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Fix re-opened bug 8083 - "inherit owner = yes" doesn't interact correctly with vfs_ac...
[Samba.git] / source3 / libsmb / clireadwrite.c
blob1f5f9252d49f9f41b659b184d263d51260024445
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
22 /****************************************************************************
23 Calculate the recommended read buffer size
24 ****************************************************************************/
25 static size_t cli_read_max_bufsize(struct cli_state *cli)
26 {
27 if (!client_is_signing_on(cli) && !cli_encryption_on(cli)
28 && (cli->posix_capabilities & CIFS_UNIX_LARGE_READ_CAP)) {
29 return CLI_SAMBA_MAX_POSIX_LARGE_READX_SIZE;
30 }
31 if (cli->capabilities & CAP_LARGE_READX) {
32 return cli->is_samba
33 ? CLI_SAMBA_MAX_LARGE_READX_SIZE
34 : CLI_WINDOWS_MAX_LARGE_READX_SIZE;
35 }
36 return (cli->max_xmit - (smb_size+32)) & ~1023;
37 }
38
39 /****************************************************************************
40 Calculate the recommended write buffer size
41 ****************************************************************************/
42 static size_t cli_write_max_bufsize(struct cli_state *cli, uint16_t write_mode)
43 {
44 if (write_mode == 0 &&
45 !client_is_signing_on(cli) &&
46 !cli_encryption_on(cli) &&
47 (cli->posix_capabilities & CIFS_UNIX_LARGE_WRITE_CAP) &&
48 (cli->capabilities & CAP_LARGE_FILES)) {
49 /* Only do massive writes if we can do them direct
50 * with no signing or encrypting - not on a pipe. */
51 return CLI_SAMBA_MAX_POSIX_LARGE_WRITEX_SIZE;
52 }
53
54 if (cli->is_samba) {
55 return CLI_SAMBA_MAX_LARGE_WRITEX_SIZE;
56 }
57
58 if (((cli->capabilities & CAP_LARGE_WRITEX) == 0)
59 || client_is_signing_on(cli)
60 || strequal(cli->dev, "LPT1:")) {
61
62 /*
63 * Printer devices are restricted to max_xmit writesize in
64 * Vista and XPSP3 as are signing connections.
65 */
66
67 return (cli->max_xmit - (smb_size+32)) & ~1023;
68 }
69
70 return CLI_WINDOWS_MAX_LARGE_WRITEX_SIZE;
71 }
72
73 struct cli_read_andx_state {
74 size_t size;
75 uint16_t vwv[12];
76 NTSTATUS status;
77 size_t received;
78 uint8_t *buf;
79 };
80
81 static void cli_read_andx_done(struct tevent_req *subreq);
82
83 struct tevent_req *cli_read_andx_create(TALLOC_CTX *mem_ctx,
84 struct event_context *ev,
85 struct cli_state *cli, uint16_t fnum,
86 off_t offset, size_t size,
87 struct tevent_req **psmbreq)
88 {
89 struct tevent_req *req, *subreq;
90 struct cli_read_andx_state *state;
91 bool bigoffset = False;
92 uint8_t wct = 10;
93
94 if (size > cli_read_max_bufsize(cli)) {
95 DEBUG(0, ("cli_read_andx_send got size=%d, can only handle "
96 "size=%d\n", (int)size,
97 (int)cli_read_max_bufsize(cli)));
98 return NULL;
99 }
100
101 req = tevent_req_create(mem_ctx, &state, struct cli_read_andx_state);
102 if (req == NULL) {
103 return NULL;
104 }
105 state->size = size;
106
107 SCVAL(state->vwv + 0, 0, 0xFF);
108 SCVAL(state->vwv + 0, 1, 0);
109 SSVAL(state->vwv + 1, 0, 0);
110 SSVAL(state->vwv + 2, 0, fnum);
111 SIVAL(state->vwv + 3, 0, offset);
112 SSVAL(state->vwv + 5, 0, size);
113 SSVAL(state->vwv + 6, 0, size);
114 SSVAL(state->vwv + 7, 0, (size >> 16));
115 SSVAL(state->vwv + 8, 0, 0);
116 SSVAL(state->vwv + 9, 0, 0);
117
118 if ((uint64_t)offset >> 32) {
119 bigoffset = true;
120 SIVAL(state->vwv + 10, 0,
121 (((uint64_t)offset)>>32) & 0xffffffff);
122 wct += 2;
123 }
124
125 subreq = cli_smb_req_create(state, ev, cli, SMBreadX, 0, wct,
126 state->vwv, 0, NULL);
127 if (subreq == NULL) {
128 TALLOC_FREE(req);
129 return NULL;
130 }
131 tevent_req_set_callback(subreq, cli_read_andx_done, req);
132 *psmbreq = subreq;
133 return req;
134 }
135
136 struct tevent_req *cli_read_andx_send(TALLOC_CTX *mem_ctx,
137 struct event_context *ev,
138 struct cli_state *cli, uint16_t fnum,
139 off_t offset, size_t size)
140 {
141 struct tevent_req *req, *subreq;
142 NTSTATUS status;
143
144 req = cli_read_andx_create(mem_ctx, ev, cli, fnum, offset, size,
145 &subreq);
146 if (req == NULL) {
147 return NULL;
148 }
149
150 status = cli_smb_req_send(subreq);
151 if (!NT_STATUS_IS_OK(status)) {
152 tevent_req_nterror(req, status);
153 return tevent_req_post(req, ev);
154 }
155 return req;
156 }
157
158 static void cli_read_andx_done(struct tevent_req *subreq)
159 {
160 struct tevent_req *req = tevent_req_callback_data(
161 subreq, struct tevent_req);
162 struct cli_read_andx_state *state = tevent_req_data(
163 req, struct cli_read_andx_state);
164 uint8_t *inbuf;
165 uint8_t wct;
166 uint16_t *vwv;
167 uint32_t num_bytes;
168 uint8_t *bytes;
169
170 state->status = cli_smb_recv(subreq, 12, &wct, &vwv, &num_bytes,
171 &bytes);
172 if (NT_STATUS_IS_ERR(state->status)) {
173 tevent_req_nterror(req, state->status);
174 return;
175 }
176
177 /* size is the number of bytes the server returned.
178 * Might be zero. */
179 state->received = SVAL(vwv + 5, 0);
180 state->received |= (((unsigned int)SVAL(vwv + 7, 0)) << 16);
181
182 if (state->received > state->size) {
183 DEBUG(5,("server returned more than we wanted!\n"));
184 tevent_req_nterror(req, NT_STATUS_UNEXPECTED_IO_ERROR);
185 return;
186 }
187
188 /*
189 * bcc field must be valid for small reads, for large reads the 16-bit
190 * bcc field can't be correct.
191 */
192
193 if ((state->received < 0xffff) && (state->received > num_bytes)) {
194 DEBUG(5, ("server announced more bytes than sent\n"));
195 tevent_req_nterror(req, NT_STATUS_INVALID_NETWORK_RESPONSE);
196 return;
197 }
198
199 inbuf = cli_smb_inbuf(subreq);
200 state->buf = (uint8_t *)smb_base(inbuf) + SVAL(vwv+6, 0);
201
202 if (trans_oob(smb_len(inbuf), SVAL(vwv+6, 0), state->received)
203 || ((state->received != 0) && (state->buf < bytes))) {
204 DEBUG(5, ("server returned invalid read&x data offset\n"));
205 tevent_req_nterror(req, NT_STATUS_INVALID_NETWORK_RESPONSE);
206 return;
207 }
208 tevent_req_done(req);
209 }
210
211 /*
212 * Pull the data out of a finished async read_and_x request. rcvbuf is
213 * talloced from the request, so better make sure that you copy it away before
214 * you talloc_free(req). "rcvbuf" is NOT a talloc_ctx of its own, so do not
215 * talloc_move it!
216 */
217
218 NTSTATUS cli_read_andx_recv(struct tevent_req *req, ssize_t *received,
219 uint8_t **rcvbuf)
220 {
221 struct cli_read_andx_state *state = tevent_req_data(
222 req, struct cli_read_andx_state);
223 NTSTATUS status;
224
225 if (tevent_req_is_nterror(req, &status)) {
226 return status;
227 }
228 *received = state->received;
229 *rcvbuf = state->buf;
230 return NT_STATUS_OK;
231 }
232
233 struct cli_readall_state {
234 struct tevent_context *ev;
235 struct cli_state *cli;
236 uint16_t fnum;
237 off_t start_offset;
238 size_t size;
239 size_t received;
240 uint8_t *buf;
241 };
242
243 static void cli_readall_done(struct tevent_req *subreq);
244
245 static struct tevent_req *cli_readall_send(TALLOC_CTX *mem_ctx,
246 struct event_context *ev,
247 struct cli_state *cli,
248 uint16_t fnum,
249 off_t offset, size_t size)
250 {
251 struct tevent_req *req, *subreq;
252 struct cli_readall_state *state;
253
254 req = tevent_req_create(mem_ctx, &state, struct cli_readall_state);
255 if (req == NULL) {
256 return NULL;
257 }
258 state->ev = ev;
259 state->cli = cli;
260 state->fnum = fnum;
261 state->start_offset = offset;
262 state->size = size;
263 state->received = 0;
264 state->buf = NULL;
265
266 subreq = cli_read_andx_send(state, ev, cli, fnum, offset, size);
267 if (tevent_req_nomem(subreq, req)) {
268 return tevent_req_post(req, ev);
269 }
270 tevent_req_set_callback(subreq, cli_readall_done, req);
271 return req;
272 }
273
274 static void cli_readall_done(struct tevent_req *subreq)
275 {
276 struct tevent_req *req = tevent_req_callback_data(
277 subreq, struct tevent_req);
278 struct cli_readall_state *state = tevent_req_data(
279 req, struct cli_readall_state);
280 ssize_t received;
281 uint8_t *buf;
282 NTSTATUS status;
283
284 status = cli_read_andx_recv(subreq, &received, &buf);
285 if (!NT_STATUS_IS_OK(status)) {
286 tevent_req_nterror(req, status);
287 return;
288 }
289
290 if (received == 0) {
291 /* EOF */
292 tevent_req_done(req);
293 return;
294 }
295
296 if ((state->received == 0) && (received == state->size)) {
297 /* Ideal case: Got it all in one run */
298 state->buf = buf;
299 state->received += received;
300 tevent_req_done(req);
301 return;
302 }
303
304 /*
305 * We got a short read, issue a read for the
306 * rest. Unfortunately we have to allocate the buffer
307 * ourselves now, as our caller expects to receive a single
308 * buffer. cli_read_andx does it from the buffer received from
309 * the net, but with a short read we have to put it together
310 * from several reads.
311 */
312
313 if (state->buf == NULL) {
314 state->buf = talloc_array(state, uint8_t, state->size);
315 if (tevent_req_nomem(state->buf, req)) {
316 return;
317 }
318 }
319 memcpy(state->buf + state->received, buf, received);
320 state->received += received;
321
322 TALLOC_FREE(subreq);
323
324 if (state->received >= state->size) {
325 tevent_req_done(req);
326 return;
327 }
328
329 subreq = cli_read_andx_send(state, state->ev, state->cli, state->fnum,
330 state->start_offset + state->received,
331 state->size - state->received);
332 if (tevent_req_nomem(subreq, req)) {
333 return;
334 }
335 tevent_req_set_callback(subreq, cli_readall_done, req);
336 }
337
338 static NTSTATUS cli_readall_recv(struct tevent_req *req, ssize_t *received,
339 uint8_t **rcvbuf)
340 {
341 struct cli_readall_state *state = tevent_req_data(
342 req, struct cli_readall_state);
343 NTSTATUS status;
344
345 if (tevent_req_is_nterror(req, &status)) {
346 return status;
347 }
348 *received = state->received;
349 *rcvbuf = state->buf;
350 return NT_STATUS_OK;
351 }
352
353 struct cli_pull_subreq {
354 struct tevent_req *req;
355 ssize_t received;
356 uint8_t *buf;
357 };
358
359 /*
360 * Parallel read support.
361 *
362 * cli_pull sends as many read&x requests as the server would allow via
363 * max_mux at a time. When replies flow back in, the data is written into
364 * the callback function "sink" in the right order.
365 */
366
367 struct cli_pull_state {
368 struct tevent_req *req;
369
370 struct event_context *ev;
371 struct cli_state *cli;
372 uint16_t fnum;
373 off_t start_offset;
374 SMB_OFF_T size;
375
376 NTSTATUS (*sink)(char *buf, size_t n, void *priv);
377 void *priv;
378
379 size_t chunk_size;
380
381 /*
382 * Outstanding requests
383 */
384 int num_reqs;
385 struct cli_pull_subreq *reqs;
386
387 /*
388 * For how many bytes did we send requests already?
389 */
390 SMB_OFF_T requested;
391
392 /*
393 * Next request index to push into "sink". This walks around the "req"
394 * array, taking care that the requests are pushed to "sink" in the
395 * right order. If necessary (i.e. replies don't come in in the right
396 * order), replies are held back in "reqs".
397 */
398 int top_req;
399
400 /*
401 * How many bytes did we push into "sink"?
402 */
403
404 SMB_OFF_T pushed;
405 };
406
407 static char *cli_pull_print(struct tevent_req *req, TALLOC_CTX *mem_ctx)
408 {
409 struct cli_pull_state *state = tevent_req_data(
410 req, struct cli_pull_state);
411 char *result;
412
413 result = tevent_req_print(mem_ctx, req);
414 if (result == NULL) {
415 return NULL;
416 }
417
418 return talloc_asprintf_append_buffer(
419 result, "num_reqs=%d, top_req=%d",
420 state->num_reqs, state->top_req);
421 }
422
423 static void cli_pull_read_done(struct tevent_req *read_req);
424
425 /*
426 * Prepare an async pull request
427 */
428
429 struct tevent_req *cli_pull_send(TALLOC_CTX *mem_ctx,
430 struct event_context *ev,
431 struct cli_state *cli,
432 uint16_t fnum, off_t start_offset,
433 SMB_OFF_T size, size_t window_size,
434 NTSTATUS (*sink)(char *buf, size_t n,
435 void *priv),
436 void *priv)
437 {
438 struct tevent_req *req;
439 struct cli_pull_state *state;
440 int i;
441
442 req = tevent_req_create(mem_ctx, &state, struct cli_pull_state);
443 if (req == NULL) {
444 return NULL;
445 }
446 tevent_req_set_print_fn(req, cli_pull_print);
447 state->req = req;
448
449 state->cli = cli;
450 state->ev = ev;
451 state->fnum = fnum;
452 state->start_offset = start_offset;
453 state->size = size;
454 state->sink = sink;
455 state->priv = priv;
456
457 state->pushed = 0;
458 state->top_req = 0;
459
460 if (size == 0) {
461 tevent_req_done(req);
462 return tevent_req_post(req, ev);
463 }
464
465 state->chunk_size = cli_read_max_bufsize(cli);
466
467 state->num_reqs = MAX(window_size/state->chunk_size, 1);
468 state->num_reqs = MIN(state->num_reqs, cli->max_mux);
469
470 state->reqs = TALLOC_ZERO_ARRAY(state, struct cli_pull_subreq,
471 state->num_reqs);
472 if (state->reqs == NULL) {
473 goto failed;
474 }
475
476 state->requested = 0;
477
478 for (i=0; i<state->num_reqs; i++) {
479 struct cli_pull_subreq *subreq = &state->reqs[i];
480 SMB_OFF_T size_left;
481 size_t request_thistime;
482
483 if (state->requested >= size) {
484 state->num_reqs = i;
485 break;
486 }
487
488 size_left = size - state->requested;
489 request_thistime = MIN(size_left, state->chunk_size);
490
491 subreq->req = cli_readall_send(
492 state->reqs, ev, cli, fnum,
493 state->start_offset + state->requested,
494 request_thistime);
495
496 if (subreq->req == NULL) {
497 goto failed;
498 }
499 tevent_req_set_callback(subreq->req, cli_pull_read_done, req);
500 state->requested += request_thistime;
501 }
502 return req;
503
504 failed:
505 TALLOC_FREE(req);
506 return NULL;
507 }
508
509 /*
510 * Handle incoming read replies, push the data into sink and send out new
511 * requests if necessary.
512 */
513
514 static void cli_pull_read_done(struct tevent_req *subreq)
515 {
516 struct tevent_req *req = tevent_req_callback_data(
517 subreq, struct tevent_req);
518 struct cli_pull_state *state = tevent_req_data(
519 req, struct cli_pull_state);
520 struct cli_pull_subreq *pull_subreq = NULL;
521 NTSTATUS status;
522 int i;
523
524 for (i = 0; i < state->num_reqs; i++) {
525 pull_subreq = &state->reqs[i];
526 if (subreq == pull_subreq->req) {
527 break;
528 }
529 }
530 if (i == state->num_reqs) {
531 /* Huh -- received something we did not send?? */
532 tevent_req_nterror(req, NT_STATUS_INTERNAL_ERROR);
533 return;
534 }
535
536 status = cli_readall_recv(subreq, &pull_subreq->received,
537 &pull_subreq->buf);
538 if (!NT_STATUS_IS_OK(status)) {
539 tevent_req_nterror(state->req, status);
540 return;
541 }
542
543 /*
544 * This loop is the one to take care of out-of-order replies. All
545 * pending requests are in state->reqs, state->reqs[top_req] is the
546 * one that is to be pushed next. If however a request later than
547 * top_req is replied to, then we can't push yet. If top_req is
548 * replied to at a later point then, we need to push all the finished
549 * requests.
550 */
551
552 while (state->reqs[state->top_req].req != NULL) {
553 struct cli_pull_subreq *top_subreq;
554
555 DEBUG(11, ("cli_pull_read_done: top_req = %d\n",
556 state->top_req));
557
558 top_subreq = &state->reqs[state->top_req];
559
560 if (tevent_req_is_in_progress(top_subreq->req)) {
561 DEBUG(11, ("cli_pull_read_done: top request not yet "
562 "done\n"));
563 return;
564 }
565
566 DEBUG(10, ("cli_pull_read_done: Pushing %d bytes, %d already "
567 "pushed\n", (int)top_subreq->received,
568 (int)state->pushed));
569
570 status = state->sink((char *)top_subreq->buf,
571 top_subreq->received, state->priv);
572 if (!NT_STATUS_IS_OK(status)) {
573 tevent_req_nterror(state->req, status);
574 return;
575 }
576 state->pushed += top_subreq->received;
577
578 TALLOC_FREE(state->reqs[state->top_req].req);
579
580 if (state->requested < state->size) {
581 struct tevent_req *new_req;
582 SMB_OFF_T size_left;
583 size_t request_thistime;
584
585 size_left = state->size - state->requested;
586 request_thistime = MIN(size_left, state->chunk_size);
587
588 DEBUG(10, ("cli_pull_read_done: Requesting %d bytes "
589 "at %d, position %d\n",
590 (int)request_thistime,
591 (int)(state->start_offset
592 + state->requested),
593 state->top_req));
594
595 new_req = cli_readall_send(
596 state->reqs, state->ev, state->cli,
597 state->fnum,
598 state->start_offset + state->requested,
599 request_thistime);
600
601 if (tevent_req_nomem(new_req, state->req)) {
602 return;
603 }
604 tevent_req_set_callback(new_req, cli_pull_read_done,
605 req);
606
607 state->reqs[state->top_req].req = new_req;
608 state->requested += request_thistime;
609 }
610
611 state->top_req = (state->top_req+1) % state->num_reqs;
612 }
613
614 tevent_req_done(req);
615 }
616
617 NTSTATUS cli_pull_recv(struct tevent_req *req, SMB_OFF_T *received)
618 {
619 struct cli_pull_state *state = tevent_req_data(
620 req, struct cli_pull_state);
621 NTSTATUS status;
622
623 if (tevent_req_is_nterror(req, &status)) {
624 return status;
625 }
626 *received = state->pushed;
627 return NT_STATUS_OK;
628 }
629
630 NTSTATUS cli_pull(struct cli_state *cli, uint16_t fnum,
631 off_t start_offset, SMB_OFF_T size, size_t window_size,
632 NTSTATUS (*sink)(char *buf, size_t n, void *priv),
633 void *priv, SMB_OFF_T *received)
634 {
635 TALLOC_CTX *frame = talloc_stackframe();
636 struct event_context *ev;
637 struct tevent_req *req;
638 NTSTATUS status = NT_STATUS_OK;
639
640 if (cli_has_async_calls(cli)) {
641 /*
642 * Can't use sync call while an async call is in flight
643 */
644 status = NT_STATUS_INVALID_PARAMETER;
645 goto fail;
646 }
647
648 ev = event_context_init(frame);
649 if (ev == NULL) {
650 status = NT_STATUS_NO_MEMORY;
651 goto fail;
652 }
653
654 req = cli_pull_send(frame, ev, cli, fnum, start_offset, size,
655 window_size, sink, priv);
656 if (req == NULL) {
657 status = NT_STATUS_NO_MEMORY;
658 goto fail;
659 }
660
661 if (!tevent_req_poll(req, ev)) {
662 status = map_nt_error_from_unix(errno);
663 goto fail;
664 }
665
666 status = cli_pull_recv(req, received);
667 fail:
668 TALLOC_FREE(frame);
669 if (!NT_STATUS_IS_OK(status)) {
670 cli_set_error(cli, status);
671 }
672 return status;
673 }
674
675 static NTSTATUS cli_read_sink(char *buf, size_t n, void *priv)
676 {
677 char **pbuf = (char **)priv;
678 memcpy(*pbuf, buf, n);
679 *pbuf += n;
680 return NT_STATUS_OK;
681 }
682
683 ssize_t cli_read(struct cli_state *cli, uint16_t fnum, char *buf,
684 off_t offset, size_t size)
685 {
686 NTSTATUS status;
687 SMB_OFF_T ret;
688
689 status = cli_pull(cli, fnum, offset, size, size,
690 cli_read_sink, &buf, &ret);
691 if (!NT_STATUS_IS_OK(status)) {
692 cli_set_error(cli, status);
693 return -1;
694 }
695 return ret;
696 }
697
698 /****************************************************************************
699 Issue a single SMBwrite and don't wait for a reply.
700 ****************************************************************************/
701
702 static bool cli_issue_write(struct cli_state *cli,
703 uint16_t fnum,
704 off_t offset,
705 uint16 mode,
706 const char *buf,
707 size_t size)
708 {
709 char *p;
710 bool large_writex = false;
711 /* We can only do direct writes if not signing and not encrypting. */
712 bool direct_writes = !client_is_signing_on(cli) && !cli_encryption_on(cli);
713
714 if (!direct_writes && size + 1 > cli->bufsize) {
715 cli->outbuf = (char *)SMB_REALLOC(cli->outbuf, size + 1024);
716 if (!cli->outbuf) {
717 return False;
718 }
719 cli->inbuf = (char *)SMB_REALLOC(cli->inbuf, size + 1024);
720 if (cli->inbuf == NULL) {
721 SAFE_FREE(cli->outbuf);
722 return False;
723 }
724 cli->bufsize = size + 1024;
725 }
726
727 memset(cli->outbuf,'\0',smb_size);
728 memset(cli->inbuf,'\0',smb_size);
729
730 if (cli->capabilities & CAP_LARGE_FILES) {
731 large_writex = True;
732 }
733
734 if (large_writex) {
735 cli_set_message(cli->outbuf,14,0,True);
736 } else {
737 cli_set_message(cli->outbuf,12,0,True);
738 }
739
740 SCVAL(cli->outbuf,smb_com,SMBwriteX);
741 SSVAL(cli->outbuf,smb_tid,cli->cnum);
742 cli_setup_packet(cli);
743
744 SCVAL(cli->outbuf,smb_vwv0,0xFF);
745 SSVAL(cli->outbuf,smb_vwv2,fnum);
746
747 SIVAL(cli->outbuf,smb_vwv3,offset);
748 SIVAL(cli->outbuf,smb_vwv5,0);
749 SSVAL(cli->outbuf,smb_vwv7,mode);
750
751 SSVAL(cli->outbuf,smb_vwv8,(mode & 0x0008) ? size : 0);
752 /*
753 * According to CIFS-TR-1p00, this following field should only
754 * be set if CAP_LARGE_WRITEX is set. We should check this
755 * locally. However, this check might already have been
756 * done by our callers.
757 */
758 SSVAL(cli->outbuf,smb_vwv9,(size>>16));
759 SSVAL(cli->outbuf,smb_vwv10,size);
760 /* +1 is pad byte. */
761 SSVAL(cli->outbuf,smb_vwv11,
762 smb_buf(cli->outbuf) - smb_base(cli->outbuf) + 1);
763
764 if (large_writex) {
765 SIVAL(cli->outbuf,smb_vwv12,(((uint64_t)offset)>>32) & 0xffffffff);
766 }
767
768 p = smb_base(cli->outbuf) + SVAL(cli->outbuf,smb_vwv11) -1;
769 *p++ = '\0'; /* pad byte. */
770 if (!direct_writes) {
771 memcpy(p, buf, size);
772 }
773 if (size > 0x1FFFF) {
774 /* This is a POSIX 14 word large write. */
775 set_message_bcc(cli->outbuf, 0); /* Set bcc to zero. */
776 _smb_setlen_large(cli->outbuf,smb_size + 28 + 1 /* pad */ + size - 4);
777 } else {
778 cli_setup_bcc(cli, p+size);
779 }
780
781 show_msg(cli->outbuf);
782 if (direct_writes) {
783 /* For direct writes we now need to write the data
784 * directly out of buf. */
785 return cli_send_smb_direct_writeX(cli, buf, size);
786 } else {
787 return cli_send_smb(cli);
788 }
789 }
790
791 /****************************************************************************
792 write to a file
793 write_mode: 0x0001 disallow write cacheing
794 0x0002 return bytes remaining
795 0x0004 use raw named pipe protocol
796 0x0008 start of message mode named pipe protocol
797 ****************************************************************************/
798
799 ssize_t cli_write(struct cli_state *cli,
800 uint16_t fnum, uint16 write_mode,
801 const char *buf, off_t offset, size_t size)
802 {
803 ssize_t bwritten = 0;
804 unsigned int issued = 0;
805 unsigned int received = 0;
806 int mpx = 1;
807 size_t writesize;
808 int blocks;
809
810 if(cli->max_mux > 1) {
811 mpx = cli->max_mux-1;
812 } else {
813 mpx = 1;
814 }
815
816 writesize = cli_write_max_bufsize(cli, write_mode);
817
818 blocks = (size + (writesize-1)) / writesize;
819
820 while (received < blocks) {
821
822 while ((issued - received < mpx) && (issued < blocks)) {
823 ssize_t bsent = issued * writesize;
824 ssize_t size1 = MIN(writesize, size - bsent);
825
826 if (!cli_issue_write(cli, fnum, offset + bsent,
827 write_mode,
828 buf + bsent,
829 size1))
830 return -1;
831 issued++;
832 }
833
834 if (!cli_receive_smb(cli)) {
835 return bwritten;
836 }
837
838 received++;
839
840 if (cli_is_error(cli))
841 break;
842
843 bwritten += SVAL(cli->inbuf, smb_vwv2);
844 if (writesize > 0xFFFF) {
845 bwritten += (((int)(SVAL(cli->inbuf, smb_vwv4)))<<16);
846 }
847 }
848
849 while (received < issued && cli_receive_smb(cli)) {
850 received++;
851 }
852
853 return bwritten;
854 }
855
856 /****************************************************************************
857 write to a file using a SMBwrite and not bypassing 0 byte writes
858 ****************************************************************************/
859
860 ssize_t cli_smbwrite(struct cli_state *cli,
861 uint16_t fnum, char *buf, off_t offset, size_t size1)
862 {
863 char *p;
864 ssize_t total = 0;
865
866 do {
867 size_t size = MIN(size1, cli->max_xmit - 48);
868
869 memset(cli->outbuf,'\0',smb_size);
870 memset(cli->inbuf,'\0',smb_size);
871
872 cli_set_message(cli->outbuf,5, 0,True);
873
874 SCVAL(cli->outbuf,smb_com,SMBwrite);
875 SSVAL(cli->outbuf,smb_tid,cli->cnum);
876 cli_setup_packet(cli);
877
878 SSVAL(cli->outbuf,smb_vwv0,fnum);
879 SSVAL(cli->outbuf,smb_vwv1,size);
880 SIVAL(cli->outbuf,smb_vwv2,offset);
881 SSVAL(cli->outbuf,smb_vwv4,0);
882
883 p = smb_buf(cli->outbuf);
884 *p++ = 1;
885 SSVAL(p, 0, size); p += 2;
886 memcpy(p, buf + total, size); p += size;
887
888 cli_setup_bcc(cli, p);
889
890 if (!cli_send_smb(cli))
891 return -1;
892
893 if (!cli_receive_smb(cli))
894 return -1;
895
896 if (cli_is_error(cli))
897 return -1;
898
899 size = SVAL(cli->inbuf,smb_vwv0);
900 if (size == 0)
901 break;
902
903 size1 -= size;
904 total += size;
905 offset += size;
906
907 } while (size1);
908
909 return total;
910 }
911
912 /*
913 * Send a write&x request
914 */
915
916 struct cli_write_andx_state {
917 size_t size;
918 uint16_t vwv[14];
919 size_t written;
920 uint8_t pad;
921 struct iovec iov[2];
922 };
923
924 static void cli_write_andx_done(struct tevent_req *subreq);
925
926 struct tevent_req *cli_write_andx_create(TALLOC_CTX *mem_ctx,
927 struct event_context *ev,
928 struct cli_state *cli, uint16_t fnum,
929 uint16_t mode, const uint8_t *buf,
930 off_t offset, size_t size,
931 struct tevent_req **reqs_before,
932 int num_reqs_before,
933 struct tevent_req **psmbreq)
934 {
935 struct tevent_req *req, *subreq;
936 struct cli_write_andx_state *state;
937 bool bigoffset = ((cli->capabilities & CAP_LARGE_FILES) != 0);
938 uint8_t wct = bigoffset ? 14 : 12;
939 size_t max_write = cli_write_max_bufsize(cli, mode);
940 uint16_t *vwv;
941
942 req = tevent_req_create(mem_ctx, &state, struct cli_write_andx_state);
943 if (req == NULL) {
944 return NULL;
945 }
946
947 size = MIN(size, max_write);
948
949 vwv = state->vwv;
950
951 SCVAL(vwv+0, 0, 0xFF);
952 SCVAL(vwv+0, 1, 0);
953 SSVAL(vwv+1, 0, 0);
954 SSVAL(vwv+2, 0, fnum);
955 SIVAL(vwv+3, 0, offset);
956 SIVAL(vwv+5, 0, 0);
957 SSVAL(vwv+7, 0, mode);
958 SSVAL(vwv+8, 0, 0);
959 SSVAL(vwv+9, 0, (size>>16));
960 SSVAL(vwv+10, 0, size);
961
962 SSVAL(vwv+11, 0,
963 cli_smb_wct_ofs(reqs_before, num_reqs_before)
964 + 1 /* the wct field */
965 + wct * 2 /* vwv */
966 + 2 /* num_bytes field */
967 + 1 /* pad */);
968
969 if (bigoffset) {
970 SIVAL(vwv+12, 0, (((uint64_t)offset)>>32) & 0xffffffff);
971 }
972
973 state->pad = 0;
974 state->iov[0].iov_base = (void *)&state->pad;
975 state->iov[0].iov_len = 1;
976 state->iov[1].iov_base = CONST_DISCARD(void *, buf);
977 state->iov[1].iov_len = size;
978
979 subreq = cli_smb_req_create(state, ev, cli, SMBwriteX, 0, wct, vwv,
980 2, state->iov);
981 if (tevent_req_nomem(subreq, req)) {
982 return tevent_req_post(req, ev);
983 }
984 tevent_req_set_callback(subreq, cli_write_andx_done, req);
985 *psmbreq = subreq;
986 return req;
987 }
988
989 struct tevent_req *cli_write_andx_send(TALLOC_CTX *mem_ctx,
990 struct event_context *ev,
991 struct cli_state *cli, uint16_t fnum,
992 uint16_t mode, const uint8_t *buf,
993 off_t offset, size_t size)
994 {
995 struct tevent_req *req, *subreq;
996 NTSTATUS status;
997
998 req = cli_write_andx_create(mem_ctx, ev, cli, fnum, mode, buf, offset,
999 size, NULL, 0, &subreq);
1000 if (req == NULL) {
1001 return NULL;
1002 }
1003
1004 status = cli_smb_req_send(subreq);
1005 if (!NT_STATUS_IS_OK(status)) {
1006 tevent_req_nterror(req, status);
1007 return tevent_req_post(req, ev);
1008 }
1009 return req;
1010 }
1011
1012 static void cli_write_andx_done(struct tevent_req *subreq)
1013 {
1014 struct tevent_req *req = tevent_req_callback_data(
1015 subreq, struct tevent_req);
1016 struct cli_write_andx_state *state = tevent_req_data(
1017 req, struct cli_write_andx_state);
1018 uint8_t wct;
1019 uint16_t *vwv;
1020 NTSTATUS status;
1021
1022 status = cli_smb_recv(subreq, 6, &wct, &vwv, NULL, NULL);
1023 if (NT_STATUS_IS_ERR(status)) {
1024 TALLOC_FREE(subreq);
1025 tevent_req_nterror(req, status);
1026 return;
1027 }
1028 state->written = SVAL(vwv+2, 0);
1029 state->written |= SVAL(vwv+4, 0)<<16;
1030 tevent_req_done(req);
1031 }
1032
1033 NTSTATUS cli_write_andx_recv(struct tevent_req *req, size_t *pwritten)
1034 {
1035 struct cli_write_andx_state *state = tevent_req_data(
1036 req, struct cli_write_andx_state);
1037 NTSTATUS status;
1038
1039 if (tevent_req_is_nterror(req, &status)) {
1040 return status;
1041 }
1042 *pwritten = state->written;
1043 return NT_STATUS_OK;
1044 }
1045
1046 struct cli_writeall_state {
1047 struct event_context *ev;
1048 struct cli_state *cli;
1049 uint16_t fnum;
1050 uint16_t mode;
1051 const uint8_t *buf;
1052 off_t offset;
1053 size_t size;
1054 size_t written;
1055 };
1056
1057 static void cli_writeall_written(struct tevent_req *req);
1058
1059 static struct tevent_req *cli_writeall_send(TALLOC_CTX *mem_ctx,
1060 struct event_context *ev,
1061 struct cli_state *cli,
1062 uint16_t fnum,
1063 uint16_t mode,
1064 const uint8_t *buf,
1065 off_t offset, size_t size)
1066 {
1067 struct tevent_req *req, *subreq;
1068 struct cli_writeall_state *state;
1069
1070 req = tevent_req_create(mem_ctx, &state, struct cli_writeall_state);
1071 if (req == NULL) {
1072 return NULL;
1073 }
1074 state->ev = ev;
1075 state->cli = cli;
1076 state->fnum = fnum;
1077 state->mode = mode;
1078 state->buf = buf;
1079 state->offset = offset;
1080 state->size = size;
1081 state->written = 0;
1082
1083 subreq = cli_write_andx_send(state, state->ev, state->cli, state->fnum,
1084 state->mode, state->buf, state->offset,
1085 state->size);
1086 if (tevent_req_nomem(subreq, req)) {
1087 return tevent_req_post(req, ev);
1088 }
1089 tevent_req_set_callback(subreq, cli_writeall_written, req);
1090 return req;
1091 }
1092
1093 static void cli_writeall_written(struct tevent_req *subreq)
1094 {
1095 struct tevent_req *req = tevent_req_callback_data(
1096 subreq, struct tevent_req);
1097 struct cli_writeall_state *state = tevent_req_data(
1098 req, struct cli_writeall_state);
1099 NTSTATUS status;
1100 size_t written, to_write;
1101
1102 status = cli_write_andx_recv(subreq, &written);
1103 TALLOC_FREE(subreq);
1104 if (!NT_STATUS_IS_OK(status)) {
1105 tevent_req_nterror(req, status);
1106 return;
1107 }
1108
1109 state->written += written;
1110
1111 if (state->written > state->size) {
1112 tevent_req_nterror(req, NT_STATUS_INVALID_NETWORK_RESPONSE);
1113 return;
1114 }
1115
1116 to_write = state->size - state->written;
1117
1118 if (to_write == 0) {
1119 tevent_req_done(req);
1120 return;
1121 }
1122
1123 subreq = cli_write_andx_send(state, state->ev, state->cli, state->fnum,
1124 state->mode,
1125 state->buf + state->written,
1126 state->offset + state->written, to_write);
1127 if (tevent_req_nomem(subreq, req)) {
1128 return;
1129 }
1130 tevent_req_set_callback(subreq, cli_writeall_written, req);
1131 }
1132
1133 static NTSTATUS cli_writeall_recv(struct tevent_req *req)
1134 {
1135 return tevent_req_simple_recv_ntstatus(req);
1136 }
1137
1138 struct cli_push_write_state {
1139 struct tevent_req *req;/* This is the main request! Not the subreq */
1140 uint32_t idx;
1141 off_t ofs;
1142 uint8_t *buf;
1143 size_t size;
1144 };
1145
1146 struct cli_push_state {
1147 struct event_context *ev;
1148 struct cli_state *cli;
1149 uint16_t fnum;
1150 uint16_t mode;
1151 off_t start_offset;
1152 size_t window_size;
1153
1154 size_t (*source)(uint8_t *buf, size_t n, void *priv);
1155 void *priv;
1156
1157 bool eof;
1158
1159 size_t chunk_size;
1160 off_t next_offset;
1161
1162 /*
1163 * Outstanding requests
1164 */
1165 uint32_t pending;
1166 uint32_t num_reqs;
1167 struct cli_push_write_state **reqs;
1168 };
1169
1170 static void cli_push_written(struct tevent_req *req);
1171
1172 static bool cli_push_write_setup(struct tevent_req *req,
1173 struct cli_push_state *state,
1174 uint32_t idx)
1175 {
1176 struct cli_push_write_state *substate;
1177 struct tevent_req *subreq;
1178
1179 substate = talloc(state->reqs, struct cli_push_write_state);
1180 if (!substate) {
1181 return false;
1182 }
1183 substate->req = req;
1184 substate->idx = idx;
1185 substate->ofs = state->next_offset;
1186 substate->buf = talloc_array(substate, uint8_t, state->chunk_size);
1187 if (!substate->buf) {
1188 talloc_free(substate);
1189 return false;
1190 }
1191 substate->size = state->source(substate->buf,
1192 state->chunk_size,
1193 state->priv);
1194 if (substate->size == 0) {
1195 state->eof = true;
1196 /* nothing to send */
1197 talloc_free(substate);
1198 return true;
1199 }
1200
1201 subreq = cli_writeall_send(substate,
1202 state->ev, state->cli,
1203 state->fnum, state->mode,
1204 substate->buf,
1205 substate->ofs,
1206 substate->size);
1207 if (!subreq) {
1208 talloc_free(substate);
1209 return false;
1210 }
1211 tevent_req_set_callback(subreq, cli_push_written, substate);
1212
1213 state->reqs[idx] = substate;
1214 state->pending += 1;
1215 state->next_offset += substate->size;
1216
1217 return true;
1218 }
1219
1220 struct tevent_req *cli_push_send(TALLOC_CTX *mem_ctx, struct event_context *ev,
1221 struct cli_state *cli,
1222 uint16_t fnum, uint16_t mode,
1223 off_t start_offset, size_t window_size,
1224 size_t (*source)(uint8_t *buf, size_t n,
1225 void *priv),
1226 void *priv)
1227 {
1228 struct tevent_req *req;
1229 struct cli_push_state *state;
1230 uint32_t i;
1231
1232 req = tevent_req_create(mem_ctx, &state, struct cli_push_state);
1233 if (req == NULL) {
1234 return NULL;
1235 }
1236 state->cli = cli;
1237 state->ev = ev;
1238 state->fnum = fnum;
1239 state->start_offset = start_offset;
1240 state->mode = mode;
1241 state->source = source;
1242 state->priv = priv;
1243 state->eof = false;
1244 state->pending = 0;
1245 state->next_offset = start_offset;
1246
1247 state->chunk_size = cli_write_max_bufsize(cli, mode);
1248
1249 if (window_size == 0) {
1250 window_size = cli->max_mux * state->chunk_size;
1251 }
1252 state->num_reqs = window_size/state->chunk_size;
1253 if ((window_size % state->chunk_size) > 0) {
1254 state->num_reqs += 1;
1255 }
1256 state->num_reqs = MIN(state->num_reqs, cli->max_mux);
1257 state->num_reqs = MAX(state->num_reqs, 1);
1258
1259 state->reqs = TALLOC_ZERO_ARRAY(state, struct cli_push_write_state *,
1260 state->num_reqs);
1261 if (state->reqs == NULL) {
1262 goto failed;
1263 }
1264
1265 for (i=0; i<state->num_reqs; i++) {
1266 if (!cli_push_write_setup(req, state, i)) {
1267 goto failed;
1268 }
1269
1270 if (state->eof) {
1271 break;
1272 }
1273 }
1274
1275 if (state->pending == 0) {
1276 tevent_req_done(req);
1277 return tevent_req_post(req, ev);
1278 }
1279
1280 return req;
1281
1282 failed:
1283 tevent_req_nterror(req, NT_STATUS_NO_MEMORY);
1284 return tevent_req_post(req, ev);
1285 }
1286
1287 static void cli_push_written(struct tevent_req *subreq)
1288 {
1289 struct cli_push_write_state *substate = tevent_req_callback_data(
1290 subreq, struct cli_push_write_state);
1291 struct tevent_req *req = substate->req;
1292 struct cli_push_state *state = tevent_req_data(
1293 req, struct cli_push_state);
1294 NTSTATUS status;
1295 uint32_t idx = substate->idx;
1296
1297 state->reqs[idx] = NULL;
1298 state->pending -= 1;
1299
1300 status = cli_writeall_recv(subreq);
1301 TALLOC_FREE(subreq);
1302 TALLOC_FREE(substate);
1303 if (!NT_STATUS_IS_OK(status)) {
1304 tevent_req_nterror(req, status);
1305 return;
1306 }
1307
1308 if (!state->eof) {
1309 if (!cli_push_write_setup(req, state, idx)) {
1310 tevent_req_nterror(req, NT_STATUS_NO_MEMORY);
1311 return;
1312 }
1313 }
1314
1315 if (state->pending == 0) {
1316 tevent_req_done(req);
1317 return;
1318 }
1319 }
1320
1321 NTSTATUS cli_push_recv(struct tevent_req *req)
1322 {
1323 return tevent_req_simple_recv_ntstatus(req);
1324 }
1325
1326 NTSTATUS cli_push(struct cli_state *cli, uint16_t fnum, uint16_t mode,
1327 off_t start_offset, size_t window_size,
1328 size_t (*source)(uint8_t *buf, size_t n, void *priv),
1329 void *priv)
1330 {
1331 TALLOC_CTX *frame = talloc_stackframe();
1332 struct event_context *ev;
1333 struct tevent_req *req;
1334 NTSTATUS status = NT_STATUS_OK;
1335
1336 if (cli_has_async_calls(cli)) {
1337 /*
1338 * Can't use sync call while an async call is in flight
1339 */
1340 status = NT_STATUS_INVALID_PARAMETER;
1341 goto fail;
1342 }
1343
1344 ev = event_context_init(frame);
1345 if (ev == NULL) {
1346 status = NT_STATUS_NO_MEMORY;
1347 goto fail;
1348 }
1349
1350 req = cli_push_send(frame, ev, cli, fnum, mode, start_offset,
1351 window_size, source, priv);
1352 if (req == NULL) {
1353 status = NT_STATUS_NO_MEMORY;
1354 goto fail;
1355 }
1356
1357 if (!tevent_req_poll(req, ev)) {
1358 status = map_nt_error_from_unix(errno);
1359 goto fail;
1360 }
1361
1362 status = cli_push_recv(req);
1363 fail:
1364 TALLOC_FREE(frame);
1365 if (!NT_STATUS_IS_OK(status)) {
1366 cli_set_error(cli, status);
1367 }
1368 return status;
1369 }
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