imap: add timeout to tcp connect functions
Extract the tcp connection details and timeout the tcp connect functions (net.ResolveTCPAddr and net.DialTCP). If timed out, ensure that the connection is properly closed. Signed-off-by: Koni Marti <koni.marti@gmail.com> Acked-by: Robin Jarry <robin@jarry.cc>
This commit is contained in:
Koni Marti
Robin Jarry
parent
b92efe4cd9
commit
b29293d7b5
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@ -0,0 +1,178 @@
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package imap
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import (
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"crypto/tls"
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"fmt"
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"net"
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"time"
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"git.sr.ht/~rjarry/aerc/lib"
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"github.com/emersion/go-imap"
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"github.com/emersion/go-imap/client"
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)
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// connect establishes a new tcp connection to the imap server, logs in and
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// selects the default inbox. If no error is returned, the imap client will be
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// in the imap.SelectedState.
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func (w *IMAPWorker) connect() (*client.Client, error) {
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var (
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conn *net.TCPConn
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err error
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c *client.Client
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)
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conn, err = newTCPConn(w.config.addr, w.config.connection_timeout)
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if conn == nil || err != nil {
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return nil, err
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}
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if w.config.connection_timeout > 0 {
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end := time.Now().Add(w.config.connection_timeout)
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err = conn.SetDeadline(end)
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if err != nil {
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return nil, err
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}
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}
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if w.config.keepalive_period > 0 {
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err = w.setKeepaliveParameters(conn)
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if err != nil {
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return nil, err
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}
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}
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serverName, _, _ := net.SplitHostPort(w.config.addr)
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tlsConfig := &tls.Config{ServerName: serverName}
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switch w.config.scheme {
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case "imap":
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c, err = client.New(conn)
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if err != nil {
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return nil, err
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}
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if !w.config.insecure {
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if err = c.StartTLS(tlsConfig); err != nil {
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return nil, err
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}
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}
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case "imaps":
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tlsConn := tls.Client(conn, tlsConfig)
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c, err = client.New(tlsConn)
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if err != nil {
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return nil, err
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}
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default:
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return nil, fmt.Errorf("Unknown IMAP scheme %s", w.config.scheme)
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}
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c.ErrorLog = w.worker.Logger
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if w.config.user != nil {
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username := w.config.user.Username()
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password, hasPassword := w.config.user.Password()
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if !hasPassword {
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// TODO: ask password
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}
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if w.config.oauthBearer.Enabled {
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if err := w.config.oauthBearer.Authenticate(
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username, password, c); err != nil {
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return nil, err
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}
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} else if err := c.Login(username, password); err != nil {
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return nil, err
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}
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}
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c.SetDebug(w.worker.Logger.Writer())
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if _, err := c.Select(imap.InboxName, false); err != nil {
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return nil, err
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}
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return c, nil
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}
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// newTCPConn establishes a new tcp connection. Timeout will ensure that the
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// function does not hang when there is no connection. If there is a timeout,
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// but a valid connection is eventually returned, ensure that it is properly
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// closed.
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func newTCPConn(addr string, timeout time.Duration) (*net.TCPConn, error) {
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var errTCPTimeout = fmt.Errorf("tcp connection timeout")
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type tcpConn struct {
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conn *net.TCPConn
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err error
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}
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done := make(chan tcpConn)
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go func() {
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addr, err := net.ResolveTCPAddr("tcp", addr)
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if err != nil {
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done <- tcpConn{nil, err}
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return
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}
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newConn, err := net.DialTCP("tcp", nil, addr)
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if err != nil {
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done <- tcpConn{nil, err}
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return
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}
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done <- tcpConn{newConn, nil}
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return
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}()
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select {
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case <-time.After(timeout):
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go func() {
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if tcpResult := <-done; tcpResult.conn != nil {
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tcpResult.conn.Close()
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}
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}()
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return nil, errTCPTimeout
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case tcpResult := <-done:
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if tcpResult.conn == nil || tcpResult.err != nil {
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return nil, tcpResult.err
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}
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return tcpResult.conn, nil
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}
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}
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// Set additional keepalive parameters.
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// Uses new interfaces introduced in Go1.11, which let us get connection's file
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// descriptor, without blocking, and therefore without uncontrolled spawning of
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// threads (not goroutines, actual threads).
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func (w *IMAPWorker) setKeepaliveParameters(conn *net.TCPConn) error {
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err := conn.SetKeepAlive(true)
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if err != nil {
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return err
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}
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// Idle time before sending a keepalive probe
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err = conn.SetKeepAlivePeriod(w.config.keepalive_period)
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if err != nil {
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return err
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}
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rawConn, e := conn.SyscallConn()
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if e != nil {
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return e
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}
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err = rawConn.Control(func(fdPtr uintptr) {
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fd := int(fdPtr)
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// Max number of probes before failure
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err := lib.SetTcpKeepaliveProbes(fd, w.config.keepalive_probes)
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if err != nil {
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w.worker.Logger.Printf(
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"cannot set tcp keepalive probes: %v\n", err)
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}
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// Wait time after an unsuccessful probe
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err = lib.SetTcpKeepaliveInterval(fd, w.config.keepalive_interval)
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if err != nil {
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w.worker.Logger.Printf(
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"cannot set tcp keepalive interval: %v\n", err)
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}
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})
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return err
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}
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@ -1,9 +1,7 @@
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package imap
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import (
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"crypto/tls"
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"fmt"
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"net"
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"net/url"
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"time"
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@ -25,6 +23,7 @@ func init() {
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var (
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errUnsupported = fmt.Errorf("unsupported command")
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errClientNotReady = fmt.Errorf("client not ready")
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errNotConnected = fmt.Errorf("not connected")
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errAlreadyConnected = fmt.Errorf("already connected")
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)
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@ -93,6 +92,15 @@ func (w *IMAPWorker) handleMessage(msg types.WorkerMessage) error {
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var reterr error // will be returned at the end, needed to support idle
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// when client is nil allow only certain messages to be handled
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if w.client == nil {
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switch msg.(type) {
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case *types.Connect, *types.Reconnect, *types.Disconnect, *types.Configure:
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default:
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return errClientNotReady
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}
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}
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// set connection timeout for calls to imap server
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if w.client != nil {
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w.client.Timeout = w.config.connection_timeout
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@ -251,124 +259,6 @@ func (w *IMAPWorker) handleImapUpdate(update client.Update) {
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}
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}
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func (w *IMAPWorker) connect() (*client.Client, error) {
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var (
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conn *net.TCPConn
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c *client.Client
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)
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addr, err := net.ResolveTCPAddr("tcp", w.config.addr)
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if err != nil {
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return nil, err
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}
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conn, err = net.DialTCP("tcp", nil, addr)
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if err != nil {
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return nil, err
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}
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if w.config.connection_timeout > 0 {
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end := time.Now().Add(w.config.connection_timeout)
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err = conn.SetDeadline(end)
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if err != nil {
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return nil, err
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}
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}
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if w.config.keepalive_period > 0 {
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err = w.setKeepaliveParameters(conn)
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if err != nil {
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return nil, err
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}
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}
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serverName, _, _ := net.SplitHostPort(w.config.addr)
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tlsConfig := &tls.Config{ServerName: serverName}
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switch w.config.scheme {
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case "imap":
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c, err = client.New(conn)
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if err != nil {
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return nil, err
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}
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if !w.config.insecure {
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if err = c.StartTLS(tlsConfig); err != nil {
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return nil, err
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}
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}
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case "imaps":
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tlsConn := tls.Client(conn, tlsConfig)
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c, err = client.New(tlsConn)
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if err != nil {
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return nil, err
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}
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default:
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return nil, fmt.Errorf("Unknown IMAP scheme %s", w.config.scheme)
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}
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c.ErrorLog = w.worker.Logger
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if w.config.user != nil {
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username := w.config.user.Username()
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password, hasPassword := w.config.user.Password()
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if !hasPassword {
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// TODO: ask password
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}
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if w.config.oauthBearer.Enabled {
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if err := w.config.oauthBearer.Authenticate(
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username, password, c); err != nil {
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return nil, err
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}
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} else if err := c.Login(username, password); err != nil {
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return nil, err
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}
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}
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c.SetDebug(w.worker.Logger.Writer())
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if _, err := c.Select(imap.InboxName, false); err != nil {
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return nil, err
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}
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return c, nil
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}
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// Set additional keepalive parameters.
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// Uses new interfaces introduced in Go1.11, which let us get connection's file
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// descriptor, without blocking, and therefore without uncontrolled spawning of
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// threads (not goroutines, actual threads).
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func (w *IMAPWorker) setKeepaliveParameters(conn *net.TCPConn) error {
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err := conn.SetKeepAlive(true)
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if err != nil {
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return err
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}
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// Idle time before sending a keepalive probe
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err = conn.SetKeepAlivePeriod(w.config.keepalive_period)
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if err != nil {
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return err
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}
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rawConn, e := conn.SyscallConn()
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if e != nil {
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return e
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}
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err = rawConn.Control(func(fdPtr uintptr) {
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fd := int(fdPtr)
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// Max number of probes before failure
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err := lib.SetTcpKeepaliveProbes(fd, w.config.keepalive_probes)
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if err != nil {
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w.worker.Logger.Printf(
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"cannot set tcp keepalive probes: %v\n", err)
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}
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// Wait time after an unsuccessful probe
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err = lib.SetTcpKeepaliveInterval(fd, w.config.keepalive_interval)
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if err != nil {
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w.worker.Logger.Printf(
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"cannot set tcp keepalive interval: %v\n", err)
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}
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})
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return err
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}
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func (w *IMAPWorker) Run() {
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for {
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select {
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