vpn/main.c

   1 /*
   2  *
   3  *  ConnMan VPN daemon
   4  *
   5  *  Copyright (C) 2012-2013  Intel Corporation. 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 <errno.h>
  27 #include <stdio.h>
  28 #include <stdlib.h>
  29 #include <unistd.h>
  30 #include <string.h>
  31 #include <signal.h>
  32 #include <sys/signalfd.h>
  33 #include <getopt.h>
  34 #include <sys/stat.h>
  35 #include <net/if.h>
  36 #include <netdb.h>
  37
  38 #include <gdbus.h>
  39
  40 #include "../src/connman.h"
  41 #include "vpn.h"
  42
  43 #include "connman/vpn-dbus.h"
  44
  45 #define CONFIGMAINFILE CONFIGDIR "/connman-vpn.conf"
  46
  47 #define DEFAULT_INPUT_REQUEST_TIMEOUT 300 * 1000
  48
  49 static GMainLoop *main_loop = NULL;
  50
  51 static unsigned int __terminated = 0;
  52
  53 static struct {
  54         unsigned int timeout_inputreq;
  55 } connman_vpn_settings  = {
  56         .timeout_inputreq = DEFAULT_INPUT_REQUEST_TIMEOUT,
  57 };
  58
  59 static GKeyFile *load_config(const char *file)
  60 {
  61         GError *err = NULL;
  62         GKeyFile *keyfile;
  63
  64         keyfile = g_key_file_new();
  65
  66         g_key_file_set_list_separator(keyfile, ',');
  67
  68         if (!g_key_file_load_from_file(keyfile, file, 0, &err)) {
  69                 if (err->code != G_FILE_ERROR_NOENT) {
  70                         connman_error("Parsing %s failed: %s", file,
  71                                                                 err->message);
  72                 }
  73
  74                 g_error_free(err);
  75                 g_key_file_free(keyfile);
  76                 return NULL;
  77         }
  78
  79         return keyfile;
  80 }
  81
  82 static void parse_config(GKeyFile *config, const char *file)
  83 {
  84         GError *error = NULL;
  85         int timeout;
  86
  87         if (!config)
  88                 return;
  89
  90         DBG("parsing %s", file);
  91
  92         timeout = g_key_file_get_integer(config, "General",
  93                         "InputRequestTimeout", &error);
  94         if (!error && timeout >= 0)
  95                 connman_vpn_settings.timeout_inputreq = timeout * 1000;
  96
  97         g_clear_error(&error);
  98 }
  99
 100 static int config_init(const char *file)
 101 {
 102         GKeyFile *config;
 103
 104         config = load_config(file);
 105         parse_config(config, file);
 106         if (config)
 107                 g_key_file_free(config);
 108
 109         return 0;
 110 }
 111
 112 static gboolean signal_handler(GIOChannel *channel, GIOCondition cond,
 113                                                         gpointer user_data)
 114 {
 115         struct signalfd_siginfo si;
 116         ssize_t result;
 117         int fd;
 118
 119         if (cond & (G_IO_NVAL | G_IO_ERR | G_IO_HUP))
 120                 return FALSE;
 121
 122         fd = g_io_channel_unix_get_fd(channel);
 123
 124         result = read(fd, &si, sizeof(si));
 125         if (result != sizeof(si))
 126                 return FALSE;
 127
 128         switch (si.ssi_signo) {
 129         case SIGINT:
 130         case SIGTERM:
 131                 if (__terminated == 0) {
 132                         connman_info("Terminating");
 133                         g_main_loop_quit(main_loop);
 134                 }
 135
 136                 __terminated = 1;
 137                 break;
 138         }
 139
 140         return TRUE;
 141 }
 142
 143 static guint setup_signalfd(void)
 144 {
 145         GIOChannel *channel;
 146         guint source;
 147         sigset_t mask;
 148         int fd;
 149
 150         sigemptyset(&mask);
 151         sigaddset(&mask, SIGINT);
 152         sigaddset(&mask, SIGTERM);
 153
 154         if (sigprocmask(SIG_BLOCK, &mask, NULL) < 0) {
 155                 perror("Failed to set signal mask");
 156                 return 0;
 157         }
 158
 159         fd = signalfd(-1, &mask, 0);
 160         if (fd < 0) {
 161                 perror("Failed to create signal descriptor");
 162                 return 0;
 163         }
 164
 165         channel = g_io_channel_unix_new(fd);
 166
 167         g_io_channel_set_close_on_unref(channel, TRUE);
 168         g_io_channel_set_encoding(channel, NULL, NULL);
 169         g_io_channel_set_buffered(channel, FALSE);
 170
 171         source = g_io_add_watch(channel,
 172                                 G_IO_IN | G_IO_HUP | G_IO_ERR | G_IO_NVAL,
 173                                 signal_handler, NULL);
 174
 175         g_io_channel_unref(channel);
 176
 177         return source;
 178 }
 179
 180 static void disconnect_callback(DBusConnection *conn, void *user_data)
 181 {
 182         connman_error("D-Bus disconnect");
 183
 184         g_main_loop_quit(main_loop);
 185 }
 186
 187 static gchar *option_config = NULL;
 188 static gchar *option_debug = NULL;
 189 static gchar *option_plugin = NULL;
 190 static gchar *option_noplugin = NULL;
 191 static bool option_detach = true;
 192 static bool option_version = false;
 193 static bool option_routes = false;
 194
 195 static bool parse_debug(const char *key, const char *value,
 196                                         gpointer user_data, GError **error)
 197 {
 198         if (value)
 199                 option_debug = g_strdup(value);
 200         else
 201                 option_debug = g_strdup("*");
 202
 203         return true;
 204 }
 205
 206 static GOptionEntry options[] = {
 207         { "config", 'c', 0, G_OPTION_ARG_STRING, &option_config,
 208                                 "Load the specified configuration file "
 209                                 "instead of " CONFIGMAINFILE, "FILE" },
 210         { "debug", 'd', G_OPTION_FLAG_OPTIONAL_ARG,
 211                                 G_OPTION_ARG_CALLBACK, parse_debug,
 212                                 "Specify debug options to enable", "DEBUG" },
 213         { "plugin", 'p', 0, G_OPTION_ARG_STRING, &option_plugin,
 214                                 "Specify plugins to load", "NAME,..." },
 215         { "noplugin", 'P', 0, G_OPTION_ARG_STRING, &option_noplugin,
 216                                 "Specify plugins not to load", "NAME,..." },
 217         { "nodaemon", 'n', G_OPTION_FLAG_REVERSE,
 218                                 G_OPTION_ARG_NONE, &option_detach,
 219                                 "Don't fork daemon to background" },
 220         { "routes", 'r', 0, G_OPTION_ARG_NONE, &option_routes,
 221                                 "Create/delete VPN routes" },
 222         { "version", 'v', 0, G_OPTION_ARG_NONE, &option_version,
 223                                 "Show version information and exit" },
 224         { NULL },
 225 };
 226
 227 /*
 228  * This function will be called from generic src/agent.c code so we have
 229  * to use connman_ prefix instead of vpn_ one.
 230  */
 231 unsigned int connman_timeout_input_request(void)
 232 {
 233         return connman_vpn_settings.timeout_inputreq;
 234 }
 235
 236 int main(int argc, char *argv[])
 237 {
 238         GOptionContext *context;
 239         GError *error = NULL;
 240         DBusConnection *conn;
 241         DBusError err;
 242         guint signal;
 243
 244         context = g_option_context_new(NULL);
 245         g_option_context_add_main_entries(context, options, NULL);
 246
 247         if (!g_option_context_parse(context, &argc, &argv, &error)) {
 248                 if (error) {
 249                         g_printerr("%s\n", error->message);
 250                         g_error_free(error);
 251                 } else
 252                         g_printerr("An unknown error occurred\n");
 253                 exit(1);
 254         }
 255
 256         g_option_context_free(context);
 257
 258         if (option_version) {
 259                 printf("%s\n", VERSION);
 260                 exit(0);
 261         }
 262
 263         if (option_detach) {
 264                 if (daemon(0, 0)) {
 265                         perror("Can't start daemon");
 266                         exit(1);
 267                 }
 268         }
 269
 270         if (mkdir(VPN_STATEDIR, S_IRUSR | S_IWUSR | S_IXUSR |
 271                                 S_IRGRP | S_IXGRP | S_IROTH | S_IXOTH) < 0) {
 272                 if (errno != EEXIST)
 273                         perror("Failed to create state directory");
 274         }
 275
 276         /*
 277          * At some point the VPN stuff is migrated into VPN_STORAGEDIR
 278          * and this mkdir() call can be removed.
 279          */
 280         if (mkdir(STORAGEDIR, S_IRUSR | S_IWUSR | S_IXUSR |
 281                                 S_IRGRP | S_IXGRP | S_IROTH | S_IXOTH) < 0) {
 282                 if (errno != EEXIST)
 283                         perror("Failed to create storage directory");
 284         }
 285
 286         if (mkdir(VPN_STORAGEDIR, S_IRUSR | S_IWUSR | S_IXUSR |
 287                                 S_IRGRP | S_IXGRP | S_IROTH | S_IXOTH) < 0) {
 288                 if (errno != EEXIST)
 289                         perror("Failed to create VPN storage directory");
 290         }
 291
 292         umask(0077);
 293
 294         main_loop = g_main_loop_new(NULL, FALSE);
 295
 296         signal = setup_signalfd();
 297
 298         dbus_error_init(&err);
 299
 300         conn = g_dbus_setup_bus(DBUS_BUS_SYSTEM, VPN_SERVICE, &err);
 301         if (!conn) {
 302                 if (dbus_error_is_set(&err)) {
 303                         fprintf(stderr, "%s\n", err.message);
 304                         dbus_error_free(&err);
 305                 } else
 306                         fprintf(stderr, "Can't register with system bus\n");
 307                 exit(1);
 308         }
 309
 310         g_dbus_set_disconnect_function(conn, disconnect_callback, NULL, NULL);
 311
 312         __connman_log_init(argv[0], option_debug, option_detach, false,
 313                         "Connection Manager VPN daemon", VERSION);
 314         __connman_dbus_init(conn);
 315
 316         if (!option_config)
 317                 config_init(CONFIGMAINFILE);
 318         else
 319                 config_init(option_config);
 320
 321         __connman_inotify_init();
 322         __connman_agent_init();
 323         __vpn_provider_init(option_routes);
 324         __vpn_manager_init();
 325         __vpn_ipconfig_init();
 326         __vpn_rtnl_init();
 327         __connman_task_init();
 328         __connman_plugin_init(option_plugin, option_noplugin);
 329         __vpn_config_init();
 330
 331         __vpn_rtnl_start();
 332
 333         g_free(option_plugin);
 334         g_free(option_noplugin);
 335
 336         g_main_loop_run(main_loop);
 337
 338         g_source_remove(signal);
 339
 340         __vpn_config_cleanup();
 341         __connman_plugin_cleanup();
 342         __connman_task_cleanup();
 343         __vpn_rtnl_cleanup();
 344         __vpn_ipconfig_cleanup();
 345         __vpn_manager_cleanup();
 346         __vpn_provider_cleanup();
 347         __connman_agent_cleanup();
 348         __connman_inotify_cleanup();
 349         __connman_dbus_cleanup();
 350         __connman_log_cleanup(false);
 351
 352         dbus_connection_unref(conn);
 353
 354         g_main_loop_unref(main_loop);
 355
 356         g_free(option_debug);
 357
 358         return 0;
 359 }