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         int tun_flags;
  60 };
  61
  62 struct vpn_driver_data {
  63         const char *name;
  64         const char *program;
  65         struct vpn_driver *vpn_driver;
  66         struct vpn_provider_driver provider_driver;
  67 };
  68
  69 GHashTable *driver_hash = NULL;
  70
  71 static int stop_vpn(struct vpn_provider *provider)
  72 {
  73         struct vpn_data *data = vpn_provider_get_data(provider);
  74         struct vpn_driver_data *vpn_driver_data;
  75         const char *name;
  76         struct ifreq ifr;
  77         int fd, err;
  78
  79         if (!data)
  80                 return -EINVAL;
  81
  82         name = vpn_provider_get_driver_name(provider);
  83         if (!name)
  84                 return -EINVAL;
  85
  86         vpn_driver_data = g_hash_table_lookup(driver_hash, name);
  87
  88         if (vpn_driver_data && vpn_driver_data->vpn_driver &&
  89                         vpn_driver_data->vpn_driver->flags == VPN_FLAG_NO_TUN)
  90                 return 0;
  91
  92         memset(&ifr, 0, sizeof(ifr));
  93         ifr.ifr_flags = data->tun_flags | IFF_NO_PI;
  94         sprintf(ifr.ifr_name, "%s", data->if_name);
  95
  96         fd = open("/dev/net/tun", O_RDWR | O_CLOEXEC);
  97         if (fd < 0) {
  98                 err = -errno;
  99                 connman_error("Failed to open /dev/net/tun to device %s: %s",
 100                               data->if_name, strerror(errno));
 101                 return err;
 102         }
 103
 104         if (ioctl(fd, TUNSETIFF, (void *)&ifr)) {
 105                 err = -errno;
 106                 connman_error("Failed to TUNSETIFF for device %s to it: %s",
 107                               data->if_name, strerror(errno));
 108                 close(fd);
 109                 return err;
 110         }
 111
 112         if (ioctl(fd, TUNSETPERSIST, 0)) {
 113                 err = -errno;
 114                 connman_error("Failed to set tun device %s nonpersistent: %s",
 115                               data->if_name, strerror(errno));
 116                 close(fd);
 117                 return err;
 118         }
 119         close(fd);
 120         DBG("Killed tun device %s", data->if_name);
 121         return 0;
 122 }
 123
 124 void vpn_died(struct connman_task *task, int exit_code, void *user_data)
 125 {
 126         struct vpn_provider *provider = user_data;
 127         struct vpn_data *data = vpn_provider_get_data(provider);
 128         int state = VPN_STATE_FAILURE;
 129         enum vpn_provider_error ret;
 130
 131         DBG("provider %p data %p", provider, data);
 132
 133         if (!data)
 134                 goto vpn_exit;
 135
 136         state = data->state;
 137
 138         stop_vpn(provider);
 139         vpn_provider_set_data(provider, NULL);
 140
 141         if (data->watch != 0) {
 142                 vpn_rtnl_remove_watch(data->watch);
 143                 data->watch = 0;
 144                 vpn_provider_unref(provider);
 145         }
 146
 147 vpn_exit:
 148         if (state != VPN_STATE_READY && state != VPN_STATE_DISCONNECT) {
 149                 const char *name;
 150                 struct vpn_driver_data *vpn_data = NULL;
 151
 152                 name = vpn_provider_get_driver_name(provider);
 153                 if (name)
 154                         vpn_data = g_hash_table_lookup(driver_hash, name);
 155
 156                 if (vpn_data &&
 157                                 vpn_data->vpn_driver->error_code)
 158                         ret = vpn_data->vpn_driver->error_code(provider,
 159                                         exit_code);
 160                 else
 161                         ret = VPN_PROVIDER_ERROR_UNKNOWN;
 162
 163                 vpn_provider_indicate_error(provider, ret);
 164         } else
 165                 vpn_provider_set_state(provider, VPN_PROVIDER_STATE_IDLE);
 166
 167         vpn_provider_set_index(provider, -1);
 168
 169         if (data) {
 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 || !data)
 184                 return  -EIO;
 185
 186         index = connman_inet_ifindex(ifname);
 187         if (index < 0)
 188                 return  -EIO;
 189
 190         if (data->if_name)
 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 int vpn_set_state(struct vpn_provider *provider,
 200                                                 enum vpn_provider_state state)
 201 {
 202         struct vpn_data *data = vpn_provider_get_data(provider);
 203         if (!data)
 204                 return -EINVAL;
 205
 206         switch (state) {
 207         case VPN_PROVIDER_STATE_UNKNOWN:
 208                 return -EINVAL;
 209         case VPN_PROVIDER_STATE_IDLE:
 210                 data->state = VPN_STATE_IDLE;
 211                 break;
 212         case VPN_PROVIDER_STATE_CONNECT:
 213         case VPN_PROVIDER_STATE_READY:
 214                 data->state = VPN_STATE_CONNECT;
 215                 break;
 216         case VPN_PROVIDER_STATE_DISCONNECT:
 217                 data->state = VPN_STATE_DISCONNECT;
 218                 break;
 219         case VPN_PROVIDER_STATE_FAILURE:
 220                 data->state = VPN_STATE_FAILURE;
 221                 break;
 222         }
 223
 224         return 0;
 225 }
 226
 227 static void vpn_newlink(unsigned flags, unsigned change, void *user_data)
 228 {
 229         struct vpn_provider *provider = user_data;
 230         struct vpn_data *data = vpn_provider_get_data(provider);
 231
 232         if ((data->flags & IFF_UP) != (flags & IFF_UP)) {
 233                 if (flags & IFF_UP) {
 234                         data->state = VPN_STATE_READY;
 235                         vpn_provider_set_state(provider,
 236                                         VPN_PROVIDER_STATE_READY);
 237                 }
 238         }
 239         data->flags = flags;
 240 }
 241
 242 static DBusMessage *vpn_notify(struct connman_task *task,
 243                         DBusMessage *msg, void *user_data)
 244 {
 245         struct vpn_provider *provider = user_data;
 246         struct vpn_data *data;
 247         struct vpn_driver_data *vpn_driver_data;
 248         const char *name;
 249         int state, index, err;
 250
 251         data = vpn_provider_get_data(provider);
 252
 253         name = vpn_provider_get_driver_name(provider);
 254
 255         if (!name) {
 256                 DBG("Cannot find VPN driver for provider %p", provider);
 257                 vpn_provider_set_state(provider, VPN_PROVIDER_STATE_FAILURE);
 258                 return NULL;
 259         }
 260
 261         vpn_driver_data = g_hash_table_lookup(driver_hash, name);
 262         if (!vpn_driver_data) {
 263                 DBG("Cannot find VPN driver data for name %s", name);
 264                 vpn_provider_set_state(provider, VPN_PROVIDER_STATE_FAILURE);
 265                 return NULL;
 266         }
 267
 268         state = vpn_driver_data->vpn_driver->notify(msg, provider);
 269
 270         DBG("provider %p driver %s state %d", provider, name, state);
 271
 272         switch (state) {
 273         case VPN_STATE_CONNECT:
 274         case VPN_STATE_READY:
 275                 if (data->state == VPN_STATE_READY) {
 276                         /*
 277                          * This is the restart case, in which case we must
 278                          * just set the IP address.
 279                          *
 280                          * We need to remove first the old address, just
 281                          * replacing the old address will not work as expected
 282                          * because the old address will linger in the interface
 283                          * and not disapper so the clearing is needed here.
 284                          *
 285                          * Also the state must change, otherwise the routes
 286                          * will not be set properly.
 287                          */
 288                         vpn_provider_set_state(provider,
 289                                                 VPN_PROVIDER_STATE_CONNECT);
 290
 291                         vpn_provider_clear_address(provider, AF_INET);
 292                         vpn_provider_clear_address(provider, AF_INET6);
 293
 294                         vpn_provider_change_address(provider);
 295                         vpn_provider_set_state(provider,
 296                                                 VPN_PROVIDER_STATE_READY);
 297                         break;
 298                 }
 299
 300                 index = vpn_provider_get_index(provider);
 301                 vpn_provider_ref(provider);
 302                 data->watch = vpn_rtnl_add_newlink_watch(index,
 303                                                      vpn_newlink, provider);
 304                 err = connman_inet_ifup(index);
 305                 if (err < 0) {
 306                         if (err == -EALREADY)
 307                                 /*
 308                                  * So the interface is up already, that is just
 309                                  * great. Unfortunately in this case the
 310                                  * newlink watch might not have been called at
 311                                  * all. We must manually call it here so that
 312                                  * the provider can go to ready state and the
 313                                  * routes are setup properly.
 314                                  */
 315                                 vpn_newlink(IFF_UP, 0, provider);
 316                         else
 317                                 DBG("Cannot take interface %d up err %d/%s",
 318                                         index, -err, strerror(-err));
 319                 }
 320                 break;
 321
 322         case VPN_STATE_UNKNOWN:
 323         case VPN_STATE_IDLE:
 324         case VPN_STATE_DISCONNECT:
 325         case VPN_STATE_FAILURE:
 326                 vpn_provider_set_state(provider,
 327                                         VPN_PROVIDER_STATE_DISCONNECT);
 328                 break;
 329
 330         case VPN_STATE_AUTH_FAILURE:
 331                 vpn_provider_indicate_error(provider,
 332                                         VPN_PROVIDER_ERROR_AUTH_FAILED);
 333                 break;
 334         }
 335
 336         return NULL;
 337 }
 338
 339 static int vpn_create_tun(struct vpn_provider *provider, int flags)
 340 {
 341         struct vpn_data *data = vpn_provider_get_data(provider);
 342         struct ifreq ifr;
 343         int i, fd, index;
 344         int ret = 0;
 345
 346         if (!data)
 347                 return -EISCONN;
 348
 349         fd = open("/dev/net/tun", O_RDWR | O_CLOEXEC);
 350         if (fd < 0) {
 351                 i = -errno;
 352                 connman_error("Failed to open /dev/net/tun: %s",
 353                               strerror(errno));
 354                 ret = i;
 355                 goto exist_err;
 356         }
 357
 358         memset(&ifr, 0, sizeof(ifr));
 359         ifr.ifr_flags = flags | IFF_NO_PI;
 360
 361         for (i = 0; i < 256; i++) {
 362                 sprintf(ifr.ifr_name, "vpn%d", i);
 363
 364                 if (!ioctl(fd, TUNSETIFF, (void *)&ifr))
 365                         break;
 366         }
 367
 368         if (i == 256) {
 369                 connman_error("Failed to find available tun device");
 370                 close(fd);
 371                 ret = -ENODEV;
 372                 goto exist_err;
 373         }
 374
 375         data->tun_flags = flags;
 376         data->if_name = (char *)g_strdup(ifr.ifr_name);
 377         if (!data->if_name) {
 378                 connman_error("Failed to allocate memory");
 379                 close(fd);
 380                 ret = -ENOMEM;
 381                 goto exist_err;
 382         }
 383
 384         if (ioctl(fd, TUNSETPERSIST, 1)) {
 385                 i = -errno;
 386                 connman_error("Failed to set tun persistent: %s",
 387                               strerror(errno));
 388                 close(fd);
 389                 ret = i;
 390                 goto exist_err;
 391         }
 392
 393         close(fd);
 394
 395         index = connman_inet_ifindex(data->if_name);
 396         if (index < 0) {
 397                 connman_error("Failed to get tun ifindex");
 398                 stop_vpn(provider);
 399                 ret = -EIO;
 400                 goto exist_err;
 401         }
 402         vpn_provider_set_index(provider, index);
 403
 404         return 0;
 405
 406 exist_err:
 407         return ret;
 408 }
 409
 410 static int vpn_connect(struct vpn_provider *provider,
 411                         vpn_provider_connect_cb_t cb,
 412                         const char *dbus_sender, void *user_data)
 413 {
 414         struct vpn_data *data = vpn_provider_get_data(provider);
 415         struct vpn_driver_data *vpn_driver_data;
 416         const char *name;
 417         int ret = 0, tun_flags = IFF_TUN;
 418         enum vpn_state state = VPN_STATE_UNKNOWN;
 419
 420         if (data)
 421                 state = data->state;
 422
 423         DBG("data %p state %d", data, state);
 424
 425         switch (state) {
 426         case VPN_STATE_UNKNOWN:
 427                 data = g_try_new0(struct vpn_data, 1);
 428                 if (!data)
 429                         return -ENOMEM;
 430
 431                 data->provider = vpn_provider_ref(provider);
 432                 data->watch = 0;
 433                 data->flags = 0;
 434                 data->task = NULL;
 435
 436                 vpn_provider_set_data(provider, data);
 437                 /* fall through */
 438
 439         case VPN_STATE_DISCONNECT:
 440         case VPN_STATE_IDLE:
 441         case VPN_STATE_FAILURE:
 442         case VPN_STATE_AUTH_FAILURE:
 443                 data->state = VPN_STATE_IDLE;
 444                 break;
 445
 446         case VPN_STATE_CONNECT:
 447                 return -EINPROGRESS;
 448
 449         case VPN_STATE_READY:
 450                 return -EISCONN;
 451         }
 452
 453         name = vpn_provider_get_driver_name(provider);
 454         if (!name)
 455                 return -EINVAL;
 456
 457         vpn_driver_data = g_hash_table_lookup(driver_hash, name);
 458
 459         if (!vpn_driver_data || !vpn_driver_data->vpn_driver) {
 460                 ret = -EINVAL;
 461                 goto exist_err;
 462         }
 463
 464         if (vpn_driver_data->vpn_driver->flags != VPN_FLAG_NO_TUN) {
 465                 if (vpn_driver_data->vpn_driver->device_flags) {
 466                         tun_flags = vpn_driver_data->vpn_driver->device_flags(provider);
 467                 }
 468                 ret = vpn_create_tun(provider, tun_flags);
 469                 if (ret < 0)
 470                         goto exist_err;
 471         }
 472
 473         data->task = connman_task_create(vpn_driver_data->program);
 474
 475         if (!data->task) {
 476                 ret = -ENOMEM;
 477                 stop_vpn(provider);
 478                 goto exist_err;
 479         }
 480
 481         if (connman_task_set_notify(data->task, "notify",
 482                                         vpn_notify, provider)) {
 483                 ret = -ENOMEM;
 484                 stop_vpn(provider);
 485                 connman_task_destroy(data->task);
 486                 data->task = NULL;
 487                 goto exist_err;
 488         }
 489
 490         ret = vpn_driver_data->vpn_driver->connect(provider, data->task,
 491                                                 data->if_name, cb, dbus_sender,
 492                                                 user_data);
 493         if (ret < 0 && ret != -EINPROGRESS) {
 494                 stop_vpn(provider);
 495                 connman_task_destroy(data->task);
 496                 data->task = NULL;
 497                 goto exist_err;
 498         }
 499
 500         DBG("%s started with dev %s",
 501                 vpn_driver_data->provider_driver.name, data->if_name);
 502
 503         data->state = VPN_STATE_CONNECT;
 504
 505         return -EINPROGRESS;
 506
 507 exist_err:
 508         vpn_provider_set_index(provider, -1);
 509         vpn_provider_set_data(provider, NULL);
 510         vpn_provider_unref(data->provider);
 511         g_free(data->if_name);
 512         g_free(data);
 513
 514         return ret;
 515 }
 516
 517 static int vpn_probe(struct vpn_provider *provider)
 518 {
 519         return 0;
 520 }
 521
 522 static int vpn_disconnect(struct vpn_provider *provider)
 523 {
 524         struct vpn_data *data = vpn_provider_get_data(provider);
 525         struct vpn_driver_data *vpn_driver_data;
 526         const char *name;
 527
 528         DBG("disconnect provider %p:", provider);
 529
 530         if (!data)
 531                 return 0;
 532
 533         name = vpn_provider_get_driver_name(provider);
 534         if (!name)
 535                 return 0;
 536
 537         vpn_driver_data = g_hash_table_lookup(driver_hash, name);
 538         if (vpn_driver_data->vpn_driver->disconnect)
 539                 vpn_driver_data->vpn_driver->disconnect(provider);
 540
 541         if (data->watch != 0) {
 542                 vpn_provider_unref(provider);
 543                 vpn_rtnl_remove_watch(data->watch);
 544                 data->watch = 0;
 545         }
 546
 547         data->state = VPN_STATE_DISCONNECT;
 548         connman_task_stop(data->task);
 549
 550         return 0;
 551 }
 552
 553 static int vpn_remove(struct vpn_provider *provider)
 554 {
 555         struct vpn_data *data;
 556
 557         data = vpn_provider_get_data(provider);
 558         if (!data)
 559                 return 0;
 560
 561         if (data->watch != 0) {
 562                 vpn_provider_unref(provider);
 563                 vpn_rtnl_remove_watch(data->watch);
 564                 data->watch = 0;
 565         }
 566
 567         connman_task_stop(data->task);
 568
 569         g_usleep(G_USEC_PER_SEC);
 570         stop_vpn(provider);
 571         return 0;
 572 }
 573
 574 static int vpn_save(struct vpn_provider *provider, GKeyFile *keyfile)
 575 {
 576         struct vpn_driver_data *vpn_driver_data;
 577         const char *name;
 578
 579         name = vpn_provider_get_driver_name(provider);
 580         vpn_driver_data = g_hash_table_lookup(driver_hash, name);
 581         if (vpn_driver_data &&
 582                         vpn_driver_data->vpn_driver->save)
 583                 return vpn_driver_data->vpn_driver->save(provider, keyfile);
 584
 585         return 0;
 586 }
 587
 588 int vpn_register(const char *name, struct vpn_driver *vpn_driver,
 589                         const char *program)
 590 {
 591         struct vpn_driver_data *data;
 592
 593         data = g_try_new0(struct vpn_driver_data, 1);
 594         if (!data)
 595                 return -ENOMEM;
 596
 597         data->name = name;
 598         data->program = program;
 599
 600         data->vpn_driver = vpn_driver;
 601
 602         data->provider_driver.name = name;
 603         data->provider_driver.disconnect = vpn_disconnect;
 604         data->provider_driver.connect = vpn_connect;
 605         data->provider_driver.probe = vpn_probe;
 606         data->provider_driver.remove = vpn_remove;
 607         data->provider_driver.save = vpn_save;
 608         data->provider_driver.set_state = vpn_set_state;
 609
 610         if (!driver_hash)
 611                 driver_hash = g_hash_table_new_full(g_str_hash,
 612                                                         g_str_equal,
 613                                                         NULL, g_free);
 614
 615         if (!driver_hash) {
 616                 connman_error("driver_hash not initialized for %s", name);
 617                 g_free(data);
 618                 return -ENOMEM;
 619         }
 620
 621         g_hash_table_replace(driver_hash, (char *)name, data);
 622
 623         vpn_provider_driver_register(&data->provider_driver);
 624
 625         return 0;
 626 }
 627
 628 void vpn_unregister(const char *name)
 629 {
 630         struct vpn_driver_data *data;
 631
 632         data = g_hash_table_lookup(driver_hash, name);
 633         if (!data)
 634                 return;
 635
 636         vpn_provider_driver_unregister(&data->provider_driver);
 637
 638         g_hash_table_remove(driver_hash, name);
 639
 640         if (g_hash_table_size(driver_hash) == 0)
 641                 g_hash_table_destroy(driver_hash);
 642 }