c-ares

A C library for asynchronous DNS requests (grpc依赖)

c-ares version 1.32.3 - July 24 2024

This is a bugfix release.

Changes:

Prevent complex recursion during query requeuing and connection cleanup for stability. e8b32b8
Better propagate error codes on requeue situations. a9bc0a2
Try to prevent SIGPIPE from being generated and delivered to integrations. de01baa

Bugfixes:

Missing manpage for ares_dns_record_set_id() aa462b3
Memory leak in ares__hosts_entry_to_hostent() due to allocation strategy. PR #824
UDP write failure detected via ICMP unreachable should trigger faster failover. PR #821
Fix pycares test case regression due to wrong error code being returned. Regression from 1.31.0. PR #820
Fix possible Windows crash during ares_destroy() when using event threads. 5609bd4
ARES_OPT_MAXTIMEOUTMS wasn't being honored in all cases. a649c60

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

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.

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:

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