LSOF 连接已建立
我想知道，Does that 的输出是否
lsof -i
sshd 21880 root 3r IPv4 4843515 TCP somehost.lu.isp.com:ssh->d-XX-XXX.ITS.SOMEWHERE.COM:45037 (ESTABLISHED)
sshd 21882 mike 3u IPv4 4843515 TCP somehost.lu.isp.com:ssh->d-XX-XXX.ITS.SOMEWHERE.COM:45037 (ESTABLISHED)
sshd 23853 root 3u IPv6 960417 TCP *:ssh (LISTEN)
sshd 23853 root 4u IPv4 960419 TCP *:ssh (LISTEN)
sshd 24043 root 3r IPv4 4871654 TCP somehost.lu.isp.com:ssh->XXX.XX.XXX.XXX:42104 (ESTABLISHED)
sshd 24044 sshd 3u IPv4 4871654 TCP somehost.lu.isp.com:ssh->XXX.XX.XXX.XXX:42104 (ESTABLISHED)
意味着有人已登录系统并且当前正在执行某些操作？ 或者意味着它只是尝试登录？ 我对此不太确定。
有什么线索吗？ 谢谢
I was wondering, if the output of
lsof -i
sshd 21880 root 3r IPv4 4843515 TCP somehost.lu.isp.com:ssh->d-XX-XXX.ITS.SOMEWHERE.COM:45037 (ESTABLISHED)
sshd 21882 mike 3u IPv4 4843515 TCP somehost.lu.isp.com:ssh->d-XX-XXX.ITS.SOMEWHERE.COM:45037 (ESTABLISHED)
sshd 23853 root 3u IPv6 960417 TCP *:ssh (LISTEN)
sshd 23853 root 4u IPv4 960419 TCP *:ssh (LISTEN)
sshd 24043 root 3r IPv4 4871654 TCP somehost.lu.isp.com:ssh->XXX.XX.XXX.XXX:42104 (ESTABLISHED)
sshd 24044 sshd 3u IPv4 4871654 TCP somehost.lu.isp.com:ssh->XXX.XX.XXX.XXX:42104 (ESTABLISHED)
Does that imply that somebody has logged in on the system and is currently doing something? or means it's just trying to log in? I'm not quite sure about it.
Any clues? Thanks
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根据 this
lsof -i 只显示活动的 TCP 连接。 因此它不会告诉您是否已登录或仍在尝试进行身份验证。
如果您想检查谁登录了以及从哪里可以运行“who”命令。
这将为您提供登录用户的列表以及登录位置（例如 ssh、tty 等）
According to this
lsof -i only shows you active tcp connections. So it doesn't tell you if there logged in or still attempting to authenticate.
if you want to check to see who's logged in and from where you can run the "who" command.
which will give you a list of the users logged in and where there logged in from (e.g. ssh, tty, etc)
“ESTABLISHED”表示TCP 连接已建立，即握手已在TCP/IP 级别上执行。 在 ssh 进程看到任何数据之前，这是必需的。 理论上，根据超时设置（在 TCP 级别和/或 sshd 配置上），在 ESTABLISHED 模式下连接可能会很长，而不发送任何数据。 预计在此之后会发生登录。
要进一步了解它，请使用“iptraf”来监视流量，或者查看 /var/log/auth.log（至少在 Debian 系统上）以查看谁成功登录。
The 'ESTABLISHED' means the TCP connection is established, ie the handshake has been performed on TCP/IP level. This is needed before the ssh process sees any data at all. Theoretically, the connection could be quite long in ESTABLISHED mode without sending any data depending on the timeouts set (on TCP level and/or sshd config). Expect login to occur after it.
To look into it more, use 'iptraf' for monitoring the amount of traffic, or see /var/log/auth.log (at least, on a Debian system) for seeing who succesfully logged on.