lib/ldb/pyldb_util.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3
   4    Python interface to ldb - utility functions.
   5
   6    Copyright (C) 2007-2010 Jelmer Vernooij <jelmer@samba.org>
   7
   8          ** NOTE! The following LGPL license applies to the ldb
   9          ** library. This does NOT imply that all of Samba is released
  10          ** under the LGPL
  11
  12    This library is free software; you can redistribute it and/or
  13    modify it under the terms of the GNU Lesser General Public
  14    License as published by the Free Software Foundation; either
  15    version 3 of the License, or (at your option) any later version.
  16
  17    This library is distributed in the hope that it will be useful,
  18    but WITHOUT ANY WARRANTY; without even the implied warranty of
  19    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  20    Lesser General Public License for more details.
  21
  22    You should have received a copy of the GNU Lesser General Public
  23    License along with this library; if not, see <http://www.gnu.org/licenses/>.
  24 */
  25
  26 #include <Python.h>
  27 #include "ldb.h"
  28 #include "pyldb.h"
  29
  30 static PyObject *ldb_module = NULL;
  31
  32 /* There's no Py_ssize_t in 2.4, apparently */
  33 #if PY_MAJOR_VERSION == 2 && PY_MINOR_VERSION < 5
  34 typedef int Py_ssize_t;
  35 typedef inquiry lenfunc;
  36 typedef intargfunc ssizeargfunc;
  37 #endif
  38
  39 #ifndef Py_RETURN_NONE
  40 #define Py_RETURN_NONE return Py_INCREF(Py_None), Py_None
  41 #endif
  42
  43
  44 /**
  45  * Find out PyTypeObject in ldb module for a given typename
  46  */
  47 static PyTypeObject * PyLdb_GetPyType(const char *typename)
  48 {
  49         PyObject *py_obj = NULL;
  50
  51         if (ldb_module == NULL) {
  52                 ldb_module = PyImport_ImportModule("ldb");
  53                 if (ldb_module == NULL) {
  54                         return NULL;
  55                 }
  56         }
  57
  58         py_obj = PyObject_GetAttrString(ldb_module, typename);
  59
  60         return (PyTypeObject*)py_obj;
  61 }
  62
  63 /**
  64  * Obtain a ldb DN from a Python object.
  65  *
  66  * @param mem_ctx Memory context
  67  * @param object Python object
  68  * @param ldb_ctx LDB context
  69  * @return Whether or not the conversion succeeded
  70  */
  71 bool pyldb_Object_AsDn(TALLOC_CTX *mem_ctx, PyObject *object,
  72                    struct ldb_context *ldb_ctx, struct ldb_dn **dn)
  73 {
  74         struct ldb_dn *odn;
  75         PyTypeObject *PyLdb_Dn_Type;
  76
  77         if (ldb_ctx != NULL && PyString_Check(object)) {
  78                 odn = ldb_dn_new(mem_ctx, ldb_ctx, PyString_AsString(object));
  79                 *dn = odn;
  80                 return true;
  81         }
  82
  83         PyLdb_Dn_Type = PyLdb_GetPyType("Dn");
  84         if (PyLdb_Dn_Type == NULL) {
  85                 return false;
  86         }
  87
  88         if (PyObject_TypeCheck(object, PyLdb_Dn_Type)) {
  89                 *dn = pyldb_Dn_AsDn(object);
  90                 return true;
  91         }
  92
  93         PyErr_SetString(PyExc_TypeError, "Expected DN");
  94         return false;
  95 }
  96
  97 PyObject *pyldb_Dn_FromDn(struct ldb_dn *dn)
  98 {
  99         PyLdbDnObject *py_ret;
 100         PyTypeObject *PyLdb_Dn_Type;
 101
 102         if (dn == NULL) {
 103                 Py_RETURN_NONE;
 104         }
 105
 106         PyLdb_Dn_Type = PyLdb_GetPyType("Dn");
 107         if (PyLdb_Dn_Type == NULL) {
 108                 return NULL;
 109         }
 110
 111         py_ret = (PyLdbDnObject *)PyLdb_Dn_Type->tp_alloc(PyLdb_Dn_Type, 0);
 112         if (py_ret == NULL) {
 113                 PyErr_NoMemory();
 114                 return NULL;
 115         }
 116         py_ret->mem_ctx = talloc_new(NULL);
 117         py_ret->dn = talloc_reference(py_ret->mem_ctx, dn);
 118         return (PyObject *)py_ret;
 119 }