c-ares

A C library for asynchronous DNS requests (grpc依赖)

Brad House dd93f30082 Configuration option to limit number of UDP queries per ephemeral port (#549 ) Add a new ARES_OPT_UDP_MAX_QUERIES option with udp_max_queries parameter that can be passed to ares_init_options(). This value defaults to 0 (unlimited) to maintain existing compatibility, any positive number will cause new UDP ephemeral ports to be created once the threshold is reached, we'll call these 'connections' even though its technically wrong for UDP. Implementation Details: * Each server entry in a channel now has a linked-list of connections/ports for udp and tcp. The first connection in the list is the one most likely to be eligible to accept new queries. * Queries are now tracked by connection rather than by server. * Every time a query is detached from a connection, the connection that it was attached to will be checked to see if it needs to be cleaned up. * Insertion, lookup, and searching for connections has been implemented as O(1) complexity so the number of connections will not impact performance. * Remove is_broken from the server, it appears it would be set and immediately unset, so must have been invalidated via a prior patch. A future patch should probably track consecutive server errors and de-prioritize such servers. The code right now will always try servers in the order of configuration, so a bad server in the list will always be tried and may rely on timeout logic to try the next. * Various other cleanups to remove code duplication and for clarification. Fixes Bug: #444 Fix By: Brad House (@bradh352)		1 year ago
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CMakeLists.txt	provide SPDX identifiers and a REUSE CI job to verify	1 year ago
Makefile.am	provide SPDX identifiers and a REUSE CI job to verify	1 year ago
ares.h	Configuration option to limit number of UDP queries per ephemeral port (#549 )	1 year ago
ares_build.h.cmake	provide SPDX identifiers and a REUSE CI job to verify	1 year ago
ares_build.h.dist	provide SPDX identifiers and a REUSE CI job to verify	1 year ago
ares_build.h.in	provide SPDX identifiers and a REUSE CI job to verify	1 year ago
ares_dns.h	provide SPDX identifiers and a REUSE CI job to verify	1 year ago
ares_nameser.h	provide SPDX identifiers and a REUSE CI job to verify	1 year ago
ares_rules.h	provide SPDX identifiers and a REUSE CI job to verify	1 year ago
ares_version.h	provide SPDX identifiers and a REUSE CI job to verify	1 year ago