91 lines
1.9 KiB
Markdown
91 lines
1.9 KiB
Markdown
---
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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: CURLOPT_CERTINFO
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Section: 3
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Source: libcurl
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See-also:
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- CURLINFO_CAINFO (3)
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- CURLINFO_CAPATH (3)
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- CURLINFO_CERTINFO (3)
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- CURLOPT_CAINFO (3)
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- CURLOPT_SSL_VERIFYPEER (3)
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---
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# NAME
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CURLOPT_CERTINFO - request SSL certificate information
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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_setopt(CURL *handle, CURLOPT_CERTINFO, long certinfo);
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~~~
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# DESCRIPTION
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Pass a long set to 1 to enable libcurl's certificate chain info gatherer. With
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this enabled, libcurl extracts lots of information and data about the
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certificates in the certificate chain used in the SSL connection. This data
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may then be retrieved after a transfer using curl_easy_getinfo(3) and
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its option CURLINFO_CERTINFO(3).
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# DEFAULT
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0
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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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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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int i;
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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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# AVAILABILITY
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This option is supported by the OpenSSL, GnuTLS, Schannel and Secure
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Transport backends. Schannel support added in 7.50.0. Secure Transport support
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added in 7.79.0.
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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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