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79 lines
2.1 KiB
79 lines
2.1 KiB
#!/usr/bin/env bash
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DIR=$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )
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source $DIR/env.sh
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if [[ ! -e $IPTABLES ]]; then
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touch $IPTABLES
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fi
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if [[ ! -e $IPTABLES ]] || [[ ! -r $IPTABLES ]] || [[ ! -w $IPTABLES ]]; then
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echo "$IPTABLES is not exist or not accessible (are you root?)"
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exit 1
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fi
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IP=$(ip addr | grep 'inet' | grep -v inet6 | grep -vE '127\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}' | grep -o -E '[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}' | head -1)
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if [[ "$IP" = "" ]]; then
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IP=$(wget -4qO- "http://whatismyip.akamai.com/")
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fi
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# backup and remove rules with $LOCALIP
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iptables-save > $IPTABLES.backup
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IFS=$'\n'
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iptablesclear=$(iptables -S -t nat | sed -n -e '/$LOCALPREFIX/p' | sed -e 's/-A/-D/g')
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for line in $iptablesclear
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do
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cmd="iptables -t nat $line"
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eval $cmd
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done
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# detect default gateway interface
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echo "Found next network interfaces:"
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ifconfig -a | sed 's/[ \t].*//;/^\(lo\|\)$/d'
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echo
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GATE=$(route | grep '^default' | grep -o '[^ ]*$')
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read -p "Enter your external network interface: " -i $GATE -e GATE
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STATIC="yes"
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read -p "Your external IP is $IP. Is this IP static? [yes] " ANSIP
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: ${ANSIP:=$STATIC}
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if [ "$STATIC" == "$ANSIP" ]; then
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# SNAT
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iptables -t nat -A POSTROUTING -s $LOCALIPMASK -o $GATE -j SNAT --to-source $IP
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else
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# MASQUERADE
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iptables -t nat -A POSTROUTING -o $GATE -j MASQUERADE
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fi
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DROP="yes"
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read -p "Would you want to disable client-to-client routing? [yes] " ANSDROP
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: ${ANSDROP:=$DROP}
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if [ "$DROP" == "$ANSDROP" ]; then
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# disable forwarding
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iptables -I FORWARD -s $LOCALIPMASK -d $LOCALIPMASK -j DROP
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else
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echo "Deleting DROP rule if exists..."
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iptables -D FORWARD -s $LOCALIPMASK -d $LOCALIPMASK -j DROP
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fi
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# MSS Clamping
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iptables -t mangle -A FORWARD -p tcp -m tcp --tcp-flags SYN,RST SYN -j TCPMSS --clamp-mss-to-pmtu
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# PPP
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iptables -A INPUT -i ppp+ -j ACCEPT
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iptables -A OUTPUT -o ppp+ -j ACCEPT
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# PPTP
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iptables -A INPUT -p tcp --dport 1723 -j ACCEPT
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# GRE
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iptables -A INPUT -p 47 -j ACCEPT
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iptables -A OUTPUT -p 47 -j ACCEPT
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iptables-save | awk '($0 !~ /^-A/)||!($0 in a) {a[$0];print}' > $IPTABLES
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iptables -F
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iptables-restore < $IPTABLES
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