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, (char *)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(uint8_t *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(uint8_t **poutbuf, uint8_t smb_command,
235 uint8_t wct, const uint16_t *vwv,
236 size_t bytes_alignment,
237 uint32_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 ((smb_command != SMBwriteX) && (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, uint8_t, 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, uint8_t, 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);
314 * Push the chained request:
319 SCVAL(outbuf, ofs, wct);
326 memcpy(outbuf + ofs, vwv, sizeof(uint16_t) * wct);
327 ofs += sizeof(uint16_t) * wct;
333 SSVAL(outbuf, ofs, num_bytes + bytes_padding);
334 ofs += sizeof(uint16_t);
340 if (bytes_padding != 0) {
341 memset(outbuf + ofs, 0, bytes_padding);
342 ofs += bytes_padding;
349 memcpy(outbuf + ofs, bytes, num_bytes);
355 * @brief Destroy an async_req that is the visible part of a cli_request
356 * @param[in] req The request to kill
357 * @retval Return 0 to make talloc happy
359 * This destructor is a bit tricky: Because a cli_request can host more than
360 * one async_req for chained requests, we need to make sure that the
361 * "cli_request" that we were part of is correctly destroyed at the right
362 * time. This is done by NULLing out ourself from the "async" member of our
363 * "cli_request". If there is none left, then also TALLOC_FREE() the
364 * cli_request, which was a talloc child of the client connection cli_state.
367 static int cli_async_req_destructor(struct async_req *req)
369 struct cli_request *cli_req = talloc_get_type_abort(
370 req->private_data, struct cli_request);
376 for (i=0; i<cli_req->num_async; i++) {
377 if (cli_req->async[i] == req) {
378 cli_req->async[i] = NULL;
381 if (cli_req->async[i] != NULL) {
389 TALLOC_FREE(cli_req);
396 * @brief Chain up a request
397 * @param[in] mem_ctx The TALLOC_CTX for the result
398 * @param[in] ev The event context that will call us back
399 * @param[in] cli The cli_state we queue the request up for
400 * @param[in] smb_command The command that we want to issue
401 * @param[in] additional_flags open_and_x wants to add oplock header flags
402 * @param[in] wct How many words?
403 * @param[in] vwv The words, already in network order
404 * @param[in] bytes_alignment How shall we align "bytes"?
405 * @param[in] num_bytes How many bytes?
406 * @param[in] bytes The data the request ships
408 * cli_request_chain() is the core of the SMB request marshalling routine. It
409 * will create a new async_req structure in the cli->chain_accumulator->async
410 * array and marshall the smb_cmd, the vwv array and the bytes into
411 * cli->chain_accumulator->outbuf.
414 static struct async_req *cli_request_chain(TALLOC_CTX *mem_ctx,
415 struct event_context *ev,
416 struct cli_state *cli,
418 uint8_t additional_flags,
419 uint8_t wct, const uint16_t *vwv,
420 size_t bytes_alignment,
422 const uint8_t *bytes)
424 struct async_req **tmp_reqs;
425 struct cli_request *req;
427 req = cli->chain_accumulator;
429 tmp_reqs = TALLOC_REALLOC_ARRAY(req, req->async, struct async_req *,
431 if (tmp_reqs == NULL) {
432 DEBUG(0, ("talloc failed\n"));
435 req->async = tmp_reqs;
438 req->async[req->num_async-1] = async_req_new(mem_ctx);
439 if (req->async[req->num_async-1] == NULL) {
440 DEBUG(0, ("async_req_new failed\n"));
444 req->async[req->num_async-1]->private_data = req;
445 req->async[req->num_async-1]->print = cli_request_print;
446 talloc_set_destructor(req->async[req->num_async-1],
447 cli_async_req_destructor);
449 if (!smb_splice_chain(&req->outbuf, smb_command, wct, vwv,
450 bytes_alignment, num_bytes, bytes)) {
454 return req->async[req->num_async-1];
457 TALLOC_FREE(req->async[req->num_async-1]);
463 * @brief prepare a cli_state to accept a chain of requests
464 * @param[in] cli The cli_state we want to queue up in
465 * @param[in] ev The event_context that will call us back for the socket
466 * @param[in] size_hint How many bytes are expected, just an optimization
467 * @retval Did we have enough memory?
469 * cli_chain_cork() sets up a new cli_request in cli->chain_accumulator. If
470 * cli is used in an async fashion, i.e. if we have outstanding requests, then
471 * we do not have to create a fd event. If cli is used only with the sync
472 * helpers, we need to create the fd_event here.
474 * If you want to issue a chained request to the server, do a
475 * cli_chain_cork(), then do you cli_open_send(), cli_read_and_x_send(),
476 * cli_close_send() and so on. The async requests that come out of
477 * cli_xxx_send() are normal async requests with the difference that they
478 * won't be shipped individually. But the event_context will still trigger the
479 * req->async.fn to be called on every single request.
481 * You have to take care yourself that you only issue chainable requests in
482 * the middle of the chain.
485 bool cli_chain_cork(struct cli_state *cli, struct event_context *ev,
488 struct cli_request *req = NULL;
490 SMB_ASSERT(cli->chain_accumulator == NULL);
493 DEBUG(10, ("cli->fd closed\n"));
497 if (cli->fd_event == NULL) {
498 SMB_ASSERT(cli->outstanding_requests == NULL);
499 cli->fd_event = event_add_fd(ev, cli, cli->fd,
501 cli_state_handler, cli);
502 if (cli->fd_event == NULL) {
507 req = talloc(cli, struct cli_request);
513 if (size_hint == 0) {
516 req->outbuf = talloc_array(req, uint8_t, smb_wct + size_hint);
517 if (req->outbuf == NULL) {
520 req->outbuf = TALLOC_REALLOC_ARRAY(NULL, req->outbuf, uint8_t,
526 req->enc_state = NULL;
527 req->recv_helper.fn = NULL;
529 SSVAL(req->outbuf, smb_tid, cli->cnum);
530 cli_setup_packet_buf(cli, (char *)req->outbuf);
532 req->mid = cli_new_mid(cli);
534 cli->chain_accumulator = req;
536 DEBUG(10, ("cli_chain_cork: mid=%d\n", req->mid));
541 if (cli->outstanding_requests == NULL) {
542 TALLOC_FREE(cli->fd_event);
548 * Ship a request queued up via cli_request_chain()
549 * @param[in] cl The connection
552 void cli_chain_uncork(struct cli_state *cli)
554 struct cli_request *req = cli->chain_accumulator;
557 SMB_ASSERT(req != NULL);
559 DLIST_ADD_END(cli->outstanding_requests, req, struct cli_request *);
560 talloc_set_destructor(req, cli_request_destructor);
562 cli->chain_accumulator = NULL;
564 SSVAL(req->outbuf, smb_mid, req->mid);
566 smblen = talloc_get_size(req->outbuf) - 4;
568 smb_setlen((char *)req->outbuf, smblen);
570 if (smblen > 0x1ffff) {
572 * This is a POSIX 14 word large write. Overwrite just the
573 * size field, the '0xFFSMB' has been set by smb_setlen which
574 * _smb_setlen_large does not do.
576 _smb_setlen_large(((char *)req->outbuf), smblen);
579 cli_calculate_sign_mac(cli, (char *)req->outbuf);
581 if (cli_encryption_on(cli)) {
585 status = cli_encrypt_message(cli, (char *)req->outbuf,
587 if (!NT_STATUS_IS_OK(status)) {
588 DEBUG(0, ("Error in encrypting client message. "
589 "Error %s\n", nt_errstr(status)));
593 req->outbuf = (uint8_t *)enc_buf;
594 req->enc_state = cli->trans_enc_state;
599 event_fd_set_writeable(cli->fd_event);
603 * @brief Send a request to the server
604 * @param[in] mem_ctx The TALLOC_CTX for the result
605 * @param[in] ev The event context that will call us back
606 * @param[in] cli The cli_state we queue the request up for
607 * @param[in] smb_command The command that we want to issue
608 * @param[in] additional_flags open_and_x wants to add oplock header flags
609 * @param[in] wct How many words?
610 * @param[in] vwv The words, already in network order
611 * @param[in] bytes_alignment How shall we align "bytes"?
612 * @param[in] num_bytes How many bytes?
613 * @param[in] bytes The data the request ships
615 * This is the generic routine to be used by the cli_xxx_send routines.
618 struct async_req *cli_request_send(TALLOC_CTX *mem_ctx,
619 struct event_context *ev,
620 struct cli_state *cli,
622 uint8_t additional_flags,
623 uint8_t wct, const uint16_t *vwv,
624 size_t bytes_alignment,
625 uint32_t num_bytes, const uint8_t *bytes)
627 struct async_req *result;
630 if (cli->chain_accumulator == NULL) {
631 if (!cli_chain_cork(cli, ev,
632 wct * sizeof(uint16_t) + num_bytes + 3)) {
633 DEBUG(1, ("cli_chain_cork failed\n"));
639 result = cli_request_chain(mem_ctx, ev, cli, smb_command,
640 additional_flags, wct, vwv, bytes_alignment,
643 if (result == NULL) {
644 DEBUG(1, ("cli_request_chain failed\n"));
648 cli_chain_uncork(cli);
655 * Calculate the current ofs to wct for requests like write&x
656 * @param[in] req The smb request we're currently building
657 * @retval how many bytes offset have we accumulated?
660 uint16_t cli_wct_ofs(const struct cli_state *cli)
664 if (cli->chain_accumulator == NULL) {
668 buf_size = talloc_get_size(cli->chain_accumulator->outbuf);
670 if (buf_size == smb_wct) {
675 * Add alignment for subsequent requests
678 if ((buf_size % 4) != 0) {
679 buf_size += (4 - (buf_size % 4));
686 * Figure out if there is an andx command behind the current one
687 * @param[in] buf The smb buffer to look at
688 * @param[in] ofs The offset to the wct field that is followed by the cmd
689 * @retval Is there a command following?
692 static bool have_andx_command(const char *buf, uint16_t ofs)
695 size_t buflen = talloc_get_size(buf);
697 if ((ofs == buflen-1) || (ofs == buflen)) {
701 wct = CVAL(buf, ofs);
704 * Not enough space for the command and a following pointer
708 return (CVAL(buf, ofs+1) != 0xff);
712 * @brief Pull reply data out of a request
713 * @param[in] req The request that we just received a reply for
714 * @param[out] pwct How many words did the server send?
715 * @param[out] pvwv The words themselves
716 * @param[out] pnum_bytes How many bytes did the server send?
717 * @param[out] pbytes The bytes themselves
718 * @retval Was the reply formally correct?
721 NTSTATUS cli_pull_reply(struct async_req *req,
722 uint8_t *pwct, uint16_t **pvwv,
723 uint16_t *pnum_bytes, uint8_t **pbytes)
725 struct cli_request *cli_req = talloc_get_type_abort(
726 req->private_data, struct cli_request);
729 size_t wct_ofs, bytes_offset;
733 for (i = 0; i < cli_req->num_async; i++) {
734 if (req == cli_req->async[i]) {
739 if (i == cli_req->num_async) {
740 cli_set_error(cli_req->cli, NT_STATUS_INVALID_PARAMETER);
741 return NT_STATUS_INVALID_PARAMETER;
745 * The status we pull here is only relevant for the last reply in the
749 status = cli_pull_error(cli_req->inbuf);
752 if (NT_STATUS_IS_ERR(status)
753 && !have_andx_command(cli_req->inbuf, smb_wct)) {
754 cli_set_error(cli_req->cli, status);
761 cmd = CVAL(cli_req->inbuf, smb_com);
764 for (j = 0; j < i; j++) {
767 return NT_STATUS_REQUEST_ABORTED;
769 if (!is_andx_req(cmd)) {
770 return NT_STATUS_INVALID_NETWORK_RESPONSE;
774 if (!have_andx_command(cli_req->inbuf, wct_ofs)) {
776 * This request was not completed because a previous
777 * request in the chain had received an error.
779 return NT_STATUS_REQUEST_ABORTED;
782 wct_ofs = SVAL(cli_req->inbuf, wct_ofs + 3);
785 * Skip the all-present length field. No overflow, we've just
786 * put a 16-bit value into a size_t.
790 if (wct_ofs+2 > talloc_get_size(cli_req->inbuf)) {
791 return NT_STATUS_INVALID_NETWORK_RESPONSE;
794 cmd = CVAL(cli_req->inbuf, wct_ofs + 1);
797 if (!have_andx_command(cli_req->inbuf, wct_ofs)
798 && NT_STATUS_IS_ERR(status)) {
800 * The last command takes the error code. All further commands
801 * down the requested chain will get a
802 * NT_STATUS_REQUEST_ABORTED.
808 wct = CVAL(cli_req->inbuf, wct_ofs);
810 bytes_offset = wct_ofs + 1 + wct * sizeof(uint16_t);
811 num_bytes = SVAL(cli_req->inbuf, bytes_offset);
814 * wct_ofs is a 16-bit value plus 4, wct is a 8-bit value, num_bytes
815 * is a 16-bit value. So bytes_offset being size_t should be far from
819 if ((bytes_offset + 2 > talloc_get_size(cli_req->inbuf))
820 || (bytes_offset > 0xffff)) {
821 return NT_STATUS_INVALID_NETWORK_RESPONSE;
825 *pvwv = (uint16_t *)(cli_req->inbuf + wct_ofs + 1);
826 *pnum_bytes = num_bytes;
827 *pbytes = (uint8_t *)cli_req->inbuf + bytes_offset + 2;
833 * Decrypt a PDU, check the signature
834 * @param[in] cli The cli_state that received something
835 * @param[in] pdu The incoming bytes
840 static NTSTATUS validate_smb_crypto(struct cli_state *cli, char *pdu)
844 if ((IVAL(pdu, 4) != 0x424d53ff) /* 0xFF"SMB" */
845 && (SVAL(pdu, 4) != 0x45ff)) /* 0xFF"E" */ {
846 DEBUG(10, ("Got non-SMB PDU\n"));
847 return NT_STATUS_INVALID_NETWORK_RESPONSE;
850 if (cli_encryption_on(cli) && CVAL(pdu, 0) == 0) {
851 uint16_t enc_ctx_num;
853 status = get_enc_ctx_num((uint8_t *)pdu, &enc_ctx_num);
854 if (!NT_STATUS_IS_OK(status)) {
855 DEBUG(10, ("get_enc_ctx_num returned %s\n",
860 if (enc_ctx_num != cli->trans_enc_state->enc_ctx_num) {
861 DEBUG(10, ("wrong enc_ctx %d, expected %d\n",
863 cli->trans_enc_state->enc_ctx_num));
864 return NT_STATUS_INVALID_HANDLE;
867 status = common_decrypt_buffer(cli->trans_enc_state, pdu);
868 if (!NT_STATUS_IS_OK(status)) {
869 DEBUG(10, ("common_decrypt_buffer returned %s\n",
875 if (!cli_check_sign_mac(cli, pdu)) {
876 DEBUG(10, ("cli_check_sign_mac failed\n"));
877 return NT_STATUS_ACCESS_DENIED;
884 * A PDU has arrived on cli->evt_inbuf
885 * @param[in] cli The cli_state that received something
888 static void handle_incoming_pdu(struct cli_state *cli)
890 struct cli_request *req;
892 size_t raw_pdu_len, buf_len, pdu_len, rest_len;
900 * The encrypted PDU len might differ from the unencrypted one
902 raw_pdu_len = smb_len(cli->evt_inbuf) + 4;
903 buf_len = talloc_get_size(cli->evt_inbuf);
904 rest_len = buf_len - raw_pdu_len;
906 if (buf_len == raw_pdu_len) {
908 * Optimal case: Exactly one PDU was in the socket buffer
910 pdu = cli->evt_inbuf;
911 cli->evt_inbuf = NULL;
914 DEBUG(11, ("buf_len = %d, raw_pdu_len = %d, splitting "
915 "buffer\n", (int)buf_len, (int)raw_pdu_len));
917 if (raw_pdu_len < rest_len) {
919 * The PDU is shorter, talloc_memdup that one.
921 pdu = (char *)talloc_memdup(
922 cli, cli->evt_inbuf, raw_pdu_len);
924 memmove(cli->evt_inbuf, cli->evt_inbuf + raw_pdu_len,
925 buf_len - raw_pdu_len);
927 cli->evt_inbuf = TALLOC_REALLOC_ARRAY(
928 NULL, cli->evt_inbuf, char, rest_len);
931 status = NT_STATUS_NO_MEMORY;
932 goto invalidate_requests;
937 * The PDU is larger than the rest, talloc_memdup the
940 pdu = cli->evt_inbuf;
942 cli->evt_inbuf = (char *)talloc_memdup(
943 cli, pdu + raw_pdu_len, rest_len);
945 if (cli->evt_inbuf == NULL) {
946 status = NT_STATUS_NO_MEMORY;
947 goto invalidate_requests;
952 status = validate_smb_crypto(cli, pdu);
953 if (!NT_STATUS_IS_OK(status)) {
954 goto invalidate_requests;
957 mid = SVAL(pdu, smb_mid);
959 DEBUG(10, ("handle_incoming_pdu: got mid %d\n", mid));
961 for (req = cli->outstanding_requests; req; req = req->next) {
962 if (req->mid == mid) {
967 pdu_len = smb_len(pdu) + 4;
970 DEBUG(3, ("Request for mid %d not found, dumping PDU\n", mid));
976 req->inbuf = talloc_move(req, &pdu);
979 * Freeing the last async_req will free the req (see
980 * cli_async_req_destructor). So make a copy of req->num_async, we
981 * can't reference it in the last round.
984 num_async = req->num_async;
986 for (i=0; i<num_async; i++) {
988 * A request might have been talloc_free()'ed before we arrive
989 * here. It will have removed itself from req->async via its
990 * destructor cli_async_req_destructor().
992 if (req->async[i] != NULL) {
993 if (req->recv_helper.fn != NULL) {
994 req->recv_helper.fn(req->async[i]);
996 async_req_done(req->async[i]);
1002 invalidate_requests:
1004 DEBUG(10, ("handle_incoming_pdu: Aborting with %s\n",
1005 nt_errstr(status)));
1007 for (req = cli->outstanding_requests; req; req = req->next) {
1008 async_req_error(req->async[0], status);
1014 * fd event callback. This is the basic connection to the socket
1015 * @param[in] event_ctx The event context that called us
1016 * @param[in] event The event that fired
1017 * @param[in] flags EVENT_FD_READ | EVENT_FD_WRITE
1018 * @param[in] p private_data, in this case the cli_state
1021 static void cli_state_handler(struct event_context *event_ctx,
1022 struct fd_event *event, uint16 flags, void *p)
1024 struct cli_state *cli = (struct cli_state *)p;
1025 struct cli_request *req, *next;
1028 DEBUG(11, ("cli_state_handler called with flags %d\n", flags));
1030 if (flags & EVENT_FD_WRITE) {
1034 for (req = cli->outstanding_requests; req; req = req->next) {
1035 to_send = smb_len(req->outbuf)+4;
1036 if (to_send > req->sent) {
1042 if (cli->fd_event != NULL) {
1043 event_fd_set_not_writeable(cli->fd_event);
1048 sent = sys_send(cli->fd, req->outbuf + req->sent,
1049 to_send - req->sent, 0);
1052 status = map_nt_error_from_unix(errno);
1058 if (req->sent == to_send) {
1063 if (flags & EVENT_FD_READ) {
1065 size_t old_size, new_size;
1068 res = ioctl(cli->fd, FIONREAD, &available);
1070 DEBUG(10, ("ioctl(FIONREAD) failed: %s\n",
1072 status = map_nt_error_from_unix(errno);
1076 if (available == 0) {
1078 status = NT_STATUS_END_OF_FILE;
1082 old_size = talloc_get_size(cli->evt_inbuf);
1083 new_size = old_size + available;
1085 if (new_size < old_size) {
1087 status = NT_STATUS_UNEXPECTED_IO_ERROR;
1091 tmp = TALLOC_REALLOC_ARRAY(cli, cli->evt_inbuf, char,
1095 status = NT_STATUS_NO_MEMORY;
1098 cli->evt_inbuf = tmp;
1100 res = sys_recv(cli->fd, cli->evt_inbuf + old_size, available, 0);
1102 DEBUG(10, ("recv failed: %s\n", strerror(errno)));
1103 status = map_nt_error_from_unix(errno);
1107 DEBUG(11, ("cli_state_handler: received %d bytes, "
1108 "smb_len(evt_inbuf) = %d\n", (int)res,
1109 smb_len(cli->evt_inbuf)));
1111 /* recv *might* have returned less than announced */
1112 new_size = old_size + res;
1114 /* shrink, so I don't expect errors here */
1115 cli->evt_inbuf = TALLOC_REALLOC_ARRAY(cli, cli->evt_inbuf,
1118 while ((cli->evt_inbuf != NULL)
1119 && ((smb_len(cli->evt_inbuf) + 4) <= new_size)) {
1121 * we've got a complete NBT level PDU in evt_inbuf
1123 handle_incoming_pdu(cli);
1124 new_size = talloc_get_size(cli->evt_inbuf);
1132 for (req = cli->outstanding_requests; req; req = next) {
1136 num_async = req->num_async;
1138 for (i=0; i<num_async; i++) {
1139 async_req_error(req->async[i], status);
1142 TALLOC_FREE(cli->fd_event);