dtls: Fix compiler warnings with openssl 1.1 or newer

- DTLSv1_method() is deprecated, and since 1.0.2 replaced by
  DTLS_method().
- CRYPTO_set_locking_callback() and CRYPTO_set_id_callback() are
  no-ops (empty macros) since 1.1 and are not supposed to be used
  anymore.

gstdtlsagent.c: In function ‘gst_dtls_agent_init’:
gstdtlsagent.c:173:3: error: ‘DTLSv1_method’ is deprecated [-Werror=deprecated-declarations]
   priv->ssl_context = SSL_CTX_new (DTLSv1_method ());
   ^~~~
In file included from /usr/include/openssl/ct.h:13:0,
                 from /usr/include/openssl/ssl.h:61,
                 from gstdtlsagent.c:40:
/usr/include/openssl/ssl.h:1614:1: note: declared here
 DEPRECATEDIN_1_1_0(__owur const SSL_METHOD *DTLSv1_method(void)) /* DTLSv1.0 */
 ^
At top level:
gstdtlsagent.c:103:1: error: ‘ssl_thread_id_function’ defined but not used [-Werror=unused-function]
 ssl_thread_id_function (void)
 ^~~~~~~~~~~~~~~~~~~~~~
gstdtlsagent.c:73:1: error: ‘ssl_locking_function’ defined but not used [-Werror=unused-function]
 ssl_locking_function (gint mode, gint lock_num, const gchar * file, gint line)
 ^~~~~~~~~~~~~~~~~~~~

2 files changed, 19 insertions, 10 deletions

diff --git a/ext/dtls/gstdtlsagent.c b/ext/dtls/gstdtlsagent.c
index c18212387..6ec39fcbc 100644
--- a/ext/dtls/gstdtlsagent.c
+++ b/ext/dtls/gstdtlsagent.c
@@ -67,6 +67,7 @@ static void gst_dtls_agent_set_property (GObject *, guint prop_id,
     const GValue *, GParamSpec *);
 const gchar *gst_dtls_agent_peek_id (GstDtlsAgent *);
 
+#if OPENSSL_VERSION_NUMBER < 0x10100000L
 static GRWLock *ssl_locks;
 
 static void
@@ -104,13 +105,12 @@ ssl_thread_id_function (void)
 {
   return (gulong) g_thread_self ();
 }
+#endif
 
 void
 _gst_dtls_init_openssl (void)
 {
   static gsize is_init = 0;
-  gint i;
-  gint num_locks;
 
   if (g_once_init_enter (&is_init)) {
     GST_DEBUG_CATEGORY_INIT (gst_dtls_agent_debug, "dtlsagent", 0,
@@ -128,13 +128,19 @@ _gst_dtls_init_openssl (void)
     SSL_load_error_strings ();
     ERR_load_BIO_strings ();
 
-    num_locks = CRYPTO_num_locks ();
-    ssl_locks = g_new (GRWLock, num_locks);
-    for (i = 0; i < num_locks; ++i) {
-      g_rw_lock_init (&ssl_locks[i]);
+#if OPENSSL_VERSION_NUMBER < 0x10100000L
+    {
+      gint i;
+      gint num_locks;
+      num_locks = CRYPTO_num_locks ();
+      ssl_locks = g_new (GRWLock, num_locks);
+      for (i = 0; i < num_locks; ++i) {
+        g_rw_lock_init (&ssl_locks[i]);
+      }
+      CRYPTO_set_locking_callback (ssl_locking_function);
+      CRYPTO_set_id_callback (ssl_thread_id_function);
     }
-    CRYPTO_set_locking_callback (ssl_locking_function);
-    CRYPTO_set_id_callback (ssl_thread_id_function);
+#endif
 
     g_once_init_leave (&is_init, 1);
   }
@@ -170,7 +176,11 @@ gst_dtls_agent_init (GstDtlsAgent * self)
 
   ERR_clear_error ();
 
+#if OPENSSL_VERSION_NUMBER >= 0x1000200fL
+  priv->ssl_context = SSL_CTX_new (DTLS_method ());
+#else
   priv->ssl_context = SSL_CTX_new (DTLSv1_method ());
+#endif
   if (ERR_peek_error () || !priv->ssl_context) {
     char buf[512];
 
diff --git a/ext/dtls/gstdtlssrtpdec.c b/ext/dtls/gstdtlssrtpdec.c
index 300fb9c8f..983621001 100644
--- a/ext/dtls/gstdtlssrtpdec.c
+++ b/ext/dtls/gstdtlssrtpdec.c
@@ -171,8 +171,7 @@ gst_dtls_srtp_dec_init (GstDtlsSrtpDec * self)
         "failed to create srtp_dec, is the srtp plugin registered?");
     return;
   }
-  self->dtls_srtp_demux =
-      gst_element_factory_make ("dtlssrtpdemux", NULL);
+  self->dtls_srtp_demux = gst_element_factory_make ("dtlssrtpdemux", NULL);
   if (!self->dtls_srtp_demux) {
     GST_ERROR_OBJECT (self, "failed to create dtls_srtp_demux");
     return;