Re: ncat: how to get output in connect mode (non-interactive)

[Tomas Psika <tomas.psika () gmail com>]

Thank you much David. You made it clear to me. Tomas

David Fifield napsal(a):
> On Mon, Sep 14, 2009 at 04:52:04PM +0200, Tomas Psika wrote:
> > need to know if it somehow possible to get some output when invoking
> > ncat in connect mode (client) non-interactively (with command prepared).
> >
> > $ cat test.sh
> > #!/usr/bin/env bash
> > echo -ne "GET / HTTP/1.1\n"
> > echo -ne "Host: www.google.com\n\n"
> > $ ncat -c /path/to/test.sh www.google.com 80
> > $ [nothing]
> > $ echo $?
> > 0
>
> You have to write this as
>
> ./test.sh | ncat www.google.com 80
>
> The reason is that with the -c option, Ncat totally surrenders control
> of the network connection to the invoked program, which becomes
> responsible for reading and writing. Because test.sh never reads from
> stdin, it never reads from the network when invoked by Ncat; and further
> if it did print any output it would go back over the network, not to the
> screen.
>
> For this script you will also want to use HTTP/1.0 or add a
> "Connection: close" header field so that the remote server will close
> the connection after it sends the reply. Otherwise an HTTP/1.1 server
> may keep the connection open, waiting for more requests.
>
> David Fifield


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