mirror of https://github.com/hashicorp/packer
Matthew Hooker
9 years ago
parent
28ee60d216
commit
249cb690e0
@ -0,0 +1,115 @@
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package ssh
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import (
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"errors"
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"io"
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"net"
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)
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// streamLocalChannelOpenDirectMsg is a struct used for SSH_MSG_CHANNEL_OPEN message
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// with "direct-streamlocal@openssh.com" string.
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//
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// See openssh-portable/PROTOCOL, section 2.4. connection: Unix domain socket forwarding
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// https://github.com/openssh/openssh-portable/blob/master/PROTOCOL#L235
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type streamLocalChannelOpenDirectMsg struct {
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socketPath string
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reserved0 string
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reserved1 uint32
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}
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// forwardedStreamLocalPayload is a struct used for SSH_MSG_CHANNEL_OPEN message
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// with "forwarded-streamlocal@openssh.com" string.
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type forwardedStreamLocalPayload struct {
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SocketPath string
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Reserved0 string
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}
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// streamLocalChannelForwardMsg is a struct used for SSH2_MSG_GLOBAL_REQUEST message
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// with "streamlocal-forward@openssh.com"/"cancel-streamlocal-forward@openssh.com" string.
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type streamLocalChannelForwardMsg struct {
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socketPath string
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}
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// ListenUnix is similar to ListenTCP but uses a Unix domain socket.
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func (c *Client) ListenUnix(socketPath string) (net.Listener, error) {
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m := streamLocalChannelForwardMsg{
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socketPath,
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}
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// send message
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ok, _, err := c.SendRequest("streamlocal-forward@openssh.com", true, Marshal(&m))
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if err != nil {
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return nil, err
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}
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if !ok {
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return nil, errors.New("ssh: streamlocal-forward@openssh.com request denied by peer")
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}
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ch := c.forwards.add(&net.UnixAddr{Name: socketPath, Net: "unix"})
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return &unixListener{socketPath, c, ch}, nil
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}
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func (c *Client) dialStreamLocal(socketPath string) (Channel, error) {
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msg := streamLocalChannelOpenDirectMsg{
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socketPath: socketPath,
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}
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ch, in, err := c.OpenChannel("direct-streamlocal@openssh.com", Marshal(&msg))
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if err != nil {
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return nil, err
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}
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go DiscardRequests(in)
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return ch, err
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}
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type unixListener struct {
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socketPath string
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conn *Client
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in <-chan forward
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}
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// Accept waits for and returns the next connection to the listener.
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func (l *unixListener) Accept() (net.Conn, error) {
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s, ok := <-l.in
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if !ok {
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return nil, io.EOF
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}
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ch, incoming, err := s.newCh.Accept()
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if err != nil {
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return nil, err
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}
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go DiscardRequests(incoming)
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return &chanConn{
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Channel: ch,
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laddr: &net.UnixAddr{
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Name: l.socketPath,
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Net: "unix",
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},
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raddr: &net.UnixAddr{
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Name: "@",
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Net: "unix",
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},
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}, nil
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}
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// Close closes the listener.
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func (l *unixListener) Close() error {
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// this also closes the listener.
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l.conn.forwards.remove(&net.UnixAddr{Name: l.socketPath, Net: "unix"})
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m := streamLocalChannelForwardMsg{
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l.socketPath,
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}
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ok, _, err := l.conn.SendRequest("cancel-streamlocal-forward@openssh.com", true, Marshal(&m))
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if err == nil && !ok {
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err = errors.New("ssh: cancel-streamlocal-forward@openssh.com failed")
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}
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return err
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}
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// Addr returns the listener's network address.
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func (l *unixListener) Addr() net.Addr {
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return &net.UnixAddr{
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Name: l.socketPath,
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Net: "unix",
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}
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}
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