206 lines
5.1 KiB
C
206 lines
5.1 KiB
C
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/* -*- c-basic-offset: 8 -*-
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rdesktop: A Remote Desktop Protocol client.
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Communication between different rdesktop processes using X properties
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Copyright (C) Erik Forsberg <forsberg@cendio.se> 2003
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include <X11/Xlib.h>
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#include <X11/Xatom.h>
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#include "rdesktop.h"
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#include "xproto.h"
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Atom ipc_atom;
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extern Display *display;
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extern Window wnd;
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static struct stream in;
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static struct stream out;
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static const uint16 headerlen = 12;
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struct _ipc_channel;
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typedef struct _ipc_channel
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{
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uint16 messagetype;
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void (*callback) (unsigned char *, uint16 length);
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struct _ipc_channel *next;
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}
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ipc_channel;
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static ipc_channel *ipc_channels = NULL;
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void
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ipc_register_ipcnotify(uint16 messagetype, void (*notifycallback) (unsigned char *, uint16))
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{
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ipc_channel *this;
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if (NULL != ipc_channels)
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{
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this = ipc_channels;
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while (NULL != this->next)
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this = this->next;
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this->next = xmalloc(sizeof(ipc_channel));
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this->next->next = NULL;
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this = this->next;
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}
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else
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{
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this = xmalloc(sizeof(ipc_channel));
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this->next = NULL;
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ipc_channels = this;
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}
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this->messagetype = messagetype;
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this->callback = notifycallback;
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}
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void
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ipc_deregister_ipcnotify(uint16 messagetype)
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{
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ipc_channel *this, *prev;
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prev = this = ipc_channels;
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while (NULL != this)
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{
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if (this->messagetype == messagetype)
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{
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if (prev == this)
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ipc_channels = this->next;
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else
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prev->next = this->next;
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xfree(this);
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return;
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}
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}
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}
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void
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ipc_recv_message(XPropertyEvent * xev)
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{
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int actual_format_return;
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unsigned long nitems_return, bytes_after_return;
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unsigned char *prop_return;
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unsigned char *data = NULL;
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uint16 totalsize, rdesktop_ipc_version, messagetype;
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uint32 sender_wnd;
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Atom actual_type_return;
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ipc_channel *channel = ipc_channels;
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DEBUG_RDP5(("Got event in ipc_recv_message\n"));
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in.end = in.p = in.data;
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XGetWindowProperty(display, DefaultRootWindow(display), ipc_atom, 0, 1, False, // Delete
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AnyPropertyType,
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&actual_type_return,
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&actual_format_return,
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&nitems_return, &bytes_after_return, &prop_return);
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memcpy(in.end, prop_return, 2);
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XFree(prop_return);
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in_uint32_le(&in, totalsize);
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in.end += 4;
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DEBUG_RDP5(("ipc totalsize is %d\n", totalsize));
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XGetWindowProperty(display, DefaultRootWindow(display), ipc_atom, 1, (totalsize - 1) / 4, False, // Delete
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AnyPropertyType,
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&actual_type_return,
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&actual_format_return,
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&nitems_return, &bytes_after_return, &prop_return);
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memcpy(in.end, prop_return, totalsize - 4);
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XFree(prop_return);
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in_uint16_le(&in, rdesktop_ipc_version);
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DEBUG_RDP5(("Got rdesktop_ipc_version %d\n", rdesktop_ipc_version));
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if (rdesktop_ipc_version > RDESKTOP_IPC_VERSION)
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{
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warning("IPC version of sending Rdesktop is higher than ours. Returning without trying to parse message\n");
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return;
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}
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in_uint16_le(&in, messagetype);
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in_uint32_le(&in, sender_wnd);
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DEBUG_RDP5(("header: %d, %d, %d\n", rdesktop_ipc_version, messagetype, sender_wnd));
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if (sender_wnd == wnd)
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{
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DEBUG_RDP5(("We sent this message, returning..\n"));
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return; /* We are not interested in our own events.. */
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}
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DEBUG_RDP5(("Not our window..\n"));
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/* Check if we are interested by traversing our callback list */
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while (NULL != channel)
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{
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DEBUG_RDP5(("Found channel for messagetype %d\n", channel->messagetype));
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if (messagetype == channel->messagetype)
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{
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data = xmalloc(in.size - headerlen);
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in_uint8p(&in, data, totalsize - headerlen);
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channel->callback(data, totalsize - headerlen);
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return;
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}
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/* Callback is responsible for freeing data */
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channel = channel->next;
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}
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}
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void
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ipc_init(void)
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{
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ipc_atom = XInternAtom(display, "_RDESKTOP_IPC", False);
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xwin_register_propertynotify(DefaultRootWindow(display), ipc_atom, ipc_recv_message);
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in.size = 4096;
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in.data = xmalloc(in.size);
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out.size = 4096;
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out.data = xmalloc(out.size);
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}
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void
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ipc_send_message(uint16 messagetype, unsigned char *data, uint16 length)
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{
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if ((length + headerlen) > out.size)
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{
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out.data = xrealloc(out.data, length + headerlen);
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out.size = length + headerlen;
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}
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out.p = out.data;
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out.end = out.data + out.size;
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out_uint32_le(&out, length + headerlen);
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out_uint16_le(&out, RDESKTOP_IPC_VERSION);
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out_uint16_le(&out, messagetype);
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out_uint32_le(&out, wnd);
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out_uint8p(&out, data, length);
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s_mark_end(&out);
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DEBUG_RDP5(("length+headerlen is %d\n", length + headerlen));
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XChangeProperty(display,
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DefaultRootWindow(display),
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ipc_atom, XA_STRING, 8, PropModeReplace, out.data, out.end - out.data);
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XFlush(display);
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}
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