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vnc: added initial websocket protocol support

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This patch adds basic Websocket Protocol version 13 - RFC 6455 - support
to QEMU VNC. Binary encoding support on the client side is mandatory.

Because of the GnuTLS requirement the Websockets implementation is
optional (--enable-vnc-ws).

To activate Websocket support the VNC option "websocket"is used, for
example "-vnc :0,websocket".
The listen port for Websocket connections is (5700 + display) so if
QEMU VNC is started with :0 the Websocket port would be 5700.
As an alternative the Websocket port could be manually specified by
using ",websocket=<port>" instead.

Parts of the implementation base on Anthony Liguori's QEMU Websocket
patch from 2010 and on Joel Martin's LibVNC Websocket implementation.

Signed-off-by: Tim Hardeck <thardeck@suse.de>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
This commit is contained in:
Tim Hardeck 2013-01-21 11:04:44 +01:00 • committed by Anthony Liguori
parent 32ed26808d
commit 7536ee4bc3
7 changed files with 591 additions and 21 deletions
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86
ui/vnc-ws.h Normal file
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/*
* QEMU VNC display driver: Websockets support
*
* Copyright (C) 2010 Joel Martin
* Copyright (C) 2012 Tim Hardeck
*
* This is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This software is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this software; if not, see <http://www.gnu.org/licenses/>.
*/
#ifndef __QEMU_UI_VNC_WS_H
#define __QEMU_UI_VNC_WS_H
#include <gnutls/gnutls.h>
#define B64LEN(__x) (((__x + 2) / 3) * 12 / 3)
#define SHA1_DIGEST_LEN 20
#define WS_ACCEPT_LEN (B64LEN(SHA1_DIGEST_LEN) + 1)
#define WS_CLIENT_KEY_LEN 24
#define WS_GUID "258EAFA5-E914-47DA-95CA-C5AB0DC85B11"
#define WS_GUID_LEN strlen(WS_GUID)
#define WS_HANDSHAKE "HTTP/1.1 101 Switching Protocols\r\n\
Upgrade: websocket\r\n\
Connection: Upgrade\r\n\
Sec-WebSocket-Accept: %s\r\n\
Sec-WebSocket-Protocol: binary\r\n\
\r\n"
#define WS_HANDSHAKE_DELIM "\r\n"
#define WS_HANDSHAKE_END "\r\n\r\n"
#define WS_SUPPORTED_VERSION "13"
#define WS_HEAD_MIN_LEN sizeof(uint16_t)
#define WS_HEAD_MAX_LEN (WS_HEAD_MIN_LEN + sizeof(uint64_t) + sizeof(uint32_t))
typedef union WsMask {
char c[4];
uint32_t u;
} WsMask;
typedef struct QEMU_PACKED WsHeader {
unsigned char b0;
unsigned char b1;
union {
struct QEMU_PACKED {
uint16_t l16;
WsMask m16;
} s16;
struct QEMU_PACKED {
uint64_t l64;
WsMask m64;
} s64;
WsMask m;
} u;
} WsHeader;
enum {
WS_OPCODE_CONTINUATION = 0x0,
WS_OPCODE_TEXT_FRAME = 0x1,
WS_OPCODE_BINARY_FRAME = 0x2,
WS_OPCODE_CLOSE = 0x8,
WS_OPCODE_PING = 0x9,
WS_OPCODE_PONG = 0xA
};
void vncws_handshake_read(void *opaque);
long vnc_client_write_ws(VncState *vs);
long vnc_client_read_ws(VncState *vs);
void vncws_process_handshake(VncState *vs, uint8_t *line, size_t size);
void vncws_encode_frame(Buffer *output, const void *payload,
const size_t payload_size);
int vncws_decode_frame(Buffer *input, uint8_t **payload,
size_t *payload_size, size_t *frame_size);
#endif /* __QEMU_UI_VNC_WS_H */