On Tue, 15 Apr 2025 08:58:21 GMT, Jaikiran Pai <j...@openjdk.org> wrote:

> Can I please get a review of this change which proposes to address the issue 
> noted in https://bugs.openjdk.org/browse/JDK-8354576?
> 
> As noted in that issue, the current code in the `lookupAllHostAddr()` 
> function of `Inet4AddressImpl.c` and `Inet6AddressImpl.c` has a macos 
> specific implementation, where we call `getifaddrs()` and iterate over the 
> returned addresses. In its current form this code doesn't check to see if the 
> interface is UP or not. This can result in returing an address belonging to 
> an interface which is not UP. That can cause subsequent usage of the address 
> for networking operations to result in a "Network is down" error.
> 
> The commit in this PR skips interfaces that are not UP. The change only 
> impacts the result of `getLocalHost()` call and that too only on macos. Given 
> the nature of this change no new regression test has been introduced. 
> Existing tests in tier1, tier2 and tier3 continue to pass with this change.

@jaikiran, maybe asking the obvious but... We don't need this `IFF_UP` check 
for the below methods in `NetworkInterface.c`, right?

- `enumIPv4Interfaces`
- `enumIPv6Interfaces`
- `getMacAddress`

-------------

Marked as reviewed by vyazici (Author).

PR Review: https://git.openjdk.org/jdk/pull/24653#pullrequestreview-2769434020

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