git.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/dbus.h>
  34 #include <connman/log.h>
  35
  36 #include "inet.h"
  37
  38 #define DHCLIENT_INTF "org.isc.dhclient"
  39 #define DHCLIENT_PATH "/org/isc/dhclient"
  40
  41 static const char *busname;
  42
  43 struct dhclient_task {
  44         GPid pid;
  45         int ifindex;
  46         gchar *ifname;
  47         struct connman_element *element;
  48 };
  49
  50 static GSList *task_list = NULL;
  51
  52 static struct dhclient_task *find_task_by_pid(GPid pid)
  53 {
  54         GSList *list;
  55
  56         for (list = task_list; list; list = list->next) {
  57                 struct dhclient_task *task = list->data;
  58
  59                 if (task->pid == pid)
  60                         return task;
  61         }
  62
  63         return NULL;
  64 }
  65
  66 static struct dhclient_task *find_task_by_index(int index)
  67 {
  68         GSList *list;
  69
  70         for (list = task_list; list; list = list->next) {
  71                 struct dhclient_task *task = list->data;
  72
  73                 if (task->ifindex == index)
  74                         return task;
  75         }
  76
  77         return NULL;
  78 }
  79
  80 static void kill_task(struct dhclient_task *task)
  81 {
  82         DBG("task %p name %s pid %d", task, task->ifname, task->pid);
  83
  84         if (task->pid > 0)
  85                 kill(task->pid, SIGTERM);
  86 }
  87
  88 static void unlink_task(struct dhclient_task *task)
  89 {
  90         gchar *pathname;
  91
  92         DBG("task %p name %s pid %d", task, task->ifname, task->pid);
  93
  94         pathname = g_strdup_printf("%s/dhclient.%s.pid",
  95                                                 STATEDIR, task->ifname);
  96         g_unlink(pathname);
  97         g_free(pathname);
  98
  99         pathname = g_strdup_printf("%s/dhclient.%s.leases",
 100                                                 STATEDIR, task->ifname);
 101         g_unlink(pathname);
 102         g_free(pathname);
 103 }
 104
 105 static void task_died(GPid pid, gint status, gpointer data)
 106 {
 107         struct dhclient_task *task = data;
 108
 109         if (WIFEXITED(status))
 110                 DBG("exit status %d for %s", WEXITSTATUS(status), task->ifname);
 111         else
 112                 DBG("signal %d killed %s", WTERMSIG(status), task->ifname);
 113
 114         g_spawn_close_pid(pid);
 115         task->pid = 0;
 116
 117         task_list = g_slist_remove(task_list, task);
 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         if (access(DHCLIENT, X_OK) < 0)
 141                 return -errno;
 142
 143         task = g_try_new0(struct dhclient_task, 1);
 144         if (task == NULL)
 145                 return -ENOMEM;
 146
 147         task->ifindex = element->index;
 148         task->ifname = inet_index2name(element->index);
 149         task->element = element;
 150
 151         if (task->ifname == NULL) {
 152                 g_free(task);
 153                 return -ENOMEM;
 154         }
 155
 156         DBG("request %s", task->ifname);
 157
 158         snprintf(address, sizeof(address) - 1, "BUSNAME=%s", busname);
 159         snprintf(pidfile, sizeof(pidfile) - 1,
 160                         "%s/dhclient.%s.pid", STATEDIR, task->ifname);
 161         snprintf(leases, sizeof(leases) - 1,
 162                         "%s/dhclient.%s.leases", STATEDIR, task->ifname);
 163         snprintf(config, sizeof(config) - 1, "%s/dhclient.conf", SCRIPTDIR);
 164         snprintf(script, sizeof(script) - 1, "%s/dhclient-script", SCRIPTDIR);
 165
 166         argv[0] = DHCLIENT;
 167         argv[1] = "-d";
 168         argv[2] = "-q";
 169         argv[3] = "-n";
 170         argv[4] = "-e";
 171         argv[5] = address;
 172         argv[6] = "-pf";
 173         argv[7] = pidfile;
 174         argv[8] = "-lf";
 175         argv[9] = leases;
 176         argv[10] = "-cf";
 177         argv[11] = config;
 178         argv[12] = "-sf";
 179         argv[13] = script;
 180         argv[14] = task->ifname;
 181         argv[15] = NULL;
 182
 183         envp[0] = NULL;
 184
 185         if (g_spawn_async(NULL, argv, envp, G_SPAWN_DO_NOT_REAP_CHILD,
 186                                 task_setup, task, &task->pid, NULL) == FALSE) {
 187                 connman_error("Failed to spawn dhclient");
 188                 return -1;
 189         }
 190
 191         task_list = g_slist_append(task_list, task);
 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         task = find_task_by_index(element->index);
 207         if (task != NULL)
 208                 task_list = g_slist_remove(task_list, task);
 209
 210         if (task == NULL)
 211                 return;
 212
 213         DBG("release %s", task->ifname);
 214
 215         kill_task(task);
 216 }
 217
 218 static void dhclient_change(struct connman_element *element)
 219 {
 220         DBG("element %p name %s", element, element->name);
 221
 222         if (element->state == CONNMAN_ELEMENT_STATE_ERROR)
 223                 connman_element_set_error(element->parent,
 224                                         CONNMAN_ELEMENT_ERROR_DHCP_FAILED);
 225 }
 226
 227 static struct connman_driver dhclient_driver = {
 228         .name           = "dhclient",
 229         .type           = CONNMAN_ELEMENT_TYPE_DHCP,
 230         .probe          = dhclient_probe,
 231         .remove         = dhclient_remove,
 232         .change         = dhclient_change,
 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         task = find_task_by_pid(pid);
 257
 258         if (task == NULL)
 259                 return DBUS_HANDLER_RESULT_NOT_YET_HANDLED;
 260
 261         dbus_message_iter_recurse(&iter, &dict);
 262
 263         while (dbus_message_iter_get_arg_type(&dict) == DBUS_TYPE_DICT_ENTRY) {
 264                 DBusMessageIter entry;
 265
 266                 dbus_message_iter_recurse(&dict, &entry);
 267                 dbus_message_iter_get_basic(&entry, &key);
 268                 dbus_message_iter_next(&entry);
 269                 dbus_message_iter_get_basic(&entry, &value);
 270
 271                 DBG("%s = %s", key, value);
 272
 273                 if (g_ascii_strcasecmp(key, "new_ip_address") == 0) {
 274                         g_free(task->element->ipv4.address);
 275                         task->element->ipv4.address = g_strdup(value);
 276                 }
 277
 278                 if (g_ascii_strcasecmp(key, "new_subnet_mask") == 0) {
 279                         g_free(task->element->ipv4.netmask);
 280                         task->element->ipv4.netmask = g_strdup(value);
 281                 }
 282
 283                 if (g_ascii_strcasecmp(key, "new_routers") == 0) {
 284                         g_free(task->element->ipv4.gateway);
 285                         task->element->ipv4.gateway = g_strdup(value);
 286                 }
 287
 288                 if (g_ascii_strcasecmp(key, "new_network_number") == 0) {
 289                         g_free(task->element->ipv4.network);
 290                         task->element->ipv4.network = g_strdup(value);
 291                 }
 292
 293                 if (g_ascii_strcasecmp(key, "new_broadcast_address") == 0) {
 294                         g_free(task->element->ipv4.broadcast);
 295                         task->element->ipv4.broadcast = g_strdup(value);
 296                 }
 297
 298                 if (g_ascii_strcasecmp(key, "new_domain_name_servers") == 0) {
 299                         g_free(task->element->ipv4.nameserver);
 300                         task->element->ipv4.nameserver = g_strdup(value);
 301                 }
 302
 303                 dbus_message_iter_next(&dict);
 304         }
 305
 306         if (g_ascii_strcasecmp(text, "PREINIT") == 0) {
 307         } else if (g_ascii_strcasecmp(text, "BOUND") == 0 ||
 308                                 g_ascii_strcasecmp(text, "REBOOT") == 0) {
 309                 struct connman_element *element;
 310                 element = connman_element_create(NULL);
 311                 element->type = CONNMAN_ELEMENT_TYPE_IPV4;
 312                 element->index = task->ifindex;
 313                 connman_element_update(task->element);
 314                 if (connman_element_register(element, task->element) < 0)
 315                         connman_element_unref(element);
 316         } else if (g_ascii_strcasecmp(text, "RENEW") == 0 ||
 317                                 g_ascii_strcasecmp(text, "REBIND") == 0) {
 318                 connman_element_update(task->element);
 319         } else if (g_ascii_strcasecmp(text, "FAIL") == 0) {
 320                 connman_element_set_error(task->element,
 321                                                 CONNMAN_ELEMENT_ERROR_FAILED);
 322         } else {
 323         }
 324
 325         return DBUS_HANDLER_RESULT_HANDLED;
 326 }
 327
 328 static DBusConnection *connection;
 329
 330 static const char *dhclient_rule = "path=" DHCLIENT_PATH
 331                                                 ",interface=" DHCLIENT_INTF;
 332
 333 static int dhclient_init(void)
 334 {
 335         int err;
 336
 337         connection = connman_dbus_get_connection();
 338
 339         busname = dbus_bus_get_unique_name(connection);
 340         busname = CONNMAN_SERVICE;
 341
 342         dbus_connection_add_filter(connection, dhclient_filter, NULL, NULL);
 343
 344         dbus_bus_add_match(connection, dhclient_rule, NULL);
 345
 346         err = connman_driver_register(&dhclient_driver);
 347         if (err < 0) {
 348                 dbus_connection_unref(connection);
 349                 return err;
 350         }
 351
 352         return 0;
 353 }
 354
 355 static void dhclient_exit(void)
 356 {
 357         GSList *list;
 358
 359         for (list = task_list; list; list = list->next) {
 360                 struct dhclient_task *task = list->data;
 361
 362                 DBG("killing process %d", task->pid);
 363
 364                 kill_task(task);
 365                 unlink_task(task);
 366         }
 367
 368         g_slist_free(task_list);
 369
 370         connman_driver_unregister(&dhclient_driver);
 371
 372         dbus_bus_remove_match(connection, dhclient_rule, NULL);
 373
 374         dbus_connection_remove_filter(connection, dhclient_filter, NULL);
 375
 376         dbus_connection_unref(connection);
 377 }
 378
 379 CONNMAN_PLUGIN_DEFINE(dhclient, "ISC DHCP client plugin", VERSION,
 380                 CONNMAN_PLUGIN_PRIORITY_DEFAULT, dhclient_init, dhclient_exit)