2 Unix SMB/CIFS implementation.
3 Infrastructure for async SMB client requests
4 Copyright (C) Volker Lendecke 2008
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.
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.
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/>.
21 #include "libsmb/libsmb.h"
22 #include "../lib/async_req/async_sock.h"
23 #include "../lib/util/tevent_ntstatus.h"
24 #include "../lib/util/tevent_unix.h"
25 #include "async_smb.h"
26 #include "smb_crypt.h"
27 #include "libsmb/nmblib.h"
30 static NTSTATUS cli_pull_raw_error(const uint8_t *buf)
32 uint32_t flags2 = SVAL(buf, smb_flg2);
33 NTSTATUS status = NT_STATUS(IVAL(buf, smb_rcls));
35 if (NT_STATUS_IS_OK(status)) {
39 if (flags2 & FLAGS2_32_BIT_ERROR_CODES) {
43 return NT_STATUS_DOS(CVAL(buf, smb_rcls), SVAL(buf,smb_err));
47 * Figure out if there is an andx command behind the current one
48 * @param[in] buf The smb buffer to look at
49 * @param[in] ofs The offset to the wct field that is followed by the cmd
50 * @retval Is there a command following?
53 static bool have_andx_command(const char *buf, uint16_t ofs)
56 size_t buflen = talloc_get_size(buf);
58 if ((ofs == buflen-1) || (ofs == buflen)) {
65 * Not enough space for the command and a following pointer
69 return (CVAL(buf, ofs+1) != 0xff);
74 struct cli_smb_state {
75 struct tevent_context *ev;
76 struct cli_state *cli;
77 uint8_t header[smb_wct+1]; /* Space for the header including the wct */
80 * For normal requests, cli_smb_req_send chooses a mid. Secondary
81 * trans requests need to use the mid of the primary request, so we
82 * need a place to store it. Assume it's set if != 0.
87 uint8_t bytecount_buf[2];
89 struct iovec iov[MAX_SMB_IOV+3];
96 struct tevent_req **chained_requests;
101 static uint16_t cli_alloc_mid(struct cli_state *cli)
103 int num_pending = talloc_array_length(cli->conn.pending);
109 result = cli->conn.smb1.mid++;
110 if ((result == 0) || (result == 0xffff)) {
114 for (i=0; i<num_pending; i++) {
115 if (result == cli_smb_req_mid(cli->conn.pending[i])) {
120 if (i == num_pending) {
126 void cli_smb_req_unset_pending(struct tevent_req *req)
128 struct cli_smb_state *state = tevent_req_data(
129 req, struct cli_smb_state);
130 struct cli_state *cli = state->cli;
131 int num_pending = talloc_array_length(cli->conn.pending);
134 if (state->mid != 0) {
136 * This is a [nt]trans[2] request which waits
137 * for more than one reply.
142 talloc_set_destructor(req, NULL);
144 if (num_pending == 1) {
146 * The pending read_smb tevent_req is a child of
147 * cli->pending. So if nothing is pending anymore, we need to
148 * delete the socket read fde.
150 TALLOC_FREE(cli->conn.pending);
151 cli->conn.read_smb_req = NULL;
155 for (i=0; i<num_pending; i++) {
156 if (req == cli->conn.pending[i]) {
160 if (i == num_pending) {
162 * Something's seriously broken. Just returning here is the
163 * right thing nevertheless, the point of this routine is to
164 * remove ourselves from cli->conn.pending.
170 * Remove ourselves from the cli->conn.pending array
172 for (; i < (num_pending - 1); i++) {
173 cli->conn.pending[i] = cli->conn.pending[i+1];
177 * No NULL check here, we're shrinking by sizeof(void *), and
178 * talloc_realloc just adjusts the size for this.
180 cli->conn.pending = talloc_realloc(NULL, cli->conn.pending,
186 static int cli_smb_req_destructor(struct tevent_req *req)
188 struct cli_smb_state *state = tevent_req_data(
189 req, struct cli_smb_state);
191 * Make sure we really remove it from
192 * the pending array on destruction.
195 cli_smb_req_unset_pending(req);
199 static bool cli_state_receive_next(struct cli_state *cli);
200 static void cli_state_notify_pending(struct cli_state *cli, NTSTATUS status);
202 bool cli_smb_req_set_pending(struct tevent_req *req)
204 struct cli_smb_state *state = tevent_req_data(
205 req, struct cli_smb_state);
206 struct cli_state *cli;
207 struct tevent_req **pending;
211 num_pending = talloc_array_length(cli->conn.pending);
213 pending = talloc_realloc(cli, cli->conn.pending, struct tevent_req *,
215 if (pending == NULL) {
218 pending[num_pending] = req;
219 cli->conn.pending = pending;
220 talloc_set_destructor(req, cli_smb_req_destructor);
222 if (!cli_state_receive_next(cli)) {
224 * the caller should notify the current request
226 * And all other pending requests get notified
227 * by cli_state_notify_pending().
229 cli_smb_req_unset_pending(req);
230 cli_state_notify_pending(cli, NT_STATUS_NO_MEMORY);
237 static void cli_smb_received(struct tevent_req *subreq);
238 static NTSTATUS cli_state_dispatch_smb1(struct cli_state *cli,
242 static bool cli_state_receive_next(struct cli_state *cli)
244 size_t num_pending = talloc_array_length(cli->conn.pending);
245 struct tevent_req *req;
246 struct cli_smb_state *state;
248 if (cli->conn.read_smb_req != NULL) {
252 if (num_pending == 0) {
256 req = cli->conn.pending[0];
257 state = tevent_req_data(req, struct cli_smb_state);
259 cli->conn.dispatch_incoming = cli_state_dispatch_smb1;
262 * We're the first ones, add the read_smb request that waits for the
263 * answer from the server
265 cli->conn.read_smb_req = read_smb_send(cli->conn.pending, state->ev,
267 if (cli->conn.read_smb_req == NULL) {
270 tevent_req_set_callback(cli->conn.read_smb_req, cli_smb_received, cli);
274 static void cli_state_notify_pending(struct cli_state *cli, NTSTATUS status)
276 cli_state_disconnect(cli);
279 * Cancel all pending requests. We do not do a for-loop walking
280 * cli->conn.pending because that array changes in
281 * cli_smb_req_destructor().
283 while (talloc_array_length(cli->conn.pending) > 0) {
284 struct tevent_req *req;
285 struct cli_smb_state *state;
287 req = cli->conn.pending[0];
288 state = tevent_req_data(req, struct cli_smb_state);
290 cli_smb_req_unset_pending(req);
293 * we need to defer the callback, because we may notify more
296 tevent_req_defer_callback(req, state->ev);
297 tevent_req_nterror(req, status);
302 * Fetch a smb request's mid. Only valid after the request has been sent by
303 * cli_smb_req_send().
305 uint16_t cli_smb_req_mid(struct tevent_req *req)
307 struct cli_smb_state *state = tevent_req_data(
308 req, struct cli_smb_state);
310 if (state->mid != 0) {
314 return SVAL(state->header, smb_mid);
317 void cli_smb_req_set_mid(struct tevent_req *req, uint16_t mid)
319 struct cli_smb_state *state = tevent_req_data(
320 req, struct cli_smb_state);
324 uint32_t cli_smb_req_seqnum(struct tevent_req *req)
326 struct cli_smb_state *state = tevent_req_data(
327 req, struct cli_smb_state);
328 return state->seqnum;
331 void cli_smb_req_set_seqnum(struct tevent_req *req, uint32_t seqnum)
333 struct cli_smb_state *state = tevent_req_data(
334 req, struct cli_smb_state);
335 state->seqnum = seqnum;
338 static size_t iov_len(const struct iovec *iov, int count)
342 for (i=0; i<count; i++) {
343 result += iov[i].iov_len;
348 static uint8_t *iov_concat(TALLOC_CTX *mem_ctx, const struct iovec *iov,
351 size_t len = iov_len(iov, count);
356 buf = talloc_array(mem_ctx, uint8_t, len);
361 for (i=0; i<count; i++) {
362 memcpy(buf+copied, iov[i].iov_base, iov[i].iov_len);
363 copied += iov[i].iov_len;
368 struct tevent_req *cli_smb_req_create(TALLOC_CTX *mem_ctx,
369 struct event_context *ev,
370 struct cli_state *cli,
372 uint8_t additional_flags,
373 uint8_t wct, uint16_t *vwv,
375 struct iovec *bytes_iov)
377 struct tevent_req *result;
378 struct cli_smb_state *state;
379 struct timeval endtime;
381 if (iov_count > MAX_SMB_IOV) {
383 * Should not happen :-)
388 result = tevent_req_create(mem_ctx, &state, struct cli_smb_state);
389 if (result == NULL) {
394 state->mid = 0; /* Set to auto-choose in cli_smb_req_send */
395 state->chain_num = 0;
396 state->chained_requests = NULL;
398 cli_setup_packet_buf(cli, (char *)state->header);
399 SCVAL(state->header, smb_com, smb_command);
400 SSVAL(state->header, smb_tid, cli->smb1.tid);
401 SCVAL(state->header, smb_wct, wct);
405 SSVAL(state->bytecount_buf, 0, iov_len(bytes_iov, iov_count));
407 state->iov[0].iov_base = (void *)state->header;
408 state->iov[0].iov_len = sizeof(state->header);
409 state->iov[1].iov_base = (void *)state->vwv;
410 state->iov[1].iov_len = wct * sizeof(uint16_t);
411 state->iov[2].iov_base = (void *)state->bytecount_buf;
412 state->iov[2].iov_len = sizeof(uint16_t);
414 if (iov_count != 0) {
415 memcpy(&state->iov[3], bytes_iov,
416 iov_count * sizeof(*bytes_iov));
418 state->iov_count = iov_count + 3;
421 endtime = timeval_current_ofs_msec(cli->timeout);
422 if (!tevent_req_set_endtime(result, ev, endtime)) {
427 switch (smb_command) {
432 state->one_way = true;
436 (CVAL(vwv+3, 0) == LOCKING_ANDX_OPLOCK_RELEASE)) {
437 state->one_way = true;
445 static NTSTATUS cli_signv(struct cli_state *cli, struct iovec *iov, int count,
451 * Obvious optimization: Make cli_calculate_sign_mac work with struct
452 * iovec directly. MD5Update would do that just fine.
455 if ((count <= 0) || (iov[0].iov_len < smb_wct)) {
456 return NT_STATUS_INVALID_PARAMETER;
459 buf = iov_concat(talloc_tos(), iov, count);
461 return NT_STATUS_NO_MEMORY;
464 cli_calculate_sign_mac(cli, (char *)buf, seqnum);
465 memcpy(iov[0].iov_base, buf, iov[0].iov_len);
471 static void cli_smb_sent(struct tevent_req *subreq);
473 static NTSTATUS cli_smb_req_iov_send(struct tevent_req *req,
474 struct cli_smb_state *state,
475 struct iovec *iov, int iov_count)
477 struct tevent_req *subreq;
480 if (!cli_state_is_connected(state->cli)) {
481 return NT_STATUS_CONNECTION_DISCONNECTED;
484 if (iov[0].iov_len < smb_wct) {
485 return NT_STATUS_INVALID_PARAMETER;
488 if (state->mid != 0) {
489 SSVAL(iov[0].iov_base, smb_mid, state->mid);
491 uint16_t mid = cli_alloc_mid(state->cli);
492 SSVAL(iov[0].iov_base, smb_mid, mid);
495 smb_setlen((char *)iov[0].iov_base, iov_len(iov, iov_count) - 4);
497 status = cli_signv(state->cli, iov, iov_count, &state->seqnum);
499 if (!NT_STATUS_IS_OK(status)) {
503 if (cli_state_encryption_on(state->cli)) {
506 buf = (char *)iov_concat(talloc_tos(), iov, iov_count);
508 return NT_STATUS_NO_MEMORY;
510 status = common_encrypt_buffer(state->cli->trans_enc_state,
511 (char *)buf, &enc_buf);
513 if (!NT_STATUS_IS_OK(status)) {
514 DEBUG(0, ("Error in encrypting client message: %s\n",
518 buf = (char *)talloc_memdup(state, enc_buf,
522 return NT_STATUS_NO_MEMORY;
524 iov[0].iov_base = (void *)buf;
525 iov[0].iov_len = talloc_get_size(buf);
528 subreq = writev_send(state, state->ev, state->cli->conn.outgoing,
529 state->cli->conn.fd, false, iov, iov_count);
530 if (subreq == NULL) {
531 return NT_STATUS_NO_MEMORY;
533 tevent_req_set_callback(subreq, cli_smb_sent, req);
537 NTSTATUS cli_smb_req_send(struct tevent_req *req)
539 struct cli_smb_state *state = tevent_req_data(
540 req, struct cli_smb_state);
542 return cli_smb_req_iov_send(req, state, state->iov, state->iov_count);
545 struct tevent_req *cli_smb_send(TALLOC_CTX *mem_ctx,
546 struct event_context *ev,
547 struct cli_state *cli,
549 uint8_t additional_flags,
550 uint8_t wct, uint16_t *vwv,
552 const uint8_t *bytes)
554 struct tevent_req *req;
558 iov.iov_base = discard_const_p(void, bytes);
559 iov.iov_len = num_bytes;
561 req = cli_smb_req_create(mem_ctx, ev, cli, smb_command,
562 additional_flags, wct, vwv, 1, &iov);
566 if (!tevent_req_is_in_progress(req)) {
567 return tevent_req_post(req, ev);
569 status = cli_smb_req_send(req);
570 if (!NT_STATUS_IS_OK(status)) {
571 tevent_req_nterror(req, status);
572 return tevent_req_post(req, ev);
577 static void cli_smb_sent(struct tevent_req *subreq)
579 struct tevent_req *req = tevent_req_callback_data(
580 subreq, struct tevent_req);
581 struct cli_smb_state *state = tevent_req_data(
582 req, struct cli_smb_state);
586 nwritten = writev_recv(subreq, &err);
588 if (nwritten == -1) {
589 NTSTATUS status = map_nt_error_from_unix(err);
590 cli_state_notify_pending(state->cli, status);
594 if (state->one_way) {
596 tevent_req_done(req);
600 if (!cli_smb_req_set_pending(req)) {
601 tevent_req_nterror(req, NT_STATUS_NO_MEMORY);
606 static void cli_smb_received(struct tevent_req *subreq)
608 struct cli_state *cli = tevent_req_callback_data(
609 subreq, struct cli_state);
610 TALLOC_CTX *frame = talloc_stackframe();
616 if (subreq != cli->conn.read_smb_req) {
617 DEBUG(1, ("Internal error: cli_smb_received called with "
618 "unexpected subreq\n"));
619 status = NT_STATUS_INTERNAL_ERROR;
620 cli_state_notify_pending(cli, status);
625 received = read_smb_recv(subreq, frame, &inbuf, &err);
627 cli->conn.read_smb_req = NULL;
628 if (received == -1) {
629 status = map_nt_error_from_unix(err);
630 cli_state_notify_pending(cli, status);
635 status = cli->conn.dispatch_incoming(cli, frame, inbuf);
637 if (NT_STATUS_IS_OK(status)) {
639 * We should not do any more processing
640 * as the dispatch function called
644 } else if (!NT_STATUS_EQUAL(status, NT_STATUS_RETRY)) {
646 * We got an error, so notify all pending requests
648 cli_state_notify_pending(cli, status);
653 * We got NT_STATUS_RETRY, so we may ask for a
656 if (!cli_state_receive_next(cli)) {
657 cli_state_notify_pending(cli, NT_STATUS_NO_MEMORY);
661 static NTSTATUS cli_state_dispatch_smb1(struct cli_state *cli,
665 struct tevent_req *req;
666 struct cli_smb_state *state;
673 if ((IVAL(inbuf, 4) != 0x424d53ff) /* 0xFF"SMB" */
674 && (SVAL(inbuf, 4) != 0x45ff)) /* 0xFF"E" */ {
675 DEBUG(10, ("Got non-SMB PDU\n"));
676 return NT_STATUS_INVALID_NETWORK_RESPONSE;
679 if (cli_state_encryption_on(cli) && (CVAL(inbuf, 0) == 0)) {
680 uint16_t enc_ctx_num;
682 status = get_enc_ctx_num(inbuf, &enc_ctx_num);
683 if (!NT_STATUS_IS_OK(status)) {
684 DEBUG(10, ("get_enc_ctx_num returned %s\n",
689 if (enc_ctx_num != cli->trans_enc_state->enc_ctx_num) {
690 DEBUG(10, ("wrong enc_ctx %d, expected %d\n",
692 cli->trans_enc_state->enc_ctx_num));
693 return NT_STATUS_INVALID_HANDLE;
696 status = common_decrypt_buffer(cli->trans_enc_state,
698 if (!NT_STATUS_IS_OK(status)) {
699 DEBUG(10, ("common_decrypt_buffer returned %s\n",
705 mid = SVAL(inbuf, smb_mid);
706 num_pending = talloc_array_length(cli->conn.pending);
708 for (i=0; i<num_pending; i++) {
709 if (mid == cli_smb_req_mid(cli->conn.pending[i])) {
713 if (i == num_pending) {
714 /* Dump unexpected reply */
715 return NT_STATUS_RETRY;
718 oplock_break = false;
722 * Paranoia checks that this is really an oplock break request.
724 oplock_break = (smb_len(inbuf) == 51); /* hdr + 8 words */
725 oplock_break &= ((CVAL(inbuf, smb_flg) & FLAG_REPLY) == 0);
726 oplock_break &= (CVAL(inbuf, smb_com) == SMBlockingX);
727 oplock_break &= (SVAL(inbuf, smb_vwv6) == 0);
728 oplock_break &= (SVAL(inbuf, smb_vwv7) == 0);
731 /* Dump unexpected reply */
732 return NT_STATUS_RETRY;
736 req = cli->conn.pending[i];
737 state = tevent_req_data(req, struct cli_smb_state);
739 if (!oplock_break /* oplock breaks are not signed */
740 && !cli_check_sign_mac(cli, (char *)inbuf, state->seqnum+1)) {
741 DEBUG(10, ("cli_check_sign_mac failed\n"));
742 return NT_STATUS_ACCESS_DENIED;
745 if (state->chained_requests != NULL) {
746 struct tevent_req **chain = talloc_move(frame,
747 &state->chained_requests);
748 int num_chained = talloc_array_length(chain);
751 * We steal the inbuf to the chain,
752 * so that it will stay until all
753 * requests of the chain are finished.
755 * Each requests in the chain will
756 * hold a talloc reference to the chain.
757 * This way we do not expose the talloc_reference()
758 * behavior to the callers.
760 talloc_steal(chain, inbuf);
762 for (i=0; i<num_chained; i++) {
763 struct tevent_req **ref;
766 state = tevent_req_data(req, struct cli_smb_state);
768 cli_smb_req_unset_pending(req);
771 * as we finish multiple requests here
772 * we need to defer the callbacks as
773 * they could destroy our current stack state.
775 tevent_req_defer_callback(req, state->ev);
777 ref = talloc_reference(state, chain);
778 if (tevent_req_nomem(ref, req)) {
782 state->inbuf = inbuf;
783 state->chain_num = i;
784 state->chain_length = num_chained;
786 tevent_req_done(req);
789 return NT_STATUS_RETRY;
792 cli_smb_req_unset_pending(req);
794 state->inbuf = talloc_move(state, &inbuf);
795 state->chain_num = 0;
796 state->chain_length = 1;
798 if (talloc_array_length(cli->conn.pending) == 0) {
799 tevent_req_done(req);
803 tevent_req_defer_callback(req, state->ev);
804 tevent_req_done(req);
805 return NT_STATUS_RETRY;
808 NTSTATUS cli_smb_recv(struct tevent_req *req,
809 TALLOC_CTX *mem_ctx, uint8_t **pinbuf,
810 uint8_t min_wct, uint8_t *pwct, uint16_t **pvwv,
811 uint32_t *pnum_bytes, uint8_t **pbytes)
813 struct cli_smb_state *state = tevent_req_data(
814 req, struct cli_smb_state);
815 NTSTATUS status = NT_STATUS_OK;
818 size_t wct_ofs, bytes_offset;
821 if (tevent_req_is_nterror(req, &status)) {
825 if (state->inbuf == NULL) {
827 return NT_STATUS_INVALID_NETWORK_RESPONSE;
844 /* This was a request without a reply */
849 cmd = CVAL(state->inbuf, smb_com);
851 for (i=0; i<state->chain_num; i++) {
852 if (i < state->chain_num-1) {
854 return NT_STATUS_REQUEST_ABORTED;
856 if (!is_andx_req(cmd)) {
857 return NT_STATUS_INVALID_NETWORK_RESPONSE;
861 if (!have_andx_command((char *)state->inbuf, wct_ofs)) {
863 * This request was not completed because a previous
864 * request in the chain had received an error.
866 return NT_STATUS_REQUEST_ABORTED;
869 wct_ofs = SVAL(state->inbuf, wct_ofs + 3);
872 * Skip the all-present length field. No overflow, we've just
873 * put a 16-bit value into a size_t.
877 if (wct_ofs+2 > talloc_get_size(state->inbuf)) {
878 return NT_STATUS_INVALID_NETWORK_RESPONSE;
881 cmd = CVAL(state->inbuf, wct_ofs + 1);
884 state->cli->raw_status = cli_pull_raw_error(state->inbuf);
885 if (NT_STATUS_IS_DOS(state->cli->raw_status)) {
886 uint8_t eclass = NT_STATUS_DOS_CLASS(state->cli->raw_status);
887 uint16_t ecode = NT_STATUS_DOS_CODE(state->cli->raw_status);
889 * TODO: is it really a good idea to do a mapping here?
891 * The old cli_pull_error() also does it, so I do not change
894 status = dos_to_ntstatus(eclass, ecode);
896 status = state->cli->raw_status;
899 if (!have_andx_command((char *)state->inbuf, wct_ofs)) {
901 if ((cmd == SMBsesssetupX)
903 status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
905 * NT_STATUS_MORE_PROCESSING_REQUIRED is a
906 * valid return code for session setup
911 if (NT_STATUS_IS_ERR(status)) {
913 * The last command takes the error code. All
914 * further commands down the requested chain
915 * will get a NT_STATUS_REQUEST_ABORTED.
923 wct = CVAL(state->inbuf, wct_ofs);
924 bytes_offset = wct_ofs + 1 + wct * sizeof(uint16_t);
925 num_bytes = SVAL(state->inbuf, bytes_offset);
928 return NT_STATUS_INVALID_NETWORK_RESPONSE;
932 * wct_ofs is a 16-bit value plus 4, wct is a 8-bit value, num_bytes
933 * is a 16-bit value. So bytes_offset being size_t should be far from
936 if ((bytes_offset + 2 > talloc_get_size(state->inbuf))
937 || (bytes_offset > 0xffff)) {
938 return NT_STATUS_INVALID_NETWORK_RESPONSE;
945 *pvwv = (uint16_t *)(state->inbuf + wct_ofs + 1);
947 if (pnum_bytes != NULL) {
948 *pnum_bytes = num_bytes;
950 if (pbytes != NULL) {
951 *pbytes = (uint8_t *)state->inbuf + bytes_offset + 2;
953 if ((mem_ctx != NULL) && (pinbuf != NULL)) {
954 if (state->chain_num == state->chain_length-1) {
955 *pinbuf = talloc_move(mem_ctx, &state->inbuf);
957 *pinbuf = state->inbuf;
964 size_t cli_smb_wct_ofs(struct tevent_req **reqs, int num_reqs)
969 wct_ofs = smb_wct - 4;
971 for (i=0; i<num_reqs; i++) {
972 struct cli_smb_state *state;
973 state = tevent_req_data(reqs[i], struct cli_smb_state);
974 wct_ofs += iov_len(state->iov+1, state->iov_count-1);
975 wct_ofs = (wct_ofs + 3) & ~3;
980 NTSTATUS cli_smb_chain_send(struct tevent_req **reqs, int num_reqs)
982 struct cli_smb_state *first_state = tevent_req_data(
983 reqs[0], struct cli_smb_state);
984 struct cli_smb_state *last_state = tevent_req_data(
985 reqs[num_reqs-1], struct cli_smb_state);
986 struct cli_smb_state *state;
988 size_t chain_padding = 0;
990 struct iovec *iov = NULL;
991 struct iovec *this_iov;
995 for (i=0; i<num_reqs; i++) {
996 state = tevent_req_data(reqs[i], struct cli_smb_state);
997 iovlen += state->iov_count;
1000 iov = talloc_array(last_state, struct iovec, iovlen);
1002 return NT_STATUS_NO_MEMORY;
1005 first_state->chained_requests = (struct tevent_req **)talloc_memdup(
1006 last_state, reqs, sizeof(*reqs) * num_reqs);
1007 if (first_state->chained_requests == NULL) {
1009 return NT_STATUS_NO_MEMORY;
1012 wct_offset = smb_wct - 4;
1015 for (i=0; i<num_reqs; i++) {
1016 size_t next_padding = 0;
1019 state = tevent_req_data(reqs[i], struct cli_smb_state);
1021 if (i < num_reqs-1) {
1022 if (!is_andx_req(CVAL(state->header, smb_com))
1023 || CVAL(state->header, smb_wct) < 2) {
1025 TALLOC_FREE(first_state->chained_requests);
1026 return NT_STATUS_INVALID_PARAMETER;
1030 wct_offset += iov_len(state->iov+1, state->iov_count-1) + 1;
1031 if ((wct_offset % 4) != 0) {
1032 next_padding = 4 - (wct_offset % 4);
1034 wct_offset += next_padding;
1037 if (i < num_reqs-1) {
1038 struct cli_smb_state *next_state = tevent_req_data(
1039 reqs[i+1], struct cli_smb_state);
1040 SCVAL(vwv+0, 0, CVAL(next_state->header, smb_com));
1042 SSVAL(vwv+1, 0, wct_offset);
1043 } else if (is_andx_req(CVAL(state->header, smb_com))) {
1044 /* properly end the chain */
1045 SCVAL(vwv+0, 0, 0xff);
1046 SCVAL(vwv+0, 1, 0xff);
1051 this_iov[0] = state->iov[0];
1054 * This one is a bit subtle. We have to add
1055 * chain_padding bytes between the requests, and we
1056 * have to also include the wct field of the
1057 * subsequent requests. We use the subsequent header
1058 * for the padding, it contains the wct field in its
1061 this_iov[0].iov_len = chain_padding+1;
1062 this_iov[0].iov_base = (void *)&state->header[
1063 sizeof(state->header) - this_iov[0].iov_len];
1064 memset(this_iov[0].iov_base, 0, this_iov[0].iov_len-1);
1066 memcpy(this_iov+1, state->iov+1,
1067 sizeof(struct iovec) * (state->iov_count-1));
1068 this_iov += state->iov_count;
1069 chain_padding = next_padding;
1072 status = cli_smb_req_iov_send(reqs[0], last_state, iov, iovlen);
1073 if (!NT_STATUS_IS_OK(status)) {
1075 TALLOC_FREE(first_state->chained_requests);
1079 return NT_STATUS_OK;
1082 bool cli_has_async_calls(struct cli_state *cli)
1084 return ((tevent_queue_length(cli->conn.outgoing) != 0)
1085 || (talloc_array_length(cli->conn.pending) != 0));