use unix domain socket for xrdp-X11rdp connection

sesman/sesman.ini

@@ -29,6 +29,7 @@ param1=-bs
 param2=-ac
 param3=-nolisten
 param4=tcp
+param5=-uds
 
 [Xvnc]
 param1=-bs

xrdp/xrdp_mm.c

@@ -373,6 +373,7 @@ xrdp_mm_setup_mod2(struct xrdp_mm* self)
   int rv;
   int key_flags;
   int device_flags;
+  int use_uds;
 
   g_memset(text,0,sizeof(char) * 256);
   rv = 1;
@@ -396,7 +397,22 @@ xrdp_mm_setup_mod2(struct xrdp_mm* self)
       }
       else if (self->code == 10) /* X11rdp */
       {
-        g_snprintf(text, 255, "%d", 6200 + self->display);
+        use_uds = 1;
+        if (xrdp_mm_get_value(self, "ip", text, 255) == 0)
+        {
+          if (g_strcmp(text, "127.0.0.1") != 0)
+          {
+            use_uds = 0;
+          }
+        }
+        if (use_uds)
+        {
+          g_snprintf(text, 255, "/tmp/.xrdp/xrdp_display_%d", self->display);
+        }
+        else
+        {
+          g_snprintf(text, 255, "%d", 6200 + self->display);
+        }
       }
       else
       {

xup/xup.c

@@ -130,6 +130,7 @@ lib_mod_connect(struct mod* mod)
   int len;
   int i;
   int index;
+  int use_uds;
   struct stream* s;
   char con_port[256];
 
@@ -156,15 +157,34 @@ lib_mod_connect(struct mod* mod)
   }
   make_stream(s);
   g_sprintf(con_port, "%s", mod->port);
+  use_uds = 0;
+  if (con_port[0] == '/')
+  {
+    use_uds = 1;
+  }
   mod->sck_closed = 0;
   i = 0;
   while (1)
   {
-    mod->sck = g_tcp_socket();
+    if (use_uds)
+    {
+      mod->sck = g_tcp_local_socket();
+    }
+    else
+    {
+      mod->sck = g_tcp_socket();
+    }
     g_tcp_set_non_blocking(mod->sck);
     g_tcp_set_no_delay(mod->sck);
     mod->server_msg(mod, "connecting...", 0);
-    error = g_tcp_connect(mod->sck, mod->ip, con_port);
+    if (use_uds)
+    {
+      error = g_tcp_local_connect(mod->sck, con_port);
+    }
+    else
+    {
+      error = g_tcp_connect(mod->sck, mod->ip, con_port);
+    }
     if (error == -1)
     {
       if (g_tcp_last_error_would_block(mod->sck))