From af4bed9262b10316067b7528cab888623cddf52f Mon Sep 17 00:00:00 2001
From: Miroslav Lichvar <mlichvar0@gmail.com>
Date: Fri, 6 Apr 2018 08:29:30 +0200
Subject: [PATCH] don't respond to NTPv0 packets

---
 src/main.rs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/main.rs b/src/main.rs
index dcf2508..892bcd3 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -136,7 +136,7 @@ impl NtpPacket {
         let version = (buf[0] >> 3) & 0x7;
         let mode = buf[0] & 0x7;
 
-        if version > 4 {
+        if version < 1 || version > 4 {
             return Err(Error::new(ErrorKind::Other, "Unsupported version"));
         }