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package IP::Authority; |
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7459
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use strict; |
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use warnings; |
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1089
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use Socket qw ( inet_aton ); |
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use vars qw ( $VERSION ); |
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1926
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$VERSION = '1305.001'; # MAY 2013, version 0.01 |
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my $singleton = undef; |
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my $ip_db; |
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my $null = substr(pack('N',0),0,1); |
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my $nullnullnull = $null . $null . $null; |
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my %auth; |
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my $ip_match = qr/^(\d|[01]?\d\d|2[0-4]\d|25[0-5])\.(\d|[01]?\d\d|2[0-4]\d|25[0-5])\.(\d|[01]?\d\d|2[0-4]\d|25[0-5])\.(\d|[01]?\d\d|2[0-4]\d|25[0-5])$/o; |
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my $bit0; |
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my $bit1; |
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my @mask; |
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my @dtoc; |
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{ |
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$bit0 = substr(pack('N',2 ** 31),0,1); |
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$bit1 = substr(pack('N',2 ** 30),0,1); |
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for (my $i = 0; $i <= 31; $i++){ |
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$mask[$i] = pack('N',2 ** (31 - $i)); |
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} |
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for (my $i = 0; $i <= 255; $i++){ |
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$dtoc[$i] = substr(pack('N',$i),3,1); |
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} |
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(my $module_dir = __FILE__) =~ s/\.pm$//; |
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local $/; # set it so <> reads all the file at once |
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open (AUTH, "< $module_dir/auth.gif") |
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or die ("couldn't read authority database: $!"); |
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binmode AUTH; |
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my $auth_ultra = ; # read in the file |
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close AUTH; |
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my $auth_num = (length $auth_ultra) / 3; |
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for (my $i = 0; $i < $auth_num; $i++){ |
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my $auth = substr($auth_ultra,3 * $i + 1,2); |
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$auth = undef if ($auth eq '--'); |
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$auth{substr($auth_ultra,3 * $i,1)} = $auth; |
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} |
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open (IP, "< $module_dir/ipauth.gif") |
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or die ("couldn't read IP database: $!"); |
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binmode IP; |
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$ip_db = ; |
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close IP; |
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} |
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sub new () |
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{ |
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my $caller = shift; |
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unless (defined $singleton){ |
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my $class = ref($caller) || $caller; |
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$singleton = bless {}, $class; |
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} |
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return $singleton; |
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} |
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sub inet_atoauth |
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{ |
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1
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my $inet_a = $_[1]; |
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if ($inet_a =~ $ip_match){ |
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return inet_ntoauth($dtoc[$1].$dtoc[$2].$dtoc[$3].$dtoc[$4]); |
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} else { |
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0
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if (defined (my $n = inet_aton($inet_a))){ |
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return inet_ntoauth($n); |
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} else { |
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return undef; |
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} |
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} |
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} |
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sub db_time |
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{ |
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return unpack("N",substr($ip_db,0,4)); |
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} |
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sub inet_ntoauth |
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{ |
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my $inet_n = $_[1] || $_[0]; |
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my $pos = 4; |
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my $byte_zero = substr($ip_db,$pos,1); |
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# loop through bits of IP address |
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for (my $i = 0; $i <= 31; $i++){ |
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if (($inet_n & $mask[$i]) eq $mask[$i]){ |
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# bit[$i] is set [binary one] |
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# - jump to next node |
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# (start of child[1] node) |
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if (($byte_zero & $bit1) eq $bit1){ |
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$pos = $pos + 1 + unpack('N', $nullnullnull . ($byte_zero ^ $bit1)); |
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} else { |
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$pos = $pos + 3 + unpack('N', $null . substr($ip_db,$pos,3)); |
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} |
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} else { |
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# bit[$i] is unset [binary zero] |
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# jump to end of this node |
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# (start of child[0] node) |
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if (($byte_zero & $bit1) eq $bit1){ |
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$pos = $pos + 1; |
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} else { |
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$pos = $pos + 3; |
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} |
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} |
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# all terminal nodes of the tree start with zeroth bit |
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# set to zero. the first bit can then be used to indicate |
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# whether we're using the first or second byte to store the |
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# country code |
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$byte_zero = substr($ip_db,$pos,1); |
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if (($byte_zero & $bit0) eq $bit0){ # country code |
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if (($byte_zero & $bit1) eq $bit1){ |
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# unpopular country code - stored in second byte |
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0
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return $auth{substr($ip_db,$pos+1,1)}; |
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} else { |
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# popular country code - stored in bits 2-7 |
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# (we already know that bit 1 is not set, so |
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# just need to unset bit 1) |
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return $auth{$byte_zero ^ $bit0}; |
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} |
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} |
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} |
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} |
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1; |
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__END__ |