s3: VFS: Add utility function check_for_converted_path().

Detects an already converted path. Not yet used.

BUG: https://bugzilla.samba.org/show_bug.cgi?id=12531

Signed-off-by: Jeremy Allison <jra@samba.org>
Reviewed-by: Uri Simchoni <uri@samba.org>

diff --git a/source3/modules/vfs_shadow_copy2.c b/source3/modules/vfs_shadow_copy2.c
index 2206edefccc1697bb8b9846daaca7c304ab62c2f..d6100ac5bb2b39f45d7e7a718ec5da9f0b89034b 100644 (file)
--- a/source3/modules/vfs_shadow_copy2.c
+++ b/source3/modules/vfs_shadow_copy2.c
@@ -452,6 +452,114 @@ static bool make_relative_path(const char *cwd, char *abs_path)
        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;
+}
+
 /**
  * Strip a snapshot component from a filename as
  * handed in via the smb layer.