add fail2ban plugin

diff --git a/python.d/fail2ban.chart.py b/python.d/fail2ban.chart.py
new file mode 100644 (file)
index 0000000..2d80282
--- /dev/null
+++ b/python.d/fail2ban.chart.py
@@ -0,0 +1,91 @@
+# -*- coding: utf-8 -*-
+# Description: fail2ban log netdata python.d module
+# Author: l2isbad
+
+from base import LogService
+from re import compile
+try:
+    from itertools import filterfalse
+except ImportError:
+    from itertools import ifilterfalse as filterfalse
+from os import access as is_accessible, R_OK
+
+priority = 60000
+retries = 60
+regex = compile(r'([A-Za-z-]+\]) enabled = ([a-z]+)')
+
+ORDER = ['jails_group']
+
+
+class Service(LogService):
+    def __init__(self, configuration=None, name=None):
+        LogService.__init__(self, configuration=configuration, name=name)
+        self.order = ORDER
+        self.log_path = self.configuration.get('log_path', '/var/log/fail2ban.log')
+        self.conf_path = self.configuration.get('conf_path', '/etc/fail2ban/jail.local')
+        self.default_jails = ['ssh']
+        try:
+            self.exclude = self.configuration['exclude'].split()
+        except (KeyError, AttributeError):
+            self.exclude = []
+        
+
+    def _get_data(self):
+        """
+        Parse new log lines
+        :return: dict
+        """
+
+        # If _get_raw_data returns empty list (no new lines in log file) we will send to Netdata this
+        self.data = {jail: 0 for jail in self.jails_list}
+        
+        try:
+            raw = self._get_raw_data()
+            if raw is None:
+                return None
+            elif not raw:
+                return self.data
+        except (ValueError, AttributeError):
+            return None
+
+        # Fail2ban logs looks like
+        # 2016-12-25 12:36:04,711 fail2ban.actions[2455]: WARNING [ssh] Ban 178.156.32.231
+        self.data = dict(
+            zip(
+                self.jails_list,
+                [len(list(filterfalse(lambda line: (jail + '] Ban') not in line, raw))) for jail in self.jails_list]
+            ))
+
+        return self.data
+
+    def check(self):
+            
+        # Check "log_path" is accessible.
+        # If NOT STOP plugin
+        if not is_accessible(self.log_path, R_OK):
+            self.error('Cannot access file %s' % (self.log_path))
+            return False
+
+        # Check "conf_path" is accessible.
+        # If "conf_path" is accesible try to parse it to find enabled jails
+        if is_accessible(self.conf_path, R_OK):
+            with open(self.conf_path, 'rt') as jails_conf:
+                jails_list = regex.findall(' '.join(jails_conf.read().split()))
+            self.jails_list = [jail[:-1] for jail, status in jails_list if status == 'true']
+        else:
+            self.jails_list = []
+            self.error('Cannot access jail.local file %s.' % (self.conf_path))
+        
+        # If for some reason parse failed we still can START with default jails_list.
+        self.jails_list = [jail for jail in self.jails_list if jail not in self.exclude]\
+                                              if self.jails_list else self.default_jails
+        self.create_dimensions()
+        self.info('Plugin succefully started. Jails: %s' % (self.jails_list))
+        return True
+
+    def create_dimensions(self):
+        self.definitions = {'jails_group':
+                                {'options':
+                                     [None, "Jails ban statistics", "bans/s", 'Jails', 'jail.ban', 'line'], 'lines': []}}
+        for jail in self.jails_list:
+            self.definitions['jails_group']['lines'].append([jail, jail, 'absolute'])