1#! /usr/bin/perl -w
2
3# Copyright (c) 2007,2009 by Internet Systems Consortium, Inc. ("ISC")
4#
5# Permission to use, copy, modify, and distribute this software for any
6# purpose with or without fee is hereby granted, provided that the above
7# copyright notice and this permission notice appear in all copies.
8#
9# THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES
10# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
11# MERCHANTABILITY AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR
12# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
13# WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
14# ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
15# OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
16#
17#   Internet Systems Consortium, Inc.
18#   950 Charter Street
19#   Redwood City, CA 94063
20#   <info@isc.org>
21#   https://www.isc.org/
22
23use strict;
24use English;
25use Time::HiRes qw( sleep );
26use Socket;
27use Socket6;
28use IO::Select;
29
30use dhcp_client;
31
32# well-known addresses
33my $All_DHCP_Relay_Agents_and_Servers = "ff02::1:2";
34my $All_DHCP_Servers = "ff05::1:3";
35
36# ports
37my $client_port = 546;
38my $server_port = 547;
39
40# create a new Solicit message
41my $msg = dhcp_client::msg->new(255);
42
43# add the Client Identifier (required by DOCSIS and RFC 3315)
44$msg->add_option($OPT_CLIENTID, dhcp_client::duid());
45
46# add Elapsed Time, set to 0 on first packet (required by RFC 3315)
47$msg->add_option($OPT_ELAPSED_TIME, "\x00\x00");
48
49# add IA_NA for each interface (required by DOCSIS and RFC 3315)
50# XXX: should this be a single interface only?
51my $iaid = 0;
52foreach my $iface (dhcp_client::iface()) {
53	my $option_data = pack("NNN", ++$iaid, 0, 0);
54	$msg->add_option($OPT_IA_NA, $option_data);
55}
56
57# add Options Request (required by DOCSIS, recommended by RFC 3315)
58my @oro = ( );
59$msg->add_option($OPT_ORO, pack("n*", @oro));
60
61# timeout parameters
62my $IRT = $SOL_TIMEOUT;
63my $MRT = $SOL_MAX_RT;
64my $MRC = 1;	# DOCSIS says 4, RFC 3315 says it SHOULD be 0
65my $MRD = 0;
66
67# sleep a random amount of time between 0 and 1 second, required by RFC 3315
68# XXX: this seems pretty stupid
69sleep(rand($SOL_MAX_DELAY));
70
71my $RT;
72my $count = 0;
73my $mrd_end_time;
74if ($MRD != 0) {
75	$mrd_end_time = time() + $MRD;
76}
77my $reply_msg;
78do {
79	# create our socket, and send our bogus packet
80	socket(SOCK, PF_INET6, SOCK_DGRAM, getprotobyname('udp')) || die;
81	my $addr = inet_pton(AF_INET6, $All_DHCP_Servers);
82	my $packet = $msg->packet();
83	my $send_ret = send(SOCK, $packet, 0,
84			    pack_sockaddr_in6($server_port, $addr));
85	if (not defined($send_ret)) {
86		printf STDERR
87			"Error \%d sending DHCPv6 message;\n\%s\n",
88			0+$ERRNO, $ERRNO;
89		exit(1);
90	} elsif ($send_ret != length($packet)) {
91		print STDERR "Unable to send entire DHCPv6 message.\n";
92		exit(1);
93	}
94	$count++;
95
96	my $RAND = rand(0.2) - 0.1;
97	if (defined $RT) {
98		$RT = 2*$RT + $RAND*$RT;
99		if (($RT > $MRT) && ($MRT != 0)) {
100			$RT = $MRT + $RAND*$RT;
101		}
102	} else {
103		$RT = $IRT + $RAND*$IRT;
104	}
105
106	my $rt_end_time = time() + $RT;
107	if (defined($mrd_end_time) && ($mrd_end_time > $rt_end_time)) {
108		$rt_end_time = $mrd_end_time;
109	}
110
111	for (;;) {
112		my $timeout = $rt_end_time - time();
113		if ($timeout < 0) {
114			last;
115		}
116
117		my @ready = IO::Select->new(\*SOCK)->can_read($timeout);
118
119		if (@ready) {
120			my $reply;
121			my $recv_ret;
122
123			$recv_ret = recv(SOCK, $reply, 1500, 0);
124			if (not defined $recv_ret) {
125				printf STDERR
126					"Error \%d receiving DHCPv6 " .
127						"message;\n\%s\n",
128					0+$ERRNO, $ERRNO;
129				exit(1);
130			}
131
132			$reply_msg = dhcp_client::msg::decode($reply);
133			if (($reply_msg->{msg_type} == $MSG_ADVERTISE) ||
134			    ($reply_msg->{msg_type} == $MSG_REPLY)) {
135			    	last;
136			}
137		}
138	}
139
140} until ($reply_msg ||
141	 (($MRC != 0) && ($count > $MRC)) ||
142	 (defined($mrd_end_time) && ($mrd_end_time > time())));
143
144unless ($reply_msg) {
145	if (($MRC != 0) && ($count >= $MRC)) {
146		print STDERR
147			"No reply after maximum retransmission count.\n";
148	} else {
149		print STDERR
150			"No reply after maximum retransmission duration.\n";
151	}
152}
153
154if ($reply_msg && ($reply_msg->{msg_type} == $MSG_REPLY)) {
155	print "Got DHCPv6 Reply message.\n";
156	exit(0);
157}
158
159#$Data::Dumper::Useqq = 1;
160#print Dumper($msg), "\n";
161#print Dumper($msg->packet()), "\n";
162#
163#print "packet length: ", length($msg->packet()), "\n";
164
165