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# Copyright (c) 2007 by Internet Systems Consortium, Inc. ("ISC")
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# Permission to use, copy, modify, and distribute this software for any
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# purpose with or without fee is hereby granted, provided that the above
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# copyright notice and this permission notice appear in all copies.
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# THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES
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# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR
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# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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# WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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# ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
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# OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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# Internet Systems Consortium, Inc.
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# Redwood City, CA 94063
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use Time::HiRes qw( sleep );
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# not-yet-standard options
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my $OPT_TIME_SERVERS = 40;
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my $OPT_TIME_OFFSET = 41;
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my $DOCSIS_OPT_ORO = 1;
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# 2 to 31 are reserved
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my $DOCSIS_OPT_TFTP_SERVERS = 32;
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my $DOCSIS_OPT_CONFIG_FILE_NAME = 33;
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my $DOCSIS_OPT_SYSLOG_SERVERS = 34;
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my $DOCSIS_OPT_TLV5 = 35;
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my $DOCSIS_OPT_DEVICE_ID = 36;
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my $DOCSIS_OPT_CCC = 37;
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my $DOCSIS_OPT_VERS = 38;
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# well-known addresses
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my $All_DHCP_Relay_Agents_and_Servers = "ff02::1:2";
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my $All_DHCP_Servers = "ff05::1:3";
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my $client_port = 546;
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my $server_port = 547;
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# create a new Solicit message
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my $msg = dhcp_client::msg->new($MSG_INFORMATION_REQUEST);
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# add the Client Identifier (required by DOCSIS and RFC 3315)
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$msg->add_option($OPT_CLIENTID, dhcp_client::duid());
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# add Elapsed Time, set to 0 on first packet (required by RFC 3315)
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$msg->add_option($OPT_ELAPSED_TIME, "\x00\x00");
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# add IA_NA for each interface (required by DOCSIS and RFC 3315)
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# XXX: should this be a single interface only?
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foreach my $iface (dhcp_client::iface()) {
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my $option_data = pack("NNN", ++$iaid, 0, 0);
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$msg->add_option($OPT_IA_NA, $option_data);
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# add Reconfigure Accept (required by DOCSIS)
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$msg->add_option($OPT_RECONF_ACCEPT, "");
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# add Options Request (required by DOCSIS, recommended by RFC 3315)
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my @oro = ( $OPT_TIME_SERVERS, $OPT_TIME_OFFSET );
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$msg->add_option($OPT_ORO, pack("n*", @oro));
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# add Vendor Class option (required by DOCSIS)
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$msg->add_option($OPT_VENDOR_CLASS, pack("N", 4491) . "docsis3.0");
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# add Vendor-specific Information Option option (required by DOCSIS)
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my $vsio = pack("N", 4491);
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# ORO (required by DOCSIS)
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my @docsis_oro = ( $DOCSIS_OPT_TFTP_SERVERS );
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$vsio .= pack("nnC*", $DOCSIS_OPT_ORO, 0+@docsis_oro, @docsis_oro);
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# TLV5 data: CMTS DOCSIS version number 3.0 (required by DOCSIS)
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my $tlv5_data = "\x01\x02\x03\x0";
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$vsio .= pack("nn", $DOCSIS_OPT_TLV5, length($tlv5_data)) . $tlv5_data;
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# DOCSIS Device (required by DOCSIS)
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my $docsis_device_id = dhcp_client::mac_addr_binary();
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$vsio .= pack("nn", $DOCSIS_OPT_DEVICE_ID, length($docsis_device_id));
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$vsio .= $docsis_device_id;
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$msg->add_option($OPT_VENDOR_OPTS, $vsio);
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# add Rapid Commit option (required by DOCSIS)
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$msg->add_option($OPT_RAPID_COMMIT, "");
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# timeout parameters, from DOCSIS
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my $IRT = $SOL_TIMEOUT;
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my $MRT = $SOL_MAX_RT;
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my $MRC = 1; # DOCSIS says 4, RFC 3315 says it SHOULD be 0
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# sleep a random amount of time between 0 and 1 second, required by RFC 3315
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# XXX: this seems pretty stupid
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sleep(rand($SOL_MAX_DELAY));
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$mrd_end_time = time() + $MRD;
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# create our socket, and send our Solicit
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socket(SOCK, PF_INET6, SOCK_DGRAM, getprotobyname('udp')) || die;
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my $addr = inet_pton(AF_INET6, $All_DHCP_Servers);
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my $packet = $msg->packet();
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my $send_ret = send(SOCK, $packet, 0,
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pack_sockaddr_in6($server_port, $addr));
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if (not defined($send_ret)) {
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"Error \%d sending DHCPv6 Solicit message;\n\%s\n",
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} elsif ($send_ret != length($packet)) {
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print STDERR "Unable to send entire DHCPv6 Solicit message.\n";
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my $RAND = rand(0.2) - 0.1;
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$RT = 2*$RT + $RAND*$RT;
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if (($RT > $MRT) && ($MRT != 0)) {
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$RT = $MRT + $RAND*$RT;
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$RT = $IRT + $RAND*$IRT;
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my $rt_end_time = time() + $RT;
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if (defined($mrd_end_time) && ($mrd_end_time > $rt_end_time)) {
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$rt_end_time = $mrd_end_time;
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my $timeout = $rt_end_time - time();
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# print STDERR "Timeout waiting for DHCPv6 Advertise ",
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# "or Reply message.\n";
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my @ready = IO::Select->new(\*SOCK)->can_read($timeout);
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$recv_ret = recv(SOCK, $reply, 1500, 0);
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if (not defined $recv_ret) {
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"Error \%d receiving DHCPv6 " .
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$reply_msg = dhcp_client::msg::decode($reply);
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if (($reply_msg->{msg_type} == $MSG_ADVERTISE) ||
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($reply_msg->{msg_type} == $MSG_REPLY)) {
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} until ($reply_msg ||
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(($MRC != 0) && ($count > $MRC)) ||
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(defined($mrd_end_time) && ($mrd_end_time > time())));
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unless ($reply_msg) {
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if (($MRC != 0) && ($count >= $MRC)) {
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"No reply after maximum retransmission count.\n";
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"No reply after maximum retransmission duration.\n";
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if ($reply_msg && ($reply_msg->{msg_type} == $MSG_REPLY)) {
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print "Got DHCPv6 Reply message.\n";
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#$Data::Dumper::Useqq = 1;
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#print Dumper($msg), "\n";
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#print Dumper($msg->packet()), "\n";
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#print "packet length: ", length($msg->packet()), "\n";