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 23use strict; 24use English; 25use Time::HiRes qw( sleep ); 26use Socket; 27use Socket6; 28use IO::Select; 29 30use dhcp_client; 31 32# XXX: for debugging 33use Data::Dumper; 34 35# not-yet-standard options 36my $OPT_TIME_SERVERS = 40; 37my $OPT_TIME_OFFSET = 41; 38 39# DOCSIS sub-options 40my $DOCSIS_OPT_ORO = 1; 41# 2 to 31 are reserved 42my $DOCSIS_OPT_TFTP_SERVERS = 32; 43my $DOCSIS_OPT_CONFIG_FILE_NAME = 33; 44my $DOCSIS_OPT_SYSLOG_SERVERS = 34; 45my $DOCSIS_OPT_TLV5 = 35; 46my $DOCSIS_OPT_DEVICE_ID = 36; 47my $DOCSIS_OPT_CCC = 37; 48my $DOCSIS_OPT_VERS = 38; 49 50# well-known addresses 51my $All_DHCP_Relay_Agents_and_Servers = "ff02::1:2"; 52my $All_DHCP_Servers = "ff05::1:3"; 53 54# ports 55my $client_port = 546; 56my $server_port = 547; 57 58# create a new Solicit message 59my $msg = dhcp_client::msg->new($MSG_DECLINE); 60 61# add the Client Identifier (required by DOCSIS and RFC 3315) 62my $client_id = "\x00\x01\x00\x01\x0c\x00\xa1\x41\x00\x06\x5b\x50\x99\xf6"; 63$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? 74my $iaid = 0; 75foreach 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 85my $IRT = $SOL_TIMEOUT; 86my $MRT = $SOL_MAX_RT; 87my $MRC = 4; # DOCSIS says 4, RFC 3315 says it SHOULD be 0 88my $MRD = 0; 89 90# sleep a random amount of time between 0 and 1 second, required by RFC 3315 91# XXX: this seems pretty stupid 92sleep(rand($SOL_MAX_DELAY)); 93 94my $RT; 95my $count = 0; 96my $mrd_end_time; 97if ($MRD != 0) { 98 $mrd_end_time = time() + $MRD; 99} 100my $reply_msg; 101do { 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) && ($mrd_end_time > time()))); 168 169unless ($reply_msg) { 170 if (($MRC != 0) && ($count >= $MRC)) { 171 print STDERR 172 "No reply after maximum retransmission count.\n"; 173 } else { 174 print STDERR 175 "No reply after maximum retransmission duration.\n"; 176 } 177} 178 179if ($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"; 189 190