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         vpn_provider_set_ipaddress(provider, ipaddress);
 250         vpn_provider_set_nameservers(provider, nameservers);
 251
 252         g_free(addressv4);
 253         g_free(netmask);
 254         g_free(gateway);
 255         g_free(nameservers);
 256         connman_ipaddress_free(ipaddress);
 257
 258         return VPN_STATE_CONNECT;
 259 }
 260
 261 static int l2tp_save(struct vpn_provider *provider, GKeyFile *keyfile)
 262 {
 263         const char *option;
 264         bool l2tp_option, pppd_option;
 265         int i;
 266
 267         for (i = 0; i < (int)ARRAY_SIZE(pppd_options); i++) {
 268                 l2tp_option = pppd_option = false;
 269
 270                 if (strncmp(pppd_options[i].cm_opt, "L2TP.", 5) == 0)
 271                         l2tp_option = true;
 272
 273                 if (strncmp(pppd_options[i].cm_opt, "PPPD.", 5) == 0)
 274                         pppd_option = true;
 275
 276                 if (l2tp_option || pppd_option) {
 277                         option = vpn_provider_get_string(provider,
 278                                                 pppd_options[i].cm_opt);
 279                         if (!option) {
 280                                 /*
 281                                  * Check if the option prefix is L2TP as the
 282                                  * PPPD options were using L2TP prefix earlier.
 283                                  */
 284                                 char *l2tp_str;
 285
 286                                 if (!pppd_option)
 287                                         continue;
 288
 289                                 l2tp_str = g_strdup_printf("L2TP.%s",
 290                                                 &pppd_options[i].cm_opt[5]);
 291                                 option = vpn_provider_get_string(provider,
 292                                                                 l2tp_str);
 293                                 g_free(l2tp_str);
 294
 295                                 if (!option)
 296                                         continue;
 297                         }
 298
 299                         g_key_file_set_string(keyfile,
 300                                         vpn_provider_get_save_group(provider),
 301                                         pppd_options[i].cm_opt, option);
 302                 }
 303         }
 304
 305         return 0;
 306 }
 307
 308 static ssize_t full_write(int fd, const void *buf, size_t len)
 309 {
 310         ssize_t byte_write;
 311
 312         while (len) {
 313                 byte_write = write(fd, buf, len);
 314                 if (byte_write < 0) {
 315                         connman_error("failed to write config to l2tp: %s\n",
 316                                         strerror(errno));
 317                         return byte_write;
 318                 }
 319                 len -= byte_write;
 320                 buf += byte_write;
 321         }
 322
 323         return 0;
 324 }
 325
 326 static ssize_t l2tp_write_bool_option(int fd,
 327                                         const char *key, const char *value)
 328 {
 329         gchar *buf;
 330         ssize_t ret = 0;
 331
 332         if (key && value) {
 333                 if (strcasecmp(value, "yes") == 0 ||
 334                                 strcasecmp(value, "true") == 0 ||
 335                                 strcmp(value, "1") == 0) {
 336                         buf = g_strdup_printf("%s\n", key);
 337                         ret = full_write(fd, buf, strlen(buf));
 338
 339                         g_free(buf);
 340                 }
 341         }
 342
 343         return ret;
 344 }
 345
 346 static int l2tp_write_option(int fd, const char *key, const char *value)
 347 {
 348         gchar *buf;
 349         ssize_t ret = 0;
 350
 351         if (key) {
 352                 if (value)
 353                         buf = g_strdup_printf("%s %s\n", key, value);
 354                 else
 355                         buf = g_strdup_printf("%s\n", key);
 356
 357                 ret = full_write(fd, buf, strlen(buf));
 358
 359                 g_free(buf);
 360         }
 361
 362         return ret;
 363 }
 364
 365 static int l2tp_write_section(int fd, const char *key, const char *value)
 366 {
 367         gchar *buf;
 368         ssize_t ret = 0;
 369
 370         if (key && value) {
 371                 buf = g_strdup_printf("%s = %s\n", key, value);
 372                 ret = full_write(fd, buf, strlen(buf));
 373
 374                 g_free(buf);
 375         }
 376
 377         return ret;
 378 }
 379
 380 static int write_pppd_option(struct vpn_provider *provider, int fd)
 381 {
 382         int i;
 383         const char *opt_s;
 384
 385         l2tp_write_option(fd, "nodetach", NULL);
 386         l2tp_write_option(fd, "lock", NULL);
 387         l2tp_write_option(fd, "logfd", "2");
 388         l2tp_write_option(fd, "usepeerdns", NULL);
 389         l2tp_write_option(fd, "noipdefault", NULL);
 390         l2tp_write_option(fd, "noauth", NULL);
 391         l2tp_write_option(fd, "nodefaultroute", NULL);
 392         l2tp_write_option(fd, "ipparam", "l2tp_plugin");
 393
 394         for (i = 0; i < (int)ARRAY_SIZE(pppd_options); i++) {
 395                 if (pppd_options[i].sub != OPT_ALL &&
 396                         pppd_options[i].sub != OPT_PPPD)
 397                         continue;
 398
 399                 opt_s = vpn_provider_get_string(provider,
 400                                         pppd_options[i].cm_opt);
 401                 if (!opt_s)
 402                         opt_s = pppd_options[i].vpn_default;
 403
 404                 if (!opt_s)
 405                         continue;
 406
 407                 if (pppd_options[i].type == OPT_STRING)
 408                         l2tp_write_option(fd,
 409                                 pppd_options[i].pppd_opt, opt_s);
 410                 else if (pppd_options[i].type == OPT_BOOL)
 411                         l2tp_write_bool_option(fd,
 412                                 pppd_options[i].pppd_opt, opt_s);
 413         }
 414
 415         l2tp_write_option(fd, "plugin",
 416                                 SCRIPTDIR "/libppp-plugin.so");
 417
 418         return 0;
 419 }
 420
 421
 422 static int l2tp_write_fields(struct vpn_provider *provider,
 423                                                 int fd, int sub)
 424 {
 425         int i;
 426         const char *opt_s;
 427
 428         for (i = 0; i < (int)ARRAY_SIZE(pppd_options); i++) {
 429                 if (pppd_options[i].sub != sub)
 430                         continue;
 431
 432                 opt_s = vpn_provider_get_string(provider,
 433                                         pppd_options[i].cm_opt);
 434                 if (!opt_s)
 435                         opt_s = pppd_options[i].vpn_default;
 436
 437                 if (!opt_s)
 438                         continue;
 439
 440                 if (pppd_options[i].type == OPT_STRING)
 441                         l2tp_write_section(fd,
 442                                 pppd_options[i].pppd_opt, opt_s);
 443                 else if (pppd_options[i].type == OPT_BOOL)
 444                         l2tp_write_bool_option(fd,
 445                                 pppd_options[i].pppd_opt, opt_s);
 446         }
 447
 448         return 0;
 449 }
 450
 451 static int l2tp_write_config(struct vpn_provider *provider,
 452                                         const char *pppd_name, int fd)
 453 {
 454         const char *option;
 455
 456         l2tp_write_option(fd, "[global]", NULL);
 457         l2tp_write_fields(provider, fd, OPT_L2G);
 458
 459         l2tp_write_option(fd, "[lns default]", NULL);
 460         l2tp_write_fields(provider, fd, OPT_L2LNS);
 461
 462         l2tp_write_option(fd, "[lac l2tp]", NULL);
 463
 464         option = vpn_provider_get_string(provider, "Host");
 465         l2tp_write_option(fd, "lns =", option);
 466
 467         l2tp_write_fields(provider, fd, OPT_ALL);
 468         l2tp_write_fields(provider, fd, OPT_L2);
 469
 470         l2tp_write_option(fd, "pppoptfile =", pppd_name);
 471
 472         return 0;
 473 }
 474
 475 static void l2tp_died(struct connman_task *task, int exit_code, void *user_data)
 476 {
 477         char *conf_file;
 478
 479         vpn_died(task, exit_code, user_data);
 480
 481         conf_file = g_strdup_printf(VPN_STATEDIR "/connman-xl2tpd.conf");
 482         unlink(conf_file);
 483         g_free(conf_file);
 484
 485         conf_file = g_strdup_printf(VPN_STATEDIR "/connman-ppp-option.conf");
 486         unlink(conf_file);
 487         g_free(conf_file);
 488 }
 489
 490 struct request_input_reply {
 491         struct vpn_provider *provider;
 492         vpn_provider_password_cb_t callback;
 493         void *user_data;
 494 };
 495
 496 static void request_input_reply(DBusMessage *reply, void *user_data)
 497 {
 498         struct request_input_reply *l2tp_reply = user_data;
 499         struct l2tp_private_data *data;
 500         const char *error = NULL;
 501         char *username = NULL, *password = NULL;
 502         char *key;
 503         DBusMessageIter iter, dict;
 504         int err;
 505
 506         DBG("provider %p", l2tp_reply->provider);
 507
 508         if (!reply)
 509                 goto done;
 510
 511         data = l2tp_reply->user_data;
 512
 513         err = vpn_agent_check_and_process_reply_error(reply,
 514                                 l2tp_reply->provider, data->task, data->cb,
 515                                 data->user_data);
 516         if (err) {
 517                 /* Ensure cb is called only once */
 518                 data->cb = NULL;
 519                 data->user_data = NULL;
 520                 error = dbus_message_get_error_name(reply);
 521                 goto done;
 522         }
 523
 524         if (!vpn_agent_check_reply_has_dict(reply))
 525                 goto done;
 526
 527         dbus_message_iter_init(reply, &iter);
 528         dbus_message_iter_recurse(&iter, &dict);
 529         while (dbus_message_iter_get_arg_type(&dict) == DBUS_TYPE_DICT_ENTRY) {
 530                 DBusMessageIter entry, value;
 531                 const char *str;
 532
 533                 dbus_message_iter_recurse(&dict, &entry);
 534                 if (dbus_message_iter_get_arg_type(&entry) != DBUS_TYPE_STRING)
 535                         break;
 536
 537                 dbus_message_iter_get_basic(&entry, &key);
 538
 539                 if (g_str_equal(key, "Username")) {
 540                         dbus_message_iter_next(&entry);
 541                         if (dbus_message_iter_get_arg_type(&entry)
 542                                                         != DBUS_TYPE_VARIANT)
 543                                 break;
 544                         dbus_message_iter_recurse(&entry, &value);
 545                         if (dbus_message_iter_get_arg_type(&value)
 546                                                         != DBUS_TYPE_STRING)
 547                                 break;
 548                         dbus_message_iter_get_basic(&value, &str);
 549                         username = g_strdup(str);
 550                 }
 551
 552                 if (g_str_equal(key, "Password")) {
 553                         dbus_message_iter_next(&entry);
 554                         if (dbus_message_iter_get_arg_type(&entry)
 555                                                         != DBUS_TYPE_VARIANT)
 556                                 break;
 557                         dbus_message_iter_recurse(&entry, &value);
 558                         if (dbus_message_iter_get_arg_type(&value)
 559                                                         != DBUS_TYPE_STRING)
 560                                 break;
 561                         dbus_message_iter_get_basic(&value, &str);
 562                         password = g_strdup(str);
 563                 }
 564
 565                 dbus_message_iter_next(&dict);
 566         }
 567
 568 done:
 569         l2tp_reply->callback(l2tp_reply->provider, username, password, error,
 570                                 l2tp_reply->user_data);
 571
 572         g_free(username);
 573         g_free(password);
 574
 575         g_free(l2tp_reply);
 576 }
 577
 578 typedef void (* request_cb_t)(struct vpn_provider *provider,
 579                                 const char *username, const char *password,
 580                                 const char *error, void *user_data);
 581
 582 static int request_input(struct vpn_provider *provider,
 583                         request_cb_t callback, const char *dbus_sender,
 584                         void *user_data)
 585 {
 586         DBusMessage *message;
 587         const char *path, *agent_sender, *agent_path;
 588         DBusMessageIter iter;
 589         DBusMessageIter dict;
 590         struct request_input_reply *l2tp_reply;
 591         int err;
 592         void *agent;
 593
 594         agent = connman_agent_get_info(dbus_sender, &agent_sender,
 595                                                         &agent_path);
 596         if (!provider || !agent || !agent_path || !callback)
 597                 return -ESRCH;
 598
 599         message = dbus_message_new_method_call(agent_sender, agent_path,
 600                                         VPN_AGENT_INTERFACE,
 601                                         "RequestInput");
 602         if (!message)
 603                 return -ENOMEM;
 604
 605         dbus_message_iter_init_append(message, &iter);
 606
 607         path = vpn_provider_get_path(provider);
 608         dbus_message_iter_append_basic(&iter,
 609                                 DBUS_TYPE_OBJECT_PATH, &path);
 610
 611         connman_dbus_dict_open(&iter, &dict);
 612
 613         if (vpn_provider_get_authentication_errors(provider))
 614                 vpn_agent_append_auth_failure(&dict, provider, NULL);
 615
 616         vpn_agent_append_user_info(&dict, provider, "L2TP.User");
 617
 618         vpn_agent_append_host_and_name(&dict, provider);
 619
 620         connman_dbus_dict_close(&iter, &dict);
 621
 622         l2tp_reply = g_try_new0(struct request_input_reply, 1);
 623         if (!l2tp_reply) {
 624                 dbus_message_unref(message);
 625                 return -ENOMEM;
 626         }
 627
 628         l2tp_reply->provider = provider;
 629         l2tp_reply->callback = callback;
 630         l2tp_reply->user_data = user_data;
 631
 632         err = connman_agent_queue_message(provider, message,
 633                         connman_timeout_input_request(),
 634                         request_input_reply, l2tp_reply, agent);
 635         if (err < 0 && err != -EBUSY) {
 636                 DBG("error %d sending agent request", err);
 637                 dbus_message_unref(message);
 638                 g_free(l2tp_reply);
 639                 return err;
 640         }
 641
 642         dbus_message_unref(message);
 643
 644         return -EINPROGRESS;
 645 }
 646
 647 static int run_connect(struct vpn_provider *provider,
 648                         struct connman_task *task, const char *if_name,
 649                         vpn_provider_connect_cb_t cb, void *user_data,
 650                         const char *username, const char *password)
 651 {
 652         char *l2tp_name, *pppd_name;
 653         int l2tp_fd, pppd_fd;
 654         int err;
 655
 656         if (!username || !*username || !password || !*password) {
 657                 DBG("Cannot connect username %s password %p",
 658                                                 username, password);
 659                 err = -EINVAL;
 660                 goto done;
 661         }
 662
 663         DBG("username %s password %p", username, password);
 664
 665         l2tp_name = g_strdup_printf(VPN_STATEDIR "/connman-xl2tpd.conf");
 666
 667         l2tp_fd = open(l2tp_name, O_RDWR|O_CREAT|O_TRUNC, S_IRUSR|S_IWUSR);
 668         if (l2tp_fd < 0) {
 669                 g_free(l2tp_name);
 670                 connman_error("Error writing l2tp config");
 671                 err = -EIO;
 672                 goto done;
 673         }
 674
 675         pppd_name = g_strdup_printf(VPN_STATEDIR "/connman-ppp-option.conf");
 676
 677         pppd_fd = open(pppd_name, O_RDWR|O_CREAT|O_TRUNC, S_IRUSR|S_IWUSR);
 678         if (pppd_fd < 0) {
 679                 connman_error("Error writing pppd config");
 680                 g_free(l2tp_name);
 681                 g_free(pppd_name);
 682                 close(l2tp_fd);
 683                 err = -EIO;
 684                 goto done;
 685         }
 686
 687         l2tp_write_config(provider, pppd_name, l2tp_fd);
 688
 689         write_pppd_option(provider, pppd_fd);
 690
 691         connman_task_add_argument(task, "-D", NULL);
 692         connman_task_add_argument(task, "-c", l2tp_name);
 693
 694         g_free(l2tp_name);
 695         g_free(pppd_name);
 696         close(l2tp_fd);
 697         close(pppd_fd);
 698
 699         err = connman_task_run(task, l2tp_died, provider,
 700                                 NULL, NULL, NULL);
 701         if (err < 0) {
 702                 connman_error("l2tp failed to start");
 703                 err = -EIO;
 704                 goto done;
 705         }
 706
 707 done:
 708         if (cb)
 709                 cb(provider, user_data, err);
 710
 711         return err;
 712 }
 713
 714 static void free_private_data(struct l2tp_private_data *data)
 715 {
 716         g_free(data->if_name);
 717         g_free(data);
 718 }
 719
 720 static void request_input_cb(struct vpn_provider *provider,
 721                         const char *username,
 722                         const char *password,
 723                         const char *error, void *user_data)
 724 {
 725         struct l2tp_private_data *data = user_data;
 726
 727         if (!username || !*username || !password || !*password)
 728                 DBG("Requesting username %s or password failed, error %s",
 729                         username, error);
 730         else if (error)
 731                 DBG("error %s", error);
 732
 733         vpn_provider_set_string(provider, "L2TP.User", username);
 734         vpn_provider_set_string_hide_value(provider, "L2TP.Password",
 735                                                                 password);
 736
 737         run_connect(provider, data->task, data->if_name, data->cb,
 738                 data->user_data, username, password);
 739
 740         free_private_data(data);
 741 }
 742
 743 static int l2tp_connect(struct vpn_provider *provider,
 744                         struct connman_task *task, const char *if_name,
 745                         vpn_provider_connect_cb_t cb, const char *dbus_sender,
 746                         void *user_data)
 747 {
 748         const char *username, *password;
 749         int err;
 750
 751         if (connman_task_set_notify(task, "getsec",
 752                                         l2tp_get_sec, provider) != 0) {
 753                 err = -ENOMEM;
 754                 goto error;
 755         }
 756
 757         username = vpn_provider_get_string(provider, "L2TP.User");
 758         password = vpn_provider_get_string(provider, "L2TP.Password");
 759
 760         DBG("user %s password %p", username, password);
 761
 762         if (!username || !*username || !password || !*password) {
 763                 struct l2tp_private_data *data;
 764
 765                 data = g_try_new0(struct l2tp_private_data, 1);
 766                 if (!data)
 767                         return -ENOMEM;
 768
 769                 data->task = task;
 770                 data->if_name = g_strdup(if_name);
 771                 data->cb = cb;
 772                 data->user_data = user_data;
 773
 774                 err = request_input(provider, request_input_cb, dbus_sender,
 775                                                                         data);
 776                 if (err != -EINPROGRESS) {
 777                         free_private_data(data);
 778                         goto done;
 779                 }
 780                 return err;
 781         }
 782
 783 done:
 784         return run_connect(provider, task, if_name, cb, user_data,
 785                                                         username, password);
 786
 787 error:
 788         if (cb)
 789                 cb(provider, user_data, err);
 790
 791         return err;
 792 }
 793
 794 static int l2tp_error_code(struct vpn_provider *provider, int exit_code)
 795 {
 796         switch (exit_code) {
 797         case 1:
 798                 return CONNMAN_PROVIDER_ERROR_CONNECT_FAILED;
 799         default:
 800                 return CONNMAN_PROVIDER_ERROR_UNKNOWN;
 801         }
 802 }
 803
 804 static void l2tp_disconnect(struct vpn_provider *provider)
 805 {
 806         if (!provider)
 807                 return;
 808
 809         vpn_provider_set_string_hide_value(provider, "L2TP.Password", NULL);
 810
 811         connman_agent_cancel(provider);
 812 }
 813
 814 static struct vpn_driver vpn_driver = {
 815         .flags          = VPN_FLAG_NO_TUN,
 816         .notify         = l2tp_notify,
 817         .connect        = l2tp_connect,
 818         .error_code     = l2tp_error_code,
 819         .save           = l2tp_save,
 820         .disconnect     = l2tp_disconnect,
 821 };
 822
 823 static int l2tp_init(void)
 824 {
 825         connection = connman_dbus_get_connection();
 826
 827         return vpn_register("l2tp", &vpn_driver, L2TP);
 828 }
 829
 830 static void l2tp_exit(void)
 831 {
 832         vpn_unregister("l2tp");
 833
 834         dbus_connection_unref(connection);
 835 }
 836
 837 CONNMAN_PLUGIN_DEFINE(l2tp, "l2tp plugin", VERSION,
 838         CONNMAN_PLUGIN_PRIORITY_DEFAULT, l2tp_init, l2tp_exit)