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// Copyright 2011 Miek Gieben. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// An AS112 blackhole DNS server. Similar to the one found in evldns.
// Also see https://www.as112.net/
package main
import (
"github.com/miekg/dns"
"log"
"os"
"os/signal"
"runtime"
"syscall"
)
const SOA string = "@ SOA prisoner.iana.org. hostmaster.root-servers.org. 2002040800 1800 900 0604800 604800"
func NewRR(s string) dns.RR { r, _ := dns.NewRR(s); return r }
var zones = map[string]dns.RR{
"10.in-addr.arpa.": NewRR("$ORIGIN 10.in-addr.arpa.\n" + SOA),
"254.169.in-addr.arpa.": NewRR("$ORIGIN 254.169.in-addr.arpa.\n" + SOA),
"168.192.in-addr.arpa.": NewRR("$ORIGIN 168.192.in-addr.arpa.\n" + SOA),
"16.172.in-addr.arpa.": NewRR("$ORIGIN 16.172.in-addr.arpa.\n" + SOA),
"17.172.in-addr.arpa.": NewRR("$ORIGIN 17.172.in-addr.arpa.\n" + SOA),
"18.172.in-addr.arpa.": NewRR("$ORIGIN 18.172.in-addr.arpa.\n" + SOA),
"19.172.in-addr.arpa.": NewRR("$ORIGIN 19.172.in-addr.arpa.\n" + SOA),
"20.172.in-addr.arpa.": NewRR("$ORIGIN 20.172.in-addr.arpa.\n" + SOA),
"21.172.in-addr.arpa.": NewRR("$ORIGIN 21.172.in-addr.arpa.\n" + SOA),
"22.172.in-addr.arpa.": NewRR("$ORIGIN 22.172.in-addr.arpa.\n" + SOA),
"23.172.in-addr.arpa.": NewRR("$ORIGIN 23.172.in-addr.arpa.\n" + SOA),
"24.172.in-addr.arpa.": NewRR("$ORIGIN 24.172.in-addr.arpa.\n" + SOA),
"25.172.in-addr.arpa.": NewRR("$ORIGIN 25.172.in-addr.arpa.\n" + SOA),
"26.172.in-addr.arpa.": NewRR("$ORIGIN 26.172.in-addr.arpa.\n" + SOA),
"27.172.in-addr.arpa.": NewRR("$ORIGIN 27.172.in-addr.arpa.\n" + SOA),
"28.172.in-addr.arpa.": NewRR("$ORIGIN 28.172.in-addr.arpa.\n" + SOA),
"29.172.in-addr.arpa.": NewRR("$ORIGIN 29.172.in-addr.arpa.\n" + SOA),
"30.172.in-addr.arpa.": NewRR("$ORIGIN 30.172.in-addr.arpa.\n" + SOA),
"31.172.in-addr.arpa.": NewRR("$ORIGIN 31.172.in-addr.arpa.\n" + SOA),
}
func main() {
runtime.GOMAXPROCS(runtime.NumCPU() * 4)
for z, rr := range zones {
rrx := rr.(*dns.SOA) // Needed to create the actual RR, and not an reference.
dns.HandleFunc(z, func(w dns.ResponseWriter, r *dns.Msg) {
m := new(dns.Msg)
m.SetReply(r)
m.Authoritative = true
m.Ns = []dns.RR{rrx}
w.WriteMsg(m)
})
}
go func() {
err := dns.ListenAndServe(":8053", "tcp", nil)
if err != nil {
log.Fatal("Failed to set tcp listener %s\n", err.Error())
}
}()
go func() {
err := dns.ListenAndServe(":8053", "udp", nil)
if err != nil {
log.Fatal("Failed to set udp listener %s\n", err.Error())
}
}()
sig := make(chan os.Signal)
signal.Notify(sig, syscall.SIGINT, syscall.SIGTERM)
for {
select {
case s := <-sig:
log.Fatalf("Signal (%d) received, stopping\n", s)
}
}
}
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