54 lines
893 B
Perl
54 lines
893 B
Perl
#!/usr/bin/env perl
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# dns shooting utility
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use strict;
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use warnings "all";
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use Net::DNS;
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my $record_type = 'TXT';
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my $record_amount = 28;
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my $domain = 'cnn.com';
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sub lookup;
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my $res = Net::DNS::Resolver->new(
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nameservers => [ '217.16.16.13', '217.16.20.13', '217.16.16.12', '217.16.22.12' ],
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recurse => 1,
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debug => 0
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);
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my $i = 0;
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while ( 1 ) {
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my $hit = 0; my $miss = 0;
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for ($i = 0; $i < 1000; $i++) {
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if (lookup($domain) == 1){ $miss++; }
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else { $hit++; }
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}
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print "hit/miss: $hit/$miss\n";
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}
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exit 0;
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sub lookup {
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my $host = shift;
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my $reply = $res->query($host, $record_type);
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if (defined($reply)) {
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my $rec_count = 0;
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foreach my $rr ($reply->answer) {
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next if ($rr->type ne $record_type);
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$rec_count++;
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}
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return 1 if ($rec_count < $record_amount);
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return 0;
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} else {
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# warn "query failed: ", $res->errorstring, "\n";
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return 1;
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}
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}
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