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a09e091a JB |
1 | /* |
2 | * Copyright © 2006-2007 Daniel Stone | |
3 | * | |
4 | * Permission is hereby granted, free of charge, to any person obtaining a | |
5 | * copy of this software and associated documentation files (the "Software"), | |
6 | * to deal in the Software without restriction, including without limitation | |
7 | * the rights to use, copy, modify, merge, publish, distribute, sublicense, | |
8 | * and/or sell copies of the Software, and to permit persons to whom the | |
9 | * Software is furnished to do so, subject to the following conditions: | |
10 | * | |
11 | * The above copyright notice and this permission notice (including the next | |
12 | * paragraph) shall be included in all copies or substantial portions of the | |
13 | * Software. | |
14 | * | |
15 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | |
16 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
17 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL | |
18 | * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | |
19 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING | |
20 | * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER | |
21 | * DEALINGS IN THE SOFTWARE. | |
22 | * | |
23 | * Author: Daniel Stone <daniel@fooishbar.org> | |
24 | */ | |
25 | ||
26 | #ifdef HAVE_DIX_CONFIG_H | |
27 | #include <dix-config.h> | |
28 | #endif | |
29 | ||
30 | #include <dbus/dbus.h> | |
31 | #include <string.h> | |
32 | ||
33 | #include <X11/X.h> | |
34 | ||
35 | #include "config-backends.h" | |
36 | #include "opaque.h" /* for 'display': there should be a better way. */ | |
37 | #include "input.h" | |
38 | #include "inputstr.h" | |
39 | ||
40 | #define API_VERSION 2 | |
41 | ||
42 | #define MATCH_RULE "type='method_call',interface='org.x.config.input'" | |
43 | ||
44 | #define MALFORMED_MSG "[config/dbus] malformed message, dropping" | |
45 | #define MALFORMED_MESSAGE() { DebugF(MALFORMED_MSG "\n"); \ | |
46 | ret = BadValue; \ | |
47 | goto unwind; } | |
48 | #define MALFORMED_MESSAGE_ERROR() { DebugF(MALFORMED_MSG ": %s, %s", \ | |
49 | error->name, error->message); \ | |
50 | ret = BadValue; \ | |
51 | goto unwind; } | |
52 | ||
53 | struct connection_info { | |
54 | char busobject[32]; | |
55 | char busname[64]; | |
56 | DBusConnection *connection; | |
57 | }; | |
58 | ||
59 | static void | |
60 | reset_info(struct connection_info *info) | |
61 | { | |
62 | info->connection = NULL; | |
63 | info->busname[0] = '\0'; | |
64 | info->busobject[0] = '\0'; | |
65 | } | |
66 | ||
67 | static int | |
68 | add_device(DBusMessage * message, DBusMessage * reply, DBusError * error) | |
69 | { | |
70 | DBusMessageIter iter, reply_iter, subiter; | |
71 | InputOption *input_options = NULL; | |
72 | int ret, err; | |
73 | DeviceIntPtr dev = NULL; | |
74 | ||
75 | dbus_message_iter_init_append(reply, &reply_iter); | |
76 | ||
77 | if (!dbus_message_iter_init(message, &iter)) { | |
78 | ErrorF("[config/dbus] couldn't initialise iterator\n"); | |
79 | MALFORMED_MESSAGE(); | |
80 | } | |
81 | ||
82 | input_options = input_option_new(input_options, "_source", "client/dbus"); | |
83 | if (!input_options) { | |
84 | ErrorF("[config/dbus] couldn't allocate first key/value pair\n"); | |
85 | ret = BadAlloc; | |
86 | goto unwind; | |
87 | } | |
88 | ||
89 | /* signature should be [ss][ss]... */ | |
90 | while (dbus_message_iter_get_arg_type(&iter) == DBUS_TYPE_ARRAY) { | |
91 | char *key, *value; | |
92 | ||
93 | dbus_message_iter_recurse(&iter, &subiter); | |
94 | ||
95 | if (dbus_message_iter_get_arg_type(&subiter) != DBUS_TYPE_STRING) | |
96 | MALFORMED_MESSAGE(); | |
97 | ||
98 | dbus_message_iter_get_basic(&subiter, &key); | |
99 | if (!key) | |
100 | MALFORMED_MESSAGE(); | |
101 | /* The _ prefix refers to internal settings, and may not be given by | |
102 | * the client. */ | |
103 | if (key[0] == '_') { | |
104 | ErrorF("[config/dbus] attempted subterfuge: option name %s given\n", | |
105 | key); | |
106 | MALFORMED_MESSAGE(); | |
107 | } | |
108 | ||
109 | if (!dbus_message_iter_has_next(&subiter)) | |
110 | MALFORMED_MESSAGE(); | |
111 | dbus_message_iter_next(&subiter); | |
112 | if (dbus_message_iter_get_arg_type(&subiter) != DBUS_TYPE_STRING) | |
113 | MALFORMED_MESSAGE(); | |
114 | ||
115 | dbus_message_iter_get_basic(&subiter, &value); | |
116 | if (!value) | |
117 | MALFORMED_MESSAGE(); | |
118 | ||
119 | input_options = input_option_new(input_options, key, value); | |
120 | ||
121 | dbus_message_iter_next(&iter); | |
122 | } | |
123 | ||
124 | ret = NewInputDeviceRequest(input_options, NULL, &dev); | |
125 | if (ret != Success) { | |
126 | DebugF("[config/dbus] NewInputDeviceRequest failed\n"); | |
127 | goto unwind; | |
128 | } | |
129 | ||
130 | if (!dev) { | |
131 | DebugF("[config/dbus] NewInputDeviceRequest provided no device\n"); | |
132 | ret = BadImplementation; | |
133 | goto unwind; | |
134 | } | |
135 | ||
136 | /* XXX: If we fail halfway through, we don't seem to have any way to | |
137 | * empty the iterator, so you'll end up with some device IDs, | |
138 | * plus an error. This seems to be a shortcoming in the D-Bus | |
139 | * API. */ | |
140 | for (; dev; dev = dev->next) { | |
141 | if (!dbus_message_iter_append_basic(&reply_iter, DBUS_TYPE_INT32, | |
142 | &dev->id)) { | |
143 | ErrorF("[config/dbus] couldn't append to iterator\n"); | |
144 | ret = BadAlloc; | |
145 | goto unwind; | |
146 | } | |
147 | } | |
148 | ||
149 | unwind: | |
150 | if (ret != Success) { | |
151 | if (dev) | |
152 | RemoveDevice(dev, TRUE); | |
153 | ||
154 | err = -ret; | |
155 | dbus_message_iter_append_basic(&reply_iter, DBUS_TYPE_INT32, &err); | |
156 | } | |
157 | ||
158 | input_option_free_list(&input_options); | |
159 | ||
160 | return ret; | |
161 | } | |
162 | ||
163 | static int | |
164 | remove_device(DBusMessage * message, DBusMessage * reply, DBusError * error) | |
165 | { | |
166 | int deviceid, ret, err; | |
167 | DeviceIntPtr dev; | |
168 | DBusMessageIter iter, reply_iter; | |
169 | ||
170 | dbus_message_iter_init_append(reply, &reply_iter); | |
171 | ||
172 | if (!dbus_message_iter_init(message, &iter)) { | |
173 | ErrorF("[config/dbus] failed to init iterator\n"); | |
174 | MALFORMED_MESSAGE(); | |
175 | } | |
176 | ||
177 | if (!dbus_message_get_args(message, error, DBUS_TYPE_UINT32, | |
178 | &deviceid, DBUS_TYPE_INVALID)) { | |
179 | MALFORMED_MESSAGE_ERROR(); | |
180 | } | |
181 | ||
182 | dixLookupDevice(&dev, deviceid, serverClient, DixDestroyAccess); | |
183 | if (!dev) { | |
184 | DebugF("[config/dbus] bogus device id %d given\n", deviceid); | |
185 | ret = BadMatch; | |
186 | goto unwind; | |
187 | } | |
188 | ||
189 | DebugF("[config/dbus] removing device %s (id %d)\n", dev->name, deviceid); | |
190 | ||
191 | /* Call PIE here so we don't try to dereference a device that's | |
192 | * already been removed. */ | |
193 | OsBlockSignals(); | |
194 | ProcessInputEvents(); | |
195 | DeleteInputDeviceRequest(dev); | |
196 | OsReleaseSignals(); | |
197 | ||
198 | ret = Success; | |
199 | ||
200 | unwind: | |
201 | err = (ret == Success) ? ret : -ret; | |
202 | dbus_message_iter_append_basic(&reply_iter, DBUS_TYPE_INT32, &err); | |
203 | ||
204 | return ret; | |
205 | } | |
206 | ||
207 | static int | |
208 | list_devices(DBusMessage * message, DBusMessage * reply, DBusError * error) | |
209 | { | |
210 | DeviceIntPtr dev; | |
211 | DBusMessageIter iter, subiter; | |
212 | ||
213 | dbus_message_iter_init_append(reply, &iter); | |
214 | ||
215 | for (dev = inputInfo.devices; dev; dev = dev->next) { | |
216 | if (!dbus_message_iter_open_container(&iter, DBUS_TYPE_STRUCT, NULL, | |
217 | &subiter)) { | |
218 | ErrorF("[config/dbus] couldn't init container\n"); | |
219 | return BadAlloc; | |
220 | } | |
221 | if (!dbus_message_iter_append_basic(&subiter, DBUS_TYPE_UINT32, | |
222 | &dev->id)) { | |
223 | ErrorF("[config/dbus] couldn't append to iterator\n"); | |
224 | return BadAlloc; | |
225 | } | |
226 | if (!dbus_message_iter_append_basic(&subiter, DBUS_TYPE_STRING, | |
227 | &dev->name)) { | |
228 | ErrorF("[config/dbus] couldn't append to iterator\n"); | |
229 | return BadAlloc; | |
230 | } | |
231 | if (!dbus_message_iter_close_container(&iter, &subiter)) { | |
232 | ErrorF("[config/dbus] couldn't close container\n"); | |
233 | return BadAlloc; | |
234 | } | |
235 | } | |
236 | ||
237 | return Success; | |
238 | } | |
239 | ||
240 | static int | |
241 | get_version(DBusMessage * message, DBusMessage * reply, DBusError * error) | |
242 | { | |
243 | DBusMessageIter iter; | |
244 | unsigned int version = API_VERSION; | |
245 | ||
246 | dbus_message_iter_init_append(reply, &iter); | |
247 | if (!dbus_message_iter_append_basic(&iter, DBUS_TYPE_UINT32, &version)) { | |
248 | ErrorF("[config/dbus] couldn't append version\n"); | |
249 | return BadAlloc; | |
250 | } | |
251 | ||
252 | return Success; | |
253 | } | |
254 | ||
255 | static DBusHandlerResult | |
256 | message_handler(DBusConnection * connection, DBusMessage * message, void *data) | |
257 | { | |
258 | DBusError error; | |
259 | DBusMessage *reply; | |
260 | struct connection_info *info = data; | |
261 | ||
262 | /* ret is the overall D-Bus handler result, whereas err is the internal | |
263 | * X error from our individual functions. */ | |
264 | int ret = DBUS_HANDLER_RESULT_NOT_YET_HANDLED; | |
265 | int err; | |
266 | ||
267 | DebugF("[config/dbus] received a message for %s\n", | |
268 | dbus_message_get_interface(message)); | |
269 | ||
270 | dbus_error_init(&error); | |
271 | ||
272 | reply = dbus_message_new_method_return(message); | |
273 | if (!reply) { | |
274 | ErrorF("[config/dbus] failed to create reply\n"); | |
275 | ret = DBUS_HANDLER_RESULT_NEED_MEMORY; | |
276 | goto err_start; | |
277 | } | |
278 | ||
279 | if (strcmp(dbus_message_get_member(message), "add") == 0) | |
280 | err = add_device(message, reply, &error); | |
281 | else if (strcmp(dbus_message_get_member(message), "remove") == 0) | |
282 | err = remove_device(message, reply, &error); | |
283 | else if (strcmp(dbus_message_get_member(message), "listDevices") == 0) | |
284 | err = list_devices(message, reply, &error); | |
285 | else if (strcmp(dbus_message_get_member(message), "version") == 0) | |
286 | err = get_version(message, reply, &error); | |
287 | else | |
288 | goto err_reply; | |
289 | ||
290 | /* Failure to allocate is a special case. */ | |
291 | if (err == BadAlloc) { | |
292 | ret = DBUS_HANDLER_RESULT_NEED_MEMORY; | |
293 | goto err_reply; | |
294 | } | |
295 | ||
296 | /* While failure here is always an OOM, we don't return that, | |
297 | * since that would result in devices being double-added/removed. */ | |
298 | if (dbus_connection_send(info->connection, reply, NULL)) | |
299 | dbus_connection_flush(info->connection); | |
300 | else | |
301 | ErrorF("[config/dbus] failed to send reply\n"); | |
302 | ||
303 | ret = DBUS_HANDLER_RESULT_HANDLED; | |
304 | ||
305 | err_reply: | |
306 | dbus_message_unref(reply); | |
307 | err_start: | |
308 | dbus_error_free(&error); | |
309 | ||
310 | return ret; | |
311 | } | |
312 | ||
313 | static void | |
314 | connect_hook(DBusConnection * connection, void *data) | |
315 | { | |
316 | DBusError error; | |
317 | DBusObjectPathVTable vtable = {.message_function = message_handler, }; | |
318 | struct connection_info *info = data; | |
319 | ||
320 | info->connection = connection; | |
321 | ||
322 | dbus_error_init(&error); | |
323 | ||
324 | dbus_bus_request_name(info->connection, info->busname, 0, &error); | |
325 | if (dbus_error_is_set(&error)) { | |
326 | ErrorF("[config/dbus] couldn't take over org.x.config: %s (%s)\n", | |
327 | error.name, error.message); | |
328 | goto err_start; | |
329 | } | |
330 | ||
331 | /* blocks until we get a reply. */ | |
332 | dbus_bus_add_match(info->connection, MATCH_RULE, &error); | |
333 | if (dbus_error_is_set(&error)) { | |
334 | ErrorF("[config/dbus] couldn't add match: %s (%s)\n", error.name, | |
335 | error.message); | |
336 | goto err_name; | |
337 | } | |
338 | ||
339 | if (!dbus_connection_register_object_path(info->connection, | |
340 | info->busobject, &vtable, info)) { | |
341 | ErrorF("[config/dbus] couldn't register object path\n"); | |
342 | goto err_match; | |
343 | } | |
344 | ||
345 | DebugF("[dbus] registered %s, %s\n", info->busname, info->busobject); | |
346 | ||
347 | dbus_error_free(&error); | |
348 | ||
349 | return; | |
350 | ||
351 | err_match: | |
352 | dbus_bus_remove_match(info->connection, MATCH_RULE, &error); | |
353 | err_name: | |
354 | dbus_bus_release_name(info->connection, info->busname, &error); | |
355 | err_start: | |
356 | dbus_error_free(&error); | |
357 | ||
358 | reset_info(info); | |
359 | } | |
360 | ||
361 | static void | |
362 | disconnect_hook(void *data) | |
363 | { | |
364 | } | |
365 | ||
366 | #if 0 | |
367 | void | |
368 | pre_disconnect_hook(void) | |
369 | { | |
370 | DBusError error; | |
371 | ||
372 | dbus_error_init(&error); | |
373 | dbus_connection_unregister_object_path(connection_data->connection, | |
374 | connection_data->busobject); | |
375 | dbus_bus_remove_match(connection_data->connection, MATCH_RULE, &error); | |
376 | dbus_bus_release_name(connection_data->connection, | |
377 | connection_data->busname, &error); | |
378 | dbus_error_free(&error); | |
379 | } | |
380 | #endif | |
381 | ||
382 | static struct connection_info connection_data; | |
383 | ||
384 | static struct config_dbus_core_hook core_hook = { | |
385 | .connect = connect_hook, | |
386 | .disconnect = disconnect_hook, | |
387 | .data = &connection_data, | |
388 | }; | |
389 | ||
390 | int | |
391 | config_dbus_init(void) | |
392 | { | |
393 | snprintf(connection_data.busname, sizeof(connection_data.busname), | |
394 | "org.x.config.display%d", atoi(display)); | |
395 | snprintf(connection_data.busobject, sizeof(connection_data.busobject), | |
396 | "/org/x/config/%d", atoi(display)); | |
397 | ||
398 | return config_dbus_core_add_hook(&core_hook); | |
399 | } | |
400 | ||
401 | void | |
402 | config_dbus_fini(void) | |
403 | { | |
404 | config_dbus_core_remove_hook(&core_hook); | |
405 | connection_data.busname[0] = '\0'; | |
406 | connection_data.busobject[0] = '\0'; | |
407 | } |