mirror of
https://github.com/drewkerrigan/nagios-http-json.git
synced 2024-11-22 02:13:47 +01:00
634 lines
24 KiB
Python
Executable File
634 lines
24 KiB
Python
Executable File
#!/usr/bin/env python3
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import urllib.request, urllib.error, urllib.parse
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import base64
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import json
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import argparse
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import sys
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import ssl
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from pprint import pprint
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from urllib.error import HTTPError
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from urllib.error import URLError
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plugin_description = \
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"""
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Check HTTP JSON Nagios Plugin
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Generic Nagios plugin which checks json values from a given endpoint against
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argument specified rules and determines the status and performance data for
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that service.
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"""
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OK_CODE = 0
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WARNING_CODE = 1
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CRITICAL_CODE = 2
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UNKNOWN_CODE = 3
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__version__ = '2.0.0'
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__version_date__ = '2020-03-22'
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class NagiosHelper:
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"""
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Help with Nagios specific status string formatting.
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"""
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message_prefixes = {OK_CODE: 'OK',
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WARNING_CODE: 'WARNING',
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CRITICAL_CODE: 'CRITICAL',
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UNKNOWN_CODE: 'UNKNOWN'}
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performance_data = ''
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warning_message = ''
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critical_message = ''
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unknown_message = ''
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def getMessage(self, message=''):
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"""
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Build a status-prefixed message with optional performance data
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generated externally
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"""
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message += self.warning_message
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message += self.critical_message
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message += self.unknown_message
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code = self.message_prefixes[self.getCode()]
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output = "{code}: Status {code}. {message}".format(code=code, message=message.strip())
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if self.performance_data:
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output = "{code}: {perf_data} Status {code}. {message}|{perf_data}".format(
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code=code,
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message=message.strip(),
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perf_data=self.performance_data)
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return output.strip()
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def getCode(self):
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code = OK_CODE
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if (self.warning_message != ''):
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code = WARNING_CODE
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if (self.critical_message != ''):
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code = CRITICAL_CODE
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if (self.unknown_message != ''):
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code = UNKNOWN_CODE
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return code
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def append_warning(self, warning_message):
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self.warning_message += warning_message
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def append_critical(self, critical_message):
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self.critical_message += critical_message
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def append_unknown(self, unknown_message):
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self.unknown_message += unknown_message
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def append_metrics(self, metrics):
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(performance_data, warning_message, critical_message) = metrics
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self.performance_data += performance_data
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self.append_warning(warning_message)
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self.append_critical(critical_message)
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class JsonHelper:
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"""
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Perform simple comparison operations against values in a given
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JSON dict
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"""
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def __init__(self, json_data, separator, value_separator):
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self.data = json_data
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self.separator = separator
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self.value_separator = value_separator
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self.arrayOpener = '('
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self.arrayCloser = ')'
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def getSubElement(self, key, data):
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separatorIndex = key.find(self.separator)
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partialKey = key[:separatorIndex]
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remainingKey = key[separatorIndex + 1:]
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if partialKey in data:
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return self.get(remainingKey, data[partialKey])
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return (None, 'not_found')
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def getSubArrayElement(self, key, data):
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subElemKey = key[:key.find(self.arrayOpener)]
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index = int(key[key.find(self.arrayOpener) +
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1:key.find(self.arrayCloser)])
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remainingKey = key[key.find(self.arrayCloser + self.separator) + 2:]
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if key.find(self.arrayCloser + self.separator) == -1:
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remainingKey = key[key.find(self.arrayCloser) + 1:]
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if subElemKey in data:
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if index < len(data[subElemKey]):
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return self.get(remainingKey, data[subElemKey][index])
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else:
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return (None, 'not_found')
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if index >= len(data):
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return (None, 'not_found')
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else:
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if not subElemKey:
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return self.get(remainingKey, data[index])
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else:
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return (None, 'not_found')
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def equals(self, key, value):
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return self.exists(key) and \
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str(self.get(key)) in value.split(self.value_separator)
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def lte(self, key, value):
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return self.exists(key) and float(self.get(key)) <= float(value)
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def lt(self, key, value):
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return self.exists(key) and float(self.get(key)) < float(value)
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def gte(self, key, value):
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return self.exists(key) and float(self.get(key)) >= float(value)
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def gt(self, key, value):
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return self.exists(key) and float(self.get(key)) > float(value)
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def exists(self, key):
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return (self.get(key) != (None, 'not_found'))
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def get(self, key, temp_data=''):
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"""
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Can navigate nested json keys with a dot format
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(Element.Key.NestedKey). Returns (None, 'not_found') if not found
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"""
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if temp_data:
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data = temp_data
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else:
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data = self.data
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if len(key) <= 0:
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return data
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if key.find(self.separator) != -1 and \
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key.find(self.arrayOpener) != -1:
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if key.find(self.separator) < key.find(self.arrayOpener):
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return self.getSubElement(key, data)
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else:
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return self.getSubArrayElement(key, data)
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else:
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if key.find(self.separator) != -1:
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return self.getSubElement(key, data)
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else:
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if key.find(self.arrayOpener) != -1:
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return self.getSubArrayElement(key, data)
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else:
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if isinstance(data, dict) and key in data:
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return data[key]
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else:
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return (None, 'not_found')
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def expandKey(self, key, keys):
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if '(*)' not in key:
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keys.append(key)
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return keys
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subElemKey = ''
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if key.find('(*)') > 0:
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subElemKey = key[:key.find('(*)')-1]
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remainingKey = key[key.find('(*)')+3:]
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elemData = self.get(subElemKey)
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if elemData == (None, 'not_found'):
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keys.append(key)
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return keys
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if subElemKey != '':
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subElemKey = subElemKey + '.'
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for i in range(len(elemData)):
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newKey = subElemKey + '(' + str(i) + ')' + remainingKey
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newKeys = self.expandKey(newKey, [])
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for j in newKeys:
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keys.append(j)
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return keys
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def _getKeyAlias(original_key):
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key = original_key
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alias = original_key
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if '>' in original_key:
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keys = original_key.split('>')
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if len(keys) == 2:
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key, alias = keys
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return key, alias
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class JsonRuleProcessor:
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"""
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Perform checks and gather values from a JSON dict given rules
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and metrics definitions
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"""
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def __init__(self, json_data, rules_args):
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self.data = json_data
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self.rules = rules_args
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separator = '.'
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value_separator = ':'
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if self.rules.separator:
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separator = self.rules.separator
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if self.rules.value_separator:
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value_separator = self.rules.value_separator
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self.helper = JsonHelper(self.data, separator, value_separator)
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debugPrint(rules_args.debug, "rules:%s" % rules_args)
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debugPrint(rules_args.debug, "separator:%s" % separator)
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debugPrint(rules_args.debug, "value_separator:%s" % value_separator)
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self.metric_list = self.expandKeys(self.rules.metric_list)
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self.key_threshold_warning = self.expandKeys(
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self.rules.key_threshold_warning)
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self.key_threshold_critical = self.expandKeys(
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self.rules.key_threshold_critical)
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self.key_value_list = self.expandKeys(self.rules.key_value_list)
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self.key_value_list_not = self.expandKeys(
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self.rules.key_value_list_not)
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self.key_list = self.expandKeys(self.rules.key_list)
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self.key_value_list_critical = self.expandKeys(
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self.rules.key_value_list_critical)
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self.key_value_list_not_critical = self.expandKeys(
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self.rules.key_value_list_not_critical)
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self.key_list_critical = self.expandKeys(self.rules.key_list_critical)
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self.key_value_list_unknown = self.expandKeys(
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self.rules.key_value_list_unknown)
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def expandKeys(self, src):
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if src is None:
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return []
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dest = []
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for key in src:
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newKeys = self.helper.expandKey(key, [])
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for k in newKeys:
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dest.append(k)
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return dest
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def checkExists(self, exists_list):
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failure = ''
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for k in exists_list:
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key, alias = _getKeyAlias(k)
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if (self.helper.exists(key) is False):
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failure += " Key %s did not exist." % alias
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return failure
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def checkEquality(self, equality_list):
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failure = ''
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for kv in equality_list:
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k, v = kv.split(',')
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key, alias = _getKeyAlias(k)
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if not self.helper.equals(key, v):
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failure += " Key %s mismatch. %s != %s" % (alias, v,
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self.helper.get(key))
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return failure
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def checkNonEquality(self, equality_list):
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failure = ''
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for kv in equality_list:
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k, v = kv.split(',')
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key, alias = _getKeyAlias(k)
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if self.helper.equals(key, v):
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failure += " Key %s match found. %s == %s" % (alias, v,
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self.helper.get(key))
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return failure
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def checkThreshold(self, key, alias, r):
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failure = ''
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invert = False
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start = 0
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end = 'infinity'
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if r.startswith('@'):
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invert = True
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r = r[1:]
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vals = r.split(':')
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if len(vals) == 1:
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end = vals[0]
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if len(vals) == 2:
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start = vals[0]
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if vals[1] != '':
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end = vals[1]
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if(start == '~'):
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if (invert and self.helper.lte(key, end)):
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failure += " Value (%s) for key %s was less than or equal to %s." % \
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(self.helper.get(key), alias, end)
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elif (not invert and self.helper.gt(key, end)):
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failure += " Value (%s) for key %s was greater than %s." % \
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(self.helper.get(key), alias, end)
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elif(end == 'infinity'):
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if (invert and self.helper.gte(key, start)):
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failure += " Value (%s) for key %s was greater than or equal to %s." % \
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(self.helper.get(key), alias, start)
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elif (not invert and self.helper.lt(key, start)):
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failure += " Value (%s) for key %s was less than %s." % \
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(self.helper.get(key), alias, start)
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else:
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if (invert and self.helper.gte(key, start) and
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self.helper.lte(key, end)):
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failure += " Value (%s) for key %s was inside the range %s:%s." % \
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(self.helper.get(key), alias, start, end)
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elif (not invert and (self.helper.lt(key, start) or
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self.helper.gt(key, end))):
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failure += " Value (%s) for key %s was outside the range %s:%s." % \
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(self.helper.get(key), alias, start, end)
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return failure
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def checkThresholds(self, threshold_list):
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failure = ''
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for threshold in threshold_list:
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k, r = threshold.split(',')
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key, alias = _getKeyAlias(k)
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failure += self.checkThreshold(key, alias, r)
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return failure
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def checkWarning(self):
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failure = ''
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if self.key_threshold_warning is not None:
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failure += self.checkThresholds(self.key_threshold_warning)
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if self.key_value_list is not None:
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failure += self.checkEquality(self.key_value_list)
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if self.key_value_list_not is not None:
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failure += self.checkNonEquality(self.key_value_list_not)
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if self.key_list is not None:
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failure += self.checkExists(self.key_list)
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return failure
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def checkCritical(self):
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failure = ''
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if self.key_threshold_critical is not None:
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failure += self.checkThresholds(self.key_threshold_critical)
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if self.key_value_list_critical is not None:
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failure += self.checkEquality(self.key_value_list_critical)
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if self.key_value_list_not_critical is not None:
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failure += self.checkNonEquality(self.key_value_list_not_critical)
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if self.key_list_critical is not None:
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failure += self.checkExists(self.key_list_critical)
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return failure
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def checkUnknown(self):
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unknown = ''
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if self.key_value_list_unknown is not None:
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unknown += self.checkEquality(self.key_value_list_unknown)
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return unknown
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def checkMetrics(self):
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"""
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Return a Nagios specific performance metrics string given keys
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and parameter definitions
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"""
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metrics = ''
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warning = ''
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critical = ''
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if self.metric_list is not None:
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for metric in self.metric_list:
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key = metric
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minimum = maximum = warn_range = crit_range = None
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uom = ''
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if ',' in metric:
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vals = metric.split(',')
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if len(vals) == 2:
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key, uom = vals
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if len(vals) == 4:
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key, uom, warn_range, crit_range = vals
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if len(vals) == 6:
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key, uom, warn_range, crit_range, \
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minimum, maximum = vals
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key, alias = _getKeyAlias(key)
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if self.helper.exists(key):
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metrics += "'%s'=%s" % (alias, self.helper.get(key))
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if uom:
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metrics += uom
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if warn_range is not None:
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warning += self.checkThreshold(key, alias, warn_range)
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metrics += ";%s" % warn_range
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if crit_range is not None:
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critical += self.checkThreshold(key, alias, crit_range)
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metrics += ";%s" % crit_range
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if minimum is not None:
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critical += self.checkThreshold(key, alias, minimum +
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':')
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metrics += ";%s" % minimum
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if maximum is not None:
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critical += self.checkThreshold(key, alias, '~:' +
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maximum)
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metrics += ";%s" % maximum
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metrics += ' '
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return ("%s" % metrics, warning, critical)
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def parseArgs(args):
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"""
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CLI argument definitions and parsing
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"""
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parser = argparse.ArgumentParser(
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description=plugin_description + '\n\nVersion: %s (%s)'
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%(__version__, __version_date__),
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formatter_class=argparse.RawDescriptionHelpFormatter
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)
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parser.add_argument('-d', '--debug', action='store_true',
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help='debug mode')
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parser.add_argument('-s', '--ssl', action='store_true',
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help='use TLS to connect to remote host')
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parser.add_argument('-H', '--host', dest='host',
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required=not ('-V' in sys.argv or '--version' in sys.argv),
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help='remote host to query')
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parser.add_argument('-k', '--insecure', action='store_true',
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help='do not check server SSL certificate')
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parser.add_argument('-V', '--version', action='store_true',
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help='print version of this plugin')
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parser.add_argument('--cacert',
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dest='cacert', help='SSL CA certificate')
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parser.add_argument('--cert',
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dest='cert', help='SSL client certificate')
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parser.add_argument('--key', dest='key',
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help='SSL client key ( if not bundled into the cert )')
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parser.add_argument('-P', '--port', dest='port', help='TCP port')
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parser.add_argument('-p', '--path', dest='path', help='Path')
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parser.add_argument('-t', '--timeout', type=int,
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help='Connection timeout (seconds)')
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parser.add_argument('-B', '--basic-auth', dest='auth',
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help='Basic auth string "username:password"')
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parser.add_argument('-D', '--data', dest='data',
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help='The http payload to send as a POST')
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parser.add_argument('-A', '--headers', dest='headers',
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help='The http headers in JSON format.')
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parser.add_argument('-f', '--field_separator', dest='separator',
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help='''JSON Field separator, defaults to ".";
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Select element in an array with "(" ")"''')
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parser.add_argument('-F', '--value_separator', dest='value_separator',
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help='''JSON Value separator, defaults to ":"''')
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parser.add_argument('-w', '--warning', dest='key_threshold_warning',
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nargs='*',
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help='''Warning threshold for these values
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(key1[>alias],WarnRange key2[>alias],WarnRange).
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WarnRange is in the format [@]start:end, more
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information at
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nagios-plugins.org/doc/guidelines.html.''')
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parser.add_argument('-c', '--critical', dest='key_threshold_critical',
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nargs='*',
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help='''Critical threshold for these values
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(key1[>alias],CriticalRange key2[>alias],CriticalRange.
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CriticalRange is in the format [@]start:end, more
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information at
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nagios-plugins.org/doc/guidelines.html.''')
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parser.add_argument('-e', '--key_exists', dest='key_list', nargs='*',
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help='''Checks existence of these keys to determine
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status. Return warning if key is not present.''')
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parser.add_argument('-E', '--key_exists_critical',
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dest='key_list_critical',
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nargs='*',
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help='''Same as -e but return critical if key is
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not present.''')
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parser.add_argument('-q', '--key_equals', dest='key_value_list', nargs='*',
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help='''Checks equality of these keys and values
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(key[>alias],value key2,value2) to determine status.
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Multiple key values can be delimited with colon
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(key,value1:value2). Return warning if equality
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check fails''')
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parser.add_argument('-Q', '--key_equals_critical',
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dest='key_value_list_critical', nargs='*',
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help='''Same as -q but return critical if
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equality check fails.''')
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parser.add_argument('-u', '--key_equals_unknown',
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dest='key_value_list_unknown', nargs='*',
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|
help='''Same as -q but return unknown if
|
|
equality check fails.''')
|
|
parser.add_argument('-y', '--key_not_equals',
|
|
dest='key_value_list_not', nargs='*',
|
|
help='''Checks equality of these keys and values
|
|
(key[>alias],value key2,value2) to determine status.
|
|
Multiple key values can be delimited with colon
|
|
(key,value1:value2). Return warning if equality
|
|
check succeeds''')
|
|
parser.add_argument('-Y', '--key_not_equals_critical',
|
|
dest='key_value_list_not_critical', nargs='*',
|
|
help='''Same as -q but return critical if equality
|
|
check succeeds.''')
|
|
parser.add_argument('-m', '--key_metric', dest='metric_list', nargs='*',
|
|
help='''Gathers the values of these keys (key[>alias],
|
|
UnitOfMeasure,WarnRange,CriticalRange,Min,Max) for
|
|
Nagios performance data. More information about Range
|
|
format and units of measure for nagios can be found at
|
|
nagios-plugins.org/doc/guidelines.html
|
|
Additional formats for this parameter are:
|
|
(key[>alias]), (key[>alias],UnitOfMeasure),
|
|
(key[>alias],UnitOfMeasure,WarnRange,
|
|
CriticalRange).''')
|
|
|
|
return parser.parse_args(args)
|
|
|
|
|
|
def debugPrint(debug_flag, message, pretty_flag=False):
|
|
"""
|
|
Print debug messages if -d (debug_flat ) is set.
|
|
"""
|
|
|
|
if debug_flag:
|
|
if pretty_flag:
|
|
pprint(message)
|
|
else:
|
|
print(message)
|
|
|
|
|
|
# Program entry point
|
|
if __name__ == "__main__":
|
|
|
|
args = parseArgs(sys.argv[1:])
|
|
nagios = NagiosHelper()
|
|
context = None
|
|
|
|
if args.version:
|
|
print('Version: %s - Date: %s' % (__version__, __version_date__))
|
|
sys.exit(0)
|
|
|
|
if args.ssl:
|
|
url = "https://%s" % args.host
|
|
|
|
context = ssl.SSLContext(ssl.PROTOCOL_SSLv23)
|
|
context.options |= ssl.OP_NO_SSLv2
|
|
context.options |= ssl.OP_NO_SSLv3
|
|
|
|
if args.insecure:
|
|
context.verify_mode = ssl.CERT_NONE
|
|
else:
|
|
context.verify_mode = ssl.CERT_OPTIONAL
|
|
if args.cacert:
|
|
try:
|
|
context.load_verify_locations(args.cacert)
|
|
except ssl.SSLError:
|
|
nagios.append_unknown(
|
|
'Error loading SSL CA cert "%s"!'
|
|
% args.cacert)
|
|
|
|
if args.cert:
|
|
try:
|
|
context.load_cert_chain(args.cert, keyfile=args.key)
|
|
except ssl.SSLError:
|
|
if args.key:
|
|
nagios.append_unknown(
|
|
'Error loading SSL cert. Make sure key "%s" belongs to cert "%s"!'
|
|
% (args.key, args.cert))
|
|
else:
|
|
nagios.append_unknown(
|
|
'Error loading SSL cert. Make sure "%s" contains the key as well!'
|
|
% (args.cert))
|
|
|
|
if nagios.getCode() != OK_CODE:
|
|
print(nagios.getMessage())
|
|
sys.exit(nagios.getCode())
|
|
|
|
else:
|
|
url = "http://%s" % args.host
|
|
if args.port:
|
|
url += ":%s" % args.port
|
|
if args.path:
|
|
url += "/%s" % args.path
|
|
|
|
debugPrint(args.debug, "url:%s" % url)
|
|
json_data = ''
|
|
|
|
try:
|
|
req = urllib.request.Request(url)
|
|
req.add_header("User-Agent", "check_http_json")
|
|
if args.auth:
|
|
authbytes = str(args.auth).encode()
|
|
base64str = base64.encodebytes(authbytes).decode().replace('\n', '')
|
|
req.add_header('Authorization', 'Basic %s' % base64str)
|
|
if args.headers:
|
|
headers = json.loads(args.headers)
|
|
debugPrint(args.debug, "Headers:\n %s" % headers)
|
|
for header in headers:
|
|
req.add_header(header, headers[header])
|
|
if args.timeout and args.data:
|
|
response = urllib.request.urlopen(req, timeout=args.timeout,
|
|
data=args.data, context=context)
|
|
elif args.timeout:
|
|
response = urllib.request.urlopen(req, timeout=args.timeout,
|
|
context=context)
|
|
elif args.data:
|
|
response = urllib.request.urlopen(req, data=args.data, context=context)
|
|
else:
|
|
response = urllib.request.urlopen(req, context=context)
|
|
|
|
json_data = response.read()
|
|
|
|
except HTTPError as e:
|
|
nagios.append_unknown(" HTTPError[%s], url:%s" % (str(e.code), url))
|
|
except URLError as e:
|
|
nagios.append_critical(" URLError[%s], url:%s" % (str(e.reason), url))
|
|
|
|
try:
|
|
data = json.loads(json_data)
|
|
except ValueError as e:
|
|
nagios.append_unknown(" Parser error: %s" % str(e))
|
|
|
|
else:
|
|
debugPrint(args.debug, 'json:')
|
|
debugPrint(args.debug, data, True)
|
|
# Apply rules to returned JSON data
|
|
processor = JsonRuleProcessor(data, args)
|
|
nagios.append_warning(processor.checkWarning())
|
|
nagios.append_critical(processor.checkCritical())
|
|
nagios.append_metrics(processor.checkMetrics())
|
|
nagios.append_unknown(processor.checkUnknown())
|
|
|
|
# Print Nagios specific string and exit appropriately
|
|
print(nagios.getMessage())
|
|
sys.exit(nagios.getCode())
|
|
|
|
#EOF
|