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_SOLICIT);
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 (NOT ALLOWED by DOCSIS and RFC 3315)
65: $msg->add_option($OPT_SERVERID, dhcp_client::duid());
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 $option_data = pack("NNN", ++$iaid, 0, 0);
75: $msg->add_option($OPT_IA_NA, $option_data);
76: }
77:
78: # add Reconfigure Accept (required by DOCSIS)
79: $msg->add_option($OPT_RECONF_ACCEPT, "");
80:
81: # add Options Request (required by DOCSIS, recommended by RFC 3315)
82: my @oro = ( $OPT_TIME_SERVERS, $OPT_TIME_OFFSET );
83: $msg->add_option($OPT_ORO, pack("n*", @oro));
84:
85:
86: # add Vendor Class option (required by DOCSIS)
87: $msg->add_option($OPT_VENDOR_CLASS, pack("N", 4491) . "docsis3.0");
88:
89: # add Vendor-specific Information Option option (required by DOCSIS)
90: my $vsio = pack("N", 4491);
91:
92: # ORO (required by DOCSIS)
93: my @docsis_oro = ( $DOCSIS_OPT_TFTP_SERVERS );
94: $vsio .= pack("nnC*", $DOCSIS_OPT_ORO, 0+@docsis_oro, @docsis_oro);
95:
96: # TLV5 data: CMTS DOCSIS version number 3.0 (required by DOCSIS)
97: my $tlv5_data = "\x01\x02\x03\x0";
98: $vsio .= pack("nn", $DOCSIS_OPT_TLV5, length($tlv5_data)) . $tlv5_data;
99:
100: # DOCSIS Device (required by DOCSIS)
101: my $docsis_device_id = dhcp_client::mac_addr_binary();
102: $vsio .= pack("nn", $DOCSIS_OPT_DEVICE_ID, length($docsis_device_id));
103: $vsio .= $docsis_device_id;
104:
105: $msg->add_option($OPT_VENDOR_OPTS, $vsio);
106:
107: # add Rapid Commit option (required by DOCSIS)
108: $msg->add_option($OPT_RAPID_COMMIT, "");
109:
110: # timeout parameters, from DOCSIS
111: my $IRT = $SOL_TIMEOUT;
112: my $MRT = $SOL_MAX_RT;
113: my $MRC = 1; # DOCSIS says 4, RFC 3315 says it SHOULD be 0
114: my $MRD = 0;
115:
116: # sleep a random amount of time between 0 and 1 second, required by RFC 3315
117: # XXX: this seems pretty stupid
118: sleep(rand($SOL_MAX_DELAY));
119:
120: my $RT;
121: my $count = 0;
122: my $mrd_end_time;
123: if ($MRD != 0) {
124: $mrd_end_time = time() + $MRD;
125: }
126: my $reply_msg;
127: do {
128: # create our socket, and send our Solicit
129: socket(SOCK, PF_INET6, SOCK_DGRAM, getprotobyname('udp')) || die;
130: my $addr = inet_pton(AF_INET6, $All_DHCP_Servers);
131: my $packet = $msg->packet();
132: my $send_ret = send(SOCK, $packet, 0,
133: pack_sockaddr_in6($server_port, $addr));
134: if (not defined($send_ret)) {
135: printf STDERR
136: "Error \%d sending DHCPv6 Solicit message;\n\%s\n",
137: 0+$ERRNO, $ERRNO;
138: exit(1);
139: } elsif ($send_ret != length($packet)) {
140: print STDERR "Unable to send entire DHCPv6 Solicit message.\n";
141: exit(1);
142: }
143: $count++;
144:
145: my $RAND = rand(0.2) - 0.1;
146: if (defined $RT) {
147: $RT = 2*$RT + $RAND*$RT;
148: if (($RT > $MRT) && ($MRT != 0)) {
149: $RT = $MRT + $RAND*$RT;
150: }
151: } else {
152: $RT = $IRT + $RAND*$IRT;
153: }
154:
155: my $rt_end_time = time() + $RT;
156: if (defined($mrd_end_time) && ($mrd_end_time > $rt_end_time)) {
157: $rt_end_time = $mrd_end_time;
158: }
159:
160: for (;;) {
161: my $timeout = $rt_end_time - time();
162: if ($timeout < 0) {
163: # print STDERR "Timeout waiting for DHCPv6 Advertise ",
164: # "or Reply message.\n";
165: last;
166: }
167:
168: my @ready = IO::Select->new(\*SOCK)->can_read($timeout);
169:
170: if (@ready) {
171: my $reply;
172: my $recv_ret;
173:
174: $recv_ret = recv(SOCK, $reply, 1500, 0);
175: if (not defined $recv_ret) {
176: printf STDERR
177: "Error \%d receiving DHCPv6 " .
178: "message;\n\%s\n",
179: 0+$ERRNO, $ERRNO;
180: exit(1);
181: }
182:
183: $reply_msg = dhcp_client::msg::decode($reply);
184: if (($reply_msg->{msg_type} == $MSG_ADVERTISE) ||
185: ($reply_msg->{msg_type} == $MSG_REPLY)) {
186: last;
187: }
188: }
189: }
190:
191: } until ($reply_msg ||
192: (($MRC != 0) && ($count > $MRC)) ||
193: (defined($mrd_end_time) && ($mrd_end_time > time())));
194:
195: unless ($reply_msg) {
196: if (($MRC != 0) && ($count >= $MRC)) {
197: print STDERR
198: "No reply after maximum retransmission count.\n";
199: } else {
200: print STDERR
201: "No reply after maximum retransmission duration.\n";
202: }
203: }
204:
205: if ($reply_msg && ($reply_msg->{msg_type} == $MSG_REPLY)) {
206: print "Got DHCPv6 Reply message.\n";
207: exit(0);
208: }
209:
210: #$Data::Dumper::Useqq = 1;
211: #print Dumper($msg), "\n";
212: #print Dumper($msg->packet()), "\n";
213: #
214: #print "packet length: ", length($msg->packet()), "\n";
215:
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