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 extern VOLATILE sig_atomic_t reload_after_sighup;
46 extern VOLATILE sig_atomic_t got_sig_term;
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(fd_set *fds, char *buffer, int buffer_len)
114 /* check for oplock messages (both UDP and kernel) */
115 if (receive_local_message(fds, buffer, buffer_len, 0)) {
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 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,NULL,NULL,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) == SMBkeepalive));
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 static 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,0 },
370 /* 0x1d */ { "SMBwritebraw",reply_writebraw,AS_USER},
371 /* 0x1e */ { "SMBwriteBmpx",reply_writebmpx,AS_USER},
372 /* 0x1f */ { "SMBwriteBs",reply_writebs,AS_USER},
373 /* 0x20 */ { "SMBwritec",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 ssize_t ret = write(fd, data, len);
619 DEBUG(0,("smb_dump: problem: write returned %d\n", (int)ret ));
621 DEBUG(0,("created %s len %d\n", fname, len));
626 /****************************************************************************
627 do a switch on the message type, and return the response size
628 ****************************************************************************/
629 static int switch_message(int type,char *inbuf,char *outbuf,int size,int bufsize)
631 static pid_t pid= (pid_t)-1;
633 extern uint16 global_smbpid;
637 if (pid == (pid_t)-1)
643 /* make sure this is an SMB packet */
644 if (strncmp(smb_base(inbuf),"\377SMB",4) != 0)
646 DEBUG(2,("Non-SMB packet of length %d\n",smb_len(inbuf)));
650 /* yuck! this is an interim measure before we get rid of our
651 current inbuf/outbuf system */
652 global_smbpid = SVAL(inbuf,smb_pid);
654 if (smb_messages[type].fn == NULL)
656 DEBUG(0,("Unknown message type %d!\n",type));
657 smb_dump("Unknown", 1, inbuf, size);
658 outsize = reply_unknown(inbuf,outbuf);
662 int flags = smb_messages[type].flags;
663 static uint16 last_session_tag = UID_FIELD_INVALID;
664 /* In share mode security we must ignore the vuid. */
665 uint16 session_tag = (lp_security() == SEC_SHARE) ? UID_FIELD_INVALID : SVAL(inbuf,smb_uid);
666 connection_struct *conn = conn_find(SVAL(inbuf,smb_tid));
668 DEBUG(3,("switch message %s (pid %d)\n",smb_fn_name(type),(int)pid));
670 smb_dump(smb_fn_name(type), 1, inbuf, size);
671 if(global_oplock_break)
673 if(flags & QUEUE_IN_OPLOCK)
676 * Queue this message as we are the process of an oplock break.
679 DEBUG( 2, ( "switch_message: queueing message due to being in " ) );
680 DEBUGADD( 2, ( "oplock break state.\n" ) );
682 push_oplock_pending_smb_message( inbuf, size );
687 /* Ensure this value is replaced in the incoming packet. */
688 SSVAL(inbuf,smb_uid,session_tag);
691 * Ensure the correct username is in current_user_info.
692 * This is a really ugly bugfix for problems with
693 * multiple session_setup_and_X's being done and
694 * allowing %U and %G substitutions to work correctly.
695 * There is a reason this code is done here, don't
696 * move it unless you know what you're doing... :-).
700 if (session_tag != last_session_tag) {
701 user_struct *vuser = NULL;
703 last_session_tag = session_tag;
704 if(session_tag != UID_FIELD_INVALID)
705 vuser = get_valid_user_struct(session_tag);
707 current_user_info = vuser->user;
710 /* does this protocol need to be run as root? */
711 if (!(flags & AS_USER))
712 change_to_root_user();
714 /* does this protocol need a valid tree connection? */
715 if ((flags & AS_USER) && !conn) {
716 return ERROR_DOS(ERRSRV, ERRinvnid);
720 /* does this protocol need to be run as the connected user? */
721 if ((flags & AS_USER) && !change_to_user(conn,session_tag)) {
722 if (flags & AS_GUEST)
725 return(ERROR_DOS(ERRSRV,ERRaccess));
728 /* this code is to work around a bug is MS client 3 without
729 introducing a security hole - it needs to be able to do
730 print queue checks as guest if it isn't logged in properly */
734 /* does it need write permission? */
735 if ((flags & NEED_WRITE) && !CAN_WRITE(conn))
736 return(ERROR_DOS(ERRSRV,ERRaccess));
738 /* ipc services are limited */
739 if (IS_IPC(conn) && (flags & AS_USER) && !(flags & CAN_IPC)) {
740 return(ERROR_DOS(ERRSRV,ERRaccess));
743 /* load service specific parameters */
744 if (conn && !set_current_service(conn,(flags & AS_USER)?True:False)) {
745 return(ERROR_DOS(ERRSRV,ERRaccess));
748 /* does this protocol need to be run as guest? */
749 if ((flags & AS_GUEST) &&
750 (!change_to_guest() ||
751 !check_access(smbd_server_fd(), lp_hostsallow(-1), lp_hostsdeny(-1)))) {
752 return(ERROR_DOS(ERRSRV,ERRaccess));
757 outsize = smb_messages[type].fn(conn, inbuf,outbuf,size,bufsize);
760 smb_dump(smb_fn_name(type), 0, outbuf, outsize);
766 /****************************************************************************
767 construct a reply to the incoming packet
768 ****************************************************************************/
769 static int construct_reply(char *inbuf,char *outbuf,int size,int bufsize)
771 int type = CVAL(inbuf,smb_com);
773 int msg_type = CVAL(inbuf,0);
775 GetTimeOfDay(&smb_last_time);
782 return(reply_special(inbuf,outbuf));
784 construct_reply_common(inbuf, outbuf);
786 outsize = switch_message(type,inbuf,outbuf,size,bufsize);
788 outsize += chain_size;
791 smb_setlen(outbuf,outsize - 4);
795 /****************************************************************************
796 Keep track of the number of running smbd's. This functionality is used to
797 'hard' limit Samba overhead on resource constrained systems.
798 ****************************************************************************/
799 static BOOL smbd_process_limit(void)
803 if (lp_max_smbd_processes()) {
805 /* Always add one to the smbd process count, as exit_server() always
809 total_smbds = 1; /* In case we need to create the entry. */
811 if (!conn_tdb_ctx()) {
812 DEBUG(0,("smbd_process_limit: max smbd processes parameter set with status parameter not \
813 set. Ignoring max smbd restriction.\n"));
817 if (tdb_change_int32_atomic(conn_tdb_ctx(), "INFO/total_smbds", &total_smbds, 1) == -1)
820 return total_smbds > lp_max_smbd_processes();
826 /****************************************************************************
827 process an smb from the client - split out from the smbd_process() code so
828 it can be used by the oplock break code.
829 ****************************************************************************/
830 void process_smb(char *inbuf, char *outbuf)
832 static int trans_num;
833 int msg_type = CVAL(inbuf,0);
834 int32 len = smb_len(inbuf);
837 DO_PROFILE_INC(smb_count);
839 if (trans_num == 0) {
840 /* on the first packet, check the global hosts allow/ hosts
841 deny parameters before doing any parsing of the packet
842 passed to us by the client. This prevents attacks on our
843 parsing code from hosts not in the hosts allow list */
844 if (smbd_process_limit() ||
845 !check_access(smbd_server_fd(), lp_hostsallow(-1), lp_hostsdeny(-1))) {
846 /* send a negative session response "not listening on calling
848 static unsigned char buf[5] = {0x83, 0, 0, 1, 0x81};
849 DEBUG( 1, ( "Connection denied from %s\n",
851 (void)send_smb(smbd_server_fd(),(char *)buf);
852 exit_server("connection denied");
856 DEBUG( 6, ( "got message type 0x%x of len 0x%x\n", msg_type, len ) );
857 DEBUG( 3, ( "Transaction %d of length %d\n", trans_num, nread ) );
861 else if(msg_type == SMBkeepalive)
862 return; /* Keepalive packet. */
864 nread = construct_reply(inbuf,outbuf,nread,max_send);
868 if (CVAL(outbuf,0) == 0)
871 if (nread != smb_len(outbuf) + 4)
873 DEBUG(0,("ERROR: Invalid message response size! %d %d\n",
874 nread, smb_len(outbuf)));
877 if (!send_smb(smbd_server_fd(),outbuf))
878 exit_server("process_smb: send_smb failed.");
885 /****************************************************************************
886 return a string containing the function name of a SMB command
887 ****************************************************************************/
888 char *smb_fn_name(int type)
890 static char *unknown_name = "SMBunknown";
892 if (smb_messages[type].name == NULL)
893 return(unknown_name);
895 return(smb_messages[type].name);
899 /****************************************************************************
900 Helper function for contruct_reply.
901 ****************************************************************************/
903 void construct_reply_common(char *inbuf,char *outbuf)
905 memset(outbuf,'\0',smb_size);
907 set_message(outbuf,0,0,True);
908 SCVAL(outbuf,smb_com,CVAL(inbuf,smb_com));
910 memcpy(outbuf+4,inbuf+4,4);
911 SCVAL(outbuf,smb_rcls,SMB_SUCCESS);
912 SCVAL(outbuf,smb_reh,0);
913 SCVAL(outbuf,smb_flg, FLAG_REPLY | (CVAL(inbuf,smb_flg) & FLAG_CASELESS_PATHNAMES));
914 SSVAL(outbuf,smb_flg2,
915 (SVAL(inbuf,smb_flg2) & FLAGS2_UNICODE_STRINGS) |
916 FLAGS2_LONG_PATH_COMPONENTS |
917 FLAGS2_32_BIT_ERROR_CODES | FLAGS2_EXTENDED_SECURITY);
919 SSVAL(outbuf,smb_err,SMB_SUCCESS);
920 SSVAL(outbuf,smb_tid,SVAL(inbuf,smb_tid));
921 SSVAL(outbuf,smb_pid,SVAL(inbuf,smb_pid));
922 SSVAL(outbuf,smb_uid,SVAL(inbuf,smb_uid));
923 SSVAL(outbuf,smb_mid,SVAL(inbuf,smb_mid));
926 /****************************************************************************
927 construct a chained reply and add it to the already made reply
928 **************************************************************************/
929 int chain_reply(char *inbuf,char *outbuf,int size,int bufsize)
931 static char *orig_inbuf;
932 static char *orig_outbuf;
933 int smb_com1, smb_com2 = CVAL(inbuf,smb_vwv0);
934 unsigned smb_off2 = SVAL(inbuf,smb_vwv1);
935 char *inbuf2, *outbuf2;
937 char inbuf_saved[smb_wct];
938 char outbuf_saved[smb_wct];
939 int wct = CVAL(outbuf,smb_wct);
940 int outsize = smb_size + 2*wct + SVAL(outbuf,smb_vwv0+2*wct);
942 /* maybe its not chained */
943 if (smb_com2 == 0xFF) {
944 SCVAL(outbuf,smb_vwv0,0xFF);
948 if (chain_size == 0) {
949 /* this is the first part of the chain */
951 orig_outbuf = outbuf;
955 * The original Win95 redirector dies on a reply to
956 * a lockingX and read chain unless the chain reply is
957 * 4 byte aligned. JRA.
960 outsize = (outsize + 3) & ~3;
962 /* we need to tell the client where the next part of the reply will be */
963 SSVAL(outbuf,smb_vwv1,smb_offset(outbuf+outsize,outbuf));
964 SCVAL(outbuf,smb_vwv0,smb_com2);
966 /* remember how much the caller added to the chain, only counting stuff
967 after the parameter words */
968 chain_size += outsize - smb_wct;
970 /* work out pointers into the original packets. The
971 headers on these need to be filled in */
972 inbuf2 = orig_inbuf + smb_off2 + 4 - smb_wct;
973 outbuf2 = orig_outbuf + SVAL(outbuf,smb_vwv1) + 4 - smb_wct;
975 /* remember the original command type */
976 smb_com1 = CVAL(orig_inbuf,smb_com);
978 /* save the data which will be overwritten by the new headers */
979 memcpy(inbuf_saved,inbuf2,smb_wct);
980 memcpy(outbuf_saved,outbuf2,smb_wct);
982 /* give the new packet the same header as the last part of the SMB */
983 memmove(inbuf2,inbuf,smb_wct);
985 /* create the in buffer */
986 SCVAL(inbuf2,smb_com,smb_com2);
988 /* create the out buffer */
989 construct_reply_common(inbuf2, outbuf2);
991 DEBUG(3,("Chained message\n"));
994 /* process the request */
995 outsize2 = switch_message(smb_com2,inbuf2,outbuf2,size-chain_size,
998 /* copy the new reply and request headers over the old ones, but
999 preserve the smb_com field */
1000 memmove(orig_outbuf,outbuf2,smb_wct);
1001 SCVAL(orig_outbuf,smb_com,smb_com1);
1003 /* restore the saved data, being careful not to overwrite any
1004 data from the reply header */
1005 memcpy(inbuf2,inbuf_saved,smb_wct);
1007 int ofs = smb_wct - PTR_DIFF(outbuf2,orig_outbuf);
1008 if (ofs < 0) ofs = 0;
1009 memmove(outbuf2+ofs,outbuf_saved+ofs,smb_wct-ofs);
1015 /****************************************************************************
1016 Setup the needed select timeout.
1017 ****************************************************************************/
1019 static int setup_select_timeout(void)
1025 * Increase the select timeout back to SMBD_SELECT_TIMEOUT if we
1026 * have removed any blocking locks. JRA.
1029 select_timeout = blocking_locks_pending() ? SMBD_SELECT_TIMEOUT_WITH_PENDING_LOCKS*1000 :
1030 SMBD_SELECT_TIMEOUT*1000;
1032 t = change_notify_timeout();
1033 if (t != -1) select_timeout = MIN(select_timeout, t*1000);
1035 return select_timeout;
1038 /****************************************************************************
1039 Check if services need reloading.
1040 ****************************************************************************/
1042 void check_reload(int t)
1044 static time_t last_smb_conf_reload_time = 0;
1046 if(last_smb_conf_reload_time == 0)
1047 last_smb_conf_reload_time = t;
1049 if (reload_after_sighup || (t >= last_smb_conf_reload_time+SMBD_RELOAD_CHECK))
1051 reload_services(True);
1052 reload_after_sighup = False;
1053 last_smb_conf_reload_time = t;
1057 /****************************************************************************
1058 Process any timeout housekeeping. Return False if the caller should exit.
1059 ****************************************************************************/
1061 static BOOL timeout_processing(int deadtime, int *select_timeout, time_t *last_timeout_processing_time)
1063 static time_t last_keepalive_sent_time = 0;
1064 static time_t last_idle_closed_check = 0;
1066 BOOL allidle = True;
1067 extern int keepalive;
1069 if (smb_read_error == READ_EOF)
1071 DEBUG(3,("end of file from client\n"));
1075 if (smb_read_error == READ_ERROR)
1077 DEBUG(3,("receive_smb error (%s) exiting\n",
1082 *last_timeout_processing_time = t = time(NULL);
1084 if(last_keepalive_sent_time == 0)
1085 last_keepalive_sent_time = t;
1087 if(last_idle_closed_check == 0)
1088 last_idle_closed_check = t;
1090 /* become root again if waiting */
1091 change_to_root_user();
1093 /* check if we need to reload services */
1096 /* automatic timeout if all connections are closed */
1097 if (conn_num_open()==0 && (t - last_idle_closed_check) >= IDLE_CLOSED_TIMEOUT)
1099 DEBUG( 2, ( "Closing idle connection\n" ) );
1103 last_idle_closed_check = t;
1105 if (keepalive && (t - last_keepalive_sent_time)>keepalive)
1107 extern struct auth_context *negprot_global_auth_context;
1108 if (!send_keepalive(smbd_server_fd())) {
1109 DEBUG( 2, ( "Keepalive failed - exiting.\n" ) );
1113 /* send a keepalive for a password server or the like.
1114 This is attached to the auth_info created in the
1116 if (negprot_global_auth_context
1117 && negprot_global_auth_context->challenge_set_method
1118 && negprot_global_auth_context->challenge_set_method->send_keepalive) {
1119 negprot_global_auth_context->challenge_set_method->send_keepalive
1120 (&negprot_global_auth_context->challenge_set_method->private_data);
1123 last_keepalive_sent_time = t;
1126 /* check for connection timeouts */
1127 allidle = conn_idle_all(t, deadtime);
1129 if (allidle && conn_num_open()>0) {
1130 DEBUG(2,("Closing idle connection 2.\n"));
1134 if(global_machine_password_needs_changing &&
1135 /* for ADS we need to do a regular ADS password change, not a domain
1137 lp_security() == SEC_DOMAIN)
1139 unsigned char trust_passwd_hash[16];
1141 pstring remote_machine_list;
1144 * We're in domain level security, and the code that
1145 * read the machine password flagged that the machine
1146 * password needs changing.
1150 * First, open the machine password file with an exclusive lock.
1153 if(!secrets_fetch_trust_account_password(global_myworkgroup, trust_passwd_hash, &lct)) {
1154 DEBUG(0,("process: unable to read the machine account password for \
1155 machine %s in domain %s.\n", global_myname, global_myworkgroup ));
1160 * Make sure someone else hasn't already done this.
1163 if(t < lct + lp_machine_password_timeout()) {
1164 global_machine_password_needs_changing = False;
1168 pstrcpy(remote_machine_list, lp_passwordserver());
1170 change_trust_account_password( global_myworkgroup, remote_machine_list);
1171 global_machine_password_needs_changing = False;
1175 * Check to see if we have any blocking locks
1176 * outstanding on the queue.
1178 process_blocking_lock_queue(t);
1181 * Check to see if we have any change notifies
1182 * outstanding on the queue.
1184 process_pending_change_notify_queue(t);
1187 * Now we are root, check if the log files need pruning.
1188 * Force a log file check.
1190 force_check_log_size();
1194 * Modify the select timeout depending upon
1195 * what we have remaining in our queues.
1198 *select_timeout = setup_select_timeout();
1203 /****************************************************************************
1204 process commands from the client
1205 ****************************************************************************/
1207 void smbd_process(void)
1209 extern int smb_echo_count;
1210 time_t last_timeout_processing_time = time(NULL);
1211 unsigned int num_smbs = 0;
1213 InBuffer = (char *)malloc(BUFFER_SIZE + LARGE_WRITEX_HDR_SIZE + SAFETY_MARGIN);
1214 OutBuffer = (char *)malloc(BUFFER_SIZE + LARGE_WRITEX_HDR_SIZE + SAFETY_MARGIN);
1215 if ((InBuffer == NULL) || (OutBuffer == NULL))
1218 max_recv = MIN(lp_maxxmit(),BUFFER_SIZE);
1220 /* re-initialise the timezone */
1223 /* register our message handlers */
1224 message_register(MSG_SMB_FORCE_TDIS, msg_force_tdis);
1225 talloc_init_named("dummy!");
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. */