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.
23 #include "rpc_client.h"
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 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
;
495 key
.vuid
= session_tag
;
497 last_session_tag
= session_tag
;
498 if(session_tag
!= UID_FIELD_INVALID
)
499 vuser
= get_valid_user_struct(&key
);
502 pstrcpy( sesssetup_user
, vuser
->requested_name
);
503 vuid_free_user_struct(vuser
);
507 /* does this protocol need to be run as root? */
508 if (!(flags
& AS_USER
))
511 /* does this protocol need to be run as the connected user? */
512 if ((flags
& AS_USER
) && !become_user(conn
,session_tag
)) {
513 if (flags
& AS_GUEST
)
516 return(ERROR(ERRSRV
,ERRaccess
));
518 /* this code is to work around a bug is MS client 3 without
519 introducing a security hole - it needs to be able to do
520 print queue checks as guest if it isn't logged in properly */
524 /* does it need write permission? */
525 if ((flags
& NEED_WRITE
) && !CAN_WRITE(conn
))
526 return(ERROR(ERRSRV
,ERRaccess
));
528 /* ipc services are limited */
529 if (IS_IPC(conn
) && (flags
& AS_USER
) && !(flags
& CAN_IPC
)) {
530 return(ERROR(ERRSRV
,ERRaccess
));
533 /* load service specific parameters */
535 !become_service(conn
,(flags
& AS_USER
)?True
:False
)) {
536 return(ERROR(ERRSRV
,ERRaccess
));
539 /* does this protocol need to be run as guest? */
540 if ((flags
& AS_GUEST
) &&
542 !check_access(smbd_server_fd(), lp_hostsallow(-1), lp_hostsdeny(-1)))) {
543 return(ERROR(ERRSRV
,ERRaccess
));
548 outsize
= smb_messages
[match
].fn(conn
, inbuf
,outbuf
,size
,bufsize
);
552 outsize
= reply_unknown(inbuf
,outbuf
);
560 /****************************************************************************
561 construct a reply to the incoming packet
562 ****************************************************************************/
563 static int construct_reply(char *inbuf
,char *outbuf
,int size
,int bufsize
)
565 int type
= CVAL(inbuf
,smb_com
);
567 int msg_type
= CVAL(inbuf
,0);
569 GetTimeOfDay(&smb_last_time
);
576 return(reply_special(inbuf
,outbuf
));
578 construct_reply_common(inbuf
, outbuf
);
580 outsize
= switch_message(type
,inbuf
,outbuf
,size
,bufsize
);
582 outsize
+= chain_size
;
585 smb_setlen(outbuf
,outsize
- 4);
590 /****************************************************************************
591 process an smb from the client - split out from the process() code so
592 it can be used by the oplock break code.
593 ****************************************************************************/
594 void process_smb(char *inbuf
, char *outbuf
)
597 extern BOOL sslEnabled
; /* don't use function for performance reasons */
598 static int sslConnected
= 0;
599 #endif /* WITH_SSL */
600 static int trans_num
;
601 int msg_type
= CVAL(inbuf
,0);
602 int32 len
= smb_len(inbuf
);
606 profile_p
->smb_count
++;
609 if (trans_num
== 0) {
610 /* on the first packet, check the global hosts allow/ hosts
611 deny parameters before doing any parsing of the packet
612 passed to us by the client. This prevents attacks on our
613 parsing code from hosts not in the hosts allow list */
614 if (!check_access(smbd_server_fd(), lp_hostsallow(-1), lp_hostsdeny(-1))) {
615 /* send a negative session response "not listining on calling
617 static unsigned char buf
[5] = {0x83, 0, 0, 1, 0x81};
618 DEBUG( 1, ( "Connection denied from %s\n",
620 send_smb(smbd_server_fd(),(char *)buf
);
621 exit_server("connection denied");
625 DEBUG( 6, ( "got message type 0x%x of len 0x%x\n", msg_type
, len
) );
626 DEBUG( 3, ( "Transaction %d of length %d\n", trans_num
, nread
) );
629 if(sslEnabled
&& !sslConnected
){
630 sslConnected
= sslutil_negotiate_ssl(smbd_server_fd(), msg_type
);
631 if(sslConnected
< 0){ /* an error occured */
632 exit_server("SSL negotiation failed");
633 }else if(sslConnected
){
638 #endif /* WITH_SSL */
642 else if(msg_type
== 0x85)
643 return; /* Keepalive packet. */
645 nread
= construct_reply(inbuf
,outbuf
,nread
,max_send
);
649 if (CVAL(outbuf
,0) == 0)
652 if (nread
!= smb_len(outbuf
) + 4)
654 DEBUG(0,("ERROR: Invalid message response size! %d %d\n",
655 nread
, smb_len(outbuf
)));
658 send_smb(smbd_server_fd(),outbuf
);
665 /****************************************************************************
666 return a string containing the function name of a SMB command
667 ****************************************************************************/
668 char *smb_fn_name(int type
)
670 static char *unknown_name
= "SMBunknown";
671 static int num_smb_messages
=
672 sizeof(smb_messages
) / sizeof(struct smb_message_struct
);
675 for (match
=0;match
<num_smb_messages
;match
++)
676 if (smb_messages
[match
].code
== type
)
679 if (match
== num_smb_messages
)
680 return(unknown_name
);
682 return(smb_messages
[match
].name
);
686 /****************************************************************************
687 Helper function for contruct_reply.
688 ****************************************************************************/
690 void construct_reply_common(char *inbuf
,char *outbuf
)
692 memset(outbuf
,'\0',smb_size
);
694 set_message(outbuf
,0,0,True
);
695 CVAL(outbuf
,smb_com
) = CVAL(inbuf
,smb_com
);
697 memcpy(outbuf
+4,inbuf
+4,4);
698 CVAL(outbuf
,smb_rcls
) = SMB_SUCCESS
;
699 CVAL(outbuf
,smb_reh
) = 0;
700 SCVAL(outbuf
,smb_flg
, FLAG_REPLY
| (CVAL(inbuf
,smb_flg
) & FLAG_CASELESS_PATHNAMES
)); /* bit 7 set
702 SSVAL(outbuf
,smb_flg2
,FLAGS2_LONG_PATH_COMPONENTS
);
703 /* say we support long filenames */
705 SSVAL(outbuf
,smb_err
,SMB_SUCCESS
);
706 SSVAL(outbuf
,smb_tid
,SVAL(inbuf
,smb_tid
));
707 SSVAL(outbuf
,smb_pid
,SVAL(inbuf
,smb_pid
));
708 SSVAL(outbuf
,smb_uid
,SVAL(inbuf
,smb_uid
));
709 SSVAL(outbuf
,smb_mid
,SVAL(inbuf
,smb_mid
));
712 /****************************************************************************
713 construct a chained reply and add it to the already made reply
714 **************************************************************************/
715 int chain_reply(char *inbuf
,char *outbuf
,int size
,int bufsize
)
717 static char *orig_inbuf
;
718 static char *orig_outbuf
;
719 int smb_com1
, smb_com2
= CVAL(inbuf
,smb_vwv0
);
720 unsigned smb_off2
= SVAL(inbuf
,smb_vwv1
);
721 char *inbuf2
, *outbuf2
;
723 char inbuf_saved
[smb_wct
];
724 char outbuf_saved
[smb_wct
];
725 int wct
= CVAL(outbuf
,smb_wct
);
726 int outsize
= smb_size
+ 2*wct
+ SVAL(outbuf
,smb_vwv0
+2*wct
);
728 /* maybe its not chained */
729 if (smb_com2
== 0xFF) {
730 CVAL(outbuf
,smb_vwv0
) = 0xFF;
734 if (chain_size
== 0) {
735 /* this is the first part of the chain */
737 orig_outbuf
= outbuf
;
741 * The original Win95 redirector dies on a reply to
742 * a lockingX and read chain unless the chain reply is
743 * 4 byte aligned. JRA.
746 outsize
= (outsize
+ 3) & ~3;
748 /* we need to tell the client where the next part of the reply will be */
749 SSVAL(outbuf
,smb_vwv1
,smb_offset(outbuf
+outsize
,outbuf
));
750 CVAL(outbuf
,smb_vwv0
) = smb_com2
;
752 /* remember how much the caller added to the chain, only counting stuff
753 after the parameter words */
754 chain_size
+= outsize
- smb_wct
;
756 /* work out pointers into the original packets. The
757 headers on these need to be filled in */
758 inbuf2
= orig_inbuf
+ smb_off2
+ 4 - smb_wct
;
759 outbuf2
= orig_outbuf
+ SVAL(outbuf
,smb_vwv1
) + 4 - smb_wct
;
761 /* remember the original command type */
762 smb_com1
= CVAL(orig_inbuf
,smb_com
);
764 /* save the data which will be overwritten by the new headers */
765 memcpy(inbuf_saved
,inbuf2
,smb_wct
);
766 memcpy(outbuf_saved
,outbuf2
,smb_wct
);
768 /* give the new packet the same header as the last part of the SMB */
769 memmove(inbuf2
,inbuf
,smb_wct
);
771 /* create the in buffer */
772 CVAL(inbuf2
,smb_com
) = smb_com2
;
774 /* create the out buffer */
775 construct_reply_common(inbuf2
, outbuf2
);
777 DEBUG(3,("Chained message\n"));
780 /* process the request */
781 outsize2
= switch_message(smb_com2
,inbuf2
,outbuf2
,size
-chain_size
,
784 /* copy the new reply and request headers over the old ones, but
785 preserve the smb_com field */
786 memmove(orig_outbuf
,outbuf2
,smb_wct
);
787 CVAL(orig_outbuf
,smb_com
) = smb_com1
;
789 /* restore the saved data, being careful not to overwrite any
790 data from the reply header */
791 memcpy(inbuf2
,inbuf_saved
,smb_wct
);
793 int ofs
= smb_wct
- PTR_DIFF(outbuf2
,orig_outbuf
);
794 if (ofs
< 0) ofs
= 0;
795 memmove(outbuf2
+ofs
,outbuf_saved
+ofs
,smb_wct
-ofs
);
801 /****************************************************************************
802 Setup the needed select timeout.
803 ****************************************************************************/
805 static int setup_select_timeout(void)
807 int change_notify_timeout
= lp_change_notify_timeout() * 1000;
811 * Increase the select timeout back to SMBD_SELECT_TIMEOUT if we
812 * have removed any blocking locks. JRA.
815 select_timeout
= blocking_locks_pending() ? SMBD_SELECT_TIMEOUT_WITH_PENDING_LOCKS
*1000 :
816 SMBD_SELECT_TIMEOUT
*1000;
818 if (change_notifies_pending())
819 select_timeout
= MIN(select_timeout
, change_notify_timeout
);
821 return select_timeout
;
824 /****************************************************************************
825 Check if services need reloading.
826 ****************************************************************************/
828 void check_reload(int t
)
830 static time_t last_smb_conf_reload_time
= 0;
832 if(last_smb_conf_reload_time
== 0)
833 last_smb_conf_reload_time
= t
;
835 if (reload_after_sighup
|| (t
>= last_smb_conf_reload_time
+SMBD_RELOAD_CHECK
))
837 reload_services(True
);
838 reload_after_sighup
= False
;
839 last_smb_conf_reload_time
= t
;
843 /****************************************************************************
844 Process any timeout housekeeping. Return False if the caller should exit.
845 ****************************************************************************/
847 static BOOL
timeout_processing(int deadtime
, int *select_timeout
, time_t *last_timeout_processing_time
)
849 static time_t last_keepalive_sent_time
= 0;
850 static time_t last_idle_closed_check
= 0;
853 extern int keepalive
;
855 if (smb_read_error
== READ_EOF
)
857 DEBUG(3,("end of file from client\n"));
861 if (smb_read_error
== READ_ERROR
)
863 DEBUG(3,("receive_smb error (%s) exiting\n",
868 *last_timeout_processing_time
= t
= time(NULL
);
870 if(last_keepalive_sent_time
== 0)
871 last_keepalive_sent_time
= t
;
873 if(last_idle_closed_check
== 0)
874 last_idle_closed_check
= t
;
876 /* become root again if waiting */
879 /* check if we need to reload services */
882 /* automatic timeout if all connections are closed */
883 if (conn_num_open()==0 && (t
- last_idle_closed_check
) >= IDLE_CLOSED_TIMEOUT
)
885 DEBUG( 2, ( "Closing idle connection\n" ) );
889 last_idle_closed_check
= t
;
891 if (keepalive
&& (t
- last_keepalive_sent_time
)>keepalive
)
893 if (!send_keepalive(smbd_server_fd())) {
894 DEBUG( 2, ( "Keepalive failed - exiting.\n" ) );
897 last_keepalive_sent_time
= t
;
900 /* check for connection timeouts */
901 allidle
= conn_idle_all(t
, deadtime
);
903 if (allidle
&& conn_num_open()>0) {
904 DEBUG(2,("Closing idle connection 2.\n"));
909 * Check to see if we have any blocking locks
910 * outstanding on the queue.
912 process_blocking_lock_queue(t
);
915 * Check to see if we have any change notifies
916 * outstanding on the queue.
918 process_pending_change_notify_queue(t
);
921 * Now we are root, check if the log files need pruning.
923 if(need_to_check_log_size())
927 * Modify the select timeout depending upon
928 * what we have remaining in our queues.
931 *select_timeout
= setup_select_timeout();
936 /****************************************************************************
937 process commands from the client
938 ****************************************************************************/
940 void smbd_process(void)
942 extern int smb_echo_count
;
943 time_t last_timeout_processing_time
= time(NULL
);
944 unsigned int num_smbs
= 0;
946 InBuffer
= (char *)malloc(BUFFER_SIZE
+ SAFETY_MARGIN
);
947 OutBuffer
= (char *)malloc(BUFFER_SIZE
+ SAFETY_MARGIN
);
948 if ((InBuffer
== NULL
) || (OutBuffer
== NULL
))
951 InBuffer
+= SMB_ALIGNMENT
;
952 OutBuffer
+= SMB_ALIGNMENT
;
954 max_recv
= MIN(lp_maxxmit(),BUFFER_SIZE
);
956 /* re-initialise the timezone */
961 int deadtime
= lp_deadtime()*60;
962 BOOL got_smb
= False
;
963 int select_timeout
= setup_select_timeout();
966 deadtime
= DEFAULT_SMBD_TIMEOUT
;
968 #if USE_READ_PREDICTION
969 if (lp_readprediction())
970 do_read_prediction();
975 /* free up temporary memory */
978 while(!receive_message_or_smb(InBuffer
,BUFFER_SIZE
,select_timeout
,&got_smb
))
980 if(!timeout_processing( deadtime
, &select_timeout
, &last_timeout_processing_time
))
982 num_smbs
= 0; /* Reset smb counter. */
987 * Ensure we do timeout processing if the SMB we just got was
988 * only an echo request. This allows us to set the select
989 * timeout in 'receive_message_or_smb()' to any value we like
990 * without worrying that the client will send echo requests
991 * faster than the select timeout, thus starving out the
992 * essential processing (change notify, blocking locks) that
993 * the timeout code does. JRA.
995 int num_echos
= smb_echo_count
;
997 process_smb(InBuffer
, OutBuffer
);
999 if(smb_echo_count
!= num_echos
) {
1000 if(!timeout_processing( deadtime
, &select_timeout
, &last_timeout_processing_time
))
1002 num_smbs
= 0; /* Reset smb counter. */
1008 * If we are getting smb requests in a constant stream
1009 * with no echos, make sure we attempt timeout processing
1010 * every select_timeout milliseconds - but only check for this
1011 * every 200 smb requests.
1014 if((num_smbs
% 200) == 0) {
1015 time_t new_check_time
= time(NULL
);
1016 if(last_timeout_processing_time
- new_check_time
>= (select_timeout
/1000)) {
1017 if(!timeout_processing( deadtime
, &select_timeout
, &last_timeout_processing_time
))
1019 num_smbs
= 0; /* Reset smb counter. */
1020 last_timeout_processing_time
= new_check_time
; /* Reset time. */
1025 process_local_message(InBuffer
, BUFFER_SIZE
);