1 files changed, 92 insertions, 0 deletions
diff --git a/third_party/dnspython/dns/rdtypes/dsbase.py b/third_party/dnspython/dns/rdtypes/dsbase.py
new file mode 100644
index 0000000000..6f5559a7e4
--- /dev/null
+++ b/third_party/dnspython/dns/rdtypes/dsbase.py
@@ -0,0 +1,92 @@
+# Copyright (C) 2010, 2011 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].unwrap()
+        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