#!/bin/bash
# 能不能让 cloudflared 连更近的 Cloudflare 边缘？
#
# 现状：它连的是 198.41.x.x，日志显示落地在 lax01/sjc07（美西）。
#       从国内 4G 到美西，丢包 40%，握手经常超时。
#       如果能连香港/新加坡/日本，延迟和丢包都会好很多。
set -u

echo "===== 1. cloudflared 支持哪些边缘相关参数 ====="
cloudflared tunnel run --help 2>&1 | grep -iE 'edge|region|protocol|address' \
    | sed 's/^/  /'
echo
echo "  --- 顶层参数 ---"
cloudflared tunnel --help 2>&1 | grep -iE 'edge|region' | sed 's/^/  /'

echo
echo "===== 2. argotunnel 区域域名解析出哪些 IP ====="
for host in region1.v2.argotunnel.com region2.v2.argotunnel.com; do
    echo "  $host:"
    getent ahostsv4 "$host" 2>/dev/null | awk '{print $1}' | sort -u \
        | sed 's/^/    /'
done

echo
echo "===== 3. 到这些 IP 的 TCP 7844 延迟（各测 3 次）====="
for ip in $(getent ahostsv4 region1.v2.argotunnel.com 2>/dev/null \
            | awk '{print $1}' | sort -u | head -4); do
    total=0; ok=0
    for i in 1 2 3; do
        t=$(timeout 6 bash -c "exec 3<>/dev/tcp/$ip/7844" 2>/dev/null \
            && echo ok || echo fail)
        [ "$t" = "ok" ] && ok=$((ok+1))
    done
    printf "    %-18s 7844 通 %s/3\n" "$ip" "$ok"
done

echo
echo "===== 4. 这些 IP 的 ICMP 延迟 ====="
for ip in $(getent ahostsv4 region1.v2.argotunnel.com 2>/dev/null \
            | awk '{print $1}' | sort -u | head -3); do
    r=$(ping -c 3 -W 2 "$ip" 2>/dev/null | tail -1)
    printf "    %-18s %s\n" "$ip" "$r"
done

echo
echo "===== 5. 本机出口 IP / 运营商 ====="
curl -s --max-time 8 https://1.1.1.1/cdn-cgi/trace 2>/dev/null \
    | grep -E '^(ip|loc|colo)=' | sed 's/^/  /'
echo
echo "  到 Cloudflare 的落地 colo（上面 colo= 就是，如果是 LAX/SJC 说明被路由到美西）"

echo
echo "===== 6. 试几个 Cloudflare 常用 anycast IP 的 7844 ====="
for ip in 198.41.192.167 198.41.200.13 198.41.192.7 162.159.192.1 172.64.155.1; do
    ok=0
    for i in 1 2; do
        timeout 5 bash -c "exec 3<>/dev/tcp/$ip/7844" 2>/dev/null \
            && ok=$((ok+1))
    done
    printf "    %-18s 7844 通 %s/2\n" "$ip" "$ok"
done