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, uint16 mode, char *buf,
255 BOOL bigoffset = False;
257 if (size > cli->bufsize) {
258 cli->outbuf = realloc(cli->outbuf, size + 1024);
259 cli->inbuf = realloc(cli->inbuf, size + 1024);
260 if (cli->outbuf == NULL || cli->inbuf == NULL)
262 cli->bufsize = size + 1024;
265 memset(cli->outbuf,'\0',smb_size);
266 memset(cli->inbuf,'\0',smb_size);
268 if ((SMB_BIG_UINT)offset >> 32)
272 set_message(cli->outbuf,14,0,True);
274 set_message(cli->outbuf,12,0,True);
276 SCVAL(cli->outbuf,smb_com,SMBwriteX);
277 SSVAL(cli->outbuf,smb_tid,cli->cnum);
278 cli_setup_packet(cli);
280 SCVAL(cli->outbuf,smb_vwv0,0xFF);
281 SSVAL(cli->outbuf,smb_vwv2,fnum);
283 SIVAL(cli->outbuf,smb_vwv3,offset);
284 SIVAL(cli->outbuf,smb_vwv5,0);
285 SSVAL(cli->outbuf,smb_vwv7,mode);
288 * THe following is still wrong ...
290 SSVAL(cli->outbuf,smb_vwv8,(mode & 0x0008) ? size : 0);
291 SSVAL(cli->outbuf,smb_vwv9,((size>>16)&1));
292 SSVAL(cli->outbuf,smb_vwv10,size);
293 SSVAL(cli->outbuf,smb_vwv11,
294 smb_buf(cli->outbuf) - smb_base(cli->outbuf));
297 SIVAL(cli->outbuf,smb_vwv12,(offset>>32) & 0xffffffff);
299 p = smb_base(cli->outbuf) + SVAL(cli->outbuf,smb_vwv11);
300 memcpy(p, buf, size);
301 cli_setup_bcc(cli, p+size);
303 SSVAL(cli->outbuf,smb_mid,cli->mid + i);
305 show_msg(cli->outbuf);
306 return cli_send_smb(cli);
309 /****************************************************************************
311 write_mode: 0x0001 disallow write cacheing
312 0x0002 return bytes remaining
313 0x0004 use raw named pipe protocol
314 0x0008 start of message mode named pipe protocol
315 ****************************************************************************/
317 ssize_t cli_write(struct cli_state *cli,
318 int fnum, uint16 write_mode,
319 char *buf, off_t offset, size_t size)
324 int mpx = MAX(cli->max_mux-1, 1);
325 int block = (cli->max_xmit - (smb_size+32)) & ~1023;
326 int blocks = (size + (block-1)) / block;
328 while (received < blocks) {
330 while ((issued - received < mpx) && (issued < blocks)) {
331 int bsent = issued * block;
332 int size1 = MIN(block, size - bsent);
334 if (!cli_issue_write(cli, fnum, offset + bsent,
342 if (!cli_receive_smb(cli))
347 if (cli_is_error(cli))
350 bwritten += SVAL(cli->inbuf, smb_vwv2);
351 bwritten += (((int)(SVAL(cli->inbuf, smb_vwv4)))>>16);
354 while (received < issued && cli_receive_smb(cli))
360 /****************************************************************************
361 write to a file using a SMBwrite and not bypassing 0 byte writes
362 ****************************************************************************/
364 ssize_t cli_smbwrite(struct cli_state *cli,
365 int fnum, char *buf, off_t offset, size_t size1)
371 size_t size = MIN(size1, cli->max_xmit - 48);
373 memset(cli->outbuf,'\0',smb_size);
374 memset(cli->inbuf,'\0',smb_size);
376 set_message(cli->outbuf,5, 0,True);
378 SCVAL(cli->outbuf,smb_com,SMBwrite);
379 SSVAL(cli->outbuf,smb_tid,cli->cnum);
380 cli_setup_packet(cli);
382 SSVAL(cli->outbuf,smb_vwv0,fnum);
383 SSVAL(cli->outbuf,smb_vwv1,size);
384 SIVAL(cli->outbuf,smb_vwv2,offset);
385 SSVAL(cli->outbuf,smb_vwv4,0);
387 p = smb_buf(cli->outbuf);
389 SSVAL(p, 0, size); p += 2;
390 memcpy(p, buf, size); p += size;
392 cli_setup_bcc(cli, p);
394 if (!cli_send_smb(cli))
397 if (!cli_receive_smb(cli))
400 if (cli_is_error(cli))
403 size = SVAL(cli->inbuf,smb_vwv0);