CURLOPT_DNS_SERVERS(3)

1CURLOPT_DNS_SERVERS(3)     curl_easy_setopt options     CURLOPT_DNS_SERVERS(3)
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NAME

6       CURLOPT_DNS_SERVERS - set preferred DNS servers
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SYNOPSIS

9       #include <curl/curl.h>
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11       CURLcode   curl_easy_setopt(CURL   *handle,  CURLOPT_DNS_SERVERS,  char
12       *servers);
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DESCRIPTION

15       Pass a char * that is the list of DNS servers to be used instead of the
16       system default.  The format of the dns servers option is:
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18       host[:port][,host[:port]]...
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20       For example:
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22       192.168.1.100,192.168.1.101,3.4.5.6
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24       The  application  does not have to keep the string around after setting
25       this option.
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DEFAULT

28       NULL - use system default
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PROTOCOLS

31       All
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EXAMPLE

34       CURL *curl = curl_easy_init();
35       if(curl) {
36         curl_easy_setopt(curl, CURLOPT_URL, "https://example.com/foo.bin");
37         curl_easy_setopt(curl, CURLOPT_DNS_SERVERS, "192.168.1.100:53,192.168.1.101");
38         ret = curl_easy_perform(curl);
39         curl_easy_cleanup(curl);
40       }
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AVAILABILITY

43       This option requires that libcurl was built  with  a  resolver  backend
44       that supports this operation. The c-ares backend is the only such one.
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46       Added in 7.24.0
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RETURN VALUE

49       Returns  CURLE_OK  if  the option is supported, CURLE_UNKNOWN_OPTION if
50       not,  CURLE_NOT_BUILT_IN  if  support  was  disabled  at  compile-time,
51       CURLE_BAD_FUNCTION_ARGUMENT  when  given  an  invalid  server  list, or
52       CURLE_OUT_OF_MEMORY if there was insufficient heap space.
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