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CURLOPT_DNS_SERVERS - set preferred DNS servers #include <curl/curl.h> CURLcode curl_easy_setopt(CURL *handle, CURLOPT_DNS_SERVERS, char *servers); Pass a char * that is the list of DNS servers to be used instead of the system default. The format of the dns servers option is: host[:port][,host[:port]]... For example: 192.168.1.100,192.168.1.101,3.4.5.6 The application does not have to keep the string around after setting this option. NULL - use system default All

CURL *curl = curl_easy_init();
if(curl) {
 curl_easy_setopt(curl, CURLOPT_URL, "https://example.com/foo.bin");
 curl_easy_setopt(curl, CURLOPT_DNS_SERVERS, "192.168.1.100:53,192.168.1.101");
 ret = curl_easy_perform(curl);
 curl_easy_cleanup(curl);
}

This option requires that libcurl was built with a resolver backend that supports this operation. The c-ares backend is the only such one. Added in 7.24.0 Returns CURLE_OK if the option is supported, CURLE_UNKNOWN_OPTION if not, CURLE_NOT_BUILT_IN if support was disabled at compile-time, CURLE_BAD_FUNCTION_ARGUMENT when given an invalid server list, or CURLE_OUT_OF_MEMORY if there was insufficient heap space. CURLOPT_DNS_LOCAL_IP4 "(3), " CURLOPT_DNS_CACHE_TIMEOUT "(3), "