lib/ruby_smb/dcerpc/uuid.rb
module RubySMB
module Dcerpc
# [Universal Unique Identifier](http://pubs.opengroup.org/onlinepubs/9629399/apdxa.htm)
class Uuid < BinData::Primitive
default_parameter byte_align: 4
endian :little
uint32 :time_low, label: 'Low field of the timestamp'
uint16 :time_mid, label: 'Middle field of the timestamp'
uint16 :time_hi_and_version, label: 'High field of the timestamp multiplexed with the version number'
uint8 :clock_seq_hi_and_reserved, label: 'High field of the clock sequence multiplexed with the variant'
uint8 :clock_seq_low, label: 'Low field of the clock sequence'
array :node, label: 'Spatially unique node identifier', :type => :uint8, initial_length: 6
def get
"#{to_string_le(time_low.to_binary_s)}"\
"-#{to_string_le(time_mid.to_binary_s)}"\
"-#{to_string_le(time_hi_and_version.to_binary_s)}"\
"-#{clock_seq_hi_and_reserved.to_hex}#{clock_seq_low.to_hex}"\
"-#{node.to_hex}"
end
def set(uuid_string)
uuid_string = uuid_string.delete_suffix('}')
uuid_string = uuid_string.delete_prefix('{')
components = uuid_string.split('-')
self.time_low.read(to_binary_le(components[0]))
self.time_mid.read(to_binary_le(components[1]))
self.time_hi_and_version.read(to_binary_le(components[2]))
self.clock_seq_hi_and_reserved.read(components[3][0,2].hex.chr)
self.clock_seq_low.read(components[3][2,2].hex.chr)
self.node.read(components[4].gsub(/../) {|e| e.hex.chr})
end
private
def to_binary_le(str)
str.scan(/../).map {|char| char.hex.chr}.reverse.join
end
def to_string_le(bin)
bin.each_byte.map {|byte| byte.to_s(16).rjust(2, '0')}.reverse.join
end
end
end
end