From 9040b4c2842f880576312bc065c775c8f7dda7c4 Mon Sep 17 00:00:00 2001
From: dipingxian2 <39109351+dipingxian2@users.noreply.github.com>
Date: Sat, 26 Jan 2019 16:53:05 +0800
Subject: [PATCH] Update urlv4.go

Add "net.LookupIP()" function to support hostname when we add enode by hostname:port
---
 p2p/enode/urlv4.go | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/p2p/enode/urlv4.go b/p2p/enode/urlv4.go
index 50e9485d04..c155414d92 100644
--- a/p2p/enode/urlv4.go
+++ b/p2p/enode/urlv4.go
@@ -124,7 +124,13 @@ func parseComplete(rawurl string) (*Node, error) {
 		return nil, fmt.Errorf("invalid host: %v", err)
 	}
 	if ip = net.ParseIP(host); ip == nil {
-		return nil, errors.New("invalid IP address")
+		// attempt to look up IP addresses if host is a FQDN
+		lookupIPs, err := net.LookupIP(host)
+		if err != nil {
+			return nil, errors.New("invalid IP address")
+		}
+		// set to first ip by default
+		ip = lookupIPs[0]
 	}
 	// Ensure the IP is 4 bytes long for IPv4 addresses.
 	if ipv4 := ip.To4(); ipv4 != nil {