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

   1 /*
   2     tincctl.c -- Controlling a running tincd
   3     Copyright (C) 2007-2014 Guus Sliepen <guus@tinc-vpn.org>
   4
   5     This program is free software; you can redistribute it and/or modify
   6     it under the terms of the GNU General Public License as published by
   7     the Free Software Foundation; either version 2 of the License, or
   8     (at your option) any later version.
   9
  10     This program is distributed in the hope that it will be useful,
  11     but WITHOUT ANY WARRANTY; without even the implied warranty of
  12     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13     GNU General Public License for more details.
  14
  15     You should have received a copy of the GNU General Public License along
  16     with this program; if not, write to the Free Software Foundation, Inc.,
  17     51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  18 */
  19
  20 #include "system.h"
  21
  22 #include <getopt.h>
  23
  24 #ifdef HAVE_READLINE
  25 #include "readline/readline.h"
  26 #include "readline/history.h"
  27 #endif
  28
  29 #include "xalloc.h"
  30 #include "protocol.h"
  31 #include "control_common.h"
  32 #include "crypto.h"
  33 #include "ecdsagen.h"
  34 #include "info.h"
  35 #include "invitation.h"
  36 #include "names.h"
  37 #include "rsagen.h"
  38 #include "utils.h"
  39 #include "tincctl.h"
  40 #include "top.h"
  41 #include "version.h"
  42
  43 #ifndef MSG_NOSIGNAL
  44 #define MSG_NOSIGNAL 0
  45 #endif
  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 controlcookie[1025];
  58 char *tinc_conf = NULL;
  59 char *hosts_dir = NULL;
  60 struct timeval now;
  61
  62 // Horrible global variables...
  63 static int pid = 0;
  64 int fd = -1;
  65 char line[4096];
  66 static int code;
  67 static int req;
  68 static int result;
  69 static bool force = false;
  70 bool tty = true;
  71 bool confbasegiven = false;
  72 bool netnamegiven = false;
  73 char *scriptinterpreter = NULL;
  74 char *scriptextension = "";
  75 static char *prompt;
  76
  77 static struct option const long_options[] = {
  78         {"config", required_argument, NULL, 'c'},
  79         {"net", required_argument, NULL, 'n'},
  80         {"help", no_argument, NULL, 1},
  81         {"version", no_argument, NULL, 2},
  82         {"pidfile", required_argument, NULL, 3},
  83         {"force", no_argument, NULL, 4},
  84         {NULL, 0, NULL, 0}
  85 };
  86
  87 static void version(void) {
  88         printf("%s version %s (built %s %s, protocol %d.%d)\n", PACKAGE,
  89                    VERSION, BUILD_DATE, BUILD_TIME, PROT_MAJOR, PROT_MINOR);
  90         printf("Copyright (C) 1998-2012 Ivo Timmermans, Guus Sliepen and others.\n"
  91                         "See the AUTHORS file for a complete list.\n\n"
  92                         "tinc comes with ABSOLUTELY NO WARRANTY.  This is free software,\n"
  93                         "and you are welcome to redistribute it under certain conditions;\n"
  94                         "see the file COPYING for details.\n");
  95 }
  96
  97 static void usage(bool status) {
  98         if(status) {
  99                 fprintf(stderr, "Try `%s --help\' for more information.\n", program_name);
 100         } else {
 101                 printf("Usage: %s [options] command\n\n", program_name);
 102                 printf("Valid options are:\n"
 103                                 "  -c, --config=DIR        Read configuration options from DIR.\n"
 104                                 "  -n, --net=NETNAME       Connect to net NETNAME.\n"
 105                                 "      --pidfile=FILENAME  Read control cookie from FILENAME.\n"
 106                                 "      --help              Display this help and exit.\n"
 107                                 "      --version           Output version information and exit.\n"
 108                                 "\n"
 109                                 "Valid commands are:\n"
 110                                 "  init [name]                Create initial configuration files.\n"
 111                                 "  get VARIABLE               Print current value of VARIABLE\n"
 112                                 "  set VARIABLE VALUE         Set VARIABLE to VALUE\n"
 113                                 "  add VARIABLE VALUE         Add VARIABLE with the given VALUE\n"
 114                                 "  del VARIABLE [VALUE]       Remove VARIABLE [only ones with watching VALUE]\n"
 115                                 "  start [tincd options]      Start tincd.\n"
 116                                 "  stop                       Stop tincd.\n"
 117                                 "  restart [tincd options]    Restart tincd.\n"
 118                                 "  reload                     Partially reload configuration of running tincd.\n"
 119                                 "  pid                        Show PID of currently running tincd.\n"
 120                                 "  generate-keys [bits]       Generate new RSA and Ed25519 public/private keypairs.\n"
 121                                 "  generate-rsa-keys [bits]   Generate a new RSA public/private keypair.\n"
 122                                 "  generate-ed25519-keys      Generate a new Ed25519 public/private keypair.\n"
 123                                 "  dump                       Dump a list of one of the following things:\n"
 124                                 "    [reachable] nodes        - all known nodes in the VPN\n"
 125                                 "    edges                    - all known connections in the VPN\n"
 126                                 "    subnets                  - all known subnets in the VPN\n"
 127                                 "    connections              - all meta connections with ourself\n"
 128                                 "    [di]graph                - graph of the VPN in dotty format\n"
 129                                 "  info NODE|SUBNET|ADDRESS   Give information about a particular NODE, SUBNET or ADDRESS.\n"
 130                                 "  purge                      Purge unreachable nodes\n"
 131                                 "  debug N                    Set debug level\n"
 132                                 "  retry                      Retry all outgoing connections\n"
 133                                 "  disconnect NODE            Close meta connection with NODE\n"
 134 #ifdef HAVE_CURSES
 135                                 "  top                        Show real-time statistics\n"
 136 #endif
 137                                 "  pcap [snaplen]             Dump traffic in pcap format [up to snaplen bytes per packet]\n"
 138                                 "  log [level]                Dump log output [up to the specified level]\n"
 139                                 "  export                     Export host configuration of local node to standard output\n"
 140                                 "  export-all                 Export all host configuration files to standard output\n"
 141                                 "  import [--force]           Import host configuration file(s) from standard input\n"
 142                                 "  exchange [--force]         Same as export followed by import\n"
 143                                 "  exchange-all [--force]     Same as export-all followed by import\n"
 144                                 "  invite NODE [...]          Generate an invitation for NODE\n"
 145                                 "  join INVITATION            Join a VPN using an INVITIATION\n"
 146                                 "  network [NETNAME]          List all known networks, or switch to the one named NETNAME.\n"
 147                                 "\n");
 148                 printf("Report bugs to tinc@tinc-vpn.org.\n");
 149         }
 150 }
 151
 152 static bool parse_options(int argc, char **argv) {
 153         int r;
 154         int option_index = 0;
 155
 156         while((r = getopt_long(argc, argv, "+c:n:", long_options, &option_index)) != EOF) {
 157                 switch (r) {
 158                         case 0:   /* long option */
 159                                 break;
 160
 161                         case 'c': /* config file */
 162                                 confbase = xstrdup(optarg);
 163                                 confbasegiven = true;
 164                                 break;
 165
 166                         case 'n': /* net name given */
 167                                 netname = xstrdup(optarg);
 168                                 break;
 169
 170                         case 1:   /* show help */
 171                                 show_help = true;
 172                                 break;
 173
 174                         case 2:   /* show version */
 175                                 show_version = true;
 176                                 break;
 177
 178                         case 3:   /* open control socket here */
 179                                 pidfilename = xstrdup(optarg);
 180                                 break;
 181
 182                         case 4:   /* force */
 183                                 force = true;
 184                                 break;
 185
 186                         case '?': /* wrong options */
 187                                 usage(true);
 188                                 return false;
 189
 190                         default:
 191                                 break;
 192                 }
 193         }
 194
 195         if(!netname && (netname = getenv("NETNAME")))
 196                 netname = xstrdup(netname);
 197
 198         /* netname "." is special: a "top-level name" */
 199
 200         if(netname && (!*netname || !strcmp(netname, "."))) {
 201                 free(netname);
 202                 netname = NULL;
 203         }
 204
 205         if(netname && (strpbrk(netname, "\\/") || *netname == '.')) {
 206                 fprintf(stderr, "Invalid character in netname!\n");
 207                 return false;
 208         }
 209
 210         return true;
 211 }
 212
 213 /* Open a file with the desired permissions, minus the umask.
 214    Also, if we want to create an executable file, we call fchmod()
 215    to set the executable bits. */
 216
 217 FILE *fopenmask(const char *filename, const char *mode, mode_t perms) {
 218         mode_t mask = umask(0);
 219         perms &= ~mask;
 220         umask(~perms);
 221         FILE *f = fopen(filename, mode);
 222 #ifdef HAVE_FCHMOD
 223         if((perms & 0444) && f)
 224                 fchmod(fileno(f), perms);
 225 #endif
 226         umask(mask);
 227         return f;
 228 }
 229
 230 static void disable_old_keys(const char *filename, const char *what) {
 231         char tmpfile[PATH_MAX] = "";
 232         char buf[1024];
 233         bool disabled = false;
 234         bool block = false;
 235         bool error = false;
 236         FILE *r, *w;
 237
 238         r = fopen(filename, "r");
 239         if(!r)
 240                 return;
 241
 242         snprintf(tmpfile, sizeof tmpfile, "%s.tmp", filename);
 243
 244         struct stat st = {.st_mode = 0600};
 245         fstat(fileno(r), &st);
 246         w = fopenmask(tmpfile, "w", st.st_mode);
 247
 248         while(fgets(buf, sizeof buf, r)) {
 249                 if(!block && !strncmp(buf, "-----BEGIN ", 11)) {
 250                         if((strstr(buf, " ED25519 ") && strstr(what, "Ed25519")) || (strstr(buf, " RSA ") && strstr(what, "RSA"))) {
 251                                 disabled = true;
 252                                 block = true;
 253                         }
 254                 }
 255
 256                 bool ed25519pubkey = !strncasecmp(buf, "Ed25519PublicKey", 16) && strchr(" \t=", buf[16]) && strstr(what, "Ed25519");
 257
 258                 if(ed25519pubkey)
 259                         disabled = true;
 260
 261                 if(w) {
 262                         if(block || ed25519pubkey)
 263                                 fputc('#', w);
 264                         if(fputs(buf, w) < 0) {
 265                                 error = true;
 266                                 break;
 267                         }
 268                 }
 269
 270                 if(block && !strncmp(buf, "-----END ", 9))
 271                         block = false;
 272         }
 273
 274         if(w)
 275                 if(fclose(w) < 0)
 276                         error = true;
 277         if(ferror(r) || fclose(r) < 0)
 278                 error = true;
 279
 280         if(disabled) {
 281                 if(!w || error) {
 282                         fprintf(stderr, "Warning: old key(s) found, remove them by hand!\n");
 283                         if(w)
 284                                 unlink(tmpfile);
 285                         return;
 286                 }
 287
 288 #ifdef HAVE_MINGW
 289                 // We cannot atomically replace files on Windows.
 290                 char bakfile[PATH_MAX] = "";
 291                 snprintf(bakfile, sizeof bakfile, "%s.bak", filename);
 292                 if(rename(filename, bakfile) || rename(tmpfile, filename)) {
 293                         rename(bakfile, filename);
 294 #else
 295                 if(rename(tmpfile, filename)) {
 296 #endif
 297                         fprintf(stderr, "Warning: old key(s) found, remove them by hand!\n");
 298                 } else  {
 299 #ifdef HAVE_MINGW
 300                         unlink(bakfile);
 301 #endif
 302                         fprintf(stderr, "Warning: old key(s) found and disabled.\n");
 303                 }
 304         }
 305
 306         unlink(tmpfile);
 307 }
 308
 309 static FILE *ask_and_open(const char *filename, const char *what, const char *mode, bool ask, mode_t perms) {
 310         FILE *r;
 311         char *directory;
 312         char buf[PATH_MAX];
 313         char buf2[PATH_MAX];
 314
 315         /* Check stdin and stdout */
 316         if(ask && tty) {
 317                 /* Ask for a file and/or directory name. */
 318                 fprintf(stderr, "Please enter a file to save %s to [%s]: ", what, filename);
 319
 320                 if(fgets(buf, sizeof buf, stdin) == NULL) {
 321                         fprintf(stderr, "Error while reading stdin: %s\n", strerror(errno));
 322                         return NULL;
 323                 }
 324
 325                 size_t len = strlen(buf);
 326                 if(len)
 327                         buf[--len] = 0;
 328
 329                 if(len)
 330                         filename = buf;
 331         }
 332
 333 #ifdef HAVE_MINGW
 334         if(filename[0] != '\\' && filename[0] != '/' && !strchr(filename, ':')) {
 335 #else
 336         if(filename[0] != '/') {
 337 #endif
 338                 /* The directory is a relative path or a filename. */
 339                 directory = get_current_dir_name();
 340                 snprintf(buf2, sizeof buf2, "%s" SLASH "%s", directory, filename);
 341                 filename = buf2;
 342         }
 343
 344         disable_old_keys(filename, what);
 345
 346         /* Open it first to keep the inode busy */
 347
 348         r = fopenmask(filename, mode, perms);
 349
 350         if(!r) {
 351                 fprintf(stderr, "Error opening file `%s': %s\n", filename, strerror(errno));
 352                 return NULL;
 353         }
 354
 355         return r;
 356 }
 357
 358 /*
 359   Generate a public/private Ed25519 keypair, and ask for a file to store
 360   them in.
 361 */
 362 static bool ed25519_keygen(bool ask) {
 363         ecdsa_t *key;
 364         FILE *f;
 365         char *pubname, *privname;
 366
 367         fprintf(stderr, "Generating Ed25519 keypair:\n");
 368
 369         if(!(key = ecdsa_generate())) {
 370                 fprintf(stderr, "Error during key generation!\n");
 371                 return false;
 372         } else
 373                 fprintf(stderr, "Done.\n");
 374
 375         xasprintf(&privname, "%s" SLASH "ed25519_key.priv", confbase);
 376         f = ask_and_open(privname, "private Ed25519 key", "a", ask, 0600);
 377         free(privname);
 378
 379         if(!f)
 380                 return false;
 381
 382         if(!ecdsa_write_pem_private_key(key, f)) {
 383                 fprintf(stderr, "Error writing private key!\n");
 384                 ecdsa_free(key);
 385                 fclose(f);
 386                 return false;
 387         }
 388
 389         fclose(f);
 390
 391         if(name)
 392                 xasprintf(&pubname, "%s" SLASH "hosts" SLASH "%s", confbase, name);
 393         else
 394                 xasprintf(&pubname, "%s" SLASH "ed25519_key.pub", confbase);
 395
 396         f = ask_and_open(pubname, "public Ed25519 key", "a", ask, 0666);
 397         free(pubname);
 398
 399         if(!f)
 400                 return false;
 401
 402         char *pubkey = ecdsa_get_base64_public_key(key);
 403         fprintf(f, "Ed25519PublicKey = %s\n", pubkey);
 404         free(pubkey);
 405
 406         fclose(f);
 407         ecdsa_free(key);
 408
 409         return true;
 410 }
 411
 412 /*
 413   Generate a public/private RSA keypair, and ask for a file to store
 414   them in.
 415 */
 416 static bool rsa_keygen(int bits, bool ask) {
 417         rsa_t *key;
 418         FILE *f;
 419         char *pubname, *privname;
 420
 421         // Make sure the key size is a multiple of 8 bits.
 422         bits &= ~0x7;
 423
 424         // Force them to be between 1024 and 8192 bits long.
 425         if(bits < 1024)
 426                 bits = 1024;
 427         if(bits > 8192)
 428                 bits = 8192;
 429
 430         fprintf(stderr, "Generating %d bits keys:\n", bits);
 431
 432         if(!(key = rsa_generate(bits, 0x10001))) {
 433                 fprintf(stderr, "Error during key generation!\n");
 434                 return false;
 435         } else
 436                 fprintf(stderr, "Done.\n");
 437
 438         xasprintf(&privname, "%s" SLASH "rsa_key.priv", confbase);
 439         f = ask_and_open(privname, "private RSA key", "a", ask, 0600);
 440         free(privname);
 441
 442         if(!f)
 443                 return false;
 444
 445         if(!rsa_write_pem_private_key(key, f)) {
 446                 fprintf(stderr, "Error writing private key!\n");
 447                 fclose(f);
 448                 rsa_free(key);
 449                 return false;
 450         }
 451
 452         fclose(f);
 453
 454         if(name)
 455                 xasprintf(&pubname, "%s" SLASH "hosts" SLASH "%s", confbase, name);
 456         else
 457                 xasprintf(&pubname, "%s" SLASH "rsa_key.pub", confbase);
 458
 459         f = ask_and_open(pubname, "public RSA key", "a", ask, 0666);
 460         free(pubname);
 461
 462         if(!f)
 463                 return false;
 464
 465         if(!rsa_write_pem_public_key(key, f)) {
 466                 fprintf(stderr, "Error writing public key!\n");
 467                 fclose(f);
 468                 rsa_free(key);
 469                 return false;
 470         }
 471
 472         fclose(f);
 473         rsa_free(key);
 474
 475         return true;
 476 }
 477
 478 char buffer[4096];
 479 size_t blen = 0;
 480
 481 bool recvline(int fd, char *line, size_t len) {
 482         char *newline = NULL;
 483
 484         if(!fd)
 485                 abort();
 486
 487         while(!(newline = memchr(buffer, '\n', blen))) {
 488                 int result = recv(fd, buffer + blen, sizeof buffer - blen, 0);
 489                 if(result == -1 && sockerrno == EINTR)
 490                         continue;
 491                 else if(result <= 0)
 492                         return false;
 493                 blen += result;
 494         }
 495
 496         if(newline - buffer >= len)
 497                 return false;
 498
 499         len = newline - buffer;
 500
 501         memcpy(line, buffer, len);
 502         line[len] = 0;
 503         memmove(buffer, newline + 1, blen - len - 1);
 504         blen -= len + 1;
 505
 506         return true;
 507 }
 508
 509 bool recvdata(int fd, char *data, size_t len) {
 510         if(len == -1)
 511                 len = blen;
 512
 513         while(blen < len) {
 514                 int result = recv(fd, buffer + blen, sizeof buffer - blen, 0);
 515                 if(result == -1 && sockerrno == EINTR)
 516                         continue;
 517                 else if(result <= 0)
 518                         return false;
 519                 blen += result;
 520         }
 521
 522         memcpy(data, buffer, len);
 523         memmove(buffer, buffer + len, blen - len);
 524         blen -= len;
 525
 526         return true;
 527 }
 528
 529 bool sendline(int fd, char *format, ...) {
 530         static char buffer[4096];
 531         char *p = buffer;
 532         int blen = 0;
 533         va_list ap;
 534
 535         va_start(ap, format);
 536         blen = vsnprintf(buffer, sizeof buffer, format, ap);
 537         va_end(ap);
 538
 539         if(blen < 1 || blen >= sizeof buffer)
 540                 return false;
 541
 542         buffer[blen] = '\n';
 543         blen++;
 544
 545         while(blen) {
 546                 int result = send(fd, p, blen, MSG_NOSIGNAL);
 547                 if(result == -1 && sockerrno == EINTR)
 548                         continue;
 549                 else if(result <= 0)
 550                         return false;
 551                 p += result;
 552                 blen -= result;
 553         }
 554
 555         return true;
 556 }
 557
 558 static void pcap(int fd, FILE *out, int snaplen) {
 559         sendline(fd, "%d %d %d", CONTROL, REQ_PCAP, snaplen);
 560         char data[9018];
 561
 562         struct {
 563                 uint32_t magic;
 564                 uint16_t major;
 565                 uint16_t minor;
 566                 uint32_t tz_offset;
 567                 uint32_t tz_accuracy;
 568                 uint32_t snaplen;
 569                 uint32_t ll_type;
 570         } header = {
 571                 0xa1b2c3d4,
 572                 2, 4,
 573                 0, 0,
 574                 snaplen ?: sizeof data,
 575                 1,
 576         };
 577
 578         struct {
 579                 uint32_t tv_sec;
 580                 uint32_t tv_usec;
 581                 uint32_t len;
 582                 uint32_t origlen;
 583         } packet;
 584
 585         struct timeval tv;
 586
 587         fwrite(&header, sizeof header, 1, out);
 588         fflush(out);
 589
 590         char line[32];
 591         while(recvline(fd, line, sizeof line)) {
 592                 int code, req, len;
 593                 int n = sscanf(line, "%d %d %d", &code, &req, &len);
 594                 gettimeofday(&tv, NULL);
 595                 if(n != 3 || code != CONTROL || req != REQ_PCAP || len < 0 || len > sizeof data)
 596                         break;
 597                 if(!recvdata(fd, data, len))
 598                         break;
 599                 packet.tv_sec = tv.tv_sec;
 600                 packet.tv_usec = tv.tv_usec;
 601                 packet.len = len;
 602                 packet.origlen = len;
 603                 fwrite(&packet, sizeof packet, 1, out);
 604                 fwrite(data, len, 1, out);
 605                 fflush(out);
 606         }
 607 }
 608
 609 static void logcontrol(int fd, FILE *out, int level) {
 610         sendline(fd, "%d %d %d", CONTROL, REQ_LOG, level);
 611         char data[1024];
 612         char line[32];
 613
 614         while(recvline(fd, line, sizeof line)) {
 615                 int code, req, len;
 616                 int n = sscanf(line, "%d %d %d", &code, &req, &len);
 617                 if(n != 3 || code != CONTROL || req != REQ_LOG || len < 0 || len > sizeof data)
 618                         break;
 619                 if(!recvdata(fd, data, len))
 620                         break;
 621                 fwrite(data, len, 1, out);
 622                 fputc('\n', out);
 623                 fflush(out);
 624         }
 625 }
 626
 627 #ifdef HAVE_MINGW
 628 static bool remove_service(void) {
 629         SC_HANDLE manager = NULL;
 630         SC_HANDLE service = NULL;
 631         SERVICE_STATUS status = {0};
 632
 633         manager = OpenSCManager(NULL, NULL, SC_MANAGER_ALL_ACCESS);
 634         if(!manager) {
 635                 fprintf(stderr, "Could not open service manager: %s\n", winerror(GetLastError()));
 636                 return false;
 637         }
 638
 639         service = OpenService(manager, identname, SERVICE_ALL_ACCESS);
 640
 641         if(!service) {
 642                 fprintf(stderr, "Could not open %s service: %s\n", identname, winerror(GetLastError()));
 643                 return false;
 644         }
 645
 646         if(!ControlService(service, SERVICE_CONTROL_STOP, &status))
 647                 fprintf(stderr, "Could not stop %s service: %s\n", identname, winerror(GetLastError()));
 648         else
 649                 fprintf(stderr, "%s service stopped\n", identname);
 650
 651         if(!DeleteService(service)) {
 652                 fprintf(stderr, "Could not remove %s service: %s\n", identname, winerror(GetLastError()));
 653                 return false;
 654         }
 655
 656         fprintf(stderr, "%s service removed\n", identname);
 657
 658         return true;
 659 }
 660 #endif
 661
 662 bool connect_tincd(bool verbose) {
 663         if(fd >= 0) {
 664                 fd_set r;
 665                 FD_ZERO(&r);
 666                 FD_SET(fd, &r);
 667                 struct timeval tv = {0, 0};
 668                 if(select(fd + 1, &r, NULL, NULL, &tv)) {
 669                         fprintf(stderr, "Previous connection to tincd lost, reconnecting.\n");
 670                         close(fd);
 671                         fd = -1;
 672                 } else {
 673                         return true;
 674                 }
 675         }
 676
 677         FILE *f = fopen(pidfilename, "r");
 678         if(!f) {
 679                 if(verbose)
 680                         fprintf(stderr, "Could not open pid file %s: %s\n", pidfilename, strerror(errno));
 681                 return false;
 682         }
 683
 684         char host[129];
 685         char port[129];
 686
 687         if(fscanf(f, "%20d %1024s %128s port %128s", &pid, controlcookie, host, port) != 4) {
 688                 if(verbose)
 689                         fprintf(stderr, "Could not parse pid file %s\n", pidfilename);
 690                 fclose(f);
 691                 return false;
 692         }
 693
 694         fclose(f);
 695
 696 #ifndef HAVE_MINGW
 697         struct sockaddr_un sa;
 698         sa.sun_family = AF_UNIX;
 699         strncpy(sa.sun_path, unixsocketname, sizeof sa.sun_path);
 700
 701         fd = socket(AF_UNIX, SOCK_STREAM, 0);
 702         if(fd < 0) {
 703                 if(verbose)
 704                         fprintf(stderr, "Cannot create UNIX socket: %s\n", sockstrerror(sockerrno));
 705                 return false;
 706         }
 707
 708         if(connect(fd, (struct sockaddr *)&sa, sizeof sa) < 0) {
 709                 if(verbose)
 710                         fprintf(stderr, "Cannot connect to UNIX socket %s: %s\n", unixsocketname, sockstrerror(sockerrno));
 711                 close(fd);
 712                 fd = -1;
 713                 return false;
 714         }
 715 #else
 716         struct addrinfo hints = {
 717                 .ai_family = AF_UNSPEC,
 718                 .ai_socktype = SOCK_STREAM,
 719                 .ai_protocol = IPPROTO_TCP,
 720                 .ai_flags = 0,
 721         };
 722
 723         struct addrinfo *res = NULL;
 724
 725         if(getaddrinfo(host, port, &hints, &res) || !res) {
 726                 if(verbose)
 727                         fprintf(stderr, "Cannot resolve %s port %s: %s", host, port, sockstrerror(sockerrno));
 728                 return false;
 729         }
 730
 731         fd = socket(res->ai_family, SOCK_STREAM, IPPROTO_TCP);
 732         if(fd < 0) {
 733                 if(verbose)
 734                         fprintf(stderr, "Cannot create TCP socket: %s\n", sockstrerror(sockerrno));
 735                 return false;
 736         }
 737
 738 #ifdef HAVE_MINGW
 739         unsigned long arg = 0;
 740
 741         if(ioctlsocket(fd, FIONBIO, &arg) != 0) {
 742                 if(verbose)
 743                         fprintf(stderr, "ioctlsocket failed: %s", sockstrerror(sockerrno));
 744         }
 745 #endif
 746
 747         if(connect(fd, res->ai_addr, res->ai_addrlen) < 0) {
 748                 if(verbose)
 749                         fprintf(stderr, "Cannot connect to %s port %s: %s\n", host, port, sockstrerror(sockerrno));
 750                 close(fd);
 751                 fd = -1;
 752                 return false;
 753         }
 754
 755         freeaddrinfo(res);
 756 #endif
 757
 758 #ifdef SO_NOSIGPIPE
 759         static const int one = 1;
 760         setsockopt(c, SOL_SOCKET, SO_NOSIGPIPE, (void *)&one, sizeof one);
 761 #endif
 762
 763         char data[4096];
 764         int version;
 765
 766         if(!recvline(fd, line, sizeof line) || sscanf(line, "%d %s %d", &code, data, &version) != 3 || code != 0) {
 767                 if(verbose)
 768                         fprintf(stderr, "Cannot read greeting from control socket: %s\n", sockstrerror(sockerrno));
 769                 close(fd);
 770                 fd = -1;
 771                 return false;
 772         }
 773
 774         sendline(fd, "%d ^%s %d", ID, controlcookie, TINC_CTL_VERSION_CURRENT);
 775
 776         if(!recvline(fd, line, sizeof line) || sscanf(line, "%d %d %d", &code, &version, &pid) != 3 || code != 4 || version != TINC_CTL_VERSION_CURRENT) {
 777                 if(verbose)
 778                         fprintf(stderr, "Could not fully establish control socket connection\n");
 779                 close(fd);
 780                 fd = -1;
 781                 return false;
 782         }
 783
 784         return true;
 785 }
 786
 787
 788 static int cmd_start(int argc, char *argv[]) {
 789         if(connect_tincd(false)) {
 790                 if(netname)
 791                         fprintf(stderr, "A tincd is already running for net `%s' with pid %d.\n", netname, pid);
 792                 else
 793                         fprintf(stderr, "A tincd is already running with pid %d.\n", pid);
 794                 return 0;
 795         }
 796
 797         char *c;
 798         char *slash = strrchr(program_name, '/');
 799
 800 #ifdef HAVE_MINGW
 801         if ((c = strrchr(program_name, '\\')) > slash)
 802                 slash = c;
 803 #endif
 804
 805         if (slash++)
 806                 xasprintf(&c, "%.*stincd", (int)(slash - program_name), program_name);
 807         else
 808                 c = "tincd";
 809
 810         int nargc = 0;
 811         char **nargv = xzalloc((optind + argc) * sizeof *nargv);
 812
 813         nargv[nargc++] = c;
 814         for(int i = 1; i < optind; i++)
 815                 nargv[nargc++] = orig_argv[i];
 816         for(int i = 1; i < argc; i++)
 817                 nargv[nargc++] = argv[i];
 818
 819 #ifdef HAVE_MINGW
 820         execvp(c, nargv);
 821         fprintf(stderr, "Error starting %s: %s\n", c, strerror(errno));
 822         return 1;
 823 #else
 824         pid_t pid = fork();
 825         if(pid == -1) {
 826                 fprintf(stderr, "Could not fork: %s\n", strerror(errno));
 827                 free(nargv);
 828                 return 1;
 829         }
 830
 831         if(!pid)
 832                 exit(execvp(c, nargv));
 833
 834         free(nargv);
 835
 836         int status = -1, result;
 837 #ifdef SIGINT
 838         signal(SIGINT, SIG_IGN);
 839 #endif
 840         result = waitpid(pid, &status, 0);
 841 #ifdef SIGINT
 842         signal(SIGINT, SIG_DFL);
 843 #endif
 844
 845         if(result != pid || !WIFEXITED(status) || WEXITSTATUS(status)) {
 846                 fprintf(stderr, "Error starting %s\n", c);
 847                 return 1;
 848         }
 849
 850         return 0;
 851 #endif
 852 }
 853
 854 static int cmd_stop(int argc, char *argv[]) {
 855         if(argc > 1) {
 856                 fprintf(stderr, "Too many arguments!\n");
 857                 return 1;
 858         }
 859
 860 #ifndef HAVE_MINGW
 861         if(!connect_tincd(true)) {
 862                 if(pid) {
 863                         if(kill(pid, SIGTERM)) {
 864                                 fprintf(stderr, "Could not send TERM signal to process with PID %u: %s\n", pid, strerror(errno));
 865                                 return 1;
 866                         }
 867
 868                         fprintf(stderr, "Sent TERM signal to process with PID %u.\n", pid);
 869                         waitpid(pid, NULL, 0);
 870                         return 0;
 871                 }
 872
 873                 return 1;
 874         }
 875
 876         sendline(fd, "%d %d", CONTROL, REQ_STOP);
 877
 878         while(recvline(fd, line, sizeof line)) {
 879                 // Wait for tincd to close the connection...
 880         }
 881 #else
 882         if(!remove_service())
 883                 return 1;
 884 #endif
 885         close(fd);
 886         pid = 0;
 887         fd = -1;
 888
 889         return 0;
 890 }
 891
 892 static int cmd_restart(int argc, char *argv[]) {
 893         cmd_stop(1, argv);
 894         return cmd_start(argc, argv);
 895 }
 896
 897 static int cmd_reload(int argc, char *argv[]) {
 898         if(argc > 1) {
 899                 fprintf(stderr, "Too many arguments!\n");
 900                 return 1;
 901         }
 902
 903         if(!connect_tincd(true))
 904                 return 1;
 905
 906         sendline(fd, "%d %d", CONTROL, REQ_RELOAD);
 907         if(!recvline(fd, line, sizeof line) || sscanf(line, "%d %d %d", &code, &req, &result) != 3 || code != CONTROL || req != REQ_RELOAD || result) {
 908                 fprintf(stderr, "Could not reload configuration.\n");
 909                 return 1;
 910         }
 911
 912         return 0;
 913
 914 }
 915
 916 static int cmd_dump(int argc, char *argv[]) {
 917         bool only_reachable = false;
 918
 919         if(argc > 2 && !strcasecmp(argv[1], "reachable")) {
 920                 if(strcasecmp(argv[2], "nodes")) {
 921                         fprintf(stderr, "`reachable' only supported for nodes.\n");
 922                         usage(true);
 923                         return 1;
 924                 }
 925                 only_reachable = true;
 926                 argv++;
 927                 argc--;
 928         }
 929
 930         if(argc != 2) {
 931                 fprintf(stderr, "Invalid number of arguments.\n");
 932                 usage(true);
 933                 return 1;
 934         }
 935
 936         if(!connect_tincd(true))
 937                 return 1;
 938
 939         int do_graph = 0;
 940
 941         if(!strcasecmp(argv[1], "nodes"))
 942                 sendline(fd, "%d %d", CONTROL, REQ_DUMP_NODES);
 943         else if(!strcasecmp(argv[1], "edges"))
 944                 sendline(fd, "%d %d", CONTROL, REQ_DUMP_EDGES);
 945         else if(!strcasecmp(argv[1], "subnets"))
 946                 sendline(fd, "%d %d", CONTROL, REQ_DUMP_SUBNETS);
 947         else if(!strcasecmp(argv[1], "connections"))
 948                 sendline(fd, "%d %d", CONTROL, REQ_DUMP_CONNECTIONS);
 949         else if(!strcasecmp(argv[1], "graph")) {
 950                 sendline(fd, "%d %d", CONTROL, REQ_DUMP_NODES);
 951                 sendline(fd, "%d %d", CONTROL, REQ_DUMP_EDGES);
 952                 do_graph = 1;
 953         } else if(!strcasecmp(argv[1], "digraph")) {
 954                 sendline(fd, "%d %d", CONTROL, REQ_DUMP_NODES);
 955                 sendline(fd, "%d %d", CONTROL, REQ_DUMP_EDGES);
 956                 do_graph = 2;
 957         } else {
 958                 fprintf(stderr, "Unknown dump type '%s'.\n", argv[1]);
 959                 usage(true);
 960                 return 1;
 961         }
 962
 963         if(do_graph == 1)
 964                 printf("graph {\n");
 965         else if(do_graph == 2)
 966                 printf("digraph {\n");
 967
 968         while(recvline(fd, line, sizeof line)) {
 969                 char node1[4096], node2[4096];
 970                 int n = sscanf(line, "%d %d %s %s", &code, &req, node1, node2);
 971                 if(n == 2) {
 972                         if(do_graph && req == REQ_DUMP_NODES)
 973                                 continue;
 974                         else {
 975                                 if(do_graph)
 976                                         printf("}\n");
 977                                 return 0;
 978                         }
 979                 }
 980                 if(n < 2)
 981                         break;
 982
 983                 char node[4096];
 984                 char from[4096];
 985                 char to[4096];
 986                 char subnet[4096];
 987                 char host[4096];
 988                 char port[4096];
 989                 char local_host[4096];
 990                 char local_port[4096];
 991                 char via[4096];
 992                 char nexthop[4096];
 993                 int cipher, digest, maclength, compression, distance, socket, weight;
 994                 short int pmtu, minmtu, maxmtu;
 995                 unsigned int options, status_int;
 996                 node_status_t status;
 997                 long int last_state_change;
 998
 999                 switch(req) {
1000                         case REQ_DUMP_NODES: {
1001                                 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);
1002                                 if(n != 16) {
1003                                         fprintf(stderr, "Unable to parse node dump from tincd: %s\n", line);
1004                                         return 1;
1005                                 }
1006
1007                                 memcpy(&status, &status_int, sizeof status);
1008
1009                                 if(do_graph) {
1010                                         const char *color = "black";
1011                                         if(!strcmp(host, "MYSELF"))
1012                                                 color = "green";
1013                                         else if(!status.reachable)
1014                                                 color = "red";
1015                                         else if(strcmp(via, node))
1016                                                 color = "orange";
1017                                         else if(!status.validkey)
1018                                                 color = "black";
1019                                         else if(minmtu > 0)
1020                                                 color = "green";
1021                                         printf(" %s [label = \"%s\", color = \"%s\"%s];\n", node, node, color, strcmp(host, "MYSELF") ? "" : ", style = \"filled\"");
1022                                 } else {
1023                                         if(only_reachable && !status.reachable)
1024                                                 continue;
1025                                         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",
1026                                                         node, host, port, cipher, digest, maclength, compression, options, status_int, nexthop, via, distance, pmtu, minmtu, maxmtu);
1027                                 }
1028                         } break;
1029
1030                         case REQ_DUMP_EDGES: {
1031                                 int n = sscanf(line, "%*d %*d %s %s %s port %s %s port %s %x %d", from, to, host, port, local_host, local_port, &options, &weight);
1032                                 if(n != 8) {
1033                                         fprintf(stderr, "Unable to parse edge dump from tincd.\n");
1034                                         return 1;
1035                                 }
1036
1037                                 if(do_graph) {
1038                                         float w = 1 + 65536.0 / weight;
1039                                         if(do_graph == 1 && strcmp(node1, node2) > 0)
1040                                                 printf(" %s -- %s [w = %f, weight = %f];\n", node1, node2, w, w);
1041                                         else if(do_graph == 2)
1042                                                 printf(" %s -> %s [w = %f, weight = %f];\n", node1, node2, w, w);
1043                                 } else {
1044                                         printf("%s to %s at %s port %s local %s port %s options %x weight %d\n", from, to, host, port, local_host, local_port, options, weight);
1045                                 }
1046                         } break;
1047
1048                         case REQ_DUMP_SUBNETS: {
1049                                 int n = sscanf(line, "%*d %*d %s %s", subnet, node);
1050                                 if(n != 2) {
1051                                         fprintf(stderr, "Unable to parse subnet dump from tincd.\n");
1052                                         return 1;
1053                                 }
1054                                 printf("%s owner %s\n", strip_weight(subnet), node);
1055                         } break;
1056
1057                         case REQ_DUMP_CONNECTIONS: {
1058                                 int n = sscanf(line, "%*d %*d %s %s port %s %x %d %x", node, host, port, &options, &socket, &status_int);
1059                                 if(n != 6) {
1060                                         fprintf(stderr, "Unable to parse connection dump from tincd.\n");
1061                                         return 1;
1062                                 }
1063                                 printf("%s at %s port %s options %x socket %d status %x\n", node, host, port, options, socket, status_int);
1064                         } break;
1065
1066                         default:
1067                                 fprintf(stderr, "Unable to parse dump from tincd.\n");
1068                                 return 1;
1069                 }
1070         }
1071
1072         fprintf(stderr, "Error receiving dump.\n");
1073         return 1;
1074 }
1075
1076 static int cmd_purge(int argc, char *argv[]) {
1077         if(argc > 1) {
1078                 fprintf(stderr, "Too many arguments!\n");
1079                 return 1;
1080         }
1081
1082         if(!connect_tincd(true))
1083                 return 1;
1084
1085         sendline(fd, "%d %d", CONTROL, REQ_PURGE);
1086         if(!recvline(fd, line, sizeof line) || sscanf(line, "%d %d %d", &code, &req, &result) != 3 || code != CONTROL || req != REQ_PURGE || result) {
1087                 fprintf(stderr, "Could not purge old information.\n");
1088                 return 1;
1089         }
1090
1091         return 0;
1092 }
1093
1094 static int cmd_debug(int argc, char *argv[]) {
1095         if(argc != 2) {
1096                 fprintf(stderr, "Invalid number of arguments.\n");
1097                 return 1;
1098         }
1099
1100         if(!connect_tincd(true))
1101                 return 1;
1102
1103         int debuglevel = atoi(argv[1]);
1104         int origlevel;
1105
1106         sendline(fd, "%d %d %d", CONTROL, REQ_SET_DEBUG, debuglevel);
1107         if(!recvline(fd, line, sizeof line) || sscanf(line, "%d %d %d", &code, &req, &origlevel) != 3 || code != CONTROL || req != REQ_SET_DEBUG) {
1108                 fprintf(stderr, "Could not set debug level.\n");
1109                 return 1;
1110         }
1111
1112         fprintf(stderr, "Old level %d, new level %d.\n", origlevel, debuglevel);
1113         return 0;
1114 }
1115
1116 static int cmd_retry(int argc, char *argv[]) {
1117         if(argc > 1) {
1118                 fprintf(stderr, "Too many arguments!\n");
1119                 return 1;
1120         }
1121
1122         if(!connect_tincd(true))
1123                 return 1;
1124
1125         sendline(fd, "%d %d", CONTROL, REQ_RETRY);
1126         if(!recvline(fd, line, sizeof line) || sscanf(line, "%d %d %d", &code, &req, &result) != 3 || code != CONTROL || req != REQ_RETRY || result) {
1127                 fprintf(stderr, "Could not retry outgoing connections.\n");
1128                 return 1;
1129         }
1130
1131         return 0;
1132 }
1133
1134 static int cmd_connect(int argc, char *argv[]) {
1135         if(argc != 2) {
1136                 fprintf(stderr, "Invalid number of arguments.\n");
1137                 return 1;
1138         }
1139
1140         if(!check_id(argv[1])) {
1141                 fprintf(stderr, "Invalid name for node.\n");
1142                 return 1;
1143         }
1144
1145         if(!connect_tincd(true))
1146                 return 1;
1147
1148         sendline(fd, "%d %d %s", CONTROL, REQ_CONNECT, argv[1]);
1149         if(!recvline(fd, line, sizeof line) || sscanf(line, "%d %d %d", &code, &req, &result) != 3 || code != CONTROL || req != REQ_CONNECT || result) {
1150                 fprintf(stderr, "Could not connect to %s.\n", argv[1]);
1151                 return 1;
1152         }
1153
1154         return 0;
1155 }
1156
1157 static int cmd_disconnect(int argc, char *argv[]) {
1158         if(argc != 2) {
1159                 fprintf(stderr, "Invalid number of arguments.\n");
1160                 return 1;
1161         }
1162
1163         if(!check_id(argv[1])) {
1164                 fprintf(stderr, "Invalid name for node.\n");
1165                 return 1;
1166         }
1167
1168         if(!connect_tincd(true))
1169                 return 1;
1170
1171         sendline(fd, "%d %d %s", CONTROL, REQ_DISCONNECT, argv[1]);
1172         if(!recvline(fd, line, sizeof line) || sscanf(line, "%d %d %d", &code, &req, &result) != 3 || code != CONTROL || req != REQ_DISCONNECT || result) {
1173                 fprintf(stderr, "Could not disconnect %s.\n", argv[1]);
1174                 return 1;
1175         }
1176
1177         return 0;
1178 }
1179
1180 static int cmd_top(int argc, char *argv[]) {
1181         if(argc > 1) {
1182                 fprintf(stderr, "Too many arguments!\n");
1183                 return 1;
1184         }
1185
1186 #ifdef HAVE_CURSES
1187         if(!connect_tincd(true))
1188                 return 1;
1189
1190         top(fd);
1191         return 0;
1192 #else
1193         fprintf(stderr, "This version of tinc was compiled without support for the curses library.\n");
1194         return 1;
1195 #endif
1196 }
1197
1198 static int cmd_pcap(int argc, char *argv[]) {
1199         if(argc > 2) {
1200                 fprintf(stderr, "Too many arguments!\n");
1201                 return 1;
1202         }
1203
1204         if(!connect_tincd(true))
1205                 return 1;
1206
1207         pcap(fd, stdout, argc > 1 ? atoi(argv[1]) : 0);
1208         return 0;
1209 }
1210
1211 #ifdef SIGINT
1212 static void sigint_handler(int sig) {
1213         fprintf(stderr, "\n");
1214         shutdown(fd, SHUT_RDWR);
1215 }
1216 #endif
1217
1218 static int cmd_log(int argc, char *argv[]) {
1219         if(argc > 2) {
1220                 fprintf(stderr, "Too many arguments!\n");
1221                 return 1;
1222         }
1223
1224         if(!connect_tincd(true))
1225                 return 1;
1226
1227 #ifdef SIGINT
1228         signal(SIGINT, sigint_handler);
1229 #endif
1230
1231         logcontrol(fd, stdout, argc > 1 ? atoi(argv[1]) : -1);
1232
1233 #ifdef SIGINT
1234         signal(SIGINT, SIG_DFL);
1235 #endif
1236
1237         close(fd);
1238         fd = -1;
1239         return 0;
1240 }
1241
1242 static int cmd_pid(int argc, char *argv[]) {
1243         if(argc > 1) {
1244                 fprintf(stderr, "Too many arguments!\n");
1245                 return 1;
1246         }
1247
1248         if(!connect_tincd(true) && !pid)
1249                 return 1;
1250
1251         printf("%d\n", pid);
1252         return 0;
1253 }
1254
1255 int rstrip(char *value) {
1256         int len = strlen(value);
1257         while(len && strchr("\t\r\n ", value[len - 1]))
1258                 value[--len] = 0;
1259         return len;
1260 }
1261
1262 char *get_my_name(bool verbose) {
1263         FILE *f = fopen(tinc_conf, "r");
1264         if(!f) {
1265                 if(verbose)
1266                         fprintf(stderr, "Could not open %s: %s\n", tinc_conf, strerror(errno));
1267                 return NULL;
1268         }
1269
1270         char buf[4096];
1271         char *value;
1272         while(fgets(buf, sizeof buf, f)) {
1273                 int len = strcspn(buf, "\t =");
1274                 value = buf + len;
1275                 value += strspn(value, "\t ");
1276                 if(*value == '=') {
1277                         value++;
1278                         value += strspn(value, "\t ");
1279                 }
1280                 if(!rstrip(value))
1281                         continue;
1282                 buf[len] = 0;
1283                 if(strcasecmp(buf, "Name"))
1284                         continue;
1285                 if(*value) {
1286                         fclose(f);
1287                         return strdup(value);
1288                 }
1289         }
1290
1291         fclose(f);
1292         if(verbose)
1293                 fprintf(stderr, "Could not find Name in %s.\n", tinc_conf);
1294         return NULL;
1295 }
1296
1297 const var_t variables[] = {
1298         /* Server configuration */
1299         {"AddressFamily", VAR_SERVER},
1300         {"AutoConnect", VAR_SERVER | VAR_SAFE},
1301         {"BindToAddress", VAR_SERVER | VAR_MULTIPLE},
1302         {"BindToInterface", VAR_SERVER},
1303         {"Broadcast", VAR_SERVER | VAR_SAFE},
1304         {"ConnectTo", VAR_SERVER | VAR_MULTIPLE | VAR_SAFE},
1305         {"DecrementTTL", VAR_SERVER},
1306         {"Device", VAR_SERVER},
1307         {"DeviceType", VAR_SERVER},
1308         {"DirectOnly", VAR_SERVER},
1309         {"Ed25519PrivateKeyFile", VAR_SERVER},
1310         {"ExperimentalProtocol", VAR_SERVER},
1311         {"Forwarding", VAR_SERVER},
1312         {"GraphDumpFile", VAR_SERVER | VAR_OBSOLETE},
1313         {"Hostnames", VAR_SERVER},
1314         {"IffOneQueue", VAR_SERVER},
1315         {"Interface", VAR_SERVER},
1316         {"KeyExpire", VAR_SERVER},
1317         {"ListenAddress", VAR_SERVER | VAR_MULTIPLE},
1318         {"LocalDiscovery", VAR_SERVER},
1319         {"MACExpire", VAR_SERVER},
1320         {"MaxConnectionBurst", VAR_SERVER},
1321         {"MaxOutputBufferSize", VAR_SERVER},
1322         {"MaxTimeout", VAR_SERVER},
1323         {"Mode", VAR_SERVER | VAR_SAFE},
1324         {"Name", VAR_SERVER},
1325         {"PingInterval", VAR_SERVER},
1326         {"PingTimeout", VAR_SERVER},
1327         {"PriorityInheritance", VAR_SERVER},
1328         {"PrivateKey", VAR_SERVER | VAR_OBSOLETE},
1329         {"PrivateKeyFile", VAR_SERVER},
1330         {"ProcessPriority", VAR_SERVER},
1331         {"Proxy", VAR_SERVER},
1332         {"ReplayWindow", VAR_SERVER},
1333         {"ScriptsExtension", VAR_SERVER},
1334         {"ScriptsInterpreter", VAR_SERVER},
1335         {"StrictSubnets", VAR_SERVER},
1336         {"TunnelServer", VAR_SERVER},
1337         {"UDPRcvBuf", VAR_SERVER},
1338         {"UDPSndBuf", VAR_SERVER},
1339         {"VDEGroup", VAR_SERVER},
1340         {"VDEPort", VAR_SERVER},
1341         /* Host configuration */
1342         {"Address", VAR_HOST | VAR_MULTIPLE},
1343         {"Cipher", VAR_SERVER | VAR_HOST},
1344         {"ClampMSS", VAR_SERVER | VAR_HOST},
1345         {"Compression", VAR_SERVER | VAR_HOST},
1346         {"Digest", VAR_SERVER | VAR_HOST},
1347         {"Ed25519PublicKey", VAR_HOST},
1348         {"Ed25519PublicKeyFile", VAR_SERVER | VAR_HOST},
1349         {"IndirectData", VAR_SERVER | VAR_HOST},
1350         {"MACLength", VAR_SERVER | VAR_HOST},
1351         {"PMTU", VAR_SERVER | VAR_HOST},
1352         {"PMTUDiscovery", VAR_SERVER | VAR_HOST},
1353         {"Port", VAR_HOST},
1354         {"PublicKey", VAR_HOST | VAR_OBSOLETE},
1355         {"PublicKeyFile", VAR_SERVER | VAR_HOST | VAR_OBSOLETE},
1356         {"Subnet", VAR_HOST | VAR_MULTIPLE | VAR_SAFE},
1357         {"TCPOnly", VAR_SERVER | VAR_HOST},
1358         {"Weight", VAR_HOST | VAR_SAFE},
1359         {NULL, 0}
1360 };
1361
1362 static int cmd_config(int argc, char *argv[]) {
1363         if(argc < 2) {
1364                 fprintf(stderr, "Invalid number of arguments.\n");
1365                 return 1;
1366         }
1367
1368         if(strcasecmp(argv[0], "config"))
1369                 argv--, argc++;
1370
1371         int action = -2;
1372         if(!strcasecmp(argv[1], "get")) {
1373                 argv++, argc--;
1374         } else if(!strcasecmp(argv[1], "add")) {
1375                 argv++, argc--, action = 1;
1376         } else if(!strcasecmp(argv[1], "del")) {
1377                 argv++, argc--, action = -1;
1378         } else if(!strcasecmp(argv[1], "replace") || !strcasecmp(argv[1], "set") || !strcasecmp(argv[1], "change")) {
1379                 argv++, argc--, action = 0;
1380         }
1381
1382         if(argc < 2) {
1383                 fprintf(stderr, "Invalid number of arguments.\n");
1384                 return 1;
1385         }
1386
1387         // Concatenate the rest of the command line
1388         strncpy(line, argv[1], sizeof line - 1);
1389         for(int i = 2; i < argc; i++) {
1390                 strncat(line, " ", sizeof line - 1 - strlen(line));
1391                 strncat(line, argv[i], sizeof line - 1 - strlen(line));
1392         }
1393
1394         // Liberal parsing into node name, variable name and value.
1395         char *node = NULL;
1396         char *variable;
1397         char *value;
1398         int len;
1399
1400         len = strcspn(line, "\t =");
1401         value = line + len;
1402         value += strspn(value, "\t ");
1403         if(*value == '=') {
1404                 value++;
1405                 value += strspn(value, "\t ");
1406         }
1407         line[len] = '\0';
1408         variable = strchr(line, '.');
1409         if(variable) {
1410                 node = line;
1411                 *variable++ = 0;
1412         } else {
1413                 variable = line;
1414         }
1415
1416         if(!*variable) {
1417                 fprintf(stderr, "No variable given.\n");
1418                 return 1;
1419         }
1420
1421         if(action >= 0 && !*value) {
1422                 fprintf(stderr, "No value for variable given.\n");
1423                 return 1;
1424         }
1425
1426         if(action < -1 && *value)
1427                 action = 0;
1428
1429         /* Some simple checks. */
1430         bool found = false;
1431         bool warnonremove = false;
1432
1433         for(int i = 0; variables[i].name; i++) {
1434                 if(strcasecmp(variables[i].name, variable))
1435                         continue;
1436
1437                 found = true;
1438                 variable = (char *)variables[i].name;
1439
1440                 /* Discourage use of obsolete variables. */
1441
1442                 if(variables[i].type & VAR_OBSOLETE && action >= 0) {
1443                         if(force) {
1444                                 fprintf(stderr, "Warning: %s is an obsolete variable!\n", variable);
1445                         } else {
1446                                 fprintf(stderr, "%s is an obsolete variable! Use --force to use it anyway.\n", variable);
1447                                 return 1;
1448                         }
1449                 }
1450
1451                 /* Don't put server variables in host config files */
1452
1453                 if(node && !(variables[i].type & VAR_HOST) && action >= 0) {
1454                         if(force) {
1455                                 fprintf(stderr, "Warning: %s is not a host configuration variable!\n", variable);
1456                         } else {
1457                                 fprintf(stderr, "%s is not a host configuration variable! Use --force to use it anyway.\n", variable);
1458                                 return 1;
1459                         }
1460                 }
1461
1462                 /* Should this go into our own host config file? */
1463
1464                 if(!node && !(variables[i].type & VAR_SERVER)) {
1465                         node = get_my_name(true);
1466                         if(!node)
1467                                 return 1;
1468                 }
1469
1470                 /* Change "add" into "set" for variables that do not allow multiple occurences.
1471                    Turn on warnings when it seems variables might be removed unintentionally. */
1472
1473                 if(action == 1 && !(variables[i].type & VAR_MULTIPLE)) {
1474                         warnonremove = true;
1475                         action = 0;
1476                 } else if(action == 0 && (variables[i].type & VAR_MULTIPLE)) {
1477                         warnonremove = true;
1478                 }
1479
1480                 break;
1481         }
1482
1483         if(node && !check_id(node)) {
1484                 fprintf(stderr, "Invalid name for node.\n");
1485                 return 1;
1486         }
1487
1488         if(!found) {
1489                 if(force || action < 0) {
1490                         fprintf(stderr, "Warning: %s is not a known configuration variable!\n", variable);
1491                 } else {
1492                         fprintf(stderr, "%s: is not a known configuration variable! Use --force to use it anyway.\n", variable);
1493                         return 1;
1494                 }
1495         }
1496
1497         // Open the right configuration file.
1498         char *filename;
1499         if(node)
1500                 xasprintf(&filename, "%s" SLASH "%s", hosts_dir, node);
1501         else
1502                 filename = tinc_conf;
1503
1504         FILE *f = fopen(filename, "r");
1505         if(!f) {
1506                 fprintf(stderr, "Could not open configuration file %s: %s\n", filename, strerror(errno));
1507                 return 1;
1508         }
1509
1510         char *tmpfile = NULL;
1511         FILE *tf = NULL;
1512
1513         if(action >= -1) {
1514                 xasprintf(&tmpfile, "%s.config.tmp", filename);
1515                 tf = fopen(tmpfile, "w");
1516                 if(!tf) {
1517                         fprintf(stderr, "Could not open temporary file %s: %s\n", tmpfile, strerror(errno));
1518                         fclose(f);
1519                         return 1;
1520                 }
1521         }
1522
1523         // Copy the file, making modifications on the fly, unless we are just getting a value.
1524         char buf1[4096];
1525         char buf2[4096];
1526         bool set = false;
1527         bool removed = false;
1528         found = false;
1529
1530         while(fgets(buf1, sizeof buf1, f)) {
1531                 buf1[sizeof buf1 - 1] = 0;
1532                 strncpy(buf2, buf1, sizeof buf2);
1533
1534                 // Parse line in a simple way
1535                 char *bvalue;
1536                 int len;
1537
1538                 len = strcspn(buf2, "\t =");
1539                 bvalue = buf2 + len;
1540                 bvalue += strspn(bvalue, "\t ");
1541                 if(*bvalue == '=') {
1542                         bvalue++;
1543                         bvalue += strspn(bvalue, "\t ");
1544                 }
1545                 rstrip(bvalue);
1546                 buf2[len] = '\0';
1547
1548                 // Did it match?
1549                 if(!strcasecmp(buf2, variable)) {
1550                         // Get
1551                         if(action < -1) {
1552                                 found = true;
1553                                 printf("%s\n", bvalue);
1554                         // Del
1555                         } else if(action == -1) {
1556                                 if(!*value || !strcasecmp(bvalue, value)) {
1557                                         removed = true;
1558                                         continue;
1559                                 }
1560                         // Set
1561                         } else if(action == 0) {
1562                                 // Warn if "set" was used for variables that can occur multiple times
1563                                 if(warnonremove && strcasecmp(bvalue, value))
1564                                         fprintf(stderr, "Warning: removing %s = %s\n", variable, bvalue);
1565
1566                                 // Already set? Delete the rest...
1567                                 if(set)
1568                                         continue;
1569
1570                                 // Otherwise, replace.
1571                                 if(fprintf(tf, "%s = %s\n", variable, value) < 0) {
1572                                         fprintf(stderr, "Error writing to temporary file %s: %s\n", tmpfile, strerror(errno));
1573                                         return 1;
1574                                 }
1575                                 set = true;
1576                                 continue;
1577                         }
1578                 }
1579
1580                 if(action >= -1) {
1581                         // Copy original line...
1582                         if(fputs(buf1, tf) < 0) {
1583                                 fprintf(stderr, "Error writing to temporary file %s: %s\n", tmpfile, strerror(errno));
1584                                 return 1;
1585                         }
1586
1587                         // Add newline if it is missing...
1588                         if(*buf1 && buf1[strlen(buf1) - 1] != '\n') {
1589                                 if(fputc('\n', tf) < 0) {
1590                                         fprintf(stderr, "Error writing to temporary file %s: %s\n", tmpfile, strerror(errno));
1591                                         return 1;
1592                                 }
1593                         }
1594                 }
1595         }
1596
1597         // Make sure we read everything...
1598         if(ferror(f) || !feof(f)) {
1599                 fprintf(stderr, "Error while reading from configuration file %s: %s\n", filename, strerror(errno));
1600                 return 1;
1601         }
1602
1603         if(fclose(f)) {
1604                 fprintf(stderr, "Error closing configuration file %s: %s\n", filename, strerror(errno));
1605                 return 1;
1606         }
1607
1608         // Add new variable if necessary.
1609         if(action > 0 || (action == 0 && !set)) {
1610                 if(fprintf(tf, "%s = %s\n", variable, value) < 0) {
1611                         fprintf(stderr, "Error writing to temporary file %s: %s\n", tmpfile, strerror(errno));
1612                         return 1;
1613                 }
1614         }
1615
1616         if(action < -1) {
1617                 if(!found)
1618                         fprintf(stderr, "No matching configuration variables found.\n");
1619                 return 1;
1620         }
1621
1622         // Make sure we wrote everything...
1623         if(fclose(tf)) {
1624                 fprintf(stderr, "Error closing temporary file %s: %s\n", tmpfile, strerror(errno));
1625                 return 1;
1626         }
1627
1628         // Could we find what we had to remove?
1629         if(action < 0 && !removed) {
1630                 remove(tmpfile);
1631                 fprintf(stderr, "No configuration variables deleted.\n");
1632                 return 1;
1633         }
1634
1635         // Replace the configuration file with the new one
1636 #ifdef HAVE_MINGW
1637         if(remove(filename)) {
1638                 fprintf(stderr, "Error replacing file %s: %s\n", filename, strerror(errno));
1639                 return 1;
1640         }
1641 #endif
1642         if(rename(tmpfile, filename)) {
1643                 fprintf(stderr, "Error renaming temporary file %s to configuration file %s: %s\n", tmpfile, filename, strerror(errno));
1644                 return 1;
1645         }
1646
1647         // Silently try notifying a running tincd of changes.
1648         if(connect_tincd(false))
1649                 sendline(fd, "%d %d", CONTROL, REQ_RELOAD);
1650
1651         return 0;
1652 }
1653
1654 bool check_id(const char *name) {
1655         if(!name || !*name)
1656                 return false;
1657
1658         for(int i = 0; i < strlen(name); i++) {
1659                 if(!isalnum(name[i]) && name[i] != '_')
1660                         return false;
1661         }
1662
1663         return true;
1664 }
1665
1666 static bool try_bind(int port) {
1667         struct addrinfo *ai = NULL;
1668         struct addrinfo hint = {
1669                 .ai_flags = AI_PASSIVE,
1670                 .ai_family = AF_UNSPEC,
1671                 .ai_socktype = SOCK_STREAM,
1672                 .ai_protocol = IPPROTO_TCP,
1673         };
1674
1675         char portstr[16];
1676         snprintf(portstr, sizeof portstr, "%d", port);
1677
1678         if(getaddrinfo(NULL, portstr, &hint, &ai) || !ai)
1679                 return false;
1680
1681         while(ai) {
1682                 int fd = socket(ai->ai_family, SOCK_STREAM, IPPROTO_TCP);
1683                 if(!fd)
1684                         return false;
1685                 int result = bind(fd, ai->ai_addr, ai->ai_addrlen);
1686                 closesocket(fd);
1687                 if(result)
1688                         return false;
1689                 ai = ai->ai_next;
1690         }
1691
1692         return true;
1693 }
1694
1695 int check_port(char *name) {
1696         if(try_bind(655))
1697                 return 655;
1698
1699         fprintf(stderr, "Warning: could not bind to port 655. ");
1700
1701         for(int i = 0; i < 100; i++) {
1702                 int port = 0x1000 + (rand() & 0x7fff);
1703                 if(try_bind(port)) {
1704                         char *filename;
1705                         xasprintf(&filename, "%s" SLASH "hosts" SLASH "%s", confbase, name);
1706                         FILE *f = fopen(filename, "a");
1707                         free(filename);
1708                         if(!f) {
1709                                 fprintf(stderr, "Please change tinc's Port manually.\n");
1710                                 return 0;
1711                         }
1712
1713                         fprintf(f, "Port = %d\n", port);
1714                         fclose(f);
1715                         fprintf(stderr, "Tinc will instead listen on port %d.\n", port);
1716                         return port;
1717                 }
1718         }
1719
1720         fprintf(stderr, "Please change tinc's Port manually.\n");
1721         return 0;
1722 }
1723
1724 static int cmd_init(int argc, char *argv[]) {
1725         if(!access(tinc_conf, F_OK)) {
1726                 fprintf(stderr, "Configuration file %s already exists!\n", tinc_conf);
1727                 return 1;
1728         }
1729
1730         if(argc > 2) {
1731                 fprintf(stderr, "Too many arguments!\n");
1732                 return 1;
1733         } else if(argc < 2) {
1734                 if(tty) {
1735                         char buf[1024];
1736                         fprintf(stderr, "Enter the Name you want your tinc node to have: ");
1737                         if(!fgets(buf, sizeof buf, stdin)) {
1738                                 fprintf(stderr, "Error while reading stdin: %s\n", strerror(errno));
1739                                 return 1;
1740                         }
1741                         int len = rstrip(buf);
1742                         if(!len) {
1743                                 fprintf(stderr, "No name given!\n");
1744                                 return 1;
1745                         }
1746                         name = strdup(buf);
1747                 } else {
1748                         fprintf(stderr, "No Name given!\n");
1749                         return 1;
1750                 }
1751         } else {
1752                 name = strdup(argv[1]);
1753                 if(!*name) {
1754                         fprintf(stderr, "No Name given!\n");
1755                         return 1;
1756                 }
1757         }
1758
1759         if(!check_id(name)) {
1760                 fprintf(stderr, "Invalid Name! Only a-z, A-Z, 0-9 and _ are allowed characters.\n");
1761                 return 1;
1762         }
1763
1764         if(!confbase_given && mkdir(confdir, 0755) && errno != EEXIST) {
1765                 fprintf(stderr, "Could not create directory %s: %s\n", confdir, strerror(errno));
1766                 return 1;
1767         }
1768
1769         if(mkdir(confbase, 0777) && errno != EEXIST) {
1770                 fprintf(stderr, "Could not create directory %s: %s\n", confbase, strerror(errno));
1771                 return 1;
1772         }
1773
1774         if(mkdir(hosts_dir, 0777) && errno != EEXIST) {
1775                 fprintf(stderr, "Could not create directory %s: %s\n", hosts_dir, strerror(errno));
1776                 return 1;
1777         }
1778
1779         FILE *f = fopen(tinc_conf, "w");
1780         if(!f) {
1781                 fprintf(stderr, "Could not create file %s: %s\n", tinc_conf, strerror(errno));
1782                 return 1;
1783         }
1784
1785         fprintf(f, "Name = %s\n", name);
1786         fclose(f);
1787
1788         if(!rsa_keygen(2048, false) || !ed25519_keygen(false))
1789                 return 1;
1790
1791         check_port(name);
1792
1793 #ifndef HAVE_MINGW
1794         char *filename;
1795         xasprintf(&filename, "%s" SLASH "tinc-up", confbase);
1796         if(access(filename, F_OK)) {
1797                 FILE *f = fopenmask(filename, "w", 0777);
1798                 if(!f) {
1799                         fprintf(stderr, "Could not create file %s: %s\n", filename, strerror(errno));
1800                         return 1;
1801                 }
1802                 fprintf(f, "#!/bin/sh\n\necho 'Unconfigured tinc-up script, please edit '$0'!'\n\n#ifconfig $INTERFACE <your vpn IP address> netmask <netmask of whole VPN>\n");
1803                 fclose(f);
1804         }
1805 #endif
1806
1807         return 0;
1808
1809 }
1810
1811 static int cmd_generate_keys(int argc, char *argv[]) {
1812         if(argc > 2) {
1813                 fprintf(stderr, "Too many arguments!\n");
1814                 return 1;
1815         }
1816
1817         if(!name)
1818                 name = get_my_name(false);
1819
1820         return !(rsa_keygen(argc > 1 ? atoi(argv[1]) : 2048, true) && ed25519_keygen(true));
1821 }
1822
1823 static int cmd_generate_rsa_keys(int argc, char *argv[]) {
1824         if(argc > 2) {
1825                 fprintf(stderr, "Too many arguments!\n");
1826                 return 1;
1827         }
1828
1829         if(!name)
1830                 name = get_my_name(false);
1831
1832         return !rsa_keygen(argc > 1 ? atoi(argv[1]) : 2048, true);
1833 }
1834
1835 static int cmd_generate_ed25519_keys(int argc, char *argv[]) {
1836         if(argc > 1) {
1837                 fprintf(stderr, "Too many arguments!\n");
1838                 return 1;
1839         }
1840
1841         if(!name)
1842                 name = get_my_name(false);
1843
1844         return !ed25519_keygen(true);
1845 }
1846
1847 static int cmd_help(int argc, char *argv[]) {
1848         usage(false);
1849         return 0;
1850 }
1851
1852 static int cmd_version(int argc, char *argv[]) {
1853         if(argc > 1) {
1854                 fprintf(stderr, "Too many arguments!\n");
1855                 return 1;
1856         }
1857
1858         version();
1859         return 0;
1860 }
1861
1862 static int cmd_info(int argc, char *argv[]) {
1863         if(argc != 2) {
1864                 fprintf(stderr, "Invalid number of arguments.\n");
1865                 return 1;
1866         }
1867
1868         if(!connect_tincd(true))
1869                 return 1;
1870
1871         return info(fd, argv[1]);
1872 }
1873
1874 static const char *conffiles[] = {
1875         "tinc.conf",
1876         "tinc-up",
1877         "tinc-down",
1878         "subnet-up",
1879         "subnet-down",
1880         "host-up",
1881         "host-down",
1882         NULL,
1883 };
1884
1885 static int cmd_edit(int argc, char *argv[]) {
1886         if(argc != 2) {
1887                 fprintf(stderr, "Invalid number of arguments.\n");
1888                 return 1;
1889         }
1890
1891         char *filename = NULL;
1892
1893         if(strncmp(argv[1], "hosts" SLASH, 6)) {
1894                 for(int i = 0; conffiles[i]; i++) {
1895                         if(!strcmp(argv[1], conffiles[i])) {
1896                                 xasprintf(&filename, "%s" SLASH "%s", confbase, argv[1]);
1897                                 break;
1898                         }
1899                 }
1900         } else {
1901                 argv[1] += 6;
1902         }
1903
1904         if(!filename) {
1905                 xasprintf(&filename, "%s" SLASH "%s", hosts_dir, argv[1]);
1906                 char *dash = strchr(argv[1], '-');
1907                 if(dash) {
1908                         *dash++ = 0;
1909                         if((strcmp(dash, "up") && strcmp(dash, "down")) || !check_id(argv[1])) {
1910                                 fprintf(stderr, "Invalid configuration filename.\n");
1911                                 return 1;
1912                         }
1913                 }
1914         }
1915
1916         char *command;
1917 #ifndef HAVE_MINGW
1918         xasprintf(&command, "\"%s\" \"%s\"", getenv("VISUAL") ?: getenv("EDITOR") ?: "vi", filename);
1919 #else
1920         xasprintf(&command, "edit \"%s\"", filename);
1921 #endif
1922         int result = system(command);
1923         if(result)
1924                 return result;
1925
1926         // Silently try notifying a running tincd of changes.
1927         if(connect_tincd(false))
1928                 sendline(fd, "%d %d", CONTROL, REQ_RELOAD);
1929
1930         return 0;
1931 }
1932
1933 static int export(const char *name, FILE *out) {
1934         char *filename;
1935         xasprintf(&filename, "%s" SLASH "%s", hosts_dir, name);
1936         FILE *in = fopen(filename, "r");
1937         if(!in) {
1938                 fprintf(stderr, "Could not open configuration file %s: %s\n", filename, strerror(errno));
1939                 return 1;
1940         }
1941
1942         fprintf(out, "Name = %s\n", name);
1943         char buf[4096];
1944         while(fgets(buf, sizeof buf, in)) {
1945                 if(strcspn(buf, "\t =") != 4 || strncasecmp(buf, "Name", 4))
1946                         fputs(buf, out);
1947         }
1948
1949         if(ferror(in)) {
1950                 fprintf(stderr, "Error while reading configuration file %s: %s\n", filename, strerror(errno));
1951                 fclose(in);
1952                 return 1;
1953         }
1954
1955         fclose(in);
1956         return 0;
1957 }
1958
1959 static int cmd_export(int argc, char *argv[]) {
1960         if(argc > 1) {
1961                 fprintf(stderr, "Too many arguments!\n");
1962                 return 1;
1963         }
1964
1965         char *name = get_my_name(true);
1966         if(!name)
1967                 return 1;
1968
1969         int result = export(name, stdout);
1970         if(!tty)
1971                 fclose(stdout);
1972
1973         free(name);
1974         return result;
1975 }
1976
1977 static int cmd_export_all(int argc, char *argv[]) {
1978         if(argc > 1) {
1979                 fprintf(stderr, "Too many arguments!\n");
1980                 return 1;
1981         }
1982
1983         DIR *dir = opendir(hosts_dir);
1984         if(!dir) {
1985                 fprintf(stderr, "Could not open host configuration directory %s: %s\n", hosts_dir, strerror(errno));
1986                 return 1;
1987         }
1988
1989         bool first = true;
1990         int result = 0;
1991         struct dirent *ent;
1992
1993         while((ent = readdir(dir))) {
1994                 if(!check_id(ent->d_name))
1995                         continue;
1996
1997                 if(first)
1998                         first = false;
1999                 else
2000                         printf("#---------------------------------------------------------------#\n");
2001
2002                 result |= export(ent->d_name, stdout);
2003         }
2004
2005         closedir(dir);
2006         if(!tty)
2007                 fclose(stdout);
2008         return result;
2009 }
2010
2011 static int cmd_import(int argc, char *argv[]) {
2012         if(argc > 1) {
2013                 fprintf(stderr, "Too many arguments!\n");
2014                 return 1;
2015         }
2016
2017         FILE *in = stdin;
2018         FILE *out = NULL;
2019
2020         char buf[4096];
2021         char name[4096];
2022         char *filename = NULL;
2023         int count = 0;
2024         bool firstline = true;
2025
2026         while(fgets(buf, sizeof buf, in)) {
2027                 if(sscanf(buf, "Name = %s", name) == 1) {
2028                         firstline = false;
2029
2030                         if(!check_id(name)) {
2031                                 fprintf(stderr, "Invalid Name in input!\n");
2032                                 return 1;
2033                         }
2034
2035                         if(out)
2036                                 fclose(out);
2037
2038                         free(filename);
2039                         xasprintf(&filename, "%s" SLASH "%s", hosts_dir, name);
2040
2041                         if(!force && !access(filename, F_OK)) {
2042                                 fprintf(stderr, "Host configuration file %s already exists, skipping.\n", filename);
2043                                 out = NULL;
2044                                 continue;
2045                         }
2046
2047                         out = fopen(filename, "w");
2048                         if(!out) {
2049                                 fprintf(stderr, "Error creating configuration file %s: %s\n", filename, strerror(errno));
2050                                 return 1;
2051                         }
2052
2053                         count++;
2054                         continue;
2055                 } else if(firstline) {
2056                         fprintf(stderr, "Junk at the beginning of the input, ignoring.\n");
2057                         firstline = false;
2058                 }
2059
2060
2061                 if(!strcmp(buf, "#---------------------------------------------------------------#\n"))
2062                         continue;
2063
2064                 if(out) {
2065                         if(fputs(buf, out) < 0) {
2066                                 fprintf(stderr, "Error writing to host configuration file %s: %s\n", filename, strerror(errno));
2067                                 return 1;
2068                         }
2069                 }
2070         }
2071
2072         if(out)
2073                 fclose(out);
2074
2075         if(count) {
2076                 fprintf(stderr, "Imported %d host configuration files.\n", count);
2077                 return 0;
2078         } else {
2079                 fprintf(stderr, "No host configuration files imported.\n");
2080                 return 1;
2081         }
2082 }
2083
2084 static int cmd_exchange(int argc, char *argv[]) {
2085         return cmd_export(argc, argv) ?: cmd_import(argc, argv);
2086 }
2087
2088 static int cmd_exchange_all(int argc, char *argv[]) {
2089         return cmd_export_all(argc, argv) ?: cmd_import(argc, argv);
2090 }
2091
2092 static int switch_network(char *name) {
2093         if(fd >= 0) {
2094                 close(fd);
2095                 fd = -1;
2096         }
2097
2098         free(confbase);
2099         confbase = NULL;
2100         free(pidfilename);
2101         pidfilename = NULL;
2102         free(logfilename);
2103         logfilename = NULL;
2104         free(unixsocketname);
2105         unixsocketname = NULL;
2106         free(tinc_conf);
2107         free(hosts_dir);
2108         free(prompt);
2109
2110         free(netname);
2111         netname = strcmp(name, ".") ? xstrdup(name) : NULL;
2112
2113         make_names();
2114         xasprintf(&tinc_conf, "%s" SLASH "tinc.conf", confbase);
2115         xasprintf(&hosts_dir, "%s" SLASH "hosts", confbase);
2116         xasprintf(&prompt, "%s> ", identname);
2117
2118         return 0;
2119 }
2120
2121 static int cmd_network(int argc, char *argv[]) {
2122         if(argc > 2) {
2123                 fprintf(stderr, "Too many arguments!\n");
2124                 return 1;
2125         }
2126
2127         if(argc == 2)
2128                 return switch_network(argv[1]);
2129
2130         DIR *dir = opendir(confdir);
2131         if(!dir) {
2132                 fprintf(stderr, "Could not read directory %s: %s\n", confdir, strerror(errno));
2133                 return 1;
2134         }
2135
2136         struct dirent *ent;
2137         while((ent = readdir(dir))) {
2138                 if(*ent->d_name == '.')
2139                         continue;
2140
2141                 if(!strcmp(ent->d_name, "tinc.conf")) {
2142                         printf(".\n");
2143                         continue;
2144                 }
2145
2146                 char *fname;
2147                 xasprintf(&fname, "%s/%s/tinc.conf", confdir, ent->d_name);
2148                 if(!access(fname, R_OK))
2149                         printf("%s\n", ent->d_name);
2150                 free(fname);
2151         }
2152
2153         closedir(dir);
2154
2155         return 0;
2156 }
2157
2158 static const struct {
2159         const char *command;
2160         int (*function)(int argc, char *argv[]);
2161         bool hidden;
2162 } commands[] = {
2163         {"start", cmd_start},
2164         {"stop", cmd_stop},
2165         {"restart", cmd_restart},
2166         {"reload", cmd_reload},
2167         {"dump", cmd_dump},
2168         {"purge", cmd_purge},
2169         {"debug", cmd_debug},
2170         {"retry", cmd_retry},
2171         {"connect", cmd_connect},
2172         {"disconnect", cmd_disconnect},
2173         {"top", cmd_top},
2174         {"pcap", cmd_pcap},
2175         {"log", cmd_log},
2176         {"pid", cmd_pid},
2177         {"config", cmd_config, true},
2178         {"add", cmd_config},
2179         {"del", cmd_config},
2180         {"get", cmd_config},
2181         {"set", cmd_config},
2182         {"init", cmd_init},
2183         {"generate-keys", cmd_generate_keys},
2184         {"generate-rsa-keys", cmd_generate_rsa_keys},
2185         {"generate-ed25519-keys", cmd_generate_ed25519_keys},
2186         {"help", cmd_help},
2187         {"version", cmd_version},
2188         {"info", cmd_info},
2189         {"edit", cmd_edit},
2190         {"export", cmd_export},
2191         {"export-all", cmd_export_all},
2192         {"import", cmd_import},
2193         {"exchange", cmd_exchange},
2194         {"exchange-all", cmd_exchange_all},
2195         {"invite", cmd_invite},
2196         {"join", cmd_join},
2197         {"network", cmd_network},
2198         {NULL, NULL},
2199 };
2200
2201 #ifdef HAVE_READLINE
2202 static char *complete_command(const char *text, int state) {
2203         static int i;
2204
2205         if(!state)
2206                 i = 0;
2207         else
2208                 i++;
2209
2210         while(commands[i].command) {
2211                 if(!commands[i].hidden && !strncasecmp(commands[i].command, text, strlen(text)))
2212                         return xstrdup(commands[i].command);
2213                 i++;
2214         }
2215
2216         return NULL;
2217 }
2218
2219 static char *complete_dump(const char *text, int state) {
2220         const char *matches[] = {"reachable", "nodes", "edges", "subnets", "connections", "graph", NULL};
2221         static int i;
2222
2223         if(!state)
2224                 i = 0;
2225         else
2226                 i++;
2227
2228         while(matches[i]) {
2229                 if(!strncasecmp(matches[i], text, strlen(text)))
2230                         return xstrdup(matches[i]);
2231                 i++;
2232         }
2233
2234         return NULL;
2235 }
2236
2237 static char *complete_config(const char *text, int state) {
2238         static int i;
2239
2240         if(!state)
2241                 i = 0;
2242         else
2243                 i++;
2244
2245         while(variables[i].name) {
2246                 char *dot = strchr(text, '.');
2247                 if(dot) {
2248                         if((variables[i].type & VAR_HOST) && !strncasecmp(variables[i].name, dot + 1, strlen(dot + 1))) {
2249                                 char *match;
2250                                 xasprintf(&match, "%.*s.%s", (int)(dot - text), text, variables[i].name);
2251                                 return match;
2252                         }
2253                 } else {
2254                         if(!strncasecmp(variables[i].name, text, strlen(text)))
2255                                 return xstrdup(variables[i].name);
2256                 }
2257                 i++;
2258         }
2259
2260         return NULL;
2261 }
2262
2263 static char *complete_info(const char *text, int state) {
2264         static int i;
2265         if(!state) {
2266                 i = 0;
2267                 if(!connect_tincd(false))
2268                         return NULL;
2269                 // Check the list of nodes
2270                 sendline(fd, "%d %d", CONTROL, REQ_DUMP_NODES);
2271                 sendline(fd, "%d %d", CONTROL, REQ_DUMP_SUBNETS);
2272         }
2273
2274         while(recvline(fd, line, sizeof line)) {
2275                 char item[4096];
2276                 int n = sscanf(line, "%d %d %s", &code, &req, item);
2277                 if(n == 2) {
2278                         i++;
2279                         if(i >= 2)
2280                                 break;
2281                         else
2282                                 continue;
2283                 }
2284
2285                 if(n != 3) {
2286                         fprintf(stderr, "Unable to parse dump from tincd, n = %d, i = %d.\n", n, i);
2287                         break;
2288                 }
2289
2290                 if(!strncmp(item, text, strlen(text)))
2291                         return xstrdup(strip_weight(item));
2292         }
2293
2294         return NULL;
2295 }
2296
2297 static char *complete_nothing(const char *text, int state) {
2298         return NULL;
2299 }
2300
2301 static char **completion (const char *text, int start, int end) {
2302         char **matches = NULL;
2303
2304         if(!start)
2305                 matches = rl_completion_matches(text, complete_command);
2306         else if(!strncasecmp(rl_line_buffer, "dump ", 5))
2307                 matches = rl_completion_matches(text, complete_dump);
2308         else if(!strncasecmp(rl_line_buffer, "add ", 4))
2309                 matches = rl_completion_matches(text, complete_config);
2310         else if(!strncasecmp(rl_line_buffer, "del ", 4))
2311                 matches = rl_completion_matches(text, complete_config);
2312         else if(!strncasecmp(rl_line_buffer, "get ", 4))
2313                 matches = rl_completion_matches(text, complete_config);
2314         else if(!strncasecmp(rl_line_buffer, "set ", 4))
2315                 matches = rl_completion_matches(text, complete_config);
2316         else if(!strncasecmp(rl_line_buffer, "info ", 5))
2317                 matches = rl_completion_matches(text, complete_info);
2318
2319         return matches;
2320 }
2321 #endif
2322
2323 static int cmd_shell(int argc, char *argv[]) {
2324         xasprintf(&prompt, "%s> ", identname);
2325         int result = 0;
2326         char buf[4096];
2327         char *line = NULL;
2328         int maxargs = argc + 16;
2329         char **nargv = xmalloc(maxargs * sizeof *nargv);
2330
2331         for(int i = 0; i < argc; i++)
2332                 nargv[i] = argv[i];
2333
2334 #ifdef HAVE_READLINE
2335         rl_readline_name = "tinc";
2336         rl_completion_entry_function = complete_nothing;
2337         rl_attempted_completion_function = completion;
2338         rl_filename_completion_desired = 0;
2339         char *copy = NULL;
2340 #endif
2341
2342         while(true) {
2343 #ifdef HAVE_READLINE
2344                 if(tty) {
2345                         free(copy);
2346                         free(line);
2347                         rl_basic_word_break_characters = "\t\n ";
2348                         line = readline(prompt);
2349                         if(line)
2350                                 copy = xstrdup(line);
2351                 } else {
2352                         line = fgets(buf, sizeof buf, stdin);
2353                 }
2354 #else
2355                 if(tty)
2356                         fputs(prompt, stdout);
2357
2358                 line = fgets(buf, sizeof buf, stdin);
2359 #endif
2360
2361                 if(!line)
2362                         break;
2363
2364                 /* Ignore comments */
2365
2366                 if(*line == '#')
2367                         continue;
2368
2369                 /* Split */
2370
2371                 int nargc = argc;
2372                 char *p = line + strspn(line, " \t\n");
2373                 char *next = strtok(p, " \t\n");
2374
2375                 while(p && *p) {
2376                         if(nargc >= maxargs) {
2377                                 fprintf(stderr, "next %p '%s', p %p '%s'\n", next, next, p, p);
2378                                 abort();
2379                                 maxargs *= 2;
2380                                 nargv = xrealloc(nargv, maxargs * sizeof *nargv);
2381                         }
2382
2383                         nargv[nargc++] = p;
2384                         p = next;
2385                         next = strtok(NULL, " \t\n");
2386                 }
2387
2388                 if(nargc == argc)
2389                         continue;
2390
2391                 if(!strcasecmp(nargv[argc], "exit") || !strcasecmp(nargv[argc], "quit"))
2392                         return result;
2393
2394                 bool found = false;
2395
2396                 for(int i = 0; commands[i].command; i++) {
2397                         if(!strcasecmp(nargv[argc], commands[i].command)) {
2398                                 result |= commands[i].function(nargc - argc - 1, nargv + argc + 1);
2399                                 found = true;
2400                                 break;
2401                         }
2402                 }
2403
2404 #ifdef HAVE_READLINE
2405                 if(tty && found)
2406                         add_history(copy);
2407 #endif
2408
2409                 if(!found) {
2410                         fprintf(stderr, "Unknown command `%s'.\n", nargv[argc]);
2411                         result |= 1;
2412                 }
2413         }
2414
2415         free(nargv);
2416
2417         if(tty)
2418                 printf("\n");
2419         return result;
2420 }
2421
2422
2423 int main(int argc, char *argv[]) {
2424         program_name = argv[0];
2425         orig_argv = argv;
2426         orig_argc = argc;
2427
2428         if(!parse_options(argc, argv))
2429                 return 1;
2430
2431         make_names();
2432         xasprintf(&tinc_conf, "%s" SLASH "tinc.conf", confbase);
2433         xasprintf(&hosts_dir, "%s" SLASH "hosts", confbase);
2434
2435         if(show_version) {
2436                 version();
2437                 return 0;
2438         }
2439
2440         if(show_help) {
2441                 usage(false);
2442                 return 0;
2443         }
2444
2445 #ifdef HAVE_MINGW
2446         static struct WSAData wsa_state;
2447
2448         if(WSAStartup(MAKEWORD(2, 2), &wsa_state)) {
2449                 fprintf(stderr, "System call `%s' failed: %s", "WSAStartup", winerror(GetLastError()));
2450                 return false;
2451         }
2452 #endif
2453
2454         srand(time(NULL));
2455         crypto_init();
2456
2457         tty = isatty(0) && isatty(1);
2458
2459         if(optind >= argc)
2460                 return cmd_shell(argc, argv);
2461
2462         for(int i = 0; commands[i].command; i++) {
2463                 if(!strcasecmp(argv[optind], commands[i].command))
2464                         return commands[i].function(argc - optind, argv + optind);
2465         }
2466
2467         fprintf(stderr, "Unknown command `%s'.\n", argv[optind]);
2468         usage(true);
2469         return 1;
2470 }