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