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((orig_argc + argc) * sizeof *nargv);
 821
 822         for(int i = 0; i < orig_argc; i++)
 823                 nargv[nargc++] = orig_argv[i];
 824         for(int i = 1; i < argc; i++)
 825                 nargv[nargc++] = argv[i];
 826
 827 #ifdef HAVE_MINGW
 828         execvp(c, nargv);
 829         fprintf(stderr, "Error starting %s: %s\n", c, strerror(errno));
 830         return 1;
 831 #else
 832         pid_t pid = fork();
 833         if(pid == -1) {
 834                 fprintf(stderr, "Could not fork: %s\n", strerror(errno));
 835                 return 1;
 836         }
 837
 838         if(!pid)
 839                 exit(execvp(c, nargv));
 840
 841         int status = -1;
 842         if(waitpid(pid, &status, 0) != pid || !WIFEXITED(status) || WEXITSTATUS(status)) {
 843                 fprintf(stderr, "Error starting %s\n", c);
 844                 return 1;
 845         }
 846
 847         return 0;
 848 #endif
 849 }
 850
 851 static int cmd_stop(int argc, char *argv[]) {
 852 #ifndef HAVE_MINGW
 853         if(!connect_tincd(true)) {
 854                 if(pid) {
 855                         if(kill(pid, SIGTERM))
 856                                 return 1;
 857                         fprintf(stderr, "Sent TERM signal to process with PID %u.\n", pid);
 858                         return 0;
 859                 }
 860
 861                 return 1;
 862         }
 863
 864         sendline(fd, "%d %d", CONTROL, REQ_STOP);
 865         if(!recvline(fd, line, sizeof line) || sscanf(line, "%d %d %d", &code, &req, &result) != 3 || code != CONTROL || req != REQ_STOP || result) {
 866                 fprintf(stderr, "Could not stop tinc daemon.\n");
 867                 return 1;
 868         }
 869 #else
 870         if(!remove_service())
 871                 return 1;
 872 #endif
 873         close(fd);
 874         pid = 0;
 875         fd = -1;
 876
 877         return 0;
 878 }
 879
 880 static int cmd_restart(int argc, char *argv[]) {
 881         cmd_stop(argc, argv);
 882         return cmd_start(argc, argv);
 883 }
 884
 885 static int cmd_reload(int argc, char *argv[]) {
 886         if(!connect_tincd(true))
 887                 return 1;
 888
 889         sendline(fd, "%d %d", CONTROL, REQ_RELOAD);
 890         if(!recvline(fd, line, sizeof line) || sscanf(line, "%d %d %d", &code, &req, &result) != 3 || code != CONTROL || req != REQ_RELOAD || result) {
 891                 fprintf(stderr, "Could not reload configuration.\n");
 892                 return 1;
 893         }
 894
 895         return 0;
 896
 897 }
 898
 899 static int cmd_dump(int argc, char *argv[]) {
 900         if(argc != 2) {
 901                 fprintf(stderr, "Invalid number of arguments.\n");
 902                 usage(true);
 903                 return 1;
 904         }
 905
 906         if(!connect_tincd(true))
 907                 return 1;
 908
 909         int do_graph = 0;
 910
 911         if(!strcasecmp(argv[1], "nodes"))
 912                 sendline(fd, "%d %d", CONTROL, REQ_DUMP_NODES);
 913         else if(!strcasecmp(argv[1], "edges"))
 914                 sendline(fd, "%d %d", CONTROL, REQ_DUMP_EDGES);
 915         else if(!strcasecmp(argv[1], "subnets"))
 916                 sendline(fd, "%d %d", CONTROL, REQ_DUMP_SUBNETS);
 917         else if(!strcasecmp(argv[1], "connections"))
 918                 sendline(fd, "%d %d", CONTROL, REQ_DUMP_CONNECTIONS);
 919         else if(!strcasecmp(argv[1], "graph")) {
 920                 sendline(fd, "%d %d", CONTROL, REQ_DUMP_NODES);
 921                 sendline(fd, "%d %d", CONTROL, REQ_DUMP_EDGES);
 922                 do_graph = 1;
 923         } else if(!strcasecmp(argv[1], "digraph")) {
 924                 sendline(fd, "%d %d", CONTROL, REQ_DUMP_NODES);
 925                 sendline(fd, "%d %d", CONTROL, REQ_DUMP_EDGES);
 926                 do_graph = 2;
 927         } else {
 928                 fprintf(stderr, "Unknown dump type '%s'.\n", argv[1]);
 929                 usage(true);
 930                 return 1;
 931         }
 932
 933         if(do_graph == 1)
 934                 printf("graph {\n");
 935         else if(do_graph == 2)
 936                 printf("digraph {\n");
 937
 938         while(recvline(fd, line, sizeof line)) {
 939                 char node1[4096], node2[4096];
 940                 int n = sscanf(line, "%d %d %s %s", &code, &req, node1, node2);
 941                 if(n == 2) {
 942                         if(do_graph && req == REQ_DUMP_NODES)
 943                                 continue;
 944                         else {
 945                                 if(do_graph)
 946                                         printf("}\n");
 947                                 return 0;
 948                         }
 949                 }
 950                 if(n < 2)
 951                         break;
 952
 953                 if(!do_graph) {
 954                         char node[4096];
 955                         char from[4096];
 956                         char to[4096];
 957                         char subnet[4096];
 958                         char host[4096];
 959                         char port[4096];
 960                         char via[4096];
 961                         char nexthop[4096];
 962                         int cipher, digest, maclength, compression, distance, socket, weight;
 963                         short int pmtu, minmtu, maxmtu;
 964                         unsigned int options, status;
 965                         long int last_state_change;
 966
 967                         switch(req) {
 968                                 case REQ_DUMP_NODES: {
 969                                         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);
 970                                         if(n != 16) {
 971                                                 fprintf(stderr, "Unable to parse node dump from tincd: %s\n", line);
 972                                                 return 1;
 973                                         }
 974                                         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",
 975                                                         node, host, port, cipher, digest, maclength, compression, options, status, nexthop, via, distance, pmtu, minmtu, maxmtu);
 976                                 } break;
 977
 978                                 case REQ_DUMP_EDGES: {
 979                                         int n = sscanf(line, "%*d %*d %s %s %s port %s %x %d", from, to, host, port, &options, &weight);
 980                                         if(n != 6) {
 981                                                 fprintf(stderr, "Unable to parse edge dump from tincd.\n");
 982                                                 return 1;
 983                                         }
 984                                         printf("%s to %s at %s port %s options %x weight %d\n", from, to, host, port, options, weight);
 985                                 } break;
 986
 987                                 case REQ_DUMP_SUBNETS: {
 988                                         int n = sscanf(line, "%*d %*d %s %s", subnet, node);
 989                                         if(n != 2) {
 990                                                 fprintf(stderr, "Unable to parse subnet dump from tincd.\n");
 991                                                 return 1;
 992                                         }
 993                                         printf("%s owner %s\n", strip_weight(subnet), node);
 994                                 } break;
 995
 996                                 case REQ_DUMP_CONNECTIONS: {
 997                                         int n = sscanf(line, "%*d %*d %s %s port %s %x %d %x", node, host, port, &options, &socket, &status);
 998                                         if(n != 6) {
 999                                                 fprintf(stderr, "Unable to parse connection dump from tincd.\n");
1000                                                 return 1;
1001                                         }
1002                                         printf("%s at %s port %s options %x socket %d status %x\n", node, host, port, options, socket, status);
1003                                 } break;
1004
1005                                 default:
1006                                         fprintf(stderr, "Unable to parse dump from tincd.\n");
1007                                         return 1;
1008                         }
1009                 } else {
1010                         if(req == REQ_DUMP_NODES)
1011                                 printf(" %s [label = \"%s\"];\n", node1, node1);
1012                         else {
1013                                 if(do_graph == 1 && strcmp(node1, node2) > 0)
1014                                         printf(" %s -- %s;\n", node1, node2);
1015                                 else if(do_graph == 2)
1016                                         printf(" %s -> %s;\n", node1, node2);
1017                         }
1018                 }
1019         }
1020
1021         fprintf(stderr, "Error receiving dump.\n");
1022         return 1;
1023 }
1024
1025 static int cmd_purge(int argc, char *argv[]) {
1026         if(!connect_tincd(true))
1027                 return 1;
1028
1029         sendline(fd, "%d %d", CONTROL, REQ_PURGE);
1030         if(!recvline(fd, line, sizeof line) || sscanf(line, "%d %d %d", &code, &req, &result) != 3 || code != CONTROL || req != REQ_PURGE || result) {
1031                 fprintf(stderr, "Could not purge old information.\n");
1032                 return 1;
1033         }
1034
1035         return 0;
1036 }
1037
1038 static int cmd_debug(int argc, char *argv[]) {
1039         if(argc != 2) {
1040                 fprintf(stderr, "Invalid number of arguments.\n");
1041                 return 1;
1042         }
1043
1044         if(!connect_tincd(true))
1045                 return 1;
1046
1047         int debuglevel = atoi(argv[1]);
1048         int origlevel;
1049
1050         sendline(fd, "%d %d %d", CONTROL, REQ_SET_DEBUG, debuglevel);
1051         if(!recvline(fd, line, sizeof line) || sscanf(line, "%d %d %d", &code, &req, &origlevel) != 3 || code != CONTROL || req != REQ_SET_DEBUG) {
1052                 fprintf(stderr, "Could not set debug level.\n");
1053                 return 1;
1054         }
1055
1056         fprintf(stderr, "Old level %d, new level %d.\n", origlevel, debuglevel);
1057         return 0;
1058 }
1059
1060 static int cmd_retry(int argc, char *argv[]) {
1061         if(!connect_tincd(true))
1062                 return 1;
1063
1064         sendline(fd, "%d %d", CONTROL, REQ_RETRY);
1065         if(!recvline(fd, line, sizeof line) || sscanf(line, "%d %d %d", &code, &req, &result) != 3 || code != CONTROL || req != REQ_RETRY || result) {
1066                 fprintf(stderr, "Could not retry outgoing connections.\n");
1067                 return 1;
1068         }
1069
1070         return 0;
1071 }
1072
1073 static int cmd_connect(int argc, char *argv[]) {
1074         if(argc != 2) {
1075                 fprintf(stderr, "Invalid number of arguments.\n");
1076                 return 1;
1077         }
1078
1079         if(!check_id(argv[1])) {
1080                 fprintf(stderr, "Invalid name for node.\n");
1081                 return 1;
1082         }
1083
1084         if(!connect_tincd(true))
1085                 return 1;
1086
1087         sendline(fd, "%d %d %s", CONTROL, REQ_CONNECT, argv[1]);
1088         if(!recvline(fd, line, sizeof line) || sscanf(line, "%d %d %d", &code, &req, &result) != 3 || code != CONTROL || req != REQ_CONNECT || result) {
1089                 fprintf(stderr, "Could not connect to %s.\n", argv[1]);
1090                 return 1;
1091         }
1092
1093         return 0;
1094 }
1095
1096 static int cmd_disconnect(int argc, char *argv[]) {
1097         if(argc != 2) {
1098                 fprintf(stderr, "Invalid number of arguments.\n");
1099                 return 1;
1100         }
1101
1102         if(!check_id(argv[1])) {
1103                 fprintf(stderr, "Invalid name for node.\n");
1104                 return 1;
1105         }
1106
1107         if(!connect_tincd(true))
1108                 return 1;
1109
1110         sendline(fd, "%d %d %s", CONTROL, REQ_DISCONNECT, argv[1]);
1111         if(!recvline(fd, line, sizeof line) || sscanf(line, "%d %d %d", &code, &req, &result) != 3 || code != CONTROL || req != REQ_DISCONNECT || result) {
1112                 fprintf(stderr, "Could not disconnect %s.\n", argv[1]);
1113                 return 1;
1114         }
1115
1116         return 0;
1117 }
1118
1119 static int cmd_top(int argc, char *argv[]) {
1120 #ifdef HAVE_CURSES
1121         if(!connect_tincd(true))
1122                 return 1;
1123
1124         top(fd);
1125         return 0;
1126 #else
1127         fprintf(stderr, "This version of tincctl was compiled without support for the curses library.\n");
1128         return 1;
1129 #endif
1130 }
1131
1132 static int cmd_pcap(int argc, char *argv[]) {
1133         if(!connect_tincd(true))
1134                 return 1;
1135
1136         pcap(fd, stdout, argc > 1 ? atoi(argv[1]) : 0);
1137         return 0;
1138 }
1139
1140 static int cmd_log(int argc, char *argv[]) {
1141         if(!connect_tincd(true))
1142                 return 1;
1143
1144         logcontrol(fd, stdout, argc > 1 ? atoi(argv[1]) : -1);
1145         return 0;
1146 }
1147
1148 static int cmd_pid(int argc, char *argv[]) {
1149         if(!connect_tincd(true) && !pid)
1150                 return 1;
1151
1152         printf("%d\n", pid);
1153         return 0;
1154 }
1155
1156 static int rstrip(char *value) {
1157         int len = strlen(value);
1158         while(len && strchr("\t\r\n ", value[len - 1]))
1159                 value[--len] = 0;
1160         return len;
1161 }
1162
1163 static char *get_my_name() {
1164         FILE *f = fopen(tinc_conf, "r");
1165         if(!f) {
1166                 fprintf(stderr, "Could not open %s: %s\n", tinc_conf, strerror(errno));
1167                 return NULL;
1168         }
1169
1170         char buf[4096];
1171         char *value;
1172         while(fgets(buf, sizeof buf, f)) {
1173                 int len = strcspn(buf, "\t =");
1174                 value = buf + len;
1175                 value += strspn(value, "\t ");
1176                 if(*value == '=') {
1177                         value++;
1178                         value += strspn(value, "\t ");
1179                 }
1180                 if(!rstrip(value))
1181                         continue;
1182                 buf[len] = 0;
1183                 if(strcasecmp(buf, "Name"))
1184                         continue;
1185                 if(*value) {
1186                         fclose(f);
1187                         return strdup(value);
1188                 }
1189         }
1190
1191         fclose(f);
1192         fprintf(stderr, "Could not find Name in %s.\n", tinc_conf);
1193         return NULL;
1194 }
1195
1196 #define VAR_SERVER 1    /* Should be in tinc.conf */
1197 #define VAR_HOST 2      /* Can be in host config file */
1198 #define VAR_MULTIPLE 4  /* Multiple statements allowed */
1199 #define VAR_OBSOLETE 8  /* Should not be used anymore */
1200
1201 static struct {
1202         const char *name;
1203         int type;
1204 } const variables[] = {
1205         /* Server configuration */
1206         {"AddressFamily", VAR_SERVER},
1207         {"BindToAddress", VAR_SERVER | VAR_MULTIPLE},
1208         {"BindToInterface", VAR_SERVER},
1209         {"Broadcast", VAR_SERVER},
1210         {"ConnectTo", VAR_SERVER | VAR_MULTIPLE},
1211         {"DecrementTTL", VAR_SERVER},
1212         {"Device", VAR_SERVER},
1213         {"DeviceType", VAR_SERVER},
1214         {"DirectOnly", VAR_SERVER},
1215         {"ECDSAPrivateKeyFile", VAR_SERVER},
1216         {"ExperimentalProtocol", VAR_SERVER},
1217         {"Forwarding", VAR_SERVER},
1218         {"GraphDumpFile", VAR_SERVER},
1219         {"Hostnames", VAR_SERVER},
1220         {"IffOneQueue", VAR_SERVER},
1221         {"Interface", VAR_SERVER},
1222         {"KeyExpire", VAR_SERVER},
1223         {"LocalDiscovery", VAR_SERVER},
1224         {"MACExpire", VAR_SERVER},
1225         {"MaxOutputBufferSize", VAR_SERVER},
1226         {"MaxTimeout", VAR_SERVER},
1227         {"Mode", VAR_SERVER},
1228         {"Name", VAR_SERVER},
1229         {"PingInterval", VAR_SERVER},
1230         {"PingTimeout", VAR_SERVER},
1231         {"PriorityInheritance", VAR_SERVER},
1232         {"PrivateKey", VAR_SERVER | VAR_OBSOLETE},
1233         {"PrivateKeyFile", VAR_SERVER},
1234         {"ProcessPriority", VAR_SERVER},
1235         {"Proxy", VAR_SERVER},
1236         {"ReplayWindow", VAR_SERVER},
1237         {"StrictSubnets", VAR_SERVER},
1238         {"TunnelServer", VAR_SERVER},
1239         {"UDPRcvBuf", VAR_SERVER},
1240         {"UDPSndBuf", VAR_SERVER},
1241         {"VDEGroup", VAR_SERVER},
1242         {"VDEPort", VAR_SERVER},
1243         /* Host configuration */
1244         {"Address", VAR_HOST | VAR_MULTIPLE},
1245         {"Cipher", VAR_SERVER | VAR_HOST},
1246         {"ClampMSS", VAR_SERVER | VAR_HOST},
1247         {"Compression", VAR_SERVER | VAR_HOST},
1248         {"Digest", VAR_SERVER | VAR_HOST},
1249         {"ECDSAPublicKey", VAR_HOST},
1250         {"ECDSAPublicKeyFile", VAR_SERVER | VAR_HOST},
1251         {"IndirectData", VAR_SERVER | VAR_HOST},
1252         {"MACLength", VAR_SERVER | VAR_HOST},
1253         {"PMTU", VAR_SERVER | VAR_HOST},
1254         {"PMTUDiscovery", VAR_SERVER | VAR_HOST},
1255         {"Port", VAR_HOST},
1256         {"PublicKey", VAR_HOST | VAR_OBSOLETE},
1257         {"PublicKeyFile", VAR_SERVER | VAR_HOST | VAR_OBSOLETE},
1258         {"Subnet", VAR_HOST | VAR_MULTIPLE},
1259         {"TCPOnly", VAR_SERVER | VAR_HOST},
1260         {"Weight", VAR_HOST},
1261         {NULL, 0}
1262 };
1263
1264 static int cmd_config(int argc, char *argv[]) {
1265         if(argc < 2) {
1266                 fprintf(stderr, "Invalid number of arguments.\n");
1267                 return 1;
1268         }
1269
1270         int action = -2;
1271         if(!strcasecmp(argv[1], "get")) {
1272                 argv++, argc--;
1273         } else if(!strcasecmp(argv[1], "add")) {
1274                 argv++, argc--, action = 1;
1275         } else if(!strcasecmp(argv[1], "del")) {
1276                 argv++, argc--, action = -1;
1277         } else if(!strcasecmp(argv[1], "replace") || !strcasecmp(argv[1], "set") || !strcasecmp(argv[1], "change")) {
1278                 argv++, argc--, action = 0;
1279         }
1280
1281         if(argc < 2) {
1282                 fprintf(stderr, "Invalid number of arguments.\n");
1283                 return 1;
1284         }
1285
1286         // Concatenate the rest of the command line
1287         strncpy(line, argv[1], sizeof line - 1);
1288         for(int i = 2; i < argc; i++) {
1289                 strncat(line, " ", sizeof line - 1 - strlen(line));
1290                 strncat(line, argv[i], sizeof line - 1 - strlen(line));
1291         }
1292
1293         // Liberal parsing into node name, variable name and value.
1294         char *node = NULL;
1295         char *variable;
1296         char *value;
1297         int len;
1298
1299         len = strcspn(line, "\t =");
1300         value = line + len;
1301         value += strspn(value, "\t ");
1302         if(*value == '=') {
1303                 value++;
1304                 value += strspn(value, "\t ");
1305         }
1306         line[len] = '\0';
1307         variable = strchr(line, '.');
1308         if(variable) {
1309                 node = line;
1310                 *variable++ = 0;
1311         } else {
1312                 variable = line;
1313         }
1314
1315         if(!*variable) {
1316                 fprintf(stderr, "No variable given.\n");
1317                 return 1;
1318         }
1319
1320         if(action >= 0 && !*value) {
1321                 fprintf(stderr, "No value for variable given.\n");
1322                 return 1;
1323         }
1324
1325         if(action < -1 && *value)
1326                 action = 0;
1327
1328         /* Some simple checks. */
1329         bool found = false;
1330
1331         for(int i = 0; variables[i].name; i++) {
1332                 if(strcasecmp(variables[i].name, variable))
1333                         continue;
1334
1335                 found = true;
1336                 variable = (char *)variables[i].name;
1337
1338                 /* Discourage use of obsolete variables. */
1339
1340                 if(variables[i].type & VAR_OBSOLETE && action >= 0) {
1341                         if(force) {
1342                                 fprintf(stderr, "Warning: %s is an obsolete variable!\n", variable);
1343                         } else {
1344                                 fprintf(stderr, "%s is an obsolete variable! Use --force to use it anyway.\n", variable);
1345                                 return 1;
1346                         }
1347                 }
1348
1349                 /* Don't put server variables in host config files */
1350
1351                 if(node && !(variables[i].type & VAR_HOST) && action >= 0) {
1352                         if(force) {
1353                                 fprintf(stderr, "Warning: %s is not a host configuration variable!\n", variable);
1354                         } else {
1355                                 fprintf(stderr, "%s is not a host configuration variable! Use --force to use it anyway.\n", variable);
1356                                 return 1;
1357                         }
1358                 }
1359
1360                 /* Should this go into our own host config file? */
1361
1362                 if(!node && !(variables[i].type & VAR_SERVER)) {
1363                         node = get_my_name();
1364                         if(!node)
1365                                 return 1;
1366                 }
1367
1368                 break;
1369         }
1370
1371         if(node && !check_id(node)) {
1372                 fprintf(stderr, "Invalid name for node.\n");
1373                 return 1;
1374         }
1375
1376         if(!found) {
1377                 if(force || action < 0) {
1378                         fprintf(stderr, "Warning: %s is not a known configuration variable!\n", variable);
1379                 } else {
1380                         fprintf(stderr, "%s: is not a known configuration variable! Use --force to use it anyway.\n", variable);
1381                         return 1;
1382                 }
1383         }
1384
1385         // Open the right configuration file.
1386         char *filename;
1387         if(node)
1388                 xasprintf(&filename, "%s" SLASH "%s", hosts_dir, node);
1389         else
1390                 filename = tinc_conf;
1391
1392         FILE *f = fopen(filename, "r");
1393         if(!f) {
1394                 if(action < 0 || errno != ENOENT) {
1395                         fprintf(stderr, "Could not open configuration file %s: %s\n", filename, strerror(errno));
1396                         return 1;
1397                 }
1398
1399                 // If it doesn't exist, create it.
1400                 f = fopen(filename, "a+");
1401                 if(!f) {
1402                         fprintf(stderr, "Could not create configuration file %s: %s\n", filename, strerror(errno));
1403                         return 1;
1404                 } else {
1405                         fprintf(stderr, "Created configuration file %s.\n", filename);
1406                 }
1407         }
1408
1409         char *tmpfile = NULL;
1410         FILE *tf = NULL;
1411
1412         if(action >= -1) {
1413                 xasprintf(&tmpfile, "%s.config.tmp", filename);
1414                 tf = fopen(tmpfile, "w");
1415                 if(!tf) {
1416                         fprintf(stderr, "Could not open temporary file %s: %s\n", tmpfile, strerror(errno));
1417                         fclose(f);
1418                         return 1;
1419                 }
1420         }
1421
1422         // Copy the file, making modifications on the fly, unless we are just getting a value.
1423         char buf1[4096];
1424         char buf2[4096];
1425         bool set = false;
1426         bool removed = false;
1427         found = false;
1428
1429         while(fgets(buf1, sizeof buf1, f)) {
1430                 buf1[sizeof buf1 - 1] = 0;
1431                 strncpy(buf2, buf1, sizeof buf2);
1432
1433                 // Parse line in a simple way
1434                 char *bvalue;
1435                 int len;
1436
1437                 len = strcspn(buf2, "\t =");
1438                 bvalue = buf2 + len;
1439                 bvalue += strspn(bvalue, "\t ");
1440                 if(*bvalue == '=') {
1441                         bvalue++;
1442                         bvalue += strspn(bvalue, "\t ");
1443                 }
1444                 rstrip(bvalue);
1445                 buf2[len] = '\0';
1446
1447                 // Did it match?
1448                 if(!strcasecmp(buf2, variable)) {
1449                         // Get
1450                         if(action < -1) {
1451                                 found = true;
1452                                 printf("%s\n", bvalue);
1453                         // Del
1454                         } else if(action == -1) {
1455                                 if(!*value || !strcasecmp(bvalue, value)) {
1456                                         removed = true;
1457                                         continue;
1458                                 }
1459                         // Set
1460                         } else if(action == 0) {
1461                                 // Already set? Delete the rest...
1462                                 if(set)
1463                                         continue;
1464                                 // Otherwise, replace.
1465                                 if(fprintf(tf, "%s = %s\n", variable, value) < 0) {
1466                                         fprintf(stderr, "Error writing to temporary file %s: %s\n", tmpfile, strerror(errno));
1467                                         return 1;
1468                                 }
1469                                 set = true;
1470                                 continue;
1471                         }
1472                 }
1473
1474                 if(action >= -1) {
1475                         // Copy original line...
1476                         if(fputs(buf1, tf) < 0) {
1477                                 fprintf(stderr, "Error writing to temporary file %s: %s\n", tmpfile, strerror(errno));
1478                                 return 1;
1479                         }
1480
1481                         // Add newline if it is missing...
1482                         if(*buf1 && buf1[strlen(buf1) - 1] != '\n') {
1483                                 if(fputc('\n', tf) < 0) {
1484                                         fprintf(stderr, "Error writing to temporary file %s: %s\n", tmpfile, strerror(errno));
1485                                         return 1;
1486                                 }
1487                         }
1488                 }
1489         }
1490
1491         // Make sure we read everything...
1492         if(ferror(f) || !feof(f)) {
1493                 fprintf(stderr, "Error while reading from configuration file %s: %s\n", filename, strerror(errno));
1494                 return 1;
1495         }
1496
1497         if(fclose(f)) {
1498                 fprintf(stderr, "Error closing configuration file %s: %s\n", filename, strerror(errno));
1499                 return 1;
1500         }
1501
1502         // Add new variable if necessary.
1503         if(action > 0 || (action == 0 && !set)) {
1504                 if(fprintf(tf, "%s = %s\n", variable, value) < 0) {
1505                         fprintf(stderr, "Error writing to temporary file %s: %s\n", tmpfile, strerror(errno));
1506                         return 1;
1507                 }
1508         }
1509
1510         if(action < -1) {
1511                 if(!found)
1512                         fprintf(stderr, "No matching configuration variables found.\n");
1513                 return 0;
1514         }
1515
1516         // Make sure we wrote everything...
1517         if(fclose(tf)) {
1518                 fprintf(stderr, "Error closing temporary file %s: %s\n", tmpfile, strerror(errno));
1519                 return 1;
1520         }
1521
1522         // Could we find what we had to remove?
1523         if(action < 0 && !removed) {
1524                 remove(tmpfile);
1525                 fprintf(stderr, "No configuration variables deleted.\n");
1526                 return *value;
1527         }
1528
1529         // Replace the configuration file with the new one
1530 #ifdef HAVE_MINGW
1531         if(remove(filename)) {
1532                 fprintf(stderr, "Error replacing file %s: %s\n", filename, strerror(errno));
1533                 return 1;
1534         }
1535 #endif
1536         if(rename(tmpfile, filename)) {
1537                 fprintf(stderr, "Error renaming temporary file %s to configuration file %s: %s\n", tmpfile, filename, strerror(errno));
1538                 return 1;
1539         }
1540
1541         // Silently try notifying a running tincd of changes.
1542         if(connect_tincd(false))
1543                 sendline(fd, "%d %d", CONTROL, REQ_RELOAD);
1544
1545         return 0;
1546 }
1547
1548 bool check_id(const char *name) {
1549         if(!name || !*name)
1550                 return false;
1551
1552         for(int i = 0; i < strlen(name); i++) {
1553                 if(!isalnum(name[i]) && name[i] != '_')
1554                         return false;
1555         }
1556
1557         return true;
1558 }
1559
1560 static int cmd_init(int argc, char *argv[]) {
1561         if(!access(tinc_conf, F_OK)) {
1562                 fprintf(stderr, "Configuration file %s already exists!\n", tinc_conf);
1563                 return 1;
1564         }
1565
1566         if(argc < 2) {
1567                 if(tty) {
1568                         char buf[1024];
1569                         fprintf(stdout, "Enter the Name you want your tinc node to have: ");
1570                         fflush(stdout);
1571                         if(!fgets(buf, sizeof buf, stdin)) {
1572                                 fprintf(stderr, "Error while reading stdin: %s\n", strerror(errno));
1573                                 return 1;
1574                         }
1575                         int len = rstrip(buf);
1576                         if(!len) {
1577                                 fprintf(stderr, "No name given!\n");
1578                                 return 1;
1579                         }
1580                         name = strdup(buf);
1581                 } else {
1582                         fprintf(stderr, "No Name given!\n");
1583                         return 1;
1584                 }
1585         } else {
1586                 name = strdup(argv[1]);
1587                 if(!*name) {
1588                         fprintf(stderr, "No Name given!\n");
1589                         return 1;
1590                 }
1591         }
1592
1593         if(!check_id(name)) {
1594                 fprintf(stderr, "Invalid Name! Only a-z, A-Z, 0-9 and _ are allowed characters.\n");
1595                 return 1;
1596         }
1597
1598         if(mkdir(confdir, 0755) && errno != EEXIST) {
1599                 fprintf(stderr, "Could not create directory %s: %s\n", CONFDIR, strerror(errno));
1600                 return 1;
1601         }
1602
1603         if(mkdir(confbase, 0755) && errno != EEXIST) {
1604                 fprintf(stderr, "Could not create directory %s: %s\n", confbase, strerror(errno));
1605                 return 1;
1606         }
1607
1608         if(mkdir(hosts_dir, 0755) && errno != EEXIST) {
1609                 fprintf(stderr, "Could not create directory %s: %s\n", hosts_dir, strerror(errno));
1610                 return 1;
1611         }
1612
1613         FILE *f = fopen(tinc_conf, "w");
1614         if(!f) {
1615                 fprintf(stderr, "Could not create file %s: %s\n", tinc_conf, strerror(errno));
1616                 return 1;
1617         }
1618
1619         fprintf(f, "Name = %s\n", name);
1620         fclose(f);
1621
1622         if(!rsa_keygen(2048, false) || !ecdsa_keygen(false))
1623                 return 1;
1624
1625 #ifndef HAVE_MINGW
1626         char *filename;
1627         xasprintf(&filename, "%s" SLASH "tinc-up", confbase);
1628         if(access(filename, F_OK)) {
1629                 FILE *f = fopen(filename, "w");
1630                 if(!f) {
1631                         fprintf(stderr, "Could not create file %s: %s\n", filename, strerror(errno));
1632                         return 1;
1633                 }
1634                 fchmod(fileno(f), 0755);
1635                 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");
1636                 fclose(f);
1637         }
1638 #endif
1639
1640         return 0;
1641
1642 }
1643
1644 static int cmd_generate_keys(int argc, char *argv[]) {
1645         return !(rsa_keygen(argc > 1 ? atoi(argv[1]) : 2048, true) && ecdsa_keygen(true));
1646 }
1647
1648 static int cmd_generate_rsa_keys(int argc, char *argv[]) {
1649         return !rsa_keygen(argc > 1 ? atoi(argv[1]) : 2048, true);
1650 }
1651
1652 static int cmd_generate_ecdsa_keys(int argc, char *argv[]) {
1653         return !ecdsa_keygen(true);
1654 }
1655
1656 static int cmd_help(int argc, char *argv[]) {
1657         usage(false);
1658         return 0;
1659 }
1660
1661 static int cmd_version(int argc, char *argv[]) {
1662         version();
1663         return 0;
1664 }
1665
1666 static int cmd_info(int argc, char *argv[]) {
1667         if(argc != 2) {
1668                 fprintf(stderr, "Invalid number of arguments.\n");
1669                 return 1;
1670         }
1671
1672         if(!connect_tincd(true))
1673                 return 1;
1674
1675         return info(fd, argv[1]);
1676 }
1677
1678 static const char *conffiles[] = {
1679         "tinc.conf",
1680         "tinc-up",
1681         "tinc-down",
1682         "subnet-up",
1683         "subnet-down",
1684         "host-up",
1685         "host-down",
1686         NULL,
1687 };
1688
1689 static int cmd_edit(int argc, char *argv[]) {
1690         if(argc != 2) {
1691                 fprintf(stderr, "Invalid number of arguments.\n");
1692                 return 1;
1693         }
1694
1695         char *filename = NULL;
1696
1697         if(strncmp(argv[1], "hosts" SLASH, 6)) {
1698                 for(int i = 0; conffiles[i]; i++) {
1699                         if(!strcmp(argv[1], conffiles[i])) {
1700                                 xasprintf(&filename, "%s" SLASH "%s", confbase, argv[1]);
1701                                 break;
1702                         }
1703                 }
1704         } else {
1705                 argv[1] += 6;
1706         }
1707
1708         if(!filename) {
1709                 xasprintf(&filename, "%s" SLASH "%s", hosts_dir, argv[1]);
1710                 char *dash = strchr(argv[1], '-');
1711                 if(dash) {
1712                         *dash++ = 0;
1713                         if((strcmp(dash, "up") && strcmp(dash, "down")) || !check_id(argv[1])) {
1714                                 fprintf(stderr, "Invalid configuration filename.\n");
1715                                 return 1;
1716                         }
1717                 }
1718         }
1719
1720         char *command;
1721 #ifndef HAVE_MINGW
1722         xasprintf(&command, "\"%s\" \"%s\"", getenv("VISUAL") ?: getenv("EDITOR") ?: "vi", filename);
1723 #else
1724         xasprintf(&command, "edit \"%s\"", filename);
1725 #endif
1726         int result = system(command);
1727         if(result)
1728                 return result;
1729
1730         // Silently try notifying a running tincd of changes.
1731         if(connect_tincd(false))
1732                 sendline(fd, "%d %d", CONTROL, REQ_RELOAD);
1733
1734         return 0;
1735 }
1736
1737 static int export(const char *name, FILE *out) {
1738         char *filename;
1739         xasprintf(&filename, "%s" SLASH "%s", hosts_dir, name);
1740         FILE *in = fopen(filename, "r");
1741         if(!in) {
1742                 fprintf(stderr, "Could not open configuration file %s: %s\n", filename, strerror(errno));
1743                 return 1;
1744         }
1745
1746         fprintf(out, "Name = %s\n", name);
1747         char buf[4096];
1748         while(fgets(buf, sizeof buf, in)) {
1749                 if(strcspn(buf, "\t =") != 4 || strncasecmp(buf, "Name", 4))
1750                         fputs(buf, out);
1751         }
1752
1753         if(ferror(in)) {
1754                 fprintf(stderr, "Error while reading configuration file %s: %s\n", filename, strerror(errno));
1755                 fclose(in);
1756                 return 1;
1757         }
1758
1759         fclose(in);
1760         return 0;
1761 }
1762
1763 static int cmd_export(int argc, char *argv[]) {
1764         char *name = get_my_name();
1765         if(!name)
1766                 return 1;
1767
1768         return export(name, stdout);
1769 }
1770
1771 static int cmd_export_all(int argc, char *argv[]) {
1772         DIR *dir = opendir(hosts_dir);
1773         if(!dir) {
1774                 fprintf(stderr, "Could not open host configuration directory %s: %s\n", hosts_dir, strerror(errno));
1775                 return 1;
1776         }
1777
1778         bool first = true;
1779         int result = 0;
1780         struct dirent *ent;
1781
1782         while((ent = readdir(dir))) {
1783                 if(!check_id(ent->d_name))
1784                         continue;
1785
1786                 if(first)
1787                         first = false;
1788                 else
1789                         printf("#---------------------------------------------------------------#\n");
1790
1791                 result |= export(ent->d_name, stdout);
1792         }
1793
1794         closedir(dir);
1795         return result;
1796 }
1797
1798 static int cmd_import(int argc, char *argv[]) {
1799         FILE *in = stdin;
1800         FILE *out = NULL;
1801
1802         char buf[4096];
1803         char name[4096];
1804         char *filename;
1805         int count = 0;
1806         bool firstline = true;
1807
1808         while(fgets(buf, sizeof buf, in)) {
1809                 if(sscanf(buf, "Name = %s", name) == 1) {
1810                         if(!check_id(name)) {
1811                                 fprintf(stderr, "Invalid Name in input!\n");
1812                                 return 1;
1813                         }
1814
1815                         if(out)
1816                                 fclose(out);
1817
1818                         free(filename);
1819                         xasprintf(&filename, "%s" SLASH "%s", hosts_dir, name);
1820
1821                         if(!force && !access(filename, F_OK)) {
1822                                 fprintf(stderr, "Host configuration file %s already exists, skipping.\n", filename);
1823                                 out = NULL;
1824                                 continue;
1825                         }
1826
1827                         out = fopen(filename, "w");
1828                         if(!out) {
1829                                 fprintf(stderr, "Error creating configuration file %s: %s\n", filename, strerror(errno));
1830                                 return 1;
1831                         }
1832
1833                         count++;
1834                         firstline = false;
1835                         continue;
1836                 } else if(firstline) {
1837                         fprintf(stderr, "Junk at the beginning of the input, ignoring.\n");
1838                         firstline = false;
1839                 }
1840
1841
1842                 if(!strcmp(buf, "#---------------------------------------------------------------#\n"))
1843                         continue;
1844
1845                 if(out) {
1846                         if(fputs(buf, out) < 0) {
1847                                 fprintf(stderr, "Error writing to host configuration file %s: %s\n", filename, strerror(errno));
1848                                 return 1;
1849                         }
1850                 }
1851         }
1852
1853         if(out)
1854                 fclose(out);
1855
1856         if(count) {
1857                 fprintf(stderr, "Imported %d host configuration files.\n", count);
1858                 return 0;
1859         } else {
1860                 fprintf(stderr, "No host configuration files imported.\n");
1861                 return 1;
1862         }
1863 }
1864
1865 static const struct {
1866         const char *command;
1867         int (*function)(int argc, char *argv[]);
1868 } commands[] = {
1869         {"start", cmd_start},
1870         {"stop", cmd_stop},
1871         {"restart", cmd_restart},
1872         {"reload", cmd_reload},
1873         {"dump", cmd_dump},
1874         {"purge", cmd_purge},
1875         {"debug", cmd_debug},
1876         {"retry", cmd_retry},
1877         {"connect", cmd_connect},
1878         {"disconnect", cmd_disconnect},
1879         {"top", cmd_top},
1880         {"pcap", cmd_pcap},
1881         {"log", cmd_log},
1882         {"pid", cmd_pid},
1883         {"config", cmd_config},
1884         {"init", cmd_init},
1885         {"generate-keys", cmd_generate_keys},
1886         {"generate-rsa-keys", cmd_generate_rsa_keys},
1887         {"generate-ecdsa-keys", cmd_generate_ecdsa_keys},
1888         {"help", cmd_help},
1889         {"version", cmd_version},
1890         {"info", cmd_info},
1891         {"edit", cmd_edit},
1892         {"export", cmd_export},
1893         {"export-all", cmd_export_all},
1894         {"import", cmd_import},
1895         {NULL, NULL},
1896 };
1897
1898 #ifdef HAVE_READLINE
1899 static char *complete_command(const char *text, int state) {
1900         static int i;
1901
1902         if(!state)
1903                 i = 0;
1904         else
1905                 i++;
1906
1907         while(commands[i].command) {
1908                 if(!strncasecmp(commands[i].command, text, strlen(text)))
1909                         return xstrdup(commands[i].command);
1910                 i++;
1911         }
1912
1913         return NULL;
1914 }
1915
1916 static char *complete_dump(const char *text, int state) {
1917         const char *matches[] = {"nodes", "edges", "subnets", "connections", "graph", NULL};
1918         static int i;
1919
1920         if(!state)
1921                 i = 0;
1922         else
1923                 i++;
1924
1925         while(matches[i]) {
1926                 if(!strncasecmp(matches[i], text, strlen(text)))
1927                         return xstrdup(matches[i]);
1928                 i++;
1929         }
1930
1931         return NULL;
1932 }
1933
1934 static char *complete_config(const char *text, int state) {
1935         const char *sub[] = {"get", "set", "add", "del"};
1936         static int i;
1937         if(!state) {
1938                 i = 0;
1939                 if(!strchr(rl_line_buffer + 7, ' '))
1940                         i = -4;
1941                 else {
1942                         bool found = false;
1943                         for(int i = 0; i < 4; i++) {
1944                                 if(!strncasecmp(rl_line_buffer + 7, sub[i], strlen(sub[i])) && rl_line_buffer[7 + strlen(sub[i])] == ' ') {
1945                                         found = true;
1946                                         break;
1947                                 }
1948                         }
1949                         if(!found)
1950                                 return NULL;
1951                 }
1952         } else {
1953                 i++;
1954         }
1955
1956         while(i < 0 || variables[i].name) {
1957                 if(i < 0 && !strncasecmp(sub[i + 4], text, strlen(text)))
1958                         return xstrdup(sub[i + 4]);
1959                 if(i >= 0) {
1960                         char *dot = strchr(text, '.');
1961                         if(dot) {
1962                                 if((variables[i].type & VAR_HOST) && !strncasecmp(variables[i].name, dot + 1, strlen(dot + 1))) {
1963                                         char *match;
1964                                         xasprintf(&match, "%.*s.%s", dot - text, text, variables[i].name);
1965                                         return match;
1966                                 }
1967                         } else {
1968                                 if(!strncasecmp(variables[i].name, text, strlen(text)))
1969                                         return xstrdup(variables[i].name);
1970                         }
1971                 }
1972                 i++;
1973         }
1974
1975         return NULL;
1976 }
1977
1978 static char *complete_info(const char *text, int state) {
1979         static int i;
1980         if(!state) {
1981                 i = 0;
1982                 if(!connect_tincd(false))
1983                         return NULL;
1984                 // Check the list of nodes
1985                 sendline(fd, "%d %d", CONTROL, REQ_DUMP_NODES);
1986                 sendline(fd, "%d %d", CONTROL, REQ_DUMP_SUBNETS);
1987         }
1988
1989         while(recvline(fd, line, sizeof line)) {
1990                 char item[4096];
1991                 int n = sscanf(line, "%d %d %s", &code, &req, item);
1992                 if(n == 2) {
1993                         i++;
1994                         if(i >= 2)
1995                                 break;
1996                         else
1997                                 continue;
1998                 }
1999
2000                 if(n != 3) {
2001                         fprintf(stderr, "Unable to parse dump from tincd, n = %d, i = %d.\n", n, i);
2002                         break;
2003                 }
2004
2005                 if(!strncmp(item, text, strlen(text)))
2006                         return xstrdup(strip_weight(item));
2007         }
2008
2009         return NULL;
2010 }
2011
2012 static char *complete_nothing(const char *text, int state) {
2013         return NULL;
2014 }
2015
2016 static char **completion (const char *text, int start, int end) {
2017         char **matches = NULL;
2018
2019         if(!start)
2020                 matches = rl_completion_matches(text, complete_command);
2021         else if(!strncasecmp(rl_line_buffer, "dump ", 5))
2022                 matches = rl_completion_matches(text, complete_dump);
2023         else if(!strncasecmp(rl_line_buffer, "config ", 7))
2024                 matches = rl_completion_matches(text, complete_config);
2025         else if(!strncasecmp(rl_line_buffer, "info ", 5))
2026                 matches = rl_completion_matches(text, complete_info);
2027
2028         return matches;
2029 }
2030 #endif
2031
2032 static int cmd_shell(int argc, char *argv[]) {
2033         char *prompt;
2034         xasprintf(&prompt, "%s> ", identname);
2035         int result = 0;
2036         char buf[4096];
2037         char *line = NULL;
2038         int maxargs = argc + 16;
2039         char **nargv = xmalloc(maxargs * sizeof *nargv);
2040         optind = argc;
2041
2042         for(int i = 0; i < argc; i++)
2043                 nargv[i] = argv[i];
2044
2045 #ifdef HAVE_READLINE
2046         rl_readline_name = "tinc";
2047         rl_completion_entry_function = complete_nothing;
2048         rl_attempted_completion_function = completion;
2049         rl_filename_completion_desired = 0;
2050         char *copy = NULL;
2051 #endif
2052
2053         while(true) {
2054 #ifdef HAVE_READLINE
2055                 if(tty) {
2056                         free(copy);
2057                         free(line);
2058                         rl_basic_word_break_characters = "\t\n ";
2059                         line = readline(prompt);
2060                         if(line)
2061                                 copy = xstrdup(line);
2062                 } else {
2063                         line = fgets(buf, sizeof buf, stdin);
2064                 }
2065 #else
2066                 if(tty)
2067                         fputs(prompt, stdout);
2068
2069                 line = fgets(buf, sizeof buf, stdin);
2070 #endif
2071
2072                 if(!line)
2073                         break;
2074
2075                 /* Ignore comments */
2076
2077                 if(*line == '#')
2078                         continue;
2079
2080                 /* Split */
2081
2082                 int nargc = argc;
2083                 char *p = line + strspn(line, " \t\n");
2084                 char *next = strtok(p, " \t\n");
2085
2086                 while(p && *p) {
2087                         if(nargc >= maxargs) {
2088                                 fprintf(stderr, "next %p '%s', p %p '%s'\n", next, next, p, p);
2089                                 abort();
2090                                 maxargs *= 2;
2091                                 nargv = xrealloc(nargv, maxargs * sizeof *nargv);
2092                         }
2093
2094                         nargv[nargc++] = p;
2095                         p = next;
2096                         next = strtok(NULL, " \t\n");
2097                 }
2098
2099                 if(nargc == argc)
2100                         continue;
2101
2102                 if(!strcasecmp(nargv[argc], "exit") || !strcasecmp(nargv[argc], "quit"))
2103                         return result;
2104
2105                 bool found = false;
2106
2107                 for(int i = 0; commands[i].command; i++) {
2108                         if(!strcasecmp(nargv[argc], commands[i].command)) {
2109                                 result |= commands[i].function(nargc - argc - 1, nargv + argc + 1);
2110                                 found = true;
2111                                 break;
2112                         }
2113                 }
2114
2115 #ifdef HAVE_READLINE
2116                 if(tty && found)
2117                         add_history(copy);
2118 #endif
2119
2120                 if(!found) {
2121                         fprintf(stderr, "Unknown command `%s'.\n", nargv[argc]);
2122                         result |= 1;
2123                 }
2124         }
2125
2126         if(tty)
2127                 printf("\n");
2128         return result;
2129 }
2130
2131
2132 int main(int argc, char *argv[]) {
2133         program_name = argv[0];
2134         orig_argv = argv;
2135         orig_argc = argc;
2136
2137         if(!parse_options(argc, argv))
2138                 return 1;
2139
2140         make_names();
2141
2142         if(show_version) {
2143                 version();
2144                 return 0;
2145         }
2146
2147         if(show_help) {
2148                 usage(false);
2149                 return 0;
2150         }
2151
2152         tty = isatty(0) && isatty(1);
2153
2154         if(optind >= argc)
2155                 return cmd_shell(argc, argv);
2156
2157         for(int i = 0; commands[i].command; i++) {
2158                 if(!strcasecmp(argv[optind], commands[i].command))
2159                         return commands[i].function(argc - optind, argv + optind);
2160         }
2161
2162         fprintf(stderr, "Unknown command `%s'.\n", argv[optind]);
2163         usage(true);
2164         return 1;
2165 }