02_Reverse-lookup-support.diff

In some parts of the code a reverse-lookup (e.g. "connection from xxx") is used.
An address-family independent reverse-lookup function is provided by this patch,
exploiting that a socket is described by {src addr, src port, dst addr, dst port}:
 * host_and_port(): prints host and port number of given socket,
 * local_name():    pretty-prints src-addr/src-port,
 * remote_name():   pretty-prints dst-addr/dst-port;

Signed-off-by: Gerrit Renker <gerrit@erg.abdn.ac.uk>