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