/usr/lib/python3/dist-packages/fail2ban/helpers.py is in fail2ban 0.9.3-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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# vi: set ft=python sts=4 ts=4 sw=4 noet :
# This file is part of Fail2Ban.
#
# Fail2Ban is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# Fail2Ban is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with Fail2Ban; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
__author__ = "Cyril Jaquier, Arturo 'Buanzo' Busleiman, Yaroslav Halchenko"
__license__ = "GPL"
import sys
import os
import traceback
import re
import logging
def formatExceptionInfo():
""" Consistently format exception information """
cla, exc = sys.exc_info()[:2]
return (cla.__name__, str(exc))
#
# Following "traceback" functions are adopted from PyMVPA distributed
# under MIT/Expat and copyright by PyMVPA developers (i.e. me and
# Michael). Hereby I re-license derivative work on these pieces under GPL
# to stay in line with the main Fail2Ban license
#
def mbasename(s):
"""Custom function to include directory name if filename is too common
Also strip .py at the end
"""
base = os.path.basename(s)
if base.endswith('.py'):
base = base[:-3]
if base in set(['base', '__init__']):
base = os.path.basename(os.path.dirname(s)) + '.' + base
return base
class TraceBack(object):
"""Customized traceback to be included in debug messages
"""
def __init__(self, compress=False):
"""Initialize TrackBack metric
Parameters
----------
compress : bool
if True then prefix common with previous invocation gets
replaced with ...
"""
self.__prev = ""
self.__compress = compress
def __call__(self):
ftb = traceback.extract_stack(limit=100)[:-2]
entries = [
[mbasename(x[0]), os.path.dirname(x[0]), str(x[1])] for x in ftb]
entries = [ [e[0], e[2]] for e in entries
if not (e[0] in ['unittest', 'logging.__init__']
or e[1].endswith('/unittest'))]
# lets make it more concise
entries_out = [entries[0]]
for entry in entries[1:]:
if entry[0] == entries_out[-1][0]:
entries_out[-1][1] += ',%s' % entry[1]
else:
entries_out.append(entry)
sftb = '>'.join(['%s:%s' % (mbasename(x[0]),
x[1]) for x in entries_out])
if self.__compress:
# lets remove part which is common with previous invocation
prev_next = sftb
common_prefix = os.path.commonprefix((self.__prev, sftb))
common_prefix2 = re.sub('>[^>]*$', '', common_prefix)
if common_prefix2 != "":
sftb = '...' + sftb[len(common_prefix2):]
self.__prev = prev_next
return sftb
class FormatterWithTraceBack(logging.Formatter):
"""Custom formatter which expands %(tb) and %(tbc) with tracebacks
TODO: might need locking in case of compressed tracebacks
"""
def __init__(self, fmt, *args, **kwargs):
logging.Formatter.__init__(self, fmt=fmt, *args, **kwargs)
compress = '%(tbc)s' in fmt
self._tb = TraceBack(compress=compress)
def format(self, record):
record.tbc = record.tb = self._tb()
return logging.Formatter.format(self, record)
def getLogger(name):
"""Get logging.Logger instance with Fail2Ban logger name convention
"""
if "." in name:
name = "fail2ban.%s" % name.rpartition(".")[-1]
return logging.getLogger(name)
def excepthook(exctype, value, traceback):
"""Except hook used to log unhandled exceptions to Fail2Ban log
"""
getLogger("fail2ban").critical(
"Unhandled exception in Fail2Ban:", exc_info=True)
return sys.__excepthook__(exctype, value, traceback)
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