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