Line data    Source code

       1             : /* 
       2             :    Unix SMB/CIFS implementation.
       3             :    client file read/write routines
       4             :    Copyright (C) Andrew Tridgell 1994-1998
       5             :    Copyright (C) James Myers 2003
       6             :    
       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 3 of the License, or
      10             :    (at your option) any later version.
      11             :    
      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.
      16             :    
      17             :    You should have received a copy of the GNU General Public License
      18             :    along with this program.  If not, see <http://www.gnu.org/licenses/>.
      19             : */
      20             : 
      21             : #include "includes.h"
      22             : #include "libcli/raw/libcliraw.h"
      23             : #include "libcli/raw/raw_proto.h"
      24             : #include "libcli/libcli.h"
      25             : 
      26             : /****************************************************************************
      27             :   Read size bytes at offset offset using SMBreadX.
      28             : ****************************************************************************/
      29        1453 : ssize_t smbcli_read(struct smbcli_tree *tree, int fnum, void *_buf, off_t offset, 
      30             :                  size_t size)
      31             : {
      32        1453 :         uint8_t *buf = (uint8_t *)_buf;
      33          23 :         union smb_read parms;
      34          23 :         int readsize;
      35        1453 :         ssize_t total = 0;
      36             :         
      37        1453 :         if (size == 0) {
      38           0 :                 return 0;
      39             :         }
      40             : 
      41        1453 :         parms.readx.level = RAW_READ_READX;
      42        1453 :         parms.readx.in.file.fnum = fnum;
      43             : 
      44             :         /*
      45             :          * Set readsize to the maximum size we can handle in one readX,
      46             :          * rounded down to a multiple of 1024.
      47             :          */
      48        1453 :         readsize = (tree->session->transport->negotiate.max_xmit - (MIN_SMB_SIZE+32));
      49        1453 :         if (readsize > 0xFFFF) readsize = 0xFFFF;
      50             : 
      51        3062 :         while (total < size) {
      52          23 :                 NTSTATUS status;
      53             : 
      54        2002 :                 readsize = MIN(readsize, size-total);
      55             : 
      56        2002 :                 parms.readx.in.offset    = offset;
      57        2002 :                 parms.readx.in.mincnt    = readsize;
      58        2002 :                 parms.readx.in.maxcnt    = readsize;
      59        2002 :                 parms.readx.in.remaining = size - total;
      60        2002 :                 parms.readx.in.read_for_execute = false;
      61        2002 :                 parms.readx.out.data     = buf + total;
      62             :                 
      63        2002 :                 status = smb_raw_read(tree, &parms);
      64             :                 
      65        2002 :                 if (!NT_STATUS_IS_OK(status)) {
      66         351 :                         return -1;
      67             :                 }
      68             : 
      69        1651 :                 total += parms.readx.out.nread;
      70        1651 :                 offset += parms.readx.out.nread;
      71             : 
      72             :                 /* If the server returned less than we asked for we're at EOF */
      73        1651 :                 if (parms.readx.out.nread < readsize)
      74          42 :                         break;
      75             :         }
      76             : 
      77        1080 :         return total;
      78             : }
      79             : 
      80             : 
      81             : /****************************************************************************
      82             :   write to a file
      83             :   write_mode: 0x0001 disallow write caching
      84             :               0x0002 return bytes remaining
      85             :               0x0004 use raw named pipe protocol
      86             :               0x0008 start of message mode named pipe protocol
      87             : ****************************************************************************/
      88        2788 : ssize_t smbcli_write(struct smbcli_tree *tree,
      89             :                      int fnum, uint16_t write_mode,
      90             :                      const void *_buf, off_t offset, size_t size)
      91             : {
      92        2788 :         const uint8_t *buf = (const uint8_t *)_buf;
      93          46 :         union smb_write parms;
      94        2788 :         int block = (tree->session->transport->negotiate.max_xmit - (MIN_SMB_SIZE+32));
      95        2788 :         ssize_t total = 0;
      96             : 
      97        2788 :         if (size == 0) {
      98          32 :                 return 0;
      99             :         }
     100             : 
     101        2756 :         if (block > 0xFFFF) block = 0xFFFF;
     102             : 
     103             : 
     104        2756 :         parms.writex.level = RAW_WRITE_WRITEX;
     105        2756 :         parms.writex.in.file.fnum = fnum;
     106        2756 :         parms.writex.in.wmode = write_mode;
     107        2756 :         parms.writex.in.remaining = 0;
     108             : 
     109          52 :         do {
     110          52 :                 NTSTATUS status;
     111             : 
     112        3411 :                 block = MIN(block, size - total);
     113             : 
     114        3411 :                 parms.writex.in.offset = offset;
     115        3411 :                 parms.writex.in.count = block;
     116        3411 :                 parms.writex.in.data = buf;
     117             : 
     118        3411 :                 status = smb_raw_write(tree, &parms);
     119             : 
     120        3411 :                 if (!NT_STATUS_IS_OK(status)) {
     121         422 :                         return -1;
     122             :                 }
     123             : 
     124        2989 :                 offset += parms.writex.out.nwritten;
     125        2989 :                 total += parms.writex.out.nwritten;
     126        2989 :                 buf += parms.writex.out.nwritten;
     127        2989 :         } while (total < size);
     128             : 
     129        2294 :         return total;
     130             : }
     131             : 
     132             : /****************************************************************************
     133             :   write to a file using a SMBwrite and not bypassing 0 byte writes
     134             : ****************************************************************************/
     135          67 : ssize_t smbcli_smbwrite(struct smbcli_tree *tree,
     136             :                      int fnum, const void *_buf, off_t offset, size_t size1)
     137             : {
     138          67 :         const uint8_t *buf = (const uint8_t *)_buf;
     139           0 :         union smb_write parms;
     140          67 :         ssize_t total = 0;
     141             : 
     142          67 :         parms.write.level = RAW_WRITE_WRITE;
     143          67 :         parms.write.in.remaining = 0;
     144             :         
     145           0 :         do {
     146          67 :                 size_t size = MIN(size1, tree->session->transport->negotiate.max_xmit - 48);
     147          67 :                 if (size > 0xFFFF) size = 0xFFFF;
     148             :                 
     149          67 :                 parms.write.in.file.fnum = fnum;
     150          67 :                 parms.write.in.offset = offset;
     151          67 :                 parms.write.in.count = size;
     152          67 :                 parms.write.in.data = buf + total;
     153             : 
     154          67 :                 if (NT_STATUS_IS_ERR(smb_raw_write(tree, &parms)))
     155           0 :                         return -1;
     156             : 
     157          67 :                 size = parms.write.out.nwritten;
     158          67 :                 if (size == 0)
     159          52 :                         break;
     160             : 
     161          15 :                 size1 -= size;
     162          15 :                 total += size;
     163          15 :                 offset += size;
     164          15 :         } while (size1);
     165             : 
     166          67 :         return total;
     167             : }