mirror of https://github.com/hashicorp/consul
405 lines
11 KiB
Go
405 lines
11 KiB
Go
// +build windows
|
|
|
|
package winio
|
|
|
|
import (
|
|
"errors"
|
|
"io"
|
|
"net"
|
|
"os"
|
|
"syscall"
|
|
"time"
|
|
"unsafe"
|
|
)
|
|
|
|
//sys connectNamedPipe(pipe syscall.Handle, o *syscall.Overlapped) (err error) = ConnectNamedPipe
|
|
//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
|
|
//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
|
|
//sys waitNamedPipe(name string, timeout uint32) (err error) = WaitNamedPipeW
|
|
//sys getNamedPipeInfo(pipe syscall.Handle, flags *uint32, outSize *uint32, inSize *uint32, maxInstances *uint32) (err error) = GetNamedPipeInfo
|
|
//sys getNamedPipeHandleState(pipe syscall.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
|
|
|
|
const (
|
|
cERROR_PIPE_BUSY = syscall.Errno(231)
|
|
cERROR_PIPE_CONNECTED = syscall.Errno(535)
|
|
cERROR_SEM_TIMEOUT = syscall.Errno(121)
|
|
|
|
cPIPE_ACCESS_DUPLEX = 0x3
|
|
cFILE_FLAG_FIRST_PIPE_INSTANCE = 0x80000
|
|
cSECURITY_SQOS_PRESENT = 0x100000
|
|
cSECURITY_ANONYMOUS = 0
|
|
|
|
cPIPE_REJECT_REMOTE_CLIENTS = 0x8
|
|
|
|
cPIPE_UNLIMITED_INSTANCES = 255
|
|
|
|
cNMPWAIT_USE_DEFAULT_WAIT = 0
|
|
cNMPWAIT_NOWAIT = 1
|
|
|
|
cPIPE_TYPE_MESSAGE = 4
|
|
|
|
cPIPE_READMODE_MESSAGE = 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
|
|
}
|
|
return n, err
|
|
}
|
|
|
|
func (s pipeAddress) Network() string {
|
|
return "pipe"
|
|
}
|
|
|
|
func (s pipeAddress) String() string {
|
|
return string(s)
|
|
}
|
|
|
|
// DialPipe connects to a named pipe by path, timing out if the connection
|
|
// takes longer than the specified duration. If timeout is nil, then the timeout
|
|
// is the default timeout established by the pipe server.
|
|
func DialPipe(path string, timeout *time.Duration) (net.Conn, error) {
|
|
var absTimeout time.Time
|
|
if timeout != nil {
|
|
absTimeout = time.Now().Add(*timeout)
|
|
}
|
|
var err error
|
|
var h syscall.Handle
|
|
for {
|
|
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)
|
|
if err != cERROR_PIPE_BUSY {
|
|
break
|
|
}
|
|
now := time.Now()
|
|
var ms uint32
|
|
if absTimeout.IsZero() {
|
|
ms = cNMPWAIT_USE_DEFAULT_WAIT
|
|
} else if now.After(absTimeout) {
|
|
ms = cNMPWAIT_NOWAIT
|
|
} else {
|
|
ms = uint32(absTimeout.Sub(now).Nanoseconds() / 1000 / 1000)
|
|
}
|
|
err = waitNamedPipe(path, ms)
|
|
if err != nil {
|
|
if err == cERROR_SEM_TIMEOUT {
|
|
return nil, ErrTimeout
|
|
}
|
|
break
|
|
}
|
|
}
|
|
if err != nil {
|
|
return nil, &os.PathError{Op: "open", Path: path, Err: err}
|
|
}
|
|
|
|
var flags uint32
|
|
err = getNamedPipeInfo(h, &flags, nil, nil, nil)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
var state uint32
|
|
err = getNamedPipeHandleState(h, &state, nil, nil, nil, nil, 0)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
if state&cPIPE_READMODE_MESSAGE != 0 {
|
|
return nil, &os.PathError{Op: "open", Path: path, Err: errors.New("message readmode pipes not supported")}
|
|
}
|
|
|
|
f, err := makeWin32File(h)
|
|
if err != nil {
|
|
syscall.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 syscall.Handle
|
|
path string
|
|
securityDescriptor []byte
|
|
config PipeConfig
|
|
acceptCh chan (chan acceptResponse)
|
|
closeCh chan int
|
|
doneCh chan int
|
|
}
|
|
|
|
func makeServerPipeHandle(path string, securityDescriptor []byte, c *PipeConfig, first bool) (syscall.Handle, error) {
|
|
var flags uint32 = cPIPE_ACCESS_DUPLEX | syscall.FILE_FLAG_OVERLAPPED
|
|
if first {
|
|
flags |= cFILE_FLAG_FIRST_PIPE_INSTANCE
|
|
}
|
|
|
|
var mode uint32 = cPIPE_REJECT_REMOTE_CLIENTS
|
|
if c.MessageMode {
|
|
mode |= cPIPE_TYPE_MESSAGE
|
|
}
|
|
|
|
sa := &syscall.SecurityAttributes{}
|
|
sa.Length = uint32(unsafe.Sizeof(*sa))
|
|
if securityDescriptor != nil {
|
|
len := uint32(len(securityDescriptor))
|
|
sa.SecurityDescriptor = localAlloc(0, len)
|
|
defer localFree(sa.SecurityDescriptor)
|
|
copy((*[0xffff]byte)(unsafe.Pointer(sa.SecurityDescriptor))[:], securityDescriptor)
|
|
}
|
|
h, err := createNamedPipe(path, flags, mode, cPIPE_UNLIMITED_INSTANCES, uint32(c.OutputBufferSize), uint32(c.InputBufferSize), 0, sa)
|
|
if err != nil {
|
|
return 0, &os.PathError{Op: "open", Path: path, Err: err}
|
|
}
|
|
return h, nil
|
|
}
|
|
|
|
func (l *win32PipeListener) makeServerPipe() (*win32File, error) {
|
|
h, err := makeServerPipeHandle(l.path, l.securityDescriptor, &l.config, false)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
f, err := makeWin32File(h)
|
|
if err != nil {
|
|
syscall.Close(h)
|
|
return nil, err
|
|
}
|
|
return f, nil
|
|
}
|
|
|
|
func (l *win32PipeListener) listenerRoutine() {
|
|
closed := false
|
|
for !closed {
|
|
select {
|
|
case <-l.closeCh:
|
|
closed = true
|
|
case responseCh := <-l.acceptCh:
|
|
p, err := l.makeServerPipe()
|
|
if err == nil {
|
|
// Wait for the client to connect.
|
|
ch := make(chan error)
|
|
go func() {
|
|
ch <- connectPipe(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
|
|
}
|
|
closed = true
|
|
}
|
|
}
|
|
responseCh <- acceptResponse{p, err}
|
|
}
|
|
}
|
|
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
|
|
}
|
|
// Immediately open and then close a client handle so that the named pipe is
|
|
// created but not currently accepting connections.
|
|
h2, err := createFile(path, 0, 0, nil, syscall.OPEN_EXISTING, cSECURITY_SQOS_PRESENT|cSECURITY_ANONYMOUS, 0)
|
|
if err != nil {
|
|
syscall.Close(h)
|
|
return nil, err
|
|
}
|
|
syscall.Close(h2)
|
|
l := &win32PipeListener{
|
|
firstHandle: h,
|
|
path: path,
|
|
securityDescriptor: sd,
|
|
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)
|
|
}
|