Compiling on Red Hat Enterprise version, requires few extra step in order to install the neccessary build environment.

In addtion Red Hat Enterprise Linux version 4 uses fairely old version of libpcap (version 0.8.3) which is below standard requirements of jNetPcap installations. However in order to provide support on these still common platforms in production environments, RHEL installations have a lower requirement for libpcap. Libpcap versions below 0.9.7 do not provide support for 2 functions: pcap_injet and pcap_sendpacket. These functions are ommitted from jNetPcap API. When using jNetPcap API, you can check if these 2 functions are supported with methods: Pcap.isPacketInjectSupported() and Pcap.isPacketSendSupported().

The following packages and their dependencies need to be installed for a build environment neccessary to compile jNetPcap software:

redhat> uname -a

redhat> rpm -q libpcap jdk gcc-c++ ant ant-nodeps subversion junit rpm-devel

Some of these packages are not easy to aquire for red-hat platforms. The rpms can be either downloaded manually or using an installer such as yum.

Installing Sun's java JDK

You have to download the linux distribution manually from http://java.sun.com. The self extracting and installing package is very easy to install.

If there is already a java environment installed you need to setup alternatives to Sun's JDK.

Note: you can specify a specific version of JDK if more then one is installed to alternatives in the /usr/java directory.

Installing using up2date

Some of the above packages can be installed from local RHEL CD or from one of the RHN channels.

• up2date subversion
• up2date gcc-c++
• up2date libpcap
• up2date rpm-devel

Installing YUM on red-hat EL version 4

The remaing packages are easiest to install from jpackage.org yum repository.

You can skip this step if you already have yum installed and configured. Otherwise we have to download yum package and its prerequisites manually.

cd /tmp
mkdir yum
cd yum

wget http://dag.wieers.com/rpm/packages/yum/yum-2.4.2-0.4.el4.rf.noarch.rpm
wget http://dag.wieers.com/rpm/packages/python-elementtree/python-elementtree...
wget http://dag.wieers.com/rpm/packages/sqlite/sqlite-2.8.17-1.el4.rf.i386.rpm
wget http://dag.wieers.com/rpm/packages/python-urlgrabber/python-urlgrabber-2...

rpm -iv python-elementtree-1.2.6-7.el4.rf.i386.rpm
rpm -iv sqlite-2.8.17-1.el4.rf.i386.rpm
rpm -iv python-sqlite-1.0.1-1.2.el4.rf.i386.rpm
rpm -iv python-urlgrabber-2.9.7-1.2.el4.rf.noarch.rpm
rpm -iv yum-2.4.2-0.4.el4.rf.noarch.rpm

Next we need to configure yum for jpackage.org repository which contains all the required java-noarch type packages. You would replace or append to (if you already have a working yum configuration) the /etc/yum.conf configuration file with the following:

/etc/yum.conf

Now we are ready to install various no-arch type packages needed by jNetPcap.

Installing remaining packages using yum

This would be quiet easy step now if it weren't for a gatcha. The ant package distributed with jpackage.org (usually have jpp somewhere in the name) has a bug (yes this is a reported bug by many) that has a prerequisite requirement for sun-devel. This requirement comes from installation on a SULinux and is not applicable for red hat linuxes, since no such package exists anywhere. Therefore what you need to do is install ant package prerequisites first using yum. The manually download the ant package and install it using rpm and force it to not do dependency check.

Here are ant dependencies:

Notice that java-devl is an unsatisfied dependency. This is a report bug with the packaging. It apparently had been removed as a requirement and then put back. So we have to install the dependencies first in a separate step:

Next we manually download the ant rpm from jpackage.org repository and install it using rpm:

After ANT has been installed, you need to check and make sure that Sun's JDK hadn't been removed during this entire process. If it has, you need to re-install it.

Now we install the remaining packages:

Checkout source code and compile

After the environment is setup, you should now be able to checkout the source code and perform builds.

• Checkout source code
  
  svn co https://jnetpcap.svn.sourceforge.net/svnroot/jnetpcap/jnetpcap/trunk jnetpcap
• As root run jUnit testcases:
  
  su
ant clean test
exit
• ant -Dos=rhel4 clean package-rpm

Installing packages manually (not recommended)

It is possible to install the remaining packages manually. It is however much easier using yum (see installing using yum section).

To install manually you have to download manually all the require packages to your local system and then install using rpm command.

You can install all the packages from jpackage repository which contains most of the java based packages for various OSes. The web URL to the respository is

The packages are organized alphabetically and you can click on the first letter of the package from a menu at the top of the page. All of the above specified packages need to be download and installed using rpm command. It is however not easy manually to figure out what all the inter-dependencies are, but its not impossible.

Below is an attempt to list some of the dependencies by these various packages. Note that some of the dependencies can go to deeper level, but atleast here are the top-level dependencies:

ant package

ant-nodeps package

junit package

ant-junit package

And here are the second level dependencies for all the dependencies of the ant package:

Like I said, trying to resolve all of these dependencies can get quiet difficult rather quickly. None the less I have provided as much data as I can to help your resolve these dependencies manually.