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/*

 * QEMU VNC display driver

 *

 * Copyright (C) 2006 Anthony Liguori <anthony@codemonkey.ws>

 * Copyright (C) 2006 Fabrice Bellard

 * Copyright (C) 2009 Red Hat, Inc

 *

 * Permission is hereby granted, free of charge, to any person obtaining a copy

 * of this software and associated documentation files (the "Software"), to deal

 * in the Software without restriction, including without limitation the rights

 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell

 * copies of the Software, and to permit persons to whom the Software is

 * furnished to do so, subject to the following conditions:

 *

 * The above copyright notice and this permission notice shall be included in

 * all copies or substantial portions of the Software.

 *

 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR

 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,

 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL

 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER

 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,

 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN

 * THE SOFTWARE.

 */

#ifndef __QEMU_VNC_H

#define __QEMU_VNC_H

#include "qemu-common.h"

#include "qemu-queue.h"

#ifdef CONFIG_VNC_THREAD

#include "qemu-thread.h"

#endif

#include "console.h"

#include "monitor.h"

#include "audio/audio.h"

#include <zlib.h>

#include <stdbool.h>

#include "keymaps.h"

// #define _VNC_DEBUG 1

#ifdef _VNC_DEBUG

#define VNC_DEBUG(fmt, ...) do { fprintf(stderr, fmt, ## __VA_ARGS__); } while (0)

#else

#define VNC_DEBUG(fmt, ...) do { } while (0)

#endif

/*****************************************************************************

 *

 * Core data structures

 *

 *****************************************************************************/

typedef struct Buffer

{

    size_t capacity;

    size_t offset;

    uint8_t *buffer;

} Buffer;

typedef struct VncState VncState;

typedef struct VncJob VncJob;

typedef struct VncRect VncRect;

typedef struct VncRectEntry VncRectEntry;

typedef int VncReadEvent(VncState *vs, uint8_t *data, size_t len);

typedef void VncWritePixels(VncState *vs, struct PixelFormat *pf, void *data, int size);

typedef void VncSendHextileTile(VncState *vs,

                                int x, int y, int w, int h,

                                void *last_bg,

                                void *last_fg,

                                int *has_bg, int *has_fg);

#define VNC_MAX_WIDTH 2560

#define VNC_MAX_HEIGHT 2048

#define VNC_DIRTY_WORDS (VNC_MAX_WIDTH / (16 * 32))

#define VNC_STAT_RECT  64

#define VNC_STAT_COLS (VNC_MAX_WIDTH / VNC_STAT_RECT)

#define VNC_STAT_ROWS (VNC_MAX_HEIGHT / VNC_STAT_RECT)

#define VNC_AUTH_CHALLENGE_SIZE 16

typedef struct VncDisplay VncDisplay;

#ifdef CONFIG_VNC_TLS

#include "vnc-tls.h"

#include "vnc-auth-vencrypt.h"

#endif

#ifdef CONFIG_VNC_SASL

#include "vnc-auth-sasl.h"

#endif

struct VncRectStat

{

    /* time of last 10 updates, to find update frequency */

    struct timeval times[10];

    int idx;

    double freq;        /* Update frequency (in Hz) */

    bool updated;       /* Already updated during this refresh */

};

typedef struct VncRectStat VncRectStat;

struct VncSurface

{

    struct timeval last_freq_check;

    uint32_t dirty[VNC_MAX_HEIGHT][VNC_DIRTY_WORDS];

    VncRectStat stats[VNC_STAT_ROWS][VNC_STAT_COLS];

    DisplaySurface *ds;

};

struct VncDisplay

{

    QTAILQ_HEAD(, VncState) clients;

    QEMUTimer *timer;

    int timer_interval;

    int lsock;

    DisplayState *ds;

    kbd_layout_t *kbd_layout;

    int lock_key_sync;

#ifdef CONFIG_VNC_THREAD

    QemuMutex mutex;

#endif

    QEMUCursor *cursor;

    int cursor_msize;

    uint8_t *cursor_mask;

    struct VncSurface guest;   /* guest visible surface (aka ds->surface) */

    DisplaySurface *server;  /* vnc server surface */

    char *display;

    char *password;

    time_t expires;

    int auth;

    bool lossy;

#ifdef CONFIG_VNC_TLS

    int subauth; /* Used by VeNCrypt */

    VncDisplayTLS tls;

#endif

#ifdef CONFIG_VNC_SASL

    VncDisplaySASL sasl;

#endif

};

typedef struct VncTight {

    int type;

    uint8_t quality;

    uint8_t compression;

    uint8_t pixel24;

    Buffer tight;

    Buffer tmp;

    Buffer zlib;

    Buffer gradient;

#ifdef CONFIG_VNC_JPEG

    Buffer jpeg;

#endif

#ifdef CONFIG_VNC_PNG

    Buffer png;

#endif

    int levels[4];

    z_stream stream[4];

} VncTight;

typedef struct VncHextile {

    VncSendHextileTile *send_tile;

} VncHextile;

typedef struct VncZlib {

    Buffer zlib;

    Buffer tmp;

    z_stream stream;

    int level;

} VncZlib;

#ifdef CONFIG_VNC_THREAD

struct VncRect

{

    int x;

    int y;

    int w;

    int h;

};

struct VncRectEntry

{

    struct VncRect rect;

    QLIST_ENTRY(VncRectEntry) next;

};

struct VncJob

{

    VncState *vs;

    QLIST_HEAD(, VncRectEntry) rectangles;

    QTAILQ_ENTRY(VncJob) next;

};

#else

struct VncJob

{

    VncState *vs;

    int rectangles;

    size_t saved_offset;

};

#endif

struct VncState

{

    int csock;

    DisplayState *ds;

    uint32_t dirty[VNC_MAX_HEIGHT][VNC_DIRTY_WORDS];

    VncDisplay *vd;

    int need_update;

    int force_update;

    uint32_t features;

    int absolute;

    int last_x;

    int last_y;

    int client_width;

    int client_height;

    uint32_t vnc_encoding;

    int major;

    int minor;

    char challenge[VNC_AUTH_CHALLENGE_SIZE];

#ifdef CONFIG_VNC_TLS

    VncStateTLS tls;

#endif

#ifdef CONFIG_VNC_SASL

    VncStateSASL sasl;

#endif

    QObject *info;

    Buffer output;

    Buffer input;

    /* current output mode information */

    VncWritePixels *write_pixels;

    DisplaySurface clientds;

    CaptureVoiceOut *audio_cap;

    struct audsettings as;

    VncReadEvent *read_handler;

    size_t read_handler_expect;

    /* input */

    uint8_t modifiers_state[256];

    QEMUPutLEDEntry *led;

    bool abort;

#ifndef CONFIG_VNC_THREAD

    VncJob job;

#else

    QemuMutex output_mutex;

#endif

    /* Encoding specific, if you add something here, don't forget to

     *  update vnc_async_encoding_start()

     */

    VncTight tight;

    VncZlib zlib;

    VncHextile hextile;

    Notifier mouse_mode_notifier;

    QTAILQ_ENTRY(VncState) next;

};

/*****************************************************************************

 *

 * Authentication modes

 *

 *****************************************************************************/

enum {

    VNC_AUTH_INVALID = 0,

    VNC_AUTH_NONE = 1,

    VNC_AUTH_VNC = 2,

    VNC_AUTH_RA2 = 5,

    VNC_AUTH_RA2NE = 6,

    VNC_AUTH_TIGHT = 16,

    VNC_AUTH_ULTRA = 17,

    VNC_AUTH_TLS = 18,      /* Supported in GTK-VNC & VINO */

    VNC_AUTH_VENCRYPT = 19, /* Supported in GTK-VNC & VeNCrypt */

    VNC_AUTH_SASL = 20,     /* Supported in GTK-VNC & VINO */

};

enum {

    VNC_AUTH_VENCRYPT_PLAIN = 256,

    VNC_AUTH_VENCRYPT_TLSNONE = 257,

    VNC_AUTH_VENCRYPT_TLSVNC = 258,

    VNC_AUTH_VENCRYPT_TLSPLAIN = 259,

    VNC_AUTH_VENCRYPT_X509NONE = 260,

    VNC_AUTH_VENCRYPT_X509VNC = 261,

    VNC_AUTH_VENCRYPT_X509PLAIN = 262,

    VNC_AUTH_VENCRYPT_X509SASL = 263,

    VNC_AUTH_VENCRYPT_TLSSASL = 264,

};

/*****************************************************************************

 *

 * Encoding types

 *

 *****************************************************************************/

#define VNC_ENCODING_RAW                  0x00000000

#define VNC_ENCODING_COPYRECT             0x00000001

#define VNC_ENCODING_RRE                  0x00000002

#define VNC_ENCODING_CORRE                0x00000004

#define VNC_ENCODING_HEXTILE              0x00000005

#define VNC_ENCODING_ZLIB                 0x00000006

#define VNC_ENCODING_TIGHT                0x00000007

#define VNC_ENCODING_ZLIBHEX              0x00000008

#define VNC_ENCODING_TRLE                 0x0000000f

#define VNC_ENCODING_ZRLE                 0x00000010

#define VNC_ENCODING_ZYWRLE               0x00000011

#define VNC_ENCODING_COMPRESSLEVEL0       0xFFFFFF00 /* -256 */

#define VNC_ENCODING_QUALITYLEVEL0        0xFFFFFFE0 /* -32  */

#define VNC_ENCODING_XCURSOR              0xFFFFFF10 /* -240 */

#define VNC_ENCODING_RICH_CURSOR          0xFFFFFF11 /* -239 */

#define VNC_ENCODING_POINTER_POS          0xFFFFFF18 /* -232 */

#define VNC_ENCODING_LASTRECT             0xFFFFFF20 /* -224 */

#define VNC_ENCODING_DESKTOPRESIZE        0xFFFFFF21 /* -223 */

#define VNC_ENCODING_POINTER_TYPE_CHANGE  0XFFFFFEFF /* -257 */

#define VNC_ENCODING_EXT_KEY_EVENT        0XFFFFFEFE /* -258 */

#define VNC_ENCODING_AUDIO                0XFFFFFEFD /* -259 */

#define VNC_ENCODING_TIGHT_PNG            0xFFFFFEFC /* -260 */

#define VNC_ENCODING_WMVi                 0x574D5669

/*****************************************************************************

 *

 * Other tight constants

 *

 *****************************************************************************/

/*

 * Vendors known by TightVNC: standard VNC/RealVNC, TridiaVNC, and TightVNC.

 */

#define VNC_TIGHT_CCB_RESET_MASK   (0x0f)

#define VNC_TIGHT_CCB_TYPE_MASK    (0x0f << 4)

#define VNC_TIGHT_CCB_TYPE_FILL    (0x08 << 4)

#define VNC_TIGHT_CCB_TYPE_JPEG    (0x09 << 4)

#define VNC_TIGHT_CCB_TYPE_PNG     (0x0A << 4)

#define VNC_TIGHT_CCB_BASIC_MAX    (0x07 << 4)

#define VNC_TIGHT_CCB_BASIC_ZLIB   (0x03 << 4)

#define VNC_TIGHT_CCB_BASIC_FILTER (0x04 << 4)

/*****************************************************************************

 *

 * Features

 *

 *****************************************************************************/

#define VNC_FEATURE_RESIZE                   0

#define VNC_FEATURE_HEXTILE                  1

#define VNC_FEATURE_POINTER_TYPE_CHANGE      2

#define VNC_FEATURE_WMVI                     3

#define VNC_FEATURE_TIGHT                    4

#define VNC_FEATURE_ZLIB                     5

#define VNC_FEATURE_COPYRECT                 6

#define VNC_FEATURE_RICH_CURSOR              7

#define VNC_FEATURE_TIGHT_PNG                8

#define VNC_FEATURE_RESIZE_MASK              (1 << VNC_FEATURE_RESIZE)

#define VNC_FEATURE_HEXTILE_MASK             (1 << VNC_FEATURE_HEXTILE)

#define VNC_FEATURE_POINTER_TYPE_CHANGE_MASK (1 << VNC_FEATURE_POINTER_TYPE_CHANGE)

#define VNC_FEATURE_WMVI_MASK                (1 << VNC_FEATURE_WMVI)

#define VNC_FEATURE_TIGHT_MASK               (1 << VNC_FEATURE_TIGHT)

#define VNC_FEATURE_ZLIB_MASK                (1 << VNC_FEATURE_ZLIB)

#define VNC_FEATURE_COPYRECT_MASK            (1 << VNC_FEATURE_COPYRECT)

#define VNC_FEATURE_RICH_CURSOR_MASK         (1 << VNC_FEATURE_RICH_CURSOR)

#define VNC_FEATURE_TIGHT_PNG_MASK           (1 << VNC_FEATURE_TIGHT_PNG)

/* Client -> Server message IDs */

#define VNC_MSG_CLIENT_SET_PIXEL_FORMAT           0

#define VNC_MSG_CLIENT_SET_ENCODINGS              2

#define VNC_MSG_CLIENT_FRAMEBUFFER_UPDATE_REQUEST 3

#define VNC_MSG_CLIENT_KEY_EVENT                  4

#define VNC_MSG_CLIENT_POINTER_EVENT              5

#define VNC_MSG_CLIENT_CUT_TEXT                   6

#define VNC_MSG_CLIENT_VMWARE_0                   127

#define VNC_MSG_CLIENT_CALL_CONTROL               249

#define VNC_MSG_CLIENT_XVP                        250

#define VNC_MSG_CLIENT_SET_DESKTOP_SIZE           251

#define VNC_MSG_CLIENT_TIGHT                      252

#define VNC_MSG_CLIENT_GII                        253

#define VNC_MSG_CLIENT_VMWARE_1                   254

#define VNC_MSG_CLIENT_QEMU                       255

/* Server -> Client message IDs */

#define VNC_MSG_SERVER_FRAMEBUFFER_UPDATE         0

#define VNC_MSG_SERVER_SET_COLOUR_MAP_ENTRIES     1

#define VNC_MSG_SERVER_BELL                       2

#define VNC_MSG_SERVER_CUT_TEXT                   3

#define VNC_MSG_SERVER_VMWARE_0                   127

#define VNC_MSG_SERVER_CALL_CONTROL               249

#define VNC_MSG_SERVER_XVP                        250

#define VNC_MSG_SERVER_TIGHT                      252

#define VNC_MSG_SERVER_GII                        253

#define VNC_MSG_SERVER_VMWARE_1                   254

#define VNC_MSG_SERVER_QEMU                       255

/* QEMU client -> server message IDs */

#define VNC_MSG_CLIENT_QEMU_EXT_KEY_EVENT         0

#define VNC_MSG_CLIENT_QEMU_AUDIO                 1

/* QEMU server -> client message IDs */

#define VNC_MSG_SERVER_QEMU_AUDIO                 1

/* QEMU client -> server audio message IDs */

#define VNC_MSG_CLIENT_QEMU_AUDIO_ENABLE          0

#define VNC_MSG_CLIENT_QEMU_AUDIO_DISABLE         1

#define VNC_MSG_CLIENT_QEMU_AUDIO_SET_FORMAT      2

/* QEMU server -> client audio message IDs */

#define VNC_MSG_SERVER_QEMU_AUDIO_END             0

#define VNC_MSG_SERVER_QEMU_AUDIO_BEGIN           1

#define VNC_MSG_SERVER_QEMU_AUDIO_DATA            2

/*****************************************************************************

 *

 * Internal APIs

 *

 *****************************************************************************/

/* Event loop functions */

void vnc_client_read(void *opaque);

void vnc_client_write(void *opaque);

long vnc_client_read_buf(VncState *vs, uint8_t *data, size_t datalen);

long vnc_client_write_buf(VncState *vs, const uint8_t *data, size_t datalen);

/* Protocol I/O functions */

void vnc_write(VncState *vs, const void *data, size_t len);

void vnc_write_u32(VncState *vs, uint32_t value);

void vnc_write_s32(VncState *vs, int32_t value);

void vnc_write_u16(VncState *vs, uint16_t value);

void vnc_write_u8(VncState *vs, uint8_t value);

void vnc_flush(VncState *vs);

void vnc_read_when(VncState *vs, VncReadEvent *func, size_t expecting);

/* Buffer I/O functions */

uint8_t read_u8(uint8_t *data, size_t offset);

uint16_t read_u16(uint8_t *data, size_t offset);

int32_t read_s32(uint8_t *data, size_t offset);

uint32_t read_u32(uint8_t *data, size_t offset);

/* Protocol stage functions */

void vnc_client_error(VncState *vs);

int vnc_client_io_error(VncState *vs, int ret, int last_errno);

void start_client_init(VncState *vs);

void start_auth_vnc(VncState *vs);

/* Buffer management */

void buffer_reserve(Buffer *buffer, size_t len);

int buffer_empty(Buffer *buffer);

uint8_t *buffer_end(Buffer *buffer);

void buffer_reset(Buffer *buffer);

void buffer_free(Buffer *buffer);

void buffer_append(Buffer *buffer, const void *data, size_t len);

/* Misc helpers */

char *vnc_socket_local_addr(const char *format, int fd);

char *vnc_socket_remote_addr(const char *format, int fd);

static inline uint32_t vnc_has_feature(VncState *vs, int feature) {

    return (vs->features & (1 << feature));

}

/* Framebuffer */

void vnc_framebuffer_update(VncState *vs, int x, int y, int w, int h,

                            int32_t encoding);

void vnc_convert_pixel(VncState *vs, uint8_t *buf, uint32_t v);

double vnc_update_freq(VncState *vs, int x, int y, int w, int h);

/* Encodings */

int vnc_send_framebuffer_update(VncState *vs, int x, int y, int w, int h);

int vnc_raw_send_framebuffer_update(VncState *vs, int x, int y, int w, int h);

int vnc_hextile_send_framebuffer_update(VncState *vs, int x,

                                         int y, int w, int h);

void vnc_hextile_set_pixel_conversion(VncState *vs, int generic);

void *vnc_zlib_zalloc(void *x, unsigned items, unsigned size);

void vnc_zlib_zfree(void *x, void *addr);

int vnc_zlib_send_framebuffer_update(VncState *vs, int x, int y, int w, int h);

void vnc_zlib_clear(VncState *vs);

int vnc_tight_send_framebuffer_update(VncState *vs, int x, int y, int w, int h);

int vnc_tight_png_send_framebuffer_update(VncState *vs, int x, int y,

                                          int w, int h);

void vnc_tight_clear(VncState *vs);

#endif /* __QEMU_VNC_H */