#!/bin/bash
+#
+# This is a control script to start and stop the network activity
+# listening.
-CMD=${1-start}
-NET=192.168.249
-TAP=tap0
+CONF="hourglass.conf"
+function getcfg() {
+ grep -E "\\s*[^;#]$1]\\s*=" $CONF | sed 's/.*=\s*(.*)/\1/;s/\s*$//'
+}
+
+NET="$(getcfg listener.ip)"
+TAP="$(getcfg listener.tap)"
+SET="$(getcfg ipset.table)"
cd $(dirname $0)
RULE=( ! -o $TAP -j TEE --gateway $NET.2 --oif $TAP )
case "$CMD" in
start)
+ # start the blocking rule
+ if iptables-save | grep -qs "match-set $SET" ; then
+ : # all fine
+ else
+ if ipset list $SET >& /dev/null ; then
+ : # The set exists
+ else
+ ipset create $SET hash:net
+ fi
+ iptables -A FORWARD -p tcp --dport 53 -j ACCEPT
+ iptables -A FORWARD -p udp --dport 53 -j ACCEPT
+ iptables -A FORWARD -m set --match-set $SET src -j DROP
+ fi
+ # Start the traffic listener
if ifconfig $TAP >& /dev/null ; then
echo "Already started"
else
echo $TAP not up yet
done
ifconfig $TAP $NET.1 up
+ iptables -t mangle -A FORWARD -p tcp --dport 53 -j RETURN
+ iptables -t mangle -A FORWARD -p udp --dport 53 -j RETURN
iptables -t mangle -A FORWARD ${RULE[@]}
fi
;;
else
echo "Already stopped"
fi
+ ipset flush $SET
;;
*)
echo "Unknown: $CMD"