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=head1 NAME
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Message::Util::HostPermit --- manakai: Simple host permission checker
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=head1 DESCRIPTION
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This module is part of manakai.
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=cut
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package Message::Util::HostPermit;
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use strict;
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our $VERSION = do{my @r=(q$Revision: 1.1 $=~/\d+/g);sprintf "%d."."%02d" x $#r,@r};
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=head1 METHODS
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=over 4
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=item $err = Message::Util::HostPermit->new ()
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Constructs new instance
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=cut
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sub new ($) {
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my $class = shift;
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my $self = bless {rule => []}, $class;
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$self;
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}
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sub add_rule ($$) {
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my ($self, $s) = @_;
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for (split /[\x0D\x0A]+/, $s) {
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s/\#.*$//g;
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if (/^(Allow|Deny) (.+)$/) {
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my $rule = {type => $1};
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for (split /\s+/, $2) {
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my ($name, $val) = split /=/, $_, 2;
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$rule->{'-'.$name} = $val;
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}
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push @{$self->{rule}}, $rule;
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}
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}
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}
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sub check ($$;$) {
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my ($self, $name, $port) = @_;
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my ($name, undef, undef, undef, $addr) = gethostbyname ($name);
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return 0 if !$name && !$addr;
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for my $rule (@{$self->{rule}}) {
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if ($rule->{-host}) {
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if ($self->match_host ($rule->{-host}, $name)) {
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if (!$rule->{-port} || ($rule->{-port} == $port)) {
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return ($rule->{type} eq 'Allow') ? 1 : 0;
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}
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}
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} elsif ($rule->{-ipv4}) {
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if ($self->match_ipv4 ($rule->{-ipv4}, $addr)) {
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if (!$rule->{-port} || ($rule->{-port} == $port)) {
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return ($rule->{type} eq 'Allow') ? 1 : 0;
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}
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}
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} elsif ($rule->{-ipv6}) {
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if ($self->match_ipv6 ($rule->{-ipv6}, $addr)) {
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if (!$rule->{-port} || ($rule->{-port} == $port)) {
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return ($rule->{type} eq 'Allow') ? 1 : 0;
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}
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}
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}
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}
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return 0;
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}
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sub match_host ($$$) {
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my ($self, $pattern, $host) = @_;
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if (index ($pattern, '*') > -1) {
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my @host = reverse split /\./, $host;
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my @pattern = reverse split /\./, $pattern;
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return 0 if $#host < $#pattern;
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for (0..$#pattern) {
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if ($pattern[$_] eq '*') {
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return 1;
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} elsif ($host[$_] ne $pattern[$_]) {
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return 0;
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}
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}
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return 0;
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} else {
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return $pattern eq $host ? 1 : 0;
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}
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}
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sub match_ipv4 ($$$) {
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my ($self, $pattern, $addr) = @_;
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if (length ($addr) != 4) {
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$addr =~ /([0-9]+)\.([0-9]+)\.([0-9]+)\.([0-9]+)/;
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$addr = pack 'C4', $1, $2, $3, $4;
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}
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my $mask = pack 'C4', 255, 255, 255, 255;
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if (length ($pattern) != 4) {
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$pattern =~ m!([0-9]+)\.([0-9]+)\.([0-9]+)\.([0-9]+)(?:/([0-9]+))?!;
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$pattern = pack 'C4', $1, $2, $3, $4;
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my $m = $5; $m = 32 if $m > 32;
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if (defined $m) {
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$mask = pack 'C4', (($m > 24) ? (255, 255, 255, (2**($m-24)-1) << (32-$m)) :
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($m > 16) ? (255, 255, (2**($m-16)-1) << (24-$m), 0) :
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($m > 8) ? (255, (2**($m-8)-1) << (16-$m), 0, 0) :
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((2**$m-1) << (8-$m), 0, 0, 0));
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}
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$pattern &= $mask;
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#printf '[%vd] %vd (%s) %vd (%vd) %d', $mask, $pattern, $_[1], ($addr & $mask), $addr, (($addr & $mask) eq $pattern);
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}
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return (($addr & $mask) eq $pattern) ? 1 : 0;
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}
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## TODO: IPv6 support
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sub match_ipv6 {
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return 0;
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}
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=head1 LICENSE
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Copyright 2003 Wakaba <w@suika.fam.cx>
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This program is free software; you can redistribute it and/or
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modify it under the same terms as Perl itself.
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=cut
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1; # $Date: 2003/09/17 02:34:32 $
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