Tribblix: manual page: CURLOPT_DNS_LOCAL

CURLOPT_DNS_LOCAL_IP4(3) Introduction to Library Functions

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).