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dhcp 4.1 r7

    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: 
   23: use strict;
   24: use English;
   25: use Time::HiRes qw( sleep );
   26: use Socket;
   27: use Socket6;
   28: use IO::Select;
   29: 
   30: use dhcp_client;
   31: 
   32: # well-known addresses
   33: my $All_DHCP_Relay_Agents_and_Servers = "ff02::1:2";
   34: my $All_DHCP_Servers = "ff05::1:3";
   35: 
   36: # ports
   37: my $client_port = 546;
   38: my $server_port = 547;
   39: 
   40: # create a new Solicit message
   41: my $msg = dhcp_client::msg->new(255);
   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?
   51: my $iaid = 0;
   52: foreach 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)
   58: my @oro = ( );
   59: $msg->add_option($OPT_ORO, pack("n*", @oro));
   60: 
   61: # timeout parameters
   62: my $IRT = $SOL_TIMEOUT;
   63: my $MRT = $SOL_MAX_RT;
   64: my $MRC = 1;	# DOCSIS says 4, RFC 3315 says it SHOULD be 0
   65: my $MRD = 0;
   66: 
   67: # sleep a random amount of time between 0 and 1 second, required by RFC 3315
   68: # XXX: this seems pretty stupid
   69: sleep(rand($SOL_MAX_DELAY));
   70: 
   71: my $RT;
   72: my $count = 0;
   73: my $mrd_end_time;
   74: if ($MRD != 0) {
   75: 	$mrd_end_time = time() + $MRD;
   76: }
   77: my $reply_msg;
   78: do {
   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) && ($mrd_end_time > time())));
  143: 
  144: unless ($reply_msg) {
  145: 	if (($MRC != 0) && ($count >= $MRC)) {
  146: 		print STDERR 
  147: 			"No reply after maximum retransmission count.\n";
  148: 	} else {
  149: 		print STDERR 
  150: 			"No reply after maximum retransmission duration.\n";
  151: 	}
  152: }
  153: 
  154: if ($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: