Protokoll beschrieben

client.c

@@ -8,6 +8,7 @@
 #include <stdio.h>
 #include <string.h>
 #include <stdbool.h>
+#include <termios.h>
 #define BUF 1024
 
 void remN(char *s) {
@@ -30,269 +31,218 @@ bool startsWith(const char *pre, const char *str)
 }
 
 int main (int argc, char **argv) {
+   int create_socket;
+   char buffer[BUF];
+   struct sockaddr_in address;
+   int size;
 
-  int create_socket;
+   if( argc < 3 ){
-  char buffer[BUF];
+      printf("Usage: %s ServerAdresse Port\n", argv[0]);
-  struct sockaddr_in address;
+      exit(EXIT_FAILURE);
-  int size;
+   }
-
+   if ((create_socket = socket (AF_INET, SOCK_STREAM, 0)) == -1)
-  if( argc < 3 ){
+   {
-     printf("Usage: %s ServerAdresse Port\n", argv[0]);
+      perror("Socket error");
-     exit(EXIT_FAILURE);
+      return EXIT_FAILURE;
-  }
+   }
-
+   memset(&address,0,sizeof(address));
-  if ((create_socket = socket (AF_INET, SOCK_STREAM, 0)) == -1)
+   address.sin_family = AF_INET;
-  {
+   address.sin_port = htons (atoi(argv[2]));
-     perror("Socket error");
+   inet_aton (argv[1], &address.sin_addr);
-     return EXIT_FAILURE;
+   if (connect ( create_socket, (struct sockaddr *) &address, sizeof (address)) == 0)
-  }
+   {
-  
+      printf ("\x1b[32mConnection with server (%s) established\n\x1b[0m", inet_ntoa (address.sin_addr));
-  memset(&address,0,sizeof(address));
+      size=recv(create_socket,buffer,BUF-1, 0);
-  address.sin_family = AF_INET;
+      if (size>0)
-  address.sin_port = htons (atoi(argv[2]));
+      {
-  inet_aton (argv[1], &address.sin_addr);
+         buffer[size]= '\0';
-
+         printf("\x1b[36m%s\x1b[0m",buffer);
-  if (connect ( create_socket, (struct sockaddr *) &address, sizeof (address)) == 0)
+      }
-  {
+   }
-     printf ("\x1b[32mConnection with server (%s) established\n\x1b[0m", inet_ntoa (address.sin_addr));
+   else
-     size=recv(create_socket,buffer,BUF-1, 0);
+   {
-     if (size>0)
+      perror("\x1b[31mConnect error - no server available\x1b[0m");
-     {
+      return EXIT_FAILURE;
-        buffer[size]= '\0';
+   }
-        printf("\x1b[36m%s\x1b[0m",buffer);
-     }
-  }
-  else
-  {
-     perror("\x1b[31mConnect error - no server available\x1b[0m");
-     return EXIT_FAILURE;
-  }
-
    bool login = false;
-  do {
+   do {
-     //command vom user überprüfen
+      //command vom user überprüfen
-     char command[7] = "";
+      char command[7] = "";
-     printf ("\n\x1b[35mEnter Command:\x1b[0m \n");
+      printf ("\n\x1b[35mEnter Command:\x1b[0m \n");
-     fgets (command, 7, stdin);
+      fgets (command, 7, stdin);
 
-     if (startsWith("login", command) == true && login == false)
+      if (startsWith("login", command) == true && login == false)
-     {
+      {
-         char username[10] = "";
+            char username[10] = "";
-         char pw[50] = "";
+            char pw[50] = "";
-         char bufferString[BUF] = "";
+            char bufferString[BUF] = "";
-         strcpy(bufferString, "login;");
+            strcpy(bufferString, "login;");
-         //User Dateneingabe und daten einlesen
+            //User Dateneingabe und daten einlesen
-         printf("\x1b[35m<Username max. 8 Zeichen>\x1b[0m\n");
+            printf("\x1b[35m<Username max. 8 Zeichen>\x1b[0m\n");
-         fgets (username, 10, stdin);
+            fgets (username, 10, stdin);
+            printf("\x1b[35m<Passwort max. 50 Zeichen>\x1b[0m\n");
+            //PW eingabe unsichtbar machen
+            struct termios term, term_orig;
+            tcgetattr(STDIN_FILENO, &term);
+            term_orig = term;
+            term.c_lflag &= ~ECHO;
+            tcsetattr(STDIN_FILENO, TCSANOW, &term);
+            scanf("%s", pw);
+            // Eingabe wieder sichtbar schalten
+            tcsetattr(STDIN_FILENO, TCSANOW, &term_orig);
 
-         printf("\x1b[35m<Passwort max. 50 Zeichen>\x1b[0m\n");
+            strcat(bufferString, username);
-         fgets (pw, 50, stdin);
+            strcat(bufferString, ";");
-
+            strcat(bufferString, pw);
-         strcat(bufferString, username);
+            remN(bufferString);
-         strcat(bufferString, ";");
+            send(create_socket, bufferString, strlen (bufferString), 0);
-         strcat(bufferString, pw);
+            //Response vom Server (OK oder ERR) empfangen und ausgeben
-         remN(bufferString);
+            char readBuffer[BUF] = "";
-
+            read(create_socket , readBuffer, 1023); 
-         send(create_socket, bufferString, strlen (bufferString), 0);
+            remN(readBuffer);
-
+            if (strcmp("OK", readBuffer) == 0)
-         //Response vom Server (OK oder ERR) empfangen und ausgeben
+            {
-         char readBuffer[BUF] = "";
+               printf("\n\x1b[32m%s\x1b[0m\n", readBuffer);
-         read(create_socket , readBuffer, 1024); 
+               login = true;
-         printf("\n%s\n", readBuffer);
+            }else if (strcmp("ERR", readBuffer) == 0 || strcmp("Client Gesperrt", readBuffer) == 0)
-         if (strncmp(readBuffer, "OK", 2) == 0)
+            {
-         {
+               printf("\n\x1b[31m%s\x1b[0m\n", readBuffer);
-            login = true;
-         }
-     }else if (login == false && startsWith("quit", command) == true)
-     {
-        strcpy(buffer, "quit\n");
-     }else if (login == false)
-     {
-        printf("\x1b[33mBitte zuerst <login> eingeben. Erst danach können sie auf das Program zugreifen!\x1b[0m\n");
-     }
-
-     
-     
-     
-     if(login == true){
-     
-
-      //je nach command wird was audgeführt
-      if(startsWith("send", command) == true) {
-
-         char sender[8] = "";  
-         char empfaenger[8] = "";
-         char betreff[80] = "";
-         char nachricht[128] = "";
-         char bufferString[BUF] = "";
-         strcpy(bufferString, "");
-         strcat(bufferString, "send");
-         
-         //User Dateneingabe und daten einlesen
-         printf("\x1b[35m<Sender max. 8 Zeichen>\x1b[0m\n");
-         fgets (sender, 8, stdin);
-
-         printf("\x1b[35m<Empfänger max. 8 Zeichen>\x1b[0m\n");
-         fgets (empfaenger, 8, stdin);
-
-         printf("\x1b[35m<Betreff max. 80 Zeichen>\x1b[0m\n");
-         fgets (betreff, 80, stdin);
-
-         printf("\x1b[35m<Nachricht, beliebige Anzahl an Zeilen>\x1b[0m\n");
-         fgets (nachricht, 80, stdin);
-
-         //Buffer formatieren
-         strcat(bufferString, ";");
-         strcat(bufferString, sender);
-         strcat(bufferString, ";");
-         strcat(bufferString, empfaenger);
-         strcat(bufferString, ";");
-         strcat(bufferString, betreff);
-         strcat(bufferString, ";");
-         strcat(bufferString, nachricht);
-         remN(bufferString);
-         //printf("Buffer: %s", bufferString);
-         send(create_socket, bufferString, strlen (bufferString), 0);
-
-         //Response vom Server (OK oder ERR) empfangen und ausgeben
-         char readBuffer[BUF] = "";
-         read(create_socket , readBuffer, 1024); 
-         printf("\n%s\n", readBuffer);
-
-      }
-
-      else if(startsWith("list", command) == true) {
-         char bufferString[BUF] = "list";
-         char username[8] = "";
-         char p[20] = "";
-         int counter = 0;
-
-         printf("\x1b[35m<Username max. 8 Zeichen>\x1b[0m\n");
-         fgets (username, 8, stdin);
-         printf("\x1b[35m<Posteingang oder Postausgang>\x1b[0m\n");
-         fgets (p, 20, stdin);
-
-         strcat(bufferString, ";");
-         strcat(bufferString, username);
-         strcat(bufferString, ";");
-         strcat(bufferString, p);
-         remN(bufferString);
-         printf("%s ", bufferString);
-         send(create_socket, bufferString, strlen (bufferString), 0);
-
-         char readBuffer[BUF] = "";
-         read(create_socket , readBuffer, 1024); 
-
-         char delimiter[] = ";";
-         char *ptr;
-         ptr = strtok(readBuffer, delimiter);
-
-         while(ptr != NULL) {
-
-
-            if(strcmp(ptr, ".") == 0) {
-               
             }
-
+      }else if (login == false && startsWith("quit", command) == true)
-            else if(strcmp(ptr, "..") == 0) {
+      {
-               
-            }
-
-            else if (counter == 0) {
-               printf("\x1b[35m<Anzahl der Nachrichten für den User: %s>\x1b[0m\n", ptr);
-            }
-
-            else {
-               printf("Betreff: %s \n", ptr);
-               //printf("%.*s", 17, ptr + 5);
-            }
-            
-            counter = counter + 1;
-
-            // naechsten Abschnitt erstellen
- 	         ptr = strtok(NULL, delimiter);
-         }
-
-      }
-
-      else if(startsWith("read", command) == true) {
-         char bufferString[BUF] = "read";
-         char username[8] = "";
-         char nid[80] = "";
-         char folder[20] = "";
-
-         printf("\x1b[35m<Username max. 8 Zeichen>\x1b[0m\n");
-         fgets (username, 8, stdin);
-         printf("\x1b[35m<posteingang oder postausgang>\x1b[0m\n");
-         fgets (folder, 20, stdin);
-         printf("\x1b[35m<Nachrichten-Nummer>\x1b[0m\n");
-         fgets (nid, 80, stdin);
-
-         strcat(bufferString, ";");
-         strcat(bufferString, username);
-         strcat(bufferString, ";");
-         strcat(bufferString, folder);
-         strcat(bufferString, ";");
-         strcat(bufferString, nid);
-         remN(bufferString);
-
-         //printf("%s ", bufferString);
-
-         send(create_socket, bufferString, strlen (bufferString), 0);
-
-         //strcpy(buffer, "");
-         //buffer[size]= '\0';
-         char readBuffer[BUF] = "";
-         read(create_socket , readBuffer, 1000); 
-         printf("\n%s\n", readBuffer ); 
-
-      }
-
-      else if(startsWith("del", command) == true) {
-         //printf("\n del");
-
-         char username[8] = "";  
-         char nachrichtennummer[80] = "";
-         char bufferString[BUF] = "del";
-         char p[20] = "";
-
-         printf("\x1b[35m<Username max. 8 Zeichen>\x1b[0m\n");
-         fgets (username, 8, stdin);
-         printf("\x1b[35m<Posteingang oder Postausgang>\x1b[0m\n");
-         fgets (p, 20, stdin);
-         printf("\x1b[35m<Nachrichten-Nummer>\x1b[0m\n");
-         fgets (nachrichtennummer, 80, stdin);
-
-         strcat(bufferString, ";");
-         strcat(bufferString, username);
-         strcat(bufferString, ";");
-         strcat(bufferString, p);
-         strcat(bufferString, ";");
-         strcat(bufferString, nachrichtennummer);
-         remN(bufferString);
-         //printf("%s ", bufferString);
-         send(create_socket, bufferString, strlen (bufferString), 0);
-
-         char readBuffer[BUF] = "";
-         read(create_socket , readBuffer, 1024); 
-         printf("\n%s\n", readBuffer ); 
-
-      }
-
-      else if(startsWith("quit", command) == true) {
          strcpy(buffer, "quit\n");
+      }else if (login == false)
+      {
+         printf("\x1b[33mBitte zuerst <login> eingeben. Erst danach können sie auf das Program zugreifen!\x1b[0m\n");
       }
+      if(login == true){
+         //je nach command wird was audgeführt
+         if(startsWith("send", command) == true) {
+            char sender[10] = "";  
+            char empfaenger[10] = "";
+            char betreff[82] = "";
+            char nachricht[128] = "";
+            char bufferString[BUF] = "";
+            strcpy(bufferString, "");
+            strcat(bufferString, "send");
+            //User Dateneingabe und daten einlesen
+            printf("\x1b[35m<Sender max. 8 Zeichen>\x1b[0m\n");
+            fgets (sender, 10, stdin);
+            printf("\x1b[35m<Empfänger max. 8 Zeichen>\x1b[0m\n");
+            fgets (empfaenger, 10, stdin);
+            printf("\x1b[35m<Betreff max. 80 Zeichen>\x1b[0m\n");
+            fgets (betreff, 82, stdin);
+            printf("\x1b[35m<Nachricht, beliebige Anzahl an Zeilen>\x1b[0m\n");
+            fgets (nachricht, 82, stdin);
+            //Buffer formatieren
+            strcat(bufferString, ";");
+            strcat(bufferString, sender);
+            strcat(bufferString, ";");
+            strcat(bufferString, empfaenger);
+            strcat(bufferString, ";");
+            strcat(bufferString, betreff);
+            strcat(bufferString, ";");
+            strcat(bufferString, nachricht);
+            remN(bufferString);
+            send(create_socket, bufferString, strlen (bufferString), 0);
+            //Response vom Server (OK oder ERR) empfangen und ausgeben
+            char readBuffer[BUF] = "";
+            read(create_socket , readBuffer, 1024); 
+            printf("\n%s\n", readBuffer);
+         }else if(startsWith("list", command) == true) {
+            char bufferString[BUF] = "list";
+            char username[10] = "";
+            char p[22] = "";
+            int counter = 0;
+            printf("\x1b[35m<Username max. 8 Zeichen>\x1b[0m\n");
+            fgets (username, 10, stdin);
+            printf("\x1b[35m<Posteingang oder Postausgang>\x1b[0m\n");
+            fgets (p, 22, stdin);
 
-      else {
+            strcat(bufferString, ";");
-         printf("DAS IST KEIN COMMAND!!!!!");
+            strcat(bufferString, username);
+            strcat(bufferString, ";");
+            strcat(bufferString, p);
+            remN(bufferString);
+            send(create_socket, bufferString, strlen (bufferString), 0);
+
+            char readBuffer[BUF] = "";
+            read(create_socket , readBuffer, 1024); 
+
+            char delimiter[] = ";";
+            char *ptr;
+            ptr = strtok(readBuffer, delimiter);
+
+            while(ptr != NULL) {
+               if(strcmp(ptr, ".") == 0) {
+                  
+               }else if(strcmp(ptr, "..") == 0) {
+                  
+               }else if (counter == 0) {
+                  printf("\x1b[35m<Anzahl der Nachrichten für den User: %s>\x1b[0m\n", ptr);
+               }else {
+                  printf("Betreff: %s \n", ptr);
+               }
+               counter = counter + 1;
+               // naechsten Abschnitt erstellen
+               ptr = strtok(NULL, delimiter);
+            }
+         }else if(startsWith("read", command) == true) {
+            char bufferString[BUF] = "read";
+            char username[10] = "";
+            char nid[82] = "";
+            char folder[22] = "";
+
+            printf("\x1b[35m<Username max. 8 Zeichen>\x1b[0m\n");
+            fgets (username, 10, stdin);
+            printf("\x1b[35m<posteingang oder postausgang>\x1b[0m\n");
+            fgets (folder, 22, stdin);
+            printf("\x1b[35m<Nachrichten-Nummer>\x1b[0m\n");
+            fgets (nid, 82, stdin);
+
+            strcat(bufferString, ";");
+            strcat(bufferString, username);
+            strcat(bufferString, ";");
+            strcat(bufferString, folder);
+            strcat(bufferString, ";");
+            strcat(bufferString, nid);
+            remN(bufferString);
+
+            send(create_socket, bufferString, strlen (bufferString), 0);
+            char readBuffer[BUF] = "";
+            read(create_socket , readBuffer, 1000); 
+            printf("\n%s\n", readBuffer ); 
+         }else if(startsWith("del", command) == true) {
+            char username[10] = "";  
+            char nachrichtennummer[82] = "";
+            char bufferString[BUF] = "del";
+            char p[22] = "";
+
+            printf("\x1b[35m<Username max. 8 Zeichen>\x1b[0m\n");
+            fgets (username, 10, stdin);
+            printf("\x1b[35m<Posteingang oder Postausgang>\x1b[0m\n");
+            fgets (p, 22, stdin);
+            printf("\x1b[35m<Nachrichten-Nummer>\x1b[0m\n");
+            fgets (nachrichtennummer, 82, stdin);
+
+            strcat(bufferString, ";");
+            strcat(bufferString, username);
+            strcat(bufferString, ";");
+            strcat(bufferString, p);
+            strcat(bufferString, ";");
+            strcat(bufferString, nachrichtennummer);
+            remN(bufferString);
+            send(create_socket, bufferString, strlen (bufferString), 0);
+            char readBuffer[BUF] = "";
+            read(create_socket , readBuffer, 1024); 
+            printf("\n%s\n", readBuffer ); 
+         }else if(startsWith("quit", command) == true) {
+            strcpy(buffer, "quit\n");
+         }else {
+            printf("DAS IST KEIN COMMAND!!!!!");
+         }
       }
-     }
+   }while (strcmp (buffer, "quit\n") != 0);
-
+   close (create_socket);
-      
+   return EXIT_SUCCESS;
-
-     
-  } 
-  while (strcmp (buffer, "quit\n") != 0);
-  close (create_socket);
-  return EXIT_SUCCESS;
 }

readme.md

@@ -2,11 +2,43 @@
 # Protokoll 🔧
 
 ```
-LOGIN: login;username;passwort
+Als erstes muss der User immer der Befehl eingegeben (send, read, list oder delete). Danach schreibt der Client 
+immer eine Zeile, was der User als nächstes eingeben soll. Die Buffer Strings der Befehle sind folgerndermaßen 
+aufgebaut:
+
 SEND: send;sender;empänger;betreff;nachricht
-LIST: list:username;postEinAusgang
+LIST: list;username;postEinAusgang
 READ: read;username;postEinAusgang;nid
 DEL: del;username;postEinAusgang;nid
+
+Der Buffer wird immer als Ganzes (wie oben beschrieben) vom Client an den Server übertragen (nicht Blockweise).
+Der Client fügt die Usereingaben als String zusammen und trennt sie mit einem ";". Der Server splittet den Befehl
+dann anhand des Delimiters ";" und geht jedes einzelne Attribut (z.B. username, nid) in einer Schleife durch und
+führt den entsprechende Aktionen aus. Als erstes Attribut steht immer der Befehl, damit der Server sofort erkennt,
+welche Aktion er ausführen soll. Die nid (Nachrichten ID) wird am Server erzeugt und setzt sich aus einem Timestamp
++ dem Betreff zusammen.
+
+Bei send und delete sendet der Server entweder OK oder ERR zurück. Bei list, die Anzahl der Nachrichten und pro
+Zeile den Betreff. Bei read wird die gesamte Nachricht (nid, Sent From/To, Betreff, Nachricht) zurückgesendet.
+
+Am Server gibt es die Verzeichnisse Posteingang und Postausgang. Darin sind Verzeichniss mit den jeweiligen
+Usernamen und darin befinden sich .txt Dateien mit den Nachrichten.
+
+Eine Nachricht wird zb. folgerndermaßen am Server gespeichert:
+
+ID: 2020-10-2918:05:32hallo
+Sent to: if20b206
+Betreff: hallo
+Message: wie gehts
+
+```
+
+# Installation
+```
+sudo apt-get install ldap-utils
+sudo apt-get install libldap
+sudo apt-get update -y
+sudo apt-get install -y libldap-dev
 ```
 
 # Erstellt von 

server.c

@@ -18,44 +18,284 @@
 #include <termios.h>
 
 #define MAXCHAR 1000
-
 #define BUF 1024
+char *verzeichnis;
 
-bool startsWith(const char *pre, const char *str)
+// Entfernt das \n und macht \0 daraus
-{
+void remN(char *s) {
-    size_t lenpre = strlen(pre),
+    char *p2 = s;
-           lenstr = strlen(str);
+    while(*s != '\0') {
-    return lenstr < lenpre ? false : memcmp(pre, str, lenpre) == 0;
+        if(*s != '\t' && *s != '\n') {
+            *p2++ = *s++;
+        } else {
+            ++s;
+        }
+    }
+    *p2 = '\0';
 }
 
-void mstore_data(const char *filepath, const char *data)
+//Checkt ob ein dir bereits existiert
-{
+bool dirExists(const char path[300]){
-    FILE *fp = fopen(filepath, "ab");
+   struct stat st = {0};
-    if (fp != NULL)
+   char cwd[300];
-    {
+   if (getcwd(cwd, sizeof(cwd)) != NULL) {
-        fputs(data, fp);
+      //printf("Current working dir: %s\n", cwd);
-        fclose(fp);
+   } else {
-    }
+      perror("getcwd() error");
+   }
+   strcat(cwd, path);
+   if (stat(cwd, &st) == 0) {
+      printf("\x1b[32mDir: %s exists!\x1b[0m\n", cwd);
+      return true;
+   }else
+   {
+      printf("\x1b[31mDir: %s gibt es NICHT!\x1b[0m\n", cwd);
+      return false;
+   }
+}
+
+//Erstellt ein Dir wenn nicht bereits vorhanden
+void createDir(const char dir[]){
+   if(dirExists(dir) == false){
+      char cwd[300];
+      if (getcwd(cwd, sizeof(cwd)) != NULL) {
+      //printf("Current working dir: %s\n", cwd);
+      } else {
+         perror("getcwd() error");
+      }
+      strcat(cwd, dir);
+      if(mkdir(cwd, 0700) == -1)
+      {
+         printf("\x1b[31mFailed to create %s\x1b[0m\n", cwd);
+         perror("mkdir");
+         exit(EXIT_FAILURE);
+      }
+      else{
+         printf("\x1b[33mCreated directory: %s\x1b[0m\n", cwd);
+      }
+   }
+}
+
+// Die Denyfiles werden gelöscht -1 ist error
+int stopDenyUser(char username[10]){
+   char cwd[300];
+   if (getcwd(cwd, sizeof(cwd)) != NULL) {
+      //printf("Current working dir: %s\n", cwd);
+   } else {
+      perror("getcwd() error");
+   }
+   strcat(cwd, "/");
+   strcat(cwd, verzeichnis);
+   strcat(cwd, "/deny/");
+   strcat(cwd, username);
+   DIR *d = opendir(cwd);
+   size_t path_len = strlen(cwd);
+   int r = -1;
+   if (d) {
+      struct dirent *p;
+      r = 0;
+      while (!r && (p=readdir(d))) {
+         int r2 = -1;
+         char *buf;
+         size_t len;
+         /* Skip the names "." and ".." as we don't want to recurse on them. */
+         if (!strcmp(p->d_name, ".") || !strcmp(p->d_name, ".."))
+            continue;
+         len = path_len + strlen(p->d_name) + 2; 
+         buf = malloc(len);
+         if (buf) {
+            struct stat statbuf;
+            snprintf(buf, len, "%s/%s", cwd, p->d_name);
+            if (!stat(buf, &statbuf)) {
+               if (S_ISDIR(statbuf.st_mode))
+                  r2 = stopDenyUser(buf);
+               else
+                  r2 = unlink(buf);
+            }
+            free(buf);
+         }
+         r = r2;
+      }
+      closedir(d);
+   }
+   if (!r)
+      r = rmdir(cwd);
+   return r;
+}
+
+// Zählt wv denys ein user bereits hat
+int countDenyUser(char username[10]){
+   char dir[50];
+   strcpy(dir, "/");
+   strcat(dir, verzeichnis);
+   strcat(dir, "/deny/");
+   strcat(dir, username);
+   if (dirExists(dir) == false)
+   {
+      printf("\x1b[31mDIR Exists NICHT!\x1b[0m\n");
+      return 0;
+   }else
+   {
+      int file_count = 0;
+      DIR * dirp;
+      struct dirent * entry;
+
+      char cwd[1000];
+      if (getcwd(cwd, sizeof(cwd)) != NULL) {
+         //printf("Current working dir: %s\n", cwd);
+      } else {
+         perror("getcwd() error");
+      }
+      strcat(cwd, "/");
+      strcat(cwd, verzeichnis);
+      strcat(cwd, "/deny/");
+      strcat(cwd, username);
+      dirp = opendir(cwd); /* There should be error handling after this */
+      while ((entry = readdir(dirp)) != NULL) {
+         if (entry->d_type == DT_REG) { /* If the entry is a regular file */
+            file_count++;
+         }
+      }
+      closedir(dirp);
+      return file_count;
+   }
+}
+
+// Wenn der User 3 Deny Files hat, ist er gesperrt und es kommt true zurück
+bool userDenied(char username[10]){
+   if (countDenyUser(username) == 3)
+   {
+      printf("\x1b[31mUser: %s ist gesperrt!\x1b[0m\n", username);
+      return true;
+   }else
+   {
+      printf("\x1b[32mUser: %s ist NICHT gesperrt!\x1b[0m\n", username);
+      return false;
+   }
+}
+
+// Erstellt ein Deny User eintrag
+void createDenyUser(char username[10]){
+   char filename[1000];
+   strcpy(filename, "/");
+   strcat(filename, verzeichnis);
+   strcat(filename, "/deny/");
+   strcat(filename, username);
+   createDir(filename);
+   FILE *fp;
+   // Datum besorgen
+   char timeStr[22];
+   time_t now = time(NULL);
+   struct tm *t = localtime(&now);
+   strftime(timeStr, sizeof(timeStr)-1, "%H:%M:%S", t);
+   char cwd[300];
+   if (getcwd(cwd, sizeof(cwd)) != NULL) {
+      //printf("Current working dir: %s\n", cwd);
+   } else {
+      perror("getcwd() error");
+   }
+   // Filename erstellen
+   strcpy(filename, cwd);
+   strcat(filename, "/");
+   strcat(filename, verzeichnis);
+   strcat(filename, "/deny/");
+   strcat(filename, username);
+   strcat(filename,"/");
+   strcat(filename,timeStr);
+   strcat(filename, ".txt");
+   // File erstellen
+   fp = fopen(filename, "w");
+   if(fp == NULL){
+      perror("fopen");
+   }
+   fprintf(fp, "DENY");
+   fclose(fp);
+}
+
+// True wenn der user wieder zugelassen werden darf
+bool checkDeniedUser(char username[10]){
+   time_t now;
+   time(&now);
+   struct tm*local = localtime(&now);
+   int readHour = 0, readMinutes = 0, readSekundes = 0;
+   char cwd[1000];
+   if (getcwd(cwd, sizeof(cwd)) != NULL) {
+      //printf("Current working dir: %s\n", cwd);
+   } else {
+      perror("getcwd() error");
+   }
+   strcat(cwd, "/");
+   strcat(cwd, verzeichnis);
+   strcat(cwd, "/deny/");
+   strcat(cwd, username);
+   DIR *d;
+   struct dirent *dir;
+   d = opendir(cwd);
+   if (d)
+   {
+      while ((dir = readdir(d)) != NULL)
+      {
+         if(strcmp(dir->d_name, ".") != 0 && strcmp(dir->d_name, "..") != 0){
+               //printf("%s\n", dir->d_name);
+               sscanf(dir->d_name, "%2d:%2d:%2d", &readHour, &readMinutes, &readSekundes);
+               struct tm breakdown = {0};
+               breakdown.tm_sec = readSekundes;
+               breakdown.tm_hour = readHour;
+               breakdown.tm_min = readMinutes;
+               breakdown.tm_year = local->tm_year;
+               breakdown.tm_mon = local->tm_mon;
+               breakdown.tm_mday = local->tm_mday;
+               time_t result;
+               
+               if ((result = mktime(&breakdown)) == (time_t)-1) {
+                  fprintf(stderr, "Could not convert time input to time_t\n");
+                  perror("checkDeniedUser Read time from file");
+               }
+               double diff_t;
+               diff_t = difftime(now, result);
+               printf("\x1b[34mZeitdifferenz: %f\x1b[0m\n", diff_t);
+               if (diff_t >= 300 || diff_t <= -300) //300 = 5min
+               {
+                  return true;
+               }
+         }
+      }
+      closedir(d);
+   }
+   return false;
+}
+
+bool startsWith(const char *pre, const char *str){
+   size_t lenpre = strlen(pre),
+         lenstr = strlen(str);
+   return lenstr < lenpre ? false : memcmp(pre, str, lenpre) == 0;
+}
+
+void mstore_data(const char *filepath, const char *data){
+   FILE *fp = fopen(filepath, "ab");
+   if (fp != NULL)
+   {
+      fputs(data, fp);
+      fclose(fp);
+   }
 }
 
 int countFiles(char path[]) {
-    int file_count = 0;
+   int file_count = 0;
-    DIR * dirp;
+   DIR * dirp;
-    struct dirent * entry;
+   struct dirent * entry;
 
-    dirp = opendir(path); /* There should be error handling after this */
+   dirp = opendir(path); 
-    while ((entry = readdir(dirp)) != NULL) {
+   while ((entry = readdir(dirp)) != NULL) {
-        if (entry->d_type == DT_REG) { /* If the entry is a regular file */
+      if (entry->d_type == DT_REG) { 
-            file_count++;
+         file_count++;
-        }
+      }
-    }
+   }
-    closedir(dirp);
+   closedir(dirp);
-
+   return file_count;
-    return file_count;
 }
 
-int login_user(char username[8], char pw[50])
+int login_user(char username[10], char pw[50]){
-{
     ////////////////////////////////////////////////////////////////////////////
     // LDAP config
     // anonymous bind with user and pw empty
@@ -67,14 +307,10 @@ int login_user(char username[8], char pw[50])
     char rawLdapUser[128];
     strcpy(rawLdapUser, username);
     sprintf(ldapBindUser, "uid=%s,ou=people,dc=technikum-wien,dc=at", rawLdapUser);
-    printf("user set to: %s\n", ldapBindUser);
-
 
     // read password (bash: export ldappw=<yourPW>)
     char ldapBindPassword[256];
     strcpy(ldapBindPassword, pw);
-    printf("pw taken over from commandline: %s\n", pw);
-   
 
    // search settings
    const char *ldapSearchBaseDomainComponent = "dc=technikum-wien,dc=at";
@@ -95,7 +331,7 @@ int login_user(char username[8], char pw[50])
       fprintf(stderr, "ldap_init failed\n");
       return 0;
    }
-   printf("connected to LDAP server %s\n", ldapUri);
+   printf("\x1b[32mconnected to LDAP server %s\x1b[0m\n", ldapUri);
 
    ////////////////////////////////////////////////////////////////////////////
    // set verison options
@@ -208,7 +444,7 @@ int login_user(char username[8], char pw[50])
       return 0;
    }
    // https://linux.die.net/man/3/ldap_count_entries
-   printf("Total results: %d\n", ldap_count_entries(ldapHandle, searchResult));
+   printf("\x1b[34mTotal results: %d\x1b[0m\n", ldap_count_entries(ldapHandle, searchResult));
 
    ////////////////////////////////////////////////////////////////////////////
    // get result of search
@@ -222,7 +458,7 @@ int login_user(char username[8], char pw[50])
       /////////////////////////////////////////////////////////////////////////
       // Base Information of the search result entry
       // https://linux.die.net/man/3/ldap_get_dn
-      printf("DN: %s\n", ldap_get_dn(ldapHandle, searchResultEntry));
+      printf("\x1b[35mDN: %s\x1b[0m\n", ldap_get_dn(ldapHandle, searchResultEntry));
 
       /////////////////////////////////////////////////////////////////////////
       // Attributes
@@ -244,10 +480,10 @@ int login_user(char username[8], char pw[50])
          {
             for (int i = 0; i < ldap_count_values_len(vals); i++)
             {
-               printf("\t%s: %s\n", searchResultEntryAttribute, vals[i]->bv_val);
+               printf("\t\x1b[35m%s: %s\x1b[0m\n", searchResultEntryAttribute, vals[i]->bv_val);
                if(strcmp(searchResultEntryAttribute,"uid") == 0){
                    if(strcmp(vals[i]->bv_val,rawLdapUser) == 0){                        
-                        printf("\n\nGEFUNDEN!!!!!!!!!!!!!!!!!\n\n");
+                        printf("\n\n\x1b[32mGEFUNDEN!!!!!!!!!!!!!!!!!\x1b[0m\n\n");
                         // Free Memory
                         ldap_value_free_len(vals);
                         ldap_memfree(searchResultEntryAttribute);
@@ -307,6 +543,7 @@ void *threadFun(void *arg){
            buffer[size] = '\0';
             if (login == false)
             {
+               
                // Do login
                if (strncmp("login", buffer, 5) == 0)
                {
@@ -315,7 +552,7 @@ void *threadFun(void *arg){
                   //den buffer mit dem seperator splitten
                   ptr = strtok(buffer, delimiter);
                   int counter = 0;
-                  char username[9];
+                  char username[10];
                   char pw[50];
                   while(ptr != NULL) {
                      if (counter == 1) {
@@ -329,17 +566,38 @@ void *threadFun(void *arg){
                      ptr = strtok(NULL, delimiter);
                   }
                   if(login_user(username, pw) == 1){
-                     login = true;
+                     printf("\x1b[32mUser: %s hat den Login geschafft!!\x1b[0m\n", username);
-                     printf("Login geschafft!!");
+                     if(checkDeniedUser(username) == true){
-                     //OK an den client zurücksenden
+                           stopDenyUser(username);
-                     char suc[] = "OK";
+                     }
-                     send(new_socket , suc , strlen(suc) , 0 );
+                     if(userDenied(username) == true){
+                        //ERR an den client zurücksenden
+                        char err[] = "Client Gesperrt";
+                        send(new_socket , err , strlen(err) , 0 );
+                     }else{
+                        //OK an den client zurücksenden
+                        char suc[] = "OK";
+                        login = true;
+                        send(new_socket , suc , strlen(suc) , 0 );
+                        stopDenyUser(username);
+                     }
                   }else
                   {
-                     printf("Login error!!!");
+                     printf("\x1b[31mUser: %s hat den Login NICHT geschafft!!\x1b[0m\n", username);
-                     //OK an den client zurücksenden
+
-                     char err[] = "ERR";
+                     if(userDenied(username) == false){
-                     send(new_socket , err , strlen(err) , 0 );
+                        createDenyUser(username);
+                        //ERR an den client zurücksenden
+                        char err[] = "ERR";
+                        send(new_socket , err , strlen(err) , 0 );
+                     }else{
+                        //ERR an den client zurücksenden
+                        char err[] = "Client Gesperrt";
+                        send(new_socket , err , strlen(err) , 0 );
+                        if(checkDeniedUser(username) == true){
+                           stopDenyUser(username);
+                        }
+                     }
                   }
                   
                }
@@ -355,14 +613,14 @@ void *threadFun(void *arg){
                   ptr = strtok(buffer, delimiter);
 
                   int counter = 0;
-                  char sender[8] = "";
+                  char sender[10] = "";
-                  char empfaenger[8] = "";
+                  char empfaenger[10] = "";
-                  char betreff[80] = "";
+                  char betreff[82] = "";
 
                   //timestamp als ersten teil der id erstellen
-                  char ts[20];
+                  char ts[22];
                   time_t now = time(NULL);
-                  strftime(ts, 20, "%Y-%m-%d%H:%M:%S", localtime(&now));
+                  strftime(ts, 22, "%Y-%m-%d%H:%M:%S", localtime(&now));
                   
 
                   //den gesplitteten buffer schritt für schritt durchgehen
@@ -405,7 +663,7 @@ void *threadFun(void *arg){
                         strcat(ts, betreff);
 
                         //Pfad erstellen für den sender und file erstellen
-                        char fb[100] = "touch ./data/postausgang/";
+                        char fb[300] = "touch ./data/postausgang/";
                         strcat(fb, "/");
                         strcat(fb, sender);
                         strcat(fb, "/");
@@ -429,7 +687,7 @@ void *threadFun(void *arg){
                            //printf("4 %s \n", ptr);
 
                            //file content für den empfänger erstellen
-                           char fp[100] = "./data/posteingang/";
+                           char fp[300] = "./data/posteingang/";
                            char content1[1000] = "";
                            strcpy(content1, "ID: ");
                            strcat(content1, ts);
@@ -493,10 +751,10 @@ void *threadFun(void *arg){
 
                   int counter = 0;
 
-                  char username[8] = "";
+                  char username[10] = "";
-                  char nid[80] = "";
+                  char nid[82] = "";
-                  char p[20] = "";
+                  char p[22] = "";
-                  char path[100] = "";
+                  char path[300] = "";
 
                   while(ptr != NULL) {
 
@@ -548,10 +806,10 @@ void *threadFun(void *arg){
                   ptr = strtok(buffer, delimiter);
 
                   int counter = 0;
-                  char username[8] = "";
+                  char username[10] = "";
-                  char nid[80] = "";
+                  char nid[82] = "";
-                  char betreff[80] = "";
+                  char betreff[82] = "";
-                  char folder[20] = "";
+                  char folder[22] = "";
 
                   while(ptr != NULL) { 
 
@@ -619,9 +877,9 @@ void *threadFun(void *arg){
                   ptr = strtok(buffer, delimiter);
 
                   int counter = 0;
-                  char username[8] = "";
+                  char username[10] = "";
-                  char p[20] = "";
+                  char p[22] = "";
-                  char path[100] = "";
+                  char path[300] = "";
 
                   while(ptr != NULL) {
 
@@ -702,7 +960,7 @@ void *threadFun(void *arg){
         }
         else if (size == 0)
         {
-           printf("Client closed remote socket\n");
+           printf("\x1b[33mClient closed remote socket\x1b[0m\n");
            break;
         }
         else
@@ -743,16 +1001,32 @@ int main (int argc, char **argv) {
   
   addrlen = sizeof (struct sockaddr_in);
 
-  //Verzeichniss erstellen
+   //Verzeichnisse erstellen
+   verzeichnis = argv[2];
+   char tmpVerzeichnis[300];
+   strcpy(tmpVerzeichnis, "/");
+   strcat(tmpVerzeichnis, verzeichnis);
+   createDir(tmpVerzeichnis);
+   char denyDir[300];
+   strcpy(denyDir, tmpVerzeichnis);
+   strcat(denyDir, "/deny");
+   createDir(denyDir);
+   char postausgang[300];
+   char posteingang[300];
+   strcpy(postausgang, tmpVerzeichnis);
+   strcat(postausgang, "/postausgang");
+   strcpy(posteingang, tmpVerzeichnis);
+   strcat(posteingang, "/posteingang");
+   createDir(postausgang);
+   createDir(posteingang);
 
-  mkdir(argv[2], 0711);
   pthread_t tid;
   while (1) {
-     printf("Waiting for connections...\n");
+     printf("\x1b[34mWaiting for connections...\x1b[0m\n");
      new_socket = accept ( create_socket, (struct sockaddr *) &cliaddress, &addrlen );
      if (new_socket > 0)
      {
-        printf ("Client connected from %s:%d...\n", inet_ntoa (cliaddress.sin_addr),ntohs(cliaddress.sin_port));
+        printf ("\x1b[32mClient connected from %s:%d...\x1b[0m\n", inet_ntoa (cliaddress.sin_addr),ntohs(cliaddress.sin_port));
      }
      if (pthread_create(&tid, NULL, threadFun, &new_socket) != 0)
      {