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ui/dbus: add chardev backend & interface
Add a new chardev backend which allows D-Bus client to handle the chardev stream & events. Signed-off-by: Marc-André Lureau <[email protected]> Acked-by: Gerd Hoffmann <[email protected]>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,296 @@ | ||
| /* | ||
| * QEMU DBus display | ||
| * | ||
| * Copyright (c) 2021 Marc-André Lureau <[email protected]> | ||
| * | ||
| * Permission is hereby granted, free of charge, to any person obtaining a copy | ||
| * of this software and associated documentation files (the "Software"), to deal | ||
| * in the Software without restriction, including without limitation the rights | ||
| * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell | ||
| * copies of the Software, and to permit persons to whom the Software is | ||
| * furnished to do so, subject to the following conditions: | ||
| * | ||
| * The above copyright notice and this permission notice shall be included in | ||
| * all copies or substantial portions of the Software. | ||
| * | ||
| * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | ||
| * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | ||
| * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL | ||
| * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | ||
| * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, | ||
| * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN | ||
| * THE SOFTWARE. | ||
| */ | ||
| #include "qemu/osdep.h" | ||
| #include "trace.h" | ||
| #include "qapi/error.h" | ||
| #include "qemu/config-file.h" | ||
| #include "qemu/option.h" | ||
|
|
||
| #include <gio/gunixfdlist.h> | ||
|
|
||
| #include "dbus.h" | ||
|
|
||
| static char * | ||
| dbus_display_chardev_path(DBusChardev *chr) | ||
| { | ||
| return g_strdup_printf(DBUS_DISPLAY1_ROOT "/Chardev_%s", | ||
| CHARDEV(chr)->label); | ||
| } | ||
|
|
||
| static void | ||
| dbus_display_chardev_export(DBusDisplay *dpy, DBusChardev *chr) | ||
| { | ||
| g_autoptr(GDBusObjectSkeleton) sk = NULL; | ||
| g_autofree char *path = dbus_display_chardev_path(chr); | ||
|
|
||
| if (chr->exported) { | ||
| return; | ||
| } | ||
|
|
||
| sk = g_dbus_object_skeleton_new(path); | ||
| g_dbus_object_skeleton_add_interface( | ||
| sk, G_DBUS_INTERFACE_SKELETON(chr->iface)); | ||
| g_dbus_object_manager_server_export(dpy->server, sk); | ||
| chr->exported = true; | ||
| } | ||
|
|
||
| static void | ||
| dbus_display_chardev_unexport(DBusDisplay *dpy, DBusChardev *chr) | ||
| { | ||
| g_autofree char *path = dbus_display_chardev_path(chr); | ||
|
|
||
| if (!chr->exported) { | ||
| return; | ||
| } | ||
|
|
||
| g_dbus_object_manager_server_unexport(dpy->server, path); | ||
| chr->exported = false; | ||
| } | ||
|
|
||
| static int | ||
| dbus_display_chardev_foreach(Object *obj, void *data) | ||
| { | ||
| DBusDisplay *dpy = DBUS_DISPLAY(data); | ||
|
|
||
| if (!CHARDEV_IS_DBUS(obj)) { | ||
| return 0; | ||
| } | ||
|
|
||
| dbus_display_chardev_export(dpy, DBUS_CHARDEV(obj)); | ||
|
|
||
| return 0; | ||
| } | ||
|
|
||
| static void | ||
| dbus_display_on_notify(Notifier *notifier, void *data) | ||
| { | ||
| DBusDisplay *dpy = container_of(notifier, DBusDisplay, notifier); | ||
| DBusDisplayEvent *event = data; | ||
|
|
||
| switch (event->type) { | ||
| case DBUS_DISPLAY_CHARDEV_OPEN: | ||
| dbus_display_chardev_export(dpy, event->chardev); | ||
| break; | ||
| case DBUS_DISPLAY_CHARDEV_CLOSE: | ||
| dbus_display_chardev_unexport(dpy, event->chardev); | ||
| break; | ||
| } | ||
| } | ||
|
|
||
| void | ||
| dbus_chardev_init(DBusDisplay *dpy) | ||
| { | ||
| dpy->notifier.notify = dbus_display_on_notify; | ||
| dbus_display_notifier_add(&dpy->notifier); | ||
|
|
||
| object_child_foreach(container_get(object_get_root(), "/chardevs"), | ||
| dbus_display_chardev_foreach, dpy); | ||
| } | ||
|
|
||
| static gboolean | ||
| dbus_chr_register( | ||
| DBusChardev *dc, | ||
| GDBusMethodInvocation *invocation, | ||
| GUnixFDList *fd_list, | ||
| GVariant *arg_stream, | ||
| QemuDBusDisplay1Chardev *object) | ||
| { | ||
| g_autoptr(GError) err = NULL; | ||
| int fd; | ||
|
|
||
| fd = g_unix_fd_list_get(fd_list, g_variant_get_handle(arg_stream), &err); | ||
| if (err) { | ||
| g_dbus_method_invocation_return_error( | ||
| invocation, | ||
| DBUS_DISPLAY_ERROR, | ||
| DBUS_DISPLAY_ERROR_FAILED, | ||
| "Couldn't get peer FD: %s", err->message); | ||
| return DBUS_METHOD_INVOCATION_HANDLED; | ||
| } | ||
|
|
||
| if (qemu_chr_add_client(CHARDEV(dc), fd) < 0) { | ||
| g_dbus_method_invocation_return_error(invocation, | ||
| DBUS_DISPLAY_ERROR, | ||
| DBUS_DISPLAY_ERROR_FAILED, | ||
| "Couldn't register FD!"); | ||
| close(fd); | ||
| return DBUS_METHOD_INVOCATION_HANDLED; | ||
| } | ||
|
|
||
| g_object_set(dc->iface, | ||
| "owner", g_dbus_method_invocation_get_sender(invocation), | ||
| NULL); | ||
|
|
||
| qemu_dbus_display1_chardev_complete_register(object, invocation, NULL); | ||
| return DBUS_METHOD_INVOCATION_HANDLED; | ||
| } | ||
|
|
||
| static gboolean | ||
| dbus_chr_send_break( | ||
| DBusChardev *dc, | ||
| GDBusMethodInvocation *invocation, | ||
| QemuDBusDisplay1Chardev *object) | ||
| { | ||
| qemu_chr_be_event(CHARDEV(dc), CHR_EVENT_BREAK); | ||
|
|
||
| qemu_dbus_display1_chardev_complete_send_break(object, invocation); | ||
| return DBUS_METHOD_INVOCATION_HANDLED; | ||
| } | ||
|
|
||
| static void | ||
| dbus_chr_open(Chardev *chr, ChardevBackend *backend, | ||
| bool *be_opened, Error **errp) | ||
| { | ||
| ERRP_GUARD(); | ||
|
|
||
| DBusChardev *dc = DBUS_CHARDEV(chr); | ||
| DBusDisplayEvent event = { | ||
| .type = DBUS_DISPLAY_CHARDEV_OPEN, | ||
| .chardev = dc, | ||
| }; | ||
| g_autoptr(ChardevBackend) be = NULL; | ||
| g_autoptr(QemuOpts) opts = NULL; | ||
|
|
||
| dc->iface = qemu_dbus_display1_chardev_skeleton_new(); | ||
| g_object_set(dc->iface, "name", backend->u.dbus.data->name, NULL); | ||
| g_object_connect(dc->iface, | ||
| "swapped-signal::handle-register", | ||
| dbus_chr_register, dc, | ||
| "swapped-signal::handle-send-break", | ||
| dbus_chr_send_break, dc, | ||
| NULL); | ||
|
|
||
| dbus_display_notify(&event); | ||
|
|
||
| be = g_new0(ChardevBackend, 1); | ||
| opts = qemu_opts_create(qemu_find_opts("chardev"), NULL, 0, &error_abort); | ||
| qemu_opt_set(opts, "server", "on", &error_abort); | ||
| qemu_opt_set(opts, "wait", "off", &error_abort); | ||
| CHARDEV_CLASS(object_class_by_name(TYPE_CHARDEV_SOCKET))->parse( | ||
| opts, be, errp); | ||
| if (*errp) { | ||
| return; | ||
| } | ||
| CHARDEV_CLASS(object_class_by_name(TYPE_CHARDEV_SOCKET))->open( | ||
| chr, be, be_opened, errp); | ||
| } | ||
|
|
||
| static void | ||
| dbus_chr_set_fe_open(Chardev *chr, int fe_open) | ||
| { | ||
| DBusChardev *dc = DBUS_CHARDEV(chr); | ||
|
|
||
| g_object_set(dc->iface, "feopened", fe_open, NULL); | ||
| } | ||
|
|
||
| static void | ||
| dbus_chr_set_echo(Chardev *chr, bool echo) | ||
| { | ||
| DBusChardev *dc = DBUS_CHARDEV(chr); | ||
|
|
||
| g_object_set(dc->iface, "echo", echo, NULL); | ||
| } | ||
|
|
||
| static void | ||
| dbus_chr_be_event(Chardev *chr, QEMUChrEvent event) | ||
| { | ||
| DBusChardev *dc = DBUS_CHARDEV(chr); | ||
| DBusChardevClass *klass = DBUS_CHARDEV_GET_CLASS(chr); | ||
|
|
||
| switch (event) { | ||
| case CHR_EVENT_CLOSED: | ||
| if (dc->iface) { | ||
| /* on finalize, iface is set to NULL */ | ||
| g_object_set(dc->iface, "owner", "", NULL); | ||
| } | ||
| break; | ||
| default: | ||
| break; | ||
| }; | ||
|
|
||
| klass->parent_chr_be_event(chr, event); | ||
| } | ||
|
|
||
| static void | ||
| dbus_chr_parse(QemuOpts *opts, ChardevBackend *backend, | ||
| Error **errp) | ||
| { | ||
| const char *name = qemu_opt_get(opts, "name"); | ||
| ChardevDBus *dbus; | ||
|
|
||
| if (name == NULL) { | ||
| error_setg(errp, "chardev: dbus: no name given"); | ||
| return; | ||
| } | ||
|
|
||
| backend->type = CHARDEV_BACKEND_KIND_DBUS; | ||
| dbus = backend->u.dbus.data = g_new0(ChardevDBus, 1); | ||
| qemu_chr_parse_common(opts, qapi_ChardevDBus_base(dbus)); | ||
| dbus->name = g_strdup(name); | ||
| } | ||
|
|
||
| static void | ||
| char_dbus_class_init(ObjectClass *oc, void *data) | ||
| { | ||
| DBusChardevClass *klass = DBUS_CHARDEV_CLASS(oc); | ||
| ChardevClass *cc = CHARDEV_CLASS(oc); | ||
|
|
||
| cc->parse = dbus_chr_parse; | ||
| cc->open = dbus_chr_open; | ||
| cc->chr_set_fe_open = dbus_chr_set_fe_open; | ||
| cc->chr_set_echo = dbus_chr_set_echo; | ||
| klass->parent_chr_be_event = cc->chr_be_event; | ||
| cc->chr_be_event = dbus_chr_be_event; | ||
| } | ||
|
|
||
| static void | ||
| char_dbus_finalize(Object *obj) | ||
| { | ||
| DBusChardev *dc = DBUS_CHARDEV(obj); | ||
| DBusDisplayEvent event = { | ||
| .type = DBUS_DISPLAY_CHARDEV_CLOSE, | ||
| .chardev = dc, | ||
| }; | ||
|
|
||
| dbus_display_notify(&event); | ||
| g_clear_object(&dc->iface); | ||
| } | ||
|
|
||
| static const TypeInfo char_dbus_type_info = { | ||
| .name = TYPE_CHARDEV_DBUS, | ||
| .parent = TYPE_CHARDEV_SOCKET, | ||
| .class_size = sizeof(DBusChardevClass), | ||
| .instance_size = sizeof(DBusChardev), | ||
| .instance_finalize = char_dbus_finalize, | ||
| .class_init = char_dbus_class_init, | ||
| }; | ||
| module_obj(TYPE_CHARDEV_DBUS); | ||
|
|
||
| static void | ||
| register_types(void) | ||
| { | ||
| type_register_static(&char_dbus_type_info); | ||
| } | ||
|
|
||
| type_init(register_types); |
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