Let’s talk about the principle of flood attack in Golang

Flood attack is a malicious network attack method that overloads the target server by forging a large number of requests, causing the service to be unavailable. So how to write a simple flood attacker using Golang? This article will introduce the principles, coding and usage of flood attacks in Golang.

1. Principle of flood attack

First, let us understand the principle of flood attack. When we usually browse network resources, after we enter the website address in the address bar, an HTTP request will be sent to the target server. This HTTP request contains the parameters we need, and the server will return the corresponding resources or data after receiving the request.

The principle of flood attack is to simulate normal requests, but it requires a large number of forged requests, allowing the server to continuously process these requests, causing the server resources to be exhausted, unable to continue to respond to normal requests, and eventually causing the target server to crash. machine.

The principle of flood attack is very simple, and the code implementation is also very easy.

2. Write code

Next, we start writing code.

Write the simplest network request code:

func httpGet(url string){
    resp, err := http.Get(url)
    if err != nil {
        log.Println(err.Error())
        return
    }
    defer resp.Body.Close()
}

The above code implements a simple GET request and closes the response Body.

Next, we need to implement a function that triggers a flood attack. We need to define an infinite loop to continuously initiate network requests to achieve a flood attack.

func flood(url string, num int){
    i := 0
    for {
        i++
        httpGet(url)
        if i > num{
            log.Println("Attack finished.")
            return
        }
    }
}

In the above code, we defined a variable i to record how many requests were sent. In each loop, we call the httpGet function to send a request to the target server. When the number of requests sent is greater than the set num, the flood attack will be stopped. In the above code, we use the log package to output the message that the attack has ended. We can also output detailed information during the attack to facilitate later analysis.

While we implement the flood attack, we also need to consider the stopping conditions of the main program. We can manually control the stop of the program through keyboard input. Add the following code:

func main(){
    var url string
    var num int
    
    fmt.Print("Target url: ")
    fmt.Scanf("%s", &url)
    
    fmt.Print("Number of requests: ")
    fmt.Scanf("%d", &num)
    
    fmt.Println("Press Enter to start attack.")
    bufio.NewReader(os.Stdin).ReadBytes('\n')
    
    flood(url, num)
}

After running the program, we can enter the target URL and the number of requests into the program, and then press Enter to start the attack. When the number of attacks reaches the set number or the program is manually stopped, the attack ends.

3. How to use

Below, we introduce how to use this program to carry out flood attacks.

First, we need to enter the directory of the program in the terminal and use the go build command to compile.

go build flood.go

After the compilation is completed, we can run the program:

./flood

Then, follow the prompts to enter the target URL and the number of requests, and press Enter to start the attack.

While the program is running, you can stop the program by using the Ctrl C shortcut key. At this point, the program will exit the current loop and output a message that the attack is over.

It should be noted that flood attack is a vicious attack method and is for learning and research purposes only. Do not use this program for illegal attacks.

Summary

This article introduces how to use Golang to implement flood attacks. We learned how flooding attacks work, the steps to code them, and how to use them. At the same time, we also need to always pay attention to network security and protect our network environment.

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