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