1--- 2c: Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al. 3SPDX-License-Identifier: curl 4Title: CURLOPT_DNS_SERVERS 5Section: 3 6Source: libcurl 7See-also: 8 - CURLOPT_DNS_CACHE_TIMEOUT (3) 9 - CURLOPT_DNS_LOCAL_IP4 (3) 10 - CURLOPT_DNS_LOCAL_IP6 (3) 11Protocol: 12 - All 13Added-in: 7.24.0 14--- 15 16# NAME 17 18CURLOPT_DNS_SERVERS - DNS servers to use 19 20# SYNOPSIS 21 22~~~c 23#include <curl/curl.h> 24 25CURLcode curl_easy_setopt(CURL *handle, CURLOPT_DNS_SERVERS, char *servers); 26~~~ 27 28# DESCRIPTION 29 30Pass a char pointer that is the list of DNS servers to be used instead of the 31system default. The format of the dns servers option is: 32 33 host[:port][,host[:port]]... 34 35For example: 36 37 192.168.1.100,192.168.1.101,3.4.5.6 38 39The application does not have to keep the string around after setting this 40option. 41 42Using this option multiple times makes the last set string override the 43previous ones. Set it to NULL to disable its use again. 44 45# DEFAULT 46 47NULL 48 49# %PROTOCOLS% 50 51# EXAMPLE 52 53~~~c 54int main(void) 55{ 56 CURL *curl = curl_easy_init(); 57 if(curl) { 58 CURLcode res; 59 curl_easy_setopt(curl, CURLOPT_URL, "https://example.com/foo.bin"); 60 curl_easy_setopt(curl, CURLOPT_DNS_SERVERS, 61 "192.168.1.100:53,192.168.1.101"); 62 res = curl_easy_perform(curl); 63 curl_easy_cleanup(curl); 64 } 65} 66~~~ 67 68# NOTES 69 70This option requires that libcurl was built with a resolver backend that 71supports this operation. The c-ares backend is the only such one. 72 73# %AVAILABILITY% 74 75# RETURN VALUE 76 77curl_easy_setopt(3) returns a CURLcode indicating success or error. 78 79CURLE_OK (0) means everything was OK, non-zero means an error occurred, see 80libcurl-errors(3). 81