U++ framework: U++ MT-multithreading and servers » Cant connect but dont get an error

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Re: Cant connect but dont get an error [message #39560 is a reply to message #39500]

Sat, 30 March 2013 09:47

mirek
Messages: 14291
Registered: November 2005

Ultimate Member

This is a bit more tricky than it seems - socket API (I mean, Linux/Win32, not U++ encapsulation) is highly optimized and queued, for example Connect just starts connection to the port, without actually finishing it - and OS might detect that to connection is not available a couple of operations later.

Anyway, I have tried and this seems to work:

	TcpSocket socket;
	for(int i = 1; i < 120; i++)
		LOG(i << ' ' << (socket.Timeout(2000).Connect(url, i) && socket.Wait(WAIT_WRITE) && socket.Put("\n") == 1));

Please note that scanning ports is generally considered as form of attack...

Mirek

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[Message index]

		Cant connect but dont get an error By: Brat on Sat, 23 March 2013 16:03
		Re: Cant connect but dont get an error By: mirek on Sat, 30 March 2013 09:47
		Re: Cant connect but dont get an error By: Brat on Sat, 30 March 2013 11:40

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