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Add -ip flag to specify resolve ip address #3

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merged 2 commits into from Dec 29, 2014
Merged

Add -ip flag to specify resolve ip address #3

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9821bee
Add -ip flag to specify resolve ip address
sosedoff Dec 28, 2014
7cc9fce
Check that IP is v4, formatting tweaks
sosedoff Dec 29, 2014
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19 changes: 17 additions & 2 deletions main.go
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Expand Up @@ -9,6 +9,8 @@ import (
"github.com/miekg/dns"
)

var resolveIP net.IP

func handleRequest(w dns.ResponseWriter, r *dns.Msg) {
q := r.Question[0]

Expand All @@ -19,7 +21,7 @@ func handleRequest(w dns.ResponseWriter, r *dns.Msg) {
m.SetReply(r)
a := new(dns.A)
a.Hdr = dns.RR_Header{Name: q.Name, Rrtype: dns.TypeA, Class: dns.ClassINET, Ttl: 600}
a.A = net.IPv4(127, 0, 0, 1)
a.A = resolveIP
m.Answer = []dns.RR{a}
w.WriteMsg(m)
log.Printf("%s (RESOLVED)\n", info)
Expand All @@ -34,10 +36,23 @@ func handleRequest(w dns.ResponseWriter, r *dns.Msg) {

func main() {
var addr = flag.String("addr", "127.0.0.1:5300", "listen address")
var ip = flag.String("ip", "127.0.0.1", "resolve ipv4 address")

flag.Parse()

resolveIP = net.ParseIP(*ip)

if resolveIP == nil {
log.Fatalf("Invalid ip address: %s\n", *ip)
}
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Perhaps add

if resolveIp.To4() == nil {
  log.Fatalf("Invalid ipv4 address: %s\n", *ip)
}


if resolveIP.To4() == nil {
log.Fatalf("Invalid ipv4 address: %s\n", *ip)
}

server := &dns.Server{Addr: *addr, Net: "udp"}
server.Handler = dns.HandlerFunc(handleRequest)
log.Printf("Listening on %s\n", *addr)

log.Printf("Listening on %s, resolving to %s\n", *addr, *ip)
log.Fatal(server.ListenAndServe())
}