Provided by: libcurl4-doc_7.55.1-1ubuntu2_all bug

NAME

       CURLOPT_DNS_SERVERS - set preferred DNS servers

SYNOPSIS

       #include <curl/curl.h>

       CURLcode curl_easy_setopt(CURL *handle, CURLOPT_DNS_SERVERS, char *servers);

DESCRIPTION

       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.

DEFAULT

       NULL - use system default

PROTOCOLS

       All

EXAMPLE

       CURL *curl = curl_easy_init();
       if(curl) {
         curl_easy_setopt(curl, CURLOPT_URL, "http://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);
       }

AVAILABILITY

       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

RETURN VALUE

       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.

SEE ALSO

       CURLOPT_DNS_LOCAL_IP4(3), CURLOPT_DNS_CACHE_TIMEOUT(3),