mirror of https://github.com/morpheus65535/bazarr
152 lines
5.0 KiB
Python
152 lines
5.0 KiB
Python
# Copyright (C) Dnspython Contributors, see LICENSE for text of ISC license
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# Copyright (C) 2003-2017 Nominum, Inc.
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#
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# Permission to use, copy, modify, and distribute this software and its
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# documentation for any purpose with or without fee is hereby granted,
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# provided that the above copyright notice and this permission notice
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# appear in all copies.
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#
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# THE SOFTWARE IS PROVIDED "AS IS" AND NOMINUM DISCLAIMS ALL WARRANTIES
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# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NOMINUM BE LIABLE FOR
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# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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# WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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# ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
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# OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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import binascii
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import codecs
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import struct
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import dns.exception
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import dns.immutable
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import dns.ipv4
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import dns.ipv6
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import dns.rdata
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import dns.tokenizer
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@dns.immutable.immutable
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class APLItem:
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"""An APL list item."""
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__slots__ = ['family', 'negation', 'address', 'prefix']
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def __init__(self, family, negation, address, prefix):
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self.family = dns.rdata.Rdata._as_uint16(family)
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self.negation = dns.rdata.Rdata._as_bool(negation)
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if self.family == 1:
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self.address = dns.rdata.Rdata._as_ipv4_address(address)
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self.prefix = dns.rdata.Rdata._as_int(prefix, 0, 32)
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elif self.family == 2:
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self.address = dns.rdata.Rdata._as_ipv6_address(address)
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self.prefix = dns.rdata.Rdata._as_int(prefix, 0, 128)
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else:
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self.address = dns.rdata.Rdata._as_bytes(address, max_length=127)
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self.prefix = dns.rdata.Rdata._as_uint8(prefix)
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def __str__(self):
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if self.negation:
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return "!%d:%s/%s" % (self.family, self.address, self.prefix)
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else:
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return "%d:%s/%s" % (self.family, self.address, self.prefix)
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def to_wire(self, file):
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if self.family == 1:
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address = dns.ipv4.inet_aton(self.address)
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elif self.family == 2:
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address = dns.ipv6.inet_aton(self.address)
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else:
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address = binascii.unhexlify(self.address)
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#
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# Truncate least significant zero bytes.
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#
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last = 0
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for i in range(len(address) - 1, -1, -1):
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if address[i] != 0:
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last = i + 1
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break
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address = address[0: last]
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l = len(address)
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assert l < 128
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if self.negation:
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l |= 0x80
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header = struct.pack('!HBB', self.family, self.prefix, l)
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file.write(header)
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file.write(address)
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@dns.immutable.immutable
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class APL(dns.rdata.Rdata):
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"""APL record."""
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# see: RFC 3123
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__slots__ = ['items']
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def __init__(self, rdclass, rdtype, items):
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super().__init__(rdclass, rdtype)
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for item in items:
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if not isinstance(item, APLItem):
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raise ValueError('item not an APLItem')
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self.items = tuple(items)
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def to_text(self, origin=None, relativize=True, **kw):
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return ' '.join(map(str, self.items))
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@classmethod
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def from_text(cls, rdclass, rdtype, tok, origin=None, relativize=True,
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relativize_to=None):
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items = []
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for token in tok.get_remaining():
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item = token.unescape().value
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if item[0] == '!':
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negation = True
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item = item[1:]
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else:
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negation = False
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(family, rest) = item.split(':', 1)
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family = int(family)
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(address, prefix) = rest.split('/', 1)
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prefix = int(prefix)
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item = APLItem(family, negation, address, prefix)
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items.append(item)
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return cls(rdclass, rdtype, items)
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def _to_wire(self, file, compress=None, origin=None, canonicalize=False):
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for item in self.items:
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item.to_wire(file)
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@classmethod
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def from_wire_parser(cls, rdclass, rdtype, parser, origin=None):
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items = []
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while parser.remaining() > 0:
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header = parser.get_struct('!HBB')
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afdlen = header[2]
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if afdlen > 127:
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negation = True
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afdlen -= 128
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else:
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negation = False
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address = parser.get_bytes(afdlen)
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l = len(address)
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if header[0] == 1:
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if l < 4:
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address += b'\x00' * (4 - l)
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elif header[0] == 2:
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if l < 16:
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address += b'\x00' * (16 - l)
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else:
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#
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# This isn't really right according to the RFC, but it
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# seems better than throwing an exception
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#
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address = codecs.encode(address, 'hex_codec')
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item = APLItem(header[0], negation, address, header[1])
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items.append(item)
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return cls(rdclass, rdtype, items)
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