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琚帶绔?- 淇 MTU 闂锛氬す MSS + 璺緞 MTU 鎺㈡祴锛堝叕缃戝彲鐢ㄧ巼 48% -> 100%锛?- 澶嶇敤 HTTP 杩炴帴锛堝厤鎺夋瘡娆℃柊寤?TLS 鐨?30% 鎻℃墜澶辫触锛?- 姣忓垎閽熷洖澶存壘灞€鍩熺綉锛岃嚜鍔ㄥ垏鍥炲揩 400 鍊嶇殑璺緞 - 鐢婚潰蹇冭烦甯э細闈欐鏃剁渷娴侀噺锛屽鎴风浠嶇煡閬撴祦鏄椿鐨?- 閿佸睆鏃剁粰鍑哄彲鎿嶄綔鐨勬彁绀? 鎵嬭〃绔?- 鍐呯疆 GTS Root R4 / GlobalSign Root CA锛屼慨 SSLHandshakeException - 杩炴帴閿欒缈昏瘧鎴愪汉璇濓紙璇佷功/鏃堕棿/瑙ｆ瀽/瓒呮椂鍒嗗埆鎻愮ず锛?- 缁忎腑杞繛涓婂悗鐢ㄦ湇鍔″櫒鎶ョ殑鍦板潃鍒锋柊宸查厤瀵硅褰?- 鏂板灞€鍩熺綉杩炴帴椤甸潰銆佹湇鍔″櫒寤惰繜妫€娴? 鏈嶅姟鍣ㄧ - 鏀寔 chunked 璇锋眰浣擄紙淇瘡 16 绉掍竴娆＄殑杩炴帴閿欎贡涓庡ぇ闈㈢Н 502锛?- 缃戠粶璋冧紭鑴氭湰 net-tune.sh锛堝紑鏈鸿嚜鍔ㄥ簲鐢級 - 绠＄悊椤碉細鎵归噺鍒犻櫎銆佺綉缁滀綋妫€銆佷笅杞藉尯 - 闅ч亾鏀?HTTP/2 + 鍙岃繛鎺? 鏂囨。 - 璁稿彲鍗忚 / 瀹夎鍓嶅繀璇?/ 瀹夎鍚庨』鐭ワ紙浣滆€咃細灏忛害瀛愶級
216 lines
7.9 KiB
Python
216 lines
7.9 KiB
Python
# -*- coding: utf-8 -*-
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"""验证中转能正确解析 chunked 请求体，且不再污染后续请求。
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背景（这次踩的坑）：
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Cloudflare 转发时可能用 Transfer-Encoding: chunked。
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中转原来只读 Content-Length，遇到 chunked 就返回 b"" 且**不读数据**，
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残留的 "0\r\n\r\n" 被当成下一个请求行 ->
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"Bad request syntax ('0')" -> 连接错位 -> 隧道大面积 502。
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这个测试直接用裸 socket 发 chunked，最能说明问题。
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"""
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from __future__ import annotations
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import json
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import os
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import shutil
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import socket
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import subprocess
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import sys
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import tempfile
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import time
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from pathlib import Path
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ROOT = Path(__file__).resolve().parent.parent
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PORT = 8130
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passed = 0
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failed = 0
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def check(name, ok, detail=""):
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global passed, failed
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if ok:
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passed += 1
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print(" [PASS] " + name)
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else:
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failed += 1
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print(" [FAIL] " + name + " " + str(detail))
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def raw_request(sock: socket.socket, payload: bytes) -> str:
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sock.sendall(payload)
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sock.settimeout(8)
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data = b""
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try:
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while b"\r\n\r\n" not in data:
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piece = sock.recv(4096)
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if not piece:
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break
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data += piece
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# 再读 body
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head, _, rest = data.partition(b"\r\n\r\n")
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length = 0
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for line in head.decode("utf-8", "replace").splitlines():
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if line.lower().startswith("content-length:"):
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length = int(line.split(":")[1].strip())
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while len(rest) < length:
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piece = sock.recv(4096)
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if not piece:
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break
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rest += piece
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except socket.timeout:
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pass
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# 注意：要把补读进来的 rest 拼回去。
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# 之前这里直接返回 data —— body 单独到达时（机器忙的时候就会）
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# 读到的 body 根本没被返回，断言全挂。
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return (head + b"\r\n\r\n" + rest).decode("utf-8", "replace")
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def chunked(body: bytes) -> bytes:
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"""把 body 编成 chunked 形式（模拟 Cloudflare 的转发）。"""
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out = b""
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step = 24
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for index in range(0, len(body), step):
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piece = body[index:index + step]
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out += f"{len(piece):x}\r\n".encode() + piece + b"\r\n"
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out += b"0\r\n\r\n"
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return out
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def main() -> int:
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work = Path(tempfile.mkdtemp(prefix="chunked_"))
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relay = None
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try:
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data = work / "d"
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data.mkdir(parents=True, exist_ok=True)
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env = dict(os.environ)
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env.update({"RELAY_PORT": str(PORT), "RELAY_BIND": "127.0.0.1",
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"RELAY_DATA": str(data),
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"PYTHONIOENCODING": "utf-8", "PYTHONUNBUFFERED": "1"})
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log_path = work / "relay.log"
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log_file = open(log_path, "wb")
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relay = subprocess.Popen(
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[sys.executable, "-u", str(ROOT / "relay" / "relay.py")], env=env,
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stdout=log_file, stderr=subprocess.STDOUT)
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up = False
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for _ in range(40):
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time.sleep(0.5)
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try:
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probe = socket.create_connection(("127.0.0.1", PORT), 2)
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probe.sendall(b"GET /v1/health HTTP/1.1\r\n"
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b"Host: 127.0.0.1\r\nConnection: close\r\n\r\n")
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if b"200" in probe.recv(200):
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up = True
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probe.close()
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break
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except Exception: # noqa: BLE001
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continue
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check("本地 relay 起来了", up)
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if not up:
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return 1
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body = json.dumps({"deviceId": "chunk-1", "code": "135791",
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"name": "分块机", "version": "1.4.0"},
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ensure_ascii=False).encode("utf-8")
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print()
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print("一、chunked 的 POST 能不能被正确解析")
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sock = socket.create_connection(("127.0.0.1", PORT), 8)
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head = (b"POST /v1/agent/register HTTP/1.1\r\n"
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b"Host: 127.0.0.1\r\n"
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b"Content-Type: application/json\r\n"
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b"Transfer-Encoding: chunked\r\n"
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b"User-Agent: LanRemote/1.4.0\r\n"
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b"Connection: keep-alive\r\n\r\n")
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reply = raw_request(sock, head + chunked(body))
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print(f" 响应: {reply.split(chr(13) + chr(10) + chr(13) + chr(10))[-1][:110]}")
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check("chunked POST 不是 400", "400" not in reply.split("\r\n")[0],
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reply.split("\r\n")[0])
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check("chunked POST 登记成功", '"ok": true' in reply or '"ok":true' in reply,
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reply[-160:])
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check("没有 Bad request syntax", "Bad request syntax" not in reply)
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check("响应里带回了配对码", "135791" in reply, reply[-160:])
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print()
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print("二、同一条连接上紧接着再发一个普通请求（验证没有错位）")
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normal = json.dumps({"deviceId": "chunk-2", "code": "246802",
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"name": "普通机", "version": "1.4.0"},
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ensure_ascii=False).encode("utf-8")
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head2 = (b"POST /v1/agent/register HTTP/1.1\r\n"
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b"Host: 127.0.0.1\r\n"
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b"Content-Type: application/json\r\n"
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+ ("Content-Length: %d\r\n" % len(normal)).encode()
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+ b"User-Agent: LanRemote/1.4.0\r\n"
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+ b"Connection: close\r\n\r\n")
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reply2 = raw_request(sock, head2 + normal)
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print(f" 响应: {reply2.split(chr(13) + chr(10) + chr(13) + chr(10))[-1][:110]}")
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check("第二个请求也成功（连接没被污染）",
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'"ok": true' in reply2 or '"ok":true' in reply2, reply2[-160:])
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check("第二个响应是 200", " 200 " in reply2.split("\r\n")[0],
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reply2.split("\r\n")[0])
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try:
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sock.close()
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except Exception: # noqa: BLE001
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pass
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print()
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print("三、relay 日志里不该有 Bad request syntax")
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time.sleep(0.6)
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log_file.flush()
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text = log_path.read_text(encoding="utf-8", errors="replace")
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bad = text.count("Bad request syntax")
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check("没有 Bad request syntax", bad == 0, bad)
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if bad:
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for line in text.splitlines():
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if "Bad request" in line:
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print(f" {line.strip()[:130]}")
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print()
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print("四、超大的 Content-Length 要被读掉、不能污染连接")
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sock2 = socket.create_connection(("127.0.0.1", PORT), 8)
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huge = (b"POST /v1/agent/register HTTP/1.1\r\n"
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b"Host: 127.0.0.1\r\n"
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b"Content-Type: application/json\r\n"
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b"Content-Length: 999999999\r\n"
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b"Connection: close\r\n\r\n")
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sock2.sendall(huge + b"x" * 100)
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try:
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sock2.recv(200)
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except Exception: # noqa: BLE001
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pass
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try:
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sock2.close()
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except Exception: # noqa: BLE001
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pass
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time.sleep(0.5)
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# 再来一个正常请求，确认服务还活着
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probe = socket.create_connection(("127.0.0.1", PORT), 5)
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probe.sendall(b"GET /v1/health HTTP/1.1\r\nHost: 127.0.0.1\r\n"
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b"Connection: close\r\n\r\n")
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alive = b"200" in probe.recv(300)
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probe.close()
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check("超大请求之后服务还正常", alive)
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print()
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print("=" * 58)
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print(f"通过 {passed} 项，失败 {failed} 项")
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return 0 if failed == 0 else 1
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finally:
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if relay is not None:
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try:
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relay.terminate()
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relay.wait(timeout=8)
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except Exception: # noqa: BLE001
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try:
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relay.kill()
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except Exception: # noqa: BLE001
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pass
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time.sleep(0.5)
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shutil.rmtree(work, ignore_errors=True)
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if __name__ == "__main__":
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sys.exit(main())
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