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Fix const warnings.
[Samba/gebeck_regimport.git] / source3 / smbd / smb2_read.c
blob13bcbdfd19b8b03d15b6d6af09498889d1c72db6
1 /*
2 Unix SMB/CIFS implementation.
3 Core SMB2 server
4
5 Copyright (C) Stefan Metzmacher 2009
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 "includes.h"
22 #include "system/filesys.h"
23 #include "smbd/smbd.h"
24 #include "smbd/globals.h"
25 #include "../libcli/smb/smb_common.h"
26 #include "libcli/security/security.h"
27 #include "../lib/util/tevent_ntstatus.h"
28 #include "rpc_server/srv_pipe_hnd.h"
29
30 static struct tevent_req *smbd_smb2_read_send(TALLOC_CTX *mem_ctx,
31 struct tevent_context *ev,
32 struct smbd_smb2_request *smb2req,
33 uint32_t in_smbpid,
34 uint64_t in_file_id_volatile,
35 uint32_t in_length,
36 uint64_t in_offset,
37 uint32_t in_minimum,
38 uint32_t in_remaining);
39 static NTSTATUS smbd_smb2_read_recv(struct tevent_req *req,
40 TALLOC_CTX *mem_ctx,
41 DATA_BLOB *out_data,
42 uint32_t *out_remaining);
43
44 static void smbd_smb2_request_read_done(struct tevent_req *subreq);
45 NTSTATUS smbd_smb2_request_process_read(struct smbd_smb2_request *req)
46 {
47 NTSTATUS status;
48 const uint8_t *inhdr;
49 const uint8_t *inbody;
50 int i = req->current_idx;
51 uint32_t in_smbpid;
52 uint32_t in_length;
53 uint64_t in_offset;
54 uint64_t in_file_id_persistent;
55 uint64_t in_file_id_volatile;
56 uint32_t in_minimum_count;
57 uint32_t in_remaining_bytes;
58 struct tevent_req *subreq;
59
60 status = smbd_smb2_request_verify_sizes(req, 0x31);
61 if (!NT_STATUS_IS_OK(status)) {
62 return smbd_smb2_request_error(req, status);
63 }
64 inhdr = (const uint8_t *)req->in.vector[i+0].iov_base;
65 inbody = (const uint8_t *)req->in.vector[i+1].iov_base;
66
67 in_smbpid = IVAL(inhdr, SMB2_HDR_PID);
68
69 in_length = IVAL(inbody, 0x04);
70 in_offset = BVAL(inbody, 0x08);
71 in_file_id_persistent = BVAL(inbody, 0x10);
72 in_file_id_volatile = BVAL(inbody, 0x18);
73 in_minimum_count = IVAL(inbody, 0x20);
74 in_remaining_bytes = IVAL(inbody, 0x28);
75
76 /* check the max read size */
77 if (in_length > req->sconn->smb2.max_read) {
78 DEBUG(0,("here:%s: 0x%08X: 0x%08X\n",
79 __location__, in_length, req->sconn->smb2.max_read));
80 return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
81 }
82
83 if (req->compat_chain_fsp) {
84 /* skip check */
85 } else if (in_file_id_persistent != in_file_id_volatile) {
86 return smbd_smb2_request_error(req, NT_STATUS_FILE_CLOSED);
87 }
88
89 subreq = smbd_smb2_read_send(req,
90 req->sconn->ev_ctx,
91 req,
92 in_smbpid,
93 in_file_id_volatile,
94 in_length,
95 in_offset,
96 in_minimum_count,
97 in_remaining_bytes);
98 if (subreq == NULL) {
99 return smbd_smb2_request_error(req, NT_STATUS_NO_MEMORY);
100 }
101 tevent_req_set_callback(subreq, smbd_smb2_request_read_done, req);
102
103 return smbd_smb2_request_pending_queue(req, subreq, 500);
104 }
105
106 static void smbd_smb2_request_read_done(struct tevent_req *subreq)
107 {
108 struct smbd_smb2_request *req = tevent_req_callback_data(subreq,
109 struct smbd_smb2_request);
110 DATA_BLOB outbody;
111 DATA_BLOB outdyn;
112 uint8_t out_data_offset;
113 DATA_BLOB out_data_buffer = data_blob_null;
114 uint32_t out_data_remaining = 0;
115 NTSTATUS status;
116 NTSTATUS error; /* transport error */
117
118 status = smbd_smb2_read_recv(subreq,
119 req,
120 &out_data_buffer,
121 &out_data_remaining);
122 TALLOC_FREE(subreq);
123 if (!NT_STATUS_IS_OK(status)) {
124 error = smbd_smb2_request_error(req, status);
125 if (!NT_STATUS_IS_OK(error)) {
126 smbd_server_connection_terminate(req->sconn,
127 nt_errstr(error));
128 return;
129 }
130 return;
131 }
132
133 out_data_offset = SMB2_HDR_BODY + 0x10;
134
135 outbody = data_blob_talloc(req->out.vector, NULL, 0x10);
136 if (outbody.data == NULL) {
137 error = smbd_smb2_request_error(req, NT_STATUS_NO_MEMORY);
138 if (!NT_STATUS_IS_OK(error)) {
139 smbd_server_connection_terminate(req->sconn,
140 nt_errstr(error));
141 return;
142 }
143 return;
144 }
145
146 SSVAL(outbody.data, 0x00, 0x10 + 1); /* struct size */
147 SCVAL(outbody.data, 0x02,
148 out_data_offset); /* data offset */
149 SCVAL(outbody.data, 0x03, 0); /* reserved */
150 SIVAL(outbody.data, 0x04,
151 out_data_buffer.length); /* data length */
152 SIVAL(outbody.data, 0x08,
153 out_data_remaining); /* data remaining */
154 SIVAL(outbody.data, 0x0C, 0); /* reserved */
155
156 outdyn = out_data_buffer;
157
158 error = smbd_smb2_request_done(req, outbody, &outdyn);
159 if (!NT_STATUS_IS_OK(error)) {
160 smbd_server_connection_terminate(req->sconn,
161 nt_errstr(error));
162 return;
163 }
164 }
165
166 struct smbd_smb2_read_state {
167 struct smbd_smb2_request *smb2req;
168 struct smb_request *smbreq;
169 files_struct *fsp;
170 uint64_t in_file_id_volatile;
171 uint32_t in_length;
172 uint64_t in_offset;
173 uint32_t in_minimum;
174 DATA_BLOB out_data;
175 uint32_t out_remaining;
176 };
177
178 /* struct smbd_smb2_read_state destructor. Send the SMB2_READ data. */
179 static int smb2_sendfile_send_data(struct smbd_smb2_read_state *state)
180 {
181 struct lock_struct lock;
182 uint32_t in_length = state->in_length;
183 uint64_t in_offset = state->in_offset;
184 files_struct *fsp = state->fsp;
185 ssize_t nread;
186
187 nread = SMB_VFS_SENDFILE(fsp->conn->sconn->sock,
188 fsp,
189 NULL,
190 in_offset,
191 in_length);
192 DEBUG(10,("smb2_sendfile_send_data: SMB_VFS_SENDFILE returned %d on file %s\n",
193 (int)nread,
194 fsp_str_dbg(fsp) ));
195
196 if (nread == -1) {
197 if (errno == ENOSYS || errno == EINTR) {
198 /*
199 * Special hack for broken systems with no working
200 * sendfile. Fake this up by doing read/write calls.
201 */
202 set_use_sendfile(SNUM(fsp->conn), false);
203 nread = fake_sendfile(fsp, in_offset, in_length);
204 if (nread == -1) {
205 DEBUG(0,("smb2_sendfile_send_data: "
206 "fake_sendfile failed for "
207 "file %s (%s).\n",
208 fsp_str_dbg(fsp),
209 strerror(errno)));
210 exit_server_cleanly("smb2_sendfile_send_data: "
211 "fake_sendfile failed");
212 }
213 goto out;
214 }
215
216 DEBUG(0,("smb2_sendfile_send_data: sendfile failed for file "
217 "%s (%s). Terminating\n",
218 fsp_str_dbg(fsp),
219 strerror(errno)));
220 exit_server_cleanly("smb2_sendfile_send_data: sendfile failed");
221 } else if (nread == 0) {
222 /*
223 * Some sendfile implementations return 0 to indicate
224 * that there was a short read, but nothing was
225 * actually written to the socket. In this case,
226 * fallback to the normal read path so the header gets
227 * the correct byte count.
228 */
229 DEBUG(3, ("send_file_readX: sendfile sent zero bytes "
230 "falling back to the normal read: %s\n",
231 fsp_str_dbg(fsp)));
232
233 nread = fake_sendfile(fsp, in_offset, in_length);
234 if (nread == -1) {
235 DEBUG(0,("smb2_sendfile_send_data: "
236 "fake_sendfile failed for file "
237 "%s (%s). Terminating\n",
238 fsp_str_dbg(fsp),
239 strerror(errno)));
240 exit_server_cleanly("smb2_sendfile_send_data: "
241 "fake_sendfile failed");
242 }
243 }
244
245 out:
246
247 if (nread < in_length) {
248 sendfile_short_send(fsp, nread, 0, in_length);
249 }
250
251 init_strict_lock_struct(fsp,
252 state->in_file_id_volatile,
253 in_offset,
254 in_length,
255 READ_LOCK,
256 &lock);
257
258 SMB_VFS_STRICT_UNLOCK(fsp->conn, fsp, &lock);
259 return 0;
260 }
261
262 static NTSTATUS schedule_smb2_sendfile_read(struct smbd_smb2_request *smb2req,
263 struct smbd_smb2_read_state *state)
264 {
265 struct smbd_smb2_read_state *state_copy = NULL;
266 files_struct *fsp = state->fsp;
267
268 /*
269 * We cannot use sendfile if...
270 * We were not configured to do so OR
271 * Signing is active OR
272 * This is a compound SMB2 operation OR
273 * fsp is a STREAM file OR
274 * We're using a write cache OR
275 * It's not a regular file OR
276 * Requested offset is greater than file size OR
277 * there's not enough data in the file.
278 * Phew :-). Luckily this means most
279 * reads on most normal files. JRA.
280 */
281
282 if (!lp__use_sendfile(SNUM(fsp->conn)) ||
283 smb2req->do_signing ||
284 smb2req->in.vector_count != 4 ||
285 (fsp->base_fsp != NULL) ||
286 (fsp->wcp != NULL) ||
287 (!S_ISREG(fsp->fsp_name->st.st_ex_mode)) ||
288 (state->in_offset >= fsp->fsp_name->st.st_ex_size) ||
289 (fsp->fsp_name->st.st_ex_size < state->in_offset +
290 state->in_length)) {
291 return NT_STATUS_RETRY;
292 }
293
294 /* We've already checked there's this amount of data
295 to read. */
296 state->out_data.length = state->in_length;
297 state->out_remaining = 0;
298
299 /* Make a copy of state attached to the smb2req. Attach
300 the destructor here as this will trigger the sendfile
301 call when the request is destroyed. */
302 state_copy = talloc(smb2req, struct smbd_smb2_read_state);
303 if (!state_copy) {
304 return NT_STATUS_NO_MEMORY;
305 }
306 *state_copy = *state;
307 talloc_set_destructor(state_copy, smb2_sendfile_send_data);
308 return NT_STATUS_OK;
309 }
310
311 static void smbd_smb2_read_pipe_done(struct tevent_req *subreq);
312
313 /*******************************************************************
314 Common read complete processing function for both synchronous and
315 asynchronous reads.
316 *******************************************************************/
317
318 NTSTATUS smb2_read_complete(struct tevent_req *req, ssize_t nread, int err)
319 {
320 struct smbd_smb2_read_state *state = tevent_req_data(req,
321 struct smbd_smb2_read_state);
322 files_struct *fsp = state->fsp;
323
324 if (nread < 0) {
325 NTSTATUS status = map_nt_error_from_unix(err);
326
327 DEBUG( 3,( "smb2_read_complete: file %s nread = %d. "
328 "Error = %s (NTSTATUS %s)\n",
329 fsp_str_dbg(fsp),
330 (int)nread,
331 strerror(err),
332 nt_errstr(status)));
333
334 return status;
335 }
336 if (nread == 0 && state->in_length != 0) {
337 DEBUG(5,("smb2_read_complete: read_file[%s] end of file\n",
338 fsp_str_dbg(fsp)));
339 return NT_STATUS_END_OF_FILE;
340 }
341
342 if (nread < state->in_minimum) {
343 DEBUG(5,("smb2_read_complete: read_file[%s] read less %d than "
344 "minimum requested %u. Returning end of file\n",
345 fsp_str_dbg(fsp),
346 (int)nread,
347 (unsigned int)state->in_minimum));
348 return NT_STATUS_END_OF_FILE;
349 }
350
351 DEBUG(3,("smbd_smb2_read: fnum=[%d/%s] length=%lu offset=%lu read=%lu\n",
352 fsp->fnum,
353 fsp_str_dbg(fsp),
354 (unsigned long)state->in_length,
355 (unsigned long)state->in_offset,
356 (unsigned long)nread));
357
358 state->out_data.length = nread;
359 state->out_remaining = 0;
360
361 return NT_STATUS_OK;
362 }
363
364 static bool smbd_smb2_read_cancel(struct tevent_req *req)
365 {
366 struct smbd_smb2_read_state *state =
367 tevent_req_data(req,
368 struct smbd_smb2_read_state);
369
370 state->smb2req->cancelled = true;
371
372 return cancel_smb2_aio(state->smbreq);
373 }
374
375 static struct tevent_req *smbd_smb2_read_send(TALLOC_CTX *mem_ctx,
376 struct tevent_context *ev,
377 struct smbd_smb2_request *smb2req,
378 uint32_t in_smbpid,
379 uint64_t in_file_id_volatile,
380 uint32_t in_length,
381 uint64_t in_offset,
382 uint32_t in_minimum,
383 uint32_t in_remaining)
384 {
385 NTSTATUS status;
386 struct tevent_req *req = NULL;
387 struct smbd_smb2_read_state *state = NULL;
388 struct smb_request *smbreq = NULL;
389 connection_struct *conn = smb2req->tcon->compat_conn;
390 files_struct *fsp = NULL;
391 ssize_t nread = -1;
392 struct lock_struct lock;
393 int saved_errno;
394
395 req = tevent_req_create(mem_ctx, &state,
396 struct smbd_smb2_read_state);
397 if (req == NULL) {
398 return NULL;
399 }
400 state->smb2req = smb2req;
401 state->in_length = in_length;
402 state->in_offset = in_offset;
403 state->in_minimum = in_minimum;
404 state->out_data = data_blob_null;
405 state->out_remaining = 0;
406
407 DEBUG(10,("smbd_smb2_read: file_id[0x%016llX]\n",
408 (unsigned long long)in_file_id_volatile));
409
410 smbreq = smbd_smb2_fake_smb_request(smb2req);
411 if (tevent_req_nomem(smbreq, req)) {
412 return tevent_req_post(req, ev);
413 }
414 state->smbreq = smbreq;
415
416 fsp = file_fsp(smbreq, (uint16_t)in_file_id_volatile);
417 if (fsp == NULL) {
418 tevent_req_nterror(req, NT_STATUS_FILE_CLOSED);
419 return tevent_req_post(req, ev);
420 }
421 if (conn != fsp->conn) {
422 tevent_req_nterror(req, NT_STATUS_FILE_CLOSED);
423 return tevent_req_post(req, ev);
424 }
425 if (smb2req->session->vuid != fsp->vuid) {
426 tevent_req_nterror(req, NT_STATUS_FILE_CLOSED);
427 return tevent_req_post(req, ev);
428 }
429 if (fsp->is_directory) {
430 tevent_req_nterror(req, NT_STATUS_INVALID_DEVICE_REQUEST);
431 return tevent_req_post(req, ev);
432 }
433
434 state->fsp = fsp;
435 state->in_file_id_volatile = in_file_id_volatile;
436
437 if (IS_IPC(smbreq->conn)) {
438 struct tevent_req *subreq = NULL;
439
440 state->out_data = data_blob_talloc(state, NULL, in_length);
441 if (in_length > 0 && tevent_req_nomem(state->out_data.data, req)) {
442 return tevent_req_post(req, ev);
443 }
444
445 if (!fsp_is_np(fsp)) {
446 tevent_req_nterror(req, NT_STATUS_FILE_CLOSED);
447 return tevent_req_post(req, ev);
448 }
449
450 subreq = np_read_send(state, ev,
451 fsp->fake_file_handle,
452 state->out_data.data,
453 state->out_data.length);
454 if (tevent_req_nomem(subreq, req)) {
455 return tevent_req_post(req, ev);
456 }
457 tevent_req_set_callback(subreq,
458 smbd_smb2_read_pipe_done,
459 req);
460 return req;
461 }
462
463 if (!CHECK_READ(fsp, smbreq)) {
464 tevent_req_nterror(req, NT_STATUS_ACCESS_DENIED);
465 return tevent_req_post(req, ev);
466 }
467
468 status = schedule_smb2_aio_read(fsp->conn,
469 smbreq,
470 fsp,
471 state,
472 &state->out_data,
473 (SMB_OFF_T)in_offset,
474 (size_t)in_length);
475
476 if (NT_STATUS_IS_OK(status)) {
477 /*
478 * Doing an async read, allow this
479 * request to be canceled
480 */
481 tevent_req_set_cancel_fn(req, smbd_smb2_read_cancel);
482 return req;
483 }
484
485 if (!NT_STATUS_EQUAL(status, NT_STATUS_RETRY)) {
486 /* Real error in setting up aio. Fail. */
487 tevent_req_nterror(req, NT_STATUS_FILE_CLOSED);
488 return tevent_req_post(req, ev);
489 }
490
491 /* Fallback to synchronous. */
492
493 init_strict_lock_struct(fsp,
494 in_file_id_volatile,
495 in_offset,
496 in_length,
497 READ_LOCK,
498 &lock);
499
500 if (!SMB_VFS_STRICT_LOCK(conn, fsp, &lock)) {
501 tevent_req_nterror(req, NT_STATUS_FILE_LOCK_CONFLICT);
502 return tevent_req_post(req, ev);
503 }
504
505 /* Try sendfile in preference. */
506 status = schedule_smb2_sendfile_read(smb2req, state);
507 if (NT_STATUS_IS_OK(status)) {
508 tevent_req_done(req);
509 return tevent_req_post(req, ev);
510 } else {
511 if (!NT_STATUS_EQUAL(status, NT_STATUS_RETRY)) {
512 SMB_VFS_STRICT_UNLOCK(conn, fsp, &lock);
513 tevent_req_nterror(req, status);
514 return tevent_req_post(req, ev);
515 }
516 }
517
518 /* Ok, read into memory. Allocate the out buffer. */
519 state->out_data = data_blob_talloc(state, NULL, in_length);
520 if (in_length > 0 && tevent_req_nomem(state->out_data.data, req)) {
521 SMB_VFS_STRICT_UNLOCK(conn, fsp, &lock);
522 return tevent_req_post(req, ev);
523 }
524
525 nread = read_file(fsp,
526 (char *)state->out_data.data,
527 in_offset,
528 in_length);
529
530 saved_errno = errno;
531
532 SMB_VFS_STRICT_UNLOCK(conn, fsp, &lock);
533
534 DEBUG(10,("smbd_smb2_read: file %s handle [0x%016llX] offset=%llu "
535 "len=%llu returned %lld\n",
536 fsp_str_dbg(fsp),
537 (unsigned long long)in_file_id_volatile,
538 (unsigned long long)in_offset,
539 (unsigned long long)in_length,
540 (long long)nread));
541
542 status = smb2_read_complete(req, nread, saved_errno);
543 if (!NT_STATUS_IS_OK(status)) {
544 tevent_req_nterror(req, status);
545 } else {
546 /* Success. */
547 tevent_req_done(req);
548 }
549 return tevent_req_post(req, ev);
550 }
551
552 static void smbd_smb2_read_pipe_done(struct tevent_req *subreq)
553 {
554 struct tevent_req *req = tevent_req_callback_data(subreq,
555 struct tevent_req);
556 struct smbd_smb2_read_state *state = tevent_req_data(req,
557 struct smbd_smb2_read_state);
558 NTSTATUS status;
559 ssize_t nread = -1;
560 bool is_data_outstanding;
561
562 status = np_read_recv(subreq, &nread, &is_data_outstanding);
563 TALLOC_FREE(subreq);
564 if (!NT_STATUS_IS_OK(status)) {
565 tevent_req_nterror(req, status);
566 return;
567 }
568
569 if (nread == 0 && state->out_data.length != 0) {
570 tevent_req_nterror(req, NT_STATUS_END_OF_FILE);
571 return;
572 }
573
574 state->out_data.length = nread;
575 state->out_remaining = 0;
576
577 /*
578 * TODO: add STATUS_BUFFER_OVERFLOW handling, once we also
579 * handle it in SMB1 pipe_read_andx_done().
580 */
581
582 tevent_req_done(req);
583 }
584
585 static NTSTATUS smbd_smb2_read_recv(struct tevent_req *req,
586 TALLOC_CTX *mem_ctx,
587 DATA_BLOB *out_data,
588 uint32_t *out_remaining)
589 {
590 NTSTATUS status;
591 struct smbd_smb2_read_state *state = tevent_req_data(req,
592 struct smbd_smb2_read_state);
593
594 if (tevent_req_is_nterror(req, &status)) {
595 tevent_req_received(req);
596 return status;
597 }
598
599 *out_data = state->out_data;
600 talloc_steal(mem_ctx, out_data->data);
601 *out_remaining = state->out_remaining;
602
603 tevent_req_received(req);
604 return NT_STATUS_OK;
605 }
reg import