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$Data::Dumper::Useqq = 1; 35 36# not-yet-standard options 37my $OPT_TIME_SERVERS = 40; 38my $OPT_TIME_OFFSET = 41; 39 40# DOCSIS sub-options 41my $DOCSIS_OPT_ORO = 1; 42# 2 to 31 are reserved 43my $DOCSIS_OPT_TFTP_SERVERS = 32; 44my $DOCSIS_OPT_CONFIG_FILE_NAME = 33; 45my $DOCSIS_OPT_SYSLOG_SERVERS = 34; 46my $DOCSIS_OPT_TLV5 = 35; 47my $DOCSIS_OPT_DEVICE_ID = 36; 48my $DOCSIS_OPT_CCC = 37; 49my $DOCSIS_OPT_VERS = 38; 50 51# well-known addresses 52my $All_DHCP_Relay_Agents_and_Servers = "ff02::1:2"; 53my $All_DHCP_Servers = "ff05::1:3"; 54 55# ports 56my $client_port = 546; 57my $server_port = 547; 58 59# create a new Solicit message 60my $msg = dhcp_client::msg->new($MSG_SOLICIT); 61 62# add the Client Identifier (required by DOCSIS and RFC 3315) 63my $client_id = "\x00\x01\x00\x01\x0c\x00\xa1\x41\x00\x06\x5b\x50\x99\xf6"; 64$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? 72my $iaid = 0; 73foreach 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) 85my @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) 92my $vsio = pack("N", 4491); 93 94# ORO (required by DOCSIS) 95my @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) 99my $tlv5_data = "\x01\x02\x03\x0"; 100$vsio .= pack("nn", $DOCSIS_OPT_TLV5, length($tlv5_data)) . $tlv5_data; 101 102# DOCSIS Device (required by DOCSIS) 103my $docsis_device_id = dhcp_client::mac_addr_binary(); 104$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 113my $IRT = $SOL_TIMEOUT; 114my $MRT = $SOL_MAX_RT; 115my $MRC = 4; # DOCSIS says 4, RFC 3315 says it SHOULD be 0 116my $MRD = 0; 117 118# sleep a random amount of time between 0 and 1 second, required by RFC 3315 119# XXX: this seems pretty stupid 120sleep(rand($SOL_MAX_DELAY)); 121 122my $RT; 123my $count = 0; 124my $mrd_end_time; 125if ($MRD != 0) { 126 $mrd_end_time = time() + $MRD; 127} 128my $reply_msg; 129do { 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) && ($mrd_end_time > time()))); 196 197unless ($reply_msg) { 198 if (($MRC != 0) && ($count >= $MRC)) { 199 print STDERR 200 "No reply after maximum retransmission count.\n"; 201 } else { 202 print STDERR 203 "No reply after maximum retransmission duration.\n"; 204 } 205} 206 207if ($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"; 217 218