mirror of
https://github.com/alerta/alerta.git
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218 lines
6.9 KiB
Python
218 lines
6.9 KiB
Python
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import os
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import sys
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import datetime
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import re
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from alerta.common import config
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from alerta.common import log as logging
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from alerta.common.alert import Alert
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from alerta.common.heartbeat import Heartbeat
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from alerta.common import severity_code
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from alerta.common.api import ApiClient
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from alerta.common.graphite import StatsD
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Version = '2.0.15'
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LOG = logging.getLogger(__name__)
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CONF = config.CONF
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class SnmpTrapHandler(object):
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def __init__(self, prog, disable_flag=None):
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self.prog = prog
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self.disable_flag = disable_flag or CONF.disable_flag
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def start(self):
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LOG.info('Starting %s...' % self.prog)
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self.skip_on_disable()
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self.run()
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def skip_on_disable(self):
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if os.path.isfile(self.disable_flag):
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LOG.warning('Disable flag %s exists. Skipping...', self.disable_flag)
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sys.exit(0)
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def run(self):
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self.statsd = StatsD() # graphite metrics
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data = sys.stdin.read()
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LOG.info('snmptrapd -> %r', data)
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data = unicode(data, 'utf-8', errors='ignore')
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LOG.debug('unicoded -> %s', data)
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snmptrapAlert = SnmpTrapHandler.parse_snmptrap(data)
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self.api = ApiClient()
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if snmptrapAlert:
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self.api.send(snmptrapAlert)
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self.statsd.metric_send('alert.snmptrap.alerts.total', 1)
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LOG.debug('Send heartbeat...')
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heartbeat = Heartbeat(version=Version)
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self.api.send(heartbeat)
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@staticmethod
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def parse_snmptrap(data):
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pdu_data = data.splitlines()
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varbind_list = pdu_data[:]
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trapvars = dict()
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for line in pdu_data:
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if line.startswith('$'):
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special, value = line.split(None, 1)
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trapvars[special] = value
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varbind_list.pop(0)
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if '$s' in trapvars:
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if trapvars['$s'] == '0':
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version = 'SNMPv1'
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elif trapvars['$s'] == '1':
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version = 'SNMPv2c'
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elif trapvars['$s'] == '2':
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version = 'SNMPv2u' # not supported
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else:
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version = 'SNMPv3'
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trapvars['$s'] = version
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# Get varbinds
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varbinds = dict()
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idx = 0
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for varbind in '\n'.join(varbind_list).split('~%~'):
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if varbind == '':
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break
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idx += 1
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try:
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oid, value = varbind.split(None, 1)
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except ValueError:
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oid = varbind
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value = ''
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varbinds[oid] = value
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trapvars['$' + str(idx)] = value # $n
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LOG.debug('$%s %s', str(idx), value)
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trapvars['$q'] = trapvars['$q'].lstrip('.') # if numeric, remove leading '.'
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trapvars['$#'] = str(idx)
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LOG.debug('varbinds = %s', varbinds)
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LOG.debug('version = %s', version)
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correlate = list()
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if version == 'SNMPv1':
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if trapvars['$w'] == '0':
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trapvars['$O'] = 'coldStart'
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correlate = ['coldStart', 'warmStart']
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elif trapvars['$w'] == '1':
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trapvars['$O'] = 'warmStart'
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correlate = ['coldStart', 'warmStart']
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elif trapvars['$w'] == '2':
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trapvars['$O'] = 'linkDown'
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correlate = ['linkUp', 'linkDown']
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elif trapvars['$w'] == '3':
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trapvars['$O'] = 'linkUp'
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correlate = ['linkUp', 'linkDown']
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elif trapvars['$w'] == '4':
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trapvars['$O'] = 'authenticationFailure'
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elif trapvars['$w'] == '5':
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trapvars['$O'] = 'egpNeighborLoss'
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elif trapvars['$w'] == '6': # enterpriseSpecific(6)
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if trapvars['$q'].isdigit(): # XXX - specific trap number was not decoded
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trapvars['$O'] = '%s.0.%s' % (trapvars['$N'], trapvars['$q'])
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else:
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trapvars['$O'] = trapvars['$q']
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elif version == 'SNMPv2c':
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if 'coldStart' in trapvars['$2']:
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trapvars['$w'] = '0'
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trapvars['$W'] = 'Cold Start'
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elif 'warmStart' in trapvars['$2']:
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trapvars['$w'] = '1'
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trapvars['$W'] = 'Warm Start'
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elif 'linkDown' in trapvars['$2']:
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trapvars['$w'] = '2'
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trapvars['$W'] = 'Link Down'
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elif 'linkUp' in trapvars['$2']:
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trapvars['$w'] = '3'
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trapvars['$W'] = 'Link Up'
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elif 'authenticationFailure' in trapvars['$2']:
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trapvars['$w'] = '4'
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trapvars['$W'] = 'Authentication Failure'
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elif 'egpNeighborLoss' in trapvars['$2']:
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trapvars['$w'] = '5'
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trapvars['$W'] = 'EGP Neighbor Loss'
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else:
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trapvars['$w'] = '6'
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trapvars['$W'] = 'Enterprise Specific'
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trapvars['$O'] = trapvars['$2'] # SNMPv2-MIB::snmpTrapOID.0
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LOG.debug('trapvars = %s', trapvars)
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LOG.info('%s-Trap-PDU %s from %s at %s %s', version, trapvars['$O'], trapvars['$B'], trapvars['$x'], trapvars['$X'])
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if trapvars['$B'] != '<UNKNOWN>':
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resource = trapvars['$B']
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elif trapvars['$A'] != '0.0.0.0':
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resource = trapvars['$A']
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else:
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m = re.match(r'UDP: \[(\d+\.\d+\.\d+\.\d+)\]', trapvars['$b'])
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if m:
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resource = m.group(1)
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else:
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resource = '<NONE>'
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# Defaults
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event = trapvars['$O']
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severity = severity_code.NORMAL
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group = 'SNMP'
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value = trapvars['$w']
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text = trapvars['$W']
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environment = ['INFRA']
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service = ['Network']
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tags = {'Version': version}
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timeout = None
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threshold_info = None
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summary = None
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create_time = datetime.datetime.strptime('%sT%s.000Z' % (trapvars['$x'], trapvars['$X']), '%Y-%m-%dT%H:%M:%S.%fZ')
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snmptrapAlert = Alert(
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resource=resource,
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event=event,
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correlate=correlate,
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group=group,
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value=value,
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severity=severity,
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environment=environment,
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service=service,
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text=text,
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event_type='snmptrapAlert',
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tags=tags,
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timeout=timeout,
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threshold_info=threshold_info,
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summary=summary,
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create_time=create_time,
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raw_data=data,
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)
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suppress = snmptrapAlert.transform_alert(trapoid=trapvars['$O'], trapvars=trapvars, varbinds=varbinds)
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if suppress:
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LOG.info('Suppressing %s SNMP trap', snmptrapAlert.event)
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LOG.debug('%s', snmptrapAlert)
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return
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snmptrapAlert.translate(trapvars)
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if snmptrapAlert.get_type() == 'Heartbeat':
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snmptrapAlert = Heartbeat(origin=snmptrapAlert.origin, version='n/a', timeout=snmptrapAlert.timeout)
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return snmptrapAlert
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