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- .TH CURLOPT_DNS_SERVERS 3 "May 31, 2017" "libcurl 7.61.1" "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, "http://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), "
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