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| 1 | +package tart |
| 2 | + |
| 3 | +/* |
| 4 | +#cgo CFLAGS: -x objective-c |
| 5 | +#cgo LDFLAGS: -framework Foundation -framework CoreGraphics -framework Vision |
| 6 | +
|
| 7 | +#import <stdlib.h> |
| 8 | +#import "vnc.mm" |
| 9 | +
|
| 10 | +*/ |
| 11 | +import "C" |
| 12 | + |
| 13 | +import ( |
| 14 | + "context" |
| 15 | + "fmt" |
| 16 | + "github.com/hashicorp/packer-plugin-sdk/bootcommand" |
| 17 | + "github.com/mitchellh/go-vnc" |
| 18 | + "io" |
| 19 | + "os" |
| 20 | + "strings" |
| 21 | + "time" |
| 22 | + |
| 23 | + "image" |
| 24 | + "image/color" |
| 25 | + |
| 26 | + "unsafe" |
| 27 | +) |
| 28 | + |
| 29 | +type customDriver struct { |
| 30 | + vncClient *vnc.ClientConn |
| 31 | + serverMessageChannel chan vnc.ServerMessage |
| 32 | + config *Config |
| 33 | + vncDriver bootcommand.BCDriver |
| 34 | + keyInterval time.Duration |
| 35 | + ctx context.Context |
| 36 | + frameBuffer *image.RGBA |
| 37 | + waitString strings.Builder |
| 38 | +} |
| 39 | + |
| 40 | +func newCustomDriver(vncClient *vnc.ClientConn, |
| 41 | + serverMessageChannel chan vnc.ServerMessage, |
| 42 | + config *Config, |
| 43 | + ctx context.Context) *customDriver { |
| 44 | + |
| 45 | + // Resolve key interval manually so we can accurately report it back |
| 46 | + keyInterval := bootcommand.PackerKeyDefault |
| 47 | + if delay, err := time.ParseDuration(os.Getenv(bootcommand.PackerKeyEnv)); err == nil { |
| 48 | + keyInterval = delay |
| 49 | + } |
| 50 | + if config.BootKeyInterval > time.Duration(0) { |
| 51 | + keyInterval = config.BootKeyInterval |
| 52 | + } |
| 53 | + |
| 54 | + w, h := int(vncClient.FrameBufferWidth), int(vncClient.FrameBufferHeight) |
| 55 | + |
| 56 | + d := &customDriver{ |
| 57 | + vncClient: vncClient, |
| 58 | + serverMessageChannel: serverMessageChannel, |
| 59 | + config: config, |
| 60 | + vncDriver: bootcommand.NewVNCDriver(vncClient, keyInterval), |
| 61 | + keyInterval: keyInterval, |
| 62 | + ctx: ctx, |
| 63 | + frameBuffer: image.NewRGBA(image.Rect(0, 0, w, h)), |
| 64 | + } |
| 65 | + |
| 66 | + return d |
| 67 | +} |
| 68 | + |
| 69 | +func (d *customDriver) KeyInterval() time.Duration { |
| 70 | + return d.keyInterval |
| 71 | +} |
| 72 | + |
| 73 | +const WaitForStringStart uint32 = 0xE000 |
| 74 | +const WaitForStringEnd uint32 = 0xE0001 |
| 75 | + |
| 76 | +func (d *customDriver) SendKey(key rune, action bootcommand.KeyAction) error { |
| 77 | + switch uint32(key) { |
| 78 | + case WaitForStringStart: |
| 79 | + d.waitString.Grow(1) |
| 80 | + return nil |
| 81 | + case WaitForStringEnd: |
| 82 | + waitString := d.waitString.String() |
| 83 | + d.waitString.Reset() |
| 84 | + |
| 85 | + waitStringCStr := C.CString(waitString) |
| 86 | + defer C.free(unsafe.Pointer(waitStringCStr)) |
| 87 | + |
| 88 | + for { |
| 89 | + fmt.Fprintf(os.Stderr, "🔎 Looking for '%s'...\n", waitString) |
| 90 | + if C.recognizeTextInFramebuffer(waitStringCStr, |
| 91 | + unsafe.Pointer(&d.frameBuffer.Pix[0]), |
| 92 | + C.int(d.frameBuffer.Bounds().Dx()), |
| 93 | + C.int(d.frameBuffer.Bounds().Dy())) { |
| 94 | + break |
| 95 | + } |
| 96 | + |
| 97 | + if err := d.WaitForFramebufferUpdate(); err != nil { |
| 98 | + return err |
| 99 | + } |
| 100 | + } |
| 101 | + |
| 102 | + return nil |
| 103 | + default: |
| 104 | + if d.waitString.Cap() > 0 { |
| 105 | + d.waitString.WriteRune(key) |
| 106 | + return nil |
| 107 | + } else { |
| 108 | + return d.vncDriver.SendKey(key, action) |
| 109 | + } |
| 110 | + } |
| 111 | +} |
| 112 | + |
| 113 | +func (d *customDriver) SendSpecial(special string, action bootcommand.KeyAction) error { |
| 114 | + return d.vncDriver.SendSpecial(special, action) |
| 115 | +} |
| 116 | + |
| 117 | +func (d *customDriver) Flush() error { |
| 118 | + return d.vncDriver.Flush() |
| 119 | +} |
| 120 | + |
| 121 | +func (d *customDriver) WaitForFramebufferUpdate() error { |
| 122 | + |
| 123 | + for { |
| 124 | + w, h := d.vncClient.FrameBufferWidth, d.vncClient.FrameBufferHeight |
| 125 | + fmt.Fprintf(os.Stderr, "📡 Requesting frame buffer update for %dx%d\n", w, h) |
| 126 | + |
| 127 | + if err := d.vncClient.FramebufferUpdateRequest(true, 0, 0, w, h); err != nil { |
| 128 | + return err |
| 129 | + } |
| 130 | + |
| 131 | + select { |
| 132 | + case msg := <-d.serverMessageChannel: |
| 133 | + if framebufferUpdateMessage, ok := msg.(*vnc.FramebufferUpdateMessage); ok { |
| 134 | + if len(framebufferUpdateMessage.Rectangles) == 0 { |
| 135 | + return fmt.Errorf("⚠️ Frame update did not have any rectangles") |
| 136 | + } |
| 137 | + |
| 138 | + for _, rect := range framebufferUpdateMessage.Rectangles { |
| 139 | + switch encoding := rect.Enc.(type) { |
| 140 | + case *DesktopSizePseudoEncoding: |
| 141 | + w, h := int(d.vncClient.FrameBufferWidth), int(d.vncClient.FrameBufferHeight) |
| 142 | + d.frameBuffer = image.NewRGBA(image.Rect(0, 0, w, h)) |
| 143 | + fmt.Fprintf(os.Stderr, "🖥️ New desktop size is %dx%d, resized framebuffer\n", w, h) |
| 144 | + continue |
| 145 | + case *vnc.RawEncoding: |
| 146 | + for i, c := range encoding.Colors { |
| 147 | + x, y := i%int(rect.Width), i/int(rect.Width) |
| 148 | + r, g, b := uint8(c.R), uint8(c.G), uint8(c.B) |
| 149 | + d.frameBuffer.Set(int(rect.X)+x, int(rect.Y)+y, color.RGBA{r, g, b, 255}) |
| 150 | + } |
| 151 | + default: |
| 152 | + return fmt.Errorf("⚠️ Frame had unknown encoding %s", encoding) |
| 153 | + } |
| 154 | + } |
| 155 | + return nil |
| 156 | + } else { |
| 157 | + // Ignore messages we didn't ask for |
| 158 | + fmt.Fprintln(os.Stderr, "⚠️ Ignoring unknown message type", msg.Type(), msg) |
| 159 | + continue |
| 160 | + } |
| 161 | + case <-d.ctx.Done(): |
| 162 | + return d.ctx.Err() |
| 163 | + } |
| 164 | + } |
| 165 | +} |
| 166 | + |
| 167 | +type DesktopSizePseudoEncoding struct{} |
| 168 | + |
| 169 | +func (*DesktopSizePseudoEncoding) Read(c *vnc.ClientConn, rect *vnc.Rectangle, r io.Reader) (vnc.Encoding, error) { |
| 170 | + c.FrameBufferWidth = rect.Width |
| 171 | + c.FrameBufferHeight = rect.Height |
| 172 | + return &DesktopSizePseudoEncoding{}, nil |
| 173 | +} |
| 174 | + |
| 175 | +func (*DesktopSizePseudoEncoding) Type() int32 { |
| 176 | + return -223 // RFC 6143 7.8.2 |
| 177 | +} |
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