golang 编写TLS加密数据转发-DPDK中文网

以下是使用Golang编写TLS加密数据转发的示例代码：

package main

import (
    "crypto/tls"
    "flag"
    "log"
    "net"
)

func main() {
    var (
        listenAddr = flag.String("listen", ":8000", "listen address")
        remoteAddr = flag.String("remote", "example.com:443", "remote address")
        certFile   = flag.String("cert", "server.crt", "TLS certificate file")
        keyFile    = flag.String("key", "server.key", "TLS private key file")
    )
    flag.Parse()

    // Load TLS certificate and private key
    cert, err := tls.LoadX509KeyPair(*certFile, *keyFile)
    if err != nil {
        log.Fatalf("failed to load TLS certificate/key: %v", err)
    }

    // Configure TLS server
    tlsConfig := &tls.Config{Certificates: []tls.Certificate{cert}}

    // Listen for incoming connections
    listener, err := tls.Listen("tcp", *listenAddr, tlsConfig)
    if err != nil {
        log.Fatalf("failed to listen on %s: %v", *listenAddr, err)
    }
    defer listener.Close()

    log.Printf("listening on %s, forwarding to %s\n", *listenAddr, *remoteAddr)

    for {
        // Accept incoming connection
        localConn, err := listener.Accept()
        if err != nil {
            log.Printf("failed to accept incoming connection: %v\n", err)
            continue
        }

        go func() {
            // Dial remote server
            remoteConn, err := tls.Dial("tcp", *remoteAddr, tlsConfig)
            if err != nil {
                log.Printf("failed to dial remote server: %v\n", err)
                localConn.Close()
                return
            }
            defer remoteConn.Close()

            // Start forwarding data between local and remote connections
            go forwardData(localConn, remoteConn)
            forwardData(remoteConn, localConn)
        }()
    }
}

func forwardData(src, dest net.Conn) {
    buf := make([]byte, 1024)
    for {
        n, err := src.Read(buf)
        if err != nil {
            log.Printf("failed to read data: %v\n", err)
            break
        }

        _, err = dest.Write(buf[:n])
        if err != nil {
            log.Printf("failed to write data: %v\n", err)
            break
        }
    }
}

在上述代码中，我们首先从命令行参数中读取监听地址、远程地址以及TLS证书和私钥的文件路径。然后，我们加载TLS证书和私钥，并使用它们创建一个TLS配置对象。接下来，我们监听传入的TCP连接并使用TLS进行加密。对于每个传入的连接，我们都会启动一个新的协程来处理它。我们首先建立与远程服务器的TLS连接，然后开始将数据从本地连接转发到远程连接，直到其中一个连接关闭或出现错误。如果出现连接错误，则我们会关闭两个连接并终止该协程。

需要注意的是，在实际生产环境中，我们需要更加严格的错误处理和安全措施，例如限制并发连接数、验证远程服务器的TLS证书等。