spice: add unix address support

Teach qemu to set up a Spice server with a UNIX socket using the
following arguments -spice unix,addr=path.
Signed-off-by: NGerd Hoffmann <kraxel@redhat.com>

qemu-options.hx

@@ -953,7 +953,7 @@ DEF("spice", HAS_ARG, QEMU_OPTION_spice,
     "-spice [port=port][,tls-port=secured-port][,x509-dir=<dir>]\n"
     "       [,x509-key-file=<file>][,x509-key-password=<file>]\n"
     "       [,x509-cert-file=<file>][,x509-cacert-file=<file>]\n"
-    "       [,x509-dh-key-file=<file>][,addr=addr][,ipv4|ipv6]\n"
+    "       [,x509-dh-key-file=<file>][,addr=addr][,ipv4|ipv6|unix]\n"
     "       [,tls-ciphers=<list>]\n"
     "       [,tls-channel=[main|display|cursor|inputs|record|playback]]\n"
     "       [,plaintext-channel=[main|display|cursor|inputs|record|playback]]\n"
@@ -982,6 +982,7 @@ Set the IP address spice is listening on.  Default is any address.
 
 @item ipv4
 @item ipv6
+@item unix
 Force using the specified IP version.
 
 @item password=<secret>

ui/spice-core.c

@@ -436,6 +436,11 @@ static QemuOptsList qemu_spice_opts = {
         },{
             .name = "ipv6",
             .type = QEMU_OPT_BOOL,
+#ifdef SPICE_ADDR_FLAG_UNIX_ONLY
+        },{
+            .name = "unix",
+            .type = QEMU_OPT_BOOL,
+#endif
         },{
             .name = "password",
             .type = QEMU_OPT_STRING,
@@ -708,6 +713,10 @@ void qemu_spice_init(void)
         addr_flags |= SPICE_ADDR_FLAG_IPV4_ONLY;
     } else if (qemu_opt_get_bool(opts, "ipv6", 0)) {
         addr_flags |= SPICE_ADDR_FLAG_IPV6_ONLY;
+#ifdef SPICE_ADDR_FLAG_UNIX_ONLY
+    } else if (qemu_opt_get_bool(opts, "unix", 0)) {
+        addr_flags |= SPICE_ADDR_FLAG_UNIX_ONLY;
+#endif
     }
 
     spice_server = spice_server_new();