Based on Maxim Perenesenko's patch, we now do SOCKS5 operations and let the

proxy do the host name resolving and only if --socks5ip (or
CURLOPT_SOCKS5_RESOLVE_LOCAL) is used we resolve the host name locally and
pass on the IP address only to the proxy.

lib/url.c

@@ -2054,6 +2054,14 @@ CURLcode Curl_setopt(struct SessionHandle *data, CURLoption option,
     }
     break;
 
+  case CURLOPT_SOCKS5_RESOLVE_LOCAL:
+    /*
+     * Enable or disable using of SOCKS5 proxy server to resolve domain names
+     * instead of using platform API like gethostbyname_r etc
+     */
+    data->set.socks5_resolve_local = (bool)(0 != va_arg(param, long));
+    break;
+
   default:
     /* unknown tag and its companion, just ignore: */
     result = CURLE_FAILED_INIT; /* correct this */