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 argument should be of type char * and
       contain a single numerical IPv4 address 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), CURLOPT_DNS_SERVERS(3)

libcurl                                            2025-06-16                           CURLOPT_DNS_LOCAL_IP4(3)