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# Net::DNS::Resolver::Programmable |
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# A Net::DNS::Resolver descendant class for offline emulation of DNS |
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# |
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# (C) 2006-2007 Julian Mehnle |
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# Maintained from 2017 by David Precious (BIGPRESH) |
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# |
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############################################################################## |
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package Net::DNS::Resolver::Programmable; |
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=head1 NAME |
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Net::DNS::Resolver::Programmable - programmable DNS resolver class for offline |
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emulation of DNS |
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=cut |
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our $VERSION; |
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$VERSION = '0.008'; |
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use warnings; |
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use strict; |
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use Net::DNS; |
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use base 'Net::DNS::Resolver'; |
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use constant TRUE => (0 == 0); |
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use constant FALSE => not TRUE; |
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my %rcode = map { $_ => 1 } qw(NOERROR FORMERR SERVFAIL NXDOMAIN NOTIMP |
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REFUSED YXDOMAIN YXRRSET NXRRSET NOTAUTH NOTZONE BADVERS |
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BADSIG BADKEY BADTIME BADMODE BADNAME BADALG BADTRUNC); |
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# Interface: |
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############################################################################## |
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=head1 SYNOPSIS |
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use Net::DNS::Resolver::Programmable; |
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use Net::DNS::RR; |
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my $resolver = Net::DNS::Resolver::Programmable->new( |
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records => { |
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'example.com' => [ |
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Net::DNS::RR->new('example.com. NS ns.example.org.'), |
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Net::DNS::RR->new('example.com. A 192.168.0.1') |
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], |
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'ns.example.org' => [ |
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Net::DNS::RR->new('ns.example.org. A 192.168.1.1') |
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] |
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}, |
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resolver_code => sub { |
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my ($domain, $rr_type, $class) = @_; |
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... |
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return ($result, $aa, @rrs); |
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} |
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); |
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=cut |
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# Implementation: |
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############################################################################## |
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=head1 DESCRIPTION |
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B is a B descendant |
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class that allows a virtual DNS to be emulated instead of querying the real |
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DNS. A set of static DNS records may be supplied, or arbitrary code may be |
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specified as a means for retrieving DNS records, or even generating them on the |
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fly. |
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=head2 Constructor |
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The following constructor is provided: |
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=over |
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=item B: returns I |
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Creates a new programmed DNS resolver object. |
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%options is a list of key/value pairs representing any of the following |
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options: |
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=over |
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=item B |
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A reference to a hash of arrays containing a static set of I |
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objects. The hash entries must be indexed by fully qualified domain names |
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(lower-case, without any trailing dots), and the entries themselves must be |
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arrays of the RR objects pertaining to these domain names. For example: |
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records => { |
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'example.com' => [ |
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Net::DNS::RR->new('example.com. NS ns.example.org.'), |
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Net::DNS::RR->new('example.com. A 192.168.0.1') |
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], |
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'www.example.com' => [ |
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Net::DNS::RR->new('www.example.com. A 192.168.0.2') |
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], |
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'ns.example.org' => [ |
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Net::DNS::RR->new('ns.example.org. A 192.168.1.1') |
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] |
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} |
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If this option is specified, the resolver retrieves requested RRs from this |
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data structure. |
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=item B |
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A code reference used as a call-back for dynamically retrieving requested RRs. |
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The code must take the following query parameters as arguments: the I, |
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I, and I. |
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It must return a list composed of: the response's I (by name, as |
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returned by L<< Net::DNS::Header->rcode|Net::DNS::Header/rcode >>), the |
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I<< C (authoritative answer) flag >> (I, use B if you don't |
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care), and the I. If an error string is returned |
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instead of a valid RCODE, a I object is not constructed but |
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an error condition for the resolver is signaled instead. |
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For example: |
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resolver_code => sub { |
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my ($domain, $rr_type, $class) = @_; |
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... |
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return ($result, $aa, @rrs); |
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} |
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If both this and the C option are specified, then statically |
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programmed records are used in addition to any that are returned by the |
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configured resolver code. |
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=item B |
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=item B |
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=item B |
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=item B |
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=item B |
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These Net::DNS::Resolver options are also meaningful with |
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Net::DNS::Resolver::Programmable. See L for their |
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descriptions. |
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=back |
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=cut |
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sub new { |
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my ($class, %options) = @_; |
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# Create new object: |
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my $self = $class->SUPER::new(%options); |
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$self->{records} = $options{records}; |
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$self->{resolver_code} = $options{resolver_code}; |
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return $self; |
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} |
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=back |
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=head2 Instance methods |
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The following instance methods of I are also supported by |
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I: |
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=over |
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=item B: returns I |
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=item B: returns I |
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=item B: returns I |
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Performs an offline DNS query, using the statically programmed DNS RRs and/or |
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the configured dynamic resolver code. See the L constructor's C |
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and C options. See the descriptions of L
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send|Net::DNS::Resolver/search> for details about the calling syntax of these |
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methods. |
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194
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=cut |
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196
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sub send { |
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my $self = shift; |
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# We could be passed a Net::DNS::Packet object, or a set of strings; handle |
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# both |
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my ($packet, $question); |
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if (Scalar::Util::blessed($_[0]) && $_[0]->isa('Net::DNS::Packet')) { |
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$packet = $_[0]; |
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# TODO: is it a safe assumption that a packet we're passed will only |
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# contain one Question object? |
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($question) = $packet->question; |
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} else { |
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$question = Net::DNS::Question->new(@_); |
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} |
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my $domain = lc($question->qname); |
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my $rr_type = $question->qtype; |
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my $class = $question->qclass; |
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$self->_reset_errorstring; |
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216
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my ($result, $aa, @answer_rrs); |
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218
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if (defined(my $resolver_code = $self->{resolver_code})) { |
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($result, $aa, @answer_rrs) = $resolver_code->($domain, $rr_type, $class); |
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} |
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222
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4
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if ( not defined($result) or defined($rcode{$result}) ) { |
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# Valid RCODE, return a packet: |
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$aa = TRUE if not defined($aa); |
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$result = 'NOERROR' if not defined($result); |
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if (defined(my $records = $self->{records})) { |
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if (ref(my $rrs_for_domain = $records->{$domain}) eq 'ARRAY') { |
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foreach my $rr (@$rrs_for_domain) { |
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push(@answer_rrs, $rr) |
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if $rr->name eq $domain |
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and $rr->type eq $rr_type |
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and $rr->class eq $class; |
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} |
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} |
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} |
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my $response_packet = Net::DNS::Packet->new($domain, $rr_type, $class); |
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4
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$response_packet->header->qr(TRUE); |
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$response_packet->header->rcode($result); |
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$response_packet->header->aa($aa); |
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$response_packet->push(answer => @answer_rrs); |
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return $response_packet; |
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} |
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else { |
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# Invalid RCODE, signal error condition by not returning a packet: |
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$self->errorstring($result); |
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0
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return undef; |
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} |
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} |
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=item B |
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=item B: returns I |
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=item B: returns I of I |
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=item B: returns I |
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=item B: returns I |
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=item B: returns I |
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=item B: returns I |
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=item B: returns I |
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270
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=item B: returns I |
271
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See L. |
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274
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=back |
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Currently the following methods of I are B supported: |
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B, B, B, B, B, B, |
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B, B, B, B, B, B, B, |
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B, B, B, B, B, |
280
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B, B, B, B, B. |
281
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The effects of using these on I objects are |
282
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undefined. |
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284
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=head1 SEE ALSO |
285
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286
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L |
287
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288
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For availability, support, and license information, see the README file |
289
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|
included with Net::DNS::Resolver::Programmable. |
290
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291
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|
|
=head1 AUTHORS |
292
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293
|
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|
|
David Precious (BIGPRESH) C<< >> took on maintainership |
294
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in July 2017 |
295
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296
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|
Original author Julian Mehnle C<< >> |
297
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298
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|
=head1 ACKNOWLEDGEMENTS |
299
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300
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|
Dick Franks (rwfranks) |
301
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302
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|
|
(This section was added by BIGPRESH in July 2017, so currently omits |
303
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|
|
acknowledgements for those who contributed things in the past; I may |
304
|
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|
|
retrospectively add them in future.) |
305
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306
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307
|
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308
|
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|
|
=cut |
309
|
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|
310
|
|
|
|
|
|
|
TRUE; |
311
|
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312
|
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|
|
# vim:sts=4 sw=4 et |