GUACAMOLE-269: Add basic support for sending TTY mode encoding.

src/protocols/ssh/Makefile.am

@@ -38,6 +38,7 @@ noinst_HEADERS =                \
     settings.h                  \
     sftp.h                      \
     ssh.h                       \
+    ttymode.h                   \
     user.h
 
 # Add agent sources if enabled

src/protocols/ssh/ssh.c

@@ -26,6 +26,7 @@
 #include "sftp.h"
 #include "ssh.h"
 #include "terminal/terminal.h"
+#include "ttymode.h"
 
 #ifdef ENABLE_SSH_AGENT
 #include "ssh_agent.h"
@@ -297,8 +298,8 @@ void* ssh_client_thread(void* data) {
     }
 
     /* Request PTY */
-    if (libssh2_channel_request_pty_ex(ssh_client->term_channel, "linux", sizeof("linux")-1, NULL, 0,
-            ssh_client->term->term_width, ssh_client->term->term_height, 0, 0)) {
+    if (libssh2_channel_request_pty_ex(ssh_client->term_channel, "linux", sizeof("linux")-1, guac_tty_modes,
+            sizeof(guac_tty_modes), ssh_client->term->term_width, ssh_client->term->term_height, 0, 0)) {
         guac_client_abort(client, GUAC_PROTOCOL_STATUS_UPSTREAM_ERROR, "Unable to allocate PTY.");
         return NULL;
     }

src/protocols/ssh/ttymode.h

@@ -0,0 +1,36 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (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.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+#ifndef GUAC_SSH_TTYMODE_H
+#define GUAC_SSH_TTYMODE_H
+
+#include "config.h"
+
+#define TTY_OP_END 0
+#define TTY_OP_VERASE 3
+
+#define GUAC_SSH_TERM_DEFAULT_BACKSPACE 127
+
+char guac_tty_modes[] = {
+    TTY_OP_VERASE,
+    0, 0, 0, GUAC_SSH_TERM_DEFAULT_BACKSPACE,
+    TTY_OP_END
+};
+
+#endif