src/charon/daemon.c

   1 /**
   2  * @file daemon.c
   3  *
   4  * @brief Implementation of daemon_t and main of IKEv2-Daemon.
   5  *
   6  */
   7
   8 /*
   9  * Copyright (C) 2006 Tobias Brunner, Daniel Roethlisberger
  10  * Copyright (C) 2005-2006 Martin Willi
  11  * Copyright (C) 2005 Jan Hutter
  12  * Hochschule fuer Technik Rapperswil
  13  *
  14  * This program is free software; you can redistribute it and/or modify it
  15  * under the terms of the GNU General Public License as published by the
  16  * Free Software Foundation; either version 2 of the License, or (at your
  17  * option) any later version.  See <http://www.fsf.org/copyleft/gpl.txt>.
  18  *
  19  * This program is distributed in the hope that it will be useful, but
  20  * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
  21  * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  22  * for more details.
  23  */
  24
  25 #include <stdio.h>
  26 #include <signal.h>
  27 #include <pthread.h>
  28 #include <sys/stat.h>
  29 #include <sys/types.h>
  30 #include <unistd.h>
  31 #include <time.h>
  32 #include <execinfo.h>
  33 #include <string.h>
  34 #include <getopt.h>
  35 #include <errno.h>
  36
  37 #include "daemon.h"
  38
  39 #include <library.h>
  40 #include <config/credentials/local_credential_store.h>
  41 #include <config/connections/local_connection_store.h>
  42 #include <config/policies/local_policy_store.h>
  43
  44
  45 typedef struct private_daemon_t private_daemon_t;
  46
  47 /**
  48  * Private additions to daemon_t, contains threads and internal functions.
  49  */
  50 struct private_daemon_t {
  51         /**
  52          * Public members of daemon_t.
  53          */
  54         daemon_t public;
  55
  56         /**
  57          * Signal set used for signal handling.
  58          */
  59         sigset_t signal_set;
  60
  61         /**
  62          * The thread_id of main-thread.
  63          */
  64         pthread_t main_thread_id;
  65 };
  66
  67 /**
  68  * One and only instance of the daemon.
  69  */
  70 daemon_t *charon;
  71
  72 /**
  73  * hook in library for debugging messages
  74  */
  75 extern void (*dbg) (int level, char *fmt, ...);
  76
  77 /**
  78  * Logging hook for library logs, spreads debug message over bus
  79  */
  80 static void dbg_bus(int level, char *fmt, ...)
  81 {
  82         va_list args;
  83
  84         va_start(args, fmt);
  85         charon->bus->vsignal(charon->bus, DBG_LIB, level, fmt, args);
  86         va_end(args);
  87 }
  88
  89 /**
  90  * Logging hook for library logs, using stderr output
  91  */
  92 static void dbg_stderr(int level, char *fmt, ...)
  93 {
  94         va_list args;
  95
  96         va_start(args, fmt);
  97         fprintf(stderr, "00[LIB] ");
  98         vfprintf(stderr, fmt, args);
  99         fprintf(stderr, "\n");
 100         va_end(args);
 101 }
 102
 103 /**
 104  * Run the daemon and handle unix signals
 105  */
 106 static void run(private_daemon_t *this)
 107 {
 108         /* reselect signals for this thread */
 109         sigemptyset(&(this->signal_set));
 110         sigaddset(&(this->signal_set), SIGINT);
 111         sigaddset(&(this->signal_set), SIGHUP);
 112         sigaddset(&(this->signal_set), SIGTERM);
 113         pthread_sigmask(SIG_BLOCK, &(this->signal_set), 0);
 114
 115         while(TRUE)
 116         {
 117                 int signal_number;
 118                 int error;
 119
 120                 error = sigwait(&(this->signal_set), &signal_number);
 121                 if(error)
 122                 {
 123                         DBG1(DBG_DMN, "error %d while waiting for a signal", error);
 124                         return;
 125                 }
 126                 switch (signal_number)
 127                 {
 128                         case SIGHUP:
 129                         {
 130                                 DBG1(DBG_DMN, "signal of type SIGHUP received. Ignored");
 131                                 break;
 132                         }
 133                         case SIGINT:
 134                         {
 135                                 DBG1(DBG_DMN, "signal of type SIGINT received. Shutting down");
 136                                 return;
 137                         }
 138                         case SIGTERM:
 139                                 DBG1(DBG_DMN, "signal of type SIGTERM received. Shutting down");
 140                                 return;
 141                         default:
 142                         {
 143                                 DBG1(DBG_DMN, "unknown signal %d received. Ignored", signal_number);
 144                                 break;
 145                         }
 146                 }
 147         }
 148 }
 149
 150 /**
 151  * Clean up all daemon resources
 152  */
 153 static void destroy(private_daemon_t *this)
 154 {
 155         /* destruction is a non trivial task, we need to follow
 156         * a strict order to prevent threading issues!
 157         * Kill active threads first, except the sender, as
 158         * the killed IKE_SA want to send delete messages.
 159         */
 160         /* we don't want to receive anything anymore... */
 161         DESTROY_IF(this->public.receiver);
 162         /* ignore all incoming user requests */
 163         DESTROY_IF(this->public.stroke);
 164         /* stop scheduing jobs */
 165         DESTROY_IF(this->public.scheduler);
 166         /* stop processing jobs */
 167         DESTROY_IF(this->public.thread_pool);
 168         /* shut down manager with all IKE SAs */
 169         DESTROY_IF(this->public.ike_sa_manager);
 170         /* all child SAs should be down now, so kill kernel interface */
 171         DESTROY_IF(this->public.kernel_interface);
 172         /* destroy other infrastructure */
 173         DESTROY_IF(this->public.job_queue);
 174         DESTROY_IF(this->public.event_queue);
 175         DESTROY_IF(this->public.configuration);
 176         DESTROY_IF(this->public.credentials);
 177         DESTROY_IF(this->public.connections);
 178         DESTROY_IF(this->public.policies);
 179         sched_yield();
 180         /* we hope the sender could send the outstanding deletes, but
 181          * we shut down here at any cost */
 182         DESTROY_IF(this->public.sender);
 183         DESTROY_IF(this->public.send_queue);
 184         DESTROY_IF(this->public.socket);
 185         /* before destroying bus with its listeners, rehook library logs */
 186         dbg = dbg_stderr;
 187         DESTROY_IF(this->public.bus);
 188         DESTROY_IF(this->public.outlog);
 189         DESTROY_IF(this->public.syslog);
 190         DESTROY_IF(this->public.authlog);
 191         free(this);
 192 }
 193
 194 /**
 195  * Enforce daemon shutdown, with a given reason to do so.
 196  */
 197 static void kill_daemon(private_daemon_t *this, char *reason)
 198 {
 199         /* we send SIGTERM, so the daemon can cleanly shut down */
 200         DBG1(DBG_DMN, "killing daemon: %s", reason);
 201         if (this->main_thread_id == pthread_self())
 202         {
 203                 /* initialization failed, terminate daemon */
 204                 destroy(this);
 205                 unlink(PID_FILE);
 206                 exit(-1);
 207         }
 208         else
 209         {
 210                 DBG1(DBG_DMN, "sending SIGTERM to ourself");
 211                 raise(SIGTERM);
 212                 /* thread must die, since he produced a ciritcal failure and can't continue */
 213                 pthread_exit(NULL);
 214         }
 215 }
 216
 217 /**
 218  * Initialize the daemon, optional with a strict crl policy
 219  */
 220 static void initialize(private_daemon_t *this, bool strict, bool syslog,
 221                                            level_t levels[])
 222 {
 223         credential_store_t* credentials;
 224         signal_t signal;
 225
 226         /* for uncritical pseudo random numbers */
 227         srandom(time(NULL) + getpid());
 228
 229         /* setup bus and it's listeners first to enable log output */
 230         this->public.bus = bus_create();
 231         this->public.outlog = file_logger_create(stdout);
 232         this->public.syslog = sys_logger_create(LOG_DAEMON);
 233         this->public.authlog = sys_logger_create(LOG_AUTHPRIV);
 234         this->public.bus->add_listener(this->public.bus, &this->public.syslog->listener);
 235         this->public.bus->add_listener(this->public.bus, &this->public.outlog->listener);
 236         this->public.bus->add_listener(this->public.bus, &this->public.authlog->listener);
 237         this->public.authlog->set_level(this->public.authlog, SIG_ANY, LEVEL_AUDIT);
 238         /* set up hook to log dbg message in library via charons message bus */
 239         dbg = dbg_bus;
 240
 241         /* apply loglevels */
 242         for (signal = 0; signal < DBG_MAX; signal++)
 243         {
 244                 if (syslog)
 245                 {
 246                         this->public.syslog->set_level(this->public.syslog,
 247                                                                                    signal, levels[signal]);
 248                 }
 249                 else
 250                 {
 251                         this->public.outlog->set_level(this->public.outlog,
 252                                                                                    signal, levels[signal]);
 253                 }
 254         }
 255
 256         DBG1(DBG_DMN, "starting charon (strongSwan Version %s)", VERSION);
 257
 258         this->public.configuration = configuration_create();
 259         this->public.socket = socket_create(IKEV2_UDP_PORT, IKEV2_NATT_PORT);
 260         this->public.ike_sa_manager = ike_sa_manager_create();
 261         this->public.job_queue = job_queue_create();
 262         this->public.event_queue = event_queue_create();
 263         this->public.send_queue = send_queue_create();
 264         this->public.connections = (connection_store_t*)local_connection_store_create();
 265         this->public.policies = (policy_store_t*)local_policy_store_create();
 266         this->public.credentials = (credential_store_t*)local_credential_store_create(strict);
 267
 268         /* load secrets, ca certificates and crls */
 269         credentials = this->public.credentials;
 270         credentials->load_ca_certificates(credentials);
 271         credentials->load_crls(credentials);
 272         credentials->load_secrets(credentials);
 273
 274         /* start building threads, we are multi-threaded NOW */
 275         this->public.stroke = stroke_create();
 276         this->public.sender = sender_create();
 277         this->public.receiver = receiver_create();
 278         this->public.scheduler = scheduler_create();
 279         this->public.kernel_interface = kernel_interface_create();
 280         this->public.thread_pool = thread_pool_create(NUMBER_OF_WORKING_THREADS);
 281 }
 282
 283 /**
 284  * Handle SIGSEGV/SIGILL signals raised by threads
 285  */
 286 void signal_handler(int signal)
 287 {
 288         void *array[20];
 289         size_t size;
 290         char **strings;
 291         size_t i;
 292
 293         size = backtrace(array, 20);
 294         strings = backtrace_symbols(array, size);
 295
 296         DBG1(DBG_DMN, "thread %u received %s. Dumping %d frames from stack:",
 297                  signal == SIGSEGV ? "SIGSEGV" : "SIGILL", pthread_self(), size);
 298
 299         for (i = 0; i < size; i++)
 300         {
 301                 DBG1(DBG_DMN, "    %s", strings[i]);
 302         }
 303         free (strings);
 304         DBG1(DBG_DMN, "killing ourself hard after SIGSEGV");
 305         raise(SIGKILL);
 306 }
 307
 308 /**
 309  * Create the daemon.
 310  */
 311 private_daemon_t *daemon_create(void)
 312 {
 313         private_daemon_t *this = malloc_thing(private_daemon_t);
 314         struct sigaction action;
 315
 316         /* assign methods */
 317         this->public.kill = (void (*) (daemon_t*,char*))kill_daemon;
 318
 319         /* NULL members for clean destruction */
 320         this->public.socket = NULL;
 321         this->public.ike_sa_manager = NULL;
 322         this->public.job_queue = NULL;
 323         this->public.event_queue = NULL;
 324         this->public.send_queue = NULL;
 325         this->public.configuration = NULL;
 326         this->public.credentials = NULL;
 327         this->public.connections = NULL;
 328         this->public.policies = NULL;
 329         this->public.sender= NULL;
 330         this->public.receiver = NULL;
 331         this->public.scheduler = NULL;
 332         this->public.kernel_interface = NULL;
 333         this->public.thread_pool = NULL;
 334         this->public.stroke = NULL;
 335         this->public.bus = NULL;
 336         this->public.outlog = NULL;
 337         this->public.syslog = NULL;
 338         this->public.authlog = NULL;
 339
 340         this->main_thread_id = pthread_self();
 341
 342         /* setup signal handling for all threads */
 343         sigemptyset(&(this->signal_set));
 344         sigaddset(&(this->signal_set), SIGSEGV);
 345         sigaddset(&(this->signal_set), SIGINT);
 346         sigaddset(&(this->signal_set), SIGHUP);
 347         sigaddset(&(this->signal_set), SIGTERM);
 348         pthread_sigmask(SIG_BLOCK, &(this->signal_set), 0);
 349
 350         /* setup SIGSEGV handler for all threads */
 351         action.sa_handler = signal_handler;
 352         action.sa_mask = this->signal_set;
 353         action.sa_flags = 0;
 354         sigaction(SIGSEGV, &action, NULL);
 355         sigaction(SIGILL, &action, NULL);
 356         return this;
 357 }
 358
 359 /**
 360  * print command line usage and exit
 361  */
 362 static void usage(const char *msg)
 363 {
 364         if (msg != NULL && *msg != '\0')
 365         {
 366                 fprintf(stderr, "%s\n", msg);
 367         }
 368         fprintf(stderr, "Usage: charon\n"
 369                                         "         [--help]\n"
 370                                         "         [--version]\n"
 371                                         "         [--strictcrlpolicy]\n"
 372                                         "         [--use-syslog]\n"
 373                                         "         [--debug-<type> <level>]\n"
 374                                         "           <type>:  log context type (dmn|mgr|ike|chd|job|cfg|knl|net|enc|lib)\n"
 375                                         "           <level>: log verbosity (-1 = silent, 0 = audit, 1 = control,\n"
 376                                         "                                    2 = controlmore, 3 = raw, 4 = private)\n"
 377                                         "\n"
 378                    );
 379         exit(msg == NULL? 0 : 1);
 380 }
 381
 382 /**
 383  * Main function, manages the daemon.
 384  */
 385 int main(int argc, char *argv[])
 386 {
 387         bool strict_crl_policy = FALSE;
 388         bool use_syslog = FALSE;
 389
 390         private_daemon_t *private_charon;
 391         FILE *pid_file;
 392         struct stat stb;
 393         linked_list_t *list;
 394         host_t *host;
 395         level_t levels[DBG_MAX];
 396         int signal;
 397
 398         /* use CTRL loglevel for default */
 399         for (signal = 0; signal < DBG_MAX; signal++)
 400         {
 401                 levels[signal] = LEVEL_CTRL;
 402         }
 403
 404         /* handle arguments */
 405         for (;;)
 406         {
 407                 struct option long_opts[] = {
 408                         { "help", no_argument, NULL, 'h' },
 409                         { "version", no_argument, NULL, 'v' },
 410                         { "use-syslog", no_argument, NULL, 'l' },
 411                         { "strictcrlpolicy", no_argument, NULL, 'r' },
 412                         /* TODO: handle "debug-all" */
 413                         { "debug-dmn", required_argument, &signal, DBG_DMN },
 414                         { "debug-mgr", required_argument, &signal, DBG_MGR },
 415                         { "debug-ike", required_argument, &signal, DBG_IKE },
 416                         { "debug-chd", required_argument, &signal, DBG_CHD },
 417                         { "debug-job", required_argument, &signal, DBG_JOB },
 418                         { "debug-cfg", required_argument, &signal, DBG_CFG },
 419                         { "debug-knl", required_argument, &signal, DBG_KNL },
 420                         { "debug-net", required_argument, &signal, DBG_NET },
 421                         { "debug-enc", required_argument, &signal, DBG_ENC },
 422                         { "debug-lib", required_argument, &signal, DBG_LIB },
 423                         { 0,0,0,0 }
 424                 };
 425
 426                 int c = getopt_long(argc, argv, "", long_opts, NULL);
 427                 switch (c)
 428                 {
 429                         case EOF:
 430                         break;
 431                         case 'h':
 432                                 usage(NULL);
 433                                 break;
 434                         case 'v':
 435                                 printf("Linux strongSwan %s\n", VERSION);
 436                                 exit(0);
 437                         case 'l':
 438                                 use_syslog = TRUE;
 439                                 continue;
 440                         case 'r':
 441                                 strict_crl_policy = TRUE;
 442                                 continue;
 443                         case 0:
 444                                 /* option is in signal */
 445                                 levels[signal] = atoi(optarg);
 446                                 continue;
 447                         default:
 448                                 usage("");
 449                                 break;
 450                 }
 451                 break;
 452         }
 453
 454         private_charon = daemon_create();
 455         charon = (daemon_t*)private_charon;
 456
 457         /* initialize daemon */
 458         initialize(private_charon, strict_crl_policy, use_syslog, levels);
 459
 460         /* check/setup PID file */
 461         if (stat(PID_FILE, &stb) == 0)
 462         {
 463                 DBG1(DBG_DMN, "charon already running (\""PID_FILE"\" exists)");
 464                 destroy(private_charon);
 465                 exit(-1);
 466         }
 467         pid_file = fopen(PID_FILE, "w");
 468         if (pid_file)
 469         {
 470                 fprintf(pid_file, "%d\n", getpid());
 471                 fclose(pid_file);
 472         }
 473         /* log socket info */
 474         list = charon->socket->create_local_address_list(charon->socket);
 475         DBG1(DBG_NET, "listening on %d addresses:", list->get_count(list));
 476         while (list->remove_first(list, (void**)&host) == SUCCESS)
 477         {
 478                 DBG1(DBG_NET, "  %H", host);
 479                 host->destroy(host);
 480         }
 481         list->destroy(list);
 482
 483         /* run daemon */
 484         run(private_charon);
 485
 486         /* normal termination, cleanup and exit */
 487         destroy(private_charon);
 488         unlink(PID_FILE);
 489
 490         return 0;
 491 }