plugins/pptp.c

   1 /*
   2  *
   3  *  Connection Manager
   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 <stdio.h>
  31 #include <net/if.h>
  32
  33 #include <glib.h>
  34
  35 #define CONNMAN_API_SUBJECT_TO_CHANGE
  36 #include <connman/plugin.h>
  37 #include <connman/provider.h>
  38 #include <connman/log.h>
  39 #include <connman/task.h>
  40 #include <connman/dbus.h>
  41 #include <connman/inet.h>
  42
  43 #include "vpn.h"
  44
  45 #define ARRAY_SIZE(a) (sizeof(a)/sizeof(a[0]))
  46
  47 enum {
  48         OPT_STRING = 1,
  49         OPT_BOOL = 2,
  50 };
  51
  52 struct {
  53         const char *cm_opt;
  54         const char *pptp_opt;
  55         const char *vpnc_default;
  56         int type;
  57 } pptp_options[] = {
  58         { "PPTP.User", "user", NULL, OPT_STRING },
  59         { "PPTP.EchoFailure", "lcp-echo-failure", "0", OPT_STRING },
  60         { "PPTP.EchoInterval", "lcp-echo-interval", "0", OPT_STRING },
  61         { "PPTP.Debug", "debug", NULL, OPT_STRING },
  62         { "PPTP.RefuseEAP", "refuse-eap", NULL, OPT_BOOL },
  63         { "PPTP.RefusePAP", "refuse-pap", NULL, OPT_BOOL },
  64         { "PPTP.RefuseCHAP", "refuse-chap", NULL, OPT_BOOL },
  65         { "PPTP.RefuseMSCHAP", "refuse-mschap", NULL, OPT_BOOL },
  66         { "PPTP.RefuseMSCHAP2", "refuse-mschapv2", NULL, OPT_BOOL },
  67         { "PPTP.NoBSDComp", "nobsdcomp", NULL, OPT_BOOL },
  68         { "PPTP.NoDeflate", "nodeflatey", NULL, OPT_BOOL },
  69         { "PPTP.RequirMPPE", "require-mppe", NULL, OPT_BOOL },
  70         { "PPTP.RequirMPPE40", "require-mppe-40", NULL, OPT_BOOL },
  71         { "PPTP.RequirMPPE128", "require-mppe-128", NULL, OPT_BOOL },
  72         { "PPTP.RequirMPPEStateful", "mppe-stateful", NULL, OPT_BOOL },
  73         { "PPTP.NoVJ", "no-vj-comp", NULL, OPT_BOOL },
  74 };
  75
  76 static DBusConnection *connection;
  77
  78 static DBusMessage *pptp_get_sec(struct connman_task *task,
  79                                 DBusMessage *msg, void *user_data)
  80 {
  81         const char *user, *passwd;
  82         struct connman_provider *provider = user_data;
  83         DBusMessage *reply;
  84
  85         if (dbus_message_get_no_reply(msg) == TRUE)
  86                 return NULL;
  87
  88         user = connman_provider_get_string(provider, "PPTP.User");
  89         passwd = connman_provider_get_string(provider, "PPTP.Password");
  90         if (user == NULL || strlen(user) == 0 ||
  91                                 passwd == NULL || strlen(passwd) == 0)
  92                 return NULL;
  93
  94         reply = dbus_message_new_method_return(msg);
  95         if (reply == NULL)
  96                 return NULL;
  97
  98         dbus_message_append_args(reply, DBUS_TYPE_STRING, &user,
  99                                 DBUS_TYPE_STRING, &passwd,
 100                                 DBUS_TYPE_INVALID);
 101         return reply;
 102 }
 103
 104 static int pptp_notify(DBusMessage *msg, struct connman_provider *provider)
 105 {
 106         DBusMessageIter iter, dict;
 107         const char *reason, *key, *value;
 108         char *addressv4 = NULL, *netmask = NULL, *gateway = NULL;
 109         char *ifname = NULL, *nameservers = NULL;
 110         struct connman_ipaddress *ipaddress = NULL;
 111
 112         dbus_message_iter_init(msg, &iter);
 113
 114         dbus_message_iter_get_basic(&iter, &reason);
 115         dbus_message_iter_next(&iter);
 116
 117         if (provider == NULL) {
 118                 connman_error("No provider found");
 119                 return VPN_STATE_FAILURE;
 120         }
 121
 122         if (strcmp(reason, "auth failed") == 0)
 123                 return VPN_STATE_AUTH_FAILURE;
 124
 125         if (strcmp(reason, "connect"))
 126                 return VPN_STATE_DISCONNECT;
 127
 128         dbus_message_iter_recurse(&iter, &dict);
 129
 130         while (dbus_message_iter_get_arg_type(&dict) == DBUS_TYPE_DICT_ENTRY) {
 131                 DBusMessageIter entry;
 132
 133                 dbus_message_iter_recurse(&dict, &entry);
 134                 dbus_message_iter_get_basic(&entry, &key);
 135                 dbus_message_iter_next(&entry);
 136                 dbus_message_iter_get_basic(&entry, &value);
 137
 138                 DBG("%s = %s", key, value);
 139
 140                 if (!strcmp(key, "INTERNAL_IP4_ADDRESS")) {
 141                         connman_provider_set_string(provider, "Address", value);
 142                         addressv4 = g_strdup(value);
 143                 }
 144
 145                 if (!strcmp(key, "INTERNAL_IP4_NETMASK")) {
 146                         connman_provider_set_string(provider, "Netmask", value);
 147                         netmask = g_strdup(value);
 148                 }
 149
 150                 if (!strcmp(key, "INTERNAL_IP4_DNS")) {
 151                         connman_provider_set_string(provider, "DNS", value);
 152                         nameservers = g_strdup(value);
 153                 }
 154
 155                 if (!strcmp(key, "INTERNAL_IFNAME"))
 156                         ifname = g_strdup(value);
 157
 158                 dbus_message_iter_next(&dict);
 159         }
 160
 161         if (vpn_set_ifname(provider, ifname) < 0) {
 162                 g_free(ifname);
 163                 g_free(addressv4);
 164                 g_free(netmask);
 165                 g_free(nameservers);
 166                 return VPN_STATE_FAILURE;
 167         }
 168
 169         if (addressv4 != NULL)
 170                 ipaddress = connman_ipaddress_alloc(AF_INET);
 171
 172         g_free(ifname);
 173
 174         if (ipaddress == NULL) {
 175                 connman_error("No IP address for provider");
 176                 g_free(addressv4);
 177                 g_free(netmask);
 178                 g_free(nameservers);
 179                 return VPN_STATE_FAILURE;
 180         }
 181
 182         value = connman_provider_get_string(provider, "Host");
 183         if (value != NULL) {
 184                 connman_provider_set_string(provider, "Gateway", value);
 185                 gateway = g_strdup(value);
 186         }
 187
 188         if (addressv4 != NULL)
 189                 connman_ipaddress_set_ipv4(ipaddress, addressv4, netmask,
 190                                         gateway);
 191
 192         connman_provider_set_ipaddress(provider, ipaddress);
 193         connman_provider_set_nameservers(provider, nameservers);
 194
 195         g_free(addressv4);
 196         g_free(netmask);
 197         g_free(gateway);
 198         g_free(nameservers);
 199         connman_ipaddress_free(ipaddress);
 200
 201         return VPN_STATE_CONNECT;
 202 }
 203
 204 static int pptp_save(struct connman_provider *provider, GKeyFile *keyfile)
 205 {
 206         const char *option;
 207         int i;
 208
 209         for (i = 0; i < (int)ARRAY_SIZE(pptp_options); i++) {
 210                 if (strncmp(pptp_options[i].cm_opt, "PPTP.", 5) == 0) {
 211                         option = connman_provider_get_string(provider,
 212                                                         pptp_options[i].cm_opt);
 213                         if (option == NULL)
 214                                 continue;
 215
 216                         g_key_file_set_string(keyfile,
 217                                         connman_provider_get_save_group(provider),
 218                                         pptp_options[i].cm_opt, option);
 219                 }
 220         }
 221         return 0;
 222 }
 223
 224 static void pptp_write_bool_option(struct connman_task *task,
 225                                 const char *key, const char *value)
 226 {
 227         if (key != NULL && value != NULL) {
 228                 if (strcmp(value, "yes") == 0)
 229                         connman_task_add_argument(task, key, NULL);
 230         }
 231 }
 232
 233 static int pptp_connect(struct connman_provider *provider,
 234                 struct connman_task *task, const char *if_name)
 235 {
 236         const char *opt_s, *host;
 237         char *str;
 238         int err, i;
 239
 240         if (connman_task_set_notify(task, "getsec",
 241                                         pptp_get_sec, provider))
 242                 return -ENOMEM;
 243
 244         host = connman_provider_get_string(provider, "Host");
 245         if (host == NULL) {
 246                 connman_error("Host not set; cannot enable VPN");
 247                 return -EINVAL;
 248         }
 249
 250         str = g_strdup_printf("%s %s --nolaunchpppd --loglevel 2",
 251                                 PPTP, host);
 252         if (str == NULL) {
 253                 connman_error("can not allocate memory");
 254                 return -ENOMEM;
 255         }
 256
 257         connman_task_add_argument(task, "pty", str);
 258         g_free(str);
 259
 260         connman_task_add_argument(task, "nodetach", NULL);
 261         connman_task_add_argument(task, "lock", NULL);
 262         connman_task_add_argument(task, "usepeerdns", NULL);
 263         connman_task_add_argument(task, "noipdefault", NULL);
 264         connman_task_add_argument(task, "noauth", NULL);
 265         connman_task_add_argument(task, "nodefaultroute", NULL);
 266         connman_task_add_argument(task, "ipparam", "pptp_plugin");
 267
 268         for (i = 0; i < (int)ARRAY_SIZE(pptp_options); i++) {
 269                 opt_s = connman_provider_get_string(provider,
 270                                         pptp_options[i].cm_opt);
 271                 if (opt_s == NULL)
 272                         opt_s = pptp_options[i].vpnc_default;
 273
 274                 if (opt_s == NULL)
 275                         continue;
 276
 277                 if (pptp_options[i].type == OPT_STRING)
 278                         connman_task_add_argument(task,
 279                                         pptp_options[i].pptp_opt, opt_s);
 280                 else if (pptp_options[i].type == OPT_BOOL)
 281                         pptp_write_bool_option(task,
 282                                         pptp_options[i].pptp_opt, opt_s);
 283         }
 284
 285         connman_task_add_argument(task, "plugin",
 286                                 SCRIPTDIR "/libppp-plugin.so");
 287
 288         err = connman_task_run(task, vpn_died, provider,
 289                                 NULL, NULL, NULL);
 290         if (err < 0) {
 291                 connman_error("pptp failed to start");
 292                 return -EIO;
 293         }
 294
 295         return 0;
 296 }
 297
 298 static int pptp_error_code(int exit_code)
 299 {
 300
 301         switch (exit_code) {
 302         case 1:
 303                 return CONNMAN_PROVIDER_ERROR_CONNECT_FAILED;
 304         case 2:
 305                 return CONNMAN_PROVIDER_ERROR_LOGIN_FAILED;
 306         case 16:
 307                 return CONNMAN_PROVIDER_ERROR_AUTH_FAILED;
 308         default:
 309                 return CONNMAN_PROVIDER_ERROR_UNKNOWN;
 310         }
 311 }
 312
 313 static struct vpn_driver vpn_driver = {
 314         .flags          = VPN_FLAG_NO_TUN,
 315         .notify         = pptp_notify,
 316         .connect        = pptp_connect,
 317         .error_code     = pptp_error_code,
 318         .save           = pptp_save,
 319 };
 320
 321 static int pptp_init(void)
 322 {
 323         connection = connman_dbus_get_connection();
 324
 325         return vpn_register("pptp", &vpn_driver, PPPD);
 326 }
 327
 328 static void pptp_exit(void)
 329 {
 330         vpn_unregister("pptp");
 331
 332         dbus_connection_unref(connection);
 333 }
 334
 335 CONNMAN_PLUGIN_DEFINE(pptp, "pptp plugin", VERSION,
 336         CONNMAN_PLUGIN_PRIORITY_DEFAULT, pptp_init, pptp_exit)