Net::DNS::Update(3pm)

1Net::DNS::Update(3)   User Contributed Perl Documentation  Net::DNS::Update(3)
2
3
4

NAME

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

SYNOPSIS

9       "use Net::DNS::Update;"
10

DESCRIPTION

12       "Net::DNS::Update" is a subclass of "Net::DNS::Packet", to be used for
13       making DNS dynamic updates.  Programmers should refer to RFC 2136 for
14       the semantics of dynamic updates.
15
16       WARNING:  This code is still under development.  Please use with cau‐
17       tion on production nameservers.
18

METHODS

20       new
21
22           $packet = Net::DNS::Update->new;
23           $packet = Net::DNS::Update->new('example.com');
24           $packet = Net::DNS::Update->new('example.com', 'HS');
25
26       Returns a "Net::DNS::Update" object suitable for performing a DNS
27       dynamic update.  Specifically, it creates a packet with the header
28       opcode set to UPDATE and the zone record type to SOA (per RFC 2136,
29       Section 2.3).
30
31       Programs must use the "push" method to add RRs to the prerequisite,
32       update, and additional sections before performing the update.
33
34       Arguments are the zone name and the class.  If the zone is omitted, the
35       default domain will be taken from the resolver configuration.  If the
36       class is omitted, it defaults to IN.
37
38       Future versions of "Net::DNS" may provide a simpler interface for mak‐
39       ing dynamic updates.
40

EXAMPLES

42       The first example below shows a complete program; subsequent examples
43       show only the creation of the update packet.
44
45       Add a new host
46
47        #!/usr/bin/perl -w
48
49        use Net::DNS;
50        use strict;
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(pre => 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 ($reply) {
70            if ($reply->header->rcode eq 'NOERROR') {
71                print "Update succeeded\n";
72            } else {
73                print 'Update failed: ', $reply->header->rcode, "\n";
74            }
75        } else {
76            print 'Update failed: ', $res->errorstring, "\n";
77        }
78
79       Add an MX record for a name that already exists
80
81           my $update = Net::DNS::Update->new('example.com');
82           $update->push(pre    => yxdomain('example.com'));
83           $update->push(update => rr_add('example.com MX 10 mailhost.example.com'));
84
85       Add a TXT record for a name that doesn't exist
86
87           my $update = Net::DNS::Update->new('example.com');
88           $update->push(pre    => nxdomain('info.example.com'));
89           $update->push(update => rr_add('info.example.com TXT "yabba dabba doo"'));
90
91       Delete all A records for a name
92
93           my $update = Net::DNS::Update->new('example.com');
94           $update->push(pre    => yxrrset('foo.example.com A'));
95           $update->push(update => rr_del('foo.example.com A'));
96
97       Delete all RRs for a name
98
99           my $update = Net::DNS::Update->new('example.com');
100           $update->push(pre    => yxdomain('byebye.example.com'));
101           $update->push(update => rr_del('byebye.example.com'));
102
103       Perform a signed update
104
105           my $key_name = 'tsig-key';
106           my $key      = 'awwLOtRfpGE+rRKF2+DEiw==';
107
108           my $update = Net::DNS::Update->new('example.com');
109           $update->push(update => rr_add('foo.example.com A 10.1.2.3'));
110           $update->push(update => rr_add('bar.example.com A 10.4.5.6'));
111           $update->sign_tsig($key_name, $key);
112
113       Another way to perform a signed update
114
115           my $key_name = 'tsig-key';
116           my $key      = 'awwLOtRfpGE+rRKF2+DEiw==';
117
118           my $update = Net::DNS::Update->new('example.com');
119           $update->push(update     => rr_add('foo.example.com A 10.1.2.3'));
120           $update->push(update     => rr_add('bar.example.com A 10.4.5.6'));
121           $update->push(additional => Net::DNS::RR->new("$key_name TSIG $key"));
122
123       Perform a signed update with a customized TSIG record
124
125           my $key_name = 'tsig-key';
126           my $key      = 'awwLOtRfpGE+rRKF2+DEiw==';
127
128           my $tsig = Net::DNS::RR->new("$key_name TSIG $key");
129           $tsig->fudge(60);
130
131           my $update = Net::DNS::Update->new('example.com');
132           $update->push(update     => rr_add('foo.example.com A 10.1.2.3'));
133           $update->push(update     => rr_add('bar.example.com A 10.4.5.6'));
134           $update->push(additional => $tsig);
135

BUGS

137       This code is still under development.  Please use with caution on pro‐
138       duction nameservers.
139

COPYRIGHT

141       Copyright (c) 1997-2002 Michael Fuhr.
142
143       Portions Copyright (c) 2002-2004 Chris Reinhardt.
144
145       All rights reserved.  This program is free software; you may redis‐
146       tribute it and/or modify it under the same terms as Perl itself.
147