2 Unix SMB/Netbios implementation.
4 process incoming packets - main loop
5 Copyright (C) Andrew Tridgell 1992-1998
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 2 of the License, or
10 (at your option) any later version.
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with this program; if not, write to the Free Software
19 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
24 extern int DEBUGLEVEL;
26 struct timeval smb_last_time;
28 static char *InBuffer = NULL;
29 char *OutBuffer = NULL;
30 char *last_inbuf = NULL;
33 * Size of data we can send to client. Set
34 * by the client for all protocols above CORE.
35 * Set by us for CORE protocol.
37 int max_send = BUFFER_SIZE;
39 * Size of the data we can receive. Set by us.
40 * Can be modified by the max xmit parameter.
42 int max_recv = BUFFER_SIZE;
44 extern int last_message;
45 extern int global_oplock_break;
46 extern userdom_struct current_user_info;
47 extern char *last_inbuf;
48 extern char *InBuffer;
49 extern char *OutBuffer;
50 extern int smb_read_error;
51 extern VOLATILE sig_atomic_t reload_after_sighup;
52 extern BOOL global_machine_password_needs_changing;
53 extern fstring global_myworkgroup;
54 extern pstring global_myname;
57 /****************************************************************************
58 structure to hold a linked list of queued messages.
60 ****************************************************************************/
66 } pending_message_list;
68 static ubi_slList smb_oplock_queue = { NULL, (ubi_slNodePtr)&smb_oplock_queue, 0};
70 /****************************************************************************
71 Function to push a message onto the tail of a linked list of smb messages ready
73 ****************************************************************************/
75 static BOOL push_message(ubi_slList *list_head, char *buf, int msg_len)
77 pending_message_list *msg = (pending_message_list *)
78 malloc(sizeof(pending_message_list));
82 DEBUG(0,("push_message: malloc fail (1)\n"));
86 msg->msg_buf = (char *)malloc(msg_len);
87 if(msg->msg_buf == NULL)
89 DEBUG(0,("push_message: malloc fail (2)\n"));
94 memcpy(msg->msg_buf, buf, msg_len);
95 msg->msg_len = msg_len;
97 ubi_slAddTail( list_head, msg);
102 /****************************************************************************
103 Function to push a smb message onto a linked list of local smb messages ready
105 ****************************************************************************/
107 BOOL push_oplock_pending_smb_message(char *buf, int msg_len)
109 return push_message(&smb_oplock_queue, buf, msg_len);
112 /****************************************************************************
113 do all async processing in here. This includes UDB oplock messages, kernel
114 oplock messages, change notify events etc.
115 ****************************************************************************/
116 static void async_processing(fd_set *fds, char *buffer, int buffer_len)
118 /* check for oplock messages (both UDP and kernel) */
119 if (receive_local_message(fds, buffer, buffer_len, 0)) {
120 process_local_message(buffer, buffer_len);
123 /* check for async change notify events */
124 process_pending_change_notify_queue(0);
126 /* check for sighup processing */
127 if (reload_after_sighup) {
129 DEBUG(1,("Reloading services after SIGHUP\n"));
130 reload_services(False);
131 reload_after_sighup = False;
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 milli seconds
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.
196 FD_SET(smbd_server_fd(),&fds);
197 maxfd = setup_oplock_select_set(&fds);
199 to.tv_sec = timeout / 1000;
200 to.tv_usec = (timeout % 1000) * 1000;
202 selrtn = sys_select(MAX(maxfd,smbd_server_fd())+1,&fds,timeout>0?&to:NULL);
204 /* if we get EINTR then maybe we have received an oplock
205 signal - treat this as select returning 1. This is ugly, but
206 is the best we can do until the oplock code knows more about
208 if (selrtn == -1 && errno == EINTR) {
209 async_processing(&fds, buffer, buffer_len);
211 * After async processing we must go and do the select again, as
212 * the state of the flag in fds for the server file descriptor is
213 * indeterminate - we may have done I/O on it in the oplock processing. JRA.
220 /* something is wrong. Maybe the socket is dead? */
221 smb_read_error = READ_ERROR;
225 /* Did we timeout ? */
227 smb_read_error = READ_TIMEOUT;
232 * Ensure we process oplock break messages by preference.
233 * This is IMPORTANT ! Otherwise we can starve other processes
234 * sending us an oplock break message. JRA.
237 if (oplock_message_waiting(&fds)) {
238 async_processing(&fds, buffer, buffer_len);
240 * After async processing we must go and do the select again, as
241 * the state of the flag in fds for the server file descriptor is
242 * indeterminate - we may have done I/O on it in the oplock processing. JRA.
247 return receive_smb(smbd_server_fd(), buffer, 0);
250 /****************************************************************************
251 Get the next SMB packet, doing the local message processing automatically.
252 ****************************************************************************/
254 BOOL receive_next_smb(char *inbuf, int bufsize, int timeout)
260 ret = receive_message_or_smb(inbuf,bufsize,timeout);
262 got_keepalive = (ret && (CVAL(inbuf,0) == 0x85));
263 } while (ret && got_keepalive);
268 /****************************************************************************
269 We're terminating and have closed all our files/connections etc.
270 If there are any pending local messages we need to respond to them
271 before termination so that other smbds don't think we just died whilst
273 ****************************************************************************/
275 void respond_to_all_remaining_local_messages(void)
281 * Assert we have no exclusive open oplocks.
284 if(get_number_of_exclusive_open_oplocks()) {
285 DEBUG(0,("respond_to_all_remaining_local_messages: PANIC : we have %d exclusive oplocks.\n",
286 get_number_of_exclusive_open_oplocks() ));
291 * Setup the select read fd set.
295 if(!setup_oplock_select_set(&fds))
299 * Keep doing receive_local_message with a 1 ms timeout until
300 * we have no more messages.
302 while(receive_local_message(&fds, buffer, sizeof(buffer), 1)) {
303 /* Deal with oplock break requests from other smbd's. */
304 process_local_message(buffer, sizeof(buffer));
307 (void)setup_oplock_select_set(&fds);
315 These flags determine some of the permissions required to do an operation
317 Note that I don't set NEED_WRITE on some write operations because they
318 are used by some brain-dead clients when printing, and I don't want to
319 force write permissions on print services.
321 #define AS_USER (1<<0)
322 #define NEED_WRITE (1<<1)
323 #define TIME_INIT (1<<2)
324 #define CAN_IPC (1<<3)
325 #define AS_GUEST (1<<5)
326 #define QUEUE_IN_OPLOCK (1<<6)
329 define a list of possible SMB messages and their corresponding
330 functions. Any message that has a NULL function is unimplemented -
331 please feel free to contribute implementations!
333 struct smb_message_struct
336 int (*fn)(connection_struct *conn, char *, char *, int, int);
339 smb_messages[256] = {
341 /* 0x00 */ { "SMBmkdir",reply_mkdir,AS_USER | NEED_WRITE},
342 /* 0x01 */ { "SMBrmdir",reply_rmdir,AS_USER | NEED_WRITE},
343 /* 0x02 */ { "SMBopen",reply_open,AS_USER | QUEUE_IN_OPLOCK },
344 /* 0x03 */ { "SMBcreate",reply_mknew,AS_USER},
345 /* 0x04 */ { "SMBclose",reply_close,AS_USER | CAN_IPC },
346 /* 0x05 */ { "SMBflush",reply_flush,AS_USER},
347 /* 0x06 */ { "SMBunlink",reply_unlink,AS_USER | NEED_WRITE | QUEUE_IN_OPLOCK},
348 /* 0x07 */ { "SMBmv",reply_mv,AS_USER | NEED_WRITE | QUEUE_IN_OPLOCK},
349 /* 0x08 */ { "SMBgetatr",reply_getatr,AS_USER},
350 /* 0x09 */ { "SMBsetatr",reply_setatr,AS_USER | NEED_WRITE},
351 /* 0x0a */ { "SMBread",reply_read,AS_USER},
352 /* 0x0b */ { "SMBwrite",reply_write,AS_USER | CAN_IPC },
353 /* 0x0c */ { "SMBlock",reply_lock,AS_USER},
354 /* 0x0d */ { "SMBunlock",reply_unlock,AS_USER},
355 /* 0x0e */ { "SMBctemp",reply_ctemp,AS_USER | QUEUE_IN_OPLOCK },
356 /* 0x0f */ { "SMBmknew",reply_mknew,AS_USER},
357 /* 0x10 */ { "SMBchkpth",reply_chkpth,AS_USER},
358 /* 0x11 */ { "SMBexit",reply_exit,0},
359 /* 0x12 */ { "SMBlseek",reply_lseek,AS_USER},
360 /* 0x13 */ { "SMBlockread",reply_lockread,AS_USER},
361 /* 0x14 */ { "SMBwriteunlock",reply_writeunlock,AS_USER},
362 /* 0x15 */ { NULL, NULL, 0 },
363 /* 0x16 */ { NULL, NULL, 0 },
364 /* 0x17 */ { NULL, NULL, 0 },
365 /* 0x18 */ { NULL, NULL, 0 },
366 /* 0x19 */ { NULL, NULL, 0 },
367 /* 0x1a */ { "SMBreadbraw",reply_readbraw,AS_USER},
368 /* 0x1b */ { "SMBreadBmpx",reply_readbmpx,AS_USER},
369 /* 0x1c */ { "SMBreadBs",NULL,AS_USER},
370 /* 0x1d */ { "SMBwritebraw",reply_writebraw,AS_USER},
371 /* 0x1e */ { NULL,NULL,0},
372 /* 0x1f */ { NULL,NULL,0},
373 /* 0x20 */ { NULL,NULL,0},
374 /* 0x21 */ { NULL, NULL, 0 },
375 /* 0x22 */ { "SMBsetattrE",reply_setattrE,AS_USER | NEED_WRITE },
376 /* 0x23 */ { "SMBgetattrE",reply_getattrE,AS_USER },
377 /* 0x24 */ { "SMBlockingX",reply_lockingX,AS_USER },
378 /* 0x25 */ { "SMBtrans",reply_trans,AS_USER | CAN_IPC | QUEUE_IN_OPLOCK},
379 /* 0x26 */ { "SMBtranss",NULL,AS_USER | CAN_IPC},
380 /* 0x27 */ { "SMBioctl",reply_ioctl,0},
381 /* 0x28 */ { "SMBioctls",NULL,AS_USER},
382 /* 0x29 */ { "SMBcopy",reply_copy,AS_USER | NEED_WRITE | QUEUE_IN_OPLOCK },
383 /* 0x2a */ { "SMBmove",NULL,AS_USER | NEED_WRITE | QUEUE_IN_OPLOCK },
384 /* 0x2b */ { "SMBecho",reply_echo,0},
385 /* 0x2c */ { "SMBwriteclose",reply_writeclose,AS_USER},
386 /* 0x2d */ { "SMBopenX",reply_open_and_X,AS_USER | CAN_IPC | QUEUE_IN_OPLOCK },
387 /* 0x2e */ { "SMBreadX",reply_read_and_X,AS_USER | CAN_IPC },
388 /* 0x2f */ { "SMBwriteX",reply_write_and_X,AS_USER | CAN_IPC },
389 /* 0x30 */ { NULL, NULL, 0 },
390 /* 0x31 */ { NULL, NULL, 0 },
391 /* 0x32 */ { "SMBtrans2", reply_trans2, AS_USER | QUEUE_IN_OPLOCK | CAN_IPC },
392 /* 0x33 */ { "SMBtranss2", reply_transs2, AS_USER},
393 /* 0x34 */ { "SMBfindclose", reply_findclose,AS_USER},
394 /* 0x35 */ { "SMBfindnclose", reply_findnclose, AS_USER},
395 /* 0x36 */ { NULL, NULL, 0 },
396 /* 0x37 */ { NULL, NULL, 0 },
397 /* 0x38 */ { NULL, NULL, 0 },
398 /* 0x39 */ { NULL, NULL, 0 },
399 /* 0x3a */ { NULL, NULL, 0 },
400 /* 0x3b */ { NULL, NULL, 0 },
401 /* 0x3c */ { NULL, NULL, 0 },
402 /* 0x3d */ { NULL, NULL, 0 },
403 /* 0x3e */ { NULL, NULL, 0 },
404 /* 0x3f */ { NULL, NULL, 0 },
405 /* 0x40 */ { NULL, NULL, 0 },
406 /* 0x41 */ { NULL, NULL, 0 },
407 /* 0x42 */ { NULL, NULL, 0 },
408 /* 0x43 */ { NULL, NULL, 0 },
409 /* 0x44 */ { NULL, NULL, 0 },
410 /* 0x45 */ { NULL, NULL, 0 },
411 /* 0x46 */ { NULL, NULL, 0 },
412 /* 0x47 */ { NULL, NULL, 0 },
413 /* 0x48 */ { NULL, NULL, 0 },
414 /* 0x49 */ { NULL, NULL, 0 },
415 /* 0x4a */ { NULL, NULL, 0 },
416 /* 0x4b */ { NULL, NULL, 0 },
417 /* 0x4c */ { NULL, NULL, 0 },
418 /* 0x4d */ { NULL, NULL, 0 },
419 /* 0x4e */ { NULL, NULL, 0 },
420 /* 0x4f */ { NULL, NULL, 0 },
421 /* 0x50 */ { NULL, NULL, 0 },
422 /* 0x51 */ { NULL, NULL, 0 },
423 /* 0x52 */ { NULL, NULL, 0 },
424 /* 0x53 */ { NULL, NULL, 0 },
425 /* 0x54 */ { NULL, NULL, 0 },
426 /* 0x55 */ { NULL, NULL, 0 },
427 /* 0x56 */ { NULL, NULL, 0 },
428 /* 0x57 */ { NULL, NULL, 0 },
429 /* 0x58 */ { NULL, NULL, 0 },
430 /* 0x59 */ { NULL, NULL, 0 },
431 /* 0x5a */ { NULL, NULL, 0 },
432 /* 0x5b */ { NULL, NULL, 0 },
433 /* 0x5c */ { NULL, NULL, 0 },
434 /* 0x5d */ { NULL, NULL, 0 },
435 /* 0x5e */ { NULL, NULL, 0 },
436 /* 0x5f */ { NULL, NULL, 0 },
437 /* 0x60 */ { NULL, NULL, 0 },
438 /* 0x61 */ { NULL, NULL, 0 },
439 /* 0x62 */ { NULL, NULL, 0 },
440 /* 0x63 */ { NULL, NULL, 0 },
441 /* 0x64 */ { NULL, NULL, 0 },
442 /* 0x65 */ { NULL, NULL, 0 },
443 /* 0x66 */ { NULL, NULL, 0 },
444 /* 0x67 */ { NULL, NULL, 0 },
445 /* 0x68 */ { NULL, NULL, 0 },
446 /* 0x69 */ { NULL, NULL, 0 },
447 /* 0x6a */ { NULL, NULL, 0 },
448 /* 0x6b */ { NULL, NULL, 0 },
449 /* 0x6c */ { NULL, NULL, 0 },
450 /* 0x6d */ { NULL, NULL, 0 },
451 /* 0x6e */ { NULL, NULL, 0 },
452 /* 0x6f */ { NULL, NULL, 0 },
453 /* 0x70 */ { "SMBtcon",reply_tcon,0},
454 /* 0x71 */ { "SMBtdis",reply_tdis,0},
455 /* 0x72 */ { "SMBnegprot",reply_negprot,0},
456 /* 0x73 */ { "SMBsesssetupX",reply_sesssetup_and_X,0},
457 /* 0x74 */ { "SMBulogoffX", reply_ulogoffX, 0}, /* ulogoff doesn't give a valid TID */
458 /* 0x75 */ { "SMBtconX",reply_tcon_and_X,0},
459 /* 0x76 */ { NULL, NULL, 0 },
460 /* 0x77 */ { NULL, NULL, 0 },
461 /* 0x78 */ { NULL, NULL, 0 },
462 /* 0x79 */ { NULL, NULL, 0 },
463 /* 0x7a */ { NULL, NULL, 0 },
464 /* 0x7b */ { NULL, NULL, 0 },
465 /* 0x7c */ { NULL, NULL, 0 },
466 /* 0x7d */ { NULL, NULL, 0 },
467 /* 0x7e */ { NULL, NULL, 0 },
468 /* 0x7f */ { NULL, NULL, 0 },
469 /* 0x80 */ { "SMBdskattr",reply_dskattr,AS_USER},
470 /* 0x81 */ { "SMBsearch",reply_search,AS_USER},
471 /* 0x82 */ { "SMBffirst",reply_search,AS_USER},
472 /* 0x83 */ { "SMBfunique",reply_search,AS_USER},
473 /* 0x84 */ { "SMBfclose",reply_fclose,AS_USER},
474 /* 0x85 */ { NULL, NULL, 0 },
475 /* 0x86 */ { NULL, NULL, 0 },
476 /* 0x87 */ { NULL, NULL, 0 },
477 /* 0x88 */ { NULL, NULL, 0 },
478 /* 0x89 */ { NULL, NULL, 0 },
479 /* 0x8a */ { NULL, NULL, 0 },
480 /* 0x8b */ { NULL, NULL, 0 },
481 /* 0x8c */ { NULL, NULL, 0 },
482 /* 0x8d */ { NULL, NULL, 0 },
483 /* 0x8e */ { NULL, NULL, 0 },
484 /* 0x8f */ { NULL, NULL, 0 },
485 /* 0x90 */ { NULL, NULL, 0 },
486 /* 0x91 */ { NULL, NULL, 0 },
487 /* 0x92 */ { NULL, NULL, 0 },
488 /* 0x93 */ { NULL, NULL, 0 },
489 /* 0x94 */ { NULL, NULL, 0 },
490 /* 0x95 */ { NULL, NULL, 0 },
491 /* 0x96 */ { NULL, NULL, 0 },
492 /* 0x97 */ { NULL, NULL, 0 },
493 /* 0x98 */ { NULL, NULL, 0 },
494 /* 0x99 */ { NULL, NULL, 0 },
495 /* 0x9a */ { NULL, NULL, 0 },
496 /* 0x9b */ { NULL, NULL, 0 },
497 /* 0x9c */ { NULL, NULL, 0 },
498 /* 0x9d */ { NULL, NULL, 0 },
499 /* 0x9e */ { NULL, NULL, 0 },
500 /* 0x9f */ { NULL, NULL, 0 },
501 /* 0xa0 */ { "SMBnttrans", reply_nttrans, AS_USER | CAN_IPC | QUEUE_IN_OPLOCK},
502 /* 0xa1 */ { "SMBnttranss", reply_nttranss, AS_USER | CAN_IPC },
503 /* 0xa2 */ { "SMBntcreateX", reply_ntcreate_and_X, AS_USER | CAN_IPC | QUEUE_IN_OPLOCK },
504 /* 0xa3 */ { NULL, NULL, 0 },
505 /* 0xa4 */ { "SMBntcancel", reply_ntcancel, 0 },
506 /* 0xa5 */ { NULL, NULL, 0 },
507 /* 0xa6 */ { NULL, NULL, 0 },
508 /* 0xa7 */ { NULL, NULL, 0 },
509 /* 0xa8 */ { NULL, NULL, 0 },
510 /* 0xa9 */ { NULL, NULL, 0 },
511 /* 0xaa */ { NULL, NULL, 0 },
512 /* 0xab */ { NULL, NULL, 0 },
513 /* 0xac */ { NULL, NULL, 0 },
514 /* 0xad */ { NULL, NULL, 0 },
515 /* 0xae */ { NULL, NULL, 0 },
516 /* 0xaf */ { NULL, NULL, 0 },
517 /* 0xb0 */ { NULL, NULL, 0 },
518 /* 0xb1 */ { NULL, NULL, 0 },
519 /* 0xb2 */ { NULL, NULL, 0 },
520 /* 0xb3 */ { NULL, NULL, 0 },
521 /* 0xb4 */ { NULL, NULL, 0 },
522 /* 0xb5 */ { NULL, NULL, 0 },
523 /* 0xb6 */ { NULL, NULL, 0 },
524 /* 0xb7 */ { NULL, NULL, 0 },
525 /* 0xb8 */ { NULL, NULL, 0 },
526 /* 0xb9 */ { NULL, NULL, 0 },
527 /* 0xba */ { NULL, NULL, 0 },
528 /* 0xbb */ { NULL, NULL, 0 },
529 /* 0xbc */ { NULL, NULL, 0 },
530 /* 0xbd */ { NULL, NULL, 0 },
531 /* 0xbe */ { NULL, NULL, 0 },
532 /* 0xbf */ { NULL, NULL, 0 },
533 /* 0xc0 */ { "SMBsplopen",reply_printopen,AS_USER | QUEUE_IN_OPLOCK },
534 /* 0xc1 */ { "SMBsplwr",reply_printwrite,AS_USER},
535 /* 0xc2 */ { "SMBsplclose",reply_printclose,AS_USER},
536 /* 0xc3 */ { "SMBsplretq",reply_printqueue,AS_USER},
537 /* 0xc4 */ { NULL, NULL, 0 },
538 /* 0xc5 */ { NULL, NULL, 0 },
539 /* 0xc6 */ { NULL, NULL, 0 },
540 /* 0xc7 */ { NULL, NULL, 0 },
541 /* 0xc8 */ { NULL, NULL, 0 },
542 /* 0xc9 */ { NULL, NULL, 0 },
543 /* 0xca */ { NULL, NULL, 0 },
544 /* 0xcb */ { NULL, NULL, 0 },
545 /* 0xcc */ { NULL, NULL, 0 },
546 /* 0xcd */ { NULL, NULL, 0 },
547 /* 0xce */ { NULL, NULL, 0 },
548 /* 0xcf */ { NULL, NULL, 0 },
549 /* 0xd0 */ { "SMBsends",reply_sends,AS_GUEST},
550 /* 0xd1 */ { "SMBsendb",NULL,AS_GUEST},
551 /* 0xd2 */ { "SMBfwdname",NULL,AS_GUEST},
552 /* 0xd3 */ { "SMBcancelf",NULL,AS_GUEST},
553 /* 0xd4 */ { "SMBgetmac",NULL,AS_GUEST},
554 /* 0xd5 */ { "SMBsendstrt",reply_sendstrt,AS_GUEST},
555 /* 0xd6 */ { "SMBsendend",reply_sendend,AS_GUEST},
556 /* 0xd7 */ { "SMBsendtxt",reply_sendtxt,AS_GUEST},
557 /* 0xd8 */ { NULL, NULL, 0 },
558 /* 0xd9 */ { NULL, NULL, 0 },
559 /* 0xda */ { NULL, NULL, 0 },
560 /* 0xdb */ { NULL, NULL, 0 },
561 /* 0xdc */ { NULL, NULL, 0 },
562 /* 0xdd */ { NULL, NULL, 0 },
563 /* 0xde */ { NULL, NULL, 0 },
564 /* 0xdf */ { NULL, NULL, 0 },
565 /* 0xe0 */ { NULL, NULL, 0 },
566 /* 0xe1 */ { NULL, NULL, 0 },
567 /* 0xe2 */ { NULL, NULL, 0 },
568 /* 0xe3 */ { NULL, NULL, 0 },
569 /* 0xe4 */ { NULL, NULL, 0 },
570 /* 0xe5 */ { NULL, NULL, 0 },
571 /* 0xe6 */ { NULL, NULL, 0 },
572 /* 0xe7 */ { NULL, NULL, 0 },
573 /* 0xe8 */ { NULL, NULL, 0 },
574 /* 0xe9 */ { NULL, NULL, 0 },
575 /* 0xea */ { NULL, NULL, 0 },
576 /* 0xeb */ { NULL, NULL, 0 },
577 /* 0xec */ { NULL, NULL, 0 },
578 /* 0xed */ { NULL, NULL, 0 },
579 /* 0xee */ { NULL, NULL, 0 },
580 /* 0xef */ { NULL, NULL, 0 },
581 /* 0xf0 */ { NULL, NULL, 0 },
582 /* 0xf1 */ { NULL, NULL, 0 },
583 /* 0xf2 */ { NULL, NULL, 0 },
584 /* 0xf3 */ { NULL, NULL, 0 },
585 /* 0xf4 */ { NULL, NULL, 0 },
586 /* 0xf5 */ { NULL, NULL, 0 },
587 /* 0xf6 */ { NULL, NULL, 0 },
588 /* 0xf7 */ { NULL, NULL, 0 },
589 /* 0xf8 */ { NULL, NULL, 0 },
590 /* 0xf9 */ { NULL, NULL, 0 },
591 /* 0xfa */ { NULL, NULL, 0 },
592 /* 0xfb */ { NULL, NULL, 0 },
593 /* 0xfc */ { NULL, NULL, 0 },
594 /* 0xfd */ { NULL, NULL, 0 },
595 /* 0xfe */ { NULL, NULL, 0 },
596 /* 0xff */ { NULL, NULL, 0 }
600 /*******************************************************************
602 ********************************************************************/
603 static void smb_dump(char *name, int type, char *data, ssize_t len)
607 if (DEBUGLEVEL < 50) return;
609 if (len < 4) len = smb_len(data)+4;
610 for (i=1;i<100;i++) {
611 slprintf(fname,sizeof(fname)-1, "/tmp/%s.%d.%s", name, i,
612 type ? "req" : "resp");
613 fd = open(fname, O_WRONLY|O_CREAT|O_EXCL, 0644);
614 if (fd != -1 || errno != EEXIST) break;
617 write(fd, data, len);
619 DEBUG(0,("created %s len %d\n", fname, len));
624 /****************************************************************************
625 do a switch on the message type, and return the response size
626 ****************************************************************************/
627 static int switch_message(int type,char *inbuf,char *outbuf,int size,int bufsize)
629 static pid_t pid= (pid_t)-1;
631 extern uint16 global_smbpid;
635 if (pid == (pid_t)-1)
641 /* make sure this is an SMB packet */
642 if (strncmp(smb_base(inbuf),"\377SMB",4) != 0)
644 DEBUG(2,("Non-SMB packet of length %d\n",smb_len(inbuf)));
648 /* yuck! this is an interim measure before we get rid of our
649 current inbuf/outbuf system */
650 global_smbpid = SVAL(inbuf,smb_pid);
652 if (smb_messages[type].fn == NULL)
654 DEBUG(0,("Unknown message type %d!\n",type));
655 smb_dump("Unknown", 1, inbuf, size);
656 outsize = reply_unknown(inbuf,outbuf);
660 int flags = smb_messages[type].flags;
661 static uint16 last_session_tag = UID_FIELD_INVALID;
662 /* In share mode security we must ignore the vuid. */
663 uint16 session_tag = (lp_security() == SEC_SHARE) ? UID_FIELD_INVALID : SVAL(inbuf,smb_uid);
664 connection_struct *conn = conn_find(SVAL(inbuf,smb_tid));
666 DEBUG(3,("switch message %s (pid %d)\n",smb_fn_name(type),(int)pid));
668 smb_dump(smb_fn_name(type), 1, inbuf, size);
669 if(global_oplock_break)
671 if(flags & QUEUE_IN_OPLOCK)
674 * Queue this message as we are the process of an oplock break.
677 DEBUG( 2, ( "switch_message: queueing message due to being in " ) );
678 DEBUGADD( 2, ( "oplock break state.\n" ) );
680 push_oplock_pending_smb_message( inbuf, size );
685 /* Ensure this value is replaced in the incoming packet. */
686 SSVAL(inbuf,smb_uid,session_tag);
689 * Ensure the correct username is in current_user_info.
690 * This is a really ugly bugfix for problems with
691 * multiple session_setup_and_X's being done and
692 * allowing %U and %G substitutions to work correctly.
693 * There is a reason this code is done here, don't
694 * move it unless you know what you're doing... :-).
698 if (session_tag != last_session_tag) {
699 user_struct *vuser = NULL;
701 last_session_tag = session_tag;
702 if(session_tag != UID_FIELD_INVALID)
703 vuser = get_valid_user_struct(session_tag);
705 current_user_info = vuser->user;
708 /* does this protocol need to be run as root? */
709 if (!(flags & AS_USER))
712 /* does this protocol need a valid tree connection? */
713 if ((flags & AS_USER) && !conn) {
714 return ERROR_DOS(ERRSRV, ERRinvnid);
718 /* does this protocol need to be run as the connected user? */
719 if ((flags & AS_USER) && !become_user(conn,session_tag)) {
720 if (flags & AS_GUEST)
723 return(ERROR_DOS(ERRSRV,ERRaccess));
726 /* this code is to work around a bug is MS client 3 without
727 introducing a security hole - it needs to be able to do
728 print queue checks as guest if it isn't logged in properly */
732 /* does it need write permission? */
733 if ((flags & NEED_WRITE) && !CAN_WRITE(conn))
734 return(ERROR_DOS(ERRSRV,ERRaccess));
736 /* ipc services are limited */
737 if (IS_IPC(conn) && (flags & AS_USER) && !(flags & CAN_IPC)) {
738 return(ERROR_DOS(ERRSRV,ERRaccess));
741 /* load service specific parameters */
742 if (conn && !become_service(conn,(flags & AS_USER)?True:False)) {
743 return(ERROR_DOS(ERRSRV,ERRaccess));
746 /* does this protocol need to be run as guest? */
747 if ((flags & AS_GUEST) &&
749 !check_access(smbd_server_fd(), lp_hostsallow(-1), lp_hostsdeny(-1)))) {
750 return(ERROR_DOS(ERRSRV,ERRaccess));
755 outsize = smb_messages[type].fn(conn, inbuf,outbuf,size,bufsize);
758 smb_dump(smb_fn_name(type), 0, outbuf, outsize);
764 /****************************************************************************
765 construct a reply to the incoming packet
766 ****************************************************************************/
767 static int construct_reply(char *inbuf,char *outbuf,int size,int bufsize)
769 int type = CVAL(inbuf,smb_com);
771 int msg_type = CVAL(inbuf,0);
773 GetTimeOfDay(&smb_last_time);
780 return(reply_special(inbuf,outbuf));
782 construct_reply_common(inbuf, outbuf);
784 outsize = switch_message(type,inbuf,outbuf,size,bufsize);
786 outsize += chain_size;
789 smb_setlen(outbuf,outsize - 4);
793 /****************************************************************************
794 Keep track of the number of running smbd's. This functionality is used to
795 'hard' limit Samba overhead on resource constrained systems.
796 ****************************************************************************/
797 static BOOL smbd_process_limit(void)
801 if (lp_max_smbd_processes()) {
803 /* Always add one to the smbd process count, as exit_server() always
807 total_smbds = 1; /* In case we need to create the entry. */
809 if (tdb_change_int_atomic(conn_tdb_ctx(), "INFO/total_smbds", &total_smbds, 1) == -1)
812 return total_smbds > lp_max_smbd_processes();
818 /****************************************************************************
819 process an smb from the client - split out from the process() code so
820 it can be used by the oplock break code.
821 ****************************************************************************/
822 void process_smb(char *inbuf, char *outbuf)
825 extern BOOL sslEnabled; /* don't use function for performance reasons */
826 static int sslConnected = 0;
827 #endif /* WITH_SSL */
828 static int trans_num;
829 int msg_type = CVAL(inbuf,0);
830 int32 len = smb_len(inbuf);
833 DO_PROFILE_INC(smb_count);
835 if (trans_num == 0) {
836 /* on the first packet, check the global hosts allow/ hosts
837 deny parameters before doing any parsing of the packet
838 passed to us by the client. This prevents attacks on our
839 parsing code from hosts not in the hosts allow list */
840 if (smbd_process_limit() ||
841 !check_access(smbd_server_fd(), lp_hostsallow(-1), lp_hostsdeny(-1))) {
842 /* send a negative session response "not listening on calling
844 static unsigned char buf[5] = {0x83, 0, 0, 1, 0x81};
845 DEBUG( 1, ( "Connection denied from %s\n",
847 (void)send_smb(smbd_server_fd(),(char *)buf);
848 exit_server("connection denied");
852 DEBUG( 6, ( "got message type 0x%x of len 0x%x\n", msg_type, len ) );
853 DEBUG( 3, ( "Transaction %d of length %d\n", trans_num, nread ) );
856 if(sslEnabled && !sslConnected){
857 sslConnected = sslutil_negotiate_ssl(smbd_server_fd(), msg_type);
858 if(sslConnected < 0){ /* an error occured */
859 exit_server("SSL negotiation failed");
860 }else if(sslConnected){
865 #endif /* WITH_SSL */
869 else if(msg_type == 0x85)
870 return; /* Keepalive packet. */
872 nread = construct_reply(inbuf,outbuf,nread,max_send);
876 if (CVAL(outbuf,0) == 0)
879 if (nread != smb_len(outbuf) + 4)
881 DEBUG(0,("ERROR: Invalid message response size! %d %d\n",
882 nread, smb_len(outbuf)));
885 if (!send_smb(smbd_server_fd(),outbuf))
886 exit_server("process_smb: send_smb failed.\n");
893 /****************************************************************************
894 return a string containing the function name of a SMB command
895 ****************************************************************************/
896 char *smb_fn_name(int type)
898 static char *unknown_name = "SMBunknown";
900 if (smb_messages[type].name == NULL)
901 return(unknown_name);
903 return(smb_messages[type].name);
907 /****************************************************************************
908 Helper function for contruct_reply.
909 ****************************************************************************/
911 void construct_reply_common(char *inbuf,char *outbuf)
913 memset(outbuf,'\0',smb_size);
915 set_message(outbuf,0,0,True);
916 CVAL(outbuf,smb_com) = CVAL(inbuf,smb_com);
918 memcpy(outbuf+4,inbuf+4,4);
919 CVAL(outbuf,smb_rcls) = SMB_SUCCESS;
920 CVAL(outbuf,smb_reh) = 0;
921 SCVAL(outbuf,smb_flg, FLAG_REPLY | (CVAL(inbuf,smb_flg) & FLAG_CASELESS_PATHNAMES)); /* bit 7 set
923 SSVAL(outbuf,smb_flg2,
924 (SVAL(inbuf,smb_flg2)&FLAGS2_UNICODE_STRINGS) | FLAGS2_LONG_PATH_COMPONENTS);
925 /* say we support long filenames */
927 SSVAL(outbuf,smb_err,SMB_SUCCESS);
928 SSVAL(outbuf,smb_tid,SVAL(inbuf,smb_tid));
929 SSVAL(outbuf,smb_pid,SVAL(inbuf,smb_pid));
930 SSVAL(outbuf,smb_uid,SVAL(inbuf,smb_uid));
931 SSVAL(outbuf,smb_mid,SVAL(inbuf,smb_mid));
934 /****************************************************************************
935 construct a chained reply and add it to the already made reply
936 **************************************************************************/
937 int chain_reply(char *inbuf,char *outbuf,int size,int bufsize)
939 static char *orig_inbuf;
940 static char *orig_outbuf;
941 int smb_com1, smb_com2 = CVAL(inbuf,smb_vwv0);
942 unsigned smb_off2 = SVAL(inbuf,smb_vwv1);
943 char *inbuf2, *outbuf2;
945 char inbuf_saved[smb_wct];
946 char outbuf_saved[smb_wct];
947 int wct = CVAL(outbuf,smb_wct);
948 int outsize = smb_size + 2*wct + SVAL(outbuf,smb_vwv0+2*wct);
950 /* maybe its not chained */
951 if (smb_com2 == 0xFF) {
952 CVAL(outbuf,smb_vwv0) = 0xFF;
956 if (chain_size == 0) {
957 /* this is the first part of the chain */
959 orig_outbuf = outbuf;
963 * The original Win95 redirector dies on a reply to
964 * a lockingX and read chain unless the chain reply is
965 * 4 byte aligned. JRA.
968 outsize = (outsize + 3) & ~3;
970 /* we need to tell the client where the next part of the reply will be */
971 SSVAL(outbuf,smb_vwv1,smb_offset(outbuf+outsize,outbuf));
972 CVAL(outbuf,smb_vwv0) = smb_com2;
974 /* remember how much the caller added to the chain, only counting stuff
975 after the parameter words */
976 chain_size += outsize - smb_wct;
978 /* work out pointers into the original packets. The
979 headers on these need to be filled in */
980 inbuf2 = orig_inbuf + smb_off2 + 4 - smb_wct;
981 outbuf2 = orig_outbuf + SVAL(outbuf,smb_vwv1) + 4 - smb_wct;
983 /* remember the original command type */
984 smb_com1 = CVAL(orig_inbuf,smb_com);
986 /* save the data which will be overwritten by the new headers */
987 memcpy(inbuf_saved,inbuf2,smb_wct);
988 memcpy(outbuf_saved,outbuf2,smb_wct);
990 /* give the new packet the same header as the last part of the SMB */
991 memmove(inbuf2,inbuf,smb_wct);
993 /* create the in buffer */
994 CVAL(inbuf2,smb_com) = smb_com2;
996 /* create the out buffer */
997 construct_reply_common(inbuf2, outbuf2);
999 DEBUG(3,("Chained message\n"));
1002 /* process the request */
1003 outsize2 = switch_message(smb_com2,inbuf2,outbuf2,size-chain_size,
1004 bufsize-chain_size);
1006 /* copy the new reply and request headers over the old ones, but
1007 preserve the smb_com field */
1008 memmove(orig_outbuf,outbuf2,smb_wct);
1009 CVAL(orig_outbuf,smb_com) = smb_com1;
1011 /* restore the saved data, being careful not to overwrite any
1012 data from the reply header */
1013 memcpy(inbuf2,inbuf_saved,smb_wct);
1015 int ofs = smb_wct - PTR_DIFF(outbuf2,orig_outbuf);
1016 if (ofs < 0) ofs = 0;
1017 memmove(outbuf2+ofs,outbuf_saved+ofs,smb_wct-ofs);
1023 /****************************************************************************
1024 Setup the needed select timeout.
1025 ****************************************************************************/
1027 static int setup_select_timeout(void)
1033 * Increase the select timeout back to SMBD_SELECT_TIMEOUT if we
1034 * have removed any blocking locks. JRA.
1037 select_timeout = blocking_locks_pending() ? SMBD_SELECT_TIMEOUT_WITH_PENDING_LOCKS*1000 :
1038 SMBD_SELECT_TIMEOUT*1000;
1040 t = change_notify_timeout();
1041 if (t != -1) select_timeout = MIN(select_timeout, t*1000);
1043 return select_timeout;
1046 /****************************************************************************
1047 Check if services need reloading.
1048 ****************************************************************************/
1050 void check_reload(int t)
1052 static time_t last_smb_conf_reload_time = 0;
1054 if(last_smb_conf_reload_time == 0)
1055 last_smb_conf_reload_time = t;
1057 if (reload_after_sighup || (t >= last_smb_conf_reload_time+SMBD_RELOAD_CHECK))
1059 reload_services(True);
1060 reload_after_sighup = False;
1061 last_smb_conf_reload_time = t;
1065 /****************************************************************************
1066 Process any timeout housekeeping. Return False if the caller should exit.
1067 ****************************************************************************/
1069 static BOOL timeout_processing(int deadtime, int *select_timeout, time_t *last_timeout_processing_time)
1071 static time_t last_keepalive_sent_time = 0;
1072 static time_t last_idle_closed_check = 0;
1074 BOOL allidle = True;
1075 extern int keepalive;
1077 if (smb_read_error == READ_EOF)
1079 DEBUG(3,("end of file from client\n"));
1083 if (smb_read_error == READ_ERROR)
1085 DEBUG(3,("receive_smb error (%s) exiting\n",
1090 *last_timeout_processing_time = t = time(NULL);
1092 if(last_keepalive_sent_time == 0)
1093 last_keepalive_sent_time = t;
1095 if(last_idle_closed_check == 0)
1096 last_idle_closed_check = t;
1098 /* become root again if waiting */
1101 /* check if we need to reload services */
1104 /* automatic timeout if all connections are closed */
1105 if (conn_num_open()==0 && (t - last_idle_closed_check) >= IDLE_CLOSED_TIMEOUT)
1107 DEBUG( 2, ( "Closing idle connection\n" ) );
1111 last_idle_closed_check = t;
1113 if (keepalive && (t - last_keepalive_sent_time)>keepalive)
1115 struct cli_state *cli = server_client();
1116 if (!send_keepalive(smbd_server_fd())) {
1117 DEBUG( 2, ( "Keepalive failed - exiting.\n" ) );
1120 /* also send a keepalive to the password server if its still
1122 if (cli && cli->initialised)
1123 if (!send_keepalive(cli->fd)) {
1124 DEBUG( 2, ( "password server keepalive failed.\n"));
1127 last_keepalive_sent_time = t;
1130 /* check for connection timeouts */
1131 allidle = conn_idle_all(t, deadtime);
1133 if (allidle && conn_num_open()>0) {
1134 DEBUG(2,("Closing idle connection 2.\n"));
1138 if(global_machine_password_needs_changing)
1140 unsigned char trust_passwd_hash[16];
1142 pstring remote_machine_list;
1145 * We're in domain level security, and the code that
1146 * read the machine password flagged that the machine
1147 * password needs changing.
1151 * First, open the machine password file with an exclusive lock.
1154 if(!secrets_fetch_trust_account_password(global_myworkgroup, trust_passwd_hash, &lct)) {
1155 DEBUG(0,("process: unable to read the machine account password for \
1156 machine %s in domain %s.\n", global_myname, global_myworkgroup ));
1161 * Make sure someone else hasn't already done this.
1164 if(t < lct + lp_machine_password_timeout()) {
1165 global_machine_password_needs_changing = False;
1169 pstrcpy(remote_machine_list, lp_passwordserver());
1171 change_trust_account_password( global_myworkgroup, remote_machine_list);
1172 global_machine_password_needs_changing = False;
1176 * Check to see if we have any blocking locks
1177 * outstanding on the queue.
1179 process_blocking_lock_queue(t);
1182 * Check to see if we have any change notifies
1183 * outstanding on the queue.
1185 process_pending_change_notify_queue(t);
1188 * Now we are root, check if the log files need pruning.
1189 * Force a log file check.
1191 force_check_log_size();
1195 * Modify the select timeout depending upon
1196 * what we have remaining in our queues.
1199 *select_timeout = setup_select_timeout();
1204 /****************************************************************************
1205 process commands from the client
1206 ****************************************************************************/
1208 void smbd_process(void)
1210 extern int smb_echo_count;
1211 time_t last_timeout_processing_time = time(NULL);
1212 unsigned int num_smbs = 0;
1214 InBuffer = (char *)malloc(BUFFER_SIZE + LARGE_WRITEX_HDR_SIZE + SAFETY_MARGIN);
1215 OutBuffer = (char *)malloc(BUFFER_SIZE + LARGE_WRITEX_HDR_SIZE + SAFETY_MARGIN);
1216 if ((InBuffer == NULL) || (OutBuffer == NULL))
1219 max_recv = MIN(lp_maxxmit(),BUFFER_SIZE);
1221 /* re-initialise the timezone */
1224 /* register our message handlers */
1225 message_register(MSG_SMB_FORCE_TDIS, msg_force_tdis);
1228 int deadtime = lp_deadtime()*60;
1229 int select_timeout = setup_select_timeout();
1233 deadtime = DEFAULT_SMBD_TIMEOUT;
1237 /* free up temporary memory */
1239 main_loop_talloc_free();
1241 while (!receive_message_or_smb(InBuffer,BUFFER_SIZE+LARGE_WRITEX_HDR_SIZE,select_timeout)) {
1242 if(!timeout_processing( deadtime, &select_timeout, &last_timeout_processing_time))
1244 num_smbs = 0; /* Reset smb counter. */
1248 * Ensure we do timeout processing if the SMB we just got was
1249 * only an echo request. This allows us to set the select
1250 * timeout in 'receive_message_or_smb()' to any value we like
1251 * without worrying that the client will send echo requests
1252 * faster than the select timeout, thus starving out the
1253 * essential processing (change notify, blocking locks) that
1254 * the timeout code does. JRA.
1256 num_echos = smb_echo_count;
1258 process_smb(InBuffer, OutBuffer);
1260 if (smb_echo_count != num_echos) {
1261 if(!timeout_processing( deadtime, &select_timeout, &last_timeout_processing_time))
1263 num_smbs = 0; /* Reset smb counter. */
1269 * If we are getting smb requests in a constant stream
1270 * with no echos, make sure we attempt timeout processing
1271 * every select_timeout milliseconds - but only check for this
1272 * every 200 smb requests.
1275 if ((num_smbs % 200) == 0) {
1276 time_t new_check_time = time(NULL);
1277 if(new_check_time - last_timeout_processing_time >= (select_timeout/1000)) {
1278 if(!timeout_processing( deadtime, &select_timeout, &last_timeout_processing_time))
1280 num_smbs = 0; /* Reset smb counter. */
1281 last_timeout_processing_time = new_check_time; /* Reset time. */