342 lines
8.3 KiB
Perl
342 lines
8.3 KiB
Perl
package Net::Connection::Match::PTR;
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use 5.006;
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use strict;
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use warnings;
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use Net::DNS;
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=head1 NAME
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Net::Connection::Match::PTR - Runs a PTR check against a Net::Connection object.
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=head1 VERSION
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Version 0.0.0
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=cut
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our $VERSION = '0.0.0';
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=head1 SYNOPSIS
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use Net::Connection::Match::PTR;
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use Net::Connection;
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# The *_ptr feilds do not need populated.
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# If left undef, they will be resulved using Net::DNS::Resolver
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my $connection_args={
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foreign_host=>'10.0.0.1',
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foreign_port=>'22',
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foreign_ptr=>'foo.foo',
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local_host=>'10.0.0.2',
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local_port=>'12322',
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local_ptr=>'foo.bar',
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proto=>'tcp4',
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state=>'ESTABLISHED',
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};
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my $conn=Net::Connection->new( $connection_args );
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# All three don't need specified, but
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# Atleast one of them must be and must not be a empty array.
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my %args=(
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ptrs=>[
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'foo.bar',
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],
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lptrs=>[
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'a.foo.bar',
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],
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fptrs=>[
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'b.foo.bar',
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],
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);
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my $checker=Net::Connection::Match::Ports->new( \%args );
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if ( $checker->match( $conn ) ){
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print "It matches.\n";
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}
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=head1 METHODS
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=head2 new
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This intiates the object.
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my %args=(
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ptrs=>[
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'foo.bar',
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],
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lptrs=>[
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'a.foo.bar',
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],
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fptrs=>[
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'b.foo.bar',
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],
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);
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my $checker=Net::Connection::Match::Ports->new( \%args );
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=head3 args
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Atleast one of the following need used.
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=keys ptrs
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This is a array of PTRs to match in for either foreign
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or local side.
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=keys fptrs
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This is a array of PTRs to match in for the foreign side.
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=keys lptrs
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This is a array of PTRs to match in for the local side.
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=cut
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sub new{
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my %args;
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if(defined($_[1])){
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%args= %{$_[1]};
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};
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# run some basic checks to make sure we have the minimum stuff required to work
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if (
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( ! defined( $args{ptrs} ) ) &&
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( ! defined( $args{fptrs} ) ) &&
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( ! defined( $args{lptrs} ) )
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){
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die ('No [fl]ptrs key specified in the argument hash');
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}
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if (
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(
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defined( $args{ptrs} ) &&
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( ! defined( $args{ptrs}[0] ) )
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) &&
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(
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defined( $args{lptrs} ) &&
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( ! defined( $args{lptrs}[0] ) )
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) &&
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(
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defined( $args{fptrs} ) &&
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( ! defined( $args{fptrs}[0] ) )
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)
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){
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die ('No ports defined in the in any of the [fl]ptrs array');
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}
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my $self = {
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ptrs=>{},
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fptrs=>{},
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lptrs=>{},
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resolver=>Net::DNS::Resolver->new,
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};
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bless $self;
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##
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## These are all stored as lower case to make matching easier.
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##
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# Process the ports for matching either
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my $ptrs_int=0;
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if ( defined( $args{ptrs} ) ){
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while (defined( $args{ptrs}[$ptrs_int] )) {
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$self->{ptrs}{ $args{ptrs}[$ptrs_int] }=lc( $args{ptrs}[$ptrs_int] );
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$ptrs_int++;
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}
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}
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# Process the ports for matching local ports
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$ptrs_int=0;
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if ( defined( $args{lptrs} ) ){
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while (defined( $args{lptrs}[$ptrs_int] )) {
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$self->{lptrs}{ $args{lptrs}[$ptrs_int] }=lc( $args{lptrs}[$ptrs_int] );
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$ptrs_int++;
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}
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}
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# Process the ports for matching foreign ports
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$ptrs_int=0;
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if ( defined( $args{fptrs} ) ){
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while (defined( $args{fptrs}[$ptrs_int] )) {
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$self->{fptrs}{ $args{fptrs}[$ptrs_int] }=lc( $args{fptrs}[$ptrs_int] );
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$ptrs_int++;
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}
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}
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return $self;
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}
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=head2 match
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Checks if a single Net::Connection object matches the stack.
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One argument is taken and that is a Net::Connection object.
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The returned value is a boolean.
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If the *_ptr feilds for the object are undef, L<Net::DNS::Resolver>
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will be used for resolving the address.
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if ( $checker->match( $conn ) ){
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print "The connection matches.\n";
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}
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=cut
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sub match{
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my $self=$_[0];
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my $object=$_[1];
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if ( !defined( $object ) ){
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return 0;
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}
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if ( ref( $object ) ne 'Net::Connection' ){
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return 0;
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}
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my $l_ptr=$object->local_ptr;
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my $f_ptr=$object->foreign_ptr;
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if ( defined( $l_ptr ) ){
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# If we have one, convert it to lower case for easier processing.
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$l_ptr=lc( $l_ptr )
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}else{
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# We don't have it. Uppercase default will prevent it from being matched.
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$l_ptr='NOTFOUND';
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# See if we can look it up.
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my $answer=$self->{resolver}->search( $object->local_host );
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if ( defined( $answer->{answer}[0] ) &&
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( ref( $answer->{answer}[0] ) eq 'Net::DNS::RR::PTR' )
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){
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$l_ptr=lc($answer->{answer}[0]->ptrdname);
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}
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}
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if ( defined( $f_ptr ) ){
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# If we have one, convert it to lower case for easier processing.
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$f_ptr=lc( $f_ptr )
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}else{
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# We don't have it. Uppercase default will prevent it from being matched.
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$f_ptr='NOTFOUND';
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# See if we can look it up.
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my $answer=$self->{resolver}->search( $object->foreign_host );
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if ( defined( $answer->{answer}[0] ) &&
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( ref( $answer->{answer}[0] ) eq 'Net::DNS::RR::PTR' )
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){
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$f_ptr=lc($answer->{answer}[0]->ptrdname);
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}
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}
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# If we matched exactly, we found it.
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if (
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defined( $self->{ptrs}{ $l_ptr } ) ||
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defined( $self->{ptrs}{ $f_ptr } ) ||
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defined( $self->{lptrs}{ $l_ptr } ) ||
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defined( $self->{fptrs}{ $f_ptr } )
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){
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return 1;
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}
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return 0;
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}
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=head1 AUTHOR
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Zane C. Bowers-Hadley, C<< <vvelox at vvelox.net> >>
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=head1 BUGS
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Please report any bugs or feature requests to C<bug-net-connection-match at rt.cpan.org>, or through
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the web interface at L<https://rt.cpan.org/NoAuth/ReportBug.html?Queue=Net-Connection-Match>. I will be notified, and then you'll
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automatically be notified of progress on your bug as I make changes.
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=head1 SUPPORT
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You can find documentation for this module with the perldoc command.
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perldoc Net::Connection::Match
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You can also look for information at:
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=over 4
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=item * RT: CPAN's request tracker (report bugs here)
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L<https://rt.cpan.org/NoAuth/Bugs.html?Dist=Net-Connection-Match>
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=item * AnnoCPAN: Annotated CPAN documentation
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L<http://annocpan.org/dist/Net-Connection-Match>
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=item * CPAN Ratings
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L<https://cpanratings.perl.org/d/Net-Connection-Match>
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=item * Search CPAN
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L<https://metacpan.org/release/Net-Connection-Match>
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=back
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=head1 ACKNOWLEDGEMENTS
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=head1 LICENSE AND COPYRIGHT
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Copyright 2019 Zane C. Bowers-Hadley.
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This program is free software; you can redistribute it and/or modify it
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under the terms of the the Artistic License (2.0). You may obtain a
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copy of the full license at:
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L<http://www.perlfoundation.org/artistic_license_2_0>
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Any use, modification, and distribution of the Standard or Modified
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Versions is governed by this Artistic License. By using, modifying or
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distributing the Package, you accept this license. Do not use, modify,
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or distribute the Package, if you do not accept this license.
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If your Modified Version has been derived from a Modified Version made
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by someone other than you, you are nevertheless required to ensure that
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your Modified Version complies with the requirements of this license.
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This license does not grant you the right to use any trademark, service
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mark, tradename, or logo of the Copyright Holder.
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This license includes the non-exclusive, worldwide, free-of-charge
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patent license to make, have made, use, offer to sell, sell, import and
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otherwise transfer the Package with respect to any patent claims
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licensable by the Copyright Holder that are necessarily infringed by the
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Package. If you institute patent litigation (including a cross-claim or
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counterclaim) against any party alleging that the Package constitutes
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direct or contributory patent infringement, then this Artistic License
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to you shall terminate on the date that such litigation is filed.
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Disclaimer of Warranty: THE PACKAGE IS PROVIDED BY THE COPYRIGHT HOLDER
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AND CONTRIBUTORS "AS IS' AND WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES.
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THE IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
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PURPOSE, OR NON-INFRINGEMENT ARE DISCLAIMED TO THE EXTENT PERMITTED BY
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YOUR LOCAL LAW. UNLESS REQUIRED BY LAW, NO COPYRIGHT HOLDER OR
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CONTRIBUTOR WILL BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, OR
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CONSEQUENTIAL DAMAGES ARISING IN ANY WAY OUT OF THE USE OF THE PACKAGE,
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EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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=cut
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1; # End of Net::Connection::Match
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