impromptu web server using netcat

[Tom Buskey]

On 1/15/07, Ric Werme <ewerme at comcast.net> wrote:
>
> Most of you are probably familiar with the ever useful TCP/IP utility
> "netcat" (often /usr/bin/nc).
>
> I'm not sure where netcat came from, I didn't hear about it until a
> year or two ago, and only tried it once or twice.


Hobbit wrote it (it's in the Fedora man pages).  Weld Pond ported it to
Windows.  They were both part of L0pht Heavy Industries (later bought by
@Stake).

Hobbit showed me this:

    A    B
     \  /
      C

ex:
        a=51001
        b=51002

On C connect to A and B:
        ssh A -L $a:127.0.0.1:$a
        ssh B -L $b:127.0.0.1:$b

On A (from):
        nc -lvnp $a 127.0.0.1 < file
On B (to):
        nc -lvnp $b 127.0.0.1 > file

On C (connect from | to ):
        nc -v -w 2 127.0.0.1 $a | nc -v -w2 127.0.0.1 $b


Recently, there is a GNU netcat which seems to be the version installed on
Fedora 5.  It doesn't allow -l and -p to be on the same line which seems to
be a big bug.

You get in the habit of adding the -L with a different port whenever you use
ssh.  Then you always have a port you can connect netcat to for various
things.  It runs in the encrypted tunnel and doesn't add any overhead.
TCP/IP takes care of errors in the transmission too.
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