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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 Solicit message
   59: my $msg = dhcp_client::msg->new($MSG_INFORMATION_REQUEST);
   60: 
   61: # add the Client Identifier (required by DOCSIS and RFC 3315)
   62: $msg->add_option($OPT_CLIENTID, dhcp_client::duid());
   63: 
   64: # add Elapsed Time, set to 0 on first packet (required by RFC 3315)
   65: $msg->add_option($OPT_ELAPSED_TIME, "\x00\x00");
   66: 
   67: # add IA_TA for each interface (should be IA_NA, by DOCSIS and RFC 3315)
   68: # XXX: should this be a single interface only?
   69: my $iaid = 0;
   70: foreach my $iface (dhcp_client::iface()) {
   71: 	my $option_data = pack("NNN", ++$iaid, 0, 0);
   72: 	$msg->add_option($OPT_IA_TA, $option_data);
   73: }
   74: 
   75: # add Reconfigure Accept (required by DOCSIS)
   76: $msg->add_option($OPT_RECONF_ACCEPT, "");
   77: 
   78: # add Options Request (required by DOCSIS, recommended by RFC 3315)
   79: my @oro = ( $OPT_TIME_SERVERS, $OPT_TIME_OFFSET );
   80: $msg->add_option($OPT_ORO, pack("n*", @oro));
   81: 
   82: 
   83: # add Vendor Class option (required by DOCSIS)
   84: $msg->add_option($OPT_VENDOR_CLASS, pack("N", 4491) . "docsis3.0");
   85: 
   86: # add Vendor-specific Information Option option (required by DOCSIS)
   87: my $vsio = pack("N", 4491);
   88: 
   89: # ORO (required by DOCSIS)
   90: my @docsis_oro = ( $DOCSIS_OPT_TFTP_SERVERS );
   91: $vsio .= pack("nnC*", $DOCSIS_OPT_ORO, 0+@docsis_oro, @docsis_oro);
   92: 
   93: # TLV5 data: CMTS DOCSIS version number 3.0 (required by DOCSIS)
   94: my $tlv5_data = "\x01\x02\x03\x0";  
   95: $vsio .= pack("nn", $DOCSIS_OPT_TLV5, length($tlv5_data)) . $tlv5_data;
   96: 
   97: # DOCSIS Device (required by DOCSIS)
   98: my $docsis_device_id = dhcp_client::mac_addr_binary();
   99: $vsio .= pack("nn", $DOCSIS_OPT_DEVICE_ID, length($docsis_device_id));
  100: $vsio .= $docsis_device_id;
  101: 
  102: $msg->add_option($OPT_VENDOR_OPTS, $vsio);
  103: 
  104: # add Rapid Commit option (required by DOCSIS)
  105: $msg->add_option($OPT_RAPID_COMMIT, "");
  106: 
  107: # timeout parameters, from DOCSIS
  108: my $IRT = $SOL_TIMEOUT;
  109: my $MRT = $SOL_MAX_RT;
  110: my $MRC = 1;	# DOCSIS says 4, RFC 3315 says it SHOULD be 0
  111: my $MRD = 0;
  112: 
  113: # sleep a random amount of time between 0 and 1 second, required by RFC 3315
  114: # XXX: this seems pretty stupid
  115: sleep(rand($SOL_MAX_DELAY));
  116: 
  117: my $RT;
  118: my $count = 0;
  119: my $mrd_end_time;
  120: if ($MRD != 0) {
  121: 	$mrd_end_time = time() + $MRD;
  122: }
  123: my $reply_msg;
  124: do {
  125: 	# create our socket, and send our Solicit
  126: 	socket(SOCK, PF_INET6, SOCK_DGRAM, getprotobyname('udp')) || die;
  127: 	my $addr = inet_pton(AF_INET6, $All_DHCP_Servers);
  128: 	my $packet = $msg->packet();
  129: 	my $send_ret = send(SOCK, $packet, 0, 
  130: 			    pack_sockaddr_in6($server_port, $addr));
  131: 	if (not defined($send_ret)) {
  132: 		printf STDERR 
  133: 			"Error \%d sending DHCPv6 Solicit message;\n\%s\n",
  134: 			0+$ERRNO, $ERRNO;
  135: 		exit(1);
  136: 	} elsif ($send_ret != length($packet)) {
  137: 		print STDERR "Unable to send entire DHCPv6 Solicit message.\n";
  138: 		exit(1);
  139: 	}
  140: 	$count++;
  141: 
  142: 	my $RAND = rand(0.2) - 0.1;
  143: 	if (defined $RT) {
  144: 		$RT = 2*$RT + $RAND*$RT;
  145: 		if (($RT > $MRT) && ($MRT != 0)) {
  146: 			$RT = $MRT + $RAND*$RT;
  147: 		}
  148: 	} else {
  149: 		$RT = $IRT + $RAND*$IRT;
  150: 	}
  151: 
  152: 	my $rt_end_time = time() + $RT;
  153: 	if (defined($mrd_end_time) && ($mrd_end_time > $rt_end_time)) { 
  154: 		$rt_end_time = $mrd_end_time;
  155: 	}
  156: 
  157: 	for (;;) {
  158: 		my $timeout = $rt_end_time - time();
  159: 		if ($timeout < 0) {
  160: #			print STDERR "Timeout waiting for DHCPv6 Advertise ",
  161: #				"or Reply message.\n";
  162: 			last;
  163: 		}
  164: 
  165: 		my @ready = IO::Select->new(\*SOCK)->can_read($timeout);
  166: 
  167: 		if (@ready) {
  168: 			my $reply;
  169: 			my $recv_ret;
  170: 	
  171: 			$recv_ret = recv(SOCK, $reply, 1500, 0);
  172: 			if (not defined $recv_ret) {
  173: 				printf STDERR 
  174: 					"Error \%d receiving DHCPv6 " . 
  175: 						"message;\n\%s\n",
  176: 					0+$ERRNO, $ERRNO;
  177: 				exit(1);
  178: 			}
  179: 
  180: 			$reply_msg = dhcp_client::msg::decode($reply);
  181: 			if (($reply_msg->{msg_type} == $MSG_ADVERTISE) ||
  182: 			    ($reply_msg->{msg_type} == $MSG_REPLY)) {
  183: 			    	last;
  184: 			}
  185: 		}
  186: 	}
  187: 
  188: } until ($reply_msg || 
  189: 	 (($MRC != 0) && ($count > $MRC)) ||
  190: 	 (defined($mrd_end_time) && ($mrd_end_time > time())));
  191: 
  192: unless ($reply_msg) {
  193: 	if (($MRC != 0) && ($count >= $MRC)) {
  194: 		print STDERR 
  195: 			"No reply after maximum retransmission count.\n";
  196: 	} else {
  197: 		print STDERR 
  198: 			"No reply after maximum retransmission duration.\n";
  199: 	}
  200: }
  201: 
  202: if ($reply_msg && ($reply_msg->{msg_type} == $MSG_REPLY)) {
  203: 	print "Got DHCPv6 Reply message.\n";
  204: 	exit(0);
  205: }
  206: 
  207: #$Data::Dumper::Useqq = 1;
  208: #print Dumper($msg), "\n";
  209: #print Dumper($msg->packet()), "\n";
  210: #
  211: #print "packet length: ", length($msg->packet()), "\n";
  212: