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Viewing changes to source4/libcli/clireadwrite.c

  • Committer: Chuck Short
  • Date: 2010-09-28 20:38:39 UTC
  • Revision ID: zulcss@ubuntu.com-20100928203839-pgjulytsi9ue63x1
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source4/libcli/clireadwrite.c
 
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/* 
 
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   Unix SMB/CIFS implementation.
 
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   client file read/write routines
 
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   Copyright (C) Andrew Tridgell 1994-1998
 
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   Copyright (C) James Myers 2003
 
6
   
 
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   This program is free software; you can redistribute it and/or modify
 
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   it under the terms of the GNU General Public License as published by
 
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   the Free Software Foundation; either version 3 of the License, or
 
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   (at your option) any later version.
 
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   This program is distributed in the hope that it will be useful,
 
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   but WITHOUT ANY WARRANTY; without even the implied warranty of
 
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   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 
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   GNU General Public License for more details.
 
16
   
 
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   You should have received a copy of the GNU General Public License
 
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   along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
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*/
 
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#include "includes.h"
 
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#include "libcli/raw/libcliraw.h"
 
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#include "libcli/raw/raw_proto.h"
 
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#include "libcli/libcli.h"
 
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/****************************************************************************
 
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  Read size bytes at offset offset using SMBreadX.
 
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****************************************************************************/
 
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ssize_t smbcli_read(struct smbcli_tree *tree, int fnum, void *_buf, off_t offset, 
 
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                 size_t size)
 
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{
 
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        uint8_t *buf = (uint8_t *)_buf;
 
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        union smb_read parms;
 
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        int readsize;
 
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        ssize_t total = 0;
 
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        if (size == 0) {
 
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                return 0;
 
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        }
 
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        parms.readx.level = RAW_READ_READX;
 
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        parms.readx.in.file.fnum = fnum;
 
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        /*
 
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         * Set readsize to the maximum size we can handle in one readX,
 
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         * rounded down to a multiple of 1024.
 
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         */
 
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        readsize = (tree->session->transport->negotiate.max_xmit - (MIN_SMB_SIZE+32));
 
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        if (readsize > 0xFFFF) readsize = 0xFFFF;
 
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        while (total < size) {
 
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                NTSTATUS status;
 
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                readsize = MIN(readsize, size-total);
 
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                parms.readx.in.offset    = offset;
 
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                parms.readx.in.mincnt    = readsize;
 
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                parms.readx.in.maxcnt    = readsize;
 
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                parms.readx.in.remaining = size - total;
 
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                parms.readx.in.read_for_execute = false;
 
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                parms.readx.out.data     = buf + total;
 
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                status = smb_raw_read(tree, &parms);
 
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                if (!NT_STATUS_IS_OK(status)) {
 
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                        return -1;
 
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                }
 
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                total += parms.readx.out.nread;
 
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                offset += parms.readx.out.nread;
 
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                /* If the server returned less than we asked for we're at EOF */
 
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                if (parms.readx.out.nread < readsize)
 
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                        break;
 
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        }
 
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        return total;
 
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}
 
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/****************************************************************************
 
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  write to a file
 
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  write_mode: 0x0001 disallow write cacheing
 
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              0x0002 return bytes remaining
 
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              0x0004 use raw named pipe protocol
 
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              0x0008 start of message mode named pipe protocol
 
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****************************************************************************/
 
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ssize_t smbcli_write(struct smbcli_tree *tree,
 
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                     int fnum, uint16_t write_mode,
 
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                     const void *_buf, off_t offset, size_t size)
 
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{
 
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        const uint8_t *buf = (const uint8_t *)_buf;
 
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        union smb_write parms;
 
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        int block = (tree->session->transport->negotiate.max_xmit - (MIN_SMB_SIZE+32));
 
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        ssize_t total = 0;
 
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        if (size == 0) {
 
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                return 0;
 
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        }
 
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        if (block > 0xFFFF) block = 0xFFFF;
 
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        parms.writex.level = RAW_WRITE_WRITEX;
 
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        parms.writex.in.file.fnum = fnum;
 
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        parms.writex.in.wmode = write_mode;
 
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        parms.writex.in.remaining = 0;
 
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        while (total < size) {
 
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                NTSTATUS status;
 
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                block = MIN(block, size - total);
 
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                parms.writex.in.offset = offset;
 
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                parms.writex.in.count = block;
 
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                parms.writex.in.data = buf;
 
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                status = smb_raw_write(tree, &parms);
 
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                if (!NT_STATUS_IS_OK(status)) {
 
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                        return -1;
 
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                }
 
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                offset += parms.writex.out.nwritten;
 
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                total += parms.writex.out.nwritten;
 
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                buf += parms.writex.out.nwritten;
 
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        }
 
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        return total;
 
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}
 
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/****************************************************************************
 
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  write to a file using a SMBwrite and not bypassing 0 byte writes
 
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****************************************************************************/
 
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ssize_t smbcli_smbwrite(struct smbcli_tree *tree,
 
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                     int fnum, const void *_buf, off_t offset, size_t size1)
 
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{
 
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        const uint8_t *buf = (const uint8_t *)_buf;
 
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        union smb_write parms;
 
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        ssize_t total = 0;
 
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        parms.write.level = RAW_WRITE_WRITE;
 
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        parms.write.in.remaining = 0;
 
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        do {
 
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                size_t size = MIN(size1, tree->session->transport->negotiate.max_xmit - 48);
 
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                if (size > 0xFFFF) size = 0xFFFF;
 
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                parms.write.in.file.fnum = fnum;
 
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                parms.write.in.offset = offset;
 
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                parms.write.in.count = size;
 
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                parms.write.in.data = buf + total;
 
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154
                if (NT_STATUS_IS_ERR(smb_raw_write(tree, &parms)))
 
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                        return -1;
 
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157
                size = parms.write.out.nwritten;
 
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                if (size == 0)
 
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                        break;
 
160
 
 
161
                size1 -= size;
 
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                total += size;
 
163
                offset += size;
 
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        } while (size1);
 
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        return total;
 
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}