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