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 <string.h>
  33 #include <getopt.h>
  34 #include <errno.h>
  35 #ifdef HAVE_BACKTRACE
  36 # include <execinfo.h>
  37 #endif /* HAVE_BACKTRACE */
  38
  39 #include "daemon.h"
  40
  41 #include <library.h>
  42 #include <config/credentials/local_credential_store.h>
  43 #include <config/connections/local_connection_store.h>
  44 #include <config/policies/local_policy_store.h>
  45
  46
  47 typedef struct private_daemon_t private_daemon_t;
  48
  49 /**
  50  * Private additions to daemon_t, contains threads and internal functions.
  51  */
  52 struct private_daemon_t {
  53         /**
  54          * Public members of daemon_t.
  55          */
  56         daemon_t public;
  57
  58         /**
  59          * Signal set used for signal handling.
  60          */
  61         sigset_t signal_set;
  62
  63         /**
  64          * The thread_id of main-thread.
  65          */
  66         pthread_t main_thread_id;
  67 };
  68
  69 /**
  70  * One and only instance of the daemon.
  71  */
  72 daemon_t *charon;
  73
  74 /**
  75  * hook in library for debugging messages
  76  */
  77 extern void (*dbg) (int level, char *fmt, ...);
  78
  79 /**
  80  * Logging hook for library logs, spreads debug message over bus
  81  */
  82 static void dbg_bus(int level, char *fmt, ...)
  83 {
  84         va_list args;
  85
  86         va_start(args, fmt);
  87         charon->bus->vsignal(charon->bus, DBG_LIB, level, fmt, args);
  88         va_end(args);
  89 }
  90
  91 /**
  92  * Logging hook for library logs, using stderr output
  93  */
  94 static void dbg_stderr(int level, char *fmt, ...)
  95 {
  96         va_list args;
  97
  98         va_start(args, fmt);
  99         fprintf(stderr, "00[LIB] ");
 100         vfprintf(stderr, fmt, args);
 101         fprintf(stderr, "\n");
 102         va_end(args);
 103 }
 104
 105 /**
 106  * Run the daemon and handle unix signals
 107  */
 108 static void run(private_daemon_t *this)
 109 {
 110         /* reselect signals for this thread */
 111         sigemptyset(&(this->signal_set));
 112         sigaddset(&(this->signal_set), SIGINT);
 113         sigaddset(&(this->signal_set), SIGHUP);
 114         sigaddset(&(this->signal_set), SIGTERM);
 115         pthread_sigmask(SIG_BLOCK, &(this->signal_set), 0);
 116
 117         while(TRUE)
 118         {
 119                 int signal_number;
 120                 int error;
 121
 122                 error = sigwait(&(this->signal_set), &signal_number);
 123                 if(error)
 124                 {
 125                         DBG1(DBG_DMN, "error %d while waiting for a signal", error);
 126                         return;
 127                 }
 128                 switch (signal_number)
 129                 {
 130                         case SIGHUP:
 131                         {
 132                                 DBG1(DBG_DMN, "signal of type SIGHUP received. Ignored");
 133                                 break;
 134                         }
 135                         case SIGINT:
 136                         {
 137                                 DBG1(DBG_DMN, "signal of type SIGINT received. Shutting down");
 138                                 return;
 139                         }
 140                         case SIGTERM:
 141                                 DBG1(DBG_DMN, "signal of type SIGTERM received. Shutting down");
 142                                 return;
 143                         default:
 144                         {
 145                                 DBG1(DBG_DMN, "unknown signal %d received. Ignored", signal_number);
 146                                 break;
 147                         }
 148                 }
 149         }
 150 }
 151
 152 /**
 153  * Clean up all daemon resources
 154  */
 155 static void destroy(private_daemon_t *this)
 156 {
 157         /* destruction is a non trivial task, we need to follow
 158         * a strict order to prevent threading issues!
 159         * Kill active threads first, except the sender, as
 160         * the killed IKE_SA want to send delete messages.
 161         */
 162         /* we don't want to receive anything anymore... */
 163         DESTROY_IF(this->public.receiver);
 164         /* ignore all incoming user requests */
 165         DESTROY_IF(this->public.stroke);
 166         /* stop scheduing jobs */
 167         DESTROY_IF(this->public.scheduler);
 168         /* stop processing jobs */
 169         DESTROY_IF(this->public.thread_pool);
 170         /* shut down manager with all IKE SAs */
 171         DESTROY_IF(this->public.ike_sa_manager);
 172         /* all child SAs should be down now, so kill kernel interface */
 173         DESTROY_IF(this->public.kernel_interface);
 174         /* destroy other infrastructure */
 175         DESTROY_IF(this->public.job_queue);
 176         DESTROY_IF(this->public.event_queue);
 177         DESTROY_IF(this->public.configuration);
 178         DESTROY_IF(this->public.credentials);
 179         DESTROY_IF(this->public.connections);
 180         DESTROY_IF(this->public.policies);
 181         sched_yield();
 182         /* we hope the sender could send the outstanding deletes, but
 183          * we shut down here at any cost */
 184         DESTROY_IF(this->public.sender);
 185         DESTROY_IF(this->public.send_queue);
 186         DESTROY_IF(this->public.socket);
 187         /* before destroying bus with its listeners, rehook library logs */
 188         dbg = dbg_stderr;
 189         DESTROY_IF(this->public.bus);
 190         DESTROY_IF(this->public.outlog);
 191         DESTROY_IF(this->public.syslog);
 192         DESTROY_IF(this->public.authlog);
 193         free(this);
 194 }
 195
 196 /**
 197  * Enforce daemon shutdown, with a given reason to do so.
 198  */
 199 static void kill_daemon(private_daemon_t *this, char *reason)
 200 {
 201         /* we send SIGTERM, so the daemon can cleanly shut down */
 202         DBG1(DBG_DMN, "killing daemon: %s", reason);
 203         if (this->main_thread_id == pthread_self())
 204         {
 205                 /* initialization failed, terminate daemon */
 206                 destroy(this);
 207                 unlink(PID_FILE);
 208                 exit(-1);
 209         }
 210         else
 211         {
 212                 DBG1(DBG_DMN, "sending SIGTERM to ourself");
 213                 raise(SIGTERM);
 214                 /* thread must die, since he produced a ciritcal failure and can't continue */
 215                 pthread_exit(NULL);
 216         }
 217 }
 218
 219 /**
 220  * Initialize the daemon, optional with a strict crl policy
 221  */
 222 static void initialize(private_daemon_t *this, bool strict, bool syslog,
 223                                            level_t levels[])
 224 {
 225         credential_store_t* credentials;
 226         signal_t signal;
 227
 228         /* for uncritical pseudo random numbers */
 229         srandom(time(NULL) + getpid());
 230
 231         /* setup bus and it's listeners first to enable log output */
 232         this->public.bus = bus_create();
 233         this->public.outlog = file_logger_create(stdout);
 234         this->public.syslog = sys_logger_create(LOG_DAEMON);
 235         this->public.authlog = sys_logger_create(LOG_AUTHPRIV);
 236         this->public.bus->add_listener(this->public.bus, &this->public.syslog->listener);
 237         this->public.bus->add_listener(this->public.bus, &this->public.outlog->listener);
 238         this->public.bus->add_listener(this->public.bus, &this->public.authlog->listener);
 239         this->public.authlog->set_level(this->public.authlog, SIG_ANY, LEVEL_AUDIT);
 240         /* set up hook to log dbg message in library via charons message bus */
 241         dbg = dbg_bus;
 242
 243         /* apply loglevels */
 244         for (signal = 0; signal < DBG_MAX; signal++)
 245         {
 246                 if (syslog)
 247                 {
 248                         this->public.syslog->set_level(this->public.syslog,
 249                                                                                    signal, levels[signal]);
 250                 }
 251                 else
 252                 {
 253                         this->public.outlog->set_level(this->public.outlog,
 254                                                                                    signal, levels[signal]);
 255                 }
 256         }
 257
 258         DBG1(DBG_DMN, "starting charon (strongSwan Version %s)", VERSION);
 259
 260         this->public.configuration = configuration_create();
 261         this->public.socket = socket_create(IKEV2_UDP_PORT, IKEV2_NATT_PORT);
 262         this->public.ike_sa_manager = ike_sa_manager_create();
 263         this->public.job_queue = job_queue_create();
 264         this->public.event_queue = event_queue_create();
 265         this->public.send_queue = send_queue_create();
 266         this->public.connections = (connection_store_t*)local_connection_store_create();
 267         this->public.policies = (policy_store_t*)local_policy_store_create();
 268         this->public.credentials = (credential_store_t*)local_credential_store_create(strict);
 269
 270         /* load secrets, ca certificates and crls */
 271         credentials = this->public.credentials;
 272         credentials->load_ca_certificates(credentials);
 273         credentials->load_crls(credentials);
 274         credentials->load_secrets(credentials);
 275
 276         /* start building threads, we are multi-threaded NOW */
 277         this->public.stroke = stroke_create();
 278         this->public.sender = sender_create();
 279         this->public.receiver = receiver_create();
 280         this->public.scheduler = scheduler_create();
 281         this->public.kernel_interface = kernel_interface_create();
 282         this->public.thread_pool = thread_pool_create(NUMBER_OF_WORKING_THREADS);
 283 }
 284
 285 /**
 286  * Handle SIGSEGV/SIGILL signals raised by threads
 287  */
 288 void signal_handler(int signal)
 289 {
 290 #ifdef HAVE_BACKTRACE
 291         void *array[20];
 292         size_t size;
 293         char **strings;
 294         size_t i;
 295
 296         size = backtrace(array, 20);
 297         strings = backtrace_symbols(array, size);
 298
 299         DBG1(DBG_DMN, "thread %u received %s. Dumping %d frames from stack:",
 300                  pthread_self(), signal == SIGSEGV ? "SIGSEGV" : "SIGILL", size);
 301
 302         for (i = 0; i < size; i++)
 303         {
 304                 DBG1(DBG_DMN, "    %s", strings[i]);
 305         }
 306         free (strings);
 307 #else /* !HAVE_BACKTRACE */
 308         DBG1(DBG_DMN, "thread %u received %s",
 309                  pthread_self(), signal == SIGSEGV ? "SIGSEGV" : "SIGILL");
 310 #endif /* HAVE_BACKTRACE */
 311         DBG1(DBG_DMN, "killing ourself hard after SIGSEGV");
 312         raise(SIGKILL);
 313 }
 314
 315 /**
 316  * Create the daemon.
 317  */
 318 private_daemon_t *daemon_create(void)
 319 {
 320         private_daemon_t *this = malloc_thing(private_daemon_t);
 321         struct sigaction action;
 322
 323         /* assign methods */
 324         this->public.kill = (void (*) (daemon_t*,char*))kill_daemon;
 325
 326         /* NULL members for clean destruction */
 327         this->public.socket = NULL;
 328         this->public.ike_sa_manager = NULL;
 329         this->public.job_queue = NULL;
 330         this->public.event_queue = NULL;
 331         this->public.send_queue = NULL;
 332         this->public.configuration = NULL;
 333         this->public.credentials = NULL;
 334         this->public.connections = NULL;
 335         this->public.policies = NULL;
 336         this->public.sender= NULL;
 337         this->public.receiver = NULL;
 338         this->public.scheduler = NULL;
 339         this->public.kernel_interface = NULL;
 340         this->public.thread_pool = NULL;
 341         this->public.stroke = NULL;
 342         this->public.bus = NULL;
 343         this->public.outlog = NULL;
 344         this->public.syslog = NULL;
 345         this->public.authlog = NULL;
 346
 347         this->main_thread_id = pthread_self();
 348
 349         /* setup signal handling for all threads */
 350         sigemptyset(&(this->signal_set));
 351         sigaddset(&(this->signal_set), SIGSEGV);
 352         sigaddset(&(this->signal_set), SIGINT);
 353         sigaddset(&(this->signal_set), SIGHUP);
 354         sigaddset(&(this->signal_set), SIGTERM);
 355         pthread_sigmask(SIG_BLOCK, &(this->signal_set), 0);
 356
 357         /* setup SIGSEGV handler for all threads */
 358         action.sa_handler = signal_handler;
 359         action.sa_mask = this->signal_set;
 360         action.sa_flags = 0;
 361         sigaction(SIGSEGV, &action, NULL);
 362         sigaction(SIGILL, &action, NULL);
 363         return this;
 364 }
 365
 366 /**
 367  * print command line usage and exit
 368  */
 369 static void usage(const char *msg)
 370 {
 371         if (msg != NULL && *msg != '\0')
 372         {
 373                 fprintf(stderr, "%s\n", msg);
 374         }
 375         fprintf(stderr, "Usage: charon\n"
 376                                         "         [--help]\n"
 377                                         "         [--version]\n"
 378                                         "         [--strictcrlpolicy]\n"
 379                                         "         [--use-syslog]\n"
 380                                         "         [--debug-<type> <level>]\n"
 381                                         "           <type>:  log context type (dmn|mgr|ike|chd|job|cfg|knl|net|enc|lib)\n"
 382                                         "           <level>: log verbosity (-1 = silent, 0 = audit, 1 = control,\n"
 383                                         "                                    2 = controlmore, 3 = raw, 4 = private)\n"
 384                                         "\n"
 385                    );
 386         exit(msg == NULL? 0 : 1);
 387 }
 388
 389 /**
 390  * Main function, manages the daemon.
 391  */
 392 int main(int argc, char *argv[])
 393 {
 394         bool strict_crl_policy = FALSE;
 395         bool use_syslog = FALSE;
 396
 397         private_daemon_t *private_charon;
 398         FILE *pid_file;
 399         struct stat stb;
 400         linked_list_t *list;
 401         host_t *host;
 402         level_t levels[DBG_MAX];
 403         int signal;
 404
 405         /* use CTRL loglevel for default */
 406         for (signal = 0; signal < DBG_MAX; signal++)
 407         {
 408                 levels[signal] = LEVEL_CTRL;
 409         }
 410
 411         /* handle arguments */
 412         for (;;)
 413         {
 414                 struct option long_opts[] = {
 415                         { "help", no_argument, NULL, 'h' },
 416                         { "version", no_argument, NULL, 'v' },
 417                         { "use-syslog", no_argument, NULL, 'l' },
 418                         { "strictcrlpolicy", no_argument, NULL, 'r' },
 419                         /* TODO: handle "debug-all" */
 420                         { "debug-dmn", required_argument, &signal, DBG_DMN },
 421                         { "debug-mgr", required_argument, &signal, DBG_MGR },
 422                         { "debug-ike", required_argument, &signal, DBG_IKE },
 423                         { "debug-chd", required_argument, &signal, DBG_CHD },
 424                         { "debug-job", required_argument, &signal, DBG_JOB },
 425                         { "debug-cfg", required_argument, &signal, DBG_CFG },
 426                         { "debug-knl", required_argument, &signal, DBG_KNL },
 427                         { "debug-net", required_argument, &signal, DBG_NET },
 428                         { "debug-enc", required_argument, &signal, DBG_ENC },
 429                         { "debug-lib", required_argument, &signal, DBG_LIB },
 430                         { 0,0,0,0 }
 431                 };
 432
 433                 int c = getopt_long(argc, argv, "", long_opts, NULL);
 434                 switch (c)
 435                 {
 436                         case EOF:
 437                         break;
 438                         case 'h':
 439                                 usage(NULL);
 440                                 break;
 441                         case 'v':
 442                                 printf("Linux strongSwan %s\n", VERSION);
 443                                 exit(0);
 444                         case 'l':
 445                                 use_syslog = TRUE;
 446                                 continue;
 447                         case 'r':
 448                                 strict_crl_policy = TRUE;
 449                                 continue;
 450                         case 0:
 451                                 /* option is in signal */
 452                                 levels[signal] = atoi(optarg);
 453                                 continue;
 454                         default:
 455                                 usage("");
 456                                 break;
 457                 }
 458                 break;
 459         }
 460
 461         private_charon = daemon_create();
 462         charon = (daemon_t*)private_charon;
 463
 464         /* initialize daemon */
 465         initialize(private_charon, strict_crl_policy, use_syslog, levels);
 466
 467         /* check/setup PID file */
 468         if (stat(PID_FILE, &stb) == 0)
 469         {
 470                 DBG1(DBG_DMN, "charon already running (\""PID_FILE"\" exists)");
 471                 destroy(private_charon);
 472                 exit(-1);
 473         }
 474         pid_file = fopen(PID_FILE, "w");
 475         if (pid_file)
 476         {
 477                 fprintf(pid_file, "%d\n", getpid());
 478                 fclose(pid_file);
 479         }
 480         /* log socket info */
 481         list = charon->socket->create_local_address_list(charon->socket);
 482         DBG1(DBG_NET, "listening on %d addresses:", list->get_count(list));
 483         while (list->remove_first(list, (void**)&host) == SUCCESS)
 484         {
 485                 DBG1(DBG_NET, "  %H", host);
 486                 host->destroy(host);
 487         }
 488         list->destroy(list);
 489
 490         /* run daemon */
 491         run(private_charon);
 492
 493         /* normal termination, cleanup and exit */
 494         destroy(private_charon);
 495         unlink(PID_FILE);
 496
 497         return 0;
 498 }