source4/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 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 ssize_t smbcli_read(struct smbcli_tree *tree, int fnum, void *_buf, off_t offset,
  30                  size_t size)
  31 {
  32         uint8_t *buf = (uint8_t *)_buf;
  33         union smb_read parms;
  34         int readsize;
  35         ssize_t total = 0;
  36
  37         if (size == 0) {
  38                 return 0;
  39         }
  40
  41         parms.readx.level = RAW_READ_READX;
  42         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         readsize = (tree->session->transport->negotiate.max_xmit - (MIN_SMB_SIZE+32));
  49         if (readsize > 0xFFFF) readsize = 0xFFFF;
  50
  51         while (total < size) {
  52                 NTSTATUS status;
  53
  54                 readsize = MIN(readsize, size-total);
  55
  56                 parms.readx.in.offset    = offset;
  57                 parms.readx.in.mincnt    = readsize;
  58                 parms.readx.in.maxcnt    = readsize;
  59                 parms.readx.in.remaining = size - total;
  60                 parms.readx.in.read_for_execute = false;
  61                 parms.readx.out.data     = buf + total;
  62
  63                 status = smb_raw_read(tree, &parms);
  64
  65                 if (!NT_STATUS_IS_OK(status)) {
  66                         return -1;
  67                 }
  68
  69                 total += parms.readx.out.nread;
  70                 offset += parms.readx.out.nread;
  71
  72                 /* If the server returned less than we asked for we're at EOF */
  73                 if (parms.readx.out.nread < readsize)
  74                         break;
  75         }
  76
  77         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 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         const uint8_t *buf = (const uint8_t *)_buf;
  93         union smb_write parms;
  94         int block = (tree->session->transport->negotiate.max_xmit - (MIN_SMB_SIZE+32));
  95         ssize_t total = 0;
  96
  97         if (size == 0) {
  98                 return 0;
  99         }
 100
 101         if (block > 0xFFFF) block = 0xFFFF;
 102
 103
 104         parms.writex.level = RAW_WRITE_WRITEX;
 105         parms.writex.in.file.fnum = fnum;
 106         parms.writex.in.wmode = write_mode;
 107         parms.writex.in.remaining = 0;
 108
 109         do {
 110                 NTSTATUS status;
 111
 112                 block = MIN(block, size - total);
 113
 114                 parms.writex.in.offset = offset;
 115                 parms.writex.in.count = block;
 116                 parms.writex.in.data = buf;
 117
 118                 status = smb_raw_write(tree, &parms);
 119
 120                 if (!NT_STATUS_IS_OK(status)) {
 121                         return -1;
 122                 }
 123
 124                 offset += parms.writex.out.nwritten;
 125                 total += parms.writex.out.nwritten;
 126                 buf += parms.writex.out.nwritten;
 127         } while (total < size);
 128
 129         return total;
 130 }
 131
 132 /****************************************************************************
 133   write to a file using a SMBwrite and not bypassing 0 byte writes
 134 ****************************************************************************/
 135 ssize_t smbcli_smbwrite(struct smbcli_tree *tree,
 136                      int fnum, const void *_buf, off_t offset, size_t size1)
 137 {
 138         const uint8_t *buf = (const uint8_t *)_buf;
 139         union smb_write parms;
 140         ssize_t total = 0;
 141
 142         parms.write.level = RAW_WRITE_WRITE;
 143         parms.write.in.remaining = 0;
 144
 145         do {
 146                 size_t size = MIN(size1, tree->session->transport->negotiate.max_xmit - 48);
 147                 if (size > 0xFFFF) size = 0xFFFF;
 148
 149                 parms.write.in.file.fnum = fnum;
 150                 parms.write.in.offset = offset;
 151                 parms.write.in.count = size;
 152                 parms.write.in.data = buf + total;
 153
 154                 if (NT_STATUS_IS_ERR(smb_raw_write(tree, &parms)))
 155                         return -1;
 156
 157                 size = parms.write.out.nwritten;
 158                 if (size == 0)
 159                         break;
 160
 161                 size1 -= size;
 162                 total += size;
 163                 offset += size;
 164         } while (size1);
 165
 166         return total;
 167 }