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 void vpn_event(struct vpn_provider *provider, int state)
 311 {
 312         struct vpn_data *data;
 313         struct vpn_driver_data *vpn_driver_data;
 314         const char *name;
 315         int index, err;
 316
 317         data = vpn_provider_get_data(provider);
 318
 319         name = vpn_provider_get_driver_name(provider);
 320
 321         if (!name) {
 322                 DBG("Cannot find VPN driver for provider %p", provider);
 323                 vpn_provider_set_state(provider, VPN_PROVIDER_STATE_FAILURE);
 324                 return;
 325         }
 326
 327         vpn_driver_data = g_hash_table_lookup(driver_hash, name);
 328         if (!vpn_driver_data) {
 329                 DBG("Cannot find VPN driver data for name %s", name);
 330                 vpn_provider_set_state(provider, VPN_PROVIDER_STATE_FAILURE);
 331                 return;
 332         }
 333
 334         DBG("provider %p driver %s state %d", provider, name, state);
 335
 336         switch (state) {
 337         case VPN_STATE_CONNECT:
 338         case VPN_STATE_READY:
 339                 if (data->state == VPN_STATE_READY) {
 340                         /*
 341                          * This is the restart case, in which case we must
 342                          * just set the IP address.
 343                          *
 344                          * We need to remove first the old address, just
 345                          * replacing the old address will not work as expected
 346                          * because the old address will linger in the interface
 347                          * and not disapper so the clearing is needed here.
 348                          *
 349                          * Also the state must change, otherwise the routes
 350                          * will not be set properly.
 351                          */
 352                         vpn_provider_set_state(provider,
 353                                                 VPN_PROVIDER_STATE_CONNECT);
 354
 355                         vpn_provider_clear_address(provider, AF_INET);
 356                         vpn_provider_clear_address(provider, AF_INET6);
 357
 358                         vpn_provider_change_address(provider);
 359                         vpn_provider_set_state(provider,
 360                                                 VPN_PROVIDER_STATE_READY);
 361                         break;
 362                 }
 363
 364                 index = vpn_provider_get_index(provider);
 365                 vpn_provider_ref(provider);
 366                 data->watch = vpn_rtnl_add_newlink_watch(index,
 367                                                      vpn_newlink, provider);
 368                 err = connman_inet_ifup(index);
 369                 if (err < 0) {
 370                         if (err == -EALREADY)
 371                                 /*
 372                                  * So the interface is up already, that is just
 373                                  * great. Unfortunately in this case the
 374                                  * newlink watch might not have been called at
 375                                  * all. We must manually call it here so that
 376                                  * the provider can go to ready state and the
 377                                  * routes are setup properly.
 378                                  */
 379                                 vpn_newlink(IFF_UP, 0, provider);
 380                         else
 381                                 DBG("Cannot take interface %d up err %d/%s",
 382                                         index, -err, strerror(-err));
 383                 }
 384                 break;
 385
 386         case VPN_STATE_UNKNOWN:
 387         case VPN_STATE_IDLE:
 388         case VPN_STATE_DISCONNECT:
 389         case VPN_STATE_FAILURE:
 390                 vpn_provider_set_state(provider,
 391                                         VPN_PROVIDER_STATE_DISCONNECT);
 392                 break;
 393
 394         case VPN_STATE_AUTH_FAILURE:
 395                 vpn_provider_indicate_error(provider,
 396                                         VPN_PROVIDER_ERROR_AUTH_FAILED);
 397                 break;
 398         }
 399
 400         return;
 401 }
 402
 403 static int vpn_create_tun(struct vpn_provider *provider)
 404 {
 405         struct vpn_data *data = vpn_provider_get_data(provider);
 406         struct ifreq ifr;
 407         int i, fd, index;
 408         int ret = 0;
 409
 410         if (!data)
 411                 return -EISCONN;
 412
 413         fd = open("/dev/net/tun", O_RDWR | O_CLOEXEC);
 414         if (fd < 0) {
 415                 i = -errno;
 416                 connman_error("Failed to open /dev/net/tun: %s",
 417                               strerror(errno));
 418                 ret = i;
 419                 goto exist_err;
 420         }
 421
 422         memset(&ifr, 0, sizeof(ifr));
 423         ifr.ifr_flags = IFF_TUN | IFF_NO_PI;
 424
 425         for (i = 0; i < 256; i++) {
 426                 sprintf(ifr.ifr_name, "vpn%d", i);
 427
 428                 if (!ioctl(fd, TUNSETIFF, (void *)&ifr))
 429                         break;
 430         }
 431
 432         if (i == 256) {
 433                 connman_error("Failed to find available tun device");
 434                 close(fd);
 435                 ret = -ENODEV;
 436                 goto exist_err;
 437         }
 438
 439         data->if_name = (char *)g_strdup(ifr.ifr_name);
 440         if (!data->if_name) {
 441                 connman_error("Failed to allocate memory");
 442                 close(fd);
 443                 ret = -ENOMEM;
 444                 goto exist_err;
 445         }
 446
 447         if (ioctl(fd, TUNSETPERSIST, 1)) {
 448                 i = -errno;
 449                 connman_error("Failed to set tun persistent: %s",
 450                               strerror(errno));
 451                 close(fd);
 452                 ret = i;
 453                 goto exist_err;
 454         }
 455
 456         close(fd);
 457
 458         index = connman_inet_ifindex(data->if_name);
 459         if (index < 0) {
 460                 connman_error("Failed to get tun ifindex");
 461                 stop_vpn(provider);
 462                 ret = -EIO;
 463                 goto exist_err;
 464         }
 465         vpn_provider_set_index(provider, index);
 466
 467         return 0;
 468
 469 exist_err:
 470         return ret;
 471 }
 472
 473 static int vpn_connect(struct vpn_provider *provider,
 474                         vpn_provider_connect_cb_t cb,
 475                         const char *dbus_sender, void *user_data)
 476 {
 477         struct vpn_data *data = vpn_provider_get_data(provider);
 478         struct vpn_driver_data *vpn_driver_data;
 479         const char *name;
 480         int ret = 0;
 481         enum vpn_state state = VPN_STATE_UNKNOWN;
 482
 483         if (data)
 484                 state = data->state;
 485
 486         DBG("data %p state %d", data, state);
 487
 488         switch (state) {
 489         case VPN_STATE_UNKNOWN:
 490                 data = g_try_new0(struct vpn_data, 1);
 491                 if (!data)
 492                         return -ENOMEM;
 493
 494                 data->provider = vpn_provider_ref(provider);
 495                 data->watch = 0;
 496                 data->flags = 0;
 497                 data->task = NULL;
 498
 499                 vpn_provider_set_data(provider, data);
 500                 /* fall through */
 501
 502         case VPN_STATE_DISCONNECT:
 503         case VPN_STATE_IDLE:
 504         case VPN_STATE_FAILURE:
 505         case VPN_STATE_AUTH_FAILURE:
 506                 data->state = VPN_STATE_IDLE;
 507                 break;
 508
 509         case VPN_STATE_CONNECT:
 510                 return -EINPROGRESS;
 511
 512         case VPN_STATE_READY:
 513                 return -EISCONN;
 514         }
 515
 516         name = vpn_provider_get_driver_name(provider);
 517         if (!name)
 518                 return -EINVAL;
 519
 520         vpn_driver_data = g_hash_table_lookup(driver_hash, name);
 521
 522         if (!vpn_driver_data || !vpn_driver_data->vpn_driver) {
 523                 ret = -EINVAL;
 524                 goto exist_err;
 525         }
 526
 527         if (vpn_driver_data->vpn_driver->flags != VPN_FLAG_NO_TUN) {
 528                 ret = vpn_create_tun(provider);
 529                 if (ret < 0)
 530                         goto exist_err;
 531         }
 532
 533         data->task = connman_task_create(vpn_driver_data->program);
 534
 535         if (!data->task) {
 536                 ret = -ENOMEM;
 537                 stop_vpn(provider);
 538                 goto exist_err;
 539         }
 540
 541         if (connman_task_set_notify(data->task, "notify",
 542                                         vpn_notify, provider)) {
 543                 ret = -ENOMEM;
 544                 stop_vpn(provider);
 545                 connman_task_destroy(data->task);
 546                 data->task = NULL;
 547                 goto exist_err;
 548         }
 549
 550
 551         if(vpn_driver_data->vpn_driver->set_event_cb)
 552                 vpn_driver_data->vpn_driver->set_event_cb(vpn_event, provider);
 553
 554         ret = vpn_driver_data->vpn_driver->connect(provider, data->task,
 555                                                 data->if_name, cb, dbus_sender,
 556                                                 user_data);
 557         if (ret < 0 && ret != -EINPROGRESS) {
 558                 stop_vpn(provider);
 559                 connman_task_destroy(data->task);
 560                 data->task = NULL;
 561                 goto exist_err;
 562         }
 563
 564         DBG("%s started with dev %s",
 565                 vpn_driver_data->provider_driver.name, data->if_name);
 566
 567         data->state = VPN_STATE_CONNECT;
 568
 569         return -EINPROGRESS;
 570
 571 exist_err:
 572         vpn_provider_set_index(provider, -1);
 573         vpn_provider_set_data(provider, NULL);
 574         vpn_provider_unref(data->provider);
 575         g_free(data->if_name);
 576         g_free(data);
 577
 578         return ret;
 579 }
 580
 581 static int vpn_probe(struct vpn_provider *provider)
 582 {
 583         return 0;
 584 }
 585
 586 static int vpn_disconnect(struct vpn_provider *provider)
 587 {
 588         struct vpn_data *data = vpn_provider_get_data(provider);
 589         struct vpn_driver_data *vpn_driver_data;
 590         const char *name;
 591
 592         DBG("disconnect provider %p:", provider);
 593
 594         if (!data)
 595                 return 0;
 596
 597         name = vpn_provider_get_driver_name(provider);
 598         if (!name)
 599                 return 0;
 600
 601         vpn_driver_data = g_hash_table_lookup(driver_hash, name);
 602         if (vpn_driver_data->vpn_driver->disconnect)
 603                 vpn_driver_data->vpn_driver->disconnect(provider);
 604
 605         if (data->watch != 0) {
 606                 vpn_provider_unref(provider);
 607                 vpn_rtnl_remove_watch(data->watch);
 608                 data->watch = 0;
 609         }
 610
 611         data->state = VPN_STATE_DISCONNECT;
 612         connman_task_stop(data->task);
 613
 614         return 0;
 615 }
 616
 617 static int vpn_remove(struct vpn_provider *provider)
 618 {
 619         struct vpn_data *data;
 620
 621         data = vpn_provider_get_data(provider);
 622         if (!data)
 623                 return 0;
 624
 625         if (data->watch != 0) {
 626                 vpn_provider_unref(provider);
 627                 vpn_rtnl_remove_watch(data->watch);
 628                 data->watch = 0;
 629         }
 630
 631         connman_task_stop(data->task);
 632
 633         g_usleep(G_USEC_PER_SEC);
 634         stop_vpn(provider);
 635         return 0;
 636 }
 637
 638 static int vpn_save(struct vpn_provider *provider, GKeyFile *keyfile)
 639 {
 640         struct vpn_driver_data *vpn_driver_data;
 641         const char *name;
 642
 643         name = vpn_provider_get_driver_name(provider);
 644         vpn_driver_data = g_hash_table_lookup(driver_hash, name);
 645         if (vpn_driver_data &&
 646                         vpn_driver_data->vpn_driver->save)
 647                 return vpn_driver_data->vpn_driver->save(provider, keyfile);
 648
 649         return 0;
 650 }
 651
 652 int vpn_register(const char *name, struct vpn_driver *vpn_driver,
 653                         const char *program)
 654 {
 655         struct vpn_driver_data *data;
 656
 657         data = g_try_new0(struct vpn_driver_data, 1);
 658         if (!data)
 659                 return -ENOMEM;
 660
 661         data->name = name;
 662         data->program = program;
 663
 664         data->vpn_driver = vpn_driver;
 665
 666         data->provider_driver.name = name;
 667         data->provider_driver.disconnect = vpn_disconnect;
 668         data->provider_driver.connect = vpn_connect;
 669         data->provider_driver.probe = vpn_probe;
 670         data->provider_driver.remove = vpn_remove;
 671         data->provider_driver.save = vpn_save;
 672
 673         if (!driver_hash)
 674                 driver_hash = g_hash_table_new_full(g_str_hash,
 675                                                         g_str_equal,
 676                                                         NULL, g_free);
 677
 678         if (!driver_hash) {
 679                 connman_error("driver_hash not initialized for %s", name);
 680                 g_free(data);
 681                 return -ENOMEM;
 682         }
 683
 684         g_hash_table_replace(driver_hash, (char *)name, data);
 685
 686         vpn_provider_driver_register(&data->provider_driver);
 687
 688         return 0;
 689 }
 690
 691 void vpn_unregister(const char *name)
 692 {
 693         struct vpn_driver_data *data;
 694
 695         data = g_hash_table_lookup(driver_hash, name);
 696         if (!data)
 697                 return;
 698
 699         vpn_provider_driver_unregister(&data->provider_driver);
 700
 701         g_hash_table_remove(driver_hash, name);
 702
 703         if (g_hash_table_size(driver_hash) == 0)
 704                 g_hash_table_destroy(driver_hash);
 705 }