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 */
635 if(trans_num == 1 && VT_Check(inbuf))
644 else if(msg_type == 0x85)
645 return; /* Keepalive packet. */
647 nread = construct_reply(inbuf,outbuf,nread,max_send);
651 if (CVAL(outbuf,0) == 0)
654 if (nread != smb_len(outbuf) + 4)
656 DEBUG(0,("ERROR: Invalid message response size! %d %d\n",
657 nread, smb_len(outbuf)));
660 send_smb(smbd_server_fd(),outbuf);
667 /****************************************************************************
668 return a string containing the function name of a SMB command
669 ****************************************************************************/
670 char *smb_fn_name(int type)
672 static char *unknown_name = "SMBunknown";
673 static int num_smb_messages =
674 sizeof(smb_messages) / sizeof(struct smb_message_struct);
677 for (match=0;match<num_smb_messages;match++)
678 if (smb_messages[match].code == type)
681 if (match == num_smb_messages)
682 return(unknown_name);
684 return(smb_messages[match].name);
688 /****************************************************************************
689 Helper function for contruct_reply.
690 ****************************************************************************/
692 void construct_reply_common(char *inbuf,char *outbuf)
694 memset(outbuf,'\0',smb_size);
696 set_message(outbuf,0,0,True);
697 CVAL(outbuf,smb_com) = CVAL(inbuf,smb_com);
699 memcpy(outbuf+4,inbuf+4,4);
700 CVAL(outbuf,smb_rcls) = SMB_SUCCESS;
701 CVAL(outbuf,smb_reh) = 0;
702 SCVAL(outbuf,smb_flg, FLAG_REPLY | (CVAL(inbuf,smb_flg) & FLAG_CASELESS_PATHNAMES)); /* bit 7 set
704 SSVAL(outbuf,smb_flg2,FLAGS2_LONG_PATH_COMPONENTS);
705 /* say we support long filenames */
707 SSVAL(outbuf,smb_err,SMB_SUCCESS);
708 SSVAL(outbuf,smb_tid,SVAL(inbuf,smb_tid));
709 SSVAL(outbuf,smb_pid,SVAL(inbuf,smb_pid));
710 SSVAL(outbuf,smb_uid,SVAL(inbuf,smb_uid));
711 SSVAL(outbuf,smb_mid,SVAL(inbuf,smb_mid));
714 /****************************************************************************
715 construct a chained reply and add it to the already made reply
716 **************************************************************************/
717 int chain_reply(char *inbuf,char *outbuf,int size,int bufsize)
719 static char *orig_inbuf;
720 static char *orig_outbuf;
721 int smb_com1, smb_com2 = CVAL(inbuf,smb_vwv0);
722 unsigned smb_off2 = SVAL(inbuf,smb_vwv1);
723 char *inbuf2, *outbuf2;
725 char inbuf_saved[smb_wct];
726 char outbuf_saved[smb_wct];
727 int wct = CVAL(outbuf,smb_wct);
728 int outsize = smb_size + 2*wct + SVAL(outbuf,smb_vwv0+2*wct);
730 /* maybe its not chained */
731 if (smb_com2 == 0xFF) {
732 CVAL(outbuf,smb_vwv0) = 0xFF;
736 if (chain_size == 0) {
737 /* this is the first part of the chain */
739 orig_outbuf = outbuf;
743 * The original Win95 redirector dies on a reply to
744 * a lockingX and read chain unless the chain reply is
745 * 4 byte aligned. JRA.
748 outsize = (outsize + 3) & ~3;
750 /* we need to tell the client where the next part of the reply will be */
751 SSVAL(outbuf,smb_vwv1,smb_offset(outbuf+outsize,outbuf));
752 CVAL(outbuf,smb_vwv0) = smb_com2;
754 /* remember how much the caller added to the chain, only counting stuff
755 after the parameter words */
756 chain_size += outsize - smb_wct;
758 /* work out pointers into the original packets. The
759 headers on these need to be filled in */
760 inbuf2 = orig_inbuf + smb_off2 + 4 - smb_wct;
761 outbuf2 = orig_outbuf + SVAL(outbuf,smb_vwv1) + 4 - smb_wct;
763 /* remember the original command type */
764 smb_com1 = CVAL(orig_inbuf,smb_com);
766 /* save the data which will be overwritten by the new headers */
767 memcpy(inbuf_saved,inbuf2,smb_wct);
768 memcpy(outbuf_saved,outbuf2,smb_wct);
770 /* give the new packet the same header as the last part of the SMB */
771 memmove(inbuf2,inbuf,smb_wct);
773 /* create the in buffer */
774 CVAL(inbuf2,smb_com) = smb_com2;
776 /* create the out buffer */
777 construct_reply_common(inbuf2, outbuf2);
779 DEBUG(3,("Chained message\n"));
782 /* process the request */
783 outsize2 = switch_message(smb_com2,inbuf2,outbuf2,size-chain_size,
786 /* copy the new reply and request headers over the old ones, but
787 preserve the smb_com field */
788 memmove(orig_outbuf,outbuf2,smb_wct);
789 CVAL(orig_outbuf,smb_com) = smb_com1;
791 /* restore the saved data, being careful not to overwrite any
792 data from the reply header */
793 memcpy(inbuf2,inbuf_saved,smb_wct);
795 int ofs = smb_wct - PTR_DIFF(outbuf2,orig_outbuf);
796 if (ofs < 0) ofs = 0;
797 memmove(outbuf2+ofs,outbuf_saved+ofs,smb_wct-ofs);
803 /****************************************************************************
804 Setup the needed select timeout.
805 ****************************************************************************/
807 static int setup_select_timeout(void)
809 int change_notify_timeout = lp_change_notify_timeout() * 1000;
813 * Increase the select timeout back to SMBD_SELECT_TIMEOUT if we
814 * have removed any blocking locks. JRA.
817 select_timeout = blocking_locks_pending() ? SMBD_SELECT_TIMEOUT_WITH_PENDING_LOCKS*1000 :
818 SMBD_SELECT_TIMEOUT*1000;
820 if (change_notifies_pending())
821 select_timeout = MIN(select_timeout, change_notify_timeout);
823 return select_timeout;
826 /****************************************************************************
827 Check if services need reloading.
828 ****************************************************************************/
830 void check_reload(int t)
832 static time_t last_smb_conf_reload_time = 0;
834 if(last_smb_conf_reload_time == 0)
835 last_smb_conf_reload_time = t;
837 if (reload_after_sighup || (t >= last_smb_conf_reload_time+SMBD_RELOAD_CHECK))
839 reload_services(True);
840 reload_after_sighup = False;
841 last_smb_conf_reload_time = t;
845 /****************************************************************************
846 Process any timeout housekeeping. Return False if the caller should exit.
847 ****************************************************************************/
849 static BOOL timeout_processing(int deadtime, int *select_timeout, time_t *last_timeout_processing_time)
851 static time_t last_keepalive_sent_time = 0;
852 static time_t last_idle_closed_check = 0;
855 extern int keepalive;
857 if (smb_read_error == READ_EOF)
859 DEBUG(3,("end of file from client\n"));
863 if (smb_read_error == READ_ERROR)
865 DEBUG(3,("receive_smb error (%s) exiting\n",
870 *last_timeout_processing_time = t = time(NULL);
872 if(last_keepalive_sent_time == 0)
873 last_keepalive_sent_time = t;
875 if(last_idle_closed_check == 0)
876 last_idle_closed_check = t;
878 /* become root again if waiting */
881 /* check if we need to reload services */
884 /* automatic timeout if all connections are closed */
885 if (conn_num_open()==0 && (t - last_idle_closed_check) >= IDLE_CLOSED_TIMEOUT)
887 DEBUG( 2, ( "Closing idle connection\n" ) );
891 last_idle_closed_check = t;
893 if (keepalive && (t - last_keepalive_sent_time)>keepalive)
895 struct cli_state *cli = server_client();
896 if (!send_keepalive(smbd_server_fd())) {
897 DEBUG( 2, ( "Keepalive failed - exiting.\n" ) );
900 /* also send a keepalive to the password server if its still
902 if (cli && cli->initialised)
903 send_keepalive(cli->fd);
904 last_keepalive_sent_time = t;
907 /* check for connection timeouts */
908 allidle = conn_idle_all(t, deadtime);
910 if (allidle && conn_num_open()>0) {
911 DEBUG(2,("Closing idle connection 2.\n"));
915 if(global_machine_password_needs_changing)
917 unsigned char trust_passwd_hash[16];
919 pstring remote_machine_list;
922 * We're in domain level security, and the code that
923 * read the machine password flagged that the machine
924 * password needs changing.
928 * First, open the machine password file with an exclusive lock.
931 if(!trust_password_lock( global_myworkgroup, global_myname, True)) {
932 DEBUG(0,("process: unable to open the machine account password file for \
933 machine %s in domain %s.\n", global_myname, global_myworkgroup ));
937 if(!get_trust_account_password( trust_passwd_hash, &lct)) {
938 DEBUG(0,("process: unable to read the machine account password for \
939 machine %s in domain %s.\n", global_myname, global_myworkgroup ));
940 trust_password_unlock();
945 * Make sure someone else hasn't already done this.
948 if(t < lct + lp_machine_password_timeout()) {
949 trust_password_unlock();
950 global_machine_password_needs_changing = False;
954 pstrcpy(remote_machine_list, lp_passwordserver());
956 change_trust_account_password( global_myworkgroup, remote_machine_list);
957 trust_password_unlock();
958 global_machine_password_needs_changing = False;
962 * Check to see if we have any blocking locks
963 * outstanding on the queue.
965 process_blocking_lock_queue(t);
968 * Check to see if we have any change notifies
969 * outstanding on the queue.
971 process_pending_change_notify_queue(t);
974 * Modify the select timeout depending upon
975 * what we have remaining in our queues.
978 *select_timeout = setup_select_timeout();
983 /****************************************************************************
984 process commands from the client
985 ****************************************************************************/
987 void smbd_process(void)
989 extern int smb_echo_count;
990 time_t last_timeout_processing_time = time(NULL);
991 unsigned int num_smbs = 0;
993 InBuffer = (char *)malloc(BUFFER_SIZE + SAFETY_MARGIN);
994 OutBuffer = (char *)malloc(BUFFER_SIZE + SAFETY_MARGIN);
995 if ((InBuffer == NULL) || (OutBuffer == NULL))
998 InBuffer += SMB_ALIGNMENT;
999 OutBuffer += SMB_ALIGNMENT;
1001 max_recv = MIN(lp_maxxmit(),BUFFER_SIZE);
1003 /* re-initialise the timezone */
1008 int deadtime = lp_deadtime()*60;
1009 BOOL got_smb = False;
1010 int select_timeout = setup_select_timeout();
1013 deadtime = DEFAULT_SMBD_TIMEOUT;
1015 #if USE_READ_PREDICTION
1016 if (lp_readprediction())
1017 do_read_prediction();
1022 /* free up temporary memory */
1025 while(!receive_message_or_smb(InBuffer,BUFFER_SIZE,select_timeout,&got_smb))
1027 if(!timeout_processing( deadtime, &select_timeout, &last_timeout_processing_time))
1029 num_smbs = 0; /* Reset smb counter. */
1034 * Ensure we do timeout processing if the SMB we just got was
1035 * only an echo request. This allows us to set the select
1036 * timeout in 'receive_message_or_smb()' to any value we like
1037 * without worrying that the client will send echo requests
1038 * faster than the select timeout, thus starving out the
1039 * essential processing (change notify, blocking locks) that
1040 * the timeout code does. JRA.
1042 int num_echos = smb_echo_count;
1044 process_smb(InBuffer, OutBuffer);
1046 if(smb_echo_count != num_echos) {
1047 if(!timeout_processing( deadtime, &select_timeout, &last_timeout_processing_time))
1049 num_smbs = 0; /* Reset smb counter. */
1055 * If we are getting smb requests in a constant stream
1056 * with no echos, make sure we attempt timeout processing
1057 * every select_timeout milliseconds - but only check for this
1058 * every 200 smb requests.
1061 if((num_smbs % 200) == 0) {
1062 time_t new_check_time = time(NULL);
1063 if(last_timeout_processing_time - new_check_time >= (select_timeout/1000)) {
1064 if(!timeout_processing( deadtime, &select_timeout, &last_timeout_processing_time))
1066 num_smbs = 0; /* Reset smb counter. */
1067 last_timeout_processing_time = new_check_time; /* Reset time. */
1072 process_local_message(InBuffer, BUFFER_SIZE);