Log client IP in failed accesses

[benrubson]

Hello,

This PR adds the client IP in the LH_AUTH_NG message, the authentication failure message.
This allow to use tools such as Fail2Ban to ban IPs with too many authentication failures / retries.

Thank you very much for your help & support 👍

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Same as SoftEtherVPN/SoftEtherVPN_Stable#8

[benrubson]

Note that I did not updated strtable_cn.stb & strtable_ja.stb files, as I don't know really know how to deal with them, feel free then :)
Thank you 👍

[chipitsine]

can you please duplicate lines from "en" to strtable_cn.stb & strtable_ja.stb ?

I'm afraid otherwise it will break in runtime

[benrubson]

Thank you @chipitsine for your review 👍
I just modified all strtable_* files with the new error message.
I also performed same modification in the stable PR.
Thank you also @davidebeatrici 👍

[metalefty]

Thank you for this. This is also useful to me.

[benrubson]

Also note that we however suffer from the limitation described there : #260

[benrubson]

Fail2Ban jail merged 👍 fail2ban/fail2ban#2723

[davidebeatrici]

Awesome, thanks!

[benrubson]

Thanks too !
Feel free @davidebeatrici if you have an idea / have time to help with #260 (comment) :)
That's the last log system limitation we have...
Thank you again 👍