source: branches/samba-3.3.x/source/smbd/process.c@ 310

Last change on this file since 310 was 223, checked in by Herwig Bauernfeind, 16 years ago

Update Samba 3.3 branch to 3.3.3
File size: 56.2 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 /*
109 * This used to be (strncmp(smb_base(inbuf),"\377SMB",4) == 0)
110 * but it just looks weird to call strncmp for this one.
111 */
112 return (IVAL(smb_base(inbuf), 0) == 0x424D53FF);
113}
114
115/* Socket functions for smbd packet processing. */
116
117static bool valid_packet_size(size_t len)
118{
119 /*
120 * A WRITEX with CAP_LARGE_WRITEX can be 64k worth of data plus 65 bytes
121 * of header. Don't print the error if this fits.... JRA.
122 */
123
124 if (len > (BUFFER_SIZE + LARGE_WRITEX_HDR_SIZE)) {
125 DEBUG(0,("Invalid packet length! (%lu bytes).\n",
126 (unsigned long)len));
127 return false;
128 }
129 return true;
130}
131
132static NTSTATUS read_packet_remainder(int fd, char *buffer,
133 unsigned int timeout, ssize_t len)
134{
135 if (len <= 0) {
136 return NT_STATUS_OK;
137 }
138
139 return read_socket_with_timeout(fd, buffer, len, len, timeout, NULL);
140}
141
142/****************************************************************************
143 Attempt a zerocopy writeX read. We know here that len > smb_size-4
144****************************************************************************/
145
146/*
147 * Unfortunately, earlier versions of smbclient/libsmbclient
148 * don't send this "standard" writeX header. I've fixed this
149 * for 3.2 but we'll use the old method with earlier versions.
150 * Windows and CIFSFS at least use this standard size. Not
151 * sure about MacOSX.
152 */
153
154#define STANDARD_WRITE_AND_X_HEADER_SIZE (smb_size - 4 + /* basic header */ \
155 (2*14) + /* word count (including bcc) */ \
156 1 /* pad byte */)
157
158static NTSTATUS receive_smb_raw_talloc_partial_read(TALLOC_CTX *mem_ctx,
159 const char *lenbuf,
160 int fd, char **buffer,
161 unsigned int timeout,
162 size_t *p_unread,
163 size_t *len_ret)
164{
165 /* Size of a WRITEX call (+4 byte len). */
166 char writeX_header[4 + STANDARD_WRITE_AND_X_HEADER_SIZE];
167 ssize_t len = smb_len_large(lenbuf); /* Could be a UNIX large writeX. */
168 ssize_t toread;
169 NTSTATUS status;
170
171 memcpy(writeX_header, lenbuf, 4);
172
173 status = read_socket_with_timeout(
174 fd, writeX_header + 4,
175 STANDARD_WRITE_AND_X_HEADER_SIZE,
176 STANDARD_WRITE_AND_X_HEADER_SIZE,
177 timeout, NULL);
178
179 if (!NT_STATUS_IS_OK(status)) {
180 return status;
181 }
182
183 /*
184 * Ok - now try and see if this is a possible
185 * valid writeX call.
186 */
187
188 if (is_valid_writeX_buffer((uint8_t *)writeX_header)) {
189 /*
190 * If the data offset is beyond what
191 * we've read, drain the extra bytes.
192 */
193 uint16_t doff = SVAL(writeX_header,smb_vwv11);
194 ssize_t newlen;
195
196 if (doff > STANDARD_WRITE_AND_X_HEADER_SIZE) {
197 size_t drain = doff - STANDARD_WRITE_AND_X_HEADER_SIZE;
198 if (drain_socket(smbd_server_fd(), drain) != drain) {
199 smb_panic("receive_smb_raw_talloc_partial_read:"
200 " failed to drain pending bytes");
201 }
202 } else {
203 doff = STANDARD_WRITE_AND_X_HEADER_SIZE;
204 }
205
206 /* Spoof down the length and null out the bcc. */
207 set_message_bcc(writeX_header, 0);
208 newlen = smb_len(writeX_header);
209
210 /* Copy the header we've written. */
211
212 *buffer = (char *)TALLOC_MEMDUP(mem_ctx,
213 writeX_header,
214 sizeof(writeX_header));
215
216 if (*buffer == NULL) {
217 DEBUG(0, ("Could not allocate inbuf of length %d\n",
218 (int)sizeof(writeX_header)));
219 return NT_STATUS_NO_MEMORY;
220 }
221
222 /* Work out the remaining bytes. */
223 *p_unread = len - STANDARD_WRITE_AND_X_HEADER_SIZE;
224 *len_ret = newlen + 4;
225 return NT_STATUS_OK;
226 }
227
228 if (!valid_packet_size(len)) {
229 return NT_STATUS_INVALID_PARAMETER;
230 }
231
232 /*
233 * Not a valid writeX call. Just do the standard
234 * talloc and return.
235 */
236
237 *buffer = TALLOC_ARRAY(mem_ctx, char, len+4);
238
239 if (*buffer == NULL) {
240 DEBUG(0, ("Could not allocate inbuf of length %d\n",
241 (int)len+4));
242 return NT_STATUS_NO_MEMORY;
243 }
244
245 /* Copy in what we already read. */
246 memcpy(*buffer,
247 writeX_header,
248 4 + STANDARD_WRITE_AND_X_HEADER_SIZE);
249 toread = len - STANDARD_WRITE_AND_X_HEADER_SIZE;
250
251 if(toread > 0) {
252 status = read_packet_remainder(
253 fd, (*buffer) + 4 + STANDARD_WRITE_AND_X_HEADER_SIZE,
254 timeout, toread);
255
256 if (!NT_STATUS_IS_OK(status)) {
257 DEBUG(10, ("receive_smb_raw_talloc_partial_read: %s\n",
258 nt_errstr(status)));
259 return status;
260 }
261 }
262
263 *len_ret = len + 4;
264 return NT_STATUS_OK;
265}
266
267static NTSTATUS receive_smb_raw_talloc(TALLOC_CTX *mem_ctx, int fd,
268 char **buffer, unsigned int timeout,
269 size_t *p_unread, size_t *plen)
270{
271 char lenbuf[4];
272 size_t len;
273 int min_recv_size = lp_min_receive_file_size();
274 NTSTATUS status;
275
276 *p_unread = 0;
277
278 status = read_smb_length_return_keepalive(fd, lenbuf, timeout, &len);
279 if (!NT_STATUS_IS_OK(status)) {
280 DEBUG(10, ("receive_smb_raw: %s\n", nt_errstr(status)));
281 return status;
282 }
283
284 if (CVAL(lenbuf,0) == 0 &&
285 min_recv_size &&
286 smb_len_large(lenbuf) > (min_recv_size + STANDARD_WRITE_AND_X_HEADER_SIZE) && /* Could be a UNIX large writeX. */
287 !srv_is_signing_active()) {
288
289 return receive_smb_raw_talloc_partial_read(
290 mem_ctx, lenbuf, fd, buffer, timeout, p_unread, plen);
291 }
292
293 if (!valid_packet_size(len)) {
294 return NT_STATUS_INVALID_PARAMETER;
295 }
296
297 /*
298 * The +4 here can't wrap, we've checked the length above already.
299 */
300
301 *buffer = TALLOC_ARRAY(mem_ctx, char, len+4);
302
303 if (*buffer == NULL) {
304 DEBUG(0, ("Could not allocate inbuf of length %d\n",
305 (int)len+4));
306 return NT_STATUS_NO_MEMORY;
307 }
308
309 memcpy(*buffer, lenbuf, sizeof(lenbuf));
310
311 status = read_packet_remainder(fd, (*buffer)+4, timeout, len);
312 if (!NT_STATUS_IS_OK(status)) {
313 return status;
314 }
315
316 *plen = len + 4;
317 return NT_STATUS_OK;
318}
319
320static NTSTATUS receive_smb_talloc(TALLOC_CTX *mem_ctx, int fd,
321 char **buffer, unsigned int timeout,
322 size_t *p_unread, bool *p_encrypted,
323 size_t *p_len)
324{
325 size_t len = 0;
326 NTSTATUS status;
327
328 *p_encrypted = false;
329
330 status = receive_smb_raw_talloc(mem_ctx, fd, buffer, timeout,
331 p_unread, &len);
332 if (!NT_STATUS_IS_OK(status)) {
333 return status;
334 }
335
336 if (is_encrypted_packet((uint8_t *)*buffer)) {
337 status = srv_decrypt_buffer(*buffer);
338 if (!NT_STATUS_IS_OK(status)) {
339 DEBUG(0, ("receive_smb_talloc: SMB decryption failed on "
340 "incoming packet! Error %s\n",
341 nt_errstr(status) ));
342 return status;
343 }
344 *p_encrypted = true;
345 }
346
347 /* Check the incoming SMB signature. */
348 if (!srv_check_sign_mac(*buffer, true)) {
349 DEBUG(0, ("receive_smb: SMB Signature verification failed on "
350 "incoming packet!\n"));
351 return NT_STATUS_INVALID_NETWORK_RESPONSE;
352 }
353
354 *p_len = len;
355 return NT_STATUS_OK;
356}
357
358/*
359 * Initialize a struct smb_request from an inbuf
360 */
361
362void init_smb_request(struct smb_request *req,
363 const uint8 *inbuf,
364 size_t unread_bytes,
365 bool encrypted)
366{
367 size_t req_size = smb_len(inbuf) + 4;
368 /* Ensure we have at least smb_size bytes. */
369 if (req_size < smb_size) {
370 DEBUG(0,("init_smb_request: invalid request size %u\n",
371 (unsigned int)req_size ));
372 exit_server_cleanly("Invalid SMB request");
373 }
374 req->flags2 = SVAL(inbuf, smb_flg2);
375 req->smbpid = SVAL(inbuf, smb_pid);
376 req->mid = SVAL(inbuf, smb_mid);
377 req->vuid = SVAL(inbuf, smb_uid);
378 req->tid = SVAL(inbuf, smb_tid);
379 req->wct = CVAL(inbuf, smb_wct);
380 req->unread_bytes = unread_bytes;
381 req->encrypted = encrypted;
382 req->conn = conn_find(req->tid);
383
384 /* Ensure we have at least wct words and 2 bytes of bcc. */
385 if (smb_size + req->wct*2 > req_size) {
386 DEBUG(0,("init_smb_request: invalid wct number %u (size %u)\n",
387 (unsigned int)req->wct,
388 (unsigned int)req_size));
389 exit_server_cleanly("Invalid SMB request");
390 }
391 /* Ensure bcc is correct. */
392 if (((uint8 *)smb_buf(inbuf)) + smb_buflen(inbuf) > inbuf + req_size) {
393 DEBUG(0,("init_smb_request: invalid bcc number %u "
394 "(wct = %u, size %u)\n",
395 (unsigned int)smb_buflen(inbuf),
396 (unsigned int)req->wct,
397 (unsigned int)req_size));
398 exit_server_cleanly("Invalid SMB request");
399 }
400 req->inbuf = inbuf;
401 req->outbuf = NULL;
402}
403
404/****************************************************************************
405 structure to hold a linked list of queued messages.
406 for processing.
407****************************************************************************/
408
409static struct pending_message_list *deferred_open_queue;
410
411/****************************************************************************
412 Function to push a message onto the tail of a linked list of smb messages ready
413 for processing.
414****************************************************************************/
415
416static bool push_queued_message(struct smb_request *req,
417 struct timeval request_time,
418 struct timeval end_time,
419 char *private_data, size_t private_len)
420{
421 int msg_len = smb_len(req->inbuf) + 4;
422 struct pending_message_list *msg;
423
424 msg = TALLOC_ZERO_P(NULL, struct pending_message_list);
425
426 if(msg == NULL) {
427 DEBUG(0,("push_message: malloc fail (1)\n"));
428 return False;
429 }
430
431 msg->buf = data_blob_talloc(msg, req->inbuf, msg_len);
432 if(msg->buf.data == NULL) {
433 DEBUG(0,("push_message: malloc fail (2)\n"));
434 TALLOC_FREE(msg);
435 return False;
436 }
437
438 msg->request_time = request_time;
439 msg->end_time = end_time;
440 msg->encrypted = req->encrypted;
441
442 if (private_data) {
443 msg->private_data = data_blob_talloc(msg, private_data,
444 private_len);
445 if (msg->private_data.data == NULL) {
446 DEBUG(0,("push_message: malloc fail (3)\n"));
447 TALLOC_FREE(msg);
448 return False;
449 }
450 }
451
452 DLIST_ADD_END(deferred_open_queue, msg, struct pending_message_list *);
453
454 DEBUG(10,("push_message: pushed message length %u on "
455 "deferred_open_queue\n", (unsigned int)msg_len));
456
457 return True;
458}
459
460/****************************************************************************
461 Function to delete a sharing violation open message by mid.
462****************************************************************************/
463
464void remove_deferred_open_smb_message(uint16 mid)
465{
466 struct pending_message_list *pml;
467
468 for (pml = deferred_open_queue; pml; pml = pml->next) {
469 if (mid == SVAL(pml->buf.data,smb_mid)) {
470 DEBUG(10,("remove_sharing_violation_open_smb_message: "
471 "deleting mid %u len %u\n",
472 (unsigned int)mid,
473 (unsigned int)pml->buf.length ));
474 DLIST_REMOVE(deferred_open_queue, pml);
475 TALLOC_FREE(pml);
476 return;
477 }
478 }
479}
480
481/****************************************************************************
482 Move a sharing violation open retry message to the front of the list and
483 schedule it for immediate processing.
484****************************************************************************/
485
486void schedule_deferred_open_smb_message(uint16 mid)
487{
488 struct pending_message_list *pml;
489 int i = 0;
490
491 for (pml = deferred_open_queue; pml; pml = pml->next) {
492 uint16 msg_mid = SVAL(pml->buf.data,smb_mid);
493 DEBUG(10,("schedule_deferred_open_smb_message: [%d] msg_mid = %u\n", i++,
494 (unsigned int)msg_mid ));
495 if (mid == msg_mid) {
496 DEBUG(10,("schedule_deferred_open_smb_message: scheduling mid %u\n",
497 mid ));
498 pml->end_time.tv_sec = 0;
499 pml->end_time.tv_usec = 0;
500 DLIST_PROMOTE(deferred_open_queue, pml);
501 return;
502 }
503 }
504
505 DEBUG(10,("schedule_deferred_open_smb_message: failed to find message mid %u\n",
506 mid ));
507}
508
509/****************************************************************************
510 Return true if this mid is on the deferred queue.
511****************************************************************************/
512
513bool open_was_deferred(uint16 mid)
514{
515 struct pending_message_list *pml;
516
517 for (pml = deferred_open_queue; pml; pml = pml->next) {
518 if (SVAL(pml->buf.data,smb_mid) == mid) {
519 return True;
520 }
521 }
522 return False;
523}
524
525/****************************************************************************
526 Return the message queued by this mid.
527****************************************************************************/
528
529struct pending_message_list *get_open_deferred_message(uint16 mid)
530{
531 struct pending_message_list *pml;
532
533 for (pml = deferred_open_queue; pml; pml = pml->next) {
534 if (SVAL(pml->buf.data,smb_mid) == mid) {
535 return pml;
536 }
537 }
538 return NULL;
539}
540
541/****************************************************************************
542 Function to push a deferred open smb message onto a linked list of local smb
543 messages ready for processing.
544****************************************************************************/
545
546bool push_deferred_smb_message(struct smb_request *req,
547 struct timeval request_time,
548 struct timeval timeout,
549 char *private_data, size_t priv_len)
550{
551 struct timeval end_time;
552
553 if (req->unread_bytes) {
554 DEBUG(0,("push_deferred_smb_message: logic error ! "
555 "unread_bytes = %u\n",
556 (unsigned int)req->unread_bytes ));
557 smb_panic("push_deferred_smb_message: "
558 "logic error unread_bytes != 0" );
559 }
560
561 end_time = timeval_sum(&request_time, &timeout);
562
563 DEBUG(10,("push_deferred_open_smb_message: pushing message len %u mid %u "
564 "timeout time [%u.%06u]\n",
565 (unsigned int) smb_len(req->inbuf)+4, (unsigned int)req->mid,
566 (unsigned int)end_time.tv_sec,
567 (unsigned int)end_time.tv_usec));
568
569 return push_queued_message(req, request_time, end_time,
570 private_data, priv_len);
571}
572
573struct idle_event {
574 struct timed_event *te;
575 struct timeval interval;
576 char *name;
577 bool (*handler)(const struct timeval *now, void *private_data);
578 void *private_data;
579};
580
581static void smbd_idle_event_handler(struct event_context *ctx,
582 struct timed_event *te,
583 struct timeval now,
584 void *private_data)
585{
586 struct idle_event *event =
587 talloc_get_type_abort(private_data, struct idle_event);
588
589 TALLOC_FREE(event->te);
590
591 DEBUG(10,("smbd_idle_event_handler: %s %p called\n",
592 event->name, event->te));
593
594 if (!event->handler(&now, event->private_data)) {
595 DEBUG(10,("smbd_idle_event_handler: %s %p stopped\n",
596 event->name, event->te));
597 /* Don't repeat, delete ourselves */
598 TALLOC_FREE(event);
599 return;
600 }
601
602 DEBUG(10,("smbd_idle_event_handler: %s %p rescheduled\n",
603 event->name, event->te));
604
605 event->te = event_add_timed(ctx, event,
606 timeval_sum(&now, &event->interval),
607 smbd_idle_event_handler, event);
608
609 /* We can't do much but fail here. */
610 SMB_ASSERT(event->te != NULL);
611}
612
613struct idle_event *event_add_idle(struct event_context *event_ctx,
614 TALLOC_CTX *mem_ctx,
615 struct timeval interval,
616 const char *name,
617 bool (*handler)(const struct timeval *now,
618 void *private_data),
619 void *private_data)
620{
621 struct idle_event *result;
622 struct timeval now = timeval_current();
623
624 result = TALLOC_P(mem_ctx, struct idle_event);
625 if (result == NULL) {
626 DEBUG(0, ("talloc failed\n"));
627 return NULL;
628 }
629
630 result->interval = interval;
631 result->handler = handler;
632 result->private_data = private_data;
633
634 if (!(result->name = talloc_asprintf(result, "idle_evt(%s)", name))) {
635 DEBUG(0, ("talloc failed\n"));
636 TALLOC_FREE(result);
637 return NULL;
638 }
639
640 result->te = event_add_timed(event_ctx, result,
641 timeval_sum(&now, &interval),
642 smbd_idle_event_handler, result);
643 if (result->te == NULL) {
644 DEBUG(0, ("event_add_timed failed\n"));
645 TALLOC_FREE(result);
646 return NULL;
647 }
648
649 DEBUG(10,("event_add_idle: %s %p\n", result->name, result->te));
650 return result;
651}
652
653/****************************************************************************
654 Do all async processing in here. This includes kernel oplock messages, change
655 notify events etc.
656****************************************************************************/
657
658static void async_processing(fd_set *pfds)
659{
660 DEBUG(10,("async_processing: Doing async processing.\n"));
661
662 process_aio_queue();
663
664 process_kernel_oplocks(smbd_messaging_context(), pfds);
665
666 /* Do the aio check again after receive_local_message as it does a
667 select and may have eaten our signal. */
668 /* Is this till true? -- vl */
669 process_aio_queue();
670
671 if (got_sig_term) {
672 exit_server_cleanly("termination signal");
673 }
674
675 /* check for sighup processing */
676 if (reload_after_sighup) {
677 change_to_root_user();
678 DEBUG(1,("Reloading services after SIGHUP\n"));
679 reload_services(False);
680 reload_after_sighup = 0;
681 }
682}
683
684/****************************************************************************
685 Add a fd to the set we will be select(2)ing on.
686****************************************************************************/
687
688static int select_on_fd(int fd, int maxfd, fd_set *fds)
689{
690 if (fd != -1) {
691 FD_SET(fd, fds);
692 maxfd = MAX(maxfd, fd);
693 }
694
695 return maxfd;
696}
697
698/****************************************************************************
699 Do a select on an two fd's - with timeout.
700
701 If a local udp message has been pushed onto the
702 queue (this can only happen during oplock break
703 processing) call async_processing()
704
705 If a pending smb message has been pushed onto the
706 queue (this can only happen during oplock break
707 processing) return this next.
708
709 If the first smbfd is ready then read an smb from it.
710 if the second (loopback UDP) fd is ready then read a message
711 from it and setup the buffer header to identify the length
712 and from address.
713 Returns False on timeout or error.
714 Else returns True.
715
716The timeout is in milliseconds
717****************************************************************************/
718
719static NTSTATUS receive_message_or_smb(TALLOC_CTX *mem_ctx, char **buffer,
720 size_t *buffer_len,
721 size_t *p_unread, bool *p_encrypted)
722{
723 fd_set r_fds, w_fds;
724 int selrtn;
725 struct timeval to;
726 int maxfd = 0;
727 size_t len = 0;
728 NTSTATUS status;
729
730 *p_unread = 0;
731
732 again:
733
734 to.tv_sec = SMBD_SELECT_TIMEOUT;
735 to.tv_usec = 0;
736
737 /*
738 * Note that this call must be before processing any SMB
739 * messages as we need to synchronously process any messages
740 * we may have sent to ourselves from the previous SMB.
741 */
742 message_dispatch(smbd_messaging_context());
743
744 /*
745 * Check to see if we already have a message on the deferred open queue
746 * and it's time to schedule.
747 */
748 if(deferred_open_queue != NULL) {
749 bool pop_message = False;
750 struct pending_message_list *msg = deferred_open_queue;
751
752 if (timeval_is_zero(&msg->end_time)) {
753 pop_message = True;
754 } else {
755 struct timeval tv;
756 SMB_BIG_INT tdif;
757
758 GetTimeOfDay(&tv);
759 tdif = usec_time_diff(&msg->end_time, &tv);
760 if (tdif <= 0) {
761 /* Timed out. Schedule...*/
762 pop_message = True;
763 DEBUG(10,("receive_message_or_smb: queued message timed out.\n"));
764 } else {
765 /* Make a more accurate select timeout. */
766 to.tv_sec = tdif / 1000000;
767 to.tv_usec = tdif % 1000000;
768 DEBUG(10,("receive_message_or_smb: select with timeout of [%u.%06u]\n",
769 (unsigned int)to.tv_sec, (unsigned int)to.tv_usec ));
770 }
771 }
772
773 if (pop_message) {
774
775 *buffer = (char *)talloc_memdup(mem_ctx, msg->buf.data,
776 msg->buf.length);
777 if (*buffer == NULL) {
778 DEBUG(0, ("talloc failed\n"));
779 return NT_STATUS_NO_MEMORY;
780 }
781 *buffer_len = msg->buf.length;
782 *p_encrypted = msg->encrypted;
783
784 /* We leave this message on the queue so the open code can
785 know this is a retry. */
786 DEBUG(5,("receive_message_or_smb: returning deferred open smb message.\n"));
787 return NT_STATUS_OK;
788 }
789 }
790
791 /*
792 * Setup the select fd sets.
793 */
794
795 FD_ZERO(&r_fds);
796 FD_ZERO(&w_fds);
797
798 /*
799 * Ensure we process oplock break messages by preference.
800 * We have to do this before the select, after the select
801 * and if the select returns EINTR. This is due to the fact
802 * that the selects called from async_processing can eat an EINTR
803 * caused by a signal (we can't take the break message there).
804 * This is hideously complex - *MUST* be simplified for 3.0 ! JRA.
805 */
806
807 if (oplock_message_waiting(&r_fds)) {
808 DEBUG(10,("receive_message_or_smb: oplock_message is waiting.\n"));
809 async_processing(&r_fds);
810 /*
811 * After async processing we must go and do the select again, as
812 * the state of the flag in fds for the server file descriptor is
813 * indeterminate - we may have done I/O on it in the oplock processing. JRA.
814 */
815 goto again;
816 }
817
818 /*
819 * Are there any timed events waiting ? If so, ensure we don't
820 * select for longer than it would take to wait for them.
821 */
822
823 {
824 struct timeval now;
825 GetTimeOfDay(&now);
826
827 event_add_to_select_args(smbd_event_context(), &now,
828 &r_fds, &w_fds, &to, &maxfd);
829 }
830
831 if (timeval_is_zero(&to)) {
832 /* Process a timed event now... */
833 if (run_events(smbd_event_context(), 0, NULL, NULL)) {
834 goto again;
835 }
836 }
837
838 {
839 int sav;
840 START_PROFILE(smbd_idle);
841
842 maxfd = select_on_fd(smbd_server_fd(), maxfd, &r_fds);
843 maxfd = select_on_fd(oplock_notify_fd(), maxfd, &r_fds);
844
845 selrtn = sys_select(maxfd+1,&r_fds,&w_fds,NULL,&to);
846 sav = errno;
847
848 END_PROFILE(smbd_idle);
849 errno = sav;
850 }
851
852 if (run_events(smbd_event_context(), selrtn, &r_fds, &w_fds)) {
853 goto again;
854 }
855
856 /* if we get EINTR then maybe we have received an oplock
857 signal - treat this as select returning 1. This is ugly, but
858 is the best we can do until the oplock code knows more about
859 signals */
860 if (selrtn == -1 && errno == EINTR) {
861 async_processing(&r_fds);
862 /*
863 * After async processing we must go and do the select again, as
864 * the state of the flag in fds for the server file descriptor is
865 * indeterminate - we may have done I/O on it in the oplock processing. JRA.
866 */
867 goto again;
868 }
869
870 /* Check if error */
871 if (selrtn == -1) {
872 /* something is wrong. Maybe the socket is dead? */
873 return map_nt_error_from_unix(errno);
874 }
875
876 /* Did we timeout ? */
877 if (selrtn == 0) {
878 goto again;
879 }
880
881 /*
882 * Ensure we process oplock break messages by preference.
883 * This is IMPORTANT ! Otherwise we can starve other processes
884 * sending us an oplock break message. JRA.
885 */
886
887 if (oplock_message_waiting(&r_fds)) {
888 async_processing(&r_fds);
889 /*
890 * After async processing we must go and do the select again, as
891 * the state of the flag in fds for the server file descriptor is
892 * indeterminate - we may have done I/O on it in the oplock processing. JRA.
893 */
894 goto again;
895 }
896
897 /*
898 * We've just woken up from a protentially long select sleep.
899 * Ensure we process local messages as we need to synchronously
900 * process any messages from other smbd's to avoid file rename race
901 * conditions. This call is cheap if there are no messages waiting.
902 * JRA.
903 */
904 message_dispatch(smbd_messaging_context());
905
906 status = receive_smb_talloc(mem_ctx, smbd_server_fd(), buffer, 0,
907 p_unread, p_encrypted, &len);
908
909 if (!NT_STATUS_IS_OK(status)) {
910 return status;
911 }
912
913 *buffer_len = len;
914
915 return NT_STATUS_OK;
916}
917
918/*
919 * Only allow 5 outstanding trans requests. We're allocating memory, so
920 * prevent a DoS.
921 */
922
923NTSTATUS allow_new_trans(struct trans_state *list, int mid)
924{
925 int count = 0;
926 for (; list != NULL; list = list->next) {
927
928 if (list->mid == mid) {
929 return NT_STATUS_INVALID_PARAMETER;
930 }
931
932 count += 1;
933 }
934 if (count > 5) {
935 return NT_STATUS_INSUFFICIENT_RESOURCES;
936 }
937
938 return NT_STATUS_OK;
939}
940
941/****************************************************************************
942 We're terminating and have closed all our files/connections etc.
943 If there are any pending local messages we need to respond to them
944 before termination so that other smbds don't think we just died whilst
945 holding oplocks.
946****************************************************************************/
947
948void respond_to_all_remaining_local_messages(void)
949{
950 /*
951 * Assert we have no exclusive open oplocks.
952 */
953
954 if(get_number_of_exclusive_open_oplocks()) {
955 DEBUG(0,("respond_to_all_remaining_local_messages: PANIC : we have %d exclusive oplocks.\n",
956 get_number_of_exclusive_open_oplocks() ));
957 return;
958 }
959
960 process_kernel_oplocks(smbd_messaging_context(), NULL);
961
962 return;
963}
964
965
966/*
967These flags determine some of the permissions required to do an operation
968
969Note that I don't set NEED_WRITE on some write operations because they
970are used by some brain-dead clients when printing, and I don't want to
971force write permissions on print services.
972*/
973#define AS_USER (1<<0)
974#define NEED_WRITE (1<<1) /* Must be paired with AS_USER */
975#define TIME_INIT (1<<2)
976#define CAN_IPC (1<<3) /* Must be paired with AS_USER */
977#define AS_GUEST (1<<5) /* Must *NOT* be paired with AS_USER */
978#define DO_CHDIR (1<<6)
979
980/*
981 define a list of possible SMB messages and their corresponding
982 functions. Any message that has a NULL function is unimplemented -
983 please feel free to contribute implementations!
984*/
985static const struct smb_message_struct {
986 const char *name;
987 void (*fn)(struct smb_request *req);
988 int flags;
989} smb_messages[256] = {
990
991/* 0x00 */ { "SMBmkdir",reply_mkdir,AS_USER | NEED_WRITE},
992/* 0x01 */ { "SMBrmdir",reply_rmdir,AS_USER | NEED_WRITE},
993/* 0x02 */ { "SMBopen",reply_open,AS_USER },
994/* 0x03 */ { "SMBcreate",reply_mknew,AS_USER},
995/* 0x04 */ { "SMBclose",reply_close,AS_USER | CAN_IPC },
996/* 0x05 */ { "SMBflush",reply_flush,AS_USER},
997/* 0x06 */ { "SMBunlink",reply_unlink,AS_USER | NEED_WRITE },
998/* 0x07 */ { "SMBmv",reply_mv,AS_USER | NEED_WRITE },
999/* 0x08 */ { "SMBgetatr",reply_getatr,AS_USER},
1000/* 0x09 */ { "SMBsetatr",reply_setatr,AS_USER | NEED_WRITE},
1001/* 0x0a */ { "SMBread",reply_read,AS_USER},
1002/* 0x0b */ { "SMBwrite",reply_write,AS_USER | CAN_IPC },
1003/* 0x0c */ { "SMBlock",reply_lock,AS_USER},
1004/* 0x0d */ { "SMBunlock",reply_unlock,AS_USER},
1005/* 0x0e */ { "SMBctemp",reply_ctemp,AS_USER },
1006/* 0x0f */ { "SMBmknew",reply_mknew,AS_USER},
1007/* 0x10 */ { "SMBcheckpath",reply_checkpath,AS_USER},
1008/* 0x11 */ { "SMBexit",reply_exit,DO_CHDIR},
1009/* 0x12 */ { "SMBlseek",reply_lseek,AS_USER},
1010/* 0x13 */ { "SMBlockread",reply_lockread,AS_USER},
1011/* 0x14 */ { "SMBwriteunlock",reply_writeunlock,AS_USER},
1012/* 0x15 */ { NULL, NULL, 0 },
1013/* 0x16 */ { NULL, NULL, 0 },
1014/* 0x17 */ { NULL, NULL, 0 },
1015/* 0x18 */ { NULL, NULL, 0 },
1016/* 0x19 */ { NULL, NULL, 0 },
1017/* 0x1a */ { "SMBreadbraw",reply_readbraw,AS_USER},
1018/* 0x1b */ { "SMBreadBmpx",reply_readbmpx,AS_USER},
1019/* 0x1c */ { "SMBreadBs",reply_readbs,AS_USER },
1020/* 0x1d */ { "SMBwritebraw",reply_writebraw,AS_USER},
1021/* 0x1e */ { "SMBwriteBmpx",reply_writebmpx,AS_USER},
1022/* 0x1f */ { "SMBwriteBs",reply_writebs,AS_USER},
1023/* 0x20 */ { "SMBwritec", NULL,0},
1024/* 0x21 */ { NULL, NULL, 0 },
1025/* 0x22 */ { "SMBsetattrE",reply_setattrE,AS_USER | NEED_WRITE },
1026/* 0x23 */ { "SMBgetattrE",reply_getattrE,AS_USER },
1027/* 0x24 */ { "SMBlockingX",reply_lockingX,AS_USER },
1028/* 0x25 */ { "SMBtrans",reply_trans,AS_USER | CAN_IPC },
1029/* 0x26 */ { "SMBtranss",reply_transs,AS_USER | CAN_IPC},
1030/* 0x27 */ { "SMBioctl",reply_ioctl,0},
1031/* 0x28 */ { "SMBioctls", NULL,AS_USER},
1032/* 0x29 */ { "SMBcopy",reply_copy,AS_USER | NEED_WRITE },
1033/* 0x2a */ { "SMBmove", NULL,AS_USER | NEED_WRITE },
1034/* 0x2b */ { "SMBecho",reply_echo,0},
1035/* 0x2c */ { "SMBwriteclose",reply_writeclose,AS_USER},
1036/* 0x2d */ { "SMBopenX",reply_open_and_X,AS_USER | CAN_IPC },
1037/* 0x2e */ { "SMBreadX",reply_read_and_X,AS_USER | CAN_IPC },
1038/* 0x2f */ { "SMBwriteX",reply_write_and_X,AS_USER | CAN_IPC },
1039/* 0x30 */ { NULL, NULL, 0 },
1040/* 0x31 */ { NULL, NULL, 0 },
1041/* 0x32 */ { "SMBtrans2",reply_trans2, AS_USER | CAN_IPC },
1042/* 0x33 */ { "SMBtranss2",reply_transs2, AS_USER | CAN_IPC},
1043/* 0x34 */ { "SMBfindclose",reply_findclose,AS_USER},
1044/* 0x35 */ { "SMBfindnclose",reply_findnclose,AS_USER},
1045/* 0x36 */ { NULL, NULL, 0 },
1046/* 0x37 */ { NULL, NULL, 0 },
1047/* 0x38 */ { NULL, NULL, 0 },
1048/* 0x39 */ { NULL, NULL, 0 },
1049/* 0x3a */ { NULL, NULL, 0 },
1050/* 0x3b */ { NULL, NULL, 0 },
1051/* 0x3c */ { NULL, NULL, 0 },
1052/* 0x3d */ { NULL, NULL, 0 },
1053/* 0x3e */ { NULL, NULL, 0 },
1054/* 0x3f */ { NULL, NULL, 0 },
1055/* 0x40 */ { NULL, NULL, 0 },
1056/* 0x41 */ { NULL, NULL, 0 },
1057/* 0x42 */ { NULL, NULL, 0 },
1058/* 0x43 */ { NULL, NULL, 0 },
1059/* 0x44 */ { NULL, NULL, 0 },
1060/* 0x45 */ { NULL, NULL, 0 },
1061/* 0x46 */ { NULL, NULL, 0 },
1062/* 0x47 */ { NULL, NULL, 0 },
1063/* 0x48 */ { NULL, NULL, 0 },
1064/* 0x49 */ { NULL, NULL, 0 },
1065/* 0x4a */ { NULL, NULL, 0 },
1066/* 0x4b */ { NULL, NULL, 0 },
1067/* 0x4c */ { NULL, NULL, 0 },
1068/* 0x4d */ { NULL, NULL, 0 },
1069/* 0x4e */ { NULL, NULL, 0 },
1070/* 0x4f */ { NULL, NULL, 0 },
1071/* 0x50 */ { NULL, NULL, 0 },
1072/* 0x51 */ { NULL, NULL, 0 },
1073/* 0x52 */ { NULL, NULL, 0 },
1074/* 0x53 */ { NULL, NULL, 0 },
1075/* 0x54 */ { NULL, NULL, 0 },
1076/* 0x55 */ { NULL, NULL, 0 },
1077/* 0x56 */ { NULL, NULL, 0 },
1078/* 0x57 */ { NULL, NULL, 0 },
1079/* 0x58 */ { NULL, NULL, 0 },
1080/* 0x59 */ { NULL, NULL, 0 },
1081/* 0x5a */ { NULL, NULL, 0 },
1082/* 0x5b */ { NULL, NULL, 0 },
1083/* 0x5c */ { NULL, NULL, 0 },
1084/* 0x5d */ { NULL, NULL, 0 },
1085/* 0x5e */ { NULL, NULL, 0 },
1086/* 0x5f */ { NULL, NULL, 0 },
1087/* 0x60 */ { NULL, NULL, 0 },
1088/* 0x61 */ { NULL, NULL, 0 },
1089/* 0x62 */ { NULL, NULL, 0 },
1090/* 0x63 */ { NULL, NULL, 0 },
1091/* 0x64 */ { NULL, NULL, 0 },
1092/* 0x65 */ { NULL, NULL, 0 },
1093/* 0x66 */ { NULL, NULL, 0 },
1094/* 0x67 */ { NULL, NULL, 0 },
1095/* 0x68 */ { NULL, NULL, 0 },
1096/* 0x69 */ { NULL, NULL, 0 },
1097/* 0x6a */ { NULL, NULL, 0 },
1098/* 0x6b */ { NULL, NULL, 0 },
1099/* 0x6c */ { NULL, NULL, 0 },
1100/* 0x6d */ { NULL, NULL, 0 },
1101/* 0x6e */ { NULL, NULL, 0 },
1102/* 0x6f */ { NULL, NULL, 0 },
1103/* 0x70 */ { "SMBtcon",reply_tcon,0},
1104/* 0x71 */ { "SMBtdis",reply_tdis,DO_CHDIR},
1105/* 0x72 */ { "SMBnegprot",reply_negprot,0},
1106/* 0x73 */ { "SMBsesssetupX",reply_sesssetup_and_X,0},
1107/* 0x74 */ { "SMBulogoffX",reply_ulogoffX, 0}, /* ulogoff doesn't give a valid TID */
1108/* 0x75 */ { "SMBtconX",reply_tcon_and_X,0},
1109/* 0x76 */ { NULL, NULL, 0 },
1110/* 0x77 */ { NULL, NULL, 0 },
1111/* 0x78 */ { NULL, NULL, 0 },
1112/* 0x79 */ { NULL, NULL, 0 },
1113/* 0x7a */ { NULL, NULL, 0 },
1114/* 0x7b */ { NULL, NULL, 0 },
1115/* 0x7c */ { NULL, NULL, 0 },
1116/* 0x7d */ { NULL, NULL, 0 },
1117/* 0x7e */ { NULL, NULL, 0 },
1118/* 0x7f */ { NULL, NULL, 0 },
1119/* 0x80 */ { "SMBdskattr",reply_dskattr,AS_USER},
1120/* 0x81 */ { "SMBsearch",reply_search,AS_USER},
1121/* 0x82 */ { "SMBffirst",reply_search,AS_USER},
1122/* 0x83 */ { "SMBfunique",reply_search,AS_USER},
1123/* 0x84 */ { "SMBfclose",reply_fclose,AS_USER},
1124/* 0x85 */ { NULL, NULL, 0 },
1125/* 0x86 */ { NULL, NULL, 0 },
1126/* 0x87 */ { NULL, NULL, 0 },
1127/* 0x88 */ { NULL, NULL, 0 },
1128/* 0x89 */ { NULL, NULL, 0 },
1129/* 0x8a */ { NULL, NULL, 0 },
1130/* 0x8b */ { NULL, NULL, 0 },
1131/* 0x8c */ { NULL, NULL, 0 },
1132/* 0x8d */ { NULL, NULL, 0 },
1133/* 0x8e */ { NULL, NULL, 0 },
1134/* 0x8f */ { NULL, NULL, 0 },
1135/* 0x90 */ { NULL, NULL, 0 },
1136/* 0x91 */ { NULL, NULL, 0 },
1137/* 0x92 */ { NULL, NULL, 0 },
1138/* 0x93 */ { NULL, NULL, 0 },
1139/* 0x94 */ { NULL, NULL, 0 },
1140/* 0x95 */ { NULL, NULL, 0 },
1141/* 0x96 */ { NULL, NULL, 0 },
1142/* 0x97 */ { NULL, NULL, 0 },
1143/* 0x98 */ { NULL, NULL, 0 },
1144/* 0x99 */ { NULL, NULL, 0 },
1145/* 0x9a */ { NULL, NULL, 0 },
1146/* 0x9b */ { NULL, NULL, 0 },
1147/* 0x9c */ { NULL, NULL, 0 },
1148/* 0x9d */ { NULL, NULL, 0 },
1149/* 0x9e */ { NULL, NULL, 0 },
1150/* 0x9f */ { NULL, NULL, 0 },
1151/* 0xa0 */ { "SMBnttrans",reply_nttrans, AS_USER | CAN_IPC },
1152/* 0xa1 */ { "SMBnttranss",reply_nttranss, AS_USER | CAN_IPC },
1153/* 0xa2 */ { "SMBntcreateX",reply_ntcreate_and_X, AS_USER | CAN_IPC },
1154/* 0xa3 */ { NULL, NULL, 0 },
1155/* 0xa4 */ { "SMBntcancel",reply_ntcancel, 0 },
1156/* 0xa5 */ { "SMBntrename",reply_ntrename, AS_USER | NEED_WRITE },
1157/* 0xa6 */ { NULL, NULL, 0 },
1158/* 0xa7 */ { NULL, NULL, 0 },
1159/* 0xa8 */ { NULL, NULL, 0 },
1160/* 0xa9 */ { NULL, NULL, 0 },
1161/* 0xaa */ { NULL, NULL, 0 },
1162/* 0xab */ { NULL, NULL, 0 },
1163/* 0xac */ { NULL, NULL, 0 },
1164/* 0xad */ { NULL, NULL, 0 },
1165/* 0xae */ { NULL, NULL, 0 },
1166/* 0xaf */ { NULL, NULL, 0 },
1167/* 0xb0 */ { NULL, NULL, 0 },
1168/* 0xb1 */ { NULL, NULL, 0 },
1169/* 0xb2 */ { NULL, NULL, 0 },
1170/* 0xb3 */ { NULL, NULL, 0 },
1171/* 0xb4 */ { NULL, NULL, 0 },
1172/* 0xb5 */ { NULL, NULL, 0 },
1173/* 0xb6 */ { NULL, NULL, 0 },
1174/* 0xb7 */ { NULL, NULL, 0 },
1175/* 0xb8 */ { NULL, NULL, 0 },
1176/* 0xb9 */ { NULL, NULL, 0 },
1177/* 0xba */ { NULL, NULL, 0 },
1178/* 0xbb */ { NULL, NULL, 0 },
1179/* 0xbc */ { NULL, NULL, 0 },
1180/* 0xbd */ { NULL, NULL, 0 },
1181/* 0xbe */ { NULL, NULL, 0 },
1182/* 0xbf */ { NULL, NULL, 0 },
1183/* 0xc0 */ { "SMBsplopen",reply_printopen,AS_USER},
1184/* 0xc1 */ { "SMBsplwr",reply_printwrite,AS_USER},
1185/* 0xc2 */ { "SMBsplclose",reply_printclose,AS_USER},
1186/* 0xc3 */ { "SMBsplretq",reply_printqueue,AS_USER},
1187/* 0xc4 */ { NULL, NULL, 0 },
1188/* 0xc5 */ { NULL, NULL, 0 },
1189/* 0xc6 */ { NULL, NULL, 0 },
1190/* 0xc7 */ { NULL, NULL, 0 },
1191/* 0xc8 */ { NULL, NULL, 0 },
1192/* 0xc9 */ { NULL, NULL, 0 },
1193/* 0xca */ { NULL, NULL, 0 },
1194/* 0xcb */ { NULL, NULL, 0 },
1195/* 0xcc */ { NULL, NULL, 0 },
1196/* 0xcd */ { NULL, NULL, 0 },
1197/* 0xce */ { NULL, NULL, 0 },
1198/* 0xcf */ { NULL, NULL, 0 },
1199/* 0xd0 */ { "SMBsends",reply_sends,AS_GUEST},
1200/* 0xd1 */ { "SMBsendb", NULL,AS_GUEST},
1201/* 0xd2 */ { "SMBfwdname", NULL,AS_GUEST},
1202/* 0xd3 */ { "SMBcancelf", NULL,AS_GUEST},
1203/* 0xd4 */ { "SMBgetmac", NULL,AS_GUEST},
1204/* 0xd5 */ { "SMBsendstrt",reply_sendstrt,AS_GUEST},
1205/* 0xd6 */ { "SMBsendend",reply_sendend,AS_GUEST},
1206/* 0xd7 */ { "SMBsendtxt",reply_sendtxt,AS_GUEST},
1207/* 0xd8 */ { NULL, NULL, 0 },
1208/* 0xd9 */ { NULL, NULL, 0 },
1209/* 0xda */ { NULL, NULL, 0 },
1210/* 0xdb */ { NULL, NULL, 0 },
1211/* 0xdc */ { NULL, NULL, 0 },
1212/* 0xdd */ { NULL, NULL, 0 },
1213/* 0xde */ { NULL, NULL, 0 },
1214/* 0xdf */ { NULL, NULL, 0 },
1215/* 0xe0 */ { NULL, NULL, 0 },
1216/* 0xe1 */ { NULL, NULL, 0 },
1217/* 0xe2 */ { NULL, NULL, 0 },
1218/* 0xe3 */ { NULL, NULL, 0 },
1219/* 0xe4 */ { NULL, NULL, 0 },
1220/* 0xe5 */ { NULL, NULL, 0 },
1221/* 0xe6 */ { NULL, NULL, 0 },
1222/* 0xe7 */ { NULL, NULL, 0 },
1223/* 0xe8 */ { NULL, NULL, 0 },
1224/* 0xe9 */ { NULL, NULL, 0 },
1225/* 0xea */ { NULL, NULL, 0 },
1226/* 0xeb */ { NULL, NULL, 0 },
1227/* 0xec */ { NULL, NULL, 0 },
1228/* 0xed */ { NULL, NULL, 0 },
1229/* 0xee */ { NULL, NULL, 0 },
1230/* 0xef */ { NULL, NULL, 0 },
1231/* 0xf0 */ { NULL, NULL, 0 },
1232/* 0xf1 */ { NULL, NULL, 0 },
1233/* 0xf2 */ { NULL, NULL, 0 },
1234/* 0xf3 */ { NULL, NULL, 0 },
1235/* 0xf4 */ { NULL, NULL, 0 },
1236/* 0xf5 */ { NULL, NULL, 0 },
1237/* 0xf6 */ { NULL, NULL, 0 },
1238/* 0xf7 */ { NULL, NULL, 0 },
1239/* 0xf8 */ { NULL, NULL, 0 },
1240/* 0xf9 */ { NULL, NULL, 0 },
1241/* 0xfa */ { NULL, NULL, 0 },
1242/* 0xfb */ { NULL, NULL, 0 },
1243/* 0xfc */ { NULL, NULL, 0 },
1244/* 0xfd */ { NULL, NULL, 0 },
1245/* 0xfe */ { NULL, NULL, 0 },
1246/* 0xff */ { NULL, NULL, 0 }
1247
1248};
1249
1250/*******************************************************************
1251 allocate and initialize a reply packet
1252********************************************************************/
1253
1254bool create_outbuf(TALLOC_CTX *mem_ctx, const char *inbuf, char **outbuf,
1255 uint8_t num_words, uint32_t num_bytes)
1256{
1257 /*
1258 * Protect against integer wrap
1259 */
1260 if ((num_bytes > 0xffffff)
1261 || ((num_bytes + smb_size + num_words*2) > 0xffffff)) {
1262 char *msg;
1263 if (asprintf(&msg, "num_bytes too large: %u",
1264 (unsigned)num_bytes) == -1) {
1265 msg = CONST_DISCARD(char *, "num_bytes too large");
1266 }
1267 smb_panic(msg);
1268 }
1269
1270 *outbuf = TALLOC_ARRAY(mem_ctx, char,
1271 smb_size + num_words*2 + num_bytes);
1272 if (*outbuf == NULL) {
1273 return false;
1274 }
1275
1276 construct_reply_common(inbuf, *outbuf);
1277 srv_set_message(*outbuf, num_words, num_bytes, false);
1278 /*
1279 * Zero out the word area, the caller has to take care of the bcc area
1280 * himself
1281 */
1282 if (num_words != 0) {
1283 memset(*outbuf + smb_vwv0, 0, num_words*2);
1284 }
1285
1286 return true;
1287}
1288
1289void reply_outbuf(struct smb_request *req, uint8 num_words, uint32 num_bytes)
1290{
1291 char *outbuf;
1292 if (!create_outbuf(req, (char *)req->inbuf, &outbuf, num_words,
1293 num_bytes)) {
1294 smb_panic("could not allocate output buffer\n");
1295 }
1296 req->outbuf = (uint8_t *)outbuf;
1297}
1298
1299
1300/*******************************************************************
1301 Dump a packet to a file.
1302********************************************************************/
1303
1304static void smb_dump(const char *name, int type, const char *data, ssize_t len)
1305{
1306 int fd, i;
1307 char *fname = NULL;
1308 if (DEBUGLEVEL < 50) {
1309 return;
1310 }
1311
1312 if (len < 4) len = smb_len(data)+4;
1313 for (i=1;i<100;i++) {
1314 if (asprintf(&fname, "/tmp/%s.%d.%s", name, i,
1315 type ? "req" : "resp") == -1) {
1316 return;
1317 }
1318 fd = open(fname, O_WRONLY|O_CREAT|O_EXCL, 0644);
1319 if (fd != -1 || errno != EEXIST) break;
1320 }
1321 if (fd != -1) {
1322 ssize_t ret = write(fd, data, len);
1323 if (ret != len)
1324 DEBUG(0,("smb_dump: problem: write returned %d\n", (int)ret ));
1325 close(fd);
1326 DEBUG(0,("created %s len %lu\n", fname, (unsigned long)len));
1327 }
1328 SAFE_FREE(fname);
1329}
1330
1331/****************************************************************************
1332 Prepare everything for calling the actual request function, and potentially
1333 call the request function via the "new" interface.
1334
1335 Return False if the "legacy" function needs to be called, everything is
1336 prepared.
1337
1338 Return True if we're done.
1339
1340 I know this API sucks, but it is the one with the least code change I could
1341 find.
1342****************************************************************************/
1343
1344static connection_struct *switch_message(uint8 type, struct smb_request *req, int size)
1345{
1346 int flags;
1347 uint16 session_tag;
1348 connection_struct *conn = NULL;
1349
1350 static uint16 last_session_tag = UID_FIELD_INVALID;
1351
1352 errno = 0;
1353
1354 /* Make sure this is an SMB packet. smb_size contains NetBIOS header
1355 * so subtract 4 from it. */
1356 if (!valid_smb_header(req->inbuf)
1357 || (size < (smb_size - 4))) {
1358 DEBUG(2,("Non-SMB packet of length %d. Terminating server\n",
1359 smb_len(req->inbuf)));
1360 exit_server_cleanly("Non-SMB packet");
1361 }
1362
1363 if (smb_messages[type].fn == NULL) {
1364 DEBUG(0,("Unknown message type %d!\n",type));
1365 smb_dump("Unknown", 1, (char *)req->inbuf, size);
1366 reply_unknown_new(req, type);
1367 return NULL;
1368 }
1369
1370 flags = smb_messages[type].flags;
1371
1372 /* In share mode security we must ignore the vuid. */
1373 session_tag = (lp_security() == SEC_SHARE)
1374 ? UID_FIELD_INVALID : req->vuid;
1375 conn = req->conn;
1376
1377 DEBUG(3,("switch message %s (pid %d) conn 0x%lx\n", smb_fn_name(type),
1378 (int)sys_getpid(), (unsigned long)conn));
1379
1380 smb_dump(smb_fn_name(type), 1, (char *)req->inbuf, size);
1381
1382 /* Ensure this value is replaced in the incoming packet. */
1383 SSVAL(req->inbuf,smb_uid,session_tag);
1384
1385 /*
1386 * Ensure the correct username is in current_user_info. This is a
1387 * really ugly bugfix for problems with multiple session_setup_and_X's
1388 * being done and allowing %U and %G substitutions to work correctly.
1389 * There is a reason this code is done here, don't move it unless you
1390 * know what you're doing... :-).
1391 * JRA.
1392 */
1393
1394 if (session_tag != last_session_tag) {
1395 user_struct *vuser = NULL;
1396
1397 last_session_tag = session_tag;
1398 if(session_tag != UID_FIELD_INVALID) {
1399 vuser = get_valid_user_struct(session_tag);
1400 if (vuser) {
1401 set_current_user_info(
1402 vuser->server_info->sanitized_username,
1403 vuser->server_info->unix_name,
1404 pdb_get_fullname(vuser->server_info
1405 ->sam_account),
1406 pdb_get_domain(vuser->server_info
1407 ->sam_account));
1408 }
1409 }
1410 }
1411
1412 /* Does this call need to be run as the connected user? */
1413 if (flags & AS_USER) {
1414
1415 /* Does this call need a valid tree connection? */
1416 if (!conn) {
1417 /*
1418 * Amazingly, the error code depends on the command
1419 * (from Samba4).
1420 */
1421 if (type == SMBntcreateX) {
1422 reply_nterror(req, NT_STATUS_INVALID_HANDLE);
1423 } else {
1424 reply_doserror(req, ERRSRV, ERRinvnid);
1425 }
1426 return NULL;
1427 }
1428
1429 if (!change_to_user(conn,session_tag)) {
1430 reply_nterror(req, NT_STATUS_DOS(ERRSRV, ERRbaduid));
1431 remove_deferred_open_smb_message(req->mid);
1432 return conn;
1433 }
1434
1435 /* All NEED_WRITE and CAN_IPC flags must also have AS_USER. */
1436
1437 /* Does it need write permission? */
1438 if ((flags & NEED_WRITE) && !CAN_WRITE(conn)) {
1439 reply_nterror(req, NT_STATUS_MEDIA_WRITE_PROTECTED);
1440 return conn;
1441 }
1442
1443 /* IPC services are limited */
1444 if (IS_IPC(conn) && !(flags & CAN_IPC)) {
1445 reply_doserror(req, ERRSRV,ERRaccess);
1446 return conn;
1447 }
1448 } else {
1449 /* This call needs to be run as root */
1450 change_to_root_user();
1451 }
1452
1453 /* load service specific parameters */
1454 if (conn) {
1455 if (req->encrypted) {
1456 conn->encrypted_tid = true;
1457 /* encrypted required from now on. */
1458 conn->encrypt_level = Required;
1459 } else if (ENCRYPTION_REQUIRED(conn)) {
1460 uint8 com = CVAL(req->inbuf,smb_com);
1461 if (com != SMBtrans2 && com != SMBtranss2) {
1462 exit_server_cleanly("encryption required "
1463 "on connection");
1464 return conn;
1465 }
1466 }
1467
1468 if (!set_current_service(conn,SVAL(req->inbuf,smb_flg),
1469 (flags & (AS_USER|DO_CHDIR)
1470 ?True:False))) {
1471 reply_doserror(req, ERRSRV, ERRaccess);
1472 return conn;
1473 }
1474 conn->num_smb_operations++;
1475 }
1476
1477 /* does this protocol need to be run as guest? */
1478 if ((flags & AS_GUEST)
1479 && (!change_to_guest() ||
1480 !check_access(smbd_server_fd(), lp_hostsallow(-1),
1481 lp_hostsdeny(-1)))) {
1482 reply_doserror(req, ERRSRV, ERRaccess);
1483 return conn;
1484 }
1485
1486 smb_messages[type].fn(req);
1487 return req->conn;
1488}
1489
1490/****************************************************************************
1491 Construct a reply to the incoming packet.
1492****************************************************************************/
1493
1494static void construct_reply(char *inbuf, int size, size_t unread_bytes, bool encrypted)
1495{
1496 uint8 type = CVAL(inbuf,smb_com);
1497 connection_struct *conn;
1498 struct smb_request *req;
1499
1500 chain_size = 0;
1501 file_chain_reset();
1502 reset_chain_p();
1503
1504 if (!(req = talloc(talloc_tos(), struct smb_request))) {
1505 smb_panic("could not allocate smb_request");
1506 }
1507 init_smb_request(req, (uint8 *)inbuf, unread_bytes, encrypted);
1508
1509 conn = switch_message(type, req, size);
1510
1511 if (req->unread_bytes) {
1512 /* writeX failed. drain socket. */
1513 if (drain_socket(smbd_server_fd(), req->unread_bytes) !=
1514 req->unread_bytes) {
1515 smb_panic("failed to drain pending bytes");
1516 }
1517 req->unread_bytes = 0;
1518 }
1519
1520 if (req->outbuf == NULL) {
1521 return;
1522 }
1523
1524 if (CVAL(req->outbuf,0) == 0) {
1525 show_msg((char *)req->outbuf);
1526 }
1527
1528 if (!srv_send_smb(smbd_server_fd(),
1529 (char *)req->outbuf,
1530 IS_CONN_ENCRYPTED(conn)||req->encrypted)) {
1531 exit_server_cleanly("construct_reply: srv_send_smb failed.");
1532 }
1533
1534 TALLOC_FREE(req);
1535
1536 return;
1537}
1538
1539/****************************************************************************
1540 Process an smb from the client
1541****************************************************************************/
1542
1543static void process_smb(char *inbuf, size_t nread, size_t unread_bytes, bool encrypted)
1544{
1545 static int trans_num;
1546 int msg_type = CVAL(inbuf,0);
1547
1548 DO_PROFILE_INC(smb_count);
1549
1550 DEBUG( 6, ( "got message type 0x%x of len 0x%x\n", msg_type,
1551 smb_len(inbuf) ) );
1552 DEBUG( 3, ( "Transaction %d of length %d (%u toread)\n", trans_num,
1553 (int)nread,
1554 (unsigned int)unread_bytes ));
1555
1556 if (msg_type != 0) {
1557 /*
1558 * NetBIOS session request, keepalive, etc.
1559 */
1560 reply_special(inbuf);
1561 return;
1562 }
1563
1564 show_msg(inbuf);
1565
1566 construct_reply(inbuf,nread,unread_bytes,encrypted);
1567
1568 trans_num++;
1569}
1570
1571/****************************************************************************
1572 Return a string containing the function name of a SMB command.
1573****************************************************************************/
1574
1575const char *smb_fn_name(int type)
1576{
1577 const char *unknown_name = "SMBunknown";
1578
1579 if (smb_messages[type].name == NULL)
1580 return(unknown_name);
1581
1582 return(smb_messages[type].name);
1583}
1584
1585/****************************************************************************
1586 Helper functions for contruct_reply.
1587****************************************************************************/
1588
1589static uint32 common_flags2 = FLAGS2_LONG_PATH_COMPONENTS|FLAGS2_32_BIT_ERROR_CODES;
1590
1591void add_to_common_flags2(uint32 v)
1592{
1593 common_flags2 |= v;
1594}
1595
1596void remove_from_common_flags2(uint32 v)
1597{
1598 common_flags2 &= ~v;
1599}
1600
1601void construct_reply_common(const char *inbuf, char *outbuf)
1602{
1603 srv_set_message(outbuf,0,0,false);
1604
1605 SCVAL(outbuf,smb_com,CVAL(inbuf,smb_com));
1606 SIVAL(outbuf,smb_rcls,0);
1607 SCVAL(outbuf,smb_flg, FLAG_REPLY | (CVAL(inbuf,smb_flg) & FLAG_CASELESS_PATHNAMES));
1608 SSVAL(outbuf,smb_flg2,
1609 (SVAL(inbuf,smb_flg2) & FLAGS2_UNICODE_STRINGS) |
1610 common_flags2);
1611 memset(outbuf+smb_pidhigh,'\0',(smb_tid-smb_pidhigh));
1612
1613 SSVAL(outbuf,smb_tid,SVAL(inbuf,smb_tid));
1614 SSVAL(outbuf,smb_pid,SVAL(inbuf,smb_pid));
1615 SSVAL(outbuf,smb_uid,SVAL(inbuf,smb_uid));
1616 SSVAL(outbuf,smb_mid,SVAL(inbuf,smb_mid));
1617}
1618
1619/****************************************************************************
1620 Construct a chained reply and add it to the already made reply
1621****************************************************************************/
1622
1623void chain_reply(struct smb_request *req)
1624{
1625 static char *orig_inbuf;
1626
1627 /*
1628 * Dirty little const_discard: We mess with req->inbuf, which is
1629 * declared as const. If maybe at some point this routine gets
1630 * rewritten, this const_discard could go away.
1631 */
1632 char *inbuf = CONST_DISCARD(char *, req->inbuf);
1633 int size = smb_len(req->inbuf)+4;
1634
1635 int smb_com1, smb_com2 = CVAL(inbuf,smb_vwv0);
1636 unsigned smb_off2 = SVAL(inbuf,smb_vwv1);
1637 char *inbuf2;
1638 int outsize2;
1639 int new_size;
1640 char inbuf_saved[smb_wct];
1641 char *outbuf = (char *)req->outbuf;
1642 size_t outsize = smb_len(outbuf) + 4;
1643 size_t outsize_padded;
1644 size_t padding;
1645 size_t ofs, to_move;
1646
1647 struct smb_request *req2;
1648 size_t caller_outputlen;
1649 char *caller_output;
1650
1651 /* Maybe its not chained, or it's an error packet. */
1652 if (smb_com2 == 0xFF || SVAL(outbuf,smb_rcls) != 0) {
1653 SCVAL(outbuf,smb_vwv0,0xFF);
1654 return;
1655 }
1656
1657 if (chain_size == 0) {
1658 /* this is the first part of the chain */
1659 orig_inbuf = inbuf;
1660 }
1661
1662 /*
1663 * We need to save the output the caller added to the chain so that we
1664 * can splice it into the final output buffer later.
1665 */
1666
1667 caller_outputlen = outsize - smb_wct;
1668
1669 caller_output = (char *)memdup(outbuf + smb_wct, caller_outputlen);
1670
1671 if (caller_output == NULL) {
1672 /* TODO: NT_STATUS_NO_MEMORY */
1673 smb_panic("could not dup outbuf");
1674 }
1675
1676 /*
1677 * The original Win95 redirector dies on a reply to
1678 * a lockingX and read chain unless the chain reply is
1679 * 4 byte aligned. JRA.
1680 */
1681
1682 outsize_padded = (outsize + 3) & ~3;
1683 padding = outsize_padded - outsize;
1684
1685 /*
1686 * remember how much the caller added to the chain, only counting
1687 * stuff after the parameter words
1688 */
1689 chain_size += (outsize_padded - smb_wct);
1690
1691 /*
1692 * work out pointers into the original packets. The
1693 * headers on these need to be filled in
1694 */
1695 inbuf2 = orig_inbuf + smb_off2 + 4 - smb_wct;
1696
1697 /* remember the original command type */
1698 smb_com1 = CVAL(orig_inbuf,smb_com);
1699
1700 /* save the data which will be overwritten by the new headers */
1701 memcpy(inbuf_saved,inbuf2,smb_wct);
1702
1703 /* give the new packet the same header as the last part of the SMB */
1704 memmove(inbuf2,inbuf,smb_wct);
1705
1706 /* create the in buffer */
1707 SCVAL(inbuf2,smb_com,smb_com2);
1708
1709 /* work out the new size for the in buffer. */
1710 new_size = size - (inbuf2 - inbuf);
1711 if (new_size < 0) {
1712 DEBUG(0,("chain_reply: chain packet size incorrect "
1713 "(orig size = %d, offset = %d)\n",
1714 size, (int)(inbuf2 - inbuf) ));
1715 exit_server_cleanly("Bad chained packet");
1716 return;
1717 }
1718
1719 /* And set it in the header. */
1720 smb_setlen(inbuf2, new_size - 4);
1721
1722 DEBUG(3,("Chained message\n"));
1723 show_msg(inbuf2);
1724
1725 if (!(req2 = talloc(talloc_tos(), struct smb_request))) {
1726 smb_panic("could not allocate smb_request");
1727 }
1728 init_smb_request(req2, (uint8 *)inbuf2,0, req->encrypted);
1729
1730 /* process the request */
1731 switch_message(smb_com2, req2, new_size);
1732
1733 /*
1734 * We don't accept deferred operations in chained requests.
1735 */
1736 SMB_ASSERT(req2->outbuf != NULL);
1737 outsize2 = smb_len(req2->outbuf)+4;
1738
1739 /*
1740 * Move away the new command output so that caller_output fits in,
1741 * copy in the caller_output saved above.
1742 */
1743
1744 SMB_ASSERT(outsize_padded >= smb_wct);
1745
1746 /*
1747 * "ofs" is the space we need for caller_output. Equal to
1748 * caller_outputlen plus the padding.
1749 */
1750
1751 ofs = outsize_padded - smb_wct;
1752
1753 /*
1754 * "to_move" is the amount of bytes the secondary routine gave us
1755 */
1756
1757 to_move = outsize2 - smb_wct;
1758
1759 if (to_move + ofs + smb_wct + chain_size > max_send) {
1760 smb_panic("replies too large -- would have to cut");
1761 }
1762
1763 /*
1764 * In the "new" API "outbuf" is allocated via reply_outbuf, just for
1765 * the first request in the chain. So we have to re-allocate it. In
1766 * the "old" API the only outbuf ever used is the global OutBuffer
1767 * which is always large enough.
1768 */
1769
1770 outbuf = TALLOC_REALLOC_ARRAY(NULL, outbuf, char,
1771 to_move + ofs + smb_wct);
1772 if (outbuf == NULL) {
1773 smb_panic("could not realloc outbuf");
1774 }
1775
1776 req->outbuf = (uint8 *)outbuf;
1777
1778 memmove(outbuf + smb_wct + ofs, req2->outbuf + smb_wct, to_move);
1779 memcpy(outbuf + smb_wct, caller_output, caller_outputlen);
1780
1781 /*
1782 * copy the new reply header over the old one but preserve the smb_com
1783 * field
1784 */
1785 memmove(outbuf, req2->outbuf, smb_wct);
1786 SCVAL(outbuf, smb_com, smb_com1);
1787
1788 /*
1789 * We've just copied in the whole "wct" area from the secondary
1790 * function. Fix up the chaining: com2 and the offset need to be
1791 * readjusted.
1792 */
1793
1794 SCVAL(outbuf, smb_vwv0, smb_com2);
1795 SSVAL(outbuf, smb_vwv1, chain_size + smb_wct - 4);
1796
1797 if (padding != 0) {
1798
1799 /*
1800 * Due to padding we have some uninitialized bytes after the
1801 * caller's output
1802 */
1803
1804 memset(outbuf + outsize, 0, padding);
1805 }
1806
1807 smb_setlen(outbuf, outsize2 + caller_outputlen + padding - 4);
1808
1809 /*
1810 * restore the saved data, being careful not to overwrite any data
1811 * from the reply header
1812 */
1813 memcpy(inbuf2,inbuf_saved,smb_wct);
1814
1815 SAFE_FREE(caller_output);
1816 TALLOC_FREE(req2);
1817
1818 /*
1819 * Reset the chain_size for our caller's offset calculations
1820 */
1821
1822 chain_size -= (outsize_padded - smb_wct);
1823
1824 return;
1825}
1826
1827/****************************************************************************
1828 Check if services need reloading.
1829****************************************************************************/
1830
1831void check_reload(time_t t)
1832{
1833 static pid_t mypid = 0;
1834 static time_t last_smb_conf_reload_time = 0;
1835 static time_t last_printer_reload_time = 0;
1836 time_t printcap_cache_time = (time_t)lp_printcap_cache_time();
1837
1838 if(last_smb_conf_reload_time == 0) {
1839 last_smb_conf_reload_time = t;
1840 /* Our printing subsystem might not be ready at smbd start up.
1841 Then no printer is available till the first printers check
1842 is performed. A lower initial interval circumvents this. */
1843 if ( printcap_cache_time > 60 )
1844 last_printer_reload_time = t - printcap_cache_time + 60;
1845 else
1846 last_printer_reload_time = t;
1847 }
1848
1849 if (mypid != getpid()) { /* First time or fork happened meanwhile */
1850 /* randomize over 60 second the printcap reload to avoid all
1851 * process hitting cupsd at the same time */
1852 int time_range = 60;
1853
1854 last_printer_reload_time += random() % time_range;
1855 mypid = getpid();
1856 }
1857
1858 if (reload_after_sighup || (t >= last_smb_conf_reload_time+SMBD_RELOAD_CHECK)) {
1859 reload_services(True);
1860 reload_after_sighup = False;
1861 last_smb_conf_reload_time = t;
1862 }
1863
1864 /* 'printcap cache time = 0' disable the feature */
1865
1866 if ( printcap_cache_time != 0 )
1867 {
1868 /* see if it's time to reload or if the clock has been set back */
1869
1870 if ( (t >= last_printer_reload_time+printcap_cache_time)
1871 || (t-last_printer_reload_time < 0) )
1872 {
1873 DEBUG( 3,( "Printcap cache time expired.\n"));
1874 reload_printers();
1875 last_printer_reload_time = t;
1876 }
1877 }
1878}
1879
1880/****************************************************************************
1881 Process commands from the client
1882****************************************************************************/
1883
1884void smbd_process(void)
1885{
1886 unsigned int num_smbs = 0;
1887 size_t unread_bytes = 0;
1888
1889 char addr[INET6_ADDRSTRLEN];
1890
1891 /*
1892 * Before the first packet, check the global hosts allow/ hosts deny
1893 * parameters before doing any parsing of packets passed to us by the
1894 * client. This prevents attacks on our parsing code from hosts not in
1895 * the hosts allow list.
1896 */
1897
1898 if (!check_access(smbd_server_fd(), lp_hostsallow(-1),
1899 lp_hostsdeny(-1))) {
1900 /*
1901 * send a negative session response "not listening on calling
1902 * name"
1903 */
1904 unsigned char buf[5] = {0x83, 0, 0, 1, 0x81};
1905 DEBUG( 1, ("Connection denied from %s\n",
1906 client_addr(get_client_fd(),addr,sizeof(addr)) ) );
1907 (void)srv_send_smb(smbd_server_fd(),(char *)buf,false);
1908 exit_server_cleanly("connection denied");
1909 }
1910
1911 max_recv = MIN(lp_maxxmit(),BUFFER_SIZE);
1912
1913 while (True) {
1914 NTSTATUS status;
1915 char *inbuf = NULL;
1916 size_t inbuf_len = 0;
1917 bool encrypted = false;
1918 TALLOC_CTX *frame = talloc_stackframe_pool(8192);
1919
1920 errno = 0;
1921
1922 run_events(smbd_event_context(), 0, NULL, NULL);
1923
1924 status = receive_message_or_smb(
1925 talloc_tos(), &inbuf, &inbuf_len,
1926 &unread_bytes, &encrypted);
1927
1928 if (!NT_STATUS_IS_OK(status)) {
1929 DEBUG(3, ("receive_message_or_smb failed: %s, "
1930 "exiting\n", nt_errstr(status)));
1931 return;
1932 }
1933
1934 process_smb(inbuf, inbuf_len, unread_bytes, encrypted);
1935
1936 TALLOC_FREE(inbuf);
1937
1938 num_smbs++;
1939
1940 /* The timeout_processing function isn't run nearly
1941 often enough to implement 'max log size' without
1942 overrunning the size of the file by many megabytes.
1943 This is especially true if we are running at debug
1944 level 10. Checking every 50 SMBs is a nice
1945 tradeoff of performance vs log file size overrun. */
1946
1947 if ((num_smbs % 50) == 0 && need_to_check_log_size()) {
1948 change_to_root_user();
1949 check_log_size();
1950 }
1951 TALLOC_FREE(frame);
1952 }
1953}
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