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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: # XXX: for debugging
   33: use Data::Dumper;
   34: 
   35: # not-yet-standard options
   36: my $OPT_TIME_SERVERS = 40;
   37: my $OPT_TIME_OFFSET = 41;
   38: 
   39: # DOCSIS sub-options
   40: my $DOCSIS_OPT_ORO = 1;
   41: # 2 to 31 are reserved
   42: my $DOCSIS_OPT_TFTP_SERVERS = 32;
   43: my $DOCSIS_OPT_CONFIG_FILE_NAME = 33;
   44: my $DOCSIS_OPT_SYSLOG_SERVERS = 34;
   45: my $DOCSIS_OPT_TLV5 = 35;
   46: my $DOCSIS_OPT_DEVICE_ID = 36;
   47: my $DOCSIS_OPT_CCC = 37;
   48: my $DOCSIS_OPT_VERS = 38;
   49: 
   50: # well-known addresses
   51: my $All_DHCP_Relay_Agents_and_Servers = "ff02::1:2";
   52: my $All_DHCP_Servers = "ff05::1:3";
   53: 
   54: # ports
   55: my $client_port = 546;
   56: my $server_port = 547;
   57: 
   58: # create a new message
   59: my $msg = dhcp_client::msg->new($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
   71: my $IRT = $SOL_TIMEOUT;
   72: my $MRT = $SOL_MAX_RT;
   73: my $MRC = 4;	# DOCSIS says 4, RFC 3315 says it SHOULD be 0
   74: my $MRD = 0;
   75: 
   76: # sleep a random amount of time between 0 and 1 second, required by RFC 3315
   77: # XXX: this seems pretty stupid
   78: sleep(rand($SOL_MAX_DELAY));
   79: 
   80: my $RT;
   81: my $count = 0;
   82: my $mrd_end_time;
   83: if ($MRD != 0) {
   84: 	$mrd_end_time = time() + $MRD;
   85: }
   86: my $reply_msg;
   87: do {
   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) && ($mrd_end_time > time())));
  154: 
  155: unless ($reply_msg) {
  156: 	if (($MRC != 0) && ($count >= $MRC)) {
  157: 		print STDERR 
  158: 			"No reply after maximum retransmission count.\n";
  159: 	} else {
  160: 		print STDERR 
  161: 			"No reply after maximum retransmission duration.\n";
  162: 	}
  163: }
  164: 
  165: if ($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: