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imap: fix panic when sending multiple connect cmds

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fixes the panic when the user sends multiple connect commands and is
already connected. The panic is caused by closing an already closed
channel. This happens when the idle re-init code is not executed, e.g.
when there's a return statement in the switch block.  A defer func()
before the switch block will prevent this. The existing behavior of only
creating a new idleStop channel when properly connected is preseverd.

Signed-off-by: Koni Marti <koni.marti@gmail.com>
This commit is contained in:
Koni Marti 2022-01-19 13:18:08 +01:00 committed by Robin Jarry
parent f81d8871c7
commit 022bf1a11f
1 changed files with 26 additions and 15 deletions
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41
worker/imap/worker.go
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@ -74,6 +74,14 @@ func (w *IMAPWorker) handleMessage(msg types.WorkerMessage) error {
w.worker.PostMessage(&types.Error{Error: err}, nil)
}
}
defer func() {
if w.client != nil && w.client.State() == imap.SelectedState {
w.idleStop = make(chan struct{})
go func() {
w.idleDone <- w.client.Idle(w.idleStop, &client.IdleOptions{0, 0})
}()
}
}()
var reterr error // will be returned at the end, needed to support idle
@ -83,7 +91,8 @@ func (w *IMAPWorker) handleMessage(msg types.WorkerMessage) error {
case *types.Configure:
u, err := url.Parse(msg.Config.Source)
if err != nil {
return err
reterr = err
break
}
w.config.scheme = u.Scheme
@ -123,44 +132,50 @@ func (w *IMAPWorker) handleMessage(msg types.WorkerMessage) error {
case "connection-timeout":
val, err := time.ParseDuration(value)
if err != nil || val < 0 {
return fmt.Errorf(
reterr = fmt.Errorf(
"invalid connection-timeout value %v: %v",
value, err)
break
}
w.config.connection_timeout = val
case "keepalive-period":
val, err := time.ParseDuration(value)
if err != nil || val < 0 {
return fmt.Errorf(
reterr = fmt.Errorf(
"invalid keepalive-period value %v: %v",
value, err)
break
}
w.config.keepalive_period = val
case "keepalive-probes":
val, err := strconv.Atoi(value)
if err != nil || val < 0 {
return fmt.Errorf(
reterr = fmt.Errorf(
"invalid keepalive-probes value %v: %v",
value, err)
break
}
w.config.keepalive_probes = val
case "keepalive-interval":
val, err := time.ParseDuration(value)
if err != nil || val < 0 {
return fmt.Errorf(
reterr = fmt.Errorf(
"invalid keepalive-interval value %v: %v",
value, err)
break
}
w.config.keepalive_interval = int(val.Seconds())
}
}
case *types.Connect:
if w.client != nil && w.client.State() == imap.SelectedState {
return fmt.Errorf("Already connected")
reterr = fmt.Errorf("Already connected")
break
}
c, err := w.connect()
if err != nil {
return err
reterr = err
break
}
c.Updates = w.updates
@ -168,10 +183,12 @@ func (w *IMAPWorker) handleMessage(msg types.WorkerMessage) error {
w.worker.PostMessage(&types.Done{types.RespondTo(msg)}, nil)
case *types.Disconnect:
if w.client == nil || w.client.State() != imap.SelectedState {
return fmt.Errorf("Not connected")
reterr = fmt.Errorf("Not connected")
break
}
if err := w.client.Logout(); err != nil {
return err
reterr = err
break
}
w.worker.PostMessage(&types.Done{types.RespondTo(msg)}, nil)
case *types.ListDirectories:
@ -208,12 +225,6 @@ func (w *IMAPWorker) handleMessage(msg types.WorkerMessage) error {
reterr = errUnsupported
}
if w.client != nil && w.client.State() == imap.SelectedState {
w.idleStop = make(chan struct{})
go func() {
w.idleDone <- w.client.Idle(w.idleStop, &client.IdleOptions{0, 0})
}()
}
return reterr
}