?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
ldb: version 1.1.20
[Samba.git] / source3 / libsmb / clireadwrite.c
blobadcd98bb0d9b6a2070405943568aa452a44936fe
1 /*
2 Unix SMB/CIFS implementation.
3 client file read/write routines
4 Copyright (C) Andrew Tridgell 1994-1998
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 "includes.h"
21 #include "libsmb/libsmb.h"
22 #include "../lib/util/tevent_ntstatus.h"
23 #include "async_smb.h"
24 #include "trans2.h"
25 #include "../libcli/smb/smbXcli_base.h"
26
27 /****************************************************************************
28 Calculate the recommended read buffer size
29 ****************************************************************************/
30 static size_t cli_read_max_bufsize(struct cli_state *cli)
31 {
32 uint8_t wct = 12;
33 uint32_t min_space;
34 uint32_t data_offset;
35 uint32_t useable_space = 0;
36
37 data_offset = HDR_VWV;
38 data_offset += wct * sizeof(uint16_t);
39 data_offset += sizeof(uint16_t); /* byte count */
40 data_offset += 1; /* pad */
41
42 min_space = cli_state_available_size(cli, data_offset);
43
44 if (cli->server_posix_capabilities & CIFS_UNIX_LARGE_READ_CAP) {
45 useable_space = 0xFFFFFF - data_offset;
46
47 if (smb1cli_conn_signing_is_active(cli->conn)) {
48 return min_space;
49 }
50
51 if (smb1cli_conn_encryption_on(cli->conn)) {
52 return min_space;
53 }
54
55 return useable_space;
56 } else if (smb1cli_conn_capabilities(cli->conn) & CAP_LARGE_READX) {
57 /*
58 * Note: CAP_LARGE_READX also works with signing
59 */
60 useable_space = 0x1FFFF - data_offset;
61
62 useable_space = MIN(useable_space, UINT16_MAX);
63
64 return useable_space;
65 }
66
67 return min_space;
68 }
69
70 /****************************************************************************
71 Calculate the recommended write buffer size
72 ****************************************************************************/
73 static size_t cli_write_max_bufsize(struct cli_state *cli,
74 uint16_t write_mode,
75 uint8_t wct)
76 {
77 uint32_t min_space;
78 uint32_t data_offset;
79 uint32_t useable_space = 0;
80
81 data_offset = HDR_VWV;
82 data_offset += wct * sizeof(uint16_t);
83 data_offset += sizeof(uint16_t); /* byte count */
84 data_offset += 1; /* pad */
85
86 min_space = cli_state_available_size(cli, data_offset);
87
88 if (cli->server_posix_capabilities & CIFS_UNIX_LARGE_WRITE_CAP) {
89 useable_space = 0xFFFFFF - data_offset;
90 } else if (smb1cli_conn_capabilities(cli->conn) & CAP_LARGE_WRITEX) {
91 useable_space = 0x1FFFF - data_offset;
92 } else {
93 return min_space;
94 }
95
96 if (write_mode != 0) {
97 return min_space;
98 }
99
100 if (smb1cli_conn_signing_is_active(cli->conn)) {
101 return min_space;
102 }
103
104 if (smb1cli_conn_encryption_on(cli->conn)) {
105 return min_space;
106 }
107
108 if (strequal(cli->dev, "LPT1:")) {
109 return min_space;
110 }
111
112 return useable_space;
113 }
114
115 struct cli_read_andx_state {
116 size_t size;
117 uint16_t vwv[12];
118 NTSTATUS status;
119 size_t received;
120 uint8_t *buf;
121 };
122
123 static void cli_read_andx_done(struct tevent_req *subreq);
124
125 struct tevent_req *cli_read_andx_create(TALLOC_CTX *mem_ctx,
126 struct tevent_context *ev,
127 struct cli_state *cli, uint16_t fnum,
128 off_t offset, size_t size,
129 struct tevent_req **psmbreq)
130 {
131 struct tevent_req *req, *subreq;
132 struct cli_read_andx_state *state;
133 uint8_t wct = 10;
134
135 req = tevent_req_create(mem_ctx, &state, struct cli_read_andx_state);
136 if (req == NULL) {
137 return NULL;
138 }
139 state->size = size;
140
141 SCVAL(state->vwv + 0, 0, 0xFF);
142 SCVAL(state->vwv + 0, 1, 0);
143 SSVAL(state->vwv + 1, 0, 0);
144 SSVAL(state->vwv + 2, 0, fnum);
145 SIVAL(state->vwv + 3, 0, offset);
146 SSVAL(state->vwv + 5, 0, size);
147 SSVAL(state->vwv + 6, 0, size);
148 SSVAL(state->vwv + 7, 0, (size >> 16));
149 SSVAL(state->vwv + 8, 0, 0);
150 SSVAL(state->vwv + 9, 0, 0);
151
152 if (smb1cli_conn_capabilities(cli->conn) & CAP_LARGE_FILES) {
153 SIVAL(state->vwv + 10, 0,
154 (((uint64_t)offset)>>32) & 0xffffffff);
155 wct = 12;
156 } else {
157 if ((((uint64_t)offset) & 0xffffffff00000000LL) != 0) {
158 DEBUG(10, ("cli_read_andx_send got large offset where "
159 "the server does not support it\n"));
160 tevent_req_nterror(req, NT_STATUS_INVALID_PARAMETER);
161 return tevent_req_post(req, ev);
162 }
163 }
164
165 subreq = cli_smb_req_create(state, ev, cli, SMBreadX, 0, wct,
166 state->vwv, 0, NULL);
167 if (subreq == NULL) {
168 TALLOC_FREE(req);
169 return NULL;
170 }
171 tevent_req_set_callback(subreq, cli_read_andx_done, req);
172 *psmbreq = subreq;
173 return req;
174 }
175
176 struct tevent_req *cli_read_andx_send(TALLOC_CTX *mem_ctx,
177 struct tevent_context *ev,
178 struct cli_state *cli, uint16_t fnum,
179 off_t offset, size_t size)
180 {
181 struct tevent_req *req, *subreq;
182 NTSTATUS status;
183
184 req = cli_read_andx_create(mem_ctx, ev, cli, fnum, offset, size,
185 &subreq);
186 if (req == NULL) {
187 return NULL;
188 }
189
190 status = smb1cli_req_chain_submit(&subreq, 1);
191 if (tevent_req_nterror(req, status)) {
192 return tevent_req_post(req, ev);
193 }
194 return req;
195 }
196
197 static void cli_read_andx_done(struct tevent_req *subreq)
198 {
199 struct tevent_req *req = tevent_req_callback_data(
200 subreq, struct tevent_req);
201 struct cli_read_andx_state *state = tevent_req_data(
202 req, struct cli_read_andx_state);
203 uint8_t *inbuf;
204 uint8_t wct;
205 uint16_t *vwv;
206 uint32_t num_bytes;
207 uint8_t *bytes;
208
209 state->status = cli_smb_recv(subreq, state, &inbuf, 12, &wct, &vwv,
210 &num_bytes, &bytes);
211 TALLOC_FREE(subreq);
212 if (NT_STATUS_IS_ERR(state->status)) {
213 tevent_req_nterror(req, state->status);
214 return;
215 }
216
217 /* size is the number of bytes the server returned.
218 * Might be zero. */
219 state->received = SVAL(vwv + 5, 0);
220 state->received |= (((unsigned int)SVAL(vwv + 7, 0)) << 16);
221
222 if (state->received > state->size) {
223 DEBUG(5,("server returned more than we wanted!\n"));
224 tevent_req_nterror(req, NT_STATUS_UNEXPECTED_IO_ERROR);
225 return;
226 }
227
228 /*
229 * bcc field must be valid for small reads, for large reads the 16-bit
230 * bcc field can't be correct.
231 */
232
233 if ((state->received < 0xffff) && (state->received > num_bytes)) {
234 DEBUG(5, ("server announced more bytes than sent\n"));
235 tevent_req_nterror(req, NT_STATUS_INVALID_NETWORK_RESPONSE);
236 return;
237 }
238
239 state->buf = discard_const_p(uint8_t, smb_base(inbuf)) + SVAL(vwv+6, 0);
240
241 if (trans_oob(smb_len_tcp(inbuf), SVAL(vwv+6, 0), state->received)
242 || ((state->received != 0) && (state->buf < bytes))) {
243 DEBUG(5, ("server returned invalid read&x data offset\n"));
244 tevent_req_nterror(req, NT_STATUS_INVALID_NETWORK_RESPONSE);
245 return;
246 }
247 tevent_req_done(req);
248 }
249
250 /*
251 * Pull the data out of a finished async read_and_x request. rcvbuf is
252 * talloced from the request, so better make sure that you copy it away before
253 * you talloc_free(req). "rcvbuf" is NOT a talloc_ctx of its own, so do not
254 * talloc_move it!
255 */
256
257 NTSTATUS cli_read_andx_recv(struct tevent_req *req, ssize_t *received,
258 uint8_t **rcvbuf)
259 {
260 struct cli_read_andx_state *state = tevent_req_data(
261 req, struct cli_read_andx_state);
262 NTSTATUS status;
263
264 if (tevent_req_is_nterror(req, &status)) {
265 return status;
266 }
267 *received = state->received;
268 *rcvbuf = state->buf;
269 return NT_STATUS_OK;
270 }
271
272 struct cli_pull_chunk;
273
274 struct cli_pull_state {
275 struct tevent_context *ev;
276 struct cli_state *cli;
277 uint16_t fnum;
278 off_t start_offset;
279 off_t size;
280
281 NTSTATUS (*sink)(char *buf, size_t n, void *priv);
282 void *priv;
283
284 size_t chunk_size;
285 off_t next_offset;
286 off_t remaining;
287
288 /*
289 * How many bytes did we push into "sink"?
290 */
291 off_t pushed;
292
293 /*
294 * Outstanding requests
295 *
296 * The maximum is 256:
297 * - which would be a window of 256 MByte
298 * for SMB2 with multi-credit
299 * or smb1 unix extentions.
300 */
301 uint16_t max_chunks;
302 uint16_t num_chunks;
303 uint16_t num_waiting;
304 struct cli_pull_chunk *chunks;
305 };
306
307 struct cli_pull_chunk {
308 struct cli_pull_chunk *prev, *next;
309 struct tevent_req *req;/* This is the main request! Not the subreq */
310 struct tevent_req *subreq;
311 off_t ofs;
312 uint8_t *buf;
313 size_t total_size;
314 size_t tmp_size;
315 bool done;
316 };
317
318 static void cli_pull_setup_chunks(struct tevent_req *req);
319 static void cli_pull_chunk_ship(struct cli_pull_chunk *chunk);
320 static void cli_pull_chunk_done(struct tevent_req *subreq);
321
322 /*
323 * Parallel read support.
324 *
325 * cli_pull sends as many read&x requests as the server would allow via
326 * max_mux at a time. When replies flow back in, the data is written into
327 * the callback function "sink" in the right order.
328 */
329
330 struct tevent_req *cli_pull_send(TALLOC_CTX *mem_ctx,
331 struct tevent_context *ev,
332 struct cli_state *cli,
333 uint16_t fnum, off_t start_offset,
334 off_t size, size_t window_size,
335 NTSTATUS (*sink)(char *buf, size_t n,
336 void *priv),
337 void *priv)
338 {
339 struct tevent_req *req;
340 struct cli_pull_state *state;
341 size_t page_size = 1024;
342 uint64_t tmp64;
343
344 req = tevent_req_create(mem_ctx, &state, struct cli_pull_state);
345 if (req == NULL) {
346 return NULL;
347 }
348 state->cli = cli;
349 state->ev = ev;
350 state->fnum = fnum;
351 state->start_offset = start_offset;
352 state->size = size;
353 state->sink = sink;
354 state->priv = priv;
355 state->next_offset = start_offset;
356 state->remaining = size;
357
358 if (size == 0) {
359 tevent_req_done(req);
360 return tevent_req_post(req, ev);
361 }
362
363 if (smbXcli_conn_protocol(state->cli->conn) >= PROTOCOL_SMB2_02) {
364 state->chunk_size = smb2cli_conn_max_read_size(cli->conn);
365 } else {
366 state->chunk_size = cli_read_max_bufsize(cli);
367 }
368 if (state->chunk_size > page_size) {
369 state->chunk_size &= ~(page_size - 1);
370 }
371
372 if (window_size == 0) {
373 /*
374 * We use 16 MByte as default window size.
375 */
376 window_size = 16 * 1024 * 1024;
377 }
378
379 tmp64 = window_size/state->chunk_size;
380 if ((window_size % state->chunk_size) > 0) {
381 tmp64 += 1;
382 }
383 tmp64 = MAX(tmp64, 1);
384 tmp64 = MIN(tmp64, 256);
385 state->max_chunks = tmp64;
386
387 /*
388 * We defer the callback because of the complex
389 * substate/subfunction logic
390 */
391 tevent_req_defer_callback(req, ev);
392
393 cli_pull_setup_chunks(req);
394 if (!tevent_req_is_in_progress(req)) {
395 return tevent_req_post(req, ev);
396 }
397
398 return req;
399 }
400
401 static void cli_pull_setup_chunks(struct tevent_req *req)
402 {
403 struct cli_pull_state *state =
404 tevent_req_data(req,
405 struct cli_pull_state);
406 struct cli_pull_chunk *chunk, *next = NULL;
407 size_t i;
408
409 for (chunk = state->chunks; chunk; chunk = next) {
410 /*
411 * Note that chunk might be removed from this call.
412 */
413 next = chunk->next;
414 cli_pull_chunk_ship(chunk);
415 if (!tevent_req_is_in_progress(req)) {
416 return;
417 }
418 }
419
420 for (i = state->num_chunks; i < state->max_chunks; i++) {
421
422 if (state->num_waiting > 0) {
423 return;
424 }
425
426 if (state->remaining == 0) {
427 break;
428 }
429
430 chunk = talloc_zero(state, struct cli_pull_chunk);
431 if (tevent_req_nomem(chunk, req)) {
432 return;
433 }
434 chunk->req = req;
435 chunk->ofs = state->next_offset;
436 chunk->total_size = MIN(state->remaining, state->chunk_size);
437 state->next_offset += chunk->total_size;
438 state->remaining -= chunk->total_size;
439
440 DLIST_ADD_END(state->chunks, chunk, NULL);
441 state->num_chunks++;
442 state->num_waiting++;
443
444 cli_pull_chunk_ship(chunk);
445 if (!tevent_req_is_in_progress(req)) {
446 return;
447 }
448 }
449
450 if (state->remaining > 0) {
451 return;
452 }
453
454 if (state->num_chunks > 0) {
455 return;
456 }
457
458 tevent_req_done(req);
459 }
460
461 static void cli_pull_chunk_ship(struct cli_pull_chunk *chunk)
462 {
463 struct tevent_req *req = chunk->req;
464 struct cli_pull_state *state =
465 tevent_req_data(req,
466 struct cli_pull_state);
467 bool ok;
468 off_t ofs;
469 size_t size;
470
471 if (chunk->done) {
472 NTSTATUS status;
473
474 if (chunk != state->chunks) {
475 /*
476 * this chunk is not the
477 * first one in the list.
478 *
479 * which means we should not
480 * push it into the sink yet.
481 */
482 return;
483 }
484
485 if (chunk->tmp_size == 0) {
486 /*
487 * we git a short read, we're done
488 */
489 tevent_req_done(req);
490 return;
491 }
492
493 status = state->sink((char *)chunk->buf,
494 chunk->tmp_size,
495 state->priv);
496 if (tevent_req_nterror(req, status)) {
497 return;
498 }
499 state->pushed += chunk->tmp_size;
500
501 if (chunk->tmp_size < chunk->total_size) {
502 /*
503 * we git a short read, we're done
504 */
505 tevent_req_done(req);
506 return;
507 }
508
509 DLIST_REMOVE(state->chunks, chunk);
510 SMB_ASSERT(state->num_chunks > 0);
511 state->num_chunks--;
512 TALLOC_FREE(chunk);
513
514 return;
515 }
516
517 if (chunk->subreq != NULL) {
518 return;
519 }
520
521 SMB_ASSERT(state->num_waiting > 0);
522
523 ofs = chunk->ofs + chunk->tmp_size;
524 size = chunk->total_size - chunk->tmp_size;
525
526 if (smbXcli_conn_protocol(state->cli->conn) >= PROTOCOL_SMB2_02) {
527 uint32_t max_size;
528
529 ok = smb2cli_conn_req_possible(state->cli->conn, &max_size);
530 if (!ok) {
531 return;
532 }
533
534 /*
535 * downgrade depending on the available credits
536 */
537 size = MIN(max_size, size);
538
539 chunk->subreq = cli_smb2_read_send(chunk,
540 state->ev,
541 state->cli,
542 state->fnum,
543 ofs,
544 size);
545 if (tevent_req_nomem(chunk->subreq, req)) {
546 return;
547 }
548 } else {
549 ok = smb1cli_conn_req_possible(state->cli->conn);
550 if (!ok) {
551 return;
552 }
553
554 chunk->subreq = cli_read_andx_send(chunk,
555 state->ev,
556 state->cli,
557 state->fnum,
558 ofs,
559 size);
560 if (tevent_req_nomem(chunk->subreq, req)) {
561 return;
562 }
563 }
564 tevent_req_set_callback(chunk->subreq,
565 cli_pull_chunk_done,
566 chunk);
567
568 state->num_waiting--;
569 return;
570 }
571
572 static void cli_pull_chunk_done(struct tevent_req *subreq)
573 {
574 struct cli_pull_chunk *chunk =
575 tevent_req_callback_data(subreq,
576 struct cli_pull_chunk);
577 struct tevent_req *req = chunk->req;
578 struct cli_pull_state *state =
579 tevent_req_data(req,
580 struct cli_pull_state);
581 NTSTATUS status;
582 size_t expected = chunk->total_size - chunk->tmp_size;
583 ssize_t received;
584 uint8_t *buf = NULL;
585
586 chunk->subreq = NULL;
587
588 if (smbXcli_conn_protocol(state->cli->conn) >= PROTOCOL_SMB2_02) {
589 status = cli_smb2_read_recv(subreq, &received, &buf);
590 } else {
591 status = cli_read_andx_recv(subreq, &received, &buf);
592 }
593 if (NT_STATUS_EQUAL(status, NT_STATUS_END_OF_FILE)) {
594 received = 0;
595 status = NT_STATUS_OK;
596 }
597 if (tevent_req_nterror(req, status)) {
598 return;
599 }
600
601 if (received > expected) {
602 tevent_req_nterror(req, NT_STATUS_INVALID_NETWORK_RESPONSE);
603 return;
604 }
605
606 if (received == 0) {
607 /*
608 * We got EOF we're done
609 */
610 chunk->done = true;
611 cli_pull_setup_chunks(req);
612 return;
613 }
614
615 if (received == chunk->total_size) {
616 /*
617 * We got it in the first run.
618 *
619 * We don't call TALLOC_FREE(subreq)
620 * here and keep the returned buffer.
621 */
622 chunk->buf = buf;
623 } else if (chunk->buf == NULL) {
624 chunk->buf = talloc_array(chunk, uint8_t, chunk->total_size);
625 if (tevent_req_nomem(chunk->buf, req)) {
626 return;
627 }
628 }
629
630 if (received != chunk->total_size) {
631 uint8_t *p = chunk->buf + chunk->tmp_size;
632 memcpy(p, buf, received);
633 TALLOC_FREE(subreq);
634 }
635
636 chunk->tmp_size += received;
637
638 if (chunk->tmp_size == chunk->total_size) {
639 chunk->done = true;
640 } else {
641 state->num_waiting++;
642 }
643
644 cli_pull_setup_chunks(req);
645 }
646
647 NTSTATUS cli_pull_recv(struct tevent_req *req, off_t *received)
648 {
649 struct cli_pull_state *state = tevent_req_data(
650 req, struct cli_pull_state);
651 NTSTATUS status;
652
653 if (tevent_req_is_nterror(req, &status)) {
654 tevent_req_received(req);
655 return status;
656 }
657 *received = state->pushed;
658 tevent_req_received(req);
659 return NT_STATUS_OK;
660 }
661
662 NTSTATUS cli_pull(struct cli_state *cli, uint16_t fnum,
663 off_t start_offset, off_t size, size_t window_size,
664 NTSTATUS (*sink)(char *buf, size_t n, void *priv),
665 void *priv, off_t *received)
666 {
667 TALLOC_CTX *frame = talloc_stackframe();
668 struct tevent_context *ev;
669 struct tevent_req *req;
670 NTSTATUS status = NT_STATUS_OK;
671
672 if (smbXcli_conn_has_async_calls(cli->conn)) {
673 /*
674 * Can't use sync call while an async call is in flight
675 */
676 status = NT_STATUS_INVALID_PARAMETER;
677 goto fail;
678 }
679
680 ev = samba_tevent_context_init(frame);
681 if (ev == NULL) {
682 status = NT_STATUS_NO_MEMORY;
683 goto fail;
684 }
685
686 req = cli_pull_send(frame, ev, cli, fnum, start_offset, size,
687 window_size, sink, priv);
688 if (req == NULL) {
689 status = NT_STATUS_NO_MEMORY;
690 goto fail;
691 }
692
693 if (!tevent_req_poll(req, ev)) {
694 status = map_nt_error_from_unix(errno);
695 goto fail;
696 }
697
698 status = cli_pull_recv(req, received);
699 fail:
700 TALLOC_FREE(frame);
701 return status;
702 }
703
704 static NTSTATUS cli_read_sink(char *buf, size_t n, void *priv)
705 {
706 char **pbuf = (char **)priv;
707 memcpy(*pbuf, buf, n);
708 *pbuf += n;
709 return NT_STATUS_OK;
710 }
711
712 NTSTATUS cli_read(struct cli_state *cli, uint16_t fnum,
713 char *buf, off_t offset, size_t size,
714 size_t *nread)
715 {
716 NTSTATUS status;
717 off_t ret;
718
719 status = cli_pull(cli, fnum, offset, size, size,
720 cli_read_sink, &buf, &ret);
721 if (!NT_STATUS_IS_OK(status)) {
722 return status;
723 }
724
725 if (nread) {
726 *nread = ret;
727 }
728
729 return NT_STATUS_OK;
730 }
731
732 /****************************************************************************
733 write to a file using a SMBwrite and not bypassing 0 byte writes
734 ****************************************************************************/
735
736 NTSTATUS cli_smbwrite(struct cli_state *cli, uint16_t fnum, char *buf,
737 off_t offset, size_t size1, size_t *ptotal)
738 {
739 uint8_t *bytes;
740 ssize_t total = 0;
741
742 /*
743 * 3 bytes prefix
744 */
745
746 bytes = talloc_array(talloc_tos(), uint8_t, 3);
747 if (bytes == NULL) {
748 return NT_STATUS_NO_MEMORY;
749 }
750 bytes[0] = 1;
751
752 do {
753 uint32_t usable_space = cli_state_available_size(cli, 48);
754 size_t size = MIN(size1, usable_space);
755 struct tevent_req *req;
756 uint16_t vwv[5];
757 uint16_t *ret_vwv;
758 NTSTATUS status;
759
760 SSVAL(vwv+0, 0, fnum);
761 SSVAL(vwv+1, 0, size);
762 SIVAL(vwv+2, 0, offset);
763 SSVAL(vwv+4, 0, 0);
764
765 bytes = talloc_realloc(talloc_tos(), bytes, uint8_t,
766 size+3);
767 if (bytes == NULL) {
768 return NT_STATUS_NO_MEMORY;
769 }
770 SSVAL(bytes, 1, size);
771 memcpy(bytes + 3, buf + total, size);
772
773 status = cli_smb(talloc_tos(), cli, SMBwrite, 0, 5, vwv,
774 size+3, bytes, &req, 1, NULL, &ret_vwv,
775 NULL, NULL);
776 if (!NT_STATUS_IS_OK(status)) {
777 TALLOC_FREE(bytes);
778 return status;
779 }
780
781 size = SVAL(ret_vwv+0, 0);
782 TALLOC_FREE(req);
783 if (size == 0) {
784 break;
785 }
786 size1 -= size;
787 total += size;
788 offset += size;
789
790 } while (size1);
791
792 TALLOC_FREE(bytes);
793
794 if (ptotal != NULL) {
795 *ptotal = total;
796 }
797 return NT_STATUS_OK;
798 }
799
800 /*
801 * Send a write&x request
802 */
803
804 struct cli_write_andx_state {
805 size_t size;
806 uint16_t vwv[14];
807 size_t written;
808 uint8_t pad;
809 struct iovec iov[2];
810 };
811
812 static void cli_write_andx_done(struct tevent_req *subreq);
813
814 struct tevent_req *cli_write_andx_create(TALLOC_CTX *mem_ctx,
815 struct tevent_context *ev,
816 struct cli_state *cli, uint16_t fnum,
817 uint16_t mode, const uint8_t *buf,
818 off_t offset, size_t size,
819 struct tevent_req **reqs_before,
820 int num_reqs_before,
821 struct tevent_req **psmbreq)
822 {
823 struct tevent_req *req, *subreq;
824 struct cli_write_andx_state *state;
825 bool bigoffset = ((smb1cli_conn_capabilities(cli->conn) & CAP_LARGE_FILES) != 0);
826 uint8_t wct = bigoffset ? 14 : 12;
827 size_t max_write = cli_write_max_bufsize(cli, mode, wct);
828 uint16_t *vwv;
829
830 req = tevent_req_create(mem_ctx, &state, struct cli_write_andx_state);
831 if (req == NULL) {
832 return NULL;
833 }
834
835 state->size = MIN(size, max_write);
836
837 vwv = state->vwv;
838
839 SCVAL(vwv+0, 0, 0xFF);
840 SCVAL(vwv+0, 1, 0);
841 SSVAL(vwv+1, 0, 0);
842 SSVAL(vwv+2, 0, fnum);
843 SIVAL(vwv+3, 0, offset);
844 SIVAL(vwv+5, 0, 0);
845 SSVAL(vwv+7, 0, mode);
846 SSVAL(vwv+8, 0, 0);
847 SSVAL(vwv+9, 0, (state->size>>16));
848 SSVAL(vwv+10, 0, state->size);
849
850 SSVAL(vwv+11, 0,
851 smb1cli_req_wct_ofs(reqs_before, num_reqs_before)
852 + 1 /* the wct field */
853 + wct * 2 /* vwv */
854 + 2 /* num_bytes field */
855 + 1 /* pad */);
856
857 if (bigoffset) {
858 SIVAL(vwv+12, 0, (((uint64_t)offset)>>32) & 0xffffffff);
859 }
860
861 state->pad = 0;
862 state->iov[0].iov_base = (void *)&state->pad;
863 state->iov[0].iov_len = 1;
864 state->iov[1].iov_base = discard_const_p(void, buf);
865 state->iov[1].iov_len = state->size;
866
867 subreq = cli_smb_req_create(state, ev, cli, SMBwriteX, 0, wct, vwv,
868 2, state->iov);
869 if (tevent_req_nomem(subreq, req)) {
870 return tevent_req_post(req, ev);
871 }
872 tevent_req_set_callback(subreq, cli_write_andx_done, req);
873 *psmbreq = subreq;
874 return req;
875 }
876
877 struct tevent_req *cli_write_andx_send(TALLOC_CTX *mem_ctx,
878 struct tevent_context *ev,
879 struct cli_state *cli, uint16_t fnum,
880 uint16_t mode, const uint8_t *buf,
881 off_t offset, size_t size)
882 {
883 struct tevent_req *req, *subreq;
884 NTSTATUS status;
885
886 req = cli_write_andx_create(mem_ctx, ev, cli, fnum, mode, buf, offset,
887 size, NULL, 0, &subreq);
888 if (req == NULL) {
889 return NULL;
890 }
891
892 status = smb1cli_req_chain_submit(&subreq, 1);
893 if (tevent_req_nterror(req, status)) {
894 return tevent_req_post(req, ev);
895 }
896 return req;
897 }
898
899 static void cli_write_andx_done(struct tevent_req *subreq)
900 {
901 struct tevent_req *req = tevent_req_callback_data(
902 subreq, struct tevent_req);
903 struct cli_write_andx_state *state = tevent_req_data(
904 req, struct cli_write_andx_state);
905 uint8_t wct;
906 uint16_t *vwv;
907 NTSTATUS status;
908
909 status = cli_smb_recv(subreq, state, NULL, 6, &wct, &vwv,
910 NULL, NULL);
911 TALLOC_FREE(subreq);
912 if (NT_STATUS_IS_ERR(status)) {
913 tevent_req_nterror(req, status);
914 return;
915 }
916 state->written = SVAL(vwv+2, 0);
917 if (state->size > UINT16_MAX) {
918 /*
919 * It is important that we only set the
920 * high bits only if we asked for a large write.
921 *
922 * OS/2 print shares get this wrong and may send
923 * invalid values.
924 *
925 * See bug #5326.
926 */
927 state->written |= SVAL(vwv+4, 0)<<16;
928 }
929 tevent_req_done(req);
930 }
931
932 NTSTATUS cli_write_andx_recv(struct tevent_req *req, size_t *pwritten)
933 {
934 struct cli_write_andx_state *state = tevent_req_data(
935 req, struct cli_write_andx_state);
936 NTSTATUS status;
937
938 if (tevent_req_is_nterror(req, &status)) {
939 return status;
940 }
941 if (pwritten != 0) {
942 *pwritten = state->written;
943 }
944 return NT_STATUS_OK;
945 }
946
947 struct cli_writeall_state {
948 struct tevent_context *ev;
949 struct cli_state *cli;
950 uint16_t fnum;
951 uint16_t mode;
952 const uint8_t *buf;
953 off_t offset;
954 size_t size;
955 size_t written;
956 };
957
958 static void cli_writeall_written(struct tevent_req *req);
959
960 static struct tevent_req *cli_writeall_send(TALLOC_CTX *mem_ctx,
961 struct tevent_context *ev,
962 struct cli_state *cli,
963 uint16_t fnum,
964 uint16_t mode,
965 const uint8_t *buf,
966 off_t offset, size_t size)
967 {
968 struct tevent_req *req, *subreq;
969 struct cli_writeall_state *state;
970
971 req = tevent_req_create(mem_ctx, &state, struct cli_writeall_state);
972 if (req == NULL) {
973 return NULL;
974 }
975 state->ev = ev;
976 state->cli = cli;
977 state->fnum = fnum;
978 state->mode = mode;
979 state->buf = buf;
980 state->offset = offset;
981 state->size = size;
982 state->written = 0;
983
984 subreq = cli_write_andx_send(state, state->ev, state->cli, state->fnum,
985 state->mode, state->buf, state->offset,
986 state->size);
987 if (tevent_req_nomem(subreq, req)) {
988 return tevent_req_post(req, ev);
989 }
990 tevent_req_set_callback(subreq, cli_writeall_written, req);
991 return req;
992 }
993
994 static void cli_writeall_written(struct tevent_req *subreq)
995 {
996 struct tevent_req *req = tevent_req_callback_data(
997 subreq, struct tevent_req);
998 struct cli_writeall_state *state = tevent_req_data(
999 req, struct cli_writeall_state);
1000 NTSTATUS status;
1001 size_t written, to_write;
1002
1003 status = cli_write_andx_recv(subreq, &written);
1004 TALLOC_FREE(subreq);
1005 if (tevent_req_nterror(req, status)) {
1006 return;
1007 }
1008
1009 state->written += written;
1010
1011 if (state->written > state->size) {
1012 tevent_req_nterror(req, NT_STATUS_INVALID_NETWORK_RESPONSE);
1013 return;
1014 }
1015
1016 to_write = state->size - state->written;
1017
1018 if (to_write == 0) {
1019 tevent_req_done(req);
1020 return;
1021 }
1022
1023 subreq = cli_write_andx_send(state, state->ev, state->cli, state->fnum,
1024 state->mode,
1025 state->buf + state->written,
1026 state->offset + state->written, to_write);
1027 if (tevent_req_nomem(subreq, req)) {
1028 return;
1029 }
1030 tevent_req_set_callback(subreq, cli_writeall_written, req);
1031 }
1032
1033 static NTSTATUS cli_writeall_recv(struct tevent_req *req,
1034 size_t *pwritten)
1035 {
1036 struct cli_writeall_state *state = tevent_req_data(
1037 req, struct cli_writeall_state);
1038 NTSTATUS status;
1039
1040 if (tevent_req_is_nterror(req, &status)) {
1041 return status;
1042 }
1043 if (pwritten != NULL) {
1044 *pwritten = state->written;
1045 }
1046 return NT_STATUS_OK;
1047 }
1048
1049 NTSTATUS cli_writeall(struct cli_state *cli, uint16_t fnum, uint16_t mode,
1050 const uint8_t *buf, off_t offset, size_t size,
1051 size_t *pwritten)
1052 {
1053 TALLOC_CTX *frame = talloc_stackframe();
1054 struct tevent_context *ev;
1055 struct tevent_req *req;
1056 NTSTATUS status = NT_STATUS_NO_MEMORY;
1057
1058 if (smbXcli_conn_has_async_calls(cli->conn)) {
1059 /*
1060 * Can't use sync call while an async call is in flight
1061 */
1062 status = NT_STATUS_INVALID_PARAMETER;
1063 goto fail;
1064 }
1065 ev = samba_tevent_context_init(frame);
1066 if (ev == NULL) {
1067 goto fail;
1068 }
1069 if (smbXcli_conn_protocol(cli->conn) >= PROTOCOL_SMB2_02) {
1070 req = cli_smb2_writeall_send(frame, ev, cli, fnum, mode,
1071 buf, offset, size);
1072 } else {
1073 req = cli_writeall_send(frame, ev, cli, fnum, mode,
1074 buf, offset, size);
1075 }
1076 if (req == NULL) {
1077 goto fail;
1078 }
1079 if (!tevent_req_poll(req, ev)) {
1080 status = map_nt_error_from_unix(errno);
1081 goto fail;
1082 }
1083 if (smbXcli_conn_protocol(cli->conn) >= PROTOCOL_SMB2_02) {
1084 status = cli_smb2_writeall_recv(req, pwritten);
1085 } else {
1086 status = cli_writeall_recv(req, pwritten);
1087 }
1088 fail:
1089 TALLOC_FREE(frame);
1090 return status;
1091 }
1092
1093 struct cli_push_chunk;
1094
1095 struct cli_push_state {
1096 struct tevent_context *ev;
1097 struct cli_state *cli;
1098 uint16_t fnum;
1099 uint16_t mode;
1100 off_t start_offset;
1101
1102 size_t (*source)(uint8_t *buf, size_t n, void *priv);
1103 void *priv;
1104
1105 bool eof;
1106
1107 size_t chunk_size;
1108 off_t next_offset;
1109
1110 /*
1111 * Outstanding requests
1112 *
1113 * The maximum is 256:
1114 * - which would be a window of 256 MByte
1115 * for SMB2 with multi-credit
1116 * or smb1 unix extentions.
1117 */
1118 uint16_t max_chunks;
1119 uint16_t num_chunks;
1120 uint16_t num_waiting;
1121 struct cli_push_chunk *chunks;
1122 };
1123
1124 struct cli_push_chunk {
1125 struct cli_push_chunk *prev, *next;
1126 struct tevent_req *req;/* This is the main request! Not the subreq */
1127 struct tevent_req *subreq;
1128 off_t ofs;
1129 uint8_t *buf;
1130 size_t total_size;
1131 size_t tmp_size;
1132 bool done;
1133 };
1134
1135 static void cli_push_setup_chunks(struct tevent_req *req);
1136 static void cli_push_chunk_ship(struct cli_push_chunk *chunk);
1137 static void cli_push_chunk_done(struct tevent_req *subreq);
1138
1139 struct tevent_req *cli_push_send(TALLOC_CTX *mem_ctx, struct tevent_context *ev,
1140 struct cli_state *cli,
1141 uint16_t fnum, uint16_t mode,
1142 off_t start_offset, size_t window_size,
1143 size_t (*source)(uint8_t *buf, size_t n,
1144 void *priv),
1145 void *priv)
1146 {
1147 struct tevent_req *req;
1148 struct cli_push_state *state;
1149 size_t page_size = 1024;
1150 uint64_t tmp64;
1151
1152 req = tevent_req_create(mem_ctx, &state, struct cli_push_state);
1153 if (req == NULL) {
1154 return NULL;
1155 }
1156 state->cli = cli;
1157 state->ev = ev;
1158 state->fnum = fnum;
1159 state->start_offset = start_offset;
1160 state->mode = mode;
1161 state->source = source;
1162 state->priv = priv;
1163 state->next_offset = start_offset;
1164
1165 if (smbXcli_conn_protocol(state->cli->conn) >= PROTOCOL_SMB2_02) {
1166 state->chunk_size = smb2cli_conn_max_write_size(cli->conn);
1167 } else {
1168 state->chunk_size = cli_write_max_bufsize(cli, mode, 14);
1169 }
1170 if (state->chunk_size > page_size) {
1171 state->chunk_size &= ~(page_size - 1);
1172 }
1173
1174 if (window_size == 0) {
1175 /*
1176 * We use 16 MByte as default window size.
1177 */
1178 window_size = 16 * 1024 * 1024;
1179 }
1180
1181 tmp64 = window_size/state->chunk_size;
1182 if ((window_size % state->chunk_size) > 0) {
1183 tmp64 += 1;
1184 }
1185 tmp64 = MAX(tmp64, 1);
1186 tmp64 = MIN(tmp64, 256);
1187 state->max_chunks = tmp64;
1188
1189 /*
1190 * We defer the callback because of the complex
1191 * substate/subfunction logic
1192 */
1193 tevent_req_defer_callback(req, ev);
1194
1195 cli_push_setup_chunks(req);
1196 if (!tevent_req_is_in_progress(req)) {
1197 return tevent_req_post(req, ev);
1198 }
1199
1200 return req;
1201 }
1202
1203 static void cli_push_setup_chunks(struct tevent_req *req)
1204 {
1205 struct cli_push_state *state =
1206 tevent_req_data(req,
1207 struct cli_push_state);
1208 struct cli_push_chunk *chunk, *next = NULL;
1209 size_t i;
1210
1211 for (chunk = state->chunks; chunk; chunk = next) {
1212 /*
1213 * Note that chunk might be removed from this call.
1214 */
1215 next = chunk->next;
1216 cli_push_chunk_ship(chunk);
1217 if (!tevent_req_is_in_progress(req)) {
1218 return;
1219 }
1220 }
1221
1222 for (i = state->num_chunks; i < state->max_chunks; i++) {
1223
1224 if (state->num_waiting > 0) {
1225 return;
1226 }
1227
1228 if (state->eof) {
1229 break;
1230 }
1231
1232 chunk = talloc_zero(state, struct cli_push_chunk);
1233 if (tevent_req_nomem(chunk, req)) {
1234 return;
1235 }
1236 chunk->req = req;
1237 chunk->ofs = state->next_offset;
1238 chunk->buf = talloc_array(chunk,
1239 uint8_t,
1240 state->chunk_size);
1241 if (tevent_req_nomem(chunk->buf, req)) {
1242 return;
1243 }
1244 chunk->total_size = state->source(chunk->buf,
1245 state->chunk_size,
1246 state->priv);
1247 if (chunk->total_size == 0) {
1248 /* nothing to send */
1249 talloc_free(chunk);
1250 state->eof = true;
1251 break;
1252 }
1253 state->next_offset += chunk->total_size;
1254
1255 DLIST_ADD_END(state->chunks, chunk, NULL);
1256 state->num_chunks++;
1257 state->num_waiting++;
1258
1259 cli_push_chunk_ship(chunk);
1260 if (!tevent_req_is_in_progress(req)) {
1261 return;
1262 }
1263 }
1264
1265 if (!state->eof) {
1266 return;
1267 }
1268
1269 if (state->num_chunks > 0) {
1270 return;
1271 }
1272
1273 tevent_req_done(req);
1274 }
1275
1276 static void cli_push_chunk_ship(struct cli_push_chunk *chunk)
1277 {
1278 struct tevent_req *req = chunk->req;
1279 struct cli_push_state *state =
1280 tevent_req_data(req,
1281 struct cli_push_state);
1282 bool ok;
1283 const uint8_t *buf;
1284 off_t ofs;
1285 size_t size;
1286
1287 if (chunk->done) {
1288 DLIST_REMOVE(state->chunks, chunk);
1289 SMB_ASSERT(state->num_chunks > 0);
1290 state->num_chunks--;
1291 TALLOC_FREE(chunk);
1292
1293 return;
1294 }
1295
1296 if (chunk->subreq != NULL) {
1297 return;
1298 }
1299
1300 SMB_ASSERT(state->num_waiting > 0);
1301
1302 buf = chunk->buf + chunk->tmp_size;
1303 ofs = chunk->ofs + chunk->tmp_size;
1304 size = chunk->total_size - chunk->tmp_size;
1305
1306 if (smbXcli_conn_protocol(state->cli->conn) >= PROTOCOL_SMB2_02) {
1307 uint32_t max_size;
1308
1309 ok = smb2cli_conn_req_possible(state->cli->conn, &max_size);
1310 if (!ok) {
1311 return;
1312 }
1313
1314 /*
1315 * downgrade depending on the available credits
1316 */
1317 size = MIN(max_size, size);
1318
1319 chunk->subreq = cli_smb2_write_send(chunk,
1320 state->ev,
1321 state->cli,
1322 state->fnum,
1323 state->mode,
1324 buf,
1325 ofs,
1326 size);
1327 if (tevent_req_nomem(chunk->subreq, req)) {
1328 return;
1329 }
1330 } else {
1331 ok = smb1cli_conn_req_possible(state->cli->conn);
1332 if (!ok) {
1333 return;
1334 }
1335
1336 chunk->subreq = cli_write_andx_send(chunk,
1337 state->ev,
1338 state->cli,
1339 state->fnum,
1340 state->mode,
1341 buf,
1342 ofs,
1343 size);
1344 if (tevent_req_nomem(chunk->subreq, req)) {
1345 return;
1346 }
1347 }
1348 tevent_req_set_callback(chunk->subreq,
1349 cli_push_chunk_done,
1350 chunk);
1351
1352 state->num_waiting--;
1353 return;
1354 }
1355
1356 static void cli_push_chunk_done(struct tevent_req *subreq)
1357 {
1358 struct cli_push_chunk *chunk =
1359 tevent_req_callback_data(subreq,
1360 struct cli_push_chunk);
1361 struct tevent_req *req = chunk->req;
1362 struct cli_push_state *state =
1363 tevent_req_data(req,
1364 struct cli_push_state);
1365 NTSTATUS status;
1366 size_t expected = chunk->total_size - chunk->tmp_size;
1367 size_t written;
1368
1369 chunk->subreq = NULL;
1370
1371 if (smbXcli_conn_protocol(state->cli->conn) >= PROTOCOL_SMB2_02) {
1372 status = cli_smb2_write_recv(subreq, &written);
1373 } else {
1374 status = cli_write_andx_recv(subreq, &written);
1375 }
1376 TALLOC_FREE(subreq);
1377 if (tevent_req_nterror(req, status)) {
1378 return;
1379 }
1380
1381 if (written > expected) {
1382 tevent_req_nterror(req, NT_STATUS_INVALID_NETWORK_RESPONSE);
1383 return;
1384 }
1385
1386 if (written == 0) {
1387 tevent_req_nterror(req, NT_STATUS_INVALID_NETWORK_RESPONSE);
1388 return;
1389 }
1390
1391 chunk->tmp_size += written;
1392
1393 if (chunk->tmp_size == chunk->total_size) {
1394 chunk->done = true;
1395 } else {
1396 state->num_waiting++;
1397 }
1398
1399 cli_push_setup_chunks(req);
1400 }
1401
1402 NTSTATUS cli_push_recv(struct tevent_req *req)
1403 {
1404 return tevent_req_simple_recv_ntstatus(req);
1405 }
1406
1407 NTSTATUS cli_push(struct cli_state *cli, uint16_t fnum, uint16_t mode,
1408 off_t start_offset, size_t window_size,
1409 size_t (*source)(uint8_t *buf, size_t n, void *priv),
1410 void *priv)
1411 {
1412 TALLOC_CTX *frame = talloc_stackframe();
1413 struct tevent_context *ev;
1414 struct tevent_req *req;
1415 NTSTATUS status = NT_STATUS_OK;
1416
1417 if (smbXcli_conn_has_async_calls(cli->conn)) {
1418 /*
1419 * Can't use sync call while an async call is in flight
1420 */
1421 status = NT_STATUS_INVALID_PARAMETER;
1422 goto fail;
1423 }
1424
1425 ev = samba_tevent_context_init(frame);
1426 if (ev == NULL) {
1427 status = NT_STATUS_NO_MEMORY;
1428 goto fail;
1429 }
1430
1431 req = cli_push_send(frame, ev, cli, fnum, mode, start_offset,
1432 window_size, source, priv);
1433 if (req == NULL) {
1434 status = NT_STATUS_NO_MEMORY;
1435 goto fail;
1436 }
1437
1438 if (!tevent_req_poll(req, ev)) {
1439 status = map_nt_error_from_unix(errno);
1440 goto fail;
1441 }
1442
1443 status = cli_push_recv(req);
1444 fail:
1445 TALLOC_FREE(frame);
1446 return status;
1447 }
Samba GIT mirror