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63 lines
1.7 KiB
Groff
63 lines
1.7 KiB
Groff
.\" generated by cd2nroff 0.1 from CURLOPT_DNS_SERVERS.md
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.TH CURLOPT_DNS_SERVERS 3 "2024-11-09" libcurl
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.SH NAME
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CURLOPT_DNS_SERVERS \- DNS servers to use
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.SH SYNOPSIS
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.nf
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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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.fi
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.SH 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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.nf
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host[:port][,host[:port]]...
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.fi
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For example:
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.nf
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192.168.1.100,192.168.1.101,3.4.5.6
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.fi
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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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Using this option multiple times makes the last set string override the
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previous ones. Set it to NULL to disable its use again.
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.SH DEFAULT
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NULL
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.SH PROTOCOLS
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This functionality affects all supported protocols
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.SH EXAMPLE
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.nf
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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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.fi
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.SH NOTES
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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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.SH AVAILABILITY
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Added in curl 7.24.0
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.SH 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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.SH SEE ALSO
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.BR CURLOPT_DNS_CACHE_TIMEOUT (3),
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.BR CURLOPT_DNS_LOCAL_IP4 (3),
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.BR CURLOPT_DNS_LOCAL_IP6 (3)
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