Class: BinData::NdrArrayArgProcessor

Inherits:
ArrayArgProcessor
  • Object
show all
Defined in:
lib/ruby_smb/dcerpc/ndr.rb

Overview

This ArgProcessor needs to inherit from BinData::ArrayArgProcessor to make sure the ArrayArgProcessor sanitize_parameters! is called. This will perform proper Array-related sanity checks on the given parameters.

Instance Method Summary collapse

Instance Method Details

#sanitize_parameters!(obj_class, params) ⇒ Object

Raises:

  • (ArgumentError) 


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# File 'lib/ruby_smb/dcerpc/ndr.rb', line 390

def sanitize_parameters!(obj_class, params)
  res = super

  type_class = params[:type]
  # Let the BinData::Array sanitization routine deal with "no type provided"
  return res unless type_class

  type_class, type_params  = params[:type] if type_class.is_a?(Array)
  if type_class.has_parameter?(:byte_align)
    # According to NDR alignemnt rules for arrays: Array alignment is the
    # largest alignment of the array element type and the size information
    # type, if any.
    # So, here, we pick the greatest value between the size of the `size
    # information` field (:max_count or :offset/:actual_count), which is 4
    # bytes for 32-bit NDR, and the element type size
    byte_align = type_class.instance_variable_get(:@obj_params)[:byte_align]
    if obj_class < NdrFixArray
      # Fixed size arrays doesn't have size information
      params[:byte_align] = byte_align
    else
      params[:byte_align] = [4, byte_align].max
    end
    return res
  elsif type_params&.key?(:byte_align)
    return res
  end

  raise ArgumentError.new(
    "NDR Arrays must only include elements with the `:byte_align` "\
    "parameter set. This makes sure the whole structure is correctly "\
    "aligned. Use a predefined NDR element instead, or provide the "\
    "`:byte_align` parameter in `:type` (Faulty element type: #{params[:type]})"
  )
end