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module Net # :nodoc:
module DNS
class RR
# This is an auxiliary class to handle RR type field in a DNS packet.
class Types
TYPES = {
'SIGZERO' => 0, # RFC2931 consider this a pseudo type
'A' => 1, # RFC 1035, Section 3.4.1
'NS' => 2, # RFC 1035, Section 3.3.11
'MD' => 3, # RFC 1035, Section 3.3.4 (obsolete)
'MF' => 4, # RFC 1035, Section 3.3.5 (obsolete)
'CNAME' => 5, # RFC 1035, Section 3.3.1
'SOA' => 6, # RFC 1035, Section 3.3.13
'MB' => 7, # RFC 1035, Section 3.3.3
'MG' => 8, # RFC 1035, Section 3.3.6
'MR' => 9, # RFC 1035, Section 3.3.8
'NULL' => 10, # RFC 1035, Section 3.3.10
'WKS' => 11, # RFC 1035, Section 3.4.2 (deprecated)
'PTR' => 12, # RFC 1035, Section 3.3.12
'HINFO' => 13, # RFC 1035, Section 3.3.2
'MINFO' => 14, # RFC 1035, Section 3.3.7
'MX' => 15, # RFC 1035, Section 3.3.9
'TXT' => 16, # RFC 1035, Section 3.3.14
'RP' => 17, # RFC 1183, Section 2.2
'AFSDB' => 18, # RFC 1183, Section 1
'X25' => 19, # RFC 1183, Section 3.1
'ISDN' => 20, # RFC 1183, Section 3.2
'RT' => 21, # RFC 1183, Section 3.3
'NSAP' => 22, # RFC 1706, Section 5
'NSAP_PTR' => 23, # RFC 1348 (obsolete)
# The following 2 RRs are impemented in Net::DNS::SEC, TODO
'SIG' => 24, # RFC 2535, Section 4.1
'KEY' => 25, # RFC 2535, Section 3.1
'PX' => 26, # RFC 2163,
'GPOS' => 27, # RFC 1712 (obsolete)
'AAAA' => 28, # RFC 1886, Section 2.1
'LOC' => 29, # RFC 1876
# The following RR is implemented in Net::DNS::SEC, TODO
'NXT' => 30, # RFC 2535, Section 5.2
'EID' => 31, # draft-ietf-nimrod-dns-xx.txt
'NIMLOC' => 32, # draft-ietf-nimrod-dns-xx.txt
'SRV' => 33, # RFC 2052
'ATMA' => 34, # ???
'NAPTR' => 35, # RFC 2168
'KX' => 36, # RFC 2230
'CERT' => 37, # RFC 2538
'DNAME' => 39, # RFC 2672
'OPT' => 41, # RFC 2671
# The following 4 RRs are implemented in Net::DNS::SEC TODO
'DS' => 43, # draft-ietf-dnsext-delegation-signer
'SSHFP' => 44, # draft-ietf-secsh-dns (No RFC # yet at time of coding)
'RRSIG' => 46, # draft-ietf-dnsext-dnssec-2535typecode-change
'NSEC' => 47, # draft-ietf-dnsext-dnssec-2535typecode-change
'DNSKEY' => 48, # draft-ietf-dnsext-dnssec-2535typecode-change
'UINFO' => 100, # non-standard
'UID' => 101, # non-standard
'GID' => 102, # non-standard
'UNSPEC' => 103, # non-standard
'TKEY' => 249, # RFC 2930
'TSIG' => 250, # RFC 2931
'IXFR' => 251, # RFC 1995
'AXFR' => 252, # RFC 1035
'MAILB' => 253, # RFC 1035 (MB, MG, MR)
'MAILA' => 254, # RFC 1035 (obsolete - see MX)
'ANY' => 255, # RFC 1035
}.freeze
# The default value when type is nil in Resource Records
@@default = TYPES["A"]
def self.default
@@default
end
# Be able to control the default type to assign when
# type is +nil+. Default to +A+
def self.default=(str)
if TYPES.key? str
@@default = TYPES[str]
else
raise ArgumentError, "Unknown type #{str}"
end
end
# Checks whether +type+ is a valid RR type.
def self.valid?(type)
case type
when String
TYPES.key?(type)
when Integer
TYPES.invert.key?(type)
else
raise ArgumentError, "Wrong type class: #{type.class}"
end
end
# Returns the type in string format, as "A" or "NS",
# given the numeric value
def self.to_str(type)
case type
when Integer
if TYPES.invert.key? type
TYPES.invert[type]
else
raise ArgumentError, "Unknown type number #{type}"
end
else
raise ArgumentError, "Wrong type class: #{type.class}"
end
end
# Gives in output the keys from the +Types+ hash
# in a format suited for regexps
def self.regexp
# Longest ones go first, so the regex engine will match AAAA before A.
TYPES.keys.sort { |a, b| b.length <=> a.length }.join("|")
end
# Creates a new object representing an RR type. Performs some
# checks on the argument validity too. Il +type+ is +nil+, the
# default value is +ANY+ or the one set with Types.default=
def initialize(type)
case type
when String
# type in the form "A" or "NS"
new_from_string(type.upcase)
when Integer
# type in numeric form
new_from_num(type)
when nil
# default type, control with Types.default=
@str = TYPES.invert[@@default]
@num = @@default
else
raise ArgumentError, "Wrong type class: #{type.class}"
end
end
# Returns the type in number format
# (default for normal use)
def inspect
@num
end
# Returns the type in string format,
# i.d. "A" or "NS" or such a string.
def to_s
@str
end
# Returns the type in numeric format,
# usable by the pack methods for data transfers
def to_i
@num.to_i
end
def to_str
@num.to_s
end
private
# Constructor for string data type.
def new_from_string(type)
case type
when /^TYPE\\d+/
# TODO!!!
else
# String with name of type
if TYPES.key? type
@str = type
@num = TYPES[type]
else
raise ArgumentError, "Unknown type #{type}"
end
end
end
# Contructor for numeric data type.
def new_from_num(type)
if TYPES.invert.key? type
@num = type
@str = TYPES.invert[type]
else
raise ArgumentError, "Unkown type number #{type}"
end
end
end
end
end
end
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