pthread added

client.c

@@ -0,0 +1,255 @@
+/* myclient.c */
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <netinet/in.h>
+#include <arpa/inet.h>
+#include <unistd.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <stdbool.h>
+#define BUF 1024
+
+void remN(char *s) {
+    char *p2 = s;
+    while(*s != '\0') {
+        if(*s != '\t' && *s != '\n') {
+            *p2++ = *s++;
+        } else {
+            ++s;
+        }
+    }
+    *p2 = '\0';
+}
+
+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;
+}
+
+int main (int argc, char **argv) {
+
+  int create_socket;
+  char buffer[BUF];
+  struct sockaddr_in address;
+  int size;
+
+  if( argc < 3 ){
+     printf("Usage: %s ServerAdresse Port\n", argv[0]);
+     exit(EXIT_FAILURE);
+  }
+
+  if ((create_socket = socket (AF_INET, SOCK_STREAM, 0)) == -1)
+  {
+     perror("Socket error");
+     return EXIT_FAILURE;
+  }
+  
+  memset(&address,0,sizeof(address));
+  address.sin_family = AF_INET;
+  address.sin_port = htons (atoi(argv[2]));
+  inet_aton (argv[1], &address.sin_addr);
+
+  if (connect ( create_socket, (struct sockaddr *) &address, sizeof (address)) == 0)
+  {
+     printf ("Connection with server (%s) established\n", inet_ntoa (address.sin_addr));
+     size=recv(create_socket,buffer,BUF-1, 0);
+     if (size>0)
+     {
+        buffer[size]= '\0';
+        printf("%s",buffer);
+     }
+  }
+  else
+  {
+     perror("Connect error - no server available");
+     return EXIT_FAILURE;
+  }
+
+
+  do {
+     //command vom user überprüfen
+     char command[6] = "";
+     printf ("\nEnter Command: \n");
+     fgets (command, 6, stdin);
+
+      //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("<Sender max. 8 Zeichen>\n");
+         fgets (sender, 8, stdin);
+
+         printf("<Empfänger max. 8 Zeichen>\n");
+         fgets (empfaenger, 8, stdin);
+
+         printf("<Betreff max. 80 Zeichen>\n");
+         fgets (betreff, 80, stdin);
+
+         printf("<Nachricht, beliebige Anzahl an Zeilen>\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] = "";
+         int valread = 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("<Username max. 8 Zeichen>\n");
+         fgets (username, 8, stdin);
+         printf("<Posteingang oder Postausgang>\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] = "";
+         int valread = 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("<Anzahl der Nachrichten für den User: %s>\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("<Username max. 8 Zeichen>\n");
+         fgets (username, 8, stdin);
+         printf("<posteingang oder postausgang>\n");
+         fgets (folder, 20, stdin);
+         printf("<Nachrichten-Nummer>\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] = "";
+         int valread = 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("<Username max. 8 Zeichen>\n");
+         fgets (username, 8, stdin);
+         printf("<Posteingang oder Postausgang>\n");
+         fgets (p, 20, stdin);
+         printf("<Nachrichten-Nummer>\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] = "";
+         int valread = 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;
+}

makefile

@@ -0,0 +1,25 @@
+#Client und Server kompilieren
+all: server.c client.c
+	gcc server.c -o server -lpthread
+	gcc client.c -o client -lpthread
+	
+#Kompilierten Client und Server löschen	
+clean: client server
+	rm -f client server
+
+#Nur den Client kompilieren:
+client: client.c
+	gcc client.c -o client -lpthread
+
+#Nur den Server kompilieren:
+server: server.c
+	gcc server.c -o server -lpthread
+
+#Kompilierten Server löschen	
+cleanS: server
+	rm -f server
+
+#Kompilierten Client löschen	
+cleanC: client
+	rm -f client
+

myclient.c

@@ -1,104 +0,0 @@
-/* myclient.c */
-#include <sys/types.h>
-#include <sys/socket.h>
-#include <netinet/in.h>
-#include <arpa/inet.h>
-#include <unistd.h>
-#include <stdlib.h>
-#include <stdio.h>
-#include <string.h>
-#define BUF 1024
-#define PORT 6543
-
-int main (int argc, char **argv) {
-  char* meinport = argv[2];
-  int create_socket;
-  char buffer[BUF];
-  struct sockaddr_in address;
-  int size;
-
-  if( argc < 2 ){
-     printf("Usage: %s ServerAdresse\n", argv[0]);
-     exit(EXIT_FAILURE);
-  }
-
-  if ((create_socket = socket (AF_INET, SOCK_STREAM, 0)) == -1)
-  {
-     perror("Socket error");
-     return EXIT_FAILURE;
-  }
-  
-  memset(&address,0,sizeof(address));
-  address.sin_family = AF_INET;
-  address.sin_port = htons (*meinport);
-  inet_aton (argv[1], &address.sin_addr);
-  
-
-  if (connect ( create_socket, (struct sockaddr *) &address, sizeof (address)) == 0)
-  {
-     printf ("Connection with server (%s) established\n", inet_ntoa (address.sin_addr));
-     size=recv(create_socket,buffer,BUF-1, 0);
-     if (size>0)
-     {
-        buffer[size]= '\0';
-        printf("%s",buffer);
-     }
-  }
-  else
-  {
-     perror("Connect error - no server available");
-     return EXIT_FAILURE;
-  }
-
-   int last = 0;
-   int mode = 0;
-   char bufferString[1024];
-   do {
-      char *p=getenv("USER");
-      printf("\x1B[32m");
-      printf("%s@%s:%d", p, inet_ntoa (address.sin_addr),ntohs(address.sin_port));
-      if (strncmp (bufferString, "send", 4)  == 0 || mode == 1){
-         switch (last)
-         {
-         case 0:
-            last += 1;
-            mode = 1;
-            printf("\x1B[34m");
-            printf("->SEND->Sender eingeben: \n");
-            break;
-         case 1:
-            last += 1;
-            printf("\x1B[34m");
-            printf("->SEND->Empfänger eingeben: \n");
-            break;
-         case 2:
-            last += 1;
-            printf("\x1B[34m");
-            printf("->SEND->Betreff eingeben: \n");
-            break;
-         case 3:
-            last = 0;
-            mode = 0;
-            printf("\x1B[34m");
-            printf("->SEND->Nachricht eingeben: \n");
-            break;
-         }    
-      }else if (strncmp (bufferString, "list", 4)  == 0 ){
-         printf("LIST wurde endlich erkannt!\n");
-      }else if (strncmp (bufferString, "read", 4)  == 0 ){
-         printf("READ wurde endlich erkannt!\n");
-      } else if (strncmp (bufferString, "del", 4)  == 0 ){
-         printf("DEL wurde endlich erkannt!\n");
-      }
-      printf("\033[0;33m");
-      printf("$ ");
-      printf("\x1B[37m");
-      fgets (buffer, BUF, stdin);
-      strcpy(bufferString, buffer);
-      printf("%s", bufferString);
-      send(create_socket, buffer, strlen (buffer), 0);
-  } 
-  while (strcmp (buffer, "quit\n") != 0);
-  close (create_socket);
-  return EXIT_SUCCESS;
-}

myserver.c

@@ -1,115 +0,0 @@
-/* myserver.c */
-#include <sys/types.h>
-#include <sys/socket.h>
-#include <netinet/in.h>
-#include <arpa/inet.h>
-#include <unistd.h>
-#include <stdlib.h>
-#include <stdio.h>
-#include <string.h>
-#define BUF 1024
-#define PORT 6543
-
-int main (int argc, char **argv) {
-  char* verzeichnis = argv[1];
-  char* meinport = argv[2];
-  printf("Mein server Verzeichniss: %s\n", verzeichnis);
-  printf("Mein server Port: %s\n", meinport);
-  int create_socket, new_socket;
-  socklen_t addrlen;
-  char buffer[BUF];
-  int size;
-  struct sockaddr_in address, cliaddress;
-
-  create_socket = socket (AF_INET, SOCK_STREAM, 0);
-
-  memset(&address,0,sizeof(address));
-  address.sin_family = AF_INET;
-  address.sin_addr.s_addr = INADDR_ANY;
-  address.sin_port = htons (*meinport);
-
-  if (bind ( create_socket, (struct sockaddr *) &address, sizeof (address)) != 0) {
-     perror("bind error");
-     return EXIT_FAILURE;
-  }
-  listen (create_socket, 5);
-  
-  addrlen = sizeof (struct sockaddr_in);
-
-  while (1) {
-     printf("Waiting for connections...\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));
-        strcpy(buffer,"Welcome to myserver, Please enter your command:\n");
-        send(new_socket, buffer, strlen(buffer),0);
-     }
-      char bufferString[BUF];
-      int last = 0;
-      int mode = 0;
-      do {
-         size = read (new_socket, buffer, BUF-1);
-         if( size > 0)
-         {
-            buffer[size] = '\0';
-            strcpy(bufferString, buffer);
-            
-            if (strncmp (bufferString, "send", 4)  == 0 || mode == 1){
-               switch (last)
-                  {
-                  case 0:
-                     last += 1;
-                     mode = 1;
-                     printf("\x1B[34m");
-                     printf("->SEND:\x1B[33m %s\n", bufferString);
-                     break;
-                  case 1:
-                     last += 1;
-                     printf("\x1B[34m");
-                     printf("->SEND->Sender wurde eingegeben:\x1B[33m %s\n", bufferString);
-                     break;
-                  case 2:
-                     last += 1;
-                     printf("\x1B[34m");
-                     printf("->SEND->Empfänger wurde eingegeben:\x1B[33m %s\n", bufferString);
-                     break;
-                  case 3:
-                     last += 1;
-                     printf("\x1B[34m");
-                     printf("->SEND->Betreff wurde eingegeben:\x1B[33m %s\n", bufferString);
-                     break;
-                  case 4:
-                     last = 0;
-                     mode = 0;
-                     printf("\x1B[34m");
-                     printf("->SEND->Nachricht wurde eingegeben:\x1B[33m %s\n", bufferString);
-                     break;
-                  }    
-            }else if (strncmp (bufferString, "list", 4)  == 0 ){
-               printf("LIST wurde endlich erkannt!\n");
-            }else if (strncmp (bufferString, "read", 4)  == 0 ){
-               printf("READ wurde endlich erkannt!\n");
-            } else if (strncmp (bufferString, "del", 4)  == 0 ){
-               printf("DEL wurde endlich erkannt!\n");
-            }else {
-               printf ("\x1B[33mBefehl wurde nicht erkannt: \x1B[31m%s\n", bufferString);
-            }
-            printf("\x1B[37m");
-         }
-         else if (size == 0)
-         {
-            printf("Client closed remote socket\n");
-            break;
-         }
-         else
-         {
-            perror("recv error");
-            return EXIT_FAILURE;
-         }
-      } while ( strncmp (buffer, "quit", 4)  != 0); 
-     close (new_socket);
-  }
-  close (create_socket);
-  return EXIT_SUCCESS;
-}

readme.md

@@ -0,0 +1,14 @@
+
+# Protokoll 🔧
+
+```
+SEND: send;sender;empänger;betreff;nachricht
+LIST: list:username;postEinAusgang
+READ: read;username;postEinAusgang;nid
+DEL: del;username;postEinAusgang;nid
+```
+
+# Erstellt von 
+
+* Lukas Nowy
+* Georg Reisinger

server.c

@@ -0,0 +1,492 @@
+/* myserver.c */
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <netinet/in.h>
+#include <arpa/inet.h>
+#include <unistd.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <unistd.h>
+#include <sys/types.h>  /* Linux/UNIX */
+#include <sys/stat.h>   /* Linux/UNIX */
+#include <stdbool.h>
+#include <dirent.h>
+#include <time.h>
+#include <pthread.h>
+#define MAXCHAR 1000
+
+#define BUF 1024
+
+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;
+    DIR * dirp;
+    struct dirent * entry;
+
+    dirp = opendir(path); /* 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;
+}
+
+void *threadFun(void *arg){
+   int new_socket = *((int *)arg);
+   char buffer[BUF];
+   pthread_detach(pthread_self());
+   if(new_socket > 0){
+      strcpy(buffer, "Welcome to myserver, Please enter your command:\n");
+      send(new_socket, buffer, strlen(buffer),0);
+   }
+   do {
+        int size = recv (new_socket, buffer, BUF-1, 0);
+        if( size > 0)
+        {
+
+           buffer[size] = '\0';
+
+            //Überprüfen welchen command der client eingegeben hat,
+            // wenn command nicht zutreffend error zurücksenden
+            if(startsWith("send", buffer) == true) {
+
+               char delimiter[] = ";";
+               char *ptr;
+               //den buffer mit dem seperator splitten
+               ptr = strtok(buffer, delimiter);
+
+               int counter = 0;
+               char filename1[] = "";
+               char filename2[] = "";
+               char sender[8] = "";
+               char content[] = "";
+               char empfaenger[8] = "";
+               char betreff[80] = "";
+               char nid[100] = "";
+
+               //timestamp als ersten teil der id erstellen
+               char ts[20];
+               time_t now = time(NULL);
+               strftime(ts, 20, "%Y-%m-%d%H:%M:%S", localtime(&now));
+               
+
+               //den gesplitteten buffer schritt für schritt durchgehen
+               while(ptr != NULL) {
+	               //printf("Abschnitt gefunden: %s\n", ptr);
+                  //sender auslesen, ordner für sender erstellen, wenn nicht vorhanden
+                  if (counter == 1) {
+                     struct stat st = {0};
+                     char dir[] = "./data/postausgang/";
+                     strcat(dir, ptr);
+
+                     if (stat(dir, &st) == -1) {
+                        mkdir(dir, 0700);
+                     }
+
+                     strcat(sender, ptr);
+                     printf("1 %s \n", ptr);
+                  }
+                  
+                  //empfänger auslesen, ordner für empfänger erstellen, wenn nicht vorhanden
+                  if (counter == 2) {
+                     struct stat st2 = {0};
+                     char dir2[] = "./data/posteingang/";
+                     strcat(dir2, ptr);
+
+                     if (stat(dir2, &st2) == -1) {
+                        mkdir(dir2, 0700);
+                     }
+
+                     strcat(empfaenger, ptr);
+                     printf("2 %s \n" , ptr);
+                  }
+
+                  //betreff auslesen, id (ts) fertigstellen,  
+                  //2 dateien erstellen für sender und empfänger mit ts als filename
+                  if (counter == 3) {
+                     //printf("3 %s \n", ptr);
+
+                     strcat(betreff, ptr);
+                     strcat(ts, betreff);
+
+                     //Pfad erstellen für den sender und file erstellen
+                     char fb[100] = "touch ./data/postausgang/";
+                     strcat(fb, "/");
+                     strcat(fb, sender);
+                     strcat(fb, "/");
+                     strcat(fb, ts);
+                     printf("PATH: %s \n", fb);
+                     system(fb);
+
+                     //Pfad erstellen für den empfänger und file erstellen
+                     strcpy(fb, "touch ./data/posteingang/");
+                     strcat(fb, "/");
+                     strcat(fb, empfaenger);
+                     strcat(fb, "/");
+                     strcat(fb, ts);
+                     printf("PATH: %s \n", fb);
+                     system(fb);
+
+                  }
+
+                  //buffer in files schreiben
+                  if (counter == 4) {
+                        //printf("4 %s \n", ptr);
+
+                        //file content für den empfänger erstellen
+                        char fp[100] = "./data/posteingang/";
+                        char content1[1000] = "";
+                        strcpy(content1, "ID: ");
+                        strcat(content1, ts);
+                        strcat(content1, "\n");
+                        strcat(content1, "Received from: ");
+                        strcat(content1, sender);
+                        strcat(content1, "\n");
+                        strcat(content1, "Betreff: ");
+                        strcat(content1, betreff);
+                        strcat(content1, "\n");
+                        strcat(content1, "Message: ");
+                        strcat(content1, ptr); 
+
+                        strcat(fp, empfaenger);
+                        strcat(fp, "/");
+                        strcat(fp, ts);
+                        //content in das file storen
+                        mstore_data(fp, content1);
+
+                        //file content für den sender erstellen
+                        char content2[1000] = "";
+                        strcpy(content2, "ID: ");
+                        strcat(content2, ts);
+                        strcat(content2, "\n");
+                        strcat(content2, "Sent to: ");
+                        strcat(content2, empfaenger);
+                        strcat(content2, "\n");
+                        strcat(content2, "Betreff: ");
+                        strcat(content2, betreff);
+                        strcat(content2, "\n");
+                        strcat(content2, "Message: ");
+                        strcat(content2, ptr);
+
+                        strcpy(fp, "./data/postausgang/");
+                        strcat(fp, sender);
+                        strcat(fp, "/");
+                        strcat(fp, ts);
+                        //content2 in das file storen
+                        mstore_data(fp, content2);
+
+                  }
+                  counter = counter + 1;
+	               // naechsten Abschnitt erstellen
+ 	               ptr = strtok(NULL, delimiter);
+
+               }
+
+               //printf ("\n Message received: \n %s", buffer);
+               //OK an den client zurücksenden
+               char suc[] = "OK";
+               send(new_socket , suc , strlen(suc) , 0 );
+
+            }
+
+            else if(startsWith("del", buffer) == true) {
+               printf("delete: %s ", buffer);
+
+               char delimiter[] = ";";
+               char *ptr;
+               ptr = strtok(buffer, delimiter);
+
+               int counter = 0;
+
+               char username[8] = "";
+               char nid[80] = "";
+               char p[20] = "";
+               char path[100] = "";
+
+               while(ptr != NULL) {
+
+                  //username speichern
+                  if(counter == 1) {
+                     strcat(username, ptr);
+                  }
+
+                  //post ein- oder ausgang speichern
+                  if(counter == 2) {
+                     strcpy(p, ptr);
+                  }
+
+                  //nid speichern, den path string erstellen, rm -rf path ausführen
+                  if(counter == 3) {
+                     strcat(nid, ptr);
+                     if(strcmp(p, "postausgang") == 0) {
+                        strcpy(path, "rm -rf ./data/postausgang/");
+                     }
+
+                     if(strcmp(p, "posteingang") == 0) {
+                        strcpy(path, "rm -rf ./data/posteingang/");
+                     }
+                     
+                     strcat(path, username);
+                     strcat(path, "/");
+                     strcat(path, nid);
+
+                     system(path);
+                  }
+                  counter = counter + 1;
+
+                  // naechsten Abschnitt erstellen
+ 	               ptr = strtok(NULL, delimiter);
+               }
+
+            //OK an client zurücksenden
+            char resBuff[BUF] = "OK\n";
+            send(new_socket, resBuff, strlen(resBuff),0);
+            strcpy(buffer, "");
+
+            }
+
+            //read
+            else if(startsWith("read", buffer) == true) {
+
+               char delimiter[] = ";";
+               char *ptr;
+               ptr = strtok(buffer, delimiter);
+
+               int counter = 0;
+               char username[8] = "";
+               char nid[80] = "";
+               char betreff[80] = "";
+               char folder[20] = "";
+
+               while(ptr != NULL) { 
+
+                  if(counter == 1) {
+                     //username speichern
+                     strcat(username, ptr);
+                  }
+
+                  //postein- oder ausgang speichern
+                  if(counter == 2) {
+                        strcpy(folder, ptr);
+                  }
+
+                  //nid speichern, file mit dem path lesen und an client zzrücksenden
+                  if(counter == 3) {
+                     //nid
+                     strcat(nid, ptr);
+                     strcpy(betreff, nid);
+                     
+
+                     char filename[] = "./data/";
+                     strcat(filename, folder);
+                     strcat(filename, "/");
+
+                     strcat(filename, username);
+                     strcat(filename, "/");
+                     strcat(filename, nid);
+                     printf("PATH: %s", filename);
+ 
+                     FILE *ptr_file;
+                     char buf[1000];
+                     char res[1000];
+
+                     ptr_file = fopen(filename,"r");
+                     if (!ptr_file)
+                        perror("File Open error!");
+
+                     while (fgets(buf,1000, ptr_file)!=NULL) {
+                        strcat(res, buf);
+                     }
+
+
+		               fclose(ptr_file);
+
+                     
+                     // and send that buffer to client 
+
+                     printf("%s", res);
+                     send(new_socket , res, strlen(res), 0 );
+
+                  }
+
+                  counter = counter + 1;
+
+                  // naechsten Abschnitt erstellen
+ 	               ptr = strtok(NULL, delimiter);
+               }
+            }
+
+            //list
+            else if(startsWith("list", buffer) == true) {
+
+               char delimiter[] = ";";
+               char *ptr;
+               ptr = strtok(buffer, delimiter);
+
+               int counter = 0;
+               char username[8] = "";
+               char p[20] = "";
+               char path[100] = "";
+
+               while(ptr != NULL) {
+
+                  //username speichern
+                  if(counter == 1) {
+                     strcat(username, ptr);
+                  }
+
+                  //postein - oder ausgang speichern
+                  if(counter == 2) {
+                     strcat(p, ptr);
+
+                     if(strcmp(p, "postausgang") == 0) {
+                        strcpy(path, "./data/postausgang/");
+                     }
+
+                     if(strcmp(p, "posteingang") == 0) {
+                        strcpy(path, "./data/posteingang/");
+                     }
+                     
+                     strcat(path, username);
+                     strcat(path, "/");
+
+                     DIR *d;
+                     struct dirent *dir;
+                     char filenames[1000] = "";
+
+                     //Messages zählen
+                     int fc = countFiles(path);
+                     char str[1000];
+                     //int in string konverten
+                     sprintf(str, "%d", fc);
+
+                     strcat(filenames, str);
+                     strcat(filenames, ";");
+
+                     //file lesen
+                     d = opendir(path);
+
+                     if (d)
+                     {
+
+                        while ((dir = readdir(d)) != NULL)
+                        {
+                           strcat(filenames, dir->d_name);
+                           strcat(filenames, ";");
+                        }
+
+                     closedir(d);
+
+                     //an client senden
+                     send(new_socket , filenames , strlen(filenames) , 0 );
+                     strcpy(buffer, "");
+
+                     }
+
+                  }
+
+
+                  counter = counter + 1;
+
+                  // naechsten Abschnitt erstellen
+ 	               ptr = strtok(NULL, delimiter);
+               }
+
+
+            }else {
+               printf("error");
+               char err[] = "ERR";
+               send(new_socket , err , strlen(err) , 0 );
+
+            }
+
+            //printf ("\n content: \n %s", buffer);
+
+
+        }
+        else if (size == 0)
+        {
+           printf("Client closed remote socket\n");
+           break;
+        }
+        else
+        {
+           perror("recv error");
+           char err[] = "ERR";
+           send(new_socket , err , strlen(err) , 0 );
+        }
+
+     } while (strncmp (buffer, "quit", 4)  != 0);
+     close (new_socket);
+     pthread_exit(NULL);
+}
+
+
+int main (int argc, char **argv) {
+  int create_socket, new_socket;
+  socklen_t addrlen;
+  char buffer[BUF];
+  int size;
+  struct sockaddr_in address, cliaddress;
+
+  if( argc < 3 ){
+     printf("Usage: %s S Port Verzeichniss\n", argv[0]);
+     exit(EXIT_FAILURE);
+  }
+
+  create_socket = socket (AF_INET, SOCK_STREAM, 0);
+
+  memset(&address,0,sizeof(address));
+  address.sin_family = AF_INET;
+  address.sin_addr.s_addr = INADDR_ANY;
+  address.sin_port = htons (atoi(argv[1]));
+
+  if (bind ( create_socket, (struct sockaddr *) &address, sizeof (address)) != 0) {
+     perror("bind error");
+     return EXIT_FAILURE;
+  }
+  listen (create_socket, 5);
+  
+  addrlen = sizeof (struct sockaddr_in);
+
+  //Verzeichniss erstellen
+
+  mkdir(argv[2], 0711);
+  pthread_t tid;
+  int i = 0;
+  while (1) {
+     printf("Waiting for connections...\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));
+     }
+     if (pthread_create(&tid, NULL, threadFun, &new_socket) != 0)
+     {
+        perror("Failed to create thread");
+        exit(EXIT_FAILURE);
+     }
+  }
+  close (create_socket);
+  return EXIT_SUCCESS;
+}