Properly compute the padding length for local DoH

jedisct1 · jedisct1 · commit cf1498c9f4ce · 2020-01-31T10:58:03.000+01:00
Fixes #1173
diff --git a/dnscrypt-proxy/local-doh.go b/dnscrypt-proxy/local-doh.go
@@ -59,7 +59,7 @@ func (handler localDoHHandler) ServeHTTP(writer http.ResponseWriter, request *ht
 	}
 	responseLen := len(response)
 	paddedLen := dohPaddedLen(responseLen)
-	padLen := responseLen - paddedLen
+	padLen := paddedLen - responseLen
 	paddedResponse, err := addEDNS0PaddingIfNoneFound(&msg, response, padLen)
 	if err != nil {
 		return

Original file line number	Diff line number	Diff line change
`@@ -59,7 +59,7 @@ func (handler localDoHHandler) ServeHTTP(writer http.ResponseWriter, request *ht`
`59`	`59`	`}`
`60`	`60`	`responseLen := len(response)`
`61`	`61`	`paddedLen := dohPaddedLen(responseLen)`
`62`		`- padLen := responseLen - paddedLen`
	`62`	`+ padLen := paddedLen - responseLen`
`63`	`63`	`paddedResponse, err := addEDNS0PaddingIfNoneFound(&msg, response, padLen)`
`64`	`64`	`if err != nil {`
`65`	`65`	`return`