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 struct timeval smb_last_time;
26 static char *InBuffer = NULL;
27 char *OutBuffer = NULL;
28 char *last_inbuf = NULL;
31 * Size of data we can send to client. Set
32 * by the client for all protocols above CORE.
33 * Set by us for CORE protocol.
35 int max_send = BUFFER_SIZE;
37 * Size of the data we can receive. Set by us.
38 * Can be modified by the max xmit parameter.
40 int max_recv = BUFFER_SIZE;
42 extern int last_message;
43 extern int global_oplock_break;
44 extern userdom_struct current_user_info;
45 extern int smb_read_error;
46 extern VOLATILE sig_atomic_t reload_after_sighup;
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 ****************************************************************************/
111 static void async_processing(fd_set *fds, char *buffer, int buffer_len)
113 /* check for oplock messages (both UDP and kernel) */
114 if (receive_local_message(fds, buffer, buffer_len, 0)) {
115 process_local_message(buffer, buffer_len);
118 /* check for async change notify events */
119 process_pending_change_notify_queue(0);
121 /* check for sighup processing */
122 if (reload_after_sighup) {
123 change_to_root_user();
124 DEBUG(1,("Reloading services after SIGHUP\n"));
125 reload_services(False);
126 reload_after_sighup = False;
130 /****************************************************************************
131 Do a select on an two fd's - with timeout.
133 If a local udp message has been pushed onto the
134 queue (this can only happen during oplock break
135 processing) call async_processing()
137 If a pending smb message has been pushed onto the
138 queue (this can only happen during oplock break
139 processing) return this next.
141 If the first smbfd is ready then read an smb from it.
142 if the second (loopback UDP) fd is ready then read a message
143 from it and setup the buffer header to identify the length
145 Returns False on timeout or error.
148 The timeout is in milli seconds
149 ****************************************************************************/
151 static BOOL receive_message_or_smb(char *buffer, int buffer_len, int timeout)
163 * Note that this call must be before processing any SMB
164 * messages as we need to synchronously process any messages
165 * we may have sent to ourselves from the previous SMB.
170 * Check to see if we already have a message on the smb queue.
171 * If so - copy and return it.
173 if(ubi_slCount(&smb_oplock_queue) != 0) {
174 pending_message_list *msg = (pending_message_list *)ubi_slRemHead(&smb_oplock_queue);
175 memcpy(buffer, msg->msg_buf, MIN(buffer_len, msg->msg_len));
177 /* Free the message we just copied. */
178 SAFE_FREE(msg->msg_buf);
181 DEBUG(5,("receive_message_or_smb: returning queued smb message.\n"));
187 * Setup the select read fd set.
191 FD_SET(smbd_server_fd(),&fds);
192 maxfd = setup_oplock_select_set(&fds);
194 to.tv_sec = timeout / 1000;
195 to.tv_usec = (timeout % 1000) * 1000;
197 selrtn = sys_select(MAX(maxfd,smbd_server_fd())+1,&fds,timeout>0?&to:NULL);
199 /* if we get EINTR then maybe we have received an oplock
200 signal - treat this as select returning 1. This is ugly, but
201 is the best we can do until the oplock code knows more about
203 if (selrtn == -1 && errno == EINTR) {
204 async_processing(&fds, buffer, buffer_len);
206 * After async processing we must go and do the select again, as
207 * the state of the flag in fds for the server file descriptor is
208 * indeterminate - we may have done I/O on it in the oplock processing. JRA.
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;
227 * Ensure we process oplock break messages by preference.
228 * This is IMPORTANT ! Otherwise we can starve other processes
229 * sending us an oplock break message. JRA.
232 if (oplock_message_waiting(&fds)) {
233 async_processing(&fds, buffer, buffer_len);
235 * After async processing we must go and do the select again, as
236 * the state of the flag in fds for the server file descriptor is
237 * indeterminate - we may have done I/O on it in the oplock processing. JRA.
242 return receive_smb(smbd_server_fd(), buffer, 0);
245 /****************************************************************************
246 Get the next SMB packet, doing the local message processing automatically.
247 ****************************************************************************/
249 BOOL receive_next_smb(char *inbuf, int bufsize, int timeout)
255 ret = receive_message_or_smb(inbuf,bufsize,timeout);
257 got_keepalive = (ret && (CVAL(inbuf,0) == SMBkeepalive));
258 } while (ret && got_keepalive);
263 /****************************************************************************
264 We're terminating and have closed all our files/connections etc.
265 If there are any pending local messages we need to respond to them
266 before termination so that other smbds don't think we just died whilst
268 ****************************************************************************/
270 void respond_to_all_remaining_local_messages(void)
276 * Assert we have no exclusive open oplocks.
279 if(get_number_of_exclusive_open_oplocks()) {
280 DEBUG(0,("respond_to_all_remaining_local_messages: PANIC : we have %d exclusive oplocks.\n",
281 get_number_of_exclusive_open_oplocks() ));
286 * Setup the select read fd set.
290 if(!setup_oplock_select_set(&fds))
294 * Keep doing receive_local_message with a 1 ms timeout until
295 * we have no more messages.
297 while(receive_local_message(&fds, buffer, sizeof(buffer), 1)) {
298 /* Deal with oplock break requests from other smbd's. */
299 process_local_message(buffer, sizeof(buffer));
302 (void)setup_oplock_select_set(&fds);
310 These flags determine some of the permissions required to do an operation
312 Note that I don't set NEED_WRITE on some write operations because they
313 are used by some brain-dead clients when printing, and I don't want to
314 force write permissions on print services.
316 #define AS_USER (1<<0)
317 #define NEED_WRITE (1<<1)
318 #define TIME_INIT (1<<2)
319 #define CAN_IPC (1<<3)
320 #define AS_GUEST (1<<5)
321 #define QUEUE_IN_OPLOCK (1<<6)
324 define a list of possible SMB messages and their corresponding
325 functions. Any message that has a NULL function is unimplemented -
326 please feel free to contribute implementations!
328 static struct smb_message_struct
331 int (*fn)(connection_struct *conn, char *, char *, int, int);
334 smb_messages[256] = {
336 /* 0x00 */ { "SMBmkdir",reply_mkdir,AS_USER | NEED_WRITE},
337 /* 0x01 */ { "SMBrmdir",reply_rmdir,AS_USER | NEED_WRITE},
338 /* 0x02 */ { "SMBopen",reply_open,AS_USER | QUEUE_IN_OPLOCK },
339 /* 0x03 */ { "SMBcreate",reply_mknew,AS_USER},
340 /* 0x04 */ { "SMBclose",reply_close,AS_USER | CAN_IPC },
341 /* 0x05 */ { "SMBflush",reply_flush,AS_USER},
342 /* 0x06 */ { "SMBunlink",reply_unlink,AS_USER | NEED_WRITE | QUEUE_IN_OPLOCK},
343 /* 0x07 */ { "SMBmv",reply_mv,AS_USER | NEED_WRITE | QUEUE_IN_OPLOCK},
344 /* 0x08 */ { "SMBgetatr",reply_getatr,AS_USER},
345 /* 0x09 */ { "SMBsetatr",reply_setatr,AS_USER | NEED_WRITE},
346 /* 0x0a */ { "SMBread",reply_read,AS_USER},
347 /* 0x0b */ { "SMBwrite",reply_write,AS_USER | CAN_IPC },
348 /* 0x0c */ { "SMBlock",reply_lock,AS_USER},
349 /* 0x0d */ { "SMBunlock",reply_unlock,AS_USER},
350 /* 0x0e */ { "SMBctemp",reply_ctemp,AS_USER | QUEUE_IN_OPLOCK },
351 /* 0x0f */ { "SMBmknew",reply_mknew,AS_USER},
352 /* 0x10 */ { "SMBchkpth",reply_chkpth,AS_USER},
353 /* 0x11 */ { "SMBexit",reply_exit,0},
354 /* 0x12 */ { "SMBlseek",reply_lseek,AS_USER},
355 /* 0x13 */ { "SMBlockread",reply_lockread,AS_USER},
356 /* 0x14 */ { "SMBwriteunlock",reply_writeunlock,AS_USER},
357 /* 0x15 */ { NULL, NULL, 0 },
358 /* 0x16 */ { NULL, NULL, 0 },
359 /* 0x17 */ { NULL, NULL, 0 },
360 /* 0x18 */ { NULL, NULL, 0 },
361 /* 0x19 */ { NULL, NULL, 0 },
362 /* 0x1a */ { "SMBreadbraw",reply_readbraw,AS_USER},
363 /* 0x1b */ { "SMBreadBmpx",reply_readbmpx,AS_USER},
364 /* 0x1c */ { "SMBreadBs",NULL,0 },
365 /* 0x1d */ { "SMBwritebraw",reply_writebraw,AS_USER},
366 /* 0x1e */ { "SMBwriteBmpx",reply_writebmpx,AS_USER},
367 /* 0x1f */ { "SMBwriteBs",reply_writebs,AS_USER},
368 /* 0x20 */ { "SMBwritec",NULL,0},
369 /* 0x21 */ { NULL, NULL, 0 },
370 /* 0x22 */ { "SMBsetattrE",reply_setattrE,AS_USER | NEED_WRITE },
371 /* 0x23 */ { "SMBgetattrE",reply_getattrE,AS_USER },
372 /* 0x24 */ { "SMBlockingX",reply_lockingX,AS_USER },
373 /* 0x25 */ { "SMBtrans",reply_trans,AS_USER | CAN_IPC | QUEUE_IN_OPLOCK},
374 /* 0x26 */ { "SMBtranss",NULL,AS_USER | CAN_IPC},
375 /* 0x27 */ { "SMBioctl",reply_ioctl,0},
376 /* 0x28 */ { "SMBioctls",NULL,AS_USER},
377 /* 0x29 */ { "SMBcopy",reply_copy,AS_USER | NEED_WRITE | QUEUE_IN_OPLOCK },
378 /* 0x2a */ { "SMBmove",NULL,AS_USER | NEED_WRITE | QUEUE_IN_OPLOCK },
379 /* 0x2b */ { "SMBecho",reply_echo,0},
380 /* 0x2c */ { "SMBwriteclose",reply_writeclose,AS_USER},
381 /* 0x2d */ { "SMBopenX",reply_open_and_X,AS_USER | CAN_IPC | QUEUE_IN_OPLOCK },
382 /* 0x2e */ { "SMBreadX",reply_read_and_X,AS_USER | CAN_IPC },
383 /* 0x2f */ { "SMBwriteX",reply_write_and_X,AS_USER | CAN_IPC },
384 /* 0x30 */ { NULL, NULL, 0 },
385 /* 0x31 */ { NULL, NULL, 0 },
386 /* 0x32 */ { "SMBtrans2", reply_trans2, AS_USER | QUEUE_IN_OPLOCK | CAN_IPC },
387 /* 0x33 */ { "SMBtranss2", reply_transs2, AS_USER},
388 /* 0x34 */ { "SMBfindclose", reply_findclose,AS_USER},
389 /* 0x35 */ { "SMBfindnclose", reply_findnclose, AS_USER},
390 /* 0x36 */ { NULL, NULL, 0 },
391 /* 0x37 */ { NULL, NULL, 0 },
392 /* 0x38 */ { NULL, NULL, 0 },
393 /* 0x39 */ { NULL, NULL, 0 },
394 /* 0x3a */ { NULL, NULL, 0 },
395 /* 0x3b */ { NULL, NULL, 0 },
396 /* 0x3c */ { NULL, NULL, 0 },
397 /* 0x3d */ { NULL, NULL, 0 },
398 /* 0x3e */ { NULL, NULL, 0 },
399 /* 0x3f */ { NULL, NULL, 0 },
400 /* 0x40 */ { NULL, NULL, 0 },
401 /* 0x41 */ { NULL, NULL, 0 },
402 /* 0x42 */ { NULL, NULL, 0 },
403 /* 0x43 */ { NULL, NULL, 0 },
404 /* 0x44 */ { NULL, NULL, 0 },
405 /* 0x45 */ { NULL, NULL, 0 },
406 /* 0x46 */ { NULL, NULL, 0 },
407 /* 0x47 */ { NULL, NULL, 0 },
408 /* 0x48 */ { NULL, NULL, 0 },
409 /* 0x49 */ { NULL, NULL, 0 },
410 /* 0x4a */ { NULL, NULL, 0 },
411 /* 0x4b */ { NULL, NULL, 0 },
412 /* 0x4c */ { NULL, NULL, 0 },
413 /* 0x4d */ { NULL, NULL, 0 },
414 /* 0x4e */ { NULL, NULL, 0 },
415 /* 0x4f */ { NULL, NULL, 0 },
416 /* 0x50 */ { NULL, NULL, 0 },
417 /* 0x51 */ { NULL, NULL, 0 },
418 /* 0x52 */ { NULL, NULL, 0 },
419 /* 0x53 */ { NULL, NULL, 0 },
420 /* 0x54 */ { NULL, NULL, 0 },
421 /* 0x55 */ { NULL, NULL, 0 },
422 /* 0x56 */ { NULL, NULL, 0 },
423 /* 0x57 */ { NULL, NULL, 0 },
424 /* 0x58 */ { NULL, NULL, 0 },
425 /* 0x59 */ { NULL, NULL, 0 },
426 /* 0x5a */ { NULL, NULL, 0 },
427 /* 0x5b */ { NULL, NULL, 0 },
428 /* 0x5c */ { NULL, NULL, 0 },
429 /* 0x5d */ { NULL, NULL, 0 },
430 /* 0x5e */ { NULL, NULL, 0 },
431 /* 0x5f */ { NULL, NULL, 0 },
432 /* 0x60 */ { NULL, NULL, 0 },
433 /* 0x61 */ { NULL, NULL, 0 },
434 /* 0x62 */ { NULL, NULL, 0 },
435 /* 0x63 */ { NULL, NULL, 0 },
436 /* 0x64 */ { NULL, NULL, 0 },
437 /* 0x65 */ { NULL, NULL, 0 },
438 /* 0x66 */ { NULL, NULL, 0 },
439 /* 0x67 */ { NULL, NULL, 0 },
440 /* 0x68 */ { NULL, NULL, 0 },
441 /* 0x69 */ { NULL, NULL, 0 },
442 /* 0x6a */ { NULL, NULL, 0 },
443 /* 0x6b */ { NULL, NULL, 0 },
444 /* 0x6c */ { NULL, NULL, 0 },
445 /* 0x6d */ { NULL, NULL, 0 },
446 /* 0x6e */ { NULL, NULL, 0 },
447 /* 0x6f */ { NULL, NULL, 0 },
448 /* 0x70 */ { "SMBtcon",reply_tcon,0},
449 /* 0x71 */ { "SMBtdis",reply_tdis,0},
450 /* 0x72 */ { "SMBnegprot",reply_negprot,0},
451 /* 0x73 */ { "SMBsesssetupX",reply_sesssetup_and_X,0},
452 /* 0x74 */ { "SMBulogoffX", reply_ulogoffX, 0}, /* ulogoff doesn't give a valid TID */
453 /* 0x75 */ { "SMBtconX",reply_tcon_and_X,0},
454 /* 0x76 */ { NULL, NULL, 0 },
455 /* 0x77 */ { NULL, NULL, 0 },
456 /* 0x78 */ { NULL, NULL, 0 },
457 /* 0x79 */ { NULL, NULL, 0 },
458 /* 0x7a */ { NULL, NULL, 0 },
459 /* 0x7b */ { NULL, NULL, 0 },
460 /* 0x7c */ { NULL, NULL, 0 },
461 /* 0x7d */ { NULL, NULL, 0 },
462 /* 0x7e */ { NULL, NULL, 0 },
463 /* 0x7f */ { NULL, NULL, 0 },
464 /* 0x80 */ { "SMBdskattr",reply_dskattr,AS_USER},
465 /* 0x81 */ { "SMBsearch",reply_search,AS_USER},
466 /* 0x82 */ { "SMBffirst",reply_search,AS_USER},
467 /* 0x83 */ { "SMBfunique",reply_search,AS_USER},
468 /* 0x84 */ { "SMBfclose",reply_fclose,AS_USER},
469 /* 0x85 */ { NULL, NULL, 0 },
470 /* 0x86 */ { NULL, NULL, 0 },
471 /* 0x87 */ { NULL, NULL, 0 },
472 /* 0x88 */ { NULL, NULL, 0 },
473 /* 0x89 */ { NULL, NULL, 0 },
474 /* 0x8a */ { NULL, NULL, 0 },
475 /* 0x8b */ { NULL, NULL, 0 },
476 /* 0x8c */ { NULL, NULL, 0 },
477 /* 0x8d */ { NULL, NULL, 0 },
478 /* 0x8e */ { NULL, NULL, 0 },
479 /* 0x8f */ { NULL, NULL, 0 },
480 /* 0x90 */ { NULL, NULL, 0 },
481 /* 0x91 */ { NULL, NULL, 0 },
482 /* 0x92 */ { NULL, NULL, 0 },
483 /* 0x93 */ { NULL, NULL, 0 },
484 /* 0x94 */ { NULL, NULL, 0 },
485 /* 0x95 */ { NULL, NULL, 0 },
486 /* 0x96 */ { NULL, NULL, 0 },
487 /* 0x97 */ { NULL, NULL, 0 },
488 /* 0x98 */ { NULL, NULL, 0 },
489 /* 0x99 */ { NULL, NULL, 0 },
490 /* 0x9a */ { NULL, NULL, 0 },
491 /* 0x9b */ { NULL, NULL, 0 },
492 /* 0x9c */ { NULL, NULL, 0 },
493 /* 0x9d */ { NULL, NULL, 0 },
494 /* 0x9e */ { NULL, NULL, 0 },
495 /* 0x9f */ { NULL, NULL, 0 },
496 /* 0xa0 */ { "SMBnttrans", reply_nttrans, AS_USER | CAN_IPC | QUEUE_IN_OPLOCK},
497 /* 0xa1 */ { "SMBnttranss", reply_nttranss, AS_USER | CAN_IPC },
498 /* 0xa2 */ { "SMBntcreateX", reply_ntcreate_and_X, AS_USER | CAN_IPC | QUEUE_IN_OPLOCK },
499 /* 0xa3 */ { NULL, NULL, 0 },
500 /* 0xa4 */ { "SMBntcancel", reply_ntcancel, 0 },
501 /* 0xa5 */ { NULL, NULL, 0 },
502 /* 0xa6 */ { NULL, NULL, 0 },
503 /* 0xa7 */ { NULL, NULL, 0 },
504 /* 0xa8 */ { NULL, NULL, 0 },
505 /* 0xa9 */ { NULL, NULL, 0 },
506 /* 0xaa */ { NULL, NULL, 0 },
507 /* 0xab */ { NULL, NULL, 0 },
508 /* 0xac */ { NULL, NULL, 0 },
509 /* 0xad */ { NULL, NULL, 0 },
510 /* 0xae */ { NULL, NULL, 0 },
511 /* 0xaf */ { NULL, NULL, 0 },
512 /* 0xb0 */ { NULL, NULL, 0 },
513 /* 0xb1 */ { NULL, NULL, 0 },
514 /* 0xb2 */ { NULL, NULL, 0 },
515 /* 0xb3 */ { NULL, NULL, 0 },
516 /* 0xb4 */ { NULL, NULL, 0 },
517 /* 0xb5 */ { NULL, NULL, 0 },
518 /* 0xb6 */ { NULL, NULL, 0 },
519 /* 0xb7 */ { NULL, NULL, 0 },
520 /* 0xb8 */ { NULL, NULL, 0 },
521 /* 0xb9 */ { NULL, NULL, 0 },
522 /* 0xba */ { NULL, NULL, 0 },
523 /* 0xbb */ { NULL, NULL, 0 },
524 /* 0xbc */ { NULL, NULL, 0 },
525 /* 0xbd */ { NULL, NULL, 0 },
526 /* 0xbe */ { NULL, NULL, 0 },
527 /* 0xbf */ { NULL, NULL, 0 },
528 /* 0xc0 */ { "SMBsplopen",reply_printopen,AS_USER | QUEUE_IN_OPLOCK },
529 /* 0xc1 */ { "SMBsplwr",reply_printwrite,AS_USER},
530 /* 0xc2 */ { "SMBsplclose",reply_printclose,AS_USER},
531 /* 0xc3 */ { "SMBsplretq",reply_printqueue,AS_USER},
532 /* 0xc4 */ { NULL, NULL, 0 },
533 /* 0xc5 */ { NULL, NULL, 0 },
534 /* 0xc6 */ { NULL, NULL, 0 },
535 /* 0xc7 */ { NULL, NULL, 0 },
536 /* 0xc8 */ { NULL, NULL, 0 },
537 /* 0xc9 */ { NULL, NULL, 0 },
538 /* 0xca */ { NULL, NULL, 0 },
539 /* 0xcb */ { NULL, NULL, 0 },
540 /* 0xcc */ { NULL, NULL, 0 },
541 /* 0xcd */ { NULL, NULL, 0 },
542 /* 0xce */ { NULL, NULL, 0 },
543 /* 0xcf */ { NULL, NULL, 0 },
544 /* 0xd0 */ { "SMBsends",reply_sends,AS_GUEST},
545 /* 0xd1 */ { "SMBsendb",NULL,AS_GUEST},
546 /* 0xd2 */ { "SMBfwdname",NULL,AS_GUEST},
547 /* 0xd3 */ { "SMBcancelf",NULL,AS_GUEST},
548 /* 0xd4 */ { "SMBgetmac",NULL,AS_GUEST},
549 /* 0xd5 */ { "SMBsendstrt",reply_sendstrt,AS_GUEST},
550 /* 0xd6 */ { "SMBsendend",reply_sendend,AS_GUEST},
551 /* 0xd7 */ { "SMBsendtxt",reply_sendtxt,AS_GUEST},
552 /* 0xd8 */ { NULL, NULL, 0 },
553 /* 0xd9 */ { NULL, NULL, 0 },
554 /* 0xda */ { NULL, NULL, 0 },
555 /* 0xdb */ { NULL, NULL, 0 },
556 /* 0xdc */ { NULL, NULL, 0 },
557 /* 0xdd */ { NULL, NULL, 0 },
558 /* 0xde */ { NULL, NULL, 0 },
559 /* 0xdf */ { NULL, NULL, 0 },
560 /* 0xe0 */ { NULL, NULL, 0 },
561 /* 0xe1 */ { NULL, NULL, 0 },
562 /* 0xe2 */ { NULL, NULL, 0 },
563 /* 0xe3 */ { NULL, NULL, 0 },
564 /* 0xe4 */ { NULL, NULL, 0 },
565 /* 0xe5 */ { NULL, NULL, 0 },
566 /* 0xe6 */ { NULL, NULL, 0 },
567 /* 0xe7 */ { NULL, NULL, 0 },
568 /* 0xe8 */ { NULL, NULL, 0 },
569 /* 0xe9 */ { NULL, NULL, 0 },
570 /* 0xea */ { NULL, NULL, 0 },
571 /* 0xeb */ { NULL, NULL, 0 },
572 /* 0xec */ { NULL, NULL, 0 },
573 /* 0xed */ { NULL, NULL, 0 },
574 /* 0xee */ { NULL, NULL, 0 },
575 /* 0xef */ { NULL, NULL, 0 },
576 /* 0xf0 */ { NULL, NULL, 0 },
577 /* 0xf1 */ { NULL, NULL, 0 },
578 /* 0xf2 */ { NULL, NULL, 0 },
579 /* 0xf3 */ { NULL, NULL, 0 },
580 /* 0xf4 */ { NULL, NULL, 0 },
581 /* 0xf5 */ { NULL, NULL, 0 },
582 /* 0xf6 */ { NULL, NULL, 0 },
583 /* 0xf7 */ { NULL, NULL, 0 },
584 /* 0xf8 */ { NULL, NULL, 0 },
585 /* 0xf9 */ { NULL, NULL, 0 },
586 /* 0xfa */ { NULL, NULL, 0 },
587 /* 0xfb */ { NULL, NULL, 0 },
588 /* 0xfc */ { NULL, NULL, 0 },
589 /* 0xfd */ { NULL, NULL, 0 },
590 /* 0xfe */ { NULL, NULL, 0 },
591 /* 0xff */ { NULL, NULL, 0 }
595 /*******************************************************************
597 ********************************************************************/
598 static void smb_dump(char *name, int type, char *data, ssize_t len)
602 if (DEBUGLEVEL < 50) return;
604 if (len < 4) len = smb_len(data)+4;
605 for (i=1;i<100;i++) {
606 slprintf(fname,sizeof(fname)-1, "/tmp/%s.%d.%s", name, i,
607 type ? "req" : "resp");
608 fd = open(fname, O_WRONLY|O_CREAT|O_EXCL, 0644);
609 if (fd != -1 || errno != EEXIST) break;
612 write(fd, data, len);
614 DEBUG(0,("created %s len %d\n", fname, len));
619 /****************************************************************************
620 do a switch on the message type, and return the response size
621 ****************************************************************************/
622 static int switch_message(int type,char *inbuf,char *outbuf,int size,int bufsize)
624 static pid_t pid= (pid_t)-1;
626 extern uint16 global_smbpid;
630 if (pid == (pid_t)-1)
636 /* make sure this is an SMB packet */
637 if (strncmp(smb_base(inbuf),"\377SMB",4) != 0)
639 DEBUG(2,("Non-SMB packet of length %d\n",smb_len(inbuf)));
643 /* yuck! this is an interim measure before we get rid of our
644 current inbuf/outbuf system */
645 global_smbpid = SVAL(inbuf,smb_pid);
647 if (smb_messages[type].fn == NULL)
649 DEBUG(0,("Unknown message type %d!\n",type));
650 smb_dump("Unknown", 1, inbuf, size);
651 outsize = reply_unknown(inbuf,outbuf);
655 int flags = smb_messages[type].flags;
656 static uint16 last_session_tag = UID_FIELD_INVALID;
657 /* In share mode security we must ignore the vuid. */
658 uint16 session_tag = (lp_security() == SEC_SHARE) ? UID_FIELD_INVALID : SVAL(inbuf,smb_uid);
659 connection_struct *conn = conn_find(SVAL(inbuf,smb_tid));
661 DEBUG(3,("switch message %s (pid %d)\n",smb_fn_name(type),(int)pid));
663 smb_dump(smb_fn_name(type), 1, inbuf, size);
664 if(global_oplock_break)
666 if(flags & QUEUE_IN_OPLOCK)
669 * Queue this message as we are the process of an oplock break.
672 DEBUG( 2, ( "switch_message: queueing message due to being in " ) );
673 DEBUGADD( 2, ( "oplock break state.\n" ) );
675 push_oplock_pending_smb_message( inbuf, size );
680 /* Ensure this value is replaced in the incoming packet. */
681 SSVAL(inbuf,smb_uid,session_tag);
684 * Ensure the correct username is in current_user_info.
685 * This is a really ugly bugfix for problems with
686 * multiple session_setup_and_X's being done and
687 * allowing %U and %G substitutions to work correctly.
688 * There is a reason this code is done here, don't
689 * move it unless you know what you're doing... :-).
693 if (session_tag != last_session_tag) {
694 user_struct *vuser = NULL;
696 last_session_tag = session_tag;
697 if(session_tag != UID_FIELD_INVALID)
698 vuser = get_valid_user_struct(session_tag);
700 current_user_info = vuser->user;
703 /* does this protocol need to be run as root? */
704 if (!(flags & AS_USER))
705 change_to_root_user();
707 /* does this protocol need a valid tree connection? */
708 if ((flags & AS_USER) && !conn) {
709 return ERROR_DOS(ERRSRV, ERRinvnid);
713 /* does this protocol need to be run as the connected user? */
714 if ((flags & AS_USER) && !change_to_user(conn,session_tag)) {
715 if (flags & AS_GUEST)
718 return(ERROR_DOS(ERRSRV,ERRaccess));
721 /* this code is to work around a bug is MS client 3 without
722 introducing a security hole - it needs to be able to do
723 print queue checks as guest if it isn't logged in properly */
727 /* does it need write permission? */
728 if ((flags & NEED_WRITE) && !CAN_WRITE(conn))
729 return(ERROR_DOS(ERRSRV,ERRaccess));
731 /* ipc services are limited */
732 if (IS_IPC(conn) && (flags & AS_USER) && !(flags & CAN_IPC)) {
733 return(ERROR_DOS(ERRSRV,ERRaccess));
736 /* load service specific parameters */
737 if (conn && !set_current_service(conn,(flags & AS_USER)?True:False)) {
738 return(ERROR_DOS(ERRSRV,ERRaccess));
741 /* does this protocol need to be run as guest? */
742 if ((flags & AS_GUEST) &&
743 (!change_to_guest() ||
744 !check_access(smbd_server_fd(), lp_hostsallow(-1), lp_hostsdeny(-1)))) {
745 return(ERROR_DOS(ERRSRV,ERRaccess));
750 outsize = smb_messages[type].fn(conn, inbuf,outbuf,size,bufsize);
753 smb_dump(smb_fn_name(type), 0, outbuf, outsize);
759 /****************************************************************************
760 construct a reply to the incoming packet
761 ****************************************************************************/
762 static int construct_reply(char *inbuf,char *outbuf,int size,int bufsize)
764 int type = CVAL(inbuf,smb_com);
766 int msg_type = CVAL(inbuf,0);
768 GetTimeOfDay(&smb_last_time);
775 return(reply_special(inbuf,outbuf));
777 construct_reply_common(inbuf, outbuf);
779 outsize = switch_message(type,inbuf,outbuf,size,bufsize);
781 outsize += chain_size;
784 smb_setlen(outbuf,outsize - 4);
788 /****************************************************************************
789 Keep track of the number of running smbd's. This functionality is used to
790 'hard' limit Samba overhead on resource constrained systems.
791 ****************************************************************************/
792 static BOOL smbd_process_limit(void)
796 if (lp_max_smbd_processes()) {
798 /* Always add one to the smbd process count, as exit_server() always
802 total_smbds = 1; /* In case we need to create the entry. */
804 if (!conn_tdb_ctx()) {
805 DEBUG(0,("smbd_process_limit: max smbd processes parameter set with status parameter not \
806 set. Ignoring max smbd restriction.\n"));
810 if (tdb_change_int_atomic(conn_tdb_ctx(), "INFO/total_smbds", &total_smbds, 1) == -1)
813 return total_smbds > lp_max_smbd_processes();
819 /****************************************************************************
820 process an smb from the client - split out from the process() code so
821 it can be used by the oplock break code.
822 ****************************************************************************/
823 void process_smb(char *inbuf, char *outbuf)
826 extern BOOL sslEnabled; /* don't use function for performance reasons */
827 static int sslConnected = 0;
828 #endif /* WITH_SSL */
829 static int trans_num;
830 int msg_type = CVAL(inbuf,0);
831 int32 len = smb_len(inbuf);
834 DO_PROFILE_INC(smb_count);
836 if (trans_num == 0) {
837 /* on the first packet, check the global hosts allow/ hosts
838 deny parameters before doing any parsing of the packet
839 passed to us by the client. This prevents attacks on our
840 parsing code from hosts not in the hosts allow list */
841 if (smbd_process_limit() ||
842 !check_access(smbd_server_fd(), lp_hostsallow(-1), lp_hostsdeny(-1))) {
843 /* send a negative session response "not listening on calling
845 static unsigned char buf[5] = {0x83, 0, 0, 1, 0x81};
846 DEBUG( 1, ( "Connection denied from %s\n",
848 (void)send_smb(smbd_server_fd(),(char *)buf);
849 exit_server("connection denied");
853 DEBUG( 6, ( "got message type 0x%x of len 0x%x\n", msg_type, len ) );
854 DEBUG( 3, ( "Transaction %d of length %d\n", trans_num, nread ) );
857 if(sslEnabled && !sslConnected){
858 sslConnected = sslutil_negotiate_ssl(smbd_server_fd(), msg_type);
859 if(sslConnected < 0){ /* an error occured */
860 exit_server("SSL negotiation failed");
861 }else if(sslConnected){
866 #endif /* WITH_SSL */
870 else if(msg_type == SMBkeepalive)
871 return; /* Keepalive packet. */
873 nread = construct_reply(inbuf,outbuf,nread,max_send);
877 if (CVAL(outbuf,0) == 0)
880 if (nread != smb_len(outbuf) + 4)
882 DEBUG(0,("ERROR: Invalid message response size! %d %d\n",
883 nread, smb_len(outbuf)));
886 if (!send_smb(smbd_server_fd(),outbuf))
887 exit_server("process_smb: send_smb failed.");
894 /****************************************************************************
895 return a string containing the function name of a SMB command
896 ****************************************************************************/
897 char *smb_fn_name(int type)
899 static char *unknown_name = "SMBunknown";
901 if (smb_messages[type].name == NULL)
902 return(unknown_name);
904 return(smb_messages[type].name);
908 /****************************************************************************
909 Helper function for contruct_reply.
910 ****************************************************************************/
912 void construct_reply_common(char *inbuf,char *outbuf)
914 memset(outbuf,'\0',smb_size);
916 set_message(outbuf,0,0,True);
917 CVAL(outbuf,smb_com) = CVAL(inbuf,smb_com);
919 memcpy(outbuf+4,inbuf+4,4);
920 CVAL(outbuf,smb_rcls) = SMB_SUCCESS;
921 CVAL(outbuf,smb_reh) = 0;
922 SCVAL(outbuf,smb_flg, FLAG_REPLY | (CVAL(inbuf,smb_flg) & FLAG_CASELESS_PATHNAMES));
923 SSVAL(outbuf,smb_flg2,
924 FLAGS2_UNICODE_STRINGS | FLAGS2_LONG_PATH_COMPONENTS |
925 FLAGS2_32_BIT_ERROR_CODES | FLAGS2_EXTENDED_SECURITY);
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 */
1099 change_to_root_user();
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 extern auth_authsupplied_info *negprot_global_auth_info;
1116 if (!send_keepalive(smbd_server_fd())) {
1117 DEBUG( 2, ( "Keepalive failed - exiting.\n" ) );
1121 /* send a keepalive for a password server or the like.
1122 This is attached to the auth_info created in the
1124 if (negprot_global_auth_info
1125 && negprot_global_auth_info->challenge_set_method
1126 && negprot_global_auth_info->challenge_set_method->send_keepalive) {
1127 negprot_global_auth_info->challenge_set_method->send_keepalive
1128 (&negprot_global_auth_info->challenge_set_method->private_data);
1131 last_keepalive_sent_time = t;
1134 /* check for connection timeouts */
1135 allidle = conn_idle_all(t, deadtime);
1137 if (allidle && conn_num_open()>0) {
1138 DEBUG(2,("Closing idle connection 2.\n"));
1142 if(global_machine_password_needs_changing &&
1143 /* for ADS we need to do a regular ADS password change, not a domain
1145 lp_security() == SEC_DOMAIN)
1147 unsigned char trust_passwd_hash[16];
1149 pstring remote_machine_list;
1152 * We're in domain level security, and the code that
1153 * read the machine password flagged that the machine
1154 * password needs changing.
1158 * First, open the machine password file with an exclusive lock.
1161 if(!secrets_fetch_trust_account_password(global_myworkgroup, trust_passwd_hash, &lct)) {
1162 DEBUG(0,("process: unable to read the machine account password for \
1163 machine %s in domain %s.\n", global_myname, global_myworkgroup ));
1168 * Make sure someone else hasn't already done this.
1171 if(t < lct + lp_machine_password_timeout()) {
1172 global_machine_password_needs_changing = False;
1176 pstrcpy(remote_machine_list, lp_passwordserver());
1178 change_trust_account_password( global_myworkgroup, remote_machine_list);
1179 global_machine_password_needs_changing = False;
1183 * Check to see if we have any blocking locks
1184 * outstanding on the queue.
1186 process_blocking_lock_queue(t);
1189 * Check to see if we have any change notifies
1190 * outstanding on the queue.
1192 process_pending_change_notify_queue(t);
1195 * Now we are root, check if the log files need pruning.
1196 * Force a log file check.
1198 force_check_log_size();
1202 * Modify the select timeout depending upon
1203 * what we have remaining in our queues.
1206 *select_timeout = setup_select_timeout();
1211 /****************************************************************************
1212 process commands from the client
1213 ****************************************************************************/
1215 void smbd_process(void)
1217 extern int smb_echo_count;
1218 time_t last_timeout_processing_time = time(NULL);
1219 unsigned int num_smbs = 0;
1221 InBuffer = (char *)malloc(BUFFER_SIZE + LARGE_WRITEX_HDR_SIZE + SAFETY_MARGIN);
1222 OutBuffer = (char *)malloc(BUFFER_SIZE + LARGE_WRITEX_HDR_SIZE + SAFETY_MARGIN);
1223 if ((InBuffer == NULL) || (OutBuffer == NULL))
1226 max_recv = MIN(lp_maxxmit(),BUFFER_SIZE);
1228 /* re-initialise the timezone */
1231 /* register our message handlers */
1232 message_register(MSG_SMB_FORCE_TDIS, msg_force_tdis);
1233 register_msg_pool_usage();
1236 int deadtime = lp_deadtime()*60;
1237 int select_timeout = setup_select_timeout();
1241 deadtime = DEFAULT_SMBD_TIMEOUT;
1245 /* free up temporary memory */
1247 main_loop_talloc_free();
1249 while (!receive_message_or_smb(InBuffer,BUFFER_SIZE+LARGE_WRITEX_HDR_SIZE,select_timeout)) {
1250 if(!timeout_processing( deadtime, &select_timeout, &last_timeout_processing_time))
1252 num_smbs = 0; /* Reset smb counter. */
1256 * Ensure we do timeout processing if the SMB we just got was
1257 * only an echo request. This allows us to set the select
1258 * timeout in 'receive_message_or_smb()' to any value we like
1259 * without worrying that the client will send echo requests
1260 * faster than the select timeout, thus starving out the
1261 * essential processing (change notify, blocking locks) that
1262 * the timeout code does. JRA.
1264 num_echos = smb_echo_count;
1266 process_smb(InBuffer, OutBuffer);
1268 if (smb_echo_count != num_echos) {
1269 if(!timeout_processing( deadtime, &select_timeout, &last_timeout_processing_time))
1271 num_smbs = 0; /* Reset smb counter. */
1277 * If we are getting smb requests in a constant stream
1278 * with no echos, make sure we attempt timeout processing
1279 * every select_timeout milliseconds - but only check for this
1280 * every 200 smb requests.
1283 if ((num_smbs % 200) == 0) {
1284 time_t new_check_time = time(NULL);
1285 if(new_check_time - last_timeout_processing_time >= (select_timeout/1000)) {
1286 if(!timeout_processing( deadtime, &select_timeout, &last_timeout_processing_time))
1288 num_smbs = 0; /* Reset smb counter. */
1289 last_timeout_processing_time = new_check_time; /* Reset time. */