package home import ( "context" "crypto/tls" "crypto/x509" "fmt" "io/ioutil" "net" "net/http" "net/url" "os" "os/signal" "path/filepath" "runtime" "strconv" "sync" "syscall" "time" "gopkg.in/natefinch/lumberjack.v2" "github.com/AdguardTeam/AdGuardHome/update" "github.com/AdguardTeam/AdGuardHome/util" "github.com/joomcode/errorx" "github.com/AdguardTeam/AdGuardHome/isdelve" "github.com/AdguardTeam/AdGuardHome/dhcpd" "github.com/AdguardTeam/AdGuardHome/dnsfilter" "github.com/AdguardTeam/AdGuardHome/dnsforward" "github.com/AdguardTeam/AdGuardHome/querylog" "github.com/AdguardTeam/AdGuardHome/stats" "github.com/AdguardTeam/golibs/log" ) const ( // Used in config to indicate that syslog or eventlog (win) should be used for logger output configSyslog = "syslog" ) // Update-related variables var ( versionString = "dev" updateChannel = "none" versionCheckURL = "" ARMVersion = "" ) // Global context type homeContext struct { // Modules // -- clients clientsContainer // per-client-settings module stats stats.Stats // statistics module queryLog querylog.QueryLog // query log module dnsServer *dnsforward.Server // DNS module rdns *RDNS // rDNS module whois *Whois // WHOIS module dnsFilter *dnsfilter.Dnsfilter // DNS filtering module dhcpServer *dhcpd.Server // DHCP module auth *Auth // HTTP authentication module filters Filtering // DNS filtering module web *Web // Web (HTTP, HTTPS) module tls *TLSMod // TLS module autoHosts util.AutoHosts // IP-hostname pairs taken from system configuration (e.g. /etc/hosts) files updater *update.Updater // Runtime properties // -- configFilename string // Config filename (can be overridden via the command line arguments) workDir string // Location of our directory, used to protect against CWD being somewhere else firstRun bool // if set to true, don't run any services except HTTP web inteface, and serve only first-run html pidFileName string // PID file name. Empty if no PID file was created. disableUpdate bool // If set, don't check for updates controlLock sync.Mutex tlsRoots *x509.CertPool // list of root CAs for TLSv1.2 tlsCiphers []uint16 // list of TLS ciphers to use transport *http.Transport client *http.Client appSignalChannel chan os.Signal // Channel for receiving OS signals by the console app // runningAsService flag is set to true when options are passed from the service runner runningAsService bool } // getDataDir returns path to the directory where we store databases and filters func (c *homeContext) getDataDir() string { return filepath.Join(c.workDir, dataDir) } // Context - a global context object var Context homeContext // Main is the entry point func Main(version string, channel string, armVer string) { // Init update-related global variables versionString = version updateChannel = channel ARMVersion = armVer versionCheckURL = "https://static.adguard.com/adguardhome/" + updateChannel + "/version.json" // config can be specified, which reads options from there, but other command line flags have to override config values // therefore, we must do it manually instead of using a lib args := loadOptions() Context.appSignalChannel = make(chan os.Signal) signal.Notify(Context.appSignalChannel, syscall.SIGINT, syscall.SIGTERM, syscall.SIGHUP, syscall.SIGQUIT) go func() { for { sig := <-Context.appSignalChannel log.Info("Received signal '%s'", sig) switch sig { case syscall.SIGHUP: Context.clients.Reload() Context.tls.Reload() default: cleanup() cleanupAlways() os.Exit(0) } } }() if args.serviceControlAction != "" { handleServiceControlAction(args) return } // run the protection run(args) } // version - returns the current version string func version() string { msg := "AdGuard Home, version %s, channel %s, arch %s %s" if ARMVersion != "" { msg = msg + " v" + ARMVersion } return fmt.Sprintf(msg, versionString, updateChannel, runtime.GOOS, runtime.GOARCH) } // run initializes configuration and runs the AdGuard Home // run is a blocking method! // nolint func run(args options) { // config file path can be overridden by command-line arguments: if args.configFilename != "" { Context.configFilename = args.configFilename } else { // Default config file name Context.configFilename = "AdGuardHome.yaml" } // configure working dir and config path initWorkingDir(args) // configure log level and output configureLogger(args) // Go memory hacks memoryUsage(args) // print the first message after logger is configured log.Println(version()) log.Debug("Current working directory is %s", Context.workDir) if args.runningAsService { log.Info("AdGuard Home is running as a service") } Context.runningAsService = args.runningAsService Context.disableUpdate = args.disableUpdate Context.firstRun = detectFirstRun() if Context.firstRun { log.Info("This is the first time AdGuard Home is launched") checkPermissions() } initConfig() Context.tlsRoots = util.LoadSystemRootCAs() Context.tlsCiphers = util.InitTLSCiphers() Context.transport = &http.Transport{ DialContext: customDialContext, Proxy: getHTTPProxy, TLSClientConfig: &tls.Config{ RootCAs: Context.tlsRoots, }, } Context.client = &http.Client{ Timeout: time.Minute * 5, Transport: Context.transport, } if !Context.firstRun { // Do the upgrade if necessary err := upgradeConfig() if err != nil { log.Fatal(err) } err = parseConfig() if err != nil { log.Error("Failed to parse configuration, exiting") os.Exit(1) } if args.checkConfig { log.Info("Configuration file is OK") os.Exit(0) } } // 'clients' module uses 'dnsfilter' module's static data (dnsfilter.BlockedSvcKnown()), // so we have to initialize dnsfilter's static data first, // but also avoid relying on automatic Go init() function dnsfilter.InitModule() config.DHCP.WorkDir = Context.workDir config.DHCP.HTTPRegister = httpRegister config.DHCP.ConfigModified = onConfigModified if runtime.GOOS != "windows" { Context.dhcpServer = dhcpd.Create(config.DHCP) if Context.dhcpServer == nil { log.Fatalf("Can't initialize DHCP module") } } Context.autoHosts.Init("") Context.updater = update.NewUpdater(update.Config{ Client: Context.client, WorkDir: Context.workDir, VersionURL: versionCheckURL, VersionString: versionString, OS: runtime.GOOS, Arch: runtime.GOARCH, ARMVersion: ARMVersion, ConfigName: config.getConfigFilename(), }) Context.clients.Init(config.Clients, Context.dhcpServer, &Context.autoHosts) config.Clients = nil if (runtime.GOOS == "linux" || runtime.GOOS == "darwin") && config.RlimitNoFile != 0 { util.SetRlimit(config.RlimitNoFile) } // override bind host/port from the console if args.bindHost != "" { config.BindHost = args.bindHost } if args.bindPort != 0 { config.BindPort = args.bindPort } if len(args.pidFile) != 0 && writePIDFile(args.pidFile) { Context.pidFileName = args.pidFile } if !Context.firstRun { // Save the updated config err := config.write() if err != nil { log.Fatal(err) } if config.DebugPProf { mux := http.NewServeMux() util.PProfRegisterWebHandlers(mux) go func() { log.Info("pprof: listening on localhost:6060") err := http.ListenAndServe("localhost:6060", mux) log.Error("Error while running the pprof server: %s", err) }() } } err := os.MkdirAll(Context.getDataDir(), 0755) if err != nil { log.Fatalf("Cannot create DNS data dir at %s: %s", Context.getDataDir(), err) } sessFilename := filepath.Join(Context.getDataDir(), "sessions.db") GLMode = args.glinetMode Context.auth = InitAuth(sessFilename, config.Users, config.WebSessionTTLHours*60*60) if Context.auth == nil { log.Fatalf("Couldn't initialize Auth module") } config.Users = nil Context.tls = tlsCreate(config.TLS) if Context.tls == nil { log.Fatalf("Can't initialize TLS module") } webConf := WebConfig{ firstRun: Context.firstRun, BindHost: config.BindHost, BindPort: config.BindPort, } Context.web = CreateWeb(&webConf) if Context.web == nil { log.Fatalf("Can't initialize Web module") } if !Context.firstRun { err := initDNSServer() if err != nil { log.Fatalf("%s", err) } Context.tls.Start() Context.autoHosts.Start() go func() { err := startDNSServer() if err != nil { log.Fatal(err) } }() if Context.dhcpServer != nil { _ = Context.dhcpServer.Start() } } Context.web.Start() // wait indefinitely for other go-routines to complete their job select {} } // StartMods - initialize and start DNS after installation func StartMods() error { err := initDNSServer() if err != nil { return err } Context.tls.Start() err = startDNSServer() if err != nil { closeDNSServer() return err } return nil } // Check if the current user permissions are enough to run AdGuard Home func checkPermissions() { log.Info("Checking if AdGuard Home has necessary permissions") if runtime.GOOS == "windows" { // On Windows we need to have admin rights to run properly admin, _ := util.HaveAdminRights() if //noinspection ALL admin || isdelve.Enabled { // Don't forget that for this to work you need to add "delve" tag explicitly // https://stackoverflow.com/questions/47879070/how-can-i-see-if-the-goland-debugger-is-running-in-the-program return } log.Fatal("This is the first launch of AdGuard Home. You must run it as Administrator.") } // We should check if AdGuard Home is able to bind to port 53 ok, err := util.CanBindPort(53) if ok { log.Info("AdGuard Home can bind to port 53") return } if opErr, ok := err.(*net.OpError); ok { if sysErr, ok := opErr.Err.(*os.SyscallError); ok { if errno, ok := sysErr.Err.(syscall.Errno); ok && errno == syscall.EACCES { msg := `Permission check failed. AdGuard Home is not allowed to bind to privileged ports (for instance, port 53). Please note, that this is crucial for a server to be able to use privileged ports. You have two options: 1. Run AdGuard Home with root privileges 2. On Linux you can grant the CAP_NET_BIND_SERVICE capability: https://github.com/AdguardTeam/AdGuardHome/wiki/Getting-Started#running-without-superuser` log.Fatal(msg) } } } msg := fmt.Sprintf(`AdGuard failed to bind to port 53 due to %v Please note, that this is crucial for a DNS server to be able to use that port.`, err) log.Info(msg) } // Write PID to a file func writePIDFile(fn string) bool { data := fmt.Sprintf("%d", os.Getpid()) err := ioutil.WriteFile(fn, []byte(data), 0644) if err != nil { log.Error("Couldn't write PID to file %s: %v", fn, err) return false } return true } // initWorkingDir initializes the workDir // if no command-line arguments specified, we use the directory where our binary file is located func initWorkingDir(args options) { execPath, err := os.Executable() if err != nil { panic(err) } if args.workDir != "" { // If there is a custom config file, use it's directory as our working dir Context.workDir = args.workDir } else { Context.workDir = filepath.Dir(execPath) } } // configureLogger configures logger level and output func configureLogger(args options) { ls := getLogSettings() // command-line arguments can override config settings if args.verbose || config.Verbose { ls.Verbose = true } if args.logFile != "" { ls.LogFile = args.logFile } else if config.LogFile != "" { ls.LogFile = config.LogFile } // Handle default log settings overrides ls.LogCompress = config.LogCompress ls.LogLocalTime = config.LogLocalTime ls.LogMaxBackups = config.LogMaxBackups ls.LogMaxSize = config.LogMaxSize ls.LogMaxAge = config.LogMaxAge // log.SetLevel(log.INFO) - default if ls.Verbose { log.SetLevel(log.DEBUG) } if args.runningAsService && ls.LogFile == "" && runtime.GOOS == "windows" { // When running as a Windows service, use eventlog by default if nothing else is configured // Otherwise, we'll simply loose the log output ls.LogFile = configSyslog } // logs are written to stdout (default) if ls.LogFile == "" { return } if ls.LogFile == configSyslog { // Use syslog where it is possible and eventlog on Windows err := util.ConfigureSyslog(serviceName) if err != nil { log.Fatalf("cannot initialize syslog: %s", err) } } else { logFilePath := filepath.Join(Context.workDir, ls.LogFile) if filepath.IsAbs(ls.LogFile) { logFilePath = ls.LogFile } _, err := os.OpenFile(logFilePath, os.O_WRONLY|os.O_CREATE|os.O_APPEND, 0644) if err != nil { log.Fatalf("cannot create a log file: %s", err) } log.SetOutput(&lumberjack.Logger{ Filename: logFilePath, Compress: ls.LogCompress, // disabled by default LocalTime: ls.LogLocalTime, MaxBackups: ls.LogMaxBackups, MaxSize: ls.LogMaxSize, // megabytes MaxAge: ls.LogMaxAge, //days }) } } func cleanup() { log.Info("Stopping AdGuard Home") if Context.web != nil { Context.web.Close() Context.web = nil } if Context.auth != nil { Context.auth.Close() Context.auth = nil } err := stopDNSServer() if err != nil { log.Error("Couldn't stop DNS server: %s", err) } if Context.dhcpServer != nil { Context.dhcpServer.Stop() } Context.autoHosts.Close() if Context.tls != nil { Context.tls.Close() Context.tls = nil } } // This function is called before application exits func cleanupAlways() { if len(Context.pidFileName) != 0 { _ = os.Remove(Context.pidFileName) } log.Info("Stopped") } func exitWithError() { os.Exit(64) } // loadOptions reads command line arguments and initializes configuration func loadOptions() options { o, f, err := parse(os.Args[0], os.Args[1:]) if err != nil { log.Error(err.Error()) _ = printHelp(os.Args[0]) exitWithError() } else if f != nil { err = f() if err != nil { log.Error(err.Error()) exitWithError() } else { os.Exit(0) } } return o } // prints IP addresses which user can use to open the admin interface // proto is either "http" or "https" func printHTTPAddresses(proto string) { var address string tlsConf := tlsConfigSettings{} if Context.tls != nil { Context.tls.WriteDiskConfig(&tlsConf) } port := strconv.Itoa(config.BindPort) if proto == "https" { port = strconv.Itoa(tlsConf.PortHTTPS) } if proto == "https" && tlsConf.ServerName != "" { if tlsConf.PortHTTPS == 443 { log.Printf("Go to https://%s", tlsConf.ServerName) } else { log.Printf("Go to https://%s:%s", tlsConf.ServerName, port) } } else if config.BindHost == "0.0.0.0" { log.Println("AdGuard Home is available on the following addresses:") ifaces, err := util.GetValidNetInterfacesForWeb() if err != nil { // That's weird, but we'll ignore it address = net.JoinHostPort(config.BindHost, port) log.Printf("Go to %s://%s", proto, address) return } for _, iface := range ifaces { for _, addr := range iface.Addresses { address = net.JoinHostPort(addr, strconv.Itoa(config.BindPort)) log.Printf("Go to %s://%s", proto, address) } } } else { address = net.JoinHostPort(config.BindHost, port) log.Printf("Go to %s://%s", proto, address) } } // ------------------- // first run / install // ------------------- func detectFirstRun() bool { configfile := Context.configFilename if !filepath.IsAbs(configfile) { configfile = filepath.Join(Context.workDir, Context.configFilename) } _, err := os.Stat(configfile) if !os.IsNotExist(err) { // do nothing, file exists return false } return true } // Connect to a remote server resolving hostname using our own DNS server func customDialContext(ctx context.Context, network, addr string) (net.Conn, error) { log.Tracef("network:%v addr:%v", network, addr) host, port, err := net.SplitHostPort(addr) if err != nil { return nil, err } dialer := &net.Dialer{ Timeout: time.Minute * 5, } if net.ParseIP(host) != nil || config.DNS.Port == 0 { con, err := dialer.DialContext(ctx, network, addr) return con, err } addrs, e := Context.dnsServer.Resolve(host) log.Debug("dnsServer.Resolve: %s: %v", host, addrs) if e != nil { return nil, e } if len(addrs) == 0 { return nil, fmt.Errorf("couldn't lookup host: %s", host) } var dialErrs []error for _, a := range addrs { addr = net.JoinHostPort(a.String(), port) con, err := dialer.DialContext(ctx, network, addr) if err != nil { dialErrs = append(dialErrs, err) continue } return con, err } return nil, errorx.DecorateMany(fmt.Sprintf("couldn't dial to %s", addr), dialErrs...) } func getHTTPProxy(req *http.Request) (*url.URL, error) { if len(config.ProxyURL) == 0 { return nil, nil } return url.Parse(config.ProxyURL) }