Issue #19144 has been updated by kjtsanaktsidis (KJ Tsanaktsidis). Thank you for having a look at this!

Ruby has several methods to invoke getaddrinfo() and connect() internally, such as TCPSocket.new. How about we specify AI_ADDRCONFIG for getaddrinfo invocations in such methods?

I'm OK with doing just this, and not changing direct calls to `Addrinfo.getaddrinfo`. You're right, it's going to solve 99% of the problems and avoids any potential compatibility issue

I don't understand why AI_V4MAPPED is useful. I did a bit more research into this. Actually what I said in the original issue about NAT64 is wrong, v4 mapped v6 addresses have nothing to do with NAT64.

What this flag does _actually_ is: * When making a call to getaddrinfo with both AF_INET6 and AI_V4MAPPED, * If there is no AAAA record for a name, * And there is an A record for a name, * Return an "IPv4-mapped IPv6 address", which is an IPv6 address prefixed with `::FFFF` and then the four bytes of the IPv4 address at the end e.g. `::FFFF:1.2.3.4` The point of the IPv4-mapped IPv6 address actually has nothing to do with NAT64. Rather, when calling `connect(2)` on such an IPv6 address, _if_ the host actually does have an IPv4 address as well, it will make the connection with the IPv4 stack. The purpose of this, it seems, is to allow applications to be written to only handle IPv6, and they'll transparently get IPv4 support for free. I don't think Ruby actually needs this flag - it defaults to making the request with `AF_UNSPEC` and can handle getting either IPv4 or IPv6 addresses out of `getaddrinfo` correctly. In fact, the only way for any of the socket connect methods to pass a specific address family in here is `UDPSocket.new(Socket::AF_INET6).connect('hostname', port_number)`. If this actually made an IPv4 connection because getaddrinfo returned an IPv4-mapped IPv6 address, I think that would be very confusing. So, I think you're right - we should not set `AI_V4MAPPED` by default.

Also, some systems, such as NetBSD, seems doesn't have AI_V4MAPPED.

I would add feature checks for these flags in socket's `extconf.rb` i think. ---------------------------- Thanks again for your feedback. I'll try and send a PR later this week which defaults `AI_ADDRCONFIG` to on when `getaddrinfo` is called from inside the socket connection methods (but NOT when called explicitly with `Socket.getaddrinfo` et al). ---------------------------------------- Bug #19144: Ruby should set AI_V4MAPPED | AI_ADDRCONFIG getaddrinfo flags by default https://bugs.ruby-lang.org/issues/19144#change-101648 * Author: kjtsanaktsidis (KJ Tsanaktsidis) * Status: Feedback * Priority: Normal * Backport: 2.7: UNKNOWN, 3.0: UNKNOWN, 3.1: UNKNOWN ---------------------------------------- Currently, DNS lookups made with `getaddrinfo` from Ruby (i.e. not from the `Resolv` module) cause both A and AAAA DNS requests to be made, even on systems that don’t actually have an IPv6 address that could possibly make the AAAA response useful. I wouldn’t _really_ care about this, normally, but glibc has a bug (https://bugs.launchpad.net/ubuntu/+source/glibc/+bug/1961697) which can cause a 5-second delay in DNS lookups when both A and AAAA records are queried in parallel. This bug is fixed in glibc upstream but still present in some LTS linux distros (Ubuntu 18.04 and 20.04 at least), so I think it’s worthwhile to try and work around it in circumstances where the AAAA request is pointless anyway. The dual A/AAAA lookup happens because whenever Ruby calls getaddrinfo to perform DNS lookups, it always sets `hints`, and sets `hints->ai_flags` to zero by default unless flags are specified by the caller (e.g. `AI_PASSIVE` is set when binding a TCP server socket in `TCPServer.new`). This matches the default value of `ai_flags` specified by POSIX, which is zero. However, glibc behaves differently. When glibc’s `getaddrinfo` function is called with `NULL` for the `hints` parameter, it defaults the `ai_flags` value to `(AI_V4MAPPED | AI_ADDRCONFIG)`. The manpage (from the Linux man-pages project - https://man7.org/linux/man-pages/man3/getaddrinfo.3.html) claims “this is an improvement on the standard” (although I couldn’t find this mentioned in the glibc manual itself). Of course, we’re not _actually_ ever calling `getaddrinfo` with NULL `hints`; so, we never actually use these flags on glibc systems (unless they’re explicitly specified by the caller). My proposal is that we should change Ruby to set these two flags by default, when they’re available, in the following circumstances: * In all calls made internally to `rsock_getaddrinfo` as a result of socket functions like `TCPSocket.new`, `UDPSocket.new`, etc. * EXCEPT when `AI_PASSIVE` is also set (i.e. when we’re trying to get an address to bind for listener socket - see below) * In calls made to `rsock_getaddrinfo` as a direct result of calling `Addrinfo.getaddrinfo` from Ruby with nil flags * EXCEPT calls to `Addrinfo.getaddrinfo` where explicit flags are provided Both of these seem like something you would almost always want to be doing in any outgoing connection scenario: * `AI_V4MAPPED` ensures that, if AF_INET6 is explicitly specified as the desired protocol, and there is no AAAA record in DNS, that any A record that _is_ present gets converted to an IPv4-mapped IPv6 address so it can be used e.g. with NAT64. * `AI_ADDRCONFIG` ensures that, if a machine has no IPv6 address, it doesn’t bother making an AAAA lookup that will return IPv6 addresses that can’t actually be used for anything (and vice versa for IPv4). The reason why we wouldn’t want to set `AI_ADDRCONFIG` in circumstances where Ruby currently sets `AI_PASSIVE` is that loopback addresses are not considered in deciding if a system has an IPv4/IPv6 address. Conceivably, you might want to bind to a `::1` loopback address, and allow other processes on the same machine to connect to that. Does changing this default sound reasonable? If so I can prepare a patch. Another option I considered is doing this _only_ when Ruby is built against glibc (so that other system behaviour is most closely matched). -- https://bugs.ruby-lang.org/