1# Copyright (C) 2003-2007, 2009-2011 Nominum, Inc. 2# 3# Permission to use, copy, modify, and distribute this software and its 4# documentation for any purpose with or without fee is hereby granted, 5# provided that the above copyright notice and this permission notice 6# appear in all copies. 7# 8# THE SOFTWARE IS PROVIDED "AS IS" AND NOMINUM DISCLAIMS ALL WARRANTIES 9# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 10# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NOMINUM BE LIABLE FOR 11# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 12# WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 13# ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT 14# OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 15 16import binascii 17 18import dns.exception 19import dns.rdata 20import dns.tokenizer 21 22 23class NSAP(dns.rdata.Rdata): 24 25 """NSAP record. 26 27 @ivar address: a NASP 28 @type address: string 29 @see: RFC 1706""" 30 31 __slots__ = ['address'] 32 33 def __init__(self, rdclass, rdtype, address): 34 super(NSAP, self).__init__(rdclass, rdtype) 35 self.address = address 36 37 def to_text(self, origin=None, relativize=True, **kw): 38 return "0x%s" % binascii.hexlify(self.address).decode() 39 40 @classmethod 41 def from_text(cls, rdclass, rdtype, tok, origin=None, relativize=True): 42 address = tok.get_string() 43 tok.get_eol() 44 if address[0:2] != '0x': 45 raise dns.exception.SyntaxError('string does not start with 0x') 46 address = address[2:].replace('.', '') 47 if len(address) % 2 != 0: 48 raise dns.exception.SyntaxError('hexstring has odd length') 49 address = binascii.unhexlify(address.encode()) 50 return cls(rdclass, rdtype, address) 51 52 def to_wire(self, file, compress=None, origin=None): 53 file.write(self.address) 54 55 @classmethod 56 def from_wire(cls, rdclass, rdtype, wire, current, rdlen, origin=None): 57 address = wire[current: current + rdlen].unwrap() 58 return cls(rdclass, rdtype, address) 59