[master] Merge branch 'trac983'

configure.ac

@@ -139,6 +139,16 @@ else
 	AC_SUBST(pkgpyexecdir)
 fi
 
+# We need to store the default pyexecdir in a separate variable so that
+# we can specify in Makefile.am the install directory of various BIND 10
+# python scripts and loadable modules; in Makefile.am we cannot replace
+# $(pyexecdir) using itself, e.g, this doesn't work:
+# pyexecdir = $(pyexecdir)/isc/some_module
+# The separate variable makes this setup possible as follows:
+# pyexecdir = $(PYTHON_SITEPKG_DIR)/isc/some_module
+PYTHON_SITEPKG_DIR=${pyexecdir}
+AC_SUBST(PYTHON_SITEPKG_DIR)
+
 # Check for python development environments
 if test -x ${PYTHON}-config; then
 	PYTHON_INCLUDES=`${PYTHON}-config --includes`
@@ -810,6 +820,8 @@ AC_CONFIG_FILES([Makefile
                  src/lib/cc/tests/Makefile
                  src/lib/python/Makefile
                  src/lib/python/isc/Makefile
+                 src/lib/python/isc/acl/Makefile
+                 src/lib/python/isc/acl/tests/Makefile
                  src/lib/python/isc/util/Makefile
                  src/lib/python/isc/util/tests/Makefile
                  src/lib/python/isc/datasrc/Makefile

src/lib/Makefile.am

@@ -1,3 +1,3 @@
-SUBDIRS = exceptions util log cryptolink dns cc config python xfr \
+SUBDIRS = exceptions util log cryptolink dns cc config acl python xfr \
           bench asiolink asiodns nsas cache resolve testutils datasrc \
-          acl server_common
+          server_common

src/lib/acl/acl.h

@@ -88,8 +88,11 @@ public:
      * the context against conditions and if it matches, returns the
      * action that belongs to the first matched entry or default action
      * if nothing matches.
+     *
      * \param context The thing that should be checked. It is directly
      *     passed to the checks.
+     *
+     * \return The action for the ACL entry that first matches the context.
      */
     const Action& execute(const Context& context) const {
         const typename Entries::const_iterator end(entries_.end());

src/lib/acl/loader.h

@@ -101,21 +101,21 @@ BasicAction defaultActionLoader(data::ConstElementPtr action);
  *
  * An ACL definition looks like this:
  * \verbatim
- * [
+ [
- *   {
+   {
- *      "action": "ACCEPT",
+      "action": "ACCEPT",
- *      "match-type": <parameter>
+      "match-type": <parameter>
- *   },
+   },
- *   {
+   {
- *      "action": "REJECT",
+      "action": "REJECT",
- *      "match-type": <parameter>
+      "match-type": <parameter>,
- *      "another-match-type": [<parameter1>, <parameter2>]
+      "another-match-type": [<parameter1>, <parameter2>]
-*    },
+   },
-*    {
+   {
-*       "action": "DROP"
+      "action": "DROP"
-*    }
+   }
- * ]
+ ]
- * \endverbatim
+ \endverbatim
  *
  * This is a list of elements. Each element must have an "action"
  * entry/keyword. That one specifies which action is returned if this

src/lib/python/isc/Makefile.am

@@ -1,4 +1,4 @@
-SUBDIRS = datasrc cc config log net notify util testutils
+SUBDIRS = datasrc cc config log net notify util testutils acl
 
 python_PYTHON = __init__.py
 

src/lib/python/isc/acl/Makefile.am

@@ -0,0 +1,45 @@
+SUBDIRS = . tests
+
+AM_CPPFLAGS = -I$(top_srcdir)/src/lib -I$(top_builddir)/src/lib
+AM_CPPFLAGS += $(BOOST_INCLUDES)
+AM_CXXFLAGS = $(B10_CXXFLAGS)
+
+python_PYTHON = __init__.py
+pythondir = $(PYTHON_SITEPKG_DIR)/isc/acl
+
+pyexec_LTLIBRARIES = acl.la dns.la
+pyexecdir = $(PYTHON_SITEPKG_DIR)/isc/acl
+
+acl_la_SOURCES = acl.cc
+acl_la_CPPFLAGS = $(AM_CPPFLAGS) $(PYTHON_INCLUDES)
+acl_la_LDFLAGS = $(PYTHON_LDFLAGS)
+acl_la_CXXFLAGS = $(AM_CXXFLAGS) $(PYTHON_CXXFLAGS)
+
+dns_la_SOURCES = dns.h dns.cc dns_requestacl_python.h dns_requestacl_python.cc
+dns_la_SOURCES += dns_requestcontext_python.h dns_requestcontext_python.cc
+dns_la_SOURCES += dns_requestloader_python.h dns_requestloader_python.cc
+dns_la_CPPFLAGS = $(AM_CPPFLAGS) $(PYTHON_INCLUDES)
+dns_la_LDFLAGS = $(PYTHON_LDFLAGS)
+# Note: PYTHON_CXXFLAGS may have some -Wno... workaround, which must be
+# placed after -Wextra defined in AM_CXXFLAGS
+dns_la_CXXFLAGS = $(AM_CXXFLAGS) $(PYTHON_CXXFLAGS)
+
+# Python prefers .so, while some OSes (specifically MacOS) use a different
+# suffix for dynamic objects.  -module is necessary to work this around.
+acl_la_LDFLAGS += -module
+acl_la_LIBADD = $(top_builddir)/src/lib/acl/libacl.la
+acl_la_LIBADD += $(PYTHON_LIB)
+
+dns_la_LDFLAGS += -module
+dns_la_LIBADD = $(top_builddir)/src/lib/acl/libdnsacl.la
+dns_la_LIBADD += $(PYTHON_LIB)
+
+EXTRA_DIST = acl.py dns.py
+EXTRA_DIST += acl_inc.cc
+EXTRA_DIST += dnsacl_inc.cc dns_requestacl_inc.cc dns_requestcontext_inc.cc
+EXTRA_DIST += dns_requestloader_inc.cc
+
+CLEANDIRS = __pycache__
+
+clean-local:
+	rm -rf $(CLEANDIRS)

src/lib/python/isc/acl/__init__.py

@@ -0,0 +1,11 @@
+"""
+Here are function and classes for manipulating access control lists.
+"""
+
+# The DNS ACL loader would need the json module.  Make sure it's imported
+# beforehand.
+import json
+
+# Other ACL modules highly depends on the main acl sub module, so it's
+# explicitly imported here.
+import isc.acl.acl

src/lib/python/isc/acl/acl.cc

@@ -0,0 +1,80 @@
+// Copyright (C) 2011  Internet Systems Consortium, Inc. ("ISC")
+//
+// Permission to use, copy, modify, and/or distribute this software 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 ISC DISCLAIMS ALL WARRANTIES WITH
+// REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
+// AND FITNESS.  IN NO EVENT SHALL ISC 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.
+
+#include <Python.h>
+
+#include <util/python/pycppwrapper_util.h>
+
+#include <acl/acl.h>
+
+using namespace isc::util::python;
+
+#include "acl_inc.cc"
+
+namespace {
+// Commonly used Python exception objects.  Right now the acl module consists
+// of only one .cc file, so we hide them in an unnamed namespace.  If and when
+// we extend this module with multiple .cc files, we should move them to
+// a named namespace, say isc::acl::python, and declare them in a separate
+// header file.
+PyObject* po_ACLError;
+PyObject* po_LoaderError;
+}
+
+namespace {
+PyModuleDef acl = {
+    { PyObject_HEAD_INIT(NULL) NULL, 0, NULL},
+    "isc.acl.acl",
+    acl_doc,
+    -1,
+    NULL,
+    NULL,
+    NULL,
+    NULL,
+    NULL
+};
+} // end of unnamed namespace
+
+PyMODINIT_FUNC
+PyInit_acl(void) {
+    PyObject* mod = PyModule_Create(&acl);
+    if (mod == NULL) {
+        return (NULL);
+    }
+
+    try {
+        po_ACLError = PyErr_NewException("isc.acl.Error", NULL, NULL);
+        PyObjectContainer(po_ACLError).installToModule(mod, "Error");
+
+        po_LoaderError = PyErr_NewException("isc.acl.LoaderError", NULL, NULL);
+        PyObjectContainer(po_LoaderError).installToModule(mod, "LoaderError");
+
+        // Install module constants.  Note that we can let Py_BuildValue
+        // "steal" the references to these object (by specifying false to
+        // installToModule), because, unlike the exception cases above,
+        // we don't have corresponding C++ variables (see the note in
+        // pycppwrapper_util for more details).
+        PyObjectContainer(Py_BuildValue("I", isc::acl::ACCEPT)).
+            installToModule(mod, "ACCEPT", false);
+        PyObjectContainer(Py_BuildValue("I", isc::acl::REJECT)).
+            installToModule(mod, "REJECT", false);
+        PyObjectContainer(Py_BuildValue("I", isc::acl::DROP)).
+            installToModule(mod, "DROP", false);
+    } catch (...) {
+        Py_DECREF(mod);
+        return (NULL);
+    }
+
+    return (mod);
+}

src/lib/python/isc/acl/acl.py

@@ -0,0 +1,29 @@
+# Copyright (C) 2011  Internet Systems Consortium.
+#
+# Permission to use, copy, modify, and distribute this software 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 INTERNET SYSTEMS CONSORTIUM
+# DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL
+# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL
+# INTERNET SYSTEMS CONSORTIUM 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.
+
+# This file is not installed; The .so version will be installed into the right
+# place at installation time.
+# This helper script is only to find it in the .libs directory when we run
+# as a test or from the build directory.
+
+import os
+import sys
+
+for base in sys.path[:]:
+    bindingdir = os.path.join(base, 'isc/acl/.libs')
+    if os.path.exists(bindingdir):
+        sys.path.insert(0, bindingdir)
+
+from acl import *

src/lib/python/isc/acl/acl_inc.cc

@@ -0,0 +1,16 @@
+namespace {
+const char* const acl_doc = "\
+Implementation module for ACL operations\n\n\
+This module provides Python bindings for the C++ classes in the\n\
+isc::acl namespace.\n\
+\n\
+Integer constants:\n\
+\n\
+ACCEPT, REJECT, DROP -- Default actions an ACL could perform.\n\
+  These are the commonly used actions in specific ACLs.\n\
+  It is possible to specify any other values, as the ACL class does\n\
+  nothing about them, but these look reasonable, so they are provided\n\
+  for convenience. It is not specified what exactly these mean and it's\n\
+  up to whoever uses them.\n\
+";
+} // unnamed namespace

src/lib/python/isc/acl/dns.cc

@@ -0,0 +1,135 @@
+// Copyright (C) 2011  Internet Systems Consortium, Inc. ("ISC")
+//
+// Permission to use, copy, modify, and/or distribute this software 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 ISC DISCLAIMS ALL WARRANTIES WITH
+// REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
+// AND FITNESS.  IN NO EVENT SHALL ISC 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.
+
+#include <Python.h>
+
+#include <stdexcept>
+#include <boost/shared_ptr.hpp>
+
+#include <util/python/pycppwrapper_util.h>
+
+#include <cc/data.h>
+
+#include <acl/acl.h>
+#include <acl/dns.h>
+
+#include "dns.h"
+#include "dns_requestcontext_python.h"
+#include "dns_requestacl_python.h"
+#include "dns_requestloader_python.h"
+
+using namespace std;
+using boost::shared_ptr;
+using namespace isc::util::python;
+using namespace isc::data;
+using namespace isc::acl::dns;
+using namespace isc::acl::dns::python;
+
+#include "dnsacl_inc.cc"
+
+namespace {
+// This is a Python binding object corresponding to the singleton loader used
+// in the C++ version of the library.
+// We can define it as a pure object rather than through an accessor function,
+// because in Python we can ensure it has been created and initialized
+// in the module initializer by the time it's actually used.
+s_RequestLoader* po_REQUEST_LOADER;
+
+PyMethodDef methods[] = {
+    { NULL, NULL, 0, NULL }
+};
+
+PyModuleDef dnsacl = {
+    { PyObject_HEAD_INIT(NULL) NULL, 0, NULL},
+    "isc.acl.dns",
+    dnsacl_doc,
+    -1,
+    methods,
+    NULL,
+    NULL,
+    NULL,
+    NULL
+};
+} // end of unnamed namespace
+
+namespace isc {
+namespace acl {
+namespace dns {
+namespace python {
+PyObject*
+getACLException(const char* ex_name) {
+    PyObject* ex_obj = NULL;
+
+    PyObject* acl_module = PyImport_AddModule("isc.acl.acl");
+    if (acl_module != NULL) {
+        PyObject* acl_dict = PyModule_GetDict(acl_module);
+        if (acl_dict != NULL) {
+            ex_obj = PyDict_GetItemString(acl_dict, ex_name);
+        }
+    }
+
+    if (ex_obj == NULL) {
+        ex_obj = PyExc_RuntimeError;
+    }
+    return (ex_obj);
+}
+}
+}
+}
+}
+
+PyMODINIT_FUNC
+PyInit_dns(void) {
+    PyObject* mod = PyModule_Create(&dnsacl);
+    if (mod == NULL) {
+        return (NULL);
+    }
+
+    if (!initModulePart_RequestContext(mod)) {
+        Py_DECREF(mod);
+        return (NULL);
+    }
+    if (!initModulePart_RequestACL(mod)) {
+        Py_DECREF(mod);
+        return (NULL);
+    }
+    if (!initModulePart_RequestLoader(mod)) {
+        Py_DECREF(mod);
+        return (NULL);
+    }
+
+    // Module constants
+    try {
+        if (po_REQUEST_LOADER == NULL) {
+            po_REQUEST_LOADER = static_cast<s_RequestLoader*>(
+                requestloader_type.tp_alloc(&requestloader_type, 0));
+        }
+        if (po_REQUEST_LOADER != NULL) {
+            // We gain and keep our own reference to the singleton object
+            // for the same reason as that for exception objects (see comments
+            // in pycppwrapper_util for more details).  Note also that we don't
+            // bother to release the reference even if exception is thrown
+            // below (in fact, we cannot delete the singleton loader).
+            po_REQUEST_LOADER->cppobj = &getRequestLoader();
+            Py_INCREF(po_REQUEST_LOADER);
+        }
+        PyObjectContainer(po_REQUEST_LOADER).installToModule(mod,
+                                                             "REQUEST_LOADER");
+    } catch (...) {
+        Py_DECREF(mod);
+        return (NULL);
+    }
+
+    return (mod);
+}

src/lib/python/isc/acl/dns.h

@@ -0,0 +1,52 @@
+// Copyright (C) 2011  Internet Systems Consortium, Inc. ("ISC")
+//
+// Permission to use, copy, modify, and/or distribute this software 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 ISC DISCLAIMS ALL WARRANTIES WITH
+// REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
+// AND FITNESS.  IN NO EVENT SHALL ISC 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.
+
+#ifndef __PYTHON_ACL_DNS_H
+#define __PYTHON_ACL_DNS_H 1
+
+#include <Python.h>
+
+namespace isc {
+namespace acl {
+namespace dns {
+namespace python {
+
+// Return a Python exception object of the given name (ex_name) defined in
+// the isc.acl.acl loadable module.
+//
+// Since the acl module is a different binary image and is loaded separately
+// from the dns module, it would be very tricky to directly access to
+// C/C++ symbols defined in that module.  So we get access to these object
+// using the Python interpretor through this wrapper function.
+//
+// The __init__.py file should ensure isc.acl.acl has been loaded by the time
+// whenever this function is called, and there shouldn't be any operation
+// within this function that can fail (such as dynamic memory allocation),
+// so this function should always succeed.  Yet there may be an overlooked
+// failure mode, perhaps due to a bug in the binding implementation, or
+// due to invalid usage.  As a last resort for such cases, this function
+// returns PyExc_RuntimeError (a C binding of Python's RuntimeError) should
+// it encounters an unexpected failure.
+extern PyObject* getACLException(const char* ex_name);
+
+} // namespace python
+} // namespace dns
+} // namespace acl
+} // namespace isc
+
+#endif // __PYTHON_ACL_DNS_H
+
+// Local Variables:
+// mode: c++
+// End:

src/lib/python/isc/acl/dns.py

@@ -0,0 +1,33 @@
+# Copyright (C) 2011  Internet Systems Consortium.
+#
+# Permission to use, copy, modify, and distribute this software 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 INTERNET SYSTEMS CONSORTIUM
+# DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL
+# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL
+# INTERNET SYSTEMS CONSORTIUM 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.
+
+# This file is not installed. The log.so is installed into the right place.
+# It is only to find it in the .libs directory when we run as a test or
+# from the build directory.
+# But as nobody gives us the builddir explicitly (and we can't use generation
+# from .in file, as it would put us into the builddir and we wouldn't be found)
+# we guess from current directory. Any idea for something better? This should
+# be enough for the tests, but would it work for B10_FROM_SOURCE as well?
+# Should we look there? Or define something in bind10_config?
+
+import os
+import sys
+
+for base in sys.path[:]:
+    bindingdir = os.path.join(base, 'isc/acl/.libs')
+    if os.path.exists(bindingdir):
+        sys.path.insert(0, bindingdir)
+
+from dns import *

src/lib/python/isc/acl/dns_requestacl_inc.cc

@@ -0,0 +1,33 @@
+namespace {
+const char* const RequestACL_doc = "\
+The DNS Request ACL.\n\
+\n\
+It holds bunch of ordered entries, each one consisting of a check for\n\
+a given DNS Request context and an action, which is one of ACCEPT,\n\
+REJECT, or DROP, as defined in the isc.acl.acl module.\n\
+The checks are tested in the order and first match counts.\n\
+\n\
+A RequestACL object cannot be constructed directly; an application\n\
+must use isc.acl.dns.load_request_acl() to create a RequestACL object.\n\
+\n\
+";
+
+const char* const RequestACL_execute_doc = "\
+execute(context) -> action \n\
+\n\
+The returned action is one of ACCEPT, REJECT or DROP as defined in\n\
+the isc.acl.acl module.\n\
+\n\
+This is the function that takes the ACL entries one by one, checks the\n\
+context against conditions and if it matches, returns the action that\n\
+belongs to the first matched entry or default action if nothing\n\
+matches.\n\
+\n\
+Parameters:\n\
+  context    The thing that should be checked. It is directly passed\n\
+             to the checks.\n\
+\n\
+Return Value(s): The action for the ACL entry that first matches the\n\
+context.\n\
+";
+} // unnamed namespace

src/lib/python/isc/acl/dns_requestacl_python.cc

@@ -0,0 +1,184 @@
+// Copyright (C) 2011  Internet Systems Consortium, Inc. ("ISC")
+//
+// Permission to use, copy, modify, and/or distribute this software 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 ISC DISCLAIMS ALL WARRANTIES WITH
+// REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
+// AND FITNESS.  IN NO EVENT SHALL ISC 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.
+
+// Enable this if you use s# variants with PyArg_ParseTuple(), see
+// http://docs.python.org/py3k/c-api/arg.html#strings-and-buffers
+//#define PY_SSIZE_T_CLEAN
+
+// Python.h needs to be placed at the head of the program file, see:
+// http://docs.python.org/py3k/extending/extending.html#a-simple-example
+#include <Python.h>
+
+#include <string>
+#include <stdexcept>
+
+#include <util/python/pycppwrapper_util.h>
+
+#include <acl/acl.h>
+#include <acl/dns.h>
+
+#include "dns.h"
+#include "dns_requestacl_python.h"
+#include "dns_requestcontext_python.h"
+
+using namespace std;
+using namespace isc::util::python;
+using namespace isc::acl;
+using namespace isc::acl::dns;
+using namespace isc::acl::dns::python;
+
+//
+// Definition of the classes
+//
+
+// For each class, we need a struct, a helper functions (init, destroy,
+// and static wrappers around the methods we export), a list of methods,
+// and a type description
+
+//
+// RequestACL
+//
+
+// Trivial constructor.
+s_RequestACL::s_RequestACL() {}
+
+// Import pydoc text
+#include "dns_requestacl_inc.cc"
+
+namespace {
+int
+RequestACL_init(PyObject*, PyObject*, PyObject*) {
+    PyErr_SetString(getACLException("Error"),
+                    "RequestACL cannot be directly constructed");
+    return (-1);
+}
+
+void
+RequestACL_destroy(PyObject* po_self) {
+    s_RequestACL* const self = static_cast<s_RequestACL*>(po_self);
+    self->cppobj.reset();
+    Py_TYPE(self)->tp_free(self);
+}
+
+PyObject*
+RequestACL_execute(PyObject* po_self, PyObject* args) {
+    s_RequestACL* const self = static_cast<s_RequestACL*>(po_self);
+
+    try {
+        const s_RequestContext* po_context;
+        if (PyArg_ParseTuple(args, "O!", &requestcontext_type, &po_context)) {
+            const BasicAction action =
+                self->cppobj->execute(*po_context->cppobj);
+            return (Py_BuildValue("I", action));
+        }
+    } catch (const exception& ex) {
+        const string ex_what = "Failed to execute ACL: " + string(ex.what());
+        PyErr_SetString(getACLException("Error"), ex_what.c_str());
+    } catch (...) {
+        PyErr_SetString(PyExc_RuntimeError,
+                        "Unexpected exception in executing ACL");
+    }
+
+    return (NULL);
+}
+
+// This list contains the actual set of functions we have in
+// python. Each entry has
+// 1. Python method name
+// 2. Our static function here
+// 3. Argument type
+// 4. Documentation
+PyMethodDef RequestACL_methods[] = {
+    { "execute", RequestACL_execute, METH_VARARGS, RequestACL_execute_doc },
+    { NULL, NULL, 0, NULL }
+};
+} // end of unnamed namespace
+
+namespace isc {
+namespace acl {
+namespace dns {
+namespace python {
+// This defines the complete type for reflection in python and
+// parsing of PyObject* to s_RequestACL
+// Most of the functions are not actually implemented and NULL here.
+PyTypeObject requestacl_type = {
+    PyVarObject_HEAD_INIT(NULL, 0)
+    "isc.acl.dns.RequestACL",
+    sizeof(s_RequestACL),                 // tp_basicsize
+    0,                                  // tp_itemsize
+    RequestACL_destroy,                // tp_dealloc
+    NULL,                               // tp_print
+    NULL,                               // tp_getattr
+    NULL,                               // tp_setattr
+    NULL,                               // tp_reserved
+    NULL,                               // tp_repr
+    NULL,                               // tp_as_number
+    NULL,                               // tp_as_sequence
+    NULL,                               // tp_as_mapping
+    NULL,                               // tp_hash
+    NULL,                               // tp_call
+    NULL,	                       // tp_str
+    NULL,                               // tp_getattro
+    NULL,                               // tp_setattro
+    NULL,                               // tp_as_buffer
+    Py_TPFLAGS_DEFAULT,                 // tp_flags
+    RequestACL_doc,
+    NULL,                               // tp_traverse
+    NULL,                               // tp_clear
+    NULL,				 // tp_richcompare
+    0,                                  // tp_weaklistoffset
+    NULL,                               // tp_iter
+    NULL,                               // tp_iternext
+    RequestACL_methods,                   // tp_methods
+    NULL,                               // tp_members
+    NULL,                               // tp_getset
+    NULL,                               // tp_base
+    NULL,                               // tp_dict
+    NULL,                               // tp_descr_get
+    NULL,                               // tp_descr_set
+    0,                                  // tp_dictoffset
+    RequestACL_init,                    // tp_init
+    NULL,                               // tp_alloc
+    PyType_GenericNew,                  // tp_new
+    NULL,                               // tp_free
+    NULL,                               // tp_is_gc
+    NULL,                               // tp_bases
+    NULL,                               // tp_mro
+    NULL,                               // tp_cache
+    NULL,                               // tp_subclasses
+    NULL,                               // tp_weaklist
+    NULL,                               // tp_del
+    0                                   // tp_version_tag
+};
+
+bool
+initModulePart_RequestACL(PyObject* mod) {
+    // We initialize the static description object with PyType_Ready(),
+    // then add it to the module. This is not just a check! (leaving
+    // this out results in segmentation faults)
+    if (PyType_Ready(&requestacl_type) < 0) {
+        return (false);
+    }
+    void* p = &requestacl_type;
+    if (PyModule_AddObject(mod, "RequestACL", static_cast<PyObject*>(p)) < 0) {
+        return (false);
+    }
+    Py_INCREF(&requestacl_type);
+
+    return (true);
+}
+} // namespace python
+} // namespace dns
+} // namespace acl
+} // namespace isc

src/lib/python/isc/acl/dns_requestacl_python.h

@@ -0,0 +1,53 @@
+// Copyright (C) 2011  Internet Systems Consortium, Inc. ("ISC")
+//
+// Permission to use, copy, modify, and/or distribute this software 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 ISC DISCLAIMS ALL WARRANTIES WITH
+// REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
+// AND FITNESS.  IN NO EVENT SHALL ISC 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.
+
+#ifndef __PYTHON_REQUESTACL_H
+#define __PYTHON_REQUESTACL_H 1
+
+#include <Python.h>
+
+#include <boost/shared_ptr.hpp>
+
+#include <acl/dns.h>
+
+namespace isc {
+namespace acl {
+namespace dns {
+namespace python {
+
+// The s_* Class simply covers one instantiation of the object
+class s_RequestACL : public PyObject {
+public:
+    s_RequestACL();
+
+    // We don't have to use a shared pointer for its original purposes as
+    // the python object maintains reference counters itself.  But the
+    // underlying C++ API only exposes a shared pointer for the ACL objects,
+    // so we store it in that form.
+    boost::shared_ptr<RequestACL> cppobj;
+};
+
+extern PyTypeObject requestacl_type;
+
+bool initModulePart_RequestACL(PyObject* mod);
+
+} // namespace python
+} // namespace dns
+} // namespace acl
+} // namespace isc
+#endif // __PYTHON_REQUESTACL_H
+
+// Local Variables:
+// mode: c++
+// End:

src/lib/python/isc/acl/dns_requestcontext_inc.cc

@@ -0,0 +1,30 @@
+namespace {
+const char* const RequestContext_doc = "\
+DNS request to be checked.\n\
+\n\
+This plays the role of ACL context for the RequestACL object.\n\
+\n\
+Based on the minimalist philosophy, the initial implementation only\n\
+maintains the remote (source) IP address of the request. The plan is\n\
+to add more parameters of the request. A scheduled next step is to\n\
+support the TSIG key (if it's included in the request). Other\n\
+possibilities are the local (destination) IP address, the remote and\n\
+local port numbers, various fields of the DNS request (e.g. a\n\
+particular header flag value).\n\
+\n\
+RequestContext(remote_address)\n\
+\n\
+    In this initial implementation, the constructor only takes a\n\
+    remote IP address in the form of a socket address as used in the\n\
+    Python socket module.\n\
+\n\
+    Exceptions:\n\
+      isc.acl.ACLError Normally shouldn't happen, but still possible\n\
+                     for unexpected errors such as memory allocation\n\
+                     failure or an invalid address text being passed.\n\
+\n\
+    Parameters:\n\
+      remote_address The remote IP address\n\
+\n\
+";
+} // unnamed namespace

src/lib/python/isc/acl/dns_requestcontext_python.cc

@@ -0,0 +1,319 @@
+// Copyright (C) 2011  Internet Systems Consortium, Inc. ("ISC")
+//
+// Permission to use, copy, modify, and/or distribute this software 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 ISC DISCLAIMS ALL WARRANTIES WITH
+// REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
+// AND FITNESS.  IN NO EVENT SHALL ISC 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.
+
+// Enable this if you use s# variants with PyArg_ParseTuple(), see
+// http://docs.python.org/py3k/c-api/arg.html#strings-and-buffers
+//#define PY_SSIZE_T_CLEAN
+
+// Python.h needs to be placed at the head of the program file, see:
+// http://docs.python.org/py3k/extending/extending.html#a-simple-example
+#include <Python.h>
+
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <netinet/in.h>
+#include <netdb.h>
+#include <string.h>
+
+#include <cassert>
+#include <memory>
+#include <string>
+#include <sstream>
+#include <stdexcept>
+
+#include <boost/scoped_ptr.hpp>
+#include <boost/lexical_cast.hpp>
+
+#include <exceptions/exceptions.h>
+
+#include <util/python/pycppwrapper_util.h>
+
+#include <acl/dns.h>
+#include <acl/ip_check.h>
+
+#include "dns.h"
+#include "dns_requestcontext_python.h"
+
+using namespace std;
+using boost::scoped_ptr;
+using boost::lexical_cast;
+using namespace isc;
+using namespace isc::util::python;
+using namespace isc::acl::dns;
+using namespace isc::acl::dns::python;
+
+namespace isc {
+namespace acl {
+namespace dns {
+namespace python {
+
+struct s_RequestContext::Data {
+    // The constructor.  Currently it only accepts the information of the
+    // request source address, and contains all necessary logic in the body
+    // of the constructor.  As it's extended we may have refactor it by
+    // introducing helper methods.
+    Data(const char* const remote_addr, const unsigned short remote_port) {
+        struct addrinfo hints, *res;
+        memset(&hints, 0, sizeof(hints));
+        hints.ai_family = AF_UNSPEC;
+        hints.ai_socktype = SOCK_DGRAM;
+        hints.ai_protocol = IPPROTO_UDP;
+        hints.ai_flags = AI_NUMERICHOST | AI_NUMERICSERV;
+        const int error(getaddrinfo(remote_addr,
+                                    lexical_cast<string>(remote_port).c_str(),
+                                    &hints, &res));
+        if (error != 0) {
+            isc_throw(InvalidParameter, "Failed to convert [" << remote_addr
+                      << "]:" << remote_port << ", " << gai_strerror(error));
+        }
+        assert(sizeof(remote_ss) > res->ai_addrlen);
+        memcpy(&remote_ss, res->ai_addr, res->ai_addrlen);
+        remote_salen = res->ai_addrlen;
+        freeaddrinfo(res);
+
+        remote_ipaddr.reset(new IPAddress(getRemoteSockaddr()));
+    }
+
+    // A convenient type converter from sockaddr_storage to sockaddr
+    const struct sockaddr& getRemoteSockaddr() const {
+        const void* p = &remote_ss;
+        return (*static_cast<const struct sockaddr*>(p));
+    }
+
+    // The remote (source) IP address the request.  Note that it needs
+    // a reference to remote_ss.  That's why the latter is stored within
+    // this structure.
+    scoped_ptr<IPAddress> remote_ipaddr;
+
+    // The effective length of remote_ss.  It's necessary for getnameinf()
+    // called from sockaddrToText (__str__ backend).
+    socklen_t remote_salen;
+
+private:
+    struct sockaddr_storage remote_ss;
+};
+
+} // namespace python
+} // namespace dns
+} // namespace acl
+} // namespace isc
+
+
+//
+// Definition of the classes
+//
+
+// For each class, we need a struct, a helper functions (init, destroy,
+// and static wrappers around the methods we export), a list of methods,
+// and a type description
+
+//
+// RequestContext
+//
+
+// Trivial constructor.
+s_RequestContext::s_RequestContext() : cppobj(NULL), data_(NULL) {
+}
+
+// Import pydoc text
+#include "dns_requestcontext_inc.cc"
+
+namespace {
+// This list contains the actual set of functions we have in
+// python. Each entry has
+// 1. Python method name
+// 2. Our static function here
+// 3. Argument type
+// 4. Documentation
+PyMethodDef RequestContext_methods[] = {
+    { NULL, NULL, 0, NULL }
+};
+
+int
+RequestContext_init(PyObject* po_self, PyObject* args, PyObject*) {
+    s_RequestContext* const self = static_cast<s_RequestContext*>(po_self);
+
+    try {
+        // In this initial implementation, the constructor is simply: It
+        // takes a single parameter, which should be a Python socket address
+        // object.  For IPv4, it's ('address test', numeric_port); for IPv6,
+        // it's ('address text', num_port, num_flowid, num_zoneid).
+        // Below, we parse the argument in the most straightforward way.
+        // As the constructor becomes more complicated, we should probably
+        // make it more structural (for example, we should first retrieve
+        // the socket address as a PyObject, and parse it recursively)
+
+        const char* remote_addr;
+        unsigned short remote_port;
+        unsigned int remote_flowinfo; // IPv6 only, unused here
+        unsigned int remote_zoneid; // IPv6 only, unused here
+
+        if (PyArg_ParseTuple(args, "(sH)", &remote_addr, &remote_port) ||
+            PyArg_ParseTuple(args, "(sHII)", &remote_addr, &remote_port,
+                             &remote_flowinfo, &remote_zoneid))
+        {
+            // We need to clear the error in case the first call to PareTuple
+            // fails.
+            PyErr_Clear();
+
+            auto_ptr<s_RequestContext::Data> dataptr(
+                new s_RequestContext::Data(remote_addr, remote_port));
+            self->cppobj = new RequestContext(*dataptr->remote_ipaddr);
+            self->data_ = dataptr.release();
+            return (0);
+        }
+    } catch (const exception& ex) {
+        const string ex_what = "Failed to construct RequestContext object: " +
+            string(ex.what());
+        PyErr_SetString(getACLException("Error"), ex_what.c_str());
+        return (-1);
+    } catch (...) {
+        PyErr_SetString(PyExc_RuntimeError,
+                        "Unexpected exception in constructing RequestContext");
+        return (-1);
+    }
+
+    PyErr_SetString(PyExc_TypeError,
+                    "Invalid arguments to RequestContext constructor");
+
+    return (-1);
+}
+
+void
+RequestContext_destroy(PyObject* po_self) {
+    s_RequestContext* const self = static_cast<s_RequestContext*>(po_self);
+
+    delete self->cppobj;
+    delete self->data_;
+    Py_TYPE(self)->tp_free(self);
+}
+
+// A helper function for __str__()
+string
+sockaddrToText(const struct sockaddr& sa, socklen_t sa_len) {
+    char hbuf[NI_MAXHOST], sbuf[NI_MAXSERV];
+    if (getnameinfo(&sa, sa_len, hbuf, sizeof(hbuf), sbuf, sizeof(sbuf),
+                    NI_NUMERICHOST | NI_NUMERICSERV)) {
+        // In this context this should never fail.
+        isc_throw(Unexpected, "Unexpected failure in getnameinfo");
+    }
+
+    return ("[" + string(hbuf) + "]:" + string(sbuf));
+}
+
+// for the __str__() method.  This method is provided mainly for internal
+// testing.
+PyObject*
+RequestContext_str(PyObject* po_self) {
+    const s_RequestContext* const self =
+        static_cast<s_RequestContext*>(po_self);
+
+    try {
+        stringstream objss;
+        objss << "<" << requestcontext_type.tp_name << " object, "
+              << "remote_addr="
+              << sockaddrToText(self->data_->getRemoteSockaddr(),
+                                self->data_->remote_salen) << ">";
+        return (Py_BuildValue("s", objss.str().c_str()));
+    } catch (const exception& ex) {
+        const string ex_what =
+            "Failed to convert RequestContext object to text: " +
+            string(ex.what());
+        PyErr_SetString(PyExc_RuntimeError, ex_what.c_str());
+    } catch (...) {
+        PyErr_SetString(PyExc_SystemError, "Unexpected failure in "
+                        "converting RequestContext object to text");
+    }
+    return (NULL);
+}
+} // end of unnamed namespace
+
+namespace isc {
+namespace acl {
+namespace dns {
+namespace python {
+// This defines the complete type for reflection in python and
+// parsing of PyObject* to s_RequestContext
+// Most of the functions are not actually implemented and NULL here.
+PyTypeObject requestcontext_type = {
+    PyVarObject_HEAD_INIT(NULL, 0)
+    "isc.acl.dns.RequestContext",
+    sizeof(s_RequestContext),                 // tp_basicsize
+    0,                                  // tp_itemsize
+    RequestContext_destroy,             // tp_dealloc
+    NULL,                               // tp_print
+    NULL,                               // tp_getattr
+    NULL,                               // tp_setattr
+    NULL,                               // tp_reserved
+    NULL,                               // tp_repr
+    NULL,                               // tp_as_number
+    NULL,                               // tp_as_sequence
+    NULL,                               // tp_as_mapping
+    NULL,                               // tp_hash
+    NULL,                               // tp_call
+    RequestContext_str,                 // tp_str
+    NULL,                               // tp_getattro
+    NULL,                               // tp_setattro
+    NULL,                               // tp_as_buffer
+    Py_TPFLAGS_DEFAULT,                 // tp_flags
+    RequestContext_doc,
+    NULL,                               // tp_traverse
+    NULL,                               // tp_clear
+    NULL, // tp_richcompare
+    0,                                  // tp_weaklistoffset
+    NULL,                               // tp_iter
+    NULL,                               // tp_iternext
+    RequestContext_methods,                   // tp_methods
+    NULL,                               // tp_members
+    NULL,                               // tp_getset
+    NULL,                               // tp_base
+    NULL,                               // tp_dict
+    NULL,                               // tp_descr_get
+    NULL,                               // tp_descr_set
+    0,                                  // tp_dictoffset
+    RequestContext_init,                // tp_init
+    NULL,                               // tp_alloc
+    PyType_GenericNew,                  // tp_new
+    NULL,                               // tp_free
+    NULL,                               // tp_is_gc
+    NULL,                               // tp_bases
+    NULL,                               // tp_mro
+    NULL,                               // tp_cache
+    NULL,                               // tp_subclasses
+    NULL,                               // tp_weaklist
+    NULL,                               // tp_del
+    0                                   // tp_version_tag
+};
+
+bool
+initModulePart_RequestContext(PyObject* mod) {
+    // We initialize the static description object with PyType_Ready(),
+    // then add it to the module. This is not just a check! (leaving
+    // this out results in segmentation faults)
+    if (PyType_Ready(&requestcontext_type) < 0) {
+        return (false);
+    }
+    void* p = &requestcontext_type;
+    if (PyModule_AddObject(mod, "RequestContext",
+                           static_cast<PyObject*>(p)) < 0) {
+        return (false);
+    }
+    Py_INCREF(&requestcontext_type);
+
+    return (true);
+}
+} // namespace python
+} // namespace dns
+} // namespace acl
+} // namespace isc

src/lib/python/isc/acl/dns_requestcontext_python.h

@@ -0,0 +1,54 @@
+// Copyright (C) 2011  Internet Systems Consortium, Inc. ("ISC")
+//
+// Permission to use, copy, modify, and/or distribute this software 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 ISC DISCLAIMS ALL WARRANTIES WITH
+// REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
+// AND FITNESS.  IN NO EVENT SHALL ISC 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.
+
+#ifndef __PYTHON_REQUESTCONTEXT_H
+#define __PYTHON_REQUESTCONTEXT_H 1
+
+#include <Python.h>
+
+#include <acl/dns.h>
+
+namespace isc {
+namespace acl {
+namespace dns {
+namespace python {
+
+// The s_* Class simply covers one instantiation of the object
+class s_RequestContext : public PyObject {
+public:
+    s_RequestContext();
+    RequestContext* cppobj;
+
+    // This object needs to maintain some source data to construct the
+    // underlying RequestContext object throughout its lifetime.
+    // These are "public" so that it can be accessed in the python wrapper
+    // implementation, but essentially they should be private, and the
+    // implementation details are hidden.
+    struct Data;
+    Data* data_;
+};
+
+extern PyTypeObject requestcontext_type;
+
+bool initModulePart_RequestContext(PyObject* mod);
+
+} // namespace python
+} // namespace dns
+} // namespace acl
+} // namespace isc
+#endif // __PYTHON_REQUESTCONTEXT_H
+
+// Local Variables:
+// mode: c++
+// End:

src/lib/python/isc/acl/dns_requestloader_inc.cc

@@ -0,0 +1,87 @@
+namespace {
+
+// Note: this is derived from the generic Loader class of the C++
+// implementation, but is slightly different from the original.
+// Be careful when you make further merge from the C++ document.
+const char* const RequestLoader_doc = "\
+Loader of DNS Request ACLs.\n\
+\n\
+The goal of this class is to convert JSON description of an ACL to\n\
+object of the ACL class (including the checks inside it).\n\
+\n\
+To allow any kind of checks to exist in the application, creators are\n\
+registered for the names of the checks (this feature is not yet\n\
+available for the python API).\n\
+\n\
+An ACL definition looks like this:  [\n\
+   {\n\
+      \"action\": \"ACCEPT\",\n\
+      \"match-type\": <parameter>\n\
+   },\n\
+   {\n\
+      \"action\": \"REJECT\",\n\
+      \"match-type\": <parameter>,\n\
+      \"another-match-type\": [<parameter1>, <parameter2>]\n\
+   },\n\
+   {\n\
+      \"action\": \"DROP\"\n\
+   }\n\
+ ]\n\
+ \n\
+\n\
+This is a list of elements. Each element must have an \"action\"\n\
+entry/keyword. That one specifies which action is returned if this\n\
+element matches (the value of the key is passed to the action loader\n\
+(see the constructor), which is one of ACCEPT,\n\
+REJECT, or DROP, as defined in the isc.acl.acl module.\n\
+\n\
+The rest of the element are matches. The left side is the name of the\n\
+match type (for example \"from\" to match for source IP address).\n\
+The <parameter> is whatever is needed to describe the\n\
+match and depends on the match type, the loader passes it verbatim to\n\
+creator of that match type.\n\
+\n\
+There may be multiple match types in single element. In such case, all\n\
+of the matches must match for the element to take action (so, in the\n\
+second element, both \"match-type\" and \"another-match-type\" must be\n\
+satisfied). If there's no match in the element, the action is\n\
+taken/returned without conditions, every time (makes sense as the last\n\
+entry, as the ACL will never get past it).\n\
+\n\
+The second entry shows another thing - if there's a list as the value\n\
+for some match and the match itself is not expecting a list, it is\n\
+taken as an \"or\" - a match for at last one of the choices in the\n\
+list must match. So, for the second entry, both \"match-type\" and\n\
+\"another-match-type\" must be satisfied, but the another one is\n\
+satisfied by either parameter1 or parameter2.\n\
+\n\
+Currently, a RequestLoader object cannot be constructed directly;\n\
+an application must use the singleton loader defined in the\n\
+isc.acl.dns module, i.e., isc.acl.dns.REQUEST_LOADER.\n\
+A future version of this implementation may be extended to give\n\
+applications full flexibility of creating arbitrary loader, when\n\
+this restriction may be removed.\n\
+";
+
+const char* const RequestLoader_load_doc = "\
+load(description) -> RequestACL\n\
+\n\
+Load a DNS (Request) ACL.\n\
+\n\
+This parses an ACL list, creates internal data for each rule\n\
+and returns a RequestACl object that contains all given rules.\n\
+\n\
+Exceptions:\n\
+  LoaderError Load failed.  The most likely cause of this is a syntax\n\
+              error in the description.  Other internal errors such as\n\
+              memory allocation failure is also converted to this\n\
+              exception.\n\
+\n\
+Parameters:\n\
+  description String or Python representation of the JSON list of\n\
+              ACL. The Python representation is ones accepted by the\n\
+              standard json module.\n\
+\n\
+Return Value(s): The newly created RequestACL object\n\
+";
+} // unnamed namespace

src/lib/python/isc/acl/dns_requestloader_python.cc

@@ -0,0 +1,270 @@
+// Copyright (C) 2011  Internet Systems Consortium, Inc. ("ISC")
+//
+// Permission to use, copy, modify, and/or distribute this software 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 ISC DISCLAIMS ALL WARRANTIES WITH
+// REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
+// AND FITNESS.  IN NO EVENT SHALL ISC 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.
+
+// Enable this if you use s# variants with PyArg_ParseTuple(), see
+// http://docs.python.org/py3k/c-api/arg.html#strings-and-buffers
+//#define PY_SSIZE_T_CLEAN
+
+// Python.h needs to be placed at the head of the program file, see:
+// http://docs.python.org/py3k/extending/extending.html#a-simple-example
+#include <Python.h>
+
+#include <string>
+#include <stdexcept>
+
+#include <boost/shared_ptr.hpp>
+
+#include <util/python/pycppwrapper_util.h>
+
+#include <cc/data.h>
+
+#include <acl/dns.h>
+
+#include "dns.h"
+#include "dns_requestacl_python.h"
+#include "dns_requestloader_python.h"
+
+using namespace std;
+using boost::shared_ptr;
+using namespace isc::util::python;
+using namespace isc::data;
+using namespace isc::acl::dns;
+using namespace isc::acl::dns::python;
+
+//
+// Definition of the classes
+//
+
+// For each class, we need a struct, a helper functions (init, destroy,
+// and static wrappers around the methods we export), a list of methods,
+// and a type description
+
+//
+// RequestLoader
+//
+
+// Trivial constructor.
+s_RequestLoader::s_RequestLoader() : cppobj(NULL) {
+}
+
+// Import pydoc text
+#include "dns_requestloader_inc.cc"
+
+namespace {
+//
+// We declare the functions here, the definitions are below
+// the type definition of the object, since both can use the other
+//
+
+int
+RequestLoader_init(PyObject*, PyObject*, PyObject*) {
+    PyErr_SetString(getACLException("Error"),
+                    "RequestLoader cannot be directly constructed");
+    return (-1);
+}
+
+void
+RequestLoader_destroy(PyObject* po_self) {
+    s_RequestLoader* const self = static_cast<s_RequestLoader*>(po_self);
+    delete self->cppobj;
+    self->cppobj = NULL;
+    Py_TYPE(self)->tp_free(self);
+}
+
+// This C structure corresponds to a Python callable object for json.dumps().
+// This is initialized at the class initialization time (in
+// initModulePart_RequestLoader() below) and it's ensured to be non NULL and
+// valid in the rest of the class implementation.
+// Getting access to the json module this way and call one of its functions
+// via PyObject_CallObject() may exceed the reasonably acceptable level for
+// straightforward bindings.  But the alternative would be to write a Python
+// frontend for the entire module only for this conversion, which would also
+// be too much.  So, right now, we implement everything within the binding
+// implementation.  If future extensions require more such non trivial
+// wrappers, we should consider the frontend approach more seriously.
+PyObject* json_dumps_obj = NULL;
+
+PyObject*
+RequestLoader_load(PyObject* po_self, PyObject* args) {
+    s_RequestLoader* const self = static_cast<s_RequestLoader*>(po_self);
+
+    try {
+        PyObjectContainer c1, c2; // placeholder for temporary py objects
+        const char* acl_config;
+
+        // First, try string
+        int py_result = PyArg_ParseTuple(args, "s", &acl_config);
+        if (!py_result) {
+            PyErr_Clear();  // need to clear the error from ParseTuple
+
+            // If that fails, confirm the argument is a single Python object,
+            // and pass the argument to json.dumps() without conversion.
+            // Note that we should pass 'args', not 'json_obj' to
+            // PyObject_CallObject(), since this function expects a form of
+            // tuple as its argument parameter, just like ParseTuple.
+            PyObject* json_obj;
+            if (PyArg_ParseTuple(args, "O", &json_obj)) {
+                c1.reset(PyObject_CallObject(json_dumps_obj, args));
+                c2.reset(Py_BuildValue("(O)", c1.get()));
+                py_result = PyArg_ParseTuple(c2.get(), "s", &acl_config);
+            }
+        }
+        if (py_result) {
+            shared_ptr<RequestACL> acl(
+                self->cppobj->load(Element::fromJSON(acl_config)));
+            s_RequestACL* py_acl = static_cast<s_RequestACL*>(
+                requestacl_type.tp_alloc(&requestacl_type, 0));
+            if (py_acl != NULL) {
+                py_acl->cppobj = acl;
+            }
+            return (py_acl);
+        }
+    } catch (const PyCPPWrapperException&) {
+        // If the wrapper utility throws, it's most likely because an invalid
+        // type of argument is passed (and the call to json.dumps() failed
+        // above), rather than a rare case of system errors such as memory
+        // allocation failure.  So we fall through to the end of this function
+        // and raise a TypeError.
+        ;
+    } catch (const exception& ex) {
+        PyErr_SetString(getACLException("LoaderError"), ex.what());
+        return (NULL);
+    } catch (...) {
+        PyErr_SetString(PyExc_SystemError, "Unexpected C++ exception");
+        return (NULL);
+    }
+
+    PyErr_SetString(PyExc_TypeError, "RequestLoader.load() "
+                    "expects str or python representation of JSON");
+    return (NULL);
+}
+
+// This list contains the actual set of functions we have in
+// python. Each entry has
+// 1. Python method name
+// 2. Our static function here
+// 3. Argument type
+// 4. Documentation
+PyMethodDef RequestLoader_methods[] = {
+    { "load", RequestLoader_load, METH_VARARGS, RequestLoader_load_doc },
+    { NULL, NULL, 0, NULL }
+};
+} // end of unnamed namespace
+
+namespace isc {
+namespace acl {
+namespace dns {
+namespace python {
+// This defines the complete type for reflection in python and
+// parsing of PyObject* to s_RequestLoader
+// Most of the functions are not actually implemented and NULL here.
+PyTypeObject requestloader_type = {
+    PyVarObject_HEAD_INIT(NULL, 0)
+    "isc.acl.dns.RequestLoader",
+    sizeof(s_RequestLoader),                 // tp_basicsize
+    0,                                  // tp_itemsize
+    RequestLoader_destroy,       // tp_dealloc
+    NULL,                               // tp_print
+    NULL,                               // tp_getattr
+    NULL,                               // tp_setattr
+    NULL,                               // tp_reserved
+    NULL,                               // tp_repr
+    NULL,                               // tp_as_number
+    NULL,                               // tp_as_sequence
+    NULL,                               // tp_as_mapping
+    NULL,                               // tp_hash
+    NULL,                               // tp_call
+    NULL,                       // tp_str
+    NULL,                               // tp_getattro
+    NULL,                               // tp_setattro
+    NULL,                               // tp_as_buffer
+    Py_TPFLAGS_DEFAULT,                 // tp_flags
+    RequestLoader_doc,
+    NULL,                               // tp_traverse
+    NULL,                               // tp_clear
+    NULL, // tp_richcompare
+    0,                                  // tp_weaklistoffset
+    NULL,                               // tp_iter
+    NULL,                               // tp_iternext
+    RequestLoader_methods,                   // tp_methods
+    NULL,                               // tp_members
+    NULL,                               // tp_getset
+    NULL,                               // tp_base
+    NULL,                               // tp_dict
+    NULL,                               // tp_descr_get
+    NULL,                               // tp_descr_set
+    0,                                  // tp_dictoffset
+    RequestLoader_init,            // tp_init
+    NULL,                               // tp_alloc
+    PyType_GenericNew,                  // tp_new
+    NULL,                               // tp_free
+    NULL,                               // tp_is_gc
+    NULL,                               // tp_bases
+    NULL,                               // tp_mro
+    NULL,                               // tp_cache
+    NULL,                               // tp_subclasses
+    NULL,                               // tp_weaklist
+    NULL,                               // tp_del
+    0                                   // tp_version_tag
+};
+
+bool
+initModulePart_RequestLoader(PyObject* mod) {
+    // We initialize the static description object with PyType_Ready(),
+    // then add it to the module. This is not just a check! (leaving
+    // this out results in segmentation faults)
+    if (PyType_Ready(&requestloader_type) < 0) {
+        return (false);
+    }
+    void* p = &requestloader_type;
+    if (PyModule_AddObject(mod, "RequestLoader",
+                           static_cast<PyObject*>(p)) < 0) {
+        return (false);
+    }
+
+    // Get and hold our own reference to json.dumps() for later use.
+    // Normally it should succeed as __init__.py of the isc.acl package
+    // explicitly imports the json module, and the code below should be
+    // error free (e.g. they don't require memory allocation) under this
+    // condition.
+    // This could still fail with deviant or evil Python code such as those
+    // that first import json and then delete the reference to it from
+    // sys.modules before it imports the acl.dns module.  The RequestLoader
+    // class could still work as long as it doesn't use the JSON decoder,
+    // but we'd rather refuse to import the module than allowing the partially
+    // workable class to keep running.
+    PyObject* json_module = PyImport_AddModule("json");
+    if (json_module != NULL) {
+        PyObject* json_dict = PyModule_GetDict(json_module);
+        if (json_dict != NULL) {
+            json_dumps_obj = PyDict_GetItemString(json_dict, "dumps");
+        }
+    }
+    if (json_dumps_obj != NULL) {
+        Py_INCREF(json_dumps_obj);
+    } else {
+        PyErr_SetString(PyExc_RuntimeError,
+                        "isc.acl.dns.RequestLoader needs the json module, but "
+                        "it's missing");
+        return (false);
+    }
+
+    Py_INCREF(&requestloader_type);
+
+    return (true);
+}
+} // namespace python
+} // namespace dns
+} // namespace acl
+} // namespace isc

src/lib/python/isc/acl/dns_requestloader_python.h

@@ -0,0 +1,46 @@
+// Copyright (C) 2011  Internet Systems Consortium, Inc. ("ISC")
+//
+// Permission to use, copy, modify, and/or distribute this software 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 ISC DISCLAIMS ALL WARRANTIES WITH
+// REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
+// AND FITNESS.  IN NO EVENT SHALL ISC 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.
+
+#ifndef __PYTHON_REQUESTLOADER_H
+#define __PYTHON_REQUESTLOADER_H 1
+
+#include <Python.h>
+
+#include <acl/dns.h>
+
+namespace isc {
+namespace acl {
+namespace dns {
+namespace python {
+
+// The s_* Class simply covers one instantiation of the object
+class s_RequestLoader : public PyObject {
+public:
+    s_RequestLoader();
+    RequestLoader* cppobj;
+};
+
+extern PyTypeObject requestloader_type;
+
+bool initModulePart_RequestLoader(PyObject* mod);
+
+} // namespace python
+} // namespace dns
+} // namespace acl
+} // namespace isc
+#endif // __PYTHON_REQUESTLOADER_H
+
+// Local Variables:
+// mode: c++
+// End:

src/lib/python/isc/acl/dnsacl_inc.cc

@@ -0,0 +1,17 @@
+namespace {
+const char* const dnsacl_doc = "\
+Implementation module for DNS ACL operations\n\n\
+This module provides Python bindings for the C++ classes in the\n\
+isc::acl::dns namespace.  Specifically, it defines Python interfaces of\n\
+handling access control lists (ACLs) with DNS related contexts.\n\
+These bindings are close match to the C++ API, but they are not complete\n\
+(some parts are not needed) and some are done in more python-like ways.\n\
+\n\
+Special objects:\n\
+\n\
+REQUEST_LOADER -- A singleton loader of ACLs. It is expected applications\n\
+  will use this function instead of creating their own loaders, because\n\
+  one is enough, this one will have registered default checks and it is\n\
+  known one, so any plugins can registrer additional checks as well.\n\
+";
+} // unnamed namespace

src/lib/python/isc/acl/tests/Makefile.am

@@ -0,0 +1,30 @@
+PYCOVERAGE_RUN = @PYCOVERAGE_RUN@
+PYTESTS = acl_test.py dns_test.py
+
+EXTRA_DIST = $(PYTESTS)
+
+# If necessary (rare cases), explicitly specify paths to dynamic libraries
+# required by loadable python modules.
+LIBRARY_PATH_PLACEHOLDER =
+if SET_ENV_LIBRARY_PATH
+LIBRARY_PATH_PLACEHOLDER += $(ENV_LIBRARY_PATH)=$(abs_top_builddir)/src/lib/cryptolink/.libs:$(abs_top_builddir)/src/lib/dns/.libs:$(abs_top_builddir)/src/lib/acl/.libs:$(abs_top_builddir)/src/lib/cc/.libs:$(abs_top_builddir)/src/lib/config/.libs:$(abs_top_builddir)/src/lib/log/.libs:$(abs_top_builddir)/src/lib/util/.libs:$(abs_top_builddir)/src/lib/exceptions/.libs:$$$(ENV_LIBRARY_PATH)
+endif
+
+# test using command-line arguments, so use check-local target instead of TESTS
+check-local:
+if ENABLE_PYTHON_COVERAGE
+	touch $(abs_top_srcdir)/.coverage
+	rm -f .coverage
+	${LN_S} $(abs_top_srcdir)/.coverage .coverage
+endif
+	for pytest in $(PYTESTS) ; do \
+	echo Running test: $$pytest ; \
+	env PYTHONPATH=$(abs_top_builddir)/src/lib/isc/python/acl/.libs:$(abs_top_srcdir)/src/lib/python:$(abs_top_builddir)/src/lib/python \
+	$(LIBRARY_PATH_PLACEHOLDER) \
+	$(PYCOVERAGE_RUN) $(abs_srcdir)/$$pytest || exit ; \
+	done
+
+CLEANDIRS = __pycache__
+
+clean-local:
+	rm -rf $(CLEANDIRS)

src/lib/python/isc/acl/tests/acl_test.py

@@ -0,0 +1,29 @@
+# Copyright (C) 2011  Internet Systems Consortium.
+#
+# Permission to use, copy, modify, and distribute this software 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 INTERNET SYSTEMS CONSORTIUM
+# DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL
+# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL
+# INTERNET SYSTEMS CONSORTIUM 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 unittest
+from isc.acl.acl import *
+
+class ACLTest(unittest.TestCase):
+
+    def test_actions(self):
+        # These are simple tests just checking the pre defined actions have
+        # different values
+        self.assertTrue(ACCEPT != REJECT)
+        self.assertTrue(REJECT != DROP)
+        self.assertTrue(DROP != ACCEPT)
+
+if __name__ == '__main__':
+    unittest.main()

src/lib/python/isc/acl/tests/dns_test.py

@@ -0,0 +1,280 @@
+# Copyright (C) 2011  Internet Systems Consortium.
+#
+# Permission to use, copy, modify, and distribute this software 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 INTERNET SYSTEMS CONSORTIUM
+# DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL
+# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL
+# INTERNET SYSTEMS CONSORTIUM 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 unittest
+import socket
+from isc.acl.acl import LoaderError, Error, ACCEPT, REJECT, DROP
+from isc.acl.dns import *
+
+def get_sockaddr(address, port):
+    '''This is a simple shortcut wrapper for getaddrinfo'''
+    ai = socket.getaddrinfo(address, port, 0, socket.SOCK_DGRAM,
+                            socket.IPPROTO_UDP, socket.AI_NUMERICHOST)[0]
+    return ai[4]
+
+def get_acl(prefix):
+    '''This is a simple shortcut for creating an ACL containing single rule
+    that accepts addresses for the given IP prefix (and reject any others
+    by default)
+    '''
+    return REQUEST_LOADER.load('[{"action": "ACCEPT", "from": "' + \
+                                   prefix + '"}]')
+
+def get_acl_json(prefix):
+    '''Same as get_acl, but this function passes a Python representation of
+    JSON to the loader, not a string.'''
+    json = [{"action": "ACCEPT"}]
+    json[0]["from"] = prefix
+    return REQUEST_LOADER.load(json)
+
+def get_context(address):
+    '''This is a simple shortcut wrapper for creating a RequestContext
+    object with a given IP address.  Port number doesn't matter in the test
+    (as of the initial implementation), so it's fixed for simplicity.
+    '''
+    return RequestContext(get_sockaddr(address, 53000))
+
+# These are commonly used RequestContext object
+CONTEXT4 = get_context('192.0.2.1')
+CONTEXT6 = get_context('2001:db8::1')
+
+class RequestContextTest(unittest.TestCase):
+
+    def test_construct(self):
+        # Construct the context from IPv4/IPv6 addresses, check the object
+        # by printing it.
+        self.assertEqual('<isc.acl.dns.RequestContext object, ' + \
+                             'remote_addr=[192.0.2.1]:53001>',
+                         RequestContext(('192.0.2.1', 53001)).__str__())
+        self.assertEqual('<isc.acl.dns.RequestContext object, ' + \
+                             'remote_addr=[2001:db8::1234]:53006>',
+                         RequestContext(('2001:db8::1234', 53006,
+                                         0, 0)).__str__())
+
+        # Unusual case: port number overflows (this constructor allows that,
+        # although it should be rare anyway; the socket address should
+        # normally come from the Python socket module.
+        self.assertEqual('<isc.acl.dns.RequestContext object, ' + \
+                             'remote_addr=[192.0.2.1]:0>',
+                         RequestContext(('192.0.2.1', 65536)).__str__())
+
+        # same test using socket.getaddrinfo() to ensure it accepts the sock
+        # address representation used in the Python socket module.
+        self.assertEqual('<isc.acl.dns.RequestContext object, ' + \
+                             'remote_addr=[192.0.2.1]:53001>',
+                         RequestContext(get_sockaddr('192.0.2.1',
+                                                     53001)).__str__())
+        self.assertEqual('<isc.acl.dns.RequestContext object, ' + \
+                             'remote_addr=[2001:db8::1234]:53006>',
+                         RequestContext(get_sockaddr('2001:db8::1234',
+                                                     53006)).__str__())
+
+        #
+        # Invalid parameters (in our expected usage this should not happen
+        # because the sockaddr would come from the Python socket module, but
+        # validation should still be performed correctly)
+        #
+        # not a tuple
+        self.assertRaises(TypeError, RequestContext, 1)
+        # invalid number of parameters
+        self.assertRaises(TypeError, RequestContext, ('192.0.2.1', 53), 0)
+        # tuple is not in the form of sockaddr
+        self.assertRaises(TypeError, RequestContext, (0, 53))
+        self.assertRaises(TypeError, RequestContext, ('192.0.2.1', 'http'))
+        self.assertRaises(TypeError, RequestContext, ('::', 0, 'flow', 0))
+        # invalid address
+        self.assertRaises(Error, RequestContext, ('example.com', 5300))
+        self.assertRaises(Error, RequestContext, ('192.0.2.1.1', 5300))
+        self.assertRaises(Error, RequestContext, ('2001:db8:::1', 5300))
+
+class RequestACLTest(unittest.TestCase):
+
+    def test_direct_construct(self):
+        self.assertRaises(Error, RequestACL)
+
+    def test_request_loader(self):
+        # these shouldn't raise an exception
+        REQUEST_LOADER.load('[{"action": "DROP"}]')
+        REQUEST_LOADER.load([{"action": "DROP"}])
+        REQUEST_LOADER.load('[{"action": "DROP", "from": "192.0.2.1"}]')
+        REQUEST_LOADER.load([{"action": "DROP", "from": "192.0.2.1"}])
+
+        # Invalid types (note that arguments like '1' or '[]' is of valid
+        # 'type' (but syntax error at a higher level)).  So we need to use
+        # something that is not really JSON nor string.
+        self.assertRaises(TypeError, REQUEST_LOADER.load, b'')
+
+        # Incorrect number of arguments
+        self.assertRaises(TypeError, REQUEST_LOADER.load,
+                          '[{"action": "DROP"}]', 0)
+
+    def test_bad_acl_syntax(self):
+        # the following are derived from loader_test.cc
+        self.assertRaises(LoaderError, REQUEST_LOADER.load, '{}');
+        self.assertRaises(LoaderError, REQUEST_LOADER.load, {});
+        self.assertRaises(LoaderError, REQUEST_LOADER.load, '42');
+        self.assertRaises(LoaderError, REQUEST_LOADER.load, 42);
+        self.assertRaises(LoaderError, REQUEST_LOADER.load, 'true');
+        self.assertRaises(LoaderError, REQUEST_LOADER.load, True);
+        self.assertRaises(LoaderError, REQUEST_LOADER.load, 'null');
+        self.assertRaises(LoaderError, REQUEST_LOADER.load, None);
+        self.assertRaises(LoaderError, REQUEST_LOADER.load, '"hello"');
+        self.assertRaises(LoaderError, REQUEST_LOADER.load, "hello");
+        self.assertRaises(LoaderError, REQUEST_LOADER.load, '[42]');
+        self.assertRaises(LoaderError, REQUEST_LOADER.load, [42]);
+        self.assertRaises(LoaderError, REQUEST_LOADER.load, '["hello"]');
+        self.assertRaises(LoaderError, REQUEST_LOADER.load, ["hello"]);
+        self.assertRaises(LoaderError, REQUEST_LOADER.load, '[[]]');
+        self.assertRaises(LoaderError, REQUEST_LOADER.load, [[]]);
+        self.assertRaises(LoaderError, REQUEST_LOADER.load, '[true]');
+        self.assertRaises(LoaderError, REQUEST_LOADER.load, [True]);
+        self.assertRaises(LoaderError, REQUEST_LOADER.load, '[null]');
+        self.assertRaises(LoaderError, REQUEST_LOADER.load, [None]);
+        self.assertRaises(LoaderError, REQUEST_LOADER.load, '[{}]');
+        self.assertRaises(LoaderError, REQUEST_LOADER.load, [{}]);
+
+        # the following are derived from dns_test.cc
+        self.assertRaises(LoaderError, REQUEST_LOADER.load,
+                          '[{"action": "ACCEPT", "bad": "192.0.2.1"}]')
+        self.assertRaises(LoaderError, REQUEST_LOADER.load,
+                          [{"action": "ACCEPT", "bad": "192.0.2.1"}])
+        self.assertRaises(LoaderError, REQUEST_LOADER.load,
+                          '[{"action": "ACCEPT", "from": 4}]')
+        self.assertRaises(LoaderError, REQUEST_LOADER.load,
+                          [{"action": "ACCEPT", "from": 4}])
+        self.assertRaises(LoaderError, REQUEST_LOADER.load,
+                          '[{"action": "ACCEPT", "from": []}]')
+        self.assertRaises(LoaderError, REQUEST_LOADER.load,
+                          [{"action": "ACCEPT", "from": []}])
+        self.assertRaises(LoaderError, REQUEST_LOADER.load,
+                          '[{"action": "ACCEPT", "from": "bad"}]')
+        self.assertRaises(LoaderError, REQUEST_LOADER.load,
+                          [{"action": "ACCEPT", "from": "bad"}])
+        self.assertRaises(LoaderError, REQUEST_LOADER.load,
+                          '[{"action": "ACCEPT", "from": null}]')
+        self.assertRaises(LoaderError, REQUEST_LOADER.load,
+                          [{"action": "ACCEPT", "from": None}])
+
+    def test_bad_acl_ipsyntax(self):
+        # this test is derived from ip_check_unittest.cc
+        self.assertRaises(LoaderError, REQUEST_LOADER.load,
+                          '[{"action": "DROP", "from": "192.0.2.43/-1"}]')
+        self.assertRaises(LoaderError, REQUEST_LOADER.load,
+                          [{"action": "DROP", "from": "192.0.2.43/-1"}])
+        self.assertRaises(LoaderError, REQUEST_LOADER.load,
+                          '[{"action": "DROP", "from": "192.0.2.43//1"}]')
+        self.assertRaises(LoaderError, REQUEST_LOADER.load,
+                          [{"action": "DROP", "from": "192.0.2.43//1"}])
+        self.assertRaises(LoaderError, REQUEST_LOADER.load,
+                          '[{"action": "DROP", "from": "192.0.2.43/1/"}]')
+        self.assertRaises(LoaderError, REQUEST_LOADER.load,
+                          [{"action": "DROP", "from": "192.0.2.43/1/"}])
+        self.assertRaises(LoaderError, REQUEST_LOADER.load,
+                          '[{"action": "DROP", "from": "/192.0.2.43/1"}]')
+        self.assertRaises(LoaderError, REQUEST_LOADER.load,
+                          [{"action": "DROP", "from": "/192.0.2.43/1"}])
+        self.assertRaises(LoaderError, REQUEST_LOADER.load,
+                          '[{"action": "DROP", "from": "2001:db8::/xxxx"}]')
+        self.assertRaises(LoaderError, REQUEST_LOADER.load,
+                          [{"action": "DROP", "from": "2001:db8::/xxxx"}])
+        self.assertRaises(LoaderError, REQUEST_LOADER.load,
+                          '[{"action": "DROP", "from": "2001:db8::/32/s"}]')
+        self.assertRaises(LoaderError, REQUEST_LOADER.load,
+                          [{"action": "DROP", "from": "2001:db8::/32/s"}])
+        self.assertRaises(LoaderError, REQUEST_LOADER.load,
+                          '[{"action": "DROP", "from": "1/"}]')
+        self.assertRaises(LoaderError, REQUEST_LOADER.load,
+                          [{"action": "DROP", "from": "1/"}])
+        self.assertRaises(LoaderError, REQUEST_LOADER.load,
+                          '[{"action": "DROP", "from": "/1"}]')
+        self.assertRaises(LoaderError, REQUEST_LOADER.load,
+                          [{"action": "DROP", "from": "/1"}])
+        self.assertRaises(LoaderError, REQUEST_LOADER.load,
+                          '[{"action": "DROP", "from": "192.0.2.0/33"}]')
+        self.assertRaises(LoaderError, REQUEST_LOADER.load,
+                          [{"action": "DROP", "from": "192.0.2.0/33"}])
+        self.assertRaises(LoaderError, REQUEST_LOADER.load,
+                          '[{"action": "DROP", "from": "::1/129"}]')
+        self.assertRaises(LoaderError, REQUEST_LOADER.load,
+                          [{"action": "DROP", "from": "::1/129"}])
+
+    def test_execute(self):
+        # tests derived from dns_test.cc.  We don't directly expose checks
+        # in the python wrapper, so we test it via execute().
+        self.assertEqual(ACCEPT, get_acl('192.0.2.1').execute(CONTEXT4))
+        self.assertEqual(ACCEPT, get_acl_json('192.0.2.1').execute(CONTEXT4))
+        self.assertEqual(REJECT, get_acl('192.0.2.53').execute(CONTEXT4))
+        self.assertEqual(REJECT, get_acl_json('192.0.2.53').execute(CONTEXT4))
+        self.assertEqual(ACCEPT, get_acl('192.0.2.0/24').execute(CONTEXT4))
+        self.assertEqual(ACCEPT, get_acl_json('192.0.2.0/24').execute(CONTEXT4))
+        self.assertEqual(REJECT, get_acl('192.0.1.0/24').execute(CONTEXT4))
+        self.assertEqual(REJECT, get_acl_json('192.0.1.0/24').execute(CONTEXT4))
+        self.assertEqual(REJECT, get_acl('192.0.1.0/24').execute(CONTEXT4))
+        self.assertEqual(REJECT, get_acl_json('192.0.1.0/24').execute(CONTEXT4))
+
+        self.assertEqual(ACCEPT, get_acl('2001:db8::1').execute(CONTEXT6))
+        self.assertEqual(ACCEPT, get_acl_json('2001:db8::1').execute(CONTEXT6))
+        self.assertEqual(REJECT, get_acl('2001:db8::53').execute(CONTEXT6))
+        self.assertEqual(REJECT, get_acl_json('2001:db8::53').execute(CONTEXT6))
+        self.assertEqual(ACCEPT, get_acl('2001:db8::/64').execute(CONTEXT6))
+        self.assertEqual(ACCEPT,
+                         get_acl_json('2001:db8::/64').execute(CONTEXT6))
+        self.assertEqual(REJECT, get_acl('2001:db8:1::/64').execute(CONTEXT6))
+        self.assertEqual(REJECT,
+                         get_acl_json('2001:db8:1::/64').execute(CONTEXT6))
+        self.assertEqual(REJECT, get_acl('32.1.13.184').execute(CONTEXT6))
+        self.assertEqual(REJECT, get_acl_json('32.1.13.184').execute(CONTEXT6))
+
+        # A bit more complicated example, derived from resolver_config_unittest
+        acl = REQUEST_LOADER.load('[ {"action": "ACCEPT", ' +
+                                  '     "from": "192.0.2.1"},' +
+                                  '    {"action": "REJECT",' +
+                                  '     "from": "192.0.2.0/24"},' +
+                                  '    {"action": "DROP",' +
+                                  '     "from": "2001:db8::1"},' +
+                                  '] }')
+        self.assertEqual(ACCEPT, acl.execute(CONTEXT4))
+        self.assertEqual(REJECT, acl.execute(get_context('192.0.2.2')))
+        self.assertEqual(DROP, acl.execute(get_context('2001:db8::1')))
+        self.assertEqual(REJECT, acl.execute(get_context('2001:db8::2')))
+
+        # same test using the JSON representation
+        acl = REQUEST_LOADER.load([{"action": "ACCEPT", "from": "192.0.2.1"},
+                                   {"action": "REJECT",
+                                    "from": "192.0.2.0/24"},
+                                   {"action": "DROP", "from": "2001:db8::1"}])
+        self.assertEqual(ACCEPT, acl.execute(CONTEXT4))
+        self.assertEqual(REJECT, acl.execute(get_context('192.0.2.2')))
+        self.assertEqual(DROP, acl.execute(get_context('2001:db8::1')))
+        self.assertEqual(REJECT, acl.execute(get_context('2001:db8::2')))
+
+    def test_bad_execute(self):
+        acl = get_acl('192.0.2.1')
+        # missing parameter
+        self.assertRaises(TypeError, acl.execute)
+        # too many parameters
+        self.assertRaises(TypeError, acl.execute, get_context('192.0.2.2'), 0)
+        # type mismatch
+        self.assertRaises(TypeError, acl.execute, 'bad parameter')
+
+class RequestLoaderTest(unittest.TestCase):
+    # Note: loading ACLs is tested in other test cases.
+
+    def test_construct(self):
+        # at least for now, we don't allow direct construction.
+        self.assertRaises(Error, RequestLoader)
+
+if __name__ == '__main__':
+    unittest.main()

src/lib/util/python/pycppwrapper_util.h

@@ -94,6 +94,22 @@ public:
 /// the reference to be decreased, the original bare pointer should be
 /// extracted using the \c release() method.
 ///
+/// In some other cases, it would be convenient if it's possible to create
+/// an "empty" container and reset it with a Python object later.
+/// For example, we may want to create a temporary Python object in the
+/// middle of a function and make sure that it's valid within the rest of
+/// the function scope, while we want to make sure its reference is released
+/// when the function returns (either normally or as a result of exception).
+/// To allow this scenario, this class defines the default constructor
+/// and the \c reset() method.  The default constructor allows the class
+/// object with an "empty" (NULL) Python object, while \c reset() allows
+/// the stored object to be replaced with a new one.  If there's a valid
+/// object was already set, \c reset() releases its reference.
+/// In general, it's safer to construct the container object with a valid
+/// Python object pointer.  The use of the default constructor and
+/// \c reset() should therefore be restricted to cases where it's
+/// absolutely necessary.
+///
 /// There are two convenience methods for commonly used operations:
 /// \c installAsClassVariable() to add the PyObject as a class variable
 /// and \c installToModule to add the PyObject to a specified python module.
@@ -166,16 +182,27 @@ public:
 /// exception in a python biding written in C/C++.  See the code comment
 /// of the method for more details.
 struct PyObjectContainer {
+    PyObjectContainer() : obj_(NULL) {}
     PyObjectContainer(PyObject* obj) : obj_(obj) {
         if (obj_ == NULL) {
             isc_throw(PyCPPWrapperException, "Unexpected NULL PyObject, "
                       "probably due to short memory");
         }
     }
-    virtual ~PyObjectContainer() {
+    ~PyObjectContainer() {
+        if (obj_ != NULL) {
+            Py_DECREF(obj_);
+        }
+    }
+    void reset(PyObject* obj) {
+        if (obj == NULL) {
+            isc_throw(PyCPPWrapperException, "Unexpected NULL PyObject, "
+                      "probably due to short memory");
+        }
         if (obj_ != NULL) {
             Py_DECREF(obj_);
         }
+        obj_ = obj;
     }
     PyObject* get() {
         return (obj_);

src/lib/util/python/wrapper_template.cc

@@ -210,7 +210,7 @@ namespace python {
 // Most of the functions are not actually implemented and NULL here.
 PyTypeObject @cppclass@_type = {
     PyVarObject_HEAD_INIT(NULL, 0)
-    "pydnspp.@CPPCLASS@",
+    "@MODULE@.@CPPCLASS@",
     sizeof(s_@CPPCLASS@),                 // tp_basicsize
     0,                                  // tp_itemsize
     reinterpret_cast<destructor>(@CPPCLASS@_destroy),       // tp_dealloc
@@ -222,7 +222,7 @@ PyTypeObject @cppclass@_type = {
     NULL,                               // tp_as_number
     NULL,                               // tp_as_sequence
     NULL,                               // tp_as_mapping
-    NULL,                               // tp_hash 
+    NULL,                               // tp_hash
     NULL,                               // tp_call
     // THIS MAY HAVE TO BE CHANGED TO NULL:
     @CPPCLASS@_str,                       // tp_str