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 MAX(a, b) ((a) > (b) ? (a) : (b))
42 #define closesocket(s) close(s)
45 // Symbols necessary to link with logger.o
46 bool send_request(void *c, const char *msg, ...) {
52 struct list_t *connection_list = NULL;
54 bool send_meta(void *c, const char *msg, int len) {
61 char *logfilename = NULL;
62 bool do_detach = false;
68 static bool writeonly;
71 static int addressfamily = AF_UNSPEC;
73 static bool send_data(void *handle, uint8_t type, const void *data, size_t len) {
75 char hex[len * 2 + 1];
76 bin2hex(data, hex, len);
79 fprintf(stderr, "Sending %zu bytes of data:\n%s\n", len, hex);
82 const int *sock = handle;
84 if((size_t)send(*sock, data, len, 0) != len) {
91 static bool receive_record(void *handle, uint8_t type, const void *data, uint16_t len) {
95 fprintf(stderr, "Received type %d record of %u bytes:\n", type, len);
99 write(out, data, len);
105 static struct option const long_options[] = {
106 {"datagram", no_argument, NULL, 'd'},
107 {"quit", no_argument, NULL, 'q'},
108 {"readonly", no_argument, NULL, 'r'},
109 {"writeonly", no_argument, NULL, 'w'},
110 {"packet-loss", required_argument, NULL, 'L'},
111 {"replay-window", required_argument, NULL, 'W'},
112 {"special", no_argument, NULL, 's'},
113 {"verbose", required_argument, NULL, 'v'},
114 {"help", no_argument, NULL, 1},
118 const char *program_name;
120 static void usage() {
121 fprintf(stderr, "Usage: %s [options] my_ed25519_key_file his_ed25519_key_file [host] port\n\n", program_name);
122 fprintf(stderr, "Valid options are:\n"
123 " -d, --datagram Enable datagram mode.\n"
124 " -q, --quit Quit when EOF occurs on stdin.\n"
125 " -r, --readonly Only send data from the socket to stdout.\n"
127 " -t, --tun Use a tun device instead of stdio.\n"
129 " -w, --writeonly Only send data from stdin to the socket.\n"
130 " -L, --packet-loss RATE Fake packet loss of RATE percent.\n"
131 " -R, --replay-window N Set replay window to N bytes.\n"
132 " -s, --special Enable special handling of lines starting with #, ^ and $.\n"
133 " -v, --verbose Display debug messages.\n"
137 fprintf(stderr, "Report bugs to tinc@tinc-vpn.org.\n");
142 int stdin_sock_fd = -1;
144 // Windows does not allow calling select() on anything but sockets. Therefore,
145 // to keep the same code as on other operating systems, we have to put a
146 // separate thread between the stdin and the sptps loop way below. This thread
147 // reads stdin and sends its content to the main thread through a TCP socket,
148 // which can be properly select()'ed.
149 void *stdin_reader_thread(void *arg) {
150 struct sockaddr_in sa;
151 socklen_t sa_size = sizeof(sa);
154 int peer_fd = accept(stdin_sock_fd, (struct sockaddr *) &sa, &sa_size);
157 fprintf(stderr, "accept() failed: %s\n", strerror(errno));
162 fprintf(stderr, "New connection received from :%d\n", ntohs(sa.sin_port));
168 while((nread = read(STDIN_FILENO, buf, sizeof(buf))) > 0) {
170 fprintf(stderr, "Read %lld bytes from input\n", nread);
173 uint8_t *start = buf;
174 ssize_t nleft = nread;
177 ssize_t nsend = send(peer_fd, start, nleft, 0);
180 if(sockwouldblock(sockerrno)) {
192 fprintf(stderr, "Could not send data: %s\n", strerror(errno));
197 fprintf(stderr, "Sent %lld bytes to peer\n", nread);
201 closesocket(peer_fd);
204 closesocket(stdin_sock_fd);
208 int start_input_reader() {
209 if(stdin_sock_fd != -1) {
210 fprintf(stderr, "stdin thread can only be started once.\n");
214 stdin_sock_fd = socket(AF_INET, SOCK_STREAM, 0);
216 if(stdin_sock_fd < 0) {
217 fprintf(stderr, "Could not create server socket: %s\n", strerror(errno));
221 struct sockaddr_in serv_sa;
223 memset(&serv_sa, 0, sizeof(serv_sa));
225 serv_sa.sin_family = AF_INET;
227 serv_sa.sin_addr.s_addr = htonl(0x7f000001); // 127.0.0.1
229 int res = bind(stdin_sock_fd, (struct sockaddr *)&serv_sa, sizeof(serv_sa));
232 fprintf(stderr, "Could not bind socket: %s\n", strerror(errno));
236 if(listen(stdin_sock_fd, 1) < 0) {
237 fprintf(stderr, "Could not listen: %s\n", strerror(errno));
241 struct sockaddr_in connect_sa;
243 socklen_t addr_len = sizeof(connect_sa);
245 if(getsockname(stdin_sock_fd, (struct sockaddr *)&connect_sa, &addr_len) < 0) {
246 fprintf(stderr, "Could not determine the address of the stdin thread socket\n");
251 fprintf(stderr, "stdin thread is listening on :%d\n", ntohs(connect_sa.sin_port));
255 int err = pthread_create(&th, NULL, stdin_reader_thread, NULL);
258 fprintf(stderr, "Could not start reader thread: %s\n", strerror(err));
262 int client_fd = socket(AF_INET, SOCK_STREAM, 0);
265 fprintf(stderr, "Could not create client socket: %s\n", strerror(errno));
269 if(connect(client_fd, (struct sockaddr *)&connect_sa, sizeof(connect_sa)) < 0) {
270 fprintf(stderr, "Could not connect: %s\n", strerror(errno));
271 closesocket(client_fd);
279 if(stdin_sock_fd != -1) {
280 closesocket(stdin_sock_fd);
289 int main(int argc, char *argv[]) {
290 program_name = argv[0];
291 bool initiator = false;
292 bool datagram = false;
298 int option_index = 0;
301 while((r = getopt_long(argc, argv, "dqrstwL:W:v46", long_options, &option_index)) != EOF) {
303 case 0: /* long option */
306 case 'd': /* datagram mode */
310 case 'q': /* close connection on EOF from stdin */
314 case 'r': /* read only */
318 case 't': /* read only */
322 fprintf(stderr, "--tun is only supported on Linux.\n");
328 case 'w': /* write only */
332 case 'L': /* packet loss rate */
333 packetloss = atoi(optarg);
336 case 'W': /* replay window size */
337 sptps_replaywin = atoi(optarg);
340 case 'v': /* be verbose */
344 case 's': /* special character handling */
348 case '?': /* wrong options */
353 addressfamily = AF_INET;
357 addressfamily = AF_INET6;
372 if(argc < 4 || argc > 5) {
373 fprintf(stderr, "Wrong number of arguments.\n");
387 in = out = open("/dev/net/tun", O_RDWR | O_NONBLOCK);
390 fprintf(stderr, "Could not open tun device: %s\n", strerror(errno));
398 if(ioctl(in, TUNSETIFF, &ifr)) {
399 fprintf(stderr, "Could not configure tun interface: %s\n", strerror(errno));
403 ifr.ifr_name[IFNAMSIZ - 1] = 0;
404 fprintf(stderr, "Using tun interface %s\n", ifr.ifr_name);
410 static struct WSAData wsa_state;
412 if(WSAStartup(MAKEWORD(2, 2), &wsa_state)) {
418 struct addrinfo *ai, hint;
419 memset(&hint, 0, sizeof(hint));
421 hint.ai_family = addressfamily;
422 hint.ai_socktype = datagram ? SOCK_DGRAM : SOCK_STREAM;
423 hint.ai_protocol = datagram ? IPPROTO_UDP : IPPROTO_TCP;
424 hint.ai_flags = initiator ? 0 : AI_PASSIVE;
426 if(getaddrinfo(initiator ? argv[3] : NULL, initiator ? argv[4] : argv[3], &hint, &ai) || !ai) {
427 fprintf(stderr, "getaddrinfo() failed: %s\n", sockstrerror(sockerrno));
431 int sock = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol);
434 fprintf(stderr, "Could not create socket: %s\n", sockstrerror(sockerrno));
440 setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, (void *)&one, sizeof(one));
443 int res = connect(sock, ai->ai_addr, ai->ai_addrlen);
449 fprintf(stderr, "Could not connect to peer: %s\n", sockstrerror(sockerrno));
453 fprintf(stderr, "Connected\n");
455 int res = bind(sock, ai->ai_addr, ai->ai_addrlen);
461 fprintf(stderr, "Could not bind socket: %s\n", sockstrerror(sockerrno));
466 if(listen(sock, 1)) {
467 fprintf(stderr, "Could not listen on socket: %s\n", sockstrerror(sockerrno));
471 fprintf(stderr, "Listening...\n");
473 sock = accept(sock, NULL, NULL);
476 fprintf(stderr, "Could not accept connection: %s\n", sockstrerror(sockerrno));
480 fprintf(stderr, "Listening...\n");
483 struct sockaddr addr;
484 socklen_t addrlen = sizeof(addr);
486 if(recvfrom(sock, buf, sizeof(buf), MSG_PEEK, &addr, &addrlen) <= 0) {
487 fprintf(stderr, "Could not read from socket: %s\n", sockstrerror(sockerrno));
491 if(connect(sock, &addr, addrlen)) {
492 fprintf(stderr, "Could not accept connection: %s\n", sockstrerror(sockerrno));
497 fprintf(stderr, "Connected\n");
502 FILE *fp = fopen(argv[1], "r");
505 fprintf(stderr, "Could not open %s: %s\n", argv[1], strerror(errno));
509 ecdsa_t *mykey = NULL;
511 if(!(mykey = ecdsa_read_pem_private_key(fp))) {
517 fp = fopen(argv[2], "r");
520 fprintf(stderr, "Could not open %s: %s\n", argv[2], strerror(errno));
525 ecdsa_t *hiskey = NULL;
527 if(!(hiskey = ecdsa_read_pem_public_key(fp))) {
535 fprintf(stderr, "Keys loaded\n");
540 if(!sptps_start(&s, &sock, initiator, datagram, mykey, hiskey, "sptps_test", 10, send_data, receive_record)) {
549 in = start_input_reader();
552 fprintf(stderr, "Could not init stdin reader thread\n");
561 int max_fd = MAX(sock, in);
564 if(writeonly && readonly) {
568 char buf[65535] = "";
569 size_t readsize = datagram ? 1460u : sizeof(buf);
574 if(!readonly && s.instate) {
580 if(select(max_fd + 1, &fds, NULL, NULL, NULL) <= 0) {
586 if(FD_ISSET(in, &fds)) {
588 ssize_t len = recv(in, buf, readsize, 0);
590 ssize_t len = read(in, buf, readsize);
594 fprintf(stderr, "Could not read from stdin: %s\n", strerror(errno));
602 shutdown(in, SD_SEND);
614 if(special && buf[0] == '#') {
615 s.outseqno = atoi(buf + 1);
618 if(special && buf[0] == '^') {
619 sptps_send_record(&s, SPTPS_HANDSHAKE, NULL, 0);
620 } else if(special && buf[0] == '$') {
624 sptps_send_record(&s, 0, buf, len);
626 } else if(!sptps_send_record(&s, buf[0] == '!' ? 1 : 0, buf, (len == 1 && buf[0] == '\n') ? 0 : buf[0] == '*' ? sizeof(buf) : (size_t)len)) {
633 if(FD_ISSET(sock, &fds)) {
634 ssize_t len = recv(sock, buf, sizeof(buf), 0);
637 fprintf(stderr, "Could not read from socket: %s\n", sockstrerror(sockerrno));
644 fprintf(stderr, "Connection terminated by peer.\n");
649 char hex[len * 2 + 1];
650 bin2hex(buf, hex, len);
651 fprintf(stderr, "Received %zd bytes of data:\n%s\n", len, hex);
654 if(packetloss && (rand() % 100) < packetloss) {
656 fprintf(stderr, "Dropped.\n");
665 size_t done = sptps_receive_data(&s, bufp, len);
676 len -= (ssize_t) done;
681 bool stopped = sptps_stop(&s);