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 #include <sa/authenticators/eap/eap_method.h>
  46
  47
  48 typedef struct private_daemon_t private_daemon_t;
  49
  50 /**
  51  * Private additions to daemon_t, contains threads and internal functions.
  52  */
  53 struct private_daemon_t {
  54         /**
  55          * Public members of daemon_t.
  56          */
  57         daemon_t public;
  58
  59         /**
  60          * Signal set used for signal handling.
  61          */
  62         sigset_t signal_set;
  63
  64         /**
  65          * The thread_id of main-thread.
  66          */
  67         pthread_t main_thread_id;
  68 };
  69
  70 /**
  71  * One and only instance of the daemon.
  72  */
  73 daemon_t *charon;
  74
  75 /**
  76  * hook in library for debugging messages
  77  */
  78 extern void (*dbg) (int level, char *fmt, ...);
  79
  80 /**
  81  * Logging hook for library logs, spreads debug message over bus
  82  */
  83 static void dbg_bus(int level, char *fmt, ...)
  84 {
  85         va_list args;
  86
  87         va_start(args, fmt);
  88         charon->bus->vsignal(charon->bus, DBG_LIB, level, fmt, args);
  89         va_end(args);
  90 }
  91
  92 /**
  93  * Logging hook for library logs, using stderr output
  94  */
  95 static void dbg_stderr(int level, char *fmt, ...)
  96 {
  97         va_list args;
  98
  99         va_start(args, fmt);
 100         fprintf(stderr, "00[LIB] ");
 101         vfprintf(stderr, fmt, args);
 102         fprintf(stderr, "\n");
 103         va_end(args);
 104 }
 105
 106 /**
 107  * Run the daemon and handle unix signals
 108  */
 109 static void run(private_daemon_t *this)
 110 {
 111         /* reselect signals for this thread */
 112         sigemptyset(&(this->signal_set));
 113         sigaddset(&(this->signal_set), SIGINT);
 114         sigaddset(&(this->signal_set), SIGHUP);
 115         sigaddset(&(this->signal_set), SIGTERM);
 116         pthread_sigmask(SIG_BLOCK, &(this->signal_set), 0);
 117
 118         while(TRUE)
 119         {
 120                 int signal_number;
 121                 int error;
 122
 123                 error = sigwait(&(this->signal_set), &signal_number);
 124                 if(error)
 125                 {
 126                         DBG1(DBG_DMN, "error %d while waiting for a signal", error);
 127                         return;
 128                 }
 129                 switch (signal_number)
 130                 {
 131                         case SIGHUP:
 132                         {
 133                                 DBG1(DBG_DMN, "signal of type SIGHUP received. Ignored");
 134                                 break;
 135                         }
 136                         case SIGINT:
 137                         {
 138                                 DBG1(DBG_DMN, "signal of type SIGINT received. Shutting down");
 139                                 return;
 140                         }
 141                         case SIGTERM:
 142                                 DBG1(DBG_DMN, "signal of type SIGTERM received. Shutting down");
 143                                 return;
 144                         default:
 145                         {
 146                                 DBG1(DBG_DMN, "unknown signal %d received. Ignored", signal_number);
 147                                 break;
 148                         }
 149                 }
 150         }
 151 }
 152
 153 /**
 154  * Clean up all daemon resources
 155  */
 156 static void destroy(private_daemon_t *this)
 157 {
 158         /* destruction is a non trivial task, we need to follow
 159         * a strict order to prevent threading issues!
 160         * Kill active threads first, except the sender, as
 161         * the killed IKE_SA want to send delete messages.
 162         */
 163         /* we don't want to receive anything anymore... */
 164         DESTROY_IF(this->public.receiver);
 165         /* ignore all incoming user requests */
 166         DESTROY_IF(this->public.stroke);
 167         /* stop scheduing jobs */
 168         DESTROY_IF(this->public.scheduler);
 169         /* stop processing jobs */
 170         DESTROY_IF(this->public.thread_pool);
 171         /* shut down manager with all IKE SAs */
 172         DESTROY_IF(this->public.ike_sa_manager);
 173         /* all child SAs should be down now, so kill kernel interface */
 174         DESTROY_IF(this->public.kernel_interface);
 175         /* destroy other infrastructure */
 176         DESTROY_IF(this->public.job_queue);
 177         DESTROY_IF(this->public.event_queue);
 178         DESTROY_IF(this->public.configuration);
 179         DESTROY_IF(this->public.credentials);
 180         DESTROY_IF(this->public.connections);
 181         DESTROY_IF(this->public.policies);
 182         sched_yield();
 183         /* we hope the sender could send the outstanding deletes, but
 184          * we shut down here at any cost */
 185         DESTROY_IF(this->public.sender);
 186         DESTROY_IF(this->public.send_queue);
 187         DESTROY_IF(this->public.socket);
 188         /* before destroying bus with its listeners, rehook library logs */
 189         dbg = dbg_stderr;
 190         DESTROY_IF(this->public.bus);
 191         DESTROY_IF(this->public.outlog);
 192         DESTROY_IF(this->public.syslog);
 193         DESTROY_IF(this->public.authlog);
 194         free(this);
 195 }
 196
 197 /**
 198  * Enforce daemon shutdown, with a given reason to do so.
 199  */
 200 static void kill_daemon(private_daemon_t *this, char *reason)
 201 {
 202         /* we send SIGTERM, so the daemon can cleanly shut down */
 203         DBG1(DBG_DMN, "killing daemon: %s", reason);
 204         if (this->main_thread_id == pthread_self())
 205         {
 206                 /* initialization failed, terminate daemon */
 207                 destroy(this);
 208                 unlink(PID_FILE);
 209                 exit(-1);
 210         }
 211         else
 212         {
 213                 DBG1(DBG_DMN, "sending SIGTERM to ourself");
 214                 raise(SIGTERM);
 215                 /* thread must die, since he produced a ciritcal failure and can't continue */
 216                 pthread_exit(NULL);
 217         }
 218 }
 219
 220 /**
 221  * Initialize the daemon, optional with a strict crl policy
 222  */
 223 static void initialize(private_daemon_t *this, bool strict, bool syslog,
 224                                            level_t levels[])
 225 {
 226         credential_store_t* credentials;
 227         signal_t signal;
 228
 229         /* for uncritical pseudo random numbers */
 230         srandom(time(NULL) + getpid());
 231
 232         /* setup bus and it's listeners first to enable log output */
 233         this->public.bus = bus_create();
 234         this->public.outlog = file_logger_create(stdout);
 235         this->public.syslog = sys_logger_create(LOG_DAEMON);
 236         this->public.authlog = sys_logger_create(LOG_AUTHPRIV);
 237         this->public.bus->add_listener(this->public.bus, &this->public.syslog->listener);
 238         this->public.bus->add_listener(this->public.bus, &this->public.outlog->listener);
 239         this->public.bus->add_listener(this->public.bus, &this->public.authlog->listener);
 240         this->public.authlog->set_level(this->public.authlog, SIG_ANY, LEVEL_AUDIT);
 241         /* set up hook to log dbg message in library via charons message bus */
 242         dbg = dbg_bus;
 243
 244         /* apply loglevels */
 245         for (signal = 0; signal < DBG_MAX; signal++)
 246         {
 247                 if (syslog)
 248                 {
 249                         this->public.syslog->set_level(this->public.syslog,
 250                                                                                    signal, levels[signal]);
 251                 }
 252                 else
 253                 {
 254                         this->public.outlog->set_level(this->public.outlog,
 255                                                                                    signal, levels[signal]);
 256                 }
 257         }
 258
 259         DBG1(DBG_DMN, "starting charon (strongSwan Version %s)", VERSION);
 260
 261         this->public.configuration = configuration_create();
 262         this->public.socket = socket_create(IKEV2_UDP_PORT, IKEV2_NATT_PORT);
 263         this->public.ike_sa_manager = ike_sa_manager_create();
 264         this->public.job_queue = job_queue_create();
 265         this->public.event_queue = event_queue_create();
 266         this->public.send_queue = send_queue_create();
 267         this->public.connections = (connection_store_t*)local_connection_store_create();
 268         this->public.policies = (policy_store_t*)local_policy_store_create();
 269         this->public.credentials = (credential_store_t*)local_credential_store_create(strict);
 270
 271         /* load secrets, ca certificates and crls */
 272         credentials = this->public.credentials;
 273         credentials->load_ca_certificates(credentials);
 274         credentials->load_crls(credentials);
 275         credentials->load_secrets(credentials);
 276
 277         /* start building threads, we are multi-threaded NOW */
 278         this->public.stroke = stroke_create();
 279         this->public.sender = sender_create();
 280         this->public.receiver = receiver_create();
 281         this->public.scheduler = scheduler_create();
 282         this->public.kernel_interface = kernel_interface_create();
 283         this->public.thread_pool = thread_pool_create(NUMBER_OF_WORKING_THREADS);
 284 }
 285
 286 /**
 287  * Handle SIGSEGV/SIGILL signals raised by threads
 288  */
 289 void signal_handler(int signal)
 290 {
 291 #ifdef HAVE_BACKTRACE
 292         void *array[20];
 293         size_t size;
 294         char **strings;
 295         size_t i;
 296
 297         size = backtrace(array, 20);
 298         strings = backtrace_symbols(array, size);
 299
 300         DBG1(DBG_DMN, "thread %u received %s. Dumping %d frames from stack:",
 301                  pthread_self(), signal == SIGSEGV ? "SIGSEGV" : "SIGILL", size);
 302
 303         for (i = 0; i < size; i++)
 304         {
 305                 DBG1(DBG_DMN, "    %s", strings[i]);
 306         }
 307         free (strings);
 308 #else /* !HAVE_BACKTRACE */
 309         DBG1(DBG_DMN, "thread %u received %s",
 310                  pthread_self(), signal == SIGSEGV ? "SIGSEGV" : "SIGILL");
 311 #endif /* HAVE_BACKTRACE */
 312         DBG1(DBG_DMN, "killing ourself hard after SIGSEGV");
 313         raise(SIGKILL);
 314 }
 315
 316 /**
 317  * Create the daemon.
 318  */
 319 private_daemon_t *daemon_create(void)
 320 {
 321         private_daemon_t *this = malloc_thing(private_daemon_t);
 322         struct sigaction action;
 323
 324         /* assign methods */
 325         this->public.kill = (void (*) (daemon_t*,char*))kill_daemon;
 326
 327         /* NULL members for clean destruction */
 328         this->public.socket = NULL;
 329         this->public.ike_sa_manager = NULL;
 330         this->public.job_queue = NULL;
 331         this->public.event_queue = NULL;
 332         this->public.send_queue = NULL;
 333         this->public.configuration = NULL;
 334         this->public.credentials = NULL;
 335         this->public.connections = NULL;
 336         this->public.policies = NULL;
 337         this->public.sender= NULL;
 338         this->public.receiver = NULL;
 339         this->public.scheduler = NULL;
 340         this->public.kernel_interface = NULL;
 341         this->public.thread_pool = NULL;
 342         this->public.stroke = NULL;
 343         this->public.bus = NULL;
 344         this->public.outlog = NULL;
 345         this->public.syslog = NULL;
 346         this->public.authlog = NULL;
 347
 348         this->main_thread_id = pthread_self();
 349
 350         /* setup signal handling for all threads */
 351         sigemptyset(&(this->signal_set));
 352         sigaddset(&(this->signal_set), SIGSEGV);
 353         sigaddset(&(this->signal_set), SIGINT);
 354         sigaddset(&(this->signal_set), SIGHUP);
 355         sigaddset(&(this->signal_set), SIGTERM);
 356         pthread_sigmask(SIG_BLOCK, &(this->signal_set), 0);
 357
 358         /* setup SIGSEGV handler for all threads */
 359         action.sa_handler = signal_handler;
 360         action.sa_mask = this->signal_set;
 361         action.sa_flags = 0;
 362         sigaction(SIGSEGV, &action, NULL);
 363         sigaction(SIGILL, &action, NULL);
 364         return this;
 365 }
 366
 367 /**
 368  * print command line usage and exit
 369  */
 370 static void usage(const char *msg)
 371 {
 372         if (msg != NULL && *msg != '\0')
 373         {
 374                 fprintf(stderr, "%s\n", msg);
 375         }
 376         fprintf(stderr, "Usage: charon\n"
 377                                         "         [--help]\n"
 378                                         "         [--version]\n"
 379                                         "         [--strictcrlpolicy]\n"
 380                                         "         [--use-syslog]\n"
 381                                         "         [--debug-<type> <level>]\n"
 382                                         "           <type>:  log context type (dmn|mgr|ike|chd|job|cfg|knl|net|enc|lib)\n"
 383                                         "           <level>: log verbosity (-1 = silent, 0 = audit, 1 = control,\n"
 384                                         "                                    2 = controlmore, 3 = raw, 4 = private)\n"
 385                                         "\n"
 386                    );
 387         exit(msg == NULL? 0 : 1);
 388 }
 389
 390 /**
 391  * Main function, manages the daemon.
 392  */
 393 int main(int argc, char *argv[])
 394 {
 395         bool strict_crl_policy = FALSE;
 396         bool use_syslog = FALSE;
 397         char *eapdir = IPSEC_EAPDIR;
 398
 399         private_daemon_t *private_charon;
 400         FILE *pid_file;
 401         struct stat stb;
 402         linked_list_t *list;
 403         host_t *host;
 404         level_t levels[DBG_MAX];
 405         int signal;
 406
 407         /* use CTRL loglevel for default */
 408         for (signal = 0; signal < DBG_MAX; signal++)
 409         {
 410                 levels[signal] = LEVEL_CTRL;
 411         }
 412
 413         /* handle arguments */
 414         for (;;)
 415         {
 416                 struct option long_opts[] = {
 417                         { "help", no_argument, NULL, 'h' },
 418                         { "version", no_argument, NULL, 'v' },
 419                         { "use-syslog", no_argument, NULL, 'l' },
 420                         { "strictcrlpolicy", no_argument, NULL, 'r' },
 421                         { "eapdir", required_argument, NULL, 'e' },
 422                         /* TODO: handle "debug-all" */
 423                         { "debug-dmn", required_argument, &signal, DBG_DMN },
 424                         { "debug-mgr", required_argument, &signal, DBG_MGR },
 425                         { "debug-ike", required_argument, &signal, DBG_IKE },
 426                         { "debug-chd", required_argument, &signal, DBG_CHD },
 427                         { "debug-job", required_argument, &signal, DBG_JOB },
 428                         { "debug-cfg", required_argument, &signal, DBG_CFG },
 429                         { "debug-knl", required_argument, &signal, DBG_KNL },
 430                         { "debug-net", required_argument, &signal, DBG_NET },
 431                         { "debug-enc", required_argument, &signal, DBG_ENC },
 432                         { "debug-lib", required_argument, &signal, DBG_LIB },
 433                         { 0,0,0,0 }
 434                 };
 435
 436                 int c = getopt_long(argc, argv, "", long_opts, NULL);
 437                 switch (c)
 438                 {
 439                         case EOF:
 440                         break;
 441                         case 'h':
 442                                 usage(NULL);
 443                                 break;
 444                         case 'v':
 445                                 printf("Linux strongSwan %s\n", VERSION);
 446                                 exit(0);
 447                         case 'l':
 448                                 use_syslog = TRUE;
 449                                 continue;
 450                         case 'r':
 451                                 strict_crl_policy = TRUE;
 452                                 continue;
 453                         case 'e':
 454                                 eapdir = optarg;
 455                                 continue;
 456                         case 0:
 457                                 /* option is in signal */
 458                                 levels[signal] = atoi(optarg);
 459                                 continue;
 460                         default:
 461                                 usage("");
 462                                 break;
 463                 }
 464                 break;
 465         }
 466
 467         private_charon = daemon_create();
 468         charon = (daemon_t*)private_charon;
 469
 470         /* initialize daemon */
 471         initialize(private_charon, strict_crl_policy, use_syslog, levels);
 472         /* load pluggable EAP modules */
 473         eap_method_load(eapdir);
 474
 475         /* check/setup PID file */
 476         if (stat(PID_FILE, &stb) == 0)
 477         {
 478                 DBG1(DBG_DMN, "charon already running (\""PID_FILE"\" exists)");
 479                 destroy(private_charon);
 480                 exit(-1);
 481         }
 482         pid_file = fopen(PID_FILE, "w");
 483         if (pid_file)
 484         {
 485                 fprintf(pid_file, "%d\n", getpid());
 486                 fclose(pid_file);
 487         }
 488
 489         /* log socket info */
 490         list = charon->socket->create_local_address_list(charon->socket);
 491         DBG1(DBG_NET, "listening on %d addresses:", list->get_count(list));
 492         while (list->remove_first(list, (void**)&host) == SUCCESS)
 493         {
 494                 DBG1(DBG_NET, "  %H", host);
 495                 host->destroy(host);
 496         }
 497         list->destroy(list);
 498
 499         /* run daemon */
 500         run(private_charon);
 501
 502         eap_method_unload();
 503         /* normal termination, cleanup and exit */
 504         destroy(private_charon);
 505         unlink(PID_FILE);
 506
 507         return 0;
 508 }