src/main/modules.c

   1 /*
   2  * modules.c    Radius module support.
   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 2003,2006  The FreeRADIUS server project
  21  * Copyright 2000  Alan DeKok <aland@ox.org>
  22  * Copyright 2000  Alan Curry <pacman@world.std.com>
  23  */
  24
  25 RCSID("$Id$")
  26
  27 #include <freeradius-devel/radiusd.h>
  28 #include <freeradius-devel/modpriv.h>
  29 #include <freeradius-devel/modcall.h>
  30 #include <freeradius-devel/parser.h>
  31 #include <freeradius-devel/rad_assert.h>
  32
  33 extern bool check_config;
  34
  35 typedef struct indexed_modcallable {
  36         rlm_components_t        comp;
  37         int                     idx;
  38         modcallable             *modulelist;
  39 } indexed_modcallable;
  40
  41 typedef struct virtual_server_t {
  42         char const      *name;
  43         time_t          created;
  44         int             can_free;
  45         CONF_SECTION    *cs;
  46         rbtree_t        *components;
  47         modcallable     *mc[RLM_COMPONENT_COUNT];
  48         CONF_SECTION    *subcs[RLM_COMPONENT_COUNT];
  49         struct virtual_server_t *next;
  50 } virtual_server_t;
  51
  52 /*
  53  *      Keep a hash of virtual servers, so that we can reload them.
  54  */
  55 #define VIRTUAL_SERVER_HASH_SIZE (256)
  56 static virtual_server_t *virtual_servers[VIRTUAL_SERVER_HASH_SIZE];
  57
  58 static rbtree_t *module_tree = NULL;
  59
  60 static rbtree_t *instance_tree = NULL;
  61
  62 struct fr_module_hup_t {
  63         module_instance_t       *mi;
  64         time_t                  when;
  65         void                    *insthandle;
  66         fr_module_hup_t         *next;
  67 };
  68
  69 /*
  70  *      Ordered by component
  71  */
  72 const section_type_value_t section_type_value[RLM_COMPONENT_COUNT] = {
  73         { "authenticate", "Auth-Type",       PW_AUTH_TYPE },
  74         { "authorize",    "Autz-Type",       PW_AUTZ_TYPE },
  75         { "preacct",      "Pre-Acct-Type",   PW_PRE_ACCT_TYPE },
  76         { "accounting",   "Acct-Type",       PW_ACCT_TYPE },
  77         { "session",      "Session-Type",    PW_SESSION_TYPE },
  78         { "pre-proxy",    "Pre-Proxy-Type",  PW_PRE_PROXY_TYPE },
  79         { "post-proxy",   "Post-Proxy-Type", PW_POST_PROXY_TYPE },
  80         { "post-auth",    "Post-Auth-Type",  PW_POST_AUTH_TYPE }
  81 #ifdef WITH_COA
  82         ,
  83         { "recv-coa",     "Recv-CoA-Type",   PW_RECV_COA_TYPE },
  84         { "send-coa",     "Send-CoA-Type",   PW_SEND_COA_TYPE }
  85 #endif
  86 };
  87
  88 #ifndef RTLD_NOW
  89 #define RTLD_NOW (0)
  90 #endif
  91 #ifndef RTLD_LOCAL
  92 #define RTLD_LOCAL (0)
  93 #endif
  94
  95 #ifdef __APPLE__
  96 #define LT_SHREXT ".dylib"
  97 #define LD_LIBRARY_PATH "DYLD_FALLBACK_LIBRARY_PATH"
  98 #elif defined (WIN32)
  99 #define LT_SHREXT ".dll"
 100 #else
 101 #define LT_SHREXT ".so"
 102 #define LD_LIBRARY_PATH "LD_LIBRARY_PATH"
 103 #endif
 104
 105 /** Check if the magic number in the module matches the one in the library
 106  *
 107  * This is used to detect potential ABI issues caused by running with modules which
 108  * were built for a different version of the server.
 109  *
 110  * @param cs being parsed.
 111  * @param module being loaded.
 112  * @returns 0 on success, -1 if prefix mismatch, -2 if version mismatch, -3 if commit mismatch.
 113  */
 114 static int check_module_magic(CONF_SECTION *cs, module_t const *module)
 115 {
 116         if (MAGIC_PREFIX(module->magic) != MAGIC_PREFIX(RADIUSD_MAGIC_NUMBER)) {
 117                 cf_log_err_cs(cs, "Application and rlm_%s magic number (prefix) mismatch."
 118                               "  application: %x module: %x", module->name,
 119                               MAGIC_PREFIX(RADIUSD_MAGIC_NUMBER),
 120                               MAGIC_PREFIX(module->magic));
 121                 return -1;
 122         }
 123
 124         if (MAGIC_VERSION(module->magic) != MAGIC_VERSION(RADIUSD_MAGIC_NUMBER)) {
 125                 cf_log_err_cs(cs, "Application and rlm_%s magic number (version) mismatch."
 126                               "  application: %lx module: %lx", module->name,
 127                               (unsigned long) MAGIC_VERSION(RADIUSD_MAGIC_NUMBER),
 128                               (unsigned long) MAGIC_VERSION(module->magic));
 129                 return -2;
 130         }
 131
 132         if (MAGIC_COMMIT(module->magic) != MAGIC_COMMIT(RADIUSD_MAGIC_NUMBER)) {
 133                 cf_log_err_cs(cs, "Application and rlm_%s magic number (commit) mismatch."
 134                               "  application: %lx module: %lx", module->name,
 135                               (unsigned long) MAGIC_COMMIT(RADIUSD_MAGIC_NUMBER),
 136                               (unsigned long) MAGIC_COMMIT(module->magic));
 137                 return -3;
 138         }
 139
 140         return 0;
 141 }
 142
 143 /*
 144  *      Because dlopen produces really shitty and inaccurate error messages
 145  */
 146 static void check_lib_access(char const *name)
 147 {
 148         if (access(name, R_OK) < 0) switch (errno) {
 149                 case EACCES:
 150                         WDEBUG("Library \"%s\" exists, but we don't have permission to read", name);
 151                         break;
 152                 case ENOENT:
 153                         DEBUG4("Library not found at path \"%s\"", name);
 154                         break;
 155                 default:
 156                         DEBUG4("Possible issue accessing Library \"%s\": %s", name, strerror(errno));
 157                         break;
 158         }
 159 }
 160
 161 lt_dlhandle lt_dlopenext(char const *name)
 162 {
 163         int flags = RTLD_NOW;
 164         void *handle;
 165         char buffer[2048];
 166
 167 #ifdef RTLD_GLOBAL
 168         if (strcmp(name, "rlm_perl") == 0) {
 169                 flags |= RTLD_GLOBAL;
 170         } else
 171 #endif
 172                 flags |= RTLD_LOCAL;
 173
 174         /*
 175          *      Prefer loading our libraries by absolute path.
 176          */
 177         snprintf(buffer, sizeof(buffer), "%s/%s%s", radlib_dir, name, LT_SHREXT);
 178
 179         check_lib_access(buffer);
 180
 181         handle = dlopen(buffer, flags);
 182         if (handle) return handle;
 183
 184         strlcpy(buffer, name, sizeof(buffer));
 185
 186         /*
 187          *      FIXME: Make this configurable...
 188          */
 189         strlcat(buffer, LT_SHREXT, sizeof(buffer));
 190
 191         return dlopen(buffer, flags);
 192 }
 193
 194 void *lt_dlsym(lt_dlhandle handle, UNUSED char const *symbol)
 195 {
 196         return dlsym(handle, symbol);
 197 }
 198
 199 int lt_dlclose(lt_dlhandle handle)
 200 {
 201         if (!handle) return 0;
 202
 203         return dlclose(handle);
 204 }
 205
 206 char const *lt_dlerror(void)
 207 {
 208         return dlerror();
 209 }
 210
 211 static int virtual_server_idx(char const *name)
 212 {
 213         uint32_t hash;
 214
 215         if (!name) return 0;
 216
 217         hash = fr_hash_string(name);
 218
 219         return hash & (VIRTUAL_SERVER_HASH_SIZE - 1);
 220 }
 221
 222 static virtual_server_t *virtual_server_find(char const *name)
 223 {
 224         rlm_rcode_t rcode;
 225         virtual_server_t *server;
 226
 227         rcode = virtual_server_idx(name);
 228         for (server = virtual_servers[rcode];
 229              server != NULL;
 230              server = server->next) {
 231                 if (!name && !server->name) break;
 232
 233                 if ((name && server->name) &&
 234                     (strcmp(name, server->name) == 0)) break;
 235         }
 236
 237         return server;
 238 }
 239
 240 static int virtual_server_free(virtual_server_t *server)
 241 {
 242         if (server->components) rbtree_free(server->components);
 243         return 0;
 244 }
 245
 246 void virtual_servers_free(time_t when)
 247 {
 248         int i;
 249         virtual_server_t **last;
 250
 251         for (i = 0; i < VIRTUAL_SERVER_HASH_SIZE; i++) {
 252                 virtual_server_t *server, *next;
 253
 254                 last = &virtual_servers[i];
 255                 for (server = virtual_servers[i];
 256                      server != NULL;
 257                      server = next) {
 258                         next = server->next;
 259
 260                         /*
 261                          *      If we delete it, fix the links so that
 262                          *      we don't orphan anything.  Also,
 263                          *      delete it if it's old, AND a newer one
 264                          *      was defined.
 265                          *
 266                          *      Otherwise, the last pointer gets set to
 267                          *      the one we didn't delete.
 268                          */
 269                         if ((when == 0) ||
 270                             ((server->created < when) && server->can_free)) {
 271                                 *last = server->next;
 272                                 talloc_free(server);
 273                         } else {
 274                                 last = &(server->next);
 275                         }
 276                 }
 277         }
 278 }
 279
 280 static int indexed_modcallable_free(indexed_modcallable *this)
 281 {
 282         modcallable_free(&this->modulelist);
 283         return 0;
 284 }
 285
 286 static int indexed_modcallable_cmp(void const *one, void const *two)
 287 {
 288         indexed_modcallable const *a = one;
 289         indexed_modcallable const *b = two;
 290
 291         if (a->comp < b->comp) return -1;
 292         if (a->comp >  b->comp) return +1;
 293
 294         return a->idx - b->idx;
 295 }
 296
 297
 298 /*
 299  *      Compare two module entries
 300  */
 301 static int module_instance_cmp(void const *one, void const *two)
 302 {
 303         module_instance_t const *a = one;
 304         module_instance_t const *b = two;
 305
 306         return strcmp(a->name, b->name);
 307 }
 308
 309
 310 static void module_instance_free_old(UNUSED CONF_SECTION *cs, module_instance_t *node,
 311                                      time_t when)
 312 {
 313         fr_module_hup_t *mh, **last;
 314
 315         /*
 316          *      Walk the list, freeing up old instances.
 317          */
 318         last = &(node->mh);
 319         while (*last) {
 320                 mh = *last;
 321
 322                 /*
 323                  *      Free only every 60 seconds.
 324                  */
 325                 if ((when - mh->when) < 60) {
 326                         last = &(mh->next);
 327                         continue;
 328                 }
 329
 330                 talloc_free(mh->insthandle);
 331
 332                 *last = mh->next;
 333                 talloc_free(mh);
 334         }
 335 }
 336
 337
 338 /*
 339  *      Free a module instance.
 340  */
 341 static void module_instance_free(void *data)
 342 {
 343         module_instance_t *this = data;
 344
 345         module_instance_free_old(this->cs, this, time(NULL) + 100);
 346
 347 #ifdef HAVE_PTHREAD_H
 348         if (this->mutex) {
 349                 /*
 350                  *      FIXME
 351                  *      The mutex MIGHT be locked...
 352                  *      we'll check for that later, I guess.
 353                  */
 354                 pthread_mutex_destroy(this->mutex);
 355                 talloc_free(this->mutex);
 356         }
 357 #endif
 358
 359         /*
 360          *      Remove any registered paircompares.
 361          */
 362         paircompare_unregister_instance(this->insthandle);
 363
 364         xlat_unregister(this->name, NULL, this->insthandle);
 365
 366 #ifndef NDEBUG
 367         memset(this, 0, sizeof(*this));
 368 #endif
 369         talloc_free(this);
 370 }
 371
 372
 373 /*
 374  *      Compare two module entries
 375  */
 376 static int module_entry_cmp(void const *one, void const *two)
 377 {
 378         module_entry_t const *a = one;
 379         module_entry_t const *b = two;
 380
 381         return strcmp(a->name, b->name);
 382 }
 383
 384 /*
 385  *      Free a module entry.
 386  */
 387 static int module_entry_free(module_entry_t *this)
 388 {
 389 #ifndef NDEBUG
 390         /*
 391          *      Don't dlclose() modules if we're doing memory
 392          *      debugging.  This removes the symbols needed by
 393          *      valgrind.
 394          */
 395         if (!mainconfig.debug_memory)
 396 #endif
 397                 dlclose(this->handle);  /* ignore any errors */
 398         return 0;
 399 }
 400
 401
 402 /*
 403  *      Remove the module lists.
 404  */
 405 int detach_modules(void)
 406 {
 407         rbtree_free(instance_tree);
 408         rbtree_free(module_tree);
 409
 410         return 0;
 411 }
 412
 413
 414 /*
 415  *      Find a module on disk or in memory, and link to it.
 416  */
 417 static module_entry_t *linkto_module(char const *module_name,
 418                                      CONF_SECTION *cs)
 419 {
 420         module_entry_t myentry;
 421         module_entry_t *node;
 422         void *handle = NULL;
 423         module_t const *module;
 424
 425         strlcpy(myentry.name, module_name, sizeof(myentry.name));
 426         node = rbtree_finddata(module_tree, &myentry);
 427         if (node) return node;
 428
 429         /*
 430          *      Link to the module's rlm_FOO{} structure, the same as
 431          *      the module name.
 432          */
 433
 434 #if !defined(WITH_LIBLTDL) && defined(HAVE_DLFCN_H) && defined(RTLD_SELF)
 435         module = dlsym(RTLD_SELF, module_name);
 436         if (module) goto open_self;
 437 #endif
 438
 439         /*
 440          *      Keep the handle around so we can dlclose() it.
 441          */
 442         handle = lt_dlopenext(module_name);
 443         if (!handle) {
 444                 cf_log_err_cs(cs,
 445                            "Failed to link to module '%s': %s\n",
 446                            module_name, dlerror());
 447                 return NULL;
 448         }
 449
 450         DEBUG3("    (Loaded %s, checking if it's valid)", module_name);
 451
 452         /*
 453          *      libltld MAY core here, if the handle it gives us contains
 454          *      garbage data.
 455          */
 456         module = dlsym(handle, module_name);
 457         if (!module) {
 458                 cf_log_err_cs(cs,
 459                            "Failed linking to %s structure: %s\n",
 460                            module_name, dlerror());
 461                 dlclose(handle);
 462                 return NULL;
 463         }
 464
 465 #if !defined(WITH_LIBLTDL) && defined (HAVE_DLFCN_H) && defined(RTLD_SELF)
 466  open_self:
 467 #endif
 468         /*
 469          *      Before doing anything else, check if it's sane.
 470          */
 471         if (check_module_magic(cs, module) < 0) {
 472                 dlclose(handle);
 473                 return NULL;
 474         }
 475
 476         /* make room for the module type */
 477         node = talloc_zero(cs, module_entry_t);
 478         talloc_set_destructor(node, module_entry_free);
 479         strlcpy(node->name, module_name, sizeof(node->name));
 480         node->module = module;
 481         node->handle = handle;
 482
 483         cf_log_module(cs, "Loaded module %s", module_name);
 484
 485         /*
 486          *      Add the module as "rlm_foo-version" to the configuration
 487          *      section.
 488          */
 489         if (!rbtree_insert(module_tree, node)) {
 490                 ERROR("Failed to cache module %s", module_name);
 491                 dlclose(handle);
 492                 talloc_free(node);
 493                 return NULL;
 494         }
 495
 496         return node;
 497 }
 498
 499 /** Parse module's configuration section and setup destructors
 500  *
 501  */
 502 static int module_conf_parse(module_instance_t *node, void **handle)
 503 {
 504         *handle = NULL;
 505
 506         /*
 507          *      If there is supposed to be instance data, allocate it now.
 508          *      Also parse the configuration data, if required.
 509          */
 510         if (node->entry->module->inst_size) {
 511                 /* FIXME: make this rlm_config_t ?? */
 512                 *handle = talloc_zero_array(node, uint8_t, node->entry->module->inst_size);
 513                 rad_assert(handle);
 514
 515                 /*
 516                  *      So we can see where this configuration is from
 517                  *      FIXME: set it to rlm_NAME_t, or some such thing
 518                  */
 519                 talloc_set_name(*handle, "rlm_config_t");
 520
 521                 if (node->entry->module->config &&
 522                     (cf_section_parse(node->cs, *handle, node->entry->module->config) < 0)) {
 523                         cf_log_err_cs(node->cs,"Invalid configuration for module \"%s\"", node->name);
 524                         talloc_free(*handle);
 525
 526                         return -1;
 527                 }
 528
 529                 /*
 530                  *      Set the destructor.
 531                  */
 532                 if (node->entry->module->detach) {
 533                         talloc_set_destructor(*handle, node->entry->module->detach);
 534                 }
 535         }
 536
 537         return 0;
 538 }
 539
 540 /*
 541  *      Find a module instance.
 542  */
 543 module_instance_t *find_module_instance(CONF_SECTION *modules,
 544                                         char const *askedname, int do_link)
 545 {
 546         bool check_config_safe = false;
 547         CONF_SECTION *cs;
 548         char const *name1, *instname;
 549         module_instance_t *node, myNode;
 550         char module_name[256];
 551
 552         if (!modules) return NULL;
 553
 554         /*
 555          *      Look for the real name.  Ignore the first character,
 556          *      which tells the server "it's OK for this module to not
 557          *      exist."
 558          */
 559         instname = askedname;
 560         if (instname[0] == '-') {
 561                 instname++;
 562         }
 563
 564         /*
 565          *      Module instances are declared in the modules{} block
 566          *      and referenced later by their name, which is the
 567          *      name2 from the config section, or name1 if there was
 568          *      no name2.
 569          */
 570         cs = cf_section_sub_find_name2(modules, NULL, instname);
 571         if (!cs) {
 572                 ERROR("Cannot find a configuration entry for module \"%s\"", instname);
 573                 return NULL;
 574         }
 575
 576         /*
 577          *      If there's already a module instance, return it.
 578          */
 579         strlcpy(myNode.name, instname, sizeof(myNode.name));
 580
 581         node = rbtree_finddata(instance_tree, &myNode);
 582         if (node) {
 583                 return node;
 584         }
 585
 586         if (!do_link) {
 587                 return NULL;
 588         }
 589
 590         name1 = cf_section_name1(cs);
 591
 592         /*
 593          *      Found the configuration entry, hang the node struct off of the
 594          *      configuration section. If the CS is free'd the instance will
 595          *      be too.
 596          */
 597         node = talloc_zero(cs, module_instance_t);
 598         node->cs = cs;
 599
 600         /*
 601          *      Names in the "modules" section aren't prefixed
 602          *      with "rlm_", so we add it here.
 603          */
 604         snprintf(module_name, sizeof(module_name), "rlm_%s", name1);
 605
 606         /*
 607          *      Pull in the module object
 608          */
 609         node->entry = linkto_module(module_name, cs);
 610         if (!node->entry) {
 611                 talloc_free(node);
 612                 /* linkto_module logs any errors */
 613                 return NULL;
 614         }
 615
 616         if (check_config && (node->entry->module->instantiate) &&
 617             (node->entry->module->type & RLM_TYPE_CHECK_CONFIG_SAFE) == 0) {
 618                 char const *value = NULL;
 619                 CONF_PAIR *cp;
 620
 621                 cp = cf_pair_find(cs, "force_check_config");
 622                 if (cp) {
 623                         value = cf_pair_value(cp);
 624                 }
 625
 626                 if (value && (strcmp(value, "yes") == 0)) goto print_inst;
 627
 628                 cf_log_module(cs, "Skipping instantiation of %s", instname);
 629         } else {
 630         print_inst:
 631                 check_config_safe = true;
 632                 cf_log_module(cs, "Instantiating module \"%s\" from file %s", instname,
 633                               cf_section_filename(cs));
 634         }
 635
 636         strlcpy(node->name, instname, sizeof(node->name));
 637
 638         /*
 639          *      Parse the module configuration, and setup destructors so the
 640          *      module's detach method is called when it's instance data is
 641          *      about to be freed.
 642          */
 643         if (module_conf_parse(node, &node->insthandle) < 0) {
 644                 talloc_free(node);
 645
 646                 return NULL;
 647         }
 648
 649         /*
 650          *      Call the module's instantiation routine.
 651          */
 652         if ((node->entry->module->instantiate) &&
 653             (!check_config || check_config_safe) &&
 654             ((node->entry->module->instantiate)(cs, node->insthandle) < 0)) {
 655                 cf_log_err_cs(cs, "Instantiation failed for module \"%s\"", node->name);
 656                 talloc_free(node);
 657
 658                 return NULL;
 659         }
 660
 661 #ifdef HAVE_PTHREAD_H
 662         /*
 663          *      If we're threaded, check if the module is thread-safe.
 664          *
 665          *      If it isn't, we create a mutex.
 666          */
 667         if ((node->entry->module->type & RLM_TYPE_THREAD_UNSAFE) != 0) {
 668                 node->mutex = talloc_zero(node, pthread_mutex_t);
 669
 670                 /*
 671                  *      Initialize the mutex.
 672                  */
 673                 pthread_mutex_init(node->mutex, NULL);
 674         } else {
 675                 /*
 676                  *      The module is thread-safe.  Don't give it a mutex.
 677                  */
 678                 node->mutex = NULL;
 679         }
 680
 681 #endif
 682         rbtree_insert(instance_tree, node);
 683
 684         return node;
 685 }
 686
 687 static indexed_modcallable *lookup_by_index(rbtree_t *components,
 688                                             rlm_components_t comp, int idx)
 689 {
 690         indexed_modcallable myc;
 691
 692         myc.comp = comp;
 693         myc.idx = idx;
 694
 695         return rbtree_finddata(components, &myc);
 696 }
 697
 698 /*
 699  *      Create a new sublist.
 700  */
 701 static indexed_modcallable *new_sublist(CONF_SECTION *cs,
 702                                         rbtree_t *components, rlm_components_t comp, int idx)
 703 {
 704         indexed_modcallable *c;
 705
 706         c = lookup_by_index(components, comp, idx);
 707
 708         /* It is an error to try to create a sublist that already
 709          * exists. It would almost certainly be caused by accidental
 710          * duplication in the config file.
 711          *
 712          * index 0 is the exception, because it is used when we want
 713          * to collect _all_ listed modules under a single index by
 714          * default, which is currently the case in all components
 715          * except authenticate. */
 716         if (c) {
 717                 if (idx == 0) {
 718                         return c;
 719                 }
 720                 return NULL;
 721         }
 722
 723         c = talloc_zero(cs, indexed_modcallable);
 724         c->modulelist = NULL;
 725         c->comp = comp;
 726         c->idx = idx;
 727
 728         if (!rbtree_insert(components, c)) {
 729                 talloc_free(c);
 730                 return NULL;
 731         }
 732
 733         talloc_set_destructor(c, indexed_modcallable_free);
 734
 735         return c;
 736 }
 737
 738 rlm_rcode_t indexed_modcall(rlm_components_t comp, int idx, REQUEST *request)
 739 {
 740         rlm_rcode_t rcode;
 741         modcallable *list = NULL;
 742         virtual_server_t *server;
 743
 744         /*
 745          *      Hack to find the correct virtual server.
 746          */
 747         server = virtual_server_find(request->server);
 748         if (!server) {
 749                 RDEBUG("No such virtual server \"%s\"", request->server);
 750                 return RLM_MODULE_FAIL;
 751         }
 752
 753         if (idx == 0) {
 754                 list = server->mc[comp];
 755                 if (!list) RWDEBUG2("Empty %s section.  Using default return values.", section_type_value[comp].section);
 756
 757         } else {
 758                 indexed_modcallable *this;
 759
 760                 this = lookup_by_index(server->components, comp, idx);
 761                 if (this) {
 762                         list = this->modulelist;
 763                 } else {
 764                         RWDEBUG2("Unknown value specified for %s.  Cannot perform requested action.",
 765                                 section_type_value[comp].typename);
 766                 }
 767         }
 768
 769         if (server->subcs[comp]) {
 770                 if (idx == 0) {
 771                         RDEBUG("# Executing section %s from file %s",
 772                                section_type_value[comp].section,
 773                                cf_section_filename(server->subcs[comp]));
 774                 } else {
 775                         RDEBUG("# Executing group from file %s",
 776                                cf_section_filename(server->subcs[comp]));
 777                 }
 778         }
 779         request->component = section_type_value[comp].section;
 780
 781         rcode = modcall(comp, list, request);
 782
 783         request->module = "";
 784         request->component = "<core>";
 785         return rcode;
 786 }
 787
 788 /*
 789  *      Load a sub-module list, as found inside an Auth-Type foo {}
 790  *      block
 791  */
 792 static int load_subcomponent_section(modcallable *parent, CONF_SECTION *cs,
 793                                      rbtree_t *components,
 794                                      DICT_ATTR const *dattr, rlm_components_t comp)
 795 {
 796         indexed_modcallable *subcomp;
 797         modcallable *ml;
 798         DICT_VALUE *dval;
 799         char const *name2 = cf_section_name2(cs);
 800
 801         /*
 802          *      Sanity check.
 803          */
 804         if (!name2) {
 805                 return 1;
 806         }
 807
 808         /*
 809          *      Compile the group.
 810          */
 811         ml = compile_modgroup(parent, comp, cs);
 812         if (!ml) {
 813                 return 0;
 814         }
 815
 816         /*
 817          *      We must assign a numeric index to this subcomponent.
 818          *      It is generated and placed in the dictionary
 819          *      automatically.  If it isn't found, it's a serious
 820          *      error.
 821          */
 822         dval = dict_valbyname(dattr->attr, dattr->vendor, name2);
 823         if (!dval) {
 824                 cf_log_err_cs(cs,
 825                            "%s %s Not previously configured",
 826                            section_type_value[comp].typename, name2);
 827                 modcallable_free(&ml);
 828                 return 0;
 829         }
 830
 831         subcomp = new_sublist(cs, components, comp, dval->value);
 832         if (!subcomp) {
 833                 modcallable_free(&ml);
 834                 return 1;
 835         }
 836
 837         subcomp->modulelist = ml;
 838         return 1;               /* OK */
 839 }
 840
 841 static int define_type(CONF_SECTION *cs, DICT_ATTR const *dattr, char const *name)
 842 {
 843         uint32_t value;
 844         DICT_VALUE *dval;
 845
 846         /*
 847          *      If the value already exists, don't
 848          *      create it again.
 849          */
 850         dval = dict_valbyname(dattr->attr, dattr->vendor, name);
 851         if (dval) return 1;
 852
 853         /*
 854          *      Create a new unique value with a
 855          *      meaningless number.  You can't look at
 856          *      it from outside of this code, so it
 857          *      doesn't matter.  The only requirement
 858          *      is that it's unique.
 859          */
 860         do {
 861                 value = fr_rand() & 0x00ffffff;
 862         } while (dict_valbyattr(dattr->attr, dattr->vendor, value));
 863
 864         cf_log_module(cs, "Creating %s = %s", dattr->name, name);
 865         if (dict_addvalue(name, dattr->name, value) < 0) {
 866                 ERROR("%s", fr_strerror());
 867                 return 0;
 868         }
 869
 870         return 1;
 871 }
 872
 873 static int load_component_section(CONF_SECTION *cs,
 874                                   rbtree_t *components, rlm_components_t comp)
 875 {
 876         modcallable *this;
 877         CONF_ITEM *modref;
 878         int idx;
 879         indexed_modcallable *subcomp;
 880         char const *modname;
 881         char const *visiblename;
 882         DICT_ATTR const *dattr;
 883
 884         /*
 885          *      Find the attribute used to store VALUEs for this section.
 886          */
 887         dattr = dict_attrbyvalue(section_type_value[comp].attr, 0);
 888         if (!dattr) {
 889                 cf_log_err_cs(cs,
 890                            "No such attribute %s",
 891                            section_type_value[comp].typename);
 892                 return -1;
 893         }
 894
 895         /*
 896          *      Loop over the entries in the named section, loading
 897          *      the sections this time.
 898          */
 899         for (modref = cf_item_find_next(cs, NULL);
 900              modref != NULL;
 901              modref = cf_item_find_next(cs, modref)) {
 902                 char const *name1;
 903                 CONF_PAIR *cp = NULL;
 904                 CONF_SECTION *scs = NULL;
 905
 906                 if (cf_item_is_section(modref)) {
 907                         scs = cf_itemtosection(modref);
 908
 909                         name1 = cf_section_name1(scs);
 910
 911                         if (strcmp(name1,
 912                                    section_type_value[comp].typename) == 0) {
 913                                 if (!load_subcomponent_section(NULL, scs,
 914                                                                components,
 915                                                                dattr,
 916                                                                comp)) {
 917                                         return -1; /* FIXME: memleak? */
 918                                 }
 919                                 continue;
 920                         }
 921
 922                         cp = NULL;
 923
 924                         /*
 925                          *      Skip commented-out sections.
 926                          *
 927                          *      We skip an "if" ONLY when there's no
 928                          *      "else" after it, as the run-time
 929                          *      interpretor needs the results of the
 930                          *      previous "if".
 931                          */
 932                         if (strcmp(name1, "if") == 0) {
 933                                 fr_cond_t const *c;
 934                                 CONF_ITEM *next_ci;
 935
 936                                 next_ci = cf_item_find_next(scs, modref);
 937                                 if (next_ci && cf_item_is_section(next_ci)) {
 938                                         char const *next_name;
 939                                         CONF_SECTION *next_cs;
 940
 941                                         next_cs = cf_itemtosection(next_ci);
 942                                         next_name = cf_section_name1(next_cs);
 943                                         if ((strcmp(next_name, "else") == 0) ||
 944                                             (strcmp(next_name, "elseif") == 0)) {
 945                                                 c = NULL;
 946                                         } else {
 947                                                 c = cf_data_find(scs, "if");
 948                                         }
 949                                 } else {
 950                                         c = cf_data_find(scs, "if");
 951                                 }
 952
 953                                 if (c && c->type == COND_TYPE_FALSE) {
 954                                         DEBUG(" # Skipping contents of '%s' at %s:%d as it statically evaluates to 'false'",
 955                                              name1, cf_section_filename(scs), cf_section_lineno(scs));
 956                                         continue;
 957                                 }
 958                         }
 959
 960
 961                 } else if (cf_item_is_pair(modref)) {
 962                         cp = cf_itemtopair(modref);
 963
 964                 } else {
 965                         continue; /* ignore it */
 966                 }
 967
 968                 /*
 969                  *      Try to compile one entry.
 970                  */
 971                 this = compile_modsingle(NULL, comp, modref, &modname);
 972
 973                 /*
 974                  *      It's OK for the module to not exist.
 975                  */
 976                 if (!this && modname && (modname[0] == '-')) {
 977                         WDEBUG("Ignoring \"%s\" (see raddb/mods-available/README.rst)", modname + 1);
 978                         continue;
 979                 }
 980
 981                 if (!this) {
 982                         cf_log_err_cs(cs,
 983                                    "Errors parsing %s section.\n",
 984                                    cf_section_name1(cs));
 985                         return -1;
 986                 }
 987
 988                 /*
 989                  *      Look for Auth-Type foo {}, which are special
 990                  *      cases of named sections, and allowable ONLY
 991                  *      at the top-level.
 992                  *
 993                  *      i.e. They're not allowed in a "group" or "redundant"
 994                  *      subsection.
 995                  */
 996                 if (comp == RLM_COMPONENT_AUTH) {
 997                         DICT_VALUE *dval;
 998                         char const *modrefname = NULL;
 999                         if (cp) {
1000                                 modrefname = cf_pair_attr(cp);
1001                         } else {
1002                                 modrefname = cf_section_name2(scs);
1003                                 if (!modrefname) {
1004                                         modcallable_free(&this);
1005                                         cf_log_err_cs(cs,
1006                                                    "Errors parsing %s sub-section.\n",
1007                                                    cf_section_name1(scs));
1008                                         return -1;
1009                                 }
1010                         }
1011
1012                         dval = dict_valbyname(PW_AUTH_TYPE, 0, modrefname);
1013                         if (!dval) {
1014                                 /*
1015                                  *      It's a section, but nothing we
1016                                  *      recognize.  Die!
1017                                  */
1018                                 modcallable_free(&this);
1019                                 cf_log_err_cs(cs,
1020                                            "Unknown Auth-Type \"%s\" in %s sub-section.",
1021                                            modrefname, section_type_value[comp].section);
1022                                 return -1;
1023                         }
1024                         idx = dval->value;
1025                 } else {
1026                         /* See the comment in new_sublist() for explanation
1027                          * of the special index 0 */
1028                         idx = 0;
1029                 }
1030
1031                 subcomp = new_sublist(cs, components, comp, idx);
1032                 if (subcomp == NULL) {
1033                         modcallable_free(&this);
1034                         continue;
1035                 }
1036
1037                 /* If subcomp->modulelist is NULL, add_to_modcallable will
1038                  * create it */
1039                 visiblename = cf_section_name2(cs);
1040                 if (visiblename == NULL)
1041                         visiblename = cf_section_name1(cs);
1042                 add_to_modcallable(&subcomp->modulelist, this,
1043                                    comp, visiblename);
1044         }
1045
1046         return 0;
1047 }
1048
1049 static int load_byserver(CONF_SECTION *cs)
1050 {
1051         rlm_components_t comp, found;
1052         char const *name = cf_section_name2(cs);
1053         rbtree_t *components;
1054         virtual_server_t *server = NULL;
1055         indexed_modcallable *c;
1056
1057         if (name) {
1058                 cf_log_info(cs, "server %s { # from file %s",
1059                             name, cf_section_filename(cs));
1060         } else {
1061                 cf_log_info(cs, "server { # from file %s",
1062                             cf_section_filename(cs));
1063         }
1064
1065         components = rbtree_create(indexed_modcallable_cmp, NULL, 0);
1066         if (!components) {
1067                 ERROR("Failed to initialize components\n");
1068                 goto error;
1069         }
1070
1071         server = talloc_zero(cs, virtual_server_t);
1072         server->name = name;
1073         server->created = time(NULL);
1074         server->cs = cs;
1075         server->components = components;
1076         talloc_set_destructor(server, virtual_server_free);
1077
1078         /*
1079          *      Define types first.
1080          */
1081         for (comp = 0; comp < RLM_COMPONENT_COUNT; ++comp) {
1082                 CONF_SECTION *subcs;
1083                 CONF_ITEM *modref;
1084                 DICT_ATTR const *dattr;
1085
1086                 subcs = cf_section_sub_find(cs,
1087                                             section_type_value[comp].section);
1088                 if (!subcs) continue;
1089
1090                 if (cf_item_find_next(subcs, NULL) == NULL) continue;
1091
1092                 /*
1093                  *      Find the attribute used to store VALUEs for this section.
1094                  */
1095                 dattr = dict_attrbyvalue(section_type_value[comp].attr, 0);
1096                 if (!dattr) {
1097                         cf_log_err_cs(subcs,
1098                                    "No such attribute %s",
1099                                    section_type_value[comp].typename);
1100                 error:
1101                         if (debug_flag == 0) {
1102                                 ERROR("Failed to load virtual server %s",
1103                                        (name != NULL) ? name : "<default>");
1104                         }
1105                         talloc_free(server);
1106                         return -1;
1107                 }
1108
1109                 /*
1110                  *      Define dynamic types, so that others can reference
1111                  *      them.
1112                  */
1113                 for (modref = cf_item_find_next(subcs, NULL);
1114                      modref != NULL;
1115                      modref = cf_item_find_next(subcs, modref)) {
1116                         char const *name1;
1117                         CONF_SECTION *subsubcs;
1118
1119                         /*
1120                          *      Create types for simple references
1121                          *      only when parsing the authenticate
1122                          *      section.
1123                          */
1124                         if ((section_type_value[comp].attr == PW_AUTH_TYPE) &&
1125                             cf_item_is_pair(modref)) {
1126                                 CONF_PAIR *cp = cf_itemtopair(modref);
1127                                 if (!define_type(cs, dattr, cf_pair_attr(cp))) {
1128                                         goto error;
1129                                 }
1130
1131                                 continue;
1132                         }
1133
1134                         if (!cf_item_is_section(modref)) continue;
1135
1136                         subsubcs = cf_itemtosection(modref);
1137                         name1 = cf_section_name1(subsubcs);
1138
1139                         if (strcmp(name1, section_type_value[comp].typename) == 0) {
1140                           if (!define_type(cs, dattr,
1141                                            cf_section_name2(subsubcs))) {
1142                                         goto error;
1143                                 }
1144                         }
1145                 }
1146         } /* loop over components */
1147
1148         /*
1149          *      Loop over all of the known components, finding their
1150          *      configuration section, and loading it.
1151          */
1152         found = 0;
1153         for (comp = 0; comp < RLM_COMPONENT_COUNT; ++comp) {
1154                 CONF_SECTION *subcs;
1155
1156                 subcs = cf_section_sub_find(cs,
1157                                             section_type_value[comp].section);
1158                 if (!subcs) continue;
1159
1160                 if (cf_item_find_next(subcs, NULL) == NULL) continue;
1161
1162                 cf_log_module(cs, "Loading %s {...}",
1163                               section_type_value[comp].section);
1164
1165                 /*
1166                  *      Skip pre/post-proxy sections if we're not
1167                  *      proxying.
1168                  */
1169                 if (
1170 #ifdef WITH_PROXY
1171                     !mainconfig.proxy_requests &&
1172 #endif
1173                     ((comp == RLM_COMPONENT_PRE_PROXY) ||
1174                      (comp == RLM_COMPONENT_POST_PROXY))) {
1175                         continue;
1176                 }
1177
1178 #ifndef WITH_ACCOUNTING
1179                 if (comp == RLM_COMPONENT_ACCT) continue;
1180 #endif
1181
1182 #ifndef WITH_SESSION_MGMT
1183                 if (comp == RLM_COMPONENT_SESS) continue;
1184 #endif
1185
1186                 if (load_component_section(subcs, components, comp) < 0) {
1187                         goto error;
1188                 }
1189
1190                 /*
1191                  *      Cache a default, if it exists.  Some people
1192                  *      put empty sections for some reason...
1193                  */
1194                 c = lookup_by_index(components, comp, 0);
1195                 if (c) server->mc[comp] = c->modulelist;
1196
1197                 server->subcs[comp] = subcs;
1198
1199                 found = 1;
1200         } /* loop over components */
1201
1202         /*
1203          *      We haven't loaded any of the normal sections.  Maybe we're
1204          *      supposed to load the vmps section.
1205          *
1206          *      This is a bit of a hack...
1207          */
1208         if (!found) do {
1209                 CONF_SECTION *subcs;
1210 #ifdef WITH_DHCP
1211                 DICT_ATTR const *dattr;
1212 #endif
1213
1214                 subcs = cf_section_sub_find(cs, "vmps");
1215                 if (subcs) {
1216                         cf_log_module(cs, "Checking vmps {...} for more modules to load");
1217                         if (load_component_section(subcs, components,
1218                                                    RLM_COMPONENT_POST_AUTH) < 0) {
1219                                 goto error;
1220                         }
1221                         c = lookup_by_index(components,
1222                                             RLM_COMPONENT_POST_AUTH, 0);
1223                         if (c) server->mc[RLM_COMPONENT_POST_AUTH] = c->modulelist;
1224                         found = 1;
1225                         break;
1226                 }
1227
1228 #ifdef WITH_DHCP
1229                 subcs = cf_subsection_find_next(cs, NULL, "dhcp");
1230                 dattr = dict_attrbyname("DHCP-Message-Type");
1231                 if (!dattr && subcs) {
1232                         cf_log_err_cs(subcs, "Found a 'dhcp' section, but no DHCP dictionaries have been loaded");
1233                         goto error;
1234                 }
1235
1236                 if (!dattr) break;
1237
1238                 /*
1239                  *      Handle each DHCP Message type separately.
1240                  */
1241                 while (subcs) {
1242                         char const *name2 = cf_section_name2(subcs);
1243
1244                         DEBUG2(" Module: Checking dhcp %s {...} for more modules to load", name2);
1245                         if (!load_subcomponent_section(NULL, subcs,
1246                                                        components,
1247                                                        dattr,
1248                                                        RLM_COMPONENT_POST_AUTH)) {
1249                                 goto error; /* FIXME: memleak? */
1250                         }
1251                         c = lookup_by_index(components,
1252                                             RLM_COMPONENT_POST_AUTH, 0);
1253                         if (c) server->mc[RLM_COMPONENT_POST_AUTH] = c->modulelist;
1254                         found = 1;
1255
1256                         subcs = cf_subsection_find_next(cs, subcs, "dhcp");
1257                 }
1258 #endif
1259         } while (0);
1260
1261         if (name) {
1262                 cf_log_info(cs, "} # server %s", name);
1263         } else {
1264                 cf_log_info(cs, "} # server");
1265         }
1266
1267         if (!found && name) {
1268                 WDEBUG("Server %s is empty, and will do nothing!",
1269                       name);
1270         }
1271
1272         if (debug_flag == 0) {
1273                 INFO("Loaded virtual server %s",
1274                        (name != NULL) ? name : "<default>");
1275         }
1276
1277         /*
1278          *      Now that it is OK, insert it into the list.
1279          *
1280          *      This is thread-safe...
1281          */
1282         comp = virtual_server_idx(name);
1283         server->next = virtual_servers[comp];
1284         virtual_servers[comp] = server;
1285
1286         /*
1287          *      Mark OLDER ones of the same name as being unused.
1288          */
1289         server = server->next;
1290         while (server) {
1291                 if ((!name && !server->name) ||
1292                     (name && server->name &&
1293                      (strcmp(server->name, name) == 0))) {
1294                         server->can_free = true;
1295                         break;
1296                 }
1297                 server = server->next;
1298         }
1299
1300         return 0;
1301 }
1302
1303
1304 /*
1305  *      Load all of the virtual servers.
1306  */
1307 int virtual_servers_load(CONF_SECTION *config)
1308 {
1309         CONF_SECTION *cs;
1310         virtual_server_t *server;
1311         static int first_time = true;
1312
1313         DEBUG2("%s: #### Loading Virtual Servers ####", mainconfig.name);
1314
1315         /*
1316          *      If we have "server { ...}", then there SHOULD NOT be
1317          *      bare "authorize", etc. sections.  if there is no such
1318          *      server, then try to load the old-style sections first.
1319          *
1320          *      In either case, load the "default" virtual server first.
1321          *      this matches better with users expectations.
1322          */
1323         cs = cf_section_find_name2(cf_subsection_find_next(config, NULL,
1324                                                            "server"),
1325                                    "server", NULL);
1326         if (cs) {
1327                 if (load_byserver(cs) < 0) {
1328                         return -1;
1329                 }
1330         } else {
1331                 if (load_byserver(config) < 0) {
1332                         return -1;
1333                 }
1334         }
1335
1336         /*
1337          *      Load all of the virtual servers.
1338          */
1339         for (cs = cf_subsection_find_next(config, NULL, "server");
1340              cs != NULL;
1341              cs = cf_subsection_find_next(config, cs, "server")) {
1342                 char const *name2;
1343
1344                 name2 = cf_section_name2(cs);
1345                 if (!name2) continue; /* handled above */
1346
1347                 server = virtual_server_find(name2);
1348                 if (server &&
1349                     (cf_top_section(server->cs) == config)) {
1350                         ERROR("Duplicate virtual server \"%s\" in file %s:%d and file %s:%d",
1351                                server->name,
1352                                cf_section_filename(server->cs),
1353                                cf_section_lineno(server->cs),
1354                                cf_section_filename(cs),
1355                                cf_section_lineno(cs));
1356                         return -1;
1357                 }
1358
1359                 if (load_byserver(cs) < 0) {
1360                         /*
1361                          *      Once we successfully started once,
1362                          *      continue loading the OTHER servers,
1363                          *      even if one fails.
1364                          */
1365                         if (!first_time) continue;
1366                         return -1;
1367                 }
1368         }
1369
1370         /*
1371          *      Now that we've loaded everything, run pass 2 over the
1372          *      conditions and xlats.
1373          */
1374         for (cs = cf_subsection_find_next(config, NULL, "server");
1375              cs != NULL;
1376              cs = cf_subsection_find_next(config, cs, "server")) {
1377                 int i;
1378                 char const *name2;
1379
1380                 name2 = cf_section_name2(cs);
1381
1382                 server = virtual_server_find(name2);
1383                 if (!server) continue;
1384
1385                 for (i = RLM_COMPONENT_AUTH; i < RLM_COMPONENT_COUNT; i++) {
1386                         if (!modcall_pass2(server->mc[i])) return -1;
1387                 }
1388         }
1389
1390         /*
1391          *      If we succeed the first time around, remember that.
1392          */
1393         first_time = false;
1394
1395         return 0;
1396 }
1397
1398 int module_hup_module(CONF_SECTION *cs, module_instance_t *node, time_t when)
1399 {
1400         void *insthandle;
1401         fr_module_hup_t *mh;
1402
1403         if (!node ||
1404             !node->entry->module->instantiate ||
1405             ((node->entry->module->type & RLM_TYPE_HUP_SAFE) == 0)) {
1406                 return 1;
1407         }
1408
1409         cf_log_module(cs, "Trying to reload module \"%s\"", node->name);
1410
1411         /*
1412          *      Parse the module configuration, and setup destructors so the
1413          *      module's detach method is called when it's instance data is
1414          *      about to be freed.
1415          */
1416         if (module_conf_parse(node, &insthandle) < 0) {
1417                 cf_log_err_cs(cs, "HUP failed for module \"%s\" (parsing config failed). "
1418                               "Using old configuration", node->name);
1419
1420                 return 0;
1421         }
1422
1423         if ((node->entry->module->instantiate)(cs, insthandle) < 0) {
1424                 cf_log_err_cs(cs, "HUP failed for module \"%s\".  Using old configuration.", node->name);
1425                 talloc_free(insthandle);
1426
1427                 return 0;
1428         }
1429
1430         INFO(" Module: Reloaded module \"%s\"", node->name);
1431
1432         module_instance_free_old(cs, node, when);
1433
1434         /*
1435          *      Save the old instance handle for later deletion.
1436          */
1437         mh = talloc_zero(cs, fr_module_hup_t);
1438         mh->mi = node;
1439         mh->when = when;
1440         mh->insthandle = node->insthandle;
1441         mh->next = node->mh;
1442         node->mh = mh;
1443
1444         node->insthandle = insthandle;
1445
1446         /*
1447          *      FIXME: Set a timeout to come back in 60s, so that
1448          *      we can pro-actively clean up the old instances.
1449          */
1450
1451         return 1;
1452 }
1453
1454
1455 int module_hup(CONF_SECTION *modules)
1456 {
1457         time_t when;
1458         CONF_ITEM *ci;
1459         CONF_SECTION *cs;
1460         module_instance_t *node;
1461
1462         if (!modules) return 0;
1463
1464         when = time(NULL);
1465
1466         /*
1467          *      Loop over the modules
1468          */
1469         for (ci=cf_item_find_next(modules, NULL);
1470              ci != NULL;
1471              ci=cf_item_find_next(modules, ci)) {
1472                 char const *instname;
1473                 module_instance_t myNode;
1474
1475                 /*
1476                  *      If it's not a section, ignore it.
1477                  */
1478                 if (!cf_item_is_section(ci)) continue;
1479
1480                 cs = cf_itemtosection(ci);
1481                 instname = cf_section_name2(cs);
1482                 if (!instname) instname = cf_section_name1(cs);
1483
1484                 strlcpy(myNode.name, instname, sizeof(myNode.name));
1485                 node = rbtree_finddata(instance_tree, &myNode);
1486
1487                 module_hup_module(cs, node, when);
1488         }
1489
1490         return 1;
1491 }
1492
1493
1494 /*
1495  *      Parse the module config sections, and load
1496  *      and call each module's init() function.
1497  *
1498  *      Libtool makes your life a LOT easier, especially with libltdl.
1499  *      see: http://www.gnu.org/software/libtool/
1500  */
1501 int setup_modules(int reload, CONF_SECTION *config)
1502 {
1503         CONF_ITEM       *ci, *next;
1504         CONF_SECTION    *cs, *modules;
1505         rad_listen_t    *listener;
1506
1507         if (reload) return 0;
1508
1509         /*
1510          *      If necessary, initialize libltdl.
1511          */
1512         if (!reload) {
1513                 /*
1514                  *      Set up the internal module struct.
1515                  */
1516                 module_tree = rbtree_create(module_entry_cmp, NULL, 0);
1517                 if (!module_tree) {
1518                         ERROR("Failed to initialize modules\n");
1519                         return -1;
1520                 }
1521
1522                 instance_tree = rbtree_create(module_instance_cmp,
1523                                               module_instance_free, 0);
1524                 if (!instance_tree) {
1525                         ERROR("Failed to initialize modules\n");
1526                         return -1;
1527                 }
1528         }
1529
1530         memset(virtual_servers, 0, sizeof(virtual_servers));
1531
1532         /*
1533          *      Remember where the modules were stored.
1534          */
1535         modules = cf_section_sub_find(config, "modules");
1536         if (!modules) {
1537                 WARN("Cannot find a \"modules\" section in the configuration file!");
1538         }
1539
1540         DEBUG2("%s: #### Instantiating modules ####", mainconfig.name);
1541
1542         /*
1543          *      Loop over module definitions, looking for duplicates.
1544          *
1545          *      This is O(N^2) in the number of modules, but most
1546          *      systems should have less than 100 modules.
1547          */
1548         for (ci=cf_item_find_next(modules, NULL);
1549              ci != NULL;
1550              ci=next) {
1551                 char const *name1, *name2;
1552                 CONF_SECTION *subcs, *duplicate;
1553
1554                 next = cf_item_find_next(modules, ci);
1555
1556                 if (!cf_item_is_section(ci)) continue;
1557
1558                 if (!next || !cf_item_is_section(next)) continue;
1559
1560                 subcs = cf_itemtosection(ci);
1561                 name1 = cf_section_name1(subcs);
1562                 name2 = cf_section_name2(subcs);
1563
1564                 duplicate = cf_section_find_name2(cf_itemtosection(next),
1565                                                   name1, name2);
1566                 if (!duplicate) continue;
1567
1568                 if (!name2) name2 = "";
1569
1570                 ERROR("Duplicate module \"%s %s\", in file %s:%d and file %s:%d",
1571                        name1, name2,
1572                        cf_section_filename(subcs),
1573                        cf_section_lineno(subcs),
1574                        cf_section_filename(duplicate),
1575                        cf_section_lineno(duplicate));
1576                 return -1;
1577         }
1578
1579         /*
1580          *  Look for the 'instantiate' section, which tells us
1581          *  the instantiation order of the modules, and also allows
1582          *  us to load modules with no authorize/authenticate/etc.
1583          *  sections.
1584          */
1585         cs = cf_section_sub_find(config, "instantiate");
1586         if (cs != NULL) {
1587                 CONF_PAIR *cp;
1588                 module_instance_t *module;
1589                 char const *name;
1590
1591                 cf_log_info(cs, " instantiate {");
1592
1593                 /*
1594                  *  Loop over the items in the 'instantiate' section.
1595                  */
1596                 for (ci=cf_item_find_next(cs, NULL);
1597                      ci != NULL;
1598                      ci=cf_item_find_next(cs, ci)) {
1599
1600                         /*
1601                          *      Skip sections and "other" stuff.
1602                          *      Sections will be handled later, if
1603                          *      they're referenced at all...
1604                          */
1605                         if (!cf_item_is_pair(ci)) {
1606                                 continue;
1607                         }
1608
1609                         cp = cf_itemtopair(ci);
1610                         name = cf_pair_attr(cp);
1611                         module = find_module_instance(modules, name, 1);
1612                         if (!module && (name[0] != '-')) {
1613                                 return -1;
1614                         }
1615                 } /* loop over items in the subsection */
1616
1617                 cf_log_info(cs, " }");
1618         } /* if there's an 'instantiate' section. */
1619
1620         /*
1621          *      Now that we've loaded the explicitly ordered modules,
1622          *      load everything in the "modules" section.  This is
1623          *      because we've now split up the modules into
1624          *      mods-enabled.
1625          */
1626         cf_log_info(cs, " modules {");
1627         for (ci=cf_item_find_next(modules, NULL);
1628              ci != NULL;
1629              ci=next) {
1630                 char const *name;
1631                 module_instance_t *module;
1632                 CONF_SECTION *subcs;
1633
1634                 next = cf_item_find_next(modules, ci);
1635
1636                 if (!cf_item_is_section(ci)) continue;
1637
1638                 subcs = cf_itemtosection(ci);
1639                 name = cf_section_name2(subcs);
1640                 if (!name) name = cf_section_name1(subcs);
1641
1642                 module = find_module_instance(modules, name, 1);
1643                 if (!module) return -1;
1644         }
1645         cf_log_info(cs, " } # modules");
1646
1647         /*
1648          *      Loop over the listeners, figuring out which sections
1649          *      to load.
1650          */
1651         for (listener = mainconfig.listen;
1652              listener != NULL;
1653              listener = listener->next) {
1654                 char buffer[256];
1655
1656 #ifdef WITH_PROXY
1657                 if (listener->type == RAD_LISTEN_PROXY) continue;
1658 #endif
1659
1660                 cs = cf_section_sub_find_name2(config,
1661                                                "server", listener->server);
1662                 if (!cs && (listener->server != NULL)) {
1663                         listener->print(listener, buffer, sizeof(buffer));
1664
1665                         ERROR("No server has been defined for %s", buffer);
1666                         return -1;
1667                 }
1668         }
1669
1670         if (virtual_servers_load(config) < 0) return -1;
1671
1672         return 0;
1673 }
1674
1675 /*
1676  *      Call all authorization modules until one returns
1677  *      somethings else than RLM_MODULE_OK
1678  */
1679 rlm_rcode_t process_authorize(int autz_type, REQUEST *request)
1680 {
1681         return indexed_modcall(RLM_COMPONENT_AUTZ, autz_type, request);
1682 }
1683
1684 /*
1685  *      Authenticate a user/password with various methods.
1686  */
1687 rlm_rcode_t process_authenticate(int auth_type, REQUEST *request)
1688 {
1689         return indexed_modcall(RLM_COMPONENT_AUTH, auth_type, request);
1690 }
1691
1692 #ifdef WITH_ACCOUNTING
1693 /*
1694  *      Do pre-accounting for ALL configured sessions
1695  */
1696 rlm_rcode_t module_preacct(REQUEST *request)
1697 {
1698         return indexed_modcall(RLM_COMPONENT_PREACCT, 0, request);
1699 }
1700
1701 /*
1702  *      Do accounting for ALL configured sessions
1703  */
1704 rlm_rcode_t process_accounting(int acct_type, REQUEST *request)
1705 {
1706         return indexed_modcall(RLM_COMPONENT_ACCT, acct_type, request);
1707 }
1708 #endif
1709
1710 #ifdef WITH_SESSION_MGMT
1711 /*
1712  *      See if a user is already logged in.
1713  *
1714  *      Returns: 0 == OK, 1 == double logins, 2 == multilink attempt
1715  */
1716 int process_checksimul(int sess_type, REQUEST *request, int maxsimul)
1717 {
1718         rlm_rcode_t rcode;
1719
1720         if(!request->username)
1721                 return 0;
1722
1723         request->simul_count = 0;
1724         request->simul_max = maxsimul;
1725         request->simul_mpp = 1;
1726
1727         rcode = indexed_modcall(RLM_COMPONENT_SESS, sess_type, request);
1728
1729         if (rcode != RLM_MODULE_OK) {
1730                 /* FIXME: Good spot for a *rate-limited* warning to the log */
1731                 return 0;
1732         }
1733
1734         return (request->simul_count < maxsimul) ? 0 : request->simul_mpp;
1735 }
1736 #endif
1737
1738 #ifdef WITH_PROXY
1739 /*
1740  *      Do pre-proxying for ALL configured sessions
1741  */
1742 rlm_rcode_t process_pre_proxy(int type, REQUEST *request)
1743 {
1744         return indexed_modcall(RLM_COMPONENT_PRE_PROXY, type, request);
1745 }
1746
1747 /*
1748  *      Do post-proxying for ALL configured sessions
1749  */
1750 rlm_rcode_t process_post_proxy(int type, REQUEST *request)
1751 {
1752         return indexed_modcall(RLM_COMPONENT_POST_PROXY, type, request);
1753 }
1754 #endif
1755
1756 /*
1757  *      Do post-authentication for ALL configured sessions
1758  */
1759 rlm_rcode_t process_post_auth(int postauth_type, REQUEST *request)
1760 {
1761         return indexed_modcall(RLM_COMPONENT_POST_AUTH, postauth_type, request);
1762 }
1763
1764 #ifdef WITH_COA
1765 rlm_rcode_t process_recv_coa(int recv_coa_type, REQUEST *request)
1766 {
1767         return indexed_modcall(RLM_COMPONENT_RECV_COA, recv_coa_type, request);
1768 }
1769
1770 rlm_rcode_t process_send_coa(int send_coa_type, REQUEST *request)
1771 {
1772         return indexed_modcall(RLM_COMPONENT_SEND_COA, send_coa_type, request);
1773 }
1774 #endif