#include <arpa/inet.h>
#include <netinet/in.h>
#include <stdio.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <unistd.h>
#include <string.h>
#include <stdlib.h>
#define BUFLEN 512
#define NPACK 10
#define PORT 1337
#define OPSTRING "p:s:g:o:"
#define DEBUG 0 




void diep(char *s)
{
	perror(s);
	exit(1);
}

int main(void)
{
	struct sockaddr_in si_me, si_other;
	int s, i, slen=sizeof(si_other);
	
	char buf[BUFLEN];

	if ((s=socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP))==-1)
		diep("socket");
	
	memset((char *) &si_me, 0, sizeof(si_me));
	si_me.sin_family = AF_INET;
	si_me.sin_port = htons(PORT);
	si_me.sin_addr.s_addr = htonl(INADDR_ANY);
	if (bind(s, &si_me, sizeof(si_me))==-1)
		diep("bind");
	
	for (i=0; i<NPACK; i++) {
		if (recvfrom(s, buf, BUFLEN, 0, &si_other, &slen)==-1)
			diep("recvfrom()");
		printf("Received packet from %s:%d\nData: %s\n\n", 
				inet_ntoa(si_other.sin_addr), 
				ntohs(si_other.sin_port), buf);
	}
	
	close(s);
	return 0;
}