protocol: prove erroneous timeout after timeout is set

As reported in #75

Signed-off-by: Pires <pjpires@gmail.com>

protocol_test.go

@@ -9,10 +9,12 @@ import (
 	"context"
 	"crypto/tls"
 	"crypto/x509"
+	"errors"
 	"fmt"
 	"io"
 	"io/ioutil"
 	"net"
+	"os"
 	"testing"
 	"time"
 )
@@ -29,7 +31,7 @@ func TestPassthrough(t *testing.T) {
 		conn, err := net.Dial("tcp", pl.Addr().String())
 		if err != nil {
 			t.Fatalf("err: %v", err)
-		}
+			}
 		defer conn.Close()
 
 		conn.Write([]byte("ping"))
@@ -71,7 +73,7 @@ func TestReadHeaderTimeout(t *testing.T) {
 
 	pl := &Listener{
 		Listener:          l,
-		ReadHeaderTimeout: 1 * time.Millisecond,
+		ReadHeaderTimeout: time.Millisecond * 250,
 	}
 
 	ctx, cancel := context.WithCancel(context.Background())
@@ -97,6 +99,93 @@ func TestReadHeaderTimeout(t *testing.T) {
 	recv := make([]byte, 4)
 	_, err = conn.Read(recv)
 
+	if err != nil && !errors.Is(err, os.ErrDeadlineExceeded){
+		t.Fatal("should timeout")
+	}
+}
+
+func TestReadHeaderTimeoutIsReset(t *testing.T) {
+	const timeout = time.Millisecond * 250
+
+	l, err := net.Listen("tcp", "127.0.0.1:0")
+	if err != nil {
+		t.Fatalf("err: %v", err)
+	}
+
+	pl := &Listener{
+		Listener: l,
+		ReadHeaderTimeout: timeout,
+	}
+
+	header := &Header{
+		Version:           2,
+		Command:           PROXY,
+		TransportProtocol: TCPv4,
+		SourceAddr: &net.TCPAddr{
+			IP:   net.ParseIP("10.1.1.1"),
+			Port: 1000,
+		},
+		DestinationAddr: &net.TCPAddr{
+			IP:   net.ParseIP("20.2.2.2"),
+			Port: 2000,
+		},
+	}
+	go func() {
+		conn, err := net.Dial("tcp", pl.Addr().String())
+		if err != nil {
+			t.Fatalf("err: %v", err)
+		}
+		defer conn.Close()
+
+		// Write out the header!
+		header.WriteTo(conn)
+
+		// Sleep here longer than the configured timeout.
+		time.Sleep(timeout * 2)
+
+		conn.Write([]byte("ping"))
+		recv := make([]byte, 4)
+		_, err = conn.Read(recv)
+		if err != nil {
+			t.Fatalf("err: %v", err)
+		}
+		if !bytes.Equal(recv, []byte("pong")) {
+			t.Fatalf("bad: %v", recv)
+		}
+	}()
+
+	conn, err := pl.Accept()
+	if err != nil {
+		t.Fatalf("err: %v", err)
+	}
+	defer conn.Close()
+
+	recv := make([]byte, 4)
+	_, err = conn.Read(recv)
+	if err != nil {
+		t.Fatalf("err: %v", err)
+	}
+	if !bytes.Equal(recv, []byte("ping")) {
+		t.Fatalf("bad: %v", recv)
+	}
+
+	if _, err := conn.Write([]byte("pong")); err != nil {
+		t.Fatalf("err: %v", err)
+	}
+
+	// Check the remote addr
+	addr := conn.RemoteAddr().(*net.TCPAddr)
+	if addr.IP.String() != "10.1.1.1" {
+		t.Fatalf("bad: %v", addr)
+	}
+	if addr.Port != 1000 {
+		t.Fatalf("bad: %v", addr)
+	}
+
+	h := conn.(*Conn).ProxyHeader()
+	if !h.EqualsTo(header) {
+		t.Errorf("bad: %v", h)
+	}
 }
 
 func TestParse_ipv4(t *testing.T) {