#!/bin/bash
# 修 hosts：把 api.cloudflare.com 钉到**真正**的 IP。
#
# 之前我自己猜了个 104.16.132.229 —— 那是错的，它返回 Cloudflare 错误页
# （error code: 1034），不是 API。于是 cloudflared tunnel create 一直报
# unauthorized（它压根没打到 API）。
#
# 真实 IP 是用公共 DNS（1.1.1.1 / 8.8.8.8 / 223.5.5.5）查出来的：
#     104.19.192.174 / .175 / .176 / .177 / 104.19.192.29 / 104.19.193.29
set -u

HOSTS=/etc/hosts
MARK="# LanRemote: 钉住 Cloudflare API（网络会 DNS 劫持）"

echo "===== 1. 修之前 ====="
getent ahostsv4 api.cloudflare.com | head -1 | sed 's/^/  /'
C=$(timeout 12 curl -4 -s -o /tmp/old.txt -w '%{http_code}' \
    https://api.cloudflare.com/client/v4/user 2>/dev/null)
echo "  HTTP ${C:-超时}   响应: $(head -c 60 /tmp/old.txt)"

echo
echo "===== 2. 换成真实 IP ====="
cp -n "$HOSTS" "${HOSTS}.lanremote.bak2" 2>/dev/null || true
sed -i '/LanRemote.*Cloudflare API/d' "$HOSTS" 2>/dev/null || true
sed -i '/api\.cloudflare\.com/d' "$HOSTS" 2>/dev/null || true
sed -i '/^[[:space:]]*$/d' "$HOSTS" 2>/dev/null || true
echo "" >> "$HOSTS"

{
    echo "$MARK"
    # 公共 DNS 查出来的真实地址
    echo "104.19.192.174 api.cloudflare.com"
    echo "104.19.192.175 api.cloudflare.com"
    echo "104.19.192.176 api.cloudflare.com"
    echo "104.19.192.177 api.cloudflare.com"
    # 备用（实测这两个也能返回正常 API JSON）
    echo "104.17.0.1 api.cloudflare.com"
    echo "104.18.0.1 api.cloudflare.com"
} >> "$HOSTS"

tail -8 "$HOSTS" | sed 's/^/  /'

echo
echo "===== 3. 验证现在返回的是不是 API JSON ====="
sleep 1
getent ahostsv4 api.cloudflare.com | head -2 | sed 's/^/  /'
echo
for i in 1 2 3; do
    OUT=$(timeout 15 curl -4 -s -w '\n%{http_code}' \
          https://api.cloudflare.com/client/v4/user 2>/dev/null)
    CODE=$(echo "$OUT" | tail -1)
    FIRST=$(echo "$OUT" | head -c 110 | tr -d '\n')
    printf "  第 %d 次: HTTP %-4s  %s\n" "$i" "${CODE:-超时}" "$FIRST"
    sleep 1
done

echo
echo "===== 4. 判断 ====="
BODY=$(timeout 15 curl -4 -s https://api.cloudflare.com/client/v4/user 2>/dev/null)
if echo "$BODY" | grep -q '"success"'; then
    echo "  ✓ 现在返回的是真正的 API JSON —— 修好了！"
    echo "    cloudflared 应该能建隧道了"
else
    echo "  ✗ 还是不对：$(echo "$BODY" | head -c 80)"
fi

echo
echo "===== 5. cloudflared 再试一次 ====="
timeout 30 cloudflared tunnel list 2>&1 | head -4 | sed 's/^/  /'