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 char *last_inbuf;
46 extern char *InBuffer;
47 extern char *OutBuffer;
48 extern int smb_read_error;
49 extern VOLATILE sig_atomic_t reload_after_sighup;
50 extern BOOL global_machine_password_needs_changing;
51 extern fstring global_myworkgroup;
52 extern pstring global_myname;
55 /****************************************************************************
56 structure to hold a linked list of queued messages.
58 ****************************************************************************/
64 } pending_message_list;
66 static ubi_slList smb_oplock_queue = { NULL, (ubi_slNodePtr)&smb_oplock_queue, 0};
68 /****************************************************************************
69 Function to push a message onto the tail of a linked list of smb messages ready
71 ****************************************************************************/
73 static BOOL push_message(ubi_slList *list_head, char *buf, int msg_len)
75 pending_message_list *msg = (pending_message_list *)
76 malloc(sizeof(pending_message_list));
80 DEBUG(0,("push_message: malloc fail (1)\n"));
84 msg->msg_buf = (char *)malloc(msg_len);
85 if(msg->msg_buf == NULL)
87 DEBUG(0,("push_message: malloc fail (2)\n"));
92 memcpy(msg->msg_buf, buf, msg_len);
93 msg->msg_len = msg_len;
95 ubi_slAddTail( list_head, msg);
100 /****************************************************************************
101 Function to push a smb message onto a linked list of local smb messages ready
103 ****************************************************************************/
105 BOOL push_oplock_pending_smb_message(char *buf, int msg_len)
107 return push_message(&smb_oplock_queue, buf, msg_len);
110 /****************************************************************************
111 do all async processing in here. This includes UDB oplock messages, kernel
112 oplock messages, change notify events etc.
113 ****************************************************************************/
114 static void async_processing(fd_set *fds, char *buffer, int buffer_len)
116 /* check for oplock messages (both UDP and kernel) */
117 if (receive_local_message(fds, buffer, buffer_len, 0)) {
118 process_local_message(buffer, buffer_len);
121 /* check for async change notify events */
122 process_pending_change_notify_queue(0);
124 /* check for sighup processing */
125 if (reload_after_sighup) {
127 DEBUG(1,("Reloading services after SIGHUP\n"));
128 reload_services(False);
129 reload_after_sighup = False;
133 /****************************************************************************
134 Do a select on an two fd's - with timeout.
136 If a local udp message has been pushed onto the
137 queue (this can only happen during oplock break
138 processing) call async_processing()
140 If a pending smb message has been pushed onto the
141 queue (this can only happen during oplock break
142 processing) return this next.
144 If the first smbfd is ready then read an smb from it.
145 if the second (loopback UDP) fd is ready then read a message
146 from it and setup the buffer header to identify the length
148 Returns False on timeout or error.
151 The timeout is in milli seconds
152 ****************************************************************************/
154 static BOOL receive_message_or_smb(char *buffer, int buffer_len, int timeout)
166 * Note that this call must be before processing any SMB
167 * messages as we need to synchronously process any messages
168 * we may have sent to ourselves from the previous SMB.
173 * Check to see if we already have a message on the smb queue.
174 * If so - copy and return it.
176 if(ubi_slCount(&smb_oplock_queue) != 0) {
177 pending_message_list *msg = (pending_message_list *)ubi_slRemHead(&smb_oplock_queue);
178 memcpy(buffer, msg->msg_buf, MIN(buffer_len, msg->msg_len));
180 /* Free the message we just copied. */
181 SAFE_FREE(msg->msg_buf);
184 DEBUG(5,("receive_message_or_smb: returning queued smb message.\n"));
190 * Setup the select read fd set.
194 FD_SET(smbd_server_fd(),&fds);
195 maxfd = setup_oplock_select_set(&fds);
197 to.tv_sec = timeout / 1000;
198 to.tv_usec = (timeout % 1000) * 1000;
200 selrtn = sys_select(MAX(maxfd,smbd_server_fd())+1,&fds,timeout>0?&to:NULL);
202 /* if we get EINTR then maybe we have received an oplock
203 signal - treat this as select returning 1. This is ugly, but
204 is the best we can do until the oplock code knows more about
206 if (selrtn == -1 && errno == EINTR) {
207 async_processing(&fds, buffer, buffer_len);
209 * After async processing we must go and do the select again, as
210 * the state of the flag in fds for the server file descriptor is
211 * indeterminate - we may have done I/O on it in the oplock processing. JRA.
218 /* something is wrong. Maybe the socket is dead? */
219 smb_read_error = READ_ERROR;
223 /* Did we timeout ? */
225 smb_read_error = READ_TIMEOUT;
230 * Ensure we process oplock break messages by preference.
231 * This is IMPORTANT ! Otherwise we can starve other processes
232 * sending us an oplock break message. JRA.
235 if (oplock_message_waiting(&fds)) {
236 async_processing(&fds, buffer, buffer_len);
238 * After async processing we must go and do the select again, as
239 * the state of the flag in fds for the server file descriptor is
240 * indeterminate - we may have done I/O on it in the oplock processing. JRA.
245 return receive_smb(smbd_server_fd(), buffer, 0);
248 /****************************************************************************
249 Get the next SMB packet, doing the local message processing automatically.
250 ****************************************************************************/
252 BOOL receive_next_smb(char *inbuf, int bufsize, int timeout)
258 ret = receive_message_or_smb(inbuf,bufsize,timeout);
260 got_keepalive = (ret && (CVAL(inbuf,0) == 0x85));
261 } while (ret && got_keepalive);
266 /****************************************************************************
267 We're terminating and have closed all our files/connections etc.
268 If there are any pending local messages we need to respond to them
269 before termination so that other smbds don't think we just died whilst
271 ****************************************************************************/
273 void respond_to_all_remaining_local_messages(void)
279 * Assert we have no exclusive open oplocks.
282 if(get_number_of_exclusive_open_oplocks()) {
283 DEBUG(0,("respond_to_all_remaining_local_messages: PANIC : we have %d exclusive oplocks.\n",
284 get_number_of_exclusive_open_oplocks() ));
289 * Setup the select read fd set.
293 if(!setup_oplock_select_set(&fds))
297 * Keep doing receive_local_message with a 1 ms timeout until
298 * we have no more messages.
300 while(receive_local_message(&fds, buffer, sizeof(buffer), 1)) {
301 /* Deal with oplock break requests from other smbd's. */
302 process_local_message(buffer, sizeof(buffer));
305 (void)setup_oplock_select_set(&fds);
313 These flags determine some of the permissions required to do an operation
315 Note that I don't set NEED_WRITE on some write operations because they
316 are used by some brain-dead clients when printing, and I don't want to
317 force write permissions on print services.
319 #define AS_USER (1<<0)
320 #define NEED_WRITE (1<<1)
321 #define TIME_INIT (1<<2)
322 #define CAN_IPC (1<<3)
323 #define AS_GUEST (1<<5)
324 #define QUEUE_IN_OPLOCK (1<<6)
327 define a list of possible SMB messages and their corresponding
328 functions. Any message that has a NULL function is unimplemented -
329 please feel free to contribute implementations!
331 struct smb_message_struct
334 int (*fn)(connection_struct *conn, char *, char *, int, int);
337 smb_messages[256] = {
339 /* 0x00 */ { "SMBmkdir",reply_mkdir,AS_USER | NEED_WRITE},
340 /* 0x01 */ { "SMBrmdir",reply_rmdir,AS_USER | NEED_WRITE},
341 /* 0x02 */ { "SMBopen",reply_open,AS_USER | QUEUE_IN_OPLOCK },
342 /* 0x03 */ { "SMBcreate",reply_mknew,AS_USER},
343 /* 0x04 */ { "SMBclose",reply_close,AS_USER | CAN_IPC },
344 /* 0x05 */ { "SMBflush",reply_flush,AS_USER},
345 /* 0x06 */ { "SMBunlink",reply_unlink,AS_USER | NEED_WRITE | QUEUE_IN_OPLOCK},
346 /* 0x07 */ { "SMBmv",reply_mv,AS_USER | NEED_WRITE | QUEUE_IN_OPLOCK},
347 /* 0x08 */ { "SMBgetatr",reply_getatr,AS_USER},
348 /* 0x09 */ { "SMBsetatr",reply_setatr,AS_USER | NEED_WRITE},
349 /* 0x0a */ { "SMBread",reply_read,AS_USER},
350 /* 0x0b */ { "SMBwrite",reply_write,AS_USER | CAN_IPC },
351 /* 0x0c */ { "SMBlock",reply_lock,AS_USER},
352 /* 0x0d */ { "SMBunlock",reply_unlock,AS_USER},
353 /* 0x0e */ { "SMBctemp",reply_ctemp,AS_USER | QUEUE_IN_OPLOCK },
354 /* 0x0f */ { "SMBmknew",reply_mknew,AS_USER},
355 /* 0x10 */ { "SMBchkpth",reply_chkpth,AS_USER},
356 /* 0x11 */ { "SMBexit",reply_exit,0},
357 /* 0x12 */ { "SMBlseek",reply_lseek,AS_USER},
358 /* 0x13 */ { "SMBlockread",reply_lockread,AS_USER},
359 /* 0x14 */ { "SMBwriteunlock",reply_writeunlock,AS_USER},
360 /* 0x15 */ { NULL, NULL, 0 },
361 /* 0x16 */ { NULL, NULL, 0 },
362 /* 0x17 */ { NULL, NULL, 0 },
363 /* 0x18 */ { NULL, NULL, 0 },
364 /* 0x19 */ { NULL, NULL, 0 },
365 /* 0x1a */ { "SMBreadbraw",reply_readbraw,AS_USER},
366 /* 0x1b */ { "SMBreadBmpx",reply_readbmpx,AS_USER},
367 /* 0x1c */ { "SMBreadBs",NULL,AS_USER},
368 /* 0x1d */ { "SMBwritebraw",reply_writebraw,AS_USER},
369 /* 0x1e */ { NULL,NULL,0},
370 /* 0x1f */ { NULL,NULL,0},
371 /* 0x20 */ { NULL,NULL,0},
372 /* 0x21 */ { NULL, NULL, 0 },
373 /* 0x22 */ { "SMBsetattrE",reply_setattrE,AS_USER | NEED_WRITE },
374 /* 0x23 */ { "SMBgetattrE",reply_getattrE,AS_USER },
375 /* 0x24 */ { "SMBlockingX",reply_lockingX,AS_USER },
376 /* 0x25 */ { "SMBtrans",reply_trans,AS_USER | CAN_IPC | QUEUE_IN_OPLOCK},
377 /* 0x26 */ { "SMBtranss",NULL,AS_USER | CAN_IPC},
378 /* 0x27 */ { "SMBioctl",reply_ioctl,0},
379 /* 0x28 */ { "SMBioctls",NULL,AS_USER},
380 /* 0x29 */ { "SMBcopy",reply_copy,AS_USER | NEED_WRITE | QUEUE_IN_OPLOCK },
381 /* 0x2a */ { "SMBmove",NULL,AS_USER | NEED_WRITE | QUEUE_IN_OPLOCK },
382 /* 0x2b */ { "SMBecho",reply_echo,0},
383 /* 0x2c */ { "SMBwriteclose",reply_writeclose,AS_USER},
384 /* 0x2d */ { "SMBopenX",reply_open_and_X,AS_USER | CAN_IPC | QUEUE_IN_OPLOCK },
385 /* 0x2e */ { "SMBreadX",reply_read_and_X,AS_USER | CAN_IPC },
386 /* 0x2f */ { "SMBwriteX",reply_write_and_X,AS_USER | CAN_IPC },
387 /* 0x30 */ { NULL, NULL, 0 },
388 /* 0x31 */ { NULL, NULL, 0 },
389 /* 0x32 */ { "SMBtrans2", reply_trans2, AS_USER | QUEUE_IN_OPLOCK | CAN_IPC },
390 /* 0x33 */ { "SMBtranss2", reply_transs2, AS_USER},
391 /* 0x34 */ { "SMBfindclose", reply_findclose,AS_USER},
392 /* 0x35 */ { "SMBfindnclose", reply_findnclose, AS_USER},
393 /* 0x36 */ { NULL, NULL, 0 },
394 /* 0x37 */ { NULL, NULL, 0 },
395 /* 0x38 */ { NULL, NULL, 0 },
396 /* 0x39 */ { NULL, NULL, 0 },
397 /* 0x3a */ { NULL, NULL, 0 },
398 /* 0x3b */ { NULL, NULL, 0 },
399 /* 0x3c */ { NULL, NULL, 0 },
400 /* 0x3d */ { NULL, NULL, 0 },
401 /* 0x3e */ { NULL, NULL, 0 },
402 /* 0x3f */ { NULL, NULL, 0 },
403 /* 0x40 */ { NULL, NULL, 0 },
404 /* 0x41 */ { NULL, NULL, 0 },
405 /* 0x42 */ { NULL, NULL, 0 },
406 /* 0x43 */ { NULL, NULL, 0 },
407 /* 0x44 */ { NULL, NULL, 0 },
408 /* 0x45 */ { NULL, NULL, 0 },
409 /* 0x46 */ { NULL, NULL, 0 },
410 /* 0x47 */ { NULL, NULL, 0 },
411 /* 0x48 */ { NULL, NULL, 0 },
412 /* 0x49 */ { NULL, NULL, 0 },
413 /* 0x4a */ { NULL, NULL, 0 },
414 /* 0x4b */ { NULL, NULL, 0 },
415 /* 0x4c */ { NULL, NULL, 0 },
416 /* 0x4d */ { NULL, NULL, 0 },
417 /* 0x4e */ { NULL, NULL, 0 },
418 /* 0x4f */ { NULL, NULL, 0 },
419 /* 0x50 */ { NULL, NULL, 0 },
420 /* 0x51 */ { NULL, NULL, 0 },
421 /* 0x52 */ { NULL, NULL, 0 },
422 /* 0x53 */ { NULL, NULL, 0 },
423 /* 0x54 */ { NULL, NULL, 0 },
424 /* 0x55 */ { NULL, NULL, 0 },
425 /* 0x56 */ { NULL, NULL, 0 },
426 /* 0x57 */ { NULL, NULL, 0 },
427 /* 0x58 */ { NULL, NULL, 0 },
428 /* 0x59 */ { NULL, NULL, 0 },
429 /* 0x5a */ { NULL, NULL, 0 },
430 /* 0x5b */ { NULL, NULL, 0 },
431 /* 0x5c */ { NULL, NULL, 0 },
432 /* 0x5d */ { NULL, NULL, 0 },
433 /* 0x5e */ { NULL, NULL, 0 },
434 /* 0x5f */ { NULL, NULL, 0 },
435 /* 0x60 */ { NULL, NULL, 0 },
436 /* 0x61 */ { NULL, NULL, 0 },
437 /* 0x62 */ { NULL, NULL, 0 },
438 /* 0x63 */ { NULL, NULL, 0 },
439 /* 0x64 */ { NULL, NULL, 0 },
440 /* 0x65 */ { NULL, NULL, 0 },
441 /* 0x66 */ { NULL, NULL, 0 },
442 /* 0x67 */ { NULL, NULL, 0 },
443 /* 0x68 */ { NULL, NULL, 0 },
444 /* 0x69 */ { NULL, NULL, 0 },
445 /* 0x6a */ { NULL, NULL, 0 },
446 /* 0x6b */ { NULL, NULL, 0 },
447 /* 0x6c */ { NULL, NULL, 0 },
448 /* 0x6d */ { NULL, NULL, 0 },
449 /* 0x6e */ { NULL, NULL, 0 },
450 /* 0x6f */ { NULL, NULL, 0 },
451 /* 0x70 */ { "SMBtcon",reply_tcon,0},
452 /* 0x71 */ { "SMBtdis",reply_tdis,0},
453 /* 0x72 */ { "SMBnegprot",reply_negprot,0},
454 /* 0x73 */ { "SMBsesssetupX",reply_sesssetup_and_X,0},
455 /* 0x74 */ { "SMBulogoffX", reply_ulogoffX, 0}, /* ulogoff doesn't give a valid TID */
456 /* 0x75 */ { "SMBtconX",reply_tcon_and_X,0},
457 /* 0x76 */ { NULL, NULL, 0 },
458 /* 0x77 */ { NULL, NULL, 0 },
459 /* 0x78 */ { NULL, NULL, 0 },
460 /* 0x79 */ { NULL, NULL, 0 },
461 /* 0x7a */ { NULL, NULL, 0 },
462 /* 0x7b */ { NULL, NULL, 0 },
463 /* 0x7c */ { NULL, NULL, 0 },
464 /* 0x7d */ { NULL, NULL, 0 },
465 /* 0x7e */ { NULL, NULL, 0 },
466 /* 0x7f */ { NULL, NULL, 0 },
467 /* 0x80 */ { "SMBdskattr",reply_dskattr,AS_USER},
468 /* 0x81 */ { "SMBsearch",reply_search,AS_USER},
469 /* 0x82 */ { "SMBffirst",reply_search,AS_USER},
470 /* 0x83 */ { "SMBfunique",reply_search,AS_USER},
471 /* 0x84 */ { "SMBfclose",reply_fclose,AS_USER},
472 /* 0x85 */ { NULL, NULL, 0 },
473 /* 0x86 */ { NULL, NULL, 0 },
474 /* 0x87 */ { NULL, NULL, 0 },
475 /* 0x88 */ { NULL, NULL, 0 },
476 /* 0x89 */ { NULL, NULL, 0 },
477 /* 0x8a */ { NULL, NULL, 0 },
478 /* 0x8b */ { NULL, NULL, 0 },
479 /* 0x8c */ { NULL, NULL, 0 },
480 /* 0x8d */ { NULL, NULL, 0 },
481 /* 0x8e */ { NULL, NULL, 0 },
482 /* 0x8f */ { NULL, NULL, 0 },
483 /* 0x90 */ { NULL, NULL, 0 },
484 /* 0x91 */ { NULL, NULL, 0 },
485 /* 0x92 */ { NULL, NULL, 0 },
486 /* 0x93 */ { NULL, NULL, 0 },
487 /* 0x94 */ { NULL, NULL, 0 },
488 /* 0x95 */ { NULL, NULL, 0 },
489 /* 0x96 */ { NULL, NULL, 0 },
490 /* 0x97 */ { NULL, NULL, 0 },
491 /* 0x98 */ { NULL, NULL, 0 },
492 /* 0x99 */ { NULL, NULL, 0 },
493 /* 0x9a */ { NULL, NULL, 0 },
494 /* 0x9b */ { NULL, NULL, 0 },
495 /* 0x9c */ { NULL, NULL, 0 },
496 /* 0x9d */ { NULL, NULL, 0 },
497 /* 0x9e */ { NULL, NULL, 0 },
498 /* 0x9f */ { NULL, NULL, 0 },
499 /* 0xa0 */ { "SMBnttrans", reply_nttrans, AS_USER | CAN_IPC | QUEUE_IN_OPLOCK},
500 /* 0xa1 */ { "SMBnttranss", reply_nttranss, AS_USER | CAN_IPC },
501 /* 0xa2 */ { "SMBntcreateX", reply_ntcreate_and_X, AS_USER | CAN_IPC | QUEUE_IN_OPLOCK },
502 /* 0xa3 */ { NULL, NULL, 0 },
503 /* 0xa4 */ { "SMBntcancel", reply_ntcancel, 0 },
504 /* 0xa5 */ { NULL, NULL, 0 },
505 /* 0xa6 */ { NULL, NULL, 0 },
506 /* 0xa7 */ { NULL, NULL, 0 },
507 /* 0xa8 */ { NULL, NULL, 0 },
508 /* 0xa9 */ { NULL, NULL, 0 },
509 /* 0xaa */ { NULL, NULL, 0 },
510 /* 0xab */ { NULL, NULL, 0 },
511 /* 0xac */ { NULL, NULL, 0 },
512 /* 0xad */ { NULL, NULL, 0 },
513 /* 0xae */ { NULL, NULL, 0 },
514 /* 0xaf */ { NULL, NULL, 0 },
515 /* 0xb0 */ { NULL, NULL, 0 },
516 /* 0xb1 */ { NULL, NULL, 0 },
517 /* 0xb2 */ { NULL, NULL, 0 },
518 /* 0xb3 */ { NULL, NULL, 0 },
519 /* 0xb4 */ { NULL, NULL, 0 },
520 /* 0xb5 */ { NULL, NULL, 0 },
521 /* 0xb6 */ { NULL, NULL, 0 },
522 /* 0xb7 */ { NULL, NULL, 0 },
523 /* 0xb8 */ { NULL, NULL, 0 },
524 /* 0xb9 */ { NULL, NULL, 0 },
525 /* 0xba */ { NULL, NULL, 0 },
526 /* 0xbb */ { NULL, NULL, 0 },
527 /* 0xbc */ { NULL, NULL, 0 },
528 /* 0xbd */ { NULL, NULL, 0 },
529 /* 0xbe */ { NULL, NULL, 0 },
530 /* 0xbf */ { NULL, NULL, 0 },
531 /* 0xc0 */ { "SMBsplopen",reply_printopen,AS_USER | QUEUE_IN_OPLOCK },
532 /* 0xc1 */ { "SMBsplwr",reply_printwrite,AS_USER},
533 /* 0xc2 */ { "SMBsplclose",reply_printclose,AS_USER},
534 /* 0xc3 */ { "SMBsplretq",reply_printqueue,AS_USER},
535 /* 0xc4 */ { NULL, NULL, 0 },
536 /* 0xc5 */ { NULL, NULL, 0 },
537 /* 0xc6 */ { NULL, NULL, 0 },
538 /* 0xc7 */ { NULL, NULL, 0 },
539 /* 0xc8 */ { NULL, NULL, 0 },
540 /* 0xc9 */ { NULL, NULL, 0 },
541 /* 0xca */ { NULL, NULL, 0 },
542 /* 0xcb */ { NULL, NULL, 0 },
543 /* 0xcc */ { NULL, NULL, 0 },
544 /* 0xcd */ { NULL, NULL, 0 },
545 /* 0xce */ { NULL, NULL, 0 },
546 /* 0xcf */ { NULL, NULL, 0 },
547 /* 0xd0 */ { "SMBsends",reply_sends,AS_GUEST},
548 /* 0xd1 */ { "SMBsendb",NULL,AS_GUEST},
549 /* 0xd2 */ { "SMBfwdname",NULL,AS_GUEST},
550 /* 0xd3 */ { "SMBcancelf",NULL,AS_GUEST},
551 /* 0xd4 */ { "SMBgetmac",NULL,AS_GUEST},
552 /* 0xd5 */ { "SMBsendstrt",reply_sendstrt,AS_GUEST},
553 /* 0xd6 */ { "SMBsendend",reply_sendend,AS_GUEST},
554 /* 0xd7 */ { "SMBsendtxt",reply_sendtxt,AS_GUEST},
555 /* 0xd8 */ { NULL, NULL, 0 },
556 /* 0xd9 */ { NULL, NULL, 0 },
557 /* 0xda */ { NULL, NULL, 0 },
558 /* 0xdb */ { NULL, NULL, 0 },
559 /* 0xdc */ { NULL, NULL, 0 },
560 /* 0xdd */ { NULL, NULL, 0 },
561 /* 0xde */ { NULL, NULL, 0 },
562 /* 0xdf */ { NULL, NULL, 0 },
563 /* 0xe0 */ { NULL, NULL, 0 },
564 /* 0xe1 */ { NULL, NULL, 0 },
565 /* 0xe2 */ { NULL, NULL, 0 },
566 /* 0xe3 */ { NULL, NULL, 0 },
567 /* 0xe4 */ { NULL, NULL, 0 },
568 /* 0xe5 */ { NULL, NULL, 0 },
569 /* 0xe6 */ { NULL, NULL, 0 },
570 /* 0xe7 */ { NULL, NULL, 0 },
571 /* 0xe8 */ { NULL, NULL, 0 },
572 /* 0xe9 */ { NULL, NULL, 0 },
573 /* 0xea */ { NULL, NULL, 0 },
574 /* 0xeb */ { NULL, NULL, 0 },
575 /* 0xec */ { NULL, NULL, 0 },
576 /* 0xed */ { NULL, NULL, 0 },
577 /* 0xee */ { NULL, NULL, 0 },
578 /* 0xef */ { NULL, NULL, 0 },
579 /* 0xf0 */ { NULL, NULL, 0 },
580 /* 0xf1 */ { NULL, NULL, 0 },
581 /* 0xf2 */ { NULL, NULL, 0 },
582 /* 0xf3 */ { NULL, NULL, 0 },
583 /* 0xf4 */ { NULL, NULL, 0 },
584 /* 0xf5 */ { NULL, NULL, 0 },
585 /* 0xf6 */ { NULL, NULL, 0 },
586 /* 0xf7 */ { NULL, NULL, 0 },
587 /* 0xf8 */ { NULL, NULL, 0 },
588 /* 0xf9 */ { NULL, NULL, 0 },
589 /* 0xfa */ { NULL, NULL, 0 },
590 /* 0xfb */ { NULL, NULL, 0 },
591 /* 0xfc */ { NULL, NULL, 0 },
592 /* 0xfd */ { NULL, NULL, 0 },
593 /* 0xfe */ { NULL, NULL, 0 },
594 /* 0xff */ { NULL, NULL, 0 }
598 /*******************************************************************
600 ********************************************************************/
601 static void smb_dump(char *name, int type, char *data, ssize_t len)
605 if (DEBUGLEVEL < 50) return;
607 if (len < 4) len = smb_len(data)+4;
608 for (i=1;i<100;i++) {
609 slprintf(fname,sizeof(fname)-1, "/tmp/%s.%d.%s", name, i,
610 type ? "req" : "resp");
611 fd = open(fname, O_WRONLY|O_CREAT|O_EXCL, 0644);
612 if (fd != -1 || errno != EEXIST) break;
615 write(fd, data, len);
617 DEBUG(0,("created %s len %d\n", fname, len));
622 /****************************************************************************
623 do a switch on the message type, and return the response size
624 ****************************************************************************/
625 static int switch_message(int type,char *inbuf,char *outbuf,int size,int bufsize)
627 static pid_t pid= (pid_t)-1;
629 extern uint16 global_smbpid;
633 if (pid == (pid_t)-1)
639 /* make sure this is an SMB packet */
640 if (strncmp(smb_base(inbuf),"\377SMB",4) != 0)
642 DEBUG(2,("Non-SMB packet of length %d\n",smb_len(inbuf)));
646 /* yuck! this is an interim measure before we get rid of our
647 current inbuf/outbuf system */
648 global_smbpid = SVAL(inbuf,smb_pid);
650 if (smb_messages[type].fn == NULL)
652 DEBUG(0,("Unknown message type %d!\n",type));
653 smb_dump("Unknown", 1, inbuf, size);
654 outsize = reply_unknown(inbuf,outbuf);
658 int flags = smb_messages[type].flags;
659 static uint16 last_session_tag = UID_FIELD_INVALID;
660 /* In share mode security we must ignore the vuid. */
661 uint16 session_tag = (lp_security() == SEC_SHARE) ? UID_FIELD_INVALID : SVAL(inbuf,smb_uid);
662 connection_struct *conn = conn_find(SVAL(inbuf,smb_tid));
664 DEBUG(3,("switch message %s (pid %d)\n",smb_fn_name(type),(int)pid));
666 smb_dump(smb_fn_name(type), 1, inbuf, size);
667 if(global_oplock_break)
669 if(flags & QUEUE_IN_OPLOCK)
672 * Queue this message as we are the process of an oplock break.
675 DEBUG( 2, ( "switch_message: queueing message due to being in " ) );
676 DEBUGADD( 2, ( "oplock break state.\n" ) );
678 push_oplock_pending_smb_message( inbuf, size );
683 /* Ensure this value is replaced in the incoming packet. */
684 SSVAL(inbuf,smb_uid,session_tag);
687 * Ensure the correct username is in current_user_info.
688 * This is a really ugly bugfix for problems with
689 * multiple session_setup_and_X's being done and
690 * allowing %U and %G substitutions to work correctly.
691 * There is a reason this code is done here, don't
692 * move it unless you know what you're doing... :-).
696 if (session_tag != last_session_tag) {
697 user_struct *vuser = NULL;
699 last_session_tag = session_tag;
700 if(session_tag != UID_FIELD_INVALID)
701 vuser = get_valid_user_struct(session_tag);
703 current_user_info = vuser->user;
706 /* does this protocol need to be run as root? */
707 if (!(flags & AS_USER))
710 /* does this protocol need a valid tree connection? */
711 if ((flags & AS_USER) && !conn) {
712 return ERROR_DOS(ERRSRV, ERRinvnid);
716 /* does this protocol need to be run as the connected user? */
717 if ((flags & AS_USER) && !become_user(conn,session_tag)) {
718 if (flags & AS_GUEST)
721 return(ERROR_DOS(ERRSRV,ERRaccess));
724 /* this code is to work around a bug is MS client 3 without
725 introducing a security hole - it needs to be able to do
726 print queue checks as guest if it isn't logged in properly */
730 /* does it need write permission? */
731 if ((flags & NEED_WRITE) && !CAN_WRITE(conn))
732 return(ERROR_DOS(ERRSRV,ERRaccess));
734 /* ipc services are limited */
735 if (IS_IPC(conn) && (flags & AS_USER) && !(flags & CAN_IPC)) {
736 return(ERROR_DOS(ERRSRV,ERRaccess));
739 /* load service specific parameters */
740 if (conn && !become_service(conn,(flags & AS_USER)?True:False)) {
741 return(ERROR_DOS(ERRSRV,ERRaccess));
744 /* does this protocol need to be run as guest? */
745 if ((flags & AS_GUEST) &&
747 !check_access(smbd_server_fd(), lp_hostsallow(-1), lp_hostsdeny(-1)))) {
748 return(ERROR_DOS(ERRSRV,ERRaccess));
753 outsize = smb_messages[type].fn(conn, inbuf,outbuf,size,bufsize);
756 smb_dump(smb_fn_name(type), 0, outbuf, outsize);
762 /****************************************************************************
763 construct a reply to the incoming packet
764 ****************************************************************************/
765 static int construct_reply(char *inbuf,char *outbuf,int size,int bufsize)
767 int type = CVAL(inbuf,smb_com);
769 int msg_type = CVAL(inbuf,0);
771 GetTimeOfDay(&smb_last_time);
778 return(reply_special(inbuf,outbuf));
780 construct_reply_common(inbuf, outbuf);
782 outsize = switch_message(type,inbuf,outbuf,size,bufsize);
784 outsize += chain_size;
787 smb_setlen(outbuf,outsize - 4);
791 /****************************************************************************
792 Keep track of the number of running smbd's. This functionality is used to
793 'hard' limit Samba overhead on resource constrained systems.
794 ****************************************************************************/
795 static BOOL smbd_process_limit(void)
799 if (lp_max_smbd_processes()) {
801 /* Always add one to the smbd process count, as exit_server() always
805 total_smbds = 1; /* In case we need to create the entry. */
807 if (tdb_change_int_atomic(conn_tdb_ctx(), "INFO/total_smbds", &total_smbds, 1) == -1)
810 return total_smbds > lp_max_smbd_processes();
816 /****************************************************************************
817 process an smb from the client - split out from the process() code so
818 it can be used by the oplock break code.
819 ****************************************************************************/
820 void process_smb(char *inbuf, char *outbuf)
823 extern BOOL sslEnabled; /* don't use function for performance reasons */
824 static int sslConnected = 0;
825 #endif /* WITH_SSL */
826 static int trans_num;
827 int msg_type = CVAL(inbuf,0);
828 int32 len = smb_len(inbuf);
831 DO_PROFILE_INC(smb_count);
833 if (trans_num == 0) {
834 /* on the first packet, check the global hosts allow/ hosts
835 deny parameters before doing any parsing of the packet
836 passed to us by the client. This prevents attacks on our
837 parsing code from hosts not in the hosts allow list */
838 if (smbd_process_limit() ||
839 !check_access(smbd_server_fd(), lp_hostsallow(-1), lp_hostsdeny(-1))) {
840 /* send a negative session response "not listening on calling
842 static unsigned char buf[5] = {0x83, 0, 0, 1, 0x81};
843 DEBUG( 1, ( "Connection denied from %s\n",
845 (void)send_smb(smbd_server_fd(),(char *)buf);
846 exit_server("connection denied");
850 DEBUG( 6, ( "got message type 0x%x of len 0x%x\n", msg_type, len ) );
851 DEBUG( 3, ( "Transaction %d of length %d\n", trans_num, nread ) );
854 if(sslEnabled && !sslConnected){
855 sslConnected = sslutil_negotiate_ssl(smbd_server_fd(), msg_type);
856 if(sslConnected < 0){ /* an error occured */
857 exit_server("SSL negotiation failed");
858 }else if(sslConnected){
863 #endif /* WITH_SSL */
867 else if(msg_type == 0x85)
868 return; /* Keepalive packet. */
870 nread = construct_reply(inbuf,outbuf,nread,max_send);
874 if (CVAL(outbuf,0) == 0)
877 if (nread != smb_len(outbuf) + 4)
879 DEBUG(0,("ERROR: Invalid message response size! %d %d\n",
880 nread, smb_len(outbuf)));
883 if (!send_smb(smbd_server_fd(),outbuf))
884 exit_server("process_smb: send_smb failed.\n");
891 /****************************************************************************
892 return a string containing the function name of a SMB command
893 ****************************************************************************/
894 char *smb_fn_name(int type)
896 static char *unknown_name = "SMBunknown";
898 if (smb_messages[type].name == NULL)
899 return(unknown_name);
901 return(smb_messages[type].name);
905 /****************************************************************************
906 Helper function for contruct_reply.
907 ****************************************************************************/
909 void construct_reply_common(char *inbuf,char *outbuf)
911 memset(outbuf,'\0',smb_size);
913 set_message(outbuf,0,0,True);
914 CVAL(outbuf,smb_com) = CVAL(inbuf,smb_com);
916 memcpy(outbuf+4,inbuf+4,4);
917 CVAL(outbuf,smb_rcls) = SMB_SUCCESS;
918 CVAL(outbuf,smb_reh) = 0;
919 SCVAL(outbuf,smb_flg, FLAG_REPLY | (CVAL(inbuf,smb_flg) & FLAG_CASELESS_PATHNAMES)); /* bit 7 set
921 SSVAL(outbuf,smb_flg2,
922 (SVAL(inbuf,smb_flg2)&FLAGS2_UNICODE_STRINGS) | FLAGS2_LONG_PATH_COMPONENTS);
923 /* say we support long filenames */
925 SSVAL(outbuf,smb_err,SMB_SUCCESS);
926 SSVAL(outbuf,smb_tid,SVAL(inbuf,smb_tid));
927 SSVAL(outbuf,smb_pid,SVAL(inbuf,smb_pid));
928 SSVAL(outbuf,smb_uid,SVAL(inbuf,smb_uid));
929 SSVAL(outbuf,smb_mid,SVAL(inbuf,smb_mid));
932 /****************************************************************************
933 construct a chained reply and add it to the already made reply
934 **************************************************************************/
935 int chain_reply(char *inbuf,char *outbuf,int size,int bufsize)
937 static char *orig_inbuf;
938 static char *orig_outbuf;
939 int smb_com1, smb_com2 = CVAL(inbuf,smb_vwv0);
940 unsigned smb_off2 = SVAL(inbuf,smb_vwv1);
941 char *inbuf2, *outbuf2;
943 char inbuf_saved[smb_wct];
944 char outbuf_saved[smb_wct];
945 int wct = CVAL(outbuf,smb_wct);
946 int outsize = smb_size + 2*wct + SVAL(outbuf,smb_vwv0+2*wct);
948 /* maybe its not chained */
949 if (smb_com2 == 0xFF) {
950 CVAL(outbuf,smb_vwv0) = 0xFF;
954 if (chain_size == 0) {
955 /* this is the first part of the chain */
957 orig_outbuf = outbuf;
961 * The original Win95 redirector dies on a reply to
962 * a lockingX and read chain unless the chain reply is
963 * 4 byte aligned. JRA.
966 outsize = (outsize + 3) & ~3;
968 /* we need to tell the client where the next part of the reply will be */
969 SSVAL(outbuf,smb_vwv1,smb_offset(outbuf+outsize,outbuf));
970 CVAL(outbuf,smb_vwv0) = smb_com2;
972 /* remember how much the caller added to the chain, only counting stuff
973 after the parameter words */
974 chain_size += outsize - smb_wct;
976 /* work out pointers into the original packets. The
977 headers on these need to be filled in */
978 inbuf2 = orig_inbuf + smb_off2 + 4 - smb_wct;
979 outbuf2 = orig_outbuf + SVAL(outbuf,smb_vwv1) + 4 - smb_wct;
981 /* remember the original command type */
982 smb_com1 = CVAL(orig_inbuf,smb_com);
984 /* save the data which will be overwritten by the new headers */
985 memcpy(inbuf_saved,inbuf2,smb_wct);
986 memcpy(outbuf_saved,outbuf2,smb_wct);
988 /* give the new packet the same header as the last part of the SMB */
989 memmove(inbuf2,inbuf,smb_wct);
991 /* create the in buffer */
992 CVAL(inbuf2,smb_com) = smb_com2;
994 /* create the out buffer */
995 construct_reply_common(inbuf2, outbuf2);
997 DEBUG(3,("Chained message\n"));
1000 /* process the request */
1001 outsize2 = switch_message(smb_com2,inbuf2,outbuf2,size-chain_size,
1002 bufsize-chain_size);
1004 /* copy the new reply and request headers over the old ones, but
1005 preserve the smb_com field */
1006 memmove(orig_outbuf,outbuf2,smb_wct);
1007 CVAL(orig_outbuf,smb_com) = smb_com1;
1009 /* restore the saved data, being careful not to overwrite any
1010 data from the reply header */
1011 memcpy(inbuf2,inbuf_saved,smb_wct);
1013 int ofs = smb_wct - PTR_DIFF(outbuf2,orig_outbuf);
1014 if (ofs < 0) ofs = 0;
1015 memmove(outbuf2+ofs,outbuf_saved+ofs,smb_wct-ofs);
1021 /****************************************************************************
1022 Setup the needed select timeout.
1023 ****************************************************************************/
1025 static int setup_select_timeout(void)
1031 * Increase the select timeout back to SMBD_SELECT_TIMEOUT if we
1032 * have removed any blocking locks. JRA.
1035 select_timeout = blocking_locks_pending() ? SMBD_SELECT_TIMEOUT_WITH_PENDING_LOCKS*1000 :
1036 SMBD_SELECT_TIMEOUT*1000;
1038 t = change_notify_timeout();
1039 if (t != -1) select_timeout = MIN(select_timeout, t*1000);
1041 return select_timeout;
1044 /****************************************************************************
1045 Check if services need reloading.
1046 ****************************************************************************/
1048 void check_reload(int t)
1050 static time_t last_smb_conf_reload_time = 0;
1052 if(last_smb_conf_reload_time == 0)
1053 last_smb_conf_reload_time = t;
1055 if (reload_after_sighup || (t >= last_smb_conf_reload_time+SMBD_RELOAD_CHECK))
1057 reload_services(True);
1058 reload_after_sighup = False;
1059 last_smb_conf_reload_time = t;
1063 /****************************************************************************
1064 Process any timeout housekeeping. Return False if the caller should exit.
1065 ****************************************************************************/
1067 static BOOL timeout_processing(int deadtime, int *select_timeout, time_t *last_timeout_processing_time)
1069 static time_t last_keepalive_sent_time = 0;
1070 static time_t last_idle_closed_check = 0;
1072 BOOL allidle = True;
1073 extern int keepalive;
1075 if (smb_read_error == READ_EOF)
1077 DEBUG(3,("end of file from client\n"));
1081 if (smb_read_error == READ_ERROR)
1083 DEBUG(3,("receive_smb error (%s) exiting\n",
1088 *last_timeout_processing_time = t = time(NULL);
1090 if(last_keepalive_sent_time == 0)
1091 last_keepalive_sent_time = t;
1093 if(last_idle_closed_check == 0)
1094 last_idle_closed_check = t;
1096 /* become root again if waiting */
1099 /* check if we need to reload services */
1102 /* automatic timeout if all connections are closed */
1103 if (conn_num_open()==0 && (t - last_idle_closed_check) >= IDLE_CLOSED_TIMEOUT)
1105 DEBUG( 2, ( "Closing idle connection\n" ) );
1109 last_idle_closed_check = t;
1111 if (keepalive && (t - last_keepalive_sent_time)>keepalive)
1113 struct cli_state *cli = server_client();
1114 if (!send_keepalive(smbd_server_fd())) {
1115 DEBUG( 2, ( "Keepalive failed - exiting.\n" ) );
1118 /* also send a keepalive to the password server if its still
1120 if (cli && cli->initialised)
1121 if (!send_keepalive(cli->fd)) {
1122 DEBUG( 2, ( "password server keepalive failed.\n"));
1125 last_keepalive_sent_time = t;
1128 /* check for connection timeouts */
1129 allidle = conn_idle_all(t, deadtime);
1131 if (allidle && conn_num_open()>0) {
1132 DEBUG(2,("Closing idle connection 2.\n"));
1136 if(global_machine_password_needs_changing)
1138 unsigned char trust_passwd_hash[16];
1140 pstring remote_machine_list;
1143 * We're in domain level security, and the code that
1144 * read the machine password flagged that the machine
1145 * password needs changing.
1149 * First, open the machine password file with an exclusive lock.
1152 if(!secrets_fetch_trust_account_password(global_myworkgroup, trust_passwd_hash, &lct)) {
1153 DEBUG(0,("process: unable to read the machine account password for \
1154 machine %s in domain %s.\n", global_myname, global_myworkgroup ));
1159 * Make sure someone else hasn't already done this.
1162 if(t < lct + lp_machine_password_timeout()) {
1163 global_machine_password_needs_changing = False;
1167 pstrcpy(remote_machine_list, lp_passwordserver());
1169 change_trust_account_password( global_myworkgroup, remote_machine_list);
1170 global_machine_password_needs_changing = False;
1174 * Check to see if we have any blocking locks
1175 * outstanding on the queue.
1177 process_blocking_lock_queue(t);
1180 * Check to see if we have any change notifies
1181 * outstanding on the queue.
1183 process_pending_change_notify_queue(t);
1186 * Now we are root, check if the log files need pruning.
1187 * Force a log file check.
1189 force_check_log_size();
1193 * Modify the select timeout depending upon
1194 * what we have remaining in our queues.
1197 *select_timeout = setup_select_timeout();
1202 /****************************************************************************
1203 process commands from the client
1204 ****************************************************************************/
1206 void smbd_process(void)
1208 extern int smb_echo_count;
1209 time_t last_timeout_processing_time = time(NULL);
1210 unsigned int num_smbs = 0;
1212 InBuffer = (char *)malloc(BUFFER_SIZE + LARGE_WRITEX_HDR_SIZE + SAFETY_MARGIN);
1213 OutBuffer = (char *)malloc(BUFFER_SIZE + LARGE_WRITEX_HDR_SIZE + SAFETY_MARGIN);
1214 if ((InBuffer == NULL) || (OutBuffer == NULL))
1217 max_recv = MIN(lp_maxxmit(),BUFFER_SIZE);
1219 /* re-initialise the timezone */
1222 /* register our message handlers */
1223 message_register(MSG_SMB_FORCE_TDIS, msg_force_tdis);
1226 int deadtime = lp_deadtime()*60;
1227 int select_timeout = setup_select_timeout();
1231 deadtime = DEFAULT_SMBD_TIMEOUT;
1235 /* free up temporary memory */
1237 main_loop_talloc_free();
1239 while (!receive_message_or_smb(InBuffer,BUFFER_SIZE+LARGE_WRITEX_HDR_SIZE,select_timeout)) {
1240 if(!timeout_processing( deadtime, &select_timeout, &last_timeout_processing_time))
1242 num_smbs = 0; /* Reset smb counter. */
1246 * Ensure we do timeout processing if the SMB we just got was
1247 * only an echo request. This allows us to set the select
1248 * timeout in 'receive_message_or_smb()' to any value we like
1249 * without worrying that the client will send echo requests
1250 * faster than the select timeout, thus starving out the
1251 * essential processing (change notify, blocking locks) that
1252 * the timeout code does. JRA.
1254 num_echos = smb_echo_count;
1256 process_smb(InBuffer, OutBuffer);
1258 if (smb_echo_count != num_echos) {
1259 if(!timeout_processing( deadtime, &select_timeout, &last_timeout_processing_time))
1261 num_smbs = 0; /* Reset smb counter. */
1267 * If we are getting smb requests in a constant stream
1268 * with no echos, make sure we attempt timeout processing
1269 * every select_timeout milliseconds - but only check for this
1270 * every 200 smb requests.
1273 if ((num_smbs % 200) == 0) {
1274 time_t new_check_time = time(NULL);
1275 if(new_check_time - last_timeout_processing_time >= (select_timeout/1000)) {
1276 if(!timeout_processing( deadtime, &select_timeout, &last_timeout_processing_time))
1278 num_smbs = 0; /* Reset smb counter. */
1279 last_timeout_processing_time = new_check_time; /* Reset time. */