How to create extremely simple (http) reverse proxy using netcat (nmap flavor) and a named pipe

ncatproxy.sh

    mkfifo reply
    ncat -kl 8765 < reply | ncat 127.0.0.1 4567 > reply # listens on port 8765 and redirects to localhost:4567. Runs until C-c.
    rm reply # cleanup after end

Nice! Why does this need ncat instead of nc?

ncat & nc both are same.

ncat supports -k which keep the connection open

Can this be modified, so that it connects to some port on remote server and redirects to some local port ?

Can this be modified, so that it connects to some port on remote server and redirects to some local port ?

1. Create listener on remove server port X and forward that to port Y localhost
2. on your computer create a reverse shell from server port Y to your local port Z below allow_incoming.sh making remote server 9026 to go to local port 9001

#!/bin/bash

# SERVER_IP: this is the publicly available server
SERVER_IP='test.example.com'

# SERVER_PORT: the port you want to connect to remote
SERVER_PORT='9026'

# LOCAL_IP: the IP of the local server
LOCAL_IP='127.0.0.1'

# LOCAL_PORT: The local port to forward the data to
LOCAL_PORT='9001' 

echo "forwarding $SERVER_IP:$SERVER_PORT to $LOCAL_IP:$LOCAL_PORT"

ssh -i ~/.ssh/KeyToUse -N -T -R 0.0.0.0:$SERVER_PORT:$LOCAL_IP:$LOCAL_PORT root@$SERVER_IP