Initial Commit

main.go

@@ -0,0 +1,44 @@
+package main
+
+import (
+	"fmt"
+	"log"
+	"net"
+	"os"
+	"strings"
+)
+
+var version string
+
+func main() {
+	ips := os.Args[1:]
+	switch {
+	case len(ips) == 0:
+		log.Fatal("Expect at least one argument")
+	case len(ips) >= 2:
+		log.Fatal("Expect only one argument")
+	}
+
+	ip := strings.Split(ips[0], "/")[0]
+
+	interfaces, err := net.Interfaces()
+	if err != nil {
+		log.Fatal(err.Error())
+	}
+
+	for _, iface := range interfaces {
+		addrs, err := iface.Addrs()
+		if err != nil {
+			log.Fatal(err.Error())
+		}
+
+		for _, addr := range addrs {
+			if strings.Split(addr.String(), "/")[0] == ip {
+				fmt.Fprintln(os.Stdout, iface.Name)
+				return
+			}
+		}
+	}
+
+	os.Exit(1)
+}