package home import ( "bufio" "context" "crypto/tls" "fmt" "io" "io/ioutil" "net" "net/http" "os" "os/exec" "os/signal" "path/filepath" "runtime" "strconv" "strings" "sync" "syscall" "time" "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" "github.com/NYTimes/gziphandler" "github.com/gobuffalo/packr" ) const ( // Used in config to indicate that syslog or eventlog (win) should be used for logger output configSyslog = "syslog" ) // Update-related variables var ( versionString string updateChannel string versionCheckURL string ARMVersion string ) const versionCheckPeriod = time.Hour * 8 // 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 httpServer *http.Server // HTTP module httpsServer HTTPSServer // HTTPS module // 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 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() if args.serviceControlAction != "" { handleServiceControlAction(args.serviceControlAction) return } Context.appSignalChannel = make(chan os.Signal) signal.Notify(Context.appSignalChannel, syscall.SIGINT, syscall.SIGTERM, syscall.SIGHUP, syscall.SIGQUIT) go func() { <-Context.appSignalChannel cleanup() cleanupAlways() os.Exit(0) }() // run the protection run(args) } // 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" } // Init some of the Context fields right away Context.transport = &http.Transport{ DialContext: customDialContext, } Context.client = &http.Client{ Timeout: time.Minute * 5, Transport: Context.transport, } // configure working dir and config path initWorkingDir(args) // configure log level and output configureLogger(args) // print the first message after logger is configured msg := "AdGuard Home, version %s, channel %s\n, arch %s %s" if ARMVersion != "" { msg = msg + " v" + ARMVersion } log.Printf(msg, versionString, updateChannel, runtime.GOOS, runtime.GOARCH, ARMVersion) 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 { requireAdminRights() } initConfig() initServices() if !Context.firstRun { // Do the upgrade if necessary err := upgradeConfig() if err != nil { log.Fatal(err) } err = parseConfig() if err != nil { os.Exit(1) } if args.checkConfig { log.Info("Configuration file is OK") os.Exit(0) } } config.DHCP.WorkDir = Context.workDir config.DHCP.HTTPRegister = httpRegister config.DHCP.ConfigModified = onConfigModified Context.dhcpServer = dhcpd.Create(config.DHCP) Context.clients.Init(config.Clients, Context.dhcpServer) 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 !Context.firstRun { // Save the updated config err := config.write() if err != nil { log.Fatal(err) } err = initDNSServer() if err != nil { log.Fatalf("%s", err) } go func() { err := startDNSServer() if err != nil { log.Fatal(err) } }() err = startDHCPServer() if err != nil { log.Fatal(err) } } if len(args.pidFile) != 0 && writePIDFile(args.pidFile) { Context.pidFileName = args.pidFile } // Initialize and run the admin Web interface box := packr.NewBox("../build/static") // if not configured, redirect / to /install.html, otherwise redirect /install.html to / http.Handle("/", postInstallHandler(optionalAuthHandler(gziphandler.GzipHandler(http.FileServer(box))))) registerControlHandlers() // add handlers for /install paths, we only need them when we're not configured yet if Context.firstRun { log.Info("This is the first launch of AdGuard Home, redirecting everything to /install.html ") http.Handle("/install.html", preInstallHandler(http.FileServer(box))) registerInstallHandlers() } Context.httpsServer.cond = sync.NewCond(&Context.httpsServer.Mutex) // for https, we have a separate goroutine loop go httpServerLoop() // this loop is used as an ability to change listening host and/or port for !Context.httpsServer.shutdown { printHTTPAddresses("http") // we need to have new instance, because after Shutdown() the Server is not usable address := net.JoinHostPort(config.BindHost, strconv.Itoa(config.BindPort)) Context.httpServer = &http.Server{ Addr: address, } err := Context.httpServer.ListenAndServe() if err != http.ErrServerClosed { cleanupAlways() log.Fatal(err) } // We use ErrServerClosed as a sign that we need to rebind on new address, so go back to the start of the loop } // wait indefinitely for other go-routines to complete their job select {} } func httpServerLoop() { for !Context.httpsServer.shutdown { Context.httpsServer.cond.L.Lock() // this mechanism doesn't let us through until all conditions are met for config.TLS.Enabled == false || config.TLS.PortHTTPS == 0 || len(config.TLS.PrivateKeyData) == 0 || len(config.TLS.CertificateChainData) == 0 { // sleep until necessary data is supplied Context.httpsServer.cond.Wait() } address := net.JoinHostPort(config.BindHost, strconv.Itoa(config.TLS.PortHTTPS)) // validate current TLS config and update warnings (it could have been loaded from file) data := validateCertificates(string(config.TLS.CertificateChainData), string(config.TLS.PrivateKeyData), config.TLS.ServerName) if !data.ValidPair { cleanupAlways() log.Fatal(data.WarningValidation) } config.Lock() config.TLS.tlsConfigStatus = data // update warnings config.Unlock() // prepare certs for HTTPS server // important -- they have to be copies, otherwise changing the contents in config.TLS will break encryption for in-flight requests certchain := make([]byte, len(config.TLS.CertificateChainData)) copy(certchain, config.TLS.CertificateChainData) privatekey := make([]byte, len(config.TLS.PrivateKeyData)) copy(privatekey, config.TLS.PrivateKeyData) cert, err := tls.X509KeyPair(certchain, privatekey) if err != nil { cleanupAlways() log.Fatal(err) } Context.httpsServer.cond.L.Unlock() // prepare HTTPS server Context.httpsServer.server = &http.Server{ Addr: address, TLSConfig: &tls.Config{ Certificates: []tls.Certificate{cert}, MinVersion: tls.VersionTLS12, }, } printHTTPAddresses("https") err = Context.httpsServer.server.ListenAndServeTLS("", "") if err != http.ErrServerClosed { cleanupAlways() log.Fatal(err) } } } // Check if the current user has root (administrator) rights // and if not, ask and try to run as root func requireAdminRights() { admin, _ := util.HaveAdminRights() if //noinspection ALL admin || isdelve.Enabled { return } if runtime.GOOS == "windows" { log.Fatal("This is the first launch of AdGuard Home. You must run it as Administrator.") } else { log.Error("This is the first launch of AdGuard Home. You must run it as root.") _, _ = io.WriteString(os.Stdout, "Do you want to start AdGuard Home as root user? [y/n] ") stdin := bufio.NewReader(os.Stdin) buf, _ := stdin.ReadString('\n') buf = strings.TrimSpace(buf) if buf != "y" { os.Exit(1) } cmd := exec.Command("sudo", os.Args...) cmd.Stdin = os.Stdin cmd.Stdout = os.Stdout cmd.Stderr = os.Stderr _ = cmd.Run() os.Exit(1) } } // 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 { ls.Verbose = true } if args.logFile != "" { ls.LogFile = args.logFile } // 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 } 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 } file, 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(file) } } func cleanup() { log.Info("Stopping AdGuard Home") err := stopDNSServer() if err != nil { log.Error("Couldn't stop DNS server: %s", err) } err = stopDHCPServer() if err != nil { log.Error("Couldn't stop DHCP server: %s", err) } } // Stop HTTP server, possibly waiting for all active connections to be closed func stopHTTPServer() { log.Info("Stopping HTTP server...") Context.httpsServer.shutdown = true if Context.httpsServer.server != nil { _ = Context.httpsServer.server.Shutdown(context.TODO()) } _ = Context.httpServer.Shutdown(context.TODO()) log.Info("Stopped HTTP server") } // This function is called before application exits func cleanupAlways() { if len(Context.pidFileName) != 0 { _ = os.Remove(Context.pidFileName) } log.Info("Stopped") } // command-line arguments type options struct { verbose bool // is verbose logging enabled configFilename string // path to the config file workDir string // path to the working directory where we will store the filters data and the querylog bindHost string // host address to bind HTTP server on bindPort int // port to serve HTTP pages on logFile string // Path to the log file. If empty, write to stdout. If "syslog", writes to syslog pidFile string // File name to save PID to checkConfig bool // Check configuration and exit disableUpdate bool // If set, don't check for updates // service control action (see service.ControlAction array + "status" command) serviceControlAction string // runningAsService flag is set to true when options are passed from the service runner runningAsService bool } // loadOptions reads command line arguments and initializes configuration func loadOptions() options { o := options{} var printHelp func() var opts = []struct { longName string shortName string description string callbackWithValue func(value string) callbackNoValue func() }{ {"config", "c", "Path to the config file", func(value string) { o.configFilename = value }, nil}, {"work-dir", "w", "Path to the working directory", func(value string) { o.workDir = value }, nil}, {"host", "h", "Host address to bind HTTP server on", func(value string) { o.bindHost = value }, nil}, {"port", "p", "Port to serve HTTP pages on", func(value string) { v, err := strconv.Atoi(value) if err != nil { panic("Got port that is not a number") } o.bindPort = v }, nil}, {"service", "s", "Service control action: status, install, uninstall, start, stop, restart", func(value string) { o.serviceControlAction = value }, nil}, {"logfile", "l", "Path to log file. If empty: write to stdout; if 'syslog': write to system log", func(value string) { o.logFile = value }, nil}, {"pidfile", "", "Path to a file where PID is stored", func(value string) { o.pidFile = value }, nil}, {"check-config", "", "Check configuration and exit", nil, func() { o.checkConfig = true }}, {"no-check-update", "", "Don't check for updates", nil, func() { o.disableUpdate = true }}, {"verbose", "v", "Enable verbose output", nil, func() { o.verbose = true }}, {"version", "", "Show the version and exit", nil, func() { fmt.Printf("AdGuardHome %s\n", versionString) os.Exit(0) }}, {"help", "", "Print this help", nil, func() { printHelp() os.Exit(64) }}, } printHelp = func() { fmt.Printf("Usage:\n\n") fmt.Printf("%s [options]\n\n", os.Args[0]) fmt.Printf("Options:\n") for _, opt := range opts { val := "" if opt.callbackWithValue != nil { val = " VALUE" } if opt.shortName != "" { fmt.Printf(" -%s, %-30s %s\n", opt.shortName, "--"+opt.longName+val, opt.description) } else { fmt.Printf(" %-34s %s\n", "--"+opt.longName+val, opt.description) } } } for i := 1; i < len(os.Args); i++ { v := os.Args[i] knownParam := false for _, opt := range opts { if v == "--"+opt.longName || (opt.shortName != "" && v == "-"+opt.shortName) { if opt.callbackWithValue != nil { if i+1 >= len(os.Args) { log.Error("Got %s without argument\n", v) os.Exit(64) } i++ opt.callbackWithValue(os.Args[i]) } else if opt.callbackNoValue != nil { opt.callbackNoValue() } knownParam = true break } } if !knownParam { log.Error("unknown option %v\n", v) printHelp() os.Exit(64) } } 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 if proto == "https" && config.TLS.ServerName != "" { if config.TLS.PortHTTPS == 443 { log.Printf("Go to https://%s", config.TLS.ServerName) } else { log.Printf("Go to https://%s:%d", config.TLS.ServerName, config.TLS.PortHTTPS) } } 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, strconv.Itoa(config.BindPort)) log.Printf("Go to %s://%s", proto, address) return } for _, iface := range ifaces { address = net.JoinHostPort(iface.Addresses[0], strconv.Itoa(config.BindPort)) log.Printf("Go to %s://%s", proto, address) } } else { address = net.JoinHostPort(config.BindHost, strconv.Itoa(config.BindPort)) 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...) }