Class: LogStash::Codecs::Netflow

Inherits:
Base
  • Object
show all
Defined in:
lib/logstash/codecs/netflow.rb

Overview

Documentation moved to docs/

Constant Summary collapse

NETFLOW5_FIELDS = 
['version', 'flow_seq_num', 'engine_type', 'engine_id', 'sampling_algorithm', 'sampling_interval', 'flow_records']
NETFLOW9_FIELDS = 
['version', 'flow_seq_num']
NETFLOW9_SCOPES = 
{
  1 => :scope_system,
  2 => :scope_interface,
  3 => :scope_line_card,
  4 => :scope_netflow_cache,
  5 => :scope_template,
}
IPFIX_FIELDS = 
['version']
SWITCHED = 
/_switched$/
FLOWSET_ID = 
"flowset_id"

Instance Method Summary collapse

Constructor Details

#initialize(params = {}) ⇒ Netflow

Returns a new instance of Netflow.



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# File 'lib/logstash/codecs/netflow.rb', line 52

def initialize(params = {})
  super(params)
  @threadsafe = false
end

Instance Method Details

#decode(payload, metadata = nil, &block) ⇒ Object

def register



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# File 'lib/logstash/codecs/netflow.rb', line 97

def decode(payload, metadata = nil, &block)
  header = Header.read(payload)

  unless @versions.include?(header.version)
    @logger.warn("Ignoring Netflow version v#{header.version}")
    return
  end

  if header.version == 5
    flowset = Netflow5PDU.read(payload)
    flowset.records.each do |record|
      yield(decode_netflow5(flowset, record))
    end
  elsif header.version == 9
#     BinData::trace_reading do
    flowset = Netflow9PDU.read(payload)
    flowset.records.each do |record|
      if metadata != nil
        decode_netflow9(flowset, record, metadata).each{|event| yield(event)}
      else
        decode_netflow9(flowset, record).each{|event| yield(event)}
      end
#      end
   end
  elsif header.version == 10
    flowset = IpfixPDU.read(payload)
    flowset.records.each do |record|
      decode_ipfix(flowset, record).each { |event| yield(event) }
    end
  else
    @logger.warn("Unsupported Netflow version v#{header.version}")
  end
rescue BinData::ValidityError, IOError => e
  @logger.warn("Invalid netflow packet received (#{e})")
end

#register ⇒ Object 



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# File 'lib/logstash/codecs/netflow.rb', line 57

def register
  require "logstash/codecs/netflow/util"
  @netflow_templates = Vash.new()
  @ipfix_templates = Vash.new()

  # Path to default Netflow v9 field definitions
  filename = ::File.expand_path('netflow/netflow.yaml', ::File.dirname(__FILE__))
  @netflow_fields = load_definitions(filename, @netflow_definitions)

  # Path to default IPFIX field definitions
  filename = ::File.expand_path('netflow/ipfix.yaml', ::File.dirname(__FILE__))
  @ipfix_fields = load_definitions(filename, @ipfix_definitions)

  if @cache_save_path
    if @versions.include?(9)
      cache_save_file_netflow = "#{@cache_save_path}/netflow_templates.cache"
      if File.exists?(cache_save_file_netflow)
        raise "#{self.class.name}: Template cache file #{cache_save_file_netflow} not writable" unless File.writable?(cache_save_file_netflow)
        @netflow_templates_cache = load_templates_cache("#{@cache_save_path}/netflow_templates.cache")
        @netflow_templates_cache.each{ |key, fields| @netflow_templates[key, @cache_ttl] = BinData::Struct.new(:endian => :big, :fields => fields) }
      else
        raise "#{self.class.name}: Template cache directory #{cache_save_path} not writable" unless File.writable?(cache_save_path)
        @netflow_templates_cache = {}
      end
    end

    if @versions.include?(10)
      cache_save_file_ipfix = "#{@cache_save_path}/ipfix_templates.cache"
      if File.exists?(cache_save_file_ipfix)
        raise "#{self.class.name}: Template cache file #{cache_save_file_ipfix} not writable" unless File.writable?(cache_save_file_ipfix)
        @ipfix_templates_cache = load_templates_cache("#{@cache_save_path}/ipfix_templates.cache")
        @ipfix_templates_cache.each{ |key, fields| @ipfix_templates[key, @cache_ttl] = BinData::Struct.new(:endian => :big, :fields => fields) }
      else
        raise "#{self.class.name}: Template cache directory #{cache_save_path} not writable" unless File.writable?(cache_save_path)
        @ipfix_templates_cache = {}
      end
    end
  end
end