2 Unix SMB/CIFS implementation.
3 process incoming packets - main loop
4 Copyright (C) Andrew Tridgell 1992-1998
5 Copyright (C) Volker Lendecke 2005-2007
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 3 of the License, or
10 (at your option) any later version.
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with this program. If not, see <http://www.gnu.org/licenses/>.
23 extern int smb_echo_count
;
26 * Size of data we can send to client. Set
27 * by the client for all protocols above CORE.
28 * Set by us for CORE protocol.
30 int max_send
= BUFFER_SIZE
;
32 * Size of the data we can receive. Set by us.
33 * Can be modified by the max xmit parameter.
35 int max_recv
= BUFFER_SIZE
;
37 SIG_ATOMIC_T reload_after_sighup
= 0;
38 SIG_ATOMIC_T got_sig_term
= 0;
39 extern bool global_machine_password_needs_changing
;
42 /* Accessor function for smb_read_error for smbd functions. */
44 /****************************************************************************
46 ****************************************************************************/
48 bool srv_send_smb(int fd
, char *buffer
, bool do_encrypt
)
53 char *buf_out
= buffer
;
55 /* Sign the outgoing packet if required. */
56 srv_calculate_sign_mac(buf_out
);
59 NTSTATUS status
= srv_encrypt_buffer(buffer
, &buf_out
);
60 if (!NT_STATUS_IS_OK(status
)) {
61 DEBUG(0, ("send_smb: SMB encryption failed "
62 "on outgoing packet! Error %s\n",
68 len
= smb_len(buf_out
) + 4;
70 while (nwritten
< len
) {
71 ret
= write_data(fd
,buf_out
+nwritten
,len
- nwritten
);
73 DEBUG(0,("Error writing %d bytes to client. %d. (%s)\n",
74 (int)len
,(int)ret
, strerror(errno
) ));
75 srv_free_enc_buffer(buf_out
);
81 srv_free_enc_buffer(buf_out
);
85 /*******************************************************************
86 Setup the word count and byte count for a smb message.
87 ********************************************************************/
89 int srv_set_message(char *buf
,
94 if (zero
&& (num_words
|| num_bytes
)) {
95 memset(buf
+ smb_size
,'\0',num_words
*2 + num_bytes
);
97 SCVAL(buf
,smb_wct
,num_words
);
98 SSVAL(buf
,smb_vwv
+ num_words
*SIZEOFWORD
,num_bytes
);
99 smb_setlen(buf
,(smb_size
+ num_words
*2 + num_bytes
- 4));
100 return (smb_size
+ num_words
*2 + num_bytes
);
103 static bool valid_smb_header(const uint8_t *inbuf
)
105 if (is_encrypted_packet(inbuf
)) {
109 * This used to be (strncmp(smb_base(inbuf),"\377SMB",4) == 0)
110 * but it just looks weird to call strncmp for this one.
112 return (IVAL(smb_base(inbuf
), 0) == 0x424D53FF);
115 /* Socket functions for smbd packet processing. */
117 static bool valid_packet_size(size_t len
)
120 * A WRITEX with CAP_LARGE_WRITEX can be 64k worth of data plus 65 bytes
121 * of header. Don't print the error if this fits.... JRA.
124 if (len
> (BUFFER_SIZE
+ LARGE_WRITEX_HDR_SIZE
)) {
125 DEBUG(0,("Invalid packet length! (%lu bytes).\n",
126 (unsigned long)len
));
132 static NTSTATUS
read_packet_remainder(int fd
, char *buffer
,
133 unsigned int timeout
, ssize_t len
)
139 return read_socket_with_timeout(fd
, buffer
, len
, len
, timeout
, NULL
);
142 /****************************************************************************
143 Attempt a zerocopy writeX read. We know here that len > smb_size-4
144 ****************************************************************************/
147 * Unfortunately, earlier versions of smbclient/libsmbclient
148 * don't send this "standard" writeX header. I've fixed this
149 * for 3.2 but we'll use the old method with earlier versions.
150 * Windows and CIFSFS at least use this standard size. Not
154 #define STANDARD_WRITE_AND_X_HEADER_SIZE (smb_size - 4 + /* basic header */ \
155 (2*14) + /* word count (including bcc) */ \
158 static NTSTATUS
receive_smb_raw_talloc_partial_read(TALLOC_CTX
*mem_ctx
,
160 int fd
, char **buffer
,
161 unsigned int timeout
,
165 /* Size of a WRITEX call (+4 byte len). */
166 char writeX_header
[4 + STANDARD_WRITE_AND_X_HEADER_SIZE
];
167 ssize_t len
= smb_len_large(lenbuf
); /* Could be a UNIX large writeX. */
171 memcpy(writeX_header
, lenbuf
, 4);
173 status
= read_socket_with_timeout(
174 fd
, writeX_header
+ 4,
175 STANDARD_WRITE_AND_X_HEADER_SIZE
,
176 STANDARD_WRITE_AND_X_HEADER_SIZE
,
179 if (!NT_STATUS_IS_OK(status
)) {
184 * Ok - now try and see if this is a possible
188 if (is_valid_writeX_buffer((uint8_t *)writeX_header
)) {
190 * If the data offset is beyond what
191 * we've read, drain the extra bytes.
193 uint16_t doff
= SVAL(writeX_header
,smb_vwv11
);
196 if (doff
> STANDARD_WRITE_AND_X_HEADER_SIZE
) {
197 size_t drain
= doff
- STANDARD_WRITE_AND_X_HEADER_SIZE
;
198 if (drain_socket(smbd_server_fd(), drain
) != drain
) {
199 smb_panic("receive_smb_raw_talloc_partial_read:"
200 " failed to drain pending bytes");
203 doff
= STANDARD_WRITE_AND_X_HEADER_SIZE
;
206 /* Spoof down the length and null out the bcc. */
207 set_message_bcc(writeX_header
, 0);
208 newlen
= smb_len(writeX_header
);
210 /* Copy the header we've written. */
212 *buffer
= (char *)TALLOC_MEMDUP(mem_ctx
,
214 sizeof(writeX_header
));
216 if (*buffer
== NULL
) {
217 DEBUG(0, ("Could not allocate inbuf of length %d\n",
218 (int)sizeof(writeX_header
)));
219 return NT_STATUS_NO_MEMORY
;
222 /* Work out the remaining bytes. */
223 *p_unread
= len
- STANDARD_WRITE_AND_X_HEADER_SIZE
;
224 *len_ret
= newlen
+ 4;
228 if (!valid_packet_size(len
)) {
229 return NT_STATUS_INVALID_PARAMETER
;
233 * Not a valid writeX call. Just do the standard
237 *buffer
= TALLOC_ARRAY(mem_ctx
, char, len
+4);
239 if (*buffer
== NULL
) {
240 DEBUG(0, ("Could not allocate inbuf of length %d\n",
242 return NT_STATUS_NO_MEMORY
;
245 /* Copy in what we already read. */
248 4 + STANDARD_WRITE_AND_X_HEADER_SIZE
);
249 toread
= len
- STANDARD_WRITE_AND_X_HEADER_SIZE
;
252 status
= read_packet_remainder(
253 fd
, (*buffer
) + 4 + STANDARD_WRITE_AND_X_HEADER_SIZE
,
256 if (!NT_STATUS_IS_OK(status
)) {
257 DEBUG(10, ("receive_smb_raw_talloc_partial_read: %s\n",
267 static NTSTATUS
receive_smb_raw_talloc(TALLOC_CTX
*mem_ctx
, int fd
,
268 char **buffer
, unsigned int timeout
,
269 size_t *p_unread
, size_t *plen
)
273 int min_recv_size
= lp_min_receive_file_size();
278 status
= read_smb_length_return_keepalive(fd
, lenbuf
, timeout
, &len
);
279 if (!NT_STATUS_IS_OK(status
)) {
280 DEBUG(10, ("receive_smb_raw: %s\n", nt_errstr(status
)));
284 if (CVAL(lenbuf
,0) == 0 &&
286 smb_len_large(lenbuf
) > (min_recv_size
+ STANDARD_WRITE_AND_X_HEADER_SIZE
) && /* Could be a UNIX large writeX. */
287 !srv_is_signing_active()) {
289 return receive_smb_raw_talloc_partial_read(
290 mem_ctx
, lenbuf
, fd
, buffer
, timeout
, p_unread
, plen
);
293 if (!valid_packet_size(len
)) {
294 return NT_STATUS_INVALID_PARAMETER
;
298 * The +4 here can't wrap, we've checked the length above already.
301 *buffer
= TALLOC_ARRAY(mem_ctx
, char, len
+4);
303 if (*buffer
== NULL
) {
304 DEBUG(0, ("Could not allocate inbuf of length %d\n",
306 return NT_STATUS_NO_MEMORY
;
309 memcpy(*buffer
, lenbuf
, sizeof(lenbuf
));
311 status
= read_packet_remainder(fd
, (*buffer
)+4, timeout
, len
);
312 if (!NT_STATUS_IS_OK(status
)) {
320 static NTSTATUS
receive_smb_talloc(TALLOC_CTX
*mem_ctx
, int fd
,
321 char **buffer
, unsigned int timeout
,
322 size_t *p_unread
, bool *p_encrypted
,
328 *p_encrypted
= false;
330 status
= receive_smb_raw_talloc(mem_ctx
, fd
, buffer
, timeout
,
332 if (!NT_STATUS_IS_OK(status
)) {
336 if (is_encrypted_packet((uint8_t *)*buffer
)) {
337 status
= srv_decrypt_buffer(*buffer
);
338 if (!NT_STATUS_IS_OK(status
)) {
339 DEBUG(0, ("receive_smb_talloc: SMB decryption failed on "
340 "incoming packet! Error %s\n",
341 nt_errstr(status
) ));
347 /* Check the incoming SMB signature. */
348 if (!srv_check_sign_mac(*buffer
, true)) {
349 DEBUG(0, ("receive_smb: SMB Signature verification failed on "
350 "incoming packet!\n"));
351 return NT_STATUS_INVALID_NETWORK_RESPONSE
;
359 * Initialize a struct smb_request from an inbuf
362 void init_smb_request(struct smb_request
*req
,
367 size_t req_size
= smb_len(inbuf
) + 4;
368 /* Ensure we have at least smb_size bytes. */
369 if (req_size
< smb_size
) {
370 DEBUG(0,("init_smb_request: invalid request size %u\n",
371 (unsigned int)req_size
));
372 exit_server_cleanly("Invalid SMB request");
374 req
->flags2
= SVAL(inbuf
, smb_flg2
);
375 req
->smbpid
= SVAL(inbuf
, smb_pid
);
376 req
->mid
= SVAL(inbuf
, smb_mid
);
377 req
->vuid
= SVAL(inbuf
, smb_uid
);
378 req
->tid
= SVAL(inbuf
, smb_tid
);
379 req
->wct
= CVAL(inbuf
, smb_wct
);
380 req
->unread_bytes
= unread_bytes
;
381 req
->encrypted
= encrypted
;
382 req
->conn
= conn_find(req
->tid
);
384 /* Ensure we have at least wct words and 2 bytes of bcc. */
385 if (smb_size
+ req
->wct
*2 > req_size
) {
386 DEBUG(0,("init_smb_request: invalid wct number %u (size %u)\n",
387 (unsigned int)req
->wct
,
388 (unsigned int)req_size
));
389 exit_server_cleanly("Invalid SMB request");
391 /* Ensure bcc is correct. */
392 if (((uint8
*)smb_buf(inbuf
)) + smb_buflen(inbuf
) > inbuf
+ req_size
) {
393 DEBUG(0,("init_smb_request: invalid bcc number %u "
394 "(wct = %u, size %u)\n",
395 (unsigned int)smb_buflen(inbuf
),
396 (unsigned int)req
->wct
,
397 (unsigned int)req_size
));
398 exit_server_cleanly("Invalid SMB request");
404 /****************************************************************************
405 structure to hold a linked list of queued messages.
407 ****************************************************************************/
409 static struct pending_message_list
*deferred_open_queue
;
411 /****************************************************************************
412 Function to push a message onto the tail of a linked list of smb messages ready
414 ****************************************************************************/
416 static bool push_queued_message(struct smb_request
*req
,
417 struct timeval request_time
,
418 struct timeval end_time
,
419 char *private_data
, size_t private_len
)
421 int msg_len
= smb_len(req
->inbuf
) + 4;
422 struct pending_message_list
*msg
;
424 msg
= TALLOC_ZERO_P(NULL
, struct pending_message_list
);
427 DEBUG(0,("push_message: malloc fail (1)\n"));
431 msg
->buf
= data_blob_talloc(msg
, req
->inbuf
, msg_len
);
432 if(msg
->buf
.data
== NULL
) {
433 DEBUG(0,("push_message: malloc fail (2)\n"));
438 msg
->request_time
= request_time
;
439 msg
->end_time
= end_time
;
440 msg
->encrypted
= req
->encrypted
;
441 msg
->processed
= false;
444 msg
->private_data
= data_blob_talloc(msg
, private_data
,
446 if (msg
->private_data
.data
== NULL
) {
447 DEBUG(0,("push_message: malloc fail (3)\n"));
453 DLIST_ADD_END(deferred_open_queue
, msg
, struct pending_message_list
*);
455 DEBUG(10,("push_message: pushed message length %u on "
456 "deferred_open_queue\n", (unsigned int)msg_len
));
461 /****************************************************************************
462 Function to delete a sharing violation open message by mid.
463 ****************************************************************************/
465 void remove_deferred_open_smb_message(uint16 mid
)
467 struct pending_message_list
*pml
;
469 for (pml
= deferred_open_queue
; pml
; pml
= pml
->next
) {
470 if (mid
== SVAL(pml
->buf
.data
,smb_mid
)) {
471 DEBUG(10,("remove_sharing_violation_open_smb_message: "
472 "deleting mid %u len %u\n",
474 (unsigned int)pml
->buf
.length
));
475 DLIST_REMOVE(deferred_open_queue
, pml
);
482 /****************************************************************************
483 Move a sharing violation open retry message to the front of the list and
484 schedule it for immediate processing.
485 ****************************************************************************/
487 void schedule_deferred_open_smb_message(uint16 mid
)
489 struct pending_message_list
*pml
;
492 for (pml
= deferred_open_queue
; pml
; pml
= pml
->next
) {
493 uint16 msg_mid
= SVAL(pml
->buf
.data
,smb_mid
);
494 DEBUG(10,("schedule_deferred_open_smb_message: [%d] msg_mid = %u\n", i
++,
495 (unsigned int)msg_mid
));
496 if (mid
== msg_mid
) {
498 if (pml
->processed
) {
499 /* A processed message should not be
501 DEBUG(0,("schedule_deferred_open_smb_message: LOGIC ERROR "
502 "message mid %u was already processed\n",
503 (unsigned int)msg_mid
));
507 DEBUG(10,("schedule_deferred_open_smb_message: scheduling mid %u\n",
509 pml
->end_time
.tv_sec
= 0;
510 pml
->end_time
.tv_usec
= 0;
511 DLIST_PROMOTE(deferred_open_queue
, pml
);
516 DEBUG(10,("schedule_deferred_open_smb_message: failed to find message mid %u\n",
520 /****************************************************************************
521 Return true if this mid is on the deferred queue and was not yet processed.
522 ****************************************************************************/
524 bool open_was_deferred(uint16 mid
)
526 struct pending_message_list
*pml
;
528 for (pml
= deferred_open_queue
; pml
; pml
= pml
->next
) {
529 if (SVAL(pml
->buf
.data
,smb_mid
) == mid
&& !pml
->processed
) {
536 /****************************************************************************
537 Return the message queued by this mid.
538 ****************************************************************************/
540 struct pending_message_list
*get_open_deferred_message(uint16 mid
)
542 struct pending_message_list
*pml
;
544 for (pml
= deferred_open_queue
; pml
; pml
= pml
->next
) {
545 if (SVAL(pml
->buf
.data
,smb_mid
) == mid
) {
552 /****************************************************************************
553 Function to push a deferred open smb message onto a linked list of local smb
554 messages ready for processing.
555 ****************************************************************************/
557 bool push_deferred_smb_message(struct smb_request
*req
,
558 struct timeval request_time
,
559 struct timeval timeout
,
560 char *private_data
, size_t priv_len
)
562 struct timeval end_time
;
564 if (req
->unread_bytes
) {
565 DEBUG(0,("push_deferred_smb_message: logic error ! "
566 "unread_bytes = %u\n",
567 (unsigned int)req
->unread_bytes
));
568 smb_panic("push_deferred_smb_message: "
569 "logic error unread_bytes != 0" );
572 end_time
= timeval_sum(&request_time
, &timeout
);
574 DEBUG(10,("push_deferred_open_smb_message: pushing message len %u mid %u "
575 "timeout time [%u.%06u]\n",
576 (unsigned int) smb_len(req
->inbuf
)+4, (unsigned int)req
->mid
,
577 (unsigned int)end_time
.tv_sec
,
578 (unsigned int)end_time
.tv_usec
));
580 return push_queued_message(req
, request_time
, end_time
,
581 private_data
, priv_len
);
585 struct timed_event
*te
;
586 struct timeval interval
;
588 bool (*handler
)(const struct timeval
*now
, void *private_data
);
592 static void smbd_idle_event_handler(struct event_context
*ctx
,
593 struct timed_event
*te
,
597 struct idle_event
*event
=
598 talloc_get_type_abort(private_data
, struct idle_event
);
600 TALLOC_FREE(event
->te
);
602 DEBUG(10,("smbd_idle_event_handler: %s %p called\n",
603 event
->name
, event
->te
));
605 if (!event
->handler(&now
, event
->private_data
)) {
606 DEBUG(10,("smbd_idle_event_handler: %s %p stopped\n",
607 event
->name
, event
->te
));
608 /* Don't repeat, delete ourselves */
613 DEBUG(10,("smbd_idle_event_handler: %s %p rescheduled\n",
614 event
->name
, event
->te
));
616 event
->te
= event_add_timed(ctx
, event
,
617 timeval_sum(&now
, &event
->interval
),
618 smbd_idle_event_handler
, event
);
620 /* We can't do much but fail here. */
621 SMB_ASSERT(event
->te
!= NULL
);
624 struct idle_event
*event_add_idle(struct event_context
*event_ctx
,
626 struct timeval interval
,
628 bool (*handler
)(const struct timeval
*now
,
632 struct idle_event
*result
;
633 struct timeval now
= timeval_current();
635 result
= TALLOC_P(mem_ctx
, struct idle_event
);
636 if (result
== NULL
) {
637 DEBUG(0, ("talloc failed\n"));
641 result
->interval
= interval
;
642 result
->handler
= handler
;
643 result
->private_data
= private_data
;
645 if (!(result
->name
= talloc_asprintf(result
, "idle_evt(%s)", name
))) {
646 DEBUG(0, ("talloc failed\n"));
651 result
->te
= event_add_timed(event_ctx
, result
,
652 timeval_sum(&now
, &interval
),
653 smbd_idle_event_handler
, result
);
654 if (result
->te
== NULL
) {
655 DEBUG(0, ("event_add_timed failed\n"));
660 DEBUG(10,("event_add_idle: %s %p\n", result
->name
, result
->te
));
664 /****************************************************************************
665 Do all async processing in here. This includes kernel oplock messages, change
667 ****************************************************************************/
669 static void async_processing(fd_set
*pfds
)
671 DEBUG(10,("async_processing: Doing async processing.\n"));
675 process_kernel_oplocks(smbd_messaging_context(), pfds
);
677 /* Do the aio check again after receive_local_message as it does a
678 select and may have eaten our signal. */
679 /* Is this till true? -- vl */
683 exit_server_cleanly("termination signal");
686 /* check for sighup processing */
687 if (reload_after_sighup
) {
688 change_to_root_user();
689 DEBUG(1,("Reloading services after SIGHUP\n"));
690 reload_services(False
);
691 reload_after_sighup
= 0;
695 /****************************************************************************
696 Add a fd to the set we will be select(2)ing on.
697 ****************************************************************************/
699 static int select_on_fd(int fd
, int maxfd
, fd_set
*fds
)
703 maxfd
= MAX(maxfd
, fd
);
709 /****************************************************************************
710 Do a select on an two fd's - with timeout.
712 If a local udp message has been pushed onto the
713 queue (this can only happen during oplock break
714 processing) call async_processing()
716 If a pending smb message has been pushed onto the
717 queue (this can only happen during oplock break
718 processing) return this next.
720 If the first smbfd is ready then read an smb from it.
721 if the second (loopback UDP) fd is ready then read a message
722 from it and setup the buffer header to identify the length
724 Returns False on timeout or error.
727 The timeout is in milliseconds
728 ****************************************************************************/
730 static NTSTATUS
receive_message_or_smb(TALLOC_CTX
*mem_ctx
, char **buffer
,
732 size_t *p_unread
, bool *p_encrypted
)
745 to
.tv_sec
= SMBD_SELECT_TIMEOUT
;
749 * Note that this call must be before processing any SMB
750 * messages as we need to synchronously process any messages
751 * we may have sent to ourselves from the previous SMB.
753 message_dispatch(smbd_messaging_context());
756 * Check to see if we already have a message on the deferred open queue
757 * and it's time to schedule.
759 if(deferred_open_queue
!= NULL
) {
760 bool pop_message
= False
;
761 struct pending_message_list
*msg
= deferred_open_queue
;
763 if (timeval_is_zero(&msg
->end_time
)) {
770 tdif
= usec_time_diff(&msg
->end_time
, &tv
);
772 /* Timed out. Schedule...*/
774 DEBUG(10,("receive_message_or_smb: queued message timed out.\n"));
776 /* Make a more accurate select timeout. */
777 to
.tv_sec
= tdif
/ 1000000;
778 to
.tv_usec
= tdif
% 1000000;
779 DEBUG(10,("receive_message_or_smb: select with timeout of [%u.%06u]\n",
780 (unsigned int)to
.tv_sec
, (unsigned int)to
.tv_usec
));
786 *buffer
= (char *)talloc_memdup(mem_ctx
, msg
->buf
.data
,
788 if (*buffer
== NULL
) {
789 DEBUG(0, ("talloc failed\n"));
790 return NT_STATUS_NO_MEMORY
;
792 *buffer_len
= msg
->buf
.length
;
793 *p_encrypted
= msg
->encrypted
;
795 /* We leave this message on the queue so the open code can
796 know this is a retry. */
797 DEBUG(5,("receive_message_or_smb: returning deferred open smb message.\n"));
799 /* Mark the message as processed so this is not
800 * re-processed in error. */
801 msg
->processed
= true;
807 * Setup the select fd sets.
814 * Ensure we process oplock break messages by preference.
815 * We have to do this before the select, after the select
816 * and if the select returns EINTR. This is due to the fact
817 * that the selects called from async_processing can eat an EINTR
818 * caused by a signal (we can't take the break message there).
819 * This is hideously complex - *MUST* be simplified for 3.0 ! JRA.
822 if (oplock_message_waiting(&r_fds
)) {
823 DEBUG(10,("receive_message_or_smb: oplock_message is waiting.\n"));
824 async_processing(&r_fds
);
826 * After async processing we must go and do the select again, as
827 * the state of the flag in fds for the server file descriptor is
828 * indeterminate - we may have done I/O on it in the oplock processing. JRA.
834 * Are there any timed events waiting ? If so, ensure we don't
835 * select for longer than it would take to wait for them.
842 event_add_to_select_args(smbd_event_context(), &now
,
843 &r_fds
, &w_fds
, &to
, &maxfd
);
846 if (timeval_is_zero(&to
)) {
847 /* Process a timed event now... */
848 if (run_events(smbd_event_context(), 0, NULL
, NULL
)) {
855 START_PROFILE(smbd_idle
);
857 maxfd
= select_on_fd(smbd_server_fd(), maxfd
, &r_fds
);
858 maxfd
= select_on_fd(oplock_notify_fd(), maxfd
, &r_fds
);
860 selrtn
= sys_select(maxfd
+1,&r_fds
,&w_fds
,NULL
,&to
);
863 END_PROFILE(smbd_idle
);
867 if (run_events(smbd_event_context(), selrtn
, &r_fds
, &w_fds
)) {
871 /* if we get EINTR then maybe we have received an oplock
872 signal - treat this as select returning 1. This is ugly, but
873 is the best we can do until the oplock code knows more about
875 if (selrtn
== -1 && errno
== EINTR
) {
876 async_processing(&r_fds
);
878 * After async processing we must go and do the select again, as
879 * the state of the flag in fds for the server file descriptor is
880 * indeterminate - we may have done I/O on it in the oplock processing. JRA.
887 /* something is wrong. Maybe the socket is dead? */
888 return map_nt_error_from_unix(errno
);
891 /* Did we timeout ? */
897 * Ensure we process oplock break messages by preference.
898 * This is IMPORTANT ! Otherwise we can starve other processes
899 * sending us an oplock break message. JRA.
902 if (oplock_message_waiting(&r_fds
)) {
903 async_processing(&r_fds
);
905 * After async processing we must go and do the select again, as
906 * the state of the flag in fds for the server file descriptor is
907 * indeterminate - we may have done I/O on it in the oplock processing. JRA.
913 * We've just woken up from a protentially long select sleep.
914 * Ensure we process local messages as we need to synchronously
915 * process any messages from other smbd's to avoid file rename race
916 * conditions. This call is cheap if there are no messages waiting.
919 message_dispatch(smbd_messaging_context());
921 status
= receive_smb_talloc(mem_ctx
, smbd_server_fd(), buffer
, 0,
922 p_unread
, p_encrypted
, &len
);
924 if (!NT_STATUS_IS_OK(status
)) {
934 * Only allow 5 outstanding trans requests. We're allocating memory, so
938 NTSTATUS
allow_new_trans(struct trans_state
*list
, int mid
)
941 for (; list
!= NULL
; list
= list
->next
) {
943 if (list
->mid
== mid
) {
944 return NT_STATUS_INVALID_PARAMETER
;
950 return NT_STATUS_INSUFFICIENT_RESOURCES
;
956 /****************************************************************************
957 We're terminating and have closed all our files/connections etc.
958 If there are any pending local messages we need to respond to them
959 before termination so that other smbds don't think we just died whilst
961 ****************************************************************************/
963 void respond_to_all_remaining_local_messages(void)
966 * Assert we have no exclusive open oplocks.
969 if(get_number_of_exclusive_open_oplocks()) {
970 DEBUG(0,("respond_to_all_remaining_local_messages: PANIC : we have %d exclusive oplocks.\n",
971 get_number_of_exclusive_open_oplocks() ));
975 process_kernel_oplocks(smbd_messaging_context(), NULL
);
982 These flags determine some of the permissions required to do an operation
984 Note that I don't set NEED_WRITE on some write operations because they
985 are used by some brain-dead clients when printing, and I don't want to
986 force write permissions on print services.
988 #define AS_USER (1<<0)
989 #define NEED_WRITE (1<<1) /* Must be paired with AS_USER */
990 #define TIME_INIT (1<<2)
991 #define CAN_IPC (1<<3) /* Must be paired with AS_USER */
992 #define AS_GUEST (1<<5) /* Must *NOT* be paired with AS_USER */
993 #define DO_CHDIR (1<<6)
996 define a list of possible SMB messages and their corresponding
997 functions. Any message that has a NULL function is unimplemented -
998 please feel free to contribute implementations!
1000 static const struct smb_message_struct
{
1002 void (*fn
)(struct smb_request
*req
);
1004 } smb_messages
[256] = {
1006 /* 0x00 */ { "SMBmkdir",reply_mkdir
,AS_USER
| NEED_WRITE
},
1007 /* 0x01 */ { "SMBrmdir",reply_rmdir
,AS_USER
| NEED_WRITE
},
1008 /* 0x02 */ { "SMBopen",reply_open
,AS_USER
},
1009 /* 0x03 */ { "SMBcreate",reply_mknew
,AS_USER
},
1010 /* 0x04 */ { "SMBclose",reply_close
,AS_USER
| CAN_IPC
},
1011 /* 0x05 */ { "SMBflush",reply_flush
,AS_USER
},
1012 /* 0x06 */ { "SMBunlink",reply_unlink
,AS_USER
| NEED_WRITE
},
1013 /* 0x07 */ { "SMBmv",reply_mv
,AS_USER
| NEED_WRITE
},
1014 /* 0x08 */ { "SMBgetatr",reply_getatr
,AS_USER
},
1015 /* 0x09 */ { "SMBsetatr",reply_setatr
,AS_USER
| NEED_WRITE
},
1016 /* 0x0a */ { "SMBread",reply_read
,AS_USER
},
1017 /* 0x0b */ { "SMBwrite",reply_write
,AS_USER
| CAN_IPC
},
1018 /* 0x0c */ { "SMBlock",reply_lock
,AS_USER
},
1019 /* 0x0d */ { "SMBunlock",reply_unlock
,AS_USER
},
1020 /* 0x0e */ { "SMBctemp",reply_ctemp
,AS_USER
},
1021 /* 0x0f */ { "SMBmknew",reply_mknew
,AS_USER
},
1022 /* 0x10 */ { "SMBcheckpath",reply_checkpath
,AS_USER
},
1023 /* 0x11 */ { "SMBexit",reply_exit
,DO_CHDIR
},
1024 /* 0x12 */ { "SMBlseek",reply_lseek
,AS_USER
},
1025 /* 0x13 */ { "SMBlockread",reply_lockread
,AS_USER
},
1026 /* 0x14 */ { "SMBwriteunlock",reply_writeunlock
,AS_USER
},
1027 /* 0x15 */ { NULL
, NULL
, 0 },
1028 /* 0x16 */ { NULL
, NULL
, 0 },
1029 /* 0x17 */ { NULL
, NULL
, 0 },
1030 /* 0x18 */ { NULL
, NULL
, 0 },
1031 /* 0x19 */ { NULL
, NULL
, 0 },
1032 /* 0x1a */ { "SMBreadbraw",reply_readbraw
,AS_USER
},
1033 /* 0x1b */ { "SMBreadBmpx",reply_readbmpx
,AS_USER
},
1034 /* 0x1c */ { "SMBreadBs",reply_readbs
,AS_USER
},
1035 /* 0x1d */ { "SMBwritebraw",reply_writebraw
,AS_USER
},
1036 /* 0x1e */ { "SMBwriteBmpx",reply_writebmpx
,AS_USER
},
1037 /* 0x1f */ { "SMBwriteBs",reply_writebs
,AS_USER
},
1038 /* 0x20 */ { "SMBwritec", NULL
,0},
1039 /* 0x21 */ { NULL
, NULL
, 0 },
1040 /* 0x22 */ { "SMBsetattrE",reply_setattrE
,AS_USER
| NEED_WRITE
},
1041 /* 0x23 */ { "SMBgetattrE",reply_getattrE
,AS_USER
},
1042 /* 0x24 */ { "SMBlockingX",reply_lockingX
,AS_USER
},
1043 /* 0x25 */ { "SMBtrans",reply_trans
,AS_USER
| CAN_IPC
},
1044 /* 0x26 */ { "SMBtranss",reply_transs
,AS_USER
| CAN_IPC
},
1045 /* 0x27 */ { "SMBioctl",reply_ioctl
,0},
1046 /* 0x28 */ { "SMBioctls", NULL
,AS_USER
},
1047 /* 0x29 */ { "SMBcopy",reply_copy
,AS_USER
| NEED_WRITE
},
1048 /* 0x2a */ { "SMBmove", NULL
,AS_USER
| NEED_WRITE
},
1049 /* 0x2b */ { "SMBecho",reply_echo
,0},
1050 /* 0x2c */ { "SMBwriteclose",reply_writeclose
,AS_USER
},
1051 /* 0x2d */ { "SMBopenX",reply_open_and_X
,AS_USER
| CAN_IPC
},
1052 /* 0x2e */ { "SMBreadX",reply_read_and_X
,AS_USER
| CAN_IPC
},
1053 /* 0x2f */ { "SMBwriteX",reply_write_and_X
,AS_USER
| CAN_IPC
},
1054 /* 0x30 */ { NULL
, NULL
, 0 },
1055 /* 0x31 */ { NULL
, NULL
, 0 },
1056 /* 0x32 */ { "SMBtrans2",reply_trans2
, AS_USER
| CAN_IPC
},
1057 /* 0x33 */ { "SMBtranss2",reply_transs2
, AS_USER
| CAN_IPC
},
1058 /* 0x34 */ { "SMBfindclose",reply_findclose
,AS_USER
},
1059 /* 0x35 */ { "SMBfindnclose",reply_findnclose
,AS_USER
},
1060 /* 0x36 */ { NULL
, NULL
, 0 },
1061 /* 0x37 */ { NULL
, NULL
, 0 },
1062 /* 0x38 */ { NULL
, NULL
, 0 },
1063 /* 0x39 */ { NULL
, NULL
, 0 },
1064 /* 0x3a */ { NULL
, NULL
, 0 },
1065 /* 0x3b */ { NULL
, NULL
, 0 },
1066 /* 0x3c */ { NULL
, NULL
, 0 },
1067 /* 0x3d */ { NULL
, NULL
, 0 },
1068 /* 0x3e */ { NULL
, NULL
, 0 },
1069 /* 0x3f */ { NULL
, NULL
, 0 },
1070 /* 0x40 */ { NULL
, NULL
, 0 },
1071 /* 0x41 */ { NULL
, NULL
, 0 },
1072 /* 0x42 */ { NULL
, NULL
, 0 },
1073 /* 0x43 */ { NULL
, NULL
, 0 },
1074 /* 0x44 */ { NULL
, NULL
, 0 },
1075 /* 0x45 */ { NULL
, NULL
, 0 },
1076 /* 0x46 */ { NULL
, NULL
, 0 },
1077 /* 0x47 */ { NULL
, NULL
, 0 },
1078 /* 0x48 */ { NULL
, NULL
, 0 },
1079 /* 0x49 */ { NULL
, NULL
, 0 },
1080 /* 0x4a */ { NULL
, NULL
, 0 },
1081 /* 0x4b */ { NULL
, NULL
, 0 },
1082 /* 0x4c */ { NULL
, NULL
, 0 },
1083 /* 0x4d */ { NULL
, NULL
, 0 },
1084 /* 0x4e */ { NULL
, NULL
, 0 },
1085 /* 0x4f */ { NULL
, NULL
, 0 },
1086 /* 0x50 */ { NULL
, NULL
, 0 },
1087 /* 0x51 */ { NULL
, NULL
, 0 },
1088 /* 0x52 */ { NULL
, NULL
, 0 },
1089 /* 0x53 */ { NULL
, NULL
, 0 },
1090 /* 0x54 */ { NULL
, NULL
, 0 },
1091 /* 0x55 */ { NULL
, NULL
, 0 },
1092 /* 0x56 */ { NULL
, NULL
, 0 },
1093 /* 0x57 */ { NULL
, NULL
, 0 },
1094 /* 0x58 */ { NULL
, NULL
, 0 },
1095 /* 0x59 */ { NULL
, NULL
, 0 },
1096 /* 0x5a */ { NULL
, NULL
, 0 },
1097 /* 0x5b */ { NULL
, NULL
, 0 },
1098 /* 0x5c */ { NULL
, NULL
, 0 },
1099 /* 0x5d */ { NULL
, NULL
, 0 },
1100 /* 0x5e */ { NULL
, NULL
, 0 },
1101 /* 0x5f */ { NULL
, NULL
, 0 },
1102 /* 0x60 */ { NULL
, NULL
, 0 },
1103 /* 0x61 */ { NULL
, NULL
, 0 },
1104 /* 0x62 */ { NULL
, NULL
, 0 },
1105 /* 0x63 */ { NULL
, NULL
, 0 },
1106 /* 0x64 */ { NULL
, NULL
, 0 },
1107 /* 0x65 */ { NULL
, NULL
, 0 },
1108 /* 0x66 */ { NULL
, NULL
, 0 },
1109 /* 0x67 */ { NULL
, NULL
, 0 },
1110 /* 0x68 */ { NULL
, NULL
, 0 },
1111 /* 0x69 */ { NULL
, NULL
, 0 },
1112 /* 0x6a */ { NULL
, NULL
, 0 },
1113 /* 0x6b */ { NULL
, NULL
, 0 },
1114 /* 0x6c */ { NULL
, NULL
, 0 },
1115 /* 0x6d */ { NULL
, NULL
, 0 },
1116 /* 0x6e */ { NULL
, NULL
, 0 },
1117 /* 0x6f */ { NULL
, NULL
, 0 },
1118 /* 0x70 */ { "SMBtcon",reply_tcon
,0},
1119 /* 0x71 */ { "SMBtdis",reply_tdis
,DO_CHDIR
},
1120 /* 0x72 */ { "SMBnegprot",reply_negprot
,0},
1121 /* 0x73 */ { "SMBsesssetupX",reply_sesssetup_and_X
,0},
1122 /* 0x74 */ { "SMBulogoffX",reply_ulogoffX
, 0}, /* ulogoff doesn't give a valid TID */
1123 /* 0x75 */ { "SMBtconX",reply_tcon_and_X
,0},
1124 /* 0x76 */ { NULL
, NULL
, 0 },
1125 /* 0x77 */ { NULL
, NULL
, 0 },
1126 /* 0x78 */ { NULL
, NULL
, 0 },
1127 /* 0x79 */ { NULL
, NULL
, 0 },
1128 /* 0x7a */ { NULL
, NULL
, 0 },
1129 /* 0x7b */ { NULL
, NULL
, 0 },
1130 /* 0x7c */ { NULL
, NULL
, 0 },
1131 /* 0x7d */ { NULL
, NULL
, 0 },
1132 /* 0x7e */ { NULL
, NULL
, 0 },
1133 /* 0x7f */ { NULL
, NULL
, 0 },
1134 /* 0x80 */ { "SMBdskattr",reply_dskattr
,AS_USER
},
1135 /* 0x81 */ { "SMBsearch",reply_search
,AS_USER
},
1136 /* 0x82 */ { "SMBffirst",reply_search
,AS_USER
},
1137 /* 0x83 */ { "SMBfunique",reply_search
,AS_USER
},
1138 /* 0x84 */ { "SMBfclose",reply_fclose
,AS_USER
},
1139 /* 0x85 */ { NULL
, NULL
, 0 },
1140 /* 0x86 */ { NULL
, NULL
, 0 },
1141 /* 0x87 */ { NULL
, NULL
, 0 },
1142 /* 0x88 */ { NULL
, NULL
, 0 },
1143 /* 0x89 */ { NULL
, NULL
, 0 },
1144 /* 0x8a */ { NULL
, NULL
, 0 },
1145 /* 0x8b */ { NULL
, NULL
, 0 },
1146 /* 0x8c */ { NULL
, NULL
, 0 },
1147 /* 0x8d */ { NULL
, NULL
, 0 },
1148 /* 0x8e */ { NULL
, NULL
, 0 },
1149 /* 0x8f */ { NULL
, NULL
, 0 },
1150 /* 0x90 */ { NULL
, NULL
, 0 },
1151 /* 0x91 */ { NULL
, NULL
, 0 },
1152 /* 0x92 */ { NULL
, NULL
, 0 },
1153 /* 0x93 */ { NULL
, NULL
, 0 },
1154 /* 0x94 */ { NULL
, NULL
, 0 },
1155 /* 0x95 */ { NULL
, NULL
, 0 },
1156 /* 0x96 */ { NULL
, NULL
, 0 },
1157 /* 0x97 */ { NULL
, NULL
, 0 },
1158 /* 0x98 */ { NULL
, NULL
, 0 },
1159 /* 0x99 */ { NULL
, NULL
, 0 },
1160 /* 0x9a */ { NULL
, NULL
, 0 },
1161 /* 0x9b */ { NULL
, NULL
, 0 },
1162 /* 0x9c */ { NULL
, NULL
, 0 },
1163 /* 0x9d */ { NULL
, NULL
, 0 },
1164 /* 0x9e */ { NULL
, NULL
, 0 },
1165 /* 0x9f */ { NULL
, NULL
, 0 },
1166 /* 0xa0 */ { "SMBnttrans",reply_nttrans
, AS_USER
| CAN_IPC
},
1167 /* 0xa1 */ { "SMBnttranss",reply_nttranss
, AS_USER
| CAN_IPC
},
1168 /* 0xa2 */ { "SMBntcreateX",reply_ntcreate_and_X
, AS_USER
| CAN_IPC
},
1169 /* 0xa3 */ { NULL
, NULL
, 0 },
1170 /* 0xa4 */ { "SMBntcancel",reply_ntcancel
, 0 },
1171 /* 0xa5 */ { "SMBntrename",reply_ntrename
, AS_USER
| NEED_WRITE
},
1172 /* 0xa6 */ { NULL
, NULL
, 0 },
1173 /* 0xa7 */ { NULL
, NULL
, 0 },
1174 /* 0xa8 */ { NULL
, NULL
, 0 },
1175 /* 0xa9 */ { NULL
, NULL
, 0 },
1176 /* 0xaa */ { NULL
, NULL
, 0 },
1177 /* 0xab */ { NULL
, NULL
, 0 },
1178 /* 0xac */ { NULL
, NULL
, 0 },
1179 /* 0xad */ { NULL
, NULL
, 0 },
1180 /* 0xae */ { NULL
, NULL
, 0 },
1181 /* 0xaf */ { NULL
, NULL
, 0 },
1182 /* 0xb0 */ { NULL
, NULL
, 0 },
1183 /* 0xb1 */ { NULL
, NULL
, 0 },
1184 /* 0xb2 */ { NULL
, NULL
, 0 },
1185 /* 0xb3 */ { NULL
, NULL
, 0 },
1186 /* 0xb4 */ { NULL
, NULL
, 0 },
1187 /* 0xb5 */ { NULL
, NULL
, 0 },
1188 /* 0xb6 */ { NULL
, NULL
, 0 },
1189 /* 0xb7 */ { NULL
, NULL
, 0 },
1190 /* 0xb8 */ { NULL
, NULL
, 0 },
1191 /* 0xb9 */ { NULL
, NULL
, 0 },
1192 /* 0xba */ { NULL
, NULL
, 0 },
1193 /* 0xbb */ { NULL
, NULL
, 0 },
1194 /* 0xbc */ { NULL
, NULL
, 0 },
1195 /* 0xbd */ { NULL
, NULL
, 0 },
1196 /* 0xbe */ { NULL
, NULL
, 0 },
1197 /* 0xbf */ { NULL
, NULL
, 0 },
1198 /* 0xc0 */ { "SMBsplopen",reply_printopen
,AS_USER
},
1199 /* 0xc1 */ { "SMBsplwr",reply_printwrite
,AS_USER
},
1200 /* 0xc2 */ { "SMBsplclose",reply_printclose
,AS_USER
},
1201 /* 0xc3 */ { "SMBsplretq",reply_printqueue
,AS_USER
},
1202 /* 0xc4 */ { NULL
, NULL
, 0 },
1203 /* 0xc5 */ { NULL
, NULL
, 0 },
1204 /* 0xc6 */ { NULL
, NULL
, 0 },
1205 /* 0xc7 */ { NULL
, NULL
, 0 },
1206 /* 0xc8 */ { NULL
, NULL
, 0 },
1207 /* 0xc9 */ { NULL
, NULL
, 0 },
1208 /* 0xca */ { NULL
, NULL
, 0 },
1209 /* 0xcb */ { NULL
, NULL
, 0 },
1210 /* 0xcc */ { NULL
, NULL
, 0 },
1211 /* 0xcd */ { NULL
, NULL
, 0 },
1212 /* 0xce */ { NULL
, NULL
, 0 },
1213 /* 0xcf */ { NULL
, NULL
, 0 },
1214 /* 0xd0 */ { "SMBsends",reply_sends
,AS_GUEST
},
1215 /* 0xd1 */ { "SMBsendb", NULL
,AS_GUEST
},
1216 /* 0xd2 */ { "SMBfwdname", NULL
,AS_GUEST
},
1217 /* 0xd3 */ { "SMBcancelf", NULL
,AS_GUEST
},
1218 /* 0xd4 */ { "SMBgetmac", NULL
,AS_GUEST
},
1219 /* 0xd5 */ { "SMBsendstrt",reply_sendstrt
,AS_GUEST
},
1220 /* 0xd6 */ { "SMBsendend",reply_sendend
,AS_GUEST
},
1221 /* 0xd7 */ { "SMBsendtxt",reply_sendtxt
,AS_GUEST
},
1222 /* 0xd8 */ { NULL
, NULL
, 0 },
1223 /* 0xd9 */ { NULL
, NULL
, 0 },
1224 /* 0xda */ { NULL
, NULL
, 0 },
1225 /* 0xdb */ { NULL
, NULL
, 0 },
1226 /* 0xdc */ { NULL
, NULL
, 0 },
1227 /* 0xdd */ { NULL
, NULL
, 0 },
1228 /* 0xde */ { NULL
, NULL
, 0 },
1229 /* 0xdf */ { NULL
, NULL
, 0 },
1230 /* 0xe0 */ { NULL
, NULL
, 0 },
1231 /* 0xe1 */ { NULL
, NULL
, 0 },
1232 /* 0xe2 */ { NULL
, NULL
, 0 },
1233 /* 0xe3 */ { NULL
, NULL
, 0 },
1234 /* 0xe4 */ { NULL
, NULL
, 0 },
1235 /* 0xe5 */ { NULL
, NULL
, 0 },
1236 /* 0xe6 */ { NULL
, NULL
, 0 },
1237 /* 0xe7 */ { NULL
, NULL
, 0 },
1238 /* 0xe8 */ { NULL
, NULL
, 0 },
1239 /* 0xe9 */ { NULL
, NULL
, 0 },
1240 /* 0xea */ { NULL
, NULL
, 0 },
1241 /* 0xeb */ { NULL
, NULL
, 0 },
1242 /* 0xec */ { NULL
, NULL
, 0 },
1243 /* 0xed */ { NULL
, NULL
, 0 },
1244 /* 0xee */ { NULL
, NULL
, 0 },
1245 /* 0xef */ { NULL
, NULL
, 0 },
1246 /* 0xf0 */ { NULL
, NULL
, 0 },
1247 /* 0xf1 */ { NULL
, NULL
, 0 },
1248 /* 0xf2 */ { NULL
, NULL
, 0 },
1249 /* 0xf3 */ { NULL
, NULL
, 0 },
1250 /* 0xf4 */ { NULL
, NULL
, 0 },
1251 /* 0xf5 */ { NULL
, NULL
, 0 },
1252 /* 0xf6 */ { NULL
, NULL
, 0 },
1253 /* 0xf7 */ { NULL
, NULL
, 0 },
1254 /* 0xf8 */ { NULL
, NULL
, 0 },
1255 /* 0xf9 */ { NULL
, NULL
, 0 },
1256 /* 0xfa */ { NULL
, NULL
, 0 },
1257 /* 0xfb */ { NULL
, NULL
, 0 },
1258 /* 0xfc */ { NULL
, NULL
, 0 },
1259 /* 0xfd */ { NULL
, NULL
, 0 },
1260 /* 0xfe */ { NULL
, NULL
, 0 },
1261 /* 0xff */ { NULL
, NULL
, 0 }
1265 /*******************************************************************
1266 allocate and initialize a reply packet
1267 ********************************************************************/
1269 bool create_outbuf(TALLOC_CTX
*mem_ctx
, const char *inbuf
, char **outbuf
,
1270 uint8_t num_words
, uint32_t num_bytes
)
1273 * Protect against integer wrap
1275 if ((num_bytes
> 0xffffff)
1276 || ((num_bytes
+ smb_size
+ num_words
*2) > 0xffffff)) {
1278 if (asprintf(&msg
, "num_bytes too large: %u",
1279 (unsigned)num_bytes
) == -1) {
1280 msg
= CONST_DISCARD(char *, "num_bytes too large");
1285 *outbuf
= TALLOC_ARRAY(mem_ctx
, char,
1286 smb_size
+ num_words
*2 + num_bytes
);
1287 if (*outbuf
== NULL
) {
1291 construct_reply_common(inbuf
, *outbuf
);
1292 srv_set_message(*outbuf
, num_words
, num_bytes
, false);
1294 * Zero out the word area, the caller has to take care of the bcc area
1297 if (num_words
!= 0) {
1298 memset(*outbuf
+ smb_vwv0
, 0, num_words
*2);
1304 void reply_outbuf(struct smb_request
*req
, uint8 num_words
, uint32 num_bytes
)
1307 if (!create_outbuf(req
, (char *)req
->inbuf
, &outbuf
, num_words
,
1309 smb_panic("could not allocate output buffer\n");
1311 req
->outbuf
= (uint8_t *)outbuf
;
1315 /*******************************************************************
1316 Dump a packet to a file.
1317 ********************************************************************/
1319 static void smb_dump(const char *name
, int type
, const char *data
, ssize_t len
)
1323 if (DEBUGLEVEL
< 50) {
1327 if (len
< 4) len
= smb_len(data
)+4;
1328 for (i
=1;i
<100;i
++) {
1329 if (asprintf(&fname
, "/tmp/%s.%d.%s", name
, i
,
1330 type
? "req" : "resp") == -1) {
1333 fd
= open(fname
, O_WRONLY
|O_CREAT
|O_EXCL
, 0644);
1334 if (fd
!= -1 || errno
!= EEXIST
) break;
1337 ssize_t ret
= write(fd
, data
, len
);
1339 DEBUG(0,("smb_dump: problem: write returned %d\n", (int)ret
));
1341 DEBUG(0,("created %s len %lu\n", fname
, (unsigned long)len
));
1346 /****************************************************************************
1347 Prepare everything for calling the actual request function, and potentially
1348 call the request function via the "new" interface.
1350 Return False if the "legacy" function needs to be called, everything is
1353 Return True if we're done.
1355 I know this API sucks, but it is the one with the least code change I could
1357 ****************************************************************************/
1359 static connection_struct
*switch_message(uint8 type
, struct smb_request
*req
, int size
)
1363 connection_struct
*conn
= NULL
;
1365 static uint16 last_session_tag
= UID_FIELD_INVALID
;
1369 /* Make sure this is an SMB packet. smb_size contains NetBIOS header
1370 * so subtract 4 from it. */
1371 if (!valid_smb_header(req
->inbuf
)
1372 || (size
< (smb_size
- 4))) {
1373 DEBUG(2,("Non-SMB packet of length %d. Terminating server\n",
1374 smb_len(req
->inbuf
)));
1375 exit_server_cleanly("Non-SMB packet");
1378 if (smb_messages
[type
].fn
== NULL
) {
1379 DEBUG(0,("Unknown message type %d!\n",type
));
1380 smb_dump("Unknown", 1, (char *)req
->inbuf
, size
);
1381 reply_unknown_new(req
, type
);
1385 flags
= smb_messages
[type
].flags
;
1387 /* In share mode security we must ignore the vuid. */
1388 session_tag
= (lp_security() == SEC_SHARE
)
1389 ? UID_FIELD_INVALID
: req
->vuid
;
1392 DEBUG(3,("switch message %s (pid %d) conn 0x%lx\n", smb_fn_name(type
),
1393 (int)sys_getpid(), (unsigned long)conn
));
1395 smb_dump(smb_fn_name(type
), 1, (char *)req
->inbuf
, size
);
1397 /* Ensure this value is replaced in the incoming packet. */
1398 SSVAL(req
->inbuf
,smb_uid
,session_tag
);
1401 * Ensure the correct username is in current_user_info. This is a
1402 * really ugly bugfix for problems with multiple session_setup_and_X's
1403 * being done and allowing %U and %G substitutions to work correctly.
1404 * There is a reason this code is done here, don't move it unless you
1405 * know what you're doing... :-).
1409 if (session_tag
!= last_session_tag
) {
1410 user_struct
*vuser
= NULL
;
1412 last_session_tag
= session_tag
;
1413 if(session_tag
!= UID_FIELD_INVALID
) {
1414 vuser
= get_valid_user_struct(session_tag
);
1416 set_current_user_info(
1417 vuser
->server_info
->sanitized_username
,
1418 vuser
->server_info
->unix_name
,
1419 pdb_get_fullname(vuser
->server_info
1421 pdb_get_domain(vuser
->server_info
1427 /* Does this call need to be run as the connected user? */
1428 if (flags
& AS_USER
) {
1430 /* Does this call need a valid tree connection? */
1433 * Amazingly, the error code depends on the command
1436 if (type
== SMBntcreateX
) {
1437 reply_nterror(req
, NT_STATUS_INVALID_HANDLE
);
1439 reply_doserror(req
, ERRSRV
, ERRinvnid
);
1444 if (!change_to_user(conn
,session_tag
)) {
1445 reply_nterror(req
, NT_STATUS_DOS(ERRSRV
, ERRbaduid
));
1449 /* All NEED_WRITE and CAN_IPC flags must also have AS_USER. */
1451 /* Does it need write permission? */
1452 if ((flags
& NEED_WRITE
) && !CAN_WRITE(conn
)) {
1453 reply_nterror(req
, NT_STATUS_MEDIA_WRITE_PROTECTED
);
1457 /* IPC services are limited */
1458 if (IS_IPC(conn
) && !(flags
& CAN_IPC
)) {
1459 reply_doserror(req
, ERRSRV
,ERRaccess
);
1463 /* This call needs to be run as root */
1464 change_to_root_user();
1467 /* load service specific parameters */
1469 if (req
->encrypted
) {
1470 conn
->encrypted_tid
= true;
1471 /* encrypted required from now on. */
1472 conn
->encrypt_level
= Required
;
1473 } else if (ENCRYPTION_REQUIRED(conn
)) {
1474 uint8 com
= CVAL(req
->inbuf
,smb_com
);
1475 if (com
!= SMBtrans2
&& com
!= SMBtranss2
) {
1476 exit_server_cleanly("encryption required "
1482 if (!set_current_service(conn
,SVAL(req
->inbuf
,smb_flg
),
1483 (flags
& (AS_USER
|DO_CHDIR
)
1485 reply_doserror(req
, ERRSRV
, ERRaccess
);
1488 conn
->num_smb_operations
++;
1491 /* does this protocol need to be run as guest? */
1492 if ((flags
& AS_GUEST
)
1493 && (!change_to_guest() ||
1494 !check_access(smbd_server_fd(), lp_hostsallow(-1),
1495 lp_hostsdeny(-1)))) {
1496 reply_doserror(req
, ERRSRV
, ERRaccess
);
1500 smb_messages
[type
].fn(req
);
1504 /****************************************************************************
1505 Construct a reply to the incoming packet.
1506 ****************************************************************************/
1508 static void construct_reply(char *inbuf
, int size
, size_t unread_bytes
, bool encrypted
)
1510 struct pending_message_list
*pml
= NULL
;
1511 uint8 type
= CVAL(inbuf
,smb_com
);
1512 connection_struct
*conn
;
1513 struct smb_request
*req
;
1519 if (!(req
= talloc(talloc_tos(), struct smb_request
))) {
1520 smb_panic("could not allocate smb_request");
1522 init_smb_request(req
, (uint8
*)inbuf
, unread_bytes
, encrypted
);
1524 conn
= switch_message(type
, req
, size
);
1526 /* If this was a deferred message and it's still there and
1527 * was processed, remove it. */
1528 pml
= get_open_deferred_message(req
->mid
);
1529 if (pml
&& pml
->processed
) {
1530 remove_deferred_open_smb_message(req
->mid
);
1533 if (req
->unread_bytes
) {
1534 /* writeX failed. drain socket. */
1535 if (drain_socket(smbd_server_fd(), req
->unread_bytes
) !=
1536 req
->unread_bytes
) {
1537 smb_panic("failed to drain pending bytes");
1539 req
->unread_bytes
= 0;
1542 if (req
->outbuf
== NULL
) {
1546 if (CVAL(req
->outbuf
,0) == 0) {
1547 show_msg((char *)req
->outbuf
);
1550 if (!srv_send_smb(smbd_server_fd(),
1551 (char *)req
->outbuf
,
1552 IS_CONN_ENCRYPTED(conn
)||req
->encrypted
)) {
1553 exit_server_cleanly("construct_reply: srv_send_smb failed.");
1561 /****************************************************************************
1562 Process an smb from the client
1563 ****************************************************************************/
1565 static void process_smb(char *inbuf
, size_t nread
, size_t unread_bytes
, bool encrypted
)
1567 static int trans_num
;
1568 int msg_type
= CVAL(inbuf
,0);
1570 DO_PROFILE_INC(smb_count
);
1572 DEBUG( 6, ( "got message type 0x%x of len 0x%x\n", msg_type
,
1574 DEBUG( 3, ( "Transaction %d of length %d (%u toread)\n", trans_num
,
1576 (unsigned int)unread_bytes
));
1578 if (msg_type
!= 0) {
1580 * NetBIOS session request, keepalive, etc.
1582 reply_special(inbuf
);
1588 construct_reply(inbuf
,nread
,unread_bytes
,encrypted
);
1593 /****************************************************************************
1594 Return a string containing the function name of a SMB command.
1595 ****************************************************************************/
1597 const char *smb_fn_name(int type
)
1599 const char *unknown_name
= "SMBunknown";
1601 if (smb_messages
[type
].name
== NULL
)
1602 return(unknown_name
);
1604 return(smb_messages
[type
].name
);
1607 /****************************************************************************
1608 Helper functions for contruct_reply.
1609 ****************************************************************************/
1611 static uint32 common_flags2
= FLAGS2_LONG_PATH_COMPONENTS
|FLAGS2_32_BIT_ERROR_CODES
;
1613 void add_to_common_flags2(uint32 v
)
1618 void remove_from_common_flags2(uint32 v
)
1620 common_flags2
&= ~v
;
1623 void construct_reply_common(const char *inbuf
, char *outbuf
)
1625 srv_set_message(outbuf
,0,0,false);
1627 SCVAL(outbuf
,smb_com
,CVAL(inbuf
,smb_com
));
1628 SIVAL(outbuf
,smb_rcls
,0);
1629 SCVAL(outbuf
,smb_flg
, FLAG_REPLY
| (CVAL(inbuf
,smb_flg
) & FLAG_CASELESS_PATHNAMES
));
1630 SSVAL(outbuf
,smb_flg2
,
1631 (SVAL(inbuf
,smb_flg2
) & FLAGS2_UNICODE_STRINGS
) |
1633 memset(outbuf
+smb_pidhigh
,'\0',(smb_tid
-smb_pidhigh
));
1635 SSVAL(outbuf
,smb_tid
,SVAL(inbuf
,smb_tid
));
1636 SSVAL(outbuf
,smb_pid
,SVAL(inbuf
,smb_pid
));
1637 SSVAL(outbuf
,smb_uid
,SVAL(inbuf
,smb_uid
));
1638 SSVAL(outbuf
,smb_mid
,SVAL(inbuf
,smb_mid
));
1641 /****************************************************************************
1642 Construct a chained reply and add it to the already made reply
1643 ****************************************************************************/
1645 void chain_reply(struct smb_request
*req
)
1647 static char *orig_inbuf
;
1648 static int orig_size
;
1651 * Dirty little const_discard: We mess with req->inbuf, which is
1652 * declared as const. If maybe at some point this routine gets
1653 * rewritten, this const_discard could go away.
1655 char *inbuf
= CONST_DISCARD(char *, req
->inbuf
);
1656 int size
= smb_len(req
->inbuf
)+4;
1658 int smb_com1
, smb_com2
= CVAL(inbuf
,smb_vwv0
);
1659 unsigned smb_off2
= SVAL(inbuf
,smb_vwv1
);
1663 char inbuf_saved
[smb_wct
];
1664 char *outbuf
= (char *)req
->outbuf
;
1665 size_t outsize
= smb_len(outbuf
) + 4;
1666 size_t outsize_padded
;
1668 size_t ofs
, to_move
;
1670 struct smb_request
*req2
;
1671 size_t caller_outputlen
;
1672 char *caller_output
;
1674 /* Maybe its not chained, or it's an error packet. */
1675 if (smb_com2
== 0xFF || SVAL(outbuf
,smb_rcls
) != 0) {
1676 SCVAL(outbuf
,smb_vwv0
,0xFF);
1680 if (chain_size
== 0) {
1681 /* this is the first part of the chain */
1686 /* Validate smb_off2 */
1687 if ((smb_off2
< smb_wct
- 4) || orig_size
< (smb_off2
+ 4 - smb_wct
)) {
1688 exit_server_cleanly("Bad chained packet");
1692 * We need to save the output the caller added to the chain so that we
1693 * can splice it into the final output buffer later.
1696 if (outsize
<= smb_wct
) {
1697 exit_server_cleanly("Bad chained packet");
1701 caller_outputlen
= outsize
- smb_wct
;
1703 caller_output
= (char *)memdup(outbuf
+ smb_wct
, caller_outputlen
);
1705 if (caller_output
== NULL
) {
1706 /* TODO: NT_STATUS_NO_MEMORY */
1707 smb_panic("could not dup outbuf");
1711 * The original Win95 redirector dies on a reply to
1712 * a lockingX and read chain unless the chain reply is
1713 * 4 byte aligned. JRA.
1716 outsize_padded
= (outsize
+ 3) & ~3;
1717 padding
= outsize_padded
- outsize
;
1720 * remember how much the caller added to the chain, only counting
1721 * stuff after the parameter words
1723 chain_size
+= (outsize_padded
- smb_wct
);
1726 * work out pointers into the original packets. The
1727 * headers on these need to be filled in
1729 inbuf2
= orig_inbuf
+ smb_off2
+ 4 - smb_wct
;
1731 /* remember the original command type */
1732 smb_com1
= CVAL(orig_inbuf
,smb_com
);
1734 /* save the data which will be overwritten by the new headers */
1735 memcpy(inbuf_saved
,inbuf2
,smb_wct
);
1737 /* give the new packet the same header as the last part of the SMB */
1738 memmove(inbuf2
,inbuf
,smb_wct
);
1740 /* create the in buffer */
1741 SCVAL(inbuf2
,smb_com
,smb_com2
);
1743 /* work out the new size for the in buffer. */
1744 new_size
= size
- (inbuf2
- inbuf
);
1746 DEBUG(0,("chain_reply: chain packet size incorrect "
1747 "(orig size = %d, offset = %d)\n",
1748 size
, (int)(inbuf2
- inbuf
) ));
1749 exit_server_cleanly("Bad chained packet");
1753 /* And set it in the header. */
1754 smb_setlen(inbuf2
, new_size
- 4);
1756 DEBUG(3,("Chained message\n"));
1759 if (!(req2
= talloc(talloc_tos(), struct smb_request
))) {
1760 smb_panic("could not allocate smb_request");
1762 init_smb_request(req2
, (uint8
*)inbuf2
,0, req
->encrypted
);
1764 /* process the request */
1765 switch_message(smb_com2
, req2
, new_size
);
1768 * We don't accept deferred operations in chained requests.
1770 SMB_ASSERT(req2
->outbuf
!= NULL
);
1771 outsize2
= smb_len(req2
->outbuf
)+4;
1774 * Move away the new command output so that caller_output fits in,
1775 * copy in the caller_output saved above.
1778 SMB_ASSERT(outsize_padded
>= smb_wct
);
1781 * "ofs" is the space we need for caller_output. Equal to
1782 * caller_outputlen plus the padding.
1785 ofs
= outsize_padded
- smb_wct
;
1788 * "to_move" is the amount of bytes the secondary routine gave us
1791 to_move
= outsize2
- smb_wct
;
1793 if (to_move
+ ofs
+ smb_wct
+ chain_size
> max_send
) {
1794 smb_panic("replies too large -- would have to cut");
1798 * In the "new" API "outbuf" is allocated via reply_outbuf, just for
1799 * the first request in the chain. So we have to re-allocate it. In
1800 * the "old" API the only outbuf ever used is the global OutBuffer
1801 * which is always large enough.
1804 outbuf
= TALLOC_REALLOC_ARRAY(NULL
, outbuf
, char,
1805 to_move
+ ofs
+ smb_wct
);
1806 if (outbuf
== NULL
) {
1807 smb_panic("could not realloc outbuf");
1810 req
->outbuf
= (uint8
*)outbuf
;
1812 memmove(outbuf
+ smb_wct
+ ofs
, req2
->outbuf
+ smb_wct
, to_move
);
1813 memcpy(outbuf
+ smb_wct
, caller_output
, caller_outputlen
);
1816 * copy the new reply header over the old one but preserve the smb_com
1819 memmove(outbuf
, req2
->outbuf
, smb_wct
);
1820 SCVAL(outbuf
, smb_com
, smb_com1
);
1823 * We've just copied in the whole "wct" area from the secondary
1824 * function. Fix up the chaining: com2 and the offset need to be
1828 SCVAL(outbuf
, smb_vwv0
, smb_com2
);
1829 SSVAL(outbuf
, smb_vwv1
, chain_size
+ smb_wct
- 4);
1834 * Due to padding we have some uninitialized bytes after the
1838 memset(outbuf
+ outsize
, 0, padding
);
1841 smb_setlen(outbuf
, outsize2
+ caller_outputlen
+ padding
- 4);
1844 * restore the saved data, being careful not to overwrite any data
1845 * from the reply header
1847 memcpy(inbuf2
,inbuf_saved
,smb_wct
);
1849 SAFE_FREE(caller_output
);
1853 * Reset the chain_size for our caller's offset calculations
1856 chain_size
-= (outsize_padded
- smb_wct
);
1861 /****************************************************************************
1862 Check if services need reloading.
1863 ****************************************************************************/
1865 void check_reload(time_t t
)
1867 static pid_t mypid
= 0;
1868 static time_t last_smb_conf_reload_time
= 0;
1869 static time_t last_printer_reload_time
= 0;
1870 time_t printcap_cache_time
= (time_t)lp_printcap_cache_time();
1872 if(last_smb_conf_reload_time
== 0) {
1873 last_smb_conf_reload_time
= t
;
1874 /* Our printing subsystem might not be ready at smbd start up.
1875 Then no printer is available till the first printers check
1876 is performed. A lower initial interval circumvents this. */
1877 if ( printcap_cache_time
> 60 )
1878 last_printer_reload_time
= t
- printcap_cache_time
+ 60;
1880 last_printer_reload_time
= t
;
1883 if (mypid
!= getpid()) { /* First time or fork happened meanwhile */
1884 /* randomize over 60 second the printcap reload to avoid all
1885 * process hitting cupsd at the same time */
1886 int time_range
= 60;
1888 last_printer_reload_time
+= random() % time_range
;
1892 if (reload_after_sighup
|| (t
>= last_smb_conf_reload_time
+SMBD_RELOAD_CHECK
)) {
1893 reload_services(True
);
1894 reload_after_sighup
= False
;
1895 last_smb_conf_reload_time
= t
;
1898 /* 'printcap cache time = 0' disable the feature */
1900 if ( printcap_cache_time
!= 0 )
1902 /* see if it's time to reload or if the clock has been set back */
1904 if ( (t
>= last_printer_reload_time
+printcap_cache_time
)
1905 || (t
-last_printer_reload_time
< 0) )
1907 DEBUG( 3,( "Printcap cache time expired.\n"));
1909 last_printer_reload_time
= t
;
1914 /****************************************************************************
1915 Process commands from the client
1916 ****************************************************************************/
1918 void smbd_process(void)
1920 unsigned int num_smbs
= 0;
1921 size_t unread_bytes
= 0;
1923 char addr
[INET6_ADDRSTRLEN
];
1926 * Before the first packet, check the global hosts allow/ hosts deny
1927 * parameters before doing any parsing of packets passed to us by the
1928 * client. This prevents attacks on our parsing code from hosts not in
1929 * the hosts allow list.
1932 if (!check_access(smbd_server_fd(), lp_hostsallow(-1),
1933 lp_hostsdeny(-1))) {
1935 * send a negative session response "not listening on calling
1938 unsigned char buf
[5] = {0x83, 0, 0, 1, 0x81};
1939 DEBUG( 1, ("Connection denied from %s\n",
1940 client_addr(get_client_fd(),addr
,sizeof(addr
)) ) );
1941 (void)srv_send_smb(smbd_server_fd(),(char *)buf
,false);
1942 exit_server_cleanly("connection denied");
1945 max_recv
= MIN(lp_maxxmit(),BUFFER_SIZE
);
1950 size_t inbuf_len
= 0;
1951 bool encrypted
= false;
1952 TALLOC_CTX
*frame
= talloc_stackframe_pool(8192);
1956 run_events(smbd_event_context(), 0, NULL
, NULL
);
1958 status
= receive_message_or_smb(
1959 talloc_tos(), &inbuf
, &inbuf_len
,
1960 &unread_bytes
, &encrypted
);
1962 if (!NT_STATUS_IS_OK(status
)) {
1963 DEBUG(3, ("receive_message_or_smb failed: %s, "
1964 "exiting\n", nt_errstr(status
)));
1968 process_smb(inbuf
, inbuf_len
, unread_bytes
, encrypted
);
1974 /* The timeout_processing function isn't run nearly
1975 often enough to implement 'max log size' without
1976 overrunning the size of the file by many megabytes.
1977 This is especially true if we are running at debug
1978 level 10. Checking every 50 SMBs is a nice
1979 tradeoff of performance vs log file size overrun. */
1981 if ((num_smbs
% 50) == 0 && need_to_check_log_size()) {
1982 change_to_root_user();