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#!/usr/bin/env python
#
# This syslog server receives UDP based syslog entries and
# serves them in the format munin can understand
#
# Read an EDI dump file and transmit over UDP
#
# The MIT License (MIT)
#
# Copyright (c) 2017 Matthias P. Braendli
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
# THE SOFTWARE.
HOST, syslogport, muninport = "127.0.0.1", 51400, 51401
import SocketServer
import Queue
import re
import threading
LOG_FACILITY = {
0: 'kernel messages',
1: 'user-level messages',
2: 'mail system',
3: 'system daemons',
4: 'security/authorization messages',
5: 'messages generated internally by syslogd',
6: 'line printer subsystem',
7: 'network news subsystem',
8: 'UUCP subsystem',
9: 'clock daemon',
10: 'security/authorization messages',
11: 'FTP daemon',
12: 'NTP subsystem',
13: 'log audit',
14: 'log alert',
15: 'clock daemon',
16: 'local use 0 (local0)',
17: 'local use 1 (local1)',
18: 'local use 2 (local2)',
19: 'local use 3 (local3)',
20: 'local use 4 (local4)',
21: 'local use 5 (local5)',
22: 'local use 6 (local6)',
23: 'local use 7 (local7)'
}
LOG_LEVEL = {
0: 'Emergency',
1: 'Alert',
2: 'Critical',
3: 'Error',
4: 'Warning',
5: 'Notice',
6: 'Informational',
7: 'Debug'
}
def split_priority_from_message(msg):
'''
https://www.fir3net.com/UNIX/Linux/how-to-determine-the-syslog-facility-
using-tcpdump.html
Each Syslog message contains a priority value. The priority value is
enclosed within the characters < >. The priority value can be
between 0 and 191 and consists of a Facility value and a Level value.
Facility being the type of message, such as a kernel or mail message.
And level being a severity level of the message.
To calculate the priority value the following formula is used :
Priority = Facility * 8 + Level
So to determine the facility value of a syslog message we divide the
priority value by 8. The remainder is the level value.
'''
match = re.search(r"\b(?=\w)(\d*)\b(?!\w)>(.*)", msg, re.MULTILINE)
if match:
result = match.group(1)
return int(result), str(match.group(2))
else:
raise
def get_facility_from_priority(priority):
return int(priority/8)
def get_level_from_priority(priority):
return priority % 8
class ThreadedUDPServer(SocketServer.ThreadingMixIn, SocketServer.UDPServer):
pass
class SyslogUDPHandler(SocketServer.BaseRequestHandler):
def handle(self):
data = bytes.decode(self.request[0].strip())
socket = self.request[1]
syslog_message = str(data)
priority, text = split_priority_from_message(syslog_message)
facility = get_facility_from_priority(priority)
lvl = get_level_from_priority(priority)
logentry = dict()
logentry['raw'] = syslog_message
logentry['level'] = LOG_LEVEL[lvl]
logentry['facility'] = LOG_FACILITY[facility]
logentry['text'] = text
print("Push {}".format(logentry['text']))
logentries.put(logentry)
munin_config = """
multigraph mmbtools_log
graph_title mmbTools errors and warnings
graph_order high low
graph_args --base 1000
graph_vlabel number of entries in log during last ${{graph_period}}
graph_category mmbtools
graph_info This graph shows number of error and warning messages generated by the mmbTools
errors.info Errors
errors.label Errors
errors.min 0
errors.type ABSOLUTE
warnings.info Warnings
warnings.label Warnings
warnings.min 0
warnings.type ABSOLUTE
"""
class MuninHandler(SocketServer.BaseRequestHandler):
def handle(self):
global error_count, warning_count
self.data = self.request.recv(128).strip()
print self.data
if self.data == 'config':
self.request.sendall(munin_config)
elif self.data == 'values':
self.update_log_counts()
values = ["multigraph mmbtools_log"]
values += ["errors.value {}".format(error_count)]
values += ["warnings.value {}".format(warning_count)]
error_count = 0
warning_count = 0
self.request.sendall("\n".join(values) + "\n")
def update_log_counts(self):
global error_count, warning_count
try:
while True:
entry = logentries.get_nowait()
print("Pop {}".format(entry['text']))
if entry['level'] in ['Emergency', 'Alert', 'Critical', 'Error']:
error_count += 1
elif entry['level'] == 'Warning':
warning_count += 1
except Queue.Empty:
print("No data in queue")
if __name__ == "__main__":
try:
print("Startup")
logentries = Queue.Queue(10000)
error_count = 0
warning_count = 0
muninserver = None
logudp = None
print("Init Syslog handler")
logudp = ThreadedUDPServer((HOST, syslogport), SyslogUDPHandler)
print("Create Syslog thread")
syslogthread = threading.Thread(target=logudp.serve_forever, kwargs={'poll_interval': 0.1})
print("Init Munin handler")
muninserver = SocketServer.TCPServer((HOST, muninport), MuninHandler)
print("Starting handlers")
syslogthread.start()
muninserver.serve_forever()
except KeyboardInterrupt:
print("Ctrl-C received")
finally:
if muninserver is not None:
muninserver.shutdown()
if logudp is not None:
logudp.shutdown()
print("Waiting for thread to finish")
syslogthread.join()
print("Quitting")
|
