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1 | /* | |
2 | * QEMU DBus display | |
3 | * | |
4 | * Copyright (c) 2021 Marc-André Lureau <marcandre.lureau@redhat.com> | |
5 | * | |
6 | * Permission is hereby granted, free of charge, to any person obtaining a copy | |
7 | * of this software and associated documentation files (the "Software"), to deal | |
8 | * in the Software without restriction, including without limitation the rights | |
9 | * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell | |
10 | * copies of the Software, and to permit persons to whom the Software is | |
11 | * furnished to do so, subject to the following conditions: | |
12 | * | |
13 | * The above copyright notice and this permission notice shall be included in | |
14 | * all copies or substantial portions of the Software. | |
15 | * | |
16 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | |
17 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
18 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL | |
19 | * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | |
20 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, | |
21 | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN | |
22 | * THE SOFTWARE. | |
23 | */ | |
24 | #include "qemu/osdep.h" | |
25 | #include "trace.h" | |
26 | #include "qapi/error.h" | |
27 | #include "qemu/config-file.h" | |
28 | #include "qemu/option.h" | |
29 | ||
30 | #include <gio/gunixfdlist.h> | |
31 | ||
32 | #include "dbus.h" | |
33 | ||
34 | static char * | |
35 | dbus_display_chardev_path(DBusChardev *chr) | |
36 | { | |
37 | return g_strdup_printf(DBUS_DISPLAY1_ROOT "/Chardev_%s", | |
38 | CHARDEV(chr)->label); | |
39 | } | |
40 | ||
41 | static void | |
42 | dbus_display_chardev_export(DBusDisplay *dpy, DBusChardev *chr) | |
43 | { | |
44 | g_autoptr(GDBusObjectSkeleton) sk = NULL; | |
45 | g_autofree char *path = dbus_display_chardev_path(chr); | |
46 | ||
47 | if (chr->exported) { | |
48 | return; | |
49 | } | |
50 | ||
51 | sk = g_dbus_object_skeleton_new(path); | |
52 | g_dbus_object_skeleton_add_interface( | |
53 | sk, G_DBUS_INTERFACE_SKELETON(chr->iface)); | |
54 | g_dbus_object_manager_server_export(dpy->server, sk); | |
55 | chr->exported = true; | |
56 | } | |
57 | ||
58 | static void | |
59 | dbus_display_chardev_unexport(DBusDisplay *dpy, DBusChardev *chr) | |
60 | { | |
61 | g_autofree char *path = dbus_display_chardev_path(chr); | |
62 | ||
63 | if (!chr->exported) { | |
64 | return; | |
65 | } | |
66 | ||
67 | g_dbus_object_manager_server_unexport(dpy->server, path); | |
68 | chr->exported = false; | |
69 | } | |
70 | ||
71 | static int | |
72 | dbus_display_chardev_foreach(Object *obj, void *data) | |
73 | { | |
74 | DBusDisplay *dpy = DBUS_DISPLAY(data); | |
75 | ||
76 | if (!CHARDEV_IS_DBUS(obj)) { | |
77 | return 0; | |
78 | } | |
79 | ||
80 | dbus_display_chardev_export(dpy, DBUS_CHARDEV(obj)); | |
81 | ||
82 | return 0; | |
83 | } | |
84 | ||
85 | static void | |
86 | dbus_display_on_notify(Notifier *notifier, void *data) | |
87 | { | |
88 | DBusDisplay *dpy = container_of(notifier, DBusDisplay, notifier); | |
89 | DBusDisplayEvent *event = data; | |
90 | ||
91 | switch (event->type) { | |
92 | case DBUS_DISPLAY_CHARDEV_OPEN: | |
93 | dbus_display_chardev_export(dpy, event->chardev); | |
94 | break; | |
95 | case DBUS_DISPLAY_CHARDEV_CLOSE: | |
96 | dbus_display_chardev_unexport(dpy, event->chardev); | |
97 | break; | |
98 | } | |
99 | } | |
100 | ||
101 | void | |
102 | dbus_chardev_init(DBusDisplay *dpy) | |
103 | { | |
104 | dpy->notifier.notify = dbus_display_on_notify; | |
105 | dbus_display_notifier_add(&dpy->notifier); | |
106 | ||
107 | object_child_foreach(container_get(object_get_root(), "/chardevs"), | |
108 | dbus_display_chardev_foreach, dpy); | |
109 | } | |
110 | ||
111 | static gboolean | |
112 | dbus_chr_register( | |
113 | DBusChardev *dc, | |
114 | GDBusMethodInvocation *invocation, | |
115 | GUnixFDList *fd_list, | |
116 | GVariant *arg_stream, | |
117 | QemuDBusDisplay1Chardev *object) | |
118 | { | |
119 | g_autoptr(GError) err = NULL; | |
120 | int fd; | |
121 | ||
122 | fd = g_unix_fd_list_get(fd_list, g_variant_get_handle(arg_stream), &err); | |
123 | if (err) { | |
124 | g_dbus_method_invocation_return_error( | |
125 | invocation, | |
126 | DBUS_DISPLAY_ERROR, | |
127 | DBUS_DISPLAY_ERROR_FAILED, | |
128 | "Couldn't get peer FD: %s", err->message); | |
129 | return DBUS_METHOD_INVOCATION_HANDLED; | |
130 | } | |
131 | ||
132 | if (qemu_chr_add_client(CHARDEV(dc), fd) < 0) { | |
133 | g_dbus_method_invocation_return_error(invocation, | |
134 | DBUS_DISPLAY_ERROR, | |
135 | DBUS_DISPLAY_ERROR_FAILED, | |
136 | "Couldn't register FD!"); | |
137 | close(fd); | |
138 | return DBUS_METHOD_INVOCATION_HANDLED; | |
139 | } | |
140 | ||
141 | g_object_set(dc->iface, | |
142 | "owner", g_dbus_method_invocation_get_sender(invocation), | |
143 | NULL); | |
144 | ||
145 | qemu_dbus_display1_chardev_complete_register(object, invocation, NULL); | |
146 | return DBUS_METHOD_INVOCATION_HANDLED; | |
147 | } | |
148 | ||
149 | static gboolean | |
150 | dbus_chr_send_break( | |
151 | DBusChardev *dc, | |
152 | GDBusMethodInvocation *invocation, | |
153 | QemuDBusDisplay1Chardev *object) | |
154 | { | |
155 | qemu_chr_be_event(CHARDEV(dc), CHR_EVENT_BREAK); | |
156 | ||
157 | qemu_dbus_display1_chardev_complete_send_break(object, invocation); | |
158 | return DBUS_METHOD_INVOCATION_HANDLED; | |
159 | } | |
160 | ||
161 | static void | |
162 | dbus_chr_open(Chardev *chr, ChardevBackend *backend, | |
163 | bool *be_opened, Error **errp) | |
164 | { | |
165 | ERRP_GUARD(); | |
166 | ||
167 | DBusChardev *dc = DBUS_CHARDEV(chr); | |
168 | DBusDisplayEvent event = { | |
169 | .type = DBUS_DISPLAY_CHARDEV_OPEN, | |
170 | .chardev = dc, | |
171 | }; | |
172 | g_autoptr(ChardevBackend) be = NULL; | |
173 | g_autoptr(QemuOpts) opts = NULL; | |
174 | ||
175 | dc->iface = qemu_dbus_display1_chardev_skeleton_new(); | |
176 | g_object_set(dc->iface, "name", backend->u.dbus.data->name, NULL); | |
177 | g_object_connect(dc->iface, | |
178 | "swapped-signal::handle-register", | |
179 | dbus_chr_register, dc, | |
180 | "swapped-signal::handle-send-break", | |
181 | dbus_chr_send_break, dc, | |
182 | NULL); | |
183 | ||
184 | dbus_display_notify(&event); | |
185 | ||
186 | be = g_new0(ChardevBackend, 1); | |
187 | opts = qemu_opts_create(qemu_find_opts("chardev"), NULL, 0, &error_abort); | |
188 | qemu_opt_set(opts, "server", "on", &error_abort); | |
189 | qemu_opt_set(opts, "wait", "off", &error_abort); | |
190 | CHARDEV_CLASS(object_class_by_name(TYPE_CHARDEV_SOCKET))->parse( | |
191 | opts, be, errp); | |
192 | if (*errp) { | |
193 | return; | |
194 | } | |
195 | CHARDEV_CLASS(object_class_by_name(TYPE_CHARDEV_SOCKET))->open( | |
196 | chr, be, be_opened, errp); | |
197 | } | |
198 | ||
199 | static void | |
200 | dbus_chr_set_fe_open(Chardev *chr, int fe_open) | |
201 | { | |
202 | DBusChardev *dc = DBUS_CHARDEV(chr); | |
203 | ||
204 | g_object_set(dc->iface, "feopened", fe_open, NULL); | |
205 | } | |
206 | ||
207 | static void | |
208 | dbus_chr_set_echo(Chardev *chr, bool echo) | |
209 | { | |
210 | DBusChardev *dc = DBUS_CHARDEV(chr); | |
211 | ||
212 | g_object_set(dc->iface, "echo", echo, NULL); | |
213 | } | |
214 | ||
215 | static void | |
216 | dbus_chr_be_event(Chardev *chr, QEMUChrEvent event) | |
217 | { | |
218 | DBusChardev *dc = DBUS_CHARDEV(chr); | |
219 | DBusChardevClass *klass = DBUS_CHARDEV_GET_CLASS(chr); | |
220 | ||
221 | switch (event) { | |
222 | case CHR_EVENT_CLOSED: | |
223 | if (dc->iface) { | |
224 | /* on finalize, iface is set to NULL */ | |
225 | g_object_set(dc->iface, "owner", "", NULL); | |
226 | } | |
227 | break; | |
228 | default: | |
229 | break; | |
230 | }; | |
231 | ||
232 | klass->parent_chr_be_event(chr, event); | |
233 | } | |
234 | ||
235 | static void | |
236 | dbus_chr_parse(QemuOpts *opts, ChardevBackend *backend, | |
237 | Error **errp) | |
238 | { | |
239 | const char *name = qemu_opt_get(opts, "name"); | |
240 | ChardevDBus *dbus; | |
241 | ||
242 | if (name == NULL) { | |
243 | error_setg(errp, "chardev: dbus: no name given"); | |
244 | return; | |
245 | } | |
246 | ||
247 | backend->type = CHARDEV_BACKEND_KIND_DBUS; | |
248 | dbus = backend->u.dbus.data = g_new0(ChardevDBus, 1); | |
249 | qemu_chr_parse_common(opts, qapi_ChardevDBus_base(dbus)); | |
250 | dbus->name = g_strdup(name); | |
251 | } | |
252 | ||
253 | static void | |
254 | char_dbus_class_init(ObjectClass *oc, void *data) | |
255 | { | |
256 | DBusChardevClass *klass = DBUS_CHARDEV_CLASS(oc); | |
257 | ChardevClass *cc = CHARDEV_CLASS(oc); | |
258 | ||
259 | cc->parse = dbus_chr_parse; | |
260 | cc->open = dbus_chr_open; | |
261 | cc->chr_set_fe_open = dbus_chr_set_fe_open; | |
262 | cc->chr_set_echo = dbus_chr_set_echo; | |
263 | klass->parent_chr_be_event = cc->chr_be_event; | |
264 | cc->chr_be_event = dbus_chr_be_event; | |
265 | } | |
266 | ||
267 | static void | |
268 | char_dbus_finalize(Object *obj) | |
269 | { | |
270 | DBusChardev *dc = DBUS_CHARDEV(obj); | |
271 | DBusDisplayEvent event = { | |
272 | .type = DBUS_DISPLAY_CHARDEV_CLOSE, | |
273 | .chardev = dc, | |
274 | }; | |
275 | ||
276 | dbus_display_notify(&event); | |
277 | g_clear_object(&dc->iface); | |
278 | } | |
279 | ||
280 | static const TypeInfo char_dbus_type_info = { | |
281 | .name = TYPE_CHARDEV_DBUS, | |
282 | .parent = TYPE_CHARDEV_SOCKET, | |
283 | .class_size = sizeof(DBusChardevClass), | |
284 | .instance_size = sizeof(DBusChardev), | |
285 | .instance_finalize = char_dbus_finalize, | |
286 | .class_init = char_dbus_class_init, | |
287 | }; | |
288 | module_obj(TYPE_CHARDEV_DBUS); | |
289 | ||
290 | static void | |
291 | register_types(void) | |
292 | { | |
293 | type_register_static(&char_dbus_type_info); | |
294 | } | |
295 | ||
296 | type_init(register_types); |