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cygwin_getaddrinfo: workaround Winsock getaddrinfo issue with broken DNS 

Add experimental code to workaround the issue described in the thread
starting at

  https://cygwin.com/ml/cygwin/2015-07/msg00350.html

There's a hint in https://communities.vmware.com/message/2577858#2577858
that this problem is related to using the AI_ALL flag.

This patch checks if GetAddrInfoW returned with WSANO_RECOVERY and if
the AI_ALL flag was set, it retries GetAddrInfo without the AI_ALL flag.

	* net.cc (cygwin_getaddrinfo): Add experimental code to retry
	GetAddrInfoW without AI_ALL flag if it returned with WSANO_RECOVERY.

Signed-off-by: Corinna Vinschen <corinna@vinschen.de>
This commit is contained in:
Corinna Vinschen 2016-03-14 17:57:22 +01:00
parent f75114fc59
commit 7176a85cd4
1 changed files with 10 additions and 1 deletions
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11
winsup/cygwin/net.cc
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@ -3595,7 +3595,16 @@ cygwin_getaddrinfo (const char *hostname, const char *servname,
}
/* Disable automatic IDN conversion on W8 and later. */
whints.ai_flags |= AI_DISABLE_IDN_ENCODING;
ret = w32_to_gai_err (GetAddrInfoW (whost, wserv, &whints, &wres));
ret = GetAddrInfoW (whost, wserv, &whints, &wres);
/* Try to workaround an apparent shortcoming in Winsock's getaddrinfo
implementation. See this link for details:
https://communities.vmware.com/message/2577858#2577858 */
if (ret == WSANO_RECOVERY && (whints.ai_flags & AI_ALL))
{
whints.ai_flags &= ~AI_ALL;
ret = GetAddrInfoW (whost, wserv, &whints, &wres);
}
ret = w32_to_gai_err (ret);
/* Always copy over to self-allocated memory. */
if (!ret)
{