server: add websockets support via libwebsockets

New API: spice_server_set_ws_ports

This adds an optional dependency on libwebsockets. You need to get my
patched 0.0.3 version here:
 git://people.freedesktop.org/~alon/libwebsockets

There is no qemu patches yet, to test change in reds.c the default value
of spice_ws_port to 5959 (for the default of spice-html5).

For testing there is an online client at
 http://spice-space.org/spice-html5/spice.html

Known issues:
 1. The tester (server/tests/test_display_no_ssl) gets into dropping all
  data after a few seconds, I think it's an issue with the implemented
  watches, but haven't figured it out.

 2. libwebsocket's read interface is inverted to what our code expects,
 i.e. there is no libwebsocket_read, so there is an additional copy
 involved (see RedsWebSocket). This can be fixed.

 3. Listening on a separate port. Since the headers are different, we
 could listen on the same port (first three bytes RED/GET). I don't know
 if we want to?

Todos:
 1. SSL not implemented yet. Needs some thought as to how.

 2. Serve spice-html5 when accessed as a http server. Nice to have.

1 files changed, 3 insertions, 1 deletions

diff --git a/server/tests/test_display_base.c b/server/tests/test_display_base.c
index 588e960f..9eaa5847 100644
--- a/server/tests/test_display_base.c
+++ b/server/tests/test_display_base.c
@@ -701,13 +701,14 @@ static int flush_resources(QXLInstance *qin)
     return TRUE;
 }
 
-static void client_monitors_config(QXLInstance *qin, VDAgentMonitorsConfig *monitors_config)
+static int client_monitors_config(QXLInstance *qin, VDAgentMonitorsConfig *monitors_config)
 {
     if (!monitors_config) {
         printf("%s: NULL monitors_config\n", __func__);
     } else {
         printf("%s: %d\n", __func__, monitors_config->num_of_monitors);
     }
+    return 0;
 }
 
 QXLInterface display_sif = {
@@ -815,6 +816,7 @@ Test *test_new(SpiceCoreInterface *core)
     printf("TESTER: listening on port %d (unsecure)\n", port);
     spice_server_set_port(server, port);
     spice_server_set_noauth(server);
+    spice_server_set_ws_ports(test->server, 5959, -1);
     spice_server_init(server, core);
 
     cursor_init();