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#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <errno.h>
#include <arpa/inet.h>
#include <netdb.h>
#include <unistd.h>
void init_sockets(void) {}
#define closesocket(s) close(s)
int server_socket = -1;
int sock = -1;
#define ZEILE_PLATZ 1024
char zeile[ZEILE_PLATZ];
void err_exit(char* msg)
{
if (server_socket != -1) closesocket(server_socket);
}
void server_socket_binden(short port)
{
struct sockaddr_in saddr;
if ((server_socket = socket(AF_INET, SOCK_STREAM, 0)) == -1) {
err_exit("socket() failed");
}
memset(&saddr, 0, sizeof(saddr));
saddr.sin_family = AF_INET;
saddr.sin_port = htons(port);
saddr.sin_addr.s_addr = INADDR_ANY;
if (bind(server_socket, (struct sockaddr*)&saddr, sizeof(saddr)) < 0) {
err_exit("bind() failed");
}
if (listen(server_socket, 5) < 0) {
err_exit("listen() failed");
}
}
void verbindung_annehmen(void)
{
if ((sock = accept(server_socket, NULL, 0)) < 0) {
err_exit("accept() failed");
}
}
int zeile_empf(void) // Zeile vom Socket in zeile lesen
{
int i = 0;
int len;
char c;
while (1) {
len = recv(sock, &c, 1, 0); // ein Zeichen lesen
if (len == -1) err_exit("recv() failed");
if (len == 0) return 0; // socket wurde von Gegenstelle geschlossen
if (c == 10) {
if (i >= 1 && zeile[i - 1] == 13) i--; // CR/LF abschneiden
break;
}
zeile[i] = c;
i++;
if (i == ZEILE_PLATZ - 1) break; // Zeile zu lang
}
zeile[i] = 0;
return 1;
}
void zeile_send(void)
{
strcat(zeile, "\x0d\x0a"); // CR/LF anhngen
if (send(sock, zeile, strlen(zeile), 0) == -1) {
err_exit("send() failed");
}
}
int main(void)
{
int n_access = 1;
init_sockets();
server_socket_binden(8080);
while (1) {
verbindung_annehmen();
while (1) {
zeile_empf();
printf("%s\n", zeile);
if (zeile[0] == 0) break;
}
// HTTP Header schicken (ab HTTP 1.0 ntig)
strcpy(zeile, "HTTP/1.0 200 OK\n");
strcat(zeile, "Content-Type: text/html\n");
zeile_send();
strcpy(zeile, "");
zeile_send();
// HTML-Seite schicken
strcpy(zeile,
"<html><body><h2>My Simple C Webserver</h2>");
zeile_send();
sprintf(zeile,
"Zugriff Nummer: %d </body></html>", n_access);
zeile_send();
strcpy(zeile, "");
zeile_send();
closesocket(sock);
sock = -1;
n_access++;
}
closesocket(server_socket);
return 0;
}