Add Argument parser and flexible ports and destination

knockr.go

@@ -4,13 +4,27 @@ import (
 	"fmt"
 	"io"
 	"net"
+	"github.com/mkideal/cli"
 )
 
+type knockArguments struct {
+	cli.Helper
+	WhitelistPort int `cli:'wp' usage:'The port to launch the whitelist server on'`
+	GatewayPort int `cli:'gp' usage:'The port to protect'`
+	Destination string `cli:'d' usage:'The destination to relay traffic to'`
+}
+
 var whitelist []string
+var arguments *knockArguments
 
 func main() {
-	go listener(9090, whitelist_handler)
-	listener(8080, gateway_handler)
+	cli.Run(new(knockArguments), func(ctx *cli.Context) error {
+		arguments = ctx.Argv() . (*knockArguments)
+		return nil
+	})
+
+	go listener(arguments.WhitelistPort, whitelist_handler)
+	listener(arguments.GatewayPort, gateway_handler)
 }
 
 func listener(port int, listen_func func(c net.Conn)) {
@@ -68,7 +82,7 @@ func is_whitelisted(addr string) bool {
 }
 
 func proxy(c net.Conn) {
-	ln, err := net.Dial("tcp", "ip.darknebu.la:443")
+	ln, err := net.Dial("tcp", arguments.Destination)
 	if err != nil {
 		fmt.Println("[ERR] Proxy connection to server failed")
 	} else {