plugins/dhclient.c

   1 /*
   2  *
   3  *  Connection Manager
   4  *
   5  *  Copyright (C) 2007-2009  Intel Corporation. All rights reserved.
   6  *
   7  *  This program is free software; you can redistribute it and/or modify
   8  *  it under the terms of the GNU General Public License version 2 as
   9  *  published by the Free Software Foundation.
  10  *
  11  *  This program is distributed in the hope that it will be useful,
  12  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  *  GNU General Public License for more details.
  15  *
  16  *  You should have received a copy of the GNU General Public License
  17  *  along with this program; if not, write to the Free Software
  18  *  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  19  *
  20  */
  21
  22 #ifdef HAVE_CONFIG_H
  23 #include <config.h>
  24 #endif
  25
  26 #include <unistd.h>
  27 #include <sys/wait.h>
  28 #include <glib/gstdio.h>
  29
  30 #define CONNMAN_API_SUBJECT_TO_CHANGE
  31 #include <connman/plugin.h>
  32 #include <connman/driver.h>
  33 #include <connman/inet.h>
  34 #include <connman/dbus.h>
  35 #include <connman/log.h>
  36
  37 #define DHCLIENT_INTF "org.isc.dhclient"
  38 #define DHCLIENT_PATH "/org/isc/dhclient"
  39
  40 static const char *busname;
  41
  42 struct dhclient_task {
  43         GPid pid;
  44         gboolean killed;
  45         int ifindex;
  46         gchar *ifname;
  47         struct connman_element *element;
  48         struct dhclient_task *pending;
  49 };
  50
  51 static GSList *task_list = NULL;
  52
  53 static struct dhclient_task *find_task_by_pid(GPid pid)
  54 {
  55         GSList *list;
  56
  57         for (list = task_list; list; list = list->next) {
  58                 struct dhclient_task *task = list->data;
  59
  60                 if (task->pid == pid)
  61                         return task;
  62         }
  63
  64         return NULL;
  65 }
  66
  67 static struct dhclient_task *find_task_by_index(int index)
  68 {
  69         GSList *list;
  70
  71         for (list = task_list; list; list = list->next) {
  72                 struct dhclient_task *task = list->data;
  73
  74                 if (task->ifindex == index)
  75                         return task;
  76         }
  77
  78         return NULL;
  79 }
  80
  81 static void kill_task(struct dhclient_task *task)
  82 {
  83         DBG("task %p name %s pid %d", task, task->ifname, task->pid);
  84
  85         if (task->killed == TRUE)
  86                 return;
  87
  88         if (task->pid > 0) {
  89                 task->killed = TRUE;
  90                 kill(task->pid, SIGTERM);
  91         }
  92 }
  93
  94 static void unlink_task(struct dhclient_task *task)
  95 {
  96         gchar *pathname;
  97
  98         DBG("task %p name %s pid %d", task, task->ifname, task->pid);
  99
 100         pathname = g_strdup_printf("%s/dhclient.%s.pid",
 101                                                 STATEDIR, task->ifname);
 102         g_unlink(pathname);
 103         g_free(pathname);
 104
 105         pathname = g_strdup_printf("%s/dhclient.%s.leases",
 106                                                 STATEDIR, task->ifname);
 107         g_unlink(pathname);
 108         g_free(pathname);
 109 }
 110
 111 static int start_dhclient(struct dhclient_task *task);
 112
 113 static void task_died(GPid pid, gint status, gpointer data)
 114 {
 115         struct dhclient_task *task = data;
 116
 117         if (WIFEXITED(status))
 118                 DBG("exit status %d for %s", WEXITSTATUS(status), task->ifname);
 119         else
 120                 DBG("signal %d killed %s", WTERMSIG(status), task->ifname);
 121
 122         g_spawn_close_pid(pid);
 123         task->pid = 0;
 124
 125         task_list = g_slist_remove(task_list, task);
 126
 127         unlink_task(task);
 128
 129         if (task->pending != NULL)
 130                 start_dhclient(task->pending);
 131
 132         g_free(task->ifname);
 133         g_free(task);
 134 }
 135
 136 static void task_setup(gpointer data)
 137 {
 138         struct dhclient_task *task = data;
 139
 140         DBG("task %p name %s", task, task->ifname);
 141
 142         task->killed = FALSE;
 143 }
 144
 145 static int start_dhclient(struct dhclient_task *task)
 146 {
 147         char *argv[16], *envp[1], address[128], pidfile[PATH_MAX];
 148         char leases[PATH_MAX], config[PATH_MAX], script[PATH_MAX];
 149
 150         snprintf(address, sizeof(address) - 1, "BUSNAME=%s", busname);
 151         snprintf(pidfile, sizeof(pidfile) - 1,
 152                         "%s/dhclient.%s.pid", STATEDIR, task->ifname);
 153         snprintf(leases, sizeof(leases) - 1,
 154                         "%s/dhclient.%s.leases", STATEDIR, task->ifname);
 155         snprintf(config, sizeof(config) - 1, "%s/dhclient.conf", SCRIPTDIR);
 156         snprintf(script, sizeof(script) - 1, "%s/dhclient-script", SCRIPTDIR);
 157
 158         argv[0] = DHCLIENT;
 159         argv[1] = "-d";
 160         argv[2] = "-q";
 161         argv[3] = "-e";
 162         argv[4] = address;
 163         argv[5] = "-pf";
 164         argv[6] = pidfile;
 165         argv[7] = "-lf";
 166         argv[8] = leases;
 167         argv[9] = "-cf";
 168         argv[10] = config;
 169         argv[11] = "-sf";
 170         argv[12] = script;
 171         argv[13] = task->ifname;
 172         argv[14] = "-n";
 173         argv[15] = NULL;
 174
 175         envp[0] = NULL;
 176
 177         if (g_spawn_async(NULL, argv, envp, G_SPAWN_DO_NOT_REAP_CHILD,
 178                                 task_setup, task, &task->pid, NULL) == FALSE) {
 179                 connman_error("Failed to spawn dhclient");
 180                 return -1;
 181         }
 182
 183         task_list = g_slist_append(task_list, task);
 184
 185         g_child_watch_add(task->pid, task_died, task);
 186
 187         DBG("executed %s with pid %d", DHCLIENT, task->pid);
 188
 189         return 0;
 190 }
 191
 192 static int dhclient_probe(struct connman_element *element)
 193 {
 194         struct dhclient_task *task, *previous;
 195         DBG("element %p name %s", element, element->name);
 196
 197         if (access(DHCLIENT, X_OK) < 0)
 198                 return -errno;
 199
 200         task = g_try_new0(struct dhclient_task, 1);
 201         if (task == NULL)
 202                 return -ENOMEM;
 203
 204         task->ifindex = element->index;
 205         task->ifname  = connman_inet_ifname(element->index);
 206         task->element = element;
 207
 208         if (task->ifname == NULL) {
 209                 g_free(task);
 210                 return -ENOMEM;
 211         }
 212
 213         previous= find_task_by_index(element->index);
 214         if (previous != NULL) {
 215                 previous->pending = task;
 216                 kill_task(previous);
 217                 return 0;
 218         }
 219
 220         return start_dhclient(task);
 221 }
 222
 223 static void dhclient_remove(struct connman_element *element)
 224 {
 225         struct dhclient_task *task;
 226
 227         DBG("element %p name %s", element, element->name);
 228
 229         task = find_task_by_index(element->index);
 230         if (task == NULL)
 231                 return;
 232
 233         DBG("release %s", task->ifname);
 234
 235         kill_task(task);
 236 }
 237
 238 static void dhclient_change(struct connman_element *element)
 239 {
 240         DBG("element %p name %s", element, element->name);
 241
 242         if (element->state == CONNMAN_ELEMENT_STATE_ERROR)
 243                 connman_element_set_error(element->parent,
 244                                         CONNMAN_ELEMENT_ERROR_DHCP_FAILED);
 245 }
 246
 247 static struct connman_driver dhclient_driver = {
 248         .name           = "dhclient",
 249         .type           = CONNMAN_ELEMENT_TYPE_DHCP,
 250         .probe          = dhclient_probe,
 251         .remove         = dhclient_remove,
 252         .change         = dhclient_change,
 253 };
 254
 255 static DBusHandlerResult dhclient_filter(DBusConnection *conn,
 256                                                 DBusMessage *msg, void *data)
 257 {
 258         DBusMessageIter iter, dict;
 259         dbus_uint32_t pid;
 260         struct dhclient_task *task;
 261         const char *text, *key, *value;
 262
 263         if (dbus_message_is_method_call(msg, DHCLIENT_INTF, "notify") == FALSE)
 264                 return DBUS_HANDLER_RESULT_NOT_YET_HANDLED;
 265
 266         dbus_message_iter_init(msg, &iter);
 267
 268         dbus_message_iter_get_basic(&iter, &pid);
 269         dbus_message_iter_next(&iter);
 270
 271         dbus_message_iter_get_basic(&iter, &text);
 272         dbus_message_iter_next(&iter);
 273
 274         DBG("change %d to %s", pid, text);
 275
 276         task = find_task_by_pid(pid);
 277
 278         if (task == NULL)
 279                 return DBUS_HANDLER_RESULT_NOT_YET_HANDLED;
 280
 281         dbus_message_iter_recurse(&iter, &dict);
 282
 283         while (dbus_message_iter_get_arg_type(&dict) == DBUS_TYPE_DICT_ENTRY) {
 284                 DBusMessageIter entry;
 285
 286                 dbus_message_iter_recurse(&dict, &entry);
 287                 dbus_message_iter_get_basic(&entry, &key);
 288                 dbus_message_iter_next(&entry);
 289                 dbus_message_iter_get_basic(&entry, &value);
 290
 291                 DBG("%s = %s", key, value);
 292
 293                 if (g_ascii_strcasecmp(key, "new_ip_address") == 0) {
 294                         g_free(task->element->ipv4.address);
 295                         task->element->ipv4.address = g_strdup(value);
 296                 }
 297
 298                 if (g_ascii_strcasecmp(key, "new_subnet_mask") == 0) {
 299                         g_free(task->element->ipv4.netmask);
 300                         task->element->ipv4.netmask = g_strdup(value);
 301                 }
 302
 303                 if (g_ascii_strcasecmp(key, "new_routers") == 0) {
 304                         g_free(task->element->ipv4.gateway);
 305                         task->element->ipv4.gateway = g_strdup(value);
 306                 }
 307
 308                 if (g_ascii_strcasecmp(key, "new_network_number") == 0) {
 309                         g_free(task->element->ipv4.network);
 310                         task->element->ipv4.network = g_strdup(value);
 311                 }
 312
 313                 if (g_ascii_strcasecmp(key, "new_broadcast_address") == 0) {
 314                         g_free(task->element->ipv4.broadcast);
 315                         task->element->ipv4.broadcast = g_strdup(value);
 316                 }
 317
 318                 if (g_ascii_strcasecmp(key, "new_domain_name_servers") == 0) {
 319                         g_free(task->element->ipv4.nameserver);
 320                         task->element->ipv4.nameserver = g_strdup(value);
 321                 }
 322
 323                 if (g_ascii_strcasecmp(key, "new_domain_name") == 0) {
 324                 }
 325
 326                 if (g_ascii_strcasecmp(key, "new_domain_search") == 0) {
 327                 }
 328
 329                 if (g_ascii_strcasecmp(key, "new_host_name") == 0) {
 330                 }
 331
 332                 dbus_message_iter_next(&dict);
 333         }
 334
 335         if (g_ascii_strcasecmp(text, "PREINIT") == 0) {
 336         } else if (g_ascii_strcasecmp(text, "BOUND") == 0 ||
 337                                 g_ascii_strcasecmp(text, "REBOOT") == 0) {
 338                 struct connman_element *element;
 339                 element = connman_element_create(NULL);
 340                 element->type = CONNMAN_ELEMENT_TYPE_IPV4;
 341                 element->index = task->ifindex;
 342                 connman_element_update(task->element);
 343                 if (connman_element_register(element, task->element) < 0)
 344                         connman_element_unref(element);
 345         } else if (g_ascii_strcasecmp(text, "RENEW") == 0 ||
 346                                 g_ascii_strcasecmp(text, "REBIND") == 0) {
 347                 connman_element_update(task->element);
 348         } else if (g_ascii_strcasecmp(text, "FAIL") == 0) {
 349                 connman_element_set_error(task->element,
 350                                                 CONNMAN_ELEMENT_ERROR_FAILED);
 351         } else {
 352         }
 353
 354         return DBUS_HANDLER_RESULT_HANDLED;
 355 }
 356
 357 static DBusConnection *connection;
 358
 359 static const char *dhclient_rule = "path=" DHCLIENT_PATH
 360                                                 ",interface=" DHCLIENT_INTF;
 361
 362 static int dhclient_init(void)
 363 {
 364         int err;
 365
 366         connection = connman_dbus_get_connection();
 367
 368         busname = dbus_bus_get_unique_name(connection);
 369         busname = CONNMAN_SERVICE;
 370
 371         dbus_connection_add_filter(connection, dhclient_filter, NULL, NULL);
 372
 373         dbus_bus_add_match(connection, dhclient_rule, NULL);
 374
 375         err = connman_driver_register(&dhclient_driver);
 376         if (err < 0) {
 377                 dbus_connection_unref(connection);
 378                 return err;
 379         }
 380
 381         return 0;
 382 }
 383
 384 static void dhclient_exit(void)
 385 {
 386         GSList *list;
 387
 388         for (list = task_list; list; list = list->next) {
 389                 struct dhclient_task *task = list->data;
 390
 391                 DBG("killing process %d", task->pid);
 392
 393                 kill_task(task);
 394                 unlink_task(task);
 395         }
 396
 397         g_slist_free(task_list);
 398
 399         connman_driver_unregister(&dhclient_driver);
 400
 401         dbus_bus_remove_match(connection, dhclient_rule, NULL);
 402
 403         dbus_connection_remove_filter(connection, dhclient_filter, NULL);
 404
 405         dbus_connection_unref(connection);
 406 }
 407
 408 CONNMAN_PLUGIN_DEFINE(dhclient, "ISC DHCP client plugin", VERSION,
 409                 CONNMAN_PLUGIN_PRIORITY_DEFAULT, dhclient_init, dhclient_exit)