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A C library for asynchronous DNS requests (grpc依赖)
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c-ares/RELEASE-NOTES.md

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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
  • 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
  • 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
  • Tests that need accurate timing should not depend on internal symbols as there are C++ equivalents in std::chrono. PR #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

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
  • 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

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
  • Clean up header inclusion logic to make hacking on code easier. PR #797
  • GCC/Clang: Enable even more strict warnings to catch more coding flaws. 253bdee
  • MSVC: Enable /W4 warning level. PR #792

Bugfixes:

  • Tests: Fix thread race condition in test cases for EventThread. PR #803
  • Windows: Fix building with UNICODE. PR #802
  • Thread Saftey: ares_timeout() was missing lock. 74a64e4
  • Fix building with DJGPP (32bit protected mode DOS). PR #789

Thanks go to these friendly people for their efforts and contributions for this release: