s3: VFS: gluster: Add vfs_gluster_read_dfs_pathat().

Not yet used.

Signed-off-by: Jeremy Allison <jra@samba.org>
Reviewed-by: Ralph Boehme <slow@samba.org>

1 files changed, 98 insertions, 0 deletions

diff --git a/source3/modules/vfs_glusterfs.c b/source3/modules/vfs_glusterfs.c
index 059aeb42ab5..d4b68fba376 100644
--- a/source3/modules/vfs_glusterfs.c
+++ b/source3/modules/vfs_glusterfs.c
@@ -1933,6 +1933,103 @@ static NTSTATUS vfs_gluster_create_dfs_pathat(struct vfs_handle_struct *handle,
 	return status;
 }
 
+/*
+ * Read and return the contents of a DFS redirect given a
+ * pathname. A caller can pass in NULL for ppreflist and
+ * preferral_count but still determine if this was a
+ * DFS redirect point by getting NT_STATUS_OK back
+ * without incurring the overhead of reading and parsing
+ * the referral contents.
+ */
+
+static NTSTATUS vfs_gluster_read_dfs_pathat(struct vfs_handle_struct *handle,
+				TALLOC_CTX *mem_ctx,
+				struct files_struct *dirfsp,
+				const struct smb_filename *smb_fname,
+				struct referral **ppreflist,
+				size_t *preferral_count)
+{
+	NTSTATUS status = NT_STATUS_NO_MEMORY;
+	size_t bufsize;
+	char *link_target = NULL;
+	int referral_len;
+	bool ok;
+#if defined(HAVE_BROKEN_READLINK)
+	char link_target_buf[PATH_MAX];
+#else
+	char link_target_buf[7];
+#endif
+
+	SMB_ASSERT(dirfsp == dirfsp->conn->cwd_fsp);
+
+	if (ppreflist == NULL && preferral_count == NULL) {
+		/*
+		 * We're only checking if this is a DFS
+		 * redirect. We don't need to return data.
+		 */
+		bufsize = sizeof(link_target_buf);
+		link_target = link_target_buf;
+	} else {
+		bufsize = PATH_MAX;
+		link_target = talloc_array(mem_ctx, char, bufsize);
+		if (!link_target) {
+			goto err;
+		}
+	}
+
+	referral_len = glfs_readlink(handle->data,
+				smb_fname->base_name,
+				link_target,
+				bufsize - 1);
+	if (referral_len < 0) {
+		if (errno == EINVAL) {
+			DBG_INFO("%s is not a link.\n", smb_fname->base_name);
+			status = NT_STATUS_OBJECT_TYPE_MISMATCH;
+		} else {
+			status = map_nt_error_from_unix(errno);
+			DBG_ERR("Error reading "
+				"msdfs link %s: %s\n",
+				smb_fname->base_name,
+				strerror(errno));
+		}
+		goto err;
+	}
+	link_target[referral_len] = '\0';
+
+	DBG_INFO("%s -> %s\n",
+			smb_fname->base_name,
+			link_target);
+
+	if (!strnequal(link_target, "msdfs:", 6)) {
+		status = NT_STATUS_OBJECT_TYPE_MISMATCH;
+		goto err;
+	}
+
+	if (ppreflist == NULL && preferral_count == NULL) {
+		/* Early return for checking if this is a DFS link. */
+		return NT_STATUS_OK;
+	}
+
+	ok = parse_msdfs_symlink(mem_ctx,
+			lp_msdfs_shuffle_referrals(SNUM(handle->conn)),
+			link_target,
+			ppreflist,
+			preferral_count);
+
+	if (ok) {
+		status = NT_STATUS_OK;
+	} else {
+		status = NT_STATUS_NO_MEMORY;
+	}
+
+  err:
+
+	if (link_target != link_target_buf) {
+		TALLOC_FREE(link_target);
+	}
+	return status;
+}
+
 static struct vfs_fn_pointers glusterfs_fns = {
 
 	/* Disk Operations */
@@ -2007,6 +2104,7 @@ static struct vfs_fn_pointers glusterfs_fns = {
 	.get_real_filename_fn = vfs_gluster_get_real_filename,
 	.connectpath_fn = vfs_gluster_connectpath,
 	.create_dfs_pathat_fn = vfs_gluster_create_dfs_pathat,
+	.read_dfs_pathat_fn = vfs_gluster_read_dfs_pathat,
 
 	.brl_lock_windows_fn = NULL,
 	.brl_unlock_windows_fn = NULL,