source: branches/samba-3.2.x/source/smbd/process.c@ 205

Last change on this file since 205 was 204, checked in by Herwig Bauernfeind, 16 years ago

Update 3.2 branch to 3.2.4
File size: 60.1 KB
Line 
1/*
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
6
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.
11
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.
16
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/>.
19*/
20
21#include "includes.h"
22
23extern int smb_echo_count;
24
25/*
26 * Size of data we can send to client. Set
27 * by the client for all protocols above CORE.
28 * Set by us for CORE protocol.
29 */
30int max_send = BUFFER_SIZE;
31/*
32 * Size of the data we can receive. Set by us.
33 * Can be modified by the max xmit parameter.
34 */
35int max_recv = BUFFER_SIZE;
36
37SIG_ATOMIC_T reload_after_sighup = 0;
38SIG_ATOMIC_T got_sig_term = 0;
39extern bool global_machine_password_needs_changing;
40extern int max_send;
41
42/* Accessor function for smb_read_error for smbd functions. */
43
44/****************************************************************************
45 Send an smb to a fd.
46****************************************************************************/
47
48bool srv_send_smb(int fd, char *buffer, bool do_encrypt)
49{
50 size_t len;
51 size_t nwritten=0;
52 ssize_t ret;
53 char *buf_out = buffer;
54
55 /* Sign the outgoing packet if required. */
56 srv_calculate_sign_mac(buf_out);
57
58 if (do_encrypt) {
59 NTSTATUS status = srv_encrypt_buffer(buffer, &buf_out);
60 if (!NT_STATUS_IS_OK(status)) {
61 DEBUG(0, ("send_smb: SMB encryption failed "
62 "on outgoing packet! Error %s\n",
63 nt_errstr(status) ));
64 return false;
65 }
66 }
67
68 len = smb_len(buf_out) + 4;
69
70 while (nwritten < len) {
71 ret = write_data(fd,buf_out+nwritten,len - nwritten);
72 if (ret <= 0) {
73 DEBUG(0,("Error writing %d bytes to client. %d. (%s)\n",
74 (int)len,(int)ret, strerror(errno) ));
75 srv_free_enc_buffer(buf_out);
76 return false;
77 }
78 nwritten += ret;
79 }
80
81 srv_free_enc_buffer(buf_out);
82 return true;
83}
84
85/*******************************************************************
86 Setup the word count and byte count for a smb message.
87********************************************************************/
88
89int srv_set_message(char *buf,
90 int num_words,
91 int num_bytes,
92 bool zero)
93{
94 if (zero && (num_words || num_bytes)) {
95 memset(buf + smb_size,'\0',num_words*2 + num_bytes);
96 }
97 SCVAL(buf,smb_wct,num_words);
98 SSVAL(buf,smb_vwv + num_words*SIZEOFWORD,num_bytes);
99 smb_setlen(buf,(smb_size + num_words*2 + num_bytes - 4));
100 return (smb_size + num_words*2 + num_bytes);
101}
102
103static bool valid_smb_header(const uint8_t *inbuf)
104{
105 if (is_encrypted_packet(inbuf)) {
106 return true;
107 }
108 return (strncmp(smb_base(inbuf),"\377SMB",4) == 0);
109}
110
111/* Socket functions for smbd packet processing. */
112
113static bool valid_packet_size(size_t len)
114{
115 /*
116 * A WRITEX with CAP_LARGE_WRITEX can be 64k worth of data plus 65 bytes
117 * of header. Don't print the error if this fits.... JRA.
118 */
119
120 if (len > (BUFFER_SIZE + LARGE_WRITEX_HDR_SIZE)) {
121 DEBUG(0,("Invalid packet length! (%lu bytes).\n",
122 (unsigned long)len));
123 return false;
124 }
125 return true;
126}
127
128static NTSTATUS read_packet_remainder(int fd, char *buffer,
129 unsigned int timeout, ssize_t len)
130{
131 if (len <= 0) {
132 return NT_STATUS_OK;
133 }
134
135 return read_socket_with_timeout(fd, buffer, len, len, timeout, NULL);
136}
137
138/****************************************************************************
139 Attempt a zerocopy writeX read. We know here that len > smb_size-4
140****************************************************************************/
141
142/*
143 * Unfortunately, earlier versions of smbclient/libsmbclient
144 * don't send this "standard" writeX header. I've fixed this
145 * for 3.2 but we'll use the old method with earlier versions.
146 * Windows and CIFSFS at least use this standard size. Not
147 * sure about MacOSX.
148 */
149
150#define STANDARD_WRITE_AND_X_HEADER_SIZE (smb_size - 4 + /* basic header */ \
151 (2*14) + /* word count (including bcc) */ \
152 1 /* pad byte */)
153
154static NTSTATUS receive_smb_raw_talloc_partial_read(TALLOC_CTX *mem_ctx,
155 const char lenbuf[4],
156 int fd, char **buffer,
157 unsigned int timeout,
158 size_t *p_unread,
159 size_t *len_ret)
160{
161 /* Size of a WRITEX call (+4 byte len). */
162 char writeX_header[4 + STANDARD_WRITE_AND_X_HEADER_SIZE];
163 ssize_t len = smb_len_large(lenbuf); /* Could be a UNIX large writeX. */
164 ssize_t toread;
165 NTSTATUS status;
166
167 memcpy(writeX_header, lenbuf, 4);
168
169 status = read_socket_with_timeout(
170 fd, writeX_header + 4,
171 STANDARD_WRITE_AND_X_HEADER_SIZE,
172 STANDARD_WRITE_AND_X_HEADER_SIZE,
173 timeout, NULL);
174
175 if (!NT_STATUS_IS_OK(status)) {
176 return status;
177 }
178
179 /*
180 * Ok - now try and see if this is a possible
181 * valid writeX call.
182 */
183
184 if (is_valid_writeX_buffer((uint8_t *)writeX_header)) {
185 /*
186 * If the data offset is beyond what
187 * we've read, drain the extra bytes.
188 */
189 uint16_t doff = SVAL(writeX_header,smb_vwv11);
190 ssize_t newlen;
191
192 if (doff > STANDARD_WRITE_AND_X_HEADER_SIZE) {
193 size_t drain = doff - STANDARD_WRITE_AND_X_HEADER_SIZE;
194 if (drain_socket(smbd_server_fd(), drain) != drain) {
195 smb_panic("receive_smb_raw_talloc_partial_read:"
196 " failed to drain pending bytes");
197 }
198 } else {
199 doff = STANDARD_WRITE_AND_X_HEADER_SIZE;
200 }
201
202 /* Spoof down the length and null out the bcc. */
203 set_message_bcc(writeX_header, 0);
204 newlen = smb_len(writeX_header);
205
206 /* Copy the header we've written. */
207
208 *buffer = (char *)TALLOC_MEMDUP(mem_ctx,
209 writeX_header,
210 sizeof(writeX_header));
211
212 if (*buffer == NULL) {
213 DEBUG(0, ("Could not allocate inbuf of length %d\n",
214 (int)sizeof(writeX_header)));
215 return NT_STATUS_NO_MEMORY;
216 }
217
218 /* Work out the remaining bytes. */
219 *p_unread = len - STANDARD_WRITE_AND_X_HEADER_SIZE;
220 *len_ret = newlen + 4;
221 return NT_STATUS_OK;
222 }
223
224 if (!valid_packet_size(len)) {
225 return NT_STATUS_INVALID_PARAMETER;
226 }
227
228 /*
229 * Not a valid writeX call. Just do the standard
230 * talloc and return.
231 */
232
233 *buffer = TALLOC_ARRAY(mem_ctx, char, len+4);
234
235 if (*buffer == NULL) {
236 DEBUG(0, ("Could not allocate inbuf of length %d\n",
237 (int)len+4));
238 return NT_STATUS_NO_MEMORY;
239 }
240
241 /* Copy in what we already read. */
242 memcpy(*buffer,
243 writeX_header,
244 4 + STANDARD_WRITE_AND_X_HEADER_SIZE);
245 toread = len - STANDARD_WRITE_AND_X_HEADER_SIZE;
246
247 if(toread > 0) {
248 status = read_packet_remainder(
249 fd, (*buffer) + 4 + STANDARD_WRITE_AND_X_HEADER_SIZE,
250 timeout, toread);
251
252 if (!NT_STATUS_IS_OK(status)) {
253 DEBUG(10, ("receive_smb_raw_talloc_partial_read: %s\n",
254 nt_errstr(status)));
255 return status;
256 }
257 }
258
259 *len_ret = len + 4;
260 return NT_STATUS_OK;
261}
262
263static NTSTATUS receive_smb_raw_talloc(TALLOC_CTX *mem_ctx, int fd,
264 char **buffer, unsigned int timeout,
265 size_t *p_unread, size_t *plen)
266{
267 char lenbuf[4];
268 size_t len;
269 int min_recv_size = lp_min_receive_file_size();
270 NTSTATUS status;
271
272 *p_unread = 0;
273
274 status = read_smb_length_return_keepalive(fd, lenbuf, timeout, &len);
275 if (!NT_STATUS_IS_OK(status)) {
276 DEBUG(10, ("receive_smb_raw: %s\n", nt_errstr(status)));
277 return status;
278 }
279
280 if (CVAL(lenbuf,0) == 0 &&
281 min_recv_size &&
282 smb_len_large(lenbuf) > min_recv_size && /* Could be a UNIX large writeX. */
283 !srv_is_signing_active()) {
284
285 return receive_smb_raw_talloc_partial_read(
286 mem_ctx, lenbuf, fd, buffer, timeout, p_unread, plen);
287 }
288
289 if (!valid_packet_size(len)) {
290 return NT_STATUS_INVALID_PARAMETER;
291 }
292
293 /*
294 * The +4 here can't wrap, we've checked the length above already.
295 */
296
297 *buffer = TALLOC_ARRAY(mem_ctx, char, len+4);
298
299 if (*buffer == NULL) {
300 DEBUG(0, ("Could not allocate inbuf of length %d\n",
301 (int)len+4));
302 return NT_STATUS_NO_MEMORY;
303 }
304
305 memcpy(*buffer, lenbuf, sizeof(lenbuf));
306
307 status = read_packet_remainder(fd, (*buffer)+4, timeout, len);
308 if (!NT_STATUS_IS_OK(status)) {
309 return status;
310 }
311
312 *plen = len + 4;
313 return NT_STATUS_OK;
314}
315
316static NTSTATUS receive_smb_talloc(TALLOC_CTX *mem_ctx, int fd,
317 char **buffer, unsigned int timeout,
318 size_t *p_unread, bool *p_encrypted,
319 size_t *p_len)
320{
321 size_t len = 0;
322 NTSTATUS status;
323
324 *p_encrypted = false;
325
326 status = receive_smb_raw_talloc(mem_ctx, fd, buffer, timeout,
327 p_unread, &len);
328 if (!NT_STATUS_IS_OK(status)) {
329 return status;
330 }
331
332 if (is_encrypted_packet((uint8_t *)*buffer)) {
333 status = srv_decrypt_buffer(*buffer);
334 if (!NT_STATUS_IS_OK(status)) {
335 DEBUG(0, ("receive_smb_talloc: SMB decryption failed on "
336 "incoming packet! Error %s\n",
337 nt_errstr(status) ));
338 return status;
339 }
340 *p_encrypted = true;
341 }
342
343 /* Check the incoming SMB signature. */
344 if (!srv_check_sign_mac(*buffer, true)) {
345 DEBUG(0, ("receive_smb: SMB Signature verification failed on "
346 "incoming packet!\n"));
347 return NT_STATUS_INVALID_NETWORK_RESPONSE;
348 }
349
350 *p_len = len;
351 return NT_STATUS_OK;
352}
353
354/*
355 * Initialize a struct smb_request from an inbuf
356 */
357
358void init_smb_request(struct smb_request *req,
359 const uint8 *inbuf,
360 size_t unread_bytes,
361 bool encrypted)
362{
363 size_t req_size = smb_len(inbuf) + 4;
364 /* Ensure we have at least smb_size bytes. */
365 if (req_size < smb_size) {
366 DEBUG(0,("init_smb_request: invalid request size %u\n",
367 (unsigned int)req_size ));
368 exit_server_cleanly("Invalid SMB request");
369 }
370 req->flags2 = SVAL(inbuf, smb_flg2);
371 req->smbpid = SVAL(inbuf, smb_pid);
372 req->mid = SVAL(inbuf, smb_mid);
373 req->vuid = SVAL(inbuf, smb_uid);
374 req->tid = SVAL(inbuf, smb_tid);
375 req->wct = CVAL(inbuf, smb_wct);
376 req->unread_bytes = unread_bytes;
377 req->encrypted = encrypted;
378 req->conn = conn_find(req->tid);
379
380 /* Ensure we have at least wct words and 2 bytes of bcc. */
381 if (smb_size + req->wct*2 > req_size) {
382 DEBUG(0,("init_smb_request: invalid wct number %u (size %u)\n",
383 (unsigned int)req->wct,
384 (unsigned int)req_size));
385 exit_server_cleanly("Invalid SMB request");
386 }
387 /* Ensure bcc is correct. */
388 if (((uint8 *)smb_buf(inbuf)) + smb_buflen(inbuf) > inbuf + req_size) {
389 DEBUG(0,("init_smb_request: invalid bcc number %u "
390 "(wct = %u, size %u)\n",
391 (unsigned int)smb_buflen(inbuf),
392 (unsigned int)req->wct,
393 (unsigned int)req_size));
394 exit_server_cleanly("Invalid SMB request");
395 }
396 req->inbuf = inbuf;
397 req->outbuf = NULL;
398}
399
400/****************************************************************************
401 structure to hold a linked list of queued messages.
402 for processing.
403****************************************************************************/
404
405static struct pending_message_list *deferred_open_queue;
406
407/****************************************************************************
408 Function to push a message onto the tail of a linked list of smb messages ready
409 for processing.
410****************************************************************************/
411
412static bool push_queued_message(struct smb_request *req,
413 struct timeval request_time,
414 struct timeval end_time,
415 char *private_data, size_t private_len)
416{
417 int msg_len = smb_len(req->inbuf) + 4;
418 struct pending_message_list *msg;
419
420 msg = TALLOC_ZERO_P(NULL, struct pending_message_list);
421
422 if(msg == NULL) {
423 DEBUG(0,("push_message: malloc fail (1)\n"));
424 return False;
425 }
426
427 msg->buf = data_blob_talloc(msg, req->inbuf, msg_len);
428 if(msg->buf.data == NULL) {
429 DEBUG(0,("push_message: malloc fail (2)\n"));
430 TALLOC_FREE(msg);
431 return False;
432 }
433
434 msg->request_time = request_time;
435 msg->end_time = end_time;
436 msg->encrypted = req->encrypted;
437
438 if (private_data) {
439 msg->private_data = data_blob_talloc(msg, private_data,
440 private_len);
441 if (msg->private_data.data == NULL) {
442 DEBUG(0,("push_message: malloc fail (3)\n"));
443 TALLOC_FREE(msg);
444 return False;
445 }
446 }
447
448 DLIST_ADD_END(deferred_open_queue, msg, struct pending_message_list *);
449
450 DEBUG(10,("push_message: pushed message length %u on "
451 "deferred_open_queue\n", (unsigned int)msg_len));
452
453 return True;
454}
455
456/****************************************************************************
457 Function to delete a sharing violation open message by mid.
458****************************************************************************/
459
460void remove_deferred_open_smb_message(uint16 mid)
461{
462 struct pending_message_list *pml;
463
464 for (pml = deferred_open_queue; pml; pml = pml->next) {
465 if (mid == SVAL(pml->buf.data,smb_mid)) {
466 DEBUG(10,("remove_sharing_violation_open_smb_message: "
467 "deleting mid %u len %u\n",
468 (unsigned int)mid,
469 (unsigned int)pml->buf.length ));
470 DLIST_REMOVE(deferred_open_queue, pml);
471 TALLOC_FREE(pml);
472 return;
473 }
474 }
475}
476
477/****************************************************************************
478 Move a sharing violation open retry message to the front of the list and
479 schedule it for immediate processing.
480****************************************************************************/
481
482void schedule_deferred_open_smb_message(uint16 mid)
483{
484 struct pending_message_list *pml;
485 int i = 0;
486
487 for (pml = deferred_open_queue; pml; pml = pml->next) {
488 uint16 msg_mid = SVAL(pml->buf.data,smb_mid);
489 DEBUG(10,("schedule_deferred_open_smb_message: [%d] msg_mid = %u\n", i++,
490 (unsigned int)msg_mid ));
491 if (mid == msg_mid) {
492 DEBUG(10,("schedule_deferred_open_smb_message: scheduling mid %u\n",
493 mid ));
494 pml->end_time.tv_sec = 0;
495 pml->end_time.tv_usec = 0;
496 DLIST_PROMOTE(deferred_open_queue, pml);
497 return;
498 }
499 }
500
501 DEBUG(10,("schedule_deferred_open_smb_message: failed to find message mid %u\n",
502 mid ));
503}
504
505/****************************************************************************
506 Return true if this mid is on the deferred queue.
507****************************************************************************/
508
509bool open_was_deferred(uint16 mid)
510{
511 struct pending_message_list *pml;
512
513 for (pml = deferred_open_queue; pml; pml = pml->next) {
514 if (SVAL(pml->buf.data,smb_mid) == mid) {
515 return True;
516 }
517 }
518 return False;
519}
520
521/****************************************************************************
522 Return the message queued by this mid.
523****************************************************************************/
524
525struct pending_message_list *get_open_deferred_message(uint16 mid)
526{
527 struct pending_message_list *pml;
528
529 for (pml = deferred_open_queue; pml; pml = pml->next) {
530 if (SVAL(pml->buf.data,smb_mid) == mid) {
531 return pml;
532 }
533 }
534 return NULL;
535}
536
537/****************************************************************************
538 Function to push a deferred open smb message onto a linked list of local smb
539 messages ready for processing.
540****************************************************************************/
541
542bool push_deferred_smb_message(struct smb_request *req,
543 struct timeval request_time,
544 struct timeval timeout,
545 char *private_data, size_t priv_len)
546{
547 struct timeval end_time;
548
549 if (req->unread_bytes) {
550 DEBUG(0,("push_deferred_smb_message: logic error ! "
551 "unread_bytes = %u\n",
552 (unsigned int)req->unread_bytes ));
553 smb_panic("push_deferred_smb_message: "
554 "logic error unread_bytes != 0" );
555 }
556
557 end_time = timeval_sum(&request_time, &timeout);
558
559 DEBUG(10,("push_deferred_open_smb_message: pushing message len %u mid %u "
560 "timeout time [%u.%06u]\n",
561 (unsigned int) smb_len(req->inbuf)+4, (unsigned int)req->mid,
562 (unsigned int)end_time.tv_sec,
563 (unsigned int)end_time.tv_usec));
564
565 return push_queued_message(req, request_time, end_time,
566 private_data, priv_len);
567}
568
569struct idle_event {
570 struct timed_event *te;
571 struct timeval interval;
572 char *name;
573 bool (*handler)(const struct timeval *now, void *private_data);
574 void *private_data;
575};
576
577static void idle_event_handler(struct event_context *ctx,
578 struct timed_event *te,
579 const struct timeval *now,
580 void *private_data)
581{
582 struct idle_event *event =
583 talloc_get_type_abort(private_data, struct idle_event);
584
585 TALLOC_FREE(event->te);
586
587 if (!event->handler(now, event->private_data)) {
588 /* Don't repeat, delete ourselves */
589 TALLOC_FREE(event);
590 return;
591 }
592
593 event->te = event_add_timed(ctx, event,
594 timeval_sum(now, &event->interval),
595 event->name,
596 idle_event_handler, event);
597
598 /* We can't do much but fail here. */
599 SMB_ASSERT(event->te != NULL);
600}
601
602struct idle_event *event_add_idle(struct event_context *event_ctx,
603 TALLOC_CTX *mem_ctx,
604 struct timeval interval,
605 const char *name,
606 bool (*handler)(const struct timeval *now,
607 void *private_data),
608 void *private_data)
609{
610 struct idle_event *result;
611 struct timeval now = timeval_current();
612
613 result = TALLOC_P(mem_ctx, struct idle_event);
614 if (result == NULL) {
615 DEBUG(0, ("talloc failed\n"));
616 return NULL;
617 }
618
619 result->interval = interval;
620 result->handler = handler;
621 result->private_data = private_data;
622
623 if (!(result->name = talloc_asprintf(result, "idle_evt(%s)", name))) {
624 DEBUG(0, ("talloc failed\n"));
625 TALLOC_FREE(result);
626 return NULL;
627 }
628
629 result->te = event_add_timed(event_ctx, result,
630 timeval_sum(&now, &interval),
631 result->name,
632 idle_event_handler, result);
633 if (result->te == NULL) {
634 DEBUG(0, ("event_add_timed failed\n"));
635 TALLOC_FREE(result);
636 return NULL;
637 }
638
639 return result;
640}
641
642/****************************************************************************
643 Do all async processing in here. This includes kernel oplock messages, change
644 notify events etc.
645****************************************************************************/
646
647static void async_processing(fd_set *pfds)
648{
649 DEBUG(10,("async_processing: Doing async processing.\n"));
650
651 process_aio_queue();
652
653 process_kernel_oplocks(smbd_messaging_context(), pfds);
654
655 /* Do the aio check again after receive_local_message as it does a
656 select and may have eaten our signal. */
657 /* Is this till true? -- vl */
658 process_aio_queue();
659
660 if (got_sig_term) {
661 exit_server_cleanly("termination signal");
662 }
663
664 /* check for sighup processing */
665 if (reload_after_sighup) {
666 change_to_root_user();
667 DEBUG(1,("Reloading services after SIGHUP\n"));
668 reload_services(False);
669 reload_after_sighup = 0;
670 }
671}
672
673/****************************************************************************
674 Add a fd to the set we will be select(2)ing on.
675****************************************************************************/
676
677static int select_on_fd(int fd, int maxfd, fd_set *fds)
678{
679 if (fd != -1) {
680 FD_SET(fd, fds);
681 maxfd = MAX(maxfd, fd);
682 }
683
684 return maxfd;
685}
686
687/****************************************************************************
688 Do a select on an two fd's - with timeout.
689
690 If a local udp message has been pushed onto the
691 queue (this can only happen during oplock break
692 processing) call async_processing()
693
694 If a pending smb message has been pushed onto the
695 queue (this can only happen during oplock break
696 processing) return this next.
697
698 If the first smbfd is ready then read an smb from it.
699 if the second (loopback UDP) fd is ready then read a message
700 from it and setup the buffer header to identify the length
701 and from address.
702 Returns False on timeout or error.
703 Else returns True.
704
705The timeout is in milliseconds
706****************************************************************************/
707
708static NTSTATUS receive_message_or_smb(TALLOC_CTX *mem_ctx, char **buffer,
709 size_t *buffer_len, int timeout,
710 size_t *p_unread, bool *p_encrypted)
711{
712 fd_set r_fds, w_fds;
713 int selrtn;
714 struct timeval to;
715 int maxfd = 0;
716 size_t len = 0;
717 NTSTATUS status;
718
719 *p_unread = 0;
720
721 again:
722
723 if (timeout >= 0) {
724 to.tv_sec = timeout / 1000;
725 to.tv_usec = (timeout % 1000) * 1000;
726 } else {
727 to.tv_sec = SMBD_SELECT_TIMEOUT;
728 to.tv_usec = 0;
729 }
730
731 /*
732 * Note that this call must be before processing any SMB
733 * messages as we need to synchronously process any messages
734 * we may have sent to ourselves from the previous SMB.
735 */
736 message_dispatch(smbd_messaging_context());
737
738 /*
739 * Check to see if we already have a message on the deferred open queue
740 * and it's time to schedule.
741 */
742 if(deferred_open_queue != NULL) {
743 bool pop_message = False;
744 struct pending_message_list *msg = deferred_open_queue;
745
746 if (timeval_is_zero(&msg->end_time)) {
747 pop_message = True;
748 } else {
749 struct timeval tv;
750 SMB_BIG_INT tdif;
751
752 GetTimeOfDay(&tv);
753 tdif = usec_time_diff(&msg->end_time, &tv);
754 if (tdif <= 0) {
755 /* Timed out. Schedule...*/
756 pop_message = True;
757 DEBUG(10,("receive_message_or_smb: queued message timed out.\n"));
758 } else {
759 /* Make a more accurate select timeout. */
760 to.tv_sec = tdif / 1000000;
761 to.tv_usec = tdif % 1000000;
762 DEBUG(10,("receive_message_or_smb: select with timeout of [%u.%06u]\n",
763 (unsigned int)to.tv_sec, (unsigned int)to.tv_usec ));
764 }
765 }
766
767 if (pop_message) {
768
769 *buffer = (char *)talloc_memdup(mem_ctx, msg->buf.data,
770 msg->buf.length);
771 if (*buffer == NULL) {
772 DEBUG(0, ("talloc failed\n"));
773 return NT_STATUS_NO_MEMORY;
774 }
775 *buffer_len = msg->buf.length;
776 *p_encrypted = msg->encrypted;
777
778 /* We leave this message on the queue so the open code can
779 know this is a retry. */
780 DEBUG(5,("receive_message_or_smb: returning deferred open smb message.\n"));
781 return NT_STATUS_OK;
782 }
783 }
784
785 /*
786 * Setup the select fd sets.
787 */
788
789 FD_ZERO(&r_fds);
790 FD_ZERO(&w_fds);
791
792 /*
793 * Ensure we process oplock break messages by preference.
794 * We have to do this before the select, after the select
795 * and if the select returns EINTR. This is due to the fact
796 * that the selects called from async_processing can eat an EINTR
797 * caused by a signal (we can't take the break message there).
798 * This is hideously complex - *MUST* be simplified for 3.0 ! JRA.
799 */
800
801 if (oplock_message_waiting(&r_fds)) {
802 DEBUG(10,("receive_message_or_smb: oplock_message is waiting.\n"));
803 async_processing(&r_fds);
804 /*
805 * After async processing we must go and do the select again, as
806 * the state of the flag in fds for the server file descriptor is
807 * indeterminate - we may have done I/O on it in the oplock processing. JRA.
808 */
809 goto again;
810 }
811
812 /*
813 * Are there any timed events waiting ? If so, ensure we don't
814 * select for longer than it would take to wait for them.
815 */
816
817 {
818 struct timeval now;
819 GetTimeOfDay(&now);
820
821 event_add_to_select_args(smbd_event_context(), &now,
822 &r_fds, &w_fds, &to, &maxfd);
823 }
824
825 if (timeval_is_zero(&to)) {
826 /* Process a timed event now... */
827 if (run_events(smbd_event_context(), 0, NULL, NULL)) {
828 goto again;
829 }
830 }
831
832 {
833 int sav;
834 START_PROFILE(smbd_idle);
835
836 maxfd = select_on_fd(smbd_server_fd(), maxfd, &r_fds);
837 maxfd = select_on_fd(oplock_notify_fd(), maxfd, &r_fds);
838
839 selrtn = sys_select(maxfd+1,&r_fds,&w_fds,NULL,&to);
840 sav = errno;
841
842 END_PROFILE(smbd_idle);
843 errno = sav;
844 }
845
846 if (run_events(smbd_event_context(), selrtn, &r_fds, &w_fds)) {
847 goto again;
848 }
849
850 /* if we get EINTR then maybe we have received an oplock
851 signal - treat this as select returning 1. This is ugly, but
852 is the best we can do until the oplock code knows more about
853 signals */
854 if (selrtn == -1 && errno == EINTR) {
855 async_processing(&r_fds);
856 /*
857 * After async processing we must go and do the select again, as
858 * the state of the flag in fds for the server file descriptor is
859 * indeterminate - we may have done I/O on it in the oplock processing. JRA.
860 */
861 goto again;
862 }
863
864 /* Check if error */
865 if (selrtn == -1) {
866 /* something is wrong. Maybe the socket is dead? */
867 return map_nt_error_from_unix(errno);
868 }
869
870 /* Did we timeout ? */
871 if (selrtn == 0) {
872 return NT_STATUS_IO_TIMEOUT;
873 }
874
875 /*
876 * Ensure we process oplock break messages by preference.
877 * This is IMPORTANT ! Otherwise we can starve other processes
878 * sending us an oplock break message. JRA.
879 */
880
881 if (oplock_message_waiting(&r_fds)) {
882 async_processing(&r_fds);
883 /*
884 * After async processing we must go and do the select again, as
885 * the state of the flag in fds for the server file descriptor is
886 * indeterminate - we may have done I/O on it in the oplock processing. JRA.
887 */
888 goto again;
889 }
890
891 /*
892 * We've just woken up from a protentially long select sleep.
893 * Ensure we process local messages as we need to synchronously
894 * process any messages from other smbd's to avoid file rename race
895 * conditions. This call is cheap if there are no messages waiting.
896 * JRA.
897 */
898 message_dispatch(smbd_messaging_context());
899
900 status = receive_smb_talloc(mem_ctx, smbd_server_fd(), buffer, 0,
901 p_unread, p_encrypted, &len);
902
903 if (!NT_STATUS_IS_OK(status)) {
904 return status;
905 }
906
907 *buffer_len = len;
908
909 return NT_STATUS_OK;
910}
911
912/*
913 * Only allow 5 outstanding trans requests. We're allocating memory, so
914 * prevent a DoS.
915 */
916
917NTSTATUS allow_new_trans(struct trans_state *list, int mid)
918{
919 int count = 0;
920 for (; list != NULL; list = list->next) {
921
922 if (list->mid == mid) {
923 return NT_STATUS_INVALID_PARAMETER;
924 }
925
926 count += 1;
927 }
928 if (count > 5) {
929 return NT_STATUS_INSUFFICIENT_RESOURCES;
930 }
931
932 return NT_STATUS_OK;
933}
934
935/****************************************************************************
936 We're terminating and have closed all our files/connections etc.
937 If there are any pending local messages we need to respond to them
938 before termination so that other smbds don't think we just died whilst
939 holding oplocks.
940****************************************************************************/
941
942void respond_to_all_remaining_local_messages(void)
943{
944 /*
945 * Assert we have no exclusive open oplocks.
946 */
947
948 if(get_number_of_exclusive_open_oplocks()) {
949 DEBUG(0,("respond_to_all_remaining_local_messages: PANIC : we have %d exclusive oplocks.\n",
950 get_number_of_exclusive_open_oplocks() ));
951 return;
952 }
953
954 process_kernel_oplocks(smbd_messaging_context(), NULL);
955
956 return;
957}
958
959
960/*
961These flags determine some of the permissions required to do an operation
962
963Note that I don't set NEED_WRITE on some write operations because they
964are used by some brain-dead clients when printing, and I don't want to
965force write permissions on print services.
966*/
967#define AS_USER (1<<0)
968#define NEED_WRITE (1<<1) /* Must be paired with AS_USER */
969#define TIME_INIT (1<<2)
970#define CAN_IPC (1<<3) /* Must be paired with AS_USER */
971#define AS_GUEST (1<<5) /* Must *NOT* be paired with AS_USER */
972#define DO_CHDIR (1<<6)
973
974/*
975 define a list of possible SMB messages and their corresponding
976 functions. Any message that has a NULL function is unimplemented -
977 please feel free to contribute implementations!
978*/
979static const struct smb_message_struct {
980 const char *name;
981 void (*fn_new)(struct smb_request *req);
982 int flags;
983} smb_messages[256] = {
984
985/* 0x00 */ { "SMBmkdir",reply_mkdir,AS_USER | NEED_WRITE},
986/* 0x01 */ { "SMBrmdir",reply_rmdir,AS_USER | NEED_WRITE},
987/* 0x02 */ { "SMBopen",reply_open,AS_USER },
988/* 0x03 */ { "SMBcreate",reply_mknew,AS_USER},
989/* 0x04 */ { "SMBclose",reply_close,AS_USER | CAN_IPC },
990/* 0x05 */ { "SMBflush",reply_flush,AS_USER},
991/* 0x06 */ { "SMBunlink",reply_unlink,AS_USER | NEED_WRITE },
992/* 0x07 */ { "SMBmv",reply_mv,AS_USER | NEED_WRITE },
993/* 0x08 */ { "SMBgetatr",reply_getatr,AS_USER},
994/* 0x09 */ { "SMBsetatr",reply_setatr,AS_USER | NEED_WRITE},
995/* 0x0a */ { "SMBread",reply_read,AS_USER},
996/* 0x0b */ { "SMBwrite",reply_write,AS_USER | CAN_IPC },
997/* 0x0c */ { "SMBlock",reply_lock,AS_USER},
998/* 0x0d */ { "SMBunlock",reply_unlock,AS_USER},
999/* 0x0e */ { "SMBctemp",reply_ctemp,AS_USER },
1000/* 0x0f */ { "SMBmknew",reply_mknew,AS_USER},
1001/* 0x10 */ { "SMBcheckpath",reply_checkpath,AS_USER},
1002/* 0x11 */ { "SMBexit",reply_exit,DO_CHDIR},
1003/* 0x12 */ { "SMBlseek",reply_lseek,AS_USER},
1004/* 0x13 */ { "SMBlockread",reply_lockread,AS_USER},
1005/* 0x14 */ { "SMBwriteunlock",reply_writeunlock,AS_USER},
1006/* 0x15 */ { NULL, NULL, 0 },
1007/* 0x16 */ { NULL, NULL, 0 },
1008/* 0x17 */ { NULL, NULL, 0 },
1009/* 0x18 */ { NULL, NULL, 0 },
1010/* 0x19 */ { NULL, NULL, 0 },
1011/* 0x1a */ { "SMBreadbraw",reply_readbraw,AS_USER},
1012/* 0x1b */ { "SMBreadBmpx",reply_readbmpx,AS_USER},
1013/* 0x1c */ { "SMBreadBs",reply_readbs,AS_USER },
1014/* 0x1d */ { "SMBwritebraw",reply_writebraw,AS_USER},
1015/* 0x1e */ { "SMBwriteBmpx",reply_writebmpx,AS_USER},
1016/* 0x1f */ { "SMBwriteBs",reply_writebs,AS_USER},
1017/* 0x20 */ { "SMBwritec", NULL,0},
1018/* 0x21 */ { NULL, NULL, 0 },
1019/* 0x22 */ { "SMBsetattrE",reply_setattrE,AS_USER | NEED_WRITE },
1020/* 0x23 */ { "SMBgetattrE",reply_getattrE,AS_USER },
1021/* 0x24 */ { "SMBlockingX",reply_lockingX,AS_USER },
1022/* 0x25 */ { "SMBtrans",reply_trans,AS_USER | CAN_IPC },
1023/* 0x26 */ { "SMBtranss",reply_transs,AS_USER | CAN_IPC},
1024/* 0x27 */ { "SMBioctl",reply_ioctl,0},
1025/* 0x28 */ { "SMBioctls", NULL,AS_USER},
1026/* 0x29 */ { "SMBcopy",reply_copy,AS_USER | NEED_WRITE },
1027/* 0x2a */ { "SMBmove", NULL,AS_USER | NEED_WRITE },
1028/* 0x2b */ { "SMBecho",reply_echo,0},
1029/* 0x2c */ { "SMBwriteclose",reply_writeclose,AS_USER},
1030/* 0x2d */ { "SMBopenX",reply_open_and_X,AS_USER | CAN_IPC },
1031/* 0x2e */ { "SMBreadX",reply_read_and_X,AS_USER | CAN_IPC },
1032/* 0x2f */ { "SMBwriteX",reply_write_and_X,AS_USER | CAN_IPC },
1033/* 0x30 */ { NULL, NULL, 0 },
1034/* 0x31 */ { NULL, NULL, 0 },
1035/* 0x32 */ { "SMBtrans2",reply_trans2, AS_USER | CAN_IPC },
1036/* 0x33 */ { "SMBtranss2",reply_transs2, AS_USER},
1037/* 0x34 */ { "SMBfindclose",reply_findclose,AS_USER},
1038/* 0x35 */ { "SMBfindnclose",reply_findnclose,AS_USER},
1039/* 0x36 */ { NULL, NULL, 0 },
1040/* 0x37 */ { NULL, NULL, 0 },
1041/* 0x38 */ { NULL, NULL, 0 },
1042/* 0x39 */ { NULL, NULL, 0 },
1043/* 0x3a */ { NULL, NULL, 0 },
1044/* 0x3b */ { NULL, NULL, 0 },
1045/* 0x3c */ { NULL, NULL, 0 },
1046/* 0x3d */ { NULL, NULL, 0 },
1047/* 0x3e */ { NULL, NULL, 0 },
1048/* 0x3f */ { NULL, NULL, 0 },
1049/* 0x40 */ { NULL, NULL, 0 },
1050/* 0x41 */ { NULL, NULL, 0 },
1051/* 0x42 */ { NULL, NULL, 0 },
1052/* 0x43 */ { NULL, NULL, 0 },
1053/* 0x44 */ { NULL, NULL, 0 },
1054/* 0x45 */ { NULL, NULL, 0 },
1055/* 0x46 */ { NULL, NULL, 0 },
1056/* 0x47 */ { NULL, NULL, 0 },
1057/* 0x48 */ { NULL, NULL, 0 },
1058/* 0x49 */ { NULL, NULL, 0 },
1059/* 0x4a */ { NULL, NULL, 0 },
1060/* 0x4b */ { NULL, NULL, 0 },
1061/* 0x4c */ { NULL, NULL, 0 },
1062/* 0x4d */ { NULL, NULL, 0 },
1063/* 0x4e */ { NULL, NULL, 0 },
1064/* 0x4f */ { NULL, NULL, 0 },
1065/* 0x50 */ { NULL, NULL, 0 },
1066/* 0x51 */ { NULL, NULL, 0 },
1067/* 0x52 */ { NULL, NULL, 0 },
1068/* 0x53 */ { NULL, NULL, 0 },
1069/* 0x54 */ { NULL, NULL, 0 },
1070/* 0x55 */ { NULL, NULL, 0 },
1071/* 0x56 */ { NULL, NULL, 0 },
1072/* 0x57 */ { NULL, NULL, 0 },
1073/* 0x58 */ { NULL, NULL, 0 },
1074/* 0x59 */ { NULL, NULL, 0 },
1075/* 0x5a */ { NULL, NULL, 0 },
1076/* 0x5b */ { NULL, NULL, 0 },
1077/* 0x5c */ { NULL, NULL, 0 },
1078/* 0x5d */ { NULL, NULL, 0 },
1079/* 0x5e */ { NULL, NULL, 0 },
1080/* 0x5f */ { NULL, NULL, 0 },
1081/* 0x60 */ { NULL, NULL, 0 },
1082/* 0x61 */ { NULL, NULL, 0 },
1083/* 0x62 */ { NULL, NULL, 0 },
1084/* 0x63 */ { NULL, NULL, 0 },
1085/* 0x64 */ { NULL, NULL, 0 },
1086/* 0x65 */ { NULL, NULL, 0 },
1087/* 0x66 */ { NULL, NULL, 0 },
1088/* 0x67 */ { NULL, NULL, 0 },
1089/* 0x68 */ { NULL, NULL, 0 },
1090/* 0x69 */ { NULL, NULL, 0 },
1091/* 0x6a */ { NULL, NULL, 0 },
1092/* 0x6b */ { NULL, NULL, 0 },
1093/* 0x6c */ { NULL, NULL, 0 },
1094/* 0x6d */ { NULL, NULL, 0 },
1095/* 0x6e */ { NULL, NULL, 0 },
1096/* 0x6f */ { NULL, NULL, 0 },
1097/* 0x70 */ { "SMBtcon",reply_tcon,0},
1098/* 0x71 */ { "SMBtdis",reply_tdis,DO_CHDIR},
1099/* 0x72 */ { "SMBnegprot",reply_negprot,0},
1100/* 0x73 */ { "SMBsesssetupX",reply_sesssetup_and_X,0},
1101/* 0x74 */ { "SMBulogoffX",reply_ulogoffX, 0}, /* ulogoff doesn't give a valid TID */
1102/* 0x75 */ { "SMBtconX",reply_tcon_and_X,0},
1103/* 0x76 */ { NULL, NULL, 0 },
1104/* 0x77 */ { NULL, NULL, 0 },
1105/* 0x78 */ { NULL, NULL, 0 },
1106/* 0x79 */ { NULL, NULL, 0 },
1107/* 0x7a */ { NULL, NULL, 0 },
1108/* 0x7b */ { NULL, NULL, 0 },
1109/* 0x7c */ { NULL, NULL, 0 },
1110/* 0x7d */ { NULL, NULL, 0 },
1111/* 0x7e */ { NULL, NULL, 0 },
1112/* 0x7f */ { NULL, NULL, 0 },
1113/* 0x80 */ { "SMBdskattr",reply_dskattr,AS_USER},
1114/* 0x81 */ { "SMBsearch",reply_search,AS_USER},
1115/* 0x82 */ { "SMBffirst",reply_search,AS_USER},
1116/* 0x83 */ { "SMBfunique",reply_search,AS_USER},
1117/* 0x84 */ { "SMBfclose",reply_fclose,AS_USER},
1118/* 0x85 */ { NULL, NULL, 0 },
1119/* 0x86 */ { NULL, NULL, 0 },
1120/* 0x87 */ { NULL, NULL, 0 },
1121/* 0x88 */ { NULL, NULL, 0 },
1122/* 0x89 */ { NULL, NULL, 0 },
1123/* 0x8a */ { NULL, NULL, 0 },
1124/* 0x8b */ { NULL, NULL, 0 },
1125/* 0x8c */ { NULL, NULL, 0 },
1126/* 0x8d */ { NULL, NULL, 0 },
1127/* 0x8e */ { NULL, NULL, 0 },
1128/* 0x8f */ { NULL, NULL, 0 },
1129/* 0x90 */ { NULL, NULL, 0 },
1130/* 0x91 */ { NULL, NULL, 0 },
1131/* 0x92 */ { NULL, NULL, 0 },
1132/* 0x93 */ { NULL, NULL, 0 },
1133/* 0x94 */ { NULL, NULL, 0 },
1134/* 0x95 */ { NULL, NULL, 0 },
1135/* 0x96 */ { NULL, NULL, 0 },
1136/* 0x97 */ { NULL, NULL, 0 },
1137/* 0x98 */ { NULL, NULL, 0 },
1138/* 0x99 */ { NULL, NULL, 0 },
1139/* 0x9a */ { NULL, NULL, 0 },
1140/* 0x9b */ { NULL, NULL, 0 },
1141/* 0x9c */ { NULL, NULL, 0 },
1142/* 0x9d */ { NULL, NULL, 0 },
1143/* 0x9e */ { NULL, NULL, 0 },
1144/* 0x9f */ { NULL, NULL, 0 },
1145/* 0xa0 */ { "SMBnttrans",reply_nttrans, AS_USER | CAN_IPC },
1146/* 0xa1 */ { "SMBnttranss",reply_nttranss, AS_USER | CAN_IPC },
1147/* 0xa2 */ { "SMBntcreateX",reply_ntcreate_and_X, AS_USER | CAN_IPC },
1148/* 0xa3 */ { NULL, NULL, 0 },
1149/* 0xa4 */ { "SMBntcancel",reply_ntcancel, 0 },
1150/* 0xa5 */ { "SMBntrename",reply_ntrename, AS_USER | NEED_WRITE },
1151/* 0xa6 */ { NULL, NULL, 0 },
1152/* 0xa7 */ { NULL, NULL, 0 },
1153/* 0xa8 */ { NULL, NULL, 0 },
1154/* 0xa9 */ { NULL, NULL, 0 },
1155/* 0xaa */ { NULL, NULL, 0 },
1156/* 0xab */ { NULL, NULL, 0 },
1157/* 0xac */ { NULL, NULL, 0 },
1158/* 0xad */ { NULL, NULL, 0 },
1159/* 0xae */ { NULL, NULL, 0 },
1160/* 0xaf */ { NULL, NULL, 0 },
1161/* 0xb0 */ { NULL, NULL, 0 },
1162/* 0xb1 */ { NULL, NULL, 0 },
1163/* 0xb2 */ { NULL, NULL, 0 },
1164/* 0xb3 */ { NULL, NULL, 0 },
1165/* 0xb4 */ { NULL, NULL, 0 },
1166/* 0xb5 */ { NULL, NULL, 0 },
1167/* 0xb6 */ { NULL, NULL, 0 },
1168/* 0xb7 */ { NULL, NULL, 0 },
1169/* 0xb8 */ { NULL, NULL, 0 },
1170/* 0xb9 */ { NULL, NULL, 0 },
1171/* 0xba */ { NULL, NULL, 0 },
1172/* 0xbb */ { NULL, NULL, 0 },
1173/* 0xbc */ { NULL, NULL, 0 },
1174/* 0xbd */ { NULL, NULL, 0 },
1175/* 0xbe */ { NULL, NULL, 0 },
1176/* 0xbf */ { NULL, NULL, 0 },
1177/* 0xc0 */ { "SMBsplopen",reply_printopen,AS_USER},
1178/* 0xc1 */ { "SMBsplwr",reply_printwrite,AS_USER},
1179/* 0xc2 */ { "SMBsplclose",reply_printclose,AS_USER},
1180/* 0xc3 */ { "SMBsplretq",reply_printqueue,AS_USER},
1181/* 0xc4 */ { NULL, NULL, 0 },
1182/* 0xc5 */ { NULL, NULL, 0 },
1183/* 0xc6 */ { NULL, NULL, 0 },
1184/* 0xc7 */ { NULL, NULL, 0 },
1185/* 0xc8 */ { NULL, NULL, 0 },
1186/* 0xc9 */ { NULL, NULL, 0 },
1187/* 0xca */ { NULL, NULL, 0 },
1188/* 0xcb */ { NULL, NULL, 0 },
1189/* 0xcc */ { NULL, NULL, 0 },
1190/* 0xcd */ { NULL, NULL, 0 },
1191/* 0xce */ { NULL, NULL, 0 },
1192/* 0xcf */ { NULL, NULL, 0 },
1193/* 0xd0 */ { "SMBsends",reply_sends,AS_GUEST},
1194/* 0xd1 */ { "SMBsendb", NULL,AS_GUEST},
1195/* 0xd2 */ { "SMBfwdname", NULL,AS_GUEST},
1196/* 0xd3 */ { "SMBcancelf", NULL,AS_GUEST},
1197/* 0xd4 */ { "SMBgetmac", NULL,AS_GUEST},
1198/* 0xd5 */ { "SMBsendstrt",reply_sendstrt,AS_GUEST},
1199/* 0xd6 */ { "SMBsendend",reply_sendend,AS_GUEST},
1200/* 0xd7 */ { "SMBsendtxt",reply_sendtxt,AS_GUEST},
1201/* 0xd8 */ { NULL, NULL, 0 },
1202/* 0xd9 */ { NULL, NULL, 0 },
1203/* 0xda */ { NULL, NULL, 0 },
1204/* 0xdb */ { NULL, NULL, 0 },
1205/* 0xdc */ { NULL, NULL, 0 },
1206/* 0xdd */ { NULL, NULL, 0 },
1207/* 0xde */ { NULL, NULL, 0 },
1208/* 0xdf */ { NULL, NULL, 0 },
1209/* 0xe0 */ { NULL, NULL, 0 },
1210/* 0xe1 */ { NULL, NULL, 0 },
1211/* 0xe2 */ { NULL, NULL, 0 },
1212/* 0xe3 */ { NULL, NULL, 0 },
1213/* 0xe4 */ { NULL, NULL, 0 },
1214/* 0xe5 */ { NULL, NULL, 0 },
1215/* 0xe6 */ { NULL, NULL, 0 },
1216/* 0xe7 */ { NULL, NULL, 0 },
1217/* 0xe8 */ { NULL, NULL, 0 },
1218/* 0xe9 */ { NULL, NULL, 0 },
1219/* 0xea */ { NULL, NULL, 0 },
1220/* 0xeb */ { NULL, NULL, 0 },
1221/* 0xec */ { NULL, NULL, 0 },
1222/* 0xed */ { NULL, NULL, 0 },
1223/* 0xee */ { NULL, NULL, 0 },
1224/* 0xef */ { NULL, NULL, 0 },
1225/* 0xf0 */ { NULL, NULL, 0 },
1226/* 0xf1 */ { NULL, NULL, 0 },
1227/* 0xf2 */ { NULL, NULL, 0 },
1228/* 0xf3 */ { NULL, NULL, 0 },
1229/* 0xf4 */ { NULL, NULL, 0 },
1230/* 0xf5 */ { NULL, NULL, 0 },
1231/* 0xf6 */ { NULL, NULL, 0 },
1232/* 0xf7 */ { NULL, NULL, 0 },
1233/* 0xf8 */ { NULL, NULL, 0 },
1234/* 0xf9 */ { NULL, NULL, 0 },
1235/* 0xfa */ { NULL, NULL, 0 },
1236/* 0xfb */ { NULL, NULL, 0 },
1237/* 0xfc */ { NULL, NULL, 0 },
1238/* 0xfd */ { NULL, NULL, 0 },
1239/* 0xfe */ { NULL, NULL, 0 },
1240/* 0xff */ { NULL, NULL, 0 }
1241
1242};
1243
1244/*******************************************************************
1245 allocate and initialize a reply packet
1246********************************************************************/
1247
1248void reply_outbuf(struct smb_request *req, uint8 num_words, uint32 num_bytes)
1249{
1250 /*
1251 * Protect against integer wrap
1252 */
1253 if ((num_bytes > 0xffffff)
1254 || ((num_bytes + smb_size + num_words*2) > 0xffffff)) {
1255 char *msg;
1256 if (asprintf(&msg, "num_bytes too large: %u",
1257 (unsigned)num_bytes) == -1) {
1258 msg = CONST_DISCARD(char *, "num_bytes too large");
1259 }
1260 smb_panic(msg);
1261 }
1262
1263 if (!(req->outbuf = TALLOC_ARRAY(
1264 req, uint8,
1265 smb_size + num_words*2 + num_bytes))) {
1266 smb_panic("could not allocate output buffer\n");
1267 }
1268
1269 construct_reply_common((char *)req->inbuf, (char *)req->outbuf);
1270 srv_set_message((char *)req->outbuf, num_words, num_bytes, false);
1271 /*
1272 * Zero out the word area, the caller has to take care of the bcc area
1273 * himself
1274 */
1275 if (num_words != 0) {
1276 memset(req->outbuf + smb_vwv0, 0, num_words*2);
1277 }
1278
1279 return;
1280}
1281
1282
1283/*******************************************************************
1284 Dump a packet to a file.
1285********************************************************************/
1286
1287static void smb_dump(const char *name, int type, const char *data, ssize_t len)
1288{
1289 int fd, i;
1290 char *fname = NULL;
1291 if (DEBUGLEVEL < 50) {
1292 return;
1293 }
1294
1295 if (len < 4) len = smb_len(data)+4;
1296 for (i=1;i<100;i++) {
1297 if (asprintf(&fname, "/tmp/%s.%d.%s", name, i,
1298 type ? "req" : "resp") == -1) {
1299 return;
1300 }
1301 fd = open(fname, O_WRONLY|O_CREAT|O_EXCL, 0644);
1302 if (fd != -1 || errno != EEXIST) break;
1303 }
1304 if (fd != -1) {
1305 ssize_t ret = write(fd, data, len);
1306 if (ret != len)
1307 DEBUG(0,("smb_dump: problem: write returned %d\n", (int)ret ));
1308 close(fd);
1309 DEBUG(0,("created %s len %lu\n", fname, (unsigned long)len));
1310 }
1311 SAFE_FREE(fname);
1312}
1313
1314/****************************************************************************
1315 Prepare everything for calling the actual request function, and potentially
1316 call the request function via the "new" interface.
1317
1318 Return False if the "legacy" function needs to be called, everything is
1319 prepared.
1320
1321 Return True if we're done.
1322
1323 I know this API sucks, but it is the one with the least code change I could
1324 find.
1325****************************************************************************/
1326
1327static connection_struct *switch_message(uint8 type, struct smb_request *req, int size)
1328{
1329 int flags;
1330 uint16 session_tag;
1331 connection_struct *conn = NULL;
1332
1333 static uint16 last_session_tag = UID_FIELD_INVALID;
1334
1335 errno = 0;
1336
1337 /* Make sure this is an SMB packet. smb_size contains NetBIOS header
1338 * so subtract 4 from it. */
1339 if (!valid_smb_header(req->inbuf)
1340 || (size < (smb_size - 4))) {
1341 DEBUG(2,("Non-SMB packet of length %d. Terminating server\n",
1342 smb_len(req->inbuf)));
1343 exit_server_cleanly("Non-SMB packet");
1344 }
1345
1346 if (smb_messages[type].fn_new == NULL) {
1347 DEBUG(0,("Unknown message type %d!\n",type));
1348 smb_dump("Unknown", 1, (char *)req->inbuf, size);
1349 reply_unknown_new(req, type);
1350 return NULL;
1351 }
1352
1353 flags = smb_messages[type].flags;
1354
1355 /* In share mode security we must ignore the vuid. */
1356 session_tag = (lp_security() == SEC_SHARE)
1357 ? UID_FIELD_INVALID : req->vuid;
1358 conn = req->conn;
1359
1360 DEBUG(3,("switch message %s (pid %d) conn 0x%lx\n", smb_fn_name(type),
1361 (int)sys_getpid(), (unsigned long)conn));
1362
1363 smb_dump(smb_fn_name(type), 1, (char *)req->inbuf, size);
1364
1365 /* Ensure this value is replaced in the incoming packet. */
1366 SSVAL(req->inbuf,smb_uid,session_tag);
1367
1368 /*
1369 * Ensure the correct username is in current_user_info. This is a
1370 * really ugly bugfix for problems with multiple session_setup_and_X's
1371 * being done and allowing %U and %G substitutions to work correctly.
1372 * There is a reason this code is done here, don't move it unless you
1373 * know what you're doing... :-).
1374 * JRA.
1375 */
1376
1377 if (session_tag != last_session_tag) {
1378 user_struct *vuser = NULL;
1379
1380 last_session_tag = session_tag;
1381 if(session_tag != UID_FIELD_INVALID) {
1382 vuser = get_valid_user_struct(session_tag);
1383 if (vuser) {
1384 set_current_user_info(&vuser->user);
1385 }
1386 }
1387 }
1388
1389 /* Does this call need to be run as the connected user? */
1390 if (flags & AS_USER) {
1391
1392 /* Does this call need a valid tree connection? */
1393 if (!conn) {
1394 /*
1395 * Amazingly, the error code depends on the command
1396 * (from Samba4).
1397 */
1398 if (type == SMBntcreateX) {
1399 reply_nterror(req, NT_STATUS_INVALID_HANDLE);
1400 } else {
1401 reply_doserror(req, ERRSRV, ERRinvnid);
1402 }
1403 return NULL;
1404 }
1405
1406 if (!change_to_user(conn,session_tag)) {
1407 reply_nterror(req, NT_STATUS_DOS(ERRSRV, ERRbaduid));
1408 return conn;
1409 }
1410
1411 /* All NEED_WRITE and CAN_IPC flags must also have AS_USER. */
1412
1413 /* Does it need write permission? */
1414 if ((flags & NEED_WRITE) && !CAN_WRITE(conn)) {
1415 reply_nterror(req, NT_STATUS_MEDIA_WRITE_PROTECTED);
1416 return conn;
1417 }
1418
1419 /* IPC services are limited */
1420 if (IS_IPC(conn) && !(flags & CAN_IPC)) {
1421 reply_doserror(req, ERRSRV,ERRaccess);
1422 return conn;
1423 }
1424 } else {
1425 /* This call needs to be run as root */
1426 change_to_root_user();
1427 }
1428
1429 /* load service specific parameters */
1430 if (conn) {
1431 if (req->encrypted) {
1432 conn->encrypted_tid = true;
1433 /* encrypted required from now on. */
1434 conn->encrypt_level = Required;
1435 } else if (ENCRYPTION_REQUIRED(conn)) {
1436 uint8 com = CVAL(req->inbuf,smb_com);
1437 if (com != SMBtrans2 && com != SMBtranss2) {
1438 exit_server_cleanly("encryption required "
1439 "on connection");
1440 return conn;
1441 }
1442 }
1443
1444 if (!set_current_service(conn,SVAL(req->inbuf,smb_flg),
1445 (flags & (AS_USER|DO_CHDIR)
1446 ?True:False))) {
1447 reply_doserror(req, ERRSRV, ERRaccess);
1448 return conn;
1449 }
1450 conn->num_smb_operations++;
1451 }
1452
1453 /* does this protocol need to be run as guest? */
1454 if ((flags & AS_GUEST)
1455 && (!change_to_guest() ||
1456 !check_access(smbd_server_fd(), lp_hostsallow(-1),
1457 lp_hostsdeny(-1)))) {
1458 reply_doserror(req, ERRSRV, ERRaccess);
1459 return conn;
1460 }
1461
1462 smb_messages[type].fn_new(req);
1463 return req->conn;
1464}
1465
1466/****************************************************************************
1467 Construct a reply to the incoming packet.
1468****************************************************************************/
1469
1470static void construct_reply(char *inbuf, int size, size_t unread_bytes, bool encrypted)
1471{
1472 uint8 type = CVAL(inbuf,smb_com);
1473 connection_struct *conn;
1474 struct smb_request *req;
1475
1476 chain_size = 0;
1477 file_chain_reset();
1478 reset_chain_p();
1479
1480 if (!(req = talloc(talloc_tos(), struct smb_request))) {
1481 smb_panic("could not allocate smb_request");
1482 }
1483 init_smb_request(req, (uint8 *)inbuf, unread_bytes, encrypted);
1484
1485 conn = switch_message(type, req, size);
1486
1487 if (req->unread_bytes) {
1488 /* writeX failed. drain socket. */
1489 if (drain_socket(smbd_server_fd(), req->unread_bytes) !=
1490 req->unread_bytes) {
1491 smb_panic("failed to drain pending bytes");
1492 }
1493 req->unread_bytes = 0;
1494 }
1495
1496 if (req->outbuf == NULL) {
1497 return;
1498 }
1499
1500 if (CVAL(req->outbuf,0) == 0) {
1501 show_msg((char *)req->outbuf);
1502 }
1503
1504 if (!srv_send_smb(smbd_server_fd(),
1505 (char *)req->outbuf,
1506 IS_CONN_ENCRYPTED(conn)||req->encrypted)) {
1507 exit_server_cleanly("construct_reply: srv_send_smb failed.");
1508 }
1509
1510 TALLOC_FREE(req);
1511
1512 return;
1513}
1514
1515/****************************************************************************
1516 Process an smb from the client
1517****************************************************************************/
1518
1519static void process_smb(char *inbuf, size_t nread, size_t unread_bytes, bool encrypted)
1520{
1521 static int trans_num;
1522 int msg_type = CVAL(inbuf,0);
1523
1524 DO_PROFILE_INC(smb_count);
1525
1526 if (trans_num == 0) {
1527 char addr[INET6_ADDRSTRLEN];
1528
1529 /* on the first packet, check the global hosts allow/ hosts
1530 deny parameters before doing any parsing of the packet
1531 passed to us by the client. This prevents attacks on our
1532 parsing code from hosts not in the hosts allow list */
1533
1534 if (!check_access(smbd_server_fd(), lp_hostsallow(-1),
1535 lp_hostsdeny(-1))) {
1536 /* send a negative session response "not listening on calling name" */
1537 static unsigned char buf[5] = {0x83, 0, 0, 1, 0x81};
1538 DEBUG( 1, ( "Connection denied from %s\n",
1539 client_addr(get_client_fd(),addr,sizeof(addr)) ) );
1540 (void)srv_send_smb(smbd_server_fd(),(char *)buf,false);
1541 exit_server_cleanly("connection denied");
1542 }
1543 }
1544
1545 DEBUG( 6, ( "got message type 0x%x of len 0x%x\n", msg_type,
1546 smb_len(inbuf) ) );
1547 DEBUG( 3, ( "Transaction %d of length %d (%u toread)\n", trans_num,
1548 (int)nread,
1549 (unsigned int)unread_bytes ));
1550
1551 if (msg_type != 0) {
1552 /*
1553 * NetBIOS session request, keepalive, etc.
1554 */
1555 reply_special(inbuf);
1556 return;
1557 }
1558
1559 show_msg(inbuf);
1560
1561 construct_reply(inbuf,nread,unread_bytes,encrypted);
1562
1563 trans_num++;
1564}
1565
1566/****************************************************************************
1567 Return a string containing the function name of a SMB command.
1568****************************************************************************/
1569
1570const char *smb_fn_name(int type)
1571{
1572 const char *unknown_name = "SMBunknown";
1573
1574 if (smb_messages[type].name == NULL)
1575 return(unknown_name);
1576
1577 return(smb_messages[type].name);
1578}
1579
1580/****************************************************************************
1581 Helper functions for contruct_reply.
1582****************************************************************************/
1583
1584static uint32 common_flags2 = FLAGS2_LONG_PATH_COMPONENTS|FLAGS2_32_BIT_ERROR_CODES;
1585
1586void add_to_common_flags2(uint32 v)
1587{
1588 common_flags2 |= v;
1589}
1590
1591void remove_from_common_flags2(uint32 v)
1592{
1593 common_flags2 &= ~v;
1594}
1595
1596void construct_reply_common(const char *inbuf, char *outbuf)
1597{
1598 srv_set_message(outbuf,0,0,false);
1599
1600 SCVAL(outbuf,smb_com,CVAL(inbuf,smb_com));
1601 SIVAL(outbuf,smb_rcls,0);
1602 SCVAL(outbuf,smb_flg, FLAG_REPLY | (CVAL(inbuf,smb_flg) & FLAG_CASELESS_PATHNAMES));
1603 SSVAL(outbuf,smb_flg2,
1604 (SVAL(inbuf,smb_flg2) & FLAGS2_UNICODE_STRINGS) |
1605 common_flags2);
1606 memset(outbuf+smb_pidhigh,'\0',(smb_tid-smb_pidhigh));
1607
1608 SSVAL(outbuf,smb_tid,SVAL(inbuf,smb_tid));
1609 SSVAL(outbuf,smb_pid,SVAL(inbuf,smb_pid));
1610 SSVAL(outbuf,smb_uid,SVAL(inbuf,smb_uid));
1611 SSVAL(outbuf,smb_mid,SVAL(inbuf,smb_mid));
1612}
1613
1614/****************************************************************************
1615 Construct a chained reply and add it to the already made reply
1616****************************************************************************/
1617
1618void chain_reply(struct smb_request *req)
1619{
1620 static char *orig_inbuf;
1621
1622 /*
1623 * Dirty little const_discard: We mess with req->inbuf, which is
1624 * declared as const. If maybe at some point this routine gets
1625 * rewritten, this const_discard could go away.
1626 */
1627 char *inbuf = CONST_DISCARD(char *, req->inbuf);
1628 int size = smb_len(req->inbuf)+4;
1629
1630 int smb_com1, smb_com2 = CVAL(inbuf,smb_vwv0);
1631 unsigned smb_off2 = SVAL(inbuf,smb_vwv1);
1632 char *inbuf2;
1633 int outsize2;
1634 int new_size;
1635 char inbuf_saved[smb_wct];
1636 char *outbuf = (char *)req->outbuf;
1637 size_t outsize = smb_len(outbuf) + 4;
1638 size_t outsize_padded;
1639 size_t padding;
1640 size_t ofs, to_move;
1641
1642 struct smb_request *req2;
1643 size_t caller_outputlen;
1644 char *caller_output;
1645
1646 /* Maybe its not chained, or it's an error packet. */
1647 if (smb_com2 == 0xFF || SVAL(outbuf,smb_rcls) != 0) {
1648 SCVAL(outbuf,smb_vwv0,0xFF);
1649 return;
1650 }
1651
1652 if (chain_size == 0) {
1653 /* this is the first part of the chain */
1654 orig_inbuf = inbuf;
1655 }
1656
1657 /*
1658 * We need to save the output the caller added to the chain so that we
1659 * can splice it into the final output buffer later.
1660 */
1661
1662 caller_outputlen = outsize - smb_wct;
1663
1664 caller_output = (char *)memdup(outbuf + smb_wct, caller_outputlen);
1665
1666 if (caller_output == NULL) {
1667 /* TODO: NT_STATUS_NO_MEMORY */
1668 smb_panic("could not dup outbuf");
1669 }
1670
1671 /*
1672 * The original Win95 redirector dies on a reply to
1673 * a lockingX and read chain unless the chain reply is
1674 * 4 byte aligned. JRA.
1675 */
1676
1677 outsize_padded = (outsize + 3) & ~3;
1678 padding = outsize_padded - outsize;
1679
1680 /*
1681 * remember how much the caller added to the chain, only counting
1682 * stuff after the parameter words
1683 */
1684 chain_size += (outsize_padded - smb_wct);
1685
1686 /*
1687 * work out pointers into the original packets. The
1688 * headers on these need to be filled in
1689 */
1690 inbuf2 = orig_inbuf + smb_off2 + 4 - smb_wct;
1691
1692 /* remember the original command type */
1693 smb_com1 = CVAL(orig_inbuf,smb_com);
1694
1695 /* save the data which will be overwritten by the new headers */
1696 memcpy(inbuf_saved,inbuf2,smb_wct);
1697
1698 /* give the new packet the same header as the last part of the SMB */
1699 memmove(inbuf2,inbuf,smb_wct);
1700
1701 /* create the in buffer */
1702 SCVAL(inbuf2,smb_com,smb_com2);
1703
1704 /* work out the new size for the in buffer. */
1705 new_size = size - (inbuf2 - inbuf);
1706 if (new_size < 0) {
1707 DEBUG(0,("chain_reply: chain packet size incorrect "
1708 "(orig size = %d, offset = %d)\n",
1709 size, (int)(inbuf2 - inbuf) ));
1710 exit_server_cleanly("Bad chained packet");
1711 return;
1712 }
1713
1714 /* And set it in the header. */
1715 smb_setlen(inbuf2, new_size - 4);
1716
1717 DEBUG(3,("Chained message\n"));
1718 show_msg(inbuf2);
1719
1720 if (!(req2 = talloc(talloc_tos(), struct smb_request))) {
1721 smb_panic("could not allocate smb_request");
1722 }
1723 init_smb_request(req2, (uint8 *)inbuf2,0, req->encrypted);
1724
1725 /* process the request */
1726 switch_message(smb_com2, req2, new_size);
1727
1728 /*
1729 * We don't accept deferred operations in chained requests.
1730 */
1731 SMB_ASSERT(req2->outbuf != NULL);
1732 outsize2 = smb_len(req2->outbuf)+4;
1733
1734 /*
1735 * Move away the new command output so that caller_output fits in,
1736 * copy in the caller_output saved above.
1737 */
1738
1739 SMB_ASSERT(outsize_padded >= smb_wct);
1740
1741 /*
1742 * "ofs" is the space we need for caller_output. Equal to
1743 * caller_outputlen plus the padding.
1744 */
1745
1746 ofs = outsize_padded - smb_wct;
1747
1748 /*
1749 * "to_move" is the amount of bytes the secondary routine gave us
1750 */
1751
1752 to_move = outsize2 - smb_wct;
1753
1754 if (to_move + ofs + smb_wct + chain_size > max_send) {
1755 smb_panic("replies too large -- would have to cut");
1756 }
1757
1758 /*
1759 * In the "new" API "outbuf" is allocated via reply_outbuf, just for
1760 * the first request in the chain. So we have to re-allocate it. In
1761 * the "old" API the only outbuf ever used is the global OutBuffer
1762 * which is always large enough.
1763 */
1764
1765 outbuf = TALLOC_REALLOC_ARRAY(NULL, outbuf, char,
1766 to_move + ofs + smb_wct);
1767 if (outbuf == NULL) {
1768 smb_panic("could not realloc outbuf");
1769 }
1770
1771 req->outbuf = (uint8 *)outbuf;
1772
1773 memmove(outbuf + smb_wct + ofs, req2->outbuf + smb_wct, to_move);
1774 memcpy(outbuf + smb_wct, caller_output, caller_outputlen);
1775
1776 /*
1777 * copy the new reply header over the old one but preserve the smb_com
1778 * field
1779 */
1780 memmove(outbuf, req2->outbuf, smb_wct);
1781 SCVAL(outbuf, smb_com, smb_com1);
1782
1783 /*
1784 * We've just copied in the whole "wct" area from the secondary
1785 * function. Fix up the chaining: com2 and the offset need to be
1786 * readjusted.
1787 */
1788
1789 SCVAL(outbuf, smb_vwv0, smb_com2);
1790 SSVAL(outbuf, smb_vwv1, chain_size + smb_wct - 4);
1791
1792 if (padding != 0) {
1793
1794 /*
1795 * Due to padding we have some uninitialized bytes after the
1796 * caller's output
1797 */
1798
1799 memset(outbuf + outsize, 0, padding);
1800 }
1801
1802 smb_setlen(outbuf, outsize2 + caller_outputlen + padding - 4);
1803
1804 /*
1805 * restore the saved data, being careful not to overwrite any data
1806 * from the reply header
1807 */
1808 memcpy(inbuf2,inbuf_saved,smb_wct);
1809
1810 SAFE_FREE(caller_output);
1811 TALLOC_FREE(req2);
1812
1813 /*
1814 * Reset the chain_size for our caller's offset calculations
1815 */
1816
1817 chain_size -= (outsize_padded - smb_wct);
1818
1819 return;
1820}
1821
1822/****************************************************************************
1823 Setup the needed select timeout in milliseconds.
1824****************************************************************************/
1825
1826static int setup_select_timeout(void)
1827{
1828 int select_timeout;
1829
1830 select_timeout = SMBD_SELECT_TIMEOUT*1000;
1831
1832 if (print_notify_messages_pending()) {
1833 select_timeout = MIN(select_timeout, 1000);
1834 }
1835
1836 return select_timeout;
1837}
1838
1839/****************************************************************************
1840 Check if services need reloading.
1841****************************************************************************/
1842
1843void check_reload(time_t t)
1844{
1845 static pid_t mypid = 0;
1846 static time_t last_smb_conf_reload_time = 0;
1847 static time_t last_printer_reload_time = 0;
1848 time_t printcap_cache_time = (time_t)lp_printcap_cache_time();
1849
1850 if(last_smb_conf_reload_time == 0) {
1851 last_smb_conf_reload_time = t;
1852 /* Our printing subsystem might not be ready at smbd start up.
1853 Then no printer is available till the first printers check
1854 is performed. A lower initial interval circumvents this. */
1855 if ( printcap_cache_time > 60 )
1856 last_printer_reload_time = t - printcap_cache_time + 60;
1857 else
1858 last_printer_reload_time = t;
1859 }
1860
1861 if (mypid != getpid()) { /* First time or fork happened meanwhile */
1862 /* randomize over 60 second the printcap reload to avoid all
1863 * process hitting cupsd at the same time */
1864 int time_range = 60;
1865
1866 last_printer_reload_time += random() % time_range;
1867 mypid = getpid();
1868 }
1869
1870 if (reload_after_sighup || (t >= last_smb_conf_reload_time+SMBD_RELOAD_CHECK)) {
1871 reload_services(True);
1872 reload_after_sighup = False;
1873 last_smb_conf_reload_time = t;
1874 }
1875
1876 /* 'printcap cache time = 0' disable the feature */
1877
1878 if ( printcap_cache_time != 0 )
1879 {
1880 /* see if it's time to reload or if the clock has been set back */
1881
1882 if ( (t >= last_printer_reload_time+printcap_cache_time)
1883 || (t-last_printer_reload_time < 0) )
1884 {
1885 DEBUG( 3,( "Printcap cache time expired.\n"));
1886 reload_printers();
1887 last_printer_reload_time = t;
1888 }
1889 }
1890}
1891
1892/****************************************************************************
1893 Process any timeout housekeeping. Return False if the caller should exit.
1894****************************************************************************/
1895
1896static void timeout_processing(int *select_timeout,
1897 time_t *last_timeout_processing_time)
1898{
1899 time_t t;
1900
1901 *last_timeout_processing_time = t = time(NULL);
1902
1903 /* become root again if waiting */
1904 change_to_root_user();
1905
1906 /* check if we need to reload services */
1907 check_reload(t);
1908
1909 if(global_machine_password_needs_changing &&
1910 /* for ADS we need to do a regular ADS password change, not a domain
1911 password change */
1912 lp_security() == SEC_DOMAIN) {
1913
1914 unsigned char trust_passwd_hash[16];
1915 time_t lct;
1916 void *lock;
1917
1918 /*
1919 * We're in domain level security, and the code that
1920 * read the machine password flagged that the machine
1921 * password needs changing.
1922 */
1923
1924 /*
1925 * First, open the machine password file with an exclusive lock.
1926 */
1927
1928 lock = secrets_get_trust_account_lock(NULL, lp_workgroup());
1929
1930 if (lock == NULL) {
1931 DEBUG(0,("process: unable to lock the machine account password for \
1932machine %s in domain %s.\n", global_myname(), lp_workgroup() ));
1933 return;
1934 }
1935
1936 if(!secrets_fetch_trust_account_password(lp_workgroup(), trust_passwd_hash, &lct, NULL)) {
1937 DEBUG(0,("process: unable to read the machine account password for \
1938machine %s in domain %s.\n", global_myname(), lp_workgroup()));
1939 TALLOC_FREE(lock);
1940 return;
1941 }
1942
1943 /*
1944 * Make sure someone else hasn't already done this.
1945 */
1946
1947 if(t < lct + lp_machine_password_timeout()) {
1948 global_machine_password_needs_changing = False;
1949 TALLOC_FREE(lock);
1950 return;
1951 }
1952
1953 /* always just contact the PDC here */
1954
1955 change_trust_account_password( lp_workgroup(), NULL);
1956 global_machine_password_needs_changing = False;
1957 TALLOC_FREE(lock);
1958 }
1959
1960 /* update printer queue caches if necessary */
1961
1962 update_monitored_printq_cache();
1963
1964 /*
1965 * Now we are root, check if the log files need pruning.
1966 * Force a log file check.
1967 */
1968 force_check_log_size();
1969 check_log_size();
1970
1971 /* Send any queued printer notify message to interested smbd's. */
1972
1973 print_notify_send_messages(smbd_messaging_context(), 0);
1974
1975 /*
1976 * Modify the select timeout depending upon
1977 * what we have remaining in our queues.
1978 */
1979
1980 *select_timeout = setup_select_timeout();
1981
1982 return;
1983}
1984
1985/****************************************************************************
1986 Process commands from the client
1987****************************************************************************/
1988
1989void smbd_process(void)
1990{
1991 time_t last_timeout_processing_time = time(NULL);
1992 unsigned int num_smbs = 0;
1993 size_t unread_bytes = 0;
1994
1995 max_recv = MIN(lp_maxxmit(),BUFFER_SIZE);
1996
1997 while (True) {
1998 int select_timeout = setup_select_timeout();
1999 int num_echos;
2000 char *inbuf = NULL;
2001 size_t inbuf_len = 0;
2002 bool encrypted = false;
2003 TALLOC_CTX *frame = talloc_stackframe_pool(8192);
2004
2005 errno = 0;
2006
2007 /* Did someone ask for immediate checks on things like blocking locks ? */
2008 if (select_timeout == 0) {
2009 timeout_processing(&select_timeout,
2010 &last_timeout_processing_time);
2011 num_smbs = 0; /* Reset smb counter. */
2012 }
2013
2014 run_events(smbd_event_context(), 0, NULL, NULL);
2015
2016 while (True) {
2017 NTSTATUS status;
2018
2019 status = receive_message_or_smb(
2020 talloc_tos(), &inbuf, &inbuf_len,
2021 select_timeout, &unread_bytes, &encrypted);
2022
2023 if (NT_STATUS_IS_OK(status)) {
2024 break;
2025 }
2026
2027 if (NT_STATUS_EQUAL(status, NT_STATUS_IO_TIMEOUT)) {
2028 timeout_processing(
2029 &select_timeout,
2030 &last_timeout_processing_time);
2031 continue;
2032 }
2033
2034 DEBUG(3, ("receive_message_or_smb failed: %s, "
2035 "exiting\n", nt_errstr(status)));
2036 return;
2037
2038 num_smbs = 0; /* Reset smb counter. */
2039 }
2040
2041
2042 /*
2043 * Ensure we do timeout processing if the SMB we just got was
2044 * only an echo request. This allows us to set the select
2045 * timeout in 'receive_message_or_smb()' to any value we like
2046 * without worrying that the client will send echo requests
2047 * faster than the select timeout, thus starving out the
2048 * essential processing (change notify, blocking locks) that
2049 * the timeout code does. JRA.
2050 */
2051 num_echos = smb_echo_count;
2052
2053 process_smb(inbuf, inbuf_len, unread_bytes, encrypted);
2054
2055 TALLOC_FREE(inbuf);
2056
2057 if (smb_echo_count != num_echos) {
2058 timeout_processing(&select_timeout,
2059 &last_timeout_processing_time);
2060 num_smbs = 0; /* Reset smb counter. */
2061 }
2062
2063 num_smbs++;
2064
2065 /*
2066 * If we are getting smb requests in a constant stream
2067 * with no echos, make sure we attempt timeout processing
2068 * every select_timeout milliseconds - but only check for this
2069 * every 200 smb requests.
2070 */
2071
2072 if ((num_smbs % 200) == 0) {
2073 time_t new_check_time = time(NULL);
2074 if(new_check_time - last_timeout_processing_time >= (select_timeout/1000)) {
2075 timeout_processing(
2076 &select_timeout,
2077 &last_timeout_processing_time);
2078 num_smbs = 0; /* Reset smb counter. */
2079 last_timeout_processing_time = new_check_time; /* Reset time. */
2080 }
2081 }
2082
2083 /* The timeout_processing function isn't run nearly
2084 often enough to implement 'max log size' without
2085 overrunning the size of the file by many megabytes.
2086 This is especially true if we are running at debug
2087 level 10. Checking every 50 SMBs is a nice
2088 tradeoff of performance vs log file size overrun. */
2089
2090 if ((num_smbs % 50) == 0 && need_to_check_log_size()) {
2091 change_to_root_user();
2092 check_log_size();
2093 }
2094 TALLOC_FREE(frame);
2095 }
2096}
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