tcp-dump-server

A tcp server that dumps incoming bytes to the terminal. Useful for protocol debugging or reverse engineering simple TCP communication protocols.

Note: This works for simplistic one-way communication protocols (common in building / AV system automation). You're still going to need Pcap / wireshark for more complex stuff.

Install

$ npm install tcp-dump-server

Usage

import tcpDumpServer from 'tcp-dump-server';

tcpDumpServer({port, sep, hex});
// will start outputting

API

tcpDumpServer(options)

port

Type: number

The port number to listen on.

sep

Type: string

The line or command separator. Defaults to "ff" if hex flag is used, otherwise defaults to \r\n.

hex

Type: boolean
Default: false

If true, incoming bytes are printed as hex characters (and sep is matched against those hex characters). Otherwise, treated as utf8 incoded string.

emit

Type: (string) => string | null | undefined

A function to manipulate a command or line of output before printing. Output a falsy value to ignore / skip printing. Input will be a hex string (hex mode), or ASCII string (text mode). Defaults to a pretty print function for hex, and an identity function for text mode.

CLI

$ npm install --global tcp-dump-server

$ tcp-dump-server

 Options
   --hex  Is this a byte stream [Default: false]
   --port port to bind to [Default: 23]
   --sep  Separator [Default: '\r\n' for text streams, 'ff' for byte/hex streams]