?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
s3: Add cli_writeall
[Samba.git] / source3 / libsmb / clireadwrite.c
blob6482a335e1b9ce579252a67f6fa70e814d5ab370
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 "async_smb.h"
22 #include "trans2.h"
23
24 /****************************************************************************
25 Calculate the recommended read buffer size
26 ****************************************************************************/
27 static size_t cli_read_max_bufsize(struct cli_state *cli)
28 {
29 if (!client_is_signing_on(cli) && !cli_encryption_on(cli)
30 && (cli->server_posix_capabilities & CIFS_UNIX_LARGE_READ_CAP)) {
31 return CLI_SAMBA_MAX_POSIX_LARGE_READX_SIZE;
32 }
33 if (cli->capabilities & CAP_LARGE_READX) {
34 return cli->is_samba
35 ? CLI_SAMBA_MAX_LARGE_READX_SIZE
36 : CLI_WINDOWS_MAX_LARGE_READX_SIZE;
37 }
38 return (cli->max_xmit - (smb_size+32)) & ~1023;
39 }
40
41 /****************************************************************************
42 Calculate the recommended write buffer size
43 ****************************************************************************/
44 static size_t cli_write_max_bufsize(struct cli_state *cli, uint16_t write_mode)
45 {
46 if (write_mode == 0 &&
47 !client_is_signing_on(cli) &&
48 !cli_encryption_on(cli) &&
49 (cli->server_posix_capabilities & CIFS_UNIX_LARGE_WRITE_CAP) &&
50 (cli->capabilities & CAP_LARGE_FILES)) {
51 /* Only do massive writes if we can do them direct
52 * with no signing or encrypting - not on a pipe. */
53 return CLI_SAMBA_MAX_POSIX_LARGE_WRITEX_SIZE;
54 }
55
56 if (cli->is_samba) {
57 return CLI_SAMBA_MAX_LARGE_WRITEX_SIZE;
58 }
59
60 if (((cli->capabilities & CAP_LARGE_WRITEX) == 0)
61 || client_is_signing_on(cli)
62 || strequal(cli->dev, "LPT1:")) {
63
64 /*
65 * Printer devices are restricted to max_xmit writesize in
66 * Vista and XPSP3 as are signing connections.
67 */
68
69 return (cli->max_xmit - (smb_size+32)) & ~1023;
70 }
71
72 return CLI_WINDOWS_MAX_LARGE_WRITEX_SIZE;
73 }
74
75 struct cli_read_andx_state {
76 size_t size;
77 uint16_t vwv[12];
78 NTSTATUS status;
79 size_t received;
80 uint8_t *buf;
81 };
82
83 static void cli_read_andx_done(struct tevent_req *subreq);
84
85 struct tevent_req *cli_read_andx_create(TALLOC_CTX *mem_ctx,
86 struct event_context *ev,
87 struct cli_state *cli, uint16_t fnum,
88 off_t offset, size_t size,
89 struct tevent_req **psmbreq)
90 {
91 struct tevent_req *req, *subreq;
92 struct cli_read_andx_state *state;
93 uint8_t wct = 10;
94
95 if (size > cli_read_max_bufsize(cli)) {
96 DEBUG(0, ("cli_read_andx_send got size=%d, can only handle "
97 "size=%d\n", (int)size,
98 (int)cli_read_max_bufsize(cli)));
99 return NULL;
100 }
101
102 req = tevent_req_create(mem_ctx, &state, struct cli_read_andx_state);
103 if (req == NULL) {
104 return NULL;
105 }
106 state->size = size;
107
108 SCVAL(state->vwv + 0, 0, 0xFF);
109 SCVAL(state->vwv + 0, 1, 0);
110 SSVAL(state->vwv + 1, 0, 0);
111 SSVAL(state->vwv + 2, 0, fnum);
112 SIVAL(state->vwv + 3, 0, offset);
113 SSVAL(state->vwv + 5, 0, size);
114 SSVAL(state->vwv + 6, 0, size);
115 SSVAL(state->vwv + 7, 0, (size >> 16));
116 SSVAL(state->vwv + 8, 0, 0);
117 SSVAL(state->vwv + 9, 0, 0);
118
119 if ((uint64_t)offset >> 32) {
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 (tevent_req_nterror(req, status)) {
152 return tevent_req_post(req, ev);
153 }
154 return req;
155 }
156
157 static void cli_read_andx_done(struct tevent_req *subreq)
158 {
159 struct tevent_req *req = tevent_req_callback_data(
160 subreq, struct tevent_req);
161 struct cli_read_andx_state *state = tevent_req_data(
162 req, struct cli_read_andx_state);
163 uint8_t *inbuf;
164 uint8_t wct;
165 uint16_t *vwv;
166 uint32_t num_bytes;
167 uint8_t *bytes;
168
169 state->status = cli_smb_recv(subreq, state, &inbuf, 12, &wct, &vwv,
170 &num_bytes, &bytes);
171 TALLOC_FREE(subreq);
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 state->buf = (uint8_t *)smb_base(inbuf) + SVAL(vwv+6, 0);
200
201 if (trans_oob(smb_len(inbuf), SVAL(vwv+6, 0), state->received)
202 || ((state->received != 0) && (state->buf < bytes))) {
203 DEBUG(5, ("server returned invalid read&x data offset\n"));
204 tevent_req_nterror(req, NT_STATUS_INVALID_NETWORK_RESPONSE);
205 return;
206 }
207 tevent_req_done(req);
208 }
209
210 /*
211 * Pull the data out of a finished async read_and_x request. rcvbuf is
212 * talloced from the request, so better make sure that you copy it away before
213 * you talloc_free(req). "rcvbuf" is NOT a talloc_ctx of its own, so do not
214 * talloc_move it!
215 */
216
217 NTSTATUS cli_read_andx_recv(struct tevent_req *req, ssize_t *received,
218 uint8_t **rcvbuf)
219 {
220 struct cli_read_andx_state *state = tevent_req_data(
221 req, struct cli_read_andx_state);
222 NTSTATUS status;
223
224 if (tevent_req_is_nterror(req, &status)) {
225 return status;
226 }
227 *received = state->received;
228 *rcvbuf = state->buf;
229 return NT_STATUS_OK;
230 }
231
232 struct cli_readall_state {
233 struct tevent_context *ev;
234 struct cli_state *cli;
235 uint16_t fnum;
236 off_t start_offset;
237 size_t size;
238 size_t received;
239 uint8_t *buf;
240 };
241
242 static void cli_readall_done(struct tevent_req *subreq);
243
244 static struct tevent_req *cli_readall_send(TALLOC_CTX *mem_ctx,
245 struct event_context *ev,
246 struct cli_state *cli,
247 uint16_t fnum,
248 off_t offset, size_t size)
249 {
250 struct tevent_req *req, *subreq;
251 struct cli_readall_state *state;
252
253 req = tevent_req_create(mem_ctx, &state, struct cli_readall_state);
254 if (req == NULL) {
255 return NULL;
256 }
257 state->ev = ev;
258 state->cli = cli;
259 state->fnum = fnum;
260 state->start_offset = offset;
261 state->size = size;
262 state->received = 0;
263 state->buf = NULL;
264
265 subreq = cli_read_andx_send(state, ev, cli, fnum, offset, size);
266 if (tevent_req_nomem(subreq, req)) {
267 return tevent_req_post(req, ev);
268 }
269 tevent_req_set_callback(subreq, cli_readall_done, req);
270 return req;
271 }
272
273 static void cli_readall_done(struct tevent_req *subreq)
274 {
275 struct tevent_req *req = tevent_req_callback_data(
276 subreq, struct tevent_req);
277 struct cli_readall_state *state = tevent_req_data(
278 req, struct cli_readall_state);
279 ssize_t received;
280 uint8_t *buf;
281 NTSTATUS status;
282
283 status = cli_read_andx_recv(subreq, &received, &buf);
284 if (tevent_req_nterror(req, status)) {
285 return;
286 }
287
288 if (received == 0) {
289 /* EOF */
290 tevent_req_done(req);
291 return;
292 }
293
294 if ((state->received == 0) && (received == state->size)) {
295 /* Ideal case: Got it all in one run */
296 state->buf = buf;
297 state->received += received;
298 tevent_req_done(req);
299 return;
300 }
301
302 /*
303 * We got a short read, issue a read for the
304 * rest. Unfortunately we have to allocate the buffer
305 * ourselves now, as our caller expects to receive a single
306 * buffer. cli_read_andx does it from the buffer received from
307 * the net, but with a short read we have to put it together
308 * from several reads.
309 */
310
311 if (state->buf == NULL) {
312 state->buf = talloc_array(state, uint8_t, state->size);
313 if (tevent_req_nomem(state->buf, req)) {
314 return;
315 }
316 }
317 memcpy(state->buf + state->received, buf, received);
318 state->received += received;
319
320 TALLOC_FREE(subreq);
321
322 if (state->received >= state->size) {
323 tevent_req_done(req);
324 return;
325 }
326
327 subreq = cli_read_andx_send(state, state->ev, state->cli, state->fnum,
328 state->start_offset + state->received,
329 state->size - state->received);
330 if (tevent_req_nomem(subreq, req)) {
331 return;
332 }
333 tevent_req_set_callback(subreq, cli_readall_done, req);
334 }
335
336 static NTSTATUS cli_readall_recv(struct tevent_req *req, ssize_t *received,
337 uint8_t **rcvbuf)
338 {
339 struct cli_readall_state *state = tevent_req_data(
340 req, struct cli_readall_state);
341 NTSTATUS status;
342
343 if (tevent_req_is_nterror(req, &status)) {
344 return status;
345 }
346 *received = state->received;
347 *rcvbuf = state->buf;
348 return NT_STATUS_OK;
349 }
350
351 struct cli_pull_subreq {
352 struct tevent_req *req;
353 ssize_t received;
354 uint8_t *buf;
355 };
356
357 /*
358 * Parallel read support.
359 *
360 * cli_pull sends as many read&x requests as the server would allow via
361 * max_mux at a time. When replies flow back in, the data is written into
362 * the callback function "sink" in the right order.
363 */
364
365 struct cli_pull_state {
366 struct tevent_req *req;
367
368 struct event_context *ev;
369 struct cli_state *cli;
370 uint16_t fnum;
371 off_t start_offset;
372 SMB_OFF_T size;
373
374 NTSTATUS (*sink)(char *buf, size_t n, void *priv);
375 void *priv;
376
377 size_t chunk_size;
378
379 /*
380 * Outstanding requests
381 */
382 int num_reqs;
383 struct cli_pull_subreq *reqs;
384
385 /*
386 * For how many bytes did we send requests already?
387 */
388 SMB_OFF_T requested;
389
390 /*
391 * Next request index to push into "sink". This walks around the "req"
392 * array, taking care that the requests are pushed to "sink" in the
393 * right order. If necessary (i.e. replies don't come in in the right
394 * order), replies are held back in "reqs".
395 */
396 int top_req;
397
398 /*
399 * How many bytes did we push into "sink"?
400 */
401
402 SMB_OFF_T pushed;
403 };
404
405 static char *cli_pull_print(struct tevent_req *req, TALLOC_CTX *mem_ctx)
406 {
407 struct cli_pull_state *state = tevent_req_data(
408 req, struct cli_pull_state);
409 char *result;
410
411 result = tevent_req_default_print(req, mem_ctx);
412 if (result == NULL) {
413 return NULL;
414 }
415
416 return talloc_asprintf_append_buffer(
417 result, "num_reqs=%d, top_req=%d",
418 state->num_reqs, state->top_req);
419 }
420
421 static void cli_pull_read_done(struct tevent_req *read_req);
422
423 /*
424 * Prepare an async pull request
425 */
426
427 struct tevent_req *cli_pull_send(TALLOC_CTX *mem_ctx,
428 struct event_context *ev,
429 struct cli_state *cli,
430 uint16_t fnum, off_t start_offset,
431 SMB_OFF_T size, size_t window_size,
432 NTSTATUS (*sink)(char *buf, size_t n,
433 void *priv),
434 void *priv)
435 {
436 struct tevent_req *req;
437 struct cli_pull_state *state;
438 int i;
439
440 req = tevent_req_create(mem_ctx, &state, struct cli_pull_state);
441 if (req == NULL) {
442 return NULL;
443 }
444 tevent_req_set_print_fn(req, cli_pull_print);
445 state->req = req;
446
447 state->cli = cli;
448 state->ev = ev;
449 state->fnum = fnum;
450 state->start_offset = start_offset;
451 state->size = size;
452 state->sink = sink;
453 state->priv = priv;
454
455 state->pushed = 0;
456 state->top_req = 0;
457
458 if (size == 0) {
459 tevent_req_done(req);
460 return tevent_req_post(req, ev);
461 }
462
463 state->chunk_size = cli_read_max_bufsize(cli);
464
465 state->num_reqs = MAX(window_size/state->chunk_size, 1);
466 state->num_reqs = MIN(state->num_reqs, cli->max_mux);
467
468 state->reqs = TALLOC_ZERO_ARRAY(state, struct cli_pull_subreq,
469 state->num_reqs);
470 if (state->reqs == NULL) {
471 goto failed;
472 }
473
474 state->requested = 0;
475
476 for (i=0; i<state->num_reqs; i++) {
477 struct cli_pull_subreq *subreq = &state->reqs[i];
478 SMB_OFF_T size_left;
479 size_t request_thistime;
480
481 if (state->requested >= size) {
482 state->num_reqs = i;
483 break;
484 }
485
486 size_left = size - state->requested;
487 request_thistime = MIN(size_left, state->chunk_size);
488
489 subreq->req = cli_readall_send(
490 state->reqs, ev, cli, fnum,
491 state->start_offset + state->requested,
492 request_thistime);
493
494 if (subreq->req == NULL) {
495 goto failed;
496 }
497 tevent_req_set_callback(subreq->req, cli_pull_read_done, req);
498 state->requested += request_thistime;
499 }
500 return req;
501
502 failed:
503 TALLOC_FREE(req);
504 return NULL;
505 }
506
507 /*
508 * Handle incoming read replies, push the data into sink and send out new
509 * requests if necessary.
510 */
511
512 static void cli_pull_read_done(struct tevent_req *subreq)
513 {
514 struct tevent_req *req = tevent_req_callback_data(
515 subreq, struct tevent_req);
516 struct cli_pull_state *state = tevent_req_data(
517 req, struct cli_pull_state);
518 struct cli_pull_subreq *pull_subreq = NULL;
519 NTSTATUS status;
520 int i;
521
522 for (i = 0; i < state->num_reqs; i++) {
523 pull_subreq = &state->reqs[i];
524 if (subreq == pull_subreq->req) {
525 break;
526 }
527 }
528 if (i == state->num_reqs) {
529 /* Huh -- received something we did not send?? */
530 tevent_req_nterror(req, NT_STATUS_INTERNAL_ERROR);
531 return;
532 }
533
534 status = cli_readall_recv(subreq, &pull_subreq->received,
535 &pull_subreq->buf);
536 if (!NT_STATUS_IS_OK(status)) {
537 tevent_req_nterror(state->req, status);
538 return;
539 }
540
541 /*
542 * This loop is the one to take care of out-of-order replies. All
543 * pending requests are in state->reqs, state->reqs[top_req] is the
544 * one that is to be pushed next. If however a request later than
545 * top_req is replied to, then we can't push yet. If top_req is
546 * replied to at a later point then, we need to push all the finished
547 * requests.
548 */
549
550 while (state->reqs[state->top_req].req != NULL) {
551 struct cli_pull_subreq *top_subreq;
552
553 DEBUG(11, ("cli_pull_read_done: top_req = %d\n",
554 state->top_req));
555
556 top_subreq = &state->reqs[state->top_req];
557
558 if (tevent_req_is_in_progress(top_subreq->req)) {
559 DEBUG(11, ("cli_pull_read_done: top request not yet "
560 "done\n"));
561 return;
562 }
563
564 DEBUG(10, ("cli_pull_read_done: Pushing %d bytes, %d already "
565 "pushed\n", (int)top_subreq->received,
566 (int)state->pushed));
567
568 status = state->sink((char *)top_subreq->buf,
569 top_subreq->received, state->priv);
570 if (tevent_req_nterror(state->req, status)) {
571 return;
572 }
573 state->pushed += top_subreq->received;
574
575 TALLOC_FREE(state->reqs[state->top_req].req);
576
577 if (state->requested < state->size) {
578 struct tevent_req *new_req;
579 SMB_OFF_T size_left;
580 size_t request_thistime;
581
582 size_left = state->size - state->requested;
583 request_thistime = MIN(size_left, state->chunk_size);
584
585 DEBUG(10, ("cli_pull_read_done: Requesting %d bytes "
586 "at %d, position %d\n",
587 (int)request_thistime,
588 (int)(state->start_offset
589 + state->requested),
590 state->top_req));
591
592 new_req = cli_readall_send(
593 state->reqs, state->ev, state->cli,
594 state->fnum,
595 state->start_offset + state->requested,
596 request_thistime);
597
598 if (tevent_req_nomem(new_req, state->req)) {
599 return;
600 }
601 tevent_req_set_callback(new_req, cli_pull_read_done,
602 req);
603
604 state->reqs[state->top_req].req = new_req;
605 state->requested += request_thistime;
606 }
607
608 state->top_req = (state->top_req+1) % state->num_reqs;
609 }
610
611 tevent_req_done(req);
612 }
613
614 NTSTATUS cli_pull_recv(struct tevent_req *req, SMB_OFF_T *received)
615 {
616 struct cli_pull_state *state = tevent_req_data(
617 req, struct cli_pull_state);
618 NTSTATUS status;
619
620 if (tevent_req_is_nterror(req, &status)) {
621 return status;
622 }
623 *received = state->pushed;
624 return NT_STATUS_OK;
625 }
626
627 NTSTATUS cli_pull(struct cli_state *cli, uint16_t fnum,
628 off_t start_offset, SMB_OFF_T size, size_t window_size,
629 NTSTATUS (*sink)(char *buf, size_t n, void *priv),
630 void *priv, SMB_OFF_T *received)
631 {
632 TALLOC_CTX *frame = talloc_stackframe();
633 struct event_context *ev;
634 struct tevent_req *req;
635 NTSTATUS status = NT_STATUS_OK;
636
637 if (cli_has_async_calls(cli)) {
638 /*
639 * Can't use sync call while an async call is in flight
640 */
641 status = NT_STATUS_INVALID_PARAMETER;
642 goto fail;
643 }
644
645 ev = event_context_init(frame);
646 if (ev == NULL) {
647 status = NT_STATUS_NO_MEMORY;
648 goto fail;
649 }
650
651 req = cli_pull_send(frame, ev, cli, fnum, start_offset, size,
652 window_size, sink, priv);
653 if (req == NULL) {
654 status = NT_STATUS_NO_MEMORY;
655 goto fail;
656 }
657
658 if (!tevent_req_poll(req, ev)) {
659 status = map_nt_error_from_unix(errno);
660 goto fail;
661 }
662
663 status = cli_pull_recv(req, received);
664 fail:
665 TALLOC_FREE(frame);
666 if (!NT_STATUS_IS_OK(status)) {
667 cli_set_error(cli, status);
668 }
669 return status;
670 }
671
672 static NTSTATUS cli_read_sink(char *buf, size_t n, void *priv)
673 {
674 char **pbuf = (char **)priv;
675 memcpy(*pbuf, buf, n);
676 *pbuf += n;
677 return NT_STATUS_OK;
678 }
679
680 ssize_t cli_read(struct cli_state *cli, uint16_t fnum, char *buf,
681 off_t offset, size_t size)
682 {
683 NTSTATUS status;
684 SMB_OFF_T ret;
685
686 status = cli_pull(cli, fnum, offset, size, size,
687 cli_read_sink, &buf, &ret);
688 if (!NT_STATUS_IS_OK(status)) {
689 cli_set_error(cli, status);
690 return -1;
691 }
692 return ret;
693 }
694
695 /****************************************************************************
696 Issue a single SMBwrite and don't wait for a reply.
697 ****************************************************************************/
698
699 static bool cli_issue_write(struct cli_state *cli,
700 uint16_t fnum,
701 off_t offset,
702 uint16 mode,
703 const char *buf,
704 size_t size)
705 {
706 char *p;
707 bool large_writex = false;
708 /* We can only do direct writes if not signing and not encrypting. */
709 bool direct_writes = !client_is_signing_on(cli) && !cli_encryption_on(cli);
710
711 if (!direct_writes && size + 1 > cli->bufsize) {
712 cli->outbuf = (char *)SMB_REALLOC(cli->outbuf, size + 1024);
713 if (!cli->outbuf) {
714 return False;
715 }
716 cli->inbuf = (char *)SMB_REALLOC(cli->inbuf, size + 1024);
717 if (cli->inbuf == NULL) {
718 SAFE_FREE(cli->outbuf);
719 return False;
720 }
721 cli->bufsize = size + 1024;
722 }
723
724 memset(cli->outbuf,'\0',smb_size);
725 memset(cli->inbuf,'\0',smb_size);
726
727 if (cli->capabilities & CAP_LARGE_FILES) {
728 large_writex = True;
729 }
730
731 if (large_writex) {
732 cli_set_message(cli->outbuf,14,0,True);
733 } else {
734 cli_set_message(cli->outbuf,12,0,True);
735 }
736
737 SCVAL(cli->outbuf,smb_com,SMBwriteX);
738 SSVAL(cli->outbuf,smb_tid,cli->cnum);
739 cli_setup_packet(cli);
740
741 SCVAL(cli->outbuf,smb_vwv0,0xFF);
742 SSVAL(cli->outbuf,smb_vwv2,fnum);
743
744 SIVAL(cli->outbuf,smb_vwv3,offset);
745 SIVAL(cli->outbuf,smb_vwv5,0);
746 SSVAL(cli->outbuf,smb_vwv7,mode);
747
748 SSVAL(cli->outbuf,smb_vwv8,(mode & 0x0008) ? size : 0);
749 /*
750 * According to CIFS-TR-1p00, this following field should only
751 * be set if CAP_LARGE_WRITEX is set. We should check this
752 * locally. However, this check might already have been
753 * done by our callers.
754 */
755 SSVAL(cli->outbuf,smb_vwv9,(size>>16));
756 SSVAL(cli->outbuf,smb_vwv10,size);
757 /* +1 is pad byte. */
758 SSVAL(cli->outbuf,smb_vwv11,
759 smb_buf(cli->outbuf) - smb_base(cli->outbuf) + 1);
760
761 if (large_writex) {
762 SIVAL(cli->outbuf,smb_vwv12,(((uint64_t)offset)>>32) & 0xffffffff);
763 }
764
765 p = smb_base(cli->outbuf) + SVAL(cli->outbuf,smb_vwv11) -1;
766 *p++ = '\0'; /* pad byte. */
767 if (!direct_writes) {
768 memcpy(p, buf, size);
769 }
770 if (size > 0x1FFFF) {
771 /* This is a POSIX 14 word large write. */
772 set_message_bcc(cli->outbuf, 0); /* Set bcc to zero. */
773 _smb_setlen_large(cli->outbuf,smb_size + 28 + 1 /* pad */ + size - 4);
774 } else {
775 cli_setup_bcc(cli, p+size);
776 }
777
778 show_msg(cli->outbuf);
779 if (direct_writes) {
780 /* For direct writes we now need to write the data
781 * directly out of buf. */
782 return cli_send_smb_direct_writeX(cli, buf, size);
783 } else {
784 return cli_send_smb(cli);
785 }
786 }
787
788 /****************************************************************************
789 write to a file
790 write_mode: 0x0001 disallow write cacheing
791 0x0002 return bytes remaining
792 0x0004 use raw named pipe protocol
793 0x0008 start of message mode named pipe protocol
794 ****************************************************************************/
795
796 ssize_t cli_write(struct cli_state *cli,
797 uint16_t fnum, uint16 write_mode,
798 const char *buf, off_t offset, size_t size)
799 {
800 ssize_t bwritten = 0;
801 unsigned int issued = 0;
802 unsigned int received = 0;
803 int mpx = 1;
804 size_t writesize;
805 int blocks;
806
807 if(cli->max_mux > 1) {
808 mpx = cli->max_mux-1;
809 } else {
810 mpx = 1;
811 }
812
813 writesize = cli_write_max_bufsize(cli, write_mode);
814
815 blocks = (size + (writesize-1)) / writesize;
816
817 while (received < blocks) {
818
819 while ((issued - received < mpx) && (issued < blocks)) {
820 ssize_t bsent = issued * writesize;
821 ssize_t size1 = MIN(writesize, size - bsent);
822
823 if (!cli_issue_write(cli, fnum, offset + bsent,
824 write_mode,
825 buf + bsent,
826 size1))
827 return -1;
828 issued++;
829 }
830
831 if (!cli_receive_smb(cli)) {
832 return bwritten;
833 }
834
835 received++;
836
837 if (cli_is_error(cli))
838 break;
839
840 bwritten += SVAL(cli->inbuf, smb_vwv2);
841 if (writesize > 0xFFFF) {
842 bwritten += (((int)(SVAL(cli->inbuf, smb_vwv4)))<<16);
843 }
844 }
845
846 while (received < issued && cli_receive_smb(cli)) {
847 received++;
848 }
849
850 return bwritten;
851 }
852
853 /****************************************************************************
854 write to a file using a SMBwrite and not bypassing 0 byte writes
855 ****************************************************************************/
856
857 NTSTATUS cli_smbwrite(struct cli_state *cli, uint16_t fnum, char *buf,
858 off_t offset, size_t size1, size_t *ptotal)
859 {
860 uint8_t *bytes;
861 ssize_t total = 0;
862
863 /*
864 * 3 bytes prefix
865 */
866
867 bytes = TALLOC_ARRAY(talloc_tos(), uint8_t, 3);
868 if (bytes == NULL) {
869 return NT_STATUS_NO_MEMORY;
870 }
871 bytes[0] = 1;
872
873 do {
874 size_t size = MIN(size1, cli->max_xmit - 48);
875 struct tevent_req *req;
876 uint16_t vwv[5];
877 uint16_t *ret_vwv;
878 NTSTATUS status;
879
880 SSVAL(vwv+0, 0, fnum);
881 SSVAL(vwv+1, 0, size);
882 SIVAL(vwv+2, 0, offset);
883 SSVAL(vwv+4, 0, 0);
884
885 bytes = TALLOC_REALLOC_ARRAY(talloc_tos(), bytes, uint8_t,
886 size+3);
887 if (bytes == NULL) {
888 return NT_STATUS_NO_MEMORY;
889 }
890 SSVAL(bytes, 1, size);
891 memcpy(bytes + 3, buf + total, size);
892
893 status = cli_smb(talloc_tos(), cli, SMBwrite, 0, 5, vwv,
894 size+3, bytes, &req, 1, NULL, &ret_vwv,
895 NULL, NULL);
896 if (!NT_STATUS_IS_OK(status)) {
897 TALLOC_FREE(bytes);
898 return status;
899 }
900
901 size = SVAL(ret_vwv+0, 0);
902 TALLOC_FREE(req);
903 if (size == 0) {
904 break;
905 }
906 size1 -= size;
907 total += size;
908 offset += size;
909
910 } while (size1);
911
912 TALLOC_FREE(bytes);
913
914 if (ptotal != NULL) {
915 *ptotal = total;
916 }
917 return NT_STATUS_OK;
918 }
919
920 /*
921 * Send a write&x request
922 */
923
924 struct cli_write_andx_state {
925 size_t size;
926 uint16_t vwv[14];
927 size_t written;
928 uint8_t pad;
929 struct iovec iov[2];
930 };
931
932 static void cli_write_andx_done(struct tevent_req *subreq);
933
934 struct tevent_req *cli_write_andx_create(TALLOC_CTX *mem_ctx,
935 struct event_context *ev,
936 struct cli_state *cli, uint16_t fnum,
937 uint16_t mode, const uint8_t *buf,
938 off_t offset, size_t size,
939 struct tevent_req **reqs_before,
940 int num_reqs_before,
941 struct tevent_req **psmbreq)
942 {
943 struct tevent_req *req, *subreq;
944 struct cli_write_andx_state *state;
945 bool bigoffset = ((cli->capabilities & CAP_LARGE_FILES) != 0);
946 uint8_t wct = bigoffset ? 14 : 12;
947 size_t max_write = cli_write_max_bufsize(cli, mode);
948 uint16_t *vwv;
949
950 req = tevent_req_create(mem_ctx, &state, struct cli_write_andx_state);
951 if (req == NULL) {
952 return NULL;
953 }
954
955 size = MIN(size, max_write);
956
957 vwv = state->vwv;
958
959 SCVAL(vwv+0, 0, 0xFF);
960 SCVAL(vwv+0, 1, 0);
961 SSVAL(vwv+1, 0, 0);
962 SSVAL(vwv+2, 0, fnum);
963 SIVAL(vwv+3, 0, offset);
964 SIVAL(vwv+5, 0, 0);
965 SSVAL(vwv+7, 0, mode);
966 SSVAL(vwv+8, 0, 0);
967 SSVAL(vwv+9, 0, (size>>16));
968 SSVAL(vwv+10, 0, size);
969
970 SSVAL(vwv+11, 0,
971 cli_smb_wct_ofs(reqs_before, num_reqs_before)
972 + 1 /* the wct field */
973 + wct * 2 /* vwv */
974 + 2 /* num_bytes field */
975 + 1 /* pad */);
976
977 if (bigoffset) {
978 SIVAL(vwv+12, 0, (((uint64_t)offset)>>32) & 0xffffffff);
979 }
980
981 state->pad = 0;
982 state->iov[0].iov_base = (void *)&state->pad;
983 state->iov[0].iov_len = 1;
984 state->iov[1].iov_base = CONST_DISCARD(void *, buf);
985 state->iov[1].iov_len = size;
986
987 subreq = cli_smb_req_create(state, ev, cli, SMBwriteX, 0, wct, vwv,
988 2, state->iov);
989 if (tevent_req_nomem(subreq, req)) {
990 return tevent_req_post(req, ev);
991 }
992 tevent_req_set_callback(subreq, cli_write_andx_done, req);
993 *psmbreq = subreq;
994 return req;
995 }
996
997 struct tevent_req *cli_write_andx_send(TALLOC_CTX *mem_ctx,
998 struct event_context *ev,
999 struct cli_state *cli, uint16_t fnum,
1000 uint16_t mode, const uint8_t *buf,
1001 off_t offset, size_t size)
1002 {
1003 struct tevent_req *req, *subreq;
1004 NTSTATUS status;
1005
1006 req = cli_write_andx_create(mem_ctx, ev, cli, fnum, mode, buf, offset,
1007 size, NULL, 0, &subreq);
1008 if (req == NULL) {
1009 return NULL;
1010 }
1011
1012 status = cli_smb_req_send(subreq);
1013 if (tevent_req_nterror(req, status)) {
1014 return tevent_req_post(req, ev);
1015 }
1016 return req;
1017 }
1018
1019 static void cli_write_andx_done(struct tevent_req *subreq)
1020 {
1021 struct tevent_req *req = tevent_req_callback_data(
1022 subreq, struct tevent_req);
1023 struct cli_write_andx_state *state = tevent_req_data(
1024 req, struct cli_write_andx_state);
1025 uint8_t wct;
1026 uint16_t *vwv;
1027 uint8_t *inbuf;
1028 NTSTATUS status;
1029
1030 status = cli_smb_recv(subreq, state, &inbuf, 6, &wct, &vwv,
1031 NULL, NULL);
1032 TALLOC_FREE(subreq);
1033 if (NT_STATUS_IS_ERR(status)) {
1034 tevent_req_nterror(req, status);
1035 return;
1036 }
1037 state->written = SVAL(vwv+2, 0);
1038 state->written |= SVAL(vwv+4, 0)<<16;
1039 tevent_req_done(req);
1040 }
1041
1042 NTSTATUS cli_write_andx_recv(struct tevent_req *req, size_t *pwritten)
1043 {
1044 struct cli_write_andx_state *state = tevent_req_data(
1045 req, struct cli_write_andx_state);
1046 NTSTATUS status;
1047
1048 if (tevent_req_is_nterror(req, &status)) {
1049 return status;
1050 }
1051 *pwritten = state->written;
1052 return NT_STATUS_OK;
1053 }
1054
1055 struct cli_writeall_state {
1056 struct event_context *ev;
1057 struct cli_state *cli;
1058 uint16_t fnum;
1059 uint16_t mode;
1060 const uint8_t *buf;
1061 off_t offset;
1062 size_t size;
1063 size_t written;
1064 };
1065
1066 static void cli_writeall_written(struct tevent_req *req);
1067
1068 static struct tevent_req *cli_writeall_send(TALLOC_CTX *mem_ctx,
1069 struct event_context *ev,
1070 struct cli_state *cli,
1071 uint16_t fnum,
1072 uint16_t mode,
1073 const uint8_t *buf,
1074 off_t offset, size_t size)
1075 {
1076 struct tevent_req *req, *subreq;
1077 struct cli_writeall_state *state;
1078
1079 req = tevent_req_create(mem_ctx, &state, struct cli_writeall_state);
1080 if (req == NULL) {
1081 return NULL;
1082 }
1083 state->ev = ev;
1084 state->cli = cli;
1085 state->fnum = fnum;
1086 state->mode = mode;
1087 state->buf = buf;
1088 state->offset = offset;
1089 state->size = size;
1090 state->written = 0;
1091
1092 subreq = cli_write_andx_send(state, state->ev, state->cli, state->fnum,
1093 state->mode, state->buf, state->offset,
1094 state->size);
1095 if (tevent_req_nomem(subreq, req)) {
1096 return tevent_req_post(req, ev);
1097 }
1098 tevent_req_set_callback(subreq, cli_writeall_written, req);
1099 return req;
1100 }
1101
1102 static void cli_writeall_written(struct tevent_req *subreq)
1103 {
1104 struct tevent_req *req = tevent_req_callback_data(
1105 subreq, struct tevent_req);
1106 struct cli_writeall_state *state = tevent_req_data(
1107 req, struct cli_writeall_state);
1108 NTSTATUS status;
1109 size_t written, to_write;
1110
1111 status = cli_write_andx_recv(subreq, &written);
1112 TALLOC_FREE(subreq);
1113 if (tevent_req_nterror(req, status)) {
1114 return;
1115 }
1116
1117 state->written += written;
1118
1119 if (state->written > state->size) {
1120 tevent_req_nterror(req, NT_STATUS_INVALID_NETWORK_RESPONSE);
1121 return;
1122 }
1123
1124 to_write = state->size - state->written;
1125
1126 if (to_write == 0) {
1127 tevent_req_done(req);
1128 return;
1129 }
1130
1131 subreq = cli_write_andx_send(state, state->ev, state->cli, state->fnum,
1132 state->mode,
1133 state->buf + state->written,
1134 state->offset + state->written, to_write);
1135 if (tevent_req_nomem(subreq, req)) {
1136 return;
1137 }
1138 tevent_req_set_callback(subreq, cli_writeall_written, req);
1139 }
1140
1141 static NTSTATUS cli_writeall_recv(struct tevent_req *req,
1142 size_t *pwritten)
1143 {
1144 struct cli_writeall_state *state = tevent_req_data(
1145 req, struct cli_writeall_state);
1146 NTSTATUS status;
1147
1148 if (tevent_req_is_nterror(req, &status)) {
1149 return status;
1150 }
1151 if (pwritten != NULL) {
1152 *pwritten = state->written;
1153 }
1154 return NT_STATUS_OK;
1155 }
1156
1157 NTSTATUS cli_writeall(struct cli_state *cli, uint16_t fnum, uint16_t mode,
1158 const uint8_t *buf, off_t offset, size_t size,
1159 size_t *pwritten)
1160 {
1161 TALLOC_CTX *frame = talloc_stackframe();
1162 struct event_context *ev;
1163 struct tevent_req *req;
1164 NTSTATUS status = NT_STATUS_NO_MEMORY;
1165
1166 if (cli_has_async_calls(cli)) {
1167 /*
1168 * Can't use sync call while an async call is in flight
1169 */
1170 status = NT_STATUS_INVALID_PARAMETER;
1171 goto fail;
1172 }
1173 ev = event_context_init(frame);
1174 if (ev == NULL) {
1175 goto fail;
1176 }
1177 req = cli_writeall_send(frame, ev, cli, fnum, mode, buf, offset, size);
1178 if (req == NULL) {
1179 goto fail;
1180 }
1181 if (!tevent_req_poll(req, ev)) {
1182 status = map_nt_error_from_unix(errno);
1183 goto fail;
1184 }
1185 status = cli_writeall_recv(req, pwritten);
1186 fail:
1187 TALLOC_FREE(frame);
1188 if (!NT_STATUS_IS_OK(status)) {
1189 cli_set_error(cli, status);
1190 }
1191 return status;
1192 }
1193
1194 struct cli_push_write_state {
1195 struct tevent_req *req;/* This is the main request! Not the subreq */
1196 uint32_t idx;
1197 off_t ofs;
1198 uint8_t *buf;
1199 size_t size;
1200 };
1201
1202 struct cli_push_state {
1203 struct event_context *ev;
1204 struct cli_state *cli;
1205 uint16_t fnum;
1206 uint16_t mode;
1207 off_t start_offset;
1208 size_t window_size;
1209
1210 size_t (*source)(uint8_t *buf, size_t n, void *priv);
1211 void *priv;
1212
1213 bool eof;
1214
1215 size_t chunk_size;
1216 off_t next_offset;
1217
1218 /*
1219 * Outstanding requests
1220 */
1221 uint32_t pending;
1222 uint32_t num_reqs;
1223 struct cli_push_write_state **reqs;
1224 };
1225
1226 static void cli_push_written(struct tevent_req *req);
1227
1228 static bool cli_push_write_setup(struct tevent_req *req,
1229 struct cli_push_state *state,
1230 uint32_t idx)
1231 {
1232 struct cli_push_write_state *substate;
1233 struct tevent_req *subreq;
1234
1235 substate = talloc(state->reqs, struct cli_push_write_state);
1236 if (!substate) {
1237 return false;
1238 }
1239 substate->req = req;
1240 substate->idx = idx;
1241 substate->ofs = state->next_offset;
1242 substate->buf = talloc_array(substate, uint8_t, state->chunk_size);
1243 if (!substate->buf) {
1244 talloc_free(substate);
1245 return false;
1246 }
1247 substate->size = state->source(substate->buf,
1248 state->chunk_size,
1249 state->priv);
1250 if (substate->size == 0) {
1251 state->eof = true;
1252 /* nothing to send */
1253 talloc_free(substate);
1254 return true;
1255 }
1256
1257 subreq = cli_writeall_send(substate,
1258 state->ev, state->cli,
1259 state->fnum, state->mode,
1260 substate->buf,
1261 substate->ofs,
1262 substate->size);
1263 if (!subreq) {
1264 talloc_free(substate);
1265 return false;
1266 }
1267 tevent_req_set_callback(subreq, cli_push_written, substate);
1268
1269 state->reqs[idx] = substate;
1270 state->pending += 1;
1271 state->next_offset += substate->size;
1272
1273 return true;
1274 }
1275
1276 struct tevent_req *cli_push_send(TALLOC_CTX *mem_ctx, struct event_context *ev,
1277 struct cli_state *cli,
1278 uint16_t fnum, uint16_t mode,
1279 off_t start_offset, size_t window_size,
1280 size_t (*source)(uint8_t *buf, size_t n,
1281 void *priv),
1282 void *priv)
1283 {
1284 struct tevent_req *req;
1285 struct cli_push_state *state;
1286 uint32_t i;
1287
1288 req = tevent_req_create(mem_ctx, &state, struct cli_push_state);
1289 if (req == NULL) {
1290 return NULL;
1291 }
1292 state->cli = cli;
1293 state->ev = ev;
1294 state->fnum = fnum;
1295 state->start_offset = start_offset;
1296 state->mode = mode;
1297 state->source = source;
1298 state->priv = priv;
1299 state->eof = false;
1300 state->pending = 0;
1301 state->next_offset = start_offset;
1302
1303 state->chunk_size = cli_write_max_bufsize(cli, mode);
1304
1305 if (window_size == 0) {
1306 window_size = cli->max_mux * state->chunk_size;
1307 }
1308 state->num_reqs = window_size/state->chunk_size;
1309 if ((window_size % state->chunk_size) > 0) {
1310 state->num_reqs += 1;
1311 }
1312 state->num_reqs = MIN(state->num_reqs, cli->max_mux);
1313 state->num_reqs = MAX(state->num_reqs, 1);
1314
1315 state->reqs = TALLOC_ZERO_ARRAY(state, struct cli_push_write_state *,
1316 state->num_reqs);
1317 if (state->reqs == NULL) {
1318 goto failed;
1319 }
1320
1321 for (i=0; i<state->num_reqs; i++) {
1322 if (!cli_push_write_setup(req, state, i)) {
1323 goto failed;
1324 }
1325
1326 if (state->eof) {
1327 break;
1328 }
1329 }
1330
1331 if (state->pending == 0) {
1332 tevent_req_done(req);
1333 return tevent_req_post(req, ev);
1334 }
1335
1336 return req;
1337
1338 failed:
1339 tevent_req_nterror(req, NT_STATUS_NO_MEMORY);
1340 return tevent_req_post(req, ev);
1341 }
1342
1343 static void cli_push_written(struct tevent_req *subreq)
1344 {
1345 struct cli_push_write_state *substate = tevent_req_callback_data(
1346 subreq, struct cli_push_write_state);
1347 struct tevent_req *req = substate->req;
1348 struct cli_push_state *state = tevent_req_data(
1349 req, struct cli_push_state);
1350 NTSTATUS status;
1351 uint32_t idx = substate->idx;
1352
1353 state->reqs[idx] = NULL;
1354 state->pending -= 1;
1355
1356 status = cli_writeall_recv(subreq, NULL);
1357 TALLOC_FREE(subreq);
1358 TALLOC_FREE(substate);
1359 if (tevent_req_nterror(req, status)) {
1360 return;
1361 }
1362
1363 if (!state->eof) {
1364 if (!cli_push_write_setup(req, state, idx)) {
1365 tevent_req_nterror(req, NT_STATUS_NO_MEMORY);
1366 return;
1367 }
1368 }
1369
1370 if (state->pending == 0) {
1371 tevent_req_done(req);
1372 return;
1373 }
1374 }
1375
1376 NTSTATUS cli_push_recv(struct tevent_req *req)
1377 {
1378 return tevent_req_simple_recv_ntstatus(req);
1379 }
1380
1381 NTSTATUS cli_push(struct cli_state *cli, uint16_t fnum, uint16_t mode,
1382 off_t start_offset, size_t window_size,
1383 size_t (*source)(uint8_t *buf, size_t n, void *priv),
1384 void *priv)
1385 {
1386 TALLOC_CTX *frame = talloc_stackframe();
1387 struct event_context *ev;
1388 struct tevent_req *req;
1389 NTSTATUS status = NT_STATUS_OK;
1390
1391 if (cli_has_async_calls(cli)) {
1392 /*
1393 * Can't use sync call while an async call is in flight
1394 */
1395 status = NT_STATUS_INVALID_PARAMETER;
1396 goto fail;
1397 }
1398
1399 ev = event_context_init(frame);
1400 if (ev == NULL) {
1401 status = NT_STATUS_NO_MEMORY;
1402 goto fail;
1403 }
1404
1405 req = cli_push_send(frame, ev, cli, fnum, mode, start_offset,
1406 window_size, source, priv);
1407 if (req == NULL) {
1408 status = NT_STATUS_NO_MEMORY;
1409 goto fail;
1410 }
1411
1412 if (!tevent_req_poll(req, ev)) {
1413 status = map_nt_error_from_unix(errno);
1414 goto fail;
1415 }
1416
1417 status = cli_push_recv(req);
1418 fail:
1419 TALLOC_FREE(frame);
1420 if (!NT_STATUS_IS_OK(status)) {
1421 cli_set_error(cli, status);
1422 }
1423 return status;
1424 }
Samba GIT mirror