Remoting獲取客戶端外網IP

     領導又有了新的要求，在用戶登錄的時候記錄用戶的IP地址和機器名。

     在C#中，獲取本機的機器名和IP地址，甚至網卡的MAC地址，都是很簡單的事情，有封裝好的類和方法可以使用，但現在遇到的問題是，如果客戶端的機器是在另一個局域網內，那網卡的IP地址是局域網地址，這對我們來說沒有用，這就要記錄外網的IP，但是Remoting沒有現成的方法來獲取客戶端的IP，google了一下，網上比較多的是采用在Server端注冊自定義Server Channel Sink，通過Transport Headers來獲取Request的IP。于是我就用了別人寫好的現成的Sink，以及學習了Rickie的一篇《如何定制Sink擴展.Net Remoting功能》。
     Rickie的文章：http://www.cnblogs.com/rickie/archive/2004/10/21/54891.html
     自定義的Sink的類：http://blog.joycode.com/tingwang/articles/39610.aspx

 

 

public   class  ClientIPServerSinkProvider : IServerChannelSinkProvider
     {
        private IServerChannelSinkProvider next = null;

        public ClientIPServerSinkProvider()
        {
        }

        public ClientIPServerSinkProvider(IDictionary properties, ICollection providerData)
        {
        }

        public void GetChannelData(IChannelDataStore channelData)
        {
        }

        public IServerChannelSink CreateSink(IChannelReceiver channel)
        {
            IServerChannelSink nextSink = null;
            if (next != null)
            {
                nextSink = next.CreateSink(channel);
            }

            return new ClientIPServerSink(nextSink);
        }

        public IServerChannelSinkProvider Next
        {
            get { return next; }
            set { next = value; }
        }
    }

     public   class  ClientIPServerSink : BaseChannelObjectWithProperties, IServerChannelSink, IChannelSinkBase
     {

        private IServerChannelSink _next;

        public ClientIPServerSink(IServerChannelSink next)
        {
            _next = next;
        }

        public void AsyncProcessResponse(IServerResponseChannelSinkStack sinkStack, Object state, IMessage msg, ITransportHeaders headers, Stream stream)
        {
        }

        public Stream GetResponseStream(IServerResponseChannelSinkStack sinkStack, Object state, IMessage msg, ITransportHeaders headers)
        {
            return null;
        }

        public System.Runtime.Remoting.Channels.ServerProcessing ProcessMessage(IServerChannelSinkStack sinkStack, IMessage requestMsg, ITransportHeaders requestHeaders, Stream requestStream, out IMessage responseMsg, out ITransportHeaders responseHeaders, out Stream responseStream)
        {
            if (_next != null)
            {
                IPAddress ip = requestHeaders[CommonTransportKeys.IPAddress] as IPAddress;
                Console.WriteLine(ip.ToString());
                CallContext.SetData("ClientIPAddress", ip);
                ServerProcessing spres = _next.ProcessMessage(sinkStack, requestMsg, requestHeaders, requestStream, out responseMsg, out responseHeaders, out responseStream);

                return spres;
            }
            else
            {
                responseMsg = null;
                responseHeaders = null;
                responseStream = null;

                return new ServerProcessing();
            }
        }

        public IServerChannelSink NextChannelSink
        {
            get { return _next; }
            set { _next = value; }
        }
    }

 

     在Remoting的服務端加入了這個類后，由于我是在IIS上承載的Remoting，所以就需要修改Web.config文件來啟用這個Sink。

 

 

       < channels >
         < channel port = " 8000 "   ref = " http "  name  = " httpServer " >
           < serverProviders >
             < formatter  ref = " soap "  typeFilterLevel = " Full " />
             < formatter  ref = " binary "  typeFilterLevel = " Full " />
             < provider type = " Galaxy.Server.Remoting.ClientIPServerSinkProvider, Galaxy.Server.Remoting "   />
           </ serverProviders >
         </ channel >
         < channel port = " 9000 "   ref = " tcp "  name  = " tcpServer " >
           < serverProviders >
             < formatter  ref = " soap "  typeFilterLevel = " Full " />
             < formatter  ref = " binary "  typeFilterLevel = " Full " />
             < provider type = " Galaxy.Server.Remoting.ClientIPServerSinkProvider, Galaxy.Server.Remoting "   />
           </ serverProviders >
         </ channel >
       </ channels >

 

     做完這個后，以后只需在服務器端通過 ((System.Net.IPAddress)System.Runtime.Remoting.Messaging.CallContext.GetData("ClientIPAddress")).ToString() 就可以獲取Request的IP了。