CURLOPT_DNS_SHUFFLE_ADDRESScurl)easy_setopt opCURLOPT_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
When a name is resolved and more than one IP address is returned, shuf-
fle the order of all returned addresses so that they will be used in a
random order. This is similar to the ordering behavior of gethostby-
name which is no longer used on most platforms.
Addresses will not be reshuffled if a name resolution is completed us-
ing the DNS cache. CURLOPT_DNS_CACHE_TIMEOUT(3) can be used together
with this option to reduce DNS cache timeout or disable caching en-
tirely if frequent reshuffling is needed.
Since the addresses returned will be reordered randomly, their order
will not be in accordance with RFC 3484 or any other deterministic or-
der that may be generated by the system's name resolution implementa-
tion. This may have performance impacts and may cause IPv4 to be used
before IPv6 or vice versa.
DEFAULT
0 (disabled)
PROTOCOLS
All
EXAMPLE
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),
libcurl 7.81.0 September 08, 20CURLOPT_DNS_SHUFFLE_ADDRESSES(3)
Generated by dwww version 1.14 on Thu Jan 23 06:15:25 CET 2025.