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# well-known addresses 33my $All_DHCP_Relay_Agents_and_Servers = "ff02::1:2"; 34my $All_DHCP_Servers = "ff05::1:3"; 35 36# ports 37my $client_port = 546; 38my $server_port = 547; 39 40# create a new Solicit message 41my $msg = dhcp_client::msg->new($MSG_ADVERTISE); 42 43# add the Client Identifier (required by DOCSIS and RFC 3315) 44$msg->add_option($OPT_CLIENTID, dhcp_client::duid()); 45 46# add Elapsed Time, set to 0 on first packet (required by RFC 3315) 47$msg->add_option($OPT_ELAPSED_TIME, "\x00\x00"); 48 49# add IA_NA for each interface (required by DOCSIS and RFC 3315) 50# XXX: should this be a single interface only? 51my $iaid = 0; 52foreach my $iface (dhcp_client::iface()) { 53 my $option_data = pack("NNN", ++$iaid, 0, 0); 54 $msg->add_option($OPT_IA_NA, $option_data); 55} 56 57# add Options Request (required by DOCSIS, recommended by RFC 3315) 58my @oro = ( ); 59$msg->add_option($OPT_ORO, pack("n*", @oro)); 60 61# timeout parameters 62my $IRT = $SOL_TIMEOUT; 63my $MRT = $SOL_MAX_RT; 64my $MRC = 1; # DOCSIS says 4, RFC 3315 says it SHOULD be 0 65my $MRD = 0; 66 67# sleep a random amount of time between 0 and 1 second, required by RFC 3315 68# XXX: this seems pretty stupid 69sleep(rand($SOL_MAX_DELAY)); 70 71my $RT; 72my $count = 0; 73my $mrd_end_time; 74if ($MRD != 0) { 75 $mrd_end_time = time() + $MRD; 76} 77my $reply_msg; 78do { 79 # create our socket, and send our bogus packet 80 socket(SOCK, PF_INET6, SOCK_DGRAM, getprotobyname('udp')) || die; 81 my $addr = inet_pton(AF_INET6, $All_DHCP_Servers); 82 my $packet = $msg->packet(); 83 my $send_ret = send(SOCK, $packet, 0, 84 pack_sockaddr_in6($server_port, $addr)); 85 if (not defined($send_ret)) { 86 printf STDERR 87 "Error \%d sending DHCPv6 message;\n\%s\n", 88 0+$ERRNO, $ERRNO; 89 exit(1); 90 } elsif ($send_ret != length($packet)) { 91 print STDERR "Unable to send entire DHCPv6 message.\n"; 92 exit(1); 93 } 94 $count++; 95 96 my $RAND = rand(0.2) - 0.1; 97 if (defined $RT) { 98 $RT = 2*$RT + $RAND*$RT; 99 if (($RT > $MRT) && ($MRT != 0)) { 100 $RT = $MRT + $RAND*$RT; 101 } 102 } else { 103 $RT = $IRT + $RAND*$IRT; 104 } 105 106 my $rt_end_time = time() + $RT; 107 if (defined($mrd_end_time) && ($mrd_end_time > $rt_end_time)) { 108 $rt_end_time = $mrd_end_time; 109 } 110 111 for (;;) { 112 my $timeout = $rt_end_time - time(); 113 if ($timeout < 0) { 114 last; 115 } 116 117 my @ready = IO::Select->new(\*SOCK)->can_read($timeout); 118 119 if (@ready) { 120 my $reply; 121 my $recv_ret; 122 123 $recv_ret = recv(SOCK, $reply, 1500, 0); 124 if (not defined $recv_ret) { 125 printf STDERR 126 "Error \%d receiving DHCPv6 " . 127 "message;\n\%s\n", 128 0+$ERRNO, $ERRNO; 129 exit(1); 130 } 131 132 $reply_msg = dhcp_client::msg::decode($reply); 133 if (($reply_msg->{msg_type} == $MSG_ADVERTISE) || 134 ($reply_msg->{msg_type} == $MSG_REPLY)) { 135 last; 136 } 137 } 138 } 139 140} until ($reply_msg || 141 (($MRC != 0) && ($count > $MRC)) || 142 (defined($mrd_end_time) && ($mrd_end_time > time()))); 143 144unless ($reply_msg) { 145 if (($MRC != 0) && ($count >= $MRC)) { 146 print STDERR 147 "No reply after maximum retransmission count.\n"; 148 } else { 149 print STDERR 150 "No reply after maximum retransmission duration.\n"; 151 } 152} 153 154if ($reply_msg && ($reply_msg->{msg_type} == $MSG_REPLY)) { 155 print "Got DHCPv6 Reply message.\n"; 156 exit(0); 157} 158 159#$Data::Dumper::Useqq = 1; 160#print Dumper($msg), "\n"; 161#print Dumper($msg->packet()), "\n"; 162# 163#print "packet length: ", length($msg->packet()), "\n"; 164 165