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