3 Unix SMB/Netbios implementation.
5 process incoming packets - main loop
6 Copyright (C) Andrew Tridgell 1992-1998
8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 2 of the License, or
11 (at your option) any later version.
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with this program; if not, write to the Free Software
20 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
25 extern int DEBUGLEVEL;
27 struct timeval smb_last_time;
29 static char *InBuffer = NULL;
30 char *OutBuffer = NULL;
31 char *last_inbuf = NULL;
34 * Size of data we can send to client. Set
35 * by the client for all protocols above CORE.
36 * Set by us for CORE protocol.
38 int max_send = BUFFER_SIZE;
40 * Size of the data we can receive. Set by us.
41 * Can be modified by the max xmit parameter.
43 int max_recv = BUFFER_SIZE;
45 extern int last_message;
46 extern int global_oplock_break;
47 extern pstring sesssetup_user;
48 extern char *last_inbuf;
49 extern char *InBuffer;
50 extern char *OutBuffer;
51 extern int smb_read_error;
52 extern VOLATILE SIG_ATOMIC_T reload_after_sighup;
53 extern BOOL global_machine_password_needs_changing;
54 extern fstring global_myworkgroup;
55 extern pstring global_myname;
58 /****************************************************************************
59 structure to hold a linked list of queued messages.
61 ****************************************************************************/
67 } pending_message_list;
69 static ubi_slList smb_oplock_queue = { NULL, (ubi_slNodePtr)&smb_oplock_queue, 0};
71 /****************************************************************************
72 Function to push a message onto the tail of a linked list of smb messages ready
74 ****************************************************************************/
76 static BOOL push_message(ubi_slList *list_head, char *buf, int msg_len)
78 pending_message_list *msg = (pending_message_list *)
79 malloc(sizeof(pending_message_list));
83 DEBUG(0,("push_message: malloc fail (1)\n"));
87 msg->msg_buf = (char *)malloc(msg_len);
88 if(msg->msg_buf == NULL)
90 DEBUG(0,("push_message: malloc fail (2)\n"));
95 memcpy(msg->msg_buf, buf, msg_len);
96 msg->msg_len = msg_len;
98 ubi_slAddTail( list_head, msg);
103 /****************************************************************************
104 Function to push a smb message onto a linked list of local smb messages ready
106 ****************************************************************************/
108 BOOL push_oplock_pending_smb_message(char *buf, int msg_len)
110 return push_message(&smb_oplock_queue, buf, msg_len);
113 /****************************************************************************
114 do all async processing in here. This includes UDB oplock messages, kernel
115 oplock messages, change notify events etc.
116 ****************************************************************************/
117 static void async_processing(fd_set *fds, char *buffer, int buffer_len)
119 /* check for oplock messages (both UDP and kernel) */
120 if (receive_local_message(fds, buffer, buffer_len, 0)) {
121 process_local_message(buffer, buffer_len);
124 /* check for async change notify events */
125 process_pending_change_notify_queue(0);
127 /* check for sighup processing */
128 if (reload_after_sighup) {
130 DEBUG(1,("Reloading services after SIGHUP\n"));
131 reload_services(False);
132 reload_after_sighup = False;
135 /* check for any pending internal messages */
139 /****************************************************************************
140 Do a select on an two fd's - with timeout.
142 If a local udp message has been pushed onto the
143 queue (this can only happen during oplock break
144 processing) call async_processing()
146 If a pending smb message has been pushed onto the
147 queue (this can only happen during oplock break
148 processing) return this next.
150 If the first smbfd is ready then read an smb from it.
151 if the second (loopback UDP) fd is ready then read a message
152 from it and setup the buffer header to identify the length
154 Returns False on timeout or error.
157 The timeout is in milli seconds
158 ****************************************************************************/
160 static BOOL receive_message_or_smb(char *buffer, int buffer_len, int timeout)
170 * Check to see if we already have a message on the smb queue.
171 * If so - copy and return it.
173 if(ubi_slCount(&smb_oplock_queue) != 0) {
174 pending_message_list *msg = (pending_message_list *)ubi_slRemHead(&smb_oplock_queue);
175 memcpy(buffer, msg->msg_buf, MIN(buffer_len, msg->msg_len));
177 /* Free the message we just copied. */
178 free((char *)msg->msg_buf);
181 DEBUG(5,("receive_message_or_smb: returning queued smb message.\n"));
187 * Setup the select read fd set.
192 FD_SET(smbd_server_fd(),&fds);
193 maxfd = setup_oplock_select_set(&fds);
195 to.tv_sec = timeout / 1000;
196 to.tv_usec = (timeout % 1000) * 1000;
198 selrtn = sys_select(MAX(maxfd,smbd_server_fd())+1,&fds,timeout>0?&to:NULL);
200 /* if we get EINTR then maybe we have received an oplock
201 signal - treat this as select returning 1. This is ugly, but
202 is the best we can do until the oplock code knows more about
204 if (selrtn == -1 && errno == EINTR) {
205 async_processing(&fds, buffer, buffer_len);
211 /* something is wrong. Maybe the socket is dead? */
212 smb_read_error = READ_ERROR;
216 /* Did we timeout ? */
218 smb_read_error = READ_TIMEOUT;
222 if (!FD_ISSET(smbd_server_fd(),&fds) || selrtn > 1) {
223 async_processing(&fds, buffer, buffer_len);
224 if (!FD_ISSET(smbd_server_fd(),&fds)) goto again;
227 return receive_smb(smbd_server_fd(), buffer, 0);
230 /****************************************************************************
231 Get the next SMB packet, doing the local message processing automatically.
232 ****************************************************************************/
234 BOOL receive_next_smb(char *inbuf, int bufsize, int timeout)
240 ret = receive_message_or_smb(inbuf,bufsize,timeout);
242 got_keepalive = (ret && (CVAL(inbuf,0) == 0x85));
243 } while (ret && got_keepalive);
248 /****************************************************************************
249 We're terminating and have closed all our files/connections etc.
250 If there are any pending local messages we need to respond to them
251 before termination so that other smbds don't think we just died whilst
253 ****************************************************************************/
255 void respond_to_all_remaining_local_messages(void)
261 * Assert we have no exclusive open oplocks.
264 if(get_number_of_exclusive_open_oplocks()) {
265 DEBUG(0,("respond_to_all_remaining_local_messages: PANIC : we have %d exclusive oplocks.\n",
266 get_number_of_exclusive_open_oplocks() ));
271 * Setup the select read fd set.
275 if(!setup_oplock_select_set(&fds))
279 * Keep doing receive_local_message with a 1 ms timeout until
280 * we have no more messages.
282 while(receive_local_message(&fds, buffer, sizeof(buffer), 1)) {
283 /* Deal with oplock break requests from other smbd's. */
284 process_local_message(buffer, sizeof(buffer));
287 (void)setup_oplock_select_set(&fds);
295 These flags determine some of the permissions required to do an operation
297 Note that I don't set NEED_WRITE on some write operations because they
298 are used by some brain-dead clients when printing, and I don't want to
299 force write permissions on print services.
301 #define AS_USER (1<<0)
302 #define NEED_WRITE (1<<1)
303 #define TIME_INIT (1<<2)
304 #define CAN_IPC (1<<3)
305 #define AS_GUEST (1<<5)
306 #define QUEUE_IN_OPLOCK (1<<6)
309 define a list of possible SMB messages and their corresponding
310 functions. Any message that has a NULL function is unimplemented -
311 please feel free to contribute implementations!
313 struct smb_message_struct
317 int (*fn)(connection_struct *conn, char *, char *, int, int);
324 {SMBnegprot,"SMBnegprot",reply_negprot,0},
325 {SMBtcon,"SMBtcon",reply_tcon,0},
326 {SMBtdis,"SMBtdis",reply_tdis,0},
327 {SMBexit,"SMBexit",reply_exit,0},
328 {SMBioctl,"SMBioctl",reply_ioctl,0},
329 {SMBecho,"SMBecho",reply_echo,0},
330 {SMBsesssetupX,"SMBsesssetupX",reply_sesssetup_and_X,0},
331 {SMBtconX,"SMBtconX",reply_tcon_and_X,0},
332 {SMBulogoffX, "SMBulogoffX", reply_ulogoffX, 0}, /* ulogoff doesn't give a valid TID */
333 {SMBgetatr,"SMBgetatr",reply_getatr,AS_USER},
334 {SMBsetatr,"SMBsetatr",reply_setatr,AS_USER | NEED_WRITE},
335 {SMBchkpth,"SMBchkpth",reply_chkpth,AS_USER},
336 {SMBsearch,"SMBsearch",reply_search,AS_USER},
337 {SMBopen,"SMBopen",reply_open,AS_USER | QUEUE_IN_OPLOCK },
339 /* note that SMBmknew and SMBcreate are deliberately overloaded */
340 {SMBcreate,"SMBcreate",reply_mknew,AS_USER},
341 {SMBmknew,"SMBmknew",reply_mknew,AS_USER},
343 {SMBunlink,"SMBunlink",reply_unlink,AS_USER | NEED_WRITE | QUEUE_IN_OPLOCK},
344 {SMBread,"SMBread",reply_read,AS_USER},
345 {SMBwrite,"SMBwrite",reply_write,AS_USER | CAN_IPC },
346 {SMBclose,"SMBclose",reply_close,AS_USER | CAN_IPC },
347 {SMBmkdir,"SMBmkdir",reply_mkdir,AS_USER | NEED_WRITE},
348 {SMBrmdir,"SMBrmdir",reply_rmdir,AS_USER | NEED_WRITE},
349 {SMBdskattr,"SMBdskattr",reply_dskattr,AS_USER},
350 {SMBmv,"SMBmv",reply_mv,AS_USER | NEED_WRITE | QUEUE_IN_OPLOCK},
352 /* this is a Pathworks specific call, allowing the
353 changing of the root path */
354 {pSETDIR,"pSETDIR",reply_setdir,AS_USER},
356 {SMBlseek,"SMBlseek",reply_lseek,AS_USER},
357 {SMBflush,"SMBflush",reply_flush,AS_USER},
358 {SMBctemp,"SMBctemp",reply_ctemp,AS_USER | QUEUE_IN_OPLOCK },
359 {SMBsplopen,"SMBsplopen",reply_printopen,AS_USER | QUEUE_IN_OPLOCK },
360 {SMBsplclose,"SMBsplclose",reply_printclose,AS_USER},
361 {SMBsplretq,"SMBsplretq",reply_printqueue,AS_USER},
362 {SMBsplwr,"SMBsplwr",reply_printwrite,AS_USER},
363 {SMBlock,"SMBlock",reply_lock,AS_USER},
364 {SMBunlock,"SMBunlock",reply_unlock,AS_USER},
366 /* CORE+ PROTOCOL FOLLOWS */
368 {SMBreadbraw,"SMBreadbraw",reply_readbraw,AS_USER},
369 {SMBwritebraw,"SMBwritebraw",reply_writebraw,AS_USER},
370 {SMBwriteclose,"SMBwriteclose",reply_writeclose,AS_USER},
371 {SMBlockread,"SMBlockread",reply_lockread,AS_USER},
372 {SMBwriteunlock,"SMBwriteunlock",reply_writeunlock,AS_USER},
374 /* LANMAN1.0 PROTOCOL FOLLOWS */
376 {SMBreadBmpx,"SMBreadBmpx",reply_readbmpx,AS_USER},
377 {SMBreadBs,"SMBreadBs",NULL,AS_USER},
378 {SMBwriteBmpx,"SMBwriteBmpx",reply_writebmpx,AS_USER},
379 {SMBwriteBs,"SMBwriteBs",reply_writebs,AS_USER},
380 {SMBwritec,"SMBwritec",NULL,AS_USER},
381 {SMBsetattrE,"SMBsetattrE",reply_setattrE,AS_USER | NEED_WRITE },
382 {SMBgetattrE,"SMBgetattrE",reply_getattrE,AS_USER },
383 {SMBtrans,"SMBtrans",reply_trans,AS_USER | CAN_IPC | QUEUE_IN_OPLOCK},
384 {SMBtranss,"SMBtranss",NULL,AS_USER | CAN_IPC},
385 {SMBioctls,"SMBioctls",NULL,AS_USER},
386 {SMBcopy,"SMBcopy",reply_copy,AS_USER | NEED_WRITE | QUEUE_IN_OPLOCK },
387 {SMBmove,"SMBmove",NULL,AS_USER | NEED_WRITE | QUEUE_IN_OPLOCK },
389 {SMBopenX,"SMBopenX",reply_open_and_X,AS_USER | CAN_IPC | QUEUE_IN_OPLOCK },
390 {SMBreadX,"SMBreadX",reply_read_and_X,AS_USER | CAN_IPC },
391 {SMBwriteX,"SMBwriteX",reply_write_and_X,AS_USER | CAN_IPC },
392 {SMBlockingX,"SMBlockingX",reply_lockingX,AS_USER },
394 {SMBffirst,"SMBffirst",reply_search,AS_USER},
395 {SMBfunique,"SMBfunique",reply_search,AS_USER},
396 {SMBfclose,"SMBfclose",reply_fclose,AS_USER},
398 /* LANMAN2.0 PROTOCOL FOLLOWS */
399 {SMBfindnclose, "SMBfindnclose", reply_findnclose, AS_USER},
400 {SMBfindclose, "SMBfindclose", reply_findclose,AS_USER},
401 {SMBtrans2, "SMBtrans2", reply_trans2, AS_USER | QUEUE_IN_OPLOCK | CAN_IPC },
402 {SMBtranss2, "SMBtranss2", reply_transs2, AS_USER},
404 /* NT PROTOCOL FOLLOWS */
405 {SMBntcreateX, "SMBntcreateX", reply_ntcreate_and_X, AS_USER | CAN_IPC | QUEUE_IN_OPLOCK },
406 {SMBnttrans, "SMBnttrans", reply_nttrans, AS_USER | CAN_IPC | QUEUE_IN_OPLOCK},
407 {SMBnttranss, "SMBnttranss", reply_nttranss, AS_USER | CAN_IPC },
408 {SMBntcancel, "SMBntcancel", reply_ntcancel, 0 },
410 /* messaging routines */
411 {SMBsends,"SMBsends",reply_sends,AS_GUEST},
412 {SMBsendstrt,"SMBsendstrt",reply_sendstrt,AS_GUEST},
413 {SMBsendend,"SMBsendend",reply_sendend,AS_GUEST},
414 {SMBsendtxt,"SMBsendtxt",reply_sendtxt,AS_GUEST},
416 /* NON-IMPLEMENTED PARTS OF THE CORE PROTOCOL */
418 {SMBsendb,"SMBsendb",NULL,AS_GUEST},
419 {SMBfwdname,"SMBfwdname",NULL,AS_GUEST},
420 {SMBcancelf,"SMBcancelf",NULL,AS_GUEST},
421 {SMBgetmac,"SMBgetmac",NULL,AS_GUEST}
424 /*******************************************************************
426 ********************************************************************/
427 static void smb_dump(char *name, int type, char *data, ssize_t len)
431 if (DEBUGLEVEL < 50) return;
433 if (len < 4) len = smb_len(data)+4;
434 for (i=1;i<100;i++) {
435 slprintf(fname,sizeof(fname), "/tmp/%s.%d.%s", name, i,
436 type ? "req" : "resp");
437 fd = open(fname, O_WRONLY|O_CREAT|O_EXCL, 0644);
438 if (fd != -1 || errno != EEXIST) break;
441 write(fd, data, len);
443 DEBUG(0,("created %s len %d\n", fname, len));
448 /****************************************************************************
449 do a switch on the message type, and return the response size
450 ****************************************************************************/
451 static int switch_message(int type,char *inbuf,char *outbuf,int size,int bufsize)
453 static pid_t pid= (pid_t)-1;
455 static int num_smb_messages =
456 sizeof(smb_messages) / sizeof(struct smb_message_struct);
458 extern int global_smbpid;
460 if (pid == (pid_t)-1)
466 /* make sure this is an SMB packet */
467 if (strncmp(smb_base(inbuf),"\377SMB",4) != 0)
469 DEBUG(2,("Non-SMB packet of length %d\n",smb_len(inbuf)));
473 for (match=0;match<num_smb_messages;match++)
474 if (smb_messages[match].code == type)
477 /* yuck! this is an interim measure before we get rid of our
478 current inbuf/outbuf system */
479 global_smbpid = SVAL(inbuf,smb_pid);
481 if (match == num_smb_messages)
483 DEBUG(0,("Unknown message type %d!\n",type));
484 smb_dump("Unknown", 1, inbuf, size);
485 outsize = reply_unknown(inbuf,outbuf);
489 DEBUG(3,("switch message %s (pid %d)\n",smb_messages[match].name,(int)pid));
491 smb_dump(smb_messages[match].name, 1, inbuf, size);
492 if(global_oplock_break)
494 int flags = smb_messages[match].flags;
496 if(flags & QUEUE_IN_OPLOCK)
499 * Queue this message as we are the process of an oplock break.
502 DEBUG( 2, ( "switch_message: queueing message due to being in " ) );
503 DEBUGADD( 2, ( "oplock break state.\n" ) );
505 push_oplock_pending_smb_message( inbuf, size );
509 if (smb_messages[match].fn)
511 int flags = smb_messages[match].flags;
512 static uint16 last_session_tag = UID_FIELD_INVALID;
513 /* In share mode security we must ignore the vuid. */
514 uint16 session_tag = (lp_security() == SEC_SHARE) ? UID_FIELD_INVALID : SVAL(inbuf,smb_uid);
515 connection_struct *conn = conn_find(SVAL(inbuf,smb_tid));
518 /* Ensure this value is replaced in the incoming packet. */
519 SSVAL(inbuf,smb_uid,session_tag);
522 * Ensure the correct username is in sesssetup_user.
523 * This is a really ugly bugfix for problems with
524 * multiple session_setup_and_X's being done and
525 * allowing %U and %G substitutions to work correctly.
526 * There is a reason this code is done here, don't
527 * move it unless you know what you're doing... :-).
530 if (session_tag != last_session_tag) {
531 user_struct *vuser = NULL;
533 last_session_tag = session_tag;
534 if(session_tag != UID_FIELD_INVALID)
535 vuser = get_valid_user_struct(session_tag);
537 pstrcpy( sesssetup_user, vuser->user.smb_name);
540 /* does this protocol need to be run as root? */
541 if (!(flags & AS_USER))
544 /* does this protocol need to be run as the connected user? */
545 if ((flags & AS_USER) && !become_user(conn,session_tag)) {
546 if (flags & AS_GUEST)
549 return(ERROR(ERRSRV,ERRaccess));
551 /* this code is to work around a bug is MS client 3 without
552 introducing a security hole - it needs to be able to do
553 print queue checks as guest if it isn't logged in properly */
557 /* does it need write permission? */
558 if ((flags & NEED_WRITE) && !CAN_WRITE(conn))
559 return(ERROR(ERRSRV,ERRaccess));
561 /* ipc services are limited */
562 if (IS_IPC(conn) && (flags & AS_USER) && !(flags & CAN_IPC)) {
563 return(ERROR(ERRSRV,ERRaccess));
566 /* load service specific parameters */
567 if (conn && !become_service(conn,(flags & AS_USER)?True:False)) {
568 return(ERROR(ERRSRV,ERRaccess));
571 /* does this protocol need to be run as guest? */
572 if ((flags & AS_GUEST) &&
574 !check_access(smbd_server_fd(), lp_hostsallow(-1), lp_hostsdeny(-1)))) {
575 return(ERROR(ERRSRV,ERRaccess));
580 outsize = smb_messages[match].fn(conn, inbuf,outbuf,size,bufsize);
584 outsize = reply_unknown(inbuf,outbuf);
588 smb_dump(smb_messages[match].name, 0, outbuf, outsize);
594 /****************************************************************************
595 construct a reply to the incoming packet
596 ****************************************************************************/
597 static int construct_reply(char *inbuf,char *outbuf,int size,int bufsize)
599 int type = CVAL(inbuf,smb_com);
601 int msg_type = CVAL(inbuf,0);
603 GetTimeOfDay(&smb_last_time);
610 return(reply_special(inbuf,outbuf));
612 construct_reply_common(inbuf, outbuf);
614 outsize = switch_message(type,inbuf,outbuf,size,bufsize);
616 outsize += chain_size;
619 smb_setlen(outbuf,outsize - 4);
624 /****************************************************************************
625 process an smb from the client - split out from the process() code so
626 it can be used by the oplock break code.
627 ****************************************************************************/
628 void process_smb(char *inbuf, char *outbuf)
631 extern BOOL sslEnabled; /* don't use function for performance reasons */
632 static int sslConnected = 0;
633 #endif /* WITH_SSL */
634 static int trans_num;
635 int msg_type = CVAL(inbuf,0);
636 int32 len = smb_len(inbuf);
640 profile_p->smb_count++;
643 if (trans_num == 0) {
644 /* on the first packet, check the global hosts allow/ hosts
645 deny parameters before doing any parsing of the packet
646 passed to us by the client. This prevents attacks on our
647 parsing code from hosts not in the hosts allow list */
648 if (!check_access(smbd_server_fd(), lp_hostsallow(-1), lp_hostsdeny(-1))) {
649 /* send a negative session response "not listining on calling
651 static unsigned char buf[5] = {0x83, 0, 0, 1, 0x81};
652 DEBUG( 1, ( "Connection denied from %s\n",
654 send_smb(smbd_server_fd(),(char *)buf);
655 exit_server("connection denied");
659 DEBUG( 6, ( "got message type 0x%x of len 0x%x\n", msg_type, len ) );
660 DEBUG( 3, ( "Transaction %d of length %d\n", trans_num, nread ) );
663 if(sslEnabled && !sslConnected){
664 sslConnected = sslutil_negotiate_ssl(smbd_server_fd(), msg_type);
665 if(sslConnected < 0){ /* an error occured */
666 exit_server("SSL negotiation failed");
667 }else if(sslConnected){
672 #endif /* WITH_SSL */
676 else if(msg_type == 0x85)
677 return; /* Keepalive packet. */
679 nread = construct_reply(inbuf,outbuf,nread,max_send);
683 if (CVAL(outbuf,0) == 0)
686 if (nread != smb_len(outbuf) + 4)
688 DEBUG(0,("ERROR: Invalid message response size! %d %d\n",
689 nread, smb_len(outbuf)));
692 send_smb(smbd_server_fd(),outbuf);
699 /****************************************************************************
700 return a string containing the function name of a SMB command
701 ****************************************************************************/
702 char *smb_fn_name(int type)
704 static char *unknown_name = "SMBunknown";
705 static int num_smb_messages =
706 sizeof(smb_messages) / sizeof(struct smb_message_struct);
709 for (match=0;match<num_smb_messages;match++)
710 if (smb_messages[match].code == type)
713 if (match == num_smb_messages)
714 return(unknown_name);
716 return(smb_messages[match].name);
720 /****************************************************************************
721 Helper function for contruct_reply.
722 ****************************************************************************/
724 void construct_reply_common(char *inbuf,char *outbuf)
726 memset(outbuf,'\0',smb_size);
728 set_message(outbuf,0,0,True);
729 CVAL(outbuf,smb_com) = CVAL(inbuf,smb_com);
731 memcpy(outbuf+4,inbuf+4,4);
732 CVAL(outbuf,smb_rcls) = SMB_SUCCESS;
733 CVAL(outbuf,smb_reh) = 0;
734 SCVAL(outbuf,smb_flg, FLAG_REPLY | (CVAL(inbuf,smb_flg) & FLAG_CASELESS_PATHNAMES)); /* bit 7 set
736 SSVAL(outbuf,smb_flg2,FLAGS2_LONG_PATH_COMPONENTS);
737 /* say we support long filenames */
739 SSVAL(outbuf,smb_err,SMB_SUCCESS);
740 SSVAL(outbuf,smb_tid,SVAL(inbuf,smb_tid));
741 SSVAL(outbuf,smb_pid,SVAL(inbuf,smb_pid));
742 SSVAL(outbuf,smb_uid,SVAL(inbuf,smb_uid));
743 SSVAL(outbuf,smb_mid,SVAL(inbuf,smb_mid));
746 /****************************************************************************
747 construct a chained reply and add it to the already made reply
748 **************************************************************************/
749 int chain_reply(char *inbuf,char *outbuf,int size,int bufsize)
751 static char *orig_inbuf;
752 static char *orig_outbuf;
753 int smb_com1, smb_com2 = CVAL(inbuf,smb_vwv0);
754 unsigned smb_off2 = SVAL(inbuf,smb_vwv1);
755 char *inbuf2, *outbuf2;
757 char inbuf_saved[smb_wct];
758 char outbuf_saved[smb_wct];
759 int wct = CVAL(outbuf,smb_wct);
760 int outsize = smb_size + 2*wct + SVAL(outbuf,smb_vwv0+2*wct);
762 /* maybe its not chained */
763 if (smb_com2 == 0xFF) {
764 CVAL(outbuf,smb_vwv0) = 0xFF;
768 if (chain_size == 0) {
769 /* this is the first part of the chain */
771 orig_outbuf = outbuf;
775 * The original Win95 redirector dies on a reply to
776 * a lockingX and read chain unless the chain reply is
777 * 4 byte aligned. JRA.
780 outsize = (outsize + 3) & ~3;
782 /* we need to tell the client where the next part of the reply will be */
783 SSVAL(outbuf,smb_vwv1,smb_offset(outbuf+outsize,outbuf));
784 CVAL(outbuf,smb_vwv0) = smb_com2;
786 /* remember how much the caller added to the chain, only counting stuff
787 after the parameter words */
788 chain_size += outsize - smb_wct;
790 /* work out pointers into the original packets. The
791 headers on these need to be filled in */
792 inbuf2 = orig_inbuf + smb_off2 + 4 - smb_wct;
793 outbuf2 = orig_outbuf + SVAL(outbuf,smb_vwv1) + 4 - smb_wct;
795 /* remember the original command type */
796 smb_com1 = CVAL(orig_inbuf,smb_com);
798 /* save the data which will be overwritten by the new headers */
799 memcpy(inbuf_saved,inbuf2,smb_wct);
800 memcpy(outbuf_saved,outbuf2,smb_wct);
802 /* give the new packet the same header as the last part of the SMB */
803 memmove(inbuf2,inbuf,smb_wct);
805 /* create the in buffer */
806 CVAL(inbuf2,smb_com) = smb_com2;
808 /* create the out buffer */
809 construct_reply_common(inbuf2, outbuf2);
811 DEBUG(3,("Chained message\n"));
814 /* process the request */
815 outsize2 = switch_message(smb_com2,inbuf2,outbuf2,size-chain_size,
818 /* copy the new reply and request headers over the old ones, but
819 preserve the smb_com field */
820 memmove(orig_outbuf,outbuf2,smb_wct);
821 CVAL(orig_outbuf,smb_com) = smb_com1;
823 /* restore the saved data, being careful not to overwrite any
824 data from the reply header */
825 memcpy(inbuf2,inbuf_saved,smb_wct);
827 int ofs = smb_wct - PTR_DIFF(outbuf2,orig_outbuf);
828 if (ofs < 0) ofs = 0;
829 memmove(outbuf2+ofs,outbuf_saved+ofs,smb_wct-ofs);
835 /****************************************************************************
836 Setup the needed select timeout.
837 ****************************************************************************/
839 static int setup_select_timeout(void)
845 * Increase the select timeout back to SMBD_SELECT_TIMEOUT if we
846 * have removed any blocking locks. JRA.
849 select_timeout = blocking_locks_pending() ? SMBD_SELECT_TIMEOUT_WITH_PENDING_LOCKS*1000 :
850 SMBD_SELECT_TIMEOUT*1000;
852 t = change_notify_timeout();
853 if (t != -1) select_timeout = MIN(select_timeout, t*1000);
855 return select_timeout;
858 /****************************************************************************
859 Check if services need reloading.
860 ****************************************************************************/
862 void check_reload(int t)
864 static time_t last_smb_conf_reload_time = 0;
866 if(last_smb_conf_reload_time == 0)
867 last_smb_conf_reload_time = t;
869 if (reload_after_sighup || (t >= last_smb_conf_reload_time+SMBD_RELOAD_CHECK))
871 reload_services(True);
872 reload_after_sighup = False;
873 last_smb_conf_reload_time = t;
877 /****************************************************************************
878 Process any timeout housekeeping. Return False if the caller should exit.
879 ****************************************************************************/
881 static BOOL timeout_processing(int deadtime, int *select_timeout, time_t *last_timeout_processing_time)
883 static time_t last_keepalive_sent_time = 0;
884 static time_t last_idle_closed_check = 0;
887 extern int keepalive;
889 if (smb_read_error == READ_EOF)
891 DEBUG(3,("end of file from client\n"));
895 if (smb_read_error == READ_ERROR)
897 DEBUG(3,("receive_smb error (%s) exiting\n",
902 *last_timeout_processing_time = t = time(NULL);
904 if(last_keepalive_sent_time == 0)
905 last_keepalive_sent_time = t;
907 if(last_idle_closed_check == 0)
908 last_idle_closed_check = t;
910 /* become root again if waiting */
913 /* check if we need to reload services */
916 /* automatic timeout if all connections are closed */
917 if (conn_num_open()==0 && (t - last_idle_closed_check) >= IDLE_CLOSED_TIMEOUT)
919 DEBUG( 2, ( "Closing idle connection\n" ) );
923 last_idle_closed_check = t;
925 if (keepalive && (t - last_keepalive_sent_time)>keepalive)
927 struct cli_state *cli = server_client();
928 if (!send_keepalive(smbd_server_fd())) {
929 DEBUG( 2, ( "Keepalive failed - exiting.\n" ) );
932 /* also send a keepalive to the password server if its still
934 if (cli && cli->initialised)
935 send_keepalive(cli->fd);
936 last_keepalive_sent_time = t;
939 /* check for connection timeouts */
940 allidle = conn_idle_all(t, deadtime);
942 if (allidle && conn_num_open()>0) {
943 DEBUG(2,("Closing idle connection 2.\n"));
947 if(global_machine_password_needs_changing)
949 unsigned char trust_passwd_hash[16];
951 pstring remote_machine_list;
954 * We're in domain level security, and the code that
955 * read the machine password flagged that the machine
956 * password needs changing.
960 * First, open the machine password file with an exclusive lock.
963 if(!secrets_fetch_trust_account_password(global_myworkgroup, trust_passwd_hash, &lct)) {
964 DEBUG(0,("process: unable to read the machine account password for \
965 machine %s in domain %s.\n", global_myname, global_myworkgroup ));
970 * Make sure someone else hasn't already done this.
973 if(t < lct + lp_machine_password_timeout()) {
974 global_machine_password_needs_changing = False;
978 pstrcpy(remote_machine_list, lp_passwordserver());
980 change_trust_account_password( global_myworkgroup, remote_machine_list);
981 global_machine_password_needs_changing = False;
985 * Check to see if we have any blocking locks
986 * outstanding on the queue.
988 process_blocking_lock_queue(t);
991 * Check to see if we have any change notifies
992 * outstanding on the queue.
994 process_pending_change_notify_queue(t);
997 * Now we are root, check if the log files need pruning.
999 if(need_to_check_log_size())
1003 * Modify the select timeout depending upon
1004 * what we have remaining in our queues.
1007 *select_timeout = setup_select_timeout();
1012 /****************************************************************************
1013 process commands from the client
1014 ****************************************************************************/
1016 void smbd_process(void)
1018 extern int smb_echo_count;
1019 time_t last_timeout_processing_time = time(NULL);
1020 unsigned int num_smbs = 0;
1022 InBuffer = (char *)malloc(BUFFER_SIZE + SAFETY_MARGIN);
1023 OutBuffer = (char *)malloc(BUFFER_SIZE + SAFETY_MARGIN);
1024 if ((InBuffer == NULL) || (OutBuffer == NULL))
1027 InBuffer += SMB_ALIGNMENT;
1028 OutBuffer += SMB_ALIGNMENT;
1030 max_recv = MIN(lp_maxxmit(),BUFFER_SIZE);
1032 /* re-initialise the timezone */
1036 int deadtime = lp_deadtime()*60;
1037 int select_timeout = setup_select_timeout();
1041 deadtime = DEFAULT_SMBD_TIMEOUT;
1045 /* free up temporary memory */
1047 parse_talloc_free();
1049 while (!receive_message_or_smb(InBuffer,BUFFER_SIZE,select_timeout)) {
1050 if(!timeout_processing( deadtime, &select_timeout, &last_timeout_processing_time))
1052 num_smbs = 0; /* Reset smb counter. */
1056 * Ensure we do timeout processing if the SMB we just got was
1057 * only an echo request. This allows us to set the select
1058 * timeout in 'receive_message_or_smb()' to any value we like
1059 * without worrying that the client will send echo requests
1060 * faster than the select timeout, thus starving out the
1061 * essential processing (change notify, blocking locks) that
1062 * the timeout code does. JRA.
1064 num_echos = smb_echo_count;
1066 process_smb(InBuffer, OutBuffer);
1068 if (smb_echo_count != num_echos) {
1069 if(!timeout_processing( deadtime, &select_timeout, &last_timeout_processing_time))
1071 num_smbs = 0; /* Reset smb counter. */
1077 * If we are getting smb requests in a constant stream
1078 * with no echos, make sure we attempt timeout processing
1079 * every select_timeout milliseconds - but only check for this
1080 * every 200 smb requests.
1083 if ((num_smbs % 200) == 0) {
1084 time_t new_check_time = time(NULL);
1085 if(last_timeout_processing_time - new_check_time >= (select_timeout/1000)) {
1086 if(!timeout_processing( deadtime, &select_timeout, &last_timeout_processing_time))
1088 num_smbs = 0; /* Reset smb counter. */
1089 last_timeout_processing_time = new_check_time; /* Reset time. */