511 lines
14 KiB
Go
511 lines
14 KiB
Go
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// +build windows
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package winio
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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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"syscall"
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"time"
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"unsafe"
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)
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//sys connectNamedPipe(pipe syscall.Handle, o *syscall.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 *syscall.SecurityAttributes) (handle syscall.Handle, err error) [failretval==syscall.InvalidHandle] = CreateNamedPipeW
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//sys createFile(name string, access uint32, mode uint32, sa *syscall.SecurityAttributes, createmode uint32, attrs uint32, templatefile syscall.Handle) (handle syscall.Handle, err error) [failretval==syscall.InvalidHandle] = CreateFileW
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//sys getNamedPipeInfo(pipe syscall.Handle, flags *uint32, outSize *uint32, inSize *uint32, maxInstances *uint32) (err error) = GetNamedPipeInfo
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//sys getNamedPipeHandleState(pipe syscall.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 *syscall.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 *securityDescriptor
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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 securityDescriptor struct {
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Revision byte
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Sbz1 byte
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Control uint16
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Owner uintptr
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Group uintptr
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Sacl uintptr
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Dacl 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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cERROR_PIPE_BUSY = syscall.Errno(231)
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cERROR_NO_DATA = syscall.Errno(232)
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cERROR_PIPE_CONNECTED = syscall.Errno(535)
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cERROR_SEM_TIMEOUT = syscall.Errno(121)
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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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cSE_DACL_PRESENT = 4
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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 == syscall.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) (syscall.Handle, error) {
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for {
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select {
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case <-ctx.Done():
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return syscall.Handle(0), ctx.Err()
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default:
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h, err := createFile(*path, syscall.GENERIC_READ|syscall.GENERIC_WRITE, 0, nil, syscall.OPEN_EXISTING, syscall.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 != cERROR_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) (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)
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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) (net.Conn, error) {
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var err error
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var h syscall.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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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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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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syscall.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 syscall.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 []byte, c *PipeConfig, first bool) (syscall.Handle, error) {
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path16, err := syscall.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 localFree(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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len := uint32(len(sd))
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sdb := localAlloc(0, len)
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defer localFree(sdb)
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copy((*[0xffff]byte)(unsafe.Pointer(sdb))[:], sd)
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oa.SecurityDescriptor = (*securityDescriptor)(unsafe.Pointer(sdb))
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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 localFree(dacl)
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sdb := &securityDescriptor{
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Revision: 1,
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Control: cSE_DACL_PRESENT,
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Dacl: dacl,
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}
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oa.SecurityDescriptor = sdb
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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(syscall.GENERIC_READ | syscall.GENERIC_WRITE | syscall.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 = syscall.SYNCHRONIZE
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}
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timeout := int64(-50 * 10000) // 50ms
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var (
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h syscall.Handle
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iosb ioStatusBlock
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)
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err = ntCreateNamedPipeFile(&h, access, &oa, &iosb, syscall.FILE_SHARE_READ|syscall.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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syscall.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
|
||
|
|
}
|
||
|
|
}
|
||
|
|
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 != cERROR_NO_DATA {
|
||
|
|
break
|
||
|
|
}
|
||
|
|
}
|
||
|
|
responseCh <- acceptResponse{p, err}
|
||
|
|
closed = err == ErrPipeListenerClosed
|
||
|
|
}
|
||
|
|
}
|
||
|
|
syscall.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 in SDDL format.
|
||
|
|
SecurityDescriptor string
|
||
|
|
|
||
|
|
// 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) {
|
||
|
|
var (
|
||
|
|
sd []byte
|
||
|
|
err error
|
||
|
|
)
|
||
|
|
if c == nil {
|
||
|
|
c = &PipeConfig{}
|
||
|
|
}
|
||
|
|
if c.SecurityDescriptor != "" {
|
||
|
|
sd, err = SddlToSecurityDescriptor(c.SecurityDescriptor)
|
||
|
|
if err != nil {
|
||
|
|
return nil, err
|
||
|
|
}
|
||
|
|
}
|
||
|
|
h, err := makeServerPipeHandle(path, sd, 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 != cERROR_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)
|
||
|
|
}
|