Initial Commit
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Riley Schneider
317
database/perl/vendor/lib/Net/DNS/RR/SOA.pm
vendored
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317
database/perl/vendor/lib/Net/DNS/RR/SOA.pm
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package Net::DNS::RR::SOA;
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use strict;
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use warnings;
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our $VERSION = (qw$Id: SOA.pm 1819 2020-10-19 08:07:24Z willem $)[2];
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use base qw(Net::DNS::RR);
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=head1 NAME
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Net::DNS::RR::SOA - DNS SOA resource record
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=cut
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use integer;
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use Net::DNS::DomainName;
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use Net::DNS::Mailbox;
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sub _decode_rdata { ## decode rdata from wire-format octet string
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my $self = shift;
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my ( $data, $offset, @opaque ) = @_;
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( $self->{mname}, $offset ) = Net::DNS::DomainName1035->decode(@_);
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( $self->{rname}, $offset ) = Net::DNS::Mailbox1035->decode( $data, $offset, @opaque );
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@{$self}{qw(serial refresh retry expire minimum)} = unpack "\@$offset N5", $$data;
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return;
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}
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sub _encode_rdata { ## encode rdata as wire-format octet string
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my $self = shift;
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my ( $offset, @opaque ) = @_;
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my $rname = $self->{rname};
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my $rdata = $self->{mname}->encode(@_);
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$rdata .= $rname->encode( $offset + length($rdata), @opaque );
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$rdata .= pack 'N5', $self->serial, @{$self}{qw(refresh retry expire minimum)};
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return $rdata;
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}
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sub _format_rdata { ## format rdata portion of RR string.
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my $self = shift;
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my $mname = $self->{mname}->string;
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my $rname = $self->{rname}->string;
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my $serial = $self->serial;
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my $spacer = length "$serial" > 7 ? "" : "\t";
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return ($mname, $rname,
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join( "\n\t\t\t\t",
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"\t\t\t$serial$spacer\t;serial", "$self->{refresh}\t\t;refresh",
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"$self->{retry}\t\t;retry", "$self->{expire}\t\t;expire",
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"$self->{minimum}\t\t;minimum\n" ) );
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}
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sub _parse_rdata { ## populate RR from rdata in argument list
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my $self = shift;
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$self->mname(shift);
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$self->rname(shift);
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$self->serial(shift);
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for (qw(refresh retry expire minimum)) {
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$self->$_( Net::DNS::RR::ttl( {}, shift ) ) if scalar @_;
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}
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return;
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}
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sub _defaults { ## specify RR attribute default values
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my $self = shift;
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$self->_parse_rdata(qw(. . 0 4h 1h 3w 1h));
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delete $self->{serial};
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return;
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}
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sub mname {
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my $self = shift;
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$self->{mname} = Net::DNS::DomainName1035->new(shift) if scalar @_;
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return $self->{mname} ? $self->{mname}->name : undef;
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}
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sub rname {
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my $self = shift;
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$self->{rname} = Net::DNS::Mailbox1035->new(shift) if scalar @_;
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return $self->{rname} ? $self->{rname}->address : undef;
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}
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sub serial {
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my $self = shift;
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return $self->{serial} || 0 unless scalar @_; # current/default value
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my $value = shift; # replace if in sequence
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return $self->{serial} = ( $value & 0xFFFFFFFF ) if _ordered( $self->{serial}, $value );
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# unwise to assume 64-bit arithmetic, or that 32-bit integer overflow goes unpunished
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my $serial = 0xFFFFFFFF & ( $self->{serial} || 0 );
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return $self->{serial} = 0x80000000 if $serial == 0x7FFFFFFF; # wrap
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return $self->{serial} = 0x00000000 if $serial == 0xFFFFFFFF; # wrap
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return $self->{serial} = $serial + 1; # increment
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}
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sub refresh {
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my $self = shift;
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$self->{refresh} = 0 + shift if scalar @_;
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return $self->{refresh} || 0;
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}
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sub retry {
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my $self = shift;
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$self->{retry} = 0 + shift if scalar @_;
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return $self->{retry} || 0;
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}
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sub expire {
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my $self = shift;
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$self->{expire} = 0 + shift if scalar @_;
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return $self->{expire} || 0;
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}
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sub minimum {
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my $self = shift;
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$self->{minimum} = 0 + shift if scalar @_;
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return $self->{minimum} || 0;
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}
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########################################
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sub _ordered() { ## irreflexive 32-bit partial ordering
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use integer;
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my ( $n1, $n2 ) = @_;
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return 0 unless defined $n2; # ( any, undef )
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return 1 unless defined $n1; # ( undef, any )
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# unwise to assume 64-bit arithmetic, or that 32-bit integer overflow goes unpunished
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if ( $n2 < 0 ) { # fold, leaving $n2 non-negative
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$n1 = ( $n1 & 0xFFFFFFFF ) ^ 0x80000000; # -2**31 <= $n1 < 2**32
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$n2 = ( $n2 & 0x7FFFFFFF ); # 0 <= $n2 < 2**31
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}
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return $n1 < $n2 ? ( $n1 > ( $n2 - 0x80000000 ) ) : ( $n2 < ( $n1 - 0x80000000 ) );
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}
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1;
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__END__
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=head1 SYNOPSIS
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use Net::DNS;
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$rr = Net::DNS::RR->new('name SOA mname rname 0 14400 3600 1814400 3600');
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=head1 DESCRIPTION
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Class for DNS Start of Authority (SOA) resource records.
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=head1 METHODS
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The available methods are those inherited from the base class augmented
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by the type-specific methods defined in this package.
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Use of undocumented package features or direct access to internal data
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structures is discouraged and could result in program termination or
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other unpredictable behaviour.
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=head2 mname
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$mname = $rr->mname;
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$rr->mname( $mname );
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The domain name of the name server that was the
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original or primary source of data for this zone.
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=head2 rname
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$rname = $rr->rname;
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$rr->rname( $rname );
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The mailbox which identifies the person responsible
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for maintaining this zone.
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=head2 serial
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$serial = $rr->serial;
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$serial = $rr->serial(value);
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Unsigned 32 bit version number of the original copy of the zone.
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Zone transfers preserve this value.
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RFC1982 defines a strict (irreflexive) partial ordering for zone
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serial numbers. The serial number will be incremented unless the
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replacement value argument satisfies the ordering constraint.
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=head2 refresh
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$refresh = $rr->refresh;
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$rr->refresh( $refresh );
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A 32 bit time interval before the zone should be refreshed.
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=head2 retry
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$retry = $rr->retry;
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$rr->retry( $retry );
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A 32 bit time interval that should elapse before a
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failed refresh should be retried.
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=head2 expire
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$expire = $rr->expire;
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$rr->expire( $expire );
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A 32 bit time value that specifies the upper limit on
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the time interval that can elapse before the zone is no
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longer authoritative.
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=head2 minimum
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$minimum = $rr->minimum;
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$rr->minimum( $minimum );
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The unsigned 32 bit minimum TTL field that should be
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exported with any RR from this zone.
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=head1 Zone Serial Number Management
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The internal logic of the serial() method offers support for several
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widely used zone serial numbering policies.
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=head2 Strictly Sequential
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$successor = $soa->serial( SEQUENTIAL );
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The existing serial number is incremented modulo 2**32 because the
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value returned by the auxilliary SEQUENTIAL() function can never
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satisfy the serial number ordering constraint.
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=head2 Date Encoded
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$successor = $soa->serial( YYYYMMDDxx );
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The 32 bit value returned by the auxilliary YYYYMMDDxx() function will
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be used if it satisfies the ordering constraint, otherwise the serial
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number will be incremented as above.
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Serial number increments must be limited to 100 per day for the date
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information to remain useful.
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=head2 Time Encoded
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$successor = $soa->serial( UNIXTIME );
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The 32 bit value returned by the auxilliary UNIXTIME() function will
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used if it satisfies the ordering constraint, otherwise the existing
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serial number will be incremented as above.
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=head1 COPYRIGHT
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Copyright (c)1997 Michael Fuhr.
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Portions Copyright (c)2003 Chris Reinhardt.
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Portions Copyright (c)2010,2012 Dick Franks.
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All rights reserved.
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Package template (c)2009,2012 O.M.Kolkman and R.W.Franks.
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=head1 LICENSE
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Permission to use, copy, modify, and distribute this software and its
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documentation for any purpose and without fee is hereby granted, provided
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that the above copyright notice appear in all copies and that both that
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copyright notice and this permission notice appear in supporting
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documentation, and that the name of the author not be used in advertising
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or publicity pertaining to distribution of the software without specific
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prior written permission.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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DEALINGS IN THE SOFTWARE.
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=head1 SEE ALSO
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L<perl>, L<Net::DNS>, L<Net::DNS::RR>, RFC1035 Section 3.3.13, RFC1982
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=cut
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