source4/param/pyparam.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    Samba utility functions
   4    Copyright (C) Jelmer Vernooij <jelmer@samba.org> 2007-2008
   5
   6    This program is free software; you can redistribute it and/or modify
   7    it under the terms of the GNU General Public License as published by
   8    the Free Software Foundation; either version 3 of the License, or
   9    (at your option) any later version.
  10
  11    This program is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14    GNU General Public License for more details.
  15
  16    You should have received a copy of the GNU General Public License
  17    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  18 */
  19
  20 #include <stdint.h>
  21 #include <stdbool.h>
  22
  23 #include "includes.h"
  24 #include "param/param.h"
  25 #include "param/loadparm.h"
  26 #include <Python.h>
  27 #include "pytalloc.h"
  28
  29 /* There's no Py_ssize_t in 2.4, apparently */
  30 #if PY_MAJOR_VERSION == 2 && PY_MINOR_VERSION < 5
  31 typedef int Py_ssize_t;
  32 typedef inquiry lenfunc;
  33 #endif
  34
  35 #ifndef Py_RETURN_NONE
  36 #define Py_RETURN_NONE return Py_INCREF(Py_None), Py_None
  37 #endif
  38
  39 #define PyLoadparmContext_AsLoadparmContext(obj) py_talloc_get_type(obj, struct loadparm_context)
  40
  41 PyAPI_DATA(PyTypeObject) PyLoadparmContext;
  42 PyAPI_DATA(PyTypeObject) PyLoadparmService;
  43
  44 PyObject *PyLoadparmService_FromService(struct loadparm_service *service)
  45 {
  46         return py_talloc_reference(&PyLoadparmService, service);
  47 }
  48
  49 static PyObject *py_lp_ctx_get_helper(struct loadparm_context *lp_ctx, const char *service_name, const char *param_name)
  50 {
  51     struct parm_struct *parm = NULL;
  52     void *parm_ptr = NULL;
  53     int i;
  54
  55     if (service_name != NULL) {
  56         struct loadparm_service *service;
  57         /* its a share parameter */
  58         service = lp_service(lp_ctx, service_name);
  59         if (service == NULL) {
  60             return NULL;
  61         }
  62         if (strchr(param_name, ':')) {
  63             /* its a parametric option on a share */
  64             const char *type = talloc_strndup(lp_ctx,
  65                               param_name,
  66                               strcspn(param_name, ":"));
  67             const char *option = strchr(param_name, ':') + 1;
  68             const char *value;
  69             if (type == NULL || option == NULL) {
  70                 return NULL;
  71             }
  72             value = lp_get_parametric(lp_ctx, service, type, option);
  73             if (value == NULL) {
  74                 return NULL;
  75             }
  76             return PyString_FromString(value);
  77         }
  78
  79         parm = lp_parm_struct(param_name);
  80         if (parm == NULL || parm->pclass == P_GLOBAL) {
  81             return NULL;
  82         }
  83         parm_ptr = lp_parm_ptr(lp_ctx, service, parm);
  84     } else if (strchr(param_name, ':')) {
  85         /* its a global parametric option */
  86         const char *type = talloc_strndup(lp_ctx,
  87                           param_name, strcspn(param_name, ":"));
  88         const char *option = strchr(param_name, ':') + 1;
  89         const char *value;
  90         if (type == NULL || option == NULL) {
  91             return NULL;
  92         }
  93         value = lp_get_parametric(lp_ctx, NULL, type, option);
  94         if (value == NULL)
  95             return NULL;
  96         return PyString_FromString(value);
  97     } else {
  98         /* its a global parameter */
  99         parm = lp_parm_struct(param_name);
 100         if (parm == NULL) {
 101             return NULL;
 102         }
 103         parm_ptr = lp_parm_ptr(lp_ctx, NULL, parm);
 104     }
 105
 106     if (parm == NULL || parm_ptr == NULL) {
 107         return NULL;
 108     }
 109
 110     /* construct and return the right type of python object */
 111     switch (parm->type) {
 112     case P_STRING:
 113     case P_USTRING:
 114         return PyString_FromString(*(char **)parm_ptr);
 115     case P_BOOL:
 116         return PyBool_FromLong(*(bool *)parm_ptr);
 117     case P_INTEGER:
 118     case P_OCTAL:
 119     case P_BYTES:
 120         return PyLong_FromLong(*(int *)parm_ptr);
 121     case P_ENUM:
 122         for (i=0; parm->enum_list[i].name; i++) {
 123             if (*(int *)parm_ptr == parm->enum_list[i].value) {
 124                 return PyString_FromString(parm->enum_list[i].name);
 125             }
 126         }
 127         return NULL;
 128     case P_LIST:
 129         {
 130             int j;
 131             const char **strlist = *(const char ***)parm_ptr;
 132             PyObject *pylist;
 133
 134                 if(strlist == NULL) {
 135                         return PyList_New(0);
 136                 }
 137
 138                 pylist = PyList_New(str_list_length(strlist));
 139             for (j = 0; strlist[j]; j++)
 140                 PyList_SetItem(pylist, j,
 141                                PyString_FromString(strlist[j]));
 142             return pylist;
 143         }
 144
 145         break;
 146     }
 147     return NULL;
 148
 149 }
 150
 151 static PyObject *py_lp_ctx_load(py_talloc_Object *self, PyObject *args)
 152 {
 153         char *filename;
 154         bool ret;
 155         if (!PyArg_ParseTuple(args, "s", &filename))
 156                 return NULL;
 157
 158         ret = lp_load(PyLoadparmContext_AsLoadparmContext(self), filename);
 159
 160         if (!ret) {
 161                 PyErr_Format(PyExc_RuntimeError, "Unable to load file %s", filename);
 162                 return NULL;
 163         }
 164         Py_RETURN_NONE;
 165 }
 166
 167 static PyObject *py_lp_ctx_load_default(py_talloc_Object *self)
 168 {
 169         bool ret;
 170         ret = lp_load_default(PyLoadparmContext_AsLoadparmContext(self));
 171
 172         if (!ret) {
 173                 PyErr_SetString(PyExc_RuntimeError, "Unable to load default file");
 174                 return NULL;
 175         }
 176         Py_RETURN_NONE;
 177 }
 178
 179 static PyObject *py_lp_ctx_get(py_talloc_Object *self, PyObject *args)
 180 {
 181         char *param_name;
 182         char *section_name = NULL;
 183         PyObject *ret;
 184         if (!PyArg_ParseTuple(args, "s|s", &param_name, &section_name))
 185                 return NULL;
 186
 187         ret = py_lp_ctx_get_helper(PyLoadparmContext_AsLoadparmContext(self), section_name, param_name);
 188         if (ret == NULL)
 189                 Py_RETURN_NONE;
 190         return ret;
 191 }
 192
 193 static PyObject *py_lp_ctx_is_myname(py_talloc_Object *self, PyObject *args)
 194 {
 195         char *name;
 196         if (!PyArg_ParseTuple(args, "s", &name))
 197                 return NULL;
 198
 199         return PyBool_FromLong(lp_is_myname(PyLoadparmContext_AsLoadparmContext(self), name));
 200 }
 201
 202 static PyObject *py_lp_ctx_is_mydomain(py_talloc_Object *self, PyObject *args)
 203 {
 204         char *name;
 205         if (!PyArg_ParseTuple(args, "s", &name))
 206                 return NULL;
 207
 208         return PyBool_FromLong(lp_is_mydomain(PyLoadparmContext_AsLoadparmContext(self), name));
 209 }
 210
 211 static PyObject *py_lp_ctx_set(py_talloc_Object *self, PyObject *args)
 212 {
 213         char *name, *value;
 214         bool ret;
 215         if (!PyArg_ParseTuple(args, "ss", &name, &value))
 216                 return NULL;
 217
 218         ret = lp_set_cmdline(PyLoadparmContext_AsLoadparmContext(self), name, value);
 219         if (!ret) {
 220                 PyErr_SetString(PyExc_RuntimeError, "Unable to set parameter");
 221                 return NULL;
 222         }
 223
 224         Py_RETURN_NONE;
 225 }
 226
 227 static PyObject *py_lp_ctx_private_path(py_talloc_Object *self, PyObject *args)
 228 {
 229         char *name, *path;
 230         PyObject *ret;
 231         if (!PyArg_ParseTuple(args, "s", &name))
 232                 return NULL;
 233
 234         path = private_path(NULL, PyLoadparmContext_AsLoadparmContext(self), name);
 235         ret = PyString_FromString(path);
 236         talloc_free(path);
 237
 238         return ret;
 239 }
 240
 241 static PyObject *py_lp_ctx_services(py_talloc_Object *self)
 242 {
 243         struct loadparm_context *lp_ctx = PyLoadparmContext_AsLoadparmContext(self);
 244         PyObject *ret;
 245         int i;
 246         ret = PyList_New(lp_numservices(lp_ctx));
 247         for (i = 0; i < lp_numservices(lp_ctx); i++) {
 248                 struct loadparm_service *service = lp_servicebynum(lp_ctx, i);
 249                 if (service != NULL) {
 250                         PyList_SetItem(ret, i, PyString_FromString(lp_servicename(service)));
 251                 }
 252         }
 253         return ret;
 254 }
 255
 256 static PyMethodDef py_lp_ctx_methods[] = {
 257         { "load", (PyCFunction)py_lp_ctx_load, METH_VARARGS,
 258                 "S.load(filename) -> None\n"
 259                 "Load specified file." },
 260         { "load_default", (PyCFunction)py_lp_ctx_load_default, METH_NOARGS,
 261                 "S.load_default() -> None\n"
 262                 "Load default smb.conf file." },
 263         { "is_myname", (PyCFunction)py_lp_ctx_is_myname, METH_VARARGS,
 264                 "S.is_myname(name) -> bool\n"
 265                 "Check whether the specified name matches one of our netbios names." },
 266         { "is_mydomain", (PyCFunction)py_lp_ctx_is_mydomain, METH_VARARGS,
 267                 "S.is_mydomain(name) -> bool\n"
 268                 "Check whether the specified name matches our domain name." },
 269         { "get", (PyCFunction)py_lp_ctx_get, METH_VARARGS,
 270                 "S.get(name, service_name) -> value\n"
 271                 "Find specified parameter." },
 272         { "set", (PyCFunction)py_lp_ctx_set, METH_VARARGS,
 273                 "S.set(name, value) -> bool\n"
 274                 "Change a parameter." },
 275         { "private_path", (PyCFunction)py_lp_ctx_private_path, METH_VARARGS,
 276                 "S.private_path(name) -> path\n" },
 277         { "services", (PyCFunction)py_lp_ctx_services, METH_NOARGS,
 278                 "S.services() -> list" },
 279         { NULL }
 280 };
 281
 282 static PyObject *py_lp_ctx_default_service(py_talloc_Object *self, void *closure)
 283 {
 284         return PyLoadparmService_FromService(lp_default_service(PyLoadparmContext_AsLoadparmContext(self)));
 285 }
 286
 287 static PyObject *py_lp_ctx_config_file(py_talloc_Object *self, void *closure)
 288 {
 289         const char *configfile = lp_configfile(PyLoadparmContext_AsLoadparmContext(self));
 290         if (configfile == NULL)
 291                 Py_RETURN_NONE;
 292         else
 293                 return PyString_FromString(configfile);
 294 }
 295
 296 static PyGetSetDef py_lp_ctx_getset[] = {
 297         { discard_const_p(char, "default_service"), (getter)py_lp_ctx_default_service, NULL, NULL },
 298         { discard_const_p(char, "configfile"), (getter)py_lp_ctx_config_file, NULL,
 299           discard_const_p(char, "Name of last config file that was loaded.") },
 300         { NULL }
 301 };
 302
 303 static PyObject *py_lp_ctx_new(PyTypeObject *type, PyObject *args, PyObject *kwargs)
 304 {
 305         py_talloc_Object *ret = (py_talloc_Object *)type->tp_alloc(type, 0);
 306         if (ret == NULL) {
 307                 PyErr_NoMemory();
 308                 return NULL;
 309         }
 310         ret->talloc_ctx = talloc_new(NULL);
 311         if (ret->talloc_ctx == NULL) {
 312                 PyErr_NoMemory();
 313                 return NULL;
 314         }
 315         ret->ptr = loadparm_init(ret->talloc_ctx);
 316         return (PyObject *)ret;
 317 }
 318
 319 static Py_ssize_t py_lp_ctx_len(py_talloc_Object *self)
 320 {
 321         return lp_numservices(PyLoadparmContext_AsLoadparmContext(self));
 322 }
 323
 324 static PyObject *py_lp_ctx_getitem(py_talloc_Object *self, PyObject *name)
 325 {
 326         struct loadparm_service *service;
 327         if (!PyString_Check(name)) {
 328                 PyErr_SetString(PyExc_TypeError, "Only string subscripts are supported");
 329                 return NULL;
 330         }
 331         service = lp_service(PyLoadparmContext_AsLoadparmContext(self), PyString_AsString(name));
 332         if (service == NULL) {
 333                 PyErr_SetString(PyExc_KeyError, "No such section");
 334                 return NULL;
 335         }
 336         return PyLoadparmService_FromService(service);
 337 }
 338
 339 static PyMappingMethods py_lp_ctx_mapping = {
 340         .mp_length = (lenfunc)py_lp_ctx_len,
 341         .mp_subscript = (binaryfunc)py_lp_ctx_getitem,
 342 };
 343
 344 PyTypeObject PyLoadparmContext = {
 345         .tp_name = "LoadParm",
 346         .tp_basicsize = sizeof(py_talloc_Object),
 347         .tp_dealloc = py_talloc_dealloc,
 348         .tp_getset = py_lp_ctx_getset,
 349         .tp_methods = py_lp_ctx_methods,
 350         .tp_new = py_lp_ctx_new,
 351         .tp_as_mapping = &py_lp_ctx_mapping,
 352         .tp_flags = Py_TPFLAGS_DEFAULT,
 353 };
 354
 355 PyTypeObject PyLoadparmService = {
 356         .tp_name = "LoadparmService",
 357         .tp_dealloc = py_talloc_dealloc,
 358         .tp_basicsize = sizeof(py_talloc_Object),
 359         .tp_flags = Py_TPFLAGS_DEFAULT,
 360 };
 361
 362 static PyObject *py_default_path(PyObject *self)
 363 {
 364     return PyString_FromString(lp_default_path());
 365 }
 366
 367 static PyMethodDef pyparam_methods[] = {
 368     { "default_path", (PyCFunction)py_default_path, METH_NOARGS,
 369         "Returns the default smb.conf path." },
 370     { NULL }
 371 };
 372
 373 void initparam(void)
 374 {
 375         PyObject *m;
 376
 377         if (PyType_Ready(&PyLoadparmContext) < 0)
 378                 return;
 379
 380         m = Py_InitModule3("param", pyparam_methods, "Parsing and writing Samba configuration files.");
 381         if (m == NULL)
 382                 return;
 383
 384         Py_INCREF(&PyLoadparmContext);
 385         PyModule_AddObject(m, "LoadParm", (PyObject *)&PyLoadparmContext);
 386 }