table of contents
CURLOPT_DNS_SERVERS(3) | curl_easy_setopt options | CURLOPT_DNS_SERVERS(3) |
NAME¶
CURLOPT_DNS_SERVERS - set preferred DNS servers
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¶
November 4, 2020 | libcurl 7.76.1 |