nc.js

A simplified nc(netcat)

Why i made it

• On Windows, nc/ncat/socat.exe can not be trusted because they are not signed.
• I want a prototype so can be easily modified to do more works such as dump, analyse data.
• I want to see connection info CLEARLY which almost not provided by nc/ncat/socat.
• I want the TCP server send data to all clients (like broadcast)
• I don't want to remember complicated arguments for socat, and also nc which are distribution-dependent.

Usage

(You can install it by npm install -g nc.js)

• TCP Server

  nc-listen.js [localAddress:]port
  nc-listen.js localAddress port

  • Listen at a port, wait for connection from clients.
  • Data from standard input will be send to all clients (like broadcast).
  • Data from clients will be output to standard output.

• TCP Client

  nc-connect.js [host:]port
  nc-connect.js host port

  • Connect to server
  • Data from standard input will be send to server.
  • Data from server will be output to standard output.

Samples:

• TCP-Server

  $ nc-listen.js 8888
  Using parameters {
      "localAddress": "",
      "localPort": 8888
  }
  Listening at [::]:8888
  [[::ffff:127.0.0.1]:64212] Connected from [::ffff:127.0.0.1]:64212
  ... data ...
  [[::ffff:127.0.0.1]:64212] EOF
  [[::ffff:127.0.0.1]:64212] closed

  Do not worry about the log of listening at ::(all IPv6 interfaces), as far as i'v tested, on Windows and Mac OS X, listening at :: will cause all IPv4 interfaces being listened either.(called dual-stack).

  More:

  $ nc-listen.js a.b.c:8888
  $ nc-listen.js [2001:db8:a0b:12f0::1]:8888

• TCP-Client

  $ nc-connect.js 8888
  Using parameters {
      "host": "",
      "port": 8888
  }
  Connected to 127.0.0.1:8888 source 127.0.0.1:64212
  ...
  EOF
  closed
  
  $ nc-connect.js a.b.c:8888
  $ nc-connect.js [2001:db8:a0b:12f0::1]:8888