Re: using tcpcat/tcpclient bidirectionally

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On Tue, Sep 30, 2014 at 03:23:28PM +0000, [email protected] wrote:
> Hi I'm trying to use tcpcat/tcpclient as a secure and simple netcat=20
> replacement.
>=20
> At the moment netcat is used this way:
>=20
> nc 127.0.0.1 9051 < "$OUT" > "$IN" &
>=20
> This doesn't work with tcpcat:
>=20
> tcpcat 127.0.0.1 9051 < "$OUT" > "$IN" &
>=20
> How can tcpcat or tcpclient be used to do this?

You could try something like this:

tcpclient 127.0.0.1 9051 sh -c 'cat < "$OUT" >&7 & cat > "$IN" <&6; wait'

or:

tcpclient 127.0.0.1 9051 sh -c 'cat <&0 >&7 & cat <&6; wait' < "$OUT" > "$I=
N"

You probably could use some recipe using multitee, something like:

tcpclient 127.0.0.1 9051 multitee 7-1 0-6 < "$OUT" > "$IN"

What's happening here is that nc opens up the connection and then
manages all the I/O on that socket to stdout and from stdin. tcpclient
on the other hand only opens up the connection, requiring a subsidiary
program to handle the I/O. tcpcat only does the 'cat <&6' part, just
reading from the socket and never writing to it.

--=20
Bruce Guenter <[email protected]>                http://untroubled.org/

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