gonets/SRV/services/subnet_service.py

from scapy.config import conf
from mac_vendor_lookup import MacLookup
from typing import List, Optional, Tuple, Dict
import socket
import logging
import netifaces
import ipaddress
from concurrent.futures import ThreadPoolExecutor
import time
from functools import lru_cache
import json
from pathlib import Path
from datetime import datetime, timedelta
import subprocess

from scapy.layers.l2 import ARP, Ether
from scapy.sendrecv import srp
from utils.i18n import get_translations
from babel.support import Translations
from fastapi import Depends

from models.subnet import SubnetScanResult, Device

logging.basicConfig(
    level=logging.INFO,
    format="%(asctime)s - %(name)s - %(levelname)s - %(message)s"
)
logger = logging.getLogger(__name__)

class NetworkScanner:
    """Класс для сканирования подсети с использованием ARP-запросов."""
    def __init__(self, interface: str, translations: Translations = Depends(get_translations())):
        self.interface = interface
        conf.iface = interface
        self.translations = translations

    def scan(self, subnet: str) -> List[Tuple[str, str]]:
        try:
            arp = ARP(pdst=subnet)
            ether = Ether(dst="ff:ff:ff:ff:ff:ff")
            packet = ether / arp
            result = srp(packet, timeout=2, verbose=False, iface=self.interface)[0]
            return [(received.psrc, received.hwsrc) for sent, received in result]
        except Exception as e:
            logger.error(f"Error scanning subnet {subnet}: {str(e)}")
            return []

class PortScanner:
    """Класс для сканирования открытых портов на устройствах."""
    def __init__(self, interface: str, translations: Translations = Depends(get_translations())):
        self.interface = interface
        self.translations = translations

    def scan(self, ip: str) -> List[str]:
        return []

class DeviceInfoCollector:
    """Класс для сбора информации об устройствах, включая вендоров и хостнеймы."""
    def __init__(self, translations: Translations = Depends(get_translations())):
        self.mac_lookup = MacLookup()
        self.nbtscan_cache = {}
        self.nbtscan_results = {}
        if not hasattr(translations, 'gettext'):
            logger.warning("Translations object does not support gettext, using fallback")
            self.translations = Translations.load("utils/locales/en/LC_MESSAGES/services.mo")
        else:
            self.translations = translations

    @lru_cache(maxsize=1000)
    def get_vendor(self, mac: str) -> str:
        try:
            return self.mac_lookup.lookup(mac)
        except Exception as e:
            logger.warning(f"Failed to determine vendor for MAC {mac}: {str(e)}")
            return self.translations.gettext("Неизвестный")

    def scan_nbtscan(self, subnet: str) -> None:
        if subnet not in self.nbtscan_results:
            try:
                logger.debug(f"Starting nbtscan for subnet {subnet}")
                result = subprocess.run(["sudo", "nbtscan", "-r", str(subnet)],
                                       capture_output=True,
                                       text=True,
                                       check=False,
                                       timeout=10)
                logger.debug(f"Full nbtscan output: {result.stdout}")
                if result.returncode == 0:
                    for line in result.stdout.splitlines():
                        logger.debug(f"Processing line: {line}")
                        if not line.startswith(("IP address", "-", "Doing NBT")):
                            parts = [p for p in line.split() if p]
                            if len(parts) >= 2:
                                ip_addr, hostname = parts[0], parts[1]
                                if hostname != "<unknown>":
                                    self.nbtscan_cache[ip_addr] = hostname
                                    logger.info(f"NetBIOS: Found hostname {hostname} for IP {ip_addr}")
                self.nbtscan_results[subnet] = True
            except subprocess.TimeoutExpired:
                logger.error(f"NetBIOS: Timeout for subnet {subnet}")
            except Exception as e:
                logger.error(f"NetBIOS: Error for subnet {subnet}: {str(e)}")

    def get_hostname(self, ip: str) -> Optional[str]:
        try:
            socket.setdefaulttimeout(2)
            return socket.gethostbyaddr(ip)[0]
        except (socket.herror, socket.gaierror, socket.timeout):
            logger.debug(f"DNS: Failed to resolve name for IP {ip}")

        subnet = ipaddress.ip_network(f"{ip}/24", strict=False)
        if subnet not in self.nbtscan_results:
            self.scan_nbtscan(str(subnet))

        if ip in self.nbtscan_cache:
            return self.nbtscan_cache[ip]

        logger.debug(f"Failed to determine hostname for IP {ip} via DNS or NetBIOS")
        return None

class DeviceStorage:
    """Класс для хранения и управления данными об устройствах."""
    def __init__(self, storage_path: str = "storage/devices/devices.json", translations: Translations = Depends(get_translations())):
        self.storage_file = Path(storage_path)
        self.storage_file.parent.mkdir(parents=True, exist_ok=True)
        self.offline_timeout = timedelta(days=7)
        if not hasattr(translations, 'gettext'):
            logger.warning("Translations object does not support gettext, using fallback")
            self.translations = Translations.load("utils/locales/en/LC_MESSAGES/services.mo")
        else:
            self.translations = translations

    def load_devices(self) -> Dict[str, Device]:
        try:
            if self.storage_file.exists():
                with open(self.storage_file, "r", encoding="utf-8") as f:
                    data = json.load(f)
                    if not isinstance(data, dict) or "devices" not in data:
                        logger.warning(f"Invalid JSON structure in {self.storage_file}, expected {'devices': [...]}, got {data}")
                        return {}
                    devices = {}
                    for device_data in data.get("devices", []):
                        device = Device(**device_data)
                        if device.mac:
                            devices[device.mac] = device
                    return self._clean_old_devices(devices)
            return {}
        except json.JSONDecodeError as e:
            logger.error(f"JSON decode error in {self.storage_file}: {str(e)}")
            return {}
        except Exception as e:
            logger.error(f"Error loading devices: {str(e)}")
            return {}

    def _clean_old_devices(self, devices: Dict[str, Device]) -> Dict[str, Device]:
        now = datetime.now()
        filtered = {}
        for mac, device in devices.items():
            if device.status == "offline" and device.last_seen:
                try:
                    last_seen = datetime.fromisoformat(device.last_seen)
                    if now - last_seen <= self.offline_timeout:
                        filtered[mac] = device
                    else:
                        logger.info(f"Removed device {mac} (offline > 7 days)")
                except ValueError:
                    logger.warning(f"Invalid last_seen format for device {mac}")
            else:
                filtered[mac] = device
        return filtered

    def save_devices(self, devices: List[Device]) -> None:
        try:
            data = SubnetScanResult(devices=devices).model_dump()
            with open(self.storage_file, "w", encoding="utf-8") as f:
                json.dump(data, f, indent=2, ensure_ascii=False)
            logger.info(f"Saved {len(devices)} devices to {self.storage_file}")
        except Exception as e:
            logger.error(f"Error saving devices: {str(e)}")
            raise Exception(self.translations.gettext("Ошибка при сохранении устройств: {error}").format(error=str(e)))

class SubnetService:
    """Сервис для сканирования подсетей и управления устройствами."""
    def __init__(self, translations: Translations = Depends(get_translations())):
        self.interface = self._get_default_interface()
        self.network_scanner = NetworkScanner(self.interface)
        self.port_scanner = PortScanner(self.interface)
        self.device_info = DeviceInfoCollector()
        self.storage = DeviceStorage()
        if not hasattr(translations, 'gettext'):
            logger.warning("Translations object does not support gettext, using fallback")
            self.translations = Translations.load("utils/locales/en/LC_MESSAGES/services.mo")
        else:
            self.translations = translations
        logger.info(f"Initialized SubnetService with interface: {self.interface}")

    def _get_default_interface(self) -> str:
        try:
            gateways = netifaces.gateways()
            default_gateway = gateways.get("default", {}).get(netifaces.AF_INET)
            if default_gateway:
                iface = default_gateway[1]
                logger.info(f"Default interface from gateway: {iface}")
                return iface
            interfaces = netifaces.interfaces()
            for iface in interfaces:
                if iface != "lo":
                    addrs = netifaces.ifaddresses(iface)
                    if netifaces.AF_INET in addrs:
                        logger.info(f"Selected interface: {iface}")
                        return iface
            logger.warning("No suitable interface found, defaulting to eth0")
            return "eth0"
        except Exception as e:
            logger.warning(f"Failed to determine interface: {str(e)}, defaulting to eth0")
            return "eth0"

    def _get_default_subnet(self) -> str:
        """Автоматически определяет подсеть локального устройства."""
        try:
            interfaces = netifaces.interfaces()
            for iface in interfaces:
                if iface == "lo" or iface != self.interface:
                    continue
                addrs = netifaces.ifaddresses(iface)
                if netifaces.AF_INET in addrs:
                    ip_info = addrs[netifaces.AF_INET][0]
                    ip = ip_info["addr"]
                    netmask = ip_info["netmask"]
                    # Преобразуем маску из строки (например, "255.255.255.0") в CIDR
                    mask = ipaddress.ip_network(f"0.0.0.0/{netmask}", strict=False).prefixlen
                    network = ipaddress.ip_network(f"{ip}/{mask}", strict=False)
                    logger.info(f"Auto-detected subnet: {network} (IP: {ip}, Mask: {netmask} -> /{mask})")
                    return str(network)
            logger.warning("No suitable subnet found, defaulting to 0.0.0.0/0")
            return "0.0.0.0/0"
        except Exception as e:
            logger.error(f"Error determining default subnet: {str(e)}")
            return "0.0.0.0/0"

    def scan_subnet(self, subnet: Optional[str] = None) -> SubnetScanResult:
        """Сканирует указанную подсеть и возвращает результаты.

        Args:
            subnet (Optional[str]): Подсеть в формате CIDR (например, "10.1.1.0/24").
                Если None или пустая строка, определяется автоматически.

        Returns:
            SubnetScanResult: Объект с результатами сканирования, содержащий список
                устройств.
        """
        start_time = time.time()
        devices = []
        now = datetime.now().astimezone()
        formatted_now = now.strftime("%d-%m-%Y, %H:%M")
        try:
            # Определяем подсеть, если не указана или пустая
            if not subnet or subnet.strip() == "":
                subnet = self._get_default_subnet()
                if subnet == "0.0.0.0/0":
                    logger.warning("Default subnet is invalid, scan aborted")
                    return SubnetScanResult(devices=devices)

            saved_devices = self.storage.load_devices()

            local_device = self._get_local_device(subnet)
            if local_device:
                local_device.status = "online"
                local_device.last_seen = formatted_now
                devices.append(local_device)
                if local_device.mac:
                    saved_devices[local_device.mac] = local_device
                logger.info(f"Detected local device: {local_device.ip}, MAC: {local_device.mac}")

            logger.info(f"Scanning subnet: {subnet} with interface: {self.interface}")
            discovered_devices = self.network_scanner.scan(subnet)
            logger.info(f"Discovered devices: {len(discovered_devices)}")
            self.device_info.scan_nbtscan(subnet)

            def process_device(ip_mac: Tuple[str, str]) -> Optional[Device]:
                ip, mac = ip_mac
                if local_device and ip == local_device.ip:
                    return None

                existing_device = saved_devices.get(mac)
                if existing_device:
                    return Device(
                        ip=ip,
                        mac=mac,
                        hostname=self.device_info.get_hostname(ip) or existing_device.hostname,
                        vendor=self.device_info.get_vendor(mac),
                        open_ports=existing_device.open_ports,
                        status="online",
                        last_seen=formatted_now,
                        note=existing_device.note,
                    )
                vendor = self.device_info.get_vendor(mac)
                hostname = self.device_info.get_hostname(ip)
                return Device(
                    ip=ip,
                    mac=mac,
                    hostname=hostname,
                    vendor=vendor,
                    open_ports=[],
                    status="online",
                    last_seen=formatted_now,
                    note=None,
                )

            with ThreadPoolExecutor(max_workers=10) as executor:
                device_results = executor.map(process_device, discovered_devices)
                devices.extend([d for d in device_results if d is not None])

            active_macs = {d.mac for d in devices if d.mac}
            for mac, device in saved_devices.items():
                if mac not in active_macs:
                    device.status = "offline"
                    devices.append(device)

            devices.sort(key=lambda x: int(ipaddress.IPv4Address(x.ip)))

            for device in devices:
                if device.mac:
                    saved_devices[device.mac] = device
            self.storage.save_devices(list(saved_devices.values()))

            logger.info(
                f"Subnet scan {subnet} completed in {time.time() - start_time:.2f} seconds, "
                f"found {len(devices)} devices (active: {len(active_macs)})"
            )
            return SubnetScanResult(devices=devices)

        except Exception as e:
            logger.error(f"Error scanning subnet {subnet}: {str(e)}")
            return SubnetScanResult(devices=devices)

    def _get_local_device(self, subnet: str) -> Optional[Device]:
        now = datetime.now().astimezone()
        formatted_now = now.strftime("%d-%m-%Y, %H:%M")
        try:
            subnet_network = ipaddress.ip_network(subnet, strict=False)
            interfaces = netifaces.interfaces()
            for iface in interfaces:
                if iface == "lo":
                    continue
                addrs = netifaces.ifaddresses(iface)
                if netifaces.AF_INET in addrs and netifaces.AF_LINK in addrs:
                    ip = addrs[netifaces.AF_INET][0]["addr"]
                    if ipaddress.ip_address(ip) in subnet_network:
                        mac = addrs[netifaces.AF_LINK][0]["addr"]
                        vendor = self.device_info.get_vendor(mac)
                        hostname = self.device_info.get_hostname(ip)
                        logger.info(f"Local device detected: IP={ip}, MAC={mac}, Interface={iface}")
                        return Device(
                            ip=ip,
                            mac=mac,
                            hostname=hostname,
                            vendor=vendor,
                            open_ports=[],
                            status="online",
                            last_seen=formatted_now,
                            note=None,
                        )
            logger.warning(f"Local device not found in subnet {subnet}")
            return None
        except Exception as e:
            logger.warning(f"Failed to get local device: {str(e)}")
            return None

    def add_note(self, mac: str, note: str) -> Tuple[bool, Optional[str]]:
        try:
            saved_devices = self.storage.load_devices()
            if mac not in saved_devices:
                logger.warning(f"Device with MAC {mac} not found")
                return False, self.translations.gettext("Устройство с MAC {mac} не найдено").format(mac=mac)
            if saved_devices[mac].note is not None:
                logger.error(f"Note for device with MAC {mac} already exists")
                return False, self.translations.gettext("Заметка для устройства с MAC {mac} уже существует").format(mac=mac)
            saved_devices[mac].note = note
            self.storage.save_devices(list(saved_devices.values()))
            logger.info(f"Added note '{note}' for device with MAC {mac}")
            return True, None
        except Exception as e:
            logger.error(f"Error adding note for MAC {mac}: {str(e)}")
            return False, self.translations.gettext("Внутренняя ошибка сервера: {error}").format(error=str(e))

    def update_note(self, mac: str, note: str) -> Tuple[bool, Optional[str]]:
        try:
            saved_devices = self.storage.load_devices()
            if mac not in saved_devices:
                logger.warning(f"Device with MAC {mac} not found")
                return False, self.translations.gettext("Устройство с MAC {mac} не найдено").format(mac=mac)
            if saved_devices[mac].note is None:
                logger.error(f"Note for device with MAC {mac} does not exist")
                return False, self.translations.gettext("Заметка для устройства с MAC {mac} не существует").format(mac=mac)
            saved_devices[mac].note = note
            self.storage.save_devices(list(saved_devices.values()))
            logger.info(f"Updated note '{note}' for device with MAC {mac}")
            return True, None
        except Exception as e:
            logger.error(f"Error updating note for MAC {mac}: {str(e)}")
            return False, self.translations.gettext("Внутренняя ошибка сервера: {error}").format(error=str(e))

    def delete_note(self, mac: str) -> Tuple[bool, Optional[str]]:
        try:
            saved_devices = self.storage.load_devices()
            if mac not in saved_devices:
                logger.warning(f"Device with MAC {mac} not found")
                return False, self.translations.gettext("Устройство с MAC {mac} не найдено").format(mac=mac)
            if saved_devices[mac].note is None:
                logger.error(f"Note for device with MAC {mac} does not exist")
                return False, self.translations.gettext("Заметка для устройства с MAC {mac} не существует").format(mac=mac)
            saved_devices[mac].note = None
            self.storage.save_devices(list(saved_devices.values()))
            logger.info(f"Deleted note for device with MAC {mac}")
            return True, None
        except Exception as e:
            logger.error(f"Error deleting note for MAC {mac}: {str(e)}")
            return False, self.translations.gettext("Внутренняя ошибка сервера: {error}").format(error=str(e))