ipchecking

package main

import (
	"fmt"

	"github.com/fliot/fail2ban/ipchecking"
)

func main() {
	// Parse multiple IPs/CIDRS
	ips, err := ipchecking.ParseNetIPs([]string{
		"127.0.0.1",
		"10.0.0.0/24", // 10.0.0.1-10.0.0.254
		"::1",
		"2001:db8::/32",
	})
	if err != nil {
		panic(err)
	}

	// Check if an IP is either in the list, or in the list networks
	fmt.Println(ips.Contains(""))                        // false (empty string is not an IP)
	fmt.Println(ips.Contains("127.0.0.1"))               // true
	fmt.Println(ips.Contains("127.0.0.2"))               // false
	fmt.Println(ips.Contains("10.0.0.42"))               // true
	fmt.Println(ips.Contains("::1"))                     // true
	fmt.Println(ips.Contains("2001:db8:beba:cafe::1:2")) // true
	fmt.Println(ips.Contains("64:ff9b::127.0.0.1"))      // false

}

Output:

false
true
false
true
true
true
false