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<title>Introduction</title>
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<br><b><font size=+2>1. Introduction</font></b>
<p><font size=-1>Libnet is a C library providing a high-level interface
to packet injection primitives across many platforms. Previous to
libnet, programmers had to wrestle with confusing, obscure, and poorly
documented interfaces to build and write network packets. Libnet
alleviates these problems and provides a well documented, simple API to
quickly build portable programs that write network packets (figure 1).</font>
<center>
<p><img SRC="figure-1.gif" ALT="figure 1" height=868 width=760></center>
<p><font size=-1>Libnet was written for two main reasons:</font>
<ul>
<li>
<font size=-1>To establish a simple interface by which network programmers
could ignore the subtleties and nuances of low-level network programming
(and therefore concentrate on writing their programs and solving their
problems).</font></li>
<li>
<font size=-1>To mitigate the irritation many network programmers experienced
due to the lack of standards.</font></li>
</ul>
<font size=-1>To be honest, I can't believe someone didn't write something
like libnet (also termed "libpwrite") a long time ago. It seemed
like such an obvious gap that needed to be filled. I was sure the
<a href="http://ee.lbl.gov">LBNL</a>
guys (Lawrence Berkeley National Laboratory -- they wrote <a href="http://ee.lbl.gov">libpcap[1</a><a href="7.html">]</a>)
would put something together. Libnet, on a high level, is the packet
injector analog to libpcap. They are brothers (or sisters).</font>
<p><font size=-1>Libnet is a wonderful utility for writing security-related
applications, tools and modules. Many recent exploits have been rapidly
developed using libnet as have many security related tools. The <a href="http://www.packetfactory.net">Packetfactory</a>
has many such examples.</font>
<p><font size=-1>This manual describes libnet in detail, including library
internals and design decisions, as well as including step by step coding
examples.</font>
<p><font size=-1>The primary author of libnet is Mike D. Schiffman <mike@infonexus.com>.
However, libnet just wouldn't be libnet without the teeming masses of
<a href="contrib.html">other
way talented people</a> who have helped out.</font>
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