Golang : Check whether a network interface is up on your machine
Problem:
You have multiple network interfaces on your machine and you need to know the status of a particular network interface is actually up before routing command to it.
Solution:
The code example that follows will use the net
package's InterfaceByName()
function to probe the interface status for a given interface name. If the given network interface is not available, the program will list out the available network interfaces.
Here you go!
package main
import (
"fmt"
"net"
"os"
"strings"
)
func availableInterfaces() {
interfaces, err := net.Interfaces()
if err != nil {
fmt.Print(err)
os.Exit(0)
}
fmt.Println("Available network interfaces on this machine : ")
for _, i := range interfaces {
fmt.Printf("Name : %v \n", i.Name)
}
}
func main() {
if len(os.Args) != 2 {
fmt.Printf("Usage : %s <interface name>\n", os.Args[0])
os.Exit(0)
}
ifName := os.Args[1]
byNameInterface, err := net.InterfaceByName(ifName)
if err != nil {
fmt.Println(err, "["+ifName+"]")
fmt.Println("-----------------------------")
availableInterfaces()
os.Exit(0)
}
if strings.Contains(byNameInterface.Flags.String(), "up") {
fmt.Println("Status : UP")
} else {
fmt.Println("Status : DOWN")
}
}
Sample output for my own machine. Your machine will show different results.
$ ./getifacestatus stf0
Status : DOWN
$ ./getifacestatus en3
Status : UP
$ ./getifacestatus eth0
route ip+net: no such network interface [eth0]
-----------------------------
Available network interfaces on this machine :
Name : lo0
Name : gif0
Name : stf0
Name : en3
References:
See also : Golang : Get the IPv4 and IPv6 addresses for a specific network interface
By Adam Ng
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