ui/vnc-ws.h

   1 /*
   2  * QEMU VNC display driver: Websockets support
   3  *
   4  * Copyright (C) 2010 Joel Martin
   5  * Copyright (C) 2012 Tim Hardeck
   6  *
   7  * This is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published by
   9  * the Free Software Foundation; either version 2 of the License, or
  10  * (at your option) any later version.
  11  *
  12  * This software is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with this software; if not, see <http://www.gnu.org/licenses/>.
  19  */
  20
  21 #ifndef __QEMU_UI_VNC_WS_H
  22 #define __QEMU_UI_VNC_WS_H
  23
  24 #include <gnutls/gnutls.h>
  25
  26 #define B64LEN(__x) (((__x + 2) / 3) * 12 / 3)
  27 #define SHA1_DIGEST_LEN 20
  28
  29 #define WS_ACCEPT_LEN (B64LEN(SHA1_DIGEST_LEN) + 1)
  30 #define WS_CLIENT_KEY_LEN 24
  31 #define WS_GUID "258EAFA5-E914-47DA-95CA-C5AB0DC85B11"
  32 #define WS_GUID_LEN strlen(WS_GUID)
  33
  34 #define WS_HANDSHAKE "HTTP/1.1 101 Switching Protocols\r\n\
  35 Upgrade: websocket\r\n\
  36 Connection: Upgrade\r\n\
  37 Sec-WebSocket-Accept: %s\r\n\
  38 Sec-WebSocket-Protocol: binary\r\n\
  39 \r\n"
  40 #define WS_HANDSHAKE_DELIM "\r\n"
  41 #define WS_HANDSHAKE_END "\r\n\r\n"
  42 #define WS_SUPPORTED_VERSION "13"
  43
  44 #define WS_HEAD_MIN_LEN sizeof(uint16_t)
  45 #define WS_HEAD_MAX_LEN (WS_HEAD_MIN_LEN + sizeof(uint64_t) + sizeof(uint32_t))
  46
  47 typedef union WsMask {
  48     char c[4];
  49     uint32_t u;
  50 } WsMask;
  51
  52 typedef struct QEMU_PACKED WsHeader {
  53     unsigned char b0;
  54     unsigned char b1;
  55     union {
  56         struct QEMU_PACKED {
  57             uint16_t l16;
  58             WsMask m16;
  59         } s16;
  60         struct QEMU_PACKED {
  61             uint64_t l64;
  62             WsMask m64;
  63         } s64;
  64         WsMask m;
  65     } u;
  66 } WsHeader;
  67
  68 enum {
  69     WS_OPCODE_CONTINUATION = 0x0,
  70     WS_OPCODE_TEXT_FRAME = 0x1,
  71     WS_OPCODE_BINARY_FRAME = 0x2,
  72     WS_OPCODE_CLOSE = 0x8,
  73     WS_OPCODE_PING = 0x9,
  74     WS_OPCODE_PONG = 0xA
  75 };
  76
  77 #ifdef CONFIG_VNC_TLS
  78 void vncws_tls_handshake_io(void *opaque);
  79 #endif /* CONFIG_VNC_TLS */
  80 void vncws_handshake_read(void *opaque);
  81 long vnc_client_write_ws(VncState *vs);
  82 long vnc_client_read_ws(VncState *vs);
  83 void vncws_process_handshake(VncState *vs, uint8_t *line, size_t size);
  84 void vncws_encode_frame(Buffer *output, const void *payload,
  85             const size_t payload_size);
  86 int vncws_decode_frame_header(Buffer *input,
  87                               size_t *header_size,
  88                               size_t *payload_remain,
  89                               WsMask *payload_mask);
  90 int vncws_decode_frame_payload(Buffer *input,
  91                                size_t *payload_remain, WsMask *payload_mask,
  92                                uint8_t **payload, size_t *payload_size);
  93
  94 #endif /* __QEMU_UI_VNC_WS_H */