metasploit-framework/lib/racket/l4/vrrp.rb

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# $Id: vrrp.rb 127 2009-11-29 01:30:46Z jhart $
#
# Copyright (c) 2008, Jon Hart
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are met:
# * Redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer.
# * Redistributions in binary form must reproduce the above copyright
# notice, this list of conditions and the following disclaimer in the
# documentation and/or other materials provided with the distribution.
# * Neither the name of the <organization> nor the
# names of its contributors may be used to endorse or promote products
# derived from this software without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY Jon Hart ``AS IS'' AND ANY
# EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
# WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
# DISCLAIMED. IN NO EVENT SHALL Jon Hart BE LIABLE FOR ANY
# DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
# (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
# LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
# ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
# SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#
module Racket
module L4
# Virtual Router Redundancy Protocol (VRRP)
# http://tools.ietf.org/html/rfc2338
# http://tools.ietf.org/html/rfc3768
class VRRP < RacketPart
# Version
unsigned :version, 4
# VRRP packet type
unsigned :type, 4
# Virtual Router Identifier (VRID)
unsigned :id, 8
# the sending VRRP router's priority for the virtual router.
# Higher values equal higher priority.
unsigned :priority, 8
# Total number of IPs contained in this VRRP message
unsigned :num_ips, 8
# Authentication type (0, 1, 2)
unsigned :auth_type, 8
# Advertisement interval
unsigned :interval, 8
# Checksum
unsigned :checksum, 16
rest :payload
# Add a new IP to this message
def add_ip(ip)
@ips << L3::Misc.ipv42long(ip)
end
# Add authentication data
def add_auth(authdata)
@authdata = authdata[0,8].ljust(32, "\x00")
end
# Validate the checksum
def checksum?
self.checksum == compute_checksum
end
# compute and set the checksum
def checksum!
self.checksum = compute_checksum
end
# (really, just set the checksum)
def fix!
self.payload = [@ips, @authdata].flatten.pack("N#{@ips.size}a*")
self.num_ips = @ips.size
self.checksum!
end
def initialize(*args)
@ips = []
@authdata = ""
super
end
private
def compute_checksum
# pseudo header used for checksum calculation as per RFC 768
pseudo = [ ((self.version << 4) | self.type), self.id, self.priority, self.num_ips, self.auth_type, self.interval, 0, self.payload ]
L3::Misc.checksum(pseudo.pack("CCCCCCna*"))
end
end
end
end
# vim: set ts=2 et sw=2: