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)) {
133 * Correct fix. smb_read_error may have already been
134 * set. Only set it here if not already set. Global
135 * variables still suck :-). JRA.
138 cond_set_smb_read_error(get_srv_read_error(),
146 static ssize_t
read_packet_remainder(int fd
,
148 unsigned int timeout
,
157 ret
= read_socket_with_timeout(fd
, buffer
, len
, len
, timeout
,
158 get_srv_read_error());
161 cond_set_smb_read_error(get_srv_read_error(),
169 /****************************************************************************
170 Attempt a zerocopy writeX read. We know here that len > smb_size-4
171 ****************************************************************************/
174 * Unfortunately, earlier versions of smbclient/libsmbclient
175 * don't send this "standard" writeX header. I've fixed this
176 * for 3.2 but we'll use the old method with earlier versions.
177 * Windows and CIFSFS at least use this standard size. Not
181 #define STANDARD_WRITE_AND_X_HEADER_SIZE (smb_size - 4 + /* basic header */ \
182 (2*14) + /* word count (including bcc) */ \
185 static ssize_t
receive_smb_raw_talloc_partial_read(TALLOC_CTX
*mem_ctx
,
186 const char lenbuf
[4],
189 unsigned int timeout
,
192 /* Size of a WRITEX call (+4 byte len). */
193 char writeX_header
[4 + STANDARD_WRITE_AND_X_HEADER_SIZE
];
194 ssize_t len
= smb_len_large(lenbuf
); /* Could be a UNIX large writeX. */
198 memcpy(writeX_header
, lenbuf
, sizeof(lenbuf
));
200 ret
= read_socket_with_timeout(fd
, writeX_header
+ 4,
201 STANDARD_WRITE_AND_X_HEADER_SIZE
,
202 STANDARD_WRITE_AND_X_HEADER_SIZE
,
203 timeout
, get_srv_read_error());
205 if (ret
!= STANDARD_WRITE_AND_X_HEADER_SIZE
) {
206 cond_set_smb_read_error(get_srv_read_error(),
212 * Ok - now try and see if this is a possible
216 if (is_valid_writeX_buffer((uint8_t *)writeX_header
)) {
218 * If the data offset is beyond what
219 * we've read, drain the extra bytes.
221 uint16_t doff
= SVAL(writeX_header
,smb_vwv11
);
224 if (doff
> STANDARD_WRITE_AND_X_HEADER_SIZE
) {
225 size_t drain
= doff
- STANDARD_WRITE_AND_X_HEADER_SIZE
;
226 if (drain_socket(smbd_server_fd(), drain
) != drain
) {
227 smb_panic("receive_smb_raw_talloc_partial_read:"
228 " failed to drain pending bytes");
231 doff
= STANDARD_WRITE_AND_X_HEADER_SIZE
;
234 /* Spoof down the length and null out the bcc. */
235 set_message_bcc(writeX_header
, 0);
236 newlen
= smb_len(writeX_header
);
238 /* Copy the header we've written. */
240 *buffer
= (char *)TALLOC_MEMDUP(mem_ctx
,
242 sizeof(writeX_header
));
244 if (*buffer
== NULL
) {
245 DEBUG(0, ("Could not allocate inbuf of length %d\n",
246 (int)sizeof(writeX_header
)));
247 cond_set_smb_read_error(get_srv_read_error(),
252 /* Work out the remaining bytes. */
253 *p_unread
= len
- STANDARD_WRITE_AND_X_HEADER_SIZE
;
258 if (!valid_packet_size(len
)) {
263 * Not a valid writeX call. Just do the standard
267 *buffer
= TALLOC_ARRAY(mem_ctx
, char, len
+4);
269 if (*buffer
== NULL
) {
270 DEBUG(0, ("Could not allocate inbuf of length %d\n",
272 cond_set_smb_read_error(get_srv_read_error(),
277 /* Copy in what we already read. */
280 4 + STANDARD_WRITE_AND_X_HEADER_SIZE
);
281 toread
= len
- STANDARD_WRITE_AND_X_HEADER_SIZE
;
284 ret
= read_packet_remainder(fd
,
285 (*buffer
) + 4 + STANDARD_WRITE_AND_X_HEADER_SIZE
,
296 static ssize_t
receive_smb_raw_talloc(TALLOC_CTX
*mem_ctx
,
299 unsigned int timeout
,
304 int min_recv_size
= lp_min_receive_file_size();
306 set_smb_read_error(get_srv_read_error(),SMB_READ_OK
);
309 len
= read_smb_length_return_keepalive(fd
, lenbuf
,
310 timeout
, get_srv_read_error());
312 DEBUG(10,("receive_smb_raw: length < 0!\n"));
315 * Correct fix. smb_read_error may have already been
316 * set. Only set it here if not already set. Global
317 * variables still suck :-). JRA.
320 cond_set_smb_read_error(get_srv_read_error(),SMB_READ_ERROR
);
324 if (CVAL(lenbuf
,0) == 0 &&
326 smb_len_large(lenbuf
) > min_recv_size
&& /* Could be a UNIX large writeX. */
327 !srv_is_signing_active()) {
329 return receive_smb_raw_talloc_partial_read(mem_ctx
,
337 if (!valid_packet_size(len
)) {
342 * The +4 here can't wrap, we've checked the length above already.
345 *buffer
= TALLOC_ARRAY(mem_ctx
, char, len
+4);
347 if (*buffer
== NULL
) {
348 DEBUG(0, ("Could not allocate inbuf of length %d\n",
350 cond_set_smb_read_error(get_srv_read_error(),SMB_READ_ERROR
);
354 memcpy(*buffer
, lenbuf
, sizeof(lenbuf
));
356 ret
= read_packet_remainder(fd
, (*buffer
)+4, timeout
, len
);
364 static ssize_t
receive_smb_talloc(TALLOC_CTX
*mem_ctx
,
367 unsigned int timeout
,
373 *p_encrypted
= false;
375 len
= receive_smb_raw_talloc(mem_ctx
, fd
, buffer
, timeout
, p_unread
);
381 if (is_encrypted_packet((uint8_t *)*buffer
)) {
382 NTSTATUS status
= srv_decrypt_buffer(*buffer
);
383 if (!NT_STATUS_IS_OK(status
)) {
384 DEBUG(0, ("receive_smb_talloc: SMB decryption failed on "
385 "incoming packet! Error %s\n",
386 nt_errstr(status
) ));
387 cond_set_smb_read_error(get_srv_read_error(),
388 SMB_READ_BAD_DECRYPT
);
394 /* Check the incoming SMB signature. */
395 if (!srv_check_sign_mac(*buffer
, true)) {
396 DEBUG(0, ("receive_smb: SMB Signature verification failed on "
397 "incoming packet!\n"));
398 cond_set_smb_read_error(get_srv_read_error(),SMB_READ_BAD_SIG
);
406 * Initialize a struct smb_request from an inbuf
409 void init_smb_request(struct smb_request
*req
,
414 size_t req_size
= smb_len(inbuf
) + 4;
415 /* Ensure we have at least smb_size bytes. */
416 if (req_size
< smb_size
) {
417 DEBUG(0,("init_smb_request: invalid request size %u\n",
418 (unsigned int)req_size
));
419 exit_server_cleanly("Invalid SMB request");
421 req
->flags2
= SVAL(inbuf
, smb_flg2
);
422 req
->smbpid
= SVAL(inbuf
, smb_pid
);
423 req
->mid
= SVAL(inbuf
, smb_mid
);
424 req
->vuid
= SVAL(inbuf
, smb_uid
);
425 req
->tid
= SVAL(inbuf
, smb_tid
);
426 req
->wct
= CVAL(inbuf
, smb_wct
);
427 req
->unread_bytes
= unread_bytes
;
428 req
->encrypted
= encrypted
;
429 req
->conn
= conn_find(req
->tid
);
431 /* Ensure we have at least wct words and 2 bytes of bcc. */
432 if (smb_size
+ req
->wct
*2 > req_size
) {
433 DEBUG(0,("init_smb_request: invalid wct number %u (size %u)\n",
434 (unsigned int)req
->wct
,
435 (unsigned int)req_size
));
436 exit_server_cleanly("Invalid SMB request");
438 /* Ensure bcc is correct. */
439 if (((uint8
*)smb_buf(inbuf
)) + smb_buflen(inbuf
) > inbuf
+ req_size
) {
440 DEBUG(0,("init_smb_request: invalid bcc number %u "
441 "(wct = %u, size %u)\n",
442 (unsigned int)smb_buflen(inbuf
),
443 (unsigned int)req
->wct
,
444 (unsigned int)req_size
));
445 exit_server_cleanly("Invalid SMB request");
451 /****************************************************************************
452 structure to hold a linked list of queued messages.
454 ****************************************************************************/
456 static struct pending_message_list
*deferred_open_queue
;
458 /****************************************************************************
459 Function to push a message onto the tail of a linked list of smb messages ready
461 ****************************************************************************/
463 static bool push_queued_message(struct smb_request
*req
,
464 struct timeval request_time
,
465 struct timeval end_time
,
466 char *private_data
, size_t private_len
)
468 int msg_len
= smb_len(req
->inbuf
) + 4;
469 struct pending_message_list
*msg
;
471 msg
= TALLOC_ZERO_P(NULL
, struct pending_message_list
);
474 DEBUG(0,("push_message: malloc fail (1)\n"));
478 msg
->buf
= data_blob_talloc(msg
, req
->inbuf
, msg_len
);
479 if(msg
->buf
.data
== NULL
) {
480 DEBUG(0,("push_message: malloc fail (2)\n"));
485 msg
->request_time
= request_time
;
486 msg
->end_time
= end_time
;
487 msg
->encrypted
= req
->encrypted
;
490 msg
->private_data
= data_blob_talloc(msg
, private_data
,
492 if (msg
->private_data
.data
== NULL
) {
493 DEBUG(0,("push_message: malloc fail (3)\n"));
499 DLIST_ADD_END(deferred_open_queue
, msg
, struct pending_message_list
*);
501 DEBUG(10,("push_message: pushed message length %u on "
502 "deferred_open_queue\n", (unsigned int)msg_len
));
507 /****************************************************************************
508 Function to delete a sharing violation open message by mid.
509 ****************************************************************************/
511 void remove_deferred_open_smb_message(uint16 mid
)
513 struct pending_message_list
*pml
;
515 for (pml
= deferred_open_queue
; pml
; pml
= pml
->next
) {
516 if (mid
== SVAL(pml
->buf
.data
,smb_mid
)) {
517 DEBUG(10,("remove_sharing_violation_open_smb_message: "
518 "deleting mid %u len %u\n",
520 (unsigned int)pml
->buf
.length
));
521 DLIST_REMOVE(deferred_open_queue
, pml
);
528 /****************************************************************************
529 Move a sharing violation open retry message to the front of the list and
530 schedule it for immediate processing.
531 ****************************************************************************/
533 void schedule_deferred_open_smb_message(uint16 mid
)
535 struct pending_message_list
*pml
;
538 for (pml
= deferred_open_queue
; pml
; pml
= pml
->next
) {
539 uint16 msg_mid
= SVAL(pml
->buf
.data
,smb_mid
);
540 DEBUG(10,("schedule_deferred_open_smb_message: [%d] msg_mid = %u\n", i
++,
541 (unsigned int)msg_mid
));
542 if (mid
== msg_mid
) {
543 DEBUG(10,("schedule_deferred_open_smb_message: scheduling mid %u\n",
545 pml
->end_time
.tv_sec
= 0;
546 pml
->end_time
.tv_usec
= 0;
547 DLIST_PROMOTE(deferred_open_queue
, pml
);
552 DEBUG(10,("schedule_deferred_open_smb_message: failed to find message mid %u\n",
556 /****************************************************************************
557 Return true if this mid is on the deferred queue.
558 ****************************************************************************/
560 bool open_was_deferred(uint16 mid
)
562 struct pending_message_list
*pml
;
564 for (pml
= deferred_open_queue
; pml
; pml
= pml
->next
) {
565 if (SVAL(pml
->buf
.data
,smb_mid
) == mid
) {
572 /****************************************************************************
573 Return the message queued by this mid.
574 ****************************************************************************/
576 struct pending_message_list
*get_open_deferred_message(uint16 mid
)
578 struct pending_message_list
*pml
;
580 for (pml
= deferred_open_queue
; pml
; pml
= pml
->next
) {
581 if (SVAL(pml
->buf
.data
,smb_mid
) == mid
) {
588 /****************************************************************************
589 Function to push a deferred open smb message onto a linked list of local smb
590 messages ready for processing.
591 ****************************************************************************/
593 bool push_deferred_smb_message(struct smb_request
*req
,
594 struct timeval request_time
,
595 struct timeval timeout
,
596 char *private_data
, size_t priv_len
)
598 struct timeval end_time
;
600 if (req
->unread_bytes
) {
601 DEBUG(0,("push_deferred_smb_message: logic error ! "
602 "unread_bytes = %u\n",
603 (unsigned int)req
->unread_bytes
));
604 smb_panic("push_deferred_smb_message: "
605 "logic error unread_bytes != 0" );
608 end_time
= timeval_sum(&request_time
, &timeout
);
610 DEBUG(10,("push_deferred_open_smb_message: pushing message len %u mid %u "
611 "timeout time [%u.%06u]\n",
612 (unsigned int) smb_len(req
->inbuf
)+4, (unsigned int)req
->mid
,
613 (unsigned int)end_time
.tv_sec
,
614 (unsigned int)end_time
.tv_usec
));
616 return push_queued_message(req
, request_time
, end_time
,
617 private_data
, priv_len
);
621 struct timed_event
*te
;
622 struct timeval interval
;
624 bool (*handler
)(const struct timeval
*now
, void *private_data
);
628 static void idle_event_handler(struct event_context
*ctx
,
629 struct timed_event
*te
,
630 const struct timeval
*now
,
633 struct idle_event
*event
=
634 talloc_get_type_abort(private_data
, struct idle_event
);
636 TALLOC_FREE(event
->te
);
638 if (!event
->handler(now
, event
->private_data
)) {
639 /* Don't repeat, delete ourselves */
644 event
->te
= event_add_timed(ctx
, event
,
645 timeval_sum(now
, &event
->interval
),
647 idle_event_handler
, event
);
649 /* We can't do much but fail here. */
650 SMB_ASSERT(event
->te
!= NULL
);
653 struct idle_event
*event_add_idle(struct event_context
*event_ctx
,
655 struct timeval interval
,
657 bool (*handler
)(const struct timeval
*now
,
661 struct idle_event
*result
;
662 struct timeval now
= timeval_current();
664 result
= TALLOC_P(mem_ctx
, struct idle_event
);
665 if (result
== NULL
) {
666 DEBUG(0, ("talloc failed\n"));
670 result
->interval
= interval
;
671 result
->handler
= handler
;
672 result
->private_data
= private_data
;
674 if (!(result
->name
= talloc_asprintf(result
, "idle_evt(%s)", name
))) {
675 DEBUG(0, ("talloc failed\n"));
680 result
->te
= event_add_timed(event_ctx
, result
,
681 timeval_sum(&now
, &interval
),
683 idle_event_handler
, result
);
684 if (result
->te
== NULL
) {
685 DEBUG(0, ("event_add_timed failed\n"));
693 /****************************************************************************
694 Do all async processing in here. This includes kernel oplock messages, change
696 ****************************************************************************/
698 static void async_processing(fd_set
*pfds
)
700 DEBUG(10,("async_processing: Doing async processing.\n"));
704 process_kernel_oplocks(smbd_messaging_context(), pfds
);
706 /* Do the aio check again after receive_local_message as it does a
707 select and may have eaten our signal. */
708 /* Is this till true? -- vl */
712 exit_server_cleanly("termination signal");
715 /* check for sighup processing */
716 if (reload_after_sighup
) {
717 change_to_root_user();
718 DEBUG(1,("Reloading services after SIGHUP\n"));
719 reload_services(False
);
720 reload_after_sighup
= 0;
724 /****************************************************************************
725 Add a fd to the set we will be select(2)ing on.
726 ****************************************************************************/
728 static int select_on_fd(int fd
, int maxfd
, fd_set
*fds
)
732 maxfd
= MAX(maxfd
, fd
);
738 /****************************************************************************
739 Do a select on an two fd's - with timeout.
741 If a local udp message has been pushed onto the
742 queue (this can only happen during oplock break
743 processing) call async_processing()
745 If a pending smb message has been pushed onto the
746 queue (this can only happen during oplock break
747 processing) return this next.
749 If the first smbfd is ready then read an smb from it.
750 if the second (loopback UDP) fd is ready then read a message
751 from it and setup the buffer header to identify the length
753 Returns False on timeout or error.
756 The timeout is in milliseconds
757 ****************************************************************************/
759 static bool receive_message_or_smb(TALLOC_CTX
*mem_ctx
,
773 set_smb_read_error(get_srv_read_error(),SMB_READ_OK
);
778 to
.tv_sec
= timeout
/ 1000;
779 to
.tv_usec
= (timeout
% 1000) * 1000;
781 to
.tv_sec
= SMBD_SELECT_TIMEOUT
;
786 * Note that this call must be before processing any SMB
787 * messages as we need to synchronously process any messages
788 * we may have sent to ourselves from the previous SMB.
790 message_dispatch(smbd_messaging_context());
793 * Check to see if we already have a message on the deferred open queue
794 * and it's time to schedule.
796 if(deferred_open_queue
!= NULL
) {
797 bool pop_message
= False
;
798 struct pending_message_list
*msg
= deferred_open_queue
;
800 if (timeval_is_zero(&msg
->end_time
)) {
807 tdif
= usec_time_diff(&msg
->end_time
, &tv
);
809 /* Timed out. Schedule...*/
811 DEBUG(10,("receive_message_or_smb: queued message timed out.\n"));
813 /* Make a more accurate select timeout. */
814 to
.tv_sec
= tdif
/ 1000000;
815 to
.tv_usec
= tdif
% 1000000;
816 DEBUG(10,("receive_message_or_smb: select with timeout of [%u.%06u]\n",
817 (unsigned int)to
.tv_sec
, (unsigned int)to
.tv_usec
));
823 *buffer
= (char *)talloc_memdup(mem_ctx
, msg
->buf
.data
,
825 if (*buffer
== NULL
) {
826 DEBUG(0, ("talloc failed\n"));
827 set_smb_read_error(get_srv_read_error(),SMB_READ_ERROR
);
830 *buffer_len
= msg
->buf
.length
;
831 *p_encrypted
= msg
->encrypted
;
833 /* We leave this message on the queue so the open code can
834 know this is a retry. */
835 DEBUG(5,("receive_message_or_smb: returning deferred open smb message.\n"));
841 * Setup the select fd sets.
848 * Ensure we process oplock break messages by preference.
849 * We have to do this before the select, after the select
850 * and if the select returns EINTR. This is due to the fact
851 * that the selects called from async_processing can eat an EINTR
852 * caused by a signal (we can't take the break message there).
853 * This is hideously complex - *MUST* be simplified for 3.0 ! JRA.
856 if (oplock_message_waiting(&r_fds
)) {
857 DEBUG(10,("receive_message_or_smb: oplock_message is waiting.\n"));
858 async_processing(&r_fds
);
860 * After async processing we must go and do the select again, as
861 * the state of the flag in fds for the server file descriptor is
862 * indeterminate - we may have done I/O on it in the oplock processing. JRA.
868 * Are there any timed events waiting ? If so, ensure we don't
869 * select for longer than it would take to wait for them.
876 event_add_to_select_args(smbd_event_context(), &now
,
877 &r_fds
, &w_fds
, &to
, &maxfd
);
880 if (timeval_is_zero(&to
)) {
881 /* Process a timed event now... */
882 if (run_events(smbd_event_context(), 0, NULL
, NULL
)) {
889 START_PROFILE(smbd_idle
);
891 maxfd
= select_on_fd(smbd_server_fd(), maxfd
, &r_fds
);
892 maxfd
= select_on_fd(oplock_notify_fd(), maxfd
, &r_fds
);
894 selrtn
= sys_select(maxfd
+1,&r_fds
,&w_fds
,NULL
,&to
);
897 END_PROFILE(smbd_idle
);
901 if (run_events(smbd_event_context(), selrtn
, &r_fds
, &w_fds
)) {
905 /* if we get EINTR then maybe we have received an oplock
906 signal - treat this as select returning 1. This is ugly, but
907 is the best we can do until the oplock code knows more about
909 if (selrtn
== -1 && errno
== EINTR
) {
910 async_processing(&r_fds
);
912 * After async processing we must go and do the select again, as
913 * the state of the flag in fds for the server file descriptor is
914 * indeterminate - we may have done I/O on it in the oplock processing. JRA.
921 /* something is wrong. Maybe the socket is dead? */
922 set_smb_read_error(get_srv_read_error(),SMB_READ_ERROR
);
926 /* Did we timeout ? */
928 set_smb_read_error(get_srv_read_error(),SMB_READ_TIMEOUT
);
933 * Ensure we process oplock break messages by preference.
934 * This is IMPORTANT ! Otherwise we can starve other processes
935 * sending us an oplock break message. JRA.
938 if (oplock_message_waiting(&r_fds
)) {
939 async_processing(&r_fds
);
941 * After async processing we must go and do the select again, as
942 * the state of the flag in fds for the server file descriptor is
943 * indeterminate - we may have done I/O on it in the oplock processing. JRA.
948 len
= receive_smb_talloc(mem_ctx
, smbd_server_fd(),
949 buffer
, 0, p_unread
, p_encrypted
);
955 *buffer_len
= (size_t)len
;
961 * Only allow 5 outstanding trans requests. We're allocating memory, so
965 NTSTATUS
allow_new_trans(struct trans_state
*list
, int mid
)
968 for (; list
!= NULL
; list
= list
->next
) {
970 if (list
->mid
== mid
) {
971 return NT_STATUS_INVALID_PARAMETER
;
977 return NT_STATUS_INSUFFICIENT_RESOURCES
;
983 /****************************************************************************
984 We're terminating and have closed all our files/connections etc.
985 If there are any pending local messages we need to respond to them
986 before termination so that other smbds don't think we just died whilst
988 ****************************************************************************/
990 void respond_to_all_remaining_local_messages(void)
993 * Assert we have no exclusive open oplocks.
996 if(get_number_of_exclusive_open_oplocks()) {
997 DEBUG(0,("respond_to_all_remaining_local_messages: PANIC : we have %d exclusive oplocks.\n",
998 get_number_of_exclusive_open_oplocks() ));
1002 process_kernel_oplocks(smbd_messaging_context(), NULL
);
1009 These flags determine some of the permissions required to do an operation
1011 Note that I don't set NEED_WRITE on some write operations because they
1012 are used by some brain-dead clients when printing, and I don't want to
1013 force write permissions on print services.
1015 #define AS_USER (1<<0)
1016 #define NEED_WRITE (1<<1) /* Must be paired with AS_USER */
1017 #define TIME_INIT (1<<2)
1018 #define CAN_IPC (1<<3) /* Must be paired with AS_USER */
1019 #define AS_GUEST (1<<5) /* Must *NOT* be paired with AS_USER */
1020 #define DO_CHDIR (1<<6)
1023 define a list of possible SMB messages and their corresponding
1024 functions. Any message that has a NULL function is unimplemented -
1025 please feel free to contribute implementations!
1027 static const struct smb_message_struct
{
1029 void (*fn_new
)(struct smb_request
*req
);
1031 } smb_messages
[256] = {
1033 /* 0x00 */ { "SMBmkdir",reply_mkdir
,AS_USER
| NEED_WRITE
},
1034 /* 0x01 */ { "SMBrmdir",reply_rmdir
,AS_USER
| NEED_WRITE
},
1035 /* 0x02 */ { "SMBopen",reply_open
,AS_USER
},
1036 /* 0x03 */ { "SMBcreate",reply_mknew
,AS_USER
},
1037 /* 0x04 */ { "SMBclose",reply_close
,AS_USER
| CAN_IPC
},
1038 /* 0x05 */ { "SMBflush",reply_flush
,AS_USER
},
1039 /* 0x06 */ { "SMBunlink",reply_unlink
,AS_USER
| NEED_WRITE
},
1040 /* 0x07 */ { "SMBmv",reply_mv
,AS_USER
| NEED_WRITE
},
1041 /* 0x08 */ { "SMBgetatr",reply_getatr
,AS_USER
},
1042 /* 0x09 */ { "SMBsetatr",reply_setatr
,AS_USER
| NEED_WRITE
},
1043 /* 0x0a */ { "SMBread",reply_read
,AS_USER
},
1044 /* 0x0b */ { "SMBwrite",reply_write
,AS_USER
| CAN_IPC
},
1045 /* 0x0c */ { "SMBlock",reply_lock
,AS_USER
},
1046 /* 0x0d */ { "SMBunlock",reply_unlock
,AS_USER
},
1047 /* 0x0e */ { "SMBctemp",reply_ctemp
,AS_USER
},
1048 /* 0x0f */ { "SMBmknew",reply_mknew
,AS_USER
},
1049 /* 0x10 */ { "SMBcheckpath",reply_checkpath
,AS_USER
},
1050 /* 0x11 */ { "SMBexit",reply_exit
,DO_CHDIR
},
1051 /* 0x12 */ { "SMBlseek",reply_lseek
,AS_USER
},
1052 /* 0x13 */ { "SMBlockread",reply_lockread
,AS_USER
},
1053 /* 0x14 */ { "SMBwriteunlock",reply_writeunlock
,AS_USER
},
1054 /* 0x15 */ { NULL
, NULL
, 0 },
1055 /* 0x16 */ { NULL
, NULL
, 0 },
1056 /* 0x17 */ { NULL
, NULL
, 0 },
1057 /* 0x18 */ { NULL
, NULL
, 0 },
1058 /* 0x19 */ { NULL
, NULL
, 0 },
1059 /* 0x1a */ { "SMBreadbraw",reply_readbraw
,AS_USER
},
1060 /* 0x1b */ { "SMBreadBmpx",reply_readbmpx
,AS_USER
},
1061 /* 0x1c */ { "SMBreadBs",reply_readbs
,AS_USER
},
1062 /* 0x1d */ { "SMBwritebraw",reply_writebraw
,AS_USER
},
1063 /* 0x1e */ { "SMBwriteBmpx",reply_writebmpx
,AS_USER
},
1064 /* 0x1f */ { "SMBwriteBs",reply_writebs
,AS_USER
},
1065 /* 0x20 */ { "SMBwritec", NULL
,0},
1066 /* 0x21 */ { NULL
, NULL
, 0 },
1067 /* 0x22 */ { "SMBsetattrE",reply_setattrE
,AS_USER
| NEED_WRITE
},
1068 /* 0x23 */ { "SMBgetattrE",reply_getattrE
,AS_USER
},
1069 /* 0x24 */ { "SMBlockingX",reply_lockingX
,AS_USER
},
1070 /* 0x25 */ { "SMBtrans",reply_trans
,AS_USER
| CAN_IPC
},
1071 /* 0x26 */ { "SMBtranss",reply_transs
,AS_USER
| CAN_IPC
},
1072 /* 0x27 */ { "SMBioctl",reply_ioctl
,0},
1073 /* 0x28 */ { "SMBioctls", NULL
,AS_USER
},
1074 /* 0x29 */ { "SMBcopy",reply_copy
,AS_USER
| NEED_WRITE
},
1075 /* 0x2a */ { "SMBmove", NULL
,AS_USER
| NEED_WRITE
},
1076 /* 0x2b */ { "SMBecho",reply_echo
,0},
1077 /* 0x2c */ { "SMBwriteclose",reply_writeclose
,AS_USER
},
1078 /* 0x2d */ { "SMBopenX",reply_open_and_X
,AS_USER
| CAN_IPC
},
1079 /* 0x2e */ { "SMBreadX",reply_read_and_X
,AS_USER
| CAN_IPC
},
1080 /* 0x2f */ { "SMBwriteX",reply_write_and_X
,AS_USER
| CAN_IPC
},
1081 /* 0x30 */ { NULL
, NULL
, 0 },
1082 /* 0x31 */ { NULL
, NULL
, 0 },
1083 /* 0x32 */ { "SMBtrans2",reply_trans2
, AS_USER
| CAN_IPC
},
1084 /* 0x33 */ { "SMBtranss2",reply_transs2
, AS_USER
},
1085 /* 0x34 */ { "SMBfindclose",reply_findclose
,AS_USER
},
1086 /* 0x35 */ { "SMBfindnclose",reply_findnclose
,AS_USER
},
1087 /* 0x36 */ { NULL
, NULL
, 0 },
1088 /* 0x37 */ { NULL
, NULL
, 0 },
1089 /* 0x38 */ { NULL
, NULL
, 0 },
1090 /* 0x39 */ { NULL
, NULL
, 0 },
1091 /* 0x3a */ { NULL
, NULL
, 0 },
1092 /* 0x3b */ { NULL
, NULL
, 0 },
1093 /* 0x3c */ { NULL
, NULL
, 0 },
1094 /* 0x3d */ { NULL
, NULL
, 0 },
1095 /* 0x3e */ { NULL
, NULL
, 0 },
1096 /* 0x3f */ { NULL
, NULL
, 0 },
1097 /* 0x40 */ { NULL
, NULL
, 0 },
1098 /* 0x41 */ { NULL
, NULL
, 0 },
1099 /* 0x42 */ { NULL
, NULL
, 0 },
1100 /* 0x43 */ { NULL
, NULL
, 0 },
1101 /* 0x44 */ { NULL
, NULL
, 0 },
1102 /* 0x45 */ { NULL
, NULL
, 0 },
1103 /* 0x46 */ { NULL
, NULL
, 0 },
1104 /* 0x47 */ { NULL
, NULL
, 0 },
1105 /* 0x48 */ { NULL
, NULL
, 0 },
1106 /* 0x49 */ { NULL
, NULL
, 0 },
1107 /* 0x4a */ { NULL
, NULL
, 0 },
1108 /* 0x4b */ { NULL
, NULL
, 0 },
1109 /* 0x4c */ { NULL
, NULL
, 0 },
1110 /* 0x4d */ { NULL
, NULL
, 0 },
1111 /* 0x4e */ { NULL
, NULL
, 0 },
1112 /* 0x4f */ { NULL
, NULL
, 0 },
1113 /* 0x50 */ { NULL
, NULL
, 0 },
1114 /* 0x51 */ { NULL
, NULL
, 0 },
1115 /* 0x52 */ { NULL
, NULL
, 0 },
1116 /* 0x53 */ { NULL
, NULL
, 0 },
1117 /* 0x54 */ { NULL
, NULL
, 0 },
1118 /* 0x55 */ { NULL
, NULL
, 0 },
1119 /* 0x56 */ { NULL
, NULL
, 0 },
1120 /* 0x57 */ { NULL
, NULL
, 0 },
1121 /* 0x58 */ { NULL
, NULL
, 0 },
1122 /* 0x59 */ { NULL
, NULL
, 0 },
1123 /* 0x5a */ { NULL
, NULL
, 0 },
1124 /* 0x5b */ { NULL
, NULL
, 0 },
1125 /* 0x5c */ { NULL
, NULL
, 0 },
1126 /* 0x5d */ { NULL
, NULL
, 0 },
1127 /* 0x5e */ { NULL
, NULL
, 0 },
1128 /* 0x5f */ { NULL
, NULL
, 0 },
1129 /* 0x60 */ { NULL
, NULL
, 0 },
1130 /* 0x61 */ { NULL
, NULL
, 0 },
1131 /* 0x62 */ { NULL
, NULL
, 0 },
1132 /* 0x63 */ { NULL
, NULL
, 0 },
1133 /* 0x64 */ { NULL
, NULL
, 0 },
1134 /* 0x65 */ { NULL
, NULL
, 0 },
1135 /* 0x66 */ { NULL
, NULL
, 0 },
1136 /* 0x67 */ { NULL
, NULL
, 0 },
1137 /* 0x68 */ { NULL
, NULL
, 0 },
1138 /* 0x69 */ { NULL
, NULL
, 0 },
1139 /* 0x6a */ { NULL
, NULL
, 0 },
1140 /* 0x6b */ { NULL
, NULL
, 0 },
1141 /* 0x6c */ { NULL
, NULL
, 0 },
1142 /* 0x6d */ { NULL
, NULL
, 0 },
1143 /* 0x6e */ { NULL
, NULL
, 0 },
1144 /* 0x6f */ { NULL
, NULL
, 0 },
1145 /* 0x70 */ { "SMBtcon",reply_tcon
,0},
1146 /* 0x71 */ { "SMBtdis",reply_tdis
,DO_CHDIR
},
1147 /* 0x72 */ { "SMBnegprot",reply_negprot
,0},
1148 /* 0x73 */ { "SMBsesssetupX",reply_sesssetup_and_X
,0},
1149 /* 0x74 */ { "SMBulogoffX",reply_ulogoffX
, 0}, /* ulogoff doesn't give a valid TID */
1150 /* 0x75 */ { "SMBtconX",reply_tcon_and_X
,0},
1151 /* 0x76 */ { NULL
, NULL
, 0 },
1152 /* 0x77 */ { NULL
, NULL
, 0 },
1153 /* 0x78 */ { NULL
, NULL
, 0 },
1154 /* 0x79 */ { NULL
, NULL
, 0 },
1155 /* 0x7a */ { NULL
, NULL
, 0 },
1156 /* 0x7b */ { NULL
, NULL
, 0 },
1157 /* 0x7c */ { NULL
, NULL
, 0 },
1158 /* 0x7d */ { NULL
, NULL
, 0 },
1159 /* 0x7e */ { NULL
, NULL
, 0 },
1160 /* 0x7f */ { NULL
, NULL
, 0 },
1161 /* 0x80 */ { "SMBdskattr",reply_dskattr
,AS_USER
},
1162 /* 0x81 */ { "SMBsearch",reply_search
,AS_USER
},
1163 /* 0x82 */ { "SMBffirst",reply_search
,AS_USER
},
1164 /* 0x83 */ { "SMBfunique",reply_search
,AS_USER
},
1165 /* 0x84 */ { "SMBfclose",reply_fclose
,AS_USER
},
1166 /* 0x85 */ { NULL
, NULL
, 0 },
1167 /* 0x86 */ { NULL
, NULL
, 0 },
1168 /* 0x87 */ { NULL
, NULL
, 0 },
1169 /* 0x88 */ { NULL
, NULL
, 0 },
1170 /* 0x89 */ { NULL
, NULL
, 0 },
1171 /* 0x8a */ { NULL
, NULL
, 0 },
1172 /* 0x8b */ { NULL
, NULL
, 0 },
1173 /* 0x8c */ { NULL
, NULL
, 0 },
1174 /* 0x8d */ { NULL
, NULL
, 0 },
1175 /* 0x8e */ { NULL
, NULL
, 0 },
1176 /* 0x8f */ { NULL
, NULL
, 0 },
1177 /* 0x90 */ { NULL
, NULL
, 0 },
1178 /* 0x91 */ { NULL
, NULL
, 0 },
1179 /* 0x92 */ { NULL
, NULL
, 0 },
1180 /* 0x93 */ { NULL
, NULL
, 0 },
1181 /* 0x94 */ { NULL
, NULL
, 0 },
1182 /* 0x95 */ { NULL
, NULL
, 0 },
1183 /* 0x96 */ { NULL
, NULL
, 0 },
1184 /* 0x97 */ { NULL
, NULL
, 0 },
1185 /* 0x98 */ { NULL
, NULL
, 0 },
1186 /* 0x99 */ { NULL
, NULL
, 0 },
1187 /* 0x9a */ { NULL
, NULL
, 0 },
1188 /* 0x9b */ { NULL
, NULL
, 0 },
1189 /* 0x9c */ { NULL
, NULL
, 0 },
1190 /* 0x9d */ { NULL
, NULL
, 0 },
1191 /* 0x9e */ { NULL
, NULL
, 0 },
1192 /* 0x9f */ { NULL
, NULL
, 0 },
1193 /* 0xa0 */ { "SMBnttrans",reply_nttrans
, AS_USER
| CAN_IPC
},
1194 /* 0xa1 */ { "SMBnttranss",reply_nttranss
, AS_USER
| CAN_IPC
},
1195 /* 0xa2 */ { "SMBntcreateX",reply_ntcreate_and_X
, AS_USER
| CAN_IPC
},
1196 /* 0xa3 */ { NULL
, NULL
, 0 },
1197 /* 0xa4 */ { "SMBntcancel",reply_ntcancel
, 0 },
1198 /* 0xa5 */ { "SMBntrename",reply_ntrename
, AS_USER
| NEED_WRITE
},
1199 /* 0xa6 */ { NULL
, NULL
, 0 },
1200 /* 0xa7 */ { NULL
, NULL
, 0 },
1201 /* 0xa8 */ { NULL
, NULL
, 0 },
1202 /* 0xa9 */ { NULL
, NULL
, 0 },
1203 /* 0xaa */ { NULL
, NULL
, 0 },
1204 /* 0xab */ { NULL
, NULL
, 0 },
1205 /* 0xac */ { NULL
, NULL
, 0 },
1206 /* 0xad */ { NULL
, NULL
, 0 },
1207 /* 0xae */ { NULL
, NULL
, 0 },
1208 /* 0xaf */ { NULL
, NULL
, 0 },
1209 /* 0xb0 */ { NULL
, NULL
, 0 },
1210 /* 0xb1 */ { NULL
, NULL
, 0 },
1211 /* 0xb2 */ { NULL
, NULL
, 0 },
1212 /* 0xb3 */ { NULL
, NULL
, 0 },
1213 /* 0xb4 */ { NULL
, NULL
, 0 },
1214 /* 0xb5 */ { NULL
, NULL
, 0 },
1215 /* 0xb6 */ { NULL
, NULL
, 0 },
1216 /* 0xb7 */ { NULL
, NULL
, 0 },
1217 /* 0xb8 */ { NULL
, NULL
, 0 },
1218 /* 0xb9 */ { NULL
, NULL
, 0 },
1219 /* 0xba */ { NULL
, NULL
, 0 },
1220 /* 0xbb */ { NULL
, NULL
, 0 },
1221 /* 0xbc */ { NULL
, NULL
, 0 },
1222 /* 0xbd */ { NULL
, NULL
, 0 },
1223 /* 0xbe */ { NULL
, NULL
, 0 },
1224 /* 0xbf */ { NULL
, NULL
, 0 },
1225 /* 0xc0 */ { "SMBsplopen",reply_printopen
,AS_USER
},
1226 /* 0xc1 */ { "SMBsplwr",reply_printwrite
,AS_USER
},
1227 /* 0xc2 */ { "SMBsplclose",reply_printclose
,AS_USER
},
1228 /* 0xc3 */ { "SMBsplretq",reply_printqueue
,AS_USER
},
1229 /* 0xc4 */ { NULL
, NULL
, 0 },
1230 /* 0xc5 */ { NULL
, NULL
, 0 },
1231 /* 0xc6 */ { NULL
, NULL
, 0 },
1232 /* 0xc7 */ { NULL
, NULL
, 0 },
1233 /* 0xc8 */ { NULL
, NULL
, 0 },
1234 /* 0xc9 */ { NULL
, NULL
, 0 },
1235 /* 0xca */ { NULL
, NULL
, 0 },
1236 /* 0xcb */ { NULL
, NULL
, 0 },
1237 /* 0xcc */ { NULL
, NULL
, 0 },
1238 /* 0xcd */ { NULL
, NULL
, 0 },
1239 /* 0xce */ { NULL
, NULL
, 0 },
1240 /* 0xcf */ { NULL
, NULL
, 0 },
1241 /* 0xd0 */ { "SMBsends",reply_sends
,AS_GUEST
},
1242 /* 0xd1 */ { "SMBsendb", NULL
,AS_GUEST
},
1243 /* 0xd2 */ { "SMBfwdname", NULL
,AS_GUEST
},
1244 /* 0xd3 */ { "SMBcancelf", NULL
,AS_GUEST
},
1245 /* 0xd4 */ { "SMBgetmac", NULL
,AS_GUEST
},
1246 /* 0xd5 */ { "SMBsendstrt",reply_sendstrt
,AS_GUEST
},
1247 /* 0xd6 */ { "SMBsendend",reply_sendend
,AS_GUEST
},
1248 /* 0xd7 */ { "SMBsendtxt",reply_sendtxt
,AS_GUEST
},
1249 /* 0xd8 */ { NULL
, NULL
, 0 },
1250 /* 0xd9 */ { NULL
, NULL
, 0 },
1251 /* 0xda */ { NULL
, NULL
, 0 },
1252 /* 0xdb */ { NULL
, NULL
, 0 },
1253 /* 0xdc */ { NULL
, NULL
, 0 },
1254 /* 0xdd */ { NULL
, NULL
, 0 },
1255 /* 0xde */ { NULL
, NULL
, 0 },
1256 /* 0xdf */ { NULL
, NULL
, 0 },
1257 /* 0xe0 */ { NULL
, NULL
, 0 },
1258 /* 0xe1 */ { NULL
, NULL
, 0 },
1259 /* 0xe2 */ { NULL
, NULL
, 0 },
1260 /* 0xe3 */ { NULL
, NULL
, 0 },
1261 /* 0xe4 */ { NULL
, NULL
, 0 },
1262 /* 0xe5 */ { NULL
, NULL
, 0 },
1263 /* 0xe6 */ { NULL
, NULL
, 0 },
1264 /* 0xe7 */ { NULL
, NULL
, 0 },
1265 /* 0xe8 */ { NULL
, NULL
, 0 },
1266 /* 0xe9 */ { NULL
, NULL
, 0 },
1267 /* 0xea */ { NULL
, NULL
, 0 },
1268 /* 0xeb */ { NULL
, NULL
, 0 },
1269 /* 0xec */ { NULL
, NULL
, 0 },
1270 /* 0xed */ { NULL
, NULL
, 0 },
1271 /* 0xee */ { NULL
, NULL
, 0 },
1272 /* 0xef */ { NULL
, NULL
, 0 },
1273 /* 0xf0 */ { NULL
, NULL
, 0 },
1274 /* 0xf1 */ { NULL
, NULL
, 0 },
1275 /* 0xf2 */ { NULL
, NULL
, 0 },
1276 /* 0xf3 */ { NULL
, NULL
, 0 },
1277 /* 0xf4 */ { NULL
, NULL
, 0 },
1278 /* 0xf5 */ { NULL
, NULL
, 0 },
1279 /* 0xf6 */ { NULL
, NULL
, 0 },
1280 /* 0xf7 */ { NULL
, NULL
, 0 },
1281 /* 0xf8 */ { NULL
, NULL
, 0 },
1282 /* 0xf9 */ { NULL
, NULL
, 0 },
1283 /* 0xfa */ { NULL
, NULL
, 0 },
1284 /* 0xfb */ { NULL
, NULL
, 0 },
1285 /* 0xfc */ { NULL
, NULL
, 0 },
1286 /* 0xfd */ { NULL
, NULL
, 0 },
1287 /* 0xfe */ { NULL
, NULL
, 0 },
1288 /* 0xff */ { NULL
, NULL
, 0 }
1292 /*******************************************************************
1293 allocate and initialize a reply packet
1294 ********************************************************************/
1296 void reply_outbuf(struct smb_request
*req
, uint8 num_words
, uint32 num_bytes
)
1299 * Protect against integer wrap
1301 if ((num_bytes
> 0xffffff)
1302 || ((num_bytes
+ smb_size
+ num_words
*2) > 0xffffff)) {
1304 asprintf(&msg
, "num_bytes too large: %u",
1305 (unsigned)num_bytes
);
1309 if (!(req
->outbuf
= TALLOC_ARRAY(
1311 smb_size
+ num_words
*2 + num_bytes
))) {
1312 smb_panic("could not allocate output buffer\n");
1315 construct_reply_common((char *)req
->inbuf
, (char *)req
->outbuf
);
1316 srv_set_message((char *)req
->outbuf
, num_words
, num_bytes
, false);
1318 * Zero out the word area, the caller has to take care of the bcc area
1321 if (num_words
!= 0) {
1322 memset(req
->outbuf
+ smb_vwv0
, 0, num_words
*2);
1329 /*******************************************************************
1330 Dump a packet to a file.
1331 ********************************************************************/
1333 static void smb_dump(const char *name
, int type
, const char *data
, ssize_t len
)
1337 if (DEBUGLEVEL
< 50) {
1341 if (len
< 4) len
= smb_len(data
)+4;
1342 for (i
=1;i
<100;i
++) {
1343 asprintf(&fname
, "/tmp/%s.%d.%s", name
, i
,
1344 type
? "req" : "resp");
1348 fd
= open(fname
, O_WRONLY
|O_CREAT
|O_EXCL
, 0644);
1349 if (fd
!= -1 || errno
!= EEXIST
) break;
1352 ssize_t ret
= write(fd
, data
, len
);
1354 DEBUG(0,("smb_dump: problem: write returned %d\n", (int)ret
));
1356 DEBUG(0,("created %s len %lu\n", fname
, (unsigned long)len
));
1361 /****************************************************************************
1362 Prepare everything for calling the actual request function, and potentially
1363 call the request function via the "new" interface.
1365 Return False if the "legacy" function needs to be called, everything is
1368 Return True if we're done.
1370 I know this API sucks, but it is the one with the least code change I could
1372 ****************************************************************************/
1374 static connection_struct
*switch_message(uint8 type
, struct smb_request
*req
, int size
)
1378 connection_struct
*conn
= NULL
;
1380 static uint16 last_session_tag
= UID_FIELD_INVALID
;
1384 /* Make sure this is an SMB packet. smb_size contains NetBIOS header
1385 * so subtract 4 from it. */
1386 if (!valid_smb_header(req
->inbuf
)
1387 || (size
< (smb_size
- 4))) {
1388 DEBUG(2,("Non-SMB packet of length %d. Terminating server\n",
1389 smb_len(req
->inbuf
)));
1390 exit_server_cleanly("Non-SMB packet");
1393 if (smb_messages
[type
].fn_new
== NULL
) {
1394 DEBUG(0,("Unknown message type %d!\n",type
));
1395 smb_dump("Unknown", 1, (char *)req
->inbuf
, size
);
1396 reply_unknown_new(req
, type
);
1400 flags
= smb_messages
[type
].flags
;
1402 /* In share mode security we must ignore the vuid. */
1403 session_tag
= (lp_security() == SEC_SHARE
)
1404 ? UID_FIELD_INVALID
: req
->vuid
;
1407 DEBUG(3,("switch message %s (pid %d) conn 0x%lx\n", smb_fn_name(type
),
1408 (int)sys_getpid(), (unsigned long)conn
));
1410 smb_dump(smb_fn_name(type
), 1, (char *)req
->inbuf
, size
);
1412 /* Ensure this value is replaced in the incoming packet. */
1413 SSVAL(req
->inbuf
,smb_uid
,session_tag
);
1416 * Ensure the correct username is in current_user_info. This is a
1417 * really ugly bugfix for problems with multiple session_setup_and_X's
1418 * being done and allowing %U and %G substitutions to work correctly.
1419 * There is a reason this code is done here, don't move it unless you
1420 * know what you're doing... :-).
1424 if (session_tag
!= last_session_tag
) {
1425 user_struct
*vuser
= NULL
;
1427 last_session_tag
= session_tag
;
1428 if(session_tag
!= UID_FIELD_INVALID
) {
1429 vuser
= get_valid_user_struct(session_tag
);
1431 set_current_user_info(&vuser
->user
);
1436 /* Does this call need to be run as the connected user? */
1437 if (flags
& AS_USER
) {
1439 /* Does this call need a valid tree connection? */
1442 * Amazingly, the error code depends on the command
1445 if (type
== SMBntcreateX
) {
1446 reply_nterror(req
, NT_STATUS_INVALID_HANDLE
);
1448 reply_doserror(req
, ERRSRV
, ERRinvnid
);
1453 if (!change_to_user(conn
,session_tag
)) {
1454 reply_nterror(req
, NT_STATUS_DOS(ERRSRV
, ERRbaduid
));
1458 /* All NEED_WRITE and CAN_IPC flags must also have AS_USER. */
1460 /* Does it need write permission? */
1461 if ((flags
& NEED_WRITE
) && !CAN_WRITE(conn
)) {
1462 reply_nterror(req
, NT_STATUS_MEDIA_WRITE_PROTECTED
);
1466 /* IPC services are limited */
1467 if (IS_IPC(conn
) && !(flags
& CAN_IPC
)) {
1468 reply_doserror(req
, ERRSRV
,ERRaccess
);
1472 /* This call needs to be run as root */
1473 change_to_root_user();
1476 /* load service specific parameters */
1478 if (req
->encrypted
) {
1479 conn
->encrypted_tid
= true;
1480 /* encrypted required from now on. */
1481 conn
->encrypt_level
= Required
;
1482 } else if (ENCRYPTION_REQUIRED(conn
)) {
1483 uint8 com
= CVAL(req
->inbuf
,smb_com
);
1484 if (com
!= SMBtrans2
&& com
!= SMBtranss2
) {
1485 exit_server_cleanly("encryption required "
1491 if (!set_current_service(conn
,SVAL(req
->inbuf
,smb_flg
),
1492 (flags
& (AS_USER
|DO_CHDIR
)
1494 reply_doserror(req
, ERRSRV
, ERRaccess
);
1497 conn
->num_smb_operations
++;
1500 /* does this protocol need to be run as guest? */
1501 if ((flags
& AS_GUEST
)
1502 && (!change_to_guest() ||
1503 !check_access(smbd_server_fd(), lp_hostsallow(-1),
1504 lp_hostsdeny(-1)))) {
1505 reply_doserror(req
, ERRSRV
, ERRaccess
);
1509 smb_messages
[type
].fn_new(req
);
1513 /****************************************************************************
1514 Construct a reply to the incoming packet.
1515 ****************************************************************************/
1517 static void construct_reply(char *inbuf
, int size
, size_t unread_bytes
, bool encrypted
)
1519 uint8 type
= CVAL(inbuf
,smb_com
);
1520 connection_struct
*conn
;
1521 struct smb_request
*req
;
1527 if (!(req
= talloc(talloc_tos(), struct smb_request
))) {
1528 smb_panic("could not allocate smb_request");
1530 init_smb_request(req
, (uint8
*)inbuf
, unread_bytes
, encrypted
);
1532 conn
= switch_message(type
, req
, size
);
1534 if (req
->unread_bytes
) {
1535 /* writeX failed. drain socket. */
1536 if (drain_socket(smbd_server_fd(), req
->unread_bytes
) !=
1537 req
->unread_bytes
) {
1538 smb_panic("failed to drain pending bytes");
1540 req
->unread_bytes
= 0;
1543 if (req
->outbuf
== NULL
) {
1547 if (CVAL(req
->outbuf
,0) == 0) {
1548 show_msg((char *)req
->outbuf
);
1551 if (!srv_send_smb(smbd_server_fd(),
1552 (char *)req
->outbuf
,
1553 IS_CONN_ENCRYPTED(conn
)||req
->encrypted
)) {
1554 exit_server_cleanly("construct_reply: srv_send_smb failed.");
1562 /****************************************************************************
1563 Process an smb from the client
1564 ****************************************************************************/
1566 static void process_smb(char *inbuf
, size_t nread
, size_t unread_bytes
, bool encrypted
)
1568 static int trans_num
;
1569 int msg_type
= CVAL(inbuf
,0);
1571 DO_PROFILE_INC(smb_count
);
1573 if (trans_num
== 0) {
1574 char addr
[INET6_ADDRSTRLEN
];
1576 /* on the first packet, check the global hosts allow/ hosts
1577 deny parameters before doing any parsing of the packet
1578 passed to us by the client. This prevents attacks on our
1579 parsing code from hosts not in the hosts allow list */
1581 if (!check_access(smbd_server_fd(), lp_hostsallow(-1),
1582 lp_hostsdeny(-1))) {
1583 /* send a negative session response "not listening on calling name" */
1584 static unsigned char buf
[5] = {0x83, 0, 0, 1, 0x81};
1585 DEBUG( 1, ( "Connection denied from %s\n",
1586 client_addr(get_client_fd(),addr
,sizeof(addr
)) ) );
1587 (void)srv_send_smb(smbd_server_fd(),(char *)buf
,false);
1588 exit_server_cleanly("connection denied");
1592 DEBUG( 6, ( "got message type 0x%x of len 0x%x\n", msg_type
,
1594 DEBUG( 3, ( "Transaction %d of length %d (%u toread)\n", trans_num
,
1596 (unsigned int)unread_bytes
));
1598 if (msg_type
!= 0) {
1600 * NetBIOS session request, keepalive, etc.
1602 reply_special(inbuf
);
1608 construct_reply(inbuf
,nread
,unread_bytes
,encrypted
);
1613 /****************************************************************************
1614 Return a string containing the function name of a SMB command.
1615 ****************************************************************************/
1617 const char *smb_fn_name(int type
)
1619 const char *unknown_name
= "SMBunknown";
1621 if (smb_messages
[type
].name
== NULL
)
1622 return(unknown_name
);
1624 return(smb_messages
[type
].name
);
1627 /****************************************************************************
1628 Helper functions for contruct_reply.
1629 ****************************************************************************/
1631 static uint32 common_flags2
= FLAGS2_LONG_PATH_COMPONENTS
|FLAGS2_32_BIT_ERROR_CODES
;
1633 void add_to_common_flags2(uint32 v
)
1638 void remove_from_common_flags2(uint32 v
)
1640 common_flags2
&= ~v
;
1643 void construct_reply_common(const char *inbuf
, char *outbuf
)
1645 srv_set_message(outbuf
,0,0,false);
1647 SCVAL(outbuf
,smb_com
,CVAL(inbuf
,smb_com
));
1648 SIVAL(outbuf
,smb_rcls
,0);
1649 SCVAL(outbuf
,smb_flg
, FLAG_REPLY
| (CVAL(inbuf
,smb_flg
) & FLAG_CASELESS_PATHNAMES
));
1650 SSVAL(outbuf
,smb_flg2
,
1651 (SVAL(inbuf
,smb_flg2
) & FLAGS2_UNICODE_STRINGS
) |
1653 memset(outbuf
+smb_pidhigh
,'\0',(smb_tid
-smb_pidhigh
));
1655 SSVAL(outbuf
,smb_tid
,SVAL(inbuf
,smb_tid
));
1656 SSVAL(outbuf
,smb_pid
,SVAL(inbuf
,smb_pid
));
1657 SSVAL(outbuf
,smb_uid
,SVAL(inbuf
,smb_uid
));
1658 SSVAL(outbuf
,smb_mid
,SVAL(inbuf
,smb_mid
));
1661 /****************************************************************************
1662 Construct a chained reply and add it to the already made reply
1663 ****************************************************************************/
1665 void chain_reply(struct smb_request
*req
)
1667 static char *orig_inbuf
;
1670 * Dirty little const_discard: We mess with req->inbuf, which is
1671 * declared as const. If maybe at some point this routine gets
1672 * rewritten, this const_discard could go away.
1674 char *inbuf
= CONST_DISCARD(char *, req
->inbuf
);
1675 int size
= smb_len(req
->inbuf
)+4;
1677 int smb_com1
, smb_com2
= CVAL(inbuf
,smb_vwv0
);
1678 unsigned smb_off2
= SVAL(inbuf
,smb_vwv1
);
1682 char inbuf_saved
[smb_wct
];
1683 char *outbuf
= (char *)req
->outbuf
;
1684 size_t outsize
= smb_len(outbuf
) + 4;
1685 size_t outsize_padded
;
1686 size_t ofs
, to_move
;
1688 struct smb_request
*req2
;
1689 size_t caller_outputlen
;
1690 char *caller_output
;
1692 /* Maybe its not chained, or it's an error packet. */
1693 if (smb_com2
== 0xFF || SVAL(outbuf
,smb_rcls
) != 0) {
1694 SCVAL(outbuf
,smb_vwv0
,0xFF);
1698 if (chain_size
== 0) {
1699 /* this is the first part of the chain */
1704 * We need to save the output the caller added to the chain so that we
1705 * can splice it into the final output buffer later.
1708 caller_outputlen
= outsize
- smb_wct
;
1710 caller_output
= (char *)memdup(outbuf
+ smb_wct
, caller_outputlen
);
1712 if (caller_output
== NULL
) {
1713 /* TODO: NT_STATUS_NO_MEMORY */
1714 smb_panic("could not dup outbuf");
1718 * The original Win95 redirector dies on a reply to
1719 * a lockingX and read chain unless the chain reply is
1720 * 4 byte aligned. JRA.
1723 outsize_padded
= (outsize
+ 3) & ~3;
1726 * remember how much the caller added to the chain, only counting
1727 * stuff after the parameter words
1729 chain_size
+= outsize_padded
- smb_wct
;
1732 * work out pointers into the original packets. The
1733 * headers on these need to be filled in
1735 inbuf2
= orig_inbuf
+ smb_off2
+ 4 - smb_wct
;
1737 /* remember the original command type */
1738 smb_com1
= CVAL(orig_inbuf
,smb_com
);
1740 /* save the data which will be overwritten by the new headers */
1741 memcpy(inbuf_saved
,inbuf2
,smb_wct
);
1743 /* give the new packet the same header as the last part of the SMB */
1744 memmove(inbuf2
,inbuf
,smb_wct
);
1746 /* create the in buffer */
1747 SCVAL(inbuf2
,smb_com
,smb_com2
);
1749 /* work out the new size for the in buffer. */
1750 new_size
= size
- (inbuf2
- inbuf
);
1752 DEBUG(0,("chain_reply: chain packet size incorrect "
1753 "(orig size = %d, offset = %d)\n",
1754 size
, (int)(inbuf2
- inbuf
) ));
1755 exit_server_cleanly("Bad chained packet");
1759 /* And set it in the header. */
1760 smb_setlen(inbuf2
, new_size
- 4);
1762 DEBUG(3,("Chained message\n"));
1765 if (!(req2
= talloc(talloc_tos(), struct smb_request
))) {
1766 smb_panic("could not allocate smb_request");
1768 init_smb_request(req2
, (uint8
*)inbuf2
,0, req
->encrypted
);
1770 /* process the request */
1771 switch_message(smb_com2
, req2
, new_size
);
1774 * We don't accept deferred operations in chained requests.
1776 SMB_ASSERT(req2
->outbuf
!= NULL
);
1777 outsize2
= smb_len(req2
->outbuf
)+4;
1780 * Move away the new command output so that caller_output fits in,
1781 * copy in the caller_output saved above.
1784 SMB_ASSERT(outsize_padded
>= smb_wct
);
1787 * "ofs" is the space we need for caller_output. Equal to
1788 * caller_outputlen plus the padding.
1791 ofs
= outsize_padded
- smb_wct
;
1794 * "to_move" is the amount of bytes the secondary routine gave us
1797 to_move
= outsize2
- smb_wct
;
1799 if (to_move
+ ofs
+ smb_wct
+ chain_size
> max_send
) {
1800 smb_panic("replies too large -- would have to cut");
1804 * In the "new" API "outbuf" is allocated via reply_outbuf, just for
1805 * the first request in the chain. So we have to re-allocate it. In
1806 * the "old" API the only outbuf ever used is the global OutBuffer
1807 * which is always large enough.
1810 outbuf
= TALLOC_REALLOC_ARRAY(NULL
, outbuf
, char,
1811 to_move
+ ofs
+ smb_wct
);
1812 if (outbuf
== NULL
) {
1813 smb_panic("could not realloc outbuf");
1816 req
->outbuf
= (uint8
*)outbuf
;
1818 memmove(outbuf
+ smb_wct
+ ofs
, req2
->outbuf
+ smb_wct
, to_move
);
1819 memcpy(outbuf
+ smb_wct
, caller_output
, caller_outputlen
);
1822 * copy the new reply header over the old one but preserve the smb_com
1825 memmove(outbuf
, req2
->outbuf
, smb_wct
);
1826 SCVAL(outbuf
, smb_com
, smb_com1
);
1829 * We've just copied in the whole "wct" area from the secondary
1830 * function. Fix up the chaining: com2 and the offset need to be
1834 SCVAL(outbuf
, smb_vwv0
, smb_com2
);
1835 SSVAL(outbuf
, smb_vwv1
, chain_size
+ smb_wct
- 4);
1837 if (outsize_padded
> outsize
) {
1840 * Due to padding we have some uninitialized bytes after the
1844 memset(outbuf
+ outsize
, 0, outsize_padded
- outsize
);
1847 smb_setlen(outbuf
, outsize2
+ chain_size
- 4);
1850 * restore the saved data, being careful not to overwrite any data
1851 * from the reply header
1853 memcpy(inbuf2
,inbuf_saved
,smb_wct
);
1855 SAFE_FREE(caller_output
);
1861 /****************************************************************************
1862 Setup the needed select timeout in milliseconds.
1863 ****************************************************************************/
1865 static int setup_select_timeout(void)
1869 select_timeout
= SMBD_SELECT_TIMEOUT
*1000;
1871 if (print_notify_messages_pending()) {
1872 select_timeout
= MIN(select_timeout
, 1000);
1875 return select_timeout
;
1878 /****************************************************************************
1879 Check if services need reloading.
1880 ****************************************************************************/
1882 void check_reload(time_t t
)
1884 static pid_t mypid
= 0;
1885 static time_t last_smb_conf_reload_time
= 0;
1886 static time_t last_printer_reload_time
= 0;
1887 time_t printcap_cache_time
= (time_t)lp_printcap_cache_time();
1889 if(last_smb_conf_reload_time
== 0) {
1890 last_smb_conf_reload_time
= t
;
1891 /* Our printing subsystem might not be ready at smbd start up.
1892 Then no printer is available till the first printers check
1893 is performed. A lower initial interval circumvents this. */
1894 if ( printcap_cache_time
> 60 )
1895 last_printer_reload_time
= t
- printcap_cache_time
+ 60;
1897 last_printer_reload_time
= t
;
1900 if (mypid
!= getpid()) { /* First time or fork happened meanwhile */
1901 /* randomize over 60 second the printcap reload to avoid all
1902 * process hitting cupsd at the same time */
1903 int time_range
= 60;
1905 last_printer_reload_time
+= random() % time_range
;
1909 if (reload_after_sighup
|| (t
>= last_smb_conf_reload_time
+SMBD_RELOAD_CHECK
)) {
1910 reload_services(True
);
1911 reload_after_sighup
= False
;
1912 last_smb_conf_reload_time
= t
;
1915 /* 'printcap cache time = 0' disable the feature */
1917 if ( printcap_cache_time
!= 0 )
1919 /* see if it's time to reload or if the clock has been set back */
1921 if ( (t
>= last_printer_reload_time
+printcap_cache_time
)
1922 || (t
-last_printer_reload_time
< 0) )
1924 DEBUG( 3,( "Printcap cache time expired.\n"));
1926 last_printer_reload_time
= t
;
1931 /****************************************************************************
1932 Process any timeout housekeeping. Return False if the caller should exit.
1933 ****************************************************************************/
1935 static bool timeout_processing(int *select_timeout
,
1936 time_t *last_timeout_processing_time
)
1940 if (*get_srv_read_error() == SMB_READ_EOF
) {
1941 DEBUG(3,("timeout_processing: End of file from client (client has disconnected).\n"));
1945 if (*get_srv_read_error() == SMB_READ_ERROR
) {
1946 DEBUG(3,("timeout_processing: receive_smb error (%s) Exiting\n",
1951 if (*get_srv_read_error() == SMB_READ_BAD_SIG
) {
1952 DEBUG(3,("timeout_processing: receive_smb error bad smb signature. Exiting\n"));
1956 *last_timeout_processing_time
= t
= time(NULL
);
1958 /* become root again if waiting */
1959 change_to_root_user();
1961 /* check if we need to reload services */
1964 if(global_machine_password_needs_changing
&&
1965 /* for ADS we need to do a regular ADS password change, not a domain
1967 lp_security() == SEC_DOMAIN
) {
1969 unsigned char trust_passwd_hash
[16];
1973 * We're in domain level security, and the code that
1974 * read the machine password flagged that the machine
1975 * password needs changing.
1979 * First, open the machine password file with an exclusive lock.
1982 if (secrets_lock_trust_account_password(lp_workgroup(), True
) == False
) {
1983 DEBUG(0,("process: unable to lock the machine account password for \
1984 machine %s in domain %s.\n", global_myname(), lp_workgroup() ));
1988 if(!secrets_fetch_trust_account_password(lp_workgroup(), trust_passwd_hash
, &lct
, NULL
)) {
1989 DEBUG(0,("process: unable to read the machine account password for \
1990 machine %s in domain %s.\n", global_myname(), lp_workgroup()));
1991 secrets_lock_trust_account_password(lp_workgroup(), False
);
1996 * Make sure someone else hasn't already done this.
1999 if(t
< lct
+ lp_machine_password_timeout()) {
2000 global_machine_password_needs_changing
= False
;
2001 secrets_lock_trust_account_password(lp_workgroup(), False
);
2005 /* always just contact the PDC here */
2007 change_trust_account_password( lp_workgroup(), NULL
);
2008 global_machine_password_needs_changing
= False
;
2009 secrets_lock_trust_account_password(lp_workgroup(), False
);
2012 /* update printer queue caches if necessary */
2014 update_monitored_printq_cache();
2017 * Now we are root, check if the log files need pruning.
2018 * Force a log file check.
2020 force_check_log_size();
2023 /* Send any queued printer notify message to interested smbd's. */
2025 print_notify_send_messages(smbd_messaging_context(), 0);
2028 * Modify the select timeout depending upon
2029 * what we have remaining in our queues.
2032 *select_timeout
= setup_select_timeout();
2037 /****************************************************************************
2038 Process commands from the client
2039 ****************************************************************************/
2041 void smbd_process(void)
2043 time_t last_timeout_processing_time
= time(NULL
);
2044 unsigned int num_smbs
= 0;
2045 size_t unread_bytes
= 0;
2047 max_recv
= MIN(lp_maxxmit(),BUFFER_SIZE
);
2050 int select_timeout
= setup_select_timeout();
2054 bool encrypted
= false;
2055 TALLOC_CTX
*frame
= talloc_stackframe_pool(8192);
2059 /* Did someone ask for immediate checks on things like blocking locks ? */
2060 if (select_timeout
== 0) {
2061 if(!timeout_processing(&select_timeout
,
2062 &last_timeout_processing_time
))
2064 num_smbs
= 0; /* Reset smb counter. */
2067 run_events(smbd_event_context(), 0, NULL
, NULL
);
2069 while (!receive_message_or_smb(talloc_tos(), &inbuf
, &inbuf_len
,
2073 if(!timeout_processing(&select_timeout
,
2074 &last_timeout_processing_time
))
2076 num_smbs
= 0; /* Reset smb counter. */
2081 * Ensure we do timeout processing if the SMB we just got was
2082 * only an echo request. This allows us to set the select
2083 * timeout in 'receive_message_or_smb()' to any value we like
2084 * without worrying that the client will send echo requests
2085 * faster than the select timeout, thus starving out the
2086 * essential processing (change notify, blocking locks) that
2087 * the timeout code does. JRA.
2089 num_echos
= smb_echo_count
;
2091 process_smb(inbuf
, inbuf_len
, unread_bytes
, encrypted
);
2095 if (smb_echo_count
!= num_echos
) {
2096 if(!timeout_processing( &select_timeout
, &last_timeout_processing_time
))
2098 num_smbs
= 0; /* Reset smb counter. */
2104 * If we are getting smb requests in a constant stream
2105 * with no echos, make sure we attempt timeout processing
2106 * every select_timeout milliseconds - but only check for this
2107 * every 200 smb requests.
2110 if ((num_smbs
% 200) == 0) {
2111 time_t new_check_time
= time(NULL
);
2112 if(new_check_time
- last_timeout_processing_time
>= (select_timeout
/1000)) {
2113 if(!timeout_processing(
2115 &last_timeout_processing_time
))
2117 num_smbs
= 0; /* Reset smb counter. */
2118 last_timeout_processing_time
= new_check_time
; /* Reset time. */
2122 /* The timeout_processing function isn't run nearly
2123 often enough to implement 'max log size' without
2124 overrunning the size of the file by many megabytes.
2125 This is especially true if we are running at debug
2126 level 10. Checking every 50 SMBs is a nice
2127 tradeoff of performance vs log file size overrun. */
2129 if ((num_smbs
% 50) == 0 && need_to_check_log_size()) {
2130 change_to_root_user();