CURLINFO_CERTINFO - get the TLS certificate chain
#include <curl/curl.h> CURLcode curl_easy_getinfo(CURL *handle, CURLINFO_CERTINFO, struct curl_certinfo **chainp);
CURLINFO_CERTINFO(3) curl_easy_getinfo options CURLINFO_CERTINFO(3) NAME CURLINFO_CERTINFO - get the TLS certificate chain SYNOPSIS #include <curl/curl.h> CURLcode curl_easy_getinfo(CURL *handle, CURLINFO_CERTINFO, struct curl_certinfo **chainp); DESCRIPTION Pass a pointer to a 'struct curl_certinfo *' and you will get it set to point to a struct that holds a number of linked lists with info about the certificate chain, assuming you had CURLOPT_CERTINFO(3) enabled when the request was made. The struct reports how many certs it found and then you can extract info for each of those certs by following the linked lists. The info chain is provided in a series of data in the format "name:content" where the content is for the specific named data. See also the certinfo.c example. PROTOCOLS All TLS-based EXAMPLE curl = curl_easy_init(); if(curl) { curl_easy_setopt(curl, CURLOPT_URL, "https://www.example.com/"); /* connect to any HTTPS site, trusted or not */ curl_easy_setopt(curl, CURLOPT_SSL_VERIFYPEER, 0L); curl_easy_setopt(curl, CURLOPT_SSL_VERIFYHOST, 0L); curl_easy_setopt(curl, CURLOPT_CERTINFO, 1L); res = curl_easy_perform(curl); if (!res) { struct curl_certinfo *ci; res = curl_easy_getinfo(curl, CURLINFO_CERTINFO, &ci); if (!res) { printf("%d certs!\n", ci->num_of_certs); for(i = 0; i < ci->num_of_certs; i++) { struct curl_slist *slist; for(slist = ci->certinfo[i]; slist; slist = slist->next) printf("%s\n", slist->data); } } } curl_easy_cleanup(curl); } AVAILABILITY This option is only working in libcurl built with OpenSSL, NSS, Schan- nel, GSKit or Secure Transport support. Schannel support added in 7.50.0. Secure Transport support added in 7.79.0. Added in 7.19.1 RETURN VALUE Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION if not. ATTRIBUTES See attributes(7) for descriptions of the following attributes: +---------------+------------------+ |ATTRIBUTE TYPE | ATTRIBUTE VALUE | +---------------+------------------+ |Availability | web/curl | +---------------+------------------+ |Stability | Uncommitted | +---------------+------------------+ SEE ALSO curl_easy_getinfo(3), curl_easy_setopt(3), NOTES Source code for open source software components in Oracle Solaris can be found at https://www.oracle.com/downloads/opensource/solaris-source- code-downloads.html. This software was built from source available at https://github.com/oracle/solaris-userland. The original community source was downloaded from https://curl.se/down- load/curl-7.83.1.tar.bz2. Further information about this software can be found on the open source community website at http://curl.haxx.se/. libcurl 7.83.1 November 26, 2021 CURLINFO_CERTINFO(3)