mirror of https://github.com/morpheus65535/bazarr
100 lines
3.6 KiB
Python
100 lines
3.6 KiB
Python
# Copyright (C) Dnspython Contributors, see LICENSE for text of ISC license
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# Copyright (C) 2003-2007, 2009-2011 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 socket
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import struct
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import dns.ipv4
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import dns.immutable
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import dns.rdata
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try:
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_proto_tcp = socket.getprotobyname('tcp')
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_proto_udp = socket.getprotobyname('udp')
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except OSError:
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# Fall back to defaults in case /etc/protocols is unavailable.
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_proto_tcp = 6
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_proto_udp = 17
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@dns.immutable.immutable
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class WKS(dns.rdata.Rdata):
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"""WKS record"""
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# see: RFC 1035
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__slots__ = ['address', 'protocol', 'bitmap']
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def __init__(self, rdclass, rdtype, address, protocol, bitmap):
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super().__init__(rdclass, rdtype)
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self.address = self._as_ipv4_address(address)
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self.protocol = self._as_uint8(protocol)
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self.bitmap = self._as_bytes(bitmap)
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def to_text(self, origin=None, relativize=True, **kw):
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bits = []
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for i, byte in enumerate(self.bitmap):
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for j in range(0, 8):
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if byte & (0x80 >> j):
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bits.append(str(i * 8 + j))
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text = ' '.join(bits)
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return '%s %d %s' % (self.address, self.protocol, text)
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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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address = tok.get_string()
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protocol = tok.get_string()
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if protocol.isdigit():
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protocol = int(protocol)
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else:
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protocol = socket.getprotobyname(protocol)
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bitmap = bytearray()
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for token in tok.get_remaining():
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value = token.unescape().value
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if value.isdigit():
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serv = int(value)
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else:
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if protocol != _proto_udp and protocol != _proto_tcp:
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raise NotImplementedError("protocol must be TCP or UDP")
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if protocol == _proto_udp:
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protocol_text = "udp"
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else:
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protocol_text = "tcp"
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serv = socket.getservbyname(value, protocol_text)
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i = serv // 8
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l = len(bitmap)
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if l < i + 1:
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for _ in range(l, i + 1):
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bitmap.append(0)
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bitmap[i] = bitmap[i] | (0x80 >> (serv % 8))
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bitmap = dns.rdata._truncate_bitmap(bitmap)
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return cls(rdclass, rdtype, address, protocol, bitmap)
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def _to_wire(self, file, compress=None, origin=None, canonicalize=False):
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file.write(dns.ipv4.inet_aton(self.address))
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protocol = struct.pack('!B', self.protocol)
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file.write(protocol)
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file.write(self.bitmap)
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@classmethod
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def from_wire_parser(cls, rdclass, rdtype, parser, origin=None):
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address = parser.get_bytes(4)
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protocol = parser.get_uint8()
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bitmap = parser.get_remaining()
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return cls(rdclass, rdtype, address, protocol, bitmap)
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