update.go

Documentation: github.com/miekg/dns

     1  package dns
     2  
     3  // NameUsed sets the RRs in the prereq section to
     4  // "Name is in use" RRs. RFC 2136 section 2.4.4.
     5  func (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.
    16  func (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.
    27  func (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  		hdr := r.Header()
    36  		hdr.Class = u.Question[0].Qclass
    37  		hdr.Ttl = 0
    38  		u.Answer = append(u.Answer, r)
    39  	}
    40  }
    41  
    42  // RRsetUsed sets the RRs in the prereq section to
    43  // "RRset exists (value independent -- no rdata)" RRs. RFC 2136 section 2.4.1.
    44  func (u *Msg) RRsetUsed(rr []RR) {
    45  	if u.Answer == nil {
    46  		u.Answer = make([]RR, 0, len(rr))
    47  	}
    48  	for _, r := range rr {
    49  		h := r.Header()
    50  		u.Answer = append(u.Answer, &ANY{Hdr: RR_Header{Name: h.Name, Ttl: 0, Rrtype: h.Rrtype, Class: ClassANY}})
    51  	}
    52  }
    53  
    54  // RRsetNotUsed sets the RRs in the prereq section to
    55  // "RRset does not exist" RRs. RFC 2136 section 2.4.3.
    56  func (u *Msg) RRsetNotUsed(rr []RR) {
    57  	if u.Answer == nil {
    58  		u.Answer = make([]RR, 0, len(rr))
    59  	}
    60  	for _, r := range rr {
    61  		h := r.Header()
    62  		u.Answer = append(u.Answer, &ANY{Hdr: RR_Header{Name: h.Name, Ttl: 0, Rrtype: h.Rrtype, Class: ClassNONE}})
    63  	}
    64  }
    65  
    66  // Insert creates a dynamic update packet that adds an complete RRset, see RFC 2136 section 2.5.1.
    67  func (u *Msg) Insert(rr []RR) {
    68  	if len(u.Question) == 0 {
    69  		panic("dns: empty question section")
    70  	}
    71  	if u.Ns == nil {
    72  		u.Ns = make([]RR, 0, len(rr))
    73  	}
    74  	for _, r := range rr {
    75  		r.Header().Class = u.Question[0].Qclass
    76  		u.Ns = append(u.Ns, r)
    77  	}
    78  }
    79  
    80  // RemoveRRset creates a dynamic update packet that deletes an RRset, see RFC 2136 section 2.5.2.
    81  func (u *Msg) RemoveRRset(rr []RR) {
    82  	if u.Ns == nil {
    83  		u.Ns = make([]RR, 0, len(rr))
    84  	}
    85  	for _, r := range rr {
    86  		h := r.Header()
    87  		u.Ns = append(u.Ns, &ANY{Hdr: RR_Header{Name: h.Name, Ttl: 0, Rrtype: h.Rrtype, Class: ClassANY}})
    88  	}
    89  }
    90  
    91  // RemoveName creates a dynamic update packet that deletes all RRsets of a name, see RFC 2136 section 2.5.3
    92  func (u *Msg) RemoveName(rr []RR) {
    93  	if u.Ns == nil {
    94  		u.Ns = make([]RR, 0, len(rr))
    95  	}
    96  	for _, r := range rr {
    97  		u.Ns = append(u.Ns, &ANY{Hdr: RR_Header{Name: r.Header().Name, Ttl: 0, Rrtype: TypeANY, Class: ClassANY}})
    98  	}
    99  }
   100  
   101  // Remove creates a dynamic update packet deletes RR from a RRSset, see RFC 2136 section 2.5.4
   102  func (u *Msg) Remove(rr []RR) {
   103  	if u.Ns == nil {
   104  		u.Ns = make([]RR, 0, len(rr))
   105  	}
   106  	for _, r := range rr {
   107  		h := r.Header()
   108  		h.Class = ClassNONE
   109  		h.Ttl = 0
   110  		u.Ns = append(u.Ns, r)
   111  	}
   112  }
   113
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