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), "/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 to be run as the connected user? */
697 if ((flags & AS_USER) && !become_user(conn,session_tag)) {
698 if (flags & AS_GUEST)
701 return(ERROR(ERRSRV,ERRaccess));
704 /* this code is to work around a bug is MS client 3 without
705 introducing a security hole - it needs to be able to do
706 print queue checks as guest if it isn't logged in properly */
710 /* does it need write permission? */
711 if ((flags & NEED_WRITE) && !CAN_WRITE(conn))
712 return(ERROR(ERRSRV,ERRaccess));
714 /* ipc services are limited */
715 if (IS_IPC(conn) && (flags & AS_USER) && !(flags & CAN_IPC)) {
716 return(ERROR(ERRSRV,ERRaccess));
719 /* load service specific parameters */
720 if (conn && !become_service(conn,(flags & AS_USER)?True:False)) {
721 return(ERROR(ERRSRV,ERRaccess));
724 /* does this protocol need to be run as guest? */
725 if ((flags & AS_GUEST) &&
727 !check_access(smbd_server_fd(), lp_hostsallow(-1), lp_hostsdeny(-1)))) {
728 return(ERROR(ERRSRV,ERRaccess));
733 outsize = smb_messages[type].fn(conn, inbuf,outbuf,size,bufsize);
736 smb_dump(smb_fn_name(type), 0, outbuf, outsize);
742 /****************************************************************************
743 construct a reply to the incoming packet
744 ****************************************************************************/
745 static int construct_reply(char *inbuf,char *outbuf,int size,int bufsize)
747 int type = CVAL(inbuf,smb_com);
749 int msg_type = CVAL(inbuf,0);
751 GetTimeOfDay(&smb_last_time);
758 return(reply_special(inbuf,outbuf));
760 construct_reply_common(inbuf, outbuf);
762 outsize = switch_message(type,inbuf,outbuf,size,bufsize);
764 outsize += chain_size;
767 smb_setlen(outbuf,outsize - 4);
771 /****************************************************************************
772 Keep track of the number of running smbd's. This functionality is used to
773 'hard' limit Samba overhead on resource constrained systems.
774 ****************************************************************************/
775 static BOOL smbd_process_limit(void)
779 if (lp_max_smbd_processes()) {
781 /* Always add one to the smbd process count, as exit_server() always
784 tdb_lock_bystring(conn_tdb_ctx(), "INFO/total_smbds");
785 total_smbds = tdb_fetch_int(conn_tdb_ctx(), "INFO/total_smbds");
786 total_smbds = total_smbds < 0 ? 1 : total_smbds + 1;
787 tdb_store_int(conn_tdb_ctx(), "INFO/total_smbds", total_smbds);
788 tdb_unlock_bystring(conn_tdb_ctx(), "INFO/total_smbds");
790 return total_smbds > lp_max_smbd_processes();
796 /****************************************************************************
797 process an smb from the client - split out from the process() code so
798 it can be used by the oplock break code.
799 ****************************************************************************/
800 void process_smb(char *inbuf, char *outbuf)
803 extern BOOL sslEnabled; /* don't use function for performance reasons */
804 static int sslConnected = 0;
805 #endif /* WITH_SSL */
806 static int trans_num;
807 int msg_type = CVAL(inbuf,0);
808 int32 len = smb_len(inbuf);
811 DO_PROFILE_INC(smb_count);
813 if (trans_num == 0) {
814 /* on the first packet, check the global hosts allow/ hosts
815 deny parameters before doing any parsing of the packet
816 passed to us by the client. This prevents attacks on our
817 parsing code from hosts not in the hosts allow list */
818 if (smbd_process_limit() ||
819 !check_access(smbd_server_fd(), lp_hostsallow(-1), lp_hostsdeny(-1))) {
820 /* send a negative session response "not listening on calling
822 static unsigned char buf[5] = {0x83, 0, 0, 1, 0x81};
823 DEBUG( 1, ( "Connection denied from %s\n",
825 send_smb(smbd_server_fd(),(char *)buf);
826 exit_server("connection denied");
830 DEBUG( 6, ( "got message type 0x%x of len 0x%x\n", msg_type, len ) );
831 DEBUG( 3, ( "Transaction %d of length %d\n", trans_num, nread ) );
834 if(sslEnabled && !sslConnected){
835 sslConnected = sslutil_negotiate_ssl(smbd_server_fd(), msg_type);
836 if(sslConnected < 0){ /* an error occured */
837 exit_server("SSL negotiation failed");
838 }else if(sslConnected){
843 #endif /* WITH_SSL */
847 else if(msg_type == 0x85)
848 return; /* Keepalive packet. */
850 nread = construct_reply(inbuf,outbuf,nread,max_send);
854 if (CVAL(outbuf,0) == 0)
857 if (nread != smb_len(outbuf) + 4)
859 DEBUG(0,("ERROR: Invalid message response size! %d %d\n",
860 nread, smb_len(outbuf)));
863 send_smb(smbd_server_fd(),outbuf);
870 /****************************************************************************
871 return a string containing the function name of a SMB command
872 ****************************************************************************/
873 char *smb_fn_name(int type)
875 static char *unknown_name = "SMBunknown";
877 if (smb_messages[type].name == NULL)
878 return(unknown_name);
880 return(smb_messages[type].name);
884 /****************************************************************************
885 Helper function for contruct_reply.
886 ****************************************************************************/
888 void construct_reply_common(char *inbuf,char *outbuf)
890 memset(outbuf,'\0',smb_size);
892 set_message(outbuf,0,0,True);
893 CVAL(outbuf,smb_com) = CVAL(inbuf,smb_com);
895 memcpy(outbuf+4,inbuf+4,4);
896 CVAL(outbuf,smb_rcls) = SMB_SUCCESS;
897 CVAL(outbuf,smb_reh) = 0;
898 SCVAL(outbuf,smb_flg, FLAG_REPLY | (CVAL(inbuf,smb_flg) & FLAG_CASELESS_PATHNAMES)); /* bit 7 set
900 SSVAL(outbuf,smb_flg2,
901 (SVAL(inbuf,smb_flg2)&FLAGS2_UNICODE_STRINGS) | FLAGS2_LONG_PATH_COMPONENTS);
902 /* say we support long filenames */
904 SSVAL(outbuf,smb_err,SMB_SUCCESS);
905 SSVAL(outbuf,smb_tid,SVAL(inbuf,smb_tid));
906 SSVAL(outbuf,smb_pid,SVAL(inbuf,smb_pid));
907 SSVAL(outbuf,smb_uid,SVAL(inbuf,smb_uid));
908 SSVAL(outbuf,smb_mid,SVAL(inbuf,smb_mid));
911 /****************************************************************************
912 construct a chained reply and add it to the already made reply
913 **************************************************************************/
914 int chain_reply(char *inbuf,char *outbuf,int size,int bufsize)
916 static char *orig_inbuf;
917 static char *orig_outbuf;
918 int smb_com1, smb_com2 = CVAL(inbuf,smb_vwv0);
919 unsigned smb_off2 = SVAL(inbuf,smb_vwv1);
920 char *inbuf2, *outbuf2;
922 char inbuf_saved[smb_wct];
923 char outbuf_saved[smb_wct];
924 int wct = CVAL(outbuf,smb_wct);
925 int outsize = smb_size + 2*wct + SVAL(outbuf,smb_vwv0+2*wct);
927 /* maybe its not chained */
928 if (smb_com2 == 0xFF) {
929 CVAL(outbuf,smb_vwv0) = 0xFF;
933 if (chain_size == 0) {
934 /* this is the first part of the chain */
936 orig_outbuf = outbuf;
940 * The original Win95 redirector dies on a reply to
941 * a lockingX and read chain unless the chain reply is
942 * 4 byte aligned. JRA.
945 outsize = (outsize + 3) & ~3;
947 /* we need to tell the client where the next part of the reply will be */
948 SSVAL(outbuf,smb_vwv1,smb_offset(outbuf+outsize,outbuf));
949 CVAL(outbuf,smb_vwv0) = smb_com2;
951 /* remember how much the caller added to the chain, only counting stuff
952 after the parameter words */
953 chain_size += outsize - smb_wct;
955 /* work out pointers into the original packets. The
956 headers on these need to be filled in */
957 inbuf2 = orig_inbuf + smb_off2 + 4 - smb_wct;
958 outbuf2 = orig_outbuf + SVAL(outbuf,smb_vwv1) + 4 - smb_wct;
960 /* remember the original command type */
961 smb_com1 = CVAL(orig_inbuf,smb_com);
963 /* save the data which will be overwritten by the new headers */
964 memcpy(inbuf_saved,inbuf2,smb_wct);
965 memcpy(outbuf_saved,outbuf2,smb_wct);
967 /* give the new packet the same header as the last part of the SMB */
968 memmove(inbuf2,inbuf,smb_wct);
970 /* create the in buffer */
971 CVAL(inbuf2,smb_com) = smb_com2;
973 /* create the out buffer */
974 construct_reply_common(inbuf2, outbuf2);
976 DEBUG(3,("Chained message\n"));
979 /* process the request */
980 outsize2 = switch_message(smb_com2,inbuf2,outbuf2,size-chain_size,
983 /* copy the new reply and request headers over the old ones, but
984 preserve the smb_com field */
985 memmove(orig_outbuf,outbuf2,smb_wct);
986 CVAL(orig_outbuf,smb_com) = smb_com1;
988 /* restore the saved data, being careful not to overwrite any
989 data from the reply header */
990 memcpy(inbuf2,inbuf_saved,smb_wct);
992 int ofs = smb_wct - PTR_DIFF(outbuf2,orig_outbuf);
993 if (ofs < 0) ofs = 0;
994 memmove(outbuf2+ofs,outbuf_saved+ofs,smb_wct-ofs);
1000 /****************************************************************************
1001 Setup the needed select timeout.
1002 ****************************************************************************/
1004 static int setup_select_timeout(void)
1010 * Increase the select timeout back to SMBD_SELECT_TIMEOUT if we
1011 * have removed any blocking locks. JRA.
1014 select_timeout = blocking_locks_pending() ? SMBD_SELECT_TIMEOUT_WITH_PENDING_LOCKS*1000 :
1015 SMBD_SELECT_TIMEOUT*1000;
1017 t = change_notify_timeout();
1018 if (t != -1) select_timeout = MIN(select_timeout, t*1000);
1020 return select_timeout;
1023 /****************************************************************************
1024 Check if services need reloading.
1025 ****************************************************************************/
1027 void check_reload(int t)
1029 static time_t last_smb_conf_reload_time = 0;
1031 if(last_smb_conf_reload_time == 0)
1032 last_smb_conf_reload_time = t;
1034 if (reload_after_sighup || (t >= last_smb_conf_reload_time+SMBD_RELOAD_CHECK))
1036 reload_services(True);
1037 reload_after_sighup = False;
1038 last_smb_conf_reload_time = t;
1042 /****************************************************************************
1043 Process any timeout housekeeping. Return False if the caller should exit.
1044 ****************************************************************************/
1046 static BOOL timeout_processing(int deadtime, int *select_timeout, time_t *last_timeout_processing_time)
1048 static time_t last_keepalive_sent_time = 0;
1049 static time_t last_idle_closed_check = 0;
1051 BOOL allidle = True;
1052 extern int keepalive;
1054 if (smb_read_error == READ_EOF)
1056 DEBUG(3,("end of file from client\n"));
1060 if (smb_read_error == READ_ERROR)
1062 DEBUG(3,("receive_smb error (%s) exiting\n",
1067 *last_timeout_processing_time = t = time(NULL);
1069 if(last_keepalive_sent_time == 0)
1070 last_keepalive_sent_time = t;
1072 if(last_idle_closed_check == 0)
1073 last_idle_closed_check = t;
1075 /* become root again if waiting */
1078 /* check if we need to reload services */
1081 /* automatic timeout if all connections are closed */
1082 if (conn_num_open()==0 && (t - last_idle_closed_check) >= IDLE_CLOSED_TIMEOUT)
1084 DEBUG( 2, ( "Closing idle connection\n" ) );
1088 last_idle_closed_check = t;
1090 if (keepalive && (t - last_keepalive_sent_time)>keepalive)
1092 struct cli_state *cli = server_client();
1093 if (!send_keepalive(smbd_server_fd())) {
1094 DEBUG( 2, ( "Keepalive failed - exiting.\n" ) );
1097 /* also send a keepalive to the password server if its still
1099 if (cli && cli->initialised)
1100 send_keepalive(cli->fd);
1101 last_keepalive_sent_time = t;
1104 /* check for connection timeouts */
1105 allidle = conn_idle_all(t, deadtime);
1107 if (allidle && conn_num_open()>0) {
1108 DEBUG(2,("Closing idle connection 2.\n"));
1112 if(global_machine_password_needs_changing)
1114 unsigned char trust_passwd_hash[16];
1116 pstring remote_machine_list;
1119 * We're in domain level security, and the code that
1120 * read the machine password flagged that the machine
1121 * password needs changing.
1125 * First, open the machine password file with an exclusive lock.
1128 if(!secrets_fetch_trust_account_password(global_myworkgroup, trust_passwd_hash, &lct)) {
1129 DEBUG(0,("process: unable to read the machine account password for \
1130 machine %s in domain %s.\n", global_myname, global_myworkgroup ));
1135 * Make sure someone else hasn't already done this.
1138 if(t < lct + lp_machine_password_timeout()) {
1139 global_machine_password_needs_changing = False;
1143 pstrcpy(remote_machine_list, lp_passwordserver());
1145 change_trust_account_password( global_myworkgroup, remote_machine_list);
1146 global_machine_password_needs_changing = False;
1150 * Check to see if we have any blocking locks
1151 * outstanding on the queue.
1153 process_blocking_lock_queue(t);
1156 * Check to see if we have any change notifies
1157 * outstanding on the queue.
1159 process_pending_change_notify_queue(t);
1162 * Now we are root, check if the log files need pruning.
1164 if(need_to_check_log_size())
1168 * Modify the select timeout depending upon
1169 * what we have remaining in our queues.
1172 *select_timeout = setup_select_timeout();
1177 /****************************************************************************
1178 process commands from the client
1179 ****************************************************************************/
1181 void smbd_process(void)
1183 extern int smb_echo_count;
1184 time_t last_timeout_processing_time = time(NULL);
1185 unsigned int num_smbs = 0;
1187 InBuffer = (char *)malloc(BUFFER_SIZE + SAFETY_MARGIN);
1188 OutBuffer = (char *)malloc(BUFFER_SIZE + SAFETY_MARGIN);
1189 if ((InBuffer == NULL) || (OutBuffer == NULL))
1192 max_recv = MIN(lp_maxxmit(),BUFFER_SIZE);
1194 /* re-initialise the timezone */
1198 int deadtime = lp_deadtime()*60;
1199 int select_timeout = setup_select_timeout();
1203 deadtime = DEFAULT_SMBD_TIMEOUT;
1207 /* free up temporary memory */
1209 main_loop_talloc_free();
1211 while (!receive_message_or_smb(InBuffer,BUFFER_SIZE,select_timeout)) {
1212 if(!timeout_processing( deadtime, &select_timeout, &last_timeout_processing_time))
1214 num_smbs = 0; /* Reset smb counter. */
1218 * Ensure we do timeout processing if the SMB we just got was
1219 * only an echo request. This allows us to set the select
1220 * timeout in 'receive_message_or_smb()' to any value we like
1221 * without worrying that the client will send echo requests
1222 * faster than the select timeout, thus starving out the
1223 * essential processing (change notify, blocking locks) that
1224 * the timeout code does. JRA.
1226 num_echos = smb_echo_count;
1228 process_smb(InBuffer, OutBuffer);
1230 if (smb_echo_count != num_echos) {
1231 if(!timeout_processing( deadtime, &select_timeout, &last_timeout_processing_time))
1233 num_smbs = 0; /* Reset smb counter. */
1239 * If we are getting smb requests in a constant stream
1240 * with no echos, make sure we attempt timeout processing
1241 * every select_timeout milliseconds - but only check for this
1242 * every 200 smb requests.
1245 if ((num_smbs % 200) == 0) {
1246 time_t new_check_time = time(NULL);
1247 if(last_timeout_processing_time - new_check_time >= (select_timeout/1000)) {
1248 if(!timeout_processing( deadtime, &select_timeout, &last_timeout_processing_time))
1250 num_smbs = 0; /* Reset smb counter. */
1251 last_timeout_processing_time = new_check_time; /* Reset time. */