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|
module Net # :nodoc:
module DNS
class RR
#
# = System Information Record (HINFO)
#
# Class for DNS HINFO resource records.
#
# Allows definition of the Hardware type and Operating System (OS) in use at a host.
# For security reasons these records are rarely used on public servers.
# If a space exists in the field it must be enclosed in quotes.
# Single space between CPU and OS parameters.
#
class HINFO < RR
# Gets the CPU value.
#
# Returns a String.
attr_reader :cpu
# Gets the OS value.
#
# Returns a String.
attr_reader :os
# Gets the standardized value for this record,
# represented by the value of <tt>cpu</tt> and <tt>os</tt>.
#
# Returns a String.
def value
%Q("#{cpu}" "#{os}")
end
# Gets a list of all the attributes for this record.
#
# Returns an Array of values.
def to_a
[nil, nil, cls.to_s, type.to_s, value]
end
private
def subclass_new_from_hash(options)
if options.key?(:cpu) && options.key?(:os)
@cpu = options[:cpu]
@os = options[:os]
else
raise ArgumentError, ":cpu and :os fields are mandatory"
end
end
def subclass_new_from_string(str)
@cpu, @os = check_hinfo(str)
end
def subclass_new_from_binary(data, offset)
len = data.unpack("@#{offset} C").first
offset += 1
@cpu = data[offset..(offset + len)]
offset += len
len = data.unpack("@#{offset} C").first
offset += 1
@os = data[offset..(offset + len)]
offset += len
end
def set_type
@type = Net::DNS::RR::Types.new("HINFO")
end
def get_inspect
value
end
def check_hinfo(input)
if input.to_s.strip =~ /^(?:["']?(.*?)["']?)\s+(?:["']?(.*?)["']?)$/
[Regexp.last_match(1), Regexp.last_match(2)]
else
raise ArgumentError, "Invalid HINFO Section `#{input}'"
end
end
def build_pack
@hinfo_pack = ""
@hinfo_pack += [cpu.size].pack("C") + cpu
@hinfo_pack += [os.size].pack("C") + os
@rdlength = @hinfo_pack.size
end
def get_data
@hinfo_pack
end
end
end
end
end
|
