plugins/openvpn.c

   1 /*
   2  *
   3  *  Connection Manager
   4  *
   5  *  Copyright (C) 2010  BMW Car IT GmbH. All rights reserved.
   6  *
   7  *  This program is free software; you can redistribute it and/or modify
   8  *  it under the terms of the GNU General Public License version 2 as
   9  *  published by the Free Software Foundation.
  10  *
  11  *  This program is distributed in the hope that it will be useful,
  12  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  *  GNU General Public License for more details.
  15  *
  16  *  You should have received a copy of the GNU General Public License
  17  *  along with this program; if not, write to the Free Software
  18  *  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  19  *
  20  */
  21
  22 #ifdef HAVE_CONFIG_H
  23 #include <config.h>
  24 #endif
  25
  26 #include <string.h>
  27 #include <errno.h>
  28 #include <unistd.h>
  29 #include <stdio.h>
  30 #include <net/if.h>
  31
  32 #include <glib.h>
  33
  34 #define CONNMAN_API_SUBJECT_TO_CHANGE
  35 #include <connman/plugin.h>
  36 #include <connman/provider.h>
  37 #include <connman/log.h>
  38 #include <connman/task.h>
  39 #include <connman/dbus.h>
  40
  41 #include "vpn.h"
  42
  43 static DBusConnection *connection;
  44
  45 static int ov_notify(DBusMessage *msg, struct connman_provider *provider)
  46 {
  47         DBusMessageIter iter, dict;
  48         const char *reason, *key, *value;
  49         const char *domain = NULL;
  50         char *dns_entries = NULL;
  51
  52         dbus_message_iter_init(msg, &iter);
  53
  54         dbus_message_iter_get_basic(&iter, &reason);
  55         dbus_message_iter_next(&iter);
  56
  57         dbus_message_iter_init(msg, &iter);
  58
  59         dbus_message_iter_get_basic(&iter, &reason);
  60         dbus_message_iter_next(&iter);
  61
  62         if (!provider) {
  63                 connman_error("No provider found");
  64                 return VPN_STATE_FAILURE;
  65         }
  66
  67         if (strcmp(reason, "up"))
  68                 return VPN_STATE_DISCONNECT;
  69
  70         domain = connman_provider_get_string(provider, "VPN.Domain");
  71
  72         dbus_message_iter_recurse(&iter, &dict);
  73
  74         while (dbus_message_iter_get_arg_type(&dict) == DBUS_TYPE_DICT_ENTRY) {
  75                 DBusMessageIter entry;
  76
  77                 dbus_message_iter_recurse(&dict, &entry);
  78                 dbus_message_iter_get_basic(&entry, &key);
  79                 dbus_message_iter_next(&entry);
  80                 dbus_message_iter_get_basic(&entry, &value);
  81
  82                 DBG("%s = %s", key, value);
  83
  84                 if (!strcmp(key, "trusted_ip"))
  85                         connman_provider_set_string(provider, "Gateway", value);
  86
  87                 if (!strcmp(key, "ifconfig_local"))
  88                         connman_provider_set_string(provider, "Address", value);
  89
  90                 if (!strcmp(key, "route_vpn_gateway"))
  91                         connman_provider_set_string(provider, "Peer", value);
  92
  93                 if (g_str_has_prefix(key, "foreign_option_")) {
  94                         gchar **options;
  95
  96                         options = g_strsplit(value, " ", 3);
  97                         if (options[0] != NULL &&
  98                                         !strcmp(options[0], "dhcp-option") &&
  99                                         options[1] != NULL &&
 100                                         !strcmp(options[1], "DNS") &&
 101                                         options[2] != NULL) {
 102
 103                                 if (dns_entries != NULL) {
 104                                         char *tmp;
 105
 106                                         tmp = g_strjoin(" ", dns_entries,
 107                                                         options[2], NULL);
 108                                         g_free(dns_entries);
 109                                         dns_entries = tmp;
 110                                 } else {
 111                                         dns_entries = g_strdup(options[2]);
 112                                 }
 113                         }
 114
 115                         g_strfreev(options);
 116                 }
 117
 118                 dbus_message_iter_next(&dict);
 119         }
 120
 121         if (dns_entries != NULL) {
 122                 connman_provider_set_string(provider, "DNS", dns_entries);
 123                 g_free(dns_entries);
 124         }
 125
 126         return VPN_STATE_CONNECT;
 127 }
 128
 129 static int ov_connect(struct connman_provider *provider,
 130                 struct connman_task *task, const char *if_name)
 131 {
 132         const char *vpnhost, *cafile, *mtu, *certfile, *keyfile;
 133         int err, fd;
 134
 135         vpnhost = connman_provider_get_string(provider, "Host");
 136         if (!vpnhost) {
 137                 connman_error("Host not set; cannot enable VPN");
 138                 return -EINVAL;
 139         }
 140
 141         cafile = connman_provider_get_string(provider, "OpenVPN.CACert");
 142         certfile = connman_provider_get_string(provider, "OpenVPN.Cert");
 143         keyfile = connman_provider_get_string(provider, "OpenVPN.Key");
 144         mtu = connman_provider_get_string(provider, "VPN.MTU");
 145
 146         if (mtu)
 147                 connman_task_add_argument(task, "--mtu", (char *)mtu);
 148
 149         connman_task_add_argument(task, "--syslog", NULL);
 150
 151         connman_task_add_argument(task, "--script-security", "2");
 152
 153         connman_task_add_argument(task, "--up",
 154                                         SCRIPTDIR "/openvpn-script");
 155         connman_task_add_argument(task, "--up-restart", NULL);
 156
 157         connman_task_add_argument(task, "--setenv", NULL);
 158         connman_task_add_argument(task, "CONNMAN_BUSNAME",
 159                                         dbus_bus_get_unique_name(connection));
 160
 161         connman_task_add_argument(task, "--setenv", NULL);
 162         connman_task_add_argument(task, "CONNMAN_INTERFACE",
 163                                         CONNMAN_TASK_INTERFACE);
 164
 165         connman_task_add_argument(task, "--setenv", NULL);
 166         connman_task_add_argument(task, "CONNMAN_PATH",
 167                                         connman_task_get_path(task));
 168
 169         connman_task_add_argument(task, "--dev", if_name);
 170         connman_task_add_argument(task, "--dev-type", "tun");
 171
 172         connman_task_add_argument(task, "--tls-client", NULL);
 173         connman_task_add_argument(task, "--remote", (char *)vpnhost);
 174         connman_task_add_argument(task, "--nobind", NULL);
 175         connman_task_add_argument(task, "--persist-key", NULL);
 176         connman_task_add_argument(task, "--persist-tun", NULL);
 177
 178         connman_task_add_argument(task, "--route-noexec", NULL);
 179         connman_task_add_argument(task, "--ifconfig-noexec", NULL);
 180
 181         /*
 182          * Disable client restarts because we can't handle this at the
 183          * moment. The problem is that when OpenVPN decides to switch
 184          * from CONNECTED state to RECONNECTING and then to RESOLVE,
 185          * it is not possible to do a DNS lookup. The DNS server is
 186          * not accessable through the tunnel anymore and so we end up
 187          * trying to resolve the OpenVPN servers address.
 188          */
 189         connman_task_add_argument(task, "--ping-restart", "0");
 190
 191         connman_task_add_argument(task, "--client", NULL);
 192
 193         if (cafile) {
 194                 connman_task_add_argument(task, "--ca",
 195                                                 (char *)cafile);
 196         }
 197
 198         if (certfile) {
 199                 connman_task_add_argument(task, "--cert",
 200                                                 (char *)certfile);
 201         }
 202
 203         if (keyfile) {
 204                 connman_task_add_argument(task, "--key",
 205                                                 (char *)keyfile);
 206         }
 207
 208         fd = fileno(stderr);
 209         err = connman_task_run(task, vpn_died, provider,
 210                         NULL, &fd, &fd);
 211         if (err < 0) {
 212                 connman_error("openvpn failed to start");
 213                 return -EIO;
 214         }
 215
 216         return 0;
 217 }
 218
 219 static struct vpn_driver vpn_driver = {
 220         .notify = ov_notify,
 221         .connect        = ov_connect,
 222 };
 223
 224 static int openvpn_init(void)
 225 {
 226         connection = connman_dbus_get_connection();
 227
 228         return vpn_register("openvpn", &vpn_driver, OPENVPN);
 229 }
 230
 231 static void openvpn_exit(void)
 232 {
 233         vpn_unregister("openvpn");
 234
 235         dbus_connection_unref(connection);
 236 }
 237
 238 CONNMAN_PLUGIN_DEFINE(openvpn, "OpenVPN plugin", VERSION,
 239         CONNMAN_PLUGIN_PRIORITY_DEFAULT, openvpn_init, openvpn_exit)