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:
23: use strict;
24: use English;
25: use Time::HiRes qw( sleep );
26: use Socket;
27: use Socket6;
28: use IO::Select;
29:
30: use dhcp_client;
31:
32: # XXX: for debugging
33: use Data::Dumper;
34:
35: # not-yet-standard options
36: my $OPT_TIME_SERVERS = 40;
37: my $OPT_TIME_OFFSET = 41;
38:
39: # DOCSIS sub-options
40: my $DOCSIS_OPT_ORO = 1;
41: # 2 to 31 are reserved
42: my $DOCSIS_OPT_TFTP_SERVERS = 32;
43: my $DOCSIS_OPT_CONFIG_FILE_NAME = 33;
44: my $DOCSIS_OPT_SYSLOG_SERVERS = 34;
45: my $DOCSIS_OPT_TLV5 = 35;
46: my $DOCSIS_OPT_DEVICE_ID = 36;
47: my $DOCSIS_OPT_CCC = 37;
48: my $DOCSIS_OPT_VERS = 38;
49:
50: # well-known addresses
51: my $All_DHCP_Relay_Agents_and_Servers = "ff02::1:2";
52: my $All_DHCP_Servers = "ff05::1:3";
53:
54: # ports
55: my $client_port = 546;
56: my $server_port = 547;
57:
58: # create a new Solicit message
59: my $msg = dhcp_client::msg->new($MSG_DECLINE);
60:
61: # add the Client Identifier (required by DOCSIS and RFC 3315)
62: $msg->add_option($OPT_CLIENTID, dhcp_client::duid());
63:
64: # add the Server identifier (required by RFC 3315)
65: $msg->add_option($OPT_SERVERID, "InfiniteEntropy");
66:
67: # add Elapsed Time, set to 0 on first packet (required by RFC 3315)
68: $msg->add_option($OPT_ELAPSED_TIME, "\x00\x00");
69:
70: # add IA_NA for each interface (required by DOCSIS and RFC 3315)
71: # XXX: should this be a single interface only?
72: my $iaid = 0;
73: foreach my $iface (dhcp_client::iface()) {
74: my $iaaddr_option = inet_pton(AF_INET6, "1:2:3:4::");
75: $iaaddr_option .= pack("NN", 0, 0);
76: my $option_data = pack("NNN", ++$iaid, 0, 0);
77: $option_data .= pack("nn", $OPT_IAADDR, length($iaaddr_option)-8);
78: $option_data .= $iaaddr_option;
79: $msg->add_option($OPT_IA_NA, $option_data);
80: }
81:
82: # timeout parameters, from DOCSIS
83: my $IRT = $SOL_TIMEOUT;
84: my $MRT = $SOL_MAX_RT;
85: my $MRC = 4; # DOCSIS says 4, RFC 3315 says it SHOULD be 0
86: my $MRD = 0;
87:
88: # sleep a random amount of time between 0 and 1 second, required by RFC 3315
89: # XXX: this seems pretty stupid
90: sleep(rand($SOL_MAX_DELAY));
91:
92: my $RT;
93: my $count = 0;
94: my $mrd_end_time;
95: if ($MRD != 0) {
96: $mrd_end_time = time() + $MRD;
97: }
98: my $reply_msg;
99: do {
100: # create our socket, and send our Solicit
101: socket(SOCK, PF_INET6, SOCK_DGRAM, getprotobyname('udp')) || die;
102: my $addr = inet_pton(AF_INET6, $All_DHCP_Servers);
103: my $packet = $msg->packet();
104: my $send_ret = send(SOCK, $packet, 0,
105: pack_sockaddr_in6($server_port, $addr));
106: if (not defined($send_ret)) {
107: printf STDERR
108: "Error \%d sending DHCPv6 Solicit message;\n\%s\n",
109: 0+$ERRNO, $ERRNO;
110: exit(1);
111: } elsif ($send_ret != length($packet)) {
112: print STDERR "Unable to send entire DHCPv6 Solicit message.\n";
113: exit(1);
114: }
115: $count++;
116:
117: my $RAND = rand(0.2) - 0.1;
118: if (defined $RT) {
119: $RT = 2*$RT + $RAND*$RT;
120: if (($RT > $MRT) && ($MRT != 0)) {
121: $RT = $MRT + $RAND*$RT;
122: }
123: } else {
124: $RT = $IRT + $RAND*$IRT;
125: }
126:
127: my $rt_end_time = time() + $RT;
128: if (defined($mrd_end_time) && ($mrd_end_time > $rt_end_time)) {
129: $rt_end_time = $mrd_end_time;
130: }
131:
132: for (;;) {
133: my $timeout = $rt_end_time - time();
134: if ($timeout < 0) {
135: # print STDERR "Timeout waiting for DHCPv6 Advertise ",
136: # "or Reply message.\n";
137: last;
138: }
139:
140: my @ready = IO::Select->new(\*SOCK)->can_read($timeout);
141:
142: if (@ready) {
143: my $reply;
144: my $recv_ret;
145:
146: $recv_ret = recv(SOCK, $reply, 1500, 0);
147: if (not defined $recv_ret) {
148: printf STDERR
149: "Error \%d receiving DHCPv6 " .
150: "message;\n\%s\n",
151: 0+$ERRNO, $ERRNO;
152: exit(1);
153: }
154:
155: $reply_msg = dhcp_client::msg::decode($reply, 1);
156: if (($reply_msg->{msg_type} == $MSG_ADVERTISE) ||
157: ($reply_msg->{msg_type} == $MSG_REPLY)) {
158: last;
159: }
160: }
161: }
162:
163: } until ($reply_msg ||
164: (($MRC != 0) && ($count > $MRC)) ||
165: (defined($mrd_end_time) && ($mrd_end_time > time())));
166:
167: unless ($reply_msg) {
168: if (($MRC != 0) && ($count >= $MRC)) {
169: print STDERR
170: "No reply after maximum retransmission count.\n";
171: } else {
172: print STDERR
173: "No reply after maximum retransmission duration.\n";
174: }
175: }
176:
177: if ($reply_msg && ($reply_msg->{msg_type} == $MSG_REPLY)) {
178: print "Got DHCPv6 Reply message.\n";
179: exit(0);
180: }
181:
182: #$Data::Dumper::Useqq = 1;
183: #print Dumper($msg), "\n";
184: #print Dumper($msg->packet()), "\n";
185: #
186: #print "packet length: ", length($msg->packet()), "\n";
187:
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