mirror of
https://github.com/alerta/alerta-contrib.git
synced 2025-03-17 05:52:38 +00:00
304 lines
9.1 KiB
Python
304 lines
9.1 KiB
Python
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import sys
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import socket
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import select
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import re
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import logging
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from transform import Transformers
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from alerta.api import ApiClient
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from alerta.alert import Alert
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from alerta.heartbeat import Heartbeat
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SYSLOG_FACILITY_NAMES = [
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"kern",
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"user",
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"mail",
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"daemon",
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"auth",
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"syslog",
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"lpr",
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"news",
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"uucp",
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"cron",
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"authpriv",
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"ftp",
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"ntp",
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"audit",
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"alert",
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"clock",
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"local0",
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"local1",
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"local2",
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"local3",
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"local4",
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"local5",
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"local6",
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"local7"
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]
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SYSLOG_SEVERITY_NAMES = [
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"emerg",
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"alert",
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"crit",
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"err",
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"warning",
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"notice",
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"info",
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"debug"
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]
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SYSLOG_SEVERITY_MAP = {
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"emerg": "critical",
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"alert": "critical",
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"crit": "major",
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"err": "minor",
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"warning": "warning",
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"notice": "normal",
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"info": "informational",
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"debug": "debug",
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}
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DEFAULT_UDP_PORT = 514
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DEFAULT_TCP_PORT = 514
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def priority_to_code(name):
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return SYSLOG_SEVERITY_MAP.get(name, "unknown")
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def decode_priority(priority):
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facility = priority >> 3
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facility = SYSLOG_FACILITY_NAMES[facility]
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level = priority & 7
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level = SYSLOG_SEVERITY_NAMES[level]
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return facility, level
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__version__ = '3.3.0'
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LOOP_EVERY = 20 # seconds
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SYSLOG_UDP_PORT = 514
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SYSLOG_TCP_PORT = 514
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import settings
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LOG = logging.getLogger("alerta.syslog")
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logging.basicConfig(format="%(asctime)s - %(name)s: %(levelname)s - %(message)s", level=logging.DEBUG)
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class SyslogDaemon(object):
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def __init__(self):
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self.shuttingdown = False
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def run(self):
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LOG.info('Starting UDP listener...')
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# Set up syslog UDP listener
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try:
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udp = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
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udp.bind(('', SYSLOG_UDP_PORT))
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except socket.error, e:
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LOG.error('Syslog UDP error: %s', e)
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sys.exit(2)
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LOG.info('Listening on syslog port %s/udp' % SYSLOG_UDP_PORT)
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LOG.info('Starting TCP listener...')
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# Set up syslog TCP listener
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try:
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tcp = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
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tcp.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
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tcp.bind(('', SYSLOG_TCP_PORT))
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tcp.listen(5)
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except socket.error, e:
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LOG.error('Syslog TCP error: %s', e)
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sys.exit(2)
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LOG.info('Listening on syslog port %s/tcp' % SYSLOG_TCP_PORT)
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self.api = self.api = ApiClient(endpoint=settings.ENDPOINT, key=settings.API_KEY)
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count = 0
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while not self.shuttingdown:
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try:
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LOG.debug('Waiting for syslog messages...')
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ip, op, rdy = select.select([udp, tcp], [], [], LOOP_EVERY)
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if ip:
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for i in ip:
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if i == udp:
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data, addr = udp.recvfrom(4096)
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data = unicode(data, 'utf-8', errors='ignore')
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LOG.debug('Syslog UDP data received from %s: %s', addr, data)
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if i == tcp:
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client, addr = tcp.accept()
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data = client.recv(4096)
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data = unicode(data, 'utf-8', errors='ignore')
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client.close()
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LOG.debug('Syslog TCP data received from %s: %s', addr, data)
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syslogAlerts = self.parse_syslog(addr[0], data)
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for syslogAlert in syslogAlerts:
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try:
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self.api.send(syslogAlert)
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except Exception, e:
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LOG.warning('Failed to send alert: %s', e)
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count += 1
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if not ip or count % 5 == 0:
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LOG.debug('Send heartbeat...')
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heartbeat = Heartbeat(tags=[__version__])
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try:
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self.api.send(heartbeat)
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except Exception, e:
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LOG.warning('Failed to send heartbeat: %s', e)
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except (KeyboardInterrupt, SystemExit):
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self.shuttingdown = True
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LOG.info('Shutdown request received...')
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def parse_syslog(self, addr, data):
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LOG.debug('Parsing syslog message...')
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syslogAlerts = list()
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event = None
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resource = None
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for msg in data.split('\n'):
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# NOTE: if syslog msgs aren't being split on newlines and #012 appears instead then
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# try adding "$EscapeControlCharactersOnReceive off" to rsyslog.conf
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if not msg or 'last message repeated' in msg:
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continue
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if re.match('<\d+>1', msg):
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# Parse RFC 5424 compliant message
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m = re.match(r'<(\d+)>1 (\S+) (\S+) (\S+) (\S+) (\S+) (.*)', msg)
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if m:
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PRI = int(m.group(1))
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ISOTIMESTAMP = m.group(2)
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HOSTNAME = m.group(3)
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APPNAME = m.group(4)
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PROCID = m.group(5)
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MSGID = m.group(6)
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TAG = '%s[%s] %s' % (APPNAME, PROCID, MSGID)
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MSG = m.group(7)
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LOG.info("Parsed RFC 5424 message OK")
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else:
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LOG.error("Could not parse RFC 5424 syslog message: %s", msg)
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continue
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elif re.match(r'<(\d{1,3})>\S{3}\s', msg):
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# Parse RFC 3164 compliant message
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m = re.match(r'<(\d{1,3})>\S{3}\s{1,2}\d?\d \d{2}:\d{2}:\d{2} (\S+)( (\S+):)? (.*)', msg)
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if m:
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PRI = int(m.group(1))
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HOSTNAME = m.group(2)
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TAG = m.group(4)
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MSG = m.group(5)
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LOG.info("Parsed RFC 3164 message OK")
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else:
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LOG.error("Could not parse RFC 3164 syslog message: %s", msg)
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continue
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elif re.match('<\d+>.*%[A-Z0-9_-]+', msg):
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# Parse Cisco Syslog message
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m = re.match('<(\d+)>.*(%([A-Z0-9_-]+)):? (.*)', msg)
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if m:
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LOG.debug(m.groups())
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PRI = int(m.group(1))
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CISCO_SYSLOG = m.group(2)
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try:
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CISCO_FACILITY, CISCO_SEVERITY, CISCO_MNEMONIC = m.group(3).split('-')
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except ValueError, e:
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LOG.error('Could not parse Cisco syslog - %s: %s', e, m.group(3))
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CISCO_FACILITY = CISCO_SEVERITY = CISCO_MNEMONIC = 'na'
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TAG = CISCO_MNEMONIC
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MSG = m.group(4)
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event = CISCO_SYSLOG
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# replace IP address with a hostname, if necessary
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try:
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socket.inet_aton(addr)
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(resource, _, _) = socket.gethostbyaddr(addr)
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except (socket.error, socket.herror):
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resource = addr
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resource = '%s:%s' % (resource, CISCO_FACILITY)
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else:
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LOG.error("Could not parse Cisco syslog message: %s", msg)
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continue
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facility, level = decode_priority(PRI)
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# Defaults
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event = event or '%s%s' % (facility.capitalize(), level.capitalize())
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resource = resource or '%s%s' % (HOSTNAME, ':' + TAG if TAG else '')
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severity = priority_to_code(level)
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group = 'Syslog'
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value = level
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text = MSG
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environment = 'Production'
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service = ['Platform']
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tags = ['%s.%s' % (facility, level)]
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correlate = list()
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timeout = None
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raw_data = msg
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syslogAlert = 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='syslogAlert',
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tags=tags,
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timeout=timeout,
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raw_data=raw_data,
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)
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suppress = False
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try:
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suppress = Transformers.normalise_alert(syslogAlert, facility=facility, level=level)
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except RuntimeWarning:
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pass
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if suppress:
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LOG.info('Suppressing %s.%s alert', facility, level)
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LOG.debug('%s', syslogAlert)
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continue
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if syslogAlert.get_type() == 'Heartbeat':
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syslogAlert = Heartbeat(origin=syslogAlert.origin, timeout=syslogAlert.timeout)
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syslogAlerts.append(syslogAlert)
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return syslogAlerts
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def main():
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LOG = logging.getLogger("alerta.syslog")
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try:
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SyslogDaemon().run()
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except (SystemExit, KeyboardInterrupt):
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LOG.info("Exiting alerta syslog.")
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sys.exit(0)
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except Exception as e:
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LOG.error(e, exc_info=1)
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sys.exit(1)
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if __name__ == '__main__':
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main()
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