private static void PostProcedures()
{
Logger.Info("[config] post procedures");
#region [ Apply Setup Configuration ]
SetupConfiguration.Set();
Logger.Info("machine configured (apply setup.conf)");
#endregion
#region [ Services ]
HostConfiguration.ApplyHostServices();
Logger.Info("services ready");
#endregion
#region [ Ssh ]
if (SshdConfiguration.IsActive())
{
SshdConfiguration.Set();
}
if (!Directory.Exists(Parameter.RootSsh))
{
Directory.CreateDirectory(Parameter.RootSsh);
}
if (!Directory.Exists(Parameter.RootSshMntCdrom))
{
Directory.CreateDirectory(Parameter.RootSshMntCdrom);
}
if (!MountHelper.IsAlreadyMounted(Parameter.RootSsh))
{
var mnt = new MountManagement();
mnt.Dir(Parameter.RootSsh);
}
var rk = new RootKeys();
if (rk.Exists == false)
{
rk.Create();
}
var authorizedKeysConfiguration = new AuthorizedKeysConfiguration();
var storedKeys = authorizedKeysConfiguration.Get().Keys;
foreach (var storedKey in storedKeys)
{
var home = storedKey.User == "root" ? "/root/.ssh" : $"/home/{storedKey.User}/.ssh";
var authorizedKeysPath = $"{home}/authorized_keys";
if (!File.Exists(authorizedKeysPath))
{
File.Create(authorizedKeysPath);
}
File.AppendAllLines(authorizedKeysPath, new List <string> {
$"{storedKey.KeyValue} {storedKey.RemoteUser}"
});
Bash.Execute($"chmod 600 {authorizedKeysPath}");
Bash.Execute($"chown {storedKey.User}:{storedKey.User} {authorizedKeysPath}");
}
Logger.Info("ssh ready");
#endregion
#region [ Avahi ]
const string avahiServicePath = "/etc/avahi/services/antd.service";
if (File.Exists(avahiServicePath))
{
File.Delete(avahiServicePath);
}
var appConfiguration = new AppConfiguration().Get();
File.WriteAllLines(avahiServicePath, AvahiCustomXml.Generate(appConfiguration.AntdUiPort.ToString()));
Bash.Execute("chmod 755 /etc/avahi/services", false);
Bash.Execute($"chmod 644 {avahiServicePath}", false);
Systemctl.Restart("avahi-daemon.service");
Systemctl.Restart("avahi-daemon.socket");
Logger.Info("avahi ready");
#endregion
#region [ AntdUI ]
UiService.Setup();
Logger.Info("antduisetup");
#endregion
}
private static void Main()
{
ConsoleLogger.Log("[boot step] starting antd");
var startTime = DateTime.Now;
ConsoleLogger.Log("[boot step] core procedures");
#region [ os Rw ]
Bash.Execute("mount -o remount,rw /", false);
Bash.Execute("mount -o remount,rw /mnt/cdrom", false);
#endregion
#region [ Remove Limits ]
const string limitsFile = "/etc/security/limits.conf";
if (File.Exists(limitsFile))
{
if (!File.ReadAllText(limitsFile).Contains("root - nofile 1024000"))
{
FileWithAcl.AppendAllLines(limitsFile, new[] { "root - nofile 1024000" }, "644", "root", "wheel");
}
}
Bash.Execute("ulimit -n 1024000", false);
#endregion
#region [ Overlay Watcher ]
if (Directory.Exists(Parameter.Overlay))
{
new OverlayWatcher().StartWatching();
ConsoleLogger.Log("overlay watcher ready");
}
#endregion
#region [ Working Directories ]
Directory.CreateDirectory(Parameter.AntdCfg);
Directory.CreateDirectory(Parameter.AntdCfgServices);
Directory.CreateDirectory(Parameter.AntdCfgNetwork);
Network2Configuration.CreateWorkingDirectories();
Directory.CreateDirectory(Parameter.AntdCfgParameters);
Directory.CreateDirectory(Parameter.AntdCfgCluster);
Directory.CreateDirectory($"{Parameter.AntdCfgServices}/acls");
Directory.CreateDirectory($"{Parameter.AntdCfgServices}/acls/template");
Directory.CreateDirectory(Parameter.RepoConfig);
Directory.CreateDirectory(Parameter.RepoDirs);
Directory.CreateDirectory(Parameter.AnthillaUnits);
Directory.CreateDirectory(Parameter.TimerUnits);
Directory.CreateDirectory(Parameter.AntdCfgVfs);
Directory.CreateDirectory(Parameter.AntdCfgRssdp);
ConsoleLogger.Log("working directories created");
MountManagement.WorkingDirectories();
ConsoleLogger.Log("working directories mounted");
#endregion
#region [ Mounts ]
if (MountHelper.IsAlreadyMounted("/mnt/cdrom/Kernel/active-firmware", "/lib64/firmware") == false)
{
Bash.Execute("mount /mnt/cdrom/Kernel/active-firmware /lib64/firmware", false);
}
var kernelRelease = Bash.Execute("uname -r").Trim();
var linkedRelease = Bash.Execute("file /mnt/cdrom/Kernel/active-modules").Trim();
if (MountHelper.IsAlreadyMounted("/mnt/cdrom/Kernel/active-modules") == false &&
linkedRelease.Contains(kernelRelease))
{
var moduleDir = $"/lib64/modules/{kernelRelease}/";
DirectoryWithAcl.CreateDirectory(moduleDir);
Bash.Execute($"mount /mnt/cdrom/Kernel/active-modules {moduleDir}", false);
}
Bash.Execute("systemctl restart systemd-modules-load.service", false);
MountManagement.AllDirectories();
ConsoleLogger.Log("mounts ready");
#endregion
#region [ Check Units Location ]
var anthillaUnits = Directory.EnumerateFiles(Parameter.AnthillaUnits, "*.*", SearchOption.TopDirectoryOnly);
if (!anthillaUnits.Any())
{
var antdUnits = Directory.EnumerateFiles(Parameter.AntdUnits, "*.*", SearchOption.TopDirectoryOnly);
foreach (var unit in antdUnits)
{
var trueUnit = unit.Replace(Parameter.AntdUnits, Parameter.AnthillaUnits);
if (!File.Exists(trueUnit))
{
File.Copy(unit, trueUnit);
}
File.Delete(unit);
Bash.Execute($"ln -s {trueUnit} {unit}");
}
var appsUnits = Directory.EnumerateFiles(Parameter.AppsUnits, "*.*", SearchOption.TopDirectoryOnly);
foreach (var unit in appsUnits)
{
var trueUnit = unit.Replace(Parameter.AntdUnits, Parameter.AnthillaUnits);
if (!File.Exists(trueUnit))
{
File.Copy(unit, trueUnit);
}
File.Delete(unit);
Bash.Execute($"ln -s {trueUnit} {unit}");
}
var applicativeUnits = Directory.EnumerateFiles(Parameter.ApplicativeUnits, "*.*", SearchOption.TopDirectoryOnly);
foreach (var unit in applicativeUnits)
{
var trueUnit = unit.Replace(Parameter.AntdUnits, Parameter.AnthillaUnits);
if (!File.Exists(trueUnit))
{
File.Copy(unit, trueUnit);
}
File.Delete(unit);
Bash.Execute($"ln -s {trueUnit} {unit}");
}
}
anthillaUnits = Directory.EnumerateFiles(Parameter.AnthillaUnits, "*.*", SearchOption.TopDirectoryOnly).ToList();
if (!anthillaUnits.Any())
{
foreach (var unit in anthillaUnits)
{
Bash.Execute($"chown root:wheel {unit}");
Bash.Execute($"chmod 644 {unit}");
}
}
ConsoleLogger.Log("[check] units integrity");
#endregion
#region [ Application Keys ]
var ak = new AsymmetricKeys(Parameter.AntdCfgKeys, KeyName);
var pub = ak.PublicKey;
#endregion
#region [ Secret ]
if (!File.Exists(Parameter.AntdCfgSecret))
{
FileWithAcl.WriteAllText(Parameter.AntdCfgSecret, Secret.Gen(), "644", "root", "wheel");
}
if (string.IsNullOrEmpty(File.ReadAllText(Parameter.AntdCfgSecret)))
{
FileWithAcl.WriteAllText(Parameter.AntdCfgSecret, Secret.Gen(), "644", "root", "wheel");
}
#endregion
#region [ License Management ]
var appconfig = new AppConfiguration().Get();
ConsoleLogger.Log($"[cloud] {appconfig.CloudAddress}");
try {
var machineIds = Machine.MachineIds.Get;
ConsoleLogger.Log($"[machineid] {machineIds.PartNumber}");
ConsoleLogger.Log($"[machineid] {machineIds.SerialNumber}");
ConsoleLogger.Log($"[machineid] {machineIds.MachineUid}");
var licenseManagement = new LicenseManagement();
licenseManagement.Download("Antd", machineIds, pub);
var licenseStatus = licenseManagement.Check("Antd", machineIds, pub);
ConsoleLogger.Log(licenseStatus == null
? "[license] license results null"
: $"[license] {licenseStatus.Status} - {licenseStatus.Message}");
}
catch (Exception ex) {
ConsoleLogger.Warn(ex.Message);
}
#endregion
#region [ JournalD ]
if (JournaldConfiguration.IsActive())
{
JournaldConfiguration.Set();
}
#endregion
#region [ Import Existing Configuration ]
Network2Configuration.SetWorkingDirectories();
#region import host2model
var tmpHost = HostConfiguration.Host;
var varsFile = Host2Configuration.FilePath;
var vars = new Host2Model {
HostName = tmpHost.HostName.StoredValues.FirstOrDefault().Value,
HostChassis = tmpHost.HostChassis.StoredValues.FirstOrDefault().Value,
HostDeployment = tmpHost.HostDeployment.StoredValues.FirstOrDefault().Value,
HostLocation = tmpHost.HostLocation.StoredValues.FirstOrDefault().Value,
InternalDomainPrimary = tmpHost.InternalDomain,
ExternalDomainPrimary = tmpHost.ExternalDomain,
InternalHostIpPrimary = "",
ExternalHostIpPrimary = "",
Timezone = tmpHost.Timezone.StoredValues.FirstOrDefault().Value,
NtpdateServer = tmpHost.NtpdateServer.StoredValues.FirstOrDefault().Value,
MachineUid = Machine.MachineIds.Get.MachineUid,
Cloud = Parameter.Cloud
};
if (File.Exists(HostConfiguration.FilePath))
{
if (!File.Exists(varsFile))
{
ConsoleLogger.Log("[data import] host configuration");
Host2Configuration.Export(vars);
}
else
{
if (string.IsNullOrEmpty(File.ReadAllText(varsFile)))
{
ConsoleLogger.Log("[data import] host configuration");
Host2Configuration.Export(vars);
}
}
}
#endregion
#region import network2model
var tmpNet = NetworkConfiguration.Get();
var tmpHost2 = Host2Configuration.Host;
var niflist = new List <NetworkInterface>();
foreach (var cif in tmpNet.Interfaces)
{
ConsoleLogger.Log($"[data import] network configuration for '{cif.Interface}'");
var broadcast = "";
try {
broadcast = Cidr.CalcNetwork(cif.StaticAddress, cif.StaticRange).Broadcast.ToString();
}
catch (Exception ex) {
ConsoleLogger.Error($"[data import] {ex.Message}");
}
var hostname = $"{vars.HostName}{NetworkInterfaceType.Internal}.{vars.InternalDomainPrimary}";
var subnet = tmpHost2.InternalNetPrimaryBits;
var index = Network2Configuration.InterfaceConfigurationList.Count(_ => _.Type == NetworkInterfaceType.Internal);
var networkConfiguration = new NetworkInterfaceConfiguration {
Id = cif.Interface + cif.Guid.Substring(0, 8),
Adapter = cif.Type,
Alias = "import " + cif.Interface,
Ip = cif.StaticAddress,
Subnet = subnet,
Mode = cif.Mode,
ChildrenIf = cif.InterfaceList,
Broadcast = broadcast,
Type = NetworkInterfaceType.Internal,
Hostname = hostname,
Index = index,
Description = "import " + cif.Interface,
RoleVerb = NetworkRoleVerb.iif
};
var tryget = Network2Configuration.InterfaceConfigurationList.FirstOrDefault(_ => _.Id == networkConfiguration.Id);
if (tryget == null)
{
Network2Configuration.AddInterfaceConfiguration(networkConfiguration);
}
var ifConfig = new NetworkInterface {
Device = cif.Interface,
Configuration = networkConfiguration.Id,
AdditionalConfigurations = new List <string>(),
GatewayConfiguration = ""
};
var tryget2 = Network2Configuration.Conf.Interfaces.FirstOrDefault(_ => _.Device == cif.Interface);
if (tryget2 == null)
{
niflist.Add(ifConfig);
}
}
if (niflist.Any())
{
Network2Configuration.SaveInterfaceSetting(niflist);
}
if (!Network2Configuration.GatewayConfigurationList.Any())
{
var defaultGatewayConfiguration = new NetworkGatewayConfiguration {
Id = Random.ShortGuid(),
IsDefault = true,
GatewayAddress = vars.InternalHostIpPrimary,
Description = "DFGW"
};
Network2Configuration.AddGatewayConfiguration(defaultGatewayConfiguration);
}
#endregion
#region import parameters
if (!File.Exists($"{Parameter.AntdCfgParameters}/endcommands.conf"))
{
var tmpsetup = SetupConfiguration.Get();
HostParametersConfiguration.SetEndCommandsList(tmpsetup);
}
if (!File.Exists($"{Parameter.AntdCfgParameters}/modprobes.conf"))
{
var ddd = EnumerableExtensions.Merge(tmpHost.Modprobes.Select(_ => _.StoredValues.Select(___ => ___.Value)));
HostParametersConfiguration.SetModprobesList(ddd.ToList());
}
if (!File.Exists($"{Parameter.AntdCfgParameters}/rmmod.conf"))
{
var ddd = tmpHost.RemoveModules.StoredValues.FirstOrDefault().Value.Split(new[] { " " }, StringSplitOptions.RemoveEmptyEntries);
HostParametersConfiguration.SetRmmodList(ddd.ToList());
}
if (!File.Exists($"{Parameter.AntdCfgParameters}/modulesblacklist.conf"))
{
var ddd = tmpHost.ModulesBlacklist;
HostParametersConfiguration.SetModulesBlacklistList(ddd.ToList());
}
if (!File.Exists($"{Parameter.AntdCfgParameters}/osparameters.conf"))
{
var list = new List <string> {
"/proc/sys/fs/file-max 1024000",
"/proc/sys/net/bridge/bridge-nf-call-arptables 0",
"/proc/sys/net/bridge/bridge-nf-call-ip6tables 0",
"/proc/sys/net/bridge/bridge-nf-call-iptables 0",
"/proc/sys/net/bridge/bridge-nf-filter-pppoe-tagged 0",
"/proc/sys/net/bridge/bridge-nf-filter-vlan-tagged 0",
"/proc/sys/net/core/netdev_max_backlog 300000",
"/proc/sys/net/core/optmem_max 40960",
"/proc/sys/net/core/rmem_max 268435456",
"/proc/sys/net/core/somaxconn 65536",
"/proc/sys/net/core/wmem_max 268435456",
"/proc/sys/net/ipv4/conf/all/accept_local 1",
"/proc/sys/net/ipv4/conf/all/accept_redirects 1",
"/proc/sys/net/ipv4/conf/all/accept_source_route 1",
"/proc/sys/net/ipv4/conf/all/rp_filter 0",
"/proc/sys/net/ipv4/conf/all/forwarding 1",
"/proc/sys/net/ipv4/conf/default/rp_filter 0",
"/proc/sys/net/ipv4/ip_forward 1",
"/proc/sys/net/ipv4/ip_local_port_range 1024 65000",
"/proc/sys/net/ipv4/ip_no_pmtu_disc 1",
"/proc/sys/net/ipv4/tcp_congestion_control htcp",
"/proc/sys/net/ipv4/tcp_fin_timeout 40",
"/proc/sys/net/ipv4/tcp_max_syn_backlog 3240000",
"/proc/sys/net/ipv4/tcp_max_tw_buckets 1440000",
"/proc/sys/net/ipv4/tcp_moderate_rcvbuf 1",
"/proc/sys/net/ipv4/tcp_mtu_probing 1",
"/proc/sys/net/ipv4/tcp_rmem 4096 87380 134217728",
"/proc/sys/net/ipv4/tcp_slow_start_after_idle 1",
"/proc/sys/net/ipv4/tcp_tw_recycle 0",
"/proc/sys/net/ipv4/tcp_tw_reuse 1",
"/proc/sys/net/ipv4/tcp_window_scaling 1",
"/proc/sys/net/ipv4/tcp_wmem 4096 65536 134217728",
"/proc/sys/net/ipv6/conf/br0/disable_ipv6 1",
"/proc/sys/net/ipv6/conf/eth0/disable_ipv6 1",
"/proc/sys/net/ipv6/conf/wlan0/disable_ipv6 1",
"/proc/sys/vm/swappiness 0"
};
HostParametersConfiguration.SetOsParametersList(list);
ConsoleLogger.Log("[data import] parameters");
}
#endregion
#endregion
#region [ Adjustments ]
new Do().ParametersChangesPre();
ConsoleLogger.Log("modules, services and os parameters ready");
#endregion
ConsoleLogger.Log("[boot step] procedures");
#region [ Users ]
var manageMaster = new ManageMaster();
manageMaster.Setup();
UserConfiguration.Import();
UserConfiguration.Set();
ConsoleLogger.Log("users config ready");
#endregion
#region [ Host Configuration & Name Service ]
new Do().HostChanges();
ConsoleLogger.Log("host configured");
ConsoleLogger.Log("name service ready");
#endregion
#region [ Network ]
new Do().NetworkChanges();
if (File.Exists("/cfg/antd/services/network.conf"))
{
File.Delete("/cfg/antd/services/network.conf");
}
if (File.Exists("/cfg/antd/services/network.conf.bck"))
{
File.Delete("/cfg/antd/services/network.conf.bck");
}
ConsoleLogger.Log("network ready");
#endregion
#region [ Firewall ]
if (FirewallConfiguration.IsActive())
{
FirewallConfiguration.Set();
}
#endregion
#region [ Dhcpd ]
DhcpdConfiguration.TryImport();
if (DhcpdConfiguration.IsActive())
{
DhcpdConfiguration.Set();
}
#endregion
#region [ Bind ]
BindConfiguration.TryImport();
BindConfiguration.DownloadRootServerHits();
if (BindConfiguration.IsActive())
{
BindConfiguration.Set();
}
#endregion
ConsoleLogger.Log("[boot step] post procedures");
#region [ Apply Setup Configuration ]
new Do().ParametersChangesPost();
ConsoleLogger.Log("machine configured (apply setup.conf)");
#endregion
#region [ Nginx ]
NginxConfiguration.TryImport();
if (NginxConfiguration.IsActive())
{
NginxConfiguration.Set();
}
#endregion
#region [ Ssh ]
if (SshdConfiguration.IsActive())
{
SshdConfiguration.Set();
}
DirectoryWithAcl.CreateDirectory(Parameter.RootSsh, "755", "root", "wheel");
DirectoryWithAcl.CreateDirectory(Parameter.RootSshMntCdrom, "755", "root", "wheel");
if (!MountHelper.IsAlreadyMounted(Parameter.RootSsh))
{
MountManagement.Dir(Parameter.RootSsh);
}
var rk = new RootKeys();
if (rk.Exists == false)
{
rk.Create();
}
var authorizedKeysConfiguration = new AuthorizedKeysConfiguration();
var storedKeys = authorizedKeysConfiguration.Get().Keys;
foreach (var storedKey in storedKeys)
{
var home = storedKey.User == "root" ? "/root/.ssh" : $"/home/{storedKey.User}/.ssh";
var authorizedKeysPath = $"{home}/authorized_keys";
if (!File.Exists(authorizedKeysPath))
{
File.Create(authorizedKeysPath);
}
FileWithAcl.AppendAllLines(authorizedKeysPath, new List <string> {
$"{storedKey.KeyValue} {storedKey.RemoteUser}"
}, "644", "root", "wheel");
Bash.Execute($"chmod 600 {authorizedKeysPath}");
Bash.Execute($"chown {storedKey.User}:{storedKey.User} {authorizedKeysPath}");
}
ConsoleLogger.Log("ssh ready");
#endregion
#region [ Service Discovery ]
try {
ServiceDiscovery.Rssdp.PublishThisDevice();
ConsoleLogger.Log("[rssdp] published device");
}
catch (Exception ex) {
ConsoleLogger.Log($"[rssdp] {ex.Message}");
}
#endregion
#region [ AntdUI ]
UiService.Setup();
ConsoleLogger.Log("antduisetup");
#endregion
ConsoleLogger.Log("[boot step] managed procedures");
#region [ Samba ]
if (SambaConfiguration.IsActive())
{
SambaConfiguration.Set();
}
#endregion
#region [ Syslog ]
if (SyslogNgConfiguration.IsActive())
{
SyslogNgConfiguration.Set();
}
#endregion
#region [ Storage - Zfs ]
foreach (var pool in Zpool.ImportList().ToList())
{
if (string.IsNullOrEmpty(pool))
{
continue;
}
ConsoleLogger.Log($"pool {pool} imported");
Zpool.Import(pool);
}
ConsoleLogger.Log("storage ready");
#endregion
#region [ Scheduler ]
Timers.MoveExistingTimers();
Timers.Setup();
Timers.Import();
Timers.Export();
foreach (var zp in Zpool.List())
{
Timers.Create(zp.Name.ToLower() + "snap", "hourly", $"/sbin/zfs snap -r {zp.Name}@${{TTDATE}}");
}
Timers.StartAll();
new SnapshotCleanup().Start(new TimeSpan(2, 00, 00));
new SyncTime().Start(new TimeSpan(0, 42, 00));
new RemoveUnusedModules().Start(new TimeSpan(2, 15, 00));
JobManager jobManager = new JobManager();
jobManager.ExecuteAllJobs();
ConsoleLogger.Log("scheduled events ready");
#endregion
#region [ Acl ]
if (AclConfiguration.IsActive())
{
AclConfiguration.Set();
AclConfiguration.ScriptSetup();
}
#endregion
#region [ C A ]
if (CaConfiguration.IsActive())
{
CaConfiguration.Set();
}
#endregion
#region [ Host Init ]
var app = new AppConfiguration().Get();
var port = app.AntdPort;
var uri = $"http://localhost:{app.AntdPort}/";
var host = new NancyHost(new Uri(uri));
host.Start();
ConsoleLogger.Log("host ready");
StaticConfiguration.DisableErrorTraces = false;
ConsoleLogger.Log($"http port: {port}");
ConsoleLogger.Log("[boot step] antd is running");
#endregion
ConsoleLogger.Log("[boot step] working procedures");
#region [ Apps ]
AppTarget.Setup();
var apps = AppsConfiguration.Get().Apps;
foreach (var mapp in apps)
{
var units = mapp.UnitLauncher;
foreach (var unit in units)
{
if (Systemctl.IsActive(unit) == false)
{
Systemctl.Restart(unit);
}
}
}
//AppTarget.StartAll();
ConsoleLogger.Log("apps ready");
#endregion
#region [ Sync / Gluster ]
if (GlusterConfiguration.IsActive())
{
GlusterConfiguration.Launch();
}
if (RsyncConfiguration.IsActive())
{
RsyncConfiguration.Set();
}
#endregion
#region [ Storage Server ]
VfsConfiguration.SetDefaults();
new Thread(() => {
try {
var srv = new StorageServer(VfsConfiguration.GetSystemConfiguration());
srv.Start();
}
catch (Exception ex) {
ConsoleLogger.Error(ex.Message);
}
}).Start();
#endregion
#region [ Tor ]
if (TorConfiguration.IsActive())
{
TorConfiguration.Start();
}
#endregion
#region [ Cluster ]
VfsWatcher = new VfsWatcher();
ClusterConfiguration.Prepare();
new Do().ClusterChanges();
ConsoleLogger.Log("[cluster] active");
#endregion
#region [ Directory Watchers ]
DirectoryWatcherCluster.Start();
DirectoryWatcherRsync.Start();
#endregion
#region [ Check Application File Acls ]
var files = Directory.EnumerateFiles(Parameter.RepoApps, "*.squashfs.xz", SearchOption.AllDirectories);
foreach (var file in files)
{
Bash.Execute($"chmod 644 {file}");
Bash.Execute($"chown root:wheel {file}");
}
ConsoleLogger.Log("[check] app-file acl");
#endregion
#region [ Check System Components ]
MachineInfo.CheckSystemComponents();
ConsoleLogger.Log("[check] system components health");
#endregion
#region [ Test ]
#if DEBUG
Test();
#endif
#endregion
ConsoleLogger.Log($"loaded in: {DateTime.Now - startTime}");
KeepAlive();
ConsoleLogger.Log("antd is closing");
host.Stop();
Console.WriteLine("host shutdown");
}