1 /* 2 * wpa_supplicant D-Bus control interface - common functionality 3 * Copyright (c) 2006, Dan Williams <dcbw (at) redhat.com> and Red Hat, Inc. 4 * Copyright (c) 2009, Witold Sowa <witold.sowa (at) gmail.com> 5 * Copyright (c) 2009, Jouni Malinen <j (at) w1.fi> 6 * 7 * This software may be distributed under the terms of the BSD license. 8 * See README for more details. 9 */ 10 11 #include "utils/includes.h" 12 #include <dbus/dbus.h> 13 14 #include "utils/common.h" 15 #include "utils/eloop.h" 16 #include "dbus_common.h" 17 #include "dbus_common_i.h" 18 #include "dbus_new.h" 19 #include "dbus_old.h" 20 21 22 #ifndef SIGPOLL 23 #ifdef SIGIO 24 /* 25 * If we do not have SIGPOLL, try to use SIGIO instead. This is needed for 26 * FreeBSD. 27 */ 28 #define SIGPOLL SIGIO 29 #endif 30 #endif 31 32 33 static void dispatch_data(DBusConnection *con) 34 { 35 while (dbus_connection_get_dispatch_status(con) == 36 DBUS_DISPATCH_DATA_REMAINS) 37 dbus_connection_dispatch(con); 38 } 39 40 41 /** 42 * dispatch_initial_dbus_messages - Dispatch initial dbus messages after 43 * claiming bus name 44 * @eloop_ctx: the DBusConnection to dispatch on 45 * @timeout_ctx: unused 46 * 47 * If clients are quick to notice that service claimed its bus name, 48 * there may have been messages that came in before initialization was 49 * all finished. Dispatch those here. 50 */ 51 static void dispatch_initial_dbus_messages(void *eloop_ctx, void *timeout_ctx) 52 { 53 DBusConnection *con = eloop_ctx; 54 dispatch_data(con); 55 } 56 57 58 static void process_watch(struct wpas_dbus_priv *priv, 59 DBusWatch *watch, eloop_event_type type) 60 { 61 dbus_connection_ref(priv->con); 62 63 priv->should_dispatch = 0; 64 65 if (type == EVENT_TYPE_READ) 66 dbus_watch_handle(watch, DBUS_WATCH_READABLE); 67 else if (type == EVENT_TYPE_WRITE) 68 dbus_watch_handle(watch, DBUS_WATCH_WRITABLE); 69 else if (type == EVENT_TYPE_EXCEPTION) 70 dbus_watch_handle(watch, DBUS_WATCH_ERROR); 71 72 if (priv->should_dispatch) { 73 dispatch_data(priv->con); 74 priv->should_dispatch = 0; 75 } 76 77 dbus_connection_unref(priv->con); 78 } 79 80 81 static void process_watch_exception(int sock, void *eloop_ctx, void *sock_ctx) 82 { 83 process_watch(eloop_ctx, sock_ctx, EVENT_TYPE_EXCEPTION); 84 } 85 86 87 static void process_watch_read(int sock, void *eloop_ctx, void *sock_ctx) 88 { 89 process_watch(eloop_ctx, sock_ctx, EVENT_TYPE_READ); 90 } 91 92 93 static void process_watch_write(int sock, void *eloop_ctx, void *sock_ctx) 94 { 95 process_watch(eloop_ctx, sock_ctx, EVENT_TYPE_WRITE); 96 } 97 98 99 static dbus_bool_t add_watch(DBusWatch *watch, void *data) 100 { 101 struct wpas_dbus_priv *priv = data; 102 unsigned int flags; 103 int fd; 104 105 if (!dbus_watch_get_enabled(watch)) 106 return TRUE; 107 108 flags = dbus_watch_get_flags(watch); 109 fd = dbus_watch_get_unix_fd(watch); 110 111 eloop_register_sock(fd, EVENT_TYPE_EXCEPTION, process_watch_exception, 112 priv, watch); 113 114 if (flags & DBUS_WATCH_READABLE) { 115 eloop_register_sock(fd, EVENT_TYPE_READ, process_watch_read, 116 priv, watch); 117 } 118 if (flags & DBUS_WATCH_WRITABLE) { 119 eloop_register_sock(fd, EVENT_TYPE_WRITE, process_watch_write, 120 priv, watch); 121 } 122 123 dbus_watch_set_data(watch, priv, NULL); 124 125 return TRUE; 126 } 127 128 129 static void remove_watch(DBusWatch *watch, void *data) 130 { 131 unsigned int flags; 132 int fd; 133 134 flags = dbus_watch_get_flags(watch); 135 fd = dbus_watch_get_unix_fd(watch); 136 137 eloop_unregister_sock(fd, EVENT_TYPE_EXCEPTION); 138 139 if (flags & DBUS_WATCH_READABLE) 140 eloop_unregister_sock(fd, EVENT_TYPE_READ); 141 if (flags & DBUS_WATCH_WRITABLE) 142 eloop_unregister_sock(fd, EVENT_TYPE_WRITE); 143 144 dbus_watch_set_data(watch, NULL, NULL); 145 } 146 147 148 static void watch_toggled(DBusWatch *watch, void *data) 149 { 150 if (dbus_watch_get_enabled(watch)) 151 add_watch(watch, data); 152 else 153 remove_watch(watch, data); 154 } 155 156 157 static void process_timeout(void *eloop_ctx, void *sock_ctx) 158 { 159 DBusTimeout *timeout = sock_ctx; 160 dbus_timeout_handle(timeout); 161 } 162 163 164 static dbus_bool_t add_timeout(DBusTimeout *timeout, void *data) 165 { 166 struct wpas_dbus_priv *priv = data; 167 if (!dbus_timeout_get_enabled(timeout)) 168 return TRUE; 169 170 eloop_register_timeout(0, dbus_timeout_get_interval(timeout) * 1000, 171 process_timeout, priv, timeout); 172 173 dbus_timeout_set_data(timeout, priv, NULL); 174 175 return TRUE; 176 } 177 178 179 static void remove_timeout(DBusTimeout *timeout, void *data) 180 { 181 struct wpas_dbus_priv *priv = data; 182 eloop_cancel_timeout(process_timeout, priv, timeout); 183 dbus_timeout_set_data(timeout, NULL, NULL); 184 } 185 186 187 static void timeout_toggled(DBusTimeout *timeout, void *data) 188 { 189 if (dbus_timeout_get_enabled(timeout)) 190 add_timeout(timeout, data); 191 else 192 remove_timeout(timeout, data); 193 } 194 195 196 static void process_wakeup_main(int sig, void *signal_ctx) 197 { 198 struct wpas_dbus_priv *priv = signal_ctx; 199 200 if (sig != SIGPOLL || !priv->con) 201 return; 202 203 if (dbus_connection_get_dispatch_status(priv->con) != 204 DBUS_DISPATCH_DATA_REMAINS) 205 return; 206 207 /* Only dispatch once - we do not want to starve other events */ 208 dbus_connection_ref(priv->con); 209 dbus_connection_dispatch(priv->con); 210 dbus_connection_unref(priv->con); 211 } 212 213 214 /** 215 * wakeup_main - Attempt to wake our mainloop up 216 * @data: dbus control interface private data 217 * 218 * Try to wake up the main eloop so it will process 219 * dbus events that may have happened. 220 */ 221 static void wakeup_main(void *data) 222 { 223 struct wpas_dbus_priv *priv = data; 224 225 /* Use SIGPOLL to break out of the eloop select() */ 226 raise(SIGPOLL); 227 priv->should_dispatch = 1; 228 } 229 230 231 /** 232 * integrate_with_eloop - Register our mainloop integration with dbus 233 * @connection: connection to the system message bus 234 * @priv: a dbus control interface data structure 235 * Returns: 0 on success, -1 on failure 236 */ 237 static int integrate_with_eloop(struct wpas_dbus_priv *priv) 238 { 239 if (!dbus_connection_set_watch_functions(priv->con, add_watch, 240 remove_watch, watch_toggled, 241 priv, NULL) || 242 !dbus_connection_set_timeout_functions(priv->con, add_timeout, 243 remove_timeout, 244 timeout_toggled, priv, 245 NULL)) { 246 wpa_printf(MSG_ERROR, "dbus: Failed to set callback " 247 "functions"); 248 return -1; 249 } 250 251 if (eloop_register_signal(SIGPOLL, process_wakeup_main, priv)) 252 return -1; 253 dbus_connection_set_wakeup_main_function(priv->con, wakeup_main, 254 priv, NULL); 255 256 return 0; 257 } 258 259 260 static int wpas_dbus_init_common(struct wpas_dbus_priv *priv) 261 { 262 DBusError error; 263 int ret = 0; 264 265 /* Get a reference to the system bus */ 266 dbus_error_init(&error); 267 priv->con = dbus_bus_get(DBUS_BUS_SYSTEM, &error); 268 if (!priv->con) { 269 wpa_printf(MSG_ERROR, "dbus: Could not acquire the system " 270 "bus: %s - %s", error.name, error.message); 271 ret = -1; 272 } 273 dbus_error_free(&error); 274 275 return ret; 276 } 277 278 279 static int wpas_dbus_init_common_finish(struct wpas_dbus_priv *priv) 280 { 281 /* Tell dbus about our mainloop integration functions */ 282 integrate_with_eloop(priv); 283 284 /* 285 * Dispatch initial DBus messages that may have come in since the bus 286 * name was claimed above. Happens when clients are quick to notice the 287 * service. 288 * 289 * FIXME: is there a better solution to this problem? 290 */ 291 eloop_register_timeout(0, 50, dispatch_initial_dbus_messages, 292 priv->con, NULL); 293 294 return 0; 295 } 296 297 298 static void wpas_dbus_deinit_common(struct wpas_dbus_priv *priv) 299 { 300 if (priv->con) { 301 eloop_cancel_timeout(dispatch_initial_dbus_messages, 302 priv->con, NULL); 303 dbus_connection_set_watch_functions(priv->con, NULL, NULL, 304 NULL, NULL, NULL); 305 dbus_connection_set_timeout_functions(priv->con, NULL, NULL, 306 NULL, NULL, NULL); 307 dbus_connection_unref(priv->con); 308 } 309 310 os_free(priv); 311 } 312 313 314 struct wpas_dbus_priv * wpas_dbus_init(struct wpa_global *global) 315 { 316 struct wpas_dbus_priv *priv; 317 318 priv = os_zalloc(sizeof(*priv)); 319 if (priv == NULL) 320 return NULL; 321 priv->global = global; 322 323 if (wpas_dbus_init_common(priv) < 0) { 324 wpas_dbus_deinit(priv); 325 return NULL; 326 } 327 328 #ifdef CONFIG_CTRL_IFACE_DBUS_NEW 329 if (wpas_dbus_ctrl_iface_init(priv) < 0) { 330 wpas_dbus_deinit(priv); 331 return NULL; 332 } 333 #endif /* CONFIG_CTRL_IFACE_DBUS_NEW */ 334 335 #ifdef CONFIG_CTRL_IFACE_DBUS 336 if (wpa_supplicant_dbus_ctrl_iface_init(priv) < 0) { 337 wpas_dbus_deinit(priv); 338 return NULL; 339 } 340 #endif /* CONFIG_CTRL_IFACE_DBUS */ 341 342 if (wpas_dbus_init_common_finish(priv) < 0) { 343 wpas_dbus_deinit(priv); 344 return NULL; 345 } 346 347 return priv; 348 } 349 350 351 void wpas_dbus_deinit(struct wpas_dbus_priv *priv) 352 { 353 if (priv == NULL) 354 return; 355 356 #ifdef CONFIG_CTRL_IFACE_DBUS_NEW 357 wpas_dbus_ctrl_iface_deinit(priv); 358 #endif /* CONFIG_CTRL_IFACE_DBUS_NEW */ 359 360 #ifdef CONFIG_CTRL_IFACE_DBUS 361 /* TODO: is any deinit needed? */ 362 #endif /* CONFIG_CTRL_IFACE_DBUS */ 363 364 wpas_dbus_deinit_common(priv); 365 } 366
