2 Unix SMB/CIFS implementation.
3 process incoming packets - main loop
4 Copyright (C) Andrew Tridgell 1992-1998
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2 of the License, or
9 (at your option) any later version.
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with this program; if not, write to the Free Software
18 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
23 struct timeval smb_last_time;
25 static char *InBuffer = NULL;
26 char *OutBuffer = NULL;
27 char *last_inbuf = NULL;
30 * Size of data we can send to client. Set
31 * by the client for all protocols above CORE.
32 * Set by us for CORE protocol.
34 int max_send = BUFFER_SIZE;
36 * Size of the data we can receive. Set by us.
37 * Can be modified by the max xmit parameter.
39 int max_recv = BUFFER_SIZE;
41 extern int last_message;
42 extern int global_oplock_break;
43 extern userdom_struct current_user_info;
44 extern int smb_read_error;
45 SIG_ATOMIC_T reload_after_sighup = 0;
46 SIG_ATOMIC_T got_sig_term = 0;
47 extern BOOL global_machine_password_needs_changing;
50 /****************************************************************************
51 structure to hold a linked list of queued messages.
53 ****************************************************************************/
59 } pending_message_list;
61 static ubi_slList smb_oplock_queue = { NULL, (ubi_slNodePtr)&smb_oplock_queue, 0};
63 /****************************************************************************
64 Function to push a message onto the tail of a linked list of smb messages ready
66 ****************************************************************************/
68 static BOOL push_message(ubi_slList *list_head, char *buf, int msg_len)
70 pending_message_list *msg = (pending_message_list *)
71 malloc(sizeof(pending_message_list));
75 DEBUG(0,("push_message: malloc fail (1)\n"));
79 msg->msg_buf = (char *)malloc(msg_len);
80 if(msg->msg_buf == NULL)
82 DEBUG(0,("push_message: malloc fail (2)\n"));
87 memcpy(msg->msg_buf, buf, msg_len);
88 msg->msg_len = msg_len;
90 ubi_slAddTail( list_head, msg);
95 /****************************************************************************
96 Function to push a smb message onto a linked list of local smb messages ready
98 ****************************************************************************/
100 BOOL push_oplock_pending_smb_message(char *buf, int msg_len)
102 return push_message(&smb_oplock_queue, buf, msg_len);
105 /****************************************************************************
106 Do all async processing in here. This includes UDB oplock messages, kernel
107 oplock messages, change notify events etc.
108 ****************************************************************************/
110 static void async_processing(char *buffer, int buffer_len)
112 DEBUG(10,("async_processing: Doing async processing.\n"));
114 /* check for oplock messages (both UDP and kernel) */
115 if (receive_local_message(buffer, buffer_len, 1)) {
116 process_local_message(buffer, buffer_len);
120 exit_server("Caught TERM signal");
123 /* check for async change notify events */
124 process_pending_change_notify_queue(0);
126 /* check for sighup processing */
127 if (reload_after_sighup) {
128 change_to_root_user();
129 DEBUG(1,("Reloading services after SIGHUP\n"));
130 reload_services(False);
131 reload_after_sighup = 0;
135 /****************************************************************************
136 Do a select on an two fd's - with timeout.
138 If a local udp message has been pushed onto the
139 queue (this can only happen during oplock break
140 processing) call async_processing()
142 If a pending smb message has been pushed onto the
143 queue (this can only happen during oplock break
144 processing) return this next.
146 If the first smbfd is ready then read an smb from it.
147 if the second (loopback UDP) fd is ready then read a message
148 from it and setup the buffer header to identify the length
150 Returns False on timeout or error.
153 The timeout is in milliseconds
154 ****************************************************************************/
156 static BOOL receive_message_or_smb(char *buffer, int buffer_len, int timeout)
168 * Note that this call must be before processing any SMB
169 * messages as we need to synchronously process any messages
170 * we may have sent to ourselves from the previous SMB.
175 * Check to see if we already have a message on the smb queue.
176 * If so - copy and return it.
178 if(ubi_slCount(&smb_oplock_queue) != 0) {
179 pending_message_list *msg = (pending_message_list *)ubi_slRemHead(&smb_oplock_queue);
180 memcpy(buffer, msg->msg_buf, MIN(buffer_len, msg->msg_len));
182 /* Free the message we just copied. */
183 SAFE_FREE(msg->msg_buf);
186 DEBUG(5,("receive_message_or_smb: returning queued smb message.\n"));
192 * Setup the select read fd set.
198 * Ensure we process oplock break messages by preference.
199 * We have to do this before the select, after the select
200 * and if the select returns EINTR. This is due to the fact
201 * that the selects called from async_processing can eat an EINTR
202 * caused by a signal (we can't take the break message there).
203 * This is hideously complex - *MUST* be simplified for 3.0 ! JRA.
206 if (oplock_message_waiting(&fds)) {
207 DEBUG(10,("receive_message_or_smb: oplock_message is waiting.\n"));
208 async_processing(buffer, buffer_len);
210 * After async processing we must go and do the select again, as
211 * the state of the flag in fds for the server file descriptor is
212 * indeterminate - we may have done I/O on it in the oplock processing. JRA.
217 FD_SET(smbd_server_fd(),&fds);
218 maxfd = setup_oplock_select_set(&fds);
220 to.tv_sec = timeout / 1000;
221 to.tv_usec = (timeout % 1000) * 1000;
223 selrtn = sys_select(MAX(maxfd,smbd_server_fd())+1,&fds,NULL,NULL,timeout>0?&to:NULL);
225 /* if we get EINTR then maybe we have received an oplock
226 signal - treat this as select returning 1. This is ugly, but
227 is the best we can do until the oplock code knows more about
229 if (selrtn == -1 && errno == EINTR) {
230 async_processing(buffer, buffer_len);
232 * After async processing we must go and do the select again, as
233 * the state of the flag in fds for the server file descriptor is
234 * indeterminate - we may have done I/O on it in the oplock processing. JRA.
241 /* something is wrong. Maybe the socket is dead? */
242 smb_read_error = READ_ERROR;
246 /* Did we timeout ? */
248 smb_read_error = READ_TIMEOUT;
253 * Ensure we process oplock break messages by preference.
254 * This is IMPORTANT ! Otherwise we can starve other processes
255 * sending us an oplock break message. JRA.
258 if (oplock_message_waiting(&fds)) {
259 async_processing(buffer, buffer_len);
261 * After async processing we must go and do the select again, as
262 * the state of the flag in fds for the server file descriptor is
263 * indeterminate - we may have done I/O on it in the oplock processing. JRA.
268 return receive_smb(smbd_server_fd(), buffer, 0);
271 /****************************************************************************
272 Get the next SMB packet, doing the local message processing automatically.
273 ****************************************************************************/
275 BOOL receive_next_smb(char *inbuf, int bufsize, int timeout)
281 ret = receive_message_or_smb(inbuf,bufsize,timeout);
283 got_keepalive = (ret && (CVAL(inbuf,0) == SMBkeepalive));
284 } while (ret && got_keepalive);
289 /****************************************************************************
290 We're terminating and have closed all our files/connections etc.
291 If there are any pending local messages we need to respond to them
292 before termination so that other smbds don't think we just died whilst
294 ****************************************************************************/
296 void respond_to_all_remaining_local_messages(void)
301 * Assert we have no exclusive open oplocks.
304 if(get_number_of_exclusive_open_oplocks()) {
305 DEBUG(0,("respond_to_all_remaining_local_messages: PANIC : we have %d exclusive oplocks.\n",
306 get_number_of_exclusive_open_oplocks() ));
311 * Keep doing receive_local_message with a 1 ms timeout until
312 * we have no more messages.
314 while(receive_local_message(buffer, sizeof(buffer), 1)) {
315 /* Deal with oplock break requests from other smbd's. */
316 process_local_message(buffer, sizeof(buffer));
324 These flags determine some of the permissions required to do an operation
326 Note that I don't set NEED_WRITE on some write operations because they
327 are used by some brain-dead clients when printing, and I don't want to
328 force write permissions on print services.
330 #define AS_USER (1<<0)
331 #define NEED_WRITE (1<<1)
332 #define TIME_INIT (1<<2)
333 #define CAN_IPC (1<<3)
334 #define AS_GUEST (1<<5)
335 #define QUEUE_IN_OPLOCK (1<<6)
338 define a list of possible SMB messages and their corresponding
339 functions. Any message that has a NULL function is unimplemented -
340 please feel free to contribute implementations!
342 static const struct smb_message_struct
345 int (*fn)(connection_struct *conn, char *, char *, int, int);
348 smb_messages[256] = {
350 /* 0x00 */ { "SMBmkdir",reply_mkdir,AS_USER | NEED_WRITE},
351 /* 0x01 */ { "SMBrmdir",reply_rmdir,AS_USER | NEED_WRITE},
352 /* 0x02 */ { "SMBopen",reply_open,AS_USER | QUEUE_IN_OPLOCK },
353 /* 0x03 */ { "SMBcreate",reply_mknew,AS_USER},
354 /* 0x04 */ { "SMBclose",reply_close,AS_USER | CAN_IPC },
355 /* 0x05 */ { "SMBflush",reply_flush,AS_USER},
356 /* 0x06 */ { "SMBunlink",reply_unlink,AS_USER | NEED_WRITE | QUEUE_IN_OPLOCK},
357 /* 0x07 */ { "SMBmv",reply_mv,AS_USER | NEED_WRITE | QUEUE_IN_OPLOCK},
358 /* 0x08 */ { "SMBgetatr",reply_getatr,AS_USER},
359 /* 0x09 */ { "SMBsetatr",reply_setatr,AS_USER | NEED_WRITE},
360 /* 0x0a */ { "SMBread",reply_read,AS_USER},
361 /* 0x0b */ { "SMBwrite",reply_write,AS_USER | CAN_IPC },
362 /* 0x0c */ { "SMBlock",reply_lock,AS_USER},
363 /* 0x0d */ { "SMBunlock",reply_unlock,AS_USER},
364 /* 0x0e */ { "SMBctemp",reply_ctemp,AS_USER | QUEUE_IN_OPLOCK },
365 /* 0x0f */ { "SMBmknew",reply_mknew,AS_USER},
366 /* 0x10 */ { "SMBchkpth",reply_chkpth,AS_USER},
367 /* 0x11 */ { "SMBexit",reply_exit,0},
368 /* 0x12 */ { "SMBlseek",reply_lseek,AS_USER},
369 /* 0x13 */ { "SMBlockread",reply_lockread,AS_USER},
370 /* 0x14 */ { "SMBwriteunlock",reply_writeunlock,AS_USER},
371 /* 0x15 */ { NULL, NULL, 0 },
372 /* 0x16 */ { NULL, NULL, 0 },
373 /* 0x17 */ { NULL, NULL, 0 },
374 /* 0x18 */ { NULL, NULL, 0 },
375 /* 0x19 */ { NULL, NULL, 0 },
376 /* 0x1a */ { "SMBreadbraw",reply_readbraw,AS_USER},
377 /* 0x1b */ { "SMBreadBmpx",reply_readbmpx,AS_USER},
378 /* 0x1c */ { "SMBreadBs",NULL,0 },
379 /* 0x1d */ { "SMBwritebraw",reply_writebraw,AS_USER},
380 /* 0x1e */ { "SMBwriteBmpx",reply_writebmpx,AS_USER},
381 /* 0x1f */ { "SMBwriteBs",reply_writebs,AS_USER},
382 /* 0x20 */ { "SMBwritec",NULL,0},
383 /* 0x21 */ { NULL, NULL, 0 },
384 /* 0x22 */ { "SMBsetattrE",reply_setattrE,AS_USER | NEED_WRITE },
385 /* 0x23 */ { "SMBgetattrE",reply_getattrE,AS_USER },
386 /* 0x24 */ { "SMBlockingX",reply_lockingX,AS_USER },
387 /* 0x25 */ { "SMBtrans",reply_trans,AS_USER | CAN_IPC },
388 /* 0x26 */ { "SMBtranss",NULL,AS_USER | CAN_IPC},
389 /* 0x27 */ { "SMBioctl",reply_ioctl,0},
390 /* 0x28 */ { "SMBioctls",NULL,AS_USER},
391 /* 0x29 */ { "SMBcopy",reply_copy,AS_USER | NEED_WRITE | QUEUE_IN_OPLOCK },
392 /* 0x2a */ { "SMBmove",NULL,AS_USER | NEED_WRITE | QUEUE_IN_OPLOCK },
393 /* 0x2b */ { "SMBecho",reply_echo,0},
394 /* 0x2c */ { "SMBwriteclose",reply_writeclose,AS_USER},
395 /* 0x2d */ { "SMBopenX",reply_open_and_X,AS_USER | CAN_IPC | QUEUE_IN_OPLOCK },
396 /* 0x2e */ { "SMBreadX",reply_read_and_X,AS_USER | CAN_IPC },
397 /* 0x2f */ { "SMBwriteX",reply_write_and_X,AS_USER | CAN_IPC },
398 /* 0x30 */ { NULL, NULL, 0 },
399 /* 0x31 */ { NULL, NULL, 0 },
400 /* 0x32 */ { "SMBtrans2", reply_trans2, AS_USER | CAN_IPC },
401 /* 0x33 */ { "SMBtranss2", reply_transs2, AS_USER},
402 /* 0x34 */ { "SMBfindclose", reply_findclose,AS_USER},
403 /* 0x35 */ { "SMBfindnclose", reply_findnclose, AS_USER},
404 /* 0x36 */ { NULL, NULL, 0 },
405 /* 0x37 */ { NULL, NULL, 0 },
406 /* 0x38 */ { NULL, NULL, 0 },
407 /* 0x39 */ { NULL, NULL, 0 },
408 /* 0x3a */ { NULL, NULL, 0 },
409 /* 0x3b */ { NULL, NULL, 0 },
410 /* 0x3c */ { NULL, NULL, 0 },
411 /* 0x3d */ { NULL, NULL, 0 },
412 /* 0x3e */ { NULL, NULL, 0 },
413 /* 0x3f */ { NULL, NULL, 0 },
414 /* 0x40 */ { NULL, NULL, 0 },
415 /* 0x41 */ { NULL, NULL, 0 },
416 /* 0x42 */ { NULL, NULL, 0 },
417 /* 0x43 */ { NULL, NULL, 0 },
418 /* 0x44 */ { NULL, NULL, 0 },
419 /* 0x45 */ { NULL, NULL, 0 },
420 /* 0x46 */ { NULL, NULL, 0 },
421 /* 0x47 */ { NULL, NULL, 0 },
422 /* 0x48 */ { NULL, NULL, 0 },
423 /* 0x49 */ { NULL, NULL, 0 },
424 /* 0x4a */ { NULL, NULL, 0 },
425 /* 0x4b */ { NULL, NULL, 0 },
426 /* 0x4c */ { NULL, NULL, 0 },
427 /* 0x4d */ { NULL, NULL, 0 },
428 /* 0x4e */ { NULL, NULL, 0 },
429 /* 0x4f */ { NULL, NULL, 0 },
430 /* 0x50 */ { NULL, NULL, 0 },
431 /* 0x51 */ { NULL, NULL, 0 },
432 /* 0x52 */ { NULL, NULL, 0 },
433 /* 0x53 */ { NULL, NULL, 0 },
434 /* 0x54 */ { NULL, NULL, 0 },
435 /* 0x55 */ { NULL, NULL, 0 },
436 /* 0x56 */ { NULL, NULL, 0 },
437 /* 0x57 */ { NULL, NULL, 0 },
438 /* 0x58 */ { NULL, NULL, 0 },
439 /* 0x59 */ { NULL, NULL, 0 },
440 /* 0x5a */ { NULL, NULL, 0 },
441 /* 0x5b */ { NULL, NULL, 0 },
442 /* 0x5c */ { NULL, NULL, 0 },
443 /* 0x5d */ { NULL, NULL, 0 },
444 /* 0x5e */ { NULL, NULL, 0 },
445 /* 0x5f */ { NULL, NULL, 0 },
446 /* 0x60 */ { NULL, NULL, 0 },
447 /* 0x61 */ { NULL, NULL, 0 },
448 /* 0x62 */ { NULL, NULL, 0 },
449 /* 0x63 */ { NULL, NULL, 0 },
450 /* 0x64 */ { NULL, NULL, 0 },
451 /* 0x65 */ { NULL, NULL, 0 },
452 /* 0x66 */ { NULL, NULL, 0 },
453 /* 0x67 */ { NULL, NULL, 0 },
454 /* 0x68 */ { NULL, NULL, 0 },
455 /* 0x69 */ { NULL, NULL, 0 },
456 /* 0x6a */ { NULL, NULL, 0 },
457 /* 0x6b */ { NULL, NULL, 0 },
458 /* 0x6c */ { NULL, NULL, 0 },
459 /* 0x6d */ { NULL, NULL, 0 },
460 /* 0x6e */ { NULL, NULL, 0 },
461 /* 0x6f */ { NULL, NULL, 0 },
462 /* 0x70 */ { "SMBtcon",reply_tcon,0},
463 /* 0x71 */ { "SMBtdis",reply_tdis,0},
464 /* 0x72 */ { "SMBnegprot",reply_negprot,0},
465 /* 0x73 */ { "SMBsesssetupX",reply_sesssetup_and_X,0},
466 /* 0x74 */ { "SMBulogoffX", reply_ulogoffX, 0}, /* ulogoff doesn't give a valid TID */
467 /* 0x75 */ { "SMBtconX",reply_tcon_and_X,0},
468 /* 0x76 */ { NULL, NULL, 0 },
469 /* 0x77 */ { NULL, NULL, 0 },
470 /* 0x78 */ { NULL, NULL, 0 },
471 /* 0x79 */ { NULL, NULL, 0 },
472 /* 0x7a */ { NULL, NULL, 0 },
473 /* 0x7b */ { NULL, NULL, 0 },
474 /* 0x7c */ { NULL, NULL, 0 },
475 /* 0x7d */ { NULL, NULL, 0 },
476 /* 0x7e */ { NULL, NULL, 0 },
477 /* 0x7f */ { NULL, NULL, 0 },
478 /* 0x80 */ { "SMBdskattr",reply_dskattr,AS_USER},
479 /* 0x81 */ { "SMBsearch",reply_search,AS_USER},
480 /* 0x82 */ { "SMBffirst",reply_search,AS_USER},
481 /* 0x83 */ { "SMBfunique",reply_search,AS_USER},
482 /* 0x84 */ { "SMBfclose",reply_fclose,AS_USER},
483 /* 0x85 */ { NULL, NULL, 0 },
484 /* 0x86 */ { NULL, NULL, 0 },
485 /* 0x87 */ { NULL, NULL, 0 },
486 /* 0x88 */ { NULL, NULL, 0 },
487 /* 0x89 */ { NULL, NULL, 0 },
488 /* 0x8a */ { NULL, NULL, 0 },
489 /* 0x8b */ { NULL, NULL, 0 },
490 /* 0x8c */ { NULL, NULL, 0 },
491 /* 0x8d */ { NULL, NULL, 0 },
492 /* 0x8e */ { NULL, NULL, 0 },
493 /* 0x8f */ { NULL, NULL, 0 },
494 /* 0x90 */ { NULL, NULL, 0 },
495 /* 0x91 */ { NULL, NULL, 0 },
496 /* 0x92 */ { NULL, NULL, 0 },
497 /* 0x93 */ { NULL, NULL, 0 },
498 /* 0x94 */ { NULL, NULL, 0 },
499 /* 0x95 */ { NULL, NULL, 0 },
500 /* 0x96 */ { NULL, NULL, 0 },
501 /* 0x97 */ { NULL, NULL, 0 },
502 /* 0x98 */ { NULL, NULL, 0 },
503 /* 0x99 */ { NULL, NULL, 0 },
504 /* 0x9a */ { NULL, NULL, 0 },
505 /* 0x9b */ { NULL, NULL, 0 },
506 /* 0x9c */ { NULL, NULL, 0 },
507 /* 0x9d */ { NULL, NULL, 0 },
508 /* 0x9e */ { NULL, NULL, 0 },
509 /* 0x9f */ { NULL, NULL, 0 },
510 /* 0xa0 */ { "SMBnttrans", reply_nttrans, AS_USER | CAN_IPC | QUEUE_IN_OPLOCK},
511 /* 0xa1 */ { "SMBnttranss", reply_nttranss, AS_USER | CAN_IPC },
512 /* 0xa2 */ { "SMBntcreateX", reply_ntcreate_and_X, AS_USER | CAN_IPC | QUEUE_IN_OPLOCK },
513 /* 0xa3 */ { NULL, NULL, 0 },
514 /* 0xa4 */ { "SMBntcancel", reply_ntcancel, 0 },
515 /* 0xa5 */ { NULL, NULL, 0 },
516 /* 0xa6 */ { NULL, NULL, 0 },
517 /* 0xa7 */ { NULL, NULL, 0 },
518 /* 0xa8 */ { NULL, NULL, 0 },
519 /* 0xa9 */ { NULL, NULL, 0 },
520 /* 0xaa */ { NULL, NULL, 0 },
521 /* 0xab */ { NULL, NULL, 0 },
522 /* 0xac */ { NULL, NULL, 0 },
523 /* 0xad */ { NULL, NULL, 0 },
524 /* 0xae */ { NULL, NULL, 0 },
525 /* 0xaf */ { NULL, NULL, 0 },
526 /* 0xb0 */ { NULL, NULL, 0 },
527 /* 0xb1 */ { NULL, NULL, 0 },
528 /* 0xb2 */ { NULL, NULL, 0 },
529 /* 0xb3 */ { NULL, NULL, 0 },
530 /* 0xb4 */ { NULL, NULL, 0 },
531 /* 0xb5 */ { NULL, NULL, 0 },
532 /* 0xb6 */ { NULL, NULL, 0 },
533 /* 0xb7 */ { NULL, NULL, 0 },
534 /* 0xb8 */ { NULL, NULL, 0 },
535 /* 0xb9 */ { NULL, NULL, 0 },
536 /* 0xba */ { NULL, NULL, 0 },
537 /* 0xbb */ { NULL, NULL, 0 },
538 /* 0xbc */ { NULL, NULL, 0 },
539 /* 0xbd */ { NULL, NULL, 0 },
540 /* 0xbe */ { NULL, NULL, 0 },
541 /* 0xbf */ { NULL, NULL, 0 },
542 /* 0xc0 */ { "SMBsplopen",reply_printopen,AS_USER | QUEUE_IN_OPLOCK },
543 /* 0xc1 */ { "SMBsplwr",reply_printwrite,AS_USER},
544 /* 0xc2 */ { "SMBsplclose",reply_printclose,AS_USER},
545 /* 0xc3 */ { "SMBsplretq",reply_printqueue,AS_USER},
546 /* 0xc4 */ { NULL, NULL, 0 },
547 /* 0xc5 */ { NULL, NULL, 0 },
548 /* 0xc6 */ { NULL, NULL, 0 },
549 /* 0xc7 */ { NULL, NULL, 0 },
550 /* 0xc8 */ { NULL, NULL, 0 },
551 /* 0xc9 */ { NULL, NULL, 0 },
552 /* 0xca */ { NULL, NULL, 0 },
553 /* 0xcb */ { NULL, NULL, 0 },
554 /* 0xcc */ { NULL, NULL, 0 },
555 /* 0xcd */ { NULL, NULL, 0 },
556 /* 0xce */ { NULL, NULL, 0 },
557 /* 0xcf */ { NULL, NULL, 0 },
558 /* 0xd0 */ { "SMBsends",reply_sends,AS_GUEST},
559 /* 0xd1 */ { "SMBsendb",NULL,AS_GUEST},
560 /* 0xd2 */ { "SMBfwdname",NULL,AS_GUEST},
561 /* 0xd3 */ { "SMBcancelf",NULL,AS_GUEST},
562 /* 0xd4 */ { "SMBgetmac",NULL,AS_GUEST},
563 /* 0xd5 */ { "SMBsendstrt",reply_sendstrt,AS_GUEST},
564 /* 0xd6 */ { "SMBsendend",reply_sendend,AS_GUEST},
565 /* 0xd7 */ { "SMBsendtxt",reply_sendtxt,AS_GUEST},
566 /* 0xd8 */ { NULL, NULL, 0 },
567 /* 0xd9 */ { NULL, NULL, 0 },
568 /* 0xda */ { NULL, NULL, 0 },
569 /* 0xdb */ { NULL, NULL, 0 },
570 /* 0xdc */ { NULL, NULL, 0 },
571 /* 0xdd */ { NULL, NULL, 0 },
572 /* 0xde */ { NULL, NULL, 0 },
573 /* 0xdf */ { NULL, NULL, 0 },
574 /* 0xe0 */ { NULL, NULL, 0 },
575 /* 0xe1 */ { NULL, NULL, 0 },
576 /* 0xe2 */ { NULL, NULL, 0 },
577 /* 0xe3 */ { NULL, NULL, 0 },
578 /* 0xe4 */ { NULL, NULL, 0 },
579 /* 0xe5 */ { NULL, NULL, 0 },
580 /* 0xe6 */ { NULL, NULL, 0 },
581 /* 0xe7 */ { NULL, NULL, 0 },
582 /* 0xe8 */ { NULL, NULL, 0 },
583 /* 0xe9 */ { NULL, NULL, 0 },
584 /* 0xea */ { NULL, NULL, 0 },
585 /* 0xeb */ { NULL, NULL, 0 },
586 /* 0xec */ { NULL, NULL, 0 },
587 /* 0xed */ { NULL, NULL, 0 },
588 /* 0xee */ { NULL, NULL, 0 },
589 /* 0xef */ { NULL, NULL, 0 },
590 /* 0xf0 */ { NULL, NULL, 0 },
591 /* 0xf1 */ { NULL, NULL, 0 },
592 /* 0xf2 */ { NULL, NULL, 0 },
593 /* 0xf3 */ { NULL, NULL, 0 },
594 /* 0xf4 */ { NULL, NULL, 0 },
595 /* 0xf5 */ { NULL, NULL, 0 },
596 /* 0xf6 */ { NULL, NULL, 0 },
597 /* 0xf7 */ { NULL, NULL, 0 },
598 /* 0xf8 */ { NULL, NULL, 0 },
599 /* 0xf9 */ { NULL, NULL, 0 },
600 /* 0xfa */ { NULL, NULL, 0 },
601 /* 0xfb */ { NULL, NULL, 0 },
602 /* 0xfc */ { NULL, NULL, 0 },
603 /* 0xfd */ { NULL, NULL, 0 },
604 /* 0xfe */ { NULL, NULL, 0 },
605 /* 0xff */ { NULL, NULL, 0 }
609 /*******************************************************************
610 Dump a packet to a file.
611 ********************************************************************/
613 static void smb_dump(const char *name, int type, char *data, ssize_t len)
617 if (DEBUGLEVEL < 50) return;
619 if (len < 4) len = smb_len(data)+4;
620 for (i=1;i<100;i++) {
621 slprintf(fname,sizeof(fname)-1, "/tmp/%s.%d.%s", name, i,
622 type ? "req" : "resp");
623 fd = open(fname, O_WRONLY|O_CREAT|O_EXCL, 0644);
624 if (fd != -1 || errno != EEXIST) break;
627 ssize_t ret = write(fd, data, len);
629 DEBUG(0,("smb_dump: problem: write returned %d\n", (int)ret ));
631 DEBUG(0,("created %s len %d\n", fname, len));
636 /****************************************************************************
637 Do a switch on the message type, and return the response size
638 ****************************************************************************/
640 static int switch_message(int type,char *inbuf,char *outbuf,int size,int bufsize)
642 static pid_t pid= (pid_t)-1;
644 extern uint16 global_smbpid;
648 if (pid == (pid_t)-1)
654 /* Make sure this is an SMB packet. smb_size contains NetBIOS header so subtract 4 from it. */
655 if ((strncmp(smb_base(inbuf),"\377SMB",4) != 0) || (size < (smb_size - 4))) {
656 DEBUG(2,("Non-SMB packet of length %d. Terminating server\n",smb_len(inbuf)));
657 exit_server("Non-SMB packet");
661 /* yuck! this is an interim measure before we get rid of our
662 current inbuf/outbuf system */
663 global_smbpid = SVAL(inbuf,smb_pid);
665 if (smb_messages[type].fn == NULL) {
666 DEBUG(0,("Unknown message type %d!\n",type));
667 smb_dump("Unknown", 1, inbuf, size);
668 outsize = reply_unknown(inbuf,outbuf);
670 int flags = smb_messages[type].flags;
671 static uint16 last_session_tag = UID_FIELD_INVALID;
672 /* In share mode security we must ignore the vuid. */
673 uint16 session_tag = (lp_security() == SEC_SHARE) ? UID_FIELD_INVALID : SVAL(inbuf,smb_uid);
674 connection_struct *conn = conn_find(SVAL(inbuf,smb_tid));
676 DEBUG(3,("switch message %s (pid %d)\n",smb_fn_name(type),(int)pid));
678 smb_dump(smb_fn_name(type), 1, inbuf, size);
679 if(global_oplock_break) {
680 if(flags & QUEUE_IN_OPLOCK) {
682 * Queue this message as we are the process of an oplock break.
685 DEBUG( 2, ( "switch_message: queueing message due to being in " ) );
686 DEBUGADD( 2, ( "oplock break state.\n" ) );
688 push_oplock_pending_smb_message( inbuf, size );
693 /* Ensure this value is replaced in the incoming packet. */
694 SSVAL(inbuf,smb_uid,session_tag);
697 * Ensure the correct username is in current_user_info.
698 * This is a really ugly bugfix for problems with
699 * multiple session_setup_and_X's being done and
700 * allowing %U and %G substitutions to work correctly.
701 * There is a reason this code is done here, don't
702 * move it unless you know what you're doing... :-).
706 if (session_tag != last_session_tag) {
707 user_struct *vuser = NULL;
709 last_session_tag = session_tag;
710 if(session_tag != UID_FIELD_INVALID)
711 vuser = get_valid_user_struct(session_tag);
713 current_user_info = vuser->user;
716 /* does this protocol need to be run as root? */
717 if (!(flags & AS_USER))
718 change_to_root_user();
720 /* does this protocol need a valid tree connection? */
721 if ((flags & AS_USER) && !conn)
722 return ERROR_DOS(ERRSRV, ERRinvnid);
725 /* does this protocol need to be run as the connected user? */
726 if ((flags & AS_USER) && !change_to_user(conn,session_tag)) {
727 if (flags & AS_GUEST)
730 return(ERROR_DOS(ERRSRV,ERRaccess));
733 /* this code is to work around a bug is MS client 3 without
734 introducing a security hole - it needs to be able to do
735 print queue checks as guest if it isn't logged in properly */
739 /* does it need write permission? */
740 if ((flags & NEED_WRITE) && !CAN_WRITE(conn))
741 return(ERROR_DOS(ERRSRV,ERRaccess));
743 /* ipc services are limited */
744 if (IS_IPC(conn) && (flags & AS_USER) && !(flags & CAN_IPC))
745 return(ERROR_DOS(ERRSRV,ERRaccess));
747 /* load service specific parameters */
748 if (conn && !set_current_service(conn,(flags & AS_USER)?True:False))
749 return(ERROR_DOS(ERRSRV,ERRaccess));
751 /* does this protocol need to be run as guest? */
752 if ((flags & AS_GUEST) && (!change_to_guest() ||
753 !check_access(smbd_server_fd(), lp_hostsallow(-1), lp_hostsdeny(-1))))
754 return(ERROR_DOS(ERRSRV,ERRaccess));
758 outsize = smb_messages[type].fn(conn, inbuf,outbuf,size,bufsize);
761 smb_dump(smb_fn_name(type), 0, outbuf, outsize);
767 /****************************************************************************
768 Construct a reply to the incoming packet.
769 ****************************************************************************/
771 static int construct_reply(char *inbuf,char *outbuf,int size,int bufsize)
773 int type = CVAL(inbuf,smb_com);
775 int msg_type = CVAL(inbuf,0);
777 GetTimeOfDay(&smb_last_time);
784 return(reply_special(inbuf,outbuf));
786 construct_reply_common(inbuf, outbuf);
788 outsize = switch_message(type,inbuf,outbuf,size,bufsize);
790 outsize += chain_size;
793 smb_setlen(outbuf,outsize - 4);
797 /****************************************************************************
798 Keep track of the number of running smbd's. This functionality is used to
799 'hard' limit Samba overhead on resource constrained systems.
800 ****************************************************************************/
802 static BOOL smbd_process_limit(void)
806 if (lp_max_smbd_processes()) {
808 /* Always add one to the smbd process count, as exit_server() always
812 if (!conn_tdb_ctx()) {
813 DEBUG(0,("smbd_process_limit: max smbd processes parameter set with status parameter not \
814 set. Ignoring max smbd restriction.\n"));
818 total_smbds = increment_smbd_process_count();
819 return total_smbds > lp_max_smbd_processes();
825 /****************************************************************************
826 process an smb from the client - split out from the smbd_process() code so
827 it can be used by the oplock break code.
828 ****************************************************************************/
829 void process_smb(char *inbuf, char *outbuf)
831 static int trans_num;
832 int msg_type = CVAL(inbuf,0);
833 int32 len = smb_len(inbuf);
836 DO_PROFILE_INC(smb_count);
838 if (trans_num == 0) {
839 /* on the first packet, check the global hosts allow/ hosts
840 deny parameters before doing any parsing of the packet
841 passed to us by the client. This prevents attacks on our
842 parsing code from hosts not in the hosts allow list */
843 if (smbd_process_limit() ||
844 !check_access(smbd_server_fd(), lp_hostsallow(-1), lp_hostsdeny(-1))) {
845 /* send a negative session response "not listening on calling
847 static unsigned char buf[5] = {0x83, 0, 0, 1, 0x81};
848 DEBUG( 1, ( "Connection denied from %s\n",
850 (void)send_smb(smbd_server_fd(),(char *)buf);
851 exit_server("connection denied");
855 DEBUG( 6, ( "got message type 0x%x of len 0x%x\n", msg_type, len ) );
856 DEBUG( 3, ( "Transaction %d of length %d\n", trans_num, nread ) );
860 else if(msg_type == SMBkeepalive)
861 return; /* Keepalive packet. */
863 nread = construct_reply(inbuf,outbuf,nread,max_send);
867 if (CVAL(outbuf,0) == 0)
870 if (nread != smb_len(outbuf) + 4)
872 DEBUG(0,("ERROR: Invalid message response size! %d %d\n",
873 nread, smb_len(outbuf)));
876 if (!send_smb(smbd_server_fd(),outbuf))
877 exit_server("process_smb: send_smb failed.");
884 /****************************************************************************
885 return a string containing the function name of a SMB command
886 ****************************************************************************/
887 const char *smb_fn_name(int type)
889 const char *unknown_name = "SMBunknown";
891 if (smb_messages[type].name == NULL)
892 return(unknown_name);
894 return(smb_messages[type].name);
898 /****************************************************************************
899 Helper function for contruct_reply.
900 ****************************************************************************/
902 void construct_reply_common(char *inbuf,char *outbuf)
904 memset(outbuf,'\0',smb_size);
906 set_message(outbuf,0,0,True);
907 SCVAL(outbuf,smb_com,CVAL(inbuf,smb_com));
909 memcpy(outbuf+4,inbuf+4,4);
910 SCVAL(outbuf,smb_rcls,SMB_SUCCESS);
911 SCVAL(outbuf,smb_reh,0);
912 SCVAL(outbuf,smb_flg, FLAG_REPLY | (CVAL(inbuf,smb_flg) & FLAG_CASELESS_PATHNAMES));
913 SSVAL(outbuf,smb_flg2,
914 (SVAL(inbuf,smb_flg2) & FLAGS2_UNICODE_STRINGS) |
915 FLAGS2_LONG_PATH_COMPONENTS |
916 FLAGS2_32_BIT_ERROR_CODES | FLAGS2_EXTENDED_SECURITY);
918 SSVAL(outbuf,smb_err,SMB_SUCCESS);
919 SSVAL(outbuf,smb_tid,SVAL(inbuf,smb_tid));
920 SSVAL(outbuf,smb_pid,SVAL(inbuf,smb_pid));
921 SSVAL(outbuf,smb_uid,SVAL(inbuf,smb_uid));
922 SSVAL(outbuf,smb_mid,SVAL(inbuf,smb_mid));
925 /****************************************************************************
926 construct a chained reply and add it to the already made reply
927 **************************************************************************/
928 int chain_reply(char *inbuf,char *outbuf,int size,int bufsize)
930 static char *orig_inbuf;
931 static char *orig_outbuf;
932 int smb_com1, smb_com2 = CVAL(inbuf,smb_vwv0);
933 unsigned smb_off2 = SVAL(inbuf,smb_vwv1);
934 char *inbuf2, *outbuf2;
936 char inbuf_saved[smb_wct];
937 char outbuf_saved[smb_wct];
938 int wct = CVAL(outbuf,smb_wct);
939 int outsize = smb_size + 2*wct + SVAL(outbuf,smb_vwv0+2*wct);
941 /* maybe its not chained */
942 if (smb_com2 == 0xFF) {
943 SCVAL(outbuf,smb_vwv0,0xFF);
947 if (chain_size == 0) {
948 /* this is the first part of the chain */
950 orig_outbuf = outbuf;
954 * The original Win95 redirector dies on a reply to
955 * a lockingX and read chain unless the chain reply is
956 * 4 byte aligned. JRA.
959 outsize = (outsize + 3) & ~3;
961 /* we need to tell the client where the next part of the reply will be */
962 SSVAL(outbuf,smb_vwv1,smb_offset(outbuf+outsize,outbuf));
963 SCVAL(outbuf,smb_vwv0,smb_com2);
965 /* remember how much the caller added to the chain, only counting stuff
966 after the parameter words */
967 chain_size += outsize - smb_wct;
969 /* work out pointers into the original packets. The
970 headers on these need to be filled in */
971 inbuf2 = orig_inbuf + smb_off2 + 4 - smb_wct;
972 outbuf2 = orig_outbuf + SVAL(outbuf,smb_vwv1) + 4 - smb_wct;
974 /* remember the original command type */
975 smb_com1 = CVAL(orig_inbuf,smb_com);
977 /* save the data which will be overwritten by the new headers */
978 memcpy(inbuf_saved,inbuf2,smb_wct);
979 memcpy(outbuf_saved,outbuf2,smb_wct);
981 /* give the new packet the same header as the last part of the SMB */
982 memmove(inbuf2,inbuf,smb_wct);
984 /* create the in buffer */
985 SCVAL(inbuf2,smb_com,smb_com2);
987 /* create the out buffer */
988 construct_reply_common(inbuf2, outbuf2);
990 DEBUG(3,("Chained message\n"));
993 /* process the request */
994 outsize2 = switch_message(smb_com2,inbuf2,outbuf2,size-chain_size,
997 /* copy the new reply and request headers over the old ones, but
998 preserve the smb_com field */
999 memmove(orig_outbuf,outbuf2,smb_wct);
1000 SCVAL(orig_outbuf,smb_com,smb_com1);
1002 /* restore the saved data, being careful not to overwrite any
1003 data from the reply header */
1004 memcpy(inbuf2,inbuf_saved,smb_wct);
1006 int ofs = smb_wct - PTR_DIFF(outbuf2,orig_outbuf);
1007 if (ofs < 0) ofs = 0;
1008 memmove(outbuf2+ofs,outbuf_saved+ofs,smb_wct-ofs);
1014 /****************************************************************************
1015 Setup the needed select timeout.
1016 ****************************************************************************/
1018 static int setup_select_timeout(void)
1023 select_timeout = blocking_locks_timeout(SMBD_SELECT_TIMEOUT);
1024 select_timeout *= 1000;
1026 t = change_notify_timeout();
1028 select_timeout = MIN(select_timeout, t*1000);
1030 if (print_notify_messages_pending())
1031 select_timeout = MIN(select_timeout, 1000);
1033 return select_timeout;
1036 /****************************************************************************
1037 Check if services need reloading.
1038 ****************************************************************************/
1040 void check_reload(int t)
1042 static time_t last_smb_conf_reload_time = 0;
1044 if(last_smb_conf_reload_time == 0)
1045 last_smb_conf_reload_time = t;
1047 if (reload_after_sighup || (t >= last_smb_conf_reload_time+SMBD_RELOAD_CHECK))
1049 reload_services(True);
1050 reload_after_sighup = False;
1051 last_smb_conf_reload_time = t;
1055 /****************************************************************************
1056 Process any timeout housekeeping. Return False if the caller should exit.
1057 ****************************************************************************/
1059 static BOOL timeout_processing(int deadtime, int *select_timeout, time_t *last_timeout_processing_time)
1061 static time_t last_keepalive_sent_time = 0;
1062 static time_t last_idle_closed_check = 0;
1064 BOOL allidle = True;
1065 extern int keepalive;
1067 if (smb_read_error == READ_EOF)
1069 DEBUG(3,("end of file from client\n"));
1073 if (smb_read_error == READ_ERROR)
1075 DEBUG(3,("receive_smb error (%s) exiting\n",
1080 *last_timeout_processing_time = t = time(NULL);
1082 if(last_keepalive_sent_time == 0)
1083 last_keepalive_sent_time = t;
1085 if(last_idle_closed_check == 0)
1086 last_idle_closed_check = t;
1088 /* become root again if waiting */
1089 change_to_root_user();
1091 /* check if we need to reload services */
1094 /* automatic timeout if all connections are closed */
1095 if (conn_num_open()==0 && (t - last_idle_closed_check) >= IDLE_CLOSED_TIMEOUT)
1097 DEBUG( 2, ( "Closing idle connection\n" ) );
1101 last_idle_closed_check = t;
1103 if (keepalive && (t - last_keepalive_sent_time)>keepalive)
1105 extern struct auth_context *negprot_global_auth_context;
1106 if (!send_keepalive(smbd_server_fd())) {
1107 DEBUG( 2, ( "Keepalive failed - exiting.\n" ) );
1111 /* send a keepalive for a password server or the like.
1112 This is attached to the auth_info created in the
1114 if (negprot_global_auth_context
1115 && negprot_global_auth_context->challenge_set_method
1116 && negprot_global_auth_context->challenge_set_method->send_keepalive) {
1117 negprot_global_auth_context->challenge_set_method->send_keepalive
1118 (&negprot_global_auth_context->challenge_set_method->private_data);
1121 last_keepalive_sent_time = t;
1124 /* check for connection timeouts */
1125 allidle = conn_idle_all(t, deadtime);
1127 if (allidle && conn_num_open()>0) {
1128 DEBUG(2,("Closing idle connection 2.\n"));
1132 if(global_machine_password_needs_changing &&
1133 /* for ADS we need to do a regular ADS password change, not a domain
1135 lp_security() == SEC_DOMAIN)
1137 unsigned char trust_passwd_hash[16];
1141 * We're in domain level security, and the code that
1142 * read the machine password flagged that the machine
1143 * password needs changing.
1147 * First, open the machine password file with an exclusive lock.
1150 if (secrets_lock_trust_account_password(lp_workgroup(), True) == False) {
1151 DEBUG(0,("process: unable to lock the machine account password for \
1152 machine %s in domain %s.\n", global_myname(), lp_workgroup() ));
1156 if(!secrets_fetch_trust_account_password(lp_workgroup(), trust_passwd_hash, &lct)) {
1157 DEBUG(0,("process: unable to read the machine account password for \
1158 machine %s in domain %s.\n", global_myname(), lp_workgroup() ));
1159 secrets_lock_trust_account_password(lp_workgroup(), False);
1164 * Make sure someone else hasn't already done this.
1167 if(t < lct + lp_machine_password_timeout()) {
1168 global_machine_password_needs_changing = False;
1169 secrets_lock_trust_account_password(lp_workgroup(), False);
1173 /* always just contact the PDC here */
1175 change_trust_account_password( lp_workgroup(), NULL);
1176 global_machine_password_needs_changing = False;
1177 secrets_lock_trust_account_password(lp_workgroup(), False);
1181 * Check to see if we have any blocking locks
1182 * outstanding on the queue.
1184 process_blocking_lock_queue(t);
1187 * Check to see if we have any change notifies
1188 * outstanding on the queue.
1190 process_pending_change_notify_queue(t);
1193 * Now we are root, check if the log files need pruning.
1194 * Force a log file check.
1196 force_check_log_size();
1199 /* Send any queued printer notify message to interested smbd's. */
1201 print_notify_send_messages();
1204 * Modify the select timeout depending upon
1205 * what we have remaining in our queues.
1208 *select_timeout = setup_select_timeout();
1213 /****************************************************************************
1214 process commands from the client
1215 ****************************************************************************/
1217 void smbd_process(void)
1219 extern int smb_echo_count;
1220 time_t last_timeout_processing_time = time(NULL);
1221 unsigned int num_smbs = 0;
1223 InBuffer = (char *)malloc(BUFFER_SIZE + LARGE_WRITEX_HDR_SIZE + SAFETY_MARGIN);
1224 OutBuffer = (char *)malloc(BUFFER_SIZE + LARGE_WRITEX_HDR_SIZE + SAFETY_MARGIN);
1225 if ((InBuffer == NULL) || (OutBuffer == NULL))
1228 max_recv = MIN(lp_maxxmit(),BUFFER_SIZE);
1231 int deadtime = lp_deadtime()*60;
1232 int select_timeout = setup_select_timeout();
1236 deadtime = DEFAULT_SMBD_TIMEOUT;
1240 /* free up temporary memory */
1242 main_loop_talloc_free();
1244 while (!receive_message_or_smb(InBuffer,BUFFER_SIZE+LARGE_WRITEX_HDR_SIZE,select_timeout)) {
1245 if(!timeout_processing( deadtime, &select_timeout, &last_timeout_processing_time))
1247 num_smbs = 0; /* Reset smb counter. */
1251 * Ensure we do timeout processing if the SMB we just got was
1252 * only an echo request. This allows us to set the select
1253 * timeout in 'receive_message_or_smb()' to any value we like
1254 * without worrying that the client will send echo requests
1255 * faster than the select timeout, thus starving out the
1256 * essential processing (change notify, blocking locks) that
1257 * the timeout code does. JRA.
1259 num_echos = smb_echo_count;
1261 process_smb(InBuffer, OutBuffer);
1263 if (smb_echo_count != num_echos) {
1264 if(!timeout_processing( deadtime, &select_timeout, &last_timeout_processing_time))
1266 num_smbs = 0; /* Reset smb counter. */
1272 * If we are getting smb requests in a constant stream
1273 * with no echos, make sure we attempt timeout processing
1274 * every select_timeout milliseconds - but only check for this
1275 * every 200 smb requests.
1278 if ((num_smbs % 200) == 0) {
1279 time_t new_check_time = time(NULL);
1280 if(new_check_time - last_timeout_processing_time >= (select_timeout/1000)) {
1281 if(!timeout_processing( deadtime, &select_timeout, &last_timeout_processing_time))
1283 num_smbs = 0; /* Reset smb counter. */
1284 last_timeout_processing_time = new_check_time; /* Reset time. */