understand OTA bit

common/net/testing/assert/address.go

@@ -25,13 +25,7 @@ func (subject *AddressSubject) DisplayString() string {
 }
 
 func (subject *AddressSubject) Equals(another v2net.Address) {
-	if subject.value.IsIPv4() && another.IsIPv4() {
-		IP(subject.value.IP()).Equals(another.IP())
-	} else if subject.value.IsIPv6() && another.IsIPv6() {
-		IP(subject.value.IP()).Equals(another.IP())
-	} else if subject.value.IsDomain() && another.IsDomain() {
-		assert.StringLiteral(subject.value.Domain()).Equals(another.Domain())
-	} else {
+	if !subject.value.Equals(another) {
 		subject.Fail(subject.DisplayString(), "equals to", another)
 	}
 }

proxy/shadowsocks/protocol.go

@@ -18,6 +18,7 @@ const (
 type Request struct {
 	Address v2net.Address
 	Port    v2net.Port
+	OTA     bool
 }
 
 func ReadRequest(reader io.Reader) (*Request, error) {
@@ -32,7 +33,10 @@ func ReadRequest(reader io.Reader) (*Request, error) {
 
 	request := new(Request)
 
-	addrType := buffer.Value[0]
+	addrType := (buffer.Value[0] & 0x0F)
+	if (buffer.Value[0] & 0x10) == 0x10 {
+		request.OTA = true
+	}
 	switch addrType {
 	case AddrTypeIPv4:
 		_, err := io.ReadFull(reader, buffer.Value[:4])

proxy/shadowsocks/protocol_test.go

@@ -0,0 +1,37 @@
+package shadowsocks_test
+
+import (
+	"testing"
+
+	"github.com/v2ray/v2ray-core/common/alloc"
+	v2net "github.com/v2ray/v2ray-core/common/net"
+	netassert "github.com/v2ray/v2ray-core/common/net/testing/assert"
+	. "github.com/v2ray/v2ray-core/proxy/shadowsocks"
+	v2testing "github.com/v2ray/v2ray-core/testing"
+	"github.com/v2ray/v2ray-core/testing/assert"
+)
+
+func TestNormalRequestParsing(t *testing.T) {
+	v2testing.Current(t)
+
+	buffer := alloc.NewSmallBuffer().Clear()
+	buffer.AppendBytes(1, 127, 0, 0, 1, 0, 80)
+
+	request, err := ReadRequest(buffer)
+	assert.Error(err).IsNil()
+	netassert.Address(request.Address).Equals(v2net.IPAddress([]byte{127, 0, 0, 1}))
+	netassert.Port(request.Port).Equals(v2net.Port(80))
+	assert.Bool(request.OTA).IsFalse()
+}
+
+func TestOTARequest(t *testing.T) {
+	v2testing.Current(t)
+
+	buffer := alloc.NewSmallBuffer().Clear()
+	buffer.AppendBytes(0x13, 13, 119, 119, 119, 46, 118, 50, 114, 97, 121, 46, 99, 111, 109, 0, 0)
+
+	request, err := ReadRequest(buffer)
+	assert.Error(err).IsNil()
+	netassert.Address(request.Address).Equals(v2net.DomainAddress("www.v2ray.com"))
+	assert.Bool(request.OTA).IsTrue()
+}