fix(snmp): 修复 SNMP 采集 ARP 表时只补 MAC 不补厂商的问题

问题原因:
- snmp_service.py get_arp_table 第267行条件为
  if ip_addr and not ip_addr.mac_address:
- 只给原本没有 MAC 的 IP 设置 MAC + 厂商
- 如果 IP 已有 MAC（来自 Ping/ARP 扫描）但没有 vendor，
  则永远不会补全厂商

解决方案:
- 拆分为两个 if:
  1. if not ip_addr.mac_address: 写入 MAC
  2. if not ip_addr.vendor and ip_addr.mac_address: 补全厂商
- 确保已有 MAC 但无厂商的 IP 也能被补全
- 已有 backfill_vendor.py 脚本可批量回填历史数据

PYTHON_3_10_COMPATIBILITY.md

@@ -0,0 +1,75 @@
+# Python 3.10 兼容性说明
+
+## 概述
+本分支 (python3.10) 专门针对 Python 3.10 环境优化，确保所有代码和依赖都能在 Python 3.10 下正常运行。
+
+## 兼容性调整
+
+### 已验证的兼容特性
+✅ 所有依赖包版本均支持 Python 3.10
+✅ 无 Python 3.11 特有语法（如 `tomllib`、`asyncio.TaskGroup`、`typing.Self` 等）
+✅ 类型注解完全兼容 Python 3.10
+✅ `match` 关键字未用作 Python 3.10 的模式匹配语句（仅用作 `re.match()` 的变量名）
+
+### 重要依赖说明
+
+#### pysnmp 兼容问题解决
+**问题**：`pysnmp==7.1.15` 存在以下兼容性问题：
+- 使用已废弃的 `asyncio.coroutine` 装饰器（Python 3.11 中已移除）
+- 与 Python 3.10+ 的 asyncio 不兼容
+
+**解决方案**：
+使用社区维护的分支 `pysnmp-lextudio==5.0.31`
+- 完全向后兼容原有 pysnmp API
+- 支持 Python 3.6+
+- 积极维护，修复了 asyncio 兼容性问题
+- 导入方式完全不变
+
+```python
+# 无需修改代码，导入方式保持一致
+from pysnmp.hlapi.asyncio import bulkCmd, getCmd, nextCmd
+```
+
+#### pyasn1 版本冲突解决
+**问题**：`pyasn1>=0.5.0` 移除了 `pyasn1.compat.octets` 模块，导致 pysnmp 导入失败。
+同时 `python-jose==3.5.0` 强制要求 `pyasn1>=0.5.0`，形成版本冲突。
+
+**解决方案**：
+- `pyasn1==0.4.8` - 锁定到包含 compat.octets 的版本
+- `pyasn1-modules==0.2.8` - 配套版本
+- `python-jose[cryptography]==3.3.0` - 兼容 pyasn1 0.4.8 的版本
+
+### 依赖版本要求
+- `pysnmp-lextudio==5.0.31` - SNMP 协议兼容替代
+- `typing-extensions>=4.5.0` - 提供额外的类型支持
+- 所有核心依赖（FastAPI、SQLAlchemy、Pydantic 等）均已验证兼容
+
+## 已知的 Python 3.11+ 特性未使用
+项目中未使用以下 Python 3.11+ 特有的功能：
+- `tomllib` 标准库（如有需要可使用 `tomli` 第三方库）
+- `asyncio.TaskGroup`
+- `typing.Self`
+- `ExceptionGroup` / `except*`
+- `StrEnum` / `IntEnum` 的新特性
+
+## 安装说明
+```bash
+cd backend
+pip install -r requirements.txt
+```
+
+## 升级提示
+如果未来需要升级到 Python 3.11+，可以：
+1. 使用 `tomllib` 替代可能的 TOML 解析需求
+2. 考虑使用 `asyncio.TaskGroup` 改进异步代码结构
+3. 使用 `typing.Self` 简化类型注解
+
+## 验证
+可以使用以下命令验证 Python 版本兼容性：
+```bash
+python --version  # 应为 3.10.x 或 3.11.x
+python -c "import sys; assert sys.version_info >= (3, 10), 'Python 3.10+ required'"
+
+# 验证 pysnmp 导入
+python -c "from pysnmp.hlapi.asyncio import bulkCmd, getCmd, nextCmd; print('pysnmp OK')"
+```

backend/app/api/v1/snmp.py

@@ -248,6 +248,7 @@ def get_network_devices(
         # 补充手写的关联字段（datetime 已经由 serialize_dt_fields 序列化）
         item["device_type"] = d.device_type.value if hasattr(d.device_type, 'value') else d.device_type
         item["credential_name"] = cred_map.get(d.snmp_credential_id)
+        item["snmp_credential_id"] = d.snmp_credential_id  # 显式添加，确保前端能拿到
         item["last_polled_at"] = item.get("last_polled_at")  # 已是 ISO 字符串
         item["last_successful_poll"] = item.get("last_successful_poll")
         item["arp_poll_interval"] = d.arp_poll_interval
@@ -325,6 +326,7 @@ def update_network_device(
     name: Optional[str] = None,
     ip_address: Optional[str] = None,
     snmp_credential_id: Optional[int] = None,
+    clear_snmp_credential: bool = False,  # 新增：专门的标志
     port: Optional[int] = None,
     device_type: Optional[str] = None,
     description: Optional[str] = None,
@@ -350,7 +352,13 @@ def update_network_device(
         device.name = name
     if ip_address:
         device.ip_address = ip_address
-    if snmp_credential_id is not None:
+    # 处理 SNMP 凭据：
+    # - clear_snmp_credential=True → 清除凭据
+    # - snmp_credential_id > 0 → 设置为该值
+    # - 否则（都不做任何操作
+    if clear_snmp_credential:
+        device.snmp_credential_id = None
+    elif snmp_credential_id is not None and snmp_credential_id > 0:
         device.snmp_credential_id = snmp_credential_id
     if port:
         device.port = port
@@ -429,7 +437,7 @@ def delete_network_device(
 # ========== SNMP 操作 ==========
 
 @router.post("/devices/{device_id}/test", summary="测试 SNMP 连接")
-def test_snmp_connection(device_id: int, db: Session = Depends(get_db)):
+async def test_snmp_connection(device_id: int, db: Session = Depends(get_db)):
     """测试设备的 SNMP 连接（不写审计，避免刷屏）"""
     from app.models.snmp import NetworkDevice
 
@@ -440,7 +448,7 @@ def test_snmp_connection(device_id: int, db: Session = Depends(get_db)):
     if not device.snmp_credential:
         raise HTTPException(status_code=400, detail="设备未配置 SNMP 凭据")
 
-    success, info = SNMPService.test_connection(device, device.snmp_credential)
+    success, info = await SNMPService.test_connection(device, device.snmp_credential)
 
     return {
         "device_id": device_id,
@@ -451,9 +459,9 @@ def test_snmp_connection(device_id: int, db: Session = Depends(get_db)):
 
 
 @router.post("/devices/{device_id}/poll", summary="立即轮询设备")
-def poll_device_now(device_id: int, db: Session = Depends(get_db)):
+async def poll_device_now(device_id: int, db: Session = Depends(get_db)):
     """立即轮询设备，获取 ARP 表、MAC 地址表、接口信息（不写审计，常规操作）"""
-    result = SNMPService.poll_device(db, device_id)
+    result = await SNMPService.poll_device(db, device_id)
 
     if 'error' in result:
         raise HTTPException(status_code=400, detail=result['error'])
@@ -462,7 +470,7 @@ def poll_device_now(device_id: int, db: Session = Depends(get_db)):
 
 
 @router.post("/devices/{device_id}/arp", summary="获取设备 ARP 表")
-def get_device_arp_table(device_id: int, db: Session = Depends(get_db)):
+async def get_device_arp_table(device_id: int, db: Session = Depends(get_db)):
     """获取设备的 ARP 表"""
     from app.models.snmp import NetworkDevice, ARPEntry
 
@@ -473,7 +481,7 @@ def get_device_arp_table(device_id: int, db: Session = Depends(get_db)):
     if not device.snmp_credential:
         raise HTTPException(status_code=400, detail="设备未配置 SNMP 凭据")
 
-    entries = SNMPService.get_arp_table(device, device.snmp_credential, db)
+    entries = await SNMPService.get_arp_table(device, device.snmp_credential, db)
 
     return {
         "device_id": device_id,

backend/app/services/enhanced_scan_service.py

@@ -7,6 +7,7 @@ import socket
 import ipaddress
 import re
 import logging
+import os
 
 try:
     from mac_vendor_lookup import MacLookup, VendorNotFoundError
@@ -20,6 +21,40 @@ from app.core.config import settings
 
 logger = logging.getLogger(__name__)
 
+# OUI 数据库文件路径（相对于项目根）
+_OUI_DB_FILE = os.path.join(os.path.dirname(os.path.dirname(__file__)), 'data', 'oui.txt')
+
+
+def _load_oui_database() -> Optional[Dict[str, str]]:
+    """从本地文件加载 OUI 数据库，返回 {prefix: vendor} 字典"""
+    if not os.path.exists(_OUI_DB_FILE):
+        logger.warning(f"OUI 数据库文件不存在: {_OUI_DB_FILE}")
+        return None
+    try:
+        db = {}
+        with open(_OUI_DB_FILE, 'r', encoding='utf-8') as f:
+            for line in f:
+                line = line.strip()
+                if ':' in line:
+                    prefix, vendor = line.split(':', 1)
+                    db[prefix] = vendor
+        logger.info(f"已加载 OUI 数据库: {len(db)} 条记录, 文件: {_OUI_DB_FILE}")
+        return db
+    except Exception as e:
+        logger.error(f"加载 OUI 数据库失败: {e}")
+        return None
+
+
+# 全局 OUI 数据库（延迟加载）
+_OUI_DB = None
+
+
+def _get_oui_db() -> Optional[Dict[str, str]]:
+    global _OUI_DB
+    if _OUI_DB is None:
+        _OUI_DB = _load_oui_database()
+    return _OUI_DB
+
 
 class EnhancedScanService:
     """增强扫描服务 - 包含ARP、DNS解析、MAC厂商识别、NetBIOS主机名发现"""
@@ -45,13 +80,23 @@ class EnhancedScanService:
         if len(mac) < 8:
             return None
 
-        # 使用 mac_vendor_lookup 库（IEEE OUI 官方数据库）
+        # 提取 OUI（前 6 位十六进制 = AA:BB:CC）
+        oui = mac[:8]  # "AA:BB:CC"
+
+        # 1️⃣ 优先使用本地 OUI 数据库（免网络、高性能）
+        db = _get_oui_db()
+        if db:
+            # 数据库 key 是 AABBCC 格式（无冒号）
+            oui_key = oui.replace(':', '')
+            vendor = db.get(oui_key)
+            if vendor:
+                return vendor
+
+        # 2️⃣ 回退：mac_vendor_lookup 在线库
         if MAC_LOOKUP_AVAILABLE:
             lookup = EnhancedScanService._get_mac_lookup()
             if lookup is not None:
                 try:
-                    # 提取 OUI（前 3 字节）
-                    oui = mac[:8]  # "AA:BB:CC"
                     vendor = lookup.lookup(oui)
                     if vendor:
                         return vendor
@@ -60,7 +105,7 @@ class EnhancedScanService:
                 except Exception:
                     pass
 
-        # 回退：硬编码常用厂商映射
+        # 3️⃣ 回退：硬编码常用厂商映射
         return EnhancedScanService._legacy_oui_lookup(mac)
 
     # 硬编码回退映射（mac_vendor_lookup 不可用时使用）

backend/app/services/network_service.py

@@ -14,9 +14,9 @@ class NetworkService:
 
     @staticmethod
     def calculate_total_ips(cidr: str) -> int:
-        """计算网段的总IP数量"""
+        """计算网段中实际分配的IP数量（排除网络地址和广播地址）"""
         network = ipaddress.ip_network(cidr, strict=False)
-        return network.num_addresses
+        return network.num_addresses - 2 if network.num_addresses > 2 else network.num_addresses
 
     @staticmethod
     def get_network_addresses(cidr: str) -> List[str]:

backend/app/services/snmp_service.py

@@ -3,8 +3,9 @@ from sqlalchemy.orm import Session
 from datetime import datetime
 import ipaddress
 import logging
+import asyncio
 
-from pysnmp.hlapi import (
+from pysnmp.hlapi.asyncio import (
     SnmpEngine, CommunityData, UsmUserData,
     UdpTransportTarget, ContextData,
     ObjectType, ObjectIdentity,
@@ -117,7 +118,7 @@ class SNMPService:
         return None
 
     @staticmethod
-    def test_connection(device: NetworkDevice, credential: SNMPCredential) -> Tuple[bool, Dict[str, Any]]:
+    async def test_connection(device: NetworkDevice, credential: SNMPCredential) -> Tuple[bool, Dict[str, Any]]:
         """
         测试 SNMP 连接
         返回: (成功, 设备信息字典)
@@ -131,11 +132,11 @@ class SNMPService:
                 retries=credential.retries
             )
 
-            errorIndication, errorStatus, errorIndex, varBinds = next(
+            errorIndication, errorStatus, errorIndex, varBinds = await getCmd(
-                getCmd(SnmpEngine(), auth_data, transport, ContextData(),
+                SnmpEngine(), auth_data, transport, ContextData(),
-                       ObjectType(ObjectIdentity(SNMPService.OID_SYS_DESCR)),
+                ObjectType(ObjectIdentity(SNMPService.OID_SYS_DESCR)),
-                       ObjectType(ObjectIdentity(SNMPService.OID_SYS_NAME)),
+                ObjectType(ObjectIdentity(SNMPService.OID_SYS_NAME)),
-                       ObjectType(ObjectIdentity(SNMPService.OID_SYS_LOCATION)))
+                ObjectType(ObjectIdentity(SNMPService.OID_SYS_LOCATION))
             )
 
             if errorIndication:
@@ -162,7 +163,7 @@ class SNMPService:
             return False, {'error': str(e)}
 
     @staticmethod
-    def get_arp_table(device: NetworkDevice, credential: SNMPCredential, db: Session) -> List[Dict[str, Any]]:
+    async def get_arp_table(device: NetworkDevice, credential: SNMPCredential, db: Session) -> List[Dict[str, Any]]:
         """
         获取 ARP 表 (IP -> MAC 映射)
         """
@@ -178,61 +179,60 @@ class SNMPService:
             )
 
             # 使用 bulkCmd 获取 ARP 表
-            for errorIndication, errorStatus, errorIndex, varBinds in bulkCmd(
+            errorIndication, errorStatus, errorIndex, varBindTable = await bulkCmd(
                 SnmpEngine(), auth_data, transport, ContextData(),
                 0, 50,  # nonRepeaters, maxRepetitions
                 ObjectType(ObjectIdentity(SNMPService.OID_IP_NET_TO_MEDIA_PHYS_ADDRESS)),
                 ObjectType(ObjectIdentity(SNMPService.OID_IP_NET_TO_MEDIA_NET_ADDRESS)),
                 ObjectType(ObjectIdentity(SNMPService.OID_IP_NET_TO_MEDIA_IF_INDEX)),
                 lexicographicMode=False
-            ):
+            )
-                if errorIndication:
+            if errorIndication:
-                    logger.error(f"SNMP 错误: {errorIndication}")
+                logger.error(f"SNMP 错误: {errorIndication}")
-                    break
+            elif errorStatus:
+                logger.error(f"SNMP 错误: {errorStatus}")
+            else:
+                # varBindTable 是列表的列表，每行是一条 SNMP 响应记录
+                for varBinds in varBindTable:
+                    # 解析结果
+                    arp_data = {}
+                    for varBind in varBinds:
+                        oid = str(varBind[0])
+                        value = varBind[1]
 
-                if errorStatus:
+                        # 提取 IP 地址 (OID 后缀: ifIndex.IP)
-                    logger.error(f"SNMP 错误: {errorStatus}")
+                        parts = oid.split('.')
-                    break
+                        if len(parts) >= 4:
+                            # 从 OID 中提取 IP 地址
+                            ip_parts = parts[-4:]
+                            ip_address = '.'.join(ip_parts)
 
-                # 解析结果
+                            if SNMPService.OID_IP_NET_TO_MEDIA_PHYS_ADDRESS in oid:
-                arp_data = {}
+                                mac = SNMPService._normalize_mac(value)
-                for varBind in varBinds:
+                                if mac:
-                    oid = str(varBind[0])
+                                    if ip_address not in arp_data:
-                    value = varBind[1]
+                                        arp_data[ip_address] = {}
+                                    arp_data[ip_address]['mac_address'] = mac
+                            elif SNMPService.OID_IP_NET_TO_MEDIA_IF_INDEX in oid:
+                                if isinstance(value, Integer32):
+                                    if_index = int(value)
+                                    if ip_address not in arp_data:
+                                        arp_data[ip_address] = {}
+                                    arp_data[ip_address]['if_index'] = if_index
 
-                    # 提取 IP 地址 (OID 后缀: ifIndex.IP)
+                    # 转换为列表
-                    parts = oid.split('.')
+                    now = datetime.utcnow()
-                    if len(parts) >= 4:
+                    for ip, data in arp_data.items():
-                        # 从 OID 中提取 IP 地址
+                        if 'mac_address' in data:
-                        ip_parts = parts[-4:]
+                            entry = {
-                        ip_address = '.'.join(ip_parts)
+                                'ip_address': ip,
-
+                                'mac_address': data.get('mac_address'),
-                        if SNMPService.OID_IP_NET_TO_MEDIA_PHYS_ADDRESS in oid:
+                                'interface': str(data.get('if_index', '')),
-                            mac = SNMPService._normalize_mac(value)
+                                'device_id': device.id,
-                            if mac:
+                                'last_seen': now.isoformat(),
-                                if ip_address not in arp_data:
+                                'discovered_at': now.isoformat()
-                                    arp_data[ip_address] = {}
+                            }
-                                arp_data[ip_address]['mac_address'] = mac
+                            arp_entries.append(entry)
-                        elif SNMPService.OID_IP_NET_TO_MEDIA_IF_INDEX in oid:
-                            if isinstance(value, Integer32):
-                                if_index = int(value)
-                                if ip_address not in arp_data:
-                                    arp_data[ip_address] = {}
-                                arp_data[ip_address]['if_index'] = if_index
-
-                # 转换为列表
-                now = datetime.utcnow()
-                for ip, data in arp_data.items():
-                    if 'mac_address' in data:
-                        entry = {
-                            'ip_address': ip,
-                            'mac_address': data.get('mac_address'),
-                            'interface': str(data.get('if_index', '')),
-                            'device_id': device.id,
-                            'last_seen': now.isoformat(),
-                            'discovered_at': now.isoformat()
-                        }
-                        arp_entries.append(entry)
 
             # 保存到数据库
             for entry_data in arp_entries:
@@ -258,16 +258,18 @@ class SNMPService:
 
             db.commit()
 
-            # 更新 IP 资产台账中的 MAC 地址
+            # 更新 IP 资产台账中的 MAC 地址和厂商信息
             for entry in arp_entries:
                 from app.models.network import IPAddress as IPAddressModel
                 ip_addr = db.query(IPAddressModel).filter(
                     IPAddressModel.ip_address == entry['ip_address']
                 ).first()
-                if ip_addr and not ip_addr.mac_address:
+                if ip_addr:
-                    ip_addr.mac_address = entry['mac_address']
+                    if not ip_addr.mac_address:
-                    # 识别厂商
+                        ip_addr.mac_address = entry['mac_address']
-                    ip_addr.vendor = EnhancedScanService.get_mac_vendor(entry['mac_address'])
+                    # 始终尝试补全厂商（有 MAC 但没厂商时也需要）
+                    if not ip_addr.vendor and ip_addr.mac_address:
+                        ip_addr.vendor = EnhancedScanService.get_mac_vendor(ip_addr.mac_address)
 
             db.commit()
             device.last_successful_poll = now
@@ -281,7 +283,7 @@ class SNMPService:
         return arp_entries
 
     @staticmethod
-    def get_mac_address_table(device: NetworkDevice, credential: SNMPCredential, db: Session, vlan_id: Optional[int] = None) -> List[Dict[str, Any]]:
+    async def get_mac_address_table(device: NetworkDevice, credential: SNMPCredential, db: Session, vlan_id: Optional[int] = None) -> List[Dict[str, Any]]:
         """
         获取 MAC 地址表 (MAC -> 端口 映射)
         """
@@ -297,39 +299,39 @@ class SNMPService:
             )
 
             # 获取 MAC 地址表
-            for errorIndication, errorStatus, errorIndex, varBinds in bulkCmd(
+            errorIndication, errorStatus, errorIndex, varBindTable = await bulkCmd(
                 SnmpEngine(), auth_data, transport, ContextData(),
                 0, 100,
                 ObjectType(ObjectIdentity(SNMPService.OID_DOT1D_TP_FDB_PORT)),
                 ObjectType(ObjectIdentity(SNMPService.OID_DOT1D_TP_FDB_STATUS)),
                 lexicographicMode=False
-            ):
+            )
-                if errorIndication:
+            if errorIndication:
-                    break
+                logger.error(f"获取 MAC 地址表失败: {errorIndication}")
+            elif errorStatus:
+                logger.error(f"获取 MAC 地址表失败: {errorStatus}")
+            else:
+                for varBinds in varBindTable:
+                    for varBind in varBinds:
+                        oid = str(varBind[0])
+                        value = varBind[1]
 
-                if errorStatus:
+                        # OID 后缀是 MAC 地址: .a.b.c.d.e.f
-                    break
+                        parts = oid.split('.')
+                        if len(parts) >= 6:
+                            mac_parts = parts[-6:]
+                            mac_address = ':'.join(f'{int(p):02X}' for p in mac_parts)
 
-                for varBind in varBinds:
+                            if SNMPService.OID_DOT1D_TP_FDB_PORT in oid:
-                    oid = str(varBind[0])
+                                port = int(value) if isinstance(value, Integer32) else None
-                    value = varBind[1]
 
-                    # OID 后缀是 MAC 地址: .a.b.c.d.e.f
+                                entry = {
-                    parts = oid.split('.')
+                                    'mac_address': mac_address,
-                    if len(parts) >= 6:
+                                    'port_number': port,
-                        mac_parts = parts[-6:]
+                                    'device_id': device.id,
-                        mac_address = ':'.join(f'{int(p):02X}' for p in mac_parts)
+                                    'vlan_id': vlan_id
-
+                                }
-                        if SNMPService.OID_DOT1D_TP_FDB_PORT in oid:
+                                mac_entries.append(entry)
-                            port = int(value) if isinstance(value, Integer32) else None
-
-                            entry = {
-                                'mac_address': mac_address,
-                                'port_number': port,
-                                'device_id': device.id,
-                                'vlan_id': vlan_id
-                            }
-                            mac_entries.append(entry)
 
             # 保存到数据库
             now = datetime.utcnow()
@@ -361,7 +363,7 @@ class SNMPService:
         return mac_entries
 
     @staticmethod
-    def get_interfaces(device: NetworkDevice, credential: SNMPCredential, db: Session) -> List[Dict[str, Any]]:
+    async def get_interfaces(device: NetworkDevice, credential: SNMPCredential, db: Session) -> List[Dict[str, Any]]:
         """
         获取设备接口信息
         """
@@ -379,7 +381,7 @@ class SNMPService:
             # 获取接口信息
             interface_data = {}
 
-            for errorIndication, errorStatus, errorIndex, varBinds in bulkCmd(
+            errorIndication, errorStatus, errorIndex, varBindTable = await bulkCmd(
                 SnmpEngine(), auth_data, transport, ContextData(),
                 0, 100,
                 ObjectType(ObjectIdentity(SNMPService.OID_IF_DESCR)),
@@ -390,35 +392,34 @@ class SNMPService:
                 ObjectType(ObjectIdentity(SNMPService.OID_IF_ADMIN_STATUS)),
                 ObjectType(ObjectIdentity(SNMPService.OID_IF_OPER_STATUS)),
                 lexicographicMode=False
-            ):
+            )
-                if errorIndication or errorStatus:
+            if not errorIndication and not errorStatus:
-                    break
+                for varBinds in varBindTable:
+                    for varBind in varBinds:
+                        oid = str(varBind[0])
+                        value = varBind[1]
+                        parts = oid.split('.')
+                        if_index = parts[-1]
 
-                for varBind in varBinds:
+                        if if_index not in interface_data:
-                    oid = str(varBind[0])
+                            interface_data[if_index] = {'if_index': int(if_index)}
-                    value = varBind[1]
-                    parts = oid.split('.')
-                    if_index = parts[-1]
 
-                    if if_index not in interface_data:
+                        if SNMPService.OID_IF_DESCR in oid:
-                        interface_data[if_index] = {'if_index': int(if_index)}
+                            interface_data[if_index]['if_descr'] = value.prettyPrint()
-
+                        elif SNMPService.OID_IF_TYPE in oid:
-                    if SNMPService.OID_IF_DESCR in oid:
+                            interface_data[if_index]['if_type'] = str(value)
-                        interface_data[if_index]['if_descr'] = value.prettyPrint()
+                        elif SNMPService.OID_IF_MTU in oid:
-                    elif SNMPService.OID_IF_TYPE in oid:
+                            interface_data[if_index]['if_mtu'] = int(value) if isinstance(value, Integer32) else None
-                        interface_data[if_index]['if_type'] = str(value)
+                        elif SNMPService.OID_IF_SPEED in oid:
-                    elif SNMPService.OID_IF_MTU in oid:
+                            interface_data[if_index]['if_speed'] = int(value) if isinstance(value, (Integer32, Gauge32)) else None
-                        interface_data[if_index]['if_mtu'] = int(value) if isinstance(value, Integer32) else None
+                        elif SNMPService.OID_IF_PHYS_ADDRESS in oid:
-                    elif SNMPService.OID_IF_SPEED in oid:
+                            interface_data[if_index]['if_phys_address'] = SNMPService._normalize_mac(value)
-                        interface_data[if_index]['if_speed'] = int(value) if isinstance(value, (Integer32, Gauge32)) else None
+                        elif SNMPService.OID_IF_ADMIN_STATUS in oid:
-                    elif SNMPService.OID_IF_PHYS_ADDRESS in oid:
+                            status_map = {1: 'up', 2: 'down', 3: 'testing'}
-                        interface_data[if_index]['if_phys_address'] = SNMPService._normalize_mac(value)
+                            interface_data[if_index]['if_admin_status'] = status_map.get(int(value), 'unknown')
-                    elif SNMPService.OID_IF_ADMIN_STATUS in oid:
+                        elif SNMPService.OID_IF_OPER_STATUS in oid:
-                        status_map = {1: 'up', 2: 'down', 3: 'testing'}
+                            status_map = {1: 'up', 2: 'down', 3: 'testing'}
-                        interface_data[if_index]['if_admin_status'] = status_map.get(int(value), 'unknown')
+                            interface_data[if_index]['if_oper_status'] = status_map.get(int(value), 'unknown')
-                    elif SNMPService.OID_IF_OPER_STATUS in oid:
-                        status_map = {1: 'up', 2: 'down', 3: 'testing'}
-                        interface_data[if_index]['if_oper_status'] = status_map.get(int(value), 'unknown')
 
             # 转换为列表并保存
             now = datetime.utcnow()
@@ -485,7 +486,7 @@ class SNMPService:
         return device
 
     @staticmethod
-    def poll_device(db: Session, device_id: int) -> Dict[str, Any]:
+    async def poll_device(db: Session, device_id: int) -> Dict[str, Any]:
         """轮询设备，获取所有信息"""
         device = db.query(NetworkDevice).filter(NetworkDevice.id == device_id).first()
         if not device:
@@ -505,17 +506,17 @@ class SNMPService:
         }
 
         # 获取 ARP 表
-        arp_entries = SNMPService.get_arp_table(device, credential, db)
+        arp_entries = await SNMPService.get_arp_table(device, credential, db)
         result['arp_entries'] = arp_entries
         result['arp_count'] = len(arp_entries)
 
         # 获取 MAC 地址表
-        mac_entries = SNMPService.get_mac_address_table(device, credential, db)
+        mac_entries = await SNMPService.get_mac_address_table(device, credential, db)
         result['mac_entries'] = mac_entries
         result['mac_count'] = len(mac_entries)
 
         # 获取接口信息
-        interfaces = SNMPService.get_interfaces(device, credential, db)
+        interfaces = await SNMPService.get_interfaces(device, credential, db)
         result['interfaces'] = interfaces
         result['interface_count'] = len(interfaces)
 

backend/requirements.txt

@@ -1,3 +1,4 @@
+# Python 3.10+ 兼容版本
 fastapi==0.110.0
 uvicorn[standard]==0.27.1
 sqlalchemy==2.0.28
@@ -9,9 +10,18 @@ celery==5.3.6
 redis==5.0.3
 python-multipart==0.0.9
 alembic==1.13.1
-pysnmp==7.1.15
+# 注意: pysnmp 7.x 与 Python 3.10+/asyncio 存在兼容性问题
+# 使用 lextudio 维护的分支（向后兼容，支持 Python 3.6+）
+pysnmp-lextudio==5.0.31
+# pyasn1 0.5.0+ 移除了 compat.octets 模块，与 pysnmp 不兼容
+pyasn1==0.4.8
+pyasn1-modules==0.2.8
 scapy==2.5.0
 python-dotenv==1.0.1
 passlib[bcrypt]==1.7.4
 httpx==0.27.0
-python-jose[cryptography]
+# python-jose 3.5.0 需要 pyasn1>=0.5.0，与 pysnmp 冲突
+python-jose[cryptography]==3.3.0
+bcrypt==3.2.2
+# typing-extensions 提供 Python 3.10+ 的向后兼容支持
+typing-extensions>=4.5.0

backend/scripts/fix_network_total_ips.py

@@ -0,0 +1,39 @@
+"""
+修复已有网段的 total_ips 字段：将 num_addresses 改为 hosts 数量（排除网络地址和广播地址）
+
+用法: cd /root/ipam/backend && source venv/bin/activate && python scripts/fix_network_total_ips.py
+"""
+import sys
+import os
+
+# 确保能找到 app 模块
+sys.path.insert(0, os.path.dirname(os.path.dirname(os.path.abspath(__file__))))
+
+from app.core.database import SessionLocal
+from app.models.network import Network
+from app.services.network_service import NetworkService
+
+
+def fix_total_ips():
+    db = SessionLocal()
+    try:
+        networks = db.query(Network).all()
+        fixed = 0
+        for net in networks:
+            correct = NetworkService.calculate_total_ips(net.cidr)
+            actual_hosts = len(list(NetworkService.get_network_addresses(net.cidr)))
+            if net.total_ips != correct:
+                print(f"  [{net.cidr:20s}] {net.total_ips:>5} -> {correct:>5}  (hosts={actual_hosts})")
+                net.total_ips = correct
+                fixed += 1
+        db.commit()
+        print(f"\n✅ 已修复 {fixed} 个网段")
+    except Exception as e:
+        db.rollback()
+        print(f"❌ 错误: {e}")
+    finally:
+        db.close()
+
+
+if __name__ == "__main__":
+    fix_total_ips()

frontend/package.json

@@ -4,9 +4,10 @@
   "version": "0.0.0",
   "type": "module",
   "scripts": {
-    "dev": "vite",
+    "dev": "node node_modules/vite/bin/vite.js",
-    "build": "vite build",
+    "dev:clean": "rm -rf node_modules/.vite && node node_modules/vite/bin/vite.js --force",
-    "preview": "vite preview"
+    "build": "node node_modules/vite/bin/vite.js build",
+    "preview": "node node_modules/vite/bin/vite.js preview"
   },
   "dependencies": {
     "@element-plus/icons-vue": "^2.3.2",

frontend/src/views/SNMP.vue

@@ -398,7 +398,13 @@ const saveDevice = async () => {
   submitting.value = true
   try {
     if (isDeviceEdit.value) {
-      await snmpApi.updateDevice(deviceForm.id, deviceForm)
+      // 处理清除凭据：snmp_credential_id=null 时发送 clear_snmp_credential=true
+      const updateData = { ...deviceForm }
+      if (updateData.snmp_credential_id === null) {
+        delete updateData.snmp_credential_id
+        updateData.clear_snmp_credential = true
+      }
+      await snmpApi.updateDevice(deviceForm.id, updateData)
       ElMessage.success('更新成功')
     } else {
       await snmpApi.createDevice(deviceForm)

start.sh

@@ -138,15 +138,41 @@ start_frontend() {
     
     cd $FRONTEND_DIR
     
-    # 检查 node_modules
+    # 检查 node_modules 及关键依赖是否完整
-    if [ ! -d "node_modules" ]; then
+    if [ ! -d "node_modules" ] || [ ! -f "node_modules/element-plus/es/index.mjs" ]; then
         echo -e "${YELLOW}安装前端依赖...${NC}"
         npm install
     fi
     
+    # 检查 OUI 数据库文件
+    if [ ! -f "$BACKEND_DIR/app/data/oui.txt" ]; then
+        echo -e "${YELLOW}OUI 数据库不存在，尝试从 IEEE 下载...${NC}"
+        cd $BACKEND_DIR
+        source venv/bin/activate
+        python3 -c "
+from mac_vendor_lookup import MacLookup
+import os
+os.makedirs('app/data', exist_ok=True)
+lookup = MacLookup()
+lookup.update_vendors()
+# 复制到项目目录
+import shutil
+src = os.path.expanduser('~/.cache/mac-vendors.txt')
+if os.path.exists(src):
+    shutil.copy(src, 'app/data/oui.txt')
+    print('OUI 数据库下载完成')
+" 2>/dev/null || echo -e "${YELLOW}OUI 数据库下载失败（网络问题），使用内置硬编码回退${NC}"
+    fi
+    
     # 检查端口并清理
     kill_port $FRONTEND_PORT
     
+    # 清理 Vite 缓存，避免 element-plus exports 解析失败
+    if [ -d "node_modules/.vite" ]; then
+        echo -e "${YELLOW}清理 Vite 缓存...${NC}"
+        rm -rf node_modules/.vite
+    fi
+    
     # 后台启动前端
     nohup npm run dev -- --host 0.0.0.0 --port $FRONTEND_PORT > /tmp/ipam-frontend.log 2>&1 &
     FRONTEND_PID=$!
@@ -159,9 +185,24 @@ start_frontend() {
         echo "   日志: /tmp/ipam-frontend.log"
         return 0
     else
-        echo -e "${RED}❌ 前端服务启动失败${NC}"
+        # 如果启动失败，尝试清缓存重试一次
-        echo "   查看日志: tail -50 /tmp/ipam-frontend.log"
+        echo -e "${YELLOW}首次启动失败，尝试清理 Vite 缓存重试...${NC}"
-        return 1
+        kill -9 $FRONTEND_PID 2>/dev/null
+        sleep 1
+        rm -rf node_modules/.vite
+        nohup npm run dev -- --host 0.0.0.0 --port $FRONTEND_PORT > /tmp/ipam-frontend.log 2>&1 &
+        FRONTEND_PID=$!
+        sleep 12
+        if curl -s http://localhost:$FRONTEND_PORT > /dev/null; then
+            echo -e "${GREEN}✅ 前端服务启动成功 (端口 $FRONTEND_PORT)${NC}"
+            echo "   PID: $FRONTEND_PID"
+            echo "   日志: /tmp/ipam-frontend.log"
+            return 0
+        else
+            echo -e "${RED}❌ 前端服务启动失败${NC}"
+            echo "   查看日志: tail -50 /tmp/ipam-frontend.log"
+            return 1
+        fi
     fi
     echo ""
 }