From 0f94ceec752592e4ac632a24e3c64a97dd09bf4c Mon Sep 17 00:00:00 2001
From: 5eraph <5eraph@protonmail.com>
Date: Mon, 23 Mar 2020 20:11:58 +0100
Subject: limit vnameserver_addr to port 53

Fixes #16

Signed-off-by: 5eraph <5eraph@protonmail.com>
---
 src/socket.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/socket.c b/src/socket.c
index 656c319..cd2f89e 100644
--- a/src/socket.c
+++ b/src/socket.c
@@ -822,7 +822,7 @@ void sofwdrain(struct socket *so)
 static bool sotranslate_out4(Slirp *s, struct socket *so, struct sockaddr_in *sin)
 {
     if (!s->disable_dns && so->so_faddr.s_addr == s->vnameserver_addr.s_addr) {
-        return get_dns_addr(&sin->sin_addr) >= 0;
+        return so->so_fport == htons(53) && get_dns_addr(&sin->sin_addr) >= 0;
     }
 
     if (so->so_faddr.s_addr == s->vhost_addr.s_addr ||
@@ -841,7 +841,7 @@ static bool sotranslate_out6(Slirp *s, struct socket *so, struct sockaddr_in6 *s
 {
     if (!s->disable_dns && in6_equal(&so->so_faddr6, &s->vnameserver_addr6)) {
         uint32_t scope_id;
-        if (get_dns6_addr(&sin->sin6_addr, &scope_id) >= 0) {
+        if (so->so_fport == htons(53) && get_dns6_addr(&sin->sin6_addr, &scope_id) >= 0) {
             sin->sin6_scope_id = scope_id;
             return true;
         }
-- 
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