Download Python for Unix and Linux System Administration by Noah Gift, Jeremy M. Jones PDF

By Noah Gift, Jeremy M. Jones

ISBN-10: 0596515820

ISBN-13: 9780596515829

Python is a perfect language for fixing difficulties, particularly in Linux and Unix networks. With this pragmatic ebook, directors can evaluation a variety of projects that frequently ensue within the administration of those platforms, and learn the way Python delivers a extra effective and no more painful option to deal with them.

every one bankruptcy in Python for Unix and Linux process Administration provides a selected administrative factor, corresponding to concurrency or facts backup, and provides Python recommendations via hands-on examples. when you end this booklet, you'll be capable of advance your personal set of command-line utilities with Python to take on a variety of difficulties. detect how this language can assist you:

* learn textual content records and extract information
* Run projects at the same time utilizing the threading and forking options
* Get details from one approach to a different utilizing community facilities
* Create clickable GUIs to deal with huge and intricate utilities
* display screen huge clusters of machines by means of interacting with SNMP programmatically
* grasp the IPython Interactive Python shell to exchange or increase Bash, Korn, or Z-Shell
* combine Cloud Computing into your infrastructure, and learn how to write a Google App Engine Application
* remedy detailed information backup demanding situations with custom-made scripts
* engage with MySQL, SQLite, Oracle, Postgres, Django ORM, and SQLAlchemy

With this ebook, you'll the way to package deal and set up your Python functions and libraries, and write code that runs both good on a number of Unix systems. You'll additionally know about numerous Python-related applied sciences that would make your existence a lot easier.

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Example text

Die Karte liest alle Pakete ein, nicht nur die, die für sie adressiert sind. Über die Variable filter wird ein PCAP-Filter gesetzt. Im Beispiel besagt dieser Filter, dass wir nur ARP-Pakete mitlesen wollen. Andere Arten von Filter wären z. B. 1 mitzulesen. org. Die Funktion open_live() öffnet eine Netzwerkkarte zum Einlesen der Pakete. Man kann Pakete auch aus einer PCAP Dump-Datei lesen, doch dazu gleich mehr. Die Parameter für open_live() sind neben dem Netzwerkinterface noch die snaplen , welche angibt, wie viele Bytes eingelesen werden sollen, ein boolscher Wert für den Promiscuous-Modus und ein Timeoutwert in Millisekunden.

Dazu übergeben wir dem jeweiligen Decoder das Paket des vorherigen Layers, also dem IPDecoder das Eth-Paket und dem TCPDecoder das IP-Paket. Mit Hilfe der Methode get_data_as_string() extrahieren wir den Payload des IP-Pakets als ASCII-String, was manchmal zu hässlichen nicht darstellbaren Zeichen führen kann, wenn man die Daten unbesorgt ausgibt, doch wir suchen mit Hilfe von regulären Ausdrücken (siehe Abschn. 9) nach Strings wie User, Pass, Password oder Login und stellen nur die Zeichen dar, die wir danach gefunden haben.

ARP-Poisoning-Angriffe kann man einerseits mit statischen ARP-Einträgen verhindern, diese werden allerdings je nach Betriebssystem und Version eventuell von ARP-Replies einfach überschrieben oder man verwendet einen Arp-Watcher (siehe Abschn. 3). Dieser teilt einem verdächtiges Verhalten im ARP-Protokoll mit, verhindert aber nicht den Angriff selbst. Die meisten modernen Intrusion-DetectionSysteme können heutzutage ebenfalls ARP-Cache-Poisoning-Angriffe erkennen und melden. Sie sollten allerdings ihre Funktionalität mit den oben beschriebenen Scripten auf die Probe stellen, um böse Überraschungen zu vermeiden.

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