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 <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 #include <connman/dbus.h>
  44
  45 #define DHCLIENT_INTF "org.isc.dhclient"
  46 #define DHCLIENT_PATH "/org/isc/dhclient"
  47
  48 static const char *busname;
  49
  50 struct dhclient_task {
  51         GPid pid;
  52         int ifindex;
  53         char *ifname;
  54         struct connman_iface *iface;
  55 };
  56
  57 static GSList *tasks = NULL;
  58
  59 static struct dhclient_task *find_task_by_pid(GPid pid)
  60 {
  61         GSList *list;
  62
  63         for (list = tasks; list; list = list->next) {
  64                 struct dhclient_task *task = list->data;
  65
  66                 if (task->pid == pid)
  67                         return task;
  68         }
  69
  70         return NULL;
  71 }
  72
  73 static struct dhclient_task *find_task_by_index(int index)
  74 {
  75         GSList *list;
  76
  77         for (list = tasks; list; list = list->next) {
  78                 struct dhclient_task *task = list->data;
  79
  80                 if (task->ifindex == index)
  81                         return task;
  82         }
  83
  84         return NULL;
  85 }
  86
  87 static void kill_task(struct dhclient_task *task)
  88 {
  89         if (task->pid > 0)
  90                 kill(task->pid, SIGTERM);
  91 }
  92
  93 static void task_died(GPid pid, gint status, gpointer data)
  94 {
  95         struct dhclient_task *task = data;
  96         char pathname[PATH_MAX];
  97
  98         if (WIFEXITED(status))
  99                 printf("[DHCP] exit status %d for %s\n",
 100                                         WEXITSTATUS(status), task->ifname);
 101         else
 102                 printf("[DHCP] signal %d killed %s\n",
 103                                         WTERMSIG(status), task->ifname);
 104
 105         g_spawn_close_pid(pid);
 106         task->pid = 0;
 107
 108         tasks = g_slist_remove(tasks, task);
 109
 110         snprintf(pathname, sizeof(pathname) - 1,
 111                         "%s/dhclient.%s.pid", STATEDIR, task->ifname);
 112         unlink(pathname);
 113
 114         snprintf(pathname, sizeof(pathname) - 1,
 115                         "%s/dhclient.%s.leases", STATEDIR, task->ifname);
 116         unlink(pathname);
 117
 118         free(task->ifname);
 119
 120         g_free(task);
 121 }
 122
 123 static void task_setup(gpointer data)
 124 {
 125         struct dhclient_task *task = data;
 126
 127         printf("[DHCP] setup %s\n", task->ifname);
 128 }
 129
 130 static int dhclient_request(struct connman_iface *iface)
 131 {
 132         struct ifreq ifr;
 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         int sk, err;
 137
 138         sk = socket(PF_INET, SOCK_DGRAM, 0);
 139         if (sk < 0)
 140                 return -EIO;
 141
 142         memset(&ifr, 0, sizeof(ifr));
 143         ifr.ifr_ifindex = iface->index;
 144
 145         err = ioctl(sk, SIOCGIFNAME, &ifr);
 146
 147         close(sk);
 148
 149         if (err < 0)
 150                 return -EIO;
 151
 152         task = g_try_new0(struct dhclient_task, 1);
 153         if (task == NULL)
 154                 return -ENOMEM;
 155
 156         task->ifindex = iface->index;
 157         task->ifname = strdup(ifr.ifr_name);
 158         task->iface = iface;
 159
 160         if (task->ifname == NULL) {
 161                 g_free(task);
 162                 return -ENOMEM;
 163         }
 164
 165         printf("[DHCP] request %s\n", task->ifname);
 166
 167         snprintf(address, sizeof(address) - 1, "BUSNAME=%s", busname);
 168         snprintf(pidfile, sizeof(pidfile) - 1,
 169                         "%s/dhclient.%s.pid", STATEDIR, task->ifname);
 170         snprintf(leases, sizeof(leases) - 1,
 171                         "%s/dhclient.%s.leases", STATEDIR, task->ifname);
 172         snprintf(config, sizeof(config) - 1, "%s/dhclient.conf", SCRIPTDIR);
 173         snprintf(script, sizeof(script) - 1, "%s/dhclient-script", SCRIPTDIR);
 174
 175         argv[0] = DHCLIENT;
 176         argv[1] = "-d";
 177         argv[2] = "-q";
 178         argv[3] = "-n";
 179         argv[4] = "-e";
 180         argv[5] = address;
 181         argv[6] = "-pf";
 182         argv[7] = pidfile;
 183         argv[8] = "-lf";
 184         argv[9] = leases;
 185         argv[10] = "-cf";
 186         argv[11] = config;
 187         argv[12] = "-sf";
 188         argv[13] = script;
 189         argv[14] = task->ifname;
 190         argv[15] = NULL;
 191
 192         envp[0] = NULL;
 193
 194         if (g_spawn_async(NULL, argv, envp, G_SPAWN_DO_NOT_REAP_CHILD,
 195                                 task_setup, task, &task->pid, NULL) == FALSE) {
 196                 printf("Failed to spawn dhclient\n");
 197                 return -1;
 198         }
 199
 200         tasks = g_slist_append(tasks, task);
 201
 202         g_child_watch_add(task->pid, task_died, task);
 203
 204         printf("[DHCP] executed %s with pid %d\n", DHCLIENT, task->pid);
 205
 206         return 0;
 207 }
 208
 209 static int dhclient_release(struct connman_iface *iface)
 210 {
 211         struct dhclient_task *task;
 212
 213         task = find_task_by_index(iface->index);
 214         if (task == NULL)
 215                 return -ENODEV;
 216
 217         printf("[DHCP] release %s\n", task->ifname);
 218
 219         tasks = g_slist_remove(tasks, task);
 220
 221         kill_task(task);
 222
 223         return 0;
 224 }
 225
 226 static struct connman_dhcp_driver dhclient_driver = {
 227         .name           = "dhclient",
 228         .request        = dhclient_request,
 229         .release        = dhclient_release,
 230 };
 231
 232 static DBusHandlerResult dhclient_filter(DBusConnection *conn,
 233                                                 DBusMessage *msg, void *data)
 234 {
 235         DBusMessageIter iter, dict;
 236         dbus_uint32_t pid;
 237         struct dhclient_task *task;
 238         struct connman_ipv4 ipv4;
 239         const char *text, *key, *value;
 240
 241         if (dbus_message_is_method_call(msg, DHCLIENT_INTF, "notify") == FALSE)
 242                 return DBUS_HANDLER_RESULT_NOT_YET_HANDLED;
 243
 244         memset(&ipv4, 0, sizeof(ipv4));
 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         printf("[DHCP] change %d to %s\n", pid, text);
 255
 256         task = find_task_by_pid(pid);
 257         if (task == NULL)
 258                 return DBUS_HANDLER_RESULT_NOT_YET_HANDLED;
 259
 260         dbus_message_iter_recurse(&iter, &dict);
 261
 262         while (dbus_message_iter_get_arg_type(&dict) == DBUS_TYPE_DICT_ENTRY) {
 263                 DBusMessageIter entry;
 264
 265                 dbus_message_iter_recurse(&dict, &entry);
 266                 dbus_message_iter_get_basic(&entry, &key);
 267                 dbus_message_iter_next(&entry);
 268                 dbus_message_iter_get_basic(&entry, &value);
 269
 270                 printf("[DHCP] %s = %s\n", key, value);
 271
 272                 if (strcmp(key, "new_ip_address") == 0)
 273                         inet_aton(value, &ipv4.address);
 274
 275                 if (strcmp(key, "new_subnet_mask") == 0)
 276                         inet_aton(value, &ipv4.netmask);
 277
 278                 if (strcmp(key, "new_routers") == 0)
 279                         inet_aton(value, &ipv4.gateway);
 280
 281                 if (strcmp(key, "new_network_number") == 0)
 282                         inet_aton(value, &ipv4.network);
 283
 284                 if (strcmp(key, "new_broadcast_address") == 0)
 285                         inet_aton(value, &ipv4.broadcast);
 286
 287                 if (strcmp(key, "new_domain_name_servers") == 0)
 288                         inet_aton(value, &ipv4.nameserver);
 289
 290                 dbus_message_iter_next(&dict);
 291         }
 292
 293         if (strcmp(text, "PREINIT") == 0)
 294                 connman_dhcp_update(task->iface,
 295                                         CONNMAN_DHCP_STATE_INIT, &ipv4);
 296         else if (strcmp(text, "BOUND") == 0 || strcmp(text, "REBOOT") == 0)
 297                 connman_dhcp_update(task->iface,
 298                                         CONNMAN_DHCP_STATE_BOUND, &ipv4);
 299         else if (strcmp(text, "RENEW") == 0 || strcmp(text, "REBIND") == 0)
 300                 connman_dhcp_update(task->iface,
 301                                         CONNMAN_DHCP_STATE_RENEW, &ipv4);
 302         else
 303                 connman_dhcp_update(task->iface,
 304                                         CONNMAN_DHCP_STATE_FAILED, NULL);
 305
 306         return DBUS_HANDLER_RESULT_HANDLED;
 307 }
 308
 309 static DBusConnection *connection;
 310
 311 static int plugin_init(void)
 312 {
 313         gchar *filter;
 314
 315         connection = dbus_bus_get(DBUS_BUS_SYSTEM, NULL);
 316
 317         busname = dbus_bus_get_unique_name(connection);
 318         busname = CONNMAN_SERVICE;
 319
 320         dbus_connection_add_filter(connection, dhclient_filter, NULL, NULL);
 321
 322         filter = g_strdup_printf("interface=%s,path=%s",
 323                                                 DHCLIENT_INTF, DHCLIENT_PATH);
 324
 325         dbus_bus_add_match(connection, filter, NULL);
 326
 327         g_free(filter);
 328
 329         connman_dhcp_register(&dhclient_driver);
 330
 331         return 0;
 332 }
 333
 334 static void plugin_exit(void)
 335 {
 336         GSList *list;
 337
 338         for (list = tasks; list; list = list->next) {
 339                 struct dhclient_task *task = list->data;
 340
 341                 printf("[DHCP] killing process %d\n", task->pid);
 342
 343                 kill_task(task);
 344         }
 345
 346         g_slist_free(tasks);
 347
 348         connman_dhcp_unregister(&dhclient_driver);
 349
 350         dbus_connection_unref(connection);
 351 }
 352
 353 CONNMAN_PLUGIN_DEFINE("dhclient", "ISC DHCP client plugin", VERSION,
 354                                                 plugin_init, plugin_exit)