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package main
import (
"bytes"
"encoding/json"
"errors"
"fmt"
"github.com/miekg/dns"
"io/ioutil"
"net/http"
"strings"
"text/template"
"time"
)
type Zone struct {
Name string
View string
}
type TSIGSecrets struct {
secrets map[string]map[string]TSIGSecret
viewzones map[string][]string
}
func NewTSIGSecrets() *TSIGSecrets {
return &TSIGSecrets{
secrets: make(map[string]map[string]TSIGSecret),
viewzones: make(map[string][]string),
}
}
func (t *TSIGSecrets) GetViews() []string {
r := make([]string, 0, len(t.viewzones))
for k := range t.viewzones {
r = append(r, k)
}
return r
}
func (t *TSIGSecrets) GetViewZones() map[string][]string {
return t.viewzones
}
func (t *TSIGSecrets) UnmarshalJSON(d []byte) error {
v := make(map[string]map[string]string)
if err := json.Unmarshal(d, &v); err != nil {
return err
}
for k, v := range v {
o := strings.Split(k, "-")
view := o[len(o)-1]
d := make([]string, len(o))
copy(d, o[:len(o)-1])
dn := strings.Join(d, ".")
a, ok := v["algorithm"]
if !ok {
a = "hmac-sha256."
}
if !strings.HasSuffix(a, ".") {
a = fmt.Sprintf("%s.", a)
}
if _, ok := t.viewzones[view]; !ok {
t.viewzones[view] = make([]string, 1)
t.viewzones[view] = append(t.viewzones[view], dn)
} else {
t.viewzones[view] = append(t.viewzones[view], dn)
}
if _, ok := t.secrets[view]; !ok {
t.secrets[view] = make(map[string]TSIGSecret)
}
if !strings.HasSuffix(k, ".") {
k = fmt.Sprintf("%s.", k)
}
t.secrets[view][dn] = TSIGSecret{
KeyName: k,
Algorithm: a,
Secret: v["secret"],
}
}
return nil
}
func (t *TSIGSecrets) GetSecret(zone, view string) (*TSIGSecret, error) {
if !strings.HasSuffix(zone, ".") {
zone = fmt.Sprintf("%s.", zone)
}
if _, ok := t.secrets[view]; !ok {
return nil, errors.New("No keys for requested zone")
}
key, ok := t.secrets[view][zone]
if !ok {
return nil, errors.New("No keys for requested view of zone")
}
return &key, nil
}
type Signable interface {
SetTsig(string, string, uint16, int64) *dns.Msg
}
// TODO: Name and Algorithm end with dot (.)
type TSIGSecret struct {
KeyName string
Algorithm string `json:"algorithm"`
Secret string `json:"secret"`
}
func (t *TSIGSecret) Sign(r Signable) {
r.SetTsig(t.KeyName, t.Algorithm, 300, time.Now().Unix())
}
func (t *TSIGSecret) AsMap() map[string]string {
return map[string]string{
t.KeyName: t.Secret,
}
}
func getValue(v interface{}) string {
switch i := v.(type) {
case *dns.SOA:
return fmt.Sprintf("%s %s %d %d %d %d %d", i.Ns, i.Mbox, i.Serial, i.Refresh, i.Retry, i.Expire, i.Minttl)
case *dns.A:
return fmt.Sprintf("%s", i.A)
case *dns.CNAME:
return fmt.Sprintf("%s", i.Target)
case *dns.AAAA:
return fmt.Sprintf("%s", i.AAAA)
case *dns.MX:
return fmt.Sprintf("%d %s", i.Preference, i.Mx)
case *dns.TXT:
b := &bytes.Buffer{}
for _, t := range i.Txt {
fmt.Fprintf(b, "\"%s\"", t) // []
}
return b.String()
case *dns.PTR:
return fmt.Sprintf("%s", i.Ptr)
case *dns.NS:
return fmt.Sprintf("%s", i.Ns)
case *dns.SRV:
return fmt.Sprintf("%d %d %d %s", i.Priority, i.Weight, i.Port, i.Target)
case *dns.SPF:
b := &bytes.Buffer{}
for _, t := range i.Txt {
fmt.Fprintf(b, "\"%s\"", t) // []
}
return b.String()
default:
return "UNKNOWN"
}
}
func getDns(sm *TSIGSecrets) chan *dns.Envelope {
s, _ := sm.GetSecret("crute.us", "external")
c := &dns.Transfer{}
c.TsigSecret = s.AsMap()
m := &dns.Msg{}
m.SetAxfr("crute.us.")
s.Sign(m)
in, err := c.In(m, "172.16.18.52:53")
if err != nil {
fmt.Printf("Error: %s\n", err.Error())
return nil
}
return in
}
func dnsClass(rrh *dns.RR_Header) string {
return dns.Class(rrh.Class).String()
}
func dnsType(rrh *dns.RR_Header) string {
return dns.Type(rrh.Rrtype).String()
}
func dnsTTL(rrh *dns.RR_Header) string {
t := rrh.Ttl
if t/86400 > 1 {
return fmt.Sprintf("%d days", t/86400)
} else if t/3600 > 1 {
return fmt.Sprintf("%d hours", t/3600)
} else if t/60 > 1 {
return fmt.Sprintf("%d minutes", t/60)
} else {
return fmt.Sprintf("%d seconds", t)
}
}
func handler(w http.ResponseWriter, r *http.Request) {
fm := template.FuncMap{
"getValue": getValue,
"dnsClass": dnsClass,
"dnsType": dnsType,
"dnsTTL": dnsTTL,
}
t, _ := template.New("").Funcs(fm).ParseFiles("dns.html")
t.ExecuteTemplate(w, "dns.html", getDns(nil))
}
func main() {
/*
http.HandleFunc("/", handler)
http.ListenAndServe(":8080", nil)
*/
c, _ := ioutil.ReadFile("secrets.json")
k := NewTSIGSecrets()
json.Unmarshal(c, k)
//fmt.Printf("%+v\n", k)
for r := range getDns(k) {
for _, rr := range r.RR {
/* hlen := len(rr.Header().String())
fmt.Printf("%+v\n", rr.String()[hlen:]) */
}
}
}
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