Class: Nexpose::APIRequest

Inherits:
Object
  • Object
show all
Includes:
XMLUtils
Defined in:
lib/nexpose/api_request.rb

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Methods included from XMLUtils

#make_xml, #parse_xml, success?

Constructor Details

#initialize(req, url, api_version = '1.1') ⇒ APIRequest

Returns a new instance of APIRequest.



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# File 'lib/nexpose/api_request.rb', line 20

def initialize(req, url, api_version = '1.1')
  @url = url
  @req = req
  @api_version = api_version
  @url = @url.sub('API_VERSION', @api_version)
  prepare_http_client
end

Instance Attribute Details

#error ⇒ Object (readonly)

Returns the value of attribute error.



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# File 'lib/nexpose/api_request.rb', line 14

def error
  @error
end

#headers ⇒ Object (readonly)

Returns the value of attribute headers.



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# File 'lib/nexpose/api_request.rb', line 7

def headers
  @headers
end

#http ⇒ Object (readonly)

Returns the value of attribute http.



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# File 'lib/nexpose/api_request.rb', line 5

def http
  @http
end

#raw_response ⇒ Object (readonly)

Returns the value of attribute raw_response.



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# File 'lib/nexpose/api_request.rb', line 17

def raw_response
  @raw_response
end

#raw_response_data ⇒ Object (readonly)

Returns the value of attribute raw_response_data.



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# File 'lib/nexpose/api_request.rb', line 18

def raw_response_data
  @raw_response_data
end

#req ⇒ Object (readonly)

Returns the value of attribute req.



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# File 'lib/nexpose/api_request.rb', line 9

def req
  @req
end

#res ⇒ Object (readonly)

Returns the value of attribute res.



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# File 'lib/nexpose/api_request.rb', line 10

def res
  @res
end

#sid ⇒ Object (readonly)

Returns the value of attribute sid.



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# File 'lib/nexpose/api_request.rb', line 11

def sid
  @sid
end

#success ⇒ Object (readonly)

Returns the value of attribute success.



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# File 'lib/nexpose/api_request.rb', line 12

def success
  @success
end

#trace ⇒ Object (readonly)

Returns the value of attribute trace.



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# File 'lib/nexpose/api_request.rb', line 15

def trace
  @trace
end

#uri ⇒ Object (readonly)

Returns the value of attribute uri.



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# File 'lib/nexpose/api_request.rb', line 6

def uri
  @uri
end

Class Method Details

.execute(url, req, api_version = '1.1', options = {}) ⇒ Object

Raises:



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# File 'lib/nexpose/api_request.rb', line 136

def self.execute(url, req, api_version='1.1', options = {})
  obj = self.new(req.to_s, url, api_version)
  obj.execute(options)
  raise APIError.new(obj, "Action failed: #{obj.error}") unless obj.success
  obj
end

Instance Method Details

#attributes(*args) ⇒ Object 



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# File 'lib/nexpose/api_request.rb', line 131

def attributes(*args)
  return if not @res.root
  @res.root.attributes(*args)
end

#execute(options = {}) ⇒ Object 



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# File 'lib/nexpose/api_request.rb', line 42

def execute(options = {})
  @conn_tries = 0

  begin
    prepare_http_client
    @http.read_timeout = options[:timeout] if options.key? :timeout
    @raw_response = @http.post(@uri.path, @req, @headers)
    @raw_response_data = @raw_response.read_body

    # Allow the :raw keyword to bypass XML parsing.
    if options[:raw]
      if raw_response_data =~ /success="1"/
        @success = true
      else
        @success = false
        @error = "User requested raw XML response. Not parsing failures."
      end
    else
      @res = parse_xml(@raw_response_data)

      unless @res.root
        @error = 'Nexpose service returned invalid XML.'
        return @sid
      end

      @sid = attributes['session-id']

      if (attributes['success'] and attributes['success'].to_i == 1)
        @success = true
      elsif @api_version =~ /1.2/ and @res and (@res.get_elements '//Exception').count < 1
        @success = true
      else
        @success = false
        if @api_version =~ /1.2/
          @res.elements.each('//Exception/Message') do |message|
          @error = message.text.sub(/.*Exception: */, '')
          end
        @res.elements.each('//Exception/Stacktrace') do |stacktrace|
          @trace = stacktrace.text
        end
        else
          @res.elements.each('//message') do |message|
            @error = message.text.sub(/.*Exception: */, '')
          end
          @res.elements.each('//stacktrace') do |stacktrace|
            @trace = stacktrace.text
          end
        end
      end
    end
    # This is a hack to handle corner cases where a heavily loaded Nexpose instance
    # drops our HTTP connection before processing. We try 5 times to establish a
    # connection in these situations. The actual exception occurs in the Ruby
    # http library, which is why we use such generic error classes.
  rescue OpenSSL::SSL::SSLError
    if @conn_tries < 5
      @conn_tries += 1
      retry
    end
  rescue ::ArgumentError, ::NoMethodError => e
    if @conn_tries < 5
      @conn_tries += 1
      retry
    end
  rescue ::Timeout::Error
    if @conn_tries < 5
      @conn_tries += 1
      # If an explicit timeout is set, don't retry.
      retry unless options.key? :timeout
    end
    @error = "Nexpose did not respond within #{@http.read_timeout} seconds."
  rescue ::Errno::EHOSTUNREACH, ::Errno::ENETDOWN, ::Errno::ENETUNREACH, ::Errno::ENETRESET, ::Errno::EHOSTDOWN, ::Errno::EACCES, ::Errno::EINVAL, ::Errno::EADDRNOTAVAIL
    @error = 'Nexpose host is unreachable.'
    # Handle console-level interrupts
  rescue ::Interrupt
    @error = 'Received a user interrupt.'
  rescue ::Errno::ECONNRESET, ::Errno::ECONNREFUSED, ::Errno::ENOTCONN, ::Errno::ECONNABORTED
    @error = 'Nexpose service is not available.'
  rescue ::REXML::ParseException => exc
    @error = "Error parsing response: #{exc.message}"
  end

  if !(@success or @error)
    @error = "Nexpose service returned an unrecognized response: #{@raw_response_data.inspect}"
  end

  @sid
end

#prepare_http_client ⇒ Object 



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# File 'lib/nexpose/api_request.rb', line 28

def prepare_http_client
  @uri = URI.parse(@url)
  @http = Net::HTTP.new(@uri.host, @uri.port)
  @http.use_ssl = true
  #
  # XXX: This is obviously a security issue, however, we handle this at the client level by forcing
  #      a confirmation when the nexpose host is not localhost. In a perfect world, we would present
  #      the server signature before accepting it, but this requires either a direct callback inside
  #      of this module back to whatever UI, or opens a race condition between accept and attempt.
  @http.verify_mode = OpenSSL::SSL::VERIFY_NONE
  @headers = {'Content-Type' => 'text/xml'}
  @success = false
end