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) {
57 debug("Error: %s\n", strerror(errno));
61 debug("Connection closed by peer\n");
67 if(fread(buf, len, 1, reference) != 1) {
68 debug("Error reading reference\n");
71 if(memcmp(buf, data, len)) {
72 debug("Received data differs from reference\n");
76 return write(1, data, len);
79 void do_accept(struct utcp_connection *nc, uint16_t port) {
81 utcp_accept(nc, do_recv, NULL);
83 utcp_set_accept_cb(c->utcp, NULL, NULL);
86 ssize_t do_send(struct utcp *utcp, const void *data, size_t len) {
87 int s = *(int *)utcp->priv;
89 if(outpktno >= dropfrom && outpktno < dropto) {
90 if(drand48() < dropout) {
91 debug("Dropped outgoing packet\n");
94 if(!reorder_data && drand48() < reorder) {
95 reorder_data = malloc(len);
97 debug("Out of memory\n");
101 memcpy(reorder_data, data, len);
102 reorder_countdown = 1 + drand48() * reorder_dist;
108 if(--reorder_countdown < 0) {
109 total_out += reorder_len;
110 send(s, reorder_data, reorder_len, MSG_DONTWAIT);
117 ssize_t result = send(s, data, len, MSG_DONTWAIT);
119 debug("Error sending UDP packet: %s\n", strerror(errno));
123 int main(int argc, char *argv[]) {
127 if(argc < 2 || argc > 3)
130 bool server = argc == 2;
131 bool connected = false;
132 uint32_t flags = UTCP_TCP;
133 size_t read_size = 102400;
135 if(getenv("DROPIN")) dropin = atof(getenv("DROPIN"));
136 if(getenv("DROPOUT")) dropout = atof(getenv("DROPOUT"));
137 if(getenv("DROPFROM")) dropfrom = atoi(getenv("DROPFROM"));
138 if(getenv("DROPTO")) dropto = atoi(getenv("DROPTO"));
139 if(getenv("REORDER")) reorder = atof(getenv("REORDER"));
140 if(getenv("REORDER_DIST")) reorder_dist = atoi(getenv("REORDER_DIST"));
141 if(getenv("FLAGS")) flags = atoi(getenv("FLAGS"));
142 if(getenv("READ_SIZE")) read_size = atoi(getenv("READ_SIZE"));
144 char *reference_filename = getenv("REFERENCE");
145 if(reference_filename)
146 reference = fopen(reference_filename, "r");
148 if(dropto < dropfrom)
152 struct addrinfo hint = {
153 .ai_flags = server ? AI_PASSIVE : 0,
154 .ai_socktype = SOCK_DGRAM,
157 getaddrinfo(server ? NULL : argv[1], server ? argv[1] : argv[2], &hint, &ai);
161 int s = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol);
166 if(bind(s, ai->ai_addr, ai->ai_addrlen))
169 if(connect(s, ai->ai_addr, ai->ai_addrlen))
176 struct utcp *u = utcp_init(server ? do_accept : NULL, NULL, do_send, &s);
180 utcp_set_mtu(u, 1300);
181 utcp_set_user_timeout(u, 10);
184 c = utcp_connect_ex(u, 1, do_recv, NULL, flags);
186 struct pollfd fds[2] = {
187 {.fd = 0, .events = POLLIN | POLLERR | POLLHUP},
188 {.fd = s, .events = POLLIN | POLLERR | POLLHUP},
192 struct timeval timeout = utcp_timeout(u);
194 while(!connected || utcp_is_active(u)) {
195 size_t max = c ? utcp_get_sndbuf_free(c) : 0;
196 if(max > sizeof(buf))
201 int timeout_ms = timeout.tv_sec * 1000 + timeout.tv_usec / 1000 + 1;
203 debug("polling, dir = %d, timeout = %d\n", dir, timeout_ms);
204 if((dir & DIR_READ) && max)
205 poll(fds, 2, timeout_ms);
207 poll(fds + 1, 1, timeout_ms);
212 ssize_t len = read(0, buf, max);
217 utcp_shutdown(c, SHUT_WR);
224 ssize_t sent = utcp_send(c, buf, len);
226 debug("Short send: %zd != %zd\n", sent, len);
233 struct sockaddr_storage ss;
234 socklen_t sl = sizeof(ss);
235 int len = recvfrom(s, buf, sizeof(buf), MSG_DONTWAIT, (struct sockaddr *)&ss, &sl);
237 debug("Error receiving UDP packet: %s\n", strerror(errno));
241 if(!connect(s, (struct sockaddr *)&ss, sl))
244 if(inpktno >= dropto || inpktno < dropfrom || drand48() >= dropin) {
246 if(utcp_recv(u, buf, len) == -1)
247 debug("Error receiving UTCP packet: %s\n", strerror(errno));
249 debug("Dropped incoming packet\n");
253 timeout = utcp_timeout(u);
260 debug("Total bytes in: %ld, out: %ld\n", total_in, total_out);