control WANproxy through python openflow controller.

[Boxiang Pan]

Hi, Juli,

Thank you so much for all the help. That was very helpful!


On Sat, Mar 2, 2013 at 9:35 AM, Juli Mallett <juli at clockworksquid.com>wrote:

> Boxiang,
>
> With the changes I've made to the configuration system internally
> (configuration files should still be the same), I think you'll have an
> easier time seeing now how to create a proxy instance.  Look at
> wanproxy_config_class_proxy.cc, namely.
>
> You'd want to do something like:
>
> new ProxyListener(co->name_, interface_codec, peer_codec,
> interface->family_, interface_address, peer->family_, peer_address);
>
> Where co->name_ is a string giving a name to this proxy instance.
>
> interface_codec is a pointer to a WANProxyCodec structure, which you
> can see in wanproxy_codec.h; just create an XCodec instance if you
> need one, and set compression options.  Likewise for peer_codec.
>
> interface->family_ gives the address family; you probably want
> SocketAddressFamilyIP, or maybe SocketAddressFamilyIPv4 if you know
> it's IPv4, etc.  Same for peer->family_.
>
> interface_address and peer_address are both strings.
> interface_address is the address to listen on, and peer_address is the
> address to connect to.  So interface_address might be something like
> "[0.0.0.0]:4290" to listen on port 4290 of all IPv4 interfaces.  And
> then peer_address might be "[10.10.0.90]:4390" to connect to port 4390
> on 10.10.0.90.
>
> Note that the address strings do not need the brackets if they are not
> IPv6 addresses, but I tend to use them anyway.  You can also use DNS
> names instead, e.g. "wanproxy1.co.us.example.com:4390" if your peer
> has a hostname associated with it.
>
> I hope that's enough for you; let me know if you need something more.
>
> Thanks,
> Juli.
>
> On Tue, Feb 19, 2013 at 12:47 AM, Boxiang Pan <aquarypbx at gmail.com> wrote:
> > Hi, Juli,
> >
> > We really appreciate your quick reply. Yes, it will be very helpful for
> us
> > if you could provide sample code for creating a proxy instance with C++,
> and
> > the interface code where we may use python to call.  I don't really
> > understand what you mean by "simple binary protocol over TCP, inject
> > configuration over TCP", do you mean sending the conf files over TCP to
> > WANProxy instances?
> >
> > For now, I think starting wanproxy from python is enough for us, we don't
> > need to worry about control at this time.
> >
> > Details about our code flow:
> >
> > So we have a open flow controller that runs on a VM and rest of the
> networks
> > can be tenants (or clients). Clients establish a tcp connection and send
> a
> > service request via configuration file over TCP to the controller
> describing
> > the type of functionality they want to avail (in our case its WANProxy)
> and
> > also will tell a network path (or a set of switches) over which client
> wants
> > the reservations to be made. This request is handled by an allocator
> which
> > takes all the parameters from config file, passes the control to a
> module(we
> > have to implement this) which will need to communicate with WANProxy
> > (already installed on the switches in network path) and make the
> necessary
> > reservations. Once this set up is done, we will repeatedly send same
> large
> > file to measure the performance of WANProxy.
> >
> > What interface code do you think might be necessary?
> >
> > Thank you very much.
> >
> > On Sun, Feb 17, 2013 at 4:56 PM, Juli Mallett <juli at clockworksquid.com>
> > wrote:
> >>
> >> Boxiang,
> >>
> >> Very excited to hear about your project.
> >>
> >> Really, if you're willing to write some bindings for the C++ code,
> >> it's probably better to entirely do without the configuration system
> >> if you're at all interested in scripting WANProxy.
> >>
> >> You would want to look at the ProxyListener and SSHProxyListener
> >> classes right now; creating one of those is what creates a proxy
> >> instance, and then you need only call 'event_main()' to get things off
> >> and running.  I can provide sample code for creating a proxy instance
> >> (SSH or otherwise) with C++ code instead of a config file if that
> >> would be helpful for you.
> >>
> >> The drawback to that is that if I change anything in WANProxy, there's
> >> a possibility that your bindings would need updated.  I could also
> >> provide a simple binary protocol over TCP for creating proxy
> >> instances, or even set up a listener that allows one to inject
> >> configuration over TCP.
> >>
> >> Control is a trickier question.  Right now there's little in the way
> >> of statistics and reporting; you can't even easily get a list of
> >> current connections being proxied.  What kinds of control do you need?
> >>  It may be that I can point you to something that's working right now,
> >> or it may be that I need to add some code to provide an interface for
> >> your project.
> >>
> >> Thanks,
> >> Juli.
> >>
> >> On Sun, Feb 17, 2013 at 1:00 PM, Boxiang Pan <bopan at ucsd.edu> wrote:
> >> > Hi,
> >> >
> >> > We are a group of graduate students from UCSD, and we are working on a
> >> > class
> >> > project using WANProxy. Our goal is to be able to start and control
> >> > WANProxy
> >> > from an openflow based controller written in python. We already have
> the
> >> > openflow controller in python, and we would like to let it "talk" to
> >> > WANProxy. So instead of directly type "wanproxy -c client.conf" in the
> >> > terminal, we hope to type in a command in the openflow controller, and
> >> > then
> >> > let it start/control the WANProxy. We'd appreciate it very much if you
> >> > could
> >> > give us some guideline on how to integrate WANProxy with openflow
> >> > controller, specifically which parts of the code in WANProxy are the
> >> > interface/API that we should study? And what is the best tool to wrap
> >> > WANProxy into python?
> >> >
> >> > Thank you for your help and suggestions.
> >> >
> >> > --
> >> >
> >> > Boxiang Pan
> >> >
> >>
> >> --
> >>
> >> Boxiang Pan
> >>
> >> Department of Electrical and Computer Engineering
> >> University of California, San Diego
> >> Tel: 858-999-7655
> >>
> >>
> >
>



-- 
潘博翔
Boxiang Pan

Department of Electrical and Computer Engineering
University of California, San Diego
Tel: 858-999-7655
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