Add SPICE support to add_client monitor command

With the acceptance of some new APIs to libspice-server.so it
is possible to add support for SPICE to the 'add_client'
monitor command, bringing parity with VNC. Since SPICE can
use TLS or plain connections, the command also gains a new
'tls' parameter to specify whether TLS should be attempted
on the injected client sockets.

This new feature is only enabled if building against a
libspice-server >= 0.10.1

* qmp-commands.hx: Add 'tls' parameter & missing doc for
  'skipauth' parameter
* monitor.c: Wire up SPICE for 'add_client' command
* ui/qemu-spice.h, ui/spice-core.c: Add qemu_spice_display_add_client
  API to wire up from monitor

[1] http://cgit.freedesktop.org/spice/spice/commit/server/spice.h?id=d55b68b6b44f2499278fa860fb47ff22f5011faa
    http://cgit.freedesktop.org/spice/spice/commit/server/spice.h?id=bd07dde530d9504e1cfe7ed5837fc00c26f36716

Changes in v3:
 - Added 'optional' flag to new parameters documented
 - Added no-op impl of qemu_spice_display_add_client when
   SPICE is disabled during build

Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>

2 files changed, 20 insertions, 0 deletions

diff --git a/ui/qemu-spice.h b/ui/qemu-spice.h
index c35b29c..680206a 100644
--- a/ui/qemu-spice.h
+++ b/ui/qemu-spice.h
@@ -33,6 +33,7 @@ void qemu_spice_init(void);
 void qemu_spice_input_init(void);
 void qemu_spice_audio_init(void);
 void qemu_spice_display_init(DisplayState *ds);
+int qemu_spice_display_add_client(int csock, int skipauth, int tls);
 int qemu_spice_add_interface(SpiceBaseInstance *sin);
 int qemu_spice_set_passwd(const char *passwd,
                           bool fail_if_connected, bool disconnect_if_connected);
@@ -68,6 +69,12 @@ static inline int qemu_spice_migrate_info(const char *h, int p, int t,
     return -1;
 }
 
+static inline int qemu_spice_display_add_client(int csock, int skipauth,
+                                                int tls)
+{
+    return -1;
+}
+
 #endif /* CONFIG_SPICE */
 
 #endif /* QEMU_SPICE_H */
diff --git a/ui/spice-core.c b/ui/spice-core.c
index b4629f8..05cb745 100644
--- a/ui/spice-core.c
+++ b/ui/spice-core.c
@@ -747,6 +747,19 @@ int qemu_spice_set_pw_expire(time_t expires)
     return qemu_spice_set_ticket(false, false);
 }
 
+int qemu_spice_display_add_client(int csock, int skipauth, int tls)
+{
+#if SPICE_SERVER_VERSION >= 0x000a01
+    if (tls) {
+        return spice_server_add_ssl_client(spice_server, csock, skipauth);
+    } else {
+        return spice_server_add_client(spice_server, csock, skipauth);
+    }
+#else
+    return -1;
+#endif
+}
+
 static void spice_register_config(void)
 {
     qemu_add_opts(&qemu_spice_opts);