mirror of https://github.com/fail2ban/fail2ban
159 lines
4.5 KiB
Plaintext
159 lines
4.5 KiB
Plaintext
__ _ _ ___ _
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/ _|__ _(_) |_ ) |__ __ _ _ _
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| _/ _` | | |/ /| '_ \/ _` | ' \
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|_| \__,_|_|_/___|_.__/\__,_|_||_|
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================================================================================
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How to develop for Fail2Ban
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================================================================================
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Fail2Ban uses GIT (http://git-scm.com/) distributed source control. This gives
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each developer their own complete copy of the entire repository. Developers can
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add and switch branches and commit changes when ever they want and then ask a
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maintainer to merge their changes.
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Fail2Ban uses GitHub (https://github.com/fail2ban/fail2ban) to manage access to
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the Git repository. GitHub provides free hosting for open-source projects as
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well as a web-based Git repository browser and an issue tracker.
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If you are familiar with Python and you have a bug fix or a feature that you
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would like to add to Fail2Ban, the best way to do so it to use the GitHub Pull
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Request feature. You can find more details on the Fail2Ban wiki
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(http://www.fail2ban.org/wiki/index.php/Get_Involved)
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Testing
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=======
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Existing tests can be run by executing `fail2ban-testcases`.
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Documentation about creating tests (when tests are required and some guidelines
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for creating good tests) will be added soon.
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Coding Standards
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================
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Coming Soon.
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Design
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======
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Fail2Ban was initially developed with Python 2.3 (IIRC). It should
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still be compatible with Python 2.4 and such compatibility assurance
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makes code ... old-fashioned in many places (RF-Note). In 0.7 the
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design went through major refactoring into client/server,
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a-thread-per-jail design which made it a bit difficult to follow.
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Below you can find a sketchy description of the main components of the
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system to orient yourself better.
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server/
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------
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Core classes hierarchy (feel welcome to draw a better/more complete
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one)::
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-> inheritance
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+ delegation
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* storage of multiple instances
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RF-Note just a note which might be useful to address while doing RF
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JailThread -> Filter -> FileFilter -> {FilterPoll, FilterPyinotify, ...}
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| * FileContainer
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+ FailManager
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+ DateDetector
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+ Jail (provided in __init__) which contains this Filter
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(used for passing tickets from FailManager to Jail's __queue)
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Server
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+ Jails
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* Jail
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+ Filter (in __filter)
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* tickets (in __queue)
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+ Actions (in __action)
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* Action
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+ BanManager
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failmanager.py
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~~~~~~~~~~~~~~
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FailManager
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Keeps track of failures, recorded as 'tickets'. All operations are
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done via acquiring a lock
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FailManagerEmpty(Exception)
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raised by FailManager.toBan after reaching the list of tickets
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(RF-Note: asks to become a generator ;) )
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filter.py
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~~~~~~~~~~
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Filter(JailThread)
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Wraps (non-threaded) FailManager (and proxies to it quite a bit),
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and provides all primary logic for processing new lines, what IPs to
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ignore, etc
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.failManager [FailManager]
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.dateDetector [DateDetector]
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.__failRegex [list]
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.__ignoreRegex [list]
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Contains regular expressions for failures and ignores
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.__findTime [numeric]
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Used in `processLineAndAdd` to skip old lines
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FileFilter(Filter):
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Files-aware Filter
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.__logPath [list]
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keeps the tracked files (added 1-by-1 using addLogPath)
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stored as FileContainer's
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.getFailures
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actually just returns
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True
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if managed to open and get lines (until empty)
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False
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if failed to open or absent container matching the filename
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FileContainer
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Adapter for a file to deal with log rotation.
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.open,.close,.readline
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RF-Note: readline returns "" with handler absent... shouldn't it be None?
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.__pos
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Keeps the position pointer
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DNSUtils
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Utility class for DNS and IP handling
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RF-Note: convert to functions within a separate submodule
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filter*.py
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~~~~~~~~~~
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Implementations of FileFilter's for specific backends. Derived
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classes should provide an implementation of `run` and usually
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override `addLogPath`, `delLogPath` methods. In run() method they all
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one way or another provide
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try:
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while True:
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ticket = self.failManager.toBan()
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self.jail.putFailTicket(ticket)
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except FailManagerEmpty:
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self.failManager.cleanup(MyTime.time())
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thus channeling "ban tickets" from their failManager to the
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corresponding jail.
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action.py
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~~~~~~~~~
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Takes care about executing start/check/ban/unban/stop commands
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