c-ares: honor port numbers in CURLOPT_DNS_SERVERS

By using ares_set_servers_ports_csv on new enough c-ares.

Fixes #4066
Closes #4067

diff --git a/lib/asyn-ares.c b/lib/asyn-ares.c
index 8561a4724642f4d1ee753d1f82b9f8ba184257c2..6b14aa69815e4db34cf81924f797e45601c37a2b 100644 (file)
--- a/lib/asyn-ares.c
+++ b/lib/asyn-ares.c
@@ -734,7 +734,11 @@ CURLcode Curl_set_dns_servers(struct Curl_easy *data,
     return CURLE_OK;
 
 #if (ARES_VERSION >= 0x010704)
+#if (ARES_VERSION >= 0x010b00)
+  ares_result = ares_set_servers_ports_csv(data->state.resolver, servers);
+#else
   ares_result = ares_set_servers_csv(data->state.resolver, servers);
+#endif
   switch(ares_result) {
   case ARES_SUCCESS:
     result = CURLE_OK;