2 Unix SMB/CIFS implementation.
3 client file read/write routines
4 Copyright (C) Andrew Tridgell 1994-1998
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2 of the License, or
9 (at your option) any later version.
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with this program; if not, write to the Free Software
18 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
25 /****************************************************************************
26 Issue a single SMBread and don't wait for a reply.
27 ****************************************************************************/
29 static BOOL
cli_issue_read(struct cli_state
*cli
, int fnum
, off_t offset
,
32 BOOL bigoffset
= False
;
34 memset(cli
->outbuf
,'\0',smb_size
);
35 memset(cli
->inbuf
,'\0',smb_size
);
37 if ((SMB_BIG_UINT
)offset
>> 32)
40 set_message(cli
->outbuf
,bigoffset
? 12 : 10,0,True
);
42 SCVAL(cli
->outbuf
,smb_com
,SMBreadX
);
43 SSVAL(cli
->outbuf
,smb_tid
,cli
->cnum
);
44 cli_setup_packet(cli
);
46 SCVAL(cli
->outbuf
,smb_vwv0
,0xFF);
47 SSVAL(cli
->outbuf
,smb_vwv2
,fnum
);
48 SIVAL(cli
->outbuf
,smb_vwv3
,offset
);
49 SSVAL(cli
->outbuf
,smb_vwv5
,size
);
50 SSVAL(cli
->outbuf
,smb_vwv6
,size
);
51 SSVAL(cli
->outbuf
,smb_mid
,cli
->mid
+ i
);
54 SIVAL(cli
->outbuf
,smb_vwv10
,(offset
>>32) & 0xffffffff);
56 return cli_send_smb(cli
);
59 /****************************************************************************
60 Read size bytes at offset offset using SMBreadX.
61 ****************************************************************************/
63 ssize_t
cli_read(struct cli_state
*cli
, int fnum
, char *buf
, off_t offset
, size_t size
)
74 * Set readsize to the maximum size we can handle in one readX,
75 * rounded down to a multiple of 1024.
78 readsize
= (cli
->max_xmit
- (smb_size
+32)) & ~1023;
80 while (total
< size
) {
81 readsize
= MIN(readsize
, size
-total
);
83 /* Issue a read and receive a reply */
85 if (!cli_issue_read(cli
, fnum
, offset
, readsize
, 0))
88 if (!cli_receive_smb(cli
))
91 /* Check for error. Make sure to check for DOS and NT
94 if (cli_is_error(cli
)) {
95 BOOL recoverable_error
= False
;
96 NTSTATUS status
= NT_STATUS_OK
;
100 if (cli_is_nt_error(cli
))
101 status
= cli_nt_error(cli
);
103 cli_dos_error(cli
, &eclass
, &ecode
);
106 * ERRDOS ERRmoredata or STATUS_MORE_ENRTIES is a
107 * recoverable error, plus we have valid data in the
108 * packet so don't error out here.
111 if ((eclass
== ERRDOS
&& ecode
== ERRmoredata
) ||
112 NT_STATUS_V(status
) == NT_STATUS_V(STATUS_MORE_ENTRIES
))
113 recoverable_error
= True
;
115 if (!recoverable_error
)
119 size2
= SVAL(cli
->inbuf
, smb_vwv5
);
121 if (size2
> readsize
) {
122 DEBUG(5,("server returned more than we wanted!\n"));
124 } else if (size2
< 0) {
125 DEBUG(5,("read return < 0!\n"));
129 /* Copy data into buffer */
131 p
= smb_base(cli
->inbuf
) + SVAL(cli
->inbuf
,smb_vwv6
);
132 memcpy(buf
+ total
, p
, size2
);
138 * If the server returned less than we asked for we're at EOF.
141 if (size2
< readsize
)
148 #if 0 /* relies on client_receive_smb(), now a static in libsmb/clientgen.c */
150 /* This call is INCOMPATIBLE with SMB signing. If you remove the #if 0
151 you must fix ensure you don't attempt to sign the packets - data
152 *will* be currupted */
154 /****************************************************************************
155 Issue a single SMBreadraw and don't wait for a reply.
156 ****************************************************************************/
158 static BOOL
cli_issue_readraw(struct cli_state
*cli
, int fnum
, off_t offset
,
162 if (!cli
->sign_info
.use_smb_signing
) {
163 DEBUG(0, ("Cannot use readraw and SMB Signing\n"));
167 memset(cli
->outbuf
,'\0',smb_size
);
168 memset(cli
->inbuf
,'\0',smb_size
);
170 set_message(cli
->outbuf
,10,0,True
);
172 SCVAL(cli
->outbuf
,smb_com
,SMBreadbraw
);
173 SSVAL(cli
->outbuf
,smb_tid
,cli
->cnum
);
174 cli_setup_packet(cli
);
176 SSVAL(cli
->outbuf
,smb_vwv0
,fnum
);
177 SIVAL(cli
->outbuf
,smb_vwv1
,offset
);
178 SSVAL(cli
->outbuf
,smb_vwv2
,size
);
179 SSVAL(cli
->outbuf
,smb_vwv3
,size
);
180 SSVAL(cli
->outbuf
,smb_mid
,cli
->mid
+ i
);
182 return cli_send_smb(cli
);
185 /****************************************************************************
186 Tester for the readraw call.
187 ****************************************************************************/
189 ssize_t
cli_readraw(struct cli_state
*cli
, int fnum
, char *buf
, off_t offset
, size_t size
)
200 * Set readsize to the maximum size we can handle in one readraw.
205 while (total
< size
) {
206 readsize
= MIN(readsize
, size
-total
);
208 /* Issue a read and receive a reply */
210 if (!cli_issue_readraw(cli
, fnum
, offset
, readsize
, 0))
213 if (!client_receive_smb(cli
->fd
, cli
->inbuf
, cli
->timeout
))
216 size2
= smb_len(cli
->inbuf
);
218 if (size2
> readsize
) {
219 DEBUG(5,("server returned more than we wanted!\n"));
221 } else if (size2
< 0) {
222 DEBUG(5,("read return < 0!\n"));
226 /* Copy data into buffer */
230 memcpy(buf
+ total
, p
, size2
);
237 * If the server returned less than we asked for we're at EOF.
240 if (size2
< readsize
)
247 /****************************************************************************
248 issue a single SMBwrite and don't wait for a reply
249 ****************************************************************************/
251 static BOOL
cli_issue_write(struct cli_state
*cli
, int fnum
, off_t offset
,
252 uint16 mode
, const char *buf
,
256 BOOL bigoffset
= False
;
258 if (size
> cli
->bufsize
) {
259 cli
->outbuf
= realloc(cli
->outbuf
, size
+ 1024);
260 cli
->inbuf
= realloc(cli
->inbuf
, size
+ 1024);
261 if (cli
->outbuf
== NULL
|| cli
->inbuf
== NULL
)
263 cli
->bufsize
= size
+ 1024;
266 memset(cli
->outbuf
,'\0',smb_size
);
267 memset(cli
->inbuf
,'\0',smb_size
);
269 if ((SMB_BIG_UINT
)offset
>> 32)
273 set_message(cli
->outbuf
,14,0,True
);
275 set_message(cli
->outbuf
,12,0,True
);
277 SCVAL(cli
->outbuf
,smb_com
,SMBwriteX
);
278 SSVAL(cli
->outbuf
,smb_tid
,cli
->cnum
);
279 cli_setup_packet(cli
);
281 SCVAL(cli
->outbuf
,smb_vwv0
,0xFF);
282 SSVAL(cli
->outbuf
,smb_vwv2
,fnum
);
284 SIVAL(cli
->outbuf
,smb_vwv3
,offset
);
285 SIVAL(cli
->outbuf
,smb_vwv5
,0);
286 SSVAL(cli
->outbuf
,smb_vwv7
,mode
);
288 SSVAL(cli
->outbuf
,smb_vwv8
,(mode
& 0x0008) ? size
: 0);
290 * According to CIFS-TR-1p00, this following field should only
291 * be set if CAP_LARGE_WRITEX is set. We should check this
292 * locally. However, this check might already have been
293 * done by our callers.
295 SSVAL(cli
->outbuf
,smb_vwv9
,((size
>>16)&1));
296 SSVAL(cli
->outbuf
,smb_vwv10
,size
);
297 SSVAL(cli
->outbuf
,smb_vwv11
,
298 smb_buf(cli
->outbuf
) - smb_base(cli
->outbuf
));
301 SIVAL(cli
->outbuf
,smb_vwv12
,(offset
>>32) & 0xffffffff);
303 p
= smb_base(cli
->outbuf
) + SVAL(cli
->outbuf
,smb_vwv11
);
304 memcpy(p
, buf
, size
);
305 cli_setup_bcc(cli
, p
+size
);
307 SSVAL(cli
->outbuf
,smb_mid
,cli
->mid
+ i
);
309 show_msg(cli
->outbuf
);
310 return cli_send_smb(cli
);
313 /****************************************************************************
315 write_mode: 0x0001 disallow write cacheing
316 0x0002 return bytes remaining
317 0x0004 use raw named pipe protocol
318 0x0008 start of message mode named pipe protocol
319 ****************************************************************************/
321 ssize_t
cli_write(struct cli_state
*cli
,
322 int fnum
, uint16 write_mode
,
323 const char *buf
, off_t offset
, size_t size
)
328 int mpx
= MAX(cli
->max_mux
-1, 1);
329 int block
= (cli
->max_xmit
- (smb_size
+32)) & ~1023;
330 int blocks
= (size
+ (block
-1)) / block
;
332 while (received
< blocks
) {
334 while ((issued
- received
< mpx
) && (issued
< blocks
)) {
335 int bsent
= issued
* block
;
336 int size1
= MIN(block
, size
- bsent
);
338 if (!cli_issue_write(cli
, fnum
, offset
+ bsent
,
346 if (!cli_receive_smb(cli
))
351 if (cli_is_error(cli
))
354 bwritten
+= SVAL(cli
->inbuf
, smb_vwv2
);
355 bwritten
+= (((int)(SVAL(cli
->inbuf
, smb_vwv4
)))>>16);
358 while (received
< issued
&& cli_receive_smb(cli
))
364 /****************************************************************************
365 write to a file using a SMBwrite and not bypassing 0 byte writes
366 ****************************************************************************/
368 ssize_t
cli_smbwrite(struct cli_state
*cli
,
369 int fnum
, char *buf
, off_t offset
, size_t size1
)
375 size_t size
= MIN(size1
, cli
->max_xmit
- 48);
377 memset(cli
->outbuf
,'\0',smb_size
);
378 memset(cli
->inbuf
,'\0',smb_size
);
380 set_message(cli
->outbuf
,5, 0,True
);
382 SCVAL(cli
->outbuf
,smb_com
,SMBwrite
);
383 SSVAL(cli
->outbuf
,smb_tid
,cli
->cnum
);
384 cli_setup_packet(cli
);
386 SSVAL(cli
->outbuf
,smb_vwv0
,fnum
);
387 SSVAL(cli
->outbuf
,smb_vwv1
,size
);
388 SIVAL(cli
->outbuf
,smb_vwv2
,offset
);
389 SSVAL(cli
->outbuf
,smb_vwv4
,0);
391 p
= smb_buf(cli
->outbuf
);
393 SSVAL(p
, 0, size
); p
+= 2;
394 memcpy(p
, buf
, size
); p
+= size
;
396 cli_setup_bcc(cli
, p
);
398 if (!cli_send_smb(cli
))
401 if (!cli_receive_smb(cli
))
404 if (cli_is_error(cli
))
407 size
= SVAL(cli
->inbuf
,smb_vwv0
);