git.maemo.org Git - connman/blob - plugins/dhclient.c

   1 /*
   2  *
   3  *  Connection Manager
   4  *
   5  *  Copyright (C) 2007  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 <stdio.h>
  27 #include <errno.h>
  28 #include <unistd.h>
  29 #include <stdlib.h>
  30 #include <signal.h>
  31 #include <string.h>
  32 #include <sys/wait.h>
  33 #include <sys/ioctl.h>
  34 #include <sys/socket.h>
  35 #include <arpa/inet.h>
  36 #include <net/if.h>
  37
  38 #include <glib.h>
  39 #include <gdbus.h>
  40
  41 #include <connman/plugin.h>
  42 #include <connman/dhcp.h>
  43
  44 #define DHCLIENT_INTF "org.isc.dhclient"
  45 #define DHCLIENT_PATH "/org/isc/dhclient"
  46
  47 static const char *busname;
  48
  49 struct dhclient_task {
  50         GPid pid;
  51         int ifindex;
  52         char *ifname;
  53         struct connman_iface *iface;
  54 };
  55
  56 static GSList *tasks = NULL;
  57
  58 static struct dhclient_task *find_task_by_pid(GPid pid)
  59 {
  60         GSList *list;
  61
  62         for (list = tasks; list; list = list->next) {
  63                 struct dhclient_task *task = list->data;
  64
  65                 if (task->pid == pid)
  66                         return task;
  67         }
  68
  69         return NULL;
  70 }
  71
  72 static struct dhclient_task *find_task_by_index(int index)
  73 {
  74         GSList *list;
  75
  76         for (list = tasks; list; list = list->next) {
  77                 struct dhclient_task *task = list->data;
  78
  79                 if (task->ifindex == index)
  80                         return task;
  81         }
  82
  83         return NULL;
  84 }
  85
  86 static void kill_task(struct dhclient_task *task)
  87 {
  88         char pathname[PATH_MAX];
  89
  90         if (task->pid > 0)
  91                 kill(task->pid, SIGTERM);
  92
  93         snprintf(pathname, sizeof(pathname) - 1,
  94                         "%s/dhclient.%s.pid", STATEDIR, task->ifname);
  95         unlink(pathname);
  96
  97         snprintf(pathname, sizeof(pathname) - 1,
  98                         "%s/dhclient.%s.leases", STATEDIR, task->ifname);
  99         unlink(pathname);
 100
 101         free(task->ifname);
 102
 103         g_free(task);
 104 }
 105
 106 static void task_died(GPid pid, gint status, gpointer data)
 107 {
 108         struct dhclient_task *task = data;
 109
 110         if (WIFEXITED(status))
 111                 printf("[DHCP] exit status %d for %s\n",
 112                                         WEXITSTATUS(status), task->ifname);
 113         else
 114                 printf("[DHCP] signal %d killed %s\n",
 115                                         WTERMSIG(status), task->ifname);
 116
 117         g_spawn_close_pid(pid);
 118         task->pid = 0;
 119
 120         tasks = g_slist_remove(tasks, task);
 121
 122         kill_task(task);
 123 }
 124
 125 static void task_setup(gpointer data)
 126 {
 127         struct dhclient_task *task = data;
 128
 129         printf("[DHCP] setup %s\n", task->ifname);
 130 }
 131
 132 static int dhclient_request(struct connman_iface *iface)
 133 {
 134         struct ifreq ifr;
 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         int sk, err;
 139
 140         sk = socket(PF_INET, SOCK_DGRAM, 0);
 141         if (sk < 0)
 142                 return -EIO;
 143
 144         memset(&ifr, 0, sizeof(ifr));
 145         ifr.ifr_ifindex = iface->index;
 146
 147         err = ioctl(sk, SIOCGIFNAME, &ifr);
 148
 149         close(sk);
 150
 151         if (err < 0)
 152                 return -EIO;
 153
 154         task = g_try_new0(struct dhclient_task, 1);
 155         if (task == NULL)
 156                 return -ENOMEM;
 157
 158         task->ifindex = iface->index;
 159         task->ifname = strdup(ifr.ifr_name);
 160         task->iface = iface;
 161
 162         if (task->ifname == NULL) {
 163                 g_free(task);
 164                 return -ENOMEM;
 165         }
 166
 167         printf("[DHCP] request %s\n", task->ifname);
 168
 169         snprintf(address, sizeof(address) - 1, "BUSNAME=%s", busname);
 170         snprintf(pidfile, sizeof(pidfile) - 1,
 171                         "%s/dhclient.%s.pid", STATEDIR, task->ifname);
 172         snprintf(leases, sizeof(leases) - 1,
 173                         "%s/dhclient.%s.leases", STATEDIR, task->ifname);
 174         snprintf(config, sizeof(config) - 1, "%s/dhclient.conf", SCRIPTDIR);
 175         snprintf(script, sizeof(script) - 1, "%s/dhclient-script", SCRIPTDIR);
 176
 177         argv[0] = DHCLIENT;
 178         argv[1] = "-d";
 179         argv[2] = "-q";
 180         argv[3] = "-n";
 181         argv[4] = "-e";
 182         argv[5] = address;
 183         argv[6] = "-pf";
 184         argv[7] = pidfile;
 185         argv[8] = "-lf";
 186         argv[9] = leases;
 187         argv[10] = "-cf";
 188         argv[11] = config;
 189         argv[12] = "-sf";
 190         argv[13] = script;
 191         argv[14] = task->ifname;
 192         argv[15] = NULL;
 193
 194         envp[0] = NULL;
 195
 196         if (g_spawn_async(NULL, argv, envp, G_SPAWN_DO_NOT_REAP_CHILD,
 197                                 task_setup, task, &task->pid, NULL) == FALSE) {
 198                 printf("Failed to spawn dhclient\n");
 199                 return -1;
 200         }
 201
 202         tasks = g_slist_append(tasks, task);
 203
 204         g_child_watch_add(task->pid, task_died, task);
 205
 206         printf("[DHCP] executed %s with pid %d\n", DHCLIENT, task->pid);
 207
 208         return 0;
 209 }
 210
 211 static int dhclient_release(struct connman_iface *iface)
 212 {
 213         struct dhclient_task *task;
 214
 215         task = find_task_by_index(iface->index);
 216         if (task == NULL)
 217                 return -ENODEV;
 218
 219         printf("[DHCP] release %s\n", task->ifname);
 220
 221         tasks = g_slist_remove(tasks, task);
 222
 223         kill_task(task);
 224
 225         return 0;
 226 }
 227
 228 static struct connman_dhcp_driver dhclient_driver = {
 229         .name           = "dhclient",
 230         .request        = dhclient_request,
 231         .release        = dhclient_release,
 232 };
 233
 234 static DBusHandlerResult dhclient_filter(DBusConnection *conn,
 235                                                 DBusMessage *msg, void *data)
 236 {
 237         DBusMessageIter iter, dict;
 238         dbus_uint32_t pid;
 239         struct dhclient_task *task;
 240         struct connman_ipv4 ipv4;
 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         memset(&ipv4, 0, sizeof(ipv4));
 247
 248         dbus_message_iter_init(msg, &iter);
 249
 250         dbus_message_iter_get_basic(&iter, &pid);
 251         dbus_message_iter_next(&iter);
 252
 253         dbus_message_iter_get_basic(&iter, &text);
 254         dbus_message_iter_next(&iter);
 255
 256         printf("[DHCP] change %d to %s\n", pid, text);
 257
 258         task = find_task_by_pid(pid);
 259         if (task == NULL)
 260                 return DBUS_HANDLER_RESULT_NOT_YET_HANDLED;
 261
 262         dbus_message_iter_recurse(&iter, &dict);
 263
 264         while (dbus_message_iter_get_arg_type(&dict) == DBUS_TYPE_DICT_ENTRY) {
 265                 DBusMessageIter entry;
 266
 267                 dbus_message_iter_recurse(&dict, &entry);
 268                 dbus_message_iter_get_basic(&entry, &key);
 269                 dbus_message_iter_next(&entry);
 270                 dbus_message_iter_get_basic(&entry, &value);
 271
 272                 printf("[DHCP] %s = %s\n", key, value);
 273
 274                 if (strcmp(key, "new_ip_address") == 0)
 275                         inet_aton(value, &ipv4.address);
 276
 277                 if (strcmp(key, "new_subnet_mask") == 0)
 278                         inet_aton(value, &ipv4.netmask);
 279
 280                 if (strcmp(key, "new_routers") == 0)
 281                         inet_aton(value, &ipv4.gateway);
 282
 283                 if (strcmp(key, "new_network_number") == 0)
 284                         inet_aton(value, &ipv4.network);
 285
 286                 if (strcmp(key, "new_broadcast_address") == 0)
 287                         inet_aton(value, &ipv4.broadcast);
 288
 289                 if (strcmp(key, "new_domain_name_servers") == 0)
 290                         inet_aton(value, &ipv4.nameserver);
 291
 292                 dbus_message_iter_next(&dict);
 293         }
 294
 295         if (strcmp(text, "PREINIT") == 0)
 296                 connman_dhcp_update(task->iface,
 297                                         CONNMAN_DHCP_STATE_INIT, &ipv4);
 298         else if (strcmp(text, "BOUND") == 0 || strcmp(text, "REBOOT") == 0)
 299                 connman_dhcp_update(task->iface,
 300                                         CONNMAN_DHCP_STATE_BOUND, &ipv4);
 301         else if (strcmp(text, "RENEW") == 0 || strcmp(text, "REBIND") == 0)
 302                 connman_dhcp_update(task->iface,
 303                                         CONNMAN_DHCP_STATE_RENEW, &ipv4);
 304         else
 305                 connman_dhcp_update(task->iface,
 306                                         CONNMAN_DHCP_STATE_FAILED, NULL);
 307
 308         return DBUS_HANDLER_RESULT_HANDLED;
 309 }
 310
 311 static DBusConnection *connection;
 312
 313 static int plugin_init(void)
 314 {
 315         gchar *filter;
 316
 317         connection = dbus_bus_get(DBUS_BUS_SYSTEM, NULL);
 318
 319         busname = dbus_bus_get_unique_name(connection);
 320
 321         busname = "org.freedesktop.connman";
 322
 323         dbus_connection_add_filter(connection, dhclient_filter, NULL, NULL);
 324
 325         filter = g_strdup_printf("interface=%s,path=%s",
 326                                                 DHCLIENT_INTF, DHCLIENT_PATH);
 327
 328         dbus_bus_add_match(connection, filter, NULL);
 329
 330         g_free(filter);
 331
 332         connman_dhcp_register(&dhclient_driver);
 333
 334         return 0;
 335 }
 336
 337 static void plugin_exit(void)
 338 {
 339         GSList *list;
 340
 341         for (list = tasks; list; list = list->next) {
 342                 struct dhclient_task *task = list->data;
 343
 344                 printf("[DHCP] killing process %d\n", task->pid);
 345
 346                 kill_task(task);
 347         }
 348
 349         g_slist_free(tasks);
 350
 351         connman_dhcp_unregister(&dhclient_driver);
 352
 353         dbus_connection_unref(connection);
 354 }
 355
 356 CONNMAN_PLUGIN_DEFINE("dhclient", "ISC DHCP client plugin", VERSION,
 357                                                 plugin_init, plugin_exit)