Continuously execute tshark from Go script - go

Question

I am trying to execute tskarh from golang script using the example from
https://tutorialedge.net/golang/executing-system-commands-with-golang/
The script works fine, but i don't receive any kind of output
What i want to get is the following:
Continuously run the script,
capture some packets,
extract some fields values,
and assign to variables
Any help please ?
https://pastebin.com/PeAz7vh9
package main
import (
"fmt"
"os/exec"
"runtime"
)
func execute() {
// here we perform the pwd command.
// we can store the output of this in our out variable
// and catch any errors in err
out, err := exec.Command("tshark", "-i", "em1").CombinedOutput()
// if there is an error with our execution
// handle it here
if err != nil {
fmt.Printf("%s", err)
}
fmt.Println("Command Successfully Executed")
// as the out variable defined above is of type []byte we need to convert
// this to a string or else we will see garbage printed out in our console
// this is how we convert it to a string
output := string(out[:])
// once we have converted it to a string we can then output it.
fmt.Println(output)
}
func main() {
fmt.Println("Simple Shell")
fmt.Println("---------------------")
if runtime.GOOS == "windows" {
fmt.Println("Can't Execute this on a windows machine")
} else {
execute()
}
}

Answer 1

I have no idea of tshark, but here is a code that will work continously, you need os.Interrupt, and select.
package main
import (
"os"
"os/exec"
"os/signal"
)
func main() {
out := exec.Command("ping", "8.8.8.8")
f1, _ := os.OpenFile("./outfile.txt", os.O_RDWR|os.O_CREATE|os.O_APPEND, 0755)
f2, _ := os.OpenFile("./errfile.txt", os.O_RDWR|os.O_CREATE|os.O_APPEND, 0755)
out.Stdout = f1
out.Stderr = f2
defer func() {
f1.Close()
f2.Close()
}()
err := out.Run()
if err != nil {
panic(err)
}
var ctrlcInt chan os.Signal
ctrlcInt = make(chan os.Signal, 1)
signal.Notify(ctrlcInt, os.Interrupt)
for {
select {
case <-ctrlcInt:
break
default:
continue
}
}
return
}
this code pings 8.8.8.8 and writes out put to outfile.txt, it will exit when you press ctrl+c. If there is error it will write to errfile.txt. You can tail the files and see the output. Hope this helps.