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 "crypto.h"
  27 #include "ecdsa.h"
  28 #include "meta.h"
  29 #include "protocol.h"
  30 #include "sptps.h"
  31 #include "utils.h"
  32 #include "names.h"
  33 #include "random.h"
  34
  35 #ifndef HAVE_WINDOWS
  36 #define closesocket(s) close(s)
  37 #endif
  38
  39 // Symbols necessary to link with logger.o
  40 bool send_request(struct connection_t *c, const char *msg, ...) {
  41         (void)c;
  42         (void)msg;
  43         return false;
  44 }
  45
  46 list_t connection_list;
  47
  48 bool send_meta(struct connection_t *c, const void *msg, size_t len) {
  49         (void)c;
  50         (void)msg;
  51         (void)len;
  52         return false;
  53 }
  54
  55 bool do_detach = false;
  56 struct timeval now;
  57
  58 static bool special;
  59 static bool verbose;
  60 static bool readonly;
  61 static bool writeonly;
  62 static int in = 0;
  63 static int out = 1;
  64 int addressfamily = AF_UNSPEC;
  65
  66 static bool send_data(void *handle, uint8_t type, const void *data, size_t len) {
  67         (void)type;
  68         char *hex = alloca(len * 2 + 1);
  69         bin2hex(data, hex, len);
  70
  71         if(verbose) {
  72                 fprintf(stderr, "Sending %lu bytes of data:\n%s\n", (unsigned long)len, hex);
  73         }
  74
  75         const int *sock = handle;
  76         const char *p = data;
  77
  78         while(len) {
  79                 ssize_t sent = send(*sock, p, len, 0);
  80
  81                 if(sent <= 0) {
  82                         fprintf(stderr, "Error sending data: %s\n", strerror(errno));
  83                         return false;
  84                 }
  85
  86                 p += sent;
  87                 len -= sent;
  88         }
  89
  90         return true;
  91 }
  92
  93 static bool receive_record(void *handle, uint8_t type, const void *data, uint16_t len) {
  94         (void)handle;
  95
  96         if(verbose) {
  97                 fprintf(stderr, "Received type %d record of %u bytes:\n", type, len);
  98         }
  99
 100         if(writeonly) {
 101                 return true;
 102         }
 103
 104         const char *p = data;
 105
 106         while(len) {
 107                 ssize_t written = write(out, p, len);
 108
 109                 if(written <= 0) {
 110                         fprintf(stderr, "Error writing received data: %s\n", strerror(errno));
 111                         return false;
 112                 }
 113
 114                 p += written;
 115                 len -= written;
 116         }
 117
 118         return true;
 119 }
 120
 121 typedef enum option_t {
 122         OPT_BAD_OPTION      = '?',
 123         OPT_LONG_OPTION     =  0,
 124
 125         // Short options
 126         OPT_DATAGRAM        = 'd',
 127         OPT_QUIT_ON_EOF     = 'q',
 128         OPT_READONLY        = 'r',
 129         OPT_WRITEONLY       = 'w',
 130         OPT_PACKET_LOSS     = 'L',
 131         OPT_REPLAY_WINDOW   = 'W',
 132         OPT_SPECIAL_CHAR    = 's',
 133         OPT_TUN             = 't',
 134         OPT_VERBOSE         = 'v',
 135         OPT_CIPHER_SUITES   = 'M',
 136         OPT_PREFERRED_SUITE = 'P',
 137         OPT_IPV4            = '4',
 138         OPT_IPV6            = '6',
 139
 140         // Long options
 141         OPT_HELP            = 255,
 142 } option_t;
 143
 144 static struct option const long_options[] = {
 145         {"datagram",        no_argument,       NULL, OPT_DATAGRAM},
 146         {"quit",            no_argument,       NULL, OPT_QUIT_ON_EOF},
 147         {"readonly",        no_argument,       NULL, OPT_READONLY},
 148         {"writeonly",       no_argument,       NULL, OPT_WRITEONLY},
 149         {"packet-loss",     required_argument, NULL, OPT_PACKET_LOSS},
 150         {"replay-window",   required_argument, NULL, OPT_REPLAY_WINDOW},
 151         {"special",         no_argument,       NULL, OPT_SPECIAL_CHAR},
 152         {"tun",             no_argument,       NULL, OPT_TUN},
 153         {"verbose",         required_argument, NULL, OPT_VERBOSE},
 154         {"cipher-suites",   required_argument, NULL, OPT_CIPHER_SUITES},
 155         {"preferred-suite", required_argument, NULL, OPT_PREFERRED_SUITE},
 156         {"help",            no_argument,       NULL, OPT_HELP},
 157         {NULL,              0,                 NULL, 0}
 158 };
 159
 160 static void usage(void) {
 161         fprintf(stderr,
 162                 "Usage: %s [options] my_ed25519_key_file his_ed25519_key_file [host] port\n"
 163                 "\n"
 164                 "Valid options are:\n"
 165                 "  -d, --datagram            Enable datagram mode.\n"
 166                 "  -q, --quit                Quit when EOF occurs on stdin.\n"
 167                 "  -r, --readonly            Only send data from the socket to stdout.\n"
 168 #ifdef HAVE_LINUX
 169                 "  -t, --tun                 Use a tun device instead of stdio.\n"
 170 #endif
 171                 "  -w, --writeonly           Only send data from stdin to the socket.\n"
 172                 "  -L, --packet-loss RATE    Fake packet loss of RATE percent.\n"
 173                 "  -R, --replay-window N     Set replay window to N bytes.\n"
 174                 "  -M, --cipher-suites MASK  Set the mask of allowed cipher suites.\n"
 175                 "  -P, --preferred-suite N   Set the preferred cipher suite.\n"
 176                 "  -s, --special             Enable special handling of lines starting with #, ^ and $.\n"
 177                 "  -v, --verbose             Display debug messages.\n"
 178                 "  -4                        Use IPv4.\n"
 179                 "  -6                        Use IPv6.\n"
 180                 "\n"
 181                 "Report bugs to tinc@tinc-vpn.org.\n",
 182                 program_name);
 183 }
 184
 185 #ifdef HAVE_WINDOWS
 186
 187 int stdin_sock_fd = -1;
 188
 189 // Windows does not allow calling select() on anything but sockets. Therefore,
 190 // to keep the same code as on other operating systems, we have to put a
 191 // separate thread between the stdin and the sptps loop way below. This thread
 192 // reads stdin and sends its content to the main thread through a TCP socket,
 193 // which can be properly select()'ed.
 194 static DWORD WINAPI stdin_reader_thread(LPVOID arg) {
 195         struct sockaddr_in sa;
 196         socklen_t sa_size = sizeof(sa);
 197
 198         while(true) {
 199                 int peer_fd = accept(stdin_sock_fd, (struct sockaddr *) &sa, &sa_size);
 200
 201                 if(peer_fd < 0) {
 202                         fprintf(stderr, "accept() failed: %s\n", strerror(errno));
 203                         continue;
 204                 }
 205
 206                 if(verbose) {
 207                         fprintf(stderr, "New connection received from :%d\n", ntohs(sa.sin_port));
 208                 }
 209
 210                 char buf[1024];
 211                 ssize_t nread;
 212
 213                 while((nread = read(STDIN_FILENO, buf, sizeof(buf))) > 0) {
 214                         if(verbose) {
 215                                 fprintf(stderr, "Read %lld bytes from input\n", nread);
 216                         }
 217
 218                         char *start = buf;
 219                         ssize_t nleft = nread;
 220
 221                         while(nleft) {
 222                                 ssize_t nsend = send(peer_fd, start, nleft, 0);
 223
 224                                 if(nsend < 0) {
 225                                         if(sockwouldblock(sockerrno)) {
 226                                                 continue;
 227                                         }
 228
 229                                         break;
 230                                 }
 231
 232                                 start += nsend;
 233                                 nleft -= nsend;
 234                         }
 235
 236                         if(nleft) {
 237                                 fprintf(stderr, "Could not send data: %s\n", strerror(errno));
 238                                 break;
 239                         }
 240
 241                         if(verbose) {
 242                                 fprintf(stderr, "Sent %lld bytes to peer\n", nread);
 243                         }
 244                 }
 245
 246                 closesocket(peer_fd);
 247         }
 248
 249         closesocket(stdin_sock_fd);
 250         stdin_sock_fd = -1;
 251         return 0;
 252 }
 253
 254 static int start_input_reader(void) {
 255         if(stdin_sock_fd != -1) {
 256                 fprintf(stderr, "stdin thread can only be started once.\n");
 257                 return -1;
 258         }
 259
 260         stdin_sock_fd = socket(AF_INET, SOCK_STREAM, 0);
 261
 262         if(stdin_sock_fd < 0) {
 263                 fprintf(stderr, "Could not create server socket: %s\n", strerror(errno));
 264                 return -1;
 265         }
 266
 267         struct sockaddr_in serv_sa;
 268
 269         memset(&serv_sa, 0, sizeof(serv_sa));
 270
 271         serv_sa.sin_family = AF_INET;
 272
 273         serv_sa.sin_addr.s_addr = htonl(0x7f000001); // 127.0.0.1
 274
 275         int res = bind(stdin_sock_fd, (struct sockaddr *)&serv_sa, sizeof(serv_sa));
 276
 277         if(res < 0) {
 278                 fprintf(stderr, "Could not bind socket: %s\n", strerror(errno));
 279                 goto server_err;
 280         }
 281
 282         if(listen(stdin_sock_fd, 1) < 0) {
 283                 fprintf(stderr, "Could not listen: %s\n", strerror(errno));
 284                 goto server_err;
 285         }
 286
 287         struct sockaddr_in connect_sa;
 288
 289         socklen_t addr_len = sizeof(connect_sa);
 290
 291         if(getsockname(stdin_sock_fd, (struct sockaddr *)&connect_sa, &addr_len) < 0) {
 292                 fprintf(stderr, "Could not determine the address of the stdin thread socket\n");
 293                 goto server_err;
 294         }
 295
 296         if(verbose) {
 297                 fprintf(stderr, "stdin thread is listening on :%d\n", ntohs(connect_sa.sin_port));
 298         }
 299
 300         if(!CreateThread(NULL, 0, stdin_reader_thread, NULL, 0, NULL)) {
 301                 fprintf(stderr, "Could not start reader thread: %d\n", GetLastError());
 302                 goto server_err;
 303         }
 304
 305         int client_fd = socket(AF_INET, SOCK_STREAM, 0);
 306
 307         if(client_fd < 0) {
 308                 fprintf(stderr, "Could not create client socket: %s\n", strerror(errno));
 309                 return -1;
 310         }
 311
 312         if(connect(client_fd, (struct sockaddr *)&connect_sa, sizeof(connect_sa)) < 0) {
 313                 fprintf(stderr, "Could not connect: %s\n", strerror(errno));
 314                 closesocket(client_fd);
 315                 return -1;
 316         }
 317
 318         return client_fd;
 319
 320 server_err:
 321
 322         if(stdin_sock_fd != -1) {
 323                 closesocket(stdin_sock_fd);
 324                 stdin_sock_fd = -1;
 325         }
 326
 327         return -1;
 328 }
 329
 330 #endif // HAVE_WINDOWS
 331
 332 static void print_listening_msg(int sock) {
 333         sockaddr_t sa = {0};
 334         socklen_t salen = sizeof(sa);
 335         int port = 0;
 336
 337         if(!getsockname(sock, &sa.sa, &salen)) {
 338                 port = ntohs(sa.in.sin_port);
 339         }
 340
 341         fprintf(stderr, "Listening on %d...\n", port);
 342         fflush(stderr);
 343 }
 344
 345 static int run_test(int argc, char *argv[]) {
 346         program_name = argv[0];
 347         bool initiator = false;
 348         bool datagram = false;
 349 #ifdef HAVE_LINUX
 350         bool tun = false;
 351 #endif
 352         int packetloss = 0;
 353         int r;
 354         int option_index = 0;
 355         bool quit = false;
 356         unsigned long cipher_suites = SPTPS_ALL_CIPHER_SUITES;
 357         unsigned long preferred_suite = 0;
 358
 359         while((r = getopt_long(argc, argv, "dqrstwL:W:v46", long_options, &option_index)) != EOF) {
 360                 switch((option_t) r) {
 361                 case OPT_LONG_OPTION:
 362                         break;
 363
 364                 case OPT_BAD_OPTION:
 365                         usage();
 366                         return 1;
 367
 368                 case OPT_DATAGRAM:
 369                         datagram = true;
 370                         break;
 371
 372                 case OPT_QUIT_ON_EOF:
 373                         quit = true;
 374                         break;
 375
 376                 case OPT_READONLY:
 377                         readonly = true;
 378                         break;
 379
 380                 case OPT_TUN:
 381 #ifdef HAVE_LINUX
 382                         tun = true;
 383 #else
 384                         fprintf(stderr, "--tun is only supported on Linux.\n");
 385                         usage();
 386                         return 1;
 387 #endif
 388                         break;
 389
 390                 case OPT_WRITEONLY:
 391                         writeonly = true;
 392                         break;
 393
 394                 case OPT_PACKET_LOSS:
 395                         packetloss = atoi(optarg);
 396                         break;
 397
 398                 case OPT_REPLAY_WINDOW:
 399                         sptps_replaywin = atoi(optarg);
 400                         break;
 401
 402                 case OPT_CIPHER_SUITES:
 403                         cipher_suites = strtoul(optarg, NULL, 0);
 404                         break;
 405
 406                 case OPT_PREFERRED_SUITE:
 407                         preferred_suite = strtoul(optarg, NULL, 0);
 408                         break;
 409
 410                 case OPT_VERBOSE:
 411                         verbose = true;
 412                         break;
 413
 414                 case OPT_SPECIAL_CHAR:
 415                         special = true;
 416                         break;
 417
 418                 case OPT_IPV4:
 419                         addressfamily = AF_INET;
 420                         break;
 421
 422                 case OPT_IPV6:
 423                         addressfamily = AF_INET6;
 424                         break;
 425
 426                 case OPT_HELP:
 427                         usage();
 428                         return 0;
 429
 430                 default:
 431                         break;
 432                 }
 433         }
 434
 435         argc -= optind - 1;
 436         argv += optind - 1;
 437
 438         if(argc < 4 || argc > 5) {
 439                 fprintf(stderr, "Wrong number of arguments.\n");
 440                 usage();
 441                 return 1;
 442         }
 443
 444         if(argc > 4) {
 445                 initiator = true;
 446         }
 447
 448 #ifdef HAVE_LINUX
 449
 450         if(tun) {
 451                 in = out = open("/dev/net/tun", O_RDWR | O_NONBLOCK);
 452
 453                 if(in < 0) {
 454                         fprintf(stderr, "Could not open tun device: %s\n", strerror(errno));
 455                         return 1;
 456                 }
 457
 458                 struct ifreq ifr = {
 459                         .ifr_flags = IFF_TUN
 460                 };
 461
 462                 if(ioctl(in, TUNSETIFF, &ifr)) {
 463                         fprintf(stderr, "Could not configure tun interface: %s\n", strerror(errno));
 464                         return 1;
 465                 }
 466
 467                 ifr.ifr_name[IFNAMSIZ - 1] = 0;
 468                 fprintf(stderr, "Using tun interface %s\n", ifr.ifr_name);
 469         }
 470
 471 #endif
 472
 473 #ifdef HAVE_WINDOWS
 474         static struct WSAData wsa_state;
 475
 476         if(WSAStartup(MAKEWORD(2, 2), &wsa_state)) {
 477                 return 1;
 478         }
 479
 480 #endif
 481
 482         struct addrinfo *ai, hint;
 483         memset(&hint, 0, sizeof(hint));
 484
 485         hint.ai_family = addressfamily;
 486         hint.ai_socktype = datagram ? SOCK_DGRAM : SOCK_STREAM;
 487         hint.ai_protocol = datagram ? IPPROTO_UDP : IPPROTO_TCP;
 488         hint.ai_flags = initiator ? 0 : AI_PASSIVE;
 489
 490         if(getaddrinfo(initiator ? argv[3] : NULL, initiator ? argv[4] : argv[3], &hint, &ai) || !ai) {
 491                 fprintf(stderr, "getaddrinfo() failed: %s\n", sockstrerror(sockerrno));
 492                 return 1;
 493         }
 494
 495         int sock = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol);
 496
 497         if(sock < 0) {
 498                 fprintf(stderr, "Could not create socket: %s\n", sockstrerror(sockerrno));
 499                 freeaddrinfo(ai);
 500                 return 1;
 501         }
 502
 503         int one = 1;
 504         setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, (void *)&one, sizeof(one));
 505
 506         if(initiator) {
 507                 int res = connect(sock, ai->ai_addr, ai->ai_addrlen);
 508
 509                 freeaddrinfo(ai);
 510                 ai = NULL;
 511
 512                 if(res) {
 513                         fprintf(stderr, "Could not connect to peer: %s\n", sockstrerror(sockerrno));
 514                         return 1;
 515                 }
 516
 517                 fprintf(stderr, "Connected\n");
 518         } else {
 519                 int res = bind(sock, ai->ai_addr, ai->ai_addrlen);
 520
 521                 freeaddrinfo(ai);
 522                 ai = NULL;
 523
 524                 if(res) {
 525                         fprintf(stderr, "Could not bind socket: %s\n", sockstrerror(sockerrno));
 526                         return 1;
 527                 }
 528
 529                 if(!datagram) {
 530                         if(listen(sock, 1)) {
 531                                 fprintf(stderr, "Could not listen on socket: %s\n", sockstrerror(sockerrno));
 532                                 return 1;
 533                         }
 534
 535                         print_listening_msg(sock);
 536
 537                         sock = accept(sock, NULL, NULL);
 538
 539                         if(sock < 0) {
 540                                 fprintf(stderr, "Could not accept connection: %s\n", sockstrerror(sockerrno));
 541                                 return 1;
 542                         }
 543                 } else {
 544                         print_listening_msg(sock);
 545
 546                         char buf[65536];
 547                         struct sockaddr addr;
 548                         socklen_t addrlen = sizeof(addr);
 549
 550                         if(recvfrom(sock, buf, sizeof(buf), MSG_PEEK, &addr, &addrlen) <= 0) {
 551                                 fprintf(stderr, "Could not read from socket: %s\n", sockstrerror(sockerrno));
 552                                 return 1;
 553                         }
 554
 555                         if(connect(sock, &addr, addrlen)) {
 556                                 fprintf(stderr, "Could not accept connection: %s\n", sockstrerror(sockerrno));
 557                                 return 1;
 558                         }
 559                 }
 560
 561                 fprintf(stderr, "Connected\n");
 562         }
 563
 564         FILE *fp = fopen(argv[1], "r");
 565
 566         if(!fp) {
 567                 fprintf(stderr, "Could not open %s: %s\n", argv[1], strerror(errno));
 568                 return 1;
 569         }
 570
 571         ecdsa_t *mykey = NULL;
 572
 573         if(!(mykey = ecdsa_read_pem_private_key(fp))) {
 574                 return 1;
 575         }
 576
 577         fclose(fp);
 578
 579         fp = fopen(argv[2], "r");
 580
 581         if(!fp) {
 582                 fprintf(stderr, "Could not open %s: %s\n", argv[2], strerror(errno));
 583                 ecdsa_free(mykey);
 584                 return 1;
 585         }
 586
 587         ecdsa_t *hiskey = NULL;
 588
 589         if(!(hiskey = ecdsa_read_pem_public_key(fp))) {
 590                 ecdsa_free(mykey);
 591                 return 1;
 592         }
 593
 594         fclose(fp);
 595
 596         if(verbose) {
 597                 fprintf(stderr, "Keys loaded\n");
 598         }
 599
 600         sptps_t s;
 601
 602         sptps_params_t params = {
 603                 .handle = &sock,
 604                 .initiator = initiator,
 605                 .datagram = datagram,
 606                 .mykey = mykey,
 607                 .hiskey = hiskey,
 608                 .label = "sptps_test",
 609                 .send_data = send_data,
 610                 .receive_record = receive_record,
 611                 .cipher_suites = cipher_suites,
 612                 .preferred_suite = preferred_suite,
 613         };
 614
 615         if(!sptps_start(&s, &params)) {
 616                 ecdsa_free(mykey);
 617                 ecdsa_free(hiskey);
 618                 return 1;
 619         }
 620
 621 #ifdef HAVE_WINDOWS
 622
 623         if(!readonly) {
 624                 in = start_input_reader();
 625
 626                 if(in < 0) {
 627                         fprintf(stderr, "Could not init stdin reader thread\n");
 628                         ecdsa_free(mykey);
 629                         ecdsa_free(hiskey);
 630                         return 1;
 631                 }
 632         }
 633
 634 #endif
 635
 636         int max_fd = MAX(sock, in);
 637
 638         while(true) {
 639                 if(writeonly && readonly) {
 640                         break;
 641                 }
 642
 643                 char buf[65535] = "";
 644                 size_t readsize = datagram ? 1460u : sizeof(buf);
 645
 646                 fd_set fds;
 647                 FD_ZERO(&fds);
 648
 649                 if(!readonly && s.instate) {
 650                         FD_SET(in, &fds);
 651                 }
 652
 653                 FD_SET(sock, &fds);
 654
 655                 if(select(max_fd + 1, &fds, NULL, NULL, NULL) <= 0) {
 656                         ecdsa_free(mykey);
 657                         ecdsa_free(hiskey);
 658                         return 1;
 659                 }
 660
 661                 if(FD_ISSET(in, &fds)) {
 662 #ifdef HAVE_WINDOWS
 663                         ssize_t len = recv(in, buf, readsize, 0);
 664 #else
 665                         ssize_t len = read(in, buf, readsize);
 666 #endif
 667
 668                         if(len < 0) {
 669                                 fprintf(stderr, "Could not read from stdin: %s\n", strerror(errno));
 670                                 ecdsa_free(mykey);
 671                                 ecdsa_free(hiskey);
 672                                 return 1;
 673                         }
 674
 675                         if(len == 0) {
 676 #ifdef HAVE_WINDOWS
 677                                 shutdown(in, SD_SEND);
 678                                 closesocket(in);
 679 #endif
 680
 681                                 if(quit) {
 682                                         break;
 683                                 }
 684
 685                                 readonly = true;
 686                                 continue;
 687                         }
 688
 689                         if(special && buf[0] == '#') {
 690                                 s.outseqno = atoi(buf + 1);
 691                         }
 692
 693                         if(special && buf[0] == '^') {
 694                                 sptps_send_record(&s, SPTPS_HANDSHAKE, NULL, 0);
 695                         } else if(special && buf[0] == '$') {
 696                                 sptps_force_kex(&s);
 697
 698                                 if(len > 1) {
 699                                         sptps_send_record(&s, 0, buf, len);
 700                                 }
 701                         } else if(!sptps_send_record(&s, buf[0] == '!' ? 1 : 0, buf, (len == 1 && buf[0] == '\n') ? 0 : buf[0] == '*' ? sizeof(buf) : (size_t)len)) {
 702                                 ecdsa_free(mykey);
 703                                 ecdsa_free(hiskey);
 704                                 return 1;
 705                         }
 706                 }
 707
 708                 if(FD_ISSET(sock, &fds)) {
 709                         ssize_t len = recv(sock, buf, sizeof(buf), 0);
 710
 711                         if(len < 0) {
 712                                 fprintf(stderr, "Could not read from socket: %s\n", sockstrerror(sockerrno));
 713                                 ecdsa_free(mykey);
 714                                 ecdsa_free(hiskey);
 715                                 return 1;
 716                         }
 717
 718                         if(len == 0) {
 719                                 fprintf(stderr, "Connection terminated by peer.\n");
 720                                 break;
 721                         }
 722
 723                         if(verbose) {
 724                                 char *hex = alloca(len * 2 + 1);
 725                                 bin2hex(buf, hex, len);
 726                                 fprintf(stderr, "Received %ld bytes of data:\n%s\n", (long)len, hex);
 727                         }
 728
 729                         if(packetloss && (int)prng(100) < packetloss) {
 730                                 if(verbose) {
 731                                         fprintf(stderr, "Dropped.\n");
 732                                 }
 733
 734                                 continue;
 735                         }
 736
 737                         char *bufp = buf;
 738
 739                         while(len) {
 740                                 size_t done = sptps_receive_data(&s, bufp, len);
 741
 742                                 if(!done) {
 743                                         if(!datagram) {
 744                                                 ecdsa_free(mykey);
 745                                                 ecdsa_free(hiskey);
 746                                                 return 1;
 747                                         }
 748                                 }
 749
 750                                 bufp += done;
 751                                 len -= (ssize_t) done;
 752                         }
 753                 }
 754         }
 755
 756         bool stopped = sptps_stop(&s);
 757
 758         ecdsa_free(mykey);
 759         ecdsa_free(hiskey);
 760         closesocket(sock);
 761
 762         return !stopped;
 763 }
 764
 765 int main(int argc, char *argv[]) {
 766         random_init();
 767         crypto_init();
 768         prng_init();
 769
 770         int result = run_test(argc, argv);
 771
 772         random_exit();
 773
 774         return result;
 775 }