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_RELEASE);
60:
61: # add the Client Identifier (required by DOCSIS and RFC 3315)
62: my $client_id = "\x00\x01\x00\x01\x0c\x00\xa1\x41\x00\x06\x5b\x50\x99\xf6";
63: $msg->add_option($OPT_CLIENTID, $client_id);
64: #$msg->add_option($OPT_CLIENTID, dhcp_client::duid(3));
65:
66: # add the Server identifier (required by RFC 3315)
67: $msg->add_option($OPT_SERVERID, "InfiniteEntropy");
68:
69: # add Elapsed Time, set to 0 on first packet (required by RFC 3315)
70: $msg->add_option($OPT_ELAPSED_TIME, "\x00\x00");
71:
72: # add IA_NA for each interface (required by DOCSIS and RFC 3315)
73: # XXX: should this be a single interface only?
74: my $iaid = 0;
75: foreach my $iface (dhcp_client::iface()) {
76: my $iaaddr_option = inet_pton(AF_INET6, "3ffe:aaaa:aaaa:aaaa::ffff");
77: $iaaddr_option .= pack("NN", 0, 0);
78: my $option_data = pack("NNN", ++$iaid, 0, 0);
79: $option_data .= pack("nn", $OPT_IAADDR, length($iaaddr_option)-8);
80: $option_data .= $iaaddr_option;
81: $msg->add_option($OPT_IA_NA, $option_data);
82: }
83:
84: # timeout parameters, from DOCSIS
85: my $IRT = $SOL_TIMEOUT;
86: my $MRT = $SOL_MAX_RT;
87: my $MRC = 4; # DOCSIS says 4, RFC 3315 says it SHOULD be 0
88: my $MRD = 0;
89:
90: # sleep a random amount of time between 0 and 1 second, required by RFC 3315
91: # XXX: this seems pretty stupid
92: sleep(rand($SOL_MAX_DELAY));
93:
94: my $RT;
95: my $count = 0;
96: my $mrd_end_time;
97: if ($MRD != 0) {
98: $mrd_end_time = time() + $MRD;
99: }
100: my $reply_msg;
101: do {
102: # create our socket, and send our Solicit
103: socket(SOCK, PF_INET6, SOCK_DGRAM, getprotobyname('udp')) || die;
104: my $addr = inet_pton(AF_INET6, $All_DHCP_Servers);
105: my $packet = $msg->packet();
106: my $send_ret = send(SOCK, $packet, 0,
107: pack_sockaddr_in6($server_port, $addr));
108: if (not defined($send_ret)) {
109: printf STDERR
110: "Error \%d sending DHCPv6 Solicit message;\n\%s\n",
111: 0+$ERRNO, $ERRNO;
112: exit(1);
113: } elsif ($send_ret != length($packet)) {
114: print STDERR "Unable to send entire DHCPv6 Solicit message.\n";
115: exit(1);
116: }
117: $count++;
118:
119: my $RAND = rand(0.2) - 0.1;
120: if (defined $RT) {
121: $RT = 2*$RT + $RAND*$RT;
122: if (($RT > $MRT) && ($MRT != 0)) {
123: $RT = $MRT + $RAND*$RT;
124: }
125: } else {
126: $RT = $IRT + $RAND*$IRT;
127: }
128:
129: my $rt_end_time = time() + $RT;
130: if (defined($mrd_end_time) && ($mrd_end_time > $rt_end_time)) {
131: $rt_end_time = $mrd_end_time;
132: }
133:
134: for (;;) {
135: my $timeout = $rt_end_time - time();
136: if ($timeout < 0) {
137: # print STDERR "Timeout waiting for DHCPv6 Advertise ",
138: # "or Reply message.\n";
139: last;
140: }
141:
142: my @ready = IO::Select->new(\*SOCK)->can_read($timeout);
143:
144: if (@ready) {
145: my $reply;
146: my $recv_ret;
147:
148: $recv_ret = recv(SOCK, $reply, 1500, 0);
149: if (not defined $recv_ret) {
150: printf STDERR
151: "Error \%d receiving DHCPv6 " .
152: "message;\n\%s\n",
153: 0+$ERRNO, $ERRNO;
154: exit(1);
155: }
156:
157: $reply_msg = dhcp_client::msg::decode($reply, 1);
158: if (($reply_msg->{msg_type} == $MSG_ADVERTISE) ||
159: ($reply_msg->{msg_type} == $MSG_REPLY)) {
160: last;
161: }
162: }
163: }
164:
165: } until ($reply_msg ||
166: (($MRC != 0) && ($count > $MRC)) ||
167: (defined($mrd_end_time) && ($mrd_end_time > time())));
168:
169: unless ($reply_msg) {
170: if (($MRC != 0) && ($count >= $MRC)) {
171: print STDERR
172: "No reply after maximum retransmission count.\n";
173: } else {
174: print STDERR
175: "No reply after maximum retransmission duration.\n";
176: }
177: }
178:
179: if ($reply_msg && ($reply_msg->{msg_type} == $MSG_REPLY)) {
180: print "Got DHCPv6 Reply message.\n";
181: exit(0);
182: }
183:
184: #$Data::Dumper::Useqq = 1;
185: #print Dumper($msg), "\n";
186: #print Dumper($msg->packet()), "\n";
187: #
188: #print "packet length: ", length($msg->packet()), "\n";
189:
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