source/libcli/clireadwrite.c

   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 2 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, write to the Free Software
  19    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  20 */
  21
  22 #include "includes.h"
  23 #include "libcli/raw/libcliraw.h"
  24
  25 /****************************************************************************
  26   Read size bytes at offset offset using SMBreadX.
  27 ****************************************************************************/
  28 ssize_t smbcli_read(struct smbcli_tree *tree, int fnum, void *_buf, off_t offset,
  29                  size_t size)
  30 {
  31         uint8_t *buf = _buf;
  32         union smb_read parms;
  33         int readsize;
  34         ssize_t total = 0;
  35
  36         if (size == 0) {
  37                 return 0;
  38         }
  39
  40         parms.readx.level = RAW_READ_READX;
  41         parms.readx.in.fnum = fnum;
  42
  43         /*
  44          * Set readsize to the maximum size we can handle in one readX,
  45          * rounded down to a multiple of 1024.
  46          */
  47         readsize = (tree->session->transport->negotiate.max_xmit - (MIN_SMB_SIZE+32));
  48         if (readsize > 0xFFFF) readsize = 0xFFFF;
  49
  50         while (total < size) {
  51                 NTSTATUS status;
  52
  53                 readsize = MIN(readsize, size-total);
  54
  55                 parms.readx.in.offset    = offset;
  56                 parms.readx.in.mincnt    = readsize;
  57                 parms.readx.in.maxcnt    = readsize;
  58                 parms.readx.in.remaining = size - total;
  59                 parms.readx.out.data     = buf + total;
  60
  61                 status = smb_raw_read(tree, &parms);
  62
  63                 if (!NT_STATUS_IS_OK(status)) {
  64                         return -1;
  65                 }
  66
  67                 total += parms.readx.out.nread;
  68                 offset += parms.readx.out.nread;
  69
  70                 /* If the server returned less than we asked for we're at EOF */
  71                 if (parms.readx.out.nread < readsize)
  72                         break;
  73         }
  74
  75         return total;
  76 }
  77
  78
  79 /****************************************************************************
  80   write to a file
  81   write_mode: 0x0001 disallow write cacheing
  82               0x0002 return bytes remaining
  83               0x0004 use raw named pipe protocol
  84               0x0008 start of message mode named pipe protocol
  85 ****************************************************************************/
  86 ssize_t smbcli_write(struct smbcli_tree *tree,
  87                      int fnum, uint16_t write_mode,
  88                      const void *_buf, off_t offset, size_t size)
  89 {
  90         const uint8_t *buf = _buf;
  91         union smb_write parms;
  92         int block = (tree->session->transport->negotiate.max_xmit - (MIN_SMB_SIZE+32));
  93         ssize_t total = 0;
  94
  95         if (size == 0) {
  96                 return 0;
  97         }
  98
  99         if (block > 0xFFFF) block = 0xFFFF;
 100
 101
 102         parms.writex.level = RAW_WRITE_WRITEX;
 103         parms.writex.in.fnum = fnum;
 104         parms.writex.in.wmode = write_mode;
 105         parms.writex.in.remaining = 0;
 106
 107         while (total < size) {
 108                 NTSTATUS status;
 109
 110                 block = MIN(block, size - total);
 111
 112                 parms.writex.in.offset = offset;
 113                 parms.writex.in.count = block;
 114                 parms.writex.in.data = buf;
 115
 116                 status = smb_raw_write(tree, &parms);
 117
 118                 if (!NT_STATUS_IS_OK(status)) {
 119                         return -1;
 120                 }
 121
 122                 offset += parms.writex.out.nwritten;
 123                 total += parms.writex.out.nwritten;
 124                 buf += parms.writex.out.nwritten;
 125         }
 126
 127         return total;
 128 }
 129
 130 /****************************************************************************
 131   write to a file using a SMBwrite and not bypassing 0 byte writes
 132 ****************************************************************************/
 133 ssize_t smbcli_smbwrite(struct smbcli_tree *tree,
 134                      int fnum, const void *_buf, off_t offset, size_t size1)
 135 {
 136         const uint8_t *buf = _buf;
 137         union smb_write parms;
 138         ssize_t total = 0;
 139
 140         parms.write.level = RAW_WRITE_WRITE;
 141         parms.write.in.remaining = 0;
 142
 143         do {
 144                 size_t size = MIN(size1, tree->session->transport->negotiate.max_xmit - 48);
 145                 if (size > 0xFFFF) size = 0xFFFF;
 146
 147                 parms.write.in.fnum = fnum;
 148                 parms.write.in.offset = offset;
 149                 parms.write.in.count = size;
 150                 parms.write.in.data = buf + total;
 151
 152                 if (NT_STATUS_IS_ERR(smb_raw_write(tree, &parms)))
 153                         return -1;
 154
 155                 size = parms.write.out.nwritten;
 156                 if (size == 0)
 157                         break;
 158
 159                 size1 -= size;
 160                 total += size;
 161                 offset += size;
 162         } while (size1);
 163
 164         return total;
 165 }