From 5231302217cd8735a3359c26ca2bfdf80d71e5df Mon Sep 17 00:00:00 2001
From: Denis Davydov <denidav@yandex.ru>
Date: Thu, 26 Jul 2018 14:42:37 +0300
Subject: [PATCH] Now the application does not start if it does not find ip,
 which starts with "fc" (ie, before starting the messenger, you need to run
 the cjdns daemon)

---
 src/kernel/network.cpp | 12 ++++++++++--
 src/main.cpp           |  4 ++++
 src/mainwindow.cpp     |  7 ++++++-
 src/mainwindow.h       |  2 ++
 4 files changed, 22 insertions(+), 3 deletions(-)

diff --git a/src/kernel/network.cpp b/src/kernel/network.cpp
index 892c717..c055a6a 100644
--- a/src/kernel/network.cpp
+++ b/src/kernel/network.cpp
@@ -37,11 +37,19 @@ void Network::processTheDatagram()
 QString Network::localIPv6()
 {
     QHostAddress address;
+    QString addressString;
     foreach (address, QNetworkInterface::allAddresses()) {
         if (address.protocol() == QAbstractSocket::IPv6Protocol && address != QHostAddress(QHostAddress::LocalHostIPv6) && (address.toString()).contains("fc"))
-             break;
+        {
+            addressString = address.toString();
+            break;
+        }
+        else
+        {
+            addressString = "null";
+        }
     }
-    return(address.toString());
+    return(addressString);
 }
 
 Network::~Network()
diff --git a/src/main.cpp b/src/main.cpp
index b48f94e..c86e878 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -5,6 +5,10 @@ int main(int argc, char *argv[])
 {
     QApplication a(argc, argv);
     MainWindow w;
+    if(w.doQuit())
+    {
+        return -1;
+    }
     w.show();
 
     return a.exec();
diff --git a/src/mainwindow.cpp b/src/mainwindow.cpp
index 72178ff..ddb1da2 100644
--- a/src/mainwindow.cpp
+++ b/src/mainwindow.cpp
@@ -5,8 +5,13 @@ MainWindow::MainWindow(QWidget *parent) :
     QMainWindow(parent),
     ui(new Ui::MainWindow)
 {
-    ui->setupUi(this);
     network = new Network(false);
+    if(*network->myIPv6 == "null")
+    {
+        QMessageBox::critical(parent, tr("Cjdns is not running!"), tr("Cjdns is not running, so the application will be closed."));
+        mDoQuit = true;
+    }
+    ui->setupUi(this);
     handler = new Handler();
     timer = new QTimer();
     connect(timer, SIGNAL(timeout()), this, SLOT(slotTimerAlarm()));
diff --git a/src/mainwindow.h b/src/mainwindow.h
index 918790a..fa791d2 100644
--- a/src/mainwindow.h
+++ b/src/mainwindow.h
@@ -25,6 +25,7 @@ class MainWindow : public QMainWindow
         QVector<ChatWindow*> pChatWindows;
         void setButtonToWaiting();
         void setButtonToConnect();
+        inline bool doQuit() const { return mDoQuit; }
     public slots:
         void peerReceiverAvailable();
     private slots:
@@ -42,4 +43,5 @@ class MainWindow : public QMainWindow
         Network *network;
         Handler *handler;
         bool receive = false;
+        bool mDoQuit = false;
 };