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 <unistd.h>
  28 #include <signal.h>
  29 #include <string.h>
  30 #include <arpa/inet.h>
  31
  32 #include <glib.h>
  33 #include <gdbus.h>
  34
  35 #include <connman/plugin.h>
  36 #include <connman/dhcp.h>
  37
  38 #include "net.h"
  39
  40 static const char *busname;
  41
  42 struct dhclient_task {
  43         GPid pid;
  44         char *ifname;
  45         struct connman_iface *iface;
  46 };
  47
  48 static GSList *tasks = NULL;
  49
  50 static struct dhclient_task *find_task(GPid pid)
  51 {
  52         GSList *list;
  53
  54         for (list = tasks; list; list = list->next) {
  55                 struct dhclient_task *task = list->data;
  56
  57                 if (task->pid == pid)
  58                         return task;
  59         }
  60
  61         return NULL;
  62 }
  63
  64 static int dhclient_request(struct connman_iface *iface)
  65 {
  66         struct dhclient_task *task;
  67         char *ifname, *argv[16], address[128], pidfile[PATH_MAX];
  68         char leases[PATH_MAX], config[PATH_MAX], script[PATH_MAX];
  69
  70         ifname = __net_ifname(iface->sysfs);
  71         if (ifname == NULL)
  72                 return -1;
  73
  74         task = g_try_new0(struct dhclient_task, 1);
  75         if (task == NULL)
  76                 return -1;
  77
  78         task->ifname = ifname;
  79         task->iface = iface;
  80
  81         printf("[DHCP] request for %s\n", ifname);
  82
  83         snprintf(address, sizeof(address) - 1, "BUSNAME=%s", busname);
  84         snprintf(pidfile, sizeof(pidfile) - 1,
  85                                 "%s/dhclient.%s.pid", STATEDIR, ifname);
  86         snprintf(leases, sizeof(leases) - 1,
  87                                 "%s/dhclient.%s.leases", STATEDIR, ifname);
  88         snprintf(config, sizeof(config) - 1, "%s/dhclient.conf", SCRIPTDIR);
  89         snprintf(script, sizeof(script) - 1, "%s/dhclient-script", SCRIPTDIR);
  90
  91         argv[0] = "/sbin/dhclient";
  92         argv[1] = "-d";
  93         argv[2] = "-q";
  94         argv[3] = "-n";
  95         argv[4] = "-e";
  96         argv[5] = address;
  97         argv[6] = "-pf";
  98         argv[7] = pidfile;
  99         argv[8] = "-lf";
 100         argv[9] = leases;
 101         argv[10] = "-cf";
 102         argv[11] = config;
 103         argv[12] = "-sf";
 104         argv[13] = script;
 105         argv[14] = ifname;
 106         argv[15] = NULL;
 107
 108         if (g_spawn_async(NULL, argv, NULL, G_SPAWN_DO_NOT_REAP_CHILD,
 109                                 NULL, NULL, &task->pid, NULL) == FALSE) {
 110                 printf("Failed to spawn dhclient\n");
 111                 return -1;
 112         }
 113
 114         tasks = g_slist_append(tasks, task);
 115
 116         printf("[DHCP] executed with pid %d\n", task->pid);
 117
 118         return 0;
 119 }
 120
 121 static int dhclient_release(struct connman_iface *iface)
 122 {
 123         char *ifname;
 124
 125         ifname = __net_ifname(iface->sysfs);
 126         if (ifname == NULL)
 127                 return -1;
 128
 129         printf("[DHCP] release for %s\n", ifname);
 130
 131         __net_free(ifname);
 132
 133         return 0;
 134 }
 135
 136 static struct connman_dhcp_driver dhclient_driver = {
 137         .name           = "dhclient",
 138         .request        = dhclient_request,
 139         .release        = dhclient_release,
 140 };
 141
 142 static DBusMessage *notify_method(DBusConnection *conn,
 143                                         DBusMessage *msg, void *data)
 144 {
 145         DBusMessageIter iter, dict;
 146         dbus_uint32_t pid;
 147         struct dhclient_task *task;
 148         struct connman_ipv4 ipv4;
 149         const char *text, *key, *value;
 150
 151         memset(&ipv4, 0, sizeof(ipv4));
 152
 153         dbus_message_iter_init(msg, &iter);
 154
 155         dbus_message_iter_get_basic(&iter, &pid);
 156         dbus_message_iter_next(&iter);
 157
 158         dbus_message_iter_get_basic(&iter, &text);
 159         dbus_message_iter_next(&iter);
 160
 161         printf("[DHCP] change %d to %s\n", pid, text);
 162
 163         task = find_task(pid);
 164         if (task == NULL)
 165                 return NULL;
 166
 167         dbus_message_iter_recurse(&iter, &dict);
 168
 169         while (dbus_message_iter_get_arg_type(&dict) == DBUS_TYPE_DICT_ENTRY) {
 170                 DBusMessageIter entry;
 171
 172                 dbus_message_iter_recurse(&dict, &entry);
 173                 dbus_message_iter_get_basic(&entry, &key);
 174                 dbus_message_iter_next(&entry);
 175                 dbus_message_iter_get_basic(&entry, &value);
 176
 177                 printf("[DHCP] %s = %s\n", key, value);
 178
 179                 if (strcmp(key, "new_ip_address") == 0)
 180                         inet_aton(value, &ipv4.address);
 181
 182                 if (strcmp(key, "new_subnet_mask") == 0)
 183                         inet_aton(value, &ipv4.netmask);
 184
 185                 if (strcmp(key, "new_routers") == 0)
 186                         inet_aton(value, &ipv4.gateway);
 187
 188                 if (strcmp(key, "new_network_number") == 0)
 189                         inet_aton(value, &ipv4.network);
 190
 191                 if (strcmp(key, "new_broadcast_address") == 0)
 192                         inet_aton(value, &ipv4.broadcast);
 193
 194                 if (strcmp(key, "new_domain_name_servers") == 0)
 195                         inet_aton(value, &ipv4.nameserver);
 196
 197                 dbus_message_iter_next(&dict);
 198         }
 199
 200         if (strcmp(text, "PREINIT") == 0)
 201                 connman_dhcp_update(task->iface,
 202                                         CONNMAN_DHCP_STATE_INIT, &ipv4);
 203         else if (strcmp(text, "BOUND") == 0 || strcmp(text, "REBOOT") == 0)
 204                 connman_dhcp_update(task->iface,
 205                                         CONNMAN_DHCP_STATE_BOUND, &ipv4);
 206         else if (strcmp(text, "RENEW") == 0 || strcmp(text, "REBIND") == 0)
 207                 connman_dhcp_update(task->iface,
 208                                         CONNMAN_DHCP_STATE_RENEW, &ipv4);
 209         else
 210                 connman_dhcp_update(task->iface,
 211                                         CONNMAN_DHCP_STATE_FAILED, NULL);
 212
 213         return NULL;
 214 }
 215
 216 static GDBusMethodTable dhclient_methods[] = {
 217         { "notify", "usa{ss}", "", notify_method, G_DBUS_METHOD_FLAG_NOREPLY },
 218         { },
 219 };
 220
 221 static DBusConnection *connection;
 222
 223 static int plugin_init(void)
 224 {
 225         connection = g_dbus_setup_bus(DBUS_BUS_SYSTEM, NULL);
 226
 227         busname = dbus_bus_get_unique_name(connection);
 228
 229         g_dbus_register_object(connection, "/org/isc/dhclient", NULL, NULL);
 230
 231         g_dbus_register_interface(connection, "/org/isc/dhclient",
 232                                         "org.isc.dhclient",
 233                                         dhclient_methods, NULL, NULL);
 234
 235         connman_dhcp_register(&dhclient_driver);
 236
 237         return 0;
 238 }
 239
 240 static void plugin_exit(void)
 241 {
 242         GSList *list;
 243
 244         for (list = tasks; list; list = list->next) {
 245                 struct dhclient_task *task = list->data;
 246                 char pathname[PATH_MAX];
 247
 248                 printf("[DHCP] killing process %d\n", task->pid);
 249
 250                 kill(task->pid, SIGTERM);
 251
 252                 snprintf(pathname, sizeof(pathname) - 1,
 253                                 "%s/dhclient.%s.pid", STATEDIR, task->ifname);
 254                 unlink(pathname);
 255
 256                 snprintf(pathname, sizeof(pathname) - 1,
 257                                 "%s/dhclient.%s.leases", STATEDIR, task->ifname);
 258                 unlink(pathname);
 259
 260                 __net_free(task->ifname);
 261
 262                 g_free(task);
 263         }
 264
 265         g_slist_free(tasks);
 266
 267         connman_dhcp_unregister(&dhclient_driver);
 268
 269         g_dbus_cleanup_connection(connection);
 270 }
 271
 272 CONNMAN_PLUGIN_DEFINE("dhclient", "ISC DHCP client plugin", VERSION,
 273                                                 plugin_init, plugin_exit)