s4-python: import a copy of the python dns library

This library is not installed on enough systems for us to rely
on it being available. We use the system copy if possible, and
fallback to this local copy

Pair-Programmed-With: Andrew Bartlett <abartlet@samba.org>

1 files changed, 182 insertions, 0 deletions

diff --git a/source4/scripting/python/samba_external/dnspython/dns/rdtypes/ANY/NSEC3.py b/source4/scripting/python/samba_external/dnspython/dns/rdtypes/ANY/NSEC3.py
new file mode 100644
index 0000000000..932d7b4032
--- /dev/null
+++ b/source4/scripting/python/samba_external/dnspython/dns/rdtypes/ANY/NSEC3.py
@@ -0,0 +1,182 @@
+# Copyright (C) 2004-2007, 2009, 2010 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 base64
+import cStringIO
+import string
+import struct
+
+import dns.exception
+import dns.rdata
+import dns.rdatatype
+
+b32_hex_to_normal = string.maketrans('0123456789ABCDEFGHIJKLMNOPQRSTUV',
+                                     'ABCDEFGHIJKLMNOPQRSTUVWXYZ234567')
+b32_normal_to_hex = string.maketrans('ABCDEFGHIJKLMNOPQRSTUVWXYZ234567',
+                                     '0123456789ABCDEFGHIJKLMNOPQRSTUV')
+
+# hash algorithm constants
+SHA1 = 1
+
+# flag constants
+OPTOUT = 1
+
+class NSEC3(dns.rdata.Rdata):
+    """NSEC3 record
+
+    @ivar algorithm: the hash algorithm number
+    @type algorithm: int
+    @ivar flags: the flags
+    @type flags: int
+    @ivar iterations: the number of iterations
+    @type iterations: int
+    @ivar salt: the salt
+    @type salt: string
+    @ivar next: the next name hash
+    @type next: string
+    @ivar windows: the windowed bitmap list
+    @type windows: list of (window number, string) tuples"""
+
+    __slots__ = ['algorithm', 'flags', 'iterations', 'salt', 'next', 'windows']
+
+    def __init__(self, rdclass, rdtype, algorithm, flags, iterations, salt,
+                 next, windows):
+        super(NSEC3, self).__init__(rdclass, rdtype)
+        self.algorithm = algorithm
+        self.flags = flags
+        self.iterations = iterations
+        self.salt = salt
+        self.next = next
+        self.windows = windows
+
+    def to_text(self, origin=None, relativize=True, **kw):
+        next = base64.b32encode(self.next).translate(b32_normal_to_hex).lower()
+        if self.salt == '':
+            salt = '-'
+        else:
+            salt = self.salt.encode('hex-codec')
+        text = ''
+        for (window, bitmap) in self.windows:
+            bits = []
+            for i in xrange(0, len(bitmap)):
+                byte = ord(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 '%u %u %u %s %s%s' % (self.algorithm, self.flags, self.iterations,
+                                     salt, next, text)
+
+    def from_text(cls, rdclass, rdtype, tok, origin = None, relativize = True):
+        algorithm = tok.get_uint8()
+        flags = tok.get_uint8()
+        iterations = tok.get_uint16()
+        salt = tok.get_string()
+        if salt == '-':
+            salt = ''
+        else:
+            salt = salt.decode('hex-codec')
+        next = tok.get_string().upper().translate(b32_hex_to_normal)
+        next = base64.b32decode(next)
+        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("NSEC3 with bit 0")
+            if nrdtype > 65535:
+                raise dns.exception.SyntaxError("NSEC3 with bit > 65535")
+            rdtypes.append(nrdtype)
+        rdtypes.sort()
+        window = 0
+        octets = 0
+        prior_rdtype = 0
+        bitmap = ['\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, ''.join(bitmap[0:octets])))
+                bitmap = ['\0'] * 32
+                window = new_window
+            offset = nrdtype % 256
+            byte = offset / 8
+            bit = offset % 8
+            octets = byte + 1
+            bitmap[byte] = chr(ord(bitmap[byte]) | (0x80 >> bit))
+        windows.append((window, ''.join(bitmap[0:octets])))
+        return cls(rdclass, rdtype, algorithm, flags, iterations, salt, next, windows)
+
+    from_text = classmethod(from_text)
+
+    def to_wire(self, file, compress = None, origin = None):
+        l = len(self.salt)
+        file.write(struct.pack("!BBHB", self.algorithm, self.flags,
+                               self.iterations, l))
+        file.write(self.salt)
+        l = len(self.next)
+        file.write(struct.pack("!B", l))
+        file.write(self.next)
+        for (window, bitmap) in self.windows:
+            file.write(chr(window))
+            file.write(chr(len(bitmap)))
+            file.write(bitmap)
+
+    def from_wire(cls, rdclass, rdtype, wire, current, rdlen, origin = None):
+        (algorithm, flags, iterations, slen) = struct.unpack('!BBHB',
+                                                             wire[current : current + 5])
+        current += 5
+        rdlen -= 5
+        salt = wire[current : current + slen]
+        current += slen
+        rdlen -= slen
+        (nlen, ) = struct.unpack('!B', wire[current])
+        current += 1
+        rdlen -= 1
+        next = wire[current : current + nlen]
+        current += nlen
+        rdlen -= nlen
+        windows = []
+        while rdlen > 0:
+            if rdlen < 3:
+                raise dns.exception.FormError("NSEC3 too short")
+            window = ord(wire[current])
+            octets = ord(wire[current + 1])
+            if octets == 0 or octets > 32:
+                raise dns.exception.FormError("bad NSEC3 octets")
+            current += 2
+            rdlen -= 2
+            if rdlen < octets:
+                raise dns.exception.FormError("bad NSEC3 bitmap length")
+            bitmap = wire[current : current + octets]
+            current += octets
+            rdlen -= octets
+            windows.append((window, bitmap))
+        return cls(rdclass, rdtype, algorithm, flags, iterations, salt, next, windows)
+
+    from_wire = classmethod(from_wire)
+
+    def _cmp(self, other):
+        b1 = cStringIO.StringIO()
+        self.to_wire(b1)
+        b2 = cStringIO.StringIO()
+        other.to_wire(b2)
+        return cmp(b1.getvalue(), b2.getvalue())