Improve the broadcast ping mechanism and always run that as first thing.

networkdetector/broadcastping.cpp

@@ -0,0 +1,51 @@
+#include "broadcastping.h"
+#include "extern-plugininfo.h"
+
+#include <QNetworkInterface>
+#include <QProcess>
+
+BroadcastPing::BroadcastPing(QObject *parent) : QObject(parent)
+{
+
+}
+
+void BroadcastPing::run()
+{
+    qDeleteAll(m_runningPings.keys());
+    m_runningPings.clear();
+
+    foreach (const QNetworkInterface &interface, QNetworkInterface::allInterfaces()) {
+        if (!interface.flags().testFlag(QNetworkInterface::IsUp) || !interface.flags().testFlag(QNetworkInterface::CanBroadcast) || interface.flags().testFlag(QNetworkInterface::IsLoopBack)) {
+            continue;
+        }
+        foreach (const QNetworkAddressEntry &addressEntry, interface.addressEntries()) {
+            if (addressEntry.broadcast().isNull()) {
+                continue;
+            }
+            qCDebug(dcNetworkDetector()) << "Sending Broadcast Ping on" << addressEntry.broadcast().toString() + '/' + QString::number(addressEntry.prefixLength()) + "...";
+            QProcess *p = new QProcess(this);
+            m_runningPings.insert(p, addressEntry);
+            p->start("fping", {"-a", "-c", "1", "-g", addressEntry.broadcast().toString() + "/" + QString::number(addressEntry.prefixLength())});
+            connect(p, SIGNAL(finished(int)), this, SLOT(broadcastPingFinished(int)));
+        }
+    }
+    if (m_runningPings.isEmpty()) {
+        qCWarning(dcNetworkDetector()) << "Cound not find any suitable interface for broadcast pinging";
+        emit finished();
+    }
+}
+
+void BroadcastPing::broadcastPingFinished(int exitCode)
+{
+    Q_UNUSED(exitCode);
+    QProcess *p = static_cast<QProcess*>(sender());
+    QNetworkAddressEntry addressEntry = m_runningPings.take(p);
+    qCDebug(dcNetworkDetector()) << "Broadcast ping finished for network" << addressEntry.broadcast().toString() + '/' + QString::number(addressEntry.prefixLength());
+//        qCDebug(dcNetworkDetector()) << p->readAllStandardError();
+    p->deleteLater();
+
+    if (m_runningPings.isEmpty()) {
+        qCDebug(dcNetworkDetector()) << "All broadcast pings finished";
+        emit finished();
+    }
+}

networkdetector/broadcastping.h

@@ -0,0 +1,28 @@
+#ifndef BROADCASTPING_H
+#define BROADCASTPING_H
+
+#include <QObject>
+#include <QHash>
+#include <QProcess>
+#include <QNetworkAddressEntry>
+
+class BroadcastPing : public QObject
+{
+    Q_OBJECT
+public:
+    explicit BroadcastPing(QObject *parent = nullptr);
+
+signals:
+    void finished();
+
+public slots:
+    void run();
+
+private slots:
+    void broadcastPingFinished(int exitCode);
+
+private:
+    QHash<QProcess*, QNetworkAddressEntry> m_runningPings;
+};
+
+#endif // BROADCASTPING_H

networkdetector/devicemonitor.cpp

@@ -62,7 +62,13 @@ void DeviceMonitor::arpLookupFinished(int exitCode)
         line.replace(QRegExp("[ ]{1,}"), " ");
         QStringList parts = line.split(" ");
         int lladdrIndex = parts.indexOf("lladdr");
-        if (lladdrIndex >= 0 && parts.count() > lladdrIndex + 1 && parts.at(lladdrIndex+1).toLower() == m_macAddress.toLower()) {
+        if (lladdrIndex == -1 || parts.count() <= lladdrIndex) {
+            continue;
+        }
+        QString entryIP = parts.first();
+        QString entryMAC = parts.at(lladdrIndex + 1);
+
+        if (entryMAC.toLower() == m_macAddress.toLower()) {
             found = true;
             QString entryIP = parts.first();
             if (parts.last() == "REACHABLE") {
@@ -72,13 +78,13 @@ void DeviceMonitor::arpLookupFinished(int exitCode)
                     emit reachableChanged(true);
                 }
                 emit seen();
+                m_lastSeenTime = QDateTime::currentDateTime();
                 // Verify if IP address is still the same
                 if (entryIP != mostRecentIP) {
                     mostRecentIP = entryIP;
                 }
                 // If we have a reachable entry, stop processing here
                 needsPing = false;
-                m_failedPings = 0;
                 break;
             } else {
                 // ARP claims the device to be stale... Flagging device to require a ping.
@@ -94,6 +100,11 @@ void DeviceMonitor::arpLookupFinished(int exitCode)
                     }
                 }
             }
+        } else if (entryIP == m_ipAddress) {
+            warn("There seems to be a device with our IP but different MAC. Resetting IP config.");
+            if (mostRecentIP == m_ipAddress) {
+                mostRecentIP.clear();
+            }
         }
     }
     if (mostRecentIP != m_ipAddress) {
@@ -101,6 +112,14 @@ void DeviceMonitor::arpLookupFinished(int exitCode)
         m_ipAddress = mostRecentIP;
         emit addressChanged(mostRecentIP);
     }
+    if (m_ipAddress.isEmpty()) {
+        warn("Device not found in ARP cache and no IP config available. Marking as gone.");
+        if (m_reachable) {
+            m_reachable = false;
+            emit reachableChanged(false);
+        }
+        return;
+    }
     if (!found) {
         log("Device not found in ARP cache.");
         arping();
@@ -144,13 +163,13 @@ void DeviceMonitor::arpingFinished(int exitCode)
             emit reachableChanged(true);
         }
         emit seen();
-        m_failedPings = 0;
+        m_lastSeenTime = QDateTime::currentDateTime();
     } else {
         log("ARP Ping failed.");
         ping();
     }
     // read data to discard it from socket
-    QString data = QString::fromLatin1(m_pingProcess->readAll());
+    QString data = QString::fromLatin1(m_arpingProcess->readAll());
     Q_UNUSED(data)
 //    qCDebug(dcNetworkDetector()) << "have ping data" << data;
 }
@@ -172,16 +191,11 @@ void DeviceMonitor::pingFinished(int exitCode)
             emit reachableChanged(true);
         }
         emit seen();
-        m_failedPings = 0;
+        m_lastSeenTime = QDateTime::currentDateTime();
     } else {
-        m_failedPings++;
+        log("ICMP Ping failed.");
-        log("ICMP Ping failed for " + QString::number(m_failedPings) + " times. (Grace Period: " + QString::number(m_gracePeriod) + ")");
+        if (m_reachable && m_lastSeenTime.addSecs(m_gracePeriod * 60) < QDateTime::currentDateTime()) {
-        if (m_failedPings > m_gracePeriod - 1) {
+            log("Exceeded grace period of " + QString::number(m_gracePeriod) + " minutes. Marking device as offline.");
-            // Regular ping fails too... Fire a broadcast ping in case the device has changed IP. After that, our ARP table should be up to date again.
-            broadcastPing();
-        }
-        if (m_failedPings > m_gracePeriod && m_reachable) {
-            log("Marking device as offline.");
             m_reachable = false;
             emit reachableChanged(false);
         }
@@ -192,41 +206,6 @@ void DeviceMonitor::pingFinished(int exitCode)
 //    qCDebug(dcNetworkDetector()) << "have ping data" << data;
 }
 
-void DeviceMonitor::broadcastPing()
-{
-    QNetworkAddressEntry targetAddressEntry;
-    foreach (const QNetworkInterface &interface, QNetworkInterface::allInterfaces()) {
-        foreach (const QNetworkAddressEntry &addressEntry, interface.addressEntries()) {
-            QHostAddress clientAddress(m_ipAddress);
-            if (clientAddress.isInSubnet(addressEntry.ip(), addressEntry.prefixLength())) {
-                targetAddressEntry = addressEntry;
-                break;
-            }
-        }
-    }
-    if (targetAddressEntry.broadcast().isNull()) {
-        warn("Could not find a suitable broadcast address Ping.");
-        if (m_reachable) {
-            m_reachable = false;
-            emit reachableChanged(false);
-        }
-        return;
-    }
-
-    QProcess *p = new QProcess(this);
-    log("Sending Broadcast Ping on " + targetAddressEntry.ip().toString() + '/' + QString::number(targetAddressEntry.prefixLength()) + "...");
-    p->start("fping", {"-a", "-c", "5", "-g", targetAddressEntry.broadcast().toString() + "/" + QString::number(targetAddressEntry.prefixLength())});
-    connect(p, SIGNAL(finished(int)), this, SLOT(broadcastPingFinished(int)));
-}
-
-void DeviceMonitor::broadcastPingFinished(int exitCode)
-{
-    Q_UNUSED(exitCode);
-    log("Broadcast ping finished");
-    QProcess *p = static_cast<QProcess*>(sender());
-    p->deleteLater();
-}
-
 void DeviceMonitor::log(const QString &message)
 {
     qCDebug(dcNetworkDetector()).noquote().nospace() << m_name << " (" << m_macAddress  << ", " << m_ipAddress << "): " << message;

networkdetector/devicemonitor.h

@@ -3,6 +3,7 @@
 
 #include <QObject>
 #include <QProcess>
+#include <QDateTime>
 
 class DeviceMonitor : public QObject
 {
@@ -25,7 +26,6 @@ private:
     void lookupArpCache();
     void arping();
     void ping();
-    void broadcastPing();
 
     void log(const QString &message);
     void warn(const QString &message);
@@ -34,22 +34,19 @@ private slots:
     void arpLookupFinished(int exitCode);
     void arpingFinished(int exitCode);
     void pingFinished(int exitCode);
-    void broadcastPingFinished(int exitCode);
 
 private:
     QString m_name;
     QString m_macAddress;
     QString m_ipAddress;
+    QDateTime m_lastSeenTime;
 
     bool m_reachable = false;
-
     int m_gracePeriod = 5;
 
     QProcess *m_arpLookupProcess = nullptr;
     QProcess *m_arpingProcess = nullptr;
     QProcess *m_pingProcess = nullptr;
-    int m_failedPings = 0;
-
 };
 
 #endif // DEVICEMONITOR_H

networkdetector/devicepluginnetworkdetector.cpp

@@ -57,12 +57,13 @@ DevicePluginNetworkDetector::DevicePluginNetworkDetector()
 {
     m_discovery = new Discovery(this);
     connect(m_discovery, &Discovery::finished, this, &DevicePluginNetworkDetector::discoveryFinished);
+
+    m_broadcastPing = new BroadcastPing(this);
+    connect(m_broadcastPing, &BroadcastPing::finished, this, &DevicePluginNetworkDetector::broadcastPingFinished);
 }
 
 DevicePluginNetworkDetector::~DevicePluginNetworkDetector()
 {
-    hardwareManager()->pluginTimerManager()->unregisterTimer(m_pluginTimer);
-
     if (m_discovery->isRunning()) {
         m_discovery->abort();
     }
@@ -70,8 +71,6 @@ DevicePluginNetworkDetector::~DevicePluginNetworkDetector()
 
 void DevicePluginNetworkDetector::init()
 {
-    m_pluginTimer = hardwareManager()->pluginTimerManager()->registerTimer(10);
-    connect(m_pluginTimer, &PluginTimer::timeout, this, &DevicePluginNetworkDetector::onPluginTimer);
 }
 
 DeviceManager::DeviceSetupStatus DevicePluginNetworkDetector::setupDevice(Device *device)
@@ -86,7 +85,13 @@ DeviceManager::DeviceSetupStatus DevicePluginNetworkDetector::setupDevice(Device
     connect(monitor, &DeviceMonitor::addressChanged, this, &DevicePluginNetworkDetector::deviceAddressChanged);
     connect(monitor, &DeviceMonitor::seen, this, &DevicePluginNetworkDetector::deviceSeen);
     m_monitors.insert(monitor, device);
-    monitor->update();
+
+    if (!m_pluginTimer) {
+        m_pluginTimer = hardwareManager()->pluginTimerManager()->registerTimer(30);
+        connect(m_pluginTimer, &PluginTimer::timeout, m_broadcastPing, &BroadcastPing::run);
+
+        m_broadcastPing->run();
+    }
 
     return DeviceManager::DeviceSetupStatusSuccess;
 }
@@ -114,9 +119,15 @@ void DevicePluginNetworkDetector::deviceRemoved(Device *device)
     DeviceMonitor *monitor = m_monitors.key(device);
     m_monitors.remove(monitor);
     delete monitor;
+
+    if (m_monitors.isEmpty()) {
+        hardwareManager()->pluginTimerManager()->unregisterTimer(m_pluginTimer);
+        m_pluginTimer = nullptr;
+
+    }
 }
 
-void DevicePluginNetworkDetector::onPluginTimer()
+void DevicePluginNetworkDetector::broadcastPingFinished()
 {
     foreach (DeviceMonitor *monitor, m_monitors.keys()) {
         monitor->update();

networkdetector/devicepluginnetworkdetector.h

@@ -29,6 +29,7 @@
 #include "discovery.h"
 #include "plugintimer.h"
 #include "devicemonitor.h"
+#include "broadcastping.h"
 
 #include <QProcess>
 #include <QXmlStreamReader>
@@ -59,11 +60,12 @@ private slots:
     void deviceAddressChanged(const QString &address);
     void deviceSeen();
 
-    void onPluginTimer();
+    void broadcastPingFinished();
 
 private:
     PluginTimer *m_pluginTimer = nullptr;
     Discovery *m_discovery = nullptr;
+    BroadcastPing *m_broadcastPing = nullptr;
     QHash<DeviceMonitor*, Device*> m_monitors;
 };
 

networkdetector/networkdetector.pro

@@ -8,12 +8,14 @@ SOURCES += \
     devicepluginnetworkdetector.cpp \
     host.cpp \
     discovery.cpp \
-    devicemonitor.cpp
+    devicemonitor.cpp \
+    broadcastping.cpp
 
 HEADERS += \
     devicepluginnetworkdetector.h \
     host.h \
     discovery.h \
-    devicemonitor.h
+    devicemonitor.h \
+    broadcastping.h