fix: 清 Pylance 类型检查提示(老板标注)

- client.py: 删未使用导入 TYPE_AUTH_OK/TYPE_DNS_RESP/TYPE_HTTP_RESP
- dnsmsg.py: flags 解包后未用 -> 补 QR=1 响应拒绝(符合'非 query 返回 None'语义)
- httpmsg.py: headers default_factory=list 推断 Unknown -> lambda: [] 显式类型
- smoke_channel.py: 删未使用导入 json/os/socket/FrameReader/pack_frame; cfg 显式 dict[str, object]
- analyze_capture.py: proto Counter() 无类型参数 -> Counter[int]

channel/client.py

@@ -18,12 +18,9 @@ from typing import Any
 from .proto import (
     FrameReader,
     TYPE_AUTH,
-    TYPE_AUTH_OK,
     TYPE_DNS_REQ,
-    TYPE_DNS_RESP,
     TYPE_ERROR,
     TYPE_HTTP_REQ,
-    TYPE_HTTP_RESP,
     TYPE_PING,
     TYPE_PONG,
     pack_frame,

channel/dnsmsg.py

@@ -19,6 +19,8 @@ def parse_qname(pkt: bytes) -> str | None:
     if len(pkt) < DNS_HEADER_LEN + 5:
         return None
     flags = struct.unpack("!H", pkt[2:4])[0]
+    if flags & 0x8000:  # QR=1 是响应报文, 非 query, 拒绝
+        return None
     qdcount = struct.unpack("!H", pkt[4:6])[0]
     if qdcount != 1:
         return None

channel/httpmsg.py

@@ -28,7 +28,7 @@ class HttpRequest:
     method: str
     path: str
     host: str
-    headers: list[tuple[str, str]] = field(default_factory=list)
+    headers: list[tuple[str, str]] = field(default_factory=lambda: [])
     body: bytes = b""
 
     def header(self, name: str) -> str | None:

scripts/smoke_channel.py

@@ -9,9 +9,6 @@ DNS 目标走公网 223.5.5.5, 学校网络不通时只验证帧链路(ERROR/超
 from __future__ import annotations
 
 import http.server
-import json
-import os
-import socket
 import subprocess
 import tempfile
 import threading
@@ -19,7 +16,6 @@ from pathlib import Path
 
 from channel.client import ChannelClient
 from channel.httpmsg import parse_request
-from channel.proto import FrameReader, pack_frame
 from channel.server import CloudConfig, CloudServer
 
 WORK = Path(tempfile.mkdtemp(prefix="smoke-channel-"))
@@ -64,7 +60,7 @@ def main() -> int:
     target = threading.Thread(target=_run_target, daemon=True)
     target.start()
 
-    cfg = {
+    cfg: dict[str, object] = {
         "cloud_side": {
             "listen_port": CLOUD_PORT,
             "token": TOKEN,

tools/analyze_capture.py

@@ -53,7 +53,7 @@ def main() -> int:
     bytes_total = sum(len(bytes(p)) for p in pkts)
     print(f"== 总览: {total} 包 / {bytes_total/1024:.1f} KB")
 
-    proto = Counter()
+    proto: Counter[int] = Counter()
     out_syn: list[tuple[int, int, int, bool, list[str], int, str]] = []
     cloud_bytes = 0
     cloud_pkts = 0