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|
/*
* implementation of an Shadow Copy module - version 2
*
* Copyright (C) Andrew Tridgell 2007
*
* 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"
/*
This is a 2nd implemetation of a shadow copy module for exposing
snapshots to windows clients as shadow copies. This version has the
following features:
1) you don't need to populate your shares with symlinks to the
snapshots. This can be very important when you have thousands of
shares, or use [homes]
2) the inode number of the files is altered so it is different
from the original. This allows the 'restore' button to work
without a sharing violation
Module options:
shadow:snapdir = <directory where snapshots are kept>
This is the directory containing the @GMT-* snapshot directories. If it is an absolute
path it is used as-is. If it is a relative path, then it is taken relative to the mount
point of the filesystem that the root of this share is on
shadow:basedir = <base directory that snapshots are from>
This is an optional parameter that specifies the directory that
the snapshots are relative to. It defaults to the filesystem
mount point
shadow:fixinodes = yes/no
If you enable shadow:fixinodes then this module will modify the
apparent inode number of files in the snapshot directories using
a hash of the files path. This is needed for snapshot systems
where the snapshots have the same device:inode number as the
original files (such as happens with GPFS snapshots). If you
don't set this option then the 'restore' button in the shadow
copy UI will fail with a sharing violation.
Note that the directory names in the snapshot directory must take the form
@GMT-YYYY.MM.DD-HH.MM.SS
The following command would generate a correctly formatted directory name:
date -u +@GMT-%Y.%m.%d-%H.%M.%S
*/
static int vfs_shadow_copy2_debug_level = DBGC_VFS;
#undef DBGC_CLASS
#define DBGC_CLASS vfs_shadow_copy2_debug_level
#define GMT_NAME_LEN 24 /* length of a @GMT- name */
/*
make very sure it is one of our special names
*/
static inline bool shadow_copy2_match_name(const char *name)
{
unsigned year, month, day, hr, min, sec;
if (name[0] != '@') return False;
if (strncmp(name, "@GMT-", 5) != 0) return False;
if (sscanf(name, "@GMT-%04u.%02u.%02u-%02u.%02u.%02u", &year, &month,
&day, &hr, &min, &sec) != 6) {
return False;
}
if (name[24] != 0 && name[24] != '/') {
return False;
}
return True;
}
/*
convert a name to the shadow directory
*/
#define _SHADOW2_NEXT(op, args, rtype, eret, extra) do { \
const char *name = fname; \
if (shadow_copy2_match_name(fname)) { \
char *name2; \
rtype ret; \
name2 = convert_shadow2_name(handle, fname); \
if (name2 == NULL) { \
errno = EINVAL; \
return eret; \
} \
name = name2; \
ret = SMB_VFS_NEXT_ ## op args; \
talloc_free(name2); \
if (ret != eret) extra; \
return ret; \
} else { \
return SMB_VFS_NEXT_ ## op args; \
} \
} while (0)
/*
convert a name to the shadow directory: NTSTATUS-specific handling
*/
#define _SHADOW2_NTSTATUS_NEXT(op, args, eret, extra) do { \
const char *name = fname; \
if (shadow_copy2_match_name(fname)) { \
char *name2; \
NTSTATUS ret; \
name2 = convert_shadow2_name(handle, fname); \
if (name2 == NULL) { \
errno = EINVAL; \
return eret; \
} \
name = name2; \
ret = SMB_VFS_NEXT_ ## op args; \
talloc_free(name2); \
if (!NT_STATUS_EQUAL(ret, eret)) extra; \
return ret; \
} else { \
return SMB_VFS_NEXT_ ## op args; \
} \
} while (0)
#define SHADOW2_NTSTATUS_NEXT(op, args, eret) _SHADOW2_NTSTATUS_NEXT(op, args, eret, )
#define SHADOW2_NEXT(op, args, rtype, eret) _SHADOW2_NEXT(op, args, rtype, eret, )
#define SHADOW2_NEXT2(op, args) do { \
if (shadow_copy2_match_name(oldname) || shadow_copy2_match_name(newname)) { \
errno = EROFS; \
return -1; \
} else { \
return SMB_VFS_NEXT_ ## op args; \
} \
} while (0)
/*
find the mount point of a filesystem
*/
static char *find_mount_point(TALLOC_CTX *mem_ctx, vfs_handle_struct *handle)
{
char *path = talloc_strdup(mem_ctx, handle->conn->connectpath);
dev_t dev;
struct stat st;
char *p;
if (stat(path, &st) != 0) {
talloc_free(path);
return NULL;
}
dev = st.st_dev;
while ((p = strrchr(path, '/')) && p > path) {
*p = 0;
if (stat(path, &st) != 0) {
talloc_free(path);
return NULL;
}
if (st.st_dev != dev) {
*p = '/';
break;
}
}
return path;
}
/*
work out the location of the snapshot for this share
*/
static const char *shadow_copy2_find_snapdir(TALLOC_CTX *mem_ctx, vfs_handle_struct *handle)
{
const char *snapdir;
char *mount_point;
const char *ret;
snapdir = lp_parm_const_string(SNUM(handle->conn), "shadow", "snapdir", NULL);
if (snapdir == NULL) {
return NULL;
}
/* if its an absolute path, we're done */
if (*snapdir == '/') {
return snapdir;
}
/* other its relative to the filesystem mount point */
mount_point = find_mount_point(mem_ctx, handle);
if (mount_point == NULL) {
return NULL;
}
ret = talloc_asprintf(mem_ctx, "%s/%s", mount_point, snapdir);
talloc_free(mount_point);
return ret;
}
/*
work out the location of the base directory for snapshots of this share
*/
static const char *shadow_copy2_find_basedir(TALLOC_CTX *mem_ctx, vfs_handle_struct *handle)
{
const char *basedir = lp_parm_const_string(SNUM(handle->conn), "shadow", "basedir", NULL);
/* other its the filesystem mount point */
if (basedir == NULL) {
basedir = find_mount_point(mem_ctx, handle);
}
return basedir;
}
/*
convert a filename from a share relative path, to a path in the
snapshot directory
*/
static char *convert_shadow2_name(vfs_handle_struct *handle, const char *fname)
{
TALLOC_CTX *tmp_ctx = talloc_new(handle->data);
const char *snapdir, *relpath, *baseoffset, *basedir;
size_t baselen;
char *ret;
snapdir = shadow_copy2_find_snapdir(tmp_ctx, handle);
if (snapdir == NULL) {
DEBUG(2,("no snapdir found for share at %s\n", handle->conn->connectpath));
talloc_free(tmp_ctx);
return NULL;
}
basedir = shadow_copy2_find_basedir(tmp_ctx, handle);
if (basedir == NULL) {
DEBUG(2,("no basedir found for share at %s\n", handle->conn->connectpath));
talloc_free(tmp_ctx);
return NULL;
}
relpath = fname + GMT_NAME_LEN;
baselen = strlen(basedir);
baseoffset = handle->conn->connectpath + baselen;
/* some sanity checks */
if (strncmp(basedir, handle->conn->connectpath, baselen) != 0 ||
(handle->conn->connectpath[baselen] != 0 && handle->conn->connectpath[baselen] != '/')) {
DEBUG(0,("convert_shadow2_name: basedir %s is not a parent of %s\n",
basedir, handle->conn->connectpath));
talloc_free(tmp_ctx);
return NULL;
}
if (*relpath == '/') relpath++;
if (*baseoffset == '/') baseoffset++;
ret = talloc_asprintf(handle->data, "%s/%.*s/%s/%s",
snapdir,
GMT_NAME_LEN, fname,
baseoffset,
relpath);
DEBUG(6,("convert_shadow2_name: '%s' -> '%s'\n", fname, ret));
talloc_free(tmp_ctx);
return ret;
}
/*
simple string hash
*/
static uint32 string_hash(const char *s)
{
uint32 n = 0;
while (*s) {
n = ((n << 5) + n) ^ (uint32)(*s++);
}
return n;
}
/*
modify a sbuf return to ensure that inodes in the shadow directory
are different from those in the main directory
*/
static void convert_sbuf(vfs_handle_struct *handle, const char *fname, SMB_STRUCT_STAT *sbuf)
{
if (lp_parm_bool(SNUM(handle->conn), "shadow", "fixinodes", False)) {
/* some snapshot systems, like GPFS, return the name
device:inode for the snapshot files as the current
files. That breaks the 'restore' button in the shadow copy
GUI, as the client gets a sharing violation.
This is a crude way of allowing both files to be
open at once. It has a slight chance of inode
number collision, but I can't see a better approach
without significant VFS changes
*/
uint32_t shash = string_hash(fname) & 0xFF000000;
if (shash == 0) {
shash = 1;
}
sbuf->st_ino ^= shash;
}
}
static int shadow_copy2_rename(vfs_handle_struct *handle,
const char *oldname, const char *newname)
{
SHADOW2_NEXT2(RENAME, (handle, oldname, newname));
}
static int shadow_copy2_symlink(vfs_handle_struct *handle,
const char *oldname, const char *newname)
{
SHADOW2_NEXT2(SYMLINK, (handle, oldname, newname));
}
static int shadow_copy2_link(vfs_handle_struct *handle,
const char *oldname, const char *newname)
{
SHADOW2_NEXT2(LINK, (handle, oldname, newname));
}
static int shadow_copy2_open(vfs_handle_struct *handle,
const char *fname, files_struct *fsp, int flags, mode_t mode)
{
SHADOW2_NEXT(OPEN, (handle, name, fsp, flags, mode), int, -1);
}
static SMB_STRUCT_DIR *shadow_copy2_opendir(vfs_handle_struct *handle,
const char *fname, const char *mask, uint32 attr)
{
SHADOW2_NEXT(OPENDIR, (handle, name, mask, attr), SMB_STRUCT_DIR *, NULL);
}
static int shadow_copy2_stat(vfs_handle_struct *handle,
const char *fname, SMB_STRUCT_STAT *sbuf)
{
_SHADOW2_NEXT(STAT, (handle, name, sbuf), int, -1, convert_sbuf(handle, fname, sbuf));
}
static int shadow_copy2_lstat(vfs_handle_struct *handle,
const char *fname, SMB_STRUCT_STAT *sbuf)
{
_SHADOW2_NEXT(LSTAT, (handle, name, sbuf), int, -1, convert_sbuf(handle, fname, sbuf));
}
static int shadow_copy2_fstat(vfs_handle_struct *handle, files_struct *fsp, SMB_STRUCT_STAT *sbuf)
{
int ret = SMB_VFS_NEXT_FSTAT(handle, fsp, sbuf);
if (ret == 0 && shadow_copy2_match_name(fsp->fsp_name)) {
convert_sbuf(handle, fsp->fsp_name, sbuf);
}
return ret;
}
static int shadow_copy2_unlink(vfs_handle_struct *handle, const char *fname)
{
SHADOW2_NEXT(UNLINK, (handle, name), int, -1);
}
static int shadow_copy2_chmod(vfs_handle_struct *handle,
const char *fname, mode_t mode)
{
SHADOW2_NEXT(CHMOD, (handle, name, mode), int, -1);
}
static int shadow_copy2_chown(vfs_handle_struct *handle,
const char *fname, uid_t uid, gid_t gid)
{
SHADOW2_NEXT(CHOWN, (handle, name, uid, gid), int, -1);
}
static int shadow_copy2_chdir(vfs_handle_struct *handle,
const char *fname)
{
SHADOW2_NEXT(CHDIR, (handle, name), int, -1);
}
static int shadow_copy2_ntimes(vfs_handle_struct *handle,
const char *fname, struct smb_file_time *ft)
{
SHADOW2_NEXT(NTIMES, (handle, name, ft), int, -1);
}
static int shadow_copy2_readlink(vfs_handle_struct *handle,
const char *fname, char *buf, size_t bufsiz)
{
SHADOW2_NEXT(READLINK, (handle, name, buf, bufsiz), int, -1);
}
static int shadow_copy2_mknod(vfs_handle_struct *handle,
const char *fname, mode_t mode, SMB_DEV_T dev)
{
SHADOW2_NEXT(MKNOD, (handle, name, mode, dev), int, -1);
}
static char *shadow_copy2_realpath(vfs_handle_struct *handle,
const char *fname, char *resolved_path)
{
SHADOW2_NEXT(REALPATH, (handle, name, resolved_path), char *, NULL);
}
static NTSTATUS shadow_copy2_get_nt_acl(vfs_handle_struct *handle,
const char *fname, uint32 security_info,
struct security_descriptor **ppdesc)
{
SHADOW2_NTSTATUS_NEXT(GET_NT_ACL, (handle, name, security_info, ppdesc), NT_STATUS_ACCESS_DENIED);
}
static int shadow_copy2_mkdir(vfs_handle_struct *handle, const char *fname, mode_t mode)
{
SHADOW2_NEXT(MKDIR, (handle, name, mode), int, -1);
}
static int shadow_copy2_rmdir(vfs_handle_struct *handle, const char *fname)
{
SHADOW2_NEXT(RMDIR, (handle, name), int, -1);
}
static int shadow_copy2_chflags(vfs_handle_struct *handle, const char *fname, int flags)
{
SHADOW2_NEXT(CHFLAGS, (handle, name, flags), int, -1);
}
static ssize_t shadow_copy2_getxattr(vfs_handle_struct *handle,
const char *fname, const char *aname, void *value, size_t size)
{
SHADOW2_NEXT(GETXATTR, (handle, name, aname, value, size), ssize_t, -1);
}
static ssize_t shadow_copy2_lgetxattr(vfs_handle_struct *handle,
const char *fname, const char *aname, void *value, size_t size)
{
SHADOW2_NEXT(LGETXATTR, (handle, name, aname, value, size), ssize_t, -1);
}
static ssize_t shadow_copy2_listxattr(struct vfs_handle_struct *handle, const char *fname,
char *list, size_t size)
{
SHADOW2_NEXT(LISTXATTR, (handle, name, list, size), ssize_t, -1);
}
static int shadow_copy2_removexattr(struct vfs_handle_struct *handle, const char *fname,
const char *aname)
{
SHADOW2_NEXT(REMOVEXATTR, (handle, name, aname), int, -1);
}
static int shadow_copy2_lremovexattr(struct vfs_handle_struct *handle, const char *fname,
const char *aname)
{
SHADOW2_NEXT(LREMOVEXATTR, (handle, name, aname), int, -1);
}
static int shadow_copy2_setxattr(struct vfs_handle_struct *handle, const char *fname,
const char *aname, const void *value, size_t size, int flags)
{
SHADOW2_NEXT(SETXATTR, (handle, name, aname, value, size, flags), int, -1);
}
static int shadow_copy2_lsetxattr(struct vfs_handle_struct *handle, const char *fname,
const char *aname, const void *value, size_t size, int flags)
{
SHADOW2_NEXT(LSETXATTR, (handle, name, aname, value, size, flags), int, -1);
}
static int shadow_copy2_chmod_acl(vfs_handle_struct *handle,
const char *fname, mode_t mode)
{
/* If the underlying VFS doesn't have ACL support... */
if (!handle->vfs_next.ops.chmod_acl) {
errno = ENOSYS;
return -1;
}
SHADOW2_NEXT(CHMOD_ACL, (handle, name, mode), int, -1);
}
static int shadow_copy2_get_shadow_copy2_data(vfs_handle_struct *handle,
files_struct *fsp,
SHADOW_COPY_DATA *shadow_copy2_data,
bool labels)
{
SMB_STRUCT_DIR *p;
const char *snapdir;
SMB_STRUCT_DIRENT *d;
TALLOC_CTX *tmp_ctx = talloc_new(handle->data);
snapdir = shadow_copy2_find_snapdir(tmp_ctx, handle);
if (snapdir == NULL) {
DEBUG(0,("shadow:snapdir not found for %s in get_shadow_copy_data\n",
handle->conn->connectpath));
errno = EINVAL;
talloc_free(tmp_ctx);
return -1;
}
p = SMB_VFS_NEXT_OPENDIR(handle, snapdir, NULL, 0);
if (!p) {
DEBUG(0,("shadow_copy2: SMB_VFS_NEXT_OPENDIR() failed for '%s' - %s\n",
snapdir, strerror(errno)));
talloc_free(tmp_ctx);
return -1;
}
talloc_free(tmp_ctx);
shadow_copy2_data->num_volumes = 0;
shadow_copy2_data->labels = NULL;
while ((d = SMB_VFS_NEXT_READDIR(handle, p))) {
SHADOW_COPY_LABEL *tlabels;
/* ignore names not of the right form in the snapshot directory */
if (!shadow_copy2_match_name(d->d_name)) {
continue;
}
if (!labels) {
/* the caller doesn't want the labels */
shadow_copy2_data->num_volumes++;
continue;
}
tlabels = talloc_realloc(shadow_copy2_data->mem_ctx,
shadow_copy2_data->labels,
SHADOW_COPY_LABEL, shadow_copy2_data->num_volumes+1);
if (tlabels == NULL) {
DEBUG(0,("shadow_copy2: out of memory\n"));
SMB_VFS_NEXT_CLOSEDIR(handle, p);
return -1;
}
strlcpy(tlabels[shadow_copy2_data->num_volumes], d->d_name, sizeof(*tlabels));
shadow_copy2_data->num_volumes++;
shadow_copy2_data->labels = tlabels;
}
SMB_VFS_NEXT_CLOSEDIR(handle,p);
return 0;
}
/* VFS operations structure */
static vfs_op_tuple shadow_copy2_ops[] = {
{SMB_VFS_OP(shadow_copy2_opendir), SMB_VFS_OP_OPENDIR, SMB_VFS_LAYER_TRANSPARENT},
/* directory operations */
{SMB_VFS_OP(shadow_copy2_mkdir), SMB_VFS_OP_MKDIR, SMB_VFS_LAYER_TRANSPARENT},
{SMB_VFS_OP(shadow_copy2_rmdir), SMB_VFS_OP_RMDIR, SMB_VFS_LAYER_TRANSPARENT},
/* xattr and flags operations */
{SMB_VFS_OP(shadow_copy2_chflags), SMB_VFS_OP_CHFLAGS, SMB_VFS_LAYER_TRANSPARENT},
{SMB_VFS_OP(shadow_copy2_getxattr), SMB_VFS_OP_GETXATTR, SMB_VFS_LAYER_TRANSPARENT},
{SMB_VFS_OP(shadow_copy2_lgetxattr), SMB_VFS_OP_LGETXATTR, SMB_VFS_LAYER_TRANSPARENT},
{SMB_VFS_OP(shadow_copy2_listxattr), SMB_VFS_OP_LISTXATTR, SMB_VFS_LAYER_TRANSPARENT},
{SMB_VFS_OP(shadow_copy2_removexattr), SMB_VFS_OP_REMOVEXATTR, SMB_VFS_LAYER_TRANSPARENT},
{SMB_VFS_OP(shadow_copy2_lremovexattr),SMB_VFS_OP_LREMOVEXATTR,SMB_VFS_LAYER_TRANSPARENT},
{SMB_VFS_OP(shadow_copy2_setxattr), SMB_VFS_OP_SETXATTR, SMB_VFS_LAYER_TRANSPARENT},
{SMB_VFS_OP(shadow_copy2_lsetxattr), SMB_VFS_OP_LSETXATTR, SMB_VFS_LAYER_TRANSPARENT},
/* File operations */
{SMB_VFS_OP(shadow_copy2_open), SMB_VFS_OP_OPEN, SMB_VFS_LAYER_TRANSPARENT},
{SMB_VFS_OP(shadow_copy2_rename), SMB_VFS_OP_RENAME, SMB_VFS_LAYER_TRANSPARENT},
{SMB_VFS_OP(shadow_copy2_stat), SMB_VFS_OP_STAT, SMB_VFS_LAYER_TRANSPARENT},
{SMB_VFS_OP(shadow_copy2_lstat), SMB_VFS_OP_LSTAT, SMB_VFS_LAYER_TRANSPARENT},
{SMB_VFS_OP(shadow_copy2_fstat), SMB_VFS_OP_FSTAT, SMB_VFS_LAYER_TRANSPARENT},
{SMB_VFS_OP(shadow_copy2_unlink), SMB_VFS_OP_UNLINK, SMB_VFS_LAYER_TRANSPARENT},
{SMB_VFS_OP(shadow_copy2_chmod), SMB_VFS_OP_CHMOD, SMB_VFS_LAYER_TRANSPARENT},
{SMB_VFS_OP(shadow_copy2_chown), SMB_VFS_OP_CHOWN, SMB_VFS_LAYER_TRANSPARENT},
{SMB_VFS_OP(shadow_copy2_chdir), SMB_VFS_OP_CHDIR, SMB_VFS_LAYER_TRANSPARENT},
{SMB_VFS_OP(shadow_copy2_ntimes), SMB_VFS_OP_NTIMES, SMB_VFS_LAYER_TRANSPARENT},
{SMB_VFS_OP(shadow_copy2_symlink), SMB_VFS_OP_SYMLINK, SMB_VFS_LAYER_TRANSPARENT},
{SMB_VFS_OP(shadow_copy2_readlink), SMB_VFS_OP_READLINK, SMB_VFS_LAYER_TRANSPARENT},
{SMB_VFS_OP(shadow_copy2_link), SMB_VFS_OP_LINK, SMB_VFS_LAYER_TRANSPARENT},
{SMB_VFS_OP(shadow_copy2_mknod), SMB_VFS_OP_MKNOD, SMB_VFS_LAYER_TRANSPARENT},
{SMB_VFS_OP(shadow_copy2_realpath), SMB_VFS_OP_REALPATH, SMB_VFS_LAYER_TRANSPARENT},
/* NT File ACL operations */
{SMB_VFS_OP(shadow_copy2_get_nt_acl), SMB_VFS_OP_GET_NT_ACL, SMB_VFS_LAYER_TRANSPARENT},
/* POSIX ACL operations */
{SMB_VFS_OP(shadow_copy2_chmod_acl), SMB_VFS_OP_CHMOD_ACL, SMB_VFS_LAYER_TRANSPARENT},
/* special shadown copy op */
{SMB_VFS_OP(shadow_copy2_get_shadow_copy2_data),
SMB_VFS_OP_GET_SHADOW_COPY_DATA,SMB_VFS_LAYER_OPAQUE},
{SMB_VFS_OP(NULL), SMB_VFS_OP_NOOP, SMB_VFS_LAYER_NOOP}
};
NTSTATUS vfs_shadow_copy2_init(void);
NTSTATUS vfs_shadow_copy2_init(void)
{
NTSTATUS ret;
ret = smb_register_vfs(SMB_VFS_INTERFACE_VERSION, "shadow_copy2", shadow_copy2_ops);
if (!NT_STATUS_IS_OK(ret))
return ret;
vfs_shadow_copy2_debug_level = debug_add_class("shadow_copy2");
if (vfs_shadow_copy2_debug_level == -1) {
vfs_shadow_copy2_debug_level = DBGC_VFS;
DEBUG(0, ("%s: Couldn't register custom debugging class!\n",
"vfs_shadow_copy2_init"));
} else {
DEBUG(10, ("%s: Debug class number of '%s': %d\n",
"vfs_shadow_copy2_init","shadow_copy2",vfs_shadow_copy2_debug_level));
}
return ret;
}
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