tree 30c684f9f2ee08e96d98c13b041bf427c633de21
parent bfce4be5569c60687509a40c4f2304f2962182cb
author Lorenzo Colitti <lorenzo@google.com> 1586971581 +0000
committer Lorenzo Colitti <lorenzo@google.com> 1587001236 +0000

Don't enumerate interfaces if no interfaces were found.

When dnsmasq receives a list of interfaces, but cannot find any
of them (e.g., because they have all been deleted), it enters the
default non-Android codepath where it listens on all interfaces.

Then, if any of the interfaces on the system is deleted while it
is starting up on all interfaces, it can enter a codepath where
it gets stuck for 20(!) seconds for DAD to complete on an
interface that no longer exists.

Bug: 152695206
Test: new test coverage in netd_integration_test
Merged-In: Id9289e5a22dddceb53782d75e3caa4f6a88c6fb1
Change-Id: Id9289e5a22dddceb53782d75e3caa4f6a88c6fb1