--- /dev/null
+# Copyright (C) 2004-2007, 2009-2011, 2016 Nominum, Inc.
+#
+# Permission to use, copy, modify, and distribute this software and its
+# documentation for any purpose with or without fee is hereby granted,
+# provided that the above copyright notice and this permission notice
+# appear in all copies.
+#
+# THE SOFTWARE IS PROVIDED "AS IS" AND NOMINUM DISCLAIMS ALL WARRANTIES
+# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NOMINUM BE LIABLE FOR
+# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+# WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+# ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
+# OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+
+import struct
+
+import dns.exception
+import dns.rdata
+import dns.rdatatype
+import dns.name
+from dns._compat import xrange
+
+class CSYNC(dns.rdata.Rdata):
+
+ """CSYNC record
+
+ @ivar serial: the SOA serial number
+ @type serial: int
+ @ivar flags: the CSYNC flags
+ @type flags: int
+ @ivar windows: the windowed bitmap list
+ @type windows: list of (window number, string) tuples"""
+
+ __slots__ = ['serial', 'flags', 'windows']
+
+ def __init__(self, rdclass, rdtype, serial, flags, windows):
+ super(CSYNC, self).__init__(rdclass, rdtype)
+ self.serial = serial
+ self.flags = flags
+ self.windows = windows
+
+ def to_text(self, origin=None, relativize=True, **kw):
+ text = ''
+ for (window, bitmap) in self.windows:
+ bits = []
+ for i in xrange(0, len(bitmap)):
+ byte = bitmap[i]
+ for j in xrange(0, 8):
+ if byte & (0x80 >> j):
+ bits.append(dns.rdatatype.to_text(window * 256 +
+ i * 8 + j))
+ text += (' ' + ' '.join(bits))
+ return '%d %d%s' % (self.serial, self.flags, text)
+
+ @classmethod
+ def from_text(cls, rdclass, rdtype, tok, origin=None, relativize=True):
+ serial = tok.get_uint32()
+ flags = tok.get_uint16()
+ rdtypes = []
+ while 1:
+ token = tok.get().unescape()
+ if token.is_eol_or_eof():
+ break
+ nrdtype = dns.rdatatype.from_text(token.value)
+ if nrdtype == 0:
+ raise dns.exception.SyntaxError("CSYNC with bit 0")
+ if nrdtype > 65535:
+ raise dns.exception.SyntaxError("CSYNC with bit > 65535")
+ rdtypes.append(nrdtype)
+ rdtypes.sort()
+ window = 0
+ octets = 0
+ prior_rdtype = 0
+ bitmap = bytearray(b'\0' * 32)
+ windows = []
+ for nrdtype in rdtypes:
+ if nrdtype == prior_rdtype:
+ continue
+ prior_rdtype = nrdtype
+ new_window = nrdtype // 256
+ if new_window != window:
+ windows.append((window, bitmap[0:octets]))
+ bitmap = bytearray(b'\0' * 32)
+ window = new_window
+ offset = nrdtype % 256
+ byte = offset // 8
+ bit = offset % 8
+ octets = byte + 1
+ bitmap[byte] = bitmap[byte] | (0x80 >> bit)
+
+ windows.append((window, bitmap[0:octets]))
+ return cls(rdclass, rdtype, serial, flags, windows)
+
+ def to_wire(self, file, compress=None, origin=None):
+ file.write(struct.pack('!IH', self.serial, self.flags))
+ for (window, bitmap) in self.windows:
+ file.write(struct.pack('!BB', window, len(bitmap)))
+ file.write(bitmap)
+
+ @classmethod
+ def from_wire(cls, rdclass, rdtype, wire, current, rdlen, origin=None):
+ if rdlen < 6:
+ raise dns.exception.FormError("CSYNC too short")
+ (serial, flags) = struct.unpack("!IH", wire[current: current + 6])
+ current += 6
+ rdlen -= 6
+ windows = []
+ while rdlen > 0:
+ if rdlen < 3:
+ raise dns.exception.FormError("CSYNC too short")
+ window = wire[current]
+ octets = wire[current + 1]
+ if octets == 0 or octets > 32:
+ raise dns.exception.FormError("bad CSYNC octets")
+ current += 2
+ rdlen -= 2
+ if rdlen < octets:
+ raise dns.exception.FormError("bad CSYNC bitmap length")
+ bitmap = bytearray(wire[current: current + octets].unwrap())
+ current += octets
+ rdlen -= octets
+ windows.append((window, bitmap))
+ return cls(rdclass, rdtype, serial, flags, windows)
projects / thirdparty / dnspython.git / commitdiff
