559 lines
14 KiB
Go
559 lines
14 KiB
Go
package server
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import (
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"context"
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"errors"
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"fmt"
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stdlog "log"
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"net"
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"net/http"
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"sync"
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"syscall"
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"time"
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"github.com/pires/go-proxyproto"
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"github.com/sirupsen/logrus"
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"github.com/traefik/traefik/v2/pkg/config/static"
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"github.com/traefik/traefik/v2/pkg/ip"
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"github.com/traefik/traefik/v2/pkg/log"
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"github.com/traefik/traefik/v2/pkg/middlewares"
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"github.com/traefik/traefik/v2/pkg/middlewares/forwardedheaders"
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"github.com/traefik/traefik/v2/pkg/safe"
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"github.com/traefik/traefik/v2/pkg/server/router"
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"github.com/traefik/traefik/v2/pkg/tcp"
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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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var httpServerLogger = stdlog.New(log.WithoutContext().WriterLevel(logrus.DebugLevel), "", 0)
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type httpForwarder struct {
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net.Listener
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connChan chan net.Conn
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errChan chan error
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}
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func newHTTPForwarder(ln net.Listener) *httpForwarder {
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return &httpForwarder{
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Listener: ln,
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connChan: make(chan net.Conn),
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errChan: make(chan error),
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}
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}
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// ServeTCP uses the connection to serve it later in "Accept".
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func (h *httpForwarder) ServeTCP(conn tcp.WriteCloser) {
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h.connChan <- conn
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}
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// Accept retrieves a served connection in ServeTCP.
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func (h *httpForwarder) Accept() (net.Conn, error) {
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select {
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case conn := <-h.connChan:
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return conn, nil
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case err := <-h.errChan:
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return nil, err
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}
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}
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// TCPEntryPoints holds a map of TCPEntryPoint (the entrypoint names being the keys).
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type TCPEntryPoints map[string]*TCPEntryPoint
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// NewTCPEntryPoints creates a new TCPEntryPoints.
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func NewTCPEntryPoints(entryPointsConfig static.EntryPoints) (TCPEntryPoints, error) {
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serverEntryPointsTCP := make(TCPEntryPoints)
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for entryPointName, config := range entryPointsConfig {
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protocol, err := config.GetProtocol()
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if err != nil {
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return nil, fmt.Errorf("error while building entryPoint %s: %w", entryPointName, err)
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}
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if protocol != "tcp" {
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continue
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}
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ctx := log.With(context.Background(), log.Str(log.EntryPointName, entryPointName))
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serverEntryPointsTCP[entryPointName], err = NewTCPEntryPoint(ctx, config)
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if err != nil {
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return nil, fmt.Errorf("error while building entryPoint %s: %w", entryPointName, err)
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}
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}
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return serverEntryPointsTCP, nil
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}
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// Start the server entry points.
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func (eps TCPEntryPoints) Start() {
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for entryPointName, serverEntryPoint := range eps {
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ctx := log.With(context.Background(), log.Str(log.EntryPointName, entryPointName))
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go serverEntryPoint.Start(ctx)
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}
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}
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// Stop the server entry points.
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func (eps TCPEntryPoints) Stop() {
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var wg sync.WaitGroup
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for epn, ep := range eps {
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wg.Add(1)
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go func(entryPointName string, entryPoint *TCPEntryPoint) {
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defer wg.Done()
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ctx := log.With(context.Background(), log.Str(log.EntryPointName, entryPointName))
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entryPoint.Shutdown(ctx)
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log.FromContext(ctx).Debugf("Entry point %s closed", entryPointName)
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}(epn, ep)
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}
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wg.Wait()
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}
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// Switch the TCP routers.
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func (eps TCPEntryPoints) Switch(routersTCP map[string]*tcp.Router) {
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for entryPointName, rt := range routersTCP {
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eps[entryPointName].SwitchRouter(rt)
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}
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}
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// TCPEntryPoint is the TCP server.
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type TCPEntryPoint struct {
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listener net.Listener
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switcher *tcp.HandlerSwitcher
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transportConfiguration *static.EntryPointsTransport
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tracker *connectionTracker
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httpServer *httpServer
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httpsServer *httpServer
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http3Server *http3server
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}
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// NewTCPEntryPoint creates a new TCPEntryPoint.
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func NewTCPEntryPoint(ctx context.Context, configuration *static.EntryPoint) (*TCPEntryPoint, error) {
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tracker := newConnectionTracker()
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listener, err := buildListener(ctx, configuration)
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if err != nil {
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return nil, fmt.Errorf("error preparing server: %w", err)
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}
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rt := &tcp.Router{}
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httpServer, err := createHTTPServer(ctx, listener, configuration, true)
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if err != nil {
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return nil, fmt.Errorf("error preparing httpServer: %w", err)
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}
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rt.HTTPForwarder(httpServer.Forwarder)
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httpsServer, err := createHTTPServer(ctx, listener, configuration, false)
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if err != nil {
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return nil, fmt.Errorf("error preparing httpsServer: %w", err)
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}
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h3server, err := newHTTP3Server(ctx, configuration, httpsServer)
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if err != nil {
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return nil, err
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}
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rt.HTTPSForwarder(httpsServer.Forwarder)
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tcpSwitcher := &tcp.HandlerSwitcher{}
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tcpSwitcher.Switch(rt)
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return &TCPEntryPoint{
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listener: listener,
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switcher: tcpSwitcher,
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transportConfiguration: configuration.Transport,
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tracker: tracker,
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httpServer: httpServer,
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httpsServer: httpsServer,
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http3Server: h3server,
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}, nil
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}
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// Start starts the TCP server.
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func (e *TCPEntryPoint) Start(ctx context.Context) {
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logger := log.FromContext(ctx)
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logger.Debugf("Start TCP Server")
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if e.http3Server != nil {
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go func() { _ = e.http3Server.Start() }()
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}
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for {
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conn, err := e.listener.Accept()
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if err != nil {
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logger.Error(err)
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var netErr net.Error
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if errors.As(err, &netErr) && netErr.Temporary() {
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continue
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}
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e.httpServer.Forwarder.errChan <- err
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e.httpsServer.Forwarder.errChan <- err
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return
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}
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writeCloser, err := writeCloser(conn)
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if err != nil {
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panic(err)
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}
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safe.Go(func() {
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// Enforce read/write deadlines at the connection level,
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// because when we're peeking the first byte to determine whether we are doing TLS,
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// the deadlines at the server level are not taken into account.
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if e.transportConfiguration.RespondingTimeouts.ReadTimeout > 0 {
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err := writeCloser.SetReadDeadline(time.Now().Add(time.Duration(e.transportConfiguration.RespondingTimeouts.ReadTimeout)))
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if err != nil {
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logger.Errorf("Error while setting read deadline: %v", err)
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}
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}
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if e.transportConfiguration.RespondingTimeouts.WriteTimeout > 0 {
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err = writeCloser.SetWriteDeadline(time.Now().Add(time.Duration(e.transportConfiguration.RespondingTimeouts.WriteTimeout)))
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if err != nil {
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logger.Errorf("Error while setting write deadline: %v", err)
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}
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}
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e.switcher.ServeTCP(newTrackedConnection(writeCloser, e.tracker))
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})
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}
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}
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// Shutdown stops the TCP connections.
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func (e *TCPEntryPoint) Shutdown(ctx context.Context) {
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logger := log.FromContext(ctx)
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reqAcceptGraceTimeOut := time.Duration(e.transportConfiguration.LifeCycle.RequestAcceptGraceTimeout)
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if reqAcceptGraceTimeOut > 0 {
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logger.Infof("Waiting %s for incoming requests to cease", reqAcceptGraceTimeOut)
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time.Sleep(reqAcceptGraceTimeOut)
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}
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graceTimeOut := time.Duration(e.transportConfiguration.LifeCycle.GraceTimeOut)
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ctx, cancel := context.WithTimeout(ctx, graceTimeOut)
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logger.Debugf("Waiting %s seconds before killing connections.", graceTimeOut)
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var wg sync.WaitGroup
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shutdownServer := func(server stoppable) {
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defer wg.Done()
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err := server.Shutdown(ctx)
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if err == nil {
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return
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}
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if errors.Is(ctx.Err(), context.DeadlineExceeded) {
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logger.Debugf("Server failed to shutdown within deadline because: %s", err)
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if err = server.Close(); err != nil {
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logger.Error(err)
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}
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return
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}
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logger.Error(err)
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// We expect Close to fail again because Shutdown most likely failed when trying to close a listener.
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// We still call it however, to make sure that all connections get closed as well.
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server.Close()
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}
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if e.httpServer.Server != nil {
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wg.Add(1)
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go shutdownServer(e.httpServer.Server)
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}
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if e.httpsServer.Server != nil {
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wg.Add(1)
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go shutdownServer(e.httpsServer.Server)
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if e.http3Server != nil {
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wg.Add(1)
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go shutdownServer(e.http3Server)
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}
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}
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if e.tracker != nil {
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wg.Add(1)
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go func() {
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defer wg.Done()
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err := e.tracker.Shutdown(ctx)
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if err == nil {
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return
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}
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if errors.Is(ctx.Err(), context.DeadlineExceeded) {
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logger.Debugf("Server failed to shutdown before deadline because: %s", err)
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}
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e.tracker.Close()
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}()
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}
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wg.Wait()
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cancel()
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}
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// SwitchRouter switches the TCP router handler.
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func (e *TCPEntryPoint) SwitchRouter(rt *tcp.Router) {
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rt.HTTPForwarder(e.httpServer.Forwarder)
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httpHandler := rt.GetHTTPHandler()
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if httpHandler == nil {
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httpHandler = router.BuildDefaultHTTPRouter()
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}
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e.httpServer.Switcher.UpdateHandler(httpHandler)
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rt.HTTPSForwarder(e.httpsServer.Forwarder)
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httpsHandler := rt.GetHTTPSHandler()
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if httpsHandler == nil {
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httpsHandler = router.BuildDefaultHTTPRouter()
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}
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e.httpsServer.Switcher.UpdateHandler(httpsHandler)
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e.switcher.Switch(rt)
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if e.http3Server != nil {
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e.http3Server.Switch(rt)
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}
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}
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// writeCloserWrapper wraps together a connection, and the concrete underlying
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// connection type that was found to satisfy WriteCloser.
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type writeCloserWrapper struct {
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net.Conn
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writeCloser tcp.WriteCloser
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}
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func (c *writeCloserWrapper) CloseWrite() error {
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return c.writeCloser.CloseWrite()
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}
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// writeCloser returns the given connection, augmented with the WriteCloser
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// implementation, if any was found within the underlying conn.
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func writeCloser(conn net.Conn) (tcp.WriteCloser, error) {
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switch typedConn := conn.(type) {
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case *proxyproto.Conn:
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underlying, ok := typedConn.TCPConn()
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if !ok {
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return nil, fmt.Errorf("underlying connection is not a tcp connection")
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}
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return &writeCloserWrapper{writeCloser: underlying, Conn: typedConn}, nil
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case *net.TCPConn:
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return typedConn, nil
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default:
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return nil, fmt.Errorf("unknown connection type %T", typedConn)
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}
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}
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// tcpKeepAliveListener sets TCP keep-alive timeouts on accepted
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// connections.
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type tcpKeepAliveListener struct {
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*net.TCPListener
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}
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func (ln tcpKeepAliveListener) Accept() (net.Conn, error) {
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tc, err := ln.AcceptTCP()
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if err != nil {
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return nil, err
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}
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if err = tc.SetKeepAlive(true); err != nil {
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return nil, err
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}
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if err = tc.SetKeepAlivePeriod(3 * time.Minute); err != nil {
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// Some systems, such as OpenBSD, have no user-settable per-socket TCP
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// keepalive options.
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if !errors.Is(err, syscall.ENOPROTOOPT) {
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return nil, err
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}
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}
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return tc, nil
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}
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func buildProxyProtocolListener(ctx context.Context, entryPoint *static.EntryPoint, listener net.Listener) (net.Listener, error) {
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proxyListener := &proxyproto.Listener{Listener: listener}
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if entryPoint.ProxyProtocol.Insecure {
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log.FromContext(ctx).Infof("Enabling ProxyProtocol without trusted IPs: Insecure")
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return proxyListener, nil
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}
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checker, err := ip.NewChecker(entryPoint.ProxyProtocol.TrustedIPs)
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if err != nil {
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return nil, err
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}
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proxyListener.Policy = func(upstream net.Addr) (proxyproto.Policy, error) {
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ipAddr, ok := upstream.(*net.TCPAddr)
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if !ok {
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return proxyproto.REJECT, fmt.Errorf("type error %v", upstream)
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}
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if !checker.ContainsIP(ipAddr.IP) {
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log.FromContext(ctx).Debugf("IP %s is not in trusted IPs list, ignoring ProxyProtocol Headers and bypass connection", ipAddr.IP)
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return proxyproto.IGNORE, nil
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}
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return proxyproto.USE, nil
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}
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log.FromContext(ctx).Infof("Enabling ProxyProtocol for trusted IPs %v", entryPoint.ProxyProtocol.TrustedIPs)
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return proxyListener, nil
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}
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func buildListener(ctx context.Context, entryPoint *static.EntryPoint) (net.Listener, error) {
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listener, err := net.Listen("tcp", entryPoint.GetAddress())
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if err != nil {
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return nil, fmt.Errorf("error opening listener: %w", err)
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}
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listener = tcpKeepAliveListener{listener.(*net.TCPListener)}
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if entryPoint.ProxyProtocol != nil {
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listener, err = buildProxyProtocolListener(ctx, entryPoint, listener)
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if err != nil {
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return nil, fmt.Errorf("error creating proxy protocol listener: %w", err)
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}
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}
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return listener, nil
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}
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func newConnectionTracker() *connectionTracker {
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return &connectionTracker{
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conns: make(map[net.Conn]struct{}),
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}
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}
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type connectionTracker struct {
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conns map[net.Conn]struct{}
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lock sync.RWMutex
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}
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// AddConnection add a connection in the tracked connections list.
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func (c *connectionTracker) AddConnection(conn net.Conn) {
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c.lock.Lock()
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defer c.lock.Unlock()
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c.conns[conn] = struct{}{}
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}
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// RemoveConnection remove a connection from the tracked connections list.
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func (c *connectionTracker) RemoveConnection(conn net.Conn) {
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c.lock.Lock()
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defer c.lock.Unlock()
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delete(c.conns, conn)
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}
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func (c *connectionTracker) isEmpty() bool {
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c.lock.RLock()
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defer c.lock.RUnlock()
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return len(c.conns) == 0
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}
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// Shutdown wait for the connection closing.
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func (c *connectionTracker) Shutdown(ctx context.Context) error {
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ticker := time.NewTicker(500 * time.Millisecond)
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defer ticker.Stop()
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for {
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if c.isEmpty() {
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return nil
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}
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select {
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case <-ctx.Done():
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return ctx.Err()
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case <-ticker.C:
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}
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}
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}
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// Close close all the connections in the tracked connections list.
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func (c *connectionTracker) Close() {
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c.lock.Lock()
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defer c.lock.Unlock()
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for conn := range c.conns {
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if err := conn.Close(); err != nil {
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log.WithoutContext().Errorf("Error while closing connection: %v", err)
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}
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delete(c.conns, conn)
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}
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}
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type stoppable interface {
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Shutdown(context.Context) error
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Close() error
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}
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type stoppableServer interface {
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stoppable
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Serve(listener net.Listener) error
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}
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type httpServer struct {
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Server stoppableServer
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Forwarder *httpForwarder
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Switcher *middlewares.HTTPHandlerSwitcher
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}
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func createHTTPServer(ctx context.Context, ln net.Listener, configuration *static.EntryPoint, withH2c bool) (*httpServer, error) {
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httpSwitcher := middlewares.NewHandlerSwitcher(router.BuildDefaultHTTPRouter())
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var handler http.Handler
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var err error
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handler, err = forwardedheaders.NewXForwarded(
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configuration.ForwardedHeaders.Insecure,
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configuration.ForwardedHeaders.TrustedIPs,
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httpSwitcher)
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if err != nil {
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return nil, err
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}
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if withH2c {
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handler = h2c.NewHandler(handler, &http2.Server{})
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}
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serverHTTP := &http.Server{
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Handler: handler,
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ErrorLog: httpServerLogger,
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ReadTimeout: time.Duration(configuration.Transport.RespondingTimeouts.ReadTimeout),
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WriteTimeout: time.Duration(configuration.Transport.RespondingTimeouts.WriteTimeout),
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IdleTimeout: time.Duration(configuration.Transport.RespondingTimeouts.IdleTimeout),
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}
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listener := newHTTPForwarder(ln)
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go func() {
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err := serverHTTP.Serve(listener)
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if err != nil && !errors.Is(err, http.ErrServerClosed) {
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log.FromContext(ctx).Errorf("Error while starting server: %v", err)
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}
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}()
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return &httpServer{
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Server: serverHTTP,
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Forwarder: listener,
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Switcher: httpSwitcher,
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}, nil
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}
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func newTrackedConnection(conn tcp.WriteCloser, tracker *connectionTracker) *trackedConnection {
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tracker.AddConnection(conn)
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return &trackedConnection{
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WriteCloser: conn,
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tracker: tracker,
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}
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}
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type trackedConnection struct {
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tracker *connectionTracker
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tcp.WriteCloser
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}
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func (t *trackedConnection) Close() error {
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t.tracker.RemoveConnection(t.WriteCloser)
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return t.WriteCloser.Close()
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}
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