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

   1 /*
   2     sptps_test.c -- Simple Peer-to-Peer Security test program
   3     Copyright (C) 2011-2022 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 #ifdef HAVE_LINUX
  23 #include <linux/if_tun.h>
  24 #endif
  25
  26 #include <getopt.h>
  27
  28 #ifdef HAVE_MINGW
  29 #include <pthread.h>
  30 #endif
  31
  32 #include "crypto.h"
  33 #include "ecdsa.h"
  34 #include "meta.h"
  35 #include "protocol.h"
  36 #include "sptps.h"
  37 #include "utils.h"
  38
  39 #ifndef HAVE_MINGW
  40 #define closesocket(s) close(s)
  41 #endif
  42
  43 // Symbols necessary to link with logger.o
  44 bool send_request(struct connection_t *c, const char *msg, ...) {
  45         (void)c;
  46         (void)msg;
  47         return false;
  48 }
  49
  50 list_t connection_list;
  51
  52 bool send_meta(struct connection_t *c, const void *msg, size_t len) {
  53         (void)c;
  54         (void)msg;
  55         (void)len;
  56         return false;
  57 }
  58
  59 char *logfilename = NULL;
  60 bool do_detach = false;
  61 struct timeval now;
  62
  63 static bool special;
  64 static bool verbose;
  65 static bool readonly;
  66 static bool writeonly;
  67 static int in = 0;
  68 static int out = 1;
  69 int addressfamily = AF_UNSPEC;
  70
  71 static bool send_data(void *handle, uint8_t type, const void *data, size_t len) {
  72         (void)type;
  73         char hex[len * 2 + 1];
  74         bin2hex(data, hex, len);
  75
  76         if(verbose) {
  77                 fprintf(stderr, "Sending %lu bytes of data:\n%s\n", (unsigned long)len, hex);
  78         }
  79
  80         const int *sock = handle;
  81         const char *p = data;
  82
  83         while(len) {
  84                 ssize_t sent = send(*sock, p, len, 0);
  85
  86                 if(sent <= 0) {
  87                         fprintf(stderr, "Error sending data: %s\n", strerror(errno));
  88                         return false;
  89                 }
  90
  91                 p += sent;
  92                 len -= sent;
  93         }
  94
  95         return true;
  96 }
  97
  98 static bool receive_record(void *handle, uint8_t type, const void *data, uint16_t len) {
  99         (void)handle;
 100
 101         if(verbose) {
 102                 fprintf(stderr, "Received type %d record of %u bytes:\n", type, len);
 103         }
 104
 105         if(writeonly) {
 106                 return true;
 107         }
 108
 109         const char *p = data;
 110
 111         while(len) {
 112                 ssize_t written = write(out, p, len);
 113
 114                 if(written <= 0) {
 115                         fprintf(stderr, "Error writing received data: %s\n", strerror(errno));
 116                         return false;
 117                 }
 118
 119                 p += written;
 120                 len -= written;
 121         }
 122
 123         return true;
 124 }
 125
 126 static struct option const long_options[] = {
 127         {"datagram", no_argument, NULL, 'd'},
 128         {"quit", no_argument, NULL, 'q'},
 129         {"readonly", no_argument, NULL, 'r'},
 130         {"writeonly", no_argument, NULL, 'w'},
 131         {"packet-loss", required_argument, NULL, 'L'},
 132         {"replay-window", required_argument, NULL, 'W'},
 133         {"special", no_argument, NULL, 's'},
 134         {"verbose", required_argument, NULL, 'v'},
 135         {"help", no_argument, NULL, 1},
 136         {NULL, 0, NULL, 0}
 137 };
 138
 139 const char *program_name;
 140
 141 static void usage(void) {
 142         static const char *message =
 143                 "Usage: %s [options] my_ed25519_key_file his_ed25519_key_file [host] port\n"
 144                 "\n"
 145                 "Valid options are:\n"
 146                 "  -d, --datagram          Enable datagram mode.\n"
 147                 "  -q, --quit              Quit when EOF occurs on stdin.\n"
 148                 "  -r, --readonly          Only send data from the socket to stdout.\n"
 149 #ifdef HAVE_LINUX
 150                 "  -t, --tun               Use a tun device instead of stdio.\n"
 151 #endif
 152                 "  -w, --writeonly         Only send data from stdin to the socket.\n"
 153                 "  -L, --packet-loss RATE  Fake packet loss of RATE percent.\n"
 154                 "  -R, --replay-window N   Set replay window to N bytes.\n"
 155                 "  -s, --special           Enable special handling of lines starting with #, ^ and $.\n"
 156                 "  -v, --verbose           Display debug messages.\n"
 157                 "  -4                      Use IPv4.\n"
 158                 "  -6                      Use IPv6.\n"
 159                 "\n"
 160                 "Report bugs to tinc@tinc-vpn.org.\n";
 161
 162         fprintf(stderr, message, program_name);
 163 }
 164
 165 #ifdef HAVE_MINGW
 166
 167 int stdin_sock_fd = -1;
 168
 169 // Windows does not allow calling select() on anything but sockets. Therefore,
 170 // to keep the same code as on other operating systems, we have to put a
 171 // separate thread between the stdin and the sptps loop way below. This thread
 172 // reads stdin and sends its content to the main thread through a TCP socket,
 173 // which can be properly select()'ed.
 174 static void *stdin_reader_thread(void *arg) {
 175         struct sockaddr_in sa;
 176         socklen_t sa_size = sizeof(sa);
 177
 178         while(true) {
 179                 int peer_fd = accept(stdin_sock_fd, (struct sockaddr *) &sa, &sa_size);
 180
 181                 if(peer_fd < 0) {
 182                         fprintf(stderr, "accept() failed: %s\n", strerror(errno));
 183                         continue;
 184                 }
 185
 186                 if(verbose) {
 187                         fprintf(stderr, "New connection received from :%d\n", ntohs(sa.sin_port));
 188                 }
 189
 190                 char buf[1024];
 191                 ssize_t nread;
 192
 193                 while((nread = read(STDIN_FILENO, buf, sizeof(buf))) > 0) {
 194                         if(verbose) {
 195                                 fprintf(stderr, "Read %lld bytes from input\n", nread);
 196                         }
 197
 198                         char *start = buf;
 199                         ssize_t nleft = nread;
 200
 201                         while(nleft) {
 202                                 ssize_t nsend = send(peer_fd, start, nleft, 0);
 203
 204                                 if(nsend < 0) {
 205                                         if(sockwouldblock(sockerrno)) {
 206                                                 continue;
 207                                         }
 208
 209                                         break;
 210                                 }
 211
 212                                 start += nsend;
 213                                 nleft -= nsend;
 214                         }
 215
 216                         if(nleft) {
 217                                 fprintf(stderr, "Could not send data: %s\n", strerror(errno));
 218                                 break;
 219                         }
 220
 221                         if(verbose) {
 222                                 fprintf(stderr, "Sent %lld bytes to peer\n", nread);
 223                         }
 224                 }
 225
 226                 closesocket(peer_fd);
 227         }
 228
 229         closesocket(stdin_sock_fd);
 230         stdin_sock_fd = -1;
 231         return NULL;
 232 }
 233
 234 static int start_input_reader(void) {
 235         if(stdin_sock_fd != -1) {
 236                 fprintf(stderr, "stdin thread can only be started once.\n");
 237                 return -1;
 238         }
 239
 240         stdin_sock_fd = socket(AF_INET, SOCK_STREAM, 0);
 241
 242         if(stdin_sock_fd < 0) {
 243                 fprintf(stderr, "Could not create server socket: %s\n", strerror(errno));
 244                 return -1;
 245         }
 246
 247         struct sockaddr_in serv_sa;
 248
 249         memset(&serv_sa, 0, sizeof(serv_sa));
 250
 251         serv_sa.sin_family = AF_INET;
 252
 253         serv_sa.sin_addr.s_addr = htonl(0x7f000001); // 127.0.0.1
 254
 255         int res = bind(stdin_sock_fd, (struct sockaddr *)&serv_sa, sizeof(serv_sa));
 256
 257         if(res < 0) {
 258                 fprintf(stderr, "Could not bind socket: %s\n", strerror(errno));
 259                 goto server_err;
 260         }
 261
 262         if(listen(stdin_sock_fd, 1) < 0) {
 263                 fprintf(stderr, "Could not listen: %s\n", strerror(errno));
 264                 goto server_err;
 265         }
 266
 267         struct sockaddr_in connect_sa;
 268
 269         socklen_t addr_len = sizeof(connect_sa);
 270
 271         if(getsockname(stdin_sock_fd, (struct sockaddr *)&connect_sa, &addr_len) < 0) {
 272                 fprintf(stderr, "Could not determine the address of the stdin thread socket\n");
 273                 goto server_err;
 274         }
 275
 276         if(verbose) {
 277                 fprintf(stderr, "stdin thread is listening on :%d\n", ntohs(connect_sa.sin_port));
 278         }
 279
 280         pthread_t th;
 281         int err = pthread_create(&th, NULL, stdin_reader_thread, NULL);
 282
 283         if(err) {
 284                 fprintf(stderr, "Could not start reader thread: %s\n", strerror(err));
 285                 goto server_err;
 286         }
 287
 288         int client_fd = socket(AF_INET, SOCK_STREAM, 0);
 289
 290         if(client_fd < 0) {
 291                 fprintf(stderr, "Could not create client socket: %s\n", strerror(errno));
 292                 return -1;
 293         }
 294
 295         if(connect(client_fd, (struct sockaddr *)&connect_sa, sizeof(connect_sa)) < 0) {
 296                 fprintf(stderr, "Could not connect: %s\n", strerror(errno));
 297                 closesocket(client_fd);
 298                 return -1;
 299         }
 300
 301         return client_fd;
 302
 303 server_err:
 304
 305         if(stdin_sock_fd != -1) {
 306                 closesocket(stdin_sock_fd);
 307                 stdin_sock_fd = -1;
 308         }
 309
 310         return -1;
 311 }
 312
 313 #endif // HAVE_MINGW
 314
 315 int main(int argc, char *argv[]) {
 316         program_name = argv[0];
 317         bool initiator = false;
 318         bool datagram = false;
 319 #ifdef HAVE_LINUX
 320         bool tun = false;
 321 #endif
 322         int packetloss = 0;
 323         int r;
 324         int option_index = 0;
 325         bool quit = false;
 326
 327         while((r = getopt_long(argc, argv, "dqrstwL:W:v46", long_options, &option_index)) != EOF) {
 328                 switch(r) {
 329                 case 0:   /* long option */
 330                         break;
 331
 332                 case 'd': /* datagram mode */
 333                         datagram = true;
 334                         break;
 335
 336                 case 'q': /* close connection on EOF from stdin */
 337                         quit = true;
 338                         break;
 339
 340                 case 'r': /* read only */
 341                         readonly = true;
 342                         break;
 343
 344                 case 't': /* read only */
 345 #ifdef HAVE_LINUX
 346                         tun = true;
 347 #else
 348                         fprintf(stderr, "--tun is only supported on Linux.\n");
 349                         usage();
 350                         return 1;
 351 #endif
 352                         break;
 353
 354                 case 'w': /* write only */
 355                         writeonly = true;
 356                         break;
 357
 358                 case 'L': /* packet loss rate */
 359                         packetloss = atoi(optarg);
 360                         break;
 361
 362                 case 'W': /* replay window size */
 363                         sptps_replaywin = atoi(optarg);
 364                         break;
 365
 366                 case 'v': /* be verbose */
 367                         verbose = true;
 368                         break;
 369
 370                 case 's': /* special character handling */
 371                         special = true;
 372                         break;
 373
 374                 case '?': /* wrong options */
 375                         usage();
 376                         return 1;
 377
 378                 case '4': /* IPv4 */
 379                         addressfamily = AF_INET;
 380                         break;
 381
 382                 case '6': /* IPv6 */
 383                         addressfamily = AF_INET6;
 384                         break;
 385
 386                 case 1: /* help */
 387                         usage();
 388                         return 0;
 389
 390                 default:
 391                         break;
 392                 }
 393         }
 394
 395         argc -= optind - 1;
 396         argv += optind - 1;
 397
 398         if(argc < 4 || argc > 5) {
 399                 fprintf(stderr, "Wrong number of arguments.\n");
 400                 usage();
 401                 return 1;
 402         }
 403
 404         if(argc > 4) {
 405                 initiator = true;
 406         }
 407
 408 #ifdef HAVE_LINUX
 409
 410         if(tun) {
 411                 in = out = open("/dev/net/tun", O_RDWR | O_NONBLOCK);
 412
 413                 if(in < 0) {
 414                         fprintf(stderr, "Could not open tun device: %s\n", strerror(errno));
 415                         return 1;
 416                 }
 417
 418                 struct ifreq ifr = {
 419                         .ifr_flags = IFF_TUN
 420                 };
 421
 422                 if(ioctl(in, TUNSETIFF, &ifr)) {
 423                         fprintf(stderr, "Could not configure tun interface: %s\n", strerror(errno));
 424                         return 1;
 425                 }
 426
 427                 ifr.ifr_name[IFNAMSIZ - 1] = 0;
 428                 fprintf(stderr, "Using tun interface %s\n", ifr.ifr_name);
 429         }
 430
 431 #endif
 432
 433 #ifdef HAVE_MINGW
 434         static struct WSAData wsa_state;
 435
 436         if(WSAStartup(MAKEWORD(2, 2), &wsa_state)) {
 437                 return 1;
 438         }
 439
 440 #endif
 441
 442         struct addrinfo *ai, hint;
 443         memset(&hint, 0, sizeof(hint));
 444
 445         hint.ai_family = addressfamily;
 446         hint.ai_socktype = datagram ? SOCK_DGRAM : SOCK_STREAM;
 447         hint.ai_protocol = datagram ? IPPROTO_UDP : IPPROTO_TCP;
 448         hint.ai_flags = initiator ? 0 : AI_PASSIVE;
 449
 450         if(getaddrinfo(initiator ? argv[3] : NULL, initiator ? argv[4] : argv[3], &hint, &ai) || !ai) {
 451                 fprintf(stderr, "getaddrinfo() failed: %s\n", sockstrerror(sockerrno));
 452                 return 1;
 453         }
 454
 455         int sock = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol);
 456
 457         if(sock < 0) {
 458                 fprintf(stderr, "Could not create socket: %s\n", sockstrerror(sockerrno));
 459                 freeaddrinfo(ai);
 460                 return 1;
 461         }
 462
 463         int one = 1;
 464         setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, (void *)&one, sizeof(one));
 465
 466         if(initiator) {
 467                 int res = connect(sock, ai->ai_addr, ai->ai_addrlen);
 468
 469                 freeaddrinfo(ai);
 470                 ai = NULL;
 471
 472                 if(res) {
 473                         fprintf(stderr, "Could not connect to peer: %s\n", sockstrerror(sockerrno));
 474                         return 1;
 475                 }
 476
 477                 fprintf(stderr, "Connected\n");
 478         } else {
 479                 int res = bind(sock, ai->ai_addr, ai->ai_addrlen);
 480
 481                 freeaddrinfo(ai);
 482                 ai = NULL;
 483
 484                 if(res) {
 485                         fprintf(stderr, "Could not bind socket: %s\n", sockstrerror(sockerrno));
 486                         return 1;
 487                 }
 488
 489                 if(!datagram) {
 490                         if(listen(sock, 1)) {
 491                                 fprintf(stderr, "Could not listen on socket: %s\n", sockstrerror(sockerrno));
 492                                 return 1;
 493                         }
 494
 495                         fprintf(stderr, "Listening...\n");
 496
 497                         sock = accept(sock, NULL, NULL);
 498
 499                         if(sock < 0) {
 500                                 fprintf(stderr, "Could not accept connection: %s\n", sockstrerror(sockerrno));
 501                                 return 1;
 502                         }
 503                 } else {
 504                         fprintf(stderr, "Listening...\n");
 505
 506                         char buf[65536];
 507                         struct sockaddr addr;
 508                         socklen_t addrlen = sizeof(addr);
 509
 510                         if(recvfrom(sock, buf, sizeof(buf), MSG_PEEK, &addr, &addrlen) <= 0) {
 511                                 fprintf(stderr, "Could not read from socket: %s\n", sockstrerror(sockerrno));
 512                                 return 1;
 513                         }
 514
 515                         if(connect(sock, &addr, addrlen)) {
 516                                 fprintf(stderr, "Could not accept connection: %s\n", sockstrerror(sockerrno));
 517                                 return 1;
 518                         }
 519                 }
 520
 521                 fprintf(stderr, "Connected\n");
 522         }
 523
 524         crypto_init();
 525         prng_init();
 526
 527         FILE *fp = fopen(argv[1], "r");
 528
 529         if(!fp) {
 530                 fprintf(stderr, "Could not open %s: %s\n", argv[1], strerror(errno));
 531                 return 1;
 532         }
 533
 534         ecdsa_t *mykey = NULL;
 535
 536         if(!(mykey = ecdsa_read_pem_private_key(fp))) {
 537                 return 1;
 538         }
 539
 540         fclose(fp);
 541
 542         fp = fopen(argv[2], "r");
 543
 544         if(!fp) {
 545                 fprintf(stderr, "Could not open %s: %s\n", argv[2], strerror(errno));
 546                 free(mykey);
 547                 return 1;
 548         }
 549
 550         ecdsa_t *hiskey = NULL;
 551
 552         if(!(hiskey = ecdsa_read_pem_public_key(fp))) {
 553                 free(mykey);
 554                 return 1;
 555         }
 556
 557         fclose(fp);
 558
 559         if(verbose) {
 560                 fprintf(stderr, "Keys loaded\n");
 561         }
 562
 563         sptps_t s;
 564
 565         if(!sptps_start(&s, &sock, initiator, datagram, mykey, hiskey, "sptps_test", 10, send_data, receive_record)) {
 566                 free(mykey);
 567                 free(hiskey);
 568                 return 1;
 569         }
 570
 571 #ifdef HAVE_MINGW
 572
 573         if(!readonly) {
 574                 in = start_input_reader();
 575
 576                 if(in < 0) {
 577                         fprintf(stderr, "Could not init stdin reader thread\n");
 578                         free(mykey);
 579                         free(hiskey);
 580                         return 1;
 581                 }
 582         }
 583
 584 #endif
 585
 586         int max_fd = MAX(sock, in);
 587
 588         while(true) {
 589                 if(writeonly && readonly) {
 590                         break;
 591                 }
 592
 593                 char buf[65535] = "";
 594                 size_t readsize = datagram ? 1460u : sizeof(buf);
 595
 596                 fd_set fds;
 597                 FD_ZERO(&fds);
 598
 599                 if(!readonly && s.instate) {
 600                         FD_SET(in, &fds);
 601                 }
 602
 603                 FD_SET(sock, &fds);
 604
 605                 if(select(max_fd + 1, &fds, NULL, NULL, NULL) <= 0) {
 606                         free(mykey);
 607                         free(hiskey);
 608                         return 1;
 609                 }
 610
 611                 if(FD_ISSET(in, &fds)) {
 612 #ifdef HAVE_MINGW
 613                         ssize_t len = recv(in, buf, readsize, 0);
 614 #else
 615                         ssize_t len = read(in, buf, readsize);
 616 #endif
 617
 618                         if(len < 0) {
 619                                 fprintf(stderr, "Could not read from stdin: %s\n", strerror(errno));
 620                                 free(mykey);
 621                                 free(hiskey);
 622                                 return 1;
 623                         }
 624
 625                         if(len == 0) {
 626 #ifdef HAVE_MINGW
 627                                 shutdown(in, SD_SEND);
 628                                 closesocket(in);
 629 #endif
 630
 631                                 if(quit) {
 632                                         break;
 633                                 }
 634
 635                                 readonly = true;
 636                                 continue;
 637                         }
 638
 639                         if(special && buf[0] == '#') {
 640                                 s.outseqno = atoi(buf + 1);
 641                         }
 642
 643                         if(special && buf[0] == '^') {
 644                                 sptps_send_record(&s, SPTPS_HANDSHAKE, NULL, 0);
 645                         } else if(special && buf[0] == '$') {
 646                                 sptps_force_kex(&s);
 647
 648                                 if(len > 1) {
 649                                         sptps_send_record(&s, 0, buf, len);
 650                                 }
 651                         } else if(!sptps_send_record(&s, buf[0] == '!' ? 1 : 0, buf, (len == 1 && buf[0] == '\n') ? 0 : buf[0] == '*' ? sizeof(buf) : (size_t)len)) {
 652                                 free(mykey);
 653                                 free(hiskey);
 654                                 return 1;
 655                         }
 656                 }
 657
 658                 if(FD_ISSET(sock, &fds)) {
 659                         ssize_t len = recv(sock, buf, sizeof(buf), 0);
 660
 661                         if(len < 0) {
 662                                 fprintf(stderr, "Could not read from socket: %s\n", sockstrerror(sockerrno));
 663                                 free(mykey);
 664                                 free(hiskey);
 665                                 return 1;
 666                         }
 667
 668                         if(len == 0) {
 669                                 fprintf(stderr, "Connection terminated by peer.\n");
 670                                 break;
 671                         }
 672
 673                         if(verbose) {
 674                                 char hex[len * 2 + 1];
 675                                 bin2hex(buf, hex, len);
 676                                 fprintf(stderr, "Received %ld bytes of data:\n%s\n", (long)len, hex);
 677                         }
 678
 679                         if(packetloss && (int)prng(100) < packetloss) {
 680                                 if(verbose) {
 681                                         fprintf(stderr, "Dropped.\n");
 682                                 }
 683
 684                                 continue;
 685                         }
 686
 687                         char *bufp = buf;
 688
 689                         while(len) {
 690                                 size_t done = sptps_receive_data(&s, bufp, len);
 691
 692                                 if(!done) {
 693                                         if(!datagram) {
 694                                                 free(mykey);
 695                                                 free(hiskey);
 696                                                 return 1;
 697                                         }
 698                                 }
 699
 700                                 bufp += done;
 701                                 len -= (ssize_t) done;
 702                         }
 703                 }
 704         }
 705
 706         bool stopped = sptps_stop(&s);
 707
 708         free(mykey);
 709         free(hiskey);
 710
 711         if(!stopped) {
 712                 return 1;
 713         }
 714
 715         closesocket(sock);
 716
 717         return 0;
 718 }