Refactoring modules

modules/wifi/wifi_assoc.go

@@ -0,0 +1,126 @@
+package wifi
+
+import (
+	"bytes"
+	"fmt"
+	"net"
+	"sort"
+
+	"github.com/bettercap/bettercap/log"
+	"github.com/bettercap/bettercap/network"
+	"github.com/bettercap/bettercap/packets"
+)
+
+func (w *WiFiModule) sendAssocPacket(ap *network.AccessPoint) {
+	if err, pkt := packets.NewDot11Auth(w.Session.Interface.HW, ap.HW, 1); err != nil {
+		log.Error("cloud not create auth packet: %s", err)
+	} else {
+		w.injectPacket(pkt)
+	}
+
+	if err, pkt := packets.NewDot11AssociationRequest(w.Session.Interface.HW, ap.HW, ap.ESSID(), 1); err != nil {
+		log.Error("cloud not create association request packet: %s", err)
+	} else {
+		w.injectPacket(pkt)
+	}
+}
+
+func (w *WiFiModule) skipAssoc(to net.HardwareAddr) bool {
+	for _, mac := range w.assocSkip {
+		if bytes.Equal(to, mac) {
+			return true
+		}
+	}
+	return false
+}
+
+func (w *WiFiModule) isAssocSilent() bool {
+	if err, is := w.BoolParam("wifi.assoc.silent"); err != nil {
+		log.Warning("%v", err)
+	} else {
+		w.assocSilent = is
+	}
+	return w.assocSilent
+}
+
+func (w *WiFiModule) doAssocOpen() bool {
+	if err, is := w.BoolParam("wifi.assoc.open"); err != nil {
+		log.Warning("%v", err)
+	} else {
+		w.assocOpen = is
+	}
+	return w.assocOpen
+}
+
+func (w *WiFiModule) startAssoc(to net.HardwareAddr) error {
+	// parse skip list
+	if err, assocSkip := w.StringParam("wifi.assoc.skip"); err != nil {
+		return err
+	} else if macs, err := network.ParseMACs(assocSkip); err != nil {
+		return err
+	} else {
+		w.assocSkip = macs
+	}
+
+	// if not already running, temporarily enable the pcap handle
+	// for packet injection
+	if !w.Running() {
+		if err := w.Configure(); err != nil {
+			return err
+		}
+		defer w.handle.Close()
+	}
+
+	toAssoc := make([]*network.AccessPoint, 0)
+	isBcast := network.IsBroadcastMac(to)
+	for _, ap := range w.Session.WiFi.List() {
+		if isBcast || bytes.Equal(ap.HW, to) {
+			if !w.skipAssoc(ap.HW) {
+				toAssoc = append(toAssoc, ap)
+			} else {
+				log.Debug("skipping ap:%v because skip list %v", ap, w.assocSkip)
+			}
+		}
+	}
+
+	if len(toAssoc) == 0 {
+		if isBcast {
+			return nil
+		}
+		return fmt.Errorf("%s is an unknown BSSID or it is in the association skip list.", to.String())
+	}
+
+	go func() {
+		w.writes.Add(1)
+		defer w.writes.Done()
+
+		// since we need to change the wifi adapter channel for each
+		// association request, let's sort by channel so we do the minimum
+		// amount of hops possible
+		sort.Slice(toAssoc, func(i, j int) bool {
+			return toAssoc[i].Channel() < toAssoc[j].Channel()
+		})
+
+		// send the association request frames
+		for _, ap := range toAssoc {
+			if w.Running() {
+				logger := log.Info
+				if w.isAssocSilent() {
+					logger = log.Debug
+				}
+
+				if ap.IsOpen() && !w.doAssocOpen() {
+					log.Debug("skipping association for open network %s (wifi.assoc.open is false)", ap.ESSID())
+				} else {
+					logger("sending association request to AP %s (channel:%d encryption:%s)", ap.ESSID(), ap.Channel(), ap.Encryption)
+
+					w.onChannel(ap.Channel(), func() {
+						w.sendAssocPacket(ap)
+					})
+				}
+			}
+		}
+	}()
+
+	return nil
+}