29.6 libnet: Packet Creation
and Injection Library
libnet provides an interface to craft
and inject arbitrary packets into the network. It provides both raw
socket and datalink access modes in an implementation-independent
manner.
The library hides many of the details of
crafting the IP and UDP or TCP headers, and provides simple and
portable access to writing datalink and raw packets. As with
libpcap, the library is made up of quite a number of
functions. We will show how to use a small group of the functions
for accessing raw sockets in the example in the following section,
as well as the code required to use raw sockets directly for
comparison. All the library functions begin with the
libnet_ prefix; the libnet man page and online
manual describe these functions in more detail.
The library is publicly available from http://www.packetfactory.net/libnet/.
The online manual is http://www.packetfactory.net/libnet/manual/.
As of this writing, the only manual available is for the deprecated
version 1.0; the supported version 1.1 has a significantly different API. This example uses
the 1.1 API.
|
