Nmap Development mailing list archives
Re: ncat's nsock vs. nmap nsock
From: Fyodor <fyodor () insecure org>
Date: Fri, 9 May 2008 21:24:43 -0700
On Fri, May 09, 2008 at 03:28:44PM +0200, mixter () gmail com wrote:
Ok... taking a second look at the strace I sent there... :) The problem is actually clear, nsock has no problems with network input, but with stdin input! dup(0) = 4, then recv(4, ...) = -1 errno ENOTSOCK means that recv() refuses to read from stdin as not being a real socket.
Good find. If nsock is not currently able to handle these different types of descriptors transparently, I think it should be improved to do so. The application calling Nsock shouldn't have to set a special flag. I'm not sure of the best way to do this though. One option would be that if recv() gives an ENOTSOCK error on a particular socket, try again with read() and set a flag to do read in the future. Nsock used to work with stdin and network sockets transparently. For example, see nsock/examples/nsock_telnet.c. That small (~250 line) sample Nsock app hasn't been updated for the latest Nsock API and so it doesn't compile. But if you find a little spare time, you might find it useful to do so. It is great for simple testing. If you do update it, please also update the Makefile to compile it and check it in. The change can go directly in /nmap/nsock/examples branch because it is already broken so it would be hard to make things worse. Cheers, -F _______________________________________________ Sent through the nmap-dev mailing list http://cgi.insecure.org/mailman/listinfo/nmap-dev Archived at http://SecLists.Org
Current thread:
- ncat's nsock vs. nmap nsock mixter () gmail com (May 08)
- Re: ncat's nsock vs. nmap nsock Fyodor (May 08)
- Re: ncat's nsock vs. nmap nsock doug (May 08)
- Re: ncat's nsock vs. nmap nsock mixter () gmail com (May 09)
- Re: ncat's nsock vs. nmap nsock mixter () gmail com (May 09)
- Re: ncat's nsock vs. nmap nsock Fyodor (May 09)
- Re: ncat's nsock vs. nmap nsock mixter () gmail com (May 10)
- Re: ncat's nsock vs. nmap nsock Fyodor (May 10)
- Re: ncat's nsock vs. nmap nsock Fyodor (May 08)