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// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// Package nettype defines an interface that doesn't exist in the Go net package.
package nettype
import (
"context"
"net"
"net/netip"
)
// PacketListener defines the ListenPacket method as implemented
// by net.ListenConfig, net.ListenPacket, and tstest/natlab.
type PacketListener interface {
ListenPacket(ctx context.Context, network, address string) (net.PacketConn, error)
}
type PacketListenerWithNetIP interface {
ListenPacket(ctx context.Context, network, address string) (PacketConn, error)
}
// Std implements PacketListener using the Go net package's ListenPacket func.
type Std struct{}
func (Std) ListenPacket(ctx context.Context, network, address string) (net.PacketConn, error) {
var conf net.ListenConfig
return conf.ListenPacket(ctx, network, address)
}
type PacketConn interface {
net.PacketConn
WriteToUDPAddrPort([]byte, netip.AddrPort) (int, error)
}
func MakePacketListenerWithNetIP(ln PacketListener) PacketListenerWithNetIP {
return packetListenerAdapter{ln}
}
type packetListenerAdapter struct {
PacketListener
}
func (a packetListenerAdapter) ListenPacket(ctx context.Context, network, address string) (PacketConn, error) {
pc, err := a.PacketListener.ListenPacket(ctx, network, address)
if err != nil {
return nil, err
}
return pc.(PacketConn), nil
}
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