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Support for native guest agent connection for each driver
Signed-off-by: Balaji Vijayakumar <kuttibalaji.v6@gmail.com>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,56 @@ | ||
| package serialport | ||
|
|
||
| import ( | ||
| "net" | ||
| "time" | ||
| ) | ||
|
|
||
| type SerialConn struct { | ||
| serialDevice string | ||
| port *Port | ||
| } | ||
|
|
||
| var _ net.Conn = (*SerialConn)(nil) | ||
|
|
||
| func DialSerial(serialDevice string) (*SerialConn, error) { | ||
| s, err := openPort(serialDevice) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
|
|
||
| return &SerialConn{port: s, serialDevice: serialDevice}, nil | ||
| } | ||
|
|
||
| func (c *SerialConn) Read(b []byte) (n int, err error) { | ||
| return c.port.Read(b) | ||
| } | ||
|
|
||
| func (c *SerialConn) Write(b []byte) (n int, err error) { | ||
| return c.port.Write(b) | ||
| } | ||
|
|
||
| func (c *SerialConn) Close() error { | ||
| // There is no need to close the serial port every time. | ||
| // So just do nothing. | ||
| return nil | ||
| } | ||
|
|
||
| func (c *SerialConn) LocalAddr() net.Addr { | ||
| return &net.UnixAddr{Name: "virtio-port:" + c.serialDevice, Net: "virtio"} | ||
| } | ||
|
|
||
| func (c *SerialConn) RemoteAddr() net.Addr { | ||
| return &net.UnixAddr{Name: "qemu-host", Net: "virtio"} | ||
| } | ||
|
|
||
| func (c *SerialConn) SetDeadline(_ time.Time) error { | ||
| return nil | ||
| } | ||
|
|
||
| func (c *SerialConn) SetReadDeadline(_ time.Time) error { | ||
| return nil | ||
| } | ||
|
|
||
| func (c *SerialConn) SetWriteDeadline(_ time.Time) error { | ||
| return nil | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,63 @@ | ||
| package serialport | ||
|
|
||
| import ( | ||
| "net" | ||
| "sync" | ||
| "syscall" | ||
|
|
||
| "golang.org/x/net/netutil" | ||
| ) | ||
|
|
||
| type SerialListener struct { | ||
| mu sync.Mutex | ||
| conn *SerialConn | ||
| closed bool | ||
| } | ||
|
|
||
| func Listen(serialDevice string) (net.Listener, error) { | ||
| c, err := DialSerial(serialDevice) | ||
| if err != nil { | ||
| return nil, &net.OpError{Op: "dial", Net: "virtio", Source: c.LocalAddr(), Addr: nil, Err: err} | ||
| } | ||
|
|
||
| return netutil.LimitListener(&SerialListener{conn: c}, 1), nil | ||
| } | ||
|
|
||
| func (ln *SerialListener) ok() bool { | ||
| return ln != nil && ln.conn != nil && !ln.closed | ||
| } | ||
|
|
||
| func (ln *SerialListener) Accept() (net.Conn, error) { | ||
| ln.mu.Lock() | ||
| defer ln.mu.Unlock() | ||
|
|
||
| if !ln.ok() { | ||
| return nil, syscall.EINVAL | ||
| } | ||
|
|
||
| return ln.conn, nil | ||
| } | ||
|
|
||
| func (ln *SerialListener) Close() error { | ||
| ln.mu.Lock() | ||
| defer ln.mu.Unlock() | ||
|
|
||
| if !ln.ok() { | ||
| return syscall.EINVAL | ||
| } | ||
|
|
||
| if ln.closed { | ||
| return nil | ||
| } | ||
| ln.closed = true | ||
|
|
||
| return nil | ||
| } | ||
|
|
||
| func (ln *SerialListener) Addr() net.Addr { | ||
| if ln.ok() { | ||
| return ln.conn.LocalAddr() | ||
| } | ||
|
|
||
| return nil | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,43 @@ | ||
| package serialport | ||
|
|
||
| import ( | ||
| "os" | ||
|
|
||
| "golang.org/x/sys/unix" | ||
| ) | ||
|
|
||
| func openPort(name string) (p *Port, err error) { | ||
| f, err := os.OpenFile(name, unix.O_RDWR|unix.O_NOCTTY|unix.O_NONBLOCK, 0o666) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
|
|
||
| defer func() { | ||
| if err != nil && f != nil { | ||
| f.Close() | ||
| } | ||
| }() | ||
|
|
||
| fd := f.Fd() | ||
| if err = unix.SetNonblock(int(fd), false); err != nil { | ||
| return nil, err | ||
| } | ||
|
|
||
| return &Port{f: f}, nil | ||
| } | ||
|
|
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| type Port struct { | ||
| f *os.File | ||
| } | ||
|
|
||
| func (p *Port) Read(b []byte) (n int, err error) { | ||
| return p.f.Read(b) | ||
| } | ||
|
|
||
| func (p *Port) Write(b []byte) (n int, err error) { | ||
| return p.f.Write(b) | ||
| } | ||
|
|
||
| func (p *Port) Close() (err error) { | ||
| return p.f.Close() | ||
| } |
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