forked from extern/shorewall_code
875f5c7026
git-svn-id: https://shorewall.svn.sourceforge.net/svnroot/shorewall/trunk@9075 fbd18981-670d-0410-9b5c-8dc0c1a9a2bb
662 lines
17 KiB
Perl
662 lines
17 KiB
Perl
#
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# Shorewall-perl 4.2 -- /usr/share/shorewall-perl/Shorewall/IPAddrs.pm
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#
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# This program is under GPL [http://www.gnu.org/licenses/old-licenses/gpl-2.0.txt]
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#
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# (c) 2007 - Tom Eastep (teastep@shorewall.net)
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#
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# Complete documentation is available at http://shorewall.net
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of Version 2 of the GNU General Public License
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# as published by the Free Software Foundation.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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#
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# This module provides interfaces for dealing with IPv4 addresses, protocol names, and
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# port names. It also exports functions for validating protocol- and port- (service)
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# related constructs.
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#
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package Shorewall::IPAddrs;
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require Exporter;
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use Shorewall::Config qw( :DEFAULT split_list require_capability in_hex8 F_IPV4 F_IPV6 );
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use strict;
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our @ISA = qw(Exporter);
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our @EXPORT = qw( ALLIPv4
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ALLIPv6
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IPv6_MULTICAST
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IPv6_LINKLOCAL
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IPv6_SITELOCAL
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IPv6_LINKLOCAL
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IPv6_LOOPBACK
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IPv6_LINK_ALLNODES
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IPv6_LINK_ALLRTRS
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IPv6_SITE_ALLNODES
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IPv6_SITE_ALLRTRS
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ALLIP
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ALL
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TCP
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UDP
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ICMP
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DCCP
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IPv6_ICMP
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SCTP
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validate_address
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validate_net
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decompose_net
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validate_host
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validate_range
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ip_range_explicit
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expand_port_range
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allipv4
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allipv6
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allip
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rfc1918_networks
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resolve_proto
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proto_name
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validate_port
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validate_portpair
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validate_port_list
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validate_icmp
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validate_icmp6
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);
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our @EXPORT_OK = qw( );
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our $VERSION = 4.3.0;
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#
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# Some IPv4/6 useful stuff
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#
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our @allipv4 = ( '0.0.0.0/0' );
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our @allipv6 = ( '::/0' );
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our $family;
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use constant { ALLIPv4 => '0.0.0.0/0' ,
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ALLIPv6 => '::/0' ,
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IPv6_MULTICAST => 'FF00::/10' ,
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IPv6_LINKLOCAL => 'FF80::/10' ,
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IPv6_SITELOCAL => 'FFC0::/10' ,
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IPv6_LINKLOCAL => 'FF80::/10' ,
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IPv6_LOOPBACK => '::1' ,
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IPv6_LINK_ALLNODES => 'FF01::1' ,
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IPv6_LINK_ALLRTRS => 'FF01::2' ,
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IPv6_SITE_ALLNODES => 'FF02::1' ,
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IPv6_SITE_ALLRTRS => 'FF02::2' ,
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ICMP => 1,
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TCP => 6,
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UDP => 17,
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DCCP => 33,
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IPv6_ICMP => 58,
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SCTP => 132 };
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our @rfc1918_networks = ( "10.0.0.0/8", "172.16.0.0/12", "192.168.0.0/16" );
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#
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# Initialize globals -- we take this novel approach to globals initialization to allow
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# the compiler to run multiple times in the same process. The
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# initialize() function does globals initialization for this
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# module and is called from an INIT block below. The function is
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# also called by Shorewall::Compiler::compiler at the beginning of
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# the second and subsequent calls to that function.
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#
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sub initialize( $ ) {
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$family = shift;
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}
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INIT {
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initialize( F_IPV4 );
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}
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sub vlsm_to_mask( $ ) {
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my $vlsm = $_[0];
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in_hex8 ( ( 0xFFFFFFFF << ( 32 - $vlsm ) ) && 0xFFFFFFFF );
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}
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sub valid_4address( $ ) {
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my $address = $_[0];
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my @address = split /\./, $address;
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return 0 unless @address == 4;
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for my $a ( @address ) {
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return 0 unless $a =~ /^\d+$/ && $a < 256;
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}
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1;
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}
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sub validate_4address( $$ ) {
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my ( $addr, $allow_name ) = @_;
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my @addrs = ( $addr );
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unless ( valid_4address $addr ) {
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fatal_error "Invalid IP Address ($addr)" unless $allow_name;
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fatal_error "Unknown Host ($addr)" unless (@addrs = gethostbyname $addr);
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if ( defined wantarray ) {
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shift @addrs for (1..4);
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for ( @addrs ) {
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$_ = inet_htoa $_;
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}
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}
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}
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defined wantarray ? wantarray ? @addrs : $addrs[0] : undef;
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}
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sub decodeaddr( $ ) {
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my $address = $_[0];
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my @address = split /\./, $address;
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my $result = shift @address;
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for my $a ( @address ) {
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$result = ( $result << 8 ) | $a;
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}
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$result;
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}
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sub encodeaddr( $ ) {
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my $addr = $_[0];
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my $result = $addr & 0xff;
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for my $i ( 1..3 ) {
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my $a = ($addr = $addr >> 8) & 0xff;
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$result = "$a.$result";
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}
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$result;
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}
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sub validate_4net( $$ ) {
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my ($net, $vlsm, $rest) = split( '/', $_[0], 3 );
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my $allow_name = $_[1];
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$net = '' unless defined $net;
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fatal_error "Missing address" if $net eq '';
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fatal_error "An ipset name ($net) is not allowed in this context" if substr( $net, 0, 1 ) eq '+';
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if ( defined $vlsm ) {
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fatal_error "Invalid VLSM ($vlsm)" unless $vlsm =~ /^\d+$/ && $vlsm <= 32;
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fatal_error "Invalid Network address ($_[0])" if defined $rest;
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fatal_error "Invalid IP address ($net)" unless valid_4address $net;
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} else {
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fatal_error "Invalid Network address ($_[0])" if $_[0] =~ '/' || ! defined $net;
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validate_4address $net, $_[1];
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$vlsm = 32;
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}
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if ( defined wantarray ) {
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fatal_error "Internal Error in validate_net()" if $allow_name;
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if ( wantarray ) {
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( decodeaddr( $net ) , $vlsm );
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} else {
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"$net/$vlsm";
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}
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}
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}
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sub validate_4range( $$ ) {
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my ( $low, $high ) = @_;
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validate_4address $low, 0;
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validate_4address $high, 0;
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my $first = decodeaddr $low;
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my $last = decodeaddr $high;
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fatal_error "Invalid IP Range ($low-$high)" unless $first <= $last;
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}
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sub validate_4host( $$ ) {
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my ( $host, $allow_name ) = $_[0];
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if ( $host =~ /^(\d+\.\d+\.\d+\.\d+)-(\d+\.\d+\.\d+\.\d+)$/ ) {
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validate_4range $1, $2;
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} else {
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validate_4net( $host, $allow_name );
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}
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}
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sub ip_range_explicit( $ ) {
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my $range = $_[0];
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my @result;
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my ( $low, $high ) = split /-/, $range;
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validate_address $low, 0;
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push @result, $low;
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if ( defined $high ) {
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validate_faddress $high, 0;
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my $first = decodeaddr $low;
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my $last = decodeaddr $high;
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my $diff = $last - $first;
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fatal_error "Invalid IP Range ($range)" unless $diff >= 0 && $diff <= 256;
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while ( ++$first <= $last ) {
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push @result, encodeaddr( $first );
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}
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}
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@result;
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}
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sub decompose_net( $ ) {
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my $net = $_[0];
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return ( qw/0x00000000 0x00000000/ ) if $net eq '-';
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( $net, my $vlsm ) = validate_net( $net , 0 );
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( in_hex8( $net ) , vlsm_to_mask( $vlsm ) );
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}
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sub allipv4() {
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@allipv4;
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}
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sub allipv6() {
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@allipv6;
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}
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sub rfc1918_networks() {
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@rfc1918_networks
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}
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#
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# Protocol/port validation
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#
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our %nametoproto = ( all => 0, ALL => 0, icmp => 1, ICMP => 1, tcp => 6, TCP => 6, udp => 17, UDP => 17 );
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our @prototoname = ( 'all', 'icmp', '', '', '', '', 'tcp', '', '', '', '', '', '', '', '', '', '', 'udp' );
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#
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# Returns the protocol number if the passed argument is a valid protocol number or name. Returns undef otherwise
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#
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sub resolve_proto( $ ) {
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my $proto = $_[0];
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my $number;
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$proto =~ /^(\d+)$/ ? $proto <= 65535 ? $proto : undef : defined( $number = $nametoproto{$proto} ) ? $number : scalar getprotobyname $proto;
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}
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sub proto_name( $ ) {
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my $proto = $_[0];
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$proto =~ /^(\d+)$/ ? $prototoname[ $proto ] || scalar getprotobynumber $proto : $proto
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}
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sub validate_port( $$ ) {
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my ($proto, $port) = @_;
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my $value;
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if ( $port =~ /^(\d+)$/ ) {
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return $port if $port <= 65535;
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} else {
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$proto = proto_name $proto if $proto =~ /^(\d+)$/;
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$value = getservbyname( $port, $proto );
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}
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fatal_error "Invalid/Unknown $proto port/service ($port)" unless defined $value;
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$value;
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}
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sub validate_portpair( $$ ) {
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my ($proto, $portpair) = @_;
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fatal_error "Invalid port range ($portpair)" if $portpair =~ tr/:/:/ > 1;
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$portpair = "0$portpair" if substr( $portpair, 0, 1 ) eq ':';
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$portpair = "${portpair}65535" if substr( $portpair, -1, 1 ) eq ':';
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my @ports = split /:/, $portpair, 2;
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$_ = validate_port( $proto, $_) for ( @ports );
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if ( @ports == 2 ) {
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fatal_error "Invalid port range ($portpair)" unless $ports[0] < $ports[1];
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}
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join ':', @ports;
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}
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sub validate_port_list( $$ ) {
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my $result = '';
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my ( $proto, $list ) = @_;
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my @list = split_list( $list, 'port' );
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if ( @list > 1 && $list =~ /:/ ) {
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require_capability( 'XMULTIPORT' , 'Port ranges in a port list', '' );
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}
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$proto = proto_name $proto;
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for ( @list ) {
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my $value = validate_portpair( $proto , $_ );
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$result = $result ? join ',', $result, $value : $value;
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}
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$result;
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}
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my %icmp_types = ( any => 'any',
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'echo-reply' => 0,
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'destination-unreachable' => 3,
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'network-unreachable' => '3/0',
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'host-unreachable' => '3/1',
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'protocol-unreachable' => '3/2',
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'port-unreachable' => '3/3',
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'fragmentation-needed' => '3/4',
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'source-route-failed' => '3/5',
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'network-unknown' => '3/6',
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'host-unknown' => '3/7',
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'network-prohibited' => '3/9',
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'host-prohibited' => '3/10',
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'TOS-network-unreachable' => '3/11',
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'TOS-host-unreachable' => '3/12',
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'communication-prohibited' => '3/13',
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'host-precedence-violation' => '3/14',
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'precedence-cutoff' => '3/15',
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'source-quench' => 4,
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'redirect' => 5,
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'network-redirect' => '5/0',
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'host-redirect' => '5/1',
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'TOS-network-redirect' => '5/2',
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'TOS-host-redirect' => '5/3',
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'echo-request' => '8',
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'router-advertisement' => 9,
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'router-solicitation' => 10,
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'time-exceeded' => 11,
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'ttl-zero-during-transit' => '11/0',
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'ttl-zero-during-reassembly' => '11/1',
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'parameter-problem' => 12,
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'ip-header-bad' => '12/0',
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'required-option-missing' => '12/1',
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'timestamp-request' => 13,
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'timestamp-reply' => 14,
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'address-mask-request' => 17,
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'address-mask-reply' => 18 );
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sub validate_icmp( $ ) {
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fatal_error "IPv4 ICMP not allowed in an IPv6 Rule" unless $family == F_IPV4;
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my $type = $_[0];
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my $value = $icmp_types{$type};
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return $value if defined $value;
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if ( $type =~ /^(\d+)(\/(\d+))?$/ ) {
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return $type if $1 < 256 && ( ! $2 || $3 < 256 );
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}
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fatal_error "Invalid ICMP Type ($type)"
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}
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#
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# Expands a port range into a minimal list of ( port, mask ) pairs.
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# Each port and mask are expressed as 4 hex nibbles without a leading '0x'.
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#
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# Example:
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#
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# DB<3> @foo = Shorewall::IPAddrs::expand_port_range( 6, '110:' ); print "@foo\n"
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# 006e fffe 0070 fff0 0080 ff80 0100 ff00 0200 fe00 0400 fc00 0800 f800 1000 f000 2000 e000 4000 c000 8000 8000
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#
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sub expand_port_range( $$ ) {
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my ( $proto, $range ) = @_;
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if ( $range =~ /^(.*):(.*)$/ ) {
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my ( $first, $last ) = ( $1, $2);
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my @result;
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fatal_error "Invalid port range ($range)" unless $first ne '' or $last ne '';
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#
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# Supply missing first/last port number
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#
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$first = 0 if $first eq '';
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$last = 65535 if $last eq '';
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#
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# Validate the ports
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#
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( $first , $last ) = ( validate_port( $proto, $first ) , validate_port( $proto, $last ) );
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$last++; #Increment last address for limit testing.
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#
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# Break the range into groups:
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#
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# - If the first port in the remaining range is odd, then the next group is ( <first>, ffff ).
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# - Otherwise, find the largest power of two P that divides the first address such that
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# the remaining range has less than or equal to P ports. The next group is
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# ( <first> , ~( P-1 ) ).
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#
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while ( ( my $ports = ( $last - $first ) ) > 0 ) {
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my $mask = 0xffff; #Mask for current ports in group.
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my $y = 2; #Next power of two to test
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my $z = 1; #Number of ports in current group (Previous value of $y).
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while ( ( ! ( $first % $y ) ) && ( $y <= $ports ) ) {
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$mask <<= 1;
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$z = $y;
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$y <<= 1;
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}
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#
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#
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push @result, sprintf( '%04x', $first ) , sprintf( '%04x' , $mask & 0xffff );
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$first += $z;
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}
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fatal_error "Invalid port range ($range)" unless @result; # first port > last port
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@result;
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} else {
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( sprintf( '%04x' , validate_port( $proto, $range ) ) , 'ffff' );
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}
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}
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sub valid_6address( $ ) {
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my $address = $_[0];
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my @address = split /:/, $address;
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my $max;
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if ( $address[-1] && $address[-1] =~ /^\d+\.\d+\.\d+\.\d+$/ ) {
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return 0 unless valid_4address pop @address;
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$max = 6;
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$address = join ':', @address;
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} else {
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$max = 8;
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}
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return 0 if @address > $max;
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return 0 unless ( @address == $max ) || $address =~ /::/;
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return 0 if $address =~ /:::/ || $address =~ /::.*::/;
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if ( $address =~ /^:/ ) {
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unless ( $address eq '::' ) {
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return 0 if $address =~ /:$/ || $address =~ /^:.*::/;
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}
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} elsif ( $address =~ /:$/ ) {
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return 0 if $address =~ /::.*:$/;
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}
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for my $a ( @address ) {
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return 0 unless $a eq '' || ( $a =~ /^[a-fA-f\d]+$/ && oct "0x$a" < 65536 );
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}
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1;
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}
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sub validate_6address( $$ ) {
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my ( $addr, $allow_name ) = @_;
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my @addrs = ( $addr );
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unless ( valid_6address $addr ) {
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fatal_error "Invalid IPv6 Address ($addr)" unless $allow_name;
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require Socket6;
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fatal_error "Unknown Host ($addr)" unless (@addrs = Socket6::gethostbyname2( $addr, Socket6::AF_INET6()));
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|
|
if ( defined wantarray ) {
|
|
shift @addrs for (1..4);
|
|
for ( @addrs ) {
|
|
$_ = Socket6::inet_ntop( Socket6::AF_INET6(), $_ );
|
|
}
|
|
}
|
|
}
|
|
|
|
defined wantarray ? wantarray ? @addrs : $addrs[0] : undef;
|
|
}
|
|
|
|
sub validate_6net( $$ ) {
|
|
my ($net, $vlsm, $rest) = split( '/', $_[0], 3 );
|
|
my $allow_name = $_[1];
|
|
|
|
fatal_error "An ipset name ($net) is not allowed in this context" if substr( $net, 0, 1 ) eq '+';
|
|
|
|
if ( defined $vlsm ) {
|
|
fatal_error "Invalid VLSM ($vlsm)" unless $vlsm =~ /^\d+$/ && $vlsm <= 128;
|
|
fatal_error "Invalid Network address ($_[0])" if defined $rest;
|
|
fatal_error "Invalid IPv6 address ($net)" unless valid_6address $net;
|
|
} else {
|
|
fatal_error "Invalid Network address ($_[0])" if $_[0] =~ '/' || ! defined $net;
|
|
validate_6address $net, $allow_name;
|
|
}
|
|
}
|
|
|
|
#
|
|
# Note: the input is assumed to be a valid IPv6 address
|
|
#
|
|
sub normalize_6addr( $ ) {
|
|
my $addr = shift;
|
|
|
|
while ( $addr =~ tr/:/:/ < 6 ) {
|
|
$addr =~ s/::/:0::/;
|
|
}
|
|
|
|
$addr =~ s/::/:0:/;
|
|
|
|
$addr;
|
|
}
|
|
|
|
sub validate_6range( $$ ) {
|
|
my ( $low, $high ) = @_;
|
|
|
|
validate_6address $low, 0;
|
|
validate_6address $high, 0;
|
|
|
|
my @low = split ":", normalize_6addr( $low );
|
|
my @high = split ":", normalize_6addr( $high );
|
|
|
|
|
|
while ( @low ) {
|
|
my ( $l, $h) = ( shift @low, shift @high );
|
|
next if hex "0x$l" == hex "0x$h";
|
|
return 1 if hex "0x$l" < hex "0x$h";
|
|
last;
|
|
}
|
|
|
|
fatal_error "Invalid IPv6 Range ($low-$high)";
|
|
}
|
|
|
|
sub validate_6host( $$ ) {
|
|
my ( $host, $allow_name ) = $_[0];
|
|
|
|
if ( $host =~ /^(.*:.*)-(.*:.*)$/ ) {
|
|
validate_6range $1, $2;
|
|
} else {
|
|
validate_6net( $host, $allow_name );
|
|
}
|
|
}
|
|
|
|
my %ipv6_icmp_types = ( any => 'any',
|
|
'destination-unreachable' => 1,
|
|
'no-route' => '1/0',
|
|
'communication-prohibited' => '1/1',
|
|
'address-unreachable' => '1/2',
|
|
'port-unreachable' => '1/3',
|
|
'packet-too-big' => 2,
|
|
'time-exceeded' => 3,
|
|
'ttl-exceeded' => 3,
|
|
'ttl-zero-during-transit' => '3/0',
|
|
'ttl-zero-during-reassembly' => '3/1',
|
|
'parameter-problem' => 4,
|
|
'bad-header' => '4/0',
|
|
'unknown-header-type' => '4/1',
|
|
'unknown-option' => '4/2',
|
|
'echo-request' => 128,
|
|
'echo-reply' => 129,
|
|
'router-solicitation' => 133,
|
|
'router-advertisement' => 134,
|
|
'neighbour-solicitation' => 135,
|
|
'neighbour-advertisement' => 136,
|
|
redirect => 137 );
|
|
|
|
|
|
sub validate_icmp6( $ ) {
|
|
fatal_error "IPv6 ICMP not allowed in an IPv4 Rule" unless $family == F_IPV6;
|
|
my $type = $_[0];
|
|
|
|
my $value = $ipv6_icmp_types{$type};
|
|
|
|
return $value if defined $value;
|
|
|
|
if ( $type =~ /^(\d+)(\/(\d+))?$/ ) {
|
|
return $type if $1 < 256 && ( ! $2 || $3 < 256 );
|
|
}
|
|
|
|
fatal_error "Invalid IPv6 ICMP Type ($type)"
|
|
}
|
|
|
|
sub ALLIP() {
|
|
$family == F_IPV4 ? ALLIPv4 : ALLIPv6;
|
|
}
|
|
|
|
sub allip() {
|
|
$family == F_IPV4 ? ALLIPv4 : ALLIPv6;
|
|
}
|
|
|
|
sub valid_address ( $ ) {
|
|
$family == F_IPV4 ? valid_4address( $_[0] ) : valid_6address( $_[0] );
|
|
}
|
|
|
|
sub validate_address ( $$ ) {
|
|
$family == F_IPV4 ? validate_4address( $_[0], $_[1] ) : validate_6address( $_[0], $_[1] );
|
|
}
|
|
|
|
sub validate_net ( $$ ) {
|
|
$family == F_IPV4 ? validate_4net( $_[0], $_[1] ) : validate_6net( $_[0], $_[1] );
|
|
}
|
|
|
|
sub validate_range ($$ ) {
|
|
$family == F_IPV4 ? validate_4range( $_[0], $_[1] ) : validate_6range( $_[0], $_[1] );
|
|
}
|
|
|
|
sub validate_host ($$ ) {
|
|
$family == F_IPV4 ? validate_4host( $_[0], $_[1] ) : validate_6host( $_[0], $_[1] );
|
|
}
|
|
|
|
1;
|