proggen.org

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prog fritz.box /css/rd/login.css

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prog raspi.im.lan /bla/bla.txt

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#include <stdio.h>
#include <errno.h>
#include <string.h>
#include <stdlib.h>
/* Windows-System */
#ifdef _WIN32
#include <winsock.h>
#include <io.h>
/* Unix-System */
#else
#include <sys/socket.h>
#include <sys/types.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <netdb.h>
#include <unistd.h>
#endif
#define HTTP_PORT 80

int main(int argc, char **argv){
	int sock;
	struct sockaddr_in host_addr;
	struct hostent *hostinfo;
	char *host, *file;
	char command[1024];
	char buf[1024];
	unsigned int bytes_sent, bytes_recv;
	/* Ist der Aufruf korrekt? */
	if (argc != 3) {
		fprintf (stderr, "Aufruf: httprecv host file\n");
		exit (EXIT_FAILURE);
	}
	host = argv[1];
	file  = argv[2];
	/* ggf. Winsock initialisieren */
	#ifdef _WIN32W
	SADATA wsaData;
	if (WSAStartup (MAKEWORD(1, 1), &wsaData) != 0) {
		fprintf (stderr, "WSAStartup(): Kann Winsock nicht initialisieren.\n");
		exit (EXIT_FAILURE);
	}
	#endif
	/* Socket erzeugen */
	sock = socket (AF_INET, SOCK_STREAM, 0);
	if (sock == -1) {
		perror ("socket()");
		exit (EXIT_FAILURE);
	}
	/* Adresse des Servers festlegen */
	memset( &host_addr, 0, sizeof (host_addr));
	host_addr.sin_family = AF_INET;
	host_addr.sin_port = htons (HTTP_PORT);
	host_addr.sin_addr.s_addr = inet_addr (host);
	if (host_addr.sin_addr.s_addr == INADDR_NONE) {
		/* Server wurde nicht mit IP sondern mit dem Namen angegeben */
		hostinfo = gethostbyname (host);
		if (hostinfo == NULL) {
			perror ("gethostbyname()");
			exit (EXIT_FAILURE);
		}
		memcpy((char*) &host_addr.sin_addr.s_addr, hostinfo->h_addr, hostinfo->h_length);
	}
	/* Verbindung aufbauen */
	if (connect(sock, (struct sockaddr *) &host_addr, sizeof(struct sockaddr)) == -1) {
		perror ("connect()");
		exit (EXIT_FAILURE);
	}
	/* HTTP-GET-Befehl erzeugen */
	sprintf (command, "GET %s HTTP/1.0\nHost: %s\n\n", file, host);
	/* Befehl senden */
	bytes_sent = send (sock, command, strlen (command), 0);
	if (bytes_sent == -1) {
		perror ("send()");
		exit (EXIT_FAILURE);
	}
	// Antwort des Servers empfangen und ausgeben */
	while ((bytes_recv = recv (sock, buf, sizeof(buf), 0)) > 0) {
		write (1, buf, bytes_recv);
	}
	if (bytes_recv == -1) {
		perror ("recv()");
		exit (EXIT_FAILURE);
	}printf ("\n");
	#ifdef _WIN32
	closesocket(sock);
	WSACleanup();
	#else
	close(sock);
	#endif
	return 0;
}

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sprintf (command, "GET %s HTTP/1.0\r\nHost: %s\r\n\r\n", file, host);