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

   1 /*
   2     tincctl.c -- Controlling a running tincd
   3     Copyright (C) 2007-2012 Guus Sliepen <guus@tinc-vpn.org>
   4
   5     This program is free software; you can redistribute it and/or modify
   6     it under the terms of the GNU General Public License as published by
   7     the Free Software Foundation; either version 2 of the License, or
   8     (at your option) any later version.
   9
  10     This program is distributed in the hope that it will be useful,
  11     but WITHOUT ANY WARRANTY; without even the implied warranty of
  12     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13     GNU General Public License for more details.
  14
  15     You should have received a copy of the GNU General Public License along
  16     with this program; if not, write to the Free Software Foundation, Inc.,
  17     51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  18 */
  19
  20 #include "system.h"
  21
  22 #include <getopt.h>
  23
  24 #ifdef HAVE_READLINE
  25 #include "readline/readline.h"
  26 #include "readline/history.h"
  27 #endif
  28
  29 #include "xalloc.h"
  30 #include "protocol.h"
  31 #include "control_common.h"
  32 #include "ecdsagen.h"
  33 #include "info.h"
  34 #include "rsagen.h"
  35 #include "utils.h"
  36 #include "tincctl.h"
  37 #include "top.h"
  38
  39 #ifdef HAVE_MINGW
  40 #define mkdir(a, b) mkdir(a)
  41 #endif
  42
  43
  44 /* The name this program was run with. */
  45 static char *program_name = NULL;
  46
  47 static char **orig_argv;
  48 static int orig_argc;
  49
  50 /* If nonzero, display usage information and exit. */
  51 static bool show_help = false;
  52
  53 /* If nonzero, print the version on standard output and exit.  */
  54 static bool show_version = false;
  55
  56 static char *name = NULL;
  57 static char *identname = NULL;                          /* program name for syslog */
  58 static char *pidfilename = NULL;                        /* pid file location */
  59 static char *confdir = NULL;
  60 static char controlcookie[1024];
  61 char *netname = NULL;
  62 char *confbase = NULL;
  63 static char *tinc_conf = NULL;
  64 static char *hosts_dir = NULL;
  65
  66 // Horrible global variables...
  67 static int pid = 0;
  68 static int fd = -1;
  69 static char line[4096];
  70 static int code;
  71 static int req;
  72 static int result;
  73 static bool force = false;
  74 static bool tty = true;
  75
  76 #ifdef HAVE_MINGW
  77 static struct WSAData wsa_state;
  78 #endif
  79
  80 static struct option const long_options[] = {
  81         {"config", required_argument, NULL, 'c'},
  82         {"debug", optional_argument, NULL, 0},
  83         {"no-detach", no_argument, NULL, 0},
  84         {"mlock", no_argument, NULL, 0},
  85         {"net", required_argument, NULL, 'n'},
  86         {"help", no_argument, NULL, 1},
  87         {"version", no_argument, NULL, 2},
  88         {"pidfile", required_argument, NULL, 5},
  89         {"logfile", required_argument, NULL, 0},
  90         {"bypass-security", no_argument, NULL, 0},
  91         {"chroot", no_argument, NULL, 0},
  92         {"user", required_argument, NULL, 0},
  93         {"option", required_argument, NULL, 0},
  94         {"force", no_argument, NULL, 6},
  95         {NULL, 0, NULL, 0}
  96 };
  97
  98 static void version(void) {
  99         printf("%s version %s (built %s %s, protocol %d.%d)\n", PACKAGE,
 100                    VERSION, __DATE__, __TIME__, PROT_MAJOR, PROT_MINOR);
 101         printf("Copyright (C) 1998-2012 Ivo Timmermans, Guus Sliepen and others.\n"
 102                         "See the AUTHORS file for a complete list.\n\n"
 103                         "tinc comes with ABSOLUTELY NO WARRANTY.  This is free software,\n"
 104                         "and you are welcome to redistribute it under certain conditions;\n"
 105                         "see the file COPYING for details.\n");
 106 }
 107
 108 static void usage(bool status) {
 109         if(status)
 110                 fprintf(stderr, "Try `%s --help\' for more information.\n",
 111                                 program_name);
 112         else {
 113                 printf("Usage: %s [options] command\n\n", program_name);
 114                 printf("Valid options are:\n"
 115                                 "  -c, --config=DIR        Read configuration options from DIR.\n"
 116                                 "  -n, --net=NETNAME       Connect to net NETNAME.\n"
 117                                 "      --pidfile=FILENAME  Read control cookie from FILENAME.\n"
 118                                 "      --help              Display this help and exit.\n"
 119                                 "      --version           Output version information and exit.\n"
 120                                 "\n"
 121                                 "Valid commands are:\n"
 122                                 "  init [name]                Create initial configuration files.\n"
 123                                 "  config                     Change configuration:\n"
 124                                 "    [get] VARIABLE           - print current value of VARIABLE\n"
 125                                 "    [set] VARIABLE VALUE     - set VARIABLE to VALUE\n"
 126                                 "    add VARIABLE VALUE       - add VARIABLE with the given VALUE\n"
 127                                 "    del VARIABLE [VALUE]     - remove VARIABLE [only ones with watching VALUE]\n"
 128                                 "  start [tincd options]      Start tincd.\n"
 129                                 "  stop                       Stop tincd.\n"
 130                                 "  restart                    Restart tincd.\n"
 131                                 "  reload                     Partially reload configuration of running tincd.\n"
 132                                 "  pid                        Show PID of currently running tincd.\n"
 133                                 "  generate-keys [bits]       Generate new RSA and ECDSA public/private keypairs.\n"
 134                                 "  generate-rsa-keys [bits]   Generate a new RSA public/private keypair.\n"
 135                                 "  generate-ecdsa-keys        Generate a new ECDSA public/private keypair.\n"
 136                                 "  dump                       Dump a list of one of the following things:\n"
 137                                 "    nodes                    - all known nodes in the VPN\n"
 138                                 "    edges                    - all known connections in the VPN\n"
 139                                 "    subnets                  - all known subnets in the VPN\n"
 140                                 "    connections              - all meta connections with ourself\n"
 141                                 "    graph                    - graph of the VPN in dotty format\n"
 142                                 "  info NODE|SUBNET|ADDRESS   Give information about a particular NODE, SUBNET or ADDRESS.\n"
 143                                 "  purge                      Purge unreachable nodes\n"
 144                                 "  debug N                    Set debug level\n"
 145                                 "  retry                      Retry all outgoing connections\n"
 146                                 "  disconnect NODE            Close meta connection with NODE\n"
 147 #ifdef HAVE_CURSES
 148                                 "  top                        Show real-time statistics\n"
 149 #endif
 150                                 "  pcap [snaplen]             Dump traffic in pcap format [up to snaplen bytes per packet]\n"
 151                                 "  log [level]                Dump log output [up to the specified level]\n"
 152                                 "  export                     Export host configuration of local node to standard output\n"
 153                                 "  export-all                 Export all host configuration files to standard output\n"
 154                                 "  import [--force]           Import host configuration file(s) from standard input\n"
 155                                 "\n");
 156                 printf("Report bugs to tinc@tinc-vpn.org.\n");
 157         }
 158 }
 159
 160 static bool parse_options(int argc, char **argv) {
 161         int r;
 162         int option_index = 0;
 163
 164         while((r = getopt_long(argc, argv, "c:n:Dd::Lo:RU:", long_options, &option_index)) != EOF) {
 165                 switch (r) {
 166                         case 0:                         /* long option */
 167                                 break;
 168
 169                         case 'c':                               /* config file */
 170                                 confbase = xstrdup(optarg);
 171                                 break;
 172
 173                         case 'n':                               /* net name given */
 174                                 netname = xstrdup(optarg);
 175                                 break;
 176
 177                         case 1:                                 /* show help */
 178                                 show_help = true;
 179                                 break;
 180
 181                         case 2:                                 /* show version */
 182                                 show_version = true;
 183                                 break;
 184
 185                         case 5:                                 /* open control socket here */
 186                                 pidfilename = xstrdup(optarg);
 187                                 break;
 188
 189                         case 6:
 190                                 force = true;
 191                                 break;
 192
 193                         case '?':
 194                                 usage(true);
 195                                 return false;
 196
 197                         default:
 198                                 break;
 199                 }
 200         }
 201
 202         if(!netname && (netname = getenv("NETNAME")))
 203                 netname = xstrdup(netname);
 204
 205         /* netname "." is special: a "top-level name" */
 206
 207         if(netname && (!*netname || !strcmp(netname, "."))) {
 208                 free(netname);
 209                 netname = NULL;
 210         }
 211
 212         if(netname && (strpbrk(netname, "\\/") || *netname == '.')) {
 213                 fprintf(stderr, "Invalid character in netname!\n");
 214                 return false;
 215         }
 216
 217         return true;
 218 }
 219
 220 static FILE *ask_and_open(const char *filename, const char *what, const char *mode, bool ask) {
 221         FILE *r;
 222         char *directory;
 223         char buf[PATH_MAX];
 224         char buf2[PATH_MAX];
 225
 226         /* Check stdin and stdout */
 227         if(ask && tty) {
 228                 /* Ask for a file and/or directory name. */
 229                 fprintf(stdout, "Please enter a file to save %s to [%s]: ",
 230                                 what, filename);
 231                 fflush(stdout);
 232
 233                 if(fgets(buf, sizeof buf, stdin) == NULL) {
 234                         fprintf(stderr, "Error while reading stdin: %s\n",
 235                                         strerror(errno));
 236                         return NULL;
 237                 }
 238
 239                 size_t len = strlen(buf);
 240                 if(len)
 241                         buf[--len] = 0;
 242
 243                 if(len)
 244                         filename = buf;
 245         }
 246
 247 #ifdef HAVE_MINGW
 248         if(filename[0] != '\\' && filename[0] != '/' && !strchr(filename, ':')) {
 249 #else
 250         if(filename[0] != '/') {
 251 #endif
 252                 /* The directory is a relative path or a filename. */
 253                 directory = get_current_dir_name();
 254                 snprintf(buf2, sizeof buf2, "%s" SLASH "%s", directory, filename);
 255                 filename = buf2;
 256         }
 257
 258         umask(0077);                            /* Disallow everything for group and other */
 259
 260         /* Open it first to keep the inode busy */
 261
 262         r = fopen(filename, mode);
 263
 264         if(!r) {
 265                 fprintf(stderr, "Error opening file `%s': %s\n", filename, strerror(errno));
 266                 return NULL;
 267         }
 268
 269         return r;
 270 }
 271
 272 /*
 273   Generate a public/private ECDSA keypair, and ask for a file to store
 274   them in.
 275 */
 276 static bool ecdsa_keygen(bool ask) {
 277         ecdsa_t key;
 278         FILE *f;
 279         char *filename;
 280
 281         fprintf(stderr, "Generating ECDSA keypair:\n");
 282
 283         if(!ecdsa_generate(&key)) {
 284                 fprintf(stderr, "Error during key generation!\n");
 285                 return false;
 286         } else
 287                 fprintf(stderr, "Done.\n");
 288
 289         xasprintf(&filename, "%s" SLASH "ecdsa_key.priv", confbase);
 290         f = ask_and_open(filename, "private ECDSA key", "a", ask);
 291
 292         if(!f)
 293                 return false;
 294
 295 #ifdef HAVE_FCHMOD
 296         /* Make it unreadable for others. */
 297         fchmod(fileno(f), 0600);
 298 #endif
 299
 300         if(ftell(f))
 301                 fprintf(stderr, "Appending key to existing contents.\nMake sure only one key is stored in the file.\n");
 302
 303         ecdsa_write_pem_private_key(&key, f);
 304
 305         fclose(f);
 306         free(filename);
 307
 308         if(name)
 309                 xasprintf(&filename, "%s" SLASH "hosts" SLASH "%s", confbase, name);
 310         else
 311                 xasprintf(&filename, "%s" SLASH "ecdsa_key.pub", confbase);
 312
 313         f = ask_and_open(filename, "public ECDSA key", "a", ask);
 314
 315         if(!f)
 316                 return false;
 317
 318         if(ftell(f))
 319                 fprintf(stderr, "Appending key to existing contents.\nMake sure only one key is stored in the file.\n");
 320
 321         char *pubkey = ecdsa_get_base64_public_key(&key);
 322         fprintf(f, "ECDSAPublicKey = %s\n", pubkey);
 323         free(pubkey);
 324
 325         fclose(f);
 326         free(filename);
 327
 328         return true;
 329 }
 330
 331 /*
 332   Generate a public/private RSA keypair, and ask for a file to store
 333   them in.
 334 */
 335 static bool rsa_keygen(int bits, bool ask) {
 336         rsa_t key;
 337         FILE *f;
 338         char *filename;
 339
 340         fprintf(stderr, "Generating %d bits keys:\n", bits);
 341
 342         if(!rsa_generate(&key, bits, 0x10001)) {
 343                 fprintf(stderr, "Error during key generation!\n");
 344                 return false;
 345         } else
 346                 fprintf(stderr, "Done.\n");
 347
 348         xasprintf(&filename, "%s" SLASH "rsa_key.priv", confbase);
 349         f = ask_and_open(filename, "private RSA key", "a", ask);
 350
 351         if(!f)
 352                 return false;
 353
 354 #ifdef HAVE_FCHMOD
 355         /* Make it unreadable for others. */
 356         fchmod(fileno(f), 0600);
 357 #endif
 358
 359         if(ftell(f))
 360                 fprintf(stderr, "Appending key to existing contents.\nMake sure only one key is stored in the file.\n");
 361
 362         rsa_write_pem_private_key(&key, f);
 363
 364         fclose(f);
 365         free(filename);
 366
 367         if(name)
 368                 xasprintf(&filename, "%s" SLASH "hosts" SLASH "%s", confbase, name);
 369         else
 370                 xasprintf(&filename, "%s" SLASH "rsa_key.pub", confbase);
 371
 372         f = ask_and_open(filename, "public RSA key", "a", ask);
 373
 374         if(!f)
 375                 return false;
 376
 377         if(ftell(f))
 378                 fprintf(stderr, "Appending key to existing contents.\nMake sure only one key is stored in the file.\n");
 379
 380         rsa_write_pem_public_key(&key, f);
 381
 382         fclose(f);
 383         free(filename);
 384
 385         return true;
 386 }
 387
 388 /*
 389   Set all files and paths according to netname
 390 */
 391 static void make_names(void) {
 392 #ifdef HAVE_MINGW
 393         HKEY key;
 394         char installdir[1024] = "";
 395         long len = sizeof installdir;
 396 #endif
 397
 398         if(netname)
 399                 xasprintf(&identname, "tinc.%s", netname);
 400         else
 401                 identname = xstrdup("tinc");
 402
 403 #ifdef HAVE_MINGW
 404         if(!RegOpenKeyEx(HKEY_LOCAL_MACHINE, "SOFTWARE\\tinc", 0, KEY_READ, &key)) {
 405                 if(!RegQueryValueEx(key, NULL, 0, 0, installdir, &len)) {
 406                         if(!confbase) {
 407                                 if(netname)
 408                                         xasprintf(&confbase, "%s" SLASH "%s", installdir, netname);
 409                                 else
 410                                         xasprintf(&confbase, "%s", installdir);
 411                         }
 412                 }
 413                 if(!pidfilename)
 414                         xasprintf(&pidfilename, "%s" SLASH "pid", confbase);
 415                 RegCloseKey(key);
 416         }
 417
 418         if(!*installdir) {
 419 #endif
 420         confdir = xstrdup(CONFDIR);
 421
 422         if(!pidfilename)
 423                 xasprintf(&pidfilename, "%s" SLASH "run" SLASH "%s.pid", LOCALSTATEDIR, identname);
 424
 425         if(netname) {
 426                 if(!confbase)
 427                         xasprintf(&confbase, CONFDIR SLASH "tinc" SLASH "%s", netname);
 428                 else
 429                         fprintf(stderr, "Both netname and configuration directory given, using the latter...\n");
 430         } else {
 431                 if(!confbase)
 432                         xasprintf(&confbase, CONFDIR SLASH "tinc");
 433         }
 434
 435 #ifdef HAVE_MINGW
 436         } else
 437                 confdir = xstrdup(installdir);
 438 #endif
 439
 440         xasprintf(&tinc_conf, "%s" SLASH "tinc.conf", confbase);
 441         xasprintf(&hosts_dir, "%s" SLASH "hosts", confbase);
 442 }
 443
 444 static char buffer[4096];
 445 static size_t blen = 0;
 446
 447 bool recvline(int fd, char *line, size_t len) {
 448         char *newline = NULL;
 449
 450         while(!(newline = memchr(buffer, '\n', blen))) {
 451                 int result = recv(fd, buffer + blen, sizeof buffer - blen, 0);
 452                 if(result == -1 && errno == EINTR)
 453                         continue;
 454                 else if(result <= 0)
 455                         return false;
 456                 blen += result;
 457         }
 458
 459         if(newline - buffer >= len)
 460                 return false;
 461
 462         len = newline - buffer;
 463
 464         memcpy(line, buffer, len);
 465         line[len] = 0;
 466         memmove(buffer, newline + 1, blen - len - 1);
 467         blen -= len + 1;
 468
 469         return true;
 470 }
 471
 472 static bool recvdata(int fd, char *data, size_t len) {
 473         while(blen < len) {
 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         memcpy(data, buffer, len);
 483         memmove(buffer, buffer + len, blen - len);
 484         blen -= len;
 485
 486         return true;
 487 }
 488
 489 bool sendline(int fd, char *format, ...) {
 490         static char buffer[4096];
 491         char *p = buffer;
 492         int blen = 0;
 493         va_list ap;
 494
 495         va_start(ap, format);
 496         blen = vsnprintf(buffer, sizeof buffer, format, ap);
 497         va_end(ap);
 498
 499         if(blen < 1 || blen >= sizeof buffer)
 500                 return false;
 501
 502         buffer[blen] = '\n';
 503         blen++;
 504
 505         while(blen) {
 506                 int result = send(fd, p, blen, 0);
 507                 if(result == -1 && errno == EINTR)
 508                         continue;
 509                 else if(result <= 0)
 510                         return false;
 511                 p += result;
 512                 blen -= result;
 513         }
 514
 515         return true;
 516 }
 517
 518 static void pcap(int fd, FILE *out, int snaplen) {
 519         sendline(fd, "%d %d %d", CONTROL, REQ_PCAP, snaplen);
 520         char data[9018];
 521
 522         struct {
 523                 uint32_t magic;
 524                 uint16_t major;
 525                 uint16_t minor;
 526                 uint32_t tz_offset;
 527                 uint32_t tz_accuracy;
 528                 uint32_t snaplen;
 529                 uint32_t ll_type;
 530         } header = {
 531                 0xa1b2c3d4,
 532                 2, 4,
 533                 0, 0,
 534                 snaplen ?: sizeof data,
 535                 1,
 536         };
 537
 538         struct {
 539                 uint32_t tv_sec;
 540                 uint32_t tv_usec;
 541                 uint32_t len;
 542                 uint32_t origlen;
 543         } packet;
 544
 545         struct timeval tv;
 546
 547         fwrite(&header, sizeof header, 1, out);
 548         fflush(out);
 549
 550         char line[32];
 551         while(recvline(fd, line, sizeof line)) {
 552                 int code, req, len;
 553                 int n = sscanf(line, "%d %d %d", &code, &req, &len);
 554                 gettimeofday(&tv, NULL);
 555                 if(n != 3 || code != CONTROL || req != REQ_PCAP || len < 0 || len > sizeof data)
 556                         break;
 557                 if(!recvdata(fd, data, len))
 558                         break;
 559                 packet.tv_sec = tv.tv_sec;
 560                 packet.tv_usec = tv.tv_usec;
 561                 packet.len = len;
 562                 packet.origlen = len;
 563                 fwrite(&packet, sizeof packet, 1, out);
 564                 fwrite(data, len, 1, out);
 565                 fflush(out);
 566         }
 567 }
 568
 569 static void logcontrol(int fd, FILE *out, int level) {
 570         sendline(fd, "%d %d %d", CONTROL, REQ_LOG, level);
 571         char data[1024];
 572         char line[32];
 573
 574         while(recvline(fd, line, sizeof line)) {
 575                 int code, req, len;
 576                 int n = sscanf(line, "%d %d %d", &code, &req, &len);
 577                 if(n != 3 || code != CONTROL || req != REQ_LOG || len < 0 || len > sizeof data)
 578                         break;
 579                 if(!recvdata(fd, data, len))
 580                         break;
 581                 fwrite(data, len, 1, out);
 582                 fputc('\n', out);
 583                 fflush(out);
 584         }
 585 }
 586
 587 #ifdef HAVE_MINGW
 588 static bool remove_service(void) {
 589         SC_HANDLE manager = NULL;
 590         SC_HANDLE service = NULL;
 591         SERVICE_STATUS status = {0};
 592
 593         manager = OpenSCManager(NULL, NULL, SC_MANAGER_ALL_ACCESS);
 594         if(!manager) {
 595                 fprintf(stderr, "Could not open service manager: %s\n", winerror(GetLastError()));
 596                 return false;
 597         }
 598
 599         service = OpenService(manager, identname, SERVICE_ALL_ACCESS);
 600
 601         if(!service) {
 602                 fprintf(stderr, "Could not open %s service: %s\n", identname, winerror(GetLastError()));
 603                 return false;
 604         }
 605
 606         if(!ControlService(service, SERVICE_CONTROL_STOP, &status))
 607                 fprintf(stderr, "Could not stop %s service: %s\n", identname, winerror(GetLastError()));
 608         else
 609                 fprintf(stderr, "%s service stopped\n", identname);
 610
 611         if(!DeleteService(service)) {
 612                 fprintf(stderr, "Could not remove %s service: %s\n", identname, winerror(GetLastError()));
 613                 return false;
 614         }
 615
 616         fprintf(stderr, "%s service removed\n", identname);
 617
 618         return true;
 619 }
 620 #endif
 621
 622 static bool connect_tincd(bool verbose) {
 623         if(fd >= 0)
 624                 return true;
 625
 626         FILE *f = fopen(pidfilename, "r");
 627         if(!f) {
 628                 if(verbose)
 629                         fprintf(stderr, "Could not open pid file %s: %s\n", pidfilename, strerror(errno));
 630                 return false;
 631         }
 632
 633         char host[128];
 634         char port[128];
 635
 636         if(fscanf(f, "%20d %1024s %128s port %128s", &pid, controlcookie, host, port) != 4) {
 637                 if(verbose)
 638                         fprintf(stderr, "Could not parse pid file %s\n", pidfilename);
 639                 fclose(f);
 640                 return false;
 641         }
 642
 643         fclose(f);
 644
 645 #ifdef HAVE_MINGW
 646         if(WSAStartup(MAKEWORD(2, 2), &wsa_state)) {
 647                 if(verbose)
 648                         fprintf(stderr, "System call `%s' failed: %s", "WSAStartup", winerror(GetLastError()));
 649                 return false;
 650         }
 651 #endif
 652
 653         struct addrinfo hints = {
 654                 .ai_family = AF_UNSPEC,
 655                 .ai_socktype = SOCK_STREAM,
 656                 .ai_protocol = IPPROTO_TCP,
 657                 .ai_flags = 0,
 658         };
 659
 660         struct addrinfo *res = NULL;
 661
 662         if(getaddrinfo(host, port, &hints, &res) || !res) {
 663                 if(verbose)
 664                         fprintf(stderr, "Cannot resolve %s port %s: %s", host, port, strerror(errno));
 665                 return false;
 666         }
 667
 668         fd = socket(res->ai_family, SOCK_STREAM, IPPROTO_TCP);
 669         if(fd < 0) {
 670                 if(verbose)
 671                         fprintf(stderr, "Cannot create TCP socket: %s\n", sockstrerror(sockerrno));
 672                 return false;
 673         }
 674
 675 #ifdef HAVE_MINGW
 676         unsigned long arg = 0;
 677
 678         if(ioctlsocket(fd, FIONBIO, &arg) != 0) {
 679                 if(verbose)
 680                         fprintf(stderr, "ioctlsocket failed: %s", sockstrerror(sockerrno));
 681         }
 682 #endif
 683
 684         if(connect(fd, res->ai_addr, res->ai_addrlen) < 0) {
 685                 if(verbose)
 686                         fprintf(stderr, "Cannot connect to %s port %s: %s\n", host, port, sockstrerror(sockerrno));
 687                 return false;
 688         }
 689
 690         freeaddrinfo(res);
 691
 692         char data[4096];
 693         int version;
 694
 695         if(!recvline(fd, line, sizeof line) || sscanf(line, "%d %s %d", &code, data, &version) != 3 || code != 0) {
 696                 if(verbose)
 697                         fprintf(stderr, "Cannot read greeting from control socket: %s\n", sockstrerror(sockerrno));
 698                 return false;
 699         }
 700
 701         sendline(fd, "%d ^%s %d", ID, controlcookie, TINC_CTL_VERSION_CURRENT);
 702
 703         if(!recvline(fd, line, sizeof line) || sscanf(line, "%d %d %d", &code, &version, &pid) != 3 || code != 4 || version != TINC_CTL_VERSION_CURRENT) {
 704                 if(verbose)
 705                         fprintf(stderr, "Could not fully establish control socket connection\n");
 706                 return false;
 707         }
 708
 709         return true;
 710 }
 711
 712
 713 static int cmd_start(int argc, char *argv[]) {
 714         if(connect_tincd(false)) {
 715                 if(netname)
 716                         fprintf(stderr, "A tincd is already running for net `%s' with pid %d.\n", netname, pid);
 717                 else
 718                         fprintf(stderr, "A tincd is already running with pid %d.\n", pid);
 719                 return 0;
 720         }
 721
 722         char *c;
 723         char *slash = strrchr(program_name, '/');
 724
 725 #ifdef HAVE_MINGW
 726         if ((c = strrchr(program_name, '\\')) > slash)
 727                 slash = c;
 728 #endif
 729
 730         if (slash++)
 731                 xasprintf(&c, "%.*stincd", (int)(slash - program_name), program_name);
 732         else
 733                 c = "tincd";
 734
 735         int nargc = 0;
 736         char **nargv = xmalloc_and_zero((orig_argc + argc) * sizeof *nargv);
 737
 738         for(int i = 0; i < orig_argc; i++)
 739                 nargv[nargc++] = orig_argv[i];
 740         for(int i = 1; i < argc; i++)
 741                 nargv[nargc++] = argv[i];
 742
 743 #ifdef HAVE_MINGW
 744         execvp(c, nargv);
 745         fprintf(stderr, "Error starting %s: %s\n", c, strerror(errno));
 746         return 1;
 747 #else
 748         pid_t pid = fork();
 749         if(pid == -1) {
 750                 fprintf(stderr, "Could not fork: %s\n", strerror(errno));
 751                 return 1;
 752         }
 753
 754         if(!pid)
 755                 exit(execvp(c, nargv));
 756
 757         int status = -1;
 758         if(waitpid(pid, &status, 0) != pid || !WIFEXITED(status) || WEXITSTATUS(status)) {
 759                 fprintf(stderr, "Error starting %s\n", c);
 760                 return 1;
 761         }
 762
 763         return 0;
 764 #endif
 765 }
 766
 767 static int cmd_stop(int argc, char *argv[]) {
 768 #ifndef HAVE_MINGW
 769         if(!connect_tincd(true)) {
 770                 if(pid) {
 771                         if(kill(pid, SIGTERM))
 772                                 return 1;
 773                         fprintf(stderr, "Sent TERM signal to process with PID %u.\n", pid);
 774                         return 0;
 775                 }
 776
 777                 return 1;
 778         }
 779
 780         sendline(fd, "%d %d", CONTROL, REQ_STOP);
 781         if(!recvline(fd, line, sizeof line) || sscanf(line, "%d %d %d", &code, &req, &result) != 3 || code != CONTROL || req != REQ_STOP || result) {
 782                 fprintf(stderr, "Could not stop tinc daemon.\n");
 783                 return 1;
 784         }
 785 #else
 786         if(!remove_service())
 787                 return 1;
 788 #endif
 789         close(fd);
 790         pid = 0;
 791         fd = -1;
 792
 793         return 0;
 794 }
 795
 796 static int cmd_restart(int argc, char *argv[]) {
 797         cmd_stop(argc, argv);
 798         return cmd_start(argc, argv);
 799 }
 800
 801 static int cmd_reload(int argc, char *argv[]) {
 802         if(!connect_tincd(true))
 803                 return 1;
 804
 805         sendline(fd, "%d %d", CONTROL, REQ_RELOAD);
 806         if(!recvline(fd, line, sizeof line) || sscanf(line, "%d %d %d", &code, &req, &result) != 3 || code != CONTROL || req != REQ_RELOAD || result) {
 807                 fprintf(stderr, "Could not reload configuration.\n");
 808                 return 1;
 809         }
 810
 811         return 0;
 812
 813 }
 814
 815 static int cmd_dump(int argc, char *argv[]) {
 816         if(argc != 2) {
 817                 fprintf(stderr, "Invalid number of arguments.\n");
 818                 usage(true);
 819                 return 1;
 820         }
 821
 822         if(!connect_tincd(true))
 823                 return 1;
 824
 825         bool do_graph = false;
 826
 827         if(!strcasecmp(argv[1], "nodes"))
 828                 sendline(fd, "%d %d", CONTROL, REQ_DUMP_NODES);
 829         else if(!strcasecmp(argv[1], "edges"))
 830                 sendline(fd, "%d %d", CONTROL, REQ_DUMP_EDGES);
 831         else if(!strcasecmp(argv[1], "subnets"))
 832                 sendline(fd, "%d %d", CONTROL, REQ_DUMP_SUBNETS);
 833         else if(!strcasecmp(argv[1], "connections"))
 834                 sendline(fd, "%d %d", CONTROL, REQ_DUMP_CONNECTIONS);
 835         else if(!strcasecmp(argv[1], "graph")) {
 836                 sendline(fd, "%d %d", CONTROL, REQ_DUMP_NODES);
 837                 sendline(fd, "%d %d", CONTROL, REQ_DUMP_EDGES);
 838                 do_graph = true;
 839         } else {
 840                 fprintf(stderr, "Unknown dump type '%s'.\n", argv[1]);
 841                 usage(true);
 842                 return 1;
 843         }
 844
 845         if(do_graph)
 846                 printf("digraph {\n");
 847
 848         while(recvline(fd, line, sizeof line)) {
 849                 char node1[4096], node2[4096];
 850                 int n = sscanf(line, "%d %d %s %s", &code, &req, node1, node2);
 851                 if(n == 2) {
 852                         if(do_graph && req == REQ_DUMP_NODES)
 853                                 continue;
 854                         else {
 855                                 if(do_graph)
 856                                         printf("}\n");
 857                                 return 0;
 858                         }
 859                 }
 860                 if(n < 2)
 861                         break;
 862
 863                 if(!do_graph) {
 864                         char node[4096];
 865                         char from[4096];
 866                         char to[4096];
 867                         char subnet[4096];
 868                         char host[4096];
 869                         char port[4096];
 870                         char via[4096];
 871                         char nexthop[4096];
 872                         int cipher, digest, maclength, compression, distance, socket, weight;
 873                         short int pmtu, minmtu, maxmtu;
 874                         unsigned int options, status;
 875                         long int last_state_change;
 876
 877                         switch(req) {
 878                                 case REQ_DUMP_NODES: {
 879                                         int n = sscanf(line, "%*d %*d %s %s port %s %d %d %d %d %x %x %s %s %d %hd %hd %hd %ld", node, host, port, &cipher, &digest, &maclength, &compression, &options, &status, nexthop, via, &distance, &pmtu, &minmtu, &maxmtu, &last_state_change);
 880                                         if(n != 16) {
 881                                                 fprintf(stderr, "Unable to parse node dump from tincd: %s\n", line);
 882                                                 return 1;
 883                                         }
 884                                         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",
 885                                                         node, host, port, cipher, digest, maclength, compression, options, status, nexthop, via, distance, pmtu, minmtu, maxmtu);
 886                                 } break;
 887
 888                                 case REQ_DUMP_EDGES: {
 889                                         int n = sscanf(line, "%*d %*d %s %s %s port %s %x %d", from, to, host, port, &options, &weight);
 890                                         if(n != 6) {
 891                                                 fprintf(stderr, "Unable to parse edge dump from tincd.\n");
 892                                                 return 1;
 893                                         }
 894                                         printf("%s to %s at %s port %s options %x weight %d\n", from, to, host, port, options, weight);
 895                                 } break;
 896
 897                                 case REQ_DUMP_SUBNETS: {
 898                                         int n = sscanf(line, "%*d %*d %s %s", subnet, node);
 899                                         if(n != 2) {
 900                                                 fprintf(stderr, "Unable to parse subnet dump from tincd.\n");
 901                                                 return 1;
 902                                         }
 903                                         printf("%s owner %s\n", strip_weight(subnet), node);
 904                                 } break;
 905
 906                                 case REQ_DUMP_CONNECTIONS: {
 907                                         int n = sscanf(line, "%*d %*d %s %s port %s %x %d %x", node, host, port, &options, &socket, &status);
 908                                         if(n != 6) {
 909                                                 fprintf(stderr, "Unable to parse connection dump from tincd.\n");
 910                                                 return 1;
 911                                         }
 912                                         printf("%s at %s port %s options %x socket %d status %x\n", node, host, port, options, socket, status);
 913                                 } break;
 914
 915                                 default:
 916                                         fprintf(stderr, "Unable to parse dump from tincd.\n");
 917                                         return 1;
 918                         }
 919                 } else {
 920                         if(req == REQ_DUMP_NODES)
 921                                 printf(" %s [label = \"%s\"];\n", node1, node1);
 922                         else
 923                                 printf(" %s -> %s;\n", node1, node2);
 924                 }
 925         }
 926
 927         fprintf(stderr, "Error receiving dump.\n");
 928         return 1;
 929 }
 930
 931 static int cmd_purge(int argc, char *argv[]) {
 932         if(!connect_tincd(true))
 933                 return 1;
 934
 935         sendline(fd, "%d %d", CONTROL, REQ_PURGE);
 936         if(!recvline(fd, line, sizeof line) || sscanf(line, "%d %d %d", &code, &req, &result) != 3 || code != CONTROL || req != REQ_PURGE || result) {
 937                 fprintf(stderr, "Could not purge old information.\n");
 938                 return 1;
 939         }
 940
 941         return 0;
 942 }
 943
 944 static int cmd_debug(int argc, char *argv[]) {
 945         if(argc != 2) {
 946                 fprintf(stderr, "Invalid number of arguments.\n");
 947                 return 1;
 948         }
 949
 950         if(!connect_tincd(true))
 951                 return 1;
 952
 953         int debuglevel = atoi(argv[1]);
 954         int origlevel;
 955
 956         sendline(fd, "%d %d %d", CONTROL, REQ_SET_DEBUG, debuglevel);
 957         if(!recvline(fd, line, sizeof line) || sscanf(line, "%d %d %d", &code, &req, &origlevel) != 3 || code != CONTROL || req != REQ_SET_DEBUG) {
 958                 fprintf(stderr, "Could not set debug level.\n");
 959                 return 1;
 960         }
 961
 962         fprintf(stderr, "Old level %d, new level %d.\n", origlevel, debuglevel);
 963         return 0;
 964 }
 965
 966 static int cmd_retry(int argc, char *argv[]) {
 967         if(!connect_tincd(true))
 968                 return 1;
 969
 970         sendline(fd, "%d %d", CONTROL, REQ_RETRY);
 971         if(!recvline(fd, line, sizeof line) || sscanf(line, "%d %d %d", &code, &req, &result) != 3 || code != CONTROL || req != REQ_RETRY || result) {
 972                 fprintf(stderr, "Could not retry outgoing connections.\n");
 973                 return 1;
 974         }
 975
 976         return 0;
 977 }
 978
 979 static int cmd_connect(int argc, char *argv[]) {
 980         if(argc != 2) {
 981                 fprintf(stderr, "Invalid number of arguments.\n");
 982                 return 1;
 983         }
 984
 985         if(!check_id(argv[1])) {
 986                 fprintf(stderr, "Invalid name for node.\n");
 987                 return 1;
 988         }
 989
 990         if(!connect_tincd(true))
 991                 return 1;
 992
 993         sendline(fd, "%d %d %s", CONTROL, REQ_CONNECT, argv[1]);
 994         if(!recvline(fd, line, sizeof line) || sscanf(line, "%d %d %d", &code, &req, &result) != 3 || code != CONTROL || req != REQ_CONNECT || result) {
 995                 fprintf(stderr, "Could not connect to %s.\n", argv[1]);
 996                 return 1;
 997         }
 998
 999         return 0;
1000 }
1001
1002 static int cmd_disconnect(int argc, char *argv[]) {
1003         if(argc != 2) {
1004                 fprintf(stderr, "Invalid number of arguments.\n");
1005                 return 1;
1006         }
1007
1008         if(!check_id(argv[1])) {
1009                 fprintf(stderr, "Invalid name for node.\n");
1010                 return 1;
1011         }
1012
1013         if(!connect_tincd(true))
1014                 return 1;
1015
1016         sendline(fd, "%d %d %s", CONTROL, REQ_DISCONNECT, argv[1]);
1017         if(!recvline(fd, line, sizeof line) || sscanf(line, "%d %d %d", &code, &req, &result) != 3 || code != CONTROL || req != REQ_DISCONNECT || result) {
1018                 fprintf(stderr, "Could not disconnect %s.\n", argv[1]);
1019                 return 1;
1020         }
1021
1022         return 0;
1023 }
1024
1025 static int cmd_top(int argc, char *argv[]) {
1026 #ifdef HAVE_CURSES
1027         if(!connect_tincd(true))
1028                 return 1;
1029
1030         top(fd);
1031         return 0;
1032 #else
1033         fprintf(stderr, "This version of tincctl was compiled without support for the curses library.\n");
1034         return 1;
1035 #endif
1036 }
1037
1038 static int cmd_pcap(int argc, char *argv[]) {
1039         if(!connect_tincd(true))
1040                 return 1;
1041
1042         pcap(fd, stdout, argc > 1 ? atoi(argv[1]) : 0);
1043         return 0;
1044 }
1045
1046 static int cmd_log(int argc, char *argv[]) {
1047         if(!connect_tincd(true))
1048                 return 1;
1049
1050         logcontrol(fd, stdout, argc > 1 ? atoi(argv[1]) : -1);
1051         return 0;
1052 }
1053
1054 static int cmd_pid(int argc, char *argv[]) {
1055         if(!connect_tincd(true) && !pid)
1056                 return 1;
1057
1058         printf("%d\n", pid);
1059         return 0;
1060 }
1061
1062 static int rstrip(char *value) {
1063         int len = strlen(value);
1064         while(len && strchr("\t\r\n ", value[len - 1]))
1065                 value[--len] = 0;
1066         return len;
1067 }
1068
1069 static char *get_my_name() {
1070         FILE *f = fopen(tinc_conf, "r");
1071         if(!f) {
1072                 fprintf(stderr, "Could not open %s: %s\n", tinc_conf, strerror(errno));
1073                 return NULL;
1074         }
1075
1076         char buf[4096];
1077         char *value;
1078         while(fgets(buf, sizeof buf, f)) {
1079                 int len = strcspn(buf, "\t =");
1080                 value = buf + len;
1081                 value += strspn(value, "\t ");
1082                 if(*value == '=') {
1083                         value++;
1084                         value += strspn(value, "\t ");
1085                 }
1086                 if(!rstrip(value))
1087                         continue;
1088                 buf[len] = 0;
1089                 if(strcasecmp(buf, "Name"))
1090                         continue;
1091                 if(*value) {
1092                         fclose(f);
1093                         return strdup(value);
1094                 }
1095         }
1096
1097         fclose(f);
1098         fprintf(stderr, "Could not find Name in %s.\n", tinc_conf);
1099         return NULL;
1100 }
1101
1102 #define VAR_SERVER 1    /* Should be in tinc.conf */
1103 #define VAR_HOST 2      /* Can be in host config file */
1104 #define VAR_MULTIPLE 4  /* Multiple statements allowed */
1105 #define VAR_OBSOLETE 8  /* Should not be used anymore */
1106
1107 static struct {
1108         const char *name;
1109         int type;
1110 } const variables[] = {
1111         /* Server configuration */
1112         {"AddressFamily", VAR_SERVER},
1113         {"BindToAddress", VAR_SERVER | VAR_MULTIPLE},
1114         {"BindToInterface", VAR_SERVER},
1115         {"Broadcast", VAR_SERVER},
1116         {"ConnectTo", VAR_SERVER | VAR_MULTIPLE},
1117         {"DecrementTTL", VAR_SERVER},
1118         {"Device", VAR_SERVER},
1119         {"DeviceType", VAR_SERVER},
1120         {"DirectOnly", VAR_SERVER},
1121         {"ECDSAPrivateKeyFile", VAR_SERVER},
1122         {"ExperimentalProtocol", VAR_SERVER},
1123         {"Forwarding", VAR_SERVER},
1124         {"GraphDumpFile", VAR_SERVER},
1125         {"Hostnames", VAR_SERVER},
1126         {"IffOneQueue", VAR_SERVER},
1127         {"Interface", VAR_SERVER},
1128         {"KeyExpire", VAR_SERVER},
1129         {"LocalDiscovery", VAR_SERVER},
1130         {"MACExpire", VAR_SERVER},
1131         {"MaxOutputBufferSize", VAR_SERVER},
1132         {"MaxTimeout", VAR_SERVER},
1133         {"Mode", VAR_SERVER},
1134         {"Name", VAR_SERVER},
1135         {"PingInterval", VAR_SERVER},
1136         {"PingTimeout", VAR_SERVER},
1137         {"PriorityInheritance", VAR_SERVER},
1138         {"PrivateKey", VAR_SERVER | VAR_OBSOLETE},
1139         {"PrivateKeyFile", VAR_SERVER},
1140         {"ProcessPriority", VAR_SERVER},
1141         {"Proxy", VAR_SERVER},
1142         {"ReplayWindow", VAR_SERVER},
1143         {"StrictSubnets", VAR_SERVER},
1144         {"TunnelServer", VAR_SERVER},
1145         {"UDPRcvBuf", VAR_SERVER},
1146         {"UDPSndBuf", VAR_SERVER},
1147         {"VDEGroup", VAR_SERVER},
1148         {"VDEPort", VAR_SERVER},
1149         /* Host configuration */
1150         {"Address", VAR_HOST | VAR_MULTIPLE},
1151         {"Cipher", VAR_SERVER | VAR_HOST},
1152         {"ClampMSS", VAR_SERVER | VAR_HOST},
1153         {"Compression", VAR_SERVER | VAR_HOST},
1154         {"Digest", VAR_SERVER | VAR_HOST},
1155         {"ECDSAPublicKey", VAR_HOST},
1156         {"ECDSAPublicKeyFile", VAR_SERVER | VAR_HOST},
1157         {"IndirectData", VAR_SERVER | VAR_HOST},
1158         {"MACLength", VAR_SERVER | VAR_HOST},
1159         {"PMTU", VAR_SERVER | VAR_HOST},
1160         {"PMTUDiscovery", VAR_SERVER | VAR_HOST},
1161         {"Port", VAR_HOST},
1162         {"PublicKey", VAR_HOST | VAR_OBSOLETE},
1163         {"PublicKeyFile", VAR_SERVER | VAR_HOST | VAR_OBSOLETE},
1164         {"Subnet", VAR_HOST | VAR_MULTIPLE},
1165         {"TCPOnly", VAR_SERVER | VAR_HOST},
1166         {"Weight", VAR_HOST},
1167         {NULL, 0}
1168 };
1169
1170 static int cmd_config(int argc, char *argv[]) {
1171         if(argc < 2) {
1172                 fprintf(stderr, "Invalid number of arguments.\n");
1173                 return 1;
1174         }
1175
1176         int action = -2;
1177         if(!strcasecmp(argv[1], "get")) {
1178                 argv++, argc--;
1179         } else if(!strcasecmp(argv[1], "add")) {
1180                 argv++, argc--, action = 1;
1181         } else if(!strcasecmp(argv[1], "del")) {
1182                 argv++, argc--, action = -1;
1183         } else if(!strcasecmp(argv[1], "replace") || !strcasecmp(argv[1], "set") || !strcasecmp(argv[1], "change")) {
1184                 argv++, argc--, action = 0;
1185         }
1186
1187         if(argc < 2) {
1188                 fprintf(stderr, "Invalid number of arguments.\n");
1189                 return 1;
1190         }
1191
1192         // Concatenate the rest of the command line
1193         strncpy(line, argv[1], sizeof line - 1);
1194         for(int i = 2; i < argc; i++) {
1195                 strncat(line, " ", sizeof line - 1 - strlen(line));
1196                 strncat(line, argv[i], sizeof line - 1 - strlen(line));
1197         }
1198
1199         // Liberal parsing into node name, variable name and value.
1200         char *node = NULL;
1201         char *variable;
1202         char *value;
1203         int len;
1204
1205         len = strcspn(line, "\t =");
1206         value = line + len;
1207         value += strspn(value, "\t ");
1208         if(*value == '=') {
1209                 value++;
1210                 value += strspn(value, "\t ");
1211         }
1212         line[len] = '\0';
1213         variable = strchr(line, '.');
1214         if(variable) {
1215                 node = line;
1216                 *variable++ = 0;
1217         } else {
1218                 variable = line;
1219         }
1220
1221         if(!*variable) {
1222                 fprintf(stderr, "No variable given.\n");
1223                 return 1;
1224         }
1225
1226         if(action >= 0 && !*value) {
1227                 fprintf(stderr, "No value for variable given.\n");
1228                 return 1;
1229         }
1230
1231         if(action < -1 && *value)
1232                 action = 0;
1233
1234         /* Some simple checks. */
1235         bool found = false;
1236
1237         for(int i = 0; variables[i].name; i++) {
1238                 if(strcasecmp(variables[i].name, variable))
1239                         continue;
1240
1241                 found = true;
1242                 variable = (char *)variables[i].name;
1243
1244                 /* Discourage use of obsolete variables. */
1245
1246                 if(variables[i].type & VAR_OBSOLETE && action >= 0) {
1247                         if(force) {
1248                                 fprintf(stderr, "Warning: %s is an obsolete variable!\n", variable);
1249                         } else {
1250                                 fprintf(stderr, "%s is an obsolete variable! Use --force to use it anyway.\n", variable);
1251                                 return 1;
1252                         }
1253                 }
1254
1255                 /* Don't put server variables in host config files */
1256
1257                 if(node && !(variables[i].type & VAR_HOST) && action >= 0) {
1258                         if(force) {
1259                                 fprintf(stderr, "Warning: %s is not a host configuration variable!\n", variable);
1260                         } else {
1261                                 fprintf(stderr, "%s is not a host configuration variable! Use --force to use it anyway.\n", variable);
1262                                 return 1;
1263                         }
1264                 }
1265
1266                 /* Should this go into our own host config file? */
1267
1268                 if(!node && !(variables[i].type & VAR_SERVER)) {
1269                         node = get_my_name();
1270                         if(!node)
1271                                 return 1;
1272                 }
1273
1274                 break;
1275         }
1276
1277         if(node && !check_id(node)) {
1278                 fprintf(stderr, "Invalid name for node.\n");
1279                 return 1;
1280         }
1281
1282         if(!found) {
1283                 if(force || action < 0) {
1284                         fprintf(stderr, "Warning: %s is not a known configuration variable!\n", variable);
1285                 } else {
1286                         fprintf(stderr, "%s: is not a known configuration variable! Use --force to use it anyway.\n", variable);
1287                         return 1;
1288                 }
1289         }
1290
1291         // Open the right configuration file.
1292         char *filename;
1293         if(node)
1294                 xasprintf(&filename, "%s" SLASH "%s", hosts_dir, node);
1295         else
1296                 filename = tinc_conf;
1297
1298         FILE *f = fopen(filename, "r");
1299         if(!f) {
1300                 if(action < 0 || errno != ENOENT) {
1301                         fprintf(stderr, "Could not open configuration file %s: %s\n", filename, strerror(errno));
1302                         return 1;
1303                 }
1304
1305                 // If it doesn't exist, create it.
1306                 f = fopen(filename, "a+");
1307                 if(!f) {
1308                         fprintf(stderr, "Could not create configuration file %s: %s\n", filename, strerror(errno));
1309                         return 1;
1310                 } else {
1311                         fprintf(stderr, "Created configuration file %s.\n", filename);
1312                 }
1313         }
1314
1315         char *tmpfile = NULL;
1316         FILE *tf = NULL;
1317
1318         if(action >= -1) {
1319                 xasprintf(&tmpfile, "%s.config.tmp", filename);
1320                 tf = fopen(tmpfile, "w");
1321                 if(!tf) {
1322                         fprintf(stderr, "Could not open temporary file %s: %s\n", tmpfile, strerror(errno));
1323                         fclose(f);
1324                         return 1;
1325                 }
1326         }
1327
1328         // Copy the file, making modifications on the fly, unless we are just getting a value.
1329         char buf1[4096];
1330         char buf2[4096];
1331         bool set = false;
1332         bool removed = false;
1333         found = false;
1334
1335         while(fgets(buf1, sizeof buf1, f)) {
1336                 buf1[sizeof buf1 - 1] = 0;
1337                 strncpy(buf2, buf1, sizeof buf2);
1338
1339                 // Parse line in a simple way
1340                 char *bvalue;
1341                 int len;
1342
1343                 len = strcspn(buf2, "\t =");
1344                 bvalue = buf2 + len;
1345                 bvalue += strspn(bvalue, "\t ");
1346                 if(*bvalue == '=') {
1347                         bvalue++;
1348                         bvalue += strspn(bvalue, "\t ");
1349                 }
1350                 rstrip(bvalue);
1351                 buf2[len] = '\0';
1352
1353                 // Did it match?
1354                 if(!strcasecmp(buf2, variable)) {
1355                         // Get
1356                         if(action < -1) {
1357                                 found = true;
1358                                 printf("%s\n", bvalue);
1359                         // Del
1360                         } else if(action == -1) {
1361                                 if(!*value || !strcasecmp(bvalue, value)) {
1362                                         removed = true;
1363                                         continue;
1364                                 }
1365                         // Set
1366                         } else if(action == 0) {
1367                                 // Already set? Delete the rest...
1368                                 if(set)
1369                                         continue;
1370                                 // Otherwise, replace.
1371                                 if(fprintf(tf, "%s = %s\n", variable, value) < 0) {
1372                                         fprintf(stderr, "Error writing to temporary file %s: %s\n", tmpfile, strerror(errno));
1373                                         return 1;
1374                                 }
1375                                 set = true;
1376                                 continue;
1377                         }
1378                 }
1379
1380                 if(action >= -1) {
1381                         // Copy original line...
1382                         if(fputs(buf1, tf) < 0) {
1383                                 fprintf(stderr, "Error writing to temporary file %s: %s\n", tmpfile, strerror(errno));
1384                                 return 1;
1385                         }
1386
1387                         // Add newline if it is missing...
1388                         if(*buf1 && buf1[strlen(buf1) - 1] != '\n') {
1389                                 if(fputc('\n', tf) < 0) {
1390                                         fprintf(stderr, "Error writing to temporary file %s: %s\n", tmpfile, strerror(errno));
1391                                         return 1;
1392                                 }
1393                         }
1394                 }
1395         }
1396
1397         // Make sure we read everything...
1398         if(ferror(f) || !feof(f)) {
1399                 fprintf(stderr, "Error while reading from configuration file %s: %s\n", filename, strerror(errno));
1400                 return 1;
1401         }
1402
1403         if(fclose(f)) {
1404                 fprintf(stderr, "Error closing configuration file %s: %s\n", filename, strerror(errno));
1405                 return 1;
1406         }
1407
1408         // Add new variable if necessary.
1409         if(action > 0 || (action == 0 && !set)) {
1410                 if(fprintf(tf, "%s = %s\n", variable, value) < 0) {
1411                         fprintf(stderr, "Error writing to temporary file %s: %s\n", tmpfile, strerror(errno));
1412                         return 1;
1413                 }
1414         }
1415
1416         if(action < -1) {
1417                 if(!found)
1418                         fprintf(stderr, "No matching configuration variables found.\n");
1419                 return 0;
1420         }
1421
1422         // Make sure we wrote everything...
1423         if(fclose(tf)) {
1424                 fprintf(stderr, "Error closing temporary file %s: %s\n", tmpfile, strerror(errno));
1425                 return 1;
1426         }
1427
1428         // Could we find what we had to remove?
1429         if(action < 0 && !removed) {
1430                 remove(tmpfile);
1431                 fprintf(stderr, "No configuration variables deleted.\n");
1432                 return *value;
1433         }
1434
1435         // Replace the configuration file with the new one
1436 #ifdef HAVE_MINGW
1437         if(remove(filename)) {
1438                 fprintf(stderr, "Error replacing file %s: %s\n", filename, strerror(errno));
1439                 return 1;
1440         }
1441 #endif
1442         if(rename(tmpfile, filename)) {
1443                 fprintf(stderr, "Error renaming temporary file %s to configuration file %s: %s\n", tmpfile, filename, strerror(errno));
1444                 return 1;
1445         }
1446
1447         // Silently try notifying a running tincd of changes.
1448         if(connect_tincd(false))
1449                 sendline(fd, "%d %d", CONTROL, REQ_RELOAD);
1450
1451         return 0;
1452 }
1453
1454 bool check_id(const char *name) {
1455         if(!name || !*name)
1456                 return false;
1457
1458         for(int i = 0; i < strlen(name); i++) {
1459                 if(!isalnum(name[i]) && name[i] != '_')
1460                         return false;
1461         }
1462
1463         return true;
1464 }
1465
1466 static int cmd_init(int argc, char *argv[]) {
1467         if(!access(tinc_conf, F_OK)) {
1468                 fprintf(stderr, "Configuration file %s already exists!\n", tinc_conf);
1469                 return 1;
1470         }
1471
1472         if(argc < 2) {
1473                 if(tty) {
1474                         char buf[1024];
1475                         fprintf(stdout, "Enter the Name you want your tinc node to have: ");
1476                         fflush(stdout);
1477                         if(!fgets(buf, sizeof buf, stdin)) {
1478                                 fprintf(stderr, "Error while reading stdin: %s\n", strerror(errno));
1479                                 return 1;
1480                         }
1481                         int len = rstrip(buf);
1482                         if(!len) {
1483                                 fprintf(stderr, "No name given!\n");
1484                                 return 1;
1485                         }
1486                         name = strdup(buf);
1487                 } else {
1488                         fprintf(stderr, "No Name given!\n");
1489                         return 1;
1490                 }
1491         } else {
1492                 name = strdup(argv[1]);
1493                 if(!*name) {
1494                         fprintf(stderr, "No Name given!\n");
1495                         return 1;
1496                 }
1497         }
1498
1499         if(!check_id(name)) {
1500                 fprintf(stderr, "Invalid Name! Only a-z, A-Z, 0-9 and _ are allowed characters.\n");
1501                 return 1;
1502         }
1503
1504         if(mkdir(confdir, 0755) && errno != EEXIST) {
1505                 fprintf(stderr, "Could not create directory %s: %s\n", CONFDIR, strerror(errno));
1506                 return 1;
1507         }
1508
1509         if(mkdir(confbase, 0755) && errno != EEXIST) {
1510                 fprintf(stderr, "Could not create directory %s: %s\n", confbase, strerror(errno));
1511                 return 1;
1512         }
1513
1514         if(mkdir(hosts_dir, 0755) && errno != EEXIST) {
1515                 fprintf(stderr, "Could not create directory %s: %s\n", hosts_dir, strerror(errno));
1516                 return 1;
1517         }
1518
1519         FILE *f = fopen(tinc_conf, "w");
1520         if(!f) {
1521                 fprintf(stderr, "Could not create file %s: %s\n", tinc_conf, strerror(errno));
1522                 return 1;
1523         }
1524
1525         fprintf(f, "Name = %s\n", name);
1526         fclose(f);
1527
1528         if(!rsa_keygen(2048, false) || !ecdsa_keygen(false))
1529                 return 1;
1530
1531 #ifndef HAVE_MINGW
1532         char *filename;
1533         xasprintf(&filename, "%s" SLASH "tinc-up", confbase);
1534         if(access(filename, F_OK)) {
1535                 FILE *f = fopen(filename, "w");
1536                 if(!f) {
1537                         fprintf(stderr, "Could not create file %s: %s\n", filename, strerror(errno));
1538                         return 1;
1539                 }
1540                 fchmod(fileno(f), 0755);
1541                 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");
1542                 fclose(f);
1543         }
1544 #endif
1545
1546         return 0;
1547
1548 }
1549
1550 static int cmd_generate_keys(int argc, char *argv[]) {
1551         return !(rsa_keygen(argc > 1 ? atoi(argv[1]) : 2048, true) && ecdsa_keygen(true));
1552 }
1553
1554 static int cmd_generate_rsa_keys(int argc, char *argv[]) {
1555         return !rsa_keygen(argc > 1 ? atoi(argv[1]) : 2048, true);
1556 }
1557
1558 static int cmd_generate_ecdsa_keys(int argc, char *argv[]) {
1559         return !ecdsa_keygen(true);
1560 }
1561
1562 static int cmd_help(int argc, char *argv[]) {
1563         usage(false);
1564         return 0;
1565 }
1566
1567 static int cmd_version(int argc, char *argv[]) {
1568         version();
1569         return 0;
1570 }
1571
1572 static int cmd_info(int argc, char *argv[]) {
1573         if(argc != 2) {
1574                 fprintf(stderr, "Invalid number of arguments.\n");
1575                 return 1;
1576         }
1577
1578         if(!connect_tincd(true))
1579                 return 1;
1580
1581         return info(fd, argv[1]);
1582 }
1583
1584 static const char *conffiles[] = {
1585         "tinc.conf",
1586         "tinc-up",
1587         "tinc-down",
1588         "subnet-up",
1589         "subnet-down",
1590         "host-up",
1591         "host-down",
1592         NULL,
1593 };
1594
1595 static int cmd_edit(int argc, char *argv[]) {
1596         if(argc != 2) {
1597                 fprintf(stderr, "Invalid number of arguments.\n");
1598                 return 1;
1599         }
1600
1601         char *filename = NULL;
1602
1603         if(strncmp(argv[1], "hosts" SLASH, 6)) {
1604                 for(int i = 0; conffiles[i]; i++) {
1605                         if(!strcmp(argv[1], conffiles[i])) {
1606                                 xasprintf(&filename, "%s" SLASH "%s", confbase, argv[1]);
1607                                 break;
1608                         }
1609                 }
1610         } else {
1611                 argv[1] += 6;
1612         }
1613
1614         if(!filename) {
1615                 xasprintf(&filename, "%s" SLASH "%s", hosts_dir, argv[1]);
1616                 char *dash = strchr(argv[1], '-');
1617                 if(dash) {
1618                         *dash++ = 0;
1619                         if((strcmp(dash, "up") && strcmp(dash, "down")) || !check_id(argv[1])) {
1620                                 fprintf(stderr, "Invalid configuration filename.\n");
1621                                 return 1;
1622                         }
1623                 }
1624         }
1625
1626         char *command;
1627 #ifndef HAVE_MINGW
1628         xasprintf(&command, "\"%s\" \"%s\"", getenv("VISUAL") ?: getenv("EDITOR") ?: "vi", filename);
1629 #else
1630         xasprintf(&command, "edit \"%s\"", filename);
1631 #endif
1632         int result = system(command);
1633         if(result)
1634                 return result;
1635
1636         // Silently try notifying a running tincd of changes.
1637         if(connect_tincd(false))
1638                 sendline(fd, "%d %d", CONTROL, REQ_RELOAD);
1639
1640         return 0;
1641 }
1642
1643 static int export(const char *name, FILE *out) {
1644         char *filename;
1645         xasprintf(&filename, "%s" SLASH "%s", hosts_dir, name);
1646         FILE *in = fopen(filename, "r");
1647         if(!in) {
1648                 fprintf(stderr, "Could not open configuration file %s: %s\n", filename, strerror(errno));
1649                 return 1;
1650         }
1651
1652         fprintf(out, "Name = %s\n", name);
1653         char buf[4096];
1654         while(fgets(buf, sizeof buf, in)) {
1655                 if(strcspn(buf, "\t =") != 4 || strncasecmp(buf, "Name", 4))
1656                         fputs(buf, out);
1657         }
1658
1659         if(ferror(in)) {
1660                 fprintf(stderr, "Error while reading configuration file %s: %s\n", filename, strerror(errno));
1661                 fclose(in);
1662                 return 1;
1663         }
1664
1665         fclose(in);
1666         return 0;
1667 }
1668
1669 static int cmd_export(int argc, char *argv[]) {
1670         char *name = get_my_name();
1671         if(!name)
1672                 return 1;
1673
1674         return export(name, stdout);
1675 }
1676
1677 static int cmd_export_all(int argc, char *argv[]) {
1678         DIR *dir = opendir(hosts_dir);
1679         if(!dir) {
1680                 fprintf(stderr, "Could not open host configuration directory %s: %s\n", hosts_dir, strerror(errno));
1681                 return 1;
1682         }
1683
1684         bool first = true;
1685         int result = 0;
1686         struct dirent *ent;
1687
1688         while((ent = readdir(dir))) {
1689                 if(!check_id(ent->d_name))
1690                         continue;
1691
1692                 if(first)
1693                         first = false;
1694                 else
1695                         printf("#---------------------------------------------------------------#\n");
1696
1697                 result |= export(ent->d_name, stdout);
1698         }
1699
1700         closedir(dir);
1701         return result;
1702 }
1703
1704 static int cmd_import(int argc, char *argv[]) {
1705         FILE *in = stdin;
1706         FILE *out = NULL;
1707
1708         char buf[4096];
1709         char name[4096];
1710         char *filename;
1711         int count = 0;
1712         bool firstline = true;
1713
1714         while(fgets(buf, sizeof buf, in)) {
1715                 if(sscanf(buf, "Name = %s", name) == 1) {
1716                         if(!check_id(name)) {
1717                                 fprintf(stderr, "Invalid Name in input!\n");
1718                                 return 1;
1719                         }
1720
1721                         if(out)
1722                                 fclose(out);
1723
1724                         free(filename);
1725                         xasprintf(&filename, "%s" SLASH "%s", hosts_dir, name);
1726
1727                         if(!force && !access(filename, F_OK)) {
1728                                 fprintf(stderr, "Host configuration file %s already exists, skipping.\n", filename);
1729                                 out = NULL;
1730                                 continue;
1731                         }
1732
1733                         out = fopen(filename, "w");
1734                         if(!out) {
1735                                 fprintf(stderr, "Error creating configuration file %s: %s\n", filename, strerror(errno));
1736                                 return 1;
1737                         }
1738
1739                         count++;
1740                         firstline = false;
1741                         continue;
1742                 } else if(firstline) {
1743                         fprintf(stderr, "Junk at the beginning of the input, ignoring.\n");
1744                         firstline = false;
1745                 }
1746
1747
1748                 if(!strcmp(buf, "#---------------------------------------------------------------#\n"))
1749                         continue;
1750
1751                 if(out) {
1752                         if(fputs(buf, out) < 0) {
1753                                 fprintf(stderr, "Error writing to host configuration file %s: %s\n", filename, strerror(errno));
1754                                 return 1;
1755                         }
1756                 }
1757         }
1758
1759         if(out)
1760                 fclose(out);
1761
1762         if(count) {
1763                 fprintf(stderr, "Imported %d host configuration files.\n", count);
1764                 return 0;
1765         } else {
1766                 fprintf(stderr, "No host configuration files imported.\n");
1767                 return 1;
1768         }
1769 }
1770
1771 static const struct {
1772         const char *command;
1773         int (*function)(int argc, char *argv[]);
1774 } commands[] = {
1775         {"start", cmd_start},
1776         {"stop", cmd_stop},
1777         {"restart", cmd_restart},
1778         {"reload", cmd_reload},
1779         {"dump", cmd_dump},
1780         {"purge", cmd_purge},
1781         {"debug", cmd_debug},
1782         {"retry", cmd_retry},
1783         {"connect", cmd_connect},
1784         {"disconnect", cmd_disconnect},
1785         {"top", cmd_top},
1786         {"pcap", cmd_pcap},
1787         {"log", cmd_log},
1788         {"pid", cmd_pid},
1789         {"config", cmd_config},
1790         {"init", cmd_init},
1791         {"generate-keys", cmd_generate_keys},
1792         {"generate-rsa-keys", cmd_generate_rsa_keys},
1793         {"generate-ecdsa-keys", cmd_generate_ecdsa_keys},
1794         {"help", cmd_help},
1795         {"version", cmd_version},
1796         {"info", cmd_info},
1797         {"edit", cmd_edit},
1798         {"export", cmd_export},
1799         {"export-all", cmd_export_all},
1800         {"import", cmd_import},
1801         {NULL, NULL},
1802 };
1803
1804 #ifdef HAVE_READLINE
1805 static char *complete_command(const char *text, int state) {
1806         static int i;
1807
1808         if(!state)
1809                 i = 0;
1810         else
1811                 i++;
1812
1813         while(commands[i].command) {
1814                 if(!strncasecmp(commands[i].command, text, strlen(text)))
1815                         return xstrdup(commands[i].command);
1816                 i++;
1817         }
1818
1819         return NULL;
1820 }
1821
1822 static char *complete_dump(const char *text, int state) {
1823         const char *matches[] = {"nodes", "edges", "subnets", "connections", "graph", NULL};
1824         static int i;
1825
1826         if(!state)
1827                 i = 0;
1828         else
1829                 i++;
1830
1831         while(matches[i]) {
1832                 if(!strncasecmp(matches[i], text, strlen(text)))
1833                         return xstrdup(matches[i]);
1834                 i++;
1835         }
1836
1837         return NULL;
1838 }
1839
1840 static char *complete_config(const char *text, int state) {
1841         const char *sub[] = {"get", "set", "add", "del"};
1842         static int i;
1843         if(!state) {
1844                 i = 0;
1845                 if(!strchr(rl_line_buffer + 7, ' '))
1846                         i = -4;
1847                 else {
1848                         bool found = false;
1849                         for(int i = 0; i < 4; i++) {
1850                                 if(!strncasecmp(rl_line_buffer + 7, sub[i], strlen(sub[i])) && rl_line_buffer[7 + strlen(sub[i])] == ' ') {
1851                                         found = true;
1852                                         break;
1853                                 }
1854                         }
1855                         if(!found)
1856                                 return NULL;
1857                 }
1858         } else {
1859                 i++;
1860         }
1861
1862         while(i < 0 || variables[i].name) {
1863                 if(i < 0 && !strncasecmp(sub[i + 4], text, strlen(text)))
1864                         return xstrdup(sub[i + 4]);
1865                 if(i >= 0) {
1866                         char *dot = strchr(text, '.');
1867                         if(dot) {
1868                                 if((variables[i].type & VAR_HOST) && !strncasecmp(variables[i].name, dot + 1, strlen(dot + 1))) {
1869                                         char *match;
1870                                         xasprintf(&match, "%.*s.%s", dot - text, text, variables[i].name);
1871                                         return match;
1872                                 }
1873                         } else {
1874                                 if(!strncasecmp(variables[i].name, text, strlen(text)))
1875                                         return xstrdup(variables[i].name);
1876                         }
1877                 }
1878                 i++;
1879         }
1880
1881         return NULL;
1882 }
1883
1884 static char *complete_info(const char *text, int state) {
1885         static int i;
1886         if(!state) {
1887                 i = 0;
1888                 if(!connect_tincd(false))
1889                         return NULL;
1890                 // Check the list of nodes
1891                 sendline(fd, "%d %d", CONTROL, REQ_DUMP_NODES);
1892                 sendline(fd, "%d %d", CONTROL, REQ_DUMP_SUBNETS);
1893         }
1894
1895         while(recvline(fd, line, sizeof line)) {
1896                 char item[4096];
1897                 int n = sscanf(line, "%d %d %s", &code, &req, item);
1898                 if(n == 2) {
1899                         i++;
1900                         if(i >= 2)
1901                                 break;
1902                         else
1903                                 continue;
1904                 }
1905
1906                 if(n != 3) {
1907                         fprintf(stderr, "Unable to parse dump from tincd, n = %d, i = %d.\n", n, i);
1908                         break;
1909                 }
1910
1911                 if(!strncmp(item, text, strlen(text)))
1912                         return xstrdup(strip_weight(item));
1913         }
1914
1915         return NULL;
1916 }
1917
1918 static char *complete_nothing(const char *text, int state) {
1919         return NULL;
1920 }
1921
1922 static char **completion (const char *text, int start, int end) {
1923         char **matches = NULL;
1924
1925         if(!start)
1926                 matches = rl_completion_matches(text, complete_command);
1927         else if(!strncasecmp(rl_line_buffer, "dump ", 5))
1928                 matches = rl_completion_matches(text, complete_dump);
1929         else if(!strncasecmp(rl_line_buffer, "config ", 7))
1930                 matches = rl_completion_matches(text, complete_config);
1931         else if(!strncasecmp(rl_line_buffer, "info ", 5))
1932                 matches = rl_completion_matches(text, complete_info);
1933
1934         return matches;
1935 }
1936 #endif
1937
1938 static int cmd_shell(int argc, char *argv[]) {
1939         char *prompt;
1940         xasprintf(&prompt, "%s> ", identname);
1941         int result = 0;
1942         char buf[4096];
1943         char *line = NULL;
1944         int maxargs = argc + 16;
1945         char **nargv = xmalloc(maxargs * sizeof *nargv);
1946         optind = argc;
1947
1948         for(int i = 0; i < argc; i++)
1949                 nargv[i] = argv[i];
1950
1951 #ifdef HAVE_READLINE
1952         rl_readline_name = "tinc";
1953         rl_completion_entry_function = complete_nothing;
1954         rl_attempted_completion_function = completion;
1955         rl_filename_completion_desired = 0;
1956         char *copy = NULL;
1957 #endif
1958
1959         while(true) {
1960 #ifdef HAVE_READLINE
1961                 if(tty) {
1962                         free(copy);
1963                         free(line);
1964                         rl_basic_word_break_characters = "\t\n ";
1965                         line = readline(prompt);
1966                         if(line)
1967                                 copy = xstrdup(line);
1968                 } else {
1969                         line = fgets(buf, sizeof buf, stdin);
1970                 }
1971 #else
1972                 if(tty)
1973                         fputs(prompt, stdout);
1974
1975                 line = fgets(buf, sizeof buf, stdin);
1976 #endif
1977
1978                 if(!line)
1979                         break;
1980
1981                 /* Ignore comments */
1982
1983                 if(*line == '#')
1984                         continue;
1985
1986                 /* Split */
1987
1988                 int nargc = argc;
1989                 char *p = line + strspn(line, " \t\n");
1990                 char *next = strtok(p, " \t\n");
1991
1992                 while(p && *p) {
1993                         if(nargc >= maxargs) {
1994                                 fprintf(stderr, "next %p '%s', p %p '%s'\n", next, next, p, p);
1995                                 abort();
1996                                 maxargs *= 2;
1997                                 nargv = xrealloc(nargv, maxargs * sizeof *nargv);
1998                         }
1999
2000                         nargv[nargc++] = p;
2001                         p = next;
2002                         next = strtok(NULL, " \t\n");
2003                 }
2004
2005                 if(nargc == argc)
2006                         continue;
2007
2008                 if(!strcasecmp(nargv[argc], "exit") || !strcasecmp(nargv[argc], "quit"))
2009                         return result;
2010
2011                 bool found = false;
2012
2013                 for(int i = 0; commands[i].command; i++) {
2014                         if(!strcasecmp(nargv[argc], commands[i].command)) {
2015                                 result |= commands[i].function(nargc - argc - 1, nargv + argc + 1);
2016                                 found = true;
2017                                 break;
2018                         }
2019                 }
2020
2021 #ifdef HAVE_READLINE
2022                 if(tty && found)
2023                         add_history(copy);
2024 #endif
2025
2026                 if(!found) {
2027                         fprintf(stderr, "Unknown command `%s'.\n", nargv[argc]);
2028                         result |= 1;
2029                 }
2030         }
2031
2032         if(tty)
2033                 printf("\n");
2034         return result;
2035 }
2036
2037
2038 int main(int argc, char *argv[]) {
2039         program_name = argv[0];
2040         orig_argv = argv;
2041         orig_argc = argc;
2042
2043         if(!parse_options(argc, argv))
2044                 return 1;
2045
2046         make_names();
2047
2048         if(show_version) {
2049                 version();
2050                 return 0;
2051         }
2052
2053         if(show_help) {
2054                 usage(false);
2055                 return 0;
2056         }
2057
2058         tty = isatty(0) && isatty(1);
2059
2060         if(optind >= argc)
2061                 return cmd_shell(argc, argv);
2062
2063         for(int i = 0; commands[i].command; i++) {
2064                 if(!strcasecmp(argv[optind], commands[i].command))
2065                         return commands[i].function(argc - optind, argv + optind);
2066         }
2067
2068         fprintf(stderr, "Unknown command `%s'.\n", argv[optind]);
2069         usage(true);
2070         return 1;
2071 }