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 "lib/replace/system/python.h"
  27 #include "ldb.h"
  28 #include "pyldb.h"
  29
  30 static PyObject *ldb_module = NULL;
  31
  32 /**
  33  * Find out PyTypeObject in ldb module for a given typename
  34  */
  35 static PyTypeObject * PyLdb_GetPyType(const char *typename)
  36 {
  37         PyTypeObject *type = NULL;
  38         bool ok;
  39
  40         if (ldb_module == NULL) {
  41                 ldb_module = PyImport_ImportModule("ldb");
  42                 if (ldb_module == NULL) {
  43                         return NULL;
  44                 }
  45         }
  46
  47         type = (PyTypeObject *)PyObject_GetAttrString(ldb_module, typename);
  48
  49
  50         if (type == NULL) {
  51                 PyErr_Format(PyExc_NameError,
  52                              "Unable to find type %s in ldb module",
  53                              typename);
  54                 return NULL;
  55         }
  56
  57         ok = PyType_Check(type);
  58         if (! ok) {
  59                 PyErr_Format(PyExc_TypeError,
  60                              "Expected type ldb.%s, not %s",
  61                              typename, Py_TYPE(type)->tp_name);
  62                 Py_DECREF(type);
  63                 return NULL;
  64         }
  65
  66         return type;
  67 }
  68
  69 bool pyldb_check_type(PyObject *obj, const char *typename)
  70 {
  71         bool ok = false;
  72         PyTypeObject *type = PyLdb_GetPyType(typename);
  73         if (type != NULL) {
  74                 ok = PyObject_TypeCheck(obj, type);
  75                 Py_DECREF(type);
  76         }
  77         return ok;
  78 }
  79
  80 /**
  81  * Obtain a ldb DN from a Python object.
  82  *
  83  * @param mem_ctx Memory context
  84  * @param object Python object
  85  * @param ldb_ctx LDB context
  86  * @return Whether or not the conversion succeeded
  87  */
  88 bool pyldb_Object_AsDn(TALLOC_CTX *mem_ctx, PyObject *object,
  89                    struct ldb_context *ldb_ctx, struct ldb_dn **dn)
  90 {
  91         struct ldb_dn *odn;
  92         PyTypeObject *PyLdb_Dn_Type;
  93         bool is_dn;
  94
  95         if (ldb_ctx != NULL && (PyUnicode_Check(object))) {
  96                 const char *odn_str = NULL;
  97
  98                 odn_str = PyUnicode_AsUTF8(object);
  99                 if (odn_str == NULL) {
 100                         return false;
 101                 }
 102
 103                 odn = ldb_dn_new(mem_ctx, ldb_ctx, odn_str);
 104                 if (odn == NULL) {
 105                         PyErr_NoMemory();
 106                         return false;
 107                 }
 108
 109                 *dn = odn;
 110                 return true;
 111         }
 112
 113         if (ldb_ctx != NULL && PyBytes_Check(object)) {
 114                 const char *odn_str = NULL;
 115
 116                 odn_str = PyBytes_AsString(object);
 117                 if (odn_str == NULL) {
 118                         return false;
 119                 }
 120
 121                 odn = ldb_dn_new(mem_ctx, ldb_ctx, odn_str);
 122                 if (odn == NULL) {
 123                         PyErr_NoMemory();
 124                         return false;
 125                 }
 126
 127                 *dn = odn;
 128                 return true;
 129         }
 130
 131         PyLdb_Dn_Type = PyLdb_GetPyType("Dn");
 132         if (PyLdb_Dn_Type == NULL) {
 133                 PyErr_SetString(PyExc_TypeError, "Expected DN");
 134                 return false;
 135         }
 136
 137         is_dn = PyObject_TypeCheck(object, PyLdb_Dn_Type);
 138         Py_DECREF(PyLdb_Dn_Type);
 139         if (is_dn) {
 140                 *dn = pyldb_Dn_AS_DN(object);
 141                 return true;
 142         }
 143
 144         PyErr_SetString(PyExc_TypeError, "Expected DN");
 145         return false;
 146 }
 147
 148 PyObject *pyldb_Dn_FromDn(struct ldb_dn *dn, PyLdbObject *pyldb)
 149 {
 150         TALLOC_CTX *mem_ctx = NULL;
 151         struct ldb_dn *dn_ref = NULL;
 152         PyLdbDnObject *py_ret;
 153         PyTypeObject *PyLdb_Dn_Type;
 154
 155         if (dn == NULL) {
 156                 Py_RETURN_NONE;
 157         }
 158
 159         mem_ctx = talloc_new(NULL);
 160         if (mem_ctx == NULL) {
 161                 return PyErr_NoMemory();
 162         }
 163
 164         dn_ref = talloc_reference(mem_ctx, dn);
 165         if (dn_ref == NULL) {
 166                 talloc_free(mem_ctx);
 167                 return PyErr_NoMemory();
 168         }
 169
 170         PyLdb_Dn_Type = PyLdb_GetPyType("Dn");
 171         if (PyLdb_Dn_Type == NULL) {
 172                 talloc_free(mem_ctx);
 173                 return NULL;
 174         }
 175
 176         py_ret = (PyLdbDnObject *)PyLdb_Dn_Type->tp_alloc(PyLdb_Dn_Type, 0);
 177         Py_DECREF(PyLdb_Dn_Type);
 178         if (py_ret == NULL) {
 179                 talloc_free(mem_ctx);
 180                 PyErr_NoMemory();
 181                 return NULL;
 182         }
 183         py_ret->mem_ctx = mem_ctx;
 184         py_ret->dn = dn;
 185         py_ret->pyldb = pyldb;
 186
 187         Py_INCREF(py_ret->pyldb);
 188         return (PyObject *)py_ret;
 189 }
 190
 191 void PyErr_SetLdbError(PyObject *error, int ret, struct ldb_context *ldb_ctx)
 192 {
 193         PyObject *exc = NULL;
 194         const char *ldb_error_string = NULL;
 195
 196         if (ret == LDB_ERR_PYTHON_EXCEPTION) {
 197                 return; /* Python exception should already be set, just keep that */
 198         }
 199
 200         if (ldb_ctx != NULL) {
 201                 ldb_error_string = ldb_errstring(ldb_ctx);
 202         }
 203         /* either no LDB context, no string stored or string reset */
 204         if (ldb_error_string == NULL) {
 205                 ldb_error_string = ldb_strerror(ret);
 206         }
 207
 208         exc = Py_BuildValue("(i,s)", ret, ldb_error_string);
 209         if (exc == NULL) {
 210                 /*
 211                  * Py_BuildValue failed, and will have set its own exception.
 212                  * It isn't the one we wanted, but it will have to do.
 213                  * This is all very unexpected.
 214                  */
 215                 fprintf(stderr, "could not make LdbError %d!\n", ret);
 216                 return;
 217         }
 218         PyErr_SetObject(error, exc);
 219         Py_DECREF(exc);
 220 }