mirror of
https://github.com/miekg/dns.git
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c9b812d1d9
* Remove redundant parenthesis
These were caught with:
gofmt -r '(a) -> a' -w *.go
This commit only includes the changes where the formatting makes the
ordering of operations clear.
* Remove more redundant parenthesis
These were caught with:
gofmt -r '(a) -> a' -w *.go
This commit includes the remaining changes where the formatting does not
make the ordering of operations as clear as the previous commit.
1382 lines
32 KiB
Go
1382 lines
32 KiB
Go
package dns
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import (
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"fmt"
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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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type (
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// Type is a DNS type.
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Type uint16
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// Class is a DNS class.
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Class uint16
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// Name is a DNS domain name.
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Name string
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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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TypeNone uint16 = 0
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TypeA uint16 = 1
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TypeNS uint16 = 2
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TypeMD uint16 = 3
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TypeMF uint16 = 4
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TypeCNAME uint16 = 5
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TypeSOA uint16 = 6
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TypeMB uint16 = 7
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TypeMG uint16 = 8
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TypeMR uint16 = 9
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TypeNULL uint16 = 10
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TypePTR uint16 = 12
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TypeHINFO uint16 = 13
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TypeMINFO uint16 = 14
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TypeMX uint16 = 15
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TypeTXT uint16 = 16
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TypeRP uint16 = 17
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TypeAFSDB uint16 = 18
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TypeX25 uint16 = 19
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TypeISDN uint16 = 20
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TypeRT uint16 = 21
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TypeNSAPPTR uint16 = 23
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TypeSIG uint16 = 24
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TypeKEY uint16 = 25
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TypePX uint16 = 26
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TypeGPOS uint16 = 27
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TypeAAAA uint16 = 28
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TypeLOC uint16 = 29
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TypeNXT uint16 = 30
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TypeEID uint16 = 31
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TypeNIMLOC uint16 = 32
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TypeSRV uint16 = 33
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TypeATMA uint16 = 34
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TypeNAPTR uint16 = 35
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TypeKX uint16 = 36
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TypeCERT uint16 = 37
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TypeDNAME uint16 = 39
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TypeOPT uint16 = 41 // EDNS
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TypeDS uint16 = 43
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TypeSSHFP uint16 = 44
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TypeRRSIG uint16 = 46
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TypeNSEC uint16 = 47
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TypeDNSKEY uint16 = 48
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TypeDHCID uint16 = 49
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TypeNSEC3 uint16 = 50
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TypeNSEC3PARAM uint16 = 51
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TypeTLSA uint16 = 52
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TypeSMIMEA uint16 = 53
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TypeHIP uint16 = 55
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TypeNINFO uint16 = 56
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TypeRKEY uint16 = 57
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TypeTALINK uint16 = 58
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TypeCDS uint16 = 59
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TypeCDNSKEY uint16 = 60
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TypeOPENPGPKEY uint16 = 61
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TypeCSYNC uint16 = 62
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TypeSPF uint16 = 99
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TypeUINFO uint16 = 100
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TypeUID uint16 = 101
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TypeGID uint16 = 102
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TypeUNSPEC uint16 = 103
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TypeNID uint16 = 104
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TypeL32 uint16 = 105
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TypeL64 uint16 = 106
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TypeLP uint16 = 107
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TypeEUI48 uint16 = 108
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TypeEUI64 uint16 = 109
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TypeURI uint16 = 256
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TypeCAA uint16 = 257
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TypeAVC uint16 = 258
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TypeTKEY uint16 = 249
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TypeTSIG uint16 = 250
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// valid Question.Qtype only
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TypeIXFR uint16 = 251
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TypeAXFR uint16 = 252
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TypeMAILB uint16 = 253
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TypeMAILA uint16 = 254
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TypeANY uint16 = 255
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TypeTA uint16 = 32768
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TypeDLV uint16 = 32769
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TypeReserved uint16 = 65535
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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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ClassNONE = 254
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ClassANY = 255
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// Message Response Codes, see https://www.iana.org/assignments/dns-parameters/dns-parameters.xhtml
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RcodeSuccess = 0 // NoError - No Error [DNS]
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RcodeFormatError = 1 // FormErr - Format Error [DNS]
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RcodeServerFailure = 2 // ServFail - Server Failure [DNS]
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RcodeNameError = 3 // NXDomain - Non-Existent Domain [DNS]
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RcodeNotImplemented = 4 // NotImp - Not Implemented [DNS]
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RcodeRefused = 5 // Refused - Query Refused [DNS]
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RcodeYXDomain = 6 // YXDomain - Name Exists when it should not [DNS Update]
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RcodeYXRrset = 7 // YXRRSet - RR Set Exists when it should not [DNS Update]
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RcodeNXRrset = 8 // NXRRSet - RR Set that should exist does not [DNS Update]
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RcodeNotAuth = 9 // NotAuth - Server Not Authoritative for zone [DNS Update]
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RcodeNotZone = 10 // NotZone - Name not contained in zone [DNS Update/TSIG]
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RcodeBadSig = 16 // BADSIG - TSIG Signature Failure [TSIG]
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RcodeBadVers = 16 // BADVERS - Bad OPT Version [EDNS0]
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RcodeBadKey = 17 // BADKEY - Key not recognized [TSIG]
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RcodeBadTime = 18 // BADTIME - Signature out of time window [TSIG]
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RcodeBadMode = 19 // BADMODE - Bad TKEY Mode [TKEY]
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RcodeBadName = 20 // BADNAME - Duplicate key name [TKEY]
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RcodeBadAlg = 21 // BADALG - Algorithm not supported [TKEY]
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RcodeBadTrunc = 22 // BADTRUNC - Bad Truncation [TSIG]
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RcodeBadCookie = 23 // BADCOOKIE - Bad/missing Server Cookie [DNS Cookies]
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// Message Opcodes. There is no 3.
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OpcodeQuery = 0
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OpcodeIQuery = 1
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OpcodeStatus = 2
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OpcodeNotify = 4
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OpcodeUpdate = 5
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)
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// Header is 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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headerSize = 12
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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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// Various constants used in the LOC RR, See RFC 1887.
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const (
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LOC_EQUATOR = 1 << 31 // RFC 1876, Section 2.
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LOC_PRIMEMERIDIAN = 1 << 31 // RFC 1876, Section 2.
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LOC_HOURS = 60 * 1000
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LOC_DEGREES = 60 * LOC_HOURS
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LOC_ALTITUDEBASE = 100000
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)
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// Different Certificate Types, see RFC 4398, Section 2.1
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const (
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CertPKIX = 1 + iota
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CertSPKI
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CertPGP
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CertIPIX
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CertISPKI
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CertIPGP
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CertACPKIX
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CertIACPKIX
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CertURI = 253
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CertOID = 254
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)
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// CertTypeToString converts the Cert Type to its string representation.
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// See RFC 4398 and RFC 6944.
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var CertTypeToString = map[uint16]string{
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CertPKIX: "PKIX",
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CertSPKI: "SPKI",
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CertPGP: "PGP",
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CertIPIX: "IPIX",
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CertISPKI: "ISPKI",
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CertIPGP: "IPGP",
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CertACPKIX: "ACPKIX",
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CertIACPKIX: "IACPKIX",
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CertURI: "URI",
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CertOID: "OID",
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}
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// StringToCertType is the reverseof CertTypeToString.
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var StringToCertType = reverseInt16(CertTypeToString)
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//go:generate go run types_generate.go
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// Question holds a DNS question. There can be multiple questions in the
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// question section of a message. Usually there is just one.
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type Question struct {
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Name string `dns:"cdomain-name"` // "cdomain-name" specifies encoding (and may be compressed)
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Qtype uint16
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Qclass uint16
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}
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func (q *Question) len() int {
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return len(q.Name) + 1 + 2 + 2
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}
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func (q *Question) String() (s string) {
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// prefix with ; (as in dig)
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s = ";" + sprintName(q.Name) + "\t"
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s += Class(q.Qclass).String() + "\t"
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s += " " + Type(q.Qtype).String()
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return s
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}
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// ANY is a wildcard record. See RFC 1035, Section 3.2.3. ANY
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// is named "*" there.
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type ANY struct {
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Hdr RR_Header
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// Does not have any rdata
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}
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func (rr *ANY) String() string { return rr.Hdr.String() }
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// CNAME RR. See RFC 1034.
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type CNAME struct {
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Hdr RR_Header
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Target string `dns:"cdomain-name"`
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}
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func (rr *CNAME) String() string { return rr.Hdr.String() + sprintName(rr.Target) }
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// HINFO RR. See RFC 1034.
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type 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 *HINFO) String() string {
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return rr.Hdr.String() + sprintTxt([]string{rr.Cpu, rr.Os})
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}
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// MB RR. See RFC 1035.
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type MB struct {
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Hdr RR_Header
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Mb string `dns:"cdomain-name"`
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}
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func (rr *MB) String() string { return rr.Hdr.String() + sprintName(rr.Mb) }
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// MG RR. See RFC 1035.
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type MG struct {
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Hdr RR_Header
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Mg string `dns:"cdomain-name"`
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}
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func (rr *MG) String() string { return rr.Hdr.String() + sprintName(rr.Mg) }
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// MINFO RR. See RFC 1035.
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type MINFO struct {
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Hdr RR_Header
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Rmail string `dns:"cdomain-name"`
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Email string `dns:"cdomain-name"`
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}
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func (rr *MINFO) String() string {
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return rr.Hdr.String() + sprintName(rr.Rmail) + " " + sprintName(rr.Email)
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}
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// MR RR. See RFC 1035.
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type MR struct {
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Hdr RR_Header
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Mr string `dns:"cdomain-name"`
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}
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func (rr *MR) String() string {
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return rr.Hdr.String() + sprintName(rr.Mr)
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}
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// MF RR. See RFC 1035.
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type MF struct {
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Hdr RR_Header
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Mf string `dns:"cdomain-name"`
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}
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func (rr *MF) String() string {
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return rr.Hdr.String() + sprintName(rr.Mf)
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}
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// MD RR. See RFC 1035.
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type MD struct {
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Hdr RR_Header
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Md string `dns:"cdomain-name"`
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}
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func (rr *MD) String() string {
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return rr.Hdr.String() + sprintName(rr.Md)
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}
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// MX RR. See RFC 1035.
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type MX struct {
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Hdr RR_Header
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Preference uint16
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Mx string `dns:"cdomain-name"`
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}
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func (rr *MX) String() string {
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return rr.Hdr.String() + strconv.Itoa(int(rr.Preference)) + " " + sprintName(rr.Mx)
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}
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// AFSDB RR. See RFC 1183.
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type AFSDB struct {
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Hdr RR_Header
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Subtype uint16
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Hostname string `dns:"domain-name"`
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}
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func (rr *AFSDB) String() string {
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return rr.Hdr.String() + strconv.Itoa(int(rr.Subtype)) + " " + sprintName(rr.Hostname)
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}
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// X25 RR. See RFC 1183, Section 3.1.
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type X25 struct {
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Hdr RR_Header
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PSDNAddress string
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}
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func (rr *X25) String() string {
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return rr.Hdr.String() + rr.PSDNAddress
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}
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// RT RR. See RFC 1183, Section 3.3.
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type RT struct {
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Hdr RR_Header
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Preference uint16
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Host string `dns:"cdomain-name"`
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}
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func (rr *RT) String() string {
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return rr.Hdr.String() + strconv.Itoa(int(rr.Preference)) + " " + sprintName(rr.Host)
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}
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// NS RR. See RFC 1035.
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type NS struct {
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Hdr RR_Header
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Ns string `dns:"cdomain-name"`
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}
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func (rr *NS) String() string {
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return rr.Hdr.String() + sprintName(rr.Ns)
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}
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// PTR RR. See RFC 1035.
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type PTR struct {
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Hdr RR_Header
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Ptr string `dns:"cdomain-name"`
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}
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func (rr *PTR) String() string {
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return rr.Hdr.String() + sprintName(rr.Ptr)
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}
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// RP RR. See RFC 1138, Section 2.2.
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type RP struct {
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Hdr RR_Header
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Mbox string `dns:"domain-name"`
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Txt string `dns:"domain-name"`
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}
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func (rr *RP) String() string {
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return rr.Hdr.String() + rr.Mbox + " " + sprintTxt([]string{rr.Txt})
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}
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// SOA RR. See RFC 1035.
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type SOA struct {
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Hdr RR_Header
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Ns string `dns:"cdomain-name"`
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Mbox string `dns:"cdomain-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 *SOA) String() string {
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return rr.Hdr.String() + sprintName(rr.Ns) + " " + sprintName(rr.Mbox) +
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" " + strconv.FormatInt(int64(rr.Serial), 10) +
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" " + strconv.FormatInt(int64(rr.Refresh), 10) +
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" " + strconv.FormatInt(int64(rr.Retry), 10) +
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" " + strconv.FormatInt(int64(rr.Expire), 10) +
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" " + strconv.FormatInt(int64(rr.Minttl), 10)
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}
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// TXT RR. See RFC 1035.
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type TXT struct {
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Hdr RR_Header
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Txt []string `dns:"txt"`
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}
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func (rr *TXT) String() string { return rr.Hdr.String() + sprintTxt(rr.Txt) }
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func sprintName(s string) string {
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src := []byte(s)
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dst := make([]byte, 0, len(src))
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for i := 0; i < len(src); {
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if i+1 < len(src) && src[i] == '\\' && src[i+1] == '.' {
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dst = append(dst, src[i:i+2]...)
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i += 2
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} else {
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b, n := nextByte(src, i)
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if n == 0 {
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i++ // dangling back slash
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} else if b == '.' {
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dst = append(dst, b)
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} else {
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dst = appendDomainNameByte(dst, b)
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}
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i += n
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}
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}
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return string(dst)
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}
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func sprintTxtOctet(s string) string {
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src := []byte(s)
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dst := make([]byte, 0, len(src))
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dst = append(dst, '"')
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for i := 0; i < len(src); {
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if i+1 < len(src) && src[i] == '\\' && src[i+1] == '.' {
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dst = append(dst, src[i:i+2]...)
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i += 2
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} else {
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b, n := nextByte(src, i)
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if n == 0 {
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i++ // dangling back slash
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} else if b == '.' {
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dst = append(dst, b)
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} else {
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if b < ' ' || b > '~' {
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dst = appendByte(dst, b)
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} else {
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dst = append(dst, b)
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}
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}
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i += n
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}
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}
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dst = append(dst, '"')
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return string(dst)
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}
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func sprintTxt(txt []string) string {
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var out []byte
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for i, s := range txt {
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if i > 0 {
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out = append(out, ` "`...)
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} else {
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out = append(out, '"')
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}
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bs := []byte(s)
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for j := 0; j < len(bs); {
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b, n := nextByte(bs, j)
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if n == 0 {
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break
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}
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out = appendTXTStringByte(out, b)
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j += n
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}
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out = append(out, '"')
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}
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return string(out)
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}
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func appendDomainNameByte(s []byte, b byte) []byte {
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switch b {
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case '.', ' ', '\'', '@', ';', '(', ')': // additional chars to escape
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return append(s, '\\', b)
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}
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return appendTXTStringByte(s, b)
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}
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func appendTXTStringByte(s []byte, b byte) []byte {
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switch b {
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case '"', '\\':
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return append(s, '\\', b)
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}
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if b < ' ' || b > '~' {
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return appendByte(s, b)
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}
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return append(s, b)
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}
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func appendByte(s []byte, b byte) []byte {
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var buf [3]byte
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bufs := strconv.AppendInt(buf[:0], int64(b), 10)
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s = append(s, '\\')
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for i := 0; i < 3-len(bufs); i++ {
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s = append(s, '0')
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}
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for _, r := range bufs {
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s = append(s, r)
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}
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return s
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}
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func nextByte(b []byte, offset int) (byte, int) {
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if offset >= len(b) {
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return 0, 0
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}
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if b[offset] != '\\' {
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// not an escape sequence
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return b[offset], 1
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}
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switch len(b) - offset {
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|
case 1: // dangling escape
|
|
return 0, 0
|
|
case 2, 3: // too short to be \ddd
|
|
default: // maybe \ddd
|
|
if isDigit(b[offset+1]) && isDigit(b[offset+2]) && isDigit(b[offset+3]) {
|
|
return dddToByte(b[offset+1:]), 4
|
|
}
|
|
}
|
|
// not \ddd, just an RFC 1035 "quoted" character
|
|
return b[offset+1], 2
|
|
}
|
|
|
|
// SPF RR. See RFC 4408, Section 3.1.1.
|
|
type SPF struct {
|
|
Hdr RR_Header
|
|
Txt []string `dns:"txt"`
|
|
}
|
|
|
|
func (rr *SPF) String() string { return rr.Hdr.String() + sprintTxt(rr.Txt) }
|
|
|
|
// AVC RR. See https://www.iana.org/assignments/dns-parameters/AVC/avc-completed-template.
|
|
type AVC struct {
|
|
Hdr RR_Header
|
|
Txt []string `dns:"txt"`
|
|
}
|
|
|
|
func (rr *AVC) String() string { return rr.Hdr.String() + sprintTxt(rr.Txt) }
|
|
|
|
// SRV RR. See RFC 2782.
|
|
type SRV struct {
|
|
Hdr RR_Header
|
|
Priority uint16
|
|
Weight uint16
|
|
Port uint16
|
|
Target string `dns:"domain-name"`
|
|
}
|
|
|
|
func (rr *SRV) String() string {
|
|
return rr.Hdr.String() +
|
|
strconv.Itoa(int(rr.Priority)) + " " +
|
|
strconv.Itoa(int(rr.Weight)) + " " +
|
|
strconv.Itoa(int(rr.Port)) + " " + sprintName(rr.Target)
|
|
}
|
|
|
|
// NAPTR RR. See RFC 2915.
|
|
type NAPTR struct {
|
|
Hdr RR_Header
|
|
Order uint16
|
|
Preference uint16
|
|
Flags string
|
|
Service string
|
|
Regexp string
|
|
Replacement string `dns:"domain-name"`
|
|
}
|
|
|
|
func (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
|
|
}
|
|
|
|
// CERT RR. See RFC 4398.
|
|
type CERT struct {
|
|
Hdr RR_Header
|
|
Type uint16
|
|
KeyTag uint16
|
|
Algorithm uint8
|
|
Certificate string `dns:"base64"`
|
|
}
|
|
|
|
func (rr *CERT) String() string {
|
|
var (
|
|
ok bool
|
|
certtype, algorithm string
|
|
)
|
|
if certtype, ok = CertTypeToString[rr.Type]; !ok {
|
|
certtype = strconv.Itoa(int(rr.Type))
|
|
}
|
|
if algorithm, ok = AlgorithmToString[rr.Algorithm]; !ok {
|
|
algorithm = strconv.Itoa(int(rr.Algorithm))
|
|
}
|
|
return rr.Hdr.String() + certtype +
|
|
" " + strconv.Itoa(int(rr.KeyTag)) +
|
|
" " + algorithm +
|
|
" " + rr.Certificate
|
|
}
|
|
|
|
// DNAME RR. See RFC 2672.
|
|
type DNAME struct {
|
|
Hdr RR_Header
|
|
Target string `dns:"domain-name"`
|
|
}
|
|
|
|
func (rr *DNAME) String() string {
|
|
return rr.Hdr.String() + sprintName(rr.Target)
|
|
}
|
|
|
|
// A RR. See RFC 1035.
|
|
type A struct {
|
|
Hdr RR_Header
|
|
A net.IP `dns:"a"`
|
|
}
|
|
|
|
func (rr *A) String() string {
|
|
if rr.A == nil {
|
|
return rr.Hdr.String()
|
|
}
|
|
return rr.Hdr.String() + rr.A.String()
|
|
}
|
|
|
|
// AAAA RR. See RFC 3596.
|
|
type AAAA struct {
|
|
Hdr RR_Header
|
|
AAAA net.IP `dns:"aaaa"`
|
|
}
|
|
|
|
func (rr *AAAA) String() string {
|
|
if rr.AAAA == nil {
|
|
return rr.Hdr.String()
|
|
}
|
|
return rr.Hdr.String() + rr.AAAA.String()
|
|
}
|
|
|
|
// PX RR. See RFC 2163.
|
|
type PX struct {
|
|
Hdr RR_Header
|
|
Preference uint16
|
|
Map822 string `dns:"domain-name"`
|
|
Mapx400 string `dns:"domain-name"`
|
|
}
|
|
|
|
func (rr *PX) String() string {
|
|
return rr.Hdr.String() + strconv.Itoa(int(rr.Preference)) + " " + sprintName(rr.Map822) + " " + sprintName(rr.Mapx400)
|
|
}
|
|
|
|
// GPOS RR. See RFC 1712.
|
|
type GPOS struct {
|
|
Hdr RR_Header
|
|
Longitude string
|
|
Latitude string
|
|
Altitude string
|
|
}
|
|
|
|
func (rr *GPOS) String() string {
|
|
return rr.Hdr.String() + rr.Longitude + " " + rr.Latitude + " " + rr.Altitude
|
|
}
|
|
|
|
// LOC RR. See RFC RFC 1876.
|
|
type LOC struct {
|
|
Hdr RR_Header
|
|
Version uint8
|
|
Size uint8
|
|
HorizPre uint8
|
|
VertPre uint8
|
|
Latitude uint32
|
|
Longitude uint32
|
|
Altitude uint32
|
|
}
|
|
|
|
// cmToM takes a cm value expressed in RFC1876 SIZE mantissa/exponent
|
|
// format and returns a string in m (two decimals for the cm)
|
|
func cmToM(m, e uint8) string {
|
|
if e < 2 {
|
|
if e == 1 {
|
|
m *= 10
|
|
}
|
|
|
|
return fmt.Sprintf("0.%02d", m)
|
|
}
|
|
|
|
s := fmt.Sprintf("%d", m)
|
|
for e > 2 {
|
|
s += "0"
|
|
e--
|
|
}
|
|
return s
|
|
}
|
|
|
|
func (rr *LOC) String() string {
|
|
s := rr.Hdr.String()
|
|
|
|
lat := rr.Latitude
|
|
ns := "N"
|
|
if lat > LOC_EQUATOR {
|
|
lat = lat - LOC_EQUATOR
|
|
} else {
|
|
ns = "S"
|
|
lat = LOC_EQUATOR - lat
|
|
}
|
|
h := lat / LOC_DEGREES
|
|
lat = lat % LOC_DEGREES
|
|
m := lat / LOC_HOURS
|
|
lat = lat % LOC_HOURS
|
|
s += fmt.Sprintf("%02d %02d %0.3f %s ", h, m, float64(lat)/1000, ns)
|
|
|
|
lon := rr.Longitude
|
|
ew := "E"
|
|
if lon > LOC_PRIMEMERIDIAN {
|
|
lon = lon - LOC_PRIMEMERIDIAN
|
|
} else {
|
|
ew = "W"
|
|
lon = LOC_PRIMEMERIDIAN - lon
|
|
}
|
|
h = lon / LOC_DEGREES
|
|
lon = lon % LOC_DEGREES
|
|
m = lon / LOC_HOURS
|
|
lon = lon % LOC_HOURS
|
|
s += fmt.Sprintf("%02d %02d %0.3f %s ", h, m, float64(lon)/1000, ew)
|
|
|
|
var alt = float64(rr.Altitude) / 100
|
|
alt -= LOC_ALTITUDEBASE
|
|
if rr.Altitude%100 != 0 {
|
|
s += fmt.Sprintf("%.2fm ", alt)
|
|
} else {
|
|
s += fmt.Sprintf("%.0fm ", alt)
|
|
}
|
|
|
|
s += cmToM(rr.Size&0xf0>>4, rr.Size&0x0f) + "m "
|
|
s += cmToM(rr.HorizPre&0xf0>>4, rr.HorizPre&0x0f) + "m "
|
|
s += cmToM(rr.VertPre&0xf0>>4, rr.VertPre&0x0f) + "m"
|
|
|
|
return s
|
|
}
|
|
|
|
// SIG RR. See RFC 2535. The SIG RR is identical to RRSIG and nowadays only used for SIG(0), See RFC 2931.
|
|
type SIG struct {
|
|
RRSIG
|
|
}
|
|
|
|
// RRSIG RR. See RFC 4034 and RFC 3755.
|
|
type RRSIG struct {
|
|
Hdr RR_Header
|
|
TypeCovered uint16
|
|
Algorithm uint8
|
|
Labels uint8
|
|
OrigTtl uint32
|
|
Expiration uint32
|
|
Inception uint32
|
|
KeyTag uint16
|
|
SignerName string `dns:"domain-name"`
|
|
Signature string `dns:"base64"`
|
|
}
|
|
|
|
func (rr *RRSIG) String() string {
|
|
s := rr.Hdr.String()
|
|
s += Type(rr.TypeCovered).String()
|
|
s += " " + strconv.Itoa(int(rr.Algorithm)) +
|
|
" " + strconv.Itoa(int(rr.Labels)) +
|
|
" " + strconv.FormatInt(int64(rr.OrigTtl), 10) +
|
|
" " + TimeToString(rr.Expiration) +
|
|
" " + TimeToString(rr.Inception) +
|
|
" " + strconv.Itoa(int(rr.KeyTag)) +
|
|
" " + sprintName(rr.SignerName) +
|
|
" " + rr.Signature
|
|
return s
|
|
}
|
|
|
|
// NSEC RR. See RFC 4034 and RFC 3755.
|
|
type NSEC struct {
|
|
Hdr RR_Header
|
|
NextDomain string `dns:"domain-name"`
|
|
TypeBitMap []uint16 `dns:"nsec"`
|
|
}
|
|
|
|
func (rr *NSEC) String() string {
|
|
s := rr.Hdr.String() + sprintName(rr.NextDomain)
|
|
for i := 0; i < len(rr.TypeBitMap); i++ {
|
|
s += " " + Type(rr.TypeBitMap[i]).String()
|
|
}
|
|
return s
|
|
}
|
|
|
|
func (rr *NSEC) len() int {
|
|
l := rr.Hdr.len() + len(rr.NextDomain) + 1
|
|
lastwindow := uint32(2 ^ 32 + 1)
|
|
for _, t := range rr.TypeBitMap {
|
|
window := t / 256
|
|
if uint32(window) != lastwindow {
|
|
l += 1 + 32
|
|
}
|
|
lastwindow = uint32(window)
|
|
}
|
|
return l
|
|
}
|
|
|
|
// DLV RR. See RFC 4431.
|
|
type DLV struct{ DS }
|
|
|
|
// CDS RR. See RFC 7344.
|
|
type CDS struct{ DS }
|
|
|
|
// DS RR. See RFC 4034 and RFC 3658.
|
|
type DS struct {
|
|
Hdr RR_Header
|
|
KeyTag uint16
|
|
Algorithm uint8
|
|
DigestType uint8
|
|
Digest string `dns:"hex"`
|
|
}
|
|
|
|
func (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)
|
|
}
|
|
|
|
// KX RR. See RFC 2230.
|
|
type KX struct {
|
|
Hdr RR_Header
|
|
Preference uint16
|
|
Exchanger string `dns:"domain-name"`
|
|
}
|
|
|
|
func (rr *KX) String() string {
|
|
return rr.Hdr.String() + strconv.Itoa(int(rr.Preference)) +
|
|
" " + sprintName(rr.Exchanger)
|
|
}
|
|
|
|
// TA RR. See http://www.watson.org/~weiler/INI1999-19.pdf.
|
|
type TA struct {
|
|
Hdr RR_Header
|
|
KeyTag uint16
|
|
Algorithm uint8
|
|
DigestType uint8
|
|
Digest string `dns:"hex"`
|
|
}
|
|
|
|
func (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)
|
|
}
|
|
|
|
// TALINK RR. See https://www.iana.org/assignments/dns-parameters/TALINK/talink-completed-template.
|
|
type TALINK struct {
|
|
Hdr RR_Header
|
|
PreviousName string `dns:"domain-name"`
|
|
NextName string `dns:"domain-name"`
|
|
}
|
|
|
|
func (rr *TALINK) String() string {
|
|
return rr.Hdr.String() +
|
|
sprintName(rr.PreviousName) + " " + sprintName(rr.NextName)
|
|
}
|
|
|
|
// SSHFP RR. See RFC RFC 4255.
|
|
type SSHFP struct {
|
|
Hdr RR_Header
|
|
Algorithm uint8
|
|
Type uint8
|
|
FingerPrint string `dns:"hex"`
|
|
}
|
|
|
|
func (rr *SSHFP) String() string {
|
|
return rr.Hdr.String() + strconv.Itoa(int(rr.Algorithm)) +
|
|
" " + strconv.Itoa(int(rr.Type)) +
|
|
" " + strings.ToUpper(rr.FingerPrint)
|
|
}
|
|
|
|
// KEY RR. See RFC RFC 2535.
|
|
type KEY struct {
|
|
DNSKEY
|
|
}
|
|
|
|
// CDNSKEY RR. See RFC 7344.
|
|
type CDNSKEY struct {
|
|
DNSKEY
|
|
}
|
|
|
|
// DNSKEY RR. See RFC 4034 and RFC 3755.
|
|
type DNSKEY struct {
|
|
Hdr RR_Header
|
|
Flags uint16
|
|
Protocol uint8
|
|
Algorithm uint8
|
|
PublicKey string `dns:"base64"`
|
|
}
|
|
|
|
func (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
|
|
}
|
|
|
|
// RKEY RR. See https://www.iana.org/assignments/dns-parameters/RKEY/rkey-completed-template.
|
|
type RKEY struct {
|
|
Hdr RR_Header
|
|
Flags uint16
|
|
Protocol uint8
|
|
Algorithm uint8
|
|
PublicKey string `dns:"base64"`
|
|
}
|
|
|
|
func (rr *RKEY) String() string {
|
|
return rr.Hdr.String() + strconv.Itoa(int(rr.Flags)) +
|
|
" " + strconv.Itoa(int(rr.Protocol)) +
|
|
" " + strconv.Itoa(int(rr.Algorithm)) +
|
|
" " + rr.PublicKey
|
|
}
|
|
|
|
// NSAPPTR RR. See RFC 1348.
|
|
type NSAPPTR struct {
|
|
Hdr RR_Header
|
|
Ptr string `dns:"domain-name"`
|
|
}
|
|
|
|
func (rr *NSAPPTR) String() string { return rr.Hdr.String() + sprintName(rr.Ptr) }
|
|
|
|
// NSEC3 RR. See RFC 5155.
|
|
type NSEC3 struct {
|
|
Hdr RR_Header
|
|
Hash uint8
|
|
Flags uint8
|
|
Iterations uint16
|
|
SaltLength uint8
|
|
Salt string `dns:"size-hex:SaltLength"`
|
|
HashLength uint8
|
|
NextDomain string `dns:"size-base32:HashLength"`
|
|
TypeBitMap []uint16 `dns:"nsec"`
|
|
}
|
|
|
|
func (rr *NSEC3) String() string {
|
|
s := rr.Hdr.String()
|
|
s += strconv.Itoa(int(rr.Hash)) +
|
|
" " + strconv.Itoa(int(rr.Flags)) +
|
|
" " + strconv.Itoa(int(rr.Iterations)) +
|
|
" " + saltToString(rr.Salt) +
|
|
" " + rr.NextDomain
|
|
for i := 0; i < len(rr.TypeBitMap); i++ {
|
|
s += " " + Type(rr.TypeBitMap[i]).String()
|
|
}
|
|
return s
|
|
}
|
|
|
|
func (rr *NSEC3) len() int {
|
|
l := rr.Hdr.len() + 6 + len(rr.Salt)/2 + 1 + len(rr.NextDomain) + 1
|
|
lastwindow := uint32(2 ^ 32 + 1)
|
|
for _, t := range rr.TypeBitMap {
|
|
window := t / 256
|
|
if uint32(window) != lastwindow {
|
|
l += 1 + 32
|
|
}
|
|
lastwindow = uint32(window)
|
|
}
|
|
return l
|
|
}
|
|
|
|
// NSEC3PARAM RR. See RFC 5155.
|
|
type NSEC3PARAM struct {
|
|
Hdr RR_Header
|
|
Hash uint8
|
|
Flags uint8
|
|
Iterations uint16
|
|
SaltLength uint8
|
|
Salt string `dns:"size-hex:SaltLength"`
|
|
}
|
|
|
|
func (rr *NSEC3PARAM) String() string {
|
|
s := rr.Hdr.String()
|
|
s += strconv.Itoa(int(rr.Hash)) +
|
|
" " + strconv.Itoa(int(rr.Flags)) +
|
|
" " + strconv.Itoa(int(rr.Iterations)) +
|
|
" " + saltToString(rr.Salt)
|
|
return s
|
|
}
|
|
|
|
// TKEY RR. See RFC 2930.
|
|
type TKEY struct {
|
|
Hdr RR_Header
|
|
Algorithm string `dns:"domain-name"`
|
|
Inception uint32
|
|
Expiration uint32
|
|
Mode uint16
|
|
Error uint16
|
|
KeySize uint16
|
|
Key string `dns:"size-hex:KeySize"`
|
|
OtherLen uint16
|
|
OtherData string `dns:"size-hex:OtherLen"`
|
|
}
|
|
|
|
// TKEY has no official presentation format, but this will suffice.
|
|
func (rr *TKEY) String() string {
|
|
s := "\n;; TKEY PSEUDOSECTION:\n"
|
|
s += rr.Hdr.String() + " " + rr.Algorithm + " " +
|
|
strconv.Itoa(int(rr.KeySize)) + " " + rr.Key + " " +
|
|
strconv.Itoa(int(rr.OtherLen)) + " " + rr.OtherData
|
|
return s
|
|
}
|
|
|
|
// RFC3597 represents an unknown/generic RR. See RFC 3597.
|
|
type RFC3597 struct {
|
|
Hdr RR_Header
|
|
Rdata string `dns:"hex"`
|
|
}
|
|
|
|
func (rr *RFC3597) String() string {
|
|
// Let's call it a hack
|
|
s := rfc3597Header(rr.Hdr)
|
|
|
|
s += "\\# " + strconv.Itoa(len(rr.Rdata)/2) + " " + rr.Rdata
|
|
return s
|
|
}
|
|
|
|
func rfc3597Header(h RR_Header) string {
|
|
var s string
|
|
|
|
s += sprintName(h.Name) + "\t"
|
|
s += strconv.FormatInt(int64(h.Ttl), 10) + "\t"
|
|
s += "CLASS" + strconv.Itoa(int(h.Class)) + "\t"
|
|
s += "TYPE" + strconv.Itoa(int(h.Rrtype)) + "\t"
|
|
return s
|
|
}
|
|
|
|
// URI RR. See RFC 7553.
|
|
type URI struct {
|
|
Hdr RR_Header
|
|
Priority uint16
|
|
Weight uint16
|
|
Target string `dns:"octet"`
|
|
}
|
|
|
|
func (rr *URI) String() string {
|
|
return rr.Hdr.String() + strconv.Itoa(int(rr.Priority)) +
|
|
" " + strconv.Itoa(int(rr.Weight)) + " " + sprintTxtOctet(rr.Target)
|
|
}
|
|
|
|
// DHCID RR. See RFC 4701.
|
|
type DHCID struct {
|
|
Hdr RR_Header
|
|
Digest string `dns:"base64"`
|
|
}
|
|
|
|
func (rr *DHCID) String() string { return rr.Hdr.String() + rr.Digest }
|
|
|
|
// TLSA RR. See RFC 6698.
|
|
type TLSA struct {
|
|
Hdr RR_Header
|
|
Usage uint8
|
|
Selector uint8
|
|
MatchingType uint8
|
|
Certificate string `dns:"hex"`
|
|
}
|
|
|
|
func (rr *TLSA) String() string {
|
|
return rr.Hdr.String() +
|
|
strconv.Itoa(int(rr.Usage)) +
|
|
" " + strconv.Itoa(int(rr.Selector)) +
|
|
" " + strconv.Itoa(int(rr.MatchingType)) +
|
|
" " + rr.Certificate
|
|
}
|
|
|
|
// SMIMEA RR. See RFC 8162.
|
|
type SMIMEA struct {
|
|
Hdr RR_Header
|
|
Usage uint8
|
|
Selector uint8
|
|
MatchingType uint8
|
|
Certificate string `dns:"hex"`
|
|
}
|
|
|
|
func (rr *SMIMEA) String() string {
|
|
s := rr.Hdr.String() +
|
|
strconv.Itoa(int(rr.Usage)) +
|
|
" " + strconv.Itoa(int(rr.Selector)) +
|
|
" " + strconv.Itoa(int(rr.MatchingType))
|
|
|
|
// Every Nth char needs a space on this output. If we output
|
|
// this as one giant line, we can't read it can in because in some cases
|
|
// the cert length overflows scan.maxTok (2048).
|
|
sx := splitN(rr.Certificate, 1024) // conservative value here
|
|
s += " " + strings.Join(sx, " ")
|
|
return s
|
|
}
|
|
|
|
// HIP RR. See RFC 8005.
|
|
type HIP struct {
|
|
Hdr RR_Header
|
|
HitLength uint8
|
|
PublicKeyAlgorithm uint8
|
|
PublicKeyLength uint16
|
|
Hit string `dns:"size-hex:HitLength"`
|
|
PublicKey string `dns:"size-base64:PublicKeyLength"`
|
|
RendezvousServers []string `dns:"domain-name"`
|
|
}
|
|
|
|
func (rr *HIP) String() string {
|
|
s := rr.Hdr.String() +
|
|
strconv.Itoa(int(rr.PublicKeyAlgorithm)) +
|
|
" " + rr.Hit +
|
|
" " + rr.PublicKey
|
|
for _, d := range rr.RendezvousServers {
|
|
s += " " + sprintName(d)
|
|
}
|
|
return s
|
|
}
|
|
|
|
// NINFO RR. See https://www.iana.org/assignments/dns-parameters/NINFO/ninfo-completed-template.
|
|
type NINFO struct {
|
|
Hdr RR_Header
|
|
ZSData []string `dns:"txt"`
|
|
}
|
|
|
|
func (rr *NINFO) String() string { return rr.Hdr.String() + sprintTxt(rr.ZSData) }
|
|
|
|
// NID RR. See RFC RFC 6742.
|
|
type NID struct {
|
|
Hdr RR_Header
|
|
Preference uint16
|
|
NodeID uint64
|
|
}
|
|
|
|
func (rr *NID) String() string {
|
|
s := rr.Hdr.String() + strconv.Itoa(int(rr.Preference))
|
|
node := fmt.Sprintf("%0.16x", rr.NodeID)
|
|
s += " " + node[0:4] + ":" + node[4:8] + ":" + node[8:12] + ":" + node[12:16]
|
|
return s
|
|
}
|
|
|
|
// L32 RR, See RFC 6742.
|
|
type L32 struct {
|
|
Hdr RR_Header
|
|
Preference uint16
|
|
Locator32 net.IP `dns:"a"`
|
|
}
|
|
|
|
func (rr *L32) String() string {
|
|
if rr.Locator32 == nil {
|
|
return rr.Hdr.String() + strconv.Itoa(int(rr.Preference))
|
|
}
|
|
return rr.Hdr.String() + strconv.Itoa(int(rr.Preference)) +
|
|
" " + rr.Locator32.String()
|
|
}
|
|
|
|
// L64 RR, See RFC 6742.
|
|
type L64 struct {
|
|
Hdr RR_Header
|
|
Preference uint16
|
|
Locator64 uint64
|
|
}
|
|
|
|
func (rr *L64) String() string {
|
|
s := rr.Hdr.String() + strconv.Itoa(int(rr.Preference))
|
|
node := fmt.Sprintf("%0.16X", rr.Locator64)
|
|
s += " " + node[0:4] + ":" + node[4:8] + ":" + node[8:12] + ":" + node[12:16]
|
|
return s
|
|
}
|
|
|
|
// LP RR. See RFC 6742.
|
|
type LP struct {
|
|
Hdr RR_Header
|
|
Preference uint16
|
|
Fqdn string `dns:"domain-name"`
|
|
}
|
|
|
|
func (rr *LP) String() string {
|
|
return rr.Hdr.String() + strconv.Itoa(int(rr.Preference)) + " " + sprintName(rr.Fqdn)
|
|
}
|
|
|
|
// EUI48 RR. See RFC 7043.
|
|
type EUI48 struct {
|
|
Hdr RR_Header
|
|
Address uint64 `dns:"uint48"`
|
|
}
|
|
|
|
func (rr *EUI48) String() string { return rr.Hdr.String() + euiToString(rr.Address, 48) }
|
|
|
|
// EUI64 RR. See RFC 7043.
|
|
type EUI64 struct {
|
|
Hdr RR_Header
|
|
Address uint64
|
|
}
|
|
|
|
func (rr *EUI64) String() string { return rr.Hdr.String() + euiToString(rr.Address, 64) }
|
|
|
|
// CAA RR. See RFC 6844.
|
|
type CAA struct {
|
|
Hdr RR_Header
|
|
Flag uint8
|
|
Tag string
|
|
Value string `dns:"octet"`
|
|
}
|
|
|
|
func (rr *CAA) String() string {
|
|
return rr.Hdr.String() + strconv.Itoa(int(rr.Flag)) + " " + rr.Tag + " " + sprintTxtOctet(rr.Value)
|
|
}
|
|
|
|
// UID RR. Deprecated, IANA-Reserved.
|
|
type UID struct {
|
|
Hdr RR_Header
|
|
Uid uint32
|
|
}
|
|
|
|
func (rr *UID) String() string { return rr.Hdr.String() + strconv.FormatInt(int64(rr.Uid), 10) }
|
|
|
|
// GID RR. Deprecated, IANA-Reserved.
|
|
type GID struct {
|
|
Hdr RR_Header
|
|
Gid uint32
|
|
}
|
|
|
|
func (rr *GID) String() string { return rr.Hdr.String() + strconv.FormatInt(int64(rr.Gid), 10) }
|
|
|
|
// UINFO RR. Deprecated, IANA-Reserved.
|
|
type UINFO struct {
|
|
Hdr RR_Header
|
|
Uinfo string
|
|
}
|
|
|
|
func (rr *UINFO) String() string { return rr.Hdr.String() + sprintTxt([]string{rr.Uinfo}) }
|
|
|
|
// EID RR. See http://ana-3.lcs.mit.edu/~jnc/nimrod/dns.txt.
|
|
type EID struct {
|
|
Hdr RR_Header
|
|
Endpoint string `dns:"hex"`
|
|
}
|
|
|
|
func (rr *EID) String() string { return rr.Hdr.String() + strings.ToUpper(rr.Endpoint) }
|
|
|
|
// NIMLOC RR. See http://ana-3.lcs.mit.edu/~jnc/nimrod/dns.txt.
|
|
type NIMLOC struct {
|
|
Hdr RR_Header
|
|
Locator string `dns:"hex"`
|
|
}
|
|
|
|
func (rr *NIMLOC) String() string { return rr.Hdr.String() + strings.ToUpper(rr.Locator) }
|
|
|
|
// OPENPGPKEY RR. See RFC 7929.
|
|
type OPENPGPKEY struct {
|
|
Hdr RR_Header
|
|
PublicKey string `dns:"base64"`
|
|
}
|
|
|
|
func (rr *OPENPGPKEY) String() string { return rr.Hdr.String() + rr.PublicKey }
|
|
|
|
// CSYNC RR. See RFC 7477.
|
|
type CSYNC struct {
|
|
Hdr RR_Header
|
|
Serial uint32
|
|
Flags uint16
|
|
TypeBitMap []uint16 `dns:"nsec"`
|
|
}
|
|
|
|
func (rr *CSYNC) String() string {
|
|
s := rr.Hdr.String() + strconv.FormatInt(int64(rr.Serial), 10) + " " + strconv.Itoa(int(rr.Flags))
|
|
|
|
for i := 0; i < len(rr.TypeBitMap); i++ {
|
|
s += " " + Type(rr.TypeBitMap[i]).String()
|
|
}
|
|
return s
|
|
}
|
|
|
|
func (rr *CSYNC) len() int {
|
|
l := rr.Hdr.len() + 4 + 2
|
|
lastwindow := uint32(2 ^ 32 + 1)
|
|
for _, t := range rr.TypeBitMap {
|
|
window := t / 256
|
|
if uint32(window) != lastwindow {
|
|
l += 1 + 32
|
|
}
|
|
lastwindow = uint32(window)
|
|
}
|
|
return l
|
|
}
|
|
|
|
// TimeToString translates the RRSIG's incep. and expir. times to the
|
|
// string representation used when printing the record.
|
|
// It takes serial arithmetic (RFC 1982) into account.
|
|
func TimeToString(t uint32) string {
|
|
mod := (int64(t)-time.Now().Unix())/year68 - 1
|
|
if mod < 0 {
|
|
mod = 0
|
|
}
|
|
ti := time.Unix(int64(t)-mod*year68, 0).UTC()
|
|
return ti.Format("20060102150405")
|
|
}
|
|
|
|
// StringToTime translates the RRSIG's incep. and expir. times from
|
|
// string values like "20110403154150" to an 32 bit integer.
|
|
// It takes serial arithmetic (RFC 1982) into account.
|
|
func StringToTime(s string) (uint32, error) {
|
|
t, err := time.Parse("20060102150405", s)
|
|
if err != nil {
|
|
return 0, err
|
|
}
|
|
mod := t.Unix()/year68 - 1
|
|
if mod < 0 {
|
|
mod = 0
|
|
}
|
|
return uint32(t.Unix() - mod*year68), nil
|
|
}
|
|
|
|
// saltToString converts a NSECX salt to uppercase and returns "-" when it is empty.
|
|
func saltToString(s string) string {
|
|
if len(s) == 0 {
|
|
return "-"
|
|
}
|
|
return strings.ToUpper(s)
|
|
}
|
|
|
|
func euiToString(eui uint64, bits int) (hex string) {
|
|
switch bits {
|
|
case 64:
|
|
hex = fmt.Sprintf("%16.16x", eui)
|
|
hex = hex[0:2] + "-" + hex[2:4] + "-" + hex[4:6] + "-" + hex[6:8] +
|
|
"-" + hex[8:10] + "-" + hex[10:12] + "-" + hex[12:14] + "-" + hex[14:16]
|
|
case 48:
|
|
hex = fmt.Sprintf("%12.12x", eui)
|
|
hex = hex[0:2] + "-" + hex[2:4] + "-" + hex[4:6] + "-" + hex[6:8] +
|
|
"-" + hex[8:10] + "-" + hex[10:12]
|
|
}
|
|
return
|
|
}
|
|
|
|
// copyIP returns a copy of ip.
|
|
func copyIP(ip net.IP) net.IP {
|
|
p := make(net.IP, len(ip))
|
|
copy(p, ip)
|
|
return p
|
|
}
|
|
|
|
// SplitN splits a string into N sized string chunks.
|
|
// This might become an exported function once.
|
|
func splitN(s string, n int) []string {
|
|
if len(s) < n {
|
|
return []string{s}
|
|
}
|
|
sx := []string{}
|
|
p, i := 0, n
|
|
for {
|
|
if i <= len(s) {
|
|
sx = append(sx, s[p:i])
|
|
} else {
|
|
sx = append(sx, s[p:])
|
|
break
|
|
|
|
}
|
|
p, i = p+n, i+n
|
|
}
|
|
|
|
return sx
|
|
}
|