noble (3) CURLOPT_DNS_SERVERS.3.gz

NAME

       CURLOPT_DNS_SERVERS - DNS servers to use

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

       int main(void)
       {
         CURL *curl = curl_easy_init();
         if(curl) {
           CURLcode res;
           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");
           res = 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_CACHE_TIMEOUT(3), CURLOPT_DNS_LOCAL_IP4(3), CURLOPT_DNS_LOCAL_IP6(3)