2 sptps_test.c -- Simple Peer-to-Peer Security test program
3 Copyright (C) 2011-2014 Guus Sliepen <guus@tinc-vpn.org>
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.
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.
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.
23 #include <linux/if_tun.h>
38 #define closesocket(s) close(s)
41 // Symbols necessary to link with logger.o
42 bool send_request(void *c, const char *msg, ...) {
48 struct list_t *connection_list = NULL;
50 bool send_meta(void *c, const char *msg, int len) {
57 char *logfilename = NULL;
58 bool do_detach = false;
64 static bool writeonly;
67 static int addressfamily = AF_UNSPEC;
69 static bool send_data(void *handle, uint8_t type, const void *data, size_t len) {
71 char hex[len * 2 + 1];
72 bin2hex(data, hex, len);
75 fprintf(stderr, "Sending %zu bytes of data:\n%s\n", len, hex);
78 const int *sock = handle;
80 if((size_t)send(*sock, data, len, 0) != len) {
87 static bool receive_record(void *handle, uint8_t type, const void *data, uint16_t len) {
91 fprintf(stderr, "Received type %d record of %u bytes:\n", type, len);
95 write(out, data, len);
101 static struct option const long_options[] = {
102 {"datagram", no_argument, NULL, 'd'},
103 {"quit", no_argument, NULL, 'q'},
104 {"readonly", no_argument, NULL, 'r'},
105 {"writeonly", no_argument, NULL, 'w'},
106 {"packet-loss", required_argument, NULL, 'L'},
107 {"replay-window", required_argument, NULL, 'W'},
108 {"special", no_argument, NULL, 's'},
109 {"verbose", required_argument, NULL, 'v'},
110 {"help", no_argument, NULL, 1},
114 const char *program_name;
116 static void usage() {
117 fprintf(stderr, "Usage: %s [options] my_ed25519_key_file his_ed25519_key_file [host] port\n\n", program_name);
118 fprintf(stderr, "Valid options are:\n"
119 " -d, --datagram Enable datagram mode.\n"
120 " -q, --quit Quit when EOF occurs on stdin.\n"
121 " -r, --readonly Only send data from the socket to stdout.\n"
123 " -t, --tun Use a tun device instead of stdio.\n"
125 " -w, --writeonly Only send data from stdin to the socket.\n"
126 " -L, --packet-loss RATE Fake packet loss of RATE percent.\n"
127 " -R, --replay-window N Set replay window to N bytes.\n"
128 " -s, --special Enable special handling of lines starting with #, ^ and $.\n"
129 " -v, --verbose Display debug messages.\n"
133 fprintf(stderr, "Report bugs to tinc@tinc-vpn.org.\n");
138 int stdin_sock_fd = -1;
140 // Windows does not allow calling select() on anything but sockets. Therefore,
141 // to keep the same code as on other operating systems, we have to put a
142 // separate thread between the stdin and the sptps loop way below. This thread
143 // reads stdin and sends its content to the main thread through a TCP socket,
144 // which can be properly select()'ed.
145 void *stdin_reader_thread(void *arg) {
146 struct sockaddr_in sa;
147 socklen_t sa_size = sizeof(sa);
150 int peer_fd = accept(stdin_sock_fd, (struct sockaddr *) &sa, &sa_size);
153 fprintf(stderr, "accept() failed: %s\n", strerror(errno));
158 fprintf(stderr, "New connection received from :%d\n", ntohs(sa.sin_port));
164 while((nread = read(STDIN_FILENO, buf, sizeof(buf))) > 0) {
166 fprintf(stderr, "Read %lld bytes from input\n", nread);
169 uint8_t *start = buf;
170 ssize_t nleft = nread;
173 ssize_t nsend = send(peer_fd, start, nleft, 0);
176 if(sockwouldblock(sockerrno)) {
188 fprintf(stderr, "Could not send data: %s\n", strerror(errno));
193 fprintf(stderr, "Sent %lld bytes to peer\n", nread);
197 closesocket(peer_fd);
200 closesocket(stdin_sock_fd);
204 int start_input_reader() {
205 if(stdin_sock_fd != -1) {
206 fprintf(stderr, "stdin thread can only be started once.\n");
210 stdin_sock_fd = socket(AF_INET, SOCK_STREAM, 0);
212 if(stdin_sock_fd < 0) {
213 fprintf(stderr, "Could not create server socket: %s\n", strerror(errno));
217 struct sockaddr_in serv_sa;
219 memset(&serv_sa, 0, sizeof(serv_sa));
221 serv_sa.sin_family = AF_INET;
223 serv_sa.sin_addr.s_addr = htonl(0x7f000001); // 127.0.0.1
225 int res = bind(stdin_sock_fd, (struct sockaddr *)&serv_sa, sizeof(serv_sa));
228 fprintf(stderr, "Could not bind socket: %s\n", strerror(errno));
232 if(listen(stdin_sock_fd, 1) < 0) {
233 fprintf(stderr, "Could not listen: %s\n", strerror(errno));
237 struct sockaddr_in connect_sa;
239 socklen_t addr_len = sizeof(connect_sa);
241 if(getsockname(stdin_sock_fd, (struct sockaddr *)&connect_sa, &addr_len) < 0) {
242 fprintf(stderr, "Could not determine the address of the stdin thread socket\n");
247 fprintf(stderr, "stdin thread is listening on :%d\n", ntohs(connect_sa.sin_port));
251 int err = pthread_create(&th, NULL, stdin_reader_thread, NULL);
254 fprintf(stderr, "Could not start reader thread: %s\n", strerror(err));
258 int client_fd = socket(AF_INET, SOCK_STREAM, 0);
261 fprintf(stderr, "Could not create client socket: %s\n", strerror(errno));
265 if(connect(client_fd, (struct sockaddr *)&connect_sa, sizeof(connect_sa)) < 0) {
266 fprintf(stderr, "Could not connect: %s\n", strerror(errno));
267 closesocket(client_fd);
275 if(stdin_sock_fd != -1) {
276 closesocket(stdin_sock_fd);
285 int main(int argc, char *argv[]) {
286 program_name = argv[0];
287 bool initiator = false;
288 bool datagram = false;
294 int option_index = 0;
297 while((r = getopt_long(argc, argv, "dqrstwL:W:v46", long_options, &option_index)) != EOF) {
299 case 0: /* long option */
302 case 'd': /* datagram mode */
306 case 'q': /* close connection on EOF from stdin */
310 case 'r': /* read only */
314 case 't': /* read only */
318 fprintf(stderr, "--tun is only supported on Linux.\n");
324 case 'w': /* write only */
328 case 'L': /* packet loss rate */
329 packetloss = atoi(optarg);
332 case 'W': /* replay window size */
333 sptps_replaywin = atoi(optarg);
336 case 'v': /* be verbose */
340 case 's': /* special character handling */
344 case '?': /* wrong options */
349 addressfamily = AF_INET;
353 addressfamily = AF_INET6;
368 if(argc < 4 || argc > 5) {
369 fprintf(stderr, "Wrong number of arguments.\n");
381 in = out = open("/dev/net/tun", O_RDWR | O_NONBLOCK);
384 fprintf(stderr, "Could not open tun device: %s\n", strerror(errno));
392 if(ioctl(in, TUNSETIFF, &ifr)) {
393 fprintf(stderr, "Could not configure tun interface: %s\n", strerror(errno));
397 ifr.ifr_name[IFNAMSIZ - 1] = 0;
398 fprintf(stderr, "Using tun interface %s\n", ifr.ifr_name);
404 static struct WSAData wsa_state;
406 if(WSAStartup(MAKEWORD(2, 2), &wsa_state)) {
412 struct addrinfo *ai, hint;
413 memset(&hint, 0, sizeof(hint));
415 hint.ai_family = addressfamily;
416 hint.ai_socktype = datagram ? SOCK_DGRAM : SOCK_STREAM;
417 hint.ai_protocol = datagram ? IPPROTO_UDP : IPPROTO_TCP;
418 hint.ai_flags = initiator ? 0 : AI_PASSIVE;
420 if(getaddrinfo(initiator ? argv[3] : NULL, initiator ? argv[4] : argv[3], &hint, &ai) || !ai) {
421 fprintf(stderr, "getaddrinfo() failed: %s\n", sockstrerror(sockerrno));
425 int sock = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol);
428 fprintf(stderr, "Could not create socket: %s\n", sockstrerror(sockerrno));
434 setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, (void *)&one, sizeof(one));
437 int res = connect(sock, ai->ai_addr, ai->ai_addrlen);
443 fprintf(stderr, "Could not connect to peer: %s\n", sockstrerror(sockerrno));
447 fprintf(stderr, "Connected\n");
449 int res = bind(sock, ai->ai_addr, ai->ai_addrlen);
455 fprintf(stderr, "Could not bind socket: %s\n", sockstrerror(sockerrno));
460 if(listen(sock, 1)) {
461 fprintf(stderr, "Could not listen on socket: %s\n", sockstrerror(sockerrno));
465 fprintf(stderr, "Listening...\n");
467 sock = accept(sock, NULL, NULL);
470 fprintf(stderr, "Could not accept connection: %s\n", sockstrerror(sockerrno));
474 fprintf(stderr, "Listening...\n");
477 struct sockaddr addr;
478 socklen_t addrlen = sizeof(addr);
480 if(recvfrom(sock, buf, sizeof(buf), MSG_PEEK, &addr, &addrlen) <= 0) {
481 fprintf(stderr, "Could not read from socket: %s\n", sockstrerror(sockerrno));
485 if(connect(sock, &addr, addrlen)) {
486 fprintf(stderr, "Could not accept connection: %s\n", sockstrerror(sockerrno));
491 fprintf(stderr, "Connected\n");
497 FILE *fp = fopen(argv[1], "r");
500 fprintf(stderr, "Could not open %s: %s\n", argv[1], strerror(errno));
504 ecdsa_t *mykey = NULL;
506 if(!(mykey = ecdsa_read_pem_private_key(fp))) {
512 fp = fopen(argv[2], "r");
515 fprintf(stderr, "Could not open %s: %s\n", argv[2], strerror(errno));
520 ecdsa_t *hiskey = NULL;
522 if(!(hiskey = ecdsa_read_pem_public_key(fp))) {
530 fprintf(stderr, "Keys loaded\n");
535 if(!sptps_start(&s, &sock, initiator, datagram, mykey, hiskey, "sptps_test", 10, send_data, receive_record)) {
544 in = start_input_reader();
547 fprintf(stderr, "Could not init stdin reader thread\n");
556 int max_fd = MAX(sock, in);
559 if(writeonly && readonly) {
563 char buf[65535] = "";
564 size_t readsize = datagram ? 1460u : sizeof(buf);
569 if(!readonly && s.instate) {
575 if(select(max_fd + 1, &fds, NULL, NULL, NULL) <= 0) {
581 if(FD_ISSET(in, &fds)) {
583 ssize_t len = recv(in, buf, readsize, 0);
585 ssize_t len = read(in, buf, readsize);
589 fprintf(stderr, "Could not read from stdin: %s\n", strerror(errno));
597 shutdown(in, SD_SEND);
609 if(special && buf[0] == '#') {
610 s.outseqno = atoi(buf + 1);
613 if(special && buf[0] == '^') {
614 sptps_send_record(&s, SPTPS_HANDSHAKE, NULL, 0);
615 } else if(special && buf[0] == '$') {
619 sptps_send_record(&s, 0, buf, len);
621 } else if(!sptps_send_record(&s, buf[0] == '!' ? 1 : 0, buf, (len == 1 && buf[0] == '\n') ? 0 : buf[0] == '*' ? sizeof(buf) : (size_t)len)) {
628 if(FD_ISSET(sock, &fds)) {
629 ssize_t len = recv(sock, buf, sizeof(buf), 0);
632 fprintf(stderr, "Could not read from socket: %s\n", sockstrerror(sockerrno));
639 fprintf(stderr, "Connection terminated by peer.\n");
644 char hex[len * 2 + 1];
645 bin2hex(buf, hex, len);
646 fprintf(stderr, "Received %zd bytes of data:\n%s\n", len, hex);
649 if(packetloss && prng(100) < packetloss) {
651 fprintf(stderr, "Dropped.\n");
660 size_t done = sptps_receive_data(&s, bufp, len);
671 len -= (ssize_t) done;
676 bool stopped = sptps_stop(&s);