Class: Dap::Filter::FilterDecodeNetbiosStatusReply

Inherits:

Object

• Object
• Dap::Filter::FilterDecodeNetbiosStatusReply

Includes:

BaseDecoder

Defined in:

lib/dap/filter/udp.rb

Overview

Decode a NetBIOS status probe response ( zmap: netbios_137.pkt )

Instance Attribute Summary

Attributes included from Base

#name, #opts

Instance Method Summary

• #decode(data) ⇒ Object
• #mac_company(address) ⇒ Object
• #mac_company_name(address) ⇒ Object

Methods included from BaseDecoder

#process

Methods included from Base

#initialize, #process

Instance Method Details

#decode(data) ⇒ Object

# File 'lib/dap/filter/udp.rb', line 182

def decode(data)
  ret = {}
  head = data.slice!(0,12)

  xid, flags, quests, answers, auths, adds = head.unpack('n6')
  return if quests != 0
  return if answers == 0

  qname = data.slice!(0,34)
  rtype,rclass,rttl,rlen = data.slice!(0,10).unpack('nnNn')
  return if not rlen

  buff = data.slice!(0,rlen)

  names = []

  case rtype
  when 0x21
    hname = nil
    inf = ''
    rcnt = buff.slice!(0,1).unpack("C")[0]
    return unless rcnt
    1.upto(rcnt) do
      tname = buff.slice!(0,15).gsub(/\x00.*/, '').strip
      ttype = buff.slice!(0,1).unpack("C")[0]
      tflag = buff.slice!(0,2).unpack('n')[0]
      names << [ tname, ttype, tflag ]
    end

    maddr = buff.slice!(0,6).unpack("C*").map{|c| "%.2x" % c }.join(":")
    names.each do |name|
      inf << name[0]

      next unless name[1]
      inf << ":%.2x" % name[1]

      next unless name[2]
      if (name[2] & 0x8000 == 0)
        inf << ":U "
      else
        inf << ":G "
      end
    end
  end

  return unless names.length > 0

  {}.tap do |hash|
    hash['netbios_names'] = (inf)
    hash['netbios_mac']   = maddr
    hash['netbios_hname'] = names[0][0]
    unless maddr == '00:00:00:00:00:00'
      hash['netbios_mac_company']      = mac_company(maddr)
      hash['netbios_mac_company_name'] = mac_company_name(maddr)
    end
  end
end

#mac_company(address) ⇒ Object

# File 'lib/dap/filter/udp.rb', line 240

def mac_company(address)
  begin
    name = Dap::Utils::Oui.lookup_oui_fullname(address)
    name.split("/").first.strip
  rescue => error
    ''
  end
end

#mac_company_name(address) ⇒ Object

# File 'lib/dap/filter/udp.rb', line 249

def mac_company_name(address)
  begin
    Dap::Utils::Oui.lookup_oui_company_name(address)
  rescue => error
    ''
  end
end