#!/bin/bash
# 查隧道反复重连的根因：内存限制？OOM？DNS 差异？
set -u

echo "════════ 1. 内存总览 ════════"
free -m | sed 's/^/  /'

echo
echo "════════ 2. 各进程内存占用 ════════"
ps aux --sort=-rss 2>/dev/null | head -8 | awk '{printf "  %-8s %6s MB  %s\n", $1, int($6/1024), $11}' 

echo
echo "════════ 3. 隧道 unit 里的内存限制 ════════"
grep -E 'MemoryMax|MemoryHigh|Restart' /etc/systemd/system/lanremote-tunnel.service | sed 's/^/  /'
echo "  当前实际用量:"
systemctl show lanremote-tunnel -p MemoryCurrent -p MemoryMax --value 2>/dev/null | sed 's/^/    /'

echo
echo "════════ 4. 有没有被 OOM 杀过 ════════"
journalctl -u lanremote-tunnel --since '6 hours ago' --no-pager 2>/dev/null \
    | grep -iE 'oom|killed|memory|out of memory' | tail -8 | sed 's/^/  /'
echo "  dmesg 里的 OOM:"
dmesg 2>/dev/null | grep -iE 'oom|killed process' | tail -6 | sed 's/^/  /'
echo "  （没输出=没被 OOM 杀）"

echo
echo "════════ 5. 隧道服务重启过几次 ════════"
journalctl -u lanremote-tunnel --since '6 hours ago' --no-pager 2>/dev/null \
    | grep -cE 'Started|Stopped|Deactivated' | sed 's/^/  系统层面事件数: /'
echo "  最近的启动/停止:"
journalctl -u lanremote-tunnel --since '6 hours ago' --no-pager 2>/dev/null \
    | grep -E 'Started|Stopped|Deactivated|killed' | tail -8 | sed 's/^/    /'

echo
echo "════════ 6. 隧道日志里重连的频率 ════════"
echo "  最近 6 小时的日志行数: $(wc -l < /root/lanremote-relay/tunnel.log)"
for kw in 'Registered tunnel connection' 'Lost connection' 'Retrying connection' 'i/o timeout'; do
    n=$(tail -3000 /root/lanremote-relay/tunnel.log 2>/dev/null | grep -c "$kw")
    printf "  %-32s %s 次\n" "$kw" "$n"
done

echo
echo "════════ 7. DNS：设备这边解析到哪 ════════"
getent hosts relay.xxmxxs.top | sed 's/^/  /'
echo "  直接问 1.1.1.1:"
nslookup relay.xxmxxs.top 1.1.1.1 2>/dev/null | grep -A2 'Name:' | sed 's/^/    /'

echo
echo "════════ 8. relay.log 里的错误（最后 15 条）════════"
tail -400 /root/lanremote-relay/relay.log 2>/dev/null \
    | grep -iE 'error|exception|traceback|broken|reset' | tail -15 | sed 's/^/  /'
echo "  （没输出=没有明显错误）"

echo
echo "════════ 9. relay.log 最后 12 行（看它在干什么）════════"
tail -12 /root/lanremote-relay/relay.log 2>/dev/null | sed 's/^/  /'

echo
echo "════════ 10. watchdog 在干什么 ════════"
tail -12 /root/lanremote-relay/watchdog.log 2>/dev/null | sed 's/^/  /'
echo "  watchdog 服务: $(systemctl is-active lanremote-watchdog 2>&1)"