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// SPDX-FileCopyrightText: 2023 The Pion community <https://pion.ly>
// SPDX-License-Identifier: MIT
// Package stuntest contains helpers for testing STUN clients
package stuntest
import (
"errors"
"fmt"
"net"
"testing"
)
var errUDPServerUnsupportedNetwork = errors.New("unsupported network")
// NewUDPServer creates an udp server for testing. The supplied handler function will be called with the request
// and should be used to emulate the server behavior.
func NewUDPServer(
t *testing.T,
network string,
maxMessageSize int,
handler func(req []byte) ([]byte, error),
) (net.Addr, func(t *testing.T), error) {
var ip string
switch network {
case "udp4":
ip = "127.0.0.1"
case "udp6":
ip = "[::1]"
default:
return nil, nil, fmt.Errorf("%w: %s", errUDPServerUnsupportedNetwork, network)
}
udpConn, err := net.ListenUDP(network, &net.UDPAddr{IP: net.ParseIP(ip), Port: 0})
if err != nil {
t.Fatal(err) //nolint:forbidigo
}
// Necessary for IPv6
address := fmt.Sprintf("%s:%d", ip, udpConn.LocalAddr().(*net.UDPAddr).Port) //nolint:forcetypeassert
serverAddr, err := net.ResolveUDPAddr(network, address)
if err != nil {
return nil, nil, fmt.Errorf("failed to resolve stun host: %s: %w", address, err)
}
errCh := make(chan error, 1)
go func() {
for {
bs := make([]byte, maxMessageSize)
n, addr, err := udpConn.ReadFrom(bs)
if err != nil {
errCh <- err
return
}
resp, err := handler(bs[:n])
if err != nil {
errCh <- err
return
}
_, err = udpConn.WriteTo(resp, addr)
if err != nil {
errCh <- err
return
}
}
}()
return serverAddr, func(t *testing.T) {
select {
case err := <-errCh:
if err != nil {
t.Fatal(err) //nolint
return
}
default:
}
err := udpConn.Close()
if err != nil {
t.Fatal(err) //nolint
}
<-errCh
}, nil
}
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