NAME

       CURLOPT_DNS_INTERFACE - interface to speak DNS over

SYNOPSIS

       #include <curl/curl.h>

       CURLcode curl_easy_setopt(CURL *handle, CURLOPT_DNS_INTERFACE, char *ifname);

DESCRIPTION

       Pass a char pointer as parameter. Set the name of the network interface that the DNS resolver should bind
       to.  This  must be an interface name (not an address). Set this option to NULL to use the default setting
       (do not bind to a specific interface).

       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_INTERFACE, "eth0");
           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 7.33.0

RETURN VALUE

       Returns  CURLE_OK  if  the  option  is  supported,  CURLE_UNKNOWN_OPTION if not, or CURLE_NOT_BUILT_IN if
       support was disabled at compile-time.

SEE ALSO

       CURLOPT_DNS_LOCAL_IP4(3), CURLOPT_DNS_LOCAL_IP6(3), CURLOPT_DNS_SERVERS(3), CURLOPT_INTERFACE(3)

libcurl                                            2024-12-11                           CURLOPT_DNS_INTERFACE(3)