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Tunnel TCP traffic via socat. #socat
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| #!/bin/bash | |
| PUBLIC_IP4_IFACE=eth2 | |
| LISTEN_IFACE=${PUBLIC_IP4_IFACE} | |
| listen_address=$(ip -f inet addr show dev ${LISTEN_IFACE} | grep -Po 'inet \K[\d.]+') | |
| listen_port=${1} | |
| target_host=${2} | |
| target_port=${3} | |
| if [ -z "${listen_port}" ]; then | |
| echo "${0} <listen-port> <target-host> <target-port>" && exit 1; | |
| fi | |
| if [ -z "${target_host}" ]; then | |
| echo "${0} <listen-port> <target-host> <target-port>" && exit 1; | |
| fi | |
| if [ -z "${target_port}" ]; then | |
| echo "${0} <listen-port> <target-host> <target-port>" && exit 1; | |
| fi | |
| # Test that ports is actually numbers | |
| [[ ${listen_port} -eq ${listen_port} ]] | |
| [[ ${target_port} -eq ${target_port} ]] | |
| echo " == Forwarding ${listen_address}:${listen_port} -> ${target_host}:${target_port} == " | |
| # Socat | |
| socat -d -d TCP4-LISTEN:${listen_port},bind=${listen_address},su=nobody,fork,reuseaddr TCP4:${target_host}:${target_port} |
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