commands/dns: return NotFound error for failed resolutions

License: MIT
Signed-off-by: Lars Gierth <larsg@systemli.org>

commands/response.go

@@ -17,6 +17,7 @@ type ErrorType uint
 const (
 	ErrNormal         ErrorType = iota // general errors
 	ErrClient                          // error was caused by the client, (e.g. invalid CLI usage)
+	ErrNotFound                        // == HTTP 404 Not Found
 	ErrImplementation                  // programmer error in the server
 	// TODO: add more types of errors for better error-specific handling
 )

core/commands/dns.go

@@ -60,6 +60,10 @@ The resolver can recursively resolve:
 			depth = namesys.DefaultDepthLimit
 		}
 		output, err := resolver.ResolveN(req.Context(), name, depth)
+		if err == namesys.ErrResolveFailed {
+			res.SetError(err, cmds.ErrNotFound)
+			return
+		}
 		if err != nil {
 			res.SetError(err, cmds.ErrNormal)
 			return