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 <errno.h>
  27 #include <unistd.h>
  28 #include <sys/wait.h>
  29 #include <glib/gstdio.h>
  30
  31 #define CONNMAN_API_SUBJECT_TO_CHANGE
  32 #include <connman/plugin.h>
  33 #include <connman/dhcp.h>
  34 #include <connman/dbus.h>
  35 #include <connman/log.h>
  36
  37 #define DHCLIENT_INTF "org.isc.dhclient"
  38 #define DHCLIENT_PATH "/org/isc/dhclient"
  39
  40 static const char *busname;
  41
  42 struct dhclient_task {
  43         GPid pid;
  44         gboolean killed;
  45         int ifindex;
  46         gchar *ifname;
  47         struct dhclient_task *pending;
  48         struct connman_dhcp *dhcp;
  49 };
  50
  51 static GSList *task_list = NULL;
  52
  53 static struct dhclient_task *find_task_by_pid(GPid pid)
  54 {
  55         GSList *list;
  56
  57         for (list = task_list; list; list = list->next) {
  58                 struct dhclient_task *task = list->data;
  59
  60                 if (task->pid == pid)
  61                         return task;
  62         }
  63
  64         return NULL;
  65 }
  66
  67 static struct dhclient_task *find_task_by_index(int index)
  68 {
  69         GSList *list;
  70
  71         for (list = task_list; list; list = list->next) {
  72                 struct dhclient_task *task = list->data;
  73
  74                 if (task->ifindex == index)
  75                         return task;
  76         }
  77
  78         return NULL;
  79 }
  80
  81 static void kill_task(struct dhclient_task *task)
  82 {
  83         DBG("task %p name %s pid %d", task, task->ifname, task->pid);
  84
  85         if (task->killed == TRUE)
  86                 return;
  87
  88         if (task->pid > 0) {
  89                 task->killed = TRUE;
  90                 kill(task->pid, SIGTERM);
  91         }
  92 }
  93
  94 static void unlink_task(struct dhclient_task *task)
  95 {
  96         gchar *pathname;
  97
  98         DBG("task %p name %s pid %d", task, task->ifname, task->pid);
  99
 100         pathname = g_strdup_printf("%s/dhclient.%s.pid",
 101                                                 STATEDIR, task->ifname);
 102         g_unlink(pathname);
 103         g_free(pathname);
 104
 105         pathname = g_strdup_printf("%s/dhclient.%s.leases",
 106                                                 STATEDIR, task->ifname);
 107         g_unlink(pathname);
 108         g_free(pathname);
 109 }
 110
 111 static int start_dhclient(struct dhclient_task *task);
 112
 113 static void task_died(GPid pid, gint status, gpointer data)
 114 {
 115         struct dhclient_task *task = data;
 116
 117         if (WIFEXITED(status))
 118                 DBG("exit status %d for %s", WEXITSTATUS(status), task->ifname);
 119         else
 120                 DBG("signal %d killed %s", WTERMSIG(status), task->ifname);
 121
 122         g_spawn_close_pid(pid);
 123         task->pid = 0;
 124
 125         task_list = g_slist_remove(task_list, task);
 126
 127         unlink_task(task);
 128
 129         if (task->pending != NULL)
 130                 start_dhclient(task->pending);
 131
 132         connman_dhcp_unref(task->dhcp);
 133
 134         g_free(task->ifname);
 135         g_free(task);
 136 }
 137
 138 static void task_setup(gpointer data)
 139 {
 140         struct dhclient_task *task = data;
 141
 142         DBG("task %p name %s", task, task->ifname);
 143
 144         task->killed = FALSE;
 145 }
 146
 147 static int start_dhclient(struct dhclient_task *task)
 148 {
 149         char *argv[16], *envp[1], address[128], pidfile[PATH_MAX];
 150         char leases[PATH_MAX], config[PATH_MAX], script[PATH_MAX];
 151
 152         snprintf(address, sizeof(address) - 1, "BUSNAME=%s", busname);
 153         snprintf(pidfile, sizeof(pidfile) - 1,
 154                         "%s/dhclient.%s.pid", STATEDIR, task->ifname);
 155         snprintf(leases, sizeof(leases) - 1,
 156                         "%s/dhclient.%s.leases", STATEDIR, task->ifname);
 157         snprintf(config, sizeof(config) - 1, "%s/dhclient.conf", SCRIPTDIR);
 158         snprintf(script, sizeof(script) - 1, "%s/dhclient-script", SCRIPTDIR);
 159
 160         argv[0] = DHCLIENT;
 161         argv[1] = "-d";
 162         argv[2] = "-q";
 163         argv[3] = "-e";
 164         argv[4] = address;
 165         argv[5] = "-pf";
 166         argv[6] = pidfile;
 167         argv[7] = "-lf";
 168         argv[8] = leases;
 169         argv[9] = "-cf";
 170         argv[10] = config;
 171         argv[11] = "-sf";
 172         argv[12] = script;
 173         argv[13] = task->ifname;
 174         argv[14] = "-n";
 175         argv[15] = NULL;
 176
 177         envp[0] = NULL;
 178
 179         if (g_spawn_async(NULL, argv, envp, G_SPAWN_DO_NOT_REAP_CHILD,
 180                                 task_setup, task, &task->pid, NULL) == FALSE) {
 181                 connman_error("Failed to spawn dhclient");
 182                 return -1;
 183         }
 184
 185         task_list = g_slist_append(task_list, task);
 186
 187         g_child_watch_add(task->pid, task_died, task);
 188
 189         DBG("executed %s with pid %d", DHCLIENT, task->pid);
 190
 191         return 0;
 192 }
 193
 194 static int dhclient_request(struct connman_dhcp *dhcp)
 195 {
 196         struct dhclient_task *task, *previous;
 197
 198         DBG("dhcp %p", dhcp);
 199
 200         if (access(DHCLIENT, X_OK) < 0)
 201                 return -errno;
 202
 203         task = g_try_new0(struct dhclient_task, 1);
 204         if (task == NULL)
 205                 return -ENOMEM;
 206
 207         task->ifindex = connman_dhcp_get_index(dhcp);
 208         task->ifname  = connman_dhcp_get_interface(dhcp);
 209
 210         if (task->ifname == NULL) {
 211                 g_free(task);
 212                 return -ENOMEM;
 213         }
 214
 215         task->dhcp = connman_dhcp_ref(dhcp);
 216
 217         previous= find_task_by_index(task->ifindex);
 218         if (previous != NULL) {
 219                 previous->pending = task;
 220                 kill_task(previous);
 221                 return 0;
 222         }
 223
 224         return start_dhclient(task);
 225 }
 226
 227 static int dhclient_release(struct connman_dhcp *dhcp)
 228 {
 229         struct dhclient_task *task;
 230         int index;
 231
 232         DBG("dhcp %p", dhcp);
 233
 234         index = connman_dhcp_get_index(dhcp);
 235
 236         task = find_task_by_index(index);
 237         if (task == NULL)
 238                 return -EINVAL;
 239
 240         DBG("release %s", task->ifname);
 241
 242         kill_task(task);
 243
 244         return 0;
 245 }
 246
 247 static struct connman_dhcp_driver dhclient_driver = {
 248         .name           = "dhclient",
 249         .request        = dhclient_request,
 250         .release        = dhclient_release,
 251 };
 252
 253 static DBusHandlerResult dhclient_filter(DBusConnection *conn,
 254                                                 DBusMessage *msg, void *data)
 255 {
 256         DBusMessageIter iter, dict;
 257         dbus_uint32_t pid;
 258         struct dhclient_task *task;
 259         const char *text, *key, *value;
 260
 261         if (dbus_message_is_method_call(msg, DHCLIENT_INTF, "notify") == FALSE)
 262                 return DBUS_HANDLER_RESULT_NOT_YET_HANDLED;
 263
 264         dbus_message_iter_init(msg, &iter);
 265
 266         dbus_message_iter_get_basic(&iter, &pid);
 267         dbus_message_iter_next(&iter);
 268
 269         dbus_message_iter_get_basic(&iter, &text);
 270         dbus_message_iter_next(&iter);
 271
 272         DBG("change %d to %s", pid, text);
 273
 274         task = find_task_by_pid(pid);
 275
 276         if (task == NULL)
 277                 return DBUS_HANDLER_RESULT_NOT_YET_HANDLED;
 278
 279         dbus_message_iter_recurse(&iter, &dict);
 280
 281         while (dbus_message_iter_get_arg_type(&dict) == DBUS_TYPE_DICT_ENTRY) {
 282                 DBusMessageIter entry;
 283
 284                 dbus_message_iter_recurse(&dict, &entry);
 285                 dbus_message_iter_get_basic(&entry, &key);
 286                 dbus_message_iter_next(&entry);
 287                 dbus_message_iter_get_basic(&entry, &value);
 288
 289                 DBG("%s = %s", key, value);
 290
 291                 if (g_strcmp0(key, "new_ip_address") == 0) {
 292                         connman_dhcp_set_value(task->dhcp, "Address", value);
 293                 } else if (g_strcmp0(key, "new_subnet_mask") == 0) {
 294                         connman_dhcp_set_value(task->dhcp, "Netmask", value);
 295                 } else if (g_strcmp0(key, "new_routers") == 0) {
 296                         connman_dhcp_set_value(task->dhcp, "Gateway", value);
 297                 } else if (g_strcmp0(key, "new_network_number") == 0) {
 298                         connman_dhcp_set_value(task->dhcp, "Network", value);
 299                 } else if (g_strcmp0(key, "new_broadcast_address") == 0) {
 300                         connman_dhcp_set_value(task->dhcp, "Broadcast", value);
 301                 } else if (g_strcmp0(key, "new_domain_name_servers") == 0) {
 302                         connman_dhcp_set_value(task->dhcp, "Nameserver", value);
 303                 } else if (g_ascii_strcasecmp(key, "new_domain_name") == 0) {
 304                         connman_dhcp_set_value(task->dhcp, "Domainname", value);
 305                 } else if (g_ascii_strcasecmp(key, "new_domain_search") == 0) {
 306                 } else if (g_ascii_strcasecmp(key, "new_host_name") == 0) {
 307                         connman_dhcp_set_value(task->dhcp, "Hostname", value);
 308                 } else if (g_ascii_strcasecmp(key, "new_ntp_servers") == 0) {
 309                         connman_dhcp_set_value(task->dhcp, "Timeserver", value);
 310                 } else if (g_ascii_strcasecmp(key, "new_interface_mtu") == 0) {
 311                         connman_dhcp_set_value(task->dhcp, "MTU", value);
 312                 }
 313
 314                 dbus_message_iter_next(&dict);
 315         }
 316
 317         if (g_ascii_strcasecmp(text, "PREINIT") == 0) {
 318         } else if (g_ascii_strcasecmp(text, "BOUND") == 0 ||
 319                                 g_ascii_strcasecmp(text, "REBOOT") == 0) {
 320                 connman_dhcp_bound(task->dhcp);
 321         } else if (g_ascii_strcasecmp(text, "RENEW") == 0 ||
 322                                 g_ascii_strcasecmp(text, "REBIND") == 0) {
 323                 connman_dhcp_renew(task->dhcp);
 324         } else if (g_ascii_strcasecmp(text, "FAIL") == 0) {
 325                 connman_dhcp_fail(task->dhcp);
 326         } else {
 327         }
 328
 329         return DBUS_HANDLER_RESULT_HANDLED;
 330 }
 331
 332 static DBusConnection *connection;
 333
 334 static const char *dhclient_rule = "path=" DHCLIENT_PATH
 335                                                 ",interface=" DHCLIENT_INTF;
 336
 337 static int dhclient_init(void)
 338 {
 339         int err;
 340
 341         connection = connman_dbus_get_connection();
 342
 343         busname = dbus_bus_get_unique_name(connection);
 344         busname = CONNMAN_SERVICE;
 345
 346         dbus_connection_add_filter(connection, dhclient_filter, NULL, NULL);
 347
 348         dbus_bus_add_match(connection, dhclient_rule, NULL);
 349
 350         err = connman_dhcp_driver_register(&dhclient_driver);
 351         if (err < 0) {
 352                 dbus_connection_unref(connection);
 353                 return err;
 354         }
 355
 356         return 0;
 357 }
 358
 359 static void dhclient_exit(void)
 360 {
 361         GSList *list;
 362
 363         for (list = task_list; list; list = list->next) {
 364                 struct dhclient_task *task = list->data;
 365
 366                 DBG("killing process %d", task->pid);
 367
 368                 kill_task(task);
 369                 unlink_task(task);
 370         }
 371
 372         g_slist_free(task_list);
 373
 374         connman_dhcp_driver_unregister(&dhclient_driver);
 375
 376         dbus_bus_remove_match(connection, dhclient_rule, NULL);
 377
 378         dbus_connection_remove_filter(connection, dhclient_filter, NULL);
 379
 380         dbus_connection_unref(connection);
 381 }
 382
 383 CONNMAN_PLUGIN_DEFINE(dhclient, "ISC DHCP client plugin", VERSION,
 384                 CONNMAN_PLUGIN_PRIORITY_DEFAULT, dhclient_init, dhclient_exit)