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fail2ban/config/filter.d/common.conf

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# Generic configuration items (to be used as interpolations) in other
# filters or actions configurations
#
# Author: Yaroslav Halchenko
#
# $Revision: $
#
[INCLUDES]
# Load customizations if any available
after = common.local
[DEFAULT]
# Daemon definition is to be specialized (if needed) in .conf file
_daemon = \S*
#
# Shortcuts for easier comprehension of the failregex
#
# PID.
# EXAMPLES: [123]
__pid_re = (?:\[\d+\])
# Daemon name (with optional source_file:line or whatever)
# EXAMPLES: pam_rhosts_auth, [sshd], pop(pam_unix)
__daemon_re = [\[\(]?%(_daemon)s(?:\(\S+\))?[\]\)]?:?
# Combinations of daemon name and PID
# EXAMPLES: sshd[31607], pop(pam_unix)[4920]
__daemon_combs_re = (?:%(__pid_re)s?:\s+%(__daemon_re)s|%(__daemon_re)s%(__pid_re)s?:)
#
# Common line prefixes (beginnings) which could be used in filters
#
# [hostname] [vserver tag] daemon_id spaces
# this can be optional (for instance if we match named native log files)
__prefix_line = \s*(?:\S+ )?(?:@vserver_\S+ )?%(__daemon_combs_re)s?\s*