mirror of https://github.com/hashicorp/consul
289 lines
8.3 KiB
Go
289 lines
8.3 KiB
Go
package dns
|
|
|
|
import (
|
|
"errors"
|
|
"net"
|
|
"strconv"
|
|
)
|
|
|
|
const hexDigit = "0123456789abcdef"
|
|
|
|
// Everything is assumed in ClassINET.
|
|
|
|
// SetReply creates a reply message from a request message.
|
|
func (dns *Msg) SetReply(request *Msg) *Msg {
|
|
dns.Id = request.Id
|
|
dns.Response = true
|
|
dns.Opcode = request.Opcode
|
|
if dns.Opcode == OpcodeQuery {
|
|
dns.RecursionDesired = request.RecursionDesired // Copy rd bit
|
|
dns.CheckingDisabled = request.CheckingDisabled // Copy cd bit
|
|
}
|
|
dns.Rcode = RcodeSuccess
|
|
if len(request.Question) > 0 {
|
|
dns.Question = make([]Question, 1)
|
|
dns.Question[0] = request.Question[0]
|
|
}
|
|
return dns
|
|
}
|
|
|
|
// SetQuestion creates a question message, it sets the Question
|
|
// section, generates an Id and sets the RecursionDesired (RD)
|
|
// bit to true.
|
|
func (dns *Msg) SetQuestion(z string, t uint16) *Msg {
|
|
dns.Id = Id()
|
|
dns.RecursionDesired = true
|
|
dns.Question = make([]Question, 1)
|
|
dns.Question[0] = Question{z, t, ClassINET}
|
|
return dns
|
|
}
|
|
|
|
// SetNotify creates a notify message, it sets the Question
|
|
// section, generates an Id and sets the Authoritative (AA)
|
|
// bit to true.
|
|
func (dns *Msg) SetNotify(z string) *Msg {
|
|
dns.Opcode = OpcodeNotify
|
|
dns.Authoritative = true
|
|
dns.Id = Id()
|
|
dns.Question = make([]Question, 1)
|
|
dns.Question[0] = Question{z, TypeSOA, ClassINET}
|
|
return dns
|
|
}
|
|
|
|
// SetRcode creates an error message suitable for the request.
|
|
func (dns *Msg) SetRcode(request *Msg, rcode int) *Msg {
|
|
dns.SetReply(request)
|
|
dns.Rcode = rcode
|
|
return dns
|
|
}
|
|
|
|
// SetRcodeFormatError creates a message with FormError set.
|
|
func (dns *Msg) SetRcodeFormatError(request *Msg) *Msg {
|
|
dns.Rcode = RcodeFormatError
|
|
dns.Opcode = OpcodeQuery
|
|
dns.Response = true
|
|
dns.Authoritative = false
|
|
dns.Id = request.Id
|
|
return dns
|
|
}
|
|
|
|
// SetUpdate makes the message a dynamic update message. It
|
|
// sets the ZONE section to: z, TypeSOA, ClassINET.
|
|
func (dns *Msg) SetUpdate(z string) *Msg {
|
|
dns.Id = Id()
|
|
dns.Response = false
|
|
dns.Opcode = OpcodeUpdate
|
|
dns.Compress = false // BIND9 cannot handle compression
|
|
dns.Question = make([]Question, 1)
|
|
dns.Question[0] = Question{z, TypeSOA, ClassINET}
|
|
return dns
|
|
}
|
|
|
|
// SetIxfr creates message for requesting an IXFR.
|
|
func (dns *Msg) SetIxfr(z string, serial uint32, ns, mbox string) *Msg {
|
|
dns.Id = Id()
|
|
dns.Question = make([]Question, 1)
|
|
dns.Ns = make([]RR, 1)
|
|
s := new(SOA)
|
|
s.Hdr = RR_Header{z, TypeSOA, ClassINET, defaultTtl, 0}
|
|
s.Serial = serial
|
|
s.Ns = ns
|
|
s.Mbox = mbox
|
|
dns.Question[0] = Question{z, TypeIXFR, ClassINET}
|
|
dns.Ns[0] = s
|
|
return dns
|
|
}
|
|
|
|
// SetAxfr creates message for requesting an AXFR.
|
|
func (dns *Msg) SetAxfr(z string) *Msg {
|
|
dns.Id = Id()
|
|
dns.Question = make([]Question, 1)
|
|
dns.Question[0] = Question{z, TypeAXFR, ClassINET}
|
|
return dns
|
|
}
|
|
|
|
// SetTsig appends a TSIG RR to the message.
|
|
// This is only a skeleton TSIG RR that is added as the last RR in the
|
|
// additional section. The Tsig is calculated when the message is being send.
|
|
func (dns *Msg) SetTsig(z, algo string, fudge uint16, timesigned int64) *Msg {
|
|
t := new(TSIG)
|
|
t.Hdr = RR_Header{z, TypeTSIG, ClassANY, 0, 0}
|
|
t.Algorithm = algo
|
|
t.Fudge = fudge
|
|
t.TimeSigned = uint64(timesigned)
|
|
t.OrigId = dns.Id
|
|
dns.Extra = append(dns.Extra, t)
|
|
return dns
|
|
}
|
|
|
|
// SetEdns0 appends a EDNS0 OPT RR to the message.
|
|
// TSIG should always the last RR in a message.
|
|
func (dns *Msg) SetEdns0(udpsize uint16, do bool) *Msg {
|
|
e := new(OPT)
|
|
e.Hdr.Name = "."
|
|
e.Hdr.Rrtype = TypeOPT
|
|
e.SetUDPSize(udpsize)
|
|
if do {
|
|
e.SetDo()
|
|
}
|
|
dns.Extra = append(dns.Extra, e)
|
|
return dns
|
|
}
|
|
|
|
// IsTsig checks if the message has a TSIG record as the last record
|
|
// in the additional section. It returns the TSIG record found or nil.
|
|
func (dns *Msg) IsTsig() *TSIG {
|
|
if len(dns.Extra) > 0 {
|
|
if dns.Extra[len(dns.Extra)-1].Header().Rrtype == TypeTSIG {
|
|
return dns.Extra[len(dns.Extra)-1].(*TSIG)
|
|
}
|
|
}
|
|
return nil
|
|
}
|
|
|
|
// IsEdns0 checks if the message has a EDNS0 (OPT) record, any EDNS0
|
|
// record in the additional section will do. It returns the OPT record
|
|
// found or nil.
|
|
func (dns *Msg) IsEdns0() *OPT {
|
|
// EDNS0 is at the end of the additional section, start there.
|
|
// We might want to change this to *only* look at the last two
|
|
// records. So we see TSIG and/or OPT - this a slightly bigger
|
|
// change though.
|
|
for i := len(dns.Extra) - 1; i >= 0; i-- {
|
|
if dns.Extra[i].Header().Rrtype == TypeOPT {
|
|
return dns.Extra[i].(*OPT)
|
|
}
|
|
}
|
|
return nil
|
|
}
|
|
|
|
// IsDomainName checks if s is a valid domain name, it returns the number of
|
|
// labels and true, when a domain name is valid. Note that non fully qualified
|
|
// domain name is considered valid, in this case the last label is counted in
|
|
// the number of labels. When false is returned the number of labels is not
|
|
// defined. Also note that this function is extremely liberal; almost any
|
|
// string is a valid domain name as the DNS is 8 bit protocol. It checks if each
|
|
// label fits in 63 characters, but there is no length check for the entire
|
|
// string s. I.e. a domain name longer than 255 characters is considered valid.
|
|
func IsDomainName(s string) (labels int, ok bool) {
|
|
_, labels, err := packDomainName(s, nil, 0, nil, false)
|
|
return labels, err == nil
|
|
}
|
|
|
|
// IsSubDomain checks if child is indeed a child of the parent. If child and parent
|
|
// are the same domain true is returned as well.
|
|
func IsSubDomain(parent, child string) bool {
|
|
// Entire child is contained in parent
|
|
return CompareDomainName(parent, child) == CountLabel(parent)
|
|
}
|
|
|
|
// IsMsg sanity checks buf and returns an error if it isn't a valid DNS packet.
|
|
// The checking is performed on the binary payload.
|
|
func IsMsg(buf []byte) error {
|
|
// Header
|
|
if len(buf) < 12 {
|
|
return errors.New("dns: bad message header")
|
|
}
|
|
// Header: Opcode
|
|
// TODO(miek): more checks here, e.g. check all header bits.
|
|
return nil
|
|
}
|
|
|
|
// IsFqdn checks if a domain name is fully qualified.
|
|
func IsFqdn(s string) bool {
|
|
l := len(s)
|
|
if l == 0 {
|
|
return false
|
|
}
|
|
return s[l-1] == '.'
|
|
}
|
|
|
|
// IsRRset checks if a set of RRs is a valid RRset as defined by RFC 2181.
|
|
// This means the RRs need to have the same type, name, and class. Returns true
|
|
// if the RR set is valid, otherwise false.
|
|
func IsRRset(rrset []RR) bool {
|
|
if len(rrset) == 0 {
|
|
return false
|
|
}
|
|
if len(rrset) == 1 {
|
|
return true
|
|
}
|
|
rrHeader := rrset[0].Header()
|
|
rrType := rrHeader.Rrtype
|
|
rrClass := rrHeader.Class
|
|
rrName := rrHeader.Name
|
|
|
|
for _, rr := range rrset[1:] {
|
|
curRRHeader := rr.Header()
|
|
if curRRHeader.Rrtype != rrType || curRRHeader.Class != rrClass || curRRHeader.Name != rrName {
|
|
// Mismatch between the records, so this is not a valid rrset for
|
|
//signing/verifying
|
|
return false
|
|
}
|
|
}
|
|
|
|
return true
|
|
}
|
|
|
|
// Fqdn return the fully qualified domain name from s.
|
|
// If s is already fully qualified, it behaves as the identity function.
|
|
func Fqdn(s string) string {
|
|
if IsFqdn(s) {
|
|
return s
|
|
}
|
|
return s + "."
|
|
}
|
|
|
|
// Copied from the official Go code.
|
|
|
|
// ReverseAddr returns the in-addr.arpa. or ip6.arpa. hostname of the IP
|
|
// address suitable for reverse DNS (PTR) record lookups or an error if it fails
|
|
// to parse the IP address.
|
|
func ReverseAddr(addr string) (arpa string, err error) {
|
|
ip := net.ParseIP(addr)
|
|
if ip == nil {
|
|
return "", &Error{err: "unrecognized address: " + addr}
|
|
}
|
|
if ip.To4() != nil {
|
|
return strconv.Itoa(int(ip[15])) + "." + strconv.Itoa(int(ip[14])) + "." + strconv.Itoa(int(ip[13])) + "." +
|
|
strconv.Itoa(int(ip[12])) + ".in-addr.arpa.", nil
|
|
}
|
|
// Must be IPv6
|
|
buf := make([]byte, 0, len(ip)*4+len("ip6.arpa."))
|
|
// Add it, in reverse, to the buffer
|
|
for i := len(ip) - 1; i >= 0; i-- {
|
|
v := ip[i]
|
|
buf = append(buf, hexDigit[v&0xF])
|
|
buf = append(buf, '.')
|
|
buf = append(buf, hexDigit[v>>4])
|
|
buf = append(buf, '.')
|
|
}
|
|
// Append "ip6.arpa." and return (buf already has the final .)
|
|
buf = append(buf, "ip6.arpa."...)
|
|
return string(buf), nil
|
|
}
|
|
|
|
// String returns the string representation for the type t.
|
|
func (t Type) String() string {
|
|
if t1, ok := TypeToString[uint16(t)]; ok {
|
|
return t1
|
|
}
|
|
return "TYPE" + strconv.Itoa(int(t))
|
|
}
|
|
|
|
// String returns the string representation for the class c.
|
|
func (c Class) String() string {
|
|
if s, ok := ClassToString[uint16(c)]; ok {
|
|
// Only emit mnemonics when they are unambiguous, specically ANY is in both.
|
|
if _, ok := StringToType[s]; !ok {
|
|
return s
|
|
}
|
|
}
|
|
return "CLASS" + strconv.Itoa(int(c))
|
|
}
|
|
|
|
// String returns the string representation for the name n.
|
|
func (n Name) String() string {
|
|
return sprintName(string(n))
|
|
}
|