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authorTim Hardeck <thardeck@suse.de>2013-01-21 11:04:44 +0100
committerAnthony Liguori <aliguori@us.ibm.com>2013-01-21 13:33:12 -0600
commit7536ee4bc3da7e9b7fdadba5ba6ade63eaace430 (patch)
treedd9818e015ffe360e5636066e987cdc8c91d9839 /ui/vnc-ws.h
parent32ed26808d4e59efb4a03290a4a85f5f8335f268 (diff)
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vnc: added initial websocket protocol support
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>
Diffstat (limited to 'ui/vnc-ws.h')
-rw-r--r--ui/vnc-ws.h86
1 files changed, 86 insertions, 0 deletions
diff --git a/ui/vnc-ws.h b/ui/vnc-ws.h
new file mode 100644
index 0000000..039a587
--- /dev/null
+++ b/ui/vnc-ws.h
@@ -0,0 +1,86 @@
+/*
+ * 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 */