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CURLOPT_DNS_INTERFACE(3) curl_easy_setopt options CURLOPT_DNS_INTERFACE(3)
CURLOPT_DNS_INTERFACE - interface to speak DNS over
CURLcode curl_easy_setopt(CURL *handle, CURLOPT_DNS_INTERFACE, char *ifname);
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 (do not
bind to a specific interface).
The application does not have to keep the string around after setting
All protocols except file:// - protocols that resolve host names.
CURL *curl = curl_easy_init();
curl_easy_setopt(curl, CURLOPT_URL, "https://example.com/foo.bin");
curl_easy_setopt(curl, CURLOPT_DNS_INTERFACE, "eth0");
ret = curl_easy_perform(curl);
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.
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.
libcurl 7.86.0 September 5, 2022 CURLOPT_DNS_INTERFACE(3)