CURLOPT_DNS_SHUFFLE_ADDRESSES - shuffle IP addresses for hostname
#include <curl/curl.h> CURLcode curl_easy_setopt(CURL *handle, CURLOPT_DNS_SHUFFLE_ADDRESSES, long onoff);
curl_easy_setopt options 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 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 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 will be reordered randomly, their order will not be in accordance with RFC 3484 or any other deterministic order 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. ATTRIBUTES See attributes(7) for descriptions of the following attributes: +---------------+------------------+ |ATTRIBUTE TYPE | ATTRIBUTE VALUE | +---------------+------------------+ |Availability | web/curl | +---------------+------------------+ |Stability | Uncommitted | +---------------+------------------+ SEE ALSO CURLOPT_DNS_CACHE_TIMEOUT(3), CURLOPT_IPRESOLVE(3), NOTES Source code for open source software components in Oracle Solaris can be found at https://www.oracle.com/downloads/opensource/solaris-source- code-downloads.html. This software was built from source available at https://github.com/oracle/solaris-userland. The original community source was downloaded from https://curl.se/down- load/curl-7.83.1.tar.bz2. Further information about this software can be found on the open source community website at http://curl.haxx.se/. libcurl 7.83.1 September 08, 2021 CURLOPT_DNS_SHUFFLE_ADDRESSES(3)