go-ipset

This library is a simple GoLang wrapper to the IPtables ipset userspace utility. It provides an interface to allow Go programs to easily manipulate ipsets. It is currently limited to sets of type hash.

For ipset command documentation: http://ipset.netfilter.org/ipset.man.html

go-ipset requires ipset kernel module and userspace utility version 6.0 or greater.

Installation

Install go-ipset using the "go get" command:

go get github.com/nexus166/go-ipset/ipset

Install dependencies:

go get github.com/coreos/go-semver/semver

API Reference

Usage

import "github.com/nexus166/go-ipset/ipset

Create a new set

Construct a new IPset instance (creating the set on the fly), then use the various methods to manipulate the IPset. For example, to create a new ipset "customers" of type hash:ip for storing plain IPv4 addresses:

customers := ipset.New("customers", "hash:ip", &ipset.Params{})

To create a new ipset to store different sized IPv4 network addresses (with /mask).

trustedNetworks := ipset.New("trusted-networks", "hash:net", &ipset.Params{})

Add a single entry to the set

customers.Add("8.8.2.2")

Populate the set with IPv4 addresses (overwriting the previous content)

ips := []string{"8.8.8.8", "8.8.4.4"}
customers.Refresh(ips)

Remove a single entry from that set:

customers.Del("8.8.8.8")

Configure advanced set options

You can configure advanced options when creating a new set by supplying the parameters in the ipset.Params struct.

type Params struct {
  HashFamily string
  HashSize   int
  MaxElem    int
  Timeout    int
}

See http://ipset.netfilter.org/ipset.man.html for their meaning.

For example, to create a set whose entries will expire after 60 seconds, lets say for temporarily limiting abusive clients:

abusers := ipset.New("ratelimited", "hash:ip", &ipset.Params{Timeout: 60})

List entries of a set

// list is []string
list ipset.List("customers")