twmailer_vsys/client.c

/* 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;
}