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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
       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                           2025-02-08          CURLOPT_DNS_LOCAL_IP4(3)

curl 8.12.0 - Generated Fri Feb 14 14:57:48 CST 2025
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