forked from cisco-app-networking/networkservicemesh
/
dns.go
103 lines (91 loc) · 3.4 KB
/
dns.go
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// Copyright (c) 2019 Cisco Systems, Inc.
//
// SPDX-License-Identifier: Apache-2.0
//
// 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 endpoint
import (
"context"
"strings"
"github.com/golang/protobuf/ptypes/empty"
"cisco-app-networking.github.io/networkservicemesh/controlplane/api/connection"
"cisco-app-networking.github.io/networkservicemesh/controlplane/api/connectioncontext"
"cisco-app-networking.github.io/networkservicemesh/controlplane/api/networkservice"
)
type addDnsConfigs struct {
dnsConfigs []*connectioncontext.DNSConfig
}
func NewAddDNSConfigs(dnsConfigs ...*connectioncontext.DNSConfig) networkservice.NetworkServiceServer {
return addDnsConfigs{dnsConfigs: dnsConfigs}
}
func (a addDnsConfigs) Request(ctx context.Context, request *networkservice.NetworkServiceRequest) (*connection.Connection, error) {
ensureDnsContextPresent(request)
dnsConfigs := request.GetConnection().GetContext().GetDnsContext().GetConfigs()
dnsConfigs = append(dnsConfigs, a.dnsConfigs...)
request.GetConnection().GetContext().GetDnsContext().Configs = dnsConfigs
if Next(ctx) != nil {
return Next(ctx).Request(ctx, request)
}
return request.GetConnection(), nil
}
func (a addDnsConfigs) Close(ctx context.Context, conn *connection.Connection) (*empty.Empty, error) {
if Next(ctx) != nil {
return Next(ctx).Close(ctx, conn)
}
return &empty.Empty{}, nil
}
type addDnsConfigDstIp struct {
searchDomains []string
}
func NewAddDnsConfigDstIp(searchDomains ...string) networkservice.NetworkServiceServer {
return &addDnsConfigDstIp{searchDomains: searchDomains}
}
func (a addDnsConfigDstIp) Request(ctx context.Context, request *networkservice.NetworkServiceRequest) (*connection.Connection, error) {
conn := request.GetConnection()
if Next(ctx) != nil {
var err error
conn, err = Next(ctx).Request(ctx, request)
if err != nil {
return nil, err
}
}
dstIp := conn.GetContext().GetIpContext().GetDstIpAddr()
if dstIp != "" {
ensureDnsContextPresent(request)
dstIp = strings.Split(dstIp, "/")[0]
dnsConfigs := conn.GetContext().GetDnsContext().GetConfigs()
dnsConfigs = append(dnsConfigs, &connectioncontext.DNSConfig{
DnsServerIps: []string{dstIp},
SearchDomains: a.searchDomains,
})
conn.GetContext().GetDnsContext().Configs = dnsConfigs
}
return conn, nil
}
func (a addDnsConfigDstIp) Close(ctx context.Context, conn *connection.Connection) (*empty.Empty, error) {
if Next(ctx) != nil {
return Next(ctx).Close(ctx, conn)
}
return &empty.Empty{}, nil
}
func ensureDnsContextPresent(request *networkservice.NetworkServiceRequest) {
if request.GetConnection() == nil {
request.Connection = &connection.Connection{}
}
if request.GetConnection().GetContext() == nil {
request.GetConnection().Context = &connectioncontext.ConnectionContext{}
}
if request.GetConnection().GetContext().GetDnsContext() == nil {
request.GetConnection().GetContext().DnsContext = &connectioncontext.DNSContext{}
}
}