Class: Nessus::Host

Inherits:
Object
  • Object
show all
Defined in:
lib/nessus/host.rb

Overview

This class represents each of the /NessusClientData_v2/Report/ReportHost elements in the Nessus XML document.

It provides a convenient way to access the information scattered all over the XML in attributes and nested tags.

Instead of providing separate methods for each supported property we rely on Ruby’s #method_missing to do most of the work.

Instance Method Summary collapse

Constructor Details

#initialize(xml_node) ⇒ Host

Accepts an XML node from Nokogiri::XML.



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# File 'lib/nessus/host.rb', line 12

def initialize(xml_node)
  @xml = xml_node
end

Dynamic Method Handling

This class handles dynamic methods through the method_missing method

#method_missing(method, *args) ⇒ Object

This method is invoked by Ruby when a method that is not defined in this instance is called.

In our case we inspect the @method@ parameter and try to find the corresponding <tag/> element inside the ./HostProperties child.



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# File 'lib/nessus/host.rb', line 47

def method_missing(method, *args)
  # We could remove this check and return nil for any non-recognized tag.
  # The problem would be that it would make tricky to debug problems with
  # typos. For instance: <>.potr would return nil instead of raising an
  # exception
  unless supported_tags.include?(method)
    super
    return
  end

  # first we try the attributes: name
  translations_table = {}
  method_name = translations_table.fetch(method, method.to_s)
  return @xml.attributes[method_name].value if @xml.attributes.key?(method_name)


  # translation of Host properties
  translations_table = {
    ip:               'host-ip',
    fqdn:             'host-fqdn',
    operating_system: 'operating-system',
    mac_address:      'mac-address',
    netbios_name:     'netbios-name',
    scan_start_time:  'HOST_START',
    scan_stop_time:   'HOST_END'
  }
  method_name = translations_table.fetch(method, method.to_s)

  if property = @xml.at_xpath("./HostProperties/tag[@name='#{method_name}']")
    return property.text
  else
    return nil
  end
end

Instance Method Details

#report_items ⇒ Object

Each of the entries associated with this host. Returns an array of Nessus::ReportItem objects



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# File 'lib/nessus/host.rb', line 31

def report_items
  @xml.xpath('./ReportItem').collect { |xml_report_item| ReportItem.new(xml_report_item) }
end

#respond_to?(method, include_private = false) ⇒ Boolean

This allows external callers (and specs) to check for implemented properties

Returns:

  • (Boolean) 


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# File 'lib/nessus/host.rb', line 37

def respond_to?(method, include_private=false)
  return true if supported_tags.include?(method.to_sym)
  super
end

#supported_tags ⇒ Object

List of supported tags. They are all desdendents of the ./HostProperties node.



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# File 'lib/nessus/host.rb', line 18

def supported_tags
  [
    # attributes
    :name,

    # simple tags
    :ip, :fqdn, :operating_system, :mac_address, :netbios_name,
    :scan_start_time, :scan_stop_time
  ]
end