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CURLOPT_DNS_INTERFACE(3)   Library Functions Manual   CURLOPT_DNS_INTERFACE(3)

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.

       Using this option multiple times	makes the last set string override the
       previous	ones. Set it to	NULL to	disable	its use	again.

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
       curl_easy_setopt(3) returns a CURLcode indicating success or error.

       CURLE_OK	(0) means everything was OK, non-zero means an error occurred,
       see libcurl-errors(3).

SEE ALSO
       CURLOPT_DNS_LOCAL_IP4(3),	 CURLOPT_DNS_LOCAL_IP6(3),	  CUR-
       LOPT_DNS_SERVERS(3), CURLOPT_INTERFACE(3)

libcurl				  2025-06-03	      CURLOPT_DNS_INTERFACE(3)

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