add update.motd

update.motd/50-fail2ban-status

@@ -0,0 +1,19 @@
+#!/bin/bash
+
+# fail2ban-client status to get all jails, takes about ~70ms
+jails=($(fail2ban-client status | grep "Jail list:" | sed "s/ //g" | awk '{split($2,a,",");for(i in a) print a[i]}'))
+
+out="jail,failed,total,banned,total\n"
+
+for jail in ${jails[@]}; do
+    # slow because fail2ban-client has to be called for every jail (~70ms per jail)
+    status=$(fail2ban-client status ${jail})
+    failed=$(echo "$status" | grep -ioP '(?<=Currently failed:\t)[[:digit:]]+')
+    totalfailed=$(echo "$status" | grep -ioP '(?<=Total failed:\t)[[:digit:]]+')
+    banned=$(echo "$status" | grep -ioP '(?<=Currently banned:\t)[[:digit:]]+')
+    totalbanned=$(echo "$status" | grep -ioP '(?<=Total banned:\t)[[:digit:]]+')
+    out+="$jail,$failed,$totalfailed,$banned,$totalbanned\n"
+done
+
+printf "\nfail2ban status:\n"
+printf $out | column -ts $',' | sed -e 's/^/  /'