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#!/bin/sh /etc/rc.common
START=82
ME="freifunk-p2pblock"
LOCK='/var/run/p2pblock.lock'
# helper-scripts
ipt_add() {
logger -t "$ME" "set 'iptables -I $1'"
iptables -I $1
echo "iptables -D $1" >> $LOCK
}
start() {
if [ ! -s "$LOCK" ]; then
logger -s -t "$ME" 'starting p2pblock...'
config_load network
config_get wan wan ifname
config_load freifunk_p2pblock
config_get layer7 p2pblock layer7
config_get ipp2p p2pblock ipp2p
config_get portrange p2pblock portrange
config_get blocktime p2pblock blocktime
# load modules
insmod ipt_ipp2p 2>&-
insmod ipt_layer7 2>&-
insmod ipt_recent ip_list_tot=400 ip_pkt_list_tot=3 2>&-
# create new p2p-chain
iptables -N p2pblock
# pipe all incomming FORWARD with source-/destination-port 1024-65535 throu p2p-chain
ipt_add "FORWARD -i $wan -p tcp --sport $portrange --dport $portrange -j p2pblock"
ipt_add "FORWARD -i $wan -p udp --sport $portrange --dport $portrange -j p2pblock"
# if p2p-traffic blocked 3 packages to a destination ip then block all traffic within the next 180 sec (port 1024-65535)
ipt_add "p2pblock -m recent --rdest --rcheck --name P2PBLOCK --seconds $blocktime --hitcount 3 -j DROP"
ipt_add "p2pblock -m recent --rdest --rcheck --name P2PBLOCK --seconds $blocktime --hitcount 3 -m limit --limit 1/minute -j LOG --log-prefix P2PBLOCK-DROP:"
# create layer7-rules
for proto in $layer7; do
ipt_add "p2pblock -m layer7 --l7proto $proto -m recent --rdest --set --name P2PBLOCK"
ipt_add "p2pblock -m layer7 --l7proto $proto -m limit --limit 1/minute -j LOG --log-prefix P2PBLOCK-seen-$proto:"
done
# create ipp2p-rules
for proto in $ipp2p; do
ipt_add "p2pblock -m ipp2p --$proto -m recent --rdest --set --name P2PBLOCK"
ipt_add "p2pblock -m ipp2p --$proto -m limit --limit 1/minute -j LOG --log-prefix P2PBLOCK-seen-$proto:"
done
# insert whitelisted ips
for ip in $WHITELIST; do
ipt_add "p2pblock -d $ip -j RETURN"
done
logger -s -t "$ME" 'Done.'; return 0
else
logger -s -t "$ME" 'WARNING! already running - Aborting!'; return 2
fi
}
stop() {
if [ -s "$LOCK" ]; then
logger -s -t "$ME" 'stopping p2pblock...'
# unset all rules in $LOCK-file
cat $LOCK | sed -ne '1!G;h;$p' | while read line; do
logger -t "$ME" "unset $line"
while eval $line 2>&-; do :; done
done; : > "$LOCK"
# flush and delete the p2p-chain
iptables -F p2pblock
iptables -X p2pblock
logger -s -t "$ME" 'Done.'; return 0
else
logger -s -t "$ME" 'WARNING! not running - Aborting!'; return 2
fi
}
restart() {
stop; sleep 1; start
}
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