2 Unix SMB/CIFS implementation.
3 process incoming packets - main loop
4 Copyright (C) Andrew Tridgell 1992-1998
5 Copyright (C) Volker Lendecke 2005
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 2 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, write to the Free Software
19 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
24 extern uint16 global_smbpid;
26 extern struct auth_context *negprot_global_auth_context;
27 extern int smb_echo_count;
29 struct timeval smb_last_time;
31 static char *InBuffer = NULL;
32 static char *OutBuffer = NULL;
33 static char *current_inbuf = NULL;
36 * Size of data we can send to client. Set
37 * by the client for all protocols above CORE.
38 * Set by us for CORE protocol.
40 int max_send = BUFFER_SIZE;
42 * Size of the data we can receive. Set by us.
43 * Can be modified by the max xmit parameter.
45 int max_recv = BUFFER_SIZE;
47 extern int last_message;
48 extern userdom_struct current_user_info;
49 extern int smb_read_error;
50 SIG_ATOMIC_T reload_after_sighup = 0;
51 SIG_ATOMIC_T got_sig_term = 0;
52 extern BOOL global_machine_password_needs_changing;
55 /****************************************************************************
56 Function to return the current request mid from Inbuffer.
57 ****************************************************************************/
59 uint16 get_current_mid(void)
61 return SVAL(InBuffer,smb_mid);
64 /****************************************************************************
65 structure to hold a linked list of queued messages.
67 ****************************************************************************/
69 static struct pending_message_list *deferred_open_queue;
71 /****************************************************************************
72 Function to push a message onto the tail of a linked list of smb messages ready
74 ****************************************************************************/
76 static BOOL push_queued_message(char *buf, int msg_len,
77 struct timeval request_time,
78 struct timeval end_time,
79 char *private_data, size_t private_len)
81 struct pending_message_list *tmp_msg;
82 struct pending_message_list *msg;
84 msg = TALLOC_ZERO_P(NULL, struct pending_message_list);
87 DEBUG(0,("push_message: malloc fail (1)\n"));
91 msg->buf = data_blob_talloc(msg, buf, msg_len);
92 if(msg->buf.data == NULL) {
93 DEBUG(0,("push_message: malloc fail (2)\n"));
98 msg->request_time = request_time;
99 msg->end_time = end_time;
102 msg->private_data = data_blob_talloc(msg, private_data,
104 if (msg->private_data.data == NULL) {
105 DEBUG(0,("push_message: malloc fail (3)\n"));
111 DLIST_ADD_END(deferred_open_queue, msg, tmp_msg);
113 DEBUG(10,("push_message: pushed message length %u on "
114 "deferred_open_queue\n", (unsigned int)msg_len));
119 /****************************************************************************
120 Function to delete a sharing violation open message by mid.
121 ****************************************************************************/
123 void remove_deferred_open_smb_message(uint16 mid)
125 struct pending_message_list *pml;
127 for (pml = deferred_open_queue; pml; pml = pml->next) {
128 if (mid == SVAL(pml->buf.data,smb_mid)) {
129 DEBUG(10,("remove_sharing_violation_open_smb_message: "
130 "deleting mid %u len %u\n",
132 (unsigned int)pml->buf.length ));
133 DLIST_REMOVE(deferred_open_queue, pml);
140 /****************************************************************************
141 Move a sharing violation open retry message to the front of the list and
142 schedule it for immediate processing.
143 ****************************************************************************/
145 void schedule_deferred_open_smb_message(uint16 mid)
147 struct pending_message_list *pml;
150 for (pml = deferred_open_queue; pml; pml = pml->next) {
151 uint16 msg_mid = SVAL(pml->buf.data,smb_mid);
152 DEBUG(10,("schedule_deferred_open_smb_message: [%d] msg_mid = %u\n", i++,
153 (unsigned int)msg_mid ));
154 if (mid == msg_mid) {
155 DEBUG(10,("schedule_deferred_open_smb_message: scheduling mid %u\n",
157 pml->end_time.tv_sec = 0;
158 pml->end_time.tv_usec = 0;
159 DLIST_PROMOTE(deferred_open_queue, pml);
164 DEBUG(10,("schedule_deferred_open_smb_message: failed to find message mid %u\n",
168 /****************************************************************************
169 Return true if this mid is on the deferred queue.
170 ****************************************************************************/
172 BOOL open_was_deferred(uint16 mid)
174 struct pending_message_list *pml;
176 for (pml = deferred_open_queue; pml; pml = pml->next) {
177 if (SVAL(pml->buf.data,smb_mid) == mid) {
178 set_saved_ntstatus(NT_STATUS_OK);
185 /****************************************************************************
186 Return the message queued by this mid.
187 ****************************************************************************/
189 struct pending_message_list *get_open_deferred_message(uint16 mid)
191 struct pending_message_list *pml;
193 for (pml = deferred_open_queue; pml; pml = pml->next) {
194 if (SVAL(pml->buf.data,smb_mid) == mid) {
201 /****************************************************************************
202 Function to push a deferred open smb message onto a linked list of local smb
203 messages ready for processing.
204 ****************************************************************************/
206 BOOL push_deferred_smb_message(uint16 mid,
207 struct timeval request_time,
208 struct timeval timeout,
209 char *private_data, size_t priv_len)
211 struct timeval end_time;
213 end_time = timeval_sum(&request_time, &timeout);
215 DEBUG(10,("push_deferred_open_smb_message: pushing message len %u mid %u "
216 "timeout time [%u.%06u]\n",
217 (unsigned int) smb_len(current_inbuf)+4, (unsigned int)mid,
218 (unsigned int)end_time.tv_sec,
219 (unsigned int)end_time.tv_usec));
221 return push_queued_message(current_inbuf, smb_len(current_inbuf)+4,
222 request_time, end_time,
223 private_data, priv_len);
226 static struct timed_event *timed_events;
229 struct timed_event *next, *prev;
231 const char *event_name;
232 void (*handler)(struct timed_event *te,
233 const struct timeval *now,
238 static int timed_event_destructor(void *p)
240 struct timed_event *te = talloc_get_type_abort(p, struct timed_event);
241 DEBUG(10, ("Destroying timed event %lx \"%s\"\n", (unsigned long)te,
243 DLIST_REMOVE(timed_events, te);
247 /****************************************************************************
248 Schedule a function for future calling, cancel with talloc_free().
249 It's the responsibility of the handler to call talloc_free() on the event
251 ****************************************************************************/
253 struct timed_event *add_timed_event(TALLOC_CTX *mem_ctx,
255 const char *event_name,
256 void (*handler)(struct timed_event *te,
257 const struct timeval *now,
261 struct timed_event *te, *last_te, *cur_te;
263 te = TALLOC_P(mem_ctx, struct timed_event);
265 DEBUG(0, ("talloc failed\n"));
270 te->event_name = event_name;
271 te->handler = handler;
272 te->private_data = private_data;
274 /* keep the list ordered */
276 for (cur_te = timed_events; cur_te; cur_te = cur_te->next) {
277 /* if the new event comes before the current one break */
278 if (!timeval_is_zero(&cur_te->when) &&
279 timeval_compare(&te->when, &cur_te->when) < 0) {
285 DLIST_ADD_AFTER(timed_events, te, last_te);
286 talloc_set_destructor(te, timed_event_destructor);
288 DEBUG(10, ("Added timed event \"%s\": %lx\n", event_name,
293 static void run_events(void)
297 if (timed_events == NULL) {
298 /* No syscall if there are no events */
299 DEBUG(10, ("run_events: No events\n"));
305 if (timeval_compare(&now, &timed_events->when) < 0) {
306 /* Nothing to do yet */
307 DEBUG(10, ("run_events: Nothing to do\n"));
311 DEBUG(10, ("Running event \"%s\" %lx\n", timed_events->event_name,
312 (unsigned long)timed_events));
314 timed_events->handler(timed_events, &now, timed_events->private_data);
318 struct timeval timed_events_timeout(void)
320 struct timeval now, timeout;
322 if (timed_events == NULL) {
323 return timeval_set(SMBD_SELECT_TIMEOUT, 0);
326 now = timeval_current();
327 timeout = timeval_until(&now, &timed_events->when);
329 DEBUG(10, ("timed_events_timeout: %d/%d\n", (int)timeout.tv_sec,
330 (int)timeout.tv_usec));
336 struct timed_event *te;
337 struct timeval interval;
338 BOOL (*handler)(const struct timeval *now, void *private_data);
342 static void idle_event_handler(struct timed_event *te,
343 const struct timeval *now,
346 struct idle_event *event =
347 talloc_get_type_abort(private_data, struct idle_event);
349 talloc_free(event->te);
351 if (!event->handler(now, event->private_data)) {
352 /* Don't repeat, delete ourselves */
357 event->te = add_timed_event(event, timeval_sum(now, &event->interval),
358 "idle_event_handler",
359 idle_event_handler, event);
361 /* We can't do much but fail here. */
362 SMB_ASSERT(event->te != NULL);
365 struct idle_event *add_idle_event(TALLOC_CTX *mem_ctx,
366 struct timeval interval,
367 BOOL (*handler)(const struct timeval *now,
371 struct idle_event *result;
372 struct timeval now = timeval_current();
374 result = TALLOC_P(mem_ctx, struct idle_event);
375 if (result == NULL) {
376 DEBUG(0, ("talloc failed\n"));
380 result->interval = interval;
381 result->handler = handler;
382 result->private_data = private_data;
384 result->te = add_timed_event(result, timeval_sum(&now, &interval),
385 "idle_event_handler",
386 idle_event_handler, result);
387 if (result->te == NULL) {
388 DEBUG(0, ("add_timed_event failed\n"));
396 /****************************************************************************
397 Do all async processing in here. This includes kernel oplock messages, change
399 ****************************************************************************/
401 static void async_processing(void)
403 DEBUG(10,("async_processing: Doing async processing.\n"));
407 process_kernel_oplocks();
409 /* Do the aio check again after receive_local_message as it does a
410 select and may have eaten our signal. */
411 /* Is this till true? -- vl */
415 exit_server("Caught TERM signal");
418 /* check for async change notify events */
419 process_pending_change_notify_queue(0);
421 /* check for sighup processing */
422 if (reload_after_sighup) {
423 change_to_root_user();
424 DEBUG(1,("Reloading services after SIGHUP\n"));
425 reload_services(False);
426 reload_after_sighup = 0;
430 /****************************************************************************
431 Do a select on an two fd's - with timeout.
433 If a local udp message has been pushed onto the
434 queue (this can only happen during oplock break
435 processing) call async_processing()
437 If a pending smb message has been pushed onto the
438 queue (this can only happen during oplock break
439 processing) return this next.
441 If the first smbfd is ready then read an smb from it.
442 if the second (loopback UDP) fd is ready then read a message
443 from it and setup the buffer header to identify the length
445 Returns False on timeout or error.
448 The timeout is in milliseconds
449 ****************************************************************************/
451 static BOOL receive_message_or_smb(char *buffer, int buffer_len, int timeout)
455 struct timeval to = timeval_set(SMBD_SELECT_TIMEOUT, 0);
463 to.tv_sec = timeout / 1000;
464 to.tv_usec = (timeout % 1000) * 1000;
468 * Note that this call must be before processing any SMB
469 * messages as we need to synchronously process any messages
470 * we may have sent to ourselves from the previous SMB.
475 * Check to see if we already have a message on the deferred open queue
476 * and it's time to schedule.
478 if(deferred_open_queue != NULL) {
479 BOOL pop_message = False;
480 struct pending_message_list *msg = deferred_open_queue;
482 if (timeval_is_zero(&msg->end_time)) {
489 tdif = usec_time_diff(&msg->end_time, &tv);
491 /* Timed out. Schedule...*/
493 DEBUG(10,("receive_message_or_smb: queued message timed out.\n"));
495 /* Make a more accurate select timeout. */
496 to.tv_sec = tdif / 1000000;
497 to.tv_usec = tdif % 1000000;
498 DEBUG(10,("receive_message_or_smb: select with timeout of [%u.%06u]\n",
499 (unsigned int)to.tv_sec, (unsigned int)to.tv_usec ));
504 memcpy(buffer, msg->buf.data, MIN(buffer_len, msg->buf.length));
506 /* We leave this message on the queue so the open code can
507 know this is a retry. */
508 DEBUG(5,("receive_message_or_smb: returning deferred open smb message.\n"));
514 * Setup the select read fd set.
520 * Ensure we process oplock break messages by preference.
521 * We have to do this before the select, after the select
522 * and if the select returns EINTR. This is due to the fact
523 * that the selects called from async_processing can eat an EINTR
524 * caused by a signal (we can't take the break message there).
525 * This is hideously complex - *MUST* be simplified for 3.0 ! JRA.
528 if (oplock_message_waiting(&fds)) {
529 DEBUG(10,("receive_message_or_smb: oplock_message is waiting.\n"));
532 * After async processing we must go and do the select again, as
533 * the state of the flag in fds for the server file descriptor is
534 * indeterminate - we may have done I/O on it in the oplock processing. JRA.
540 struct timeval tmp = timed_events_timeout();
541 to = timeval_min(&to, &tmp);
542 if (timeval_is_zero(&to)) {
547 FD_SET(smbd_server_fd(),&fds);
548 maxfd = setup_oplock_select_set(&fds);
550 selrtn = sys_select(MAX(maxfd,smbd_server_fd())+1,&fds,NULL,NULL,&to);
552 /* if we get EINTR then maybe we have received an oplock
553 signal - treat this as select returning 1. This is ugly, but
554 is the best we can do until the oplock code knows more about
556 if (selrtn == -1 && errno == EINTR) {
559 * After async processing we must go and do the select again, as
560 * the state of the flag in fds for the server file descriptor is
561 * indeterminate - we may have done I/O on it in the oplock processing. JRA.
568 /* something is wrong. Maybe the socket is dead? */
569 smb_read_error = READ_ERROR;
573 /* Did we timeout ? */
575 smb_read_error = READ_TIMEOUT;
580 * Ensure we process oplock break messages by preference.
581 * This is IMPORTANT ! Otherwise we can starve other processes
582 * sending us an oplock break message. JRA.
585 if (oplock_message_waiting(&fds)) {
588 * After async processing we must go and do the select again, as
589 * the state of the flag in fds for the server file descriptor is
590 * indeterminate - we may have done I/O on it in the oplock processing. JRA.
595 return receive_smb(smbd_server_fd(), buffer, 0);
598 /****************************************************************************
599 Get the next SMB packet, doing the local message processing automatically.
600 ****************************************************************************/
602 BOOL receive_next_smb(char *inbuf, int bufsize, int timeout)
608 ret = receive_message_or_smb(inbuf,bufsize,timeout);
610 got_keepalive = (ret && (CVAL(inbuf,0) == SMBkeepalive));
611 } while (ret && got_keepalive);
616 /****************************************************************************
617 We're terminating and have closed all our files/connections etc.
618 If there are any pending local messages we need to respond to them
619 before termination so that other smbds don't think we just died whilst
621 ****************************************************************************/
623 void respond_to_all_remaining_local_messages(void)
626 * Assert we have no exclusive open oplocks.
629 if(get_number_of_exclusive_open_oplocks()) {
630 DEBUG(0,("respond_to_all_remaining_local_messages: PANIC : we have %d exclusive oplocks.\n",
631 get_number_of_exclusive_open_oplocks() ));
635 process_kernel_oplocks();
642 These flags determine some of the permissions required to do an operation
644 Note that I don't set NEED_WRITE on some write operations because they
645 are used by some brain-dead clients when printing, and I don't want to
646 force write permissions on print services.
648 #define AS_USER (1<<0)
649 #define NEED_WRITE (1<<1)
650 #define TIME_INIT (1<<2)
651 #define CAN_IPC (1<<3)
652 #define AS_GUEST (1<<5)
653 #define DO_CHDIR (1<<6)
656 define a list of possible SMB messages and their corresponding
657 functions. Any message that has a NULL function is unimplemented -
658 please feel free to contribute implementations!
660 static const struct smb_message_struct {
662 int (*fn)(connection_struct *conn, char *, char *, int, int);
664 } smb_messages[256] = {
666 /* 0x00 */ { "SMBmkdir",reply_mkdir,AS_USER | NEED_WRITE},
667 /* 0x01 */ { "SMBrmdir",reply_rmdir,AS_USER | NEED_WRITE},
668 /* 0x02 */ { "SMBopen",reply_open,AS_USER },
669 /* 0x03 */ { "SMBcreate",reply_mknew,AS_USER},
670 /* 0x04 */ { "SMBclose",reply_close,AS_USER | CAN_IPC },
671 /* 0x05 */ { "SMBflush",reply_flush,AS_USER},
672 /* 0x06 */ { "SMBunlink",reply_unlink,AS_USER | NEED_WRITE },
673 /* 0x07 */ { "SMBmv",reply_mv,AS_USER | NEED_WRITE },
674 /* 0x08 */ { "SMBgetatr",reply_getatr,AS_USER},
675 /* 0x09 */ { "SMBsetatr",reply_setatr,AS_USER | NEED_WRITE},
676 /* 0x0a */ { "SMBread",reply_read,AS_USER},
677 /* 0x0b */ { "SMBwrite",reply_write,AS_USER | CAN_IPC },
678 /* 0x0c */ { "SMBlock",reply_lock,AS_USER},
679 /* 0x0d */ { "SMBunlock",reply_unlock,AS_USER},
680 /* 0x0e */ { "SMBctemp",reply_ctemp,AS_USER },
681 /* 0x0f */ { "SMBmknew",reply_mknew,AS_USER},
682 /* 0x10 */ { "SMBchkpth",reply_chkpth,AS_USER},
683 /* 0x11 */ { "SMBexit",reply_exit,DO_CHDIR},
684 /* 0x12 */ { "SMBlseek",reply_lseek,AS_USER},
685 /* 0x13 */ { "SMBlockread",reply_lockread,AS_USER},
686 /* 0x14 */ { "SMBwriteunlock",reply_writeunlock,AS_USER},
687 /* 0x15 */ { NULL, NULL, 0 },
688 /* 0x16 */ { NULL, NULL, 0 },
689 /* 0x17 */ { NULL, NULL, 0 },
690 /* 0x18 */ { NULL, NULL, 0 },
691 /* 0x19 */ { NULL, NULL, 0 },
692 /* 0x1a */ { "SMBreadbraw",reply_readbraw,AS_USER},
693 /* 0x1b */ { "SMBreadBmpx",reply_readbmpx,AS_USER},
694 /* 0x1c */ { "SMBreadBs",NULL,0 },
695 /* 0x1d */ { "SMBwritebraw",reply_writebraw,AS_USER},
696 /* 0x1e */ { "SMBwriteBmpx",reply_writebmpx,AS_USER},
697 /* 0x1f */ { "SMBwriteBs",reply_writebs,AS_USER},
698 /* 0x20 */ { "SMBwritec",NULL,0},
699 /* 0x21 */ { NULL, NULL, 0 },
700 /* 0x22 */ { "SMBsetattrE",reply_setattrE,AS_USER | NEED_WRITE },
701 /* 0x23 */ { "SMBgetattrE",reply_getattrE,AS_USER },
702 /* 0x24 */ { "SMBlockingX",reply_lockingX,AS_USER },
703 /* 0x25 */ { "SMBtrans",reply_trans,AS_USER | CAN_IPC },
704 /* 0x26 */ { "SMBtranss",NULL,AS_USER | CAN_IPC},
705 /* 0x27 */ { "SMBioctl",reply_ioctl,0},
706 /* 0x28 */ { "SMBioctls",NULL,AS_USER},
707 /* 0x29 */ { "SMBcopy",reply_copy,AS_USER | NEED_WRITE },
708 /* 0x2a */ { "SMBmove",NULL,AS_USER | NEED_WRITE },
709 /* 0x2b */ { "SMBecho",reply_echo,0},
710 /* 0x2c */ { "SMBwriteclose",reply_writeclose,AS_USER},
711 /* 0x2d */ { "SMBopenX",reply_open_and_X,AS_USER | CAN_IPC },
712 /* 0x2e */ { "SMBreadX",reply_read_and_X,AS_USER | CAN_IPC },
713 /* 0x2f */ { "SMBwriteX",reply_write_and_X,AS_USER | CAN_IPC },
714 /* 0x30 */ { NULL, NULL, 0 },
715 /* 0x31 */ { NULL, NULL, 0 },
716 /* 0x32 */ { "SMBtrans2", reply_trans2, AS_USER | CAN_IPC },
717 /* 0x33 */ { "SMBtranss2", reply_transs2, AS_USER},
718 /* 0x34 */ { "SMBfindclose", reply_findclose,AS_USER},
719 /* 0x35 */ { "SMBfindnclose", reply_findnclose, AS_USER},
720 /* 0x36 */ { NULL, NULL, 0 },
721 /* 0x37 */ { NULL, NULL, 0 },
722 /* 0x38 */ { NULL, NULL, 0 },
723 /* 0x39 */ { NULL, NULL, 0 },
724 /* 0x3a */ { NULL, NULL, 0 },
725 /* 0x3b */ { NULL, NULL, 0 },
726 /* 0x3c */ { NULL, NULL, 0 },
727 /* 0x3d */ { NULL, NULL, 0 },
728 /* 0x3e */ { NULL, NULL, 0 },
729 /* 0x3f */ { NULL, NULL, 0 },
730 /* 0x40 */ { NULL, NULL, 0 },
731 /* 0x41 */ { NULL, NULL, 0 },
732 /* 0x42 */ { NULL, NULL, 0 },
733 /* 0x43 */ { NULL, NULL, 0 },
734 /* 0x44 */ { NULL, NULL, 0 },
735 /* 0x45 */ { NULL, NULL, 0 },
736 /* 0x46 */ { NULL, NULL, 0 },
737 /* 0x47 */ { NULL, NULL, 0 },
738 /* 0x48 */ { NULL, NULL, 0 },
739 /* 0x49 */ { NULL, NULL, 0 },
740 /* 0x4a */ { NULL, NULL, 0 },
741 /* 0x4b */ { NULL, NULL, 0 },
742 /* 0x4c */ { NULL, NULL, 0 },
743 /* 0x4d */ { NULL, NULL, 0 },
744 /* 0x4e */ { NULL, NULL, 0 },
745 /* 0x4f */ { NULL, NULL, 0 },
746 /* 0x50 */ { NULL, NULL, 0 },
747 /* 0x51 */ { NULL, NULL, 0 },
748 /* 0x52 */ { NULL, NULL, 0 },
749 /* 0x53 */ { NULL, NULL, 0 },
750 /* 0x54 */ { NULL, NULL, 0 },
751 /* 0x55 */ { NULL, NULL, 0 },
752 /* 0x56 */ { NULL, NULL, 0 },
753 /* 0x57 */ { NULL, NULL, 0 },
754 /* 0x58 */ { NULL, NULL, 0 },
755 /* 0x59 */ { NULL, NULL, 0 },
756 /* 0x5a */ { NULL, NULL, 0 },
757 /* 0x5b */ { NULL, NULL, 0 },
758 /* 0x5c */ { NULL, NULL, 0 },
759 /* 0x5d */ { NULL, NULL, 0 },
760 /* 0x5e */ { NULL, NULL, 0 },
761 /* 0x5f */ { NULL, NULL, 0 },
762 /* 0x60 */ { NULL, NULL, 0 },
763 /* 0x61 */ { NULL, NULL, 0 },
764 /* 0x62 */ { NULL, NULL, 0 },
765 /* 0x63 */ { NULL, NULL, 0 },
766 /* 0x64 */ { NULL, NULL, 0 },
767 /* 0x65 */ { NULL, NULL, 0 },
768 /* 0x66 */ { NULL, NULL, 0 },
769 /* 0x67 */ { NULL, NULL, 0 },
770 /* 0x68 */ { NULL, NULL, 0 },
771 /* 0x69 */ { NULL, NULL, 0 },
772 /* 0x6a */ { NULL, NULL, 0 },
773 /* 0x6b */ { NULL, NULL, 0 },
774 /* 0x6c */ { NULL, NULL, 0 },
775 /* 0x6d */ { NULL, NULL, 0 },
776 /* 0x6e */ { NULL, NULL, 0 },
777 /* 0x6f */ { NULL, NULL, 0 },
778 /* 0x70 */ { "SMBtcon",reply_tcon,0},
779 /* 0x71 */ { "SMBtdis",reply_tdis,DO_CHDIR},
780 /* 0x72 */ { "SMBnegprot",reply_negprot,0},
781 /* 0x73 */ { "SMBsesssetupX",reply_sesssetup_and_X,0},
782 /* 0x74 */ { "SMBulogoffX", reply_ulogoffX, 0}, /* ulogoff doesn't give a valid TID */
783 /* 0x75 */ { "SMBtconX",reply_tcon_and_X,0},
784 /* 0x76 */ { NULL, NULL, 0 },
785 /* 0x77 */ { NULL, NULL, 0 },
786 /* 0x78 */ { NULL, NULL, 0 },
787 /* 0x79 */ { NULL, NULL, 0 },
788 /* 0x7a */ { NULL, NULL, 0 },
789 /* 0x7b */ { NULL, NULL, 0 },
790 /* 0x7c */ { NULL, NULL, 0 },
791 /* 0x7d */ { NULL, NULL, 0 },
792 /* 0x7e */ { NULL, NULL, 0 },
793 /* 0x7f */ { NULL, NULL, 0 },
794 /* 0x80 */ { "SMBdskattr",reply_dskattr,AS_USER},
795 /* 0x81 */ { "SMBsearch",reply_search,AS_USER},
796 /* 0x82 */ { "SMBffirst",reply_search,AS_USER},
797 /* 0x83 */ { "SMBfunique",reply_search,AS_USER},
798 /* 0x84 */ { "SMBfclose",reply_fclose,AS_USER},
799 /* 0x85 */ { NULL, NULL, 0 },
800 /* 0x86 */ { NULL, NULL, 0 },
801 /* 0x87 */ { NULL, NULL, 0 },
802 /* 0x88 */ { NULL, NULL, 0 },
803 /* 0x89 */ { NULL, NULL, 0 },
804 /* 0x8a */ { NULL, NULL, 0 },
805 /* 0x8b */ { NULL, NULL, 0 },
806 /* 0x8c */ { NULL, NULL, 0 },
807 /* 0x8d */ { NULL, NULL, 0 },
808 /* 0x8e */ { NULL, NULL, 0 },
809 /* 0x8f */ { NULL, NULL, 0 },
810 /* 0x90 */ { NULL, NULL, 0 },
811 /* 0x91 */ { NULL, NULL, 0 },
812 /* 0x92 */ { NULL, NULL, 0 },
813 /* 0x93 */ { NULL, NULL, 0 },
814 /* 0x94 */ { NULL, NULL, 0 },
815 /* 0x95 */ { NULL, NULL, 0 },
816 /* 0x96 */ { NULL, NULL, 0 },
817 /* 0x97 */ { NULL, NULL, 0 },
818 /* 0x98 */ { NULL, NULL, 0 },
819 /* 0x99 */ { NULL, NULL, 0 },
820 /* 0x9a */ { NULL, NULL, 0 },
821 /* 0x9b */ { NULL, NULL, 0 },
822 /* 0x9c */ { NULL, NULL, 0 },
823 /* 0x9d */ { NULL, NULL, 0 },
824 /* 0x9e */ { NULL, NULL, 0 },
825 /* 0x9f */ { NULL, NULL, 0 },
826 /* 0xa0 */ { "SMBnttrans", reply_nttrans, AS_USER | CAN_IPC },
827 /* 0xa1 */ { "SMBnttranss", reply_nttranss, AS_USER | CAN_IPC },
828 /* 0xa2 */ { "SMBntcreateX", reply_ntcreate_and_X, AS_USER | CAN_IPC },
829 /* 0xa3 */ { NULL, NULL, 0 },
830 /* 0xa4 */ { "SMBntcancel", reply_ntcancel, 0 },
831 /* 0xa5 */ { "SMBntrename", reply_ntrename, AS_USER | NEED_WRITE },
832 /* 0xa6 */ { NULL, NULL, 0 },
833 /* 0xa7 */ { NULL, NULL, 0 },
834 /* 0xa8 */ { NULL, NULL, 0 },
835 /* 0xa9 */ { NULL, NULL, 0 },
836 /* 0xaa */ { NULL, NULL, 0 },
837 /* 0xab */ { NULL, NULL, 0 },
838 /* 0xac */ { NULL, NULL, 0 },
839 /* 0xad */ { NULL, NULL, 0 },
840 /* 0xae */ { NULL, NULL, 0 },
841 /* 0xaf */ { NULL, NULL, 0 },
842 /* 0xb0 */ { NULL, NULL, 0 },
843 /* 0xb1 */ { NULL, NULL, 0 },
844 /* 0xb2 */ { NULL, NULL, 0 },
845 /* 0xb3 */ { NULL, NULL, 0 },
846 /* 0xb4 */ { NULL, NULL, 0 },
847 /* 0xb5 */ { NULL, NULL, 0 },
848 /* 0xb6 */ { NULL, NULL, 0 },
849 /* 0xb7 */ { NULL, NULL, 0 },
850 /* 0xb8 */ { NULL, NULL, 0 },
851 /* 0xb9 */ { NULL, NULL, 0 },
852 /* 0xba */ { NULL, NULL, 0 },
853 /* 0xbb */ { NULL, NULL, 0 },
854 /* 0xbc */ { NULL, NULL, 0 },
855 /* 0xbd */ { NULL, NULL, 0 },
856 /* 0xbe */ { NULL, NULL, 0 },
857 /* 0xbf */ { NULL, NULL, 0 },
858 /* 0xc0 */ { "SMBsplopen",reply_printopen,AS_USER},
859 /* 0xc1 */ { "SMBsplwr",reply_printwrite,AS_USER},
860 /* 0xc2 */ { "SMBsplclose",reply_printclose,AS_USER},
861 /* 0xc3 */ { "SMBsplretq",reply_printqueue,AS_USER},
862 /* 0xc4 */ { NULL, NULL, 0 },
863 /* 0xc5 */ { NULL, NULL, 0 },
864 /* 0xc6 */ { NULL, NULL, 0 },
865 /* 0xc7 */ { NULL, NULL, 0 },
866 /* 0xc8 */ { NULL, NULL, 0 },
867 /* 0xc9 */ { NULL, NULL, 0 },
868 /* 0xca */ { NULL, NULL, 0 },
869 /* 0xcb */ { NULL, NULL, 0 },
870 /* 0xcc */ { NULL, NULL, 0 },
871 /* 0xcd */ { NULL, NULL, 0 },
872 /* 0xce */ { NULL, NULL, 0 },
873 /* 0xcf */ { NULL, NULL, 0 },
874 /* 0xd0 */ { "SMBsends",reply_sends,AS_GUEST},
875 /* 0xd1 */ { "SMBsendb",NULL,AS_GUEST},
876 /* 0xd2 */ { "SMBfwdname",NULL,AS_GUEST},
877 /* 0xd3 */ { "SMBcancelf",NULL,AS_GUEST},
878 /* 0xd4 */ { "SMBgetmac",NULL,AS_GUEST},
879 /* 0xd5 */ { "SMBsendstrt",reply_sendstrt,AS_GUEST},
880 /* 0xd6 */ { "SMBsendend",reply_sendend,AS_GUEST},
881 /* 0xd7 */ { "SMBsendtxt",reply_sendtxt,AS_GUEST},
882 /* 0xd8 */ { NULL, NULL, 0 },
883 /* 0xd9 */ { NULL, NULL, 0 },
884 /* 0xda */ { NULL, NULL, 0 },
885 /* 0xdb */ { NULL, NULL, 0 },
886 /* 0xdc */ { NULL, NULL, 0 },
887 /* 0xdd */ { NULL, NULL, 0 },
888 /* 0xde */ { NULL, NULL, 0 },
889 /* 0xdf */ { NULL, NULL, 0 },
890 /* 0xe0 */ { NULL, NULL, 0 },
891 /* 0xe1 */ { NULL, NULL, 0 },
892 /* 0xe2 */ { NULL, NULL, 0 },
893 /* 0xe3 */ { NULL, NULL, 0 },
894 /* 0xe4 */ { NULL, NULL, 0 },
895 /* 0xe5 */ { NULL, NULL, 0 },
896 /* 0xe6 */ { NULL, NULL, 0 },
897 /* 0xe7 */ { NULL, NULL, 0 },
898 /* 0xe8 */ { NULL, NULL, 0 },
899 /* 0xe9 */ { NULL, NULL, 0 },
900 /* 0xea */ { NULL, NULL, 0 },
901 /* 0xeb */ { NULL, NULL, 0 },
902 /* 0xec */ { NULL, NULL, 0 },
903 /* 0xed */ { NULL, NULL, 0 },
904 /* 0xee */ { NULL, NULL, 0 },
905 /* 0xef */ { NULL, NULL, 0 },
906 /* 0xf0 */ { NULL, NULL, 0 },
907 /* 0xf1 */ { NULL, NULL, 0 },
908 /* 0xf2 */ { NULL, NULL, 0 },
909 /* 0xf3 */ { NULL, NULL, 0 },
910 /* 0xf4 */ { NULL, NULL, 0 },
911 /* 0xf5 */ { NULL, NULL, 0 },
912 /* 0xf6 */ { NULL, NULL, 0 },
913 /* 0xf7 */ { NULL, NULL, 0 },
914 /* 0xf8 */ { NULL, NULL, 0 },
915 /* 0xf9 */ { NULL, NULL, 0 },
916 /* 0xfa */ { NULL, NULL, 0 },
917 /* 0xfb */ { NULL, NULL, 0 },
918 /* 0xfc */ { NULL, NULL, 0 },
919 /* 0xfd */ { NULL, NULL, 0 },
920 /* 0xfe */ { NULL, NULL, 0 },
921 /* 0xff */ { NULL, NULL, 0 }
925 /*******************************************************************
926 Dump a packet to a file.
927 ********************************************************************/
929 static void smb_dump(const char *name, int type, char *data, ssize_t len)
933 if (DEBUGLEVEL < 50) return;
935 if (len < 4) len = smb_len(data)+4;
936 for (i=1;i<100;i++) {
937 slprintf(fname,sizeof(fname)-1, "/tmp/%s.%d.%s", name, i,
938 type ? "req" : "resp");
939 fd = open(fname, O_WRONLY|O_CREAT|O_EXCL, 0644);
940 if (fd != -1 || errno != EEXIST) break;
943 ssize_t ret = write(fd, data, len);
945 DEBUG(0,("smb_dump: problem: write returned %d\n", (int)ret ));
947 DEBUG(0,("created %s len %lu\n", fname, (unsigned long)len));
952 /****************************************************************************
953 Do a switch on the message type, and return the response size
954 ****************************************************************************/
956 static int switch_message(int type,char *inbuf,char *outbuf,int size,int bufsize)
958 static pid_t pid= (pid_t)-1;
963 if (pid == (pid_t)-1)
967 set_saved_ntstatus(NT_STATUS_OK);
971 /* Make sure this is an SMB packet. smb_size contains NetBIOS header so subtract 4 from it. */
972 if ((strncmp(smb_base(inbuf),"\377SMB",4) != 0) || (size < (smb_size - 4))) {
973 DEBUG(2,("Non-SMB packet of length %d. Terminating server\n",smb_len(inbuf)));
974 exit_server("Non-SMB packet");
978 /* yuck! this is an interim measure before we get rid of our
979 current inbuf/outbuf system */
980 global_smbpid = SVAL(inbuf,smb_pid);
982 if (smb_messages[type].fn == NULL) {
983 DEBUG(0,("Unknown message type %d!\n",type));
984 smb_dump("Unknown", 1, inbuf, size);
985 outsize = reply_unknown(inbuf,outbuf);
987 int flags = smb_messages[type].flags;
988 static uint16 last_session_tag = UID_FIELD_INVALID;
989 /* In share mode security we must ignore the vuid. */
990 uint16 session_tag = (lp_security() == SEC_SHARE) ? UID_FIELD_INVALID : SVAL(inbuf,smb_uid);
991 connection_struct *conn = conn_find(SVAL(inbuf,smb_tid));
993 DEBUG(3,("switch message %s (pid %d) conn 0x%lx\n",smb_fn_name(type),(int)pid,(unsigned long)conn));
995 smb_dump(smb_fn_name(type), 1, inbuf, size);
997 /* Ensure this value is replaced in the incoming packet. */
998 SSVAL(inbuf,smb_uid,session_tag);
1001 * Ensure the correct username is in current_user_info.
1002 * This is a really ugly bugfix for problems with
1003 * multiple session_setup_and_X's being done and
1004 * allowing %U and %G substitutions to work correctly.
1005 * There is a reason this code is done here, don't
1006 * move it unless you know what you're doing... :-).
1010 if (session_tag != last_session_tag) {
1011 user_struct *vuser = NULL;
1013 last_session_tag = session_tag;
1014 if(session_tag != UID_FIELD_INVALID)
1015 vuser = get_valid_user_struct(session_tag);
1017 set_current_user_info(&vuser->user);
1020 /* does this protocol need to be run as root? */
1021 if (!(flags & AS_USER))
1022 change_to_root_user();
1024 /* does this protocol need a valid tree connection? */
1025 if ((flags & AS_USER) && !conn) {
1026 /* Amazingly, the error code depends on the command (from Samba4). */
1027 if (type == SMBntcreateX) {
1028 return ERROR_NT(NT_STATUS_INVALID_HANDLE);
1030 return ERROR_DOS(ERRSRV, ERRinvnid);
1035 /* does this protocol need to be run as the connected user? */
1036 if ((flags & AS_USER) && !change_to_user(conn,session_tag)) {
1037 if (flags & AS_GUEST)
1040 return(ERROR_FORCE_DOS(ERRSRV,ERRbaduid));
1043 /* this code is to work around a bug is MS client 3 without
1044 introducing a security hole - it needs to be able to do
1045 print queue checks as guest if it isn't logged in properly */
1046 if (flags & AS_USER)
1049 /* does it need write permission? */
1050 if ((flags & NEED_WRITE) && !CAN_WRITE(conn))
1051 return(ERROR_DOS(ERRSRV,ERRaccess));
1053 /* ipc services are limited */
1054 if (IS_IPC(conn) && (flags & AS_USER) && !(flags & CAN_IPC))
1055 return(ERROR_DOS(ERRSRV,ERRaccess));
1057 /* load service specific parameters */
1059 if (!set_current_service(conn,SVAL(inbuf,smb_flg),(flags & (AS_USER|DO_CHDIR)?True:False))) {
1060 return(ERROR_DOS(ERRSRV,ERRaccess));
1062 conn->num_smb_operations++;
1065 /* does this protocol need to be run as guest? */
1066 if ((flags & AS_GUEST) && (!change_to_guest() ||
1067 !check_access(smbd_server_fd(), lp_hostsallow(-1), lp_hostsdeny(-1))))
1068 return(ERROR_DOS(ERRSRV,ERRaccess));
1070 current_inbuf = inbuf; /* In case we need to defer this message in open... */
1071 outsize = smb_messages[type].fn(conn, inbuf,outbuf,size,bufsize);
1074 smb_dump(smb_fn_name(type), 0, outbuf, outsize);
1080 /****************************************************************************
1081 Construct a reply to the incoming packet.
1082 ****************************************************************************/
1084 static int construct_reply(char *inbuf,char *outbuf,int size,int bufsize)
1086 int type = CVAL(inbuf,smb_com);
1088 int msg_type = CVAL(inbuf,0);
1090 GetTimeOfDay(&smb_last_time);
1097 return(reply_special(inbuf,outbuf));
1099 construct_reply_common(inbuf, outbuf);
1101 outsize = switch_message(type,inbuf,outbuf,size,bufsize);
1103 outsize += chain_size;
1106 smb_setlen(outbuf,outsize - 4);
1110 /****************************************************************************
1111 Keep track of the number of running smbd's. This functionality is used to
1112 'hard' limit Samba overhead on resource constrained systems.
1113 ****************************************************************************/
1115 static BOOL process_count_update_successful = False;
1117 static int32 increment_smbd_process_count(void)
1121 if (lp_max_smbd_processes()) {
1123 if (tdb_change_int32_atomic(conn_tdb_ctx(), "INFO/total_smbds", &total_smbds, 1) == -1)
1125 process_count_update_successful = True;
1126 return total_smbds + 1;
1131 void decrement_smbd_process_count(void)
1135 if (lp_max_smbd_processes() && process_count_update_successful) {
1137 tdb_change_int32_atomic(conn_tdb_ctx(), "INFO/total_smbds", &total_smbds, -1);
1141 static BOOL smbd_process_limit(void)
1145 if (lp_max_smbd_processes()) {
1147 /* Always add one to the smbd process count, as exit_server() always
1151 if (!conn_tdb_ctx()) {
1152 DEBUG(0,("smbd_process_limit: max smbd processes parameter set with status parameter not \
1153 set. Ignoring max smbd restriction.\n"));
1157 total_smbds = increment_smbd_process_count();
1158 return total_smbds > lp_max_smbd_processes();
1164 /****************************************************************************
1165 Process an smb from the client - split out from the smbd_process() code so
1166 it can be used by the oplock break code.
1167 ****************************************************************************/
1169 void process_smb(char *inbuf, char *outbuf)
1171 static int trans_num;
1172 int msg_type = CVAL(inbuf,0);
1173 int32 len = smb_len(inbuf);
1174 int nread = len + 4;
1176 DO_PROFILE_INC(smb_count);
1178 if (trans_num == 0) {
1179 /* on the first packet, check the global hosts allow/ hosts
1180 deny parameters before doing any parsing of the packet
1181 passed to us by the client. This prevents attacks on our
1182 parsing code from hosts not in the hosts allow list */
1183 if (smbd_process_limit() ||
1184 !check_access(smbd_server_fd(), lp_hostsallow(-1), lp_hostsdeny(-1))) {
1185 /* send a negative session response "not listening on calling name" */
1186 static unsigned char buf[5] = {0x83, 0, 0, 1, 0x81};
1187 DEBUG( 1, ( "Connection denied from %s\n", client_addr() ) );
1188 (void)send_smb(smbd_server_fd(),(char *)buf);
1189 exit_server("connection denied");
1193 DEBUG( 6, ( "got message type 0x%x of len 0x%x\n", msg_type, len ) );
1194 DEBUG( 3, ( "Transaction %d of length %d\n", trans_num, nread ) );
1198 else if(msg_type == SMBkeepalive)
1199 return; /* Keepalive packet. */
1201 nread = construct_reply(inbuf,outbuf,nread,max_send);
1204 if (CVAL(outbuf,0) == 0)
1207 if (nread != smb_len(outbuf) + 4) {
1208 DEBUG(0,("ERROR: Invalid message response size! %d %d\n",
1209 nread, smb_len(outbuf)));
1210 } else if (!send_smb(smbd_server_fd(),outbuf)) {
1211 exit_server("process_smb: send_smb failed.");
1217 /****************************************************************************
1218 Return a string containing the function name of a SMB command.
1219 ****************************************************************************/
1221 const char *smb_fn_name(int type)
1223 const char *unknown_name = "SMBunknown";
1225 if (smb_messages[type].name == NULL)
1226 return(unknown_name);
1228 return(smb_messages[type].name);
1231 /****************************************************************************
1232 Helper functions for contruct_reply.
1233 ****************************************************************************/
1235 static uint32 common_flags2 = FLAGS2_LONG_PATH_COMPONENTS|FLAGS2_32_BIT_ERROR_CODES;
1237 void add_to_common_flags2(uint32 v)
1242 void remove_from_common_flags2(uint32 v)
1244 common_flags2 &= ~v;
1247 void construct_reply_common(char *inbuf,char *outbuf)
1249 memset(outbuf,'\0',smb_size);
1251 set_message(outbuf,0,0,True);
1252 SCVAL(outbuf,smb_com,CVAL(inbuf,smb_com));
1254 memcpy(outbuf+4,inbuf+4,4);
1255 SCVAL(outbuf,smb_rcls,SMB_SUCCESS);
1256 SCVAL(outbuf,smb_reh,0);
1257 SCVAL(outbuf,smb_flg, FLAG_REPLY | (CVAL(inbuf,smb_flg) & FLAG_CASELESS_PATHNAMES));
1258 SSVAL(outbuf,smb_flg2,
1259 (SVAL(inbuf,smb_flg2) & FLAGS2_UNICODE_STRINGS) |
1262 SSVAL(outbuf,smb_err,SMB_SUCCESS);
1263 SSVAL(outbuf,smb_tid,SVAL(inbuf,smb_tid));
1264 SSVAL(outbuf,smb_pid,SVAL(inbuf,smb_pid));
1265 SSVAL(outbuf,smb_uid,SVAL(inbuf,smb_uid));
1266 SSVAL(outbuf,smb_mid,SVAL(inbuf,smb_mid));
1269 /****************************************************************************
1270 Construct a chained reply and add it to the already made reply
1271 ****************************************************************************/
1273 int chain_reply(char *inbuf,char *outbuf,int size,int bufsize)
1275 static char *orig_inbuf;
1276 static char *orig_outbuf;
1277 int smb_com1, smb_com2 = CVAL(inbuf,smb_vwv0);
1278 unsigned smb_off2 = SVAL(inbuf,smb_vwv1);
1279 char *inbuf2, *outbuf2;
1281 char inbuf_saved[smb_wct];
1282 char outbuf_saved[smb_wct];
1283 int outsize = smb_len(outbuf) + 4;
1285 /* maybe its not chained */
1286 if (smb_com2 == 0xFF) {
1287 SCVAL(outbuf,smb_vwv0,0xFF);
1291 if (chain_size == 0) {
1292 /* this is the first part of the chain */
1294 orig_outbuf = outbuf;
1298 * The original Win95 redirector dies on a reply to
1299 * a lockingX and read chain unless the chain reply is
1300 * 4 byte aligned. JRA.
1303 outsize = (outsize + 3) & ~3;
1305 /* we need to tell the client where the next part of the reply will be */
1306 SSVAL(outbuf,smb_vwv1,smb_offset(outbuf+outsize,outbuf));
1307 SCVAL(outbuf,smb_vwv0,smb_com2);
1309 /* remember how much the caller added to the chain, only counting stuff
1310 after the parameter words */
1311 chain_size += outsize - smb_wct;
1313 /* work out pointers into the original packets. The
1314 headers on these need to be filled in */
1315 inbuf2 = orig_inbuf + smb_off2 + 4 - smb_wct;
1316 outbuf2 = orig_outbuf + SVAL(outbuf,smb_vwv1) + 4 - smb_wct;
1318 /* remember the original command type */
1319 smb_com1 = CVAL(orig_inbuf,smb_com);
1321 /* save the data which will be overwritten by the new headers */
1322 memcpy(inbuf_saved,inbuf2,smb_wct);
1323 memcpy(outbuf_saved,outbuf2,smb_wct);
1325 /* give the new packet the same header as the last part of the SMB */
1326 memmove(inbuf2,inbuf,smb_wct);
1328 /* create the in buffer */
1329 SCVAL(inbuf2,smb_com,smb_com2);
1331 /* create the out buffer */
1332 construct_reply_common(inbuf2, outbuf2);
1334 DEBUG(3,("Chained message\n"));
1337 /* process the request */
1338 outsize2 = switch_message(smb_com2,inbuf2,outbuf2,size-chain_size,
1339 bufsize-chain_size);
1341 /* copy the new reply and request headers over the old ones, but
1342 preserve the smb_com field */
1343 memmove(orig_outbuf,outbuf2,smb_wct);
1344 SCVAL(orig_outbuf,smb_com,smb_com1);
1346 /* restore the saved data, being careful not to overwrite any
1347 data from the reply header */
1348 memcpy(inbuf2,inbuf_saved,smb_wct);
1351 int ofs = smb_wct - PTR_DIFF(outbuf2,orig_outbuf);
1352 if (ofs < 0) ofs = 0;
1353 memmove(outbuf2+ofs,outbuf_saved+ofs,smb_wct-ofs);
1359 /****************************************************************************
1360 Setup the needed select timeout.
1361 ****************************************************************************/
1363 static int setup_select_timeout(void)
1368 select_timeout = blocking_locks_timeout(SMBD_SELECT_TIMEOUT);
1369 select_timeout *= 1000;
1371 t = change_notify_timeout();
1372 DEBUG(10, ("change_notify_timeout: %d\n", t));
1374 select_timeout = MIN(select_timeout, t*1000);
1376 if (print_notify_messages_pending())
1377 select_timeout = MIN(select_timeout, 1000);
1379 return select_timeout;
1382 /****************************************************************************
1383 Check if services need reloading.
1384 ****************************************************************************/
1386 void check_reload(time_t t)
1388 static pid_t mypid = 0;
1389 static time_t last_smb_conf_reload_time = 0;
1390 static time_t last_printer_reload_time = 0;
1391 time_t printcap_cache_time = (time_t)lp_printcap_cache_time();
1393 if(last_smb_conf_reload_time == 0) {
1394 last_smb_conf_reload_time = t;
1395 /* Our printing subsystem might not be ready at smbd start up.
1396 Then no printer is available till the first printers check
1397 is performed. A lower initial interval circumvents this. */
1398 if ( printcap_cache_time > 60 )
1399 last_printer_reload_time = t - printcap_cache_time + 60;
1401 last_printer_reload_time = t;
1404 if (mypid != getpid()) { /* First time or fork happened meanwhile */
1405 /* randomize over 60 second the printcap reload to avoid all
1406 * process hitting cupsd at the same time */
1407 int time_range = 60;
1409 last_printer_reload_time += random() % time_range;
1413 if (reload_after_sighup || (t >= last_smb_conf_reload_time+SMBD_RELOAD_CHECK)) {
1414 reload_services(True);
1415 reload_after_sighup = False;
1416 last_smb_conf_reload_time = t;
1419 /* 'printcap cache time = 0' disable the feature */
1421 if ( printcap_cache_time != 0 )
1423 /* see if it's time to reload or if the clock has been set back */
1425 if ( (t >= last_printer_reload_time+printcap_cache_time)
1426 || (t-last_printer_reload_time < 0) )
1428 DEBUG( 3,( "Printcap cache time expired.\n"));
1430 last_printer_reload_time = t;
1435 /****************************************************************************
1436 Process any timeout housekeeping. Return False if the caller should exit.
1437 ****************************************************************************/
1439 static BOOL timeout_processing(int deadtime, int *select_timeout, time_t *last_timeout_processing_time)
1441 static time_t last_keepalive_sent_time = 0;
1442 static time_t last_idle_closed_check = 0;
1444 BOOL allidle = True;
1446 if (smb_read_error == READ_EOF) {
1447 DEBUG(3,("timeout_processing: End of file from client (client has disconnected).\n"));
1451 if (smb_read_error == READ_ERROR) {
1452 DEBUG(3,("timeout_processing: receive_smb error (%s) Exiting\n",
1457 if (smb_read_error == READ_BAD_SIG) {
1458 DEBUG(3,("timeout_processing: receive_smb error bad smb signature. Exiting\n"));
1462 *last_timeout_processing_time = t = time(NULL);
1464 if(last_keepalive_sent_time == 0)
1465 last_keepalive_sent_time = t;
1467 if(last_idle_closed_check == 0)
1468 last_idle_closed_check = t;
1470 /* become root again if waiting */
1471 change_to_root_user();
1473 /* run all registered idle events */
1474 smb_run_idle_events(t);
1476 /* check if we need to reload services */
1479 /* automatic timeout if all connections are closed */
1480 if (conn_num_open()==0 && (t - last_idle_closed_check) >= IDLE_CLOSED_TIMEOUT) {
1481 DEBUG( 2, ( "Closing idle connection\n" ) );
1484 last_idle_closed_check = t;
1487 if (keepalive && (t - last_keepalive_sent_time)>keepalive) {
1488 if (!send_keepalive(smbd_server_fd())) {
1489 DEBUG( 2, ( "Keepalive failed - exiting.\n" ) );
1493 /* send a keepalive for a password server or the like.
1494 This is attached to the auth_info created in the
1496 if (negprot_global_auth_context && negprot_global_auth_context->challenge_set_method
1497 && negprot_global_auth_context->challenge_set_method->send_keepalive) {
1499 negprot_global_auth_context->challenge_set_method->send_keepalive
1500 (&negprot_global_auth_context->challenge_set_method->private_data);
1503 last_keepalive_sent_time = t;
1506 /* check for connection timeouts */
1507 allidle = conn_idle_all(t, deadtime);
1509 if (allidle && conn_num_open()>0) {
1510 DEBUG(2,("Closing idle connection 2.\n"));
1514 if(global_machine_password_needs_changing &&
1515 /* for ADS we need to do a regular ADS password change, not a domain
1517 lp_security() == SEC_DOMAIN) {
1519 unsigned char trust_passwd_hash[16];
1523 * We're in domain level security, and the code that
1524 * read the machine password flagged that the machine
1525 * password needs changing.
1529 * First, open the machine password file with an exclusive lock.
1532 if (secrets_lock_trust_account_password(lp_workgroup(), True) == False) {
1533 DEBUG(0,("process: unable to lock the machine account password for \
1534 machine %s in domain %s.\n", global_myname(), lp_workgroup() ));
1538 if(!secrets_fetch_trust_account_password(lp_workgroup(), trust_passwd_hash, &lct, NULL)) {
1539 DEBUG(0,("process: unable to read the machine account password for \
1540 machine %s in domain %s.\n", global_myname(), lp_workgroup()));
1541 secrets_lock_trust_account_password(lp_workgroup(), False);
1546 * Make sure someone else hasn't already done this.
1549 if(t < lct + lp_machine_password_timeout()) {
1550 global_machine_password_needs_changing = False;
1551 secrets_lock_trust_account_password(lp_workgroup(), False);
1555 /* always just contact the PDC here */
1557 change_trust_account_password( lp_workgroup(), NULL);
1558 global_machine_password_needs_changing = False;
1559 secrets_lock_trust_account_password(lp_workgroup(), False);
1563 * Check to see if we have any blocking locks
1564 * outstanding on the queue.
1566 process_blocking_lock_queue(t);
1568 /* update printer queue caches if necessary */
1570 update_monitored_printq_cache();
1573 * Check to see if we have any change notifies
1574 * outstanding on the queue.
1576 process_pending_change_notify_queue(t);
1579 * Now we are root, check if the log files need pruning.
1580 * Force a log file check.
1582 force_check_log_size();
1585 /* Send any queued printer notify message to interested smbd's. */
1587 print_notify_send_messages(0);
1590 * Modify the select timeout depending upon
1591 * what we have remaining in our queues.
1594 *select_timeout = setup_select_timeout();
1599 /****************************************************************************
1600 Accessor functions for InBuffer, OutBuffer.
1601 ****************************************************************************/
1603 char *get_InBuffer(void)
1608 void set_InBuffer(char *new_inbuf)
1610 InBuffer = new_inbuf;
1611 current_inbuf = InBuffer;
1614 char *get_OutBuffer(void)
1619 void set_OutBuffer(char *new_outbuf)
1621 OutBuffer = new_outbuf;
1624 /****************************************************************************
1625 Free an InBuffer. Checks if not in use by aio system.
1626 Must have been allocated by NewInBuffer.
1627 ****************************************************************************/
1629 void free_InBuffer(char *inbuf)
1631 if (!aio_inbuffer_in_use(inbuf)) {
1632 if (current_inbuf == inbuf) {
1633 current_inbuf = NULL;
1639 /****************************************************************************
1640 Free an OutBuffer. No outbuffers currently stolen by aio system.
1641 Must have been allocated by NewInBuffer.
1642 ****************************************************************************/
1644 void free_OutBuffer(char *outbuf)
1649 const int total_buffer_size = (BUFFER_SIZE + LARGE_WRITEX_HDR_SIZE + SAFETY_MARGIN);
1651 /****************************************************************************
1652 Allocate a new InBuffer. Returns the new and old ones.
1653 ****************************************************************************/
1655 char *NewInBuffer(char **old_inbuf)
1657 char *new_inbuf = (char *)SMB_MALLOC(total_buffer_size);
1662 *old_inbuf = InBuffer;
1664 InBuffer = new_inbuf;
1665 #if defined(DEVELOPER)
1666 clobber_region(SAFE_STRING_FUNCTION_NAME, SAFE_STRING_LINE, InBuffer, total_buffer_size);
1671 /****************************************************************************
1672 Allocate a new OutBuffer. Returns the new and old ones.
1673 ****************************************************************************/
1675 char *NewOutBuffer(char **old_outbuf)
1677 char *new_outbuf = (char *)SMB_MALLOC(total_buffer_size);
1682 *old_outbuf = OutBuffer;
1684 OutBuffer = new_outbuf;
1685 #if defined(DEVELOPER)
1686 clobber_region(SAFE_STRING_FUNCTION_NAME, SAFE_STRING_LINE, OutBuffer, total_buffer_size);
1691 /****************************************************************************
1692 Process commands from the client
1693 ****************************************************************************/
1695 void smbd_process(void)
1697 time_t last_timeout_processing_time = time(NULL);
1698 unsigned int num_smbs = 0;
1700 /* Allocate the primary Inbut/Output buffers. */
1702 if ((NewInBuffer(NULL) == NULL) || (NewOutBuffer(NULL) == NULL))
1705 max_recv = MIN(lp_maxxmit(),BUFFER_SIZE);
1708 int deadtime = lp_deadtime()*60;
1709 int select_timeout = setup_select_timeout();
1713 deadtime = DEFAULT_SMBD_TIMEOUT;
1717 /* free up temporary memory */
1719 main_loop_talloc_free();
1721 /* Did someone ask for immediate checks on things like blocking locks ? */
1722 if (select_timeout == 0) {
1723 if(!timeout_processing( deadtime, &select_timeout, &last_timeout_processing_time))
1725 num_smbs = 0; /* Reset smb counter. */
1730 #if defined(DEVELOPER)
1731 clobber_region(SAFE_STRING_FUNCTION_NAME, SAFE_STRING_LINE, InBuffer, total_buffer_size);
1734 while (!receive_message_or_smb(InBuffer,BUFFER_SIZE+LARGE_WRITEX_HDR_SIZE,select_timeout)) {
1735 if(!timeout_processing( deadtime, &select_timeout, &last_timeout_processing_time))
1737 num_smbs = 0; /* Reset smb counter. */
1741 * Ensure we do timeout processing if the SMB we just got was
1742 * only an echo request. This allows us to set the select
1743 * timeout in 'receive_message_or_smb()' to any value we like
1744 * without worrying that the client will send echo requests
1745 * faster than the select timeout, thus starving out the
1746 * essential processing (change notify, blocking locks) that
1747 * the timeout code does. JRA.
1749 num_echos = smb_echo_count;
1751 clobber_region(SAFE_STRING_FUNCTION_NAME, SAFE_STRING_LINE, OutBuffer, total_buffer_size);
1753 process_smb(InBuffer, OutBuffer);
1755 if (smb_echo_count != num_echos) {
1756 if(!timeout_processing( deadtime, &select_timeout, &last_timeout_processing_time))
1758 num_smbs = 0; /* Reset smb counter. */
1764 * If we are getting smb requests in a constant stream
1765 * with no echos, make sure we attempt timeout processing
1766 * every select_timeout milliseconds - but only check for this
1767 * every 200 smb requests.
1770 if ((num_smbs % 200) == 0) {
1771 time_t new_check_time = time(NULL);
1772 if(new_check_time - last_timeout_processing_time >= (select_timeout/1000)) {
1773 if(!timeout_processing( deadtime, &select_timeout, &last_timeout_processing_time))
1775 num_smbs = 0; /* Reset smb counter. */
1776 last_timeout_processing_time = new_check_time; /* Reset time. */
1780 /* The timeout_processing function isn't run nearly
1781 often enough to implement 'max log size' without
1782 overrunning the size of the file by many megabytes.
1783 This is especially true if we are running at debug
1784 level 10. Checking every 50 SMBs is a nice
1785 tradeoff of performance vs log file size overrun. */
1787 if ((num_smbs % 50) == 0 && need_to_check_log_size()) {
1788 change_to_root_user();