问题内容
我正在通过 netcat 监听
nc -lkp 1902
每当我建立 tcp 连接并尝试发送日志时，它都会起作用
timeout := 30 * time.second
conn, err := net.dialtimeout("tcp", "localhost:1902", timeout)
if err != nil {
panic("failed to connect to localhost:1902")
}
defer conn.close()
f := log.ldate | log.lshortfile
logger := log.new(conn, "example-", f)
logger.println("this is a regular message1")
logger.println("this is a regular message2")
logger.println("this is a regular message3")
logger.println("this is a regular message4")
logger.println("this is a regular message5")
logger.println("this is a regular message6")
输出
example-2022/11/18 technique24.go:21: this is a regular message1 example-2022/11/18 technique24.go:22: this is a regular message2 example-2022/11/18 technique24.go:23: this is a regular message3 example-2022/11/18 technique24.go:24: this is a regular message4 example-2022/11/18 technique24.go:25: this is a regular message5 example-2022/11/18 technique24.go:26: this is a regular message6
但是每当我尝试建立 udp 连接时它都不起作用，有人可以解释为什么我的记录器上什么也没有得到吗？
timeout := 30 * time.Second
conn, err := net.DialTimeout("udp", "localhost:1902", timeout)
if err != nil {
panic("Failed to connect to localhost:1902")
}
defer conn.Close()
f := log.Ldate | log.Lshortfile
logger := log.New(conn, "example-", f)
logger.Println("This is a regular message1")
logger.Println("This is a regular message2")
logger.Println("This is a regular message3")
logger.Println("This is a regular message4")
logger.Println("This is a regular message5")
logger.Println("This is a regular message6")
想要制作一个小poc来通过udp发送日志以减少积压，尝试首先建立tcp连接，它工作正常，但udp不起作用，有人可以解释我必须做什么才能使其工作吗？ p>
正确答案
除非另有指定，否则 Netcat 默认情况下会创建 TCP 连接。对于 UDP 连接，您需要使用 netcat 的 -u 标志。来自 netcat 手册页
-u 使用 UDP 代替默认的 TCP 选项。
因此，将侦听器更改为 nc -luk 1902 应该可以解决 UDP 连接的问题。
