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main.go
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main.go
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package main
import (
"flag"
"fmt"
"net"
"net/http"
"os"
"regexp"
"strings"
"github.com/prometheus/client_golang/prometheus/promhttp"
"golang.zx2c4.com/wireguard/wgctrl"
"github.com/utilitywarehouse/semaphore-wireguard/backoff"
"github.com/utilitywarehouse/semaphore-wireguard/kube"
"github.com/utilitywarehouse/semaphore-wireguard/log"
"github.com/utilitywarehouse/semaphore-wireguard/metrics"
"k8s.io/client-go/kubernetes"
)
const (
annotationWGPublicKeyPattern = "%s.wireguard.semaphore.uw.io/pubKey"
annotationWGEndpointPattern = "%s.wireguard.semaphore.uw.io/endpoint"
wgDeviceNamePattern = "wireguard.%s"
)
var (
flagLogLevel = flag.String("log-level", getEnv("SWG_LOG_LEVEL", "info"), "Log level")
flagNodeName = flag.String("node-name", getEnv("SWG_NODE_NAME", ""), "(Required) The node on which semaphore-wireguard is running")
flagWGKeyPath = flag.String("wg-key-path", getEnv("SWG_WG_KEY_PATH", "/var/lib/semaphore-wireguard"), "Path to store and look for wg private key")
flagSWGListenAddr = flag.String("listen-address", getEnv("SWG_LISTEN_ADDRESS", ":7773"), "Listen address to serve health and metrics")
flagSWGClustersConfig = flag.String("clusters-config", getEnv("SWG_CLUSTERS_CONFIG", ""), "Path to the clusters' json config file")
bearerRe = regexp.MustCompile(`[A-Z|a-z0-9\-\._~\+\/]+=*`)
)
func usage() {
flag.Usage()
os.Exit(1)
}
func getEnv(key, defaultValue string) string {
value := os.Getenv(key)
if len(value) == 0 {
return defaultValue
}
return value
}
func main() {
flag.Parse()
log.InitLogger("semaphore-wireguard", *flagLogLevel)
if *flagNodeName == "" {
log.Logger.Error("Must specify the kube node that semaphore-wireguard runs on")
usage()
}
if *flagSWGClustersConfig == "" {
log.Logger.Error("Must specify a clusters config file location")
usage()
}
fileContent, err := os.ReadFile(*flagSWGClustersConfig)
if err != nil {
log.Logger.Error("Cannot read clusters config file", "err", err)
os.Exit(1)
}
config, err := parseConfig(fileContent)
if err != nil {
log.Logger.Error("Cannot parse clusters config", "err", err)
os.Exit(1)
}
homeClient, err := kube.ClientFromConfig(config.Local.KubeConfigPath)
if err != nil {
log.Logger.Error(
"cannot create kube client for homecluster",
"err", err,
)
os.Exit(1)
}
var runners []*Runner
var wgDeviceNames, rClusterNames []string
for _, rConf := range config.Remotes {
r, wgDeviceName, err := makeRunner(homeClient, config.Local.Name, rConf)
if err != nil {
log.Logger.Error("Failed to create runner", "err", err)
os.Exit(1)
}
wgDeviceNames = append(wgDeviceNames, wgDeviceName)
runners = append(runners, r)
rClusterNames = append(rClusterNames, rConf.Name)
go func() {
backoff.Retry(r.Run, "start runner")
}()
}
wgMetricsClient, err := wgctrl.New()
if err != nil {
log.Logger.Error("Failed to start wg client for metrics collection", "err", err)
os.Exit(1)
}
defer func() {
if err := wgMetricsClient.Close(); err != nil {
log.Logger.Error("Failed to close metrics collection wg client", "err", err)
}
}()
metrics.Register(wgMetricsClient, wgDeviceNames, rClusterNames)
listenAndServe(runners)
// Stop runners before finishing
for _, r := range runners {
r.stop <- struct{}{}
}
}
func makeRunner(homeClient kubernetes.Interface, localName string, rConf *remoteClusterConfig) (*Runner, string, error) {
data, err := os.ReadFile(rConf.RemoteSATokenPath)
if err != nil {
return nil, "", fmt.Errorf("Cannot read file: %s: %v", rConf.RemoteSATokenPath, err)
}
saToken := string(data)
if saToken != "" {
saToken = strings.TrimSpace(saToken)
if !bearerRe.Match([]byte(saToken)) {
return nil, "", fmt.Errorf("The provided token does not match regex: %s", bearerRe.String())
}
}
var remoteClient *kubernetes.Clientset
if rConf.KubeConfigPath != "" {
remoteClient, err = kube.ClientFromConfig(rConf.KubeConfigPath)
} else {
remoteClient, err = kube.Client(saToken, rConf.RemoteAPIURL, rConf.RemoteCAURL)
}
if err != nil {
return nil, "", fmt.Errorf("cannot create kube client for remotecluster %v", err)
}
_, podSubnet, err := net.ParseCIDR(rConf.PodSubnet)
if err != nil {
return nil, "", fmt.Errorf("Cannot parse remote pod subnet: %s", err)
}
wgDeviceName := fmt.Sprintf(wgDeviceNamePattern, rConf.Name)
if err := verifyInterfaceName(wgDeviceName); err != nil {
return nil, "", fmt.Errorf("Interface name validation failed for %s : %s", wgDeviceName, err)
}
r := newRunner(
homeClient,
remoteClient,
*flagNodeName,
wgDeviceName,
fmt.Sprintf("%s/%s.key", *flagWGKeyPath, wgDeviceName),
localName,
rConf.Name,
rConf.WGDeviceMTU,
rConf.WGListenPort,
podSubnet,
rConf.ResyncPeriod.Duration,
)
return r, wgDeviceName, nil
}
func listenAndServe(runners []*Runner) {
mux := http.NewServeMux()
mux.Handle("/metrics", promhttp.Handler())
mux.HandleFunc("/healthz", func(w http.ResponseWriter, _ *http.Request) {
// if we reach listenAndServe func the wg devices should have
// been intialised and running. One could use the ruuners'
// initialised flag for a liveness probe to kick the deployment
// after some time
for _, r := range runners {
if !r.initialised {
w.WriteHeader(http.StatusServiceUnavailable)
return
}
}
w.WriteHeader(http.StatusOK)
})
server := http.Server{
Addr: *flagSWGListenAddr,
Handler: mux,
}
log.Logger.Error(
"Listen and Serve",
"err", server.ListenAndServe(),
)
}