static void *
ct_thread_main(void *aux_)
{
struct thread_aux *aux = aux_;
struct dp_packet_batch *pkt_batch;
ovs_be16 dl_type;
size_t i;
long long now = time_msec();
pkt_batch = prepare_packets(batch_size, change_conn, aux->tid, &dl_type);
ovs_barrier_block(&barrier);
for (i = 0; i < n_pkts; i += batch_size) {
conntrack_execute(ct, pkt_batch, dl_type, false, true, 0, NULL, NULL,
0, 0, NULL, NULL, now);
}
ovs_barrier_block(&barrier);
destroy_packets(pkt_batch);
return NULL;
}
int main(int argc, char *argv[])
{
int sockfd, newsockfd, portno, recvlen;
struct sockaddr_in serv_addr, cli_addr;
socklen_t clilen = sizeof(cli_addr);
struct packet receive;
FILE * f;
char * filename;
int i;
int cwndsize;
struct packet *packets;
// initialize random number generator
srand(time(NULL));
if (argc == 2) {
portno = atoi(argv[1]);
cwndsize = 1;
lossprob = 0;
corruptprob = 0;
} else if (argc < 5) {
fprintf(stderr,"usage: %s <port number> <CWnd size> <loss probability> <corruption probability>\n", argv[0]);
exit(1);
} else {
portno = atoi(argv[1]);
cwndsize = atoi(argv[2]);
lossprob = atof(argv[3]);
corruptprob = atof(argv[4]);
}
printf("CWnd size: %d\nProbLoss: %f\nProbCorrupt: %f\nServer listing on port %d...\n\n", cwndsize, lossprob, corruptprob, portno);
// create UDP socket
sockfd = socket(AF_INET, SOCK_DGRAM, 0);
if (sockfd < 0)
error("ERROR opening socket");
// fill in address info
memset((char *) &serv_addr, 0, sizeof(serv_addr)); //reset memory
serv_addr.sin_family = AF_INET;
serv_addr.sin_addr.s_addr = INADDR_ANY;
serv_addr.sin_port = htons(portno);
// bind socket to IP address and port number
if (bind(sockfd, (struct sockaddr *) &serv_addr, sizeof(serv_addr)) < 0)
error("ERROR on binding");
// scan for requests from client
while (1) {
// receieve request from client
recvlen = recvfrom(sockfd, &receive, sizeof(receive), 0, (struct sockaddr *) &cli_addr, &clilen);
if (should_lose_packet()) {
if (receive.type == TYPE_REQUEST)
printf("Simulated loss of request packet\n");
else
printf("Simulated loss of unexpected packet\n");
continue;
}
if (should_corrupt_packet()) {
if (receive.type == TYPE_REQUEST)
printf("Simulated corruption of request packet\n");
else
printf("Simulated corruption of unexpected packet\n");
continue;
}
if (corrupt(&receive)) {
printf("Received actual corrupt packet\n");
continue;
}
if (recvlen < 0)
error("ERROR receiving data from client");
printf("Received request (%d bytes) for %s\n", receive.length, receive.data);
// open file
if (receive.type == TYPE_REQUEST) {
f = fopen(receive.data, "r");
if (f == NULL)
error("ERROR opening file");
} else {
fprintf(stderr, "Packet not of type request\n");
continue;
}
packets = prepare_packets(f);
rdt_send_packets(packets, sockfd, cli_addr, clilen, cwndsize);
free(packets);
printf("Finished sending file. Listening for new request...\n\n");
}
// never reached if we never break out of the loop but whatever
close(sockfd);
return 0;
}
