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 free((char *)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);
215 /* something is wrong. Maybe the socket is dead? */
216 smb_read_error = READ_ERROR;
220 /* Did we timeout ? */
222 smb_read_error = READ_TIMEOUT;
226 if (!FD_ISSET(smbd_server_fd(),&fds) || selrtn > 1) {
227 async_processing(&fds, buffer, buffer_len);
228 if (!FD_ISSET(smbd_server_fd(),&fds)) goto again;
231 return receive_smb(smbd_server_fd(), buffer, 0);
234 /****************************************************************************
235 Get the next SMB packet, doing the local message processing automatically.
236 ****************************************************************************/
238 BOOL receive_next_smb(char *inbuf, int bufsize, int timeout)
244 ret = receive_message_or_smb(inbuf,bufsize,timeout);
246 got_keepalive = (ret && (CVAL(inbuf,0) == 0x85));
247 } while (ret && got_keepalive);
252 /****************************************************************************
253 We're terminating and have closed all our files/connections etc.
254 If there are any pending local messages we need to respond to them
255 before termination so that other smbds don't think we just died whilst
257 ****************************************************************************/
259 void respond_to_all_remaining_local_messages(void)
265 * Assert we have no exclusive open oplocks.
268 if(get_number_of_exclusive_open_oplocks()) {
269 DEBUG(0,("respond_to_all_remaining_local_messages: PANIC : we have %d exclusive oplocks.\n",
270 get_number_of_exclusive_open_oplocks() ));
275 * Setup the select read fd set.
279 if(!setup_oplock_select_set(&fds))
283 * Keep doing receive_local_message with a 1 ms timeout until
284 * we have no more messages.
286 while(receive_local_message(&fds, buffer, sizeof(buffer), 1)) {
287 /* Deal with oplock break requests from other smbd's. */
288 process_local_message(buffer, sizeof(buffer));
291 (void)setup_oplock_select_set(&fds);
299 These flags determine some of the permissions required to do an operation
301 Note that I don't set NEED_WRITE on some write operations because they
302 are used by some brain-dead clients when printing, and I don't want to
303 force write permissions on print services.
305 #define AS_USER (1<<0)
306 #define NEED_WRITE (1<<1)
307 #define TIME_INIT (1<<2)
308 #define CAN_IPC (1<<3)
309 #define AS_GUEST (1<<5)
310 #define QUEUE_IN_OPLOCK (1<<6)
313 define a list of possible SMB messages and their corresponding
314 functions. Any message that has a NULL function is unimplemented -
315 please feel free to contribute implementations!
317 struct smb_message_struct
320 int (*fn)(connection_struct *conn, char *, char *, int, int);
323 smb_messages[256] = {
325 /* 0x00 */ { "SMBmkdir",reply_mkdir,AS_USER | NEED_WRITE},
326 /* 0x01 */ { "SMBrmdir",reply_rmdir,AS_USER | NEED_WRITE},
327 /* 0x02 */ { "SMBopen",reply_open,AS_USER | QUEUE_IN_OPLOCK },
328 /* 0x03 */ { "SMBcreate",reply_mknew,AS_USER},
329 /* 0x04 */ { "SMBclose",reply_close,AS_USER | CAN_IPC },
330 /* 0x05 */ { "SMBflush",reply_flush,AS_USER},
331 /* 0x06 */ { "SMBunlink",reply_unlink,AS_USER | NEED_WRITE | QUEUE_IN_OPLOCK},
332 /* 0x07 */ { "SMBmv",reply_mv,AS_USER | NEED_WRITE | QUEUE_IN_OPLOCK},
333 /* 0x08 */ { "SMBgetatr",reply_getatr,AS_USER},
334 /* 0x09 */ { "SMBsetatr",reply_setatr,AS_USER | NEED_WRITE},
335 /* 0x0a */ { "SMBread",reply_read,AS_USER},
336 /* 0x0b */ { "SMBwrite",reply_write,AS_USER | CAN_IPC },
337 /* 0x0c */ { "SMBlock",reply_lock,AS_USER},
338 /* 0x0d */ { "SMBunlock",reply_unlock,AS_USER},
339 /* 0x0e */ { "SMBctemp",reply_ctemp,AS_USER | QUEUE_IN_OPLOCK },
340 /* 0x0f */ { "SMBmknew",reply_mknew,AS_USER},
341 /* 0x10 */ { "SMBchkpth",reply_chkpth,AS_USER},
342 /* 0x11 */ { "SMBexit",reply_exit,0},
343 /* 0x12 */ { "SMBlseek",reply_lseek,AS_USER},
344 /* 0x13 */ { "SMBlockread",reply_lockread,AS_USER},
345 /* 0x14 */ { "SMBwriteunlock",reply_writeunlock,AS_USER},
346 /* 0x15 */ { NULL, NULL, 0 },
347 /* 0x16 */ { NULL, NULL, 0 },
348 /* 0x17 */ { NULL, NULL, 0 },
349 /* 0x18 */ { NULL, NULL, 0 },
350 /* 0x19 */ { NULL, NULL, 0 },
351 /* 0x1a */ { "SMBreadbraw",reply_readbraw,AS_USER},
352 /* 0x1b */ { "SMBreadBmpx",reply_readbmpx,AS_USER},
353 /* 0x1c */ { "SMBreadBs",NULL,AS_USER},
354 /* 0x1d */ { "SMBwritebraw",reply_writebraw,AS_USER},
355 /* 0x1e */ { "SMBwriteBmpx",reply_writebmpx,AS_USER},
356 /* 0x1f */ { "SMBwriteBs",reply_writebs,AS_USER},
357 /* 0x20 */ { "SMBwritec",NULL,AS_USER},
358 /* 0x21 */ { NULL, NULL, 0 },
359 /* 0x22 */ { "SMBsetattrE",reply_setattrE,AS_USER | NEED_WRITE },
360 /* 0x23 */ { "SMBgetattrE",reply_getattrE,AS_USER },
361 /* 0x24 */ { "SMBlockingX",reply_lockingX,AS_USER },
362 /* 0x25 */ { "SMBtrans",reply_trans,AS_USER | CAN_IPC | QUEUE_IN_OPLOCK},
363 /* 0x26 */ { "SMBtranss",NULL,AS_USER | CAN_IPC},
364 /* 0x27 */ { "SMBioctl",reply_ioctl,0},
365 /* 0x28 */ { "SMBioctls",NULL,AS_USER},
366 /* 0x29 */ { "SMBcopy",reply_copy,AS_USER | NEED_WRITE | QUEUE_IN_OPLOCK },
367 /* 0x2a */ { "SMBmove",NULL,AS_USER | NEED_WRITE | QUEUE_IN_OPLOCK },
368 /* 0x2b */ { "SMBecho",reply_echo,0},
369 /* 0x2c */ { "SMBwriteclose",reply_writeclose,AS_USER},
370 /* 0x2d */ { "SMBopenX",reply_open_and_X,AS_USER | CAN_IPC | QUEUE_IN_OPLOCK },
371 /* 0x2e */ { "SMBreadX",reply_read_and_X,AS_USER | CAN_IPC },
372 /* 0x2f */ { "SMBwriteX",reply_write_and_X,AS_USER | CAN_IPC },
373 /* 0x30 */ { NULL, NULL, 0 },
374 /* 0x31 */ { NULL, NULL, 0 },
375 /* 0x32 */ { "SMBtrans2", reply_trans2, AS_USER | QUEUE_IN_OPLOCK | CAN_IPC },
376 /* 0x33 */ { "SMBtranss2", reply_transs2, AS_USER},
377 /* 0x34 */ { "SMBfindclose", reply_findclose,AS_USER},
378 /* 0x35 */ { "SMBfindnclose", reply_findnclose, AS_USER},
379 /* 0x36 */ { NULL, NULL, 0 },
380 /* 0x37 */ { NULL, NULL, 0 },
381 /* 0x38 */ { NULL, NULL, 0 },
382 /* 0x39 */ { NULL, NULL, 0 },
383 /* 0x3a */ { NULL, NULL, 0 },
384 /* 0x3b */ { NULL, NULL, 0 },
385 /* 0x3c */ { NULL, NULL, 0 },
386 /* 0x3d */ { NULL, NULL, 0 },
387 /* 0x3e */ { NULL, NULL, 0 },
388 /* 0x3f */ { NULL, NULL, 0 },
389 /* 0x40 */ { NULL, NULL, 0 },
390 /* 0x41 */ { NULL, NULL, 0 },
391 /* 0x42 */ { NULL, NULL, 0 },
392 /* 0x43 */ { NULL, NULL, 0 },
393 /* 0x44 */ { NULL, NULL, 0 },
394 /* 0x45 */ { NULL, NULL, 0 },
395 /* 0x46 */ { NULL, NULL, 0 },
396 /* 0x47 */ { NULL, NULL, 0 },
397 /* 0x48 */ { NULL, NULL, 0 },
398 /* 0x49 */ { NULL, NULL, 0 },
399 /* 0x4a */ { NULL, NULL, 0 },
400 /* 0x4b */ { NULL, NULL, 0 },
401 /* 0x4c */ { NULL, NULL, 0 },
402 /* 0x4d */ { NULL, NULL, 0 },
403 /* 0x4e */ { NULL, NULL, 0 },
404 /* 0x4f */ { NULL, NULL, 0 },
405 /* 0x50 */ { NULL, NULL, 0 },
406 /* 0x51 */ { NULL, NULL, 0 },
407 /* 0x52 */ { NULL, NULL, 0 },
408 /* 0x53 */ { NULL, NULL, 0 },
409 /* 0x54 */ { NULL, NULL, 0 },
410 /* 0x55 */ { NULL, NULL, 0 },
411 /* 0x56 */ { NULL, NULL, 0 },
412 /* 0x57 */ { NULL, NULL, 0 },
413 /* 0x58 */ { NULL, NULL, 0 },
414 /* 0x59 */ { NULL, NULL, 0 },
415 /* 0x5a */ { NULL, NULL, 0 },
416 /* 0x5b */ { NULL, NULL, 0 },
417 /* 0x5c */ { NULL, NULL, 0 },
418 /* 0x5d */ { NULL, NULL, 0 },
419 /* 0x5e */ { NULL, NULL, 0 },
420 /* 0x5f */ { NULL, NULL, 0 },
421 /* 0x60 */ { NULL, NULL, 0 },
422 /* 0x61 */ { NULL, NULL, 0 },
423 /* 0x62 */ { NULL, NULL, 0 },
424 /* 0x63 */ { NULL, NULL, 0 },
425 /* 0x64 */ { NULL, NULL, 0 },
426 /* 0x65 */ { NULL, NULL, 0 },
427 /* 0x66 */ { NULL, NULL, 0 },
428 /* 0x67 */ { NULL, NULL, 0 },
429 /* 0x68 */ { NULL, NULL, 0 },
430 /* 0x69 */ { NULL, NULL, 0 },
431 /* 0x6a */ { NULL, NULL, 0 },
432 /* 0x6b */ { NULL, NULL, 0 },
433 /* 0x6c */ { NULL, NULL, 0 },
434 /* 0x6d */ { NULL, NULL, 0 },
435 /* 0x6e */ { NULL, NULL, 0 },
436 /* 0x6f */ { NULL, NULL, 0 },
437 /* 0x70 */ { "SMBtcon",reply_tcon,0},
438 /* 0x71 */ { "SMBtdis",reply_tdis,0},
439 /* 0x72 */ { "SMBnegprot",reply_negprot,0},
440 /* 0x73 */ { "SMBsesssetupX",reply_sesssetup_and_X,0},
441 /* 0x74 */ { "SMBulogoffX", reply_ulogoffX, 0}, /* ulogoff doesn't give a valid TID */
442 /* 0x75 */ { "SMBtconX",reply_tcon_and_X,0},
443 /* 0x76 */ { NULL, NULL, 0 },
444 /* 0x77 */ { NULL, NULL, 0 },
445 /* 0x78 */ { NULL, NULL, 0 },
446 /* 0x79 */ { NULL, NULL, 0 },
447 /* 0x7a */ { NULL, NULL, 0 },
448 /* 0x7b */ { NULL, NULL, 0 },
449 /* 0x7c */ { NULL, NULL, 0 },
450 /* 0x7d */ { NULL, NULL, 0 },
451 /* 0x7e */ { NULL, NULL, 0 },
452 /* 0x7f */ { NULL, NULL, 0 },
453 /* 0x80 */ { "SMBdskattr",reply_dskattr,AS_USER},
454 /* 0x81 */ { "SMBsearch",reply_search,AS_USER},
455 /* 0x82 */ { "SMBffirst",reply_search,AS_USER},
456 /* 0x83 */ { "SMBfunique",reply_search,AS_USER},
457 /* 0x84 */ { "SMBfclose",reply_fclose,AS_USER},
458 /* 0x85 */ { NULL, NULL, 0 },
459 /* 0x86 */ { NULL, NULL, 0 },
460 /* 0x87 */ { NULL, NULL, 0 },
461 /* 0x88 */ { NULL, NULL, 0 },
462 /* 0x89 */ { NULL, NULL, 0 },
463 /* 0x8a */ { NULL, NULL, 0 },
464 /* 0x8b */ { NULL, NULL, 0 },
465 /* 0x8c */ { NULL, NULL, 0 },
466 /* 0x8d */ { NULL, NULL, 0 },
467 /* 0x8e */ { NULL, NULL, 0 },
468 /* 0x8f */ { NULL, NULL, 0 },
469 /* 0x90 */ { NULL, NULL, 0 },
470 /* 0x91 */ { NULL, NULL, 0 },
471 /* 0x92 */ { NULL, NULL, 0 },
472 /* 0x93 */ { NULL, NULL, 0 },
473 /* 0x94 */ { NULL, NULL, 0 },
474 /* 0x95 */ { NULL, NULL, 0 },
475 /* 0x96 */ { NULL, NULL, 0 },
476 /* 0x97 */ { NULL, NULL, 0 },
477 /* 0x98 */ { NULL, NULL, 0 },
478 /* 0x99 */ { NULL, NULL, 0 },
479 /* 0x9a */ { NULL, NULL, 0 },
480 /* 0x9b */ { NULL, NULL, 0 },
481 /* 0x9c */ { NULL, NULL, 0 },
482 /* 0x9d */ { NULL, NULL, 0 },
483 /* 0x9e */ { NULL, NULL, 0 },
484 /* 0x9f */ { NULL, NULL, 0 },
485 /* 0xa0 */ { "SMBnttrans", reply_nttrans, AS_USER | CAN_IPC | QUEUE_IN_OPLOCK},
486 /* 0xa1 */ { "SMBnttranss", reply_nttranss, AS_USER | CAN_IPC },
487 /* 0xa2 */ { "SMBntcreateX", reply_ntcreate_and_X, AS_USER | CAN_IPC | QUEUE_IN_OPLOCK },
488 /* 0xa3 */ { NULL, NULL, 0 },
489 /* 0xa4 */ { "SMBntcancel", reply_ntcancel, 0 },
490 /* 0xa5 */ { NULL, NULL, 0 },
491 /* 0xa6 */ { NULL, NULL, 0 },
492 /* 0xa7 */ { NULL, NULL, 0 },
493 /* 0xa8 */ { NULL, NULL, 0 },
494 /* 0xa9 */ { NULL, NULL, 0 },
495 /* 0xaa */ { NULL, NULL, 0 },
496 /* 0xab */ { NULL, NULL, 0 },
497 /* 0xac */ { NULL, NULL, 0 },
498 /* 0xad */ { NULL, NULL, 0 },
499 /* 0xae */ { NULL, NULL, 0 },
500 /* 0xaf */ { NULL, NULL, 0 },
501 /* 0xb0 */ { NULL, NULL, 0 },
502 /* 0xb1 */ { NULL, NULL, 0 },
503 /* 0xb2 */ { NULL, NULL, 0 },
504 /* 0xb3 */ { NULL, NULL, 0 },
505 /* 0xb4 */ { NULL, NULL, 0 },
506 /* 0xb5 */ { NULL, NULL, 0 },
507 /* 0xb6 */ { NULL, NULL, 0 },
508 /* 0xb7 */ { NULL, NULL, 0 },
509 /* 0xb8 */ { NULL, NULL, 0 },
510 /* 0xb9 */ { NULL, NULL, 0 },
511 /* 0xba */ { NULL, NULL, 0 },
512 /* 0xbb */ { NULL, NULL, 0 },
513 /* 0xbc */ { NULL, NULL, 0 },
514 /* 0xbd */ { NULL, NULL, 0 },
515 /* 0xbe */ { NULL, NULL, 0 },
516 /* 0xbf */ { NULL, NULL, 0 },
517 /* 0xc0 */ { "SMBsplopen",reply_printopen,AS_USER | QUEUE_IN_OPLOCK },
518 /* 0xc1 */ { "SMBsplwr",reply_printwrite,AS_USER},
519 /* 0xc2 */ { "SMBsplclose",reply_printclose,AS_USER},
520 /* 0xc3 */ { "SMBsplretq",reply_printqueue,AS_USER},
521 /* 0xc4 */ { NULL, NULL, 0 },
522 /* 0xc5 */ { NULL, NULL, 0 },
523 /* 0xc6 */ { NULL, NULL, 0 },
524 /* 0xc7 */ { NULL, NULL, 0 },
525 /* 0xc8 */ { NULL, NULL, 0 },
526 /* 0xc9 */ { NULL, NULL, 0 },
527 /* 0xca */ { NULL, NULL, 0 },
528 /* 0xcb */ { NULL, NULL, 0 },
529 /* 0xcc */ { NULL, NULL, 0 },
530 /* 0xcd */ { NULL, NULL, 0 },
531 /* 0xce */ { NULL, NULL, 0 },
532 /* 0xcf */ { NULL, NULL, 0 },
533 /* 0xd0 */ { "SMBsends",reply_sends,AS_GUEST},
534 /* 0xd1 */ { "SMBsendb",NULL,AS_GUEST},
535 /* 0xd2 */ { "SMBfwdname",NULL,AS_GUEST},
536 /* 0xd3 */ { "SMBcancelf",NULL,AS_GUEST},
537 /* 0xd4 */ { "SMBgetmac",NULL,AS_GUEST},
538 /* 0xd5 */ { "SMBsendstrt",reply_sendstrt,AS_GUEST},
539 /* 0xd6 */ { "SMBsendend",reply_sendend,AS_GUEST},
540 /* 0xd7 */ { "SMBsendtxt",reply_sendtxt,AS_GUEST},
541 /* 0xd8 */ { NULL, NULL, 0 },
542 /* 0xd9 */ { NULL, NULL, 0 },
543 /* 0xda */ { NULL, NULL, 0 },
544 /* 0xdb */ { NULL, NULL, 0 },
545 /* 0xdc */ { NULL, NULL, 0 },
546 /* 0xdd */ { NULL, NULL, 0 },
547 /* 0xde */ { NULL, NULL, 0 },
548 /* 0xdf */ { NULL, NULL, 0 },
549 /* 0xe0 */ { NULL, NULL, 0 },
550 /* 0xe1 */ { NULL, NULL, 0 },
551 /* 0xe2 */ { NULL, NULL, 0 },
552 /* 0xe3 */ { NULL, NULL, 0 },
553 /* 0xe4 */ { NULL, NULL, 0 },
554 /* 0xe5 */ { NULL, NULL, 0 },
555 /* 0xe6 */ { NULL, NULL, 0 },
556 /* 0xe7 */ { NULL, NULL, 0 },
557 /* 0xe8 */ { NULL, NULL, 0 },
558 /* 0xe9 */ { NULL, NULL, 0 },
559 /* 0xea */ { NULL, NULL, 0 },
560 /* 0xeb */ { NULL, NULL, 0 },
561 /* 0xec */ { NULL, NULL, 0 },
562 /* 0xed */ { NULL, NULL, 0 },
563 /* 0xee */ { NULL, NULL, 0 },
564 /* 0xef */ { NULL, NULL, 0 },
565 /* 0xf0 */ { NULL, NULL, 0 },
566 /* 0xf1 */ { NULL, NULL, 0 },
567 /* 0xf2 */ { NULL, NULL, 0 },
568 /* 0xf3 */ { NULL, NULL, 0 },
569 /* 0xf4 */ { NULL, NULL, 0 },
570 /* 0xf5 */ { NULL, NULL, 0 },
571 /* 0xf6 */ { NULL, NULL, 0 },
572 /* 0xf7 */ { NULL, NULL, 0 },
573 /* 0xf8 */ { NULL, NULL, 0 },
574 /* 0xf9 */ { NULL, NULL, 0 },
575 /* 0xfa */ { NULL, NULL, 0 },
576 /* 0xfb */ { NULL, NULL, 0 },
577 /* 0xfc */ { NULL, NULL, 0 },
578 /* 0xfd */ { NULL, NULL, 0 },
579 /* 0xfe */ { NULL, NULL, 0 },
580 /* 0xff */ { NULL, NULL, 0 }
584 /*******************************************************************
586 ********************************************************************/
587 static void smb_dump(char *name, int type, char *data, ssize_t len)
591 if (DEBUGLEVEL < 50) return;
593 if (len < 4) len = smb_len(data)+4;
594 for (i=1;i<100;i++) {
595 slprintf(fname,sizeof(fname)-1, "/tmp/%s.%d.%s", name, i,
596 type ? "req" : "resp");
597 fd = open(fname, O_WRONLY|O_CREAT|O_EXCL, 0644);
598 if (fd != -1 || errno != EEXIST) break;
601 write(fd, data, len);
603 DEBUG(0,("created %s len %d\n", fname, len));
608 /****************************************************************************
609 do a switch on the message type, and return the response size
610 ****************************************************************************/
611 static int switch_message(int type,char *inbuf,char *outbuf,int size,int bufsize)
613 static pid_t pid= (pid_t)-1;
615 extern int global_smbpid;
619 if (pid == (pid_t)-1)
625 /* make sure this is an SMB packet */
626 if (strncmp(smb_base(inbuf),"\377SMB",4) != 0)
628 DEBUG(2,("Non-SMB packet of length %d\n",smb_len(inbuf)));
632 /* yuck! this is an interim measure before we get rid of our
633 current inbuf/outbuf system */
634 global_smbpid = SVAL(inbuf,smb_pid);
636 if (smb_messages[type].fn == NULL)
638 DEBUG(0,("Unknown message type %d!\n",type));
639 smb_dump("Unknown", 1, inbuf, size);
640 outsize = reply_unknown(inbuf,outbuf);
644 int flags = smb_messages[type].flags;
645 static uint16 last_session_tag = UID_FIELD_INVALID;
646 /* In share mode security we must ignore the vuid. */
647 uint16 session_tag = (lp_security() == SEC_SHARE) ? UID_FIELD_INVALID : SVAL(inbuf,smb_uid);
648 connection_struct *conn = conn_find(SVAL(inbuf,smb_tid));
650 DEBUG(3,("switch message %s (pid %d)\n",smb_fn_name(type),(int)pid));
652 smb_dump(smb_fn_name(type), 1, inbuf, size);
653 if(global_oplock_break)
655 if(flags & QUEUE_IN_OPLOCK)
658 * Queue this message as we are the process of an oplock break.
661 DEBUG( 2, ( "switch_message: queueing message due to being in " ) );
662 DEBUGADD( 2, ( "oplock break state.\n" ) );
664 push_oplock_pending_smb_message( inbuf, size );
669 /* Ensure this value is replaced in the incoming packet. */
670 SSVAL(inbuf,smb_uid,session_tag);
673 * Ensure the correct username is in current_user_info.
674 * This is a really ugly bugfix for problems with
675 * multiple session_setup_and_X's being done and
676 * allowing %U and %G substitutions to work correctly.
677 * There is a reason this code is done here, don't
678 * move it unless you know what you're doing... :-).
682 if (session_tag != last_session_tag) {
683 user_struct *vuser = NULL;
685 last_session_tag = session_tag;
686 if(session_tag != UID_FIELD_INVALID)
687 vuser = get_valid_user_struct(session_tag);
689 current_user_info = vuser->user;
692 /* does this protocol need to be run as root? */
693 if (!(flags & AS_USER))
696 /* does this protocol need a valid tree connection? */
697 if ((flags & AS_USER) && !conn) {
698 return ERROR(ERRSRV, ERRinvnid);
702 /* does this protocol need to be run as the connected user? */
703 if ((flags & AS_USER) && !become_user(conn,session_tag)) {
704 if (flags & AS_GUEST)
707 return(ERROR(ERRSRV,ERRaccess));
710 /* this code is to work around a bug is MS client 3 without
711 introducing a security hole - it needs to be able to do
712 print queue checks as guest if it isn't logged in properly */
716 /* does it need write permission? */
717 if ((flags & NEED_WRITE) && !CAN_WRITE(conn))
718 return(ERROR(ERRSRV,ERRaccess));
720 /* ipc services are limited */
721 if (IS_IPC(conn) && (flags & AS_USER) && !(flags & CAN_IPC)) {
722 return(ERROR(ERRSRV,ERRaccess));
725 /* load service specific parameters */
726 if (conn && !become_service(conn,(flags & AS_USER)?True:False)) {
727 return(ERROR(ERRSRV,ERRaccess));
730 /* does this protocol need to be run as guest? */
731 if ((flags & AS_GUEST) &&
733 !check_access(smbd_server_fd(), lp_hostsallow(-1), lp_hostsdeny(-1)))) {
734 return(ERROR(ERRSRV,ERRaccess));
739 outsize = smb_messages[type].fn(conn, inbuf,outbuf,size,bufsize);
742 smb_dump(smb_fn_name(type), 0, outbuf, outsize);
748 /****************************************************************************
749 construct a reply to the incoming packet
750 ****************************************************************************/
751 static int construct_reply(char *inbuf,char *outbuf,int size,int bufsize)
753 int type = CVAL(inbuf,smb_com);
755 int msg_type = CVAL(inbuf,0);
757 GetTimeOfDay(&smb_last_time);
764 return(reply_special(inbuf,outbuf));
766 construct_reply_common(inbuf, outbuf);
768 outsize = switch_message(type,inbuf,outbuf,size,bufsize);
770 outsize += chain_size;
773 smb_setlen(outbuf,outsize - 4);
777 /****************************************************************************
778 Keep track of the number of running smbd's. This functionality is used to
779 'hard' limit Samba overhead on resource constrained systems.
780 ****************************************************************************/
781 static BOOL smbd_process_limit(void)
785 if (lp_max_smbd_processes()) {
787 /* Always add one to the smbd process count, as exit_server() always
791 total_smbds = 1; /* In case we need to create the entry. */
793 if (tdb_change_int_atomic(conn_tdb_ctx(), "INFO/total_smbds", &total_smbds, 1) == -1)
796 return total_smbds > lp_max_smbd_processes();
802 /****************************************************************************
803 process an smb from the client - split out from the process() code so
804 it can be used by the oplock break code.
805 ****************************************************************************/
806 void process_smb(char *inbuf, char *outbuf)
809 extern BOOL sslEnabled; /* don't use function for performance reasons */
810 static int sslConnected = 0;
811 #endif /* WITH_SSL */
812 static int trans_num;
813 int msg_type = CVAL(inbuf,0);
814 int32 len = smb_len(inbuf);
817 DO_PROFILE_INC(smb_count);
819 if (trans_num == 0) {
820 /* on the first packet, check the global hosts allow/ hosts
821 deny parameters before doing any parsing of the packet
822 passed to us by the client. This prevents attacks on our
823 parsing code from hosts not in the hosts allow list */
824 if (smbd_process_limit() ||
825 !check_access(smbd_server_fd(), lp_hostsallow(-1), lp_hostsdeny(-1))) {
826 /* send a negative session response "not listening on calling
828 static unsigned char buf[5] = {0x83, 0, 0, 1, 0x81};
829 DEBUG( 1, ( "Connection denied from %s\n",
831 (void)send_smb(smbd_server_fd(),(char *)buf);
832 exit_server("connection denied");
836 DEBUG( 6, ( "got message type 0x%x of len 0x%x\n", msg_type, len ) );
837 DEBUG( 3, ( "Transaction %d of length %d\n", trans_num, nread ) );
840 if(sslEnabled && !sslConnected){
841 sslConnected = sslutil_negotiate_ssl(smbd_server_fd(), msg_type);
842 if(sslConnected < 0){ /* an error occured */
843 exit_server("SSL negotiation failed");
844 }else if(sslConnected){
849 #endif /* WITH_SSL */
853 else if(msg_type == 0x85)
854 return; /* Keepalive packet. */
856 nread = construct_reply(inbuf,outbuf,nread,max_send);
860 if (CVAL(outbuf,0) == 0)
863 if (nread != smb_len(outbuf) + 4)
865 DEBUG(0,("ERROR: Invalid message response size! %d %d\n",
866 nread, smb_len(outbuf)));
869 if (!send_smb(smbd_server_fd(),outbuf))
870 exit_server("process_smb: send_smb failed.\n");
877 /****************************************************************************
878 return a string containing the function name of a SMB command
879 ****************************************************************************/
880 char *smb_fn_name(int type)
882 static char *unknown_name = "SMBunknown";
884 if (smb_messages[type].name == NULL)
885 return(unknown_name);
887 return(smb_messages[type].name);
891 /****************************************************************************
892 Helper function for contruct_reply.
893 ****************************************************************************/
895 void construct_reply_common(char *inbuf,char *outbuf)
897 memset(outbuf,'\0',smb_size);
899 set_message(outbuf,0,0,True);
900 CVAL(outbuf,smb_com) = CVAL(inbuf,smb_com);
902 memcpy(outbuf+4,inbuf+4,4);
903 CVAL(outbuf,smb_rcls) = SMB_SUCCESS;
904 CVAL(outbuf,smb_reh) = 0;
905 SCVAL(outbuf,smb_flg, FLAG_REPLY | (CVAL(inbuf,smb_flg) & FLAG_CASELESS_PATHNAMES)); /* bit 7 set
907 SSVAL(outbuf,smb_flg2,
908 (SVAL(inbuf,smb_flg2)&FLAGS2_UNICODE_STRINGS) | FLAGS2_LONG_PATH_COMPONENTS);
909 /* say we support long filenames */
911 SSVAL(outbuf,smb_err,SMB_SUCCESS);
912 SSVAL(outbuf,smb_tid,SVAL(inbuf,smb_tid));
913 SSVAL(outbuf,smb_pid,SVAL(inbuf,smb_pid));
914 SSVAL(outbuf,smb_uid,SVAL(inbuf,smb_uid));
915 SSVAL(outbuf,smb_mid,SVAL(inbuf,smb_mid));
918 /****************************************************************************
919 construct a chained reply and add it to the already made reply
920 **************************************************************************/
921 int chain_reply(char *inbuf,char *outbuf,int size,int bufsize)
923 static char *orig_inbuf;
924 static char *orig_outbuf;
925 int smb_com1, smb_com2 = CVAL(inbuf,smb_vwv0);
926 unsigned smb_off2 = SVAL(inbuf,smb_vwv1);
927 char *inbuf2, *outbuf2;
929 char inbuf_saved[smb_wct];
930 char outbuf_saved[smb_wct];
931 int wct = CVAL(outbuf,smb_wct);
932 int outsize = smb_size + 2*wct + SVAL(outbuf,smb_vwv0+2*wct);
934 /* maybe its not chained */
935 if (smb_com2 == 0xFF) {
936 CVAL(outbuf,smb_vwv0) = 0xFF;
940 if (chain_size == 0) {
941 /* this is the first part of the chain */
943 orig_outbuf = outbuf;
947 * The original Win95 redirector dies on a reply to
948 * a lockingX and read chain unless the chain reply is
949 * 4 byte aligned. JRA.
952 outsize = (outsize + 3) & ~3;
954 /* we need to tell the client where the next part of the reply will be */
955 SSVAL(outbuf,smb_vwv1,smb_offset(outbuf+outsize,outbuf));
956 CVAL(outbuf,smb_vwv0) = smb_com2;
958 /* remember how much the caller added to the chain, only counting stuff
959 after the parameter words */
960 chain_size += outsize - smb_wct;
962 /* work out pointers into the original packets. The
963 headers on these need to be filled in */
964 inbuf2 = orig_inbuf + smb_off2 + 4 - smb_wct;
965 outbuf2 = orig_outbuf + SVAL(outbuf,smb_vwv1) + 4 - smb_wct;
967 /* remember the original command type */
968 smb_com1 = CVAL(orig_inbuf,smb_com);
970 /* save the data which will be overwritten by the new headers */
971 memcpy(inbuf_saved,inbuf2,smb_wct);
972 memcpy(outbuf_saved,outbuf2,smb_wct);
974 /* give the new packet the same header as the last part of the SMB */
975 memmove(inbuf2,inbuf,smb_wct);
977 /* create the in buffer */
978 CVAL(inbuf2,smb_com) = smb_com2;
980 /* create the out buffer */
981 construct_reply_common(inbuf2, outbuf2);
983 DEBUG(3,("Chained message\n"));
986 /* process the request */
987 outsize2 = switch_message(smb_com2,inbuf2,outbuf2,size-chain_size,
990 /* copy the new reply and request headers over the old ones, but
991 preserve the smb_com field */
992 memmove(orig_outbuf,outbuf2,smb_wct);
993 CVAL(orig_outbuf,smb_com) = smb_com1;
995 /* restore the saved data, being careful not to overwrite any
996 data from the reply header */
997 memcpy(inbuf2,inbuf_saved,smb_wct);
999 int ofs = smb_wct - PTR_DIFF(outbuf2,orig_outbuf);
1000 if (ofs < 0) ofs = 0;
1001 memmove(outbuf2+ofs,outbuf_saved+ofs,smb_wct-ofs);
1007 /****************************************************************************
1008 Setup the needed select timeout.
1009 ****************************************************************************/
1011 static int setup_select_timeout(void)
1017 * Increase the select timeout back to SMBD_SELECT_TIMEOUT if we
1018 * have removed any blocking locks. JRA.
1021 select_timeout = blocking_locks_pending() ? SMBD_SELECT_TIMEOUT_WITH_PENDING_LOCKS*1000 :
1022 SMBD_SELECT_TIMEOUT*1000;
1024 t = change_notify_timeout();
1025 if (t != -1) select_timeout = MIN(select_timeout, t*1000);
1027 return select_timeout;
1030 /****************************************************************************
1031 Check if services need reloading.
1032 ****************************************************************************/
1034 void check_reload(int t)
1036 static time_t last_smb_conf_reload_time = 0;
1038 if(last_smb_conf_reload_time == 0)
1039 last_smb_conf_reload_time = t;
1041 if (reload_after_sighup || (t >= last_smb_conf_reload_time+SMBD_RELOAD_CHECK))
1043 reload_services(True);
1044 reload_after_sighup = False;
1045 last_smb_conf_reload_time = t;
1049 /****************************************************************************
1050 Process any timeout housekeeping. Return False if the caller should exit.
1051 ****************************************************************************/
1053 static BOOL timeout_processing(int deadtime, int *select_timeout, time_t *last_timeout_processing_time)
1055 static time_t last_keepalive_sent_time = 0;
1056 static time_t last_idle_closed_check = 0;
1058 BOOL allidle = True;
1059 extern int keepalive;
1061 if (smb_read_error == READ_EOF)
1063 DEBUG(3,("end of file from client\n"));
1067 if (smb_read_error == READ_ERROR)
1069 DEBUG(3,("receive_smb error (%s) exiting\n",
1074 *last_timeout_processing_time = t = time(NULL);
1076 if(last_keepalive_sent_time == 0)
1077 last_keepalive_sent_time = t;
1079 if(last_idle_closed_check == 0)
1080 last_idle_closed_check = t;
1082 /* become root again if waiting */
1085 /* check if we need to reload services */
1088 /* automatic timeout if all connections are closed */
1089 if (conn_num_open()==0 && (t - last_idle_closed_check) >= IDLE_CLOSED_TIMEOUT)
1091 DEBUG( 2, ( "Closing idle connection\n" ) );
1095 last_idle_closed_check = t;
1097 if (keepalive && (t - last_keepalive_sent_time)>keepalive)
1099 struct cli_state *cli = server_client();
1100 if (!send_keepalive(smbd_server_fd())) {
1101 DEBUG( 2, ( "Keepalive failed - exiting.\n" ) );
1104 /* also send a keepalive to the password server if its still
1106 if (cli && cli->initialised)
1107 send_keepalive(cli->fd);
1108 last_keepalive_sent_time = t;
1111 /* check for connection timeouts */
1112 allidle = conn_idle_all(t, deadtime);
1114 if (allidle && conn_num_open()>0) {
1115 DEBUG(2,("Closing idle connection 2.\n"));
1119 if(global_machine_password_needs_changing)
1121 unsigned char trust_passwd_hash[16];
1123 pstring remote_machine_list;
1126 * We're in domain level security, and the code that
1127 * read the machine password flagged that the machine
1128 * password needs changing.
1132 * First, open the machine password file with an exclusive lock.
1135 if(!secrets_fetch_trust_account_password(global_myworkgroup, trust_passwd_hash, &lct)) {
1136 DEBUG(0,("process: unable to read the machine account password for \
1137 machine %s in domain %s.\n", global_myname, global_myworkgroup ));
1142 * Make sure someone else hasn't already done this.
1145 if(t < lct + lp_machine_password_timeout()) {
1146 global_machine_password_needs_changing = False;
1150 pstrcpy(remote_machine_list, lp_passwordserver());
1152 change_trust_account_password( global_myworkgroup, remote_machine_list);
1153 global_machine_password_needs_changing = False;
1157 * Check to see if we have any blocking locks
1158 * outstanding on the queue.
1160 process_blocking_lock_queue(t);
1163 * Check to see if we have any change notifies
1164 * outstanding on the queue.
1166 process_pending_change_notify_queue(t);
1169 * Now we are root, check if the log files need pruning.
1171 if(need_to_check_log_size())
1175 * Modify the select timeout depending upon
1176 * what we have remaining in our queues.
1179 *select_timeout = setup_select_timeout();
1184 /****************************************************************************
1185 process commands from the client
1186 ****************************************************************************/
1188 void smbd_process(void)
1190 extern int smb_echo_count;
1191 time_t last_timeout_processing_time = time(NULL);
1192 unsigned int num_smbs = 0;
1194 InBuffer = (char *)malloc(BUFFER_SIZE + LARGE_WRITEX_HDR_SIZE + SAFETY_MARGIN);
1195 OutBuffer = (char *)malloc(BUFFER_SIZE + LARGE_WRITEX_HDR_SIZE + SAFETY_MARGIN);
1196 if ((InBuffer == NULL) || (OutBuffer == NULL))
1199 max_recv = MIN(lp_maxxmit(),BUFFER_SIZE);
1201 /* re-initialise the timezone */
1204 /* register our message handlers */
1205 message_register(MSG_SMB_FORCE_TDIS, msg_force_tdis);
1208 int deadtime = lp_deadtime()*60;
1209 int select_timeout = setup_select_timeout();
1213 deadtime = DEFAULT_SMBD_TIMEOUT;
1217 /* free up temporary memory */
1219 main_loop_talloc_free();
1221 while (!receive_message_or_smb(InBuffer,BUFFER_SIZE+LARGE_WRITEX_HDR_SIZE,select_timeout)) {
1222 if(!timeout_processing( deadtime, &select_timeout, &last_timeout_processing_time))
1224 num_smbs = 0; /* Reset smb counter. */
1228 * Ensure we do timeout processing if the SMB we just got was
1229 * only an echo request. This allows us to set the select
1230 * timeout in 'receive_message_or_smb()' to any value we like
1231 * without worrying that the client will send echo requests
1232 * faster than the select timeout, thus starving out the
1233 * essential processing (change notify, blocking locks) that
1234 * the timeout code does. JRA.
1236 num_echos = smb_echo_count;
1238 process_smb(InBuffer, OutBuffer);
1240 if (smb_echo_count != num_echos) {
1241 if(!timeout_processing( deadtime, &select_timeout, &last_timeout_processing_time))
1243 num_smbs = 0; /* Reset smb counter. */
1249 * If we are getting smb requests in a constant stream
1250 * with no echos, make sure we attempt timeout processing
1251 * every select_timeout milliseconds - but only check for this
1252 * every 200 smb requests.
1255 if ((num_smbs % 200) == 0) {
1256 time_t new_check_time = time(NULL);
1257 if(last_timeout_processing_time - new_check_time >= (select_timeout/1000)) {
1258 if(!timeout_processing( deadtime, &select_timeout, &last_timeout_processing_time))
1260 num_smbs = 0; /* Reset smb counter. */
1261 last_timeout_processing_time = new_check_time; /* Reset time. */