From 822f5a6d70c22df93ed1680fbe14ef3733647e89 Mon Sep 17 00:00:00 2001
From: Josh Bleecher Snyder <josharian@gmail.com>
Date: Mon, 29 Mar 2021 13:11:11 -0700
Subject: [PATCH] conn: unify code in StdNetBind.Send

The sending code is identical for ipv4 and ipv6;
select the conn, then use it.

Signed-off-by: Josh Bleecher Snyder <josharian@gmail.com>
---
 conn/bind_std.go | 27 +++++++++++++--------------
 1 file changed, 13 insertions(+), 14 deletions(-)

diff --git a/conn/bind_std.go b/conn/bind_std.go
index 28d1464..73946b4 100644
--- a/conn/bind_std.go
+++ b/conn/bind_std.go
@@ -161,22 +161,21 @@ func (bind *StdNetBind) Send(buff []byte, endpoint Endpoint) error {
 	if !ok {
 		return ErrWrongEndpointType
 	}
+	var conn *net.UDPConn
+	var blackhole bool
 	if nend.IP.To4() != nil {
-		if bind.ipv4 == nil {
-			return syscall.EAFNOSUPPORT
-		}
-		if bind.blackhole4 {
-			return nil
-		}
-		_, err = bind.ipv4.WriteToUDP(buff, (*net.UDPAddr)(nend))
+		blackhole = bind.blackhole4
+		conn = bind.ipv4
 	} else {
-		if bind.ipv6 == nil {
-			return syscall.EAFNOSUPPORT
-		}
-		if bind.blackhole6 {
-			return nil
-		}
-		_, err = bind.ipv6.WriteToUDP(buff, (*net.UDPAddr)(nend))
+		blackhole = bind.blackhole6
+		conn = bind.ipv6
 	}
+	if blackhole {
+		return nil
+	}
+	if conn == nil {
+		return syscall.EAFNOSUPPORT
+	}
+	_, err = conn.WriteToUDP(buff, (*net.UDPAddr)(nend))
 	return err
 }