create a http server with a trace route in go

Here's an example of a simple HTTP server in Go that supports trace route:


main.go
package main

import (
	"fmt"
	"net/http"
)

func main() {
	http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
		fmt.Fprintln(w, "Hello, world!")
	})
	http.HandleFunc("/traceroute", func(w http.ResponseWriter, r *http.Request) {
		target := r.URL.Query().Get("target")
		if target == "" {
			http.Error(w, "Missing target parameter", http.StatusBadRequest)
			return
		}
		output, err := traceRoute(target)
		if err != nil {
			http.Error(w, err.Error(), http.StatusInternalServerError)
			return
		}
		fmt.Fprint(w, output)
	})
	fmt.Println("Server listening on http://localhost:8080")
	http.ListenAndServe(":8080", nil)
}

func traceRoute(target string) (string, error) {
	// Implement trace route logic here
	return "Traceroute to " + target, nil
}
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In the above code, we define two HTTP request handlers:

The first handler is for the root path ("/"), and simply responds with a "Hello, world!" message.
The second handler is for the "/traceroute" path, and expects a "target" parameter in the GET query string. It then calls a traceRoute function to perform the trace route logic and returns the output as a plain text response.

The traceRoute function is not implemented in the code snippet above. This is where you would need to write your networking logic to perform the trace route. One way to do this is to use the exec.Command function to invoke the traceroute command-line tool, like so:


main.go
func traceRoute(target string) (string, error) {
	cmd := exec.Command("traceroute", target)
	output, err := cmd.Output()
	if err != nil {
		return "", err
	}
	return string(output), nil
}
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Note that this implementation relies on the traceroute tool being installed and available on the system running the Go program. Alternatively, you could implement the trace route logic manually by sending ICMP packets and analyzing the responses.

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