www.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) 2011-2014 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 #ifdef HAVE_LINUX
  23 #include <linux/if_tun.h>
  24 #endif
  25
  26 #include <getopt.h>
  27
  28 #include "crypto.h"
  29 #include "ecdsa.h"
  30 #include "sptps.h"
  31 #include "utils.h"
  32
  33 // Symbols necessary to link with logger.o
  34 bool send_request(void *c, const char *msg, ...) { return false; }
  35 struct list_t *connection_list = NULL;
  36 bool send_meta(void *c, const char *msg , int len) { return false; }
  37 char *logfilename = NULL;
  38 bool do_detach = false;
  39 struct timeval now;
  40
  41 static bool special;
  42 static bool verbose;
  43 static bool readonly;
  44 static bool writeonly;
  45 static int in = 0;
  46 static int out = 1;
  47 static int addressfamily = AF_UNSPEC;
  48
  49 static bool send_data(void *handle, uint8_t type, const void *data, size_t len) {
  50         char hex[len * 2 + 1];
  51         bin2hex(data, hex, len);
  52         if(verbose)
  53                 fprintf(stderr, "Sending %d bytes of data:\n%s\n", (int)len, hex);
  54         const int *sock = handle;
  55         if(send(*sock, data, len, 0) != len)
  56                 return false;
  57         return true;
  58 }
  59
  60 static bool receive_record(void *handle, uint8_t type, const void *data, uint16_t len) {
  61         if(verbose)
  62                 fprintf(stderr, "Received type %d record of %hu bytes:\n", type, len);
  63         if(!writeonly)
  64                 write(out, data, len);
  65         return true;
  66 }
  67
  68 static struct option const long_options[] = {
  69         {"datagram", no_argument, NULL, 'd'},
  70         {"quit", no_argument, NULL, 'q'},
  71         {"readonly", no_argument, NULL, 'r'},
  72         {"writeonly", no_argument, NULL, 'w'},
  73         {"packet-loss", required_argument, NULL, 'L'},
  74         {"replay-window", required_argument, NULL, 'W'},
  75         {"special", no_argument, NULL, 's'},
  76         {"verbose", required_argument, NULL, 'v'},
  77         {"help", no_argument, NULL, 1},
  78         {NULL, 0, NULL, 0}
  79 };
  80
  81 const char *program_name;
  82
  83 static void usage() {
  84         fprintf(stderr, "Usage: %s [options] my_ed25519_key_file his_ed25519_key_file [host] port\n\n", program_name);
  85         fprintf(stderr, "Valid options are:\n"
  86                         "  -d, --datagram          Enable datagram mode.\n"
  87                         "  -q, --quit              Quit when EOF occurs on stdin.\n"
  88                         "  -r, --readonly          Only send data from the socket to stdout.\n"
  89 #ifdef HAVE_LINUX
  90                         "  -t, --tun               Use a tun device instead of stdio.\n"
  91 #endif
  92                         "  -w, --writeonly         Only send data from stdin to the socket.\n"
  93                         "  -L, --packet-loss RATE  Fake packet loss of RATE percent.\n"
  94                         "  -R, --replay-window N   Set replay window to N bytes.\n"
  95                         "  -s, --special           Enable special handling of lines starting with #, ^ and $.\n"
  96                         "  -v, --verbose           Display debug messages.\n"
  97                         "  -4                      Use IPv4.\n"
  98                         "  -6                      Use IPv6.\n"
  99                         "\n");
 100         fprintf(stderr, "Report bugs to tinc@tinc-vpn.org.\n");
 101 }
 102
 103 int main(int argc, char *argv[]) {
 104         program_name = argv[0];
 105         bool initiator = false;
 106         bool datagram = false;
 107 #ifdef HAVE_LINUX
 108         bool tun = false;
 109 #endif
 110         int packetloss = 0;
 111         int r;
 112         int option_index = 0;
 113         ecdsa_t *mykey = NULL, *hiskey = NULL;
 114         bool quit = false;
 115
 116         while((r = getopt_long(argc, argv, "dqrstwL:W:v46", long_options, &option_index)) != EOF) {
 117                 switch (r) {
 118                         case 0:   /* long option */
 119                                 break;
 120
 121                         case 'd': /* datagram mode */
 122                                 datagram = true;
 123                                 break;
 124
 125                         case 'q': /* close connection on EOF from stdin */
 126                                 quit = true;
 127                                 break;
 128
 129                         case 'r': /* read only */
 130                                 readonly = true;
 131                                 break;
 132
 133                         case 't': /* read only */
 134 #ifdef HAVE_LINUX
 135                                 tun = true;
 136 #else
 137                                 fprintf(stderr, "--tun is only supported on Linux.\n");
 138                                 usage();
 139                                 return 1;
 140 #endif
 141                                 break;
 142
 143                         case 'w': /* write only */
 144                                 writeonly = true;
 145                                 break;
 146
 147                         case 'L': /* packet loss rate */
 148                                 packetloss = atoi(optarg);
 149                                 break;
 150
 151                         case 'W': /* replay window size */
 152                                 sptps_replaywin = atoi(optarg);
 153                                 break;
 154
 155                         case 'v': /* be verbose */
 156                                 verbose = true;
 157                                 break;
 158
 159                         case 's': /* special character handling */
 160                                 special = true;
 161                                 break;
 162
 163                         case '?': /* wrong options */
 164                                 usage();
 165                                 return 1;
 166
 167                         case '4': /* IPv4 */
 168                                 addressfamily = AF_INET;
 169                                 break;
 170
 171                         case '6': /* IPv6 */
 172                                 addressfamily = AF_INET6;
 173                                 break;
 174
 175                         case 1: /* help */
 176                                 usage();
 177                                 return 0;
 178
 179                         default:
 180                                 break;
 181                 }
 182         }
 183
 184         argc -= optind - 1;
 185         argv += optind - 1;
 186
 187         if(argc < 4 || argc > 5) {
 188                 fprintf(stderr, "Wrong number of arguments.\n");
 189                 usage();
 190                 return 1;
 191         }
 192
 193         if(argc > 4)
 194                 initiator = true;
 195
 196         srand(time(NULL));
 197
 198 #ifdef HAVE_LINUX
 199         if(tun) {
 200                 in = out = open("/dev/net/tun", O_RDWR | O_NONBLOCK);
 201                 if(in < 0) {
 202                         fprintf(stderr, "Could not open tun device: %s\n", strerror(errno));
 203                         return 1;
 204                 }
 205                 struct ifreq ifr = {
 206                         .ifr_flags = IFF_TUN
 207                 };
 208                 if(ioctl(in, TUNSETIFF, &ifr)) {
 209                         fprintf(stderr, "Could not configure tun interface: %s\n", strerror(errno));
 210                         return 1;
 211                 }
 212                 ifr.ifr_name[IFNAMSIZ - 1] = 0;
 213                 fprintf(stderr, "Using tun interface %s\n", ifr.ifr_name);
 214         }
 215 #endif
 216
 217 #ifdef HAVE_MINGW
 218         static struct WSAData wsa_state;
 219         if(WSAStartup(MAKEWORD(2, 2), &wsa_state))
 220                 return 1;
 221 #endif
 222
 223         struct addrinfo *ai, hint;
 224         memset(&hint, 0, sizeof hint);
 225
 226         hint.ai_family = addressfamily;
 227         hint.ai_socktype = datagram ? SOCK_DGRAM : SOCK_STREAM;
 228         hint.ai_protocol = datagram ? IPPROTO_UDP : IPPROTO_TCP;
 229         hint.ai_flags = initiator ? 0 : AI_PASSIVE;
 230
 231         if(getaddrinfo(initiator ? argv[3] : NULL, initiator ? argv[4] : argv[3], &hint, &ai) || !ai) {
 232                 fprintf(stderr, "getaddrinfo() failed: %s\n", sockstrerror(sockerrno));
 233                 return 1;
 234         }
 235
 236         int sock = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol);
 237         if(sock < 0) {
 238                 fprintf(stderr, "Could not create socket: %s\n", sockstrerror(sockerrno));
 239                 return 1;
 240         }
 241
 242         int one = 1;
 243         setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, (void *)&one, sizeof one);
 244
 245         if(initiator) {
 246                 if(connect(sock, ai->ai_addr, ai->ai_addrlen)) {
 247                         fprintf(stderr, "Could not connect to peer: %s\n", sockstrerror(sockerrno));
 248                         return 1;
 249                 }
 250                 fprintf(stderr, "Connected\n");
 251         } else {
 252                 if(bind(sock, ai->ai_addr, ai->ai_addrlen)) {
 253                         fprintf(stderr, "Could not bind socket: %s\n", sockstrerror(sockerrno));
 254                         return 1;
 255                 }
 256
 257                 if(!datagram) {
 258                         if(listen(sock, 1)) {
 259                                 fprintf(stderr, "Could not listen on socket: %s\n", sockstrerror(sockerrno));
 260                                 return 1;
 261                         }
 262                         fprintf(stderr, "Listening...\n");
 263
 264                         sock = accept(sock, NULL, NULL);
 265                         if(sock < 0) {
 266                                 fprintf(stderr, "Could not accept connection: %s\n", sockstrerror(sockerrno));
 267                                 return 1;
 268                         }
 269                 } else {
 270                         fprintf(stderr, "Listening...\n");
 271
 272                         char buf[65536];
 273                         struct sockaddr addr;
 274                         socklen_t addrlen = sizeof addr;
 275
 276                         if(recvfrom(sock, buf, sizeof buf, MSG_PEEK, &addr, &addrlen) <= 0) {
 277                                 fprintf(stderr, "Could not read from socket: %s\n", sockstrerror(sockerrno));
 278                                 return 1;
 279                         }
 280
 281                         if(connect(sock, &addr, addrlen)) {
 282                                 fprintf(stderr, "Could not accept connection: %s\n", sockstrerror(sockerrno));
 283                                 return 1;
 284                         }
 285                 }
 286
 287                 fprintf(stderr, "Connected\n");
 288         }
 289
 290         crypto_init();
 291
 292         FILE *fp = fopen(argv[1], "r");
 293         if(!fp) {
 294                 fprintf(stderr, "Could not open %s: %s\n", argv[1], strerror(errno));
 295                 return 1;
 296         }
 297         if(!(mykey = ecdsa_read_pem_private_key(fp)))
 298                 return 1;
 299         fclose(fp);
 300
 301         fp = fopen(argv[2], "r");
 302         if(!fp) {
 303                 fprintf(stderr, "Could not open %s: %s\n", argv[2], strerror(errno));
 304                 return 1;
 305         }
 306         if(!(hiskey = ecdsa_read_pem_public_key(fp)))
 307                 return 1;
 308         fclose(fp);
 309
 310         if(verbose)
 311                 fprintf(stderr, "Keys loaded\n");
 312
 313         sptps_t s;
 314         if(!sptps_start(&s, &sock, initiator, datagram, mykey, hiskey, "sptps_test", 10, send_data, receive_record))
 315                 return 1;
 316
 317         while(true) {
 318                 if(writeonly && readonly)
 319                         break;
 320
 321                 char buf[65535] = "";
 322
 323                 fd_set fds;
 324                 FD_ZERO(&fds);
 325 #ifndef HAVE_MINGW
 326                 if(!readonly && s.instate)
 327                         FD_SET(in, &fds);
 328 #endif
 329                 FD_SET(sock, &fds);
 330                 if(select(sock + 1, &fds, NULL, NULL, NULL) <= 0)
 331                         return 1;
 332
 333                 if(FD_ISSET(in, &fds)) {
 334                         ssize_t len = read(in, buf, sizeof buf);
 335                         if(len < 0) {
 336                                 fprintf(stderr, "Could not read from stdin: %s\n", strerror(errno));
 337                                 return 1;
 338                         }
 339                         if(len == 0) {
 340                                 if(quit)
 341                                         break;
 342                                 readonly = true;
 343                                 continue;
 344                         }
 345                         if(special && buf[0] == '#')
 346                                 s.outseqno = atoi(buf + 1);
 347                         if(special && buf[0] == '^')
 348                                 sptps_send_record(&s, SPTPS_HANDSHAKE, NULL, 0);
 349                         else if(special && buf[0] == '$') {
 350                                 sptps_force_kex(&s);
 351                                 if(len > 1)
 352                                         sptps_send_record(&s, 0, buf, len);
 353                         } else
 354                         if(!sptps_send_record(&s, buf[0] == '!' ? 1 : 0, buf, (len == 1 && buf[0] == '\n') ? 0 : buf[0] == '*' ? sizeof buf : len))
 355                                 return 1;
 356                 }
 357
 358                 if(FD_ISSET(sock, &fds)) {
 359                         ssize_t len = recv(sock, buf, sizeof buf, 0);
 360                         if(len < 0) {
 361                                 fprintf(stderr, "Could not read from socket: %s\n", sockstrerror(sockerrno));
 362                                 return 1;
 363                         }
 364                         if(len == 0) {
 365                                 fprintf(stderr, "Connection terminated by peer.\n");
 366                                 break;
 367                         }
 368                         if(verbose) {
 369                                 char hex[len * 2 + 1];
 370                                 bin2hex(buf, hex, len);
 371                                 fprintf(stderr, "Received %d bytes of data:\n%s\n", (int)len, hex);
 372                         }
 373                         if(packetloss && (rand() % 100) < packetloss) {
 374                                 if(verbose)
 375                                         fprintf(stderr, "Dropped.\n");
 376                                 continue;
 377                         }
 378                         char *bufp = buf;
 379                         while(len) {
 380                                 size_t done = sptps_receive_data(&s, bufp, len);
 381                                 if(!done) {
 382                                         if(!datagram)
 383                                                 return 1;
 384                                 } else {
 385                                         break;
 386                                 }
 387
 388                                 bufp += done;
 389                                 len -= done;
 390                         }
 391                 }
 392         }
 393
 394         if(!sptps_stop(&s))
 395                 return 1;
 396
 397         return 0;
 398 }