GUACAMOLE-600: Add support for setting the FreeRDP TcpAckTimeout setting.

src/protocols/rdp/settings.c

@@ -54,6 +54,7 @@ const char fips_nla_mode_warning[] = (
 const char* GUAC_RDP_CLIENT_ARGS[] = {
     "hostname",
     "port",
+    "server-timeout",
     GUAC_RDP_ARGV_DOMAIN,
     GUAC_RDP_ARGV_USERNAME,
     GUAC_RDP_ARGV_PASSWORD,
@@ -159,6 +160,11 @@ enum RDP_ARGS_IDX {
      */
     IDX_PORT,
 
+    /**
+     * The amount of time to wait for the server to respond, in seconds.
+     */
+    IDX_SERVER_TIMEOUT,
+
     /**
      * The domain of the user logging in.
      */
@@ -780,6 +786,11 @@ guac_rdp_settings* guac_rdp_parse_args(guac_user* user,
         guac_user_parse_args_int(user, GUAC_RDP_CLIENT_ARGS, argv, IDX_PORT,
                 settings->security_mode == GUAC_SECURITY_VMCONNECT ? RDP_DEFAULT_VMCONNECT_PORT : RDP_DEFAULT_PORT);
 
+    /* Look for timeout settings and parse or set defaults. */
+    settings->server_timeout =
+        guac_user_parse_args_int(user, GUAC_RDP_CLIENT_ARGS, argv,
+                IDX_SERVER_TIMEOUT, RDP_DEFAULT_SERVER_TIMEOUT);
+
     guac_user_log(user, GUAC_LOG_DEBUG,
             "User resolution is %ix%i at %i DPI",
             user->info.optimal_width,
@@ -1424,6 +1435,7 @@ void guac_rdp_push_settings(guac_client* client,
     /* Connection */
     rdp_settings->ServerHostname = guac_strdup(guac_settings->hostname);
     rdp_settings->ServerPort = guac_settings->port;
+    rdp_settings->TcpAckTimeout = guac_settings->server_timeout * 1000;
 
     /* Session */
     rdp_settings->ColorDepth = guac_settings->color_depth;

src/protocols/rdp/settings.h

@@ -33,6 +33,11 @@
  */
 #define RDP_CLIENT_HOSTNAME_SIZE 32
 
+/**
+ * The default server response timeout, in seconds.
+ */
+#define RDP_DEFAULT_SERVER_TIMEOUT 10
+
 /**
  * The default RDP port.
  */
@@ -156,6 +161,11 @@ typedef struct guac_rdp_settings {
      */
     int port;
 
+    /**
+     * The timeout, in seconds, to wait for the remote host to respond.
+     */
+    int server_timeout;
+
     /**
      * The domain of the user logging in.
      */