Add mkconf command

Author: munnerz

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 }}
+`