weird problem

[Unregistered]

i made a server for linux in C. when i port scan my computer it stops the server. can anyone please give me an example of some code to stop it port scanning fro mcrashing the server? thanks alot

[quzah]

The reason it's stopping there is becaues your port scanner finds something on that port. You server is likely "blocking", and so it halts waiting for input from the connection it just got. You should set your server to use non-blocking mode.

Quzah.

[beg_g]

I agree with Quzah. In addition if you really don't want your server to stop running just because of a port scan, you make it a system daemon using daemon(3) (man daemon). Then fork a child process to handle each connection that comes in. In that way, the main program (the daemon) will continue listening for connections i.e the port scan and other connections will be handled by child processes.

[Deckard]

Consider using poll() to implement a timeout. Once accept() returns with the descriptor of the new connection, call poll() with a timeout of (for example) 15 seconds. If poll times out, you can simply close() the socket. If poll indicates there is data to be read (it did not time out), you can make your call to read()/recv().

I urge you to review the poll man page.