Hi, Borrowing some code found on perlmonks.org, I am attempting a udp relay server as a programming exercise. I'm using the strawberry perl distro. It's built with mingw and has great cpan support

I learned that IO::Socket just doesn't work on Win32, so I used Socket. What I need to do next is to at least examine the win32 UDP packets in an attempt to rewrite the destination to another subnet. NetPacket::UDP doesn't give me anything to work with. I don't know where, or how many places I've gone wrong, so I'm ready for a few lessons. Here's the code I used: 

use warnings;
use strict;

use NetPacket::UDP;
 use NetPacket::Ethernet qw(:strip);
use Socket qw(:all);
use Data::Dumper

$|++; # no suffering from buffering

my $udp_port = 1434;

socket( UDPSOCK, PF_INET, SOCK_DGRAM, getprotobyname('udp') ) or die "
+socket: $!";

select( ( select(UDPSOCK), $|=1 )[0] ); # no suffering from buffering

setsockopt( UDPSOCK, SOL_SOCKET, SO_REUSEADDR, 1 )
    or die "setsockopt SO_REUSEADDR: $!";
setsockopt( UDPSOCK, SOL_SOCKET, SO_BROADCAST, 1 )
    or die "setsockopt SO_BROADCAST: $!";

my $broadcastAddr = sockaddr_in( $udp_port, INADDR_ANY );
bind( UDPSOCK, $broadcastAddr ) or die "bind failed: $!\n";

my $input;
while( my $addr = recv( UDPSOCK, $input, 1024, 0 ) ) {
    print "$addr => $input\n";
     my $ip_obj = NetPacket::UDP::decode(NetPacket::Ethernet::eth_stri
+p($addr));
     my $udp_obj = NetPacket::UDP->decode($ip_obj->{data});
    #      my $udp_obj = NetPacket::UDP->decode($ip_obj->{data});
    my $test = $ip_obj->{dest_ip};
      print " $test \n";

}

[download]
Output::

☻ ♂~¼▼Å0 => ☻

Use of uninitialized value $test in concatenation (.) or string at socket2.pl line 33.

In reply to UDP Server on Win32 by mpapet

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