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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.

       Using this option multiple times makes the last set string override the
       previous ones. Set it to NULL to disable its use again.


DEFAULT

       NULL


PROTOCOLS

       This functionality affects all supported protocols


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);
         }
       }


NOTES

       This option requires that libcurl was built with a resolver backend
       that supports this operation. The c-ares backend is the only such one.


AVAILABILITY

       Added in curl 7.24.0


RETURN VALUE

       curl_easy_setopt(3) returns a CURLcode indicating success or error.

       CURLE_OK (0) means everything was OK, non-zero means an error occurred,
       see libcurl-errors(3).


SEE ALSO

       CURLOPT_DNS_CACHE_TIMEOUT(3), CURLOPT_DNS_LOCAL_IP4(3),
       CURLOPT_DNS_LOCAL_IP6(3)

libcurl                           2025-02-08            CURLOPT_DNS_SERVERS(3)

curl 8.12.0 - Generated Fri Feb 14 14:58:57 CST 2025
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