source: trunk/server/source4/lib/ldb/pyldb_util.c

/*
   Unix SMB/CIFS implementation.

   Python interface to ldb - utility functions.

   Copyright (C) 2007-2010 Jelmer Vernooij <jelmer@samba.org>

         ** NOTE! The following LGPL license applies to the ldb
         ** library. This does NOT imply that all of Samba is released
         ** under the LGPL

   This library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Lesser General Public
   License as published by the Free Software Foundation; either
   version 3 of the License, or (at your option) any later version.

   This library is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public
   License along with this library; if not, see <http://www.gnu.org/licenses/>.
*/

#include <Python.h>
#include "ldb.h"
#include "pyldb.h"

static PyObject *ldb_module = NULL;

/* There's no Py_ssize_t in 2.4, apparently */
#if PY_MAJOR_VERSION == 2 && PY_MINOR_VERSION < 5
typedef int Py_ssize_t;
typedef inquiry lenfunc;
typedef intargfunc ssizeargfunc;
#endif

#ifndef Py_RETURN_NONE
#define Py_RETURN_NONE return Py_INCREF(Py_None), Py_None
#endif


/**
 * Find out PyTypeObject in ldb module for a given typename
 */
static PyTypeObject * PyLdb_GetPyType(const char *typename)
{
        PyObject *py_obj = NULL;

        if (ldb_module == NULL) {
                ldb_module = PyImport_ImportModule("ldb");
                if (ldb_module == NULL) {
                        return NULL;
                }
        }

        py_obj = PyObject_GetAttrString(ldb_module, typename);

        return (PyTypeObject*)py_obj;
}

/**
 * Obtain a ldb DN from a Python object.
 *
 * @param mem_ctx Memory context
 * @param object Python object
 * @param ldb_ctx LDB context
 * @return Whether or not the conversion succeeded
 */
bool PyObject_AsDn(TALLOC_CTX *mem_ctx, PyObject *object, 
                   struct ldb_context *ldb_ctx, struct ldb_dn **dn)
{
        struct ldb_dn *odn;
        PyTypeObject *PyLdb_Dn_Type;

        if (ldb_ctx != NULL && PyString_Check(object)) {
                odn = ldb_dn_new(mem_ctx, ldb_ctx, PyString_AsString(object));
                *dn = odn;
                return true;
        }

        PyLdb_Dn_Type = PyLdb_GetPyType("Dn");
        if (PyLdb_Dn_Type == NULL) {
                return false;
        }

        if (PyObject_TypeCheck(object, PyLdb_Dn_Type)) {
                *dn = PyLdbDn_AsDn(object);
                return true;
        }

        PyErr_SetString(PyExc_TypeError, "Expected DN");
        return false;
}

PyObject *PyLdbDn_FromDn(struct ldb_dn *dn)
{
        PyLdbDnObject *py_ret;
        PyTypeObject *PyLdb_Dn_Type;

        if (dn == NULL) {
                Py_RETURN_NONE;
        }

        PyLdb_Dn_Type = PyLdb_GetPyType("Dn");
        if (PyLdb_Dn_Type == NULL) {
                return NULL;
        }

        py_ret = (PyLdbDnObject *)PyLdb_Dn_Type->tp_alloc(PyLdb_Dn_Type, 0);
        if (py_ret == NULL) {
                PyErr_NoMemory();
                return NULL;
        }
        py_ret->mem_ctx = talloc_new(NULL);
        py_ret->dn = talloc_reference(py_ret->mem_ctx, dn);
        return (PyObject *)py_ret;
}