Net::DNS::Update(3pm)

1Net::DNS::Update(3)   User Contributed Perl Documentation  Net::DNS::Update(3)
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NAME

6       Net::DNS::Update - Create a DNS update packet
7

SYNOPSIS

9           use Net::DNS::Update;
10
11           $update = Net::DNS::Update->new;
12           $update = Net::DNS::Update->new('example.com', 'IN');
13
14           $update->push(prerequisite => nxrrset('foo.example.com. A'));
15           $update->push(update => rr_add('foo.example.com. 86400 A 192.168.1.2'));
16

DESCRIPTION

18       "Net::DNS::Update" is a subclass of "Net::DNS::Packet", to be used for
19       making DNS dynamic updates.  Programmers should refer to RFC 2136 for
20       the semantics of dynamic updates.
21

METHODS

23   new
24           $update = Net::DNS::Update->new;
25           $update = Net::DNS::Update->new('example.com');
26           $update = Net::DNS::Update->new('example.com', 'HS');
27
28       Returns a "Net::DNS::Update" object used to perform a DNS dynamic
29       update operation.  Specifically, it creates a packet with the header
30       opcode set to UPDATE and zone qtype to SOA (per RFC 2136, 2.3).
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32       Programs must use the "push" method to add RRs to the prerequisite,
33       update, and additional sections before performing the update.
34
35       Arguments are the zone name and the class.  If the zone is omitted, the
36       default domain will be taken from the resolver configuration.  If the
37       class is omitted, it defaults to IN.
38
39       Future versions of "Net::DNS" may provide a simpler interface for
40       making dynamic updates.
41

EXAMPLES

43       The first example below shows a complete program; subsequent examples
44       show only the creation of the update packet.
45
46   Add a new host
47           #!/usr/bin/perl -w
48
49           use strict;
50           use Net::DNS;
51
52           # Create the update packet.
53           my $update = Net::DNS::Update->new('example.com');
54
55           # Prerequisite is that no A records exist for the name.
56           $update->push(prerequisite => nxrrset('foo.example.com. A'));
57
58           # Add two A records for the name.
59           $update->push(update => rr_add('foo.example.com. 86400 A 192.168.1.2'));
60           $update->push(update => rr_add('foo.example.com. 86400 A 172.16.3.4'));
61
62           # Send the update to the zone's primary master.
63           my $res = Net::DNS::Resolver->new;
64           $res->nameservers('primary-master.example.com');
65
66           my $reply = $res->send($update);
67
68           # Did it work?
69           if ($reply) {
70               my $rcode = $reply->header->rcode;
71               print 'Update ', $rcode eq 'NOERROR' ? "succeeded\n" : "failed: $rcode\n";
72           } else {
73               print 'Update failed: ', $res->errorstring, "\n";
74           }
75
76   Add an MX record for a name that already exists
77           my $update = Net::DNS::Update->new('example.com');
78           $update->push(prerequisite => yxdomain('example.com'));
79           $update->push(update       => rr_add('example.com MX 10 mailhost.example.com'));
80
81   Add a TXT record for a name that doesn't exist
82           my $update = Net::DNS::Update->new('example.com');
83           $update->push(prerequisite => nxdomain('info.example.com'));
84           $update->push(update       => rr_add('info.example.com TXT "yabba dabba doo"'));
85
86   Delete all A records for a name
87           my $update = Net::DNS::Update->new('example.com');
88           $update->push(prerequisite => yxrrset('foo.example.com A'));
89           $update->push(update       => rr_del('foo.example.com A'));
90
91   Delete all RRs for a name
92           my $update = Net::DNS::Update->new('example.com');
93           $update->push(prerequisite => yxdomain('byebye.example.com'));
94           $update->push(update       => rr_del('byebye.example.com'));
95
96   Perform a signed update
97           my $key_name = 'tsig-key';
98           my $key_data = 'awwLOtRfpGE+rRKF2+DEiw==';
99
100           my $update = Net::DNS::Update->new('example.com');
101           $update->push(update => rr_add('foo.example.com A 10.1.2.3'));
102           $update->push(update => rr_add('bar.example.com A 10.4.5.6'));
103           $update->sign_tsig($key_name, $key_data);
104
105   Another way to perform a signed update
106           my $key_name = 'tsig-key';
107           my $key_data = 'awwLOtRfpGE+rRKF2+DEiw==';
108
109           my $update = Net::DNS::Update->new('example.com');
110           $update->push(update     => rr_add('foo.example.com A 10.1.2.3'));
111           $update->push(update     => rr_add('bar.example.com A 10.4.5.6'));
112           $update->push(additional => Net::DNS::RR->new("$key_name TSIG $key_data"));
113
114   Perform a signed update with a customized TSIG record
115           my $key_name = 'tsig-key';
116           my $key_data = 'awwLOtRfpGE+rRKF2+DEiw==';
117
118           my $tsig = Net::DNS::RR->new("$key_name TSIG $key_data");
119           $tsig->fudge(60);
120
121           my $update = Net::DNS::Update->new('example.com');
122           $update->push(update     => rr_add('foo.example.com A 10.1.2.3'));
123           $update->push(update     => rr_add('bar.example.com A 10.4.5.6'));
124           $update->push(additional => $tsig);
125

BUGS

127       WARNING:  This code is still under development.  Please use with
128       caution on production nameservers.
129

COPYRIGHT

131       Copyright (c)1997-2002 Michael Fuhr.
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133       Portions Copyright (c)2002-2004 Chris Reinhardt.
134
135       All rights reserved.
136
137       This program is free software; you may redistribute it and/or modify it
138       under the same terms as Perl itself.
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