mirror of
https://github.com/gravitl/netmaker.git
synced 2024-09-23 00:36:40 +08:00
216 lines
6.9 KiB
Go
216 lines
6.9 KiB
Go
package functions
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import (
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"context"
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"encoding/json"
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"errors"
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"fmt"
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"net"
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"os"
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"strconv"
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"sync"
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"time"
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"github.com/cloverstd/tcping/ping"
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"github.com/gravitl/netmaker/logger"
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"github.com/gravitl/netmaker/models"
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"github.com/gravitl/netmaker/netclient/auth"
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"github.com/gravitl/netmaker/netclient/config"
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"github.com/gravitl/netmaker/netclient/ncutils"
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"github.com/gravitl/netmaker/tls"
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)
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// Checkin -- go routine that checks for public or local ip changes, publishes changes
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// if there are no updates, simply "pings" the server as a checkin
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func Checkin(ctx context.Context, wg *sync.WaitGroup) {
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logger.Log(2, "starting checkin goroutine")
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defer wg.Done()
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for {
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select {
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case <-ctx.Done():
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logger.Log(0, "checkin routine closed")
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return
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//delay should be configuraable -> use cfg.Node.NetworkSettings.DefaultCheckInInterval ??
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case <-time.After(time.Second * 60):
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checkin()
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}
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}
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}
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func checkin() {
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networks, _ := ncutils.GetSystemNetworks()
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logger.Log(3, "checkin with server(s) for all networks")
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for _, network := range networks {
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var nodeCfg config.ClientConfig
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nodeCfg.Network = network
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nodeCfg.ReadConfig()
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// check for nftables present if on Linux
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if ncutils.IsLinux() {
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if ncutils.IsNFTablesPresent() {
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nodeCfg.Node.FirewallInUse = models.FIREWALL_NFTABLES
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} else {
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nodeCfg.Node.FirewallInUse = models.FIREWALL_IPTABLES
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}
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} else {
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// defaults to iptables for now, may need another default for non-Linux OSes
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nodeCfg.Node.FirewallInUse = models.FIREWALL_IPTABLES
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}
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if nodeCfg.Node.IsStatic != "yes" {
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extIP, err := ncutils.GetPublicIP(nodeCfg.Server.API)
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if err != nil {
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logger.Log(1, "error encountered checking public ip addresses: ", err.Error())
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}
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if nodeCfg.Node.Endpoint != extIP && extIP != "" {
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logger.Log(1, "network:", nodeCfg.Node.Network, "endpoint has changed from ", nodeCfg.Node.Endpoint, " to ", extIP)
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nodeCfg.Node.Endpoint = extIP
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if err := PublishNodeUpdate(&nodeCfg); err != nil {
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logger.Log(0, "network:", nodeCfg.Node.Network, "could not publish endpoint change")
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}
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}
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intIP, err := getPrivateAddr()
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if err != nil {
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logger.Log(1, "network:", nodeCfg.Node.Network, "error encountered checking private ip addresses: ", err.Error())
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}
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if nodeCfg.Node.LocalAddress != intIP && intIP != "" {
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logger.Log(1, "network:", nodeCfg.Node.Network, "local Address has changed from ", nodeCfg.Node.LocalAddress, " to ", intIP)
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nodeCfg.Node.LocalAddress = intIP
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if err := PublishNodeUpdate(&nodeCfg); err != nil {
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logger.Log(0, "Network: ", nodeCfg.Node.Network, " could not publish local address change")
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}
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}
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_ = UpdateLocalListenPort(&nodeCfg)
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} else if nodeCfg.Node.IsLocal == "yes" && nodeCfg.Node.LocalRange != "" {
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localIP, err := ncutils.GetLocalIP(nodeCfg.Node.LocalRange)
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if err != nil {
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logger.Log(1, "network:", nodeCfg.Node.Network, "error encountered checking local ip addresses: ", err.Error())
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}
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if nodeCfg.Node.Endpoint != localIP && localIP != "" {
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logger.Log(1, "network:", nodeCfg.Node.Network, "endpoint has changed from "+nodeCfg.Node.Endpoint+" to ", localIP)
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nodeCfg.Node.Endpoint = localIP
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if err := PublishNodeUpdate(&nodeCfg); err != nil {
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logger.Log(0, "network:", nodeCfg.Node.Network, "could not publish localip change")
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}
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}
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}
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Hello(&nodeCfg)
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checkCertExpiry(&nodeCfg)
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}
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}
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// PublishNodeUpdates -- saves node and pushes changes to broker
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func PublishNodeUpdate(nodeCfg *config.ClientConfig) error {
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if err := config.Write(nodeCfg, nodeCfg.Network); err != nil {
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return err
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}
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data, err := json.Marshal(nodeCfg.Node)
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if err != nil {
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return err
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}
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if err = publish(nodeCfg, fmt.Sprintf("update/%s", nodeCfg.Node.ID), data, 1); err != nil {
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return err
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}
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logger.Log(0, "network:", nodeCfg.Node.Network, "sent a node update to server for node", nodeCfg.Node.Name, ", ", nodeCfg.Node.ID)
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return nil
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}
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// Hello -- ping the broker to let server know node it's alive and well
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func Hello(nodeCfg *config.ClientConfig) {
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if err := publish(nodeCfg, fmt.Sprintf("ping/%s", nodeCfg.Node.ID), []byte(ncutils.Version), 0); err != nil {
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logger.Log(0, fmt.Sprintf("Network: %s error publishing ping, %v", nodeCfg.Node.Network, err))
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logger.Log(0, "running pull on "+nodeCfg.Node.Network+" to reconnect")
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_, err := Pull(nodeCfg.Node.Network, true)
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if err != nil {
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logger.Log(0, "could not run pull on "+nodeCfg.Node.Network+", error: "+err.Error())
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}
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} else {
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logger.Log(3, "checkin for", nodeCfg.Network, "complete")
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}
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}
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// node cfg is required in order to fetch the traffic keys of that node for encryption
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func publish(nodeCfg *config.ClientConfig, dest string, msg []byte, qos byte) error {
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// setup the keys
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trafficPrivKey, err := auth.RetrieveTrafficKey(nodeCfg.Node.Network)
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if err != nil {
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return err
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}
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serverPubKey, err := ncutils.ConvertBytesToKey(nodeCfg.Node.TrafficKeys.Server)
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if err != nil {
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return err
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}
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client, err := setupMQTT(nodeCfg, true)
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if err != nil {
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return fmt.Errorf("mq setup error %w", err)
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}
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defer client.Disconnect(250)
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encrypted, err := ncutils.Chunk(msg, serverPubKey, trafficPrivKey)
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if err != nil {
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return err
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}
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if token := client.Publish(dest, qos, false, encrypted); !token.WaitTimeout(30*time.Second) || token.Error() != nil {
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logger.Log(0, "could not connect to broker at "+nodeCfg.Server.Server+":"+nodeCfg.Server.MQPort)
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var err error
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if token.Error() == nil {
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err = errors.New("connection timeout")
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} else {
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err = token.Error()
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}
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if err != nil {
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return err
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}
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}
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return nil
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}
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func checkCertExpiry(cfg *config.ClientConfig) error {
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cert, err := tls.ReadCertFromFile(ncutils.GetNetclientServerPath(cfg.Server.Server) + ncutils.GetSeparator() + "client.pem")
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//if cert doesn't exist or will expire within 10 days
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if errors.Is(err, os.ErrNotExist) || cert.NotAfter.Before(time.Now().Add(time.Hour*24*10)) {
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key, err := tls.ReadKeyFromFile(ncutils.GetNetclientPath() + ncutils.GetSeparator() + "client.key")
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if err != nil {
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return err
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}
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return RegisterWithServer(key, cfg)
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}
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if err != nil {
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return err
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}
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return nil
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}
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func checkBroker(broker string, port string) error {
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if broker == "" {
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return errors.New("error: broker address is blank")
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}
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if port == "" {
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return errors.New("error: broker port is blank")
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}
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_, err := net.LookupIP(broker)
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if err != nil {
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return errors.New("nslookup failed for broker ... check dns records")
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}
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pinger := ping.NewTCPing()
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intPort, err := strconv.Atoi(port)
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if err != nil {
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logger.Log(1, "error converting port to int: "+err.Error())
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}
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pinger.SetTarget(&ping.Target{
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Protocol: ping.TCP,
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Host: broker,
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Port: intPort,
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Counter: 3,
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Interval: 1 * time.Second,
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Timeout: 2 * time.Second,
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})
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pingerDone := pinger.Start()
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<-pingerDone
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if pinger.Result().SuccessCounter == 0 {
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return errors.New("unable to connect to broker port ... check netmaker server and firewalls")
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}
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return nil
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}
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