英文:
Golang TCP connection works, but UDP does not
问题
我正在通过netcat监听，命令如下：
nc -lkp 1902
每当我建立一个TCP连接并尝试发送日志时，它都能正常工作。
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")
输出结果如下：
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，当我尝试建立一个UDP连接时，它不起作用，为什么我的日志记录器上没有任何输出呢？
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")
我想创建一个小的POC来通过UDP发送日志以减少积压，我尝试先建立一个TCP连接，它可以正常工作，但UDP不起作用，有人能解释一下我需要做什么才能使其工作吗？
英文:
I'm listening via netcat as such
nc -lkp 1902
Whenever I make a tcp connection and try to send logs it works
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")
Output
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
But whenever I try to make a udp connection it does not work, could anyone explain why I get nothing on my logger?
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")
Want to make a small poc for sending logs over udp to reduce backlog, tried to make a tcp connection first and it works fine but udp does not work, could anyone explain what I have to do to make it work?
答案1
得分: 0
Netcat默认创建TCP连接，除非另有指定。对于UDP连接，您需要使用netcat的-u标志。从netcat的man页面中可以看到：
> -u 使用UDP而不是默认的TCP选项。
因此，将您的监听器更改为nc -luk 1902应该可以解决UDP连接的问题。
英文:
Netcat by default creates a TCP connection unless specified otherwise. For UDP connections, you need to use the -u flag of the netcat. From man page of netcat
> -u Use UDP instead of the default option of TCP.
So changing your listener to nc -luk 1902 should fix the issue for UDP connections.
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