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/>.
22 static void cli_state_handler(struct event_context *event_ctx,
23 struct fd_event *event, uint16 flags, void *p);
26 * Fetch an error out of a NBT packet
27 * @param[in] buf The SMB packet
28 * @retval The error, converted to NTSTATUS
31 NTSTATUS cli_pull_error(char *buf)
33 uint32_t flags2 = SVAL(buf, smb_flg2);
35 if (flags2 & FLAGS2_32_BIT_ERROR_CODES) {
36 return NT_STATUS(IVAL(buf, smb_rcls));
39 /* if the client uses dos errors, but there is no error,
40 we should return no error here, otherwise it looks
41 like an unknown bad NT_STATUS. jmcd */
42 if (CVAL(buf, smb_rcls) == 0)
45 return NT_STATUS_DOS(CVAL(buf, smb_rcls), SVAL(buf,smb_err));
49 * Compatibility helper for the sync APIs: Fake NTSTATUS in cli->inbuf
50 * @param[in] cli The client connection that just received an error
51 * @param[in] status The error to set on "cli"
54 void cli_set_error(struct cli_state *cli, NTSTATUS status)
56 uint32_t flags2 = SVAL(cli->inbuf, smb_flg2);
58 if (NT_STATUS_IS_DOS(status)) {
59 SSVAL(cli->inbuf, smb_flg2,
60 flags2 & ~FLAGS2_32_BIT_ERROR_CODES);
61 SCVAL(cli->inbuf, smb_rcls, NT_STATUS_DOS_CLASS(status));
62 SSVAL(cli->inbuf, smb_err, NT_STATUS_DOS_CODE(status));
66 SSVAL(cli->inbuf, smb_flg2, flags2 | FLAGS2_32_BIT_ERROR_CODES);
67 SIVAL(cli->inbuf, smb_rcls, NT_STATUS_V(status));
73 * @param[in] cli The client connection
74 * @retval The new, unused mid
77 static uint16_t cli_new_mid(struct cli_state *cli)
80 struct cli_request *req;
88 for (req = cli->outstanding_requests; req; req = req->next) {
89 if (result == req->mid) {
101 * Print an async req that happens to be a cli_request
102 * @param[in] mem_ctx The TALLOC_CTX to put the result on
103 * @param[in] req The request to print
104 * @retval The string representation of "req"
107 static char *cli_request_print(TALLOC_CTX *mem_ctx, struct async_req *req)
109 char *result = async_req_print(mem_ctx, req);
110 struct cli_request *cli_req = talloc_get_type_abort(
111 req->private_data, struct cli_request);
113 if (result == NULL) {
117 return talloc_asprintf_append_buffer(
118 result, "mid=%d\n", cli_req->mid);
122 * Destroy a cli_request
123 * @param[in] req The cli_request to kill
127 static int cli_request_destructor(struct cli_request *req)
129 if (req->enc_state != NULL) {
130 common_free_enc_buffer(req->enc_state, req->outbuf);
132 DLIST_REMOVE(req->cli->outstanding_requests, req);
133 if (req->cli->outstanding_requests == NULL) {
134 TALLOC_FREE(req->cli->fd_event);
140 * Are there already requests waiting in the chain_accumulator?
141 * @param[in] cli The cli_state we want to check
145 bool cli_in_chain(struct cli_state *cli)
147 if (cli->chain_accumulator == NULL) {
151 return (cli->chain_accumulator->num_async != 0);
155 * Is the SMB command able to hold an AND_X successor
156 * @param[in] cmd The SMB command in question
157 * @retval Can we add a chained request after "cmd"?
160 static bool is_andx_req(uint8_t cmd)
181 * @brief Find the smb_cmd offset of the last command pushed
182 * @param[in] buf The buffer we're building up
183 * @retval Where can we put our next andx cmd?
185 * While chaining requests, the "next" request we're looking at needs to put
186 * its SMB_Command before the data the previous request already built up added
187 * to the chain. Find the offset to the place where we have to put our cmd.
190 static bool find_andx_cmd_ofs(char *buf, size_t *pofs)
195 cmd = CVAL(buf, smb_com);
197 SMB_ASSERT(is_andx_req(cmd));
201 while (CVAL(buf, ofs) != 0xff) {
203 if (!is_andx_req(CVAL(buf, ofs))) {
208 * ofs is from start of smb header, so add the 4 length
209 * bytes. The next cmd is right after the wct field.
211 ofs = SVAL(buf, ofs+2) + 4 + 1;
213 SMB_ASSERT(ofs+4 < talloc_get_size(buf));
221 * @brief Do the smb chaining at a buffer level
222 * @param[in] poutbuf Pointer to the talloc'ed buffer to be modified
223 * @param[in] smb_command The command that we want to issue
224 * @param[in] wct How many words?
225 * @param[in] vwv The words, already in network order
226 * @param[in] bytes_alignment How shall we align "bytes"?
227 * @param[in] num_bytes How many bytes?
228 * @param[in] bytes The data the request ships
230 * smb_splice_chain() adds the vwv and bytes to the request already present in
234 bool smb_splice_chain(char **poutbuf, uint8_t smb_command,
235 uint8_t wct, const uint16_t *vwv,
236 size_t bytes_alignment,
237 uint16_t num_bytes, const uint8_t *bytes)
240 size_t old_size, new_size;
242 size_t chain_padding = 0;
243 size_t bytes_padding = 0;
246 old_size = talloc_get_size(*poutbuf);
249 * old_size == smb_wct means we're pushing the first request in for
253 first_request = (old_size == smb_wct);
255 if (!first_request && ((old_size % 4) != 0)) {
257 * Align the wct field of subsequent requests to a 4-byte
260 chain_padding = 4 - (old_size % 4);
264 * After the old request comes the new wct field (1 byte), the vwv's
265 * and the num_bytes field. After at we might need to align the bytes
266 * given to us to "bytes_alignment", increasing the num_bytes value.
269 new_size = old_size + chain_padding + 1 + wct * sizeof(uint16_t) + 2;
271 if ((bytes_alignment != 0) && ((new_size % bytes_alignment) != 0)) {
272 bytes_padding = bytes_alignment + (new_size % bytes_alignment);
275 new_size += bytes_padding + num_bytes;
277 if (new_size > 0xffff) {
278 DEBUG(1, ("splice_chain: %u bytes won't fit\n",
279 (unsigned)new_size));
283 outbuf = TALLOC_REALLOC_ARRAY(NULL, *poutbuf, char, new_size);
284 if (outbuf == NULL) {
285 DEBUG(0, ("talloc failed\n"));
291 SCVAL(outbuf, smb_com, smb_command);
295 if (!find_andx_cmd_ofs(outbuf, &andx_cmd_ofs)) {
296 DEBUG(1, ("invalid command chain\n"));
297 *poutbuf = TALLOC_REALLOC_ARRAY(
298 NULL, *poutbuf, char, old_size);
302 if (chain_padding != 0) {
303 memset(outbuf + old_size, 0, chain_padding);
304 old_size += chain_padding;
307 SCVAL(outbuf, andx_cmd_ofs, smb_command);
308 SSVAL(outbuf, andx_cmd_ofs + 2, old_size - 4);
313 SCVAL(outbuf, ofs, wct);
316 memcpy(outbuf + ofs, vwv, sizeof(uint16_t) * wct);
317 ofs += sizeof(uint16_t) * wct;
319 SSVAL(outbuf, ofs, num_bytes + bytes_padding);
320 ofs += sizeof(uint16_t);
322 if (bytes_padding != 0) {
323 memset(outbuf + ofs, 0, bytes_padding);
324 ofs += bytes_padding;
327 memcpy(outbuf + ofs, bytes, num_bytes);
333 * @brief Destroy an async_req that is the visible part of a cli_request
334 * @param[in] req The request to kill
335 * @retval Return 0 to make talloc happy
337 * This destructor is a bit tricky: Because a cli_request can host more than
338 * one async_req for chained requests, we need to make sure that the
339 * "cli_request" that we were part of is correctly destroyed at the right
340 * time. This is done by NULLing out ourself from the "async" member of our
341 * "cli_request". If there is none left, then also TALLOC_FREE() the
342 * cli_request, which was a talloc child of the client connection cli_state.
345 static int cli_async_req_destructor(struct async_req *req)
347 struct cli_request *cli_req = talloc_get_type_abort(
348 req->private_data, struct cli_request);
354 for (i=0; i<cli_req->num_async; i++) {
355 if (cli_req->async[i] == req) {
356 cli_req->async[i] = NULL;
359 if (cli_req->async[i] != NULL) {
367 TALLOC_FREE(cli_req);
374 * @brief Chain up a request
375 * @param[in] mem_ctx The TALLOC_CTX for the result
376 * @param[in] ev The event context that will call us back
377 * @param[in] cli The cli_state we queue the request up for
378 * @param[in] smb_command The command that we want to issue
379 * @param[in] additional_flags open_and_x wants to add oplock header flags
380 * @param[in] wct How many words?
381 * @param[in] vwv The words, already in network order
382 * @param[in] num_bytes How many bytes?
383 * @param[in] bytes The data the request ships
385 * cli_request_chain() is the core of the SMB request marshalling routine. It
386 * will create a new async_req structure in the cli->chain_accumulator->async
387 * array and marshall the smb_cmd, the vwv array and the bytes into
388 * cli->chain_accumulator->outbuf.
391 static struct async_req *cli_request_chain(TALLOC_CTX *mem_ctx,
392 struct event_context *ev,
393 struct cli_state *cli,
395 uint8_t additional_flags,
396 uint8_t wct, const uint16_t *vwv,
398 const uint8_t *bytes)
400 struct async_req **tmp_reqs;
401 struct cli_request *req;
403 req = cli->chain_accumulator;
405 tmp_reqs = TALLOC_REALLOC_ARRAY(req, req->async, struct async_req *,
407 if (tmp_reqs == NULL) {
408 DEBUG(0, ("talloc failed\n"));
411 req->async = tmp_reqs;
414 req->async[req->num_async-1] = async_req_new(mem_ctx, ev);
415 if (req->async[req->num_async-1] == NULL) {
416 DEBUG(0, ("async_req_new failed\n"));
420 req->async[req->num_async-1]->private_data = req;
421 req->async[req->num_async-1]->print = cli_request_print;
422 talloc_set_destructor(req->async[req->num_async-1],
423 cli_async_req_destructor);
425 if (!smb_splice_chain(&req->outbuf, smb_command, wct, vwv,
426 0, num_bytes, bytes)) {
430 return req->async[req->num_async-1];
433 TALLOC_FREE(req->async[req->num_async-1]);
439 * @brief prepare a cli_state to accept a chain of requests
440 * @param[in] cli The cli_state we want to queue up in
441 * @param[in] ev The event_context that will call us back for the socket
442 * @param[in] size_hint How many bytes are expected, just an optimization
443 * @retval Did we have enough memory?
445 * cli_chain_cork() sets up a new cli_request in cli->chain_accumulator. If
446 * cli is used in an async fashion, i.e. if we have outstanding requests, then
447 * we do not have to create a fd event. If cli is used only with the sync
448 * helpers, we need to create the fd_event here.
450 * If you want to issue a chained request to the server, do a
451 * cli_chain_cork(), then do you cli_open_send(), cli_read_and_x_send(),
452 * cli_close_send() and so on. The async requests that come out of
453 * cli_xxx_send() are normal async requests with the difference that they
454 * won't be shipped individually. But the event_context will still trigger the
455 * req->async.fn to be called on every single request.
457 * You have to take care yourself that you only issue chainable requests in
458 * the middle of the chain.
461 bool cli_chain_cork(struct cli_state *cli, struct event_context *ev,
464 struct cli_request *req = NULL;
466 SMB_ASSERT(cli->chain_accumulator == NULL);
469 DEBUG(10, ("cli->fd closed\n"));
473 if (cli->fd_event == NULL) {
474 SMB_ASSERT(cli->outstanding_requests == NULL);
475 cli->fd_event = event_add_fd(ev, cli, cli->fd,
477 cli_state_handler, cli);
478 if (cli->fd_event == NULL) {
483 req = talloc(cli, struct cli_request);
489 if (size_hint == 0) {
492 req->outbuf = talloc_array(req, char, smb_wct + size_hint);
493 if (req->outbuf == NULL) {
496 req->outbuf = TALLOC_REALLOC_ARRAY(NULL, req->outbuf, char, smb_wct);
501 req->enc_state = NULL;
502 req->recv_helper.fn = NULL;
504 SSVAL(req->outbuf, smb_tid, cli->cnum);
505 cli_setup_packet_buf(cli, req->outbuf);
507 req->mid = cli_new_mid(cli);
509 cli->chain_accumulator = req;
511 DEBUG(10, ("cli_chain_cork: mid=%d\n", req->mid));
516 if (cli->outstanding_requests == NULL) {
517 TALLOC_FREE(cli->fd_event);
523 * Ship a request queued up via cli_request_chain()
524 * @param[in] cl The connection
527 void cli_chain_uncork(struct cli_state *cli)
529 struct cli_request *req = cli->chain_accumulator;
531 SMB_ASSERT(req != NULL);
533 DLIST_ADD_END(cli->outstanding_requests, req, struct cli_request *);
534 talloc_set_destructor(req, cli_request_destructor);
536 cli->chain_accumulator = NULL;
538 SSVAL(req->outbuf, smb_mid, req->mid);
539 smb_setlen(req->outbuf, talloc_get_size(req->outbuf) - 4);
541 cli_calculate_sign_mac(cli, req->outbuf);
543 if (cli_encryption_on(cli)) {
547 status = cli_encrypt_message(cli, req->outbuf, &enc_buf);
548 if (!NT_STATUS_IS_OK(status)) {
549 DEBUG(0, ("Error in encrypting client message. "
550 "Error %s\n", nt_errstr(status)));
554 req->outbuf = enc_buf;
555 req->enc_state = cli->trans_enc_state;
560 event_fd_set_writeable(cli->fd_event);
564 * @brief Send a request to the server
565 * @param[in] mem_ctx The TALLOC_CTX for the result
566 * @param[in] ev The event context that will call us back
567 * @param[in] cli The cli_state we queue the request up for
568 * @param[in] smb_command The command that we want to issue
569 * @param[in] additional_flags open_and_x wants to add oplock header flags
570 * @param[in] wct How many words?
571 * @param[in] vwv The words, already in network order
572 * @param[in] num_bytes How many bytes?
573 * @param[in] bytes The data the request ships
575 * This is the generic routine to be used by the cli_xxx_send routines.
578 struct async_req *cli_request_send(TALLOC_CTX *mem_ctx,
579 struct event_context *ev,
580 struct cli_state *cli,
582 uint8_t additional_flags,
583 uint8_t wct, const uint16_t *vwv,
584 uint16_t num_bytes, const uint8_t *bytes)
586 struct async_req *result;
589 if (cli->chain_accumulator == NULL) {
590 if (!cli_chain_cork(cli, ev,
591 wct * sizeof(uint16_t) + num_bytes + 3)) {
592 DEBUG(1, ("cli_chain_cork failed\n"));
598 result = cli_request_chain(mem_ctx, ev, cli, smb_command,
599 additional_flags, wct, vwv,
602 if (result == NULL) {
603 DEBUG(1, ("cli_request_chain failed\n"));
607 cli_chain_uncork(cli);
614 * Figure out if there is an andx command behind the current one
615 * @param[in] buf The smb buffer to look at
616 * @param[in] ofs The offset to the wct field that is followed by the cmd
617 * @retval Is there a command following?
620 static bool have_andx_command(const char *buf, uint16_t ofs)
623 size_t buflen = talloc_get_size(buf);
625 if ((ofs == buflen-1) || (ofs == buflen)) {
629 wct = CVAL(buf, ofs);
632 * Not enough space for the command and a following pointer
636 return (CVAL(buf, ofs+1) != 0xff);
640 * @brief Pull reply data out of a request
641 * @param[in] req The request that we just received a reply for
642 * @param[out] pwct How many words did the server send?
643 * @param[out] pvwv The words themselves
644 * @param[out] pnum_bytes How many bytes did the server send?
645 * @param[out] pbytes The bytes themselves
646 * @retval Was the reply formally correct?
649 NTSTATUS cli_pull_reply(struct async_req *req,
650 uint8_t *pwct, uint16_t **pvwv,
651 uint16_t *pnum_bytes, uint8_t **pbytes)
653 struct cli_request *cli_req = talloc_get_type_abort(
654 req->private_data, struct cli_request);
657 size_t wct_ofs, bytes_offset;
661 for (i = 0; i < cli_req->num_async; i++) {
662 if (req == cli_req->async[i]) {
667 if (i == cli_req->num_async) {
668 cli_set_error(cli_req->cli, NT_STATUS_INVALID_PARAMETER);
669 return NT_STATUS_INVALID_PARAMETER;
673 * The status we pull here is only relevant for the last reply in the
677 status = cli_pull_error(cli_req->inbuf);
680 if (NT_STATUS_IS_ERR(status)
681 && !have_andx_command(cli_req->inbuf, smb_wct)) {
682 cli_set_error(cli_req->cli, status);
689 cmd = CVAL(cli_req->inbuf, smb_com);
692 for (j = 0; j < i; j++) {
695 return NT_STATUS_REQUEST_ABORTED;
697 if (!is_andx_req(cmd)) {
698 return NT_STATUS_INVALID_NETWORK_RESPONSE;
702 if (!have_andx_command(cli_req->inbuf, wct_ofs)) {
704 * This request was not completed because a previous
705 * request in the chain had received an error.
707 return NT_STATUS_REQUEST_ABORTED;
710 wct_ofs = SVAL(cli_req->inbuf, wct_ofs + 3);
713 * Skip the all-present length field. No overflow, we've just
714 * put a 16-bit value into a size_t.
718 if (wct_ofs+2 > talloc_get_size(cli_req->inbuf)) {
719 return NT_STATUS_INVALID_NETWORK_RESPONSE;
722 cmd = CVAL(cli_req->inbuf, wct_ofs + 1);
725 if (!have_andx_command(cli_req->inbuf, wct_ofs)
726 && NT_STATUS_IS_ERR(status)) {
728 * The last command takes the error code. All further commands
729 * down the requested chain will get a
730 * NT_STATUS_REQUEST_ABORTED.
736 wct = CVAL(cli_req->inbuf, wct_ofs);
738 bytes_offset = wct_ofs + 1 + wct * sizeof(uint16_t);
739 num_bytes = SVAL(cli_req->inbuf, bytes_offset);
742 * wct_ofs is a 16-bit value plus 4, wct is a 8-bit value, num_bytes
743 * is a 16-bit value. So bytes_offset being size_t should be far from
747 if ((bytes_offset + 2 > talloc_get_size(cli_req->inbuf))
748 || (bytes_offset > 0xffff)) {
749 return NT_STATUS_INVALID_NETWORK_RESPONSE;
753 *pvwv = (uint16_t *)(cli_req->inbuf + wct_ofs + 1);
754 *pnum_bytes = num_bytes;
755 *pbytes = (uint8_t *)cli_req->inbuf + bytes_offset + 2;
761 * Decrypt a PDU, check the signature
762 * @param[in] cli The cli_state that received something
763 * @param[in] pdu The incoming bytes
768 static NTSTATUS validate_smb_crypto(struct cli_state *cli, char *pdu)
772 if ((IVAL(pdu, 4) != 0x424d53ff) /* 0xFF"SMB" */
773 && (SVAL(pdu, 4) != 0x45ff)) /* 0xFF"E" */ {
774 DEBUG(10, ("Got non-SMB PDU\n"));
775 return NT_STATUS_INVALID_NETWORK_RESPONSE;
778 if (cli_encryption_on(cli) && CVAL(pdu, 0) == 0) {
779 uint16_t enc_ctx_num;
781 status = get_enc_ctx_num((uint8_t *)pdu, &enc_ctx_num);
782 if (!NT_STATUS_IS_OK(status)) {
783 DEBUG(10, ("get_enc_ctx_num returned %s\n",
788 if (enc_ctx_num != cli->trans_enc_state->enc_ctx_num) {
789 DEBUG(10, ("wrong enc_ctx %d, expected %d\n",
791 cli->trans_enc_state->enc_ctx_num));
792 return NT_STATUS_INVALID_HANDLE;
795 status = common_decrypt_buffer(cli->trans_enc_state, pdu);
796 if (!NT_STATUS_IS_OK(status)) {
797 DEBUG(10, ("common_decrypt_buffer returned %s\n",
803 if (!cli_check_sign_mac(cli, pdu)) {
804 DEBUG(10, ("cli_check_sign_mac failed\n"));
805 return NT_STATUS_ACCESS_DENIED;
812 * A PDU has arrived on cli->evt_inbuf
813 * @param[in] cli The cli_state that received something
816 static void handle_incoming_pdu(struct cli_state *cli)
818 struct cli_request *req;
820 size_t raw_pdu_len, buf_len, pdu_len, rest_len;
828 * The encrypted PDU len might differ from the unencrypted one
830 raw_pdu_len = smb_len(cli->evt_inbuf) + 4;
831 buf_len = talloc_get_size(cli->evt_inbuf);
832 rest_len = buf_len - raw_pdu_len;
834 if (buf_len == raw_pdu_len) {
836 * Optimal case: Exactly one PDU was in the socket buffer
838 pdu = cli->evt_inbuf;
839 cli->evt_inbuf = NULL;
842 DEBUG(11, ("buf_len = %d, raw_pdu_len = %d, splitting "
843 "buffer\n", (int)buf_len, (int)raw_pdu_len));
845 if (raw_pdu_len < rest_len) {
847 * The PDU is shorter, talloc_memdup that one.
849 pdu = (char *)talloc_memdup(
850 cli, cli->evt_inbuf, raw_pdu_len);
852 memmove(cli->evt_inbuf, cli->evt_inbuf + raw_pdu_len,
853 buf_len - raw_pdu_len);
855 cli->evt_inbuf = TALLOC_REALLOC_ARRAY(
856 NULL, cli->evt_inbuf, char, rest_len);
859 status = NT_STATUS_NO_MEMORY;
860 goto invalidate_requests;
865 * The PDU is larger than the rest, talloc_memdup the
868 pdu = cli->evt_inbuf;
870 cli->evt_inbuf = (char *)talloc_memdup(
871 cli, pdu + raw_pdu_len, rest_len);
873 if (cli->evt_inbuf == NULL) {
874 status = NT_STATUS_NO_MEMORY;
875 goto invalidate_requests;
880 status = validate_smb_crypto(cli, pdu);
881 if (!NT_STATUS_IS_OK(status)) {
882 goto invalidate_requests;
885 mid = SVAL(pdu, smb_mid);
887 DEBUG(10, ("handle_incoming_pdu: got mid %d\n", mid));
889 for (req = cli->outstanding_requests; req; req = req->next) {
890 if (req->mid == mid) {
895 pdu_len = smb_len(pdu) + 4;
898 DEBUG(3, ("Request for mid %d not found, dumping PDU\n", mid));
904 req->inbuf = talloc_move(req, &pdu);
907 * Freeing the last async_req will free the req (see
908 * cli_async_req_destructor). So make a copy of req->num_async, we
909 * can't reference it in the last round.
912 num_async = req->num_async;
914 for (i=0; i<num_async; i++) {
916 * A request might have been talloc_free()'ed before we arrive
917 * here. It will have removed itself from req->async via its
918 * destructor cli_async_req_destructor().
920 if (req->async[i] != NULL) {
921 if (req->recv_helper.fn != NULL) {
922 req->recv_helper.fn(req->async[i]);
924 async_req_done(req->async[i]);
932 DEBUG(10, ("handle_incoming_pdu: Aborting with %s\n",
935 for (req = cli->outstanding_requests; req; req = req->next) {
936 async_req_error(req->async[0], status);
942 * fd event callback. This is the basic connection to the socket
943 * @param[in] event_ctx The event context that called us
944 * @param[in] event The event that fired
945 * @param[in] flags EVENT_FD_READ | EVENT_FD_WRITE
946 * @param[in] p private_data, in this case the cli_state
949 static void cli_state_handler(struct event_context *event_ctx,
950 struct fd_event *event, uint16 flags, void *p)
952 struct cli_state *cli = (struct cli_state *)p;
953 struct cli_request *req;
956 DEBUG(11, ("cli_state_handler called with flags %d\n", flags));
958 if (flags & EVENT_FD_WRITE) {
962 for (req = cli->outstanding_requests; req; req = req->next) {
963 to_send = smb_len(req->outbuf)+4;
964 if (to_send > req->sent) {
970 if (cli->fd_event != NULL) {
971 event_fd_set_not_writeable(cli->fd_event);
976 sent = sys_send(cli->fd, req->outbuf + req->sent,
977 to_send - req->sent, 0);
980 status = map_nt_error_from_unix(errno);
986 if (req->sent == to_send) {
991 if (flags & EVENT_FD_READ) {
993 size_t old_size, new_size;
996 res = ioctl(cli->fd, FIONREAD, &available);
998 DEBUG(10, ("ioctl(FIONREAD) failed: %s\n",
1000 status = map_nt_error_from_unix(errno);
1004 if (available == 0) {
1006 status = NT_STATUS_END_OF_FILE;
1010 old_size = talloc_get_size(cli->evt_inbuf);
1011 new_size = old_size + available;
1013 if (new_size < old_size) {
1015 status = NT_STATUS_UNEXPECTED_IO_ERROR;
1019 tmp = TALLOC_REALLOC_ARRAY(cli, cli->evt_inbuf, char,
1023 status = NT_STATUS_NO_MEMORY;
1026 cli->evt_inbuf = tmp;
1028 res = sys_recv(cli->fd, cli->evt_inbuf + old_size, available, 0);
1030 DEBUG(10, ("recv failed: %s\n", strerror(errno)));
1031 status = map_nt_error_from_unix(errno);
1035 DEBUG(11, ("cli_state_handler: received %d bytes, "
1036 "smb_len(evt_inbuf) = %d\n", (int)res,
1037 smb_len(cli->evt_inbuf)));
1039 /* recv *might* have returned less than announced */
1040 new_size = old_size + res;
1042 /* shrink, so I don't expect errors here */
1043 cli->evt_inbuf = TALLOC_REALLOC_ARRAY(cli, cli->evt_inbuf,
1046 while ((cli->evt_inbuf != NULL)
1047 && ((smb_len(cli->evt_inbuf) + 4) <= new_size)) {
1049 * we've got a complete NBT level PDU in evt_inbuf
1051 handle_incoming_pdu(cli);
1052 new_size = talloc_get_size(cli->evt_inbuf);
1059 for (req = cli->outstanding_requests; req; req = req->next) {
1061 for (i=0; i<req->num_async; i++) {
1062 async_req_error(req->async[i], status);
1065 TALLOC_FREE(cli->fd_event);