--- /dev/null
+
+/* ***** BEGIN LICENSE BLOCK *****
+ * Version: MPL 1.1/GPL 2.0/LGPL 2.1
+ *
+ * The contents of this file are subject to the Mozilla Public License Version
+ * 1.1 (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ * http://www.mozilla.org/MPL/
+ *
+ * Software distributed under the License is distributed on an "AS IS" basis,
+ * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
+ * for the specific language governing rights and limitations under the
+ * License.
+ *
+ * The Original Code is guacd.
+ *
+ * The Initial Developer of the Original Code is
+ * Michael Jumper.
+ * Portions created by the Initial Developer are Copyright (C) 2010
+ * the Initial Developer. All Rights Reserved.
+ *
+ * Contributor(s):
+ *
+ * Alternatively, the contents of this file may be used under the terms of
+ * either the GNU General Public License Version 2 or later (the "GPL"), or
+ * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
+ * in which case the provisions of the GPL or the LGPL are applicable instead
+ * of those above. If you wish to allow use of your version of this file only
+ * under the terms of either the GPL or the LGPL, and not to allow others to
+ * use your version of this file under the terms of the MPL, indicate your
+ * decision by deleting the provisions above and replace them with the notice
+ * and other provisions required by the GPL or the LGPL. If you do not delete
+ * the provisions above, a recipient may use your version of this file under
+ * the terms of any one of the MPL, the GPL or the LGPL.
+ *
+ * ***** END LICENSE BLOCK ***** */
+
+
+#ifndef _GUACD_CLIENT_H
+#define _GUACD_CLIENT_H
+
+/**
+ * Provides functions and structures required for defining (and handling) a proxy client.
+ *
+ * @file client.h
+ */
+
+/**
+ * The time to allow between sync responses in milliseconds. If a sync
+ * instruction is sent to the client and no response is received within this
+ * timeframe, server messages will not be handled until a sync instruction is
+ * received from the client.
+ */
+#define GUAC_SYNC_THRESHOLD 500
+
+/**
+ * The time to allow between server sync messages in milliseconds. A sync
+ * message from the server will be sent every GUAC_SYNC_FREQUENCY milliseconds.
+ * As this will induce a response from a client that is not malfunctioning,
+ * this is used to detect when a client has died. This must be set to a
+ * reasonable value to avoid clients being disconnected unnecessarily due
+ * to timeout.
+ */
+#define GUAC_SYNC_FREQUENCY 5000
+
+/**
+ * The amount of time to wait after handling server messages. If a client
+ * plugin has a message handler, and sends instructions when server messages
+ * are being handled, there will be a pause of this many milliseconds before
+ * the next call to the message handler.
+ */
+#define GUAC_SERVER_MESSAGE_HANDLE_FREQUENCY 50
+
+/**
+ * The number of milliseconds to wait for messages in any phase before
+ * timing out and closing the connection with an error.
+ */
+#define GUAC_TIMEOUT 15000
+
+/**
+ * The number of microseconds to wait for messages in any phase before
+ * timing out and closing the conncetion with an error. This is always
+ * equal to GUAC_TIMEOUT * 1000.
+ */
+#define GUAC_USEC_TIMEOUT (GUAC_TIMEOUT*1000)
+
+
+void guac_client_stop(guac_client* client);
+int guac_start_client(guac_client* client);
+
+#endif
--- /dev/null
+
+/* ***** BEGIN LICENSE BLOCK *****
+ * Version: MPL 1.1/GPL 2.0/LGPL 2.1
+ *
+ * The contents of this file are subject to the Mozilla Public License Version
+ * 1.1 (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ * http://www.mozilla.org/MPL/
+ *
+ * Software distributed under the License is distributed on an "AS IS" basis,
+ * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
+ * for the specific language governing rights and limitations under the
+ * License.
+ *
+ * The Original Code is guacd.
+ *
+ * The Initial Developer of the Original Code is
+ * Michael Jumper.
+ * Portions created by the Initial Developer are Copyright (C) 2010
+ * the Initial Developer. All Rights Reserved.
+ *
+ * Contributor(s):
+ *
+ * Alternatively, the contents of this file may be used under the terms of
+ * either the GNU General Public License Version 2 or later (the "GPL"), or
+ * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
+ * in which case the provisions of the GPL or the LGPL are applicable instead
+ * of those above. If you wish to allow use of your version of this file only
+ * under the terms of either the GPL or the LGPL, and not to allow others to
+ * use your version of this file under the terms of the MPL, indicate your
+ * decision by deleting the provisions above and replace them with the notice
+ * and other provisions required by the GPL or the LGPL. If you do not delete
+ * the provisions above, a recipient may use your version of this file under
+ * the terms of any one of the MPL, the GPL or the LGPL.
+ *
+ * ***** END LICENSE BLOCK ***** */
+
+#include <stdlib.h>
+
+#include <guacamole/guacio.h>
+#include <guacamole/client.h>
+#include <guacamole/log.h>
+#include <guacamole/thread.h>
+
+#include "client.h"
+
+void guac_client_stop(guac_client* client) {
+ client->state = STOPPING;
+}
+
+void* __guac_client_output_thread(void* data) {
+
+ guac_client* client = (guac_client*) data;
+ GUACIO* io = client->io;
+
+ guac_timestamp last_ping_timestamp = guac_current_timestamp();
+
+ /* Guacamole client output loop */
+ while (client->state == RUNNING) {
+
+ /* Occasionally ping client with repeat of last sync */
+ guac_timestamp timestamp = guac_current_timestamp();
+ if (timestamp - last_ping_timestamp > GUAC_SYNC_FREQUENCY) {
+ last_ping_timestamp = timestamp;
+ if (
+ guac_send_sync(io, client->last_sent_timestamp)
+ || guac_flush(io)
+ ) {
+ guac_client_stop(client);
+ return NULL;
+ }
+ }
+
+ /* Handle server messages */
+ if (client->handle_messages) {
+
+ /* Get previous GUACIO state */
+ int last_total_written = io->total_written;
+
+ /* Only handle messages if synced within threshold */
+ if (client->last_sent_timestamp - client->last_received_timestamp
+ < GUAC_SYNC_THRESHOLD) {
+
+ int retval = client->handle_messages(client);
+ if (retval) {
+ guac_log_error("Error handling server messages");
+ guac_client_stop(client);
+ return NULL;
+ }
+
+ /* If data was written during message handling */
+ if (io->total_written != last_total_written) {
+
+ /* Sleep as necessary */
+ guac_sleep(GUAC_SERVER_MESSAGE_HANDLE_FREQUENCY);
+
+ /* Send sync instruction */
+ client->last_sent_timestamp = guac_current_timestamp();
+ if (guac_send_sync(io, client->last_sent_timestamp)) {
+ guac_client_stop(client);
+ return NULL;
+ }
+
+ }
+
+ if (guac_flush(io)) {
+ guac_client_stop(client);
+ return NULL;
+ }
+
+ }
+
+ /* If sync threshold exceeded, don't spin waiting for resync */
+ else
+ guac_sleep(GUAC_SERVER_MESSAGE_HANDLE_FREQUENCY);
+
+ }
+
+ /* If no message handler, just sleep until next sync ping */
+ else
+ guac_sleep(GUAC_SYNC_FREQUENCY);
+
+ } /* End of output loop */
+
+ guac_client_stop(client);
+ return NULL;
+
+}
+
+void* __guac_client_input_thread(void* data) {
+
+ guac_client* client = (guac_client*) data;
+ GUACIO* io = client->io;
+
+ guac_instruction instruction;
+
+ /* Guacamole client input loop */
+ while (client->state == RUNNING && guac_read_instruction(io, &instruction) > 0) {
+
+ /* Call handler, stop on error */
+ if (guac_client_handle_instruction(client, &instruction) < 0) {
+ guac_free_instruction_data(&instruction);
+ break;
+ }
+
+ /* Free allocate instruction data */
+ guac_free_instruction_data(&instruction);
+
+ }
+
+ guac_client_stop(client);
+ return NULL;
+
+}
+
+int guac_start_client(guac_client* client) {
+
+ guac_thread input_thread, output_thread;
+
+ if (guac_thread_create(&output_thread, __guac_client_output_thread, (void*) client)) {
+ return -1;
+ }
+
+ if (guac_thread_create(&input_thread, __guac_client_input_thread, (void*) client)) {
+ guac_client_stop(client);
+ guac_thread_join(output_thread);
+ return -1;
+ }
+
+ /* Wait for I/O threads */
+ guac_thread_join(input_thread);
+ guac_thread_join(output_thread);
+
+ /* Done */
+ return 0;
+
+}
+
+
projects / guacd.git / commitdiff