Raw TCP socket support

[iamgreaser]

Servers should be able to do TCP reads/writes to any server and any port.

Clients will need to whitelist servers/ports in clsave/config.json.

The suggested API is:

• sockfd = common.net_tcp_connect(hostname, port)
  • Connects to a server.
  • hostname is a string used for connecting
  • Returns nil on error.
  • Returns false if hostname + port was not whitelisted.
• common.net_tcp_close(sockfd)
  • Closes a connection.
  • DO NOT DO THIS TO A STANDARD ICEBALL CONNECTION, ONLY A RAW TCP ONE.
  • Do not do this to, e.g. stdout, either. It's stupid, and it's not even portable (but the latter point is just because Windows sucks).
• s = common.net_tcp_recv(sockfd)
  • Reads data, nonblockingly, from a socket.
  • Returns data (as a string) from the buffer if it worked.
  • Returns an empty string if the buffer was empty.
  • Returns nil on error.
  • ONLY DO THIS TO RAW TCP SOCKETS. If you do it to a standard Iceball socket, you'll ruin the queueing.
• s_remain = common.net_tcp_send(sockfd, s)
  • Writes data, nonblockingly, to a socket.
  • Returns what wasn't written to said socket (can be the whole string if it would block).
  • Returns nil on error.
  • ONLY DO THIS TO RAW TCP SOCKETS. If you do it to a standard Iceball socket, you'll ruin the queueing.

[iamgreaser]

I feel that raw UDP might be necessary as well as a TCP connect() might block the server quite nastily - it IS single-threaded, after all. No ENet stuff though. (sorry Stack.)

[iamgreaser]

TCP is implemented. Working on UDP now.

[iamgreaser]

Raw UDP is implemented. Leaving this issue open for a few days just in case it fucks out.

[iamgreaser]

Closing this issue because it's probably working and I want to feel better about 0.2's progress.