include/io/channel-websock.h

   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 */