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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