git.meshlink.io Git - meshlink/blob - src/sptps_test.c

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