我可以用OkHttp将本地IP地址绑定到SSLSocketFactory吗？

Question

我正在努力让Android上的OkHttpClient使用自定义证书发出HTTPS请求，同时绑定到特定网络接口的本地地址。我当前的尝试使用以下OkHttpClient：

val client = OkHttpClient.Builder()
        .readTimeout(2, TimeUnit.SECONDS)
        .connectTimeout(2, TimeUnit.SECONDS)
        .sslSocketFactory(
            MySocketFactory(
                getSslContext().socketFactory,
                localAddress
            ),
            MyTrustManager()
        )
        .build()

MySocketFactory类实现为：

class MySocketFactory(
    private val delegate: SSLSocketFactory, 
    private val localAddress: InetAddress
) : SSLSocketFactory() {
    override fun createSocket(): Socket {
        Timber.i("createSocket has been called!")
        val socket = delegate.createSocket()
        socket.bind(InetSocketAddress(localAddress, 0))
        return socket
    }

[other overrides of the various abstract createSocket methods, each of which throws an UnsupportedOperationException]

    override fun getDefaultCipherSuites() = delegate.defaultCipherSuites

    override fun getSupportedCipherSuites() = delegate.supportedCipherSuites
}

这主要是基于OkHttp GitHub站点的留档，它描述了如何将值传递给Builder.socketFactory（）允许我们通过覆盖无参数的createSocket方法将每个套接字绑定到特定地址。但是，sslSocketFactory的文档没有提到任何关于能够绑定套接字的内容。当我使用上述代码运行我的应用程序时，永远不会生成createSocket日志条目，这表明工厂被完全忽略。因此，永远不会到达HTTPendpoint。

如果我在没有包装器< code>MySocketFactory类的情况下尝试相同的设置，而只是传递< code>getSslContext()。socketFactory直接放入< code > builder . sslsocketfactory -然后我就可以很好地联系endpoint了，假设当时我的机器上只有一个本地地址。

所以我的问题是:这可以用自定义的< code>SSLSocketFactory来实现吗？

Answer 1

https://github.com/yschimke/okurl/blob/0abaa8510dd5466d5e9a08ebe33a009c491749bf/src/main/kotlin/com/baulsupp/okurl/network/InterfaceSocketFactory.kt

请使用< code > builder . socket factory(getsocket factory())。此示例代码应该基于IP或名称进行选择。

class InterfaceSocketFactory(private val localAddress: InetAddress) : SocketFactory() {
  private val systemFactory = getDefault()

  override fun createSocket(): Socket {
    val s = systemFactory.createSocket()
    s.bind(InetSocketAddress(localAddress, 0))
    return s
  }

  override fun createSocket(host: String, port: Int): Socket {
    return systemFactory.createSocket(host, port, localAddress, 0)
  }

  override fun createSocket(address: InetAddress, port: Int): Socket {
    return systemFactory.createSocket(address, port, localAddress, 0)
  }

  override fun createSocket(
    host: String,
    port: Int,
    localAddr: InetAddress,
    localPort: Int
  ): Socket {
    return systemFactory.createSocket(host, port, localAddr, localPort)
  }

  override fun createSocket(
    address: InetAddress,
    port: Int,
    localAddr: InetAddress,
    localPort: Int
  ): Socket {
    return systemFactory.createSocket(address, port, localAddr, localPort)
  }

  companion object {

    fun byName(ipOrInterface: String): SocketFactory? {
      val localAddress = try {
        // example 192.168.0.51
        InetAddress.getByName(ipOrInterface)
      } catch (uhe: UnknownHostException) {
        // example en0
        val networkInterface = NetworkInterface.getByName(ipOrInterface) ?: return null

        networkInterface.inetAddresses.nextElement()
      }

      return InterfaceSocketFactory(localAddress)
    }
  }
}

Answer 2

对但不是定制SSLSocketFactory，而是定制常规的SocketFactory。当OkHttp创建任何套接字时，它总是首先使用常规的SocketFactory，然后可能用SSL包装它。这对于TLS隧道是必要的，但在任何地方都可以使用。