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Handle TAP-Win32 immediate reads correctly.

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The handling of TAP-Win32 virtual network device reads that complete
immediately (ReadFile() returns TRUE) is incorrect - instead of
starting a new read, tinc will continue listening for the overlapped
read completion event which will never fire. As a result, tinc stops
receiving packets on the interface.
This commit is contained in:
Etienne Dechamps 2014-07-19 18:11:42 +01:00
parent 1d10afd3d3
commit 5ae1ec8d80
1 changed files with 13 additions and 4 deletions
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17
src/mingw/device.c
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@ -49,11 +49,20 @@ static void device_issue_read() {
device_read_overlapped.Offset = 0; device_read_overlapped.Offset = 0;
device_read_overlapped.OffsetHigh = 0; device_read_overlapped.OffsetHigh = 0;
int status = ReadFile(device_handle, (void *)device_read_packet.data, MTU, NULL, &device_read_overlapped); int status;
for (;;) {
DWORD len;
status = ReadFile(device_handle, (void *)device_read_packet.data, MTU, &len, &device_read_overlapped);
if (!status) {
if (GetLastError() != ERROR_IO_PENDING)
logger(DEBUG_ALWAYS, LOG_ERR, "Error while reading from %s %s: %s", device_info,
device, strerror(errno));
break;
}
if(!status && GetLastError() != ERROR_IO_PENDING) { device_read_packet.len = len;
logger(DEBUG_ALWAYS, LOG_ERR, "Error while reading from %s %s: %s", device_info, device_read_packet.priority = 0;
device, strerror(errno)); route(myself, &device_read_packet);
} }
} }