secur32: Add support for setting DTLS MTU.

dlls/secur32/schannel.c

@@ -879,6 +879,13 @@ static SECURITY_STATUS SEC_ENTRY schan_InitializeSecurityContextW(
             schan_imp_set_application_protocols(ctx->session, buffer->pvBuffer, buffer->cbBuffer);
         }
 
+        if (pInput && (idx = schan_find_sec_buffer_idx(pInput, 0, SECBUFFER_DTLS_MTU)) != -1)
+        {
+            buffer = &pInput->pBuffers[idx];
+            if (buffer->cbBuffer >= sizeof(WORD)) schan_imp_set_dtls_mtu(ctx->session, *(WORD *)buffer->pvBuffer);
+            else WARN("invalid buffer size %u\n", buffer->cbBuffer);
+        }
+
         phNewContext->dwLower = handle;
         phNewContext->dwUpper = 0;
     }

dlls/secur32/schannel_gnutls.c

@@ -53,6 +53,7 @@ static int (*pgnutls_cipher_get_block_size)(gnutls_cipher_algorithm_t);
 /* Not present in gnutls version < 3.0. */
 static void (*pgnutls_transport_set_pull_timeout_function)(gnutls_session_t,
                                                            int (*)(gnutls_transport_ptr_t, unsigned int));
+static void (*pgnutls_dtls_set_mtu)(gnutls_session_t, unsigned int);
 
 /* Not present in gnutls version < 3.2.0. */
 static int (*pgnutls_alpn_get_selected_protocol)(gnutls_session_t, gnutls_datum_t *);
@@ -186,6 +187,11 @@ static int compat_gnutls_alpn_set_protocols(gnutls_session_t session, const gnut
     return GNUTLS_E_INVALID_REQUEST;
 }
 
+static void compat_gnutls_dtls_set_mtu(gnutls_session_t session, unsigned int mtu)
+{
+    FIXME("\n");
+}
+
 static ssize_t schan_pull_adapter(gnutls_transport_ptr_t transport,
                                       void *buff, size_t buff_len)
 {
@@ -767,6 +773,15 @@ SECURITY_STATUS schan_imp_get_application_protocol(schan_imp_session session,
     return SEC_E_OK;
 }
 
+SECURITY_STATUS schan_imp_set_dtls_mtu(schan_imp_session session, unsigned int mtu)
+{
+    gnutls_session_t s = (gnutls_session_t)session;
+
+    pgnutls_dtls_set_mtu(s, mtu);
+    TRACE("MTU set to %u\n", mtu);
+    return SEC_E_OK;
+}
+
 static WCHAR *get_key_container_path(const CERT_CONTEXT *ctx)
 {
     static const WCHAR rsabaseW[] =
@@ -1130,6 +1145,11 @@ BOOL schan_imp_init(void)
         WARN("gnutls_alpn_get_selected_protocol not found\n");
         pgnutls_alpn_get_selected_protocol = compat_gnutls_alpn_get_selected_protocol;
     }
+    if (!(pgnutls_dtls_set_mtu = dlsym(libgnutls_handle, "gnutls_dtls_set_mtu")))
+    {
+        WARN("gnutls_dtls_set_mtu not found\n");
+        pgnutls_dtls_set_mtu = compat_gnutls_dtls_set_mtu;
+    }
     if (!(pgnutls_privkey_export_x509 = dlsym(libgnutls_handle, "gnutls_privkey_export_x509")))
     {
         WARN("gnutls_privkey_export_x509 not found\n");

dlls/secur32/schannel_macosx.c

@@ -1213,6 +1213,12 @@ SECURITY_STATUS schan_imp_get_application_protocol(schan_imp_session session,
     return SEC_E_UNSUPPORTED_FUNCTION;
 }
 
+SECURITY_STATUS schan_imp_set_dtls_mtu(schan_imp_session session, unsigned int mtu)
+{
+    FIXME("no support for setting dtls mtu on this platform\n");
+    return SEC_E_UNSUPPORTED_FUNCTION;
+}
+
 BOOL schan_imp_init(void)
 {
     TRACE("()\n");

dlls/secur32/secur32_priv.h

@@ -253,5 +253,6 @@ extern void schan_imp_deinit(void) DECLSPEC_HIDDEN;
 extern void schan_imp_set_application_protocols(schan_imp_session, unsigned char *, unsigned int) DECLSPEC_HIDDEN;
 extern SECURITY_STATUS schan_imp_get_application_protocol(schan_imp_session,
                                                           SecPkgContext_ApplicationProtocol *) DECLSPEC_HIDDEN;
+extern SECURITY_STATUS schan_imp_set_dtls_mtu(schan_imp_session, unsigned int) DECLSPEC_HIDDEN;
 
 #endif /* ndef __SECUR32_PRIV_H__ */