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 int main(int argc, char *argv[]) {
141 if(argc < 2 || argc > 3) {
145 bool server = argc == 2;
146 bool connected = false;
147 uint32_t flags = UTCP_TCP;
148 size_t read_size = 102400;
150 if(getenv("DROPIN")) {
151 dropin = atof(getenv("DROPIN"));
154 if(getenv("DROPOUT")) {
155 dropout = atof(getenv("DROPOUT"));
158 if(getenv("DROPFROM")) {
159 dropfrom = atoi(getenv("DROPFROM"));
162 if(getenv("DROPTO")) {
163 dropto = atoi(getenv("DROPTO"));
166 if(getenv("REORDER")) {
167 reorder = atof(getenv("REORDER"));
170 if(getenv("REORDER_DIST")) {
171 reorder_dist = atoi(getenv("REORDER_DIST"));
174 if(getenv("FLAGS")) {
175 flags = atoi(getenv("FLAGS"));
178 if(getenv("READ_SIZE")) {
179 read_size = atoi(getenv("READ_SIZE"));
183 mtu = atoi(getenv("MTU"));
186 char *reference_filename = getenv("REFERENCE");
188 if(reference_filename) {
189 reference = fopen(reference_filename, "r");
192 if(dropto < dropfrom) {
198 struct addrinfo hint = {
199 .ai_flags = server ? AI_PASSIVE : 0,
200 .ai_socktype = SOCK_DGRAM,
203 getaddrinfo(server ? NULL : argv[1], server ? argv[1] : argv[2], &hint, &ai);
206 debug("Could not lookup address: %s\n", strerror(errno));
210 int s = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol);
213 debug("Could not create socket: %s\n", strerror(errno));
217 static const int one = 1;
218 setsockopt(s, SOL_SOCKET, SO_REUSEADDR, &one, sizeof one);
221 if(bind(s, ai->ai_addr, ai->ai_addrlen)) {
222 debug("Could not bind: %s\n", strerror(errno));
226 if(connect(s, ai->ai_addr, ai->ai_addrlen)) {
227 debug("Could not connect: %s\n", strerror(errno));
236 struct utcp *u = utcp_init(server ? do_accept : NULL, NULL, do_send, &s);
239 debug("Could not initialize UTCP\n");
243 utcp_set_mtu(u, mtu);
244 utcp_set_user_timeout(u, 10);
247 c = utcp_connect_ex(u, 1, do_recv, NULL, flags);
250 struct pollfd fds[2] = {
251 {.fd = 0, .events = POLLIN | POLLERR | POLLHUP},
252 {.fd = s, .events = POLLIN | POLLERR | POLLHUP},
257 struct timeval timeout = utcp_timeout(u);
259 while(!connected || utcp_is_active(u)) {
260 size_t max = c ? utcp_get_sndbuf_free(c) : 0;
262 if(max > sizeof(buf)) {
266 if(max > read_size) {
270 int timeout_ms = timeout.tv_sec * 1000 + timeout.tv_usec / 1000 + 1;
272 debug("polling, dir = %d, timeout = %d\n", dir, timeout_ms);
274 if((dir & DIR_READ) && max) {
275 poll(fds, 2, timeout_ms);
277 poll(fds + 1, 1, timeout_ms);
283 ssize_t len = read(0, buf, max);
290 utcp_shutdown(c, SHUT_WR);
301 ssize_t sent = utcp_send(c, buf, len);
304 debug("Short send: %zd != %zd\n", sent, len);
312 struct sockaddr_storage ss;
313 socklen_t sl = sizeof(ss);
314 int len = recvfrom(s, buf, sizeof(buf), MSG_DONTWAIT, (struct sockaddr *)&ss, &sl);
317 debug("Error receiving UDP packet: %s\n", strerror(errno));
322 if(!connect(s, (struct sockaddr *)&ss, sl)) {
328 if(inpktno >= dropto || inpktno < dropfrom || drand48() >= dropin) {
331 if(utcp_recv(u, buf, len) == -1) {
332 debug("Error receiving UTCP packet: %s\n", strerror(errno));
335 debug("Dropped incoming packet\n");
339 timeout = utcp_timeout(u);
348 debug("Total bytes in: %ld, out: %ld\n", total_in, total_out);