1package dns
2
3// NameUsed sets the RRs in the prereq section to
4// "Name is in use" RRs. RFC 2136 section 2.4.4.
5func (u *Msg) NameUsed(rr []RR) {
6	if u.Answer == nil {
7		u.Answer = make([]RR, 0, len(rr))
8	}
9	for _, r := range rr {
10		u.Answer = append(u.Answer, &ANY{Hdr: RR_Header{Name: r.Header().Name, Ttl: 0, Rrtype: TypeANY, Class: ClassANY}})
11	}
12}
13
14// NameNotUsed sets the RRs in the prereq section to
15// "Name is in not use" RRs. RFC 2136 section 2.4.5.
16func (u *Msg) NameNotUsed(rr []RR) {
17	if u.Answer == nil {
18		u.Answer = make([]RR, 0, len(rr))
19	}
20	for _, r := range rr {
21		u.Answer = append(u.Answer, &ANY{Hdr: RR_Header{Name: r.Header().Name, Ttl: 0, Rrtype: TypeANY, Class: ClassNONE}})
22	}
23}
24
25// Used sets the RRs in the prereq section to
26// "RRset exists (value dependent -- with rdata)" RRs. RFC 2136 section 2.4.2.
27func (u *Msg) Used(rr []RR) {
28	if len(u.Question) == 0 {
29		panic("dns: empty question section")
30	}
31	if u.Answer == nil {
32		u.Answer = make([]RR, 0, len(rr))
33	}
34	for _, r := range rr {
35		r.Header().Class = u.Question[0].Qclass
36		u.Answer = append(u.Answer, r)
37	}
38}
39
40// RRsetUsed sets the RRs in the prereq section to
41// "RRset exists (value independent -- no rdata)" RRs. RFC 2136 section 2.4.1.
42func (u *Msg) RRsetUsed(rr []RR) {
43	if u.Answer == nil {
44		u.Answer = make([]RR, 0, len(rr))
45	}
46	for _, r := range rr {
47		u.Answer = append(u.Answer, &ANY{Hdr: RR_Header{Name: r.Header().Name, Ttl: 0, Rrtype: r.Header().Rrtype, Class: ClassANY}})
48	}
49}
50
51// RRsetNotUsed sets the RRs in the prereq section to
52// "RRset does not exist" RRs. RFC 2136 section 2.4.3.
53func (u *Msg) RRsetNotUsed(rr []RR) {
54	if u.Answer == nil {
55		u.Answer = make([]RR, 0, len(rr))
56	}
57	for _, r := range rr {
58		u.Answer = append(u.Answer, &ANY{Hdr: RR_Header{Name: r.Header().Name, Ttl: 0, Rrtype: r.Header().Rrtype, Class: ClassNONE}})
59	}
60}
61
62// Insert creates a dynamic update packet that adds an complete RRset, see RFC 2136 section 2.5.1.
63func (u *Msg) Insert(rr []RR) {
64	if len(u.Question) == 0 {
65		panic("dns: empty question section")
66	}
67	if u.Ns == nil {
68		u.Ns = make([]RR, 0, len(rr))
69	}
70	for _, r := range rr {
71		r.Header().Class = u.Question[0].Qclass
72		u.Ns = append(u.Ns, r)
73	}
74}
75
76// RemoveRRset creates a dynamic update packet that deletes an RRset, see RFC 2136 section 2.5.2.
77func (u *Msg) RemoveRRset(rr []RR) {
78	if u.Ns == nil {
79		u.Ns = make([]RR, 0, len(rr))
80	}
81	for _, r := range rr {
82		u.Ns = append(u.Ns, &ANY{Hdr: RR_Header{Name: r.Header().Name, Ttl: 0, Rrtype: r.Header().Rrtype, Class: ClassANY}})
83	}
84}
85
86// RemoveName creates a dynamic update packet that deletes all RRsets of a name, see RFC 2136 section 2.5.3
87func (u *Msg) RemoveName(rr []RR) {
88	if u.Ns == nil {
89		u.Ns = make([]RR, 0, len(rr))
90	}
91	for _, r := range rr {
92		u.Ns = append(u.Ns, &ANY{Hdr: RR_Header{Name: r.Header().Name, Ttl: 0, Rrtype: TypeANY, Class: ClassANY}})
93	}
94}
95
96// Remove creates a dynamic update packet deletes RR from a RRSset, see RFC 2136 section 2.5.4
97func (u *Msg) Remove(rr []RR) {
98	if u.Ns == nil {
99		u.Ns = make([]RR, 0, len(rr))
100	}
101	for _, r := range rr {
102		r.Header().Class = ClassNONE
103		r.Header().Ttl = 0
104		u.Ns = append(u.Ns, r)
105	}
106}
107