2024-03-15 20:55:33 -06:00
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.\" generated by cd2nroff 0.1 from CURLOPT_DOH_URL.md
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2024-08-02 19:52:59 -06:00
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.TH CURLOPT_DOH_URL 3 "2024-08-02" libcurl
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.SH NAME
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CURLOPT_DOH_URL \- provide the DNS\-over\-HTTPS URL
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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_DOH_URL, char *URL);
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.fi
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.SH DESCRIPTION
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Pass in a pointer to a \fIURL\fP for the DoH server to use for name resolving. The
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parameter should be a char pointer to a null\-terminated string which must be a
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valid and correct HTTPS URL.
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libcurl does not validate the syntax or use this variable until the transfer
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is issued. Even if you set a crazy value here, \fIcurl_easy_setopt(3)\fP still
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returns \fICURLE_OK\fP.
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curl sends POST requests to the given DNS\-over\-HTTPS URL.
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To find the DoH server itself, which might be specified using a name, libcurl
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uses the default name lookup function. You can bootstrap that by providing the
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address for the DoH server with \fICURLOPT_RESOLVE(3)\fP.
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Disable DoH use again by setting this option to NULL.
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.SH INHERIT OPTIONS
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DoH lookups use SSL and some SSL settings from your transfer are inherited,
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like \fICURLOPT_SSL_CTX_FUNCTION(3)\fP.
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The hostname and peer certificate verification settings are not inherited but
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can be controlled separately via \fICURLOPT_DOH_SSL_VERIFYHOST(3)\fP and
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\fICURLOPT_DOH_SSL_VERIFYPEER(3)\fP.
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A set \fICURLOPT_OPENSOCKETFUNCTION(3)\fP callback is not inherited.
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.SH KNOWN BUGS
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Even when DoH is set to be used with this option, there are still some name
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resolves that are performed without it, using the default name resolver
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mechanism. This includes name resolves done for \fICURLOPT_INTERFACE(3)\fP,
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\fICURLOPT_FTPPORT(3)\fP, a proxy type set to \fBCURLPROXY_SOCKS4\fP or
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\fBCURLPROXY_SOCKS5\fP and probably some more.
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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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curl_easy_setopt(curl, CURLOPT_URL, "https://example.com");
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curl_easy_setopt(curl, CURLOPT_DOH_URL, "https://dns.example.com");
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curl_easy_perform(curl);
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}
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}
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.fi
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.SH AVAILABILITY
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Added in curl 7.62.0
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.SH RETURN VALUE
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Returns CURLE_OK on success or CURLE_OUT_OF_MEMORY if there was insufficient
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heap space.
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Note that \fIcurl_easy_setopt(3)\fP does immediately parse the given string so
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when given a bad DoH URL, libcurl might not detect the problem until it later
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tries to resolve a name with it.
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.SH SEE ALSO
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.BR CURLOPT_DNS_CACHE_TIMEOUT (3),
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.BR CURLOPT_RESOLVE (3),
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.BR CURLOPT_VERBOSE (3)
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