CURLOPT_DNS_INTERFACE(3)   curl_easy_setopt options   CURLOPT_DNS_INTERFACE(3)

NAME
       CURLOPT_DNS_INTERFACE - set 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 * 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 (don't
       bind to a specific interface).

       The application does not have to keep the string around after setting
       this option.

DEFAULT
       NULL

PROTOCOLS
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_INTERFACE, "eth0");
         ret = curl_easy_perform(curl);
         curl_easy_cleanup(curl);
       }

AVAILABILITY
       Added in 7.33.0. This option also requires that libcurl was built with
       a resolver backend that supports this operation. The c-ares backend is
       the only such one.

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_SERVERS(3), CURLOPT_DNS_LOCAL_IP4(3),

libcurl 7.77.0                 November 4, 2020       CURLOPT_DNS_INTERFACE(3)