Add static CNI plugin

This changes to add 'static' CNI plugin, which provides to assign
IPv4/v6 address statically from given config file. See README.md
for the details.

plugins/ipam/static/static_test.go

@@ -0,0 +1,161 @@
+// Copyright 2018 CNI authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package main
+
+import (
+	"net"
+	"strings"
+
+	"github.com/containernetworking/cni/pkg/skel"
+	"github.com/containernetworking/cni/pkg/types"
+	"github.com/containernetworking/cni/pkg/types/current"
+	"github.com/containernetworking/plugins/pkg/testutils"
+
+	. "github.com/onsi/ginkgo"
+	. "github.com/onsi/gomega"
+)
+
+var _ = Describe("static Operations", func() {
+	It("allocates and releases addresses with ADD/DEL", func() {
+		const ifname string = "eth0"
+		const nspath string = "/some/where"
+
+		conf := `{
+			"cniVersion": "0.3.1",
+			"name": "mynet",
+			"type": "ipvlan",
+			"master": "foo0",
+			"ipam": {
+				"type": "static",
+				"addresses": [ {
+						"address": "10.10.0.1/24",
+						"gateway": "10.10.0.254"
+					},
+					{
+						"address": "3ffe:ffff:0:01ff::1/64",
+						"gateway": "3ffe:ffff:0::1"
+					}],
+				"routes": [
+					{ "dst": "0.0.0.0/0" },
+					{ "dst": "192.168.0.0/16", "gw": "10.10.5.1" },
+					{ "dst": "3ffe:ffff:0:01ff::1/64" }],
+				"dns": {
+					"nameservers" : ["8.8.8.8"],
+					"domain": "example.com",
+					"search": [ "example.com" ]
+				}
+			}
+		}`
+
+		args := &skel.CmdArgs{
+			ContainerID: "dummy",
+			Netns:       nspath,
+			IfName:      ifname,
+			StdinData:   []byte(conf),
+		}
+
+		// Allocate the IP
+		r, raw, err := testutils.CmdAddWithResult(nspath, ifname, []byte(conf), func() error {
+			return cmdAdd(args)
+		})
+		Expect(err).NotTo(HaveOccurred())
+		Expect(strings.Index(string(raw), "\"version\":")).Should(BeNumerically(">", 0))
+
+		result, err := current.GetResult(r)
+		Expect(err).NotTo(HaveOccurred())
+
+		// Gomega is cranky about slices with different caps
+		Expect(*result.IPs[0]).To(Equal(
+			current.IPConfig{
+				Version: "4",
+				Address: mustCIDR("10.10.0.1/24"),
+				Gateway: net.ParseIP("10.10.0.254"),
+			}))
+
+		Expect(*result.IPs[1]).To(Equal(
+			current.IPConfig{
+				Version: "6",
+				Address: mustCIDR("3ffe:ffff:0:01ff::1/64"),
+				Gateway: net.ParseIP("3ffe:ffff:0::1"),
+			},
+		))
+		Expect(len(result.IPs)).To(Equal(2))
+
+		Expect(result.Routes).To(Equal([]*types.Route{
+			{Dst: mustCIDR("0.0.0.0/0")},
+			{Dst: mustCIDR("192.168.0.0/16"), GW: net.ParseIP("10.10.5.1")},
+			{Dst: mustCIDR("3ffe:ffff:0:01ff::1/64")},
+		}))
+
+		// Release the IP
+		err = testutils.CmdDelWithResult(nspath, ifname, func() error {
+			return cmdDel(args)
+		})
+		Expect(err).NotTo(HaveOccurred())
+	})
+
+	It("doesn't error when passed an unknown ID on DEL", func() {
+		const ifname string = "eth0"
+		const nspath string = "/some/where"
+
+		conf := `{
+			"cniVersion": "0.3.0",
+			"name": "mynet",
+			"type": "ipvlan",
+			"master": "foo0",
+			"ipam": {
+				"type": "static",
+				"addresses": [ {
+					"address": "10.10.0.1/24",
+					"gateway": "10.10.0.254"
+				},
+				{
+					"address": "3ffe:ffff:0:01ff::1/64",
+					"gateway": "3ffe:ffff:0::1"
+				}],
+				"routes": [
+				{ "dst": "0.0.0.0/0" },
+				{ "dst": "192.168.0.0/16", "gw": "10.10.5.1" },
+				{ "dst": "3ffe:ffff:0:01ff::1/64" }],
+				"dns": {
+					"nameservers" : ["8.8.8.8"],
+					"domain": "example.com",
+					"search": [ "example.com" ]
+				}}}`
+
+		args := &skel.CmdArgs{
+			ContainerID: "dummy",
+			Netns:       nspath,
+			IfName:      ifname,
+			StdinData:   []byte(conf),
+		}
+
+		// Release the IP
+		err := testutils.CmdDelWithResult(nspath, ifname, func() error {
+			return cmdDel(args)
+		})
+		Expect(err).NotTo(HaveOccurred())
+	})
+})
+
+func mustCIDR(s string) net.IPNet {
+	ip, n, err := net.ParseCIDR(s)
+	n.IP = ip
+	if err != nil {
+		Fail(err.Error())
+	}
+
+	return *n
+}