fail2ban data collector

fail2ban.sh

@@ -0,0 +1,32 @@
+#!/bin/bash
+
+# add to sudoers:
+# daemon ALL=(root) NOEXEC: NOPASSWD: /usr/bin/fail2ban-client status, /usr/bin/fail2ban-client status *
+
+source /usr/local/lib/collectd/_functions.sh
+
+function extract_fail2ban_value {
+    grep "${1}" <<< "${2}" | cut -d":" -f2 | xargs
+}
+
+plugin="fail2ban"
+while true; do
+    JAILS="$(sudo /usr/bin/fail2ban-client status 2>/dev/null | grep 'Jail list' | cut -d":" -f2 | tr ',' "\n" | xargs)"
+
+    for j in $JAILS; do
+        instance="$(echo "${j}" | tr '-' '_')"
+        status="$(sudo /usr/bin/fail2ban-client status "${j}" 2>/dev/null)"
+
+        declare -A data
+        data[total_failed]=$(extract_fail2ban_value "Total failed" "${status}")
+        data[currently_failed]=$(extract_fail2ban_value "Currently failed" "${status}")
+        data[total_banned]=$(extract_fail2ban_value "Total banned" "${status}")
+        data[currently_banned]=$(extract_fail2ban_value "Currently banned" "${status}")
+
+        for key in "${!data[@]}"; do
+            echo "PUTVAL $HOSTNAME/${plugin}-${instance}/gauge-${key} interval=$INTERVAL N:${data[$key]}"
+        done
+
+    done
+    sleep "$INTERVAL"
+done