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 = data->state;
 110         enum connman_provider_error ret;
 111
 112         DBG("provider %p data %p", provider, data);
 113
 114         if (!data)
 115                 goto vpn_exit;
 116
 117         kill_tun(data->if_name);
 118         connman_provider_set_data(provider, NULL);
 119         connman_rtnl_remove_watch(data->watch);
 120
 121 vpn_exit:
 122         if (state != VPN_STATE_READY && state != VPN_STATE_DISCONNECT) {
 123                 const char *name;
 124                 struct vpn_driver_data *vpn_data;
 125
 126                 name = connman_provider_get_driver_name(provider);
 127                 vpn_data = g_hash_table_lookup(driver_hash, name);
 128                 if (vpn_data != NULL &&
 129                                 vpn_data->vpn_driver->error_code != NULL)
 130                         ret = vpn_data->vpn_driver->error_code(exit_code);
 131                 else
 132                         ret = CONNMAN_PROVIDER_ERROR_UNKNOWN;
 133
 134                 connman_provider_indicate_error(provider, ret);
 135         } else
 136                 connman_provider_set_state(provider,
 137                                                 CONNMAN_PROVIDER_STATE_IDLE);
 138
 139         connman_provider_set_index(provider, -1);
 140         connman_provider_unref(data->provider);
 141         g_free(data);
 142
 143         connman_task_destroy(task);
 144 }
 145
 146 static void vpn_newlink(unsigned flags, unsigned change, void *user_data)
 147 {
 148         struct connman_provider *provider = user_data;
 149         struct vpn_data *data = connman_provider_get_data(provider);
 150
 151         if ((data->flags & IFF_UP) != (flags & IFF_UP)) {
 152                 if (flags & IFF_UP) {
 153                         data->state = VPN_STATE_READY;
 154                         connman_provider_set_state(provider,
 155                                         CONNMAN_PROVIDER_STATE_READY);
 156                 }
 157         }
 158         data->flags = flags;
 159 }
 160
 161 static void vpn_notify(struct connman_task *task,
 162                         DBusMessage *msg, void *user_data)
 163 {
 164         struct connman_provider *provider = user_data;
 165         struct vpn_data *data;
 166         struct vpn_driver_data *vpn_driver_data;
 167         const char *name;
 168         int state, index;
 169
 170         data = connman_provider_get_data(provider);
 171
 172         name = connman_provider_get_driver_name(provider);
 173         vpn_driver_data = g_hash_table_lookup(driver_hash, name);
 174         if (vpn_driver_data == NULL)
 175                 return;
 176
 177         state = vpn_driver_data->vpn_driver->notify(msg, provider);
 178         switch (state) {
 179         case VPN_STATE_CONNECT:
 180         case VPN_STATE_READY:
 181                 index = connman_provider_get_index(provider);
 182                 data->watch = connman_rtnl_add_newlink_watch(index,
 183                                                      vpn_newlink, provider);
 184                 connman_inet_ifup(index);
 185                 break;
 186
 187         case VPN_STATE_UNKNOWN:
 188         case VPN_STATE_IDLE:
 189         case VPN_STATE_DISCONNECT:
 190         case VPN_STATE_FAILURE:
 191                 connman_provider_set_state(provider,
 192                                         CONNMAN_PROVIDER_STATE_DISCONNECT);
 193                 break;
 194         }
 195 }
 196
 197 static int vpn_connect(struct connman_provider *provider)
 198 {
 199         struct vpn_data *data = connman_provider_get_data(provider);
 200         struct vpn_driver_data *vpn_driver_data;
 201         struct ifreq ifr;
 202         const char *name;
 203         int i, fd, index;
 204         int ret = 0;
 205
 206         if (data != NULL)
 207                 return -EISCONN;
 208
 209         data = g_try_new0(struct vpn_data, 1);
 210         if (data == NULL)
 211                 return -ENOMEM;
 212
 213         data->provider = connman_provider_ref(provider);
 214         data->watch = 0;
 215         data->flags = 0;
 216         data->task = NULL;
 217         data->state = VPN_STATE_IDLE;
 218
 219         connman_provider_set_data(provider, data);
 220
 221         name = connman_provider_get_driver_name(provider);
 222         vpn_driver_data = g_hash_table_lookup(driver_hash, name);
 223
 224         fd = open("/dev/net/tun", O_RDWR);
 225         if (fd < 0) {
 226                 i = -errno;
 227                 connman_error("Failed to open /dev/net/tun: %s",
 228                               strerror(errno));
 229                 ret = i;
 230                 goto exist_err;
 231         }
 232
 233         memset(&ifr, 0, sizeof(ifr));
 234         ifr.ifr_flags = IFF_TUN | IFF_NO_PI;
 235
 236         for (i = 0; i < 256; i++) {
 237                 sprintf(ifr.ifr_name, "vpn%d", i);
 238
 239                 if (!ioctl(fd, TUNSETIFF, (void *)&ifr))
 240                         break;
 241         }
 242
 243         if (i == 256) {
 244                 connman_error("Failed to find available tun device");
 245                 close(fd);
 246                 ret = -ENODEV;
 247                 goto exist_err;
 248         }
 249
 250         data->if_name = (char *)g_strdup(ifr.ifr_name);
 251         if (!data->if_name) {
 252                 ret = -ENOMEM;
 253                 goto exist_err;
 254         }
 255
 256         if (ioctl(fd, TUNSETPERSIST, 1)) {
 257                 i = -errno;
 258                 connman_error("Failed to set tun persistent: %s",
 259                               strerror(errno));
 260                 close(fd);
 261                 ret = i;
 262                 goto exist_err;
 263         }
 264
 265         close(fd);
 266
 267         index = connman_inet_ifindex(data->if_name);
 268         if (index < 0) {
 269                 connman_error("Failed to get tun ifindex");
 270                 kill_tun(data->if_name);
 271                 ret = -EIO;
 272                 goto exist_err;
 273         }
 274         connman_provider_set_index(provider, index);
 275
 276         data->task = connman_task_create(vpn_driver_data->program);
 277
 278         if (data->task == NULL) {
 279                 ret = -ENOMEM;
 280                 kill_tun(data->if_name);
 281                 goto exist_err;
 282         }
 283
 284         if (connman_task_set_notify(data->task, "notify",
 285                                         vpn_notify, provider)) {
 286                 ret = -ENOMEM;
 287                 kill_tun(data->if_name);
 288                 connman_task_destroy(data->task);
 289                 data->task = NULL;
 290                 goto exist_err;
 291         }
 292
 293         ret = vpn_driver_data->vpn_driver->connect(provider, data->task,
 294                                                         data->if_name);
 295         if (ret < 0) {
 296                 kill_tun(data->if_name);
 297                 connman_task_destroy(data->task);
 298                 data->task = NULL;
 299                 goto exist_err;
 300         }
 301
 302         DBG("%s started with dev %s",
 303                 vpn_driver_data->provider_driver.name, data->if_name);
 304
 305         data->state = VPN_STATE_CONNECT;
 306
 307         return -EINPROGRESS;
 308
 309 exist_err:
 310         connman_provider_set_index(provider, -1);
 311         connman_provider_set_data(provider, NULL);
 312         connman_provider_unref(data->provider);
 313         g_free(data);
 314
 315         return ret;
 316 }
 317
 318 static int vpn_probe(struct connman_provider *provider)
 319 {
 320         return 0;
 321 }
 322
 323 static int vpn_disconnect(struct connman_provider *provider)
 324 {
 325         struct vpn_data *data = connman_provider_get_data(provider);
 326         struct vpn_driver_data *vpn_driver_data;
 327         const char *name;
 328
 329         DBG("disconnect provider %p:", provider);
 330
 331         if (data == NULL)
 332                 return 0;
 333
 334         name = connman_provider_get_driver_name(provider);
 335         vpn_driver_data = g_hash_table_lookup(driver_hash, name);
 336         if (vpn_driver_data->vpn_driver->disconnect)
 337                 vpn_driver_data->vpn_driver->disconnect();
 338
 339         if (data->watch != 0)
 340                 connman_rtnl_remove_watch(data->watch);
 341
 342         data->watch = 0;
 343         data->state = VPN_STATE_DISCONNECT;
 344         connman_task_stop(data->task);
 345
 346         return 0;
 347 }
 348
 349 static int vpn_remove(struct connman_provider *provider)
 350 {
 351         struct vpn_data *data;
 352
 353         data = connman_provider_get_data(provider);
 354         connman_provider_set_data(provider, NULL);
 355         if (data == NULL)
 356                 return 0;
 357
 358         if (data->watch != 0)
 359                 connman_rtnl_remove_watch(data->watch);
 360         data->watch = 0;
 361         connman_task_stop(data->task);
 362
 363         g_usleep(G_USEC_PER_SEC);
 364         kill_tun(data->if_name);
 365         return 0;
 366 }
 367
 368 int vpn_register(const char *name, struct vpn_driver *vpn_driver,
 369                         const char *program)
 370 {
 371         struct vpn_driver_data *data;
 372
 373         data = g_try_new0(struct vpn_driver_data, 1);
 374         if (data == NULL)
 375                 return -ENOMEM;
 376
 377         data->name = name;
 378         data->program = program;
 379
 380         data->vpn_driver = vpn_driver;
 381
 382         data->provider_driver.name = name;
 383         data->provider_driver.disconnect = vpn_disconnect;
 384         data->provider_driver.connect = vpn_connect;
 385         data->provider_driver.probe = vpn_probe;
 386         data->provider_driver.remove = vpn_remove;
 387
 388         if (driver_hash == NULL) {
 389                 driver_hash = g_hash_table_new_full(g_str_hash,
 390                                                         g_str_equal,
 391                                                         NULL, g_free);
 392         }
 393
 394         g_hash_table_insert(driver_hash, (char *)name, data);
 395
 396         connman_provider_driver_register(&data->provider_driver);
 397
 398         return 0;
 399 }
 400
 401 void vpn_unregister(const char *name)
 402 {
 403         struct vpn_driver_data *data;
 404
 405         data = g_hash_table_lookup(driver_hash, name);
 406         if (data == NULL)
 407                 return;
 408
 409         connman_provider_driver_unregister(&data->provider_driver);
 410
 411         g_hash_table_remove(driver_hash, name);
 412
 413         if (g_hash_table_size(driver_hash) == 0)
 414                 g_hash_table_destroy(driver_hash);
 415 }