src/main/radiusd.c

   1 /*
   2  * radiusd.c    Main loop of the radius server.
   3  *
   4  * Version:     $Id$
   5  *
   6  *   This program is free software; you can redistribute it and/or modify
   7  *   it under the terms of the GNU General Public License as published by
   8  *   the Free Software Foundation; either version 2 of the License, or
   9  *   (at your option) any later version.
  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  * Copyright 2000,2001,2002,2003,2004  The FreeRADIUS server project
  21  * Copyright 1999,2000  Miquel van Smoorenburg <miquels@cistron.nl>
  22  * Copyright 2000  Alan DeKok <aland@ox.org>
  23  * Copyright 2000  Alan Curry <pacman-radius@cqc.com>
  24  * Copyright 2000  Jeff Carneal <jeff@apex.net>
  25  * Copyright 2000  Chad Miller <cmiller@surfsouth.com>
  26  */
  27
  28 /* don't look here for the version, run radiusd -v or look in version.c */
  29 static const char rcsid[] =
  30 "$Id$";
  31
  32 #include <freeradius-devel/autoconf.h>
  33
  34 #include <sys/file.h>
  35
  36 #ifdef HAVE_NETINET_IN_H
  37 #       include <netinet/in.h>
  38 #endif
  39
  40 #include <stdlib.h>
  41 #include <string.h>
  42 #include <fcntl.h>
  43 #include <ctype.h>
  44
  45 #ifdef HAVE_UNISTD_H
  46 #       include <unistd.h>
  47 #endif
  48
  49 #include <signal.h>
  50
  51 #ifdef HAVE_GETOPT_H
  52 #       include <getopt.h>
  53 #endif
  54
  55 #ifdef HAVE_SYS_SELECT_H
  56 #       include <sys/select.h>
  57 #endif
  58
  59 #ifdef HAVE_SYS_WAIT_H
  60 #       include <sys/wait.h>
  61 #endif
  62 #ifndef WEXITSTATUS
  63 #       define WEXITSTATUS(stat_val) ((unsigned)(stat_val) >> 8)
  64 #endif
  65 #ifndef WIFEXITED
  66 #       define WIFEXITED(stat_val) (((stat_val) & 255) == 0)
  67 #endif
  68
  69 #include <freeradius-devel/radiusd.h>
  70 #include <freeradius-devel/rad_assert.h>
  71 #include <freeradius-devel/conffile.h>
  72 #include <freeradius-devel/modules.h>
  73 #include <freeradius-devel/request_list.h>
  74 #include <freeradius-devel/radius_snmp.h>
  75
  76 #define SLEEP_FOREVER (65536)
  77
  78 /*
  79  *  Global variables.
  80  */
  81 const char *progname = NULL;
  82 const char *radius_dir = NULL;
  83 const char *radacct_dir = NULL;
  84 const char *radlog_dir = NULL;
  85 const char *radlib_dir = NULL;
  86 int log_stripped_names;
  87 int debug_flag = 0;
  88 int log_auth_detail = FALSE;
  89 int need_reload = FALSE;
  90 const char *radiusd_version = "FreeRADIUS Version " RADIUSD_VERSION ", for host " HOSTINFO ", built on " __DATE__ " at " __TIME__;
  91
  92 time_t time_now;
  93 static pid_t radius_pid;
  94
  95 /*
  96  *  Configuration items.
  97  */
  98 static int do_exit = 0;
  99
 100 /*
 101  *      Static functions.
 102  */
 103 static void usage(int);
 104
 105 static void sig_fatal (int);
 106 static void sig_hup (int);
 107
 108 /*
 109  *      The main guy.
 110  */
 111 int main(int argc, char *argv[])
 112 {
 113         REQUEST *request;
 114         unsigned char buffer[4096];
 115         fd_set readfds;
 116         int argval;
 117         int pid;
 118         int max_fd;
 119         int status;
 120         int sleep_time = SLEEP_FOREVER;
 121         int spawn_flag = TRUE;
 122         int dont_fork = FALSE;
 123         int sig_hup_block = FALSE;
 124         time_t last_cleaned_lists = 0;
 125
 126 #ifdef HAVE_SIGACTION
 127         struct sigaction act;
 128 #endif
 129         rad_listen_t *listener;
 130
 131 #ifdef OSFC2
 132         set_auth_parameters(argc,argv);
 133 #endif
 134
 135         if ((progname = strrchr(argv[0], '/')) == NULL)
 136                 progname = argv[0];
 137         else
 138                 progname++;
 139
 140         debug_flag = 0;
 141         spawn_flag = TRUE;
 142         radius_dir = strdup(RADIUS_DIR);
 143
 144         /*
 145          *      Ensure that the configuration is initialized.
 146          */
 147         memset(&mainconfig, 0, sizeof(mainconfig));
 148         mainconfig.myip.af = AF_UNSPEC;
 149         mainconfig.port = -1;
 150         mainconfig.radiusd_conf = "radiusd.conf";
 151
 152 #ifdef HAVE_SIGACTION
 153         memset(&act, 0, sizeof(act));
 154         act.sa_flags = 0 ;
 155         sigemptyset( &act.sa_mask ) ;
 156 #endif
 157
 158         /*  Process the options.  */
 159         while ((argval = getopt(argc, argv, "Aa:bcd:fg:hi:l:n:p:sSvxXyz")) != EOF) {
 160
 161                 switch(argval) {
 162
 163                         case 'A':
 164                                 log_auth_detail = TRUE;
 165                                 break;
 166
 167                         case 'a':
 168                                 if (radacct_dir) free(radacct_dir);
 169                                 radacct_dir = strdup(optarg);
 170                                 break;
 171
 172                         case 'c':
 173                                 /* ignore for backwards compatibility with Cistron */
 174                                 break;
 175
 176                         case 'd':
 177                                 if (radius_dir) free(radius_dir);
 178                                 radius_dir = strdup(optarg);
 179                                 break;
 180
 181                         case 'f':
 182                                 dont_fork = TRUE;
 183                                 break;
 184
 185                         case 'h':
 186                                 usage(0);
 187                                 break;
 188
 189                         case 'i':
 190                                 if (ip_hton(optarg, AF_UNSPEC, &mainconfig.myip) < 0) {
 191                                         fprintf(stderr, "radiusd: Invalid IP Address or hostname \"%s\"\n", optarg);
 192                                         exit(1);
 193                                 }
 194                                 break;
 195
 196                         case 'l':
 197                                 if ((strcmp(optarg, "stdout") == 0) ||
 198                                     (strcmp(optarg, "stderr") == 0) ||
 199                                     (strcmp(optarg, "syslog") == 0)) {
 200                                         fprintf(stderr, "radiusd: -l %s is unsupported.  Use log_destination in radiusd.conf\n", optarg);
 201                                         exit(1);
 202                                 }
 203                                 if (radlog_dir) free(radlog_dir);
 204                                 radlog_dir = strdup(optarg);
 205                                 break;
 206
 207                         case 'g':
 208                                 fprintf(stderr, "radiusd: -g is unsupported.  Use log_destination in radiusd.conf.\n");
 209                                 exit(1);
 210                                 break;
 211
 212                         case 'n':
 213                                 if ((strchr(optarg, '/') != NULL) ||
 214                                     (strchr(optarg, '.') != NULL) ||
 215                                     (strlen(optarg) > 45)) usage(1);
 216
 217                                 snprintf(buffer, sizeof(buffer), "%s.conf",
 218                                          optarg);
 219                                 if (mainconfig.radiusd_conf)
 220                                         free(mainconfig.radiusd_conf);
 221                                 mainconfig.radiusd_conf = strdup(buffer);
 222                                 break;
 223
 224                         case 'S':
 225                                 log_stripped_names++;
 226                                 break;
 227
 228                         case 'p':
 229                                 mainconfig.port = atoi(optarg);
 230                                 if ((mainconfig.port <= 0) ||
 231                                     (mainconfig.port >= 65536)) {
 232                                         fprintf(stderr, "radiusd: Invalid port number %s\n", optarg);
 233                                         exit(1);
 234                                 }
 235                                 break;
 236
 237                         case 's':       /* Single process mode */
 238                                 spawn_flag = FALSE;
 239                                 dont_fork = TRUE;
 240                                 break;
 241
 242                         case 'v':
 243                                 version();
 244                                 break;
 245
 246                                 /*
 247                                  *  BIG debugging mode for users who are
 248                                  *  TOO LAZY to type '-sfxxyz -l stdout' themselves.
 249                                  */
 250                         case 'X':
 251                                 spawn_flag = FALSE;
 252                                 dont_fork = TRUE;
 253                                 debug_flag += 2;
 254                                 mainconfig.log_auth = TRUE;
 255                                 mainconfig.log_auth_badpass = TRUE;
 256                                 mainconfig.log_auth_goodpass = TRUE;
 257                                 mainconfig.radlog_dest = RADLOG_STDOUT;
 258                                 break;
 259
 260                         case 'x':
 261                                 debug_flag++;
 262                                 break;
 263
 264                         case 'y':
 265                                 mainconfig.log_auth = TRUE;
 266                                 mainconfig.log_auth_badpass = TRUE;
 267                                 break;
 268
 269                         case 'z':
 270                                 mainconfig.log_auth_badpass = TRUE;
 271                                 mainconfig.log_auth_goodpass = TRUE;
 272                                 break;
 273
 274                         default:
 275                                 usage(1);
 276                                 break;
 277                 }
 278         }
 279
 280         /*  Read the configuration files, BEFORE doing anything else.  */
 281         if (read_mainconfig(0) < 0) {
 282                 exit(1);
 283         }
 284
 285         /*
 286          *  Disconnect from session
 287          */
 288         if (debug_flag == 0 && dont_fork == FALSE) {
 289                 pid = fork();
 290                 if(pid < 0) {
 291                         radlog(L_ERR|L_CONS, "Couldn't fork");
 292                         exit(1);
 293                 }
 294
 295                 /*
 296                  *  The parent exits, so the child can run in the background.
 297                  */
 298                 if (pid > 0) {
 299                         exit(0);
 300                 }
 301 #ifdef HAVE_SETSID
 302                 setsid();
 303 #endif
 304         }
 305
 306         /*
 307          *      If we're NOT debugging, trap fatal signals, so we can
 308          *      easily clean up after ourselves.
 309          *
 310          *      If we ARE debugging, don't trap them, so we can
 311          *      dump core.
 312          */
 313         if ((mainconfig.allow_core_dumps == FALSE) && (debug_flag == 0)) {
 314 #ifdef SIGSEGV
 315 #ifdef HAVE_SIGACTION
 316                 act.sa_handler = sig_fatal;
 317                 sigaction(SIGSEGV, &act, NULL);
 318 #else
 319                 signal(SIGSEGV, sig_fatal);
 320 #endif
 321 #endif
 322         }
 323
 324 #ifdef WITH_SNMP
 325         if (mainconfig.do_snmp) radius_snmp_init();
 326 #endif
 327
 328         /*
 329          *  Ensure that we're using the CORRECT pid after forking,
 330          *  NOT the one we started with.
 331          */
 332         radius_pid = getpid();
 333
 334
 335         /*
 336          *  Only write the PID file if we're running as a daemon.
 337          *
 338          *  And write it AFTER we've forked, so that we write the
 339          *  correct PID.
 340          */
 341         if (dont_fork == FALSE) {
 342                 FILE *fp;
 343
 344                 fp = fopen(mainconfig.pid_file, "w");
 345                 if (fp != NULL) {
 346                         /*
 347                          *      FIXME: What about following symlinks,
 348                          *      and having it over-write a normal file?
 349                          */
 350                         fprintf(fp, "%d\n", (int) radius_pid);
 351                         fclose(fp);
 352                 } else {
 353                         radlog(L_ERR|L_CONS, "Failed creating PID file %s: %s\n",
 354                                mainconfig.pid_file, strerror(errno));
 355                         exit(1);
 356                 }
 357         }
 358
 359         /*
 360          *      If we're running as a daemon, close the default file
 361          *      descriptors, AFTER forking.
 362          */
 363         mainconfig.radlog_fd = -1;
 364         if (debug_flag) {
 365                 mainconfig.radlog_fd = STDOUT_FILENO;
 366         } else {
 367                 int devnull;
 368
 369                 devnull = open("/dev/null", O_RDWR);
 370                 if (devnull < 0) {
 371                         radlog(L_ERR|L_CONS, "Failed opening /dev/null: %s\n",
 372                                strerror(errno));
 373                         exit(1);
 374                 }
 375                 dup2(devnull, STDIN_FILENO);
 376                 if (mainconfig.radlog_dest == RADLOG_STDOUT) {
 377                         mainconfig.radlog_fd = dup(STDOUT_FILENO);
 378                 }
 379                 dup2(devnull, STDOUT_FILENO);
 380                 if (mainconfig.radlog_dest == RADLOG_STDERR) {
 381                         mainconfig.radlog_fd = dup(STDERR_FILENO);
 382                 }
 383                 dup2(devnull, STDERR_FILENO);
 384                 close(devnull);
 385         }
 386
 387         /*
 388          *      It's called the thread pool, but it does a little
 389          *      more than that.
 390          */
 391         thread_pool_init(spawn_flag);
 392
 393         /*
 394          *  Use linebuffered or unbuffered stdout if
 395          *  the debug flag is on.
 396          */
 397         if (debug_flag == TRUE)
 398                 setlinebuf(stdout);
 399
 400         /*
 401          *      Print out which ports we're listening on.
 402          */
 403         for (listener = mainconfig.listen;
 404              listener != NULL;
 405              listener = listener->next) {
 406                 listener->print(listener, buffer, sizeof(buffer));
 407                 switch (listener->type) {
 408                 case RAD_LISTEN_AUTH:
 409                         DEBUG("Listening on authentication address %s", buffer);
 410                         break;
 411
 412                 case RAD_LISTEN_ACCT:
 413                         DEBUG("Listening on accounting address %s", buffer);
 414                         break;
 415
 416                 case RAD_LISTEN_PROXY:
 417                         DEBUG("Listening on proxy address %s", buffer);
 418                         break;
 419
 420                 case RAD_LISTEN_DETAIL:
 421                         DEBUG("Listening on detail file %s", buffer);
 422                         break;
 423
 424                 default:
 425                         break;
 426                 }
 427         }
 428
 429         /*
 430          *      Now that we've set everything up, we can install the signal
 431          *      handlers.  Before this, if we get any signal, we don't know
 432          *      what to do, so we might as well do the default, and die.
 433          */
 434         signal(SIGPIPE, SIG_IGN);
 435 #ifdef HAVE_SIGACTION
 436         act.sa_handler = sig_hup;
 437         sigaction(SIGHUP, &act, NULL);
 438         act.sa_handler = sig_fatal;
 439         sigaction(SIGTERM, &act, NULL);
 440 #else
 441         signal(SIGHUP, sig_hup);
 442         signal(SIGTERM, sig_fatal);
 443 #endif
 444         /*
 445          *      If we're debugging, then a CTRL-C will cause the
 446          *      server to die immediately.  Use SIGTERM to shut down
 447          *      the server cleanly in that case.
 448          */
 449         if (debug_flag == 0) {
 450 #ifdef HAVE_SIGACTION
 451                 act.sa_handler = sig_fatal;
 452                 sigaction(SIGINT, &act, NULL);
 453                 sigaction(SIGQUIT, &act, NULL);
 454 #else
 455                 signal(SIGINT, sig_fatal);
 456                 signal(SIGQUIT, sig_fatal);
 457 #endif
 458         }
 459
 460         radlog(L_INFO, "Ready to process requests.");
 461
 462         /*
 463          *  Receive user requests
 464          */
 465         for (;;) {
 466                 /*
 467                  *      If we've been told to exit, then do so,
 468                  *      even if we have data waiting.
 469                  */
 470                 if (do_exit) {
 471                         DEBUG("Exiting...");
 472
 473                         /*
 474                          *      Ignore the TERM signal: we're about
 475                          *      to die.
 476                          */
 477                         signal(SIGTERM, SIG_IGN);
 478
 479                         /*
 480                          *      Send a TERM signal to all associated
 481                          *      processes (including us, which gets
 482                          *      ignored.)
 483                          */
 484                         kill(-radius_pid, SIGTERM);
 485
 486                         /*
 487                          *      FIXME: Kill child threads, and
 488                          *      clean up?
 489                          */
 490
 491                         /*
 492                          *      Detach any modules.
 493                          */
 494                         detach_modules();
 495
 496                         /*
 497                          *      FIXME: clean up any active REQUEST
 498                          *      handles.
 499                          */
 500
 501                         /*
 502                          *      We're exiting, so we can delete the PID
 503                          *      file.  (If it doesn't exist, we can ignore
 504                          *      the error returned by unlink)
 505                          */
 506                         if (dont_fork == FALSE) {
 507                                 unlink(mainconfig.pid_file);
 508                         }
 509
 510                         /*
 511                          *      Free the configuration items.
 512                          */
 513                         free_mainconfig();
 514
 515                         /*
 516                          *      SIGTERM gets do_exit=0,
 517                          *      and we want to exit cleanly.
 518                          *
 519                          *      Other signals make us exit
 520                          *      with an error status.
 521                          */
 522                         exit(do_exit - 1);
 523                 }
 524
 525                 if (need_reload) {
 526 #ifdef HAVE_PTHREAD_H
 527                         /*
 528                          *      Threads: wait for all threads to stop
 529                          *      processing before re-loading the
 530                          *      config, so we don't pull the rug out
 531                          *      from under them.
 532                          */
 533                         int max_wait = 0;
 534                         if (spawn_flag) for(;;) {
 535                                 /*
 536                                  * Block until there are '0' threads
 537                                  * with a REQUEST handle.
 538                                  */
 539                                 sig_hup_block = TRUE;
 540                                 if( (total_active_threads() == 0) ||
 541                                     (max_wait >= 5) ) {
 542                                         sig_hup_block = FALSE;
 543                                         break;
 544                                 }
 545                                 sleep(1);
 546                                 max_wait++;
 547                         }
 548 #endif
 549                         if (read_mainconfig(TRUE) < 0) {
 550                                 exit(1);
 551                         }
 552
 553                         need_reload = FALSE;
 554                         radlog(L_INFO, "Ready to process requests.");
 555                 }
 556
 557                 FD_ZERO(&readfds);
 558                 max_fd = 0;
 559
 560                 /*
 561                  *      Loop over all the listening FD's.
 562                  */
 563                 for (listener = mainconfig.listen;
 564                      listener != NULL;
 565                      listener = listener->next) {
 566                         if (listener->fd < 0) continue;
 567
 568                         FD_SET(listener->fd, &readfds);
 569                         if (listener->fd > max_fd) max_fd = listener->fd;
 570                 }
 571
 572 #ifdef WITH_SNMP
 573                 if (mainconfig.do_snmp &&
 574                     (rad_snmp.smux_fd >= 0)) {
 575                         FD_SET(rad_snmp.smux_fd, &readfds);
 576                         if (rad_snmp.smux_fd > max_fd) max_fd = rad_snmp.smux_fd;
 577                 }
 578 #endif
 579
 580                 if (sleep_time == SLEEP_FOREVER) {
 581                         DEBUG2("Nothing to do.  Sleeping until we see a request.");
 582                         status = select(max_fd + 1, &readfds, NULL, NULL, NULL);
 583                 } else {
 584                         struct timeval tv;
 585
 586                         DEBUG2("Waking up in %d seconds...", sleep_time);
 587
 588                         tv.tv_sec = sleep_time;
 589                         tv.tv_usec = 0;
 590                         status = select(max_fd + 1, &readfds, NULL, NULL, &tv);
 591                 }
 592                 if (status == -1) {
 593                         /*
 594                          *      On interrupts, we clean up the request
 595                          *      list.  We then continue with the loop,
 596                          *      so that if we're supposed to exit,
 597                          *      then the code at the start of the loop
 598                          *      catches that, and exits.
 599                          */
 600                         if (errno == EINTR) {
 601 #ifdef MEMORY_USE_DEBUGGING
 602                                 /*
 603                                  *      Run the server in debugging mode,
 604                                  *      without threads, and give it a
 605                                  *      SIGHUP.  It will clean up after
 606                                  *      itself, and any memory left over
 607                                  *      should be allocated by C libraries,
 608                                  *      and the like.
 609                                  */
 610                                 detach_modules();
 611                                 free_mainconfig();
 612                                 xlat_free();
 613                                 dict_free();
 614                                 exit(1);
 615 #endif
 616                                 continue;
 617                         }
 618                         radlog(L_ERR, "Unexpected error in select(): %s",
 619                                         strerror(errno));
 620                         exit(1);
 621                 }
 622
 623                 time_now = time(NULL);
 624 #ifndef HAVE_PTHREAD_H
 625                 /*
 626                  *      If there are no child threads, then there may
 627                  *      be child processes.  In that case, wait for
 628                  *      their exit status, and throw that exit status
 629                  *      away.  This helps get rid of zxombie children.
 630                  */
 631                 while (waitpid(-1, &argval, WNOHANG) > 0) {
 632                         /* do nothing */
 633                 }
 634 #endif
 635
 636                 /*
 637                  *      Loop over the open socket FD's, reading any data.
 638                  */
 639                 for (listener = mainconfig.listen;
 640                      listener != NULL;
 641                      listener = listener->next) {
 642                         RAD_REQUEST_FUNP fun;
 643
 644                         if ((listener->fd >= 0) &&
 645                             !FD_ISSET(listener->fd, &readfds))
 646                                 continue;
 647
 648                         /*
 649                          *  Receive the packet.
 650                          */
 651                         if (sig_hup_block != FALSE) {
 652                                 continue;
 653                         }
 654
 655                         /*
 656                          *      Do per-socket receive processing of the
 657                          *      packet.
 658                          */
 659                         if (!listener->recv(listener, &fun, &request)) {
 660                                 continue;
 661                         }
 662
 663                         /*
 664                          *      Drop the request into the thread pool,
 665                          *      and let the thread pool take care of
 666                          *      doing something with it.
 667                          */
 668                         if (!thread_pool_addrequest(request, fun)) {
 669                                 /*
 670                                  *      FIXME: Maybe just drop
 671                                  *      the packet on the floor?
 672                                  */
 673                                 request_reject(request, REQUEST_FAIL_NO_THREADS);
 674                                 request->finished = TRUE;
 675                         }
 676                 } /* loop over listening sockets*/
 677
 678 #ifdef WITH_SNMP
 679                 if (mainconfig.do_snmp) {
 680                         /*
 681                          *  After handling all authentication/accounting
 682                          *  requests, THEN process any pending SMUX/SNMP
 683                          *  queries.
 684                          *
 685                          *  Note that the handling is done in the main server,
 686                          *  which probably isn't a Good Thing.  It really
 687                          *  should be wrapped, and handled in a thread pool.
 688                          */
 689                         if ((rad_snmp.smux_fd >= 0) &&
 690                             FD_ISSET(rad_snmp.smux_fd, &readfds) &&
 691                             (rad_snmp.smux_event == SMUX_READ)) {
 692                                 smux_read();
 693                         }
 694
 695                         /*
 696                          *  If we've got to re-connect, then do so now,
 697                          *  before calling select again.
 698                          */
 699                         if (rad_snmp.smux_event == SMUX_CONNECT) {
 700                                 smux_connect();
 701                         }
 702                 }
 703 #endif
 704
 705                 /*
 706                  *      Loop through the request lists once per
 707                  *      second, to clean up old requests.
 708                  */
 709                 if (last_cleaned_lists != time_now) {
 710                         last_cleaned_lists = time_now;
 711
 712                         DEBUG2("--- Walking the entire request list ---");
 713                         sleep_time = SLEEP_FOREVER;
 714                         for (listener = mainconfig.listen;
 715                              listener != NULL;
 716                              listener = listener->next) {
 717                                 int next;
 718
 719                                 next = listener->update(listener, time_now);
 720                                 if (next < sleep_time) {
 721                                         sleep_time = next;
 722                                 }
 723                         }
 724                 }
 725
 726 #ifdef HAVE_PTHREAD_H
 727
 728                 /*
 729                  *      Only clean the thread pool if we're spawning
 730                  *      child threads.
 731                  */
 732                 if (spawn_flag) {
 733                         thread_pool_clean(time_now);
 734                 }
 735 #endif
 736         } /* loop forever */
 737 }
 738
 739
 740 /*
 741  *  Display the syntax for starting this program.
 742  */
 743 static void NEVER_RETURNS usage(int status)
 744 {
 745         FILE *output = status?stderr:stdout;
 746
 747         fprintf(output,
 748                         "Usage: %s [-a acct_dir] [-d db_dir] [-l log_dir] [-i address] [-AcfnsSvXxyz]\n", progname);
 749         fprintf(output, "Options:\n\n");
 750         fprintf(output, "  -a acct_dir     use accounting directory 'acct_dir'.\n");
 751         fprintf(output, "  -A              Log auth detail.\n");
 752         fprintf(output, "  -d raddb_dir    Configuration files are in \"raddbdir/*\".\n");
 753         fprintf(output, "  -f              Run as a foreground process, not a daemon.\n");
 754         fprintf(output, "  -h              Print this help message.\n");
 755         fprintf(output, "  -i ipaddr       Listen on ipaddr ONLY\n");
 756         fprintf(output, "  -l log_dir      Log file is \"log_dir/radius.log\" (not used in debug mode)\n");
 757         fprintf(output, "  -p port         Listen on port ONLY\n");
 758         fprintf(output, "  -s              Do not spawn child processes to handle requests.\n");
 759         fprintf(output, "  -S              Log stripped names.\n");
 760         fprintf(output, "  -v              Print server version information.\n");
 761         fprintf(output, "  -X              Turn on full debugging.\n");
 762         fprintf(output, "  -x              Turn on additional debugging. (-xx gives more debugging).\n");
 763         fprintf(output, "  -y              Log authentication failures, with password.\n");
 764         fprintf(output, "  -z              Log authentication successes, with password.\n");
 765         exit(status);
 766 }
 767
 768
 769 /*
 770  *      We got a fatal signal.
 771  */
 772 static void sig_fatal(int sig)
 773 {
 774         switch(sig) {
 775                 case SIGSEGV:
 776                         /* We can't really do anything intelligent here so just die */
 777                         _exit(1);
 778                 case SIGTERM:
 779                         do_exit = 1;
 780                         break;
 781                 default:
 782                         do_exit = 2;
 783                         break;
 784         }
 785 }
 786
 787
 788 /*
 789  *  We got the hangup signal.
 790  *  Re-read the configuration files.
 791  */
 792 /*ARGSUSED*/
 793 static void sig_hup(int sig)
 794 {
 795         sig = sig; /* -Wunused */
 796
 797         reset_signal(SIGHUP, sig_hup);
 798
 799         /*
 800          *  Only do the reload if we're the main server, both
 801          *  for processes, and for threads.
 802          */
 803         if (getpid() == radius_pid) {
 804                 need_reload = TRUE;
 805         }
 806 #ifdef WITH_SNMP
 807         if (mainconfig.do_snmp) {
 808                 rad_snmp.smux_failures = 0;
 809                 rad_snmp.smux_event = SMUX_CONNECT;
 810         }
 811 #endif
 812 }