VNC server (Anthony Liguori)

git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@1869 c046a42c-6fe2-441c-8c8c-71466251a162

1 files changed, 894 insertions, 0 deletions

diff --git a/vnc.c b/vnc.c
new file mode 100644
index 0000000..f461de6
--- /dev/null
+++ b/vnc.c
@@ -0,0 +1,894 @@
+#include "vl.h"
+
+#include <sys/socket.h>
+#include <netinet/in.h>
+#include <netinet/tcp.h>
+#include <fcntl.h>
+
+#define VNC_REFRESH_INTERVAL (1000 / 30)
+
+#include "vnc_keysym.h"
+#include "keymaps.c"
+
+typedef struct Buffer
+{
+    size_t capacity;
+    size_t offset;
+    char *buffer;
+} Buffer;
+
+typedef struct VncState VncState;
+
+typedef int VncReadEvent(VncState *vs, char *data, size_t len);
+
+struct VncState
+{
+    QEMUTimer *timer;
+    int lsock;
+    int csock;
+    DisplayState *ds;
+    int need_update;
+    int width;
+    int height;
+    uint64_t dirty_row[768];
+    char *old_data;
+    int depth;
+    int has_resize;
+    int has_hextile;
+    Buffer output;
+    Buffer input;
+    kbd_layout_t *kbd_layout;
+
+    VncReadEvent *read_handler;
+    size_t read_handler_expect;
+};
+
+/* TODO
+   1) Get the queue working for IO.
+   2) there is some weirdness when using the -S option (the screen is grey
+      and not totally invalidated
+   3) resolutions > 1024
+*/
+
+static void vnc_write(VncState *vs, const void *data, size_t len);
+static void vnc_write_u32(VncState *vs, uint32_t value);
+static void vnc_write_s32(VncState *vs, int32_t value);
+static void vnc_write_u16(VncState *vs, uint16_t value);
+static void vnc_write_u8(VncState *vs, uint8_t value);
+static void vnc_flush(VncState *vs);
+static void vnc_update_client(void *opaque);
+static void vnc_client_read(void *opaque);
+
+static void vnc_dpy_update(DisplayState *ds, int x, int y, int w, int h)
+{
+    VncState *vs = ds->opaque;
+    int i;
+
+    h += y;
+
+    for (; y < h; y++)
+	for (i = 0; i < w; i += 16)
+	    vs->dirty_row[y] |= (1ULL << ((x + i) / 16));
+}
+
+static void vnc_framebuffer_update(VncState *vs, int x, int y, int w, int h,
+				   int32_t encoding)
+{
+    vnc_write_u16(vs, x);
+    vnc_write_u16(vs, y);
+    vnc_write_u16(vs, w);
+    vnc_write_u16(vs, h);
+
+    vnc_write_s32(vs, encoding);
+}
+
+static void vnc_dpy_resize(DisplayState *ds, int w, int h)
+{
+    VncState *vs = ds->opaque;
+
+    ds->data = realloc(ds->data, w * h * vs->depth);
+    vs->old_data = realloc(vs->old_data, w * h * vs->depth);
+
+    if (ds->data == NULL || vs->old_data == NULL) {
+	fprintf(stderr, "vnc: memory allocation failed\n");
+	exit(1);
+    }
+
+    ds->depth = vs->depth * 8;
+    ds->width = w;
+    ds->height = h;
+    ds->linesize = w * vs->depth;
+    if (vs->csock != -1 && vs->has_resize) {
+	vnc_write_u8(vs, 0);  /* msg id */
+	vnc_write_u8(vs, 0);
+	vnc_write_u16(vs, 1); /* number of rects */
+	vnc_framebuffer_update(vs, 0, 0, ds->width, ds->height, -223);
+	vnc_flush(vs);
+	vs->width = ds->width;
+	vs->height = ds->height;
+    }
+}
+
+static void send_framebuffer_update_raw(VncState *vs, int x, int y, int w, int h)
+{
+    int i;
+    char *row;
+
+    vnc_framebuffer_update(vs, x, y, w, h, 0);
+
+    row = vs->ds->data + y * vs->ds->linesize + x * vs->depth;
+    for (i = 0; i < h; i++) {
+	vnc_write(vs, row, w * vs->depth);
+	row += vs->ds->linesize;
+    }
+}
+
+static void hextile_enc_cord(uint8_t *ptr, int x, int y, int w, int h)
+{
+    ptr[0] = ((x & 0x0F) << 4) | (y & 0x0F);
+    ptr[1] = (((w - 1) & 0x0F) << 4) | ((h - 1) & 0x0F);
+}
+
+#define BPP 8
+#include "vnchextile.h"
+#undef BPP
+
+#define BPP 16
+#include "vnchextile.h"
+#undef BPP
+
+#define BPP 32
+#include "vnchextile.h"
+#undef BPP
+
+static void send_framebuffer_update_hextile(VncState *vs, int x, int y, int w, int h)
+{
+    int i, j;
+    int has_fg, has_bg;
+    uint32_t last_fg32, last_bg32;
+    uint16_t last_fg16, last_bg16;
+    uint8_t last_fg8, last_bg8;
+
+    vnc_framebuffer_update(vs, x, y, w, h, 5);
+
+    has_fg = has_bg = 0;
+    for (j = y; j < (y + h); j += 16) {
+	for (i = x; i < (x + w); i += 16) {
+	    switch (vs->depth) {
+	    case 1:
+		send_hextile_tile_8(vs, i, j, MIN(16, x + w - i), MIN(16, y + h - j),
+				    &last_bg8, &last_fg8, &has_bg, &has_fg);
+		break;
+	    case 2:
+		send_hextile_tile_16(vs, i, j, MIN(16, x + w - i), MIN(16, y + h - j),
+				     &last_bg16, &last_fg16, &has_bg, &has_fg);
+		break;
+	    case 4:
+		send_hextile_tile_32(vs, i, j, MIN(16, x + w - i), MIN(16, y + h - j),
+				     &last_bg32, &last_fg32, &has_bg, &has_fg);
+		break;
+	    default:
+		break;
+	    }
+	}
+    }
+}
+
+static void send_framebuffer_update(VncState *vs, int x, int y, int w, int h)
+{
+	if (vs->has_hextile)
+	    send_framebuffer_update_hextile(vs, x, y, w, h);
+	else
+	    send_framebuffer_update_raw(vs, x, y, w, h);
+}
+
+static void vnc_copy(DisplayState *ds, int src_x, int src_y, int dst_x, int dst_y, int w, int h)
+{
+    int src, dst;
+    char *src_row;
+    char *dst_row;
+    char *old_row;
+    int y = 0;
+    int pitch = ds->linesize;
+    VncState *vs = ds->opaque;
+
+    vnc_update_client(vs);
+
+    if (dst_y > src_y) {
+	y = h - 1;
+	pitch = -pitch;
+    }
+
+    src = (ds->linesize * (src_y + y) + vs->depth * src_x);
+    dst = (ds->linesize * (dst_y + y) + vs->depth * dst_x);
+
+    src_row = ds->data + src;
+    dst_row = ds->data + dst;
+    old_row = vs->old_data + dst;
+
+    for (y = 0; y < h; y++) {
+	memmove(old_row, src_row, w * vs->depth);
+	memmove(dst_row, src_row, w * vs->depth);
+	src_row += pitch;
+	dst_row += pitch;
+	old_row += pitch;
+    }
+
+    vnc_write_u8(vs, 0);  /* msg id */
+    vnc_write_u8(vs, 0);
+    vnc_write_u16(vs, 1); /* number of rects */
+    vnc_framebuffer_update(vs, dst_x, dst_y, w, h, 1);
+    vnc_write_u16(vs, src_x);
+    vnc_write_u16(vs, src_y);
+    vnc_flush(vs);
+}
+
+static int find_dirty_height(VncState *vs, int y, int last_x, int x)
+{
+    int h;
+
+    for (h = 1; h < (vs->height - y); h++) {
+	int tmp_x;
+	if (!(vs->dirty_row[y + h] & (1ULL << last_x)))
+	    break;
+	for (tmp_x = last_x; tmp_x < x; tmp_x++)
+	    vs->dirty_row[y + h] &= ~(1ULL << tmp_x);
+    }
+
+    return h;
+}
+
+static void vnc_update_client(void *opaque)
+{
+    VncState *vs = opaque;
+
+    if (vs->need_update && vs->csock != -1) {
+	int y;
+	char *row;
+	char *old_row;
+	uint64_t width_mask;
+	int n_rectangles;
+	int saved_offset;
+	int has_dirty = 0;
+
+	width_mask = (1ULL << (vs->width / 16)) - 1;
+
+	if (vs->width == 1024)
+	    width_mask = ~(0ULL);
+
+	/* Walk through the dirty map and eliminate tiles that
+	   really aren't dirty */
+	row = vs->ds->data;
+	old_row = vs->old_data;
+
+	for (y = 0; y < vs->height; y++) {
+	    if (vs->dirty_row[y] & width_mask) {
+		int x;
+		char *ptr, *old_ptr;
+
+		ptr = row;
+		old_ptr = old_row;
+
+		for (x = 0; x < vs->ds->width; x += 16) {
+		    if (memcmp(old_ptr, ptr, 16 * vs->depth) == 0) {
+			vs->dirty_row[y] &= ~(1ULL << (x / 16));
+		    } else {
+			has_dirty = 1;
+			memcpy(old_ptr, ptr, 16 * vs->depth);
+		    }
+
+		    ptr += 16 * vs->depth;
+		    old_ptr += 16 * vs->depth;
+		}
+	    }
+
+	    row += vs->ds->linesize;
+	    old_row += vs->ds->linesize;
+	}
+
+	if (!has_dirty) {
+	    qemu_mod_timer(vs->timer, qemu_get_clock(rt_clock) + VNC_REFRESH_INTERVAL);
+	    return;
+	}
+
+	/* Count rectangles */
+	n_rectangles = 0;
+	vnc_write_u8(vs, 0);  /* msg id */
+	vnc_write_u8(vs, 0);
+	saved_offset = vs->output.offset;
+	vnc_write_u16(vs, 0);
+
+	for (y = 0; y < vs->height; y++) {
+	    int x;
+	    int last_x = -1;
+	    for (x = 0; x < vs->width / 16; x++) {
+		if (vs->dirty_row[y] & (1ULL << x)) {
+		    if (last_x == -1) {
+			last_x = x;
+		    }
+		    vs->dirty_row[y] &= ~(1ULL << x);
+		} else {
+		    if (last_x != -1) {
+			int h = find_dirty_height(vs, y, last_x, x);
+			send_framebuffer_update(vs, last_x * 16, y, (x - last_x) * 16, h);
+			n_rectangles++;
+		    }
+		    last_x = -1;
+		}
+	    }
+	    if (last_x != -1) {
+		int h = find_dirty_height(vs, y, last_x, x);
+		send_framebuffer_update(vs, last_x * 16, y, (x - last_x) * 16, h);
+		n_rectangles++;
+	    }
+	}
+	vs->output.buffer[saved_offset] = (n_rectangles >> 8) & 0xFF;
+	vs->output.buffer[saved_offset + 1] = n_rectangles & 0xFF;
+	vnc_flush(vs);
+
+    }
+    qemu_mod_timer(vs->timer, qemu_get_clock(rt_clock) + VNC_REFRESH_INTERVAL);
+}
+
+static void vnc_timer_init(VncState *vs)
+{
+    if (vs->timer == NULL) {
+	vs->timer = qemu_new_timer(rt_clock, vnc_update_client, vs);
+	qemu_mod_timer(vs->timer, qemu_get_clock(rt_clock));
+    }
+}
+
+static void vnc_dpy_refresh(DisplayState *ds)
+{
+    VncState *vs = ds->opaque;
+    vnc_timer_init(vs);
+    vga_hw_update();
+}
+
+static int vnc_listen_poll(void *opaque)
+{
+    VncState *vs = opaque;
+    if (vs->csock == -1)
+	return 1;
+    return 0;
+}
+
+static void buffer_reserve(Buffer *buffer, size_t len)
+{
+    if ((buffer->capacity - buffer->offset) < len) {
+	buffer->capacity += (len + 1024);
+	buffer->buffer = realloc(buffer->buffer, buffer->capacity);
+	if (buffer->buffer == NULL) {
+	    fprintf(stderr, "vnc: out of memory\n");
+	    exit(1);
+	}
+    }
+}
+
+static int buffer_empty(Buffer *buffer)
+{
+    return buffer->offset == 0;
+}
+
+static char *buffer_end(Buffer *buffer)
+{
+    return buffer->buffer + buffer->offset;
+}
+
+static void buffer_reset(Buffer *buffer)
+{
+	buffer->offset = 0;
+}
+
+static void buffer_append(Buffer *buffer, const void *data, size_t len)
+{
+    memcpy(buffer->buffer + buffer->offset, data, len);
+    buffer->offset += len;
+}
+
+static int vnc_client_io_error(VncState *vs, int ret)
+{
+    if (ret == 0 || ret == -1) {
+	if (ret == -1 && (errno == EINTR || errno == EAGAIN))
+	    return 0;
+
+	qemu_set_fd_handler2(vs->csock, NULL, NULL, NULL, NULL);
+	close(vs->csock);
+	vs->csock = -1;
+	buffer_reset(&vs->input);
+	buffer_reset(&vs->output);
+	vs->need_update = 0;
+	return 0;
+    }
+    return ret;
+}
+
+static void vnc_client_error(VncState *vs)
+{
+    errno = EINVAL;
+    vnc_client_io_error(vs, -1);
+}
+
+static void vnc_client_write(void *opaque)
+{
+    ssize_t ret;
+    VncState *vs = opaque;
+
+    ret = write(vs->csock, vs->output.buffer, vs->output.offset);
+    ret = vnc_client_io_error(vs, ret);
+    if (!ret)
+	return;
+
+    memmove(vs->output.buffer, vs->output.buffer + ret, (vs->output.offset - ret));
+    vs->output.offset -= ret;
+
+    if (vs->output.offset == 0) {
+	qemu_set_fd_handler2(vs->csock, NULL, vnc_client_read, NULL, vs);
+    }
+}
+
+static void vnc_read_when(VncState *vs, VncReadEvent *func, size_t expecting)
+{
+    vs->read_handler = func;
+    vs->read_handler_expect = expecting;
+}
+
+static void vnc_client_read(void *opaque)
+{
+    VncState *vs = opaque;
+    ssize_t ret;
+
+    buffer_reserve(&vs->input, 4096);
+
+    ret = read(vs->csock, buffer_end(&vs->input), 4096);
+    ret = vnc_client_io_error(vs, ret);
+    if (!ret)
+	return;
+
+    vs->input.offset += ret;
+
+    while (vs->read_handler && vs->input.offset >= vs->read_handler_expect) {
+	size_t len = vs->read_handler_expect;
+	int ret;
+
+	ret = vs->read_handler(vs, vs->input.buffer, len);
+	if (vs->csock == -1)
+	    return;
+
+	if (!ret) {
+	    memmove(vs->input.buffer, vs->input.buffer + len, (vs->input.offset - len));
+	    vs->input.offset -= len;
+	} else {
+	    vs->read_handler_expect = ret;
+	}
+    }
+}
+
+static void vnc_write(VncState *vs, const void *data, size_t len)
+{
+    buffer_reserve(&vs->output, len);
+
+    if (buffer_empty(&vs->output)) {
+	qemu_set_fd_handler2(vs->csock, NULL, vnc_client_read, vnc_client_write, vs);
+    }
+
+    buffer_append(&vs->output, data, len);
+}
+
+static void vnc_write_s32(VncState *vs, int32_t value)
+{
+    vnc_write_u32(vs, *(uint32_t *)&value);
+}
+
+static void vnc_write_u32(VncState *vs, uint32_t value)
+{
+    uint8_t buf[4];
+
+    buf[0] = (value >> 24) & 0xFF;
+    buf[1] = (value >> 16) & 0xFF;
+    buf[2] = (value >>  8) & 0xFF;
+    buf[3] = value & 0xFF;
+
+    vnc_write(vs, buf, 4);
+}
+
+static void vnc_write_u16(VncState *vs, uint16_t value)
+{
+    char buf[2];
+
+    buf[0] = (value >> 8) & 0xFF;
+    buf[1] = value & 0xFF;
+
+    vnc_write(vs, buf, 2);
+}
+
+static void vnc_write_u8(VncState *vs, uint8_t value)
+{
+    vnc_write(vs, (char *)&value, 1);
+}
+
+static void vnc_flush(VncState *vs)
+{
+    if (vs->output.offset)
+	vnc_client_write(vs);
+}
+
+static uint8_t read_u8(char *data, size_t offset)
+{
+    return data[offset];
+}
+
+static uint16_t read_u16(char *data, size_t offset)
+{
+    return ((data[offset] & 0xFF) << 8) | (data[offset + 1] & 0xFF);
+}
+
+static int32_t read_s32(char *data, size_t offset)
+{
+    return (int32_t)((data[offset] << 24) | (data[offset + 1] << 16) |
+		     (data[offset + 2] << 8) | data[offset + 3]);
+}
+
+static uint32_t read_u32(char *data, size_t offset)
+{
+    return ((data[offset] << 24) | (data[offset + 1] << 16) |
+	    (data[offset + 2] << 8) | data[offset + 3]);
+}
+
+static void client_cut_text(VncState *vs, size_t len, char *text)
+{
+}
+
+static void pointer_event(VncState *vs, int button_mask, int x, int y)
+{
+    int buttons = 0;
+    int dz = 0;
+
+    if (button_mask & 0x01)
+	buttons |= MOUSE_EVENT_LBUTTON;
+    if (button_mask & 0x02)
+	buttons |= MOUSE_EVENT_MBUTTON;
+    if (button_mask & 0x04)
+	buttons |= MOUSE_EVENT_RBUTTON;
+    if (button_mask & 0x08)
+	dz = -1;
+    if (button_mask & 0x10)
+	dz = 1;
+	    
+    if (kbd_mouse_is_absolute()) {
+	kbd_mouse_event(x * 0x7FFF / vs->ds->width,
+			y * 0x7FFF / vs->ds->height,
+			dz, buttons);
+    } else {
+	static int last_x = -1;
+	static int last_y = -1;
+
+	if (last_x != -1)
+	    kbd_mouse_event(x - last_x, y - last_y, dz, buttons);
+
+	last_x = x;
+	last_y = y;
+    }
+}
+
+static void key_event(VncState *vs, int down, uint32_t sym)
+{
+    int keycode;
+
+    keycode = keysym2scancode(vs->kbd_layout, sym & 0xFFFF);
+
+    if (keycode & 0x80)
+	kbd_put_keycode(0xe0);
+    if (down)
+	kbd_put_keycode(keycode & 0x7f);
+    else
+	kbd_put_keycode(keycode | 0x80);
+}
+
+static void framebuffer_update_request(VncState *vs, int incremental,
+				       int x_position, int y_position,
+				       int w, int h)
+{
+    int i;
+    vs->need_update = 1;
+    if (!incremental) {
+	char *old_row = vs->old_data + y_position * vs->ds->linesize;
+
+	for (i = 0; i < h; i++) {
+	    vs->dirty_row[y_position + i] = (1ULL << (vs->ds->width / 16)) - 1;
+	    if (vs->ds->width == 1024) {
+	      vs->dirty_row[y_position + i] = ~(0ULL);
+	    }
+	    memset(old_row, 42, vs->ds->width * vs->depth);
+	    old_row += vs->ds->linesize;
+	}
+    }
+}
+
+static void set_encodings(VncState *vs, int32_t *encodings, size_t n_encodings)
+{
+    int i;
+
+    vs->has_hextile = 0;
+    vs->has_resize = 0;
+    vs->ds->dpy_copy = NULL;
+
+    for (i = n_encodings - 1; i >= 0; i--) {
+	switch (encodings[i]) {
+	case 0: /* Raw */
+	    vs->has_hextile = 0;
+	    break;
+	case 1: /* CopyRect */
+	    vs->ds->dpy_copy = vnc_copy;
+	    break;
+	case 5: /* Hextile */
+	    vs->has_hextile = 1;
+	    break;
+	case -223: /* DesktopResize */
+	    vs->has_resize = 1;
+	    break;
+	default:
+	    break;
+	}
+    }
+}
+
+static void set_pixel_format(VncState *vs,
+			     int bits_per_pixel, int depth,
+			     int big_endian_flag, int true_color_flag,
+			     int red_max, int green_max, int blue_max,
+			     int red_shift, int green_shift, int blue_shift)
+{
+    switch (bits_per_pixel) {
+    case 32:
+    case 24:
+	vs->depth = 4;
+	break;
+    case 16:
+	vs->depth = 2;
+	break;
+    case 8:
+	vs->depth = 1;
+	break;
+    default:
+	vnc_client_error(vs);
+	break;
+    }
+
+    if (!true_color_flag)
+	vnc_client_error(vs);
+
+    vnc_dpy_resize(vs->ds, vs->ds->width, vs->ds->height);
+    memset(vs->dirty_row, 0xFF, sizeof(vs->dirty_row));
+    memset(vs->old_data, 42, vs->ds->linesize * vs->ds->height);
+
+    vga_hw_invalidate();
+    vga_hw_update();
+}
+
+static int protocol_client_msg(VncState *vs, char *data, size_t len)
+{
+    int i;
+    uint16_t limit;
+
+    switch (data[0]) {
+    case 0:
+	if (len == 1)
+	    return 20;
+
+	set_pixel_format(vs, read_u8(data, 4), read_u8(data, 5),
+			 read_u8(data, 6), read_u8(data, 7),
+			 read_u16(data, 8), read_u16(data, 10),
+			 read_u16(data, 12), read_u8(data, 14),
+			 read_u8(data, 15), read_u8(data, 16));
+	break;
+    case 2:
+	if (len == 1)
+	    return 4;
+
+	if (len == 4)
+	    return 4 + (read_u16(data, 2) * 4);
+
+	limit = read_u16(data, 2);
+	for (i = 0; i < limit; i++) {
+	    int32_t val = read_s32(data, 4 + (i * 4));
+	    memcpy(data + 4 + (i * 4), &val, sizeof(val));
+	}
+
+	set_encodings(vs, (int32_t *)(data + 4), limit);
+	break;
+    case 3:
+	if (len == 1)
+	    return 10;
+
+	framebuffer_update_request(vs,
+				   read_u8(data, 1), read_u16(data, 2), read_u16(data, 4),
+				   read_u16(data, 6), read_u16(data, 8));
+	break;
+    case 4:
+	if (len == 1)
+	    return 8;
+
+	key_event(vs, read_u8(data, 1), read_u32(data, 4));
+	break;
+    case 5:
+	if (len == 1)
+	    return 6;
+
+	pointer_event(vs, read_u8(data, 1), read_u16(data, 2), read_u16(data, 4));
+	break;
+    case 6:
+	if (len == 1)
+	    return 8;
+
+	if (len == 8)
+	    return 8 + read_u32(data, 4);
+
+	client_cut_text(vs, read_u32(data, 4), data + 8);
+	break;
+    default:
+	printf("Msg: %d\n", data[0]);
+	vnc_client_error(vs);
+	break;
+    }
+	
+    vnc_read_when(vs, protocol_client_msg, 1);
+    return 0;
+}
+
+static int protocol_client_init(VncState *vs, char *data, size_t len)
+{
+    char pad[3] = { 0, 0, 0 };
+
+    vs->width = vs->ds->width;
+    vs->height = vs->ds->height;
+    vnc_write_u16(vs, vs->ds->width);
+    vnc_write_u16(vs, vs->ds->height);
+
+    vnc_write_u8(vs, vs->depth * 8); /* bits-per-pixel */
+    vnc_write_u8(vs, vs->depth * 8); /* depth */
+    vnc_write_u8(vs, 0);             /* big-endian-flag */
+    vnc_write_u8(vs, 1);             /* true-color-flag */
+    if (vs->depth == 4) {
+	vnc_write_u16(vs, 0xFF);     /* red-max */
+	vnc_write_u16(vs, 0xFF);     /* green-max */
+	vnc_write_u16(vs, 0xFF);     /* blue-max */
+	vnc_write_u8(vs, 16);        /* red-shift */
+	vnc_write_u8(vs, 8);         /* green-shift */
+	vnc_write_u8(vs, 0);         /* blue-shift */
+    } else if (vs->depth == 2) {
+	vnc_write_u16(vs, 31);       /* red-max */
+	vnc_write_u16(vs, 63);       /* green-max */
+	vnc_write_u16(vs, 31);       /* blue-max */
+	vnc_write_u8(vs, 11);        /* red-shift */
+	vnc_write_u8(vs, 5);         /* green-shift */
+	vnc_write_u8(vs, 0);         /* blue-shift */
+    } else if (vs->depth == 1) {
+	vnc_write_u16(vs, 3);        /* red-max */
+	vnc_write_u16(vs, 7);        /* green-max */
+	vnc_write_u16(vs, 3);        /* blue-max */
+	vnc_write_u8(vs, 5);         /* red-shift */
+	vnc_write_u8(vs, 2);         /* green-shift */
+	vnc_write_u8(vs, 0);         /* blue-shift */
+    }
+	
+    vnc_write(vs, pad, 3);           /* padding */
+
+    vnc_write_u32(vs, 4);        
+    vnc_write(vs, "QEMU", 4);
+    vnc_flush(vs);
+
+    vnc_read_when(vs, protocol_client_msg, 1);
+
+    return 0;
+}
+
+static int protocol_version(VncState *vs, char *version, size_t len)
+{
+    char local[13];
+    int maj, min;
+
+    memcpy(local, version, 12);
+    local[12] = 0;
+
+    if (sscanf(local, "RFB %03d.%03d\n", &maj, &min) != 2) {
+	vnc_client_error(vs);
+	return 0;
+    }
+
+    vnc_write_u32(vs, 1); /* None */
+    vnc_flush(vs);
+
+    vnc_read_when(vs, protocol_client_init, 1);
+
+    return 0;
+}
+
+static void vnc_listen_read(void *opaque)
+{
+    VncState *vs = opaque;
+    struct sockaddr_in addr;
+    socklen_t addrlen = sizeof(addr);
+
+    vs->csock = accept(vs->lsock, (struct sockaddr *)&addr, &addrlen);
+    if (vs->csock != -1) {
+	fcntl(vs->csock, F_SETFL, O_NONBLOCK);
+	qemu_set_fd_handler2(vs->csock, NULL, vnc_client_read, NULL, opaque);
+	vnc_write(vs, "RFB 003.003\n", 12);
+	vnc_flush(vs);
+	vnc_read_when(vs, protocol_version, 12);
+	memset(vs->old_data, 0, vs->ds->linesize * vs->ds->height);
+	memset(vs->dirty_row, 0xFF, sizeof(vs->dirty_row));
+	vs->has_resize = 0;
+	vs->has_hextile = 0;
+	vs->ds->dpy_copy = NULL;
+    }
+}
+
+void vnc_display_init(DisplayState *ds, int display)
+{
+    struct sockaddr_in addr;
+    int reuse_addr, ret;
+    VncState *vs;
+
+    vs = qemu_mallocz(sizeof(VncState));
+    if (!vs)
+	exit(1);
+
+    ds->opaque = vs;
+
+    vs->lsock = -1;
+    vs->csock = -1;
+    vs->depth = 4;
+
+    vs->ds = ds;
+
+    if (!keyboard_layout)
+	keyboard_layout = "en-us";
+
+    vs->kbd_layout = init_keyboard_layout(keyboard_layout);
+    if (!vs->kbd_layout)
+	exit(1);
+
+    vs->lsock = socket(PF_INET, SOCK_STREAM, 0);
+    if (vs->lsock == -1) {
+	fprintf(stderr, "Could not create socket\n");
+	exit(1);
+    }
+
+    addr.sin_family = AF_INET;
+    addr.sin_port = htons(5900 + display);
+    memset(&addr.sin_addr, 0, sizeof(addr.sin_addr));
+
+    reuse_addr = 1;
+    ret = setsockopt(vs->lsock, SOL_SOCKET, SO_REUSEADDR,
+		     &reuse_addr, sizeof(reuse_addr));
+    if (ret == -1) {
+	fprintf(stderr, "setsockopt() failed\n");
+	exit(1);
+    }
+
+    if (bind(vs->lsock, (struct sockaddr *)&addr, sizeof(addr)) == -1) {
+	fprintf(stderr, "bind() failed\n");
+	exit(1);
+    }
+
+    if (listen(vs->lsock, 1) == -1) {
+	fprintf(stderr, "listen() failed\n");
+	exit(1);
+    }
+
+    ret = qemu_set_fd_handler2(vs->lsock, vnc_listen_poll, vnc_listen_read, NULL, vs);
+    if (ret == -1) {
+	exit(1);
+    }
+
+    vs->ds->data = NULL;
+    vs->ds->dpy_update = vnc_dpy_update;
+    vs->ds->dpy_resize = vnc_dpy_resize;
+    vs->ds->dpy_refresh = vnc_dpy_refresh;
+
+    memset(vs->dirty_row, 0xFF, sizeof(vs->dirty_row));
+
+    vnc_dpy_resize(vs->ds, 640, 400);
+}