OpenFlow Testing Framework
March, 2010

Warning
+++++++

This is still experimental and it requires root privilege to
control the dataplane ports.  As a consequence, there are
some serious risks to the machine on which this is running.
Use caution.

This is still preliminary work and there are bugs in the 
framework that need to be ironed out.  Please report any issues
to dtalayco@stanford.edu.

Quick Start
+++++++++++

    Make sure your switch is running and trying to connect to a
    controller on the machine where you're running oft (normally port
    6633). (We plan to add a script for the simple case of the SW
    switch running on the same host.)

    Currently, switches must be running version 1.0 of OpenFlow. 

    git clone yuba:/usr/local/git/openflow-projects/oftest
    cd <oftest>/tools/munger
    make install
    cd ../../tests
    <start your OF switch to test>
    ./oft --list
    sudo ./oft --verbose --log-file=""
    sudo ./oft --test-spec=<mod> --debug=info --platform=remote --host=...

Longer Start
++++++++++++

    1.  Pre-requisites:
        * An OF switch instance to test (see 4 below)
        * Root privilege on host
        * Python 2.5.  You can run platforms using eth interfaces with
          Python 2.4.
        * oftest checked out (to a directory called <oftest> here)
        * scapy installed:  http://www.secdev.org/projects/scapy/
        * tcpdump installed (optional, but scapy will complain if it's
          not there)
        * Doxygen and doxypy for document generation (optional)
        * lint for source checking (optional)

    2.  Build the OpenFlow Python message classes

        Important:  The OF version used by the controller is based on 
        the file in <oftest>/tools/pylibopenflow/include/openflow.h
        This is currently the 1.0 release file.

        cd <oftest>/tools/munger
        make install
        This places files in <oftest>/src/python/oftest/src and then
        calls setuptools to install on the local host

    3.  Edit configuration if necessary
        Local platforms work with veth interface pairs and default to
        four ports.  You can adjust this a bit with the command line
        parameters port_count, base_of_port and base_if_index.

        Starting from remote.py as a simple example, you can add your
        own <platform>.py file and then have it imported with
        --platform=<platform> on the command line.

    4.  Start the switch to test
        The switch must be running and actively attempting to 
        connect to the controller at the host/port specified above.

        If you're new to the test environment and want to check its 
        sanity, you can do the following.  This requires that
        your host kernel supports virtual ethernet interfaces.  This
        is best done in a window separate from where you will run oft.

        4A. Check out openflow (preferably at the same level as oftest):
            git clone git://openflowswitch.org/openflow.git
        4B. cd openflow; ./boot.sh; ./configure; make
        4C. cd ../oftest/tests
        4D. Run the switch startup script:
            sudo ./run_switch.py; Now you can run oft (see below).
        4F. Use --help to see command line switches.  Make sure you
            use the same port for the switch as for oft.
        4E. Use control-C to terminate the switch daemons.
        4F. To clean up the virtual ethernet interfaces, use
            sudo rmmod veth

    5.  Run oft
        See Warning above; requires sudo to control the dataplane
        cd <oftest>/tests
        sudo ./oft --help

OFT Command Line Options
++++++++++++++++++++++++

    Here is a summary of the oft command line options.  Use --help to see
    the long and short command option names.

    platform          : String identifying the target platform
    controller_host   : Host on which test controller is running (for sockets)
    controller_port   : Port on which test controller listens for switch cxn
    port_count        : Number of ports in dataplane
    base_of_port      : Base OpenFlow port number in dataplane
    base_if_index     : Base OS network interface for dataplane
    test_dir          : Directory to search for test files (default .)
    test_spec         : Specification of test(s) to run
    log_file          : Filename for test logging
    list              : Boolean:  List all tests and exit
    debug             : String giving debug level (info, warning, error...)
    verbose           : Same as debug=verbose

Overview
++++++++

    The directory structure is currently:

     <oftest>
         `
         |-- doc
         |-- src
         |   `-- python
         |       `-- oftest
         |-- tests
         |   `-- oft and files with test cases
         `-- tools
             |-- munger
             `-- pylibopenflow

    The tools directory is what processes the OpenFlow header
    files to produce Python classes representing OpenFlow messages.
    The results are placed in src/python/oftest and currently
    include:

        message.py:      The main API providing OF message classes
        error.py:        Subclasses for error messages
        action.py:       Subclasses for action specification
        cstruct.py:      Direct representation of C structures in Python
        class_maps.py:   Addition info about C structures

    In addition, the following Python files are present in 
    src/python/oftest:

        controller.py:   The controller representation
        dataplane.py:    The dataplane representation
        action_list.py:  Action list class
        netutils.py:     e.g., set promisc on sockets
        ofutils.py:      Utilities related to OpenFlow messages
        oft_assert.py:   Test framework level assertion

    Tests are run from the tests directory.  The file oft is the
    top level entry point for tests.  Try ./oft --help for some more.

Important Notes
+++++++++++++++

    1.  If you edit any of the files in src/python/oftest or any of the
    scripts in tools/munger/scripts, you MUST re-run make install.  This
    is easy to forget.

    2.  If your running into issues with transactions, and it appears that
    OpenFlow messages aren't quite right, start by looking at any length
    fields in the packets.  With the local platform, you can use wireshark
    on the loopback interface as well as the dataplane veth interfaces.

Adding Your Own Test Cases
++++++++++++++++++++++++++

    You can:

        * Add cases to an existing file
        * Add a new file

    If you add cases to an existing file, each case should be its own
    class.  It must inherit from unittest.TestCase or one of its 
    derivatives and define runTest (that's how test cases are discovered).

    If you add a new file, it must implement a top level function called
    test_set_init which takes a configuration dictionary.  See basic.py
    for an example.  The main point of this is to pass the port map 
    object to the test cases.  But you can access any configuration
    parameters this way.  Each test case in the new file must derive
    from unittest.TestCase.

    CONVENTIONS:

    The first line of the doc string for a file and for a test class is 
    displayed in the list command.  Please keep it clear and under 50
    characters.


Using CentOS/RHEL
+++++++++++++++++

    CentOS/RHEL have two challenges:  they are very tied to Python 2.4
    (and Scapy requires Python 2.5 for its latest version) and they
    require a kernel upgrade to use veth pairs for local platform
    testing.  

    If you only need to control eth interfaces for a remote platform,
    you can use CentOS/RHEL without major disruption.  The key is to 
    download scapy-1.2 from the following link:

    wget http://hg.secdev.org/scapy/raw-file/v1.2.0.2/scapy.py

    See: http://www.dirk-loss.de/scapy-doc/installation.html#installing-scapy-v1-2
    for more info.

    Copy scapy.py to /usr/lib/python2.4/site-packages

    If you hit an error related to importing scapy.all, you just need
    to change the import to refer to scapy (not scapy.all).  See
    examples in parse.py for example.


Other Info
++++++++++

    * Build doc with
      + cd <oftest>/tools/munger
      + make doc
    Places the results in <oftest>/doc/html

    * Run lint on sources
      + cd <oftest>/tools/munger
      + make lint
    Places results in <oftest>/lint/*.log
    The file controller.log currently has some errors indicated


To Do
+++++

    * Need to have an overview of the components of the test, how they
      connect and how they are managed by the test framework.
    * See the Regression Test component on trac:
      http://www.openflowswitch.org/bugs/openflow
      http://www.openflowswitch.org/bugs/openflow/query?component=Regression+test+suite

    * Make the framework work with OF versions other than 1.0?