[ainozama@notebook sandbox]$ cat ipv6util_storage.c
#include <sys/types.h>
#include <sys/socket.h>
#include <netdb.h>
#include <string.h>
#include <stdlib.h>
#include <stdio.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <arpa/inet.h>
#include <bits/socket.h>
#include <errno.h>
 #include <unistd.h>

static int cached_getipbyname(char *host_name, struct sockaddr_storage *endereco) {
	struct addrinfo *res;
	getaddrinfo(host_name, "80", NULL, &res);
	memcpy(endereco, res->ai_addr, res->ai_addrlen);
	return(0);
}

int main(int argc, char *argv[]){
	struct sockaddr_storage endereco;
	char *t = NULL;

	cached_getipbyname(argv[1], &endereco);
	if (endereco.ss_family == AF_INET6) {
			int fd;
			struct sockaddr_in6 *addr;

			//memset(&addr,0,sizeof(addr));
			addr = (struct sockaddr_in6 *)&endereco;
			t = malloc (INET6_ADDRSTRLEN);
			inet_ntop(AF_INET6, &addr->sin6_addr, t, INET6_ADDRSTRLEN);
			printf("DEST IP: %s\n", t);
			printf("PORT: %d\n", addr->sin6_port);

			fd = socket(AF_INET6, SOCK_STREAM, 0);
			if (connect(fd, (struct sockaddr *)&addr, sizeof(addr->sin6_addr)) == -1) {
				printf("NOK\n");
				if(errno != EINPROGRESS) {
					printf("connect error: %s\n",strerror(errno));
					close(fd);
				}
			} else
				printf("OK\n");
			free(t);
	}
	return(0);
}

[ainozama@notebook sandbox]$ make storage
gcc -g -Wall ipv6util_storage.c -o ipv6util_storage

[ainozama@notebook sandbox]$ ./ipv6util_storage ipv6lab
DEST IP: fef::6f:ec:b5
PORT: 20480
NOK
connect error: Invalid argument