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- #!/bin/bash
- HostName="google.com"
- HostPort="443"
- LocalPort="443"
- LocalIf="eth0"
- RemoteHost=`curl -o /dev/null -sSL --connect-timeout 5 --retry-delay 3 --retry 5 -w %{remote_ip} "https://${HostName}:${HostPort}"`
- [ -n "$RemoteHost" ] || exit 1
- Forward=`cat /proc/sys/net/ipv4/ip_forward`
- [ "$Forward" != "1" ] && echo "1" >/proc/sys/net/ipv4/ip_forward
- iptables -I INPUT -p tcp --dport ${LocalPort} -j ACCEPT
- iptables -t nat -A PREROUTING -p tcp -i ${LocalIf} --dport ${LocalPort} -j DNAT --to-destination ${RemoteHost}:${HostPort}
- iptables -t nat -I POSTROUTING -d ${RemoteHost} -p tcp --dport ${HostPort} -j MASQUERADE
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