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#!/usr/bin/perl
# Simple DHCP client - sending a broadcasted DHCP Discover request
use IO::Socket::INET;
use Net::DHCP::Packet;
use Net::DHCP::Constants;
use POSIX qw(setsid strftime);
# sample logger
sub logger{
my $str = shift;
print STDOUT strftime "[%d/%b/%Y:%H:%M:%S] ", localtime;
print STDOUT "$str\n";
}
logger("DHCPd tester - dummy client");
logger("Opening socket");
$handle = IO::Socket::INET->new(Proto => 'udp',
Broadcast => 1,
PeerPort => '67',
LocalPort => '68',
PeerAddr => '127.0.0.1')
|| die "Socket creation error: $@\n"; # yes, it uses $@ here
# create DHCP Packet DISCOVER
$discover = Net::DHCP::Packet->new(
Xid => 0x12345678,
DHO_DHCP_MESSAGE_TYPE() => DHCPDISCOVER(),
DHO_VENDOR_CLASS_IDENTIFIER() => 'foo',
);
logger("Sending DISCOVER to 127.0.0.1:67");
logger($discover->toString());
$handle->send($discover->serialize())
or die "Error sending:$!\n";
logger("Waiting for response from server");
$handle->recv($buf, 4096) || die("recv:$!");
logger("Got response");
$response = new Net::DHCP::Packet($buf);
logger($response->toString());
# create DHCP Packet REQUEST
$request = Net::DHCP::Packet->new(
Xid => 0x12345678,
Ciaddr => $response->yiaddr(),
DHO_DHCP_MESSAGE_TYPE() => DHCPREQUEST(),
DHO_VENDOR_CLASS_IDENTIFIER() => 'foo',
DHO_DHCP_REQUESTED_ADDRESS() => $response->yiaddr(),
);
logger("Sending REQUEST to 127.0.0.1:67");
logger($request->toString());
$handle->send($request->serialize())
or die "Error sending:$!\n";
logger("Waiting for response from server");
$handle->recv($buf, 4096) || die("recv:$!");
logger("Got response");
$response = new Net::DHCP::Packet($buf);
logger($response->toString());
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