10 #include <sys/socket.h>
20 struct utcp_connection *c;
21 int dir = DIR_READ | DIR_WRITE;
28 long reorder_dist = 10;
37 int reorder_countdown;
40 void debug(const char *format, ...) {
42 gettimeofday(&now, NULL);
43 fprintf(stderr, "%lu.%lu ", now.tv_sec, now.tv_usec / 1000);
46 vfprintf(stderr, format, ap);
50 #define debug(...) do {} while(0)
53 ssize_t do_recv(struct utcp_connection *c, const void *data, size_t len) {
58 debug("Error: %s\n", strerror(errno));
62 debug("Connection closed by peer\n");
71 if(fread(buf, len, 1, reference) != 1) {
72 debug("Error reading reference\n");
76 if(memcmp(buf, data, len)) {
77 debug("Received data differs from reference\n");
82 return write(1, data, len);
85 void do_accept(struct utcp_connection *nc, uint16_t port) {
87 utcp_accept(nc, do_recv, NULL);
89 utcp_set_accept_cb(c->utcp, NULL, NULL);
92 ssize_t do_send(struct utcp *utcp, const void *data, size_t len) {
93 int s = *(int *)utcp->priv;
96 if(outpktno >= dropfrom && outpktno < dropto) {
97 if(drand48() < dropout) {
98 debug("Dropped outgoing packet\n");
102 if(!reorder_data && drand48() < reorder) {
103 reorder_data = malloc(len);
106 debug("Out of memory\n");
111 memcpy(reorder_data, data, len);
112 reorder_countdown = 1 + drand48() * reorder_dist;
118 if(--reorder_countdown < 0) {
119 total_out += reorder_len;
120 send(s, reorder_data, reorder_len, MSG_DONTWAIT);
127 ssize_t result = send(s, data, len, MSG_DONTWAIT);
130 debug("Error sending UDP packet: %s\n", strerror(errno));
136 int main(int argc, char *argv[]) {
140 if(argc < 2 || argc > 3) {
144 bool server = argc == 2;
145 bool connected = false;
146 uint32_t flags = UTCP_TCP;
147 size_t read_size = 102400;
149 if(getenv("DROPIN")) {
150 dropin = atof(getenv("DROPIN"));
153 if(getenv("DROPOUT")) {
154 dropout = atof(getenv("DROPOUT"));
157 if(getenv("DROPFROM")) {
158 dropfrom = atoi(getenv("DROPFROM"));
161 if(getenv("DROPTO")) {
162 dropto = atoi(getenv("DROPTO"));
165 if(getenv("REORDER")) {
166 reorder = atof(getenv("REORDER"));
169 if(getenv("REORDER_DIST")) {
170 reorder_dist = atoi(getenv("REORDER_DIST"));
173 if(getenv("FLAGS")) {
174 flags = atoi(getenv("FLAGS"));
177 if(getenv("READ_SIZE")) {
178 read_size = atoi(getenv("READ_SIZE"));
181 char *reference_filename = getenv("REFERENCE");
183 if(reference_filename) {
184 reference = fopen(reference_filename, "r");
187 if(dropto < dropfrom) {
193 struct addrinfo hint = {
194 .ai_flags = server ? AI_PASSIVE : 0,
195 .ai_socktype = SOCK_DGRAM,
198 getaddrinfo(server ? NULL : argv[1], server ? argv[1] : argv[2], &hint, &ai);
201 debug("Could not lookup address: %s\n", strerror(errno));
205 int s = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol);
208 debug("Could not create socket: %s\n", strerror(errno));
212 static const int one = 1;
213 setsockopt(s, SOL_SOCKET, SO_REUSEADDR, &one, sizeof one);
216 if(bind(s, ai->ai_addr, ai->ai_addrlen)) {
217 debug("Could not bind: %s\n", strerror(errno));
221 if(connect(s, ai->ai_addr, ai->ai_addrlen)) {
222 debug("Could not connect: %s\n", strerror(errno));
231 struct utcp *u = utcp_init(server ? do_accept : NULL, NULL, do_send, &s);
234 debug("Could not initialize UTCP\n");
238 utcp_set_mtu(u, 1300);
239 utcp_set_user_timeout(u, 10);
242 c = utcp_connect_ex(u, 1, do_recv, NULL, flags);
245 struct pollfd fds[2] = {
246 {.fd = 0, .events = POLLIN | POLLERR | POLLHUP},
247 {.fd = s, .events = POLLIN | POLLERR | POLLHUP},
252 struct timeval timeout = utcp_timeout(u);
254 while(!connected || utcp_is_active(u)) {
255 size_t max = c ? utcp_get_sndbuf_free(c) : 0;
257 if(max > sizeof(buf)) {
261 if(max > read_size) {
265 int timeout_ms = timeout.tv_sec * 1000 + timeout.tv_usec / 1000 + 1;
267 debug("polling, dir = %d, timeout = %d\n", dir, timeout_ms);
269 if((dir & DIR_READ) && max) {
270 poll(fds, 2, timeout_ms);
272 poll(fds + 1, 1, timeout_ms);
278 ssize_t len = read(0, buf, max);
285 utcp_shutdown(c, SHUT_WR);
296 ssize_t sent = utcp_send(c, buf, len);
299 debug("Short send: %zd != %zd\n", sent, len);
307 struct sockaddr_storage ss;
308 socklen_t sl = sizeof(ss);
309 int len = recvfrom(s, buf, sizeof(buf), MSG_DONTWAIT, (struct sockaddr *)&ss, &sl);
312 debug("Error receiving UDP packet: %s\n", strerror(errno));
317 if(!connect(s, (struct sockaddr *)&ss, sl)) {
323 if(inpktno >= dropto || inpktno < dropfrom || drand48() >= dropin) {
326 if(utcp_recv(u, buf, len) == -1) {
327 debug("Error receiving UTCP packet: %s\n", strerror(errno));
330 debug("Dropped incoming packet\n");
334 timeout = utcp_timeout(u);
343 debug("Total bytes in: %ld, out: %ld\n", total_in, total_out);