CURLOPT_DNS_SERVERS(3)     Library Functions Manual     CURLOPT_DNS_SERVERS(3)

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 pointer 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)

libcurl                          April 02 2024          CURLOPT_DNS_SERVERS(3)