Add mkconf command

cmd/mkconf/main.go

@@ -0,0 +1,149 @@
+/*
+Copyright 2019 The kubewg 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 (
+ "context"
+ "flag"
+ "net"
+ "os"
+ "strings"
+ "text/template"
+
+ "k8s.io/apimachinery/pkg/runtime"
+ _ "k8s.io/client-go/plugin/pkg/client/auth/gcp"
+ "sigs.k8s.io/controller-runtime/pkg/client"
+ "sigs.k8s.io/controller-runtime/pkg/client/config"
+ logf "sigs.k8s.io/controller-runtime/pkg/runtime/log"
+
+ "github.com/munnerz/kubewg/pkg/apis"
+ wgv1alpha1 "github.com/munnerz/kubewg/pkg/apis/wg/v1alpha1"
+)
+
+var scheme = runtime.NewScheme()
+
+var (
+ privateKey = flag.String("private-key", "", "private key to use in the generated config")
+ peerName = flag.String("peer-name", "", "name of the peer to get config for")
+ peerNamespace = flag.String("peer-namespace", "", "namespace of the peer to get config for")
+)
+
+func main() {
+ flag.Parse()
+ logf.SetLogger(logf.ZapLogger(false))
+ log := logf.Log.WithName("mkconf")
+
+ log.Info("using private key", "key", *privateKey)
+ // Get a config to talk to the apiserver
+ //log.Info("setting up client for manager")
+ cfg, err := config.GetConfig()
+ if err != nil {
+ log.Error(err, "unable to set up client config")
+ os.Exit(1)
+ }
+
+ // Setup Scheme for all resources
+ //log.Info("setting up scheme")
+ if err := apis.AddToScheme(scheme); err != nil {
+ log.Error(err, "unable add APIs to scheme")
+ os.Exit(1)
+ }
+
+ cl, err := client.New(cfg, client.Options{
+ Scheme: scheme,
+ })
+ if err != nil {
+ log.Error(err, "error creating client")
+ os.Exit(1)
+ }
+
+ var p wgv1alpha1.Peer
+ if err := cl.Get(context.TODO(), client.ObjectKey{
+ Namespace: *peerNamespace,
+ Name: *peerName,
+ }, &p); err != nil {
+ log.Error(err, "error getting peer")
+ os.Exit(1)
+ }
+
+ err = generateConf(&p)
+ if err != nil {
+ log.Error(err, "error generating config")
+ os.Exit(1)
+ }
+}
+
+func generateConf(p *wgv1alpha1.Peer) error {
+ _, port, err := net.SplitHostPort(p.Spec.Endpoint)
+ if err != nil {
+ return err
+ }
+ var peers []peerData
+ for _, peer := range p.Status.Peers {
+ peers = append(peers, peerData{
+ PublicKey: peer.PublicKey,
+ AllowedIPs: strings.Join(peer.AllowedIPs, ","),
+ Endpoint: peer.Endpoint,
+ })
+ }
+ data := gotmpldata{
+ Address: p.Status.Address + "/32",
+ ListenPort: port,
+ PrivateKey: *privateKey,
+ Peers: peers,
+ }
+ t, err := template.New("peerconfig").Parse(gotmpl)
+ if err != nil {
+ return err
+ }
+
+ err = t.Execute(os.Stdout, data)
+ if err != nil {
+ return err
+ }
+
+ return nil
+}
+
+type gotmpldata struct {
+ Address string
+ ListenPort string
+ PrivateKey string
+ Peers []peerData
+}
+
+type peerData struct {
+ PublicKey string
+ AllowedIPs string
+ Endpoint string
+}
+
+var gotmpl = `[Interface]
+Address = {{.Address}}
+ListenPort = {{.ListenPort}}
+PrivateKey = {{ printf "%s" .PrivateKey}}
+
+{{ range .Peers }}
+[Peer]
+PublicKey = {{.PublicKey}}
+AllowedIPs = {{.AllowedIPs}}
+{{ if .Endpoint -}}
+Endpoint = {{ .Endpoint }}
+{{ end -}}
+PersistentKeepalive = 15
+{{ end }}
+`