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(os.Args[1], dns.TypeMX)
m.MsgHdr.RecursionDesired = true
// Simple sync query, nothing fancy
r := c.Exchange(m, config.Servers[0])
if r == nil {
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 main() {
if len(os.Args) != 2 {
fmt.Printf("%s NAMESERVER\n", os.Args[0])
os.Exit(1)
}
conf, _ := dns.ClientConfigFromFile("/etc/resolv.conf")
m := new(dns.Msg)
m.Question = make([]dns.Question, 1)
c := dns.NewClient()
addr := addresses(conf, c, os.Args[1])
if len(addr) == 0 {
fmt.Printf("No address found for %s\n", os.Args[1])
os.Exit(1)
}
for _, a := range addr {
m.Question[0] = dns.Question{"version.bind.", dns.TypeTXT, dns.ClassCHAOS}
in := c.Exchange(m, a)
if in != nil && in.Answer != nil {
fmt.Printf("%v\n", in.Answer[0])
}
m.Question[0] = dns.Question{"hostname.bind.", dns.TypeTXT, dns.ClassCHAOS}
in = c.Exchange(m, a)
if in != nil && in.Answer != nil {
fmt.Printf("%v\n", in.Answer[0])
}
}
}
func main() {
client := dns.NewClient()
fmt.Println("> dig liulonnie.net @74.220.195.131")
resp, err := client.Query(
dns.ParseIP("74.220.195.131"), // ns1.hostmonster.com
dns.Domain("liulonnie.net"),
dns.A,
)
if err != nil {
fmt.Println(err)
return
}
fmt.Println(resp.Msg)
fmt.Println("> dig -recursive google.com a")
client.RecurQuery(dns.Domain("google.com"), dns.A, os.Stdout)
fmt.Println("> dig -recursive liulonnie.net a")
client.RecurQuery(dns.Domain("liulonnie.net"), dns.A, os.Stdout)
fmt.Println("(do it again to see if caching works)")
fmt.Println("> dig -recursive liulonnie.net a")
client.RecurQuery(dns.Domain("liulonnie.net"), dns.A, os.Stdout)
}
func main() {
var serial *int = flag.Int("serial", 0, "Perform an IXFR with the given serial")
var nameserver *string = flag.String("ns", "127.0.0.1:53", "Query this nameserver")
// var secret *string = flag.String("secret", "", "Use this secret for TSIG")
flag.Parse()
zone := flag.Arg(flag.NArg() - 1)
client := dns.NewClient()
client.Net = "tcp"
m := new(dns.Msg)
if *serial > 0 {
m.SetIxfr(zone, uint32(*serial))
} else {
m.SetAxfr(zone)
}
if err := client.XfrReceive(m, *nameserver); err == nil {
for r := range client.ReplyChan {
if r.Error != nil {
if r.Error == dns.ErrXfrLast {
fmt.Printf("%v\n", r.Reply)
}
break
}
fmt.Printf("%v\n", r.Reply)
}
} else {
fmt.Printf("Error %v\n", err)
}
}
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 := dns.NewClient()
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() {
listen := flag.String("listen", "127.0.0.1:8053", "set the listener address")
server := flag.String("server", "127.0.0.1:53", "remote server address(es), seperate with commas")
verbose = flag.Bool("verbose", false, "Print packet as it flows through")
// cpuprofile := flag.String("cpuprofile", "", "write cpu profile to file")
flag.Usage = func() {
flag.PrintDefaults()
}
flag.Parse()
/*
if *cpuprofile != "" {
f, err := os.Create(*cpuprofile)
if err != nil {
log.Fatal(err)
}
pprof.StartCPUProfile(f)
defer pprof.StopCPUProfile()
}
*/
clients := strings.Split(*server, ",")
qr = make([]*FunkClient, len(clients))
for i, ra := range clients {
qr[i] = new(FunkClient)
qr[i].Client = dns.NewClient()
qr[i].Addr = ra
}
f = NewFunkenSturm()
ok := f.Setup()
if !ok {
println("Setup failed")
return
}
dns.HandleFunc(".", serve)
go listenAndServe(*listen, "tcp")
go listenAndServe(*listen, "udp")
forever:
for {
select {
case <-signal.Incoming:
println("Signal received, stopping")
break forever
}
}
}
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(os.Args[1], dns.TypeDNSKEY)
// Set EDNS0's Do bit
e := new(dns.RR_OPT)
e.Hdr.Name = "."
e.Hdr.Rrtype = dns.TypeOPT
e.SetUDPSize(2048)
e.SetDo()
m.Extra = append(m.Extra, e)
c := dns.NewClient()
r := c.Exchange(m, conf.Servers[0])
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)
}
// Stuff must be in the answer section, check len(r.Answer)
for _, k := range r.Answer {
// Foreach key would need to provide a DS records, both sha1 and sha256
if key, ok := k.(*dns.RR_DNSKEY); ok {
key.Hdr.Ttl = 0
ds := key.ToDS(dns.SHA1)
fmt.Printf("%v\n", ds)
ds = key.ToDS(dns.SHA256)
fmt.Printf("%v\n", ds)
ds = key.ToDS(dns.SHA384)
fmt.Printf("%v\n", ds)
}
}
}
// Get the key from the DNS (uses the local resolver) and return them.
// If nothing is found we return nil
func getKey(name string, keytag uint16, server string, tcp bool) *dns.RR_DNSKEY {
c := dns.NewClient()
if tcp {
c.Net = "tcp"
}
m := new(dns.Msg)
m.SetQuestion(name, dns.TypeDNSKEY)
r, err := c.Exchange(m, server)
if err != nil {
return nil
}
for _, k := range r.Answer {
if k1, ok := k.(*dns.RR_DNSKEY); ok {
if k1.KeyTag() == keytag {
return k1
}
}
}
return nil
}
func startParse(addr string) {
l := &lexer{
addr: addr,
client: dns.NewClient(),
fp: new(fingerprint),
items: make(chan item),
state: dnsAlive,
debug: true,
}
l.run()
// Not completely sure about this code..
for {
item := <-l.items
fmt.Printf("{%s %s}\n", itemString[item.typ], item.val)
if l.state == nil {
break
}
}
}
func main() {
var serial *int = flag.Int("serial", 0, "Perform an IXFR with the given serial")
var nameserver *string = flag.String("ns", "127.0.0.1:53", "Query this nameserver")
flag.Parse()
zone := flag.Arg(flag.NArg() - 1)
client := dns.NewClient()
client.Net = "tcp"
m := new(dns.Msg)
if *serial > 0 {
m.SetIxfr(zone, uint32(*serial))
} else {
m.SetAxfr(zone)
}
axfr, err := client.XfrReceive(m, *nameserver)
if err != nil {
println(err.String())
}
for _, v := range axfr {
fmt.Printf("%v\n", v)
}
}
func main() {
serial := flag.Int("serial", 0, "Perform an IXFR with the given serial")
nameserver := flag.String("ns", "127.0.0.1:53", "Query this nameserver")
tsig := flag.String("tsig", "", "request tsig with key: name:key (only hmac-md5)")
flag.Parse()
zone := flag.Arg(flag.NArg() - 1)
client := dns.NewClient()
client.Net = "tcp"
m := new(dns.Msg)
if *serial > 0 {
m.SetIxfr(zone, uint32(*serial))
} else {
m.SetAxfr(zone)
}
if *tsig != "" {
a := strings.SplitN(*tsig, ":", 2)
name, secret := a[0], a[1]
client.TsigSecret = map[string]string{name: secret}
m.SetTsig(name, dns.HmacMD5, 300, m.MsgHdr.Id, time.Now().Unix())
}
if err := client.XfrReceive(m, *nameserver); err == nil {
for r := range client.ReplyChan {
if r.Error != nil {
if r.Error == dns.ErrXfrLast {
fmt.Printf("%v\n", r.Reply)
}
break
}
fmt.Printf("%v\n", r.Reply)
}
} else {
fmt.Printf("Error %v\n", err)
}
}
func main() {
dnssec := flag.Bool("dnssec", false, "request DNSSEC records")
query := flag.Bool("question", false, "show question")
short := flag.Bool("short", false, "abbreviate long DNSSEC records")
check := flag.Bool("check", false, "check internal DNSSEC consistency")
anchor := flag.String("anchor", "", "use the DNSKEY in this file for checking consistency")
port := flag.Int("port", 53, "port number to use")
aa := flag.Bool("aa", false, "set AA flag in query")
ad := flag.Bool("ad", false, "set AD flag in query")
cd := flag.Bool("cd", false, "set CD flag in query")
rd := flag.Bool("rd", true, "unset RD flag in query")
tcp := flag.Bool("tcp", false, "TCP mode")
nsid := flag.Bool("nsid", false, "ask for NSID")
flag.Usage = func() {
fmt.Fprintf(os.Stderr, "Usage: %s [@server] [qtype] [qclass] [name ...]\n", os.Args[0])
flag.PrintDefaults()
}
conf, _ := dns.ClientConfigFromFile("/etc/resolv.conf")
nameserver := "@" + conf.Servers[0]
qtype := uint16(0)
qclass := uint16(dns.ClassINET) // Default qclass
var qname []string
flag.Parse()
if *anchor != "" {
f, err := os.Open(*anchor)
if err != nil {
fmt.Fprintf(os.Stderr, "Failure to open %s: %s\n", *anchor, err.Error())
}
r, err := dns.ReadRR(f, *anchor)
if err != nil {
fmt.Fprintf(os.Stderr, "Failure to read an RR from %s: %s\n", *anchor, err.Error())
}
if k, ok := r.(*dns.RR_DNSKEY); !ok {
fmt.Fprintf(os.Stderr, "No DNSKEY read from %s\n", *anchor)
} else {
dnskey = k
}
}
Flags:
for i := 0; i < flag.NArg(); i++ {
// If it starts with @ it is a nameserver
if flag.Arg(i)[0] == '@' {
nameserver = flag.Arg(i)
continue Flags
}
// First class, then type, to make ANY queries possible
// And if it looks like type, it is a type
if k, ok := dns.Str_rr[strings.ToUpper(flag.Arg(i))]; ok {
qtype = k
continue Flags
}
// If it looks like a class, it is a class
if k, ok := dns.Str_class[strings.ToUpper(flag.Arg(i))]; ok {
qclass = k
continue Flags
}
// If it starts with TYPExxx it is unknown rr
if strings.HasPrefix(flag.Arg(i), "TYPE") {
i, e := strconv.Atoi(string([]byte(flag.Arg(i))[4:]))
if e == nil {
qtype = uint16(i)
continue Flags
}
}
// Anything else is a qname
qname = append(qname, flag.Arg(i))
}
if len(qname) == 0 {
qname = make([]string, 1)
qname[0] = "."
qtype = dns.TypeNS
}
if qtype == 0 {
qtype = dns.TypeA
}
nameserver = string([]byte(nameserver)[1:]) // chop off @
nameserver += ":" + strconv.Itoa(*port)
// ipv6 todo
// We use the async query handling, just to show how
// it is to be used.
dns.HandleQueryFunc(".", q)
dns.ListenAndQuery(nil, nil)
c := dns.NewClient()
if *tcp {
c.Net = "tcp"
}
m := new(dns.Msg)
m.MsgHdr.Authoritative = *aa
m.MsgHdr.AuthenticatedData = *ad
m.MsgHdr.CheckingDisabled = *cd
m.MsgHdr.RecursionDesired = *rd
m.Question = make([]dns.Question, 1)
if *dnssec || *nsid {
o := new(dns.RR_OPT)
o.Hdr.Name = "."
o.Hdr.Rrtype = dns.TypeOPT
if *dnssec {
o.SetDo()
o.SetUDPSize(dns.DefaultMsgSize)
}
if *nsid {
o.SetNsid("")
}
m.Extra = append(m.Extra, o)
}
for _, v := range qname {
m.Question[0] = dns.Question{v, qtype, qclass}
m.Id = dns.Id()
if *query {
fmt.Printf("%s\n", m.String())
}
c.Do(m, nameserver)
}
i := 0
forever:
for {
select {
case r := <-dns.DefaultReplyChan:
if r.Reply != nil {
if r.Reply.Rcode == dns.RcodeSuccess {
if r.Request.Id != r.Reply.Id {
fmt.Printf("Id mismatch\n")
}
}
if *check {
sigCheck(r.Reply, nameserver, *tcp)
nsecCheck(r.Reply)
}
if *short {
r.Reply = shortMsg(r.Reply)
}
fmt.Printf("%v", r.Reply)
}
i++
if i == len(qname) {
break forever
}
}
}
}
func main() {
var dnssec *bool = flag.Bool("dnssec", false, "request DNSSEC records")
var query *bool = flag.Bool("question", false, "show question")
var short *bool = flag.Bool("short", false, "abbriate long DNSKEY and RRSIG RRs")
var aa *bool = flag.Bool("aa", false, "set AA flag in query")
var ad *bool = flag.Bool("ad", false, "set AD flag in query")
var cd *bool = flag.Bool("cd", false, "set CD flag in query")
var rd *bool = flag.Bool("rd", true, "unset RD flag in query")
var tcp *bool = flag.Bool("tcp", false, "TCP mode")
var nsid *bool = flag.Bool("nsid", false, "ask for NSID")
flag.Usage = func() {
fmt.Fprintf(os.Stderr, "Usage: %s [@server(:port)] [qtype] [qclass] [name ...]\n", os.Args[0])
flag.PrintDefaults()
}
// Need to think about it... Config
conf, _ := dns.ClientConfigFromFile("/etc/resolv.conf")
nameserver := "@" + conf.Servers[0]
qtype := uint16(0)
qclass := uint16(dns.ClassINET) // Default qclass
var qname []string
flag.Parse()
Flags:
for i := 0; i < flag.NArg(); i++ {
// If it starts with @ it is a nameserver
if flag.Arg(i)[0] == '@' {
nameserver = flag.Arg(i)
continue Flags
}
// First class, then type, to make ANY queries possible
// And if it looks like type, it is a type
for k, v := range dns.Rr_str {
if v == strings.ToUpper(flag.Arg(i)) {
qtype = k
continue Flags
}
}
// If it looks like a class, it is a class
for k, v := range dns.Class_str {
if v == strings.ToUpper(flag.Arg(i)) {
qclass = k
continue Flags
}
}
// If it starts with TYPExxx it is unknown rr
if strings.HasPrefix(flag.Arg(i), "TYPE") {
i, e := strconv.Atoi(string([]byte(flag.Arg(i))[4:]))
if e == nil {
qtype = uint16(i)
continue Flags
}
}
// Anything else is a qname
qname = append(qname, flag.Arg(i))
}
if len(qname) == 0 {
qname = make([]string, 1)
qname[0] = "."
qtype = dns.TypeNS
}
if qtype == 0 {
qtype = dns.TypeA
}
nameserver = string([]byte(nameserver)[1:]) // chop off @
if !strings.HasSuffix(nameserver, ":53") {
nameserver += ":53"
}
// ipv6 todo
// We use the async query handling, just to show how
// it is to be used.
dns.HandleQueryFunc(".", q)
dns.ListenAndQuery(nil, nil)
c := dns.NewClient()
if *tcp {
c.Net = "tcp"
}
m := new(dns.Msg)
m.MsgHdr.Authoritative = *aa
m.MsgHdr.AuthenticatedData = *ad
m.MsgHdr.CheckingDisabled = *cd
m.MsgHdr.RecursionDesired = *rd
m.Question = make([]dns.Question, 1)
if *dnssec || *nsid {
opt := dns.NewRR(dns.TypeOPT).(*dns.RR_OPT)
opt.Hdr.Rrtype = 0
opt.SetDo()
opt.SetVersion(0)
opt.SetUDPSize(dns.DefaultMsgSize)
if *nsid {
opt.SetNsid("")
}
m.Extra = make([]dns.RR, 1)
m.Extra[0] = opt
}
for _, v := range qname {
m.Question[0] = dns.Question{v, qtype, qclass}
m.Id = dns.Id()
if *query {
fmt.Printf("%s\n", m.String())
}
c.Do(m, nameserver)
}
i := 0
forever:
for {
select {
case r := <-dns.DefaultReplyChan:
if r[1] != nil {
if r[0].Id != r[1].Id {
fmt.Printf("Id mismatch\n")
}
if *short {
r[1] = shortMsg(r[1])
}
fmt.Printf("%v", r[1])
}
i++
if i == len(qname) {
break forever
}
}
}
}