vpn/plugins/l2tp.c

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