func addresses(conf *dns.ClientConfig, c *dns.Client, name string) []string {
m4 := new(dns.Msg)
m4.SetQuestion(dns.Fqdn(os.Args[1]), dns.TypeA)
m6 := new(dns.Msg)
m6.SetQuestion(dns.Fqdn(os.Args[1]), dns.TypeAAAA)
addr := make(chan []string)
defer close(addr)
c.Do(m4, conf.Servers[0]+":"+conf.Port, addr, qhandler)
c.Do(m6, conf.Servers[0]+":"+conf.Port, addr, qhandler)
var ips []string
i := 2 // two outstanding queries
forever:
for {
select {
case ip := <-addr:
ips = append(ips, ip...)
i--
if i == 0 {
break forever
}
}
}
return ips
}
func main() {
conf, err := dns.ClientConfigFromFile("/etc/resolv.conf")
if len(os.Args) != 2 || err != nil {
fmt.Printf("%s DOMAIN\n", os.Args[0])
os.Exit(1)
}
m := new(dns.Msg)
m.SetQuestion(dns.Fqdn(os.Args[1]), dns.TypeDNSKEY)
m.SetEdns0(2048, true)
c := new(dns.Client)
r, _ := c.Exchange(m, conf.Servers[0]+":"+conf.Port)
if r == nil {
fmt.Printf("*** no answer received for %s\n", os.Args[1])
os.Exit(1)
}
if r.Rcode != dns.RcodeSuccess {
fmt.Printf(" *** invalid answer name %s after DNSKEY query for %s\n", os.Args[1], os.Args[1])
os.Exit(1)
}
for _, k := range r.Answer {
if key, ok := k.(*dns.RR_DNSKEY); ok {
key.Hdr.Ttl = 0
for _, alg := range []int{dns.SHA1, dns.SHA256, dns.SHA384} {
ds := key.ToDS(alg)
fmt.Printf("%v; %d\n", ds, key.Flags)
}
}
}
}
func main() {
if len(os.Args) != 2 {
fmt.Printf("%s DOMAIN\n", os.Args[0])
os.Exit(1)
}
// Error checking
config, _ := dns.ClientConfigFromFile("/etc/resolv.conf")
c := dns.NewClient()
m := new(dns.Msg)
m.SetQuestion(dns.Fqdn(os.Args[1]), dns.TypeMX)
m.MsgHdr.RecursionDesired = true
// Simple sync query, nothing fancy
r, err := c.Exchange(m, config.Servers[0]+":"+config.Port)
if err != nil {
fmt.Printf("%s\n", err.Error())
os.Exit(1)
}
if r.Rcode != dns.RcodeSuccess {
fmt.Printf(" *** invalid answer name %s after MX query for %s\n", os.Args[1], os.Args[1])
os.Exit(1)
}
// Stuff must be in the answer section
for _, a := range r.Answer {
fmt.Printf("%v\n", a)
}
}
func addresses(conf *dns.ClientConfig, c *dns.Client, name string) []string {
dns.HandleQueryFunc(os.Args[1], qhandler)
dns.ListenAndQuery(nil)
m4 := new(dns.Msg)
m4.SetQuestion(dns.Fqdn(os.Args[1]), dns.TypeA)
m6 := new(dns.Msg)
m6.SetQuestion(dns.Fqdn(os.Args[1]), dns.TypeAAAA)
c.Do(m4, conf.Servers[0]+":"+conf.Port)
c.Do(m6, conf.Servers[0]+":"+conf.Port)
var ips []string
i := 2 // two outstanding queries
forever:
for {
select {
case r := <-c.Reply:
if r.Reply != nil && r.Reply.Rcode == dns.RcodeSuccess {
for _, aa := range r.Reply.Answer {
switch aa.(type) {
case *dns.RR_A:
ips = append(ips, aa.(*dns.RR_A).A.String()+":53")
case *dns.RR_AAAA:
ips = append(ips, "["+aa.(*dns.RR_AAAA).AAAA.String()+"]:53")
}
}
} else {
fmt.Printf("Nothing recevied for %s\n", name)
}
i--
if i == 0 {
break forever
}
}
}
return ips
}
