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asyn-thread: use c-ares to resolve HTTPS RR

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Allow building with c-ares and yet use threaded resolver for the main
host A/AAAA resolving:

  `--with-ares` provides the c-ares install path and defaults to use
  c-ares for name resolving

  `--with-threaded-resolver` still uses c-ares in the build (for HTTPS)
  but uses the threaded resolver for "normal" resolves.

It works similarly for cmake: ENABLE_ARES enables ares, and if
ENABLE_THREADED_RESOLVER also is set, c-ares is used for HTTPS RR and
the threaded resolver for "normal" resolves.

HTTPSRR and c-ares-rr are new features return by curl_version_info() and
thus shown by curl -V.

The c-ares-rr feature bit is there to make it possible to distinguish
between builds using c-ares for all name resolves and builds that use
the threaded resolves for the regular name resolves and c-ares for
HTTPSRR only. "c-ares-rr" means it does not use c-ares for "plain" name
resolves.

HTTPSRR support is EXPERIMENTAL only.

Closes #16054
This commit is contained in:
Daniel Stenberg 2025-01-21 11:42:20 +01:00
parent 520e67dd39
commit 0d4fdbf15d
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GPG key ID: 5CC908FDB71E12C2
18 changed files with 470 additions and 421 deletions
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10
lib/version.c
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@ -467,11 +467,18 @@ static const struct feat features_table[] = {
#ifdef HAVE_BROTLI
FEATURE("brotli", NULL, CURL_VERSION_BROTLI),
#endif
#if defined(CURLRES_ARES) && defined(CURLRES_THREADED)
FEATURE("c-ares-rr", NULL, 0),
#endif
#ifdef DEBUGBUILD
FEATURE("Debug", NULL, CURL_VERSION_DEBUG),
#endif
#if defined(USE_SSL) && defined(USE_ECH)
FEATURE("ECH", ech_present, 0),
#ifndef USE_HTTPSRR
#error "ECH enabled but not HTTPSRR, must be a config error"
#endif
#endif
#ifdef USE_GSASL
FEATURE("gsasl", NULL, CURL_VERSION_GSASL),
@ -492,6 +499,9 @@ static const struct feat features_table[] = {
!defined(CURL_DISABLE_HTTP)
FEATURE("HTTPS-proxy", https_proxy_present, CURL_VERSION_HTTPS_PROXY),
#endif
#if defined(USE_HTTPSRR)
FEATURE("HTTPSRR", NULL, 0),
#endif
#if defined(USE_LIBIDN2) || defined(USE_WIN32_IDN) || defined(USE_APPLE_IDN)
FEATURE("IDN", idn_present, CURL_VERSION_IDN),
#endif