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 Elapsed Time, set to 0 on first packet (required by RFC 3315)
65: $msg->add_option($OPT_ELAPSED_TIME, "\x00\x00");
66:
67: # add IA_NA for each interface (required by DOCSIS and RFC 3315)
68: # XXX: should this be a single interface only?
69: my $iaid = 0;
70: foreach my $iface (dhcp_client::iface()) {
71: my $option_data = pack("NNN", ++$iaid, 0, 0);
72: $msg->add_option($OPT_IA_NA, $option_data);
73: }
74:
75: # add Reconfigure Accept (required by DOCSIS)
76: $msg->add_option($OPT_RECONF_ACCEPT, "");
77:
78: # add Options Request (required by DOCSIS, recommended by RFC 3315)
79: my @oro = ( $OPT_TIME_SERVERS, $OPT_TIME_OFFSET );
80: $msg->add_option($OPT_ORO, pack("n*", @oro));
81:
82:
83: # add Vendor Class option (required by DOCSIS)
84: $msg->add_option($OPT_VENDOR_CLASS, pack("N", 4491) . "docsis3.0");
85:
86: # add Vendor-specific Information Option option (required by DOCSIS)
87: my $vsio = pack("N", 4491);
88:
89: # ORO (required by DOCSIS)
90: my @docsis_oro = ( $DOCSIS_OPT_TFTP_SERVERS );
91: $vsio .= pack("nnC*", $DOCSIS_OPT_ORO, 0+@docsis_oro, @docsis_oro);
92:
93: # TLV5 data: CMTS DOCSIS version number 3.0 (required by DOCSIS)
94: my $tlv5_data = "\x01\x02\x03\x0";
95: $vsio .= pack("nn", $DOCSIS_OPT_TLV5, length($tlv5_data)) . $tlv5_data;
96:
97: # DOCSIS Device (required by DOCSIS)
98: my $docsis_device_id = dhcp_client::mac_addr_binary();
99: $vsio .= pack("nn", $DOCSIS_OPT_DEVICE_ID, length($docsis_device_id));
100: $vsio .= $docsis_device_id;
101:
102: $msg->add_option($OPT_VENDOR_OPTS, $vsio);
103:
104: # add Rapid Commit option (required by DOCSIS)
105: $msg->add_option($OPT_RAPID_COMMIT, "");
106:
107: # timeout parameters, from DOCSIS
108: my $IRT = $SOL_TIMEOUT;
109: my $MRT = $SOL_MAX_RT;
110: my $MRC = 4; # DOCSIS says 4, RFC 3315 says it SHOULD be 0
111: my $MRD = 0;
112:
113: # sleep a random amount of time between 0 and 1 second, required by RFC 3315
114: # XXX: this seems pretty stupid
115: sleep(rand($SOL_MAX_DELAY));
116:
117: my $RT;
118: my $count = 0;
119: my $mrd_end_time;
120: if ($MRD != 0) {
121: $mrd_end_time = time() + $MRD;
122: }
123: my $reply_msg;
124: do {
125: # create our socket, and send our Solicit
126: socket(SOCK, PF_INET6, SOCK_DGRAM, getprotobyname('udp')) || die;
127: my $addr = inet_pton(AF_INET6, $All_DHCP_Servers);
128: my $packet = $msg->packet();
129: my $send_ret = send(SOCK, $packet, 0,
130: pack_sockaddr_in6($server_port, $addr));
131: if (not defined($send_ret)) {
132: printf STDERR
133: "Error \%d sending DHCPv6 Solicit message;\n\%s\n",
134: 0+$ERRNO, $ERRNO;
135: exit(1);
136: } elsif ($send_ret != length($packet)) {
137: print STDERR "Unable to send entire DHCPv6 Solicit message.\n";
138: exit(1);
139: }
140: $count++;
141:
142: my $RAND = rand(0.2) - 0.1;
143: if (defined $RT) {
144: $RT = 2*$RT + $RAND*$RT;
145: if (($RT > $MRT) && ($MRT != 0)) {
146: $RT = $MRT + $RAND*$RT;
147: }
148: } else {
149: $RT = $IRT + $RAND*$IRT;
150: }
151:
152: my $rt_end_time = time() + $RT;
153: if (defined($mrd_end_time) && ($mrd_end_time > $rt_end_time)) {
154: $rt_end_time = $mrd_end_time;
155: }
156:
157: for (;;) {
158: my $timeout = $rt_end_time - time();
159: if ($timeout < 0) {
160: # print STDERR "Timeout waiting for DHCPv6 Advertise ",
161: # "or Reply message.\n";
162: last;
163: }
164:
165: my @ready = IO::Select->new(\*SOCK)->can_read($timeout);
166:
167: if (@ready) {
168: my $reply;
169: my $recv_ret;
170:
171: $recv_ret = recv(SOCK, $reply, 1500, 0);
172: if (not defined $recv_ret) {
173: printf STDERR
174: "Error \%d receiving DHCPv6 " .
175: "message;\n\%s\n",
176: 0+$ERRNO, $ERRNO;
177: exit(1);
178: }
179:
180: $reply_msg = dhcp_client::msg::decode($reply, 1);
181: if (($reply_msg->{msg_type} == $MSG_ADVERTISE) ||
182: ($reply_msg->{msg_type} == $MSG_REPLY)) {
183: last;
184: }
185: }
186: }
187:
188: } until ($reply_msg ||
189: (($MRC != 0) && ($count > $MRC)) ||
190: (defined($mrd_end_time) && ($mrd_end_time > time())));
191:
192: unless ($reply_msg) {
193: if (($MRC != 0) && ($count >= $MRC)) {
194: print STDERR
195: "No reply after maximum retransmission count.\n";
196: } else {
197: print STDERR
198: "No reply after maximum retransmission duration.\n";
199: }
200: }
201:
202: if ($reply_msg && ($reply_msg->{msg_type} == $MSG_REPLY)) {
203: print "Got DHCPv6 Reply message.\n";
204: exit(0);
205: }
206:
207: #$Data::Dumper::Useqq = 1;
208: #print Dumper($msg), "\n";
209: #print Dumper($msg->packet()), "\n";
210: #
211: #print "packet length: ", length($msg->packet()), "\n";
212:
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