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easy: Fix curl_easy_duphandle for builds missing IPv6 that use c-ares

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- Ignore CURLE_NOT_BUILT_IN errors returned by c-ares functions in
  curl_easy_duphandle.

Prior to this change if c-ares was used as the resolver backend and
either it was too old or libcurl was built without IPv6 support then
some of our resolver functions could return CURLE_NOT_BUILT_IN to
curl_easy_duphandle causing it to fail.

Caused by c8f086b which shipped in 7.69.1.

Reported-by: Karl Chen

Fixes https://github.com/curl/curl/issues/5097
Closes https://github.com/curl/curl/pull/5100
This commit is contained in:
Jay Satiro 2020-03-14 02:19:04 -04:00
parent 0845ecbb6d
commit 3bfda07004
1 changed files with 19 additions and 8 deletions
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27
lib/easy.c
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@ -884,14 +884,25 @@ struct Curl_easy *curl_easy_duphandle(struct Curl_easy *data)
goto fail;
#ifdef USE_ARES
if(Curl_set_dns_servers(outcurl, data->set.str[STRING_DNS_SERVERS]))
goto fail;
if(Curl_set_dns_interface(outcurl, data->set.str[STRING_DNS_INTERFACE]))
goto fail;
if(Curl_set_dns_local_ip4(outcurl, data->set.str[STRING_DNS_LOCAL_IP4]))
goto fail;
if(Curl_set_dns_local_ip6(outcurl, data->set.str[STRING_DNS_LOCAL_IP6]))
goto fail;
{
CURLcode rc;
rc = Curl_set_dns_servers(outcurl, data->set.str[STRING_DNS_SERVERS]);
if(rc && rc != CURLE_NOT_BUILT_IN)
goto fail;
rc = Curl_set_dns_interface(outcurl, data->set.str[STRING_DNS_INTERFACE]);
if(rc && rc != CURLE_NOT_BUILT_IN)
goto fail;
rc = Curl_set_dns_local_ip4(outcurl, data->set.str[STRING_DNS_LOCAL_IP4]);
if(rc && rc != CURLE_NOT_BUILT_IN)
goto fail;
rc = Curl_set_dns_local_ip6(outcurl, data->set.str[STRING_DNS_LOCAL_IP6]);
if(rc && rc != CURLE_NOT_BUILT_IN)
goto fail;
}
#endif /* USE_ARES */
Curl_convert_setup(outcurl);