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# -*- coding: utf-8 -*-
"""把 DNS 劫持的检测和修复写进 install.sh。
为什么重要:
这条 4G 线路把 api.cloudflare.com 解析到 141.193.154.210
(运营商拦截设备,自签名证书)。cloudflared 下载登录证书必须走
这个域名,于是永远报 Failed to fetch resource ——
卡了我好几轮才查出来。
自动处理:
1. 解析 api.cloudflare.com
2. 如果拿到的不是 Cloudflare 的真实网段(104.16/104.17/172.67…)
-> 判定为 DNS 劫持
3. 在 /etc/hosts 里钉一个真实 IP
4. 验证修好了
"""
from __future__ import annotations
import sys
from pathlib import Path
INSTALL = Path(r"C:\Users\shu\Desktop\deepseekagent\LanRemote\relay"
r"\install.sh")
# 在"检查环境"那一步之后插入 DNS 检查
ANCHOR = '''echo " 内存: $(free -m | awk 'NR==2{print $2" MB 总量 / "$7" MB 可用"}')"'''
NEW = '''echo " 内存: $(free -m | awk 'NR==2{print $2" MB 总量 / "$7" MB 可用"}')"
# ---------- 0b. 检查 Cloudflare API 有没有被 DNS 劫持 ----------
# 踩过的坑:这条 4G 线路把 api.cloudflare.com 解析到运营商设备
# (141.193.154.210,自签名证书)。cloudflared 下载登录证书必须走这个域名,
# 于是永远报 Failed to fetch resource,具名隧道根本建不起来。
echo
echo "[0b] 检查 Cloudflare API"
CF_HOSTS=/etc/hosts
CF_MARK="# LanRemote: 钉住 Cloudflare API(网络会 DNS 劫持)"
resolve_cf() {
getent ahostsv4 api.cloudflare.com 2>/dev/null | awk 'NR==1{print $1}'
}
is_real_cf() {
case "$1" in
104.16.*|104.17.*|104.18.*|104.19.*|104.20.*|104.21.*|172.64.*|172.66.*|172.67.*|162.159.*|188.114.*)
return 0 ;;
*) return 1 ;;
esac
}
CF_IP=$(resolve_cf)
echo " api.cloudflare.com 现在解析到: ${CF_IP:-(解析不出来)}"
CF_CODE=$(timeout 12 curl -4 -s -o /dev/null -w '%{http_code}' \\
https://api.cloudflare.com/client/v4/user 2>/dev/null || echo 000)
echo " 实测 HTTP: ${CF_CODE}"
if is_real_cf "$CF_IP" && { [ "$CF_CODE" = "403" ] || [ "$CF_CODE" = "200" ]; }; then
echo " ✓ 正常(没被劫持)"
else
echo " ⚠ 检测到 Cloudflare API 被 DNS 劫持或不可达"
echo " 具名隧道需要访问它来下载证书,先修掉。"
cp -n "$CF_HOSTS" "${CF_HOSTS}.lanremote.bak" 2>/dev/null || true
sed -i "/$CF_MARK/d" "$CF_HOSTS" 2>/dev/null || true
sed -i '/api\\.cloudflare\\.com/d' "$CF_HOSTS" 2>/dev/null || true
{
echo ""
echo "$CF_MARK"
echo "104.16.132.229 api.cloudflare.com"
echo "104.16.133.229 api.cloudflare.com"
} >> "$CF_HOSTS"
sleep 1
CF_IP2=$(resolve_cf)
CF_CODE2=$(timeout 12 curl -4 -s -o /dev/null -w '%{http_code}' \\
https://api.cloudflare.com/client/v4/user 2>/dev/null || echo 000)
echo " 修完解析到: ${CF_IP2:-?} HTTP: ${CF_CODE2}"
if [ "$CF_CODE2" = "403" ] || [ "$CF_CODE2" = "200" ]; then
echo " ✓ 修好了"
else
echo " ✗ 还是不通 —— 具名隧道可能建不起来,"
echo " 但匿名隧道仍然可用(它走的是另一条链路)"
fi
fi'''
# 一并写进"具名隧道"那一段的说明
NAMED_ANCHOR = ''' 具名隧道不受匿名隧道限流,稳定性完全不是一个级别。'''
NAMED_NEW = ''' 具名隧道不受匿名隧道限流,稳定性完全不是一个级别。
注意:建具名隧道前,install.sh 会检查 api.cloudflare.com 有没有被
DNS 劫持(有些移动网络会把它解析到运营商设备)。如果被劫持,
会自动在 /etc/hosts 里钉真实 IP —— 否则 cloudflared 下载证书
会一直报 Failed to fetch resource。'''
def main() -> int:
text = INSTALL.read_text(encoding="utf-8")
ok = True
if "CF_MARK" in text:
print(" install.sh 已经加过 DNS 检查")
elif ANCHOR not in text:
print(" [失败] 找不到锚点")
ok = False
else:
text = text.replace(ANCHOR, NEW, 1)
print(" install.sh: 加了 DNS 劫持检测与修复")
if NAMED_ANCHOR in text and "DNS 劫持" not in text.split(NAMED_ANCHOR)[1][:200]:
text = text.replace(NAMED_ANCHOR, NAMED_NEW, 1)
print(" install.sh: 说明里补了 DNS 劫持提示")
INSTALL.write_text(text, encoding="utf-8")
# bash 语法检查(如果在 Windows 上没 bash,就只做个粗略的括号检查)
import subprocess
try:
result = subprocess.run(["bash", "-n", str(INSTALL)],
capture_output=True, text=True, timeout=30)
if result.returncode == 0:
print(" install.sh: bash 语法 OK")
else:
print(f" install.sh: bash 语法错误\n{result.stderr[:400]}")
ok = False
except FileNotFoundError:
opens = text.count("{")
closes = text.count("}")
print(f" (没有 bash 可检查)花括号 {opens} 开 / {closes} 闭")
return 0 if ok else 1
if __name__ == "__main__":
sys.exit(main())