2 Unix SMB/CIFS implementation.
3 process incoming packets - main loop
4 Copyright (C) Andrew Tridgell 1992-1998
5 Copyright (C) Volker Lendecke 2005-2007
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 3 of the License, or
10 (at your option) any later version.
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with this program. If not, see <http://www.gnu.org/licenses/>.
23 extern int smb_echo_count;
25 static enum smb_read_errors smb_read_error = SMB_READ_OK;
28 * Size of data we can send to client. Set
29 * by the client for all protocols above CORE.
30 * Set by us for CORE protocol.
32 int max_send = BUFFER_SIZE;
34 * Size of the data we can receive. Set by us.
35 * Can be modified by the max xmit parameter.
37 int max_recv = BUFFER_SIZE;
39 SIG_ATOMIC_T reload_after_sighup = 0;
40 SIG_ATOMIC_T got_sig_term = 0;
41 extern bool global_machine_password_needs_changing;
44 /* Accessor function for smb_read_error for smbd functions. */
46 enum smb_read_errors *get_srv_read_error(void)
48 return &smb_read_error;
51 /****************************************************************************
53 ****************************************************************************/
55 bool srv_send_smb(int fd, char *buffer, bool do_encrypt)
60 char *buf_out = buffer;
62 /* Sign the outgoing packet if required. */
63 srv_calculate_sign_mac(buf_out);
66 NTSTATUS status = srv_encrypt_buffer(buffer, &buf_out);
67 if (!NT_STATUS_IS_OK(status)) {
68 DEBUG(0, ("send_smb: SMB encryption failed "
69 "on outgoing packet! Error %s\n",
75 len = smb_len(buf_out) + 4;
77 while (nwritten < len) {
78 ret = write_data(fd,buf_out+nwritten,len - nwritten);
80 DEBUG(0,("Error writing %d bytes to client. %d. (%s)\n",
81 (int)len,(int)ret, strerror(errno) ));
82 srv_free_enc_buffer(buf_out);
88 srv_free_enc_buffer(buf_out);
92 /*******************************************************************
93 Setup the word count and byte count for a smb message.
94 ********************************************************************/
96 int srv_set_message(char *buf,
101 if (zero && (num_words || num_bytes)) {
102 memset(buf + smb_size,'\0',num_words*2 + num_bytes);
104 SCVAL(buf,smb_wct,num_words);
105 SSVAL(buf,smb_vwv + num_words*SIZEOFWORD,num_bytes);
106 smb_setlen(buf,(smb_size + num_words*2 + num_bytes - 4));
107 return (smb_size + num_words*2 + num_bytes);
110 static bool valid_smb_header(const uint8_t *inbuf)
112 if (is_encrypted_packet(inbuf)) {
115 return (strncmp(smb_base(inbuf),"\377SMB",4) == 0);
118 /* Socket functions for smbd packet processing. */
120 static bool valid_packet_size(size_t len)
123 * A WRITEX with CAP_LARGE_WRITEX can be 64k worth of data plus 65 bytes
124 * of header. Don't print the error if this fits.... JRA.
127 if (len > (BUFFER_SIZE + LARGE_WRITEX_HDR_SIZE)) {
128 DEBUG(0,("Invalid packet length! (%lu bytes).\n",
129 (unsigned long)len));
130 if (len > BUFFER_SIZE + (SAFETY_MARGIN/2)) {
137 static NTSTATUS read_packet_remainder(int fd, char *buffer,
138 unsigned int timeout, ssize_t len)
144 return read_socket_with_timeout_ntstatus(fd, buffer, len, len,
148 /****************************************************************************
149 Attempt a zerocopy writeX read. We know here that len > smb_size-4
150 ****************************************************************************/
153 * Unfortunately, earlier versions of smbclient/libsmbclient
154 * don't send this "standard" writeX header. I've fixed this
155 * for 3.2 but we'll use the old method with earlier versions.
156 * Windows and CIFSFS at least use this standard size. Not
160 #define STANDARD_WRITE_AND_X_HEADER_SIZE (smb_size - 4 + /* basic header */ \
161 (2*14) + /* word count (including bcc) */ \
164 static NTSTATUS receive_smb_raw_talloc_partial_read(TALLOC_CTX *mem_ctx,
165 const char lenbuf[4],
166 int fd, char **buffer,
167 unsigned int timeout,
171 /* Size of a WRITEX call (+4 byte len). */
172 char writeX_header[4 + STANDARD_WRITE_AND_X_HEADER_SIZE];
173 ssize_t len = smb_len_large(lenbuf); /* Could be a UNIX large writeX. */
177 memcpy(writeX_header, lenbuf, sizeof(lenbuf));
179 status = read_socket_with_timeout_ntstatus(
180 fd, writeX_header + 4,
181 STANDARD_WRITE_AND_X_HEADER_SIZE,
182 STANDARD_WRITE_AND_X_HEADER_SIZE,
185 if (!NT_STATUS_IS_OK(status)) {
190 * Ok - now try and see if this is a possible
194 if (is_valid_writeX_buffer((uint8_t *)writeX_header)) {
196 * If the data offset is beyond what
197 * we've read, drain the extra bytes.
199 uint16_t doff = SVAL(writeX_header,smb_vwv11);
202 if (doff > STANDARD_WRITE_AND_X_HEADER_SIZE) {
203 size_t drain = doff - STANDARD_WRITE_AND_X_HEADER_SIZE;
204 if (drain_socket(smbd_server_fd(), drain) != drain) {
205 smb_panic("receive_smb_raw_talloc_partial_read:"
206 " failed to drain pending bytes");
209 doff = STANDARD_WRITE_AND_X_HEADER_SIZE;
212 /* Spoof down the length and null out the bcc. */
213 set_message_bcc(writeX_header, 0);
214 newlen = smb_len(writeX_header);
216 /* Copy the header we've written. */
218 *buffer = (char *)TALLOC_MEMDUP(mem_ctx,
220 sizeof(writeX_header));
222 if (*buffer == NULL) {
223 DEBUG(0, ("Could not allocate inbuf of length %d\n",
224 (int)sizeof(writeX_header)));
225 return NT_STATUS_NO_MEMORY;
228 /* Work out the remaining bytes. */
229 *p_unread = len - STANDARD_WRITE_AND_X_HEADER_SIZE;
230 *len_ret = newlen + 4;
234 if (!valid_packet_size(len)) {
235 return NT_STATUS_INVALID_PARAMETER;
239 * Not a valid writeX call. Just do the standard
243 *buffer = TALLOC_ARRAY(mem_ctx, char, len+4);
245 if (*buffer == NULL) {
246 DEBUG(0, ("Could not allocate inbuf of length %d\n",
248 return NT_STATUS_NO_MEMORY;
251 /* Copy in what we already read. */
254 4 + STANDARD_WRITE_AND_X_HEADER_SIZE);
255 toread = len - STANDARD_WRITE_AND_X_HEADER_SIZE;
258 status = read_packet_remainder(
259 fd, (*buffer) + 4 + STANDARD_WRITE_AND_X_HEADER_SIZE,
262 if (!NT_STATUS_IS_OK(status)) {
271 static NTSTATUS receive_smb_raw_talloc(TALLOC_CTX *mem_ctx, int fd,
272 char **buffer, unsigned int timeout,
273 size_t *p_unread, size_t *plen)
277 int min_recv_size = lp_min_receive_file_size();
282 status = read_smb_length_return_keepalive(fd, lenbuf, timeout, &len);
283 if (!NT_STATUS_IS_OK(status)) {
284 DEBUG(10, ("receive_smb_raw: %s\n", nt_errstr(status)));
288 if (CVAL(lenbuf,0) == 0 &&
290 smb_len_large(lenbuf) > min_recv_size && /* Could be a UNIX large writeX. */
291 !srv_is_signing_active()) {
293 status = receive_smb_raw_talloc_partial_read(
294 mem_ctx, lenbuf, fd, buffer, timeout, p_unread, &len);
296 if (!NT_STATUS_IS_OK(status)) {
297 DEBUG(10, ("receive_smb_raw: %s\n",
303 if (!valid_packet_size(len)) {
304 return NT_STATUS_INVALID_PARAMETER;
308 * The +4 here can't wrap, we've checked the length above already.
311 *buffer = TALLOC_ARRAY(mem_ctx, char, len+4);
313 if (*buffer == NULL) {
314 DEBUG(0, ("Could not allocate inbuf of length %d\n",
316 return NT_STATUS_NO_MEMORY;
319 memcpy(*buffer, lenbuf, sizeof(lenbuf));
321 status = read_packet_remainder(fd, (*buffer)+4, timeout, len);
322 if (!NT_STATUS_IS_OK(status)) {
330 static ssize_t receive_smb_talloc(TALLOC_CTX *mem_ctx,
333 unsigned int timeout,
340 *p_encrypted = false;
342 set_smb_read_error(get_srv_read_error(), SMB_READ_OK);
344 status = receive_smb_raw_talloc(mem_ctx, fd, buffer, timeout,
346 if (!NT_STATUS_IS_OK(status)) {
347 if (NT_STATUS_EQUAL(status, NT_STATUS_END_OF_FILE)) {
348 set_smb_read_error(get_srv_read_error(), SMB_READ_EOF);
352 if (NT_STATUS_EQUAL(status, NT_STATUS_IO_TIMEOUT)) {
353 set_smb_read_error(get_srv_read_error(),
358 set_smb_read_error(get_srv_read_error(), SMB_READ_ERROR);
362 if (is_encrypted_packet((uint8_t *)*buffer)) {
363 status = srv_decrypt_buffer(*buffer);
364 if (!NT_STATUS_IS_OK(status)) {
365 DEBUG(0, ("receive_smb_talloc: SMB decryption failed on "
366 "incoming packet! Error %s\n",
367 nt_errstr(status) ));
368 cond_set_smb_read_error(get_srv_read_error(),
369 SMB_READ_BAD_DECRYPT);
375 /* Check the incoming SMB signature. */
376 if (!srv_check_sign_mac(*buffer, true)) {
377 DEBUG(0, ("receive_smb: SMB Signature verification failed on "
378 "incoming packet!\n"));
379 cond_set_smb_read_error(get_srv_read_error(),SMB_READ_BAD_SIG);
387 * Initialize a struct smb_request from an inbuf
390 void init_smb_request(struct smb_request *req,
395 size_t req_size = smb_len(inbuf) + 4;
396 /* Ensure we have at least smb_size bytes. */
397 if (req_size < smb_size) {
398 DEBUG(0,("init_smb_request: invalid request size %u\n",
399 (unsigned int)req_size ));
400 exit_server_cleanly("Invalid SMB request");
402 req->flags2 = SVAL(inbuf, smb_flg2);
403 req->smbpid = SVAL(inbuf, smb_pid);
404 req->mid = SVAL(inbuf, smb_mid);
405 req->vuid = SVAL(inbuf, smb_uid);
406 req->tid = SVAL(inbuf, smb_tid);
407 req->wct = CVAL(inbuf, smb_wct);
408 req->unread_bytes = unread_bytes;
409 req->encrypted = encrypted;
410 req->conn = conn_find(req->tid);
412 /* Ensure we have at least wct words and 2 bytes of bcc. */
413 if (smb_size + req->wct*2 > req_size) {
414 DEBUG(0,("init_smb_request: invalid wct number %u (size %u)\n",
415 (unsigned int)req->wct,
416 (unsigned int)req_size));
417 exit_server_cleanly("Invalid SMB request");
419 /* Ensure bcc is correct. */
420 if (((uint8 *)smb_buf(inbuf)) + smb_buflen(inbuf) > inbuf + req_size) {
421 DEBUG(0,("init_smb_request: invalid bcc number %u "
422 "(wct = %u, size %u)\n",
423 (unsigned int)smb_buflen(inbuf),
424 (unsigned int)req->wct,
425 (unsigned int)req_size));
426 exit_server_cleanly("Invalid SMB request");
432 /****************************************************************************
433 structure to hold a linked list of queued messages.
435 ****************************************************************************/
437 static struct pending_message_list *deferred_open_queue;
439 /****************************************************************************
440 Function to push a message onto the tail of a linked list of smb messages ready
442 ****************************************************************************/
444 static bool push_queued_message(struct smb_request *req,
445 struct timeval request_time,
446 struct timeval end_time,
447 char *private_data, size_t private_len)
449 int msg_len = smb_len(req->inbuf) + 4;
450 struct pending_message_list *msg;
452 msg = TALLOC_ZERO_P(NULL, struct pending_message_list);
455 DEBUG(0,("push_message: malloc fail (1)\n"));
459 msg->buf = data_blob_talloc(msg, req->inbuf, msg_len);
460 if(msg->buf.data == NULL) {
461 DEBUG(0,("push_message: malloc fail (2)\n"));
466 msg->request_time = request_time;
467 msg->end_time = end_time;
468 msg->encrypted = req->encrypted;
471 msg->private_data = data_blob_talloc(msg, private_data,
473 if (msg->private_data.data == NULL) {
474 DEBUG(0,("push_message: malloc fail (3)\n"));
480 DLIST_ADD_END(deferred_open_queue, msg, struct pending_message_list *);
482 DEBUG(10,("push_message: pushed message length %u on "
483 "deferred_open_queue\n", (unsigned int)msg_len));
488 /****************************************************************************
489 Function to delete a sharing violation open message by mid.
490 ****************************************************************************/
492 void remove_deferred_open_smb_message(uint16 mid)
494 struct pending_message_list *pml;
496 for (pml = deferred_open_queue; pml; pml = pml->next) {
497 if (mid == SVAL(pml->buf.data,smb_mid)) {
498 DEBUG(10,("remove_sharing_violation_open_smb_message: "
499 "deleting mid %u len %u\n",
501 (unsigned int)pml->buf.length ));
502 DLIST_REMOVE(deferred_open_queue, pml);
509 /****************************************************************************
510 Move a sharing violation open retry message to the front of the list and
511 schedule it for immediate processing.
512 ****************************************************************************/
514 void schedule_deferred_open_smb_message(uint16 mid)
516 struct pending_message_list *pml;
519 for (pml = deferred_open_queue; pml; pml = pml->next) {
520 uint16 msg_mid = SVAL(pml->buf.data,smb_mid);
521 DEBUG(10,("schedule_deferred_open_smb_message: [%d] msg_mid = %u\n", i++,
522 (unsigned int)msg_mid ));
523 if (mid == msg_mid) {
524 DEBUG(10,("schedule_deferred_open_smb_message: scheduling mid %u\n",
526 pml->end_time.tv_sec = 0;
527 pml->end_time.tv_usec = 0;
528 DLIST_PROMOTE(deferred_open_queue, pml);
533 DEBUG(10,("schedule_deferred_open_smb_message: failed to find message mid %u\n",
537 /****************************************************************************
538 Return true if this mid is on the deferred queue.
539 ****************************************************************************/
541 bool open_was_deferred(uint16 mid)
543 struct pending_message_list *pml;
545 for (pml = deferred_open_queue; pml; pml = pml->next) {
546 if (SVAL(pml->buf.data,smb_mid) == mid) {
553 /****************************************************************************
554 Return the message queued by this mid.
555 ****************************************************************************/
557 struct pending_message_list *get_open_deferred_message(uint16 mid)
559 struct pending_message_list *pml;
561 for (pml = deferred_open_queue; pml; pml = pml->next) {
562 if (SVAL(pml->buf.data,smb_mid) == mid) {
569 /****************************************************************************
570 Function to push a deferred open smb message onto a linked list of local smb
571 messages ready for processing.
572 ****************************************************************************/
574 bool push_deferred_smb_message(struct smb_request *req,
575 struct timeval request_time,
576 struct timeval timeout,
577 char *private_data, size_t priv_len)
579 struct timeval end_time;
581 if (req->unread_bytes) {
582 DEBUG(0,("push_deferred_smb_message: logic error ! "
583 "unread_bytes = %u\n",
584 (unsigned int)req->unread_bytes ));
585 smb_panic("push_deferred_smb_message: "
586 "logic error unread_bytes != 0" );
589 end_time = timeval_sum(&request_time, &timeout);
591 DEBUG(10,("push_deferred_open_smb_message: pushing message len %u mid %u "
592 "timeout time [%u.%06u]\n",
593 (unsigned int) smb_len(req->inbuf)+4, (unsigned int)req->mid,
594 (unsigned int)end_time.tv_sec,
595 (unsigned int)end_time.tv_usec));
597 return push_queued_message(req, request_time, end_time,
598 private_data, priv_len);
602 struct timed_event *te;
603 struct timeval interval;
605 bool (*handler)(const struct timeval *now, void *private_data);
609 static void idle_event_handler(struct event_context *ctx,
610 struct timed_event *te,
611 const struct timeval *now,
614 struct idle_event *event =
615 talloc_get_type_abort(private_data, struct idle_event);
617 TALLOC_FREE(event->te);
619 if (!event->handler(now, event->private_data)) {
620 /* Don't repeat, delete ourselves */
625 event->te = event_add_timed(ctx, event,
626 timeval_sum(now, &event->interval),
628 idle_event_handler, event);
630 /* We can't do much but fail here. */
631 SMB_ASSERT(event->te != NULL);
634 struct idle_event *event_add_idle(struct event_context *event_ctx,
636 struct timeval interval,
638 bool (*handler)(const struct timeval *now,
642 struct idle_event *result;
643 struct timeval now = timeval_current();
645 result = TALLOC_P(mem_ctx, struct idle_event);
646 if (result == NULL) {
647 DEBUG(0, ("talloc failed\n"));
651 result->interval = interval;
652 result->handler = handler;
653 result->private_data = private_data;
655 if (!(result->name = talloc_asprintf(result, "idle_evt(%s)", name))) {
656 DEBUG(0, ("talloc failed\n"));
661 result->te = event_add_timed(event_ctx, result,
662 timeval_sum(&now, &interval),
664 idle_event_handler, result);
665 if (result->te == NULL) {
666 DEBUG(0, ("event_add_timed failed\n"));
674 /****************************************************************************
675 Do all async processing in here. This includes kernel oplock messages, change
677 ****************************************************************************/
679 static void async_processing(fd_set *pfds)
681 DEBUG(10,("async_processing: Doing async processing.\n"));
685 process_kernel_oplocks(smbd_messaging_context(), pfds);
687 /* Do the aio check again after receive_local_message as it does a
688 select and may have eaten our signal. */
689 /* Is this till true? -- vl */
693 exit_server_cleanly("termination signal");
696 /* check for sighup processing */
697 if (reload_after_sighup) {
698 change_to_root_user();
699 DEBUG(1,("Reloading services after SIGHUP\n"));
700 reload_services(False);
701 reload_after_sighup = 0;
705 /****************************************************************************
706 Add a fd to the set we will be select(2)ing on.
707 ****************************************************************************/
709 static int select_on_fd(int fd, int maxfd, fd_set *fds)
713 maxfd = MAX(maxfd, fd);
719 /****************************************************************************
720 Do a select on an two fd's - with timeout.
722 If a local udp message has been pushed onto the
723 queue (this can only happen during oplock break
724 processing) call async_processing()
726 If a pending smb message has been pushed onto the
727 queue (this can only happen during oplock break
728 processing) return this next.
730 If the first smbfd is ready then read an smb from it.
731 if the second (loopback UDP) fd is ready then read a message
732 from it and setup the buffer header to identify the length
734 Returns False on timeout or error.
737 The timeout is in milliseconds
738 ****************************************************************************/
740 static bool receive_message_or_smb(TALLOC_CTX *mem_ctx,
754 set_smb_read_error(get_srv_read_error(),SMB_READ_OK);
759 to.tv_sec = timeout / 1000;
760 to.tv_usec = (timeout % 1000) * 1000;
762 to.tv_sec = SMBD_SELECT_TIMEOUT;
767 * Note that this call must be before processing any SMB
768 * messages as we need to synchronously process any messages
769 * we may have sent to ourselves from the previous SMB.
771 message_dispatch(smbd_messaging_context());
774 * Check to see if we already have a message on the deferred open queue
775 * and it's time to schedule.
777 if(deferred_open_queue != NULL) {
778 bool pop_message = False;
779 struct pending_message_list *msg = deferred_open_queue;
781 if (timeval_is_zero(&msg->end_time)) {
788 tdif = usec_time_diff(&msg->end_time, &tv);
790 /* Timed out. Schedule...*/
792 DEBUG(10,("receive_message_or_smb: queued message timed out.\n"));
794 /* Make a more accurate select timeout. */
795 to.tv_sec = tdif / 1000000;
796 to.tv_usec = tdif % 1000000;
797 DEBUG(10,("receive_message_or_smb: select with timeout of [%u.%06u]\n",
798 (unsigned int)to.tv_sec, (unsigned int)to.tv_usec ));
804 *buffer = (char *)talloc_memdup(mem_ctx, msg->buf.data,
806 if (*buffer == NULL) {
807 DEBUG(0, ("talloc failed\n"));
808 set_smb_read_error(get_srv_read_error(),SMB_READ_ERROR);
811 *buffer_len = msg->buf.length;
812 *p_encrypted = msg->encrypted;
814 /* We leave this message on the queue so the open code can
815 know this is a retry. */
816 DEBUG(5,("receive_message_or_smb: returning deferred open smb message.\n"));
822 * Setup the select fd sets.
829 * Ensure we process oplock break messages by preference.
830 * We have to do this before the select, after the select
831 * and if the select returns EINTR. This is due to the fact
832 * that the selects called from async_processing can eat an EINTR
833 * caused by a signal (we can't take the break message there).
834 * This is hideously complex - *MUST* be simplified for 3.0 ! JRA.
837 if (oplock_message_waiting(&r_fds)) {
838 DEBUG(10,("receive_message_or_smb: oplock_message is waiting.\n"));
839 async_processing(&r_fds);
841 * After async processing we must go and do the select again, as
842 * the state of the flag in fds for the server file descriptor is
843 * indeterminate - we may have done I/O on it in the oplock processing. JRA.
849 * Are there any timed events waiting ? If so, ensure we don't
850 * select for longer than it would take to wait for them.
857 event_add_to_select_args(smbd_event_context(), &now,
858 &r_fds, &w_fds, &to, &maxfd);
861 if (timeval_is_zero(&to)) {
862 /* Process a timed event now... */
863 if (run_events(smbd_event_context(), 0, NULL, NULL)) {
870 START_PROFILE(smbd_idle);
872 maxfd = select_on_fd(smbd_server_fd(), maxfd, &r_fds);
873 maxfd = select_on_fd(oplock_notify_fd(), maxfd, &r_fds);
875 selrtn = sys_select(maxfd+1,&r_fds,&w_fds,NULL,&to);
878 END_PROFILE(smbd_idle);
882 if (run_events(smbd_event_context(), selrtn, &r_fds, &w_fds)) {
886 /* if we get EINTR then maybe we have received an oplock
887 signal - treat this as select returning 1. This is ugly, but
888 is the best we can do until the oplock code knows more about
890 if (selrtn == -1 && errno == EINTR) {
891 async_processing(&r_fds);
893 * After async processing we must go and do the select again, as
894 * the state of the flag in fds for the server file descriptor is
895 * indeterminate - we may have done I/O on it in the oplock processing. JRA.
902 /* something is wrong. Maybe the socket is dead? */
903 set_smb_read_error(get_srv_read_error(),SMB_READ_ERROR);
907 /* Did we timeout ? */
909 set_smb_read_error(get_srv_read_error(),SMB_READ_TIMEOUT);
914 * Ensure we process oplock break messages by preference.
915 * This is IMPORTANT ! Otherwise we can starve other processes
916 * sending us an oplock break message. JRA.
919 if (oplock_message_waiting(&r_fds)) {
920 async_processing(&r_fds);
922 * After async processing we must go and do the select again, as
923 * the state of the flag in fds for the server file descriptor is
924 * indeterminate - we may have done I/O on it in the oplock processing. JRA.
929 len = receive_smb_talloc(mem_ctx, smbd_server_fd(),
930 buffer, 0, p_unread, p_encrypted);
936 *buffer_len = (size_t)len;
942 * Only allow 5 outstanding trans requests. We're allocating memory, so
946 NTSTATUS allow_new_trans(struct trans_state *list, int mid)
949 for (; list != NULL; list = list->next) {
951 if (list->mid == mid) {
952 return NT_STATUS_INVALID_PARAMETER;
958 return NT_STATUS_INSUFFICIENT_RESOURCES;
964 /****************************************************************************
965 We're terminating and have closed all our files/connections etc.
966 If there are any pending local messages we need to respond to them
967 before termination so that other smbds don't think we just died whilst
969 ****************************************************************************/
971 void respond_to_all_remaining_local_messages(void)
974 * Assert we have no exclusive open oplocks.
977 if(get_number_of_exclusive_open_oplocks()) {
978 DEBUG(0,("respond_to_all_remaining_local_messages: PANIC : we have %d exclusive oplocks.\n",
979 get_number_of_exclusive_open_oplocks() ));
983 process_kernel_oplocks(smbd_messaging_context(), NULL);
990 These flags determine some of the permissions required to do an operation
992 Note that I don't set NEED_WRITE on some write operations because they
993 are used by some brain-dead clients when printing, and I don't want to
994 force write permissions on print services.
996 #define AS_USER (1<<0)
997 #define NEED_WRITE (1<<1) /* Must be paired with AS_USER */
998 #define TIME_INIT (1<<2)
999 #define CAN_IPC (1<<3) /* Must be paired with AS_USER */
1000 #define AS_GUEST (1<<5) /* Must *NOT* be paired with AS_USER */
1001 #define DO_CHDIR (1<<6)
1004 define a list of possible SMB messages and their corresponding
1005 functions. Any message that has a NULL function is unimplemented -
1006 please feel free to contribute implementations!
1008 static const struct smb_message_struct {
1010 void (*fn_new)(struct smb_request *req);
1012 } smb_messages[256] = {
1014 /* 0x00 */ { "SMBmkdir",reply_mkdir,AS_USER | NEED_WRITE},
1015 /* 0x01 */ { "SMBrmdir",reply_rmdir,AS_USER | NEED_WRITE},
1016 /* 0x02 */ { "SMBopen",reply_open,AS_USER },
1017 /* 0x03 */ { "SMBcreate",reply_mknew,AS_USER},
1018 /* 0x04 */ { "SMBclose",reply_close,AS_USER | CAN_IPC },
1019 /* 0x05 */ { "SMBflush",reply_flush,AS_USER},
1020 /* 0x06 */ { "SMBunlink",reply_unlink,AS_USER | NEED_WRITE },
1021 /* 0x07 */ { "SMBmv",reply_mv,AS_USER | NEED_WRITE },
1022 /* 0x08 */ { "SMBgetatr",reply_getatr,AS_USER},
1023 /* 0x09 */ { "SMBsetatr",reply_setatr,AS_USER | NEED_WRITE},
1024 /* 0x0a */ { "SMBread",reply_read,AS_USER},
1025 /* 0x0b */ { "SMBwrite",reply_write,AS_USER | CAN_IPC },
1026 /* 0x0c */ { "SMBlock",reply_lock,AS_USER},
1027 /* 0x0d */ { "SMBunlock",reply_unlock,AS_USER},
1028 /* 0x0e */ { "SMBctemp",reply_ctemp,AS_USER },
1029 /* 0x0f */ { "SMBmknew",reply_mknew,AS_USER},
1030 /* 0x10 */ { "SMBcheckpath",reply_checkpath,AS_USER},
1031 /* 0x11 */ { "SMBexit",reply_exit,DO_CHDIR},
1032 /* 0x12 */ { "SMBlseek",reply_lseek,AS_USER},
1033 /* 0x13 */ { "SMBlockread",reply_lockread,AS_USER},
1034 /* 0x14 */ { "SMBwriteunlock",reply_writeunlock,AS_USER},
1035 /* 0x15 */ { NULL, NULL, 0 },
1036 /* 0x16 */ { NULL, NULL, 0 },
1037 /* 0x17 */ { NULL, NULL, 0 },
1038 /* 0x18 */ { NULL, NULL, 0 },
1039 /* 0x19 */ { NULL, NULL, 0 },
1040 /* 0x1a */ { "SMBreadbraw",reply_readbraw,AS_USER},
1041 /* 0x1b */ { "SMBreadBmpx",reply_readbmpx,AS_USER},
1042 /* 0x1c */ { "SMBreadBs",reply_readbs,AS_USER },
1043 /* 0x1d */ { "SMBwritebraw",reply_writebraw,AS_USER},
1044 /* 0x1e */ { "SMBwriteBmpx",reply_writebmpx,AS_USER},
1045 /* 0x1f */ { "SMBwriteBs",reply_writebs,AS_USER},
1046 /* 0x20 */ { "SMBwritec", NULL,0},
1047 /* 0x21 */ { NULL, NULL, 0 },
1048 /* 0x22 */ { "SMBsetattrE",reply_setattrE,AS_USER | NEED_WRITE },
1049 /* 0x23 */ { "SMBgetattrE",reply_getattrE,AS_USER },
1050 /* 0x24 */ { "SMBlockingX",reply_lockingX,AS_USER },
1051 /* 0x25 */ { "SMBtrans",reply_trans,AS_USER | CAN_IPC },
1052 /* 0x26 */ { "SMBtranss",reply_transs,AS_USER | CAN_IPC},
1053 /* 0x27 */ { "SMBioctl",reply_ioctl,0},
1054 /* 0x28 */ { "SMBioctls", NULL,AS_USER},
1055 /* 0x29 */ { "SMBcopy",reply_copy,AS_USER | NEED_WRITE },
1056 /* 0x2a */ { "SMBmove", NULL,AS_USER | NEED_WRITE },
1057 /* 0x2b */ { "SMBecho",reply_echo,0},
1058 /* 0x2c */ { "SMBwriteclose",reply_writeclose,AS_USER},
1059 /* 0x2d */ { "SMBopenX",reply_open_and_X,AS_USER | CAN_IPC },
1060 /* 0x2e */ { "SMBreadX",reply_read_and_X,AS_USER | CAN_IPC },
1061 /* 0x2f */ { "SMBwriteX",reply_write_and_X,AS_USER | CAN_IPC },
1062 /* 0x30 */ { NULL, NULL, 0 },
1063 /* 0x31 */ { NULL, NULL, 0 },
1064 /* 0x32 */ { "SMBtrans2",reply_trans2, AS_USER | CAN_IPC },
1065 /* 0x33 */ { "SMBtranss2",reply_transs2, AS_USER},
1066 /* 0x34 */ { "SMBfindclose",reply_findclose,AS_USER},
1067 /* 0x35 */ { "SMBfindnclose",reply_findnclose,AS_USER},
1068 /* 0x36 */ { NULL, NULL, 0 },
1069 /* 0x37 */ { NULL, NULL, 0 },
1070 /* 0x38 */ { NULL, NULL, 0 },
1071 /* 0x39 */ { NULL, NULL, 0 },
1072 /* 0x3a */ { NULL, NULL, 0 },
1073 /* 0x3b */ { NULL, NULL, 0 },
1074 /* 0x3c */ { NULL, NULL, 0 },
1075 /* 0x3d */ { NULL, NULL, 0 },
1076 /* 0x3e */ { NULL, NULL, 0 },
1077 /* 0x3f */ { NULL, NULL, 0 },
1078 /* 0x40 */ { NULL, NULL, 0 },
1079 /* 0x41 */ { NULL, NULL, 0 },
1080 /* 0x42 */ { NULL, NULL, 0 },
1081 /* 0x43 */ { NULL, NULL, 0 },
1082 /* 0x44 */ { NULL, NULL, 0 },
1083 /* 0x45 */ { NULL, NULL, 0 },
1084 /* 0x46 */ { NULL, NULL, 0 },
1085 /* 0x47 */ { NULL, NULL, 0 },
1086 /* 0x48 */ { NULL, NULL, 0 },
1087 /* 0x49 */ { NULL, NULL, 0 },
1088 /* 0x4a */ { NULL, NULL, 0 },
1089 /* 0x4b */ { NULL, NULL, 0 },
1090 /* 0x4c */ { NULL, NULL, 0 },
1091 /* 0x4d */ { NULL, NULL, 0 },
1092 /* 0x4e */ { NULL, NULL, 0 },
1093 /* 0x4f */ { NULL, NULL, 0 },
1094 /* 0x50 */ { NULL, NULL, 0 },
1095 /* 0x51 */ { NULL, NULL, 0 },
1096 /* 0x52 */ { NULL, NULL, 0 },
1097 /* 0x53 */ { NULL, NULL, 0 },
1098 /* 0x54 */ { NULL, NULL, 0 },
1099 /* 0x55 */ { NULL, NULL, 0 },
1100 /* 0x56 */ { NULL, NULL, 0 },
1101 /* 0x57 */ { NULL, NULL, 0 },
1102 /* 0x58 */ { NULL, NULL, 0 },
1103 /* 0x59 */ { NULL, NULL, 0 },
1104 /* 0x5a */ { NULL, NULL, 0 },
1105 /* 0x5b */ { NULL, NULL, 0 },
1106 /* 0x5c */ { NULL, NULL, 0 },
1107 /* 0x5d */ { NULL, NULL, 0 },
1108 /* 0x5e */ { NULL, NULL, 0 },
1109 /* 0x5f */ { NULL, NULL, 0 },
1110 /* 0x60 */ { NULL, NULL, 0 },
1111 /* 0x61 */ { NULL, NULL, 0 },
1112 /* 0x62 */ { NULL, NULL, 0 },
1113 /* 0x63 */ { NULL, NULL, 0 },
1114 /* 0x64 */ { NULL, NULL, 0 },
1115 /* 0x65 */ { NULL, NULL, 0 },
1116 /* 0x66 */ { NULL, NULL, 0 },
1117 /* 0x67 */ { NULL, NULL, 0 },
1118 /* 0x68 */ { NULL, NULL, 0 },
1119 /* 0x69 */ { NULL, NULL, 0 },
1120 /* 0x6a */ { NULL, NULL, 0 },
1121 /* 0x6b */ { NULL, NULL, 0 },
1122 /* 0x6c */ { NULL, NULL, 0 },
1123 /* 0x6d */ { NULL, NULL, 0 },
1124 /* 0x6e */ { NULL, NULL, 0 },
1125 /* 0x6f */ { NULL, NULL, 0 },
1126 /* 0x70 */ { "SMBtcon",reply_tcon,0},
1127 /* 0x71 */ { "SMBtdis",reply_tdis,DO_CHDIR},
1128 /* 0x72 */ { "SMBnegprot",reply_negprot,0},
1129 /* 0x73 */ { "SMBsesssetupX",reply_sesssetup_and_X,0},
1130 /* 0x74 */ { "SMBulogoffX",reply_ulogoffX, 0}, /* ulogoff doesn't give a valid TID */
1131 /* 0x75 */ { "SMBtconX",reply_tcon_and_X,0},
1132 /* 0x76 */ { NULL, NULL, 0 },
1133 /* 0x77 */ { NULL, NULL, 0 },
1134 /* 0x78 */ { NULL, NULL, 0 },
1135 /* 0x79 */ { NULL, NULL, 0 },
1136 /* 0x7a */ { NULL, NULL, 0 },
1137 /* 0x7b */ { NULL, NULL, 0 },
1138 /* 0x7c */ { NULL, NULL, 0 },
1139 /* 0x7d */ { NULL, NULL, 0 },
1140 /* 0x7e */ { NULL, NULL, 0 },
1141 /* 0x7f */ { NULL, NULL, 0 },
1142 /* 0x80 */ { "SMBdskattr",reply_dskattr,AS_USER},
1143 /* 0x81 */ { "SMBsearch",reply_search,AS_USER},
1144 /* 0x82 */ { "SMBffirst",reply_search,AS_USER},
1145 /* 0x83 */ { "SMBfunique",reply_search,AS_USER},
1146 /* 0x84 */ { "SMBfclose",reply_fclose,AS_USER},
1147 /* 0x85 */ { NULL, NULL, 0 },
1148 /* 0x86 */ { NULL, NULL, 0 },
1149 /* 0x87 */ { NULL, NULL, 0 },
1150 /* 0x88 */ { NULL, NULL, 0 },
1151 /* 0x89 */ { NULL, NULL, 0 },
1152 /* 0x8a */ { NULL, NULL, 0 },
1153 /* 0x8b */ { NULL, NULL, 0 },
1154 /* 0x8c */ { NULL, NULL, 0 },
1155 /* 0x8d */ { NULL, NULL, 0 },
1156 /* 0x8e */ { NULL, NULL, 0 },
1157 /* 0x8f */ { NULL, NULL, 0 },
1158 /* 0x90 */ { NULL, NULL, 0 },
1159 /* 0x91 */ { NULL, NULL, 0 },
1160 /* 0x92 */ { NULL, NULL, 0 },
1161 /* 0x93 */ { NULL, NULL, 0 },
1162 /* 0x94 */ { NULL, NULL, 0 },
1163 /* 0x95 */ { NULL, NULL, 0 },
1164 /* 0x96 */ { NULL, NULL, 0 },
1165 /* 0x97 */ { NULL, NULL, 0 },
1166 /* 0x98 */ { NULL, NULL, 0 },
1167 /* 0x99 */ { NULL, NULL, 0 },
1168 /* 0x9a */ { NULL, NULL, 0 },
1169 /* 0x9b */ { NULL, NULL, 0 },
1170 /* 0x9c */ { NULL, NULL, 0 },
1171 /* 0x9d */ { NULL, NULL, 0 },
1172 /* 0x9e */ { NULL, NULL, 0 },
1173 /* 0x9f */ { NULL, NULL, 0 },
1174 /* 0xa0 */ { "SMBnttrans",reply_nttrans, AS_USER | CAN_IPC },
1175 /* 0xa1 */ { "SMBnttranss",reply_nttranss, AS_USER | CAN_IPC },
1176 /* 0xa2 */ { "SMBntcreateX",reply_ntcreate_and_X, AS_USER | CAN_IPC },
1177 /* 0xa3 */ { NULL, NULL, 0 },
1178 /* 0xa4 */ { "SMBntcancel",reply_ntcancel, 0 },
1179 /* 0xa5 */ { "SMBntrename",reply_ntrename, AS_USER | NEED_WRITE },
1180 /* 0xa6 */ { NULL, NULL, 0 },
1181 /* 0xa7 */ { NULL, NULL, 0 },
1182 /* 0xa8 */ { NULL, NULL, 0 },
1183 /* 0xa9 */ { NULL, NULL, 0 },
1184 /* 0xaa */ { NULL, NULL, 0 },
1185 /* 0xab */ { NULL, NULL, 0 },
1186 /* 0xac */ { NULL, NULL, 0 },
1187 /* 0xad */ { NULL, NULL, 0 },
1188 /* 0xae */ { NULL, NULL, 0 },
1189 /* 0xaf */ { NULL, NULL, 0 },
1190 /* 0xb0 */ { NULL, NULL, 0 },
1191 /* 0xb1 */ { NULL, NULL, 0 },
1192 /* 0xb2 */ { NULL, NULL, 0 },
1193 /* 0xb3 */ { NULL, NULL, 0 },
1194 /* 0xb4 */ { NULL, NULL, 0 },
1195 /* 0xb5 */ { NULL, NULL, 0 },
1196 /* 0xb6 */ { NULL, NULL, 0 },
1197 /* 0xb7 */ { NULL, NULL, 0 },
1198 /* 0xb8 */ { NULL, NULL, 0 },
1199 /* 0xb9 */ { NULL, NULL, 0 },
1200 /* 0xba */ { NULL, NULL, 0 },
1201 /* 0xbb */ { NULL, NULL, 0 },
1202 /* 0xbc */ { NULL, NULL, 0 },
1203 /* 0xbd */ { NULL, NULL, 0 },
1204 /* 0xbe */ { NULL, NULL, 0 },
1205 /* 0xbf */ { NULL, NULL, 0 },
1206 /* 0xc0 */ { "SMBsplopen",reply_printopen,AS_USER},
1207 /* 0xc1 */ { "SMBsplwr",reply_printwrite,AS_USER},
1208 /* 0xc2 */ { "SMBsplclose",reply_printclose,AS_USER},
1209 /* 0xc3 */ { "SMBsplretq",reply_printqueue,AS_USER},
1210 /* 0xc4 */ { NULL, NULL, 0 },
1211 /* 0xc5 */ { NULL, NULL, 0 },
1212 /* 0xc6 */ { NULL, NULL, 0 },
1213 /* 0xc7 */ { NULL, NULL, 0 },
1214 /* 0xc8 */ { NULL, NULL, 0 },
1215 /* 0xc9 */ { NULL, NULL, 0 },
1216 /* 0xca */ { NULL, NULL, 0 },
1217 /* 0xcb */ { NULL, NULL, 0 },
1218 /* 0xcc */ { NULL, NULL, 0 },
1219 /* 0xcd */ { NULL, NULL, 0 },
1220 /* 0xce */ { NULL, NULL, 0 },
1221 /* 0xcf */ { NULL, NULL, 0 },
1222 /* 0xd0 */ { "SMBsends",reply_sends,AS_GUEST},
1223 /* 0xd1 */ { "SMBsendb", NULL,AS_GUEST},
1224 /* 0xd2 */ { "SMBfwdname", NULL,AS_GUEST},
1225 /* 0xd3 */ { "SMBcancelf", NULL,AS_GUEST},
1226 /* 0xd4 */ { "SMBgetmac", NULL,AS_GUEST},
1227 /* 0xd5 */ { "SMBsendstrt",reply_sendstrt,AS_GUEST},
1228 /* 0xd6 */ { "SMBsendend",reply_sendend,AS_GUEST},
1229 /* 0xd7 */ { "SMBsendtxt",reply_sendtxt,AS_GUEST},
1230 /* 0xd8 */ { NULL, NULL, 0 },
1231 /* 0xd9 */ { NULL, NULL, 0 },
1232 /* 0xda */ { NULL, NULL, 0 },
1233 /* 0xdb */ { NULL, NULL, 0 },
1234 /* 0xdc */ { NULL, NULL, 0 },
1235 /* 0xdd */ { NULL, NULL, 0 },
1236 /* 0xde */ { NULL, NULL, 0 },
1237 /* 0xdf */ { NULL, NULL, 0 },
1238 /* 0xe0 */ { NULL, NULL, 0 },
1239 /* 0xe1 */ { NULL, NULL, 0 },
1240 /* 0xe2 */ { NULL, NULL, 0 },
1241 /* 0xe3 */ { NULL, NULL, 0 },
1242 /* 0xe4 */ { NULL, NULL, 0 },
1243 /* 0xe5 */ { NULL, NULL, 0 },
1244 /* 0xe6 */ { NULL, NULL, 0 },
1245 /* 0xe7 */ { NULL, NULL, 0 },
1246 /* 0xe8 */ { NULL, NULL, 0 },
1247 /* 0xe9 */ { NULL, NULL, 0 },
1248 /* 0xea */ { NULL, NULL, 0 },
1249 /* 0xeb */ { NULL, NULL, 0 },
1250 /* 0xec */ { NULL, NULL, 0 },
1251 /* 0xed */ { NULL, NULL, 0 },
1252 /* 0xee */ { NULL, NULL, 0 },
1253 /* 0xef */ { NULL, NULL, 0 },
1254 /* 0xf0 */ { NULL, NULL, 0 },
1255 /* 0xf1 */ { NULL, NULL, 0 },
1256 /* 0xf2 */ { NULL, NULL, 0 },
1257 /* 0xf3 */ { NULL, NULL, 0 },
1258 /* 0xf4 */ { NULL, NULL, 0 },
1259 /* 0xf5 */ { NULL, NULL, 0 },
1260 /* 0xf6 */ { NULL, NULL, 0 },
1261 /* 0xf7 */ { NULL, NULL, 0 },
1262 /* 0xf8 */ { NULL, NULL, 0 },
1263 /* 0xf9 */ { NULL, NULL, 0 },
1264 /* 0xfa */ { NULL, NULL, 0 },
1265 /* 0xfb */ { NULL, NULL, 0 },
1266 /* 0xfc */ { NULL, NULL, 0 },
1267 /* 0xfd */ { NULL, NULL, 0 },
1268 /* 0xfe */ { NULL, NULL, 0 },
1269 /* 0xff */ { NULL, NULL, 0 }
1273 /*******************************************************************
1274 allocate and initialize a reply packet
1275 ********************************************************************/
1277 void reply_outbuf(struct smb_request *req, uint8 num_words, uint32 num_bytes)
1280 * Protect against integer wrap
1282 if ((num_bytes > 0xffffff)
1283 || ((num_bytes + smb_size + num_words*2) > 0xffffff)) {
1285 asprintf(&msg, "num_bytes too large: %u",
1286 (unsigned)num_bytes);
1290 if (!(req->outbuf = TALLOC_ARRAY(
1292 smb_size + num_words*2 + num_bytes))) {
1293 smb_panic("could not allocate output buffer\n");
1296 construct_reply_common((char *)req->inbuf, (char *)req->outbuf);
1297 srv_set_message((char *)req->outbuf, num_words, num_bytes, false);
1299 * Zero out the word area, the caller has to take care of the bcc area
1302 if (num_words != 0) {
1303 memset(req->outbuf + smb_vwv0, 0, num_words*2);
1310 /*******************************************************************
1311 Dump a packet to a file.
1312 ********************************************************************/
1314 static void smb_dump(const char *name, int type, const char *data, ssize_t len)
1318 if (DEBUGLEVEL < 50) {
1322 if (len < 4) len = smb_len(data)+4;
1323 for (i=1;i<100;i++) {
1324 asprintf(&fname, "/tmp/%s.%d.%s", name, i,
1325 type ? "req" : "resp");
1329 fd = open(fname, O_WRONLY|O_CREAT|O_EXCL, 0644);
1330 if (fd != -1 || errno != EEXIST) break;
1333 ssize_t ret = write(fd, data, len);
1335 DEBUG(0,("smb_dump: problem: write returned %d\n", (int)ret ));
1337 DEBUG(0,("created %s len %lu\n", fname, (unsigned long)len));
1342 /****************************************************************************
1343 Prepare everything for calling the actual request function, and potentially
1344 call the request function via the "new" interface.
1346 Return False if the "legacy" function needs to be called, everything is
1349 Return True if we're done.
1351 I know this API sucks, but it is the one with the least code change I could
1353 ****************************************************************************/
1355 static connection_struct *switch_message(uint8 type, struct smb_request *req, int size)
1359 connection_struct *conn = NULL;
1361 static uint16 last_session_tag = UID_FIELD_INVALID;
1365 /* Make sure this is an SMB packet. smb_size contains NetBIOS header
1366 * so subtract 4 from it. */
1367 if (!valid_smb_header(req->inbuf)
1368 || (size < (smb_size - 4))) {
1369 DEBUG(2,("Non-SMB packet of length %d. Terminating server\n",
1370 smb_len(req->inbuf)));
1371 exit_server_cleanly("Non-SMB packet");
1374 if (smb_messages[type].fn_new == NULL) {
1375 DEBUG(0,("Unknown message type %d!\n",type));
1376 smb_dump("Unknown", 1, (char *)req->inbuf, size);
1377 reply_unknown_new(req, type);
1381 flags = smb_messages[type].flags;
1383 /* In share mode security we must ignore the vuid. */
1384 session_tag = (lp_security() == SEC_SHARE)
1385 ? UID_FIELD_INVALID : req->vuid;
1388 DEBUG(3,("switch message %s (pid %d) conn 0x%lx\n", smb_fn_name(type),
1389 (int)sys_getpid(), (unsigned long)conn));
1391 smb_dump(smb_fn_name(type), 1, (char *)req->inbuf, size);
1393 /* Ensure this value is replaced in the incoming packet. */
1394 SSVAL(req->inbuf,smb_uid,session_tag);
1397 * Ensure the correct username is in current_user_info. This is a
1398 * really ugly bugfix for problems with multiple session_setup_and_X's
1399 * being done and allowing %U and %G substitutions to work correctly.
1400 * There is a reason this code is done here, don't move it unless you
1401 * know what you're doing... :-).
1405 if (session_tag != last_session_tag) {
1406 user_struct *vuser = NULL;
1408 last_session_tag = session_tag;
1409 if(session_tag != UID_FIELD_INVALID) {
1410 vuser = get_valid_user_struct(session_tag);
1412 set_current_user_info(&vuser->user);
1417 /* Does this call need to be run as the connected user? */
1418 if (flags & AS_USER) {
1420 /* Does this call need a valid tree connection? */
1423 * Amazingly, the error code depends on the command
1426 if (type == SMBntcreateX) {
1427 reply_nterror(req, NT_STATUS_INVALID_HANDLE);
1429 reply_doserror(req, ERRSRV, ERRinvnid);
1434 if (!change_to_user(conn,session_tag)) {
1435 reply_nterror(req, NT_STATUS_DOS(ERRSRV, ERRbaduid));
1439 /* All NEED_WRITE and CAN_IPC flags must also have AS_USER. */
1441 /* Does it need write permission? */
1442 if ((flags & NEED_WRITE) && !CAN_WRITE(conn)) {
1443 reply_nterror(req, NT_STATUS_MEDIA_WRITE_PROTECTED);
1447 /* IPC services are limited */
1448 if (IS_IPC(conn) && !(flags & CAN_IPC)) {
1449 reply_doserror(req, ERRSRV,ERRaccess);
1453 /* This call needs to be run as root */
1454 change_to_root_user();
1457 /* load service specific parameters */
1459 if (req->encrypted) {
1460 conn->encrypted_tid = true;
1461 /* encrypted required from now on. */
1462 conn->encrypt_level = Required;
1463 } else if (ENCRYPTION_REQUIRED(conn)) {
1464 uint8 com = CVAL(req->inbuf,smb_com);
1465 if (com != SMBtrans2 && com != SMBtranss2) {
1466 exit_server_cleanly("encryption required "
1472 if (!set_current_service(conn,SVAL(req->inbuf,smb_flg),
1473 (flags & (AS_USER|DO_CHDIR)
1475 reply_doserror(req, ERRSRV, ERRaccess);
1478 conn->num_smb_operations++;
1481 /* does this protocol need to be run as guest? */
1482 if ((flags & AS_GUEST)
1483 && (!change_to_guest() ||
1484 !check_access(smbd_server_fd(), lp_hostsallow(-1),
1485 lp_hostsdeny(-1)))) {
1486 reply_doserror(req, ERRSRV, ERRaccess);
1490 smb_messages[type].fn_new(req);
1494 /****************************************************************************
1495 Construct a reply to the incoming packet.
1496 ****************************************************************************/
1498 static void construct_reply(char *inbuf, int size, size_t unread_bytes, bool encrypted)
1500 uint8 type = CVAL(inbuf,smb_com);
1501 connection_struct *conn;
1502 struct smb_request *req;
1508 if (!(req = talloc(talloc_tos(), struct smb_request))) {
1509 smb_panic("could not allocate smb_request");
1511 init_smb_request(req, (uint8 *)inbuf, unread_bytes, encrypted);
1513 conn = switch_message(type, req, size);
1515 if (req->unread_bytes) {
1516 /* writeX failed. drain socket. */
1517 if (drain_socket(smbd_server_fd(), req->unread_bytes) !=
1518 req->unread_bytes) {
1519 smb_panic("failed to drain pending bytes");
1521 req->unread_bytes = 0;
1524 if (req->outbuf == NULL) {
1528 if (CVAL(req->outbuf,0) == 0) {
1529 show_msg((char *)req->outbuf);
1532 if (!srv_send_smb(smbd_server_fd(),
1533 (char *)req->outbuf,
1534 IS_CONN_ENCRYPTED(conn)||req->encrypted)) {
1535 exit_server_cleanly("construct_reply: srv_send_smb failed.");
1543 /****************************************************************************
1544 Process an smb from the client
1545 ****************************************************************************/
1547 static void process_smb(char *inbuf, size_t nread, size_t unread_bytes, bool encrypted)
1549 static int trans_num;
1550 int msg_type = CVAL(inbuf,0);
1552 DO_PROFILE_INC(smb_count);
1554 if (trans_num == 0) {
1555 char addr[INET6_ADDRSTRLEN];
1557 /* on the first packet, check the global hosts allow/ hosts
1558 deny parameters before doing any parsing of the packet
1559 passed to us by the client. This prevents attacks on our
1560 parsing code from hosts not in the hosts allow list */
1562 if (!check_access(smbd_server_fd(), lp_hostsallow(-1),
1563 lp_hostsdeny(-1))) {
1564 /* send a negative session response "not listening on calling name" */
1565 static unsigned char buf[5] = {0x83, 0, 0, 1, 0x81};
1566 DEBUG( 1, ( "Connection denied from %s\n",
1567 client_addr(get_client_fd(),addr,sizeof(addr)) ) );
1568 (void)srv_send_smb(smbd_server_fd(),(char *)buf,false);
1569 exit_server_cleanly("connection denied");
1573 DEBUG( 6, ( "got message type 0x%x of len 0x%x\n", msg_type,
1575 DEBUG( 3, ( "Transaction %d of length %d (%u toread)\n", trans_num,
1577 (unsigned int)unread_bytes ));
1579 if (msg_type != 0) {
1581 * NetBIOS session request, keepalive, etc.
1583 reply_special(inbuf);
1589 construct_reply(inbuf,nread,unread_bytes,encrypted);
1594 /****************************************************************************
1595 Return a string containing the function name of a SMB command.
1596 ****************************************************************************/
1598 const char *smb_fn_name(int type)
1600 const char *unknown_name = "SMBunknown";
1602 if (smb_messages[type].name == NULL)
1603 return(unknown_name);
1605 return(smb_messages[type].name);
1608 /****************************************************************************
1609 Helper functions for contruct_reply.
1610 ****************************************************************************/
1612 static uint32 common_flags2 = FLAGS2_LONG_PATH_COMPONENTS|FLAGS2_32_BIT_ERROR_CODES;
1614 void add_to_common_flags2(uint32 v)
1619 void remove_from_common_flags2(uint32 v)
1621 common_flags2 &= ~v;
1624 void construct_reply_common(const char *inbuf, char *outbuf)
1626 srv_set_message(outbuf,0,0,false);
1628 SCVAL(outbuf,smb_com,CVAL(inbuf,smb_com));
1629 SIVAL(outbuf,smb_rcls,0);
1630 SCVAL(outbuf,smb_flg, FLAG_REPLY | (CVAL(inbuf,smb_flg) & FLAG_CASELESS_PATHNAMES));
1631 SSVAL(outbuf,smb_flg2,
1632 (SVAL(inbuf,smb_flg2) & FLAGS2_UNICODE_STRINGS) |
1634 memset(outbuf+smb_pidhigh,'\0',(smb_tid-smb_pidhigh));
1636 SSVAL(outbuf,smb_tid,SVAL(inbuf,smb_tid));
1637 SSVAL(outbuf,smb_pid,SVAL(inbuf,smb_pid));
1638 SSVAL(outbuf,smb_uid,SVAL(inbuf,smb_uid));
1639 SSVAL(outbuf,smb_mid,SVAL(inbuf,smb_mid));
1642 /****************************************************************************
1643 Construct a chained reply and add it to the already made reply
1644 ****************************************************************************/
1646 void chain_reply(struct smb_request *req)
1648 static char *orig_inbuf;
1651 * Dirty little const_discard: We mess with req->inbuf, which is
1652 * declared as const. If maybe at some point this routine gets
1653 * rewritten, this const_discard could go away.
1655 char *inbuf = CONST_DISCARD(char *, req->inbuf);
1656 int size = smb_len(req->inbuf)+4;
1658 int smb_com1, smb_com2 = CVAL(inbuf,smb_vwv0);
1659 unsigned smb_off2 = SVAL(inbuf,smb_vwv1);
1663 char inbuf_saved[smb_wct];
1664 char *outbuf = (char *)req->outbuf;
1665 size_t outsize = smb_len(outbuf) + 4;
1666 size_t outsize_padded;
1667 size_t ofs, to_move;
1669 struct smb_request *req2;
1670 size_t caller_outputlen;
1671 char *caller_output;
1673 /* Maybe its not chained, or it's an error packet. */
1674 if (smb_com2 == 0xFF || SVAL(outbuf,smb_rcls) != 0) {
1675 SCVAL(outbuf,smb_vwv0,0xFF);
1679 if (chain_size == 0) {
1680 /* this is the first part of the chain */
1685 * We need to save the output the caller added to the chain so that we
1686 * can splice it into the final output buffer later.
1689 caller_outputlen = outsize - smb_wct;
1691 caller_output = (char *)memdup(outbuf + smb_wct, caller_outputlen);
1693 if (caller_output == NULL) {
1694 /* TODO: NT_STATUS_NO_MEMORY */
1695 smb_panic("could not dup outbuf");
1699 * The original Win95 redirector dies on a reply to
1700 * a lockingX and read chain unless the chain reply is
1701 * 4 byte aligned. JRA.
1704 outsize_padded = (outsize + 3) & ~3;
1707 * remember how much the caller added to the chain, only counting
1708 * stuff after the parameter words
1710 chain_size += outsize_padded - smb_wct;
1713 * work out pointers into the original packets. The
1714 * headers on these need to be filled in
1716 inbuf2 = orig_inbuf + smb_off2 + 4 - smb_wct;
1718 /* remember the original command type */
1719 smb_com1 = CVAL(orig_inbuf,smb_com);
1721 /* save the data which will be overwritten by the new headers */
1722 memcpy(inbuf_saved,inbuf2,smb_wct);
1724 /* give the new packet the same header as the last part of the SMB */
1725 memmove(inbuf2,inbuf,smb_wct);
1727 /* create the in buffer */
1728 SCVAL(inbuf2,smb_com,smb_com2);
1730 /* work out the new size for the in buffer. */
1731 new_size = size - (inbuf2 - inbuf);
1733 DEBUG(0,("chain_reply: chain packet size incorrect "
1734 "(orig size = %d, offset = %d)\n",
1735 size, (int)(inbuf2 - inbuf) ));
1736 exit_server_cleanly("Bad chained packet");
1740 /* And set it in the header. */
1741 smb_setlen(inbuf2, new_size - 4);
1743 DEBUG(3,("Chained message\n"));
1746 if (!(req2 = talloc(talloc_tos(), struct smb_request))) {
1747 smb_panic("could not allocate smb_request");
1749 init_smb_request(req2, (uint8 *)inbuf2,0, req->encrypted);
1751 /* process the request */
1752 switch_message(smb_com2, req2, new_size);
1755 * We don't accept deferred operations in chained requests.
1757 SMB_ASSERT(req2->outbuf != NULL);
1758 outsize2 = smb_len(req2->outbuf)+4;
1761 * Move away the new command output so that caller_output fits in,
1762 * copy in the caller_output saved above.
1765 SMB_ASSERT(outsize_padded >= smb_wct);
1768 * "ofs" is the space we need for caller_output. Equal to
1769 * caller_outputlen plus the padding.
1772 ofs = outsize_padded - smb_wct;
1775 * "to_move" is the amount of bytes the secondary routine gave us
1778 to_move = outsize2 - smb_wct;
1780 if (to_move + ofs + smb_wct + chain_size > max_send) {
1781 smb_panic("replies too large -- would have to cut");
1785 * In the "new" API "outbuf" is allocated via reply_outbuf, just for
1786 * the first request in the chain. So we have to re-allocate it. In
1787 * the "old" API the only outbuf ever used is the global OutBuffer
1788 * which is always large enough.
1791 outbuf = TALLOC_REALLOC_ARRAY(NULL, outbuf, char,
1792 to_move + ofs + smb_wct);
1793 if (outbuf == NULL) {
1794 smb_panic("could not realloc outbuf");
1797 req->outbuf = (uint8 *)outbuf;
1799 memmove(outbuf + smb_wct + ofs, req2->outbuf + smb_wct, to_move);
1800 memcpy(outbuf + smb_wct, caller_output, caller_outputlen);
1803 * copy the new reply header over the old one but preserve the smb_com
1806 memmove(outbuf, req2->outbuf, smb_wct);
1807 SCVAL(outbuf, smb_com, smb_com1);
1810 * We've just copied in the whole "wct" area from the secondary
1811 * function. Fix up the chaining: com2 and the offset need to be
1815 SCVAL(outbuf, smb_vwv0, smb_com2);
1816 SSVAL(outbuf, smb_vwv1, chain_size + smb_wct - 4);
1818 if (outsize_padded > outsize) {
1821 * Due to padding we have some uninitialized bytes after the
1825 memset(outbuf + outsize, 0, outsize_padded - outsize);
1828 smb_setlen(outbuf, outsize2 + chain_size - 4);
1831 * restore the saved data, being careful not to overwrite any data
1832 * from the reply header
1834 memcpy(inbuf2,inbuf_saved,smb_wct);
1836 SAFE_FREE(caller_output);
1842 /****************************************************************************
1843 Setup the needed select timeout in milliseconds.
1844 ****************************************************************************/
1846 static int setup_select_timeout(void)
1850 select_timeout = SMBD_SELECT_TIMEOUT*1000;
1852 if (print_notify_messages_pending()) {
1853 select_timeout = MIN(select_timeout, 1000);
1856 return select_timeout;
1859 /****************************************************************************
1860 Check if services need reloading.
1861 ****************************************************************************/
1863 void check_reload(time_t t)
1865 static pid_t mypid = 0;
1866 static time_t last_smb_conf_reload_time = 0;
1867 static time_t last_printer_reload_time = 0;
1868 time_t printcap_cache_time = (time_t)lp_printcap_cache_time();
1870 if(last_smb_conf_reload_time == 0) {
1871 last_smb_conf_reload_time = t;
1872 /* Our printing subsystem might not be ready at smbd start up.
1873 Then no printer is available till the first printers check
1874 is performed. A lower initial interval circumvents this. */
1875 if ( printcap_cache_time > 60 )
1876 last_printer_reload_time = t - printcap_cache_time + 60;
1878 last_printer_reload_time = t;
1881 if (mypid != getpid()) { /* First time or fork happened meanwhile */
1882 /* randomize over 60 second the printcap reload to avoid all
1883 * process hitting cupsd at the same time */
1884 int time_range = 60;
1886 last_printer_reload_time += random() % time_range;
1890 if (reload_after_sighup || (t >= last_smb_conf_reload_time+SMBD_RELOAD_CHECK)) {
1891 reload_services(True);
1892 reload_after_sighup = False;
1893 last_smb_conf_reload_time = t;
1896 /* 'printcap cache time = 0' disable the feature */
1898 if ( printcap_cache_time != 0 )
1900 /* see if it's time to reload or if the clock has been set back */
1902 if ( (t >= last_printer_reload_time+printcap_cache_time)
1903 || (t-last_printer_reload_time < 0) )
1905 DEBUG( 3,( "Printcap cache time expired.\n"));
1907 last_printer_reload_time = t;
1912 /****************************************************************************
1913 Process any timeout housekeeping. Return False if the caller should exit.
1914 ****************************************************************************/
1916 static bool timeout_processing(int *select_timeout,
1917 time_t *last_timeout_processing_time)
1921 if (*get_srv_read_error() == SMB_READ_EOF) {
1922 DEBUG(3,("timeout_processing: End of file from client (client has disconnected).\n"));
1926 if (*get_srv_read_error() == SMB_READ_ERROR) {
1927 DEBUG(3,("timeout_processing: receive_smb error (%s) Exiting\n",
1932 if (*get_srv_read_error() == SMB_READ_BAD_SIG) {
1933 DEBUG(3,("timeout_processing: receive_smb error bad smb signature. Exiting\n"));
1937 *last_timeout_processing_time = t = time(NULL);
1939 /* become root again if waiting */
1940 change_to_root_user();
1942 /* check if we need to reload services */
1945 if(global_machine_password_needs_changing &&
1946 /* for ADS we need to do a regular ADS password change, not a domain
1948 lp_security() == SEC_DOMAIN) {
1950 unsigned char trust_passwd_hash[16];
1954 * We're in domain level security, and the code that
1955 * read the machine password flagged that the machine
1956 * password needs changing.
1960 * First, open the machine password file with an exclusive lock.
1963 if (secrets_lock_trust_account_password(lp_workgroup(), True) == False) {
1964 DEBUG(0,("process: unable to lock the machine account password for \
1965 machine %s in domain %s.\n", global_myname(), lp_workgroup() ));
1969 if(!secrets_fetch_trust_account_password(lp_workgroup(), trust_passwd_hash, &lct, NULL)) {
1970 DEBUG(0,("process: unable to read the machine account password for \
1971 machine %s in domain %s.\n", global_myname(), lp_workgroup()));
1972 secrets_lock_trust_account_password(lp_workgroup(), False);
1977 * Make sure someone else hasn't already done this.
1980 if(t < lct + lp_machine_password_timeout()) {
1981 global_machine_password_needs_changing = False;
1982 secrets_lock_trust_account_password(lp_workgroup(), False);
1986 /* always just contact the PDC here */
1988 change_trust_account_password( lp_workgroup(), NULL);
1989 global_machine_password_needs_changing = False;
1990 secrets_lock_trust_account_password(lp_workgroup(), False);
1993 /* update printer queue caches if necessary */
1995 update_monitored_printq_cache();
1998 * Now we are root, check if the log files need pruning.
1999 * Force a log file check.
2001 force_check_log_size();
2004 /* Send any queued printer notify message to interested smbd's. */
2006 print_notify_send_messages(smbd_messaging_context(), 0);
2009 * Modify the select timeout depending upon
2010 * what we have remaining in our queues.
2013 *select_timeout = setup_select_timeout();
2018 /****************************************************************************
2019 Process commands from the client
2020 ****************************************************************************/
2022 void smbd_process(void)
2024 time_t last_timeout_processing_time = time(NULL);
2025 unsigned int num_smbs = 0;
2026 size_t unread_bytes = 0;
2028 max_recv = MIN(lp_maxxmit(),BUFFER_SIZE);
2031 int select_timeout = setup_select_timeout();
2035 bool encrypted = false;
2036 TALLOC_CTX *frame = talloc_stackframe_pool(8192);
2040 /* Did someone ask for immediate checks on things like blocking locks ? */
2041 if (select_timeout == 0) {
2042 if(!timeout_processing(&select_timeout,
2043 &last_timeout_processing_time))
2045 num_smbs = 0; /* Reset smb counter. */
2048 run_events(smbd_event_context(), 0, NULL, NULL);
2050 while (!receive_message_or_smb(talloc_tos(), &inbuf, &inbuf_len,
2054 if(!timeout_processing(&select_timeout,
2055 &last_timeout_processing_time))
2057 num_smbs = 0; /* Reset smb counter. */
2062 * Ensure we do timeout processing if the SMB we just got was
2063 * only an echo request. This allows us to set the select
2064 * timeout in 'receive_message_or_smb()' to any value we like
2065 * without worrying that the client will send echo requests
2066 * faster than the select timeout, thus starving out the
2067 * essential processing (change notify, blocking locks) that
2068 * the timeout code does. JRA.
2070 num_echos = smb_echo_count;
2072 process_smb(inbuf, inbuf_len, unread_bytes, encrypted);
2076 if (smb_echo_count != num_echos) {
2077 if(!timeout_processing( &select_timeout, &last_timeout_processing_time))
2079 num_smbs = 0; /* Reset smb counter. */
2085 * If we are getting smb requests in a constant stream
2086 * with no echos, make sure we attempt timeout processing
2087 * every select_timeout milliseconds - but only check for this
2088 * every 200 smb requests.
2091 if ((num_smbs % 200) == 0) {
2092 time_t new_check_time = time(NULL);
2093 if(new_check_time - last_timeout_processing_time >= (select_timeout/1000)) {
2094 if(!timeout_processing(
2096 &last_timeout_processing_time))
2098 num_smbs = 0; /* Reset smb counter. */
2099 last_timeout_processing_time = new_check_time; /* Reset time. */
2103 /* The timeout_processing function isn't run nearly
2104 often enough to implement 'max log size' without
2105 overrunning the size of the file by many megabytes.
2106 This is especially true if we are running at debug
2107 level 10. Checking every 50 SMBs is a nice
2108 tradeoff of performance vs log file size overrun. */
2110 if ((num_smbs % 50) == 0 && need_to_check_log_size()) {
2111 change_to_root_user();