mirror of https://github.com/morpheus65535/bazarr
106 lines
3.7 KiB
Python
106 lines
3.7 KiB
Python
# 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.rdata
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from dns._compat import xrange
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_proto_tcp = socket.getprotobyname('tcp')
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_proto_udp = socket.getprotobyname('udp')
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class WKS(dns.rdata.Rdata):
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"""WKS record
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@ivar address: the address
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@type address: string
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@ivar protocol: the protocol
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@type protocol: int
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@ivar bitmap: the bitmap
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@type bitmap: string
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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(WKS, self).__init__(rdclass, rdtype)
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self.address = address
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self.protocol = protocol
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if not isinstance(bitmap, bytearray):
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self.bitmap = bytearray(bitmap)
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else:
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self.bitmap = 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 in xrange(0, len(self.bitmap)):
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byte = self.bitmap[i]
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for j in xrange(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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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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while 1:
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token = tok.get().unescape()
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if token.is_eol_or_eof():
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break
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if token.value.isdigit():
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serv = int(token.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(token.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 j in xrange(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):
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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(cls, rdclass, rdtype, wire, current, rdlen, origin=None):
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address = dns.ipv4.inet_ntoa(wire[current: current + 4])
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protocol, = struct.unpack('!B', wire[current + 4: current + 5])
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current += 5
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rdlen -= 5
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bitmap = wire[current: current + rdlen].unwrap()
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return cls(rdclass, rdtype, address, protocol, bitmap)
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