.\" generated by cd2nroff 0.1 from CURLOPT_DNS_SERVERS.md
.TH CURLOPT_DNS_SERVERS 3 "2024-11-18" libcurl
.SH NAME
CURLOPT_DNS_SERVERS \- DNS servers to use
.SH SYNOPSIS
.nf
#include <curl/curl.h>

CURLcode curl_easy_setopt(CURL *handle, CURLOPT_DNS_SERVERS, char *servers);
.fi
.SH 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.
.SH DEFAULT
NULL
.SH PROTOCOLS
This functionality affects all supported protocols
.SH EXAMPLE
.nf
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);
  }
}
.fi
.SH 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.
.SH AVAILABILITY
Added in curl 7.24.0
.SH 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.
.SH SEE ALSO
.BR CURLOPT_DNS_CACHE_TIMEOUT (3),
.BR CURLOPT_DNS_LOCAL_IP4 (3),
.BR CURLOPT_DNS_LOCAL_IP6 (3)