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 #define ARRAY_SIZE(a) (sizeof(a)/sizeof(a[0]))
  44
  45 static DBusConnection *connection;
  46
  47 struct {
  48         const char *cm_opt;
  49         const char *ov_opt;
  50 } ov_options[] = {
  51         { "Host", "--remote" },
  52         { "OpenVPN.CACert", "--ca" },
  53         { "OpenVPN.Cert", "--cert" },
  54         { "OpenVPN.Key", "--key" },
  55         { "OpenVPN.MTU", "--mtu" },
  56         { "OpenVPN.Proto", "--proto" },
  57         { "OpenVPN.Port", "--port" },
  58         { "OpenVPN.AuthUserPass", "--auth-user-pass" },
  59         { "OpenVPN.TLSRemote", "--tls-remote" },
  60         { "OpenVPN.Cipher", "--cipher" },
  61         { "OpenVPN.Auth", "--auth" },
  62         { "OpenVPN.CompLZO", "--comp-lzo" },
  63 };
  64
  65 static void ov_append_dns_entries(const char *key, const char *value,
  66                                         char **dns_entries)
  67 {
  68         gchar **options;
  69
  70         if (g_str_has_prefix(key, "foreign_option_") == FALSE)
  71                 return;
  72
  73         options = g_strsplit(value, " ", 3);
  74         if (options[0] != NULL &&
  75                 !strcmp(options[0], "dhcp-option") &&
  76                         options[1] != NULL &&
  77                         !strcmp(options[1], "DNS") &&
  78                                 options[2] != NULL) {
  79
  80                 if (*dns_entries != NULL) {
  81                         char *tmp;
  82
  83                         tmp = g_strjoin(" ", *dns_entries,
  84                                                 options[2], NULL);
  85                         g_free(*dns_entries);
  86                         *dns_entries = tmp;
  87                 } else {
  88                         *dns_entries = g_strdup(options[2]);
  89                 }
  90         }
  91
  92         g_strfreev(options);
  93 }
  94
  95 static int ov_notify(DBusMessage *msg, struct connman_provider *provider)
  96 {
  97         DBusMessageIter iter, dict;
  98         const char *reason, *key, *value;
  99         const char *domain = NULL;
 100         char *dns_entries = NULL;
 101
 102         dbus_message_iter_init(msg, &iter);
 103
 104         dbus_message_iter_get_basic(&iter, &reason);
 105         dbus_message_iter_next(&iter);
 106
 107         if (!provider) {
 108                 connman_error("No provider found");
 109                 return VPN_STATE_FAILURE;
 110         }
 111
 112         if (strcmp(reason, "up"))
 113                 return VPN_STATE_DISCONNECT;
 114
 115         domain = connman_provider_get_string(provider, "VPN.Domain");
 116
 117         dbus_message_iter_recurse(&iter, &dict);
 118
 119         while (dbus_message_iter_get_arg_type(&dict) == DBUS_TYPE_DICT_ENTRY) {
 120                 DBusMessageIter entry;
 121
 122                 dbus_message_iter_recurse(&dict, &entry);
 123                 dbus_message_iter_get_basic(&entry, &key);
 124                 dbus_message_iter_next(&entry);
 125                 dbus_message_iter_get_basic(&entry, &value);
 126
 127                 DBG("%s = %s", key, value);
 128
 129                 if (!strcmp(key, "trusted_ip"))
 130                         connman_provider_set_string(provider, "Gateway", value);
 131
 132                 if (!strcmp(key, "ifconfig_local"))
 133                         connman_provider_set_string(provider, "Address", value);
 134
 135                 if (!strcmp(key, "ifconfig_remote"))
 136                         connman_provider_set_string(provider, "Peer", value);
 137
 138                 if (g_str_has_prefix(key, "route_") == TRUE)
 139                         connman_provider_append_route(provider, key, value);
 140
 141                 ov_append_dns_entries(key, value, &dns_entries);
 142
 143                 dbus_message_iter_next(&dict);
 144         }
 145
 146         if (dns_entries != NULL) {
 147                 connman_provider_set_string(provider, "DNS", dns_entries);
 148                 g_free(dns_entries);
 149         }
 150
 151         return VPN_STATE_CONNECT;
 152 }
 153
 154 static int task_append_config_data(struct connman_provider *provider,
 155                                         struct connman_task *task)
 156 {
 157         const char *option;
 158         int i;
 159
 160         for (i = 0; i < (int)ARRAY_SIZE(ov_options); i++) {
 161                 option = connman_provider_get_string(provider,
 162                                         ov_options[i].cm_opt);
 163                 if (option == NULL)
 164                         continue;
 165
 166                 if (connman_task_add_argument(task,
 167                                         ov_options[i].ov_opt, option) < 0) {
 168                         return -EIO;
 169                 }
 170         }
 171
 172         return 0;
 173 }
 174
 175 static int ov_connect(struct connman_provider *provider,
 176                 struct connman_task *task, const char *if_name)
 177 {
 178         const char *option;
 179         int err, fd;
 180
 181         option = connman_provider_get_string(provider, "Host");
 182         if (option == NULL) {
 183                 connman_error("Host not set; cannot enable VPN");
 184                 return -EINVAL;
 185         }
 186
 187         task_append_config_data(provider, task);
 188
 189         connman_task_add_argument(task, "--syslog", NULL);
 190
 191         connman_task_add_argument(task, "--script-security", "2");
 192
 193         connman_task_add_argument(task, "--up",
 194                                         SCRIPTDIR "/openvpn-script");
 195         connman_task_add_argument(task, "--up-restart", NULL);
 196
 197         connman_task_add_argument(task, "--setenv", NULL);
 198         connman_task_add_argument(task, "CONNMAN_BUSNAME",
 199                                         dbus_bus_get_unique_name(connection));
 200
 201         connman_task_add_argument(task, "--setenv", NULL);
 202         connman_task_add_argument(task, "CONNMAN_INTERFACE",
 203                                         CONNMAN_TASK_INTERFACE);
 204
 205         connman_task_add_argument(task, "--setenv", NULL);
 206         connman_task_add_argument(task, "CONNMAN_PATH",
 207                                         connman_task_get_path(task));
 208
 209         connman_task_add_argument(task, "--dev", if_name);
 210         connman_task_add_argument(task, "--dev-type", "tun");
 211
 212         connman_task_add_argument(task, "--tls-client", NULL);
 213         connman_task_add_argument(task, "--nobind", NULL);
 214         connman_task_add_argument(task, "--persist-key", NULL);
 215         connman_task_add_argument(task, "--persist-tun", NULL);
 216
 217         connman_task_add_argument(task, "--route-noexec", NULL);
 218         connman_task_add_argument(task, "--ifconfig-noexec", NULL);
 219
 220         /*
 221          * Disable client restarts because we can't handle this at the
 222          * moment. The problem is that when OpenVPN decides to switch
 223          * from CONNECTED state to RECONNECTING and then to RESOLVE,
 224          * it is not possible to do a DNS lookup. The DNS server is
 225          * not accessable through the tunnel anymore and so we end up
 226          * trying to resolve the OpenVPN servers address.
 227          */
 228         connman_task_add_argument(task, "--ping-restart", "0");
 229
 230         connman_task_add_argument(task, "--client", NULL);
 231
 232         fd = fileno(stderr);
 233         err = connman_task_run(task, vpn_died, provider,
 234                         NULL, &fd, &fd);
 235         if (err < 0) {
 236                 connman_error("openvpn failed to start");
 237                 return -EIO;
 238         }
 239
 240         return 0;
 241 }
 242
 243 static struct vpn_driver vpn_driver = {
 244         .notify = ov_notify,
 245         .connect        = ov_connect,
 246 };
 247
 248 static int openvpn_init(void)
 249 {
 250         connection = connman_dbus_get_connection();
 251
 252         return vpn_register("openvpn", &vpn_driver, OPENVPN);
 253 }
 254
 255 static void openvpn_exit(void)
 256 {
 257         vpn_unregister("openvpn");
 258
 259         dbus_connection_unref(connection);
 260 }
 261
 262 CONNMAN_PLUGIN_DEFINE(openvpn, "OpenVPN plugin", VERSION,
 263         CONNMAN_PLUGIN_PRIORITY_DEFAULT, openvpn_init, openvpn_exit)