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/*
Unix SMB/CIFS implementation.
POSIX NTVFS backend - xattr support
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 2 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, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include "includes.h"
#include "system/filesys.h"
#include "vfs_posix.h"
#include "librpc/gen_ndr/ndr_xattr.h"
/*
pull a xattr as a blob, from either a file or a file descriptor
*/
static NTSTATUS pull_xattr_blob(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);
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, estimated_size);
if (blob->data == NULL) {
return NT_STATUS_NO_MEMORY;
}
blob->length = estimated_size;
goto again;
}
if (ret == -1) {
data_blob_free(blob);
return map_nt_error_from_unix(errno);
}
blob->length = ret;
return NT_STATUS_OK;
}
/*
push a xattr as a blob, from either a file or a file descriptor
*/
static NTSTATUS push_xattr_blob(TALLOC_CTX *mem_ctx,
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 map_nt_error_from_unix(errno);
}
return NT_STATUS_OK;
}
/*
fill in file attributes from extended attributes
*/
NTSTATUS pvfs_xattr_load(struct pvfs_state *pvfs, struct pvfs_filename *name, int fd)
{
DATA_BLOB blob;
NTSTATUS status;
struct xattr_DosAttrib attrib;
TALLOC_CTX *mem_ctx = talloc(name, 0);
struct xattr_DosInfo1 *info1;
status = pull_xattr_blob(mem_ctx, XATTR_DOSATTRIB_NAME, name->full_name,
fd, XATTR_DOSATTRIB_ESTIMATED_SIZE, &blob);
/* if the filesystem doesn't support them, then tell pvfs not to try again */
if (NT_STATUS_EQUAL(status, NT_STATUS_NOT_SUPPORTED)) {
DEBUG(5,("pvfs_xattr: xattr not supported in filesystem\n"));
pvfs->flags &= ~PVFS_FLAG_XATTR_ENABLE;
talloc_free(mem_ctx);
return NT_STATUS_OK;
}
/* not having a DosAttrib is not an error */
if (NT_STATUS_EQUAL(status, NT_STATUS_NOT_FOUND)) {
talloc_free(mem_ctx);
return NT_STATUS_OK;
}
if (!NT_STATUS_IS_OK(status)) {
talloc_free(mem_ctx);
return status;
}
/* pull the blob */
status = ndr_pull_struct_blob(&blob, mem_ctx, &attrib,
(ndr_pull_flags_fn_t)ndr_pull_xattr_DosAttrib);
if (!NT_STATUS_IS_OK(status)) {
talloc_free(mem_ctx);
return status;
}
switch (attrib.version) {
case 1:
info1 = &attrib.info.info1;
name->dos.attrib = info1->attrib;
name->dos.ea_size = info1->ea_size;
if (name->st.st_size == info1->size) {
name->dos.alloc_size = info1->alloc_size;
}
if (info1->create_time != 0) {
name->dos.create_time = info1->create_time;
}
if (info1->change_time != 0) {
name->dos.change_time = info1->change_time;
}
break;
default:
DEBUG(0,("ERROR: Unsupported xattr DosAttrib version %d on '%s'\n",
attrib.version, name->full_name));
talloc_free(mem_ctx);
return NT_STATUS_INVALID_LEVEL;
}
talloc_free(mem_ctx);
return NT_STATUS_OK;
}
/*
save the file attribute into into the xattr
*/
NTSTATUS pvfs_xattr_save(struct pvfs_state *pvfs, struct pvfs_filename *name, int fd)
{
struct xattr_DosAttrib attrib;
struct xattr_DosInfo1 *info1;
TALLOC_CTX *mem_ctx = talloc(name, 0);
DATA_BLOB blob;
NTSTATUS status;
attrib.version = 1;
info1 = &attrib.info.info1;
info1->attrib = name->dos.attrib;
info1->ea_size = name->dos.ea_size;
info1->size = name->st.st_size;
info1->alloc_size = name->dos.alloc_size;
info1->create_time = name->dos.create_time;
info1->change_time = name->dos.change_time;
status = ndr_push_struct_blob(&blob, mem_ctx, &attrib,
(ndr_push_flags_fn_t)ndr_push_xattr_DosAttrib);
if (!NT_STATUS_IS_OK(status)) {
talloc_free(mem_ctx);
return status;
}
status = push_xattr_blob(mem_ctx, XATTR_DOSATTRIB_NAME, name->full_name, fd, &blob);
talloc_free(mem_ctx);
return status;
}
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