Simple Go Code to check if an ip is a tor exit node

torcheck.go

package torcheck

import (
	"net"
	"net/http"
	"log"
	"bufio"
	"strings"
)

var torNodes = make([]net.IP, 0)

func UpdateTorNodes() {
	resp, err := http.Get("https://check.torproject.org/exit-addresses")

	if err != nil {
		log.Panicf("Unable to update list: %v", err)
	}
	
	defer resp.Body.Close()

	for s := bufio.NewScanner(resp.Body); s.Scan(); {
		line := s.Text()

		if !strings.HasPrefix(line, "ExitAddress") {
			continue
		}

		if ip := net.ParseIP(strings.Split(line, " ")[1]); ip != nil {
			torNodes = append(torNodes, ip)
			continue
		}
	}
}

func CheckIP(ip net.IP) bool {
	for _, elem := range torNodes {
		if elem.Equal(ip) {
			return true
		}
	}

	return false
}