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# Mail::SpamAssassin::NetSet - object to manipulate CIDR net IP addrs
# <@LICENSE>
# Licensed to the Apache Software Foundation (ASF) under one or more
# contributor license agreements. See the NOTICE file distributed with
# this work for additional information regarding copyright ownership.
# The ASF licenses this file to you under the Apache License, Version 2.0
# (the "License"); you may not use this file except in compliance with
# the License. You may obtain a copy of the License at:
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
# </@LICENSE>
package Mail::SpamAssassin::NetSet;
use strict;
use warnings;
use bytes;
use Mail::SpamAssassin::Util;
use Mail::SpamAssassin::Logger;
use vars qw{
@ISA $TESTCODE $NUMTESTS
};
@ISA = qw();
###########################################################################
sub new {
my $class = shift;
$class = ref($class) || $class;
my $self = { };
bless $self, $class;
$self;
}
###########################################################################
sub add_cidr {
my ($self, @nets) = @_;
local ($_);
$self->{nets} ||= [ ];
my $numadded = 0;
foreach (@nets) {
my $exclude = s/^\s*!// ? 1 : 0;
my ($ip, $bits) = m#^\s*([\d\.]+)(?:/(\d+))?\s*$#;
my $err = "netset: illegal network address given: '$_'\n";
if (!defined $ip) {
warn $err;
next;
}
elsif ($ip =~ /\.$/) {
# just use string matching; much simpler than doing smart stuff with arrays ;)
if ($ip =~ /^(\d+)\.(\d+)\.(\d+)\.$/) { $ip = "$1.$2.$3.0"; $bits = 24; }
elsif ($ip =~ /^(\d+)\.(\d+)\.$/) { $ip = "$1.$2.0.0"; $bits = 16; }
elsif ($ip =~ /^(\d+)\.$/) { $ip = "$1.0.0.0"; $bits = 8; }
else {
warn $err;
next;
}
}
$bits = 32 if (!defined $bits);
next if ($self->is_net_declared($ip, $bits, $exclude, 0));
my $mask = 0xFFffFFff ^ ((2 ** (32-$bits)) - 1);
push @{$self->{nets}}, {
mask => $mask,
exclude => $exclude,
ip => (Mail::SpamAssassin::Util::my_inet_aton($ip) & $mask),
as_string => $_
};
$numadded++;
}
$numadded;
}
sub get_num_nets {
my ($self) = @_;
if (!exists $self->{nets}) { return 0; }
return scalar @{$self->{nets}};
}
sub _nets_contains_network {
my ($self, $network, $mask, $exclude, $quiet, $netname, $declared) = @_;
return 0 unless (defined $self->{nets});
$exclude = 0 if (!defined $exclude);
$quiet = 0 if (!defined $quiet);
$declared = 0 if (!defined $declared);
foreach my $net (@{$self->{nets}}) {
# a net can not be contained by a (smaller) net with a larger mask
next if ($net->{mask} > $mask);
# check to see if the new network is contained by the old network
if (($network & $net->{mask}) == $net->{ip}) {
warn "netset: cannot " . ($exclude ? "exclude" : "include")
. " $netname as it has already been "
. ($net->{exclude} ? "excluded" : "included") . "\n" unless $quiet;
# a network that matches an excluded network isn't contained by "nets"
# return 0 if we're not just looking to see if the network was declared
return 0 if (!$declared && $net->{exclude});
return 1;
}
}
return 0;
}
sub is_net_declared {
my ($self, $network, $bits, $exclude, $quiet) = @_;
return 0 unless ($network =~ m/^\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}$/);
my $mask = 0xFFffFFff ^ ((2 ** (32-$bits)) - 1);
my $aton = Mail::SpamAssassin::Util::my_inet_aton($network);
return $self->_nets_contains_network($aton, $mask, $exclude,
$quiet, "$network/$bits", 1);
}
sub contains_ip {
my ($self, $ip) = @_;
if (!defined $self->{nets}) { return 0; }
if ($ip !~ m/^\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}$/) { return 0; }
$ip = Mail::SpamAssassin::Util::my_inet_aton($ip);
foreach my $net (@{$self->{nets}}) {
return !$net->{exclude} if (($ip & $net->{mask}) == $net->{ip});
}
0;
}
sub contains_net {
my ($self, $net) = @_;
my $mask = $net->{mask};
my $exclude = $net->{exclude};
my $network = $net->{ip};
return $self->_nets_contains_network($network, $mask, $exclude, 1, "", 0);
}
sub clone {
my ($self) = @_;
my $dup = Mail::SpamAssassin::NetSet->new();
if (defined $self->{nets}) {
@{$dup->{nets}} = @{$self->{nets}};
}
return $dup;
}
###########################################################################
1;
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