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|
module Net # :nodoc:
module DNS
class RR
#
# = Mail Exchange Record (MX)
#
# Class for DNS MX resource records.
#
# A MX record specifies the name and relative preference of mail servers
# (mail exchangers in the DNS jargon) for the zone.
# The MX RR is used by SMTP (Mail) Agents to route mail for the domain.
#
class MX < RR
# Gets the preference value.
#
# Returns an Integer.
attr_reader :preference
# Gets the exchange value.
#
# Returns a String.
attr_reader :exchange
# Gets the standardized value for this record,
# represented by the value of <tt>preference</tt> and <tt>exchange</tt>.
#
# Returns a String.
def value
"#{preference} #{exchange}"
end
private
def subclass_new_from_hash(options)
if options.key?(:preference) && options.key?(:exchange)
@preference = options[:preference].to_i
@exchange = options[:exchange]
else
raise ArgumentError, ":preference and :exchange fields are mandatory"
end
end
def subclass_new_from_string(str)
@preference, @exchange = check_mx(str)
end
def subclass_new_from_binary(data, offset)
@preference = data.unpack("@#{offset} n")[0]
offset += 2
@exchange, offset = dn_expand(data, offset)
offset
end
def set_type
@type = Net::DNS::RR::Types.new("MX")
end
def get_inspect
value
end
def check_mx(input)
str = input.to_s
unless str.strip =~ /^(\d+)\s+(\S+)$/
raise ArgumentError, "Invalid MX section `#{str}'"
end
[Regexp.last_match(1).to_i, Regexp.last_match(2)]
end
def build_pack
@mx_pack = [@preference].pack("n") + pack_name(@exchange)
@rdlength = @mx_pack.size
end
def get_data
@mx_pack
end
end
end
end
end
|
