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