diff --git a/YourChat.pro b/YourChat.pro
index e4b5a40..b0563cf 100644
--- a/YourChat.pro
+++ b/YourChat.pro
@@ -2,5 +2,33 @@ TEMPLATE = app
 CONFIG += console c++11
 CONFIG -= app_bundle
 CONFIG -= qt
+TARGET = yourchat
 
-SOURCES += main.cpp
+SOURCES += main.cpp \
+    config.cpp \
+    server.cpp \
+    room.cpp \
+    user.cpp \
+    tools.cpp
+
+DISTFILES += \
+    config/chatconfig.json
+
+HEADERS += \
+    config.h \
+    server.h \
+    room.h \
+    user.h \
+    tools.h
+
+LIBS += -ljsoncpp \
+    -lpthread
+
+bin.path = /opt/yourchat
+bin.files += yourchat
+
+config.path = /etc/yourpart
+config.files += config/chatconfig.json
+
+INSTALLS += bin \
+    config
diff --git a/config.cpp b/config.cpp
index 9e0287b..f7c65c7 100644
--- a/config.cpp
+++ b/config.cpp
@@ -1,12 +1,31 @@
 #include "config.h"
 
+#include <json/json.h>
+#include <fstream>
+#include <iostream>
+
 namespace Yc {
-namespace Lib {
+    namespace Lib {
 
-Config::Config()
-{
+        Config::Config() {
+            loadConfig();
+        }
 
-}
+        void Config::loadConfig() {
+            std::ifstream configStream("/etc/yourpart/chatconfig.json", std::ifstream::binary);
+            configStream >> jsonConfig;
+        }
 
-} // namespace Lib
+        Json::Value Config::value(std::string groupName, std::string field) {
+            if (jsonConfig[groupName].isNull()) {
+                return "";
+            }
+            return jsonConfig[groupName][field];
+        }
+
+        Json::Value Config::group(std::string groupName) {
+            return jsonConfig[groupName];
+        }
+
+    } // namespace Lib
 } // namespace Yc
diff --git a/config.h b/config.h
index 306b12c..07c1097 100644
--- a/config.h
+++ b/config.h
@@ -1,6 +1,8 @@
 #ifndef YC_LIB_CONFIG_H
 #define YC_LIB_CONFIG_H
 
+#include <string>
+#include <json/value.h>
 
 namespace Yc {
 namespace Lib {
@@ -9,9 +11,14 @@ class Config
 {
 public:
     Config();
+    void loadConfig();
+    Json::Value value(std::string group, std::string field);
+    Json::Value group(std::string groupName);
+private:
+    Json::Value jsonConfig;
 };
 
 } // namespace Lib
 } // namespace Yc
 
-#endif // YC_LIB_CONFIG_H
\ No newline at end of file
+#endif // YC_LIB_CONFIG_H
diff --git a/config/chatconfig.json b/config/chatconfig.json
index e69de29..ff0cc45 100644
--- a/config/chatconfig.json
+++ b/config/chatconfig.json
@@ -0,0 +1,17 @@
+{
+    "server": {
+        "port": 1235
+    },
+    "database": {
+        "user": "yourpart",
+        "password": "r3EMWJ5p",
+        "connectstring": "tsschulz.de:1521/yourpart"
+    },
+    "rooms": [
+        {
+            "name": "Halle",
+            "password": "",
+            "allowed": []
+        }
+    ]
+}
diff --git a/main.cpp b/main.cpp
index b5b73c5..7f67efb 100644
--- a/main.cpp
+++ b/main.cpp
@@ -1,9 +1,10 @@
-#include <iostream>
+#include "config.h"
+#include "server.h"
 
-using namespace std;
-
-int main(int argc, char *argv[])
+int main(int, char **)
 {
-    cout << "Hello World!" << endl;
+    Yc::Lib::Config *config = new Yc::Lib::Config();
+    Yc::Lib::Server server(config);
+    server.run();
     return 0;
 }
diff --git a/room.cpp b/room.cpp
index de52a12..16d2023 100644
--- a/room.cpp
+++ b/room.cpp
@@ -1,12 +1,93 @@
 #include "room.h"
 
+#include <algorithm>
+#include <server.h>
+#include <unistd.h>
+#include <iostream>
+
 namespace Yc {
-namespace Lib {
+    namespace Lib {
 
-Room::Room()
-{
+        Room::Room(Server *parent, std::string name, std::string password, std::vector<std::string> allowedUsers) :
+                _parent(parent),
+                _name(name),
+                _password(password),
+                _allowedUsers(allowedUsers),
+                _blocked(false),
+                _stop(false) {
+            thread = new std::thread(&Room::run, this);
+        }
 
-}
+        void Room::run() {
+            while (!_stop) {
+                if (_msgQueue.size() > 0 && !_blocked) {
+                    _blocked = true;
+                    while (_msgQueue.size() > 0) {
+                        Message message = _msgQueue.front();
+                        _msgQueue.pop();
+                        for (auto &user: _users) {
+                            user.sendMsg(message.type, message.messageTr, message.userName, message.color);
+                        }
+                    }
+                    _blocked = false;
+                }
+                usleep(50000);
+            }
+        }
 
-} // namespace Lib
+        bool Room::addUser(std::string _userName, std::string color, std::string _password, int socket) {
+            if (_password != "" && _password == _password && std::find(std::begin(_allowedUsers), std::end(_allowedUsers), _userName) == std::end(_allowedUsers)) {
+                return false;
+            }
+            User newUser(this, _userName, color, socket);
+            _users.push_back(newUser);
+            newUser.sendMsg(User::roomList, _parent->jsonRoomList(), "", "");
+            addMessage(User::system, "room_entered", newUser.name(), newUser.color());
+            return true;
+        }
+
+        bool Room::addUser(User user, std::string password) {
+            if (password == _password) {
+                _users.push_back(user);
+                return true;
+            }
+            return false;
+        }
+
+        bool Room::userNameExists(std::string userName) {
+            for (auto &user: _users) {
+                if (user.name() == userName) {
+                    return true;
+                }
+            }
+            return false;
+        }
+
+        void Room::removeUser(std::string _token) {
+            for (std::vector<User>::iterator user = _users.begin(); user != _users.end(); ++user) {
+                if (user->validateToken(_token)) {
+                    _users.erase(user);
+                }
+            }
+        }
+
+        void Room::setStop() {
+            _stop = true;
+        }
+
+        void Room::addMessage(User::MsgType type, std::string messageText, std::string userName, std::string color)
+        {
+            Message message;
+            message.type = type;
+            message.messageTr = messageText;
+            message.userName = userName;
+            message.color = color;
+            _msgQueue.push(message);
+        }
+
+        std::string Room::name() {
+            return _name;
+        }
+
+    } // namespace Lib
 } // namespace Yc
diff --git a/room.h b/room.h
index 63d89a1..4d59676 100644
--- a/room.h
+++ b/room.h
@@ -1,17 +1,49 @@
 #ifndef YC_LIB_ROOM_H
 #define YC_LIB_ROOM_H
 
+#include <vector>
+#include <string>
+#include <user.h>
+#include <queue>
+#include <thread>
 
 namespace Yc {
-namespace Lib {
+    namespace Lib {
 
-class Room
-{
-public:
-    Room();
-};
+        class Server;
 
-} // namespace Lib
+        class Room
+        {
+        public:
+            Room(Server *parent, std::string name, std::string password = "", std::vector<std::string> allowedUsers = std::vector<std::string>());
+            void run();
+            std::string name();
+            bool addUser(std::string userName, std::string color, std::string password, int socket);
+            bool addUser(User user, std::string password);
+            bool userNameExists(std::string userName);
+            void removeUser(std::string _token);
+            void setStop();
+            void addMessage(User::MsgType type, std::string message, std::string userName = "", std::string color = "");
+        private:
+            struct Message {
+                User::MsgType type;
+                std::string messageTr;
+                std::string userName;
+                std::string color;
+            };
+
+            Server *_parent;
+            std::string _name;
+            std::string _password;
+            std::vector<std::string> _allowedUsers;
+            std::vector<User> _users;
+            bool _blocked;
+            bool _stop;
+            std::queue<Message> _msgQueue;
+            std::thread *thread;
+        };
+
+    } // namespace Lib
 } // namespace Yc
 
-#endif // YC_LIB_ROOM_H
\ No newline at end of file
+#endif // YC_LIB_ROOM_H
diff --git a/server.cpp b/server.cpp
index 6ee1a4a..88b2b5b 100644
--- a/server.cpp
+++ b/server.cpp
@@ -1,12 +1,149 @@
 #include "server.h"
 
-namespace Yp {
-namespace Lib {
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <netinet/in.h>
+#include <thread>
+#include <future>
+#include <functional>
+#include <strings.h>
+#include <unistd.h>
+#include <json/json.h>
+#include <iostream>
+#include <netinet/tcp.h>
+#include <sstream>
 
-Server::Server()
-{
+namespace Yc {
+    namespace Lib {
 
-}
+        Server::Server(Yc::Lib::Config *config) :
+                _config(config),
+                _stop(false) {
+            struct sockaddr_in serverAddr;
+            int opt = true;
+            _socket = socket(AF_INET, SOCK_STREAM, 0);
+            setsockopt(_socket, SOL_SOCKET, SO_REUSEADDR, (char *)&opt, sizeof(opt));
+            int flags = 1;
+            setsockopt(_socket, IPPROTO_TCP, TCP_NODELAY, (void *)&flags, sizeof(flags));
+            serverAddr.sin_family = AF_INET;
+            serverAddr.sin_addr.s_addr = INADDR_ANY;
+            serverAddr.sin_port = htons(1235);
+            if (bind(_socket, (struct sockaddr *)&serverAddr, sizeof(serverAddr)) < 0) {
+                std::cout << "bind not possible" << std::endl;
+                exit(-1);
+            }
+            createRooms(config->group("rooms"));
+        }
 
-} // namespace Lib
+        void Server::run() {
+            if (listen(_socket, 5) < 0) {
+                std::cout << "listen not possible" << std::endl;
+                exit(-1);
+            }
+            timeval origTv;
+            origTv.tv_sec = 5;
+            origTv.tv_usec = 0;
+            int _maxSd  = _socket;
+            while (!_stop) {
+                timeval tv(origTv);
+                fd_set fd;
+                FD_ZERO(&fd);
+                FD_SET(_socket, &fd);
+                if (select(_maxSd + 1, &fd, NULL, NULL, &tv) > 0) {
+                    std::async(std::launch::async, &Server::handleRequest, this);
+                }
+            }
+        }
+
+        std::vector<std::string> Server::roomList() {
+            std::vector<std::string> list;
+            for (auto &room: _rooms) {
+                list.push_back(room->name());
+            }
+            return list;
+        }
+
+        Json::Value Server::jsonRoomList() {
+            Json::Value list;
+            for (auto &room: _rooms) {
+                list.append(room->name());
+            }
+            return list;
+        }
+
+        void Server::createRooms(Json::Value roomList) {
+            for (auto &room: roomList)  {
+                std::vector<std::string> allowedUsers;
+                for (auto &user: room["allowed"]) {
+                    allowedUsers.push_back(user.asString());
+                }
+                Room *newRoom = new Room(this, room["name"].asString(), room["password"].asString(), allowedUsers);
+                _rooms.push_back(newRoom);
+            }
+        }
+
+        void Server::handleRequest() {
+            struct sockaddr_in sockAddr;
+            socklen_t sockAddrLen = sizeof(sockAddr);
+            int userSock = accept(_socket, (struct sockaddr *)&sockAddr, &sockAddrLen);
+            if (userSock < 0) {
+                return;
+            }
+            int flags = 1;
+            setsockopt(userSock, IPPROTO_TCP, TCP_NODELAY, (void *)&flags, sizeof(flags));
+            std::string msg("");
+            char buffer[256];
+            bzero(buffer, 256);
+            while (int received = recv(userSock, buffer, 255, 0) > 0) {
+                msg += std::string(buffer);
+                if (received < 255) {
+                    break;
+                }
+            }
+            if (msg == "") {
+                return;
+            }
+            inputSwitcher(userSock, msg);
+        }
+
+        void Server::inputSwitcher(int userSocket, std::string input) {
+            Json::Value inputTree;
+            Json::CharReaderBuilder rbuilder;
+            std::unique_ptr<Json::CharReader> const reader(rbuilder.newCharReader());
+            JSONCPP_STRING inputJsonString(input);
+            reader->parse(inputJsonString.data(), inputJsonString.data() + inputJsonString.size(), &inputTree, NULL);
+            if (inputTree["type"] == "init") {
+                initUser(userSocket, inputTree);
+            }
+        }
+
+        bool Server::userExists(std::string userName) {
+            for (auto &room: _rooms) {
+                if (room->userNameExists(userName)) {
+                    return true;
+                }
+            }
+            return false;
+        }
+
+        void Server::initUser(int userSocket, Json::Value data) {
+            if (userExists(data["name"].asString())) {
+                close(userSocket);
+                return;
+            }
+            std::string room = data["room"].asString();
+            bool added(false);
+            for (auto &room: _rooms) {
+                if (room->name() == data["room"].asString()) {
+                    if (room->addUser(data["name"].asString(), data["color"].asString(), data["password"].asString(), userSocket)) {
+                        added = true;
+                        break;
+                    }
+                }
+            }
+            if (!added) {
+                close(userSocket);
+            }
+        }
+    } // namespace Lib
 } // namespace Yp
diff --git a/server.h b/server.h
index 3417c70..dc24d27 100644
--- a/server.h
+++ b/server.h
@@ -1,17 +1,34 @@
 #ifndef YP_LIB_SERVER_H
 #define YP_LIB_SERVER_H
 
+#include "config.h"
+#include <vector>
+#include "room.h"
+#include <json/value.h>
 
-namespace Yp {
-namespace Lib {
+namespace Yc {
+    namespace Lib {
 
-class Server
-{
-public:
-    Server();
-};
+        class Server
+        {
+        public:
+            Server(Yc::Lib::Config *config);
+            void run();
+            std::vector<std::string> roomList();
+            Json::Value jsonRoomList();
+        private:
+            int _socket;
+            Yc::Lib::Config *_config;
+            bool _stop;
+            std::vector<Yc::Lib::Room*> _rooms;
+            void createRooms(Json::Value roomList);
+            void handleRequest();
+            void inputSwitcher(int userSocket, std::string input);
+            bool userExists(std::string userName);
+            void initUser(int userSocket, Json::Value data);
+        };
 
-} // namespace Lib
+    } // namespace Lib
 } // namespace Yp
 
-#endif // YP_LIB_SERVER_H
\ No newline at end of file
+#endif // YP_LIB_SERVER_H
diff --git a/tools.cpp b/tools.cpp
index 30c619d..ec2d5da 100644
--- a/tools.cpp
+++ b/tools.cpp
@@ -1,12 +1,33 @@
 #include "tools.h"
 
-namespace Yp {
-namespace Lib {
+#include <random>
+#include <string>
 
-Tools::Tools()
-{
+namespace Yc {
+    namespace Lib {
 
-}
+        Tools::Tools() {
 
-} // namespace Lib
+        }
+
+        std::string Tools::generateRandomString(size_t length) {
+            std::string choices(
+                "0123456789"
+                "`~!@#$%^&*()-_=+[{]}|\\:;<,>./?"
+                "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"
+            );
+
+            std::random_device random;
+            std::mt19937 generator(random());
+            std::uniform_int_distribution<size_t> distribution(0, choices.size());
+
+            std::string result(length, '0');
+            for (size_t i = 0; i < length; ++i) {
+                result[i] = choices[distribution(generator)];
+            }
+
+            return result;
+        }
+
+    } // namespace Lib
 } // namespace Yp
diff --git a/tools.h b/tools.h
index 99e3b92..45de509 100644
--- a/tools.h
+++ b/tools.h
@@ -1,17 +1,19 @@
 #ifndef YP_LIB_TOOLS_H
 #define YP_LIB_TOOLS_H
 
+#include <string>
 
-namespace Yp {
-namespace Lib {
+namespace Yc {
+    namespace Lib {
 
-class Tools
-{
-public:
-    Tools();
-};
+        class Tools
+        {
+        public:
+            Tools();
+            static std::string generateRandomString(size_t length = 16);
+        };
 
-} // namespace Lib
+    } // namespace Lib
 } // namespace Yp
 
-#endif // YP_LIB_TOOLS_H
\ No newline at end of file
+#endif // YP_LIB_TOOLS_H
diff --git a/user.cpp b/user.cpp
index 4516463..6e7603f 100644
--- a/user.cpp
+++ b/user.cpp
@@ -1,12 +1,91 @@
 #include "user.h"
 
+#include <tools.h>
+#include <json/json.h>
+#include <unistd.h>
+#include <future>
+#include <sys/socket.h>
+#include <sys/types.h>
+#include "room.h"
+#include <iostream>
+#include <netinet/in.h>
+#include <netinet/tcp.h>
+#include <sstream>
+
 namespace Yc {
-namespace Lib {
+    namespace Lib {
 
-User::User()
-{
+        User::User(Room *parent, std::string name, std::string color, int socket) :
+                _parent(parent),
+                _name(name),
+                _color(color),
+                _socket(socket),
+                _stop(false) {
+            _token = Yc::Lib::Tools::generateRandomString(32);
+            sendMsg(token, _token, "", "");
+            std::async(std::bind(&User::checkerTask, this));
+        }
 
-}
+        std::string User::name() const {
+            return _name;
+        }
 
-} // namespace Lib
+        bool User::validateToken(std::string token) {
+            return (token == _token);
+        }
+
+        bool User::isUser(User *toValidate) {
+            return (toValidate == this);
+        }
+
+        void User::sendMsg(MsgType type, std::string message , std::string userName, std::string color) {
+            Json::Value sendMessage;
+            sendMessage["type"] = type;
+            sendMessage["message"] = message;
+            sendMessage["userName"] = userName;
+            sendMessage["color"] = color;
+            std::string outString;
+            std::stringstream outStream;
+            outStream << sendMessage;
+            outString = outStream.str();
+            write(_socket, outString.c_str(), outString.length());
+        }
+
+        void User::sendMsg(User::MsgType type, Json::Value message, std::string userName, std::string color) {
+            Json::Value sendMessage;
+            sendMessage["type"] = type;
+            sendMessage["message"] = message;
+            sendMessage["userName"] = userName;
+            sendMessage["color"] = color;
+            std::string outString;
+            std::stringstream outStream;
+            outStream << sendMessage;
+            outString = outStream.str();
+            write(_socket, outString.c_str(), outString.length());
+        }
+
+        void User::checkerTask() {
+            while (!_stop) {
+                fd_set readSd;
+                FD_ZERO(&readSd);
+                FD_SET(_socket, &readSd);
+                timeval tv;
+                tv.tv_sec = 0;
+                tv.tv_usec = 100;
+                if (select(_socket + 1, &readSd, NULL, NULL, &tv) < 0 && errno != ETIMEDOUT) {
+                    _parent->removeUser(_token);
+                    _stop = true;
+                }
+            }
+        }
+
+        void User::stop() {
+            _stop = true;
+        }
+
+        std::string User::color() const {
+            return _color;
+        }
+
+    } // namespace Lib
 } // namespace Yc
diff --git a/user.h b/user.h
index 4c1c68d..c6b5019 100644
--- a/user.h
+++ b/user.h
@@ -1,17 +1,43 @@
 #ifndef YC_LIB_USER_H
 #define YC_LIB_USER_H
 
+#include <string>
+#include <json/json.h>
 
 namespace Yc {
-namespace Lib {
+    namespace Lib {
 
-class User
-{
-public:
-    User();
-};
+        class Room;
 
-} // namespace Lib
+        class User {
+        public:
+            enum MsgType {
+                token = 1,
+                userListe = 2,
+                roomList = 3,
+                message = 4,
+                system = 5
+            };
+
+            User(Room *parent, std::string name, std::string color, int socket);
+            std::string name() const;
+            bool validateToken(std::string token);
+            bool isUser(User *toValidate);
+            void sendMsg(MsgType type, std::string message, std::string userName, std::string color);
+            void sendMsg(MsgType type, Json::Value message, std::string userName, std::string color);
+            void checkerTask();
+            void stop();
+            std::string color() const;
+        private:
+            Room *_parent;
+            std::string _name;
+            std::string _color;
+            int _socket;
+            std::string _token;
+            bool _stop;
+        };
+
+    } // namespace Lib
 } // namespace Yc
 
-#endif // YC_LIB_USER_H
\ No newline at end of file
+#endif // YC_LIB_USER_H