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