vpn/plugins/vpn.c

   1 /*
   2  *
   3  *  ConnMan VPN daemon
   4  *
   5  *  Copyright (C) 2007-2013  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         enum vpn_state 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)
  79                 return -EINVAL;
  80
  81         name = vpn_provider_get_driver_name(provider);
  82         if (!name)
  83                 return -EINVAL;
  84
  85         vpn_driver_data = g_hash_table_lookup(driver_hash, name);
  86
  87         if (vpn_driver_data && vpn_driver_data->vpn_driver &&
  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)
 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_rtnl_remove_watch(data->watch);
 142                 data->watch = 0;
 143                 vpn_provider_unref(provider);
 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)
 153                         vpn_data = g_hash_table_lookup(driver_hash, name);
 154
 155                 if (vpn_data &&
 156                                 vpn_data->vpn_driver->error_code)
 157                         ret = vpn_data->vpn_driver->error_code(provider,
 158                                         exit_code);
 159                 else
 160                         ret = VPN_PROVIDER_ERROR_UNKNOWN;
 161
 162                 vpn_provider_indicate_error(provider, ret);
 163         } else
 164                 vpn_provider_set_state(provider, VPN_PROVIDER_STATE_IDLE);
 165
 166         vpn_provider_set_index(provider, -1);
 167
 168         if (data) {
 169                 vpn_provider_unref(data->provider);
 170                 g_free(data->if_name);
 171                 g_free(data);
 172         }
 173
 174         connman_task_destroy(task);
 175 }
 176
 177 int vpn_set_ifname(struct vpn_provider *provider, const char *ifname)
 178 {
 179         struct vpn_data *data = vpn_provider_get_data(provider);
 180         int index;
 181
 182         if (!ifname || !data)
 183                 return  -EIO;
 184
 185         index = connman_inet_ifindex(ifname);
 186         if (index < 0)
 187                 return  -EIO;
 188
 189         if (data->if_name)
 190                 g_free(data->if_name);
 191
 192         data->if_name = (char *)g_strdup(ifname);
 193         vpn_provider_set_index(provider, index);
 194
 195         return 0;
 196 }
 197
 198 static void vpn_newlink(unsigned flags, unsigned change, void *user_data)
 199 {
 200         struct vpn_provider *provider = user_data;
 201         struct vpn_data *data = vpn_provider_get_data(provider);
 202
 203         if ((data->flags & IFF_UP) != (flags & IFF_UP)) {
 204                 if (flags & IFF_UP) {
 205                         data->state = VPN_STATE_READY;
 206                         vpn_provider_set_state(provider,
 207                                         VPN_PROVIDER_STATE_READY);
 208                 }
 209         }
 210         data->flags = flags;
 211 }
 212
 213 static DBusMessage *vpn_notify(struct connman_task *task,
 214                         DBusMessage *msg, void *user_data)
 215 {
 216         struct vpn_provider *provider = user_data;
 217         struct vpn_data *data;
 218         struct vpn_driver_data *vpn_driver_data;
 219         const char *name;
 220         int state, index, err;
 221
 222         data = vpn_provider_get_data(provider);
 223
 224         name = vpn_provider_get_driver_name(provider);
 225
 226         if (!name) {
 227                 DBG("Cannot find VPN driver for provider %p", provider);
 228                 vpn_provider_set_state(provider, VPN_PROVIDER_STATE_FAILURE);
 229                 return NULL;
 230         }
 231
 232         vpn_driver_data = g_hash_table_lookup(driver_hash, name);
 233         if (!vpn_driver_data) {
 234                 DBG("Cannot find VPN driver data for name %s", name);
 235                 vpn_provider_set_state(provider, VPN_PROVIDER_STATE_FAILURE);
 236                 return NULL;
 237         }
 238
 239         state = vpn_driver_data->vpn_driver->notify(msg, provider);
 240
 241         DBG("provider %p driver %s state %d", provider, name, state);
 242
 243         switch (state) {
 244         case VPN_STATE_CONNECT:
 245         case VPN_STATE_READY:
 246                 if (data->state == VPN_STATE_READY) {
 247                         /*
 248                          * This is the restart case, in which case we must
 249                          * just set the IP address.
 250                          *
 251                          * We need to remove first the old address, just
 252                          * replacing the old address will not work as expected
 253                          * because the old address will linger in the interface
 254                          * and not disapper so the clearing is needed here.
 255                          *
 256                          * Also the state must change, otherwise the routes
 257                          * will not be set properly.
 258                          */
 259                         vpn_provider_set_state(provider,
 260                                                 VPN_PROVIDER_STATE_CONNECT);
 261
 262                         vpn_provider_clear_address(provider, AF_INET);
 263                         vpn_provider_clear_address(provider, AF_INET6);
 264
 265                         vpn_provider_change_address(provider);
 266                         vpn_provider_set_state(provider,
 267                                                 VPN_PROVIDER_STATE_READY);
 268                         break;
 269                 }
 270
 271                 index = vpn_provider_get_index(provider);
 272                 vpn_provider_ref(provider);
 273                 data->watch = vpn_rtnl_add_newlink_watch(index,
 274                                                      vpn_newlink, provider);
 275                 err = connman_inet_ifup(index);
 276                 if (err < 0) {
 277                         if (err == -EALREADY)
 278                                 /*
 279                                  * So the interface is up already, that is just
 280                                  * great. Unfortunately in this case the
 281                                  * newlink watch might not have been called at
 282                                  * all. We must manually call it here so that
 283                                  * the provider can go to ready state and the
 284                                  * routes are setup properly.
 285                                  */
 286                                 vpn_newlink(IFF_UP, 0, provider);
 287                         else
 288                                 DBG("Cannot take interface %d up err %d/%s",
 289                                         index, -err, strerror(-err));
 290                 }
 291                 break;
 292
 293         case VPN_STATE_UNKNOWN:
 294         case VPN_STATE_IDLE:
 295         case VPN_STATE_DISCONNECT:
 296         case VPN_STATE_FAILURE:
 297                 vpn_provider_set_state(provider,
 298                                         VPN_PROVIDER_STATE_DISCONNECT);
 299                 break;
 300
 301         case VPN_STATE_AUTH_FAILURE:
 302                 vpn_provider_indicate_error(provider,
 303                                         VPN_PROVIDER_ERROR_AUTH_FAILED);
 304                 break;
 305         }
 306
 307         return NULL;
 308 }
 309
 310 static int vpn_create_tun(struct vpn_provider *provider)
 311 {
 312         struct vpn_data *data = vpn_provider_get_data(provider);
 313         struct ifreq ifr;
 314         int i, fd, index;
 315         int ret = 0;
 316
 317         if (!data)
 318                 return -EISCONN;
 319
 320         fd = open("/dev/net/tun", O_RDWR | O_CLOEXEC);
 321         if (fd < 0) {
 322                 i = -errno;
 323                 connman_error("Failed to open /dev/net/tun: %s",
 324                               strerror(errno));
 325                 ret = i;
 326                 goto exist_err;
 327         }
 328
 329         memset(&ifr, 0, sizeof(ifr));
 330         ifr.ifr_flags = IFF_TUN | IFF_NO_PI;
 331
 332         for (i = 0; i < 256; i++) {
 333                 sprintf(ifr.ifr_name, "vpn%d", i);
 334
 335                 if (!ioctl(fd, TUNSETIFF, (void *)&ifr))
 336                         break;
 337         }
 338
 339         if (i == 256) {
 340                 connman_error("Failed to find available tun device");
 341                 close(fd);
 342                 ret = -ENODEV;
 343                 goto exist_err;
 344         }
 345
 346         data->if_name = (char *)g_strdup(ifr.ifr_name);
 347         if (!data->if_name) {
 348                 connman_error("Failed to allocate memory");
 349                 close(fd);
 350                 ret = -ENOMEM;
 351                 goto exist_err;
 352         }
 353
 354         if (ioctl(fd, TUNSETPERSIST, 1)) {
 355                 i = -errno;
 356                 connman_error("Failed to set tun persistent: %s",
 357                               strerror(errno));
 358                 close(fd);
 359                 ret = i;
 360                 goto exist_err;
 361         }
 362
 363         close(fd);
 364
 365         index = connman_inet_ifindex(data->if_name);
 366         if (index < 0) {
 367                 connman_error("Failed to get tun ifindex");
 368                 stop_vpn(provider);
 369                 ret = -EIO;
 370                 goto exist_err;
 371         }
 372         vpn_provider_set_index(provider, index);
 373
 374         return 0;
 375
 376 exist_err:
 377         return ret;
 378 }
 379
 380 static int vpn_connect(struct vpn_provider *provider,
 381                         vpn_provider_connect_cb_t cb,
 382                         const char *dbus_sender, void *user_data)
 383 {
 384         struct vpn_data *data = vpn_provider_get_data(provider);
 385         struct vpn_driver_data *vpn_driver_data;
 386         const char *name;
 387         int ret = 0;
 388         enum vpn_state state = VPN_STATE_UNKNOWN;
 389
 390         if (data)
 391                 state = data->state;
 392
 393         DBG("data %p state %d", data, state);
 394
 395         switch (state) {
 396         case VPN_STATE_UNKNOWN:
 397                 data = g_try_new0(struct vpn_data, 1);
 398                 if (!data)
 399                         return -ENOMEM;
 400
 401                 data->provider = vpn_provider_ref(provider);
 402                 data->watch = 0;
 403                 data->flags = 0;
 404                 data->task = NULL;
 405
 406                 vpn_provider_set_data(provider, data);
 407                 /* fall through */
 408
 409         case VPN_STATE_DISCONNECT:
 410         case VPN_STATE_IDLE:
 411         case VPN_STATE_FAILURE:
 412         case VPN_STATE_AUTH_FAILURE:
 413                 data->state = VPN_STATE_IDLE;
 414                 break;
 415
 416         case VPN_STATE_CONNECT:
 417                 return -EINPROGRESS;
 418
 419         case VPN_STATE_READY:
 420                 return -EISCONN;
 421         }
 422
 423         name = vpn_provider_get_driver_name(provider);
 424         if (!name)
 425                 return -EINVAL;
 426
 427         vpn_driver_data = g_hash_table_lookup(driver_hash, name);
 428
 429         if (!vpn_driver_data || !vpn_driver_data->vpn_driver) {
 430                 ret = -EINVAL;
 431                 goto exist_err;
 432         }
 433
 434         if (vpn_driver_data->vpn_driver->flags != VPN_FLAG_NO_TUN) {
 435                 ret = vpn_create_tun(provider);
 436                 if (ret < 0)
 437                         goto exist_err;
 438         }
 439
 440         data->task = connman_task_create(vpn_driver_data->program);
 441
 442         if (!data->task) {
 443                 ret = -ENOMEM;
 444                 stop_vpn(provider);
 445                 goto exist_err;
 446         }
 447
 448         if (connman_task_set_notify(data->task, "notify",
 449                                         vpn_notify, provider)) {
 450                 ret = -ENOMEM;
 451                 stop_vpn(provider);
 452                 connman_task_destroy(data->task);
 453                 data->task = NULL;
 454                 goto exist_err;
 455         }
 456
 457         ret = vpn_driver_data->vpn_driver->connect(provider, data->task,
 458                                                 data->if_name, cb, dbus_sender,
 459                                                 user_data);
 460         if (ret < 0 && ret != -EINPROGRESS) {
 461                 stop_vpn(provider);
 462                 connman_task_destroy(data->task);
 463                 data->task = NULL;
 464                 goto exist_err;
 465         }
 466
 467         DBG("%s started with dev %s",
 468                 vpn_driver_data->provider_driver.name, data->if_name);
 469
 470         data->state = VPN_STATE_CONNECT;
 471
 472         return -EINPROGRESS;
 473
 474 exist_err:
 475         vpn_provider_set_index(provider, -1);
 476         vpn_provider_set_data(provider, NULL);
 477         vpn_provider_unref(data->provider);
 478         g_free(data->if_name);
 479         g_free(data);
 480
 481         return ret;
 482 }
 483
 484 static int vpn_probe(struct vpn_provider *provider)
 485 {
 486         return 0;
 487 }
 488
 489 static int vpn_disconnect(struct vpn_provider *provider)
 490 {
 491         struct vpn_data *data = vpn_provider_get_data(provider);
 492         struct vpn_driver_data *vpn_driver_data;
 493         const char *name;
 494
 495         DBG("disconnect provider %p:", provider);
 496
 497         if (!data)
 498                 return 0;
 499
 500         name = vpn_provider_get_driver_name(provider);
 501         if (!name)
 502                 return 0;
 503
 504         vpn_driver_data = g_hash_table_lookup(driver_hash, name);
 505         if (vpn_driver_data->vpn_driver->disconnect)
 506                 vpn_driver_data->vpn_driver->disconnect(provider);
 507
 508         if (data->watch != 0) {
 509                 vpn_provider_unref(provider);
 510                 vpn_rtnl_remove_watch(data->watch);
 511                 data->watch = 0;
 512         }
 513
 514         data->state = VPN_STATE_DISCONNECT;
 515         connman_task_stop(data->task);
 516
 517         return 0;
 518 }
 519
 520 static int vpn_remove(struct vpn_provider *provider)
 521 {
 522         struct vpn_data *data;
 523
 524         data = vpn_provider_get_data(provider);
 525         if (!data)
 526                 return 0;
 527
 528         if (data->watch != 0) {
 529                 vpn_provider_unref(provider);
 530                 vpn_rtnl_remove_watch(data->watch);
 531                 data->watch = 0;
 532         }
 533
 534         connman_task_stop(data->task);
 535
 536         g_usleep(G_USEC_PER_SEC);
 537         stop_vpn(provider);
 538         return 0;
 539 }
 540
 541 static int vpn_save(struct vpn_provider *provider, GKeyFile *keyfile)
 542 {
 543         struct vpn_driver_data *vpn_driver_data;
 544         const char *name;
 545
 546         name = vpn_provider_get_driver_name(provider);
 547         vpn_driver_data = g_hash_table_lookup(driver_hash, name);
 548         if (vpn_driver_data &&
 549                         vpn_driver_data->vpn_driver->save)
 550                 return vpn_driver_data->vpn_driver->save(provider, keyfile);
 551
 552         return 0;
 553 }
 554
 555 int vpn_register(const char *name, struct vpn_driver *vpn_driver,
 556                         const char *program)
 557 {
 558         struct vpn_driver_data *data;
 559
 560         data = g_try_new0(struct vpn_driver_data, 1);
 561         if (!data)
 562                 return -ENOMEM;
 563
 564         data->name = name;
 565         data->program = program;
 566
 567         data->vpn_driver = vpn_driver;
 568
 569         data->provider_driver.name = name;
 570         data->provider_driver.disconnect = vpn_disconnect;
 571         data->provider_driver.connect = vpn_connect;
 572         data->provider_driver.probe = vpn_probe;
 573         data->provider_driver.remove = vpn_remove;
 574         data->provider_driver.save = vpn_save;
 575
 576         if (!driver_hash)
 577                 driver_hash = g_hash_table_new_full(g_str_hash,
 578                                                         g_str_equal,
 579                                                         NULL, g_free);
 580
 581         if (!driver_hash) {
 582                 connman_error("driver_hash not initialized for %s", name);
 583                 g_free(data);
 584                 return -ENOMEM;
 585         }
 586
 587         g_hash_table_replace(driver_hash, (char *)name, data);
 588
 589         vpn_provider_driver_register(&data->provider_driver);
 590
 591         return 0;
 592 }
 593
 594 void vpn_unregister(const char *name)
 595 {
 596         struct vpn_driver_data *data;
 597
 598         data = g_hash_table_lookup(driver_hash, name);
 599         if (!data)
 600                 return;
 601
 602         vpn_provider_driver_unregister(&data->provider_driver);
 603
 604         g_hash_table_remove(driver_hash, name);
 605
 606         if (g_hash_table_size(driver_hash) == 0)
 607                 g_hash_table_destroy(driver_hash);
 608 }