CURLOPT_DNS_SERVERS(3) Library Functions Manual CURLOPT_DNS_SERVERS(3)
NAME
CURLOPT_DNS_SERVERS - DNS servers to use
SYNOPSIS
#include <curl/curl.h>
CURLcode curl_easy_setopt(CURL *handle, CURLOPT_DNS_SERVERS, char *servers);
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.
DEFAULT
NULL
PROTOCOLS
This functionality affects all supported protocols
EXAMPLE
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);
}
}
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.
AVAILABILITY
Added in curl 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
CURLOPT_DNS_CACHE_TIMEOUT(3), CURLOPT_DNS_LOCAL_IP4(3),
CURLOPT_DNS_LOCAL_IP6(3)
libcurl 2024-08-05 CURLOPT_DNS_SERVERS(3)
curl 8.9.1 - Generated Mon Aug 5 15:01:38 CDT 2024