A C library for asynchronous DNS requests (grpc依赖)
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## c-ares version 1.32.2 - July 15 2024
This is a bugfix release.
Bugfixes:
* Windows: rework EventThread AFD code for better stability.
[PR #811](https://github.com/c-ares/c-ares/pull/811)
* Windows: If an IP address was detected to have changed, it could lead to a
crash due to a bad pointer. Regression introduced in 1.31.0.
[59e3a1f4](https://github.com/c-ares/c-ares/commit/59e3a1f4)
* Windows: use `QueryPerformanceCounters()` instead of `GetTickCount64()` for
better time accuracy (~15ms -> ~1us).
* Windows 32bit config change callback needs to be tagged as `stdcall` otherwise
could result in a crash.
[5c2bab35](https://github.com/c-ares/c-ares/commit/5c2bab35)
* Tests that need accurate timing should not depend on internal symbols as there
are C++ equivalents in `std::chrono`.
[PR #809](https://github.com/c-ares/c-ares/pull/809)
* Kqueue (MacOS, \*BSD): If the open socket count exceeded 8 (unlikely), it
would try to allocate a new buffer that was too small.
[5aad7981](https://github.com/c-ares/c-ares/commit/5aad7981)
## c-ares version 1.32.1 - July 7 2024
This is a bugfix release.
Bugfixes:
* Channel lock needs to be recursive to ensure calls into c-ares functions can
be made from callbacks otherwise deadlocks will occur. This regression was
introduced in 1.32.0.
## c-ares version 1.32.0 - July 4 2024
This is a feature and bugfix release.
Features:
* Add support for DNS 0x20 to help prevent cache poisoning attacks, enabled
by specifying `ARES_FLAG_DNS0x20`. Disabled by default. [PR #800](https://github.com/c-ares/c-ares/pull/800)
* Rework query timeout logic to automatically adjust timeouts based on network
conditions. The timeout specified now is only used as a hint until there
is enough history to calculate a more valid timeout. [PR #794](https://github.com/c-ares/c-ares/pull/794)
Changes:
* DNS RR TXT strings should not be automatically concatenated as there are use
cases outside of RFC 7208. In order to maintain ABI compliance, the ability
to retrieve TXT strings concatenated is retained as well as a new API to
retrieve the individual strings. This restores behavior from c-ares 1.20.0.
[PR #801](https://github.com/c-ares/c-ares/pull/801)
* Clean up header inclusion logic to make hacking on code easier. [PR #797](https://github.com/c-ares/c-ares/pull/797)
* GCC/Clang: Enable even more strict warnings to catch more coding flaws. [253bdee](https://github.com/c-ares/c-ares/commit/253bdee)
* MSVC: Enable `/W4` warning level. [PR #792](https://github.com/c-ares/c-ares/pull/792)
Bugfixes:
* Tests: Fix thread race condition in test cases for EventThread. [PR #803](https://github.com/c-ares/c-ares/pull/803)
* Windows: Fix building with UNICODE. [PR #802](https://github.com/c-ares/c-ares/pull/802)
* Thread Saftey: `ares_timeout()` was missing lock. [74a64e4](https://github.com/c-ares/c-ares/commit/74a64e4)
* Fix building with DJGPP (32bit protected mode DOS). [PR #789](https://github.com/c-ares/c-ares/pull/789)
Thanks go to these friendly people for their efforts and contributions for this
release:
* Brad House (@bradh352)
* Cheng (@zcbenz)