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Code Issues Releases Wiki Activity

winpipe: move syscalls into x/sys

Browse Source 
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
This commit is contained in:
Jason A. Donenfeld 2021-03-03 12:26:59 +01:00
parent 4885e7c954
commit 82f3e9e2af
7 changed files with 1178 additions and 837 deletions
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4
ipc/uapi_windows.go
View File

@ -62,10 +62,10 @@ func init() {
}
func UAPIListen(name string) (net.Listener, error) {
config := winpipe.PipeConfig{
config := winpipe.ListenConfig{
SecurityDescriptor: UAPISecurityDescriptor,
}
listener, err := winpipe.ListenPipe(`\\.\pipe\ProtectedPrefix\Administrators\WireGuard\`+name, &config)
listener, err := winpipe.Listen(`\\.\pipe\ProtectedPrefix\Administrators\WireGuard\`+name, &config)
if err != nil {
return nil, err
}

121
ipc/winpipe/file.go
View File

@ -5,54 +5,21 @@
* Copyright (C) 2005 Microsoft
* Copyright (C) 2017-2021 WireGuard LLC. All Rights Reserved.
*/
package winpipe
import (
"errors"
"io"
"os"
"runtime"
"sync"
"sync/atomic"
"time"
"unsafe"
"golang.org/x/sys/windows"
)
//sys cancelIoEx(file windows.Handle, o *windows.Overlapped) (err error) = CancelIoEx
//sys createIoCompletionPort(file windows.Handle, port windows.Handle, key uintptr, threadCount uint32) (newport windows.Handle, err error) = CreateIoCompletionPort
//sys getQueuedCompletionStatus(port windows.Handle, bytes *uint32, key *uintptr, o **ioOperation, timeout uint32) (err error) = GetQueuedCompletionStatus
//sys setFileCompletionNotificationModes(h windows.Handle, flags uint8) (err error) = SetFileCompletionNotificationModes
//sys wsaGetOverlappedResult(h windows.Handle, o *windows.Overlapped, bytes *uint32, wait bool, flags *uint32) (err error) = ws2_32.WSAGetOverlappedResult
type atomicBool int32
func (b *atomicBool) isSet() bool { return atomic.LoadInt32((*int32)(b)) != 0 }
func (b *atomicBool) setFalse() { atomic.StoreInt32((*int32)(b), 0) }
func (b *atomicBool) setTrue() { atomic.StoreInt32((*int32)(b), 1) }
func (b *atomicBool) swap(new bool) bool {
var newInt int32
if new {
newInt = 1
}
return atomic.SwapInt32((*int32)(b), newInt) == 1
}
const (
cFILE_SKIP_COMPLETION_PORT_ON_SUCCESS = 1
cFILE_SKIP_SET_EVENT_ON_HANDLE = 2
)
var (
ErrFileClosed = errors.New("file has already been closed")
ErrTimeout = &timeoutError{}
)
type timeoutError struct{}
func (e *timeoutError) Error() string { return "i/o timeout" }
func (e *timeoutError) Timeout() bool { return true }
func (e *timeoutError) Temporary() bool { return true }
type timeoutChan chan struct{}
var ioInitOnce sync.Once
@ -71,7 +38,7 @@ type ioOperation struct {
}
func initIo() {
h, err := createIoCompletionPort(windows.InvalidHandle, 0, 0, 0xffffffff)
h, err := windows.CreateIoCompletionPort(windows.InvalidHandle, 0, 0, 0)
if err != nil {
panic(err)
}
@ -79,13 +46,13 @@ func initIo() {
go ioCompletionProcessor(h)
}
// win32File implements Reader, Writer, and Closer on a Win32 handle without blocking in a syscall.
// file implements Reader, Writer, and Closer on a Win32 handle without blocking in a syscall.
// It takes ownership of this handle and will close it if it is garbage collected.
type win32File struct {
type file struct {
handle windows.Handle
wg sync.WaitGroup
wgLock sync.RWMutex
closing atomicBool
closing uint32 // used as atomic boolean
socket bool
readDeadline deadlineHandler
writeDeadline deadlineHandler
@ -96,18 +63,18 @@ type deadlineHandler struct {
channel timeoutChan
channelLock sync.RWMutex
timer *time.Timer
timedout atomicBool
timedout uint32 // used as atomic boolean
}
// makeWin32File makes a new win32File from an existing file handle
func makeWin32File(h windows.Handle) (*win32File, error) {
f := &win32File{handle: h}
// makeFile makes a new file from an existing file handle
func makeFile(h windows.Handle) (*file, error) {
f := &file{handle: h}
ioInitOnce.Do(initIo)
_, err := createIoCompletionPort(h, ioCompletionPort, 0, 0xffffffff)
_, err := windows.CreateIoCompletionPort(h, ioCompletionPort, 0, 0)
if err != nil {
return nil, err
}
err = setFileCompletionNotificationModes(h, cFILE_SKIP_COMPLETION_PORT_ON_SUCCESS|cFILE_SKIP_SET_EVENT_ON_HANDLE)
err = windows.SetFileCompletionNotificationModes(h, windows.FILE_SKIP_COMPLETION_PORT_ON_SUCCESS|windows.FILE_SKIP_SET_EVENT_ON_HANDLE)
if err != nil {
return nil, err
}
@ -116,18 +83,14 @@ func makeWin32File(h windows.Handle) (*win32File, error) {
return f, nil
}
func MakeOpenFile(h windows.Handle) (io.ReadWriteCloser, error) {
return makeWin32File(h)
}
// closeHandle closes the resources associated with a Win32 handle
func (f *win32File) closeHandle() {
func (f *file) closeHandle() {
f.wgLock.Lock()
// Atomically set that we are closing, releasing the resources only once.
if !f.closing.swap(true) {
if atomic.SwapUint32(&f.closing, 1) == 0 {
f.wgLock.Unlock()
// cancel all IO and wait for it to complete
cancelIoEx(f.handle, nil)
windows.CancelIoEx(f.handle, nil)
f.wg.Wait()
// at this point, no new IO can start
windows.Close(f.handle)
@ -137,19 +100,19 @@ func (f *win32File) closeHandle() {
}
}
// Close closes a win32File.
func (f *win32File) Close() error {
// Close closes a file.
func (f *file) Close() error {
f.closeHandle()
return nil
}
// prepareIo prepares for a new IO operation.
// The caller must call f.wg.Done() when the IO is finished, prior to Close() returning.
func (f *win32File) prepareIo() (*ioOperation, error) {
func (f *file) prepareIo() (*ioOperation, error) {
f.wgLock.RLock()
if f.closing.isSet() {
if atomic.LoadUint32(&f.closing) == 1 {
f.wgLock.RUnlock()
return nil, ErrFileClosed
return nil, os.ErrClosed
}
f.wg.Add(1)
f.wgLock.RUnlock()
@ -164,7 +127,7 @@ func ioCompletionProcessor(h windows.Handle) {
var bytes uint32
var key uintptr
var op *ioOperation
err := getQueuedCompletionStatus(h, &bytes, &key, &op, windows.INFINITE)
err := windows.GetQueuedCompletionStatus(h, &bytes, &key, (**windows.Overlapped)(unsafe.Pointer(&op)), windows.INFINITE)
if op == nil {
panic(err)
}
@ -174,13 +137,13 @@ func ioCompletionProcessor(h windows.Handle) {
// asyncIo processes the return value from ReadFile or WriteFile, blocking until
// the operation has actually completed.
func (f *win32File) asyncIo(c *ioOperation, d *deadlineHandler, bytes uint32, err error) (int, error) {
func (f *file) asyncIo(c *ioOperation, d *deadlineHandler, bytes uint32, err error) (int, error) {
if err != windows.ERROR_IO_PENDING {
return int(bytes), err
}
if f.closing.isSet() {
cancelIoEx(f.handle, &c.o)
if atomic.LoadUint32(&f.closing) == 1 {
windows.CancelIoEx(f.handle, &c.o)
}
var timeout timeoutChan
@ -195,20 +158,20 @@ func (f *win32File) asyncIo(c *ioOperation, d *deadlineHandler, bytes uint32, er
case r = <-c.ch:
err = r.err
if err == windows.ERROR_OPERATION_ABORTED {
if f.closing.isSet() {
err = ErrFileClosed
if atomic.LoadUint32(&f.closing) == 1 {
err = os.ErrClosed
}
} else if err != nil && f.socket {
// err is from Win32. Query the overlapped structure to get the winsock error.
var bytes, flags uint32
err = wsaGetOverlappedResult(f.handle, &c.o, &bytes, false, &flags)
err = windows.WSAGetOverlappedResult(f.handle, &c.o, &bytes, false, &flags)
}
case <-timeout:
cancelIoEx(f.handle, &c.o)
windows.CancelIoEx(f.handle, &c.o)
r = <-c.ch
err = r.err
if err == windows.ERROR_OPERATION_ABORTED {
err = ErrTimeout
err = os.ErrDeadlineExceeded
}
}
@ -220,15 +183,15 @@ func (f *win32File) asyncIo(c *ioOperation, d *deadlineHandler, bytes uint32, er
}
// Read reads from a file handle.
func (f *win32File) Read(b []byte) (int, error) {
func (f *file) Read(b []byte) (int, error) {
c, err := f.prepareIo()
if err != nil {
return 0, err
}
defer f.wg.Done()
if f.readDeadline.timedout.isSet() {
return 0, ErrTimeout
if atomic.LoadUint32(&f.readDeadline.timedout) == 1 {
return 0, os.ErrDeadlineExceeded
}
var bytes uint32
@ -247,15 +210,15 @@ func (f *win32File) Read(b []byte) (int, error) {
}
// Write writes to a file handle.
func (f *win32File) Write(b []byte) (int, error) {
func (f *file) Write(b []byte) (int, error) {
c, err := f.prepareIo()
if err != nil {
return 0, err
}
defer f.wg.Done()
if f.writeDeadline.timedout.isSet() {
return 0, ErrTimeout
if atomic.LoadUint32(&f.writeDeadline.timedout) == 1 {
return 0, os.ErrDeadlineExceeded
}
var bytes uint32
@ -265,19 +228,19 @@ func (f *win32File) Write(b []byte) (int, error) {
return n, err
}
func (f *win32File) SetReadDeadline(deadline time.Time) error {
func (f *file) SetReadDeadline(deadline time.Time) error {
return f.readDeadline.set(deadline)
}
func (f *win32File) SetWriteDeadline(deadline time.Time) error {
func (f *file) SetWriteDeadline(deadline time.Time) error {
return f.writeDeadline.set(deadline)
}
func (f *win32File) Flush() error {
func (f *file) Flush() error {
return windows.FlushFileBuffers(f.handle)
}
func (f *win32File) Fd() uintptr {
func (f *file) Fd() uintptr {
return uintptr(f.handle)
}
@ -291,7 +254,7 @@ func (d *deadlineHandler) set(deadline time.Time) error {
}
d.timer = nil
}
d.timedout.setFalse()
atomic.StoreUint32(&d.timedout, 0)
select {
case <-d.channel:
@ -306,7 +269,7 @@ func (d *deadlineHandler) set(deadline time.Time) error {
}
timeoutIO := func() {
d.timedout.setTrue()
atomic.StoreUint32(&d.timedout, 1)
close(d.channel)
}

9
ipc/winpipe/mksyscall.go
View File

@ -1,9 +0,0 @@
/* SPDX-License-Identifier: MIT
*
* Copyright (C) 2005 Microsoft
* Copyright (C) 2017-2021 WireGuard LLC. All Rights Reserved.
*/
package winpipe
//go:generate go run golang.org/x/sys/windows/mkwinsyscall -output zsyscall_windows.go pipe.go file.go

509
ipc/winpipe/pipe.go
View File

@ -1,509 +0,0 @@
// +build windows
/* SPDX-License-Identifier: MIT
*
* Copyright (C) 2005 Microsoft
* Copyright (C) 2017-2021 WireGuard LLC. All Rights Reserved.
*/
package winpipe
import (
"context"
"errors"
"fmt"
"io"
"net"
"os"
"runtime"
"time"
"unsafe"
"golang.org/x/sys/windows"
)
//sys connectNamedPipe(pipe windows.Handle, o *windows.Overlapped) (err error) = ConnectNamedPipe
//sys createNamedPipe(name string, flags uint32, pipeMode uint32, maxInstances uint32, outSize uint32, inSize uint32, defaultTimeout uint32, sa *windows.SecurityAttributes) (handle windows.Handle, err error) [failretval==windows.InvalidHandle] = CreateNamedPipeW
//sys createFile(name string, access uint32, mode uint32, sa *windows.SecurityAttributes, createmode uint32, attrs uint32, templatefile windows.Handle) (handle windows.Handle, err error) [failretval==windows.InvalidHandle] = CreateFileW
//sys getNamedPipeInfo(pipe windows.Handle, flags *uint32, outSize *uint32, inSize *uint32, maxInstances *uint32) (err error) = GetNamedPipeInfo
//sys getNamedPipeHandleState(pipe windows.Handle, state *uint32, curInstances *uint32, maxCollectionCount *uint32, collectDataTimeout *uint32, userName *uint16, maxUserNameSize uint32) (err error) = GetNamedPipeHandleStateW
//sys localAlloc(uFlags uint32, length uint32) (ptr uintptr) = LocalAlloc
//sys ntCreateNamedPipeFile(pipe *windows.Handle, access uint32, oa *objectAttributes, iosb *ioStatusBlock, share uint32, disposition uint32, options uint32, typ uint32, readMode uint32, completionMode uint32, maxInstances uint32, inboundQuota uint32, outputQuota uint32, timeout *int64) (status ntstatus) = ntdll.NtCreateNamedPipeFile
//sys rtlNtStatusToDosError(status ntstatus) (winerr error) = ntdll.RtlNtStatusToDosErrorNoTeb
//sys rtlDosPathNameToNtPathName(name *uint16, ntName *unicodeString, filePart uintptr, reserved uintptr) (status ntstatus) = ntdll.RtlDosPathNameToNtPathName_U
//sys rtlDefaultNpAcl(dacl *uintptr) (status ntstatus) = ntdll.RtlDefaultNpAcl
type ioStatusBlock struct {
Status, Information uintptr
}
type objectAttributes struct {
Length uintptr
RootDirectory uintptr
ObjectName *unicodeString
Attributes uintptr
SecurityDescriptor *windows.SECURITY_DESCRIPTOR
SecurityQoS uintptr
}
type unicodeString struct {
Length uint16
MaximumLength uint16
Buffer uintptr
}
type ntstatus int32
func (status ntstatus) Err() error {
if status >= 0 {
return nil
}
return rtlNtStatusToDosError(status)
}
const (
cSECURITY_SQOS_PRESENT = 0x100000
cSECURITY_ANONYMOUS = 0
cPIPE_TYPE_MESSAGE = 4
cPIPE_READMODE_MESSAGE = 2
cFILE_OPEN = 1
cFILE_CREATE = 2
cFILE_PIPE_MESSAGE_TYPE = 1
cFILE_PIPE_REJECT_REMOTE_CLIENTS = 2
)
var (
// ErrPipeListenerClosed is returned for pipe operations on listeners that have been closed.
// This error should match net.errClosing since docker takes a dependency on its text.
ErrPipeListenerClosed = errors.New("use of closed network connection")
errPipeWriteClosed = errors.New("pipe has been closed for write")
)
type win32Pipe struct {
*win32File
path string
}
type win32MessageBytePipe struct {
win32Pipe
writeClosed bool
readEOF bool
}
type pipeAddress string
func (f *win32Pipe) LocalAddr() net.Addr {
return pipeAddress(f.path)
}
func (f *win32Pipe) RemoteAddr() net.Addr {
return pipeAddress(f.path)
}
func (f *win32Pipe) SetDeadline(t time.Time) error {
f.SetReadDeadline(t)
f.SetWriteDeadline(t)
return nil
}
// CloseWrite closes the write side of a message pipe in byte mode.
func (f *win32MessageBytePipe) CloseWrite() error {
if f.writeClosed {
return errPipeWriteClosed
}
err := f.win32File.Flush()
if err != nil {
return err
}
_, err = f.win32File.Write(nil)
if err != nil {
return err
}
f.writeClosed = true
return nil
}
// Write writes bytes to a message pipe in byte mode. Zero-byte writes are ignored, since
// they are used to implement CloseWrite().
func (f *win32MessageBytePipe) Write(b []byte) (int, error) {
if f.writeClosed {
return 0, errPipeWriteClosed
}
if len(b) == 0 {
return 0, nil
}
return f.win32File.Write(b)
}
// Read reads bytes from a message pipe in byte mode. A read of a zero-byte message on a message
// mode pipe will return io.EOF, as will all subsequent reads.
func (f *win32MessageBytePipe) Read(b []byte) (int, error) {
if f.readEOF {
return 0, io.EOF
}
n, err := f.win32File.Read(b)
if err == io.EOF {
// If this was the result of a zero-byte read, then
// it is possible that the read was due to a zero-size
// message. Since we are simulating CloseWrite with a
// zero-byte message, ensure that all future Read() calls
// also return EOF.
f.readEOF = true
} else if err == windows.ERROR_MORE_DATA {
// ERROR_MORE_DATA indicates that the pipe's read mode is message mode
// and the message still has more bytes. Treat this as a success, since
// this package presents all named pipes as byte streams.
err = nil
}
return n, err
}
func (s pipeAddress) Network() string {
return "pipe"
}
func (s pipeAddress) String() string {
return string(s)
}
// tryDialPipe attempts to dial the pipe at `path` until `ctx` cancellation or timeout.
func tryDialPipe(ctx context.Context, path *string) (windows.Handle, error) {
for {
select {
case <-ctx.Done():
return windows.Handle(0), ctx.Err()
default:
h, err := createFile(*path, windows.GENERIC_READ|windows.GENERIC_WRITE, 0, nil, windows.OPEN_EXISTING, windows.FILE_FLAG_OVERLAPPED|cSECURITY_SQOS_PRESENT|cSECURITY_ANONYMOUS, 0)
if err == nil {
return h, nil
}
if err != windows.ERROR_PIPE_BUSY {
return h, &os.PathError{Err: err, Op: "open", Path: *path}
}
// Wait 10 msec and try again. This is a rather simplistic
// view, as we always try each 10 milliseconds.
time.Sleep(time.Millisecond * 10)
}
}
}
// DialPipe connects to a named pipe by path, timing out if the connection
// takes longer than the specified duration. If timeout is nil, then we use
// a default timeout of 2 seconds. (We do not use WaitNamedPipe.)
func DialPipe(path string, timeout *time.Duration, expectedOwner *windows.SID) (net.Conn, error) {
var absTimeout time.Time
if timeout != nil {
absTimeout = time.Now().Add(*timeout)
} else {
absTimeout = time.Now().Add(time.Second * 2)
}
ctx, _ := context.WithDeadline(context.Background(), absTimeout)
conn, err := DialPipeContext(ctx, path, expectedOwner)
if err == context.DeadlineExceeded {
return nil, ErrTimeout
}
return conn, err
}
// DialPipeContext attempts to connect to a named pipe by `path` until `ctx`
// cancellation or timeout.
func DialPipeContext(ctx context.Context, path string, expectedOwner *windows.SID) (net.Conn, error) {
var err error
var h windows.Handle
h, err = tryDialPipe(ctx, &path)
if err != nil {
return nil, err
}
if expectedOwner != nil {
sd, err := windows.GetSecurityInfo(h, windows.SE_FILE_OBJECT, windows.OWNER_SECURITY_INFORMATION)
if err != nil {
windows.Close(h)
return nil, err
}
realOwner, _, err := sd.Owner()
if err != nil {
windows.Close(h)
return nil, err
}
if !realOwner.Equals(expectedOwner) {
windows.Close(h)
return nil, windows.ERROR_ACCESS_DENIED
}
}
var flags uint32
err = getNamedPipeInfo(h, &flags, nil, nil, nil)
if err != nil {
windows.Close(h)
return nil, err
}
f, err := makeWin32File(h)
if err != nil {
windows.Close(h)
return nil, err
}
// If the pipe is in message mode, return a message byte pipe, which
// supports CloseWrite().
if flags&cPIPE_TYPE_MESSAGE != 0 {
return &win32MessageBytePipe{
win32Pipe: win32Pipe{win32File: f, path: path},
}, nil
}
return &win32Pipe{win32File: f, path: path}, nil
}
type acceptResponse struct {
f *win32File
err error
}
type win32PipeListener struct {
firstHandle windows.Handle
path string
config PipeConfig
acceptCh chan (chan acceptResponse)
closeCh chan int
doneCh chan int
}
func makeServerPipeHandle(path string, sd *windows.SECURITY_DESCRIPTOR, c *PipeConfig, first bool) (windows.Handle, error) {
path16, err := windows.UTF16FromString(path)
if err != nil {
return 0, &os.PathError{Op: "open", Path: path, Err: err}
}
var oa objectAttributes
oa.Length = unsafe.Sizeof(oa)
var ntPath unicodeString
if err := rtlDosPathNameToNtPathName(&path16[0], &ntPath, 0, 0).Err(); err != nil {
return 0, &os.PathError{Op: "open", Path: path, Err: err}
}
defer windows.LocalFree(windows.Handle(ntPath.Buffer))
oa.ObjectName = &ntPath
// The security descriptor is only needed for the first pipe.
if first {
if sd != nil {
oa.SecurityDescriptor = sd
} else {
// Construct the default named pipe security descriptor.
var dacl uintptr
if err := rtlDefaultNpAcl(&dacl).Err(); err != nil {
return 0, fmt.Errorf("getting default named pipe ACL: %s", err)
}
defer windows.LocalFree(windows.Handle(dacl))
sd, err := windows.NewSecurityDescriptor()
if err != nil {
return 0, fmt.Errorf("creating new security descriptor: %s", err)
}
if err = sd.SetDACL((*windows.ACL)(unsafe.Pointer(dacl)), true, false); err != nil {
return 0, fmt.Errorf("assigning dacl: %s", err)
}
sd, err = sd.ToSelfRelative()
if err != nil {
return 0, fmt.Errorf("converting to self-relative: %s", err)
}
oa.SecurityDescriptor = sd
}
}
typ := uint32(cFILE_PIPE_REJECT_REMOTE_CLIENTS)
if c.MessageMode {
typ |= cFILE_PIPE_MESSAGE_TYPE
}
disposition := uint32(cFILE_OPEN)
access := uint32(windows.GENERIC_READ | windows.GENERIC_WRITE | windows.SYNCHRONIZE)
if first {
disposition = cFILE_CREATE
// By not asking for read or write access, the named pipe file system
// will put this pipe into an initially disconnected state, blocking
// client connections until the next call with first == false.
access = windows.SYNCHRONIZE
}
timeout := int64(-50 * 10000) // 50ms
var (
h windows.Handle
iosb ioStatusBlock
)
err = ntCreateNamedPipeFile(&h, access, &oa, &iosb, windows.FILE_SHARE_READ|windows.FILE_SHARE_WRITE, disposition, 0, typ, 0, 0, 0xffffffff, uint32(c.InputBufferSize), uint32(c.OutputBufferSize), &timeout).Err()
if err != nil {
return 0, &os.PathError{Op: "open", Path: path, Err: err}
}
runtime.KeepAlive(ntPath)
return h, nil
}
func (l *win32PipeListener) makeServerPipe() (*win32File, error) {
h, err := makeServerPipeHandle(l.path, nil, &l.config, false)
if err != nil {
return nil, err
}
f, err := makeWin32File(h)
if err != nil {
windows.Close(h)
return nil, err
}
return f, nil
}
func (l *win32PipeListener) makeConnectedServerPipe() (*win32File, error) {
p, err := l.makeServerPipe()
if err != nil {
return nil, err
}
// Wait for the client to connect.
ch := make(chan error)
go func(p *win32File) {
ch <- connectPipe(p)
}(p)
select {
case err = <-ch:
if err != nil {
p.Close()
p = nil
}
case <-l.closeCh:
// Abort the connect request by closing the handle.
p.Close()
p = nil
err = <-ch
if err == nil || err == ErrFileClosed {
err = ErrPipeListenerClosed
}
}
return p, err
}
func (l *win32PipeListener) listenerRoutine() {
closed := false
for !closed {
select {
case <-l.closeCh:
closed = true
case responseCh := <-l.acceptCh:
var (
p *win32File
err error
)
for {
p, err = l.makeConnectedServerPipe()
// If the connection was immediately closed by the client, try
// again.
if err != windows.ERROR_NO_DATA {
break
}
}
responseCh <- acceptResponse{p, err}
closed = err == ErrPipeListenerClosed
}
}
windows.Close(l.firstHandle)
l.firstHandle = 0
// Notify Close() and Accept() callers that the handle has been closed.
close(l.doneCh)
}
// PipeConfig contain configuration for the pipe listener.
type PipeConfig struct {
// SecurityDescriptor contains a Windows security descriptor.
SecurityDescriptor *windows.SECURITY_DESCRIPTOR
// MessageMode determines whether the pipe is in byte or message mode. In either
// case the pipe is read in byte mode by default. The only practical difference in
// this implementation is that CloseWrite() is only supported for message mode pipes;
// CloseWrite() is implemented as a zero-byte write, but zero-byte writes are only
// transferred to the reader (and returned as io.EOF in this implementation)
// when the pipe is in message mode.
MessageMode bool
// InputBufferSize specifies the size the input buffer, in bytes.
InputBufferSize int32
// OutputBufferSize specifies the size the input buffer, in bytes.
OutputBufferSize int32
}
// ListenPipe creates a listener on a Windows named pipe path, e.g. \\.\pipe\mypipe.
// The pipe must not already exist.
func ListenPipe(path string, c *PipeConfig) (net.Listener, error) {
if c == nil {
c = &PipeConfig{}
}
h, err := makeServerPipeHandle(path, c.SecurityDescriptor, c, true)
if err != nil {
return nil, err
}
l := &win32PipeListener{
firstHandle: h,
path: path,
config: *c,
acceptCh: make(chan (chan acceptResponse)),
closeCh: make(chan int),
doneCh: make(chan int),
}
go l.listenerRoutine()
return l, nil
}
func connectPipe(p *win32File) error {
c, err := p.prepareIo()
if err != nil {
return err
}
defer p.wg.Done()
err = connectNamedPipe(p.handle, &c.o)
_, err = p.asyncIo(c, nil, 0, err)
if err != nil && err != windows.ERROR_PIPE_CONNECTED {
return err
}
return nil
}
func (l *win32PipeListener) Accept() (net.Conn, error) {
ch := make(chan acceptResponse)
select {
case l.acceptCh <- ch:
response := <-ch
err := response.err
if err != nil {
return nil, err
}
if l.config.MessageMode {
return &win32MessageBytePipe{
win32Pipe: win32Pipe{win32File: response.f, path: l.path},
}, nil
}
return &win32Pipe{win32File: response.f, path: l.path}, nil
case <-l.doneCh:
return nil, ErrPipeListenerClosed
}
}
func (l *win32PipeListener) Close() error {
select {
case l.closeCh <- 1:
<-l.doneCh
case <-l.doneCh:
}
return nil
}
func (l *win32PipeListener) Addr() net.Addr {
return pipeAddress(l.path)
}

474
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// +build windows
/* SPDX-License-Identifier: MIT
*
* Copyright (C) 2005 Microsoft
* Copyright (C) 2017-2021 WireGuard LLC. All Rights Reserved.
*/
// Package winpipe implements a net.Conn and net.Listener around Windows named pipes.
package winpipe
import (
"context"
"io"
"net"
"os"
"runtime"
"time"
"unsafe"
"golang.org/x/sys/windows"
)
type pipe struct {
*file
path string
}
type messageBytePipe struct {
pipe
writeClosed bool
readEOF bool
}
type pipeAddress string
func (f *pipe) LocalAddr() net.Addr {
return pipeAddress(f.path)
}
func (f *pipe) RemoteAddr() net.Addr {
return pipeAddress(f.path)
}
func (f *pipe) SetDeadline(t time.Time) error {
f.SetReadDeadline(t)
f.SetWriteDeadline(t)
return nil
}
// CloseWrite closes the write side of a message pipe in byte mode.
func (f *messageBytePipe) CloseWrite() error {
if f.writeClosed {
return io.ErrClosedPipe
}
err := f.file.Flush()
if err != nil {
return err
}
_, err = f.file.Write(nil)
if err != nil {
return err
}
f.writeClosed = true
return nil
}
// Write writes bytes to a message pipe in byte mode. Zero-byte writes are ignored, since
// they are used to implement CloseWrite.
func (f *messageBytePipe) Write(b []byte) (int, error) {
if f.writeClosed {
return 0, io.ErrClosedPipe
}
if len(b) == 0 {
return 0, nil
}
return f.file.Write(b)
}
// Read reads bytes from a message pipe in byte mode. A read of a zero-byte message on a message
// mode pipe will return io.EOF, as will all subsequent reads.
func (f *messageBytePipe) Read(b []byte) (int, error) {
if f.readEOF {
return 0, io.EOF
}
n, err := f.file.Read(b)
if err == io.EOF {
// If this was the result of a zero-byte read, then
// it is possible that the read was due to a zero-size
// message. Since we are simulating CloseWrite with a
// zero-byte message, ensure that all future Read calls
// also return EOF.
f.readEOF = true
} else if err == windows.ERROR_MORE_DATA {
// ERROR_MORE_DATA indicates that the pipe's read mode is message mode
// and the message still has more bytes. Treat this as a success, since
// this package presents all named pipes as byte streams.
err = nil
}
return n, err
}
func (f *pipe) Handle() windows.Handle {
return f.handle
}
func (s pipeAddress) Network() string {
return "pipe"
}
func (s pipeAddress) String() string {
return string(s)
}
// tryDialPipe attempts to dial the specified pipe until cancellation or timeout.
func tryDialPipe(ctx context.Context, path *string) (windows.Handle, error) {
for {
select {
case <-ctx.Done():
return 0, ctx.Err()
default:
path16, err := windows.UTF16PtrFromString(*path)
if err != nil {
return 0, err
}
h, err := windows.CreateFile(path16, windows.GENERIC_READ|windows.GENERIC_WRITE, 0, nil, windows.OPEN_EXISTING, windows.FILE_FLAG_OVERLAPPED|windows.SECURITY_SQOS_PRESENT|windows.SECURITY_ANONYMOUS, 0)
if err == nil {
return h, nil
}
if err != windows.ERROR_PIPE_BUSY {
return h, &os.PathError{Err: err, Op: "open", Path: *path}
}
// Wait 10 msec and try again. This is a rather simplistic
// view, as we always try each 10 milliseconds.
time.Sleep(10 * time.Millisecond)
}
}
}
// DialConfig exposes various options for use in Dial and DialContext.
type DialConfig struct {
ExpectedOwner *windows.SID // If non-nil, the pipe is verified to be owned by this SID.
}
// Dial connects to the specified named pipe by path, timing out if the connection
// takes longer than the specified duration. If timeout is nil, then we use
// a default timeout of 2 seconds.
func Dial(path string, timeout *time.Duration, config *DialConfig) (net.Conn, error) {
var absTimeout time.Time
if timeout != nil {
absTimeout = time.Now().Add(*timeout)
} else {
absTimeout = time.Now().Add(2 * time.Second)
}
ctx, _ := context.WithDeadline(context.Background(), absTimeout)
conn, err := DialContext(ctx, path, config)
if err == context.DeadlineExceeded {
return nil, os.ErrDeadlineExceeded
}
return conn, err
}
// DialContext attempts to connect to the specified named pipe by path
// cancellation or timeout.
func DialContext(ctx context.Context, path string, config *DialConfig) (net.Conn, error) {
if config == nil {
config = &DialConfig{}
}
var err error
var h windows.Handle
h, err = tryDialPipe(ctx, &path)
if err != nil {
return nil, err
}
if config.ExpectedOwner != nil {
sd, err := windows.GetSecurityInfo(h, windows.SE_FILE_OBJECT, windows.OWNER_SECURITY_INFORMATION)
if err != nil {
windows.Close(h)
return nil, err
}
realOwner, _, err := sd.Owner()
if err != nil {
windows.Close(h)
return nil, err
}
if !realOwner.Equals(config.ExpectedOwner) {
windows.Close(h)
return nil, windows.ERROR_ACCESS_DENIED
}
}
var flags uint32
err = windows.GetNamedPipeInfo(h, &flags, nil, nil, nil)
if err != nil {
windows.Close(h)
return nil, err
}
f, err := makeFile(h)
if err != nil {
windows.Close(h)
return nil, err
}
// If the pipe is in message mode, return a message byte pipe, which
// supports CloseWrite.
if flags&windows.PIPE_TYPE_MESSAGE != 0 {
return &messageBytePipe{
pipe: pipe{file: f, path: path},
}, nil
}
return &pipe{file: f, path: path}, nil
}
type acceptResponse struct {
f *file
err error
}
type pipeListener struct {
firstHandle windows.Handle
path string
config ListenConfig
acceptCh chan (chan acceptResponse)
closeCh chan int
doneCh chan int
}
func makeServerPipeHandle(path string, sd *windows.SECURITY_DESCRIPTOR, c *ListenConfig, first bool) (windows.Handle, error) {
path16, err := windows.UTF16PtrFromString(path)
if err != nil {
return 0, &os.PathError{Op: "open", Path: path, Err: err}
}
var oa windows.OBJECT_ATTRIBUTES
oa.Length = uint32(unsafe.Sizeof(oa))
var ntPath windows.NTUnicodeString
if err := windows.RtlDosPathNameToNtPathName(path16, &ntPath, nil, nil); err != nil {
if ntstatus, ok := err.(windows.NTStatus); ok {
err = ntstatus.Errno()
}
return 0, &os.PathError{Op: "open", Path: path, Err: err}
}
defer windows.LocalFree(windows.Handle(unsafe.Pointer(ntPath.Buffer)))
oa.ObjectName = &ntPath
// The security descriptor is only needed for the first pipe.
if first {
if sd != nil {
oa.SecurityDescriptor = sd
} else {
// Construct the default named pipe security descriptor.
var acl *windows.ACL
if err := windows.RtlDefaultNpAcl(&acl); err != nil {
return 0, err
}
defer windows.LocalFree(windows.Handle(unsafe.Pointer(acl)))
sd, err := windows.NewSecurityDescriptor()
if err != nil {
return 0, err
}
if err = sd.SetDACL(acl, true, false); err != nil {
return 0, err
}
oa.SecurityDescriptor = sd
}
}
typ := uint32(windows.FILE_PIPE_REJECT_REMOTE_CLIENTS)
if c.MessageMode {
typ |= windows.FILE_PIPE_MESSAGE_TYPE
}
disposition := uint32(windows.FILE_OPEN)
access := uint32(windows.GENERIC_READ | windows.GENERIC_WRITE | windows.SYNCHRONIZE)
if first {
disposition = windows.FILE_CREATE
// By not asking for read or write access, the named pipe file system
// will put this pipe into an initially disconnected state, blocking
// client connections until the next call with first == false.
access = windows.SYNCHRONIZE
}
timeout := int64(-50 * 10000) // 50ms
var (
h windows.Handle
iosb windows.IO_STATUS_BLOCK
)
err = windows.NtCreateNamedPipeFile(&h, access, &oa, &iosb, windows.FILE_SHARE_READ|windows.FILE_SHARE_WRITE, disposition, 0, typ, 0, 0, 0xffffffff, uint32(c.InputBufferSize), uint32(c.OutputBufferSize), &timeout)
if err != nil {
if ntstatus, ok := err.(windows.NTStatus); ok {
err = ntstatus.Errno()
}
return 0, &os.PathError{Op: "open", Path: path, Err: err}
}
runtime.KeepAlive(ntPath)
return h, nil
}
func (l *pipeListener) makeServerPipe() (*file, error) {
h, err := makeServerPipeHandle(l.path, nil, &l.config, false)
if err != nil {
return nil, err
}
f, err := makeFile(h)
if err != nil {
windows.Close(h)
return nil, err
}
return f, nil
}
func (l *pipeListener) makeConnectedServerPipe() (*file, error) {
p, err := l.makeServerPipe()
if err != nil {
return nil, err
}
// Wait for the client to connect.
ch := make(chan error)
go func(p *file) {
ch <- connectPipe(p)
}(p)
select {
case err = <-ch:
if err != nil {
p.Close()
p = nil
}
case <-l.closeCh:
// Abort the connect request by closing the handle.
p.Close()
p = nil
err = <-ch
if err == nil || err == os.ErrClosed {
err = net.ErrClosed
}
}
return p, err
}
func (l *pipeListener) listenerRoutine() {
closed := false
for !closed {
select {
case <-l.closeCh:
closed = true
case responseCh := <-l.acceptCh:
var (
p *file
err error
)
for {
p, err = l.makeConnectedServerPipe()
// If the connection was immediately closed by the client, try
// again.
if err != windows.ERROR_NO_DATA {
break
}
}
responseCh <- acceptResponse{p, err}
closed = err == net.ErrClosed
}
}
windows.Close(l.firstHandle)
l.firstHandle = 0
// Notify Close and Accept callers that the handle has been closed.
close(l.doneCh)
}
// ListenConfig contains configuration for the pipe listener.
type ListenConfig struct {
// SecurityDescriptor contains a Windows security descriptor. If nil, the default from RtlDefaultNpAcl is used.
SecurityDescriptor *windows.SECURITY_DESCRIPTOR
// MessageMode determines whether the pipe is in byte or message mode. In either
// case the pipe is read in byte mode by default. The only practical difference in
// this implementation is that CloseWrite is only supported for message mode pipes;
// CloseWrite is implemented as a zero-byte write, but zero-byte writes are only
// transferred to the reader (and returned as io.EOF in this implementation)
// when the pipe is in message mode.
MessageMode bool
// InputBufferSize specifies the initial size of the input buffer, in bytes, which the OS will grow as needed.
InputBufferSize int32
// OutputBufferSize specifies the initial size of the output buffer, in bytes, which the OS will grow as needed.
OutputBufferSize int32
}
// Listen creates a listener on a Windows named pipe path,such as \\.\pipe\mypipe.
// The pipe must not already exist.
func Listen(path string, c *ListenConfig) (net.Listener, error) {
if c == nil {
c = &ListenConfig{}
}
h, err := makeServerPipeHandle(path, c.SecurityDescriptor, c, true)
if err != nil {
return nil, err
}
l := &pipeListener{
firstHandle: h,
path: path,
config: *c,
acceptCh: make(chan (chan acceptResponse)),
closeCh: make(chan int),
doneCh: make(chan int),
}
// The first connection is swallowed on Windows 7 & 8, so synthesize it.
if maj, _, _ := windows.RtlGetNtVersionNumbers(); maj <= 8 {
path16, err := windows.UTF16PtrFromString(path)
if err == nil {
h, err = windows.CreateFile(path16, 0, 0, nil, windows.OPEN_EXISTING, windows.SECURITY_SQOS_PRESENT|windows.SECURITY_ANONYMOUS, 0)
if err == nil {
windows.CloseHandle(h)
}
}
}
go l.listenerRoutine()
return l, nil
}
func connectPipe(p *file) error {
c, err := p.prepareIo()
if err != nil {
return err
}
defer p.wg.Done()
err = windows.ConnectNamedPipe(p.handle, &c.o)
_, err = p.asyncIo(c, nil, 0, err)
if err != nil && err != windows.ERROR_PIPE_CONNECTED {
return err
}
return nil
}
func (l *pipeListener) Accept() (net.Conn, error) {
ch := make(chan acceptResponse)
select {
case l.acceptCh <- ch:
response := <-ch
err := response.err
if err != nil {
return nil, err
}
if l.config.MessageMode {
return &messageBytePipe{
pipe: pipe{file: response.f, path: l.path},
}, nil
}
return &pipe{file: response.f, path: l.path}, nil
case <-l.doneCh:
return nil, net.ErrClosed
}
}
func (l *pipeListener) Close() error {
select {
case l.closeCh <- 1:
<-l.doneCh
case <-l.doneCh:
}
return nil
}
func (l *pipeListener) Addr() net.Addr {
return pipeAddress(l.path)
}

660
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// +build windows
/* SPDX-License-Identifier: MIT
*
* Copyright (C) 2005 Microsoft
* Copyright (C) 2017-2021 WireGuard LLC. All Rights Reserved.
*/
package winpipe_test
import (
"bufio"
"bytes"
"context"
"errors"
"io"
"net"
"os"
"sync"
"syscall"
"testing"
"time"
"golang.org/x/sys/windows"
"golang.zx2c4.com/wireguard/ipc/winpipe"
)
func randomPipePath() string {
guid, err := windows.GenerateGUID()
if err != nil {
panic(err)
}
return `\\.\PIPE\go-winpipe-test-` + guid.String()
}
func TestPingPong(t *testing.T) {
const (
ping = 42
pong = 24
)
pipePath := randomPipePath()
listener, err := winpipe.Listen(pipePath, nil)
if err != nil {
t.Fatalf("unable to listen on pipe: %v", err)
}
defer listener.Close()
go func() {
incoming, err := listener.Accept()
if err != nil {
t.Fatalf("unable to accept pipe connection: %v", err)
}
defer incoming.Close()
var data [1]byte
_, err = incoming.Read(data[:])
if err != nil {
t.Fatalf("unable to read ping from pipe: %v", err)
}
if data[0] != ping {
t.Fatalf("expected ping, got %d", data[0])
}
data[0] = pong
_, err = incoming.Write(data[:])
if err != nil {
t.Fatalf("unable to write pong to pipe: %v", err)
}
}()
client, err := winpipe.Dial(pipePath, nil, nil)
if err != nil {
t.Fatalf("unable to dial pipe: %v", err)
}
defer client.Close()
var data [1]byte
data[0] = ping
_, err = client.Write(data[:])
if err != nil {
t.Fatalf("unable to write ping to pipe: %v", err)
}
_, err = client.Read(data[:])
if err != nil {
t.Fatalf("unable to read pong from pipe: %v", err)
}
if data[0] != pong {
t.Fatalf("expected pong, got %d", data[0])
}
}
func TestDialUnknownFailsImmediately(t *testing.T) {
_, err := winpipe.Dial(randomPipePath(), nil, nil)
if !errors.Is(err, syscall.ENOENT) {
t.Fatalf("expected ENOENT got %v", err)
}
}
func TestDialListenerTimesOut(t *testing.T) {
pipePath := randomPipePath()
l, err := winpipe.Listen(pipePath, nil)
if err != nil {
t.Fatal(err)
}
defer l.Close()
d := 10 * time.Millisecond
_, err = winpipe.Dial(pipePath, &d, nil)
if err != os.ErrDeadlineExceeded {
t.Fatalf("expected os.ErrDeadlineExceeded, got %v", err)
}
}
func TestDialContextListenerTimesOut(t *testing.T) {
pipePath := randomPipePath()
l, err := winpipe.Listen(pipePath, nil)
if err != nil {
t.Fatal(err)
}
defer l.Close()
d := 10 * time.Millisecond
ctx, _ := context.WithTimeout(context.Background(), d)
_, err = winpipe.DialContext(ctx, pipePath, nil)
if err != context.DeadlineExceeded {
t.Fatalf("expected context.DeadlineExceeded, got %v", err)
}
}
func TestDialListenerGetsCancelled(t *testing.T) {
pipePath := randomPipePath()
ctx, cancel := context.WithCancel(context.Background())
l, err := winpipe.Listen(pipePath, nil)
if err != nil {
t.Fatal(err)
}
ch := make(chan error)
defer l.Close()
go func(ctx context.Context, ch chan error) {
_, err := winpipe.DialContext(ctx, pipePath, nil)
ch <- err
}(ctx, ch)
time.Sleep(time.Millisecond * 30)
cancel()
err = <-ch
if err != context.Canceled {
t.Fatalf("expected context.Canceled, got %v", err)
}
}
func TestDialAccessDeniedWithRestrictedSD(t *testing.T) {
if windows.NewLazySystemDLL("ntdll.dll").NewProc("wine_get_version").Find() == nil {
t.Skip("dacls on named pipes are broken on wine")
}
pipePath := randomPipePath()
sd, _ := windows.SecurityDescriptorFromString("D:")
c := winpipe.ListenConfig{
SecurityDescriptor: sd,
}
l, err := winpipe.Listen(pipePath, &c)
if err != nil {
t.Fatal(err)
}
defer l.Close()
_, err = winpipe.Dial(pipePath, nil, nil)
if !errors.Is(err, windows.ERROR_ACCESS_DENIED) {
t.Fatalf("expected ERROR_ACCESS_DENIED, got %v", err)
}
}
func getConnection(cfg *winpipe.ListenConfig) (client net.Conn, server net.Conn, err error) {
pipePath := randomPipePath()
l, err := winpipe.Listen(pipePath, cfg)
if err != nil {
return
}
defer l.Close()
type response struct {
c net.Conn
err error
}
ch := make(chan response)
go func() {
c, err := l.Accept()
ch <- response{c, err}
}()
c, err := winpipe.Dial(pipePath, nil, nil)
if err != nil {
return
}
r := <-ch
if err = r.err; err != nil {
c.Close()
return
}
client = c
server = r.c
return
}
func TestReadTimeout(t *testing.T) {
c, s, err := getConnection(nil)
if err != nil {
t.Fatal(err)
}
defer c.Close()
defer s.Close()
c.SetReadDeadline(time.Now().Add(10 * time.Millisecond))
buf := make([]byte, 10)
_, err = c.Read(buf)
if err != os.ErrDeadlineExceeded {
t.Fatalf("expected os.ErrDeadlineExceeded, got %v", err)
}
}
func server(l net.Listener, ch chan int) {
c, err := l.Accept()
if err != nil {
panic(err)
}
rw := bufio.NewReadWriter(bufio.NewReader(c), bufio.NewWriter(c))
s, err := rw.ReadString('\n')
if err != nil {
panic(err)
}
_, err = rw.WriteString("got " + s)
if err != nil {
panic(err)
}
err = rw.Flush()
if err != nil {
panic(err)
}
c.Close()
ch <- 1
}
func TestFullListenDialReadWrite(t *testing.T) {
pipePath := randomPipePath()
l, err := winpipe.Listen(pipePath, nil)
if err != nil {
t.Fatal(err)
}
defer l.Close()
ch := make(chan int)
go server(l, ch)
c, err := winpipe.Dial(pipePath, nil, nil)
if err != nil {
t.Fatal(err)
}
defer c.Close()
rw := bufio.NewReadWriter(bufio.NewReader(c), bufio.NewWriter(c))
_, err = rw.WriteString("hello world\n")
if err != nil {
t.Fatal(err)
}
err = rw.Flush()
if err != nil {
t.Fatal(err)
}
s, err := rw.ReadString('\n')
if err != nil {
t.Fatal(err)
}
ms := "got hello world\n"
if s != ms {
t.Errorf("expected '%s', got '%s'", ms, s)
}
<-ch
}
func TestCloseAbortsListen(t *testing.T) {
pipePath := randomPipePath()
l, err := winpipe.Listen(pipePath, nil)
if err != nil {
t.Fatal(err)
}
ch := make(chan error)
go func() {
_, err := l.Accept()
ch <- err
}()
time.Sleep(30 * time.Millisecond)
l.Close()
err = <-ch
if err != net.ErrClosed {
t.Fatalf("expected net.ErrClosed, got %v", err)
}
}
func ensureEOFOnClose(t *testing.T, r io.Reader, w io.Closer) {
b := make([]byte, 10)
w.Close()
n, err := r.Read(b)
if n > 0 {
t.Errorf("unexpected byte count %d", n)
}
if err != io.EOF {
t.Errorf("expected EOF: %v", err)
}
}
func TestCloseClientEOFServer(t *testing.T) {
c, s, err := getConnection(nil)
if err != nil {
t.Fatal(err)
}
defer c.Close()
defer s.Close()
ensureEOFOnClose(t, c, s)
}
func TestCloseServerEOFClient(t *testing.T) {
c, s, err := getConnection(nil)
if err != nil {
t.Fatal(err)
}
defer c.Close()
defer s.Close()
ensureEOFOnClose(t, s, c)
}
func TestCloseWriteEOF(t *testing.T) {
cfg := &winpipe.ListenConfig{
MessageMode: true,
}
c, s, err := getConnection(cfg)
if err != nil {
t.Fatal(err)
}
defer c.Close()
defer s.Close()
type closeWriter interface {
CloseWrite() error
}
err = c.(closeWriter).CloseWrite()
if err != nil {
t.Fatal(err)
}
b := make([]byte, 10)
_, err = s.Read(b)
if err != io.EOF {
t.Fatal(err)
}
}
func TestAcceptAfterCloseFails(t *testing.T) {
pipePath := randomPipePath()
l, err := winpipe.Listen(pipePath, nil)
if err != nil {
t.Fatal(err)
}
l.Close()
_, err = l.Accept()
if err != net.ErrClosed {
t.Fatalf("expected net.ErrClosed, got %v", err)
}
}
func TestDialTimesOutByDefault(t *testing.T) {
pipePath := randomPipePath()
l, err := winpipe.Listen(pipePath, nil)
if err != nil {
t.Fatal(err)
}
defer l.Close()
_, err = winpipe.Dial(pipePath, nil, nil)
if err != os.ErrDeadlineExceeded {
t.Fatalf("expected os.ErrDeadlineExceeded, got %v", err)
}
}
func TestTimeoutPendingRead(t *testing.T) {
pipePath := randomPipePath()
l, err := winpipe.Listen(pipePath, nil)
if err != nil {
t.Fatal(err)
}
defer l.Close()
serverDone := make(chan struct{})
go func() {
s, err := l.Accept()
if err != nil {
t.Fatal(err)
}
time.Sleep(1 * time.Second)
s.Close()
close(serverDone)
}()
client, err := winpipe.Dial(pipePath, nil, nil)
if err != nil {
t.Fatal(err)
}
defer client.Close()
clientErr := make(chan error)
go func() {
buf := make([]byte, 10)
_, err = client.Read(buf)
clientErr <- err
}()
time.Sleep(100 * time.Millisecond) // make *sure* the pipe is reading before we set the deadline
client.SetReadDeadline(time.Unix(1, 0))
select {
case err = <-clientErr:
if err != os.ErrDeadlineExceeded {
t.Fatalf("expected os.ErrDeadlineExceeded, got %v", err)
}
case <-time.After(100 * time.Millisecond):
t.Fatalf("timed out while waiting for read to cancel")
<-clientErr
}
<-serverDone
}
func TestTimeoutPendingWrite(t *testing.T) {
pipePath := randomPipePath()
l, err := winpipe.Listen(pipePath, nil)
if err != nil {
t.Fatal(err)
}
defer l.Close()
serverDone := make(chan struct{})
go func() {
s, err := l.Accept()
if err != nil {
t.Fatal(err)
}
time.Sleep(1 * time.Second)
s.Close()
close(serverDone)
}()
client, err := winpipe.Dial(pipePath, nil, nil)
if err != nil {
t.Fatal(err)
}
defer client.Close()
clientErr := make(chan error)
go func() {
_, err = client.Write([]byte("this should timeout"))
clientErr <- err
}()
time.Sleep(100 * time.Millisecond) // make *sure* the pipe is writing before we set the deadline
client.SetWriteDeadline(time.Unix(1, 0))
select {
case err = <-clientErr:
if err != os.ErrDeadlineExceeded {
t.Fatalf("expected os.ErrDeadlineExceeded, got %v", err)
}
case <-time.After(100 * time.Millisecond):
t.Fatalf("timed out while waiting for write to cancel")
<-clientErr
}
<-serverDone
}
type CloseWriter interface {
CloseWrite() error
}
func TestEchoWithMessaging(t *testing.T) {
c := winpipe.ListenConfig{
MessageMode: true, // Use message mode so that CloseWrite() is supported
InputBufferSize: 65536, // Use 64KB buffers to improve performance
OutputBufferSize: 65536,
}
pipePath := randomPipePath()
l, err := winpipe.Listen(pipePath, &c)
if err != nil {
t.Fatal(err)
}
defer l.Close()
listenerDone := make(chan bool)
clientDone := make(chan bool)
go func() {
// server echo
conn, e := l.Accept()
if e != nil {
t.Fatal(e)
}
defer conn.Close()
time.Sleep(500 * time.Millisecond) // make *sure* we don't begin to read before eof signal is sent
io.Copy(conn, conn)
conn.(CloseWriter).CloseWrite()
close(listenerDone)
}()
timeout := 1 * time.Second
client, err := winpipe.Dial(pipePath, &timeout, nil)
if err != nil {
t.Fatal(err)
}
defer client.Close()
go func() {
// client read back
bytes := make([]byte, 2)
n, e := client.Read(bytes)
if e != nil {
t.Fatal(e)
}
if n != 2 {
t.Fatalf("expected 2 bytes, got %v", n)
}
close(clientDone)
}()
payload := make([]byte, 2)
payload[0] = 0
payload[1] = 1
n, err := client.Write(payload)
if err != nil {
t.Fatal(err)
}
if n != 2 {
t.Fatalf("expected 2 bytes, got %v", n)
}
client.(CloseWriter).CloseWrite()
<-listenerDone
<-clientDone
}
func TestConnectRace(t *testing.T) {
pipePath := randomPipePath()
l, err := winpipe.Listen(pipePath, nil)
if err != nil {
t.Fatal(err)
}
defer l.Close()
go func() {
for {
s, err := l.Accept()
if err == net.ErrClosed {
return
}
if err != nil {
t.Fatal(err)
}
s.Close()
}
}()
for i := 0; i < 1000; i++ {
c, err := winpipe.Dial(pipePath, nil, nil)
if err != nil {
t.Fatal(err)
}
c.Close()
}
}
func TestMessageReadMode(t *testing.T) {
if maj, _, _ := windows.RtlGetNtVersionNumbers(); maj <= 8 {
t.Skipf("Skipping on Windows %d", maj)
}
var wg sync.WaitGroup
defer wg.Wait()
pipePath := randomPipePath()
l, err := winpipe.Listen(pipePath, &winpipe.ListenConfig{MessageMode: true})
if err != nil {
t.Fatal(err)
}
defer l.Close()
msg := ([]byte)("hello world")
wg.Add(1)
go func() {
defer wg.Done()
s, err := l.Accept()
if err != nil {
t.Fatal(err)
}
_, err = s.Write(msg)
if err != nil {
t.Fatal(err)
}
s.Close()
}()
c, err := winpipe.Dial(pipePath, nil, nil)
if err != nil {
t.Fatal(err)
}
defer c.Close()
mode := uint32(windows.PIPE_READMODE_MESSAGE)
err = windows.SetNamedPipeHandleState(c.(interface{ Handle() windows.Handle }).Handle(), &mode, nil, nil)
if err != nil {
t.Fatal(err)
}
ch := make([]byte, 1)
var vmsg []byte
for {
n, err := c.Read(ch)
if err == io.EOF {
break
}
if err != nil {
t.Fatal(err)
}
if n != 1 {
t.Fatalf("expected 1, got %d", n)
}
vmsg = append(vmsg, ch[0])
}
if !bytes.Equal(msg, vmsg) {
t.Fatalf("expected %s, got %s", msg, vmsg)
}
}
func TestListenConnectRace(t *testing.T) {
if testing.Short() {
t.Skip("Skipping long race test")
}
pipePath := randomPipePath()
for i := 0; i < 50 && !t.Failed(); i++ {
var wg sync.WaitGroup
wg.Add(1)
go func() {
c, err := winpipe.Dial(pipePath, nil, nil)
if err == nil {
c.Close()
}
wg.Done()
}()
s, err := winpipe.Listen(pipePath, nil)
if err != nil {
t.Error(i, err)
} else {
s.Close()
}
wg.Wait()
}
}

238
ipc/winpipe/zsyscall_windows.go
View File

@ -1,238 +0,0 @@
// Code generated by 'go generate'; DO NOT EDIT.
package winpipe
import (
"syscall"
"unsafe"
"golang.org/x/sys/windows"
)
var _ unsafe.Pointer
// Do the interface allocations only once for common
// Errno values.
const (
errnoERROR_IO_PENDING = 997
)
var (
errERROR_IO_PENDING error = syscall.Errno(errnoERROR_IO_PENDING)
)
// errnoErr returns common boxed Errno values, to prevent
// allocations at runtime.
func errnoErr(e syscall.Errno) error {
switch e {
case 0:
return nil
case errnoERROR_IO_PENDING:
return errERROR_IO_PENDING
}
// TODO: add more here, after collecting data on the common
// error values see on Windows. (perhaps when running
// all.bat?)
return e
}
var (
modkernel32 = windows.NewLazySystemDLL("kernel32.dll")
modntdll = windows.NewLazySystemDLL("ntdll.dll")
modws2_32 = windows.NewLazySystemDLL("ws2_32.dll")
procConnectNamedPipe = modkernel32.NewProc("ConnectNamedPipe")
procCreateNamedPipeW = modkernel32.NewProc("CreateNamedPipeW")
procCreateFileW = modkernel32.NewProc("CreateFileW")
procGetNamedPipeInfo = modkernel32.NewProc("GetNamedPipeInfo")
procGetNamedPipeHandleStateW = modkernel32.NewProc("GetNamedPipeHandleStateW")
procLocalAlloc = modkernel32.NewProc("LocalAlloc")
procNtCreateNamedPipeFile = modntdll.NewProc("NtCreateNamedPipeFile")
procRtlNtStatusToDosErrorNoTeb = modntdll.NewProc("RtlNtStatusToDosErrorNoTeb")
procRtlDosPathNameToNtPathName_U = modntdll.NewProc("RtlDosPathNameToNtPathName_U")
procRtlDefaultNpAcl = modntdll.NewProc("RtlDefaultNpAcl")
procCancelIoEx = modkernel32.NewProc("CancelIoEx")
procCreateIoCompletionPort = modkernel32.NewProc("CreateIoCompletionPort")
procGetQueuedCompletionStatus = modkernel32.NewProc("GetQueuedCompletionStatus")
procSetFileCompletionNotificationModes = modkernel32.NewProc("SetFileCompletionNotificationModes")
procWSAGetOverlappedResult = modws2_32.NewProc("WSAGetOverlappedResult")
)
func connectNamedPipe(pipe windows.Handle, o *windows.Overlapped) (err error) {
r1, _, e1 := syscall.Syscall(procConnectNamedPipe.Addr(), 2, uintptr(pipe), uintptr(unsafe.Pointer(o)), 0)
if r1 == 0 {
if e1 != 0 {
err = errnoErr(e1)
} else {
err = syscall.EINVAL
}
}
return
}
func createNamedPipe(name string, flags uint32, pipeMode uint32, maxInstances uint32, outSize uint32, inSize uint32, defaultTimeout uint32, sa *windows.SecurityAttributes) (handle windows.Handle, err error) {
var _p0 *uint16
_p0, err = syscall.UTF16PtrFromString(name)
if err != nil {
return
}
return _createNamedPipe(_p0, flags, pipeMode, maxInstances, outSize, inSize, defaultTimeout, sa)
}
func _createNamedPipe(name *uint16, flags uint32, pipeMode uint32, maxInstances uint32, outSize uint32, inSize uint32, defaultTimeout uint32, sa *windows.SecurityAttributes) (handle windows.Handle, err error) {
r0, _, e1 := syscall.Syscall9(procCreateNamedPipeW.Addr(), 8, uintptr(unsafe.Pointer(name)), uintptr(flags), uintptr(pipeMode), uintptr(maxInstances), uintptr(outSize), uintptr(inSize), uintptr(defaultTimeout), uintptr(unsafe.Pointer(sa)), 0)
handle = windows.Handle(r0)
if handle == windows.InvalidHandle {
if e1 != 0 {
err = errnoErr(e1)
} else {
err = syscall.EINVAL
}
}
return
}
func createFile(name string, access uint32, mode uint32, sa *windows.SecurityAttributes, createmode uint32, attrs uint32, templatefile windows.Handle) (handle windows.Handle, err error) {
var _p0 *uint16
_p0, err = syscall.UTF16PtrFromString(name)
if err != nil {
return
}
return _createFile(_p0, access, mode, sa, createmode, attrs, templatefile)
}
func _createFile(name *uint16, access uint32, mode uint32, sa *windows.SecurityAttributes, createmode uint32, attrs uint32, templatefile windows.Handle) (handle windows.Handle, err error) {
r0, _, e1 := syscall.Syscall9(procCreateFileW.Addr(), 7, uintptr(unsafe.Pointer(name)), uintptr(access), uintptr(mode), uintptr(unsafe.Pointer(sa)), uintptr(createmode), uintptr(attrs), uintptr(templatefile), 0, 0)
handle = windows.Handle(r0)
if handle == windows.InvalidHandle {
if e1 != 0 {
err = errnoErr(e1)
} else {
err = syscall.EINVAL
}
}
return
}
func getNamedPipeInfo(pipe windows.Handle, flags *uint32, outSize *uint32, inSize *uint32, maxInstances *uint32) (err error) {
r1, _, e1 := syscall.Syscall6(procGetNamedPipeInfo.Addr(), 5, uintptr(pipe), uintptr(unsafe.Pointer(flags)), uintptr(unsafe.Pointer(outSize)), uintptr(unsafe.Pointer(inSize)), uintptr(unsafe.Pointer(maxInstances)), 0)
if r1 == 0 {
if e1 != 0 {
err = errnoErr(e1)
} else {
err = syscall.EINVAL
}
}
return
}
func getNamedPipeHandleState(pipe windows.Handle, state *uint32, curInstances *uint32, maxCollectionCount *uint32, collectDataTimeout *uint32, userName *uint16, maxUserNameSize uint32) (err error) {
r1, _, e1 := syscall.Syscall9(procGetNamedPipeHandleStateW.Addr(), 7, uintptr(pipe), uintptr(unsafe.Pointer(state)), uintptr(unsafe.Pointer(curInstances)), uintptr(unsafe.Pointer(maxCollectionCount)), uintptr(unsafe.Pointer(collectDataTimeout)), uintptr(unsafe.Pointer(userName)), uintptr(maxUserNameSize), 0, 0)
if r1 == 0 {
if e1 != 0 {
err = errnoErr(e1)
} else {
err = syscall.EINVAL
}
}
return
}
func localAlloc(uFlags uint32, length uint32) (ptr uintptr) {
r0, _, _ := syscall.Syscall(procLocalAlloc.Addr(), 2, uintptr(uFlags), uintptr(length), 0)
ptr = uintptr(r0)
return
}
func ntCreateNamedPipeFile(pipe *windows.Handle, access uint32, oa *objectAttributes, iosb *ioStatusBlock, share uint32, disposition uint32, options uint32, typ uint32, readMode uint32, completionMode uint32, maxInstances uint32, inboundQuota uint32, outputQuota uint32, timeout *int64) (status ntstatus) {
r0, _, _ := syscall.Syscall15(procNtCreateNamedPipeFile.Addr(), 14, uintptr(unsafe.Pointer(pipe)), uintptr(access), uintptr(unsafe.Pointer(oa)), uintptr(unsafe.Pointer(iosb)), uintptr(share), uintptr(disposition), uintptr(options), uintptr(typ), uintptr(readMode), uintptr(completionMode), uintptr(maxInstances), uintptr(inboundQuota), uintptr(outputQuota), uintptr(unsafe.Pointer(timeout)), 0)
status = ntstatus(r0)
return
}
func rtlNtStatusToDosError(status ntstatus) (winerr error) {
r0, _, _ := syscall.Syscall(procRtlNtStatusToDosErrorNoTeb.Addr(), 1, uintptr(status), 0, 0)
if r0 != 0 {
winerr = syscall.Errno(r0)
}
return
}
func rtlDosPathNameToNtPathName(name *uint16, ntName *unicodeString, filePart uintptr, reserved uintptr) (status ntstatus) {
r0, _, _ := syscall.Syscall6(procRtlDosPathNameToNtPathName_U.Addr(), 4, uintptr(unsafe.Pointer(name)), uintptr(unsafe.Pointer(ntName)), uintptr(filePart), uintptr(reserved), 0, 0)
status = ntstatus(r0)
return
}
func rtlDefaultNpAcl(dacl *uintptr) (status ntstatus) {
r0, _, _ := syscall.Syscall(procRtlDefaultNpAcl.Addr(), 1, uintptr(unsafe.Pointer(dacl)), 0, 0)
status = ntstatus(r0)
return
}
func cancelIoEx(file windows.Handle, o *windows.Overlapped) (err error) {
r1, _, e1 := syscall.Syscall(procCancelIoEx.Addr(), 2, uintptr(file), uintptr(unsafe.Pointer(o)), 0)
if r1 == 0 {
if e1 != 0 {
err = errnoErr(e1)
} else {
err = syscall.EINVAL
}
}
return
}
func createIoCompletionPort(file windows.Handle, port windows.Handle, key uintptr, threadCount uint32) (newport windows.Handle, err error) {
r0, _, e1 := syscall.Syscall6(procCreateIoCompletionPort.Addr(), 4, uintptr(file), uintptr(port), uintptr(key), uintptr(threadCount), 0, 0)
newport = windows.Handle(r0)
if newport == 0 {
if e1 != 0 {
err = errnoErr(e1)
} else {
err = syscall.EINVAL
}
}
return
}
func getQueuedCompletionStatus(port windows.Handle, bytes *uint32, key *uintptr, o **ioOperation, timeout uint32) (err error) {
r1, _, e1 := syscall.Syscall6(procGetQueuedCompletionStatus.Addr(), 5, uintptr(port), uintptr(unsafe.Pointer(bytes)), uintptr(unsafe.Pointer(key)), uintptr(unsafe.Pointer(o)), uintptr(timeout), 0)
if r1 == 0 {
if e1 != 0 {
err = errnoErr(e1)
} else {
err = syscall.EINVAL
}
}
return
}
func setFileCompletionNotificationModes(h windows.Handle, flags uint8) (err error) {
r1, _, e1 := syscall.Syscall(procSetFileCompletionNotificationModes.Addr(), 2, uintptr(h), uintptr(flags), 0)
if r1 == 0 {
if e1 != 0 {
err = errnoErr(e1)
} else {
err = syscall.EINVAL
}
}
return
}
func wsaGetOverlappedResult(h windows.Handle, o *windows.Overlapped, bytes *uint32, wait bool, flags *uint32) (err error) {
var _p0 uint32
if wait {
_p0 = 1
} else {
_p0 = 0
}
r1, _, e1 := syscall.Syscall6(procWSAGetOverlappedResult.Addr(), 5, uintptr(h), uintptr(unsafe.Pointer(o)), uintptr(unsafe.Pointer(bytes)), uintptr(_p0), uintptr(unsafe.Pointer(flags)), 0)
if r1 == 0 {
if e1 != 0 {
err = errnoErr(e1)
} else {
err = syscall.EINVAL
}
}
return
}