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