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