forked from miekg/dns
/
types.go
843 lines (718 loc) · 17.3 KB
/
types.go
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// Copyright 2009 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// Extended and bugfixes by Miek Gieben
package dns
import (
"os"
"net"
"time"
"strconv"
"strings"
)
// Packet formats
// Wire constants and supported types.
const (
// valid RR_Header.Rrtype and Question.qtype
TypeA = 1
TypeNS = 2
TypeMD = 3
TypeMF = 4
TypeCNAME = 5
TypeSOA = 6
TypeMB = 7
TypeMG = 8
TypeMR = 9
TypeNULL = 10
TypeWKS = 11
TypePTR = 12
TypeHINFO = 13
TypeMINFO = 14
TypeMX = 15
TypeTXT = 16
TypeAAAA = 28
TypeLOC = 29
TypeSRV = 33
TypeNAPTR = 35
TypeKX = 36
TypeCERT = 37
TypeDNAME = 39
// EDNS
TypeOPT = 41
TypeSIG = 24
TypeKEY = 25
TypeNXT = 30
TypeDS = 43
TypeSSHFP = 44
TypeIPSECKEY = 45 // No type implemented
TypeRRSIG = 46
TypeNSEC = 47
TypeDNSKEY = 48
TypeDHCID = 49
TypeNSEC3 = 50
TypeNSEC3PARAM = 51
TypeTALINK = 58
TypeSPF = 99
TypeTKEY = 249
TypeTSIG = 250
// valid Question.Qtype only
TypeIXFR = 251
TypeAXFR = 252
TypeMAILB = 253
TypeMAILA = 254
TypeALL = 255
TypeURI = 256
TypeTA = 32768
TypeDLV = 32769
// valid Question.Qclass
ClassINET = 1
ClassCSNET = 2
ClassCHAOS = 3
ClassHESIOD = 4
ClassNONE = 254
ClassANY = 255
// Msg.rcode
RcodeSuccess = 0
RcodeFormatError = 1
RcodeServerFailure = 2
RcodeNameError = 3
RcodeNotImplemented = 4
RcodeRefused = 5
RcodeYXDomain = 6
RcodeYXRrset = 7
RcodeNXRrset = 8
RcodeNotAuth = 9
RcodeNotZone = 10
RcodeBadSig = 16 // TSIG
RcodeBadKey = 17
RcodeBadTime = 18
RcodeBadMode = 19 // TKEY
RcodeBadName = 20
RcodeBadAlg = 21
RcodeBadTrunc = 22 // TSIG
// Opcode
OpcodeQuery = 0
OpcodeIQuery = 1
OpcodeStatus = 2
// There is no 3
OpcodeNotify = 4
OpcodeUpdate = 5
)
// The wire format for the DNS packet header.
type Header struct {
Id uint16
Bits uint16
Qdcount, Ancount, Nscount, Arcount uint16
}
const (
// Header.Bits
_QR = 1 << 15 // query/response (response=1)
_AA = 1 << 10 // authoritative
_TC = 1 << 9 // truncated
_RD = 1 << 8 // recursion desired
_RA = 1 << 7 // recursion available
_Z = 1 << 6 // Z
_AD = 1 << 5 // authticated data
_CD = 1 << 4 // checking disabled
)
// DNS queries.
type Question struct {
Name string "domain-name" // "domain-name" specifies encoding
Qtype uint16
Qclass uint16
}
func (q *Question) String() string {
// prefix with ; (as in dig)
s := ";" + q.Name + "\t"
s = s + Class_str[q.Qclass] + "\t"
if _, ok := Rr_str[q.Qtype]; ok {
s += " " + Rr_str[q.Qtype]
} else {
s += " " + "TYPE" + strconv.Itoa(int(q.Qtype))
}
return s
}
// NewRRString returns the last RR contained in s.
func NewRRString(s string) (RR, os.Error) {
p := NewParser(strings.NewReader(s))
return p.RR()
}
// NewRR returns a new RR with the hdr.Rrtype also set.
// If the type i is not known, nil is returned.
func NewRR(i int) RR {
r := rr_mk[i]()
r.Header().Rrtype = uint16(i)
return r
}
type RR_CNAME struct {
Hdr RR_Header
Cname string "domain-name"
}
func (rr *RR_CNAME) Header() *RR_Header {
return &rr.Hdr
}
func (rr *RR_CNAME) String() string {
return rr.Hdr.String() + rr.Cname
}
type RR_HINFO struct {
Hdr RR_Header
Cpu string
Os string
}
func (rr *RR_HINFO) Header() *RR_Header {
return &rr.Hdr
}
func (rr *RR_HINFO) String() string {
return rr.Hdr.String() + rr.Cpu + " " + rr.Os
}
type RR_MB struct {
Hdr RR_Header
Mb string "domain-name"
}
func (rr *RR_MB) Header() *RR_Header {
return &rr.Hdr
}
func (rr *RR_MB) String() string {
return rr.Hdr.String() + rr.Mb
}
type RR_MG struct {
Hdr RR_Header
Mg string "domain-name"
}
func (rr *RR_MG) Header() *RR_Header {
return &rr.Hdr
}
func (rr *RR_MG) String() string {
return rr.Hdr.String() + rr.Mg
}
type RR_MINFO struct {
Hdr RR_Header
Rmail string "domain-name"
Email string "domain-name"
}
func (rr *RR_MINFO) Header() *RR_Header {
return &rr.Hdr
}
func (rr *RR_MINFO) String() string {
return rr.Hdr.String() + rr.Rmail + " " + rr.Email
}
type RR_MR struct {
Hdr RR_Header
Mr string "domain-name"
}
func (rr *RR_MR) Header() *RR_Header {
return &rr.Hdr
}
func (rr *RR_MR) String() string {
return rr.Hdr.String() + rr.Mr
}
type RR_MX struct {
Hdr RR_Header
Pref uint16
Mx string "domain-name"
}
func (rr *RR_MX) Header() *RR_Header {
return &rr.Hdr
}
func (rr *RR_MX) String() string {
return rr.Hdr.String() + strconv.Itoa(int(rr.Pref)) + " " + rr.Mx
}
type RR_NS struct {
Hdr RR_Header
Ns string "domain-name"
}
func (rr *RR_NS) Header() *RR_Header {
return &rr.Hdr
}
func (rr *RR_NS) String() string {
return rr.Hdr.String() + rr.Ns
}
type RR_PTR struct {
Hdr RR_Header
Ptr string "domain-name"
}
func (rr *RR_PTR) Header() *RR_Header {
return &rr.Hdr
}
func (rr *RR_PTR) String() string {
return rr.Hdr.String() + rr.Ptr
}
type RR_SOA struct {
Hdr RR_Header
Ns string "domain-name"
Mbox string "domain-name"
Serial uint32
Refresh uint32
Retry uint32
Expire uint32
Minttl uint32
}
func (rr *RR_SOA) Header() *RR_Header {
return &rr.Hdr
}
func (rr *RR_SOA) String() string {
return rr.Hdr.String() + rr.Ns + " " + rr.Mbox +
" " + strconv.Itoa(int(rr.Serial)) +
" " + strconv.Itoa(int(rr.Refresh)) +
" " + strconv.Itoa(int(rr.Retry)) +
" " + strconv.Itoa(int(rr.Expire)) +
" " + strconv.Itoa(int(rr.Minttl))
}
type RR_TXT struct {
Hdr RR_Header
Txt string "txt"
}
func (rr *RR_TXT) Header() *RR_Header {
return &rr.Hdr
}
func (rr *RR_TXT) String() string {
return rr.Hdr.String() + "\"" + rr.Txt + "\""
}
type RR_SRV struct {
Hdr RR_Header
Priority uint16
Weight uint16
Port uint16
Target string "domain-name"
}
func (rr *RR_SRV) Header() *RR_Header {
return &rr.Hdr
}
func (rr *RR_SRV) String() string {
return rr.Hdr.String() +
strconv.Itoa(int(rr.Priority)) + " " +
strconv.Itoa(int(rr.Weight)) + " " +
strconv.Itoa(int(rr.Port)) + " " + rr.Target
}
type RR_NAPTR struct {
Hdr RR_Header
Order uint16
Preference uint16
Flags string
Service string
Regexp string
Replacement string "domain-name"
}
func (rr *RR_NAPTR) Header() *RR_Header {
return &rr.Hdr
}
func (rr *RR_NAPTR) String() string {
return rr.Hdr.String() +
strconv.Itoa(int(rr.Order)) + " " +
strconv.Itoa(int(rr.Preference)) + " " +
"\"" + rr.Flags + "\" " +
"\"" + rr.Service + "\" " +
"\"" + rr.Regexp + "\" " +
rr.Replacement
}
// See RFC 4398.
type RR_CERT struct {
Hdr RR_Header
Type uint16
KeyTag uint16
Algorithm uint8
Certificate string "base64"
}
func (rr *RR_CERT) Header() *RR_Header {
return &rr.Hdr
}
func (rr *RR_CERT) String() string {
return rr.Hdr.String() + strconv.Itoa(int(rr.Type)) +
" " + strconv.Itoa(int(rr.KeyTag)) +
" " + strconv.Itoa(int(rr.Algorithm)) +
" " + rr.Certificate
}
// See RFC 2672.
type RR_DNAME struct {
Hdr RR_Header
Target string "domain-name"
}
func (rr *RR_DNAME) Header() *RR_Header {
return &rr.Hdr
}
func (rr *RR_DNAME) String() string {
return rr.Hdr.String() + rr.Target
}
type RR_A struct {
Hdr RR_Header
A net.IP "A"
}
func (rr *RR_A) Header() *RR_Header {
return &rr.Hdr
}
func (rr *RR_A) String() string {
return rr.Hdr.String() + rr.A.String()
}
type RR_AAAA struct {
Hdr RR_Header
AAAA net.IP "AAAA"
}
func (rr *RR_AAAA) Header() *RR_Header {
return &rr.Hdr
}
func (rr *RR_AAAA) String() string {
return rr.Hdr.String() + rr.AAAA.String()
}
type RR_LOC struct {
Hdr RR_Header
Version uint8
Size uint8
HorizPre uint8
VertPre uint8
Latitude uint32
Longitude uint32
Altitude uint32
}
func (rr *RR_LOC) Header() *RR_Header {
return &rr.Hdr
}
func (rr *RR_LOC) String() string {
// Version is not shown
return rr.Hdr.String() + "TODO"
}
type RR_RRSIG struct {
Hdr RR_Header
TypeCovered uint16
Algorithm uint8
Labels uint8
OrigTtl uint32
Expiration uint32
Inception uint32
KeyTag uint16
SignerName string "domain-name"
Signature string "base64"
}
func (rr *RR_RRSIG) Header() *RR_Header {
return &rr.Hdr
}
func (rr *RR_RRSIG) String() string {
return rr.Hdr.String() + Rr_str[rr.TypeCovered] +
" " + strconv.Itoa(int(rr.Algorithm)) +
" " + strconv.Itoa(int(rr.Labels)) +
" " + strconv.Itoa(int(rr.OrigTtl)) +
" " + timeToDate(rr.Expiration) +
" " + timeToDate(rr.Inception) +
" " + strconv.Itoa(int(rr.KeyTag)) +
" " + rr.SignerName +
" " + rr.Signature
}
type RR_NSEC struct {
Hdr RR_Header
NextDomain string "domain-name"
TypeBitMap []uint16 "NSEC"
}
func (rr *RR_NSEC) Header() *RR_Header {
return &rr.Hdr
}
func (rr *RR_NSEC) String() string {
s := rr.Hdr.String() + rr.NextDomain
for i := 0; i < len(rr.TypeBitMap); i++ {
if _, ok := Rr_str[rr.TypeBitMap[i]]; ok {
s += " " + Rr_str[rr.TypeBitMap[i]]
} else {
s += " " + "TYPE" + strconv.Itoa(int(rr.TypeBitMap[i]))
}
}
return s
}
type RR_DS struct {
Hdr RR_Header
KeyTag uint16
Algorithm uint8
DigestType uint8
Digest string "hex"
}
func (rr *RR_DS) Header() *RR_Header {
return &rr.Hdr
}
func (rr *RR_DS) String() string {
return rr.Hdr.String() + strconv.Itoa(int(rr.KeyTag)) +
" " + strconv.Itoa(int(rr.Algorithm)) +
" " + strconv.Itoa(int(rr.DigestType)) +
" " + strings.ToUpper(rr.Digest)
}
type RR_DLV struct {
Hdr RR_Header
KeyTag uint16
Algorithm uint8
DigestType uint8
Digest string "hex"
}
func (rr *RR_DLV) Header() *RR_Header {
return &rr.Hdr
}
func (rr *RR_DLV) String() string {
return rr.Hdr.String() + strconv.Itoa(int(rr.KeyTag)) +
" " + strconv.Itoa(int(rr.Algorithm)) +
" " + strconv.Itoa(int(rr.DigestType)) +
" " + strings.ToUpper(rr.Digest)
}
type RR_KX struct {
Hdr RR_Header
Preference uint16
Exchanger string "domain-name"
}
func (rr *RR_KX) Header() *RR_Header {
return &rr.Hdr
}
func (rr *RR_KX) String() string {
return rr.Hdr.String() + strconv.Itoa(int(rr.Preference)) +
" " + rr.Exchanger
}
type RR_TA struct {
Hdr RR_Header
KeyTag uint16
Algorithm uint8
DigestType uint8
Digest string "hex"
}
func (rr *RR_TA) Header() *RR_Header {
return &rr.Hdr
}
func (rr *RR_TA) String() string {
return rr.Hdr.String() + strconv.Itoa(int(rr.KeyTag)) +
" " + strconv.Itoa(int(rr.Algorithm)) +
" " + strconv.Itoa(int(rr.DigestType)) +
" " + strings.ToUpper(rr.Digest)
}
type RR_TALINK struct {
Hdr RR_Header
PreviousName string "domain"
NextName string "domain"
}
func (rr *RR_TALINK) Header() *RR_Header {
return &rr.Hdr
}
func (rr *RR_TALINK) String() string {
return rr.Hdr.String() +
" " + rr.PreviousName + " " + rr.NextName
}
type RR_SSHFP struct {
Hdr RR_Header
Algorithm uint8
Type uint8
FingerPrint string "hex"
}
func (rr *RR_SSHFP) Header() *RR_Header {
return &rr.Hdr
}
func (rr *RR_SSHFP) String() string {
return rr.Hdr.String() + strconv.Itoa(int(rr.Algorithm)) +
" " + strconv.Itoa(int(rr.Type)) +
" " + strings.ToUpper(rr.FingerPrint)
}
type RR_DNSKEY struct {
Hdr RR_Header
Flags uint16
Protocol uint8
Algorithm uint8
PublicKey string "base64"
}
func (rr *RR_DNSKEY) Header() *RR_Header {
return &rr.Hdr
}
func (rr *RR_DNSKEY) String() string {
return rr.Hdr.String() + strconv.Itoa(int(rr.Flags)) +
" " + strconv.Itoa(int(rr.Protocol)) +
" " + strconv.Itoa(int(rr.Algorithm)) +
" " + rr.PublicKey
}
type RR_NSEC3 struct {
Hdr RR_Header
Hash uint8
Flags uint8
Iterations uint16
SaltLength uint8
Salt string "size-hex"
HashLength uint8
NextDomain string "size-base32"
TypeBitMap []uint16 "NSEC"
}
func (rr *RR_NSEC3) Header() *RR_Header {
return &rr.Hdr
}
func (rr *RR_NSEC3) String() string {
s := rr.Hdr.String()
s += strconv.Itoa(int(rr.Hash)) +
" " + strconv.Itoa(int(rr.Flags)) +
" " + strconv.Itoa(int(rr.Iterations)) +
" " + strings.ToUpper(rr.Salt) +
" " + rr.NextDomain
for i := 0; i < len(rr.TypeBitMap); i++ {
if _, ok := Rr_str[rr.TypeBitMap[i]]; ok {
s += " " + Rr_str[rr.TypeBitMap[i]]
} else {
s += " " + "TYPE" + strconv.Itoa(int(rr.TypeBitMap[i]))
}
}
return s
}
type RR_NSEC3PARAM struct {
Hdr RR_Header
Hash uint8
Flags uint8
Iterations uint16
SaltLength uint8
Salt string "hex" // hexsize??
}
func (rr *RR_NSEC3PARAM) Header() *RR_Header {
return &rr.Hdr
}
func (rr *RR_NSEC3PARAM) String() string {
s := rr.Hdr.String()
s += strconv.Itoa(int(rr.Hash)) +
" " + strconv.Itoa(int(rr.Flags)) +
" " + strconv.Itoa(int(rr.Iterations)) +
" " + strings.ToUpper(rr.Salt)
return s
}
// See RFC 4408.
type RR_SPF struct {
Hdr RR_Header
Txt string
}
func (rr *RR_SPF) Header() *RR_Header {
return &rr.Hdr
}
func (rr *RR_SPF) String() string {
return rr.Hdr.String() + "\"" + rr.Txt + "\""
}
type RR_TKEY struct {
Hdr RR_Header
Algorithm string "domain-name"
Inception uint32
Expiration uint32
Mode uint16
Error uint16
KeySize uint16
Key string
Otherlen uint16
OtherData string
}
func (rr *RR_TKEY) Header() *RR_Header {
return &rr.Hdr
}
func (rr *RR_TKEY) String() string {
// It has no presentation format
return ""
}
// Unknown RR representation
type RR_RFC3597 struct {
Hdr RR_Header
Rdata string "hex"
}
func (rr *RR_RFC3597) Header() *RR_Header {
return &rr.Hdr
}
func (rr *RR_RFC3597) String() string {
s := rr.Hdr.String()
s += "\\# " + strconv.Itoa(len(rr.Rdata)/2) + " " + rr.Rdata
return s
}
type RR_URI struct {
Hdr RR_Header
Priority uint16
Weight uint16
Target string
}
func (rr *RR_URI) Header() *RR_Header {
return &rr.Hdr
}
func (rr *RR_URI) String() string {
return rr.Hdr.String() + strconv.Itoa(int(rr.Priority)) +
" " + strconv.Itoa(int(rr.Weight)) +
" " + rr.Target
}
type RR_DHCID struct {
Hdr RR_Header
Digest string "base64"
}
func (rr *RR_DHCID) Header() *RR_Header {
return &rr.Hdr
}
func (rr *RR_DHCID) String() string {
return rr.Hdr.String() + rr.Digest
}
// RFC 2845.
type RR_TSIG struct {
Hdr RR_Header
Algorithm string "domain-name"
TimeSigned uint64
Fudge uint16
MACSize uint16
MAC string "size-hex"
OrigId uint16
Error uint16
OtherLen uint16
OtherData string "size-hex"
}
func (rr *RR_TSIG) Header() *RR_Header {
return &rr.Hdr
}
// TSIG has no official presentation format, but this will suffice.
func (rr *RR_TSIG) String() string {
return rr.Hdr.String() +
" " + rr.Algorithm +
" " + tsigTimeToDate(rr.TimeSigned) +
" " + strconv.Itoa(int(rr.Fudge)) +
" " + strconv.Itoa(int(rr.MACSize)) +
" " + strings.ToUpper(rr.MAC) +
" " + strconv.Itoa(int(rr.OrigId)) +
" " + strconv.Itoa(int(rr.Error)) +
" " + strconv.Itoa(int(rr.OtherLen)) +
" " + rr.OtherData
}
// Translate the RRSIG's incep. and expir. time to the correct date.
// Taking into account serial arithmetic (RFC 1982)
func timeToDate(t uint32) string {
utc := time.UTC().Seconds()
mod := (int64(t) - utc) / Year68
// If needed assume wrap around(s)
ti := time.SecondsToUTC(int64(t) + (mod * Year68)) // abs()? TODO
return ti.Format("20060102150405")
}
// Translate the TSIG time signed into a date. There is no
// need for RFC1982 calculations as this date is 48 bits
func tsigTimeToDate(t uint64) string {
// only use the lower 48 bits, TODO(mg), check for 48 bit size
ti := time.SecondsToUTC(int64(t))
return ti.Format("20060102150405")
}
// Map of constructors for each RR wire type.
var rr_mk = map[int]func() RR{
TypeCNAME: func() RR { return new(RR_CNAME) },
TypeHINFO: func() RR { return new(RR_HINFO) },
TypeMB: func() RR { return new(RR_MB) },
TypeMG: func() RR { return new(RR_MG) },
TypeMINFO: func() RR { return new(RR_MINFO) },
TypeMR: func() RR { return new(RR_MR) },
TypeMX: func() RR { return new(RR_MX) },
TypeNS: func() RR { return new(RR_NS) },
TypePTR: func() RR { return new(RR_PTR) },
TypeSOA: func() RR { return new(RR_SOA) },
TypeTXT: func() RR { return new(RR_TXT) },
TypeSRV: func() RR { return new(RR_SRV) },
TypeNAPTR: func() RR { return new(RR_NAPTR) },
TypeDNAME: func() RR { return new(RR_DNAME) },
TypeA: func() RR { return new(RR_A) },
TypeAAAA: func() RR { return new(RR_AAAA) },
TypeLOC: func() RR { return new(RR_LOC) },
TypeOPT: func() RR { return new(RR_OPT) },
TypeDS: func() RR { return new(RR_DS) },
TypeCERT: func() RR { return new(RR_CERT) },
TypeKX: func() RR { return new(RR_KX) },
TypeSPF: func() RR { return new(RR_SPF) },
TypeTALINK: func() RR { return new(RR_TALINK) },
TypeSSHFP: func() RR { return new(RR_SSHFP) },
TypeRRSIG: func() RR { return new(RR_RRSIG) },
TypeNSEC: func() RR { return new(RR_NSEC) },
TypeDNSKEY: func() RR { return new(RR_DNSKEY) },
TypeNSEC3: func() RR { return new(RR_NSEC3) },
TypeDHCID: func() RR { return new(RR_DHCID) },
TypeNSEC3PARAM: func() RR { return new(RR_NSEC3PARAM) },
TypeTKEY: func() RR { return new(RR_TKEY) },
TypeTSIG: func() RR { return new(RR_TSIG) },
TypeURI: func() RR { return new(RR_URI) },
TypeTA: func() RR { return new(RR_TA) },
TypeDLV: func() RR { return new(RR_DLV) },
}