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-rw-r--r--source3/modules/vfs_shadow_copy2.c147
1 files changed, 126 insertions, 21 deletions
diff --git a/source3/modules/vfs_shadow_copy2.c b/source3/modules/vfs_shadow_copy2.c
index eac83fca74..61f71b7bbc 100644
--- a/source3/modules/vfs_shadow_copy2.c
+++ b/source3/modules/vfs_shadow_copy2.c
@@ -76,31 +76,99 @@ static int vfs_shadow_copy2_debug_level = DBGC_VFS;
/*
make very sure it is one of our special names
*/
-static inline bool shadow_copy2_match_name(const char *name)
+static inline bool shadow_copy2_match_name(const char *name, const char **gmt_start)
{
unsigned year, month, day, hr, min, sec;
- if (name[0] != '@') return False;
- if (strncmp(name, "@GMT-", 5) != 0) return False;
- if (sscanf(name, "@GMT-%04u.%02u.%02u-%02u.%02u.%02u", &year, &month,
+ const char *p;
+ if (gmt_start) {
+ (*gmt_start) = NULL;
+ }
+ p = strstr_m(name, "@GMT-");
+ if (p == NULL) return false;
+ if (p > name && p[-1] != '/') return False;
+ if (sscanf(p, "@GMT-%04u.%02u.%02u-%02u.%02u.%02u", &year, &month,
&day, &hr, &min, &sec) != 6) {
return False;
}
- if (name[24] != 0 && name[24] != '/') {
+ if (p[24] != 0 && p[24] != '/') {
return False;
}
+ if (gmt_start) {
+ (*gmt_start) = p;
+ }
return True;
}
/*
+ shadow copy paths can also come into the server in this form:
+
+ /foo/bar/@GMT-XXXXX/some/file
+
+ This function normalises the filename to be of the form:
+
+ @GMT-XXXX/foo/bar/some/file
+ */
+static const char *shadow_copy2_normalise_path(TALLOC_CTX *mem_ctx, const char *path, const char *gmt_start)
+{
+ char *pcopy;
+ char buf[GMT_NAME_LEN];
+ size_t prefix_len;
+
+ if (path == gmt_start) {
+ return path;
+ }
+
+ prefix_len = gmt_start - path - 1;
+
+ DEBUG(10, ("path=%s, gmt_start=%s, prefix_len=%d\n", path, gmt_start,
+ (int)prefix_len));
+
+ /*
+ * We've got a/b/c/@GMT-YYYY.MM.DD-HH.MM.SS/d/e. convert to
+ * @GMT-YYYY.MM.DD-HH.MM.SS/a/b/c/d/e before further
+ * processing. As many VFS calls provide a const char *,
+ * unfortunately we have to make a copy.
+ */
+
+ pcopy = talloc_strdup(talloc_tos(), path);
+ if (pcopy == NULL) {
+ return NULL;
+ }
+
+ gmt_start = pcopy + prefix_len;
+
+ /*
+ * Copy away "@GMT-YYYY.MM.DD-HH.MM.SS"
+ */
+ memcpy(buf, gmt_start+1, GMT_NAME_LEN);
+
+ /*
+ * Make space for it including a trailing /
+ */
+ memmove(pcopy + GMT_NAME_LEN + 1, pcopy, prefix_len);
+
+ /*
+ * Move in "@GMT-YYYY.MM.DD-HH.MM.SS/" at the beginning again
+ */
+ memcpy(pcopy, buf, GMT_NAME_LEN);
+ pcopy[GMT_NAME_LEN] = '/';
+
+ DEBUG(10, ("shadow_copy2_normalise_path: %s -> %s\n", path, pcopy));
+
+ return pcopy;
+}
+
+/*
convert a name to the shadow directory
*/
#define _SHADOW2_NEXT(op, args, rtype, eret, extra) do { \
const char *name = fname; \
- if (shadow_copy2_match_name(fname)) { \
+ const char *gmt_start; \
+ if (shadow_copy2_match_name(fname, &gmt_start)) { \
char *name2; \
rtype ret; \
- name2 = convert_shadow2_name(handle, fname); \
+ name2 = convert_shadow2_name(handle, fname, gmt_start); \
if (name2 == NULL) { \
errno = EINVAL; \
return eret; \
@@ -116,11 +184,12 @@ static inline bool shadow_copy2_match_name(const char *name)
} while (0)
#define _SHADOW2_NEXT_SMB_FNAME(op, args, rtype, eret, extra) do { \
- if (shadow_copy2_match_name(smb_fname->base_name)) { \
+ const char *gmt_start; \
+ if (shadow_copy2_match_name(smb_fname->base_name, &gmt_start)) { \
char *name2; \
char *smb_base_name_tmp = NULL; \
rtype ret; \
- name2 = convert_shadow2_name(handle, smb_fname->base_name); \
+ name2 = convert_shadow2_name(handle, smb_fname->base_name, gmt_start); \
if (name2 == NULL) { \
errno = EINVAL; \
return eret; \
@@ -143,10 +212,11 @@ static inline bool shadow_copy2_match_name(const char *name)
#define _SHADOW2_NTSTATUS_NEXT(op, args, eret, extra) do { \
const char *name = fname; \
- if (shadow_copy2_match_name(fname)) { \
+ const char *gmt_start; \
+ if (shadow_copy2_match_name(fname, &gmt_start)) { \
char *name2; \
NTSTATUS ret; \
- name2 = convert_shadow2_name(handle, fname); \
+ name2 = convert_shadow2_name(handle, fname, gmt_start); \
if (name2 == NULL) { \
errno = EINVAL; \
return eret; \
@@ -168,7 +238,9 @@ static inline bool shadow_copy2_match_name(const char *name)
#define SHADOW2_NEXT_SMB_FNAME(op, args, rtype, eret) _SHADOW2_NEXT_SMB_FNAME(op, args, rtype, eret, )
#define SHADOW2_NEXT2(op, args) do { \
- if (shadow_copy2_match_name(oldname) || shadow_copy2_match_name(newname)) { \
+ const char *gmt_start1, *gmt_start2; \
+ if (shadow_copy2_match_name(oldname, &gmt_start1) || \
+ shadow_copy2_match_name(newname, &gmt_start2)) { \
errno = EROFS; \
return -1; \
} else { \
@@ -177,8 +249,9 @@ static inline bool shadow_copy2_match_name(const char *name)
} while (0)
#define SHADOW2_NEXT2_SMB_FNAME(op, args) do { \
- if (shadow_copy2_match_name(smb_fname_src->base_name) || \
- shadow_copy2_match_name(smb_fname_dst->base_name)) { \
+ const char *gmt_start1, *gmt_start2; \
+ if (shadow_copy2_match_name(smb_fname_src->base_name, &gmt_start1) || \
+ shadow_copy2_match_name(smb_fname_dst->base_name, &gmt_start2)) { \
errno = EROFS; \
return -1; \
} else { \
@@ -267,7 +340,7 @@ static const char *shadow_copy2_find_basedir(TALLOC_CTX *mem_ctx, vfs_handle_str
convert a filename from a share relative path, to a path in the
snapshot directory
*/
-static char *convert_shadow2_name(vfs_handle_struct *handle, const char *fname)
+static char *convert_shadow2_name(vfs_handle_struct *handle, const char *fname, const char *gmt_path)
{
TALLOC_CTX *tmp_ctx = talloc_new(handle->data);
const char *snapdir, *relpath, *baseoffset, *basedir;
@@ -288,6 +361,14 @@ static char *convert_shadow2_name(vfs_handle_struct *handle, const char *fname)
return NULL;
}
+ if (strncmp(fname, "@GMT-", 5) != 0) {
+ fname = shadow_copy2_normalise_path(tmp_ctx, fname, gmt_path);
+ if (fname == NULL) {
+ talloc_free(tmp_ctx);
+ return NULL;
+ }
+ }
+
relpath = fname + GMT_NAME_LEN;
baselen = strlen(basedir);
baseoffset = handle->conn->connectpath + baselen;
@@ -406,7 +487,7 @@ static int shadow_copy2_lstat(vfs_handle_struct *handle,
static int shadow_copy2_fstat(vfs_handle_struct *handle, files_struct *fsp, SMB_STRUCT_STAT *sbuf)
{
int ret = SMB_VFS_NEXT_FSTAT(handle, fsp, sbuf);
- if (ret == 0 && shadow_copy2_match_name(fsp->fsp_name->base_name)) {
+ if (ret == 0 && shadow_copy2_match_name(fsp->fsp_name->base_name, NULL)) {
convert_sbuf(handle, fsp->fsp_name->base_name, sbuf);
}
return ret;
@@ -476,8 +557,24 @@ static int shadow_copy2_mknod(vfs_handle_struct *handle,
static char *shadow_copy2_realpath(vfs_handle_struct *handle,
const char *fname, char *resolved_path)
{
- if (shadow_copy2_match_name(fname) && (fname[GMT_NAME_LEN] == '\0')) {
- return SMB_VFS_NEXT_REALPATH(handle, ".", resolved_path);
+ const char *gmt;
+
+ if (shadow_copy2_match_name(fname, &gmt)
+ && (gmt[GMT_NAME_LEN] == '\0')) {
+ char *copy, *result;
+
+ copy = talloc_strdup(talloc_tos(), fname);
+ if (copy == NULL) {
+ errno = ENOMEM;
+ return NULL;
+ }
+
+ copy[gmt - fname] = '.';
+
+ DEBUG(10, ("calling NEXT_REALPATH with %s\n", copy));
+ result = SMB_VFS_NEXT_REALPATH(handle, copy, resolved_path);
+ TALLOC_FREE(copy);
+ return result;
}
SHADOW2_NEXT(REALPATH, (handle, name, resolved_path), char *, NULL);
}
@@ -486,14 +583,22 @@ static const char *shadow_copy2_connectpath(struct vfs_handle_struct *handle,
const char *fname)
{
TALLOC_CTX *tmp_ctx = talloc_stackframe();
- const char *snapdir, *baseoffset, *basedir;
+ const char *snapdir, *baseoffset, *basedir, *gmt_start;
size_t baselen;
char *ret;
- if (!shadow_copy2_match_name(fname)) {
+ DEBUG(10, ("shadow_copy2_connectpath called with %s\n", fname));
+
+ if (!shadow_copy2_match_name(fname, &gmt_start)) {
return handle->conn->connectpath;
}
+ fname = shadow_copy2_normalise_path(talloc_tos(), fname, gmt_start);
+ if (fname == NULL) {
+ TALLOC_FREE(tmp_ctx);
+ return NULL;
+ }
+
snapdir = shadow_copy2_find_snapdir(tmp_ctx, handle);
if (snapdir == NULL) {
DEBUG(2,("no snapdir found for share at %s\n",
@@ -644,7 +749,7 @@ static int shadow_copy2_get_shadow_copy2_data(vfs_handle_struct *handle,
SHADOW_COPY_LABEL *tlabels;
/* ignore names not of the right form in the snapshot directory */
- if (!shadow_copy2_match_name(d->d_name)) {
+ if (!shadow_copy2_match_name(d->d_name, NULL)) {
continue;
}
generated by cgit (git 2.34.1) at 2024-12-18 05:32:18 +0000