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

   1 /*
   2     tincctl.c -- Controlling a running tincd
   3     Copyright (C) 2007-2013 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 #ifdef HAVE_MINGW
  43 #define SCRIPTEXTENSION ".bat"
  44 #else
  45 #define SCRIPTEXTENSION ""
  46 #endif
  47
  48 static char **orig_argv;
  49 static int orig_argc;
  50
  51 /* If nonzero, display usage information and exit. */
  52 static bool show_help = false;
  53
  54 /* If nonzero, print the version on standard output and exit.  */
  55 static bool show_version = false;
  56
  57 static char *name = NULL;
  58 static char controlcookie[1025];
  59 char *tinc_conf = NULL;
  60 char *hosts_dir = NULL;
  61 struct timeval now;
  62
  63 // Horrible global variables...
  64 static int pid = 0;
  65 int fd = -1;
  66 char line[4096];
  67 static int code;
  68 static int req;
  69 static int result;
  70 static bool force = false;
  71 bool tty = true;
  72 bool confbasegiven = false;
  73 bool netnamegiven = false;
  74
  75 #ifdef HAVE_MINGW
  76 static struct WSAData wsa_state;
  77 #endif
  78
  79 static struct option const long_options[] = {
  80         {"config", required_argument, NULL, 'c'},
  81         {"net", required_argument, NULL, 'n'},
  82         {"help", no_argument, NULL, 1},
  83         {"version", no_argument, NULL, 2},
  84         {"pidfile", required_argument, NULL, 3},
  85         {"force", no_argument, NULL, 4},
  86         {NULL, 0, NULL, 0}
  87 };
  88
  89 static void version(void) {
  90         printf("%s version %s (built %s %s, protocol %d.%d)\n", PACKAGE,
  91                    VERSION, __DATE__, __TIME__, PROT_MAJOR, PROT_MINOR);
  92         printf("Copyright (C) 1998-2012 Ivo Timmermans, Guus Sliepen and others.\n"
  93                         "See the AUTHORS file for a complete list.\n\n"
  94                         "tinc comes with ABSOLUTELY NO WARRANTY.  This is free software,\n"
  95                         "and you are welcome to redistribute it under certain conditions;\n"
  96                         "see the file COPYING for details.\n");
  97 }
  98
  99 static void usage(bool status) {
 100         if(status) {
 101                 fprintf(stderr, "Try `%s --help\' for more information.\n", program_name);
 102         } else {
 103                 printf("Usage: %s [options] command\n\n", program_name);
 104                 printf("Valid options are:\n"
 105                                 "  -c, --config=DIR        Read configuration options from DIR.\n"
 106                                 "  -n, --net=NETNAME       Connect to net NETNAME.\n"
 107                                 "      --pidfile=FILENAME  Read control cookie from FILENAME.\n"
 108                                 "      --help              Display this help and exit.\n"
 109                                 "      --version           Output version information and exit.\n"
 110                                 "\n"
 111                                 "Valid commands are:\n"
 112                                 "  init [name]                Create initial configuration files.\n"
 113                                 "  get VARIABLE               Print current value of VARIABLE\n"
 114                                 "  set VARIABLE VALUE         Set VARIABLE to VALUE\n"
 115                                 "  add VARIABLE VALUE         Add VARIABLE with the given VALUE\n"
 116                                 "  del VARIABLE [VALUE]       Remove VARIABLE [only ones with watching VALUE]\n"
 117                                 "  start [tincd options]      Start tincd.\n"
 118                                 "  stop                       Stop tincd.\n"
 119                                 "  restart [tincd options]    Restart tincd.\n"
 120                                 "  reload                     Partially reload configuration of running tincd.\n"
 121                                 "  pid                        Show PID of currently running tincd.\n"
 122                                 "  generate-keys [bits]       Generate new RSA and ECDSA public/private keypairs.\n"
 123                                 "  generate-rsa-keys [bits]   Generate a new RSA public/private keypair.\n"
 124                                 "  generate-ecdsa-keys        Generate a new ECDSA public/private keypair.\n"
 125                                 "  dump                       Dump a list of one of the following things:\n"
 126                                 "    [reachable] nodes        - all known nodes in the VPN\n"
 127                                 "    edges                    - all known connections in the VPN\n"
 128                                 "    subnets                  - all known subnets in the VPN\n"
 129                                 "    connections              - all meta connections with ourself\n"
 130                                 "    [di]graph                - graph of the VPN in dotty format\n"
 131                                 "  info NODE|SUBNET|ADDRESS   Give information about a particular NODE, SUBNET or ADDRESS.\n"
 132                                 "  purge                      Purge unreachable nodes\n"
 133                                 "  debug N                    Set debug level\n"
 134                                 "  retry                      Retry all outgoing connections\n"
 135                                 "  disconnect NODE            Close meta connection with NODE\n"
 136 #ifdef HAVE_CURSES
 137                                 "  top                        Show real-time statistics\n"
 138 #endif
 139                                 "  pcap [snaplen]             Dump traffic in pcap format [up to snaplen bytes per packet]\n"
 140                                 "  log [level]                Dump log output [up to the specified level]\n"
 141                                 "  export                     Export host configuration of local node to standard output\n"
 142                                 "  export-all                 Export all host configuration files to standard output\n"
 143                                 "  import [--force]           Import host configuration file(s) from standard input\n"
 144                                 "  exchange [--force]         Same as export followed by import\n"
 145                                 "  exchange-all [--force]     Same as export-all followed by import\n"
 146                                 "  invite NODE [...]          Generate an invitation for NODE\n"
 147                                 "  join INVITATION            Join a VPN using an INVITIATION\n"
 148                                 "\n");
 149                 printf("Report bugs to tinc@tinc-vpn.org.\n");
 150         }
 151 }
 152
 153 static bool parse_options(int argc, char **argv) {
 154         int r;
 155         int option_index = 0;
 156
 157         while((r = getopt_long(argc, argv, "+c:n:", long_options, &option_index)) != EOF) {
 158                 switch (r) {
 159                         case 0:   /* long option */
 160                                 break;
 161
 162                         case 'c': /* config file */
 163                                 confbase = xstrdup(optarg);
 164                                 confbasegiven = true;
 165                                 break;
 166
 167                         case 'n': /* net name given */
 168                                 netname = xstrdup(optarg);
 169                                 break;
 170
 171                         case 1:   /* show help */
 172                                 show_help = true;
 173                                 break;
 174
 175                         case 2:   /* show version */
 176                                 show_version = true;
 177                                 break;
 178
 179                         case 3:   /* open control socket here */
 180                                 pidfilename = xstrdup(optarg);
 181                                 break;
 182
 183                         case 4:   /* force */
 184                                 force = true;
 185                                 break;
 186
 187                         case '?': /* wrong options */
 188                                 usage(true);
 189                                 return false;
 190
 191                         default:
 192                                 break;
 193                 }
 194         }
 195
 196         if(!netname && (netname = getenv("NETNAME")))
 197                 netname = xstrdup(netname);
 198
 199         /* netname "." is special: a "top-level name" */
 200
 201         if(netname && (!*netname || !strcmp(netname, "."))) {
 202                 free(netname);
 203                 netname = NULL;
 204         }
 205
 206         if(netname && (strpbrk(netname, "\\/") || *netname == '.')) {
 207                 fprintf(stderr, "Invalid character in netname!\n");
 208                 return false;
 209         }
 210
 211         return true;
 212 }
 213
 214 static void disable_old_keys(const char *filename, const char *what) {
 215         char tmpfile[PATH_MAX] = "";
 216         char buf[1024];
 217         bool disabled = false;
 218         bool block = false;
 219         bool error = false;
 220         FILE *r, *w;
 221
 222         r = fopen(filename, "r");
 223         if(!r)
 224                 return;
 225
 226         snprintf(tmpfile, sizeof tmpfile, "%s.tmp", filename);
 227
 228         w = fopen(tmpfile, "w");
 229
 230 #ifdef HAVE_FCHMOD
 231         /* Let the temporary file have the same permissions as the original. */
 232
 233         if(w) {
 234                 struct stat st = {.st_mode = 0600};
 235                 fstat(fileno(r), &st);
 236                 fchmod(fileno(w), st.st_mode);
 237         }
 238 #endif
 239
 240         while(fgets(buf, sizeof buf, r)) {
 241                 if(!block && !strncmp(buf, "-----BEGIN ", 11)) {
 242                         if((strstr(buf, " EC ") && strstr(what, "ECDSA")) || (strstr(buf, " RSA ") && strstr(what, "RSA"))) {
 243                                 disabled = true;
 244                                 block = true;
 245                         }
 246                 }
 247
 248                 bool ecdsapubkey = !strncasecmp(buf, "ECDSAPublicKey", 14) && strchr(" \t=", buf[14]) && strstr(what, "ECDSA");
 249
 250                 if(ecdsapubkey)
 251                         disabled = true;
 252
 253                 if(w) {
 254                         if(block || ecdsapubkey)
 255                                 fputc('#', w);
 256                         if(fputs(buf, w) < 0) {
 257                                 error = true;
 258                                 break;
 259                         }
 260                 }
 261
 262                 if(block && !strncmp(buf, "-----END ", 9))
 263                         block = false;
 264         }
 265
 266         if(w)
 267                 if(fclose(w) < 0)
 268                         error = true;
 269         if(ferror(r) || fclose(r) < 0)
 270                 error = true;
 271
 272         if(disabled) {
 273                 if(!w || error) {
 274                         fprintf(stderr, "Warning: old key(s) found, remove them by hand!\n");
 275                         if(w)
 276                                 unlink(tmpfile);
 277                         return;
 278                 }
 279
 280 #ifdef HAVE_MINGW
 281                 // We cannot atomically replace files on Windows.
 282                 char bakfile[PATH_MAX] = "";
 283                 snprintf(bakfile, sizeof bakfile, "%s.bak", filename);
 284                 if(rename(filename, bakfile) || rename(tmpfile, filename)) {
 285                         rename(bakfile, filename);
 286 #else
 287                 if(rename(tmpfile, filename)) {
 288 #endif
 289                         fprintf(stderr, "Warning: old key(s) found, remove them by hand!\n");
 290                 } else  {
 291 #ifdef HAVE_MINGW
 292                         unlink(bakfile);
 293 #endif
 294                         fprintf(stderr, "Warning: old key(s) found and disabled.\n");
 295                 }
 296         }
 297
 298         unlink(tmpfile);
 299 }
 300
 301 static FILE *ask_and_open(const char *filename, const char *what, const char *mode, bool ask) {
 302         FILE *r;
 303         char *directory;
 304         char buf[PATH_MAX];
 305         char buf2[PATH_MAX];
 306
 307         /* Check stdin and stdout */
 308         if(ask && tty) {
 309                 /* Ask for a file and/or directory name. */
 310                 fprintf(stdout, "Please enter a file to save %s to [%s]: ", what, filename);
 311                 fflush(stdout);
 312
 313                 if(fgets(buf, sizeof buf, stdin) == NULL) {
 314                         fprintf(stderr, "Error while reading stdin: %s\n", strerror(errno));
 315                         return NULL;
 316                 }
 317
 318                 size_t len = strlen(buf);
 319                 if(len)
 320                         buf[--len] = 0;
 321
 322                 if(len)
 323                         filename = buf;
 324         }
 325
 326 #ifdef HAVE_MINGW
 327         if(filename[0] != '\\' && filename[0] != '/' && !strchr(filename, ':')) {
 328 #else
 329         if(filename[0] != '/') {
 330 #endif
 331                 /* The directory is a relative path or a filename. */
 332                 directory = get_current_dir_name();
 333                 snprintf(buf2, sizeof buf2, "%s" SLASH "%s", directory, filename);
 334                 filename = buf2;
 335         }
 336
 337         disable_old_keys(filename, what);
 338
 339         /* Open it first to keep the inode busy */
 340
 341         r = fopen(filename, mode);
 342
 343         if(!r) {
 344                 fprintf(stderr, "Error opening file `%s': %s\n", filename, strerror(errno));
 345                 return NULL;
 346         }
 347
 348         return r;
 349 }
 350
 351 /*
 352   Generate a public/private ECDSA keypair, and ask for a file to store
 353   them in.
 354 */
 355 static bool ecdsa_keygen(bool ask) {
 356         ecdsa_t *key;
 357         FILE *f;
 358         char *pubname, *privname;
 359
 360         fprintf(stderr, "Generating ECDSA keypair:\n");
 361
 362         if(!(key = ecdsa_generate())) {
 363                 fprintf(stderr, "Error during key generation!\n");
 364                 return false;
 365         } else
 366                 fprintf(stderr, "Done.\n");
 367
 368         xasprintf(&privname, "%s" SLASH "ecdsa_key.priv", confbase);
 369         f = ask_and_open(privname, "private ECDSA key", "a", ask);
 370         free(privname);
 371
 372         if(!f)
 373                 return false;
 374
 375 #ifdef HAVE_FCHMOD
 376         /* Make it unreadable for others. */
 377         fchmod(fileno(f), 0600);
 378 #endif
 379
 380         if(!ecdsa_write_pem_private_key(key, f)) {
 381                 fprintf(stderr, "Error writing private key!\n");
 382                 ecdsa_free(key);
 383                 fclose(f);
 384                 return false;
 385         }
 386
 387         fclose(f);
 388
 389         if(name)
 390                 xasprintf(&pubname, "%s" SLASH "hosts" SLASH "%s", confbase, name);
 391         else
 392                 xasprintf(&pubname, "%s" SLASH "ecdsa_key.pub", confbase);
 393
 394         f = ask_and_open(pubname, "public ECDSA key", "a", ask);
 395         free(pubname);
 396
 397         if(!f)
 398                 return false;
 399
 400         char *pubkey = ecdsa_get_base64_public_key(key);
 401         fprintf(f, "ECDSAPublicKey = %s\n", pubkey);
 402         free(pubkey);
 403
 404         fclose(f);
 405         ecdsa_free(key);
 406
 407         return true;
 408 }
 409
 410 /*
 411   Generate a public/private RSA keypair, and ask for a file to store
 412   them in.
 413 */
 414 static bool rsa_keygen(int bits, bool ask) {
 415         rsa_t *key;
 416         FILE *f;
 417         char *pubname, *privname;
 418
 419         fprintf(stderr, "Generating %d bits keys:\n", bits);
 420
 421         if(!(key = rsa_generate(bits, 0x10001))) {
 422                 fprintf(stderr, "Error during key generation!\n");
 423                 return false;
 424         } else
 425                 fprintf(stderr, "Done.\n");
 426
 427         xasprintf(&privname, "%s" SLASH "rsa_key.priv", confbase);
 428         f = ask_and_open(privname, "private RSA key", "a", ask);
 429         free(privname);
 430
 431         if(!f)
 432                 return false;
 433
 434 #ifdef HAVE_FCHMOD
 435         /* Make it unreadable for others. */
 436         fchmod(fileno(f), 0600);
 437 #endif
 438
 439         if(!rsa_write_pem_private_key(key, f)) {
 440                 fprintf(stderr, "Error writing private key!\n");
 441                 fclose(f);
 442                 rsa_free(key);
 443                 return false;
 444         }
 445
 446         fclose(f);
 447
 448         if(name)
 449                 xasprintf(&pubname, "%s" SLASH "hosts" SLASH "%s", confbase, name);
 450         else
 451                 xasprintf(&pubname, "%s" SLASH "rsa_key.pub", confbase);
 452
 453         f = ask_and_open(pubname, "public RSA key", "a", ask);
 454         free(pubname);
 455
 456         if(!f)
 457                 return false;
 458
 459         if(!rsa_write_pem_public_key(key, f)) {
 460                 fprintf(stderr, "Error writing public key!\n");
 461                 fclose(f);
 462                 rsa_free(key);
 463                 return false;
 464         }
 465
 466         fclose(f);
 467         rsa_free(key);
 468
 469         return true;
 470 }
 471
 472 char buffer[4096];
 473 size_t blen = 0;
 474
 475 bool recvline(int fd, char *line, size_t len) {
 476         char *newline = NULL;
 477
 478         if(!fd)
 479                 abort();
 480
 481         while(!(newline = memchr(buffer, '\n', blen))) {
 482                 int result = recv(fd, buffer + blen, sizeof buffer - blen, 0);
 483                 if(result == -1 && errno == EINTR)
 484                         continue;
 485                 else if(result <= 0)
 486                         return false;
 487                 blen += result;
 488         }
 489
 490         if(newline - buffer >= len)
 491                 return false;
 492
 493         len = newline - buffer;
 494
 495         memcpy(line, buffer, len);
 496         line[len] = 0;
 497         memmove(buffer, newline + 1, blen - len - 1);
 498         blen -= len + 1;
 499
 500         return true;
 501 }
 502
 503 bool recvdata(int fd, char *data, size_t len) {
 504         if(len == -1)
 505                 len = blen;
 506
 507         while(blen < len) {
 508                 int result = recv(fd, buffer + blen, sizeof buffer - blen, 0);
 509                 if(result == -1 && errno == EINTR)
 510                         continue;
 511                 else if(result <= 0)
 512                         return false;
 513                 blen += result;
 514         }
 515
 516         memcpy(data, buffer, len);
 517         memmove(buffer, buffer + len, blen - len);
 518         blen -= len;
 519
 520         return true;
 521 }
 522
 523 bool sendline(int fd, char *format, ...) {
 524         static char buffer[4096];
 525         char *p = buffer;
 526         int blen = 0;
 527         va_list ap;
 528
 529         va_start(ap, format);
 530         blen = vsnprintf(buffer, sizeof buffer, format, ap);
 531         va_end(ap);
 532
 533         if(blen < 1 || blen >= sizeof buffer)
 534                 return false;
 535
 536         buffer[blen] = '\n';
 537         blen++;
 538
 539         while(blen) {
 540                 int result = send(fd, p, blen, 0);
 541                 if(result == -1 && errno == EINTR)
 542                         continue;
 543                 else if(result <= 0)
 544                         return false;
 545                 p += result;
 546                 blen -= result;
 547         }
 548
 549         return true;
 550 }
 551
 552 static void pcap(int fd, FILE *out, int snaplen) {
 553         sendline(fd, "%d %d %d", CONTROL, REQ_PCAP, snaplen);
 554         char data[9018];
 555
 556         struct {
 557                 uint32_t magic;
 558                 uint16_t major;
 559                 uint16_t minor;
 560                 uint32_t tz_offset;
 561                 uint32_t tz_accuracy;
 562                 uint32_t snaplen;
 563                 uint32_t ll_type;
 564         } header = {
 565                 0xa1b2c3d4,
 566                 2, 4,
 567                 0, 0,
 568                 snaplen ?: sizeof data,
 569                 1,
 570         };
 571
 572         struct {
 573                 uint32_t tv_sec;
 574                 uint32_t tv_usec;
 575                 uint32_t len;
 576                 uint32_t origlen;
 577         } packet;
 578
 579         struct timeval tv;
 580
 581         fwrite(&header, sizeof header, 1, out);
 582         fflush(out);
 583
 584         char line[32];
 585         while(recvline(fd, line, sizeof line)) {
 586                 int code, req, len;
 587                 int n = sscanf(line, "%d %d %d", &code, &req, &len);
 588                 gettimeofday(&tv, NULL);
 589                 if(n != 3 || code != CONTROL || req != REQ_PCAP || len < 0 || len > sizeof data)
 590                         break;
 591                 if(!recvdata(fd, data, len))
 592                         break;
 593                 packet.tv_sec = tv.tv_sec;
 594                 packet.tv_usec = tv.tv_usec;
 595                 packet.len = len;
 596                 packet.origlen = len;
 597                 fwrite(&packet, sizeof packet, 1, out);
 598                 fwrite(data, len, 1, out);
 599                 fflush(out);
 600         }
 601 }
 602
 603 static void logcontrol(int fd, FILE *out, int level) {
 604         sendline(fd, "%d %d %d", CONTROL, REQ_LOG, level);
 605         char data[1024];
 606         char line[32];
 607
 608         while(recvline(fd, line, sizeof line)) {
 609                 int code, req, len;
 610                 int n = sscanf(line, "%d %d %d", &code, &req, &len);
 611                 if(n != 3 || code != CONTROL || req != REQ_LOG || len < 0 || len > sizeof data)
 612                         break;
 613                 if(!recvdata(fd, data, len))
 614                         break;
 615                 fwrite(data, len, 1, out);
 616                 fputc('\n', out);
 617                 fflush(out);
 618         }
 619 }
 620
 621 #ifdef HAVE_MINGW
 622 static bool remove_service(void) {
 623         SC_HANDLE manager = NULL;
 624         SC_HANDLE service = NULL;
 625         SERVICE_STATUS status = {0};
 626
 627         manager = OpenSCManager(NULL, NULL, SC_MANAGER_ALL_ACCESS);
 628         if(!manager) {
 629                 fprintf(stderr, "Could not open service manager: %s\n", winerror(GetLastError()));
 630                 return false;
 631         }
 632
 633         service = OpenService(manager, identname, SERVICE_ALL_ACCESS);
 634
 635         if(!service) {
 636                 fprintf(stderr, "Could not open %s service: %s\n", identname, winerror(GetLastError()));
 637                 return false;
 638         }
 639
 640         if(!ControlService(service, SERVICE_CONTROL_STOP, &status))
 641                 fprintf(stderr, "Could not stop %s service: %s\n", identname, winerror(GetLastError()));
 642         else
 643                 fprintf(stderr, "%s service stopped\n", identname);
 644
 645         if(!DeleteService(service)) {
 646                 fprintf(stderr, "Could not remove %s service: %s\n", identname, winerror(GetLastError()));
 647                 return false;
 648         }
 649
 650         fprintf(stderr, "%s service removed\n", identname);
 651
 652         return true;
 653 }
 654 #endif
 655
 656 bool connect_tincd(bool verbose) {
 657         if(fd >= 0) {
 658                 fd_set r;
 659                 FD_ZERO(&r);
 660                 FD_SET(fd, &r);
 661                 struct timeval tv = {0, 0};
 662                 if(select(fd + 1, &r, NULL, NULL, &tv)) {
 663                         fprintf(stderr, "Previous connection to tincd lost, reconnecting.\n");
 664                         close(fd);
 665                         fd = -1;
 666                 } else {
 667                         return true;
 668                 }
 669         }
 670
 671         FILE *f = fopen(pidfilename, "r");
 672         if(!f) {
 673                 if(verbose)
 674                         fprintf(stderr, "Could not open pid file %s: %s\n", pidfilename, strerror(errno));
 675                 return false;
 676         }
 677
 678         char host[129];
 679         char port[129];
 680
 681         if(fscanf(f, "%20d %1024s %128s port %128s", &pid, controlcookie, host, port) != 4) {
 682                 if(verbose)
 683                         fprintf(stderr, "Could not parse pid file %s\n", pidfilename);
 684                 fclose(f);
 685                 return false;
 686         }
 687
 688         fclose(f);
 689
 690 #ifdef HAVE_MINGW
 691         if(WSAStartup(MAKEWORD(2, 2), &wsa_state)) {
 692                 if(verbose)
 693                         fprintf(stderr, "System call `%s' failed: %s", "WSAStartup", winerror(GetLastError()));
 694                 return false;
 695         }
 696 #endif
 697
 698 #ifndef HAVE_MINGW
 699         struct sockaddr_un sa;
 700         sa.sun_family = AF_UNIX;
 701         strncpy(sa.sun_path, unixsocketname, sizeof sa.sun_path);
 702
 703         fd = socket(AF_UNIX, SOCK_STREAM, 0);
 704         if(fd < 0) {
 705                 if(verbose)
 706                         fprintf(stderr, "Cannot create UNIX socket: %s\n", sockstrerror(sockerrno));
 707                 return false;
 708         }
 709
 710         if(connect(fd, (struct sockaddr *)&sa, sizeof sa) < 0) {
 711                 if(verbose)
 712                         fprintf(stderr, "Cannot connect to UNIX socket %s: %s\n", unixsocketname, sockstrerror(sockerrno));
 713                 close(fd);
 714                 fd = -1;
 715                 return false;
 716         }
 717 #else
 718         struct addrinfo hints = {
 719                 .ai_family = AF_UNSPEC,
 720                 .ai_socktype = SOCK_STREAM,
 721                 .ai_protocol = IPPROTO_TCP,
 722                 .ai_flags = 0,
 723         };
 724
 725         struct addrinfo *res = NULL;
 726
 727         if(getaddrinfo(host, port, &hints, &res) || !res) {
 728                 if(verbose)
 729                         fprintf(stderr, "Cannot resolve %s port %s: %s", host, port, strerror(errno));
 730                 return false;
 731         }
 732
 733         fd = socket(res->ai_family, SOCK_STREAM, IPPROTO_TCP);
 734         if(fd < 0) {
 735                 if(verbose)
 736                         fprintf(stderr, "Cannot create TCP socket: %s\n", sockstrerror(sockerrno));
 737                 return false;
 738         }
 739
 740 #ifdef HAVE_MINGW
 741         unsigned long arg = 0;
 742
 743         if(ioctlsocket(fd, FIONBIO, &arg) != 0) {
 744                 if(verbose)
 745                         fprintf(stderr, "ioctlsocket failed: %s", sockstrerror(sockerrno));
 746         }
 747 #endif
 748
 749         if(connect(fd, res->ai_addr, res->ai_addrlen) < 0) {
 750                 if(verbose)
 751                         fprintf(stderr, "Cannot connect to %s port %s: %s\n", host, port, sockstrerror(sockerrno));
 752                 close(fd);
 753                 fd = -1;
 754                 return false;
 755         }
 756
 757         freeaddrinfo(res);
 758 #endif
 759
 760         char data[4096];
 761         int version;
 762
 763         if(!recvline(fd, line, sizeof line) || sscanf(line, "%d %s %d", &code, data, &version) != 3 || code != 0) {
 764                 if(verbose)
 765                         fprintf(stderr, "Cannot read greeting from control socket: %s\n", sockstrerror(sockerrno));
 766                 close(fd);
 767                 fd = -1;
 768                 return false;
 769         }
 770
 771         sendline(fd, "%d ^%s %d", ID, controlcookie, TINC_CTL_VERSION_CURRENT);
 772
 773         if(!recvline(fd, line, sizeof line) || sscanf(line, "%d %d %d", &code, &version, &pid) != 3 || code != 4 || version != TINC_CTL_VERSION_CURRENT) {
 774                 if(verbose)
 775                         fprintf(stderr, "Could not fully establish control socket connection\n");
 776                 close(fd);
 777                 fd = -1;
 778                 return false;
 779         }
 780
 781         return true;
 782 }
 783
 784
 785 static int cmd_start(int argc, char *argv[]) {
 786         if(connect_tincd(false)) {
 787                 if(netname)
 788                         fprintf(stderr, "A tincd is already running for net `%s' with pid %d.\n", netname, pid);
 789                 else
 790                         fprintf(stderr, "A tincd is already running with pid %d.\n", pid);
 791                 return 0;
 792         }
 793
 794         char *c;
 795         char *slash = strrchr(program_name, '/');
 796
 797 #ifdef HAVE_MINGW
 798         if ((c = strrchr(program_name, '\\')) > slash)
 799                 slash = c;
 800 #endif
 801
 802         if (slash++)
 803                 xasprintf(&c, "%.*stincd", (int)(slash - program_name), program_name);
 804         else
 805                 c = "tincd";
 806
 807         int nargc = 0;
 808         char **nargv = xzalloc((optind + argc) * sizeof *nargv);
 809
 810         nargv[nargc++] = c;
 811         for(int i = 1; i < optind; i++)
 812                 nargv[nargc++] = orig_argv[i];
 813         for(int i = 1; i < argc; i++)
 814                 nargv[nargc++] = argv[i];
 815
 816 #ifdef HAVE_MINGW
 817         execvp(c, nargv);
 818         fprintf(stderr, "Error starting %s: %s\n", c, strerror(errno));
 819         return 1;
 820 #else
 821         pid_t pid = fork();
 822         if(pid == -1) {
 823                 fprintf(stderr, "Could not fork: %s\n", strerror(errno));
 824                 free(nargv);
 825                 return 1;
 826         }
 827
 828         if(!pid)
 829                 exit(execvp(c, nargv));
 830
 831         free(nargv);
 832
 833         int status = -1, result;
 834 #ifdef SIGINT
 835         signal(SIGINT, SIG_IGN);
 836 #endif
 837         result = waitpid(pid, &status, 0);
 838 #ifdef SIGINT
 839         signal(SIGINT, SIG_DFL);
 840 #endif
 841
 842         if(result != pid || !WIFEXITED(status) || WEXITSTATUS(status)) {
 843                 fprintf(stderr, "Error starting %s\n", c);
 844                 return 1;
 845         }
 846
 847         return 0;
 848 #endif
 849 }
 850
 851 static int cmd_stop(int argc, char *argv[]) {
 852         if(argc > 1) {
 853                 fprintf(stderr, "Too many arguments!\n");
 854                 return 1;
 855         }
 856
 857 #ifndef HAVE_MINGW
 858         if(!connect_tincd(true)) {
 859                 if(pid) {
 860                         if(kill(pid, SIGTERM)) {
 861                                 fprintf(stderr, "Could not send TERM signal to process with PID %u: %s\n", pid, strerror(errno));
 862                                 return 1;
 863                         }
 864
 865                         fprintf(stderr, "Sent TERM signal to process with PID %u.\n", pid);
 866                         waitpid(pid, NULL, 0);
 867                         return 0;
 868                 }
 869
 870                 return 1;
 871         }
 872
 873         sendline(fd, "%d %d", CONTROL, REQ_STOP);
 874
 875         while(recvline(fd, line, sizeof line)) {
 876                 // Wait for tincd to close the connection...
 877         }
 878 #else
 879         if(!remove_service())
 880                 return 1;
 881 #endif
 882         close(fd);
 883         pid = 0;
 884         fd = -1;
 885
 886         return 0;
 887 }
 888
 889 static int cmd_restart(int argc, char *argv[]) {
 890         cmd_stop(1, argv);
 891         return cmd_start(argc, argv);
 892 }
 893
 894 static int cmd_reload(int argc, char *argv[]) {
 895         if(argc > 1) {
 896                 fprintf(stderr, "Too many arguments!\n");
 897                 return 1;
 898         }
 899
 900         if(!connect_tincd(true))
 901                 return 1;
 902
 903         sendline(fd, "%d %d", CONTROL, REQ_RELOAD);
 904         if(!recvline(fd, line, sizeof line) || sscanf(line, "%d %d %d", &code, &req, &result) != 3 || code != CONTROL || req != REQ_RELOAD || result) {
 905                 fprintf(stderr, "Could not reload configuration.\n");
 906                 return 1;
 907         }
 908
 909         return 0;
 910
 911 }
 912
 913 static int cmd_dump(int argc, char *argv[]) {
 914         bool only_reachable = false;
 915
 916         if(argc > 2 && !strcasecmp(argv[1], "reachable")) {
 917                 if(strcasecmp(argv[2], "nodes")) {
 918                         fprintf(stderr, "`reachable' only supported for nodes.\n");
 919                         usage(true);
 920                         return 1;
 921                 }
 922                 only_reachable = true;
 923                 argv++;
 924                 argc--;
 925         }
 926
 927         if(argc != 2) {
 928                 fprintf(stderr, "Invalid number of arguments.\n");
 929                 usage(true);
 930                 return 1;
 931         }
 932
 933         if(!connect_tincd(true))
 934                 return 1;
 935
 936         int do_graph = 0;
 937
 938         if(!strcasecmp(argv[1], "nodes"))
 939                 sendline(fd, "%d %d", CONTROL, REQ_DUMP_NODES);
 940         else if(!strcasecmp(argv[1], "edges"))
 941                 sendline(fd, "%d %d", CONTROL, REQ_DUMP_EDGES);
 942         else if(!strcasecmp(argv[1], "subnets"))
 943                 sendline(fd, "%d %d", CONTROL, REQ_DUMP_SUBNETS);
 944         else if(!strcasecmp(argv[1], "connections"))
 945                 sendline(fd, "%d %d", CONTROL, REQ_DUMP_CONNECTIONS);
 946         else if(!strcasecmp(argv[1], "graph")) {
 947                 sendline(fd, "%d %d", CONTROL, REQ_DUMP_NODES);
 948                 sendline(fd, "%d %d", CONTROL, REQ_DUMP_EDGES);
 949                 do_graph = 1;
 950         } else if(!strcasecmp(argv[1], "digraph")) {
 951                 sendline(fd, "%d %d", CONTROL, REQ_DUMP_NODES);
 952                 sendline(fd, "%d %d", CONTROL, REQ_DUMP_EDGES);
 953                 do_graph = 2;
 954         } else {
 955                 fprintf(stderr, "Unknown dump type '%s'.\n", argv[1]);
 956                 usage(true);
 957                 return 1;
 958         }
 959
 960         if(do_graph == 1)
 961                 printf("graph {\n");
 962         else if(do_graph == 2)
 963                 printf("digraph {\n");
 964
 965         while(recvline(fd, line, sizeof line)) {
 966                 char node1[4096], node2[4096];
 967                 int n = sscanf(line, "%d %d %s %s", &code, &req, node1, node2);
 968                 if(n == 2) {
 969                         if(do_graph && req == REQ_DUMP_NODES)
 970                                 continue;
 971                         else {
 972                                 if(do_graph)
 973                                         printf("}\n");
 974                                 return 0;
 975                         }
 976                 }
 977                 if(n < 2)
 978                         break;
 979
 980                 char node[4096];
 981                 char from[4096];
 982                 char to[4096];
 983                 char subnet[4096];
 984                 char host[4096];
 985                 char port[4096];
 986                 char via[4096];
 987                 char nexthop[4096];
 988                 int cipher, digest, maclength, compression, distance, socket, weight;
 989                 short int pmtu, minmtu, maxmtu;
 990                 unsigned int options, status_int;
 991                 node_status_t status;
 992                 long int last_state_change;
 993
 994                 switch(req) {
 995                         case REQ_DUMP_NODES: {
 996                                 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);
 997                                 if(n != 16) {
 998                                         fprintf(stderr, "Unable to parse node dump from tincd: %s\n", line);
 999                                         return 1;
1000                                 }
1001
1002                                 memcpy(&status, &status_int, sizeof status);
1003
1004                                 if(do_graph) {
1005                                         const char *color = "black";
1006                                         if(!strcmp(host, "MYSELF"))
1007                                                 color = "green";
1008                                         else if(!status.reachable)
1009                                                 color = "red";
1010                                         else if(strcmp(via, node))
1011                                                 color = "orange";
1012                                         else if(!status.validkey)
1013                                                 color = "black";
1014                                         else if(minmtu > 0)
1015                                                 color = "green";
1016                                         printf(" %s [label = \"%s\", color = \"%s\"%s];\n", node, node, color, strcmp(host, "MYSELF") ? "" : ", style = \"filled\"");
1017                                 } else {
1018                                         if(only_reachable && !status.reachable)
1019                                                 continue;
1020                                         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",
1021                                                         node, host, port, cipher, digest, maclength, compression, options, status_int, nexthop, via, distance, pmtu, minmtu, maxmtu);
1022                                 }
1023                         } break;
1024
1025                         case REQ_DUMP_EDGES: {
1026                                 int n = sscanf(line, "%*d %*d %s %s %s port %s %x %d", from, to, host, port, &options, &weight);
1027                                 if(n != 6) {
1028                                         fprintf(stderr, "Unable to parse edge dump from tincd.\n");
1029                                         return 1;
1030                                 }
1031
1032                                 if(do_graph) {
1033                                         float w = 1 + 65536.0 / weight;
1034                                         if(do_graph == 1 && strcmp(node1, node2) > 0)
1035                                                 printf(" %s -- %s [w = %f, weight = %f];\n", node1, node2, w, w);
1036                                         else if(do_graph == 2)
1037                                                 printf(" %s -> %s [w = %f, weight = %f];\n", node1, node2, w, w);
1038                                 } else {
1039                                         printf("%s to %s at %s port %s options %x weight %d\n", from, to, host, port, options, weight);
1040                                 }
1041                         } break;
1042
1043                         case REQ_DUMP_SUBNETS: {
1044                                 int n = sscanf(line, "%*d %*d %s %s", subnet, node);
1045                                 if(n != 2) {
1046                                         fprintf(stderr, "Unable to parse subnet dump from tincd.\n");
1047                                         return 1;
1048                                 }
1049                                 printf("%s owner %s\n", strip_weight(subnet), node);
1050                         } break;
1051
1052                         case REQ_DUMP_CONNECTIONS: {
1053                                 int n = sscanf(line, "%*d %*d %s %s port %s %x %d %x", node, host, port, &options, &socket, &status_int);
1054                                 if(n != 6) {
1055                                         fprintf(stderr, "Unable to parse connection dump from tincd.\n");
1056                                         return 1;
1057                                 }
1058                                 printf("%s at %s port %s options %x socket %d status %x\n", node, host, port, options, socket, status_int);
1059                         } break;
1060
1061                         default:
1062                                 fprintf(stderr, "Unable to parse dump from tincd.\n");
1063                                 return 1;
1064                 }
1065         }
1066
1067         fprintf(stderr, "Error receiving dump.\n");
1068         return 1;
1069 }
1070
1071 static int cmd_purge(int argc, char *argv[]) {
1072         if(argc > 1) {
1073                 fprintf(stderr, "Too many arguments!\n");
1074                 return 1;
1075         }
1076
1077         if(!connect_tincd(true))
1078                 return 1;
1079
1080         sendline(fd, "%d %d", CONTROL, REQ_PURGE);
1081         if(!recvline(fd, line, sizeof line) || sscanf(line, "%d %d %d", &code, &req, &result) != 3 || code != CONTROL || req != REQ_PURGE || result) {
1082                 fprintf(stderr, "Could not purge old information.\n");
1083                 return 1;
1084         }
1085
1086         return 0;
1087 }
1088
1089 static int cmd_debug(int argc, char *argv[]) {
1090         if(argc != 2) {
1091                 fprintf(stderr, "Invalid number of arguments.\n");
1092                 return 1;
1093         }
1094
1095         if(!connect_tincd(true))
1096                 return 1;
1097
1098         int debuglevel = atoi(argv[1]);
1099         int origlevel;
1100
1101         sendline(fd, "%d %d %d", CONTROL, REQ_SET_DEBUG, debuglevel);
1102         if(!recvline(fd, line, sizeof line) || sscanf(line, "%d %d %d", &code, &req, &origlevel) != 3 || code != CONTROL || req != REQ_SET_DEBUG) {
1103                 fprintf(stderr, "Could not set debug level.\n");
1104                 return 1;
1105         }
1106
1107         fprintf(stderr, "Old level %d, new level %d.\n", origlevel, debuglevel);
1108         return 0;
1109 }
1110
1111 static int cmd_retry(int argc, char *argv[]) {
1112         if(argc > 1) {
1113                 fprintf(stderr, "Too many arguments!\n");
1114                 return 1;
1115         }
1116
1117         if(!connect_tincd(true))
1118                 return 1;
1119
1120         sendline(fd, "%d %d", CONTROL, REQ_RETRY);
1121         if(!recvline(fd, line, sizeof line) || sscanf(line, "%d %d %d", &code, &req, &result) != 3 || code != CONTROL || req != REQ_RETRY || result) {
1122                 fprintf(stderr, "Could not retry outgoing connections.\n");
1123                 return 1;
1124         }
1125
1126         return 0;
1127 }
1128
1129 static int cmd_connect(int argc, char *argv[]) {
1130         if(argc != 2) {
1131                 fprintf(stderr, "Invalid number of arguments.\n");
1132                 return 1;
1133         }
1134
1135         if(!check_id(argv[1])) {
1136                 fprintf(stderr, "Invalid name for node.\n");
1137                 return 1;
1138         }
1139
1140         if(!connect_tincd(true))
1141                 return 1;
1142
1143         sendline(fd, "%d %d %s", CONTROL, REQ_CONNECT, argv[1]);
1144         if(!recvline(fd, line, sizeof line) || sscanf(line, "%d %d %d", &code, &req, &result) != 3 || code != CONTROL || req != REQ_CONNECT || result) {
1145                 fprintf(stderr, "Could not connect to %s.\n", argv[1]);
1146                 return 1;
1147         }
1148
1149         return 0;
1150 }
1151
1152 static int cmd_disconnect(int argc, char *argv[]) {
1153         if(argc != 2) {
1154                 fprintf(stderr, "Invalid number of arguments.\n");
1155                 return 1;
1156         }
1157
1158         if(!check_id(argv[1])) {
1159                 fprintf(stderr, "Invalid name for node.\n");
1160                 return 1;
1161         }
1162
1163         if(!connect_tincd(true))
1164                 return 1;
1165
1166         sendline(fd, "%d %d %s", CONTROL, REQ_DISCONNECT, argv[1]);
1167         if(!recvline(fd, line, sizeof line) || sscanf(line, "%d %d %d", &code, &req, &result) != 3 || code != CONTROL || req != REQ_DISCONNECT || result) {
1168                 fprintf(stderr, "Could not disconnect %s.\n", argv[1]);
1169                 return 1;
1170         }
1171
1172         return 0;
1173 }
1174
1175 static int cmd_top(int argc, char *argv[]) {
1176         if(argc > 1) {
1177                 fprintf(stderr, "Too many arguments!\n");
1178                 return 1;
1179         }
1180
1181 #ifdef HAVE_CURSES
1182         if(!connect_tincd(true))
1183                 return 1;
1184
1185         top(fd);
1186         return 0;
1187 #else
1188         fprintf(stderr, "This version of tinc was compiled without support for the curses library.\n");
1189         return 1;
1190 #endif
1191 }
1192
1193 static int cmd_pcap(int argc, char *argv[]) {
1194         if(argc > 2) {
1195                 fprintf(stderr, "Too many arguments!\n");
1196                 return 1;
1197         }
1198
1199         if(!connect_tincd(true))
1200                 return 1;
1201
1202         pcap(fd, stdout, argc > 1 ? atoi(argv[1]) : 0);
1203         return 0;
1204 }
1205
1206 #ifdef SIGINT
1207 static void sigint_handler(int sig) {
1208         fprintf(stderr, "\n");
1209         shutdown(fd, SHUT_RDWR);
1210 }
1211 #endif
1212
1213 static int cmd_log(int argc, char *argv[]) {
1214         if(argc > 2) {
1215                 fprintf(stderr, "Too many arguments!\n");
1216                 return 1;
1217         }
1218
1219         if(!connect_tincd(true))
1220                 return 1;
1221
1222 #ifdef SIGINT
1223         signal(SIGINT, sigint_handler);
1224 #endif
1225
1226         logcontrol(fd, stdout, argc > 1 ? atoi(argv[1]) : -1);
1227
1228 #ifdef SIGINT
1229         signal(SIGINT, SIG_DFL);
1230 #endif
1231
1232         close(fd);
1233         fd = -1;
1234         return 0;
1235 }
1236
1237 static int cmd_pid(int argc, char *argv[]) {
1238         if(argc > 1) {
1239                 fprintf(stderr, "Too many arguments!\n");
1240                 return 1;
1241         }
1242
1243         if(!connect_tincd(true) && !pid)
1244                 return 1;
1245
1246         printf("%d\n", pid);
1247         return 0;
1248 }
1249
1250 int rstrip(char *value) {
1251         int len = strlen(value);
1252         while(len && strchr("\t\r\n ", value[len - 1]))
1253                 value[--len] = 0;
1254         return len;
1255 }
1256
1257 char *get_my_name(bool verbose) {
1258         FILE *f = fopen(tinc_conf, "r");
1259         if(!f) {
1260                 if(verbose)
1261                         fprintf(stderr, "Could not open %s: %s\n", tinc_conf, strerror(errno));
1262                 return NULL;
1263         }
1264
1265         char buf[4096];
1266         char *value;
1267         while(fgets(buf, sizeof buf, f)) {
1268                 int len = strcspn(buf, "\t =");
1269                 value = buf + len;
1270                 value += strspn(value, "\t ");
1271                 if(*value == '=') {
1272                         value++;
1273                         value += strspn(value, "\t ");
1274                 }
1275                 if(!rstrip(value))
1276                         continue;
1277                 buf[len] = 0;
1278                 if(strcasecmp(buf, "Name"))
1279                         continue;
1280                 if(*value) {
1281                         fclose(f);
1282                         return strdup(value);
1283                 }
1284         }
1285
1286         fclose(f);
1287         if(verbose)
1288                 fprintf(stderr, "Could not find Name in %s.\n", tinc_conf);
1289         return NULL;
1290 }
1291
1292 const var_t variables[] = {
1293         /* Server configuration */
1294         {"AddressFamily", VAR_SERVER},
1295         {"AutoConnect", VAR_SERVER | VAR_SAFE},
1296         {"BindToAddress", VAR_SERVER | VAR_MULTIPLE},
1297         {"BindToInterface", VAR_SERVER},
1298         {"Broadcast", VAR_SERVER | VAR_SAFE},
1299         {"ConnectTo", VAR_SERVER | VAR_MULTIPLE | VAR_SAFE},
1300         {"DecrementTTL", VAR_SERVER},
1301         {"Device", VAR_SERVER},
1302         {"DeviceType", VAR_SERVER},
1303         {"DirectOnly", VAR_SERVER},
1304         {"ECDSAPrivateKeyFile", VAR_SERVER},
1305         {"ExperimentalProtocol", VAR_SERVER},
1306         {"Forwarding", VAR_SERVER},
1307         {"GraphDumpFile", VAR_SERVER | VAR_OBSOLETE},
1308         {"Hostnames", VAR_SERVER},
1309         {"IffOneQueue", VAR_SERVER},
1310         {"Interface", VAR_SERVER},
1311         {"KeyExpire", VAR_SERVER},
1312         {"LocalDiscovery", VAR_SERVER},
1313         {"MACExpire", VAR_SERVER},
1314         {"MaxConnectionBurst", VAR_SERVER},
1315         {"MaxOutputBufferSize", VAR_SERVER},
1316         {"MaxTimeout", VAR_SERVER},
1317         {"Mode", VAR_SERVER | VAR_SAFE},
1318         {"Name", VAR_SERVER},
1319         {"PingInterval", VAR_SERVER},
1320         {"PingTimeout", VAR_SERVER},
1321         {"PriorityInheritance", VAR_SERVER},
1322         {"PrivateKey", VAR_SERVER | VAR_OBSOLETE},
1323         {"PrivateKeyFile", VAR_SERVER},
1324         {"ProcessPriority", VAR_SERVER},
1325         {"Proxy", VAR_SERVER},
1326         {"ReplayWindow", VAR_SERVER},
1327         {"ScriptsExtension", VAR_SERVER},
1328         {"ScriptsInterpreter", VAR_SERVER},
1329         {"StrictSubnets", VAR_SERVER},
1330         {"TunnelServer", VAR_SERVER},
1331         {"UDPRcvBuf", VAR_SERVER},
1332         {"UDPSndBuf", VAR_SERVER},
1333         {"VDEGroup", VAR_SERVER},
1334         {"VDEPort", VAR_SERVER},
1335         /* Host configuration */
1336         {"Address", VAR_HOST | VAR_MULTIPLE},
1337         {"Cipher", VAR_SERVER | VAR_HOST},
1338         {"ClampMSS", VAR_SERVER | VAR_HOST},
1339         {"Compression", VAR_SERVER | VAR_HOST},
1340         {"Digest", VAR_SERVER | VAR_HOST},
1341         {"ECDSAPublicKey", VAR_HOST},
1342         {"ECDSAPublicKeyFile", VAR_SERVER | VAR_HOST},
1343         {"IndirectData", VAR_SERVER | VAR_HOST},
1344         {"MACLength", VAR_SERVER | VAR_HOST},
1345         {"PMTU", VAR_SERVER | VAR_HOST},
1346         {"PMTUDiscovery", VAR_SERVER | VAR_HOST},
1347         {"Port", VAR_HOST},
1348         {"PublicKey", VAR_HOST | VAR_OBSOLETE},
1349         {"PublicKeyFile", VAR_SERVER | VAR_HOST | VAR_OBSOLETE},
1350         {"Subnet", VAR_HOST | VAR_MULTIPLE | VAR_SAFE},
1351         {"TCPOnly", VAR_SERVER | VAR_HOST},
1352         {"Weight", VAR_HOST | VAR_SAFE},
1353         {NULL, 0}
1354 };
1355
1356 static int cmd_config(int argc, char *argv[]) {
1357         if(argc < 2) {
1358                 fprintf(stderr, "Invalid number of arguments.\n");
1359                 return 1;
1360         }
1361
1362         if(strcasecmp(argv[0], "config"))
1363                 argv--, argc++;
1364
1365         int action = -2;
1366         if(!strcasecmp(argv[1], "get")) {
1367                 argv++, argc--;
1368         } else if(!strcasecmp(argv[1], "add")) {
1369                 argv++, argc--, action = 1;
1370         } else if(!strcasecmp(argv[1], "del")) {
1371                 argv++, argc--, action = -1;
1372         } else if(!strcasecmp(argv[1], "replace") || !strcasecmp(argv[1], "set") || !strcasecmp(argv[1], "change")) {
1373                 argv++, argc--, action = 0;
1374         }
1375
1376         if(argc < 2) {
1377                 fprintf(stderr, "Invalid number of arguments.\n");
1378                 return 1;
1379         }
1380
1381         // Concatenate the rest of the command line
1382         strncpy(line, argv[1], sizeof line - 1);
1383         for(int i = 2; i < argc; i++) {
1384                 strncat(line, " ", sizeof line - 1 - strlen(line));
1385                 strncat(line, argv[i], sizeof line - 1 - strlen(line));
1386         }
1387
1388         // Liberal parsing into node name, variable name and value.
1389         char *node = NULL;
1390         char *variable;
1391         char *value;
1392         int len;
1393
1394         len = strcspn(line, "\t =");
1395         value = line + len;
1396         value += strspn(value, "\t ");
1397         if(*value == '=') {
1398                 value++;
1399                 value += strspn(value, "\t ");
1400         }
1401         line[len] = '\0';
1402         variable = strchr(line, '.');
1403         if(variable) {
1404                 node = line;
1405                 *variable++ = 0;
1406         } else {
1407                 variable = line;
1408         }
1409
1410         if(!*variable) {
1411                 fprintf(stderr, "No variable given.\n");
1412                 return 1;
1413         }
1414
1415         if(action >= 0 && !*value) {
1416                 fprintf(stderr, "No value for variable given.\n");
1417                 return 1;
1418         }
1419
1420         if(action < -1 && *value)
1421                 action = 0;
1422
1423         /* Some simple checks. */
1424         bool found = false;
1425         bool warnonremove = false;
1426
1427         for(int i = 0; variables[i].name; i++) {
1428                 if(strcasecmp(variables[i].name, variable))
1429                         continue;
1430
1431                 found = true;
1432                 variable = (char *)variables[i].name;
1433
1434                 /* Discourage use of obsolete variables. */
1435
1436                 if(variables[i].type & VAR_OBSOLETE && action >= 0) {
1437                         if(force) {
1438                                 fprintf(stderr, "Warning: %s is an obsolete variable!\n", variable);
1439                         } else {
1440                                 fprintf(stderr, "%s is an obsolete variable! Use --force to use it anyway.\n", variable);
1441                                 return 1;
1442                         }
1443                 }
1444
1445                 /* Don't put server variables in host config files */
1446
1447                 if(node && !(variables[i].type & VAR_HOST) && action >= 0) {
1448                         if(force) {
1449                                 fprintf(stderr, "Warning: %s is not a host configuration variable!\n", variable);
1450                         } else {
1451                                 fprintf(stderr, "%s is not a host configuration variable! Use --force to use it anyway.\n", variable);
1452                                 return 1;
1453                         }
1454                 }
1455
1456                 /* Should this go into our own host config file? */
1457
1458                 if(!node && !(variables[i].type & VAR_SERVER)) {
1459                         node = get_my_name(true);
1460                         if(!node)
1461                                 return 1;
1462                 }
1463
1464                 /* Change "add" into "set" for variables that do not allow multiple occurences.
1465                    Turn on warnings when it seems variables might be removed unintentionally. */
1466
1467                 if(action == 1 && !(variables[i].type & VAR_MULTIPLE)) {
1468                         warnonremove = true;
1469                         action = 0;
1470                 } else if(action == 0 && (variables[i].type & VAR_MULTIPLE)) {
1471                         warnonremove = true;
1472                 }
1473
1474                 break;
1475         }
1476
1477         if(node && !check_id(node)) {
1478                 fprintf(stderr, "Invalid name for node.\n");
1479                 return 1;
1480         }
1481
1482         if(!found) {
1483                 if(force || action < 0) {
1484                         fprintf(stderr, "Warning: %s is not a known configuration variable!\n", variable);
1485                 } else {
1486                         fprintf(stderr, "%s: is not a known configuration variable! Use --force to use it anyway.\n", variable);
1487                         return 1;
1488                 }
1489         }
1490
1491         // Open the right configuration file.
1492         char *filename;
1493         if(node)
1494                 xasprintf(&filename, "%s" SLASH "%s", hosts_dir, node);
1495         else
1496                 filename = tinc_conf;
1497
1498         FILE *f = fopen(filename, "r");
1499         if(!f) {
1500                 fprintf(stderr, "Could not open configuration file %s: %s\n", filename, strerror(errno));
1501                 return 1;
1502         }
1503
1504         char *tmpfile = NULL;
1505         FILE *tf = NULL;
1506
1507         if(action >= -1) {
1508                 xasprintf(&tmpfile, "%s.config.tmp", filename);
1509                 tf = fopen(tmpfile, "w");
1510                 if(!tf) {
1511                         fprintf(stderr, "Could not open temporary file %s: %s\n", tmpfile, strerror(errno));
1512                         fclose(f);
1513                         return 1;
1514                 }
1515         }
1516
1517         // Copy the file, making modifications on the fly, unless we are just getting a value.
1518         char buf1[4096];
1519         char buf2[4096];
1520         bool set = false;
1521         bool removed = false;
1522         found = false;
1523
1524         while(fgets(buf1, sizeof buf1, f)) {
1525                 buf1[sizeof buf1 - 1] = 0;
1526                 strncpy(buf2, buf1, sizeof buf2);
1527
1528                 // Parse line in a simple way
1529                 char *bvalue;
1530                 int len;
1531
1532                 len = strcspn(buf2, "\t =");
1533                 bvalue = buf2 + len;
1534                 bvalue += strspn(bvalue, "\t ");
1535                 if(*bvalue == '=') {
1536                         bvalue++;
1537                         bvalue += strspn(bvalue, "\t ");
1538                 }
1539                 rstrip(bvalue);
1540                 buf2[len] = '\0';
1541
1542                 // Did it match?
1543                 if(!strcasecmp(buf2, variable)) {
1544                         // Get
1545                         if(action < -1) {
1546                                 found = true;
1547                                 printf("%s\n", bvalue);
1548                         // Del
1549                         } else if(action == -1) {
1550                                 if(!*value || !strcasecmp(bvalue, value)) {
1551                                         removed = true;
1552                                         continue;
1553                                 }
1554                         // Set
1555                         } else if(action == 0) {
1556                                 // Warn if "set" was used for variables that can occur multiple times
1557                                 if(warnonremove && strcasecmp(bvalue, value))
1558                                         fprintf(stderr, "Warning: removing %s = %s\n", variable, bvalue);
1559
1560                                 // Already set? Delete the rest...
1561                                 if(set)
1562                                         continue;
1563
1564                                 // Otherwise, replace.
1565                                 if(fprintf(tf, "%s = %s\n", variable, value) < 0) {
1566                                         fprintf(stderr, "Error writing to temporary file %s: %s\n", tmpfile, strerror(errno));
1567                                         return 1;
1568                                 }
1569                                 set = true;
1570                                 continue;
1571                         }
1572                 }
1573
1574                 if(action >= -1) {
1575                         // Copy original line...
1576                         if(fputs(buf1, tf) < 0) {
1577                                 fprintf(stderr, "Error writing to temporary file %s: %s\n", tmpfile, strerror(errno));
1578                                 return 1;
1579                         }
1580
1581                         // Add newline if it is missing...
1582                         if(*buf1 && buf1[strlen(buf1) - 1] != '\n') {
1583                                 if(fputc('\n', tf) < 0) {
1584                                         fprintf(stderr, "Error writing to temporary file %s: %s\n", tmpfile, strerror(errno));
1585                                         return 1;
1586                                 }
1587                         }
1588                 }
1589         }
1590
1591         // Make sure we read everything...
1592         if(ferror(f) || !feof(f)) {
1593                 fprintf(stderr, "Error while reading from configuration file %s: %s\n", filename, strerror(errno));
1594                 return 1;
1595         }
1596
1597         if(fclose(f)) {
1598                 fprintf(stderr, "Error closing configuration file %s: %s\n", filename, strerror(errno));
1599                 return 1;
1600         }
1601
1602         // Add new variable if necessary.
1603         if(action > 0 || (action == 0 && !set)) {
1604                 if(fprintf(tf, "%s = %s\n", variable, value) < 0) {
1605                         fprintf(stderr, "Error writing to temporary file %s: %s\n", tmpfile, strerror(errno));
1606                         return 1;
1607                 }
1608         }
1609
1610         if(action < -1) {
1611                 if(!found)
1612                         fprintf(stderr, "No matching configuration variables found.\n");
1613                 return 0;
1614         }
1615
1616         // Make sure we wrote everything...
1617         if(fclose(tf)) {
1618                 fprintf(stderr, "Error closing temporary file %s: %s\n", tmpfile, strerror(errno));
1619                 return 1;
1620         }
1621
1622         // Could we find what we had to remove?
1623         if(action < 0 && !removed) {
1624                 remove(tmpfile);
1625                 fprintf(stderr, "No configuration variables deleted.\n");
1626                 return *value;
1627         }
1628
1629         // Replace the configuration file with the new one
1630 #ifdef HAVE_MINGW
1631         if(remove(filename)) {
1632                 fprintf(stderr, "Error replacing file %s: %s\n", filename, strerror(errno));
1633                 return 1;
1634         }
1635 #endif
1636         if(rename(tmpfile, filename)) {
1637                 fprintf(stderr, "Error renaming temporary file %s to configuration file %s: %s\n", tmpfile, filename, strerror(errno));
1638                 return 1;
1639         }
1640
1641         // Silently try notifying a running tincd of changes.
1642         if(connect_tincd(false))
1643                 sendline(fd, "%d %d", CONTROL, REQ_RELOAD);
1644
1645         return 0;
1646 }
1647
1648 bool check_id(const char *name) {
1649         if(!name || !*name)
1650                 return false;
1651
1652         for(int i = 0; i < strlen(name); i++) {
1653                 if(!isalnum(name[i]) && name[i] != '_')
1654                         return false;
1655         }
1656
1657         return true;
1658 }
1659
1660 static bool try_bind(int port) {
1661         struct addrinfo *ai = NULL;
1662         struct addrinfo hint = {
1663                 .ai_flags = AI_PASSIVE,
1664                 .ai_family = AF_UNSPEC,
1665                 .ai_socktype = SOCK_STREAM,
1666                 .ai_protocol = IPPROTO_TCP,
1667         };
1668
1669         char portstr[16];
1670         snprintf(portstr, sizeof portstr, "%d", port);
1671
1672         if(getaddrinfo(NULL, portstr, &hint, &ai) || !ai)
1673                 return false;
1674
1675         while(ai) {
1676                 int fd = socket(ai->ai_family, SOCK_STREAM, IPPROTO_TCP);
1677                 if(!fd)
1678                         return false;
1679                 int result = bind(fd, ai->ai_addr, ai->ai_addrlen);
1680                 closesocket(fd);
1681                 if(result)
1682                         return false;
1683                 ai = ai->ai_next;
1684         }
1685
1686         return true;
1687 }
1688
1689 int check_port(char *name) {
1690         if(try_bind(655))
1691                 return 655;
1692
1693         fprintf(stderr, "Warning: could not bind to port 655. ");
1694
1695         for(int i = 0; i < 100; i++) {
1696                 int port = 0x1000 + (rand() & 0x7fff);
1697                 if(try_bind(port)) {
1698                         char *filename;
1699                         xasprintf(&filename, "%s" SLASH "hosts" SLASH "%s", confbase, name);
1700                         FILE *f = fopen(filename, "a");
1701                         free(filename);
1702                         if(!f) {
1703                                 fprintf(stderr, "Please change tinc's Port manually.\n");
1704                                 return 0;
1705                         }
1706
1707                         fprintf(f, "Port = %d\n", port);
1708                         fclose(f);
1709                         fprintf(stderr, "Tinc will instead listen on port %d.\n", port);
1710                         return port;
1711                 }
1712         }
1713
1714         fprintf(stderr, "Please change tinc's Port manually.\n");
1715         return 0;
1716 }
1717
1718 static int cmd_init(int argc, char *argv[]) {
1719         if(!access(tinc_conf, F_OK)) {
1720                 fprintf(stderr, "Configuration file %s already exists!\n", tinc_conf);
1721                 return 1;
1722         }
1723
1724         if(argc > 2) {
1725                 fprintf(stderr, "Too many arguments!\n");
1726                 return 1;
1727         } else if(argc < 2) {
1728                 if(tty) {
1729                         char buf[1024];
1730                         fprintf(stdout, "Enter the Name you want your tinc node to have: ");
1731                         fflush(stdout);
1732                         if(!fgets(buf, sizeof buf, stdin)) {
1733                                 fprintf(stderr, "Error while reading stdin: %s\n", strerror(errno));
1734                                 return 1;
1735                         }
1736                         int len = rstrip(buf);
1737                         if(!len) {
1738                                 fprintf(stderr, "No name given!\n");
1739                                 return 1;
1740                         }
1741                         name = strdup(buf);
1742                 } else {
1743                         fprintf(stderr, "No Name given!\n");
1744                         return 1;
1745                 }
1746         } else {
1747                 name = strdup(argv[1]);
1748                 if(!*name) {
1749                         fprintf(stderr, "No Name given!\n");
1750                         return 1;
1751                 }
1752         }
1753
1754         if(!check_id(name)) {
1755                 fprintf(stderr, "Invalid Name! Only a-z, A-Z, 0-9 and _ are allowed characters.\n");
1756                 return 1;
1757         }
1758
1759         if(mkdir(confdir, 0755) && errno != EEXIST) {
1760                 fprintf(stderr, "Could not create directory %s: %s\n", CONFDIR, strerror(errno));
1761                 return 1;
1762         }
1763
1764         if(mkdir(confbase, 0755) && errno != EEXIST) {
1765                 fprintf(stderr, "Could not create directory %s: %s\n", confbase, strerror(errno));
1766                 return 1;
1767         }
1768
1769         if(mkdir(hosts_dir, 0755) && errno != EEXIST) {
1770                 fprintf(stderr, "Could not create directory %s: %s\n", hosts_dir, strerror(errno));
1771                 return 1;
1772         }
1773
1774         FILE *f = fopen(tinc_conf, "w");
1775         if(!f) {
1776                 fprintf(stderr, "Could not create file %s: %s\n", tinc_conf, strerror(errno));
1777                 return 1;
1778         }
1779
1780         fprintf(f, "Name = %s\n", name);
1781         fclose(f);
1782
1783         if(!rsa_keygen(2048, false) || !ecdsa_keygen(false))
1784                 return 1;
1785
1786         check_port(name);
1787
1788 #ifndef HAVE_MINGW
1789         char *filename;
1790         xasprintf(&filename, "%s" SLASH "tinc-up", confbase);
1791         if(access(filename, F_OK)) {
1792                 FILE *f = fopen(filename, "w");
1793                 if(!f) {
1794                         fprintf(stderr, "Could not create file %s: %s\n", filename, strerror(errno));
1795                         return 1;
1796                 }
1797                 mode_t mask = umask(0);
1798                 umask(mask);
1799                 fchmod(fileno(f), 0755 & ~mask);
1800                 fprintf(f, "#!/bin/sh\n\necho 'Unconfigured tinc-up script, please edit!'\n\n#ifconfig $INTERFACE <your vpn IP address> netmask <netmask of whole VPN>\n");
1801                 fclose(f);
1802         }
1803 #endif
1804
1805         return 0;
1806
1807 }
1808
1809 static int cmd_generate_keys(int argc, char *argv[]) {
1810         if(argc > 2) {
1811                 fprintf(stderr, "Too many arguments!\n");
1812                 return 1;
1813         }
1814
1815         if(!name)
1816                 name = get_my_name(false);
1817
1818         return !(rsa_keygen(argc > 1 ? atoi(argv[1]) : 2048, true) && ecdsa_keygen(true));
1819 }
1820
1821 static int cmd_generate_rsa_keys(int argc, char *argv[]) {
1822         if(argc > 2) {
1823                 fprintf(stderr, "Too many arguments!\n");
1824                 return 1;
1825         }
1826
1827         if(!name)
1828                 name = get_my_name(false);
1829
1830         return !rsa_keygen(argc > 1 ? atoi(argv[1]) : 2048, true);
1831 }
1832
1833 static int cmd_generate_ecdsa_keys(int argc, char *argv[]) {
1834         if(argc > 1) {
1835                 fprintf(stderr, "Too many arguments!\n");
1836                 return 1;
1837         }
1838
1839         if(!name)
1840                 name = get_my_name(false);
1841
1842         return !ecdsa_keygen(true);
1843 }
1844
1845 static int cmd_help(int argc, char *argv[]) {
1846         usage(false);
1847         return 0;
1848 }
1849
1850 static int cmd_version(int argc, char *argv[]) {
1851         if(argc > 1) {
1852                 fprintf(stderr, "Too many arguments!\n");
1853                 return 1;
1854         }
1855
1856         version();
1857         return 0;
1858 }
1859
1860 static int cmd_info(int argc, char *argv[]) {
1861         if(argc != 2) {
1862                 fprintf(stderr, "Invalid number of arguments.\n");
1863                 return 1;
1864         }
1865
1866         if(!connect_tincd(true))
1867                 return 1;
1868
1869         return info(fd, argv[1]);
1870 }
1871
1872 static const char *conffiles[] = {
1873         "tinc.conf",
1874         "tinc-up",
1875         "tinc-down",
1876         "subnet-up",
1877         "subnet-down",
1878         "host-up",
1879         "host-down",
1880         NULL,
1881 };
1882
1883 static int cmd_edit(int argc, char *argv[]) {
1884         if(argc != 2) {
1885                 fprintf(stderr, "Invalid number of arguments.\n");
1886                 return 1;
1887         }
1888
1889         char *filename = NULL;
1890
1891         if(strncmp(argv[1], "hosts" SLASH, 6)) {
1892                 for(int i = 0; conffiles[i]; i++) {
1893                         if(!strcmp(argv[1], conffiles[i])) {
1894                                 xasprintf(&filename, "%s" SLASH "%s", confbase, argv[1]);
1895                                 break;
1896                         }
1897                 }
1898         } else {
1899                 argv[1] += 6;
1900         }
1901
1902         if(!filename) {
1903                 xasprintf(&filename, "%s" SLASH "%s", hosts_dir, argv[1]);
1904                 char *dash = strchr(argv[1], '-');
1905                 if(dash) {
1906                         *dash++ = 0;
1907                         if((strcmp(dash, "up") && strcmp(dash, "down")) || !check_id(argv[1])) {
1908                                 fprintf(stderr, "Invalid configuration filename.\n");
1909                                 return 1;
1910                         }
1911                 }
1912         }
1913
1914         char *command;
1915 #ifndef HAVE_MINGW
1916         xasprintf(&command, "\"%s\" \"%s\"", getenv("VISUAL") ?: getenv("EDITOR") ?: "vi", filename);
1917 #else
1918         xasprintf(&command, "edit \"%s\"", filename);
1919 #endif
1920         int result = system(command);
1921         if(result)
1922                 return result;
1923
1924         // Silently try notifying a running tincd of changes.
1925         if(connect_tincd(false))
1926                 sendline(fd, "%d %d", CONTROL, REQ_RELOAD);
1927
1928         return 0;
1929 }
1930
1931 static int export(const char *name, FILE *out) {
1932         char *filename;
1933         xasprintf(&filename, "%s" SLASH "%s", hosts_dir, name);
1934         FILE *in = fopen(filename, "r");
1935         if(!in) {
1936                 fprintf(stderr, "Could not open configuration file %s: %s\n", filename, strerror(errno));
1937                 return 1;
1938         }
1939
1940         fprintf(out, "Name = %s\n", name);
1941         char buf[4096];
1942         while(fgets(buf, sizeof buf, in)) {
1943                 if(strcspn(buf, "\t =") != 4 || strncasecmp(buf, "Name", 4))
1944                         fputs(buf, out);
1945         }
1946
1947         if(ferror(in)) {
1948                 fprintf(stderr, "Error while reading configuration file %s: %s\n", filename, strerror(errno));
1949                 fclose(in);
1950                 return 1;
1951         }
1952
1953         fclose(in);
1954         return 0;
1955 }
1956
1957 static int cmd_export(int argc, char *argv[]) {
1958         if(argc > 1) {
1959                 fprintf(stderr, "Too many arguments!\n");
1960                 return 1;
1961         }
1962
1963         char *name = get_my_name(true);
1964         if(!name)
1965                 return 1;
1966
1967         int result = export(name, stdout);
1968         if(!tty)
1969                 fclose(stdout);
1970
1971         free(name);
1972         return result;
1973 }
1974
1975 static int cmd_export_all(int argc, char *argv[]) {
1976         if(argc > 1) {
1977                 fprintf(stderr, "Too many arguments!\n");
1978                 return 1;
1979         }
1980
1981         DIR *dir = opendir(hosts_dir);
1982         if(!dir) {
1983                 fprintf(stderr, "Could not open host configuration directory %s: %s\n", hosts_dir, strerror(errno));
1984                 return 1;
1985         }
1986
1987         bool first = true;
1988         int result = 0;
1989         struct dirent *ent;
1990
1991         while((ent = readdir(dir))) {
1992                 if(!check_id(ent->d_name))
1993                         continue;
1994
1995                 if(first)
1996                         first = false;
1997                 else
1998                         printf("#---------------------------------------------------------------#\n");
1999
2000                 result |= export(ent->d_name, stdout);
2001         }
2002
2003         closedir(dir);
2004         if(!tty)
2005                 fclose(stdout);
2006         return result;
2007 }
2008
2009 static int cmd_import(int argc, char *argv[]) {
2010         if(argc > 1) {
2011                 fprintf(stderr, "Too many arguments!\n");
2012                 return 1;
2013         }
2014
2015         FILE *in = stdin;
2016         FILE *out = NULL;
2017
2018         char buf[4096];
2019         char name[4096];
2020         char *filename = NULL;
2021         int count = 0;
2022         bool firstline = true;
2023
2024         while(fgets(buf, sizeof buf, in)) {
2025                 if(sscanf(buf, "Name = %s", name) == 1) {
2026                         firstline = false;
2027
2028                         if(!check_id(name)) {
2029                                 fprintf(stderr, "Invalid Name in input!\n");
2030                                 return 1;
2031                         }
2032
2033                         if(out)
2034                                 fclose(out);
2035
2036                         free(filename);
2037                         xasprintf(&filename, "%s" SLASH "%s", hosts_dir, name);
2038
2039                         if(!force && !access(filename, F_OK)) {
2040                                 fprintf(stderr, "Host configuration file %s already exists, skipping.\n", filename);
2041                                 out = NULL;
2042                                 continue;
2043                         }
2044
2045                         out = fopen(filename, "w");
2046                         if(!out) {
2047                                 fprintf(stderr, "Error creating configuration file %s: %s\n", filename, strerror(errno));
2048                                 return 1;
2049                         }
2050
2051                         count++;
2052                         continue;
2053                 } else if(firstline) {
2054                         fprintf(stderr, "Junk at the beginning of the input, ignoring.\n");
2055                         firstline = false;
2056                 }
2057
2058
2059                 if(!strcmp(buf, "#---------------------------------------------------------------#\n"))
2060                         continue;
2061
2062                 if(out) {
2063                         if(fputs(buf, out) < 0) {
2064                                 fprintf(stderr, "Error writing to host configuration file %s: %s\n", filename, strerror(errno));
2065                                 return 1;
2066                         }
2067                 }
2068         }
2069
2070         if(out)
2071                 fclose(out);
2072
2073         if(count) {
2074                 fprintf(stderr, "Imported %d host configuration files.\n", count);
2075                 return 0;
2076         } else {
2077                 fprintf(stderr, "No host configuration files imported.\n");
2078                 return 1;
2079         }
2080 }
2081
2082 static int cmd_exchange(int argc, char *argv[]) {
2083         return cmd_export(argc, argv) ?: cmd_import(argc, argv);
2084 }
2085
2086 static int cmd_exchange_all(int argc, char *argv[]) {
2087         return cmd_export_all(argc, argv) ?: cmd_import(argc, argv);
2088 }
2089
2090 static const struct {
2091         const char *command;
2092         int (*function)(int argc, char *argv[]);
2093         bool hidden;
2094 } commands[] = {
2095         {"start", cmd_start},
2096         {"stop", cmd_stop},
2097         {"restart", cmd_restart},
2098         {"reload", cmd_reload},
2099         {"dump", cmd_dump},
2100         {"purge", cmd_purge},
2101         {"debug", cmd_debug},
2102         {"retry", cmd_retry},
2103         {"connect", cmd_connect},
2104         {"disconnect", cmd_disconnect},
2105         {"top", cmd_top},
2106         {"pcap", cmd_pcap},
2107         {"log", cmd_log},
2108         {"pid", cmd_pid},
2109         {"config", cmd_config, true},
2110         {"add", cmd_config},
2111         {"del", cmd_config},
2112         {"get", cmd_config},
2113         {"set", cmd_config},
2114         {"init", cmd_init},
2115         {"generate-keys", cmd_generate_keys},
2116         {"generate-rsa-keys", cmd_generate_rsa_keys},
2117         {"generate-ecdsa-keys", cmd_generate_ecdsa_keys},
2118         {"help", cmd_help},
2119         {"version", cmd_version},
2120         {"info", cmd_info},
2121         {"edit", cmd_edit},
2122         {"export", cmd_export},
2123         {"export-all", cmd_export_all},
2124         {"import", cmd_import},
2125         {"exchange", cmd_exchange},
2126         {"exchange-all", cmd_exchange_all},
2127         {"invite", cmd_invite},
2128         {"join", cmd_join},
2129         {NULL, NULL},
2130 };
2131
2132 #ifdef HAVE_READLINE
2133 static char *complete_command(const char *text, int state) {
2134         static int i;
2135
2136         if(!state)
2137                 i = 0;
2138         else
2139                 i++;
2140
2141         while(commands[i].command) {
2142                 if(!commands[i].hidden && !strncasecmp(commands[i].command, text, strlen(text)))
2143                         return xstrdup(commands[i].command);
2144                 i++;
2145         }
2146
2147         return NULL;
2148 }
2149
2150 static char *complete_dump(const char *text, int state) {
2151         const char *matches[] = {"reachable", "nodes", "edges", "subnets", "connections", "graph", NULL};
2152         static int i;
2153
2154         if(!state)
2155                 i = 0;
2156         else
2157                 i++;
2158
2159         while(matches[i]) {
2160                 if(!strncasecmp(matches[i], text, strlen(text)))
2161                         return xstrdup(matches[i]);
2162                 i++;
2163         }
2164
2165         return NULL;
2166 }
2167
2168 static char *complete_config(const char *text, int state) {
2169         static int i;
2170
2171         if(!state)
2172                 i = 0;
2173         else
2174                 i++;
2175
2176         while(variables[i].name) {
2177                 char *dot = strchr(text, '.');
2178                 if(dot) {
2179                         if((variables[i].type & VAR_HOST) && !strncasecmp(variables[i].name, dot + 1, strlen(dot + 1))) {
2180                                 char *match;
2181                                 xasprintf(&match, "%.*s.%s", (int)(dot - text), text, variables[i].name);
2182                                 return match;
2183                         }
2184                 } else {
2185                         if(!strncasecmp(variables[i].name, text, strlen(text)))
2186                                 return xstrdup(variables[i].name);
2187                 }
2188                 i++;
2189         }
2190
2191         return NULL;
2192 }
2193
2194 static char *complete_info(const char *text, int state) {
2195         static int i;
2196         if(!state) {
2197                 i = 0;
2198                 if(!connect_tincd(false))
2199                         return NULL;
2200                 // Check the list of nodes
2201                 sendline(fd, "%d %d", CONTROL, REQ_DUMP_NODES);
2202                 sendline(fd, "%d %d", CONTROL, REQ_DUMP_SUBNETS);
2203         }
2204
2205         while(recvline(fd, line, sizeof line)) {
2206                 char item[4096];
2207                 int n = sscanf(line, "%d %d %s", &code, &req, item);
2208                 if(n == 2) {
2209                         i++;
2210                         if(i >= 2)
2211                                 break;
2212                         else
2213                                 continue;
2214                 }
2215
2216                 if(n != 3) {
2217                         fprintf(stderr, "Unable to parse dump from tincd, n = %d, i = %d.\n", n, i);
2218                         break;
2219                 }
2220
2221                 if(!strncmp(item, text, strlen(text)))
2222                         return xstrdup(strip_weight(item));
2223         }
2224
2225         return NULL;
2226 }
2227
2228 static char *complete_nothing(const char *text, int state) {
2229         return NULL;
2230 }
2231
2232 static char **completion (const char *text, int start, int end) {
2233         char **matches = NULL;
2234
2235         if(!start)
2236                 matches = rl_completion_matches(text, complete_command);
2237         else if(!strncasecmp(rl_line_buffer, "dump ", 5))
2238                 matches = rl_completion_matches(text, complete_dump);
2239         else if(!strncasecmp(rl_line_buffer, "add ", 4))
2240                 matches = rl_completion_matches(text, complete_config);
2241         else if(!strncasecmp(rl_line_buffer, "del ", 4))
2242                 matches = rl_completion_matches(text, complete_config);
2243         else if(!strncasecmp(rl_line_buffer, "get ", 4))
2244                 matches = rl_completion_matches(text, complete_config);
2245         else if(!strncasecmp(rl_line_buffer, "set ", 4))
2246                 matches = rl_completion_matches(text, complete_config);
2247         else if(!strncasecmp(rl_line_buffer, "info ", 5))
2248                 matches = rl_completion_matches(text, complete_info);
2249
2250         return matches;
2251 }
2252 #endif
2253
2254 static int cmd_shell(int argc, char *argv[]) {
2255         char *prompt;
2256         xasprintf(&prompt, "%s> ", identname);
2257         int result = 0;
2258         char buf[4096];
2259         char *line = NULL;
2260         int maxargs = argc + 16;
2261         char **nargv = xmalloc(maxargs * sizeof *nargv);
2262
2263         for(int i = 0; i < argc; i++)
2264                 nargv[i] = argv[i];
2265
2266 #ifdef HAVE_READLINE
2267         rl_readline_name = "tinc";
2268         rl_completion_entry_function = complete_nothing;
2269         rl_attempted_completion_function = completion;
2270         rl_filename_completion_desired = 0;
2271         char *copy = NULL;
2272 #endif
2273
2274         while(true) {
2275 #ifdef HAVE_READLINE
2276                 if(tty) {
2277                         free(copy);
2278                         free(line);
2279                         rl_basic_word_break_characters = "\t\n ";
2280                         line = readline(prompt);
2281                         if(line)
2282                                 copy = xstrdup(line);
2283                 } else {
2284                         line = fgets(buf, sizeof buf, stdin);
2285                 }
2286 #else
2287                 if(tty)
2288                         fputs(prompt, stdout);
2289
2290                 line = fgets(buf, sizeof buf, stdin);
2291 #endif
2292
2293                 if(!line)
2294                         break;
2295
2296                 /* Ignore comments */
2297
2298                 if(*line == '#')
2299                         continue;
2300
2301                 /* Split */
2302
2303                 int nargc = argc;
2304                 char *p = line + strspn(line, " \t\n");
2305                 char *next = strtok(p, " \t\n");
2306
2307                 while(p && *p) {
2308                         if(nargc >= maxargs) {
2309                                 fprintf(stderr, "next %p '%s', p %p '%s'\n", next, next, p, p);
2310                                 abort();
2311                                 maxargs *= 2;
2312                                 nargv = xrealloc(nargv, maxargs * sizeof *nargv);
2313                         }
2314
2315                         nargv[nargc++] = p;
2316                         p = next;
2317                         next = strtok(NULL, " \t\n");
2318                 }
2319
2320                 if(nargc == argc)
2321                         continue;
2322
2323                 if(!strcasecmp(nargv[argc], "exit") || !strcasecmp(nargv[argc], "quit"))
2324                         return result;
2325
2326                 bool found = false;
2327
2328                 for(int i = 0; commands[i].command; i++) {
2329                         if(!strcasecmp(nargv[argc], commands[i].command)) {
2330                                 result |= commands[i].function(nargc - argc - 1, nargv + argc + 1);
2331                                 found = true;
2332                                 break;
2333                         }
2334                 }
2335
2336 #ifdef HAVE_READLINE
2337                 if(tty && found)
2338                         add_history(copy);
2339 #endif
2340
2341                 if(!found) {
2342                         fprintf(stderr, "Unknown command `%s'.\n", nargv[argc]);
2343                         result |= 1;
2344                 }
2345         }
2346
2347         free(nargv);
2348
2349         if(tty)
2350                 printf("\n");
2351         return result;
2352 }
2353
2354
2355 int main(int argc, char *argv[]) {
2356         program_name = argv[0];
2357         orig_argv = argv;
2358         orig_argc = argc;
2359
2360         if(!parse_options(argc, argv))
2361                 return 1;
2362
2363         make_names();
2364         xasprintf(&tinc_conf, "%s" SLASH "tinc.conf", confbase);
2365         xasprintf(&hosts_dir, "%s" SLASH "hosts", confbase);
2366
2367         if(show_version) {
2368                 version();
2369                 return 0;
2370         }
2371
2372         if(show_help) {
2373                 usage(false);
2374                 return 0;
2375         }
2376
2377         srand(time(NULL));
2378         crypto_init();
2379
2380         tty = isatty(0) && isatty(1);
2381
2382         if(optind >= argc)
2383                 return cmd_shell(argc, argv);
2384
2385         for(int i = 0; commands[i].command; i++) {
2386                 if(!strcasecmp(argv[optind], commands[i].command))
2387                         return commands[i].function(argc - optind, argv + optind);
2388         }
2389
2390         fprintf(stderr, "Unknown command `%s'.\n", argv[optind]);
2391         usage(true);
2392         return 1;
2393 }