cidr-grep

A grep-like tool used to filter IP addresses against one or more CIDR network patterns.

I wanted a tool which I can use both as a CLI tool and a Node.js transform stream. So I've built cidr-grep, for easily doing things like that:

$ cat access.log | cidrgrep -n 192.168.1.0/27

or

$ tail -f access.log | cidrgrep -n 192.168.1.0/27

Where access.log can be, for example, an Apache, Nginx or Squid server access log.

Install

With npm:

npm install cidr-grep

If you want to use it as a CLI tool, install globally with:

npm install cidr-grep -g

Usage as a CLI tool

You can do that in two ways:

# Using it directly

$ cidrgrep -f ./fixtures/squid-access.log -f ./fixtures/apache-access.log -n 192.168.1.0/24 -n 192.168.10.0/24

# Using it with Unix pipe

$ cat fixtures/apache-access.log | cidrgrep -n 192.168.1.0/27

Usage as a Node.js stream

/**
 * Module dependencies
 */

var CidrGrepStream = require('cidr-grep');
var fs = require('fs');


fs.createReadStream(__dirname + '/fixtures/apache-access.log')
  .pipe(CidrGrepStream({ networks: '192.168.1.1/24', appendEOL: true }))
  .pipe(process.stdout);

Documentation

var cidrGrepStream = CidrGrepStream( /* options */ );

Available options are:

• networks: String|Array. Required. A network pattern written using CIDR notation, e.g.: 192.168.1.0/24 or 10.10.0.0/16.

• appendEOL: Boolean. Append an os.EOL char after each stream chunks. It's used by default in CLI mode.

License

The MIT License (MIT)

Copyright (c) 2015 Michele Pangrazzi <[email protected]>

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.