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| .TH CURLOPT_DNS_SERVERS 3 "November 04, 2020" "libcurl 7.78.0" "curl_easy_setopt options" |
| |
| .SH NAME |
| CURLOPT_DNS_SERVERS \- set preferred DNS servers |
| .SH SYNOPSIS |
| #include <curl/curl.h> |
| |
| CURLcode curl_easy_setopt(CURL *handle, CURLOPT_DNS_SERVERS, char *servers); |
| .SH DESCRIPTION |
| Pass a char * that is the list of DNS servers to be used instead of the system |
| default. The format of the dns servers option is: |
| |
| host[:port][,host[:port]]... |
| |
| For example: |
| |
| 192.168.1.100,192.168.1.101,3.4.5.6 |
| |
| The application does not have to keep the string around after setting this |
| option. |
| .SH DEFAULT |
| NULL - use system default |
| .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_SERVERS, "192.168.1.100:53,192.168.1.101"); |
| 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 7.24.0 |
| .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, |
| CURLE_BAD_FUNCTION_ARGUMENT when given an invalid server list, or |
| CURLE_OUT_OF_MEMORY if there was insufficient heap space. |
| .SH "SEE ALSO" |
| .BR CURLOPT_DNS_LOCAL_IP4 "(3), " CURLOPT_DNS_CACHE_TIMEOUT "(3), " |
