Exemple #1
0
func newNode(commands ...string) {
	switch commands[0] {
	case "host":
		var name string
		if len(commands) == 2 {
			name = commands[1]
		}

		h, err := mn.NewHost(name)
		if err != nil {
			log.Println(err)
			return
		}

		fmt.Println("Host", h.NodeName(), "created")
		scheme.AddNode(h)

	case "router":
		var name string
		if len(commands) == 2 {
			name = commands[1]
		}

		h, err := mn.NewRouter(name)
		if err != nil {
			log.Println(err)
			return
		}

		fmt.Println("Host", h.NodeName(), "created")
		scheme.AddNode(h)

	case "switch":
		var name string
		if len(commands) == 2 {
			name = commands[1]
		}

		s, err := mn.NewSwitch(name)
		if err != nil {
			log.Println(err)
			return
		}

		fmt.Println("Switch", s.NodeName(), "created")

		scheme.AddNode(s)
		names = append(names, s.NodeName())

	case "link":
		var left, right mn.Link

		args := commands[1:]
		if len(args) < 2 {
			log.Println("At least two nodes required, e.g.: new link a,b")
			return
		}

		n1 := args[0]
		n2 := args[1]

		if len(args) >= 3 && args[2] != "" {
			if err := json.Unmarshal([]byte(args[2]), &left); err != nil {
				log.Println(err)
				return
			}
		}

		if len(args) >= 4 && args[3] != "" {
			if err := json.Unmarshal([]byte(args[3]), &right); err != nil {
				log.Println(err)
				return
			}
		}

		node1, found := scheme.GetNode(n1)
		if !found {
			log.Println("No such node:", n1, "create it first")
			return
		}

		node2, found := scheme.GetNode(n2)
		if !found {
			log.Println("No such node:", n2, "create it first")
			return
		}

		pair := mn.NewLink(node1, node2, left, right)

		if err := pair.Create(); err != nil {
			log.Println("Unable to create pair:", err)
			return
		}

		pair, err := pair.Up()
		if err != nil {
			log.Println("Can't bring it up,", err)
		}

		node1.AddLink(pair.Left)
		node2.AddLink(pair.Right)

		if pair.IsPatch() {
			fmt.Println("[Patch]", node1.NodeName(), "<--->", node2.NodeName())
		}

		return
	}
}
Exemple #2
0
func main() {
	// creating and instance of Scheme struct, which is just a
	// a storage for futher nodes
	scheme := mn.NewScheme()

	defer scheme.Release()

	// create new host h1
	host1, err := mn.NewHost("h1")
	if err != nil {
		panic(err)
	}

	// create new switch with random name
	sw, err := mn.NewSwitch()
	if err != nil {
		panic(err)
	}

	// interconnect nodes
	pair := mn.NewLink(sw, host1, mn.Link{Cidr: "noip"}, mn.Link{Cidr: "192.168.44.1/24"})

	// physically create link
	if err := pair.Create(); err != nil {
		panic(err)
	}

	// apply cidr, routes, bring interfaces up
	pair, err = pair.Up()
	if err != nil {
		panic(err)
	}

	sw.AddLink(pair.Left)
	host1.AddLink(pair.Right)

	scheme.AddNode(host1)
	scheme.AddNode(sw)

	// repeat for host2

	host2, err := mn.NewHost("h2")
	if err != nil {
		panic(err)
	}

	pair2 := mn.NewLink(sw, host2, mn.Link{Cidr: "noip"}, mn.Link{Cidr: "192.168.44.2/24"})
	if err := pair2.Create(); err != nil {
		panic(err)
	}
	pair2, err = pair2.Up()
	if err != nil {
		panic(err)
	}

	sw.AddLink(pair2.Left)
	host2.AddLink(pair2.Right)

	scheme.AddNode(host2)

	// now we can run some command

	host1.RunProcess("ping", "-c1", "192.168.44.2")

	time.Sleep(time.Second * 1)
}