From ce3329047d378a14006ce74ec273ac59e3375303 Mon Sep 17 00:00:00 2001
From: Sebastian
Date: Wed, 12 May 2010 19:42:27 +0200
Subject: initial import of latest svn version

---
 src/net/pvsLocalhostCommunicator.cpp | 104 +++++++++++++++++++++++++++++++++++
 1 file changed, 104 insertions(+)
 create mode 100644 src/net/pvsLocalhostCommunicator.cpp

(limited to 'src/net/pvsLocalhostCommunicator.cpp')

diff --git a/src/net/pvsLocalhostCommunicator.cpp b/src/net/pvsLocalhostCommunicator.cpp
new file mode 100644
index 0000000..199b39c
--- /dev/null
+++ b/src/net/pvsLocalhostCommunicator.cpp
@@ -0,0 +1,104 @@
+#include "pvsLocalhostCommunicator.h"
+#include "src/util/consoleLogger.h"
+#include "src/net/pvsMsg.h"
+
+static QHostAddress localhost(QHostAddress::LocalHost);
+#define localport 14913
+
+PVSLocalhostCommunicator::PVSLocalhostCommunicator(QString path)
+{
+    _isServer = _isRunning = false;
+    _sock = NULL;
+}
+
+void PVSLocalhostCommunicator::run()
+{
+    if (_isRunning)
+        return;
+
+    // First try to run as server
+    _sock = new QUdpSocket();
+    // We'll bind only to localhost, so nobody else can send commands (from remote hosts)
+    // Otherwise we had to check the remote addr when receiving a datagram, but this
+    // wouldn't be as secure since you can easily fake it
+    _sock->bind(localhost, localport); // QUdpSocket::DontShareAddress? would need root
+    connect(_sock, SIGNAL(readyRead()), this, SLOT(sock_dataArrival()));
+
+    if (_sock->state() == QAbstractSocket::BoundState)
+    {
+        // OK, we are the first daemon to run
+        _isServer = true;
+        _isRunning = true;
+        return;
+    }
+    if (_sock->bind())
+    {
+        _isRunning = true;
+    }
+}
+
+void PVSLocalhostCommunicator::stop()
+{
+    _isRunning = false;
+    _sock->deleteLater();
+    _sock = NULL;
+}
+
+void PVSLocalhostCommunicator::sock_dataArrival()
+{
+    if (_sock == NULL) return;
+
+    qint64 dsize;
+    while ((dsize = _sock->pendingDatagramSize()) > -1)   // returns -1 if no more datagrams are pending
+    {
+        if (dsize < 4)   // anything shorter than 4 bytes is not a valid PVSMsg anyways, so take a shortcut
+        {
+            char x;
+            _sock->readDatagram(&x, 1, NULL, NULL);
+            continue; // discard the packet and see if there is more
+        }
+
+        PVSMsg receiver;
+        receiver.readMessage(_sock, true);
+
+        if (receiver.isMsgComplete())
+        {
+            // we received a message, so fire away
+            ConsoleLog writeNetwork(QString("Received UDS command: ").append(receiver.getIdent()));
+            _daemonDispatcher.fire(receiver.getIdent(), receiver);
+        } // If the msg is not complete we have to discard it, since UDP
+        // is packet oriented and we could not say for sure if the next one
+        // would be the continuation of this msg.
+        // Usually on the loopback interface it is safe to send datagrams
+        // up to 8kb, so this is not be an issue anyway.
+    }
+}
+
+void PVSLocalhostCommunicator::sendCommand(QString ident, QString cmd)
+{
+    if (_isRunning && !_isServer && _sock != NULL)
+    {
+        PVSMsg sender(PVSDAEMON, ident, cmd);
+        char *data;
+        int len;
+        sender.getBinaryData(data, len);
+        QByteArray qba(data, len);
+        printf("Sending %d bytes to daemon...\n", qba.length());
+        qint64 result = _sock->writeDatagram(qba, localhost, localport);
+        _sock->waitForBytesWritten(100);
+
+        // simply bail out on an error or disconnect or whatever
+        if (result != len)
+        {
+            if (result == -1)
+            {
+                printf("Error sending PVSMsg to daemon: %s\n", _sock->errorString().toUtf8().data());
+            }
+            else
+            {
+                printf("Sent PVSMsg was incomplete.\n");
+            }
+            stop();
+        }
+    }
+}
-- 
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