92 lines
2.8 KiB
Go
92 lines
2.8 KiB
Go
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package dns
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import ()
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// Implements wrapper functions for dealing with dynamic update packets.
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// Dynamic update packets are identical to normal DNS messages, but the
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// names are redefined. See RFC 2136 for the details.
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type Update struct{ Msg }
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// Not sure if I want to keep these functions, but they
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// may help a programmer
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func (u *Update) Zone() []Question {
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return u.Msg.Question
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}
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func (u *Update) Prereq() []RR {
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return u.Msg.Answer
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}
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func (u *Update) Update() []RR {
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return u.Msg.Ns
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}
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func (u *Update) Additional() []RR {
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return u.Msg.Extra
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}
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// 3.2.4 - Table Of Metavalues Used In Prerequisite Section
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//
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// CLASS TYPE RDATA Meaning
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// ------------------------------------------------------------
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// ANY ANY empty Name is in use
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// ANY rrset empty RRset exists (value independent)
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// NONE ANY empty Name is not in use
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// NONE rrset empty RRset does not exist
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// zone rrset rr RRset exists (value dependent)
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// PrereqNameUsed sets the RRs in the prereq section to
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// "Name is in use" RRs. RFC 2136 section 2.4.4.
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func (u *Update) PrereqNameUsed(rr []RR) {
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u.Msg.Answer = make([]RR, len(rr))
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for i, r := range rr {
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u.Msg.Answer[i] = &RR_ANY{Hdr: RR_Header{Name: r.Header().Name, Ttl: 0, Rrtype: TypeANY, Class: ClassANY}}
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}
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}
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// PrereqNameNotUsed sets the RRs in the prereq section to
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// "Name is in not use" RRs. RFC 2136 section 2.4.5.
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func (u *Update) PrereqNameNotUsed(rr []RR) {
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u.Msg.Answer = make([]RR, len(rr))
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for i, r := range rr {
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u.Msg.Answer[i] = &RR_ANY{Hdr: RR_Header{Name: r.Header().Name, Ttl: 0, Rrtype: TypeANY, Class: ClassNONE}}
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}
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}
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// PrereqRRsetUsedFull sets the RRs in the prereq section to
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// "RRset exists (value dependent -- with rdata)" RRs. RFC 2136 section 2.4.2.
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func (u *Update) PrereqRRsetUsedFull(rr []RR) {
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u.Msg.Answer = make([]RR, len(rr))
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for i, r := range rr {
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u.Msg.Answer[i] = r
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u.Msg.Answer[i].Header().Class = u.Msg.Question[0].Qclass // TODO crashes if question is zero
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}
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}
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// PrereqRRsetUsed sets the RRs in the prereq section to
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// "RRset exists (value independent -- no rdata)" RRs. RFC 2136 section 2.4.1.
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func (u *Update) PrereqRRsetUsed(rr []RR) {
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u.Msg.Answer = make([]RR, len(rr))
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for i, r := range rr {
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u.Msg.Answer[i] = r
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u.Msg.Answer[i].Header().Class = ClassANY
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/* rdata should be cleared */
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}
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}
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// PrereqRRsetNotUsed sets the RRs in the prereq section to
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// "RRset does not exist" RRs. RFC 2136 section 2.4.3.
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func (u *Update) PrereqRRsetNotUsed(rr []RR) {
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u.Msg.Answer = make([]RR, len(rr))
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for i, r := range rr {
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u.Msg.Answer[i] = r
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u.Msg.Answer[i].Header().Class = ClassNONE
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/* rdata should be cleared */
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}
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}
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