获取KeyLogFile

tls.config自带了接口，所以配置的时候只需要打开就行，以客户端为例
keylogfile 是一个 io.Writer 开了这个就自动使用了

keyLogFile, _ := os.OpenFile(keyLogFilePath, os.O_WRONLY|os.O_CREATE|os.O_TRUNC, 0600)

// 2. 配置tls 打开了KeyLogWriter
tlsConfig := &tls.Config{
    InsecureSkipVerify: true,
    KeyLogWriter:       keyLogFile,
}

示例代码：

1. client

package main

import (
	"crypto/tls"
	"fmt"
	"log"
	"net"
	"os"
)

const (
	HOST           = "localhost"
	PORT           = "8443"
	KEYLOGFILEPATH = "E:\\Martin_Code\\Go\\src\\lesson-03-tls\\02-myTls\\keylogfile-clent.txt"
)

func main() {

	if err := tlsWithKeyLog(HOST, KEYLOGFILEPATH); err != nil {
		log.Fatalf("tlsWithKeyLog error: %s \n", err)
		os.Exit(1)
	}

}

func tlsWithKeyLog(url, keyLogFilePath string) error {
	// 1. 创建一个文件 已有则覆盖了
	keyLogFile, _ := os.OpenFile(keyLogFilePath, os.O_WRONLY|os.O_CREATE|os.O_TRUNC, 0600)
	fmt.Fprintf(keyLogFile, "# SSL/TLS secrets log file, generated by go\n")

	// 2. 配置tls 打开了KeyLogWriter
	tlsConfig := &tls.Config{
		InsecureSkipVerify: true,
		KeyLogWriter:       keyLogFile,
	}

	// 建立tls连接
	conn, err := tls.Dial("tcp", net.JoinHostPort(HOST, PORT), tlsConfig)
	if err != nil {
		log.Fatalf("客户端Dial()失败：%s", err)
	}
	defer conn.Close()

	conn.Write([]byte("Hello world"))

	return nil
}

2. client

package main

import (
	"crypto/tls"
	"fmt"
	"io"
	"log"
	"net"
	"os"
)

const (
	CERTFILEPATH   = "E:\\Martin_Code\\Go\\src\\lesson-03-tls\\02-myTls\\server.crt"
	KEYFILEPATH    = "E:\\Martin_Code\\Go\\src\\lesson-03-tls\\02-myTls\\server.key"
	KEYLOGFILEPATH = "E:\\Martin_Code\\Go\\src\\lesson-03-tls\\02-myTls\\keylogfile-server.txt"
)

func handleConn(conn net.Conn) {
	log.Printf("服务器收到连接：%s", conn.RemoteAddr())
	defer conn.Close()

	conn.Write([]byte("Hello, 这里是配置了TLS的服务器!\n"))

	for {
		buf := make([]byte, 1024)
		n, err := conn.Read(buf)
		if err != nil {
			if err == io.EOF {
				log.Println("客户端关闭连接")
			} else {
				log.Printf("服务器读取数据失败：%s", err)
			}
			return
		}
		fmt.Printf("服务器收到数据：%s\n", string(buf[:n]))
	}
}

func main() {
	// 1. 服务器 加载证书和私钥
	cert, err := tls.LoadX509KeyPair(CERTFILEPATH, KEYFILEPATH)
	if err != nil {
		log.Fatalf("服务器加载证书失败：%s", err)
	}
	log.Println("服务器加载证书成功！")

	// 1.1 设置keylog文件
	keyLogFile, _ := os.OpenFile(KEYLOGFILEPATH, os.O_WRONLY|os.O_CREATE|os.O_TRUNC, 0600)
	fmt.Fprintf(keyLogFile, "# SSL/TLS secrets log file, generated by go\n")

	// 2. 创建TLS配置，并指定证书和私钥
	config := &tls.Config{
		Certificates: []tls.Certificate{cert},
		KeyLogWriter: keyLogFile,
	}
	log.Println("服务器TLS配置创建成功！")

	// 3. 监听
	listen, err := tls.Listen("tcp", ":8443", config)
	if err != nil {
		log.Fatalf("服务器监听失败： %s", err)
	}
	log.Println("服务器监听成功！")
	defer listen.Close()

	// 4. 开启Accept
	for {
		conn, err := listen.Accept()
		if err != nil {
			log.Printf("服务器Accept()失败：%s", err)
			continue
		}
		// 5. 处理连接
		go handleConn(conn)

	}
}

3. 效果