Implement file download.

src/protocols/rdp/client.c

@@ -308,6 +308,7 @@ BOOL rdp_freerdp_post_connect(freerdp* instance) {
     client->file_handler = rdp_guac_client_file_handler;
     client->blob_handler = rdp_guac_client_blob_handler;
     client->end_handler = rdp_guac_client_end_handler;
+    client->ack_handler = rdp_guac_client_ack_handler;
 
     return TRUE;
 

src/protocols/rdp/client.h

@@ -207,6 +207,23 @@ typedef struct rdp_freerdp_context {
 
 } rdp_freerdp_context;
 
+/**
+ * The transfer status of a file being downloaded.
+ */
+typedef struct guac_rdp_download_status {
+
+    /**
+     * The file ID of the file being downloaded.
+     */
+    int file_id;
+
+    /**
+     * The current position within the file.
+     */
+    uint64_t offset;
+
+} guac_rdp_download_status;
+
 /**
  * Given the coordinates and dimensions of a rectangle, clips the rectangle to be
  * within the clipping bounds of the client data, if clipping is active.

src/protocols/rdp/guac_handlers.c

@@ -639,3 +639,60 @@ int rdp_guac_client_end_handler(guac_client* client, guac_stream* stream) {
     return 0;
 }
 
+int rdp_guac_client_ack_handler(guac_client* client, guac_stream* stream,
+        char* message, guac_protocol_status status) {
+
+    /* Get status */
+    guac_rdp_download_status* download =
+        (guac_rdp_download_status*) stream->data;
+
+    /* Get filesystem, return error if no filesystem */
+    guac_rdp_fs* fs = ((rdp_guac_client_data*) client->data)->filesystem;
+    if (fs == NULL) {
+        guac_protocol_send_ack(client->socket, stream, "FAIL (NO FS)",
+                GUAC_PROTOCOL_STATUS_INTERNAL_ERROR);
+        guac_socket_flush(client->socket);
+        return 0;
+    }
+
+    /* If successful, read data */
+    if (status == GUAC_PROTOCOL_STATUS_SUCCESS) {
+
+        /* Attempt read into buffer */
+        char buffer[4096];
+        int bytes_read = guac_rdp_fs_read(fs, download->file_id,
+                download->offset, buffer, sizeof(buffer)); 
+
+        /* If bytes read, send as blob */
+        if (bytes_read > 0) {
+            download->offset += bytes_read;
+            guac_protocol_send_blob(client->socket, stream,
+                    buffer, bytes_read);
+        }
+
+        /* If EOF, send end */
+        else if (bytes_read == 0) {
+            guac_protocol_send_end(client->socket, stream);
+            guac_client_free_stream(client, stream);
+        }
+
+        /* Otherwise, fail stream */
+        else {
+            guac_client_log_error(client, "Error reading file for download");
+            guac_protocol_send_end(client->socket, stream);
+            guac_client_free_stream(client, stream);
+        }
+
+        guac_socket_flush(client->socket);
+
+    }
+
+    /* Otherwise, return stream to client */
+    else
+        guac_client_free_stream(client, stream);
+
+    return 0;
+
+
+}
+

src/protocols/rdp/guac_handlers.h

@@ -73,5 +73,8 @@ int rdp_guac_client_blob_handler(guac_client* client, guac_stream* stream,
 
 int rdp_guac_client_end_handler(guac_client* client, guac_stream* stream);
 
+int rdp_guac_client_ack_handler(guac_client* client, guac_stream* stream,
+        char* message, guac_protocol_status status);
+
 #endif
 

src/protocols/rdp/guac_rdpdr/rdpdr_fs_messages.c

@@ -226,11 +226,23 @@ void guac_rdpdr_fs_process_close(guac_rdpdr_device* device,
         int i;
         char c;
 
-        /* Get client */
+        /* Get client and stream */
         guac_client* client = device->rdpdr->client;
 
-        /* Allocate stream */
+        int file_id = guac_rdp_fs_open((guac_rdp_fs*) device->data,
+                file->absolute_path, ACCESS_FILE_READ_DATA, 0,
+                DISP_FILE_OPEN, 0);
+
+        /* If file opened successfully, start stream */
+        if (file_id >= 0) {
+
+            guac_rdp_download_status* status;
+
+            /* Associate stream with transfer status */
             guac_stream* stream = guac_client_alloc_stream(client);
+            stream->data = status = malloc(sizeof(guac_rdp_download_status));
+            status->file_id = file_id;
+            status->offset = 0;
 
             /* Get basename from absolute path */
             char* basename = file->absolute_path;
@@ -244,12 +256,20 @@ void guac_rdpdr_fs_process_close(guac_rdpdr_device* device,
 
             } while (c != '\0');
 
-        GUAC_RDP_DEBUG(2, "Initiating download of \"%s\"", file->absolute_path);
+            GUAC_RDP_DEBUG(2, "Initiating download of \"%s\"",
+                    file->absolute_path);
+
+            /* Begin stream */
             guac_protocol_send_file(client->socket, stream,
                     "application/octet-stream", basename);
             guac_socket_flush(client->socket);
 
         }
+        else
+            guac_client_log_error(client, "Unable to download \"%s\"",
+                    file->absolute_path);
+
+    } /* end if download */
 
     /* Close file */
     guac_rdp_fs_close((guac_rdp_fs*) device->data, file_id);