source3/libsmb/pylibsmb.c

   1 /*
   2  * Unix SMB/CIFS implementation.
   3  * Samba-internal work in progress Python binding for libsmbclient
   4  *
   5  * Copyright (C) Volker Lendecke 2012
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published by
   9  * the Free Software Foundation; either version 3 of the License, or
  10  * (at your option) any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  19 */
  20
  21 #include <Python.h>
  22 #include "includes.h"
  23 #include "libsmb/libsmb.h"
  24 #include "libcli/security/security.h"
  25 #include "system/select.h"
  26 #include "source4/libcli/util/pyerrors.h"
  27 #include "auth/credentials/pycredentials.h"
  28 #include "trans2.h"
  29
  30 static PyTypeObject *get_pytype(const char *module, const char *type)
  31 {
  32         PyObject *mod;
  33         PyTypeObject *result;
  34
  35         mod = PyImport_ImportModule(module);
  36         if (mod == NULL) {
  37                 PyErr_Format(PyExc_RuntimeError,
  38                              "Unable to import %s to check type %s",
  39                              module, type);
  40                 return NULL;
  41         }
  42         result = (PyTypeObject *)PyObject_GetAttrString(mod, type);
  43         Py_DECREF(mod);
  44         if (result == NULL) {
  45                 PyErr_Format(PyExc_RuntimeError,
  46                              "Unable to find type %s in module %s",
  47                              module, type);
  48                 return NULL;
  49         }
  50         return result;
  51 }
  52
  53 /*
  54  * We're using "const char **" for keywords,
  55  * PyArg_ParseTupleAndKeywords expects a "char **". Confine the
  56  * inevitable warnings to just one place.
  57  */
  58 static int ParseTupleAndKeywords(PyObject *args, PyObject *kw,
  59                                  const char *format, const char **keywords,
  60                                  ...)
  61 {
  62         va_list a;
  63         int ret;
  64         va_start(a, keywords);
  65         ret = PyArg_VaParseTupleAndKeywords(args, kw, format,
  66                                             (char **)keywords, a);
  67         va_end(a);
  68         return ret;
  69 }
  70
  71 struct py_cli_thread;
  72
  73 struct py_cli_oplock_break {
  74         uint16_t fnum;
  75         uint8_t level;
  76 };
  77
  78 struct py_cli_state {
  79         PyObject_HEAD
  80         struct cli_state *cli;
  81         struct tevent_context *ev;
  82         struct py_cli_thread *thread_state;
  83
  84         struct tevent_req *oplock_waiter;
  85         struct py_cli_oplock_break *oplock_breaks;
  86         struct py_tevent_cond *oplock_cond;
  87 };
  88
  89 #if HAVE_PTHREAD
  90
  91 #include <pthread.h>
  92
  93 struct py_cli_thread {
  94
  95         /*
  96          * Pipe to make the poll thread wake up in our destructor, so
  97          * that we can exit and join the thread.
  98          */
  99         int shutdown_pipe[2];
 100         struct tevent_fd *shutdown_fde;
 101         bool do_shutdown;
 102         pthread_t id;
 103
 104         /*
 105          * Thread state to release the GIL during the poll(2) syscall
 106          */
 107         PyThreadState *py_threadstate;
 108 };
 109
 110 static void *py_cli_state_poll_thread(void *private_data)
 111 {
 112         struct py_cli_state *self = (struct py_cli_state *)private_data;
 113         struct py_cli_thread *t = self->thread_state;
 114         PyGILState_STATE gstate;
 115
 116         gstate = PyGILState_Ensure();
 117
 118         while (!t->do_shutdown) {
 119                 int ret;
 120                 ret = tevent_loop_once(self->ev);
 121                 assert(ret == 0);
 122         }
 123         PyGILState_Release(gstate);
 124         return NULL;
 125 }
 126
 127 static void py_cli_state_trace_callback(enum tevent_trace_point point,
 128                                         void *private_data)
 129 {
 130         struct py_cli_state *self = (struct py_cli_state *)private_data;
 131         struct py_cli_thread *t = self->thread_state;
 132
 133         switch(point) {
 134         case TEVENT_TRACE_BEFORE_WAIT:
 135                 assert(t->py_threadstate == NULL);
 136                 t->py_threadstate = PyEval_SaveThread();
 137                 break;
 138         case TEVENT_TRACE_AFTER_WAIT:
 139                 assert(t->py_threadstate != NULL);
 140                 PyEval_RestoreThread(t->py_threadstate);
 141                 t->py_threadstate = NULL;
 142                 break;
 143         default:
 144                 break;
 145         }
 146 }
 147
 148 static void py_cli_state_shutdown_handler(struct tevent_context *ev,
 149                                           struct tevent_fd *fde,
 150                                           uint16_t flags,
 151                                           void *private_data)
 152 {
 153         struct py_cli_state *self = (struct py_cli_state *)private_data;
 154         struct py_cli_thread *t = self->thread_state;
 155
 156         if ((flags & TEVENT_FD_READ) == 0) {
 157                 return;
 158         }
 159         TALLOC_FREE(t->shutdown_fde);
 160         t->do_shutdown = true;
 161 }
 162
 163 static int py_cli_thread_destructor(struct py_cli_thread *t)
 164 {
 165         char c = 0;
 166         ssize_t written;
 167         int ret;
 168
 169         do {
 170                 /*
 171                  * This will wake the poll thread from the poll(2)
 172                  */
 173                 written = write(t->shutdown_pipe[1], &c, 1);
 174         } while ((written == -1) && (errno == EINTR));
 175
 176         /*
 177          * Allow the poll thread to do its own cleanup under the GIL
 178          */
 179         Py_BEGIN_ALLOW_THREADS
 180         ret = pthread_join(t->id, NULL);
 181         Py_END_ALLOW_THREADS
 182         assert(ret == 0);
 183
 184         if (t->shutdown_pipe[0] != -1) {
 185                 close(t->shutdown_pipe[0]);
 186                 t->shutdown_pipe[0] = -1;
 187         }
 188         if (t->shutdown_pipe[1] != -1) {
 189                 close(t->shutdown_pipe[1]);
 190                 t->shutdown_pipe[1] = -1;
 191         }
 192         return 0;
 193 }
 194
 195 static bool py_cli_state_setup_ev(struct py_cli_state *self)
 196 {
 197         struct py_cli_thread *t = NULL;
 198         int ret;
 199
 200         self->ev = tevent_context_init_byname(NULL, "poll_mt");
 201         if (self->ev == NULL) {
 202                 goto fail;
 203         }
 204         tevent_set_trace_callback(self->ev, py_cli_state_trace_callback, self);
 205
 206         self->thread_state = talloc_zero(NULL, struct py_cli_thread);
 207         if (self->thread_state == NULL) {
 208                 goto fail;
 209         }
 210         t = self->thread_state;
 211
 212         ret = pipe(t->shutdown_pipe);
 213         if (ret == -1) {
 214                 goto fail;
 215         }
 216         t->shutdown_fde = tevent_add_fd(
 217                 self->ev, self->ev, t->shutdown_pipe[0], TEVENT_FD_READ,
 218                 py_cli_state_shutdown_handler, self);
 219         if (t->shutdown_fde == NULL) {
 220                 goto fail;
 221         }
 222
 223         PyEval_InitThreads();
 224
 225         ret = pthread_create(&t->id, NULL, py_cli_state_poll_thread, self);
 226         if (ret != 0) {
 227                 goto fail;
 228         }
 229         talloc_set_destructor(self->thread_state, py_cli_thread_destructor);
 230         return true;
 231
 232 fail:
 233         if (t != NULL) {
 234                 TALLOC_FREE(t->shutdown_fde);
 235
 236                 if (t->shutdown_pipe[0] != -1) {
 237                         close(t->shutdown_pipe[0]);
 238                         t->shutdown_pipe[0] = -1;
 239                 }
 240                 if (t->shutdown_pipe[1] != -1) {
 241                         close(t->shutdown_pipe[1]);
 242                         t->shutdown_pipe[1] = -1;
 243                 }
 244         }
 245
 246         TALLOC_FREE(self->thread_state);
 247         TALLOC_FREE(self->ev);
 248         return false;
 249 }
 250
 251 struct py_tevent_cond {
 252         pthread_mutex_t mutex;
 253         pthread_cond_t cond;
 254         bool is_done;
 255 };
 256
 257 static void py_tevent_signalme(struct tevent_req *req);
 258
 259 static int py_tevent_cond_wait(struct py_tevent_cond *cond)
 260 {
 261         int ret, result;
 262
 263         result = pthread_mutex_init(&cond->mutex, NULL);
 264         if (result != 0) {
 265                 goto fail;
 266         }
 267         result = pthread_cond_init(&cond->cond, NULL);
 268         if (result != 0) {
 269                 goto fail_mutex;
 270         }
 271
 272         result = pthread_mutex_lock(&cond->mutex);
 273         if (result != 0) {
 274                 goto fail_cond;
 275         }
 276
 277         cond->is_done = false;
 278
 279         while (!cond->is_done) {
 280
 281                 Py_BEGIN_ALLOW_THREADS
 282                 result = pthread_cond_wait(&cond->cond, &cond->mutex);
 283                 Py_END_ALLOW_THREADS
 284
 285                 if (result != 0) {
 286                         goto fail_unlock;
 287                 }
 288         }
 289
 290 fail_unlock:
 291         ret = pthread_mutex_unlock(&cond->mutex);
 292         assert(ret == 0);
 293 fail_cond:
 294         ret = pthread_cond_destroy(&cond->cond);
 295         assert(ret == 0);
 296 fail_mutex:
 297         ret = pthread_mutex_destroy(&cond->mutex);
 298         assert(ret == 0);
 299 fail:
 300         return result;
 301 }
 302
 303 static int py_tevent_req_wait(struct tevent_context *ev,
 304                               struct tevent_req *req)
 305 {
 306         struct py_tevent_cond cond;
 307         tevent_req_set_callback(req, py_tevent_signalme, &cond);
 308         return py_tevent_cond_wait(&cond);
 309 }
 310
 311 static void py_tevent_cond_signal(struct py_tevent_cond *cond)
 312 {
 313         int ret;
 314
 315         ret = pthread_mutex_lock(&cond->mutex);
 316         assert(ret == 0);
 317
 318         cond->is_done = true;
 319
 320         ret = pthread_cond_signal(&cond->cond);
 321         assert(ret == 0);
 322         ret = pthread_mutex_unlock(&cond->mutex);
 323         assert(ret == 0);
 324 }
 325
 326 static void py_tevent_signalme(struct tevent_req *req)
 327 {
 328         struct py_tevent_cond *cond = (struct py_tevent_cond *)
 329                 tevent_req_callback_data_void(req);
 330
 331         py_tevent_cond_signal(cond);
 332 }
 333
 334 #else
 335
 336 static bool py_cli_state_setup_ev(struct py_cli_state *self)
 337 {
 338         self->ev = tevent_context_init(NULL);
 339         return (self->ev != NULL);
 340 }
 341
 342 static int py_tevent_req_wait(struct tevent_context *ev,
 343                               struct tevent_req *req)
 344 {
 345         while (tevent_req_is_in_progress(req)) {
 346                 int ret;
 347
 348                 ret = tevent_loop_once(ev);
 349                 if (ret != 0) {
 350                         return ret;
 351                 }
 352         }
 353         return 0;
 354 }
 355
 356 #endif
 357
 358 static bool py_tevent_req_wait_exc(struct tevent_context *ev,
 359                                    struct tevent_req *req)
 360 {
 361         int ret;
 362
 363         if (req == NULL) {
 364                 PyErr_NoMemory();
 365                 return false;
 366         }
 367         ret = py_tevent_req_wait(ev, req);
 368         if (ret != 0) {
 369                 TALLOC_FREE(req);
 370                 errno = ret;
 371                 PyErr_SetFromErrno(PyExc_RuntimeError);
 372                 return false;
 373         }
 374         return true;
 375 }
 376
 377 static PyObject *py_cli_state_new(PyTypeObject *type, PyObject *args,
 378                                   PyObject *kwds)
 379 {
 380         struct py_cli_state *self;
 381
 382         self = (struct py_cli_state *)type->tp_alloc(type, 0);
 383         if (self == NULL) {
 384                 return NULL;
 385         }
 386         self->cli = NULL;
 387         self->ev = NULL;
 388         self->thread_state = NULL;
 389         self->oplock_waiter = NULL;
 390         self->oplock_cond = NULL;
 391         self->oplock_breaks = NULL;
 392         return (PyObject *)self;
 393 }
 394
 395 static void py_cli_got_oplock_break(struct tevent_req *req);
 396
 397 static int py_cli_state_init(struct py_cli_state *self, PyObject *args,
 398                              PyObject *kwds)
 399 {
 400         NTSTATUS status;
 401         char *host, *share;
 402         PyObject *creds;
 403         struct cli_credentials *cli_creds;
 404         bool ret;
 405
 406         static const char *kwlist[] = {
 407                 "host", "share", "credentials", NULL
 408         };
 409
 410         PyTypeObject *py_type_Credentials = get_pytype(
 411                 "samba.credentials", "Credentials");
 412         if (py_type_Credentials == NULL) {
 413                 return -1;
 414         }
 415
 416         ret = ParseTupleAndKeywords(
 417                 args, kwds, "ss|O!", kwlist,
 418                 &host, &share, py_type_Credentials, &creds);
 419
 420         Py_DECREF(py_type_Credentials);
 421
 422         if (!ret) {
 423                 return -1;
 424         }
 425
 426         if (!py_cli_state_setup_ev(self)) {
 427                 return -1;
 428         }
 429
 430         cli_creds = cli_credentials_from_py_object(creds);
 431         if (cli_creds == NULL) {
 432                 PyErr_SetString(PyExc_TypeError, "Expected credentials");
 433                 return -1;
 434         }
 435
 436         status = cli_full_connection(
 437                 &self->cli, "myname", host, NULL, 0, share, "?????",
 438                 cli_credentials_get_username(cli_creds),
 439                 cli_credentials_get_domain(cli_creds),
 440                 cli_credentials_get_password(cli_creds),
 441                 0, 0);
 442         if (!NT_STATUS_IS_OK(status)) {
 443                 PyErr_SetNTSTATUS(status);
 444                 return -1;
 445         }
 446
 447         self->oplock_waiter = cli_smb_oplock_break_waiter_send(
 448                 self->ev, self->ev, self->cli);
 449         if (self->oplock_waiter == NULL) {
 450                 PyErr_NoMemory();
 451                 return -1;
 452         }
 453         tevent_req_set_callback(self->oplock_waiter, py_cli_got_oplock_break,
 454                                 self);
 455         return 0;
 456 }
 457
 458 static void py_cli_got_oplock_break(struct tevent_req *req)
 459 {
 460         struct py_cli_state *self = (struct py_cli_state *)
 461                 tevent_req_callback_data_void(req);
 462         struct py_cli_oplock_break b;
 463         struct py_cli_oplock_break *tmp;
 464         size_t num_breaks;
 465         NTSTATUS status;
 466
 467         status = cli_smb_oplock_break_waiter_recv(req, &b.fnum, &b.level);
 468         TALLOC_FREE(req);
 469         self->oplock_waiter = NULL;
 470
 471         if (!NT_STATUS_IS_OK(status)) {
 472                 return;
 473         }
 474
 475         num_breaks = talloc_array_length(self->oplock_breaks);
 476         tmp = talloc_realloc(self->ev, self->oplock_breaks,
 477                              struct py_cli_oplock_break, num_breaks+1);
 478         if (tmp == NULL) {
 479                 return;
 480         }
 481         self->oplock_breaks = tmp;
 482         self->oplock_breaks[num_breaks] = b;
 483
 484         if (self->oplock_cond != NULL) {
 485                 py_tevent_cond_signal(self->oplock_cond);
 486         }
 487
 488         self->oplock_waiter = cli_smb_oplock_break_waiter_send(
 489                 self->ev, self->ev, self->cli);
 490         if (self->oplock_waiter == NULL) {
 491                 return;
 492         }
 493         tevent_req_set_callback(self->oplock_waiter, py_cli_got_oplock_break,
 494                                 self);
 495 }
 496
 497 static PyObject *py_cli_get_oplock_break(struct py_cli_state *self,
 498                                          PyObject *args)
 499 {
 500         size_t num_oplock_breaks;
 501
 502         if (!PyArg_ParseTuple(args, "")) {
 503                 return NULL;
 504         }
 505
 506         if (self->oplock_cond != NULL) {
 507                 errno = EBUSY;
 508                 PyErr_SetFromErrno(PyExc_RuntimeError);
 509                 return NULL;
 510         }
 511
 512         num_oplock_breaks = talloc_array_length(self->oplock_breaks);
 513
 514         if (num_oplock_breaks == 0) {
 515                 struct py_tevent_cond cond;
 516                 int ret;
 517
 518                 self->oplock_cond = &cond;
 519                 ret = py_tevent_cond_wait(&cond);
 520                 self->oplock_cond = NULL;
 521
 522                 if (ret != 0) {
 523                         errno = ret;
 524                         PyErr_SetFromErrno(PyExc_RuntimeError);
 525                         return NULL;
 526                 }
 527         }
 528
 529         num_oplock_breaks = talloc_array_length(self->oplock_breaks);
 530         if (num_oplock_breaks > 0) {
 531                 PyObject *result;
 532
 533                 result = Py_BuildValue(
 534                         "{s:i,s:i}",
 535                         "fnum", self->oplock_breaks[0].fnum,
 536                         "level", self->oplock_breaks[0].level);
 537
 538                 memmove(&self->oplock_breaks[0], &self->oplock_breaks[1],
 539                         sizeof(self->oplock_breaks[0]) *
 540                         (num_oplock_breaks - 1));
 541                 self->oplock_breaks = talloc_realloc(
 542                         NULL, self->oplock_breaks, struct py_cli_oplock_break,
 543                         num_oplock_breaks - 1);
 544
 545                 return result;
 546         }
 547
 548         Py_INCREF(Py_None);
 549         return Py_None;
 550 }
 551
 552 static void py_cli_state_dealloc(struct py_cli_state *self)
 553 {
 554         TALLOC_FREE(self->thread_state);
 555         TALLOC_FREE(self->oplock_waiter);
 556         TALLOC_FREE(self->ev);
 557
 558         if (self->cli != NULL) {
 559                 cli_shutdown(self->cli);
 560                 self->cli = NULL;
 561         }
 562         self->ob_type->tp_free((PyObject *)self);
 563 }
 564
 565 static PyObject *py_cli_create(struct py_cli_state *self, PyObject *args,
 566                                PyObject *kwds)
 567 {
 568         char *fname;
 569         unsigned CreateFlags = 0;
 570         unsigned DesiredAccess = FILE_GENERIC_READ;
 571         unsigned FileAttributes = 0;
 572         unsigned ShareAccess = 0;
 573         unsigned CreateDisposition = FILE_OPEN;
 574         unsigned CreateOptions = 0;
 575         unsigned SecurityFlags = 0;
 576         uint16_t fnum;
 577         struct tevent_req *req;
 578         NTSTATUS status;
 579
 580         static const char *kwlist[] = {
 581                 "Name", "CreateFlags", "DesiredAccess", "FileAttributes",
 582                 "ShareAccess", "CreateDisposition", "CreateOptions",
 583                 "SecurityFlags", NULL };
 584
 585         if (!ParseTupleAndKeywords(
 586                     args, kwds, "s|IIIIIII", kwlist,
 587                     &fname, &CreateFlags, &DesiredAccess, &FileAttributes,
 588                     &ShareAccess, &CreateDisposition, &CreateOptions,
 589                     &SecurityFlags)) {
 590                 return NULL;
 591         }
 592
 593         req = cli_ntcreate_send(NULL, self->ev, self->cli, fname, CreateFlags,
 594                                 DesiredAccess, FileAttributes, ShareAccess,
 595                                 CreateDisposition, CreateOptions,
 596                                 SecurityFlags);
 597         if (!py_tevent_req_wait_exc(self->ev, req)) {
 598                 return NULL;
 599         }
 600         status = cli_ntcreate_recv(req, &fnum);
 601         TALLOC_FREE(req);
 602
 603         if (!NT_STATUS_IS_OK(status)) {
 604                 PyErr_SetNTSTATUS(status);
 605                 return NULL;
 606         }
 607         return Py_BuildValue("I", (unsigned)fnum);
 608 }
 609
 610 static PyObject *py_cli_close(struct py_cli_state *self, PyObject *args)
 611 {
 612         struct tevent_req *req;
 613         int fnum;
 614         NTSTATUS status;
 615
 616         if (!PyArg_ParseTuple(args, "i", &fnum)) {
 617                 return NULL;
 618         }
 619
 620         req = cli_close_send(NULL, self->ev, self->cli, fnum);
 621         if (!py_tevent_req_wait_exc(self->ev, req)) {
 622                 return NULL;
 623         }
 624         status = cli_close_recv(req);
 625         TALLOC_FREE(req);
 626
 627         if (!NT_STATUS_IS_OK(status)) {
 628                 PyErr_SetNTSTATUS(status);
 629                 return NULL;
 630         }
 631         Py_INCREF(Py_None);
 632         return Py_None;
 633 }
 634
 635 static PyObject *py_cli_write(struct py_cli_state *self, PyObject *args,
 636                               PyObject *kwds)
 637 {
 638         int fnum;
 639         unsigned mode = 0;
 640         char *buf;
 641         int buflen;
 642         unsigned long long offset;
 643         struct tevent_req *req;
 644         NTSTATUS status;
 645         size_t written;
 646
 647         static const char *kwlist[] = {
 648                 "fnum", "buffer", "offset", "mode", NULL };
 649
 650         if (!ParseTupleAndKeywords(
 651                     args, kwds, "Is#K|I", kwlist,
 652                     &fnum, &buf, &buflen, &offset, &mode)) {
 653                 return NULL;
 654         }
 655
 656         req = cli_write_andx_send(NULL, self->ev, self->cli, fnum, mode,
 657                                   (uint8_t *)buf, offset, buflen);
 658         if (!py_tevent_req_wait_exc(self->ev, req)) {
 659                 return NULL;
 660         }
 661         status = cli_write_andx_recv(req, &written);
 662         TALLOC_FREE(req);
 663
 664         if (!NT_STATUS_IS_OK(status)) {
 665                 PyErr_SetNTSTATUS(status);
 666                 return NULL;
 667         }
 668         return Py_BuildValue("K", (unsigned long long)written);
 669 }
 670
 671 static PyObject *py_cli_read(struct py_cli_state *self, PyObject *args,
 672                              PyObject *kwds)
 673 {
 674         int fnum;
 675         unsigned long long offset;
 676         unsigned size;
 677         struct tevent_req *req;
 678         NTSTATUS status;
 679         uint8_t *buf;
 680         ssize_t buflen;
 681         PyObject *result;
 682
 683         static const char *kwlist[] = {
 684                 "fnum", "offset", "size", NULL };
 685
 686         if (!ParseTupleAndKeywords(
 687                     args, kwds, "IKI", kwlist, &fnum, &offset,
 688                     &size)) {
 689                 return NULL;
 690         }
 691
 692         req = cli_read_andx_send(NULL, self->ev, self->cli, fnum,
 693                                  offset, size);
 694         if (!py_tevent_req_wait_exc(self->ev, req)) {
 695                 return NULL;
 696         }
 697         status = cli_read_andx_recv(req, &buflen, &buf);
 698
 699         if (!NT_STATUS_IS_OK(status)) {
 700                 TALLOC_FREE(req);
 701                 PyErr_SetNTSTATUS(status);
 702                 return NULL;
 703         }
 704         result = Py_BuildValue("s#", (char *)buf, (int)buflen);
 705         TALLOC_FREE(req);
 706         return result;
 707 }
 708
 709 static PyObject *py_cli_ftruncate(struct py_cli_state *self, PyObject *args,
 710                                   PyObject *kwds)
 711 {
 712         int fnum;
 713         unsigned long long size;
 714         struct tevent_req *req;
 715         NTSTATUS status;
 716
 717         static const char *kwlist[] = {
 718                 "fnum", "size", NULL };
 719
 720         if (!ParseTupleAndKeywords(
 721                     args, kwds, "IK", kwlist, &fnum, &size)) {
 722                 return NULL;
 723         }
 724
 725         req = cli_ftruncate_send(NULL, self->ev, self->cli, fnum, size);
 726         if (!py_tevent_req_wait_exc(self->ev, req)) {
 727                 return NULL;
 728         }
 729         status = cli_ftruncate_recv(req);
 730         TALLOC_FREE(req);
 731
 732         if (!NT_STATUS_IS_OK(status)) {
 733                 PyErr_SetNTSTATUS(status);
 734                 return NULL;
 735         }
 736         Py_INCREF(Py_None);
 737         return Py_None;
 738 }
 739
 740 static PyObject *py_cli_delete_on_close(struct py_cli_state *self,
 741                                         PyObject *args,
 742                                         PyObject *kwds)
 743 {
 744         unsigned fnum, flag;
 745         struct tevent_req *req;
 746         NTSTATUS status;
 747
 748         static const char *kwlist[] = {
 749                 "fnum", "flag", NULL };
 750
 751         if (!ParseTupleAndKeywords(
 752                     args, kwds, "II", kwlist, &fnum, &flag)) {
 753                 return NULL;
 754         }
 755
 756         req = cli_nt_delete_on_close_send(NULL, self->ev, self->cli, fnum,
 757                                           flag);
 758         if (!py_tevent_req_wait_exc(self->ev, req)) {
 759                 return NULL;
 760         }
 761         status = cli_nt_delete_on_close_recv(req);
 762         TALLOC_FREE(req);
 763
 764         if (!NT_STATUS_IS_OK(status)) {
 765                 PyErr_SetNTSTATUS(status);
 766                 return NULL;
 767         }
 768         Py_INCREF(Py_None);
 769         return Py_None;
 770 }
 771
 772 static PyObject *py_cli_list(struct py_cli_state *self,
 773                              PyObject *args,
 774                              PyObject *kwds)
 775 {
 776         char *mask;
 777         unsigned attribute =
 778                 FILE_ATTRIBUTE_DIRECTORY |
 779                 FILE_ATTRIBUTE_SYSTEM |
 780                 FILE_ATTRIBUTE_HIDDEN;
 781         unsigned info_level = SMB_FIND_FILE_BOTH_DIRECTORY_INFO;
 782         struct tevent_req *req;
 783         NTSTATUS status;
 784         struct file_info *finfos;
 785         size_t i, num_finfos;
 786         PyObject *result;
 787
 788         const char *kwlist[] = {
 789                 "mask", "attribute", "info_level", NULL
 790         };
 791
 792         if (!ParseTupleAndKeywords(
 793                     args, kwds, "s|II", kwlist,
 794                     &mask, &attribute, &info_level)) {
 795                 return NULL;
 796         }
 797
 798         req = cli_list_send(NULL, self->ev, self->cli, mask, attribute,
 799                             info_level);
 800         if (!py_tevent_req_wait_exc(self->ev, req)) {
 801                 return NULL;
 802         }
 803         status = cli_list_recv(req, NULL, &finfos, &num_finfos);
 804         TALLOC_FREE(req);
 805
 806         if (!NT_STATUS_IS_OK(status)) {
 807                 PyErr_SetNTSTATUS(status);
 808                 return NULL;
 809         }
 810
 811         result = Py_BuildValue("[]");
 812         if (result == NULL) {
 813                 return NULL;
 814         }
 815
 816         for (i=0; i<num_finfos; i++) {
 817                 struct file_info *finfo = &finfos[i];
 818                 PyObject *file;
 819                 int ret;
 820
 821                 file = Py_BuildValue(
 822                         "{s:s,s:i}",
 823                         "name", finfo->name,
 824                         "mode", (int)finfo->mode);
 825                 if (file == NULL) {
 826                         Py_XDECREF(result);
 827                         return NULL;
 828                 }
 829
 830                 ret = PyList_Append(result, file);
 831                 if (ret == -1) {
 832                         Py_XDECREF(result);
 833                         return NULL;
 834                 }
 835         }
 836
 837         return result;
 838 }
 839
 840 static PyMethodDef py_cli_state_methods[] = {
 841         { "create", (PyCFunction)py_cli_create, METH_VARARGS|METH_KEYWORDS,
 842           "Open a file" },
 843         { "close", (PyCFunction)py_cli_close, METH_VARARGS,
 844           "Close a file handle" },
 845         { "write", (PyCFunction)py_cli_write, METH_VARARGS|METH_KEYWORDS,
 846           "Write to a file handle" },
 847         { "read", (PyCFunction)py_cli_read, METH_VARARGS|METH_KEYWORDS,
 848           "Read from a file handle" },
 849         { "truncate", (PyCFunction)py_cli_ftruncate,
 850           METH_VARARGS|METH_KEYWORDS,
 851           "Truncate a file" },
 852         { "delete_on_close", (PyCFunction)py_cli_delete_on_close,
 853           METH_VARARGS|METH_KEYWORDS,
 854           "Set/Reset the delete on close flag" },
 855         { "readdir", (PyCFunction)py_cli_list,
 856           METH_VARARGS|METH_KEYWORDS,
 857           "List a directory" },
 858         { "get_oplock_break", (PyCFunction)py_cli_get_oplock_break,
 859           METH_VARARGS, "Wait for an oplock break" },
 860         { NULL, NULL, 0, NULL }
 861 };
 862
 863 static PyTypeObject py_cli_state_type = {
 864         PyObject_HEAD_INIT(NULL)
 865         .tp_name = "libsmb_samba_internal.Conn",
 866         .tp_basicsize = sizeof(struct py_cli_state),
 867         .tp_flags = Py_TPFLAGS_DEFAULT | Py_TPFLAGS_BASETYPE,
 868         .tp_doc = "libsmb connection",
 869         .tp_new = py_cli_state_new,
 870         .tp_init = (initproc)py_cli_state_init,
 871         .tp_dealloc = (destructor)py_cli_state_dealloc,
 872         .tp_methods = py_cli_state_methods,
 873 };
 874
 875 static PyMethodDef py_libsmb_methods[] = {
 876         { NULL },
 877 };
 878
 879 void initlibsmb_samba_internal(void);
 880 void initlibsmb_samba_internal(void)
 881 {
 882         PyObject *m;
 883
 884         talloc_stackframe();
 885
 886         m = Py_InitModule3("libsmb_samba_internal", py_libsmb_methods,
 887                            "libsmb wrapper");
 888
 889         if (PyType_Ready(&py_cli_state_type) < 0) {
 890                 return;
 891         }
 892         Py_INCREF(&py_cli_state_type);
 893         PyModule_AddObject(m, "Conn", (PyObject *)&py_cli_state_type);
 894 }