102 lines
2.4 KiB
Markdown
102 lines
2.4 KiB
Markdown
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---
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c: Copyright (C) Daniel Stenberg, <daniel.se>, et al.
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SPDX-License-Identifier: curl
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Title: CURLINFO_CERTINFO
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Section: 3
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Source: libcurl
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See-also:
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- CURLINFO_CAPATH (3)
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- curl_easy_getinfo (3)
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- curl_easy_setopt (3)
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---
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# NAME
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CURLINFO_CERTINFO - get the TLS certificate chain
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# SYNOPSIS
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~~~c
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#include <curl/curl.h>
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CURLcode curl_easy_getinfo(CURL *handle, CURLINFO_CERTINFO,
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struct curl_certinfo **chainp);
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~~~
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# DESCRIPTION
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Pass a pointer to a *struct curl_certinfo ** and it is set to point to a
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struct that holds info about the server's certificate chain, assuming you had
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CURLOPT_CERTINFO(3) enabled when the request was made.
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~~~c
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struct curl_certinfo {
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int num_of_certs;
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struct curl_slist **certinfo;
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};
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~~~
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The *certinfo* struct member is an array of linked lists of certificate
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information. The *num_of_certs* struct member is the number of certificates
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which is the number of elements in the array. Each certificate's list has
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items with textual information in the format "name:content" such as
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"Subject:Foo", "Issuer:Bar", etc. The items in each list varies depending on
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the SSL backend and the certificate.
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# PROTOCOLS
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All TLS-based
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# EXAMPLE
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~~~c
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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://www.example.com/");
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/* connect to any HTTPS site, trusted or not */
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curl_easy_setopt(curl, CURLOPT_SSL_VERIFYPEER, 0L);
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curl_easy_setopt(curl, CURLOPT_SSL_VERIFYHOST, 0L);
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curl_easy_setopt(curl, CURLOPT_CERTINFO, 1L);
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res = curl_easy_perform(curl);
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if(!res) {
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int i;
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struct curl_certinfo *ci;
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res = curl_easy_getinfo(curl, CURLINFO_CERTINFO, &ci);
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if(!res) {
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printf("%d certs!\n", ci->num_of_certs);
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for(i = 0; i < ci->num_of_certs; i++) {
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struct curl_slist *slist;
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for(slist = ci->certinfo[i]; slist; slist = slist->next)
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printf("%s\n", slist->data);
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}
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}
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}
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curl_easy_cleanup(curl);
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}
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}
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~~~
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See also the *certinfo.c* example.
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# AVAILABILITY
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This option is only working in libcurl built with OpenSSL, GnuTLS, Schannel or
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Secure Transport. GnuTLS support added in 7.42.0. Schannel support added in
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7.50.0. Secure Transport support added in 7.79.0.
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Added in 7.19.1
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# RETURN VALUE
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Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION if not.
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