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 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# timeout parameters, from DOCSIS 71my $IRT = $SOL_TIMEOUT; 72my $MRT = $SOL_MAX_RT; 73my $MRC = 4; # DOCSIS says 4, RFC 3315 says it SHOULD be 0 74my $MRD = 0; 75 76# sleep a random amount of time between 0 and 1 second, required by RFC 3315 77# XXX: this seems pretty stupid 78sleep(rand($SOL_MAX_DELAY)); 79 80my $RT; 81my $count = 0; 82my $mrd_end_time; 83if ($MRD != 0) { 84 $mrd_end_time = time() + $MRD; 85} 86my $reply_msg; 87do { 88 # create our socket, and send our message 89 socket(SOCK, PF_INET6, SOCK_DGRAM, getprotobyname('udp')) || die; 90 my $addr = inet_pton(AF_INET6, $All_DHCP_Servers); 91 my $packet = $msg->packet(); 92 my $send_ret = send(SOCK, $packet, 0, 93 pack_sockaddr_in6($server_port, $addr)); 94 if (not defined($send_ret)) { 95 printf STDERR 96 "Error \%d sending DHCPv6 message;\n\%s\n", 97 0+$ERRNO, $ERRNO; 98 exit(1); 99 } elsif ($send_ret != length($packet)) { 100 print STDERR "Unable to send entire DHCPv6 message.\n"; 101 exit(1); 102 } 103 $count++; 104 105 my $RAND = rand(0.2) - 0.1; 106 if (defined $RT) { 107 $RT = 2*$RT + $RAND*$RT; 108 if (($RT > $MRT) && ($MRT != 0)) { 109 $RT = $MRT + $RAND*$RT; 110 } 111 } else { 112 $RT = $IRT + $RAND*$IRT; 113 } 114 115 my $rt_end_time = time() + $RT; 116 if (defined($mrd_end_time) && ($mrd_end_time > $rt_end_time)) { 117 $rt_end_time = $mrd_end_time; 118 } 119 120 for (;;) { 121 my $timeout = $rt_end_time - time(); 122 if ($timeout < 0) { 123# print STDERR "Timeout waiting for DHCPv6 Advertise ", 124# "or Reply message.\n"; 125 last; 126 } 127 128 my @ready = IO::Select->new(\*SOCK)->can_read($timeout); 129 130 if (@ready) { 131 my $reply; 132 my $recv_ret; 133 134 $recv_ret = recv(SOCK, $reply, 1500, 0); 135 if (not defined $recv_ret) { 136 printf STDERR 137 "Error \%d receiving DHCPv6 " . 138 "message;\n\%s\n", 139 0+$ERRNO, $ERRNO; 140 exit(1); 141 } 142 143 $reply_msg = dhcp_client::msg::decode($reply, 1); 144 if (($reply_msg->{msg_type} == $MSG_ADVERTISE) || 145 ($reply_msg->{msg_type} == $MSG_REPLY)) { 146 last; 147 } 148 } 149 } 150 151} until ($reply_msg || 152 (($MRC != 0) && ($count > $MRC)) || 153 (defined($mrd_end_time) && ($mrd_end_time > time()))); 154 155unless ($reply_msg) { 156 if (($MRC != 0) && ($count >= $MRC)) { 157 print STDERR 158 "No reply after maximum retransmission count.\n"; 159 } else { 160 print STDERR 161 "No reply after maximum retransmission duration.\n"; 162 } 163} 164 165if ($reply_msg && ($reply_msg->{msg_type} == $MSG_REPLY)) { 166 print "Got DHCPv6 Reply message.\n"; 167 exit(0); 168} 169 170#$Data::Dumper::Useqq = 1; 171#print Dumper($msg), "\n"; 172#print Dumper($msg->packet()), "\n"; 173# 174#print "packet length: ", length($msg->packet()), "\n"; 175 176