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#! /usr/bin/perl -w
# Copyright (C) 2007-2022 Internet Systems Consortium, Inc. ("ISC")
#
# Permission to use, copy, modify, and distribute this software for any
# purpose with or without fee is hereby granted, provided that the above
# copyright notice and this permission notice appear in all copies.
#
# THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES
# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR
# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
# WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
# ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
# OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
#
# Internet Systems Consortium, Inc.
# PO Box 360
# Newmarket, NH 03857 USA
# <info@isc.org>
# https://www.isc.org/
use strict;
use English;
use Time::HiRes qw( sleep );
use Socket;
use Socket6;
use IO::Select;
use dhcp_client;
# XXX: for debugging
use Data::Dumper;
# not-yet-standard options
my $OPT_TIME_SERVERS = 40;
my $OPT_TIME_OFFSET = 41;
# DOCSIS sub-options
my $DOCSIS_OPT_ORO = 1;
# 2 to 31 are reserved
my $DOCSIS_OPT_TFTP_SERVERS = 32;
my $DOCSIS_OPT_CONFIG_FILE_NAME = 33;
my $DOCSIS_OPT_SYSLOG_SERVERS = 34;
my $DOCSIS_OPT_TLV5 = 35;
my $DOCSIS_OPT_DEVICE_ID = 36;
my $DOCSIS_OPT_CCC = 37;
my $DOCSIS_OPT_VERS = 38;
# well-known addresses
my $All_DHCP_Relay_Agents_and_Servers = "ff02::1:2";
my $All_DHCP_Servers = "ff05::1:3";
# ports
my $client_port = 546;
my $server_port = 547;
# create a new Solicit message
my $msg = dhcp_client::msg->new($MSG_RELEASE);
# add the Client Identifier (required by DOCSIS and RFC 3315)
$msg->add_option($OPT_CLIENTID, dhcp_client::duid());
# add the Server identifier (required by RFC 3315)
$msg->add_option($OPT_SERVERID, "InfiniteEntropy");
# add Elapsed Time, set to 0 on first packet (required by RFC 3315)
$msg->add_option($OPT_ELAPSED_TIME, "\x00\x00");
# add IA_NA for each interface (required by DOCSIS and RFC 3315)
# XXX: should this be a single interface only?
my $iaid = 0;
foreach my $iface (dhcp_client::iface()) {
my $iaaddr_option = inet_pton(AF_INET6, "1:2:3:4::");
$iaaddr_option .= pack("NN", 0, 0);
my $option_data = pack("NNN", ++$iaid, 0, 0);
$option_data .= pack("nn", $OPT_IAADDR, length($iaaddr_option)-8);
$option_data .= $iaaddr_option;
$msg->add_option($OPT_IA_NA, $option_data);
}
# timeout parameters, from DOCSIS
my $IRT = $SOL_TIMEOUT;
my $MRT = $SOL_MAX_RT;
my $MRC = 4; # DOCSIS says 4, RFC 3315 says it SHOULD be 0
my $MRD = 0;
# sleep a random amount of time between 0 and 1 second, required by RFC 3315
# XXX: this seems pretty stupid
sleep(rand($SOL_MAX_DELAY));
my $RT;
my $count = 0;
my $mrd_end_time;
if ($MRD != 0) {
$mrd_end_time = time() + $MRD;
}
my $reply_msg;
do {
# create our socket, and send our Solicit
socket(SOCK, PF_INET6, SOCK_DGRAM, getprotobyname('udp')) || die;
my $addr = inet_pton(AF_INET6, $All_DHCP_Servers);
my $packet = $msg->packet();
my $send_ret = send(SOCK, $packet, 0,
pack_sockaddr_in6($server_port, $addr));
if (not defined($send_ret)) {
printf STDERR
"Error \%d sending DHCPv6 Solicit message;\n\%s\n",
0+$ERRNO, $ERRNO;
exit(1);
} elsif ($send_ret != length($packet)) {
print STDERR "Unable to send entire DHCPv6 Solicit message.\n";
exit(1);
}
$count++;
my $RAND = rand(0.2) - 0.1;
if (defined $RT) {
$RT = 2*$RT + $RAND*$RT;
if (($RT > $MRT) && ($MRT != 0)) {
$RT = $MRT + $RAND*$RT;
}
} else {
$RT = $IRT + $RAND*$IRT;
}
my $rt_end_time = time() + $RT;
if (defined($mrd_end_time) && ($mrd_end_time > $rt_end_time)) {
$rt_end_time = $mrd_end_time;
}
for (;;) {
my $timeout = $rt_end_time - time();
if ($timeout < 0) {
# print STDERR "Timeout waiting for DHCPv6 Advertise ",
# "or Reply message.\n";
last;
}
my @ready = IO::Select->new(\*SOCK)->can_read($timeout);
if (@ready) {
my $reply;
my $recv_ret;
$recv_ret = recv(SOCK, $reply, 1500, 0);
if (not defined $recv_ret) {
printf STDERR
"Error \%d receiving DHCPv6 " .
"message;\n\%s\n",
0+$ERRNO, $ERRNO;
exit(1);
}
$reply_msg = dhcp_client::msg::decode($reply, 1);
if (($reply_msg->{msg_type} == $MSG_ADVERTISE) ||
($reply_msg->{msg_type} == $MSG_REPLY)) {
last;
}
}
}
} until ($reply_msg ||
(($MRC != 0) && ($count > $MRC)) ||
(defined($mrd_end_time) && ($mrd_end_time > time())));
unless ($reply_msg) {
if (($MRC != 0) && ($count >= $MRC)) {
print STDERR
"No reply after maximum retransmission count.\n";
} else {
print STDERR
"No reply after maximum retransmission duration.\n";
}
}
if ($reply_msg && ($reply_msg->{msg_type} == $MSG_REPLY)) {
print "Got DHCPv6 Reply message.\n";
exit(0);
}
#$Data::Dumper::Useqq = 1;
#print Dumper($msg), "\n";
#print Dumper($msg->packet()), "\n";
#
#print "packet length: ", length($msg->packet()), "\n";
|
