1 files changed, 35 insertions, 0 deletions
diff --git a/libempathy/empathy-utils.c b/libempathy/empathy-utils.c
index 0ee1bbcc0..89dd8003c 100644
--- a/libempathy/empathy-utils.c
+++ b/libempathy/empathy-utils.c
@@ -20,6 +20,10 @@
  * Authors: Richard Hult <richard@imendio.com>
  *          Martyn Russell <martyn@imendio.com>
  *          Xavier Claessens <xclaesse@gmail.com>
+ *
+ * Some snippets are taken from GnuTLS 2.8.6, which is distributed under the
+ * same GNU Lesser General Public License 2.1 (or later) version. See
+ * empathy_get_x509_certified_hostname ().
  */
 
 #include "config.h"
@@ -739,3 +743,34 @@ tp_chanel_group_change_reason_from_folks_groups_change_reason (
 {
   return (TpChannelGroupChangeReason) reason;
 }
+
+gchar *
+empathy_get_x509_certificate_hostname (gnutls_x509_crt_t cert)
+{
+  gchar dns_name[256];
+  gsize dns_name_size;
+  gint idx;
+  gint res = 0;
+
+  /* this snippet is taken from GnuTLS.
+   * see gnutls/lib/x509/rfc2818_hostname.c
+   */
+  for (idx = 0; res >= 0; idx++)
+    {
+      dns_name_size = sizeof (dns_name);
+      res = gnutls_x509_crt_get_subject_alt_name (cert, idx,
+          dns_name, &dns_name_size, NULL);
+
+      if (res == GNUTLS_SAN_DNSNAME || res == GNUTLS_SAN_IPADDRESS)
+        return g_strndup (dns_name, dns_name_size);
+    }
+
+  dns_name_size = sizeof (dns_name);
+  res = gnutls_x509_crt_get_dn_by_oid (cert, GNUTLS_OID_X520_COMMON_NAME,
+      0, 0, dns_name, &dns_name_size);
+
+  if (res >= 0)
+    return g_strndup (dns_name, dns_name_size);
+
+  return NULL;
+}