Lennart Poettering
2471a977b1
This reworks how we reply to D-Bus messages that come in for resolution requests. Previously, we'd store them in the .bus_request field of the main DnsQuery (but not any auxiliary one), and reply to it whenever we had something to reply. In error paths this could mean we'd accidentally reply twice. This cleans this logic up: whenever we reply to a message we'll now go up the tree of auxiliary queries, to find the primary query, i.e. the one we actually want to reply to. Once we found it, we take out the bus message object, resetting it to NULL. This way we can be sure we'll reply at most once to each message. Fixes: #22477
System and Service Manager
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