mirror of
https://github.com/AdguardTeam/AdGuardHome.git
synced 2024-12-15 19:41:36 +03:00
300 lines
8.1 KiB
Go
300 lines
8.1 KiB
Go
package home
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import (
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"context"
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"crypto/tls"
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"io/fs"
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"net/http"
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"net/netip"
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"sync"
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"time"
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"github.com/AdguardTeam/AdGuardHome/internal/aghhttp"
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"github.com/AdguardTeam/AdGuardHome/internal/aghnet"
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"github.com/AdguardTeam/golibs/errors"
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"github.com/AdguardTeam/golibs/log"
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"github.com/AdguardTeam/golibs/netutil"
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"github.com/NYTimes/gziphandler"
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"github.com/quic-go/quic-go"
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"github.com/quic-go/quic-go/http3"
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"golang.org/x/net/http2"
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"golang.org/x/net/http2/h2c"
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)
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const (
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// readTimeout is the maximum duration for reading the entire request,
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// including the body.
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readTimeout = 60 * time.Second
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// readHdrTimeout is the amount of time allowed to read request headers.
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readHdrTimeout = 60 * time.Second
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// writeTimeout is the maximum duration before timing out writes of the
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// response.
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writeTimeout = 60 * time.Second
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)
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type webConfig struct {
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clientFS fs.FS
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BindHost netip.Addr
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BindPort int
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// ReadTimeout is an option to pass to http.Server for setting an
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// appropriate field.
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ReadTimeout time.Duration
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// ReadHeaderTimeout is an option to pass to http.Server for setting an
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// appropriate field.
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ReadHeaderTimeout time.Duration
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// WriteTimeout is an option to pass to http.Server for setting an
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// appropriate field.
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WriteTimeout time.Duration
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firstRun bool
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serveHTTP3 bool
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}
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// httpsServer contains the data for the HTTPS server.
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type httpsServer struct {
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// server is the pre-HTTP/3 HTTPS server.
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server *http.Server
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// server3 is the HTTP/3 HTTPS server. If it is not nil,
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// [httpsServer.server] must also be non-nil.
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server3 *http3.Server
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// TODO(a.garipov): Why is there a *sync.Cond here? Remove.
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cond *sync.Cond
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condLock sync.Mutex
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cert tls.Certificate
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inShutdown bool
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enabled bool
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}
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// webAPI is the web UI and API server.
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type webAPI struct {
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conf *webConfig
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// TODO(a.garipov): Refactor all these servers.
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httpServer *http.Server
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// httpsServer is the server that handles HTTPS traffic. If it is not nil,
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// [Web.http3Server] must also not be nil.
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httpsServer httpsServer
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}
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// newWebAPI creates a new instance of the web UI and API server.
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func newWebAPI(conf *webConfig) (w *webAPI) {
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log.Info("web: initializing")
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w = &webAPI{
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conf: conf,
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}
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clientFS := http.FileServer(http.FS(conf.clientFS))
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// if not configured, redirect / to /install.html, otherwise redirect /install.html to /
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Context.mux.Handle("/", withMiddlewares(clientFS, gziphandler.GzipHandler, optionalAuthHandler, postInstallHandler))
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// add handlers for /install paths, we only need them when we're not configured yet
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if conf.firstRun {
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log.Info("This is the first launch of AdGuard Home, redirecting everything to /install.html ")
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Context.mux.Handle("/install.html", preInstallHandler(clientFS))
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w.registerInstallHandlers()
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} else {
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registerControlHandlers()
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}
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w.httpsServer.cond = sync.NewCond(&w.httpsServer.condLock)
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return w
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}
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// webCheckPortAvailable checks if port, which is considered an HTTPS port, is
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// available, unless the HTTPS server isn't active.
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//
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// TODO(a.garipov): Adapt for HTTP/3.
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func webCheckPortAvailable(port int) (ok bool) {
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if Context.web.httpsServer.server != nil {
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return true
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}
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return aghnet.CheckPort("tcp", netip.AddrPortFrom(config.BindHost, uint16(port))) == nil
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}
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// tlsConfigChanged updates the TLS configuration and restarts the HTTPS server
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// if necessary.
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func (web *webAPI) tlsConfigChanged(ctx context.Context, tlsConf tlsConfigSettings) {
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log.Debug("web: applying new tls configuration")
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enabled := tlsConf.Enabled &&
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tlsConf.PortHTTPS != 0 &&
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len(tlsConf.PrivateKeyData) != 0 &&
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len(tlsConf.CertificateChainData) != 0
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var cert tls.Certificate
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var err error
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if enabled {
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cert, err = tls.X509KeyPair(tlsConf.CertificateChainData, tlsConf.PrivateKeyData)
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if err != nil {
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log.Fatal(err)
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}
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}
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web.httpsServer.cond.L.Lock()
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if web.httpsServer.server != nil {
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var cancel context.CancelFunc
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ctx, cancel = context.WithTimeout(ctx, shutdownTimeout)
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shutdownSrv(ctx, web.httpsServer.server)
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shutdownSrv3(web.httpsServer.server3)
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cancel()
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}
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web.httpsServer.enabled = enabled
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web.httpsServer.cert = cert
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web.httpsServer.cond.Broadcast()
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web.httpsServer.cond.L.Unlock()
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}
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// start - start serving HTTP requests
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func (web *webAPI) start() {
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log.Println("AdGuard Home is available at the following addresses:")
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// for https, we have a separate goroutine loop
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go web.tlsServerLoop()
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// this loop is used as an ability to change listening host and/or port
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for !web.httpsServer.inShutdown {
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printHTTPAddresses(aghhttp.SchemeHTTP)
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errs := make(chan error, 2)
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// Use an h2c handler to support unencrypted HTTP/2, e.g. for proxies.
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hdlr := h2c.NewHandler(withMiddlewares(Context.mux, limitRequestBody), &http2.Server{})
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// Create a new instance, because the Web is not usable after Shutdown.
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hostStr := web.conf.BindHost.String()
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web.httpServer = &http.Server{
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ErrorLog: log.StdLog("web: plain", log.DEBUG),
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Addr: netutil.JoinHostPort(hostStr, web.conf.BindPort),
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Handler: hdlr,
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ReadTimeout: web.conf.ReadTimeout,
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ReadHeaderTimeout: web.conf.ReadHeaderTimeout,
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WriteTimeout: web.conf.WriteTimeout,
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}
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go func() {
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defer log.OnPanic("web: plain")
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errs <- web.httpServer.ListenAndServe()
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}()
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err := <-errs
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if !errors.Is(err, http.ErrServerClosed) {
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cleanupAlways()
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log.Fatal(err)
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}
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// We use ErrServerClosed as a sign that we need to rebind on a new
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// address, so go back to the start of the loop.
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}
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}
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// close gracefully shuts down the HTTP servers.
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func (web *webAPI) close(ctx context.Context) {
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log.Info("stopping http server...")
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web.httpsServer.cond.L.Lock()
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web.httpsServer.inShutdown = true
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web.httpsServer.cond.L.Unlock()
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var cancel context.CancelFunc
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ctx, cancel = context.WithTimeout(ctx, shutdownTimeout)
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defer cancel()
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shutdownSrv(ctx, web.httpsServer.server)
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shutdownSrv3(web.httpsServer.server3)
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shutdownSrv(ctx, web.httpServer)
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log.Info("stopped http server")
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}
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func (web *webAPI) tlsServerLoop() {
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for {
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web.httpsServer.cond.L.Lock()
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if web.httpsServer.inShutdown {
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web.httpsServer.cond.L.Unlock()
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break
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}
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// this mechanism doesn't let us through until all conditions are met
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for !web.httpsServer.enabled { // sleep until necessary data is supplied
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web.httpsServer.cond.Wait()
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if web.httpsServer.inShutdown {
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web.httpsServer.cond.L.Unlock()
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return
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}
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}
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web.httpsServer.cond.L.Unlock()
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var portHTTPS int
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func() {
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config.RLock()
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defer config.RUnlock()
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portHTTPS = config.TLS.PortHTTPS
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}()
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addr := netutil.JoinHostPort(web.conf.BindHost.String(), portHTTPS)
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web.httpsServer.server = &http.Server{
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ErrorLog: log.StdLog("web: https", log.DEBUG),
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Addr: addr,
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TLSConfig: &tls.Config{
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Certificates: []tls.Certificate{web.httpsServer.cert},
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RootCAs: Context.tlsRoots,
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CipherSuites: Context.tlsCipherIDs,
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MinVersion: tls.VersionTLS12,
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},
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Handler: withMiddlewares(Context.mux, limitRequestBody),
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ReadTimeout: web.conf.ReadTimeout,
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ReadHeaderTimeout: web.conf.ReadHeaderTimeout,
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WriteTimeout: web.conf.WriteTimeout,
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}
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printHTTPAddresses(aghhttp.SchemeHTTPS)
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if web.conf.serveHTTP3 {
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go web.mustStartHTTP3(addr)
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}
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log.Debug("web: starting https server")
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err := web.httpsServer.server.ListenAndServeTLS("", "")
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if !errors.Is(err, http.ErrServerClosed) {
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cleanupAlways()
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log.Fatalf("web: https: %s", err)
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}
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}
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}
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func (web *webAPI) mustStartHTTP3(address string) {
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defer log.OnPanic("web: http3")
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web.httpsServer.server3 = &http3.Server{
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// TODO(a.garipov): See if there is a way to use the error log as
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// well as timeouts here.
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Addr: address,
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TLSConfig: &tls.Config{
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Certificates: []tls.Certificate{web.httpsServer.cert},
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RootCAs: Context.tlsRoots,
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CipherSuites: Context.tlsCipherIDs,
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MinVersion: tls.VersionTLS12,
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},
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Handler: withMiddlewares(Context.mux, limitRequestBody),
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}
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log.Debug("web: starting http/3 server")
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err := web.httpsServer.server3.ListenAndServe()
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if !errors.Is(err, quic.ErrServerClosed) {
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cleanupAlways()
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log.Fatalf("web: http3: %s", err)
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}
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}
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