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Content Centric Networking (CCNx) - Project CCNx™ is an open source project exploring the next step in networking, based on one fundamental architectural change: replacing named hosts with named content as the primary abstraction.
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Content-Centric Networking CCNx Reference Implementation The CCNx reference implementation provides the libraries and components required to build and run applications that use and demonstrate the basic CCNx protocols for experimental and research purposes. The protocol specifications and the reference implementation are at an early research stage of development, and are released to enable collaboration with researchers. What is provided at this time is pure infrastructure, with no applications of interest. Documentation is also minimal, and so using the release software will require technical sophistication and a willingness to read the code. This work is free software; you can redistribute it and/or modify it under the terms of the appropriate licenses as covered in the file LICENSE and noted in each source file. This software is distributed in hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the file LICENSE for more information. *** Please see the file LICENSE for important licensing details and limitations. *** Please see the file NOTICES for important notices. For more information about Project CCNx, see our website at http://www.ccnx.org This file provides introductory information in the following sections: 1. Package contents 2. Supported platforms and development tools 3. Build and install instructions 4. Running the programs 5. Runtime files 6. Support and contact information ================================================== 1. Package contents ================================================== This distribution includes the following things: A) Preliminary specifications of CCNx protocol, application protocols and conventions. B) C/POSIX reference implementation of CCNx forwarder, library, primitive utilities, skeleton API docs, and unit test suite. The C implementation is required for all CCNx communication. C) Java reference implementation of library including primitive repository support (persistent storage of CCNx data), primitive utilities, skeleton API docs, and unit test suite. The Java library has more functionality implemented or started than the C library and may be an easier place to start experimenting. D) Minimal sample app (ccnChat) to demonstrate basic communication on local LAN. E) Minimal sample file proxy (ccnFileProxy) to demonstrate basic communication on local LAN. F) Experimental plugins for vlc (media transport) and wireshark (packet dissector) G) An Android implementation for smartphones. The Android implementation has a service wrapper for ccnd and the repository. It also has a CCN Chat implementation. Documentation is built from source files of various kinds (using a combination of doxygen and asciidoc) BUT the distribution includes pre-built documentation so it is not necessary to have a build environment and toolchain configured to start reading. Point your browser at doc/index.html to get started. The file tree is organized as follows: README - this file LICENSE - license terms that apply to the distribution MANIFEST - listing of every file in the distribution MD5 - MD5 sum for every file in the distribution SHA1 - SHA1 sum for every file in the distribution configure - master configure script. Note that configure scripts are hand-written at this time, not generated by autoconf doc/ - documentation tree. doc/technical - specifications doc/ccode - API documentation generated from C code doc/javacode - API documentation generated from Java code csrc/ - C code tree csrc/include/ccn - C header files csrc/lib - C application library implementation csrc/ccnd - CCN daemon, the user-space forwarder implementation csrc/libexec - connectivity utilities, especially ccndc, the ccnd configurator and connectivity agent csrc/cmd - simple command-line utilities csrc/conf - OS-specific configuration scripts etc. csrc/contrib - third-party library needed for certain platforms that are POSIX-deficient csrc/test - C test suite csrc/util - launch script support javasrc/ - Java code tree. The usual Java conventions are used for mapping package names to the file tree, with root package org.ccnx.ccn. javasrc/src - Java source tree javasrc/lib - third-party libraries javasrc/tools - convenience scripts schema - XML schema and DTD files apps - experimental/sample apps tree apps/ccnChat - simple text chat sample in Java apps/ccnFileProxy - simple proxy making local files available via CCNx apps/vlc - vlc plugin for media transport experiments apps/wireshark - wireshark plugin dissector for decoding CCNx packets experiments/multicast - scripts for running multi-machine experiments in content distribution performance over local multicast group. android/ - The Android implementaiton android/external - External libraries needed for ARM android/CCNx-Android-Lib - A common Android Library for working with CCNx android/CCNx-Android-Services - Wrappers for ccnd and repository android/apps - Android applications that use CCNx android/apps/CCNx-Android-Chat - The CCNx Chat application for Android After building, the following notable directories will appear: bin/ - command-line tools you can run, providing convenience access to mixture of C and Java utilities and samples lib/ - all libraries needed for applications (both C and Java) include/ - headers needed for applications in C javasrc/build - Java build outputs from ant (javasrc/bin is equivalent for Eclipse) Note that these directories are entirely generated and will be removed by some clean targets, so don't use them for anything you want to keep. ================================================== 2. Supported platforms ================================================== OS PLATFORMS Only Unix-like platforms are currently supported. CCNx code is tested on Ubuntu Linux, MacOS, Solaris, and FreeBSD. Some packaging for Cygwin is currently provided but is not fully supported and there is no other support for Windows platforms yet. Android is supported in the android/ tree. It only introduces minimal new code specific to the Android platform and otherwise re-uses the existing CCNx C and Java code. C LANGUAGE REQUIREMENTS AND TOOLS For parts of the system written in C, you will require a standard toolchain including gcc, make etc. and the following libraries which are not included in the distribution. libcrypto >= 0.9.8 from openssl available from http://openssl.org/source/ expat available from http://sourceforge.net/projects/expat/ libpcap available from http://www.tcpdump.org (optional, needed for certain utilities only) libxml2 available from xmlsoft.org In addition, you will need vlc and wireshark to build and use the CCNx plugins for those packages. Please see the individual README files for more information. See csrc/README* files for further notes about what needs to be installed or configured on each OS. JAVA LANGUAGE REQUIREMENTS AND TOOLS For parts of the system written in Java, CCNx code is tested with Sun Java JDK 1.5 and 1.6 only, with ant used as the canonical build tool. You will need: ant (>= 1.7.0 tested) extra libraries for JDK1.5 only (see below) Eclipse .project and .classpath files are included in the distribution so you can create Eclipse projects easily that will resolve dependencies correctly. There are three Eclipse Java projects defined: one in javasrc (Eclipse project name CCNx-Java) and one each in apps/ccnChat (Eclipse project name ccnChat) and apps/ccnFileProxy (Eclipse project name ccnFileProxy). To import one of these projects into your Eclipse workspace, choose File/Import... from the menu, open the General category in the Import dialog and select "Existing Projects into Workspace". Type in (or browse to) the appropriate directory and you should see the named Project listed and selected so you can click Finish to complete the import. Please let us know if JDK1.5 support is important to you, as we plan to eliminate it in the near future. The CCNx distribution includes JAR files for required libraries for JDK1.6. ONLY IF you are going to run on JDK1.5 you must obtain the following additional library file independently: Bouncy Castle Provider for JDK1.5: bcprov-jdk15-143.jar (http://www.bouncycastle.org/download/bcprov-jdk15-143.jar) Copy the extra JAR file into javasrc/lib, again ONLY IF you are running on JDK1.5. SPECIAL PLATFORM NOTES [Fedora] JDK1.5 on Fedora has been seen to be extremely slow at seeding the random number generator, which causes major delays for certain operations such as generating the initial keystore file. We recommend using JDK1.6 on Fedora. [Solaris] You will need to use gmake rather than make. [Android] We require the Android SDK r7 or later, because of its support for Android Libraries. Earlier releases will not compile correctly. We have tested with: Android SDK Tools, revision 7 SDK Platform Android 2.1-update1, API 7, revision 2 ================================================== 3. Build and install instructions ================================================== Note that the overall build handles both the C and Java code, so you will need to have requirements for both met in order to avoid errors. See the section above. See android/README.build for information on building for Android. BUILDING In the root directory: ./configure make The top-level build will compile both C and Java code, but not Android code. The above is sufficient to run programs locally out of bin/ and build apps referencing lib/ and include/. TESTING To run the complete test suite (both C and Java): make test MACHINE INSTALL (OPTIONAL) To install to a standard location on your machine you may also use make install FURTHER DOCUMENTATION See the notes in the Content-Centric Networking in C in the top-level documentation. ================================================== 4. Running the programs ================================================== These notes assume that you have performed the build steps listed above, but not performed a machine install. Everything may be run directly out of the build tree using programs in bin/. CCND All CCNx programs require that a ccnd be running: bin/ccndstart To start ccnd sending output to a log file instead of the terminal, set the CCND_LOG environment variable with the path of the file you want to write. Any existing file with that name will be overwritten. For a listing of other environment variables that are available (including debug message controls) run: bin/ccnd -h Note that you should not ordinarily run ccnd directly, but use the ccndstart script. For experiments on one machine it is sufficient to have a ccnd running without using a ccnd configuration file, however for multiple machine experimentation you will need to use ccndc to configure the inter-machine forwarding of interest/content. If a $HOME/.ccnx/ccnd.conf file is present then ccndstart will execute ccndc -f $HOME/.ccnx/ccnd.conf For a sample file, see csrc/libexec/ccnd.conf.sample REPOSITORY The repository provides persistent storage of CCNx content backed by a filesystem, and responds to interests in the content it has available. bin/ccn_repo will give a usage message showing options. Start a repository with the name of a directory to use for its backing store. The directory does not need to exist already, e.g.: bin/ccn_repo ~/my_ccnx_repo When launched in this way, the ccn_repo will turn into a daemon. Note the PID given in the output so you can terminate it later, e.g.: bin/ccn_repo stop 17328 Do not run two repositories on the same backing store directory at the same time. The experimental implementation has no protection to prevent this. It is sometimes very helpful to get a debug dump of the names of content held by a repository. You can do this with the command: bin/ccn_repo signal nametree OR bin/ccn_repo signal nametreewide This will produce output in a file in the repository backing directory. This file is overwritten every time you send such a signal. The repository takes an optional configuration file to control some settings, but this is not well documented at this time. See javasrc/src/org/ccnx/ccn/test/repo/origPolicy.xml for a sample. Most important is probably the <namespace> parameter which controls the CCNx name prefix which the repository will monitor. By default this is / which means that writes will be accepted for any name and reads serviced for any name for which there is content. UTILITIES There are a variety of simple utilities in bin/. Some of them have usage messages, but the handling of arguments and usage messages is inconsistent as of this release. Here are a few notable utilities: ccnexplore - primitive GUI browser in Java, usable to browse only repo content since it requires name enumeration support available only there. Also allows writing files to repo. ccnls - primitive content listing by retrieval ccnlsrepo - command-line content listing from repo (via name enumeration) ccnputfile - command-line tool to send file as CCNx data (asks repo to receive unless -raw arg given) ccngetfile - command-line tool to retrieve CCNx content and store it in file ccnchat - the ccnChat sample application ccnfileproxy - the ccnFileProxy sample application ================================================== 5. Runtime files ================================================== Beware that running the experimental software will create a variety of files, and that this list may not be complete: ~/.ccnx - per-user directory, used primarily for personal keystore and key cache ~/.rmi-server-* - per-user files Java daemon RMI interface objects. These are supposed to be cleared away automatically but that does not occur if processes are terminated manually and in other cases. Repository directories are also created if you run a repository, but in that case you must tell the program what directory to use. ================================================== 6. Support and contact information ================================================== Please see our website at http://www.ccnx.org