231 lines
6.4 KiB
Ruby
231 lines
6.4 KiB
Ruby
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module PacketFu
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# AddrIpv6 handles addressing for IPv6Header
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#
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# ==== Header Definition
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#
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# Int32 :a1
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# Int32 :a2
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# Int32 :a3
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# Int32 :a4
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class AddrIpv6 < Struct.new(:a1, :a2, :a3, :a4)
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include StructFu
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def initialize(args={})
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super(
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Int32.new(args[:a1]),
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Int32.new(args[:a2]),
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Int32.new(args[:a3]),
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Int32.new(args[:a4]))
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end
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# Returns the address in string format.
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def to_s
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self.to_a.map {|x| x.to_s}.join
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end
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# Returns the address as a fairly ginormous integer.
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def to_i
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(a1.to_i << 96) + (a2.to_i << 64) + (a3.to_i << 32) + a4.to_i
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end
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# Returns the address as a colon-delimited hex string.
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def to_x
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IPAddr.new(self.to_i, Socket::AF_INET6).to_s
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end
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# Reads in a string and casts it as an IPv6 address
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def read(str)
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force_binary(str)
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return self if str.nil?
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self[:a1].read str[0,4]
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self[:a2].read str[4,4]
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self[:a3].read str[8,4]
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self[:a4].read str[12,4]
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self
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end
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# Reads in a colon-delimited hex string and casts it as an IPv6 address.
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def read_x(str)
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addr = IPAddr.new(str).to_i
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self[:a1]=Int32.new(addr >> 96)
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self[:a2]=Int32.new((addr & 0x00000000ffffffff0000000000000000) >> 64)
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self[:a3]=Int32.new((addr & 0x0000000000000000ffffffff00000000) >> 32)
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self[:a4]=Int32.new(addr & 0x000000000000000000000000ffffffff)
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self
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end
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end
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# IPv6Header is complete IPv6 struct, used in IPv6Packet.
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#
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# ==== Header Definition
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#
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# Fixnum (4 bits) :ipv6_v Default: 6 # Versiom
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# Fixnum (8 bits) :ipv6_class Defualt: 0 # Class
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# Fixnum (20 bits) :ipv6_label Defualt: 0 # Label
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# Int16 :ipv6_len Default: calc # Payload length
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# Int8 :ipv6_next # Next Header
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# Int8 :ipv6_hop Default: 0xff # Hop limit
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# AddrIpv6 :ipv6_src
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# AddrIpv6 :ipv6_dst
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# String :body
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class IPv6Header < Struct.new(:ipv6_v, :ipv6_class, :ipv6_label,
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:ipv6_len, :ipv6_next, :ipv6_hop,
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:ipv6_src, :ipv6_dst, :body)
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include StructFu
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def initialize(args={})
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super(
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(args[:ipv6_v] || 6),
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(args[:ipv6_class] || 0),
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(args[:ipv6_label] || 0),
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Int16.new(args[:ipv6_len]),
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Int8.new(args[:ipv6_next]),
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Int8.new(args[:ipv6_hop] || 0xff),
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AddrIpv6.new.read(args[:ipv6_src] || ("\x00" * 16)),
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AddrIpv6.new.read(args[:ipv6_dst] || ("\x00" * 16)),
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StructFu::String.new.read(args[:body])
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)
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end
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# Returns the object in string form.
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def to_s
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bytes_v_class_label = [(self.ipv6_v << 28) +
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(self.ipv6_class << 20) +
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self.ipv6_label].pack("N")
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bytes_v_class_label + (self.to_a[3,6].map {|x| x.to_s}.join)
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end
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# Reads a string to populate the object.
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def read(str)
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force_binary(str)
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return self if str.nil?
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self[:ipv6_v] = str[0,1].unpack("C").first >> 4
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self[:ipv6_class] = (str[0,2].unpack("n").first & 0x0ff0) >> 4
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self[:ipv6_label] = str[0,4].unpack("N").first & 0x000fffff
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self[:ipv6_len].read(str[4,2])
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self[:ipv6_next].read(str[6,1])
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self[:ipv6_hop].read(str[7,1])
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self[:ipv6_src].read(str[8,16])
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self[:ipv6_dst].read(str[24,16])
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self[:body].read(str[40,str.size]) if str.size > 40
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self
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end
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# Setter for the version (usually, 6).
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def ipv6_v=(i); self[:ip_v] = i.to_i; end
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# Getter for the version (usually, 6).
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def ipv6_v; self[:ipv6_v].to_i; end
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# Setter for the traffic class.
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def ipv6_class=(i); self[:ip_class] = i.to_i; end
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# Getter for the traffic class.
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def ipv6_class; self[:ipv6_class].to_i; end
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# Setter for the flow label.
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def ipv6_label=(i); self[:ip_label] = i.to_i; end
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# Getter for the flow label.
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def ipv6_label; self[:ipv6_label].to_i; end
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# Setter for the payload length.
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def ipv6_len=(i); typecast i; end
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# Getter for the payload length.
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def ipv6_len; self[:ipv6_len].to_i; end
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# Setter for the next protocol header.
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def ipv6_next=(i); typecast i; end
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# Getter for the next protocol header.
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def ipv6_next; self[:ipv6_next].to_i; end
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# Setter for the hop limit.
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def ipv6_hop=(i); typecast i; end
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# Getter for the hop limit.
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def ipv6_hop; self[:ipv6_hop].to_i; end
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# Setter for the source address.
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def ipv6_src=(i); typecast i; end
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# Getter for the source address.
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def ipv6_src; self[:ipv6_src].to_i; end
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# Setter for the destination address.
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def ipv6_dst=(i); typecast i; end
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# Getter for the destination address.
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def ipv6_dst; self[:ipv6_dst].to_i; end
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# Calculates the payload length.
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def ipv6_calc_len
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self[:ipv6_len] = body.to_s.length
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end
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# Recalculates the calculatable fields for this object.
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def ipv6_recalc(arg=:all)
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case arg
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when :ipv6_len
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ipv6_calc_len
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when :all
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ipv6_recalc(:len)
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end
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end
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# Get the source address in a more readable form.
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def ipv6_saddr
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self[:ipv6_src].to_x
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end
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# Set the source address in a more readable form.
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def ipv6_saddr=(str)
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self[:ipv6_src].read_x(str)
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end
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# Get the destination address in a more readable form.
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def ipv6_daddr
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self[:ipv6_dst].to_x
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end
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# Set the destination address in a more readable form.
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def ipv6_daddr=(str)
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self[:ipv6_dst].read_x(str)
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end
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end # class IPv6Header
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# IPv6Packet is used to construct IPv6 Packets. They contain an EthHeader and an IPv6Header, and in
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# the distant, unknowable future, will take interesting IPv6ish payloads.
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#
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# This mostly complete, but not very useful. It's intended primarily as an example protocol.
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#
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# == Parameters
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#
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# :eth
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# A pre-generated EthHeader object.
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# :ip
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# A pre-generated IPHeader object.
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# :flavor
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# TODO: Sets the "flavor" of the IPv6 packet. No idea what this will look like, haven't done much IPv6 fingerprinting.
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# :config
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# A hash of return address details, often the output of Utils.whoami?
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class IPv6Packet < Packet
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attr_accessor :eth_header, :ipv6_header
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def initialize(args={})
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@eth_header = (args[:eth] || EthHeader.new)
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@ipv6_header = (args[:ipv6] || IPv6Header.new)
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@eth_header.eth_proto = 0x86dd
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@eth_header.body=@ipv6_header
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@headers = [@eth_header, @ipv6_header]
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super
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end
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# Peek provides summary data on packet contents.
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def peek(args={})
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peek_data = ["6 "]
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peek_data << "%-5d" % self.to_s.size
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peek_data << "%-31s" % self.ipv6_saddr
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peek_data << "-> "
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peek_data << "%-31s" % self.ipv6_daddr
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peek_data << " N:"
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peek_data << self.ipv6_next.to_s(16)
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peek_data.join
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end
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end
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end
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