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, 92 insertions, 0 deletions

diff --git a/source4/scripting/python/samba_external/dnspython/dns/rdtypes/dsbase.py b/source4/scripting/python/samba_external/dnspython/dns/rdtypes/dsbase.py
new file mode 100644
index 0000000000..aa46403a5f
--- /dev/null
+++ b/source4/scripting/python/samba_external/dnspython/dns/rdtypes/dsbase.py
@@ -0,0 +1,92 @@
+# Copyright (C) 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 struct
+
+import dns.rdata
+import dns.rdatatype
+
+class DSBase(dns.rdata.Rdata):
+    """Base class for rdata that is like a DS record
+
+    @ivar key_tag: the key tag
+    @type key_tag: int
+    @ivar algorithm: the algorithm
+    @type algorithm: int
+    @ivar digest_type: the digest type
+    @type digest_type: int
+    @ivar digest: the digest
+    @type digest: int
+    @see: draft-ietf-dnsext-delegation-signer-14.txt"""
+
+    __slots__ = ['key_tag', 'algorithm', 'digest_type', 'digest']
+
+    def __init__(self, rdclass, rdtype, key_tag, algorithm, digest_type,
+                 digest):
+        super(DSBase, self).__init__(rdclass, rdtype)
+        self.key_tag = key_tag
+        self.algorithm = algorithm
+        self.digest_type = digest_type
+        self.digest = digest
+
+    def to_text(self, origin=None, relativize=True, **kw):
+        return '%d %d %d %s' % (self.key_tag, self.algorithm,
+                                self.digest_type,
+                                dns.rdata._hexify(self.digest,
+                                                  chunksize=128))
+
+    def from_text(cls, rdclass, rdtype, tok, origin = None, relativize = True):
+        key_tag = tok.get_uint16()
+        algorithm = tok.get_uint8()
+        digest_type = tok.get_uint8()
+        chunks = []
+        while 1:
+            t = tok.get().unescape()
+            if t.is_eol_or_eof():
+                break
+            if not t.is_identifier():
+                raise dns.exception.SyntaxError
+            chunks.append(t.value)
+        digest = ''.join(chunks)
+        digest = digest.decode('hex_codec')
+        return cls(rdclass, rdtype, key_tag, algorithm, digest_type,
+                   digest)
+
+    from_text = classmethod(from_text)
+
+    def to_wire(self, file, compress = None, origin = None):
+        header = struct.pack("!HBB", self.key_tag, self.algorithm,
+                             self.digest_type)
+        file.write(header)
+        file.write(self.digest)
+
+    def from_wire(cls, rdclass, rdtype, wire, current, rdlen, origin = None):
+        header = struct.unpack("!HBB", wire[current : current + 4])
+        current += 4
+        rdlen -= 4
+        digest = wire[current : current + rdlen]
+        return cls(rdclass, rdtype, header[0], header[1], header[2], digest)
+
+    from_wire = classmethod(from_wire)
+
+    def _cmp(self, other):
+        hs = struct.pack("!HBB", self.key_tag, self.algorithm,
+                         self.digest_type)
+        ho = struct.pack("!HBB", other.key_tag, other.algorithm,
+                         other.digest_type)
+        v = cmp(hs, ho)
+        if v == 0:
+            v = cmp(self.digest, other.digest)
+        return v