tv_sec = tv.tv_sec;
 628                 packet.tv_usec = tv.tv_usec;
 629                 packet.len = len;
 630                 packet.origlen = len;
 631                 fwrite(&packet, sizeof packet, 1, out);
 632                 fwrite(data, len, 1, out);
 633                 fflush(out);
 634         }
 635 }
 636
 637 static void logcontrol(int fd, FILE *out, int level) {
 638         sendline(fd, "%d %d %d", CONTROL, REQ_LOG, level);
 639         char data[1024];
 640         char line[32];
 641
 642         while(recvline(fd, line, sizeof line)) {
 643                 int code, req, len;
 644                 int n = sscanf(line, "%d %d %d", &code, &req, &len);
 645                 if(n != 3 || code != CONTROL || req != REQ_LOG || len < 0 || len > sizeof data)
 646                         break;
 647                 if(!recvdata(fd, data, len))
 648                         break;
 649                 fwrite(data, len, 1, out);
 650                 fputc('\n', out);
 651                 fflush(out);
 652         }
 653 }
 654
 655 #ifdef HAVE_MINGW
 656 static bool remove_service(void) {
 657         SC_HANDLE manager = NULL;
 658         SC_HANDLE service = NULL;
 659         SERVICE_STATUS status = {0};
 660
 661         manager = OpenSCManager(NULL, NULL, SC_MANAGER_ALL_ACCESS);
 662         if(!manager) {
 663                 fprintf(stderr, "Could not open service manager: %s\n", winerror(GetLastError()));
 664                 return false;
 665         }
 666
 667         service = OpenService(manager, identname, SERVICE_ALL_ACCESS);
 668
 669         if(!service) {
 670                 fprintf(stderr, "Could not open %s service: %s\n", identname, winerror(GetLastError()));
 671                 return false;
 672         }
 673
 674         if(!ControlService(service, SERVICE_CONTROL_STOP, &status))
 675                 fprintf(stderr, "Could not stop %s service: %s\n", identname, winerror(GetLastError()));
 676         else
 677                 fprintf(stderr, "%s service stopped\n", identname);
 678
 679         if(!DeleteService(service)) {
 680                 fprintf(stderr, "Could not remove %s service: %s\n", identname, winerror(GetLastError()));
 681                 return false;
 682         }
 683
 684         fprintf(stderr, "%s service removed\n", identname);
 685
 686         return true;
 687 }
 688 #endif
 689
 690 static bool connect_tincd(bool verbose) {
 691         if(fd >= 0) {
 692                 fd_set r;
 693                 FD_ZERO(&r);
 694                 FD_SET(fd, &r);
 695                 struct timeval tv = {0, 0};
 696                 if(select(fd + 1, &r, NULL, NULL, &tv)) {
 697                         fprintf(stderr, "Previous connection to tincd lost, reconnecting.\n");
 698                         close(fd);
 699                         fd = -1;
 700                 } else {
 701                         return true;
 702                 }
 703         }
 704
 705         FILE *f = fopen(pidfilename, "r");
 706         if(!f) {
 707                 if(verbose)
 708                         fprintf(stderr, "Could not open pid file %s: %s\n", pidfilename, strerror(errno));
 709                 return false;
 710         }
 711
 712         char host[129];
 713         char port[129];
 714
 715         if(fscanf(f, "%20d %1024s %128s port %128s", &pid, controlcookie, host, port) != 4) {
 716                 if(verbose)
 717                         fprintf(stderr, "Could not parse pid file %s\n", pidfilename);
 718                 fclose(f);
 719                 return false;
 720         }
 721
 722         fclose(f);
 723
 724 #ifdef HAVE_MINGW
 725         if(WSAStartup(MAKEWORD(2, 2), &wsa_state)) {
 726                 if(verbose)
 727                         fprintf(stderr, "System call `%s' failed: %s", "WSAStartup", winerror(GetLastError()));
 728                 return false;
 729         }
 730 #endif
 731
 732         struct addrinfo hints = {
 733                 .ai_family = AF_UNSPEC,
 734                 .ai_socktype = SOCK_STREAM,
 735                 .ai_protocol = IPPROTO_TCP,
 736                 .ai_flags = 0,
 737         };
 738
 739         struct addrinfo *res = NULL;
 740
 741         if(getaddrinfo(host, port, &hints, &res) || !res) {
 742                 if(verbose)
 743                         fprintf(stderr, "Cannot resolve %s port %s: %s", host, port, strerror(errno));
 744                 return false;
 745         }
 746
 747         fd = socket(res->ai_family, SOCK_STREAM, IPPROTO_TCP);
 748         if(fd < 0) {
 749                 if(verbose)
 750                         fprintf(stderr, "Cannot create TCP socket: %s\n", sockstrerror(sockerrno));
 751                 return false;
 752         }
 753
 754 #ifdef HAVE_MINGW
 755         unsigned long arg = 0;
 756
 757         if(ioctlsocket(fd, FIONBIO, &arg) != 0) {
 758                 if(verbose)
 759                         fprintf(stderr, "ioctlsocket failed: %s", sockstrerror(sockerrno));
 760         }
 761 #endif
 762
 763         if(connect(fd, res->ai_addr, res->ai_addrlen) < 0) {
 764                 if(verbose)
 765                         fprintf(stderr, "Cannot connect to %s port %s: %s\n", host, port, sockstrerror(sockerrno));
 766                 close(fd);
 767                 fd = -1;
 768                 return false;
 769         }
 770
 771         freeaddrinfo(res);
 772
 773         char data[4096];
 774         int version;
 775
 776         if(!recvline(fd, line, sizeof line) || sscanf(line, "%d %s %d", &code, data, &version) != 3 || code != 0) {
 777                 if(verbose)
 778                         fprintf(stderr, "Cannot read greeting from control socket: %s\n", sockstrerror(sockerrno));
 779                 close(fd);
 780                 fd = -1;
 781                 return false;
 782         }
 783
 784         sendline(fd, "%d ^%s %d", ID, controlcookie, TINC_CTL_VERSION_CURRENT);
 785
 786         if(!recvline(fd, line, sizeof line) || sscanf(line, "%d %d %d", &code, &version, &pid) != 3 || code != 4 || version != TINC_CTL_VERSION_CURRENT) {
 787                 if(verbose)
 788                         fprintf(stderr, "Could not fully establish control socket connection\n");
 789                 close(fd);
 790                 fd = -1;
 791                 return false;
 792         }
 793
 794         return true;
 795 }
 796
 797
 798 static int cmd_start(int argc, char *argv[]) {
 799         if(connect_tincd(false)) {
 800                 if(netname)
 801                         fprintf(stderr, "A tincd is already running for net `%s' with pid %d.\n", netname, pid);
 802                 else
 803                         fprintf(stderr, "A tincd is already running with pid %d.\n", pid);
 804                 return 0;
 805         }
 806
 807         char *c;
 808         char *slash = strrchr(program_name, '/');
 809
 810 #ifdef HAVE_MINGW
 811         if ((c = strrchr(program_name, '\\')) > slash)
 812                 slash = c;
 813 #endif
 814
 815         if (slash++)
 816                 xasprintf(&c, "%.*stincd", (int)(slash - program_name), program_name);
 817         else
 818                 c = "tincd";
 819
 820         int nargc = 0;
 821         char **nargv = xmalloc_and_zero((optind + argc) * sizeof *nargv);
 822
 823         nargv[nargc++] = c;
 824         for(int i = 1; i < optind; i++)
 825                 nargv[nargc++] = orig_argv[i];
 826         for(int i = 1; i < argc; i++)
 827                 nargv[nargc++] = argv[i];
 828
 829 #ifdef HAVE_MINGW
 830         execvp(c, nargv);
 831         fprintf(stderr, "Error starting %s: %s\n", c, strerror(errno));
 832         return 1;
 833 #else
 834         pid_t pid = fork();
 835         if(pid == -1) {
 836                 fprintf(stderr, "Could not fork: %s\n", strerror(errno));
 837                 free(nargv);
 838                 return 1;
 839         }
 840
 841         if(!pid)
 842                 exit(execvp(c, nargv));
 843
 844         free(nargv);
 845
 846         int status = -1;
 847         if(waitpid(pid, &status, 0) != pid || !WIFEXITED(status) || WEXITSTATUS(status)) {
 848                 fprintf(stderr, "Error starting %s\n", c);
 849                 return 1;
 850         }
 851
 852         return 0;
 853 #endif
 854 }
 855
 856 static int cmd_stop(int argc, char *argv[]) {
 857 #ifndef HAVE_MINGW
 858         if(!connect_tincd(true)) {
 859                 if(pid) {
 860                         if(kill(pid, SIGTERM)) {
 861                                 fprintf(stderr, "Could not send TERM signal to process with PID %u: %s\n", pid, strerror(errno));
 862                                 return 1;
 863                         }
 864
 865                         fprintf(stderr, "Sent TERM signal to process with PID %u.\n", pid);
 866                         waitpid(pid, NULL, 0);
 867                         return 0;
 868                 }
 869
 870                 return 1;
 871         }
 872
 873         sendline(fd, "%d %d", CONTROL, REQ_STOP);
 874         if(!recvline(fd, line, sizeof line) || sscanf(line, "%d %d %d", &code, &req, &result) != 3 || code != CONTROL || req != REQ_STOP || result) {
 875                 fprintf(stderr, "Could not stop tinc daemon.\n");
 876                 return 1;
 877         }
 878
 879         // Wait for tincd to close the connection...
 880         fd_set r;
 881         FD_ZERO(&r);
 882         FD_SET(fd, &r);
 883         select(fd + 1, &r, NULL, NULL, NULL);
 884 #else
 885         if(!remove_service())
 886                 return 1;
 887 #endif
 888         close(fd);
 889         pid = 0;
 890         fd = -1;
 891
 892         return 0;
 893 }
 894
 895 static int cmd_restart(int argc, char *argv[]) {
 896         cmd_stop(argc, argv);
 897         return cmd_start(argc, argv);
 898 }
 899
 900 static int cmd_reload(int argc, char *argv[]) {
 901         if(!connect_tincd(true))
 902                 return 1;
 903
 904         sendline(fd, "%d %d", CONTROL, REQ_RELOAD);
 905         if(!recvline(fd, line, sizeof line) || sscanf(line, "%d %d %d", &code, &req, &result) != 3 || code != CONTROL || req != REQ_RELOAD || result) {
 906                 fprintf(stderr, "Could not reload configuration.\n");
 907                 return 1;
 908         }
 909
 910         return 0;
 911
 912 }
 913
 914 static int cmd_dump(int argc, char *argv[]) {
 915         if(argc != 2) {
 916                 fprintf(stderr, "Invalid number of arguments.\n");
 917                 usage(true);
 918                 return 1;
 919         }
 920
 921         if(!connect_tincd(true))
 922                 return 1;
 923
 924         int do_graph = 0;
 925
 926         if(!strcasecmp(argv[1], "nodes"))
 927                 sendline(fd, "%d %d", CONTROL, REQ_DUMP_NODES);
 928         else if(!strcasecmp(argv[1], "edges"))
 929                 sendline(fd, "%d %d", CONTROL, REQ_DUMP_EDGES);
 930         else if(!strcasecmp(argv[1], "subnets"))
 931                 sendline(fd, "%d %d", CONTROL, REQ_DUMP_SUBNETS);
 932         else if(!strcasecmp(argv[1], "connections"))
 933                 sendline(fd, "%d %d", CONTROL, REQ_DUMP_CONNECTIONS);
 934         else if(!strcasecmp(argv[1], "graph")) {
 935                 sendline(fd, "%d %d", CONTROL, REQ_DUMP_NODES);
 936                 sendline(fd, "%d %d", CONTROL, REQ_DUMP_EDGES);
 937                 do_graph = 1;
 938         } else if(!strcasecmp(argv[1], "digraph")) {
 939                 sendline(fd, "%d %d", CONTROL, REQ_DUMP_NODES);
 940                 sendline(fd, "%d %d", CONTROL, REQ_DUMP_EDGES);
 941                 do_graph = 2;
 942         } else {
 943                 fprintf(stderr, "Unknown dump type '%s'.\n", argv[1]);
 944                 usage(true);
 945                 return 1;
 946         }
 947
 948         if(do_graph == 1)
 949                 printf("graph {\n");
 950         else if(do_graph == 2)
 951                 printf("digraph {\n");
 952
 953         while(recvline(fd, line, sizeof line)) {
 954                 char node1[4096], node2[4096];
 955                 int n = sscanf(line, "%d %d %s %s", &code, &req, node1, node2);
 956                 if(n == 2) {
 957                         if(do_graph && req == REQ_DUMP_NODES)
 958                                 continue;
 959                         else {
 960                                 if(do_graph)
 961                                         printf("}\n");
 962                                 return 0;
 963                         }
 964                 }
 965                 if(n < 2)
 966                         break;
 967
 968                 char node[4096];
 969                 char from[4096];
 970                 char to[4096];
 971                 char subnet[4096];
 972                 char host[4096];
 973                 char port[4096];
 974                 char via[4096];
 975                 char nexthop[4096];
 976                 int cipher, digest, maclength, compression, distance, socket, weight;
 977                 short int pmtu, minmtu, maxmtu;
 978                 unsigned int options, status_int;
 979                 node_status_t status;
 980                 long int last_state_change;
 981
 982                 switch(req) {
 983                         case REQ_DUMP_NODES: {
 984                                 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);
 985                                 if(n != 16) {
 986                                         fprintf(stderr, "Unable to parse node dump from tincd: %s\n", line);
 987                                         return 1;
 988                                 }
 989                                 if(do_graph) {
 990                                         memcpy(&status, &status_int, sizeof status);
 991                                         const char *color = "black";
 992                                         if(!strcmp(host, "MYSELF"))
 993                                                 color = "green";
 994                                         else if(!status.reachable)
 995                                                 color = "red";
 996                                         else if(strcmp(via, node))
 997                                                 color = "orange";
 998                                         else if(!status.validkey)
 999                                                 color = "black";
1000                                         else if(minmtu > 0)
1001                                                 color = "green";
1002                                         printf(" %s [label = \"%s\", color = \"%s\"%s];\n", node, node, color, strcmp(host, "MYSELF") ? "" : ", style = \"filled\"");
1003                                 } else {
1004                                         printf("%s at %s port %s cipher %d digest %d maclength %d compression %d options %x status %04x nexthop %s via %s distance %d pmtu %hd (min %hd max %hd)\n",
1005                                                         node, host, port, cipher, digest, maclength, compression, options, status_int, nexthop, via, distance, pmtu, minmtu, maxmtu);
1006                                 }
1007                         } break;
1008
1009                         case REQ_DUMP_EDGES: {
1010                                 int n = sscanf(line, "%*d %*d %s %s %s port %s %x %d", from, to, host, port, &options, &weight);
1011                                 if(n != 6) {
1012                                         fprintf(stderr, "Unable to parse edge dump from tincd.\n");
1013                                         return 1;
1014                                 }
1015
1016                                 if(do_graph) {
1017                                         float w = 1 + 65536.0 / weight;
1018                                         if(do_graph == 1 && strcmp(node1, node2) > 0)
1019                                                 printf(" %s -- %s [w = %f, weight = %f];\n", node1, node2, w, w);
1020                                         else if(do_graph == 2)
1021                                                 printf(" %s -> %s [w = %f, weight = %f];\n", node1, node2, w, w);
1022                                 } else {
1023                                         printf("%s to %s at %s port %s options %x weight %d\n", from, to, host, port, options, weight);
1024                                 }
1025                         } break;
1026
1027                         case REQ_DUMP_SUBNETS: {
1028                                 int n = sscanf(line, "%*d %*d %s %s", subnet, node);
1029                                 if(n != 2) {
1030                                         fprintf(stderr, "Unable to parse subnet dump from tincd.\n");
1031                                         return 1;
1032                                 }
1033                                 printf("%s owner %s\n", strip_weight(subnet), node);
1034                         } break;
1035
1036                         case REQ_DUMP_CONNECTIONS: {
1037                                 int n = sscanf(line, "%*d %*d %s %s port %s %x %d %x", node, host, port, &options, &socket, &status_int);
1038                                 if(n != 6) {
1039                                         fprintf(stderr, "Unable to parse connection dump from tincd.\n");
1040                                         return 1;
1041                                 }
1042                                 printf("%s at %s port %s options %x socket %d status %x\n", node, host, port, options, socket, status_int);
1043                         } break;
1044
1045                         default:
1046                                 fprintf(stderr, "Unable to parse dump from tincd.\n");
1047                                 return 1;
1048                 }
1049         }
1050
1051         fprintf(stderr, "Error receiving dump.\n");
1052         return 1;
1053 }
1054
1055 static int cmd_purge(int argc, char *argv[]) {
1056         if(!connect_tincd(true))
1057                 return 1;
1058
1059         sendline(fd, "%d %d", CONTROL, REQ_PURGE);
1060         if(!recvline(fd, line, sizeof line) || sscanf(line, "%d %d %d", &code, &req, &result) != 3 || code != CONTROL || req != REQ_PURGE || result) {
1061                 fprintf(stderr, "Could not purge old information.\n");
1062                 return 1;
1063         }
1064
1065         return 0;
1066 }
1067
1068 static int cmd_debug(int argc, char *argv[]) {
1069         if(argc != 2) {
1070                 fprintf(stderr, "Invalid number of arguments.\n");
1071                 return 1;
1072         }
1073
1074         if(!connect_tincd(true))
1075                 return 1;
1076
1077         int debuglevel = atoi(argv[1]);
1078         int origlevel;
1079
1080         sendline(fd, "%d %d %d", CONTROL, REQ_SET_DEBUG, debuglevel);
1081         if(!recvline(fd, line, sizeof line) || sscanf(line, "%d %d %d", &code, &req, &origlevel) != 3 || code != CONTROL || req != REQ_SET_DEBUG) {
1082                 fprintf(stderr, "Could not set debug level.\n");
1083                 return 1;
1084         }
1085
1086         fprintf(stderr, "Old level %d, new level %d.\n", origlevel, debuglevel);
1087         return 0;
1088 }
1089
1090 static int cmd_retry(int argc, char *argv[]) {
1091         if(!connect_tincd(true))
1092                 return 1;
1093
1094         sendline(fd, "%d %d", CONTROL, REQ_RETRY);
1095         if(!recvline(fd, line, sizeof line) || sscanf(line, "%d %d %d", &code, &req, &result) != 3 || code != CONTROL || req != REQ_RETRY || result) {
1096                 fprintf(stderr, "Could not retry outgoing connections.\n");
1097                 return 1;
1098         }
1099
1100         return 0;
1101 }
1102
1103 static int cmd_connect(int argc, char *argv[]) {
1104         if(argc != 2) {
1105                 fprintf(stderr, "Invalid number of arguments.\n");
1106                 return 1;
1107         }
1108
1109         if(!check_id(argv[1])) {
1110                 fprintf(stderr, "Invalid name for node.\n");
1111                 return 1;
1112         }
1113
1114         if(!connect_tincd(true))
1115                 return 1;
1116
1117         sendline(fd, "%d %d %s", CONTROL, REQ_CONNECT, argv[1]);
1118         if(!recvline(fd, line, sizeof line) || sscanf(line, "%d %d %d", &code, &req, &result) != 3 || code != CONTROL || req != REQ_CONNECT || result) {
1119                 fprintf(stderr, "Could not connect to %s.\n", argv[1]);
1120                 return 1;
1121         }
1122
1123         return 0;
1124 }
1125
1126 static int cmd_disconnect(int argc, char *argv[]) {
1127         if(argc != 2) {
1128                 fprintf(stderr, "Invalid number of arguments.\n");
1129                 return 1;
1130         }
1131
1132         if(!check_id(argv[1])) {
1133                 fprintf(stderr, "Invalid name for node.\n");
1134                 return 1;
1135         }
1136
1137         if(!connect_tincd(true))
1138                 return 1;
1139
1140         sendline(fd, "%d %d %s", CONTROL, REQ_DISCONNECT, argv[1]);
1141         if(!recvline(fd, line, sizeof line) || sscanf(line, "%d %d %d", &code, &req, &result) != 3 || code != CONTROL || req != REQ_DISCONNECT || result) {
1142                 fprintf(stderr, "Could not disconnect %s.\n", argv[1]);
1143                 return 1;
1144         }
1145
1146         return 0;
1147 }
1148
1149 static int cmd_top(int argc, char *argv[]) {
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(!connect_tincd(true))
1164                 return 1;
1165
1166         pcap(fd, stdout, argc > 1 ? atoi(argv[1]) : 0);
1167         return 0;
1168 }
1169
1170 static int cmd_log(int argc, char *argv[]) {
1171         if(!connect_tincd(true))
1172                 return 1;
1173
1174         logcontrol(fd, stdout, argc > 1 ? atoi(argv[1]) : -1);
1175         return 0;
1176 }
1177
1178 static int cmd_pid(int argc, char *argv[]) {
1179         if(!connect_tincd(true) && !pid)
1180                 return 1;
1181
1182         printf("%d\n", pid);
1183         return 0;
1184 }
1185
1186 static int rstrip(char *value) {
1187         int len = strlen(value);
1188         while(len && strchr("\t\r\n ", value[len - 1]))
1189                 value[--len] = 0;
1190         return len;
1191 }
1192
1193 static char *get_my_name() {
1194         FILE *f = fopen(tinc_conf, "r");
1195         if(!f) {
1196                 fprintf(stderr, "Could not open %s: %s\n", tinc_conf, strerror(errno));
1197                 return NULL;
1198         }
1199
1200         char buf[4096];
1201         char *value;
1202         while(fgets(buf, sizeof buf, f)) {
1203                 int len = strcspn(buf, "\t =");
1204                 value = buf + len;
1205                 value += strspn(value, "\t ");
1206                 if(*value == '=') {
1207                         value++;
1208                         value += strspn(value, "\t ");
1209                 }
1210                 if(!rstrip(value))
1211                         continue;
1212                 buf[len] = 0;
1213                 if(strcasecmp(buf, "Name"))
1214                         continue;
1215                 if(*value) {
1216                         fclose(f);
1217                         return strdup(value);
1218                 }
1219         }
1220
1221         fclose(f);
1222         fprintf(stderr, "Could not find Name in %s.\n", tinc_conf);
1223         return NULL;
1224 }
1225
1226 #define VAR_SERVER 1    /* Should be in tinc.conf */
1227 #define VAR_HOST 2      /* Can be in host config file */
1228 #define VAR_MULTIPLE 4  /* Multiple statements allowed */
1229 #define VAR_OBSOLETE 8  /* Should not be used anymore */
1230
1231 static struct {
1232         const char *name;
1233         int type;
1234 } const variables[] = {
1235         /* Server configuration */
1236         {"AddressFamily", VAR_SERVER},
1237         {"AutoConnect", VAR_SERVER},
1238         {"BindToAddress", VAR_SERVER | VAR_MULTIPLE},
1239         {"BindToInterface", VAR_SERVER},
1240         {"Broadcast", VAR_SERVER},
1241         {"ConnectTo", VAR_SERVER | VAR_MULTIPLE},
1242         {"DecrementTTL", VAR_SERVER},
1243         {"Device", VAR_SERVER},
1244         {"DeviceType", VAR_SERVER},
1245         {"DirectOnly", VAR_SERVER},
1246         {"ECDSAPrivateKeyFile", VAR_SERVER},
1247         {"ExperimentalProtocol", VAR_SERVER},
1248         {"Forwarding", VAR_SERVER},
1249         {"GraphDumpFile", VAR_SERVER | VAR_OBSOLETE},
1250         {"Hostnames", VAR_SERVER},
1251         {"IffOneQueue", VAR_SERVER},
1252         {"Interface", VAR_SERVER},
1253         {"KeyExpire", VAR_SERVER},
1254         {"LocalDiscovery", VAR_SERVER},
1255         {"MACExpire", VAR_SERVER},
1256         {"MaxOutputBufferSize", VAR_SERVER},
1257         {"MaxTimeout", VAR_SERVER},
1258         {"Mode", VAR_SERVER},
1259         {"Name", VAR_SERVER},
1260         {"PingInterval", VAR_SERVER},
1261         {"PingTimeout", VAR_SERVER},
1262         {"PriorityInheritance", VAR_SERVER},
1263         {"PrivateKey", VAR_SERVER | VAR_OBSOLETE},
1264         {"PrivateKeyFile", VAR_SERVER},
1265         {"ProcessPriority", VAR_SERVER},
1266         {"Proxy", VAR_SERVER},
1267         {"ReplayWindow", VAR_SERVER},
1268         {"ScriptsExtension", VAR_SERVER},
1269         {"ScriptsInterpreter", VAR_SERVER},
1270         {"StrictSubnets", VAR_SERVER},
1271         {"TunnelServer", VAR_SERVER},
1272         {"UDPRcvBuf", VAR_SERVER},
1273         {"UDPSndBuf", VAR_SERVER},
1274         {"VDEGroup", VAR_SERVER},
1275         {"VDEPort", VAR_SERVER},
1276         /* Host configuration */
1277         {"Address", VAR_HOST | VAR_MULTIPLE},
1278         {"Cipher", VAR_SERVER | VAR_HOST},
1279         {"ClampMSS", VAR_SERVER | VAR_HOST},
1280         {"Compression", VAR_SERVER | VAR_HOST},
1281         {"Digest", VAR_SERVER | VAR_HOST},
1282         {"ECDSAPublicKey", VAR_HOST},
1283         {"ECDSAPublicKeyFile", VAR_SERVER | VAR_HOST},
1284         {"IndirectData", VAR_SERVER | VAR_HOST},
1285         {"MACLength", VAR_SERVER | VAR_HOST},
1286         {"PMTU", VAR_SERVER | VAR_HOST},
1287         {"PMTUDiscovery", VAR_SERVER | VAR_HOST},
1288         {"Port", VAR_HOST},
1289         {"PublicKey", VAR_HOST | VAR_OBSOLETE},
1290         {"PublicKeyFile", VAR_SERVER | VAR_HOST | VAR_OBSOLETE},
1291         {"Subnet", VAR_HOST | VAR_MULTIPLE},
1292         {"TCPOnly", VAR_SERVER | VAR_HOST},
1293         {"Weight", VAR_HOST},
1294         {NULL, 0}
1295 };
1296
1297 static int cmd_config(int argc, char *argv[]) {
1298         if(argc < 2) {
1299                 fprintf(stderr, "Invalid number of arguments.\n");
1300                 return 1;
1301         }
1302
1303         int action = -2;
1304         if(!strcasecmp(argv[1], "get")) {
1305                 argv++, argc--;
1306         } else if(!strcasecmp(argv[1], "add")) {
1307                 argv++, argc--, action = 1;
1308         } else if(!strcasecmp(argv[1], "del")) {
1309                 argv++, argc--, action = -1;
1310         } else if(!strcasecmp(argv[1], "replace") || !strcasecmp(argv[1], "set") || !strcasecmp(argv[1], "change")) {
1311                 argv++, argc--, action = 0;
1312         }
1313
1314         if(argc < 2) {
1315                 fprintf(stderr, "Invalid number of arguments.\n");
1316                 return 1;
1317         }
1318
1319         // Concatenate the rest of the command line
1320         strncpy(line, argv[1], sizeof line - 1);
1321         for(int i = 2; i < argc; i++) {
1322                 strncat(line, " ", sizeof line - 1 - strlen(line));
1323                 strncat(line, argv[i], sizeof line - 1 - strlen(line));
1324         }
1325
1326         // Liberal parsing into node name, variable name and value.
1327         char *node = NULL;
1328         char *variable;
1329         char *value;
1330         int len;
1331
1332         len = strcspn(line, "\t =");
1333         value = line + len;
1334         value += strspn(value, "\t ");
1335         if(*value == '=') {
1336                 value++;
1337                 value += strspn(value, "\t ");
1338         }
1339         line[len] = '\0';
1340         variable = strchr(line, '.');
1341         if(variable) {
1342                 node = line;
1343                 *variable++ = 0;
1344         } else {
1345                 variable = line;
1346         }
1347
1348         if(!*variable) {
1349                 fprintf(stderr, "No variable given.\n");
1350                 return 1;
1351         }
1352
1353         if(action >= 0 && !*value) {
1354                 fprintf(stderr, "No value for variable given.\n");
1355                 return 1;
1356         }
1357
1358         if(action < -1 && *value)
1359                 action = 0;
1360
1361         /* Some simple checks. */
1362         bool found = false;
1363
1364         for(int i = 0; variables[i].name; i++) {
1365                 if(strcasecmp(variables[i].name, variable))
1366                         continue;
1367
1368                 found = true;
1369                 variable = (char *)variables[i].name;
1370
1371                 /* Discourage use of obsolete variables. */
1372
1373                 if(variables[i].type & VAR_OBSOLETE && action >= 0) {
1374                         if(force) {
1375                                 fprintf(stderr, "Warning: %s is an obsolete variable!\n", variable);
1376                         } else {
1377                                 fprintf(stderr, "%s is an obsolete variable! Use --force to use it anyway.\n", variable);
1378                                 return 1;
1379                         }
1380                 }
1381
1382                 /* Don't put server variables in host config files */
1383
1384                 if(node && !(variables[i].type & VAR_HOST) && action >= 0) {
1385                         if(force) {
1386                                 fprintf(stderr, "Warning: %s is not a host configuration variable!\n", variable);
1387                         } else {
1388                                 fprintf(stderr, "%s is not a host configuration variable! Use --force to use it anyway.\n", variable);
1389                                 return 1;
1390                         }
1391                 }
1392
1393                 /* Should this go into our own host config file? */
1394
1395                 if(!node && !(variables[i].type & VAR_SERVER)) {
1396                         node = get_my_name();
1397                         if(!node)
1398                                 return 1;
1399                 }
1400
1401                 break;
1402         }
1403
1404         if(node && !check_id(node)) {
1405                 fprintf(stderr, "Invalid name for node.\n");
1406                 return 1;
1407         }
1408
1409         if(!found) {
1410                 if(force || action < 0) {
1411                         fprintf(stderr, "Warning: %s is not a known configuration variable!\n", variable);
1412                 } else {
1413                         fprintf(stderr, "%s: is not a known configuration variable! Use --force to use it anyway.\n", variable);
1414                         return 1;
1415                 }
1416         }
1417
1418         // Open the right configuration file.
1419         char *filename;
1420         if(node)
1421                 xasprintf(&filename, "%s" SLASH "%s", hosts_dir, node);
1422         else
1423                 filename = tinc_conf;
1424
1425         FILE *f = fopen(filename, "r");
1426         if(!f) {
1427                 if(action < 0 || errno != ENOENT) {
1428                         fprintf(stderr, "Could not open configuration file %s: %s\n", filename, strerror(errno));
1429                         return 1;
1430                 }
1431
1432                 // If it doesn't exist, create it.
1433                 f = fopen(filename, "a+");
1434                 if(!f) {
1435                         fprintf(stderr, "Could not create configuration file %s: %s\n", filename, strerror(errno));
1436                         return 1;
1437                 } else {
1438                         fprintf(stderr, "Created configuration file %s.\n", filename);
1439                 }
1440         }
1441
1442         char *tmpfile = NULL;
1443         FILE *tf = NULL;
1444
1445         if(action >= -1) {
1446                 xasprintf(&tmpfile, "%s.config.tmp", filename);
1447                 tf = fopen(tmpfile, "w");
1448                 if(!tf) {
1449                         fprintf(stderr, "Could not open temporary file %s: %s\n", tmpfile, strerror(errno));
1450                         fclose(f);
1451                         return 1;
1452                 }
1453         }
1454
1455         // Copy the file, making modifications on the fly, unless we are just getting a value.
1456         char buf1[4096];
1457         char buf2[4096];
1458         bool set = false;
1459         bool removed = false;
1460         found = false;
1461
1462         while(fgets(buf1, sizeof buf1, f)) {
1463                 buf1[sizeof buf1 - 1] = 0;
1464                 strncpy(buf2, buf1, sizeof buf2);
1465
1466                 // Parse line in a simple way
1467                 char *bvalue;
1468                 int len;
1469
1470                 len = strcspn(buf2, "\t =");
1471                 bvalue = buf2 + len;
1472                 bvalue += strspn(bvalue, "\t ");
1473                 if(*bvalue == '=') {
1474                         bvalue++;
1475                         bvalue += strspn(bvalue, "\t ");
1476                 }
1477                 rstrip(bvalue);
1478                 buf2[len] = '\0';
1479
1480                 // Did it match?
1481                 if(!strcasecmp(buf2, variable)) {
1482                         // Get
1483                         if(action < -1) {
1484                                 found = true;
1485                                 printf("%s\n", bvalue);
1486                         // Del
1487                         } else if(action == -1) {
1488                                 if(!*value || !strcasecmp(bvalue, value)) {
1489                                         removed = true;
1490                                         continue;
1491                                 }
1492                         // Set
1493                         } else if(action == 0) {
1494                                 // Already set? Delete the rest...
1495                                 if(set)
1496                                         continue;
1497                                 // Otherwise, replace.
1498                                 if(fprintf(tf, "%s = %s\n", variable, value) < 0) {
1499                                         fprintf(stderr, "Error writing to temporary file %s: %s\n", tmpfile, strerror(errno));
1500                                         return 1;
1501                                 }
1502                                 set = true;
1503                                 continue;
1504                         }
1505                 }
1506
1507                 if(action >= -1) {
1508                         // Copy original line...
1509                         if(fputs(buf1, tf) < 0) {
1510                                 fprintf(stderr, "Error writing to temporary file %s: %s\n", tmpfile, strerror(errno));
1511                                 return 1;
1512                         }
1513
1514                         // Add newline if it is missing...
1515                         if(*buf1 && buf1[strlen(buf1) - 1] != '\n') {
1516                                 if(fputc('\n', tf) < 0) {
1517                                         fprintf(stderr, "Error writing to temporary file %s: %s\n", tmpfile, strerror(errno));
1518                                         return 1;
1519                                 }
1520                         }
1521                 }
1522         }
1523
1524         // Make sure we read everything...
1525         if(ferror(f) || !feof(f)) {
1526                 fprintf(stderr, "Error while reading from configuration file %s: %s\n", filename, strerror(errno));
1527                 return 1;
1528         }
1529
1530         if(fclose(f)) {
1531                 fprintf(stderr, "Error closing configuration file %s: %s\n", filename, strerror(errno));
1532                 return 1;
1533         }
1534
1535         // Add new variable if necessary.
1536         if(action > 0 || (action == 0 && !set)) {
1537                 if(fprintf(tf, "%s = %s\n", variable, value) < 0) {
1538                         fprintf(stderr, "Error writing to temporary file %s: %s\n", tmpfile, strerror(errno));
1539                         return 1;
1540                 }
1541         }
1542
1543         if(action < -1) {
1544                 if(!found)
1545                         fprintf(stderr, "No matching configuration variables found.\n");
1546                 return 0;
1547         }
1548
1549         // Make sure we wrote everything...
1550         if(fclose(tf)) {
1551                 fprintf(stderr, "Error closing temporary file %s: %s\n", tmpfile, strerror(errno));
1552                 return 1;
1553         }
1554
1555         // Could we find what we had to remove?
1556         if(action < 0 && !removed) {
1557                 remove(tmpfile);
1558                 fprintf(stderr, "No configuration variables deleted.\n");
1559                 return *value;
1560         }
1561
1562         // Replace the configuration file with the new one
1563 #ifdef HAVE_MINGW
1564         if(remove(filename)) {
1565                 fprintf(stderr, "Error replacing file %s: %s\n", filename, strerror(errno));
1566                 return 1;
1567         }
1568 #endif
1569         if(rename(tmpfile, filename)) {
1570                 fprintf(stderr, "Error renaming temporary file %s to configuration file %s: %s\n", tmpfile, filename, strerror(errno));
1571                 return 1;
1572         }
1573
1574         // Silently try notifying a running tincd of changes.
1575         if(connect_tincd(false))
1576                 sendline(fd, "%d %d", CONTROL, REQ_RELOAD);
1577
1578         return 0;
1579 }
1580
1581 bool check_id(const char *name) {
1582         if(!name || !*name)
1583                 return false;
1584
1585         for(int i = 0; i < strlen(name); i++) {
1586                 if(!isalnum(name[i]) && name[i] != '_')
1587                         return false;
1588         }
1589
1590         return true;
1591 }
1592
1593 static int cmd_init(int argc, char *argv[]) {
1594         if(!access(tinc_conf, F_OK)) {
1595                 fprintf(stderr, "Configuration file %s already exists!\n", tinc_conf);
1596                 return 1;
1597         }
1598
1599         if(argc < 2) {
1600                 if(tty) {
1601                         char buf[1024];
1602                         fprintf(stdout, "Enter the Name you want your tinc node to have: ");
1603                         fflush(stdout);
1604                         if(!fgets(buf, sizeof buf, stdin)) {
1605                                 fprintf(stderr, "Error while reading stdin: %s\n", strerror(errno));
1606                                 return 1;
1607                         }
1608                         int len = rstrip(buf);
1609                         if(!len) {
1610                                 fprintf(stderr, "No name given!\n");
1611                                 return 1;
1612                         }
1613                         name = strdup(buf);
1614                 } else {
1615                         fprintf(stderr, "No Name given!\n");
1616                         return 1;
1617                 }
1618         } else {
1619                 name = strdup(argv[1]);
1620                 if(!*name) {
1621                         fprintf(stderr, "No Name given!\n");
1622                         return 1;
1623                 }
1624         }
1625
1626         if(!check_id(name)) {
1627                 fprintf(stderr, "Invalid Name! Only a-z, A-Z, 0-9 and _ are allowed characters.\n");
1628                 return 1;
1629         }
1630
1631         if(mkdir(confdir, 0755) && errno != EEXIST) {
1632                 fprintf(stderr, "Could not create directory %s: %s\n", CONFDIR, strerror(errno));
1633                 return 1;
1634         }
1635
1636         if(mkdir(confbase, 0755) && errno != EEXIST) {
1637                 fprintf(stderr, "Could not create directory %s: %s\n", confbase, strerror(errno));
1638                 return 1;
1639         }
1640
1641         if(mkdir(hosts_dir, 0755) && errno != EEXIST) {
1642                 fprintf(stderr, "Could not create directory %s: %s\n", hosts_dir, strerror(errno));
1643                 return 1;
1644         }
1645
1646         FILE *f = fopen(tinc_conf, "w");
1647         if(!f) {
1648                 fprintf(stderr, "Could not create file %s: %s\n", tinc_conf, strerror(errno));
1649                 return 1;
1650         }
1651
1652         fprintf(f, "Name = %s\n", name);
1653         fclose(f);
1654
1655         if(!rsa_keygen(2048, false) || !ecdsa_keygen(false))
1656                 return 1;
1657
1658 #ifndef HAVE_MINGW
1659         char *filename;
1660         xasprintf(&filename, "%s" SLASH "tinc-up", confbase);
1661         if(access(filename, F_OK)) {
1662                 FILE *f = fopen(filename, "w");
1663                 if(!f) {
1664                         fprintf(stderr, "Could not create file %s: %s\n", filename, strerror(errno));
1665                         return 1;
1666                 }
1667                 fchmod(fileno(f), 0755);
1668                 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");
1669                 fclose(f);
1670         }
1671 #endif
1672
1673         return 0;
1674
1675 }
1676
1677 static int cmd_generate_keys(int argc, char *argv[]) {
1678         return !(rsa_keygen(argc > 1 ? atoi(argv[1]) : 2048, true) && ecdsa_keygen(true));
1679 }
1680
1681 static int cmd_generate_rsa_keys(int argc, char *argv[]) {
1682         return !rsa_keygen(argc > 1 ? atoi(argv[1]) : 2048, true);
1683 }
1684
1685 static int cmd_generate_ecdsa_keys(int argc, char *argv[]) {
1686         return !ecdsa_keygen(true);
1687 }
1688
1689 static int cmd_help(int argc, char *argv[]) {
1690         usage(false);
1691         return 0;
1692 }
1693
1694 static int cmd_version(int argc, char *argv[]) {
1695         version();
1696         return 0;
1697 }
1698
1699 static int cmd_info(int argc, char *argv[]) {
1700         if(argc != 2) {
1701                 fprintf(stderr, "Invalid number of arguments.\n");
1702                 return 1;
1703         }
1704
1705         if(!connect_tincd(true))
1706                 return 1;
1707
1708         return info(fd, argv[1]);
1709 }
1710
1711 static const char *conffiles[] = {
1712         "tinc.conf",
1713         "tinc-up",
1714         "tinc-down",
1715         "subnet-up",
1716         "subnet-down",
1717         "host-up",
1718         "host-down",
1719         NULL,
1720 };
1721
1722 static int cmd_edit(int argc, char *argv[]) {
1723         if(argc != 2) {
1724                 fprintf(stderr, "Invalid number of arguments.\n");
1725                 return 1;
1726         }
1727
1728         char *filename = NULL;
1729
1730         if(strncmp(argv[1], "hosts" SLASH, 6)) {
1731                 for(int i = 0; conffiles[i]; i++) {
1732                         if(!strcmp(argv[1], conffiles[i])) {
1733                                 xasprintf(&filename, "%s" SLASH "%s", confbase, argv[1]);
1734                                 break;
1735                         }
1736                 }
1737         } else {
1738                 argv[1] += 6;
1739         }
1740
1741         if(!filename) {
1742                 xasprintf(&filename, "%s" SLASH "%s", hosts_dir, argv[1]);
1743                 char *dash = strchr(argv[1], '-');
1744                 if(dash) {
1745                         *dash++ = 0;
1746                         if((strcmp(dash, "up") && strcmp(dash, "down")) || !check_id(argv[1])) {
1747                                 fprintf(stderr, "Invalid configuration filename.\n");
1748                                 return 1;
1749                         }
1750                 }
1751         }
1752
1753         char *command;
1754 #ifndef HAVE_MINGW
1755         xasprintf(&command, "\"%s\" \"%s\"", getenv("VISUAL") ?: getenv("EDITOR") ?: "vi", filename);
1756 #else
1757         xasprintf(&command, "edit \"%s\"", filename);
1758 #endif
1759         int result = system(command);
1760         if(result)
1761                 return result;
1762
1763         // Silently try notifying a running tincd of changes.
1764         if(connect_tincd(false))
1765                 sendline(fd, "%d %d", CONTROL, REQ_RELOAD);
1766
1767         return 0;
1768 }
1769
1770 static int export(const char *name, FILE *out) {
1771         char *filename;
1772         xasprintf(&filename, "%s" SLASH "%s", hosts_dir, name);
1773         FILE *in = fopen(filename, "r");
1774         if(!in) {
1775                 fprintf(stderr, "Could not open configuration file %s: %s\n", filename, strerror(errno));
1776                 return 1;
1777         }
1778
1779         fprintf(out, "Name = %s\n", name);
1780         char buf[4096];
1781         while(fgets(buf, sizeof buf, in)) {
1782                 if(strcspn(buf, "\t =") != 4 || strncasecmp(buf, "Name", 4))
1783                         fputs(buf, out);
1784         }
1785
1786         if(ferror(in)) {
1787                 fprintf(stderr, "Error while reading configuration file %s: %s\n", filename, strerror(errno));
1788                 fclose(in);
1789                 return 1;
1790         }
1791
1792         fclose(in);
1793         return 0;
1794 }
1795
1796 static int cmd_export(int argc, char *argv[]) {
1797         char *name = get_my_name();
1798         if(!name)
1799                 return 1;
1800
1801         return export(name, stdout);
1802 }
1803
1804 static int cmd_export_all(int argc, char *argv[]) {
1805         DIR *dir = opendir(hosts_dir);
1806         if(!dir) {
1807                 fprintf(stderr, "Could not open host configuration directory %s: %s\n", hosts_dir, strerror(errno));
1808                 return 1;
1809         }
1810
1811         bool first = true;
1812         int result = 0;
1813         struct dirent *ent;
1814
1815         while((ent = readdir(dir))) {
1816                 if(!check_id(ent->d_name))
1817                         continue;
1818
1819                 if(first)
1820                         first = false;
1821                 else
1822                         printf("#---------------------------------------------------------------#\n");
1823
1824                 result |= export(ent->d_name, stdout);
1825         }
1826
1827         closedir(dir);
1828         return result;
1829 }
1830
1831 static int cmd_import(int argc, char *argv[]) {
1832         FILE *in = stdin;
1833         FILE *out = NULL;
1834
1835         char buf[4096];
1836         char name[4096];
1837         char *filename;
1838         int count = 0;
1839         bool firstline = true;
1840
1841         while(fgets(buf, sizeof buf, in)) {
1842                 if(sscanf(buf, "Name = %s", name) == 1) {
1843                         if(!check_id(name)) {
1844                                 fprintf(stderr, "Invalid Name in input!\n");
1845                                 return 1;
1846                         }
1847
1848                         if(out)
1849                                 fclose(out);
1850
1851                         free(filename);
1852                         xasprintf(&filename, "%s" SLASH "%s", hosts_dir, name);
1853
1854                         if(!force && !access(filename, F_OK)) {
1855                                 fprintf(stderr, "Host configuration file %s already exists, skipping.\n", filename);
1856                                 out = NULL;
1857                                 continue;
1858                         }
1859
1860                         out = fopen(filename, "w");
1861                         if(!out) {
1862                                 fprintf(stderr, "Error creating configuration file %s: %s\n", filename, strerror(errno));
1863                                 return 1;
1864                         }
1865
1866                         count++;
1867                         firstline = false;
1868                         continue;
1869                 } else if(firstline) {
1870                         fprintf(stderr, "Junk at the beginning of the input, ignoring.\n");
1871                         firstline = false;
1872                 }
1873
1874
1875                 if(!strcmp(buf, "#---------------------------------------------------------------#\n"))
1876                         continue;
1877
1878                 if(out) {
1879                         if(fputs(buf, out) < 0) {
1880                                 fprintf(stderr, "Error writing to host configuration file %s: %s\n", filename, strerror(errno));
1881                                 return 1;
1882                         }
1883                 }
1884         }
1885
1886         if(out)
1887                 fclose(out);
1888
1889         if(count) {
1890                 fprintf(stderr, "Imported %d host configuration files.\n", count);
1891                 return 0;
1892         } else {
1893                 fprintf(stderr, "No host configuration files imported.\n");
1894                 return 1;
1895         }
1896 }
1897
1898 static const struct {
1899         const char *command;
1900         int (*function)(int argc, char *argv[]);
1901 } commands[] = {
1902         {"start", cmd_start},
1903         {"stop", cmd_stop},
1904         {"restart", cmd_restart},
1905         {"reload", cmd_reload},
1906         {"dump", cmd_dump},
1907         {"purge", cmd_purge},
1908         {"debug", cmd_debug},
1909         {"retry", cmd_retry},
1910         {"connect", cmd_connect},
1911         {"disconnect", cmd_disconnect},
1912         {"top", cmd_top},
1913         {"pcap", cmd_pcap},
1914         {"log", cmd_log},
1915         {"pid", cmd_pid},
1916         {"config", cmd_config},
1917         {"init", cmd_init},
1918         {"generate-keys", cmd_generate_keys},
1919         {"generate-rsa-keys", cmd_generate_rsa_keys},
1920         {"generate-ecdsa-keys", cmd_generate_ecdsa_keys},
1921         {"help", cmd_help},
1922         {"version", cmd_version},
1923         {"info", cmd_info},
1924         {"edit", cmd_edit},
1925         {"export", cmd_export},
1926         {"export-all", cmd_export_all},
1927         {"import", cmd_import},
1928         {NULL, NULL},
1929 };
1930
1931 #ifdef HAVE_READLINE
1932 static char *complete_command(const char *text, int state) {
1933         static int i;
1934
1935         if(!state)
1936                 i = 0;
1937         else
1938                 i++;
1939
1940         while(commands[i].command) {
1941                 if(!strncasecmp(commands[i].command, text, strlen(text)))
1942                         return xstrdup(commands[i].command);
1943                 i++;
1944         }
1945
1946         return NULL;
1947 }
1948
1949 static char *complete_dump(const char *text, int state) {
1950         const char *matches[] = {"nodes", "edges", "subnets", "connections", "graph", NULL};
1951         static int i;
1952
1953         if(!state)
1954                 i = 0;
1955         else
1956                 i++;
1957
1958         while(matches[i]) {
1959                 if(!strncasecmp(matches[i], text, strlen(text)))
1960                         return xstrdup(matches[i]);
1961                 i++;
1962         }
1963
1964         return NULL;
1965 }
1966
1967 static char *complete_config(const char *text, int state) {
1968         const char *sub[] = {"get", "set", "add", "del"};
1969         static int i;
1970         if(!state) {
1971                 i = 0;
1972                 if(!strchr(rl_line_buffer + 7, ' '))
1973                         i = -4;
1974                 else {
1975                         bool found = false;
1976                         for(int i = 0; i < 4; i++) {
1977                                 if(!strncasecmp(rl_line_buffer + 7, sub[i], strlen(sub[i])) && rl_line_buffer[7 + strlen(sub[i])] == ' ') {
1978                                         found = true;
1979                                         break;
1980                                 }
1981                         }
1982                         if(!found)
1983                                 return NULL;
1984                 }
1985         } else {
1986                 i++;
1987         }
1988
1989         while(i < 0 || variables[i].name) {
1990                 if(i < 0 && !strncasecmp(sub[i + 4], text, strlen(text)))
1991                         return xstrdup(sub[i + 4]);
1992                 if(i >= 0) {
1993                         char *dot = strchr(text, '.');
1994                         if(dot) {
1995                                 if((variables[i].type & VAR_HOST) && !strncasecmp(variables[i].name, dot + 1, strlen(dot + 1))) {
1996                                         char *match;
1997                                         xasprintf(&match, "%.*s.%s", dot - text, text, variables[i].name);
1998                                         return match;
1999                                 }
2000                         } else {
2001                                 if(!strncasecmp(variables[i].name, text, strlen(text)))
2002                                         return xstrdup(variables[i].name);
2003                         }
2004                 }
2005                 i++;
2006         }
2007
2008         return NULL;
2009 }
2010
2011 static char *complete_info(const char *text, int state) {
2012         static int i;
2013         if(!state) {
2014                 i = 0;
2015                 if(!connect_tincd(false))
2016                         return NULL;
2017                 // Check the list of nodes
2018                 sendline(fd, "%d %d", CONTROL, REQ_DUMP_NODES);
2019                 sendline(fd, "%d %d", CONTROL, REQ_DUMP_SUBNETS);
2020         }
2021
2022         while(recvline(fd, line, sizeof line)) {
2023                 char item[4096];
2024                 int n = sscanf(line, "%d %d %s", &code, &req, item);
2025                 if(n == 2) {
2026                         i++;
2027                         if(i >= 2)
2028                                 break;
2029                         else
2030                                 continue;
2031                 }
2032
2033                 if(n != 3) {
2034                         fprintf(stderr, "Unable to parse dump from tincd, n = %d, i = %d.\n", n, i);
2035                         break;
2036                 }
2037
2038                 if(!strncmp(item, text, strlen(text)))
2039                         return xstrdup(strip_weight(item));
2040         }
2041
2042         return NULL;
2043 }
2044
2045 static char *complete_nothing(const char *text, int state) {
2046         return NULL;
2047 }
2048
2049 static char **completion (const char *text, int start, int end) {
2050         char **matches = NULL;
2051
2052         if(!start)
2053                 matches = rl_completion_matches(text, complete_command);
2054         else if(!strncasecmp(rl_line_buffer, "dump ", 5))
2055                 matches = rl_completion_matches(text, complete_dump);
2056         else if(!strncasecmp(rl_line_buffer, "config ", 7))
2057                 matches = rl_completion_matches(text, complete_config);
2058         else if(!strncasecmp(rl_line_buffer, "info ", 5))
2059                 matches = rl_completion_matches(text, complete_info);
2060
2061         return matches;
2062 }
2063 #endif
2064
2065 static int cmd_shell(int argc, char *argv[]) {
2066         char *prompt;
2067         xasprintf(&prompt, "%s> ", identname);
2068         int result = 0;
2069         char buf[4096];
2070         char *line = NULL;
2071         int maxargs = argc + 16;
2072         char **nargv = xmalloc(maxargs * sizeof *nargv);
2073
2074         for(int i = 0; i < argc; i++)
2075                 nargv[i] = argv[i];
2076
2077 #ifdef HAVE_READLINE
2078         rl_readline_name = "tinc";
2079         rl_completion_entry_function = complete_nothing;
2080         rl_attempted_completion_function = completion;
2081         rl_filename_completion_desired = 0;
2082         char *copy = NULL;
2083 #endif
2084
2085         while(true) {
2086 #ifdef HAVE_READLINE
2087                 if(tty) {
2088                         free(copy);
2089                         free(line);
2090                         rl_basic_word_break_characters = "\t\n ";
2091                         line = readline(prompt);
2092                         if(line)
2093                                 copy = xstrdup(line);
2094                 } else {
2095                         line = fgets(buf, sizeof buf, stdin);
2096                 }
2097 #else
2098                 if(tty)
2099                         fputs(prompt, stdout);
2100
2101                 line = fgets(buf, sizeof buf, stdin);
2102 #endif
2103
2104                 if(!line)
2105                         break;
2106
2107                 /* Ignore comments */
2108
2109                 if(*line == '#')
2110                         continue;
2111
2112                 /* Split */
2113
2114                 int nargc = argc;
2115                 char *p = line + strspn(line, " \t\n");
2116                 char *next = strtok(p, " \t\n");
2117
2118                 while(p && *p) {
2119                         if(nargc >= maxargs) {
2120                                 fprintf(stderr, "next %p '%s', p %p '%s'\n", next, next, p, p);
2121                                 abort();
2122                                 maxargs *= 2;
2123                                 nargv = xrealloc(nargv, maxargs * sizeof *nargv);
2124                         }
2125
2126                         nargv[nargc++] = p;
2127                         p = next;
2128                         next = strtok(NULL, " \t\n");
2129                 }
2130
2131                 if(nargc == argc)
2132                         continue;
2133
2134                 if(!strcasecmp(nargv[argc], "exit") || !strcasecmp(nargv[argc], "quit"))
2135                         return result;
2136
2137                 bool found = false;
2138
2139                 for(int i = 0; commands[i].command; i++) {
2140                         if(!strcasecmp(nargv[argc], commands[i].command)) {
2141                                 result |= commands[i].function(nargc - argc - 1, nargv + argc + 1);
2142                                 found = true;
2143                                 break;
2144                         }
2145                 }
2146
2147 #ifdef HAVE_READLINE
2148                 if(tty && found)
2149                         add_history(copy);
2150 #endif
2151
2152                 if(!found) {
2153                         fprintf(stderr, "Unknown command `%s'.\n", nargv[argc]);
2154                         result |= 1;
2155                 }
2156         }
2157
2158         free(nargv);
2159
2160         if(tty)
2161                 printf("\n");
2162         return result;
2163 }
2164
2165
2166 int main(int argc, char *argv[]) {
2167         program_name = argv[0];
2168         orig_argv = argv;
2169         orig_argc = argc;
2170
2171         if(!parse_options(argc, argv))
2172                 return 1;
2173
2174         make_names();
2175
2176         if(show_version) {
2177                 version();
2178                 return 0;
2179         }
2180
2181         if(show_help) {
2182                 usage(false);
2183                 return 0;
2184         }
2185
2186         tty = isatty(0) && isatty(1);
2187
2188         if(optind >= argc)
2189                 return cmd_shell(argc, argv);
2190
2191         for(int i = 0; commands[i].command; i++) {
2192                 if(!strcasecmp(argv[optind], commands[i].command))
2193                         return commands[i].function(argc - optind, argv + optind);
2194         }
2195
2196         fprintf(stderr, "Unknown command `%s'.\n", argv[optind]);
2197         usage(true);
2198         return 1;
2199 }