Module: RubySMB::Dcerpc::Ndr::VarStringPlugin

Defined in:
lib/ruby_smb/dcerpc/ndr.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Instance Attribute Details

#actual_count ⇒ Object

Returns the value of attribute actual_count.



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# File 'lib/ruby_smb/dcerpc/ndr.rb', line 587

def actual_count
  @actual_count
end

#offset ⇒ Object

Returns the value of attribute offset.



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# File 'lib/ruby_smb/dcerpc/ndr.rb', line 587

def offset
  @offset
end

Instance Method Details

#assign(val) ⇒ Object 



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# File 'lib/ruby_smb/dcerpc/ndr.rb', line 616

def assign(val)
  update_actual_count(val)
  super
end

#do_num_bytes ⇒ Object 



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# File 'lib/ruby_smb/dcerpc/ndr.rb', line 621

def do_num_bytes
  @actual_count > 0 ? (8 + super) : 8
end

#do_read(io) ⇒ Object 



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# File 'lib/ruby_smb/dcerpc/ndr.rb', line 604

def do_read(io)
  @offset = io.readbytes(4).unpack('L<').first
   BinData.trace_message do |tracer|
    tracer.trace_obj("#{debug_name}.offset", @offset.to_s)
  end
  @actual_count = io.readbytes(4).unpack('L<').first
  BinData.trace_message do |tracer|
    tracer.trace_obj("#{debug_name}.actual_count", @actual_count.to_s)
  end
  super if @actual_count > 0
end

#do_write(io) ⇒ Object 



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# File 'lib/ruby_smb/dcerpc/ndr.rb', line 598

def do_write(io)
  io.writebytes([@offset].pack('L<'))
  io.writebytes([@actual_count].pack('L<'))
  super if @actual_count > 0
end

#initialize_instance ⇒ Object 



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# File 'lib/ruby_smb/dcerpc/ndr.rb', line 589

def initialize_instance
  @offset = 0
  @actual_count = 0
  if has_parameter?(:initial_value)
    update_actual_count(eval_parameter(:initial_value))
  end
  super
end

#update_actual_count(val) ⇒ Object 



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# File 'lib/ruby_smb/dcerpc/ndr.rb', line 625

def update_actual_count(val)
  if is_a?(BinData::Stringz)
    @actual_count = val.to_s.strip.length
    # Add one to count the terminator. According to
    # https://pubs.opengroup.org/onlinepubs/9629399/chap14.htm#tagcjh_19_03_04,
    # the NDR String must contain at least one element, the terminator. So,
    # add one even if it is an empty string.
    @actual_count += 1
  else
    @actual_count = val.to_s.length
  end
end