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vfs_shadow_copy2: implement SMB_VFS_OPENAT()

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Signed-off-by: Ralph Boehme <slow@samba.org>
Reviewed-by: Jeremy Allison <jra@samba.org>
This commit is contained in:
Ralph Boehme 2020-05-20 23:03:05 +02:00 committed by Jeremy Allison
parent df7882dd08
commit d14696f1b9
1 changed files with 88 additions and 0 deletions
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88
source3/modules/vfs_shadow_copy2.c
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@ -1381,6 +1381,93 @@ static int shadow_copy2_open(vfs_handle_struct *handle,
return ret;
}
static int shadow_copy2_openat(vfs_handle_struct *handle,
const struct files_struct *dirfsp,
const struct smb_filename *smb_fname_in,
struct files_struct *fsp,
int flags,
mode_t mode)
{
struct smb_filename *smb_fname = NULL;
time_t timestamp = 0;
char *stripped = NULL;
bool is_converted = false;
int saved_errno = 0;
int ret;
bool ok;
ok = shadow_copy2_strip_snapshot_converted(talloc_tos(),
handle,
smb_fname_in,
&timestamp,
&stripped,
&is_converted);
if (!ok) {
return -1;
}
if (timestamp == 0) {
if (is_converted) {
/*
* Just pave over the user requested mode and use
* O_RDONLY. Later attempts by the client to write on
* the handle will fail in the pwrite() syscall with
* EINVAL which we carefully map to EROFS. In sum, this
* matches Windows behaviour.
*/
flags = O_RDONLY;
}
return SMB_VFS_NEXT_OPENAT(handle,
dirfsp,
smb_fname_in,
fsp,
flags,
mode);
}
smb_fname = cp_smb_filename(talloc_tos(), smb_fname_in);
if (smb_fname == NULL) {
TALLOC_FREE(stripped);
errno = ENOMEM;
return -1;
}
smb_fname->base_name = shadow_copy2_convert(smb_fname,
handle,
stripped,
timestamp);
TALLOC_FREE(stripped);
if (smb_fname->base_name == NULL) {
TALLOC_FREE(smb_fname);
errno = ENOMEM;
return -1;
}
/*
* Just pave over the user requested mode and use O_RDONLY. Later
* attempts by the client to write on the handle will fail in the
* pwrite() syscall with EINVAL which we carefully map to EROFS. In sum,
* this matches Windows behaviour.
*/
flags = O_RDONLY;
ret = SMB_VFS_NEXT_OPENAT(handle,
dirfsp,
smb_fname,
fsp,
flags,
mode);
if (ret == -1) {
saved_errno = errno;
}
TALLOC_FREE(smb_fname);
if (saved_errno != 0) {
errno = saved_errno;
}
return ret;
}
static int shadow_copy2_unlinkat(vfs_handle_struct *handle,
struct files_struct *dirfsp,
const struct smb_filename *smb_fname,
@ -3160,6 +3247,7 @@ static struct vfs_fn_pointers vfs_shadow_copy2_fns = {
.lstat_fn = shadow_copy2_lstat,
.fstat_fn = shadow_copy2_fstat,
.open_fn = shadow_copy2_open,
.openat_fn = shadow_copy2_openat,
.unlinkat_fn = shadow_copy2_unlinkat,
.chmod_fn = shadow_copy2_chmod,
.chdir_fn = shadow_copy2_chdir,