Question

我正在努力自学Go。我写了一个简单的客户端/服务器应用程序，它有一些加密和非常简单的数据包结构。

我有一个go例程用于监听，然后将数据发送到每个连接的客户端。在我向每个客户端发送数据的函数中，我将消息附加到标题但是它做了一些奇怪的行为。

func ClientSender(client *Client) {
for {
    input := <-client.Outgoing                             //TODO add cleanup quit bool
    for _, clientz := range RoomList[client.Room].Clients { //TODO rename to client connections = ClientList
        temp := input
        dbgMsg.Printf("RAW SENDER: % x", input)
        dbgMsg.Printf("INPUT END1: % x", input)
        dbgMsg.Printf("AES KEY % x\n", clientz.AES_Key)
        dbgMsg.Printf("INPUT END2: % x", input)
        dbgMsg.Printf("pre ecnryp: % x\n", input[30:])
        dbgMsg.Printf("INPUT END3: % x", input)
        encPayload := input[30:]
        dbgMsg.Printf("INPUT END4: % x", input)
        header := input[:30]
        dbgMsg.Printf("INPUT END5: % x", input)
        e,_ := barrenoid.Encrypt(clientz.AES_Key, encPayload)
        dbgMsg.Printf("INPUT END6: % x", input)
        dbgMsg.Printf("header: % x\n", input[:30])
        dbgMsg.Printf("payload: % x\n", input[30:])
        dbgMsg.Printf("encrypt: % x\n", e)
        dbgMsg.Printf("TEMP: % x\n", temp)
        asdf := append(header, e...)
        dbgMsg.Printf("SENDING: % x", asdf)
        //_, err := clientz.Conn.Write(payload)
        //chkError(err)
        input = temp
        dbgMsg.Printf("INPUT END7: % x", input)
    }
}
}

“输入”的值变了，我无法弄清楚原因。这是上面代码的输出：

INFO:   2016/02/22 10:47:38 RAW SENDER: 0d ae 00 00 00 00 56 cb 57 ca 41 6e 6f 6e 79 6d 6f 75 73 00 00 00 00 00 00 00 00 00 00 00 0a

INFO:   2016/02/22 10:47:38 INPUT END1: 0d ae 00 00 00 00 56 cb 57 ca 41 6e 6f 6e 79 6d 6f 75 73 00 00 00 00 00 00 00 00 00 00 00 0a
INFO:   2016/02/22 10:47:38 AES KEY 06 89 c9 d7 ad ec 4a d0 33 bf fa ab 6e 05 cd 51 87 8b f0 ad 60 a8 36 47 ca 8f 7a f8 b8 6f 1c ce
INFO:   2016/02/22 10:47:38 INPUT END2: 0d ae 00 00 00 00 56 cb 57 ca 41 6e 6f 6e 79 6d 6f 75 73 00 00 00 00 00 00 00 00 00 00 00 0a
INFO:   2016/02/22 10:47:38 pre ecnryp: 0a
INFO:   2016/02/22 10:47:38 INPUT END3: 0d ae 00 00 00 00 56 cb 57 ca 41 6e 6f 6e 79 6d 6f 75 73 00 00 00 00 00 00 00 00 00 00 00 0a
INFO:   2016/02/22 10:47:38 INPUT END4: 0d ae 00 00 00 00 56 cb 57 ca 41 6e 6f 6e 79 6d 6f 75 73 00 00 00 00 00 00 00 00 00 00 00 0a
INFO:   2016/02/22 10:47:38 INPUT END5: 0d ae 00 00 00 00 56 cb 57 ca 41 6e 6f 6e 79 6d 6f 75 73 00 00 00 00 00 00 00 00 00 00 00 0a
INFO:   2016/02/22 10:47:38 INPUT END6: 0d ae 00 00 00 00 56 cb 57 ca 41 6e 6f 6e 79 6d 6f 75 73 00 00 00 00 00 00 00 00 00 00 00 0a
INFO:   2016/02/22 10:47:38 header: 0d ae 00 00 00 00 56 cb 57 ca 41 6e 6f 6e 79 6d 6f 75 73 00 00 00 00 00 00 00 00 00 00 00
INFO:   2016/02/22 10:47:38 payload: 0a
INFO:   2016/02/22 10:47:38 encrypt: ***c8*** 7e ff f9 f5 c3 ce 1e 1d 44 91 b7 fb 09 5d e0 7e
INFO:   2016/02/22 10:47:38 TEMP: 0d ae 00 00 00 00 56 cb 57 ca 41 6e 6f 6e 79 6d 6f 75 73 00 00 00 00 00 00 00 00 00 00 00 0a
INFO:   2016/02/22 10:47:38 SENDING: 0d ae 00 00 00 00 56 cb 57 ca 41 6e 6f 6e 79 6d 6f 75 73 00 00 00 00 00 00 00 00 00 00 00 c8 7e ff f9 f5 c3 ce 1e 1d 44 91 b7 fb 09 5d e0 7e
INFO:   2016/02/22 10:47:38 INPUT END7: 0d ae 00 00 00 00 56 cb 57 ca 41 6e 6f 6e 79 6d 6f 75 73 00 00 00 00 00 00 00 00 00 00 00 ***c8***

我无法弄清楚为什么包含“INPUT END7”的行不等于“输入”值。

最后一个字节总是等于“加密”输出中的第一个字节...

以下是将切片发送到频道的代码：

func ClientReader(client *Client) {
//Main Read loop
for {
    bytesRead, buffer := client.Read()

    if bytesRead < HEADERSIZE {
        //client.Outgoing <- protocolPacker(0x0D, 0xAE, []byte(""), []byte("Minimum header not recieved."))
        client.Close()
        break // Connection to host is broken
    }

    //dbgMsg.Printf("RAW RECIEVED % x", buffer)
    cmdBit, encryptionByte, ts, payload := protocolParser(buffer)
    dbgMsg.Printf("CMDBIT: % x, ENCBIT: % x, TS: % d, PAYLOAD: % x", cmdBit, encryptionByte, ts, payload)


    if encryptionByte == 0xAE {
        payload, _ = barrenoid.Decrypt(client.AES_Key, payload)
        dbgMsg.Printf("Decrypted payload % x\n", payload)
    } else if encryptionByte == 0x00 {
        // no need to decrypt
    } else {
        //bad packet reject
    }

    if cmdBit == 0x0D{
        //payload, _ = barrenoid.Encrypt(client.AES_Key, payload)
        client.Outgoing <- protocolPacker(0x0D, 0xAE, []byte(client.Name), payload)
    } else if cmdBit == 0x1C {
        client.Name = string(payload)
    } else {
        //bad packet reject
        //client.Outgoing <- protocolPacker(0x0D, 0xAE, []byte(client.Name), []byte("Unknown command bit."))
    }
}

Answer 1

切片temp和input共享相同的支持数组。通过一个切片的修改通过另一个切片可见。包含“INPUT END7”的行与“INPUT END1”的行不同，因为切片的后备数组在此行上被修改：

asdf := append(header, e...)

您可以使用以下代码行复制支持数组：

temp := append([]byte(nil), input...)

在常规

1 个答案: