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308 lines
7.4 KiB
Go
308 lines
7.4 KiB
Go
// +build windows
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package winio
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import (
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"fmt"
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"io"
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"net"
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"os"
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"syscall"
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"time"
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"unsafe"
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"github.com/Microsoft/go-winio/pkg/guid"
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)
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//sys bind(s syscall.Handle, name unsafe.Pointer, namelen int32) (err error) [failretval==socketError] = ws2_32.bind
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const (
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afHvSock = 34 // AF_HYPERV
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socketError = ^uintptr(0)
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)
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// An HvsockAddr is an address for a AF_HYPERV socket.
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type HvsockAddr struct {
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VMID guid.GUID
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ServiceID guid.GUID
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}
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type rawHvsockAddr struct {
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Family uint16
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_ uint16
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VMID guid.GUID
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ServiceID guid.GUID
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}
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// Network returns the address's network name, "hvsock".
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func (addr *HvsockAddr) Network() string {
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return "hvsock"
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}
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func (addr *HvsockAddr) String() string {
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return fmt.Sprintf("%s:%s", &addr.VMID, &addr.ServiceID)
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}
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// VsockServiceID returns an hvsock service ID corresponding to the specified AF_VSOCK port.
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func VsockServiceID(port uint32) guid.GUID {
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g, _ := guid.FromString("00000000-facb-11e6-bd58-64006a7986d3")
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g.Data1 = port
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return g
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}
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func (addr *HvsockAddr) raw() rawHvsockAddr {
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return rawHvsockAddr{
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Family: afHvSock,
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VMID: addr.VMID,
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ServiceID: addr.ServiceID,
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}
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}
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func (addr *HvsockAddr) fromRaw(raw *rawHvsockAddr) {
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addr.VMID = raw.VMID
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addr.ServiceID = raw.ServiceID
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}
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// HvsockListener is a socket listener for the AF_HYPERV address family.
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type HvsockListener struct {
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sock *win32File
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addr HvsockAddr
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}
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// HvsockConn is a connected socket of the AF_HYPERV address family.
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type HvsockConn struct {
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sock *win32File
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local, remote HvsockAddr
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}
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func newHvSocket() (*win32File, error) {
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fd, err := syscall.Socket(afHvSock, syscall.SOCK_STREAM, 1)
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if err != nil {
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return nil, os.NewSyscallError("socket", err)
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}
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f, err := makeWin32File(fd)
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if err != nil {
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syscall.Close(fd)
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return nil, err
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}
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f.socket = true
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return f, nil
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}
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// ListenHvsock listens for connections on the specified hvsock address.
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func ListenHvsock(addr *HvsockAddr) (_ *HvsockListener, err error) {
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l := &HvsockListener{addr: *addr}
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sock, err := newHvSocket()
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if err != nil {
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return nil, l.opErr("listen", err)
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}
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sa := addr.raw()
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err = bind(sock.handle, unsafe.Pointer(&sa), int32(unsafe.Sizeof(sa)))
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if err != nil {
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return nil, l.opErr("listen", os.NewSyscallError("socket", err))
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}
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err = syscall.Listen(sock.handle, 16)
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if err != nil {
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return nil, l.opErr("listen", os.NewSyscallError("listen", err))
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}
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return &HvsockListener{sock: sock, addr: *addr}, nil
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}
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func (l *HvsockListener) opErr(op string, err error) error {
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return &net.OpError{Op: op, Net: "hvsock", Addr: &l.addr, Err: err}
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}
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// Addr returns the listener's network address.
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func (l *HvsockListener) Addr() net.Addr {
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return &l.addr
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}
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// Accept waits for the next connection and returns it.
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func (l *HvsockListener) Accept() (_ net.Conn, err error) {
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sock, err := newHvSocket()
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if err != nil {
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return nil, l.opErr("accept", err)
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}
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defer func() {
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if sock != nil {
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sock.Close()
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}
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}()
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c, err := l.sock.prepareIo()
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if err != nil {
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return nil, l.opErr("accept", err)
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}
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defer l.sock.wg.Done()
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// AcceptEx, per documentation, requires an extra 16 bytes per address.
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const addrlen = uint32(16 + unsafe.Sizeof(rawHvsockAddr{}))
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var addrbuf [addrlen * 2]byte
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var bytes uint32
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err = syscall.AcceptEx(l.sock.handle, sock.handle, &addrbuf[0], 0, addrlen, addrlen, &bytes, &c.o)
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_, err = l.sock.asyncIo(c, nil, bytes, err)
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if err != nil {
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return nil, l.opErr("accept", os.NewSyscallError("acceptex", err))
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}
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conn := &HvsockConn{
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sock: sock,
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}
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conn.local.fromRaw((*rawHvsockAddr)(unsafe.Pointer(&addrbuf[0])))
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conn.remote.fromRaw((*rawHvsockAddr)(unsafe.Pointer(&addrbuf[addrlen])))
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sock = nil
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return conn, nil
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}
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// Close closes the listener, causing any pending Accept calls to fail.
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func (l *HvsockListener) Close() error {
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return l.sock.Close()
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}
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/* Need to finish ConnectEx handling
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func DialHvsock(ctx context.Context, addr *HvsockAddr) (*HvsockConn, error) {
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sock, err := newHvSocket()
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if err != nil {
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return nil, err
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}
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defer func() {
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if sock != nil {
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sock.Close()
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}
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}()
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c, err := sock.prepareIo()
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if err != nil {
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return nil, err
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}
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defer sock.wg.Done()
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var bytes uint32
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err = windows.ConnectEx(windows.Handle(sock.handle), sa, nil, 0, &bytes, &c.o)
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_, err = sock.asyncIo(ctx, c, nil, bytes, err)
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if err != nil {
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return nil, err
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}
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conn := &HvsockConn{
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sock: sock,
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remote: *addr,
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}
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sock = nil
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return conn, nil
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}
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*/
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func (conn *HvsockConn) opErr(op string, err error) error {
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return &net.OpError{Op: op, Net: "hvsock", Source: &conn.local, Addr: &conn.remote, Err: err}
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}
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func (conn *HvsockConn) Read(b []byte) (int, error) {
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c, err := conn.sock.prepareIo()
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if err != nil {
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return 0, conn.opErr("read", err)
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}
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defer conn.sock.wg.Done()
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buf := syscall.WSABuf{Buf: &b[0], Len: uint32(len(b))}
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var flags, bytes uint32
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err = syscall.WSARecv(conn.sock.handle, &buf, 1, &bytes, &flags, &c.o, nil)
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n, err := conn.sock.asyncIo(c, &conn.sock.readDeadline, bytes, err)
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if err != nil {
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if _, ok := err.(syscall.Errno); ok {
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err = os.NewSyscallError("wsarecv", err)
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}
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return 0, conn.opErr("read", err)
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} else if n == 0 {
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err = io.EOF
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}
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return n, err
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}
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func (conn *HvsockConn) Write(b []byte) (int, error) {
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t := 0
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for len(b) != 0 {
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n, err := conn.write(b)
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if err != nil {
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return t + n, err
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}
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t += n
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b = b[n:]
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}
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return t, nil
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}
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func (conn *HvsockConn) write(b []byte) (int, error) {
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c, err := conn.sock.prepareIo()
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if err != nil {
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return 0, conn.opErr("write", err)
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}
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defer conn.sock.wg.Done()
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buf := syscall.WSABuf{Buf: &b[0], Len: uint32(len(b))}
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var bytes uint32
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err = syscall.WSASend(conn.sock.handle, &buf, 1, &bytes, 0, &c.o, nil)
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n, err := conn.sock.asyncIo(c, &conn.sock.writeDeadline, bytes, err)
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if err != nil {
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if _, ok := err.(syscall.Errno); ok {
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err = os.NewSyscallError("wsasend", err)
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}
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return 0, conn.opErr("write", err)
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}
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return n, err
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}
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// Close closes the socket connection, failing any pending read or write calls.
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func (conn *HvsockConn) Close() error {
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return conn.sock.Close()
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}
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func (conn *HvsockConn) shutdown(how int) error {
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err := syscall.Shutdown(conn.sock.handle, syscall.SHUT_RD)
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if err != nil {
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return os.NewSyscallError("shutdown", err)
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}
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return nil
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}
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// CloseRead shuts down the read end of the socket.
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func (conn *HvsockConn) CloseRead() error {
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err := conn.shutdown(syscall.SHUT_RD)
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if err != nil {
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return conn.opErr("close", err)
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}
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return nil
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}
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// CloseWrite shuts down the write end of the socket, notifying the other endpoint that
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// no more data will be written.
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func (conn *HvsockConn) CloseWrite() error {
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err := conn.shutdown(syscall.SHUT_WR)
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if err != nil {
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return conn.opErr("close", err)
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}
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return nil
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}
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// LocalAddr returns the local address of the connection.
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func (conn *HvsockConn) LocalAddr() net.Addr {
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return &conn.local
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}
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// RemoteAddr returns the remote address of the connection.
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func (conn *HvsockConn) RemoteAddr() net.Addr {
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return &conn.remote
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}
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// SetDeadline implements the net.Conn SetDeadline method.
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func (conn *HvsockConn) SetDeadline(t time.Time) error {
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conn.SetReadDeadline(t)
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conn.SetWriteDeadline(t)
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return nil
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}
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// SetReadDeadline implements the net.Conn SetReadDeadline method.
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func (conn *HvsockConn) SetReadDeadline(t time.Time) error {
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return conn.sock.SetReadDeadline(t)
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}
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// SetWriteDeadline implements the net.Conn SetWriteDeadline method.
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func (conn *HvsockConn) SetWriteDeadline(t time.Time) error {
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return conn.sock.SetWriteDeadline(t)
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}
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