Class: LogStash::Filters::Opnsensefilter

Inherits:
Base
  • Object
show all
Defined in:
lib/logstash/filters/opnsensefilter.rb

Instance Method Summary collapse

Instance Method Details

#filter(event) ⇒ Object 



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# File 'lib/logstash/filters/opnsensefilter.rb', line 20

def filter(event)

  if @field_name
    data = event.get(@field_name).split(",")
    # meta
    event.set("#{@prefix}rule", data[0].to_i)
    event.set("#{@prefix}subrule", data[3].to_i)
    event.set("#{@prefix}input_interface", data[4])
    event.set("#{@prefix}reason", data[5])
    event.set("#{@prefix}action", data[6])
    event.set("#{@prefix}direction_of_traffic", data[7])
    event.set("#{@prefix}ip_version", data[8].to_i)
    if data[8].to_i == 4
      # IPv4
      ip_proto = true
      proto_start = 20
      protocol = data[16]
      event.set("#{@prefix}tos", data[9].to_i(16))
      event.set("#{@prefix}ecn", data[10])
      event.set("#{@prefix}hop_limit", data[11].to_i)
      event.set("#{@prefix}aid", data[12].to_i)
      event.set("#{@prefix}myoffset", data[13].to_i)
      event.set("#{@prefix}flags", data[14])
      event.set("#{@prefix}protocol_id", data[15].to_i)
      event.set("#{@prefix}protocol", data[16])
      event.set("#{@prefix}length", data[17].to_i)
      event.set("#{@prefix}source", data[18])
      event.set("#{@prefix}destination", data[19])
    elsif data[8].to_i == 6
      # IPv6
      ip_proto = true
      proto_start = 17
      protocol = data[12]
      event.set("#{@prefix}klass", data[9].to_i(16))
      event.set("#{@prefix}flow_label", data[10].to_i(16))
      event.set("#{@prefix}hop_limit", data[11].to_i)
      event.set("#{@prefix}protocol", data[12])
      event.set("#{@prefix}protocol_id", data[13].to_i)
      event.set("#{@prefix}length", data[14].to_i)
      event.set("#{@prefix}source", data[15])
      event.set("#{@prefix}destination", data[16])
    end
    if ip_proto
      if protocol.downcase == "tcp" || protocol.downcase == "udp"
        event.set("#{@prefix}spt", data[proto_start].to_i)
        event.set("#{@prefix}dpt", data[proto_start + 1].to_i)
        event.set("#{@prefix}length", data[proto_start + 2].to_i)
      end
      if protocol.downcase == "tcp"
        event.set("#{@prefix}tcp_flags", data[proto_start + 3])
        event.set("#{@prefix}sequence_number", data[proto_start + 4])
        event.set("#{@prefix}ack_number", data[proto_start + 5].to_i)
        event.set("#{@prefix}window", data[proto_start + 6].to_i)
        event.set("#{@prefix}urgent_pointer", data[proto_start + 7])
        event.set("#{@prefix}options", data[proto_start + 8])
      end
    end
  end

  filter_matched(event)
end

#register ⇒ Object 



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# File 'lib/logstash/filters/opnsensefilter.rb', line 15

def register
  # Add instance variables
end