CURLOPT_DOH_SSL_VERIFYHOST(3)

1CURLOPT_DOH_SSL_VERIFYHOST(3c)url_easy_setopt optionCsURLOPT_DOH_SSL_VERIFYHOST(3)
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NAME

6       CURLOPT_DOH_SSL_VERIFYHOST  -  verify the host name in the DoH SSL cer‐
7       tificate
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SYNOPSIS

10       #include <curl/curl.h>
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12       CURLcode  curl_easy_setopt(CURL  *handle,   CURLOPT_DOH_SSL_VERIFYHOST,
13       long verify);
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DESCRIPTION

16       Pass a long set to 2L as asking curl to verify the DoH (DNS-over-HTTPS)
17       server's certificate name fields against the host name.
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19       This option is the DoH equivalent of CURLOPT_SSL_VERIFYHOST(3) and only
20       affects requests to the DoH server.
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22       When  CURLOPT_DOH_SSL_VERIFYHOST(3)  is 2, the SSL certificate provided
23       by the DoH server must indicate that the server name is the same as the
24       server name to which you meant to connect to, or the connection fails.
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26       Curl  considers  the  DoH  server the intended one when the Common Name
27       field or a Subject Alternate Name field in the certificate matches  the
28       host name in the DoH URL to which you told Curl to connect.
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30       When  the  verify value is set to 1L it is treated the same as 2L. How‐
31       ever for consistency with the other VERIFYHOST options we suggest use 2
32       and not 1.
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34       When  the verify value is set to 0L, the connection succeeds regardless
35       of the names used in the certificate. Use that ability with caution!
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37       See also CURLOPT_DOH_SSL_VERIFYPEER(3) to verify the digital  signature
38       of  the  DoH  server  certificate.  If libcurl is built against NSS and
39       CURLOPT_DOH_SSL_VERIFYPEER(3) is zero, CURLOPT_DOH_SSL_VERIFYHOST(3) is
40       also set to zero and cannot be overridden.
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DEFAULT

43       2
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PROTOCOLS

46       DoH
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EXAMPLE

49       CURL *curl = curl_easy_init();
50       if(curl) {
51         curl_easy_setopt(curl, CURLOPT_URL, "https://example.com");
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53         curl_easy_setopt(curl, CURLOPT_DOH_URL, "https://cloudflare-dns.com/dns-query");
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55         /* Disable host name verification of the DoH server */
56         curl_easy_setopt(curl, CURLOPT_DOH_SSL_VERIFYHOST, 0L);
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58         curl_easy_perform(curl);
59       }
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AVAILABILITY

62       Added in 7.76.0
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64       If built TLS enabled.
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RETURN VALUE

67       Returns  CURLE_OK  if the option is supported, and CURLE_UNKNOWN_OPTION
68       if not.
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