Socat program version: 1.8.1.0

socat is a command line based utility that establishes two
bidirectional byte streams and transfers data between them.
Because the streams can be constructed from a large set of
different types of data sinks and sources (see address types),
and because lots of address options may be applied to the
streams, socat can be used for many different purposes.

http://www.dest-unreach.org/socat/