use strict;
use warnings;
use IO::Select;
use IO::Socket;
use Data::Dumper;
use Convert::ASN1 qw(asn_read);
use Net::LDAP::ASN qw(LDAPRequest LDAPResponse);
our $VERSION = '0.1';
use fields qw(socket target);
sub handle($$)
{
my $clientsocket = shift;
my $serversocket = shift;
asn_read($clientsocket, my $reqpdu);
log_request($reqpdu);
print $serversocket $reqpdu or die "Could not send PDU to server\n";
my $ready;
my $sel = IO::Select->new($serversocket);
for( $ready = 1 ; $ready ; $ready = $sel->can_read(0)) {
asn_read($serversocket, my $respdu) or return 1;
log_response($respdu);
print $clientsocket $respdu;
}
return 0;
}
sub log_request($)
{
my $pdu = shift;
print '-' x 80,"\n";
print "Request ASN 1:\n";
Convert::ASN1::asn_hexdump(\*STDOUT,$pdu);
print "Request Perl:\n";
my $request = $LDAPRequest->decode($pdu);
print Dumper($request);
}
sub log_response($)
{
my $pdu = shift;
print '-' x 80,"\n";
print "Response ASN 1:\n";
Convert::ASN1::asn_hexdump(\*STDOUT,$pdu);
print "Response Perl:\n";
my $response = $LDAPResponse->decode($pdu);
print Dumper($response);
}
sub run_proxy($$)
{
my $listenersock = shift;
my $targetsock = shift;
return unless ($listenersock && $targetsock);
my $sel = IO::Select->new($listenersock);
my %Handlers;
while (my @ready = $sel->can_read) {
foreach my $fh (@ready) {
if ($fh == $listenersock) {
my $psock = $listenersock->accept;
$sel->add($psock);
} else {
my $result = handle($fh,$targetsock);
if ($result) {
$sel->remove($fh);
$fh->close;
delete $Handlers{*$fh};
}
}
}
}
}
my $listenersock = IO::Socket::INET->new(
Listen => 5,
Proto => 'tcp',
Reuse => 1,
LocalPort => 7070 )
or die "Could not create listener socket: $!\n";
my $targetsock = IO::Socket::INET->new(
Proto => 'tcp',
PeerAddr => 'localhost',
PeerPort => 8080 )
or die "Could not create connection to server: $!\n";
run_proxy($listenersock,$targetsock);
1;
__END__
Hi,
I noticed in the TODO that there was a request for a simple proxy which
can act as a man-in-the-middle.
Well, the attached script provides such a proxy, it is really a simple
proxy as it can currently handle only one client at the time, it will
dump requests and responses to STDOUT both in ASN1 and as perl structure.
Cheers,
Hans
ps. If you need a little more power like returning entries on a query I
suggest to have a look at Net::LDAP::Server on CPAN.