lib9p

commit 0604313fa77458c4d504f82453a491469a2ccc9b
parent ebcc8cd584bc946e400913e0d2a51640a66c697d
Author: Matsuda Kenji <info@mtkn.jp>
Date:   Sun,  7 Jan 2024 13:24:18 +0900

restrict walk inside the file tree

Diffstat:
M
server.go
 | 
7
+++++--

1 file changed, 5 insertions(+), 2 deletions(-)
diff --git a/server.go b/server.go
@@ -373,6 +373,7 @@ func sFlush(ctx context.Context, c *conn, rc <-chan *request) {
 	}
 }
 
+// TODO: implement MAXWELEM.
 func sWalk(ctx context.Context, c *conn, rc <-chan *request) {
 	for {
 		select {
@@ -421,9 +422,11 @@ func sWalk(ctx context.Context, c *conn, rc <-chan *request) {
 			}
 			wqids = make([]Qid, len(ifcall.Wnames))
 			cwdp = oldFid.path
-			// TODO: replace this block with fs.WalkDir.
 			for i, name := range ifcall.Wnames {
-				cwdp = path.Join(cwdp, name)
+				cwdp = path.Clean(path.Join(cwdp, name))
+				if cwdp == ".." {
+					cwdp = "." // parent of the root is itself.
+				}
 				stat, err := fs.Stat(ExportFS{c.s.fs}, cwdp)
 				if err != nil {
 					break