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/*
Unix SMB/CIFS implementation.
POSIX NTVFS backend - xattr support using filesystem xattrs
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"
/*
pull a xattr as a blob, from either a file or a file descriptor
*/
NTSTATUS pull_xattr_blob_system(struct pvfs_state *pvfs,
TALLOC_CTX *mem_ctx,
const char *attr_name,
const char *fname,
int fd,
size_t estimated_size,
DATA_BLOB *blob)
{
int ret;
*blob = data_blob_talloc(mem_ctx, NULL, estimated_size+16);
if (blob->data == NULL) {
return NT_STATUS_NO_MEMORY;
}
again:
if (fd != -1) {
ret = fgetxattr(fd, attr_name, blob->data, estimated_size);
} else {
ret = getxattr(fname, attr_name, blob->data, estimated_size);
}
if (ret == -1 && errno == ERANGE) {
estimated_size *= 2;
blob->data = talloc_realloc(mem_ctx, blob->data,
uint8_t, estimated_size);
if (blob->data == NULL) {
return NT_STATUS_NO_MEMORY;
}
blob->length = estimated_size;
goto again;
}
if (ret == -1 && errno == EPERM) {
struct stat statbuf;
if (fd != -1) {
ret = fstat(fd, &statbuf);
} else {
ret = stat(fname, &statbuf);
}
if (ret == 0) {
/* check if this is a directory and the sticky bit is set */
if (S_ISDIR(statbuf.st_mode) && (statbuf.st_mode & S_ISVTX)) {
/* pretend we could not find the xattr */
data_blob_free(blob);
return NT_STATUS_NOT_FOUND;
} else {
/* if not this was probably a legitimate error
* reset ret and errno to the correct values */
errno = EPERM;
ret = -1;
}
}
}
if (ret == -1) {
data_blob_free(blob);
return pvfs_map_errno(pvfs, errno);
}
blob->length = ret;
return NT_STATUS_OK;
}
/*
push a xattr as a blob, from either a file or a file descriptor
*/
NTSTATUS push_xattr_blob_system(struct pvfs_state *pvfs,
const char *attr_name,
const char *fname,
int fd,
const DATA_BLOB *blob)
{
int ret;
if (fd != -1) {
ret = fsetxattr(fd, attr_name, blob->data, blob->length, 0);
} else {
ret = setxattr(fname, attr_name, blob->data, blob->length, 0);
}
if (ret == -1) {
return pvfs_map_errno(pvfs, errno);
}
return NT_STATUS_OK;
}
/*
delete a xattr
*/
NTSTATUS delete_xattr_system(struct pvfs_state *pvfs, const char *attr_name,
const char *fname, int fd)
{
int ret;
if (fd != -1) {
ret = fremovexattr(fd, attr_name);
} else {
ret = removexattr(fname, attr_name);
}
if (ret == -1) {
return pvfs_map_errno(pvfs, errno);
}
return NT_STATUS_OK;
}
/*
unlink a file - cleanup any xattrs
*/
NTSTATUS unlink_xattr_system(struct pvfs_state *pvfs, const char *fname)
{
/* nothing needs to be done for filesystem based xattrs */
return NT_STATUS_OK;
}
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