77 lines
1.6 KiB
Markdown
77 lines
1.6 KiB
Markdown
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---
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c: Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.
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SPDX-License-Identifier: curl
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Title: CURLOPT_DNS_SERVERS
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Section: 3
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Source: libcurl
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See-also:
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- CURLOPT_DNS_CACHE_TIMEOUT (3)
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- CURLOPT_DNS_LOCAL_IP4 (3)
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- CURLOPT_DNS_LOCAL_IP6 (3)
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---
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# NAME
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CURLOPT_DNS_SERVERS - DNS servers to use
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# SYNOPSIS
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~~~c
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#include <curl/curl.h>
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CURLcode curl_easy_setopt(CURL *handle, CURLOPT_DNS_SERVERS, char *servers);
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~~~
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# DESCRIPTION
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Pass a char pointer that is the list of DNS servers to be used instead of the
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system default. The format of the dns servers option is:
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host[:port][,host[:port]]...
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For example:
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192.168.1.100,192.168.1.101,3.4.5.6
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The application does not have to keep the string around after setting this
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option.
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# DEFAULT
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NULL - use system default
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# PROTOCOLS
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All
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# EXAMPLE
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~~~c
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int main(void)
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{
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CURL *curl = curl_easy_init();
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if(curl) {
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CURLcode res;
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curl_easy_setopt(curl, CURLOPT_URL, "https://example.com/foo.bin");
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curl_easy_setopt(curl, CURLOPT_DNS_SERVERS,
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"192.168.1.100:53,192.168.1.101");
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res = curl_easy_perform(curl);
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curl_easy_cleanup(curl);
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}
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}
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~~~
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# AVAILABILITY
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This option requires that libcurl was built with a resolver backend that
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supports this operation. The c-ares backend is the only such one.
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Added in 7.24.0
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# RETURN VALUE
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Returns CURLE_OK if the option is supported, CURLE_UNKNOWN_OPTION if not,
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CURLE_NOT_BUILT_IN if support was disabled at compile-time,
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CURLE_BAD_FUNCTION_ARGUMENT when given an invalid server list, or
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CURLE_OUT_OF_MEMORY if there was insufficient heap space.
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