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