Telnet获取空输出并且没有登录/密码

我尝试编写Swift片段来向Telnet发送命令，但我需要先登录 .

在OSX上，我生成了一个Telnet服务： launchctl load -F /System/Library/LaunchDaemons/telnet.plist . 之后我能够从其他计算机连接到IP： XXX.XXX.X.XXX port 23 .

例如，从Windows 7：

telnet XXX.XXX.X.XXX 23
.....
Darwin/BSD (fess.local) (ttys009)

login: snaggs
Password:xxxxxx

snaggs:~ lur$

在命令行中，Telnet要求我输入用户名和密码 . 之后我可以运行任何Linux命令 . 到现在为止还挺好 .

我为 Android 编写了Telnet模块，因此OSX Telnet服务正常工作 . 这意味着我看到 login: 和 password: 输出，所以我能够处理它 .

现在我坚持使用iOS Swift，我用Google搜索并找到了非常好的解决方案，应该适用于我的情况：

• receiving-data-from-nsinputstream-in-swift

• using-sockets-in-swift-like-in-java

所以我写了我的家庭作品：

class TelnetClient : NSObject, NSStreamDelegate{

    private var inputStream: NSInputStream!
    private var outputStream: NSOutputStream!


func initNetworkCommunication(){
        let host : CFString = "XXX.XXX.X.XXX"
        let port : UInt32 = 23
        var readstream : Unmanaged<CFReadStream>?
        var writestream : Unmanaged<CFWriteStream>?

        CFStreamCreatePairWithSocketToHost(kCFAllocatorDefault, host, port, &readstream, &writestream)

 //        var _inputStream: NSInputStream? 
 //        var _outputStream: NSOutputStream? 
 //        NSStream.getStreamsToHostWithName("XXX.XXX.X.XXX", port: 23, inputStream: &_inputStream, outputStream: &_outputStream) 
 //        self.inputStream = _inputStream! 
 //        self.outputStream = _outputStream!


        self.inputStream = readstream!.takeRetainedValue()
        self.outputStream = writestream!.takeRetainedValue()

        self.inputStream.delegate = self
        self.outputStream.delegate = self


        self.inputStream.scheduleInRunLoop(NSRunLoop.currentRunLoop(), forMode: NSDefaultRunLoopMode)
        self.outputStream.scheduleInRunLoop(NSRunLoop.currentRunLoop(), forMode: NSDefaultRunLoopMode)

        self.inputStream.open()
        self.outputStream.open()

    }


func sendMessage(message:String){

    let data: NSData = message.dataUsingEncoding(NSASCIIStringEncoding, allowLossyConversion: true)! //NSUTF8StringEncoding
    let stream: NSInputStream = NSInputStream(data: data)

        var buffer = [UInt8](count: 8, repeatedValue: 0)
        stream.open()

        if stream.hasBytesAvailable {
          let result :Int = stream.read(&buffer, maxLength: buffer.count)
        }
        self.outputStream.write(&buffer, maxLength: buffer.count)

        println("wrote to Server: \(message)")
    }

}

来自 NSStreamDelegate 的流回调覆盖方法：

func stream(aStream: NSStream, handleEvent eventCode: NSStreamEvent) {
        switch (eventCode){
        case NSStreamEvent.ErrorOccurred:
            NSLog("ErrorOccurred")
            break
        case NSStreamEvent.EndEncountered:
            NSLog("EndEncountered")
            break
        case NSStreamEvent.None:
            NSLog("None")
            break
        case NSStreamEvent.HasBytesAvailable:
            NSLog("HasBytesAvaible")
            // ... NEVER ENTERS HERE
            var buffer = [UInt8](count: 4096, repeatedValue: 0)
        if ( aStream == self.inputStream){

            while (self.inputStream.hasBytesAvailable){
                var len = self.inputStream.read(&buffer, maxLength: buffer.count)
                if(len > 0){
                    var output = NSString(bytes: &buffer, length: buffer.count, encoding: NSUTF8StringEncoding)
                    if (output != ""){
                        NSLog("server said: %@", output!)
                    }
                }
            }
        }
            break
        //case NSStreamEvent.allZeros:
        //    NSLog("allZeros")
        //     break
        case NSStreamEvent.OpenCompleted:
            NSLog("OpenCompleted") // <-- called on initialisation
            break
        case NSStreamEvent.HasSpaceAvailable:
            NSLog("HasSpaceAvailable")
            break
        default:
             NSLog("default")
             break

        }
    }

首先，当我尝试调用 initNetworkCommunication() 时没有任何反应 . 我希望调用 func stream or I'm wrong? . 它应该是 NSStreamEvent.HasBytesAvailable state or I'm wrong?

当我调用 sendMessage("snags") 时，我在 stream 得到的响应落在 case NSStreamEvent.HasSpaceAvailable 上 . What does it mean?

My expected results: 关于连接我应该得到 login: 输出但什么也得不到 .