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         } else
 163                 vpn_provider_set_state(provider, VPN_PROVIDER_STATE_IDLE);
 164
 165         vpn_provider_set_index(provider, -1);
 166
 167         if (data != NULL) {
 168                 vpn_provider_unref(data->provider);
 169                 g_free(data->if_name);
 170                 g_free(data);
 171         }
 172
 173         connman_task_destroy(task);
 174 }
 175
 176 int vpn_set_ifname(struct vpn_provider *provider, const char *ifname)
 177 {
 178         struct vpn_data *data = vpn_provider_get_data(provider);
 179         int index;
 180
 181         if (ifname == NULL || data == NULL)
 182                 return  -EIO;
 183
 184         index = connman_inet_ifindex(ifname);
 185         if (index < 0)
 186                 return  -EIO;
 187
 188         if (data->if_name != NULL)
 189                 g_free(data->if_name);
 190
 191         data->if_name = (char *)g_strdup(ifname);
 192         vpn_provider_set_index(provider, index);
 193
 194         return 0;
 195 }
 196
 197 static void vpn_newlink(unsigned flags, unsigned change, void *user_data)
 198 {
 199         struct vpn_provider *provider = user_data;
 200         struct vpn_data *data = vpn_provider_get_data(provider);
 201
 202         if ((data->flags & IFF_UP) != (flags & IFF_UP)) {
 203                 if (flags & IFF_UP) {
 204                         data->state = VPN_STATE_READY;
 205                         vpn_provider_set_state(provider,
 206                                         VPN_PROVIDER_STATE_READY);
 207                 }
 208         }
 209         data->flags = flags;
 210 }
 211
 212 static DBusMessage *vpn_notify(struct connman_task *task,
 213                         DBusMessage *msg, void *user_data)
 214 {
 215         struct vpn_provider *provider = user_data;
 216         struct vpn_data *data;
 217         struct vpn_driver_data *vpn_driver_data;
 218         const char *name;
 219         int state, index, err;
 220
 221         data = vpn_provider_get_data(provider);
 222
 223         name = vpn_provider_get_driver_name(provider);
 224         if (name == NULL)
 225                 return NULL;
 226
 227         vpn_driver_data = g_hash_table_lookup(driver_hash, name);
 228         if (vpn_driver_data == NULL)
 229                 return NULL;
 230
 231         state = vpn_driver_data->vpn_driver->notify(msg, provider);
 232         switch (state) {
 233         case VPN_STATE_CONNECT:
 234         case VPN_STATE_READY:
 235                 index = vpn_provider_get_index(provider);
 236                 vpn_provider_ref(provider);
 237                 data->watch = vpn_rtnl_add_newlink_watch(index,
 238                                                      vpn_newlink, provider);
 239                 err = connman_inet_ifup(index);
 240                 if (err < 0) {
 241                         if (err == -EALREADY)
 242                                 /*
 243                                  * So the interface is up already, that is just
 244                                  * great. Unfortunately in this case the
 245                                  * newlink watch might not have been called at
 246                                  * all. We must manually call it here so that
 247                                  * the provider can go to ready state and the
 248                                  * routes are setup properly.
 249                                  */
 250                                 vpn_newlink(IFF_UP, 0, provider);
 251                         else
 252                                 DBG("Cannot take interface %d up err %d/%s",
 253                                         index, -err, strerror(-err));
 254                 }
 255                 break;
 256
 257         case VPN_STATE_UNKNOWN:
 258         case VPN_STATE_IDLE:
 259         case VPN_STATE_DISCONNECT:
 260         case VPN_STATE_FAILURE:
 261                 vpn_provider_set_state(provider,
 262                                         VPN_PROVIDER_STATE_DISCONNECT);
 263                 break;
 264
 265         case VPN_STATE_AUTH_FAILURE:
 266                 vpn_provider_indicate_error(provider,
 267                                         VPN_PROVIDER_ERROR_AUTH_FAILED);
 268                 break;
 269         }
 270
 271         return NULL;
 272 }
 273
 274 static int vpn_create_tun(struct vpn_provider *provider)
 275 {
 276         struct vpn_data *data = vpn_provider_get_data(provider);
 277         struct ifreq ifr;
 278         int i, fd, index;
 279         int ret = 0;
 280
 281         if (data == NULL)
 282                 return -EISCONN;
 283
 284         fd = open("/dev/net/tun", O_RDWR | O_CLOEXEC);
 285         if (fd < 0) {
 286                 i = -errno;
 287                 connman_error("Failed to open /dev/net/tun: %s",
 288                               strerror(errno));
 289                 ret = i;
 290                 goto exist_err;
 291         }
 292
 293         memset(&ifr, 0, sizeof(ifr));
 294         ifr.ifr_flags = IFF_TUN | IFF_NO_PI;
 295
 296         for (i = 0; i < 256; i++) {
 297                 sprintf(ifr.ifr_name, "vpn%d", i);
 298
 299                 if (!ioctl(fd, TUNSETIFF, (void *)&ifr))
 300                         break;
 301         }
 302
 303         if (i == 256) {
 304                 connman_error("Failed to find available tun device");
 305                 close(fd);
 306                 ret = -ENODEV;
 307                 goto exist_err;
 308         }
 309
 310         data->if_name = (char *)g_strdup(ifr.ifr_name);
 311         if (data->if_name == NULL) {
 312                 connman_error("Failed to allocate memory");
 313                 close(fd);
 314                 ret = -ENOMEM;
 315                 goto exist_err;
 316         }
 317
 318         if (ioctl(fd, TUNSETPERSIST, 1)) {
 319                 i = -errno;
 320                 connman_error("Failed to set tun persistent: %s",
 321                               strerror(errno));
 322                 close(fd);
 323                 ret = i;
 324                 goto exist_err;
 325         }
 326
 327         close(fd);
 328
 329         index = connman_inet_ifindex(data->if_name);
 330         if (index < 0) {
 331                 connman_error("Failed to get tun ifindex");
 332                 stop_vpn(provider);
 333                 ret = -EIO;
 334                 goto exist_err;
 335         }
 336         vpn_provider_set_index(provider, index);
 337
 338         return 0;
 339
 340 exist_err:
 341         return ret;
 342 }
 343
 344 static int vpn_connect(struct vpn_provider *provider)
 345 {
 346         struct vpn_data *data = vpn_provider_get_data(provider);
 347         struct vpn_driver_data *vpn_driver_data;
 348         const char *name;
 349         int ret = 0;
 350
 351         if (data != NULL)
 352                 return -EISCONN;
 353
 354         data = g_try_new0(struct vpn_data, 1);
 355         if (data == NULL)
 356                 return -ENOMEM;
 357
 358         data->provider = vpn_provider_ref(provider);
 359         data->watch = 0;
 360         data->flags = 0;
 361         data->task = NULL;
 362         data->state = VPN_STATE_IDLE;
 363
 364         vpn_provider_set_data(provider, data);
 365
 366         name = vpn_provider_get_driver_name(provider);
 367         if (name == NULL)
 368                 return -EINVAL;
 369
 370         vpn_driver_data = g_hash_table_lookup(driver_hash, name);
 371
 372         if (vpn_driver_data == NULL || vpn_driver_data->vpn_driver == NULL) {
 373                 ret = -EINVAL;
 374                 goto exist_err;
 375         }
 376
 377         if (vpn_driver_data->vpn_driver->flags != VPN_FLAG_NO_TUN) {
 378                 ret = vpn_create_tun(provider);
 379                 if (ret < 0)
 380                         goto exist_err;
 381         }
 382
 383         data->task = connman_task_create(vpn_driver_data->program);
 384
 385         if (data->task == NULL) {
 386                 ret = -ENOMEM;
 387                 stop_vpn(provider);
 388                 goto exist_err;
 389         }
 390
 391         if (connman_task_set_notify(data->task, "notify",
 392                                         vpn_notify, provider)) {
 393                 ret = -ENOMEM;
 394                 stop_vpn(provider);
 395                 connman_task_destroy(data->task);
 396                 data->task = NULL;
 397                 goto exist_err;
 398         }
 399
 400         ret = vpn_driver_data->vpn_driver->connect(provider, data->task,
 401                                                         data->if_name);
 402         if (ret < 0) {
 403                 stop_vpn(provider);
 404                 connman_task_destroy(data->task);
 405                 data->task = NULL;
 406                 goto exist_err;
 407         }
 408
 409         DBG("%s started with dev %s",
 410                 vpn_driver_data->provider_driver.name, data->if_name);
 411
 412         data->state = VPN_STATE_CONNECT;
 413
 414         return -EINPROGRESS;
 415
 416 exist_err:
 417         vpn_provider_set_index(provider, -1);
 418         vpn_provider_set_data(provider, NULL);
 419         vpn_provider_unref(data->provider);
 420         g_free(data->if_name);
 421         g_free(data);
 422
 423         return ret;
 424 }
 425
 426 static int vpn_probe(struct vpn_provider *provider)
 427 {
 428         return 0;
 429 }
 430
 431 static int vpn_disconnect(struct vpn_provider *provider)
 432 {
 433         struct vpn_data *data = vpn_provider_get_data(provider);
 434         struct vpn_driver_data *vpn_driver_data;
 435         const char *name;
 436
 437         DBG("disconnect provider %p:", provider);
 438
 439         if (data == NULL)
 440                 return 0;
 441
 442         name = vpn_provider_get_driver_name(provider);
 443         if (name == NULL)
 444                 return 0;
 445
 446         vpn_driver_data = g_hash_table_lookup(driver_hash, name);
 447         if (vpn_driver_data->vpn_driver->disconnect)
 448                 vpn_driver_data->vpn_driver->disconnect();
 449
 450         if (data->watch != 0) {
 451                 vpn_provider_unref(provider);
 452                 vpn_rtnl_remove_watch(data->watch);
 453                 data->watch = 0;
 454         }
 455
 456         data->state = VPN_STATE_DISCONNECT;
 457         connman_task_stop(data->task);
 458
 459         return 0;
 460 }
 461
 462 static int vpn_remove(struct vpn_provider *provider)
 463 {
 464         struct vpn_data *data;
 465
 466         data = vpn_provider_get_data(provider);
 467         if (data == NULL)
 468                 return 0;
 469
 470         if (data->watch != 0) {
 471                 vpn_provider_unref(provider);
 472                 vpn_rtnl_remove_watch(data->watch);
 473                 data->watch = 0;
 474         }
 475
 476         connman_task_stop(data->task);
 477
 478         g_usleep(G_USEC_PER_SEC);
 479         stop_vpn(provider);
 480         return 0;
 481 }
 482
 483 static int vpn_save(struct vpn_provider *provider, GKeyFile *keyfile)
 484 {
 485         struct vpn_driver_data *vpn_driver_data;
 486         const char *name;
 487
 488         name = vpn_provider_get_driver_name(provider);
 489         vpn_driver_data = g_hash_table_lookup(driver_hash, name);
 490         if (vpn_driver_data != NULL &&
 491                         vpn_driver_data->vpn_driver->save != NULL)
 492                 return vpn_driver_data->vpn_driver->save(provider, keyfile);
 493
 494         return 0;
 495 }
 496
 497 int vpn_register(const char *name, struct vpn_driver *vpn_driver,
 498                         const char *program)
 499 {
 500         struct vpn_driver_data *data;
 501
 502         data = g_try_new0(struct vpn_driver_data, 1);
 503         if (data == NULL)
 504                 return -ENOMEM;
 505
 506         data->name = name;
 507         data->program = program;
 508
 509         data->vpn_driver = vpn_driver;
 510
 511         data->provider_driver.name = name;
 512         data->provider_driver.disconnect = vpn_disconnect;
 513         data->provider_driver.connect = vpn_connect;
 514         data->provider_driver.probe = vpn_probe;
 515         data->provider_driver.remove = vpn_remove;
 516         data->provider_driver.save = vpn_save;
 517
 518         if (driver_hash == NULL)
 519                 driver_hash = g_hash_table_new_full(g_str_hash,
 520                                                         g_str_equal,
 521                                                         NULL, g_free);
 522
 523         if (driver_hash == NULL) {
 524                 connman_error("driver_hash not initialized for %s", name);
 525                 g_free(data);
 526                 return -ENOMEM;
 527         }
 528
 529         g_hash_table_replace(driver_hash, (char *)name, data);
 530
 531         vpn_provider_driver_register(&data->provider_driver);
 532
 533         return 0;
 534 }
 535
 536 void vpn_unregister(const char *name)
 537 {
 538         struct vpn_driver_data *data;
 539
 540         data = g_hash_table_lookup(driver_hash, name);
 541         if (data == NULL)
 542                 return;
 543
 544         vpn_provider_driver_unregister(&data->provider_driver);
 545
 546         g_hash_table_remove(driver_hash, name);
 547
 548         if (g_hash_table_size(driver_hash) == 0)
 549                 g_hash_table_destroy(driver_hash);
 550 }