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home.go
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home.go
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// Package home contains AdGuard Home's HTTP API methods.
package home
import (
"context"
"crypto/tls"
"crypto/x509"
"fmt"
"io/fs"
"net"
"net/http"
"net/http/pprof"
"net/url"
"os"
"os/signal"
"path/filepath"
"runtime"
"sync"
"syscall"
"time"
"github.com/AdguardTeam/AdGuardHome/internal/aghalg"
"github.com/AdguardTeam/AdGuardHome/internal/aghhttp"
"github.com/AdguardTeam/AdGuardHome/internal/aghnet"
"github.com/AdguardTeam/AdGuardHome/internal/aghos"
"github.com/AdguardTeam/AdGuardHome/internal/aghtls"
"github.com/AdguardTeam/AdGuardHome/internal/dhcpd"
"github.com/AdguardTeam/AdGuardHome/internal/dnsforward"
"github.com/AdguardTeam/AdGuardHome/internal/filtering"
"github.com/AdguardTeam/AdGuardHome/internal/querylog"
"github.com/AdguardTeam/AdGuardHome/internal/stats"
"github.com/AdguardTeam/AdGuardHome/internal/updater"
"github.com/AdguardTeam/AdGuardHome/internal/version"
"github.com/AdguardTeam/golibs/errors"
"github.com/AdguardTeam/golibs/log"
"github.com/AdguardTeam/golibs/netutil"
"golang.org/x/exp/slices"
"gopkg.in/natefinch/lumberjack.v2"
)
const (
// Used in config to indicate that syslog or eventlog (win) should be used for logger output
configSyslog = "syslog"
)
// Global context
type homeContext struct {
// Modules
// --
clients clientsContainer // per-client-settings module
stats stats.Interface // statistics module
queryLog querylog.QueryLog // query log module
dnsServer *dnsforward.Server // DNS module
rdns *RDNS // rDNS module
whois *WHOIS // WHOIS module
dhcpServer dhcpd.Interface // DHCP module
auth *Auth // HTTP authentication module
filters *filtering.DNSFilter // DNS filtering module
web *Web // Web (HTTP, HTTPS) module
tls *TLSMod // TLS module
// etcHosts is an IP-hostname pairs set taken from system configuration
// (e.g. /etc/hosts) files.
etcHosts *aghnet.HostsContainer
// hostsWatcher is the watcher to detect changes in the hosts files.
hostsWatcher aghos.FSWatcher
updater *updater.Updater
// mux is our custom http.ServeMux.
mux *http.ServeMux
// 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 interface, 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
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(clientBuildFS fs.FS) {
// 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 %q", sig)
switch sig {
case syscall.SIGHUP:
Context.clients.Reload()
Context.tls.Reload()
default:
cleanup(context.Background())
cleanupAlways()
os.Exit(0)
}
}
}()
if args.serviceControlAction != "" {
handleServiceControlAction(args, clientBuildFS)
return
}
// run the protection
run(args, clientBuildFS)
}
func setupContext(args options) {
Context.runningAsService = args.runningAsService
Context.disableUpdate = args.disableUpdate ||
version.Channel() == version.ChannelDevelopment
Context.firstRun = detectFirstRun()
if Context.firstRun {
log.Info("This is the first time AdGuard Home is launched")
checkPermissions()
}
switch version.Channel() {
case version.ChannelEdge, version.ChannelDevelopment:
config.BetaBindPort = 3001
default:
// Go on.
}
Context.tlsRoots = LoadSystemRootCAs()
Context.transport = &http.Transport{
DialContext: customDialContext,
Proxy: getHTTPProxy,
TLSClientConfig: &tls.Config{
RootCAs: Context.tlsRoots,
CipherSuites: aghtls.SaferCipherSuites(),
MinVersion: tls.VersionTLS12,
},
}
Context.client = &http.Client{
Timeout: time.Minute * 5,
Transport: Context.transport,
}
if !Context.firstRun {
// Do the upgrade if necessary.
err := upgradeConfig()
fatalOnError(err)
if err = parseConfig(); err != nil {
log.Error("parsing configuration file: %s", err)
os.Exit(1)
}
if args.checkConfig {
log.Info("configuration file is ok")
os.Exit(0)
}
if !args.noEtcHosts && config.Clients.Sources.HostsFile {
err = setupHostsContainer()
fatalOnError(err)
}
}
Context.mux = http.NewServeMux()
}
// logIfUnsupported logs a formatted warning if the error is one of the
// unsupported errors and returns nil. If err is nil, logIfUnsupported returns
// nil. Otherwise, it returns err.
func logIfUnsupported(msg string, err error) (outErr error) {
if errors.As(err, new(*aghos.UnsupportedError)) {
log.Debug(msg, err)
return nil
}
return err
}
// configureOS sets the OS-related configuration.
func configureOS(conf *configuration) (err error) {
osConf := conf.OSConfig
if osConf == nil {
return nil
}
if osConf.Group != "" {
err = aghos.SetGroup(osConf.Group)
err = logIfUnsupported("warning: setting group", err)
if err != nil {
return fmt.Errorf("setting group: %w", err)
}
log.Info("group set to %s", osConf.Group)
}
if osConf.User != "" {
err = aghos.SetUser(osConf.User)
err = logIfUnsupported("warning: setting user", err)
if err != nil {
return fmt.Errorf("setting user: %w", err)
}
log.Info("user set to %s", osConf.User)
}
if osConf.RlimitNoFile != 0 {
err = aghos.SetRlimit(osConf.RlimitNoFile)
err = logIfUnsupported("warning: setting rlimit", err)
if err != nil {
return fmt.Errorf("setting rlimit: %w", err)
}
log.Info("rlimit_nofile set to %d", osConf.RlimitNoFile)
}
return nil
}
// setupHostsContainer initializes the structures to keep up-to-date the hosts
// provided by the OS.
func setupHostsContainer() (err error) {
Context.hostsWatcher, err = aghos.NewOSWritesWatcher()
if err != nil {
return fmt.Errorf("initing hosts watcher: %w", err)
}
Context.etcHosts, err = aghnet.NewHostsContainer(
filtering.SysHostsListID,
aghos.RootDirFS(),
Context.hostsWatcher,
aghnet.DefaultHostsPaths()...,
)
if err != nil {
cerr := Context.hostsWatcher.Close()
if errors.Is(err, aghnet.ErrNoHostsPaths) && cerr == nil {
log.Info("warning: initing hosts container: %s", err)
return nil
}
return errors.WithDeferred(fmt.Errorf("initing hosts container: %w", err), cerr)
}
return nil
}
func setupConfig(args options) (err error) {
config.DNS.DnsfilterConf.EtcHosts = Context.etcHosts
config.DNS.DnsfilterConf.ConfigModified = onConfigModified
config.DNS.DnsfilterConf.HTTPRegister = httpRegister
config.DNS.DnsfilterConf.DataDir = Context.getDataDir()
config.DNS.DnsfilterConf.Filters = slices.Clone(config.Filters)
config.DNS.DnsfilterConf.WhitelistFilters = slices.Clone(config.WhitelistFilters)
config.DNS.DnsfilterConf.UserRules = slices.Clone(config.UserRules)
config.DNS.DnsfilterConf.HTTPClient = Context.client
config.DHCP.WorkDir = Context.workDir
config.DHCP.HTTPRegister = httpRegister
config.DHCP.ConfigModified = onConfigModified
Context.dhcpServer, err = dhcpd.Create(config.DHCP)
if Context.dhcpServer == nil || err != nil {
// TODO(a.garipov): There are a lot of places in the code right
// now which assume that the DHCP server can be nil despite this
// condition. Inspect them and perhaps rewrite them to use
// Enabled() instead.
return fmt.Errorf("initing dhcp: %w", err)
}
Context.updater = updater.NewUpdater(&updater.Config{
Client: Context.client,
Version: version.Version(),
Channel: version.Channel(),
GOARCH: runtime.GOARCH,
GOOS: runtime.GOOS,
GOARM: version.GOARM(),
GOMIPS: version.GOMIPS(),
WorkDir: Context.workDir,
ConfName: config.getConfigFilename(),
})
var arpdb aghnet.ARPDB
if config.Clients.Sources.ARP {
arpdb = aghnet.NewARPDB()
}
Context.clients.Init(config.Clients.Persistent, Context.dhcpServer, Context.etcHosts, arpdb)
if args.bindPort != 0 {
tcpPorts := aghalg.UniqChecker[tcpPort]{}
addPorts(tcpPorts, tcpPort(args.bindPort), tcpPort(config.BetaBindPort))
udpPorts := aghalg.UniqChecker[udpPort]{}
addPorts(udpPorts, udpPort(config.DNS.Port))
if config.TLS.Enabled {
addPorts(
tcpPorts,
tcpPort(config.TLS.PortHTTPS),
tcpPort(config.TLS.PortDNSOverTLS),
tcpPort(config.TLS.PortDNSCrypt),
)
addPorts(udpPorts, udpPort(config.TLS.PortDNSOverQUIC))
}
if err = tcpPorts.Validate(); err != nil {
return fmt.Errorf("validating tcp ports: %w", err)
} else if err = udpPorts.Validate(); err != nil {
return fmt.Errorf("validating udp ports: %w", err)
}
config.BindPort = args.bindPort
}
// override bind host/port from the console
if args.bindHost != nil {
config.BindHost = args.bindHost
}
if len(args.pidFile) != 0 && writePIDFile(args.pidFile) {
Context.pidFileName = args.pidFile
}
return nil
}
func initWeb(args options, clientBuildFS fs.FS) (web *Web, err error) {
var clientFS, clientBetaFS fs.FS
if args.localFrontend {
log.Info("warning: using local frontend files")
clientFS = os.DirFS("build/static")
clientBetaFS = os.DirFS("build2/static")
} else {
clientFS, err = fs.Sub(clientBuildFS, "build/static")
if err != nil {
return nil, fmt.Errorf("getting embedded client subdir: %w", err)
}
clientBetaFS, err = fs.Sub(clientBuildFS, "build2/static")
if err != nil {
return nil, fmt.Errorf("getting embedded beta client subdir: %w", err)
}
}
webConf := webConfig{
firstRun: Context.firstRun,
BindHost: config.BindHost,
BindPort: config.BindPort,
BetaBindPort: config.BetaBindPort,
ReadTimeout: readTimeout,
ReadHeaderTimeout: readHdrTimeout,
WriteTimeout: writeTimeout,
clientFS: clientFS,
clientBetaFS: clientBetaFS,
serveHTTP3: config.DNS.ServeHTTP3,
}
web = newWeb(&webConf)
if web == nil {
return nil, fmt.Errorf("initializing web: %w", err)
}
return web, nil
}
func fatalOnError(err error) {
if err != nil {
log.Fatal(err)
}
}
// run configures and starts AdGuard Home.
func run(args options, clientBuildFS fs.FS) {
// configure config filename
initConfigFilename(args)
// configure working dir and config path
initWorkingDir(args)
// configure log level and output
configureLogger(args)
// Print the first message after logger is configured.
log.Info(version.Full())
log.Debug("current working directory is %s", Context.workDir)
if args.runningAsService {
log.Info("AdGuard Home is running as a service")
}
setupContext(args)
err := configureOS(config)
fatalOnError(err)
// clients package uses filtering package's static data (filtering.BlockedSvcKnown()),
// so we have to initialize filtering's static data first,
// but also avoid relying on automatic Go init() function
filtering.InitModule()
err = setupConfig(args)
fatalOnError(err)
if !Context.firstRun {
// Save the updated config
err = config.write()
fatalOnError(err)
if config.DebugPProf {
mux := http.NewServeMux()
mux.HandleFunc("/debug/pprof/", pprof.Index)
mux.HandleFunc("/debug/pprof/cmdline", pprof.Cmdline)
mux.HandleFunc("/debug/pprof/profile", pprof.Profile)
mux.HandleFunc("/debug/pprof/symbol", pprof.Symbol)
mux.HandleFunc("/debug/pprof/trace", pprof.Trace)
go func() {
log.Info("pprof: listening on localhost:6060")
lerr := http.ListenAndServe("localhost:6060", mux)
log.Error("Error while running the pprof server: %s", lerr)
}()
}
}
err = os.MkdirAll(Context.getDataDir(), 0o755)
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
var rateLimiter *authRateLimiter
if config.AuthAttempts > 0 && config.AuthBlockMin > 0 {
rateLimiter = newAuthRateLimiter(
time.Duration(config.AuthBlockMin)*time.Minute,
config.AuthAttempts,
)
} else {
log.Info("authratelimiter is disabled")
}
Context.auth = InitAuth(
sessFilename,
config.Users,
config.WebSessionTTLHours*60*60,
rateLimiter,
)
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")
}
Context.web, err = initWeb(args, clientBuildFS)
fatalOnError(err)
if !Context.firstRun {
err = initDNSServer()
fatalOnError(err)
Context.tls.Start()
go func() {
serr := startDNSServer()
if serr != nil {
closeDNSServer()
fatalOnError(serr)
}
}()
if Context.dhcpServer != nil {
err = Context.dhcpServer.Start()
if err != nil {
log.Error("starting dhcp server: %s", err)
}
}
}
Context.web.Start()
// wait indefinitely for other go-routines to complete their job
select {}
}
// StartMods initializes and starts the DNS server 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 ok, err := aghnet.CanBindPrivilegedPorts(); !ok || err != nil {
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
err := aghnet.CheckPort("tcp", net.IP{127, 0, 0, 1}, defaultPortDNS)
if err != nil {
if errors.Is(err, os.ErrPermission) {
log.Fatal(`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.Info(
"AdGuard failed to bind to port 53: %s\n\n"+
"Please note, that this is crucial for a DNS server to be able to use that port.",
err,
)
}
log.Info("AdGuard Home can bind to port 53")
}
// Write PID to a file
func writePIDFile(fn string) bool {
data := fmt.Sprintf("%d", os.Getpid())
err := os.WriteFile(fn, []byte(data), 0o644)
if err != nil {
log.Error("Couldn't write PID to file %s: %v", fn, err)
return false
}
return true
}
func initConfigFilename(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"
}
}
// 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)
}
workDir, err := filepath.EvalSymlinks(Context.workDir)
if err != nil {
panic(err)
}
Context.workDir = workDir
}
// 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.File = args.logFile
} else if config.File != "" {
ls.File = config.File
}
// Handle default log settings overrides
ls.Compress = config.Compress
ls.LocalTime = config.LocalTime
ls.MaxBackups = config.MaxBackups
ls.MaxSize = config.MaxSize
ls.MaxAge = config.MaxAge
// log.SetLevel(log.INFO) - default
if ls.Verbose {
log.SetLevel(log.DEBUG)
}
// Make sure that we see the microseconds in logs, as networking stuff can
// happen pretty quickly.
log.SetFlags(log.LstdFlags | log.Lmicroseconds)
if args.runningAsService && ls.File == "" && runtime.GOOS == "windows" {
// When running as a Windows service, use eventlog by default if nothing
// else is configured. Otherwise, we'll simply lose the log output.
ls.File = configSyslog
}
// logs are written to stdout (default)
if ls.File == "" {
return
}
if ls.File == configSyslog {
// Use syslog where it is possible and eventlog on Windows
err := aghos.ConfigureSyslog(serviceName)
if err != nil {
log.Fatalf("cannot initialize syslog: %s", err)
}
} else {
logFilePath := ls.File
if !filepath.IsAbs(logFilePath) {
logFilePath = filepath.Join(Context.workDir, logFilePath)
}
log.SetOutput(&lumberjack.Logger{
Filename: logFilePath,
Compress: ls.Compress, // disabled by default
LocalTime: ls.LocalTime,
MaxBackups: ls.MaxBackups,
MaxSize: ls.MaxSize, // megabytes
MaxAge: ls.MaxAge, // days
})
}
}
// cleanup stops and resets all the modules.
func cleanup(ctx context.Context) {
log.Info("stopping AdGuard Home")
if Context.web != nil {
Context.web.Close(ctx)
Context.web = nil
}
if Context.auth != nil {
Context.auth.Close()
Context.auth = nil
}
err := stopDNSServer()
if err != nil {
log.Error("stopping dns server: %s", err)
}
if Context.dhcpServer != nil {
err = Context.dhcpServer.Stop()
if err != nil {
log.Error("stopping dhcp server: %s", err)
}
}
if Context.etcHosts != nil {
// Currently Context.hostsWatcher is only used in Context.etcHosts and
// needs closing only in case of the successful initialization of
// Context.etcHosts.
if err = Context.hostsWatcher.Close(); err != nil {
log.Error("closing hosts watcher: %s", err)
}
if err = Context.etcHosts.Close(); err != nil {
log.Error("closing hosts container: %s", err)
}
}
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
}
// printWebAddrs prints addresses built from proto, addr, and an appropriate
// port. At least one address is printed with the value of port. If the value
// of betaPort is 0, the second address is not printed. Output example:
//
// Go to http://127.0.0.1:80
// Go to http://127.0.0.1:3000 (BETA)
func printWebAddrs(proto, addr string, port, betaPort int) {
const (
hostMsg = "Go to %s://%s"
hostBetaMsg = hostMsg + " (BETA)"
)
log.Printf(hostMsg, proto, netutil.JoinHostPort(addr, port))
if betaPort == 0 {
return
}
log.Printf(hostBetaMsg, proto, netutil.JoinHostPort(addr, config.BetaBindPort))
}
// printHTTPAddresses prints the IP addresses which user can use to access the
// admin interface. proto is either schemeHTTP or schemeHTTPS.
func printHTTPAddresses(proto string) {
tlsConf := tlsConfigSettings{}
if Context.tls != nil {
Context.tls.WriteDiskConfig(&tlsConf)
}
port := config.BindPort
if proto == aghhttp.SchemeHTTPS {
port = tlsConf.PortHTTPS
}
// TODO(e.burkov): Inspect and perhaps merge with the previous condition.
if proto == aghhttp.SchemeHTTPS && tlsConf.ServerName != "" {
printWebAddrs(proto, tlsConf.ServerName, tlsConf.PortHTTPS, 0)
return
}
bindhost := config.BindHost
if !bindhost.IsUnspecified() {
printWebAddrs(proto, bindhost.String(), port, config.BetaBindPort)
return
}
ifaces, err := aghnet.GetValidNetInterfacesForWeb()
if err != nil {
log.Error("web: getting iface ips: %s", err)
// That's weird, but we'll ignore it.
//
// TODO(e.burkov): Find out when it happens.
printWebAddrs(proto, bindhost.String(), port, config.BetaBindPort)
return
}
for _, iface := range ifaces {
for _, addr := range iface.Addresses {
printWebAddrs(proto, addr.String(), config.BindPort, config.BetaBindPort)
}
}
}
// -------------------
// first run / install
// -------------------
func detectFirstRun() bool {
configfile := Context.configFilename
if !filepath.IsAbs(configfile) {
configfile = filepath.Join(Context.workDir, Context.configFilename)
}
_, err := os.Stat(configfile)
return errors.Is(err, os.ErrNotExist)
}
// Connect to a remote server resolving hostname using our own DNS server.
//
// TODO(e.burkov): This messy logic should be decomposed and clarified.
func customDialContext(ctx context.Context, network, addr string) (conn net.Conn, err 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 {
return dialer.DialContext(ctx, network, addr)
}
addrs, err := Context.dnsServer.Resolve(host)
log.Debug("dnsServer.Resolve: %s: %v", host, addrs)
if err != nil {
return nil, err
}
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)
conn, err = dialer.DialContext(ctx, network, addr)
if err != nil {
dialErrs = append(dialErrs, err)
continue
}
return conn, err
}
return nil, errors.List(fmt.Sprintf("couldn't dial to %s", addr), dialErrs...)
}
func getHTTPProxy(_ *http.Request) (*url.URL, error) {
if config.ProxyURL == "" {
return nil, nil
}
return url.Parse(config.ProxyURL)
}
// jsonError is a generic JSON error response.
//
// TODO(a.garipov): Merge together with the implementations in .../dhcpd and
// other packages after refactoring the web handler registering.
type jsonError struct {
// Message is the error message, an opaque string.
Message string `json:"message"`
}