getaddrinfo in iOS 10 disregards AI_ADDRCONFIG hint, breaking IPv6 compatibility
| Originator: | randy | ||
| Number: | rdar://28378416 | Date Originated: | 9/19/2016 |
| Status: | Open | Resolved: | |
| Product: | iOS | Product Version: | 10.0.1 |
| Classification: | Serious Bug | Reproducible: | Always |
Area: Something not on this list Summary: Calling getaddrinfo with a hint of AI_ADDRCONFIG returns both IPv4 and IPv6 addresses when the only valid address on the system is an IPv6 address. This causes IPv4 addresses to be vended which are non-reachable. Steps to Reproduce: - Enable NAT64/DNS64 shared internet connection on a hard wired Mac - Connect to this access point with a device running iOS 10 - Call getaddrinfo passing hints of at least AI_ADDRCONFIG Expected Results: - Receive only results that represent routable addresses, in this case IPv6 only. Actual Results: - Receive results including IPv4 addresses Version: iOS 10.0.1 (14A403) Notes: Configuration: iPhone 6S+
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Just a quick note, we are seeing this in macOS Sierra 10.12 (16A319) as well, El Cap omitted the IPv4 results when running with no non-link local IPv4 addresses but Sierra returns them.