GUAC-584: Simplify copy logic. Store clipboard in static 256K buffer. Convert from UTF16 properly.

src/common/guac_iconv.c

@@ -26,7 +26,7 @@
 #include <guacamole/unicode.h>
 #include <stdint.h>
 
-void guac_iconv(guac_iconv_read* reader, char** input, int in_remaining,
+int guac_iconv(guac_iconv_read* reader, char** input, int in_remaining,
                guac_iconv_write* writer, char** output, int out_remaining) {
 
     while (in_remaining > 0 && out_remaining > 0) {
@@ -47,10 +47,13 @@ void guac_iconv(guac_iconv_read* reader, char** input, int in_remaining,
 
         /* Stop if null terminator reached */
         if (value == 0)
-            break;
+            return 1;
 
     }
 
+    /* Null terminator not reached */
+    return 0;
+
 }
 
 int GUAC_READ_UTF8(char** input, int remaining) {

src/common/guac_iconv.h

@@ -53,8 +53,10 @@ typedef void guac_iconv_write(char** output, int remaining, int value);
  * @param output Pointer to the beginning of the output string.
  * @param out_remaining The number of bytes remaining after the pointer to the
  *                      output string.
+ * @return Non-zero if the NULL terminator of the input string was read and
+ *         copied into the destination string, zero otherwise.
  */
-void guac_iconv(guac_iconv_read* reader, char** input, int in_remaining,
+int guac_iconv(guac_iconv_read* reader, char** input, int in_remaining,
                guac_iconv_write* writer, char** output, int out_remaining);
 
 /**

src/protocols/rdp/client.c

@@ -655,7 +655,6 @@ int guac_client_init(guac_client* client, int argc, char** argv) {
     guac_client_data->bounded = FALSE;
     guac_client_data->mouse_button_mask = 0;
     guac_client_data->current_surface = GUAC_DEFAULT_LAYER;
-    guac_client_data->clipboard = NULL;
     guac_client_data->requested_clipboard_format = CB_FORMAT_TEXT;
     guac_client_data->audio = NULL;
     guac_client_data->filesystem = NULL;

src/protocols/rdp/client.h

@@ -70,6 +70,11 @@
  */
 #define GUAC_RDP_REASONABLE_AREA (800*600)
 
+/**
+ * The maximum number of bytes to allow within the clipboard.
+ */
+#define GUAC_RDP_CLIPBOARD_MAX_LENGTH 262144
+
 /**
  * Client data that will remain accessible through the guac_client.
  * This should generally include data commonly used by Guacamole handlers.
@@ -166,9 +171,9 @@ typedef struct rdp_guac_client_data {
     guac_rdp_keysym_state_map keysym_state;
 
     /**
-     * The current text (NOT Unicode) clipboard contents.
+     * The current clipboard contents, in UTF-8.
      */
-    char* clipboard;
+    char clipboard[GUAC_RDP_CLIPBOARD_MAX_LENGTH];
 
     /**
      * The format of the clipboard which was requested. Data received from

src/protocols/rdp/guac_handlers.c

@@ -462,8 +462,8 @@ int rdp_guac_client_key_handler(guac_client* client, int keysym, int pressed) {
 
 int rdp_guac_client_clipboard_handler(guac_client* client, char* data) {
 
-    rdpChannels* channels = 
-        ((rdp_guac_client_data*) client->data)->rdp_inst->context->channels;
+    rdp_guac_client_data* client_data = (rdp_guac_client_data*) client->data;
+    rdpChannels* channels = client_data->rdp_inst->context->channels;
 
     RDP_CB_FORMAT_LIST_EVENT* format_list =
         (RDP_CB_FORMAT_LIST_EVENT*) freerdp_event_new(
@@ -471,11 +471,8 @@ int rdp_guac_client_clipboard_handler(guac_client* client, char* data) {
             CliprdrChannel_FormatList,
             NULL, NULL);
 
-    /* Free existing data */
-    free(((rdp_guac_client_data*) client->data)->clipboard);
-
     /* Store data in client */
-    ((rdp_guac_client_data*) client->data)->clipboard = strdup(data);
+    strncpy(client_data->clipboard, data, GUAC_RDP_CLIPBOARD_MAX_LENGTH);
 
     /* Notify server that text data is now available */
     format_list->formats = (UINT32*) malloc(sizeof(UINT32));

src/protocols/rdp/rdp_cliprdr.c

@@ -24,7 +24,7 @@
 
 #include "client.h"
 #include "rdp_cliprdr.h"
-#include "unicode.h"
+#include "guac_iconv.h"
 
 #include <freerdp/channels/channels.h>
 #include <freerdp/freerdp.h>
@@ -212,76 +212,26 @@ void guac_rdp_process_cb_data_request(guac_client* client,
 
 }
 
-static void __guac_rdp_clipboard_send_iso8859_1(guac_client* client,
-        RDP_CB_DATA_RESPONSE_EVENT* event) {
-
-    rdp_guac_client_data* client_data = (rdp_guac_client_data*) client->data;
-
-    /* Ensure data is large enough and has null terminator */
-    if (event->size < 1 || event->data[event->size - 1] != '\0') {
-        guac_client_log_error(client,
-                "Clipboard data missing null terminator");
-        return;
-    }
-
-    /* Free existing data */
-    free(client_data->clipboard);
-
-    /* Store clipboard data */
-    client_data->clipboard = strdup((char*) event->data);
-
-    /* Send clipboard data */
-    guac_protocol_send_clipboard(client->socket, client_data->clipboard);
-
-}
-
-static void __guac_rdp_clipboard_send_utf16(guac_client* client,
-        RDP_CB_DATA_RESPONSE_EVENT* event) {
-
-    rdp_guac_client_data* client_data = (rdp_guac_client_data*) client->data;
-    int output_length;
-
-    /* Ensure data is large enough and has null terminator */
-    if (event->size < 2
-        || event->data[event->size - 2] != '\0'
-        || event->data[event->size - 1] != '\0') {
-        guac_client_log_error(client,
-                "Clipboard data missing null terminator");
-        return;
-    }
-
-    /* Free existing data */
-    free(client_data->clipboard);
-
-    /* Store clipboard data */
-    output_length = event->size * 3;
-    client_data->clipboard = malloc(output_length);
-    guac_rdp_utf16_to_utf8(event->data, event->size/2,
-            client_data->clipboard, output_length);
-
-    /* Send clipboard data */
-    guac_protocol_send_clipboard(client->socket, client_data->clipboard);
-
-}
-
 void guac_rdp_process_cb_data_response(guac_client* client,
         RDP_CB_DATA_RESPONSE_EVENT* event) {
 
     rdp_guac_client_data* client_data = (rdp_guac_client_data*) client->data;
 
-    /* Convert to UTF-8 based on format */
+    guac_iconv_read* reader;
+    char* input = (char*) event->data;
+    char* output = client_data->clipboard;
+
+    /* Find correct source encoding */
     switch (client_data->requested_clipboard_format) {
 
         /* Non-Unicode */
         case CB_FORMAT_TEXT:
-            guac_client_log_info(client, "STUB: Copy non-unicode");
-            __guac_rdp_clipboard_send_iso8859_1(client, event);
+            reader = GUAC_READ_UTF8;
             break;
 
         /* Unicode (UTF-16) */
         case CB_FORMAT_UNICODETEXT:
-            guac_client_log_info(client, "STUB: Copy unicode");
-            __guac_rdp_clipboard_send_utf16(client, event);
+            reader = GUAC_READ_UTF16;
             break;
 
         default:
@@ -292,5 +242,10 @@ void guac_rdp_process_cb_data_response(guac_client* client,
 
     }
 
+    /* Convert send clipboard data */
+    if (guac_iconv(reader, &input, event->size,
+            GUAC_WRITE_UTF8, &output, GUAC_RDP_CLIPBOARD_MAX_LENGTH))
+        guac_protocol_send_clipboard(client->socket, client_data->clipboard);
+
 }