Re: IPv6-capable hostname lookup in ext/standard

Hi David, Le ven. 13 nov. 2026 à 18:46, David CARLIER <devnexen@gmail.com> a écrit : > Hi ! > > GH-25446 asks for a way to resolve a hostname to IPv6 addresses. > ext/standard cannot do that through the system resolver today: > > - gethostbyname() and gethostbynamel() are IPv4-only by documentation. > Changing their return values would break callers expecting a dotted quad. > - dns_get_record($host, DNS_AAAA) queries DNS directly and skips > /etc/hosts/nsswitch, so localhost and hosts-file entries do not resolve. > - socket_addrinfo_lookup() does it right but needs ext/sockets, and you > have to unpack its AddressInfo objects with socket_addrinfo_explain(). > > I'd like to add a new function for master, something like: > > function gethostaddresses(string $hostname, int $family = DNS_A | > DNS_AAAA): array|false {} > > It returns the address strings in getaddrinfo() order, or false on > failure. It goes through the system resolver like stream connections do. > $family reuses DNS_A/DNS_AAAA, since the AF_* constants live in > ext/sockets. php_network_getaddresses() already wraps getaddrinfo(), so the > change is small and fits with the resolver cleanup in GH-15555. > > Kind of open questions: > > 1. Naming: a new function, or a new parameter on gethostbynamel()? > 2. Should $family take the DNS_* constants, or should ext/standard get its > own constants? > > Unless there are objections, I'll open a PR in the coming days. > > Cheers. > Great idea. A few questions: - do you plan to return an empty array when there is no failure but no matching record, or false ? - why only A and AAAA? Other records are useful too, especially SVC - do you think you may wrap the syscall with a timeout somehow ? I’m not sure it’s possible due to how the kernel handles it but it would be great - may you add the ip of the dns server to reach ? With all that, the dns resolution would be much more useful on php. Thanks, Xavier >