LibOpenflow and OF controller

Ofctrl implements a simple openflow controller using libOpenflow.

ofapp is the interface for Applcations "Consumers" in order to receiv events from the OF-Switch such as; connected, disconnected and packet-received.

OF App implements the ConsumerInterface

type OfApp struct {
  Switch *OFSwitch
}

func (o *OfApp) PacketRcvd(sw *OFSwitch, packet *openflow13.PacketIn) {
  log.Printf("App: Received packet: %+v", packet)
}

func (o *OfApp) SwitchConnected(sw *OFSwitch) {
  log.Printf("App: Switch connected: %v", sw.DPID())

  // Store switch for later use
  o.Switch = sw
}

func (o *OfApp) SwitchDisconnected(sw *OFSwitch) {
  log.Printf("App: Switch disconnected: %v", sw.DPID())
}

func (o *OfApp) MultipartReply(sw *OFSwitch, rep *openflow13.MultipartReply) {
  log.Println(rep.Body)
}

Example:

func testExample() {

  // Main app
  var app ofctrl.OfApp

  // Create a controller
  ctrler := ofctrl.NewController(&app)

  // start listening
  ctrler.Listen(":6633")
}

Build:

We assume you already installed golang and dep. If not check the below links for more info

• install golang https://golang.org/doc/install
• install dep https://github.com/golang/dep/blob/master/docs/installation.md

To build the binary execute the ./build.sh script, it will create ofctrl binary under the $GOPATH bin directory.

Execute the ofctrl binary using the following command: $ sudo ./ofctrl