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: $Data::Dumper::Useqq = 1;
35:
36: # not-yet-standard options
37: my $OPT_TIME_SERVERS = 40;
38: my $OPT_TIME_OFFSET = 41;
39:
40: # DOCSIS sub-options
41: my $DOCSIS_OPT_ORO = 1;
42: # 2 to 31 are reserved
43: my $DOCSIS_OPT_TFTP_SERVERS = 32;
44: my $DOCSIS_OPT_CONFIG_FILE_NAME = 33;
45: my $DOCSIS_OPT_SYSLOG_SERVERS = 34;
46: my $DOCSIS_OPT_TLV5 = 35;
47: my $DOCSIS_OPT_DEVICE_ID = 36;
48: my $DOCSIS_OPT_CCC = 37;
49: my $DOCSIS_OPT_VERS = 38;
50:
51: # well-known addresses
52: my $All_DHCP_Relay_Agents_and_Servers = "ff02::1:2";
53: my $All_DHCP_Servers = "ff05::1:3";
54:
55: # ports
56: my $client_port = 546;
57: my $server_port = 547;
58:
59: # create a new Solicit message
60: my $msg = dhcp_client::msg->new($MSG_SOLICIT);
61:
62: # add the Client Identifier (required by DOCSIS and RFC 3315)
63: my $client_id = "\x00\x01\x00\x01\x0c\x00\xa1\x41\x00\x06\x5b\x50\x99\xf6";
64: $msg->add_option($OPT_CLIENTID, $client_id);
65: #$msg->add_option($OPT_CLIENTID, 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: my $enc_opt = dhcp_client::msg->new(0);
76: $enc_opt->add_option($OPT_CLIENTID, $client_id);
77: $option_data .= $enc_opt->packed_options();
78: $msg->add_option($OPT_IA_NA, $option_data);
79: }
80:
81: # add Reconfigure Accept (required by DOCSIS)
82: $msg->add_option($OPT_RECONF_ACCEPT, "");
83:
84: # add Options Request (required by DOCSIS, recommended by RFC 3315)
85: my @oro = ( $OPT_TIME_SERVERS, $OPT_TIME_OFFSET );
86: $msg->add_option($OPT_ORO, pack("n*", @oro));
87:
88: # add Vendor Class option (required by DOCSIS)
89: $msg->add_option($OPT_VENDOR_CLASS, pack("N", 4491) . "docsis3.0");
90:
91: # add Vendor-specific Information Option option (required by DOCSIS)
92: my $vsio = pack("N", 4491);
93:
94: # ORO (required by DOCSIS)
95: my @docsis_oro = ( $DOCSIS_OPT_TFTP_SERVERS );
96: $vsio .= pack("nnC*", $DOCSIS_OPT_ORO, 0+@docsis_oro, @docsis_oro);
97:
98: # TLV5 data: CMTS DOCSIS version number 3.0 (required by DOCSIS)
99: my $tlv5_data = "\x01\x02\x03\x0";
100: $vsio .= pack("nn", $DOCSIS_OPT_TLV5, length($tlv5_data)) . $tlv5_data;
101:
102: # DOCSIS Device (required by DOCSIS)
103: my $docsis_device_id = dhcp_client::mac_addr_binary();
104: $vsio .= pack("nn", $DOCSIS_OPT_DEVICE_ID, length($docsis_device_id));
105: $vsio .= $docsis_device_id;
106:
107: $msg->add_option($OPT_VENDOR_OPTS, $vsio);
108:
109: # add Rapid Commit option (required by DOCSIS)
110: $msg->add_option($OPT_RAPID_COMMIT, "");
111:
112: # timeout parameters, from DOCSIS
113: my $IRT = $SOL_TIMEOUT;
114: my $MRT = $SOL_MAX_RT;
115: my $MRC = 4; # DOCSIS says 4, RFC 3315 says it SHOULD be 0
116: my $MRD = 0;
117:
118: # sleep a random amount of time between 0 and 1 second, required by RFC 3315
119: # XXX: this seems pretty stupid
120: sleep(rand($SOL_MAX_DELAY));
121:
122: my $RT;
123: my $count = 0;
124: my $mrd_end_time;
125: if ($MRD != 0) {
126: $mrd_end_time = time() + $MRD;
127: }
128: my $reply_msg;
129: do {
130: # create our socket, and send our Solicit
131: socket(SOCK, PF_INET6, SOCK_DGRAM, getprotobyname('udp')) || die;
132: my $addr = inet_pton(AF_INET6, $All_DHCP_Servers);
133: my $packet = $msg->packet();
134: my $send_ret = send(SOCK, $packet, 0,
135: pack_sockaddr_in6($server_port, $addr));
136: if (not defined($send_ret)) {
137: printf STDERR
138: "Error \%d sending DHCPv6 Solicit message;\n\%s\n",
139: 0+$ERRNO, $ERRNO;
140: exit(1);
141: } elsif ($send_ret != length($packet)) {
142: print STDERR "Unable to send entire DHCPv6 Solicit message.\n";
143: exit(1);
144: }
145: $count++;
146:
147: my $RAND = rand(0.2) - 0.1;
148: if (defined $RT) {
149: $RT = 2*$RT + $RAND*$RT;
150: if (($RT > $MRT) && ($MRT != 0)) {
151: $RT = $MRT + $RAND*$RT;
152: }
153: } else {
154: $RT = $IRT + $RAND*$IRT;
155: }
156:
157: my $rt_end_time = time() + $RT;
158: if (defined($mrd_end_time) && ($mrd_end_time > $rt_end_time)) {
159: $rt_end_time = $mrd_end_time;
160: }
161:
162: for (;;) {
163: my $timeout = $rt_end_time - time();
164: if ($timeout < 0) {
165: # print STDERR "Timeout waiting for DHCPv6 Advertise ",
166: # "or Reply message.\n";
167: last;
168: }
169:
170: my @ready = IO::Select->new(\*SOCK)->can_read($timeout);
171:
172: if (@ready) {
173: my $reply;
174: my $recv_ret;
175:
176: $recv_ret = recv(SOCK, $reply, 1500, 0);
177: if (not defined $recv_ret) {
178: printf STDERR
179: "Error \%d receiving DHCPv6 " .
180: "message;\n\%s\n",
181: 0+$ERRNO, $ERRNO;
182: exit(1);
183: }
184:
185: $reply_msg = dhcp_client::msg::decode($reply, 1);
186: if (($reply_msg->{msg_type} == $MSG_ADVERTISE) ||
187: ($reply_msg->{msg_type} == $MSG_REPLY)) {
188: last;
189: }
190: }
191: }
192:
193: } until ($reply_msg ||
194: (($MRC != 0) && ($count > $MRC)) ||
195: (defined($mrd_end_time) && ($mrd_end_time > time())));
196:
197: unless ($reply_msg) {
198: if (($MRC != 0) && ($count >= $MRC)) {
199: print STDERR
200: "No reply after maximum retransmission count.\n";
201: } else {
202: print STDERR
203: "No reply after maximum retransmission duration.\n";
204: }
205: }
206:
207: if ($reply_msg && ($reply_msg->{msg_type} == $MSG_REPLY)) {
208: print "Got DHCPv6 Reply message.\n";
209: #print Dumper($reply_msg), "\n";
210: exit(0);
211: }
212:
213: #print Dumper($msg), "\n";
214: #print Dumper($msg->packet()), "\n";
215: #
216: #print "packet length: ", length($msg->packet()), "\n";
217:
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