git.maemo.org Git - connman/blob - 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 *parent;
  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->parent = 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         connman_element_unregister(task->child);
 220         connman_element_unref(task->child);
 221         task->child = NULL;
 222
 223         kill_task(task);
 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 };
 232
 233 static void copy_ipv4(struct connman_element *src, struct connman_element *dst)
 234 {
 235         g_free(dst->ipv4.address);
 236         g_free(dst->ipv4.netmask);
 237         g_free(dst->ipv4.gateway);
 238         g_free(dst->ipv4.network);
 239         g_free(dst->ipv4.broadcast);
 240         g_free(dst->ipv4.nameserver);
 241
 242         dst->ipv4.address = g_strdup(src->ipv4.address);
 243         dst->ipv4.netmask = g_strdup(src->ipv4.netmask);
 244         dst->ipv4.gateway = g_strdup(src->ipv4.gateway);
 245         dst->ipv4.network = g_strdup(src->ipv4.network);
 246         dst->ipv4.broadcast = g_strdup(src->ipv4.broadcast);
 247         dst->ipv4.nameserver = g_strdup(src->ipv4.nameserver);
 248 }
 249
 250 static DBusHandlerResult dhclient_filter(DBusConnection *conn,
 251                                                 DBusMessage *msg, void *data)
 252 {
 253         DBusMessageIter iter, dict;
 254         dbus_uint32_t pid;
 255         struct dhclient_task *task;
 256         const char *text, *key, *value;
 257
 258         if (dbus_message_is_method_call(msg, DHCLIENT_INTF, "notify") == FALSE)
 259                 return DBUS_HANDLER_RESULT_NOT_YET_HANDLED;
 260
 261         dbus_message_iter_init(msg, &iter);
 262
 263         dbus_message_iter_get_basic(&iter, &pid);
 264         dbus_message_iter_next(&iter);
 265
 266         dbus_message_iter_get_basic(&iter, &text);
 267         dbus_message_iter_next(&iter);
 268
 269         DBG("change %d to %s", pid, text);
 270
 271         g_static_mutex_lock(&task_mutex);
 272         task = find_task_by_pid(pid);
 273         g_static_mutex_unlock(&task_mutex);
 274
 275         if (task == NULL)
 276                 return DBUS_HANDLER_RESULT_NOT_YET_HANDLED;
 277
 278         dbus_message_iter_recurse(&iter, &dict);
 279
 280         while (dbus_message_iter_get_arg_type(&dict) == DBUS_TYPE_DICT_ENTRY) {
 281                 DBusMessageIter entry;
 282
 283                 dbus_message_iter_recurse(&dict, &entry);
 284                 dbus_message_iter_get_basic(&entry, &key);
 285                 dbus_message_iter_next(&entry);
 286                 dbus_message_iter_get_basic(&entry, &value);
 287
 288                 DBG("%s = %s", key, value);
 289
 290                 if (g_ascii_strcasecmp(key, "new_ip_address") == 0)
 291                         task->parent->ipv4.address = g_strdup(value);
 292
 293                 if (g_ascii_strcasecmp(key, "new_subnet_mask") == 0)
 294                         task->parent->ipv4.netmask = g_strdup(value);
 295
 296                 if (g_ascii_strcasecmp(key, "new_routers") == 0)
 297                         task->parent->ipv4.gateway = g_strdup(value);
 298
 299                 if (g_ascii_strcasecmp(key, "new_network_number") == 0)
 300                         task->parent->ipv4.network = g_strdup(value);
 301
 302                 if (g_ascii_strcasecmp(key, "new_broadcast_address") == 0)
 303                         task->parent->ipv4.broadcast = g_strdup(value);
 304
 305                 if (g_ascii_strcasecmp(key, "new_domain_name_servers") == 0)
 306                         task->parent->ipv4.nameserver = g_strdup(value);
 307
 308                 dbus_message_iter_next(&dict);
 309         }
 310
 311         if (g_ascii_strcasecmp(text, "PREINIT") == 0) {
 312         } else if (g_ascii_strcasecmp(text, "BOUND") == 0 ||
 313                                 g_ascii_strcasecmp(text, "REBOOT") == 0) {
 314                 task->child = connman_element_create();
 315                 task->child->type = CONNMAN_ELEMENT_TYPE_IPV4;
 316                 task->child->netdev.index = task->ifindex;
 317                 copy_ipv4(task->parent, task->child);
 318                 connman_element_register(task->child, task->parent);
 319         } else if (g_ascii_strcasecmp(text, "RENEW") == 0 ||
 320                                 g_ascii_strcasecmp(text, "REBIND") == 0) {
 321                 copy_ipv4(task->parent, task->child);
 322                 connman_element_update(task->child);
 323         } else {
 324         }
 325
 326         return DBUS_HANDLER_RESULT_HANDLED;
 327 }
 328
 329 static DBusConnection *connection;
 330
 331 static int dhclient_init(void)
 332 {
 333         gchar *filter;
 334         int err;
 335
 336         connection = dbus_bus_get(DBUS_BUS_SYSTEM, NULL);
 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         filter = g_strdup_printf("interface=%s,path=%s",
 344                                                 DHCLIENT_INTF, DHCLIENT_PATH);
 345
 346         dbus_bus_add_match(connection, filter, NULL);
 347
 348         g_free(filter);
 349
 350         err = connman_driver_register(&dhclient_driver);
 351         if (err < 0) {
 352                 dbus_connection_unref(connection);
 353                 return err;
 354         }
 355
 356         return 0;
 357 }
 358
 359 static void dhclient_exit(void)
 360 {
 361         GSList *list;
 362
 363         g_static_mutex_lock(&task_mutex);
 364
 365         for (list = task_list; list; list = list->next) {
 366                 struct dhclient_task *task = list->data;
 367
 368                 if (task->child) {
 369                         connman_element_unregister(task->child);
 370                         connman_element_unref(task->child);
 371                         task->child = NULL;
 372                 }
 373
 374                 DBG("killing process %d", task->pid);
 375
 376                 kill_task(task);
 377                 unlink_task(task);
 378         }
 379
 380         g_static_mutex_unlock(&task_mutex);
 381
 382         g_slist_free(task_list);
 383
 384         connman_driver_unregister(&dhclient_driver);
 385
 386         dbus_connection_unref(connection);
 387 }
 388
 389 CONNMAN_PLUGIN_DEFINE("dhclient", "ISC DHCP client plugin", VERSION,
 390                                                 dhclient_init, dhclient_exit)