GUACAMOLE-381: Disable outbound transfers from terminal protocols if "disable-copy" is set.

src/protocols/kubernetes/kubernetes.c

@@ -237,7 +237,7 @@ void* guac_kubernetes_client_thread(void* data) {
 
     /* Create terminal */
     kubernetes_client->term = guac_terminal_create(client,
-            kubernetes_client->clipboard,
+            kubernetes_client->clipboard, settings->disable_copy,
             settings->max_scrollback, settings->font_name, settings->font_size,
             settings->resolution, settings->width, settings->height,
             settings->color_scheme, settings->backspace);

src/protocols/ssh/ssh.c

@@ -207,9 +207,10 @@ void* ssh_client_thread(void* data) {
 
     /* Create terminal */
     ssh_client->term = guac_terminal_create(client, ssh_client->clipboard,
-            settings->max_scrollback, settings->font_name, settings->font_size,
+            settings->disable_copy, settings->max_scrollback,
-            settings->resolution, settings->width, settings->height,
+            settings->font_name, settings->font_size, settings->resolution,
-            settings->color_scheme, settings->backspace);
+            settings->width, settings->height, settings->color_scheme,
+            settings->backspace);
 
     /* Fail if terminal init failed */
     if (ssh_client->term == NULL) {

src/protocols/telnet/telnet.c

@@ -568,7 +568,7 @@ void* guac_telnet_client_thread(void* data) {
 
     /* Create terminal */
     telnet_client->term = guac_terminal_create(client,
-            telnet_client->clipboard,
+            telnet_client->clipboard, settings->disable_copy,
             settings->max_scrollback, settings->font_name, settings->font_size,
             settings->resolution, settings->width, settings->height,
             settings->color_scheme, settings->backspace);

src/terminal/select.c

@@ -375,8 +375,10 @@ void guac_terminal_select_end(guac_terminal* terminal) {
     }
 
     /* Send data */
+    if (!terminal->disable_copy) {
         guac_common_clipboard_send(terminal->clipboard, client);
         guac_socket_flush(socket);
+    }
 
     guac_terminal_notify(terminal);
 

src/terminal/terminal.c

@@ -306,8 +306,8 @@ void* guac_terminal_thread(void* data) {
 }
 
 guac_terminal* guac_terminal_create(guac_client* client,
-        guac_common_clipboard* clipboard, int max_scrollback,
+        guac_common_clipboard* clipboard, bool disable_copy,
-        const char* font_name, int font_size, int dpi,
+        int max_scrollback, const char* font_name, int font_size, int dpi,
         int width, int height, const char* color_scheme,
         const int backspace) {
 
@@ -404,6 +404,7 @@ guac_terminal* guac_terminal_create(guac_client* client,
     term->current_attributes = default_char.attributes;
     term->default_char = default_char;
     term->clipboard = clipboard;
+    term->disable_copy = disable_copy;
 
     /* Calculate character size */
     int rows    = height / term->display->char_height;

src/terminal/terminal/terminal.h

@@ -511,6 +511,14 @@ struct guac_terminal {
      */
     char backspace;
 
+    /**
+     * Whether copying from the terminal clipboard should be blocked. If set,
+     * the contents of the terminal can still be copied, but will be usable
+     * only within the terminal itself. The clipboard contents will not be
+     * automatically streamed to the client.
+     */
+    bool disable_copy;
+
 };
 
 /**
@@ -533,6 +541,12 @@ struct guac_terminal {
  *     clipboard instructions. This clipboard will not be automatically
  *     freed when this terminal is freed.
  *
+ * @param disable_copy
+ *     Whether copying from the terminal clipboard should be blocked. If set,
+ *     the contents of the terminal can still be copied, but will be usable
+ *     only within the terminal itself. The clipboard contents will not be
+ *     automatically streamed to the client.
+ *
  * @param max_scrollback
  *     The maximum number of rows to allow within the scrollback buffer. The
  *     user may still alter the size of the scrollback buffer using terminal
@@ -575,8 +589,8 @@ struct guac_terminal {
  *     which renders all text to the given client.
  */
 guac_terminal* guac_terminal_create(guac_client* client,
-        guac_common_clipboard* clipboard, int max_scrollback,
+        guac_common_clipboard* clipboard, bool disable_copy,
-        const char* font_name, int font_size, int dpi,
+        int max_scrollback, const char* font_name, int font_size, int dpi,
         int width, int height, const char* color_scheme,
         const int backspace);