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CURLOPT_DNS_LOCAL_IP4(3)   Library Functions Manual   CURLOPT_DNS_LOCAL_IP4(3)

NAME
       CURLOPT_DNS_LOCAL_IP4 - IPv4 address to bind DNS	resolves to

SYNOPSIS
       #include	<curl/curl.h>

       CURLcode	curl_easy_setopt(CURL *handle, CURLOPT_DNS_LOCAL_IP4, char *address);

DESCRIPTION
       Set  the	local IPv4 address that	the resolver should bind to. The argu-
       ment should be of type char * and contain a single numerical  IPv4  ad-
       dress  as  a string. Set	this option to NULL to use the default setting
       (do not bind to a specific IP address).

       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_LOCAL_IP4, "192.168.0.14");
	   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_INTERFACE(3),	CURLOPT_DNS_LOCAL_IP6(3),	  CUR-
       LOPT_DNS_SERVERS(3)

libcurl				  2025-06-03	      CURLOPT_DNS_LOCAL_IP4(3)

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