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wintun: Simplify Read method()

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Signed-off-by: Simon Rozman <simon@rozman.si>
This commit is contained in:
Simon Rozman 2019-02-08 14:31:05 +01:00
parent 713477cfb1
commit f05f52637f
1 changed files with 49 additions and 49 deletions
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98
tun/tun_windows.go
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@ -203,64 +203,64 @@ func (tun *nativeTun) Read(buff []byte, offset int) (int, error) {
select {
case err := <-tun.errors:
return 0, err
default:
for {
if tun.rdNextPacket < tun.rdBuff.numPackets {
// Get packet from the queue.
tunPacket := &tun.rdBuff.packets[tun.rdNextPacket]
tun.rdNextPacket++
}
if packetSizeMax < tunPacket.size {
// Invalid packet size.
continue
}
for {
if tun.rdNextPacket < tun.rdBuff.numPackets {
// Get packet from the queue.
tunPacket := &tun.rdBuff.packets[tun.rdNextPacket]
tun.rdNextPacket++
// Copy data.
copy(buff[offset:], tunPacket.data[:tunPacket.size])
return int(tunPacket.size), nil
if packetSizeMax < tunPacket.size {
// Invalid packet size.
continue
}
if tun.signals[signalDataAvail] == 0 {
// Data pipe and interface data available event are not open (yet).
err := tun.openTUN()
if err != nil {
return 0, err
}
}
// Copy data.
copy(buff[offset:], tunPacket.data[:tunPacket.size])
return int(tunPacket.size), nil
}
// Wait for user close or interface data.
r, err := windows.WaitForMultipleObjects(tun.signals[:], false, windows.INFINITE)
if tun.signals[signalDataAvail] == 0 {
// Data pipe and interface data available event are not open (yet).
err := tun.openTUN()
if err != nil {
return 0, errors.New("Waiting for data failed: " + err.Error())
}
switch r {
case windows.WAIT_OBJECT_0 + signalClose, windows.WAIT_ABANDONED + signalClose:
return 0, errors.New("TUN closed")
case windows.WAIT_OBJECT_0 + signalDataAvail:
// Data is available.
case windows.WAIT_ABANDONED + signalDataAvail:
// TUN stopped. Reopen it.
tun.closeTUN()
continue
case windows.WAIT_TIMEOUT:
// Congratulations, we reached infinity. Let's do it again! :)
continue
default:
return 0, errors.New("unexpected result from WaitForMultipleObjects")
return 0, err
}
}
// Fill queue.
data := (*[exchangeBufferSize]byte)(unsafe.Pointer(&tun.rdBuff))
n, err := tun.tunFile.Read(data[:])
tun.rdNextPacket = 0
if n != exchangeBufferSize || err != nil {
// TUN interface stopped, returned incomplete data, etc.
// Retry.
tun.rdBuff.numPackets = 0
tun.closeTUN()
continue
}
// Wait for user close or interface data.
r, err := windows.WaitForMultipleObjects(tun.signals[:], false, windows.INFINITE)
if err != nil {
return 0, errors.New("Waiting for data failed: " + err.Error())
}
switch r {
case windows.WAIT_OBJECT_0 + signalClose, windows.WAIT_ABANDONED + signalClose:
return 0, errors.New("TUN closed")
case windows.WAIT_OBJECT_0 + signalDataAvail:
// Data is available.
case windows.WAIT_ABANDONED + signalDataAvail:
// TUN stopped. Reopen it.
tun.closeTUN()
continue
case windows.WAIT_TIMEOUT:
// Congratulations, we reached infinity. Let's do it again! :)
continue
default:
return 0, errors.New("unexpected result from WaitForMultipleObjects")
}
// Fill queue.
data := (*[exchangeBufferSize]byte)(unsafe.Pointer(&tun.rdBuff))
n, err := tun.tunFile.Read(data[:])
tun.rdNextPacket = 0
if n != exchangeBufferSize || err != nil {
// TUN interface stopped, returned incomplete data, etc.
// Retry.
tun.rdBuff.numPackets = 0
tun.closeTUN()
continue
}
}
}