Add support for passive ICE TCP candidate

Closes #196

tcp_ip_mux_test.go

@@ -0,0 +1,58 @@
+package ice
+
+import (
+	"net"
+	"testing"
+
+	"github.com/pion/logging"
+	"github.com/pion/stun"
+	"github.com/pion/transport/test"
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+)
+
+func TestTCP_Recv(t *testing.T) {
+	report := test.CheckRoutines(t)
+	defer report()
+
+	loggerFactory := logging.NewDefaultLoggerFactory()
+
+	tim := newTCPIPMux(tcpIPMuxParams{
+		ListenPort:     8080,
+		Logger:         loggerFactory.NewLogger("ice"),
+		ReadBufferSize: 20,
+	})
+
+	tcpMux, err := tim.Listen(net.IP{127, 0, 0, 1})
+	require.NoError(t, err, "error starting listener")
+	defer func() {
+		_ = tcpMux.Close()
+	}()
+
+	require.NotNil(t, tcpMux.LocalAddr(), "tcpMux.LocalAddr() is nil")
+
+	conn, err := net.DialTCP("tcp", nil, tcpMux.LocalAddr().(*net.TCPAddr))
+	require.NoError(t, err, "error dialing test tcp connection")
+
+	msg := stun.New()
+	msg.Type = stun.MessageType{Method: stun.MethodBinding, Class: stun.ClassRequest}
+	msg.Add(stun.AttrUsername, []byte("myufrag:otherufrag"))
+	msg.Add(stun.AttrICEControlling, nil)
+	msg.Encode()
+
+	n, err := writeStreamingPacket(conn, msg.Raw)
+	require.NoError(t, err, "error writing tcp stun packet")
+
+	pktConn, err := tcpMux.GetConn("myufrag")
+	require.NoError(t, err, "error retrieving muxed connection for ufrag")
+	defer func() {
+		_ = pktConn.Close()
+	}()
+
+	recv := make([]byte, n)
+	n2, raddr, err := pktConn.ReadFrom(recv)
+	require.NoError(t, err, "error receiving data")
+	assert.Equal(t, conn.LocalAddr(), raddr, "remote tcp address mismatch")
+	assert.Equal(t, n, n2, "received byte size mismatch")
+	assert.Equal(t, msg.Raw, recv, "received bytes mismatch")
+}