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103 lines
2.5 KiB
Bash
Executable File
103 lines
2.5 KiB
Bash
Executable File
#!/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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# The IP Tunnel driver requires IP forwarding to be enabled. Run as root:
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#
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# echo 1 >/proc/sys/net/ipv4/ip_forward
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#
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###########################################################################
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SUDO=/usr/bin/sudo
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IFCONFIG=/sbin/ifconfig
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IPTABLES=/sbin/iptables
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#########################################################
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[[ "x$1" = "x-n" ]] && {
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DONT_EXECUTE=yes
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shift 1
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}
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TUN_DEV=$1
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ACTION=$2
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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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# Misc Checks
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#########################################################
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[[ $# = 2 ]] || {
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echo "Usage: tunconfig [-n] iface up|down"
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exit 2
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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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[[ -x $IPTABLES ]] || {
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echo "---> $IPTABLES not found." 1>&2
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exit 1
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}
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if [ -n "$SUDO" ]; then
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$SUDO -l | grep -q "NOPASSWD: $IFCONFIG" || {
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echo "---> Missing sudo NOPASSWD: $IFCONFIG." 1>&2
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exit 1
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}
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$SUDO -l | grep -q "NOPASSWD: $IPTABLES" || {
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echo "---> Missing sudo NOPASSWD: $IPTABLES." 1>&2
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exit 1
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}
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IFCONFIG="$SUDO $IFCONFIG"
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IPTABLES="$SUDO $IPTABLES"
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fi
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[[ "x$DONT_EXECUTE" = "xyes" ]] && exit 0
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$IPTABLES -L -n -t nat > /dev/null || exit 1
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#########################################################
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# Remove old (possibly stale) ruleset
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#########################################################
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{
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$IPTABLES -t nat -D POSTROUTING -s $TUN_NET ! -d $TUN_NET -j MASQUERADE
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} >& /dev/null
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#########################################################
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# Bring down interface
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#########################################################
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[[ "$ACTION" = down ]] && {
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$IFCONFIG $TUN_DEV down
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}
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#########################################################
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# Configure interface
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#########################################################
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[[ "$ACTION" = up ]] && {
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$IFCONFIG $TUN_DEV $TUN_HOST
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# masquerade the tun network
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$IPTABLES -t nat -A POSTROUTING -s $TUN_NET ! -d $TUN_NET -j MASQUERADE
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}
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exit 0
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