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   1 /*
   2     sptps_test.c -- Simple Peer-to-Peer Security test program
   3     Copyright (C) 2011-2013 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 struct timeval now;
  39
  40 static bool verbose;
  41 static bool readonly;
  42 static bool writeonly;
  43 static int in = 0;
  44 static int out = 1;
  45
  46 static bool send_data(void *handle, uint8_t type, const char *data, size_t len) {
  47         char hex[len * 2 + 1];
  48         bin2hex(data, hex, len);
  49         if(verbose)
  50                 fprintf(stderr, "Sending %d bytes of data:\n%s\n", (int)len, hex);
  51         const int *sock = handle;
  52         if(send(*sock, data, len, 0) != len)
  53                 return false;
  54         return true;
  55 }
  56
  57 static bool receive_record(void *handle, uint8_t type, const char *data, uint16_t len) {
  58         if(verbose)
  59                 fprintf(stderr, "Received type %d record of %hu bytes:\n", type, len);
  60         if(!writeonly)
  61                 write(out, data, len);
  62         return true;
  63 }
  64
  65 static struct option const long_options[] = {
  66         {"datagram", no_argument, NULL, 'd'},
  67         {"quit", no_argument, NULL, 'q'},
  68         {"readonly", no_argument, NULL, 'r'},
  69         {"writeonly", no_argument, NULL, 'w'},
  70         {"packet-loss", required_argument, NULL, 'L'},
  71         {"replay-window", required_argument, NULL, 'W'},
  72         {"verbose", required_argument, NULL, 'v'},
  73         {"help", no_argument, NULL, 1},
  74         {NULL, 0, NULL, 0}
  75 };
  76
  77 const char *program_name;
  78
  79 static void usage() {
  80         fprintf(stderr, "Usage: %s [options] my_ecdsa_key_file his_ecdsa_key_file [host] port\n\n", program_name);
  81         fprintf(stderr, "Valid options are:\n"
  82                         "  -d, --datagram          Enable datagram mode.\n"
  83                         "  -q, --quit              Quit when EOF occurs on stdin.\n"
  84                         "  -r, --readonly          Only send data from the socket to stdout.\n"
  85 #ifdef HAVE_LINUX
  86                         "  -t, --tun               Use a tun device instead of stdio.\n"
  87 #endif
  88                         "  -w, --writeonly         Only send data from stdin to the socket.\n"
  89                         "  -L, --packet-loss RATE  Fake packet loss of RATE percent.\n"
  90                         "  -R, --replay-window N   Set replay window to N bytes.\n"
  91                         "  -v, --verbose           Display debug messages.\n"
  92                         "\n");
  93         fprintf(stderr, "Report bugs to tinc@tinc-vpn.org.\n");
  94 }
  95
  96 int main(int argc, char *argv[]) {
  97         program_name = argv[0];
  98         bool initiator = false;
  99         bool datagram = false;
 100 #ifdef HAVE_LINUX
 101         bool tun = false;
 102 #endif
 103         int packetloss = 0;
 104         int r;
 105         int option_index = 0;
 106         ecdsa_t *mykey = NULL, *hiskey = NULL;
 107         bool quit = false;
 108
 109         while((r = getopt_long(argc, argv, "dqrtwL:W:v", long_options, &option_index)) != EOF) {
 110                 switch (r) {
 111                         case 0:   /* long option */
 112                                 break;
 113
 114                         case 'd': /* datagram mode */
 115                                 datagram = true;
 116                                 break;
 117
 118                         case 'q': /* close connection on EOF from stdin */
 119                                 quit = true;
 120                                 break;
 121
 122                         case 'r': /* read only */
 123                                 readonly = true;
 124                                 break;
 125
 126                         case 't': /* read only */
 127 #ifdef HAVE_LINUX
 128                                 tun = true;
 129 #else
 130                                 fprintf(stderr, "--tun is only supported on Linux.\n");
 131                                 usage();
 132                                 return 1;
 133 #endif
 134                                 break;
 135
 136                         case 'w': /* write only */
 137                                 writeonly = true;
 138                                 break;
 139
 140                         case 'L': /* packet loss rate */
 141                                 packetloss = atoi(optarg);
 142                                 break;
 143
 144                         case 'W': /* replay window size */
 145                                 sptps_replaywin = atoi(optarg);
 146                                 break;
 147
 148                         case 'v': /* be verbose */
 149                                 verbose = true;
 150                                 break;
 151
 152                         case '?': /* wrong options */
 153                                 usage();
 154                                 return 1;
 155
 156                         case 1: /* help */
 157                                 usage();
 158                                 return 0;
 159
 160                         default:
 161                                 break;
 162                 }
 163         }
 164
 165         argc -= optind - 1;
 166         argv += optind - 1;
 167
 168         if(argc < 4 || argc > 5) {
 169                 fprintf(stderr, "Wrong number of arguments.\n");
 170                 usage();
 171                 return 1;
 172         }
 173
 174         if(argc > 4)
 175                 initiator = true;
 176
 177         srand(time(NULL));
 178
 179 #ifdef HAVE_LINUX
 180         if(tun) {
 181                 in = out = open("/dev/net/tun", O_RDWR | O_NONBLOCK);
 182                 if(in < 0) {
 183                         fprintf(stderr, "Could not open tun device: %s\n", strerror(errno));
 184                         return 1;
 185                 }
 186                 struct ifreq ifr = {
 187                         .ifr_flags = IFF_TUN
 188                 };
 189                 if(ioctl(in, TUNSETIFF, &ifr)) {
 190                         fprintf(stderr, "Could not configure tun interface: %s\n", strerror(errno));
 191                         return 1;
 192                 }
 193                 ifr.ifr_name[IFNAMSIZ - 1] = 0;
 194                 fprintf(stderr, "Using tun interface %s\n", ifr.ifr_name);
 195         }
 196 #endif
 197
 198 #ifdef HAVE_MINGW
 199         static struct WSAData wsa_state;
 200         if(WSAStartup(MAKEWORD(2, 2), &wsa_state))
 201                 return 1;
 202 #endif
 203
 204         struct addrinfo *ai, hint;
 205         memset(&hint, 0, sizeof hint);
 206
 207         hint.ai_family = AF_UNSPEC;
 208         hint.ai_socktype = datagram ? SOCK_DGRAM : SOCK_STREAM;
 209         hint.ai_protocol = datagram ? IPPROTO_UDP : IPPROTO_TCP;
 210         hint.ai_flags = initiator ? 0 : AI_PASSIVE;
 211
 212         if(getaddrinfo(initiator ? argv[3] : NULL, initiator ? argv[4] : argv[3], &hint, &ai) || !ai) {
 213                 fprintf(stderr, "getaddrinfo() failed: %s\n", strerror(errno));
 214                 return 1;
 215         }
 216
 217         int sock = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol);
 218         if(sock < 0) {
 219                 fprintf(stderr, "Could not create socket: %s\n", strerror(errno));
 220                 return 1;
 221         }
 222
 223         int one = 1;
 224         setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, (void *)&one, sizeof one);
 225
 226         if(initiator) {
 227                 if(connect(sock, ai->ai_addr, ai->ai_addrlen)) {
 228                         fprintf(stderr, "Could not connect to peer: %s\n", strerror(errno));
 229                         return 1;
 230                 }
 231                 fprintf(stderr, "Connected\n");
 232         } else {
 233                 if(bind(sock, ai->ai_addr, ai->ai_addrlen)) {
 234                         fprintf(stderr, "Could not bind socket: %s\n", strerror(errno));
 235                         return 1;
 236                 }
 237
 238                 if(!datagram) {
 239                         if(listen(sock, 1)) {
 240                                 fprintf(stderr, "Could not listen on socket: %s\n", strerror(errno));
 241                                 return 1;
 242                         }
 243                         fprintf(stderr, "Listening...\n");
 244
 245                         sock = accept(sock, NULL, NULL);
 246                         if(sock < 0) {
 247                                 fprintf(stderr, "Could not accept connection: %s\n", strerror(errno));
 248                                 return 1;
 249                         }
 250                 } else {
 251                         fprintf(stderr, "Listening...\n");
 252
 253                         char buf[65536];
 254                         struct sockaddr addr;
 255                         socklen_t addrlen = sizeof addr;
 256
 257                         if(recvfrom(sock, buf, sizeof buf, MSG_PEEK, &addr, &addrlen) <= 0) {
 258                                 fprintf(stderr, "Could not read from socket: %s\n", strerror(errno));
 259                                 return 1;
 260                         }
 261
 262                         if(connect(sock, &addr, addrlen)) {
 263                                 fprintf(stderr, "Could not accept connection: %s\n", strerror(errno));
 264                                 return 1;
 265                         }
 266                 }
 267
 268                 fprintf(stderr, "Connected\n");
 269         }
 270
 271         crypto_init();
 272
 273         FILE *fp = fopen(argv[1], "r");
 274         if(!(mykey = ecdsa_read_pem_private_key(fp)))
 275                 return 1;
 276         fclose(fp);
 277
 278         fp = fopen(argv[2], "r");
 279         if(!(hiskey = ecdsa_read_pem_public_key(fp)))
 280                 return 1;
 281         fclose(fp);
 282
 283         if(verbose)
 284                 fprintf(stderr, "Keys loaded\n");
 285
 286         sptps_t s;
 287         if(!sptps_start(&s, &sock, initiator, datagram, mykey, hiskey, "sptps_test", 10, send_data, receive_record))
 288                 return 1;
 289
 290         while(true) {
 291                 if(writeonly && readonly)
 292                         break;
 293
 294                 char buf[65535] = "";
 295
 296                 fd_set fds;
 297                 FD_ZERO(&fds);
 298 #ifndef HAVE_MINGW
 299                 if(!readonly && s.instate)
 300                         FD_SET(in, &fds);
 301 #endif
 302                 FD_SET(sock, &fds);
 303                 if(select(sock + 1, &fds, NULL, NULL, NULL) <= 0)
 304                         return 1;
 305
 306                 if(FD_ISSET(in, &fds)) {
 307                         ssize_t len = read(in, buf, sizeof buf);
 308                         if(len < 0) {
 309                                 fprintf(stderr, "Could not read from stdin: %s\n", strerror(errno));
 310                                 return 1;
 311                         }
 312                         if(len == 0) {
 313                                 if(quit)
 314                                         break;
 315                                 readonly = true;
 316                                 continue;
 317                         }
 318                         if(buf[0] == '#')
 319                                 s.outseqno = atoi(buf + 1);
 320                         if(buf[0] == '^')
 321                                 sptps_send_record(&s, SPTPS_HANDSHAKE, NULL, 0);
 322                         else if(buf[0] == '$') {
 323                                 sptps_force_kex(&s);
 324                                 if(len > 1)
 325                                         sptps_send_record(&s, 0, buf, len);
 326                         } else
 327                         if(!sptps_send_record(&s, buf[0] == '!' ? 1 : 0, buf, (len == 1 && buf[0] == '\n') ? 0 : buf[0] == '*' ? sizeof buf : len))
 328                                 return 1;
 329                 }
 330
 331                 if(FD_ISSET(sock, &fds)) {
 332                         ssize_t len = recv(sock, buf, sizeof buf, 0);
 333                         if(len < 0) {
 334                                 fprintf(stderr, "Could not read from socket: %s\n", strerror(errno));
 335                                 return 1;
 336                         }
 337                         if(len == 0) {
 338                                 fprintf(stderr, "Connection terminated by peer.\n");
 339                                 break;
 340                         }
 341                         if(verbose) {
 342                                 char hex[len * 2 + 1];
 343                                 bin2hex(buf, hex, len);
 344                                 fprintf(stderr, "Received %d bytes of data:\n%s\n", (int)len, hex);
 345                         }
 346                         if(packetloss && (rand() % 100) < packetloss) {
 347                                 if(verbose)
 348                                         fprintf(stderr, "Dropped.\n");
 349                                 continue;
 350                         }
 351                         if(!sptps_receive_data(&s, buf, len) && !datagram)
 352                                 return 1;
 353                 }
 354         }
 355
 356         if(!sptps_stop(&s))
 357                 return 1;
 358
 359         return 0;
 360 }