[curl/curl] 84d283: CURLOPT_IPRESOLVE: preventing wrong IP version fro...

  Branch: refs/heads/master
  Home:   https://github.com/curl/curl
  Commit: 84d2839740ca78041ac7419d9aaeac55c1e1c729
      https://github.com/curl/curl/commit/84d2839740ca78041ac7419d9aaeac55c1e1c729
  Author: Lucas Clemente Vella <[email protected]>
  Date:   2021-05-20 (Thu, 20 May 2021)

  Changed paths:
    M docs/libcurl/curl_easy_setopt.3
    M docs/libcurl/opts/CURLOPT_IPRESOLVE.3
    M docs/libcurl/opts/CURLOPT_RESOLVE.3
    M include/curl/curl.h
    M lib/asyn-ares.c
    M lib/asyn-thread.c
    M lib/connect.c
    M lib/doh.c
    M lib/hostip6.c
    M lib/url.c
    M tests/data/test1082

  Log Message:
  -----------
  CURLOPT_IPRESOLVE: preventing wrong IP version from being used

In some situations, it was possible that a transfer was setup to
use an specific IP version, but due do DNS caching or connection
reuse, it ended up using a different IP version from requested.

This commit changes the effect of CURLOPT_IPRESOLVE from simply
restricting address resolution to preventing the wrong connection
type being used, when choosing a connection from the pool, and
to restricting what addresses could be used when establishing
a new connection.

It is important that all addresses versions are resolved, even if
not used in that transfer in particular, because the result is
cached, and could be useful for a different transfer with a
different CURLOPT_IPRESOLVE setting.

Closes #6853


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