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samba-mirror/source3/modules/vfs_shadow_copy2.c
MikeLiu f392fdfd47 shadow_copy2: Add missing TALLOC_FREE 
Signed-off-by: MikeLiu <mikeliu@qnap.com>
Reviewed-by: Joseph Sutton <josephsutton@catalyst.net.nz>
Reviewed-by: Andrew Bartlett <abartlet@samba.org>

Autobuild-User(master): Andrew Bartlett <abartlet@samba.org>
Autobuild-Date(master): Tue Oct 17 20:22:18 UTC 2023 on atb-devel-224
2023-10-17 20:22:18 +00:00

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/*
* shadow_copy2: a shadow copy module (second implementation)
*
* Copyright (C) Andrew Tridgell 2007 (portions taken from shadow_copy2)
* Copyright (C) Ed Plese 2009
* Copyright (C) Volker Lendecke 2011
* Copyright (C) Christian Ambach 2011
* Copyright (C) Michael Adam 2013
* Copyright (C) Rajesh Joseph 2016
*
* 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.
*/
/*
* This is a second implementation of a shadow copy module for exposing
* file system snapshots to windows clients as shadow copies.
*
* See the manual page for documentation.
*/
#include "includes.h"
#include "smbd/smbd.h"
#include "system/filesys.h"
#include "include/ntioctl.h"
#include "util_tdb.h"
#include "lib/util_path.h"
#include "libcli/security/security.h"
#include "lib/util/tevent_unix.h"
struct shadow_copy2_config {
char *gmt_format;
bool use_sscanf;
bool use_localtime;
char *snapdir;
char *delimiter;
bool snapdirseverywhere;
bool crossmountpoints;
bool fixinodes;
char *sort_order;
bool snapdir_absolute;
char *mount_point;
char *rel_connectpath; /* share root, relative to a snapshot root */
char *snapshot_basepath; /* the absolute version of snapdir */
};
/* Data-structure to hold the list of snap entries */
struct shadow_copy2_snapentry {
char *snapname;
char *time_fmt;
struct shadow_copy2_snapentry *next;
struct shadow_copy2_snapentry *prev;
};
struct shadow_copy2_snaplist_info {
struct shadow_copy2_snapentry *snaplist; /* snapshot list */
regex_t *regex; /* Regex to filter snaps */
time_t fetch_time; /* snaplist update time */
};
/*
* shadow_copy2 private structure. This structure will be
* used to keep module specific information
*/
struct shadow_copy2_private {
struct shadow_copy2_config *config;
struct shadow_copy2_snaplist_info *snaps;
char *shadow_cwd; /* Absolute $cwd path. */
/* Absolute connectpath - can vary depending on $cwd. */
char *shadow_connectpath;
/* talloc'ed realpath return. */
struct smb_filename *shadow_realpath;
};
static int shadow_copy2_get_shadow_copy_data(
vfs_handle_struct *handle, files_struct *fsp,
struct shadow_copy_data *shadow_copy2_data,
bool labels);
/**
* This function will create a new snapshot list entry and
* return to the caller. This entry will also be added to
* the global snapshot list.
*
* @param[in] priv shadow_copy2 specific data structure
* @return Newly created snapshot entry or NULL on failure
*/
static struct shadow_copy2_snapentry *shadow_copy2_create_snapentry(
struct shadow_copy2_private *priv)
{
struct shadow_copy2_snapentry *tmpentry = NULL;
tmpentry = talloc_zero(priv->snaps, struct shadow_copy2_snapentry);
if (tmpentry == NULL) {
DBG_ERR("talloc_zero() failed\n");
errno = ENOMEM;
return NULL;
}
DLIST_ADD(priv->snaps->snaplist, tmpentry);
return tmpentry;
}
/**
* This function will delete the entire snaplist and reset
* priv->snaps->snaplist to NULL.
*
* @param[in] priv shadow_copye specific data structure
*/
static void shadow_copy2_delete_snaplist(struct shadow_copy2_private *priv)
{
struct shadow_copy2_snapentry *tmp = NULL;
while ((tmp = priv->snaps->snaplist) != NULL) {
DLIST_REMOVE(priv->snaps->snaplist, tmp);
talloc_free(tmp);
}
}
/**
* Given a timestamp this function searches the global snapshot list
* and returns the complete snapshot directory name saved in the entry.
*
* @param[in] priv shadow_copy2 specific structure
* @param[in] timestamp timestamp corresponding to one of the snapshot
* @param[out] snap_str buffer to copy the actual snapshot name
* @param[in] len length of snap_str buffer
*
* @return Length of actual snapshot name, and -1 on failure
*/
static ssize_t shadow_copy2_saved_snapname(struct shadow_copy2_private *priv,
struct tm *timestamp,
char *snap_str, size_t len)
{
ssize_t snaptime_len = -1;
struct shadow_copy2_snapentry *entry = NULL;
snaptime_len = strftime(snap_str, len, GMT_FORMAT, timestamp);
if (snaptime_len == 0) {
DBG_ERR("strftime failed\n");
return -1;
}
snaptime_len = -1;
for (entry = priv->snaps->snaplist; entry; entry = entry->next) {
if (strcmp(entry->time_fmt, snap_str) == 0) {
snaptime_len = snprintf(snap_str, len, "%s",
entry->snapname);
return snaptime_len;
}
}
snap_str[0] = 0;
return snaptime_len;
}
/**
* This function will check if snaplist is updated or not. If snaplist
* is empty then it will create a new list. Each time snaplist is updated
* the time is recorded. If the snapshot time is greater than the snaplist
* update time then chances are we are working on an older list. Then discard
* the old list and fetch a new snaplist.
*
* @param[in] handle VFS handle struct
* @param[in] snap_time time of snapshot
*
* @return true if the list is updated else false
*/
static bool shadow_copy2_update_snaplist(struct vfs_handle_struct *handle,
time_t snap_time)
{
int ret = -1;
bool snaplist_updated = false;
struct files_struct fsp = {0};
struct smb_filename smb_fname = {0};
double seconds = 0.0;
struct shadow_copy2_private *priv = NULL;
SMB_VFS_HANDLE_GET_DATA(handle, priv, struct shadow_copy2_private,
return false);
seconds = difftime(snap_time, priv->snaps->fetch_time);
/*
* Fetch the snapshot list if either the snaplist is empty or the
* required snapshot time is greater than the last fetched snaplist
* time.
*/
if (seconds > 0 || (priv->snaps->snaplist == NULL)) {
smb_fname.base_name = discard_const_p(char, ".");
fsp.fsp_name = &smb_fname;
ret = shadow_copy2_get_shadow_copy_data(handle, &fsp,
NULL, false);
if (ret == 0) {
snaplist_updated = true;
} else {
DBG_ERR("Failed to get shadow copy data\n");
}
}
return snaplist_updated;
}
static bool shadow_copy2_find_slashes(TALLOC_CTX *mem_ctx, const char *str,
size_t **poffsets,
unsigned *pnum_offsets)
{
unsigned num_offsets;
size_t *offsets;
const char *p;
num_offsets = 0;
p = str;
while ((p = strchr(p, '/')) != NULL) {
num_offsets += 1;
p += 1;
}
offsets = talloc_array(mem_ctx, size_t, num_offsets);
if (offsets == NULL) {
return false;
}
p = str;
num_offsets = 0;
while ((p = strchr(p, '/')) != NULL) {
offsets[num_offsets] = p-str;
num_offsets += 1;
p += 1;
}
*poffsets = offsets;
*pnum_offsets = num_offsets;
return true;
}
/**
* Given a timestamp, build the posix level GMT-tag string
* based on the configurable format.
*/
static ssize_t shadow_copy2_posix_gmt_string(struct vfs_handle_struct *handle,
time_t snapshot,
char *snaptime_string,
size_t len)
{
struct tm snap_tm;
ssize_t snaptime_len;
struct shadow_copy2_config *config;
struct shadow_copy2_private *priv;
SMB_VFS_HANDLE_GET_DATA(handle, priv, struct shadow_copy2_private,
return 0);
config = priv->config;
if (config->use_sscanf) {
snaptime_len = snprintf(snaptime_string,
len,
config->gmt_format,
(unsigned long)snapshot);
if (snaptime_len <= 0) {
DEBUG(10, ("snprintf failed\n"));
return -1;
}
} else {
if (config->use_localtime) {
if (localtime_r(&snapshot, &snap_tm) == 0) {
DEBUG(10, ("gmtime_r failed\n"));
return -1;
}
} else {
if (gmtime_r(&snapshot, &snap_tm) == 0) {
DEBUG(10, ("gmtime_r failed\n"));
return -1;
}
}
if (priv->snaps->regex != NULL) {
snaptime_len = shadow_copy2_saved_snapname(priv,
&snap_tm, snaptime_string, len);
if (snaptime_len >= 0)
return snaptime_len;
/*
* If we fail to find the snapshot name, chances are
* that we have not updated our snaplist. Make sure the
* snaplist is updated.
*/
if (!shadow_copy2_update_snaplist(handle, snapshot)) {
DBG_DEBUG("shadow_copy2_update_snaplist "
"failed\n");
return -1;
}
return shadow_copy2_saved_snapname(priv,
&snap_tm, snaptime_string, len);
}
snaptime_len = strftime(snaptime_string,
len,
config->gmt_format,
&snap_tm);
if (snaptime_len == 0) {
DEBUG(10, ("strftime failed\n"));
return -1;
}
}
return snaptime_len;
}
/**
* Given a timestamp, build the string to insert into a path
* as a path component for creating the local path to the
* snapshot at the given timestamp of the input path.
*
* In the case of a parallel snapdir (specified with an
* absolute path), this is the initial portion of the
* local path of any snapshot file. The complete path is
* obtained by appending the portion of the file's path
* below the share root's mountpoint.
*/
static char *shadow_copy2_insert_string(TALLOC_CTX *mem_ctx,
struct vfs_handle_struct *handle,
time_t snapshot)
{
fstring snaptime_string;
ssize_t snaptime_len = 0;
char *result = NULL;
struct shadow_copy2_config *config;
struct shadow_copy2_private *priv;
SMB_VFS_HANDLE_GET_DATA(handle, priv, struct shadow_copy2_private,
return NULL);
config = priv->config;
snaptime_len = shadow_copy2_posix_gmt_string(handle,
snapshot,
snaptime_string,
sizeof(snaptime_string));
if (snaptime_len <= 0) {
return NULL;
}
if (config->snapdir_absolute) {
result = talloc_asprintf(mem_ctx, "%s/%s",
config->snapdir, snaptime_string);
} else {
result = talloc_asprintf(mem_ctx, "/%s/%s",
config->snapdir, snaptime_string);
}
if (result == NULL) {
DBG_WARNING("talloc_asprintf failed\n");
}
return result;
}
/**
* Build the posix snapshot path for the connection
* at the given timestamp, i.e. the absolute posix path
* that contains the snapshot for this file system.
*
* This only applies to classical case, i.e. not
* to the "snapdirseverywhere" mode.
*/
static char *shadow_copy2_snapshot_path(TALLOC_CTX *mem_ctx,
struct vfs_handle_struct *handle,
time_t snapshot)
{
fstring snaptime_string;
ssize_t snaptime_len = 0;
char *result = NULL;
struct shadow_copy2_private *priv;
SMB_VFS_HANDLE_GET_DATA(handle, priv, struct shadow_copy2_private,
return NULL);
snaptime_len = shadow_copy2_posix_gmt_string(handle,
snapshot,
snaptime_string,
sizeof(snaptime_string));
if (snaptime_len <= 0) {
return NULL;
}
result = talloc_asprintf(mem_ctx, "%s/%s",
priv->config->snapshot_basepath, snaptime_string);
if (result == NULL) {
DBG_WARNING("talloc_asprintf failed\n");
}
return result;
}
static char *make_path_absolute(TALLOC_CTX *mem_ctx,
struct shadow_copy2_private *priv,
const char *name)
{
char *newpath = NULL;
char *abs_path = NULL;
if (name[0] != '/') {
newpath = talloc_asprintf(mem_ctx,
"%s/%s",
priv->shadow_cwd,
name);
if (newpath == NULL) {
return NULL;
}
name = newpath;
}
abs_path = canonicalize_absolute_path(mem_ctx, name);
TALLOC_FREE(newpath);
return abs_path;
}
/* Return a $cwd-relative path. */
static bool make_relative_path(const char *cwd, char *abs_path)
{
size_t cwd_len = strlen(cwd);
size_t abs_len = strlen(abs_path);
if (abs_len < cwd_len) {
return false;
}
if (memcmp(abs_path, cwd, cwd_len) != 0) {
return false;
}
/* The cwd_len != 1 case is for $cwd == '/' */
if (cwd_len != 1 &&
abs_path[cwd_len] != '/' &&
abs_path[cwd_len] != '\0')
{
return false;
}
if (abs_path[cwd_len] == '/') {
cwd_len++;
}
memmove(abs_path, &abs_path[cwd_len], abs_len + 1 - cwd_len);
return true;
}
static bool shadow_copy2_snapshot_to_gmt(vfs_handle_struct *handle,
const char *name,
char *gmt, size_t gmt_len);
/*
* Check if an incoming filename is already a snapshot converted pathname.
*
* If so, it returns the pathname truncated at the snapshot point which
* will be used as the connectpath.
*/
static int check_for_converted_path(TALLOC_CTX *mem_ctx,
struct vfs_handle_struct *handle,
struct shadow_copy2_private *priv,
char *abs_path,
bool *ppath_already_converted,
char **pconnectpath)
{
size_t snapdirlen = 0;
char *p = strstr_m(abs_path, priv->config->snapdir);
char *q = NULL;
char *connect_path = NULL;
char snapshot[GMT_NAME_LEN+1];
*ppath_already_converted = false;
if (p == NULL) {
/* Must at least contain shadow:snapdir. */
return 0;
}
if (priv->config->snapdir[0] == '/' &&
p != abs_path) {
/* Absolute shadow:snapdir must be at the start. */
return 0;
}
snapdirlen = strlen(priv->config->snapdir);
if (p[snapdirlen] != '/') {
/* shadow:snapdir must end as a separate component. */
return 0;
}
if (p > abs_path && p[-1] != '/') {
/* shadow:snapdir must start as a separate component. */
return 0;
}
p += snapdirlen;
p++; /* Move past the / */
/*
* Need to return up to the next path
* component after the time.
* This will be used as the connectpath.
*/
q = strchr(p, '/');
if (q == NULL) {
/*
* No next path component.
* Use entire string.
*/
connect_path = talloc_strdup(mem_ctx,
abs_path);
} else {
connect_path = talloc_strndup(mem_ctx,
abs_path,
q - abs_path);
}
if (connect_path == NULL) {
return ENOMEM;
}
/*
* Point p at the same offset in connect_path as
* it is in abs_path.
*/
p = &connect_path[p - abs_path];
/*
* Now ensure there is a time string at p.
* The SMB-format @GMT-token string is returned
* in snapshot.
*/
if (!shadow_copy2_snapshot_to_gmt(handle,
p,
snapshot,
sizeof(snapshot))) {
TALLOC_FREE(connect_path);
return 0;
}
if (pconnectpath != NULL) {
*pconnectpath = connect_path;
}
*ppath_already_converted = true;
DBG_DEBUG("path |%s| is already converted. "
"connect path = |%s|\n",
abs_path,
connect_path);
return 0;
}
/**
* This function does two things.
*
* 1). Checks if an incoming filename is already a
* snapshot converted pathname.
* If so, it returns the pathname truncated
* at the snapshot point which will be used
* as the connectpath, and then does an early return.
*
* 2). Checks if an incoming filename contains an
* SMB-layer @GMT- style timestamp.
* If so, it strips the timestamp, and returns
* both the timestamp and the stripped path
* (making it cwd-relative).
*/
static bool _shadow_copy2_strip_snapshot_internal(TALLOC_CTX *mem_ctx,
struct vfs_handle_struct *handle,
const struct smb_filename *smb_fname,
time_t *ptimestamp,
char **pstripped,
char **psnappath,
bool *_already_converted,
const char *function)
{
char *stripped = NULL;
struct shadow_copy2_private *priv;
char *abs_path = NULL;
bool ret = true;
bool already_converted = false;
int err = 0;
SMB_VFS_HANDLE_GET_DATA(handle, priv, struct shadow_copy2_private,
return false);
DBG_DEBUG("[from %s()] Path '%s'\n",
function, smb_fname_str_dbg(smb_fname));
if (_already_converted != NULL) {
*_already_converted = false;
}
abs_path = make_path_absolute(mem_ctx, priv, smb_fname->base_name);
if (abs_path == NULL) {
ret = false;
goto out;
}
DBG_DEBUG("abs path '%s'\n", abs_path);
err = check_for_converted_path(mem_ctx,
handle,
priv,
abs_path,
&already_converted,
psnappath);
if (err != 0) {
/* error in conversion. */
ret = false;
goto out;
}
if (already_converted) {
if (_already_converted != NULL) {
*_already_converted = true;
}
goto out;
}
if (smb_fname->twrp == 0) {
goto out;
}
if (ptimestamp != NULL) {
*ptimestamp = nt_time_to_unix(smb_fname->twrp);
}
if (pstripped != NULL) {
stripped = talloc_strdup(mem_ctx, abs_path);
if (stripped == NULL) {
ret = false;
goto out;
}
if (smb_fname->base_name[0] != '/') {
ret = make_relative_path(priv->shadow_cwd, stripped);
if (!ret) {
DBG_DEBUG("Path '%s' "
"doesn't start with cwd '%s'\n",
stripped, priv->shadow_cwd);
ret = false;
errno = ENOENT;
goto out;
}
}
*pstripped = stripped;
}
ret = true;
out:
TALLOC_FREE(abs_path);
return ret;
}
#define shadow_copy2_strip_snapshot_internal(mem_ctx, handle, orig_name, \
ptimestamp, pstripped, psnappath, _already_converted) \
_shadow_copy2_strip_snapshot_internal((mem_ctx), (handle), (orig_name), \
(ptimestamp), (pstripped), (psnappath), (_already_converted), \
__FUNCTION__)
static bool _shadow_copy2_strip_snapshot(TALLOC_CTX *mem_ctx,
struct vfs_handle_struct *handle,
const struct smb_filename *orig_name,
time_t *ptimestamp,
char **pstripped,
const char *function)
{
return _shadow_copy2_strip_snapshot_internal(mem_ctx,
handle,
orig_name,
ptimestamp,
pstripped,
NULL,
NULL,
function);
}
#define shadow_copy2_strip_snapshot(mem_ctx, handle, orig_name, \
ptimestamp, pstripped) \
_shadow_copy2_strip_snapshot((mem_ctx), (handle), (orig_name), \
(ptimestamp), (pstripped), __FUNCTION__)
static bool _shadow_copy2_strip_snapshot_converted(TALLOC_CTX *mem_ctx,
struct vfs_handle_struct *handle,
const struct smb_filename *orig_name,
time_t *ptimestamp,
char **pstripped,
bool *is_converted,
const char *function)
{
return _shadow_copy2_strip_snapshot_internal(mem_ctx,
handle,
orig_name,
ptimestamp,
pstripped,
NULL,
is_converted,
function);
}
#define shadow_copy2_strip_snapshot_converted(mem_ctx, handle, orig_name, \
ptimestamp, pstripped, is_converted) \
_shadow_copy2_strip_snapshot_converted((mem_ctx), (handle), (orig_name), \
(ptimestamp), (pstripped), (is_converted), __FUNCTION__)
static char *shadow_copy2_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;
}
/**
* Convert from a name as handed in via the SMB layer
* and a timestamp into the local path of the snapshot
* of the provided file at the provided time.
* Also return the path in the snapshot corresponding
* to the file's share root.
*/
static char *shadow_copy2_do_convert(TALLOC_CTX *mem_ctx,
struct vfs_handle_struct *handle,
const char *name, time_t timestamp,
size_t *snaproot_len)
{
struct smb_filename converted_fname;
char *result = NULL;
size_t *slashes = NULL;
unsigned num_slashes;
char *path = NULL;
size_t pathlen;
char *insert = NULL;
char *converted = NULL;
size_t insertlen, connectlen = 0;
int saved_errno = 0;
int i;
size_t min_offset;
struct shadow_copy2_config *config;
struct shadow_copy2_private *priv;
size_t in_share_offset = 0;
SMB_VFS_HANDLE_GET_DATA(handle, priv, struct shadow_copy2_private,
return NULL);
config = priv->config;
DEBUG(10, ("converting '%s'\n", name));
if (!config->snapdirseverywhere) {
int ret;
char *snapshot_path;
snapshot_path = shadow_copy2_snapshot_path(talloc_tos(),
handle,
timestamp);
if (snapshot_path == NULL) {
goto fail;
}
if (config->rel_connectpath == NULL) {
converted = talloc_asprintf(mem_ctx, "%s/%s",
snapshot_path, name);
} else {
converted = talloc_asprintf(mem_ctx, "%s/%s/%s",
snapshot_path,
config->rel_connectpath,
name);
}
if (converted == NULL) {
goto fail;
}
converted_fname = (struct smb_filename) {
.base_name = converted,
};
ret = SMB_VFS_NEXT_LSTAT(handle, &converted_fname);
DEBUG(10, ("Trying[not snapdirseverywhere] %s: %d (%s)\n",
converted,
ret, ret == 0 ? "ok" : strerror(errno)));
if (ret == 0) {
DEBUG(10, ("Found %s\n", converted));
result = converted;
converted = NULL;
if (snaproot_len != NULL) {
*snaproot_len = strlen(snapshot_path);
if (config->rel_connectpath != NULL) {
*snaproot_len +=
strlen(config->rel_connectpath) + 1;
}
}
goto fail;
} else {
errno = ENOENT;
goto fail;
}
/* never reached ... */
}
connectlen = strlen(handle->conn->connectpath);
if (name[0] == 0) {
path = talloc_strdup(mem_ctx, handle->conn->connectpath);
} else {
path = talloc_asprintf(
mem_ctx, "%s/%s", handle->conn->connectpath, name);
}
if (path == NULL) {
errno = ENOMEM;
goto fail;
}
pathlen = talloc_get_size(path)-1;
if (!shadow_copy2_find_slashes(talloc_tos(), path,
&slashes, &num_slashes)) {
goto fail;
}
insert = shadow_copy2_insert_string(talloc_tos(), handle, timestamp);
if (insert == NULL) {
goto fail;
}
insertlen = talloc_get_size(insert)-1;
/*
* Note: We deliberately don't expensively initialize the
* array with talloc_zero here: Putting zero into
* converted[pathlen+insertlen] below is sufficient, because
* in the following for loop, the insert string is inserted
* at various slash places. So the memory up to position
* pathlen+insertlen will always be initialized when the
* converted string is used.
*/
converted = talloc_array(mem_ctx, char, pathlen + insertlen + 1);
if (converted == NULL) {
goto fail;
}
if (path[pathlen-1] != '/') {
/*
* Append a fake slash to find the snapshot root
*/
size_t *tmp;
tmp = talloc_realloc(talloc_tos(), slashes,
size_t, num_slashes+1);
if (tmp == NULL) {
goto fail;
}
slashes = tmp;
slashes[num_slashes] = pathlen;
num_slashes += 1;
}
min_offset = 0;
if (!config->crossmountpoints) {
min_offset = strlen(config->mount_point);
}
memcpy(converted, path, pathlen+1);
converted[pathlen+insertlen] = '\0';
converted_fname = (struct smb_filename) {
.base_name = converted,
};
for (i = num_slashes-1; i>=0; i--) {
int ret;
size_t offset;
offset = slashes[i];
if (offset < min_offset) {
errno = ENOENT;
goto fail;
}
if (offset >= connectlen) {
in_share_offset = offset;
}
memcpy(converted+offset, insert, insertlen);
offset += insertlen;
memcpy(converted+offset, path + slashes[i],
pathlen - slashes[i]);
ret = SMB_VFS_NEXT_LSTAT(handle, &converted_fname);
DEBUG(10, ("Trying[snapdirseverywhere] %s: %d (%s)\n",
converted,
ret, ret == 0 ? "ok" : strerror(errno)));
if (ret == 0) {
/* success */
if (snaproot_len != NULL) {
*snaproot_len = in_share_offset + insertlen;
}
break;
}
if (errno == ENOTDIR) {
/*
* This is a valid condition: We appended the
* .snapshots/@GMT.. to a file name. Just try
* with the upper levels.
*/
continue;
}
if (errno != ENOENT) {
/* Other problem than "not found" */
goto fail;
}
}
if (i >= 0) {
/*
* Found something
*/
DEBUG(10, ("Found %s\n", converted));
result = converted;
converted = NULL;
} else {
errno = ENOENT;
}
fail:
if (result == NULL) {
saved_errno = errno;
}
TALLOC_FREE(converted);
TALLOC_FREE(insert);
TALLOC_FREE(slashes);
TALLOC_FREE(path);
if (saved_errno != 0) {
errno = saved_errno;
}
return result;
}
/**
* Convert from a name as handed in via the SMB layer
* and a timestamp into the local path of the snapshot
* of the provided file at the provided time.
*/
static char *shadow_copy2_convert(TALLOC_CTX *mem_ctx,
struct vfs_handle_struct *handle,
const char *name, time_t timestamp)
{
return shadow_copy2_do_convert(mem_ctx, handle, name, timestamp, NULL);
}
/*
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)
{
struct shadow_copy2_private *priv;
SMB_VFS_HANDLE_GET_DATA(handle, priv, struct shadow_copy2_private,
return);
if (priv->config->fixinodes) {
/* some snapshot systems, like GPFS, return the same
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
*/
TDB_DATA key = { .dptr = discard_const_p(uint8_t, fname),
.dsize = strlen(fname) };
uint32_t shash;
shash = tdb_jenkins_hash(&key) & 0xFF000000;
if (shash == 0) {
shash = 1;
}
sbuf->st_ex_ino ^= shash;
}
}
static int shadow_copy2_renameat(vfs_handle_struct *handle,
files_struct *srcfsp,
const struct smb_filename *smb_fname_src,
files_struct *dstfsp,
const struct smb_filename *smb_fname_dst)
{
time_t timestamp_src = 0;
time_t timestamp_dst = 0;
char *snappath_src = NULL;
char *snappath_dst = NULL;
if (!shadow_copy2_strip_snapshot_internal(talloc_tos(), handle,
smb_fname_src,
&timestamp_src, NULL, &snappath_src,
NULL)) {
return -1;
}
if (!shadow_copy2_strip_snapshot_internal(talloc_tos(), handle,
smb_fname_dst,
&timestamp_dst, NULL, &snappath_dst,
NULL)) {
return -1;
}
if (timestamp_src != 0) {
errno = EXDEV;
return -1;
}
if (timestamp_dst != 0) {
errno = EROFS;
return -1;
}
/*
* Don't allow rename on already converted paths.
*/
if (snappath_src != NULL) {
errno = EXDEV;
return -1;
}
if (snappath_dst != NULL) {
errno = EROFS;
return -1;
}
return SMB_VFS_NEXT_RENAMEAT(handle,
srcfsp,
smb_fname_src,
dstfsp,
smb_fname_dst);
}
static int shadow_copy2_symlinkat(vfs_handle_struct *handle,
const struct smb_filename *link_contents,
struct files_struct *dirfsp,
const struct smb_filename *new_smb_fname)
{
time_t timestamp_old = 0;
time_t timestamp_new = 0;
char *snappath_old = NULL;
char *snappath_new = NULL;
if (!shadow_copy2_strip_snapshot_internal(talloc_tos(),
handle,
link_contents,
&timestamp_old,
NULL,
&snappath_old,
NULL)) {
return -1;
}
if (!shadow_copy2_strip_snapshot_internal(talloc_tos(),
handle,
new_smb_fname,
&timestamp_new,
NULL,
&snappath_new,
NULL)) {
return -1;
}
if ((timestamp_old != 0) || (timestamp_new != 0)) {
errno = EROFS;
return -1;
}
/*
* Don't allow symlinks on already converted paths.
*/
if ((snappath_old != NULL) || (snappath_new != NULL)) {
errno = EROFS;
return -1;
}
return SMB_VFS_NEXT_SYMLINKAT(handle,
link_contents,
dirfsp,
new_smb_fname);
}
static int shadow_copy2_linkat(vfs_handle_struct *handle,
files_struct *srcfsp,
const struct smb_filename *old_smb_fname,
files_struct *dstfsp,
const struct smb_filename *new_smb_fname,
int flags)
{
time_t timestamp_old = 0;
time_t timestamp_new = 0;
char *snappath_old = NULL;
char *snappath_new = NULL;
if (!shadow_copy2_strip_snapshot_internal(talloc_tos(),
handle,
old_smb_fname,
&timestamp_old,
NULL,
&snappath_old,
NULL)) {
return -1;
}
if (!shadow_copy2_strip_snapshot_internal(talloc_tos(),
handle,
new_smb_fname,
&timestamp_new,
NULL,
&snappath_new,
NULL)) {
return -1;
}
if ((timestamp_old != 0) || (timestamp_new != 0)) {
errno = EROFS;
return -1;
}
/*
* Don't allow links on already converted paths.
*/
if ((snappath_old != NULL) || (snappath_new != NULL)) {
errno = EROFS;
return -1;
}
return SMB_VFS_NEXT_LINKAT(handle,
srcfsp,
old_smb_fname,
dstfsp,
new_smb_fname,
flags);
}
static int shadow_copy2_stat(vfs_handle_struct *handle,
struct smb_filename *smb_fname)
{
struct shadow_copy2_private *priv = NULL;
time_t timestamp = 0;
char *stripped = NULL;
bool converted = false;
char *abspath = NULL;
char *tmp;
int ret = 0;
SMB_VFS_HANDLE_GET_DATA(handle, priv, struct shadow_copy2_private,
return -1);
if (!shadow_copy2_strip_snapshot_converted(talloc_tos(),
handle,
smb_fname,
&timestamp,
&stripped,
&converted)) {
return -1;
}
if (timestamp == 0) {
TALLOC_FREE(stripped);
ret = SMB_VFS_NEXT_STAT(handle, smb_fname);
if (ret != 0) {
return ret;
}
if (!converted) {
return 0;
}
abspath = make_path_absolute(talloc_tos(),
priv,
smb_fname->base_name);
if (abspath == NULL) {
return -1;
}
convert_sbuf(handle, abspath, &smb_fname->st);
TALLOC_FREE(abspath);
return 0;
}
tmp = smb_fname->base_name;
smb_fname->base_name = shadow_copy2_convert(
talloc_tos(), handle, stripped, timestamp);
TALLOC_FREE(stripped);
if (smb_fname->base_name == NULL) {
smb_fname->base_name = tmp;
return -1;
}
ret = SMB_VFS_NEXT_STAT(handle, smb_fname);
if (ret != 0) {
goto out;
}
abspath = make_path_absolute(talloc_tos(),
priv,
smb_fname->base_name);
if (abspath == NULL) {
ret = -1;
goto out;
}
convert_sbuf(handle, abspath, &smb_fname->st);
TALLOC_FREE(abspath);
out:
TALLOC_FREE(smb_fname->base_name);
smb_fname->base_name = tmp;
return ret;
}
static int shadow_copy2_lstat(vfs_handle_struct *handle,
struct smb_filename *smb_fname)
{
struct shadow_copy2_private *priv = NULL;
time_t timestamp = 0;
char *stripped = NULL;
bool converted = false;
char *abspath = NULL;
char *tmp;
int ret = 0;
SMB_VFS_HANDLE_GET_DATA(handle, priv, struct shadow_copy2_private,
return -1);
if (!shadow_copy2_strip_snapshot_converted(talloc_tos(),
handle,
smb_fname,
&timestamp,
&stripped,
&converted)) {
return -1;
}
if (timestamp == 0) {
TALLOC_FREE(stripped);
ret = SMB_VFS_NEXT_LSTAT(handle, smb_fname);
if (ret != 0) {
return ret;
}
if (!converted) {
return 0;
}
abspath = make_path_absolute(talloc_tos(),
priv,
smb_fname->base_name);
if (abspath == NULL) {
return -1;
}
convert_sbuf(handle, abspath, &smb_fname->st);
TALLOC_FREE(abspath);
return 0;
}
tmp = smb_fname->base_name;
smb_fname->base_name = shadow_copy2_convert(
talloc_tos(), handle, stripped, timestamp);
TALLOC_FREE(stripped);
if (smb_fname->base_name == NULL) {
smb_fname->base_name = tmp;
return -1;
}
ret = SMB_VFS_NEXT_LSTAT(handle, smb_fname);
if (ret != 0) {
goto out;
}
abspath = make_path_absolute(talloc_tos(),
priv,
smb_fname->base_name);
if (abspath == NULL) {
ret = -1;
goto out;
}
convert_sbuf(handle, abspath, &smb_fname->st);
TALLOC_FREE(abspath);
out:
TALLOC_FREE(smb_fname->base_name);
smb_fname->base_name = tmp;
return ret;
}
static int shadow_copy2_fstat(vfs_handle_struct *handle, files_struct *fsp,
SMB_STRUCT_STAT *sbuf)
{
struct shadow_copy2_private *priv = NULL;
time_t timestamp = 0;
struct smb_filename *orig_smb_fname = NULL;
struct smb_filename vss_smb_fname;
struct smb_filename *orig_base_smb_fname = NULL;
struct smb_filename vss_base_smb_fname;
char *stripped = NULL;
char *abspath = NULL;
bool converted = false;
bool ok;
int ret;
SMB_VFS_HANDLE_GET_DATA(handle, priv, struct shadow_copy2_private,
return -1);
ok = shadow_copy2_strip_snapshot_converted(talloc_tos(),
handle,
fsp->fsp_name,
&timestamp,
&stripped,
&converted);
if (!ok) {
return -1;
}
if (timestamp == 0) {
TALLOC_FREE(stripped);
ret = SMB_VFS_NEXT_FSTAT(handle, fsp, sbuf);
if (ret != 0) {
return ret;
}
if (!converted) {
return 0;
}
abspath = make_path_absolute(talloc_tos(),
priv,
fsp->fsp_name->base_name);
if (abspath == NULL) {
return -1;
}
convert_sbuf(handle, abspath, sbuf);
TALLOC_FREE(abspath);
return 0;
}
vss_smb_fname = *fsp->fsp_name;
vss_smb_fname.base_name = shadow_copy2_convert(talloc_tos(),
handle,
stripped,
timestamp);
TALLOC_FREE(stripped);
if (vss_smb_fname.base_name == NULL) {
return -1;
}
orig_smb_fname = fsp->fsp_name;
fsp->fsp_name = &vss_smb_fname;
if (fsp_is_alternate_stream(fsp)) {
vss_base_smb_fname = *fsp->base_fsp->fsp_name;
vss_base_smb_fname.base_name = vss_smb_fname.base_name;
orig_base_smb_fname = fsp->base_fsp->fsp_name;
fsp->base_fsp->fsp_name = &vss_base_smb_fname;
}
ret = SMB_VFS_NEXT_FSTAT(handle, fsp, sbuf);
if (ret != 0) {
goto out;
}
abspath = make_path_absolute(talloc_tos(),
priv,
fsp->fsp_name->base_name);
if (abspath == NULL) {
ret = -1;
goto out;
}
convert_sbuf(handle, abspath, sbuf);
TALLOC_FREE(abspath);
out:
fsp->fsp_name = orig_smb_fname;
if (fsp_is_alternate_stream(fsp)) {
fsp->base_fsp->fsp_name = orig_base_smb_fname;
}
return ret;
}
static int shadow_copy2_fstatat(
struct vfs_handle_struct *handle,
const struct files_struct *dirfsp,
const struct smb_filename *smb_fname_in,
SMB_STRUCT_STAT *sbuf,
int flags)
{
struct shadow_copy2_private *priv = NULL;
struct smb_filename *smb_fname = NULL;
time_t timestamp = 0;
char *stripped = NULL;
char *abspath = NULL;
bool converted = false;
int ret;
bool ok;
SMB_VFS_HANDLE_GET_DATA(handle, priv, struct shadow_copy2_private,
return -1);
smb_fname = full_path_from_dirfsp_atname(talloc_tos(),
dirfsp,
smb_fname_in);
if (smb_fname == NULL) {
errno = ENOMEM;
return -1;
}
ok = shadow_copy2_strip_snapshot_converted(talloc_tos(),
handle,
smb_fname,
&timestamp,
&stripped,
&converted);
if (!ok) {
return -1;
}
if (timestamp == 0) {
TALLOC_FREE(stripped);
ret = SMB_VFS_NEXT_FSTATAT(
handle, dirfsp, smb_fname_in, sbuf, flags);
if (ret != 0) {
return ret;
}
if (!converted) {
return 0;
}
abspath = make_path_absolute(
talloc_tos(), priv, smb_fname->base_name);
if (abspath == NULL) {
errno = ENOMEM;
return -1;
}
convert_sbuf(handle, abspath, sbuf);
TALLOC_FREE(abspath);
return 0;
}
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;
}
ret = SMB_VFS_NEXT_FSTATAT(handle,
dirfsp,
smb_fname,
sbuf,
flags);
if (ret != 0) {
int saved_errno = errno;
TALLOC_FREE(smb_fname);
errno = saved_errno;
return -1;
}
abspath = make_path_absolute(
talloc_tos(), priv, smb_fname->base_name);
if (abspath == NULL) {
TALLOC_FREE(smb_fname);
errno = ENOMEM;
return -1;
}
convert_sbuf(handle, abspath, sbuf);
TALLOC_FREE(abspath);
TALLOC_FREE(smb_fname);
return 0;
}
static struct smb_filename *shadow_copy2_openat_name(
TALLOC_CTX *mem_ctx,
const struct files_struct *dirfsp,
const struct files_struct *fsp,
const struct smb_filename *smb_fname_in)
{
struct smb_filename *result = NULL;
if (fsp->base_fsp != NULL) {
struct smb_filename *base_fname = fsp->base_fsp->fsp_name;
if (smb_fname_in->base_name[0] == '/') {
/*
* Special-case stream names from streams_depot
*/
result = cp_smb_filename(mem_ctx, smb_fname_in);
} else {
SMB_ASSERT(is_named_stream(smb_fname_in));
result = synthetic_smb_fname(mem_ctx,
base_fname->base_name,
smb_fname_in->stream_name,
&smb_fname_in->st,
smb_fname_in->twrp,
smb_fname_in->flags);
}
} else {
result = full_path_from_dirfsp_atname(
mem_ctx, dirfsp, smb_fname_in);
}
return result;
}
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,
const struct vfs_open_how *_how)
{
struct vfs_open_how how = *_how;
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;
if (how.resolve != 0) {
errno = ENOSYS;
return -1;
}
smb_fname = shadow_copy2_openat_name(
talloc_tos(), dirfsp, fsp, smb_fname_in);
if (smb_fname == NULL) {
errno = ENOMEM;
return -1;
}
ok = shadow_copy2_strip_snapshot_converted(talloc_tos(),
handle,
smb_fname,
&timestamp,
&stripped,
&is_converted);
if (!ok) {
TALLOC_FREE(smb_fname);
return -1;
}
if (timestamp == 0) {
TALLOC_FREE(stripped);
TALLOC_FREE(smb_fname);
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.
*/
how.flags &= ~(O_WRONLY | O_RDWR | O_CREAT);
}
return SMB_VFS_NEXT_OPENAT(handle,
dirfsp,
smb_fname_in,
fsp,
&how);
}
smb_fname->base_name = shadow_copy2_convert(smb_fname,
handle,
stripped,
timestamp);
if (smb_fname->base_name == NULL) {
int err = errno;
TALLOC_FREE(stripped);
TALLOC_FREE(smb_fname);
errno = err;
return -1;
}
TALLOC_FREE(stripped);
/*
* 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.
*/
how.flags &= ~(O_WRONLY | O_RDWR | O_CREAT);
ret = SMB_VFS_NEXT_OPENAT(handle,
dirfsp,
smb_fname,
fsp,
&how);
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,
int flags)
{
time_t timestamp = 0;
if (!shadow_copy2_strip_snapshot(talloc_tos(), handle,
smb_fname,
&timestamp, NULL)) {
return -1;
}
if (timestamp != 0) {
errno = EROFS;
return -1;
}
return SMB_VFS_NEXT_UNLINKAT(handle,
dirfsp,
smb_fname,
flags);
}
static int shadow_copy2_fchmod(vfs_handle_struct *handle,
struct files_struct *fsp,
mode_t mode)
{
time_t timestamp = 0;
const struct smb_filename *smb_fname = NULL;
smb_fname = fsp->fsp_name;
if (!shadow_copy2_strip_snapshot(talloc_tos(),
handle,
smb_fname,
&timestamp,
NULL)) {
return -1;
}
if (timestamp != 0) {
errno = EROFS;
return -1;
}
return SMB_VFS_NEXT_FCHMOD(handle, fsp, mode);
}
static void store_cwd_data(vfs_handle_struct *handle,
const char *connectpath)
{
struct shadow_copy2_private *priv = NULL;
struct smb_filename *cwd_fname = NULL;
SMB_VFS_HANDLE_GET_DATA(handle, priv, struct shadow_copy2_private,
return);
TALLOC_FREE(priv->shadow_cwd);
cwd_fname = SMB_VFS_NEXT_GETWD(handle, talloc_tos());
if (cwd_fname == NULL) {
smb_panic("getwd failed\n");
}
DBG_DEBUG("shadow cwd = %s\n", cwd_fname->base_name);
priv->shadow_cwd = talloc_strdup(priv, cwd_fname->base_name);
TALLOC_FREE(cwd_fname);
if (priv->shadow_cwd == NULL) {
smb_panic("talloc failed\n");
}
TALLOC_FREE(priv->shadow_connectpath);
if (connectpath) {
DBG_DEBUG("shadow connectpath = %s\n", connectpath);
priv->shadow_connectpath = talloc_strdup(priv, connectpath);
if (priv->shadow_connectpath == NULL) {
smb_panic("talloc failed\n");
}
}
}
static int shadow_copy2_chdir(vfs_handle_struct *handle,
const struct smb_filename *smb_fname)
{
time_t timestamp = 0;
char *stripped = NULL;
char *snappath = NULL;
int ret = -1;
int saved_errno = 0;
char *conv = NULL;
size_t rootpath_len = 0;
struct smb_filename *conv_smb_fname = NULL;
if (!shadow_copy2_strip_snapshot_internal(talloc_tos(),
handle,
smb_fname,
&timestamp,
&stripped,
&snappath,
NULL)) {
return -1;
}
if (stripped != NULL) {
conv = shadow_copy2_do_convert(talloc_tos(),
handle,
stripped,
timestamp,
&rootpath_len);
TALLOC_FREE(stripped);
if (conv == NULL) {
return -1;
}
conv_smb_fname = synthetic_smb_fname(talloc_tos(),
conv,
NULL,
NULL,
0,
smb_fname->flags);
} else {
conv_smb_fname = cp_smb_filename(talloc_tos(), smb_fname);
}
if (conv_smb_fname == NULL) {
TALLOC_FREE(conv);
errno = ENOMEM;
return -1;
}
ret = SMB_VFS_NEXT_CHDIR(handle, conv_smb_fname);
if (ret == -1) {
saved_errno = errno;
}
if (ret == 0) {
if (conv != NULL && rootpath_len != 0) {
conv[rootpath_len] = '\0';
} else if (snappath != 0) {
TALLOC_FREE(conv);
conv = snappath;
}
store_cwd_data(handle, conv);
}
TALLOC_FREE(stripped);
TALLOC_FREE(conv);
TALLOC_FREE(conv_smb_fname);
if (saved_errno != 0) {
errno = saved_errno;
}
return ret;
}
static int shadow_copy2_fntimes(vfs_handle_struct *handle,
files_struct *fsp,
struct smb_file_time *ft)
{
time_t timestamp = 0;
if (!shadow_copy2_strip_snapshot(talloc_tos(),
handle,
fsp->fsp_name,
&timestamp,
NULL)) {
return -1;
}
if (timestamp != 0) {
errno = EROFS;
return -1;
}
return SMB_VFS_NEXT_FNTIMES(handle, fsp, ft);
}
static int shadow_copy2_readlinkat(vfs_handle_struct *handle,
const struct files_struct *dirfsp,
const struct smb_filename *smb_fname,
char *buf,
size_t bufsiz)
{
time_t timestamp = 0;
char *stripped = NULL;
int saved_errno = 0;
int ret;
struct smb_filename *full_fname = NULL;
struct smb_filename *conv = NULL;
full_fname = full_path_from_dirfsp_atname(talloc_tos(),
dirfsp,
smb_fname);
if (full_fname == NULL) {
errno = ENOMEM;
return -1;
}
if (!shadow_copy2_strip_snapshot(talloc_tos(),
handle,
full_fname,
&timestamp,
&stripped)) {
TALLOC_FREE(full_fname);
return -1;
}
if (timestamp == 0) {
TALLOC_FREE(full_fname);
TALLOC_FREE(stripped);
return SMB_VFS_NEXT_READLINKAT(handle,
dirfsp,
smb_fname,
buf,
bufsiz);
}
conv = cp_smb_filename(talloc_tos(), full_fname);
if (conv == NULL) {
TALLOC_FREE(full_fname);
TALLOC_FREE(stripped);
errno = ENOMEM;
return -1;
}
TALLOC_FREE(full_fname);
conv->base_name = shadow_copy2_convert(
conv, handle, stripped, timestamp);
TALLOC_FREE(stripped);
if (conv->base_name == NULL) {
return -1;
}
ret = SMB_VFS_NEXT_READLINKAT(handle,
handle->conn->cwd_fsp,
conv,
buf,
bufsiz);
if (ret == -1) {
saved_errno = errno;
}
TALLOC_FREE(conv);
if (saved_errno != 0) {
errno = saved_errno;
}
return ret;
}
static int shadow_copy2_mknodat(vfs_handle_struct *handle,
files_struct *dirfsp,
const struct smb_filename *smb_fname,
mode_t mode,
SMB_DEV_T dev)
{
time_t timestamp = 0;
if (!shadow_copy2_strip_snapshot(talloc_tos(), handle,
smb_fname,
&timestamp, NULL)) {
return -1;
}
if (timestamp != 0) {
errno = EROFS;
return -1;
}
return SMB_VFS_NEXT_MKNODAT(handle,
dirfsp,
smb_fname,
mode,
dev);
}
static struct smb_filename *shadow_copy2_realpath(vfs_handle_struct *handle,
TALLOC_CTX *ctx,
const struct smb_filename *smb_fname)
{
time_t timestamp = 0;
char *stripped = NULL;
struct smb_filename *result_fname = NULL;
struct smb_filename *conv_fname = NULL;
int saved_errno = 0;
if (!shadow_copy2_strip_snapshot(talloc_tos(), handle,
smb_fname,
&timestamp, &stripped)) {
goto done;
}
if (timestamp == 0) {
return SMB_VFS_NEXT_REALPATH(handle, ctx, smb_fname);
}
conv_fname = cp_smb_filename(talloc_tos(), smb_fname);
if (conv_fname == NULL) {
goto done;
}
conv_fname->base_name = shadow_copy2_convert(
conv_fname, handle, stripped, timestamp);
if (conv_fname->base_name == NULL) {
goto done;
}
result_fname = SMB_VFS_NEXT_REALPATH(handle, ctx, conv_fname);
done:
if (result_fname == NULL) {
saved_errno = errno;
}
TALLOC_FREE(conv_fname);
TALLOC_FREE(stripped);
if (saved_errno != 0) {
errno = saved_errno;
}
return result_fname;
}
/**
* Check whether a given directory contains a
* snapshot directory as direct subdirectory.
* If yes, return the path of the snapshot-subdir,
* otherwise return NULL.
*/
static char *have_snapdir(struct vfs_handle_struct *handle,
TALLOC_CTX *mem_ctx,
const char *path)
{
struct smb_filename smb_fname;
int ret;
struct shadow_copy2_private *priv;
SMB_VFS_HANDLE_GET_DATA(handle, priv, struct shadow_copy2_private,
return NULL);
smb_fname = (struct smb_filename) {
.base_name = talloc_asprintf(
mem_ctx, "%s/%s", path, priv->config->snapdir),
};
if (smb_fname.base_name == NULL) {
return NULL;
}
ret = SMB_VFS_NEXT_STAT(handle, &smb_fname);
if ((ret == 0) && (S_ISDIR(smb_fname.st.st_ex_mode))) {
return smb_fname.base_name;
}
TALLOC_FREE(smb_fname.base_name);
return NULL;
}
/**
* Find the snapshot directory (if any) for the given
* filename (which is relative to the share).
*/
static const char *shadow_copy2_find_snapdir(TALLOC_CTX *mem_ctx,
struct vfs_handle_struct *handle,
struct smb_filename *smb_fname)
{
char *path, *p;
const char *snapdir;
struct shadow_copy2_config *config;
struct shadow_copy2_private *priv;
SMB_VFS_HANDLE_GET_DATA(handle, priv, struct shadow_copy2_private,
return NULL);
config = priv->config;
/*
* If the non-snapdisrseverywhere mode, we should not search!
*/
if (!config->snapdirseverywhere) {
return config->snapshot_basepath;
}
path = talloc_asprintf(mem_ctx, "%s/%s",
handle->conn->connectpath,
smb_fname->base_name);
if (path == NULL) {
return NULL;
}
snapdir = have_snapdir(handle, talloc_tos(), path);
if (snapdir != NULL) {
TALLOC_FREE(path);
return snapdir;
}
while ((p = strrchr(path, '/')) && (p > path)) {
p[0] = '\0';
snapdir = have_snapdir(handle, talloc_tos(), path);
if (snapdir != NULL) {
TALLOC_FREE(path);
return snapdir;
}
}
TALLOC_FREE(path);
return NULL;
}
static bool shadow_copy2_snapshot_to_gmt(vfs_handle_struct *handle,
const char *name,
char *gmt, size_t gmt_len)
{
struct tm timestamp = { .tm_sec = 0, };
time_t timestamp_t;
unsigned long int timestamp_long;
const char *fmt;
struct shadow_copy2_config *config;
struct shadow_copy2_private *priv;
char *tmpstr = NULL;
char *tmp = NULL;
bool converted = false;
int ret = -1;
SMB_VFS_HANDLE_GET_DATA(handle, priv, struct shadow_copy2_private,
return NULL);
config = priv->config;
fmt = config->gmt_format;
/*
* If regex is provided, then we will have to parse the
* filename which will contain both the prefix and the time format.
* e.g. <prefix><delimiter><time_format>
*/
if (priv->snaps->regex != NULL) {
tmpstr = talloc_strdup(talloc_tos(), name);
/* point "name" to the time format */
name = strstr(name, priv->config->delimiter);
if (name == NULL) {
goto done;
}
/* Extract the prefix */
tmp = strstr(tmpstr, priv->config->delimiter);
if (tmp == NULL) {
goto done;
}
*tmp = '\0';
/* Parse regex */
ret = regexec(priv->snaps->regex, tmpstr, 0, NULL, 0);
if (ret) {
DBG_DEBUG("shadow_copy2_snapshot_to_gmt: "
"no regex match for %s\n", tmpstr);
goto done;
}
}
if (config->use_sscanf) {
if (sscanf(name, fmt, &timestamp_long) != 1) {
DEBUG(10, ("shadow_copy2_snapshot_to_gmt: "
"no sscanf match %s: %s\n",
fmt, name));
goto done;
}
timestamp_t = timestamp_long;
gmtime_r(&timestamp_t, &timestamp);
} else {
if (strptime(name, fmt, &timestamp) == NULL) {
DEBUG(10, ("shadow_copy2_snapshot_to_gmt: "
"no match %s: %s\n",
fmt, name));
goto done;
}
DEBUG(10, ("shadow_copy2_snapshot_to_gmt: match %s: %s\n",
fmt, name));
if (config->use_localtime) {
timestamp.tm_isdst = -1;
timestamp_t = mktime(&timestamp);
gmtime_r(&timestamp_t, &timestamp);
}
}
strftime(gmt, gmt_len, GMT_FORMAT, &timestamp);
converted = true;
done:
TALLOC_FREE(tmpstr);
return converted;
}
static int shadow_copy2_label_cmp_asc(const void *x, const void *y)
{
return strncmp((const char *)x, (const char *)y, sizeof(SHADOW_COPY_LABEL));
}
static int shadow_copy2_label_cmp_desc(const void *x, const void *y)
{
return -strncmp((const char *)x, (const char *)y, sizeof(SHADOW_COPY_LABEL));
}
/*
sort the shadow copy data in ascending or descending order
*/
static void shadow_copy2_sort_data(vfs_handle_struct *handle,
struct shadow_copy_data *shadow_copy2_data)
{
int (*cmpfunc)(const void *, const void *);
const char *sort;
struct shadow_copy2_private *priv;
SMB_VFS_HANDLE_GET_DATA(handle, priv, struct shadow_copy2_private,
return);
sort = priv->config->sort_order;
if (sort == NULL) {
return;
}
if (strcmp(sort, "asc") == 0) {
cmpfunc = shadow_copy2_label_cmp_asc;
} else if (strcmp(sort, "desc") == 0) {
cmpfunc = shadow_copy2_label_cmp_desc;
} else {
return;
}
if (shadow_copy2_data && shadow_copy2_data->num_volumes > 0 &&
shadow_copy2_data->labels)
{
TYPESAFE_QSORT(shadow_copy2_data->labels,
shadow_copy2_data->num_volumes,
cmpfunc);
}
}
static int shadow_copy2_get_shadow_copy_data(
vfs_handle_struct *handle, files_struct *fsp,
struct shadow_copy_data *shadow_copy2_data,
bool labels)
{
DIR *p = NULL;
const char *snapdir;
struct smb_filename *snapdir_smb_fname = NULL;
struct files_struct *dirfsp = NULL;
struct files_struct *fspcwd = NULL;
struct dirent *d;
TALLOC_CTX *tmp_ctx = talloc_stackframe();
struct shadow_copy2_private *priv = NULL;
struct shadow_copy2_snapentry *tmpentry = NULL;
bool get_snaplist = false;
struct vfs_open_how how = {
.flags = O_RDONLY, .mode = 0,
};
int fd;
int ret = -1;
NTSTATUS status;
int saved_errno = 0;
snapdir = shadow_copy2_find_snapdir(tmp_ctx, handle, fsp->fsp_name);
if (snapdir == NULL) {
DEBUG(0,("shadow:snapdir not found for %s in get_shadow_copy_data\n",
handle->conn->connectpath));
errno = EINVAL;
goto done;
}
snapdir_smb_fname = synthetic_smb_fname(talloc_tos(),
snapdir,
NULL,
NULL,
0,
fsp->fsp_name->flags);
if (snapdir_smb_fname == NULL) {
errno = ENOMEM;
goto done;
}
status = create_internal_dirfsp(handle->conn,
snapdir_smb_fname,
&dirfsp);
if (!NT_STATUS_IS_OK(status)) {
DBG_WARNING("create_internal_dir_fsp() failed for '%s'"
" - %s\n", snapdir, nt_errstr(status));
errno = ENOSYS;
goto done;
}
status = vfs_at_fspcwd(talloc_tos(), handle->conn, &fspcwd);
if (!NT_STATUS_IS_OK(status)) {
errno = ENOMEM;
goto done;
}
#ifdef O_DIRECTORY
how.flags |= O_DIRECTORY;
#endif
fd = SMB_VFS_NEXT_OPENAT(handle,
fspcwd,
snapdir_smb_fname,
dirfsp,
&how);
if (fd == -1) {
DBG_WARNING("SMB_VFS_NEXT_OPEN failed for '%s'"
" - %s\n", snapdir, strerror(errno));
errno = ENOSYS;
goto done;
}
fsp_set_fd(dirfsp, fd);
/* Now we have the handle, check access here. */
status = smbd_check_access_rights_fsp(fspcwd,
dirfsp,
false,
SEC_DIR_LIST);
if (!NT_STATUS_IS_OK(status)) {
DBG_ERR("user does not have list permission "
"on snapdir %s\n",
fsp_str_dbg(dirfsp));
errno = EACCES;
goto done;
}
p = SMB_VFS_NEXT_FDOPENDIR(handle, dirfsp, NULL, 0);
if (!p) {
DBG_NOTICE("shadow_copy2: SMB_VFS_NEXT_FDOPENDIR() failed for '%s'"
" - %s\n", snapdir, strerror(errno));
errno = ENOSYS;
goto done;
}
if (shadow_copy2_data != NULL) {
shadow_copy2_data->num_volumes = 0;
shadow_copy2_data->labels = NULL;
}
SMB_VFS_HANDLE_GET_DATA(handle, priv, struct shadow_copy2_private,
goto done);
/*
* Normally this function is called twice once with labels = false and
* then with labels = true. When labels is false it will return the
* number of volumes so that the caller can allocate memory for that
* many labels. Therefore to eliminate snaplist both the times it is
* good to check if labels is set or not.
*
* shadow_copy2_data is NULL when we only want to update the list and
* don't want any labels.
*/
if ((priv->snaps->regex != NULL) && (labels || shadow_copy2_data == NULL)) {
get_snaplist = true;
/* Reset the global snaplist */
shadow_copy2_delete_snaplist(priv);
/* Set the current time as snaplist update time */
time(&(priv->snaps->fetch_time));
}
while ((d = SMB_VFS_NEXT_READDIR(handle, dirfsp, p))) {
char snapshot[GMT_NAME_LEN+1];
SHADOW_COPY_LABEL *tlabels;
/*
* ignore names not of the right form in the snapshot
* directory
*/
if (!shadow_copy2_snapshot_to_gmt(
handle, d->d_name,
snapshot, sizeof(snapshot))) {
DEBUG(6, ("shadow_copy2_get_shadow_copy_data: "
"ignoring %s\n", d->d_name));
continue;
}
DEBUG(6,("shadow_copy2_get_shadow_copy_data: %s -> %s\n",
d->d_name, snapshot));
if (get_snaplist) {
/*
* Create a snap entry for each successful
* pattern match.
*/
tmpentry = shadow_copy2_create_snapentry(priv);
if (tmpentry == NULL) {
DBG_ERR("talloc_zero() failed\n");
goto done;
}
tmpentry->snapname = talloc_strdup(tmpentry, d->d_name);
tmpentry->time_fmt = talloc_strdup(tmpentry, snapshot);
}
if (shadow_copy2_data == NULL) {
continue;
}
if (!labels) {
/* the caller doesn't want the labels */
shadow_copy2_data->num_volumes++;
continue;
}
tlabels = talloc_realloc(shadow_copy2_data,
shadow_copy2_data->labels,
SHADOW_COPY_LABEL,
shadow_copy2_data->num_volumes+1);
if (tlabels == NULL) {
DEBUG(0,("shadow_copy2: out of memory\n"));
goto done;
}
strlcpy(tlabels[shadow_copy2_data->num_volumes], snapshot,
sizeof(*tlabels));
shadow_copy2_data->num_volumes++;
shadow_copy2_data->labels = tlabels;
}
shadow_copy2_sort_data(handle, shadow_copy2_data);
ret = 0;
done:
if (ret != 0) {
saved_errno = errno;
}
TALLOC_FREE(fspcwd );
if (p != NULL) {
SMB_VFS_NEXT_CLOSEDIR(handle, p);
p = NULL;
if (dirfsp != NULL) {
/*
* VFS_CLOSEDIR implicitly
* closed the associated fd.
*/
fsp_set_fd(dirfsp, -1);
}
}
if (dirfsp != NULL) {
fd_close(dirfsp);
file_free(NULL, dirfsp);
}
TALLOC_FREE(tmp_ctx);
if (saved_errno != 0) {
errno = saved_errno;
}
return ret;
}
static int shadow_copy2_mkdirat(vfs_handle_struct *handle,
struct files_struct *dirfsp,
const struct smb_filename *smb_fname,
mode_t mode)
{
struct smb_filename *full_fname = NULL;
time_t timestamp = 0;
full_fname = full_path_from_dirfsp_atname(talloc_tos(),
dirfsp,
smb_fname);
if (full_fname == NULL) {
errno = ENOMEM;
return -1;
}
if (!shadow_copy2_strip_snapshot(talloc_tos(),
handle,
full_fname,
&timestamp,
NULL)) {
TALLOC_FREE(full_fname);
return -1;
}
TALLOC_FREE(full_fname);
if (timestamp != 0) {
errno = EROFS;
return -1;
}
return SMB_VFS_NEXT_MKDIRAT(handle,
dirfsp,
smb_fname,
mode);
}
static int shadow_copy2_fchflags(vfs_handle_struct *handle,
struct files_struct *fsp,
unsigned int flags)
{
time_t timestamp = 0;
if (!shadow_copy2_strip_snapshot(talloc_tos(),
handle,
fsp->fsp_name,
&timestamp,
NULL)) {
return -1;
}
if (timestamp != 0) {
errno = EROFS;
return -1;
}
return SMB_VFS_NEXT_FCHFLAGS(handle, fsp, flags);
}
static int shadow_copy2_fsetxattr(struct vfs_handle_struct *handle,
struct files_struct *fsp,
const char *aname, const void *value,
size_t size, int flags)
{
time_t timestamp = 0;
const struct smb_filename *smb_fname = NULL;
smb_fname = fsp->fsp_name;
if (!shadow_copy2_strip_snapshot(talloc_tos(),
handle,
smb_fname,
&timestamp,
NULL)) {
return -1;
}
if (timestamp != 0) {
errno = EROFS;
return -1;
}
return SMB_VFS_NEXT_FSETXATTR(handle, fsp,
aname, value, size, flags);
}
static NTSTATUS shadow_copy2_create_dfs_pathat(struct vfs_handle_struct *handle,
struct files_struct *dirfsp,
const struct smb_filename *smb_fname,
const struct referral *reflist,
size_t referral_count)
{
time_t timestamp = 0;
if (!shadow_copy2_strip_snapshot(talloc_tos(),
handle,
smb_fname,
&timestamp,
NULL)) {
return NT_STATUS_NO_MEMORY;
}
if (timestamp != 0) {
return NT_STATUS_MEDIA_WRITE_PROTECTED;
}
return SMB_VFS_NEXT_CREATE_DFS_PATHAT(handle,
dirfsp,
smb_fname,
reflist,
referral_count);
}
static NTSTATUS shadow_copy2_read_dfs_pathat(struct vfs_handle_struct *handle,
TALLOC_CTX *mem_ctx,
struct files_struct *dirfsp,
struct smb_filename *smb_fname,
struct referral **ppreflist,
size_t *preferral_count)
{
time_t timestamp = 0;
char *stripped = NULL;
struct smb_filename *full_fname = NULL;
struct smb_filename *conv = NULL;
NTSTATUS status;
full_fname = full_path_from_dirfsp_atname(talloc_tos(),
dirfsp,
smb_fname);
if (full_fname == NULL) {
return NT_STATUS_NO_MEMORY;
}
if (!shadow_copy2_strip_snapshot(mem_ctx,
handle,
full_fname,
&timestamp,
&stripped)) {
TALLOC_FREE(full_fname);
return NT_STATUS_NO_MEMORY;
}
if (timestamp == 0) {
TALLOC_FREE(full_fname);
TALLOC_FREE(stripped);
return SMB_VFS_NEXT_READ_DFS_PATHAT(handle,
mem_ctx,
dirfsp,
smb_fname,
ppreflist,
preferral_count);
}
conv = cp_smb_filename(mem_ctx, full_fname);
if (conv == NULL) {
TALLOC_FREE(full_fname);
TALLOC_FREE(stripped);
return NT_STATUS_NO_MEMORY;
}
TALLOC_FREE(full_fname);
conv->base_name = shadow_copy2_convert(conv,
handle,
stripped,
timestamp);
TALLOC_FREE(stripped);
if (conv->base_name == NULL) {
TALLOC_FREE(conv);
return NT_STATUS_NO_MEMORY;
}
status = SMB_VFS_NEXT_READ_DFS_PATHAT(handle,
mem_ctx,
handle->conn->cwd_fsp,
conv,
ppreflist,
preferral_count);
if (NT_STATUS_IS_OK(status)) {
/* Return any stat(2) info. */
smb_fname->st = conv->st;
}
TALLOC_FREE(conv);
return status;
}
static NTSTATUS shadow_copy2_get_real_filename_at(
struct vfs_handle_struct *handle,
struct files_struct *dirfsp,
const char *name,
TALLOC_CTX *mem_ctx,
char **found_name)
{
struct shadow_copy2_private *priv = NULL;
time_t timestamp = 0;
char *stripped = NULL;
char *conv;
struct smb_filename *conv_fname = NULL;
NTSTATUS status;
bool ok;
SMB_VFS_HANDLE_GET_DATA(handle, priv, struct shadow_copy2_private,
return NT_STATUS_INTERNAL_ERROR);
DBG_DEBUG("Path=[%s] name=[%s]\n", fsp_str_dbg(dirfsp), name);
ok = shadow_copy2_strip_snapshot(
talloc_tos(), handle, dirfsp->fsp_name, &timestamp, &stripped);
if (!ok) {
status = map_nt_error_from_unix(errno);
DEBUG(10, ("shadow_copy2_strip_snapshot failed\n"));
return status;
}
if (timestamp == 0) {
DEBUG(10, ("timestamp == 0\n"));
return SMB_VFS_NEXT_GET_REAL_FILENAME_AT(
handle, dirfsp, name, mem_ctx, found_name);
}
/*
* Note that stripped may be an empty string "" if path was ".". As
* shadow_copy2_convert() combines "" with the shadow-copy tree connect
* root fullpath and get_real_filename_full_scan() has an explicit check
* for "" this works.
*/
DBG_DEBUG("stripped [%s]\n", stripped);
conv = shadow_copy2_convert(talloc_tos(), handle, stripped, timestamp);
if (conv == NULL) {
status = map_nt_error_from_unix(errno);
DBG_DEBUG("shadow_copy2_convert [%s] failed: %s\n",
stripped,
strerror(errno));
return status;
}
status = synthetic_pathref(
talloc_tos(),
dirfsp->conn->cwd_fsp,
conv,
NULL,
NULL,
0,
0,
&conv_fname);
if (!NT_STATUS_IS_OK(status)) {
return status;
}
DEBUG(10, ("Calling NEXT_GET_REAL_FILE_NAME for conv=[%s], "
"name=[%s]\n", conv, name));
status = SMB_VFS_NEXT_GET_REAL_FILENAME_AT(
handle, conv_fname->fsp, name, mem_ctx, found_name);
DEBUG(10, ("NEXT_REAL_FILE_NAME returned %s\n", nt_errstr(status)));
if (NT_STATUS_IS_OK(status)) {
TALLOC_FREE(conv_fname);
return NT_STATUS_OK;
}
if (!NT_STATUS_EQUAL(status, NT_STATUS_NOT_SUPPORTED)) {
TALLOC_FREE(conv_fname);
TALLOC_FREE(conv);
return NT_STATUS_NOT_SUPPORTED;
}
status = get_real_filename_full_scan_at(
conv_fname->fsp, name, false, mem_ctx, found_name);
TALLOC_FREE(conv_fname);
if (!NT_STATUS_IS_OK(status)) {
DBG_DEBUG("Scan [%s] for [%s] failed\n",
conv, name);
return status;
}
DBG_DEBUG("Scan [%s] for [%s] returned [%s]\n",
conv, name, *found_name);
TALLOC_FREE(conv);
return NT_STATUS_OK;
}
static const char *shadow_copy2_connectpath(
struct vfs_handle_struct *handle,
const struct files_struct *dirfsp,
const struct smb_filename *smb_fname_in)
{
time_t timestamp = 0;
char *stripped = NULL;
char *tmp = NULL;
const char *fname = smb_fname_in->base_name;
const struct smb_filename *full = NULL;
struct smb_filename smb_fname = {0};
struct smb_filename *result_fname = NULL;
char *result = NULL;
char *parent_dir = NULL;
int saved_errno = 0;
size_t rootpath_len = 0;
struct shadow_copy2_private *priv = NULL;
SMB_VFS_HANDLE_GET_DATA(handle, priv, struct shadow_copy2_private,
return NULL);
DBG_DEBUG("Calc connect path for [%s]\n", fname);
if (priv->shadow_connectpath != NULL) {
DBG_DEBUG("cached connect path is [%s]\n",
priv->shadow_connectpath);
return priv->shadow_connectpath;
}
full = full_path_from_dirfsp_atname(
talloc_tos(), dirfsp, smb_fname_in);
if (full == NULL) {
return NULL;
}
if (!shadow_copy2_strip_snapshot(talloc_tos(), handle, full,
&timestamp, &stripped)) {
goto done;
}
if (timestamp == 0) {
return SMB_VFS_NEXT_CONNECTPATH(handle, dirfsp, smb_fname_in);
}
tmp = shadow_copy2_do_convert(talloc_tos(), handle, stripped, timestamp,
&rootpath_len);
if (tmp == NULL) {
if (errno != ENOENT) {
goto done;
}
/*
* If the converted path does not exist, and converting
* the parent yields something that does exist, then
* this path refers to something that has not been
* created yet, relative to the parent path.
* The snapshot finding is relative to the parent.
* (usually snapshots are read/only but this is not
* necessarily true).
* This code also covers getting a wildcard in the
* last component, because this function is called
* prior to sanitizing the path, and in SMB1 we may
* get wildcards in path names.
*/
if (!parent_dirname(talloc_tos(), stripped, &parent_dir,
NULL)) {
errno = ENOMEM;
goto done;
}
tmp = shadow_copy2_do_convert(talloc_tos(), handle, parent_dir,
timestamp, &rootpath_len);
if (tmp == NULL) {
goto done;
}
}
DBG_DEBUG("converted path is [%s] root path is [%.*s]\n", tmp,
(int)rootpath_len, tmp);
tmp[rootpath_len] = '\0';
smb_fname = (struct smb_filename) { .base_name = tmp };
result_fname = SMB_VFS_NEXT_REALPATH(handle, priv, &smb_fname);
if (result_fname == NULL) {
goto done;
}
/*
* SMB_VFS_NEXT_REALPATH returns a talloc'ed string.
* Don't leak memory.
*/
TALLOC_FREE(priv->shadow_realpath);
priv->shadow_realpath = result_fname;
result = priv->shadow_realpath->base_name;
DBG_DEBUG("connect path is [%s]\n", result);
done:
if (result == NULL) {
saved_errno = errno;
}
TALLOC_FREE(tmp);
TALLOC_FREE(stripped);
TALLOC_FREE(parent_dir);
if (saved_errno != 0) {
errno = saved_errno;
}
return result;
}
static NTSTATUS shadow_copy2_parent_pathname(vfs_handle_struct *handle,
TALLOC_CTX *ctx,
const struct smb_filename *smb_fname_in,
struct smb_filename **parent_dir_out,
struct smb_filename **atname_out)
{
time_t timestamp = 0;
char *stripped = NULL;
char *converted_name = NULL;
struct smb_filename *smb_fname = NULL;
struct smb_filename *parent = NULL;
struct smb_filename *atname = NULL;
struct shadow_copy2_private *priv = NULL;
bool ok = false;
bool is_converted = false;
NTSTATUS status = NT_STATUS_OK;
TALLOC_CTX *frame = NULL;
SMB_VFS_HANDLE_GET_DATA(handle,
priv,
struct shadow_copy2_private,
return NT_STATUS_INTERNAL_ERROR);
frame = talloc_stackframe();
smb_fname = cp_smb_filename(frame, smb_fname_in);
if (smb_fname == NULL) {
status = NT_STATUS_NO_MEMORY;
goto fail;
}
/* First, call the default PARENT_PATHNAME. */
status = SMB_VFS_NEXT_PARENT_PATHNAME(handle,
frame,
smb_fname,
&parent,
&atname);
if (!NT_STATUS_IS_OK(status)) {
goto fail;
}
if (parent->twrp == 0) {
/*
* Parent is not a snapshot path, return
* the regular result.
*/
status = NT_STATUS_OK;
goto out;
}
/* See if we can find a snapshot for the parent. */
ok = shadow_copy2_strip_snapshot_converted(frame,
handle,
parent,
&timestamp,
&stripped,
&is_converted);
if (!ok) {
status = map_nt_error_from_unix(errno);
goto fail;
}
if (is_converted) {
/*
* Already found snapshot for parent so wipe
* out the twrp.
*/
parent->twrp = 0;
goto out;
}
converted_name = shadow_copy2_convert(frame,
handle,
stripped,
timestamp);
if (converted_name == NULL) {
/*
* Can't find snapshot for parent so wipe
* out the twrp.
*/
parent->twrp = 0;
}
out:
*parent_dir_out = talloc_move(ctx, &parent);
if (atname_out != NULL) {
*atname_out = talloc_move(*parent_dir_out, &atname);
}
fail:
TALLOC_FREE(frame);
return status;
}
static uint64_t shadow_copy2_disk_free(vfs_handle_struct *handle,
const struct smb_filename *smb_fname,
uint64_t *bsize,
uint64_t *dfree,
uint64_t *dsize)
{
time_t timestamp = 0;
char *stripped = NULL;
int saved_errno = 0;
char *conv = NULL;
struct smb_filename *conv_smb_fname = NULL;
uint64_t ret = (uint64_t)-1;
if (!shadow_copy2_strip_snapshot(talloc_tos(),
handle,
smb_fname,
&timestamp,
&stripped)) {
return (uint64_t)-1;
}
if (timestamp == 0) {
return SMB_VFS_NEXT_DISK_FREE(handle, smb_fname,
bsize, dfree, dsize);
}
conv = shadow_copy2_convert(talloc_tos(), handle, stripped, timestamp);
TALLOC_FREE(stripped);
if (conv == NULL) {
return (uint64_t)-1;
}
conv_smb_fname = synthetic_smb_fname(talloc_tos(),
conv,
NULL,
NULL,
0,
smb_fname->flags);
if (conv_smb_fname == NULL) {
TALLOC_FREE(conv);
return (uint64_t)-1;
}
ret = SMB_VFS_NEXT_DISK_FREE(handle, conv_smb_fname,
bsize, dfree, dsize);
if (ret == (uint64_t)-1) {
saved_errno = errno;
}
TALLOC_FREE(conv);
TALLOC_FREE(conv_smb_fname);
if (saved_errno != 0) {
errno = saved_errno;
}
return ret;
}
static int shadow_copy2_get_quota(vfs_handle_struct *handle,
const struct smb_filename *smb_fname,
enum SMB_QUOTA_TYPE qtype,
unid_t id,
SMB_DISK_QUOTA *dq)
{
time_t timestamp = 0;
char *stripped = NULL;
int ret;
int saved_errno = 0;
char *conv;
struct smb_filename *conv_smb_fname = NULL;
if (!shadow_copy2_strip_snapshot(talloc_tos(),
handle,
smb_fname,
&timestamp,
&stripped)) {
return -1;
}
if (timestamp == 0) {
return SMB_VFS_NEXT_GET_QUOTA(handle, smb_fname, qtype, id, dq);
}
conv = shadow_copy2_convert(talloc_tos(), handle, stripped, timestamp);
TALLOC_FREE(stripped);
if (conv == NULL) {
return -1;
}
conv_smb_fname = synthetic_smb_fname(talloc_tos(),
conv,
NULL,
NULL,
0,
smb_fname->flags);
if (conv_smb_fname == NULL) {
TALLOC_FREE(conv);
return -1;
}
ret = SMB_VFS_NEXT_GET_QUOTA(handle, conv_smb_fname, qtype, id, dq);
if (ret == -1) {
saved_errno = errno;
}
TALLOC_FREE(conv);
TALLOC_FREE(conv_smb_fname);
if (saved_errno != 0) {
errno = saved_errno;
}
return ret;
}
static ssize_t shadow_copy2_pwrite(vfs_handle_struct *handle,
files_struct *fsp,
const void *data,
size_t n,
off_t offset)
{
ssize_t nwritten;
nwritten = SMB_VFS_NEXT_PWRITE(handle, fsp, data, n, offset);
if (nwritten == -1) {
if (errno == EBADF && fsp->fsp_flags.can_write) {
errno = EROFS;
}
}
return nwritten;
}
struct shadow_copy2_pwrite_state {
vfs_handle_struct *handle;
files_struct *fsp;
ssize_t ret;
struct vfs_aio_state vfs_aio_state;
};
static void shadow_copy2_pwrite_done(struct tevent_req *subreq);
static struct tevent_req *shadow_copy2_pwrite_send(
struct vfs_handle_struct *handle, TALLOC_CTX *mem_ctx,
struct tevent_context *ev, struct files_struct *fsp,
const void *data, size_t n, off_t offset)
{
struct tevent_req *req = NULL, *subreq = NULL;
struct shadow_copy2_pwrite_state *state = NULL;
req = tevent_req_create(mem_ctx, &state,
struct shadow_copy2_pwrite_state);
if (req == NULL) {
return NULL;
}
state->handle = handle;
state->fsp = fsp;
subreq = SMB_VFS_NEXT_PWRITE_SEND(state,
ev,
handle,
fsp,
data,
n,
offset);
if (tevent_req_nomem(subreq, req)) {
return tevent_req_post(req, ev);
}
tevent_req_set_callback(subreq, shadow_copy2_pwrite_done, req);
return req;
}
static void shadow_copy2_pwrite_done(struct tevent_req *subreq)
{
struct tevent_req *req = tevent_req_callback_data(
subreq, struct tevent_req);
struct shadow_copy2_pwrite_state *state = tevent_req_data(
req, struct shadow_copy2_pwrite_state);
state->ret = SMB_VFS_PWRITE_RECV(subreq, &state->vfs_aio_state);
TALLOC_FREE(subreq);
if (state->ret == -1) {
tevent_req_error(req, state->vfs_aio_state.error);
return;
}
tevent_req_done(req);
}
static ssize_t shadow_copy2_pwrite_recv(struct tevent_req *req,
struct vfs_aio_state *vfs_aio_state)
{
struct shadow_copy2_pwrite_state *state = tevent_req_data(
req, struct shadow_copy2_pwrite_state);
if (tevent_req_is_unix_error(req, &vfs_aio_state->error)) {
if ((vfs_aio_state->error == EBADF) &&
state->fsp->fsp_flags.can_write)
{
vfs_aio_state->error = EROFS;
errno = EROFS;
}
return -1;
}
*vfs_aio_state = state->vfs_aio_state;
return state->ret;
}
static int shadow_copy2_connect(struct vfs_handle_struct *handle,
const char *service, const char *user)
{
struct shadow_copy2_config *config;
struct shadow_copy2_private *priv;
int ret;
const char *snapdir;
const char *snapprefix = NULL;
const char *delimiter;
const char *gmt_format;
const char *sort_order;
const char *basedir = NULL;
const char *snapsharepath = NULL;
const char *mount_point;
DBG_DEBUG("cnum[%" PRIu32 "], connectpath[%s]\n",
handle->conn->cnum,
handle->conn->connectpath);
ret = SMB_VFS_NEXT_CONNECT(handle, service, user);
if (ret < 0) {
return ret;
}
priv = talloc_zero(handle->conn, struct shadow_copy2_private);
if (priv == NULL) {
DBG_ERR("talloc_zero() failed\n");
errno = ENOMEM;
return -1;
}
priv->snaps = talloc_zero(priv, struct shadow_copy2_snaplist_info);
if (priv->snaps == NULL) {
DBG_ERR("talloc_zero() failed\n");
errno = ENOMEM;
return -1;
}
config = talloc_zero(priv, struct shadow_copy2_config);
if (config == NULL) {
DEBUG(0, ("talloc_zero() failed\n"));
errno = ENOMEM;
return -1;
}
priv->config = config;
gmt_format = lp_parm_const_string(SNUM(handle->conn),
"shadow", "format",
GMT_FORMAT);
config->gmt_format = talloc_strdup(config, gmt_format);
if (config->gmt_format == NULL) {
DEBUG(0, ("talloc_strdup() failed\n"));
errno = ENOMEM;
return -1;
}
/* config->gmt_format must not contain a path separator. */
if (strchr(config->gmt_format, '/') != NULL) {
DEBUG(0, ("shadow:format %s must not contain a /"
"character. Unable to initialize module.\n",
config->gmt_format));
errno = EINVAL;
return -1;
}
config->use_sscanf = lp_parm_bool(SNUM(handle->conn),
"shadow", "sscanf", false);
config->use_localtime = lp_parm_bool(SNUM(handle->conn),
"shadow", "localtime",
false);
snapdir = lp_parm_const_string(SNUM(handle->conn),
"shadow", "snapdir",
".snapshots");
config->snapdir = talloc_strdup(config, snapdir);
if (config->snapdir == NULL) {
DEBUG(0, ("talloc_strdup() failed\n"));
errno = ENOMEM;
return -1;
}
snapprefix = lp_parm_const_string(SNUM(handle->conn),
"shadow", "snapprefix",
NULL);
if (snapprefix != NULL) {
priv->snaps->regex = talloc_zero(priv->snaps, regex_t);
if (priv->snaps->regex == NULL) {
DBG_ERR("talloc_zero() failed\n");
errno = ENOMEM;
return -1;
}
/* pre-compute regex rule for matching pattern later */
ret = regcomp(priv->snaps->regex, snapprefix, 0);
if (ret) {
DBG_ERR("Failed to create regex object\n");
return -1;
}
}
delimiter = lp_parm_const_string(SNUM(handle->conn),
"shadow", "delimiter",
"_GMT");
if (delimiter != NULL) {
priv->config->delimiter = talloc_strdup(priv->config, delimiter);
if (priv->config->delimiter == NULL) {
DBG_ERR("talloc_strdup() failed\n");
errno = ENOMEM;
return -1;
}
}
config->snapdirseverywhere = lp_parm_bool(SNUM(handle->conn),
"shadow",
"snapdirseverywhere",
false);
config->crossmountpoints = lp_parm_bool(SNUM(handle->conn),
"shadow", "crossmountpoints",
false);
if (config->crossmountpoints && !config->snapdirseverywhere) {
DBG_WARNING("Warning: 'crossmountpoints' depends on "
"'snapdirseverywhere'. Disabling crossmountpoints.\n");
}
config->fixinodes = lp_parm_bool(SNUM(handle->conn),
"shadow", "fixinodes",
false);
sort_order = lp_parm_const_string(SNUM(handle->conn),
"shadow", "sort", "desc");
config->sort_order = talloc_strdup(config, sort_order);
if (config->sort_order == NULL) {
DEBUG(0, ("talloc_strdup() failed\n"));
errno = ENOMEM;
return -1;
}
mount_point = lp_parm_const_string(SNUM(handle->conn),
"shadow", "mountpoint", NULL);
if (mount_point != NULL) {
if (mount_point[0] != '/') {
DBG_WARNING("Warning: 'mountpoint' is relative "
"('%s'), but it has to be an absolute "
"path. Ignoring provided value.\n",
mount_point);
mount_point = NULL;
} else {
char *p;
p = strstr(handle->conn->connectpath, mount_point);
if (p != handle->conn->connectpath) {
DBG_WARNING("Warning: the share root (%s) is "
"not a subdirectory of the "
"specified mountpoint (%s). "
"Ignoring provided value.\n",
handle->conn->connectpath,
mount_point);
mount_point = NULL;
}
}
}
if (mount_point != NULL) {
config->mount_point = talloc_strdup(config, mount_point);
if (config->mount_point == NULL) {
DBG_ERR("talloc_strdup() failed\n");
return -1;
}
} else {
config->mount_point = shadow_copy2_find_mount_point(config,
handle);
if (config->mount_point == NULL) {
DBG_WARNING("shadow_copy2_find_mount_point "
"of the share root '%s' failed: %s\n",
handle->conn->connectpath, strerror(errno));
return -1;
}
}
basedir = lp_parm_const_string(SNUM(handle->conn),
"shadow", "basedir", NULL);
if (basedir != NULL) {
if (basedir[0] != '/') {
DBG_WARNING("Warning: 'basedir' is "
"relative ('%s'), but it has to be an "
"absolute path. Disabling basedir.\n",
basedir);
basedir = NULL;
} else {
char *p;
p = strstr(basedir, config->mount_point);
if (p != basedir) {
DEBUG(1, ("Warning: basedir (%s) is not a "
"subdirectory of the share root's "
"mount point (%s). "
"Disabling basedir\n",
basedir, config->mount_point));
basedir = NULL;
}
}
}
if (config->snapdirseverywhere && basedir != NULL) {
DBG_WARNING("Warning: 'basedir' is incompatible "
"with 'snapdirseverywhere'. Disabling basedir.\n");
basedir = NULL;
}
snapsharepath = lp_parm_const_string(SNUM(handle->conn), "shadow",
"snapsharepath", NULL);
if (snapsharepath != NULL) {
if (snapsharepath[0] == '/') {
DBG_WARNING("Warning: 'snapsharepath' is "
"absolute ('%s'), but it has to be a "
"relative path. Disabling snapsharepath.\n",
snapsharepath);
snapsharepath = NULL;
}
if (config->snapdirseverywhere && snapsharepath != NULL) {
DBG_WARNING("Warning: 'snapsharepath' is incompatible "
"with 'snapdirseverywhere'. Disabling "
"snapsharepath.\n");
snapsharepath = NULL;
}
}
if (basedir != NULL && snapsharepath != NULL) {
DBG_WARNING("Warning: 'snapsharepath' is incompatible with "
"'basedir'. Disabling snapsharepath\n");
snapsharepath = NULL;
}
if (snapsharepath != NULL) {
config->rel_connectpath = talloc_strdup(config, snapsharepath);
if (config->rel_connectpath == NULL) {
DBG_ERR("talloc_strdup() failed\n");
errno = ENOMEM;
return -1;
}
}
if (basedir == NULL) {
basedir = config->mount_point;
}
if (config->rel_connectpath == NULL &&
strlen(basedir) < strlen(handle->conn->connectpath)) {
config->rel_connectpath = talloc_strdup(config,
handle->conn->connectpath + strlen(basedir));
if (config->rel_connectpath == NULL) {
DEBUG(0, ("talloc_strdup() failed\n"));
errno = ENOMEM;
return -1;
}
}
if (config->snapdir[0] == '/') {
config->snapdir_absolute = true;
if (config->snapdirseverywhere) {
DBG_WARNING("Warning: An absolute snapdir is "
"incompatible with 'snapdirseverywhere', "
"setting 'snapdirseverywhere' to "
"false.\n");
config->snapdirseverywhere = false;
}
if (config->crossmountpoints) {
DBG_WARNING("Warning: 'crossmountpoints' is not "
"supported with an absolute snapdir. "
"Disabling it.\n");
config->crossmountpoints = false;
}
config->snapshot_basepath = config->snapdir;
} else {
config->snapshot_basepath = talloc_asprintf(config, "%s/%s",
config->mount_point, config->snapdir);
if (config->snapshot_basepath == NULL) {
DEBUG(0, ("talloc_asprintf() failed\n"));
errno = ENOMEM;
return -1;
}
}
trim_string(config->mount_point, NULL, "/");
trim_string(config->rel_connectpath, "/", "/");
trim_string(config->snapdir, NULL, "/");
trim_string(config->snapshot_basepath, NULL, "/");
DEBUG(10, ("shadow_copy2_connect: configuration:\n"
" share root: '%s'\n"
" mountpoint: '%s'\n"
" rel share root: '%s'\n"
" snapdir: '%s'\n"
" snapprefix: '%s'\n"
" delimiter: '%s'\n"
" snapshot base path: '%s'\n"
" format: '%s'\n"
" use sscanf: %s\n"
" snapdirs everywhere: %s\n"
" cross mountpoints: %s\n"
" fix inodes: %s\n"
" sort order: %s\n"
"",
handle->conn->connectpath,
config->mount_point,
config->rel_connectpath,
config->snapdir,
snapprefix,
config->delimiter,
config->snapshot_basepath,
config->gmt_format,
config->use_sscanf ? "yes" : "no",
config->snapdirseverywhere ? "yes" : "no",
config->crossmountpoints ? "yes" : "no",
config->fixinodes ? "yes" : "no",
config->sort_order
));
SMB_VFS_HANDLE_SET_DATA(handle, priv,
NULL, struct shadow_copy2_private,
return -1);
return 0;
}
static struct vfs_fn_pointers vfs_shadow_copy2_fns = {
.connect_fn = shadow_copy2_connect,
.disk_free_fn = shadow_copy2_disk_free,
.get_quota_fn = shadow_copy2_get_quota,
.create_dfs_pathat_fn = shadow_copy2_create_dfs_pathat,
.read_dfs_pathat_fn = shadow_copy2_read_dfs_pathat,
.renameat_fn = shadow_copy2_renameat,
.linkat_fn = shadow_copy2_linkat,
.symlinkat_fn = shadow_copy2_symlinkat,
.stat_fn = shadow_copy2_stat,
.lstat_fn = shadow_copy2_lstat,
.fstat_fn = shadow_copy2_fstat,
.fstatat_fn = shadow_copy2_fstatat,
.openat_fn = shadow_copy2_openat,
.unlinkat_fn = shadow_copy2_unlinkat,
.fchmod_fn = shadow_copy2_fchmod,
.chdir_fn = shadow_copy2_chdir,
.fntimes_fn = shadow_copy2_fntimes,
.readlinkat_fn = shadow_copy2_readlinkat,
.mknodat_fn = shadow_copy2_mknodat,
.realpath_fn = shadow_copy2_realpath,
.get_shadow_copy_data_fn = shadow_copy2_get_shadow_copy_data,
.mkdirat_fn = shadow_copy2_mkdirat,
.fsetxattr_fn = shadow_copy2_fsetxattr,
.fchflags_fn = shadow_copy2_fchflags,
.get_real_filename_at_fn = shadow_copy2_get_real_filename_at,
.pwrite_fn = shadow_copy2_pwrite,
.pwrite_send_fn = shadow_copy2_pwrite_send,
.pwrite_recv_fn = shadow_copy2_pwrite_recv,
.connectpath_fn = shadow_copy2_connectpath,
.parent_pathname_fn = shadow_copy2_parent_pathname,
};
static_decl_vfs;
NTSTATUS vfs_shadow_copy2_init(TALLOC_CTX *ctx)
{
return smb_register_vfs(SMB_VFS_INTERFACE_VERSION,
"shadow_copy2", &vfs_shadow_copy2_fns);
}
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