drxt70655
2017-12-04 12:34
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如何在Golang中发送伪造的udp软件包

Im trying to send a fake udp (a random mac address, let's say 01:ff:ff:ff:ff:ff) package to be handled by the ServeDHCP on the server side, Im running the following dhcpv4 github repository github.com/krolaw/dhcp4.

The goal of send a discover package, is to check if the dhcp is alive.

In fact I created a new func called check

func (h *DHCPHandler) check () {
    con, err = net.Dial("udp", "127.0.0.1:67")
    for {
            //fake udp package???
            time.Sleep(10 * time.Minute)
    }

}

in the main of the function, I have the following call go handler.check()

And in the ServeDHCP I should pass these parameters:
func (h *DHCPHandler) ServeDHCP(p dhcp.Packet, msgType dhcp.MessageType, options dhcp.Options)

How could I send a fake upd package from the func check?

图片转代码服务由CSDN问答提供 功能建议

我正在尝试发送伪造的udp(随机的mac地址,假设01:ff:ff:ff:ff:ff :ff)包将由服务器端的ServeDHCP处理,我正在运行以下dhcpv4 github存储库 github.com/ krolaw / dhcp4

发送发现包的目的是检查dhcp是否还存在。

实际上,我创建了一个名为check的新功能

  func(h * DHCPHandler)check(){
 con,err = net.Dial(“ udp”,“ 127.0.0.1:67")
 for {
  //假的udp包??? 
 time.Sleep(10 * time.Minute)
} 
   
 
 

} < p>在函数的主要部分中,我有以下调用 go handler.check()

,在ServeDHCP中,我应该传递这些参数:
func(h * DHCPHandler)ServeDHCP(p dhcp.Packet,msgType dhcp.MessageType,选项dhcp.Options)

如何发送伪造的upd软件包 从功能检查?

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1条回答 默认 最新

  • doutun1362 2017-12-05 13:45
    已采纳

    At the end I managed to make works this check to send in periods of 10 minuts an upd package with an mac address I know is gonna never be reached as following.

    func (h *DHCPHandler) check() {
        //Fetch parameters from config file
        config := getConfig() // here is a mac saved on a json file 01:ff:ff:ff:ff:ff
        macFake, err := net.ParseMAC(config.MacFake)
    
        if err != nil {
                fmt.Println("error with the fake mac provided on the json file", err)
        }
    
        // create connection
        conn, err := net.Dial("udp4", "127.0.0.1:67")
        if err != nil {
                fmt.Println("error with the connection", err)
        }
    
        //stay alive
        for {
                fmt.Fprintf(conn, "GET / HTTP/1.0
    
    ")
                conn.Write(dhcp.RequestPacket(dhcp.Discover, macFake, h.ip, []byte{0, 1, 2, 3}, true, nil))
                time.Sleep(10 * time.Minute)
        }
    

    }

    On the main function, I just need to call this check goroutine and add on the server side (ServeDHCP) this code:

        mac := p.CHAddr().String()
        //Fetch parameters from config file
        config := getConfig()
        if mac == config.MacFake { //udp package received and a mac saved on a json file 01:ff:ff:ff:ff:ff
                // send notification to restart if failure on a systemd
                daemon.SdNotify(false, "WATCHDOG=1")
                return
        }
    

    The last part needed is to add a systemd check, in my case I send the watchdog every 10 min, so, the systemd check will be setted it to 11min

    [Service]
    ExecStartPre=//something 
    WatchdogSec=11min 
    Restart=on-failure
    
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