kwin/client_machine.h
Martin Gräßlin 5cd223f051 Improved resolving whether a window is on local machine
Most windows use the hostname in WM_CLIENT_MACHINE, but there are windows
using the FQDN (for example libreoffice). So instead of "foo" it is
"foo.local.net" or similar. The logic so far has been unable to properly
determine whether windows with FQDN are on the local system.

In order to solve this problem the handling is split out into an own
class which stores the information of hostname and whether it is a local
machine. This is to not query multiple times. To determine whether the
Client is on the local system getaddrinfo is used for the own hostname
and the FQDN provided in WM_CLIENT_MACHINE. If one of the queried
names matches, we know that it is on the local machine. The old logic to
compare the hostname is still used and getaddrinfo is only a fallback in
case hostname does not match.

The problem with getaddrinfo is, that it accesses the network and by that
could block. To circumvent this problem the calls are moved into threads
by using QtConcurrent::run.

Obviously this brings disadvantages. When trying to resolve whether a
Client is on the local machine and a FQDN is used, the information is
initially wrong. The new ClientMachine class emits a signal when the
information that the system is local becomes available, but for some
things this is just too late:
* window rules are already gathered
* Session Management has already taken place

In both cases this is an acceptable loss. For window rules it just needs
a proper matching of the machine in case of localhost (remote hosts are
not affected). And the case of session management is very academic as it
is unlikely that a restoring session contains remote windows.

BUG: 308391
FIXED-IN: 4.11
REVIEW: 108235
2013-01-21 16:00:49 +01:00

117 lines
2.6 KiB
C++

/********************************************************************
KWin - the KDE window manager
This file is part of the KDE project.
Copyright (C) 2013 Martin Gräßlin <mgraesslin@kde.org>
This program 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 program 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 program. If not, see <http://www.gnu.org/licenses/>.
*********************************************************************/
#ifndef KWIN_CLIENT_MACHINE_H
#define KWIN_CLIENT_MACHINE_H
#include <QObject>
#include <xcb/xcb.h>
// forward declaration
struct addrinfo;
template <typename T>
class QFutureWatcher;
namespace KWin {
class GetAddrInfo : public QObject
{
Q_OBJECT
public:
explicit GetAddrInfo(const QByteArray &hostName, QObject *parent = NULL);
virtual ~GetAddrInfo();
void resolve();
Q_SIGNALS:
void local();
private Q_SLOTS:
void slotResolved();
void slotOwnAddressResolved();
private:
void compare();
bool resolved(QFutureWatcher<int> *watcher);
bool m_resolving;
bool m_resolved;
bool m_ownResolved;
QByteArray m_hostName;
addrinfo *m_addressHints;
addrinfo *m_address;
addrinfo *m_ownAddress;
QFutureWatcher<int> *m_watcher;
QFutureWatcher<int> *m_ownAddressWatcher;
};
class ClientMachine : public QObject
{
Q_OBJECT
public:
explicit ClientMachine(QObject *parent = NULL);
virtual ~ClientMachine();
void resolve(xcb_window_t window, xcb_window_t clientLeader);
const QByteArray &hostName() const;
bool isLocal() const;
static QByteArray localhost();
bool isResolving() const;
Q_SIGNALS:
void localhostChanged();
private Q_SLOTS:
void setLocal();
void resolveFinished();
private:
void checkForLocalhost();
QByteArray m_hostName;
bool m_localhost;
bool m_resolved;
bool m_resolving;
};
inline
bool ClientMachine::isLocal() const
{
return m_localhost;
}
inline
const QByteArray &ClientMachine::hostName() const
{
return m_hostName;
}
inline
QByteArray ClientMachine::localhost()
{
return "localhost";
}
inline
bool ClientMachine::isResolving() const
{
return m_resolving;
}
} // namespace
#endif