plugins/vpnc.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/ipconfig.h>
  40 #include <connman/dbus.h>
  41
  42 #include "vpn.h"
  43
  44 #define ARRAY_SIZE(a) (sizeof(a)/sizeof(a[0]))
  45
  46 static DBusConnection *connection;
  47
  48 enum {
  49         OPT_STRING = 1,
  50         OPT_BOOLEAN = 2,
  51 };
  52
  53 struct {
  54         const char *cm_opt;
  55         const char *vpnc_opt;
  56         const char *vpnc_default;
  57         int type;
  58         connman_bool_t cm_save;
  59 } vpnc_options[] = {
  60         { "Host", "IPSec gateway", NULL, OPT_STRING, TRUE },
  61         { "VPNC.IPSec.ID", "IPSec ID", NULL, OPT_STRING, TRUE },
  62         { "VPNC.IPSec.Secret", "IPSec secret", NULL, OPT_STRING, FALSE },
  63         { "VPNC.Xauth.Username", "Xauth username", NULL, OPT_STRING, FALSE },
  64         { "VPNC.Xauth.Password", "Xauth password", NULL, OPT_STRING, FALSE },
  65         { "VPNC.IKE.Authmode", "IKE Authmode", NULL, OPT_STRING, TRUE },
  66         { "VPNC.IKE.DHGroup", "IKE DH Group", NULL, OPT_STRING, TRUE },
  67         { "VPNC.PFS", "Perfect Forward Secrecy", NULL, OPT_STRING, TRUE },
  68         { "VPNC.Domain", "Domain", NULL, OPT_STRING, TRUE },
  69         { "VPNC.Vendor", "Vendor", NULL, OPT_STRING, TRUE },
  70         { "VPNC.LocalPort", "Local Port", "0", OPT_STRING, TRUE, },
  71         { "VPNC.CiscoPort","Cisco UDP Encapsulation Port", "0", OPT_STRING,
  72           TRUE },
  73         { "VPNC.AppVersion", "Application Version", NULL, OPT_STRING, TRUE },
  74         { "VPNC.NATTMode", "NAT Traversal Mode", "cisco-udp", OPT_STRING,
  75           TRUE },
  76         { "VPNC.DPDTimeout", "DPD idle timeout (our side)", NULL, OPT_STRING,
  77           TRUE },
  78         { "VPNC.SingleDES", "Enable Single DES", NULL, OPT_BOOLEAN, TRUE },
  79         { "VPNC.NoEncryption", "Enable no encryption", NULL, OPT_BOOLEAN,
  80           TRUE },
  81 };
  82
  83 static int vc_notify(DBusMessage *msg, struct connman_provider *provider)
  84 {
  85         DBusMessageIter iter, dict;
  86         char *address = NULL, *netmask = NULL, *gateway = NULL;
  87         struct connman_ipaddress *ipaddress;
  88         const char *reason, *key, *value;
  89
  90         dbus_message_iter_init(msg, &iter);
  91
  92         dbus_message_iter_get_basic(&iter, &reason);
  93         dbus_message_iter_next(&iter);
  94
  95         if (!provider) {
  96                 connman_error("No provider found");
  97                 return VPN_STATE_FAILURE;
  98         }
  99
 100         if (strcmp(reason, "connect"))
 101                 return VPN_STATE_DISCONNECT;
 102
 103         dbus_message_iter_recurse(&iter, &dict);
 104
 105         while (dbus_message_iter_get_arg_type(&dict) == DBUS_TYPE_DICT_ENTRY) {
 106                 DBusMessageIter entry;
 107
 108                 dbus_message_iter_recurse(&dict, &entry);
 109                 dbus_message_iter_get_basic(&entry, &key);
 110                 dbus_message_iter_next(&entry);
 111                 dbus_message_iter_get_basic(&entry, &value);
 112
 113                 DBG("%s = %s", key, value);
 114
 115                 if (!strcmp(key, "VPNGATEWAY"))
 116                         gateway = g_strdup(value);
 117
 118                 if (!strcmp(key, "INTERNAL_IP4_ADDRESS"))
 119                         address = g_strdup(value);
 120
 121                 if (!strcmp(key, "INTERNAL_IP4_NETMASK"))
 122                         netmask = g_strdup(value);
 123
 124                 if (!strcmp(key, "INTERNAL_IP4_DNS"))
 125                         connman_provider_set_nameservers(provider, value);
 126
 127                 if (!strcmp(key, "CISCO_DEF_DOMAIN"))
 128                         connman_provider_set_domain(provider, value);
 129
 130                 if (g_str_has_prefix(key, "CISCO_SPLIT_INC") == TRUE ||
 131                         g_str_has_prefix(key, "CISCO_IPV6_SPLIT_INC") == TRUE)
 132                         connman_provider_append_route(provider, key, value);
 133
 134                 dbus_message_iter_next(&dict);
 135         }
 136
 137
 138         ipaddress = connman_ipaddress_alloc(AF_INET);
 139         if (ipaddress == NULL) {
 140                 g_free(address);
 141                 g_free(netmask);
 142                 g_free(gateway);
 143
 144                 return VPN_STATE_FAILURE;
 145         }
 146
 147         connman_ipaddress_set_ipv4(ipaddress, address, netmask, gateway);
 148         connman_provider_set_ipaddress(provider, ipaddress);
 149
 150         g_free(address);
 151         g_free(netmask);
 152         g_free(gateway);
 153         connman_ipaddress_free(ipaddress);
 154
 155         return VPN_STATE_CONNECT;
 156 }
 157
 158 static ssize_t full_write(int fd, const void *buf, size_t len)
 159 {
 160         ssize_t byte_write;
 161
 162         while (len) {
 163                 byte_write = write(fd, buf, len);
 164                 if (byte_write < 0) {
 165                         connman_error("failed to write config to vpnc: %s\n",
 166                                         strerror(errno));
 167                         return byte_write;
 168                 }
 169                 len -= byte_write;
 170                 buf += byte_write;
 171         }
 172
 173         return 0;
 174 }
 175
 176 static ssize_t write_option(int fd, const char *key, const char *value)
 177 {
 178         gchar *buf;
 179         ssize_t ret = 0;
 180
 181         if (key != NULL && value != NULL) {
 182                 buf = g_strdup_printf("%s %s\n", key, value);
 183                 ret = full_write(fd, buf, strlen(buf));
 184
 185                 g_free(buf);
 186         }
 187
 188         return ret;
 189 }
 190
 191 static ssize_t write_bool_option(int fd, const char *key, const char *value)
 192 {
 193         gchar *buf;
 194         ssize_t ret = 0;
 195
 196         if (key != NULL && value != NULL) {
 197                 if (strcasecmp(value, "yes") == 0 ||
 198                                 strcasecmp(value, "true") == 0 ||
 199                                 strcmp(value, "1") == 0) {
 200                         buf = g_strdup_printf("%s\n", key);
 201                         ret = full_write(fd, buf, strlen(buf));
 202
 203                         g_free(buf);
 204                 }
 205         }
 206
 207         return ret;
 208 }
 209
 210 static int vc_write_config_data(struct connman_provider *provider, int fd)
 211 {
 212         const char *opt_s;
 213         int i;
 214
 215         for (i = 0; i < (int)ARRAY_SIZE(vpnc_options); i++) {
 216                 opt_s = connman_provider_get_string(provider,
 217                                         vpnc_options[i].cm_opt);
 218                 if (!opt_s)
 219                         opt_s= vpnc_options[i].vpnc_default;
 220
 221                 if(!opt_s)
 222                         continue;
 223
 224                 if (vpnc_options[i].type == OPT_STRING) {
 225                         if (write_option(fd,
 226                                         vpnc_options[i].vpnc_opt, opt_s) < 0)
 227                                 return -EIO;
 228                 } else if (vpnc_options[i].type == OPT_BOOLEAN) {
 229                         if (write_bool_option(fd,
 230                                         vpnc_options[i].vpnc_opt, opt_s) < 0)
 231                                 return -EIO;
 232                 }
 233
 234         }
 235
 236         return 0;
 237 }
 238
 239 static int vc_save(struct connman_provider *provider, GKeyFile *keyfile)
 240 {
 241         const char *option;
 242         int i;
 243
 244         for (i = 0; i < (int)ARRAY_SIZE(vpnc_options); i++) {
 245                 if (strncmp(vpnc_options[i].cm_opt, "VPNC.", 5) == 0) {
 246
 247                         if (vpnc_options[i].cm_save == FALSE)
 248                                 continue;
 249
 250                         option = connman_provider_get_string(provider,
 251                                                         vpnc_options[i].cm_opt);
 252                         if (option == NULL)
 253                                 continue;
 254
 255                         g_key_file_set_string(keyfile,
 256                                         connman_provider_get_save_group(provider),
 257                                         vpnc_options[i].cm_opt, option);
 258                 }
 259         }
 260         return 0;
 261 }
 262
 263 static int vc_connect(struct connman_provider *provider,
 264                 struct connman_task *task, const char *if_name)
 265 {
 266         const char *option;
 267         int err, fd;
 268
 269         option = connman_provider_get_string(provider, "Host");
 270         if (option == NULL) {
 271                 connman_error("Host not set; cannot enable VPN");
 272                 return -EINVAL;
 273         }
 274         option = connman_provider_get_string(provider, "VPNC.IPSec.ID");
 275         if (option == NULL) {
 276                 connman_error("Group not set; cannot enable VPN");
 277                 return -EINVAL;
 278         }
 279
 280         connman_task_add_argument(task, "--non-inter", NULL);
 281         connman_task_add_argument(task, "--no-detach", NULL);
 282
 283         connman_task_add_argument(task, "--ifname", if_name);
 284         connman_task_add_argument(task, "--ifmode", "tun");
 285
 286         connman_task_add_argument(task, "--script",
 287                                 SCRIPTDIR "/openconnect-script");
 288
 289         option = connman_provider_get_string(provider, "VPNC.Debug");
 290         if (option != NULL)
 291                 connman_task_add_argument(task, "--debug", option);
 292
 293         connman_task_add_argument(task, "-", NULL);
 294
 295         err = connman_task_run(task, vpn_died, provider,
 296                                 &fd, NULL, NULL);
 297         if (err < 0) {
 298                 connman_error("vpnc failed to start");
 299                 return -EIO;
 300         }
 301
 302         err = vc_write_config_data(provider, fd);
 303
 304         close(fd);
 305
 306         return err;
 307 }
 308
 309 static int vc_error_code(int exit_code)
 310 {
 311         switch (exit_code) {
 312         case 1:
 313                 return CONNMAN_PROVIDER_ERROR_CONNECT_FAILED;
 314         case 2:
 315                 return CONNMAN_PROVIDER_ERROR_LOGIN_FAILED;
 316         default:
 317                 return CONNMAN_PROVIDER_ERROR_UNKNOWN;
 318         }
 319 }
 320
 321 static struct vpn_driver vpn_driver = {
 322         .notify         = vc_notify,
 323         .connect        = vc_connect,
 324         .error_code     = vc_error_code,
 325         .save           = vc_save,
 326 };
 327
 328 static int vpnc_init(void)
 329 {
 330         connection = connman_dbus_get_connection();
 331
 332         return vpn_register("vpnc", &vpn_driver, VPNC);
 333 }
 334
 335 static void vpnc_exit(void)
 336 {
 337         vpn_unregister("vpnc");
 338
 339         dbus_connection_unref(connection);
 340 }
 341
 342 CONNMAN_PLUGIN_DEFINE(vpnc, "vpnc plugin", VERSION,
 343         CONNMAN_PLUGIN_PRIORITY_DEFAULT, vpnc_init, vpnc_exit)