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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 16 import cStringIO 17 import struct 18 19 import dns.exception 20 import dns.inet 21 import dns.rdata 22 import dns.tokenizer 2325 """An APL list item. 26 27 @ivar family: the address family (IANA address family registry) 28 @type family: int 29 @ivar negation: is this item negated? 30 @type negation: bool 31 @ivar address: the address 32 @type address: string 33 @ivar prefix: the prefix length 34 @type prefix: int 35 """ 36 37 __slots__ = ['family', 'negation', 'address', 'prefix'] 387440 self.family = family 41 self.negation = negation 42 self.address = address 43 self.prefix = prefix4446 if self.negation: 47 return "!%d:%s/%s" % (self.family, self.address, self.prefix) 48 else: 49 return "%d:%s/%s" % (self.family, self.address, self.prefix)5052 if self.family == 1: 53 address = dns.inet.inet_pton(dns.inet.AF_INET, self.address) 54 elif self.family == 2: 55 address = dns.inet.inet_pton(dns.inet.AF_INET6, self.address) 56 else: 57 address = self.address.decode('hex_codec') 58 # 59 # Truncate least significant zero bytes. 60 # 61 last = 0 62 for i in xrange(len(address) - 1, -1, -1): 63 if address[i] != chr(0): 64 last = i + 1 65 break 66 address = address[0 : last] 67 l = len(address) 68 assert l < 128 69 if self.negation: 70 l |= 0x80 71 header = struct.pack('!HBB', self.family, self.prefix, l) 72 file.write(header) 73 file.write(address)76 """APL record. 77 78 @ivar items: a list of APL items 79 @type items: list of APL_Item 80 @see: RFC 3123""" 81 82 __slots__ = ['items'] 83 87 9017192 items = [] 93 while 1: 94 token = tok.get().unescape() 95 if token.is_eol_or_eof(): 96 break 97 item = token.value 98 if item[0] == '!': 99 negation = True 100 item = item[1:] 101 else: 102 negation = False 103 (family, rest) = item.split(':', 1) 104 family = int(family) 105 (address, prefix) = rest.split('/', 1) 106 prefix = int(prefix) 107 item = APLItem(family, negation, address, prefix) 108 items.append(item) 109 110 return cls(rdclass, rdtype, items)111 112 from_text = classmethod(from_text) 113 117119 items = [] 120 while 1: 121 if rdlen == 0: 122 break 123 if rdlen < 4: 124 raise dns.exception.FormError 125 header = struct.unpack('!HBB', wire[current : current + 4]) 126 afdlen = header[2] 127 if afdlen > 127: 128 negation = True 129 afdlen -= 128 130 else: 131 negation = False 132 current += 4 133 rdlen -= 4 134 if rdlen < afdlen: 135 raise dns.exception.FormError 136 address = wire[current : current + afdlen].unwrap() 137 l = len(address) 138 if header[0] == 1: 139 if l < 4: 140 address += '\x00' * (4 - l) 141 address = dns.inet.inet_ntop(dns.inet.AF_INET, address) 142 elif header[0] == 2: 143 if l < 16: 144 address += '\x00' * (16 - l) 145 address = dns.inet.inet_ntop(dns.inet.AF_INET6, address) 146 else: 147 # 148 # This isn't really right according to the RFC, but it 149 # seems better than throwing an exception 150 # 151 address = address.encode('hex_codec') 152 current += afdlen 153 rdlen -= afdlen 154 item = APLItem(header[0], negation, address, header[1]) 155 items.append(item) 156 return cls(rdclass, rdtype, items)157 158 from_wire = classmethod(from_wire) 159
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