Class: PacketFu::HSRPPacket

Inherits:
Packet
  • Object
show all
Includes:
EthHeaderMixin, HSRPHeaderMixin, IPHeaderMixin, UDPHeaderMixin
Defined in:
lib/packetfu/protos/hsrp.rb

Overview

HSRPPacket is used to construct HSRP Packets. They contain an EthHeader, an IPHeader, and a UDPHeader.

Example

hsrp_pkt.new
hsrp_pkt.hsrp_opcode = 0
hsrp_pkt.hsrp_state = 16
hsrp_pkt.hsrp_priority = 254
hsrp_pkt.hsrp_group = 1
hsrp_pkt.hsrp_vip = 10.100.100.254
hsrp_pkt.recalc
hsrp_pkt.to_f('/tmp/hsrp.pcap')

Parameters

:eth
 A pre-generated EthHeader object.
:ip
 A pre-generated IPHeader object.
:udp
 A pre-generated UDPHeader object.
:flavor
 TODO: HSRP packets don't tend have any flavor.
:config
 A hash of return address details, often the output of Utils.whoami?

Instance Attribute Summary collapse

Attributes inherited from Packet

#flavor, #headers, #iface, #inspect_style

Class Method Summary collapse

Instance Method Summary collapse

Methods included from HSRPHeaderMixin

#hsrp_addr, #hsrp_addr=, #hsrp_group, #hsrp_group=, #hsrp_hellotime, #hsrp_hellotime=, #hsrp_holdtime, #hsrp_holdtime=, #hsrp_opcode, #hsrp_opcode=, #hsrp_password, #hsrp_password=, #hsrp_password_readable, #hsrp_priority, #hsrp_priority=, #hsrp_reserved, #hsrp_reserved=, #hsrp_state, #hsrp_state=, #hsrp_version, #hsrp_version=, #hsrp_vip, #hsrp_vip=, #hsrp_vip_readable

Methods included from UDPHeaderMixin

#udp_calc_len, #udp_dport, #udp_dport=, #udp_dst, #udp_dst=, #udp_len, #udp_len=, #udp_recalc, #udp_sport, #udp_sport=, #udp_src, #udp_src=, #udp_sum, #udp_sum=, #udp_sum_readable

Methods included from IPHeaderMixin

#ip_calc_id, #ip_calc_len, #ip_calc_sum, #ip_daddr, #ip_daddr=, #ip_dst, #ip_dst=, #ip_dst_readable, #ip_frag, #ip_frag=, #ip_hl, #ip_hl=, #ip_hlen, #ip_id, #ip_id=, #ip_id_readable, #ip_len, #ip_len=, #ip_proto, #ip_proto=, #ip_recalc, #ip_saddr, #ip_saddr=, #ip_src, #ip_src=, #ip_src_readable, #ip_sum, #ip_sum=, #ip_sum_readable, #ip_tos, #ip_tos=, #ip_ttl, #ip_ttl=, #ip_v, #ip_v=

Methods included from EthHeaderMixin

#eth_daddr, #eth_daddr=, #eth_dst, #eth_dst=, #eth_dst_readable, #eth_proto, #eth_proto=, #eth_proto_readable, #eth_saddr, #eth_saddr=, #eth_src, #eth_src=, #eth_src_readable

Methods inherited from Packet

#==, #clone, #dissect, #dissection_table, force_binary, #handle_is_identity, #hexify, inherited, #inspect, #inspect_hex, #kind_of?, #layer, layer, layer_symbol, #layer_symbol, #method_missing, #orig_kind_of?, parse, #payload, #payload=, #peek, #proto, #recalc, #respond_to?, #size, #to_f, #to_pcap, #to_s, #to_w, #write

Constructor Details

#initialize(args = {}) ⇒ HSRPPacket


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# File 'lib/packetfu/protos/hsrp.rb', line 69

def initialize(args={})
  @eth_header = EthHeader.new(args).read(args[:eth])
  @ip_header = IPHeader.new(args).read(args[:ip])
  @ip_header.ip_proto = 0x11
  @udp_header = UDPHeader.new(args).read(args[:udp])
  @hsrp_header = HSRPHeader.new(args).read(args[:hsrp])
  @udp_header.body = @hsrp_header
  @ip_header.body = @udp_header
  @eth_header.body = @ip_header
  @headers = [@eth_header, @ip_header, @udp_header, @hsrp_header]
  super
end

Dynamic Method Handling

This class handles dynamic methods through the method_missing method in the class PacketFu::Packet

Instance Attribute Details

#eth_headerObject

Returns the value of attribute eth_header


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# File 'lib/packetfu/protos/hsrp.rb', line 46

def eth_header
  @eth_header
end

#hsrp_headerObject

Returns the value of attribute hsrp_header


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# File 'lib/packetfu/protos/hsrp.rb', line 46

def hsrp_header
  @hsrp_header
end

#ip_headerObject

Returns the value of attribute ip_header


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# File 'lib/packetfu/protos/hsrp.rb', line 46

def ip_header
  @ip_header
end

#udp_headerObject

Returns the value of attribute udp_header


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# File 'lib/packetfu/protos/hsrp.rb', line 46

def udp_header
  @udp_header
end

Class Method Details

.can_parse?(str) ⇒ Boolean


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# File 'lib/packetfu/protos/hsrp.rb', line 48

def self.can_parse?(str)
  return false unless str.size >= 54
  return false unless EthPacket.can_parse? str
  return false unless IPPacket.can_parse? str
  return false unless UDPPacket.can_parse? str
  temp_packet = UDPPacket.new
  temp_packet.read(str)
  if temp_packet.ip_ttl == 1 and [temp_packet.udp_sport,temp_packet.udp_dport] == [1985,1985] 
    return true
  else 
    return false
  end
end

Instance Method Details

#peek_formatObject

Peek provides summary data on packet contents.


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# File 'lib/packetfu/protos/hsrp.rb', line 83

def peek_format
  peek_data = ["UH "]
  peek_data << "%-5d" % self.to_s.size
  peek_data << "%-16s" % self.hsrp_addr
  peek_data << "%-4d" % self.hsrp_group
  peek_data << "%-35s" % self.hsrp_password_readable
  peek_data << "%-15s" % self.ip_saddr
  peek_data.join
end

#read(str = nil, args = {}) ⇒ Object


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# File 'lib/packetfu/protos/hsrp.rb', line 62

def read(str=nil, args={})
  raise "Cannot parse `#{str}'" unless self.class.can_parse?(str)
  @eth_header.read(str)
  super(args)
  self
end