1CURLOPT_CERTINFO(3) curl_easy_setopt options CURLOPT_CERTINFO(3)
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6 CURLOPT_CERTINFO - request SSL certificate information
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9 #include <curl/curl.h>
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11 CURLcode curl_easy_setopt(CURL *handle, CURLOPT_CERTINFO, long certinfo);
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14 Pass a long set to 1 to enable libcurl's certificate chain info gath‐
15 erer. With this enabled, libcurl will extract lots of information and
16 data about the certificates in the certificate chain used in the SSL
17 connection. This data may then be retrieved after a transfer using
18 curl_easy_getinfo(3) and its option CURLINFO_CERTINFO(3).
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21 0
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24 All TLS-based
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27 curl = curl_easy_init();
28 if(curl) {
29 curl_easy_setopt(curl, CURLOPT_URL, "https://www.example.com/");
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31 /* connect to any HTTPS site, trusted or not */
32 curl_easy_setopt(curl, CURLOPT_SSL_VERIFYPEER, 0L);
33 curl_easy_setopt(curl, CURLOPT_SSL_VERIFYHOST, 0L);
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35 curl_easy_setopt(curl, CURLOPT_CERTINFO, 1L);
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37 res = curl_easy_perform(curl);
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39 if (!res) {
40 struct curl_certinfo *ci;
41 res = curl_easy_getinfo(curl, CURLINFO_CERTINFO, &ci);
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43 if (!res) {
44 printf("%d certs!\n", ci->num_of_certs);
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46 for(i = 0; i < ci->num_of_certs; i++) {
47 struct curl_slist *slist;
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49 for(slist = ci->certinfo[i]; slist; slist = slist->next)
50 printf("%s\n", slist->data);
51 }
52 }
53 }
54 curl_easy_cleanup(curl);
55 }
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58 This option is supported by the OpenSSL, GnuTLS, Schannel, NSS, GSKit
59 and Secure Transport backends. Schannel support added in 7.50.0. Secure
60 Transport support added in 7.79.0.
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63 Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION
64 if not.
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67 CURLOPT_CAINFO(3), CURLOPT_SSL_VERIFYPEER(3),
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71libcurl 7.85.0 May 17, 2022 CURLOPT_CERTINFO(3)