1---
2c: Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.
3SPDX-License-Identifier: curl
4Title: CURLOPT_DNS_LOCAL_IP6
5Section: 3
6Source: libcurl
7See-also:
8  - CURLOPT_DNS_INTERFACE (3)
9  - CURLOPT_DNS_LOCAL_IP4 (3)
10  - CURLOPT_DNS_SERVERS (3)
11Protocol:
12  - All
13---
14
15# NAME
16
17CURLOPT_DNS_LOCAL_IP6 - IPv6 address to bind DNS resolves to
18
19# SYNOPSIS
20
21~~~c
22#include <curl/curl.h>
23
24CURLcode curl_easy_setopt(CURL *handle, CURLOPT_DNS_LOCAL_IP6, char *address);
25~~~
26
27# DESCRIPTION
28
29Set the local IPv6 *address* that the resolver should bind to. The argument
30should be of type char * and contain a single IPv6 address as a string. Set
31this option to NULL to use the default setting (do not bind to a specific IP
32address).
33
34The application does not have to keep the string around after setting this
35option.
36
37# DEFAULT
38
39NULL
40
41# EXAMPLE
42
43~~~c
44int main(void)
45{
46  CURL *curl = curl_easy_init();
47  if(curl) {
48    CURLcode res;
49    curl_easy_setopt(curl, CURLOPT_URL, "https://example.com/foo.bin");
50    curl_easy_setopt(curl, CURLOPT_DNS_LOCAL_IP6, "fe80::a9ff:fe46:b619");
51    res = curl_easy_perform(curl);
52    curl_easy_cleanup(curl);
53  }
54}
55~~~
56
57# AVAILABILITY
58
59This option requires that libcurl was built with a resolver backend that
60supports this operation. The c-ares backend is the only such one.
61
62Added in 7.33.0
63
64# RETURN VALUE
65
66Returns CURLE_OK if the option is supported, CURLE_UNKNOWN_OPTION if not,
67CURLE_NOT_BUILT_IN if support was disabled at compile-time, or
68CURLE_BAD_FUNCTION_ARGUMENT when given a bad address.
69