misc: small fix or general refactoring i did not bother commenting

modules/wifi_beacon_flood.go

@@ -11,16 +11,32 @@ import (
 	"github.com/google/gopacket/layers"
 )
 
-func NewDot11Beacon(bssid net.HardwareAddr, ssid string, seq uint16) (error, []byte) {
+type Dot11EncryptionType int
+
+const (
+	Dot11Open Dot11EncryptionType = iota
+	Dot11Wep
+	Dot11WpaTKIP
+	Dot11WpaAES
+)
+
+type Dot11BeaconConfig struct {
+	SSID       string
+	BSSID      net.HardwareAddr
+	Channel    int
+	Encryption Dot11EncryptionType
+}
+
+func NewDot11Beacon(conf Dot11BeaconConfig) (error, []byte) {
 	// TODO: still very incomplete
 	return packets.Serialize(
 		&layers.RadioTap{},
 		&layers.Dot11{
 			Address1:       network.BroadcastHw,
-			Address2:       bssid,
-			Address3:       bssid,
+			Address2:       conf.BSSID,
+			Address3:       conf.BSSID,
 			Type:           layers.Dot11TypeMgmtBeacon,
-			SequenceNumber: seq, // not sure this needs to be a specific value
+			SequenceNumber: 0, // not sure this needs to be a specific value
 		},
 		&layers.Dot11MgmtBeacon{
 			Timestamp: uint64(time.Now().Second()), // not sure
@@ -29,8 +45,8 @@ func NewDot11Beacon(bssid net.HardwareAddr, ssid string, seq uint16) (error, []b
 		},
 		&layers.Dot11InformationElement{
 			ID:     layers.Dot11InformationElementIDSSID,
-			Length: uint8(len(ssid) & 0xff),
-			Info:   []byte(ssid),
+			Length: uint8(len(conf.SSID) & 0xff),
+			Info:   []byte(conf.SSID),
 		},
 		// TODO: Rates n stuff ...
 		&layers.Dot11InformationElement{
@@ -50,7 +66,14 @@ func (w *WiFiModule) sendBeaconPacket(counter int) {
 	w.writes.Add(1)
 	defer w.writes.Done()
 
-	if err, pkt := NewDot11Beacon(w.Session.Interface.HW, "Prova", uint16(counter)); err != nil {
+	conf := Dot11BeaconConfig{
+		SSID:       "Prova",
+		BSSID:      w.Session.Interface.HW,
+		Channel:    1,
+		Encryption: Dot11Open,
+	}
+
+	if err, pkt := NewDot11Beacon(conf); err != nil {
 		log.Error("Could not create beacon packet: %s", err)
 	} else {
 		w.injectPacket(pkt)