#!/bin/sh#	Author: 	Marco Ziech (mmz@gmx.net)#	Date:		Jan-24-2000## Bnetd UDP masquerade for Linux # # NOTE:#       This script is not needed if you have "loose UDP" turned#       on.  It was a patch around the 2.2 series. It automates#       all of this for any "well behaved" peer-to-peer games,#       not just for Battle.net clients.## Kernel:# 	This script should work fine with 2.2 kernels but I don't# 	know if it works with older kernels too. ## Installation:#	Copy this file into your local init.d directory.#	The position of this directory may vary with diffrent#	linux distributions. #	On Debian/GNU Linux it's /etc/init.d#	On S.u.S.E. Linux it's /sbin/init.d		(I guess)#	To start the script on system startup you have to#	make a symlink to this file from a filename like #	"S99bnetmasq.sh" in the rc2.d directory. To stop it#	on system shutdown do the same with "K01bnetmasq.sh"#	in the rc0.d, rc1.d and rc6.d directories. These#	directories are usually in the same as the init.d#	directory.#	If you have a dial-up connection and want to start the#	script on dial-in you have to put a script which starts#	or stops this script in /etc/ppp/ip-up.d and #	/etc/ppp/ip-down.d .## Using on original Bnet:#	This script should also work with the original Battle.net.## Using on servers not running on your masquerading gateway:#       Outside servers like the real Battle.net will not#       know your correct address, only your internal IP:port.#       to fix it, either bnproxy needs to be improved to#       be used instead of ipmasq or this need to do some#       content altering like with the ftp script.#              --- Thanks to Ross Combs for these corrections.# This is the destination port on the clients. It is usually 6112.BNET_PORT=6112# This is the list of the destination hosts with their ports on# the firewall. The list should look like this:# client1IP:GW1port client2IP:GW2port ... clientNIP:GWNport# Remember that each port can only be allocated by one client.# Some ports may already be reserved by some programs.# I recomment using ports between 5000 and 7000. See # /etc/services on information about assigned ports.REDIR_LIST="192.168.1.1:5000 192.168.1.2:5001"# This is the external interface i.e. the interface which is# connected to the Internet. On dial-up links this is usually# ppp0 or ippp0 (for ISDN).EXTERNAL_IF=eth0# ------------------- END OF CONFIG SECTION -----------------# This determines the ip of the external interfaceEXTERNAL_IP=`LANGUAGE="C" LC_ALL="C" ifconfig $EXTERNAL_IF | grep 'inet addr:' | sed 's/.*inet addr:\([0-9.]*\).*/\1/g'`case "$1" in	start)		echo -n "Starting bnet masquerading: "		for i in $REDIR_LIST; do			echo -n "$i "			D_HOST="`echo $i | sed -e 's/:/ /g' | awk '{ print $1 }'`" 			D_PORT="`echo $i | sed -e 's/:/ /g' | awk '{ print $2 }'`"			ipmasqadm portfw -a -P udp -L $EXTERNAL_IP $D_PORT -R $D_HOST $BNET_PORT# FIXME: according to: http://www.mail-archive.com/masq@tori.indyramp.com/msg01538.html#> setting up a single machine would look like:#> # ipmasqadm portfw -a -P tcp -L $1 6112 -R $2 6112#> # ipmasqadm portfw -a -P tcp -L $3 6112 -R $2 6112#> # ipmasqadm portfw -a -P udp -L $1 6112 -R $2 6112#> # ipmasqadm portfw -a -P udp -L $3 6112 -R $2 6112#> Replace $1 with the internal IP address of your gateway machine, $2#> with the address (internal again, but it should be the only) of the#> machine you're playing starcraft on and $3 with the external IP ad-#> dress of the gateway machine.# This implies that# inside_gw --> client# outside_gw --> inside_gw# this script doesn't do the gw --> gw setup.... does it need to?!		done		echo "."		;;	stop)		echo -n "Stopping bnet masquerading: "		for i in $REDIR_LIST; do			echo -n "$i "			D_PORT="`echo $i | sed -e 's/:/ /g' | awk '{ print $2 }'`"			ipmasqadm portfw -d -P udp -L $EXTERNAL_IP $D_PORT		done		echo "."		;;	*)		echo "Usage: $0 {start|stop}"		exit 1		;;esac