37 lines
984 B
Bash
37 lines
984 B
Bash
#!/bin/bash
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# Establish iptables-based reverse proxy
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if [ ! -z "$1" ] && [ "$1" == "--reset" ]; then
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iptables -F -t nat
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exit $?
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fi
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if [ ! -z "$1" ] && [ "$1" == "--list" ]; then
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iptables -S -t nat
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exit $?
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fi
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if [ -z "$1" ] || [ -z "$2" ] || [ -z "$3" ]; then
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printf "Usage: $0 localport remotehost remoteport [ --local ]\n"
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printf " $0 --reset\n"
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printf " $0 --list\n"
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exit 1
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fi
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# Tell the kernel to allow forwarding packets.
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echo 1 > /proc/sys/net/ipv4/ip_forward
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# Default forwarding rule
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iptables -t nat -A PREROUTING -p tcp -m tcp --dport "$1" -j DNAT --to-destination "$2":"$3"
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# Set up masquerading if not already done
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if [ `iptables -S -t nat | grep -c '\-A POSTROUTING -j MASQUERADE'` -ne 1 ]; then
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iptables -t nat -A POSTROUTING -j MASQUERADE;
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fi
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# Handle local forwarding.
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if [ "$4" == "--local" ] || [ "$2" == "127.0.0.1" ]; then
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iptables -t nat -I OUTPUT -p tcp -o lo --dport "$1" -j REDIRECT --to-ports "$3"
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fi
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