add port argument

whoami.go

@@ -5,6 +5,7 @@ import (
 	"net"
 	"strings"	
         "encoding/base32"
+	"os"
 )
 
 // DomainFromIP derives a meshname subdomain for the authoritative DNS server address
@@ -27,6 +28,13 @@ func handler(w http.ResponseWriter, r *http.Request) {
 
 func main() {
 	http.HandleFunc("/", handler)
-	http.ListenAndServe(":3000", nil)
+	listenPort := "3000"
+	// Get the first command-line argument
+	if len(os.Args) > 1 {
+		listenPort = os.Args[1]
+	}
+	print("Listening on port:", listenPort, "\n")
+	listenPort = strings.Join([]string{":", listenPort}, "")
+	http.ListenAndServe(listenPort, nil)
 }