#!/usr/bin/env perl
use strict;
use warnings;

use base qw(Net::Server::Fork);
use Net::DHCP::Packet;
use Net::DHCP::Constants;

my $server_ip = "10.10.10.1";
my $client_ip = "10.10.10.10";
my $subnet_mask = "255.255.255.0";

__PACKAGE__->run(
    proto => 'udp',
    port  => 67,
    host  => "255.255.255.255",
);

sub process_request {
    my ($self, $client) = @_;

    my $buf = $self->{'server'}->{'udp_data'};
    my $packet = Net::DHCP::Packet->new($buf);

    my $messagetype = $packet->getOptionValue(DHO_DHCP_MESSAGE_TYPE())
+;

    if ($messagetype eq DHCPDISCOVER()) {
        send_offer($client, $packet);
    } elsif ($messagetype eq DHCPREQUEST()) {
        send_ack($client, $packet);
    }
}

sub send_offer {
    my ($client, $request) = @_;

    my $offer = Net::DHCP::Packet->new(
        Op     => BOOTREPLY(),
        Xid    => $request->xid(),
        Flags  => $request->flags(),
        Ciaddr => $request->ciaddr(),
        Yiaddr => $client_ip,
        Siaddr => $server_ip,
        Giaddr => $request->giaddr(),
        Chaddr => $request->chaddr(),
        DHO_DHCP_MESSAGE_TYPE() => DHCPOFFER(),
    );

    $offer->addOptionValue(DHO_SUBNET_MASK(), $subnet_mask);
    $offer->addOptionValue(DHO_NAME_SERVERS, $server_ip);

    $client->send($offer->serialize()) or die $!;
    print STDERR "sent offer\n";
}

sub send_ack {
    my ($client, $request) = @_;
    print STDERR "send ack\n";
}
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