/* Example of connection to test if internet enabled :-)
 * If the internet isn't on you're in real trouble!
 *
 * Compile using
 *
 * gcc -Wall -Wshadow -g -O0 -lbind -lsocket connect_test.c -o connect_test
 *
 * Enjoy!
 */


#include <sys/types.h>
#include <stdio.h>
#include <netinet/in.h>
#include <sys/socket.h>
#include <unistd.h>

int main(int argc, char *argv[])
{
	int sock = -1;
	int ck = 0;
	struct sockaddr_in sa;
	
	/* The struct sockaddr_in is the ipv4 version of the generic
	 * sockaddr structure. We set it up here to point at port 80
	 * of a www.google.com ip address (216.239.59.104).
	 * Once setup we then use it later in our connect call.
	 * NB the port number must be tranformed into NETWORK ORDER using
	 *    htons (for a short) and the ip address (using htonl as it's
	 *    a 32-bit value - long).
	 */
	memset(&sa, 0, sizeof(sa));
	sa.sin_family = AF_INET;
	sa.sin_port = htons(80);
	sa.sin_addr.s_addr = htonl(0xd8ef3b68);
	
	/* Try to open a socket */
	sock = socket(AF_INET, SOCK_STREAM, 0);
	if (sock < 0) {
		printf("Doh! no socket!\n");
		exit(-1);
	}

	/* Now try to connect. We don't need to talk, just connect. */
	ck = connect(sock, (struct sockaddr *)&sa, sizeof(sa));
	if (ck != 0)
		printf("Unable to connect to the http server on 216.239.59.104 [www.google.com]\n");
	else
		printf("Guess the internet is on at the moment\n");
	
	/* Close our socket, just to be tidy */
	close(sock);
	
	/* Return that we're all done... */
	return 0;
}