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#!/bin/sh
# see https://github.com/nmap/nmap/issues/962 for why
# ncat doesn't cut it.
if test $# -eq 0 ; then
cat <<EOF 1>&2
Usage:
$0 -{4,6} -{udp,tcp} [-daemon] <port>
connect using TCP and EPHEM source port:
socat - TCP:192.1.2.23:7
connect using UDP and EPHEM source port:
socat - UDP:192.1.2.23:500
also specify source port et.al.:
socat - TCP:192.1.2.23:7,bind=192.1.2.45,sourceport=7
EOF
exit 1
fi
port=
version=
protocol=
daemon=false
while test $# -gt 0 ; do
case "$1" in
*:* | *.* ) echo addresses are not implemented ; exit 1 ;;
-[46] ) version=$(expr "$1" : '-\(.\)') ;;
-udp ) protocol=UDP ;;
-tcp ) protocol=TCP ;;
[0-9]* ) port=$1 ;;
-daemon ) daemon=true ;;
* ) echo "invalid option $1" 1>&2 ; exit 1 ;;
esac
shift
done
if test -z "${port}" -o -z "${protocol}" -o -z "${version}" ; then
echo "missing port, protocol or version" 1>&2
exit 1
fi
echo listening on IPv${version} ${protocol} port ${port} 1>&2
socat="socat -v ${protocol}${version}-LISTEN:${port},fork EXEC:/bin/cat"
if ${daemon} ; then
output=OUTPUT/$(hostname).echo-server.IPv${version}.${protocol}.${port}
${socat} > ${output}.log 2>&1 &
echo $? > ${output}.pid
exit 0
fi
exec ${socat}
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