Class: PacketFu::LLDPHeader

Inherits:
Struct
  • Object
show all
Includes:
StructFu
Defined in:
lib/packetfu/protos/lldp/header.rb

Overview

LLDPHeader is a complete LLDP struct, used in LLDPPacket.

Instance Attribute Summary collapse

Instance Method Summary collapse

Methods included from StructFu

#body=, #clone, #set_endianness, #sz, #typecast

Methods inherited from Struct

#force_binary

Constructor Details

#initialize(args = {}) ⇒ LLDPHeader

Returns a new instance of LLDPHeader.



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# File 'lib/packetfu/protos/lldp/header.rb', line 8

def initialize(args={})
  src_mac = (args[:lldp_port_id] if :lldp_port_id_type == 3) || (args[:config][:eth_src] if args[:config])
  src_ip_bin = (args[:lldp_address] if :lldp_address_type == 1) || (args[:config][:ip_src_bin] if args[:config])

  super(Int8.new(args[:lldp_chassis_id_type] || 4),
  StructFu::String.new.read(:lldp_chassis_id),
  Int8.new(args[:lldp_port_id_type] || 3),
  EthMac.new.read(src_mac),
  Int16.new(args[:lldp_ttl] || 120),
  StructFu::String.new.read(:lldp_port_description) || "",
  StructFu::String.new.read(:lldp_system_name) || "",
  StructFu::String.new.read(:lldp_system_description) || "",
  Int16.new(args[:lldp_capabilty] || 0x0080),
  Int16.new(args[:lldp_enabled_capability] || 0x0080),
  Int8.new(args[:lldp_address_type] || 1),
  StructFu::String.new.read(:lldp_address) || src_ip_bin,
  Int8.new(args[:lldp_interface_type] || 2),
  Int32.new(args[:lldp_interface]),
  StructFu::String.new.read(:lldp_oid) || ""
  )
end

Instance Attribute Details

#lldp_address=(value) ⇒ Object

Sets the attribute lldp_address

Parameters:

  • value (Object) —

    the value to set the attribute lldp_address to.

Returns:

  • (Object) —

    the newly set value



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# File 'lib/packetfu/protos/lldp/header.rb', line 5

def lldp_address=(value)
  @lldp_address = value
end

#lldp_address_type ⇒ Object

Getter for the LLDP address type.



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# File 'lib/packetfu/protos/lldp/header.rb', line 5

def lldp_address_type
  @lldp_address_type
end

#lldp_capabilty ⇒ Object

Returns the value of attribute lldp_capabilty

Returns:

  • (Object) —

    the current value of lldp_capabilty



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# File 'lib/packetfu/protos/lldp/header.rb', line 5

def lldp_capabilty
  @lldp_capabilty
end

#lldp_chassis_id=(i) ⇒ Object

Setter for the LLDP chassis id.



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# File 'lib/packetfu/protos/lldp/header.rb', line 5

def lldp_chassis_id=(value)
  @lldp_chassis_id = value
end

#lldp_chassis_id_type ⇒ Object

Getter for the LLDP chassis id type.



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# File 'lib/packetfu/protos/lldp/header.rb', line 5

def lldp_chassis_id_type
  @lldp_chassis_id_type
end

#lldp_enabled_capability ⇒ Object

Returns the value of attribute lldp_enabled_capability

Returns:

  • (Object) —

    the current value of lldp_enabled_capability



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# File 'lib/packetfu/protos/lldp/header.rb', line 5

def lldp_enabled_capability
  @lldp_enabled_capability
end

#lldp_interface ⇒ Object

Getter for the LLDP interface type.



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# File 'lib/packetfu/protos/lldp/header.rb', line 5

def lldp_interface
  @lldp_interface
end

#lldp_interface_type ⇒ Object

Getter for the LLDP interface type.



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# File 'lib/packetfu/protos/lldp/header.rb', line 5

def lldp_interface_type
  @lldp_interface_type
end

#lldp_oid ⇒ Object

Getter for the LLDP oid type.



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# File 'lib/packetfu/protos/lldp/header.rb', line 5

def lldp_oid
  @lldp_oid
end

#lldp_port_description ⇒ Object

Getter for the LLDP port description.



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# File 'lib/packetfu/protos/lldp/header.rb', line 5

def lldp_port_description
  @lldp_port_description
end

#lldp_port_id ⇒ Object

Returns the value of attribute lldp_port_id

Returns:

  • (Object) —

    the current value of lldp_port_id



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# File 'lib/packetfu/protos/lldp/header.rb', line 5

def lldp_port_id
  @lldp_port_id
end

#lldp_port_id_type ⇒ Object

Getter for the LLDP port id type.



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# File 'lib/packetfu/protos/lldp/header.rb', line 5

def lldp_port_id_type
  @lldp_port_id_type
end

#lldp_system_description ⇒ Object

Getter for the LLDP system description.



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# File 'lib/packetfu/protos/lldp/header.rb', line 5

def lldp_system_description
  @lldp_system_description
end

#lldp_system_name ⇒ Object

Getter for the LLDP system name.



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# File 'lib/packetfu/protos/lldp/header.rb', line 5

def lldp_system_name
  @lldp_system_name
end

#lldp_ttl ⇒ Object

Getter for the LLDP ttl.



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# File 'lib/packetfu/protos/lldp/header.rb', line 5

def lldp_ttl
  @lldp_ttl
end

Instance Method Details

#lldp_address_type_readable ⇒ Object 



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# File 'lib/packetfu/protos/lldp/header.rb', line 223

def lldp_address_type_readable
  case lldp_address_type
  when 1
    "IPv4"
  when 2
    "IPv6"
  when 6
    "MAC"
  else
    lldp_address_type
  end
end

#lldp_capabilty_readable ⇒ Object 



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# File 'lib/packetfu/protos/lldp/header.rb', line 236

def lldp_capabilty_readable
  "0x%04x" % lldp_capabilty
end

#lldp_chassis_id_readable ⇒ Object

Getter for the LLDP chassis id .



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# File 'lib/packetfu/protos/lldp/header.rb', line 127

def lldp_chassis_id_readable()
  if self[:lldp_chassis_id_type].to_i == 4
    return EthHeader.str2mac(self[:lldp_chassis_id].to_s)
  else
    return self[:lldp_chassis_id].to_s
  end
end

#lldp_enabled_capability_readable ⇒ Object 



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# File 'lib/packetfu/protos/lldp/header.rb', line 240

def lldp_enabled_capability_readable
  "0x%04x" % lldp_enabled_capability
end

#lldp_port_id_readable ⇒ Object

Getter for the LLDP port id.



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# File 'lib/packetfu/protos/lldp/header.rb', line 141

def lldp_port_id_readable()
  #if mac addr
  if self[:lldp_port_id_type].to_i == 3
    return EthHeader.str2mac(self[:lldp_port_id].to_s)
  else
    return self[:lldp_port_id].to_s
  end
end

#lldp_saddr_ip ⇒ Object Also known as: lldp_address

Get a more readable source IP address.



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# File 'lib/packetfu/protos/lldp/header.rb', line 209

def lldp_saddr_ip
  #ipv4 or ipv6
  if (self[:lldp_address_type].to_i == 1) or (self[:lldp_address_type].to_i == 2)
    begin
      IPAddr::ntop(self[:lldp_address])
    rescue
      self[:lldp_address]
    end
  elsif  self[:lldp_address_type].to_i == 6
    #mac
    EthHeader.str2mac(self[:lldp_address].to_s)
  end
end

#lldp_saddr_ip=(addr) ⇒ Object

Set a more readable source IP address.



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# File 'lib/packetfu/protos/lldp/header.rb', line 203

def lldp_saddr_ip=(addr)
  self[:lldp_address_type] = 1
  self[:lldp_address].read_quad(addr)
end

#lldp_saddr_mac ⇒ Object Also known as: lldp_chassis_id

Get a more readable source MAC address.



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# File 'lib/packetfu/protos/lldp/header.rb', line 198

def lldp_saddr_mac
  EthHeader.str2mac(self[:lldp_port_id].to_s)
end

#lldp_saddr_mac=(mac) ⇒ Object

Set the source MAC address in a more readable way.



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# File 'lib/packetfu/protos/lldp/header.rb', line 151

def lldp_saddr_mac=(mac)
  mac = EthHeader.mac2str(mac)
  self[:lldp_port_id_type] = 3
  self[:lldp_port_id].read(mac)
  self.lldp_port_id
end

#read(str) ⇒ Object

Reads a string to populate the object.



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# File 'lib/packetfu/protos/lldp/header.rb', line 36

def read(str)
  force_binary(str)
  return self if str.nil?
  index = 0
  #check for lldp pdu end
  while (str[index,2] != "\x00\x00") && (index+2 < str.size)
    tlv_known = false
    #chassis subtype
    if str[index,1] == "\x02"
      tlv_known = true
      tlv_length = str[index+1,1].unpack("U*").join.to_i
      self[:lldp_chassis_id_type].read(str[index+2,1])
      self[:lldp_chassis_id].read(str[index+3, tlv_length - 1])
      index += tlv_length + 2
    end
    #port subtype
    if str[index,1] == "\x04"
      tlv_known = true
      tlv_length = str[index+1,1].unpack("U*").join.to_i
      self[:lldp_port_id_type].read(str[index+2,1])
      self[:lldp_port_id].read(str[index+3, tlv_length - 1])
      index += tlv_length + 2
    end
    #ttl subtype
    if str[index,1] == "\x06"
      tlv_known = true
      tlv_length = str[index+1,1].unpack("U*").join.to_i
      self[:lldp_ttl].read(str[index+2, tlv_length])
      index += tlv_length + 2
    end
    #port description
    if str[index,1] == "\x08"
      tlv_known = true
      tlv_length = str[index+1,1].unpack("U*").join.to_i
      self[:lldp_port_description].read(str[index+2, tlv_length])
      index += tlv_length + 2
    end
    #system name
    if str[index,1] == "\x0a"
      tlv_known = true
      tlv_length = str[index+1,1].unpack("U*").join.to_i
      self[:lldp_system_name].read(str[index+2, tlv_length])
      index += tlv_length + 2
    end
    #system description
    if str[index,1] == "\x0c"
      tlv_known = true
      tlv_length = str[index+1,1].unpack("U*").join.to_i
      self[:lldp_system_description].read(str[index+2, tlv_length])
      index += tlv_length + 2
    end
    #system capabilities
    if str[index,1] == "\x0e"
      tlv_known = true
      tlv_length = str[index+1,1].unpack("U*").join.to_i
      self[:lldp_capabilty].read(str[index+2, 2])
      self[:lldp_enabled_capability].read(str[index+4, 2])
      index += tlv_length + 2
    end
    #management address
    if str[index,1] == "\x10"
      tlv_known = true
      tlv_length = str[index + 1,1].unpack("U*").join.to_i
      addr_length = str[index + 2, 1].unpack("U*").join.to_i
      self[:lldp_address_type].read(str[index + 3, 1])
      self[:lldp_address].read(str[index + 4,addr_length - 1])
      self[:lldp_interface_type].read(str[index + addr_length + 3, 1].unpack("U*").join.to_i)
      self[:lldp_interface].read(str[index + addr_length + 4, 4])
      oid_string_length = str[index + addr_length + 8, 1].unpack("U*").join.to_i
      if oid_string_length > 0
        self[:lldp_oid].read(str[index + addr_length + 9, oid_string_length])
      end
      index += tlv_length + 2
    end

    #if tlv type is unknown jump over it
    unless tlv_known
      tlv_length = str[index+1,1].unpack("U*").join.to_i
      index += tlv_length + 2
    end
  end
  self
end

#to_s ⇒ Object

Returns the object in string form.



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# File 'lib/packetfu/protos/lldp/header.rb', line 31

def to_s
  self.to_a.map {|x| x.to_s}.join
end