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510 lines
14 KiB
Go
510 lines
14 KiB
Go
// +build windows
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/* SPDX-License-Identifier: MIT
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*
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* Copyright (C) 2005 Microsoft
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* Copyright (C) 2017-2019 WireGuard LLC. All Rights Reserved.
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*/
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package winpipe
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import (
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"context"
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"errors"
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"fmt"
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"io"
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"net"
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"os"
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"runtime"
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"time"
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"unsafe"
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"golang.org/x/sys/windows"
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)
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//sys connectNamedPipe(pipe windows.Handle, o *windows.Overlapped) (err error) = ConnectNamedPipe
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//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
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//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
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//sys getNamedPipeInfo(pipe windows.Handle, flags *uint32, outSize *uint32, inSize *uint32, maxInstances *uint32) (err error) = GetNamedPipeInfo
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//sys getNamedPipeHandleState(pipe windows.Handle, state *uint32, curInstances *uint32, maxCollectionCount *uint32, collectDataTimeout *uint32, userName *uint16, maxUserNameSize uint32) (err error) = GetNamedPipeHandleStateW
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//sys localAlloc(uFlags uint32, length uint32) (ptr uintptr) = LocalAlloc
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//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
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//sys rtlNtStatusToDosError(status ntstatus) (winerr error) = ntdll.RtlNtStatusToDosErrorNoTeb
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//sys rtlDosPathNameToNtPathName(name *uint16, ntName *unicodeString, filePart uintptr, reserved uintptr) (status ntstatus) = ntdll.RtlDosPathNameToNtPathName_U
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//sys rtlDefaultNpAcl(dacl *uintptr) (status ntstatus) = ntdll.RtlDefaultNpAcl
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type ioStatusBlock struct {
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Status, Information uintptr
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}
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type objectAttributes struct {
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Length uintptr
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RootDirectory uintptr
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ObjectName *unicodeString
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Attributes uintptr
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SecurityDescriptor *windows.SECURITY_DESCRIPTOR
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SecurityQoS uintptr
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}
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type unicodeString struct {
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Length uint16
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MaximumLength uint16
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Buffer uintptr
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}
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type ntstatus int32
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func (status ntstatus) Err() error {
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if status >= 0 {
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return nil
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}
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return rtlNtStatusToDosError(status)
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}
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const (
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cSECURITY_SQOS_PRESENT = 0x100000
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cSECURITY_ANONYMOUS = 0
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cPIPE_TYPE_MESSAGE = 4
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cPIPE_READMODE_MESSAGE = 2
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cFILE_OPEN = 1
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cFILE_CREATE = 2
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cFILE_PIPE_MESSAGE_TYPE = 1
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cFILE_PIPE_REJECT_REMOTE_CLIENTS = 2
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)
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var (
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// ErrPipeListenerClosed is returned for pipe operations on listeners that have been closed.
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// This error should match net.errClosing since docker takes a dependency on its text.
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ErrPipeListenerClosed = errors.New("use of closed network connection")
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errPipeWriteClosed = errors.New("pipe has been closed for write")
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)
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type win32Pipe struct {
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*win32File
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path string
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}
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type win32MessageBytePipe struct {
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win32Pipe
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writeClosed bool
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readEOF bool
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}
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type pipeAddress string
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func (f *win32Pipe) LocalAddr() net.Addr {
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return pipeAddress(f.path)
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}
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func (f *win32Pipe) RemoteAddr() net.Addr {
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return pipeAddress(f.path)
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}
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func (f *win32Pipe) SetDeadline(t time.Time) error {
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f.SetReadDeadline(t)
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f.SetWriteDeadline(t)
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return nil
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}
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// CloseWrite closes the write side of a message pipe in byte mode.
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func (f *win32MessageBytePipe) CloseWrite() error {
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if f.writeClosed {
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return errPipeWriteClosed
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}
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err := f.win32File.Flush()
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if err != nil {
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return err
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}
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_, err = f.win32File.Write(nil)
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if err != nil {
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return err
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}
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f.writeClosed = true
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return nil
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}
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// Write writes bytes to a message pipe in byte mode. Zero-byte writes are ignored, since
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// they are used to implement CloseWrite().
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func (f *win32MessageBytePipe) Write(b []byte) (int, error) {
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if f.writeClosed {
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return 0, errPipeWriteClosed
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}
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if len(b) == 0 {
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return 0, nil
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}
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return f.win32File.Write(b)
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}
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// Read reads bytes from a message pipe in byte mode. A read of a zero-byte message on a message
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// mode pipe will return io.EOF, as will all subsequent reads.
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func (f *win32MessageBytePipe) Read(b []byte) (int, error) {
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if f.readEOF {
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return 0, io.EOF
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}
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n, err := f.win32File.Read(b)
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if err == io.EOF {
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// If this was the result of a zero-byte read, then
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// it is possible that the read was due to a zero-size
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// message. Since we are simulating CloseWrite with a
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// zero-byte message, ensure that all future Read() calls
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// also return EOF.
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f.readEOF = true
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} else if err == windows.ERROR_MORE_DATA {
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// ERROR_MORE_DATA indicates that the pipe's read mode is message mode
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// and the message still has more bytes. Treat this as a success, since
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// this package presents all named pipes as byte streams.
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err = nil
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}
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return n, err
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}
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func (s pipeAddress) Network() string {
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return "pipe"
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}
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func (s pipeAddress) String() string {
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return string(s)
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}
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// tryDialPipe attempts to dial the pipe at `path` until `ctx` cancellation or timeout.
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func tryDialPipe(ctx context.Context, path *string) (windows.Handle, error) {
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for {
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select {
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case <-ctx.Done():
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return windows.Handle(0), ctx.Err()
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default:
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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)
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if err == nil {
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return h, nil
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}
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if err != windows.ERROR_PIPE_BUSY {
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return h, &os.PathError{Err: err, Op: "open", Path: *path}
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}
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// Wait 10 msec and try again. This is a rather simplistic
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// view, as we always try each 10 milliseconds.
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time.Sleep(time.Millisecond * 10)
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}
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}
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}
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// DialPipe connects to a named pipe by path, timing out if the connection
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// takes longer than the specified duration. If timeout is nil, then we use
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// a default timeout of 2 seconds. (We do not use WaitNamedPipe.)
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func DialPipe(path string, timeout *time.Duration, expectedOwner *windows.SID) (net.Conn, error) {
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var absTimeout time.Time
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if timeout != nil {
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absTimeout = time.Now().Add(*timeout)
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} else {
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absTimeout = time.Now().Add(time.Second * 2)
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}
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ctx, _ := context.WithDeadline(context.Background(), absTimeout)
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conn, err := DialPipeContext(ctx, path, expectedOwner)
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if err == context.DeadlineExceeded {
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return nil, ErrTimeout
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}
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return conn, err
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}
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// DialPipeContext attempts to connect to a named pipe by `path` until `ctx`
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// cancellation or timeout.
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func DialPipeContext(ctx context.Context, path string, expectedOwner *windows.SID) (net.Conn, error) {
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var err error
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var h windows.Handle
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h, err = tryDialPipe(ctx, &path)
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if err != nil {
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return nil, err
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}
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if expectedOwner != nil {
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sd, err := windows.GetSecurityInfo(h, windows.SE_FILE_OBJECT, windows.OWNER_SECURITY_INFORMATION)
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if err != nil {
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windows.Close(h)
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return nil, err
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}
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realOwner, _, err := sd.Owner()
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if err != nil {
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windows.Close(h)
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return nil, err
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}
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if !realOwner.Equals(expectedOwner) {
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windows.Close(h)
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return nil, windows.ERROR_ACCESS_DENIED
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}
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}
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var flags uint32
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err = getNamedPipeInfo(h, &flags, nil, nil, nil)
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if err != nil {
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windows.Close(h)
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return nil, err
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}
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f, err := makeWin32File(h)
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if err != nil {
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windows.Close(h)
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return nil, err
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}
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// If the pipe is in message mode, return a message byte pipe, which
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// supports CloseWrite().
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if flags&cPIPE_TYPE_MESSAGE != 0 {
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return &win32MessageBytePipe{
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win32Pipe: win32Pipe{win32File: f, path: path},
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}, nil
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}
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return &win32Pipe{win32File: f, path: path}, nil
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}
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type acceptResponse struct {
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f *win32File
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err error
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}
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type win32PipeListener struct {
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firstHandle windows.Handle
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path string
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config PipeConfig
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acceptCh chan (chan acceptResponse)
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closeCh chan int
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doneCh chan int
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}
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func makeServerPipeHandle(path string, sd *windows.SECURITY_DESCRIPTOR, c *PipeConfig, first bool) (windows.Handle, error) {
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path16, err := windows.UTF16FromString(path)
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if err != nil {
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return 0, &os.PathError{Op: "open", Path: path, Err: err}
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}
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var oa objectAttributes
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oa.Length = unsafe.Sizeof(oa)
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var ntPath unicodeString
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if err := rtlDosPathNameToNtPathName(&path16[0], &ntPath, 0, 0).Err(); err != nil {
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return 0, &os.PathError{Op: "open", Path: path, Err: err}
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}
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defer windows.LocalFree(windows.Handle(ntPath.Buffer))
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oa.ObjectName = &ntPath
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// The security descriptor is only needed for the first pipe.
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if first {
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if sd != nil {
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oa.SecurityDescriptor = sd
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} else {
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// Construct the default named pipe security descriptor.
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var dacl uintptr
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if err := rtlDefaultNpAcl(&dacl).Err(); err != nil {
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return 0, fmt.Errorf("getting default named pipe ACL: %s", err)
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}
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defer windows.LocalFree(windows.Handle(dacl))
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sd, err := windows.NewSecurityDescriptor()
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if err != nil {
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return 0, fmt.Errorf("creating new security descriptor: %s", err)
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}
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if err = sd.SetDACL((*windows.ACL)(unsafe.Pointer(dacl)), true, false); err != nil {
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return 0, fmt.Errorf("assigning dacl: %s", err)
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}
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sd, err = sd.ToSelfRelative()
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if err != nil {
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return 0, fmt.Errorf("converting to self-relative: %s", err)
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}
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oa.SecurityDescriptor = sd
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}
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}
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typ := uint32(cFILE_PIPE_REJECT_REMOTE_CLIENTS)
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if c.MessageMode {
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typ |= cFILE_PIPE_MESSAGE_TYPE
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}
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disposition := uint32(cFILE_OPEN)
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access := uint32(windows.GENERIC_READ | windows.GENERIC_WRITE | windows.SYNCHRONIZE)
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if first {
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disposition = cFILE_CREATE
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// By not asking for read or write access, the named pipe file system
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// will put this pipe into an initially disconnected state, blocking
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// client connections until the next call with first == false.
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access = windows.SYNCHRONIZE
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}
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timeout := int64(-50 * 10000) // 50ms
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var (
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h windows.Handle
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iosb ioStatusBlock
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)
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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()
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if err != nil {
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return 0, &os.PathError{Op: "open", Path: path, Err: err}
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}
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runtime.KeepAlive(ntPath)
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return h, nil
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}
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func (l *win32PipeListener) makeServerPipe() (*win32File, error) {
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h, err := makeServerPipeHandle(l.path, nil, &l.config, false)
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if err != nil {
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return nil, err
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}
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f, err := makeWin32File(h)
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if err != nil {
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windows.Close(h)
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return nil, err
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}
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return f, nil
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}
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func (l *win32PipeListener) makeConnectedServerPipe() (*win32File, error) {
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p, err := l.makeServerPipe()
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if err != nil {
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return nil, err
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}
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// Wait for the client to connect.
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ch := make(chan error)
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go func(p *win32File) {
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ch <- connectPipe(p)
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}(p)
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select {
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case err = <-ch:
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if err != nil {
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p.Close()
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p = nil
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}
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case <-l.closeCh:
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// Abort the connect request by closing the handle.
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p.Close()
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p = nil
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err = <-ch
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if err == nil || err == ErrFileClosed {
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err = ErrPipeListenerClosed
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}
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}
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return p, err
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}
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func (l *win32PipeListener) listenerRoutine() {
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closed := false
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for !closed {
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select {
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case <-l.closeCh:
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closed = true
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case responseCh := <-l.acceptCh:
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var (
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p *win32File
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err error
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)
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for {
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p, err = l.makeConnectedServerPipe()
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// If the connection was immediately closed by the client, try
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// again.
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if err != windows.ERROR_NO_DATA {
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break
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}
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}
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responseCh <- acceptResponse{p, err}
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closed = err == ErrPipeListenerClosed
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}
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}
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windows.Close(l.firstHandle)
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l.firstHandle = 0
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// Notify Close() and Accept() callers that the handle has been closed.
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close(l.doneCh)
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}
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// PipeConfig contain configuration for the pipe listener.
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type PipeConfig struct {
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// SecurityDescriptor contains a Windows security descriptor.
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SecurityDescriptor *windows.SECURITY_DESCRIPTOR
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// MessageMode determines whether the pipe is in byte or message mode. In either
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// case the pipe is read in byte mode by default. The only practical difference in
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// this implementation is that CloseWrite() is only supported for message mode pipes;
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// CloseWrite() is implemented as a zero-byte write, but zero-byte writes are only
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// transferred to the reader (and returned as io.EOF in this implementation)
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// when the pipe is in message mode.
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MessageMode bool
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// InputBufferSize specifies the size the input buffer, in bytes.
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InputBufferSize int32
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// OutputBufferSize specifies the size the input buffer, in bytes.
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OutputBufferSize int32
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}
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// ListenPipe creates a listener on a Windows named pipe path, e.g. \\.\pipe\mypipe.
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// The pipe must not already exist.
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func ListenPipe(path string, c *PipeConfig) (net.Listener, error) {
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if c == nil {
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c = &PipeConfig{}
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}
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h, err := makeServerPipeHandle(path, c.SecurityDescriptor, c, true)
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if err != nil {
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return nil, err
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}
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l := &win32PipeListener{
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firstHandle: h,
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path: path,
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config: *c,
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acceptCh: make(chan (chan acceptResponse)),
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closeCh: make(chan int),
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doneCh: make(chan int),
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}
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go l.listenerRoutine()
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return l, nil
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}
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func connectPipe(p *win32File) error {
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c, err := p.prepareIo()
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if err != nil {
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return err
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}
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defer p.wg.Done()
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err = connectNamedPipe(p.handle, &c.o)
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_, err = p.asyncIo(c, nil, 0, err)
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if err != nil && err != windows.ERROR_PIPE_CONNECTED {
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return err
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}
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return nil
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}
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func (l *win32PipeListener) Accept() (net.Conn, error) {
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ch := make(chan acceptResponse)
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select {
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case l.acceptCh <- ch:
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response := <-ch
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err := response.err
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if err != nil {
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return nil, err
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}
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if l.config.MessageMode {
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return &win32MessageBytePipe{
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win32Pipe: win32Pipe{win32File: response.f, path: l.path},
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}, nil
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}
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return &win32Pipe{win32File: response.f, path: l.path}, nil
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case <-l.doneCh:
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return nil, ErrPipeListenerClosed
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}
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}
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func (l *win32PipeListener) Close() error {
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select {
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case l.closeCh <- 1:
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<-l.doneCh
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case <-l.doneCh:
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}
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return nil
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}
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func (l *win32PipeListener) Addr() net.Addr {
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return pipeAddress(l.path)
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}
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