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#--
#Copyright 2007 Nominet UK
#
#Licensed under the Apache License, Version 2.0 (the "License");
#you may not use this file except in compliance with the License.
#You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
#Unless required by applicable law or agreed to in writing, software
#distributed under the License is distributed on an "AS IS" BASIS,
#WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
#See the License for the specific language governing permissions and
#limitations under the License.
#++
module Dnsruby
class RR
#Class for DNS Network Service Access Point (NSAP) resource records.
#RFC 1706.
class NSAP < RR
ClassValue = nil #:nodoc: all
TypeValue= Types::NSAP #:nodoc: all
#The RR's authority and format identifier. Dnsruby
#currently supports only AFI 47 (GOSIP Version 2).
attr_accessor :afi
#The RR's initial domain identifier.
attr_accessor :idi
#The RR's DSP format identifier.
attr_accessor :dfi
#The RR's administrative authority.
attr_accessor :aa
#The RR's routing domain identifier.
attr_accessor :rd
#The RR's area identifier.
attr_accessor :area
#The RR's system identifier.
attr_accessor :id
#The RR's NSAP selector.
attr_accessor :sel
#The RR's reserved field.
attr_writer :rsvd
#The RR's initial domain part (the AFI and IDI fields).
def idp
ret = [@afi, @idi].join('')
return ret
end
#The RR's domain specific part (the DFI, AA, Rsvd, RD, Area,
#ID, and SEL fields).
def dsp
ret = [@dfi,@aa,rsvd,@rd,@area,@id,@sel].join('')
return ret
end
def rsvd
if (@rsvd==nil)
return "0000"
else
return @rsvd
end
end
#------------------------------------------------------------------------------
# Usage: str2bcd(STRING, NUM_BYTES)
#
# Takes a string representing a hex number of arbitrary length and
# returns an equivalent BCD string of NUM_BYTES length (with
# NUM_BYTES * 2 digits), adding leading zeros if necessary.
#------------------------------------------------------------------------------
def str2bcd(s, bytes)
retval = "";
digits = bytes * 2;
string = sprintf("%#{digits}s", s);
string.tr!(" ","0");
i=0;
bytes.times do
bcd = string[i*2, 2];
retval += [bcd.to_i(16)].pack("C");
i+=1
end
return retval;
end
def from_data(data) #:nodoc: all
@afi, @idi, @dfi, @aa, @rsvd, @rd, @area, @id, @sel = data
end
def from_string(s) #:nodoc: all
if (s)
string = s.gsub(/\./, ""); # remove all dots.
string.gsub!(/^0x/,""); # remove leading 0x
if (string =~ /^[a-zA-Z0-9]{40}$/)
(@afi, @idi, @dfi, @aa, @rsvd, @rd, @area, @id, @sel) = string.unpack("A2A4A2A6A4A4A4A12A2")
end
end
end
def rdata_to_string #:nodoc: all
rdatastr=""
if (defined?@afi)
if (@afi == "47")
rdatastr = [idp, dsp].join('')
else
rdatastr = "; AFI #{@afi} not supported"
end
else
rdatastr = ''
end
return rdatastr
end
def encode_rdata(msg, canonical=false) #:nodoc: all
if (defined?@afi)
msg.put_pack("C", @afi.to_i(16))
if (@afi == "47")
msg.put_bytes(str2bcd(@idi, 2))
msg.put_bytes(str2bcd(@dfi, 1))
msg.put_bytes(str2bcd(@aa, 3))
msg.put_bytes(str2bcd(0, 2)) # rsvd)
msg.put_bytes(str2bcd(@rd, 2))
msg.put_bytes(str2bcd(@area, 2))
msg.put_bytes(str2bcd(@id, 6))
msg.put_bytes(str2bcd(@sel, 1))
end
# Checks for other versions would go here.
end
return rdata
end
def self.decode_rdata(msg) #:nodoc: all
afi = msg.get_unpack("C")[0]
afi = sprintf("%02x", afi)
if (afi == "47")
idi = msg.get_unpack("CC")
dfi = msg.get_unpack("C")[0]
aa = msg.get_unpack("CCC")
rsvd = msg.get_unpack("CC")
rd = msg.get_unpack("CC")
area = msg.get_unpack("CC")
id = msg.get_unpack("CCCCCC")
sel = msg.get_unpack("C")[0]
idi = sprintf("%02x%02x", idi[0], idi[1])
dfi = sprintf("%02x", dfi)
aa = sprintf("%02x%02x%02x", aa[0], aa[1], aa[2])
rsvd = sprintf("%02x%02x", rsvd[0],rsvd[1])
rd = sprintf("%02x%02x", rd[0],rd[1])
area = sprintf("%02x%02x", area[0],area[1])
id = sprintf("%02x%02x%02x%02x%02x%02x", id[0],id[1],id[2],id[3],id[4],id[5])
sel = sprintf("%02x", sel)
else
# What to do for unsupported versions?
end
return self.new([afi, idi, dfi, aa, rsvd, rd, area, id, sel])
end
end
end
end
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