vpn/plugins/l2tp.c

   1 /*
   2  *
   3  *  ConnMan VPN daemon
   4  *
   5  *  Copyright (C) 2010,2013  BMW Car IT GmbH.
   6  *  Copyright (C) 2012-2013  Intel Corporation. All rights reserved.
   7  *
   8  *  This program is free software; you can redistribute it and/or modify
   9  *  it under the terms of the GNU General Public License version 2 as
  10  *  published by the Free Software Foundation.
  11  *
  12  *  This program is distributed in the hope that it will be useful,
  13  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  *  GNU General Public License for more details.
  16  *
  17  *  You should have received a copy of the GNU General Public License
  18  *  along with this program; if not, write to the Free Software
  19  *  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  20  *
  21  */
  22
  23 #ifdef HAVE_CONFIG_H
  24 #include <config.h>
  25 #endif
  26
  27 #include <string.h>
  28 #include <errno.h>
  29 #include <unistd.h>
  30 #include <sys/types.h>
  31 #include <sys/stat.h>
  32 #include <fcntl.h>
  33
  34 #include <stdio.h>
  35 #include <net/if.h>
  36
  37 #include <dbus/dbus.h>
  38 #include <glib.h>
  39
  40 #define CONNMAN_API_SUBJECT_TO_CHANGE
  41 #include <connman/plugin.h>
  42 #include <connman/provider.h>
  43 #include <connman/log.h>
  44 #include <connman/task.h>
  45 #include <connman/dbus.h>
  46 #include <connman/inet.h>
  47 #include <connman/agent.h>
  48 #include <connman/setting.h>
  49 #include <connman/vpn-dbus.h>
  50
  51 #include "../vpn-provider.h"
  52 #include "../vpn-agent.h"
  53
  54 #include "vpn.h"
  55
  56 #define ARRAY_SIZE(a) (sizeof(a)/sizeof(a[0]))
  57
  58 enum {
  59         OPT_STRING = 1,
  60         OPT_BOOL = 2,
  61 };
  62
  63 enum {
  64         OPT_ALL = 1,
  65         OPT_L2G = 2,
  66         OPT_L2  = 3,
  67         OPT_PPPD = 4,
  68         OPT_L2LNS = 5,
  69 };
  70
  71 struct {
  72         const char *cm_opt;
  73         const char *pppd_opt;
  74         int sub;
  75         const char *vpn_default;
  76         int type;
  77 } pppd_options[] = {
  78         { "L2TP.User", "name", OPT_ALL, NULL, OPT_STRING },
  79         { "L2TP.BPS", "bps", OPT_L2, NULL, OPT_STRING },
  80         { "L2TP.TXBPS", "tx bps", OPT_L2, NULL, OPT_STRING },
  81         { "L2TP.RXBPS", "rx bps", OPT_L2, NULL, OPT_STRING },
  82         { "L2TP.LengthBit", "length bit", OPT_L2, NULL, OPT_STRING },
  83         { "L2TP.Challenge", "challenge", OPT_L2, NULL, OPT_STRING },
  84         { "L2TP.DefaultRoute", "defaultroute", OPT_L2, NULL, OPT_STRING },
  85         { "L2TP.FlowBit", "flow bit", OPT_L2, NULL, OPT_STRING },
  86         { "L2TP.TunnelRWS", "tunnel rws", OPT_L2, NULL, OPT_STRING },
  87         { "L2TP.Exclusive", "exclusive", OPT_L2LNS, NULL, OPT_STRING },
  88         { "L2TP.Autodial", "autodial", OPT_L2, "yes", OPT_STRING },
  89         { "L2TP.Redial", "redial", OPT_L2, "yes", OPT_STRING },
  90         { "L2TP.RedialTimeout", "redial timeout", OPT_L2, "10", OPT_STRING },
  91         { "L2TP.MaxRedials", "max redials", OPT_L2, NULL, OPT_STRING },
  92         { "L2TP.RequirePAP", "require pap", OPT_L2, "no", OPT_STRING },
  93         { "L2TP.RequireCHAP", "require chap", OPT_L2, "yes", OPT_STRING },
  94         { "L2TP.ReqAuth", "require authentication", OPT_L2, "no", OPT_STRING },
  95         { "L2TP.AccessControl", "access control", OPT_L2G, "yes", OPT_STRING },
  96         { "L2TP.AuthFile", "auth file", OPT_L2G, NULL, OPT_STRING },
  97         { "L2TP.ForceUserSpace", "force userspace", OPT_L2G, NULL, OPT_STRING },
  98         { "L2TP.ListenAddr", "listen-addr", OPT_L2G, NULL, OPT_STRING },
  99         { "L2TP.Rand Source", "rand source", OPT_L2G, NULL, OPT_STRING },
 100         { "L2TP.IPsecSaref", "ipsec saref", OPT_L2G, "no", OPT_STRING },
 101         { "L2TP.Port", "port", OPT_L2G, NULL, OPT_STRING },
 102         { "PPPD.EchoFailure", "lcp-echo-failure", OPT_PPPD, "0", OPT_STRING },
 103         { "PPPD.EchoInterval", "lcp-echo-interval", OPT_PPPD, "0", OPT_STRING },
 104         { "PPPD.Debug", "debug", OPT_PPPD, NULL, OPT_STRING },
 105         { "PPPD.RefuseEAP", "refuse-eap", OPT_PPPD, NULL, OPT_BOOL },
 106         { "PPPD.RefusePAP", "refuse-pap", OPT_PPPD, NULL, OPT_BOOL },
 107         { "PPPD.RefuseCHAP", "refuse-chap", OPT_PPPD, NULL, OPT_BOOL },
 108         { "PPPD.RefuseMSCHAP", "refuse-mschap", OPT_PPPD, NULL, OPT_BOOL },
 109         { "PPPD.RefuseMSCHAP2", "refuse-mschapv2", OPT_PPPD, NULL, OPT_BOOL },
 110         { "PPPD.NoBSDComp", "nobsdcomp", OPT_PPPD, NULL, OPT_BOOL },
 111         { "PPPD.NoPcomp", "nopcomp", OPT_PPPD, NULL, OPT_BOOL },
 112         { "PPPD.UseAccomp", "noaccomp", OPT_PPPD, NULL, OPT_BOOL },
 113         { "PPPD.NoDeflate", "nodeflate", OPT_PPPD, NULL, OPT_BOOL },
 114         { "PPPD.ReqMPPE", "require-mppe", OPT_PPPD, NULL, OPT_BOOL },
 115         { "PPPD.ReqMPPE40", "require-mppe-40", OPT_PPPD, NULL, OPT_BOOL },
 116         { "PPPD.ReqMPPE128", "require-mppe-128", OPT_PPPD, NULL, OPT_BOOL },
 117         { "PPPD.ReqMPPEStateful", "mppe-stateful", OPT_PPPD, NULL, OPT_BOOL },
 118         { "PPPD.NoVJ", "novj", OPT_PPPD, NULL, OPT_BOOL },
 119 };
 120
 121 static DBusConnection *connection;
 122
 123 struct l2tp_private_data {
 124         struct connman_task *task;
 125         char *if_name;
 126         vpn_provider_connect_cb_t cb;
 127         void *user_data;
 128 };
 129
 130 static DBusMessage *l2tp_get_sec(struct connman_task *task,
 131                         DBusMessage *msg, void *user_data)
 132 {
 133         const char *user, *passwd;
 134         struct vpn_provider *provider = user_data;
 135
 136         if (!dbus_message_get_no_reply(msg)) {
 137                 DBusMessage *reply;
 138
 139                 user = vpn_provider_get_string(provider, "L2TP.User");
 140                 passwd = vpn_provider_get_string(provider, "L2TP.Password");
 141
 142                 if (!user || strlen(user) == 0 ||
 143                                 !passwd || strlen(passwd) == 0)
 144                         return NULL;
 145
 146                 reply = dbus_message_new_method_return(msg);
 147                 if (!reply)
 148                         return NULL;
 149
 150                 dbus_message_append_args(reply, DBUS_TYPE_STRING, &user,
 151                                                 DBUS_TYPE_STRING, &passwd,
 152                                                 DBUS_TYPE_INVALID);
 153
 154                 return reply;
 155         }
 156
 157         return NULL;
 158 }
 159
 160 static int l2tp_notify(DBusMessage *msg, struct vpn_provider *provider)
 161 {
 162         DBusMessageIter iter, dict;
 163         const char *reason, *key, *value;
 164         char *addressv4 = NULL, *netmask = NULL, *gateway = NULL;
 165         char *ifname = NULL, *nameservers = NULL;
 166         struct connman_ipaddress *ipaddress = NULL;
 167
 168         dbus_message_iter_init(msg, &iter);
 169
 170         dbus_message_iter_get_basic(&iter, &reason);
 171         dbus_message_iter_next(&iter);
 172
 173         if (!provider) {
 174                 connman_error("No provider found");
 175                 return VPN_STATE_FAILURE;
 176         }
 177
 178         if (strcmp(reason, "auth failed") == 0) {
 179                 DBG("authentication failure");
 180
 181                 vpn_provider_set_string(provider, "L2TP.User", NULL);
 182                 vpn_provider_set_string_hide_value(provider, "L2TP.Password",
 183                                         NULL);
 184
 185                 return VPN_STATE_AUTH_FAILURE;
 186         }
 187
 188         if (strcmp(reason, "connect"))
 189                 return VPN_STATE_DISCONNECT;
 190
 191         dbus_message_iter_recurse(&iter, &dict);
 192
 193         while (dbus_message_iter_get_arg_type(&dict) == DBUS_TYPE_DICT_ENTRY) {
 194                 DBusMessageIter entry;
 195
 196                 dbus_message_iter_recurse(&dict, &entry);
 197                 dbus_message_iter_get_basic(&entry, &key);
 198                 dbus_message_iter_next(&entry);
 199                 dbus_message_iter_get_basic(&entry, &value);
 200
 201                 DBG("%s = %s", key, value);
 202
 203                 if (!strcmp(key, "INTERNAL_IP4_ADDRESS"))
 204                         addressv4 = g_strdup(value);
 205
 206                 if (!strcmp(key, "INTERNAL_IP4_NETMASK"))
 207                         netmask = g_strdup(value);
 208
 209                 if (!strcmp(key, "INTERNAL_IP4_DNS"))
 210                         nameservers = g_strdup(value);
 211
 212                 if (!strcmp(key, "INTERNAL_IFNAME"))
 213                         ifname = g_strdup(value);
 214
 215                 dbus_message_iter_next(&dict);
 216         }
 217
 218         if (vpn_set_ifname(provider, ifname) < 0) {
 219                 g_free(ifname);
 220                 g_free(addressv4);
 221                 g_free(netmask);
 222                 g_free(nameservers);
 223                 return VPN_STATE_FAILURE;
 224         }
 225
 226         if (addressv4)
 227                 ipaddress = connman_ipaddress_alloc(AF_INET);
 228
 229         g_free(ifname);
 230
 231         if (!ipaddress) {
 232                 connman_error("No IP address for provider");
 233                 g_free(addressv4);
 234                 g_free(netmask);
 235                 g_free(nameservers);
 236                 return VPN_STATE_FAILURE;
 237         }
 238
 239         value = vpn_provider_get_string(provider, "HostIP");
 240         if (value) {
 241                 vpn_provider_set_string(provider, "Gateway", value);
 242                 gateway = g_strdup(value);
 243         }
 244
 245         if (addressv4)
 246                 connman_ipaddress_set_ipv4(ipaddress, addressv4, netmask,
 247                                         gateway);
 248
 249         connman_ipaddress_set_p2p(ipaddress, true);
 250
 251         vpn_provider_set_ipaddress(provider, ipaddress);
 252         vpn_provider_set_nameservers(provider, nameservers);
 253
 254         g_free(addressv4);
 255         g_free(netmask);
 256         g_free(gateway);
 257         g_free(nameservers);
 258         connman_ipaddress_free(ipaddress);
 259
 260         return VPN_STATE_CONNECT;
 261 }
 262
 263 static int l2tp_save(struct vpn_provider *provider, GKeyFile *keyfile)
 264 {
 265         const char *option;
 266         bool l2tp_option, pppd_option;
 267         int i;
 268
 269         for (i = 0; i < (int)ARRAY_SIZE(pppd_options); i++) {
 270                 l2tp_option = pppd_option = false;
 271
 272                 if (strncmp(pppd_options[i].cm_opt, "L2TP.", 5) == 0)
 273                         l2tp_option = true;
 274
 275                 if (strncmp(pppd_options[i].cm_opt, "PPPD.", 5) == 0)
 276                         pppd_option = true;
 277
 278                 if (l2tp_option || pppd_option) {
 279                         option = vpn_provider_get_string(provider,
 280                                                 pppd_options[i].cm_opt);
 281                         if (!option) {
 282                                 /*
 283                                  * Check if the option prefix is L2TP as the
 284                                  * PPPD options were using L2TP prefix earlier.
 285                                  */
 286                                 char *l2tp_str;
 287
 288                                 if (!pppd_option)
 289                                         continue;
 290
 291                                 l2tp_str = g_strdup_printf("L2TP.%s",
 292                                                 &pppd_options[i].cm_opt[5]);
 293                                 option = vpn_provider_get_string(provider,
 294                                                                 l2tp_str);
 295                                 g_free(l2tp_str);
 296
 297                                 if (!option)
 298                                         continue;
 299                         }
 300
 301                         g_key_file_set_string(keyfile,
 302                                         vpn_provider_get_save_group(provider),
 303                                         pppd_options[i].cm_opt, option);
 304                 }
 305         }
 306
 307         return 0;
 308 }
 309
 310 static ssize_t full_write(int fd, const void *buf, size_t len)
 311 {
 312         ssize_t byte_write;
 313
 314         while (len) {
 315                 byte_write = write(fd, buf, len);
 316                 if (byte_write < 0) {
 317                         connman_error("failed to write config to l2tp: %s\n",
 318                                         strerror(errno));
 319                         return byte_write;
 320                 }
 321                 len -= byte_write;
 322                 buf += byte_write;
 323         }
 324
 325         return 0;
 326 }
 327
 328 static ssize_t l2tp_write_bool_option(int fd,
 329                                         const char *key, const char *value)
 330 {
 331         gchar *buf;
 332         ssize_t ret = 0;
 333
 334         if (key && value) {
 335                 if (strcasecmp(value, "yes") == 0 ||
 336                                 strcasecmp(value, "true") == 0 ||
 337                                 strcmp(value, "1") == 0) {
 338                         buf = g_strdup_printf("%s\n", key);
 339                         ret = full_write(fd, buf, strlen(buf));
 340
 341                         g_free(buf);
 342                 }
 343         }
 344
 345         return ret;
 346 }
 347
 348 static int l2tp_write_option(int fd, const char *key, const char *value)
 349 {
 350         gchar *buf;
 351         ssize_t ret = 0;
 352
 353         if (key) {
 354                 if (value)
 355                         buf = g_strdup_printf("%s %s\n", key, value);
 356                 else
 357                         buf = g_strdup_printf("%s\n", key);
 358
 359                 ret = full_write(fd, buf, strlen(buf));
 360
 361                 g_free(buf);
 362         }
 363
 364         return ret;
 365 }
 366
 367 static int l2tp_write_section(int fd, const char *key, const char *value)
 368 {
 369         gchar *buf;
 370         ssize_t ret = 0;
 371
 372         if (key && value) {
 373                 buf = g_strdup_printf("%s = %s\n", key, value);
 374                 ret = full_write(fd, buf, strlen(buf));
 375
 376                 g_free(buf);
 377         }
 378
 379         return ret;
 380 }
 381
 382 static int write_pppd_option(struct vpn_provider *provider, int fd)
 383 {
 384         int i;
 385         const char *opt_s;
 386
 387         l2tp_write_option(fd, "nodetach", NULL);
 388         l2tp_write_option(fd, "lock", NULL);
 389         l2tp_write_option(fd, "logfd", "2");
 390         l2tp_write_option(fd, "usepeerdns", NULL);
 391         l2tp_write_option(fd, "noipdefault", NULL);
 392         l2tp_write_option(fd, "noauth", NULL);
 393         l2tp_write_option(fd, "nodefaultroute", NULL);
 394         l2tp_write_option(fd, "ipparam", "l2tp_plugin");
 395
 396         for (i = 0; i < (int)ARRAY_SIZE(pppd_options); i++) {
 397                 if (pppd_options[i].sub != OPT_ALL &&
 398                         pppd_options[i].sub != OPT_PPPD)
 399                         continue;
 400
 401                 opt_s = vpn_provider_get_string(provider,
 402                                         pppd_options[i].cm_opt);
 403                 if (!opt_s)
 404                         opt_s = pppd_options[i].vpn_default;
 405
 406                 if (!opt_s)
 407                         continue;
 408
 409                 if (pppd_options[i].type == OPT_STRING)
 410                         l2tp_write_option(fd,
 411                                 pppd_options[i].pppd_opt, opt_s);
 412                 else if (pppd_options[i].type == OPT_BOOL)
 413                         l2tp_write_bool_option(fd,
 414                                 pppd_options[i].pppd_opt, opt_s);
 415         }
 416
 417         l2tp_write_option(fd, "plugin",
 418                                 SCRIPTDIR "/libppp-plugin.so");
 419
 420         return 0;
 421 }
 422
 423
 424 static int l2tp_write_fields(struct vpn_provider *provider,
 425                                                 int fd, int sub)
 426 {
 427         int i;
 428         const char *opt_s;
 429
 430         for (i = 0; i < (int)ARRAY_SIZE(pppd_options); i++) {
 431                 if (pppd_options[i].sub != sub)
 432                         continue;
 433
 434                 opt_s = vpn_provider_get_string(provider,
 435                                         pppd_options[i].cm_opt);
 436                 if (!opt_s)
 437                         opt_s = pppd_options[i].vpn_default;
 438
 439                 if (!opt_s)
 440                         continue;
 441
 442                 if (pppd_options[i].type == OPT_STRING)
 443                         l2tp_write_section(fd,
 444                                 pppd_options[i].pppd_opt, opt_s);
 445                 else if (pppd_options[i].type == OPT_BOOL)
 446                         l2tp_write_bool_option(fd,
 447                                 pppd_options[i].pppd_opt, opt_s);
 448         }
 449
 450         return 0;
 451 }
 452
 453 static int l2tp_write_config(struct vpn_provider *provider,
 454                                         const char *pppd_name, int fd)
 455 {
 456         const char *option;
 457
 458         l2tp_write_option(fd, "[global]", NULL);
 459         l2tp_write_fields(provider, fd, OPT_L2G);
 460
 461         l2tp_write_option(fd, "[lns default]", NULL);
 462         l2tp_write_fields(provider, fd, OPT_L2LNS);
 463
 464         l2tp_write_option(fd, "[lac l2tp]", NULL);
 465
 466         option = vpn_provider_get_string(provider, "Host");
 467         l2tp_write_option(fd, "lns =", option);
 468
 469         l2tp_write_fields(provider, fd, OPT_ALL);
 470         l2tp_write_fields(provider, fd, OPT_L2);
 471
 472         l2tp_write_option(fd, "pppoptfile =", pppd_name);
 473
 474         return 0;
 475 }
 476
 477 static void l2tp_died(struct connman_task *task, int exit_code, void *user_data)
 478 {
 479         char *conf_file;
 480
 481         vpn_died(task, exit_code, user_data);
 482
 483         conf_file = g_strdup_printf(VPN_STATEDIR "/connman-xl2tpd.conf");
 484         unlink(conf_file);
 485         g_free(conf_file);
 486
 487         conf_file = g_strdup_printf(VPN_STATEDIR "/connman-ppp-option.conf");
 488         unlink(conf_file);
 489         g_free(conf_file);
 490 }
 491
 492 struct request_input_reply {
 493         struct vpn_provider *provider;
 494         vpn_provider_password_cb_t callback;
 495         void *user_data;
 496 };
 497
 498 static void request_input_reply(DBusMessage *reply, void *user_data)
 499 {
 500         struct request_input_reply *l2tp_reply = user_data;
 501         struct l2tp_private_data *data;
 502         const char *error = NULL;
 503         char *username = NULL, *password = NULL;
 504         char *key;
 505         DBusMessageIter iter, dict;
 506         int err;
 507
 508         DBG("provider %p", l2tp_reply->provider);
 509
 510         if (!reply)
 511                 goto done;
 512
 513         data = l2tp_reply->user_data;
 514
 515         err = vpn_agent_check_and_process_reply_error(reply,
 516                                 l2tp_reply->provider, data->task, data->cb,
 517                                 data->user_data);
 518         if (err) {
 519                 /* Ensure cb is called only once */
 520                 data->cb = NULL;
 521                 data->user_data = NULL;
 522                 error = dbus_message_get_error_name(reply);
 523                 goto done;
 524         }
 525
 526         if (!vpn_agent_check_reply_has_dict(reply))
 527                 goto done;
 528
 529         dbus_message_iter_init(reply, &iter);
 530         dbus_message_iter_recurse(&iter, &dict);
 531         while (dbus_message_iter_get_arg_type(&dict) == DBUS_TYPE_DICT_ENTRY) {
 532                 DBusMessageIter entry, value;
 533                 const char *str;
 534
 535                 dbus_message_iter_recurse(&dict, &entry);
 536                 if (dbus_message_iter_get_arg_type(&entry) != DBUS_TYPE_STRING)
 537                         break;
 538
 539                 dbus_message_iter_get_basic(&entry, &key);
 540
 541                 if (g_str_equal(key, "Username")) {
 542                         dbus_message_iter_next(&entry);
 543                         if (dbus_message_iter_get_arg_type(&entry)
 544                                                         != DBUS_TYPE_VARIANT)
 545                                 break;
 546                         dbus_message_iter_recurse(&entry, &value);
 547                         if (dbus_message_iter_get_arg_type(&value)
 548                                                         != DBUS_TYPE_STRING)
 549                                 break;
 550                         dbus_message_iter_get_basic(&value, &str);
 551                         username = g_strdup(str);
 552                 }
 553
 554                 if (g_str_equal(key, "Password")) {
 555                         dbus_message_iter_next(&entry);
 556                         if (dbus_message_iter_get_arg_type(&entry)
 557                                                         != DBUS_TYPE_VARIANT)
 558                                 break;
 559                         dbus_message_iter_recurse(&entry, &value);
 560                         if (dbus_message_iter_get_arg_type(&value)
 561                                                         != DBUS_TYPE_STRING)
 562                                 break;
 563                         dbus_message_iter_get_basic(&value, &str);
 564                         password = g_strdup(str);
 565                 }
 566
 567                 dbus_message_iter_next(&dict);
 568         }
 569
 570 done:
 571         l2tp_reply->callback(l2tp_reply->provider, username, password, error,
 572                                 l2tp_reply->user_data);
 573
 574         g_free(username);
 575         g_free(password);
 576
 577         g_free(l2tp_reply);
 578 }
 579
 580 typedef void (* request_cb_t)(struct vpn_provider *provider,
 581                                 const char *username, const char *password,
 582                                 const char *error, void *user_data);
 583
 584 static int request_input(struct vpn_provider *provider,
 585                         request_cb_t callback, const char *dbus_sender,
 586                         void *user_data)
 587 {
 588         DBusMessage *message;
 589         const char *path, *agent_sender, *agent_path;
 590         DBusMessageIter iter;
 591         DBusMessageIter dict;
 592         struct request_input_reply *l2tp_reply;
 593         int err;
 594         void *agent;
 595
 596         agent = connman_agent_get_info(dbus_sender, &agent_sender,
 597                                                         &agent_path);
 598         if (!provider || !agent || !agent_path || !callback)
 599                 return -ESRCH;
 600
 601         message = dbus_message_new_method_call(agent_sender, agent_path,
 602                                         VPN_AGENT_INTERFACE,
 603                                         "RequestInput");
 604         if (!message)
 605                 return -ENOMEM;
 606
 607         dbus_message_iter_init_append(message, &iter);
 608
 609         path = vpn_provider_get_path(provider);
 610         dbus_message_iter_append_basic(&iter,
 611                                 DBUS_TYPE_OBJECT_PATH, &path);
 612
 613         connman_dbus_dict_open(&iter, &dict);
 614
 615         if (vpn_provider_get_authentication_errors(provider))
 616                 vpn_agent_append_auth_failure(&dict, provider, NULL);
 617
 618         vpn_agent_append_user_info(&dict, provider, "L2TP.User");
 619
 620         vpn_agent_append_host_and_name(&dict, provider);
 621
 622         connman_dbus_dict_close(&iter, &dict);
 623
 624         l2tp_reply = g_try_new0(struct request_input_reply, 1);
 625         if (!l2tp_reply) {
 626                 dbus_message_unref(message);
 627                 return -ENOMEM;
 628         }
 629
 630         l2tp_reply->provider = provider;
 631         l2tp_reply->callback = callback;
 632         l2tp_reply->user_data = user_data;
 633
 634         err = connman_agent_queue_message(provider, message,
 635                         connman_timeout_input_request(),
 636                         request_input_reply, l2tp_reply, agent);
 637         if (err < 0 && err != -EBUSY) {
 638                 DBG("error %d sending agent request", err);
 639                 dbus_message_unref(message);
 640                 g_free(l2tp_reply);
 641                 return err;
 642         }
 643
 644         dbus_message_unref(message);
 645
 646         return -EINPROGRESS;
 647 }
 648
 649 static int run_connect(struct vpn_provider *provider,
 650                         struct connman_task *task, const char *if_name,
 651                         vpn_provider_connect_cb_t cb, void *user_data,
 652                         const char *username, const char *password)
 653 {
 654         char *l2tp_name, *pppd_name;
 655         int l2tp_fd, pppd_fd;
 656         int err;
 657
 658         if (!username || !*username || !password || !*password) {
 659                 DBG("Cannot connect username %s password %p",
 660                                                 username, password);
 661                 err = -EINVAL;
 662                 goto done;
 663         }
 664
 665         DBG("username %s password %p", username, password);
 666
 667         l2tp_name = g_strdup_printf(VPN_STATEDIR "/connman-xl2tpd.conf");
 668
 669         l2tp_fd = open(l2tp_name, O_RDWR|O_CREAT|O_TRUNC, S_IRUSR|S_IWUSR);
 670         if (l2tp_fd < 0) {
 671                 g_free(l2tp_name);
 672                 connman_error("Error writing l2tp config");
 673                 err = -EIO;
 674                 goto done;
 675         }
 676
 677         pppd_name = g_strdup_printf(VPN_STATEDIR "/connman-ppp-option.conf");
 678
 679         pppd_fd = open(pppd_name, O_RDWR|O_CREAT|O_TRUNC, S_IRUSR|S_IWUSR);
 680         if (pppd_fd < 0) {
 681                 connman_error("Error writing pppd config");
 682                 g_free(l2tp_name);
 683                 g_free(pppd_name);
 684                 close(l2tp_fd);
 685                 err = -EIO;
 686                 goto done;
 687         }
 688
 689         l2tp_write_config(provider, pppd_name, l2tp_fd);
 690
 691         write_pppd_option(provider, pppd_fd);
 692
 693         connman_task_add_argument(task, "-D", NULL);
 694         connman_task_add_argument(task, "-c", l2tp_name);
 695
 696         g_free(l2tp_name);
 697         g_free(pppd_name);
 698         close(l2tp_fd);
 699         close(pppd_fd);
 700
 701         err = connman_task_run(task, l2tp_died, provider,
 702                                 NULL, NULL, NULL);
 703         if (err < 0) {
 704                 connman_error("l2tp failed to start");
 705                 err = -EIO;
 706                 goto done;
 707         }
 708
 709 done:
 710         if (cb)
 711                 cb(provider, user_data, err);
 712
 713         return err;
 714 }
 715
 716 static void free_private_data(struct l2tp_private_data *data)
 717 {
 718         g_free(data->if_name);
 719         g_free(data);
 720 }
 721
 722 static void request_input_cb(struct vpn_provider *provider,
 723                         const char *username,
 724                         const char *password,
 725                         const char *error, void *user_data)
 726 {
 727         struct l2tp_private_data *data = user_data;
 728
 729         if (!username || !*username || !password || !*password)
 730                 DBG("Requesting username %s or password failed, error %s",
 731                         username, error);
 732         else if (error)
 733                 DBG("error %s", error);
 734
 735         vpn_provider_set_string(provider, "L2TP.User", username);
 736         vpn_provider_set_string_hide_value(provider, "L2TP.Password",
 737                                                                 password);
 738
 739         run_connect(provider, data->task, data->if_name, data->cb,
 740                 data->user_data, username, password);
 741
 742         free_private_data(data);
 743 }
 744
 745 static int l2tp_connect(struct vpn_provider *provider,
 746                         struct connman_task *task, const char *if_name,
 747                         vpn_provider_connect_cb_t cb, const char *dbus_sender,
 748                         void *user_data)
 749 {
 750         const char *username, *password;
 751         int err;
 752
 753         if (connman_task_set_notify(task, "getsec",
 754                                         l2tp_get_sec, provider) != 0) {
 755                 err = -ENOMEM;
 756                 goto error;
 757         }
 758
 759         username = vpn_provider_get_string(provider, "L2TP.User");
 760         password = vpn_provider_get_string(provider, "L2TP.Password");
 761
 762         DBG("user %s password %p", username, password);
 763
 764         if (!username || !*username || !password || !*password) {
 765                 struct l2tp_private_data *data;
 766
 767                 data = g_try_new0(struct l2tp_private_data, 1);
 768                 if (!data)
 769                         return -ENOMEM;
 770
 771                 data->task = task;
 772                 data->if_name = g_strdup(if_name);
 773                 data->cb = cb;
 774                 data->user_data = user_data;
 775
 776                 err = request_input(provider, request_input_cb, dbus_sender,
 777                                                                         data);
 778                 if (err != -EINPROGRESS) {
 779                         free_private_data(data);
 780                         goto done;
 781                 }
 782                 return err;
 783         }
 784
 785 done:
 786         return run_connect(provider, task, if_name, cb, user_data,
 787                                                         username, password);
 788
 789 error:
 790         if (cb)
 791                 cb(provider, user_data, err);
 792
 793         return err;
 794 }
 795
 796 static int l2tp_error_code(struct vpn_provider *provider, int exit_code)
 797 {
 798         switch (exit_code) {
 799         case 1:
 800                 return CONNMAN_PROVIDER_ERROR_CONNECT_FAILED;
 801         default:
 802                 return CONNMAN_PROVIDER_ERROR_UNKNOWN;
 803         }
 804 }
 805
 806 static void l2tp_disconnect(struct vpn_provider *provider)
 807 {
 808         if (!provider)
 809                 return;
 810
 811         vpn_provider_set_string_hide_value(provider, "L2TP.Password", NULL);
 812
 813         connman_agent_cancel(provider);
 814 }
 815
 816 static struct vpn_driver vpn_driver = {
 817         .flags          = VPN_FLAG_NO_TUN,
 818         .notify         = l2tp_notify,
 819         .connect        = l2tp_connect,
 820         .error_code     = l2tp_error_code,
 821         .save           = l2tp_save,
 822         .disconnect     = l2tp_disconnect,
 823 };
 824
 825 static int l2tp_init(void)
 826 {
 827         connection = connman_dbus_get_connection();
 828
 829         return vpn_register("l2tp", &vpn_driver, L2TP);
 830 }
 831
 832 static void l2tp_exit(void)
 833 {
 834         vpn_unregister("l2tp");
 835
 836         dbus_connection_unref(connection);
 837 }
 838
 839 CONNMAN_PLUGIN_DEFINE(l2tp, "l2tp plugin", VERSION,
 840         CONNMAN_PLUGIN_PRIORITY_DEFAULT, l2tp_init, l2tp_exit)