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PacketFu::ICMPPacket

ICMPPacket is used to construct ICMP Packets. They contain an EthHeader, an IPHeader, and a ICMPHeader.

Example

icmp_pkt.new
icmp_pkt.icmp_type = 8
icmp_pkt.icmp_code = 0
icmp_pkt.payload = "ABC, easy as 123. As simple as do-re-mi. ABC, 123, baby, you and me!"

icmp_pkt.ip_saddr="1.2.3.4"
icmp_pkt.ip_daddr="5.6.7.8"

icmp_pkt.recalc    
icmp_pkt.to_f('/tmp/icmp.pcap')

Parameters

:eth
 A pre-generated EthHeader object.
:ip
 A pre-generated IPHeader object.
:flavor
 TODO: Sets the "flavor" of the ICMP packet. Pings, in particular, often betray their true
 OS.
:config
 A hash of return address details, often the output of Utils.whoami?

Attributes

eth_header[RW]
icmp_header[RW]
ip_header[RW]

Public Class Methods

can_parse?(str) click to toggle source
# File lib/packetfu/protos/icmp.rb, line 44
def self.can_parse?(str)
  return false unless str.size >= 38
  return false unless EthPacket.can_parse? str
  return false unless IPPacket.can_parse? str
  return false unless str[23,1] == "\x01"
  return true
end
new(args={}) click to toggle source
# File lib/packetfu/protos/icmp.rb, line 59
def initialize(args={})
  @eth_header = EthHeader.new(args).read(args[:eth])
  @ip_header = IPHeader.new(args).read(args[:ip])
  @ip_header.ip_proto = 1
  @icmp_header = ICMPHeader.new(args).read(args[:icmp])

  @ip_header.body = @icmp_header
  @eth_header.body = @ip_header

  @headers = [@eth_header, @ip_header, @icmp_header]
  super
end

Public Instance Methods

peek_format() click to toggle source

Peek provides summary data on packet contents.

# File lib/packetfu/protos/icmp.rb, line 73
def peek_format
  peek_data = ["IC "] # I is taken by IP
  peek_data << "%-5d" % self.to_s.size
  type = case self.icmp_type.to_i
         when 8
           "ping"
         when 0
           "pong"
         else
           "%02x-%02x" % [self.icmp_type, self.icmp_code]
         end
  peek_data << "%-21s" % "#{self.ip_saddr}:#{type}"
  peek_data << "->"
  peek_data << "%21s" % "#{self.ip_daddr}"
  peek_data << "%23s" % "I:"
  peek_data << "%04x" % self.ip_id
  peek_data.join
end
read(str=nil, args={}) click to toggle source
# File lib/packetfu/protos/icmp.rb, line 52
def read(str=nil, args={})
  raise "Cannot parse `#{str}'" unless self.class.can_parse?(str)
  @eth_header.read(str)
  super(args)
  self
end

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