This is why it's a good idea to use getaddrinfo and getnameinfo for IP address validation and normalization. While we're at it, use sockaddr's to represent addr

This is why it's a good idea to use getaddrinfo and getnameinfo for IP address validation and normalization. While we're at it, use sockaddr's to represent addresses. in6_addr doesn't hold the IPv6 address scope/zone ID.