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// Copyright 2016-2018 Yubico AB
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//go:build windows
// +build windows
package main
import (
"fmt"
"sync"
"unsafe"
log "github.com/sirupsen/logrus"
)
// #cgo CFLAGS: -DUNICODE -D_UNICODE
// #cgo LDFLAGS: -lwinusb -lsetupapi -luuid
// #include "usb_windows.h"
import "C"
var device struct {
ctx C.PDEVICE_CONTEXT
mtx sync.Mutex
}
type C_DWORD C.DWORD
func (e C_DWORD) Error() string {
return fmt.Sprintf("Windows Error: 0x%x", uint(e))
}
const (
SUCCESS C_DWORD = C.ERROR_SUCCESS
ERROR_INVALID_STATE C_DWORD = C.ERROR_INVALID_STATE
ERROR_INVALID_HANDLE C_DWORD = C.ERROR_INVALID_HANDLE
ERROR_INVALID_PARAMETER C_DWORD = C.ERROR_INVALID_PARAMETER
ERROR_OUTOFMEMORY C_DWORD = C.ERROR_OUTOFMEMORY
ERROR_GEN_FAILURE C_DWORD = C.ERROR_GEN_FAILURE
ERROR_OBJECT_NOT_FOUND C_DWORD = C.ERROR_OBJECT_NOT_FOUND
ERROR_NOT_SUPPORTED C_DWORD = C.ERROR_NOT_SUPPORTED
ERROR_SHARING_VIOLATION C_DWORD = C.ERROR_SHARING_VIOLATION
ERROR_BAD_COMMAND C_DWORD = C.ERROR_BAD_COMMAND
)
func winusbError(err C.DWORD) error {
if err != C.ERROR_SUCCESS {
return C_DWORD(err)
}
return nil
}
func usbopen(cid string, serial string) (err error) {
if device.ctx != nil {
log.WithField("Correlation-ID", cid).Debug("usb context already open")
return nil
}
if serial != "" {
cSerial := C.CString(serial)
defer C.free(unsafe.Pointer(cSerial))
err = winusbError(C.usbOpen(0x1050, 0x0030, cSerial, &device.ctx))
} else {
err = winusbError(C.usbOpen(0x1050, 0x0030, nil, &device.ctx))
}
if device.ctx == nil {
err = fmt.Errorf("device not found")
}
return err
}
func usbclose(cid string) {
if device.ctx != nil {
C.usbClose(&device.ctx)
}
}
func usbreopen(cid string, why error, serial string) (err error) {
log.WithFields(log.Fields{
"Correlation-ID": cid,
"why": why,
}).Debug("reopening usb context")
usbclose(cid)
return usbopen(cid, serial)
}
func usbCheck(cid string, serial string) (err error) {
device.mtx.Lock()
defer device.mtx.Unlock()
if err = usbopen(cid, serial); err != nil {
return err
}
for {
if err = winusbError(C.usbCheck(device.ctx, 0x1050, 0x0030)); err != nil {
log.WithFields(log.Fields{
"Correlation-ID": cid,
"Error": err,
}).Debug("Couldn't check usb context")
if err = usbreopen(cid, err, serial); err != nil {
return err
}
continue
}
break
}
return nil
}
func usbwrite(buf []byte, cid string) (err error) {
var n C.ULONG
if err = winusbError(C.usbWrite(
device.ctx,
(*C.UCHAR)(unsafe.Pointer(&buf[0])),
C.ULONG(len(buf)),
&n)); err != nil {
goto out
}
out:
log.WithFields(log.Fields{
"Correlation-ID": cid,
"n": uint(n),
"err": err,
"len": len(buf),
"buf": buf,
}).Debug("usb endpoint write")
return err
}
func usbread(cid string) (buf []byte, err error) {
var n C.ULONG
buf = make([]byte, 8192)
if err = winusbError(C.usbRead(
device.ctx,
(*C.UCHAR)(unsafe.Pointer(&buf[0])),
C.ULONG(len(buf)),
&n)); err != nil {
buf = buf[:0]
goto out
}
buf = buf[:n]
out:
log.WithFields(log.Fields{
"Correlation-ID": cid,
"n": uint(n),
"err": err,
"len": len(buf),
"buf": buf,
}).Debug("usb endpoint read")
return buf, err
}
func usbProxy(req []byte, cid string, serial string) (resp []byte, err error) {
device.mtx.Lock()
defer device.mtx.Unlock()
if err = usbopen(cid, serial); err != nil {
return nil, err
}
for i := 0; i < 2; i++ {
if err = usbwrite(req, cid); err != nil {
if err2 := usbreopen(cid, err, serial); err2 != nil {
return nil, err2
}
continue
}
resp, err = usbread(cid)
break
}
return resp, err
}
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