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CURLOPT_DNS_SHUFFLE_ADDRESSES(3)    libcurl   CURLOPT_DNS_SHUFFLE_ADDRESSES(3)




NAME

       CURLOPT_DNS_SHUFFLE_ADDRESSES - shuffle IP addresses for hostname


SYNOPSIS

       #include <curl/curl.h>

       CURLcode curl_easy_setopt(CURL *handle, CURLOPT_DNS_SHUFFLE_ADDRESSES, long onoff);


DESCRIPTION

       Pass a long set to 1 to enable this option.

       When a name is resolved and more than one IP address is returned, this
       function shuffles the order of all returned addresses so that they are
       used in a random order. This is similar to the ordering behavior of the
       legacy gethostbyname function which is no longer used on most
       platforms.

       Addresses are not reshuffled if name resolution is completed using the
       DNS cache. CURLOPT_DNS_CACHE_TIMEOUT(3) can be used together with this
       option to reduce DNS cache timeout or disable caching entirely if
       frequent reshuffling is needed.

       Since the addresses returned are randomly reordered, the order is not
       in accordance with RFC 3484 or any other deterministic order that may
       be generated by the system's name resolution implementation. This may
       have performance impacts and may cause IPv4 to be used before IPv6 or
       vice versa.


DEFAULT

       0 (disabled)


PROTOCOLS

       All


EXAMPLE

       int main(void)
       {
         CURL *curl = curl_easy_init();
         if(curl) {
           curl_easy_setopt(curl, CURLOPT_URL, "https://example.com");
           curl_easy_setopt(curl, CURLOPT_DNS_SHUFFLE_ADDRESSES, 1L);

           curl_easy_perform(curl);

           /* always cleanup */
           curl_easy_cleanup(curl);
         }
       }


AVAILABILITY

       Added in 7.60.0


RETURN VALUE

       CURLE_OK or an error such as CURLE_UNKNOWN_OPTION.


SEE ALSO

       CURLOPT_DNS_CACHE_TIMEOUT(3), CURLOPT_IPRESOLVE(3)

ibcurl 8.5.0                   December 4, 2023
                                              CURLOPT_DNS_SHUFFLE_ADDRESSES(3)

curl 8.5.0 - Generated Tue Dec 19 10:28:40 CST 2023
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