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