2 Unix SMB/CIFS implementation.
3 process incoming packets - main loop
4 Copyright (C) Andrew Tridgell 1992-1998
5 Copyright (C) Volker Lendecke 2005-2007
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 3 of the License, or
10 (at your option) any later version.
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with this program. If not, see <http://www.gnu.org/licenses/>.
23 extern int smb_echo_count
;
26 * Size of data we can send to client. Set
27 * by the client for all protocols above CORE.
28 * Set by us for CORE protocol.
30 int max_send
= BUFFER_SIZE
;
32 * Size of the data we can receive. Set by us.
33 * Can be modified by the max xmit parameter.
35 int max_recv
= BUFFER_SIZE
;
37 SIG_ATOMIC_T reload_after_sighup
= 0;
38 SIG_ATOMIC_T got_sig_term
= 0;
39 extern bool global_machine_password_needs_changing
;
42 /* Accessor function for smb_read_error for smbd functions. */
44 /****************************************************************************
46 ****************************************************************************/
48 bool srv_send_smb(int fd
, char *buffer
, bool do_encrypt
)
53 char *buf_out
= buffer
;
55 /* Sign the outgoing packet if required. */
56 srv_calculate_sign_mac(buf_out
);
59 NTSTATUS status
= srv_encrypt_buffer(buffer
, &buf_out
);
60 if (!NT_STATUS_IS_OK(status
)) {
61 DEBUG(0, ("send_smb: SMB encryption failed "
62 "on outgoing packet! Error %s\n",
68 len
= smb_len(buf_out
) + 4;
70 while (nwritten
< len
) {
71 ret
= write_data(fd
,buf_out
+nwritten
,len
- nwritten
);
73 DEBUG(0,("Error writing %d bytes to client. %d. (%s)\n",
74 (int)len
,(int)ret
, strerror(errno
) ));
75 srv_free_enc_buffer(buf_out
);
81 srv_free_enc_buffer(buf_out
);
85 /*******************************************************************
86 Setup the word count and byte count for a smb message.
87 ********************************************************************/
89 int srv_set_message(char *buf
,
94 if (zero
&& (num_words
|| num_bytes
)) {
95 memset(buf
+ smb_size
,'\0',num_words
*2 + num_bytes
);
97 SCVAL(buf
,smb_wct
,num_words
);
98 SSVAL(buf
,smb_vwv
+ num_words
*SIZEOFWORD
,num_bytes
);
99 smb_setlen(buf
,(smb_size
+ num_words
*2 + num_bytes
- 4));
100 return (smb_size
+ num_words
*2 + num_bytes
);
103 static bool valid_smb_header(const uint8_t *inbuf
)
105 if (is_encrypted_packet(inbuf
)) {
109 * This used to be (strncmp(smb_base(inbuf),"\377SMB",4) == 0)
110 * but it just looks weird to call strncmp for this one.
112 return (IVAL(smb_base(inbuf
), 0) == 0x424D53FF);
115 /* Socket functions for smbd packet processing. */
117 static bool valid_packet_size(size_t len
)
120 * A WRITEX with CAP_LARGE_WRITEX can be 64k worth of data plus 65 bytes
121 * of header. Don't print the error if this fits.... JRA.
124 if (len
> (BUFFER_SIZE
+ LARGE_WRITEX_HDR_SIZE
)) {
125 DEBUG(0,("Invalid packet length! (%lu bytes).\n",
126 (unsigned long)len
));
132 static NTSTATUS
read_packet_remainder(int fd
, char *buffer
,
133 unsigned int timeout
, ssize_t len
)
139 return read_socket_with_timeout(fd
, buffer
, len
, len
, timeout
, NULL
);
142 /****************************************************************************
143 Attempt a zerocopy writeX read. We know here that len > smb_size-4
144 ****************************************************************************/
147 * Unfortunately, earlier versions of smbclient/libsmbclient
148 * don't send this "standard" writeX header. I've fixed this
149 * for 3.2 but we'll use the old method with earlier versions.
150 * Windows and CIFSFS at least use this standard size. Not
154 #define STANDARD_WRITE_AND_X_HEADER_SIZE (smb_size - 4 + /* basic header */ \
155 (2*14) + /* word count (including bcc) */ \
158 static NTSTATUS
receive_smb_raw_talloc_partial_read(TALLOC_CTX
*mem_ctx
,
160 int fd
, char **buffer
,
161 unsigned int timeout
,
165 /* Size of a WRITEX call (+4 byte len). */
166 char writeX_header
[4 + STANDARD_WRITE_AND_X_HEADER_SIZE
];
167 ssize_t len
= smb_len_large(lenbuf
); /* Could be a UNIX large writeX. */
171 memcpy(writeX_header
, lenbuf
, 4);
173 status
= read_socket_with_timeout(
174 fd
, writeX_header
+ 4,
175 STANDARD_WRITE_AND_X_HEADER_SIZE
,
176 STANDARD_WRITE_AND_X_HEADER_SIZE
,
179 if (!NT_STATUS_IS_OK(status
)) {
184 * Ok - now try and see if this is a possible
188 if (is_valid_writeX_buffer((uint8_t *)writeX_header
)) {
190 * If the data offset is beyond what
191 * we've read, drain the extra bytes.
193 uint16_t doff
= SVAL(writeX_header
,smb_vwv11
);
196 if (doff
> STANDARD_WRITE_AND_X_HEADER_SIZE
) {
197 size_t drain
= doff
- STANDARD_WRITE_AND_X_HEADER_SIZE
;
198 if (drain_socket(smbd_server_fd(), drain
) != drain
) {
199 smb_panic("receive_smb_raw_talloc_partial_read:"
200 " failed to drain pending bytes");
203 doff
= STANDARD_WRITE_AND_X_HEADER_SIZE
;
206 /* Spoof down the length and null out the bcc. */
207 set_message_bcc(writeX_header
, 0);
208 newlen
= smb_len(writeX_header
);
210 /* Copy the header we've written. */
212 *buffer
= (char *)TALLOC_MEMDUP(mem_ctx
,
214 sizeof(writeX_header
));
216 if (*buffer
== NULL
) {
217 DEBUG(0, ("Could not allocate inbuf of length %d\n",
218 (int)sizeof(writeX_header
)));
219 return NT_STATUS_NO_MEMORY
;
222 /* Work out the remaining bytes. */
223 *p_unread
= len
- STANDARD_WRITE_AND_X_HEADER_SIZE
;
224 *len_ret
= newlen
+ 4;
228 if (!valid_packet_size(len
)) {
229 return NT_STATUS_INVALID_PARAMETER
;
233 * Not a valid writeX call. Just do the standard
237 *buffer
= TALLOC_ARRAY(mem_ctx
, char, len
+4);
239 if (*buffer
== NULL
) {
240 DEBUG(0, ("Could not allocate inbuf of length %d\n",
242 return NT_STATUS_NO_MEMORY
;
245 /* Copy in what we already read. */
248 4 + STANDARD_WRITE_AND_X_HEADER_SIZE
);
249 toread
= len
- STANDARD_WRITE_AND_X_HEADER_SIZE
;
252 status
= read_packet_remainder(
253 fd
, (*buffer
) + 4 + STANDARD_WRITE_AND_X_HEADER_SIZE
,
256 if (!NT_STATUS_IS_OK(status
)) {
257 DEBUG(10, ("receive_smb_raw_talloc_partial_read: %s\n",
267 static NTSTATUS
receive_smb_raw_talloc(TALLOC_CTX
*mem_ctx
, int fd
,
268 char **buffer
, unsigned int timeout
,
269 size_t *p_unread
, size_t *plen
)
273 int min_recv_size
= lp_min_receive_file_size();
278 status
= read_smb_length_return_keepalive(fd
, lenbuf
, timeout
, &len
);
279 if (!NT_STATUS_IS_OK(status
)) {
280 DEBUG(10, ("receive_smb_raw: %s\n", nt_errstr(status
)));
284 if (CVAL(lenbuf
,0) == 0 &&
286 smb_len_large(lenbuf
) > (min_recv_size
+ STANDARD_WRITE_AND_X_HEADER_SIZE
) && /* Could be a UNIX large writeX. */
287 !srv_is_signing_active()) {
289 return receive_smb_raw_talloc_partial_read(
290 mem_ctx
, lenbuf
, fd
, buffer
, timeout
, p_unread
, plen
);
293 if (!valid_packet_size(len
)) {
294 return NT_STATUS_INVALID_PARAMETER
;
298 * The +4 here can't wrap, we've checked the length above already.
301 *buffer
= TALLOC_ARRAY(mem_ctx
, char, len
+4);
303 if (*buffer
== NULL
) {
304 DEBUG(0, ("Could not allocate inbuf of length %d\n",
306 return NT_STATUS_NO_MEMORY
;
309 memcpy(*buffer
, lenbuf
, sizeof(lenbuf
));
311 status
= read_packet_remainder(fd
, (*buffer
)+4, timeout
, len
);
312 if (!NT_STATUS_IS_OK(status
)) {
320 static NTSTATUS
receive_smb_talloc(TALLOC_CTX
*mem_ctx
, int fd
,
321 char **buffer
, unsigned int timeout
,
322 size_t *p_unread
, bool *p_encrypted
,
328 *p_encrypted
= false;
330 status
= receive_smb_raw_talloc(mem_ctx
, fd
, buffer
, timeout
,
332 if (!NT_STATUS_IS_OK(status
)) {
336 if (is_encrypted_packet((uint8_t *)*buffer
)) {
337 status
= srv_decrypt_buffer(*buffer
);
338 if (!NT_STATUS_IS_OK(status
)) {
339 DEBUG(0, ("receive_smb_talloc: SMB decryption failed on "
340 "incoming packet! Error %s\n",
341 nt_errstr(status
) ));
347 /* Check the incoming SMB signature. */
348 if (!srv_check_sign_mac(*buffer
, true)) {
349 DEBUG(0, ("receive_smb: SMB Signature verification failed on "
350 "incoming packet!\n"));
351 return NT_STATUS_INVALID_NETWORK_RESPONSE
;
359 * Initialize a struct smb_request from an inbuf
362 void init_smb_request(struct smb_request
*req
,
367 size_t req_size
= smb_len(inbuf
) + 4;
368 /* Ensure we have at least smb_size bytes. */
369 if (req_size
< smb_size
) {
370 DEBUG(0,("init_smb_request: invalid request size %u\n",
371 (unsigned int)req_size
));
372 exit_server_cleanly("Invalid SMB request");
374 req
->flags2
= SVAL(inbuf
, smb_flg2
);
375 req
->smbpid
= SVAL(inbuf
, smb_pid
);
376 req
->mid
= SVAL(inbuf
, smb_mid
);
377 req
->vuid
= SVAL(inbuf
, smb_uid
);
378 req
->tid
= SVAL(inbuf
, smb_tid
);
379 req
->wct
= CVAL(inbuf
, smb_wct
);
380 req
->unread_bytes
= unread_bytes
;
381 req
->encrypted
= encrypted
;
382 req
->conn
= conn_find(req
->tid
);
384 /* Ensure we have at least wct words and 2 bytes of bcc. */
385 if (smb_size
+ req
->wct
*2 > req_size
) {
386 DEBUG(0,("init_smb_request: invalid wct number %u (size %u)\n",
387 (unsigned int)req
->wct
,
388 (unsigned int)req_size
));
389 exit_server_cleanly("Invalid SMB request");
391 /* Ensure bcc is correct. */
392 if (((uint8
*)smb_buf(inbuf
)) + smb_buflen(inbuf
) > inbuf
+ req_size
) {
393 DEBUG(0,("init_smb_request: invalid bcc number %u "
394 "(wct = %u, size %u)\n",
395 (unsigned int)smb_buflen(inbuf
),
396 (unsigned int)req
->wct
,
397 (unsigned int)req_size
));
398 exit_server_cleanly("Invalid SMB request");
404 /****************************************************************************
405 structure to hold a linked list of queued messages.
407 ****************************************************************************/
409 static struct pending_message_list
*deferred_open_queue
;
411 /****************************************************************************
412 Function to push a message onto the tail of a linked list of smb messages ready
414 ****************************************************************************/
416 static bool push_queued_message(struct smb_request
*req
,
417 struct timeval request_time
,
418 struct timeval end_time
,
419 char *private_data
, size_t private_len
)
421 int msg_len
= smb_len(req
->inbuf
) + 4;
422 struct pending_message_list
*msg
;
424 msg
= TALLOC_ZERO_P(NULL
, struct pending_message_list
);
427 DEBUG(0,("push_message: malloc fail (1)\n"));
431 msg
->buf
= data_blob_talloc(msg
, req
->inbuf
, msg_len
);
432 if(msg
->buf
.data
== NULL
) {
433 DEBUG(0,("push_message: malloc fail (2)\n"));
438 msg
->request_time
= request_time
;
439 msg
->end_time
= end_time
;
440 msg
->encrypted
= req
->encrypted
;
443 msg
->private_data
= data_blob_talloc(msg
, private_data
,
445 if (msg
->private_data
.data
== NULL
) {
446 DEBUG(0,("push_message: malloc fail (3)\n"));
452 DLIST_ADD_END(deferred_open_queue
, msg
, struct pending_message_list
*);
454 DEBUG(10,("push_message: pushed message length %u on "
455 "deferred_open_queue\n", (unsigned int)msg_len
));
460 /****************************************************************************
461 Function to delete a sharing violation open message by mid.
462 ****************************************************************************/
464 void remove_deferred_open_smb_message(uint16 mid
)
466 struct pending_message_list
*pml
;
468 for (pml
= deferred_open_queue
; pml
; pml
= pml
->next
) {
469 if (mid
== SVAL(pml
->buf
.data
,smb_mid
)) {
470 DEBUG(10,("remove_sharing_violation_open_smb_message: "
471 "deleting mid %u len %u\n",
473 (unsigned int)pml
->buf
.length
));
474 DLIST_REMOVE(deferred_open_queue
, pml
);
481 /****************************************************************************
482 Move a sharing violation open retry message to the front of the list and
483 schedule it for immediate processing.
484 ****************************************************************************/
486 void schedule_deferred_open_smb_message(uint16 mid
)
488 struct pending_message_list
*pml
;
491 for (pml
= deferred_open_queue
; pml
; pml
= pml
->next
) {
492 uint16 msg_mid
= SVAL(pml
->buf
.data
,smb_mid
);
493 DEBUG(10,("schedule_deferred_open_smb_message: [%d] msg_mid = %u\n", i
++,
494 (unsigned int)msg_mid
));
495 if (mid
== msg_mid
) {
496 DEBUG(10,("schedule_deferred_open_smb_message: scheduling mid %u\n",
498 pml
->end_time
.tv_sec
= 0;
499 pml
->end_time
.tv_usec
= 0;
500 DLIST_PROMOTE(deferred_open_queue
, pml
);
505 DEBUG(10,("schedule_deferred_open_smb_message: failed to find message mid %u\n",
509 /****************************************************************************
510 Return true if this mid is on the deferred queue.
511 ****************************************************************************/
513 bool open_was_deferred(uint16 mid
)
515 struct pending_message_list
*pml
;
517 for (pml
= deferred_open_queue
; pml
; pml
= pml
->next
) {
518 if (SVAL(pml
->buf
.data
,smb_mid
) == mid
) {
525 /****************************************************************************
526 Return the message queued by this mid.
527 ****************************************************************************/
529 struct pending_message_list
*get_open_deferred_message(uint16 mid
)
531 struct pending_message_list
*pml
;
533 for (pml
= deferred_open_queue
; pml
; pml
= pml
->next
) {
534 if (SVAL(pml
->buf
.data
,smb_mid
) == mid
) {
541 /****************************************************************************
542 Function to push a deferred open smb message onto a linked list of local smb
543 messages ready for processing.
544 ****************************************************************************/
546 bool push_deferred_smb_message(struct smb_request
*req
,
547 struct timeval request_time
,
548 struct timeval timeout
,
549 char *private_data
, size_t priv_len
)
551 struct timeval end_time
;
553 if (req
->unread_bytes
) {
554 DEBUG(0,("push_deferred_smb_message: logic error ! "
555 "unread_bytes = %u\n",
556 (unsigned int)req
->unread_bytes
));
557 smb_panic("push_deferred_smb_message: "
558 "logic error unread_bytes != 0" );
561 end_time
= timeval_sum(&request_time
, &timeout
);
563 DEBUG(10,("push_deferred_open_smb_message: pushing message len %u mid %u "
564 "timeout time [%u.%06u]\n",
565 (unsigned int) smb_len(req
->inbuf
)+4, (unsigned int)req
->mid
,
566 (unsigned int)end_time
.tv_sec
,
567 (unsigned int)end_time
.tv_usec
));
569 return push_queued_message(req
, request_time
, end_time
,
570 private_data
, priv_len
);
574 struct timed_event
*te
;
575 struct timeval interval
;
577 bool (*handler
)(const struct timeval
*now
, void *private_data
);
581 static void idle_event_handler(struct event_context
*ctx
,
582 struct timed_event
*te
,
583 const struct timeval
*now
,
586 struct idle_event
*event
=
587 talloc_get_type_abort(private_data
, struct idle_event
);
589 TALLOC_FREE(event
->te
);
591 if (!event
->handler(now
, event
->private_data
)) {
592 /* Don't repeat, delete ourselves */
597 event
->te
= event_add_timed(ctx
, event
,
598 timeval_sum(now
, &event
->interval
),
600 idle_event_handler
, event
);
602 /* We can't do much but fail here. */
603 SMB_ASSERT(event
->te
!= NULL
);
606 struct idle_event
*event_add_idle(struct event_context
*event_ctx
,
608 struct timeval interval
,
610 bool (*handler
)(const struct timeval
*now
,
614 struct idle_event
*result
;
615 struct timeval now
= timeval_current();
617 result
= TALLOC_P(mem_ctx
, struct idle_event
);
618 if (result
== NULL
) {
619 DEBUG(0, ("talloc failed\n"));
623 result
->interval
= interval
;
624 result
->handler
= handler
;
625 result
->private_data
= private_data
;
627 if (!(result
->name
= talloc_asprintf(result
, "idle_evt(%s)", name
))) {
628 DEBUG(0, ("talloc failed\n"));
633 result
->te
= event_add_timed(event_ctx
, result
,
634 timeval_sum(&now
, &interval
),
636 idle_event_handler
, result
);
637 if (result
->te
== NULL
) {
638 DEBUG(0, ("event_add_timed failed\n"));
646 /****************************************************************************
647 Do all async processing in here. This includes kernel oplock messages, change
649 ****************************************************************************/
651 static void async_processing(fd_set
*pfds
)
653 DEBUG(10,("async_processing: Doing async processing.\n"));
657 process_kernel_oplocks(smbd_messaging_context(), pfds
);
659 /* Do the aio check again after receive_local_message as it does a
660 select and may have eaten our signal. */
661 /* Is this till true? -- vl */
665 exit_server_cleanly("termination signal");
668 /* check for sighup processing */
669 if (reload_after_sighup
) {
670 change_to_root_user();
671 DEBUG(1,("Reloading services after SIGHUP\n"));
672 reload_services(False
);
673 reload_after_sighup
= 0;
677 /****************************************************************************
678 Add a fd to the set we will be select(2)ing on.
679 ****************************************************************************/
681 static int select_on_fd(int fd
, int maxfd
, fd_set
*fds
)
685 maxfd
= MAX(maxfd
, fd
);
691 /****************************************************************************
692 Do a select on an two fd's - with timeout.
694 If a local udp message has been pushed onto the
695 queue (this can only happen during oplock break
696 processing) call async_processing()
698 If a pending smb message has been pushed onto the
699 queue (this can only happen during oplock break
700 processing) return this next.
702 If the first smbfd is ready then read an smb from it.
703 if the second (loopback UDP) fd is ready then read a message
704 from it and setup the buffer header to identify the length
706 Returns False on timeout or error.
709 The timeout is in milliseconds
710 ****************************************************************************/
712 static NTSTATUS
receive_message_or_smb(TALLOC_CTX
*mem_ctx
, char **buffer
,
714 size_t *p_unread
, bool *p_encrypted
)
727 to
.tv_sec
= SMBD_SELECT_TIMEOUT
;
731 * Note that this call must be before processing any SMB
732 * messages as we need to synchronously process any messages
733 * we may have sent to ourselves from the previous SMB.
735 message_dispatch(smbd_messaging_context());
738 * Check to see if we already have a message on the deferred open queue
739 * and it's time to schedule.
741 if(deferred_open_queue
!= NULL
) {
742 bool pop_message
= False
;
743 struct pending_message_list
*msg
= deferred_open_queue
;
745 if (timeval_is_zero(&msg
->end_time
)) {
752 tdif
= usec_time_diff(&msg
->end_time
, &tv
);
754 /* Timed out. Schedule...*/
756 DEBUG(10,("receive_message_or_smb: queued message timed out.\n"));
758 /* Make a more accurate select timeout. */
759 to
.tv_sec
= tdif
/ 1000000;
760 to
.tv_usec
= tdif
% 1000000;
761 DEBUG(10,("receive_message_or_smb: select with timeout of [%u.%06u]\n",
762 (unsigned int)to
.tv_sec
, (unsigned int)to
.tv_usec
));
768 *buffer
= (char *)talloc_memdup(mem_ctx
, msg
->buf
.data
,
770 if (*buffer
== NULL
) {
771 DEBUG(0, ("talloc failed\n"));
772 return NT_STATUS_NO_MEMORY
;
774 *buffer_len
= msg
->buf
.length
;
775 *p_encrypted
= msg
->encrypted
;
777 /* We leave this message on the queue so the open code can
778 know this is a retry. */
779 DEBUG(5,("receive_message_or_smb: returning deferred open smb message.\n"));
785 * Setup the select fd sets.
792 * Ensure we process oplock break messages by preference.
793 * We have to do this before the select, after the select
794 * and if the select returns EINTR. This is due to the fact
795 * that the selects called from async_processing can eat an EINTR
796 * caused by a signal (we can't take the break message there).
797 * This is hideously complex - *MUST* be simplified for 3.0 ! JRA.
800 if (oplock_message_waiting(&r_fds
)) {
801 DEBUG(10,("receive_message_or_smb: oplock_message is waiting.\n"));
802 async_processing(&r_fds
);
804 * After async processing we must go and do the select again, as
805 * the state of the flag in fds for the server file descriptor is
806 * indeterminate - we may have done I/O on it in the oplock processing. JRA.
812 * Are there any timed events waiting ? If so, ensure we don't
813 * select for longer than it would take to wait for them.
820 event_add_to_select_args(smbd_event_context(), &now
,
821 &r_fds
, &w_fds
, &to
, &maxfd
);
824 if (timeval_is_zero(&to
)) {
825 /* Process a timed event now... */
826 if (run_events(smbd_event_context(), 0, NULL
, NULL
)) {
833 START_PROFILE(smbd_idle
);
835 maxfd
= select_on_fd(smbd_server_fd(), maxfd
, &r_fds
);
836 maxfd
= select_on_fd(oplock_notify_fd(), maxfd
, &r_fds
);
838 selrtn
= sys_select(maxfd
+1,&r_fds
,&w_fds
,NULL
,&to
);
841 END_PROFILE(smbd_idle
);
845 if (run_events(smbd_event_context(), selrtn
, &r_fds
, &w_fds
)) {
849 /* if we get EINTR then maybe we have received an oplock
850 signal - treat this as select returning 1. This is ugly, but
851 is the best we can do until the oplock code knows more about
853 if (selrtn
== -1 && errno
== EINTR
) {
854 async_processing(&r_fds
);
856 * After async processing we must go and do the select again, as
857 * the state of the flag in fds for the server file descriptor is
858 * indeterminate - we may have done I/O on it in the oplock processing. JRA.
865 /* something is wrong. Maybe the socket is dead? */
866 return map_nt_error_from_unix(errno
);
869 /* Did we timeout ? */
875 * Ensure we process oplock break messages by preference.
876 * This is IMPORTANT ! Otherwise we can starve other processes
877 * sending us an oplock break message. JRA.
880 if (oplock_message_waiting(&r_fds
)) {
881 async_processing(&r_fds
);
883 * After async processing we must go and do the select again, as
884 * the state of the flag in fds for the server file descriptor is
885 * indeterminate - we may have done I/O on it in the oplock processing. JRA.
891 * We've just woken up from a protentially long select sleep.
892 * Ensure we process local messages as we need to synchronously
893 * process any messages from other smbd's to avoid file rename race
894 * conditions. This call is cheap if there are no messages waiting.
897 message_dispatch(smbd_messaging_context());
899 status
= receive_smb_talloc(mem_ctx
, smbd_server_fd(), buffer
, 0,
900 p_unread
, p_encrypted
, &len
);
902 if (!NT_STATUS_IS_OK(status
)) {
912 * Only allow 5 outstanding trans requests. We're allocating memory, so
916 NTSTATUS
allow_new_trans(struct trans_state
*list
, int mid
)
919 for (; list
!= NULL
; list
= list
->next
) {
921 if (list
->mid
== mid
) {
922 return NT_STATUS_INVALID_PARAMETER
;
928 return NT_STATUS_INSUFFICIENT_RESOURCES
;
934 /****************************************************************************
935 We're terminating and have closed all our files/connections etc.
936 If there are any pending local messages we need to respond to them
937 before termination so that other smbds don't think we just died whilst
939 ****************************************************************************/
941 void respond_to_all_remaining_local_messages(void)
944 * Assert we have no exclusive open oplocks.
947 if(get_number_of_exclusive_open_oplocks()) {
948 DEBUG(0,("respond_to_all_remaining_local_messages: PANIC : we have %d exclusive oplocks.\n",
949 get_number_of_exclusive_open_oplocks() ));
953 process_kernel_oplocks(smbd_messaging_context(), NULL
);
960 These flags determine some of the permissions required to do an operation
962 Note that I don't set NEED_WRITE on some write operations because they
963 are used by some brain-dead clients when printing, and I don't want to
964 force write permissions on print services.
966 #define AS_USER (1<<0)
967 #define NEED_WRITE (1<<1) /* Must be paired with AS_USER */
968 #define TIME_INIT (1<<2)
969 #define CAN_IPC (1<<3) /* Must be paired with AS_USER */
970 #define AS_GUEST (1<<5) /* Must *NOT* be paired with AS_USER */
971 #define DO_CHDIR (1<<6)
974 define a list of possible SMB messages and their corresponding
975 functions. Any message that has a NULL function is unimplemented -
976 please feel free to contribute implementations!
978 static const struct smb_message_struct
{
980 void (*fn
)(struct smb_request
*req
);
982 } smb_messages
[256] = {
984 /* 0x00 */ { "SMBmkdir",reply_mkdir
,AS_USER
| NEED_WRITE
},
985 /* 0x01 */ { "SMBrmdir",reply_rmdir
,AS_USER
| NEED_WRITE
},
986 /* 0x02 */ { "SMBopen",reply_open
,AS_USER
},
987 /* 0x03 */ { "SMBcreate",reply_mknew
,AS_USER
},
988 /* 0x04 */ { "SMBclose",reply_close
,AS_USER
| CAN_IPC
},
989 /* 0x05 */ { "SMBflush",reply_flush
,AS_USER
},
990 /* 0x06 */ { "SMBunlink",reply_unlink
,AS_USER
| NEED_WRITE
},
991 /* 0x07 */ { "SMBmv",reply_mv
,AS_USER
| NEED_WRITE
},
992 /* 0x08 */ { "SMBgetatr",reply_getatr
,AS_USER
},
993 /* 0x09 */ { "SMBsetatr",reply_setatr
,AS_USER
| NEED_WRITE
},
994 /* 0x0a */ { "SMBread",reply_read
,AS_USER
},
995 /* 0x0b */ { "SMBwrite",reply_write
,AS_USER
| CAN_IPC
},
996 /* 0x0c */ { "SMBlock",reply_lock
,AS_USER
},
997 /* 0x0d */ { "SMBunlock",reply_unlock
,AS_USER
},
998 /* 0x0e */ { "SMBctemp",reply_ctemp
,AS_USER
},
999 /* 0x0f */ { "SMBmknew",reply_mknew
,AS_USER
},
1000 /* 0x10 */ { "SMBcheckpath",reply_checkpath
,AS_USER
},
1001 /* 0x11 */ { "SMBexit",reply_exit
,DO_CHDIR
},
1002 /* 0x12 */ { "SMBlseek",reply_lseek
,AS_USER
},
1003 /* 0x13 */ { "SMBlockread",reply_lockread
,AS_USER
},
1004 /* 0x14 */ { "SMBwriteunlock",reply_writeunlock
,AS_USER
},
1005 /* 0x15 */ { NULL
, NULL
, 0 },
1006 /* 0x16 */ { NULL
, NULL
, 0 },
1007 /* 0x17 */ { NULL
, NULL
, 0 },
1008 /* 0x18 */ { NULL
, NULL
, 0 },
1009 /* 0x19 */ { NULL
, NULL
, 0 },
1010 /* 0x1a */ { "SMBreadbraw",reply_readbraw
,AS_USER
},
1011 /* 0x1b */ { "SMBreadBmpx",reply_readbmpx
,AS_USER
},
1012 /* 0x1c */ { "SMBreadBs",reply_readbs
,AS_USER
},
1013 /* 0x1d */ { "SMBwritebraw",reply_writebraw
,AS_USER
},
1014 /* 0x1e */ { "SMBwriteBmpx",reply_writebmpx
,AS_USER
},
1015 /* 0x1f */ { "SMBwriteBs",reply_writebs
,AS_USER
},
1016 /* 0x20 */ { "SMBwritec", NULL
,0},
1017 /* 0x21 */ { NULL
, NULL
, 0 },
1018 /* 0x22 */ { "SMBsetattrE",reply_setattrE
,AS_USER
| NEED_WRITE
},
1019 /* 0x23 */ { "SMBgetattrE",reply_getattrE
,AS_USER
},
1020 /* 0x24 */ { "SMBlockingX",reply_lockingX
,AS_USER
},
1021 /* 0x25 */ { "SMBtrans",reply_trans
,AS_USER
| CAN_IPC
},
1022 /* 0x26 */ { "SMBtranss",reply_transs
,AS_USER
| CAN_IPC
},
1023 /* 0x27 */ { "SMBioctl",reply_ioctl
,0},
1024 /* 0x28 */ { "SMBioctls", NULL
,AS_USER
},
1025 /* 0x29 */ { "SMBcopy",reply_copy
,AS_USER
| NEED_WRITE
},
1026 /* 0x2a */ { "SMBmove", NULL
,AS_USER
| NEED_WRITE
},
1027 /* 0x2b */ { "SMBecho",reply_echo
,0},
1028 /* 0x2c */ { "SMBwriteclose",reply_writeclose
,AS_USER
},
1029 /* 0x2d */ { "SMBopenX",reply_open_and_X
,AS_USER
| CAN_IPC
},
1030 /* 0x2e */ { "SMBreadX",reply_read_and_X
,AS_USER
| CAN_IPC
},
1031 /* 0x2f */ { "SMBwriteX",reply_write_and_X
,AS_USER
| CAN_IPC
},
1032 /* 0x30 */ { NULL
, NULL
, 0 },
1033 /* 0x31 */ { NULL
, NULL
, 0 },
1034 /* 0x32 */ { "SMBtrans2",reply_trans2
, AS_USER
| CAN_IPC
},
1035 /* 0x33 */ { "SMBtranss2",reply_transs2
, AS_USER
},
1036 /* 0x34 */ { "SMBfindclose",reply_findclose
,AS_USER
},
1037 /* 0x35 */ { "SMBfindnclose",reply_findnclose
,AS_USER
},
1038 /* 0x36 */ { NULL
, NULL
, 0 },
1039 /* 0x37 */ { NULL
, NULL
, 0 },
1040 /* 0x38 */ { NULL
, NULL
, 0 },
1041 /* 0x39 */ { NULL
, NULL
, 0 },
1042 /* 0x3a */ { NULL
, NULL
, 0 },
1043 /* 0x3b */ { NULL
, NULL
, 0 },
1044 /* 0x3c */ { NULL
, NULL
, 0 },
1045 /* 0x3d */ { NULL
, NULL
, 0 },
1046 /* 0x3e */ { NULL
, NULL
, 0 },
1047 /* 0x3f */ { NULL
, NULL
, 0 },
1048 /* 0x40 */ { NULL
, NULL
, 0 },
1049 /* 0x41 */ { NULL
, NULL
, 0 },
1050 /* 0x42 */ { NULL
, NULL
, 0 },
1051 /* 0x43 */ { NULL
, NULL
, 0 },
1052 /* 0x44 */ { NULL
, NULL
, 0 },
1053 /* 0x45 */ { NULL
, NULL
, 0 },
1054 /* 0x46 */ { NULL
, NULL
, 0 },
1055 /* 0x47 */ { NULL
, NULL
, 0 },
1056 /* 0x48 */ { NULL
, NULL
, 0 },
1057 /* 0x49 */ { NULL
, NULL
, 0 },
1058 /* 0x4a */ { NULL
, NULL
, 0 },
1059 /* 0x4b */ { NULL
, NULL
, 0 },
1060 /* 0x4c */ { NULL
, NULL
, 0 },
1061 /* 0x4d */ { NULL
, NULL
, 0 },
1062 /* 0x4e */ { NULL
, NULL
, 0 },
1063 /* 0x4f */ { NULL
, NULL
, 0 },
1064 /* 0x50 */ { NULL
, NULL
, 0 },
1065 /* 0x51 */ { NULL
, NULL
, 0 },
1066 /* 0x52 */ { NULL
, NULL
, 0 },
1067 /* 0x53 */ { NULL
, NULL
, 0 },
1068 /* 0x54 */ { NULL
, NULL
, 0 },
1069 /* 0x55 */ { NULL
, NULL
, 0 },
1070 /* 0x56 */ { NULL
, NULL
, 0 },
1071 /* 0x57 */ { NULL
, NULL
, 0 },
1072 /* 0x58 */ { NULL
, NULL
, 0 },
1073 /* 0x59 */ { NULL
, NULL
, 0 },
1074 /* 0x5a */ { NULL
, NULL
, 0 },
1075 /* 0x5b */ { NULL
, NULL
, 0 },
1076 /* 0x5c */ { NULL
, NULL
, 0 },
1077 /* 0x5d */ { NULL
, NULL
, 0 },
1078 /* 0x5e */ { NULL
, NULL
, 0 },
1079 /* 0x5f */ { NULL
, NULL
, 0 },
1080 /* 0x60 */ { NULL
, NULL
, 0 },
1081 /* 0x61 */ { NULL
, NULL
, 0 },
1082 /* 0x62 */ { NULL
, NULL
, 0 },
1083 /* 0x63 */ { NULL
, NULL
, 0 },
1084 /* 0x64 */ { NULL
, NULL
, 0 },
1085 /* 0x65 */ { NULL
, NULL
, 0 },
1086 /* 0x66 */ { NULL
, NULL
, 0 },
1087 /* 0x67 */ { NULL
, NULL
, 0 },
1088 /* 0x68 */ { NULL
, NULL
, 0 },
1089 /* 0x69 */ { NULL
, NULL
, 0 },
1090 /* 0x6a */ { NULL
, NULL
, 0 },
1091 /* 0x6b */ { NULL
, NULL
, 0 },
1092 /* 0x6c */ { NULL
, NULL
, 0 },
1093 /* 0x6d */ { NULL
, NULL
, 0 },
1094 /* 0x6e */ { NULL
, NULL
, 0 },
1095 /* 0x6f */ { NULL
, NULL
, 0 },
1096 /* 0x70 */ { "SMBtcon",reply_tcon
,0},
1097 /* 0x71 */ { "SMBtdis",reply_tdis
,DO_CHDIR
},
1098 /* 0x72 */ { "SMBnegprot",reply_negprot
,0},
1099 /* 0x73 */ { "SMBsesssetupX",reply_sesssetup_and_X
,0},
1100 /* 0x74 */ { "SMBulogoffX",reply_ulogoffX
, 0}, /* ulogoff doesn't give a valid TID */
1101 /* 0x75 */ { "SMBtconX",reply_tcon_and_X
,0},
1102 /* 0x76 */ { NULL
, NULL
, 0 },
1103 /* 0x77 */ { NULL
, NULL
, 0 },
1104 /* 0x78 */ { NULL
, NULL
, 0 },
1105 /* 0x79 */ { NULL
, NULL
, 0 },
1106 /* 0x7a */ { NULL
, NULL
, 0 },
1107 /* 0x7b */ { NULL
, NULL
, 0 },
1108 /* 0x7c */ { NULL
, NULL
, 0 },
1109 /* 0x7d */ { NULL
, NULL
, 0 },
1110 /* 0x7e */ { NULL
, NULL
, 0 },
1111 /* 0x7f */ { NULL
, NULL
, 0 },
1112 /* 0x80 */ { "SMBdskattr",reply_dskattr
,AS_USER
},
1113 /* 0x81 */ { "SMBsearch",reply_search
,AS_USER
},
1114 /* 0x82 */ { "SMBffirst",reply_search
,AS_USER
},
1115 /* 0x83 */ { "SMBfunique",reply_search
,AS_USER
},
1116 /* 0x84 */ { "SMBfclose",reply_fclose
,AS_USER
},
1117 /* 0x85 */ { NULL
, NULL
, 0 },
1118 /* 0x86 */ { NULL
, NULL
, 0 },
1119 /* 0x87 */ { NULL
, NULL
, 0 },
1120 /* 0x88 */ { NULL
, NULL
, 0 },
1121 /* 0x89 */ { NULL
, NULL
, 0 },
1122 /* 0x8a */ { NULL
, NULL
, 0 },
1123 /* 0x8b */ { NULL
, NULL
, 0 },
1124 /* 0x8c */ { NULL
, NULL
, 0 },
1125 /* 0x8d */ { NULL
, NULL
, 0 },
1126 /* 0x8e */ { NULL
, NULL
, 0 },
1127 /* 0x8f */ { NULL
, NULL
, 0 },
1128 /* 0x90 */ { NULL
, NULL
, 0 },
1129 /* 0x91 */ { NULL
, NULL
, 0 },
1130 /* 0x92 */ { NULL
, NULL
, 0 },
1131 /* 0x93 */ { NULL
, NULL
, 0 },
1132 /* 0x94 */ { NULL
, NULL
, 0 },
1133 /* 0x95 */ { NULL
, NULL
, 0 },
1134 /* 0x96 */ { NULL
, NULL
, 0 },
1135 /* 0x97 */ { NULL
, NULL
, 0 },
1136 /* 0x98 */ { NULL
, NULL
, 0 },
1137 /* 0x99 */ { NULL
, NULL
, 0 },
1138 /* 0x9a */ { NULL
, NULL
, 0 },
1139 /* 0x9b */ { NULL
, NULL
, 0 },
1140 /* 0x9c */ { NULL
, NULL
, 0 },
1141 /* 0x9d */ { NULL
, NULL
, 0 },
1142 /* 0x9e */ { NULL
, NULL
, 0 },
1143 /* 0x9f */ { NULL
, NULL
, 0 },
1144 /* 0xa0 */ { "SMBnttrans",reply_nttrans
, AS_USER
| CAN_IPC
},
1145 /* 0xa1 */ { "SMBnttranss",reply_nttranss
, AS_USER
| CAN_IPC
},
1146 /* 0xa2 */ { "SMBntcreateX",reply_ntcreate_and_X
, AS_USER
| CAN_IPC
},
1147 /* 0xa3 */ { NULL
, NULL
, 0 },
1148 /* 0xa4 */ { "SMBntcancel",reply_ntcancel
, 0 },
1149 /* 0xa5 */ { "SMBntrename",reply_ntrename
, AS_USER
| NEED_WRITE
},
1150 /* 0xa6 */ { NULL
, NULL
, 0 },
1151 /* 0xa7 */ { NULL
, NULL
, 0 },
1152 /* 0xa8 */ { NULL
, NULL
, 0 },
1153 /* 0xa9 */ { NULL
, NULL
, 0 },
1154 /* 0xaa */ { NULL
, NULL
, 0 },
1155 /* 0xab */ { NULL
, NULL
, 0 },
1156 /* 0xac */ { NULL
, NULL
, 0 },
1157 /* 0xad */ { NULL
, NULL
, 0 },
1158 /* 0xae */ { NULL
, NULL
, 0 },
1159 /* 0xaf */ { NULL
, NULL
, 0 },
1160 /* 0xb0 */ { NULL
, NULL
, 0 },
1161 /* 0xb1 */ { NULL
, NULL
, 0 },
1162 /* 0xb2 */ { NULL
, NULL
, 0 },
1163 /* 0xb3 */ { NULL
, NULL
, 0 },
1164 /* 0xb4 */ { NULL
, NULL
, 0 },
1165 /* 0xb5 */ { NULL
, NULL
, 0 },
1166 /* 0xb6 */ { NULL
, NULL
, 0 },
1167 /* 0xb7 */ { NULL
, NULL
, 0 },
1168 /* 0xb8 */ { NULL
, NULL
, 0 },
1169 /* 0xb9 */ { NULL
, NULL
, 0 },
1170 /* 0xba */ { NULL
, NULL
, 0 },
1171 /* 0xbb */ { NULL
, NULL
, 0 },
1172 /* 0xbc */ { NULL
, NULL
, 0 },
1173 /* 0xbd */ { NULL
, NULL
, 0 },
1174 /* 0xbe */ { NULL
, NULL
, 0 },
1175 /* 0xbf */ { NULL
, NULL
, 0 },
1176 /* 0xc0 */ { "SMBsplopen",reply_printopen
,AS_USER
},
1177 /* 0xc1 */ { "SMBsplwr",reply_printwrite
,AS_USER
},
1178 /* 0xc2 */ { "SMBsplclose",reply_printclose
,AS_USER
},
1179 /* 0xc3 */ { "SMBsplretq",reply_printqueue
,AS_USER
},
1180 /* 0xc4 */ { NULL
, NULL
, 0 },
1181 /* 0xc5 */ { NULL
, NULL
, 0 },
1182 /* 0xc6 */ { NULL
, NULL
, 0 },
1183 /* 0xc7 */ { NULL
, NULL
, 0 },
1184 /* 0xc8 */ { NULL
, NULL
, 0 },
1185 /* 0xc9 */ { NULL
, NULL
, 0 },
1186 /* 0xca */ { NULL
, NULL
, 0 },
1187 /* 0xcb */ { NULL
, NULL
, 0 },
1188 /* 0xcc */ { NULL
, NULL
, 0 },
1189 /* 0xcd */ { NULL
, NULL
, 0 },
1190 /* 0xce */ { NULL
, NULL
, 0 },
1191 /* 0xcf */ { NULL
, NULL
, 0 },
1192 /* 0xd0 */ { "SMBsends",reply_sends
,AS_GUEST
},
1193 /* 0xd1 */ { "SMBsendb", NULL
,AS_GUEST
},
1194 /* 0xd2 */ { "SMBfwdname", NULL
,AS_GUEST
},
1195 /* 0xd3 */ { "SMBcancelf", NULL
,AS_GUEST
},
1196 /* 0xd4 */ { "SMBgetmac", NULL
,AS_GUEST
},
1197 /* 0xd5 */ { "SMBsendstrt",reply_sendstrt
,AS_GUEST
},
1198 /* 0xd6 */ { "SMBsendend",reply_sendend
,AS_GUEST
},
1199 /* 0xd7 */ { "SMBsendtxt",reply_sendtxt
,AS_GUEST
},
1200 /* 0xd8 */ { NULL
, NULL
, 0 },
1201 /* 0xd9 */ { NULL
, NULL
, 0 },
1202 /* 0xda */ { NULL
, NULL
, 0 },
1203 /* 0xdb */ { NULL
, NULL
, 0 },
1204 /* 0xdc */ { NULL
, NULL
, 0 },
1205 /* 0xdd */ { NULL
, NULL
, 0 },
1206 /* 0xde */ { NULL
, NULL
, 0 },
1207 /* 0xdf */ { NULL
, NULL
, 0 },
1208 /* 0xe0 */ { NULL
, NULL
, 0 },
1209 /* 0xe1 */ { NULL
, NULL
, 0 },
1210 /* 0xe2 */ { NULL
, NULL
, 0 },
1211 /* 0xe3 */ { NULL
, NULL
, 0 },
1212 /* 0xe4 */ { NULL
, NULL
, 0 },
1213 /* 0xe5 */ { NULL
, NULL
, 0 },
1214 /* 0xe6 */ { NULL
, NULL
, 0 },
1215 /* 0xe7 */ { NULL
, NULL
, 0 },
1216 /* 0xe8 */ { NULL
, NULL
, 0 },
1217 /* 0xe9 */ { NULL
, NULL
, 0 },
1218 /* 0xea */ { NULL
, NULL
, 0 },
1219 /* 0xeb */ { NULL
, NULL
, 0 },
1220 /* 0xec */ { NULL
, NULL
, 0 },
1221 /* 0xed */ { NULL
, NULL
, 0 },
1222 /* 0xee */ { NULL
, NULL
, 0 },
1223 /* 0xef */ { NULL
, NULL
, 0 },
1224 /* 0xf0 */ { NULL
, NULL
, 0 },
1225 /* 0xf1 */ { NULL
, NULL
, 0 },
1226 /* 0xf2 */ { NULL
, NULL
, 0 },
1227 /* 0xf3 */ { NULL
, NULL
, 0 },
1228 /* 0xf4 */ { NULL
, NULL
, 0 },
1229 /* 0xf5 */ { NULL
, NULL
, 0 },
1230 /* 0xf6 */ { NULL
, NULL
, 0 },
1231 /* 0xf7 */ { NULL
, NULL
, 0 },
1232 /* 0xf8 */ { NULL
, NULL
, 0 },
1233 /* 0xf9 */ { NULL
, NULL
, 0 },
1234 /* 0xfa */ { NULL
, NULL
, 0 },
1235 /* 0xfb */ { NULL
, NULL
, 0 },
1236 /* 0xfc */ { NULL
, NULL
, 0 },
1237 /* 0xfd */ { NULL
, NULL
, 0 },
1238 /* 0xfe */ { NULL
, NULL
, 0 },
1239 /* 0xff */ { NULL
, NULL
, 0 }
1243 /*******************************************************************
1244 allocate and initialize a reply packet
1245 ********************************************************************/
1247 bool create_outbuf(TALLOC_CTX
*mem_ctx
, const char *inbuf
, char **outbuf
,
1248 uint8_t num_words
, uint32_t num_bytes
)
1251 * Protect against integer wrap
1253 if ((num_bytes
> 0xffffff)
1254 || ((num_bytes
+ smb_size
+ num_words
*2) > 0xffffff)) {
1256 if (asprintf(&msg
, "num_bytes too large: %u",
1257 (unsigned)num_bytes
) == -1) {
1258 msg
= CONST_DISCARD(char *, "num_bytes too large");
1263 *outbuf
= TALLOC_ARRAY(mem_ctx
, char,
1264 smb_size
+ num_words
*2 + num_bytes
);
1265 if (*outbuf
== NULL
) {
1269 construct_reply_common(inbuf
, *outbuf
);
1270 srv_set_message(*outbuf
, num_words
, num_bytes
, false);
1272 * Zero out the word area, the caller has to take care of the bcc area
1275 if (num_words
!= 0) {
1276 memset(*outbuf
+ smb_vwv0
, 0, num_words
*2);
1282 void reply_outbuf(struct smb_request
*req
, uint8 num_words
, uint32 num_bytes
)
1285 if (!create_outbuf(req
, (char *)req
->inbuf
, &outbuf
, num_words
,
1287 smb_panic("could not allocate output buffer\n");
1289 req
->outbuf
= (uint8_t *)outbuf
;
1293 /*******************************************************************
1294 Dump a packet to a file.
1295 ********************************************************************/
1297 static void smb_dump(const char *name
, int type
, const char *data
, ssize_t len
)
1301 if (DEBUGLEVEL
< 50) {
1305 if (len
< 4) len
= smb_len(data
)+4;
1306 for (i
=1;i
<100;i
++) {
1307 if (asprintf(&fname
, "/tmp/%s.%d.%s", name
, i
,
1308 type
? "req" : "resp") == -1) {
1311 fd
= open(fname
, O_WRONLY
|O_CREAT
|O_EXCL
, 0644);
1312 if (fd
!= -1 || errno
!= EEXIST
) break;
1315 ssize_t ret
= write(fd
, data
, len
);
1317 DEBUG(0,("smb_dump: problem: write returned %d\n", (int)ret
));
1319 DEBUG(0,("created %s len %lu\n", fname
, (unsigned long)len
));
1324 /****************************************************************************
1325 Prepare everything for calling the actual request function, and potentially
1326 call the request function via the "new" interface.
1328 Return False if the "legacy" function needs to be called, everything is
1331 Return True if we're done.
1333 I know this API sucks, but it is the one with the least code change I could
1335 ****************************************************************************/
1337 static connection_struct
*switch_message(uint8 type
, struct smb_request
*req
, int size
)
1341 connection_struct
*conn
= NULL
;
1343 static uint16 last_session_tag
= UID_FIELD_INVALID
;
1347 /* Make sure this is an SMB packet. smb_size contains NetBIOS header
1348 * so subtract 4 from it. */
1349 if (!valid_smb_header(req
->inbuf
)
1350 || (size
< (smb_size
- 4))) {
1351 DEBUG(2,("Non-SMB packet of length %d. Terminating server\n",
1352 smb_len(req
->inbuf
)));
1353 exit_server_cleanly("Non-SMB packet");
1356 if (smb_messages
[type
].fn
== NULL
) {
1357 DEBUG(0,("Unknown message type %d!\n",type
));
1358 smb_dump("Unknown", 1, (char *)req
->inbuf
, size
);
1359 reply_unknown_new(req
, type
);
1363 flags
= smb_messages
[type
].flags
;
1365 /* In share mode security we must ignore the vuid. */
1366 session_tag
= (lp_security() == SEC_SHARE
)
1367 ? UID_FIELD_INVALID
: req
->vuid
;
1370 DEBUG(3,("switch message %s (pid %d) conn 0x%lx\n", smb_fn_name(type
),
1371 (int)sys_getpid(), (unsigned long)conn
));
1373 smb_dump(smb_fn_name(type
), 1, (char *)req
->inbuf
, size
);
1375 /* Ensure this value is replaced in the incoming packet. */
1376 SSVAL(req
->inbuf
,smb_uid
,session_tag
);
1379 * Ensure the correct username is in current_user_info. This is a
1380 * really ugly bugfix for problems with multiple session_setup_and_X's
1381 * being done and allowing %U and %G substitutions to work correctly.
1382 * There is a reason this code is done here, don't move it unless you
1383 * know what you're doing... :-).
1387 if (session_tag
!= last_session_tag
) {
1388 user_struct
*vuser
= NULL
;
1390 last_session_tag
= session_tag
;
1391 if(session_tag
!= UID_FIELD_INVALID
) {
1392 vuser
= get_valid_user_struct(session_tag
);
1394 set_current_user_info(
1395 vuser
->server_info
->sanitized_username
,
1396 vuser
->server_info
->unix_name
,
1397 pdb_get_fullname(vuser
->server_info
1399 pdb_get_domain(vuser
->server_info
1405 /* Does this call need to be run as the connected user? */
1406 if (flags
& AS_USER
) {
1408 /* Does this call need a valid tree connection? */
1411 * Amazingly, the error code depends on the command
1414 if (type
== SMBntcreateX
) {
1415 reply_nterror(req
, NT_STATUS_INVALID_HANDLE
);
1417 reply_doserror(req
, ERRSRV
, ERRinvnid
);
1422 if (!change_to_user(conn
,session_tag
)) {
1423 reply_nterror(req
, NT_STATUS_DOS(ERRSRV
, ERRbaduid
));
1424 remove_deferred_open_smb_message(req
->mid
);
1428 /* All NEED_WRITE and CAN_IPC flags must also have AS_USER. */
1430 /* Does it need write permission? */
1431 if ((flags
& NEED_WRITE
) && !CAN_WRITE(conn
)) {
1432 reply_nterror(req
, NT_STATUS_MEDIA_WRITE_PROTECTED
);
1436 /* IPC services are limited */
1437 if (IS_IPC(conn
) && !(flags
& CAN_IPC
)) {
1438 reply_doserror(req
, ERRSRV
,ERRaccess
);
1442 /* This call needs to be run as root */
1443 change_to_root_user();
1446 /* load service specific parameters */
1448 if (req
->encrypted
) {
1449 conn
->encrypted_tid
= true;
1450 /* encrypted required from now on. */
1451 conn
->encrypt_level
= Required
;
1452 } else if (ENCRYPTION_REQUIRED(conn
)) {
1453 uint8 com
= CVAL(req
->inbuf
,smb_com
);
1454 if (com
!= SMBtrans2
&& com
!= SMBtranss2
) {
1455 exit_server_cleanly("encryption required "
1461 if (!set_current_service(conn
,SVAL(req
->inbuf
,smb_flg
),
1462 (flags
& (AS_USER
|DO_CHDIR
)
1464 reply_doserror(req
, ERRSRV
, ERRaccess
);
1467 conn
->num_smb_operations
++;
1470 /* does this protocol need to be run as guest? */
1471 if ((flags
& AS_GUEST
)
1472 && (!change_to_guest() ||
1473 !check_access(smbd_server_fd(), lp_hostsallow(-1),
1474 lp_hostsdeny(-1)))) {
1475 reply_doserror(req
, ERRSRV
, ERRaccess
);
1479 smb_messages
[type
].fn(req
);
1483 /****************************************************************************
1484 Construct a reply to the incoming packet.
1485 ****************************************************************************/
1487 static void construct_reply(char *inbuf
, int size
, size_t unread_bytes
, bool encrypted
)
1489 uint8 type
= CVAL(inbuf
,smb_com
);
1490 connection_struct
*conn
;
1491 struct smb_request
*req
;
1497 if (!(req
= talloc(talloc_tos(), struct smb_request
))) {
1498 smb_panic("could not allocate smb_request");
1500 init_smb_request(req
, (uint8
*)inbuf
, unread_bytes
, encrypted
);
1502 conn
= switch_message(type
, req
, size
);
1504 if (req
->unread_bytes
) {
1505 /* writeX failed. drain socket. */
1506 if (drain_socket(smbd_server_fd(), req
->unread_bytes
) !=
1507 req
->unread_bytes
) {
1508 smb_panic("failed to drain pending bytes");
1510 req
->unread_bytes
= 0;
1513 if (req
->outbuf
== NULL
) {
1517 if (CVAL(req
->outbuf
,0) == 0) {
1518 show_msg((char *)req
->outbuf
);
1521 if (!srv_send_smb(smbd_server_fd(),
1522 (char *)req
->outbuf
,
1523 IS_CONN_ENCRYPTED(conn
)||req
->encrypted
)) {
1524 exit_server_cleanly("construct_reply: srv_send_smb failed.");
1532 /****************************************************************************
1533 Process an smb from the client
1534 ****************************************************************************/
1536 static void process_smb(char *inbuf
, size_t nread
, size_t unread_bytes
, bool encrypted
)
1538 static int trans_num
;
1539 int msg_type
= CVAL(inbuf
,0);
1541 DO_PROFILE_INC(smb_count
);
1543 DEBUG( 6, ( "got message type 0x%x of len 0x%x\n", msg_type
,
1545 DEBUG( 3, ( "Transaction %d of length %d (%u toread)\n", trans_num
,
1547 (unsigned int)unread_bytes
));
1549 if (msg_type
!= 0) {
1551 * NetBIOS session request, keepalive, etc.
1553 reply_special(inbuf
);
1559 construct_reply(inbuf
,nread
,unread_bytes
,encrypted
);
1564 /****************************************************************************
1565 Return a string containing the function name of a SMB command.
1566 ****************************************************************************/
1568 const char *smb_fn_name(int type
)
1570 const char *unknown_name
= "SMBunknown";
1572 if (smb_messages
[type
].name
== NULL
)
1573 return(unknown_name
);
1575 return(smb_messages
[type
].name
);
1578 /****************************************************************************
1579 Helper functions for contruct_reply.
1580 ****************************************************************************/
1582 static uint32 common_flags2
= FLAGS2_LONG_PATH_COMPONENTS
|FLAGS2_32_BIT_ERROR_CODES
;
1584 void add_to_common_flags2(uint32 v
)
1589 void remove_from_common_flags2(uint32 v
)
1591 common_flags2
&= ~v
;
1594 void construct_reply_common(const char *inbuf
, char *outbuf
)
1596 srv_set_message(outbuf
,0,0,false);
1598 SCVAL(outbuf
,smb_com
,CVAL(inbuf
,smb_com
));
1599 SIVAL(outbuf
,smb_rcls
,0);
1600 SCVAL(outbuf
,smb_flg
, FLAG_REPLY
| (CVAL(inbuf
,smb_flg
) & FLAG_CASELESS_PATHNAMES
));
1601 SSVAL(outbuf
,smb_flg2
,
1602 (SVAL(inbuf
,smb_flg2
) & FLAGS2_UNICODE_STRINGS
) |
1604 memset(outbuf
+smb_pidhigh
,'\0',(smb_tid
-smb_pidhigh
));
1606 SSVAL(outbuf
,smb_tid
,SVAL(inbuf
,smb_tid
));
1607 SSVAL(outbuf
,smb_pid
,SVAL(inbuf
,smb_pid
));
1608 SSVAL(outbuf
,smb_uid
,SVAL(inbuf
,smb_uid
));
1609 SSVAL(outbuf
,smb_mid
,SVAL(inbuf
,smb_mid
));
1612 /****************************************************************************
1613 Construct a chained reply and add it to the already made reply
1614 ****************************************************************************/
1616 void chain_reply(struct smb_request
*req
)
1618 static char *orig_inbuf
;
1621 * Dirty little const_discard: We mess with req->inbuf, which is
1622 * declared as const. If maybe at some point this routine gets
1623 * rewritten, this const_discard could go away.
1625 char *inbuf
= CONST_DISCARD(char *, req
->inbuf
);
1626 int size
= smb_len(req
->inbuf
)+4;
1628 int smb_com1
, smb_com2
= CVAL(inbuf
,smb_vwv0
);
1629 unsigned smb_off2
= SVAL(inbuf
,smb_vwv1
);
1633 char inbuf_saved
[smb_wct
];
1634 char *outbuf
= (char *)req
->outbuf
;
1635 size_t outsize
= smb_len(outbuf
) + 4;
1636 size_t outsize_padded
;
1638 size_t ofs
, to_move
;
1640 struct smb_request
*req2
;
1641 size_t caller_outputlen
;
1642 char *caller_output
;
1644 /* Maybe its not chained, or it's an error packet. */
1645 if (smb_com2
== 0xFF || SVAL(outbuf
,smb_rcls
) != 0) {
1646 SCVAL(outbuf
,smb_vwv0
,0xFF);
1650 if (chain_size
== 0) {
1651 /* this is the first part of the chain */
1656 * We need to save the output the caller added to the chain so that we
1657 * can splice it into the final output buffer later.
1660 caller_outputlen
= outsize
- smb_wct
;
1662 caller_output
= (char *)memdup(outbuf
+ smb_wct
, caller_outputlen
);
1664 if (caller_output
== NULL
) {
1665 /* TODO: NT_STATUS_NO_MEMORY */
1666 smb_panic("could not dup outbuf");
1670 * The original Win95 redirector dies on a reply to
1671 * a lockingX and read chain unless the chain reply is
1672 * 4 byte aligned. JRA.
1675 outsize_padded
= (outsize
+ 3) & ~3;
1676 padding
= outsize_padded
- outsize
;
1679 * remember how much the caller added to the chain, only counting
1680 * stuff after the parameter words
1682 chain_size
+= (outsize_padded
- smb_wct
);
1685 * work out pointers into the original packets. The
1686 * headers on these need to be filled in
1688 inbuf2
= orig_inbuf
+ smb_off2
+ 4 - smb_wct
;
1690 /* remember the original command type */
1691 smb_com1
= CVAL(orig_inbuf
,smb_com
);
1693 /* save the data which will be overwritten by the new headers */
1694 memcpy(inbuf_saved
,inbuf2
,smb_wct
);
1696 /* give the new packet the same header as the last part of the SMB */
1697 memmove(inbuf2
,inbuf
,smb_wct
);
1699 /* create the in buffer */
1700 SCVAL(inbuf2
,smb_com
,smb_com2
);
1702 /* work out the new size for the in buffer. */
1703 new_size
= size
- (inbuf2
- inbuf
);
1705 DEBUG(0,("chain_reply: chain packet size incorrect "
1706 "(orig size = %d, offset = %d)\n",
1707 size
, (int)(inbuf2
- inbuf
) ));
1708 exit_server_cleanly("Bad chained packet");
1712 /* And set it in the header. */
1713 smb_setlen(inbuf2
, new_size
- 4);
1715 DEBUG(3,("Chained message\n"));
1718 if (!(req2
= talloc(talloc_tos(), struct smb_request
))) {
1719 smb_panic("could not allocate smb_request");
1721 init_smb_request(req2
, (uint8
*)inbuf2
,0, req
->encrypted
);
1723 /* process the request */
1724 switch_message(smb_com2
, req2
, new_size
);
1727 * We don't accept deferred operations in chained requests.
1729 SMB_ASSERT(req2
->outbuf
!= NULL
);
1730 outsize2
= smb_len(req2
->outbuf
)+4;
1733 * Move away the new command output so that caller_output fits in,
1734 * copy in the caller_output saved above.
1737 SMB_ASSERT(outsize_padded
>= smb_wct
);
1740 * "ofs" is the space we need for caller_output. Equal to
1741 * caller_outputlen plus the padding.
1744 ofs
= outsize_padded
- smb_wct
;
1747 * "to_move" is the amount of bytes the secondary routine gave us
1750 to_move
= outsize2
- smb_wct
;
1752 if (to_move
+ ofs
+ smb_wct
+ chain_size
> max_send
) {
1753 smb_panic("replies too large -- would have to cut");
1757 * In the "new" API "outbuf" is allocated via reply_outbuf, just for
1758 * the first request in the chain. So we have to re-allocate it. In
1759 * the "old" API the only outbuf ever used is the global OutBuffer
1760 * which is always large enough.
1763 outbuf
= TALLOC_REALLOC_ARRAY(NULL
, outbuf
, char,
1764 to_move
+ ofs
+ smb_wct
);
1765 if (outbuf
== NULL
) {
1766 smb_panic("could not realloc outbuf");
1769 req
->outbuf
= (uint8
*)outbuf
;
1771 memmove(outbuf
+ smb_wct
+ ofs
, req2
->outbuf
+ smb_wct
, to_move
);
1772 memcpy(outbuf
+ smb_wct
, caller_output
, caller_outputlen
);
1775 * copy the new reply header over the old one but preserve the smb_com
1778 memmove(outbuf
, req2
->outbuf
, smb_wct
);
1779 SCVAL(outbuf
, smb_com
, smb_com1
);
1782 * We've just copied in the whole "wct" area from the secondary
1783 * function. Fix up the chaining: com2 and the offset need to be
1787 SCVAL(outbuf
, smb_vwv0
, smb_com2
);
1788 SSVAL(outbuf
, smb_vwv1
, chain_size
+ smb_wct
- 4);
1793 * Due to padding we have some uninitialized bytes after the
1797 memset(outbuf
+ outsize
, 0, padding
);
1800 smb_setlen(outbuf
, outsize2
+ caller_outputlen
+ padding
- 4);
1803 * restore the saved data, being careful not to overwrite any data
1804 * from the reply header
1806 memcpy(inbuf2
,inbuf_saved
,smb_wct
);
1808 SAFE_FREE(caller_output
);
1812 * Reset the chain_size for our caller's offset calculations
1815 chain_size
-= (outsize_padded
- smb_wct
);
1820 /****************************************************************************
1821 Check if services need reloading.
1822 ****************************************************************************/
1824 void check_reload(time_t t
)
1826 static pid_t mypid
= 0;
1827 static time_t last_smb_conf_reload_time
= 0;
1828 static time_t last_printer_reload_time
= 0;
1829 time_t printcap_cache_time
= (time_t)lp_printcap_cache_time();
1831 if(last_smb_conf_reload_time
== 0) {
1832 last_smb_conf_reload_time
= t
;
1833 /* Our printing subsystem might not be ready at smbd start up.
1834 Then no printer is available till the first printers check
1835 is performed. A lower initial interval circumvents this. */
1836 if ( printcap_cache_time
> 60 )
1837 last_printer_reload_time
= t
- printcap_cache_time
+ 60;
1839 last_printer_reload_time
= t
;
1842 if (mypid
!= getpid()) { /* First time or fork happened meanwhile */
1843 /* randomize over 60 second the printcap reload to avoid all
1844 * process hitting cupsd at the same time */
1845 int time_range
= 60;
1847 last_printer_reload_time
+= random() % time_range
;
1851 if (reload_after_sighup
|| (t
>= last_smb_conf_reload_time
+SMBD_RELOAD_CHECK
)) {
1852 reload_services(True
);
1853 reload_after_sighup
= False
;
1854 last_smb_conf_reload_time
= t
;
1857 /* 'printcap cache time = 0' disable the feature */
1859 if ( printcap_cache_time
!= 0 )
1861 /* see if it's time to reload or if the clock has been set back */
1863 if ( (t
>= last_printer_reload_time
+printcap_cache_time
)
1864 || (t
-last_printer_reload_time
< 0) )
1866 DEBUG( 3,( "Printcap cache time expired.\n"));
1868 last_printer_reload_time
= t
;
1873 /****************************************************************************
1874 Process commands from the client
1875 ****************************************************************************/
1877 void smbd_process(void)
1879 unsigned int num_smbs
= 0;
1880 size_t unread_bytes
= 0;
1882 char addr
[INET6_ADDRSTRLEN
];
1885 * Before the first packet, check the global hosts allow/ hosts deny
1886 * parameters before doing any parsing of packets passed to us by the
1887 * client. This prevents attacks on our parsing code from hosts not in
1888 * the hosts allow list.
1891 if (!check_access(smbd_server_fd(), lp_hostsallow(-1),
1892 lp_hostsdeny(-1))) {
1894 * send a negative session response "not listening on calling
1897 unsigned char buf
[5] = {0x83, 0, 0, 1, 0x81};
1898 DEBUG( 1, ("Connection denied from %s\n",
1899 client_addr(get_client_fd(),addr
,sizeof(addr
)) ) );
1900 (void)srv_send_smb(smbd_server_fd(),(char *)buf
,false);
1901 exit_server_cleanly("connection denied");
1904 max_recv
= MIN(lp_maxxmit(),BUFFER_SIZE
);
1909 size_t inbuf_len
= 0;
1910 bool encrypted
= false;
1911 TALLOC_CTX
*frame
= talloc_stackframe_pool(8192);
1915 run_events(smbd_event_context(), 0, NULL
, NULL
);
1917 status
= receive_message_or_smb(
1918 talloc_tos(), &inbuf
, &inbuf_len
,
1919 &unread_bytes
, &encrypted
);
1921 if (!NT_STATUS_IS_OK(status
)) {
1922 DEBUG(3, ("receive_message_or_smb failed: %s, "
1923 "exiting\n", nt_errstr(status
)));
1927 process_smb(inbuf
, inbuf_len
, unread_bytes
, encrypted
);
1933 /* The timeout_processing function isn't run nearly
1934 often enough to implement 'max log size' without
1935 overrunning the size of the file by many megabytes.
1936 This is especially true if we are running at debug
1937 level 10. Checking every 50 SMBs is a nice
1938 tradeoff of performance vs log file size overrun. */
1940 if ((num_smbs
% 50) == 0 && need_to_check_log_size()) {
1941 change_to_root_user();