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7f41f13742
Signed-off-by: Bjoern Jacke <bjacke@samba.org> Reviewed-by: Martin Schwenke <martin@meltin.net>
168 lines
4.5 KiB
C
168 lines
4.5 KiB
C
/*
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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
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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.
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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 caching
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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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do {
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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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} while (total < size);
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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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if (NT_STATUS_IS_ERR(smb_raw_write(tree, &parms)))
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return -1;
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size = parms.write.out.nwritten;
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if (size == 0)
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break;
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size1 -= size;
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total += size;
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offset += size;
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} while (size1);
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return total;
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}
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