from scapy.layers.l2 import ARP, Ether
from scapy.sendrecv import srp
import netifaces
from netaddr import IPNetwork


class NetworkScanner:
    """Иницилазицая сетевого сканера"""

    def __init__(self, interface=None):
        """Инициализация параметров интерфейсов"""
        self.interface = (
            interface or netifaces.gateways()["default"][netifaces.AF_INET][1]
        )
        self.ip_info = netifaces.ifaddresses(self.interface).get(netifaces.AF_INET, [])
        self.networks = [
            IPNetwork(f"{ip['addr']}/{ip['netmask']}") for ip in self.ip_info
        ]
        self.local_mac = netifaces.ifaddresses(self.interface)[netifaces.AF_LINK][0][
            "addr"
        ]

    def _create_arp_packet(self, target_ip):
        """Создание пакета ARP для отправки"""
        arp = ARP(pdst=target_ip)
        ether = Ether(dst="ff:ff:ff:ff:ff:ff")
        return ether / arp

    def scan_network(self, attempts=3, timeout=2):
        """Подготовка к сканированию сети"""
        all_clients = []

        for network in self.networks:
            target_ip = f"{network.network}/{network.prefixlen}"
            packet = self._create_arp_packet(target_ip)
            clients = []

            for _ in range(attempts):
                result = srp(packet, timeout=timeout, iface=self.interface, verbose=0)[
                    0
                ]
                for _, received in result:
                    client = {"ip": received.psrc, "mac": received.hwsrc}
                    if client not in clients:  # Избегаем дублирования клиентов
                        clients.append(client)

            all_clients.extend(clients)

        # Добавляет все локальные IP-адреса интерфейса как клиенты
        for ip_info in self.ip_info:
            local_client = {"ip": ip_info["addr"], "mac": self.local_mac}
            if local_client not in all_clients:
                all_clients.append(local_client)

        # Удаление дубликатов
        unique_clients = {tuple(client.items()) for client in all_clients}
        return [dict(client) for client in unique_clients]

    def print_clients(self, clients):
        """Лист адресов клиентов"""
        print("Доступные устройства в сети:")
        print("IP" + " " * 18 + "MAC")
        for client in sorted(clients, key=lambda x: x["ip"]):
            print(f"{client['ip']:<16}    {client['mac']}")


if __name__ == "__main__":
    scanner = NetworkScanner()
    clients = scanner.scan_network()
    scanner.print_clients(clients)