plugins/vpn.c

   1 /*
   2  *
   3  *  Connection Manager
   4  *
   5  *  Copyright (C) 2007-2010  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 <string.h>
  27 #include <fcntl.h>
  28 #include <unistd.h>
  29 #include <sys/stat.h>
  30 #include <stdio.h>
  31 #include <errno.h>
  32 #include <sys/ioctl.h>
  33 #include <sys/types.h>
  34 #include <linux/if_tun.h>
  35 #include <net/if.h>
  36
  37 #include <dbus/dbus.h>
  38
  39 #include <glib/ghash.h>
  40 #include <glib/gprintf.h>
  41
  42 #include <connman/provider.h>
  43 #include <connman/log.h>
  44 #include <connman/rtnl.h>
  45 #include <connman/task.h>
  46 #include <connman/inet.h>
  47
  48 #include "vpn.h"
  49
  50 struct vpn_data {
  51         struct connman_provider *provider;
  52         char *if_name;
  53         unsigned flags;
  54         unsigned int watch;
  55         unsigned int state;
  56         struct connman_task *task;
  57 };
  58
  59 struct vpn_driver_data {
  60         const char *name;
  61         const char *program;
  62         struct vpn_driver *vpn_driver;
  63         struct connman_provider_driver provider_driver;
  64 };
  65
  66 GHashTable *driver_hash = NULL;
  67
  68 static int kill_tun(char *tun_name)
  69 {
  70         struct ifreq ifr;
  71         int fd, err;
  72
  73         memset(&ifr, 0, sizeof(ifr));
  74         ifr.ifr_flags = IFF_TUN | IFF_NO_PI;
  75         sprintf(ifr.ifr_name, "%s", tun_name);
  76
  77         fd = open("/dev/net/tun", O_RDWR);
  78         if (fd < 0) {
  79                 err = -errno;
  80                 connman_error("Failed to open /dev/net/tun to device %s: %s",
  81                               tun_name, strerror(errno));
  82                 return err;
  83         }
  84
  85         if (ioctl(fd, TUNSETIFF, (void *)&ifr)) {
  86                 err = -errno;
  87                 connman_error("Failed to TUNSETIFF for device %s to it: %s",
  88                               tun_name, strerror(errno));
  89                 close(fd);
  90                 return err;
  91         }
  92
  93         if (ioctl(fd, TUNSETPERSIST, 0)) {
  94                 err = -errno;
  95                 connman_error("Failed to set tun device %s nonpersistent: %s",
  96                               tun_name, strerror(errno));
  97                 close(fd);
  98                 return err;
  99         }
 100         close(fd);
 101         DBG("Killed tun device %s", tun_name);
 102         return 0;
 103 }
 104
 105 void vpn_died(struct connman_task *task, int exit_code, void *user_data)
 106 {
 107         struct connman_provider *provider = user_data;
 108         struct vpn_data *data = connman_provider_get_data(provider);
 109         int state = VPN_STATE_FAILURE;
 110         enum connman_provider_error ret;
 111
 112         DBG("provider %p data %p", provider, data);
 113
 114         if (data == NULL)
 115                 goto vpn_exit;
 116
 117         state = data->state;
 118
 119         kill_tun(data->if_name);
 120         connman_provider_set_data(provider, NULL);
 121         connman_rtnl_remove_watch(data->watch);
 122
 123 vpn_exit:
 124         if (state != VPN_STATE_READY && state != VPN_STATE_DISCONNECT) {
 125                 const char *name;
 126                 struct vpn_driver_data *vpn_data;
 127
 128                 name = connman_provider_get_driver_name(provider);
 129                 vpn_data = g_hash_table_lookup(driver_hash, name);
 130                 if (vpn_data != NULL &&
 131                                 vpn_data->vpn_driver->error_code != NULL)
 132                         ret = vpn_data->vpn_driver->error_code(exit_code);
 133                 else
 134                         ret = CONNMAN_PROVIDER_ERROR_UNKNOWN;
 135
 136                 connman_provider_indicate_error(provider, ret);
 137         } else
 138                 connman_provider_set_state(provider,
 139                                                 CONNMAN_PROVIDER_STATE_IDLE);
 140
 141         connman_provider_set_index(provider, -1);
 142         connman_provider_unref(data->provider);
 143         g_free(data);
 144
 145         connman_task_destroy(task);
 146 }
 147
 148 static void vpn_newlink(unsigned flags, unsigned change, void *user_data)
 149 {
 150         struct connman_provider *provider = user_data;
 151         struct vpn_data *data = connman_provider_get_data(provider);
 152
 153         if ((data->flags & IFF_UP) != (flags & IFF_UP)) {
 154                 if (flags & IFF_UP) {
 155                         data->state = VPN_STATE_READY;
 156                         connman_provider_set_state(provider,
 157                                         CONNMAN_PROVIDER_STATE_READY);
 158                 }
 159         }
 160         data->flags = flags;
 161 }
 162
 163 static void vpn_notify(struct connman_task *task,
 164                         DBusMessage *msg, void *user_data)
 165 {
 166         struct connman_provider *provider = user_data;
 167         struct vpn_data *data;
 168         struct vpn_driver_data *vpn_driver_data;
 169         const char *name;
 170         int state, index;
 171
 172         data = connman_provider_get_data(provider);
 173
 174         name = connman_provider_get_driver_name(provider);
 175         vpn_driver_data = g_hash_table_lookup(driver_hash, name);
 176         if (vpn_driver_data == NULL)
 177                 return;
 178
 179         state = vpn_driver_data->vpn_driver->notify(msg, provider);
 180         switch (state) {
 181         case VPN_STATE_CONNECT:
 182         case VPN_STATE_READY:
 183                 index = connman_provider_get_index(provider);
 184                 data->watch = connman_rtnl_add_newlink_watch(index,
 185                                                      vpn_newlink, provider);
 186                 connman_inet_ifup(index);
 187                 break;
 188
 189         case VPN_STATE_UNKNOWN:
 190         case VPN_STATE_IDLE:
 191         case VPN_STATE_DISCONNECT:
 192         case VPN_STATE_FAILURE:
 193                 connman_provider_set_state(provider,
 194                                         CONNMAN_PROVIDER_STATE_DISCONNECT);
 195                 break;
 196         }
 197 }
 198
 199 static int vpn_connect(struct connman_provider *provider)
 200 {
 201         struct vpn_data *data = connman_provider_get_data(provider);
 202         struct vpn_driver_data *vpn_driver_data;
 203         struct ifreq ifr;
 204         const char *name;
 205         int i, fd, index;
 206         int ret = 0;
 207
 208         if (data != NULL)
 209                 return -EISCONN;
 210
 211         data = g_try_new0(struct vpn_data, 1);
 212         if (data == NULL)
 213                 return -ENOMEM;
 214
 215         data->provider = connman_provider_ref(provider);
 216         data->watch = 0;
 217         data->flags = 0;
 218         data->task = NULL;
 219         data->state = VPN_STATE_IDLE;
 220
 221         connman_provider_set_data(provider, data);
 222
 223         name = connman_provider_get_driver_name(provider);
 224         vpn_driver_data = g_hash_table_lookup(driver_hash, name);
 225
 226         fd = open("/dev/net/tun", O_RDWR);
 227         if (fd < 0) {
 228                 i = -errno;
 229                 connman_error("Failed to open /dev/net/tun: %s",
 230                               strerror(errno));
 231                 ret = i;
 232                 goto exist_err;
 233         }
 234
 235         memset(&ifr, 0, sizeof(ifr));
 236         ifr.ifr_flags = IFF_TUN | IFF_NO_PI;
 237
 238         for (i = 0; i < 256; i++) {
 239                 sprintf(ifr.ifr_name, "vpn%d", i);
 240
 241                 if (!ioctl(fd, TUNSETIFF, (void *)&ifr))
 242                         break;
 243         }
 244
 245         if (i == 256) {
 246                 connman_error("Failed to find available tun device");
 247                 close(fd);
 248                 ret = -ENODEV;
 249                 goto exist_err;
 250         }
 251
 252         data->if_name = (char *)g_strdup(ifr.ifr_name);
 253         if (!data->if_name) {
 254                 ret = -ENOMEM;
 255                 goto exist_err;
 256         }
 257
 258         if (ioctl(fd, TUNSETPERSIST, 1)) {
 259                 i = -errno;
 260                 connman_error("Failed to set tun persistent: %s",
 261                               strerror(errno));
 262                 close(fd);
 263                 ret = i;
 264                 goto exist_err;
 265         }
 266
 267         close(fd);
 268
 269         index = connman_inet_ifindex(data->if_name);
 270         if (index < 0) {
 271                 connman_error("Failed to get tun ifindex");
 272                 kill_tun(data->if_name);
 273                 ret = -EIO;
 274                 goto exist_err;
 275         }
 276         connman_provider_set_index(provider, index);
 277
 278         data->task = connman_task_create(vpn_driver_data->program);
 279
 280         if (data->task == NULL) {
 281                 ret = -ENOMEM;
 282                 kill_tun(data->if_name);
 283                 goto exist_err;
 284         }
 285
 286         if (connman_task_set_notify(data->task, "notify",
 287                                         vpn_notify, provider)) {
 288                 ret = -ENOMEM;
 289                 kill_tun(data->if_name);
 290                 connman_task_destroy(data->task);
 291                 data->task = NULL;
 292                 goto exist_err;
 293         }
 294
 295         ret = vpn_driver_data->vpn_driver->connect(provider, data->task,
 296                                                         data->if_name);
 297         if (ret < 0) {
 298                 kill_tun(data->if_name);
 299                 connman_task_destroy(data->task);
 300                 data->task = NULL;
 301                 goto exist_err;
 302         }
 303
 304         DBG("%s started with dev %s",
 305                 vpn_driver_data->provider_driver.name, data->if_name);
 306
 307         data->state = VPN_STATE_CONNECT;
 308
 309         return -EINPROGRESS;
 310
 311 exist_err:
 312         connman_provider_set_index(provider, -1);
 313         connman_provider_set_data(provider, NULL);
 314         connman_provider_unref(data->provider);
 315         g_free(data);
 316
 317         return ret;
 318 }
 319
 320 static int vpn_probe(struct connman_provider *provider)
 321 {
 322         return 0;
 323 }
 324
 325 static int vpn_disconnect(struct connman_provider *provider)
 326 {
 327         struct vpn_data *data = connman_provider_get_data(provider);
 328         struct vpn_driver_data *vpn_driver_data;
 329         const char *name;
 330
 331         DBG("disconnect provider %p:", provider);
 332
 333         if (data == NULL)
 334                 return 0;
 335
 336         name = connman_provider_get_driver_name(provider);
 337         vpn_driver_data = g_hash_table_lookup(driver_hash, name);
 338         if (vpn_driver_data->vpn_driver->disconnect)
 339                 vpn_driver_data->vpn_driver->disconnect();
 340
 341         if (data->watch != 0)
 342                 connman_rtnl_remove_watch(data->watch);
 343
 344         data->watch = 0;
 345         data->state = VPN_STATE_DISCONNECT;
 346         connman_task_stop(data->task);
 347
 348         return 0;
 349 }
 350
 351 static int vpn_remove(struct connman_provider *provider)
 352 {
 353         struct vpn_data *data;
 354
 355         data = connman_provider_get_data(provider);
 356         connman_provider_set_data(provider, NULL);
 357         if (data == NULL)
 358                 return 0;
 359
 360         if (data->watch != 0)
 361                 connman_rtnl_remove_watch(data->watch);
 362         data->watch = 0;
 363         connman_task_stop(data->task);
 364
 365         g_usleep(G_USEC_PER_SEC);
 366         kill_tun(data->if_name);
 367         return 0;
 368 }
 369
 370 int vpn_register(const char *name, struct vpn_driver *vpn_driver,
 371                         const char *program)
 372 {
 373         struct vpn_driver_data *data;
 374
 375         data = g_try_new0(struct vpn_driver_data, 1);
 376         if (data == NULL)
 377                 return -ENOMEM;
 378
 379         data->name = name;
 380         data->program = program;
 381
 382         data->vpn_driver = vpn_driver;
 383
 384         data->provider_driver.name = name;
 385         data->provider_driver.disconnect = vpn_disconnect;
 386         data->provider_driver.connect = vpn_connect;
 387         data->provider_driver.probe = vpn_probe;
 388         data->provider_driver.remove = vpn_remove;
 389
 390         if (driver_hash == NULL) {
 391                 driver_hash = g_hash_table_new_full(g_str_hash,
 392                                                         g_str_equal,
 393                                                         NULL, g_free);
 394         }
 395
 396         g_hash_table_insert(driver_hash, (char *)name, data);
 397
 398         connman_provider_driver_register(&data->provider_driver);
 399
 400         return 0;
 401 }
 402
 403 void vpn_unregister(const char *name)
 404 {
 405         struct vpn_driver_data *data;
 406
 407         data = g_hash_table_lookup(driver_hash, name);
 408         if (data == NULL)
 409                 return;
 410
 411         connman_provider_driver_unregister(&data->provider_driver);
 412
 413         g_hash_table_remove(driver_hash, name);
 414
 415         if (g_hash_table_size(driver_hash) == 0)
 416                 g_hash_table_destroy(driver_hash);
 417 }