Import Upstream version 2.0.0+dfsgupstream/2.0.0+dfsg

1 files changed, 194 insertions, 0 deletions

diff --git a/src/lib/ipc/IpcClientProxy.cpp b/src/lib/ipc/IpcClientProxy.cpp
new file mode 100644
index 0000000..af85eca
--- /dev/null
+++ b/src/lib/ipc/IpcClientProxy.cpp
@@ -0,0 +1,194 @@
+/*
+ * barrier -- mouse and keyboard sharing utility
+ * Copyright (C) 2012-2016 Symless Ltd.
+ * Copyright (C) 2012 Nick Bolton
+ * 
+ * This package is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * found in the file LICENSE that should have accompanied this file.
+ * 
+ * This package 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/>.
+ */
+
+#include "ipc/IpcClientProxy.h"
+
+#include "ipc/Ipc.h"
+#include "ipc/IpcMessage.h"
+#include "barrier/ProtocolUtil.h"
+#include "io/IStream.h"
+#include "arch/Arch.h"
+#include "base/TMethodEventJob.h"
+#include "base/Log.h"
+
+//
+// IpcClientProxy
+//
+
+IpcClientProxy::IpcClientProxy(barrier::IStream& stream, IEventQueue* events) :
+    m_stream(stream),
+    m_clientType(kIpcClientUnknown),
+    m_disconnecting(false),
+    m_readMutex(ARCH->newMutex()),
+    m_writeMutex(ARCH->newMutex()),
+    m_events(events)
+{
+    m_events->adoptHandler(
+        m_events->forIStream().inputReady(), stream.getEventTarget(),
+        new TMethodEventJob<IpcClientProxy>(
+        this, &IpcClientProxy::handleData));
+
+    m_events->adoptHandler(
+        m_events->forIStream().outputError(), stream.getEventTarget(),
+        new TMethodEventJob<IpcClientProxy>(
+        this, &IpcClientProxy::handleWriteError));
+
+    m_events->adoptHandler(
+        m_events->forIStream().inputShutdown(), stream.getEventTarget(),
+        new TMethodEventJob<IpcClientProxy>(
+        this, &IpcClientProxy::handleDisconnect));
+
+    m_events->adoptHandler(
+        m_events->forIStream().outputShutdown(), stream.getEventTarget(),
+        new TMethodEventJob<IpcClientProxy>(
+        this, &IpcClientProxy::handleWriteError));
+}
+
+IpcClientProxy::~IpcClientProxy()
+{
+    m_events->removeHandler(
+        m_events->forIStream().inputReady(), m_stream.getEventTarget());
+    m_events->removeHandler(
+        m_events->forIStream().outputError(), m_stream.getEventTarget());
+    m_events->removeHandler(
+        m_events->forIStream().inputShutdown(), m_stream.getEventTarget());
+    m_events->removeHandler(
+        m_events->forIStream().outputShutdown(), m_stream.getEventTarget());
+    
+    // don't delete the stream while it's being used.
+    ARCH->lockMutex(m_readMutex);
+    ARCH->lockMutex(m_writeMutex);
+    delete &m_stream;
+    ARCH->unlockMutex(m_readMutex);
+    ARCH->unlockMutex(m_writeMutex);
+
+    ARCH->closeMutex(m_readMutex);
+    ARCH->closeMutex(m_writeMutex);
+}
+
+void
+IpcClientProxy::handleDisconnect(const Event&, void*)
+{
+    disconnect();
+    LOG((CLOG_DEBUG "ipc client disconnected"));
+}
+
+void
+IpcClientProxy::handleWriteError(const Event&, void*)
+{
+    disconnect();
+    LOG((CLOG_DEBUG "ipc client write error"));
+}
+
+void
+IpcClientProxy::handleData(const Event&, void*)
+{
+    // don't allow the dtor to destroy the stream while we're using it.
+    ArchMutexLock lock(m_readMutex);
+
+    LOG((CLOG_DEBUG "start ipc handle data"));
+
+    UInt8 code[4];
+    UInt32 n = m_stream.read(code, 4);
+    while (n != 0) {
+
+        LOG((CLOG_DEBUG "ipc read: %c%c%c%c",
+            code[0], code[1], code[2], code[3]));
+
+        IpcMessage* m = nullptr;
+        if (memcmp(code, kIpcMsgHello, 4) == 0) {
+            m = parseHello();
+        }
+        else if (memcmp(code, kIpcMsgCommand, 4) == 0) {
+            m = parseCommand();
+        }
+        else {
+            LOG((CLOG_ERR "invalid ipc message"));
+            disconnect();
+        }
+
+        // don't delete with this event; the data is passed to a new event.
+        Event e(m_events->forIpcClientProxy().messageReceived(), this, NULL, Event::kDontFreeData);
+        e.setDataObject(m);
+        m_events->addEvent(e);
+
+        n = m_stream.read(code, 4);
+    }
+
+    LOG((CLOG_DEBUG "finished ipc handle data"));
+}
+
+void
+IpcClientProxy::send(const IpcMessage& message)
+{
+    // don't allow other threads to write until we've finished the entire
+    // message. stream write is locked, but only for that single write.
+    // also, don't allow the dtor to destroy the stream while we're using it.
+    ArchMutexLock lock(m_writeMutex);
+
+    LOG((CLOG_DEBUG4 "ipc write: %d", message.type()));
+
+    switch (message.type()) {
+    case kIpcLogLine: {
+        const IpcLogLineMessage& llm = static_cast<const IpcLogLineMessage&>(message);
+        const String logLine = llm.logLine();
+        ProtocolUtil::writef(&m_stream, kIpcMsgLogLine, &logLine);
+        break;
+    }
+            
+    case kIpcShutdown:
+        ProtocolUtil::writef(&m_stream, kIpcMsgShutdown);
+        break;
+
+    default:
+        LOG((CLOG_ERR "ipc message not supported: %d", message.type()));
+        break;
+    }
+}
+
+IpcHelloMessage*
+IpcClientProxy::parseHello()
+{
+    UInt8 type;
+    ProtocolUtil::readf(&m_stream, kIpcMsgHello + 4, &type);
+
+    m_clientType = static_cast<EIpcClientType>(type);
+
+    // must be deleted by event handler.
+    return new IpcHelloMessage(m_clientType);
+}
+
+IpcCommandMessage*
+IpcClientProxy::parseCommand()
+{
+    String command;
+    UInt8 elevate;
+    ProtocolUtil::readf(&m_stream, kIpcMsgCommand + 4, &command, &elevate);
+
+    // must be deleted by event handler.
+    return new IpcCommandMessage(command, elevate != 0);
+}
+
+void
+IpcClientProxy::disconnect()
+{
+    LOG((CLOG_DEBUG "ipc disconnect, closing stream"));
+    m_disconnecting = true;
+    m_stream.close();
+    m_events->addEvent(Event(m_events->forIpcClientProxy().disconnected(), this));
+}