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|
#!/bin/bash
# ARAnyM - bridging network
# STanda (c) 2004
#
# description: TUN/TAP driver using transparent bridge networking setup
#
# dependencies: tun module, tunctl (kernel-utils),
# bridge module, brctl (bridge-utils)
#
# processname: arabridge
# chkconfig: - 62 18
# source function library
# . /etc/rc.d/init.d/functions
# TO CHANGE!!!
USER=joy
TAPS=tap0
BRIDGE=br0
NIF=eth0
LOCK=/var/lock/subsys/arabridge
# make sure grep in ifconfig output works
LC_ALL=C
# defaultroute's nif
DR_NIF=$(/sbin/route -n 2>/dev/null | awk '/^0\.0\.0\.0/ {print $8}')
DEFGW=$(/sbin/route -n 2>/dev/null | awk '/^0\.0\.0\.0/ {print $2}')
# do we have the default route NIF?
DEF_ROUTE=0
if [ -n "$DR_NIF" -a "$NIF" = "$DR_NIF" -a -n "$DEFGW" ]; then
DEF_ROUTE=1
echo "Playing with default route at $DR_NIF with gateway to $DEFGW"
fi
success()
{
echo "[OK]"
}
failure()
{
echo "[FAILED]"
}
status()
{
echo "status $1"
}
start_tap()
{
TAP="$1"
/sbin/ifconfig $TAP 1>/dev/null 2>/dev/null
if [ $? -ne 0 ]; then
echo "Creating device $TAP..."
TAP=$(tunctl -t $TAP -u $USER)
fi
}
case "$1" in
start)
echo -n "Starting TUN/TAP bridging: "
# save the NIF name
echo $NIF >$LOCK
IP=$(/sbin/ifconfig $NIF | awk '/inet addr:/ {print substr($2, 6)}')
BCAST=$(/sbin/ifconfig $NIF | awk '/inet addr:/ {print substr($3, 7)}')
NETMASK=$(/sbin/ifconfig $NIF | awk '/inet addr:/ {print substr($4, 6)}')
echo "NIF=$NIF IP=$IP, BCAST=$BCAST, NETMASK=$NETMASK, DEFGW=$DEFGW"
/sbin/modprobe tun
/sbin/modprobe bridge
echo "Changing owner of /dev/net/tun..."
[ -c /dev/net/tun ] && chown $USER /dev/net/tun
echo "Setting up bridge $BRIDGE..."
brctl addbr $BRIDGE
brctl stp $BRIDGE off
brctl setfd $BRIDGE 1
brctl sethello $BRIDGE 1
# add NIF to the bridge
ifconfig $NIF 0.0.0.0
brctl addif $BRIDGE $NIF 2>&1 | grep -qi "invalid"
if [ $? -eq 0 ]; then
echo -n "... ERROR: wrong NIF type";
failure; echo
brctl delbr $BRIDGE
rm -f $LOCK
ifconfig $NIF $IP
exit 1
fi
echo
# add all the tap devices
for tap in $TAPS; do
start_tap $tap
brctl addif $BRIDGE $tap
/sbin/ifconfig $tap 0.0.0.0 promisc up
done
# setup the bridge parameters
/sbin/ifconfig $BRIDGE $IP netmask $NETMASK broadcast $BCAST
# ifconfig needs to be called twice here after some delay
# I don't really know what is going on :(
# if not slept enough then the IP, NETMASK and BCAST setting
# are cleared 8-|
sleep 1
/sbin/ifconfig $NIF 0.0.0.0 promisc up
# bring the bridge up
/sbin/ifconfig $BRIDGE $IP netmask $NETMASK broadcast $BCAST up
if [ $DEF_ROUTE -eq 0 ]; then
/sbin/route add default dev $BRIDGE
echo "adding normal route"
else
/sbin/route add default dev $BRIDGE gw $DEFGW
echo "adding gateway route"
fi
echo
success
echo
;;
stop)
echo -n "Shutting down arabridge: "
NIF=$(cat $LOCK 2>/dev/null)
if [ -z "$NIF" ]; then
echo -n "... already stopped";
success;
echo;
exit 0
fi
echo
IP=$(/sbin/ifconfig $BRIDGE 2>/dev/null| awk '/inet addr:/ {print substr($2, 6)}')
BCAST=$(/sbin/ifconfig $BRIDGE 2>/dev/null| awk '/inet addr:/ {print substr($3, 7)}')
NETMASK=$(/sbin/ifconfig $BRIDGE 2>/dev/null| awk '/inet addr:/ {print substr($4, 6)}')
# if not slept long enough then the IP, NETMASK and BCAST setting
# are not fetched properly 8-|
sleep 1
echo "NIF=$NIF IP=$IP, BCAST=$BCAST, NETMASK=$NETMASK, DEFGW=$DEFGW"
# bring the previous network nif back
/sbin/ifconfig $NIF $IP netmask $NETMASK broadcast $BCAST up
if [ $DEF_ROUTE -eq 0 ]; then
/sbin/route add default dev $NIF
else
/sbin/route add default dev $NIF gw $DEFGW
fi
# get the bridge down
/sbin/ifconfig $BRIDGE down
for tap in $TAPS; do
brctl delif $BRIDGE $tap
/sbin/ifconfig $tap down
echo
tunctl -d $tap
done
brctl delbr $BRIDGE
rm -f $LOCK
echo
;;
restart)
$0 stop
$0 start
;;
status)
status arabridge
;;
*)
echo "Usage: arabridge {start|stop|restart|status}"
exit 1
esac
exit 0
|
