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sync'ing up for 3.0alpha20 release
[Samba/gbeck.git] / source3 / smbd / process.c
blob0f7cfd0e9cb0e78ba0a19d2f7b228f8c9e1ec09e
1 /*
2 Unix SMB/CIFS implementation.
3 process incoming packets - main loop
4 Copyright (C) Andrew Tridgell 1992-1998
5
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2 of the License, or
9 (at your option) any later version.
10
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
15
16 You should have received a copy of the GNU General Public License
17 along with this program; if not, write to the Free Software
18 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
19 */
20
21 #include "includes.h"
22
23 struct timeval smb_last_time;
24
25 static char *InBuffer = NULL;
26 char *OutBuffer = NULL;
27 char *last_inbuf = NULL;
28
29 /*
30 * Size of data we can send to client. Set
31 * by the client for all protocols above CORE.
32 * Set by us for CORE protocol.
33 */
34 int max_send = BUFFER_SIZE;
35 /*
36 * Size of the data we can receive. Set by us.
37 * Can be modified by the max xmit parameter.
38 */
39 int max_recv = BUFFER_SIZE;
40
41 extern int last_message;
42 extern int global_oplock_break;
43 extern userdom_struct current_user_info;
44 extern int smb_read_error;
45 SIG_ATOMIC_T reload_after_sighup = 0;
46 SIG_ATOMIC_T got_sig_term = 0;
47 extern BOOL global_machine_password_needs_changing;
48 extern fstring global_myworkgroup;
49 extern pstring global_myname;
50 extern int max_send;
51
52 /****************************************************************************
53 structure to hold a linked list of queued messages.
54 for processing.
55 ****************************************************************************/
56
57 typedef struct {
58 ubi_slNode msg_next;
59 char *msg_buf;
60 int msg_len;
61 } pending_message_list;
62
63 static ubi_slList smb_oplock_queue = { NULL, (ubi_slNodePtr)&smb_oplock_queue, 0};
64
65 /****************************************************************************
66 Function to push a message onto the tail of a linked list of smb messages ready
67 for processing.
68 ****************************************************************************/
69
70 static BOOL push_message(ubi_slList *list_head, char *buf, int msg_len)
71 {
72 pending_message_list *msg = (pending_message_list *)
73 malloc(sizeof(pending_message_list));
74
75 if(msg == NULL)
76 {
77 DEBUG(0,("push_message: malloc fail (1)\n"));
78 return False;
79 }
80
81 msg->msg_buf = (char *)malloc(msg_len);
82 if(msg->msg_buf == NULL)
83 {
84 DEBUG(0,("push_message: malloc fail (2)\n"));
85 SAFE_FREE(msg);
86 return False;
87 }
88
89 memcpy(msg->msg_buf, buf, msg_len);
90 msg->msg_len = msg_len;
91
92 ubi_slAddTail( list_head, msg);
93
94 return True;
95 }
96
97 /****************************************************************************
98 Function to push a smb message onto a linked list of local smb messages ready
99 for processing.
100 ****************************************************************************/
101
102 BOOL push_oplock_pending_smb_message(char *buf, int msg_len)
103 {
104 return push_message(&smb_oplock_queue, buf, msg_len);
105 }
106
107 /****************************************************************************
108 Do all async processing in here. This includes UDB oplock messages, kernel
109 oplock messages, change notify events etc.
110 ****************************************************************************/
111
112 static void async_processing(char *buffer, int buffer_len)
113 {
114 DEBUG(10,("async_processing: Doing async processing.\n"));
115
116 /* check for oplock messages (both UDP and kernel) */
117 if (receive_local_message(buffer, buffer_len, 1)) {
118 process_local_message(buffer, buffer_len);
119 }
120
121 if (got_sig_term) {
122 exit_server("Caught TERM signal");
123 }
124
125 /* check for async change notify events */
126 process_pending_change_notify_queue(0);
127
128 /* check for sighup processing */
129 if (reload_after_sighup) {
130 change_to_root_user();
131 DEBUG(1,("Reloading services after SIGHUP\n"));
132 reload_services(False);
133 reload_after_sighup = 0;
134 }
135 }
136
137 /****************************************************************************
138 Do a select on an two fd's - with timeout.
139
140 If a local udp message has been pushed onto the
141 queue (this can only happen during oplock break
142 processing) call async_processing()
143
144 If a pending smb message has been pushed onto the
145 queue (this can only happen during oplock break
146 processing) return this next.
147
148 If the first smbfd is ready then read an smb from it.
149 if the second (loopback UDP) fd is ready then read a message
150 from it and setup the buffer header to identify the length
151 and from address.
152 Returns False on timeout or error.
153 Else returns True.
154
155 The timeout is in milliseconds
156 ****************************************************************************/
157
158 static BOOL receive_message_or_smb(char *buffer, int buffer_len, int timeout)
159 {
160 fd_set fds;
161 int selrtn;
162 struct timeval to;
163 int maxfd;
164
165 smb_read_error = 0;
166
167 again:
168
169 /*
170 * Note that this call must be before processing any SMB
171 * messages as we need to synchronously process any messages
172 * we may have sent to ourselves from the previous SMB.
173 */
174 message_dispatch();
175
176 /*
177 * Check to see if we already have a message on the smb queue.
178 * If so - copy and return it.
179 */
180 if(ubi_slCount(&smb_oplock_queue) != 0) {
181 pending_message_list *msg = (pending_message_list *)ubi_slRemHead(&smb_oplock_queue);
182 memcpy(buffer, msg->msg_buf, MIN(buffer_len, msg->msg_len));
183
184 /* Free the message we just copied. */
185 SAFE_FREE(msg->msg_buf);
186 SAFE_FREE(msg);
187
188 DEBUG(5,("receive_message_or_smb: returning queued smb message.\n"));
189 return True;
190 }
191
192
193 /*
194 * Setup the select read fd set.
195 */
196
197 FD_ZERO(&fds);
198
199 /*
200 * Ensure we process oplock break messages by preference.
201 * We have to do this before the select, after the select
202 * and if the select returns EINTR. This is due to the fact
203 * that the selects called from async_processing can eat an EINTR
204 * caused by a signal (we can't take the break message there).
205 * This is hideously complex - *MUST* be simplified for 3.0 ! JRA.
206 */
207
208 if (oplock_message_waiting(&fds)) {
209 DEBUG(10,("receive_message_or_smb: oplock_message is waiting.\n"));
210 async_processing(buffer, buffer_len);
211 /*
212 * After async processing we must go and do the select again, as
213 * the state of the flag in fds for the server file descriptor is
214 * indeterminate - we may have done I/O on it in the oplock processing. JRA.
215 */
216 goto again;
217 }
218
219 FD_SET(smbd_server_fd(),&fds);
220 maxfd = setup_oplock_select_set(&fds);
221
222 to.tv_sec = timeout / 1000;
223 to.tv_usec = (timeout % 1000) * 1000;
224
225 selrtn = sys_select(MAX(maxfd,smbd_server_fd())+1,&fds,NULL,NULL,timeout>0?&to:NULL);
226
227 /* if we get EINTR then maybe we have received an oplock
228 signal - treat this as select returning 1. This is ugly, but
229 is the best we can do until the oplock code knows more about
230 signals */
231 if (selrtn == -1 && errno == EINTR) {
232 async_processing(buffer, buffer_len);
233 /*
234 * After async processing we must go and do the select again, as
235 * the state of the flag in fds for the server file descriptor is
236 * indeterminate - we may have done I/O on it in the oplock processing. JRA.
237 */
238 goto again;
239 }
240
241 /* Check if error */
242 if (selrtn == -1) {
243 /* something is wrong. Maybe the socket is dead? */
244 smb_read_error = READ_ERROR;
245 return False;
246 }
247
248 /* Did we timeout ? */
249 if (selrtn == 0) {
250 smb_read_error = READ_TIMEOUT;
251 return False;
252 }
253
254 /*
255 * Ensure we process oplock break messages by preference.
256 * This is IMPORTANT ! Otherwise we can starve other processes
257 * sending us an oplock break message. JRA.
258 */
259
260 if (oplock_message_waiting(&fds)) {
261 async_processing(buffer, buffer_len);
262 /*
263 * After async processing we must go and do the select again, as
264 * the state of the flag in fds for the server file descriptor is
265 * indeterminate - we may have done I/O on it in the oplock processing. JRA.
266 */
267 goto again;
268 }
269
270 return receive_smb(smbd_server_fd(), buffer, 0);
271 }
272
273 /****************************************************************************
274 Get the next SMB packet, doing the local message processing automatically.
275 ****************************************************************************/
276
277 BOOL receive_next_smb(char *inbuf, int bufsize, int timeout)
278 {
279 BOOL got_keepalive;
280 BOOL ret;
281
282 do {
283 ret = receive_message_or_smb(inbuf,bufsize,timeout);
284
285 got_keepalive = (ret && (CVAL(inbuf,0) == SMBkeepalive));
286 } while (ret && got_keepalive);
287
288 return ret;
289 }
290
291 /****************************************************************************
292 We're terminating and have closed all our files/connections etc.
293 If there are any pending local messages we need to respond to them
294 before termination so that other smbds don't think we just died whilst
295 holding oplocks.
296 ****************************************************************************/
297
298 void respond_to_all_remaining_local_messages(void)
299 {
300 char buffer[1024];
301
302 /*
303 * Assert we have no exclusive open oplocks.
304 */
305
306 if(get_number_of_exclusive_open_oplocks()) {
307 DEBUG(0,("respond_to_all_remaining_local_messages: PANIC : we have %d exclusive oplocks.\n",
308 get_number_of_exclusive_open_oplocks() ));
309 return;
310 }
311
312 /*
313 * Keep doing receive_local_message with a 1 ms timeout until
314 * we have no more messages.
315 */
316 while(receive_local_message(buffer, sizeof(buffer), 1)) {
317 /* Deal with oplock break requests from other smbd's. */
318 process_local_message(buffer, sizeof(buffer));
319 }
320
321 return;
322 }
323
324
325 /*
326 These flags determine some of the permissions required to do an operation
327
328 Note that I don't set NEED_WRITE on some write operations because they
329 are used by some brain-dead clients when printing, and I don't want to
330 force write permissions on print services.
331 */
332 #define AS_USER (1<<0)
333 #define NEED_WRITE (1<<1)
334 #define TIME_INIT (1<<2)
335 #define CAN_IPC (1<<3)
336 #define AS_GUEST (1<<5)
337 #define QUEUE_IN_OPLOCK (1<<6)
338
339 /*
340 define a list of possible SMB messages and their corresponding
341 functions. Any message that has a NULL function is unimplemented -
342 please feel free to contribute implementations!
343 */
344 const static struct smb_message_struct
345 {
346 const char *name;
347 int (*fn)(connection_struct *conn, char *, char *, int, int);
348 int flags;
349 }
350 smb_messages[256] = {
351
352 /* 0x00 */ { "SMBmkdir",reply_mkdir,AS_USER | NEED_WRITE},
353 /* 0x01 */ { "SMBrmdir",reply_rmdir,AS_USER | NEED_WRITE},
354 /* 0x02 */ { "SMBopen",reply_open,AS_USER | QUEUE_IN_OPLOCK },
355 /* 0x03 */ { "SMBcreate",reply_mknew,AS_USER},
356 /* 0x04 */ { "SMBclose",reply_close,AS_USER | CAN_IPC },
357 /* 0x05 */ { "SMBflush",reply_flush,AS_USER},
358 /* 0x06 */ { "SMBunlink",reply_unlink,AS_USER | NEED_WRITE | QUEUE_IN_OPLOCK},
359 /* 0x07 */ { "SMBmv",reply_mv,AS_USER | NEED_WRITE | QUEUE_IN_OPLOCK},
360 /* 0x08 */ { "SMBgetatr",reply_getatr,AS_USER},
361 /* 0x09 */ { "SMBsetatr",reply_setatr,AS_USER | NEED_WRITE},
362 /* 0x0a */ { "SMBread",reply_read,AS_USER},
363 /* 0x0b */ { "SMBwrite",reply_write,AS_USER | CAN_IPC },
364 /* 0x0c */ { "SMBlock",reply_lock,AS_USER},
365 /* 0x0d */ { "SMBunlock",reply_unlock,AS_USER},
366 /* 0x0e */ { "SMBctemp",reply_ctemp,AS_USER | QUEUE_IN_OPLOCK },
367 /* 0x0f */ { "SMBmknew",reply_mknew,AS_USER},
368 /* 0x10 */ { "SMBchkpth",reply_chkpth,AS_USER},
369 /* 0x11 */ { "SMBexit",reply_exit,0},
370 /* 0x12 */ { "SMBlseek",reply_lseek,AS_USER},
371 /* 0x13 */ { "SMBlockread",reply_lockread,AS_USER},
372 /* 0x14 */ { "SMBwriteunlock",reply_writeunlock,AS_USER},
373 /* 0x15 */ { NULL, NULL, 0 },
374 /* 0x16 */ { NULL, NULL, 0 },
375 /* 0x17 */ { NULL, NULL, 0 },
376 /* 0x18 */ { NULL, NULL, 0 },
377 /* 0x19 */ { NULL, NULL, 0 },
378 /* 0x1a */ { "SMBreadbraw",reply_readbraw,AS_USER},
379 /* 0x1b */ { "SMBreadBmpx",reply_readbmpx,AS_USER},
380 /* 0x1c */ { "SMBreadBs",NULL,0 },
381 /* 0x1d */ { "SMBwritebraw",reply_writebraw,AS_USER},
382 /* 0x1e */ { "SMBwriteBmpx",reply_writebmpx,AS_USER},
383 /* 0x1f */ { "SMBwriteBs",reply_writebs,AS_USER},
384 /* 0x20 */ { "SMBwritec",NULL,0},
385 /* 0x21 */ { NULL, NULL, 0 },
386 /* 0x22 */ { "SMBsetattrE",reply_setattrE,AS_USER | NEED_WRITE },
387 /* 0x23 */ { "SMBgetattrE",reply_getattrE,AS_USER },
388 /* 0x24 */ { "SMBlockingX",reply_lockingX,AS_USER },
389 /* 0x25 */ { "SMBtrans",reply_trans,AS_USER | CAN_IPC },
390 /* 0x26 */ { "SMBtranss",NULL,AS_USER | CAN_IPC},
391 /* 0x27 */ { "SMBioctl",reply_ioctl,0},
392 /* 0x28 */ { "SMBioctls",NULL,AS_USER},
393 /* 0x29 */ { "SMBcopy",reply_copy,AS_USER | NEED_WRITE | QUEUE_IN_OPLOCK },
394 /* 0x2a */ { "SMBmove",NULL,AS_USER | NEED_WRITE | QUEUE_IN_OPLOCK },
395 /* 0x2b */ { "SMBecho",reply_echo,0},
396 /* 0x2c */ { "SMBwriteclose",reply_writeclose,AS_USER},
397 /* 0x2d */ { "SMBopenX",reply_open_and_X,AS_USER | CAN_IPC | QUEUE_IN_OPLOCK },
398 /* 0x2e */ { "SMBreadX",reply_read_and_X,AS_USER | CAN_IPC },
399 /* 0x2f */ { "SMBwriteX",reply_write_and_X,AS_USER | CAN_IPC },
400 /* 0x30 */ { NULL, NULL, 0 },
401 /* 0x31 */ { NULL, NULL, 0 },
402 /* 0x32 */ { "SMBtrans2", reply_trans2, AS_USER | CAN_IPC },
403 /* 0x33 */ { "SMBtranss2", reply_transs2, AS_USER},
404 /* 0x34 */ { "SMBfindclose", reply_findclose,AS_USER},
405 /* 0x35 */ { "SMBfindnclose", reply_findnclose, AS_USER},
406 /* 0x36 */ { NULL, NULL, 0 },
407 /* 0x37 */ { NULL, NULL, 0 },
408 /* 0x38 */ { NULL, NULL, 0 },
409 /* 0x39 */ { NULL, NULL, 0 },
410 /* 0x3a */ { NULL, NULL, 0 },
411 /* 0x3b */ { NULL, NULL, 0 },
412 /* 0x3c */ { NULL, NULL, 0 },
413 /* 0x3d */ { NULL, NULL, 0 },
414 /* 0x3e */ { NULL, NULL, 0 },
415 /* 0x3f */ { NULL, NULL, 0 },
416 /* 0x40 */ { NULL, NULL, 0 },
417 /* 0x41 */ { NULL, NULL, 0 },
418 /* 0x42 */ { NULL, NULL, 0 },
419 /* 0x43 */ { NULL, NULL, 0 },
420 /* 0x44 */ { NULL, NULL, 0 },
421 /* 0x45 */ { NULL, NULL, 0 },
422 /* 0x46 */ { NULL, NULL, 0 },
423 /* 0x47 */ { NULL, NULL, 0 },
424 /* 0x48 */ { NULL, NULL, 0 },
425 /* 0x49 */ { NULL, NULL, 0 },
426 /* 0x4a */ { NULL, NULL, 0 },
427 /* 0x4b */ { NULL, NULL, 0 },
428 /* 0x4c */ { NULL, NULL, 0 },
429 /* 0x4d */ { NULL, NULL, 0 },
430 /* 0x4e */ { NULL, NULL, 0 },
431 /* 0x4f */ { NULL, NULL, 0 },
432 /* 0x50 */ { NULL, NULL, 0 },
433 /* 0x51 */ { NULL, NULL, 0 },
434 /* 0x52 */ { NULL, NULL, 0 },
435 /* 0x53 */ { NULL, NULL, 0 },
436 /* 0x54 */ { NULL, NULL, 0 },
437 /* 0x55 */ { NULL, NULL, 0 },
438 /* 0x56 */ { NULL, NULL, 0 },
439 /* 0x57 */ { NULL, NULL, 0 },
440 /* 0x58 */ { NULL, NULL, 0 },
441 /* 0x59 */ { NULL, NULL, 0 },
442 /* 0x5a */ { NULL, NULL, 0 },
443 /* 0x5b */ { NULL, NULL, 0 },
444 /* 0x5c */ { NULL, NULL, 0 },
445 /* 0x5d */ { NULL, NULL, 0 },
446 /* 0x5e */ { NULL, NULL, 0 },
447 /* 0x5f */ { NULL, NULL, 0 },
448 /* 0x60 */ { NULL, NULL, 0 },
449 /* 0x61 */ { NULL, NULL, 0 },
450 /* 0x62 */ { NULL, NULL, 0 },
451 /* 0x63 */ { NULL, NULL, 0 },
452 /* 0x64 */ { NULL, NULL, 0 },
453 /* 0x65 */ { NULL, NULL, 0 },
454 /* 0x66 */ { NULL, NULL, 0 },
455 /* 0x67 */ { NULL, NULL, 0 },
456 /* 0x68 */ { NULL, NULL, 0 },
457 /* 0x69 */ { NULL, NULL, 0 },
458 /* 0x6a */ { NULL, NULL, 0 },
459 /* 0x6b */ { NULL, NULL, 0 },
460 /* 0x6c */ { NULL, NULL, 0 },
461 /* 0x6d */ { NULL, NULL, 0 },
462 /* 0x6e */ { NULL, NULL, 0 },
463 /* 0x6f */ { NULL, NULL, 0 },
464 /* 0x70 */ { "SMBtcon",reply_tcon,0},
465 /* 0x71 */ { "SMBtdis",reply_tdis,0},
466 /* 0x72 */ { "SMBnegprot",reply_negprot,0},
467 /* 0x73 */ { "SMBsesssetupX",reply_sesssetup_and_X,0},
468 /* 0x74 */ { "SMBulogoffX", reply_ulogoffX, 0}, /* ulogoff doesn't give a valid TID */
469 /* 0x75 */ { "SMBtconX",reply_tcon_and_X,0},
470 /* 0x76 */ { NULL, NULL, 0 },
471 /* 0x77 */ { NULL, NULL, 0 },
472 /* 0x78 */ { NULL, NULL, 0 },
473 /* 0x79 */ { NULL, NULL, 0 },
474 /* 0x7a */ { NULL, NULL, 0 },
475 /* 0x7b */ { NULL, NULL, 0 },
476 /* 0x7c */ { NULL, NULL, 0 },
477 /* 0x7d */ { NULL, NULL, 0 },
478 /* 0x7e */ { NULL, NULL, 0 },
479 /* 0x7f */ { NULL, NULL, 0 },
480 /* 0x80 */ { "SMBdskattr",reply_dskattr,AS_USER},
481 /* 0x81 */ { "SMBsearch",reply_search,AS_USER},
482 /* 0x82 */ { "SMBffirst",reply_search,AS_USER},
483 /* 0x83 */ { "SMBfunique",reply_search,AS_USER},
484 /* 0x84 */ { "SMBfclose",reply_fclose,AS_USER},
485 /* 0x85 */ { NULL, NULL, 0 },
486 /* 0x86 */ { NULL, NULL, 0 },
487 /* 0x87 */ { NULL, NULL, 0 },
488 /* 0x88 */ { NULL, NULL, 0 },
489 /* 0x89 */ { NULL, NULL, 0 },
490 /* 0x8a */ { NULL, NULL, 0 },
491 /* 0x8b */ { NULL, NULL, 0 },
492 /* 0x8c */ { NULL, NULL, 0 },
493 /* 0x8d */ { NULL, NULL, 0 },
494 /* 0x8e */ { NULL, NULL, 0 },
495 /* 0x8f */ { NULL, NULL, 0 },
496 /* 0x90 */ { NULL, NULL, 0 },
497 /* 0x91 */ { NULL, NULL, 0 },
498 /* 0x92 */ { NULL, NULL, 0 },
499 /* 0x93 */ { NULL, NULL, 0 },
500 /* 0x94 */ { NULL, NULL, 0 },
501 /* 0x95 */ { NULL, NULL, 0 },
502 /* 0x96 */ { NULL, NULL, 0 },
503 /* 0x97 */ { NULL, NULL, 0 },
504 /* 0x98 */ { NULL, NULL, 0 },
505 /* 0x99 */ { NULL, NULL, 0 },
506 /* 0x9a */ { NULL, NULL, 0 },
507 /* 0x9b */ { NULL, NULL, 0 },
508 /* 0x9c */ { NULL, NULL, 0 },
509 /* 0x9d */ { NULL, NULL, 0 },
510 /* 0x9e */ { NULL, NULL, 0 },
511 /* 0x9f */ { NULL, NULL, 0 },
512 /* 0xa0 */ { "SMBnttrans", reply_nttrans, AS_USER | CAN_IPC | QUEUE_IN_OPLOCK},
513 /* 0xa1 */ { "SMBnttranss", reply_nttranss, AS_USER | CAN_IPC },
514 /* 0xa2 */ { "SMBntcreateX", reply_ntcreate_and_X, AS_USER | CAN_IPC | QUEUE_IN_OPLOCK },
515 /* 0xa3 */ { NULL, NULL, 0 },
516 /* 0xa4 */ { "SMBntcancel", reply_ntcancel, 0 },
517 /* 0xa5 */ { NULL, NULL, 0 },
518 /* 0xa6 */ { NULL, NULL, 0 },
519 /* 0xa7 */ { NULL, NULL, 0 },
520 /* 0xa8 */ { NULL, NULL, 0 },
521 /* 0xa9 */ { NULL, NULL, 0 },
522 /* 0xaa */ { NULL, NULL, 0 },
523 /* 0xab */ { NULL, NULL, 0 },
524 /* 0xac */ { NULL, NULL, 0 },
525 /* 0xad */ { NULL, NULL, 0 },
526 /* 0xae */ { NULL, NULL, 0 },
527 /* 0xaf */ { NULL, NULL, 0 },
528 /* 0xb0 */ { NULL, NULL, 0 },
529 /* 0xb1 */ { NULL, NULL, 0 },
530 /* 0xb2 */ { NULL, NULL, 0 },
531 /* 0xb3 */ { NULL, NULL, 0 },
532 /* 0xb4 */ { NULL, NULL, 0 },
533 /* 0xb5 */ { NULL, NULL, 0 },
534 /* 0xb6 */ { NULL, NULL, 0 },
535 /* 0xb7 */ { NULL, NULL, 0 },
536 /* 0xb8 */ { NULL, NULL, 0 },
537 /* 0xb9 */ { NULL, NULL, 0 },
538 /* 0xba */ { NULL, NULL, 0 },
539 /* 0xbb */ { NULL, NULL, 0 },
540 /* 0xbc */ { NULL, NULL, 0 },
541 /* 0xbd */ { NULL, NULL, 0 },
542 /* 0xbe */ { NULL, NULL, 0 },
543 /* 0xbf */ { NULL, NULL, 0 },
544 /* 0xc0 */ { "SMBsplopen",reply_printopen,AS_USER | QUEUE_IN_OPLOCK },
545 /* 0xc1 */ { "SMBsplwr",reply_printwrite,AS_USER},
546 /* 0xc2 */ { "SMBsplclose",reply_printclose,AS_USER},
547 /* 0xc3 */ { "SMBsplretq",reply_printqueue,AS_USER},
548 /* 0xc4 */ { NULL, NULL, 0 },
549 /* 0xc5 */ { NULL, NULL, 0 },
550 /* 0xc6 */ { NULL, NULL, 0 },
551 /* 0xc7 */ { NULL, NULL, 0 },
552 /* 0xc8 */ { NULL, NULL, 0 },
553 /* 0xc9 */ { NULL, NULL, 0 },
554 /* 0xca */ { NULL, NULL, 0 },
555 /* 0xcb */ { NULL, NULL, 0 },
556 /* 0xcc */ { NULL, NULL, 0 },
557 /* 0xcd */ { NULL, NULL, 0 },
558 /* 0xce */ { NULL, NULL, 0 },
559 /* 0xcf */ { NULL, NULL, 0 },
560 /* 0xd0 */ { "SMBsends",reply_sends,AS_GUEST},
561 /* 0xd1 */ { "SMBsendb",NULL,AS_GUEST},
562 /* 0xd2 */ { "SMBfwdname",NULL,AS_GUEST},
563 /* 0xd3 */ { "SMBcancelf",NULL,AS_GUEST},
564 /* 0xd4 */ { "SMBgetmac",NULL,AS_GUEST},
565 /* 0xd5 */ { "SMBsendstrt",reply_sendstrt,AS_GUEST},
566 /* 0xd6 */ { "SMBsendend",reply_sendend,AS_GUEST},
567 /* 0xd7 */ { "SMBsendtxt",reply_sendtxt,AS_GUEST},
568 /* 0xd8 */ { NULL, NULL, 0 },
569 /* 0xd9 */ { NULL, NULL, 0 },
570 /* 0xda */ { NULL, NULL, 0 },
571 /* 0xdb */ { NULL, NULL, 0 },
572 /* 0xdc */ { NULL, NULL, 0 },
573 /* 0xdd */ { NULL, NULL, 0 },
574 /* 0xde */ { NULL, NULL, 0 },
575 /* 0xdf */ { NULL, NULL, 0 },
576 /* 0xe0 */ { NULL, NULL, 0 },
577 /* 0xe1 */ { NULL, NULL, 0 },
578 /* 0xe2 */ { NULL, NULL, 0 },
579 /* 0xe3 */ { NULL, NULL, 0 },
580 /* 0xe4 */ { NULL, NULL, 0 },
581 /* 0xe5 */ { NULL, NULL, 0 },
582 /* 0xe6 */ { NULL, NULL, 0 },
583 /* 0xe7 */ { NULL, NULL, 0 },
584 /* 0xe8 */ { NULL, NULL, 0 },
585 /* 0xe9 */ { NULL, NULL, 0 },
586 /* 0xea */ { NULL, NULL, 0 },
587 /* 0xeb */ { NULL, NULL, 0 },
588 /* 0xec */ { NULL, NULL, 0 },
589 /* 0xed */ { NULL, NULL, 0 },
590 /* 0xee */ { NULL, NULL, 0 },
591 /* 0xef */ { NULL, NULL, 0 },
592 /* 0xf0 */ { NULL, NULL, 0 },
593 /* 0xf1 */ { NULL, NULL, 0 },
594 /* 0xf2 */ { NULL, NULL, 0 },
595 /* 0xf3 */ { NULL, NULL, 0 },
596 /* 0xf4 */ { NULL, NULL, 0 },
597 /* 0xf5 */ { NULL, NULL, 0 },
598 /* 0xf6 */ { NULL, NULL, 0 },
599 /* 0xf7 */ { NULL, NULL, 0 },
600 /* 0xf8 */ { NULL, NULL, 0 },
601 /* 0xf9 */ { NULL, NULL, 0 },
602 /* 0xfa */ { NULL, NULL, 0 },
603 /* 0xfb */ { NULL, NULL, 0 },
604 /* 0xfc */ { NULL, NULL, 0 },
605 /* 0xfd */ { NULL, NULL, 0 },
606 /* 0xfe */ { NULL, NULL, 0 },
607 /* 0xff */ { NULL, NULL, 0 }
608
609 };
610
611 /*******************************************************************
612 Dump a packet to a file.
613 ********************************************************************/
614
615 static void smb_dump(const char *name, int type, char *data, ssize_t len)
616 {
617 int fd, i;
618 pstring fname;
619 if (DEBUGLEVEL < 50) return;
620
621 if (len < 4) len = smb_len(data)+4;
622 for (i=1;i<100;i++) {
623 slprintf(fname,sizeof(fname)-1, "/tmp/%s.%d.%s", name, i,
624 type ? "req" : "resp");
625 fd = open(fname, O_WRONLY|O_CREAT|O_EXCL, 0644);
626 if (fd != -1 || errno != EEXIST) break;
627 }
628 if (fd != -1) {
629 ssize_t ret = write(fd, data, len);
630 if (ret != len)
631 DEBUG(0,("smb_dump: problem: write returned %d\n", (int)ret ));
632 close(fd);
633 DEBUG(0,("created %s len %d\n", fname, len));
634 }
635 }
636
637
638 /****************************************************************************
639 Do a switch on the message type, and return the response size
640 ****************************************************************************/
641
642 static int switch_message(int type,char *inbuf,char *outbuf,int size,int bufsize)
643 {
644 static pid_t pid= (pid_t)-1;
645 int outsize = 0;
646 extern uint16 global_smbpid;
647
648 type &= 0xff;
649
650 if (pid == (pid_t)-1)
651 pid = sys_getpid();
652
653 errno = 0;
654 last_message = type;
655
656 /* Make sure this is an SMB packet. smb_size contains NetBIOS header so subtract 4 from it. */
657 if ((strncmp(smb_base(inbuf),"\377SMB",4) != 0) || (size < (smb_size - 4))) {
658 DEBUG(2,("Non-SMB packet of length %d. Terminating server\n",smb_len(inbuf)));
659 exit_server("Non-SMB packet");
660 return(-1);
661 }
662
663 /* yuck! this is an interim measure before we get rid of our
664 current inbuf/outbuf system */
665 global_smbpid = SVAL(inbuf,smb_pid);
666
667 if (smb_messages[type].fn == NULL) {
668 DEBUG(0,("Unknown message type %d!\n",type));
669 smb_dump("Unknown", 1, inbuf, size);
670 outsize = reply_unknown(inbuf,outbuf);
671 } else {
672 int flags = smb_messages[type].flags;
673 static uint16 last_session_tag = UID_FIELD_INVALID;
674 /* In share mode security we must ignore the vuid. */
675 uint16 session_tag = (lp_security() == SEC_SHARE) ? UID_FIELD_INVALID : SVAL(inbuf,smb_uid);
676 connection_struct *conn = conn_find(SVAL(inbuf,smb_tid));
677
678 DEBUG(3,("switch message %s (pid %d)\n",smb_fn_name(type),(int)pid));
679
680 smb_dump(smb_fn_name(type), 1, inbuf, size);
681 if(global_oplock_break) {
682 if(flags & QUEUE_IN_OPLOCK) {
683 /*
684 * Queue this message as we are the process of an oplock break.
685 */
686
687 DEBUG( 2, ( "switch_message: queueing message due to being in " ) );
688 DEBUGADD( 2, ( "oplock break state.\n" ) );
689
690 push_oplock_pending_smb_message( inbuf, size );
691 return -1;
692 }
693 }
694
695 /* Ensure this value is replaced in the incoming packet. */
696 SSVAL(inbuf,smb_uid,session_tag);
697
698 /*
699 * Ensure the correct username is in current_user_info.
700 * This is a really ugly bugfix for problems with
701 * multiple session_setup_and_X's being done and
702 * allowing %U and %G substitutions to work correctly.
703 * There is a reason this code is done here, don't
704 * move it unless you know what you're doing... :-).
705 * JRA.
706 */
707
708 if (session_tag != last_session_tag) {
709 user_struct *vuser = NULL;
710
711 last_session_tag = session_tag;
712 if(session_tag != UID_FIELD_INVALID)
713 vuser = get_valid_user_struct(session_tag);
714 if(vuser != NULL)
715 current_user_info = vuser->user;
716 }
717
718 /* does this protocol need to be run as root? */
719 if (!(flags & AS_USER))
720 change_to_root_user();
721
722 /* does this protocol need a valid tree connection? */
723 if ((flags & AS_USER) && !conn)
724 return ERROR_DOS(ERRSRV, ERRinvnid);
725
726
727 /* does this protocol need to be run as the connected user? */
728 if ((flags & AS_USER) && !change_to_user(conn,session_tag)) {
729 if (flags & AS_GUEST)
730 flags &= ~AS_USER;
731 else
732 return(ERROR_DOS(ERRSRV,ERRaccess));
733 }
734
735 /* this code is to work around a bug is MS client 3 without
736 introducing a security hole - it needs to be able to do
737 print queue checks as guest if it isn't logged in properly */
738 if (flags & AS_USER)
739 flags &= ~AS_GUEST;
740
741 /* does it need write permission? */
742 if ((flags & NEED_WRITE) && !CAN_WRITE(conn))
743 return(ERROR_DOS(ERRSRV,ERRaccess));
744
745 /* ipc services are limited */
746 if (IS_IPC(conn) && (flags & AS_USER) && !(flags & CAN_IPC))
747 return(ERROR_DOS(ERRSRV,ERRaccess));
748
749 /* load service specific parameters */
750 if (conn && !set_current_service(conn,(flags & AS_USER)?True:False))
751 return(ERROR_DOS(ERRSRV,ERRaccess));
752
753 /* does this protocol need to be run as guest? */
754 if ((flags & AS_GUEST) && (!change_to_guest() ||
755 !check_access(smbd_server_fd(), lp_hostsallow(-1), lp_hostsdeny(-1))))
756 return(ERROR_DOS(ERRSRV,ERRaccess));
757
758 last_inbuf = inbuf;
759
760 outsize = smb_messages[type].fn(conn, inbuf,outbuf,size,bufsize);
761 }
762
763 smb_dump(smb_fn_name(type), 0, outbuf, outsize);
764
765 return(outsize);
766 }
767
768
769 /****************************************************************************
770 Construct a reply to the incoming packet.
771 ****************************************************************************/
772
773 static int construct_reply(char *inbuf,char *outbuf,int size,int bufsize)
774 {
775 int type = CVAL(inbuf,smb_com);
776 int outsize = 0;
777 int msg_type = CVAL(inbuf,0);
778
779 GetTimeOfDay(&smb_last_time);
780
781 chain_size = 0;
782 file_chain_reset();
783 reset_chain_p();
784
785 if (msg_type != 0)
786 return(reply_special(inbuf,outbuf));
787
788 construct_reply_common(inbuf, outbuf);
789
790 outsize = switch_message(type,inbuf,outbuf,size,bufsize);
791
792 outsize += chain_size;
793
794 if(outsize > 4)
795 smb_setlen(outbuf,outsize - 4);
796 return(outsize);
797 }
798
799 /****************************************************************************
800 Keep track of the number of running smbd's. This functionality is used to
801 'hard' limit Samba overhead on resource constrained systems.
802 ****************************************************************************/
803
804 static BOOL smbd_process_limit(void)
805 {
806 int32 total_smbds;
807
808 if (lp_max_smbd_processes()) {
809
810 /* Always add one to the smbd process count, as exit_server() always
811 * subtracts one.
812 */
813
814 total_smbds = 1; /* In case we need to create the entry. */
815
816 if (!conn_tdb_ctx()) {
817 DEBUG(0,("smbd_process_limit: max smbd processes parameter set with status parameter not \
818 set. Ignoring max smbd restriction.\n"));
819 return False;
820 }
821
822 if (tdb_change_int32_atomic(conn_tdb_ctx(), "INFO/total_smbds", &total_smbds, 1) == -1)
823 return True;
824
825 return total_smbds > lp_max_smbd_processes();
826 }
827 else
828 return False;
829 }
830
831 /****************************************************************************
832 process an smb from the client - split out from the smbd_process() code so
833 it can be used by the oplock break code.
834 ****************************************************************************/
835 void process_smb(char *inbuf, char *outbuf)
836 {
837 static int trans_num;
838 int msg_type = CVAL(inbuf,0);
839 int32 len = smb_len(inbuf);
840 int nread = len + 4;
841
842 DO_PROFILE_INC(smb_count);
843
844 if (trans_num == 0) {
845 /* on the first packet, check the global hosts allow/ hosts
846 deny parameters before doing any parsing of the packet
847 passed to us by the client. This prevents attacks on our
848 parsing code from hosts not in the hosts allow list */
849 if (smbd_process_limit() ||
850 !check_access(smbd_server_fd(), lp_hostsallow(-1), lp_hostsdeny(-1))) {
851 /* send a negative session response "not listening on calling
852 name" */
853 static unsigned char buf[5] = {0x83, 0, 0, 1, 0x81};
854 DEBUG( 1, ( "Connection denied from %s\n",
855 client_addr() ) );
856 (void)send_smb(smbd_server_fd(),(char *)buf);
857 exit_server("connection denied");
858 }
859 }
860
861 DEBUG( 6, ( "got message type 0x%x of len 0x%x\n", msg_type, len ) );
862 DEBUG( 3, ( "Transaction %d of length %d\n", trans_num, nread ) );
863
864 if (msg_type == 0)
865 show_msg(inbuf);
866 else if(msg_type == SMBkeepalive)
867 return; /* Keepalive packet. */
868
869 nread = construct_reply(inbuf,outbuf,nread,max_send);
870
871 if(nread > 0)
872 {
873 if (CVAL(outbuf,0) == 0)
874 show_msg(outbuf);
875
876 if (nread != smb_len(outbuf) + 4)
877 {
878 DEBUG(0,("ERROR: Invalid message response size! %d %d\n",
879 nread, smb_len(outbuf)));
880 }
881 else
882 if (!send_smb(smbd_server_fd(),outbuf))
883 exit_server("process_smb: send_smb failed.");
884 }
885 trans_num++;
886 }
887
888
889
890 /****************************************************************************
891 return a string containing the function name of a SMB command
892 ****************************************************************************/
893 const char *smb_fn_name(int type)
894 {
895 static char *unknown_name = "SMBunknown";
896
897 if (smb_messages[type].name == NULL)
898 return(unknown_name);
899
900 return(smb_messages[type].name);
901 }
902
903
904 /****************************************************************************
905 Helper function for contruct_reply.
906 ****************************************************************************/
907
908 void construct_reply_common(char *inbuf,char *outbuf)
909 {
910 memset(outbuf,'\0',smb_size);
911
912 set_message(outbuf,0,0,True);
913 SCVAL(outbuf,smb_com,CVAL(inbuf,smb_com));
914
915 memcpy(outbuf+4,inbuf+4,4);
916 SCVAL(outbuf,smb_rcls,SMB_SUCCESS);
917 SCVAL(outbuf,smb_reh,0);
918 SCVAL(outbuf,smb_flg, FLAG_REPLY | (CVAL(inbuf,smb_flg) & FLAG_CASELESS_PATHNAMES));
919 SSVAL(outbuf,smb_flg2,
920 (SVAL(inbuf,smb_flg2) & FLAGS2_UNICODE_STRINGS) |
921 FLAGS2_LONG_PATH_COMPONENTS |
922 FLAGS2_32_BIT_ERROR_CODES | FLAGS2_EXTENDED_SECURITY);
923
924 SSVAL(outbuf,smb_err,SMB_SUCCESS);
925 SSVAL(outbuf,smb_tid,SVAL(inbuf,smb_tid));
926 SSVAL(outbuf,smb_pid,SVAL(inbuf,smb_pid));
927 SSVAL(outbuf,smb_uid,SVAL(inbuf,smb_uid));
928 SSVAL(outbuf,smb_mid,SVAL(inbuf,smb_mid));
929 }
930
931 /****************************************************************************
932 construct a chained reply and add it to the already made reply
933 **************************************************************************/
934 int chain_reply(char *inbuf,char *outbuf,int size,int bufsize)
935 {
936 static char *orig_inbuf;
937 static char *orig_outbuf;
938 int smb_com1, smb_com2 = CVAL(inbuf,smb_vwv0);
939 unsigned smb_off2 = SVAL(inbuf,smb_vwv1);
940 char *inbuf2, *outbuf2;
941 int outsize2;
942 char inbuf_saved[smb_wct];
943 char outbuf_saved[smb_wct];
944 int wct = CVAL(outbuf,smb_wct);
945 int outsize = smb_size + 2*wct + SVAL(outbuf,smb_vwv0+2*wct);
946
947 /* maybe its not chained */
948 if (smb_com2 == 0xFF) {
949 SCVAL(outbuf,smb_vwv0,0xFF);
950 return outsize;
951 }
952
953 if (chain_size == 0) {
954 /* this is the first part of the chain */
955 orig_inbuf = inbuf;
956 orig_outbuf = outbuf;
957 }
958
959 /*
960 * The original Win95 redirector dies on a reply to
961 * a lockingX and read chain unless the chain reply is
962 * 4 byte aligned. JRA.
963 */
964
965 outsize = (outsize + 3) & ~3;
966
967 /* we need to tell the client where the next part of the reply will be */
968 SSVAL(outbuf,smb_vwv1,smb_offset(outbuf+outsize,outbuf));
969 SCVAL(outbuf,smb_vwv0,smb_com2);
970
971 /* remember how much the caller added to the chain, only counting stuff
972 after the parameter words */
973 chain_size += outsize - smb_wct;
974
975 /* work out pointers into the original packets. The
976 headers on these need to be filled in */
977 inbuf2 = orig_inbuf + smb_off2 + 4 - smb_wct;
978 outbuf2 = orig_outbuf + SVAL(outbuf,smb_vwv1) + 4 - smb_wct;
979
980 /* remember the original command type */
981 smb_com1 = CVAL(orig_inbuf,smb_com);
982
983 /* save the data which will be overwritten by the new headers */
984 memcpy(inbuf_saved,inbuf2,smb_wct);
985 memcpy(outbuf_saved,outbuf2,smb_wct);
986
987 /* give the new packet the same header as the last part of the SMB */
988 memmove(inbuf2,inbuf,smb_wct);
989
990 /* create the in buffer */
991 SCVAL(inbuf2,smb_com,smb_com2);
992
993 /* create the out buffer */
994 construct_reply_common(inbuf2, outbuf2);
995
996 DEBUG(3,("Chained message\n"));
997 show_msg(inbuf2);
998
999 /* process the request */
1000 outsize2 = switch_message(smb_com2,inbuf2,outbuf2,size-chain_size,
1001 bufsize-chain_size);
1002
1003 /* copy the new reply and request headers over the old ones, but
1004 preserve the smb_com field */
1005 memmove(orig_outbuf,outbuf2,smb_wct);
1006 SCVAL(orig_outbuf,smb_com,smb_com1);
1007
1008 /* restore the saved data, being careful not to overwrite any
1009 data from the reply header */
1010 memcpy(inbuf2,inbuf_saved,smb_wct);
1011 {
1012 int ofs = smb_wct - PTR_DIFF(outbuf2,orig_outbuf);
1013 if (ofs < 0) ofs = 0;
1014 memmove(outbuf2+ofs,outbuf_saved+ofs,smb_wct-ofs);
1015 }
1016
1017 return outsize2;
1018 }
1019
1020 /****************************************************************************
1021 Setup the needed select timeout.
1022 ****************************************************************************/
1023
1024 static int setup_select_timeout(void)
1025 {
1026 int select_timeout;
1027 int t;
1028
1029 select_timeout = blocking_locks_timeout(SMBD_SELECT_TIMEOUT);
1030 select_timeout *= 1000;
1031
1032 t = change_notify_timeout();
1033 if (t != -1)
1034 select_timeout = MIN(select_timeout, t*1000);
1035
1036 if (print_notify_messages_pending())
1037 select_timeout = MIN(select_timeout, 1000);
1038
1039 return select_timeout;
1040 }
1041
1042 /****************************************************************************
1043 Check if services need reloading.
1044 ****************************************************************************/
1045
1046 void check_reload(int t)
1047 {
1048 static time_t last_smb_conf_reload_time = 0;
1049
1050 if(last_smb_conf_reload_time == 0)
1051 last_smb_conf_reload_time = t;
1052
1053 if (reload_after_sighup || (t >= last_smb_conf_reload_time+SMBD_RELOAD_CHECK))
1054 {
1055 reload_services(True);
1056 reload_after_sighup = False;
1057 last_smb_conf_reload_time = t;
1058 }
1059 }
1060
1061 /****************************************************************************
1062 Process any timeout housekeeping. Return False if the caller should exit.
1063 ****************************************************************************/
1064
1065 static BOOL timeout_processing(int deadtime, int *select_timeout, time_t *last_timeout_processing_time)
1066 {
1067 static time_t last_keepalive_sent_time = 0;
1068 static time_t last_idle_closed_check = 0;
1069 time_t t;
1070 BOOL allidle = True;
1071 extern int keepalive;
1072
1073 if (smb_read_error == READ_EOF)
1074 {
1075 DEBUG(3,("end of file from client\n"));
1076 return False;
1077 }
1078
1079 if (smb_read_error == READ_ERROR)
1080 {
1081 DEBUG(3,("receive_smb error (%s) exiting\n",
1082 strerror(errno)));
1083 return False;
1084 }
1085
1086 *last_timeout_processing_time = t = time(NULL);
1087
1088 if(last_keepalive_sent_time == 0)
1089 last_keepalive_sent_time = t;
1090
1091 if(last_idle_closed_check == 0)
1092 last_idle_closed_check = t;
1093
1094 /* become root again if waiting */
1095 change_to_root_user();
1096
1097 /* check if we need to reload services */
1098 check_reload(t);
1099
1100 /* automatic timeout if all connections are closed */
1101 if (conn_num_open()==0 && (t - last_idle_closed_check) >= IDLE_CLOSED_TIMEOUT)
1102 {
1103 DEBUG( 2, ( "Closing idle connection\n" ) );
1104 return False;
1105 }
1106 else
1107 last_idle_closed_check = t;
1108
1109 if (keepalive && (t - last_keepalive_sent_time)>keepalive)
1110 {
1111 extern struct auth_context *negprot_global_auth_context;
1112 if (!send_keepalive(smbd_server_fd())) {
1113 DEBUG( 2, ( "Keepalive failed - exiting.\n" ) );
1114 return False;
1115 }
1116
1117 /* send a keepalive for a password server or the like.
1118 This is attached to the auth_info created in the
1119 negprot */
1120 if (negprot_global_auth_context
1121 && negprot_global_auth_context->challenge_set_method
1122 && negprot_global_auth_context->challenge_set_method->send_keepalive) {
1123 negprot_global_auth_context->challenge_set_method->send_keepalive
1124 (&negprot_global_auth_context->challenge_set_method->private_data);
1125 }
1126
1127 last_keepalive_sent_time = t;
1128 }
1129
1130 /* check for connection timeouts */
1131 allidle = conn_idle_all(t, deadtime);
1132
1133 if (allidle && conn_num_open()>0) {
1134 DEBUG(2,("Closing idle connection 2.\n"));
1135 return False;
1136 }
1137
1138 if(global_machine_password_needs_changing &&
1139 /* for ADS we need to do a regular ADS password change, not a domain
1140 password change */
1141 lp_security() == SEC_DOMAIN)
1142 {
1143 unsigned char trust_passwd_hash[16];
1144 time_t lct;
1145 pstring remote_machine_list;
1146
1147 /*
1148 * We're in domain level security, and the code that
1149 * read the machine password flagged that the machine
1150 * password needs changing.
1151 */
1152
1153 /*
1154 * First, open the machine password file with an exclusive lock.
1155 */
1156
1157 if (secrets_lock_trust_account_password(global_myworkgroup, True) == False) {
1158 DEBUG(0,("process: unable to lock the machine account password for \
1159 machine %s in domain %s.\n", global_myname, global_myworkgroup ));
1160 return True;
1161 }
1162
1163 if(!secrets_fetch_trust_account_password(global_myworkgroup, trust_passwd_hash, &lct)) {
1164 DEBUG(0,("process: unable to read the machine account password for \
1165 machine %s in domain %s.\n", global_myname, global_myworkgroup ));
1166 secrets_lock_trust_account_password(global_myworkgroup, False);
1167 return True;
1168 }
1169
1170 /*
1171 * Make sure someone else hasn't already done this.
1172 */
1173
1174 if(t < lct + lp_machine_password_timeout()) {
1175 global_machine_password_needs_changing = False;
1176 secrets_lock_trust_account_password(global_myworkgroup, False);
1177 return True;
1178 }
1179
1180 pstrcpy(remote_machine_list, lp_passwordserver());
1181
1182 change_trust_account_password( global_myworkgroup, remote_machine_list);
1183 global_machine_password_needs_changing = False;
1184 secrets_lock_trust_account_password(global_myworkgroup, False);
1185 }
1186
1187 /*
1188 * Check to see if we have any blocking locks
1189 * outstanding on the queue.
1190 */
1191 process_blocking_lock_queue(t);
1192
1193 /*
1194 * Check to see if we have any change notifies
1195 * outstanding on the queue.
1196 */
1197 process_pending_change_notify_queue(t);
1198
1199 /*
1200 * Now we are root, check if the log files need pruning.
1201 * Force a log file check.
1202 */
1203 force_check_log_size();
1204 check_log_size();
1205
1206 /* Send any queued printer notify message to interested smbd's. */
1207
1208 print_notify_send_messages();
1209
1210 /*
1211 * Modify the select timeout depending upon
1212 * what we have remaining in our queues.
1213 */
1214
1215 *select_timeout = setup_select_timeout();
1216
1217 return True;
1218 }
1219
1220 /****************************************************************************
1221 process commands from the client
1222 ****************************************************************************/
1223
1224 void smbd_process(void)
1225 {
1226 extern int smb_echo_count;
1227 time_t last_timeout_processing_time = time(NULL);
1228 unsigned int num_smbs = 0;
1229
1230 InBuffer = (char *)malloc(BUFFER_SIZE + LARGE_WRITEX_HDR_SIZE + SAFETY_MARGIN);
1231 OutBuffer = (char *)malloc(BUFFER_SIZE + LARGE_WRITEX_HDR_SIZE + SAFETY_MARGIN);
1232 if ((InBuffer == NULL) || (OutBuffer == NULL))
1233 return;
1234
1235 max_recv = MIN(lp_maxxmit(),BUFFER_SIZE);
1236
1237 while (True) {
1238 int deadtime = lp_deadtime()*60;
1239 int select_timeout = setup_select_timeout();
1240 int num_echos;
1241
1242 if (deadtime <= 0)
1243 deadtime = DEFAULT_SMBD_TIMEOUT;
1244
1245 errno = 0;
1246
1247 /* free up temporary memory */
1248 lp_talloc_free();
1249 main_loop_talloc_free();
1250
1251 while (!receive_message_or_smb(InBuffer,BUFFER_SIZE+LARGE_WRITEX_HDR_SIZE,select_timeout)) {
1252 if(!timeout_processing( deadtime, &select_timeout, &last_timeout_processing_time))
1253 return;
1254 num_smbs = 0; /* Reset smb counter. */
1255 }
1256
1257 /*
1258 * Ensure we do timeout processing if the SMB we just got was
1259 * only an echo request. This allows us to set the select
1260 * timeout in 'receive_message_or_smb()' to any value we like
1261 * without worrying that the client will send echo requests
1262 * faster than the select timeout, thus starving out the
1263 * essential processing (change notify, blocking locks) that
1264 * the timeout code does. JRA.
1265 */
1266 num_echos = smb_echo_count;
1267
1268 process_smb(InBuffer, OutBuffer);
1269
1270 if (smb_echo_count != num_echos) {
1271 if(!timeout_processing( deadtime, &select_timeout, &last_timeout_processing_time))
1272 return;
1273 num_smbs = 0; /* Reset smb counter. */
1274 }
1275
1276 num_smbs++;
1277
1278 /*
1279 * If we are getting smb requests in a constant stream
1280 * with no echos, make sure we attempt timeout processing
1281 * every select_timeout milliseconds - but only check for this
1282 * every 200 smb requests.
1283 */
1284
1285 if ((num_smbs % 200) == 0) {
1286 time_t new_check_time = time(NULL);
1287 if(new_check_time - last_timeout_processing_time >= (select_timeout/1000)) {
1288 if(!timeout_processing( deadtime, &select_timeout, &last_timeout_processing_time))
1289 return;
1290 num_smbs = 0; /* Reset smb counter. */
1291 last_timeout_processing_time = new_check_time; /* Reset time. */
1292 }
1293 }
1294 }
1295 }
WIP