#include <assert.h>
#include <netdb.h>
#include <stdio.h>
#include <strings.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <sys/types.h>
#include <sys/socket.h>

int
main(void)
{
	int fd, portno, r;
	ssize_t rcv_bytes;
	struct hostent *he;
	struct sockaddr_in server_addr;

	fd = socket(AF_INET, SOCK_DGRAM, 0);
	assert(fd != -1);

	bzero((char *)&server_addr, sizeof(server_addr));
	portno = 9876;
	server_addr.sin_family = AF_INET;
	server_addr.sin_addr.s_addr = INADDR_ANY;
	server_addr.sin_port = htons(portno);
	r = bind(fd, (struct sockaddr *)&server_addr, sizeof(server_addr));
	assert (r == 0);
	for (;;) {
		char buf[25];
		struct sockaddr_in src_addr;
		socklen_t len;
		rcv_bytes = recvfrom(fd, &buf, sizeof(buf), 0,
		    (struct sockaddr *)&src_addr, &len);
		printf("%s\n", buf);
	}
	return (0);
}