From 35055030a13150eeb5cd2413b4597c56e60c9605 Mon Sep 17 00:00:00 2001
From: Jakob Unterwurzacher <jakobunt@gmail.com>
Date: Sat, 15 Aug 2020 15:08:28 +0200
Subject: [PATCH] v2api/reverse: implement ctlsocksrv.Interface

---
 .../fusefrontend_reverse/ctlsock_interface.go | 39 +++++++++++++++++++
 1 file changed, 39 insertions(+)
 create mode 100644 internal/fusefrontend_reverse/ctlsock_interface.go

diff --git a/internal/fusefrontend_reverse/ctlsock_interface.go b/internal/fusefrontend_reverse/ctlsock_interface.go
new file mode 100644
index 0000000..6bf2e6a
--- /dev/null
+++ b/internal/fusefrontend_reverse/ctlsock_interface.go
@@ -0,0 +1,39 @@
+package fusefrontend_reverse
+
+import (
+	"path/filepath"
+	"strings"
+
+	"golang.org/x/sys/unix"
+
+	"github.com/rfjakob/gocryptfs/internal/ctlsocksrv"
+	"github.com/rfjakob/gocryptfs/internal/pathiv"
+)
+
+// Verify that the interface is implemented.
+var _ ctlsocksrv.Interface = &RootNode{}
+
+// EncryptPath implements ctlsock.Backend.
+// This is used for the control socket and for the "-exclude" logic.
+func (rn *RootNode) EncryptPath(plainPath string) (string, error) {
+	if rn.args.PlaintextNames || plainPath == "" {
+		return plainPath, nil
+	}
+	cipherPath := ""
+	parts := strings.Split(plainPath, "/")
+	for _, part := range parts {
+		dirIV := pathiv.Derive(cipherPath, pathiv.PurposeDirIV)
+		encryptedPart := rn.nameTransform.EncryptName(part, dirIV)
+		if rn.args.LongNames && len(encryptedPart) > unix.NAME_MAX {
+			encryptedPart = rn.nameTransform.HashLongName(encryptedPart)
+		}
+		cipherPath = filepath.Join(cipherPath, encryptedPart)
+	}
+	return cipherPath, nil
+}
+
+// DecryptPath implements ctlsock.Backend
+func (rn *RootNode) DecryptPath(cipherPath string) (string, error) {
+	p, err := rn.decryptPath(cipherPath)
+	return p, err
+}