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 pstring sesssetup_user;
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 a select on an two fd's - with timeout.
115 If a local udp message has been pushed onto the
116 queue (this can only happen during oplock break
117 processing) return this first.
119 If a pending smb message has been pushed onto the
120 queue (this can only happen during oplock break
121 processing) return this next.
123 If the first smbfd is ready then read an smb from it.
124 if the second (loopback UDP) fd is ready then read a message
125 from it and setup the buffer header to identify the length
127 Returns False on timeout or error.
130 The timeout is in milli seconds
131 ****************************************************************************/
133 static BOOL receive_message_or_smb(char *buffer, int buffer_len,
134 int timeout, BOOL *got_smb)
146 * Check to see if we already have a message on the smb queue.
147 * If so - copy and return it.
150 if(ubi_slCount(&smb_oplock_queue) != 0)
152 pending_message_list *msg = (pending_message_list *)ubi_slRemHead(&smb_oplock_queue);
153 memcpy(buffer, msg->msg_buf, MIN(buffer_len, msg->msg_len));
155 /* Free the message we just copied. */
156 free((char *)msg->msg_buf);
160 DEBUG(5,("receive_message_or_smb: returning queued smb message.\n"));
165 * Setup the select read fd set.
169 FD_SET(smbd_server_fd(),&fds);
170 maxfd = setup_oplock_select_set(&fds);
172 to.tv_sec = timeout / 1000;
173 to.tv_usec = (timeout % 1000) * 1000;
175 selrtn = sys_select(MAX(maxfd,smbd_server_fd())+1,&fds,timeout>0?&to:NULL);
179 /* something is wrong. Maybe the socket is dead? */
180 smb_read_error = READ_ERROR;
184 /* Did we timeout ? */
186 smb_read_error = READ_TIMEOUT;
190 if (FD_ISSET(smbd_server_fd(),&fds))
193 return receive_smb(smbd_server_fd(), buffer, 0);
197 return receive_local_message(&fds, buffer, buffer_len, 0);
201 /****************************************************************************
202 Get the next SMB packet, doing the local message processing automatically.
203 ****************************************************************************/
205 BOOL receive_next_smb(char *inbuf, int bufsize, int timeout)
207 BOOL got_smb = False;
212 ret = receive_message_or_smb(inbuf,bufsize,timeout,&got_smb);
216 /* Deal with oplock break requests from other smbd's. */
217 process_local_message(inbuf, bufsize);
221 if(ret && (CVAL(inbuf,0) == 0x85))
223 /* Keepalive packet. */
228 while(ret && !got_smb);
233 /****************************************************************************
234 We're terminating and have closed all our files/connections etc.
235 If there are any pending local messages we need to respond to them
236 before termination so that other smbds don't think we just died whilst
238 ****************************************************************************/
240 void respond_to_all_remaining_local_messages(void)
246 * Assert we have no exclusive open oplocks.
249 if(get_number_of_exclusive_open_oplocks()) {
250 DEBUG(0,("respond_to_all_remaining_local_messages: PANIC : we have %d exclusive oplocks.\n",
251 get_number_of_exclusive_open_oplocks() ));
256 * Setup the select read fd set.
260 if(!setup_oplock_select_set(&fds))
264 * Keep doing receive_local_message with a 1 ms timeout until
265 * we have no more messages.
268 while(receive_local_message(&fds, buffer, sizeof(buffer), 1)) {
269 /* Deal with oplock break requests from other smbd's. */
270 process_local_message(buffer, sizeof(buffer));
273 (void)setup_oplock_select_set(&fds);
281 These flags determine some of the permissions required to do an operation
283 Note that I don't set NEED_WRITE on some write operations because they
284 are used by some brain-dead clients when printing, and I don't want to
285 force write permissions on print services.
287 #define AS_USER (1<<0)
288 #define NEED_WRITE (1<<1)
289 #define TIME_INIT (1<<2)
290 #define CAN_IPC (1<<3)
291 #define AS_GUEST (1<<5)
292 #define QUEUE_IN_OPLOCK (1<<6)
295 define a list of possible SMB messages and their corresponding
296 functions. Any message that has a NULL function is unimplemented -
297 please feel free to contribute implementations!
299 struct smb_message_struct
303 int (*fn)(connection_struct *conn, char *, char *, int, int);
310 {SMBnegprot,"SMBnegprot",reply_negprot,0},
311 {SMBtcon,"SMBtcon",reply_tcon,0},
312 {SMBtdis,"SMBtdis",reply_tdis,0},
313 {SMBexit,"SMBexit",reply_exit,0},
314 {SMBioctl,"SMBioctl",reply_ioctl,0},
315 {SMBecho,"SMBecho",reply_echo,0},
316 {SMBsesssetupX,"SMBsesssetupX",reply_sesssetup_and_X,0},
317 {SMBtconX,"SMBtconX",reply_tcon_and_X,0},
318 {SMBulogoffX, "SMBulogoffX", reply_ulogoffX, 0}, /* ulogoff doesn't give a valid TID */
319 {SMBgetatr,"SMBgetatr",reply_getatr,AS_USER},
320 {SMBsetatr,"SMBsetatr",reply_setatr,AS_USER | NEED_WRITE},
321 {SMBchkpth,"SMBchkpth",reply_chkpth,AS_USER},
322 {SMBsearch,"SMBsearch",reply_search,AS_USER},
323 {SMBopen,"SMBopen",reply_open,AS_USER | QUEUE_IN_OPLOCK },
325 /* note that SMBmknew and SMBcreate are deliberately overloaded */
326 {SMBcreate,"SMBcreate",reply_mknew,AS_USER},
327 {SMBmknew,"SMBmknew",reply_mknew,AS_USER},
329 {SMBunlink,"SMBunlink",reply_unlink,AS_USER | NEED_WRITE | QUEUE_IN_OPLOCK},
330 {SMBread,"SMBread",reply_read,AS_USER},
331 {SMBwrite,"SMBwrite",reply_write,AS_USER | CAN_IPC },
332 {SMBclose,"SMBclose",reply_close,AS_USER | CAN_IPC },
333 {SMBmkdir,"SMBmkdir",reply_mkdir,AS_USER | NEED_WRITE},
334 {SMBrmdir,"SMBrmdir",reply_rmdir,AS_USER | NEED_WRITE},
335 {SMBdskattr,"SMBdskattr",reply_dskattr,AS_USER},
336 {SMBmv,"SMBmv",reply_mv,AS_USER | NEED_WRITE | QUEUE_IN_OPLOCK},
338 /* this is a Pathworks specific call, allowing the
339 changing of the root path */
340 {pSETDIR,"pSETDIR",reply_setdir,AS_USER},
342 {SMBlseek,"SMBlseek",reply_lseek,AS_USER},
343 {SMBflush,"SMBflush",reply_flush,AS_USER},
344 {SMBctemp,"SMBctemp",reply_ctemp,AS_USER | QUEUE_IN_OPLOCK },
345 {SMBsplopen,"SMBsplopen",reply_printopen,AS_USER | QUEUE_IN_OPLOCK },
346 {SMBsplclose,"SMBsplclose",reply_printclose,AS_USER},
347 {SMBsplretq,"SMBsplretq",reply_printqueue,AS_USER},
348 {SMBsplwr,"SMBsplwr",reply_printwrite,AS_USER},
349 {SMBlock,"SMBlock",reply_lock,AS_USER},
350 {SMBunlock,"SMBunlock",reply_unlock,AS_USER},
352 /* CORE+ PROTOCOL FOLLOWS */
354 {SMBreadbraw,"SMBreadbraw",reply_readbraw,AS_USER},
355 {SMBwritebraw,"SMBwritebraw",reply_writebraw,AS_USER},
356 {SMBwriteclose,"SMBwriteclose",reply_writeclose,AS_USER},
357 {SMBlockread,"SMBlockread",reply_lockread,AS_USER},
358 {SMBwriteunlock,"SMBwriteunlock",reply_writeunlock,AS_USER},
360 /* LANMAN1.0 PROTOCOL FOLLOWS */
362 {SMBreadBmpx,"SMBreadBmpx",reply_readbmpx,AS_USER},
363 {SMBreadBs,"SMBreadBs",NULL,AS_USER},
364 {SMBwriteBmpx,"SMBwriteBmpx",reply_writebmpx,AS_USER},
365 {SMBwriteBs,"SMBwriteBs",reply_writebs,AS_USER},
366 {SMBwritec,"SMBwritec",NULL,AS_USER},
367 {SMBsetattrE,"SMBsetattrE",reply_setattrE,AS_USER | NEED_WRITE },
368 {SMBgetattrE,"SMBgetattrE",reply_getattrE,AS_USER },
369 {SMBtrans,"SMBtrans",reply_trans,AS_USER | CAN_IPC | QUEUE_IN_OPLOCK},
370 {SMBtranss,"SMBtranss",NULL,AS_USER | CAN_IPC},
371 {SMBioctls,"SMBioctls",NULL,AS_USER},
372 {SMBcopy,"SMBcopy",reply_copy,AS_USER | NEED_WRITE | QUEUE_IN_OPLOCK },
373 {SMBmove,"SMBmove",NULL,AS_USER | NEED_WRITE | QUEUE_IN_OPLOCK },
375 {SMBopenX,"SMBopenX",reply_open_and_X,AS_USER | CAN_IPC | QUEUE_IN_OPLOCK },
376 {SMBreadX,"SMBreadX",reply_read_and_X,AS_USER | CAN_IPC },
377 {SMBwriteX,"SMBwriteX",reply_write_and_X,AS_USER | CAN_IPC },
378 {SMBlockingX,"SMBlockingX",reply_lockingX,AS_USER },
380 {SMBffirst,"SMBffirst",reply_search,AS_USER},
381 {SMBfunique,"SMBfunique",reply_search,AS_USER},
382 {SMBfclose,"SMBfclose",reply_fclose,AS_USER},
384 /* LANMAN2.0 PROTOCOL FOLLOWS */
385 {SMBfindnclose, "SMBfindnclose", reply_findnclose, AS_USER},
386 {SMBfindclose, "SMBfindclose", reply_findclose,AS_USER},
387 {SMBtrans2, "SMBtrans2", reply_trans2, AS_USER | QUEUE_IN_OPLOCK | CAN_IPC },
388 {SMBtranss2, "SMBtranss2", reply_transs2, AS_USER},
390 /* NT PROTOCOL FOLLOWS */
391 {SMBntcreateX, "SMBntcreateX", reply_ntcreate_and_X, AS_USER | CAN_IPC | QUEUE_IN_OPLOCK },
392 {SMBnttrans, "SMBnttrans", reply_nttrans, AS_USER | CAN_IPC | QUEUE_IN_OPLOCK},
393 {SMBnttranss, "SMBnttranss", reply_nttranss, AS_USER | CAN_IPC },
394 {SMBntcancel, "SMBntcancel", reply_ntcancel, 0 },
396 /* messaging routines */
397 {SMBsends,"SMBsends",reply_sends,AS_GUEST},
398 {SMBsendstrt,"SMBsendstrt",reply_sendstrt,AS_GUEST},
399 {SMBsendend,"SMBsendend",reply_sendend,AS_GUEST},
400 {SMBsendtxt,"SMBsendtxt",reply_sendtxt,AS_GUEST},
402 /* NON-IMPLEMENTED PARTS OF THE CORE PROTOCOL */
404 {SMBsendb,"SMBsendb",NULL,AS_GUEST},
405 {SMBfwdname,"SMBfwdname",NULL,AS_GUEST},
406 {SMBcancelf,"SMBcancelf",NULL,AS_GUEST},
407 {SMBgetmac,"SMBgetmac",NULL,AS_GUEST}
411 /****************************************************************************
412 do a switch on the message type, and return the response size
413 ****************************************************************************/
414 static int switch_message(int type,char *inbuf,char *outbuf,int size,int bufsize)
416 static pid_t pid= (pid_t)-1;
418 static int num_smb_messages =
419 sizeof(smb_messages) / sizeof(struct smb_message_struct);
421 extern int global_smbpid;
423 if (pid == (pid_t)-1)
429 /* make sure this is an SMB packet */
430 if (strncmp(smb_base(inbuf),"\377SMB",4) != 0)
432 DEBUG(2,("Non-SMB packet of length %d\n",smb_len(inbuf)));
436 for (match=0;match<num_smb_messages;match++)
437 if (smb_messages[match].code == type)
440 /* yuck! this is an interim measure before we get rid of our
441 current inbuf/outbuf system */
442 global_smbpid = SVAL(inbuf,smb_pid);
444 if (match == num_smb_messages)
446 DEBUG(0,("Unknown message type %d!\n",type));
447 outsize = reply_unknown(inbuf,outbuf);
451 DEBUG(3,("switch message %s (pid %d)\n",smb_messages[match].name,(int)pid));
453 if(global_oplock_break)
455 int flags = smb_messages[match].flags;
457 if(flags & QUEUE_IN_OPLOCK)
460 * Queue this message as we are the process of an oplock break.
463 DEBUG( 2, ( "switch_message: queueing message due to being in " ) );
464 DEBUGADD( 2, ( "oplock break state.\n" ) );
466 push_oplock_pending_smb_message( inbuf, size );
470 if (smb_messages[match].fn)
472 int flags = smb_messages[match].flags;
473 static uint16 last_session_tag = UID_FIELD_INVALID;
474 /* In share mode security we must ignore the vuid. */
475 uint16 session_tag = (lp_security() == SEC_SHARE) ? UID_FIELD_INVALID : SVAL(inbuf,smb_uid);
476 connection_struct *conn = conn_find(SVAL(inbuf,smb_tid));
479 /* Ensure this value is replaced in the incoming packet. */
480 SSVAL(inbuf,smb_uid,session_tag);
483 * Ensure the correct username is in sesssetup_user.
484 * This is a really ugly bugfix for problems with
485 * multiple session_setup_and_X's being done and
486 * allowing %U and %G substitutions to work correctly.
487 * There is a reason this code is done here, don't
488 * move it unless you know what you're doing... :-).
491 if (session_tag != last_session_tag) {
492 user_struct *vuser = NULL;
494 last_session_tag = session_tag;
495 if(session_tag != UID_FIELD_INVALID)
496 vuser = get_valid_user_struct(session_tag);
498 pstrcpy( sesssetup_user, vuser->requested_name);
501 /* does this protocol need to be run as root? */
502 if (!(flags & AS_USER))
505 /* does this protocol need to be run as the connected user? */
506 if ((flags & AS_USER) && !become_user(conn,session_tag)) {
507 if (flags & AS_GUEST)
510 return(ERROR(ERRSRV,ERRaccess));
512 /* this code is to work around a bug is MS client 3 without
513 introducing a security hole - it needs to be able to do
514 print queue checks as guest if it isn't logged in properly */
518 /* does it need write permission? */
519 if ((flags & NEED_WRITE) && !CAN_WRITE(conn))
520 return(ERROR(ERRSRV,ERRaccess));
522 /* ipc services are limited */
523 if (IS_IPC(conn) && (flags & AS_USER) && !(flags & CAN_IPC)) {
524 return(ERROR(ERRSRV,ERRaccess));
527 /* load service specific parameters */
529 !become_service(conn,(flags & AS_USER)?True:False)) {
530 return(ERROR(ERRSRV,ERRaccess));
533 /* does this protocol need to be run as guest? */
534 if ((flags & AS_GUEST) &&
536 !check_access(smbd_server_fd(), lp_hostsallow(-1), lp_hostsdeny(-1)))) {
537 return(ERROR(ERRSRV,ERRaccess));
542 outsize = smb_messages[match].fn(conn, inbuf,outbuf,size,bufsize);
546 outsize = reply_unknown(inbuf,outbuf);
554 /****************************************************************************
555 construct a reply to the incoming packet
556 ****************************************************************************/
557 static int construct_reply(char *inbuf,char *outbuf,int size,int bufsize)
559 int type = CVAL(inbuf,smb_com);
561 int msg_type = CVAL(inbuf,0);
563 GetTimeOfDay(&smb_last_time);
570 return(reply_special(inbuf,outbuf));
572 construct_reply_common(inbuf, outbuf);
574 outsize = switch_message(type,inbuf,outbuf,size,bufsize);
576 outsize += chain_size;
579 smb_setlen(outbuf,outsize - 4);
584 /****************************************************************************
585 process an smb from the client - split out from the process() code so
586 it can be used by the oplock break code.
587 ****************************************************************************/
588 void process_smb(char *inbuf, char *outbuf)
591 extern BOOL sslEnabled; /* don't use function for performance reasons */
592 static int sslConnected = 0;
593 #endif /* WITH_SSL */
594 static int trans_num;
595 int msg_type = CVAL(inbuf,0);
596 int32 len = smb_len(inbuf);
600 profile_p->smb_count++;
603 if (trans_num == 0) {
604 /* on the first packet, check the global hosts allow/ hosts
605 deny parameters before doing any parsing of the packet
606 passed to us by the client. This prevents attacks on our
607 parsing code from hosts not in the hosts allow list */
608 if (!check_access(smbd_server_fd(), lp_hostsallow(-1), lp_hostsdeny(-1))) {
609 /* send a negative session response "not listining on calling
611 static unsigned char buf[5] = {0x83, 0, 0, 1, 0x81};
612 DEBUG( 1, ( "Connection denied from %s\n",
614 send_smb(smbd_server_fd(),(char *)buf);
615 exit_server("connection denied");
619 DEBUG( 6, ( "got message type 0x%x of len 0x%x\n", msg_type, len ) );
620 DEBUG( 3, ( "Transaction %d of length %d\n", trans_num, nread ) );
623 if(sslEnabled && !sslConnected){
624 sslConnected = sslutil_negotiate_ssl(smbd_server_fd(), msg_type);
625 if(sslConnected < 0){ /* an error occured */
626 exit_server("SSL negotiation failed");
627 }else if(sslConnected){
632 #endif /* WITH_SSL */
636 else if(msg_type == 0x85)
637 return; /* Keepalive packet. */
639 nread = construct_reply(inbuf,outbuf,nread,max_send);
643 if (CVAL(outbuf,0) == 0)
646 if (nread != smb_len(outbuf) + 4)
648 DEBUG(0,("ERROR: Invalid message response size! %d %d\n",
649 nread, smb_len(outbuf)));
652 send_smb(smbd_server_fd(),outbuf);
659 /****************************************************************************
660 return a string containing the function name of a SMB command
661 ****************************************************************************/
662 char *smb_fn_name(int type)
664 static char *unknown_name = "SMBunknown";
665 static int num_smb_messages =
666 sizeof(smb_messages) / sizeof(struct smb_message_struct);
669 for (match=0;match<num_smb_messages;match++)
670 if (smb_messages[match].code == type)
673 if (match == num_smb_messages)
674 return(unknown_name);
676 return(smb_messages[match].name);
680 /****************************************************************************
681 Helper function for contruct_reply.
682 ****************************************************************************/
684 void construct_reply_common(char *inbuf,char *outbuf)
686 memset(outbuf,'\0',smb_size);
688 set_message(outbuf,0,0,True);
689 CVAL(outbuf,smb_com) = CVAL(inbuf,smb_com);
691 memcpy(outbuf+4,inbuf+4,4);
692 CVAL(outbuf,smb_rcls) = SMB_SUCCESS;
693 CVAL(outbuf,smb_reh) = 0;
694 SCVAL(outbuf,smb_flg, FLAG_REPLY | (CVAL(inbuf,smb_flg) & FLAG_CASELESS_PATHNAMES)); /* bit 7 set
696 SSVAL(outbuf,smb_flg2,FLAGS2_LONG_PATH_COMPONENTS);
697 /* say we support long filenames */
699 SSVAL(outbuf,smb_err,SMB_SUCCESS);
700 SSVAL(outbuf,smb_tid,SVAL(inbuf,smb_tid));
701 SSVAL(outbuf,smb_pid,SVAL(inbuf,smb_pid));
702 SSVAL(outbuf,smb_uid,SVAL(inbuf,smb_uid));
703 SSVAL(outbuf,smb_mid,SVAL(inbuf,smb_mid));
706 /****************************************************************************
707 construct a chained reply and add it to the already made reply
708 **************************************************************************/
709 int chain_reply(char *inbuf,char *outbuf,int size,int bufsize)
711 static char *orig_inbuf;
712 static char *orig_outbuf;
713 int smb_com1, smb_com2 = CVAL(inbuf,smb_vwv0);
714 unsigned smb_off2 = SVAL(inbuf,smb_vwv1);
715 char *inbuf2, *outbuf2;
717 char inbuf_saved[smb_wct];
718 char outbuf_saved[smb_wct];
719 int wct = CVAL(outbuf,smb_wct);
720 int outsize = smb_size + 2*wct + SVAL(outbuf,smb_vwv0+2*wct);
722 /* maybe its not chained */
723 if (smb_com2 == 0xFF) {
724 CVAL(outbuf,smb_vwv0) = 0xFF;
728 if (chain_size == 0) {
729 /* this is the first part of the chain */
731 orig_outbuf = outbuf;
735 * The original Win95 redirector dies on a reply to
736 * a lockingX and read chain unless the chain reply is
737 * 4 byte aligned. JRA.
740 outsize = (outsize + 3) & ~3;
742 /* we need to tell the client where the next part of the reply will be */
743 SSVAL(outbuf,smb_vwv1,smb_offset(outbuf+outsize,outbuf));
744 CVAL(outbuf,smb_vwv0) = smb_com2;
746 /* remember how much the caller added to the chain, only counting stuff
747 after the parameter words */
748 chain_size += outsize - smb_wct;
750 /* work out pointers into the original packets. The
751 headers on these need to be filled in */
752 inbuf2 = orig_inbuf + smb_off2 + 4 - smb_wct;
753 outbuf2 = orig_outbuf + SVAL(outbuf,smb_vwv1) + 4 - smb_wct;
755 /* remember the original command type */
756 smb_com1 = CVAL(orig_inbuf,smb_com);
758 /* save the data which will be overwritten by the new headers */
759 memcpy(inbuf_saved,inbuf2,smb_wct);
760 memcpy(outbuf_saved,outbuf2,smb_wct);
762 /* give the new packet the same header as the last part of the SMB */
763 memmove(inbuf2,inbuf,smb_wct);
765 /* create the in buffer */
766 CVAL(inbuf2,smb_com) = smb_com2;
768 /* create the out buffer */
769 construct_reply_common(inbuf2, outbuf2);
771 DEBUG(3,("Chained message\n"));
774 /* process the request */
775 outsize2 = switch_message(smb_com2,inbuf2,outbuf2,size-chain_size,
778 /* copy the new reply and request headers over the old ones, but
779 preserve the smb_com field */
780 memmove(orig_outbuf,outbuf2,smb_wct);
781 CVAL(orig_outbuf,smb_com) = smb_com1;
783 /* restore the saved data, being careful not to overwrite any
784 data from the reply header */
785 memcpy(inbuf2,inbuf_saved,smb_wct);
787 int ofs = smb_wct - PTR_DIFF(outbuf2,orig_outbuf);
788 if (ofs < 0) ofs = 0;
789 memmove(outbuf2+ofs,outbuf_saved+ofs,smb_wct-ofs);
795 /****************************************************************************
796 Setup the needed select timeout.
797 ****************************************************************************/
799 static int setup_select_timeout(void)
801 int change_notify_timeout = lp_change_notify_timeout() * 1000;
805 * Increase the select timeout back to SMBD_SELECT_TIMEOUT if we
806 * have removed any blocking locks. JRA.
809 select_timeout = blocking_locks_pending() ? SMBD_SELECT_TIMEOUT_WITH_PENDING_LOCKS*1000 :
810 SMBD_SELECT_TIMEOUT*1000;
812 if (change_notifies_pending())
813 select_timeout = MIN(select_timeout, change_notify_timeout);
815 return select_timeout;
818 /****************************************************************************
819 Check if services need reloading.
820 ****************************************************************************/
822 void check_reload(int t)
824 static time_t last_smb_conf_reload_time = 0;
826 if(last_smb_conf_reload_time == 0)
827 last_smb_conf_reload_time = t;
829 if (reload_after_sighup || (t >= last_smb_conf_reload_time+SMBD_RELOAD_CHECK))
831 reload_services(True);
832 reload_after_sighup = False;
833 last_smb_conf_reload_time = t;
837 /****************************************************************************
838 Process any timeout housekeeping. Return False if the caller should exit.
839 ****************************************************************************/
841 static BOOL timeout_processing(int deadtime, int *select_timeout, time_t *last_timeout_processing_time)
843 static time_t last_keepalive_sent_time = 0;
844 static time_t last_idle_closed_check = 0;
847 extern int keepalive;
849 if (smb_read_error == READ_EOF)
851 DEBUG(3,("end of file from client\n"));
855 if (smb_read_error == READ_ERROR)
857 DEBUG(3,("receive_smb error (%s) exiting\n",
862 *last_timeout_processing_time = t = time(NULL);
864 if(last_keepalive_sent_time == 0)
865 last_keepalive_sent_time = t;
867 if(last_idle_closed_check == 0)
868 last_idle_closed_check = t;
870 /* become root again if waiting */
873 /* check if we need to reload services */
876 /* automatic timeout if all connections are closed */
877 if (conn_num_open()==0 && (t - last_idle_closed_check) >= IDLE_CLOSED_TIMEOUT)
879 DEBUG( 2, ( "Closing idle connection\n" ) );
883 last_idle_closed_check = t;
885 if (keepalive && (t - last_keepalive_sent_time)>keepalive)
887 struct cli_state *cli = server_client();
888 if (!send_keepalive(smbd_server_fd())) {
889 DEBUG( 2, ( "Keepalive failed - exiting.\n" ) );
892 /* also send a keepalive to the password server if its still
894 if (cli && cli->initialised)
895 send_keepalive(cli->fd);
896 last_keepalive_sent_time = t;
899 /* check for connection timeouts */
900 allidle = conn_idle_all(t, deadtime);
902 if (allidle && conn_num_open()>0) {
903 DEBUG(2,("Closing idle connection 2.\n"));
907 if(global_machine_password_needs_changing)
909 unsigned char trust_passwd_hash[16];
911 pstring remote_machine_list;
914 * We're in domain level security, and the code that
915 * read the machine password flagged that the machine
916 * password needs changing.
920 * First, open the machine password file with an exclusive lock.
923 if(!trust_password_lock( global_myworkgroup, global_myname, True)) {
924 DEBUG(0,("process: unable to open the machine account password file for \
925 machine %s in domain %s.\n", global_myname, global_myworkgroup ));
929 if(!get_trust_account_password( trust_passwd_hash, &lct)) {
930 DEBUG(0,("process: unable to read the machine account password for \
931 machine %s in domain %s.\n", global_myname, global_myworkgroup ));
932 trust_password_unlock();
937 * Make sure someone else hasn't already done this.
940 if(t < lct + lp_machine_password_timeout()) {
941 trust_password_unlock();
942 global_machine_password_needs_changing = False;
946 pstrcpy(remote_machine_list, lp_passwordserver());
948 change_trust_account_password( global_myworkgroup, remote_machine_list);
949 trust_password_unlock();
950 global_machine_password_needs_changing = False;
954 * Check to see if we have any blocking locks
955 * outstanding on the queue.
957 process_blocking_lock_queue(t);
960 * Check to see if we have any change notifies
961 * outstanding on the queue.
963 process_pending_change_notify_queue(t);
966 * Now we are root, check if the log files need pruning.
968 if(need_to_check_log_size())
972 * Modify the select timeout depending upon
973 * what we have remaining in our queues.
976 *select_timeout = setup_select_timeout();
981 /****************************************************************************
982 process commands from the client
983 ****************************************************************************/
985 void smbd_process(void)
987 extern int smb_echo_count;
988 time_t last_timeout_processing_time = time(NULL);
989 unsigned int num_smbs = 0;
991 InBuffer = (char *)malloc(BUFFER_SIZE + SAFETY_MARGIN);
992 OutBuffer = (char *)malloc(BUFFER_SIZE + SAFETY_MARGIN);
993 if ((InBuffer == NULL) || (OutBuffer == NULL))
996 InBuffer += SMB_ALIGNMENT;
997 OutBuffer += SMB_ALIGNMENT;
999 max_recv = MIN(lp_maxxmit(),BUFFER_SIZE);
1001 /* re-initialise the timezone */
1006 int deadtime = lp_deadtime()*60;
1007 BOOL got_smb = False;
1008 int select_timeout = setup_select_timeout();
1011 deadtime = DEFAULT_SMBD_TIMEOUT;
1013 #if USE_READ_PREDICTION
1014 if (lp_readprediction())
1015 do_read_prediction();
1020 /* free up temporary memory */
1023 while(!receive_message_or_smb(InBuffer,BUFFER_SIZE,select_timeout,&got_smb))
1025 if(!timeout_processing( deadtime, &select_timeout, &last_timeout_processing_time))
1027 num_smbs = 0; /* Reset smb counter. */
1032 * Ensure we do timeout processing if the SMB we just got was
1033 * only an echo request. This allows us to set the select
1034 * timeout in 'receive_message_or_smb()' to any value we like
1035 * without worrying that the client will send echo requests
1036 * faster than the select timeout, thus starving out the
1037 * essential processing (change notify, blocking locks) that
1038 * the timeout code does. JRA.
1040 int num_echos = smb_echo_count;
1042 process_smb(InBuffer, OutBuffer);
1044 if(smb_echo_count != num_echos) {
1045 if(!timeout_processing( deadtime, &select_timeout, &last_timeout_processing_time))
1047 num_smbs = 0; /* Reset smb counter. */
1053 * If we are getting smb requests in a constant stream
1054 * with no echos, make sure we attempt timeout processing
1055 * every select_timeout milliseconds - but only check for this
1056 * every 200 smb requests.
1059 if((num_smbs % 200) == 0) {
1060 time_t new_check_time = time(NULL);
1061 if(last_timeout_processing_time - new_check_time >= (select_timeout/1000)) {
1062 if(!timeout_processing( deadtime, &select_timeout, &last_timeout_processing_time))
1064 num_smbs = 0; /* Reset smb counter. */
1065 last_timeout_processing_time = new_check_time; /* Reset time. */
1070 process_local_message(InBuffer, BUFFER_SIZE);