C socket programming: connect() hangs
- by Fantastic Fourier
Hey all, I'm about to rip my hair out. I have this client that tries to connect to a server, everything seems to be fine, using gethostbyname(), socket(), bind(), but when trying toconnect()` it just hangs there and the server doesn't see anything from the client. I know that the server works because another client (also in C) can connect just fine. What causes the server to not see this incoming connection? I'm at the end of my wits here. The two different clients are pretty similar too so I'm even more lost.
if (argc == 2) {
host = argv[1]; // server address
}
else {
printf("plz read the manual\n");
exit(1);
}
hserver = gethostbyname(host);
if (hserver) {
printf("host found: %p\n", hserver);
printf("host found: %s\n", hserver->h_name );
}
else {
printf("host not found\n");
exit(1);
}
bzero((char * ) &server_address, sizeof(server_address)); // copy zeroes into string
server_address.sin_family = AF_INET;
server_address.sin_addr.s_addr = htonl(hserver->h_addr);
server_address.sin_port = htons(SERVER_PORT);
bzero((char * ) &client_address, sizeof(client_address)); // copy zeroes into string
client_address.sin_family = AF_INET;
client_address.sin_addr.s_addr = htonl(INADDR_ANY);
client_address.sin_port = htons(SERVER_PORT);
sockfd = socket(AF_INET, SOCK_STREAM, 0);
if (sockfd < 0)
exit(1);
else {
printf("socket is opened: %i \n", sockfd);
info.sock_fd = sockfd;
rv = fcntl(sockfd, F_SETFL, O_NONBLOCK); // socket set to NONBLOCK
if(rv < 0)
printf("nonblock failed: %i %s\n", errno, strerror(errno));
else
printf("socket is set nonblock\n");
}
timeout.tv_sec = 0; // seconds
timeout.tv_usec = 500000; // micro seconds ( 0.5 seconds)
setsockopt(sockfd, SOL_SOCKET, SO_RCVTIMEO, &timeout, sizeof(struct timeval));
rv = bind(sockfd, (struct sockaddr *) &client_address, sizeof(client_address));
if (rv < 0) {
printf("MAIN: ERROR bind() %i: %s\n", errno, strerror(errno));
exit(1);
}
else
printf("socket is bound\n");
rv = connect(sockfd, (struct sockaddr *) &server_address, sizeof(server_address));
printf("rv = %i\n", rv);
if (rv < 0) {
printf("MAIN: ERROR connect() %i: %s\n", errno, strerror(errno));
exit(1);
}
else
printf("connected\n");
Any thoughts or insights are deeply greatly humongously appreciated.
-Fourier
