go语言编写socks5代理服务器中遇到的问题

写好了不能用，好像是无法传输数据

#客户端

local.go:

''' package main

import (
    "EncryptionAndDecryption"
    "fmt"
    "net"
)

func main() {
    key := []byte{0, 6, 80, 90, 60, 255, 67, 45, 67, 80, 234, 255, 200, 100, 0, 245}
    l, _ := net.Listen("tcp", ":5678")
    for {
        conn, _ := l.Accept()
        server, _ := net.Dial("tcp", ":7890")
        go Do(conn, server, key)
    }
}

func Do(conn, server net.Conn, key []byte) {
    go func() {
        data := make([]byte, 4096)
        for {
            n, err := conn.Read(data)
            if err != nil {
                fmt.Println(err, "conn err")
                continue
            }
            endata := Encrytion.Endata(data[:n], key)
            server.Write(endata)
        }
    }()

    endata := make([]byte, 4096)
    for {
        n, err := server.Read(endata)
        if err != nil {
            fmt.Println(err, "server err")
            continue
        }
        dedata := Encrytion.Dedata(endata[:n], key)
        conn.Write(dedata)
    }
}

'''

//服务端 server.go:

''' package main

import (
    "EncryptionAndDecryption"
    "encoding/binary"
    "fmt"
    "net"
)

func main() {
    key := []byte{0, 6, 80, 90, 60, 255, 67, 45, 67, 80, 234, 255, 200, 100, 0, 245}

    l, _ := net.Listen("tcp", ":7890")
    for {
        conn, _ := l.Accept()
        go Do(conn, key)
    }
}

func Do(conn net.Conn, key []byte) {
    data := make([]byte, 4096)
    conn.Read(data)
    a := Encrytion.Endata([]byte{0x05, 0x00}, key)
    conn.Write(a)

    n, _ := conn.Read(data)
    dedata := Encrytion.Dedata(data[:n], key)
    atyp := dedata[3]
    addr := ""
    AddrPort := ""
    addrlen := 0
    switch atyp {
    case 1:
        addr = fmt.Sprintf("%d.%d.%d.%d", dedata[4], dedata[5], dedata[6], dedata[7])
        port := binary.BigEndian.Uint16(dedata[8:10])
        AddrPort = fmt.Sprintf("%s:%d", addr, port)

    case 3:
        addrlen = int(dedata[4])
        addr = string(dedata[5 : 5+addrlen])
        port := binary.BigEndian.Uint16(dedata[5+addrlen : 7+addrlen])
        AddrPort = fmt.Sprintf("%s:%d", addr, port)

    case 4:
        fmt.Println("sorry,no IPv6!")
        return
    }

    fmt.Println(AddrPort, len(AddrPort))
    to, err := net.Dial("tcp", AddrPort)
    if err != nil {
        fmt.Println(err)
        return
    }
    go func() {
        endata := make([]byte, 4096)
        for {
            n, err := conn.Read(endata)
            if err != nil {
                fmt.Println(err, "conn err")
                break
            }
            dedata := Encrytion.Dedata(endata[:n], key)
            fmt.Println(dedata)
            to.Write(dedata)
        }
    }()

    data = make([]byte, 4096)
    for {
        n, err := to.Read(data)
        if err != nil {
            fmt.Println(err, "to err")
            break
        }
        endata := Encrytion.Endata(data[:n], key)
        conn.Write(endata)
    }
}

'''