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, 141 insertions, 0 deletions

diff --git a/source4/scripting/python/samba_external/dnspython/dns/rdtypes/ANY/NSEC.py b/source4/scripting/python/samba_external/dnspython/dns/rdtypes/ANY/NSEC.py
new file mode 100644
index 0000000000..72859ce108
--- /dev/null
+++ b/source4/scripting/python/samba_external/dnspython/dns/rdtypes/ANY/NSEC.py
@@ -0,0 +1,141 @@
+# 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 cStringIO
+
+import dns.exception
+import dns.rdata
+import dns.rdatatype
+import dns.name
+
+class NSEC(dns.rdata.Rdata):
+    """NSEC record
+
+    @ivar next: the next name
+    @type next: dns.name.Name object
+    @ivar windows: the windowed bitmap list
+    @type windows: list of (window number, string) tuples"""
+
+    __slots__ = ['next', 'windows']
+
+    def __init__(self, rdclass, rdtype, next, windows):
+        super(NSEC, self).__init__(rdclass, rdtype)
+        self.next = next
+        self.windows = windows
+
+    def to_text(self, origin=None, relativize=True, **kw):
+        next = self.next.choose_relativity(origin, relativize)
+        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 '%s%s' % (next, text)
+
+    def from_text(cls, rdclass, rdtype, tok, origin = None, relativize = True):
+        next = tok.get_name()
+        next = next.choose_relativity(origin, relativize)
+        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("NSEC with bit 0")
+            if nrdtype > 65535:
+                raise dns.exception.SyntaxError("NSEC 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, next, windows)
+
+    from_text = classmethod(from_text)
+
+    def to_wire(self, file, compress = None, origin = None):
+        self.next.to_wire(file, None, origin)
+        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):
+        (next, cused) = dns.name.from_wire(wire[: current + rdlen], current)
+        current += cused
+        rdlen -= cused
+        windows = []
+        while rdlen > 0:
+            if rdlen < 3:
+                raise dns.exception.FormError("NSEC too short")
+            window = ord(wire[current])
+            octets = ord(wire[current + 1])
+            if octets == 0 or octets > 32:
+                raise dns.exception.FormError("bad NSEC octets")
+            current += 2
+            rdlen -= 2
+            if rdlen < octets:
+                raise dns.exception.FormError("bad NSEC bitmap length")
+            bitmap = wire[current : current + octets]
+            current += octets
+            rdlen -= octets
+            windows.append((window, bitmap))
+        if not origin is None:
+            next = next.relativize(origin)
+        return cls(rdclass, rdtype, next, windows)
+
+    from_wire = classmethod(from_wire)
+
+    def choose_relativity(self, origin = None, relativize = True):
+        self.next = self.next.choose_relativity(origin, relativize)
+
+    def _cmp(self, other):
+        v = cmp(self.next, other.next)
+        if v == 0:
+            b1 = cStringIO.StringIO()
+            for (window, bitmap) in self.windows:
+                b1.write(chr(window))
+                b1.write(chr(len(bitmap)))
+                b1.write(bitmap)
+            b2 = cStringIO.StringIO()
+            for (window, bitmap) in other.windows:
+                b2.write(chr(window))
+                b2.write(chr(len(bitmap)))
+                b2.write(bitmap)
+            v = cmp(b1.getvalue(), b2.getvalue())
+        return v