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 memset(cli
->outbuf
,'\0',smb_size
);
33 memset(cli
->inbuf
,'\0',smb_size
);
35 set_message(cli
->outbuf
,10,0,True
);
37 SCVAL(cli
->outbuf
,smb_com
,SMBreadX
);
38 SSVAL(cli
->outbuf
,smb_tid
,cli
->cnum
);
39 cli_setup_packet(cli
);
41 SCVAL(cli
->outbuf
,smb_vwv0
,0xFF);
42 SSVAL(cli
->outbuf
,smb_vwv2
,fnum
);
43 SIVAL(cli
->outbuf
,smb_vwv3
,offset
);
44 SSVAL(cli
->outbuf
,smb_vwv5
,size
);
45 SSVAL(cli
->outbuf
,smb_vwv6
,size
);
46 SSVAL(cli
->outbuf
,smb_mid
,cli
->mid
+ i
);
48 return cli_send_smb(cli
);
51 /****************************************************************************
52 Read size bytes at offset offset using SMBreadX.
53 ****************************************************************************/
55 ssize_t
cli_read(struct cli_state
*cli
, int fnum
, char *buf
, off_t offset
, size_t size
)
66 * Set readsize to the maximum size we can handle in one readX,
67 * rounded down to a multiple of 1024.
70 readsize
= (cli
->max_xmit
- (smb_size
+32)) & ~1023;
72 while (total
< size
) {
73 readsize
= MIN(readsize
, size
-total
);
75 /* Issue a read and receive a reply */
77 if (!cli_issue_read(cli
, fnum
, offset
, readsize
, 0))
80 if (!cli_receive_smb(cli
))
83 /* Check for error. Make sure to check for DOS and NT
86 if (cli_is_error(cli
)) {
87 BOOL recoverable_error
= False
;
88 NTSTATUS status
= NT_STATUS_OK
;
92 if (cli_is_nt_error(cli
))
93 status
= cli_nt_error(cli
);
95 cli_dos_error(cli
, &eclass
, &ecode
);
98 * ERRDOS ERRmoredata or STATUS_MORE_ENRTIES is a
99 * recoverable error, plus we have valid data in the
100 * packet so don't error out here.
103 if ((eclass
== ERRDOS
&& ecode
== ERRmoredata
) ||
104 NT_STATUS_V(status
) == NT_STATUS_V(STATUS_MORE_ENTRIES
))
105 recoverable_error
= True
;
107 if (!recoverable_error
)
111 size2
= SVAL(cli
->inbuf
, smb_vwv5
);
113 if (size2
> readsize
) {
114 DEBUG(5,("server returned more than we wanted!\n"));
116 } else if (size2
< 0) {
117 DEBUG(5,("read return < 0!\n"));
121 /* Copy data into buffer */
123 p
= smb_base(cli
->inbuf
) + SVAL(cli
->inbuf
,smb_vwv6
);
124 memcpy(buf
+ total
, p
, size2
);
130 * If the server returned less than we asked for we're at EOF.
133 if (size2
< readsize
)
140 #if 0 /* relies on client_receive_smb(), now a static in libsmb/clientgen.c */
142 /* This call is INCOMPATIBLE with SMB signing. If you remove the #if 0
143 you must fix ensure you don't attempt to sign the packets - data
144 *will* be currupted */
146 /****************************************************************************
147 Issue a single SMBreadraw and don't wait for a reply.
148 ****************************************************************************/
150 static BOOL
cli_issue_readraw(struct cli_state
*cli
, int fnum
, off_t offset
,
154 if (!cli
->sign_info
.use_smb_signing
) {
155 DEBUG(0, ("Cannot use readraw and SMB Signing\n"));
159 memset(cli
->outbuf
,'\0',smb_size
);
160 memset(cli
->inbuf
,'\0',smb_size
);
162 set_message(cli
->outbuf
,10,0,True
);
164 SCVAL(cli
->outbuf
,smb_com
,SMBreadbraw
);
165 SSVAL(cli
->outbuf
,smb_tid
,cli
->cnum
);
166 cli_setup_packet(cli
);
168 SSVAL(cli
->outbuf
,smb_vwv0
,fnum
);
169 SIVAL(cli
->outbuf
,smb_vwv1
,offset
);
170 SSVAL(cli
->outbuf
,smb_vwv2
,size
);
171 SSVAL(cli
->outbuf
,smb_vwv3
,size
);
172 SSVAL(cli
->outbuf
,smb_mid
,cli
->mid
+ i
);
174 return cli_send_smb(cli
);
177 /****************************************************************************
178 Tester for the readraw call.
179 ****************************************************************************/
181 ssize_t
cli_readraw(struct cli_state
*cli
, int fnum
, char *buf
, off_t offset
, size_t size
)
192 * Set readsize to the maximum size we can handle in one readraw.
197 while (total
< size
) {
198 readsize
= MIN(readsize
, size
-total
);
200 /* Issue a read and receive a reply */
202 if (!cli_issue_readraw(cli
, fnum
, offset
, readsize
, 0))
205 if (!client_receive_smb(cli
->fd
, cli
->inbuf
, cli
->timeout
))
208 size2
= smb_len(cli
->inbuf
);
210 if (size2
> readsize
) {
211 DEBUG(5,("server returned more than we wanted!\n"));
213 } else if (size2
< 0) {
214 DEBUG(5,("read return < 0!\n"));
218 /* Copy data into buffer */
222 memcpy(buf
+ total
, p
, size2
);
229 * If the server returned less than we asked for we're at EOF.
232 if (size2
< readsize
)
239 /****************************************************************************
240 issue a single SMBwrite and don't wait for a reply
241 ****************************************************************************/
243 static BOOL
cli_issue_write(struct cli_state
*cli
, int fnum
, off_t offset
, uint16 mode
, char *buf
,
248 if (size
> cli
->bufsize
) {
249 cli
->outbuf
= realloc(cli
->outbuf
, size
+ 1024);
250 cli
->inbuf
= realloc(cli
->inbuf
, size
+ 1024);
251 if (cli
->outbuf
== NULL
|| cli
->inbuf
== NULL
)
253 cli
->bufsize
= size
+ 1024;
256 memset(cli
->outbuf
,'\0',smb_size
);
257 memset(cli
->inbuf
,'\0',smb_size
);
260 set_message(cli
->outbuf
,14,0,True
);
262 set_message(cli
->outbuf
,12,0,True
);
264 SCVAL(cli
->outbuf
,smb_com
,SMBwriteX
);
265 SSVAL(cli
->outbuf
,smb_tid
,cli
->cnum
);
266 cli_setup_packet(cli
);
268 SCVAL(cli
->outbuf
,smb_vwv0
,0xFF);
269 SSVAL(cli
->outbuf
,smb_vwv2
,fnum
);
271 SIVAL(cli
->outbuf
,smb_vwv3
,offset
);
272 SIVAL(cli
->outbuf
,smb_vwv5
,(mode
& 0x0008) ? 0xFFFFFFFF : 0);
273 SSVAL(cli
->outbuf
,smb_vwv7
,mode
);
275 SSVAL(cli
->outbuf
,smb_vwv8
,(mode
& 0x0008) ? size
: 0);
276 SSVAL(cli
->outbuf
,smb_vwv9
,((size
>>16)&1));
277 SSVAL(cli
->outbuf
,smb_vwv10
,size
);
278 SSVAL(cli
->outbuf
,smb_vwv11
,
279 smb_buf(cli
->outbuf
) - smb_base(cli
->outbuf
));
281 p
= smb_base(cli
->outbuf
) + SVAL(cli
->outbuf
,smb_vwv11
);
282 memcpy(p
, buf
, size
);
283 cli_setup_bcc(cli
, p
+size
);
285 SSVAL(cli
->outbuf
,smb_mid
,cli
->mid
+ i
);
287 show_msg(cli
->outbuf
);
288 return cli_send_smb(cli
);
291 /****************************************************************************
293 write_mode: 0x0001 disallow write cacheing
294 0x0002 return bytes remaining
295 0x0004 use raw named pipe protocol
296 0x0008 start of message mode named pipe protocol
297 ****************************************************************************/
299 ssize_t
cli_write(struct cli_state
*cli
,
300 int fnum
, uint16 write_mode
,
301 char *buf
, off_t offset
, size_t size
)
306 int mpx
= MAX(cli
->max_mux
-1, 1);
307 int block
= (cli
->max_xmit
- (smb_size
+32)) & ~1023;
308 int blocks
= (size
+ (block
-1)) / block
;
310 while (received
< blocks
) {
312 while ((issued
- received
< mpx
) && (issued
< blocks
)) {
313 int bsent
= issued
* block
;
314 int size1
= MIN(block
, size
- bsent
);
316 if (!cli_issue_write(cli
, fnum
, offset
+ bsent
,
324 if (!cli_receive_smb(cli
))
329 if (cli_is_error(cli
))
332 bwritten
+= SVAL(cli
->inbuf
, smb_vwv2
);
333 bwritten
+= (((int)(SVAL(cli
->inbuf
, smb_vwv4
)))>>16);
336 while (received
< issued
&& cli_receive_smb(cli
))
342 /****************************************************************************
343 write to a file using a SMBwrite and not bypassing 0 byte writes
344 ****************************************************************************/
346 ssize_t
cli_smbwrite(struct cli_state
*cli
,
347 int fnum
, char *buf
, off_t offset
, size_t size1
)
353 size_t size
= MIN(size1
, cli
->max_xmit
- 48);
355 memset(cli
->outbuf
,'\0',smb_size
);
356 memset(cli
->inbuf
,'\0',smb_size
);
358 set_message(cli
->outbuf
,5, 0,True
);
360 SCVAL(cli
->outbuf
,smb_com
,SMBwrite
);
361 SSVAL(cli
->outbuf
,smb_tid
,cli
->cnum
);
362 cli_setup_packet(cli
);
364 SSVAL(cli
->outbuf
,smb_vwv0
,fnum
);
365 SSVAL(cli
->outbuf
,smb_vwv1
,size
);
366 SIVAL(cli
->outbuf
,smb_vwv2
,offset
);
367 SSVAL(cli
->outbuf
,smb_vwv4
,0);
369 p
= smb_buf(cli
->outbuf
);
371 SSVAL(p
, 0, size
); p
+= 2;
372 memcpy(p
, buf
, size
); p
+= size
;
374 cli_setup_bcc(cli
, p
);
376 if (!cli_send_smb(cli
))
379 if (!cli_receive_smb(cli
))
382 if (cli_is_error(cli
))
385 size
= SVAL(cli
->inbuf
,smb_vwv0
);