#!/bin/sh

usage() {
	(
	echo "Usage: $0 <board-IP> [board-port [board-in-port]]"
	echo ""
	echo "If port is not specified, '6666' will be used"
	[ -z "$*" ] && exit 0
	echo ""
	echo "ERROR: $*"
	exit 1
	) 1>&2
	exit $?
}

while [ -n "$1" ] ; do
	case $1 in
		-h|--help) usage;;
		--)        break;;
		-*)        usage "Invalid option $1";;
		*)         break;;
	esac
	shift
done

ip=$1
board_out_port=${2:-6666}
board_in_port=${3:-${board_out_port}}

echo Board out port: ${board_out_port}
echo Board in port: ${board_in_port}

if [ -z "${ip}" ] || [ -n "$4" ] ; then
	usage "Invalid number of arguments"
fi

for nc in socat netcat nc ; do
	type ${nc} >/dev/null 2>&1 && break
done

trap "stty icanon echo intr ^C" 0 2 3 5 10 13 15
echo "NOTE: the interrupt signal (normally ^C) has been remapped to ^T"

stty -icanon -echo intr ^T
(
if type ncb 2>/dev/null ; then
	# see if ncb is in $PATH
	exec ncb ${board_out_port}

elif [ "${nc}" = "socat" ] ; then
	# socat does support broadcast
	while ${nc} STDIO "UDP4-LISTEN:${board_out_port}"; do :; done

elif [ -x ${0%/*}/ncb ] ; then
	# maybe it's in the same dir as the netconsole script
	exec ${0%/*}/ncb ${board_out_port}

else
	# blah, just use regular netcat
	while ${nc} -u -l -p ${board_out_port} < /dev/null ; do
		:
	done
fi
) &
pid=$!
if [ "${nc}" = "socat" ] ; then
	${nc} - "UDP4:${ip}:${board_in_port}"
else
	${nc} -u ${ip} ${board_in_port}
fi
kill ${pid} 2>/dev/null