/*
- * Third attempt at a shadow copy module
+ * 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
*
* 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
*/
/*
-
- This is a 3rd 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
-
- 3) shadow copy results can be sorted before being sent to the
- client. This is beneficial for filesystems that don't read
- directories alphabetically (the default unix).
-
- 4) vanity naming for snapshots. Snapshots can be named in any
- format compatible with str[fp]time conversions.
-
- 5) time stamps in snapshot names can be represented in localtime
- rather than UTC.
-
- 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.
-
- shadow:sort = asc/desc, or not specified for unsorted (default)
-
- This is an optional parameter that specifies that the shadow
- copy directories should be sorted before sending them to the
- client. This can be beneficial as unix filesystems are usually
- not listed alphabetically sorted. If enabled, you typically
- want to specify descending order.
-
- shadow:format = <format specification for snapshot names>
-
- This is an optional parameter that specifies the format
- specification for the naming of snapshots. The format must
- be compatible with the conversion specifications recognized
- by str[fp]time. The default value is "@GMT-%Y.%m.%d-%H.%M.%S".
-
- shadow:sscanf = yes/no (default is no)
-
- The time is the unsigned long integer (%lu) in the format string
- rather than a time strptime() can parse. The result must be a unix time_t
- time.
-
- shadow:localtime = yes/no (default is no)
-
- This is an optional parameter that indicates whether the
- snapshot names are in UTC/GMT or the local time.
-
-
- The following command would generate a correctly formatted directory name
- for use with the default parameters:
- date -u +@GMT-%Y.%m.%d-%H.%M.%S
+ * This is a second implemetation 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 <ccan/hash/hash.h>
#include "util_tdb.h"
+struct shadow_copy2_config {
+ char *gmt_format;
+ bool use_sscanf;
+ bool use_localtime;
+ char *snapdir;
+ 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 */
+};
+
static bool shadow_copy2_find_slashes(TALLOC_CTX *mem_ctx, const char *str,
size_t **poffsets,
unsigned *pnum_offsets)
}
/**
- * Given a timstamp, 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.
+ * Given a timestamp, build the posix level GMT-tag string
+ * based on the configurable format.
*/
-static char *shadow_copy2_insert_string(TALLOC_CTX *mem_ctx,
- struct vfs_handle_struct *handle,
- time_t snapshot)
+static size_t shadow_copy2_posix_gmt_string(struct vfs_handle_struct *handle,
+ time_t snapshot,
+ char *snaptime_string,
+ size_t len)
{
- const char *fmt;
struct tm snap_tm;
- fstring snaptime_string;
size_t snaptime_len;
+ struct shadow_copy2_config *config;
- fmt = lp_parm_const_string(SNUM(handle->conn), "shadow",
- "format", GMT_FORMAT);
+ SMB_VFS_HANDLE_GET_DATA(handle, config, struct shadow_copy2_config,
+ return 0);
- if (lp_parm_bool(SNUM(handle->conn), "shadow", "sscanf", false)) {
- snaptime_len = snprintf(snaptime_string, sizeof(snaptime_string), fmt,
- (unsigned long)snapshot);
+ 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 NULL;
+ return snaptime_len;
}
} else {
- if (lp_parm_bool(SNUM(handle->conn), "shadow", "localtime", false)) {
+ if (config->use_localtime) {
if (localtime_r(&snapshot, &snap_tm) == 0) {
DEBUG(10, ("gmtime_r failed\n"));
- return NULL;
+ return -1;
}
} else {
if (gmtime_r(&snapshot, &snap_tm) == 0) {
DEBUG(10, ("gmtime_r failed\n"));
- return NULL;
+ return -1;
}
}
- snaptime_len = strftime(snaptime_string, sizeof(snaptime_string), fmt,
- &snap_tm);
+ snaptime_len = strftime(snaptime_string,
+ len,
+ config->gmt_format,
+ &snap_tm);
if (snaptime_len == 0) {
DEBUG(10, ("strftime failed\n"));
- return NULL;
+ return 0;
}
}
- return talloc_asprintf(mem_ctx, "/%s/%s",
- lp_parm_const_string(
- SNUM(handle->conn), "shadow", "snapdir",
- ".snapshots"),
- snaptime_string);
+
+ return snaptime_len;
}
/**
- * Strip a snapshot component from an filename as
+ * 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 inital 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;
+ size_t snaptime_len = 0;
+ char *result = NULL;
+ struct shadow_copy2_config *config;
+
+ SMB_VFS_HANDLE_GET_DATA(handle, config, struct shadow_copy2_config,
+ return NULL);
+
+ 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) {
+ DEBUG(1, (__location__ " 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;
+ size_t snaptime_len = 0;
+ char *result = NULL;
+ struct shadow_copy2_config *config;
+
+ SMB_VFS_HANDLE_GET_DATA(handle, config, struct shadow_copy2_config,
+ 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",
+ config->snapshot_basepath, snaptime_string);
+ if (result == NULL) {
+ DEBUG(1, (__location__ " talloc_asprintf failed\n"));
+ }
+
+ return result;
+}
+
+/**
+ * Strip a snapshot component from a filename as
* handed in via the smb layer.
* Returns the parsed timestamp and the stripped filename.
*/
char *q;
char *stripped;
size_t rest_len, dst_len;
+ struct shadow_copy2_config *config;
+ const char *snapdir;
+ ssize_t snapdirlen;
+ ptrdiff_t len_before_gmt;
+
+ SMB_VFS_HANDLE_GET_DATA(handle, config, struct shadow_copy2_config,
+ return false);
+
+ DEBUG(10, (__location__ ": enter path '%s'\n", name));
p = strstr_m(name, "@GMT-");
if (p == NULL) {
+ DEBUG(11, ("@GMT not found\n"));
goto no_snapshot;
}
if ((p > name) && (p[-1] != '/')) {
+ /* the GMT-token does not start a path-component */
+ DEBUG(10, ("not at start, p=%p, name=%p, p[-1]=%d\n",
+ p, name, (int)p[-1]));
goto no_snapshot;
}
+
+ /*
+ * Figure out whether we got an already converted string. One
+ * case where this happens is in a smb2 create call with the
+ * mxac create blob set. We do the get_acl call on
+ * fsp->fsp_name, which is already converted. We are converted
+ * if we got a file name of the form ".snapshots/@GMT-",
+ * i.e. ".snapshots/" precedes "p".
+ */
+
+ snapdir = lp_parm_const_string(SNUM(handle->conn), "shadow", "snapdir",
+ ".snapshots");
+ snapdirlen = strlen(snapdir);
+ len_before_gmt = p - name;
+
+ if ((len_before_gmt >= (snapdirlen + 1)) && (p[-1] == '/')) {
+ const char *parent_snapdir = p - (snapdirlen+1);
+
+ DEBUG(10, ("parent_snapdir = %s\n", parent_snapdir));
+
+ if (strncmp(parent_snapdir, snapdir, snapdirlen) == 0) {
+ DEBUG(10, ("name=%s is already converted\n", name));
+ goto no_snapshot;
+ }
+ }
q = strptime(p, GMT_FORMAT, &tm);
if (q == NULL) {
+ DEBUG(10, ("strptime failed\n"));
goto no_snapshot;
}
tm.tm_isdst = -1;
timestamp = timegm(&tm);
if (timestamp == (time_t)-1) {
+ DEBUG(10, ("timestamp==-1\n"));
goto no_snapshot;
}
- if ((p == name) && (q[0] == '\0')) {
+ if (q[0] == '\0') {
+ /*
+ * The name consists of only the GMT token or the GMT
+ * token is at the end of the path. XP seems to send
+ * @GMT- at the end under certain circumstances even
+ * with a path prefix.
+ */
if (pstripped != NULL) {
- stripped = talloc_strdup(mem_ctx, "");
+ stripped = talloc_strndup(mem_ctx, name, p - name);
if (stripped == NULL) {
return false;
}
return true;
}
if (q[0] != '/') {
+ /*
+ * It is not a complete path component, i.e. the path
+ * component continues after the gmt-token.
+ */
+ DEBUG(10, ("q[0] = %d\n", (int)q[0]));
goto no_snapshot;
}
q += 1;
rest_len = strlen(q);
dst_len = (p-name) + rest_len;
- if (lp_parm_bool(SNUM(handle->conn), "shadow", "snapdirseverywhere",
- false)) {
+ if (config->snapdirseverywhere) {
char *insert;
bool have_insert;
insert = shadow_copy2_insert_string(talloc_tos(), handle,
return false;
}
+ DEBUG(10, (__location__ ": snapdirseverywhere mode.\n"
+ "path '%s'.\n"
+ "insert string '%s'\n", name, insert));
+
have_insert = (strstr(name, insert+1) != NULL);
- TALLOC_FREE(insert);
+ DEBUG(10, ("have_insert=%d, name=%s, insert+1=%s\n",
+ (int)have_insert, name, insert+1));
if (have_insert) {
+ DEBUG(10, (__location__ ": insert string '%s' found in "
+ "path '%s' found in snapdirseverywhere mode "
+ "==> already converted\n", insert, name));
+ TALLOC_FREE(insert);
+ goto no_snapshot;
+ }
+ TALLOC_FREE(insert);
+ } else {
+ char *snapshot_path;
+ char *s;
+
+ snapshot_path = shadow_copy2_snapshot_path(talloc_tos(),
+ handle,
+ timestamp);
+ if (snapshot_path == NULL) {
+ errno = ENOMEM;
+ return false;
+ }
+
+ DEBUG(10, (__location__ " path: '%s'.\n"
+ "snapshot path: '%s'\n", name, snapshot_path));
+
+ s = strstr(name, snapshot_path);
+ if (s == name) {
+ /*
+ * this starts with "snapshot_basepath/GMT-Token"
+ * so it is already a converted absolute
+ * path. Don't process further.
+ */
+ DEBUG(10, (__location__ ": path '%s' starts with "
+ "snapshot path '%s' (not in "
+ "snapdirseverywhere mode) ==> "
+ "already converted\n", name, snapshot_path));
+ talloc_free(snapshot_path);
goto no_snapshot;
}
+ talloc_free(snapshot_path);
}
if (pstripped != NULL) {
* 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_convert(TALLOC_CTX *mem_ctx,
- struct vfs_handle_struct *handle,
- const char *name, time_t timestamp)
+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 pathlen;
char *insert = NULL;
char *converted = NULL;
- size_t insertlen;
+ size_t insertlen, connectlen = 0;
int i, saved_errno;
size_t min_offset;
+ struct shadow_copy2_config *config;
+ size_t in_share_offset = 0;
+
+ SMB_VFS_HANDLE_GET_DATA(handle, config, struct shadow_copy2_config,
+ return NULL);
+
+ 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;
+ }
- path = talloc_asprintf(mem_ctx, "%s/%s", handle->conn->connectpath,
- name);
+ ZERO_STRUCT(converted_fname);
+ converted_fname.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;
- DEBUG(10, ("converting %s\n", path));
-
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 deliberatly 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;
min_offset = 0;
- if (!lp_parm_bool(SNUM(handle->conn), "shadow", "crossmountpoints",
- false)) {
- char *mount_point;
-
- mount_point = shadow_copy2_find_mount_point(talloc_tos(),
- handle);
- if (mount_point == NULL) {
- goto fail;
- }
- min_offset = strlen(mount_point);
- TALLOC_FREE(mount_point);
+ if (!config->crossmountpoints) {
+ min_offset = strlen(config->mount_point);
}
memcpy(converted, path, pathlen+1);
goto fail;
}
+ if (offset >= connectlen) {
+ in_share_offset = offset;
+ }
+
memcpy(converted+offset, insert, insertlen);
offset += insertlen;
ret = SMB_VFS_NEXT_LSTAT(handle, &converted_fname);
- DEBUG(10, ("Trying %s: %d (%s)\n", converted,
+ 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) {
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)
{
- if (lp_parm_bool(SNUM(handle->conn), "shadow", "fixinodes", False)) {
+ struct shadow_copy2_config *config;
+
+ SMB_VFS_HANDLE_GET_DATA(handle, config, struct shadow_copy2_config,
+ return);
+
+ if (config->fixinodes) {
/* 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
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 = hash(fname, strlen(fname), 0) & 0xFF000000;
+ shash = tdb_jenkins_hash(&key) & 0xFF000000;
if (shash == 0) {
shash = 1;
}
static DIR *shadow_copy2_opendir(vfs_handle_struct *handle,
const char *fname,
const char *mask,
- uint32 attr)
+ uint32_t attr)
{
time_t timestamp;
char *stripped;
char *stripped = NULL;
char *tmp = NULL;
char *result = NULL;
- char *inserted = NULL;
- char *inserted_to, *inserted_end;
int saved_errno;
if (!shadow_copy2_strip_snapshot(talloc_tos(), handle, fname,
}
result = SMB_VFS_NEXT_REALPATH(handle, tmp);
- if (result == NULL) {
- goto done;
- }
-
- /*
- * Take away what we've inserted. This removes the @GMT-thingy
- * completely, but will give a path under the share root.
- */
- inserted = shadow_copy2_insert_string(talloc_tos(), handle, timestamp);
- if (inserted == NULL) {
- goto done;
- }
- inserted_to = strstr_m(result, inserted);
- if (inserted_to == NULL) {
- DEBUG(2, ("SMB_VFS_NEXT_REALPATH removed %s\n", inserted));
- goto done;
- }
- inserted_end = inserted_to + talloc_get_size(inserted) - 1;
- memmove(inserted_to, inserted_end, strlen(inserted_end)+1);
done:
saved_errno = errno;
- TALLOC_FREE(inserted);
TALLOC_FREE(tmp);
TALLOC_FREE(stripped);
errno = saved_errno;
{
struct smb_filename smb_fname;
int ret;
+ struct shadow_copy2_config *config;
+
+ SMB_VFS_HANDLE_GET_DATA(handle, config, struct shadow_copy2_config,
+ return NULL);
ZERO_STRUCT(smb_fname);
- smb_fname.base_name = talloc_asprintf(
- talloc_tos(), "%s/%s", path,
- lp_parm_const_string(SNUM(handle->conn), "shadow", "snapdir",
- ".snapshots"));
+ smb_fname.base_name = talloc_asprintf(talloc_tos(), "%s/%s",
+ path, config->snapdir);
if (smb_fname.base_name == NULL) {
return NULL;
}
return NULL;
}
+static bool check_access_snapdir(struct vfs_handle_struct *handle,
+ const char *path)
+{
+ struct smb_filename smb_fname;
+ int ret;
+ NTSTATUS status;
+
+ ZERO_STRUCT(smb_fname);
+ smb_fname.base_name = talloc_asprintf(talloc_tos(),
+ "%s",
+ path);
+ if (smb_fname.base_name == NULL) {
+ return false;
+ }
+
+ ret = SMB_VFS_NEXT_STAT(handle, &smb_fname);
+ if (ret != 0 || !S_ISDIR(smb_fname.st.st_ex_mode)) {
+ TALLOC_FREE(smb_fname.base_name);
+ return false;
+ }
+
+ status = smbd_check_access_rights(handle->conn,
+ &smb_fname,
+ false,
+ SEC_DIR_LIST);
+ if (!NT_STATUS_IS_OK(status)) {
+ DEBUG(0,("user does not have list permission "
+ "on snapdir %s\n",
+ smb_fname.base_name));
+ TALLOC_FREE(smb_fname.base_name);
+ return false;
+ }
+ TALLOC_FREE(smb_fname.base_name);
+ return true;
+}
+
/**
* Find the snapshot directory (if any) for the given
* filename (which is relative to the share).
*/
-static char *shadow_copy2_find_snapdir(TALLOC_CTX *mem_ctx,
- struct vfs_handle_struct *handle,
- struct smb_filename *smb_fname)
+static const char *shadow_copy2_find_snapdir(TALLOC_CTX *mem_ctx,
+ struct vfs_handle_struct *handle,
+ struct smb_filename *smb_fname)
{
char *path, *p;
- char *snapdir;
+ const char *snapdir;
+ struct shadow_copy2_config *config;
+
+ SMB_VFS_HANDLE_GET_DATA(handle, config, struct shadow_copy2_config,
+ return NULL);
+
+ /*
+ * 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,
time_t timestamp_t;
unsigned long int timestamp_long;
const char *fmt;
+ struct shadow_copy2_config *config;
- fmt = lp_parm_const_string(SNUM(handle->conn), "shadow",
- "format", GMT_FORMAT);
+ SMB_VFS_HANDLE_GET_DATA(handle, config, struct shadow_copy2_config,
+ return NULL);
+
+ fmt = config->gmt_format;
ZERO_STRUCT(timestamp);
- if (lp_parm_bool(SNUM(handle->conn), "shadow", "sscanf", false)) {
+ if (config->use_sscanf) {
if (sscanf(name, fmt, ×tamp_long) != 1) {
DEBUG(10, ("shadow_copy2_snapshot_to_gmt: "
"no sscanf match %s: %s\n",
DEBUG(10, ("shadow_copy2_snapshot_to_gmt: match %s: %s\n",
fmt, name));
- if (lp_parm_bool(SNUM(handle->conn), "shadow", "localtime", false)) {
+ if (config->use_localtime) {
timestamp.tm_isdst = -1;
timestamp_t = mktime(×tamp);
gmtime_r(×tamp_t, ×tamp);
{
int (*cmpfunc)(const void *, const void *);
const char *sort;
+ struct shadow_copy2_config *config;
+
+ SMB_VFS_HANDLE_GET_DATA(handle, config, struct shadow_copy2_config,
+ return);
- sort = lp_parm_const_string(SNUM(handle->conn), "shadow",
- "sort", "desc");
+ sort = config->sort_order;
if (sort == NULL) {
return;
}
const char *snapdir;
struct dirent *d;
TALLOC_CTX *tmp_ctx = talloc_stackframe();
+ bool ret;
snapdir = shadow_copy2_find_snapdir(tmp_ctx, handle, fsp->fsp_name);
if (snapdir == NULL) {
talloc_free(tmp_ctx);
return -1;
}
+ ret = check_access_snapdir(handle, snapdir);
+ if (!ret) {
+ DEBUG(0,("access denied on listing snapdir %s\n", snapdir));
+ errno = EACCES;
+ talloc_free(tmp_ctx);
+ return -1;
+ }
p = SMB_VFS_NEXT_OPENDIR(handle, snapdir, NULL, 0);
static NTSTATUS shadow_copy2_fget_nt_acl(vfs_handle_struct *handle,
struct files_struct *fsp,
- uint32 security_info,
+ uint32_t security_info,
TALLOC_CTX *mem_ctx,
struct security_descriptor **ppdesc)
{
static NTSTATUS shadow_copy2_get_nt_acl(vfs_handle_struct *handle,
const char *fname,
- uint32 security_info,
+ uint32_t security_info,
TALLOC_CTX *mem_ctx,
struct security_descriptor **ppdesc)
{
int saved_errno;
char *conv;
+ DEBUG(10, ("shadow_copy2_get_real_filename called for path=[%s], "
+ "name=[%s]\n", path, name));
+
if (!shadow_copy2_strip_snapshot(talloc_tos(), handle, path,
×tamp, &stripped)) {
+ DEBUG(10, ("shadow_copy2_strip_snapshot failed\n"));
return -1;
}
if (timestamp == 0) {
+ DEBUG(10, ("timestamp == 0\n"));
return SMB_VFS_NEXT_GET_REAL_FILENAME(handle, path, name,
mem_ctx, found_name);
}
- if (stripped[0] == '\0') {
- *found_name = talloc_strdup(mem_ctx, name);
- if (*found_name == NULL) {
- errno = ENOMEM;
- return -1;
- }
- return 0;
- }
conv = shadow_copy2_convert(talloc_tos(), handle, stripped, timestamp);
TALLOC_FREE(stripped);
if (conv == NULL) {
+ DEBUG(10, ("shadow_copy2_convert failed\n"));
return -1;
}
+ DEBUG(10, ("Calling NEXT_GET_REAL_FILE_NAME for conv=[%s], "
+ "name=[%s]\n", conv, name));
ret = SMB_VFS_NEXT_GET_REAL_FILENAME(handle, conv, name,
mem_ctx, found_name);
+ DEBUG(10, ("NEXT_REAL_FILE_NAME returned %d\n", (int)ret));
saved_errno = errno;
TALLOC_FREE(conv);
errno = saved_errno;
return ret;
}
+static const char *shadow_copy2_connectpath(struct vfs_handle_struct *handle,
+ const char *fname)
+{
+ time_t timestamp;
+ char *stripped = NULL;
+ char *tmp = NULL;
+ char *result = NULL;
+ int saved_errno;
+ size_t rootpath_len = 0;
+
+ DBG_DEBUG("Calc connect path for [%s]\n", fname);
+
+ if (!shadow_copy2_strip_snapshot(talloc_tos(), handle, fname,
+ ×tamp, &stripped)) {
+ goto done;
+ }
+ if (timestamp == 0) {
+ return SMB_VFS_NEXT_CONNECTPATH(handle, fname);
+ }
+
+ tmp = shadow_copy2_do_convert(talloc_tos(), handle, stripped, 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';
+ result = SMB_VFS_NEXT_REALPATH(handle, tmp);
+ if (result == NULL) {
+ goto done;
+ }
+
+ DBG_DEBUG("connect path is [%s]\n", result);
+
+done:
+ saved_errno = errno;
+ TALLOC_FREE(tmp);
+ TALLOC_FREE(stripped);
+ errno = saved_errno;
+ return result;
+}
+
+static uint64_t shadow_copy2_disk_free(vfs_handle_struct *handle,
+ const char *path, uint64_t *bsize,
+ uint64_t *dfree, uint64_t *dsize)
+{
+ time_t timestamp;
+ char *stripped;
+ ssize_t ret;
+ int saved_errno;
+ char *conv;
+
+ if (!shadow_copy2_strip_snapshot(talloc_tos(), handle, path,
+ ×tamp, &stripped)) {
+ return -1;
+ }
+ if (timestamp == 0) {
+ return SMB_VFS_NEXT_DISK_FREE(handle, path,
+ bsize, dfree, dsize);
+ }
+
+ conv = shadow_copy2_convert(talloc_tos(), handle, stripped, timestamp);
+ TALLOC_FREE(stripped);
+ if (conv == NULL) {
+ return -1;
+ }
+
+ ret = SMB_VFS_NEXT_DISK_FREE(handle, conv, bsize, dfree, dsize);
+
+ saved_errno = errno;
+ TALLOC_FREE(conv);
+ errno = saved_errno;
+
+ return ret;
+}
+
+static int shadow_copy2_connect(struct vfs_handle_struct *handle,
+ const char *service, const char *user)
+{
+ struct shadow_copy2_config *config;
+ int ret;
+ const char *snapdir;
+ const char *gmt_format;
+ const char *sort_order;
+ const char *basedir = NULL;
+ const char *mount_point;
+
+ DEBUG(10, (__location__ ": cnum[%u], connectpath[%s]\n",
+ (unsigned)handle->conn->cnum,
+ handle->conn->connectpath));
+
+ ret = SMB_VFS_NEXT_CONNECT(handle, service, user);
+ if (ret < 0) {
+ return ret;
+ }
+
+ config = talloc_zero(handle->conn, struct shadow_copy2_config);
+ if (config == NULL) {
+ DEBUG(0, ("talloc_zero() failed\n"));
+ errno = ENOMEM;
+ return -1;
+ }
+
+ 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->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;
+ }
+
+ 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] != '/') {
+ DEBUG(1, (__location__ " 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) {
+ DEBUG(0, (__location__ " 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] != '/') {
+ DEBUG(1, (__location__ " 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) {
+ DEBUG(1, (__location__ " Warning: 'basedir' is incompatible "
+ "with 'snapdirseverywhere'. Disabling basedir.\n"));
+ basedir = NULL;
+ }
+
+ if (basedir == NULL) {
+ basedir = config->mount_point;
+ }
+
+ if (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 == true) {
+ DEBUG(1, (__location__ " Warning: An absolute snapdir "
+ "is incompatible with 'snapdirseverywhere', "
+ "setting 'snapdirseverywhere' to false.\n"));
+ config->snapdirseverywhere = false;
+ }
+
+ if (config->crossmountpoints == true) {
+ DEBUG(1, (__location__ " 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;
+ }
+ }
+
+ DEBUG(10, ("shadow_copy2_connect: configuration:\n"
+ " share root: '%s'\n"
+ " mountpoint: '%s'\n"
+ " rel share root: '%s'\n"
+ " snapdir: '%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,
+ 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, config,
+ NULL, struct shadow_copy2_config,
+ return -1);
+
+ return 0;
+}
static struct vfs_fn_pointers vfs_shadow_copy2_fns = {
+ .connect_fn = shadow_copy2_connect,
.opendir_fn = shadow_copy2_opendir,
+ .disk_free_fn = shadow_copy2_disk_free,
.rename_fn = shadow_copy2_rename,
.link_fn = shadow_copy2_link,
.symlink_fn = shadow_copy2_symlink,
.chmod_acl_fn = shadow_copy2_chmod_acl,
.chflags_fn = shadow_copy2_chflags,
.get_real_filename_fn = shadow_copy2_get_real_filename,
+ .connectpath_fn = shadow_copy2_connectpath,
};
NTSTATUS vfs_shadow_copy2_init(void);
git.samba.org / obnox / samba / samba-obnox.git / blobdiff