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s3: Replace shadow_copy2 with a new implementation
[Samba.git] / source3 / libsmb / clireadwrite.c
blob14b6401051e63624120f4c065755f29c02a951bd
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
26 /****************************************************************************
27 Calculate the recommended read buffer size
28 ****************************************************************************/
29 static size_t cli_read_max_bufsize(struct cli_state *cli)
30 {
31 size_t data_offset = smb_size - 4;
32 size_t wct = 12;
33
34 size_t useable_space;
35
36 if (!client_is_signing_on(cli) && !cli_encryption_on(cli)
37 && (cli->server_posix_capabilities & CIFS_UNIX_LARGE_READ_CAP)) {
38 return CLI_SAMBA_MAX_POSIX_LARGE_READX_SIZE;
39 }
40 if (cli->capabilities & CAP_LARGE_READX) {
41 return cli->is_samba
42 ? CLI_SAMBA_MAX_LARGE_READX_SIZE
43 : CLI_WINDOWS_MAX_LARGE_READX_SIZE;
44 }
45
46 data_offset += wct * sizeof(uint16_t);
47 data_offset += 1; /* pad */
48
49 useable_space = cli->max_xmit - data_offset;
50
51 return useable_space;
52 }
53
54 /****************************************************************************
55 Calculate the recommended write buffer size
56 ****************************************************************************/
57 static size_t cli_write_max_bufsize(struct cli_state *cli,
58 uint16_t write_mode,
59 uint8_t wct)
60 {
61 if (write_mode == 0 &&
62 !client_is_signing_on(cli) &&
63 !cli_encryption_on(cli) &&
64 (cli->server_posix_capabilities & CIFS_UNIX_LARGE_WRITE_CAP) &&
65 (cli->capabilities & CAP_LARGE_FILES)) {
66 /* Only do massive writes if we can do them direct
67 * with no signing or encrypting - not on a pipe. */
68 return CLI_SAMBA_MAX_POSIX_LARGE_WRITEX_SIZE;
69 }
70
71 if (cli->is_samba) {
72 return CLI_SAMBA_MAX_LARGE_WRITEX_SIZE;
73 }
74
75 if (((cli->capabilities & CAP_LARGE_WRITEX) == 0)
76 || client_is_signing_on(cli)
77 || strequal(cli->dev, "LPT1:")) {
78 size_t data_offset = smb_size - 4;
79 size_t useable_space;
80
81 data_offset += wct * sizeof(uint16_t);
82 data_offset += 1; /* pad */
83
84 useable_space = cli->max_xmit - data_offset;
85
86 return useable_space;
87 }
88
89 return CLI_WINDOWS_MAX_LARGE_WRITEX_SIZE;
90 }
91
92 struct cli_read_andx_state {
93 size_t size;
94 uint16_t vwv[12];
95 NTSTATUS status;
96 size_t received;
97 uint8_t *buf;
98 };
99
100 static void cli_read_andx_done(struct tevent_req *subreq);
101
102 struct tevent_req *cli_read_andx_create(TALLOC_CTX *mem_ctx,
103 struct event_context *ev,
104 struct cli_state *cli, uint16_t fnum,
105 off_t offset, size_t size,
106 struct tevent_req **psmbreq)
107 {
108 struct tevent_req *req, *subreq;
109 struct cli_read_andx_state *state;
110 uint8_t wct = 10;
111
112 if (size > cli_read_max_bufsize(cli)) {
113 DEBUG(0, ("cli_read_andx_send got size=%d, can only handle "
114 "size=%d\n", (int)size,
115 (int)cli_read_max_bufsize(cli)));
116 return NULL;
117 }
118
119 req = tevent_req_create(mem_ctx, &state, struct cli_read_andx_state);
120 if (req == NULL) {
121 return NULL;
122 }
123 state->size = size;
124
125 SCVAL(state->vwv + 0, 0, 0xFF);
126 SCVAL(state->vwv + 0, 1, 0);
127 SSVAL(state->vwv + 1, 0, 0);
128 SSVAL(state->vwv + 2, 0, fnum);
129 SIVAL(state->vwv + 3, 0, offset);
130 SSVAL(state->vwv + 5, 0, size);
131 SSVAL(state->vwv + 6, 0, size);
132 SSVAL(state->vwv + 7, 0, (size >> 16));
133 SSVAL(state->vwv + 8, 0, 0);
134 SSVAL(state->vwv + 9, 0, 0);
135
136 if ((uint64_t)offset >> 32) {
137 SIVAL(state->vwv + 10, 0,
138 (((uint64_t)offset)>>32) & 0xffffffff);
139 wct += 2;
140 }
141
142 subreq = cli_smb_req_create(state, ev, cli, SMBreadX, 0, wct,
143 state->vwv, 0, NULL);
144 if (subreq == NULL) {
145 TALLOC_FREE(req);
146 return NULL;
147 }
148 tevent_req_set_callback(subreq, cli_read_andx_done, req);
149 *psmbreq = subreq;
150 return req;
151 }
152
153 struct tevent_req *cli_read_andx_send(TALLOC_CTX *mem_ctx,
154 struct event_context *ev,
155 struct cli_state *cli, uint16_t fnum,
156 off_t offset, size_t size)
157 {
158 struct tevent_req *req, *subreq;
159 NTSTATUS status;
160
161 req = cli_read_andx_create(mem_ctx, ev, cli, fnum, offset, size,
162 &subreq);
163 if (req == NULL) {
164 return NULL;
165 }
166
167 status = cli_smb_req_send(subreq);
168 if (tevent_req_nterror(req, status)) {
169 return tevent_req_post(req, ev);
170 }
171 return req;
172 }
173
174 static void cli_read_andx_done(struct tevent_req *subreq)
175 {
176 struct tevent_req *req = tevent_req_callback_data(
177 subreq, struct tevent_req);
178 struct cli_read_andx_state *state = tevent_req_data(
179 req, struct cli_read_andx_state);
180 uint8_t *inbuf;
181 uint8_t wct;
182 uint16_t *vwv;
183 uint32_t num_bytes;
184 uint8_t *bytes;
185
186 state->status = cli_smb_recv(subreq, state, &inbuf, 12, &wct, &vwv,
187 &num_bytes, &bytes);
188 TALLOC_FREE(subreq);
189 if (NT_STATUS_IS_ERR(state->status)) {
190 tevent_req_nterror(req, state->status);
191 return;
192 }
193
194 /* size is the number of bytes the server returned.
195 * Might be zero. */
196 state->received = SVAL(vwv + 5, 0);
197 state->received |= (((unsigned int)SVAL(vwv + 7, 0)) << 16);
198
199 if (state->received > state->size) {
200 DEBUG(5,("server returned more than we wanted!\n"));
201 tevent_req_nterror(req, NT_STATUS_UNEXPECTED_IO_ERROR);
202 return;
203 }
204
205 /*
206 * bcc field must be valid for small reads, for large reads the 16-bit
207 * bcc field can't be correct.
208 */
209
210 if ((state->received < 0xffff) && (state->received > num_bytes)) {
211 DEBUG(5, ("server announced more bytes than sent\n"));
212 tevent_req_nterror(req, NT_STATUS_INVALID_NETWORK_RESPONSE);
213 return;
214 }
215
216 state->buf = discard_const_p(uint8_t, smb_base(inbuf)) + SVAL(vwv+6, 0);
217
218 if (trans_oob(smb_len(inbuf), SVAL(vwv+6, 0), state->received)
219 || ((state->received != 0) && (state->buf < bytes))) {
220 DEBUG(5, ("server returned invalid read&x data offset\n"));
221 tevent_req_nterror(req, NT_STATUS_INVALID_NETWORK_RESPONSE);
222 return;
223 }
224 tevent_req_done(req);
225 }
226
227 /*
228 * Pull the data out of a finished async read_and_x request. rcvbuf is
229 * talloced from the request, so better make sure that you copy it away before
230 * you talloc_free(req). "rcvbuf" is NOT a talloc_ctx of its own, so do not
231 * talloc_move it!
232 */
233
234 NTSTATUS cli_read_andx_recv(struct tevent_req *req, ssize_t *received,
235 uint8_t **rcvbuf)
236 {
237 struct cli_read_andx_state *state = tevent_req_data(
238 req, struct cli_read_andx_state);
239 NTSTATUS status;
240
241 if (tevent_req_is_nterror(req, &status)) {
242 return status;
243 }
244 *received = state->received;
245 *rcvbuf = state->buf;
246 return NT_STATUS_OK;
247 }
248
249 struct cli_readall_state {
250 struct tevent_context *ev;
251 struct cli_state *cli;
252 uint16_t fnum;
253 off_t start_offset;
254 size_t size;
255 size_t received;
256 uint8_t *buf;
257 };
258
259 static void cli_readall_done(struct tevent_req *subreq);
260
261 static struct tevent_req *cli_readall_send(TALLOC_CTX *mem_ctx,
262 struct event_context *ev,
263 struct cli_state *cli,
264 uint16_t fnum,
265 off_t offset, size_t size)
266 {
267 struct tevent_req *req, *subreq;
268 struct cli_readall_state *state;
269
270 req = tevent_req_create(mem_ctx, &state, struct cli_readall_state);
271 if (req == NULL) {
272 return NULL;
273 }
274 state->ev = ev;
275 state->cli = cli;
276 state->fnum = fnum;
277 state->start_offset = offset;
278 state->size = size;
279 state->received = 0;
280 state->buf = NULL;
281
282 subreq = cli_read_andx_send(state, ev, cli, fnum, offset, size);
283 if (tevent_req_nomem(subreq, req)) {
284 return tevent_req_post(req, ev);
285 }
286 tevent_req_set_callback(subreq, cli_readall_done, req);
287 return req;
288 }
289
290 static void cli_readall_done(struct tevent_req *subreq)
291 {
292 struct tevent_req *req = tevent_req_callback_data(
293 subreq, struct tevent_req);
294 struct cli_readall_state *state = tevent_req_data(
295 req, struct cli_readall_state);
296 ssize_t received;
297 uint8_t *buf;
298 NTSTATUS status;
299
300 status = cli_read_andx_recv(subreq, &received, &buf);
301 if (tevent_req_nterror(req, status)) {
302 return;
303 }
304
305 if (received == 0) {
306 /* EOF */
307 tevent_req_done(req);
308 return;
309 }
310
311 if ((state->received == 0) && (received == state->size)) {
312 /* Ideal case: Got it all in one run */
313 state->buf = buf;
314 state->received += received;
315 tevent_req_done(req);
316 return;
317 }
318
319 /*
320 * We got a short read, issue a read for the
321 * rest. Unfortunately we have to allocate the buffer
322 * ourselves now, as our caller expects to receive a single
323 * buffer. cli_read_andx does it from the buffer received from
324 * the net, but with a short read we have to put it together
325 * from several reads.
326 */
327
328 if (state->buf == NULL) {
329 state->buf = talloc_array(state, uint8_t, state->size);
330 if (tevent_req_nomem(state->buf, req)) {
331 return;
332 }
333 }
334 memcpy(state->buf + state->received, buf, received);
335 state->received += received;
336
337 TALLOC_FREE(subreq);
338
339 if (state->received >= state->size) {
340 tevent_req_done(req);
341 return;
342 }
343
344 subreq = cli_read_andx_send(state, state->ev, state->cli, state->fnum,
345 state->start_offset + state->received,
346 state->size - state->received);
347 if (tevent_req_nomem(subreq, req)) {
348 return;
349 }
350 tevent_req_set_callback(subreq, cli_readall_done, req);
351 }
352
353 static NTSTATUS cli_readall_recv(struct tevent_req *req, ssize_t *received,
354 uint8_t **rcvbuf)
355 {
356 struct cli_readall_state *state = tevent_req_data(
357 req, struct cli_readall_state);
358 NTSTATUS status;
359
360 if (tevent_req_is_nterror(req, &status)) {
361 return status;
362 }
363 *received = state->received;
364 *rcvbuf = state->buf;
365 return NT_STATUS_OK;
366 }
367
368 struct cli_pull_subreq {
369 struct tevent_req *req;
370 ssize_t received;
371 uint8_t *buf;
372 };
373
374 /*
375 * Parallel read support.
376 *
377 * cli_pull sends as many read&x requests as the server would allow via
378 * max_mux at a time. When replies flow back in, the data is written into
379 * the callback function "sink" in the right order.
380 */
381
382 struct cli_pull_state {
383 struct tevent_req *req;
384
385 struct event_context *ev;
386 struct cli_state *cli;
387 uint16_t fnum;
388 off_t start_offset;
389 SMB_OFF_T size;
390
391 NTSTATUS (*sink)(char *buf, size_t n, void *priv);
392 void *priv;
393
394 size_t chunk_size;
395
396 /*
397 * Outstanding requests
398 */
399 int num_reqs;
400 struct cli_pull_subreq *reqs;
401
402 /*
403 * For how many bytes did we send requests already?
404 */
405 SMB_OFF_T requested;
406
407 /*
408 * Next request index to push into "sink". This walks around the "req"
409 * array, taking care that the requests are pushed to "sink" in the
410 * right order. If necessary (i.e. replies don't come in in the right
411 * order), replies are held back in "reqs".
412 */
413 int top_req;
414
415 /*
416 * How many bytes did we push into "sink"?
417 */
418
419 SMB_OFF_T pushed;
420 };
421
422 static char *cli_pull_print(struct tevent_req *req, TALLOC_CTX *mem_ctx)
423 {
424 struct cli_pull_state *state = tevent_req_data(
425 req, struct cli_pull_state);
426 char *result;
427
428 result = tevent_req_default_print(req, mem_ctx);
429 if (result == NULL) {
430 return NULL;
431 }
432
433 return talloc_asprintf_append_buffer(
434 result, "num_reqs=%d, top_req=%d",
435 state->num_reqs, state->top_req);
436 }
437
438 static void cli_pull_read_done(struct tevent_req *read_req);
439
440 /*
441 * Prepare an async pull request
442 */
443
444 struct tevent_req *cli_pull_send(TALLOC_CTX *mem_ctx,
445 struct event_context *ev,
446 struct cli_state *cli,
447 uint16_t fnum, off_t start_offset,
448 SMB_OFF_T size, size_t window_size,
449 NTSTATUS (*sink)(char *buf, size_t n,
450 void *priv),
451 void *priv)
452 {
453 struct tevent_req *req;
454 struct cli_pull_state *state;
455 int i;
456
457 req = tevent_req_create(mem_ctx, &state, struct cli_pull_state);
458 if (req == NULL) {
459 return NULL;
460 }
461 tevent_req_set_print_fn(req, cli_pull_print);
462 state->req = req;
463
464 state->cli = cli;
465 state->ev = ev;
466 state->fnum = fnum;
467 state->start_offset = start_offset;
468 state->size = size;
469 state->sink = sink;
470 state->priv = priv;
471
472 state->pushed = 0;
473 state->top_req = 0;
474
475 if (size == 0) {
476 tevent_req_done(req);
477 return tevent_req_post(req, ev);
478 }
479
480 state->chunk_size = cli_read_max_bufsize(cli);
481
482 state->num_reqs = MAX(window_size/state->chunk_size, 1);
483 state->num_reqs = MIN(state->num_reqs, cli->max_mux);
484
485 state->reqs = talloc_zero_array(state, struct cli_pull_subreq,
486 state->num_reqs);
487 if (state->reqs == NULL) {
488 goto failed;
489 }
490
491 state->requested = 0;
492
493 for (i=0; i<state->num_reqs; i++) {
494 struct cli_pull_subreq *subreq = &state->reqs[i];
495 SMB_OFF_T size_left;
496 size_t request_thistime;
497
498 if (state->requested >= size) {
499 state->num_reqs = i;
500 break;
501 }
502
503 size_left = size - state->requested;
504 request_thistime = MIN(size_left, state->chunk_size);
505
506 subreq->req = cli_readall_send(
507 state->reqs, ev, cli, fnum,
508 state->start_offset + state->requested,
509 request_thistime);
510
511 if (subreq->req == NULL) {
512 goto failed;
513 }
514 tevent_req_set_callback(subreq->req, cli_pull_read_done, req);
515 state->requested += request_thistime;
516 }
517 return req;
518
519 failed:
520 TALLOC_FREE(req);
521 return NULL;
522 }
523
524 /*
525 * Handle incoming read replies, push the data into sink and send out new
526 * requests if necessary.
527 */
528
529 static void cli_pull_read_done(struct tevent_req *subreq)
530 {
531 struct tevent_req *req = tevent_req_callback_data(
532 subreq, struct tevent_req);
533 struct cli_pull_state *state = tevent_req_data(
534 req, struct cli_pull_state);
535 struct cli_pull_subreq *pull_subreq = NULL;
536 NTSTATUS status;
537 int i;
538
539 for (i = 0; i < state->num_reqs; i++) {
540 pull_subreq = &state->reqs[i];
541 if (subreq == pull_subreq->req) {
542 break;
543 }
544 }
545 if (i == state->num_reqs) {
546 /* Huh -- received something we did not send?? */
547 tevent_req_nterror(req, NT_STATUS_INTERNAL_ERROR);
548 return;
549 }
550
551 status = cli_readall_recv(subreq, &pull_subreq->received,
552 &pull_subreq->buf);
553 if (!NT_STATUS_IS_OK(status)) {
554 tevent_req_nterror(state->req, status);
555 return;
556 }
557
558 /*
559 * This loop is the one to take care of out-of-order replies. All
560 * pending requests are in state->reqs, state->reqs[top_req] is the
561 * one that is to be pushed next. If however a request later than
562 * top_req is replied to, then we can't push yet. If top_req is
563 * replied to at a later point then, we need to push all the finished
564 * requests.
565 */
566
567 while (state->reqs[state->top_req].req != NULL) {
568 struct cli_pull_subreq *top_subreq;
569
570 DEBUG(11, ("cli_pull_read_done: top_req = %d\n",
571 state->top_req));
572
573 top_subreq = &state->reqs[state->top_req];
574
575 if (tevent_req_is_in_progress(top_subreq->req)) {
576 DEBUG(11, ("cli_pull_read_done: top request not yet "
577 "done\n"));
578 return;
579 }
580
581 DEBUG(10, ("cli_pull_read_done: Pushing %d bytes, %d already "
582 "pushed\n", (int)top_subreq->received,
583 (int)state->pushed));
584
585 status = state->sink((char *)top_subreq->buf,
586 top_subreq->received, state->priv);
587 if (tevent_req_nterror(state->req, status)) {
588 return;
589 }
590 state->pushed += top_subreq->received;
591
592 TALLOC_FREE(state->reqs[state->top_req].req);
593
594 if (state->requested < state->size) {
595 struct tevent_req *new_req;
596 SMB_OFF_T size_left;
597 size_t request_thistime;
598
599 size_left = state->size - state->requested;
600 request_thistime = MIN(size_left, state->chunk_size);
601
602 DEBUG(10, ("cli_pull_read_done: Requesting %d bytes "
603 "at %d, position %d\n",
604 (int)request_thistime,
605 (int)(state->start_offset
606 + state->requested),
607 state->top_req));
608
609 new_req = cli_readall_send(
610 state->reqs, state->ev, state->cli,
611 state->fnum,
612 state->start_offset + state->requested,
613 request_thistime);
614
615 if (tevent_req_nomem(new_req, state->req)) {
616 return;
617 }
618 tevent_req_set_callback(new_req, cli_pull_read_done,
619 req);
620
621 state->reqs[state->top_req].req = new_req;
622 state->requested += request_thistime;
623 }
624
625 state->top_req = (state->top_req+1) % state->num_reqs;
626 }
627
628 tevent_req_done(req);
629 }
630
631 NTSTATUS cli_pull_recv(struct tevent_req *req, SMB_OFF_T *received)
632 {
633 struct cli_pull_state *state = tevent_req_data(
634 req, struct cli_pull_state);
635 NTSTATUS status;
636
637 if (tevent_req_is_nterror(req, &status)) {
638 return status;
639 }
640 *received = state->pushed;
641 return NT_STATUS_OK;
642 }
643
644 NTSTATUS cli_pull(struct cli_state *cli, uint16_t fnum,
645 off_t start_offset, SMB_OFF_T size, size_t window_size,
646 NTSTATUS (*sink)(char *buf, size_t n, void *priv),
647 void *priv, SMB_OFF_T *received)
648 {
649 TALLOC_CTX *frame = talloc_stackframe();
650 struct event_context *ev;
651 struct tevent_req *req;
652 NTSTATUS status = NT_STATUS_OK;
653
654 if (cli_has_async_calls(cli)) {
655 /*
656 * Can't use sync call while an async call is in flight
657 */
658 status = NT_STATUS_INVALID_PARAMETER;
659 goto fail;
660 }
661
662 ev = event_context_init(frame);
663 if (ev == NULL) {
664 status = NT_STATUS_NO_MEMORY;
665 goto fail;
666 }
667
668 req = cli_pull_send(frame, ev, cli, fnum, start_offset, size,
669 window_size, sink, priv);
670 if (req == NULL) {
671 status = NT_STATUS_NO_MEMORY;
672 goto fail;
673 }
674
675 if (!tevent_req_poll(req, ev)) {
676 status = map_nt_error_from_unix(errno);
677 goto fail;
678 }
679
680 status = cli_pull_recv(req, received);
681 fail:
682 TALLOC_FREE(frame);
683 return status;
684 }
685
686 static NTSTATUS cli_read_sink(char *buf, size_t n, void *priv)
687 {
688 char **pbuf = (char **)priv;
689 memcpy(*pbuf, buf, n);
690 *pbuf += n;
691 return NT_STATUS_OK;
692 }
693
694 ssize_t cli_read(struct cli_state *cli, uint16_t fnum, char *buf,
695 off_t offset, size_t size)
696 {
697 NTSTATUS status;
698 SMB_OFF_T ret;
699
700 status = cli_pull(cli, fnum, offset, size, size,
701 cli_read_sink, &buf, &ret);
702 if (!NT_STATUS_IS_OK(status)) {
703 return -1;
704 }
705 return ret;
706 }
707
708 /****************************************************************************
709 write to a file using a SMBwrite and not bypassing 0 byte writes
710 ****************************************************************************/
711
712 NTSTATUS cli_smbwrite(struct cli_state *cli, uint16_t fnum, char *buf,
713 off_t offset, size_t size1, size_t *ptotal)
714 {
715 uint8_t *bytes;
716 ssize_t total = 0;
717
718 /*
719 * 3 bytes prefix
720 */
721
722 bytes = talloc_array(talloc_tos(), uint8_t, 3);
723 if (bytes == NULL) {
724 return NT_STATUS_NO_MEMORY;
725 }
726 bytes[0] = 1;
727
728 do {
729 size_t size = MIN(size1, cli->max_xmit - 48);
730 struct tevent_req *req;
731 uint16_t vwv[5];
732 uint16_t *ret_vwv;
733 NTSTATUS status;
734
735 SSVAL(vwv+0, 0, fnum);
736 SSVAL(vwv+1, 0, size);
737 SIVAL(vwv+2, 0, offset);
738 SSVAL(vwv+4, 0, 0);
739
740 bytes = talloc_realloc(talloc_tos(), bytes, uint8_t,
741 size+3);
742 if (bytes == NULL) {
743 return NT_STATUS_NO_MEMORY;
744 }
745 SSVAL(bytes, 1, size);
746 memcpy(bytes + 3, buf + total, size);
747
748 status = cli_smb(talloc_tos(), cli, SMBwrite, 0, 5, vwv,
749 size+3, bytes, &req, 1, NULL, &ret_vwv,
750 NULL, NULL);
751 if (!NT_STATUS_IS_OK(status)) {
752 TALLOC_FREE(bytes);
753 return status;
754 }
755
756 size = SVAL(ret_vwv+0, 0);
757 TALLOC_FREE(req);
758 if (size == 0) {
759 break;
760 }
761 size1 -= size;
762 total += size;
763 offset += size;
764
765 } while (size1);
766
767 TALLOC_FREE(bytes);
768
769 if (ptotal != NULL) {
770 *ptotal = total;
771 }
772 return NT_STATUS_OK;
773 }
774
775 /*
776 * Send a write&x request
777 */
778
779 struct cli_write_andx_state {
780 size_t size;
781 uint16_t vwv[14];
782 size_t written;
783 uint8_t pad;
784 struct iovec iov[2];
785 };
786
787 static void cli_write_andx_done(struct tevent_req *subreq);
788
789 struct tevent_req *cli_write_andx_create(TALLOC_CTX *mem_ctx,
790 struct event_context *ev,
791 struct cli_state *cli, uint16_t fnum,
792 uint16_t mode, const uint8_t *buf,
793 off_t offset, size_t size,
794 struct tevent_req **reqs_before,
795 int num_reqs_before,
796 struct tevent_req **psmbreq)
797 {
798 struct tevent_req *req, *subreq;
799 struct cli_write_andx_state *state;
800 bool bigoffset = ((cli->capabilities & CAP_LARGE_FILES) != 0);
801 uint8_t wct = bigoffset ? 14 : 12;
802 size_t max_write = cli_write_max_bufsize(cli, mode, wct);
803 uint16_t *vwv;
804
805 req = tevent_req_create(mem_ctx, &state, struct cli_write_andx_state);
806 if (req == NULL) {
807 return NULL;
808 }
809
810 size = MIN(size, max_write);
811
812 vwv = state->vwv;
813
814 SCVAL(vwv+0, 0, 0xFF);
815 SCVAL(vwv+0, 1, 0);
816 SSVAL(vwv+1, 0, 0);
817 SSVAL(vwv+2, 0, fnum);
818 SIVAL(vwv+3, 0, offset);
819 SIVAL(vwv+5, 0, 0);
820 SSVAL(vwv+7, 0, mode);
821 SSVAL(vwv+8, 0, 0);
822 SSVAL(vwv+9, 0, (size>>16));
823 SSVAL(vwv+10, 0, size);
824
825 SSVAL(vwv+11, 0,
826 cli_smb_wct_ofs(reqs_before, num_reqs_before)
827 + 1 /* the wct field */
828 + wct * 2 /* vwv */
829 + 2 /* num_bytes field */
830 + 1 /* pad */);
831
832 if (bigoffset) {
833 SIVAL(vwv+12, 0, (((uint64_t)offset)>>32) & 0xffffffff);
834 }
835
836 state->pad = 0;
837 state->iov[0].iov_base = (void *)&state->pad;
838 state->iov[0].iov_len = 1;
839 state->iov[1].iov_base = discard_const_p(void, buf);
840 state->iov[1].iov_len = size;
841
842 subreq = cli_smb_req_create(state, ev, cli, SMBwriteX, 0, wct, vwv,
843 2, state->iov);
844 if (tevent_req_nomem(subreq, req)) {
845 return tevent_req_post(req, ev);
846 }
847 tevent_req_set_callback(subreq, cli_write_andx_done, req);
848 *psmbreq = subreq;
849 return req;
850 }
851
852 struct tevent_req *cli_write_andx_send(TALLOC_CTX *mem_ctx,
853 struct event_context *ev,
854 struct cli_state *cli, uint16_t fnum,
855 uint16_t mode, const uint8_t *buf,
856 off_t offset, size_t size)
857 {
858 struct tevent_req *req, *subreq;
859 NTSTATUS status;
860
861 req = cli_write_andx_create(mem_ctx, ev, cli, fnum, mode, buf, offset,
862 size, NULL, 0, &subreq);
863 if (req == NULL) {
864 return NULL;
865 }
866
867 status = cli_smb_req_send(subreq);
868 if (tevent_req_nterror(req, status)) {
869 return tevent_req_post(req, ev);
870 }
871 return req;
872 }
873
874 static void cli_write_andx_done(struct tevent_req *subreq)
875 {
876 struct tevent_req *req = tevent_req_callback_data(
877 subreq, struct tevent_req);
878 struct cli_write_andx_state *state = tevent_req_data(
879 req, struct cli_write_andx_state);
880 uint8_t wct;
881 uint16_t *vwv;
882 uint8_t *inbuf;
883 NTSTATUS status;
884
885 status = cli_smb_recv(subreq, state, &inbuf, 6, &wct, &vwv,
886 NULL, NULL);
887 TALLOC_FREE(subreq);
888 if (NT_STATUS_IS_ERR(status)) {
889 tevent_req_nterror(req, status);
890 return;
891 }
892 state->written = SVAL(vwv+2, 0);
893 state->written |= SVAL(vwv+4, 0)<<16;
894 tevent_req_done(req);
895 }
896
897 NTSTATUS cli_write_andx_recv(struct tevent_req *req, size_t *pwritten)
898 {
899 struct cli_write_andx_state *state = tevent_req_data(
900 req, struct cli_write_andx_state);
901 NTSTATUS status;
902
903 if (tevent_req_is_nterror(req, &status)) {
904 return status;
905 }
906 *pwritten = state->written;
907 return NT_STATUS_OK;
908 }
909
910 struct cli_writeall_state {
911 struct event_context *ev;
912 struct cli_state *cli;
913 uint16_t fnum;
914 uint16_t mode;
915 const uint8_t *buf;
916 off_t offset;
917 size_t size;
918 size_t written;
919 };
920
921 static void cli_writeall_written(struct tevent_req *req);
922
923 static struct tevent_req *cli_writeall_send(TALLOC_CTX *mem_ctx,
924 struct event_context *ev,
925 struct cli_state *cli,
926 uint16_t fnum,
927 uint16_t mode,
928 const uint8_t *buf,
929 off_t offset, size_t size)
930 {
931 struct tevent_req *req, *subreq;
932 struct cli_writeall_state *state;
933
934 req = tevent_req_create(mem_ctx, &state, struct cli_writeall_state);
935 if (req == NULL) {
936 return NULL;
937 }
938 state->ev = ev;
939 state->cli = cli;
940 state->fnum = fnum;
941 state->mode = mode;
942 state->buf = buf;
943 state->offset = offset;
944 state->size = size;
945 state->written = 0;
946
947 subreq = cli_write_andx_send(state, state->ev, state->cli, state->fnum,
948 state->mode, state->buf, state->offset,
949 state->size);
950 if (tevent_req_nomem(subreq, req)) {
951 return tevent_req_post(req, ev);
952 }
953 tevent_req_set_callback(subreq, cli_writeall_written, req);
954 return req;
955 }
956
957 static void cli_writeall_written(struct tevent_req *subreq)
958 {
959 struct tevent_req *req = tevent_req_callback_data(
960 subreq, struct tevent_req);
961 struct cli_writeall_state *state = tevent_req_data(
962 req, struct cli_writeall_state);
963 NTSTATUS status;
964 size_t written, to_write;
965
966 status = cli_write_andx_recv(subreq, &written);
967 TALLOC_FREE(subreq);
968 if (tevent_req_nterror(req, status)) {
969 return;
970 }
971
972 state->written += written;
973
974 if (state->written > state->size) {
975 tevent_req_nterror(req, NT_STATUS_INVALID_NETWORK_RESPONSE);
976 return;
977 }
978
979 to_write = state->size - state->written;
980
981 if (to_write == 0) {
982 tevent_req_done(req);
983 return;
984 }
985
986 subreq = cli_write_andx_send(state, state->ev, state->cli, state->fnum,
987 state->mode,
988 state->buf + state->written,
989 state->offset + state->written, to_write);
990 if (tevent_req_nomem(subreq, req)) {
991 return;
992 }
993 tevent_req_set_callback(subreq, cli_writeall_written, req);
994 }
995
996 static NTSTATUS cli_writeall_recv(struct tevent_req *req,
997 size_t *pwritten)
998 {
999 struct cli_writeall_state *state = tevent_req_data(
1000 req, struct cli_writeall_state);
1001 NTSTATUS status;
1002
1003 if (tevent_req_is_nterror(req, &status)) {
1004 return status;
1005 }
1006 if (pwritten != NULL) {
1007 *pwritten = state->written;
1008 }
1009 return NT_STATUS_OK;
1010 }
1011
1012 NTSTATUS cli_writeall(struct cli_state *cli, uint16_t fnum, uint16_t mode,
1013 const uint8_t *buf, off_t offset, size_t size,
1014 size_t *pwritten)
1015 {
1016 TALLOC_CTX *frame = talloc_stackframe();
1017 struct event_context *ev;
1018 struct tevent_req *req;
1019 NTSTATUS status = NT_STATUS_NO_MEMORY;
1020
1021 if (cli_has_async_calls(cli)) {
1022 /*
1023 * Can't use sync call while an async call is in flight
1024 */
1025 status = NT_STATUS_INVALID_PARAMETER;
1026 goto fail;
1027 }
1028 ev = event_context_init(frame);
1029 if (ev == NULL) {
1030 goto fail;
1031 }
1032 req = cli_writeall_send(frame, ev, cli, fnum, mode, buf, offset, size);
1033 if (req == NULL) {
1034 goto fail;
1035 }
1036 if (!tevent_req_poll(req, ev)) {
1037 status = map_nt_error_from_unix(errno);
1038 goto fail;
1039 }
1040 status = cli_writeall_recv(req, pwritten);
1041 fail:
1042 TALLOC_FREE(frame);
1043 return status;
1044 }
1045
1046 struct cli_push_write_state {
1047 struct tevent_req *req;/* This is the main request! Not the subreq */
1048 uint32_t idx;
1049 off_t ofs;
1050 uint8_t *buf;
1051 size_t size;
1052 };
1053
1054 struct cli_push_state {
1055 struct event_context *ev;
1056 struct cli_state *cli;
1057 uint16_t fnum;
1058 uint16_t mode;
1059 off_t start_offset;
1060 size_t window_size;
1061
1062 size_t (*source)(uint8_t *buf, size_t n, void *priv);
1063 void *priv;
1064
1065 bool eof;
1066
1067 size_t chunk_size;
1068 off_t next_offset;
1069
1070 /*
1071 * Outstanding requests
1072 */
1073 uint32_t pending;
1074 uint32_t num_reqs;
1075 struct cli_push_write_state **reqs;
1076 };
1077
1078 static void cli_push_written(struct tevent_req *req);
1079
1080 static bool cli_push_write_setup(struct tevent_req *req,
1081 struct cli_push_state *state,
1082 uint32_t idx)
1083 {
1084 struct cli_push_write_state *substate;
1085 struct tevent_req *subreq;
1086
1087 substate = talloc(state->reqs, struct cli_push_write_state);
1088 if (!substate) {
1089 return false;
1090 }
1091 substate->req = req;
1092 substate->idx = idx;
1093 substate->ofs = state->next_offset;
1094 substate->buf = talloc_array(substate, uint8_t, state->chunk_size);
1095 if (!substate->buf) {
1096 talloc_free(substate);
1097 return false;
1098 }
1099 substate->size = state->source(substate->buf,
1100 state->chunk_size,
1101 state->priv);
1102 if (substate->size == 0) {
1103 state->eof = true;
1104 /* nothing to send */
1105 talloc_free(substate);
1106 return true;
1107 }
1108
1109 subreq = cli_writeall_send(substate,
1110 state->ev, state->cli,
1111 state->fnum, state->mode,
1112 substate->buf,
1113 substate->ofs,
1114 substate->size);
1115 if (!subreq) {
1116 talloc_free(substate);
1117 return false;
1118 }
1119 tevent_req_set_callback(subreq, cli_push_written, substate);
1120
1121 state->reqs[idx] = substate;
1122 state->pending += 1;
1123 state->next_offset += substate->size;
1124
1125 return true;
1126 }
1127
1128 struct tevent_req *cli_push_send(TALLOC_CTX *mem_ctx, struct event_context *ev,
1129 struct cli_state *cli,
1130 uint16_t fnum, uint16_t mode,
1131 off_t start_offset, size_t window_size,
1132 size_t (*source)(uint8_t *buf, size_t n,
1133 void *priv),
1134 void *priv)
1135 {
1136 struct tevent_req *req;
1137 struct cli_push_state *state;
1138 uint32_t i;
1139
1140 req = tevent_req_create(mem_ctx, &state, struct cli_push_state);
1141 if (req == NULL) {
1142 return NULL;
1143 }
1144 state->cli = cli;
1145 state->ev = ev;
1146 state->fnum = fnum;
1147 state->start_offset = start_offset;
1148 state->mode = mode;
1149 state->source = source;
1150 state->priv = priv;
1151 state->eof = false;
1152 state->pending = 0;
1153 state->next_offset = start_offset;
1154
1155 state->chunk_size = cli_write_max_bufsize(cli, mode, 14);
1156
1157 if (window_size == 0) {
1158 window_size = cli->max_mux * state->chunk_size;
1159 }
1160 state->num_reqs = window_size/state->chunk_size;
1161 if ((window_size % state->chunk_size) > 0) {
1162 state->num_reqs += 1;
1163 }
1164 state->num_reqs = MIN(state->num_reqs, cli->max_mux);
1165 state->num_reqs = MAX(state->num_reqs, 1);
1166
1167 state->reqs = talloc_zero_array(state, struct cli_push_write_state *,
1168 state->num_reqs);
1169 if (state->reqs == NULL) {
1170 goto failed;
1171 }
1172
1173 for (i=0; i<state->num_reqs; i++) {
1174 if (!cli_push_write_setup(req, state, i)) {
1175 goto failed;
1176 }
1177
1178 if (state->eof) {
1179 break;
1180 }
1181 }
1182
1183 if (state->pending == 0) {
1184 tevent_req_done(req);
1185 return tevent_req_post(req, ev);
1186 }
1187
1188 return req;
1189
1190 failed:
1191 tevent_req_nterror(req, NT_STATUS_NO_MEMORY);
1192 return tevent_req_post(req, ev);
1193 }
1194
1195 static void cli_push_written(struct tevent_req *subreq)
1196 {
1197 struct cli_push_write_state *substate = tevent_req_callback_data(
1198 subreq, struct cli_push_write_state);
1199 struct tevent_req *req = substate->req;
1200 struct cli_push_state *state = tevent_req_data(
1201 req, struct cli_push_state);
1202 NTSTATUS status;
1203 uint32_t idx = substate->idx;
1204
1205 state->reqs[idx] = NULL;
1206 state->pending -= 1;
1207
1208 status = cli_writeall_recv(subreq, NULL);
1209 TALLOC_FREE(subreq);
1210 TALLOC_FREE(substate);
1211 if (tevent_req_nterror(req, status)) {
1212 return;
1213 }
1214
1215 if (!state->eof) {
1216 if (!cli_push_write_setup(req, state, idx)) {
1217 tevent_req_nterror(req, NT_STATUS_NO_MEMORY);
1218 return;
1219 }
1220 }
1221
1222 if (state->pending == 0) {
1223 tevent_req_done(req);
1224 return;
1225 }
1226 }
1227
1228 NTSTATUS cli_push_recv(struct tevent_req *req)
1229 {
1230 return tevent_req_simple_recv_ntstatus(req);
1231 }
1232
1233 NTSTATUS cli_push(struct cli_state *cli, uint16_t fnum, uint16_t mode,
1234 off_t start_offset, size_t window_size,
1235 size_t (*source)(uint8_t *buf, size_t n, void *priv),
1236 void *priv)
1237 {
1238 TALLOC_CTX *frame = talloc_stackframe();
1239 struct event_context *ev;
1240 struct tevent_req *req;
1241 NTSTATUS status = NT_STATUS_OK;
1242
1243 if (cli_has_async_calls(cli)) {
1244 /*
1245 * Can't use sync call while an async call is in flight
1246 */
1247 status = NT_STATUS_INVALID_PARAMETER;
1248 goto fail;
1249 }
1250
1251 ev = event_context_init(frame);
1252 if (ev == NULL) {
1253 status = NT_STATUS_NO_MEMORY;
1254 goto fail;
1255 }
1256
1257 req = cli_push_send(frame, ev, cli, fnum, mode, start_offset,
1258 window_size, source, priv);
1259 if (req == NULL) {
1260 status = NT_STATUS_NO_MEMORY;
1261 goto fail;
1262 }
1263
1264 if (!tevent_req_poll(req, ev)) {
1265 status = map_nt_error_from_unix(errno);
1266 goto fail;
1267 }
1268
1269 status = cli_push_recv(req);
1270 fail:
1271 TALLOC_FREE(frame);
1272 return status;
1273 }
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