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