a019470312
Fixes #22575, as suggested by poettering in #35514. Intended as a workaround for some buggy routers, which refuse to send empty replies. If systemd-resolved starts two DnsTransactions, one for A and one for AAAA, and the domain in question has no AAAA entry, then the server will send a reply for A and no reply for AAAA. Correct behavior for the server would be to send an empty reply for AAAA. systemd-resolved would previously keep retrying the AAAA transaction, and eventually timeout the whole query, returning an error to the caller. Now, if the server replies to one query and not another, we cut short the timeout and return the partial result. Returning the partial result allows the rest of the system to keep working. It matches how e.g. glibc libnss_dns behaves. (cherry picked from commit 0da73fab56506ff1e4f8e59c167d27961f0fbf33) (cherry picked from commit 1748265915e09120d75766baaa4516b2779140eb) (cherry picked from commit e65fd8eb4b559ba621e2bd802894105ac1d575da) (cherry picked from commit 3761ffa0c925c3183337df95a4c19ba7f96bfde1) (cherry picked from commit 615ab029f47f77d6506c02597cbaf53ececc6451)
System and Service Manager
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