10 #include <sys/socket.h>
20 struct utcp_connection *c;
21 int dir = DIR_READ | DIR_WRITE;
28 long reorder_dist = 10;
38 int reorder_countdown;
41 void debug(const char *format, ...) {
43 gettimeofday(&now, NULL);
44 fprintf(stderr, "%lu.%lu ", now.tv_sec, now.tv_usec / 1000);
47 vfprintf(stderr, format, ap);
51 #define debug(...) do {} while(0)
54 ssize_t do_recv(struct utcp_connection *c, const void *data, size_t len) {
59 debug("Error: %s\n", strerror(errno));
63 debug("Connection closed by peer\n");
72 if(fread(buf, len, 1, reference) != 1) {
73 debug("Error reading reference\n");
77 if(memcmp(buf, data, len)) {
78 debug("Received data differs from reference\n");
83 return write(1, data, len);
86 void do_accept(struct utcp_connection *nc, uint16_t port) {
88 utcp_accept(nc, do_recv, NULL);
90 utcp_set_accept_cb(c->utcp, NULL, NULL);
93 ssize_t do_send(struct utcp *utcp, const void *data, size_t len) {
94 int s = *(int *)utcp->priv;
97 if(outpktno >= dropfrom && outpktno < dropto) {
98 if(drand48() < dropout) {
99 debug("Dropped outgoing packet\n");
103 if(!reorder_data && drand48() < reorder) {
104 reorder_data = malloc(len);
107 debug("Out of memory\n");
112 memcpy(reorder_data, data, len);
113 reorder_countdown = 1 + drand48() * reorder_dist;
119 if(--reorder_countdown < 0) {
120 total_out += reorder_len;
121 send(s, reorder_data, reorder_len, MSG_DONTWAIT);
128 ssize_t result = send(s, data, len, MSG_DONTWAIT);
131 debug("Error sending UDP packet: %s\n", strerror(errno));
137 static void set_mtu(struct utcp *u, int s) {
139 socklen_t optlen = sizeof(mtu);
140 getsockopt(s, IPPROTO_IP, IP_MTU, &mtu, &optlen);
143 if(!mtu || mtu == 65535) {
147 fprintf(stderr, "Using MTU %lu\n", mtu);
149 utcp_set_mtu(u, mtu ? mtu - 48 : 1300);
152 int main(int argc, char *argv[]) {
156 if(argc < 2 || argc > 3) {
160 bool server = argc == 2;
161 bool connected = false;
162 uint32_t flags = UTCP_TCP;
163 size_t read_size = 102400;
165 if(getenv("DROPIN")) {
166 dropin = atof(getenv("DROPIN"));
169 if(getenv("DROPOUT")) {
170 dropout = atof(getenv("DROPOUT"));
173 if(getenv("DROPFROM")) {
174 dropfrom = atoi(getenv("DROPFROM"));
177 if(getenv("DROPTO")) {
178 dropto = atoi(getenv("DROPTO"));
181 if(getenv("REORDER")) {
182 reorder = atof(getenv("REORDER"));
185 if(getenv("REORDER_DIST")) {
186 reorder_dist = atoi(getenv("REORDER_DIST"));
189 if(getenv("FLAGS")) {
190 flags = atoi(getenv("FLAGS"));
193 if(getenv("READ_SIZE")) {
194 read_size = atoi(getenv("READ_SIZE"));
198 mtu = atoi(getenv("MTU"));
201 char *reference_filename = getenv("REFERENCE");
203 if(reference_filename) {
204 reference = fopen(reference_filename, "r");
207 if(dropto < dropfrom) {
213 struct addrinfo hint = {
214 .ai_flags = server ? AI_PASSIVE : 0,
215 .ai_socktype = SOCK_DGRAM,
218 getaddrinfo(server ? NULL : argv[1], server ? argv[1] : argv[2], &hint, &ai);
221 debug("Could not lookup address: %s\n", strerror(errno));
225 int s = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol);
228 debug("Could not create socket: %s\n", strerror(errno));
232 static const int one = 1;
233 setsockopt(s, SOL_SOCKET, SO_REUSEADDR, &one, sizeof one);
236 if(bind(s, ai->ai_addr, ai->ai_addrlen)) {
237 debug("Could not bind: %s\n", strerror(errno));
241 if(connect(s, ai->ai_addr, ai->ai_addrlen)) {
242 debug("Could not connect: %s\n", strerror(errno));
251 struct utcp *u = utcp_init(server ? do_accept : NULL, NULL, do_send, &s);
254 debug("Could not initialize UTCP\n");
258 utcp_set_user_timeout(u, 10);
262 c = utcp_connect_ex(u, 1, do_recv, NULL, flags);
265 struct pollfd fds[2] = {
266 {.fd = 0, .events = POLLIN | POLLERR | POLLHUP},
267 {.fd = s, .events = POLLIN | POLLERR | POLLHUP},
272 struct timeval timeout = utcp_timeout(u);
274 while(!connected || utcp_is_active(u)) {
275 size_t max = c ? utcp_get_sndbuf_free(c) : 0;
277 if(max > sizeof(buf)) {
281 if(max > read_size) {
285 int timeout_ms = timeout.tv_sec * 1000 + timeout.tv_usec / 1000 + 1;
287 debug("polling, dir = %d, timeout = %d\n", dir, timeout_ms);
289 if((dir & DIR_READ) && max) {
290 poll(fds, 2, timeout_ms);
292 poll(fds + 1, 1, timeout_ms);
298 ssize_t len = read(0, buf, max);
305 utcp_shutdown(c, SHUT_WR);
316 ssize_t sent = utcp_send(c, buf, len);
319 debug("Short send: %zd != %zd\n", sent, len);
327 struct sockaddr_storage ss;
328 socklen_t sl = sizeof(ss);
329 int len = recvfrom(s, buf, sizeof(buf), MSG_DONTWAIT, (struct sockaddr *)&ss, &sl);
332 debug("Error receiving UDP packet: %s\n", strerror(errno));
337 if(!connect(s, (struct sockaddr *)&ss, sl)) {
345 if(inpktno >= dropto || inpktno < dropfrom || drand48() >= dropin) {
348 if(utcp_recv(u, buf, len) == -1) {
349 debug("Error receiving UTCP packet: %s\n", strerror(errno));
352 debug("Dropped incoming packet\n");
356 timeout = utcp_timeout(u);
365 debug("Total bytes in: %ld, out: %ld\n", total_in, total_out);