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main.go
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main.go
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package main
import (
"context"
"crypto/ed25519"
"crypto/rand"
"errors"
"flag"
"fmt"
"os"
"os/signal"
"runtime/debug"
"strconv"
"sync"
"syscall"
"time"
"github.com/gravitl/netmaker/auth"
"github.com/gravitl/netmaker/config"
controller "github.com/gravitl/netmaker/controllers"
"github.com/gravitl/netmaker/database"
"github.com/gravitl/netmaker/functions"
"github.com/gravitl/netmaker/logger"
"github.com/gravitl/netmaker/logic"
"github.com/gravitl/netmaker/models"
"github.com/gravitl/netmaker/mq"
"github.com/gravitl/netmaker/netclient/ncutils"
"github.com/gravitl/netmaker/servercfg"
"github.com/gravitl/netmaker/serverctl"
"github.com/gravitl/netmaker/tls"
)
var version = "dev"
// Start DB Connection and start API Request Handler
func main() {
absoluteConfigPath := flag.String("c", "", "absolute path to configuration file")
flag.Parse()
setupConfig(*absoluteConfigPath)
servercfg.SetVersion(version)
fmt.Println(models.RetrieveLogo()) // print the logo
initialize() // initial db and acls; gen cert if required
setGarbageCollection()
defer database.CloseDB()
startControllers() // start the api endpoint and mq
}
func setupConfig(absoluteConfigPath string) {
if len(absoluteConfigPath) > 0 {
cfg, err := config.ReadConfig(absoluteConfigPath)
if err != nil {
logger.Log(0, fmt.Sprintf("failed parsing config at: %s", absoluteConfigPath))
return
}
config.Config = cfg
}
}
func initialize() { // Client Mode Prereq Check
var err error
if servercfg.GetMasterKey() == "" {
logger.Log(0, "warning: MASTER_KEY not set, this could make account recovery difficult")
}
if servercfg.GetNodeID() == "" {
logger.FatalLog("error: must set NODE_ID, currently blank")
}
if err = database.InitializeDatabase(); err != nil {
logger.FatalLog("Error connecting to database")
}
logger.Log(0, "database successfully connected")
logic.SetJWTSecret()
err = logic.TimerCheckpoint()
if err != nil {
logger.Log(1, "Timer error occurred: ", err.Error())
}
var authProvider = auth.InitializeAuthProvider()
if authProvider != "" {
logger.Log(0, "OAuth provider,", authProvider+",", "initialized")
} else {
logger.Log(0, "no OAuth provider found or not configured, continuing without OAuth")
}
err = serverctl.SetDefaultACLS()
if err != nil {
logger.FatalLog("error setting default acls: ", err.Error())
}
if servercfg.IsClientMode() != "off" {
output, err := ncutils.RunCmd("id -u", true)
if err != nil {
logger.FatalLog("Error running 'id -u' for prereq check. Please investigate or disable client mode.", output, err.Error())
}
uid, err := strconv.Atoi(string(output[:len(output)-1]))
if err != nil {
logger.FatalLog("Error retrieving uid from 'id -u' for prereq check. Please investigate or disable client mode.", err.Error())
}
if uid != 0 {
logger.FatalLog("To run in client mode requires root privileges. Either disable client mode or run with sudo.")
}
if err := serverctl.InitServerNetclient(); err != nil {
logger.FatalLog("Did not find netclient to use CLIENT_MODE")
}
}
// initialize iptables to ensure gateways work correctly and mq is forwarded if containerized
if servercfg.ManageIPTables() != "off" {
if err = serverctl.InitIPTables(true); err != nil {
logger.FatalLog("Unable to initialize iptables on host:", err.Error())
}
}
if servercfg.IsDNSMode() {
err := functions.SetDNSDir()
if err != nil {
logger.FatalLog(err.Error())
}
}
genCerts()
if servercfg.IsMessageQueueBackend() {
if err = mq.ServerStartNotify(); err != nil {
logger.Log(0, "error occurred when notifying nodes of startup", err.Error())
}
}
}
func startControllers() {
var waitnetwork sync.WaitGroup
if servercfg.IsDNSMode() {
err := logic.SetDNS()
if err != nil {
logger.Log(0, "error occurred initializing DNS: ", err.Error())
}
}
//Run Rest Server
if servercfg.IsRestBackend() {
if !servercfg.DisableRemoteIPCheck() && servercfg.GetAPIHost() == "127.0.0.1" {
err := servercfg.SetHost()
if err != nil {
logger.FatalLog("Unable to Set host. Exiting...", err.Error())
}
}
waitnetwork.Add(1)
go controller.HandleRESTRequests(&waitnetwork)
}
//Run MessageQueue
if servercfg.IsMessageQueueBackend() {
waitnetwork.Add(1)
go runMessageQueue(&waitnetwork)
}
if !servercfg.IsAgentBackend() && !servercfg.IsRestBackend() && !servercfg.IsMessageQueueBackend() {
logger.Log(0, "No Server Mode selected, so nothing is being served! Set Agent mode (AGENT_BACKEND) or Rest mode (REST_BACKEND) or MessageQueue (MESSAGEQUEUE_BACKEND) to 'true'.")
}
waitnetwork.Wait()
}
// Should we be using a context vice a waitgroup????????????
func runMessageQueue(wg *sync.WaitGroup) {
defer wg.Done()
logger.Log(0, "connecting to mq broker at", servercfg.GetMessageQueueEndpoint())
var client = mq.SetupMQTT(false) // Set up the subscription listener
ctx, cancel := context.WithCancel(context.Background())
go mq.Keepalive(ctx)
quit := make(chan os.Signal, 1)
signal.Notify(quit, syscall.SIGTERM, os.Interrupt)
<-quit
cancel()
logger.Log(0, "Message Queue shutting down")
client.Disconnect(250)
}
func setGarbageCollection() {
_, gcset := os.LookupEnv("GOGC")
if !gcset {
debug.SetGCPercent(ncutils.DEFAULT_GC_PERCENT)
}
}
func genCerts() error {
logger.Log(0, "checking keys and certificates")
var private *ed25519.PrivateKey
var err error
private, err = tls.ReadKey(functions.GetNetmakerPath() + "/root.key")
if errors.Is(err, os.ErrNotExist) {
logger.Log(0, "generating new root key")
_, newKey, err := ed25519.GenerateKey(rand.Reader)
if err != nil {
return err
}
if err := tls.SaveKey(functions.GetNetmakerPath(), "/root.key", newKey); err != nil {
return err
}
private = &newKey
} else if err != nil {
return err
}
ca, err := tls.ReadCert(functions.GetNetmakerPath() + ncutils.GetSeparator() + "root.pem")
//if cert doesn't exist or will expire within 10 days --- but can't do this as clients won't be able to connect
//if errors.Is(err, os.ErrNotExist) || cert.NotAfter.Before(time.Now().Add(time.Hour*24*10)) {
if errors.Is(err, os.ErrNotExist) {
logger.Log(0, "generating new root CA")
caName := tls.NewName("CA Root", "US", "Gravitl")
csr, err := tls.NewCSR(*private, caName)
if err != nil {
return err
}
rootCA, err := tls.SelfSignedCA(*private, csr, tls.CERTIFICATE_VALIDITY)
if err != nil {
return err
}
if err := tls.SaveCert(functions.GetNetmakerPath(), ncutils.GetSeparator()+"root.pem", rootCA); err != nil {
return err
}
ca = rootCA
} else if err != nil {
return err
}
cert, err := tls.ReadCert(functions.GetNetmakerPath() + "/server.pem")
if errors.Is(err, os.ErrNotExist) || cert.NotAfter.Before(time.Now().Add(time.Hour*24*10)) {
//gen new key
logger.Log(0, "generating new server key/certificate")
_, key, err := ed25519.GenerateKey(rand.Reader)
if err != nil {
return err
}
serverName := tls.NewCName(servercfg.GetServer())
csr, err := tls.NewCSR(key, serverName)
if err != nil {
return err
}
cert, err := tls.NewEndEntityCert(*private, csr, ca, tls.CERTIFICATE_VALIDITY)
if err != nil {
return err
}
if err := tls.SaveKey(functions.GetNetmakerPath(), "/server.key", key); err != nil {
return err
}
if err := tls.SaveCert(functions.GetNetmakerPath(), "/server.pem", cert); err != nil {
return err
}
} else if err != nil {
return err
}
return nil
}