Windows: Adds HCS Calls and Bug Fixes

Move the windows plugin to use the Host Compute (v2) APIs, as well
as clean-up the code. Allows win-bridge to use either the old API or Host Compute (v2) api
depending on a conf parameter. Fixes a leaked endpoint issue on windows for the v1 flow, and
removes the hns/pkg from the linux test run.

pkg/hns/netconf_windows.go

@@ -0,0 +1,152 @@
+// Copyright 2017 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 hns
+
+import (
+	"bytes"
+	"encoding/json"
+	"github.com/Microsoft/hcsshim/hcn"
+	"github.com/buger/jsonparser"
+	"github.com/containernetworking/cni/pkg/types"
+	"strings"
+)
+
+// NetConf is the CNI spec
+type NetConf struct {
+	types.NetConf
+	HcnPolicyArgs []hcn.EndpointPolicy `json:"HcnPolicyArgs,omitempty"`
+	Policies      []policy             `json:"policies,omitempty"`
+}
+
+type policy struct {
+	Name  string          `json:"name"`
+	Value json.RawMessage `json:"value"`
+}
+
+// MarshalPolicies converts the Endpoint policies in Policies
+// to HNS specific policies as Json raw bytes
+func (n *NetConf) MarshalPolicies() []json.RawMessage {
+	if n.Policies == nil {
+		n.Policies = make([]policy, 0)
+	}
+
+	result := make([]json.RawMessage, 0, len(n.Policies))
+	for _, p := range n.Policies {
+		if !strings.EqualFold(p.Name, "EndpointPolicy") {
+			continue
+		}
+
+		result = append(result, p.Value)
+	}
+
+	return result
+}
+
+// ApplyOutboundNatPolicy applies NAT Policy in VFP using HNS
+// Simultaneously an exception is added for the network that has to be Nat'd
+func (n *NetConf) ApplyOutboundNatPolicy(nwToNat string) {
+	if n.Policies == nil {
+		n.Policies = make([]policy, 0)
+	}
+
+	nwToNatBytes := []byte(nwToNat)
+
+	for i, p := range n.Policies {
+		if !strings.EqualFold(p.Name, "EndpointPolicy") {
+			continue
+		}
+
+		typeValue, err := jsonparser.GetUnsafeString(p.Value, "Type")
+		if err != nil || len(typeValue) == 0 {
+			continue
+		}
+
+		if !strings.EqualFold(typeValue, "OutBoundNAT") {
+			continue
+		}
+
+		exceptionListValue, dt, _, _ := jsonparser.Get(p.Value, "ExceptionList")
+		// OutBoundNAT must with ExceptionList, so don't need to judge jsonparser.NotExist
+		if dt == jsonparser.Array {
+			buf := bytes.Buffer{}
+			buf.WriteString(`{"Type": "OutBoundNAT", "ExceptionList": [`)
+
+			jsonparser.ArrayEach(exceptionListValue, func(value []byte, dataType jsonparser.ValueType, offset int, err error) {
+				if dataType == jsonparser.String && len(value) != 0 {
+					if bytes.Compare(value, nwToNatBytes) != 0 {
+						buf.WriteByte('"')
+						buf.Write(value)
+						buf.WriteByte('"')
+						buf.WriteByte(',')
+					}
+				}
+			})
+
+			buf.WriteString(`"` + nwToNat + `"]}`)
+
+			n.Policies[i] = policy{
+				Name:  "EndpointPolicy",
+				Value: buf.Bytes(),
+			}
+		} else {
+			n.Policies[i] = policy{
+				Name:  "EndpointPolicy",
+				Value: []byte(`{"Type": "OutBoundNAT", "ExceptionList": ["` + nwToNat + `"]}`),
+			}
+		}
+
+		return
+	}
+
+	// didn't find the policyArg, add it
+	n.Policies = append(n.Policies, policy{
+		Name:  "EndpointPolicy",
+		Value: []byte(`{"Type": "OutBoundNAT", "ExceptionList": ["` + nwToNat + `"]}`),
+	})
+}
+
+// ApplyDefaultPAPolicy is used to configure a endpoint PA policy in HNS
+func (n *NetConf) ApplyDefaultPAPolicy(paAddress string) {
+	if n.Policies == nil {
+		n.Policies = make([]policy, 0)
+	}
+
+	// if its already present, leave untouched
+	for i, p := range n.Policies {
+		if !strings.EqualFold(p.Name, "EndpointPolicy") {
+			continue
+		}
+
+		paValue, dt, _, _ := jsonparser.Get(p.Value, "PA")
+		if dt == jsonparser.NotExist {
+			continue
+		} else if dt == jsonparser.String && len(paValue) != 0 {
+			// found it, don't override
+			return
+		}
+
+		n.Policies[i] = policy{
+			Name:  "EndpointPolicy",
+			Value: []byte(`{"Type": "PA", "PA": "` + paAddress + `"}`),
+		}
+		return
+	}
+
+	// didn't find the policyArg, add it
+	n.Policies = append(n.Policies, policy{
+		Name:  "EndpointPolicy",
+		Value: []byte(`{"Type": "PA", "PA": "` + paAddress + `"}`),
+	})
+}