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- #!/bin/bash
- logfile='/var/log/fail2ban.log*'
- mapfile -t lines < <(grep -hioP '(\[[a-z-]+\]) (ban|unban)' $logfile | sort | uniq -c)
- jails=($(printf -- '%s\n' "${lines[@]}" | grep -oP '\[\K[^\]]+' | sort | uniq))
- out=""
- for jail in ${jails[@]}; do
- bans=$(printf -- '%s\n' "${lines[@]}" | grep -iP "[[:digit:]]+ \[$jail\] ban" | awk '{print $1}')
- unbans=$(printf -- '%s\n' "${lines[@]}" | grep -iP "[[:digit:]]+ \[$jail\] unban" | awk '{print $1}')
- bans=${bans:-0} # default value
- unbans=${unbans:-0} # default value
- diff=$(($bans-$unbans))
- out+=$(printf "$jail, %+3s bans, %+3s unbans, %+3s active" $bans $unbans $diff)"\n"
- done
- printf "\nfail2ban status (monthly):\n"
- printf "$out" | column -ts $',' | sed -e 's/^/ /'
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