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\begin{verbatim}
#include <stdio.h>
#include <stdlib.h>
#include <gnutls/gnutls.h>
#include <gnutls/x509.h>
/* This callback should be associated with a session by calling
* gnutls_certificate_client_set_select_function( session, cert_callback),
* before a handshake.
*/
static int cert_callback(gnutls_session session,
const gnutls_datum * client_certs, int client_certs_num,
const gnutls_datum * req_ca_rdn, int nreqs)
{
char issuer_dn[256];
int i, ret;
size_t len;
/* Print the server's trusted CAs
*/
if (nreqs > 0)
printf("- Server's trusted authorities:\n");
else
printf("- Server did not send us any trusted authorities names.\n");
/* print the names (if any) */
for (i = 0; i < nreqs; i++) {
len = sizeof(issuer_dn);
ret = gnutls_x509_rdn_get(&req_ca_rdn[i], issuer_dn, &len);
if (ret >= 0) {
printf(" [%d]: ", i);
printf("%s\n", issuer_dn);
}
}
/* Select a certificate from the client_certs and return its
* index.
*/
return -1;
}
\end{verbatim}
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