Summerschool Aachen 2004/Building Attacks Lab

Network Basics

The second lecture today will cover the basics of network programming. Here are a few links that could help you during the lab session:

• Socket Programming in Perl
• Socket Programming in Python
• A Crash Course in UNIX TCP/IP Socket Programming in C
• An Introduction to Socket Programming in C
• Libnet Packet Construction Library Developer Documentation for libnet 1.1.x, Doku from Fred
• Socket Tutorial in C
• UNIX Network Programming with many examples
• Beej's Guide to Network Programming
• Unix Socket FAQ

• Twisted, an event-driven networking framework written in Python, pdf-file
• Simple webserver in perl
• python module for libpcap
• Programming with pcap in C
• Packet Capture With libpcap and other Low Level Network Tricks
• Documentation to Net::RawIP
• Ruby/Pcap extension library
• Libnet documentation
• Search for RFCs

Linux clock timings

These show some measurements I have take on the Linux 2.4 kernel clock using gettimeofday(). This returns results with microsecond precision, so I wanted to make sure that this precision was significant. These graphs show that both the millisecond and microsecond parts give fairly uniform results.

Milliseconds
http://www.cl.cam.ac.uk/users/sjm217/volatile/timing_msec.png

Microseconds
http://www.cl.cam.ac.uk/users/sjm217/volatile/timing_msec.png

-- Steven Murdoch