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
;
25 static enum smb_read_errors smb_read_error
= SMB_READ_OK
;
28 * Size of data we can send to client. Set
29 * by the client for all protocols above CORE.
30 * Set by us for CORE protocol.
32 int max_send
= BUFFER_SIZE
;
34 * Size of the data we can receive. Set by us.
35 * Can be modified by the max xmit parameter.
37 int max_recv
= BUFFER_SIZE
;
39 SIG_ATOMIC_T reload_after_sighup
= 0;
40 SIG_ATOMIC_T got_sig_term
= 0;
41 extern bool global_machine_password_needs_changing
;
44 /* Accessor function for smb_read_error for smbd functions. */
46 enum smb_read_errors
*get_srv_read_error(void)
48 return &smb_read_error
;
51 /****************************************************************************
53 ****************************************************************************/
55 bool srv_send_smb(int fd
, char *buffer
, bool do_encrypt
)
60 char *buf_out
= buffer
;
62 /* Sign the outgoing packet if required. */
63 srv_calculate_sign_mac(buf_out
);
66 NTSTATUS status
= srv_encrypt_buffer(buffer
, &buf_out
);
67 if (!NT_STATUS_IS_OK(status
)) {
68 DEBUG(0, ("send_smb: SMB encryption failed "
69 "on outgoing packet! Error %s\n",
75 len
= smb_len(buf_out
) + 4;
77 while (nwritten
< len
) {
78 ret
= write_data(fd
,buf_out
+nwritten
,len
- nwritten
);
80 DEBUG(0,("Error writing %d bytes to client. %d. (%s)\n",
81 (int)len
,(int)ret
, strerror(errno
) ));
82 srv_free_enc_buffer(buf_out
);
88 srv_free_enc_buffer(buf_out
);
92 /*******************************************************************
93 Setup the word count and byte count for a smb message.
94 ********************************************************************/
96 int srv_set_message(char *buf
,
101 if (zero
&& (num_words
|| num_bytes
)) {
102 memset(buf
+ smb_size
,'\0',num_words
*2 + num_bytes
);
104 SCVAL(buf
,smb_wct
,num_words
);
105 SSVAL(buf
,smb_vwv
+ num_words
*SIZEOFWORD
,num_bytes
);
106 smb_setlen(buf
,(smb_size
+ num_words
*2 + num_bytes
- 4));
107 return (smb_size
+ num_words
*2 + num_bytes
);
110 static bool valid_smb_header(const uint8_t *inbuf
)
112 if (is_encrypted_packet(inbuf
)) {
115 return (strncmp(smb_base(inbuf
),"\377SMB",4) == 0);
118 /* Socket functions for smbd packet processing. */
120 static bool valid_packet_size(size_t len
)
123 * A WRITEX with CAP_LARGE_WRITEX can be 64k worth of data plus 65 bytes
124 * of header. Don't print the error if this fits.... JRA.
127 if (len
> (BUFFER_SIZE
+ LARGE_WRITEX_HDR_SIZE
)) {
128 DEBUG(0,("Invalid packet length! (%lu bytes).\n",
129 (unsigned long)len
));
130 if (len
> BUFFER_SIZE
+ (SAFETY_MARGIN
/2)) {
137 static NTSTATUS
read_packet_remainder(int fd
, char *buffer
,
138 unsigned int timeout
, ssize_t len
)
144 return read_socket_with_timeout_ntstatus(fd
, buffer
, len
, len
,
148 /****************************************************************************
149 Attempt a zerocopy writeX read. We know here that len > smb_size-4
150 ****************************************************************************/
153 * Unfortunately, earlier versions of smbclient/libsmbclient
154 * don't send this "standard" writeX header. I've fixed this
155 * for 3.2 but we'll use the old method with earlier versions.
156 * Windows and CIFSFS at least use this standard size. Not
160 #define STANDARD_WRITE_AND_X_HEADER_SIZE (smb_size - 4 + /* basic header */ \
161 (2*14) + /* word count (including bcc) */ \
164 static NTSTATUS
receive_smb_raw_talloc_partial_read(TALLOC_CTX
*mem_ctx
,
165 const char lenbuf
[4],
166 int fd
, char **buffer
,
167 unsigned int timeout
,
171 /* Size of a WRITEX call (+4 byte len). */
172 char writeX_header
[4 + STANDARD_WRITE_AND_X_HEADER_SIZE
];
173 ssize_t len
= smb_len_large(lenbuf
); /* Could be a UNIX large writeX. */
177 memcpy(writeX_header
, lenbuf
, sizeof(lenbuf
));
179 status
= read_socket_with_timeout_ntstatus(
180 fd
, writeX_header
+ 4,
181 STANDARD_WRITE_AND_X_HEADER_SIZE
,
182 STANDARD_WRITE_AND_X_HEADER_SIZE
,
185 if (!NT_STATUS_IS_OK(status
)) {
190 * Ok - now try and see if this is a possible
194 if (is_valid_writeX_buffer((uint8_t *)writeX_header
)) {
196 * If the data offset is beyond what
197 * we've read, drain the extra bytes.
199 uint16_t doff
= SVAL(writeX_header
,smb_vwv11
);
202 if (doff
> STANDARD_WRITE_AND_X_HEADER_SIZE
) {
203 size_t drain
= doff
- STANDARD_WRITE_AND_X_HEADER_SIZE
;
204 if (drain_socket(smbd_server_fd(), drain
) != drain
) {
205 smb_panic("receive_smb_raw_talloc_partial_read:"
206 " failed to drain pending bytes");
209 doff
= STANDARD_WRITE_AND_X_HEADER_SIZE
;
212 /* Spoof down the length and null out the bcc. */
213 set_message_bcc(writeX_header
, 0);
214 newlen
= smb_len(writeX_header
);
216 /* Copy the header we've written. */
218 *buffer
= (char *)TALLOC_MEMDUP(mem_ctx
,
220 sizeof(writeX_header
));
222 if (*buffer
== NULL
) {
223 DEBUG(0, ("Could not allocate inbuf of length %d\n",
224 (int)sizeof(writeX_header
)));
225 return NT_STATUS_NO_MEMORY
;
228 /* Work out the remaining bytes. */
229 *p_unread
= len
- STANDARD_WRITE_AND_X_HEADER_SIZE
;
230 *len_ret
= newlen
+ 4;
234 if (!valid_packet_size(len
)) {
235 return NT_STATUS_INVALID_PARAMETER
;
239 * Not a valid writeX call. Just do the standard
243 *buffer
= TALLOC_ARRAY(mem_ctx
, char, len
+4);
245 if (*buffer
== NULL
) {
246 DEBUG(0, ("Could not allocate inbuf of length %d\n",
248 return NT_STATUS_NO_MEMORY
;
251 /* Copy in what we already read. */
254 4 + STANDARD_WRITE_AND_X_HEADER_SIZE
);
255 toread
= len
- STANDARD_WRITE_AND_X_HEADER_SIZE
;
258 status
= read_packet_remainder(
259 fd
, (*buffer
) + 4 + STANDARD_WRITE_AND_X_HEADER_SIZE
,
262 if (!NT_STATUS_IS_OK(status
)) {
271 static ssize_t
receive_smb_raw_talloc(TALLOC_CTX
*mem_ctx
,
274 unsigned int timeout
,
279 int min_recv_size
= lp_min_receive_file_size();
282 set_smb_read_error(get_srv_read_error(),SMB_READ_OK
);
285 status
= read_smb_length_return_keepalive(fd
, lenbuf
, timeout
, &len
);
286 if (!NT_STATUS_IS_OK(status
)) {
287 DEBUG(10, ("receive_smb_raw: %s\n", nt_errstr(status
)));
289 if (NT_STATUS_EQUAL(status
, NT_STATUS_END_OF_FILE
)) {
290 set_smb_read_error(get_srv_read_error(), SMB_READ_EOF
);
294 if (NT_STATUS_EQUAL(status
, NT_STATUS_IO_TIMEOUT
)) {
295 set_smb_read_error(get_srv_read_error(),
300 set_smb_read_error(get_srv_read_error(), SMB_READ_ERROR
);
304 if (CVAL(lenbuf
,0) == 0 &&
306 smb_len_large(lenbuf
) > min_recv_size
&& /* Could be a UNIX large writeX. */
307 !srv_is_signing_active()) {
309 status
= receive_smb_raw_talloc_partial_read(
310 mem_ctx
, lenbuf
, fd
, buffer
, timeout
, p_unread
, &len
);
312 if (!NT_STATUS_IS_OK(status
)) {
314 DEBUG(10, ("receive_smb_raw: %s\n",
317 if (NT_STATUS_EQUAL(status
, NT_STATUS_END_OF_FILE
)) {
318 set_smb_read_error(get_srv_read_error(),
323 if (NT_STATUS_EQUAL(status
, NT_STATUS_IO_TIMEOUT
)) {
324 set_smb_read_error(get_srv_read_error(),
329 set_smb_read_error(get_srv_read_error(),
335 if (!valid_packet_size(len
)) {
336 cond_set_smb_read_error(get_srv_read_error(),SMB_READ_ERROR
);
341 * The +4 here can't wrap, we've checked the length above already.
344 *buffer
= TALLOC_ARRAY(mem_ctx
, char, len
+4);
346 if (*buffer
== NULL
) {
347 DEBUG(0, ("Could not allocate inbuf of length %d\n",
349 cond_set_smb_read_error(get_srv_read_error(),SMB_READ_ERROR
);
353 memcpy(*buffer
, lenbuf
, sizeof(lenbuf
));
355 status
= read_packet_remainder(fd
, (*buffer
)+4, timeout
, len
);
356 if (!NT_STATUS_IS_OK(status
)) {
357 if (NT_STATUS_EQUAL(status
, NT_STATUS_END_OF_FILE
)) {
358 set_smb_read_error(get_srv_read_error(),
363 if (NT_STATUS_EQUAL(status
, NT_STATUS_IO_TIMEOUT
)) {
364 set_smb_read_error(get_srv_read_error(),
369 set_smb_read_error(get_srv_read_error(),
377 static ssize_t
receive_smb_talloc(TALLOC_CTX
*mem_ctx
,
380 unsigned int timeout
,
386 *p_encrypted
= false;
388 len
= receive_smb_raw_talloc(mem_ctx
, fd
, buffer
, timeout
, p_unread
);
394 if (is_encrypted_packet((uint8_t *)*buffer
)) {
395 NTSTATUS status
= srv_decrypt_buffer(*buffer
);
396 if (!NT_STATUS_IS_OK(status
)) {
397 DEBUG(0, ("receive_smb_talloc: SMB decryption failed on "
398 "incoming packet! Error %s\n",
399 nt_errstr(status
) ));
400 cond_set_smb_read_error(get_srv_read_error(),
401 SMB_READ_BAD_DECRYPT
);
407 /* Check the incoming SMB signature. */
408 if (!srv_check_sign_mac(*buffer
, true)) {
409 DEBUG(0, ("receive_smb: SMB Signature verification failed on "
410 "incoming packet!\n"));
411 cond_set_smb_read_error(get_srv_read_error(),SMB_READ_BAD_SIG
);
419 * Initialize a struct smb_request from an inbuf
422 void init_smb_request(struct smb_request
*req
,
427 size_t req_size
= smb_len(inbuf
) + 4;
428 /* Ensure we have at least smb_size bytes. */
429 if (req_size
< smb_size
) {
430 DEBUG(0,("init_smb_request: invalid request size %u\n",
431 (unsigned int)req_size
));
432 exit_server_cleanly("Invalid SMB request");
434 req
->flags2
= SVAL(inbuf
, smb_flg2
);
435 req
->smbpid
= SVAL(inbuf
, smb_pid
);
436 req
->mid
= SVAL(inbuf
, smb_mid
);
437 req
->vuid
= SVAL(inbuf
, smb_uid
);
438 req
->tid
= SVAL(inbuf
, smb_tid
);
439 req
->wct
= CVAL(inbuf
, smb_wct
);
440 req
->unread_bytes
= unread_bytes
;
441 req
->encrypted
= encrypted
;
442 req
->conn
= conn_find(req
->tid
);
444 /* Ensure we have at least wct words and 2 bytes of bcc. */
445 if (smb_size
+ req
->wct
*2 > req_size
) {
446 DEBUG(0,("init_smb_request: invalid wct number %u (size %u)\n",
447 (unsigned int)req
->wct
,
448 (unsigned int)req_size
));
449 exit_server_cleanly("Invalid SMB request");
451 /* Ensure bcc is correct. */
452 if (((uint8
*)smb_buf(inbuf
)) + smb_buflen(inbuf
) > inbuf
+ req_size
) {
453 DEBUG(0,("init_smb_request: invalid bcc number %u "
454 "(wct = %u, size %u)\n",
455 (unsigned int)smb_buflen(inbuf
),
456 (unsigned int)req
->wct
,
457 (unsigned int)req_size
));
458 exit_server_cleanly("Invalid SMB request");
464 /****************************************************************************
465 structure to hold a linked list of queued messages.
467 ****************************************************************************/
469 static struct pending_message_list
*deferred_open_queue
;
471 /****************************************************************************
472 Function to push a message onto the tail of a linked list of smb messages ready
474 ****************************************************************************/
476 static bool push_queued_message(struct smb_request
*req
,
477 struct timeval request_time
,
478 struct timeval end_time
,
479 char *private_data
, size_t private_len
)
481 int msg_len
= smb_len(req
->inbuf
) + 4;
482 struct pending_message_list
*msg
;
484 msg
= TALLOC_ZERO_P(NULL
, struct pending_message_list
);
487 DEBUG(0,("push_message: malloc fail (1)\n"));
491 msg
->buf
= data_blob_talloc(msg
, req
->inbuf
, msg_len
);
492 if(msg
->buf
.data
== NULL
) {
493 DEBUG(0,("push_message: malloc fail (2)\n"));
498 msg
->request_time
= request_time
;
499 msg
->end_time
= end_time
;
500 msg
->encrypted
= req
->encrypted
;
503 msg
->private_data
= data_blob_talloc(msg
, private_data
,
505 if (msg
->private_data
.data
== NULL
) {
506 DEBUG(0,("push_message: malloc fail (3)\n"));
512 DLIST_ADD_END(deferred_open_queue
, msg
, struct pending_message_list
*);
514 DEBUG(10,("push_message: pushed message length %u on "
515 "deferred_open_queue\n", (unsigned int)msg_len
));
520 /****************************************************************************
521 Function to delete a sharing violation open message by mid.
522 ****************************************************************************/
524 void remove_deferred_open_smb_message(uint16 mid
)
526 struct pending_message_list
*pml
;
528 for (pml
= deferred_open_queue
; pml
; pml
= pml
->next
) {
529 if (mid
== SVAL(pml
->buf
.data
,smb_mid
)) {
530 DEBUG(10,("remove_sharing_violation_open_smb_message: "
531 "deleting mid %u len %u\n",
533 (unsigned int)pml
->buf
.length
));
534 DLIST_REMOVE(deferred_open_queue
, pml
);
541 /****************************************************************************
542 Move a sharing violation open retry message to the front of the list and
543 schedule it for immediate processing.
544 ****************************************************************************/
546 void schedule_deferred_open_smb_message(uint16 mid
)
548 struct pending_message_list
*pml
;
551 for (pml
= deferred_open_queue
; pml
; pml
= pml
->next
) {
552 uint16 msg_mid
= SVAL(pml
->buf
.data
,smb_mid
);
553 DEBUG(10,("schedule_deferred_open_smb_message: [%d] msg_mid = %u\n", i
++,
554 (unsigned int)msg_mid
));
555 if (mid
== msg_mid
) {
556 DEBUG(10,("schedule_deferred_open_smb_message: scheduling mid %u\n",
558 pml
->end_time
.tv_sec
= 0;
559 pml
->end_time
.tv_usec
= 0;
560 DLIST_PROMOTE(deferred_open_queue
, pml
);
565 DEBUG(10,("schedule_deferred_open_smb_message: failed to find message mid %u\n",
569 /****************************************************************************
570 Return true if this mid is on the deferred queue.
571 ****************************************************************************/
573 bool open_was_deferred(uint16 mid
)
575 struct pending_message_list
*pml
;
577 for (pml
= deferred_open_queue
; pml
; pml
= pml
->next
) {
578 if (SVAL(pml
->buf
.data
,smb_mid
) == mid
) {
585 /****************************************************************************
586 Return the message queued by this mid.
587 ****************************************************************************/
589 struct pending_message_list
*get_open_deferred_message(uint16 mid
)
591 struct pending_message_list
*pml
;
593 for (pml
= deferred_open_queue
; pml
; pml
= pml
->next
) {
594 if (SVAL(pml
->buf
.data
,smb_mid
) == mid
) {
601 /****************************************************************************
602 Function to push a deferred open smb message onto a linked list of local smb
603 messages ready for processing.
604 ****************************************************************************/
606 bool push_deferred_smb_message(struct smb_request
*req
,
607 struct timeval request_time
,
608 struct timeval timeout
,
609 char *private_data
, size_t priv_len
)
611 struct timeval end_time
;
613 if (req
->unread_bytes
) {
614 DEBUG(0,("push_deferred_smb_message: logic error ! "
615 "unread_bytes = %u\n",
616 (unsigned int)req
->unread_bytes
));
617 smb_panic("push_deferred_smb_message: "
618 "logic error unread_bytes != 0" );
621 end_time
= timeval_sum(&request_time
, &timeout
);
623 DEBUG(10,("push_deferred_open_smb_message: pushing message len %u mid %u "
624 "timeout time [%u.%06u]\n",
625 (unsigned int) smb_len(req
->inbuf
)+4, (unsigned int)req
->mid
,
626 (unsigned int)end_time
.tv_sec
,
627 (unsigned int)end_time
.tv_usec
));
629 return push_queued_message(req
, request_time
, end_time
,
630 private_data
, priv_len
);
634 struct timed_event
*te
;
635 struct timeval interval
;
637 bool (*handler
)(const struct timeval
*now
, void *private_data
);
641 static void idle_event_handler(struct event_context
*ctx
,
642 struct timed_event
*te
,
643 const struct timeval
*now
,
646 struct idle_event
*event
=
647 talloc_get_type_abort(private_data
, struct idle_event
);
649 TALLOC_FREE(event
->te
);
651 if (!event
->handler(now
, event
->private_data
)) {
652 /* Don't repeat, delete ourselves */
657 event
->te
= event_add_timed(ctx
, event
,
658 timeval_sum(now
, &event
->interval
),
660 idle_event_handler
, event
);
662 /* We can't do much but fail here. */
663 SMB_ASSERT(event
->te
!= NULL
);
666 struct idle_event
*event_add_idle(struct event_context
*event_ctx
,
668 struct timeval interval
,
670 bool (*handler
)(const struct timeval
*now
,
674 struct idle_event
*result
;
675 struct timeval now
= timeval_current();
677 result
= TALLOC_P(mem_ctx
, struct idle_event
);
678 if (result
== NULL
) {
679 DEBUG(0, ("talloc failed\n"));
683 result
->interval
= interval
;
684 result
->handler
= handler
;
685 result
->private_data
= private_data
;
687 if (!(result
->name
= talloc_asprintf(result
, "idle_evt(%s)", name
))) {
688 DEBUG(0, ("talloc failed\n"));
693 result
->te
= event_add_timed(event_ctx
, result
,
694 timeval_sum(&now
, &interval
),
696 idle_event_handler
, result
);
697 if (result
->te
== NULL
) {
698 DEBUG(0, ("event_add_timed failed\n"));
706 /****************************************************************************
707 Do all async processing in here. This includes kernel oplock messages, change
709 ****************************************************************************/
711 static void async_processing(fd_set
*pfds
)
713 DEBUG(10,("async_processing: Doing async processing.\n"));
717 process_kernel_oplocks(smbd_messaging_context(), pfds
);
719 /* Do the aio check again after receive_local_message as it does a
720 select and may have eaten our signal. */
721 /* Is this till true? -- vl */
725 exit_server_cleanly("termination signal");
728 /* check for sighup processing */
729 if (reload_after_sighup
) {
730 change_to_root_user();
731 DEBUG(1,("Reloading services after SIGHUP\n"));
732 reload_services(False
);
733 reload_after_sighup
= 0;
737 /****************************************************************************
738 Add a fd to the set we will be select(2)ing on.
739 ****************************************************************************/
741 static int select_on_fd(int fd
, int maxfd
, fd_set
*fds
)
745 maxfd
= MAX(maxfd
, fd
);
751 /****************************************************************************
752 Do a select on an two fd's - with timeout.
754 If a local udp message has been pushed onto the
755 queue (this can only happen during oplock break
756 processing) call async_processing()
758 If a pending smb message has been pushed onto the
759 queue (this can only happen during oplock break
760 processing) return this next.
762 If the first smbfd is ready then read an smb from it.
763 if the second (loopback UDP) fd is ready then read a message
764 from it and setup the buffer header to identify the length
766 Returns False on timeout or error.
769 The timeout is in milliseconds
770 ****************************************************************************/
772 static bool receive_message_or_smb(TALLOC_CTX
*mem_ctx
,
786 set_smb_read_error(get_srv_read_error(),SMB_READ_OK
);
791 to
.tv_sec
= timeout
/ 1000;
792 to
.tv_usec
= (timeout
% 1000) * 1000;
794 to
.tv_sec
= SMBD_SELECT_TIMEOUT
;
799 * Note that this call must be before processing any SMB
800 * messages as we need to synchronously process any messages
801 * we may have sent to ourselves from the previous SMB.
803 message_dispatch(smbd_messaging_context());
806 * Check to see if we already have a message on the deferred open queue
807 * and it's time to schedule.
809 if(deferred_open_queue
!= NULL
) {
810 bool pop_message
= False
;
811 struct pending_message_list
*msg
= deferred_open_queue
;
813 if (timeval_is_zero(&msg
->end_time
)) {
820 tdif
= usec_time_diff(&msg
->end_time
, &tv
);
822 /* Timed out. Schedule...*/
824 DEBUG(10,("receive_message_or_smb: queued message timed out.\n"));
826 /* Make a more accurate select timeout. */
827 to
.tv_sec
= tdif
/ 1000000;
828 to
.tv_usec
= tdif
% 1000000;
829 DEBUG(10,("receive_message_or_smb: select with timeout of [%u.%06u]\n",
830 (unsigned int)to
.tv_sec
, (unsigned int)to
.tv_usec
));
836 *buffer
= (char *)talloc_memdup(mem_ctx
, msg
->buf
.data
,
838 if (*buffer
== NULL
) {
839 DEBUG(0, ("talloc failed\n"));
840 set_smb_read_error(get_srv_read_error(),SMB_READ_ERROR
);
843 *buffer_len
= msg
->buf
.length
;
844 *p_encrypted
= msg
->encrypted
;
846 /* We leave this message on the queue so the open code can
847 know this is a retry. */
848 DEBUG(5,("receive_message_or_smb: returning deferred open smb message.\n"));
854 * Setup the select fd sets.
861 * Ensure we process oplock break messages by preference.
862 * We have to do this before the select, after the select
863 * and if the select returns EINTR. This is due to the fact
864 * that the selects called from async_processing can eat an EINTR
865 * caused by a signal (we can't take the break message there).
866 * This is hideously complex - *MUST* be simplified for 3.0 ! JRA.
869 if (oplock_message_waiting(&r_fds
)) {
870 DEBUG(10,("receive_message_or_smb: oplock_message is waiting.\n"));
871 async_processing(&r_fds
);
873 * After async processing we must go and do the select again, as
874 * the state of the flag in fds for the server file descriptor is
875 * indeterminate - we may have done I/O on it in the oplock processing. JRA.
881 * Are there any timed events waiting ? If so, ensure we don't
882 * select for longer than it would take to wait for them.
889 event_add_to_select_args(smbd_event_context(), &now
,
890 &r_fds
, &w_fds
, &to
, &maxfd
);
893 if (timeval_is_zero(&to
)) {
894 /* Process a timed event now... */
895 if (run_events(smbd_event_context(), 0, NULL
, NULL
)) {
902 START_PROFILE(smbd_idle
);
904 maxfd
= select_on_fd(smbd_server_fd(), maxfd
, &r_fds
);
905 maxfd
= select_on_fd(oplock_notify_fd(), maxfd
, &r_fds
);
907 selrtn
= sys_select(maxfd
+1,&r_fds
,&w_fds
,NULL
,&to
);
910 END_PROFILE(smbd_idle
);
914 if (run_events(smbd_event_context(), selrtn
, &r_fds
, &w_fds
)) {
918 /* if we get EINTR then maybe we have received an oplock
919 signal - treat this as select returning 1. This is ugly, but
920 is the best we can do until the oplock code knows more about
922 if (selrtn
== -1 && errno
== EINTR
) {
923 async_processing(&r_fds
);
925 * After async processing we must go and do the select again, as
926 * the state of the flag in fds for the server file descriptor is
927 * indeterminate - we may have done I/O on it in the oplock processing. JRA.
934 /* something is wrong. Maybe the socket is dead? */
935 set_smb_read_error(get_srv_read_error(),SMB_READ_ERROR
);
939 /* Did we timeout ? */
941 set_smb_read_error(get_srv_read_error(),SMB_READ_TIMEOUT
);
946 * Ensure we process oplock break messages by preference.
947 * This is IMPORTANT ! Otherwise we can starve other processes
948 * sending us an oplock break message. JRA.
951 if (oplock_message_waiting(&r_fds
)) {
952 async_processing(&r_fds
);
954 * After async processing we must go and do the select again, as
955 * the state of the flag in fds for the server file descriptor is
956 * indeterminate - we may have done I/O on it in the oplock processing. JRA.
961 len
= receive_smb_talloc(mem_ctx
, smbd_server_fd(),
962 buffer
, 0, p_unread
, p_encrypted
);
968 *buffer_len
= (size_t)len
;
974 * Only allow 5 outstanding trans requests. We're allocating memory, so
978 NTSTATUS
allow_new_trans(struct trans_state
*list
, int mid
)
981 for (; list
!= NULL
; list
= list
->next
) {
983 if (list
->mid
== mid
) {
984 return NT_STATUS_INVALID_PARAMETER
;
990 return NT_STATUS_INSUFFICIENT_RESOURCES
;
996 /****************************************************************************
997 We're terminating and have closed all our files/connections etc.
998 If there are any pending local messages we need to respond to them
999 before termination so that other smbds don't think we just died whilst
1001 ****************************************************************************/
1003 void respond_to_all_remaining_local_messages(void)
1006 * Assert we have no exclusive open oplocks.
1009 if(get_number_of_exclusive_open_oplocks()) {
1010 DEBUG(0,("respond_to_all_remaining_local_messages: PANIC : we have %d exclusive oplocks.\n",
1011 get_number_of_exclusive_open_oplocks() ));
1015 process_kernel_oplocks(smbd_messaging_context(), NULL
);
1022 These flags determine some of the permissions required to do an operation
1024 Note that I don't set NEED_WRITE on some write operations because they
1025 are used by some brain-dead clients when printing, and I don't want to
1026 force write permissions on print services.
1028 #define AS_USER (1<<0)
1029 #define NEED_WRITE (1<<1) /* Must be paired with AS_USER */
1030 #define TIME_INIT (1<<2)
1031 #define CAN_IPC (1<<3) /* Must be paired with AS_USER */
1032 #define AS_GUEST (1<<5) /* Must *NOT* be paired with AS_USER */
1033 #define DO_CHDIR (1<<6)
1036 define a list of possible SMB messages and their corresponding
1037 functions. Any message that has a NULL function is unimplemented -
1038 please feel free to contribute implementations!
1040 static const struct smb_message_struct
{
1042 void (*fn_new
)(struct smb_request
*req
);
1044 } smb_messages
[256] = {
1046 /* 0x00 */ { "SMBmkdir",reply_mkdir
,AS_USER
| NEED_WRITE
},
1047 /* 0x01 */ { "SMBrmdir",reply_rmdir
,AS_USER
| NEED_WRITE
},
1048 /* 0x02 */ { "SMBopen",reply_open
,AS_USER
},
1049 /* 0x03 */ { "SMBcreate",reply_mknew
,AS_USER
},
1050 /* 0x04 */ { "SMBclose",reply_close
,AS_USER
| CAN_IPC
},
1051 /* 0x05 */ { "SMBflush",reply_flush
,AS_USER
},
1052 /* 0x06 */ { "SMBunlink",reply_unlink
,AS_USER
| NEED_WRITE
},
1053 /* 0x07 */ { "SMBmv",reply_mv
,AS_USER
| NEED_WRITE
},
1054 /* 0x08 */ { "SMBgetatr",reply_getatr
,AS_USER
},
1055 /* 0x09 */ { "SMBsetatr",reply_setatr
,AS_USER
| NEED_WRITE
},
1056 /* 0x0a */ { "SMBread",reply_read
,AS_USER
},
1057 /* 0x0b */ { "SMBwrite",reply_write
,AS_USER
| CAN_IPC
},
1058 /* 0x0c */ { "SMBlock",reply_lock
,AS_USER
},
1059 /* 0x0d */ { "SMBunlock",reply_unlock
,AS_USER
},
1060 /* 0x0e */ { "SMBctemp",reply_ctemp
,AS_USER
},
1061 /* 0x0f */ { "SMBmknew",reply_mknew
,AS_USER
},
1062 /* 0x10 */ { "SMBcheckpath",reply_checkpath
,AS_USER
},
1063 /* 0x11 */ { "SMBexit",reply_exit
,DO_CHDIR
},
1064 /* 0x12 */ { "SMBlseek",reply_lseek
,AS_USER
},
1065 /* 0x13 */ { "SMBlockread",reply_lockread
,AS_USER
},
1066 /* 0x14 */ { "SMBwriteunlock",reply_writeunlock
,AS_USER
},
1067 /* 0x15 */ { NULL
, NULL
, 0 },
1068 /* 0x16 */ { NULL
, NULL
, 0 },
1069 /* 0x17 */ { NULL
, NULL
, 0 },
1070 /* 0x18 */ { NULL
, NULL
, 0 },
1071 /* 0x19 */ { NULL
, NULL
, 0 },
1072 /* 0x1a */ { "SMBreadbraw",reply_readbraw
,AS_USER
},
1073 /* 0x1b */ { "SMBreadBmpx",reply_readbmpx
,AS_USER
},
1074 /* 0x1c */ { "SMBreadBs",reply_readbs
,AS_USER
},
1075 /* 0x1d */ { "SMBwritebraw",reply_writebraw
,AS_USER
},
1076 /* 0x1e */ { "SMBwriteBmpx",reply_writebmpx
,AS_USER
},
1077 /* 0x1f */ { "SMBwriteBs",reply_writebs
,AS_USER
},
1078 /* 0x20 */ { "SMBwritec", NULL
,0},
1079 /* 0x21 */ { NULL
, NULL
, 0 },
1080 /* 0x22 */ { "SMBsetattrE",reply_setattrE
,AS_USER
| NEED_WRITE
},
1081 /* 0x23 */ { "SMBgetattrE",reply_getattrE
,AS_USER
},
1082 /* 0x24 */ { "SMBlockingX",reply_lockingX
,AS_USER
},
1083 /* 0x25 */ { "SMBtrans",reply_trans
,AS_USER
| CAN_IPC
},
1084 /* 0x26 */ { "SMBtranss",reply_transs
,AS_USER
| CAN_IPC
},
1085 /* 0x27 */ { "SMBioctl",reply_ioctl
,0},
1086 /* 0x28 */ { "SMBioctls", NULL
,AS_USER
},
1087 /* 0x29 */ { "SMBcopy",reply_copy
,AS_USER
| NEED_WRITE
},
1088 /* 0x2a */ { "SMBmove", NULL
,AS_USER
| NEED_WRITE
},
1089 /* 0x2b */ { "SMBecho",reply_echo
,0},
1090 /* 0x2c */ { "SMBwriteclose",reply_writeclose
,AS_USER
},
1091 /* 0x2d */ { "SMBopenX",reply_open_and_X
,AS_USER
| CAN_IPC
},
1092 /* 0x2e */ { "SMBreadX",reply_read_and_X
,AS_USER
| CAN_IPC
},
1093 /* 0x2f */ { "SMBwriteX",reply_write_and_X
,AS_USER
| CAN_IPC
},
1094 /* 0x30 */ { NULL
, NULL
, 0 },
1095 /* 0x31 */ { NULL
, NULL
, 0 },
1096 /* 0x32 */ { "SMBtrans2",reply_trans2
, AS_USER
| CAN_IPC
},
1097 /* 0x33 */ { "SMBtranss2",reply_transs2
, AS_USER
},
1098 /* 0x34 */ { "SMBfindclose",reply_findclose
,AS_USER
},
1099 /* 0x35 */ { "SMBfindnclose",reply_findnclose
,AS_USER
},
1100 /* 0x36 */ { NULL
, NULL
, 0 },
1101 /* 0x37 */ { NULL
, NULL
, 0 },
1102 /* 0x38 */ { NULL
, NULL
, 0 },
1103 /* 0x39 */ { NULL
, NULL
, 0 },
1104 /* 0x3a */ { NULL
, NULL
, 0 },
1105 /* 0x3b */ { NULL
, NULL
, 0 },
1106 /* 0x3c */ { NULL
, NULL
, 0 },
1107 /* 0x3d */ { NULL
, NULL
, 0 },
1108 /* 0x3e */ { NULL
, NULL
, 0 },
1109 /* 0x3f */ { NULL
, NULL
, 0 },
1110 /* 0x40 */ { NULL
, NULL
, 0 },
1111 /* 0x41 */ { NULL
, NULL
, 0 },
1112 /* 0x42 */ { NULL
, NULL
, 0 },
1113 /* 0x43 */ { NULL
, NULL
, 0 },
1114 /* 0x44 */ { NULL
, NULL
, 0 },
1115 /* 0x45 */ { NULL
, NULL
, 0 },
1116 /* 0x46 */ { NULL
, NULL
, 0 },
1117 /* 0x47 */ { NULL
, NULL
, 0 },
1118 /* 0x48 */ { NULL
, NULL
, 0 },
1119 /* 0x49 */ { NULL
, NULL
, 0 },
1120 /* 0x4a */ { NULL
, NULL
, 0 },
1121 /* 0x4b */ { NULL
, NULL
, 0 },
1122 /* 0x4c */ { NULL
, NULL
, 0 },
1123 /* 0x4d */ { NULL
, NULL
, 0 },
1124 /* 0x4e */ { NULL
, NULL
, 0 },
1125 /* 0x4f */ { NULL
, NULL
, 0 },
1126 /* 0x50 */ { NULL
, NULL
, 0 },
1127 /* 0x51 */ { NULL
, NULL
, 0 },
1128 /* 0x52 */ { NULL
, NULL
, 0 },
1129 /* 0x53 */ { NULL
, NULL
, 0 },
1130 /* 0x54 */ { NULL
, NULL
, 0 },
1131 /* 0x55 */ { NULL
, NULL
, 0 },
1132 /* 0x56 */ { NULL
, NULL
, 0 },
1133 /* 0x57 */ { NULL
, NULL
, 0 },
1134 /* 0x58 */ { NULL
, NULL
, 0 },
1135 /* 0x59 */ { NULL
, NULL
, 0 },
1136 /* 0x5a */ { NULL
, NULL
, 0 },
1137 /* 0x5b */ { NULL
, NULL
, 0 },
1138 /* 0x5c */ { NULL
, NULL
, 0 },
1139 /* 0x5d */ { NULL
, NULL
, 0 },
1140 /* 0x5e */ { NULL
, NULL
, 0 },
1141 /* 0x5f */ { NULL
, NULL
, 0 },
1142 /* 0x60 */ { NULL
, NULL
, 0 },
1143 /* 0x61 */ { NULL
, NULL
, 0 },
1144 /* 0x62 */ { NULL
, NULL
, 0 },
1145 /* 0x63 */ { NULL
, NULL
, 0 },
1146 /* 0x64 */ { NULL
, NULL
, 0 },
1147 /* 0x65 */ { NULL
, NULL
, 0 },
1148 /* 0x66 */ { NULL
, NULL
, 0 },
1149 /* 0x67 */ { NULL
, NULL
, 0 },
1150 /* 0x68 */ { NULL
, NULL
, 0 },
1151 /* 0x69 */ { NULL
, NULL
, 0 },
1152 /* 0x6a */ { NULL
, NULL
, 0 },
1153 /* 0x6b */ { NULL
, NULL
, 0 },
1154 /* 0x6c */ { NULL
, NULL
, 0 },
1155 /* 0x6d */ { NULL
, NULL
, 0 },
1156 /* 0x6e */ { NULL
, NULL
, 0 },
1157 /* 0x6f */ { NULL
, NULL
, 0 },
1158 /* 0x70 */ { "SMBtcon",reply_tcon
,0},
1159 /* 0x71 */ { "SMBtdis",reply_tdis
,DO_CHDIR
},
1160 /* 0x72 */ { "SMBnegprot",reply_negprot
,0},
1161 /* 0x73 */ { "SMBsesssetupX",reply_sesssetup_and_X
,0},
1162 /* 0x74 */ { "SMBulogoffX",reply_ulogoffX
, 0}, /* ulogoff doesn't give a valid TID */
1163 /* 0x75 */ { "SMBtconX",reply_tcon_and_X
,0},
1164 /* 0x76 */ { NULL
, NULL
, 0 },
1165 /* 0x77 */ { NULL
, NULL
, 0 },
1166 /* 0x78 */ { NULL
, NULL
, 0 },
1167 /* 0x79 */ { NULL
, NULL
, 0 },
1168 /* 0x7a */ { NULL
, NULL
, 0 },
1169 /* 0x7b */ { NULL
, NULL
, 0 },
1170 /* 0x7c */ { NULL
, NULL
, 0 },
1171 /* 0x7d */ { NULL
, NULL
, 0 },
1172 /* 0x7e */ { NULL
, NULL
, 0 },
1173 /* 0x7f */ { NULL
, NULL
, 0 },
1174 /* 0x80 */ { "SMBdskattr",reply_dskattr
,AS_USER
},
1175 /* 0x81 */ { "SMBsearch",reply_search
,AS_USER
},
1176 /* 0x82 */ { "SMBffirst",reply_search
,AS_USER
},
1177 /* 0x83 */ { "SMBfunique",reply_search
,AS_USER
},
1178 /* 0x84 */ { "SMBfclose",reply_fclose
,AS_USER
},
1179 /* 0x85 */ { NULL
, NULL
, 0 },
1180 /* 0x86 */ { NULL
, NULL
, 0 },
1181 /* 0x87 */ { NULL
, NULL
, 0 },
1182 /* 0x88 */ { NULL
, NULL
, 0 },
1183 /* 0x89 */ { NULL
, NULL
, 0 },
1184 /* 0x8a */ { NULL
, NULL
, 0 },
1185 /* 0x8b */ { NULL
, NULL
, 0 },
1186 /* 0x8c */ { NULL
, NULL
, 0 },
1187 /* 0x8d */ { NULL
, NULL
, 0 },
1188 /* 0x8e */ { NULL
, NULL
, 0 },
1189 /* 0x8f */ { NULL
, NULL
, 0 },
1190 /* 0x90 */ { NULL
, NULL
, 0 },
1191 /* 0x91 */ { NULL
, NULL
, 0 },
1192 /* 0x92 */ { NULL
, NULL
, 0 },
1193 /* 0x93 */ { NULL
, NULL
, 0 },
1194 /* 0x94 */ { NULL
, NULL
, 0 },
1195 /* 0x95 */ { NULL
, NULL
, 0 },
1196 /* 0x96 */ { NULL
, NULL
, 0 },
1197 /* 0x97 */ { NULL
, NULL
, 0 },
1198 /* 0x98 */ { NULL
, NULL
, 0 },
1199 /* 0x99 */ { NULL
, NULL
, 0 },
1200 /* 0x9a */ { NULL
, NULL
, 0 },
1201 /* 0x9b */ { NULL
, NULL
, 0 },
1202 /* 0x9c */ { NULL
, NULL
, 0 },
1203 /* 0x9d */ { NULL
, NULL
, 0 },
1204 /* 0x9e */ { NULL
, NULL
, 0 },
1205 /* 0x9f */ { NULL
, NULL
, 0 },
1206 /* 0xa0 */ { "SMBnttrans",reply_nttrans
, AS_USER
| CAN_IPC
},
1207 /* 0xa1 */ { "SMBnttranss",reply_nttranss
, AS_USER
| CAN_IPC
},
1208 /* 0xa2 */ { "SMBntcreateX",reply_ntcreate_and_X
, AS_USER
| CAN_IPC
},
1209 /* 0xa3 */ { NULL
, NULL
, 0 },
1210 /* 0xa4 */ { "SMBntcancel",reply_ntcancel
, 0 },
1211 /* 0xa5 */ { "SMBntrename",reply_ntrename
, AS_USER
| NEED_WRITE
},
1212 /* 0xa6 */ { NULL
, NULL
, 0 },
1213 /* 0xa7 */ { NULL
, NULL
, 0 },
1214 /* 0xa8 */ { NULL
, NULL
, 0 },
1215 /* 0xa9 */ { NULL
, NULL
, 0 },
1216 /* 0xaa */ { NULL
, NULL
, 0 },
1217 /* 0xab */ { NULL
, NULL
, 0 },
1218 /* 0xac */ { NULL
, NULL
, 0 },
1219 /* 0xad */ { NULL
, NULL
, 0 },
1220 /* 0xae */ { NULL
, NULL
, 0 },
1221 /* 0xaf */ { NULL
, NULL
, 0 },
1222 /* 0xb0 */ { NULL
, NULL
, 0 },
1223 /* 0xb1 */ { NULL
, NULL
, 0 },
1224 /* 0xb2 */ { NULL
, NULL
, 0 },
1225 /* 0xb3 */ { NULL
, NULL
, 0 },
1226 /* 0xb4 */ { NULL
, NULL
, 0 },
1227 /* 0xb5 */ { NULL
, NULL
, 0 },
1228 /* 0xb6 */ { NULL
, NULL
, 0 },
1229 /* 0xb7 */ { NULL
, NULL
, 0 },
1230 /* 0xb8 */ { NULL
, NULL
, 0 },
1231 /* 0xb9 */ { NULL
, NULL
, 0 },
1232 /* 0xba */ { NULL
, NULL
, 0 },
1233 /* 0xbb */ { NULL
, NULL
, 0 },
1234 /* 0xbc */ { NULL
, NULL
, 0 },
1235 /* 0xbd */ { NULL
, NULL
, 0 },
1236 /* 0xbe */ { NULL
, NULL
, 0 },
1237 /* 0xbf */ { NULL
, NULL
, 0 },
1238 /* 0xc0 */ { "SMBsplopen",reply_printopen
,AS_USER
},
1239 /* 0xc1 */ { "SMBsplwr",reply_printwrite
,AS_USER
},
1240 /* 0xc2 */ { "SMBsplclose",reply_printclose
,AS_USER
},
1241 /* 0xc3 */ { "SMBsplretq",reply_printqueue
,AS_USER
},
1242 /* 0xc4 */ { NULL
, NULL
, 0 },
1243 /* 0xc5 */ { NULL
, NULL
, 0 },
1244 /* 0xc6 */ { NULL
, NULL
, 0 },
1245 /* 0xc7 */ { NULL
, NULL
, 0 },
1246 /* 0xc8 */ { NULL
, NULL
, 0 },
1247 /* 0xc9 */ { NULL
, NULL
, 0 },
1248 /* 0xca */ { NULL
, NULL
, 0 },
1249 /* 0xcb */ { NULL
, NULL
, 0 },
1250 /* 0xcc */ { NULL
, NULL
, 0 },
1251 /* 0xcd */ { NULL
, NULL
, 0 },
1252 /* 0xce */ { NULL
, NULL
, 0 },
1253 /* 0xcf */ { NULL
, NULL
, 0 },
1254 /* 0xd0 */ { "SMBsends",reply_sends
,AS_GUEST
},
1255 /* 0xd1 */ { "SMBsendb", NULL
,AS_GUEST
},
1256 /* 0xd2 */ { "SMBfwdname", NULL
,AS_GUEST
},
1257 /* 0xd3 */ { "SMBcancelf", NULL
,AS_GUEST
},
1258 /* 0xd4 */ { "SMBgetmac", NULL
,AS_GUEST
},
1259 /* 0xd5 */ { "SMBsendstrt",reply_sendstrt
,AS_GUEST
},
1260 /* 0xd6 */ { "SMBsendend",reply_sendend
,AS_GUEST
},
1261 /* 0xd7 */ { "SMBsendtxt",reply_sendtxt
,AS_GUEST
},
1262 /* 0xd8 */ { NULL
, NULL
, 0 },
1263 /* 0xd9 */ { NULL
, NULL
, 0 },
1264 /* 0xda */ { NULL
, NULL
, 0 },
1265 /* 0xdb */ { NULL
, NULL
, 0 },
1266 /* 0xdc */ { NULL
, NULL
, 0 },
1267 /* 0xdd */ { NULL
, NULL
, 0 },
1268 /* 0xde */ { NULL
, NULL
, 0 },
1269 /* 0xdf */ { NULL
, NULL
, 0 },
1270 /* 0xe0 */ { NULL
, NULL
, 0 },
1271 /* 0xe1 */ { NULL
, NULL
, 0 },
1272 /* 0xe2 */ { NULL
, NULL
, 0 },
1273 /* 0xe3 */ { NULL
, NULL
, 0 },
1274 /* 0xe4 */ { NULL
, NULL
, 0 },
1275 /* 0xe5 */ { NULL
, NULL
, 0 },
1276 /* 0xe6 */ { NULL
, NULL
, 0 },
1277 /* 0xe7 */ { NULL
, NULL
, 0 },
1278 /* 0xe8 */ { NULL
, NULL
, 0 },
1279 /* 0xe9 */ { NULL
, NULL
, 0 },
1280 /* 0xea */ { NULL
, NULL
, 0 },
1281 /* 0xeb */ { NULL
, NULL
, 0 },
1282 /* 0xec */ { NULL
, NULL
, 0 },
1283 /* 0xed */ { NULL
, NULL
, 0 },
1284 /* 0xee */ { NULL
, NULL
, 0 },
1285 /* 0xef */ { NULL
, NULL
, 0 },
1286 /* 0xf0 */ { NULL
, NULL
, 0 },
1287 /* 0xf1 */ { NULL
, NULL
, 0 },
1288 /* 0xf2 */ { NULL
, NULL
, 0 },
1289 /* 0xf3 */ { NULL
, NULL
, 0 },
1290 /* 0xf4 */ { NULL
, NULL
, 0 },
1291 /* 0xf5 */ { NULL
, NULL
, 0 },
1292 /* 0xf6 */ { NULL
, NULL
, 0 },
1293 /* 0xf7 */ { NULL
, NULL
, 0 },
1294 /* 0xf8 */ { NULL
, NULL
, 0 },
1295 /* 0xf9 */ { NULL
, NULL
, 0 },
1296 /* 0xfa */ { NULL
, NULL
, 0 },
1297 /* 0xfb */ { NULL
, NULL
, 0 },
1298 /* 0xfc */ { NULL
, NULL
, 0 },
1299 /* 0xfd */ { NULL
, NULL
, 0 },
1300 /* 0xfe */ { NULL
, NULL
, 0 },
1301 /* 0xff */ { NULL
, NULL
, 0 }
1305 /*******************************************************************
1306 allocate and initialize a reply packet
1307 ********************************************************************/
1309 void reply_outbuf(struct smb_request
*req
, uint8 num_words
, uint32 num_bytes
)
1312 * Protect against integer wrap
1314 if ((num_bytes
> 0xffffff)
1315 || ((num_bytes
+ smb_size
+ num_words
*2) > 0xffffff)) {
1317 asprintf(&msg
, "num_bytes too large: %u",
1318 (unsigned)num_bytes
);
1322 if (!(req
->outbuf
= TALLOC_ARRAY(
1324 smb_size
+ num_words
*2 + num_bytes
))) {
1325 smb_panic("could not allocate output buffer\n");
1328 construct_reply_common((char *)req
->inbuf
, (char *)req
->outbuf
);
1329 srv_set_message((char *)req
->outbuf
, num_words
, num_bytes
, false);
1331 * Zero out the word area, the caller has to take care of the bcc area
1334 if (num_words
!= 0) {
1335 memset(req
->outbuf
+ smb_vwv0
, 0, num_words
*2);
1342 /*******************************************************************
1343 Dump a packet to a file.
1344 ********************************************************************/
1346 static void smb_dump(const char *name
, int type
, const char *data
, ssize_t len
)
1350 if (DEBUGLEVEL
< 50) {
1354 if (len
< 4) len
= smb_len(data
)+4;
1355 for (i
=1;i
<100;i
++) {
1356 asprintf(&fname
, "/tmp/%s.%d.%s", name
, i
,
1357 type
? "req" : "resp");
1361 fd
= open(fname
, O_WRONLY
|O_CREAT
|O_EXCL
, 0644);
1362 if (fd
!= -1 || errno
!= EEXIST
) break;
1365 ssize_t ret
= write(fd
, data
, len
);
1367 DEBUG(0,("smb_dump: problem: write returned %d\n", (int)ret
));
1369 DEBUG(0,("created %s len %lu\n", fname
, (unsigned long)len
));
1374 /****************************************************************************
1375 Prepare everything for calling the actual request function, and potentially
1376 call the request function via the "new" interface.
1378 Return False if the "legacy" function needs to be called, everything is
1381 Return True if we're done.
1383 I know this API sucks, but it is the one with the least code change I could
1385 ****************************************************************************/
1387 static connection_struct
*switch_message(uint8 type
, struct smb_request
*req
, int size
)
1391 connection_struct
*conn
= NULL
;
1393 static uint16 last_session_tag
= UID_FIELD_INVALID
;
1397 /* Make sure this is an SMB packet. smb_size contains NetBIOS header
1398 * so subtract 4 from it. */
1399 if (!valid_smb_header(req
->inbuf
)
1400 || (size
< (smb_size
- 4))) {
1401 DEBUG(2,("Non-SMB packet of length %d. Terminating server\n",
1402 smb_len(req
->inbuf
)));
1403 exit_server_cleanly("Non-SMB packet");
1406 if (smb_messages
[type
].fn_new
== NULL
) {
1407 DEBUG(0,("Unknown message type %d!\n",type
));
1408 smb_dump("Unknown", 1, (char *)req
->inbuf
, size
);
1409 reply_unknown_new(req
, type
);
1413 flags
= smb_messages
[type
].flags
;
1415 /* In share mode security we must ignore the vuid. */
1416 session_tag
= (lp_security() == SEC_SHARE
)
1417 ? UID_FIELD_INVALID
: req
->vuid
;
1420 DEBUG(3,("switch message %s (pid %d) conn 0x%lx\n", smb_fn_name(type
),
1421 (int)sys_getpid(), (unsigned long)conn
));
1423 smb_dump(smb_fn_name(type
), 1, (char *)req
->inbuf
, size
);
1425 /* Ensure this value is replaced in the incoming packet. */
1426 SSVAL(req
->inbuf
,smb_uid
,session_tag
);
1429 * Ensure the correct username is in current_user_info. This is a
1430 * really ugly bugfix for problems with multiple session_setup_and_X's
1431 * being done and allowing %U and %G substitutions to work correctly.
1432 * There is a reason this code is done here, don't move it unless you
1433 * know what you're doing... :-).
1437 if (session_tag
!= last_session_tag
) {
1438 user_struct
*vuser
= NULL
;
1440 last_session_tag
= session_tag
;
1441 if(session_tag
!= UID_FIELD_INVALID
) {
1442 vuser
= get_valid_user_struct(session_tag
);
1444 set_current_user_info(&vuser
->user
);
1449 /* Does this call need to be run as the connected user? */
1450 if (flags
& AS_USER
) {
1452 /* Does this call need a valid tree connection? */
1455 * Amazingly, the error code depends on the command
1458 if (type
== SMBntcreateX
) {
1459 reply_nterror(req
, NT_STATUS_INVALID_HANDLE
);
1461 reply_doserror(req
, ERRSRV
, ERRinvnid
);
1466 if (!change_to_user(conn
,session_tag
)) {
1467 reply_nterror(req
, NT_STATUS_DOS(ERRSRV
, ERRbaduid
));
1471 /* All NEED_WRITE and CAN_IPC flags must also have AS_USER. */
1473 /* Does it need write permission? */
1474 if ((flags
& NEED_WRITE
) && !CAN_WRITE(conn
)) {
1475 reply_nterror(req
, NT_STATUS_MEDIA_WRITE_PROTECTED
);
1479 /* IPC services are limited */
1480 if (IS_IPC(conn
) && !(flags
& CAN_IPC
)) {
1481 reply_doserror(req
, ERRSRV
,ERRaccess
);
1485 /* This call needs to be run as root */
1486 change_to_root_user();
1489 /* load service specific parameters */
1491 if (req
->encrypted
) {
1492 conn
->encrypted_tid
= true;
1493 /* encrypted required from now on. */
1494 conn
->encrypt_level
= Required
;
1495 } else if (ENCRYPTION_REQUIRED(conn
)) {
1496 uint8 com
= CVAL(req
->inbuf
,smb_com
);
1497 if (com
!= SMBtrans2
&& com
!= SMBtranss2
) {
1498 exit_server_cleanly("encryption required "
1504 if (!set_current_service(conn
,SVAL(req
->inbuf
,smb_flg
),
1505 (flags
& (AS_USER
|DO_CHDIR
)
1507 reply_doserror(req
, ERRSRV
, ERRaccess
);
1510 conn
->num_smb_operations
++;
1513 /* does this protocol need to be run as guest? */
1514 if ((flags
& AS_GUEST
)
1515 && (!change_to_guest() ||
1516 !check_access(smbd_server_fd(), lp_hostsallow(-1),
1517 lp_hostsdeny(-1)))) {
1518 reply_doserror(req
, ERRSRV
, ERRaccess
);
1522 smb_messages
[type
].fn_new(req
);
1526 /****************************************************************************
1527 Construct a reply to the incoming packet.
1528 ****************************************************************************/
1530 static void construct_reply(char *inbuf
, int size
, size_t unread_bytes
, bool encrypted
)
1532 uint8 type
= CVAL(inbuf
,smb_com
);
1533 connection_struct
*conn
;
1534 struct smb_request
*req
;
1540 if (!(req
= talloc(talloc_tos(), struct smb_request
))) {
1541 smb_panic("could not allocate smb_request");
1543 init_smb_request(req
, (uint8
*)inbuf
, unread_bytes
, encrypted
);
1545 conn
= switch_message(type
, req
, size
);
1547 if (req
->unread_bytes
) {
1548 /* writeX failed. drain socket. */
1549 if (drain_socket(smbd_server_fd(), req
->unread_bytes
) !=
1550 req
->unread_bytes
) {
1551 smb_panic("failed to drain pending bytes");
1553 req
->unread_bytes
= 0;
1556 if (req
->outbuf
== NULL
) {
1560 if (CVAL(req
->outbuf
,0) == 0) {
1561 show_msg((char *)req
->outbuf
);
1564 if (!srv_send_smb(smbd_server_fd(),
1565 (char *)req
->outbuf
,
1566 IS_CONN_ENCRYPTED(conn
)||req
->encrypted
)) {
1567 exit_server_cleanly("construct_reply: srv_send_smb failed.");
1575 /****************************************************************************
1576 Process an smb from the client
1577 ****************************************************************************/
1579 static void process_smb(char *inbuf
, size_t nread
, size_t unread_bytes
, bool encrypted
)
1581 static int trans_num
;
1582 int msg_type
= CVAL(inbuf
,0);
1584 DO_PROFILE_INC(smb_count
);
1586 if (trans_num
== 0) {
1587 char addr
[INET6_ADDRSTRLEN
];
1589 /* on the first packet, check the global hosts allow/ hosts
1590 deny parameters before doing any parsing of the packet
1591 passed to us by the client. This prevents attacks on our
1592 parsing code from hosts not in the hosts allow list */
1594 if (!check_access(smbd_server_fd(), lp_hostsallow(-1),
1595 lp_hostsdeny(-1))) {
1596 /* send a negative session response "not listening on calling name" */
1597 static unsigned char buf
[5] = {0x83, 0, 0, 1, 0x81};
1598 DEBUG( 1, ( "Connection denied from %s\n",
1599 client_addr(get_client_fd(),addr
,sizeof(addr
)) ) );
1600 (void)srv_send_smb(smbd_server_fd(),(char *)buf
,false);
1601 exit_server_cleanly("connection denied");
1605 DEBUG( 6, ( "got message type 0x%x of len 0x%x\n", msg_type
,
1607 DEBUG( 3, ( "Transaction %d of length %d (%u toread)\n", trans_num
,
1609 (unsigned int)unread_bytes
));
1611 if (msg_type
!= 0) {
1613 * NetBIOS session request, keepalive, etc.
1615 reply_special(inbuf
);
1621 construct_reply(inbuf
,nread
,unread_bytes
,encrypted
);
1626 /****************************************************************************
1627 Return a string containing the function name of a SMB command.
1628 ****************************************************************************/
1630 const char *smb_fn_name(int type
)
1632 const char *unknown_name
= "SMBunknown";
1634 if (smb_messages
[type
].name
== NULL
)
1635 return(unknown_name
);
1637 return(smb_messages
[type
].name
);
1640 /****************************************************************************
1641 Helper functions for contruct_reply.
1642 ****************************************************************************/
1644 static uint32 common_flags2
= FLAGS2_LONG_PATH_COMPONENTS
|FLAGS2_32_BIT_ERROR_CODES
;
1646 void add_to_common_flags2(uint32 v
)
1651 void remove_from_common_flags2(uint32 v
)
1653 common_flags2
&= ~v
;
1656 void construct_reply_common(const char *inbuf
, char *outbuf
)
1658 srv_set_message(outbuf
,0,0,false);
1660 SCVAL(outbuf
,smb_com
,CVAL(inbuf
,smb_com
));
1661 SIVAL(outbuf
,smb_rcls
,0);
1662 SCVAL(outbuf
,smb_flg
, FLAG_REPLY
| (CVAL(inbuf
,smb_flg
) & FLAG_CASELESS_PATHNAMES
));
1663 SSVAL(outbuf
,smb_flg2
,
1664 (SVAL(inbuf
,smb_flg2
) & FLAGS2_UNICODE_STRINGS
) |
1666 memset(outbuf
+smb_pidhigh
,'\0',(smb_tid
-smb_pidhigh
));
1668 SSVAL(outbuf
,smb_tid
,SVAL(inbuf
,smb_tid
));
1669 SSVAL(outbuf
,smb_pid
,SVAL(inbuf
,smb_pid
));
1670 SSVAL(outbuf
,smb_uid
,SVAL(inbuf
,smb_uid
));
1671 SSVAL(outbuf
,smb_mid
,SVAL(inbuf
,smb_mid
));
1674 /****************************************************************************
1675 Construct a chained reply and add it to the already made reply
1676 ****************************************************************************/
1678 void chain_reply(struct smb_request
*req
)
1680 static char *orig_inbuf
;
1683 * Dirty little const_discard: We mess with req->inbuf, which is
1684 * declared as const. If maybe at some point this routine gets
1685 * rewritten, this const_discard could go away.
1687 char *inbuf
= CONST_DISCARD(char *, req
->inbuf
);
1688 int size
= smb_len(req
->inbuf
)+4;
1690 int smb_com1
, smb_com2
= CVAL(inbuf
,smb_vwv0
);
1691 unsigned smb_off2
= SVAL(inbuf
,smb_vwv1
);
1695 char inbuf_saved
[smb_wct
];
1696 char *outbuf
= (char *)req
->outbuf
;
1697 size_t outsize
= smb_len(outbuf
) + 4;
1698 size_t outsize_padded
;
1699 size_t ofs
, to_move
;
1701 struct smb_request
*req2
;
1702 size_t caller_outputlen
;
1703 char *caller_output
;
1705 /* Maybe its not chained, or it's an error packet. */
1706 if (smb_com2
== 0xFF || SVAL(outbuf
,smb_rcls
) != 0) {
1707 SCVAL(outbuf
,smb_vwv0
,0xFF);
1711 if (chain_size
== 0) {
1712 /* this is the first part of the chain */
1717 * We need to save the output the caller added to the chain so that we
1718 * can splice it into the final output buffer later.
1721 caller_outputlen
= outsize
- smb_wct
;
1723 caller_output
= (char *)memdup(outbuf
+ smb_wct
, caller_outputlen
);
1725 if (caller_output
== NULL
) {
1726 /* TODO: NT_STATUS_NO_MEMORY */
1727 smb_panic("could not dup outbuf");
1731 * The original Win95 redirector dies on a reply to
1732 * a lockingX and read chain unless the chain reply is
1733 * 4 byte aligned. JRA.
1736 outsize_padded
= (outsize
+ 3) & ~3;
1739 * remember how much the caller added to the chain, only counting
1740 * stuff after the parameter words
1742 chain_size
+= outsize_padded
- smb_wct
;
1745 * work out pointers into the original packets. The
1746 * headers on these need to be filled in
1748 inbuf2
= orig_inbuf
+ smb_off2
+ 4 - smb_wct
;
1750 /* remember the original command type */
1751 smb_com1
= CVAL(orig_inbuf
,smb_com
);
1753 /* save the data which will be overwritten by the new headers */
1754 memcpy(inbuf_saved
,inbuf2
,smb_wct
);
1756 /* give the new packet the same header as the last part of the SMB */
1757 memmove(inbuf2
,inbuf
,smb_wct
);
1759 /* create the in buffer */
1760 SCVAL(inbuf2
,smb_com
,smb_com2
);
1762 /* work out the new size for the in buffer. */
1763 new_size
= size
- (inbuf2
- inbuf
);
1765 DEBUG(0,("chain_reply: chain packet size incorrect "
1766 "(orig size = %d, offset = %d)\n",
1767 size
, (int)(inbuf2
- inbuf
) ));
1768 exit_server_cleanly("Bad chained packet");
1772 /* And set it in the header. */
1773 smb_setlen(inbuf2
, new_size
- 4);
1775 DEBUG(3,("Chained message\n"));
1778 if (!(req2
= talloc(talloc_tos(), struct smb_request
))) {
1779 smb_panic("could not allocate smb_request");
1781 init_smb_request(req2
, (uint8
*)inbuf2
,0, req
->encrypted
);
1783 /* process the request */
1784 switch_message(smb_com2
, req2
, new_size
);
1787 * We don't accept deferred operations in chained requests.
1789 SMB_ASSERT(req2
->outbuf
!= NULL
);
1790 outsize2
= smb_len(req2
->outbuf
)+4;
1793 * Move away the new command output so that caller_output fits in,
1794 * copy in the caller_output saved above.
1797 SMB_ASSERT(outsize_padded
>= smb_wct
);
1800 * "ofs" is the space we need for caller_output. Equal to
1801 * caller_outputlen plus the padding.
1804 ofs
= outsize_padded
- smb_wct
;
1807 * "to_move" is the amount of bytes the secondary routine gave us
1810 to_move
= outsize2
- smb_wct
;
1812 if (to_move
+ ofs
+ smb_wct
+ chain_size
> max_send
) {
1813 smb_panic("replies too large -- would have to cut");
1817 * In the "new" API "outbuf" is allocated via reply_outbuf, just for
1818 * the first request in the chain. So we have to re-allocate it. In
1819 * the "old" API the only outbuf ever used is the global OutBuffer
1820 * which is always large enough.
1823 outbuf
= TALLOC_REALLOC_ARRAY(NULL
, outbuf
, char,
1824 to_move
+ ofs
+ smb_wct
);
1825 if (outbuf
== NULL
) {
1826 smb_panic("could not realloc outbuf");
1829 req
->outbuf
= (uint8
*)outbuf
;
1831 memmove(outbuf
+ smb_wct
+ ofs
, req2
->outbuf
+ smb_wct
, to_move
);
1832 memcpy(outbuf
+ smb_wct
, caller_output
, caller_outputlen
);
1835 * copy the new reply header over the old one but preserve the smb_com
1838 memmove(outbuf
, req2
->outbuf
, smb_wct
);
1839 SCVAL(outbuf
, smb_com
, smb_com1
);
1842 * We've just copied in the whole "wct" area from the secondary
1843 * function. Fix up the chaining: com2 and the offset need to be
1847 SCVAL(outbuf
, smb_vwv0
, smb_com2
);
1848 SSVAL(outbuf
, smb_vwv1
, chain_size
+ smb_wct
- 4);
1850 if (outsize_padded
> outsize
) {
1853 * Due to padding we have some uninitialized bytes after the
1857 memset(outbuf
+ outsize
, 0, outsize_padded
- outsize
);
1860 smb_setlen(outbuf
, outsize2
+ chain_size
- 4);
1863 * restore the saved data, being careful not to overwrite any data
1864 * from the reply header
1866 memcpy(inbuf2
,inbuf_saved
,smb_wct
);
1868 SAFE_FREE(caller_output
);
1874 /****************************************************************************
1875 Setup the needed select timeout in milliseconds.
1876 ****************************************************************************/
1878 static int setup_select_timeout(void)
1882 select_timeout
= SMBD_SELECT_TIMEOUT
*1000;
1884 if (print_notify_messages_pending()) {
1885 select_timeout
= MIN(select_timeout
, 1000);
1888 return select_timeout
;
1891 /****************************************************************************
1892 Check if services need reloading.
1893 ****************************************************************************/
1895 void check_reload(time_t t
)
1897 static pid_t mypid
= 0;
1898 static time_t last_smb_conf_reload_time
= 0;
1899 static time_t last_printer_reload_time
= 0;
1900 time_t printcap_cache_time
= (time_t)lp_printcap_cache_time();
1902 if(last_smb_conf_reload_time
== 0) {
1903 last_smb_conf_reload_time
= t
;
1904 /* Our printing subsystem might not be ready at smbd start up.
1905 Then no printer is available till the first printers check
1906 is performed. A lower initial interval circumvents this. */
1907 if ( printcap_cache_time
> 60 )
1908 last_printer_reload_time
= t
- printcap_cache_time
+ 60;
1910 last_printer_reload_time
= t
;
1913 if (mypid
!= getpid()) { /* First time or fork happened meanwhile */
1914 /* randomize over 60 second the printcap reload to avoid all
1915 * process hitting cupsd at the same time */
1916 int time_range
= 60;
1918 last_printer_reload_time
+= random() % time_range
;
1922 if (reload_after_sighup
|| (t
>= last_smb_conf_reload_time
+SMBD_RELOAD_CHECK
)) {
1923 reload_services(True
);
1924 reload_after_sighup
= False
;
1925 last_smb_conf_reload_time
= t
;
1928 /* 'printcap cache time = 0' disable the feature */
1930 if ( printcap_cache_time
!= 0 )
1932 /* see if it's time to reload or if the clock has been set back */
1934 if ( (t
>= last_printer_reload_time
+printcap_cache_time
)
1935 || (t
-last_printer_reload_time
< 0) )
1937 DEBUG( 3,( "Printcap cache time expired.\n"));
1939 last_printer_reload_time
= t
;
1944 /****************************************************************************
1945 Process any timeout housekeeping. Return False if the caller should exit.
1946 ****************************************************************************/
1948 static bool timeout_processing(int *select_timeout
,
1949 time_t *last_timeout_processing_time
)
1953 if (*get_srv_read_error() == SMB_READ_EOF
) {
1954 DEBUG(3,("timeout_processing: End of file from client (client has disconnected).\n"));
1958 if (*get_srv_read_error() == SMB_READ_ERROR
) {
1959 DEBUG(3,("timeout_processing: receive_smb error (%s) Exiting\n",
1964 if (*get_srv_read_error() == SMB_READ_BAD_SIG
) {
1965 DEBUG(3,("timeout_processing: receive_smb error bad smb signature. Exiting\n"));
1969 *last_timeout_processing_time
= t
= time(NULL
);
1971 /* become root again if waiting */
1972 change_to_root_user();
1974 /* check if we need to reload services */
1977 if(global_machine_password_needs_changing
&&
1978 /* for ADS we need to do a regular ADS password change, not a domain
1980 lp_security() == SEC_DOMAIN
) {
1982 unsigned char trust_passwd_hash
[16];
1986 * We're in domain level security, and the code that
1987 * read the machine password flagged that the machine
1988 * password needs changing.
1992 * First, open the machine password file with an exclusive lock.
1995 if (secrets_lock_trust_account_password(lp_workgroup(), True
) == False
) {
1996 DEBUG(0,("process: unable to lock the machine account password for \
1997 machine %s in domain %s.\n", global_myname(), lp_workgroup() ));
2001 if(!secrets_fetch_trust_account_password(lp_workgroup(), trust_passwd_hash
, &lct
, NULL
)) {
2002 DEBUG(0,("process: unable to read the machine account password for \
2003 machine %s in domain %s.\n", global_myname(), lp_workgroup()));
2004 secrets_lock_trust_account_password(lp_workgroup(), False
);
2009 * Make sure someone else hasn't already done this.
2012 if(t
< lct
+ lp_machine_password_timeout()) {
2013 global_machine_password_needs_changing
= False
;
2014 secrets_lock_trust_account_password(lp_workgroup(), False
);
2018 /* always just contact the PDC here */
2020 change_trust_account_password( lp_workgroup(), NULL
);
2021 global_machine_password_needs_changing
= False
;
2022 secrets_lock_trust_account_password(lp_workgroup(), False
);
2025 /* update printer queue caches if necessary */
2027 update_monitored_printq_cache();
2030 * Now we are root, check if the log files need pruning.
2031 * Force a log file check.
2033 force_check_log_size();
2036 /* Send any queued printer notify message to interested smbd's. */
2038 print_notify_send_messages(smbd_messaging_context(), 0);
2041 * Modify the select timeout depending upon
2042 * what we have remaining in our queues.
2045 *select_timeout
= setup_select_timeout();
2050 /****************************************************************************
2051 Process commands from the client
2052 ****************************************************************************/
2054 void smbd_process(void)
2056 time_t last_timeout_processing_time
= time(NULL
);
2057 unsigned int num_smbs
= 0;
2058 size_t unread_bytes
= 0;
2060 max_recv
= MIN(lp_maxxmit(),BUFFER_SIZE
);
2063 int select_timeout
= setup_select_timeout();
2067 bool encrypted
= false;
2068 TALLOC_CTX
*frame
= talloc_stackframe_pool(8192);
2072 /* Did someone ask for immediate checks on things like blocking locks ? */
2073 if (select_timeout
== 0) {
2074 if(!timeout_processing(&select_timeout
,
2075 &last_timeout_processing_time
))
2077 num_smbs
= 0; /* Reset smb counter. */
2080 run_events(smbd_event_context(), 0, NULL
, NULL
);
2082 while (!receive_message_or_smb(talloc_tos(), &inbuf
, &inbuf_len
,
2086 if(!timeout_processing(&select_timeout
,
2087 &last_timeout_processing_time
))
2089 num_smbs
= 0; /* Reset smb counter. */
2094 * Ensure we do timeout processing if the SMB we just got was
2095 * only an echo request. This allows us to set the select
2096 * timeout in 'receive_message_or_smb()' to any value we like
2097 * without worrying that the client will send echo requests
2098 * faster than the select timeout, thus starving out the
2099 * essential processing (change notify, blocking locks) that
2100 * the timeout code does. JRA.
2102 num_echos
= smb_echo_count
;
2104 process_smb(inbuf
, inbuf_len
, unread_bytes
, encrypted
);
2108 if (smb_echo_count
!= num_echos
) {
2109 if(!timeout_processing( &select_timeout
, &last_timeout_processing_time
))
2111 num_smbs
= 0; /* Reset smb counter. */
2117 * If we are getting smb requests in a constant stream
2118 * with no echos, make sure we attempt timeout processing
2119 * every select_timeout milliseconds - but only check for this
2120 * every 200 smb requests.
2123 if ((num_smbs
% 200) == 0) {
2124 time_t new_check_time
= time(NULL
);
2125 if(new_check_time
- last_timeout_processing_time
>= (select_timeout
/1000)) {
2126 if(!timeout_processing(
2128 &last_timeout_processing_time
))
2130 num_smbs
= 0; /* Reset smb counter. */
2131 last_timeout_processing_time
= new_check_time
; /* Reset time. */
2135 /* The timeout_processing function isn't run nearly
2136 often enough to implement 'max log size' without
2137 overrunning the size of the file by many megabytes.
2138 This is especially true if we are running at debug
2139 level 10. Checking every 50 SMBs is a nice
2140 tradeoff of performance vs log file size overrun. */
2142 if ((num_smbs
% 50) == 0 && need_to_check_log_size()) {
2143 change_to_root_user();