vcs.maemo.org Git - connman/blob - 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         int ifindex;
  45         gchar *ifname;
  46         struct connman_element *element;
  47 };
  48
  49 static GSList *task_list = NULL;
  50
  51 static struct dhclient_task *find_task_by_pid(GPid pid)
  52 {
  53         GSList *list;
  54
  55         for (list = task_list; list; list = list->next) {
  56                 struct dhclient_task *task = list->data;
  57
  58                 if (task->pid == pid)
  59                         return task;
  60         }
  61
  62         return NULL;
  63 }
  64
  65 static struct dhclient_task *find_task_by_index(int index)
  66 {
  67         GSList *list;
  68
  69         for (list = task_list; list; list = list->next) {
  70                 struct dhclient_task *task = list->data;
  71
  72                 if (task->ifindex == index)
  73                         return task;
  74         }
  75
  76         return NULL;
  77 }
  78
  79 static void kill_task(struct dhclient_task *task)
  80 {
  81         DBG("task %p name %s pid %d", task, task->ifname, task->pid);
  82
  83         if (task->pid > 0)
  84                 kill(task->pid, SIGTERM);
  85 }
  86
  87 static void unlink_task(struct dhclient_task *task)
  88 {
  89         gchar *pathname;
  90
  91         DBG("task %p name %s pid %d", task, task->ifname, task->pid);
  92
  93         pathname = g_strdup_printf("%s/dhclient.%s.pid",
  94                                                 STATEDIR, task->ifname);
  95         g_unlink(pathname);
  96         g_free(pathname);
  97
  98         pathname = g_strdup_printf("%s/dhclient.%s.leases",
  99                                                 STATEDIR, task->ifname);
 100         g_unlink(pathname);
 101         g_free(pathname);
 102 }
 103
 104 static void task_died(GPid pid, gint status, gpointer data)
 105 {
 106         struct dhclient_task *task = data;
 107
 108         if (WIFEXITED(status))
 109                 DBG("exit status %d for %s", WEXITSTATUS(status), task->ifname);
 110         else
 111                 DBG("signal %d killed %s", WTERMSIG(status), task->ifname);
 112
 113         g_spawn_close_pid(pid);
 114         task->pid = 0;
 115
 116         task_list = g_slist_remove(task_list, task);
 117
 118         unlink_task(task);
 119
 120         g_free(task->ifname);
 121         g_free(task);
 122 }
 123
 124 static void task_setup(gpointer data)
 125 {
 126         struct dhclient_task *task = data;
 127
 128         DBG("task %p name %s", task, task->ifname);
 129 }
 130
 131 static int dhclient_probe(struct connman_element *element)
 132 {
 133         struct dhclient_task *task;
 134         char *argv[16], *envp[1], address[128], pidfile[PATH_MAX];
 135         char leases[PATH_MAX], config[PATH_MAX], script[PATH_MAX];
 136
 137         DBG("element %p name %s", element, element->name);
 138
 139         if (access(DHCLIENT, X_OK) < 0)
 140                 return -errno;
 141
 142         task = g_try_new0(struct dhclient_task, 1);
 143         if (task == NULL)
 144                 return -ENOMEM;
 145
 146         task->ifindex = element->index;
 147         task->ifname = connman_inet_ifname(element->index);
 148         task->element = element;
 149
 150         if (task->ifname == NULL) {
 151                 g_free(task);
 152                 return -ENOMEM;
 153         }
 154
 155         DBG("request %s", task->ifname);
 156
 157         snprintf(address, sizeof(address) - 1, "BUSNAME=%s", busname);
 158         snprintf(pidfile, sizeof(pidfile) - 1,
 159                         "%s/dhclient.%s.pid", STATEDIR, task->ifname);
 160         snprintf(leases, sizeof(leases) - 1,
 161                         "%s/dhclient.%s.leases", STATEDIR, task->ifname);
 162         snprintf(config, sizeof(config) - 1, "%s/dhclient.conf", SCRIPTDIR);
 163         snprintf(script, sizeof(script) - 1, "%s/dhclient-script", SCRIPTDIR);
 164
 165         argv[0] = DHCLIENT;
 166         argv[1] = "-d";
 167         argv[2] = "-q";
 168         argv[3] = "-n";
 169         argv[4] = "-e";
 170         argv[5] = address;
 171         argv[6] = "-pf";
 172         argv[7] = pidfile;
 173         argv[8] = "-lf";
 174         argv[9] = leases;
 175         argv[10] = "-cf";
 176         argv[11] = config;
 177         argv[12] = "-sf";
 178         argv[13] = script;
 179         argv[14] = task->ifname;
 180         argv[15] = NULL;
 181
 182         envp[0] = NULL;
 183
 184         if (g_spawn_async(NULL, argv, envp, G_SPAWN_DO_NOT_REAP_CHILD,
 185                                 task_setup, task, &task->pid, NULL) == FALSE) {
 186                 connman_error("Failed to spawn dhclient");
 187                 return -1;
 188         }
 189
 190         task_list = g_slist_append(task_list, task);
 191
 192         g_child_watch_add(task->pid, task_died, task);
 193
 194         DBG("executed %s with pid %d", DHCLIENT, task->pid);
 195
 196         return 0;
 197 }
 198
 199 static void dhclient_remove(struct connman_element *element)
 200 {
 201         struct dhclient_task *task;
 202
 203         DBG("element %p name %s", element, element->name);
 204
 205         task = find_task_by_index(element->index);
 206         if (task != NULL)
 207                 task_list = g_slist_remove(task_list, task);
 208
 209         if (task == NULL)
 210                 return;
 211
 212         DBG("release %s", task->ifname);
 213
 214         kill_task(task);
 215 }
 216
 217 static void dhclient_change(struct connman_element *element)
 218 {
 219         DBG("element %p name %s", element, element->name);
 220
 221         if (element->state == CONNMAN_ELEMENT_STATE_ERROR)
 222                 connman_element_set_error(element->parent,
 223                                         CONNMAN_ELEMENT_ERROR_DHCP_FAILED);
 224 }
 225
 226 static struct connman_driver dhclient_driver = {
 227         .name           = "dhclient",
 228         .type           = CONNMAN_ELEMENT_TYPE_DHCP,
 229         .probe          = dhclient_probe,
 230         .remove         = dhclient_remove,
 231         .change         = dhclient_change,
 232 };
 233
 234 static DBusHandlerResult dhclient_filter(DBusConnection *conn,
 235                                                 DBusMessage *msg, void *data)
 236 {
 237         DBusMessageIter iter, dict;
 238         dbus_uint32_t pid;
 239         struct dhclient_task *task;
 240         const char *text, *key, *value;
 241
 242         if (dbus_message_is_method_call(msg, DHCLIENT_INTF, "notify") == FALSE)
 243                 return DBUS_HANDLER_RESULT_NOT_YET_HANDLED;
 244
 245         dbus_message_iter_init(msg, &iter);
 246
 247         dbus_message_iter_get_basic(&iter, &pid);
 248         dbus_message_iter_next(&iter);
 249
 250         dbus_message_iter_get_basic(&iter, &text);
 251         dbus_message_iter_next(&iter);
 252
 253         DBG("change %d to %s", pid, text);
 254
 255         task = find_task_by_pid(pid);
 256
 257         if (task == NULL)
 258                 return DBUS_HANDLER_RESULT_NOT_YET_HANDLED;
 259
 260         dbus_message_iter_recurse(&iter, &dict);
 261
 262         while (dbus_message_iter_get_arg_type(&dict) == DBUS_TYPE_DICT_ENTRY) {
 263                 DBusMessageIter entry;
 264
 265                 dbus_message_iter_recurse(&dict, &entry);
 266                 dbus_message_iter_get_basic(&entry, &key);
 267                 dbus_message_iter_next(&entry);
 268                 dbus_message_iter_get_basic(&entry, &value);
 269
 270                 DBG("%s = %s", key, value);
 271
 272                 if (g_ascii_strcasecmp(key, "new_ip_address") == 0) {
 273                         g_free(task->element->ipv4.address);
 274                         task->element->ipv4.address = g_strdup(value);
 275                 }
 276
 277                 if (g_ascii_strcasecmp(key, "new_subnet_mask") == 0) {
 278                         g_free(task->element->ipv4.netmask);
 279                         task->element->ipv4.netmask = g_strdup(value);
 280                 }
 281
 282                 if (g_ascii_strcasecmp(key, "new_routers") == 0) {
 283                         g_free(task->element->ipv4.gateway);
 284                         task->element->ipv4.gateway = g_strdup(value);
 285                 }
 286
 287                 if (g_ascii_strcasecmp(key, "new_network_number") == 0) {
 288                         g_free(task->element->ipv4.network);
 289                         task->element->ipv4.network = g_strdup(value);
 290                 }
 291
 292                 if (g_ascii_strcasecmp(key, "new_broadcast_address") == 0) {
 293                         g_free(task->element->ipv4.broadcast);
 294                         task->element->ipv4.broadcast = g_strdup(value);
 295                 }
 296
 297                 if (g_ascii_strcasecmp(key, "new_domain_name_servers") == 0) {
 298                         g_free(task->element->ipv4.nameserver);
 299                         task->element->ipv4.nameserver = g_strdup(value);
 300                 }
 301
 302                 dbus_message_iter_next(&dict);
 303         }
 304
 305         if (g_ascii_strcasecmp(text, "PREINIT") == 0) {
 306         } else if (g_ascii_strcasecmp(text, "BOUND") == 0 ||
 307                                 g_ascii_strcasecmp(text, "REBOOT") == 0) {
 308                 struct connman_element *element;
 309                 element = connman_element_create(NULL);
 310                 element->type = CONNMAN_ELEMENT_TYPE_IPV4;
 311                 element->index = task->ifindex;
 312                 connman_element_update(task->element);
 313                 if (connman_element_register(element, task->element) < 0)
 314                         connman_element_unref(element);
 315         } else if (g_ascii_strcasecmp(text, "RENEW") == 0 ||
 316                                 g_ascii_strcasecmp(text, "REBIND") == 0) {
 317                 connman_element_update(task->element);
 318         } else if (g_ascii_strcasecmp(text, "FAIL") == 0) {
 319                 connman_element_set_error(task->element,
 320                                                 CONNMAN_ELEMENT_ERROR_FAILED);
 321         } else {
 322         }
 323
 324         return DBUS_HANDLER_RESULT_HANDLED;
 325 }
 326
 327 static DBusConnection *connection;
 328
 329 static const char *dhclient_rule = "path=" DHCLIENT_PATH
 330                                                 ",interface=" DHCLIENT_INTF;
 331
 332 static int dhclient_init(void)
 333 {
 334         int err;
 335
 336         connection = connman_dbus_get_connection();
 337
 338         busname = dbus_bus_get_unique_name(connection);
 339         busname = CONNMAN_SERVICE;
 340
 341         dbus_connection_add_filter(connection, dhclient_filter, NULL, NULL);
 342
 343         dbus_bus_add_match(connection, dhclient_rule, NULL);
 344
 345         err = connman_driver_register(&dhclient_driver);
 346         if (err < 0) {
 347                 dbus_connection_unref(connection);
 348                 return err;
 349         }
 350
 351         return 0;
 352 }
 353
 354 static void dhclient_exit(void)
 355 {
 356         GSList *list;
 357
 358         for (list = task_list; list; list = list->next) {
 359                 struct dhclient_task *task = list->data;
 360
 361                 DBG("killing process %d", task->pid);
 362
 363                 kill_task(task);
 364                 unlink_task(task);
 365         }
 366
 367         g_slist_free(task_list);
 368
 369         connman_driver_unregister(&dhclient_driver);
 370
 371         dbus_bus_remove_match(connection, dhclient_rule, NULL);
 372
 373         dbus_connection_remove_filter(connection, dhclient_filter, NULL);
 374
 375         dbus_connection_unref(connection);
 376 }
 377
 378 CONNMAN_PLUGIN_DEFINE(dhclient, "ISC DHCP client plugin", VERSION,
 379                 CONNMAN_PLUGIN_PRIORITY_DEFAULT, dhclient_init, dhclient_exit)