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a90533a13f
RFC3597 - unknown rr are implemented. Currently Go dns needs to now the type code, but must lack the actual implementation of that type. See IPSECKEY as an example.
743 lines
15 KiB
Go
743 lines
15 KiB
Go
// Copyright 2009 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// Extended and bugfixes by Miek Gieben
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// Resource Records are types in Go. They are not stored in wire format.
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// Basic usage pattern for creating new Resource Record:
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//
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// r := new(RR_TXT)
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// r.Hdr = RR_Header{Name: "a.miek.nl", Rrtype: TypeTXT, Class: ClassINET, Ttl: 3600}
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// r.TXT = "This is the content of the TXT record"
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//
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package dns
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import (
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"net"
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"strconv"
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"strings"
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"time"
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)
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// Packet formats
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// Wire constants and supported types.
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const (
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// valid RR_Header.Rrtype and Question.qtype
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TypeA = 1
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TypeNS = 2
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TypeMD = 3
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TypeMF = 4
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TypeCNAME = 5
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TypeSOA = 6
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TypeMB = 7
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TypeMG = 8
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TypeMR = 9
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TypeNULL = 10
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TypeWKS = 11
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TypePTR = 12
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TypeHINFO = 13
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TypeMINFO = 14
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TypeMX = 15
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TypeTXT = 16
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TypeAAAA = 28
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TypeLOC = 29
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TypeSRV = 33
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TypeNAPTR = 35
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TypeCERT = 37
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TypeDNAME = 39
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// EDNS
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TypeOPT = 41
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TypeSIG = 24
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TypeKEY = 25
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TypeNXT = 30
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TypeDS = 43
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TypeSSHFP = 44
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TypeIPSECKEY = 45 // No type implemented
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TypeRRSIG = 46
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TypeNSEC = 47
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TypeDNSKEY = 48
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TypeNSEC3 = 50
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TypeNSEC3PARAM = 51
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TypeTALINK = 58
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TypeSPF = 99
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TypeTKEY = 249
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TypeTSIG = 250
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// valid Question.qtype only
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TypeIXFR = 251
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TypeAXFR = 252
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TypeMAILB = 253
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TypeMAILA = 254
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TypeALL = 255
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TypeTA = 32768
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TypeDLV = 32769
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// valid Question.qclass
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ClassINET = 1
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ClassCSNET = 2
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ClassCHAOS = 3
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ClassHESIOD = 4
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ClassANY = 255
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// Msg.rcode
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RcodeSuccess = 0
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RcodeFormatError = 1
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RcodeServerFailure = 2
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RcodeNameError = 3
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RcodeNotImplemented = 4
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RcodeRefused = 5
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RcodeYXDomain = 6
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RcodeYXRrset = 7
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RcodeNXRrset = 8
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RcodeNotAuth = 9
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RcodeNotZone = 10
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RcodeBadSig = 16 // TSIG
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RcodeBadKey = 17
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RcodeBadTime = 18
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RcodeBadMode = 19 // TKEY
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RcodeBadName = 20
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RcodeBadAlg = 21
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RcodeBadTrunc = 22 // TSIG
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// Opcode
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OpcodeQuery = 0
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OpcodeIQuery = 1
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OpcodeStatus = 2
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// There is no 3
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OpcodeNotify = 4
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OpcodeUpdate = 5
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)
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// The wire format for the DNS packet header.
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type Header struct {
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Id uint16
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Bits uint16
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Qdcount, Ancount, Nscount, Arcount uint16
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}
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const (
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// Header.Bits
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_QR = 1 << 15 // query/response (response=1)
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_AA = 1 << 10 // authoritative
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_TC = 1 << 9 // truncated
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_RD = 1 << 8 // recursion desired
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_RA = 1 << 7 // recursion available
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_Z = 1 << 6 // Z
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_AD = 1 << 5 // authticated data
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_CD = 1 << 4 // checking disabled
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)
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// DNS queries.
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type Question struct {
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Name string "domain-name" // "domain-name" specifies encoding; see packers below
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Qtype uint16
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Qclass uint16
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}
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func (q *Question) String() string {
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// prefix with ; (as in dig)
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s := ";" + q.Name + "\t"
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s = s + Class_str[q.Qclass] + "\t"
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s = s + Rr_str[q.Qtype]
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return s
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}
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type RR_CNAME struct {
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Hdr RR_Header
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Cname string "domain-name"
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}
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func (rr *RR_CNAME) Header() *RR_Header {
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return &rr.Hdr
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}
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func (rr *RR_CNAME) String() string {
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return rr.Hdr.String() + rr.Cname
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}
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type RR_HINFO struct {
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Hdr RR_Header
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Cpu string
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Os string
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}
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func (rr *RR_HINFO) Header() *RR_Header {
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return &rr.Hdr
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}
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func (rr *RR_HINFO) String() string {
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return rr.Hdr.String() + rr.Cpu + " " + rr.Os
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}
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type RR_MB struct {
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Hdr RR_Header
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Mb string "domain-name"
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}
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func (rr *RR_MB) Header() *RR_Header {
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return &rr.Hdr
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}
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func (rr *RR_MB) String() string {
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return rr.Hdr.String() + rr.Mb
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}
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type RR_MG struct {
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Hdr RR_Header
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Mg string "domain-name"
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}
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func (rr *RR_MG) Header() *RR_Header {
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return &rr.Hdr
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}
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func (rr *RR_MG) String() string {
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return rr.Hdr.String() + rr.Mg
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}
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type RR_MINFO struct {
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Hdr RR_Header
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Rmail string "domain-name"
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Email string "domain-name"
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}
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func (rr *RR_MINFO) Header() *RR_Header {
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return &rr.Hdr
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}
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func (rr *RR_MINFO) String() string {
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return rr.Hdr.String() + rr.Rmail + " " + rr.Email
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}
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type RR_MR struct {
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Hdr RR_Header
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Mr string "domain-name"
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}
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func (rr *RR_MR) Header() *RR_Header {
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return &rr.Hdr
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}
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func (rr *RR_MR) String() string {
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return rr.Hdr.String() + rr.Mr
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}
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type RR_MX struct {
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Hdr RR_Header
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Pref uint16
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Mx string "domain-name"
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}
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func (rr *RR_MX) Header() *RR_Header {
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return &rr.Hdr
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}
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func (rr *RR_MX) String() string {
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return rr.Hdr.String() + strconv.Itoa(int(rr.Pref)) + " " + rr.Mx
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}
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type RR_NS struct {
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Hdr RR_Header
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Ns string "domain-name"
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}
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func (rr *RR_NS) Header() *RR_Header {
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return &rr.Hdr
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}
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func (rr *RR_NS) String() string {
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return rr.Hdr.String() + rr.Ns
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}
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type RR_PTR struct {
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Hdr RR_Header
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Ptr string "domain-name"
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}
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func (rr *RR_PTR) Header() *RR_Header {
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return &rr.Hdr
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}
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func (rr *RR_PTR) String() string {
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return rr.Hdr.String() + rr.Ptr
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}
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type RR_SOA struct {
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Hdr RR_Header
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Ns string "domain-name"
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Mbox string "domain-name"
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Serial uint32
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Refresh uint32
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Retry uint32
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Expire uint32
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Minttl uint32
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}
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func (rr *RR_SOA) Header() *RR_Header {
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return &rr.Hdr
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}
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func (rr *RR_SOA) String() string {
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return rr.Hdr.String() + rr.Ns + " " + rr.Mbox +
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" " + strconv.Itoa(int(rr.Serial)) +
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" " + strconv.Itoa(int(rr.Refresh)) +
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" " + strconv.Itoa(int(rr.Retry)) +
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" " + strconv.Itoa(int(rr.Expire)) +
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" " + strconv.Itoa(int(rr.Minttl))
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}
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type RR_TXT struct {
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Hdr RR_Header
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Txt string // not domain name
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}
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func (rr *RR_TXT) Header() *RR_Header {
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return &rr.Hdr
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}
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func (rr *RR_TXT) String() string {
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return rr.Hdr.String() + "\"" + rr.Txt + "\""
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}
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type RR_SRV struct {
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Hdr RR_Header
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Priority uint16
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Weight uint16
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Port uint16
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Target string "domain-name"
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}
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func (rr *RR_SRV) Header() *RR_Header {
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return &rr.Hdr
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}
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func (rr *RR_SRV) String() string {
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return rr.Hdr.String() +
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strconv.Itoa(int(rr.Priority)) + " " +
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strconv.Itoa(int(rr.Weight)) + " " +
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strconv.Itoa(int(rr.Port)) + " " + rr.Target
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}
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type RR_NAPTR struct {
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Hdr RR_Header
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Order uint16
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Preference uint16
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Flags string
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Service string
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Regexp string
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Replacement string "domain-name"
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}
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func (rr *RR_NAPTR) Header() *RR_Header {
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return &rr.Hdr
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}
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func (rr *RR_NAPTR) String() string {
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return rr.Hdr.String() +
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strconv.Itoa(int(rr.Order)) + " " +
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strconv.Itoa(int(rr.Preference)) + " " +
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"\"" + rr.Flags + "\" " +
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"\"" + rr.Service + "\" " +
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"\"" + rr.Regexp + "\" " +
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rr.Replacement
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}
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// RFC 4398
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type RR_CERT struct {
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Hdr RR_Header
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Type uint16
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KeyTag uint16
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Algorithm uint8
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Certificate string "base64"
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}
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func (rr *RR_CERT) Header() *RR_Header {
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return &rr.Hdr
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}
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func (rr *RR_CERT) String() string {
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return rr.Hdr.String() + strconv.Itoa(int(rr.Type)) +
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" " + strconv.Itoa(int(rr.KeyTag)) +
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" " + strconv.Itoa(int(rr.Algorithm)) +
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" " + rr.Certificate
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}
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// See RFC 2672.
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type RR_DNAME struct {
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Hdr RR_Header
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Target string "domain-name"
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}
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func (rr *RR_DNAME) Header() *RR_Header {
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return &rr.Hdr
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}
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func (rr *RR_DNAME) String() string {
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return rr.Hdr.String() + rr.Target
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}
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type RR_A struct {
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Hdr RR_Header
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A net.IP "A"
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}
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func (rr *RR_A) Header() *RR_Header {
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return &rr.Hdr
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}
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func (rr *RR_A) String() string {
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return rr.Hdr.String() + rr.A.String()
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}
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type RR_AAAA struct {
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Hdr RR_Header
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AAAA net.IP "AAAA"
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}
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func (rr *RR_AAAA) Header() *RR_Header {
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return &rr.Hdr
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}
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func (rr *RR_AAAA) String() string {
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return rr.Hdr.String() + rr.AAAA.String()
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}
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type RR_LOC struct {
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Hdr RR_Header
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Version uint8
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Size uint8
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HorizPre uint8
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VertPre uint8
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Latitude uint32
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Longitude uint32
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Altitude uint32
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}
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func (rr *RR_LOC) Header() *RR_Header {
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return &rr.Hdr
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}
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func (rr *RR_LOC) String() string {
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// Version is not shown
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return rr.Hdr.String() + "TODO"
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}
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// DNSSEC types
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type RR_RRSIG struct {
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Hdr RR_Header
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TypeCovered uint16
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Algorithm uint8
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Labels uint8
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OrigTtl uint32
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Expiration uint32
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Inception uint32
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KeyTag uint16
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SignerName string "domain-name"
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Signature string "base64"
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}
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func (rr *RR_RRSIG) Header() *RR_Header {
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return &rr.Hdr
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}
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func (rr *RR_RRSIG) String() string {
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return rr.Hdr.String() + Rr_str[rr.TypeCovered] +
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" " + strconv.Itoa(int(rr.Algorithm)) +
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" " + strconv.Itoa(int(rr.Labels)) +
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" " + strconv.Itoa(int(rr.OrigTtl)) +
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" " + timeToDate(rr.Expiration) +
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" " + timeToDate(rr.Inception) +
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" " + strconv.Itoa(int(rr.KeyTag)) +
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" " + rr.SignerName +
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" " + rr.Signature
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}
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type RR_NSEC struct {
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Hdr RR_Header
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NextDomain string "domain-name"
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TypeBitMap []uint16 "NSEC"
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}
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func (rr *RR_NSEC) Header() *RR_Header {
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return &rr.Hdr
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}
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func (rr *RR_NSEC) String() string {
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s := rr.Hdr.String() + rr.NextDomain
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for i := 0; i < len(rr.TypeBitMap); i++ {
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// Check if map exists, otherwise "TYPE" + strcov.Itoa(int(rr.TypeBitMap[i]))
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s = s + " " + Rr_str[rr.TypeBitMap[i]]
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}
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return s
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}
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type RR_DS struct {
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Hdr RR_Header
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KeyTag uint16
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Algorithm uint8
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DigestType uint8
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Digest string "hex"
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}
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func (rr *RR_DS) Header() *RR_Header {
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return &rr.Hdr
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}
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func (rr *RR_DS) String() string {
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return rr.Hdr.String() + strconv.Itoa(int(rr.KeyTag)) +
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" " + strconv.Itoa(int(rr.Algorithm)) +
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" " + strconv.Itoa(int(rr.DigestType)) +
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" " + strings.ToUpper(rr.Digest)
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}
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type RR_DLV struct {
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Hdr RR_Header
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KeyTag uint16
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Algorithm uint8
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DigestType uint8
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Digest string "hex"
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}
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func (rr *RR_DLV) Header() *RR_Header {
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return &rr.Hdr
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}
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func (rr *RR_DLV) String() string {
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return rr.Hdr.String() + strconv.Itoa(int(rr.KeyTag)) +
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" " + strconv.Itoa(int(rr.Algorithm)) +
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" " + strconv.Itoa(int(rr.DigestType)) +
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" " + strings.ToUpper(rr.Digest)
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}
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type RR_TA struct {
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Hdr RR_Header
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KeyTag uint16
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Algorithm uint8
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DigestType uint8
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Digest string "hex"
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}
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func (rr *RR_TA) Header() *RR_Header {
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return &rr.Hdr
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}
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func (rr *RR_TA) String() string {
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return rr.Hdr.String() + strconv.Itoa(int(rr.KeyTag)) +
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" " + strconv.Itoa(int(rr.Algorithm)) +
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" " + strconv.Itoa(int(rr.DigestType)) +
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" " + strings.ToUpper(rr.Digest)
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}
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type RR_TALINK struct {
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Hdr RR_Header
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PreviousName string "domain"
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NextName string "domain"
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}
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func (rr *RR_TALINK) Header() *RR_Header {
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return &rr.Hdr
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}
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func (rr *RR_TALINK) String() string {
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return rr.Hdr.String() +
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" " + rr.PreviousName + " " + rr.NextName
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}
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type RR_SSHFP struct {
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Hdr RR_Header
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Algorithm uint8
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Type uint8
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FingerPrint string "hex"
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}
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func (rr *RR_SSHFP) Header() *RR_Header {
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return &rr.Hdr
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}
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func (rr *RR_SSHFP) String() string {
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return rr.Hdr.String() + strconv.Itoa(int(rr.Algorithm)) +
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" " + strconv.Itoa(int(rr.Type)) +
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" " + strings.ToUpper(rr.FingerPrint)
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}
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type RR_DNSKEY struct {
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Hdr RR_Header
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Flags uint16
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Protocol uint8
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Algorithm uint8
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PublicKey string "base64"
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}
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func (rr *RR_DNSKEY) Header() *RR_Header {
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return &rr.Hdr
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}
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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 // must base32?
|
|
for i := 0; i < len(rr.TypeBitMap); i++ {
|
|
// Check if map exists, otherwise "TYPE" + strcov.Itoa(int(rr.TypeBitMap[i]))
|
|
s += " " + Rr_str[rr.TypeBitMap[i]]
|
|
}
|
|
return s
|
|
}
|
|
|
|
type RR_NSEC3PARAM struct {
|
|
Hdr RR_Header
|
|
Hash uint8
|
|
Flags uint8
|
|
Iterations uint16
|
|
SaltLength uint8
|
|
Salt string "hex"
|
|
}
|
|
|
|
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
|
|
}
|
|
|
|
// 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("20060102030405")
|
|
}
|
|
|
|
// 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("20060102030405")
|
|
}
|
|
|
|
// 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) },
|
|
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) },
|
|
TypeNSEC3PARAM: func() RR { return new(RR_NSEC3PARAM) },
|
|
TypeTKEY: func() RR { return new(RR_TKEY) },
|
|
TypeTSIG: func() RR { return new(RR_TSIG) },
|
|
TypeTA: func() RR { return new(RR_TA) },
|
|
TypeDLV: func() RR { return new(RR_DLV) },
|
|
}
|