Create a Man In The Middle for OBD and Moblie App

OBD (Qt C++)/ManInTheMiddleOBD/ManInTheMiddleOBD.pro

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+#-------------------------------------------------
+#
+# Project created by QtCreator 2019-02-07T08:51:09
+#
+#-------------------------------------------------
+
+QT       += core gui
+
+greaterThan(QT_MAJOR_VERSION, 4): QT += widgets network
+
+TARGET = ManInTheMiddleOBD
+TEMPLATE = app
+
+# The following define makes your compiler emit warnings if you use
+# any feature of Qt which has been marked as deprecated (the exact warnings
+# depend on your compiler). Please consult the documentation of the
+# deprecated API in order to know how to port your code away from it.
+DEFINES += QT_DEPRECATED_WARNINGS
+
+# You can also make your code fail to compile if you use deprecated APIs.
+# In order to do so, uncomment the following line.
+# You can also select to disable deprecated APIs only up to a certain version of Qt.
+#DEFINES += QT_DISABLE_DEPRECATED_BEFORE=0x060000    # disables all the APIs deprecated before Qt 6.0.0
+
+CONFIG += c++11
+
+SOURCES += \
+        main.cpp \
+        mainwindow.cpp
+
+HEADERS += \
+        mainwindow.h
+
+FORMS += \
+        mainwindow.ui
+
+# Default rules for deployment.
+qnx: target.path = /tmp/$${TARGET}/bin
+else: unix:!android: target.path = /opt/$${TARGET}/bin
+!isEmpty(target.path): INSTALLS += target

OBD (Qt C++)/ManInTheMiddleOBD/main.cpp

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+#include "mainwindow.h"
+#include <QApplication>
+
+int main(int argc, char *argv[])
+{
+    QApplication a(argc, argv);
+    MainWindow w;
+    w.show();
+
+    return a.exec();
+}

OBD (Qt C++)/ManInTheMiddleOBD/mainwindow.cpp

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+#include "mainwindow.h"
+#include "ui_mainwindow.h"
+
+MainWindow::MainWindow(QWidget *parent) :
+    QMainWindow(parent),
+    ui(new Ui::MainWindow)
+{
+    ui->setupUi(this);
+
+    socket = new QTcpSocket(this);
+
+    socket->connectToHost("192.168.0.10", 35000);
+
+    if(socket->waitForConnected())
+        LogDat("Connected to OBD");
+    else
+        LogDatError("Failed to connect");
+
+    connect(socket, &QTcpSocket::readyRead, this, &MainWindow::readNetwork1Line);
+
+
+    server = new QTcpServer(this);
+
+    if(server->listen(QHostAddress::Any, 1024))
+        LogDat("Listening to 1024");
+    else
+        LogDatError("Failed to listen");
+
+    connect(server, &QTcpServer::newConnection, this, &MainWindow::newConnection);
+}
+
+MainWindow::~MainWindow()
+{
+    delete ui;
+}
+
+QByteArray MainWindow::readLine(QTcpSocket* sk)
+{
+    QByteArray msg = "";
+    while(sk->bytesAvailable() > 0){
+        QByteArray c = sk->read(1);
+        msg.append(c);
+        if(c[0] == '>'){
+            return msg;
+        }
+    }
+    return "";
+}
+
+void MainWindow::newConnection()
+{
+    while (server->hasPendingConnections())
+    {
+        QTcpSocket *s_socket = server->nextPendingConnection();
+        LogDat("Client connected from " + QHostAddress(s_socket->peerAddress().toIPv4Address()).toString() + "::" + QString::number(s_socket->peerPort()));
+        clients.append(s_socket);
+        connect(s_socket, &QTcpSocket::readyRead, this, &MainWindow::readNetwork2Line);
+        connect(s_socket, &QTcpSocket::disconnected, this, &MainWindow::disconnected);
+    }
+}
+
+void MainWindow::disconnected()
+{
+    QTcpSocket *s_socket = static_cast<QTcpSocket*>(sender());
+    LogDat("Client disconnected from " + QHostAddress(s_socket->peerAddress().toIPv4Address()).toString() + "::" + QString::number(s_socket->peerPort()));
+    s_socket->deleteLater();
+    clients.removeAll(s_socket);
+}
+
+void MainWindow::readNetwork1Line()
+{
+    QByteArray msg = readLine(socket);
+    LogDat("OBD sended: " + msg);
+    foreach(QTcpSocket* sk,  clients)
+        sk->write(msg);
+}
+
+void MainWindow::readNetwork2Line()
+{
+    QTcpSocket *s_socket = static_cast<QTcpSocket*>(sender());
+    QByteArray msg = readLine(s_socket);
+    LogDat("Mobile App sended: " + msg);
+    socket->write(msg);
+}
+
+void MainWindow::LogDat(QString log)
+{
+    ui->scrollArea->widget()->layout()->addWidget(new QLabel(log));
+}
+
+void MainWindow::LogDatError(QString log)
+{
+    QLabel* aux = new QLabel("ERROR: " + log);
+    QPalette* aux2 = new QPalette();
+    aux2->setColor(aux->foregroundRole(), Qt::red);
+    aux->setPalette(*aux2);
+
+    ui->scrollArea->widget()->layout()->addWidget(aux);
+}

OBD (Qt C++)/ManInTheMiddleOBD/mainwindow.h

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+#ifndef MAINWINDOW_H
+#define MAINWINDOW_H
+
+#include <QMainWindow>
+#include <QTcpSocket>
+#include <QTcpServer>
+#include <QLabel>
+
+namespace Ui {
+class MainWindow;
+}
+
+class MainWindow : public QMainWindow
+{
+    Q_OBJECT
+
+public:
+    explicit MainWindow(QWidget *parent = nullptr);
+    ~MainWindow();
+
+private:
+    Ui::MainWindow *ui;
+    QTcpSocket *socket;
+    QTcpServer *server;
+    QList<QTcpSocket*> clients;
+
+    void readNetwork1Line();
+    void readNetwork2Line();
+    void LogDat(QString log);
+    void LogDatError(QString log);
+    QByteArray readLine(QTcpSocket* sk);
+    void newConnection();
+    void disconnected();
+};
+
+#endif // MAINWINDOW_H

OBD (Qt C++)/ManInTheMiddleOBD/mainwindow.ui

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+<?xml version="1.0" encoding="UTF-8"?>
+<ui version="4.0">
+ <class>MainWindow</class>
+ <widget class="QMainWindow" name="MainWindow">
+  <property name="geometry">
+   <rect>
+    <x>0</x>
+    <y>0</y>
+    <width>400</width>
+    <height>300</height>
+   </rect>
+  </property>
+  <property name="windowTitle">
+   <string>MainWindow</string>
+  </property>
+  <widget class="QWidget" name="centralWidget">
+   <layout class="QVBoxLayout" name="verticalLayout">
+    <item>
+     <widget class="QScrollArea" name="scrollArea">
+      <property name="widgetResizable">
+       <bool>true</bool>
+      </property>
+      <widget class="QWidget" name="scrollAreaWidgetContents">
+       <property name="geometry">
+        <rect>
+         <x>0</x>
+         <y>0</y>
+         <width>386</width>
+         <height>237</height>
+        </rect>
+       </property>
+       <layout class="QVBoxLayout" name="verticalLayout_3"/>
+      </widget>
+     </widget>
+    </item>
+   </layout>
+  </widget>
+  <widget class="QMenuBar" name="menuBar">
+   <property name="geometry">
+    <rect>
+     <x>0</x>
+     <y>0</y>
+     <width>400</width>
+     <height>17</height>
+    </rect>
+   </property>
+  </widget>
+  <widget class="QToolBar" name="mainToolBar">
+   <attribute name="toolBarArea">
+    <enum>TopToolBarArea</enum>
+   </attribute>
+   <attribute name="toolBarBreak">
+    <bool>false</bool>
+   </attribute>
+  </widget>
+  <widget class="QStatusBar" name="statusBar"/>
+ </widget>
+ <layoutdefault spacing="6" margin="11"/>
+ <resources/>
+ <connections/>
+</ui>