docs/libcurl/opts/CURLOPT_DNS_LOCAL_IP4.3

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.TH CURLOPT_DNS_LOCAL_IP4 3 "November 04, 2020" "libcurl 7.78.0" "curl_easy_setopt options"

.SH NAME
CURLOPT_DNS_LOCAL_IP4 \- IPv4 address to bind DNS resolves to
.SH SYNOPSIS
#include <curl/curl.h>

CURLcode curl_easy_setopt(CURL *handle, CURLOPT_DNS_LOCAL_IP4, char *address);
.SH DESCRIPTION
Set the local IPv4 \fIaddress\fP 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 (don't bind
to a specific IP address).

The application does not have to keep the string around after setting this
option.
.SH DEFAULT
NULL
.SH PROTOCOLS
All
.SH EXAMPLE
.nf
CURL *curl = curl_easy_init();
if(curl) {
  curl_easy_setopt(curl, CURLOPT_URL, "https://example.com/foo.bin");
  curl_easy_setopt(curl, CURLOPT_DNS_LOCAL_IP4, "192.168.0.14");
  ret = curl_easy_perform(curl);
  curl_easy_cleanup(curl);
}
.fi
.SH AVAILABILITY
This option requires that libcurl was built with a resolver backend that
supports this operation. The c-ares backend is the only such one.

Added in 7.33.0
.SH RETURN VALUE
Returns CURLE_OK if the option is supported, CURLE_UNKNOWN_OPTION if not,
CURLE_NOT_BUILT_IN if support was disabled at compile-time, or
CURLE_BAD_FUNCTION_ARGUMENT when given a bad address.
.SH "SEE ALSO"
.BR CURLOPT_DNS_INTERFACE "(3), " CURLOPT_DNS_LOCAL_IP6 "(3), "