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

   1 /*
   2     tincctl.c -- Controlling a running tincd
   3     Copyright (C) 2007-2014 Guus Sliepen <guus@tinc-vpn.org>
   4
   5     This program is free software; you can redistribute it and/or modify
   6     it under the terms of the GNU General Public License as published by
   7     the Free Software Foundation; either version 2 of the License, or
   8     (at your option) any later version.
   9
  10     This program is distributed in the hope that it will be useful,
  11     but WITHOUT ANY WARRANTY; without even the implied warranty of
  12     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13     GNU General Public License for more details.
  14
  15     You should have received a copy of the GNU General Public License along
  16     with this program; if not, write to the Free Software Foundation, Inc.,
  17     51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  18 */
  19
  20 #include "system.h"
  21
  22 #include <getopt.h>
  23
  24 #ifdef HAVE_READLINE
  25 #include "readline/readline.h"
  26 #include "readline/history.h"
  27 #endif
  28
  29 #include "xalloc.h"
  30 #include "protocol.h"
  31 #include "control_common.h"
  32 #include "crypto.h"
  33 #include "ecdsagen.h"
  34 #include "info.h"
  35 #include "invitation.h"
  36 #include "names.h"
  37 #include "rsagen.h"
  38 #include "utils.h"
  39 #include "tincctl.h"
  40 #include "top.h"
  41
  42 static char **orig_argv;
  43 static int orig_argc;
  44
  45 /* If nonzero, display usage information and exit. */
  46 static bool show_help = false;
  47
  48 /* If nonzero, print the version on standard output and exit.  */
  49 static bool show_version = false;
  50
  51 static char *name = NULL;
  52 static char controlcookie[1025];
  53 char *tinc_conf = NULL;
  54 char *hosts_dir = NULL;
  55 struct timeval now;
  56
  57 // Horrible global variables...
  58 static int pid = 0;
  59 int fd = -1;
  60 char line[4096];
  61 static int code;
  62 static int req;
  63 static int result;
  64 static bool force = false;
  65 bool tty = true;
  66 bool confbasegiven = false;
  67 bool netnamegiven = false;
  68 char *scriptinterpreter = NULL;
  69 char *scriptextension = "";
  70
  71 static struct option const long_options[] = {
  72         {"config", required_argument, NULL, 'c'},
  73         {"net", required_argument, NULL, 'n'},
  74         {"help", no_argument, NULL, 1},
  75         {"version", no_argument, NULL, 2},
  76         {"pidfile", required_argument, NULL, 3},
  77         {"force", no_argument, NULL, 4},
  78         {NULL, 0, NULL, 0}
  79 };
  80
  81 static void version(void) {
  82         printf("%s version %s (built %s %s, protocol %d.%d)\n", PACKAGE,
  83                    VERSION, __DATE__, __TIME__, PROT_MAJOR, PROT_MINOR);
  84         printf("Copyright (C) 1998-2012 Ivo Timmermans, Guus Sliepen and others.\n"
  85                         "See the AUTHORS file for a complete list.\n\n"
  86                         "tinc comes with ABSOLUTELY NO WARRANTY.  This is free software,\n"
  87                         "and you are welcome to redistribute it under certain conditions;\n"
  88                         "see the file COPYING for details.\n");
  89 }
  90
  91 static void usage(bool status) {
  92         if(status) {
  93                 fprintf(stderr, "Try `%s --help\' for more information.\n", program_name);
  94         } else {
  95                 printf("Usage: %s [options] command\n\n", program_name);
  96                 printf("Valid options are:\n"
  97                                 "  -c, --config=DIR        Read configuration options from DIR.\n"
  98                                 "  -n, --net=NETNAME       Connect to net NETNAME.\n"
  99                                 "      --pidfile=FILENAME  Read control cookie from FILENAME.\n"
 100                                 "      --help              Display this help and exit.\n"
 101                                 "      --version           Output version information and exit.\n"
 102                                 "\n"
 103                                 "Valid commands are:\n"
 104                                 "  init [name]                Create initial configuration files.\n"
 105                                 "  get VARIABLE               Print current value of VARIABLE\n"
 106                                 "  set VARIABLE VALUE         Set VARIABLE to VALUE\n"
 107                                 "  add VARIABLE VALUE         Add VARIABLE with the given VALUE\n"
 108                                 "  del VARIABLE [VALUE]       Remove VARIABLE [only ones with watching VALUE]\n"
 109                                 "  start [tincd options]      Start tincd.\n"
 110                                 "  stop                       Stop tincd.\n"
 111                                 "  restart [tincd options]    Restart tincd.\n"
 112                                 "  reload                     Partially reload configuration of running tincd.\n"
 113                                 "  pid                        Show PID of currently running tincd.\n"
 114                                 "  generate-keys [bits]       Generate new RSA and ECDSA public/private keypairs.\n"
 115                                 "  generate-rsa-keys [bits]   Generate a new RSA public/private keypair.\n"
 116                                 "  generate-ecdsa-keys        Generate a new ECDSA public/private keypair.\n"
 117                                 "  dump                       Dump a list of one of the following things:\n"
 118                                 "    [reachable] nodes        - all known nodes in the VPN\n"
 119                                 "    edges                    - all known connections in the VPN\n"
 120                                 "    subnets                  - all known subnets in the VPN\n"
 121                                 "    connections              - all meta connections with ourself\n"
 122                                 "    [di]graph                - graph of the VPN in dotty format\n"
 123                                 "  info NODE|SUBNET|ADDRESS   Give information about a particular NODE, SUBNET or ADDRESS.\n"
 124                                 "  purge                      Purge unreachable nodes\n"
 125                                 "  debug N                    Set debug level\n"
 126                                 "  retry                      Retry all outgoing connections\n"
 127                                 "  disconnect NODE            Close meta connection with NODE\n"
 128 #ifdef HAVE_CURSES
 129                                 "  top                        Show real-time statistics\n"
 130 #endif
 131                                 "  pcap [snaplen]             Dump traffic in pcap format [up to snaplen bytes per packet]\n"
 132                                 "  log [level]                Dump log output [up to the specified level]\n"
 133                                 "  export                     Export host configuration of local node to standard output\n"
 134                                 "  export-all                 Export all host configuration files to standard output\n"
 135                                 "  import [--force]           Import host configuration file(s) from standard input\n"
 136                                 "  exchange [--force]         Same as export followed by import\n"
 137                                 "  exchange-all [--force]     Same as export-all followed by import\n"
 138                                 "  invite NODE [...]          Generate an invitation for NODE\n"
 139                                 "  join INVITATION            Join a VPN using an INVITIATION\n"
 140                                 "\n");
 141                 printf("Report bugs to tinc@tinc-vpn.org.\n");
 142         }
 143 }
 144
 145 static bool parse_options(int argc, char **argv) {
 146         int r;
 147         int option_index = 0;
 148
 149         while((r = getopt_long(argc, argv, "+c:n:", long_options, &option_index)) != EOF) {
 150                 switch (r) {
 151                         case 0:   /* long option */
 152                                 break;
 153
 154                         case 'c': /* config file */
 155                                 confbase = xstrdup(optarg);
 156                                 confbasegiven = true;
 157                                 break;
 158
 159                         case 'n': /* net name given */
 160                                 netname = xstrdup(optarg);
 161                                 break;
 162
 163                         case 1:   /* show help */
 164                                 show_help = true;
 165                                 break;
 166
 167                         case 2:   /* show version */
 168                                 show_version = true;
 169                                 break;
 170
 171                         case 3:   /* open control socket here */
 172                                 pidfilename = xstrdup(optarg);
 173                                 break;
 174
 175                         case 4:   /* force */
 176                                 force = true;
 177                                 break;
 178
 179                         case '?': /* wrong options */
 180                                 usage(true);
 181                                 return false;
 182
 183                         default:
 184                                 break;
 185                 }
 186         }
 187
 188         if(!netname && (netname = getenv("NETNAME")))
 189                 netname = xstrdup(netname);
 190
 191         /* netname "." is special: a "top-level name" */
 192
 193         if(netname && (!*netname || !strcmp(netname, "."))) {
 194                 free(netname);
 195                 netname = NULL;
 196         }
 197
 198         if(netname && (strpbrk(netname, "\\/") || *netname == '.')) {
 199                 fprintf(stderr, "Invalid character in netname!\n");
 200                 return false;
 201         }
 202
 203         return true;
 204 }
 205
 206 /* Open a file with the desired permissions, minus the umask.
 207    Also, if we want to create an executable file, we call fchmod()
 208    to set the executable bits. */
 209
 210 FILE *fopenmask(const char *filename, const char *mode, mode_t perms) {
 211         mode_t mask = umask(0);
 212         perms &= ~mask;
 213         umask(~perms);
 214         FILE *f = fopen(filename, mode);
 215 #ifdef HAVE_FCHMOD
 216         if((perms & 0444) && f)
 217                 fchmod(fileno(f), perms);
 218 #endif
 219         umask(mask);
 220         return f;
 221 }
 222
 223 static void disable_old_keys(const char *filename, const char *what) {
 224         char tmpfile[PATH_MAX] = "";
 225         char buf[1024];
 226         bool disabled = false;
 227         bool block = false;
 228         bool error = false;
 229         FILE *r, *w;
 230
 231         r = fopen(filename, "r");
 232         if(!r)
 233                 return;
 234
 235         snprintf(tmpfile, sizeof tmpfile, "%s.tmp", filename);
 236
 237         struct stat st = {.st_mode = 0600};
 238         fstat(fileno(r), &st);
 239         w = fopenmask(tmpfile, "w", st.st_mode);
 240
 241         while(fgets(buf, sizeof buf, r)) {
 242                 if(!block && !strncmp(buf, "-----BEGIN ", 11)) {
 243                         if((strstr(buf, " EC ") && strstr(what, "ECDSA")) || (strstr(buf, " RSA ") && strstr(what, "RSA"))) {
 244                                 disabled = true;
 245                                 block = true;
 246                         }
 247                 }
 248
 249                 bool ecdsapubkey = !strncasecmp(buf, "ECDSAPublicKey", 14) && strchr(" \t=", buf[14]) && strstr(what, "ECDSA");
 250
 251                 if(ecdsapubkey)
 252                         disabled = true;
 253
 254                 if(w) {
 255                         if(block || ecdsapubkey)
 256                                 fputc('#', w);
 257                         if(fputs(buf, w) < 0) {
 258                                 error = true;
 259                                 break;
 260                         }
 261                 }
 262
 263                 if(block && !strncmp(buf, "-----END ", 9))
 264                         block = false;
 265         }
 266
 267         if(w)
 268                 if(fclose(w) < 0)
 269                         error = true;
 270         if(ferror(r) || fclose(r) < 0)
 271                 error = true;
 272
 273         if(disabled) {
 274                 if(!w || error) {
 275                         fprintf(stderr, "Warning: old key(s) found, remove them by hand!\n");
 276                         if(w)
 277                                 unlink(tmpfile);
 278                         return;
 279                 }
 280
 281 #ifdef HAVE_MINGW
 282                 // We cannot atomically replace files on Windows.
 283                 char bakfile[PATH_MAX] = "";
 284                 snprintf(bakfile, sizeof bakfile, "%s.bak", filename);
 285                 if(rename(filename, bakfile) || rename(tmpfile, filename)) {
 286                         rename(bakfile, filename);
 287 #else
 288                 if(rename(tmpfile, filename)) {
 289 #endif
 290                         fprintf(stderr, "Warning: old key(s) found, remove them by hand!\n");
 291                 } else  {
 292 #ifdef HAVE_MINGW
 293                         unlink(bakfile);
 294 #endif
 295                         fprintf(stderr, "Warning: old key(s) found and disabled.\n");
 296                 }
 297         }
 298
 299         unlink(tmpfile);
 300 }
 301
 302 static FILE *ask_and_open(const char *filename, const char *what, const char *mode, bool ask, mode_t perms) {
 303         FILE *r;
 304         char *directory;
 305         char buf[PATH_MAX];
 306         char buf2[PATH_MAX];
 307
 308         /* Check stdin and stdout */
 309         if(ask && tty) {
 310                 /* Ask for a file and/or directory name. */
 311                 fprintf(stderr, "Please enter a file to save %s to [%s]: ", what, filename);
 312
 313                 if(fgets(buf, sizeof buf, stdin) == NULL) {
 314                         fprintf(stderr, "Error while reading stdin: %s\n", strerror(errno));
 315                         return NULL;
 316                 }
 317
 318                 size_t len = strlen(buf);
 319                 if(len)
 320                         buf[--len] = 0;
 321
 322                 if(len)
 323                         filename = buf;
 324         }
 325
 326 #ifdef HAVE_MINGW
 327         if(filename[0] != '\\' && filename[0] != '/' && !strchr(filename, ':')) {
 328 #else
 329         if(filename[0] != '/') {
 330 #endif
 331                 /* The directory is a relative path or a filename. */
 332                 directory = get_current_dir_name();
 333                 snprintf(buf2, sizeof buf2, "%s" SLASH "%s", directory, filename);
 334                 filename = buf2;
 335         }
 336
 337         disable_old_keys(filename, what);
 338
 339         /* Open it first to keep the inode busy */
 340
 341         r = fopenmask(filename, mode, perms);
 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 *pubname, *privname;
 359
 360         fprintf(stderr, "Generating ECDSA keypair:\n");
 361
 362         if(!(key = ecdsa_generate())) {
 363                 fprintf(stderr, "Error during key generation!\n");
 364                 return false;
 365         } else
 366                 fprintf(stderr, "Done.\n");
 367
 368         xasprintf(&privname, "%s" SLASH "ecdsa_key.priv", confbase);
 369         f = ask_and_open(privname, "private ECDSA key", "a", ask, 0600);
 370         free(privname);
 371
 372         if(!f)
 373                 return false;
 374
 375         if(!ecdsa_write_pem_private_key(key, f)) {
 376                 fprintf(stderr, "Error writing private key!\n");
 377                 ecdsa_free(key);
 378                 fclose(f);
 379                 return false;
 380         }
 381
 382         fclose(f);
 383
 384         if(name)
 385                 xasprintf(&pubname, "%s" SLASH "hosts" SLASH "%s", confbase, name);
 386         else
 387                 xasprintf(&pubname, "%s" SLASH "ecdsa_key.pub", confbase);
 388
 389         f = ask_and_open(pubname, "public ECDSA key", "a", ask, 0666);
 390         free(pubname);
 391
 392         if(!f)
 393                 return false;
 394
 395         char *pubkey = ecdsa_get_base64_public_key(key);
 396         fprintf(f, "ECDSAPublicKey = %s\n", pubkey);
 397         free(pubkey);
 398
 399         fclose(f);
 400         ecdsa_free(key);
 401
 402         return true;
 403 }
 404
 405 /*
 406   Generate a public/private RSA keypair, and ask for a file to store
 407   them in.
 408 */
 409 static bool rsa_keygen(int bits, bool ask) {
 410         rsa_t *key;
 411         FILE *f;
 412         char *pubname, *privname;
 413
 414         fprintf(stderr, "Generating %d bits keys:\n", bits);
 415
 416         if(!(key = rsa_generate(bits, 0x10001))) {
 417                 fprintf(stderr, "Error during key generation!\n");
 418                 return false;
 419         } else
 420                 fprintf(stderr, "Done.\n");
 421
 422         xasprintf(&privname, "%s" SLASH "rsa_key.priv", confbase);
 423         f = ask_and_open(privname, "private RSA key", "a", ask, 0600);
 424         free(privname);
 425
 426         if(!f)
 427                 return false;
 428
 429         if(!rsa_write_pem_private_key(key, f)) {
 430                 fprintf(stderr, "Error writing private key!\n");
 431                 fclose(f);
 432                 rsa_free(key);
 433                 return false;
 434         }
 435
 436         fclose(f);
 437
 438         if(name)
 439                 xasprintf(&pubname, "%s" SLASH "hosts" SLASH "%s", confbase, name);
 440         else
 441                 xasprintf(&pubname, "%s" SLASH "rsa_key.pub", confbase);
 442
 443         f = ask_and_open(pubname, "public RSA key", "a", ask, 0666);
 444         free(pubname);
 445
 446         if(!f)
 447                 return false;
 448
 449         if(!rsa_write_pem_public_key(key, f)) {
 450                 fprintf(stderr, "Error writing public key!\n");
 451                 fclose(f);
 452                 rsa_free(key);
 453                 return false;
 454         }
 455
 456         fclose(f);
 457         rsa_free(key);
 458
 459         return true;
 460 }
 461
 462 char buffer[4096];
 463 size_t blen = 0;
 464
 465 bool recvline(int fd, char *line, size_t len) {
 466         char *newline = NULL;
 467
 468         if(!fd)
 469                 abort();
 470
 471         while(!(newline = memchr(buffer, '\n', blen))) {
 472                 int result = recv(fd, buffer + blen, sizeof buffer - blen, 0);
 473                 if(result == -1 && errno == EINTR)
 474                         continue;
 475                 else if(result <= 0)
 476                         return false;
 477                 blen += result;
 478         }
 479
 480         if(newline - buffer >= len)
 481                 return false;
 482
 483         len = newline - buffer;
 484
 485         memcpy(line, buffer, len);
 486         line[len] = 0;
 487         memmove(buffer, newline + 1, blen - len - 1);
 488         blen -= len + 1;
 489
 490         return true;
 491 }
 492
 493 bool recvdata(int fd, char *data, size_t len) {
 494         if(len == -1)
 495                 len = blen;
 496
 497         while(blen < len) {
 498                 int result = recv(fd, buffer + blen, sizeof buffer - blen, 0);
 499                 if(result == -1 && errno == EINTR)
 500                         continue;
 501                 else if(result <= 0)
 502                         return false;
 503                 blen += result;
 504         }
 505
 506         memcpy(data, buffer, len);
 507         memmove(buffer, buffer + len, blen - len);
 508         blen -= len;
 509
 510         return true;
 511 }
 512
 513 bool sendline(int fd, char *format, ...) {
 514         static char buffer[4096];
 515         char *p = buffer;
 516         int blen = 0;
 517         va_list ap;
 518
 519         va_start(ap, format);
 520         blen = vsnprintf(buffer, sizeof buffer, format, ap);
 521         va_end(ap);
 522
 523         if(blen < 1 || blen >= sizeof buffer)
 524                 return false;
 525
 526         buffer[blen] = '\n';
 527         blen++;
 528
 529         while(blen) {
 530                 int result = send(fd, p, blen, 0);
 531                 if(result == -1 && errno == EINTR)
 532                         continue;
 533                 else if(result <= 0)
 534                         return false;
 535                 p += result;
 536                 blen -= result;
 537         }
 538
 539         return true;
 540 }
 541
 542 static void pcap(int fd, FILE *out, int snaplen) {
 543         sendline(fd, "%d %d %d", CONTROL, REQ_PCAP, snaplen);
 544         char data[9018];
 545
 546         struct {
 547                 uint32_t magic;
 548                 uint16_t major;
 549                 uint16_t minor;
 550                 uint32_t tz_offset;
 551                 uint32_t tz_accuracy;
 552                 uint32_t snaplen;
 553                 uint32_t ll_type;
 554         } header = {
 555                 0xa1b2c3d4,
 556                 2, 4,
 557                 0, 0,
 558                 snaplen ?: sizeof data,
 559                 1,
 560         };
 561
 562         struct {
 563                 uint32_t tv_sec;
 564                 uint32_t tv_usec;
 565                 uint32_t len;
 566                 uint32_t origlen;
 567         } packet;
 568
 569         struct timeval tv;
 570
 571         fwrite(&header, sizeof header, 1, out);
 572         fflush(out);
 573
 574         char line[32];
 575         while(recvline(fd, line, sizeof line)) {
 576                 int code, req, len;
 577                 int n = sscanf(line, "%d %d %d", &code, &req, &len);
 578                 gettimeofday(&tv, NULL);
 579                 if(n != 3 || code != CONTROL || req != REQ_PCAP || len < 0 || len > sizeof data)
 580                         break;
 581                 if(!recvdata(fd, data, len))
 582                         break;
 583                 packet.tv_sec = tv.tv_sec;
 584                 packet.tv_usec = tv.tv_usec;
 585                 packet.len = len;
 586                 packet.origlen = len;
 587                 fwrite(&packet, sizeof packet, 1, out);
 588                 fwrite(data, len, 1, out);
 589                 fflush(out);
 590         }
 591 }
 592
 593 static void logcontrol(int fd, FILE *out, int level) {
 594         sendline(fd, "%d %d %d", CONTROL, REQ_LOG, level);
 595         char data[1024];
 596         char line[32];
 597
 598         while(recvline(fd, line, sizeof line)) {
 599                 int code, req, len;
 600                 int n = sscanf(line, "%d %d %d", &code, &req, &len);
 601                 if(n != 3 || code != CONTROL || req != REQ_LOG || len < 0 || len > sizeof data)
 602                         break;
 603                 if(!recvdata(fd, data, len))
 604                         break;
 605                 fwrite(data, len, 1, out);
 606                 fputc('\n', out);
 607                 fflush(out);
 608         }
 609 }
 610
 611 #ifdef HAVE_MINGW
 612 static bool remove_service(void) {
 613         SC_HANDLE manager = NULL;
 614         SC_HANDLE service = NULL;
 615         SERVICE_STATUS status = {0};
 616
 617         manager = OpenSCManager(NULL, NULL, SC_MANAGER_ALL_ACCESS);
 618         if(!manager) {
 619                 fprintf(stderr, "Could not open service manager: %s\n", winerror(GetLastError()));
 620                 return false;
 621         }
 622
 623         service = OpenService(manager, identname, SERVICE_ALL_ACCESS);
 624
 625         if(!service) {
 626                 fprintf(stderr, "Could not open %s service: %s\n", identname, winerror(GetLastError()));
 627                 return false;
 628         }
 629
 630         if(!ControlService(service, SERVICE_CONTROL_STOP, &status))
 631                 fprintf(stderr, "Could not stop %s service: %s\n", identname, winerror(GetLastError()));
 632         else
 633                 fprintf(stderr, "%s service stopped\n", identname);
 634
 635         if(!DeleteService(service)) {
 636                 fprintf(stderr, "Could not remove %s service: %s\n", identname, winerror(GetLastError()));
 637                 return false;
 638         }
 639
 640         fprintf(stderr, "%s service removed\n", identname);
 641
 642         return true;
 643 }
 644 #endif
 645
 646 bool connect_tincd(bool verbose) {
 647         if(fd >= 0) {
 648                 fd_set r;
 649                 FD_ZERO(&r);
 650                 FD_SET(fd, &r);
 651                 struct timeval tv = {0, 0};
 652                 if(select(fd + 1, &r, NULL, NULL, &tv)) {
 653                         fprintf(stderr, "Previous connection to tincd lost, reconnecting.\n");
 654                         close(fd);
 655                         fd = -1;
 656                 } else {
 657                         return true;
 658                 }
 659         }
 660
 661         FILE *f = fopen(pidfilename, "r");
 662         if(!f) {
 663                 if(verbose)
 664                         fprintf(stderr, "Could not open pid file %s: %s\n", pidfilename, strerror(errno));
 665                 return false;
 666         }
 667
 668         char host[129];
 669         char port[129];
 670
 671         if(fscanf(f, "%20d %1024s %128s port %128s", &pid, controlcookie, host, port) != 4) {
 672                 if(verbose)
 673                         fprintf(stderr, "Could not parse pid file %s\n", pidfilename);
 674                 fclose(f);
 675                 return false;
 676         }
 677
 678         fclose(f);
 679
 680 #ifndef HAVE_MINGW
 681         struct sockaddr_un sa;
 682         sa.sun_family = AF_UNIX;
 683         strncpy(sa.sun_path, unixsocketname, sizeof sa.sun_path);
 684
 685         fd = socket(AF_UNIX, SOCK_STREAM, 0);
 686         if(fd < 0) {
 687                 if(verbose)
 688                         fprintf(stderr, "Cannot create UNIX socket: %s\n", sockstrerror(sockerrno));
 689                 return false;
 690         }
 691
 692         if(connect(fd, (struct sockaddr *)&sa, sizeof sa) < 0) {
 693                 if(verbose)
 694                         fprintf(stderr, "Cannot connect to UNIX socket %s: %s\n", unixsocketname, sockstrerror(sockerrno));
 695                 close(fd);
 696                 fd = -1;
 697                 return false;
 698         }
 699 #else
 700         struct addrinfo hints = {
 701                 .ai_family = AF_UNSPEC,
 702                 .ai_socktype = SOCK_STREAM,
 703                 .ai_protocol = IPPROTO_TCP,
 704                 .ai_flags = 0,
 705         };
 706
 707         struct addrinfo *res = NULL;
 708
 709         if(getaddrinfo(host, port, &hints, &res) || !res) {
 710                 if(verbose)
 711                         fprintf(stderr, "Cannot resolve %s port %s: %s", host, port, strerror(errno));
 712                 return false;
 713         }
 714
 715         fd = socket(res->ai_family, SOCK_STREAM, IPPROTO_TCP);
 716         if(fd < 0) {
 717                 if(verbose)
 718                         fprintf(stderr, "Cannot create TCP socket: %s\n", sockstrerror(sockerrno));
 719                 return false;
 720         }
 721
 722 #ifdef HAVE_MINGW
 723         unsigned long arg = 0;
 724
 725         if(ioctlsocket(fd, FIONBIO, &arg) != 0) {
 726                 if(verbose)
 727                         fprintf(stderr, "ioctlsocket failed: %s", sockstrerror(sockerrno));
 728         }
 729 #endif
 730
 731         if(connect(fd, res->ai_addr, res->ai_addrlen) < 0) {
 732                 if(verbose)
 733                         fprintf(stderr, "Cannot connect to %s port %s: %s\n", host, port, sockstrerror(sockerrno));
 734                 close(fd);
 735                 fd = -1;
 736                 return false;
 737         }
 738
 739         freeaddrinfo(res);
 740 #endif
 741
 742         char data[4096];
 743         int version;
 744
 745         if(!recvline(fd, line, sizeof line) || sscanf(line, "%d %s %d", &code, data, &version) != 3 || code != 0) {
 746                 if(verbose)
 747                         fprintf(stderr, "Cannot read greeting from control socket: %s\n", sockstrerror(sockerrno));
 748                 close(fd);
 749                 fd = -1;
 750                 return false;
 751         }
 752
 753         sendline(fd, "%d ^%s %d", ID, controlcookie, TINC_CTL_VERSION_CURRENT);
 754
 755         if(!recvline(fd, line, sizeof line) || sscanf(line, "%d %d %d", &code, &version, &pid) != 3 || code != 4 || version != TINC_CTL_VERSION_CURRENT) {
 756                 if(verbose)
 757                         fprintf(stderr, "Could not fully establish control socket connection\n");
 758                 close(fd);
 759                 fd = -1;
 760                 return false;
 761         }
 762
 763         return true;
 764 }
 765
 766
 767 static int cmd_start(int argc, char *argv[]) {
 768         if(connect_tincd(false)) {
 769                 if(netname)
 770                         fprintf(stderr, "A tincd is already running for net `%s' with pid %d.\n", netname, pid);
 771                 else
 772                         fprintf(stderr, "A tincd is already running with pid %d.\n", pid);
 773                 return 0;
 774         }
 775
 776         char *c;
 777         char *slash = strrchr(program_name, '/');
 778
 779 #ifdef HAVE_MINGW
 780         if ((c = strrchr(program_name, '\\')) > slash)
 781                 slash = c;
 782 #endif
 783
 784         if (slash++)
 785                 xasprintf(&c, "%.*stincd", (int)(slash - program_name), program_name);
 786         else
 787                 c = "tincd";
 788
 789         int nargc = 0;
 790         char **nargv = xzalloc((optind + argc) * sizeof *nargv);
 791
 792         nargv[nargc++] = c;
 793         for(int i = 1; i < optind; i++)
 794                 nargv[nargc++] = orig_argv[i];
 795         for(int i = 1; i < argc; i++)
 796                 nargv[nargc++] = argv[i];
 797
 798 #ifdef HAVE_MINGW
 799         execvp(c, nargv);
 800         fprintf(stderr, "Error starting %s: %s\n", c, strerror(errno));
 801         return 1;
 802 #else
 803         pid_t pid = fork();
 804         if(pid == -1) {
 805                 fprintf(stderr, "Could not fork: %s\n", strerror(errno));
 806                 free(nargv);
 807                 return 1;
 808         }
 809
 810         if(!pid)
 811                 exit(execvp(c, nargv));
 812
 813         free(nargv);
 814
 815         int status = -1, result;
 816 #ifdef SIGINT
 817         signal(SIGINT, SIG_IGN);
 818 #endif
 819         result = waitpid(pid, &status, 0);
 820 #ifdef SIGINT
 821         signal(SIGINT, SIG_DFL);
 822 #endif
 823
 824         if(result != pid || !WIFEXITED(status) || WEXITSTATUS(status)) {
 825                 fprintf(stderr, "Error starting %s\n", c);
 826                 return 1;
 827         }
 828
 829         return 0;
 830 #endif
 831 }
 832
 833 static int cmd_stop(int argc, char *argv[]) {
 834         if(argc > 1) {
 835                 fprintf(stderr, "Too many arguments!\n");
 836                 return 1;
 837         }
 838
 839 #ifndef HAVE_MINGW
 840         if(!connect_tincd(true)) {
 841                 if(pid) {
 842                         if(kill(pid, SIGTERM)) {
 843                                 fprintf(stderr, "Could not send TERM signal to process with PID %u: %s\n", pid, strerror(errno));
 844                                 return 1;
 845                         }
 846
 847                         fprintf(stderr, "Sent TERM signal to process with PID %u.\n", pid);
 848                         waitpid(pid, NULL, 0);
 849                         return 0;
 850                 }
 851
 852                 return 1;
 853         }
 854
 855         sendline(fd, "%d %d", CONTROL, REQ_STOP);
 856
 857         while(recvline(fd, line, sizeof line)) {
 858                 // Wait for tincd to close the connection...
 859         }
 860 #else
 861         if(!remove_service())
 862                 return 1;
 863 #endif
 864         close(fd);
 865         pid = 0;
 866         fd = -1;
 867
 868         return 0;
 869 }
 870
 871 static int cmd_restart(int argc, char *argv[]) {
 872         cmd_stop(1, argv);
 873         return cmd_start(argc, argv);
 874 }
 875
 876 static int cmd_reload(int argc, char *argv[]) {
 877         if(argc > 1) {
 878                 fprintf(stderr, "Too many arguments!\n");
 879                 return 1;
 880         }
 881
 882         if(!connect_tincd(true))
 883                 return 1;
 884
 885         sendline(fd, "%d %d", CONTROL, REQ_RELOAD);
 886         if(!recvline(fd, line, sizeof line) || sscanf(line, "%d %d %d", &code, &req, &result) != 3 || code != CONTROL || req != REQ_RELOAD || result) {
 887                 fprintf(stderr, "Could not reload configuration.\n");
 888                 return 1;
 889         }
 890
 891         return 0;
 892
 893 }
 894
 895 static int cmd_dump(int argc, char *argv[]) {
 896         bool only_reachable = false;
 897
 898         if(argc > 2 && !strcasecmp(argv[1], "reachable")) {
 899                 if(strcasecmp(argv[2], "nodes")) {
 900                         fprintf(stderr, "`reachable' only supported for nodes.\n");
 901                         usage(true);
 902                         return 1;
 903                 }
 904                 only_reachable = true;
 905                 argv++;
 906                 argc--;
 907         }
 908
 909         if(argc != 2) {
 910                 fprintf(stderr, "Invalid number of arguments.\n");
 911                 usage(true);
 912                 return 1;
 913         }
 914
 915         if(!connect_tincd(true))
 916                 return 1;
 917
 918         int do_graph = 0;
 919
 920         if(!strcasecmp(argv[1], "nodes"))
 921                 sendline(fd, "%d %d", CONTROL, REQ_DUMP_NODES);
 922         else if(!strcasecmp(argv[1], "edges"))
 923                 sendline(fd, "%d %d", CONTROL, REQ_DUMP_EDGES);
 924         else if(!strcasecmp(argv[1], "subnets"))
 925                 sendline(fd, "%d %d", CONTROL, REQ_DUMP_SUBNETS);
 926         else if(!strcasecmp(argv[1], "connections"))
 927                 sendline(fd, "%d %d", CONTROL, REQ_DUMP_CONNECTIONS);
 928         else if(!strcasecmp(argv[1], "graph")) {
 929                 sendline(fd, "%d %d", CONTROL, REQ_DUMP_NODES);
 930                 sendline(fd, "%d %d", CONTROL, REQ_DUMP_EDGES);
 931                 do_graph = 1;
 932         } else if(!strcasecmp(argv[1], "digraph")) {
 933                 sendline(fd, "%d %d", CONTROL, REQ_DUMP_NODES);
 934                 sendline(fd, "%d %d", CONTROL, REQ_DUMP_EDGES);
 935                 do_graph = 2;
 936         } else {
 937                 fprintf(stderr, "Unknown dump type '%s'.\n", argv[1]);
 938                 usage(true);
 939                 return 1;
 940         }
 941
 942         if(do_graph == 1)
 943                 printf("graph {\n");
 944         else if(do_graph == 2)
 945                 printf("digraph {\n");
 946
 947         while(recvline(fd, line, sizeof line)) {
 948                 char node1[4096], node2[4096];
 949                 int n = sscanf(line, "%d %d %s %s", &code, &req, node1, node2);
 950                 if(n == 2) {
 951                         if(do_graph && req == REQ_DUMP_NODES)
 952                                 continue;
 953                         else {
 954                                 if(do_graph)
 955                                         printf("}\n");
 956                                 return 0;
 957                         }
 958                 }
 959                 if(n < 2)
 960                         break;
 961
 962                 char node[4096];
 963                 char from[4096];
 964                 char to[4096];
 965                 char subnet[4096];
 966                 char host[4096];
 967                 char port[4096];
 968                 char via[4096];
 969                 char nexthop[4096];
 970                 int cipher, digest, maclength, compression, distance, socket, weight;
 971                 short int pmtu, minmtu, maxmtu;
 972                 unsigned int options, status_int;
 973                 node_status_t status;
 974                 long int last_state_change;
 975
 976                 switch(req) {
 977                         case REQ_DUMP_NODES: {
 978                                 int n = sscanf(line, "%*d %*d %s %s port %s %d %d %d %d %x %x %s %s %d %hd %hd %hd %ld", node, host, port, &cipher, &digest, &maclength, &compression, &options, &status_int, nexthop, via, &distance, &pmtu, &minmtu, &maxmtu, &last_state_change);
 979                                 if(n != 16) {
 980                                         fprintf(stderr, "Unable to parse node dump from tincd: %s\n", line);
 981                                         return 1;
 982                                 }
 983
 984                                 memcpy(&status, &status_int, sizeof status);
 985
 986                                 if(do_graph) {
 987                                         const char *color = "black";
 988                                         if(!strcmp(host, "MYSELF"))
 989                                                 color = "green";
 990                                         else if(!status.reachable)
 991                                                 color = "red";
 992                                         else if(strcmp(via, node))
 993                                                 color = "orange";
 994                                         else if(!status.validkey)
 995                                                 color = "black";
 996                                         else if(minmtu > 0)
 997                                                 color = "green";
 998                                         printf(" %s [label = \"%s\", color = \"%s\"%s];\n", node, node, color, strcmp(host, "MYSELF") ? "" : ", style = \"filled\"");
 999                                 } else {
1000                                         if(only_reachable && !status.reachable)
1001                                                 continue;
1002                                         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",
1003                                                         node, host, port, cipher, digest, maclength, compression, options, status_int, nexthop, via, distance, pmtu, minmtu, maxmtu);
1004                                 }
1005                         } break;
1006
1007                         case REQ_DUMP_EDGES: {
1008                                 int n = sscanf(line, "%*d %*d %s %s %s port %s %x %d", from, to, host, port, &options, &weight);
1009                                 if(n != 6) {
1010                                         fprintf(stderr, "Unable to parse edge dump from tincd.\n");
1011                                         return 1;
1012                                 }
1013
1014                                 if(do_graph) {
1015                                         float w = 1 + 65536.0 / weight;
1016                                         if(do_graph == 1 && strcmp(node1, node2) > 0)
1017                                                 printf(" %s -- %s [w = %f, weight = %f];\n", node1, node2, w, w);
1018                                         else if(do_graph == 2)
1019                                                 printf(" %s -> %s [w = %f, weight = %f];\n", node1, node2, w, w);
1020                                 } else {
1021                                         printf("%s to %s at %s port %s options %x weight %d\n", from, to, host, port, options, weight);
1022                                 }
1023                         } break;
1024
1025                         case REQ_DUMP_SUBNETS: {
1026                                 int n = sscanf(line, "%*d %*d %s %s", subnet, node);
1027                                 if(n != 2) {
1028                                         fprintf(stderr, "Unable to parse subnet dump from tincd.\n");
1029                                         return 1;
1030                                 }
1031                                 printf("%s owner %s\n", strip_weight(subnet), node);
1032                         } break;
1033
1034                         case REQ_DUMP_CONNECTIONS: {
1035                                 int n = sscanf(line, "%*d %*d %s %s port %s %x %d %x", node, host, port, &options, &socket, &status_int);
1036                                 if(n != 6) {
1037                                         fprintf(stderr, "Unable to parse connection dump from tincd.\n");
1038                                         return 1;
1039                                 }
1040                                 printf("%s at %s port %s options %x socket %d status %x\n", node, host, port, options, socket, status_int);
1041                         } break;
1042
1043                         default:
1044                                 fprintf(stderr, "Unable to parse dump from tincd.\n");
1045                                 return 1;
1046                 }
1047         }
1048
1049         fprintf(stderr, "Error receiving dump.\n");
1050         return 1;
1051 }
1052
1053 static int cmd_purge(int argc, char *argv[]) {
1054         if(argc > 1) {
1055                 fprintf(stderr, "Too many arguments!\n");
1056                 return 1;
1057         }
1058
1059         if(!connect_tincd(true))
1060                 return 1;
1061
1062         sendline(fd, "%d %d", CONTROL, REQ_PURGE);
1063         if(!recvline(fd, line, sizeof line) || sscanf(line, "%d %d %d", &code, &req, &result) != 3 || code != CONTROL || req != REQ_PURGE || result) {
1064                 fprintf(stderr, "Could not purge old information.\n");
1065                 return 1;
1066         }
1067
1068         return 0;
1069 }
1070
1071 static int cmd_debug(int argc, char *argv[]) {
1072         if(argc != 2) {
1073                 fprintf(stderr, "Invalid number of arguments.\n");
1074                 return 1;
1075         }
1076
1077         if(!connect_tincd(true))
1078                 return 1;
1079
1080         int debuglevel = atoi(argv[1]);
1081         int origlevel;
1082
1083         sendline(fd, "%d %d %d", CONTROL, REQ_SET_DEBUG, debuglevel);
1084         if(!recvline(fd, line, sizeof line) || sscanf(line, "%d %d %d", &code, &req, &origlevel) != 3 || code != CONTROL || req != REQ_SET_DEBUG) {
1085                 fprintf(stderr, "Could not set debug level.\n");
1086                 return 1;
1087         }
1088
1089         fprintf(stderr, "Old level %d, new level %d.\n", origlevel, debuglevel);
1090         return 0;
1091 }
1092
1093 static int cmd_retry(int argc, char *argv[]) {
1094         if(argc > 1) {
1095                 fprintf(stderr, "Too many arguments!\n");
1096                 return 1;
1097         }
1098
1099         if(!connect_tincd(true))
1100                 return 1;
1101
1102         sendline(fd, "%d %d", CONTROL, REQ_RETRY);
1103         if(!recvline(fd, line, sizeof line) || sscanf(line, "%d %d %d", &code, &req, &result) != 3 || code != CONTROL || req != REQ_RETRY || result) {
1104                 fprintf(stderr, "Could not retry outgoing connections.\n");
1105                 return 1;
1106         }
1107
1108         return 0;
1109 }
1110
1111 static int cmd_connect(int argc, char *argv[]) {
1112         if(argc != 2) {
1113                 fprintf(stderr, "Invalid number of arguments.\n");
1114                 return 1;
1115         }
1116
1117         if(!check_id(argv[1])) {
1118                 fprintf(stderr, "Invalid name for node.\n");
1119                 return 1;
1120         }
1121
1122         if(!connect_tincd(true))
1123                 return 1;
1124
1125         sendline(fd, "%d %d %s", CONTROL, REQ_CONNECT, argv[1]);
1126         if(!recvline(fd, line, sizeof line) || sscanf(line, "%d %d %d", &code, &req, &result) != 3 || code != CONTROL || req != REQ_CONNECT || result) {
1127                 fprintf(stderr, "Could not connect to %s.\n", argv[1]);
1128                 return 1;
1129         }
1130
1131         return 0;
1132 }
1133
1134 static int cmd_disconnect(int argc, char *argv[]) {
1135         if(argc != 2) {
1136                 fprintf(stderr, "Invalid number of arguments.\n");
1137                 return 1;
1138         }
1139
1140         if(!check_id(argv[1])) {
1141                 fprintf(stderr, "Invalid name for node.\n");
1142                 return 1;
1143         }
1144
1145         if(!connect_tincd(true))
1146                 return 1;
1147
1148         sendline(fd, "%d %d %s", CONTROL, REQ_DISCONNECT, argv[1]);
1149         if(!recvline(fd, line, sizeof line) || sscanf(line, "%d %d %d", &code, &req, &result) != 3 || code != CONTROL || req != REQ_DISCONNECT || result) {
1150                 fprintf(stderr, "Could not disconnect %s.\n", argv[1]);
1151                 return 1;
1152         }
1153
1154         return 0;
1155 }
1156
1157 static int cmd_top(int argc, char *argv[]) {
1158         if(argc > 1) {
1159                 fprintf(stderr, "Too many arguments!\n");
1160                 return 1;
1161         }
1162
1163 #ifdef HAVE_CURSES
1164         if(!connect_tincd(true))
1165                 return 1;
1166
1167         top(fd);
1168         return 0;
1169 #else
1170         fprintf(stderr, "This version of tinc was compiled without support for the curses library.\n");
1171         return 1;
1172 #endif
1173 }
1174
1175 static int cmd_pcap(int argc, char *argv[]) {
1176         if(argc > 2) {
1177                 fprintf(stderr, "Too many arguments!\n");
1178                 return 1;
1179         }
1180
1181         if(!connect_tincd(true))
1182                 return 1;
1183
1184         pcap(fd, stdout, argc > 1 ? atoi(argv[1]) : 0);
1185         return 0;
1186 }
1187
1188 #ifdef SIGINT
1189 static void sigint_handler(int sig) {
1190         fprintf(stderr, "\n");
1191         shutdown(fd, SHUT_RDWR);
1192 }
1193 #endif
1194
1195 static int cmd_log(int argc, char *argv[]) {
1196         if(argc > 2) {
1197                 fprintf(stderr, "Too many arguments!\n");
1198                 return 1;
1199         }
1200
1201         if(!connect_tincd(true))
1202                 return 1;
1203
1204 #ifdef SIGINT
1205         signal(SIGINT, sigint_handler);
1206 #endif
1207
1208         logcontrol(fd, stdout, argc > 1 ? atoi(argv[1]) : -1);
1209
1210 #ifdef SIGINT
1211         signal(SIGINT, SIG_DFL);
1212 #endif
1213
1214         close(fd);
1215         fd = -1;
1216         return 0;
1217 }
1218
1219 static int cmd_pid(int argc, char *argv[]) {
1220         if(argc > 1) {
1221                 fprintf(stderr, "Too many arguments!\n");
1222                 return 1;
1223         }
1224
1225         if(!connect_tincd(true) && !pid)
1226                 return 1;
1227
1228         printf("%d\n", pid);
1229         return 0;
1230 }
1231
1232 int rstrip(char *value) {
1233         int len = strlen(value);
1234         while(len && strchr("\t\r\n ", value[len - 1]))
1235                 value[--len] = 0;
1236         return len;
1237 }
1238
1239 char *get_my_name(bool verbose) {
1240         FILE *f = fopen(tinc_conf, "r");
1241         if(!f) {
1242                 if(verbose)
1243                         fprintf(stderr, "Could not open %s: %s\n", tinc_conf, strerror(errno));
1244                 return NULL;
1245         }
1246
1247         char buf[4096];
1248         char *value;
1249         while(fgets(buf, sizeof buf, f)) {
1250                 int len = strcspn(buf, "\t =");
1251                 value = buf + len;
1252                 value += strspn(value, "\t ");
1253                 if(*value == '=') {
1254                         value++;
1255                         value += strspn(value, "\t ");
1256                 }
1257                 if(!rstrip(value))
1258                         continue;
1259                 buf[len] = 0;
1260                 if(strcasecmp(buf, "Name"))
1261                         continue;
1262                 if(*value) {
1263                         fclose(f);
1264                         return strdup(value);
1265                 }
1266         }
1267
1268         fclose(f);
1269         if(verbose)
1270                 fprintf(stderr, "Could not find Name in %s.\n", tinc_conf);
1271         return NULL;
1272 }
1273
1274 const var_t variables[] = {
1275         /* Server configuration */
1276         {"AddressFamily", VAR_SERVER},
1277         {"AutoConnect", VAR_SERVER | VAR_SAFE},
1278         {"BindToAddress", VAR_SERVER | VAR_MULTIPLE},
1279         {"BindToInterface", VAR_SERVER},
1280         {"Broadcast", VAR_SERVER | VAR_SAFE},
1281         {"ConnectTo", VAR_SERVER | VAR_MULTIPLE | VAR_SAFE},
1282         {"DecrementTTL", VAR_SERVER},
1283         {"Device", VAR_SERVER},
1284         {"DeviceType", VAR_SERVER},
1285         {"DirectOnly", VAR_SERVER},
1286         {"ECDSAPrivateKeyFile", VAR_SERVER},
1287         {"ExperimentalProtocol", VAR_SERVER},
1288         {"Forwarding", VAR_SERVER},
1289         {"GraphDumpFile", VAR_SERVER | VAR_OBSOLETE},
1290         {"Hostnames", VAR_SERVER},
1291         {"IffOneQueue", VAR_SERVER},
1292         {"Interface", VAR_SERVER},
1293         {"KeyExpire", VAR_SERVER},
1294         {"ListenAddress", VAR_SERVER | VAR_MULTIPLE},
1295         {"LocalDiscovery", VAR_SERVER},
1296         {"MACExpire", VAR_SERVER},
1297         {"MaxConnectionBurst", VAR_SERVER},
1298         {"MaxOutputBufferSize", VAR_SERVER},
1299         {"MaxTimeout", VAR_SERVER},
1300         {"Mode", VAR_SERVER | VAR_SAFE},
1301         {"Name", VAR_SERVER},
1302         {"PingInterval", VAR_SERVER},
1303         {"PingTimeout", VAR_SERVER},
1304         {"PriorityInheritance", VAR_SERVER},
1305         {"PrivateKey", VAR_SERVER | VAR_OBSOLETE},
1306         {"PrivateKeyFile", VAR_SERVER},
1307         {"ProcessPriority", VAR_SERVER},
1308         {"Proxy", VAR_SERVER},
1309         {"ReplayWindow", VAR_SERVER},
1310         {"ScriptsExtension", VAR_SERVER},
1311         {"ScriptsInterpreter", VAR_SERVER},
1312         {"StrictSubnets", VAR_SERVER},
1313         {"TunnelServer", VAR_SERVER},
1314         {"UDPRcvBuf", VAR_SERVER},
1315         {"UDPSndBuf", VAR_SERVER},
1316         {"VDEGroup", VAR_SERVER},
1317         {"VDEPort", VAR_SERVER},
1318         /* Host configuration */
1319         {"Address", VAR_HOST | VAR_MULTIPLE},
1320         {"Cipher", VAR_SERVER | VAR_HOST},
1321         {"ClampMSS", VAR_SERVER | VAR_HOST},
1322         {"Compression", VAR_SERVER | VAR_HOST},
1323         {"Digest", VAR_SERVER | VAR_HOST},
1324         {"ECDSAPublicKey", VAR_HOST},
1325         {"ECDSAPublicKeyFile", VAR_SERVER | VAR_HOST},
1326         {"IndirectData", VAR_SERVER | VAR_HOST},
1327         {"MACLength", VAR_SERVER | VAR_HOST},
1328         {"PMTU", VAR_SERVER | VAR_HOST},
1329         {"PMTUDiscovery", VAR_SERVER | VAR_HOST},
1330         {"Port", VAR_HOST},
1331         {"PublicKey", VAR_HOST | VAR_OBSOLETE},
1332         {"PublicKeyFile", VAR_SERVER | VAR_HOST | VAR_OBSOLETE},
1333         {"Subnet", VAR_HOST | VAR_MULTIPLE | VAR_SAFE},
1334         {"TCPOnly", VAR_SERVER | VAR_HOST},
1335         {"Weight", VAR_HOST | VAR_SAFE},
1336         {NULL, 0}
1337 };
1338
1339 static int cmd_config(int argc, char *argv[]) {
1340         if(argc < 2) {
1341                 fprintf(stderr, "Invalid number of arguments.\n");
1342                 return 1;
1343         }
1344
1345         if(strcasecmp(argv[0], "config"))
1346                 argv--, argc++;
1347
1348         int action = -2;
1349         if(!strcasecmp(argv[1], "get")) {
1350                 argv++, argc--;
1351         } else if(!strcasecmp(argv[1], "add")) {
1352                 argv++, argc--, action = 1;
1353         } else if(!strcasecmp(argv[1], "del")) {
1354                 argv++, argc--, action = -1;
1355         } else if(!strcasecmp(argv[1], "replace") || !strcasecmp(argv[1], "set") || !strcasecmp(argv[1], "change")) {
1356                 argv++, argc--, action = 0;
1357         }
1358
1359         if(argc < 2) {
1360                 fprintf(stderr, "Invalid number of arguments.\n");
1361                 return 1;
1362         }
1363
1364         // Concatenate the rest of the command line
1365         strncpy(line, argv[1], sizeof line - 1);
1366         for(int i = 2; i < argc; i++) {
1367                 strncat(line, " ", sizeof line - 1 - strlen(line));
1368                 strncat(line, argv[i], sizeof line - 1 - strlen(line));
1369         }
1370
1371         // Liberal parsing into node name, variable name and value.
1372         char *node = NULL;
1373         char *variable;
1374         char *value;
1375         int len;
1376
1377         len = strcspn(line, "\t =");
1378         value = line + len;
1379         value += strspn(value, "\t ");
1380         if(*value == '=') {
1381                 value++;
1382                 value += strspn(value, "\t ");
1383         }
1384         line[len] = '\0';
1385         variable = strchr(line, '.');
1386         if(variable) {
1387                 node = line;
1388                 *variable++ = 0;
1389         } else {
1390                 variable = line;
1391         }
1392
1393         if(!*variable) {
1394                 fprintf(stderr, "No variable given.\n");
1395                 return 1;
1396         }
1397
1398         if(action >= 0 && !*value) {
1399                 fprintf(stderr, "No value for variable given.\n");
1400                 return 1;
1401         }
1402
1403         if(action < -1 && *value)
1404                 action = 0;
1405
1406         /* Some simple checks. */
1407         bool found = false;
1408         bool warnonremove = false;
1409
1410         for(int i = 0; variables[i].name; i++) {
1411                 if(strcasecmp(variables[i].name, variable))
1412                         continue;
1413
1414                 found = true;
1415                 variable = (char *)variables[i].name;
1416
1417                 /* Discourage use of obsolete variables. */
1418
1419                 if(variables[i].type & VAR_OBSOLETE && action >= 0) {
1420                         if(force) {
1421                                 fprintf(stderr, "Warning: %s is an obsolete variable!\n", variable);
1422                         } else {
1423                                 fprintf(stderr, "%s is an obsolete variable! Use --force to use it anyway.\n", variable);
1424                                 return 1;
1425                         }
1426                 }
1427
1428                 /* Don't put server variables in host config files */
1429
1430                 if(node && !(variables[i].type & VAR_HOST) && action >= 0) {
1431                         if(force) {
1432                                 fprintf(stderr, "Warning: %s is not a host configuration variable!\n", variable);
1433                         } else {
1434                                 fprintf(stderr, "%s is not a host configuration variable! Use --force to use it anyway.\n", variable);
1435                                 return 1;
1436                         }
1437                 }
1438
1439                 /* Should this go into our own host config file? */
1440
1441                 if(!node && !(variables[i].type & VAR_SERVER)) {
1442                         node = get_my_name(true);
1443                         if(!node)
1444                                 return 1;
1445                 }
1446
1447                 /* Change "add" into "set" for variables that do not allow multiple occurences.
1448                    Turn on warnings when it seems variables might be removed unintentionally. */
1449
1450                 if(action == 1 && !(variables[i].type & VAR_MULTIPLE)) {
1451                         warnonremove = true;
1452                         action = 0;
1453                 } else if(action == 0 && (variables[i].type & VAR_MULTIPLE)) {
1454                         warnonremove = true;
1455                 }
1456
1457                 break;
1458         }
1459
1460         if(node && !check_id(node)) {
1461                 fprintf(stderr, "Invalid name for node.\n");
1462                 return 1;
1463         }
1464
1465         if(!found) {
1466                 if(force || action < 0) {
1467                         fprintf(stderr, "Warning: %s is not a known configuration variable!\n", variable);
1468                 } else {
1469                         fprintf(stderr, "%s: is not a known configuration variable! Use --force to use it anyway.\n", variable);
1470                         return 1;
1471                 }
1472         }
1473
1474         // Open the right configuration file.
1475         char *filename;
1476         if(node)
1477                 xasprintf(&filename, "%s" SLASH "%s", hosts_dir, node);
1478         else
1479                 filename = tinc_conf;
1480
1481         FILE *f = fopen(filename, "r");
1482         if(!f) {
1483                 fprintf(stderr, "Could not open configuration file %s: %s\n", filename, strerror(errno));
1484                 return 1;
1485         }
1486
1487         char *tmpfile = NULL;
1488         FILE *tf = NULL;
1489
1490         if(action >= -1) {
1491                 xasprintf(&tmpfile, "%s.config.tmp", filename);
1492                 tf = fopen(tmpfile, "w");
1493                 if(!tf) {
1494                         fprintf(stderr, "Could not open temporary file %s: %s\n", tmpfile, strerror(errno));
1495                         fclose(f);
1496                         return 1;
1497                 }
1498         }
1499
1500         // Copy the file, making modifications on the fly, unless we are just getting a value.
1501         char buf1[4096];
1502         char buf2[4096];
1503         bool set = false;
1504         bool removed = false;
1505         found = false;
1506
1507         while(fgets(buf1, sizeof buf1, f)) {
1508                 buf1[sizeof buf1 - 1] = 0;
1509                 strncpy(buf2, buf1, sizeof buf2);
1510
1511                 // Parse line in a simple way
1512                 char *bvalue;
1513                 int len;
1514
1515                 len = strcspn(buf2, "\t =");
1516                 bvalue = buf2 + len;
1517                 bvalue += strspn(bvalue, "\t ");
1518                 if(*bvalue == '=') {
1519                         bvalue++;
1520                         bvalue += strspn(bvalue, "\t ");
1521                 }
1522                 rstrip(bvalue);
1523                 buf2[len] = '\0';
1524
1525                 // Did it match?
1526                 if(!strcasecmp(buf2, variable)) {
1527                         // Get
1528                         if(action < -1) {
1529                                 found = true;
1530                                 printf("%s\n", bvalue);
1531                         // Del
1532                         } else if(action == -1) {
1533                                 if(!*value || !strcasecmp(bvalue, value)) {
1534                                         removed = true;
1535                                         continue;
1536                                 }
1537                         // Set
1538                         } else if(action == 0) {
1539                                 // Warn if "set" was used for variables that can occur multiple times
1540                                 if(warnonremove && strcasecmp(bvalue, value))
1541                                         fprintf(stderr, "Warning: removing %s = %s\n", variable, bvalue);
1542
1543                                 // Already set? Delete the rest...
1544                                 if(set)
1545                                         continue;
1546
1547                                 // Otherwise, replace.
1548                                 if(fprintf(tf, "%s = %s\n", variable, value) < 0) {
1549                                         fprintf(stderr, "Error writing to temporary file %s: %s\n", tmpfile, strerror(errno));
1550                                         return 1;
1551                                 }
1552                                 set = true;
1553                                 continue;
1554                         }
1555                 }
1556
1557                 if(action >= -1) {
1558                         // Copy original line...
1559                         if(fputs(buf1, tf) < 0) {
1560                                 fprintf(stderr, "Error writing to temporary file %s: %s\n", tmpfile, strerror(errno));
1561                                 return 1;
1562                         }
1563
1564                         // Add newline if it is missing...
1565                         if(*buf1 && buf1[strlen(buf1) - 1] != '\n') {
1566                                 if(fputc('\n', tf) < 0) {
1567                                         fprintf(stderr, "Error writing to temporary file %s: %s\n", tmpfile, strerror(errno));
1568                                         return 1;
1569                                 }
1570                         }
1571                 }
1572         }
1573
1574         // Make sure we read everything...
1575         if(ferror(f) || !feof(f)) {
1576                 fprintf(stderr, "Error while reading from configuration file %s: %s\n", filename, strerror(errno));
1577                 return 1;
1578         }
1579
1580         if(fclose(f)) {
1581                 fprintf(stderr, "Error closing configuration file %s: %s\n", filename, strerror(errno));
1582                 return 1;
1583         }
1584
1585         // Add new variable if necessary.
1586         if(action > 0 || (action == 0 && !set)) {
1587                 if(fprintf(tf, "%s = %s\n", variable, value) < 0) {
1588                         fprintf(stderr, "Error writing to temporary file %s: %s\n", tmpfile, strerror(errno));
1589                         return 1;
1590                 }
1591         }
1592
1593         if(action < -1) {
1594                 if(!found)
1595                         fprintf(stderr, "No matching configuration variables found.\n");
1596                 return 0;
1597         }
1598
1599         // Make sure we wrote everything...
1600         if(fclose(tf)) {
1601                 fprintf(stderr, "Error closing temporary file %s: %s\n", tmpfile, strerror(errno));
1602                 return 1;
1603         }
1604
1605         // Could we find what we had to remove?
1606         if(action < 0 && !removed) {
1607                 remove(tmpfile);
1608                 fprintf(stderr, "No configuration variables deleted.\n");
1609                 return *value != 0;
1610         }
1611
1612         // Replace the configuration file with the new one
1613 #ifdef HAVE_MINGW
1614         if(remove(filename)) {
1615                 fprintf(stderr, "Error replacing file %s: %s\n", filename, strerror(errno));
1616                 return 1;
1617         }
1618 #endif
1619         if(rename(tmpfile, filename)) {
1620                 fprintf(stderr, "Error renaming temporary file %s to configuration file %s: %s\n", tmpfile, filename, strerror(errno));
1621                 return 1;
1622         }
1623
1624         // Silently try notifying a running tincd of changes.
1625         if(connect_tincd(false))
1626                 sendline(fd, "%d %d", CONTROL, REQ_RELOAD);
1627
1628         return 0;
1629 }
1630
1631 bool check_id(const char *name) {
1632         if(!name || !*name)
1633                 return false;
1634
1635         for(int i = 0; i < strlen(name); i++) {
1636                 if(!isalnum(name[i]) && name[i] != '_')
1637                         return false;
1638         }
1639
1640         return true;
1641 }
1642
1643 static bool try_bind(int port) {
1644         struct addrinfo *ai = NULL;
1645         struct addrinfo hint = {
1646                 .ai_flags = AI_PASSIVE,
1647                 .ai_family = AF_UNSPEC,
1648                 .ai_socktype = SOCK_STREAM,
1649                 .ai_protocol = IPPROTO_TCP,
1650         };
1651
1652         char portstr[16];
1653         snprintf(portstr, sizeof portstr, "%d", port);
1654
1655         if(getaddrinfo(NULL, portstr, &hint, &ai) || !ai)
1656                 return false;
1657
1658         while(ai) {
1659                 int fd = socket(ai->ai_family, SOCK_STREAM, IPPROTO_TCP);
1660                 if(!fd)
1661                         return false;
1662                 int result = bind(fd, ai->ai_addr, ai->ai_addrlen);
1663                 closesocket(fd);
1664                 if(result)
1665                         return false;
1666                 ai = ai->ai_next;
1667         }
1668
1669         return true;
1670 }
1671
1672 int check_port(char *name) {
1673         if(try_bind(655))
1674                 return 655;
1675
1676         fprintf(stderr, "Warning: could not bind to port 655. ");
1677
1678         for(int i = 0; i < 100; i++) {
1679                 int port = 0x1000 + (rand() & 0x7fff);
1680                 if(try_bind(port)) {
1681                         char *filename;
1682                         xasprintf(&filename, "%s" SLASH "hosts" SLASH "%s", confbase, name);
1683                         FILE *f = fopen(filename, "a");
1684                         free(filename);
1685                         if(!f) {
1686                                 fprintf(stderr, "Please change tinc's Port manually.\n");
1687                                 return 0;
1688                         }
1689
1690                         fprintf(f, "Port = %d\n", port);
1691                         fclose(f);
1692                         fprintf(stderr, "Tinc will instead listen on port %d.\n", port);
1693                         return port;
1694                 }
1695         }
1696
1697         fprintf(stderr, "Please change tinc's Port manually.\n");
1698         return 0;
1699 }
1700
1701 static int cmd_init(int argc, char *argv[]) {
1702         if(!access(tinc_conf, F_OK)) {
1703                 fprintf(stderr, "Configuration file %s already exists!\n", tinc_conf);
1704                 return 1;
1705         }
1706
1707         if(argc > 2) {
1708                 fprintf(stderr, "Too many arguments!\n");
1709                 return 1;
1710         } else if(argc < 2) {
1711                 if(tty) {
1712                         char buf[1024];
1713                         fprintf(stderr, "Enter the Name you want your tinc node to have: ");
1714                         if(!fgets(buf, sizeof buf, stdin)) {
1715                                 fprintf(stderr, "Error while reading stdin: %s\n", strerror(errno));
1716                                 return 1;
1717                         }
1718                         int len = rstrip(buf);
1719                         if(!len) {
1720                                 fprintf(stderr, "No name given!\n");
1721                                 return 1;
1722                         }
1723                         name = strdup(buf);
1724                 } else {
1725                         fprintf(stderr, "No Name given!\n");
1726                         return 1;
1727                 }
1728         } else {
1729                 name = strdup(argv[1]);
1730                 if(!*name) {
1731                         fprintf(stderr, "No Name given!\n");
1732                         return 1;
1733                 }
1734         }
1735
1736         if(!check_id(name)) {
1737                 fprintf(stderr, "Invalid Name! Only a-z, A-Z, 0-9 and _ are allowed characters.\n");
1738                 return 1;
1739         }
1740
1741         if(!confbase_given && mkdir(confdir, 0755) && errno != EEXIST) {
1742                 fprintf(stderr, "Could not create directory %s: %s\n", confdir, strerror(errno));
1743                 return 1;
1744         }
1745
1746         if(mkdir(confbase, 0777) && errno != EEXIST) {
1747                 fprintf(stderr, "Could not create directory %s: %s\n", confbase, strerror(errno));
1748                 return 1;
1749         }
1750
1751         if(mkdir(hosts_dir, 0777) && errno != EEXIST) {
1752                 fprintf(stderr, "Could not create directory %s: %s\n", hosts_dir, strerror(errno));
1753                 return 1;
1754         }
1755
1756         FILE *f = fopen(tinc_conf, "w");
1757         if(!f) {
1758                 fprintf(stderr, "Could not create file %s: %s\n", tinc_conf, strerror(errno));
1759                 return 1;
1760         }
1761
1762         fprintf(f, "Name = %s\n", name);
1763         fclose(f);
1764
1765         if(!rsa_keygen(2048, false) || !ecdsa_keygen(false))
1766                 return 1;
1767
1768         check_port(name);
1769
1770 #ifndef HAVE_MINGW
1771         char *filename;
1772         xasprintf(&filename, "%s" SLASH "tinc-up", confbase);
1773         if(access(filename, F_OK)) {
1774                 FILE *f = fopenmask(filename, "w", 0777);
1775                 if(!f) {
1776                         fprintf(stderr, "Could not create file %s: %s\n", filename, strerror(errno));
1777                         return 1;
1778                 }
1779                 fprintf(f, "#!/bin/sh\n\necho 'Unconfigured tinc-up script, please edit '$0'!'\n\n#ifconfig $INTERFACE <your vpn IP address> netmask <netmask of whole VPN>\n");
1780                 fclose(f);
1781         }
1782 #endif
1783
1784         return 0;
1785
1786 }
1787
1788 static int cmd_generate_keys(int argc, char *argv[]) {
1789         if(argc > 2) {
1790                 fprintf(stderr, "Too many arguments!\n");
1791                 return 1;
1792         }
1793
1794         if(!name)
1795                 name = get_my_name(false);
1796
1797         return !(rsa_keygen(argc > 1 ? atoi(argv[1]) : 2048, true) && ecdsa_keygen(true));
1798 }
1799
1800 static int cmd_generate_rsa_keys(int argc, char *argv[]) {
1801         if(argc > 2) {
1802                 fprintf(stderr, "Too many arguments!\n");
1803                 return 1;
1804         }
1805
1806         if(!name)
1807                 name = get_my_name(false);
1808
1809         return !rsa_keygen(argc > 1 ? atoi(argv[1]) : 2048, true);
1810 }
1811
1812 static int cmd_generate_ecdsa_keys(int argc, char *argv[]) {
1813         if(argc > 1) {
1814                 fprintf(stderr, "Too many arguments!\n");
1815                 return 1;
1816         }
1817
1818         if(!name)
1819                 name = get_my_name(false);
1820
1821         return !ecdsa_keygen(true);
1822 }
1823
1824 static int cmd_help(int argc, char *argv[]) {
1825         usage(false);
1826         return 0;
1827 }
1828
1829 static int cmd_version(int argc, char *argv[]) {
1830         if(argc > 1) {
1831                 fprintf(stderr, "Too many arguments!\n");
1832                 return 1;
1833         }
1834
1835         version();
1836         return 0;
1837 }
1838
1839 static int cmd_info(int argc, char *argv[]) {
1840         if(argc != 2) {
1841                 fprintf(stderr, "Invalid number of arguments.\n");
1842                 return 1;
1843         }
1844
1845         if(!connect_tincd(true))
1846                 return 1;
1847
1848         return info(fd, argv[1]);
1849 }
1850
1851 static const char *conffiles[] = {
1852         "tinc.conf",
1853         "tinc-up",
1854         "tinc-down",
1855         "subnet-up",
1856         "subnet-down",
1857         "host-up",
1858         "host-down",
1859         NULL,
1860 };
1861
1862 static int cmd_edit(int argc, char *argv[]) {
1863         if(argc != 2) {
1864                 fprintf(stderr, "Invalid number of arguments.\n");
1865                 return 1;
1866         }
1867
1868         char *filename = NULL;
1869
1870         if(strncmp(argv[1], "hosts" SLASH, 6)) {
1871                 for(int i = 0; conffiles[i]; i++) {
1872                         if(!strcmp(argv[1], conffiles[i])) {
1873                                 xasprintf(&filename, "%s" SLASH "%s", confbase, argv[1]);
1874                                 break;
1875                         }
1876                 }
1877         } else {
1878                 argv[1] += 6;
1879         }
1880
1881         if(!filename) {
1882                 xasprintf(&filename, "%s" SLASH "%s", hosts_dir, argv[1]);
1883                 char *dash = strchr(argv[1], '-');
1884                 if(dash) {
1885                         *dash++ = 0;
1886                         if((strcmp(dash, "up") && strcmp(dash, "down")) || !check_id(argv[1])) {
1887                                 fprintf(stderr, "Invalid configuration filename.\n");
1888                                 return 1;
1889                         }
1890                 }
1891         }
1892
1893         char *command;
1894 #ifndef HAVE_MINGW
1895         xasprintf(&command, "\"%s\" \"%s\"", getenv("VISUAL") ?: getenv("EDITOR") ?: "vi", filename);
1896 #else
1897         xasprintf(&command, "edit \"%s\"", filename);
1898 #endif
1899         int result = system(command);
1900         if(result)
1901                 return result;
1902
1903         // Silently try notifying a running tincd of changes.
1904         if(connect_tincd(false))
1905                 sendline(fd, "%d %d", CONTROL, REQ_RELOAD);
1906
1907         return 0;
1908 }
1909
1910 static int export(const char *name, FILE *out) {
1911         char *filename;
1912         xasprintf(&filename, "%s" SLASH "%s", hosts_dir, name);
1913         FILE *in = fopen(filename, "r");
1914         if(!in) {
1915                 fprintf(stderr, "Could not open configuration file %s: %s\n", filename, strerror(errno));
1916                 return 1;
1917         }
1918
1919         fprintf(out, "Name = %s\n", name);
1920         char buf[4096];
1921         while(fgets(buf, sizeof buf, in)) {
1922                 if(strcspn(buf, "\t =") != 4 || strncasecmp(buf, "Name", 4))
1923                         fputs(buf, out);
1924         }
1925
1926         if(ferror(in)) {
1927                 fprintf(stderr, "Error while reading configuration file %s: %s\n", filename, strerror(errno));
1928                 fclose(in);
1929                 return 1;
1930         }
1931
1932         fclose(in);
1933         return 0;
1934 }
1935
1936 static int cmd_export(int argc, char *argv[]) {
1937         if(argc > 1) {
1938                 fprintf(stderr, "Too many arguments!\n");
1939                 return 1;
1940         }
1941
1942         char *name = get_my_name(true);
1943         if(!name)
1944                 return 1;
1945
1946         int result = export(name, stdout);
1947         if(!tty)
1948                 fclose(stdout);
1949
1950         free(name);
1951         return result;
1952 }
1953
1954 static int cmd_export_all(int argc, char *argv[]) {
1955         if(argc > 1) {
1956                 fprintf(stderr, "Too many arguments!\n");
1957                 return 1;
1958         }
1959
1960         DIR *dir = opendir(hosts_dir);
1961         if(!dir) {
1962                 fprintf(stderr, "Could not open host configuration directory %s: %s\n", hosts_dir, strerror(errno));
1963                 return 1;
1964         }
1965
1966         bool first = true;
1967         int result = 0;
1968         struct dirent *ent;
1969
1970         while((ent = readdir(dir))) {
1971                 if(!check_id(ent->d_name))
1972                         continue;
1973
1974                 if(first)
1975                         first = false;
1976                 else
1977                         printf("#---------------------------------------------------------------#\n");
1978
1979                 result |= export(ent->d_name, stdout);
1980         }
1981
1982         closedir(dir);
1983         if(!tty)
1984                 fclose(stdout);
1985         return result;
1986 }
1987
1988 static int cmd_import(int argc, char *argv[]) {
1989         if(argc > 1) {
1990                 fprintf(stderr, "Too many arguments!\n");
1991                 return 1;
1992         }
1993
1994         FILE *in = stdin;
1995         FILE *out = NULL;
1996
1997         char buf[4096];
1998         char name[4096];
1999         char *filename = NULL;
2000         int count = 0;
2001         bool firstline = true;
2002
2003         while(fgets(buf, sizeof buf, in)) {
2004                 if(sscanf(buf, "Name = %s", name) == 1) {
2005                         firstline = false;
2006
2007                         if(!check_id(name)) {
2008                                 fprintf(stderr, "Invalid Name in input!\n");
2009                                 return 1;
2010                         }
2011
2012                         if(out)
2013                                 fclose(out);
2014
2015                         free(filename);
2016                         xasprintf(&filename, "%s" SLASH "%s", hosts_dir, name);
2017
2018                         if(!force && !access(filename, F_OK)) {
2019                                 fprintf(stderr, "Host configuration file %s already exists, skipping.\n", filename);
2020                                 out = NULL;
2021                                 continue;
2022                         }
2023
2024                         out = fopen(filename, "w");
2025                         if(!out) {
2026                                 fprintf(stderr, "Error creating configuration file %s: %s\n", filename, strerror(errno));
2027                                 return 1;
2028                         }
2029
2030                         count++;
2031                         continue;
2032                 } else if(firstline) {
2033                         fprintf(stderr, "Junk at the beginning of the input, ignoring.\n");
2034                         firstline = false;
2035                 }
2036
2037
2038                 if(!strcmp(buf, "#---------------------------------------------------------------#\n"))
2039                         continue;
2040
2041                 if(out) {
2042                         if(fputs(buf, out) < 0) {
2043                                 fprintf(stderr, "Error writing to host configuration file %s: %s\n", filename, strerror(errno));
2044                                 return 1;
2045                         }
2046                 }
2047         }
2048
2049         if(out)
2050                 fclose(out);
2051
2052         if(count) {
2053                 fprintf(stderr, "Imported %d host configuration files.\n", count);
2054                 return 0;
2055         } else {
2056                 fprintf(stderr, "No host configuration files imported.\n");
2057                 return 1;
2058         }
2059 }
2060
2061 static int cmd_exchange(int argc, char *argv[]) {
2062         return cmd_export(argc, argv) ?: cmd_import(argc, argv);
2063 }
2064
2065 static int cmd_exchange_all(int argc, char *argv[]) {
2066         return cmd_export_all(argc, argv) ?: cmd_import(argc, argv);
2067 }
2068
2069 static const struct {
2070         const char *command;
2071         int (*function)(int argc, char *argv[]);
2072         bool hidden;
2073 } commands[] = {
2074         {"start", cmd_start},
2075         {"stop", cmd_stop},
2076         {"restart", cmd_restart},
2077         {"reload", cmd_reload},
2078         {"dump", cmd_dump},
2079         {"purge", cmd_purge},
2080         {"debug", cmd_debug},
2081         {"retry", cmd_retry},
2082         {"connect", cmd_connect},
2083         {"disconnect", cmd_disconnect},
2084         {"top", cmd_top},
2085         {"pcap", cmd_pcap},
2086         {"log", cmd_log},
2087         {"pid", cmd_pid},
2088         {"config", cmd_config, true},
2089         {"add", cmd_config},
2090         {"del", cmd_config},
2091         {"get", cmd_config},
2092         {"set", cmd_config},
2093         {"init", cmd_init},
2094         {"generate-keys", cmd_generate_keys},
2095         {"generate-rsa-keys", cmd_generate_rsa_keys},
2096         {"generate-ecdsa-keys", cmd_generate_ecdsa_keys},
2097         {"help", cmd_help},
2098         {"version", cmd_version},
2099         {"info", cmd_info},
2100         {"edit", cmd_edit},
2101         {"export", cmd_export},
2102         {"export-all", cmd_export_all},
2103         {"import", cmd_import},
2104         {"exchange", cmd_exchange},
2105         {"exchange-all", cmd_exchange_all},
2106         {"invite", cmd_invite},
2107         {"join", cmd_join},
2108         {NULL, NULL},
2109 };
2110
2111 #ifdef HAVE_READLINE
2112 static char *complete_command(const char *text, int state) {
2113         static int i;
2114
2115         if(!state)
2116                 i = 0;
2117         else
2118                 i++;
2119
2120         while(commands[i].command) {
2121                 if(!commands[i].hidden && !strncasecmp(commands[i].command, text, strlen(text)))
2122                         return xstrdup(commands[i].command);
2123                 i++;
2124         }
2125
2126         return NULL;
2127 }
2128
2129 static char *complete_dump(const char *text, int state) {
2130         const char *matches[] = {"reachable", "nodes", "edges", "subnets", "connections", "graph", NULL};
2131         static int i;
2132
2133         if(!state)
2134                 i = 0;
2135         else
2136                 i++;
2137
2138         while(matches[i]) {
2139                 if(!strncasecmp(matches[i], text, strlen(text)))
2140                         return xstrdup(matches[i]);
2141                 i++;
2142         }
2143
2144         return NULL;
2145 }
2146
2147 static char *complete_config(const char *text, int state) {
2148         static int i;
2149
2150         if(!state)
2151                 i = 0;
2152         else
2153                 i++;
2154
2155         while(variables[i].name) {
2156                 char *dot = strchr(text, '.');
2157                 if(dot) {
2158                         if((variables[i].type & VAR_HOST) && !strncasecmp(variables[i].name, dot + 1, strlen(dot + 1))) {
2159                                 char *match;
2160                                 xasprintf(&match, "%.*s.%s", (int)(dot - text), text, variables[i].name);
2161                                 return match;
2162                         }
2163                 } else {
2164                         if(!strncasecmp(variables[i].name, text, strlen(text)))
2165                                 return xstrdup(variables[i].name);
2166                 }
2167                 i++;
2168         }
2169
2170         return NULL;
2171 }
2172
2173 static char *complete_info(const char *text, int state) {
2174         static int i;
2175         if(!state) {
2176                 i = 0;
2177                 if(!connect_tincd(false))
2178                         return NULL;
2179                 // Check the list of nodes
2180                 sendline(fd, "%d %d", CONTROL, REQ_DUMP_NODES);
2181                 sendline(fd, "%d %d", CONTROL, REQ_DUMP_SUBNETS);
2182         }
2183
2184         while(recvline(fd, line, sizeof line)) {
2185                 char item[4096];
2186                 int n = sscanf(line, "%d %d %s", &code, &req, item);
2187                 if(n == 2) {
2188                         i++;
2189                         if(i >= 2)
2190                                 break;
2191                         else
2192                                 continue;
2193                 }
2194
2195                 if(n != 3) {
2196                         fprintf(stderr, "Unable to parse dump from tincd, n = %d, i = %d.\n", n, i);
2197                         break;
2198                 }
2199
2200                 if(!strncmp(item, text, strlen(text)))
2201                         return xstrdup(strip_weight(item));
2202         }
2203
2204         return NULL;
2205 }
2206
2207 static char *complete_nothing(const char *text, int state) {
2208         return NULL;
2209 }
2210
2211 static char **completion (const char *text, int start, int end) {
2212         char **matches = NULL;
2213
2214         if(!start)
2215                 matches = rl_completion_matches(text, complete_command);
2216         else if(!strncasecmp(rl_line_buffer, "dump ", 5))
2217                 matches = rl_completion_matches(text, complete_dump);
2218         else if(!strncasecmp(rl_line_buffer, "add ", 4))
2219                 matches = rl_completion_matches(text, complete_config);
2220         else if(!strncasecmp(rl_line_buffer, "del ", 4))
2221                 matches = rl_completion_matches(text, complete_config);
2222         else if(!strncasecmp(rl_line_buffer, "get ", 4))
2223                 matches = rl_completion_matches(text, complete_config);
2224         else if(!strncasecmp(rl_line_buffer, "set ", 4))
2225                 matches = rl_completion_matches(text, complete_config);
2226         else if(!strncasecmp(rl_line_buffer, "info ", 5))
2227                 matches = rl_completion_matches(text, complete_info);
2228
2229         return matches;
2230 }
2231 #endif
2232
2233 static int cmd_shell(int argc, char *argv[]) {
2234         char *prompt;
2235         xasprintf(&prompt, "%s> ", identname);
2236         int result = 0;
2237         char buf[4096];
2238         char *line = NULL;
2239         int maxargs = argc + 16;
2240         char **nargv = xmalloc(maxargs * sizeof *nargv);
2241
2242         for(int i = 0; i < argc; i++)
2243                 nargv[i] = argv[i];
2244
2245 #ifdef HAVE_READLINE
2246         rl_readline_name = "tinc";
2247         rl_completion_entry_function = complete_nothing;
2248         rl_attempted_completion_function = completion;
2249         rl_filename_completion_desired = 0;
2250         char *copy = NULL;
2251 #endif
2252
2253         while(true) {
2254 #ifdef HAVE_READLINE
2255                 if(tty) {
2256                         free(copy);
2257                         free(line);
2258                         rl_basic_word_break_characters = "\t\n ";
2259                         line = readline(prompt);
2260                         if(line)
2261                                 copy = xstrdup(line);
2262                 } else {
2263                         line = fgets(buf, sizeof buf, stdin);
2264                 }
2265 #else
2266                 if(tty)
2267                         fputs(prompt, stdout);
2268
2269                 line = fgets(buf, sizeof buf, stdin);
2270 #endif
2271
2272                 if(!line)
2273                         break;
2274
2275                 /* Ignore comments */
2276
2277                 if(*line == '#')
2278                         continue;
2279
2280                 /* Split */
2281
2282                 int nargc = argc;
2283                 char *p = line + strspn(line, " \t\n");
2284                 char *next = strtok(p, " \t\n");
2285
2286                 while(p && *p) {
2287                         if(nargc >= maxargs) {
2288                                 fprintf(stderr, "next %p '%s', p %p '%s'\n", next, next, p, p);
2289                                 abort();
2290                                 maxargs *= 2;
2291                                 nargv = xrealloc(nargv, maxargs * sizeof *nargv);
2292                         }
2293
2294                         nargv[nargc++] = p;
2295                         p = next;
2296                         next = strtok(NULL, " \t\n");
2297                 }
2298
2299                 if(nargc == argc)
2300                         continue;
2301
2302                 if(!strcasecmp(nargv[argc], "exit") || !strcasecmp(nargv[argc], "quit"))
2303                         return result;
2304
2305                 bool found = false;
2306
2307                 for(int i = 0; commands[i].command; i++) {
2308                         if(!strcasecmp(nargv[argc], commands[i].command)) {
2309                                 result |= commands[i].function(nargc - argc - 1, nargv + argc + 1);
2310                                 found = true;
2311                                 break;
2312                         }
2313                 }
2314
2315 #ifdef HAVE_READLINE
2316                 if(tty && found)
2317                         add_history(copy);
2318 #endif
2319
2320                 if(!found) {
2321                         fprintf(stderr, "Unknown command `%s'.\n", nargv[argc]);
2322                         result |= 1;
2323                 }
2324         }
2325
2326         free(nargv);
2327
2328         if(tty)
2329                 printf("\n");
2330         return result;
2331 }
2332
2333
2334 int main(int argc, char *argv[]) {
2335         program_name = argv[0];
2336         orig_argv = argv;
2337         orig_argc = argc;
2338
2339         if(!parse_options(argc, argv))
2340                 return 1;
2341
2342         make_names();
2343         xasprintf(&tinc_conf, "%s" SLASH "tinc.conf", confbase);
2344         xasprintf(&hosts_dir, "%s" SLASH "hosts", confbase);
2345
2346         if(show_version) {
2347                 version();
2348                 return 0;
2349         }
2350
2351         if(show_help) {
2352                 usage(false);
2353                 return 0;
2354         }
2355
2356 #ifdef HAVE_MINGW
2357         static struct WSAData wsa_state;
2358
2359         if(WSAStartup(MAKEWORD(2, 2), &wsa_state)) {
2360                 fprintf(stderr, "System call `%s' failed: %s", "WSAStartup", winerror(GetLastError()));
2361                 return false;
2362         }
2363 #endif
2364
2365         srand(time(NULL));
2366         crypto_init();
2367
2368         tty = isatty(0) && isatty(1);
2369
2370         if(optind >= argc)
2371                 return cmd_shell(argc, argv);
2372
2373         for(int i = 0; commands[i].command; i++) {
2374                 if(!strcasecmp(argv[optind], commands[i].command))
2375                         return commands[i].function(argc - optind, argv + optind);
2376         }
2377
2378         fprintf(stderr, "Unknown command `%s'.\n", argv[optind]);
2379         usage(true);
2380         return 1;
2381 }