1 /* 2 * QEMU I/O channels driver websockets 3 * 4 * Copyright (c) 2015 Red Hat, Inc. 5 * 6 * This library is free software; you can redistribute it and/or 7 * modify it under the terms of the GNU Lesser General Public 8 * License as published by the Free Software Foundation; either 9 * version 2 of the License, or (at your option) any later version. 10 * 11 * This library is distributed in the hope that it will be useful, 12 * but WITHOUT ANY WARRANTY; without even the implied warranty of 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 14 * Lesser General Public License for more details. 15 * 16 * You should have received a copy of the GNU Lesser General Public 17 * License along with this library; if not, see <http://www.gnu.org/licenses/>. 18 * 19 */ 20 21 #ifndef QIO_CHANNEL_WEBSOCK_H__ 22 #define QIO_CHANNEL_WEBSOCK_H__ 23 24 #include "io/channel.h" 25 #include "qemu/buffer.h" 26 #include "io/task.h" 27 28 #define TYPE_QIO_CHANNEL_WEBSOCK "qio-channel-websock" 29 #define QIO_CHANNEL_WEBSOCK(obj) \ 30 OBJECT_CHECK(QIOChannelWebsock, (obj), TYPE_QIO_CHANNEL_WEBSOCK) 31 32 typedef struct QIOChannelWebsock QIOChannelWebsock; 33 typedef union QIOChannelWebsockMask QIOChannelWebsockMask; 34 35 union QIOChannelWebsockMask { 36 char c[4]; 37 uint32_t u; 38 }; 39 40 /** 41 * QIOChannelWebsock 42 * 43 * The QIOChannelWebsock class provides a channel wrapper which 44 * can transparently run the HTTP websockets protocol. This is 45 * usually used over a TCP socket, but there is actually no 46 * technical restriction on which type of master channel is 47 * used as the transport. 48 * 49 * This channel object is currently only capable of running as 50 * a websocket server and is a pretty crude implementation 51 * of it, not supporting the full websockets protocol feature 52 * set. It is sufficient to use with a simple websockets 53 * client for encapsulating VNC for noVNC in-browser client. 54 */ 55 56 struct QIOChannelWebsock { 57 QIOChannel parent; 58 QIOChannel *master; 59 Buffer encinput; 60 Buffer encoutput; 61 Buffer rawinput; 62 Buffer rawoutput; 63 size_t payload_remain; 64 QIOChannelWebsockMask mask; 65 guint io_tag; 66 Error *io_err; 67 gboolean io_eof; 68 }; 69 70 /** 71 * qio_channel_websock_new_server: 72 * @master: the underlying channel object 73 * 74 * Create a new websockets channel that runs the server 75 * side of the protocol. 76 * 77 * After creating the channel, it is mandatory to call 78 * the qio_channel_websock_handshake() method before attempting 79 * todo any I/O on the channel. 80 * 81 * Once the handshake has completed, all I/O should be done 82 * via the new websocket channel object and not the original 83 * master channel 84 * 85 * Returns: the new websockets channel object 86 */ 87 QIOChannelWebsock * 88 qio_channel_websock_new_server(QIOChannel *master); 89 90 /** 91 * qio_channel_websock_handshake: 92 * @ioc: the websocket channel object 93 * @func: the callback to invoke when completed 94 * @opaque: opaque data to pass to @func 95 * @destroy: optional callback to free @opaque 96 * 97 * Perform the websocket handshake. This method 98 * will return immediately and the handshake will 99 * continue in the background, provided the main 100 * loop is running. When the handshake is complete, 101 * or fails, the @func callback will be invoked. 102 */ 103 void qio_channel_websock_handshake(QIOChannelWebsock *ioc, 104 QIOTaskFunc func, 105 gpointer opaque, 106 GDestroyNotify destroy); 107 108 #endif /* QIO_CHANNEL_WEBSOCK_H__ */ 109