Added some documentation for the edns-cookies extension

Author: MelindaShore

doc/functions.rst

@@ -253,7 +253,7 @@ Extensions are Python dictionaries, with the keys being the names of the
 extensions.  The definition of each extension describes the values that
 may be assigned to that extension.  For most extensions it is a Boolean,
 and since the default value is "False" it will most often take the value
-``getdns.GETDNS_EXTENSION_TRUE``.
+``getdns.EXTENSION_TRUE``.
 
 The extensions currently supported by :py:mod:`getdns` are:
 
@@ -266,6 +266,12 @@ The extensions currently supported by :py:mod:`getdns` are:
    * ``specify_class``
    * ``return_call_debugging``
 
+Extensions that are optionally built (see above) include
+
+   * ``edns-cookies``
+
+``edns-cookies`` also takes the value ``getdns.EXTENSION_TRUE``.
+
 Extensions for DNSSEC
 ^^^^^^^^^^^^^^^^^^^^^
 

doc/index.rst

@@ -45,6 +45,11 @@ as follows:
 
   ./configure --with-libevent
 
+To enable the use of edns cookies in the Python bindings,
+you must compile support for them into libgetdns, by
+including the --enable-draft-edns-cookies argument to
+configure.
+
 This release has been tested against libgetdns 0.1.7.
 
 Building
@@ -67,6 +72,12 @@ build and install:
   python setup.py build
   python setup.py install
 
+We've added optional support for draft-ietf-dnsop-cookies.
+It is implemented as a getdns extension (see below).  It is
+not built by default.  To enable it, you must build
+libgetdns with cookies support and add the
+``--with-edns-cookies`` to the Python module build
+(i.e. ``python setup.py build --with-edns-cookies``).
 
 Using getdns
 ==============