From 21b3f66b8b97f13985a2a2eaa05947df35b67186 Mon Sep 17 00:00:00 2001
From: Darien Raymond <admin@v2ray.com>
Date: Thu, 6 Dec 2018 20:11:45 +0100
Subject: [PATCH] fix IP parsing in local dns client

---
 features/dns/localdns/client.go | 27 ++++++++++++++++++---------
 1 file changed, 18 insertions(+), 9 deletions(-)

diff --git a/features/dns/localdns/client.go b/features/dns/localdns/client.go
index fcd955bb2..143d9297e 100644
--- a/features/dns/localdns/client.go
+++ b/features/dns/localdns/client.go
@@ -21,7 +21,18 @@ func (*Client) Close() error { return nil }
 
 // LookupIP implements Client.
 func (*Client) LookupIP(host string) ([]net.IP, error) {
-	return net.LookupIP(host)
+	ips, err := net.LookupIP(host)
+	if err != nil {
+		return nil, err
+	}
+	parsedIPs := make([]net.IP, 0, len(ips))
+	for _, ip := range parsedIPs {
+		parsed := net.IPAddress(ip)
+		if parsed != nil {
+			parsedIPs = append(parsedIPs, parsed.IP())
+		}
+	}
+	return parsedIPs, nil
 }
 
 // LookupIPv4 implements IPv4Lookup.
@@ -30,11 +41,10 @@ func (c *Client) LookupIPv4(host string) ([]net.IP, error) {
 	if err != nil {
 		return nil, err
 	}
-	var ipv4 []net.IP
+	ipv4 := make([]net.IP, 0, len(ips))
 	for _, ip := range ips {
-		parsed := net.IPAddress(ip)
-		if parsed.Family().IsIPv4() {
-			ipv4 = append(ipv4, parsed.IP())
+		if len(ip) == net.IPv4len {
+			ipv4 = append(ipv4, ip)
 		}
 	}
 	return ipv4, nil
@@ -46,11 +56,10 @@ func (c *Client) LookupIPv6(host string) ([]net.IP, error) {
 	if err != nil {
 		return nil, err
 	}
-	var ipv6 []net.IP
+	ipv6 := make([]net.IP, 0, len(ips))
 	for _, ip := range ips {
-		parsed := net.IPAddress(ip)
-		if parsed.Family().IsIPv6() {
-			ipv6 = append(ipv6, parsed.IP())
+		if len(ip) == net.IPv6len {
+			ipv6 = append(ipv6, ip)
 		}
 	}
 	return ipv6, nil