Java Linux Network integration
This is a set extensions on Java Classes to implement and use native Linux network features.
supported features :
- TProxy based Sockets
- TunTap devices
- libnet3 integration to get network link events and information
- Basic raw packet handling
the code and units tests have been tested on 32/64 bit systems on
- Ubuntu 12.04 (32 bit)
- Ubuntu 14.04 (32/64 bit)
- OpenSuSE 13.2 & 13.3 (32/64 bit)
- CentOS/Redhat 7.0 (64 bit)
note that the JAR produced by the maven build only include native .so libraries based on the platform of your build/dev environment.
The java runtime will search for this libraries in following order (by default)
- /usr/lib/<library name>-<platform>.so - /usr/lib/jlinux-net/<library name>-<platform>.so - in jar under /<library name>-<platform>.so
by default you should just compile the jar for your platform and use that.
- java stuf : just run mvn clean install
- to build native code , you need to install some dev packages. on ubuntu this is
sudo apt-get install pkg-config build-essential openjdk-7-jdk maven2 git sudo apt-get iproute-dev libpcap0.8-dev libnl-3-dev libcap2-bin
Trusty is missing iproute-dev. iproute is replaced by iproute2 but doesn't provide the iproute2-dev packages. this is required because it includes /usr/lib/libnetlink.a which is required. I have created a update iproute2 packages in my lauchpad repository for trusty (https://launchpad.net/~luc-willems/+archive/ubuntu/backport) this is only required for building.
sudo apt-get install software-properties-common sudo add-apt-repository ppa:luc-willems/backport sudo apt-get update sudo apt-get install pkg-config build-essential git maven2 openjdk-7-jdk sudo apt-get install iproute2-dev libpcap0.8-dev libnl-3-dev libcap2-bin
opensuse 13.2: install following packages
sudo zypper in -t pattern devel_C_C++ sudo zypper in libcap-progs git java-1_7_0-openjdk-devel sudo zypper in libnl3-devel libnl-tools libnetlink-devel libpcap-devel
centos 7.0 32/64 bit:
sudo yum group install "Development Tools" sudo yum install java-1.7.0-openjdk-devel sudo yum install libnl3-devel iproute-devel libpcap-devel
WARNING about centos/redhat java : the normal java executable jre/bin/java is replaced with a rapper script which detects if abrt-java-connector is installed or not. the real location of java 7 binary is jre-abr/jre/bin/java
after you have installed the packages you can use git to clone the source repository and run following commands to build it
sudo setcap "cap_net_raw=+eip cap_net_admin=+eip" <path to your java 7 executable> git clone <url of git repository> cd JavaLinixNet sudo src/test/scripts/setup-test.sh mvn clean install
- Unit test can run on any system without changes.
- Integration test under /org/it4y/integration requires
- Linux with kernel 3.5 or better
- run the src/test/scripts/setup-test.sh before running the test.
currently IPV6 is not supported. IPv6 addresses will be ignored.
The integration test require additional capabilities or be run as root (which i would not do !!!)
To run the script as normal user, you require to
- Have a recent 3.x Linux kernel
- linux capabilities https://www.kernel.org/pub/linux/libs/security/linux-privs/kernel-2.2/capfaq-0.2.txt
- java JDK 7 or better (it will not work with jdk6)
run following command on your JDK java command
setcap "cap_net_raw=+eip cap_net_admin=+eip" <path to your java executable>
note that the must not be any symlink. it must be the final binary file. you can find this by using mvn -v command
[luc@centos7 JLinux-net]$ mvn -v Apache Maven 3.2.5 (12a6b3acb947671f09b81f49094c53f426d8cea1; 2014-12-14T18:29:23+01:00) Maven home: /home/luc/tools/maven/current Java version: 1.7.0_71, vendor: Oracle Corporation Java home: /usr/lib/jvm/java-1.7.0-openjdk-184.108.40.206-220.127.116.11.el7_0.x86_64/jre Default locale: en_US, platform encoding: UTF-8 OS name: "linux", version: "3.10.0-123.13.2.el7.x86_64", arch: "amd64", family: "unix"
You MUST read following link to understand the issues :
after upgrading java you have to repeat the setcap as this capability could get lost
When setting capabilities on the java JVM, this JVM can also be used by other java application and will have the same capabilities. This could be security risk because capabilities are given to java application , not your jars , and any user can use this jvm.
when using this , you should install your jre into a seperated JAVA_HOME and set user permissions for files and directories so execution is limited to he user which run's your application.
- allot , linux is big...