1 files changed, 89 insertions, 0 deletions
diff --git a/src/input/killX11Handler.cpp b/src/input/killX11Handler.cpp
new file mode 100644
index 0000000..7ac75a1
--- /dev/null
+++ b/src/input/killX11Handler.cpp
@@ -0,0 +1,89 @@
+/*
+ # Copyright (c) 2009 - OpenSLX Project, Computer Center University of Freiburg
+ #
+ # This program is free software distributed under the GPL version 2.
+ # See http://openslx.org/COPYING
+ #
+ # If you have any feedback please consult http://openslx.org/feedback and
+ # send your suggestions, praise, or complaints to feedback@openslx.org
+ #
+ # General information about OpenSLX can be found at http://openslx.org/
+ # --------------------------------------------------------------------------
+ # killX11Handler.h
+ #  - Kill the X11 Server - implementation
+ # --------------------------------------------------------------------------
+ */
+
+#include <sys/types.h>
+#include <signal.h>
+#include <cerrno>
+#include <QDir>
+#include <QFileInfo>
+#include <QStringList>
+#include "pvsCheckPrivileges.h"
+#include "killX11Handler.h"
+
+using namespace std;
+
+void KillX11Handler::handle(InputEvent const&, InputEventContext const* ctx)
+{
+	// Find out which display device is used:
+	QString displayDevice = PVSCheckPrivileges::instance()->getX11DisplayDevice(ctx);
+	QString displayDeviceAbs = QFileInfo(displayDevice).canonicalFilePath();
+
+	if(displayDevice.isNull())
+	{
+		qWarning("Can not kill X server for %d,%d,%d: No Display Device", ctx->getSenderPid(), ctx->getSenderUid(), ctx->getSenderGid());
+		return;
+	}
+
+	QList<pid_t> pids;
+
+	// Find all processes that have it opened:
+	QDir proc("/proc");
+	QFileInfoList entries = proc.entryInfoList(QDir::Dirs | QDir::NoDotAndDotDot);
+	foreach(QFileInfo fi, entries)
+	{
+		// We are only interested in numerical ids:
+		bool ok;
+		pid_t pid = fi.fileName().toUInt(&ok);
+		if(!ok)
+			continue;
+
+		// We have a pid. Now check open files:
+		QDir fds(QString("/proc/%1/fd").arg(pid));
+		qDebug("Searching for X server in %s", fds.absolutePath().toLocal8Bit().constData());
+		QFileInfoList fdfiles = fds.entryInfoList(QDir::Files);
+		foreach(QFileInfo fdfile, fdfiles)
+		{
+			qDebug("  Looking for terminal in %s", fdfile.absoluteFilePath().toLocal8Bit().constData());
+			QFileInfo fdTarget(fdfile.readLink());
+			if(fdTarget.canonicalFilePath() == displayDeviceAbs)
+			{
+				qDebug("  ... found");
+				pids << pid;
+			}
+		}
+	}
+
+	// If everything is well, we have exactly one pid:
+	if(pids.size() != 1)
+	{
+		QStringList pidStrs;
+		foreach(pid_t pid, pids)
+		{
+			pidStrs << QString::number(pid);
+		}
+
+		qWarning("Display device %s is open by multiple or zero processes (%s). We don't know which is X. Aborting.",
+				displayDeviceAbs.toLocal8Bit().constData(),
+				pidStrs.join(", ").toLocal8Bit().constData());
+		return;
+	}
+
+	// We found the PID for the X server. Now kill it.
+	QString exe = QFileInfo(QString("/proc/%1/exe").arg(pids[0])).readLink();
+	qDebug("Killing X server, PID %d, exe name %s with SIGTERM", pids[0], exe.toLocal8Bit().constData());
+
+//	kill(pids[0], SIGTERM);
+}