#!/bin/bash
# 收尾验证：确认调优在重启后依然生效。
set -u

RELAY_DIR=/root/lanremote-relay

echo "===== 1. 持久化配置在位吗 ====="
echo -n "  sysctl 文件: "
[ -f /etc/sysctl.d/99-lanremote-mtu.conf ] && echo "有" || echo "缺！"
echo -n "  开机服务: "
systemctl is-enabled lanremote-nettune.service 2>/dev/null || echo "没启用！"
echo -n "  调优脚本: "
[ -x "$RELAY_DIR/net-tune.sh" ] && echo "有且可执行" || echo "缺！"

echo
echo "===== 2. 模拟重启：停掉服务 -> 清掉规则 -> 重新应用 ====="
systemctl stop lanremote-nettune.service >/dev/null 2>&1
# 手工清掉规则和 sysctl，模拟重启后的初始状态
for chain in OUTPUT POSTROUTING; do
    for v in 1300 1360 1400 1440; do
        while iptables -t mangle -C "$chain" -p tcp --tcp-flags SYN,RST SYN \
                -j TCPMSS --set-mss "$v" 2>/dev/null; do
            iptables -t mangle -D "$chain" -p tcp --tcp-flags SYN,RST SYN \
                -j TCPMSS --set-mss "$v" 2>/dev/null || break
        done
    done
done
sysctl -w net.ipv4.tcp_mtu_probing=0 >/dev/null 2>&1

echo "  清理后："
echo "    tcp_mtu_probing = $(cat /proc/sys/net/ipv4/tcp_mtu_probing)"
echo "    MSS 规则 $(iptables -t mangle -L -n 2>/dev/null | grep -ci mss) 条"

echo
echo "  启动开机服务（模拟开机自动执行）…"
systemctl start lanremote-nettune.service
sleep 2

echo "  应用后："
echo "    tcp_mtu_probing = $(cat /proc/sys/net/ipv4/tcp_mtu_probing)"
echo "    MSS 规则 $(iptables -t mangle -L -n 2>/dev/null | grep -ci mss) 条"
iptables -t mangle -L -n 2>/dev/null | grep -i mss | sed 's/^/      /'

echo
echo "===== 3. 确认三项服务都在 ====="
for s in lanremote-nettune.service lanremote-relay lanremote-tunnel \
         lanremote-watchdog.timer; do
    printf "  %-30s %-10s %s\n" "$s" \
        "$(systemctl is-active "$s" 2>/dev/null)" \
        "$(systemctl is-enabled "$s" 2>/dev/null)"
done

echo
echo "===== 4. 应用后快速验证（12 次）====="
ok=0
for i in $(seq 1 12); do
    c=$(timeout 12 curl -4 -s -o /dev/null -w '%{http_code}' \
        -H 'User-Agent: LanRemote/1.4.0' https://relay.xxmxxs.top/v1/health 2>/dev/null)
    [ "$c" = "200" ] && ok=$((ok+1))
    sleep 2
done
echo "  公网可用 $ok/12"

echo
echo "===== 结论 ====="
if [ "$(cat /proc/sys/net/ipv4/tcp_mtu_probing)" = "1" ] \
   && [ "$(iptables -t mangle -L -n 2>/dev/null | grep -ci mss)" -ge 2 ]; then
    echo "  ✓ 调优能自动恢复（重启后开机服务会应用）"
else
    echo "  ✗ 持久化有问题"
fi