dnsd now opens UDP+TCP sockets and accepts http: DoH requests to obtain
the same, configured answers (records, delays, error codes) as over UDP.
DoH: use `async->queries_ongoing` like all other resolvers instead of
the internal `pending` counter. Fixes waiting for results.
Tests: in pytest, parameterize dnsd tests to use both DNS and DoH.
Closes#22506
* remove an unneeded ruff warning disable
* remove coding: utf-8 from Python code; PEP 3120 makes UTF-8 the
default encoding
* remove unusable shebang lines from Python code
* remove empty print strings
* disable warnings when file objects are stored; these instances can't
be handled with context managers
* use more consistent whitespace in Python code, fixing flake8 warnings
* set the executable bit on scorecard.py, making it easier to run
These fix ruff rules EXE001, FURB105, UP009, SIM115.
Use separate dns cache entries for addresses (A+AAAA) and HTTPS-RR
results. That makes also "negative" results independent of each other.
Dns cache entries, once in use, can no longer be modified safely, as
concurrent use would require each access then to be done under lock. By
using separate entries, we can update a HTTPS entry without needing to
duplicate an existing address entry for the same host+port.
Connection filters can now ask for DNS resolves. This works at any time
during connection setup and while connect is going on.
`Curl_conn_dns_add_addr_resolve()` and
`Curl_conn_dns_add_https_resolve()` are used for that. They check if the
resolve is already ongoing, can be added to a resolve not started yet
or, as last resort, create a new filter instance and add it to the
connection (it's easier to add more filters than making the same filter
handle multiple resolves. Since DNS filters are removed once the
connection is established, there is no later penalty).
HTTPS-RR queries are added by the `HTTPS-CONNECT`, `SSL` and `QUIC`
filters. The latter will only do that when ECH is configured and
supported. That means we trigger HTTPS-RR queries only when the results
matter.
Add test_22_06 for ALPN influenced via HTTPS-RR when tunneling through a
proxy. This did not work before.
Adjust test2100 to use https: as the previous http: URL no longer
triggers HTTPS-RR resolves.
Closes#22216
Support HTTPS records in dnsd that have ALPN preferences.
Add pytest test_22_* to verify that HTTPS record ALPN
preferencces take effect if the HTTPS resolve arrives in time.
Fix HTTPS eyeballing use of timeouts for second attempt. Also,
make an initial HTTP/1.1 attempt switch off HTTP/2.
Closes#21329
