Golang UDP Server只接收本地发送的数据包 [英] Golang UDP Server only recieving locally sent packets
问题描述
我在Go上编写了一个UDP服务器(监听端口666),它似乎只接收本地发送的数据包。为了确认流量,我一直在使用:
sudo tcpdump -n udp dst port 666
$ c $我的(简称)服务器代码:
importnet
func startServer(){
//绑定端口。
ServerAddr,err:= net.ResolveUDPAddr(udp,localhost:666)
if err!= nil {
fmt.Println(Error binding port!)
ServerConn,_:= net.ListenUDP(udp,ServerAddr)
defer ServerConn.Close()
buf:= make([ ]字节,1024)
用于{
//接收UDP数据包并将其解组为一个protobuf。
n,_,_:= ServerConn.ReadFromUDP(buf)
fmt.Println(Packet received!)
//用buf做东西。
$ b如果从服务器运行的机器上运行,我使用:
echo -nfoo| nc -4u -w1 127.0.0.1 666
然后服务器接收到该数据包,并打印该消息(并且tcpdump显示没有输出)。
但是,如果我从网络上的另一台计算机上运行以下命令:
echo -nfoo| nc -4u -w1 192.168.1.134 666
然后,tcpdump报告正在收到的数据包( 15:05:43.634604 IP 192.168.1.113.59832> 192.168.1.134.666:UDP,长度9
确认我获得了IP地址),Go服务器不响应。
有没有什么特别的事情可以让Go响应非本地请求?
解决 ServerAddr,err: = net.ResolveUDPAddr(udp,:666)
I've written a UDP Server in Go(listens on port 666), and it seems to be only receiving packets that were sent locally. To confirm traffic, I have been using:
sudo tcpdump -n udp dst port 666
My(abbreviated) server code:
import "net"
func startServer() {
// Bind the port.
ServerAddr, err := net.ResolveUDPAddr("udp", "localhost:666")
if err != nil {
fmt.Println("Error binding port!")
}
ServerConn, _ := net.ListenUDP("udp", ServerAddr)
defer ServerConn.Close()
buf := make([]byte, 1024)
for {
// Recieve a UDP packet and unmarshal it into a protobuf.
n, _, _ := ServerConn.ReadFromUDP(buf)
fmt.Println("Packet received!")
// Do stuff with buf.
}
}
If, from the machine the server is running on, I use:
echo -n "foo" | nc -4u -w1 127.0.0.1 666
then the server receives that packet, and prints the message(and tcpdump shows no output).
However, if I run the following from another computer on the network:
echo -n "foo" | nc -4u -w1 192.168.1.134 666
Then, while tcpdump reports a packet being received (15:05:43.634604 IP 192.168.1.113.59832 > 192.168.1.134.666: UDP, length 9
confirming I got the IP address right), the Go server does not respond.
Is there something special I need to do to make Go respond to non-local requests?
解决方案 Just listen on any address, you're listening on localhost only.
ServerAddr, err := net.ResolveUDPAddr("udp", ":666")
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