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_REQUEST);
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 DOCSIS and RFC 3315)
65: # but use *our* DUID
66: $msg->add_option($OPT_SERVERID, dhcp_client::duid());
67:
68: # add Elapsed Time, set to 0 on first packet (required by RFC 3315)
69: $msg->add_option($OPT_ELAPSED_TIME, "\x00\x00");
70:
71: # add IA_NA for each interface (required by DOCSIS and RFC 3315)
72: # XXX: should this be a single interface only?
73: my $iaid = 0;
74: foreach my $iface (dhcp_client::iface()) {
75: my $option_data = pack("NNN", ++$iaid, 0, 0);
76: $msg->add_option($OPT_IA_NA, $option_data);
77: }
78:
79: # add Reconfigure Accept (required by DOCSIS)
80: $msg->add_option($OPT_RECONF_ACCEPT, "");
81:
82: # add Options Request (required by DOCSIS, recommended by RFC 3315)
83: my @oro = ( $OPT_TIME_SERVERS, $OPT_TIME_OFFSET );
84: $msg->add_option($OPT_ORO, pack("n*", @oro));
85:
86:
87: # add Vendor Class option (required by DOCSIS)
88: $msg->add_option($OPT_VENDOR_CLASS, pack("N", 4491) . "docsis3.0");
89:
90: # add Vendor-specific Information Option option (required by DOCSIS)
91: my $vsio = pack("N", 4491);
92:
93: # ORO (required by DOCSIS)
94: my @docsis_oro = ( $DOCSIS_OPT_TFTP_SERVERS );
95: $vsio .= pack("nnC*", $DOCSIS_OPT_ORO, 0+@docsis_oro, @docsis_oro);
96:
97: # TLV5 data: CMTS DOCSIS version number 3.0 (required by DOCSIS)
98: my $tlv5_data = "\x01\x02\x03\x0";
99: $vsio .= pack("nn", $DOCSIS_OPT_TLV5, length($tlv5_data)) . $tlv5_data;
100:
101: # DOCSIS Device (required by DOCSIS)
102: my $docsis_device_id = dhcp_client::mac_addr_binary();
103: $vsio .= pack("nn", $DOCSIS_OPT_DEVICE_ID, length($docsis_device_id));
104: $vsio .= $docsis_device_id;
105:
106: $msg->add_option($OPT_VENDOR_OPTS, $vsio);
107:
108: # add Rapid Commit option (required by DOCSIS)
109: $msg->add_option($OPT_RAPID_COMMIT, "");
110:
111: # timeout parameters, from DOCSIS
112: my $IRT = $SOL_TIMEOUT;
113: my $MRT = $SOL_MAX_RT;
114: my $MRC = 1; # DOCSIS says 4, RFC 3315 says it SHOULD be 0
115: my $MRD = 0;
116:
117: # sleep a random amount of time between 0 and 1 second, required by RFC 3315
118: # XXX: this seems pretty stupid
119: sleep(rand($SOL_MAX_DELAY));
120:
121: my $RT;
122: my $count = 0;
123: my $mrd_end_time;
124: if ($MRD != 0) {
125: $mrd_end_time = time() + $MRD;
126: }
127: my $reply_msg;
128: do {
129: # create our socket, and send our Solicit
130: socket(SOCK, PF_INET6, SOCK_DGRAM, getprotobyname('udp')) || die;
131: my $addr = inet_pton(AF_INET6, $All_DHCP_Servers);
132: my $packet = $msg->packet();
133: my $send_ret = send(SOCK, $packet, 0,
134: pack_sockaddr_in6($server_port, $addr));
135: if (not defined($send_ret)) {
136: printf STDERR
137: "Error \%d sending DHCPv6 Solicit message;\n\%s\n",
138: 0+$ERRNO, $ERRNO;
139: exit(1);
140: } elsif ($send_ret != length($packet)) {
141: print STDERR "Unable to send entire DHCPv6 Solicit message.\n";
142: exit(1);
143: }
144: $count++;
145:
146: my $RAND = rand(0.2) - 0.1;
147: if (defined $RT) {
148: $RT = 2*$RT + $RAND*$RT;
149: if (($RT > $MRT) && ($MRT != 0)) {
150: $RT = $MRT + $RAND*$RT;
151: }
152: } else {
153: $RT = $IRT + $RAND*$IRT;
154: }
155:
156: my $rt_end_time = time() + $RT;
157: if (defined($mrd_end_time) && ($mrd_end_time > $rt_end_time)) {
158: $rt_end_time = $mrd_end_time;
159: }
160:
161: for (;;) {
162: my $timeout = $rt_end_time - time();
163: if ($timeout < 0) {
164: # print STDERR "Timeout waiting for DHCPv6 Advertise ",
165: # "or Reply message.\n";
166: last;
167: }
168:
169: my @ready = IO::Select->new(\*SOCK)->can_read($timeout);
170:
171: if (@ready) {
172: my $reply;
173: my $recv_ret;
174:
175: $recv_ret = recv(SOCK, $reply, 1500, 0);
176: if (not defined $recv_ret) {
177: printf STDERR
178: "Error \%d receiving DHCPv6 " .
179: "message;\n\%s\n",
180: 0+$ERRNO, $ERRNO;
181: exit(1);
182: }
183:
184: $reply_msg = dhcp_client::msg::decode($reply);
185: if (($reply_msg->{msg_type} == $MSG_ADVERTISE) ||
186: ($reply_msg->{msg_type} == $MSG_REPLY)) {
187: last;
188: }
189: }
190: }
191:
192: } until ($reply_msg ||
193: (($MRC != 0) && ($count > $MRC)) ||
194: (defined($mrd_end_time) && ($mrd_end_time > time())));
195:
196: unless ($reply_msg) {
197: if (($MRC != 0) && ($count >= $MRC)) {
198: print STDERR
199: "No reply after maximum retransmission count.\n";
200: } else {
201: print STDERR
202: "No reply after maximum retransmission duration.\n";
203: }
204: }
205:
206: if ($reply_msg && ($reply_msg->{msg_type} == $MSG_REPLY)) {
207: print "Got DHCPv6 Reply message.\n";
208: exit(0);
209: }
210:
211: #$Data::Dumper::Useqq = 1;
212: #print Dumper($msg), "\n";
213: #print Dumper($msg->packet()), "\n";
214: #
215: #print "packet length: ", length($msg->packet()), "\n";
216:
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