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, 175 insertions, 0 deletions

diff --git a/source4/scripting/python/samba_external/dnspython/dns/rrset.py b/source4/scripting/python/samba_external/dnspython/dns/rrset.py
new file mode 100644
index 0000000000..7f6c4afed4
--- /dev/null
+++ b/source4/scripting/python/samba_external/dnspython/dns/rrset.py
@@ -0,0 +1,175 @@
+# Copyright (C) 2003-2007, 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.
+
+"""DNS RRsets (an RRset is a named rdataset)"""
+
+import dns.name
+import dns.rdataset
+import dns.rdataclass
+import dns.renderer
+
+class RRset(dns.rdataset.Rdataset):
+    """A DNS RRset (named rdataset).
+
+    RRset inherits from Rdataset, and RRsets can be treated as
+    Rdatasets in most cases.  There are, however, a few notable
+    exceptions.  RRsets have different to_wire() and to_text() method
+    arguments, reflecting the fact that RRsets always have an owner
+    name.
+    """
+
+    __slots__ = ['name', 'deleting']
+
+    def __init__(self, name, rdclass, rdtype, covers=dns.rdatatype.NONE,
+                 deleting=None):
+        """Create a new RRset."""
+
+        super(RRset, self).__init__(rdclass, rdtype)
+        self.name = name
+        self.deleting = deleting
+
+    def _clone(self):
+        obj = super(RRset, self)._clone()
+        obj.name = self.name
+        obj.deleting = self.deleting
+        return obj
+
+    def __repr__(self):
+        if self.covers == 0:
+            ctext = ''
+        else:
+            ctext = '(' + dns.rdatatype.to_text(self.covers) + ')'
+        if not self.deleting is None:
+            dtext = ' delete=' + dns.rdataclass.to_text(self.deleting)
+        else:
+            dtext = ''
+        return '<DNS ' + str(self.name) + ' ' + \
+               dns.rdataclass.to_text(self.rdclass) + ' ' + \
+               dns.rdatatype.to_text(self.rdtype) + ctext + dtext + ' RRset>'
+
+    def __str__(self):
+        return self.to_text()
+
+    def __eq__(self, other):
+        """Two RRsets are equal if they have the same name and the same
+        rdataset
+
+        @rtype: bool"""
+        if not isinstance(other, RRset):
+            return False
+        if self.name != other.name:
+            return False
+        return super(RRset, self).__eq__(other)
+
+    def match(self, name, rdclass, rdtype, covers, deleting=None):
+        """Returns True if this rrset matches the specified class, type,
+        covers, and deletion state."""
+
+        if not super(RRset, self).match(rdclass, rdtype, covers):
+            return False
+        if self.name != name or self.deleting != deleting:
+            return False
+        return True
+
+    def to_text(self, origin=None, relativize=True, **kw):
+        """Convert the RRset into DNS master file format.
+
+        @see: L{dns.name.Name.choose_relativity} for more information
+        on how I{origin} and I{relativize} determine the way names
+        are emitted.
+
+        Any additional keyword arguments are passed on to the rdata
+        to_text() method.
+
+        @param origin: The origin for relative names, or None.
+        @type origin: dns.name.Name object
+        @param relativize: True if names should names be relativized
+        @type relativize: bool"""
+
+        return super(RRset, self).to_text(self.name, origin, relativize,
+                                          self.deleting, **kw)
+
+    def to_wire(self, file, compress=None, origin=None, **kw):
+        """Convert the RRset to wire format."""
+
+        return super(RRset, self).to_wire(self.name, file, compress, origin,
+                                          self.deleting, **kw)
+
+    def to_rdataset(self):
+        """Convert an RRset into an Rdataset.
+
+        @rtype: dns.rdataset.Rdataset object
+        """
+        return dns.rdataset.from_rdata_list(self.ttl, list(self))
+
+
+def from_text_list(name, ttl, rdclass, rdtype, text_rdatas):
+    """Create an RRset with the specified name, TTL, class, and type, and with
+    the specified list of rdatas in text format.
+
+    @rtype: dns.rrset.RRset object
+    """
+
+    if isinstance(name, (str, unicode)):
+        name = dns.name.from_text(name, None)
+    if isinstance(rdclass, str):
+        rdclass = dns.rdataclass.from_text(rdclass)
+    if isinstance(rdtype, str):
+        rdtype = dns.rdatatype.from_text(rdtype)
+    r = RRset(name, rdclass, rdtype)
+    r.update_ttl(ttl)
+    for t in text_rdatas:
+        rd = dns.rdata.from_text(r.rdclass, r.rdtype, t)
+        r.add(rd)
+    return r
+
+def from_text(name, ttl, rdclass, rdtype, *text_rdatas):
+    """Create an RRset with the specified name, TTL, class, and type and with
+    the specified rdatas in text format.
+
+    @rtype: dns.rrset.RRset object
+    """
+
+    return from_text_list(name, ttl, rdclass, rdtype, text_rdatas)
+
+def from_rdata_list(name, ttl, rdatas):
+    """Create an RRset with the specified name and TTL, and with
+    the specified list of rdata objects.
+
+    @rtype: dns.rrset.RRset object
+    """
+
+    if isinstance(name, (str, unicode)):
+        name = dns.name.from_text(name, None)
+
+    if len(rdatas) == 0:
+        raise ValueError("rdata list must not be empty")
+    r = None
+    for rd in rdatas:
+        if r is None:
+            r = RRset(name, rd.rdclass, rd.rdtype)
+            r.update_ttl(ttl)
+            first_time = False
+        r.add(rd)
+    return r
+
+def from_rdata(name, ttl, *rdatas):
+    """Create an RRset with the specified name and TTL, and with
+    the specified rdata objects.
+
+    @rtype: dns.rrset.RRset object
+    """
+
+    return from_rdata_list(name, ttl, rdatas)