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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-05-05 17:47:29 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-05-05 17:47:29 +0000 |
commit | 4f5791ebd03eaec1c7da0865a383175b05102712 (patch) | |
tree | 8ce7b00f7a76baa386372422adebbe64510812d4 /source4/ntvfs/posix/pvfs_read.c | |
parent | Initial commit. (diff) | |
download | samba-4f5791ebd03eaec1c7da0865a383175b05102712.tar.xz samba-4f5791ebd03eaec1c7da0865a383175b05102712.zip |
Adding upstream version 2:4.17.12+dfsg.upstream/2%4.17.12+dfsgupstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'source4/ntvfs/posix/pvfs_read.c')
-rw-r--r-- | source4/ntvfs/posix/pvfs_read.c | 103 |
1 files changed, 103 insertions, 0 deletions
diff --git a/source4/ntvfs/posix/pvfs_read.c b/source4/ntvfs/posix/pvfs_read.c new file mode 100644 index 0000000..09eedd5 --- /dev/null +++ b/source4/ntvfs/posix/pvfs_read.c @@ -0,0 +1,103 @@ +/* + Unix SMB/CIFS implementation. + + POSIX NTVFS backend - read + + Copyright (C) Andrew Tridgell 2004 + + 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 "vfs_posix.h" +#include "lib/events/events.h" + +/* + read from a file +*/ +NTSTATUS pvfs_read(struct ntvfs_module_context *ntvfs, + struct ntvfs_request *req, union smb_read *rd) +{ + struct pvfs_state *pvfs = talloc_get_type(ntvfs->private_data, + struct pvfs_state); + ssize_t ret; + struct pvfs_file *f; + NTSTATUS status; + uint32_t maxcnt; + uint32_t mask; + + if (rd->generic.level != RAW_READ_READX) { + return ntvfs_map_read(ntvfs, req, rd); + } + + f = pvfs_find_fd(pvfs, req, rd->readx.in.file.ntvfs); + if (!f) { + return NT_STATUS_INVALID_HANDLE; + } + + if (f->handle->fd == -1) { + return NT_STATUS_INVALID_DEVICE_REQUEST; + } + + mask = SEC_FILE_READ_DATA; + if (rd->readx.in.read_for_execute) { + mask |= SEC_FILE_EXECUTE; + } + if (!(f->access_mask & mask)) { + return NT_STATUS_ACCESS_DENIED; + } + + maxcnt = rd->readx.in.maxcnt; + if (maxcnt > 2*UINT16_MAX && req->ctx->protocol < PROTOCOL_SMB2_02) { + DEBUG(3,(__location__ ": Invalid SMB maxcnt 0x%x\n", maxcnt)); + return NT_STATUS_INVALID_PARAMETER; + } + + status = pvfs_check_lock(pvfs, f, req->smbpid, + rd->readx.in.offset, + maxcnt, + READ_LOCK); + if (!NT_STATUS_IS_OK(status)) { + return status; + } + + if (f->handle->name->stream_name) { + ret = pvfs_stream_read(pvfs, f->handle, + rd->readx.out.data, maxcnt, rd->readx.in.offset); + } else { + ret = pread(f->handle->fd, + rd->readx.out.data, + maxcnt, + rd->readx.in.offset); + } + if (ret == -1) { + return pvfs_map_errno(pvfs, errno); + } + + /* only SMB2 honors mincnt */ + if (req->ctx->protocol >= PROTOCOL_SMB2_02) { + if (rd->readx.in.mincnt > ret || + (ret == 0 && maxcnt > 0)) { + return NT_STATUS_END_OF_FILE; + } + } + + f->handle->position = f->handle->seek_offset = rd->readx.in.offset + ret; + + rd->readx.out.nread = ret; + rd->readx.out.remaining = 0xFFFF; + rd->readx.out.compaction_mode = 0; + + return NT_STATUS_OK; +} |