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#!/usr/bin/perl
# $Id: 04-packet-truncate.t 1980 2024-06-02 10:16:33Z willem $ -*-perl-*-
#
use strict;
use warnings;
use Test::More tests => 33;
use Net::DNS;
use Net::DNS::ZoneFile;
my $source = Net::DNS::ZoneFile->new( \*DATA );
my @rr = $source->read;
for my $packet ( Net::DNS::Packet->new('query.example.') ) {
$packet->push( answer => @rr );
$packet->push( authority => @rr );
$packet->push( additional => @rr );
my $unlimited = length $packet->encode;
my %before = map { ( $_, scalar $packet->$_ ) } qw(answer authority additional);
my $truncated = length $packet->truncate($unlimited);
ok( $truncated == $unlimited, "unconstrained packet length $unlimited" );
foreach my $section (qw(answer authority additional)) {
my $before = $before{$section};
my $after = scalar( $packet->$section );
is( $after, $before, "$section section unchanged, $before RRs" );
}
ok( !$packet->header->tc, 'header->tc flag not set' );
}
for my $packet ( Net::DNS::Packet->new('query.example.') ) {
$packet->push( answer => @rr );
$packet->push( authority => @rr );
$packet->push( additional => @rr );
my $unlimited = length $packet->encode;
my %before = map { ( $_, scalar $packet->$_ ) } qw(answer authority additional);
my $truncated = length $packet->truncate; # exercise default size
ok( $truncated < $unlimited, "long packet was $unlimited, now $truncated" );
foreach my $section (qw(answer authority additional)) {
my $before = $before{$section};
my $after = scalar( $packet->$section );
ok( $after < $before, "$section section was $before RRs, now $after" );
}
ok( $packet->header->tc, 'header->tc flag set' );
}
for my $packet ( Net::DNS::Packet->new('query.example.') ) {
$packet->push( answer => @rr );
$packet->push( authority => @rr );
$packet->push( additional => @rr );
my $keyrr = Net::DNS::RR->new('tsig.example KEY 512 3 157 ARDJZgtuTDzAWeSGYPAu9uJUkX0=');
my $tsig = eval { $packet->sign_tsig($keyrr) };
my $unlimited = length $packet->encode;
my %before = map { ( $_, scalar $packet->$_ ) } qw(answer authority additional);
my $truncated = length $packet->encode(512); # explicit minimum size
ok( $truncated < $unlimited, "signed packet was $unlimited, now $truncated" );
foreach my $section (qw(answer authority additional)) {
my $before = $before{$section};
my $after = scalar( $packet->$section );
ok( $after < $before, "$section section was $before RRs, now $after" );
}
my $sigrr = $packet->sigrr;
is( $sigrr, $tsig, 'TSIG still in additional section' );
ok( $packet->header->tc, 'header->tc flag set' );
}
for my $packet ( Net::DNS::Packet->new('query.example.') ) {
my @auth = map { Net::DNS::RR->new( type => 'NS', nsdname => $_->name ) } @rr;
$packet->unique_push( authority => @auth );
$packet->push( additional => @rr );
$packet->edns->UDPsize(2048); # + all bells and whistles
my $unlimited = length $packet->encode;
my %before = map { ( $_, scalar $packet->$_ ) } qw(answer authority additional);
my $truncated = length $packet->truncate;
ok( $truncated < $unlimited, "referral packet was $unlimited, now $truncated" );
foreach my $section (qw(answer authority)) {
my $before = $before{$section};
my $after = scalar( $packet->$section );
is( $after, $before, "$section section unchanged, $before RRs" );
}
foreach my $section (qw(additional)) {
my $before = $before{$section};
my $after = scalar( $packet->$section );
ok( $after <= $before, "$section section was $before RRs, now $after" );
}
ok( !$packet->header->tc, 'header->tc flag not set' );
}
for my $packet ( Net::DNS::Packet->new('query.example.') ) {
$packet->push( additional => @rr, @rr ); # two of everything
my $unlimited = length $packet->encode;
my $truncated = length $packet->truncate( $unlimited >> 1 );
ok( $truncated, "check RRsets in truncated additional section" );
my %rrset;
foreach my $rr ( grep { $_->type eq 'A' } $packet->additional ) {
my $name = $rr->name;
$rrset{"$name. A"}++;
}
foreach my $rr ( grep { $_->type eq 'AAAA' } $packet->additional ) {
my $name = $rr->name;
$rrset{"$name. AAAA"}++;
}
my $expect = 2;
foreach my $key ( sort keys %rrset ) {
is( $rrset{$key}, $expect, "$key ; $expect RRs" );
}
}
exit;
__DATA__
a.example. A 198.41.0.4
a.example. AAAA 2001:503:ba3e::2:30
b.example. A 192.228.79.201
b.example. AAAA 2001:500:84::b
c.example. A 192.33.4.12
c.example. AAAA 2001:500:2::c
d.example. A 199.7.91.13
d.example. AAAA 2001:500:2d::d
e.example. A 192.203.230.10
f.example. A 192.5.5.241
f.example. AAAA 2001:500:2f::f
g.example. A 192.112.36.4
h.example. A 128.63.2.53
h.example. AAAA 2001:500:1::803f:235
i.example. A 192.36.148.17
i.example. AAAA 2001:7fe::53
j.example. A 192.58.128.30
j.example. AAAA 2001:503:c27::2:30
k.example. A 193.0.14.129
k.example. AAAA 2001:7fd::1
l.example. A 199.7.83.42
l.example. AAAA 2001:500:3::42
m.example. A 202.12.27.33
m.example. AAAA 2001:dc3::35
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