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 #include "inet.h"
  35
  36 #define DHCLIENT_INTF "org.isc.dhclient"
  37 #define DHCLIENT_PATH "/org/isc/dhclient"
  38
  39 static const char *busname;
  40
  41 struct dhclient_task {
  42         GPid pid;
  43         int ifindex;
  44         gchar *ifname;
  45         struct connman_element *element;
  46 };
  47
  48 static GStaticMutex task_mutex = G_STATIC_MUTEX_INIT;
  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         g_static_mutex_lock(&task_mutex);
 117         task_list = g_slist_remove(task_list, task);
 118         g_static_mutex_unlock(&task_mutex);
 119
 120         unlink_task(task);
 121
 122         g_free(task->ifname);
 123         g_free(task);
 124 }
 125
 126 static void task_setup(gpointer data)
 127 {
 128         struct dhclient_task *task = data;
 129
 130         DBG("task %p name %s", task, task->ifname);
 131 }
 132
 133 static int dhclient_probe(struct connman_element *element)
 134 {
 135         struct dhclient_task *task;
 136         char *argv[16], *envp[1], address[128], pidfile[PATH_MAX];
 137         char leases[PATH_MAX], config[PATH_MAX], script[PATH_MAX];
 138
 139         DBG("element %p name %s", element, element->name);
 140
 141         task = g_try_new0(struct dhclient_task, 1);
 142         if (task == NULL)
 143                 return -ENOMEM;
 144
 145         task->ifindex = element->index;
 146         task->ifname = inet_index2name(element->index);
 147         task->element = element;
 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
 208         task = find_task_by_index(element->index);
 209         if (task != NULL)
 210                 task_list = g_slist_remove(task_list, task);
 211
 212         g_static_mutex_unlock(&task_mutex);
 213
 214         if (task == NULL)
 215                 return;
 216
 217         DBG("release %s", task->ifname);
 218
 219         kill_task(task);
 220 }
 221
 222 static struct connman_driver dhclient_driver = {
 223         .name           = "dhclient",
 224         .type           = CONNMAN_ELEMENT_TYPE_DHCP,
 225         .probe          = dhclient_probe,
 226         .remove         = dhclient_remove,
 227 };
 228
 229 static DBusHandlerResult dhclient_filter(DBusConnection *conn,
 230                                                 DBusMessage *msg, void *data)
 231 {
 232         DBusMessageIter iter, dict;
 233         dbus_uint32_t pid;
 234         struct dhclient_task *task;
 235         const char *text, *key, *value;
 236
 237         if (dbus_message_is_method_call(msg, DHCLIENT_INTF, "notify") == FALSE)
 238                 return DBUS_HANDLER_RESULT_NOT_YET_HANDLED;
 239
 240         dbus_message_iter_init(msg, &iter);
 241
 242         dbus_message_iter_get_basic(&iter, &pid);
 243         dbus_message_iter_next(&iter);
 244
 245         dbus_message_iter_get_basic(&iter, &text);
 246         dbus_message_iter_next(&iter);
 247
 248         DBG("change %d to %s", pid, text);
 249
 250         g_static_mutex_lock(&task_mutex);
 251         task = find_task_by_pid(pid);
 252         g_static_mutex_unlock(&task_mutex);
 253
 254         if (task == NULL)
 255                 return DBUS_HANDLER_RESULT_NOT_YET_HANDLED;
 256
 257         dbus_message_iter_recurse(&iter, &dict);
 258
 259         while (dbus_message_iter_get_arg_type(&dict) == DBUS_TYPE_DICT_ENTRY) {
 260                 DBusMessageIter entry;
 261
 262                 dbus_message_iter_recurse(&dict, &entry);
 263                 dbus_message_iter_get_basic(&entry, &key);
 264                 dbus_message_iter_next(&entry);
 265                 dbus_message_iter_get_basic(&entry, &value);
 266
 267                 DBG("%s = %s", key, value);
 268
 269                 if (g_ascii_strcasecmp(key, "new_ip_address") == 0) {
 270                         g_free(task->element->ipv4.address);
 271                         task->element->ipv4.address = g_strdup(value);
 272                 }
 273
 274                 if (g_ascii_strcasecmp(key, "new_subnet_mask") == 0) {
 275                         g_free(task->element->ipv4.netmask);
 276                         task->element->ipv4.netmask = g_strdup(value);
 277                 }
 278
 279                 if (g_ascii_strcasecmp(key, "new_routers") == 0) {
 280                         g_free(task->element->ipv4.gateway);
 281                         task->element->ipv4.gateway = g_strdup(value);
 282                 }
 283
 284                 if (g_ascii_strcasecmp(key, "new_network_number") == 0) {
 285                         g_free(task->element->ipv4.network);
 286                         task->element->ipv4.network = g_strdup(value);
 287                 }
 288
 289                 if (g_ascii_strcasecmp(key, "new_broadcast_address") == 0) {
 290                         g_free(task->element->ipv4.broadcast);
 291                         task->element->ipv4.broadcast = g_strdup(value);
 292                 }
 293
 294                 if (g_ascii_strcasecmp(key, "new_domain_name_servers") == 0) {
 295                         g_free(task->element->ipv4.nameserver);
 296                         task->element->ipv4.nameserver = g_strdup(value);
 297                 }
 298
 299                 dbus_message_iter_next(&dict);
 300         }
 301
 302         if (g_ascii_strcasecmp(text, "PREINIT") == 0) {
 303         } else if (g_ascii_strcasecmp(text, "BOUND") == 0 ||
 304                                 g_ascii_strcasecmp(text, "REBOOT") == 0) {
 305                 struct connman_element *element;
 306                 element = connman_element_create(NULL);
 307                 element->type = CONNMAN_ELEMENT_TYPE_IPV4;
 308                 element->index = task->ifindex;
 309                 connman_element_update(task->element);
 310                 connman_element_register(element, task->element);
 311         } else if (g_ascii_strcasecmp(text, "RENEW") == 0 ||
 312                                 g_ascii_strcasecmp(text, "REBIND") == 0) {
 313                 connman_element_update(task->element);
 314         } else {
 315         }
 316
 317         return DBUS_HANDLER_RESULT_HANDLED;
 318 }
 319
 320 static DBusConnection *connection;
 321
 322 static int dhclient_init(void)
 323 {
 324         gchar *filter;
 325         int err;
 326
 327         connection = dbus_bus_get(DBUS_BUS_SYSTEM, NULL);
 328
 329         busname = dbus_bus_get_unique_name(connection);
 330         busname = CONNMAN_SERVICE;
 331
 332         dbus_connection_add_filter(connection, dhclient_filter, NULL, NULL);
 333
 334         filter = g_strdup_printf("interface=%s,path=%s",
 335                                                 DHCLIENT_INTF, DHCLIENT_PATH);
 336
 337         dbus_bus_add_match(connection, filter, NULL);
 338
 339         g_free(filter);
 340
 341         err = connman_driver_register(&dhclient_driver);
 342         if (err < 0) {
 343                 dbus_connection_unref(connection);
 344                 return err;
 345         }
 346
 347         return 0;
 348 }
 349
 350 static void dhclient_exit(void)
 351 {
 352         GSList *list;
 353
 354         g_static_mutex_lock(&task_mutex);
 355
 356         for (list = task_list; list; list = list->next) {
 357                 struct dhclient_task *task = list->data;
 358
 359                 DBG("killing process %d", task->pid);
 360
 361                 kill_task(task);
 362                 unlink_task(task);
 363         }
 364
 365         g_static_mutex_unlock(&task_mutex);
 366
 367         g_slist_free(task_list);
 368
 369         connman_driver_unregister(&dhclient_driver);
 370
 371         dbus_connection_unref(connection);
 372 }
 373
 374 CONNMAN_PLUGIN_DEFINE("dhclient", "ISC DHCP client plugin", VERSION,
 375                                                 dhclient_init, dhclient_exit)