From afa61d6e8d669b9586cbc747c65e57766a2a9ab7 Mon Sep 17 00:00:00 2001
From: sjlleo <shen_jia_le@qq.com>
Date: Fri, 13 May 2022 16:04:30 +0800
Subject: [PATCH] =?UTF-8?q?update:=20=E5=8F=AA=E8=A7=A3=E6=9E=90=E5=9F=9F?=
 =?UTF-8?q?=E5=90=8D=E4=B8=ADIPv4=20IP?=
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---
 util/util.go | 18 ++++++++++++++++--
 1 file changed, 16 insertions(+), 2 deletions(-)

diff --git a/util/util.go b/util/util.go
index daf3ee1..3c7dc6e 100644
--- a/util/util.go
+++ b/util/util.go
@@ -28,15 +28,29 @@ func LocalIPPort(dstip net.IP) (net.IP, int) {
 func DomainLookUp(host string) net.IP {
 	ips, err := net.LookupIP(host)
 	if err != nil {
-		fmt.Println("Domain" + host + "Lookup Fail.")
+		fmt.Println("Domain " + host + " Lookup Fail.")
 		os.Exit(1)
 	}
 
 	var ipSlice = []net.IP{}
+	var ipv6Flag = false
 
 	for _, ip := range ips {
-		ipSlice = append(ipSlice, ip)
+		// 仅返回ipv4的ip
+		if ip.To4() != nil {
+			ipSlice = append(ipSlice, ip)
+		} else {
+			ipv6Flag = true
+		}
 	}
+
+	if ipv6Flag {
+		fmt.Println("[Info] IPv6 Traceroute is not supported right now.")
+		if len(ipSlice) == 0 {
+			os.Exit(0)
+		}
+	}
+
 	if len(ipSlice) == 1 {
 		return ipSlice[0]
 	} else {