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This article mainly explains "how to use Shell script to achieve illegal IP login automatic alarm", the article explains the content is simple and clear, easy to learn and understand, the following please follow the editor's ideas slowly in depth, together to study and learn "how to use Shell script to achieve illegal IP login automatic alarm" bar!

The code is as follows:

#! / bin/bash

# this script is used to detect whether a malicious IP has logged in to the server and send an email alarm

# can be combined with 139 mailbox to achieve the function of timely notification of SMS to mobile phone.

# applicable system centos5

Ldate= `which date`

Lawk= `which awk`

Llast= `which last`

Lgrep= `which grep`

Lsendmail= `which sendmail`

Lifconfig= `which ifconfig`

Serverip= `$ Lifconfig eth0 | $Lgrep inet | $Lawk-F:'{print $2}'| $Lawk'{print $1}'`

Cutdate= `$ Ldate | $Lawk'{print $1 "" $2 "" $3}'`

Hackerip= `$ Llast | $Lgrep "$cutdate" | $Lawk'{print $3}'| $Lgrep-v 192.168.1x.xx`

If [- z $hackerip]

Then

Exit

Else

For logip in $hackerip

Do

Echo "hacker ip is $logip already login $serverip" | mail-s "SOS" rocdk890@139.com

Done

Fi

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