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;
48 extern fstring global_myworkgroup;
49 extern pstring global_myname;
52 /****************************************************************************
53 structure to hold a linked list of queued messages.
55 ****************************************************************************/
61 } pending_message_list;
63 static ubi_slList smb_oplock_queue = { NULL, (ubi_slNodePtr)&smb_oplock_queue, 0};
65 /****************************************************************************
66 Function to push a message onto the tail of a linked list of smb messages ready
68 ****************************************************************************/
70 static BOOL push_message(ubi_slList *list_head, char *buf, int msg_len)
72 pending_message_list *msg = (pending_message_list *)
73 malloc(sizeof(pending_message_list));
77 DEBUG(0,("push_message: malloc fail (1)\n"));
81 msg->msg_buf = (char *)malloc(msg_len);
82 if(msg->msg_buf == NULL)
84 DEBUG(0,("push_message: malloc fail (2)\n"));
89 memcpy(msg->msg_buf, buf, msg_len);
90 msg->msg_len = msg_len;
92 ubi_slAddTail( list_head, msg);
97 /****************************************************************************
98 Function to push a smb message onto a linked list of local smb messages ready
100 ****************************************************************************/
102 BOOL push_oplock_pending_smb_message(char *buf, int msg_len)
104 return push_message(&smb_oplock_queue, buf, msg_len);
107 /****************************************************************************
108 Do all async processing in here. This includes UDB oplock messages, kernel
109 oplock messages, change notify events etc.
110 ****************************************************************************/
112 static void async_processing(char *buffer, int buffer_len)
114 DEBUG(10,("async_processing: Doing async processing.\n"));
116 /* check for oplock messages (both UDP and kernel) */
117 if (receive_local_message(buffer, buffer_len, 1)) {
118 process_local_message(buffer, buffer_len);
122 exit_server("Caught TERM signal");
125 /* check for async change notify events */
126 process_pending_change_notify_queue(0);
128 /* check for sighup processing */
129 if (reload_after_sighup) {
130 change_to_root_user();
131 DEBUG(1,("Reloading services after SIGHUP\n"));
132 reload_services(False);
133 reload_after_sighup = 0;
137 /****************************************************************************
138 Do a select on an two fd's - with timeout.
140 If a local udp message has been pushed onto the
141 queue (this can only happen during oplock break
142 processing) call async_processing()
144 If a pending smb message has been pushed onto the
145 queue (this can only happen during oplock break
146 processing) return this next.
148 If the first smbfd is ready then read an smb from it.
149 if the second (loopback UDP) fd is ready then read a message
150 from it and setup the buffer header to identify the length
152 Returns False on timeout or error.
155 The timeout is in milliseconds
156 ****************************************************************************/
158 static BOOL receive_message_or_smb(char *buffer, int buffer_len, int timeout)
170 * Note that this call must be before processing any SMB
171 * messages as we need to synchronously process any messages
172 * we may have sent to ourselves from the previous SMB.
177 * Check to see if we already have a message on the smb queue.
178 * If so - copy and return it.
180 if(ubi_slCount(&smb_oplock_queue) != 0) {
181 pending_message_list *msg = (pending_message_list *)ubi_slRemHead(&smb_oplock_queue);
182 memcpy(buffer, msg->msg_buf, MIN(buffer_len, msg->msg_len));
184 /* Free the message we just copied. */
185 SAFE_FREE(msg->msg_buf);
188 DEBUG(5,("receive_message_or_smb: returning queued smb message.\n"));
194 * Setup the select read fd set.
200 * Ensure we process oplock break messages by preference.
201 * We have to do this before the select, after the select
202 * and if the select returns EINTR. This is due to the fact
203 * that the selects called from async_processing can eat an EINTR
204 * caused by a signal (we can't take the break message there).
205 * This is hideously complex - *MUST* be simplified for 3.0 ! JRA.
208 if (oplock_message_waiting(&fds)) {
209 DEBUG(10,("receive_message_or_smb: oplock_message is waiting.\n"));
210 async_processing(buffer, buffer_len);
212 * After async processing we must go and do the select again, as
213 * the state of the flag in fds for the server file descriptor is
214 * indeterminate - we may have done I/O on it in the oplock processing. JRA.
219 FD_SET(smbd_server_fd(),&fds);
220 maxfd = setup_oplock_select_set(&fds);
222 to.tv_sec = timeout / 1000;
223 to.tv_usec = (timeout % 1000) * 1000;
225 selrtn = sys_select(MAX(maxfd,smbd_server_fd())+1,&fds,NULL,NULL,timeout>0?&to:NULL);
227 /* if we get EINTR then maybe we have received an oplock
228 signal - treat this as select returning 1. This is ugly, but
229 is the best we can do until the oplock code knows more about
231 if (selrtn == -1 && errno == EINTR) {
232 async_processing(buffer, buffer_len);
234 * After async processing we must go and do the select again, as
235 * the state of the flag in fds for the server file descriptor is
236 * indeterminate - we may have done I/O on it in the oplock processing. JRA.
243 /* something is wrong. Maybe the socket is dead? */
244 smb_read_error = READ_ERROR;
248 /* Did we timeout ? */
250 smb_read_error = READ_TIMEOUT;
255 * Ensure we process oplock break messages by preference.
256 * This is IMPORTANT ! Otherwise we can starve other processes
257 * sending us an oplock break message. JRA.
260 if (oplock_message_waiting(&fds)) {
261 async_processing(buffer, buffer_len);
263 * After async processing we must go and do the select again, as
264 * the state of the flag in fds for the server file descriptor is
265 * indeterminate - we may have done I/O on it in the oplock processing. JRA.
270 return receive_smb(smbd_server_fd(), buffer, 0);
273 /****************************************************************************
274 Get the next SMB packet, doing the local message processing automatically.
275 ****************************************************************************/
277 BOOL receive_next_smb(char *inbuf, int bufsize, int timeout)
283 ret = receive_message_or_smb(inbuf,bufsize,timeout);
285 got_keepalive = (ret && (CVAL(inbuf,0) == SMBkeepalive));
286 } while (ret && got_keepalive);
291 /****************************************************************************
292 We're terminating and have closed all our files/connections etc.
293 If there are any pending local messages we need to respond to them
294 before termination so that other smbds don't think we just died whilst
296 ****************************************************************************/
298 void respond_to_all_remaining_local_messages(void)
303 * Assert we have no exclusive open oplocks.
306 if(get_number_of_exclusive_open_oplocks()) {
307 DEBUG(0,("respond_to_all_remaining_local_messages: PANIC : we have %d exclusive oplocks.\n",
308 get_number_of_exclusive_open_oplocks() ));
313 * Keep doing receive_local_message with a 1 ms timeout until
314 * we have no more messages.
316 while(receive_local_message(buffer, sizeof(buffer), 1)) {
317 /* Deal with oplock break requests from other smbd's. */
318 process_local_message(buffer, sizeof(buffer));
326 These flags determine some of the permissions required to do an operation
328 Note that I don't set NEED_WRITE on some write operations because they
329 are used by some brain-dead clients when printing, and I don't want to
330 force write permissions on print services.
332 #define AS_USER (1<<0)
333 #define NEED_WRITE (1<<1)
334 #define TIME_INIT (1<<2)
335 #define CAN_IPC (1<<3)
336 #define AS_GUEST (1<<5)
337 #define QUEUE_IN_OPLOCK (1<<6)
340 define a list of possible SMB messages and their corresponding
341 functions. Any message that has a NULL function is unimplemented -
342 please feel free to contribute implementations!
344 const static struct smb_message_struct
347 int (*fn)(connection_struct *conn, char *, char *, int, int);
350 smb_messages[256] = {
352 /* 0x00 */ { "SMBmkdir",reply_mkdir,AS_USER | NEED_WRITE},
353 /* 0x01 */ { "SMBrmdir",reply_rmdir,AS_USER | NEED_WRITE},
354 /* 0x02 */ { "SMBopen",reply_open,AS_USER | QUEUE_IN_OPLOCK },
355 /* 0x03 */ { "SMBcreate",reply_mknew,AS_USER},
356 /* 0x04 */ { "SMBclose",reply_close,AS_USER | CAN_IPC },
357 /* 0x05 */ { "SMBflush",reply_flush,AS_USER},
358 /* 0x06 */ { "SMBunlink",reply_unlink,AS_USER | NEED_WRITE | QUEUE_IN_OPLOCK},
359 /* 0x07 */ { "SMBmv",reply_mv,AS_USER | NEED_WRITE | QUEUE_IN_OPLOCK},
360 /* 0x08 */ { "SMBgetatr",reply_getatr,AS_USER},
361 /* 0x09 */ { "SMBsetatr",reply_setatr,AS_USER | NEED_WRITE},
362 /* 0x0a */ { "SMBread",reply_read,AS_USER},
363 /* 0x0b */ { "SMBwrite",reply_write,AS_USER | CAN_IPC },
364 /* 0x0c */ { "SMBlock",reply_lock,AS_USER},
365 /* 0x0d */ { "SMBunlock",reply_unlock,AS_USER},
366 /* 0x0e */ { "SMBctemp",reply_ctemp,AS_USER | QUEUE_IN_OPLOCK },
367 /* 0x0f */ { "SMBmknew",reply_mknew,AS_USER},
368 /* 0x10 */ { "SMBchkpth",reply_chkpth,AS_USER},
369 /* 0x11 */ { "SMBexit",reply_exit,0},
370 /* 0x12 */ { "SMBlseek",reply_lseek,AS_USER},
371 /* 0x13 */ { "SMBlockread",reply_lockread,AS_USER},
372 /* 0x14 */ { "SMBwriteunlock",reply_writeunlock,AS_USER},
373 /* 0x15 */ { NULL, NULL, 0 },
374 /* 0x16 */ { NULL, NULL, 0 },
375 /* 0x17 */ { NULL, NULL, 0 },
376 /* 0x18 */ { NULL, NULL, 0 },
377 /* 0x19 */ { NULL, NULL, 0 },
378 /* 0x1a */ { "SMBreadbraw",reply_readbraw,AS_USER},
379 /* 0x1b */ { "SMBreadBmpx",reply_readbmpx,AS_USER},
380 /* 0x1c */ { "SMBreadBs",NULL,0 },
381 /* 0x1d */ { "SMBwritebraw",reply_writebraw,AS_USER},
382 /* 0x1e */ { "SMBwriteBmpx",reply_writebmpx,AS_USER},
383 /* 0x1f */ { "SMBwriteBs",reply_writebs,AS_USER},
384 /* 0x20 */ { "SMBwritec",NULL,0},
385 /* 0x21 */ { NULL, NULL, 0 },
386 /* 0x22 */ { "SMBsetattrE",reply_setattrE,AS_USER | NEED_WRITE },
387 /* 0x23 */ { "SMBgetattrE",reply_getattrE,AS_USER },
388 /* 0x24 */ { "SMBlockingX",reply_lockingX,AS_USER },
389 /* 0x25 */ { "SMBtrans",reply_trans,AS_USER | CAN_IPC },
390 /* 0x26 */ { "SMBtranss",NULL,AS_USER | CAN_IPC},
391 /* 0x27 */ { "SMBioctl",reply_ioctl,0},
392 /* 0x28 */ { "SMBioctls",NULL,AS_USER},
393 /* 0x29 */ { "SMBcopy",reply_copy,AS_USER | NEED_WRITE | QUEUE_IN_OPLOCK },
394 /* 0x2a */ { "SMBmove",NULL,AS_USER | NEED_WRITE | QUEUE_IN_OPLOCK },
395 /* 0x2b */ { "SMBecho",reply_echo,0},
396 /* 0x2c */ { "SMBwriteclose",reply_writeclose,AS_USER},
397 /* 0x2d */ { "SMBopenX",reply_open_and_X,AS_USER | CAN_IPC | QUEUE_IN_OPLOCK },
398 /* 0x2e */ { "SMBreadX",reply_read_and_X,AS_USER | CAN_IPC },
399 /* 0x2f */ { "SMBwriteX",reply_write_and_X,AS_USER | CAN_IPC },
400 /* 0x30 */ { NULL, NULL, 0 },
401 /* 0x31 */ { NULL, NULL, 0 },
402 /* 0x32 */ { "SMBtrans2", reply_trans2, AS_USER | CAN_IPC },
403 /* 0x33 */ { "SMBtranss2", reply_transs2, AS_USER},
404 /* 0x34 */ { "SMBfindclose", reply_findclose,AS_USER},
405 /* 0x35 */ { "SMBfindnclose", reply_findnclose, AS_USER},
406 /* 0x36 */ { NULL, NULL, 0 },
407 /* 0x37 */ { NULL, NULL, 0 },
408 /* 0x38 */ { NULL, NULL, 0 },
409 /* 0x39 */ { NULL, NULL, 0 },
410 /* 0x3a */ { NULL, NULL, 0 },
411 /* 0x3b */ { NULL, NULL, 0 },
412 /* 0x3c */ { NULL, NULL, 0 },
413 /* 0x3d */ { NULL, NULL, 0 },
414 /* 0x3e */ { NULL, NULL, 0 },
415 /* 0x3f */ { NULL, NULL, 0 },
416 /* 0x40 */ { NULL, NULL, 0 },
417 /* 0x41 */ { NULL, NULL, 0 },
418 /* 0x42 */ { NULL, NULL, 0 },
419 /* 0x43 */ { NULL, NULL, 0 },
420 /* 0x44 */ { NULL, NULL, 0 },
421 /* 0x45 */ { NULL, NULL, 0 },
422 /* 0x46 */ { NULL, NULL, 0 },
423 /* 0x47 */ { NULL, NULL, 0 },
424 /* 0x48 */ { NULL, NULL, 0 },
425 /* 0x49 */ { NULL, NULL, 0 },
426 /* 0x4a */ { NULL, NULL, 0 },
427 /* 0x4b */ { NULL, NULL, 0 },
428 /* 0x4c */ { NULL, NULL, 0 },
429 /* 0x4d */ { NULL, NULL, 0 },
430 /* 0x4e */ { NULL, NULL, 0 },
431 /* 0x4f */ { NULL, NULL, 0 },
432 /* 0x50 */ { NULL, NULL, 0 },
433 /* 0x51 */ { NULL, NULL, 0 },
434 /* 0x52 */ { NULL, NULL, 0 },
435 /* 0x53 */ { NULL, NULL, 0 },
436 /* 0x54 */ { NULL, NULL, 0 },
437 /* 0x55 */ { NULL, NULL, 0 },
438 /* 0x56 */ { NULL, NULL, 0 },
439 /* 0x57 */ { NULL, NULL, 0 },
440 /* 0x58 */ { NULL, NULL, 0 },
441 /* 0x59 */ { NULL, NULL, 0 },
442 /* 0x5a */ { NULL, NULL, 0 },
443 /* 0x5b */ { NULL, NULL, 0 },
444 /* 0x5c */ { NULL, NULL, 0 },
445 /* 0x5d */ { NULL, NULL, 0 },
446 /* 0x5e */ { NULL, NULL, 0 },
447 /* 0x5f */ { NULL, NULL, 0 },
448 /* 0x60 */ { NULL, NULL, 0 },
449 /* 0x61 */ { NULL, NULL, 0 },
450 /* 0x62 */ { NULL, NULL, 0 },
451 /* 0x63 */ { NULL, NULL, 0 },
452 /* 0x64 */ { NULL, NULL, 0 },
453 /* 0x65 */ { NULL, NULL, 0 },
454 /* 0x66 */ { NULL, NULL, 0 },
455 /* 0x67 */ { NULL, NULL, 0 },
456 /* 0x68 */ { NULL, NULL, 0 },
457 /* 0x69 */ { NULL, NULL, 0 },
458 /* 0x6a */ { NULL, NULL, 0 },
459 /* 0x6b */ { NULL, NULL, 0 },
460 /* 0x6c */ { NULL, NULL, 0 },
461 /* 0x6d */ { NULL, NULL, 0 },
462 /* 0x6e */ { NULL, NULL, 0 },
463 /* 0x6f */ { NULL, NULL, 0 },
464 /* 0x70 */ { "SMBtcon",reply_tcon,0},
465 /* 0x71 */ { "SMBtdis",reply_tdis,0},
466 /* 0x72 */ { "SMBnegprot",reply_negprot,0},
467 /* 0x73 */ { "SMBsesssetupX",reply_sesssetup_and_X,0},
468 /* 0x74 */ { "SMBulogoffX", reply_ulogoffX, 0}, /* ulogoff doesn't give a valid TID */
469 /* 0x75 */ { "SMBtconX",reply_tcon_and_X,0},
470 /* 0x76 */ { NULL, NULL, 0 },
471 /* 0x77 */ { NULL, NULL, 0 },
472 /* 0x78 */ { NULL, NULL, 0 },
473 /* 0x79 */ { NULL, NULL, 0 },
474 /* 0x7a */ { NULL, NULL, 0 },
475 /* 0x7b */ { NULL, NULL, 0 },
476 /* 0x7c */ { NULL, NULL, 0 },
477 /* 0x7d */ { NULL, NULL, 0 },
478 /* 0x7e */ { NULL, NULL, 0 },
479 /* 0x7f */ { NULL, NULL, 0 },
480 /* 0x80 */ { "SMBdskattr",reply_dskattr,AS_USER},
481 /* 0x81 */ { "SMBsearch",reply_search,AS_USER},
482 /* 0x82 */ { "SMBffirst",reply_search,AS_USER},
483 /* 0x83 */ { "SMBfunique",reply_search,AS_USER},
484 /* 0x84 */ { "SMBfclose",reply_fclose,AS_USER},
485 /* 0x85 */ { NULL, NULL, 0 },
486 /* 0x86 */ { NULL, NULL, 0 },
487 /* 0x87 */ { NULL, NULL, 0 },
488 /* 0x88 */ { NULL, NULL, 0 },
489 /* 0x89 */ { NULL, NULL, 0 },
490 /* 0x8a */ { NULL, NULL, 0 },
491 /* 0x8b */ { NULL, NULL, 0 },
492 /* 0x8c */ { NULL, NULL, 0 },
493 /* 0x8d */ { NULL, NULL, 0 },
494 /* 0x8e */ { NULL, NULL, 0 },
495 /* 0x8f */ { NULL, NULL, 0 },
496 /* 0x90 */ { NULL, NULL, 0 },
497 /* 0x91 */ { NULL, NULL, 0 },
498 /* 0x92 */ { NULL, NULL, 0 },
499 /* 0x93 */ { NULL, NULL, 0 },
500 /* 0x94 */ { NULL, NULL, 0 },
501 /* 0x95 */ { NULL, NULL, 0 },
502 /* 0x96 */ { NULL, NULL, 0 },
503 /* 0x97 */ { NULL, NULL, 0 },
504 /* 0x98 */ { NULL, NULL, 0 },
505 /* 0x99 */ { NULL, NULL, 0 },
506 /* 0x9a */ { NULL, NULL, 0 },
507 /* 0x9b */ { NULL, NULL, 0 },
508 /* 0x9c */ { NULL, NULL, 0 },
509 /* 0x9d */ { NULL, NULL, 0 },
510 /* 0x9e */ { NULL, NULL, 0 },
511 /* 0x9f */ { NULL, NULL, 0 },
512 /* 0xa0 */ { "SMBnttrans", reply_nttrans, AS_USER | CAN_IPC | QUEUE_IN_OPLOCK},
513 /* 0xa1 */ { "SMBnttranss", reply_nttranss, AS_USER | CAN_IPC },
514 /* 0xa2 */ { "SMBntcreateX", reply_ntcreate_and_X, AS_USER | CAN_IPC | QUEUE_IN_OPLOCK },
515 /* 0xa3 */ { NULL, NULL, 0 },
516 /* 0xa4 */ { "SMBntcancel", reply_ntcancel, 0 },
517 /* 0xa5 */ { NULL, NULL, 0 },
518 /* 0xa6 */ { NULL, NULL, 0 },
519 /* 0xa7 */ { NULL, NULL, 0 },
520 /* 0xa8 */ { NULL, NULL, 0 },
521 /* 0xa9 */ { NULL, NULL, 0 },
522 /* 0xaa */ { NULL, NULL, 0 },
523 /* 0xab */ { NULL, NULL, 0 },
524 /* 0xac */ { NULL, NULL, 0 },
525 /* 0xad */ { NULL, NULL, 0 },
526 /* 0xae */ { NULL, NULL, 0 },
527 /* 0xaf */ { NULL, NULL, 0 },
528 /* 0xb0 */ { NULL, NULL, 0 },
529 /* 0xb1 */ { NULL, NULL, 0 },
530 /* 0xb2 */ { NULL, NULL, 0 },
531 /* 0xb3 */ { NULL, NULL, 0 },
532 /* 0xb4 */ { NULL, NULL, 0 },
533 /* 0xb5 */ { NULL, NULL, 0 },
534 /* 0xb6 */ { NULL, NULL, 0 },
535 /* 0xb7 */ { NULL, NULL, 0 },
536 /* 0xb8 */ { NULL, NULL, 0 },
537 /* 0xb9 */ { NULL, NULL, 0 },
538 /* 0xba */ { NULL, NULL, 0 },
539 /* 0xbb */ { NULL, NULL, 0 },
540 /* 0xbc */ { NULL, NULL, 0 },
541 /* 0xbd */ { NULL, NULL, 0 },
542 /* 0xbe */ { NULL, NULL, 0 },
543 /* 0xbf */ { NULL, NULL, 0 },
544 /* 0xc0 */ { "SMBsplopen",reply_printopen,AS_USER | QUEUE_IN_OPLOCK },
545 /* 0xc1 */ { "SMBsplwr",reply_printwrite,AS_USER},
546 /* 0xc2 */ { "SMBsplclose",reply_printclose,AS_USER},
547 /* 0xc3 */ { "SMBsplretq",reply_printqueue,AS_USER},
548 /* 0xc4 */ { NULL, NULL, 0 },
549 /* 0xc5 */ { NULL, NULL, 0 },
550 /* 0xc6 */ { NULL, NULL, 0 },
551 /* 0xc7 */ { NULL, NULL, 0 },
552 /* 0xc8 */ { NULL, NULL, 0 },
553 /* 0xc9 */ { NULL, NULL, 0 },
554 /* 0xca */ { NULL, NULL, 0 },
555 /* 0xcb */ { NULL, NULL, 0 },
556 /* 0xcc */ { NULL, NULL, 0 },
557 /* 0xcd */ { NULL, NULL, 0 },
558 /* 0xce */ { NULL, NULL, 0 },
559 /* 0xcf */ { NULL, NULL, 0 },
560 /* 0xd0 */ { "SMBsends",reply_sends,AS_GUEST},
561 /* 0xd1 */ { "SMBsendb",NULL,AS_GUEST},
562 /* 0xd2 */ { "SMBfwdname",NULL,AS_GUEST},
563 /* 0xd3 */ { "SMBcancelf",NULL,AS_GUEST},
564 /* 0xd4 */ { "SMBgetmac",NULL,AS_GUEST},
565 /* 0xd5 */ { "SMBsendstrt",reply_sendstrt,AS_GUEST},
566 /* 0xd6 */ { "SMBsendend",reply_sendend,AS_GUEST},
567 /* 0xd7 */ { "SMBsendtxt",reply_sendtxt,AS_GUEST},
568 /* 0xd8 */ { NULL, NULL, 0 },
569 /* 0xd9 */ { NULL, NULL, 0 },
570 /* 0xda */ { NULL, NULL, 0 },
571 /* 0xdb */ { NULL, NULL, 0 },
572 /* 0xdc */ { NULL, NULL, 0 },
573 /* 0xdd */ { NULL, NULL, 0 },
574 /* 0xde */ { NULL, NULL, 0 },
575 /* 0xdf */ { NULL, NULL, 0 },
576 /* 0xe0 */ { NULL, NULL, 0 },
577 /* 0xe1 */ { NULL, NULL, 0 },
578 /* 0xe2 */ { NULL, NULL, 0 },
579 /* 0xe3 */ { NULL, NULL, 0 },
580 /* 0xe4 */ { NULL, NULL, 0 },
581 /* 0xe5 */ { NULL, NULL, 0 },
582 /* 0xe6 */ { NULL, NULL, 0 },
583 /* 0xe7 */ { NULL, NULL, 0 },
584 /* 0xe8 */ { NULL, NULL, 0 },
585 /* 0xe9 */ { NULL, NULL, 0 },
586 /* 0xea */ { NULL, NULL, 0 },
587 /* 0xeb */ { NULL, NULL, 0 },
588 /* 0xec */ { NULL, NULL, 0 },
589 /* 0xed */ { NULL, NULL, 0 },
590 /* 0xee */ { NULL, NULL, 0 },
591 /* 0xef */ { NULL, NULL, 0 },
592 /* 0xf0 */ { NULL, NULL, 0 },
593 /* 0xf1 */ { NULL, NULL, 0 },
594 /* 0xf2 */ { NULL, NULL, 0 },
595 /* 0xf3 */ { NULL, NULL, 0 },
596 /* 0xf4 */ { NULL, NULL, 0 },
597 /* 0xf5 */ { NULL, NULL, 0 },
598 /* 0xf6 */ { NULL, NULL, 0 },
599 /* 0xf7 */ { NULL, NULL, 0 },
600 /* 0xf8 */ { NULL, NULL, 0 },
601 /* 0xf9 */ { NULL, NULL, 0 },
602 /* 0xfa */ { NULL, NULL, 0 },
603 /* 0xfb */ { NULL, NULL, 0 },
604 /* 0xfc */ { NULL, NULL, 0 },
605 /* 0xfd */ { NULL, NULL, 0 },
606 /* 0xfe */ { NULL, NULL, 0 },
607 /* 0xff */ { NULL, NULL, 0 }
611 /*******************************************************************
612 Dump a packet to a file.
613 ********************************************************************/
615 static void smb_dump(const char *name, int type, char *data, ssize_t len)
619 if (DEBUGLEVEL < 50) return;
621 if (len < 4) len = smb_len(data)+4;
622 for (i=1;i<100;i++) {
623 slprintf(fname,sizeof(fname)-1, "/tmp/%s.%d.%s", name, i,
624 type ? "req" : "resp");
625 fd = open(fname, O_WRONLY|O_CREAT|O_EXCL, 0644);
626 if (fd != -1 || errno != EEXIST) break;
629 ssize_t ret = write(fd, data, len);
631 DEBUG(0,("smb_dump: problem: write returned %d\n", (int)ret ));
633 DEBUG(0,("created %s len %d\n", fname, len));
638 /****************************************************************************
639 Do a switch on the message type, and return the response size
640 ****************************************************************************/
642 static int switch_message(int type,char *inbuf,char *outbuf,int size,int bufsize)
644 static pid_t pid= (pid_t)-1;
646 extern uint16 global_smbpid;
650 if (pid == (pid_t)-1)
656 /* Make sure this is an SMB packet */
657 if (strncmp(smb_base(inbuf),"\377SMB",4) != 0) {
658 DEBUG(2,("Non-SMB packet of length %d\n",smb_len(inbuf)));
662 /* yuck! this is an interim measure before we get rid of our
663 current inbuf/outbuf system */
664 global_smbpid = SVAL(inbuf,smb_pid);
666 if (smb_messages[type].fn == NULL) {
667 DEBUG(0,("Unknown message type %d!\n",type));
668 smb_dump("Unknown", 1, inbuf, size);
669 outsize = reply_unknown(inbuf,outbuf);
671 int flags = smb_messages[type].flags;
672 static uint16 last_session_tag = UID_FIELD_INVALID;
673 /* In share mode security we must ignore the vuid. */
674 uint16 session_tag = (lp_security() == SEC_SHARE) ? UID_FIELD_INVALID : SVAL(inbuf,smb_uid);
675 connection_struct *conn = conn_find(SVAL(inbuf,smb_tid));
677 DEBUG(3,("switch message %s (pid %d)\n",smb_fn_name(type),(int)pid));
679 smb_dump(smb_fn_name(type), 1, inbuf, size);
680 if(global_oplock_break) {
681 if(flags & QUEUE_IN_OPLOCK) {
683 * Queue this message as we are the process of an oplock break.
686 DEBUG( 2, ( "switch_message: queueing message due to being in " ) );
687 DEBUGADD( 2, ( "oplock break state.\n" ) );
689 push_oplock_pending_smb_message( inbuf, size );
694 /* Ensure this value is replaced in the incoming packet. */
695 SSVAL(inbuf,smb_uid,session_tag);
698 * Ensure the correct username is in current_user_info.
699 * This is a really ugly bugfix for problems with
700 * multiple session_setup_and_X's being done and
701 * allowing %U and %G substitutions to work correctly.
702 * There is a reason this code is done here, don't
703 * move it unless you know what you're doing... :-).
707 if (session_tag != last_session_tag) {
708 user_struct *vuser = NULL;
710 last_session_tag = session_tag;
711 if(session_tag != UID_FIELD_INVALID)
712 vuser = get_valid_user_struct(session_tag);
714 current_user_info = vuser->user;
717 /* does this protocol need to be run as root? */
718 if (!(flags & AS_USER))
719 change_to_root_user();
721 /* does this protocol need a valid tree connection? */
722 if ((flags & AS_USER) && !conn)
723 return ERROR_DOS(ERRSRV, ERRinvnid);
726 /* does this protocol need to be run as the connected user? */
727 if ((flags & AS_USER) && !change_to_user(conn,session_tag)) {
728 if (flags & AS_GUEST)
731 return(ERROR_DOS(ERRSRV,ERRaccess));
734 /* this code is to work around a bug is MS client 3 without
735 introducing a security hole - it needs to be able to do
736 print queue checks as guest if it isn't logged in properly */
740 /* does it need write permission? */
741 if ((flags & NEED_WRITE) && !CAN_WRITE(conn))
742 return(ERROR_DOS(ERRSRV,ERRaccess));
744 /* ipc services are limited */
745 if (IS_IPC(conn) && (flags & AS_USER) && !(flags & CAN_IPC))
746 return(ERROR_DOS(ERRSRV,ERRaccess));
748 /* load service specific parameters */
749 if (conn && !set_current_service(conn,(flags & AS_USER)?True:False))
750 return(ERROR_DOS(ERRSRV,ERRaccess));
752 /* does this protocol need to be run as guest? */
753 if ((flags & AS_GUEST) && (!change_to_guest() ||
754 !check_access(smbd_server_fd(), lp_hostsallow(-1), lp_hostsdeny(-1))))
755 return(ERROR_DOS(ERRSRV,ERRaccess));
759 outsize = smb_messages[type].fn(conn, inbuf,outbuf,size,bufsize);
762 smb_dump(smb_fn_name(type), 0, outbuf, outsize);
768 /****************************************************************************
769 Construct a reply to the incoming packet.
770 ****************************************************************************/
772 static int construct_reply(char *inbuf,char *outbuf,int size,int bufsize)
774 int type = CVAL(inbuf,smb_com);
776 int msg_type = CVAL(inbuf,0);
778 GetTimeOfDay(&smb_last_time);
785 return(reply_special(inbuf,outbuf));
787 construct_reply_common(inbuf, outbuf);
789 outsize = switch_message(type,inbuf,outbuf,size,bufsize);
791 outsize += chain_size;
794 smb_setlen(outbuf,outsize - 4);
798 /****************************************************************************
799 Keep track of the number of running smbd's. This functionality is used to
800 'hard' limit Samba overhead on resource constrained systems.
801 ****************************************************************************/
803 static BOOL smbd_process_limit(void)
807 if (lp_max_smbd_processes()) {
809 /* Always add one to the smbd process count, as exit_server() always
813 total_smbds = 1; /* In case we need to create the entry. */
815 if (!conn_tdb_ctx()) {
816 DEBUG(0,("smbd_process_limit: max smbd processes parameter set with status parameter not \
817 set. Ignoring max smbd restriction.\n"));
821 if (tdb_change_int32_atomic(conn_tdb_ctx(), "INFO/total_smbds", &total_smbds, 1) == -1)
824 return total_smbds > lp_max_smbd_processes();
830 /****************************************************************************
831 process an smb from the client - split out from the smbd_process() code so
832 it can be used by the oplock break code.
833 ****************************************************************************/
834 void process_smb(char *inbuf, char *outbuf)
836 static int trans_num;
837 int msg_type = CVAL(inbuf,0);
838 int32 len = smb_len(inbuf);
841 DO_PROFILE_INC(smb_count);
843 if (trans_num == 0) {
844 /* on the first packet, check the global hosts allow/ hosts
845 deny parameters before doing any parsing of the packet
846 passed to us by the client. This prevents attacks on our
847 parsing code from hosts not in the hosts allow list */
848 if (smbd_process_limit() ||
849 !check_access(smbd_server_fd(), lp_hostsallow(-1), lp_hostsdeny(-1))) {
850 /* send a negative session response "not listening on calling
852 static unsigned char buf[5] = {0x83, 0, 0, 1, 0x81};
853 DEBUG( 1, ( "Connection denied from %s\n",
855 (void)send_smb(smbd_server_fd(),(char *)buf);
856 exit_server("connection denied");
860 DEBUG( 6, ( "got message type 0x%x of len 0x%x\n", msg_type, len ) );
861 DEBUG( 3, ( "Transaction %d of length %d\n", trans_num, nread ) );
865 else if(msg_type == SMBkeepalive)
866 return; /* Keepalive packet. */
868 nread = construct_reply(inbuf,outbuf,nread,max_send);
872 if (CVAL(outbuf,0) == 0)
875 if (nread != smb_len(outbuf) + 4)
877 DEBUG(0,("ERROR: Invalid message response size! %d %d\n",
878 nread, smb_len(outbuf)));
881 if (!send_smb(smbd_server_fd(),outbuf))
882 exit_server("process_smb: send_smb failed.");
889 /****************************************************************************
890 return a string containing the function name of a SMB command
891 ****************************************************************************/
892 const char *smb_fn_name(int type)
894 static char *unknown_name = "SMBunknown";
896 if (smb_messages[type].name == NULL)
897 return(unknown_name);
899 return(smb_messages[type].name);
903 /****************************************************************************
904 Helper function for contruct_reply.
905 ****************************************************************************/
907 void construct_reply_common(char *inbuf,char *outbuf)
909 memset(outbuf,'\0',smb_size);
911 set_message(outbuf,0,0,True);
912 SCVAL(outbuf,smb_com,CVAL(inbuf,smb_com));
914 memcpy(outbuf+4,inbuf+4,4);
915 SCVAL(outbuf,smb_rcls,SMB_SUCCESS);
916 SCVAL(outbuf,smb_reh,0);
917 SCVAL(outbuf,smb_flg, FLAG_REPLY | (CVAL(inbuf,smb_flg) & FLAG_CASELESS_PATHNAMES));
918 SSVAL(outbuf,smb_flg2,
919 (SVAL(inbuf,smb_flg2) & FLAGS2_UNICODE_STRINGS) |
920 FLAGS2_LONG_PATH_COMPONENTS |
921 FLAGS2_32_BIT_ERROR_CODES | FLAGS2_EXTENDED_SECURITY);
923 SSVAL(outbuf,smb_err,SMB_SUCCESS);
924 SSVAL(outbuf,smb_tid,SVAL(inbuf,smb_tid));
925 SSVAL(outbuf,smb_pid,SVAL(inbuf,smb_pid));
926 SSVAL(outbuf,smb_uid,SVAL(inbuf,smb_uid));
927 SSVAL(outbuf,smb_mid,SVAL(inbuf,smb_mid));
930 /****************************************************************************
931 construct a chained reply and add it to the already made reply
932 **************************************************************************/
933 int chain_reply(char *inbuf,char *outbuf,int size,int bufsize)
935 static char *orig_inbuf;
936 static char *orig_outbuf;
937 int smb_com1, smb_com2 = CVAL(inbuf,smb_vwv0);
938 unsigned smb_off2 = SVAL(inbuf,smb_vwv1);
939 char *inbuf2, *outbuf2;
941 char inbuf_saved[smb_wct];
942 char outbuf_saved[smb_wct];
943 int wct = CVAL(outbuf,smb_wct);
944 int outsize = smb_size + 2*wct + SVAL(outbuf,smb_vwv0+2*wct);
946 /* maybe its not chained */
947 if (smb_com2 == 0xFF) {
948 SCVAL(outbuf,smb_vwv0,0xFF);
952 if (chain_size == 0) {
953 /* this is the first part of the chain */
955 orig_outbuf = outbuf;
959 * The original Win95 redirector dies on a reply to
960 * a lockingX and read chain unless the chain reply is
961 * 4 byte aligned. JRA.
964 outsize = (outsize + 3) & ~3;
966 /* we need to tell the client where the next part of the reply will be */
967 SSVAL(outbuf,smb_vwv1,smb_offset(outbuf+outsize,outbuf));
968 SCVAL(outbuf,smb_vwv0,smb_com2);
970 /* remember how much the caller added to the chain, only counting stuff
971 after the parameter words */
972 chain_size += outsize - smb_wct;
974 /* work out pointers into the original packets. The
975 headers on these need to be filled in */
976 inbuf2 = orig_inbuf + smb_off2 + 4 - smb_wct;
977 outbuf2 = orig_outbuf + SVAL(outbuf,smb_vwv1) + 4 - smb_wct;
979 /* remember the original command type */
980 smb_com1 = CVAL(orig_inbuf,smb_com);
982 /* save the data which will be overwritten by the new headers */
983 memcpy(inbuf_saved,inbuf2,smb_wct);
984 memcpy(outbuf_saved,outbuf2,smb_wct);
986 /* give the new packet the same header as the last part of the SMB */
987 memmove(inbuf2,inbuf,smb_wct);
989 /* create the in buffer */
990 SCVAL(inbuf2,smb_com,smb_com2);
992 /* create the out buffer */
993 construct_reply_common(inbuf2, outbuf2);
995 DEBUG(3,("Chained message\n"));
998 /* process the request */
999 outsize2 = switch_message(smb_com2,inbuf2,outbuf2,size-chain_size,
1000 bufsize-chain_size);
1002 /* copy the new reply and request headers over the old ones, but
1003 preserve the smb_com field */
1004 memmove(orig_outbuf,outbuf2,smb_wct);
1005 SCVAL(orig_outbuf,smb_com,smb_com1);
1007 /* restore the saved data, being careful not to overwrite any
1008 data from the reply header */
1009 memcpy(inbuf2,inbuf_saved,smb_wct);
1011 int ofs = smb_wct - PTR_DIFF(outbuf2,orig_outbuf);
1012 if (ofs < 0) ofs = 0;
1013 memmove(outbuf2+ofs,outbuf_saved+ofs,smb_wct-ofs);
1019 /****************************************************************************
1020 Setup the needed select timeout.
1021 ****************************************************************************/
1023 static int setup_select_timeout(void)
1028 select_timeout = blocking_locks_timeout(SMBD_SELECT_TIMEOUT);
1029 select_timeout *= 1000;
1031 t = change_notify_timeout();
1032 if (t != -1) select_timeout = MIN(select_timeout, t*1000);
1034 return select_timeout;
1037 /****************************************************************************
1038 Check if services need reloading.
1039 ****************************************************************************/
1041 void check_reload(int t)
1043 static time_t last_smb_conf_reload_time = 0;
1045 if(last_smb_conf_reload_time == 0)
1046 last_smb_conf_reload_time = t;
1048 if (reload_after_sighup || (t >= last_smb_conf_reload_time+SMBD_RELOAD_CHECK))
1050 reload_services(True);
1051 reload_after_sighup = False;
1052 last_smb_conf_reload_time = t;
1056 /****************************************************************************
1057 Process any timeout housekeeping. Return False if the caller should exit.
1058 ****************************************************************************/
1060 static BOOL timeout_processing(int deadtime, int *select_timeout, time_t *last_timeout_processing_time)
1062 static time_t last_keepalive_sent_time = 0;
1063 static time_t last_idle_closed_check = 0;
1065 BOOL allidle = True;
1066 extern int keepalive;
1068 if (smb_read_error == READ_EOF)
1070 DEBUG(3,("end of file from client\n"));
1074 if (smb_read_error == READ_ERROR)
1076 DEBUG(3,("receive_smb error (%s) exiting\n",
1081 *last_timeout_processing_time = t = time(NULL);
1083 if(last_keepalive_sent_time == 0)
1084 last_keepalive_sent_time = t;
1086 if(last_idle_closed_check == 0)
1087 last_idle_closed_check = t;
1089 /* become root again if waiting */
1090 change_to_root_user();
1092 /* check if we need to reload services */
1095 /* automatic timeout if all connections are closed */
1096 if (conn_num_open()==0 && (t - last_idle_closed_check) >= IDLE_CLOSED_TIMEOUT)
1098 DEBUG( 2, ( "Closing idle connection\n" ) );
1102 last_idle_closed_check = t;
1104 if (keepalive && (t - last_keepalive_sent_time)>keepalive)
1106 extern struct auth_context *negprot_global_auth_context;
1107 if (!send_keepalive(smbd_server_fd())) {
1108 DEBUG( 2, ( "Keepalive failed - exiting.\n" ) );
1112 /* send a keepalive for a password server or the like.
1113 This is attached to the auth_info created in the
1115 if (negprot_global_auth_context
1116 && negprot_global_auth_context->challenge_set_method
1117 && negprot_global_auth_context->challenge_set_method->send_keepalive) {
1118 negprot_global_auth_context->challenge_set_method->send_keepalive
1119 (&negprot_global_auth_context->challenge_set_method->private_data);
1122 last_keepalive_sent_time = t;
1125 /* check for connection timeouts */
1126 allidle = conn_idle_all(t, deadtime);
1128 if (allidle && conn_num_open()>0) {
1129 DEBUG(2,("Closing idle connection 2.\n"));
1133 if(global_machine_password_needs_changing &&
1134 /* for ADS we need to do a regular ADS password change, not a domain
1136 lp_security() == SEC_DOMAIN)
1138 unsigned char trust_passwd_hash[16];
1140 pstring remote_machine_list;
1143 * We're in domain level security, and the code that
1144 * read the machine password flagged that the machine
1145 * password needs changing.
1149 * First, open the machine password file with an exclusive lock.
1152 if(!secrets_fetch_trust_account_password(global_myworkgroup, trust_passwd_hash, &lct)) {
1153 DEBUG(0,("process: unable to read the machine account password for \
1154 machine %s in domain %s.\n", global_myname, global_myworkgroup ));
1159 * Make sure someone else hasn't already done this.
1162 if(t < lct + lp_machine_password_timeout()) {
1163 global_machine_password_needs_changing = False;
1167 pstrcpy(remote_machine_list, lp_passwordserver());
1169 change_trust_account_password( global_myworkgroup, remote_machine_list);
1170 global_machine_password_needs_changing = False;
1174 * Check to see if we have any blocking locks
1175 * outstanding on the queue.
1177 process_blocking_lock_queue(t);
1180 * Check to see if we have any change notifies
1181 * outstanding on the queue.
1183 process_pending_change_notify_queue(t);
1186 * Now we are root, check if the log files need pruning.
1187 * Force a log file check.
1189 force_check_log_size();
1193 * Modify the select timeout depending upon
1194 * what we have remaining in our queues.
1197 *select_timeout = setup_select_timeout();
1202 /****************************************************************************
1203 process commands from the client
1204 ****************************************************************************/
1206 void smbd_process(void)
1208 extern int smb_echo_count;
1209 time_t last_timeout_processing_time = time(NULL);
1210 unsigned int num_smbs = 0;
1212 InBuffer = (char *)malloc(BUFFER_SIZE + LARGE_WRITEX_HDR_SIZE + SAFETY_MARGIN);
1213 OutBuffer = (char *)malloc(BUFFER_SIZE + LARGE_WRITEX_HDR_SIZE + SAFETY_MARGIN);
1214 if ((InBuffer == NULL) || (OutBuffer == NULL))
1217 max_recv = MIN(lp_maxxmit(),BUFFER_SIZE);
1220 int deadtime = lp_deadtime()*60;
1221 int select_timeout = setup_select_timeout();
1225 deadtime = DEFAULT_SMBD_TIMEOUT;
1229 /* free up temporary memory */
1231 main_loop_talloc_free();
1233 while (!receive_message_or_smb(InBuffer,BUFFER_SIZE+LARGE_WRITEX_HDR_SIZE,select_timeout)) {
1234 if(!timeout_processing( deadtime, &select_timeout, &last_timeout_processing_time))
1236 num_smbs = 0; /* Reset smb counter. */
1240 * Ensure we do timeout processing if the SMB we just got was
1241 * only an echo request. This allows us to set the select
1242 * timeout in 'receive_message_or_smb()' to any value we like
1243 * without worrying that the client will send echo requests
1244 * faster than the select timeout, thus starving out the
1245 * essential processing (change notify, blocking locks) that
1246 * the timeout code does. JRA.
1248 num_echos = smb_echo_count;
1250 process_smb(InBuffer, OutBuffer);
1252 if (smb_echo_count != num_echos) {
1253 if(!timeout_processing( deadtime, &select_timeout, &last_timeout_processing_time))
1255 num_smbs = 0; /* Reset smb counter. */
1261 * If we are getting smb requests in a constant stream
1262 * with no echos, make sure we attempt timeout processing
1263 * every select_timeout milliseconds - but only check for this
1264 * every 200 smb requests.
1267 if ((num_smbs % 200) == 0) {
1268 time_t new_check_time = time(NULL);
1269 if(new_check_time - last_timeout_processing_time >= (select_timeout/1000)) {
1270 if(!timeout_processing( deadtime, &select_timeout, &last_timeout_processing_time))
1272 num_smbs = 0; /* Reset smb counter. */
1273 last_timeout_processing_time = new_check_time; /* Reset time. */