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 #include <connman/ipconfig.h>
  41
  42 #include "vpn.h"
  43
  44 #define ARRAY_SIZE(a) (sizeof(a)/sizeof(a[0]))
  45
  46 static DBusConnection *connection;
  47
  48 struct {
  49         const char *cm_opt;
  50         const char *ov_opt;
  51 } ov_options[] = {
  52         { "Host", "--remote" },
  53         { "OpenVPN.CACert", "--ca" },
  54         { "OpenVPN.Cert", "--cert" },
  55         { "OpenVPN.Key", "--key" },
  56         { "OpenVPN.MTU", "--mtu" },
  57         { "OpenVPN.Proto", "--proto" },
  58         { "OpenVPN.Port", "--port" },
  59         { "OpenVPN.AuthUserPass", "--auth-user-pass" },
  60         { "OpenVPN.TLSRemote", "--tls-remote" },
  61         { "OpenVPN.Cipher", "--cipher" },
  62         { "OpenVPN.Auth", "--auth" },
  63         { "OpenVPN.CompLZO", "--comp-lzo" },
  64 };
  65
  66 static void ov_append_dns_entries(const char *key, const char *value,
  67                                         char **dns_entries)
  68 {
  69         gchar **options;
  70
  71         if (g_str_has_prefix(key, "foreign_option_") == FALSE)
  72                 return;
  73
  74         options = g_strsplit(value, " ", 3);
  75         if (options[0] != NULL &&
  76                 !strcmp(options[0], "dhcp-option") &&
  77                         options[1] != NULL &&
  78                         !strcmp(options[1], "DNS") &&
  79                                 options[2] != NULL) {
  80
  81                 if (*dns_entries != NULL) {
  82                         char *tmp;
  83
  84                         tmp = g_strjoin(" ", *dns_entries,
  85                                                 options[2], NULL);
  86                         g_free(*dns_entries);
  87                         *dns_entries = tmp;
  88                 } else {
  89                         *dns_entries = g_strdup(options[2]);
  90                 }
  91         }
  92
  93         g_strfreev(options);
  94 }
  95
  96 static int ov_notify(DBusMessage *msg, struct connman_provider *provider)
  97 {
  98         DBusMessageIter iter, dict;
  99         const char *reason, *key, *value;
 100         const char *domain = NULL;
 101         char *nameservers = NULL;
 102         char *address = NULL, *gateway = NULL, *peer = NULL;
 103         struct connman_ipaddress *ipaddress;
 104
 105         dbus_message_iter_init(msg, &iter);
 106
 107         dbus_message_iter_get_basic(&iter, &reason);
 108         dbus_message_iter_next(&iter);
 109
 110         if (!provider) {
 111                 connman_error("No provider found");
 112                 return VPN_STATE_FAILURE;
 113         }
 114
 115         if (strcmp(reason, "up"))
 116                 return VPN_STATE_DISCONNECT;
 117
 118         domain = connman_provider_get_string(provider, "VPN.Domain");
 119
 120         dbus_message_iter_recurse(&iter, &dict);
 121
 122         while (dbus_message_iter_get_arg_type(&dict) == DBUS_TYPE_DICT_ENTRY) {
 123                 DBusMessageIter entry;
 124
 125                 dbus_message_iter_recurse(&dict, &entry);
 126                 dbus_message_iter_get_basic(&entry, &key);
 127                 dbus_message_iter_next(&entry);
 128                 dbus_message_iter_get_basic(&entry, &value);
 129
 130                 DBG("%s = %s", key, value);
 131
 132                 if (!strcmp(key, "trusted_ip")) {
 133                         connman_provider_set_string(provider, "Gateway", value);
 134                         gateway = g_strdup(value);
 135                 }
 136
 137                 if (!strcmp(key, "ifconfig_local")) {
 138                         connman_provider_set_string(provider, "Address", value);
 139                         address = g_strdup(value);
 140                 }
 141
 142                 if (!strcmp(key, "ifconfig_remote")) {
 143                         connman_provider_set_string(provider, "Peer", value);
 144                         peer = g_strdup(value);
 145                 }
 146
 147                 if (g_str_has_prefix(key, "route_") == TRUE)
 148                         connman_provider_append_route(provider, key, value);
 149
 150                 ov_append_dns_entries(key, value, &nameservers);
 151
 152                 dbus_message_iter_next(&dict);
 153         }
 154
 155         ipaddress = connman_ipaddress_alloc(AF_INET);
 156         if (ipaddress == NULL) {
 157                 g_free(nameservers);
 158                 g_free(address);
 159                 g_free(gateway);
 160                 g_free(peer);
 161
 162                 return VPN_STATE_FAILURE;
 163         }
 164
 165         connman_ipaddress_set_ipv4(ipaddress, address, NULL, gateway);
 166         connman_ipaddress_set_peer(ipaddress, peer);
 167         connman_provider_set_ipaddress(provider, ipaddress);
 168
 169         connman_provider_set_nameservers(provider, nameservers);
 170
 171         g_free(nameservers);
 172         g_free(address);
 173         g_free(gateway);
 174         g_free(peer);
 175         connman_ipaddress_free(ipaddress);
 176
 177         return VPN_STATE_CONNECT;
 178 }
 179
 180 static int task_append_config_data(struct connman_provider *provider,
 181                                         struct connman_task *task)
 182 {
 183         const char *option;
 184         int i;
 185
 186         for (i = 0; i < (int)ARRAY_SIZE(ov_options); i++) {
 187                 option = connman_provider_get_string(provider,
 188                                         ov_options[i].cm_opt);
 189                 if (option == NULL)
 190                         continue;
 191
 192                 if (connman_task_add_argument(task,
 193                                         ov_options[i].ov_opt, option) < 0) {
 194                         return -EIO;
 195                 }
 196         }
 197
 198         return 0;
 199 }
 200
 201 static int ov_connect(struct connman_provider *provider,
 202                 struct connman_task *task, const char *if_name)
 203 {
 204         const char *option;
 205         int err, fd;
 206
 207         option = connman_provider_get_string(provider, "Host");
 208         if (option == NULL) {
 209                 connman_error("Host not set; cannot enable VPN");
 210                 return -EINVAL;
 211         }
 212
 213         task_append_config_data(provider, task);
 214
 215         connman_task_add_argument(task, "--syslog", NULL);
 216
 217         connman_task_add_argument(task, "--script-security", "2");
 218
 219         connman_task_add_argument(task, "--up",
 220                                         SCRIPTDIR "/openvpn-script");
 221         connman_task_add_argument(task, "--up-restart", NULL);
 222
 223         connman_task_add_argument(task, "--setenv", NULL);
 224         connman_task_add_argument(task, "CONNMAN_BUSNAME",
 225                                         dbus_bus_get_unique_name(connection));
 226
 227         connman_task_add_argument(task, "--setenv", NULL);
 228         connman_task_add_argument(task, "CONNMAN_INTERFACE",
 229                                         CONNMAN_TASK_INTERFACE);
 230
 231         connman_task_add_argument(task, "--setenv", NULL);
 232         connman_task_add_argument(task, "CONNMAN_PATH",
 233                                         connman_task_get_path(task));
 234
 235         connman_task_add_argument(task, "--dev", if_name);
 236         connman_task_add_argument(task, "--dev-type", "tun");
 237
 238         connman_task_add_argument(task, "--tls-client", NULL);
 239         connman_task_add_argument(task, "--nobind", NULL);
 240         connman_task_add_argument(task, "--persist-key", NULL);
 241         connman_task_add_argument(task, "--persist-tun", NULL);
 242
 243         connman_task_add_argument(task, "--route-noexec", NULL);
 244         connman_task_add_argument(task, "--ifconfig-noexec", NULL);
 245
 246         /*
 247          * Disable client restarts because we can't handle this at the
 248          * moment. The problem is that when OpenVPN decides to switch
 249          * from CONNECTED state to RECONNECTING and then to RESOLVE,
 250          * it is not possible to do a DNS lookup. The DNS server is
 251          * not accessable through the tunnel anymore and so we end up
 252          * trying to resolve the OpenVPN servers address.
 253          */
 254         connman_task_add_argument(task, "--ping-restart", "0");
 255
 256         connman_task_add_argument(task, "--client", NULL);
 257
 258         fd = fileno(stderr);
 259         err = connman_task_run(task, vpn_died, provider,
 260                         NULL, &fd, &fd);
 261         if (err < 0) {
 262                 connman_error("openvpn failed to start");
 263                 return -EIO;
 264         }
 265
 266         return 0;
 267 }
 268
 269 static struct vpn_driver vpn_driver = {
 270         .notify = ov_notify,
 271         .connect        = ov_connect,
 272 };
 273
 274 static int openvpn_init(void)
 275 {
 276         connection = connman_dbus_get_connection();
 277
 278         return vpn_register("openvpn", &vpn_driver, OPENVPN);
 279 }
 280
 281 static void openvpn_exit(void)
 282 {
 283         vpn_unregister("openvpn");
 284
 285         dbus_connection_unref(connection);
 286 }
 287
 288 CONNMAN_PLUGIN_DEFINE(openvpn, "OpenVPN plugin", VERSION,
 289         CONNMAN_PLUGIN_PRIORITY_DEFAULT, openvpn_init, openvpn_exit)