diff options
Diffstat (limited to 'rpc/ipc_windows.go')
| -rw-r--r-- | rpc/ipc_windows.go | 626 |
1 files changed, 4 insertions, 622 deletions
diff --git a/rpc/ipc_windows.go b/rpc/ipc_windows.go index 1d4672ad2..c5f69589e 100644 --- a/rpc/ipc_windows.go +++ b/rpc/ipc_windows.go @@ -19,637 +19,19 @@ package rpc import ( - "fmt" - "io" "net" - "sync" - "syscall" "time" - "unsafe" -) - -var ( - modkernel32 = syscall.NewLazyDLL("kernel32.dll") - procCreateNamedPipeW = modkernel32.NewProc("CreateNamedPipeW") - procConnectNamedPipe = modkernel32.NewProc("ConnectNamedPipe") - procDisconnectNamedPipe = modkernel32.NewProc("DisconnectNamedPipe") - procWaitNamedPipeW = modkernel32.NewProc("WaitNamedPipeW") - procCreateEventW = modkernel32.NewProc("CreateEventW") - procGetOverlappedResult = modkernel32.NewProc("GetOverlappedResult") - procCancelIoEx = modkernel32.NewProc("CancelIoEx") + "github.com/microsoft/go-winio" ) -func createNamedPipe(name *uint16, openMode uint32, pipeMode uint32, maxInstances uint32, outBufSize uint32, inBufSize uint32, defaultTimeout uint32, sa *syscall.SecurityAttributes) (handle syscall.Handle, err error) { - r0, _, e1 := syscall.Syscall9(procCreateNamedPipeW.Addr(), 8, uintptr(unsafe.Pointer(name)), uintptr(openMode), uintptr(pipeMode), uintptr(maxInstances), uintptr(outBufSize), uintptr(inBufSize), uintptr(defaultTimeout), uintptr(unsafe.Pointer(sa)), 0) - handle = syscall.Handle(r0) - if handle == syscall.InvalidHandle { - if e1 != 0 { - err = error(e1) - } else { - err = syscall.EINVAL - } - } - return -} - -func cancelIoEx(handle syscall.Handle, overlapped *syscall.Overlapped) (err error) { - r1, _, e1 := syscall.Syscall(procCancelIoEx.Addr(), 2, uintptr(handle), uintptr(unsafe.Pointer(overlapped)), 0) - if r1 == 0 { - if e1 != 0 { - err = error(e1) - } else { - err = syscall.EINVAL - } - } - return -} - -func connectNamedPipe(handle syscall.Handle, overlapped *syscall.Overlapped) (err error) { - r1, _, e1 := syscall.Syscall(procConnectNamedPipe.Addr(), 2, uintptr(handle), uintptr(unsafe.Pointer(overlapped)), 0) - if r1 == 0 { - if e1 != 0 { - err = error(e1) - } else { - err = syscall.EINVAL - } - } - return -} - -func disconnectNamedPipe(handle syscall.Handle) (err error) { - r1, _, e1 := syscall.Syscall(procDisconnectNamedPipe.Addr(), 1, uintptr(handle), 0, 0) - if r1 == 0 { - if e1 != 0 { - err = error(e1) - } else { - err = syscall.EINVAL - } - } - return -} - -func waitNamedPipe(name *uint16, timeout uint32) (err error) { - r1, _, e1 := syscall.Syscall(procWaitNamedPipeW.Addr(), 2, uintptr(unsafe.Pointer(name)), uintptr(timeout), 0) - if r1 == 0 { - if e1 != 0 { - err = error(e1) - } else { - err = syscall.EINVAL - } - } - return -} - -func createEvent(sa *syscall.SecurityAttributes, manualReset bool, initialState bool, name *uint16) (handle syscall.Handle, err error) { - var _p0 uint32 - if manualReset { - _p0 = 1 - } else { - _p0 = 0 - } - var _p1 uint32 - if initialState { - _p1 = 1 - } else { - _p1 = 0 - } - r0, _, e1 := syscall.Syscall6(procCreateEventW.Addr(), 4, uintptr(unsafe.Pointer(sa)), uintptr(_p0), uintptr(_p1), uintptr(unsafe.Pointer(name)), 0, 0) - handle = syscall.Handle(r0) - if handle == syscall.InvalidHandle { - if e1 != 0 { - err = error(e1) - } else { - err = syscall.EINVAL - } - } - return -} - -func getOverlappedResult(handle syscall.Handle, overlapped *syscall.Overlapped, transferred *uint32, wait bool) (err error) { - var _p0 uint32 - if wait { - _p0 = 1 - } else { - _p0 = 0 - } - r1, _, e1 := syscall.Syscall6(procGetOverlappedResult.Addr(), 4, uintptr(handle), uintptr(unsafe.Pointer(overlapped)), uintptr(unsafe.Pointer(transferred)), uintptr(_p0), 0, 0) - if r1 == 0 { - if e1 != 0 { - err = error(e1) - } else { - err = syscall.EINVAL - } - } - return -} - -const ( - // openMode - pipe_access_duplex = 0x3 - pipe_access_inbound = 0x1 - pipe_access_outbound = 0x2 - - // openMode write flags - file_flag_first_pipe_instance = 0x00080000 - file_flag_write_through = 0x80000000 - file_flag_overlapped = 0x40000000 - - // openMode ACL flags - write_dac = 0x00040000 - write_owner = 0x00080000 - access_system_security = 0x01000000 - - // pipeMode - pipe_type_byte = 0x0 - pipe_type_message = 0x4 - - // pipeMode read mode flags - pipe_readmode_byte = 0x0 - pipe_readmode_message = 0x2 - - // pipeMode wait mode flags - pipe_wait = 0x0 - pipe_nowait = 0x1 - - // pipeMode remote-client mode flags - pipe_accept_remote_clients = 0x0 - pipe_reject_remote_clients = 0x8 - - pipe_unlimited_instances = 255 - - nmpwait_wait_forever = 0xFFFFFFFF - - // the two not-an-errors below occur if a client connects to the pipe between - // the server's CreateNamedPipe and ConnectNamedPipe calls. - error_no_data syscall.Errno = 0xE8 - error_pipe_connected syscall.Errno = 0x217 - error_pipe_busy syscall.Errno = 0xE7 - error_sem_timeout syscall.Errno = 0x79 - - error_bad_pathname syscall.Errno = 0xA1 - error_invalid_name syscall.Errno = 0x7B - - error_io_incomplete syscall.Errno = 0x3e4 -) - -var _ net.Conn = (*PipeConn)(nil) -var _ net.Listener = (*PipeListener)(nil) - -// ErrClosed is the error returned by PipeListener.Accept when Close is called -// on the PipeListener. -var ErrClosed = PipeError{"Pipe has been closed.", false} - -// PipeError is an error related to a call to a pipe -type PipeError struct { - msg string - timeout bool -} - -// Error implements the error interface -func (e PipeError) Error() string { - return e.msg -} - -// Timeout implements net.AddrError.Timeout() -func (e PipeError) Timeout() bool { - return e.timeout -} - -// Temporary implements net.AddrError.Temporary() -func (e PipeError) Temporary() bool { - return false -} - -// Dial connects to a named pipe with the given address. If the specified pipe is not available, -// it will wait indefinitely for the pipe to become available. -// -// The address must be of the form \\.\\pipe\<name> for local pipes and \\<computer>\pipe\<name> -// for remote pipes. -// -// Dial will return a PipeError if you pass in a badly formatted pipe name. -// -// Examples: -// // local pipe -// conn, err := Dial(`\\.\pipe\mypipename`) -// -// // remote pipe -// conn, err := Dial(`\\othercomp\pipe\mypipename`) -func Dial(address string) (*PipeConn, error) { - for { - conn, err := dial(address, nmpwait_wait_forever) - if err == nil { - return conn, nil - } - if isPipeNotReady(err) { - <-time.After(100 * time.Millisecond) - continue - } - return nil, err - } -} - -// DialTimeout acts like Dial, but will time out after the duration of timeout -func DialTimeout(address string, timeout time.Duration) (*PipeConn, error) { - deadline := time.Now().Add(timeout) - - now := time.Now() - for now.Before(deadline) { - millis := uint32(deadline.Sub(now) / time.Millisecond) - conn, err := dial(address, millis) - if err == nil { - return conn, nil - } - if err == error_sem_timeout { - // This is WaitNamedPipe's timeout error, so we know we're done - return nil, PipeError{fmt.Sprintf( - "Timed out waiting for pipe '%s' to come available", address), true} - } - if isPipeNotReady(err) { - left := deadline.Sub(time.Now()) - retry := 100 * time.Millisecond - if left > retry { - <-time.After(retry) - } else { - <-time.After(left - time.Millisecond) - } - now = time.Now() - continue - } - return nil, err - } - return nil, PipeError{fmt.Sprintf( - "Timed out waiting for pipe '%s' to come available", address), true} -} - -// isPipeNotReady checks the error to see if it indicates the pipe is not ready -func isPipeNotReady(err error) bool { - // Pipe Busy means another client just grabbed the open pipe end, - // and the server hasn't made a new one yet. - // File Not Found means the server hasn't created the pipe yet. - // Neither is a fatal error. - - return err == syscall.ERROR_FILE_NOT_FOUND || err == error_pipe_busy -} - -// newOverlapped creates a structure used to track asynchronous -// I/O requests that have been issued. -func newOverlapped() (*syscall.Overlapped, error) { - event, err := createEvent(nil, true, true, nil) - if err != nil { - return nil, err - } - return &syscall.Overlapped{HEvent: event}, nil -} - -// waitForCompletion waits for an asynchronous I/O request referred to by overlapped to complete. -// This function returns the number of bytes transferred by the operation and an error code if -// applicable (nil otherwise). -func waitForCompletion(handle syscall.Handle, overlapped *syscall.Overlapped) (uint32, error) { - _, err := syscall.WaitForSingleObject(overlapped.HEvent, syscall.INFINITE) - if err != nil { - return 0, err - } - var transferred uint32 - err = getOverlappedResult(handle, overlapped, &transferred, true) - return transferred, err -} - -// dial is a helper to initiate a connection to a named pipe that has been started by a server. -// The timeout is only enforced if the pipe server has already created the pipe, otherwise -// this function will return immediately. -func dial(address string, timeout uint32) (*PipeConn, error) { - name, err := syscall.UTF16PtrFromString(string(address)) - if err != nil { - return nil, err - } - // If at least one instance of the pipe has been created, this function - // will wait timeout milliseconds for it to become available. - // It will return immediately regardless of timeout, if no instances - // of the named pipe have been created yet. - // If this returns with no error, there is a pipe available. - if err := waitNamedPipe(name, timeout); err != nil { - if err == error_bad_pathname { - // badly formatted pipe name - return nil, badAddr(address) - } - return nil, err - } - pathp, err := syscall.UTF16PtrFromString(address) - if err != nil { - return nil, err - } - handle, err := syscall.CreateFile(pathp, syscall.GENERIC_READ|syscall.GENERIC_WRITE, - uint32(syscall.FILE_SHARE_READ|syscall.FILE_SHARE_WRITE), nil, syscall.OPEN_EXISTING, - syscall.FILE_FLAG_OVERLAPPED, 0) - if err != nil { - return nil, err - } - return &PipeConn{handle: handle, addr: PipeAddr(address)}, nil -} - -// Listen returns a new PipeListener that will listen on a pipe with the given -// address. The address must be of the form \\.\pipe\<name> -// -// Listen will return a PipeError for an incorrectly formatted pipe name. -func Listen(address string) (*PipeListener, error) { - handle, err := createPipe(address, true) - if err == error_invalid_name { - return nil, badAddr(address) - } - if err != nil { - return nil, err - } - return &PipeListener{ - addr: PipeAddr(address), - handle: handle, - }, nil -} - -// PipeListener is a named pipe listener. Clients should typically -// use variables of type net.Listener instead of assuming named pipe. -type PipeListener struct { - addr PipeAddr - handle syscall.Handle - closed bool - - // acceptHandle contains the current handle waiting for - // an incoming connection or nil. - acceptHandle syscall.Handle - // acceptOverlapped is set before waiting on a connection. - // If not waiting, it is nil. - acceptOverlapped *syscall.Overlapped - // acceptMutex protects the handle and overlapped structure. - acceptMutex sync.Mutex -} - -// Accept implements the Accept method in the net.Listener interface; it -// waits for the next call and returns a generic net.Conn. -func (l *PipeListener) Accept() (net.Conn, error) { - c, err := l.AcceptPipe() - for err == error_no_data { - // Ignore clients that connect and immediately disconnect. - c, err = l.AcceptPipe() - } - if err != nil { - return nil, err - } - return c, nil -} - -// AcceptPipe accepts the next incoming call and returns the new connection. -// It might return an error if a client connected and immediately cancelled -// the connection. -func (l *PipeListener) AcceptPipe() (*PipeConn, error) { - if l == nil || l.addr == "" || l.closed { - return nil, syscall.EINVAL - } - - // the first time we call accept, the handle will have been created by the Listen - // call. This is to prevent race conditions where the client thinks the server - // isn't listening because it hasn't actually called create yet. After the first time, we'll - // have to create a new handle each time - handle := l.handle - if handle == 0 { - var err error - handle, err = createPipe(string(l.addr), false) - if err != nil { - return nil, err - } - } else { - l.handle = 0 - } - - overlapped, err := newOverlapped() - if err != nil { - return nil, err - } - defer syscall.CloseHandle(overlapped.HEvent) - if err := connectNamedPipe(handle, overlapped); err != nil && err != error_pipe_connected { - if err == error_io_incomplete || err == syscall.ERROR_IO_PENDING { - l.acceptMutex.Lock() - l.acceptOverlapped = overlapped - l.acceptHandle = handle - l.acceptMutex.Unlock() - defer func() { - l.acceptMutex.Lock() - l.acceptOverlapped = nil - l.acceptHandle = 0 - l.acceptMutex.Unlock() - }() - - _, err = waitForCompletion(handle, overlapped) - } - if err == syscall.ERROR_OPERATION_ABORTED { - // Return error compatible to net.Listener.Accept() in case the - // listener was closed. - return nil, ErrClosed - } - if err != nil { - return nil, err - } - } - return &PipeConn{handle: handle, addr: l.addr}, nil -} - -// Close stops listening on the address. -// Already Accepted connections are not closed. -func (l *PipeListener) Close() error { - if l.closed { - return nil - } - l.closed = true - if l.handle != 0 { - err := disconnectNamedPipe(l.handle) - if err != nil { - return err - } - err = syscall.CloseHandle(l.handle) - if err != nil { - return err - } - l.handle = 0 - } - l.acceptMutex.Lock() - defer l.acceptMutex.Unlock() - if l.acceptOverlapped != nil && l.acceptHandle != 0 { - // Cancel the pending IO. This call does not block, so it is safe - // to hold onto the mutex above. - if err := cancelIoEx(l.acceptHandle, l.acceptOverlapped); err != nil { - return err - } - err := syscall.CloseHandle(l.acceptOverlapped.HEvent) - if err != nil { - return err - } - l.acceptOverlapped.HEvent = 0 - err = syscall.CloseHandle(l.acceptHandle) - if err != nil { - return err - } - l.acceptHandle = 0 - } - return nil -} - -// Addr returns the listener's network address, a PipeAddr. -func (l *PipeListener) Addr() net.Addr { return l.addr } - -// PipeConn is the implementation of the net.Conn interface for named pipe connections. -type PipeConn struct { - handle syscall.Handle - addr PipeAddr - - // these aren't actually used yet - readDeadline *time.Time - writeDeadline *time.Time -} - -type iodata struct { - n uint32 - err error -} - -// completeRequest looks at iodata to see if a request is pending. If so, it waits for it to either complete or to -// abort due to hitting the specified deadline. Deadline may be set to nil to wait forever. If no request is pending, -// the content of iodata is returned. -func (c *PipeConn) completeRequest(data iodata, deadline *time.Time, overlapped *syscall.Overlapped) (int, error) { - if data.err == error_io_incomplete || data.err == syscall.ERROR_IO_PENDING { - var timer <-chan time.Time - if deadline != nil { - if timeDiff := deadline.Sub(time.Now()); timeDiff > 0 { - timer = time.After(timeDiff) - } - } - done := make(chan iodata) - go func() { - n, err := waitForCompletion(c.handle, overlapped) - done <- iodata{n, err} - }() - select { - case data = <-done: - case <-timer: - syscall.CancelIoEx(c.handle, overlapped) - data = iodata{0, timeout(c.addr.String())} - } - } - // Windows will produce ERROR_BROKEN_PIPE upon closing - // a handle on the other end of a connection. Go RPC - // expects an io.EOF error in this case. - if data.err == syscall.ERROR_BROKEN_PIPE { - data.err = io.EOF - } - return int(data.n), data.err -} - -// Read implements the net.Conn Read method. -func (c *PipeConn) Read(b []byte) (int, error) { - // Use ReadFile() rather than Read() because the latter - // contains a workaround that eats ERROR_BROKEN_PIPE. - overlapped, err := newOverlapped() - if err != nil { - return 0, err - } - defer syscall.CloseHandle(overlapped.HEvent) - var n uint32 - err = syscall.ReadFile(c.handle, b, &n, overlapped) - return c.completeRequest(iodata{n, err}, c.readDeadline, overlapped) -} - -// Write implements the net.Conn Write method. -func (c *PipeConn) Write(b []byte) (int, error) { - overlapped, err := newOverlapped() - if err != nil { - return 0, err - } - defer syscall.CloseHandle(overlapped.HEvent) - var n uint32 - err = syscall.WriteFile(c.handle, b, &n, overlapped) - return c.completeRequest(iodata{n, err}, c.writeDeadline, overlapped) -} - -// Close closes the connection. -func (c *PipeConn) Close() error { - return syscall.CloseHandle(c.handle) -} - -// LocalAddr returns the local network address. -func (c *PipeConn) LocalAddr() net.Addr { - return c.addr -} - -// RemoteAddr returns the remote network address. -func (c *PipeConn) RemoteAddr() net.Addr { - // not sure what to do here, we don't have remote addr.... - return c.addr -} - -// SetDeadline implements the net.Conn SetDeadline method. -// Note that timeouts are only supported on Windows Vista/Server 2008 and above -func (c *PipeConn) SetDeadline(t time.Time) error { - c.SetReadDeadline(t) - c.SetWriteDeadline(t) - return nil -} - -// SetReadDeadline implements the net.Conn SetReadDeadline method. -// Note that timeouts are only supported on Windows Vista/Server 2008 and above -func (c *PipeConn) SetReadDeadline(t time.Time) error { - c.readDeadline = &t - return nil -} - -// SetWriteDeadline implements the net.Conn SetWriteDeadline method. -// Note that timeouts are only supported on Windows Vista/Server 2008 and above -func (c *PipeConn) SetWriteDeadline(t time.Time) error { - c.writeDeadline = &t - return nil -} - -// PipeAddr represents the address of a named pipe. -type PipeAddr string - -// Network returns the address's network name, "pipe". -func (a PipeAddr) Network() string { return "pipe" } - -// String returns the address of the pipe -func (a PipeAddr) String() string { - return string(a) -} - -// createPipe is a helper function to make sure we always create pipes -// with the same arguments, since subsequent calls to create pipe need -// to use the same arguments as the first one. If first is set, fail -// if the pipe already exists. -func createPipe(address string, first bool) (syscall.Handle, error) { - n, err := syscall.UTF16PtrFromString(address) - if err != nil { - return 0, err - } - mode := uint32(pipe_access_duplex | syscall.FILE_FLAG_OVERLAPPED) - if first { - mode |= file_flag_first_pipe_instance - } - return createNamedPipe(n, - mode, - pipe_type_byte, - pipe_unlimited_instances, - 512, 512, 0, nil) -} - -func badAddr(addr string) PipeError { - return PipeError{fmt.Sprintf("Invalid pipe address '%s'.", addr), false} -} -func timeout(addr string) PipeError { - return PipeError{fmt.Sprintf("Pipe IO timed out waiting for '%s'", addr), true} -} - // ipcListen will create a named pipe on the given endpoint. func ipcListen(endpoint string) (net.Listener, error) { - return Listen(endpoint) + return winio.ListenPipe(endpoint, &winio.PipeConfig{}) } // newIPCConnection will connect to a named pipe with the given endpoint as name. func newIPCConnection(endpoint string) (net.Conn, error) { - return Dial(endpoint) + timeout := 5 * time.Second + return winio.DialPipe(endpoint, &timeout) } |