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         if (name == NULL)
 227                 return NULL;
 228
 229         vpn_driver_data = g_hash_table_lookup(driver_hash, name);
 230         if (vpn_driver_data == NULL)
 231                 return NULL;
 232
 233         state = vpn_driver_data->vpn_driver->notify(msg, provider);
 234         switch (state) {
 235         case VPN_STATE_CONNECT:
 236         case VPN_STATE_READY:
 237                 index = vpn_provider_get_index(provider);
 238                 vpn_provider_ref(provider);
 239                 data->watch = vpn_rtnl_add_newlink_watch(index,
 240                                                      vpn_newlink, provider);
 241                 err = connman_inet_ifup(index);
 242                 if (err < 0) {
 243                         if (err == -EALREADY)
 244                                 /*
 245                                  * So the interface is up already, that is just
 246                                  * great. Unfortunately in this case the
 247                                  * newlink watch might not have been called at
 248                                  * all. We must manually call it here so that
 249                                  * the provider can go to ready state and the
 250                                  * routes are setup properly.
 251                                  */
 252                                 vpn_newlink(IFF_UP, 0, provider);
 253                         else
 254                                 DBG("Cannot take interface %d up err %d/%s",
 255                                         index, -err, strerror(-err));
 256                 }
 257                 break;
 258
 259         case VPN_STATE_UNKNOWN:
 260         case VPN_STATE_IDLE:
 261         case VPN_STATE_DISCONNECT:
 262         case VPN_STATE_FAILURE:
 263                 vpn_provider_set_state(provider,
 264                                         VPN_PROVIDER_STATE_DISCONNECT);
 265                 break;
 266
 267         case VPN_STATE_AUTH_FAILURE:
 268                 vpn_provider_indicate_error(provider,
 269                                         VPN_PROVIDER_ERROR_AUTH_FAILED);
 270                 break;
 271         }
 272
 273         return NULL;
 274 }
 275
 276 static int vpn_create_tun(struct vpn_provider *provider)
 277 {
 278         struct vpn_data *data = vpn_provider_get_data(provider);
 279         struct ifreq ifr;
 280         int i, fd, index;
 281         int ret = 0;
 282
 283         if (data == NULL)
 284                 return -EISCONN;
 285
 286         fd = open("/dev/net/tun", O_RDWR | O_CLOEXEC);
 287         if (fd < 0) {
 288                 i = -errno;
 289                 connman_error("Failed to open /dev/net/tun: %s",
 290                               strerror(errno));
 291                 ret = i;
 292                 goto exist_err;
 293         }
 294
 295         memset(&ifr, 0, sizeof(ifr));
 296         ifr.ifr_flags = IFF_TUN | IFF_NO_PI;
 297
 298         for (i = 0; i < 256; i++) {
 299                 sprintf(ifr.ifr_name, "vpn%d", i);
 300
 301                 if (!ioctl(fd, TUNSETIFF, (void *)&ifr))
 302                         break;
 303         }
 304
 305         if (i == 256) {
 306                 connman_error("Failed to find available tun device");
 307                 close(fd);
 308                 ret = -ENODEV;
 309                 goto exist_err;
 310         }
 311
 312         data->if_name = (char *)g_strdup(ifr.ifr_name);
 313         if (data->if_name == NULL) {
 314                 connman_error("Failed to allocate memory");
 315                 close(fd);
 316                 ret = -ENOMEM;
 317                 goto exist_err;
 318         }
 319
 320         if (ioctl(fd, TUNSETPERSIST, 1)) {
 321                 i = -errno;
 322                 connman_error("Failed to set tun persistent: %s",
 323                               strerror(errno));
 324                 close(fd);
 325                 ret = i;
 326                 goto exist_err;
 327         }
 328
 329         close(fd);
 330
 331         index = connman_inet_ifindex(data->if_name);
 332         if (index < 0) {
 333                 connman_error("Failed to get tun ifindex");
 334                 stop_vpn(provider);
 335                 ret = -EIO;
 336                 goto exist_err;
 337         }
 338         vpn_provider_set_index(provider, index);
 339
 340         return 0;
 341
 342 exist_err:
 343         return ret;
 344 }
 345
 346 static int vpn_connect(struct vpn_provider *provider)
 347 {
 348         struct vpn_data *data = vpn_provider_get_data(provider);
 349         struct vpn_driver_data *vpn_driver_data;
 350         const char *name;
 351         int ret = 0;
 352
 353         if (data != NULL)
 354                 return -EISCONN;
 355
 356         data = g_try_new0(struct vpn_data, 1);
 357         if (data == NULL)
 358                 return -ENOMEM;
 359
 360         data->provider = vpn_provider_ref(provider);
 361         data->watch = 0;
 362         data->flags = 0;
 363         data->task = NULL;
 364         data->state = VPN_STATE_IDLE;
 365
 366         vpn_provider_set_data(provider, data);
 367
 368         name = vpn_provider_get_driver_name(provider);
 369         if (name == NULL)
 370                 return -EINVAL;
 371
 372         vpn_driver_data = g_hash_table_lookup(driver_hash, name);
 373
 374         if (vpn_driver_data == NULL || vpn_driver_data->vpn_driver == NULL) {
 375                 ret = -EINVAL;
 376                 goto exist_err;
 377         }
 378
 379         if (vpn_driver_data->vpn_driver->flags != VPN_FLAG_NO_TUN) {
 380                 ret = vpn_create_tun(provider);
 381                 if (ret < 0)
 382                         goto exist_err;
 383         }
 384
 385         data->task = connman_task_create(vpn_driver_data->program);
 386
 387         if (data->task == NULL) {
 388                 ret = -ENOMEM;
 389                 stop_vpn(provider);
 390                 goto exist_err;
 391         }
 392
 393         if (connman_task_set_notify(data->task, "notify",
 394                                         vpn_notify, provider)) {
 395                 ret = -ENOMEM;
 396                 stop_vpn(provider);
 397                 connman_task_destroy(data->task);
 398                 data->task = NULL;
 399                 goto exist_err;
 400         }
 401
 402         ret = vpn_driver_data->vpn_driver->connect(provider, data->task,
 403                                                         data->if_name);
 404         if (ret < 0) {
 405                 stop_vpn(provider);
 406                 connman_task_destroy(data->task);
 407                 data->task = NULL;
 408                 goto exist_err;
 409         }
 410
 411         DBG("%s started with dev %s",
 412                 vpn_driver_data->provider_driver.name, data->if_name);
 413
 414         data->state = VPN_STATE_CONNECT;
 415
 416         return -EINPROGRESS;
 417
 418 exist_err:
 419         vpn_provider_set_index(provider, -1);
 420         vpn_provider_set_data(provider, NULL);
 421         vpn_provider_unref(data->provider);
 422         g_free(data->if_name);
 423         g_free(data);
 424
 425         return ret;
 426 }
 427
 428 static int vpn_probe(struct vpn_provider *provider)
 429 {
 430         return 0;
 431 }
 432
 433 static int vpn_disconnect(struct vpn_provider *provider)
 434 {
 435         struct vpn_data *data = vpn_provider_get_data(provider);
 436         struct vpn_driver_data *vpn_driver_data;
 437         const char *name;
 438
 439         DBG("disconnect provider %p:", provider);
 440
 441         if (data == NULL)
 442                 return 0;
 443
 444         name = vpn_provider_get_driver_name(provider);
 445         if (name == NULL)
 446                 return 0;
 447
 448         vpn_driver_data = g_hash_table_lookup(driver_hash, name);
 449         if (vpn_driver_data->vpn_driver->disconnect)
 450                 vpn_driver_data->vpn_driver->disconnect();
 451
 452         if (data->watch != 0) {
 453                 vpn_provider_unref(provider);
 454                 vpn_rtnl_remove_watch(data->watch);
 455                 data->watch = 0;
 456         }
 457
 458         data->state = VPN_STATE_DISCONNECT;
 459         connman_task_stop(data->task);
 460
 461         return 0;
 462 }
 463
 464 static int vpn_remove(struct vpn_provider *provider)
 465 {
 466         struct vpn_data *data;
 467
 468         data = vpn_provider_get_data(provider);
 469         if (data == NULL)
 470                 return 0;
 471
 472         if (data->watch != 0) {
 473                 vpn_provider_unref(provider);
 474                 vpn_rtnl_remove_watch(data->watch);
 475                 data->watch = 0;
 476         }
 477
 478         connman_task_stop(data->task);
 479
 480         g_usleep(G_USEC_PER_SEC);
 481         stop_vpn(provider);
 482         return 0;
 483 }
 484
 485 static int vpn_save(struct vpn_provider *provider, GKeyFile *keyfile)
 486 {
 487         struct vpn_driver_data *vpn_driver_data;
 488         const char *name;
 489
 490         name = vpn_provider_get_driver_name(provider);
 491         vpn_driver_data = g_hash_table_lookup(driver_hash, name);
 492         if (vpn_driver_data != NULL &&
 493                         vpn_driver_data->vpn_driver->save != NULL)
 494                 return vpn_driver_data->vpn_driver->save(provider, keyfile);
 495
 496         return 0;
 497 }
 498
 499 int vpn_register(const char *name, struct vpn_driver *vpn_driver,
 500                         const char *program)
 501 {
 502         struct vpn_driver_data *data;
 503
 504         data = g_try_new0(struct vpn_driver_data, 1);
 505         if (data == NULL)
 506                 return -ENOMEM;
 507
 508         data->name = name;
 509         data->program = program;
 510
 511         data->vpn_driver = vpn_driver;
 512
 513         data->provider_driver.name = name;
 514         data->provider_driver.disconnect = vpn_disconnect;
 515         data->provider_driver.connect = vpn_connect;
 516         data->provider_driver.probe = vpn_probe;
 517         data->provider_driver.remove = vpn_remove;
 518         data->provider_driver.save = vpn_save;
 519
 520         if (driver_hash == NULL)
 521                 driver_hash = g_hash_table_new_full(g_str_hash,
 522                                                         g_str_equal,
 523                                                         NULL, g_free);
 524
 525         if (driver_hash == NULL) {
 526                 connman_error("driver_hash not initialized for %s", name);
 527                 g_free(data);
 528                 return -ENOMEM;
 529         }
 530
 531         g_hash_table_replace(driver_hash, (char *)name, data);
 532
 533         vpn_provider_driver_register(&data->provider_driver);
 534
 535         return 0;
 536 }
 537
 538 void vpn_unregister(const char *name)
 539 {
 540         struct vpn_driver_data *data;
 541
 542         data = g_hash_table_lookup(driver_hash, name);
 543         if (data == NULL)
 544                 return;
 545
 546         vpn_provider_driver_unregister(&data->provider_driver);
 547
 548         g_hash_table_remove(driver_hash, name);
 549
 550         if (g_hash_table_size(driver_hash) == 0)
 551                 g_hash_table_destroy(driver_hash);
 552 }