vpn/plugins/vpn.c

   1 /*
   2  *
   3  *  ConnMan VPN daemon
   4  *
   5  *  Copyright (C) 2007-2012  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 #define _GNU_SOURCE
  27 #include <string.h>
  28 #include <fcntl.h>
  29 #include <unistd.h>
  30 #include <sys/stat.h>
  31 #include <stdio.h>
  32 #include <errno.h>
  33 #include <sys/ioctl.h>
  34 #include <sys/types.h>
  35 #include <linux/if_tun.h>
  36 #include <net/if.h>
  37
  38 #include <dbus/dbus.h>
  39
  40 #include <glib/gprintf.h>
  41
  42 #include <connman/log.h>
  43 #include <connman/rtnl.h>
  44 #include <connman/task.h>
  45 #include <connman/inet.h>
  46
  47 #include "../vpn-rtnl.h"
  48 #include "../vpn-provider.h"
  49
  50 #include "vpn.h"
  51
  52 struct vpn_data {
  53         struct vpn_provider *provider;
  54         char *if_name;
  55         unsigned flags;
  56         unsigned int watch;
  57         unsigned int state;
  58         struct connman_task *task;
  59 };
  60
  61 struct vpn_driver_data {
  62         const char *name;
  63         const char *program;
  64         struct vpn_driver *vpn_driver;
  65         struct vpn_provider_driver provider_driver;
  66 };
  67
  68 GHashTable *driver_hash = NULL;
  69
  70 static int stop_vpn(struct vpn_provider *provider)
  71 {
  72         struct vpn_data *data = vpn_provider_get_data(provider);
  73         struct vpn_driver_data *vpn_driver_data;
  74         const char *name;
  75         struct ifreq ifr;
  76         int fd, err;
  77
  78         if (data == NULL)
  79                 return -EINVAL;
  80
  81         name = vpn_provider_get_driver_name(provider);
  82         if (name == NULL)
  83                 return -EINVAL;
  84
  85         vpn_driver_data = g_hash_table_lookup(driver_hash, name);
  86
  87         if (vpn_driver_data != NULL && vpn_driver_data->vpn_driver != NULL &&
  88                         vpn_driver_data->vpn_driver->flags == VPN_FLAG_NO_TUN)
  89                 return 0;
  90
  91         memset(&ifr, 0, sizeof(ifr));
  92         ifr.ifr_flags = IFF_TUN | IFF_NO_PI;
  93         sprintf(ifr.ifr_name, "%s", data->if_name);
  94
  95         fd = open("/dev/net/tun", O_RDWR | O_CLOEXEC);
  96         if (fd < 0) {
  97                 err = -errno;
  98                 connman_error("Failed to open /dev/net/tun to device %s: %s",
  99                               data->if_name, strerror(errno));
 100                 return err;
 101         }
 102
 103         if (ioctl(fd, TUNSETIFF, (void *)&ifr)) {
 104                 err = -errno;
 105                 connman_error("Failed to TUNSETIFF for device %s to it: %s",
 106                               data->if_name, strerror(errno));
 107                 close(fd);
 108                 return err;
 109         }
 110
 111         if (ioctl(fd, TUNSETPERSIST, 0)) {
 112                 err = -errno;
 113                 connman_error("Failed to set tun device %s nonpersistent: %s",
 114                               data->if_name, strerror(errno));
 115                 close(fd);
 116                 return err;
 117         }
 118         close(fd);
 119         DBG("Killed tun device %s", data->if_name);
 120         return 0;
 121 }
 122
 123 void vpn_died(struct connman_task *task, int exit_code, void *user_data)
 124 {
 125         struct vpn_provider *provider = user_data;
 126         struct vpn_data *data = vpn_provider_get_data(provider);
 127         int state = VPN_STATE_FAILURE;
 128         enum vpn_provider_error ret;
 129
 130         DBG("provider %p data %p", provider, data);
 131
 132         if (data == NULL)
 133                 goto vpn_exit;
 134
 135         state = data->state;
 136
 137         stop_vpn(provider);
 138         vpn_provider_set_data(provider, NULL);
 139
 140         if (data->watch != 0) {
 141                 vpn_provider_unref(provider);
 142                 vpn_rtnl_remove_watch(data->watch);
 143                 data->watch = 0;
 144         }
 145
 146 vpn_exit:
 147         if (state != VPN_STATE_READY && state != VPN_STATE_DISCONNECT) {
 148                 const char *name;
 149                 struct vpn_driver_data *vpn_data = NULL;
 150
 151                 name = vpn_provider_get_driver_name(provider);
 152                 if (name != NULL)
 153                         vpn_data = g_hash_table_lookup(driver_hash, name);
 154
 155                 if (vpn_data != NULL &&
 156                                 vpn_data->vpn_driver->error_code != NULL)
 157                         ret = vpn_data->vpn_driver->error_code(exit_code);
 158                 else
 159                         ret = VPN_PROVIDER_ERROR_UNKNOWN;
 160
 161                 vpn_provider_indicate_error(provider, ret);
 162
 163                 vpn_provider_set_state(provider, VPN_PROVIDER_STATE_FAILURE);
 164         } else
 165                 vpn_provider_set_state(provider, VPN_PROVIDER_STATE_IDLE);
 166
 167         vpn_provider_set_index(provider, -1);
 168
 169         if (data != NULL) {
 170                 vpn_provider_unref(data->provider);
 171                 g_free(data->if_name);
 172                 g_free(data);
 173         }
 174
 175         connman_task_destroy(task);
 176 }
 177
 178 int vpn_set_ifname(struct vpn_provider *provider, const char *ifname)
 179 {
 180         struct vpn_data *data = vpn_provider_get_data(provider);
 181         int index;
 182
 183         if (ifname == NULL || data == NULL)
 184                 return  -EIO;
 185
 186         index = connman_inet_ifindex(ifname);
 187         if (index < 0)
 188                 return  -EIO;
 189
 190         if (data->if_name != NULL)
 191                 g_free(data->if_name);
 192
 193         data->if_name = (char *)g_strdup(ifname);
 194         vpn_provider_set_index(provider, index);
 195
 196         return 0;
 197 }
 198
 199 static void vpn_newlink(unsigned flags, unsigned change, void *user_data)
 200 {
 201         struct vpn_provider *provider = user_data;
 202         struct vpn_data *data = vpn_provider_get_data(provider);
 203
 204         if ((data->flags & IFF_UP) != (flags & IFF_UP)) {
 205                 if (flags & IFF_UP) {
 206                         data->state = VPN_STATE_READY;
 207                         vpn_provider_set_state(provider,
 208                                         VPN_PROVIDER_STATE_READY);
 209                 }
 210         }
 211         data->flags = flags;
 212 }
 213
 214 static DBusMessage *vpn_notify(struct connman_task *task,
 215                         DBusMessage *msg, void *user_data)
 216 {
 217         struct vpn_provider *provider = user_data;
 218         struct vpn_data *data;
 219         struct vpn_driver_data *vpn_driver_data;
 220         const char *name;
 221         int state, index, err;
 222
 223         data = vpn_provider_get_data(provider);
 224
 225         name = vpn_provider_get_driver_name(provider);
 226
 227         if (name == NULL) {
 228                 DBG("Cannot find VPN driver for provider %p", provider);
 229                 vpn_provider_set_state(provider, VPN_PROVIDER_STATE_FAILURE);
 230                 return NULL;
 231         }
 232
 233         vpn_driver_data = g_hash_table_lookup(driver_hash, name);
 234         if (vpn_driver_data == NULL) {
 235                 DBG("Cannot find VPN driver data for name %s", name);
 236                 vpn_provider_set_state(provider, VPN_PROVIDER_STATE_FAILURE);
 237                 return NULL;
 238         }
 239
 240         state = vpn_driver_data->vpn_driver->notify(msg, provider);
 241
 242         DBG("provider %p driver %s state %d", provider, name, state);
 243
 244         switch (state) {
 245         case VPN_STATE_CONNECT:
 246         case VPN_STATE_READY:
 247                 index = vpn_provider_get_index(provider);
 248                 vpn_provider_ref(provider);
 249                 data->watch = vpn_rtnl_add_newlink_watch(index,
 250                                                      vpn_newlink, provider);
 251                 err = connman_inet_ifup(index);
 252                 if (err < 0) {
 253                         if (err == -EALREADY)
 254                                 /*
 255                                  * So the interface is up already, that is just
 256                                  * great. Unfortunately in this case the
 257                                  * newlink watch might not have been called at
 258                                  * all. We must manually call it here so that
 259                                  * the provider can go to ready state and the
 260                                  * routes are setup properly.
 261                                  */
 262                                 vpn_newlink(IFF_UP, 0, provider);
 263                         else
 264                                 DBG("Cannot take interface %d up err %d/%s",
 265                                         index, -err, strerror(-err));
 266                 }
 267                 break;
 268
 269         case VPN_STATE_UNKNOWN:
 270         case VPN_STATE_IDLE:
 271         case VPN_STATE_DISCONNECT:
 272         case VPN_STATE_FAILURE:
 273                 vpn_provider_set_state(provider,
 274                                         VPN_PROVIDER_STATE_DISCONNECT);
 275                 break;
 276
 277         case VPN_STATE_AUTH_FAILURE:
 278                 vpn_provider_indicate_error(provider,
 279                                         VPN_PROVIDER_ERROR_AUTH_FAILED);
 280                 break;
 281         }
 282
 283         return NULL;
 284 }
 285
 286 static int vpn_create_tun(struct vpn_provider *provider)
 287 {
 288         struct vpn_data *data = vpn_provider_get_data(provider);
 289         struct ifreq ifr;
 290         int i, fd, index;
 291         int ret = 0;
 292
 293         if (data == NULL)
 294                 return -EISCONN;
 295
 296         fd = open("/dev/net/tun", O_RDWR | O_CLOEXEC);
 297         if (fd < 0) {
 298                 i = -errno;
 299                 connman_error("Failed to open /dev/net/tun: %s",
 300                               strerror(errno));
 301                 ret = i;
 302                 goto exist_err;
 303         }
 304
 305         memset(&ifr, 0, sizeof(ifr));
 306         ifr.ifr_flags = IFF_TUN | IFF_NO_PI;
 307
 308         for (i = 0; i < 256; i++) {
 309                 sprintf(ifr.ifr_name, "vpn%d", i);
 310
 311                 if (!ioctl(fd, TUNSETIFF, (void *)&ifr))
 312                         break;
 313         }
 314
 315         if (i == 256) {
 316                 connman_error("Failed to find available tun device");
 317                 close(fd);
 318                 ret = -ENODEV;
 319                 goto exist_err;
 320         }
 321
 322         data->if_name = (char *)g_strdup(ifr.ifr_name);
 323         if (data->if_name == NULL) {
 324                 connman_error("Failed to allocate memory");
 325                 close(fd);
 326                 ret = -ENOMEM;
 327                 goto exist_err;
 328         }
 329
 330         if (ioctl(fd, TUNSETPERSIST, 1)) {
 331                 i = -errno;
 332                 connman_error("Failed to set tun persistent: %s",
 333                               strerror(errno));
 334                 close(fd);
 335                 ret = i;
 336                 goto exist_err;
 337         }
 338
 339         close(fd);
 340
 341         index = connman_inet_ifindex(data->if_name);
 342         if (index < 0) {
 343                 connman_error("Failed to get tun ifindex");
 344                 stop_vpn(provider);
 345                 ret = -EIO;
 346                 goto exist_err;
 347         }
 348         vpn_provider_set_index(provider, index);
 349
 350         return 0;
 351
 352 exist_err:
 353         return ret;
 354 }
 355
 356 static int vpn_connect(struct vpn_provider *provider,
 357                         vpn_provider_connect_cb_t cb, void *user_data)
 358 {
 359         struct vpn_data *data = vpn_provider_get_data(provider);
 360         struct vpn_driver_data *vpn_driver_data;
 361         const char *name;
 362         int ret = 0;
 363
 364         if (data != NULL)
 365                 return -EISCONN;
 366
 367         data = g_try_new0(struct vpn_data, 1);
 368         if (data == NULL)
 369                 return -ENOMEM;
 370
 371         data->provider = vpn_provider_ref(provider);
 372         data->watch = 0;
 373         data->flags = 0;
 374         data->task = NULL;
 375         data->state = VPN_STATE_IDLE;
 376
 377         vpn_provider_set_data(provider, data);
 378
 379         name = vpn_provider_get_driver_name(provider);
 380         if (name == NULL)
 381                 return -EINVAL;
 382
 383         vpn_driver_data = g_hash_table_lookup(driver_hash, name);
 384
 385         if (vpn_driver_data == NULL || vpn_driver_data->vpn_driver == NULL) {
 386                 ret = -EINVAL;
 387                 goto exist_err;
 388         }
 389
 390         if (vpn_driver_data->vpn_driver->flags != VPN_FLAG_NO_TUN) {
 391                 ret = vpn_create_tun(provider);
 392                 if (ret < 0)
 393                         goto exist_err;
 394         }
 395
 396         data->task = connman_task_create(vpn_driver_data->program);
 397
 398         if (data->task == NULL) {
 399                 ret = -ENOMEM;
 400                 stop_vpn(provider);
 401                 goto exist_err;
 402         }
 403
 404         if (connman_task_set_notify(data->task, "notify",
 405                                         vpn_notify, provider)) {
 406                 ret = -ENOMEM;
 407                 stop_vpn(provider);
 408                 connman_task_destroy(data->task);
 409                 data->task = NULL;
 410                 goto exist_err;
 411         }
 412
 413         ret = vpn_driver_data->vpn_driver->connect(provider, data->task,
 414                                                 data->if_name, cb, user_data);
 415         if (ret < 0 && ret != -EINPROGRESS) {
 416                 stop_vpn(provider);
 417                 connman_task_destroy(data->task);
 418                 data->task = NULL;
 419                 goto exist_err;
 420         }
 421
 422         DBG("%s started with dev %s",
 423                 vpn_driver_data->provider_driver.name, data->if_name);
 424
 425         data->state = VPN_STATE_CONNECT;
 426
 427         return -EINPROGRESS;
 428
 429 exist_err:
 430         vpn_provider_set_index(provider, -1);
 431         vpn_provider_set_data(provider, NULL);
 432         vpn_provider_unref(data->provider);
 433         g_free(data->if_name);
 434         g_free(data);
 435
 436         return ret;
 437 }
 438
 439 static int vpn_probe(struct vpn_provider *provider)
 440 {
 441         return 0;
 442 }
 443
 444 static int vpn_disconnect(struct vpn_provider *provider)
 445 {
 446         struct vpn_data *data = vpn_provider_get_data(provider);
 447         struct vpn_driver_data *vpn_driver_data;
 448         const char *name;
 449
 450         DBG("disconnect provider %p:", provider);
 451
 452         if (data == NULL)
 453                 return 0;
 454
 455         name = vpn_provider_get_driver_name(provider);
 456         if (name == NULL)
 457                 return 0;
 458
 459         vpn_driver_data = g_hash_table_lookup(driver_hash, name);
 460         if (vpn_driver_data->vpn_driver->disconnect)
 461                 vpn_driver_data->vpn_driver->disconnect();
 462
 463         if (data->watch != 0) {
 464                 vpn_provider_unref(provider);
 465                 vpn_rtnl_remove_watch(data->watch);
 466                 data->watch = 0;
 467         }
 468
 469         data->state = VPN_STATE_DISCONNECT;
 470         connman_task_stop(data->task);
 471
 472         return 0;
 473 }
 474
 475 static int vpn_remove(struct vpn_provider *provider)
 476 {
 477         struct vpn_data *data;
 478
 479         data = vpn_provider_get_data(provider);
 480         if (data == NULL)
 481                 return 0;
 482
 483         if (data->watch != 0) {
 484                 vpn_provider_unref(provider);
 485                 vpn_rtnl_remove_watch(data->watch);
 486                 data->watch = 0;
 487         }
 488
 489         connman_task_stop(data->task);
 490
 491         g_usleep(G_USEC_PER_SEC);
 492         stop_vpn(provider);
 493         return 0;
 494 }
 495
 496 static int vpn_save(struct vpn_provider *provider, GKeyFile *keyfile)
 497 {
 498         struct vpn_driver_data *vpn_driver_data;
 499         const char *name;
 500
 501         name = vpn_provider_get_driver_name(provider);
 502         vpn_driver_data = g_hash_table_lookup(driver_hash, name);
 503         if (vpn_driver_data != NULL &&
 504                         vpn_driver_data->vpn_driver->save != NULL)
 505                 return vpn_driver_data->vpn_driver->save(provider, keyfile);
 506
 507         return 0;
 508 }
 509
 510 int vpn_register(const char *name, struct vpn_driver *vpn_driver,
 511                         const char *program)
 512 {
 513         struct vpn_driver_data *data;
 514
 515         data = g_try_new0(struct vpn_driver_data, 1);
 516         if (data == NULL)
 517                 return -ENOMEM;
 518
 519         data->name = name;
 520         data->program = program;
 521
 522         data->vpn_driver = vpn_driver;
 523
 524         data->provider_driver.name = name;
 525         data->provider_driver.disconnect = vpn_disconnect;
 526         data->provider_driver.connect = vpn_connect;
 527         data->provider_driver.probe = vpn_probe;
 528         data->provider_driver.remove = vpn_remove;
 529         data->provider_driver.save = vpn_save;
 530
 531         if (driver_hash == NULL)
 532                 driver_hash = g_hash_table_new_full(g_str_hash,
 533                                                         g_str_equal,
 534                                                         NULL, g_free);
 535
 536         if (driver_hash == NULL) {
 537                 connman_error("driver_hash not initialized for %s", name);
 538                 g_free(data);
 539                 return -ENOMEM;
 540         }
 541
 542         g_hash_table_replace(driver_hash, (char *)name, data);
 543
 544         vpn_provider_driver_register(&data->provider_driver);
 545
 546         return 0;
 547 }
 548
 549 void vpn_unregister(const char *name)
 550 {
 551         struct vpn_driver_data *data;
 552
 553         data = g_hash_table_lookup(driver_hash, name);
 554         if (data == NULL)
 555                 return;
 556
 557         vpn_provider_driver_unregister(&data->provider_driver);
 558
 559         g_hash_table_remove(driver_hash, name);
 560
 561         if (g_hash_table_size(driver_hash) == 0)
 562                 g_hash_table_destroy(driver_hash);
 563 }