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 static char *prompt;
  71
  72 static struct option const long_options[] = {
  73         {"config", required_argument, NULL, 'c'},
  74         {"net", required_argument, NULL, 'n'},
  75         {"help", no_argument, NULL, 1},
  76         {"version", no_argument, NULL, 2},
  77         {"pidfile", required_argument, NULL, 3},
  78         {"force", no_argument, NULL, 4},
  79         {NULL, 0, NULL, 0}
  80 };
  81
  82 static void version(void) {
  83         printf("%s version %s (built %s %s, protocol %d.%d)\n", PACKAGE,
  84                    VERSION, __DATE__, __TIME__, PROT_MAJOR, PROT_MINOR);
  85         printf("Copyright (C) 1998-2012 Ivo Timmermans, Guus Sliepen and others.\n"
  86                         "See the AUTHORS file for a complete list.\n\n"
  87                         "tinc comes with ABSOLUTELY NO WARRANTY.  This is free software,\n"
  88                         "and you are welcome to redistribute it under certain conditions;\n"
  89                         "see the file COPYING for details.\n");
  90 }
  91
  92 static void usage(bool status) {
  93         if(status) {
  94                 fprintf(stderr, "Try `%s --help\' for more information.\n", program_name);
  95         } else {
  96                 printf("Usage: %s [options] command\n\n", program_name);
  97                 printf("Valid options are:\n"
  98                                 "  -c, --config=DIR        Read configuration options from DIR.\n"
  99                                 "  -n, --net=NETNAME       Connect to net NETNAME.\n"
 100                                 "      --pidfile=FILENAME  Read control cookie from FILENAME.\n"
 101                                 "      --help              Display this help and exit.\n"
 102                                 "      --version           Output version information and exit.\n"
 103                                 "\n"
 104                                 "Valid commands are:\n"
 105                                 "  init [name]                Create initial configuration files.\n"
 106                                 "  get VARIABLE               Print current value of VARIABLE\n"
 107                                 "  set VARIABLE VALUE         Set VARIABLE to VALUE\n"
 108                                 "  add VARIABLE VALUE         Add VARIABLE with the given VALUE\n"
 109                                 "  del VARIABLE [VALUE]       Remove VARIABLE [only ones with watching VALUE]\n"
 110                                 "  start [tincd options]      Start tincd.\n"
 111                                 "  stop                       Stop tincd.\n"
 112                                 "  restart [tincd options]    Restart tincd.\n"
 113                                 "  reload                     Partially reload configuration of running tincd.\n"
 114                                 "  pid                        Show PID of currently running tincd.\n"
 115                                 "  generate-keys [bits]       Generate new RSA and ECDSA public/private keypairs.\n"
 116                                 "  generate-rsa-keys [bits]   Generate a new RSA public/private keypair.\n"
 117                                 "  generate-ecdsa-keys        Generate a new ECDSA public/private keypair.\n"
 118                                 "  dump                       Dump a list of one of the following things:\n"
 119                                 "    [reachable] nodes        - all known nodes in the VPN\n"
 120                                 "    edges                    - all known connections in the VPN\n"
 121                                 "    subnets                  - all known subnets in the VPN\n"
 122                                 "    connections              - all meta connections with ourself\n"
 123                                 "    [di]graph                - graph of the VPN in dotty format\n"
 124                                 "  info NODE|SUBNET|ADDRESS   Give information about a particular NODE, SUBNET or ADDRESS.\n"
 125                                 "  purge                      Purge unreachable nodes\n"
 126                                 "  debug N                    Set debug level\n"
 127                                 "  retry                      Retry all outgoing connections\n"
 128                                 "  disconnect NODE            Close meta connection with NODE\n"
 129 #ifdef HAVE_CURSES
 130                                 "  top                        Show real-time statistics\n"
 131 #endif
 132                                 "  pcap [snaplen]             Dump traffic in pcap format [up to snaplen bytes per packet]\n"
 133                                 "  log [level]                Dump log output [up to the specified level]\n"
 134                                 "  export                     Export host configuration of local node to standard output\n"
 135                                 "  export-all                 Export all host configuration files to standard output\n"
 136                                 "  import [--force]           Import host configuration file(s) from standard input\n"
 137                                 "  exchange [--force]         Same as export followed by import\n"
 138                                 "  exchange-all [--force]     Same as export-all followed by import\n"
 139                                 "  invite NODE [...]          Generate an invitation for NODE\n"
 140                                 "  join INVITATION            Join a VPN using an INVITIATION\n"
 141                                 "  network [NETNAME]          List all known networks, or switch to the one named NETNAME.\n"
 142                                 "\n");
 143                 printf("Report bugs to tinc@tinc-vpn.org.\n");
 144         }
 145 }
 146
 147 static bool parse_options(int argc, char **argv) {
 148         int r;
 149         int option_index = 0;
 150
 151         while((r = getopt_long(argc, argv, "+c:n:", long_options, &option_index)) != EOF) {
 152                 switch (r) {
 153                         case 0:   /* long option */
 154                                 break;
 155
 156                         case 'c': /* config file */
 157                                 confbase = xstrdup(optarg);
 158                                 confbasegiven = true;
 159                                 break;
 160
 161                         case 'n': /* net name given */
 162                                 netname = xstrdup(optarg);
 163                                 break;
 164
 165                         case 1:   /* show help */
 166                                 show_help = true;
 167                                 break;
 168
 169                         case 2:   /* show version */
 170                                 show_version = true;
 171                                 break;
 172
 173                         case 3:   /* open control socket here */
 174                                 pidfilename = xstrdup(optarg);
 175                                 break;
 176
 177                         case 4:   /* force */
 178                                 force = true;
 179                                 break;
 180
 181                         case '?': /* wrong options */
 182                                 usage(true);
 183                                 return false;
 184
 185                         default:
 186                                 break;
 187                 }
 188         }
 189
 190         if(!netname && (netname = getenv("NETNAME")))
 191                 netname = xstrdup(netname);
 192
 193         /* netname "." is special: a "top-level name" */
 194
 195         if(netname && (!*netname || !strcmp(netname, "."))) {
 196                 free(netname);
 197                 netname = NULL;
 198         }
 199
 200         if(netname && (strpbrk(netname, "\\/") || *netname == '.')) {
 201                 fprintf(stderr, "Invalid character in netname!\n");
 202                 return false;
 203         }
 204
 205         return true;
 206 }
 207
 208 /* Open a file with the desired permissions, minus the umask.
 209    Also, if we want to create an executable file, we call fchmod()
 210    to set the executable bits. */
 211
 212 FILE *fopenmask(const char *filename, const char *mode, mode_t perms) {
 213         mode_t mask = umask(0);
 214         perms &= ~mask;
 215         umask(~perms);
 216         FILE *f = fopen(filename, mode);
 217 #ifdef HAVE_FCHMOD
 218         if((perms & 0444) && f)
 219                 fchmod(fileno(f), perms);
 220 #endif
 221         umask(mask);
 222         return f;
 223 }
 224
 225 static void disable_old_keys(const char *filename, const char *what) {
 226         char tmpfile[PATH_MAX] = "";
 227         char buf[1024];
 228         bool disabled = false;
 229         bool block = false;
 230         bool error = false;
 231         FILE *r, *w;
 232
 233         r = fopen(filename, "r");
 234         if(!r)
 235                 return;
 236
 237         snprintf(tmpfile, sizeof tmpfile, "%s.tmp", filename);
 238
 239         struct stat st = {.st_mode = 0600};
 240         fstat(fileno(r), &st);
 241         w = fopenmask(tmpfile, "w", st.st_mode);
 242
 243         while(fgets(buf, sizeof buf, r)) {
 244                 if(!block && !strncmp(buf, "-----BEGIN ", 11)) {
 245                         if((strstr(buf, " EC ") && strstr(what, "ECDSA")) || (strstr(buf, " RSA ") && strstr(what, "RSA"))) {
 246                                 disabled = true;
 247                                 block = true;
 248                         }
 249                 }
 250
 251                 bool ecdsapubkey = !strncasecmp(buf, "ECDSAPublicKey", 14) && strchr(" \t=", buf[14]) && strstr(what, "ECDSA");
 252
 253                 if(ecdsapubkey)
 254                         disabled = true;
 255
 256                 if(w) {
 257                         if(block || ecdsapubkey)
 258                                 fputc('#', w);
 259                         if(fputs(buf, w) < 0) {
 260                                 error = true;
 261                                 break;
 262                         }
 263                 }
 264
 265                 if(block && !strncmp(buf, "-----END ", 9))
 266                         block = false;
 267         }
 268
 269         if(w)
 270                 if(fclose(w) < 0)
 271                         error = true;
 272         if(ferror(r) || fclose(r) < 0)
 273                 error = true;
 274
 275         if(disabled) {
 276                 if(!w || error) {
 277                         fprintf(stderr, "Warning: old key(s) found, remove them by hand!\n");
 278                         if(w)
 279                                 unlink(tmpfile);
 280                         return;
 281                 }
 282
 283 #ifdef HAVE_MINGW
 284                 // We cannot atomically replace files on Windows.
 285                 char bakfile[PATH_MAX] = "";
 286                 snprintf(bakfile, sizeof bakfile, "%s.bak", filename);
 287                 if(rename(filename, bakfile) || rename(tmpfile, filename)) {
 288                         rename(bakfile, filename);
 289 #else
 290                 if(rename(tmpfile, filename)) {
 291 #endif
 292                         fprintf(stderr, "Warning: old key(s) found, remove them by hand!\n");
 293                 } else  {
 294 #ifdef HAVE_MINGW
 295                         unlink(bakfile);
 296 #endif
 297                         fprintf(stderr, "Warning: old key(s) found and disabled.\n");
 298                 }
 299         }
 300
 301         unlink(tmpfile);
 302 }
 303
 304 static FILE *ask_and_open(const char *filename, const char *what, const char *mode, bool ask, mode_t perms) {
 305         FILE *r;
 306         char *directory;
 307         char buf[PATH_MAX];
 308         char buf2[PATH_MAX];
 309
 310         /* Check stdin and stdout */
 311         if(ask && tty) {
 312                 /* Ask for a file and/or directory name. */
 313                 fprintf(stderr, "Please enter a file to save %s to [%s]: ", what, filename);
 314
 315                 if(fgets(buf, sizeof buf, stdin) == NULL) {
 316                         fprintf(stderr, "Error while reading stdin: %s\n", strerror(errno));
 317                         return NULL;
 318                 }
 319
 320                 size_t len = strlen(buf);
 321                 if(len)
 322                         buf[--len] = 0;
 323
 324                 if(len)
 325                         filename = buf;
 326         }
 327
 328 #ifdef HAVE_MINGW
 329         if(filename[0] != '\\' && filename[0] != '/' && !strchr(filename, ':')) {
 330 #else
 331         if(filename[0] != '/') {
 332 #endif
 333                 /* The directory is a relative path or a filename. */
 334                 directory = get_current_dir_name();
 335                 snprintf(buf2, sizeof buf2, "%s" SLASH "%s", directory, filename);
 336                 filename = buf2;
 337         }
 338
 339         disable_old_keys(filename, what);
 340
 341         /* Open it first to keep the inode busy */
 342
 343         r = fopenmask(filename, mode, perms);
 344
 345         if(!r) {
 346                 fprintf(stderr, "Error opening file `%s': %s\n", filename, strerror(errno));
 347                 return NULL;
 348         }
 349
 350         return r;
 351 }
 352
 353 /*
 354   Generate a public/private ECDSA keypair, and ask for a file to store
 355   them in.
 356 */
 357 static bool ecdsa_keygen(bool ask) {
 358         ecdsa_t *key;
 359         FILE *f;
 360         char *pubname, *privname;
 361
 362         fprintf(stderr, "Generating ECDSA keypair:\n");
 363
 364         if(!(key = ecdsa_generate())) {
 365                 fprintf(stderr, "Error during key generation!\n");
 366                 return false;
 367         } else
 368                 fprintf(stderr, "Done.\n");
 369
 370         xasprintf(&privname, "%s" SLASH "ecdsa_key.priv", confbase);
 371         f = ask_and_open(privname, "private ECDSA key", "a", ask, 0600);
 372         free(privname);
 373
 374         if(!f)
 375                 return false;
 376
 377         if(!ecdsa_write_pem_private_key(key, f)) {
 378                 fprintf(stderr, "Error writing private key!\n");
 379                 ecdsa_free(key);
 380                 fclose(f);
 381                 return false;
 382         }
 383
 384         fclose(f);
 385
 386         if(name)
 387                 xasprintf(&pubname, "%s" SLASH "hosts" SLASH "%s", confbase, name);
 388         else
 389                 xasprintf(&pubname, "%s" SLASH "ecdsa_key.pub", confbase);
 390
 391         f = ask_and_open(pubname, "public ECDSA key", "a", ask, 0666);
 392         free(pubname);
 393
 394         if(!f)
 395                 return false;
 396
 397         char *pubkey = ecdsa_get_base64_public_key(key);
 398         fprintf(f, "ECDSAPublicKey = %s\n", pubkey);
 399         free(pubkey);
 400
 401         fclose(f);
 402         ecdsa_free(key);
 403
 404         return true;
 405 }
 406
 407 /*
 408   Generate a public/private RSA keypair, and ask for a file to store
 409   them in.
 410 */
 411 static bool rsa_keygen(int bits, bool ask) {
 412         rsa_t *key;
 413         FILE *f;
 414         char *pubname, *privname;
 415
 416         fprintf(stderr, "Generating %d bits keys:\n", bits);
 417
 418         if(!(key = rsa_generate(bits, 0x10001))) {
 419                 fprintf(stderr, "Error during key generation!\n");
 420                 return false;
 421         } else
 422                 fprintf(stderr, "Done.\n");
 423
 424         xasprintf(&privname, "%s" SLASH "rsa_key.priv", confbase);
 425         f = ask_and_open(privname, "private RSA key", "a", ask, 0600);
 426         free(privname);
 427
 428         if(!f)
 429                 return false;
 430
 431         if(!rsa_write_pem_private_key(key, f)) {
 432                 fprintf(stderr, "Error writing private key!\n");
 433                 fclose(f);
 434                 rsa_free(key);
 435                 return false;
 436         }
 437
 438         fclose(f);
 439
 440         if(name)
 441                 xasprintf(&pubname, "%s" SLASH "hosts" SLASH "%s", confbase, name);
 442         else
 443                 xasprintf(&pubname, "%s" SLASH "rsa_key.pub", confbase);
 444
 445         f = ask_and_open(pubname, "public RSA key", "a", ask, 0666);
 446         free(pubname);
 447
 448         if(!f)
 449                 return false;
 450
 451         if(!rsa_write_pem_public_key(key, f)) {
 452                 fprintf(stderr, "Error writing public key!\n");
 453                 fclose(f);
 454                 rsa_free(key);
 455                 return false;
 456         }
 457
 458         fclose(f);
 459         rsa_free(key);
 460
 461         return true;
 462 }
 463
 464 char buffer[4096];
 465 size_t blen = 0;
 466
 467 bool recvline(int fd, char *line, size_t len) {
 468         char *newline = NULL;
 469
 470         if(!fd)
 471                 abort();
 472
 473         while(!(newline = memchr(buffer, '\n', blen))) {
 474                 int result = recv(fd, buffer + blen, sizeof buffer - blen, 0);
 475                 if(result == -1 && errno == EINTR)
 476                         continue;
 477                 else if(result <= 0)
 478                         return false;
 479                 blen += result;
 480         }
 481
 482         if(newline - buffer >= len)
 483                 return false;
 484
 485         len = newline - buffer;
 486
 487         memcpy(line, buffer, len);
 488         line[len] = 0;
 489         memmove(buffer, newline + 1, blen - len - 1);
 490         blen -= len + 1;
 491
 492         return true;
 493 }
 494
 495 bool recvdata(int fd, char *data, size_t len) {
 496         if(len == -1)
 497                 len = blen;
 498
 499         while(blen < len) {
 500                 int result = recv(fd, buffer + blen, sizeof buffer - blen, 0);
 501                 if(result == -1 && errno == EINTR)
 502                         continue;
 503                 else if(result <= 0)
 504                         return false;
 505                 blen += result;
 506         }
 507
 508         memcpy(data, buffer, len);
 509         memmove(buffer, buffer + len, blen - len);
 510         blen -= len;
 511
 512         return true;
 513 }
 514
 515 bool sendline(int fd, char *format, ...) {
 516         static char buffer[4096];
 517         char *p = buffer;
 518         int blen = 0;
 519         va_list ap;
 520
 521         va_start(ap, format);
 522         blen = vsnprintf(buffer, sizeof buffer, format, ap);
 523         va_end(ap);
 524
 525         if(blen < 1 || blen >= sizeof buffer)
 526                 return false;
 527
 528         buffer[blen] = '\n';
 529         blen++;
 530
 531         while(blen) {
 532                 int result = send(fd, p, blen, 0);
 533                 if(result == -1 && errno == EINTR)
 534                         continue;
 535                 else if(result <= 0)
 536                         return false;
 537                 p += result;
 538                 blen -= result;
 539         }
 540
 541         return true;
 542 }
 543
 544 static void pcap(int fd, FILE *out, int snaplen) {
 545         sendline(fd, "%d %d %d", CONTROL, REQ_PCAP, snaplen);
 546         char data[9018];
 547
 548         struct {
 549                 uint32_t magic;
 550                 uint16_t major;
 551                 uint16_t minor;
 552                 uint32_t tz_offset;
 553                 uint32_t tz_accuracy;
 554                 uint32_t snaplen;
 555                 uint32_t ll_type;
 556         } header = {
 557                 0xa1b2c3d4,
 558                 2, 4,
 559                 0, 0,
 560                 snaplen ?: sizeof data,
 561                 1,
 562         };
 563
 564         struct {
 565                 uint32_t tv_sec;
 566                 uint32_t tv_usec;
 567                 uint32_t len;
 568                 uint32_t origlen;
 569         } packet;
 570
 571         struct timeval tv;
 572
 573         fwrite(&header, sizeof header, 1, out);
 574         fflush(out);
 575
 576         char line[32];
 577         while(recvline(fd, line, sizeof line)) {
 578                 int code, req, len;
 579                 int n = sscanf(line, "%d %d %d", &code, &req, &len);
 580                 gettimeofday(&tv, NULL);
 581                 if(n != 3 || code != CONTROL || req != REQ_PCAP || len < 0 || len > sizeof data)
 582                         break;
 583                 if(!recvdata(fd, data, len))
 584                         break;
 585                 packet.tv_sec = tv.tv_sec;
 586                 packet.tv_usec = tv.tv_usec;
 587                 packet.len = len;
 588                 packet.origlen = len;
 589                 fwrite(&packet, sizeof packet, 1, out);
 590                 fwrite(data, len, 1, out);
 591                 fflush(out);
 592         }
 593 }
 594
 595 static void logcontrol(int fd, FILE *out, int level) {
 596         sendline(fd, "%d %d %d", CONTROL, REQ_LOG, level);
 597         char data[1024];
 598         char line[32];
 599
 600         while(recvline(fd, line, sizeof line)) {
 601                 int code, req, len;
 602                 int n = sscanf(line, "%d %d %d", &code, &req, &len);
 603                 if(n != 3 || code != CONTROL || req != REQ_LOG || len < 0 || len > sizeof data)
 604                         break;
 605                 if(!recvdata(fd, data, len))
 606                         break;
 607                 fwrite(data, len, 1, out);
 608                 fputc('\n', out);
 609                 fflush(out);
 610         }
 611 }
 612
 613 #ifdef HAVE_MINGW
 614 static bool remove_service(void) {
 615         SC_HANDLE manager = NULL;
 616         SC_HANDLE service = NULL;
 617         SERVICE_STATUS status = {0};
 618
 619         manager = OpenSCManager(NULL, NULL, SC_MANAGER_ALL_ACCESS);
 620         if(!manager) {
 621                 fprintf(stderr, "Could not open service manager: %s\n", winerror(GetLastError()));
 622                 return false;
 623         }
 624
 625         service = OpenService(manager, identname, SERVICE_ALL_ACCESS);
 626
 627         if(!service) {
 628                 fprintf(stderr, "Could not open %s service: %s\n", identname, winerror(GetLastError()));
 629                 return false;
 630         }
 631
 632         if(!ControlService(service, SERVICE_CONTROL_STOP, &status))
 633                 fprintf(stderr, "Could not stop %s service: %s\n", identname, winerror(GetLastError()));
 634         else
 635                 fprintf(stderr, "%s service stopped\n", identname);
 636
 637         if(!DeleteService(service)) {
 638                 fprintf(stderr, "Could not remove %s service: %s\n", identname, winerror(GetLastError()));
 639                 return false;
 640         }
 641
 642         fprintf(stderr, "%s service removed\n", identname);
 643
 644         return true;
 645 }
 646 #endif
 647
 648 bool connect_tincd(bool verbose) {
 649         if(fd >= 0) {
 650                 fd_set r;
 651                 FD_ZERO(&r);
 652                 FD_SET(fd, &r);
 653                 struct timeval tv = {0, 0};
 654                 if(select(fd + 1, &r, NULL, NULL, &tv)) {
 655                         fprintf(stderr, "Previous connection to tincd lost, reconnecting.\n");
 656                         close(fd);
 657                         fd = -1;
 658                 } else {
 659                         return true;
 660                 }
 661         }
 662
 663         FILE *f = fopen(pidfilename, "r");
 664         if(!f) {
 665                 if(verbose)
 666                         fprintf(stderr, "Could not open pid file %s: %s\n", pidfilename, strerror(errno));
 667                 return false;
 668         }
 669
 670         char host[129];
 671         char port[129];
 672
 673         if(fscanf(f, "%20d %1024s %128s port %128s", &pid, controlcookie, host, port) != 4) {
 674                 if(verbose)
 675                         fprintf(stderr, "Could not parse pid file %s\n", pidfilename);
 676                 fclose(f);
 677                 return false;
 678         }
 679
 680         fclose(f);
 681
 682 #ifndef HAVE_MINGW
 683         struct sockaddr_un sa;
 684         sa.sun_family = AF_UNIX;
 685         strncpy(sa.sun_path, unixsocketname, sizeof sa.sun_path);
 686
 687         fd = socket(AF_UNIX, SOCK_STREAM, 0);
 688         if(fd < 0) {
 689                 if(verbose)
 690                         fprintf(stderr, "Cannot create UNIX socket: %s\n", sockstrerror(sockerrno));
 691                 return false;
 692         }
 693
 694         if(connect(fd, (struct sockaddr *)&sa, sizeof sa) < 0) {
 695                 if(verbose)
 696                         fprintf(stderr, "Cannot connect to UNIX socket %s: %s\n", unixsocketname, sockstrerror(sockerrno));
 697                 close(fd);
 698                 fd = -1;
 699                 return false;
 700         }
 701 #else
 702         struct addrinfo hints = {
 703                 .ai_family = AF_UNSPEC,
 704                 .ai_socktype = SOCK_STREAM,
 705                 .ai_protocol = IPPROTO_TCP,
 706                 .ai_flags = 0,
 707         };
 708
 709         struct addrinfo *res = NULL;
 710
 711         if(getaddrinfo(host, port, &hints, &res) || !res) {
 712                 if(verbose)
 713                         fprintf(stderr, "Cannot resolve %s port %s: %s", host, port, strerror(errno));
 714                 return false;
 715         }
 716
 717         fd = socket(res->ai_family, SOCK_STREAM, IPPROTO_TCP);
 718         if(fd < 0) {
 719                 if(verbose)
 720                         fprintf(stderr, "Cannot create TCP socket: %s\n", sockstrerror(sockerrno));
 721                 return false;
 722         }
 723
 724 #ifdef HAVE_MINGW
 725         unsigned long arg = 0;
 726
 727         if(ioctlsocket(fd, FIONBIO, &arg) != 0) {
 728                 if(verbose)
 729                         fprintf(stderr, "ioctlsocket failed: %s", sockstrerror(sockerrno));
 730         }
 731 #endif
 732
 733         if(connect(fd, res->ai_addr, res->ai_addrlen) < 0) {
 734                 if(verbose)
 735                         fprintf(stderr, "Cannot connect to %s port %s: %s\n", host, port, sockstrerror(sockerrno));
 736                 close(fd);
 737                 fd = -1;
 738                 return false;
 739         }
 740
 741         freeaddrinfo(res);
 742 #endif
 743
 744         char data[4096];
 745         int version;
 746
 747         if(!recvline(fd, line, sizeof line) || sscanf(line, "%d %s %d", &code, data, &version) != 3 || code != 0) {
 748                 if(verbose)
 749                         fprintf(stderr, "Cannot read greeting from control socket: %s\n", sockstrerror(sockerrno));
 750                 close(fd);
 751                 fd = -1;
 752                 return false;
 753         }
 754
 755         sendline(fd, "%d ^%s %d", ID, controlcookie, TINC_CTL_VERSION_CURRENT);
 756
 757         if(!recvline(fd, line, sizeof line) || sscanf(line, "%d %d %d", &code, &version, &pid) != 3 || code != 4 || version != TINC_CTL_VERSION_CURRENT) {
 758                 if(verbose)
 759                         fprintf(stderr, "Could not fully establish control socket connection\n");
 760                 close(fd);
 761                 fd = -1;
 762                 return false;
 763         }
 764
 765         return true;
 766 }
 767
 768
 769 static int cmd_start(int argc, char *argv[]) {
 770         if(connect_tincd(false)) {
 771                 if(netname)
 772                         fprintf(stderr, "A tincd is already running for net `%s' with pid %d.\n", netname, pid);
 773                 else
 774                         fprintf(stderr, "A tincd is already running with pid %d.\n", pid);
 775                 return 0;
 776         }
 777
 778         char *c;
 779         char *slash = strrchr(program_name, '/');
 780
 781 #ifdef HAVE_MINGW
 782         if ((c = strrchr(program_name, '\\')) > slash)
 783                 slash = c;
 784 #endif
 785
 786         if (slash++)
 787                 xasprintf(&c, "%.*stincd", (int)(slash - program_name), program_name);
 788         else
 789                 c = "tincd";
 790
 791         int nargc = 0;
 792         char **nargv = xzalloc((optind + argc) * sizeof *nargv);
 793
 794         nargv[nargc++] = c;
 795         for(int i = 1; i < optind; i++)
 796                 nargv[nargc++] = orig_argv[i];
 797         for(int i = 1; i < argc; i++)
 798                 nargv[nargc++] = argv[i];
 799
 800 #ifdef HAVE_MINGW
 801         execvp(c, nargv);
 802         fprintf(stderr, "Error starting %s: %s\n", c, strerror(errno));
 803         return 1;
 804 #else
 805         pid_t pid = fork();
 806         if(pid == -1) {
 807                 fprintf(stderr, "Could not fork: %s\n", strerror(errno));
 808                 free(nargv);
 809                 return 1;
 810         }
 811
 812         if(!pid)
 813                 exit(execvp(c, nargv));
 814
 815         free(nargv);
 816
 817         int status = -1, result;
 818 #ifdef SIGINT
 819         signal(SIGINT, SIG_IGN);
 820 #endif
 821         result = waitpid(pid, &status, 0);
 822 #ifdef SIGINT
 823         signal(SIGINT, SIG_DFL);
 824 #endif
 825
 826         if(result != pid || !WIFEXITED(status) || WEXITSTATUS(status)) {
 827                 fprintf(stderr, "Error starting %s\n", c);
 828                 return 1;
 829         }
 830
 831         return 0;
 832 #endif
 833 }
 834
 835 static int cmd_stop(int argc, char *argv[]) {
 836         if(argc > 1) {
 837                 fprintf(stderr, "Too many arguments!\n");
 838                 return 1;
 839         }
 840
 841 #ifndef HAVE_MINGW
 842         if(!connect_tincd(true)) {
 843                 if(pid) {
 844                         if(kill(pid, SIGTERM)) {
 845                                 fprintf(stderr, "Could not send TERM signal to process with PID %u: %s\n", pid, strerror(errno));
 846                                 return 1;
 847                         }
 848
 849                         fprintf(stderr, "Sent TERM signal to process with PID %u.\n", pid);
 850                         waitpid(pid, NULL, 0);
 851                         return 0;
 852                 }
 853
 854                 return 1;
 855         }
 856
 857         sendline(fd, "%d %d", CONTROL, REQ_STOP);
 858
 859         while(recvline(fd, line, sizeof line)) {
 860                 // Wait for tincd to close the connection...
 861         }
 862 #else
 863         if(!remove_service())
 864                 return 1;
 865 #endif
 866         close(fd);
 867         pid = 0;
 868         fd = -1;
 869
 870         return 0;
 871 }
 872
 873 static int cmd_restart(int argc, char *argv[]) {
 874         cmd_stop(1, argv);
 875         return cmd_start(argc, argv);
 876 }
 877
 878 static int cmd_reload(int argc, char *argv[]) {
 879         if(argc > 1) {
 880                 fprintf(stderr, "Too many arguments!\n");
 881                 return 1;
 882         }
 883
 884         if(!connect_tincd(true))
 885                 return 1;
 886
 887         sendline(fd, "%d %d", CONTROL, REQ_RELOAD);
 888         if(!recvline(fd, line, sizeof line) || sscanf(line, "%d %d %d", &code, &req, &result) != 3 || code != CONTROL || req != REQ_RELOAD || result) {
 889                 fprintf(stderr, "Could not reload configuration.\n");
 890                 return 1;
 891         }
 892
 893         return 0;
 894
 895 }
 896
 897 static int cmd_dump(int argc, char *argv[]) {
 898         bool only_reachable = false;
 899
 900         if(argc > 2 && !strcasecmp(argv[1], "reachable")) {
 901                 if(strcasecmp(argv[2], "nodes")) {
 902                         fprintf(stderr, "`reachable' only supported for nodes.\n");
 903                         usage(true);
 904                         return 1;
 905                 }
 906                 only_reachable = true;
 907                 argv++;
 908                 argc--;
 909         }
 910
 911         if(argc != 2) {
 912                 fprintf(stderr, "Invalid number of arguments.\n");
 913                 usage(true);
 914                 return 1;
 915         }
 916
 917         if(!connect_tincd(true))
 918                 return 1;
 919
 920         int do_graph = 0;
 921
 922         if(!strcasecmp(argv[1], "nodes"))
 923                 sendline(fd, "%d %d", CONTROL, REQ_DUMP_NODES);
 924         else if(!strcasecmp(argv[1], "edges"))
 925                 sendline(fd, "%d %d", CONTROL, REQ_DUMP_EDGES);
 926         else if(!strcasecmp(argv[1], "subnets"))
 927                 sendline(fd, "%d %d", CONTROL, REQ_DUMP_SUBNETS);
 928         else if(!strcasecmp(argv[1], "connections"))
 929                 sendline(fd, "%d %d", CONTROL, REQ_DUMP_CONNECTIONS);
 930         else if(!strcasecmp(argv[1], "graph")) {
 931                 sendline(fd, "%d %d", CONTROL, REQ_DUMP_NODES);
 932                 sendline(fd, "%d %d", CONTROL, REQ_DUMP_EDGES);
 933                 do_graph = 1;
 934         } else if(!strcasecmp(argv[1], "digraph")) {
 935                 sendline(fd, "%d %d", CONTROL, REQ_DUMP_NODES);
 936                 sendline(fd, "%d %d", CONTROL, REQ_DUMP_EDGES);
 937                 do_graph = 2;
 938         } else {
 939                 fprintf(stderr, "Unknown dump type '%s'.\n", argv[1]);
 940                 usage(true);
 941                 return 1;
 942         }
 943
 944         if(do_graph == 1)
 945                 printf("graph {\n");
 946         else if(do_graph == 2)
 947                 printf("digraph {\n");
 948
 949         while(recvline(fd, line, sizeof line)) {
 950                 char node1[4096], node2[4096];
 951                 int n = sscanf(line, "%d %d %s %s", &code, &req, node1, node2);
 952                 if(n == 2) {
 953                         if(do_graph && req == REQ_DUMP_NODES)
 954                                 continue;
 955                         else {
 956                                 if(do_graph)
 957                                         printf("}\n");
 958                                 return 0;
 959                         }
 960                 }
 961                 if(n < 2)
 962                         break;
 963
 964                 char node[4096];
 965                 char from[4096];
 966                 char to[4096];
 967                 char subnet[4096];
 968                 char host[4096];
 969                 char port[4096];
 970                 char via[4096];
 971                 char nexthop[4096];
 972                 int cipher, digest, maclength, compression, distance, socket, weight;
 973                 short int pmtu, minmtu, maxmtu;
 974                 unsigned int options, status_int;
 975                 node_status_t status;
 976                 long int last_state_change;
 977
 978                 switch(req) {
 979                         case REQ_DUMP_NODES: {
 980                                 int n = sscanf(line, "%*d %*d %s %s port %s %d %d %d %d %x %x %s %s %d %hd %hd %hd %ld", node, host, port, &cipher, &digest, &maclength, &compression, &options, &status_int, nexthop, via, &distance, &pmtu, &minmtu, &maxmtu, &last_state_change);
 981                                 if(n != 16) {
 982                                         fprintf(stderr, "Unable to parse node dump from tincd: %s\n", line);
 983                                         return 1;
 984                                 }
 985
 986                                 memcpy(&status, &status_int, sizeof status);
 987
 988                                 if(do_graph) {
 989                                         const char *color = "black";
 990                                         if(!strcmp(host, "MYSELF"))
 991                                                 color = "green";
 992                                         else if(!status.reachable)
 993                                                 color = "red";
 994                                         else if(strcmp(via, node))
 995                                                 color = "orange";
 996                                         else if(!status.validkey)
 997                                                 color = "black";
 998                                         else if(minmtu > 0)
 999                                                 color = "green";
1000                                         printf(" %s [label = \"%s\", color = \"%s\"%s];\n", node, node, color, strcmp(host, "MYSELF") ? "" : ", style = \"filled\"");
1001                                 } else {
1002                                         if(only_reachable && !status.reachable)
1003                                                 continue;
1004                                         printf("%s at %s port %s cipher %d digest %d maclength %d compression %d options %x status %04x nexthop %s via %s distance %d pmtu %hd (min %hd max %hd)\n",
1005                                                         node, host, port, cipher, digest, maclength, compression, options, status_int, nexthop, via, distance, pmtu, minmtu, maxmtu);
1006                                 }
1007                         } break;
1008
1009                         case REQ_DUMP_EDGES: {
1010                                 int n = sscanf(line, "%*d %*d %s %s %s port %s %x %d", from, to, host, port, &options, &weight);
1011                                 if(n != 6) {
1012                                         fprintf(stderr, "Unable to parse edge dump from tincd.\n");
1013                                         return 1;
1014                                 }
1015
1016                                 if(do_graph) {
1017                                         float w = 1 + 65536.0 / weight;
1018                                         if(do_graph == 1 && strcmp(node1, node2) > 0)
1019                                                 printf(" %s -- %s [w = %f, weight = %f];\n", node1, node2, w, w);
1020                                         else if(do_graph == 2)
1021                                                 printf(" %s -> %s [w = %f, weight = %f];\n", node1, node2, w, w);
1022                                 } else {
1023                                         printf("%s to %s at %s port %s options %x weight %d\n", from, to, host, port, options, weight);
1024                                 }
1025                         } break;
1026
1027                         case REQ_DUMP_SUBNETS: {
1028                                 int n = sscanf(line, "%*d %*d %s %s", subnet, node);
1029                                 if(n != 2) {
1030                                         fprintf(stderr, "Unable to parse subnet dump from tincd.\n");
1031                                         return 1;
1032                                 }
1033                                 printf("%s owner %s\n", strip_weight(subnet), node);
1034                         } break;
1035
1036                         case REQ_DUMP_CONNECTIONS: {
1037                                 int n = sscanf(line, "%*d %*d %s %s port %s %x %d %x", node, host, port, &options, &socket, &status_int);
1038                                 if(n != 6) {
1039                                         fprintf(stderr, "Unable to parse connection dump from tincd.\n");
1040                                         return 1;
1041                                 }
1042                                 printf("%s at %s port %s options %x socket %d status %x\n", node, host, port, options, socket, status_int);
1043                         } break;
1044
1045                         default:
1046                                 fprintf(stderr, "Unable to parse dump from tincd.\n");
1047                                 return 1;
1048                 }
1049         }
1050
1051         fprintf(stderr, "Error receiving dump.\n");
1052         return 1;
1053 }
1054
1055 static int cmd_purge(int argc, char *argv[]) {
1056         if(argc > 1) {
1057                 fprintf(stderr, "Too many arguments!\n");
1058                 return 1;
1059         }
1060
1061         if(!connect_tincd(true))
1062                 return 1;
1063
1064         sendline(fd, "%d %d", CONTROL, REQ_PURGE);
1065         if(!recvline(fd, line, sizeof line) || sscanf(line, "%d %d %d", &code, &req, &result) != 3 || code != CONTROL || req != REQ_PURGE || result) {
1066                 fprintf(stderr, "Could not purge old information.\n");
1067                 return 1;
1068         }
1069
1070         return 0;
1071 }
1072
1073 static int cmd_debug(int argc, char *argv[]) {
1074         if(argc != 2) {
1075                 fprintf(stderr, "Invalid number of arguments.\n");
1076                 return 1;
1077         }
1078
1079         if(!connect_tincd(true))
1080                 return 1;
1081
1082         int debuglevel = atoi(argv[1]);
1083         int origlevel;
1084
1085         sendline(fd, "%d %d %d", CONTROL, REQ_SET_DEBUG, debuglevel);
1086         if(!recvline(fd, line, sizeof line) || sscanf(line, "%d %d %d", &code, &req, &origlevel) != 3 || code != CONTROL || req != REQ_SET_DEBUG) {
1087                 fprintf(stderr, "Could not set debug level.\n");
1088                 return 1;
1089         }
1090
1091         fprintf(stderr, "Old level %d, new level %d.\n", origlevel, debuglevel);
1092         return 0;
1093 }
1094
1095 static int cmd_retry(int argc, char *argv[]) {
1096         if(argc > 1) {
1097                 fprintf(stderr, "Too many arguments!\n");
1098                 return 1;
1099         }
1100
1101         if(!connect_tincd(true))
1102                 return 1;
1103
1104         sendline(fd, "%d %d", CONTROL, REQ_RETRY);
1105         if(!recvline(fd, line, sizeof line) || sscanf(line, "%d %d %d", &code, &req, &result) != 3 || code != CONTROL || req != REQ_RETRY || result) {
1106                 fprintf(stderr, "Could not retry outgoing connections.\n");
1107                 return 1;
1108         }
1109
1110         return 0;
1111 }
1112
1113 static int cmd_connect(int argc, char *argv[]) {
1114         if(argc != 2) {
1115                 fprintf(stderr, "Invalid number of arguments.\n");
1116                 return 1;
1117         }
1118
1119         if(!check_id(argv[1])) {
1120                 fprintf(stderr, "Invalid name for node.\n");
1121                 return 1;
1122         }
1123
1124         if(!connect_tincd(true))
1125                 return 1;
1126
1127         sendline(fd, "%d %d %s", CONTROL, REQ_CONNECT, argv[1]);
1128         if(!recvline(fd, line, sizeof line) || sscanf(line, "%d %d %d", &code, &req, &result) != 3 || code != CONTROL || req != REQ_CONNECT || result) {
1129                 fprintf(stderr, "Could not connect to %s.\n", argv[1]);
1130                 return 1;
1131         }
1132
1133         return 0;
1134 }
1135
1136 static int cmd_disconnect(int argc, char *argv[]) {
1137         if(argc != 2) {
1138                 fprintf(stderr, "Invalid number of arguments.\n");
1139                 return 1;
1140         }
1141
1142         if(!check_id(argv[1])) {
1143                 fprintf(stderr, "Invalid name for node.\n");
1144                 return 1;
1145         }
1146
1147         if(!connect_tincd(true))
1148                 return 1;
1149
1150         sendline(fd, "%d %d %s", CONTROL, REQ_DISCONNECT, argv[1]);
1151         if(!recvline(fd, line, sizeof line) || sscanf(line, "%d %d %d", &code, &req, &result) != 3 || code != CONTROL || req != REQ_DISCONNECT || result) {
1152                 fprintf(stderr, "Could not disconnect %s.\n", argv[1]);
1153                 return 1;
1154         }
1155
1156         return 0;
1157 }
1158
1159 static int cmd_top(int argc, char *argv[]) {
1160         if(argc > 1) {
1161                 fprintf(stderr, "Too many arguments!\n");
1162                 return 1;
1163         }
1164
1165 #ifdef HAVE_CURSES
1166         if(!connect_tincd(true))
1167                 return 1;
1168
1169         top(fd);
1170         return 0;
1171 #else
1172         fprintf(stderr, "This version of tinc was compiled without support for the curses library.\n");
1173         return 1;
1174 #endif
1175 }
1176
1177 static int cmd_pcap(int argc, char *argv[]) {
1178         if(argc > 2) {
1179                 fprintf(stderr, "Too many arguments!\n");
1180                 return 1;
1181         }
1182
1183         if(!connect_tincd(true))
1184                 return 1;
1185
1186         pcap(fd, stdout, argc > 1 ? atoi(argv[1]) : 0);
1187         return 0;
1188 }
1189
1190 #ifdef SIGINT
1191 static void sigint_handler(int sig) {
1192         fprintf(stderr, "\n");
1193         shutdown(fd, SHUT_RDWR);
1194 }
1195 #endif
1196
1197 static int cmd_log(int argc, char *argv[]) {
1198         if(argc > 2) {
1199                 fprintf(stderr, "Too many arguments!\n");
1200                 return 1;
1201         }
1202
1203         if(!connect_tincd(true))
1204                 return 1;
1205
1206 #ifdef SIGINT
1207         signal(SIGINT, sigint_handler);
1208 #endif
1209
1210         logcontrol(fd, stdout, argc > 1 ? atoi(argv[1]) : -1);
1211
1212 #ifdef SIGINT
1213         signal(SIGINT, SIG_DFL);
1214 #endif
1215
1216         close(fd);
1217         fd = -1;
1218         return 0;
1219 }
1220
1221 static int cmd_pid(int argc, char *argv[]) {
1222         if(argc > 1) {
1223                 fprintf(stderr, "Too many arguments!\n");
1224                 return 1;
1225         }
1226
1227         if(!connect_tincd(true) && !pid)
1228                 return 1;
1229
1230         printf("%d\n", pid);
1231         return 0;
1232 }
1233
1234 int rstrip(char *value) {
1235         int len = strlen(value);
1236         while(len && strchr("\t\r\n ", value[len - 1]))
1237                 value[--len] = 0;
1238         return len;
1239 }
1240
1241 char *get_my_name(bool verbose) {
1242         FILE *f = fopen(tinc_conf, "r");
1243         if(!f) {
1244                 if(verbose)
1245                         fprintf(stderr, "Could not open %s: %s\n", tinc_conf, strerror(errno));
1246                 return NULL;
1247         }
1248
1249         char buf[4096];
1250         char *value;
1251         while(fgets(buf, sizeof buf, f)) {
1252                 int len = strcspn(buf, "\t =");
1253                 value = buf + len;
1254                 value += strspn(value, "\t ");
1255                 if(*value == '=') {
1256                         value++;
1257                         value += strspn(value, "\t ");
1258                 }
1259                 if(!rstrip(value))
1260                         continue;
1261                 buf[len] = 0;
1262                 if(strcasecmp(buf, "Name"))
1263                         continue;
1264                 if(*value) {
1265                         fclose(f);
1266                         return strdup(value);
1267                 }
1268         }
1269
1270         fclose(f);
1271         if(verbose)
1272                 fprintf(stderr, "Could not find Name in %s.\n", tinc_conf);
1273         return NULL;
1274 }
1275
1276 const var_t variables[] = {
1277         /* Server configuration */
1278         {"AddressFamily", VAR_SERVER},
1279         {"AutoConnect", VAR_SERVER | VAR_SAFE},
1280         {"BindToAddress", VAR_SERVER | VAR_MULTIPLE},
1281         {"BindToInterface", VAR_SERVER},
1282         {"Broadcast", VAR_SERVER | VAR_SAFE},
1283         {"ConnectTo", VAR_SERVER | VAR_MULTIPLE | VAR_SAFE},
1284         {"DecrementTTL", VAR_SERVER},
1285         {"Device", VAR_SERVER},
1286         {"DeviceType", VAR_SERVER},
1287         {"DirectOnly", VAR_SERVER},
1288         {"ECDSAPrivateKeyFile", VAR_SERVER},
1289         {"ExperimentalProtocol", VAR_SERVER},
1290         {"Forwarding", VAR_SERVER},
1291         {"GraphDumpFile", VAR_SERVER | VAR_OBSOLETE},
1292         {"Hostnames", VAR_SERVER},
1293         {"IffOneQueue", VAR_SERVER},
1294         {"Interface", VAR_SERVER},
1295         {"KeyExpire", VAR_SERVER},
1296         {"ListenAddress", VAR_SERVER | VAR_MULTIPLE},
1297         {"LocalDiscovery", VAR_SERVER},
1298         {"MACExpire", VAR_SERVER},
1299         {"MaxConnectionBurst", VAR_SERVER},
1300         {"MaxOutputBufferSize", VAR_SERVER},
1301         {"MaxTimeout", VAR_SERVER},
1302         {"Mode", VAR_SERVER | VAR_SAFE},
1303         {"Name", VAR_SERVER},
1304         {"PingInterval", VAR_SERVER},
1305         {"PingTimeout", VAR_SERVER},
1306         {"PriorityInheritance", VAR_SERVER},
1307         {"PrivateKey", VAR_SERVER | VAR_OBSOLETE},
1308         {"PrivateKeyFile", VAR_SERVER},
1309         {"ProcessPriority", VAR_SERVER},
1310         {"Proxy", VAR_SERVER},
1311         {"ReplayWindow", VAR_SERVER},
1312         {"ScriptsExtension", VAR_SERVER},
1313         {"ScriptsInterpreter", VAR_SERVER},
1314         {"StrictSubnets", VAR_SERVER},
1315         {"TunnelServer", VAR_SERVER},
1316         {"UDPRcvBuf", VAR_SERVER},
1317         {"UDPSndBuf", VAR_SERVER},
1318         {"VDEGroup", VAR_SERVER},
1319         {"VDEPort", VAR_SERVER},
1320         /* Host configuration */
1321         {"Address", VAR_HOST | VAR_MULTIPLE},
1322         {"Cipher", VAR_SERVER | VAR_HOST},
1323         {"ClampMSS", VAR_SERVER | VAR_HOST},
1324         {"Compression", VAR_SERVER | VAR_HOST},
1325         {"Digest", VAR_SERVER | VAR_HOST},
1326         {"ECDSAPublicKey", VAR_HOST},
1327         {"ECDSAPublicKeyFile", VAR_SERVER | VAR_HOST},
1328         {"IndirectData", VAR_SERVER | VAR_HOST},
1329         {"MACLength", VAR_SERVER | VAR_HOST},
1330         {"PMTU", VAR_SERVER | VAR_HOST},
1331         {"PMTUDiscovery", VAR_SERVER | VAR_HOST},
1332         {"Port", VAR_HOST},
1333         {"PublicKey", VAR_HOST | VAR_OBSOLETE},
1334         {"PublicKeyFile", VAR_SERVER | VAR_HOST | VAR_OBSOLETE},
1335         {"Subnet", VAR_HOST | VAR_MULTIPLE | VAR_SAFE},
1336         {"TCPOnly", VAR_SERVER | VAR_HOST},
1337         {"Weight", VAR_HOST | VAR_SAFE},
1338         {NULL, 0}
1339 };
1340
1341 static int cmd_config(int argc, char *argv[]) {
1342         if(argc < 2) {
1343                 fprintf(stderr, "Invalid number of arguments.\n");
1344                 return 1;
1345         }
1346
1347         if(strcasecmp(argv[0], "config"))
1348                 argv--, argc++;
1349
1350         int action = -2;
1351         if(!strcasecmp(argv[1], "get")) {
1352                 argv++, argc--;
1353         } else if(!strcasecmp(argv[1], "add")) {
1354                 argv++, argc--, action = 1;
1355         } else if(!strcasecmp(argv[1], "del")) {
1356                 argv++, argc--, action = -1;
1357         } else if(!strcasecmp(argv[1], "replace") || !strcasecmp(argv[1], "set") || !strcasecmp(argv[1], "change")) {
1358                 argv++, argc--, action = 0;
1359         }
1360
1361         if(argc < 2) {
1362                 fprintf(stderr, "Invalid number of arguments.\n");
1363                 return 1;
1364         }
1365
1366         // Concatenate the rest of the command line
1367         strncpy(line, argv[1], sizeof line - 1);
1368         for(int i = 2; i < argc; i++) {
1369                 strncat(line, " ", sizeof line - 1 - strlen(line));
1370                 strncat(line, argv[i], sizeof line - 1 - strlen(line));
1371         }
1372
1373         // Liberal parsing into node name, variable name and value.
1374         char *node = NULL;
1375         char *variable;
1376         char *value;
1377         int len;
1378
1379         len = strcspn(line, "\t =");
1380         value = line + len;
1381         value += strspn(value, "\t ");
1382         if(*value == '=') {
1383                 value++;
1384                 value += strspn(value, "\t ");
1385         }
1386         line[len] = '\0';
1387         variable = strchr(line, '.');
1388         if(variable) {
1389                 node = line;
1390                 *variable++ = 0;
1391         } else {
1392                 variable = line;
1393         }
1394
1395         if(!*variable) {
1396                 fprintf(stderr, "No variable given.\n");
1397                 return 1;
1398         }
1399
1400         if(action >= 0 && !*value) {
1401                 fprintf(stderr, "No value for variable given.\n");
1402                 return 1;
1403         }
1404
1405         if(action < -1 && *value)
1406                 action = 0;
1407
1408         /* Some simple checks. */
1409         bool found = false;
1410         bool warnonremove = false;
1411
1412         for(int i = 0; variables[i].name; i++) {
1413                 if(strcasecmp(variables[i].name, variable))
1414                         continue;
1415
1416                 found = true;
1417                 variable = (char *)variables[i].name;
1418
1419                 /* Discourage use of obsolete variables. */
1420
1421                 if(variables[i].type & VAR_OBSOLETE && action >= 0) {
1422                         if(force) {
1423                                 fprintf(stderr, "Warning: %s is an obsolete variable!\n", variable);
1424                         } else {
1425                                 fprintf(stderr, "%s is an obsolete variable! Use --force to use it anyway.\n", variable);
1426                                 return 1;
1427                         }
1428                 }
1429
1430                 /* Don't put server variables in host config files */
1431
1432                 if(node && !(variables[i].type & VAR_HOST) && action >= 0) {
1433                         if(force) {
1434                                 fprintf(stderr, "Warning: %s is not a host configuration variable!\n", variable);
1435                         } else {
1436                                 fprintf(stderr, "%s is not a host configuration variable! Use --force to use it anyway.\n", variable);
1437                                 return 1;
1438                         }
1439                 }
1440
1441                 /* Should this go into our own host config file? */
1442
1443                 if(!node && !(variables[i].type & VAR_SERVER)) {
1444                         node = get_my_name(true);
1445                         if(!node)
1446                                 return 1;
1447                 }
1448
1449                 /* Change "add" into "set" for variables that do not allow multiple occurences.
1450                    Turn on warnings when it seems variables might be removed unintentionally. */
1451
1452                 if(action == 1 && !(variables[i].type & VAR_MULTIPLE)) {
1453                         warnonremove = true;
1454                         action = 0;
1455                 } else if(action == 0 && (variables[i].type & VAR_MULTIPLE)) {
1456                         warnonremove = true;
1457                 }
1458
1459                 break;
1460         }
1461
1462         if(node && !check_id(node)) {
1463                 fprintf(stderr, "Invalid name for node.\n");
1464                 return 1;
1465         }
1466
1467         if(!found) {
1468                 if(force || action < 0) {
1469                         fprintf(stderr, "Warning: %s is not a known configuration variable!\n", variable);
1470                 } else {
1471                         fprintf(stderr, "%s: is not a known configuration variable! Use --force to use it anyway.\n", variable);
1472                         return 1;
1473                 }
1474         }
1475
1476         // Open the right configuration file.
1477         char *filename;
1478         if(node)
1479                 xasprintf(&filename, "%s" SLASH "%s", hosts_dir, node);
1480         else
1481                 filename = tinc_conf;
1482
1483         FILE *f = fopen(filename, "r");
1484         if(!f) {
1485                 fprintf(stderr, "Could not open configuration file %s: %s\n", filename, strerror(errno));
1486                 return 1;
1487         }
1488
1489         char *tmpfile = NULL;
1490         FILE *tf = NULL;
1491
1492         if(action >= -1) {
1493                 xasprintf(&tmpfile, "%s.config.tmp", filename);
1494                 tf = fopen(tmpfile, "w");
1495                 if(!tf) {
1496                         fprintf(stderr, "Could not open temporary file %s: %s\n", tmpfile, strerror(errno));
1497                         fclose(f);
1498                         return 1;
1499                 }
1500         }
1501
1502         // Copy the file, making modifications on the fly, unless we are just getting a value.
1503         char buf1[4096];
1504         char buf2[4096];
1505         bool set = false;
1506         bool removed = false;
1507         found = false;
1508
1509         while(fgets(buf1, sizeof buf1, f)) {
1510                 buf1[sizeof buf1 - 1] = 0;
1511                 strncpy(buf2, buf1, sizeof buf2);
1512
1513                 // Parse line in a simple way
1514                 char *bvalue;
1515                 int len;
1516
1517                 len = strcspn(buf2, "\t =");
1518                 bvalue = buf2 + len;
1519                 bvalue += strspn(bvalue, "\t ");
1520                 if(*bvalue == '=') {
1521                         bvalue++;
1522                         bvalue += strspn(bvalue, "\t ");
1523                 }
1524                 rstrip(bvalue);
1525                 buf2[len] = '\0';
1526
1527                 // Did it match?
1528                 if(!strcasecmp(buf2, variable)) {
1529                         // Get
1530                         if(action < -1) {
1531                                 found = true;
1532                                 printf("%s\n", bvalue);
1533                         // Del
1534                         } else if(action == -1) {
1535                                 if(!*value || !strcasecmp(bvalue, value)) {
1536                                         removed = true;
1537                                         continue;
1538                                 }
1539                         // Set
1540                         } else if(action == 0) {
1541                                 // Warn if "set" was used for variables that can occur multiple times
1542                                 if(warnonremove && strcasecmp(bvalue, value))
1543                                         fprintf(stderr, "Warning: removing %s = %s\n", variable, bvalue);
1544
1545                                 // Already set? Delete the rest...
1546                                 if(set)
1547                                         continue;
1548
1549                                 // Otherwise, replace.
1550                                 if(fprintf(tf, "%s = %s\n", variable, value) < 0) {
1551                                         fprintf(stderr, "Error writing to temporary file %s: %s\n", tmpfile, strerror(errno));
1552                                         return 1;
1553                                 }
1554                                 set = true;
1555                                 continue;
1556                         }
1557                 }
1558
1559                 if(action >= -1) {
1560                         // Copy original line...
1561                         if(fputs(buf1, tf) < 0) {
1562                                 fprintf(stderr, "Error writing to temporary file %s: %s\n", tmpfile, strerror(errno));
1563                                 return 1;
1564                         }
1565
1566                         // Add newline if it is missing...
1567                         if(*buf1 && buf1[strlen(buf1) - 1] != '\n') {
1568                                 if(fputc('\n', tf) < 0) {
1569                                         fprintf(stderr, "Error writing to temporary file %s: %s\n", tmpfile, strerror(errno));
1570                                         return 1;
1571                                 }
1572                         }
1573                 }
1574         }
1575
1576         // Make sure we read everything...
1577         if(ferror(f) || !feof(f)) {
1578                 fprintf(stderr, "Error while reading from configuration file %s: %s\n", filename, strerror(errno));
1579                 return 1;
1580         }
1581
1582         if(fclose(f)) {
1583                 fprintf(stderr, "Error closing configuration file %s: %s\n", filename, strerror(errno));
1584                 return 1;
1585         }
1586
1587         // Add new variable if necessary.
1588         if(action > 0 || (action == 0 && !set)) {
1589                 if(fprintf(tf, "%s = %s\n", variable, value) < 0) {
1590                         fprintf(stderr, "Error writing to temporary file %s: %s\n", tmpfile, strerror(errno));
1591                         return 1;
1592                 }
1593         }
1594
1595         if(action < -1) {
1596                 if(!found)
1597                         fprintf(stderr, "No matching configuration variables found.\n");
1598                 return 0;
1599         }
1600
1601         // Make sure we wrote everything...
1602         if(fclose(tf)) {
1603                 fprintf(stderr, "Error closing temporary file %s: %s\n", tmpfile, strerror(errno));
1604                 return 1;
1605         }
1606
1607         // Could we find what we had to remove?
1608         if(action < 0 && !removed) {
1609                 remove(tmpfile);
1610                 fprintf(stderr, "No configuration variables deleted.\n");
1611                 return *value != 0;
1612         }
1613
1614         // Replace the configuration file with the new one
1615 #ifdef HAVE_MINGW
1616         if(remove(filename)) {
1617                 fprintf(stderr, "Error replacing file %s: %s\n", filename, strerror(errno));
1618                 return 1;
1619         }
1620 #endif
1621         if(rename(tmpfile, filename)) {
1622                 fprintf(stderr, "Error renaming temporary file %s to configuration file %s: %s\n", tmpfile, filename, strerror(errno));
1623                 return 1;
1624         }
1625
1626         // Silently try notifying a running tincd of changes.
1627         if(connect_tincd(false))
1628                 sendline(fd, "%d %d", CONTROL, REQ_RELOAD);
1629
1630         return 0;
1631 }
1632
1633 bool check_id(const char *name) {
1634         if(!name || !*name)
1635                 return false;
1636
1637         for(int i = 0; i < strlen(name); i++) {
1638                 if(!isalnum(name[i]) && name[i] != '_')
1639                         return false;
1640         }
1641
1642         return true;
1643 }
1644
1645 static bool try_bind(int port) {
1646         struct addrinfo *ai = NULL;
1647         struct addrinfo hint = {
1648                 .ai_flags = AI_PASSIVE,
1649                 .ai_family = AF_UNSPEC,
1650                 .ai_socktype = SOCK_STREAM,
1651                 .ai_protocol = IPPROTO_TCP,
1652         };
1653
1654         char portstr[16];
1655         snprintf(portstr, sizeof portstr, "%d", port);
1656
1657         if(getaddrinfo(NULL, portstr, &hint, &ai) || !ai)
1658                 return false;
1659
1660         while(ai) {
1661                 int fd = socket(ai->ai_family, SOCK_STREAM, IPPROTO_TCP);
1662                 if(!fd)
1663                         return false;
1664                 int result = bind(fd, ai->ai_addr, ai->ai_addrlen);
1665                 closesocket(fd);
1666                 if(result)
1667                         return false;
1668                 ai = ai->ai_next;
1669         }
1670
1671         return true;
1672 }
1673
1674 int check_port(char *name) {
1675         if(try_bind(655))
1676                 return 655;
1677
1678         fprintf(stderr, "Warning: could not bind to port 655. ");
1679
1680         for(int i = 0; i < 100; i++) {
1681                 int port = 0x1000 + (rand() & 0x7fff);
1682                 if(try_bind(port)) {
1683                         char *filename;
1684                         xasprintf(&filename, "%s" SLASH "hosts" SLASH "%s", confbase, name);
1685                         FILE *f = fopen(filename, "a");
1686                         free(filename);
1687                         if(!f) {
1688                                 fprintf(stderr, "Please change tinc's Port manually.\n");
1689                                 return 0;
1690                         }
1691
1692                         fprintf(f, "Port = %d\n", port);
1693                         fclose(f);
1694                         fprintf(stderr, "Tinc will instead listen on port %d.\n", port);
1695                         return port;
1696                 }
1697         }
1698
1699         fprintf(stderr, "Please change tinc's Port manually.\n");
1700         return 0;
1701 }
1702
1703 static int cmd_init(int argc, char *argv[]) {
1704         if(!access(tinc_conf, F_OK)) {
1705                 fprintf(stderr, "Configuration file %s already exists!\n", tinc_conf);
1706                 return 1;
1707         }
1708
1709         if(argc > 2) {
1710                 fprintf(stderr, "Too many arguments!\n");
1711                 return 1;
1712         } else if(argc < 2) {
1713                 if(tty) {
1714                         char buf[1024];
1715                         fprintf(stderr, "Enter the Name you want your tinc node to have: ");
1716                         if(!fgets(buf, sizeof buf, stdin)) {
1717                                 fprintf(stderr, "Error while reading stdin: %s\n", strerror(errno));
1718                                 return 1;
1719                         }
1720                         int len = rstrip(buf);
1721                         if(!len) {
1722                                 fprintf(stderr, "No name given!\n");
1723                                 return 1;
1724                         }
1725                         name = strdup(buf);
1726                 } else {
1727                         fprintf(stderr, "No Name given!\n");
1728                         return 1;
1729                 }
1730         } else {
1731                 name = strdup(argv[1]);
1732                 if(!*name) {
1733                         fprintf(stderr, "No Name given!\n");
1734                         return 1;
1735                 }
1736         }
1737
1738         if(!check_id(name)) {
1739                 fprintf(stderr, "Invalid Name! Only a-z, A-Z, 0-9 and _ are allowed characters.\n");
1740                 return 1;
1741         }
1742
1743         if(!confbase_given && mkdir(confdir, 0755) && errno != EEXIST) {
1744                 fprintf(stderr, "Could not create directory %s: %s\n", confdir, strerror(errno));
1745                 return 1;
1746         }
1747
1748         if(mkdir(confbase, 0777) && errno != EEXIST) {
1749                 fprintf(stderr, "Could not create directory %s: %s\n", confbase, strerror(errno));
1750                 return 1;
1751         }
1752
1753         if(mkdir(hosts_dir, 0777) && errno != EEXIST) {
1754                 fprintf(stderr, "Could not create directory %s: %s\n", hosts_dir, strerror(errno));
1755                 return 1;
1756         }
1757
1758         FILE *f = fopen(tinc_conf, "w");
1759         if(!f) {
1760                 fprintf(stderr, "Could not create file %s: %s\n", tinc_conf, strerror(errno));
1761                 return 1;
1762         }
1763
1764         fprintf(f, "Name = %s\n", name);
1765         fclose(f);
1766
1767         if(!rsa_keygen(2048, false) || !ecdsa_keygen(false))
1768                 return 1;
1769
1770         check_port(name);
1771
1772 #ifndef HAVE_MINGW
1773         char *filename;
1774         xasprintf(&filename, "%s" SLASH "tinc-up", confbase);
1775         if(access(filename, F_OK)) {
1776                 FILE *f = fopenmask(filename, "w", 0777);
1777                 if(!f) {
1778                         fprintf(stderr, "Could not create file %s: %s\n", filename, strerror(errno));
1779                         return 1;
1780                 }
1781                 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");
1782                 fclose(f);
1783         }
1784 #endif
1785
1786         return 0;
1787
1788 }
1789
1790 static int cmd_generate_keys(int argc, char *argv[]) {
1791         if(argc > 2) {
1792                 fprintf(stderr, "Too many arguments!\n");
1793                 return 1;
1794         }
1795
1796         if(!name)
1797                 name = get_my_name(false);
1798
1799         return !(rsa_keygen(argc > 1 ? atoi(argv[1]) : 2048, true) && ecdsa_keygen(true));
1800 }
1801
1802 static int cmd_generate_rsa_keys(int argc, char *argv[]) {
1803         if(argc > 2) {
1804                 fprintf(stderr, "Too many arguments!\n");
1805                 return 1;
1806         }
1807
1808         if(!name)
1809                 name = get_my_name(false);
1810
1811         return !rsa_keygen(argc > 1 ? atoi(argv[1]) : 2048, true);
1812 }
1813
1814 static int cmd_generate_ecdsa_keys(int argc, char *argv[]) {
1815         if(argc > 1) {
1816                 fprintf(stderr, "Too many arguments!\n");
1817                 return 1;
1818         }
1819
1820         if(!name)
1821                 name = get_my_name(false);
1822
1823         return !ecdsa_keygen(true);
1824 }
1825
1826 static int cmd_help(int argc, char *argv[]) {
1827         usage(false);
1828         return 0;
1829 }
1830
1831 static int cmd_version(int argc, char *argv[]) {
1832         if(argc > 1) {
1833                 fprintf(stderr, "Too many arguments!\n");
1834                 return 1;
1835         }
1836
1837         version();
1838         return 0;
1839 }
1840
1841 static int cmd_info(int argc, char *argv[]) {
1842         if(argc != 2) {
1843                 fprintf(stderr, "Invalid number of arguments.\n");
1844                 return 1;
1845         }
1846
1847         if(!connect_tincd(true))
1848                 return 1;
1849
1850         return info(fd, argv[1]);
1851 }
1852
1853 static const char *conffiles[] = {
1854         "tinc.conf",
1855         "tinc-up",
1856         "tinc-down",
1857         "subnet-up",
1858         "subnet-down",
1859         "host-up",
1860         "host-down",
1861         NULL,
1862 };
1863
1864 static int cmd_edit(int argc, char *argv[]) {
1865         if(argc != 2) {
1866                 fprintf(stderr, "Invalid number of arguments.\n");
1867                 return 1;
1868         }
1869
1870         char *filename = NULL;
1871
1872         if(strncmp(argv[1], "hosts" SLASH, 6)) {
1873                 for(int i = 0; conffiles[i]; i++) {
1874                         if(!strcmp(argv[1], conffiles[i])) {
1875                                 xasprintf(&filename, "%s" SLASH "%s", confbase, argv[1]);
1876                                 break;
1877                         }
1878                 }
1879         } else {
1880                 argv[1] += 6;
1881         }
1882
1883         if(!filename) {
1884                 xasprintf(&filename, "%s" SLASH "%s", hosts_dir, argv[1]);
1885                 char *dash = strchr(argv[1], '-');
1886                 if(dash) {
1887                         *dash++ = 0;
1888                         if((strcmp(dash, "up") && strcmp(dash, "down")) || !check_id(argv[1])) {
1889                                 fprintf(stderr, "Invalid configuration filename.\n");
1890                                 return 1;
1891                         }
1892                 }
1893         }
1894
1895         char *command;
1896 #ifndef HAVE_MINGW
1897         xasprintf(&command, "\"%s\" \"%s\"", getenv("VISUAL") ?: getenv("EDITOR") ?: "vi", filename);
1898 #else
1899         xasprintf(&command, "edit \"%s\"", filename);
1900 #endif
1901         int result = system(command);
1902         if(result)
1903                 return result;
1904
1905         // Silently try notifying a running tincd of changes.
1906         if(connect_tincd(false))
1907                 sendline(fd, "%d %d", CONTROL, REQ_RELOAD);
1908
1909         return 0;
1910 }
1911
1912 static int export(const char *name, FILE *out) {
1913         char *filename;
1914         xasprintf(&filename, "%s" SLASH "%s", hosts_dir, name);
1915         FILE *in = fopen(filename, "r");
1916         if(!in) {
1917                 fprintf(stderr, "Could not open configuration file %s: %s\n", filename, strerror(errno));
1918                 return 1;
1919         }
1920
1921         fprintf(out, "Name = %s\n", name);
1922         char buf[4096];
1923         while(fgets(buf, sizeof buf, in)) {
1924                 if(strcspn(buf, "\t =") != 4 || strncasecmp(buf, "Name", 4))
1925                         fputs(buf, out);
1926         }
1927
1928         if(ferror(in)) {
1929                 fprintf(stderr, "Error while reading configuration file %s: %s\n", filename, strerror(errno));
1930                 fclose(in);
1931                 return 1;
1932         }
1933
1934         fclose(in);
1935         return 0;
1936 }
1937
1938 static int cmd_export(int argc, char *argv[]) {
1939         if(argc > 1) {
1940                 fprintf(stderr, "Too many arguments!\n");
1941                 return 1;
1942         }
1943
1944         char *name = get_my_name(true);
1945         if(!name)
1946                 return 1;
1947
1948         int result = export(name, stdout);
1949         if(!tty)
1950                 fclose(stdout);
1951
1952         free(name);
1953         return result;
1954 }
1955
1956 static int cmd_export_all(int argc, char *argv[]) {
1957         if(argc > 1) {
1958                 fprintf(stderr, "Too many arguments!\n");
1959                 return 1;
1960         }
1961
1962         DIR *dir = opendir(hosts_dir);
1963         if(!dir) {
1964                 fprintf(stderr, "Could not open host configuration directory %s: %s\n", hosts_dir, strerror(errno));
1965                 return 1;
1966         }
1967
1968         bool first = true;
1969         int result = 0;
1970         struct dirent *ent;
1971
1972         while((ent = readdir(dir))) {
1973                 if(!check_id(ent->d_name))
1974                         continue;
1975
1976                 if(first)
1977                         first = false;
1978                 else
1979                         printf("#---------------------------------------------------------------#\n");
1980
1981                 result |= export(ent->d_name, stdout);
1982         }
1983
1984         closedir(dir);
1985         if(!tty)
1986                 fclose(stdout);
1987         return result;
1988 }
1989
1990 static int cmd_import(int argc, char *argv[]) {
1991         if(argc > 1) {
1992                 fprintf(stderr, "Too many arguments!\n");
1993                 return 1;
1994         }
1995
1996         FILE *in = stdin;
1997         FILE *out = NULL;
1998
1999         char buf[4096];
2000         char name[4096];
2001         char *filename = NULL;
2002         int count = 0;
2003         bool firstline = true;
2004
2005         while(fgets(buf, sizeof buf, in)) {
2006                 if(sscanf(buf, "Name = %s", name) == 1) {
2007                         firstline = false;
2008
2009                         if(!check_id(name)) {
2010                                 fprintf(stderr, "Invalid Name in input!\n");
2011                                 return 1;
2012                         }
2013
2014                         if(out)
2015                                 fclose(out);
2016
2017                         free(filename);
2018                         xasprintf(&filename, "%s" SLASH "%s", hosts_dir, name);
2019
2020                         if(!force && !access(filename, F_OK)) {
2021                                 fprintf(stderr, "Host configuration file %s already exists, skipping.\n", filename);
2022                                 out = NULL;
2023                                 continue;
2024                         }
2025
2026                         out = fopen(filename, "w");
2027                         if(!out) {
2028                                 fprintf(stderr, "Error creating configuration file %s: %s\n", filename, strerror(errno));
2029                                 return 1;
2030                         }
2031
2032                         count++;
2033                         continue;
2034                 } else if(firstline) {
2035                         fprintf(stderr, "Junk at the beginning of the input, ignoring.\n");
2036                         firstline = false;
2037                 }
2038
2039
2040                 if(!strcmp(buf, "#---------------------------------------------------------------#\n"))
2041                         continue;
2042
2043                 if(out) {
2044                         if(fputs(buf, out) < 0) {
2045                                 fprintf(stderr, "Error writing to host configuration file %s: %s\n", filename, strerror(errno));
2046                                 return 1;
2047                         }
2048                 }
2049         }
2050
2051         if(out)
2052                 fclose(out);
2053
2054         if(count) {
2055                 fprintf(stderr, "Imported %d host configuration files.\n", count);
2056                 return 0;
2057         } else {
2058                 fprintf(stderr, "No host configuration files imported.\n");
2059                 return 1;
2060         }
2061 }
2062
2063 static int cmd_exchange(int argc, char *argv[]) {
2064         return cmd_export(argc, argv) ?: cmd_import(argc, argv);
2065 }
2066
2067 static int cmd_exchange_all(int argc, char *argv[]) {
2068         return cmd_export_all(argc, argv) ?: cmd_import(argc, argv);
2069 }
2070
2071 static int switch_network(char *name) {
2072         if(fd >= 0) {
2073                 close(fd);
2074                 fd = -1;
2075         }
2076
2077         free(confbase);
2078         confbase = NULL;
2079         free(pidfilename);
2080         pidfilename = NULL;
2081         free(logfilename);
2082         logfilename = NULL;
2083         free(unixsocketname);
2084         unixsocketname = NULL;
2085         free(tinc_conf);
2086         free(hosts_dir);
2087         free(prompt);
2088
2089         free(netname);
2090         netname = strcmp(name, ".") ? xstrdup(name) : NULL;
2091
2092         make_names();
2093         xasprintf(&tinc_conf, "%s" SLASH "tinc.conf", confbase);
2094         xasprintf(&hosts_dir, "%s" SLASH "hosts", confbase);
2095         xasprintf(&prompt, "%s> ", identname);
2096
2097         return 0;
2098 }
2099
2100 static int cmd_network(int argc, char *argv[]) {
2101         if(argc > 2) {
2102                 fprintf(stderr, "Too many arguments!\n");
2103                 return 1;
2104         }
2105
2106         if(argc == 2)
2107                 return switch_network(argv[1]);
2108
2109         DIR *dir = opendir(confdir);
2110         if(!dir) {
2111                 fprintf(stderr, "Could not read directory %s: %s\n", confdir, strerror(errno));
2112                 return 1;
2113         }
2114
2115         struct dirent *ent;
2116         while((ent = readdir(dir))) {
2117                 if(*ent->d_name == '.')
2118                         continue;
2119
2120                 if(!strcmp(ent->d_name, "tinc.conf")) {
2121                         printf(".\n");
2122                         continue;
2123                 }
2124
2125                 char *fname;
2126                 xasprintf(&fname, "%s/%s/tinc.conf", confdir, ent->d_name);
2127                 if(!access(fname, R_OK))
2128                         printf("%s\n", ent->d_name);
2129                 free(fname);
2130         }
2131
2132         return 0;
2133 }
2134
2135 static const struct {
2136         const char *command;
2137         int (*function)(int argc, char *argv[]);
2138         bool hidden;
2139 } commands[] = {
2140         {"start", cmd_start},
2141         {"stop", cmd_stop},
2142         {"restart", cmd_restart},
2143         {"reload", cmd_reload},
2144         {"dump", cmd_dump},
2145         {"purge", cmd_purge},
2146         {"debug", cmd_debug},
2147         {"retry", cmd_retry},
2148         {"connect", cmd_connect},
2149         {"disconnect", cmd_disconnect},
2150         {"top", cmd_top},
2151         {"pcap", cmd_pcap},
2152         {"log", cmd_log},
2153         {"pid", cmd_pid},
2154         {"config", cmd_config, true},
2155         {"add", cmd_config},
2156         {"del", cmd_config},
2157         {"get", cmd_config},
2158         {"set", cmd_config},
2159         {"init", cmd_init},
2160         {"generate-keys", cmd_generate_keys},
2161         {"generate-rsa-keys", cmd_generate_rsa_keys},
2162         {"generate-ecdsa-keys", cmd_generate_ecdsa_keys},
2163         {"help", cmd_help},
2164         {"version", cmd_version},
2165         {"info", cmd_info},
2166         {"edit", cmd_edit},
2167         {"export", cmd_export},
2168         {"export-all", cmd_export_all},
2169         {"import", cmd_import},
2170         {"exchange", cmd_exchange},
2171         {"exchange-all", cmd_exchange_all},
2172         {"invite", cmd_invite},
2173         {"join", cmd_join},
2174         {"network", cmd_network},
2175         {NULL, NULL},
2176 };
2177
2178 #ifdef HAVE_READLINE
2179 static char *complete_command(const char *text, int state) {
2180         static int i;
2181
2182         if(!state)
2183                 i = 0;
2184         else
2185                 i++;
2186
2187         while(commands[i].command) {
2188                 if(!commands[i].hidden && !strncasecmp(commands[i].command, text, strlen(text)))
2189                         return xstrdup(commands[i].command);
2190                 i++;
2191         }
2192
2193         return NULL;
2194 }
2195
2196 static char *complete_dump(const char *text, int state) {
2197         const char *matches[] = {"reachable", "nodes", "edges", "subnets", "connections", "graph", NULL};
2198         static int i;
2199
2200         if(!state)
2201                 i = 0;
2202         else
2203                 i++;
2204
2205         while(matches[i]) {
2206                 if(!strncasecmp(matches[i], text, strlen(text)))
2207                         return xstrdup(matches[i]);
2208                 i++;
2209         }
2210
2211         return NULL;
2212 }
2213
2214 static char *complete_config(const char *text, int state) {
2215         static int i;
2216
2217         if(!state)
2218                 i = 0;
2219         else
2220                 i++;
2221
2222         while(variables[i].name) {
2223                 char *dot = strchr(text, '.');
2224                 if(dot) {
2225                         if((variables[i].type & VAR_HOST) && !strncasecmp(variables[i].name, dot + 1, strlen(dot + 1))) {
2226                                 char *match;
2227                                 xasprintf(&match, "%.*s.%s", (int)(dot - text), text, variables[i].name);
2228                                 return match;
2229                         }
2230                 } else {
2231                         if(!strncasecmp(variables[i].name, text, strlen(text)))
2232                                 return xstrdup(variables[i].name);
2233                 }
2234                 i++;
2235         }
2236
2237         return NULL;
2238 }
2239
2240 static char *complete_info(const char *text, int state) {
2241         static int i;
2242         if(!state) {
2243                 i = 0;
2244                 if(!connect_tincd(false))
2245                         return NULL;
2246                 // Check the list of nodes
2247                 sendline(fd, "%d %d", CONTROL, REQ_DUMP_NODES);
2248                 sendline(fd, "%d %d", CONTROL, REQ_DUMP_SUBNETS);
2249         }
2250
2251         while(recvline(fd, line, sizeof line)) {
2252                 char item[4096];
2253                 int n = sscanf(line, "%d %d %s", &code, &req, item);
2254                 if(n == 2) {
2255                         i++;
2256                         if(i >= 2)
2257                                 break;
2258                         else
2259                                 continue;
2260                 }
2261
2262                 if(n != 3) {
2263                         fprintf(stderr, "Unable to parse dump from tincd, n = %d, i = %d.\n", n, i);
2264                         break;
2265                 }
2266
2267                 if(!strncmp(item, text, strlen(text)))
2268                         return xstrdup(strip_weight(item));
2269         }
2270
2271         return NULL;
2272 }
2273
2274 static char *complete_nothing(const char *text, int state) {
2275         return NULL;
2276 }
2277
2278 static char **completion (const char *text, int start, int end) {
2279         char **matches = NULL;
2280
2281         if(!start)
2282                 matches = rl_completion_matches(text, complete_command);
2283         else if(!strncasecmp(rl_line_buffer, "dump ", 5))
2284                 matches = rl_completion_matches(text, complete_dump);
2285         else if(!strncasecmp(rl_line_buffer, "add ", 4))
2286                 matches = rl_completion_matches(text, complete_config);
2287         else if(!strncasecmp(rl_line_buffer, "del ", 4))
2288                 matches = rl_completion_matches(text, complete_config);
2289         else if(!strncasecmp(rl_line_buffer, "get ", 4))
2290                 matches = rl_completion_matches(text, complete_config);
2291         else if(!strncasecmp(rl_line_buffer, "set ", 4))
2292                 matches = rl_completion_matches(text, complete_config);
2293         else if(!strncasecmp(rl_line_buffer, "info ", 5))
2294                 matches = rl_completion_matches(text, complete_info);
2295
2296         return matches;
2297 }
2298 #endif
2299
2300 static int cmd_shell(int argc, char *argv[]) {
2301         xasprintf(&prompt, "%s> ", identname);
2302         int result = 0;
2303         char buf[4096];
2304         char *line = NULL;
2305         int maxargs = argc + 16;
2306         char **nargv = xmalloc(maxargs * sizeof *nargv);
2307
2308         for(int i = 0; i < argc; i++)
2309                 nargv[i] = argv[i];
2310
2311 #ifdef HAVE_READLINE
2312         rl_readline_name = "tinc";
2313         rl_completion_entry_function = complete_nothing;
2314         rl_attempted_completion_function = completion;
2315         rl_filename_completion_desired = 0;
2316         char *copy = NULL;
2317 #endif
2318
2319         while(true) {
2320 #ifdef HAVE_READLINE
2321                 if(tty) {
2322                         free(copy);
2323                         free(line);
2324                         rl_basic_word_break_characters = "\t\n ";
2325                         line = readline(prompt);
2326                         if(line)
2327                                 copy = xstrdup(line);
2328                 } else {
2329                         line = fgets(buf, sizeof buf, stdin);
2330                 }
2331 #else
2332                 if(tty)
2333                         fputs(prompt, stdout);
2334
2335                 line = fgets(buf, sizeof buf, stdin);
2336 #endif
2337
2338                 if(!line)
2339                         break;
2340
2341                 /* Ignore comments */
2342
2343                 if(*line == '#')
2344                         continue;
2345
2346                 /* Split */
2347
2348                 int nargc = argc;
2349                 char *p = line + strspn(line, " \t\n");
2350                 char *next = strtok(p, " \t\n");
2351
2352                 while(p && *p) {
2353                         if(nargc >= maxargs) {
2354                                 fprintf(stderr, "next %p '%s', p %p '%s'\n", next, next, p, p);
2355                                 abort();
2356                                 maxargs *= 2;
2357                                 nargv = xrealloc(nargv, maxargs * sizeof *nargv);
2358                         }
2359
2360                         nargv[nargc++] = p;
2361                         p = next;
2362                         next = strtok(NULL, " \t\n");
2363                 }
2364
2365                 if(nargc == argc)
2366                         continue;
2367
2368                 if(!strcasecmp(nargv[argc], "exit") || !strcasecmp(nargv[argc], "quit"))
2369                         return result;
2370
2371                 bool found = false;
2372
2373                 for(int i = 0; commands[i].command; i++) {
2374                         if(!strcasecmp(nargv[argc], commands[i].command)) {
2375                                 result |= commands[i].function(nargc - argc - 1, nargv + argc + 1);
2376                                 found = true;
2377                                 break;
2378                         }
2379                 }
2380
2381 #ifdef HAVE_READLINE
2382                 if(tty && found)
2383                         add_history(copy);
2384 #endif
2385
2386                 if(!found) {
2387                         fprintf(stderr, "Unknown command `%s'.\n", nargv[argc]);
2388                         result |= 1;
2389                 }
2390         }
2391
2392         free(nargv);
2393
2394         if(tty)
2395                 printf("\n");
2396         return result;
2397 }
2398
2399
2400 int main(int argc, char *argv[]) {
2401         program_name = argv[0];
2402         orig_argv = argv;
2403         orig_argc = argc;
2404
2405         if(!parse_options(argc, argv))
2406                 return 1;
2407
2408         make_names();
2409         xasprintf(&tinc_conf, "%s" SLASH "tinc.conf", confbase);
2410         xasprintf(&hosts_dir, "%s" SLASH "hosts", confbase);
2411
2412         if(show_version) {
2413                 version();
2414                 return 0;
2415         }
2416
2417         if(show_help) {
2418                 usage(false);
2419                 return 0;
2420         }
2421
2422 #ifdef HAVE_MINGW
2423         static struct WSAData wsa_state;
2424
2425         if(WSAStartup(MAKEWORD(2, 2), &wsa_state)) {
2426                 fprintf(stderr, "System call `%s' failed: %s", "WSAStartup", winerror(GetLastError()));
2427                 return false;
2428         }
2429 #endif
2430
2431         srand(time(NULL));
2432         crypto_init();
2433
2434         tty = isatty(0) && isatty(1);
2435
2436         if(optind >= argc)
2437                 return cmd_shell(argc, argv);
2438
2439         for(int i = 0; commands[i].command; i++) {
2440                 if(!strcasecmp(argv[optind], commands[i].command))
2441                         return commands[i].function(argc - optind, argv + optind);
2442         }
2443
2444         fprintf(stderr, "Unknown command `%s'.\n", argv[optind]);
2445         usage(true);
2446         return 1;
2447 }