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CURLOPT_DNS_SERVERS(3)              libcurl             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 * 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, "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);
       }


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),

ibcurl 8.1.2                    April 26, 2023          CURLOPT_DNS_SERVERS(3)

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