plugins/dhclient.c

   1 /*
   2  *
   3  *  Connection Manager
   4  *
   5  *  Copyright (C) 2007-2008  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 <sys/wait.h>
  27 #include <glib/gstdio.h>
  28
  29 #include <connman/plugin.h>
  30 #include <connman/driver.h>
  31 #include <connman/dbus.h>
  32 #include <connman/log.h>
  33
  34 #define DHCLIENT_INTF "org.isc.dhclient"
  35 #define DHCLIENT_PATH "/org/isc/dhclient"
  36
  37 static const char *busname;
  38
  39 struct dhclient_task {
  40         GPid pid;
  41         int ifindex;
  42         gchar *ifname;
  43         struct connman_element *element;
  44         struct connman_element *child;
  45 };
  46
  47 static GStaticMutex task_mutex = G_STATIC_MUTEX_INIT;
  48 static GSList *task_list = NULL;
  49
  50 static struct dhclient_task *find_task_by_pid(GPid pid)
  51 {
  52         GSList *list;
  53
  54         for (list = task_list; list; list = list->next) {
  55                 struct dhclient_task *task = list->data;
  56
  57                 if (task->pid == pid)
  58                         return task;
  59         }
  60
  61         return NULL;
  62 }
  63
  64 static struct dhclient_task *find_task_by_index(int index)
  65 {
  66         GSList *list;
  67
  68         for (list = task_list; list; list = list->next) {
  69                 struct dhclient_task *task = list->data;
  70
  71                 if (task->ifindex == index)
  72                         return task;
  73         }
  74
  75         return NULL;
  76 }
  77
  78 static void kill_task(struct dhclient_task *task)
  79 {
  80         DBG("task %p name %s pid %d", task, task->ifname, task->pid);
  81
  82         if (task->pid > 0)
  83                 kill(task->pid, SIGTERM);
  84 }
  85
  86 static void unlink_task(struct dhclient_task *task)
  87 {
  88         gchar *pathname;
  89
  90         DBG("task %p name %s pid %d", task, task->ifname, task->pid);
  91
  92         pathname = g_strdup_printf("%s/dhclient.%s.pid",
  93                                                 STATEDIR, task->ifname);
  94         g_unlink(pathname);
  95         g_free(pathname);
  96
  97         pathname = g_strdup_printf("%s/dhclient.%s.leases",
  98                                                 STATEDIR, task->ifname);
  99         g_unlink(pathname);
 100         g_free(pathname);
 101 }
 102
 103 static void task_died(GPid pid, gint status, gpointer data)
 104 {
 105         struct dhclient_task *task = data;
 106
 107         if (WIFEXITED(status))
 108                 DBG("exit status %d for %s", WEXITSTATUS(status), task->ifname);
 109         else
 110                 DBG("signal %d killed %s", WTERMSIG(status), task->ifname);
 111
 112         g_spawn_close_pid(pid);
 113         task->pid = 0;
 114
 115         g_static_mutex_lock(&task_mutex);
 116         task_list = g_slist_remove(task_list, task);
 117         g_static_mutex_unlock(&task_mutex);
 118
 119         unlink_task(task);
 120
 121         g_free(task->ifname);
 122         g_free(task);
 123 }
 124
 125 static void task_setup(gpointer data)
 126 {
 127         struct dhclient_task *task = data;
 128
 129         DBG("task %p name %s", task, task->ifname);
 130 }
 131
 132 static int dhclient_probe(struct connman_element *element)
 133 {
 134         struct dhclient_task *task;
 135         char *argv[16], *envp[1], address[128], pidfile[PATH_MAX];
 136         char leases[PATH_MAX], config[PATH_MAX], script[PATH_MAX];
 137
 138         DBG("element %p name %s", element, element->name);
 139
 140         task = g_try_new0(struct dhclient_task, 1);
 141         if (task == NULL)
 142                 return -ENOMEM;
 143
 144         task->ifindex = element->netdev.index;
 145         task->ifname = g_strdup(element->netdev.name);
 146         task->element = element;
 147         task->child = NULL;
 148
 149         if (task->ifname == NULL) {
 150                 g_free(task);
 151                 return -ENOMEM;
 152         }
 153
 154         DBG("request %s", task->ifname);
 155
 156         snprintf(address, sizeof(address) - 1, "BUSNAME=%s", busname);
 157         snprintf(pidfile, sizeof(pidfile) - 1,
 158                         "%s/dhclient.%s.pid", STATEDIR, task->ifname);
 159         snprintf(leases, sizeof(leases) - 1,
 160                         "%s/dhclient.%s.leases", STATEDIR, task->ifname);
 161         snprintf(config, sizeof(config) - 1, "%s/dhclient.conf", SCRIPTDIR);
 162         snprintf(script, sizeof(script) - 1, "%s/dhclient-script", SCRIPTDIR);
 163
 164         argv[0] = DHCLIENT;
 165         argv[1] = "-d";
 166         argv[2] = "-q";
 167         argv[3] = "-n";
 168         argv[4] = "-e";
 169         argv[5] = address;
 170         argv[6] = "-pf";
 171         argv[7] = pidfile;
 172         argv[8] = "-lf";
 173         argv[9] = leases;
 174         argv[10] = "-cf";
 175         argv[11] = config;
 176         argv[12] = "-sf";
 177         argv[13] = script;
 178         argv[14] = task->ifname;
 179         argv[15] = NULL;
 180
 181         envp[0] = NULL;
 182
 183         if (g_spawn_async(NULL, argv, envp, G_SPAWN_DO_NOT_REAP_CHILD,
 184                                 task_setup, task, &task->pid, NULL) == FALSE) {
 185                 connman_error("Failed to spawn dhclient");
 186                 return -1;
 187         }
 188
 189         g_static_mutex_lock(&task_mutex);
 190         task_list = g_slist_append(task_list, task);
 191         g_static_mutex_unlock(&task_mutex);
 192
 193         g_child_watch_add(task->pid, task_died, task);
 194
 195         DBG("executed %s with pid %d", DHCLIENT, task->pid);
 196
 197         return 0;
 198 }
 199
 200 static void dhclient_remove(struct connman_element *element)
 201 {
 202         struct dhclient_task *task;
 203
 204         DBG("element %p name %s", element, element->name);
 205
 206         g_static_mutex_lock(&task_mutex);
 207         task = find_task_by_index(element->netdev.index);
 208         g_static_mutex_unlock(&task_mutex);
 209
 210         if (task == NULL)
 211                 return;
 212
 213         DBG("release %s", task->ifname);
 214
 215         g_static_mutex_lock(&task_mutex);
 216         task_list = g_slist_remove(task_list, task);
 217         g_static_mutex_unlock(&task_mutex);
 218
 219         if (task->child != NULL) {
 220                 connman_element_unregister(task->child);
 221                 connman_element_unref(task->child);
 222                 task->child = NULL;
 223         }
 224
 225         kill_task(task);
 226 }
 227
 228 static struct connman_driver dhclient_driver = {
 229         .name           = "dhclient",
 230         .type           = CONNMAN_ELEMENT_TYPE_DHCP,
 231         .probe          = dhclient_probe,
 232         .remove         = dhclient_remove,
 233 };
 234
 235 static DBusHandlerResult dhclient_filter(DBusConnection *conn,
 236                                                 DBusMessage *msg, void *data)
 237 {
 238         DBusMessageIter iter, dict;
 239         dbus_uint32_t pid;
 240         struct dhclient_task *task;
 241         const char *text, *key, *value;
 242
 243         if (dbus_message_is_method_call(msg, DHCLIENT_INTF, "notify") == FALSE)
 244                 return DBUS_HANDLER_RESULT_NOT_YET_HANDLED;
 245
 246         dbus_message_iter_init(msg, &iter);
 247
 248         dbus_message_iter_get_basic(&iter, &pid);
 249         dbus_message_iter_next(&iter);
 250
 251         dbus_message_iter_get_basic(&iter, &text);
 252         dbus_message_iter_next(&iter);
 253
 254         DBG("change %d to %s", pid, text);
 255
 256         g_static_mutex_lock(&task_mutex);
 257         task = find_task_by_pid(pid);
 258         g_static_mutex_unlock(&task_mutex);
 259
 260         if (task == NULL)
 261                 return DBUS_HANDLER_RESULT_NOT_YET_HANDLED;
 262
 263         dbus_message_iter_recurse(&iter, &dict);
 264
 265         while (dbus_message_iter_get_arg_type(&dict) == DBUS_TYPE_DICT_ENTRY) {
 266                 DBusMessageIter entry;
 267
 268                 dbus_message_iter_recurse(&dict, &entry);
 269                 dbus_message_iter_get_basic(&entry, &key);
 270                 dbus_message_iter_next(&entry);
 271                 dbus_message_iter_get_basic(&entry, &value);
 272
 273                 DBG("%s = %s", key, value);
 274
 275                 if (g_ascii_strcasecmp(key, "new_ip_address") == 0) {
 276                         g_free(task->element->ipv4.address);
 277                         task->element->ipv4.address = g_strdup(value);
 278                 }
 279
 280                 if (g_ascii_strcasecmp(key, "new_subnet_mask") == 0) {
 281                         g_free(task->element->ipv4.netmask);
 282                         task->element->ipv4.netmask = g_strdup(value);
 283                 }
 284
 285                 if (g_ascii_strcasecmp(key, "new_routers") == 0) {
 286                         g_free(task->element->ipv4.gateway);
 287                         task->element->ipv4.gateway = g_strdup(value);
 288                 }
 289
 290                 if (g_ascii_strcasecmp(key, "new_network_number") == 0) {
 291                         g_free(task->element->ipv4.network);
 292                         task->element->ipv4.network = g_strdup(value);
 293                 }
 294
 295                 if (g_ascii_strcasecmp(key, "new_broadcast_address") == 0) {
 296                         g_free(task->element->ipv4.broadcast);
 297                         task->element->ipv4.broadcast = g_strdup(value);
 298                 }
 299
 300                 if (g_ascii_strcasecmp(key, "new_domain_name_servers") == 0) {
 301                         g_free(task->element->ipv4.nameserver);
 302                         task->element->ipv4.nameserver = g_strdup(value);
 303                 }
 304
 305                 dbus_message_iter_next(&dict);
 306         }
 307
 308         if (g_ascii_strcasecmp(text, "PREINIT") == 0) {
 309         } else if (g_ascii_strcasecmp(text, "BOUND") == 0 ||
 310                                 g_ascii_strcasecmp(text, "REBOOT") == 0) {
 311                 task->child = connman_element_create();
 312                 task->child->type = CONNMAN_ELEMENT_TYPE_IPV4;
 313                 task->child->netdev.index = task->ifindex;
 314                 connman_element_update(task->element);
 315                 connman_element_register(task->child, task->element);
 316         } else if (g_ascii_strcasecmp(text, "RENEW") == 0 ||
 317                                 g_ascii_strcasecmp(text, "REBIND") == 0) {
 318                 connman_element_update(task->element);
 319                 connman_element_update(task->child);
 320         } else {
 321         }
 322
 323         return DBUS_HANDLER_RESULT_HANDLED;
 324 }
 325
 326 static DBusConnection *connection;
 327
 328 static int dhclient_init(void)
 329 {
 330         gchar *filter;
 331         int err;
 332
 333         connection = dbus_bus_get(DBUS_BUS_SYSTEM, NULL);
 334
 335         busname = dbus_bus_get_unique_name(connection);
 336         busname = CONNMAN_SERVICE;
 337
 338         dbus_connection_add_filter(connection, dhclient_filter, NULL, NULL);
 339
 340         filter = g_strdup_printf("interface=%s,path=%s",
 341                                                 DHCLIENT_INTF, DHCLIENT_PATH);
 342
 343         dbus_bus_add_match(connection, filter, NULL);
 344
 345         g_free(filter);
 346
 347         err = connman_driver_register(&dhclient_driver);
 348         if (err < 0) {
 349                 dbus_connection_unref(connection);
 350                 return err;
 351         }
 352
 353         return 0;
 354 }
 355
 356 static void dhclient_exit(void)
 357 {
 358         GSList *list;
 359
 360         g_static_mutex_lock(&task_mutex);
 361
 362         for (list = task_list; list; list = list->next) {
 363                 struct dhclient_task *task = list->data;
 364
 365                 if (task->child) {
 366                         connman_element_unregister(task->child);
 367                         connman_element_unref(task->child);
 368                         task->child = NULL;
 369                 }
 370
 371                 DBG("killing process %d", task->pid);
 372
 373                 kill_task(task);
 374                 unlink_task(task);
 375         }
 376
 377         g_static_mutex_unlock(&task_mutex);
 378
 379         g_slist_free(task_list);
 380
 381         connman_driver_unregister(&dhclient_driver);
 382
 383         dbus_connection_unref(connection);
 384 }
 385
 386 CONNMAN_PLUGIN_DEFINE("dhclient", "ISC DHCP client plugin", VERSION,
 387                                                 dhclient_init, dhclient_exit)