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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: $Data::Dumper::Useqq = 1;
   35: 
   36: # not-yet-standard options
   37: my $OPT_TIME_SERVERS = 40;
   38: my $OPT_TIME_OFFSET = 41;
   39: 
   40: # DOCSIS sub-options
   41: my $DOCSIS_OPT_ORO = 1;
   42: # 2 to 31 are reserved
   43: my $DOCSIS_OPT_TFTP_SERVERS = 32;
   44: my $DOCSIS_OPT_CONFIG_FILE_NAME = 33;
   45: my $DOCSIS_OPT_SYSLOG_SERVERS = 34;
   46: my $DOCSIS_OPT_TLV5 = 35;
   47: my $DOCSIS_OPT_DEVICE_ID = 36;
   48: my $DOCSIS_OPT_CCC = 37;
   49: my $DOCSIS_OPT_VERS = 38;
   50: 
   51: # well-known addresses
   52: my $All_DHCP_Relay_Agents_and_Servers = "ff02::1:2";
   53: my $All_DHCP_Servers = "ff05::1:3";
   54: 
   55: # ports
   56: my $client_port = 546;
   57: my $server_port = 547;
   58: 
   59: # create a new Solicit message
   60: my $msg = dhcp_client::msg->new($MSG_SOLICIT);
   61: 
   62: # add the Client Identifier (required by DOCSIS and RFC 3315)
   63: my $client_id = "\x00\x01\x00\x01\x0c\x00\xa1\x41\x00\x06\x5b\x50\x99\xf6";
   64: #my $client_id = dhcp_client::duid(3);
   65: $msg->add_option($OPT_CLIENTID, $client_id);
   66: #$msg->add_option($OPT_CLIENTID, dhcp_client::duid(3));
   67: 
   68: # add Elapsed Time, set to 0 on first packet (required by RFC 3315)
   69: $msg->add_option($OPT_ELAPSED_TIME, "\x00\x00");
   70: 
   71: # add IA_NA for each interface (required by DOCSIS and RFC 3315)
   72: # XXX: should this be a single interface only?
   73: my $iaid = 0;
   74: foreach my $iface (dhcp_client::iface()) {
   75: 	my $option_data = pack("NNN", ++$iaid, 0, 0);
   76: 	my $enc_opt = dhcp_client::msg->new(0);
   77: 	$enc_opt->add_option($OPT_CLIENTID, $client_id);
   78: 	$option_data .= $enc_opt->packed_options();
   79: 	$msg->add_option($OPT_IA_NA, $option_data);
   80: }
   81: 
   82: # add Reconfigure Accept (required by DOCSIS)
   83: $msg->add_option($OPT_RECONF_ACCEPT, "");
   84: 
   85: # add Options Request (required by DOCSIS, recommended by RFC 3315)
   86: my @oro = ( $OPT_TIME_SERVERS, $OPT_TIME_OFFSET );
   87: $msg->add_option($OPT_ORO, pack("n*", @oro));
   88: 
   89: # add Vendor Class option (required by DOCSIS)
   90: $msg->add_option($OPT_VENDOR_CLASS, pack("N", 4491) . "docsis3.0");
   91: 
   92: # add Vendor-specific Information Option option (required by DOCSIS)
   93: my $vsio = pack("N", 4491);
   94: 
   95: # ORO (required by DOCSIS)
   96: my @docsis_oro = ( $DOCSIS_OPT_TFTP_SERVERS );
   97: $vsio .= pack("nnC*", $DOCSIS_OPT_ORO, 0+@docsis_oro, @docsis_oro);
   98: 
   99: # TLV5 data: CMTS DOCSIS version number 3.0 (required by DOCSIS)
  100: my $tlv5_data = "\x01\x02\x03\x0";  
  101: $vsio .= pack("nn", $DOCSIS_OPT_TLV5, length($tlv5_data)) . $tlv5_data;
  102: 
  103: # DOCSIS Device (required by DOCSIS)
  104: my $docsis_device_id = dhcp_client::mac_addr_binary();
  105: $vsio .= pack("nn", $DOCSIS_OPT_DEVICE_ID, length($docsis_device_id));
  106: $vsio .= $docsis_device_id;
  107: 
  108: $msg->add_option($OPT_VENDOR_OPTS, $vsio);
  109: 
  110: # add Rapid Commit option (required by DOCSIS)
  111: $msg->add_option($OPT_RAPID_COMMIT, "");
  112: 
  113: # timeout parameters, from DOCSIS
  114: my $IRT = $SOL_TIMEOUT;
  115: my $MRT = $SOL_MAX_RT;
  116: my $MRC = 4;	# DOCSIS says 4, RFC 3315 says it SHOULD be 0
  117: my $MRD = 0;
  118: 
  119: # sleep a random amount of time between 0 and 1 second, required by RFC 3315
  120: # XXX: this seems pretty stupid
  121: sleep(rand($SOL_MAX_DELAY));
  122: 
  123: my $RT;
  124: my $count = 0;
  125: my $mrd_end_time;
  126: if ($MRD != 0) {
  127: 	$mrd_end_time = time() + $MRD;
  128: }
  129: my $reply_msg;
  130: do {
  131: 	# create our socket, and send our Solicit
  132: 	socket(SOCK, PF_INET6, SOCK_DGRAM, getprotobyname('udp')) || die;
  133: 	my $addr = inet_pton(AF_INET6, $All_DHCP_Servers);
  134: 	my $packet = $msg->packet();
  135: 	my $send_ret = send(SOCK, $packet, 0, 
  136: 			    pack_sockaddr_in6($server_port, $addr));
  137: 	if (not defined($send_ret)) {
  138: 		printf STDERR 
  139: 			"Error \%d sending DHCPv6 Solicit message;\n\%s\n",
  140: 			0+$ERRNO, $ERRNO;
  141: 		exit(1);
  142: 	} elsif ($send_ret != length($packet)) {
  143: 		print STDERR "Unable to send entire DHCPv6 Solicit message.\n";
  144: 		exit(1);
  145: 	}
  146: 	$count++;
  147: 
  148: 	my $RAND = rand(0.2) - 0.1;
  149: 	if (defined $RT) {
  150: 		$RT = 2*$RT + $RAND*$RT;
  151: 		if (($RT > $MRT) && ($MRT != 0)) {
  152: 			$RT = $MRT + $RAND*$RT;
  153: 		}
  154: 	} else {
  155: 		$RT = $IRT + $RAND*$IRT;
  156: 	}
  157: 
  158: 	my $rt_end_time = time() + $RT;
  159: 	if (defined($mrd_end_time) && ($mrd_end_time > $rt_end_time)) { 
  160: 		$rt_end_time = $mrd_end_time;
  161: 	}
  162: 
  163: 	for (;;) {
  164: 		my $timeout = $rt_end_time - time();
  165: 		if ($timeout < 0) {
  166: #			print STDERR "Timeout waiting for DHCPv6 Advertise ",
  167: #				"or Reply message.\n";
  168: 			last;
  169: 		}
  170: 
  171: 		my @ready = IO::Select->new(\*SOCK)->can_read($timeout);
  172: 
  173: 		if (@ready) {
  174: 			my $reply;
  175: 			my $recv_ret;
  176: 	
  177: 			$recv_ret = recv(SOCK, $reply, 1500, 0);
  178: 			if (not defined $recv_ret) {
  179: 				printf STDERR 
  180: 					"Error \%d receiving DHCPv6 " . 
  181: 						"message;\n\%s\n",
  182: 					0+$ERRNO, $ERRNO;
  183: 				exit(1);
  184: 			}
  185: 
  186: 			$reply_msg = dhcp_client::msg::decode($reply, 1);
  187: 			if (($reply_msg->{msg_type} == $MSG_ADVERTISE) ||
  188: 			    ($reply_msg->{msg_type} == $MSG_REPLY)) {
  189: 			    	last;
  190: 			}
  191: 		}
  192: 	}
  193: 
  194: } until ($reply_msg || 
  195: 	 (($MRC != 0) && ($count > $MRC)) ||
  196: 	 (defined($mrd_end_time) && ($mrd_end_time > time())));
  197: 
  198: unless ($reply_msg) {
  199: 	if (($MRC != 0) && ($count >= $MRC)) {
  200: 		print STDERR 
  201: 			"No reply after maximum retransmission count.\n";
  202: 	} else {
  203: 		print STDERR 
  204: 			"No reply after maximum retransmission duration.\n";
  205: 	}
  206: }
  207: 
  208: if ($reply_msg && ($reply_msg->{msg_type} == $MSG_REPLY)) {
  209: 	print "Got DHCPv6 Reply message.\n";
  210: #print Dumper($reply_msg), "\n";
  211: 	exit(0);
  212: }
  213: 
  214: #print Dumper($msg), "\n";
  215: #print Dumper($msg->packet()), "\n";
  216: #
  217: #print "packet length: ", length($msg->packet()), "\n";
  218: