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 #include <freeradius-devel/ident.h>
  26 RCSID("$Id$")
  27
  28 #include <freeradius-devel/radiusd.h>
  29 #include <freeradius-devel/modpriv.h>
  30 #include <freeradius-devel/modcall.h>
  31 #include <freeradius-devel/rad_assert.h>
  32
  33 typedef struct indexed_modcallable {
  34         int comp;
  35         int idx;
  36         modcallable *modulelist;
  37 } indexed_modcallable;
  38
  39 /*
  40  *      For each component, keep an ordered list of ones to call.
  41  */
  42 static lrad_hash_table_t *components;
  43
  44 static rbtree_t *module_tree = NULL;
  45
  46 typedef struct section_type_value_t {
  47         const char      *section;
  48         const char      *typename;
  49         int             attr;
  50 } section_type_value_t;
  51
  52
  53 /*
  54  *      Ordered by component
  55  */
  56 static const section_type_value_t section_type_value[RLM_COMPONENT_COUNT] = {
  57         { "authenticate", "Auth-Type",       PW_AUTH_TYPE },
  58         { "authorize",    "Autz-Type",       PW_AUTZ_TYPE },
  59         { "preacct",      "Pre-Acct-Type",   PW_PRE_ACCT_TYPE },
  60         { "accounting",   "Acct-Type",       PW_ACCT_TYPE },
  61         { "session",      "Session-Type",    PW_SESSION_TYPE },
  62         { "pre-proxy",    "Pre-Proxy-Type",  PW_PRE_PROXY_TYPE },
  63         { "post-proxy",   "Post-Proxy-Type", PW_POST_PROXY_TYPE },
  64         { "post-auth",    "Post-Auth-Type",  PW_POST_AUTH_TYPE },
  65 };
  66
  67 /*
  68  *      Delete ASAP.
  69  */
  70 static const section_type_value_t old_section_type_value[] = {
  71         { "authenticate", "authtype", PW_AUTH_TYPE },
  72         { "authorize",    "autztype", PW_AUTZ_TYPE },
  73         { "preacct",      "Pre-Acct-Type",   PW_PRE_ACCT_TYPE },/* unused */
  74         { "accounting",   "acctype", PW_ACCT_TYPE },
  75         { "session",      "sesstype", PW_SESSION_TYPE },
  76         { "pre-proxy",    "Pre-Proxy-Type",  PW_PRE_PROXY_TYPE }, /* unused */
  77         { "post-proxy",   "Post-Proxy-Type", PW_POST_PROXY_TYPE }, /* unused */
  78         { "post-auth",    "post-authtype", PW_POST_AUTH_TYPE }
  79 };
  80
  81
  82 static void indexed_modcallable_free(void *data)
  83 {
  84         indexed_modcallable *c = data;
  85
  86         modcallable_free(&c->modulelist);
  87         free(c);
  88 }
  89
  90 static uint32_t indexed_modcallable_hash(const void *data)
  91 {
  92         uint32_t hash;
  93         const indexed_modcallable *c = data;
  94
  95         hash = lrad_hash(&c->comp, sizeof(c->comp));
  96         return lrad_hash_update(&c->idx, sizeof(c->idx), hash);
  97 }
  98
  99 static int indexed_modcallable_cmp(const void *one, const void *two)
 100 {
 101         const indexed_modcallable *a = one;
 102         const indexed_modcallable *b = two;
 103
 104         if (a->comp < b->comp) return -1;
 105         if (a->comp >  b->comp) return +1;
 106
 107         return a->idx - b->idx;
 108 }
 109
 110
 111 /*
 112  *      Free a module instance.
 113  */
 114 static void module_instance_free(void *data)
 115 {
 116         module_instance_t *this = data;
 117
 118         if (this->entry->module->detach)
 119                 (this->entry->module->detach)(this->insthandle);
 120 #ifdef HAVE_PTHREAD_H
 121         if (this->mutex) {
 122                 /*
 123                  *      FIXME
 124                  *      The mutex MIGHT be locked...
 125                  *      we'll check for that later, I guess.
 126                  */
 127                 pthread_mutex_destroy(this->mutex);
 128                 free(this->mutex);
 129         }
 130 #endif
 131         free(this);
 132 }
 133
 134
 135 /*
 136  *      Compare two module entries
 137  */
 138 static int module_entry_cmp(const void *one, const void *two)
 139 {
 140         const module_entry_t *a = one;
 141         const module_entry_t *b = two;
 142
 143         return strcmp(a->name, b->name);
 144 }
 145
 146 /*
 147  *      Free a module entry.
 148  */
 149 static void module_entry_free(void *data)
 150 {
 151         module_entry_t *this = data;
 152
 153         lt_dlclose(this->handle);       /* ignore any errors */
 154         free(this);
 155 }
 156
 157
 158 /*
 159  *      Remove the module lists.
 160  */
 161 int detach_modules(void)
 162 {
 163         lrad_hash_table_free(components);
 164         rbtree_free(module_tree);
 165
 166         return 0;
 167 }
 168
 169
 170 /*
 171  *      Find a module on disk or in memory, and link to it.
 172  */
 173 static module_entry_t *linkto_module(const char *module_name,
 174                                      const char *cffilename, int cflineno)
 175 {
 176         module_entry_t myentry;
 177         module_entry_t *node;
 178         lt_dlhandle handle;
 179         char module_struct[256];
 180         char *p;
 181         const void *module;
 182
 183         strlcpy(myentry.name, module_name, sizeof(myentry.name));
 184         node = rbtree_finddata(module_tree, &myentry);
 185         if (node) return node;
 186
 187         /*
 188          *      Keep the handle around so we can dlclose() it.
 189          */
 190         handle = lt_dlopenext(module_name);
 191         if (handle == NULL) {
 192                 radlog(L_ERR|L_CONS, "%s[%d] Failed to link to module '%s':"
 193                        " %s\n", cffilename, cflineno, module_name, lt_dlerror());
 194                 return NULL;
 195         }
 196
 197         /*
 198          *      Link to the module's rlm_FOO{} module structure.
 199          *
 200          *      The module_name variable has the version number
 201          *      embedded in it, and we don't want that here.
 202          */
 203         strcpy(module_struct, module_name);
 204         p = strrchr(module_struct, '-');
 205         if (p) *p = '\0';
 206
 207         DEBUG3("    (Loaded %s, checking if it's valid)", module_name);
 208
 209         /*
 210          *      libltld MAY core here, if the handle it gives us contains
 211          *      garbage data.
 212          */
 213         module = lt_dlsym(handle, module_struct);
 214         if (!module) {
 215                 radlog(L_ERR|L_CONS, "%s[%d] Failed linking to "
 216                                 "%s structure in %s: %s\n",
 217                                 cffilename, cflineno,
 218                                 module_name, cffilename, lt_dlerror());
 219                 lt_dlclose(handle);
 220                 return NULL;
 221         }
 222         /*
 223          *      Before doing anything else, check if it's sane.
 224          */
 225         if ((*(const uint32_t *) module) != RLM_MODULE_MAGIC_NUMBER) {
 226                 lt_dlclose(handle);
 227                 radlog(L_ERR|L_CONS, "%s[%d] Invalid version in module '%s'",
 228                        cffilename, cflineno, module_name);
 229                 return NULL;
 230
 231         }
 232
 233         /* make room for the module type */
 234         node = rad_malloc(sizeof(*node));
 235         memset(node, 0, sizeof(*node));
 236         strlcpy(node->name, module_name, sizeof(node->name));
 237         node->module = module;
 238         node->handle = handle;
 239
 240         DEBUG("Module: Loaded %s ", node->module->name);
 241
 242         /*
 243          *      Add the module as "rlm_foo-version" to the configuration
 244          *      section.
 245          */
 246         if (!rbtree_insert(module_tree, node)) {
 247                 radlog(L_ERR, "Failed to cache module %s", module_name);
 248                 lt_dlclose(handle);
 249                 free(node);
 250                 return NULL;
 251         }
 252
 253         return node;
 254 }
 255
 256 /*
 257  *      Find a module instance.
 258  */
 259 module_instance_t *find_module_instance(CONF_SECTION *modules,
 260                                         const char *instname)
 261 {
 262         CONF_SECTION *cs;
 263         const char *name1, *name2;
 264         module_instance_t *node;
 265         char module_name[256];
 266
 267         if (!modules) return NULL;
 268
 269         /*
 270          *      Module instances are declared in the modules{} block
 271          *      and referenced later by their name, which is the
 272          *      name2 from the config section, or name1 if there was
 273          *      no name2.
 274          */
 275         cs = cf_section_sub_find_name2(modules, NULL, instname);
 276         if (cs == NULL) {
 277                 radlog(L_ERR|L_CONS, "ERROR: Cannot find a configuration entry for module \"%s\".\n", instname);
 278                 return NULL;
 279         }
 280
 281         /*
 282          *      If there's already a module instance, return it.
 283          */
 284         node = cf_data_find(cs, "instance");
 285         if (node) return node;
 286
 287         name1 = cf_section_name1(cs);
 288         name2 = cf_section_name2(cs);
 289
 290         /*
 291          *      Found the configuration entry.
 292          */
 293         node = rad_malloc(sizeof(*node));
 294         memset(node, 0, sizeof(*node));
 295
 296         node->insthandle = NULL;
 297
 298         /*
 299          *      Names in the "modules" section aren't prefixed
 300          *      with "rlm_", so we add it here.
 301          */
 302         snprintf(module_name, sizeof(module_name), "rlm_%s", name1);
 303
 304         node->entry = linkto_module(module_name,
 305                                     mainconfig.radiusd_conf,
 306                                     cf_section_lineno(cs));
 307         if (!node->entry) {
 308                 free(node);
 309                 /* linkto_module logs any errors */
 310                 return NULL;
 311         }
 312
 313         /*
 314          *      Call the module's instantiation routine.
 315          */
 316         if ((node->entry->module->instantiate) &&
 317             ((node->entry->module->instantiate)(cs, &node->insthandle) < 0)) {
 318                 radlog(L_ERR|L_CONS,
 319                                 "%s[%d]: %s: Module instantiation failed.\n",
 320                        mainconfig.radiusd_conf, cf_section_lineno(cs),
 321                        instname);
 322                 free(node);
 323                 return NULL;
 324         }
 325
 326         /*
 327          *      We're done.  Fill in the rest of the data structure,
 328          *      and link it to the module instance list.
 329          */
 330         strlcpy(node->name, instname, sizeof(node->name));
 331
 332 #ifdef HAVE_PTHREAD_H
 333         /*
 334          *      If we're threaded, check if the module is thread-safe.
 335          *
 336          *      If it isn't, we create a mutex.
 337          */
 338         if ((node->entry->module->type & RLM_TYPE_THREAD_UNSAFE) != 0) {
 339                 node->mutex = (pthread_mutex_t *) rad_malloc(sizeof(pthread_mutex_t));
 340                 /*
 341                  *      Initialize the mutex.
 342                  */
 343                 pthread_mutex_init(node->mutex, NULL);
 344         } else {
 345                 /*
 346                  *      The module is thread-safe.  Don't give it a mutex.
 347                  */
 348                 node->mutex = NULL;
 349         }
 350
 351 #endif
 352         cf_data_add(cs, "instance", node, module_instance_free);
 353
 354         DEBUG("Module: Instantiated %s (%s) ", name1, node->name);
 355
 356         return node;
 357 }
 358
 359 static indexed_modcallable *lookup_by_index(int comp, int idx)
 360 {
 361         indexed_modcallable myc;
 362
 363         myc.comp = comp;
 364         myc.idx = idx;
 365
 366         return lrad_hash_table_finddata(components, &myc);
 367 }
 368
 369 /*
 370  *      Create a new sublist.
 371  */
 372 static indexed_modcallable *new_sublist(int comp, int idx)
 373 {
 374         indexed_modcallable *c;
 375
 376         c = lookup_by_index(comp, idx);
 377
 378         /* It is an error to try to create a sublist that already
 379          * exists. It would almost certainly be caused by accidental
 380          * duplication in the config file.
 381          *
 382          * index 0 is the exception, because it is used when we want
 383          * to collect _all_ listed modules under a single index by
 384          * default, which is currently the case in all components
 385          * except authenticate. */
 386         if (c) {
 387                 if (idx == 0) {
 388                         return c;
 389                 }
 390                 return NULL;
 391         }
 392
 393         c = rad_malloc(sizeof(*c));
 394         c->modulelist = NULL;
 395         c->comp = comp;
 396         c->idx = idx;
 397
 398         if (!lrad_hash_table_insert(components, c)) {
 399                 free(c);
 400                 return NULL;
 401         }
 402
 403         return c;
 404 }
 405
 406 static int indexed_modcall(int comp, int idx, REQUEST *request)
 407 {
 408         int rcode;
 409         indexed_modcallable *this;
 410
 411         this = lookup_by_index(comp, idx);
 412         if (!this) {
 413                 if (idx != 0) DEBUG2("  ERROR: Unknown value specified for %s.  Cannot perform requested action.",
 414                                      section_type_value[comp].typename);
 415                 request->component = section_type_value[comp].typename;
 416                 rcode = modcall(comp, NULL, request); /* does default action */
 417         } else {
 418                 DEBUG2("  Processing the %s section of %s",
 419                        section_type_value[comp].section,
 420                        mainconfig.radiusd_conf);
 421                 request->component = section_type_value[comp].typename;
 422                 rcode = modcall(comp, this->modulelist, request);
 423         }
 424         request->module = "<server-core>";
 425         request->component = "<server-core>";
 426         return rcode;
 427 }
 428
 429 /*
 430  *      Load a sub-module list, as found inside an Auth-Type foo {}
 431  *      block
 432  */
 433 static int load_subcomponent_section(modcallable *parent,
 434                                      CONF_SECTION *cs, int comp,
 435                                      const char *filename)
 436 {
 437         indexed_modcallable *subcomp;
 438         modcallable *ml;
 439         DICT_VALUE *dval;
 440         const char *name2 = cf_section_name2(cs);
 441
 442         rad_assert(comp >= RLM_COMPONENT_AUTH);
 443         rad_assert(comp <= RLM_COMPONENT_COUNT);
 444
 445         /*
 446          *      Sanity check.
 447          */
 448         if (!name2) {
 449                 radlog(L_ERR|L_CONS,
 450                        "%s[%d]: No name specified for %s block",
 451                        filename, cf_section_lineno(cs),
 452                        section_type_value[comp].typename);
 453                 return 1;
 454         }
 455
 456         /*
 457          *      Compile the group.
 458          */
 459         ml = compile_modgroup(parent, comp, cs, filename);
 460         if (!ml) {
 461                 return 0;
 462         }
 463
 464         /*
 465          *      We must assign a numeric index to this subcomponent.
 466          *      It is generated and placed in the dictionary by
 467          *      setup_modules(), when it loads the sections.  If it
 468          *      isn't found, it's a serious error.
 469          */
 470         dval = dict_valbyname(section_type_value[comp].attr, name2);
 471         if (!dval) {
 472                 radlog(L_ERR|L_CONS,
 473                        "%s[%d] %s %s Not previously configured",
 474                        filename, cf_section_lineno(cs),
 475                        section_type_value[comp].typename, name2);
 476                 modcallable_free(&ml);
 477                 return 0;
 478         }
 479
 480         subcomp = new_sublist(comp, dval->value);
 481         if (!subcomp) {
 482                 radlog(L_ERR|L_CONS,
 483                        "%s[%d] %s %s already configured - skipping",
 484                        filename, cf_section_lineno(cs),
 485                        section_type_value[comp].typename, name2);
 486                 modcallable_free(&ml);
 487                 return 1;
 488         }
 489
 490         subcomp->modulelist = ml;
 491         return 1;               /* OK */
 492 }
 493
 494 static int load_component_section(modcallable *parent,
 495                                   CONF_SECTION *cs, int comp,
 496                                   const char *filename)
 497 {
 498         modcallable *this;
 499         CONF_ITEM *modref;
 500         int idx;
 501         indexed_modcallable *subcomp;
 502         const char *modname;
 503         const char *visiblename;
 504
 505         /*
 506          *      Loop over the entries in the named section.
 507          */
 508         for (modref = cf_item_find_next(cs, NULL);
 509              modref != NULL;
 510              modref = cf_item_find_next(cs, modref)) {
 511                 CONF_PAIR *cp = NULL;
 512                 CONF_SECTION *scs = NULL;
 513
 514                 /*
 515                  *      Look for Auth-Type foo {}, which are special
 516                  *      cases of named sections, and allowable ONLY
 517                  *      at the top-level.
 518                  *
 519                  *      i.e. They're not allowed in a "group" or "redundant"
 520                  *      subsection.
 521                  */
 522                 if (cf_item_is_section(modref)) {
 523                         const char *sec_name;
 524                         scs = cf_itemtosection(modref);
 525
 526                         sec_name = cf_section_name1(scs);
 527
 528                         if (strcmp(sec_name,
 529                                    section_type_value[comp].typename) == 0) {
 530                                 if (!load_subcomponent_section(parent, scs,
 531                                                                comp,
 532                                                                filename)) {
 533                                         return -1; /* FIXME: memleak? */
 534                                 }
 535                                 continue;
 536                         }
 537
 538                         /*
 539                          *      Allow old names, too.
 540                          */
 541                         if (strcmp(sec_name,
 542                                    old_section_type_value[comp].typename) == 0) {
 543                                 if (!load_subcomponent_section(parent, scs,
 544                                                                comp,
 545                                                                filename)) {
 546                                         return -1; /* FIXME: memleak? */
 547                                 }
 548                                 continue;
 549                         }
 550                         cp = NULL;
 551                 } else if (cf_item_is_pair(modref)) {
 552                         cp = cf_itemtopair(modref);
 553                 } else {
 554                         continue; /* ignore it */
 555                 }
 556
 557                 /*
 558                  *      Try to compile one entry.
 559                  */
 560                 this = compile_modsingle(parent, comp, modref, filename,
 561                                          &modname);
 562                 if (!this) {
 563                         radlog(L_ERR|L_CONS,
 564                                "%s[%d] Failed to parse %s section.\n",
 565                                filename, cf_section_lineno(cs),
 566                                cf_section_name1(cs));
 567                         return -1;
 568                 }
 569
 570                 if (comp == RLM_COMPONENT_AUTH) {
 571                         DICT_VALUE *dval;
 572                         const char *modrefname = NULL;
 573                         int lineno = 0;
 574
 575                         if (cp) {
 576                                 modrefname = cf_pair_attr(cp);
 577                                 lineno = cf_pair_lineno(cp);
 578                         } else {
 579                                 modrefname = cf_section_name2(scs);
 580                                 lineno = cf_section_lineno(scs);
 581                                 if (!modrefname) {
 582                                         radlog(L_ERR|L_CONS,
 583                                                "%s[%d] Failed to parse %s sub-section.\n",
 584                                                filename, lineno,
 585                                                cf_section_name1(scs));
 586                                         return -1;
 587                                 }
 588                         }
 589
 590                         dval = dict_valbyname(PW_AUTH_TYPE, modrefname);
 591                         if (!dval) {
 592                                 /*
 593                                  *      It's a section, but nothing we
 594                                  *      recognize.  Die!
 595                                  */
 596                                 radlog(L_ERR|L_CONS, "%s[%d] Unknown Auth-Type \"%s\" in %s sub-section.",
 597                                        filename, lineno,
 598                                        modrefname, section_type_value[comp].section);
 599                                 return -1;
 600                         }
 601                         idx = dval->value;
 602                 } else {
 603                         /* See the comment in new_sublist() for explanation
 604                          * of the special index 0 */
 605                         idx = 0;
 606                 }
 607
 608                 subcomp = new_sublist(comp, idx);
 609                 if (subcomp == NULL) {
 610                         radlog(L_INFO|L_CONS,
 611                                         "%s %s %s already configured - skipping",
 612                                         filename, section_type_value[comp].typename,
 613                                         modname);
 614                         modcallable_free(&this);
 615                         continue;
 616                 }
 617
 618                 /* If subcomp->modulelist is NULL, add_to_modcallable will
 619                  * create it */
 620                 visiblename = cf_section_name2(cs);
 621                 if (visiblename == NULL)
 622                         visiblename = cf_section_name1(cs);
 623                 add_to_modcallable(&subcomp->modulelist, this,
 624                                    comp, visiblename);
 625         }
 626
 627         return 0;
 628 }
 629
 630
 631 /*
 632  *      Parse the module config sections, and load
 633  *      and call each module's init() function.
 634  *
 635  *      Libtool makes your life a LOT easier, especially with libltdl.
 636  *      see: http://www.gnu.org/software/libtool/
 637  */
 638 int setup_modules(int reload)
 639 {
 640         int             comp;
 641         CONF_SECTION    *cs, *modules;
 642         int             do_component[RLM_COMPONENT_COUNT];
 643         rad_listen_t    *listener;
 644
 645         /*
 646          *      If necessary, initialize libltdl.
 647          */
 648         if (!reload) {
 649                 /*
 650                  *      Set the default list of preloaded symbols.
 651                  *      This is used to initialize libltdl's list of
 652                  *      preloaded modules.
 653                  *
 654                  *      i.e. Static modules.
 655                  */
 656                 LTDL_SET_PRELOADED_SYMBOLS();
 657
 658                 if (lt_dlinit() != 0) {
 659                         radlog(L_ERR|L_CONS, "Failed to initialize libraries: %s\n",
 660                                         lt_dlerror());
 661                         return -1;
 662                 }
 663
 664                 /*
 665                  *      Set the search path to ONLY our library directory.
 666                  *      This prevents the modules from being found from
 667                  *      any location on the disk.
 668                  */
 669                 lt_dlsetsearchpath(radlib_dir);
 670
 671                 DEBUG2("Module: Library search path is %s",
 672                                 lt_dlgetsearchpath());
 673
 674                 /*
 675                  *      Set up the internal module struct.
 676                  */
 677                 module_tree = rbtree_create(module_entry_cmp,
 678                                             module_entry_free, 0);
 679                 if (!module_tree) {
 680                         radlog(L_ERR|L_CONS, "Failed to initialize modules\n");
 681                         return -1;
 682                 }
 683         } else {
 684                 lrad_hash_table_free(components);
 685         }
 686
 687         components = lrad_hash_table_create(indexed_modcallable_hash,
 688                                             indexed_modcallable_cmp,
 689                                             indexed_modcallable_free);
 690         if (!components) {
 691                 radlog(L_ERR|L_CONS, "Failed to initialize components\n");
 692                 return -1;
 693         }
 694
 695         /*
 696          *      Figure out which sections to load.
 697          */
 698         memset(do_component, 0, sizeof(do_component));
 699         for (listener = mainconfig.listen;
 700              listener != NULL;
 701              listener = listener->next) {
 702                 switch (listener->type) {
 703                 case RAD_LISTEN_AUTH:
 704                         do_component[RLM_COMPONENT_AUTZ] = 1;
 705                         do_component[RLM_COMPONENT_AUTH] = 1;
 706                         do_component[RLM_COMPONENT_POST_AUTH] = 1;
 707                         do_component[RLM_COMPONENT_SESS] = 1;
 708                         break;
 709
 710                 case RAD_LISTEN_DETAIL: /* just like acct */
 711                 case RAD_LISTEN_ACCT:
 712                         do_component[RLM_COMPONENT_PREACCT] = 1;
 713                         do_component[RLM_COMPONENT_ACCT] = 1;
 714                         break;
 715
 716                 case RAD_LISTEN_PROXY:
 717                         do_component[RLM_COMPONENT_PRE_PROXY] = 1;
 718                         do_component[RLM_COMPONENT_POST_PROXY] = 1;
 719                         break;
 720
 721
 722                 default:
 723                         rad_assert(0 == 1);
 724                         break;
 725                 }
 726         }
 727
 728         for (comp = RLM_COMPONENT_AUTH; comp < RLM_COMPONENT_COUNT; comp++) {
 729                 /*
 730                  *      Have the debugging messages all in one place.
 731                  */
 732                 if (!do_component[comp]) {
 733                         DEBUG2("modules: Not loading %s{} section",
 734                                section_type_value[comp].section);
 735                 }
 736         }
 737
 738         /*
 739          *      Create any DICT_VALUE's for the types.  See
 740          *      'doc/configurable_failover' for examples of 'authtype'
 741          *      used to create new Auth-Type values.  In order to
 742          *      let the user create new names, we've got to look for
 743          *      those names, and create DICT_VALUE's for them.
 744          */
 745         for (comp = RLM_COMPONENT_AUTH; comp < RLM_COMPONENT_COUNT; comp++) {
 746                 int             value;
 747                 const char      *name2;
 748                 DICT_ATTR       *dattr;
 749                 DICT_VALUE      *dval;
 750                 CONF_SECTION    *sub, *next;
 751                 CONF_PAIR       *cp;
 752
 753                 /*
 754                  *      Not needed, don't load it.
 755                  */
 756                 if (!do_component[comp]) {
 757                         continue;
 758                 }
 759                 cs = cf_section_find(section_type_value[comp].section);
 760
 761                 if (!cs) continue;
 762
 763                 sub = NULL;
 764                 do {
 765                         /*
 766                          *      See if there's a sub-section by that
 767                          *      name.
 768                          */
 769                         next = cf_subsection_find_next(cs, sub,
 770                                                        section_type_value[comp].typename);
 771
 772                         /*
 773                          *      Allow some old names, too.
 774                          */
 775                         if (!next && (comp <= 4)) {
 776                                 next = cf_subsection_find_next(cs, sub,
 777                                                                old_section_type_value[comp].typename);
 778                         }
 779                         sub = next;
 780
 781                         /*
 782                          *      If so, look for it to define a new
 783                          *      value.
 784                          */
 785                         name2 = cf_section_name2(sub);
 786                         if (!name2) continue;
 787
 788
 789                         /*
 790                          *      If the value already exists, don't
 791                          *      create it again.
 792                          */
 793                         dval = dict_valbyname(section_type_value[comp].attr,
 794                                               name2);
 795                         if (dval) continue;
 796
 797                         /*
 798                          *      Find the attribute for the value.
 799                          */
 800                         dattr = dict_attrbyvalue(section_type_value[comp].attr);
 801                         if (!dattr) {
 802                                 radlog(L_ERR, "%s[%d]: No such attribute %s",
 803                                        mainconfig.radiusd_conf,
 804                                        cf_section_lineno(sub),
 805                                        section_type_value[comp].typename);
 806                                 continue;
 807                         }
 808
 809                         /*
 810                          *      Create a new unique value with a
 811                          *      meaningless number.  You can't look at
 812                          *      it from outside of this code, so it
 813                          *      doesn't matter.  The only requirement
 814                          *      is that it's unique.
 815                          */
 816                         do {
 817                                 value = lrad_rand() & 0x00ffffff;
 818                         } while (dict_valbyattr(dattr->attr, value));
 819
 820                         if (dict_addvalue(name2, dattr->name, value) < 0) {
 821                                 radlog(L_ERR, "%s", librad_errstr);
 822                                 return -1;
 823                         }
 824                 } while (sub != NULL);
 825
 826                 /*
 827                  *      Loop over the non-sub-sections, too.
 828                  */
 829                 cp = NULL;
 830                 do {
 831                         /*
 832                          *      See if there's a conf-pair by that
 833                          *      name.
 834                          */
 835                         cp = cf_pair_find_next(cs, cp, NULL);
 836                         if (!cp) break;
 837
 838
 839                         /*
 840                          *      If the value already exists, don't
 841                          *      create it again.
 842                          */
 843                         name2 = cf_pair_attr(cp);
 844                         dval = dict_valbyname(section_type_value[comp].attr,
 845                                               name2);
 846                         if (dval) continue;
 847
 848                         /*
 849                          *      Find the attribute for the value.
 850                          */
 851                         dattr = dict_attrbyvalue(section_type_value[comp].attr);
 852                         if (!dattr) {
 853                                 radlog(L_ERR, "%s[%d]: No such attribute %s",
 854                                        mainconfig.radiusd_conf,
 855                                        cf_section_lineno(sub),
 856                                        section_type_value[comp].typename);
 857                                 continue;
 858                         }
 859
 860                         /*
 861                          *      Finally, create the new attribute.
 862                          */
 863                         do {
 864                                 value = lrad_rand() & 0x00ffffff;
 865                         } while (dict_valbyattr(dattr->attr, value));
 866                         if (dict_addvalue(name2, dattr->name, value) < 0) {
 867                                 radlog(L_ERR, "%s", librad_errstr);
 868                                 return -1;
 869                         }
 870                 } while (cp != NULL);
 871         } /* over the sections which can have redundent sub-sections */
 872
 873         /*
 874          *      Remember where the modules were stored.
 875          */
 876         modules = cf_section_find("modules");
 877         if (!modules) {
 878                 radlog(L_ERR, "Cannot find a \"modules\" section in the configuration file!");
 879                 return -1;
 880         }
 881
 882         /*
 883          *  Look for the 'instantiate' section, which tells us
 884          *  the instantiation order of the modules, and also allows
 885          *  us to load modules with no authorize/authenticate/etc.
 886          *  sections.
 887          */
 888         cs = cf_section_find("instantiate");
 889         if (cs != NULL) {
 890                 CONF_ITEM *ci;
 891                 CONF_PAIR *cp;
 892                 module_instance_t *module;
 893                 const char *name;
 894
 895                 /*
 896                  *  Loop over the items in the 'instantiate' section.
 897                  */
 898                 for (ci=cf_item_find_next(cs, NULL);
 899                      ci != NULL;
 900                      ci=cf_item_find_next(cs, ci)) {
 901
 902                         /*
 903                          *      Skip sections.  They'll be handled
 904                          *      later, if they're referenced at all...
 905                          */
 906                         if (cf_item_is_section(ci)) {
 907                                 continue;
 908                         }
 909
 910                         cp = cf_itemtopair(ci);
 911                         name = cf_pair_attr(cp);
 912                         module = find_module_instance(modules, name);
 913                         if (!module) {
 914                                 return -1;
 915                         }
 916                 } /* loop over items in the subsection */
 917         } /* if there's an 'instantiate' section. */
 918
 919         /*
 920          *      Loop over all of the known components, finding their
 921          *      configuration section, and loading it.
 922          */
 923         for (comp = 0; comp < RLM_COMPONENT_COUNT; ++comp) {
 924                 cs = cf_section_find(section_type_value[comp].section);
 925                 if (cs == NULL)
 926                         continue;
 927
 928                 if (!do_component[comp]) {
 929                         continue;
 930                 }
 931
 932                 if (load_component_section(NULL, cs, comp, mainconfig.radiusd_conf) < 0) {
 933                         return -1;
 934                 }
 935         }
 936
 937         return 0;
 938 }
 939
 940 /*
 941  *      Call all authorization modules until one returns
 942  *      somethings else than RLM_MODULE_OK
 943  */
 944 int module_authorize(int autz_type, REQUEST *request)
 945 {
 946         return indexed_modcall(RLM_COMPONENT_AUTZ, autz_type, request);
 947 }
 948
 949 /*
 950  *      Authenticate a user/password with various methods.
 951  */
 952 int module_authenticate(int auth_type, REQUEST *request)
 953 {
 954         return indexed_modcall(RLM_COMPONENT_AUTH, auth_type, request);
 955 }
 956
 957 /*
 958  *      Do pre-accounting for ALL configured sessions
 959  */
 960 int module_preacct(REQUEST *request)
 961 {
 962         return indexed_modcall(RLM_COMPONENT_PREACCT, 0, request);
 963 }
 964
 965 /*
 966  *      Do accounting for ALL configured sessions
 967  */
 968 int module_accounting(int acct_type, REQUEST *request)
 969 {
 970         return indexed_modcall(RLM_COMPONENT_ACCT, acct_type, request);
 971 }
 972
 973 /*
 974  *      See if a user is already logged in.
 975  *
 976  *      Returns: 0 == OK, 1 == double logins, 2 == multilink attempt
 977  */
 978 int module_checksimul(int sess_type, REQUEST *request, int maxsimul)
 979 {
 980         int rcode;
 981
 982         if(!request->username)
 983                 return 0;
 984
 985         request->simul_count = 0;
 986         request->simul_max = maxsimul;
 987         request->simul_mpp = 1;
 988
 989         rcode = indexed_modcall(RLM_COMPONENT_SESS, sess_type, request);
 990
 991         if (rcode != RLM_MODULE_OK) {
 992                 /* FIXME: Good spot for a *rate-limited* warning to the log */
 993                 return 0;
 994         }
 995
 996         return (request->simul_count < maxsimul) ? 0 : request->simul_mpp;
 997 }
 998
 999 /*
1000  *      Do pre-proxying for ALL configured sessions
1001  */
1002 int module_pre_proxy(int type, REQUEST *request)
1003 {
1004         return indexed_modcall(RLM_COMPONENT_PRE_PROXY, type, request);
1005 }
1006
1007 /*
1008  *      Do post-proxying for ALL configured sessions
1009  */
1010 int module_post_proxy(int type, REQUEST *request)
1011 {
1012         return indexed_modcall(RLM_COMPONENT_POST_PROXY, type, request);
1013 }
1014
1015 /*
1016  *      Do post-authentication for ALL configured sessions
1017  */
1018 int module_post_auth(int postauth_type, REQUEST *request)
1019 {
1020         return indexed_modcall(RLM_COMPONENT_POST_AUTH, postauth_type, request);
1021 }
1022