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#!/bin/bash |
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########################################################################### |
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# Configuration of the tunN devices for usage with Basilisk II. |
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# (derived MOL tunconfig script) |
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# |
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# This script should be named /usr/share/BasiliskII/tunconfig (unless |
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# the default name has been changed with the 'etherconfig' keyword). |
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# |
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# Usage: tunconfig iface up|down |
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# |
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# If the linux box is configured as a firewall, the rules below might |
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# need some adjustments. |
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# |
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########################################################################### |
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|
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SUDO=/usr/bin/sudo |
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IPTABLES=/sbin/iptables |
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|
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######################################################### |
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|
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TUN_DEV=$1 |
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ACTION=$2 |
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|
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TUN_NUM=`echo $TUN_DEV | sed s/[^0-9]//g` |
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NET_NUM=`expr 40 + $TUN_NUM` |
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TUN_NET=172.20.$NET_NUM.0/24 |
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TUN_HOST=172.20.$NET_NUM.1 |
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|
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######################################################### |
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# Misc Checks |
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######################################################### |
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|
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[[ $# = 2 ]] || { |
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echo "Usage: tunconfig iface up|down" |
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exit 2 |
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} |
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|
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[[ "`id -u`" = "0" ]] && { |
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echo "---> $SUDO not necessary." 1>&2 |
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SUDO="" |
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} |
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|
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[[ -x $IPTABLES ]] && { |
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IPTABLES="$SUDO $IPTABLES" |
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} || { |
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echo "---> $IPTABLES not found." 1>&2 |
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IPTABLES=/bin/true |
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} |
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|
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$IPTABLES -L -n -t nat > /dev/null || exit 1 |
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|
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######################################################### |
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# Remove old (possibly stale) ruleset |
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######################################################### |
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|
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{ |
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$IPTABLES -t nat -D POSTROUTING -s $TUN_NET -d ! $TUN_NET -j MASQUERADE |
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} >& /dev/null |
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|
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######################################################### |
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# Bring down interface |
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######################################################### |
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|
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[[ "$ACTION" = down ]] && { |
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$SUDO /sbin/ifconfig $TUN_DEV down |
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} |
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|
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######################################################### |
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# Configure interface |
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######################################################### |
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|
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[[ "$ACTION" = up ]] && { |
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$SUDO /sbin/ifconfig $TUN_DEV $TUN_HOST |
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|
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# masquerade the tun network |
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$IPTABLES -t nat -A POSTROUTING -s $TUN_NET -d ! $TUN_NET -j MASQUERADE |
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} |
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|
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exit 0 |
