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PacketFu::ARPPacket

ARPPacket is used to construct ARP packets. They contain an EthHeader and an ARPHeader.

Example

require 'packetfu'
arp_pkt = PacketFu::ARPPacket.new(:flavor => "Windows")
arp_pkt.arp_saddr_mac="00:1c:23:44:55:66"  # Your hardware address
arp_pkt.arp_saddr_ip="10.10.10.17"  # Your IP address
arp_pkt.arp_daddr_ip="10.10.10.1"  # Target IP address
arp_pkt.arp_opcode=1  # Request

arp_pkt.to_w('eth0')        # Inject on the wire. (requires root)
arp_pkt.to_f('/tmp/arp.pcap') # Write to a file.

Parameters

:flavor
 Sets the "flavor" of the ARP packet. Choices are currently:
   :windows, :linux, :hp_deskjet 
:eth
 A pre-generated EthHeader object. If not specified, a new one will be created.
:arp
 A pre-generated ARPHeader object. If not specificed, a new one will be created.
:config
 A hash of return address details, often the output of Utils.whoami?

Attributes

arp_header[RW]
eth_header[RW]

Public Class Methods

can_parse?(str) click to toggle source
# File lib/packetfu/protos/arp.rb, line 39
def self.can_parse?(str)
        return false unless EthPacket.can_parse? str
        return false unless str.size >= 28
        return false unless str[12,2] == "\x08\x06"
        true
end
new(args={}) click to toggle source
# File lib/packetfu/protos/arp.rb, line 53
def initialize(args={})
        @eth_header = EthHeader.new(args).read(args[:eth])
        @arp_header = ARPHeader.new(args).read(args[:arp]) 
        @eth_header.eth_proto = "\x08\x06"
        @eth_header.body=@arp_header

        # Please send more flavors to todb+packetfu@planb-security.net.
        # Most of these initial fingerprints come from one (1) sample.
        case (args[:flavor].nil?) ? :nil : args[:flavor].to_s.downcase.intern
        when :windows; @arp_header.body = "\x00" * 64                                # 64 bytes of padding 
        when :linux; @arp_header.body = "\x00" * 4 +                         # 32 bytes of padding 
                "\x00\x07\x5c\x14" + "\x00" * 4 +
                "\x00\x0f\x83\x34" + "\x00\x0f\x83\x74" +
                "\x01\x11\x83\x78" + "\x00\x00\x00\x0c" + 
                "\x00\x00\x00\x00"
        when :hp_deskjet;                                                                                                                                    # Pads up to 60 bytes.
                @arp_header.body = "\xe0\x90\x0d\x6c" + 
                "\xff\xff\xee\xee" + "\x00" * 4 + 
                "\xe0\x8f\xfa\x18\x00\x20"  
        else; @arp_header.body = "\x00" * 18                                                         # Pads up to 60 bytes.
        end

        @headers = [@eth_header, @arp_header]
        super
end

Public Instance Methods

peek_format() click to toggle source

Generates summary data for ARP packets.

# File lib/packetfu/protos/arp.rb, line 80
def peek_format
        peek_data = ["A  "]
        peek_data << "%-5d" % self.to_s.size
        peek_data << arp_saddr_mac
        peek_data << "(#{arp_saddr_ip})"
        peek_data << "->"
        peek_data << case arp_daddr_mac
                                                                when "00:00:00:00:00:00"; "Bcast00"
                                                                when "ff:ff:ff:ff:ff:ff"; "BcastFF"
                                                                else; arp_daddr_mac
                                                                end
        peek_data << "(#{arp_daddr_ip})"
        peek_data << ":"
        peek_data << case arp_opcode
                                                                when 1; "Requ"
                                                                when 2; "Repl"
                                                                when 3; "RReq"
                                                                when 4; "RRpl"
                                                                when 5; "IReq"
                                                                when 6; "IRpl"
                                                                else; "0x%02x" % arp_opcode
                                                                end
        peek_data.join
end
read(str=nil,args={}) click to toggle source
# File lib/packetfu/protos/arp.rb, line 46
def read(str=nil,args={})
        raise "Cannot parse `#{str}'" unless self.class.can_parse?(str)
        @eth_header.read(str)
        super(args)
        self
end
recalc(args={}) click to toggle source

While there are lengths in ARPPackets, there’s not much to do with them.

# File lib/packetfu/protos/arp.rb, line 107
def recalc(args={})
        @headers[0].inspect
end

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