#! /usr/bin/perl -w# Copyright (c) 2007 by Internet Systems Consortium, Inc. ("ISC")## Permission to use, copy, modify, and distribute this software for any# purpose with or without fee is hereby granted, provided that the above# copyright notice and this permission notice appear in all copies.## THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF# MERCHANTABILITY AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES# WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN# ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT# OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.##   Internet Systems Consortium, Inc.#   950 Charter Street#   Redwood City, CA 94063#   <info@isc.org>#   http://www.isc.org/use strict;use English;use Time::HiRes qw( sleep );use Socket;use Socket6;use IO::Select;use dhcp_client;# well-known addressesmy $All_DHCP_Relay_Agents_and_Servers = "ff02::1:2";my $All_DHCP_Servers = "ff05::1:3";# portsmy $client_port = 546;my $server_port = 547;# create a new Solicit messagemy $msg = dhcp_client::msg->new(255);# add the Client Identifier (required by DOCSIS and RFC 3315)$msg->add_option($OPT_CLIENTID, dhcp_client::duid());# add Elapsed Time, set to 0 on first packet (required by RFC 3315)$msg->add_option($OPT_ELAPSED_TIME, "\x00\x00");# add IA_NA for each interface (required by DOCSIS and RFC 3315)# XXX: should this be a single interface only?my $iaid = 0;foreach my $iface (dhcp_client::iface()) {	my $option_data = pack("NNN", ++$iaid, 0, 0);	$msg->add_option($OPT_IA_NA, $option_data);}# add Options Request (required by DOCSIS, recommended by RFC 3315)my @oro = ( );$msg->add_option($OPT_ORO, pack("n*", @oro));# timeout parametersmy $IRT = $SOL_TIMEOUT;my $MRT = $SOL_MAX_RT;my $MRC = 1;	# DOCSIS says 4, RFC 3315 says it SHOULD be 0my $MRD = 0;# sleep a random amount of time between 0 and 1 second, required by RFC 3315# XXX: this seems pretty stupidsleep(rand($SOL_MAX_DELAY));my $RT;my $count = 0;my $mrd_end_time;if ($MRD != 0) {	$mrd_end_time = time() + $MRD;}my $reply_msg;do {	# create our socket, and send our bogus packet	socket(SOCK, PF_INET6, SOCK_DGRAM, getprotobyname('udp')) || die;	my $addr = inet_pton(AF_INET6, $All_DHCP_Servers);	my $packet = $msg->packet();	my $send_ret = send(SOCK, $packet, 0, 			    pack_sockaddr_in6($server_port, $addr));	if (not defined($send_ret)) {		printf STDERR 			"Error \%d sending DHCPv6 message;\n\%s\n",			0+$ERRNO, $ERRNO;		exit(1);	} elsif ($send_ret != length($packet)) {		print STDERR "Unable to send entire DHCPv6 message.\n";		exit(1);	}	$count++;	my $RAND = rand(0.2) - 0.1;	if (defined $RT) {		$RT = 2*$RT + $RAND*$RT;		if (($RT > $MRT) && ($MRT != 0)) {			$RT = $MRT + $RAND*$RT;		}	} else {		$RT = $IRT + $RAND*$IRT;	}	my $rt_end_time = time() + $RT;	if (defined($mrd_end_time) && ($mrd_end_time > $rt_end_time)) { 		$rt_end_time = $mrd_end_time;	}	for (;;) {		my $timeout = $rt_end_time - time();		if ($timeout < 0) {			last;		}		my @ready = IO::Select->new(\*SOCK)->can_read($timeout);		if (@ready) {			my $reply;			my $recv_ret;				$recv_ret = recv(SOCK, $reply, 1500, 0);			if (not defined $recv_ret) {				printf STDERR 					"Error \%d receiving DHCPv6 " . 						"message;\n\%s\n",					0+$ERRNO, $ERRNO;				exit(1);			}			$reply_msg = dhcp_client::msg::decode($reply);			if (($reply_msg->{msg_type} == $MSG_ADVERTISE) ||			    ($reply_msg->{msg_type} == $MSG_REPLY)) {			    	last;			}		}	}} until ($reply_msg || 	 (($MRC != 0) && ($count > $MRC)) ||	 (defined($mrd_end_time) && ($mrd_end_time > time())));unless ($reply_msg) {	if (($MRC != 0) && ($count >= $MRC)) {		print STDERR 			"No reply after maximum retransmission count.\n";	} else {		print STDERR 			"No reply after maximum retransmission duration.\n";	}}if ($reply_msg && ($reply_msg->{msg_type} == $MSG_REPLY)) {	print "Got DHCPv6 Reply message.\n";	exit(0);}#$Data::Dumper::Useqq = 1;#print Dumper($msg), "\n";#print Dumper($msg->packet()), "\n";##print "packet length: ", length($msg->packet()), "\n";