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 #define VMPS_SPACE "vmps"
  34
  35 typedef struct indexed_modcallable {
  36         const           char *space;
  37         int             comp;
  38         int             idx;
  39         modcallable     *modulelist;
  40 } indexed_modcallable;
  41
  42 /*
  43  *      For each component, keep an ordered list of ones to call.
  44  */
  45 static rbtree_t *components;
  46
  47 static rbtree_t *module_tree = NULL;
  48
  49 typedef struct section_type_value_t {
  50         const char      *section;
  51         const char      *typename;
  52         int             attr;
  53 } section_type_value_t;
  54
  55
  56 /*
  57  *      Ordered by component
  58  */
  59 static const section_type_value_t section_type_value[RLM_COMPONENT_COUNT] = {
  60         { "authenticate", "Auth-Type",       PW_AUTH_TYPE },
  61         { "authorize",    "Autz-Type",       PW_AUTZ_TYPE },
  62         { "preacct",      "Pre-Acct-Type",   PW_PRE_ACCT_TYPE },
  63         { "accounting",   "Acct-Type",       PW_ACCT_TYPE },
  64         { "session",      "Session-Type",    PW_SESSION_TYPE },
  65         { "pre-proxy",    "Pre-Proxy-Type",  PW_PRE_PROXY_TYPE },
  66         { "post-proxy",   "Post-Proxy-Type", PW_POST_PROXY_TYPE },
  67         { "post-auth",    "Post-Auth-Type",  PW_POST_AUTH_TYPE },
  68 };
  69
  70 static void indexed_modcallable_free(void *data)
  71 {
  72         indexed_modcallable *c = data;
  73
  74         modcallable_free(&c->modulelist);
  75         free(c);
  76 }
  77
  78 static int indexed_modcallable_cmp(const void *one, const void *two)
  79 {
  80         int rcode;
  81         const indexed_modcallable *a = one;
  82         const indexed_modcallable *b = two;
  83
  84         if (a->space && !b->space) return -1;
  85         if (!a->space && b->space) return +1;
  86         if (a->space && b->space) {
  87                 rcode = strcmp(a->space, b->space);
  88                 if (rcode != 0) return rcode;
  89         }
  90
  91         if (a->comp < b->comp) return -1;
  92         if (a->comp >  b->comp) return +1;
  93
  94         return a->idx - b->idx;
  95 }
  96
  97
  98 /*
  99  *      Free a module instance.
 100  */
 101 static void module_instance_free(void *data)
 102 {
 103         module_instance_t *this = data;
 104
 105         if (this->entry->module->detach)
 106                 (this->entry->module->detach)(this->insthandle);
 107 #ifdef HAVE_PTHREAD_H
 108         if (this->mutex) {
 109                 /*
 110                  *      FIXME
 111                  *      The mutex MIGHT be locked...
 112                  *      we'll check for that later, I guess.
 113                  */
 114                 pthread_mutex_destroy(this->mutex);
 115                 free(this->mutex);
 116         }
 117 #endif
 118         free(this);
 119 }
 120
 121
 122 /*
 123  *      Compare two module entries
 124  */
 125 static int module_entry_cmp(const void *one, const void *two)
 126 {
 127         const module_entry_t *a = one;
 128         const module_entry_t *b = two;
 129
 130         return strcmp(a->name, b->name);
 131 }
 132
 133 /*
 134  *      Free a module entry.
 135  */
 136 static void module_entry_free(void *data)
 137 {
 138         module_entry_t *this = data;
 139
 140         lt_dlclose(this->handle);       /* ignore any errors */
 141         free(this);
 142 }
 143
 144
 145 /*
 146  *      Remove the module lists.
 147  */
 148 int detach_modules(void)
 149 {
 150         rbtree_free(components);
 151         rbtree_free(module_tree);
 152
 153         return 0;
 154 }
 155
 156
 157 /*
 158  *      Find a module on disk or in memory, and link to it.
 159  */
 160 static module_entry_t *linkto_module(const char *module_name,
 161                                      const char *cffilename, int cflineno)
 162 {
 163         module_entry_t myentry;
 164         module_entry_t *node;
 165         lt_dlhandle handle;
 166         char module_struct[256];
 167         char *p;
 168         const void *module;
 169
 170         strlcpy(myentry.name, module_name, sizeof(myentry.name));
 171         node = rbtree_finddata(module_tree, &myentry);
 172         if (node) return node;
 173
 174         /*
 175          *      Keep the handle around so we can dlclose() it.
 176          */
 177         handle = lt_dlopenext(module_name);
 178         if (handle == NULL) {
 179                 radlog(L_ERR|L_CONS, "%s[%d]: Failed to link to module '%s':"
 180                        " %s\n", cffilename, cflineno, module_name, lt_dlerror());
 181                 return NULL;
 182         }
 183
 184         /*
 185          *      Link to the module's rlm_FOO{} module structure.
 186          *
 187          *      The module_name variable has the version number
 188          *      embedded in it, and we don't want that here.
 189          */
 190         strcpy(module_struct, module_name);
 191         p = strrchr(module_struct, '-');
 192         if (p) *p = '\0';
 193
 194         DEBUG3("    (Loaded %s, checking if it's valid)", module_name);
 195
 196         /*
 197          *      libltld MAY core here, if the handle it gives us contains
 198          *      garbage data.
 199          */
 200         module = lt_dlsym(handle, module_struct);
 201         if (!module) {
 202                 radlog(L_ERR|L_CONS, "%s[%d]: Failed linking to "
 203                                 "%s structure in %s: %s\n",
 204                                 cffilename, cflineno,
 205                                 module_name, cffilename, lt_dlerror());
 206                 lt_dlclose(handle);
 207                 return NULL;
 208         }
 209         /*
 210          *      Before doing anything else, check if it's sane.
 211          */
 212         if ((*(const uint32_t *) module) != RLM_MODULE_MAGIC_NUMBER) {
 213                 lt_dlclose(handle);
 214                 radlog(L_ERR|L_CONS, "%s[%d]: Invalid version in module '%s'",
 215                        cffilename, cflineno, module_name);
 216                 return NULL;
 217
 218         }
 219
 220         /* make room for the module type */
 221         node = rad_malloc(sizeof(*node));
 222         memset(node, 0, sizeof(*node));
 223         strlcpy(node->name, module_name, sizeof(node->name));
 224         node->module = module;
 225         node->handle = handle;
 226
 227         DEBUG(" Module: Linked to module %s", module_name);
 228
 229         /*
 230          *      Add the module as "rlm_foo-version" to the configuration
 231          *      section.
 232          */
 233         if (!rbtree_insert(module_tree, node)) {
 234                 radlog(L_ERR, "Failed to cache module %s", module_name);
 235                 lt_dlclose(handle);
 236                 free(node);
 237                 return NULL;
 238         }
 239
 240         return node;
 241 }
 242
 243 /*
 244  *      Find a module instance.
 245  */
 246 module_instance_t *find_module_instance(CONF_SECTION *modules,
 247                                         const char *instname)
 248 {
 249         CONF_SECTION *cs;
 250         const char *name1, *name2;
 251         module_instance_t *node;
 252         char module_name[256];
 253
 254         if (!modules) return NULL;
 255
 256         /*
 257          *      Module instances are declared in the modules{} block
 258          *      and referenced later by their name, which is the
 259          *      name2 from the config section, or name1 if there was
 260          *      no name2.
 261          */
 262         cs = cf_section_sub_find_name2(modules, NULL, instname);
 263         if (cs == NULL) {
 264                 radlog(L_ERR|L_CONS, "ERROR: Cannot find a configuration entry for module \"%s\".\n", instname);
 265                 return NULL;
 266         }
 267
 268         /*
 269          *      If there's already a module instance, return it.
 270          */
 271         node = cf_data_find(cs, "instance");
 272         if (node) return node;
 273
 274         name1 = cf_section_name1(cs);
 275         name2 = cf_section_name2(cs);
 276
 277         /*
 278          *      Found the configuration entry.
 279          */
 280         node = rad_malloc(sizeof(*node));
 281         memset(node, 0, sizeof(*node));
 282
 283         node->insthandle = NULL;
 284
 285         /*
 286          *      Names in the "modules" section aren't prefixed
 287          *      with "rlm_", so we add it here.
 288          */
 289         snprintf(module_name, sizeof(module_name), "rlm_%s", name1);
 290
 291         node->entry = linkto_module(module_name,
 292                                     mainconfig.radiusd_conf,
 293                                     cf_section_lineno(cs));
 294         if (!node->entry) {
 295                 free(node);
 296                 /* linkto_module logs any errors */
 297                 return NULL;
 298         }
 299
 300         DEBUG2(" Module: Instantiating %s", instname);
 301
 302         /*
 303          *      Call the module's instantiation routine.
 304          */
 305         if ((node->entry->module->instantiate) &&
 306             ((node->entry->module->instantiate)(cs, &node->insthandle) < 0)) {
 307                 radlog(L_ERR|L_CONS,
 308                                 "%s[%d]: %s: Module instantiation failed.\n",
 309                        mainconfig.radiusd_conf, cf_section_lineno(cs),
 310                        instname);
 311                 free(node);
 312                 return NULL;
 313         }
 314
 315         /*
 316          *      We're done.  Fill in the rest of the data structure,
 317          *      and link it to the module instance list.
 318          */
 319         strlcpy(node->name, instname, sizeof(node->name));
 320
 321 #ifdef HAVE_PTHREAD_H
 322         /*
 323          *      If we're threaded, check if the module is thread-safe.
 324          *
 325          *      If it isn't, we create a mutex.
 326          */
 327         if ((node->entry->module->type & RLM_TYPE_THREAD_UNSAFE) != 0) {
 328                 node->mutex = (pthread_mutex_t *) rad_malloc(sizeof(pthread_mutex_t));
 329                 /*
 330                  *      Initialize the mutex.
 331                  */
 332                 pthread_mutex_init(node->mutex, NULL);
 333         } else {
 334                 /*
 335                  *      The module is thread-safe.  Don't give it a mutex.
 336                  */
 337                 node->mutex = NULL;
 338         }
 339
 340 #endif
 341         cf_data_add(cs, "instance", node, module_instance_free);
 342
 343         return node;
 344 }
 345
 346 static indexed_modcallable *lookup_by_index(const char *space, int comp,
 347                                             int idx)
 348 {
 349         indexed_modcallable myc;
 350
 351         myc.comp = comp;
 352         myc.idx = idx;
 353         myc.space = space;
 354
 355         return rbtree_finddata(components, &myc);
 356 }
 357
 358 /*
 359  *      Create a new sublist.
 360  */
 361 static indexed_modcallable *new_sublist(const char *space, int comp, int idx)
 362 {
 363         indexed_modcallable *c;
 364
 365         c = lookup_by_index(space, comp, idx);
 366
 367         /* It is an error to try to create a sublist that already
 368          * exists. It would almost certainly be caused by accidental
 369          * duplication in the config file.
 370          *
 371          * index 0 is the exception, because it is used when we want
 372          * to collect _all_ listed modules under a single index by
 373          * default, which is currently the case in all components
 374          * except authenticate. */
 375         if (c) {
 376                 if (idx == 0) {
 377                         return c;
 378                 }
 379                 return NULL;
 380         }
 381
 382         c = rad_malloc(sizeof(*c));
 383         c->modulelist = NULL;
 384         c->space = space;
 385         c->comp = comp;
 386         c->idx = idx;
 387
 388         if (!rbtree_insert(components, c)) {
 389                 free(c);
 390                 return NULL;
 391         }
 392
 393         return c;
 394 }
 395
 396 static int indexed_modcall(const char *space, int comp, int idx,
 397                            REQUEST *request)
 398 {
 399         int rcode;
 400         indexed_modcallable *this;
 401         modcallable *list = NULL;
 402
 403         this = lookup_by_index(space, comp, idx);
 404         if (!this) {
 405                 if (idx != 0) DEBUG2("  WARNING: Unknown value specified for %s.  Cannot perform requested action.",
 406                                      section_type_value[comp].typename);
 407         } else {
 408                 list = this->modulelist;
 409         }
 410
 411         request->component = section_type_value[comp].section;
 412
 413         rcode = modcall(comp, list, request);
 414
 415         request->module = "<server-core>";
 416         request->component = "<server-core>";
 417         return rcode;
 418 }
 419
 420 /*
 421  *      Load a sub-module list, as found inside an Auth-Type foo {}
 422  *      block
 423  */
 424 static int load_subcomponent_section(modcallable *parent, CONF_SECTION *cs,
 425                                      const char *space, int comp)
 426 {
 427         indexed_modcallable *subcomp;
 428         modcallable *ml;
 429         DICT_VALUE *dval;
 430         const char *name2 = cf_section_name2(cs);
 431
 432         rad_assert(comp >= RLM_COMPONENT_AUTH);
 433         rad_assert(comp <= RLM_COMPONENT_COUNT);
 434
 435         /*
 436          *      Sanity check.
 437          */
 438         if (!name2) {
 439                 radlog(L_ERR|L_CONS,
 440                        "%s[%d]: No name specified for %s block",
 441                        cf_section_filename(cs), cf_section_lineno(cs),
 442                        section_type_value[comp].typename);
 443                 return 1;
 444         }
 445
 446         /*
 447          *      Compile the group.
 448          */
 449         ml = compile_modgroup(parent, comp, cs);
 450         if (!ml) {
 451                 return 0;
 452         }
 453
 454         /*
 455          *      We must assign a numeric index to this subcomponent.
 456          *      It is generated and placed in the dictionary by
 457          *      setup_modules(), when it loads the sections.  If it
 458          *      isn't found, it's a serious error.
 459          */
 460         dval = dict_valbyname(section_type_value[comp].attr, name2);
 461         if (!dval) {
 462                 radlog(L_ERR|L_CONS,
 463                        "%s[%d]: %s %s Not previously configured",
 464                        cf_section_filename(cs), cf_section_lineno(cs),
 465                        section_type_value[comp].typename, name2);
 466                 modcallable_free(&ml);
 467                 return 0;
 468         }
 469
 470         subcomp = new_sublist(space, comp, dval->value);
 471         if (!subcomp) {
 472                 modcallable_free(&ml);
 473                 return 1;
 474         }
 475
 476         subcomp->modulelist = ml;
 477         return 1;               /* OK */
 478 }
 479
 480 static int load_component_section(modcallable *parent, CONF_SECTION *cs,
 481                                   const char *space, int comp)
 482 {
 483         modcallable *this;
 484         CONF_ITEM *modref;
 485         int idx;
 486         indexed_modcallable *subcomp;
 487         const char *modname;
 488         const char *visiblename;
 489
 490         /*
 491          *      Loop over the entries in the named section.
 492          */
 493         for (modref = cf_item_find_next(cs, NULL);
 494              modref != NULL;
 495              modref = cf_item_find_next(cs, modref)) {
 496                 CONF_PAIR *cp = NULL;
 497                 CONF_SECTION *scs = NULL;
 498
 499                 /*
 500                  *      Look for Auth-Type foo {}, which are special
 501                  *      cases of named sections, and allowable ONLY
 502                  *      at the top-level.
 503                  *
 504                  *      i.e. They're not allowed in a "group" or "redundant"
 505                  *      subsection.
 506                  */
 507                 if (cf_item_is_section(modref)) {
 508                         const char *sec_name;
 509                         scs = cf_itemtosection(modref);
 510
 511                         sec_name = cf_section_name1(scs);
 512
 513                         if (strcmp(sec_name,
 514                                    section_type_value[comp].typename) == 0) {
 515                                 if (!load_subcomponent_section(parent, scs,
 516                                                                space, comp)) {
 517                                         return -1; /* FIXME: memleak? */
 518                                 }
 519                                 continue;
 520                         }
 521
 522                         cp = NULL;
 523                 } else if (cf_item_is_pair(modref)) {
 524                         cp = cf_itemtopair(modref);
 525                 } else {
 526                         continue; /* ignore it */
 527                 }
 528
 529                 /*
 530                  *      Try to compile one entry.
 531                  */
 532                 this = compile_modsingle(parent, comp, modref, &modname);
 533                 if (!this) {
 534                         radlog(L_ERR|L_CONS,
 535                                "%s[%d]: Failed to parse %s section.\n",
 536                                cf_section_filename(cs), cf_section_lineno(cs),
 537                                cf_section_name1(cs));
 538                         return -1;
 539                 }
 540
 541                 if (comp == RLM_COMPONENT_AUTH) {
 542                         DICT_VALUE *dval;
 543                         const char *modrefname = NULL;
 544                         if (cp) {
 545                                 modrefname = cf_pair_attr(cp);
 546                         } else {
 547                                 modrefname = cf_section_name2(scs);
 548                                 if (!modrefname) {
 549                                         radlog(L_ERR|L_CONS,
 550                                                "%s[%d]: Failed to parse %s sub-section.\n",
 551                                                cf_section_filename(cs),
 552                                                cf_section_lineno(cs),
 553                                                cf_section_name1(scs));
 554                                         return -1;
 555                                 }
 556                         }
 557
 558                         dval = dict_valbyname(PW_AUTH_TYPE, modrefname);
 559                         if (!dval) {
 560                                 /*
 561                                  *      It's a section, but nothing we
 562                                  *      recognize.  Die!
 563                                  */
 564                                 radlog(L_ERR|L_CONS, "%s[%d]: Unknown Auth-Type \"%s\" in %s sub-section.",
 565                                        cf_section_filename(cs), cf_section_lineno(cs),
 566                                        modrefname, section_type_value[comp].section);
 567                                 return -1;
 568                         }
 569                         idx = dval->value;
 570                 } else {
 571                         /* See the comment in new_sublist() for explanation
 572                          * of the special index 0 */
 573                         idx = 0;
 574                 }
 575
 576                 subcomp = new_sublist(space, comp, idx);
 577                 if (subcomp == NULL) {
 578                         modcallable_free(&this);
 579                         continue;
 580                 }
 581
 582                 /* If subcomp->modulelist is NULL, add_to_modcallable will
 583                  * create it */
 584                 visiblename = cf_section_name2(cs);
 585                 if (visiblename == NULL)
 586                         visiblename = cf_section_name1(cs);
 587                 add_to_modcallable(&subcomp->modulelist, this,
 588                                    comp, visiblename);
 589         }
 590
 591         return 0;
 592 }
 593
 594 static int load_byspace(CONF_SECTION *cs, const char *space,
 595                         int *do_component)
 596 {
 597         int comp;
 598
 599         /*
 600          *      Create any DICT_VALUE's for the types.  See
 601          *      'doc/configurable_failover' for examples of 'authtype'
 602          *      used to create new Auth-Type values.  In order to
 603          *      let the user create new names, we've got to look for
 604          *      those names, and create DICT_VALUE's for them.
 605          */
 606         for (comp = RLM_COMPONENT_AUTH; comp < RLM_COMPONENT_COUNT; comp++) {
 607                 int             value;
 608                 const char      *name2;
 609                 DICT_ATTR       *dattr;
 610                 DICT_VALUE      *dval;
 611                 CONF_SECTION    *subcs;
 612                 CONF_ITEM       *ci;
 613
 614                 /*
 615                  *      Not needed, don't load it.
 616                  */
 617                 if (!do_component[comp]) {
 618                         continue;
 619                 }
 620                 subcs = cf_section_sub_find(cs,
 621                                             section_type_value[comp].section);
 622
 623                 /*
 624                  *      FIXME: This is probably an error.
 625                  */
 626                 if (!subcs) continue;
 627
 628                 for (ci = cf_item_find_next(subcs, NULL);
 629                      ci != NULL;
 630                      ci = cf_item_find_next(subcs, ci)) {
 631                         if (cf_item_is_section(ci)) {
 632                                 const char *name1;
 633                                 CONF_SECTION *type;
 634
 635                                 type = cf_itemtosection(ci);
 636                                 name1 = cf_section_name1(type);
 637
 638                                 /*
 639                                  *      Not Autz-Type, Auth-Type, etc.
 640                                  */
 641                                 if (strcmp(name1, section_type_value[comp].typename) != 0) {
 642                                         continue;
 643                                 }
 644
 645                                 name2 = cf_section_name2(cf_itemtosection(ci));
 646
 647                                 /*
 648                                  *      FIXME: This is probably an error.
 649                                  */
 650                                 if (!name2) continue;
 651
 652                         } else if (section_type_value[comp].attr != PW_AUTH_TYPE) {
 653                                 /*
 654                                  *      Create types for names only when
 655                                  *      parsing the authenticate section.
 656                                  */
 657                                 continue;
 658
 659                         } else {
 660                                 name2 = cf_pair_attr(cf_itemtopair(ci));
 661                         }
 662
 663                         /*
 664                          *      If the value already exists, don't
 665                          *      create it again.
 666                          */
 667                         dval = dict_valbyname(section_type_value[comp].attr,
 668                                               name2);
 669                         if (dval) continue;
 670
 671                         /*
 672                          *      Find the attribute for the value.
 673                          */
 674                         dattr = dict_attrbyvalue(section_type_value[comp].attr);
 675                         if (!dattr) {
 676                                 radlog(L_ERR, "%s[%d]: No such attribute %s",
 677                                        mainconfig.radiusd_conf,
 678                                        cf_section_lineno(subcs),
 679                                        section_type_value[comp].typename);
 680                                 continue;
 681                         }
 682
 683                         /*
 684                          *      Create a new unique value with a
 685                          *      meaningless number.  You can't look at
 686                          *      it from outside of this code, so it
 687                          *      doesn't matter.  The only requirement
 688                          *      is that it's unique.
 689                          */
 690                         do {
 691                                 value = lrad_rand() & 0x00ffffff;
 692                         } while (dict_valbyattr(dattr->attr, value));
 693
 694                         if (dict_addvalue(name2, dattr->name, value) < 0) {
 695                                 radlog(L_ERR, "%s", librad_errstr);
 696                                 return -1;
 697                         }
 698                 }
 699         } /* over the sections which can have redundent sub-sections */
 700
 701         DEBUG2(" modules {");
 702
 703         /*
 704          *      Loop over all of the known components, finding their
 705          *      configuration section, and loading it.
 706          */
 707         for (comp = 0; comp < RLM_COMPONENT_COUNT; ++comp) {
 708                 CONF_SECTION *subcs;
 709
 710                 if (!do_component[comp]) continue;
 711
 712                 subcs = cf_section_sub_find(cs,
 713                                             section_type_value[comp].section);
 714                 if (!subcs) continue;
 715
 716                 if (cf_item_find_next(subcs, NULL) == NULL) continue;
 717
 718                 DEBUG2(" Module: Checking %s {...} for more modules to load",
 719                        section_type_value[comp].section);
 720
 721                 if (load_component_section(NULL, subcs, space, comp) < 0) {
 722                         DEBUG2(" }");
 723                         return -1;
 724                 }
 725         } /* loop over components */
 726
 727         DEBUG2(" }");
 728
 729         return 0;
 730 }
 731
 732 /*
 733  *      Parse the module config sections, and load
 734  *      and call each module's init() function.
 735  *
 736  *      Libtool makes your life a LOT easier, especially with libltdl.
 737  *      see: http://www.gnu.org/software/libtool/
 738  */
 739 int setup_modules(int reload, CONF_SECTION *config)
 740 {
 741         int             comp;
 742         CONF_SECTION    *cs, *modules;
 743         int             do_component[RLM_COMPONENT_COUNT];
 744         rad_listen_t    *listener;
 745
 746         /*
 747          *      If necessary, initialize libltdl.
 748          */
 749         if (!reload) {
 750                 /*
 751                  *      Set the default list of preloaded symbols.
 752                  *      This is used to initialize libltdl's list of
 753                  *      preloaded modules.
 754                  *
 755                  *      i.e. Static modules.
 756                  */
 757                 LTDL_SET_PRELOADED_SYMBOLS();
 758
 759                 if (lt_dlinit() != 0) {
 760                         radlog(L_ERR|L_CONS, "Failed to initialize libraries: %s\n",
 761                                         lt_dlerror());
 762                         return -1;
 763                 }
 764
 765                 /*
 766                  *      Set the search path to ONLY our library directory.
 767                  *      This prevents the modules from being found from
 768                  *      any location on the disk.
 769                  */
 770                 lt_dlsetsearchpath(radlib_dir);
 771
 772                 DEBUG2("radiusd: Library search path is %s",
 773                        lt_dlgetsearchpath());
 774
 775                 /*
 776                  *      Set up the internal module struct.
 777                  */
 778                 module_tree = rbtree_create(module_entry_cmp,
 779                                             module_entry_free, 0);
 780                 if (!module_tree) {
 781                         radlog(L_ERR|L_CONS, "Failed to initialize modules\n");
 782                         return -1;
 783                 }
 784         } else {
 785                 rbtree_free(components);
 786         }
 787
 788         components = rbtree_create(indexed_modcallable_cmp,
 789                                    indexed_modcallable_free, 0);
 790         if (!components) {
 791                 radlog(L_ERR|L_CONS, "Failed to initialize components\n");
 792                 return -1;
 793         }
 794
 795         /*
 796          *      Figure out which sections to load.
 797          */
 798         memset(do_component, 0, sizeof(do_component));
 799         for (listener = mainconfig.listen;
 800              listener != NULL;
 801              listener = listener->next) {
 802                 switch (listener->type) {
 803                 case RAD_LISTEN_AUTH:
 804                         do_component[RLM_COMPONENT_AUTZ] = 1;
 805                         do_component[RLM_COMPONENT_AUTH] = 1;
 806                         do_component[RLM_COMPONENT_POST_AUTH] = 1;
 807                         do_component[RLM_COMPONENT_SESS] = 1;
 808                         break;
 809
 810                 case RAD_LISTEN_DETAIL: /* just like acct */
 811                 case RAD_LISTEN_ACCT:
 812                         do_component[RLM_COMPONENT_PREACCT] = 1;
 813                         do_component[RLM_COMPONENT_ACCT] = 1;
 814                         break;
 815
 816                 case RAD_LISTEN_PROXY:
 817                         do_component[RLM_COMPONENT_PRE_PROXY] = 1;
 818                         do_component[RLM_COMPONENT_POST_PROXY] = 1;
 819                         break;
 820
 821                 case RAD_LISTEN_VQP:
 822                         do_component[RLM_COMPONENT_POST_AUTH] = 1;
 823                         break;
 824                         /*
 825                          *      Ignore this.
 826                          */
 827                 case RAD_LISTEN_SNMP:
 828                         break;
 829
 830                 default:
 831                         rad_assert(0 == 1);
 832                         break;
 833                 }
 834         }
 835
 836         for (comp = RLM_COMPONENT_AUTH; comp < RLM_COMPONENT_COUNT; comp++) {
 837                 /*
 838                  *      Have the debugging messages all in one place.
 839                  */
 840                 if (!do_component[comp]) {
 841                         DEBUG2("modules: Not loading %s{} section",
 842                                section_type_value[comp].section);
 843                 }
 844         }
 845
 846         /*
 847          *      Remember where the modules were stored.
 848          */
 849         modules = cf_section_sub_find(config, "modules");
 850         if (!modules) {
 851                 radlog(L_ERR, "Cannot find a \"modules\" section in the configuration file!");
 852                 return -1;
 853         }
 854
 855         /*
 856          *  Look for the 'instantiate' section, which tells us
 857          *  the instantiation order of the modules, and also allows
 858          *  us to load modules with no authorize/authenticate/etc.
 859          *  sections.
 860          */
 861         cs = cf_section_sub_find(config, "instantiate");
 862         if (cs != NULL) {
 863                 CONF_ITEM *ci;
 864                 CONF_PAIR *cp;
 865                 module_instance_t *module;
 866                 const char *name;
 867
 868                 DEBUG2(" instantiate {");
 869
 870                 /*
 871                  *  Loop over the items in the 'instantiate' section.
 872                  */
 873                 for (ci=cf_item_find_next(cs, NULL);
 874                      ci != NULL;
 875                      ci=cf_item_find_next(cs, ci)) {
 876
 877                         /*
 878                          *      Skip sections.  They'll be handled
 879                          *      later, if they're referenced at all...
 880                          */
 881                         if (cf_item_is_section(ci)) {
 882                                 continue;
 883                         }
 884
 885                         cp = cf_itemtopair(ci);
 886                         name = cf_pair_attr(cp);
 887                         module = find_module_instance(modules, name);
 888                         if (!module) {
 889                                 return -1;
 890                         }
 891                 } /* loop over items in the subsection */
 892
 893                 DEBUG2(" }");
 894         } /* if there's an 'instantiate' section. */
 895
 896         /*
 897          *      Load *all*.  If you don't want one loaded, don't list
 898          *      it in sites-enabled/
 899          */
 900         for (listener = mainconfig.listen;
 901              listener != NULL;
 902              listener = listener->next) {
 903                 if (listener->type != RAD_LISTEN_VQP) continue;
 904
 905                 cs = cf_section_sub_find(config, "vmps");
 906                 if (!cs) {
 907                         radlog(L_ERR, "Listening on vmps socket, but no vmps section");
 908                         return -1;
 909                 }
 910
 911                 if (cf_item_find_next(cs, NULL) == NULL) {
 912                         radlog(L_ERR, "Listening on vmps socket, vmps section is empty");
 913                         return -1;
 914                 }
 915
 916                 DEBUG2(" Module: Checking vmps {...} for more modules to load");
 917
 918                 if (load_component_section(NULL, cs, VMPS_SPACE,
 919                                            RLM_COMPONENT_POST_AUTH) < 0) {
 920                         return -1;
 921                 }
 922         }
 923
 924         /*
 925          *      Load all of the virtual servers.
 926          */
 927         for (cs = cf_subsection_find_next(config, NULL, "server");
 928              cs != NULL;
 929              cs = cf_subsection_find_next(config, cs, "server")) {
 930                 const char *name2 = cf_section_name2(cs);
 931
 932                 DEBUG2("server %s {", name2);
 933                 if (load_byspace(cs, name2, do_component) < 0) {
 934                         DEBUG2("}");
 935                         return -1;
 936                 }
 937                 DEBUG2("}");
 938         }
 939
 940         if (load_byspace(config, NULL, do_component) < 0) {
 941                 return -1;
 942         }
 943
 944
 945         return 0;
 946 }
 947
 948 /*
 949  *      Call all authorization modules until one returns
 950  *      somethings else than RLM_MODULE_OK
 951  */
 952 int module_authorize(int autz_type, REQUEST *request)
 953 {
 954         return indexed_modcall(request->server,
 955                                RLM_COMPONENT_AUTZ, autz_type, request);
 956 }
 957
 958 /*
 959  *      Authenticate a user/password with various methods.
 960  */
 961 int module_authenticate(int auth_type, REQUEST *request)
 962 {
 963         return indexed_modcall(request->server,
 964                                RLM_COMPONENT_AUTH, auth_type, request);
 965 }
 966
 967 /*
 968  *      Do pre-accounting for ALL configured sessions
 969  */
 970 int module_preacct(REQUEST *request)
 971 {
 972         return indexed_modcall(request->server,
 973                                RLM_COMPONENT_PREACCT, 0, request);
 974 }
 975
 976 /*
 977  *      Do accounting for ALL configured sessions
 978  */
 979 int module_accounting(int acct_type, REQUEST *request)
 980 {
 981         return indexed_modcall(request->server,
 982                                RLM_COMPONENT_ACCT, acct_type, request);
 983 }
 984
 985 /*
 986  *      See if a user is already logged in.
 987  *
 988  *      Returns: 0 == OK, 1 == double logins, 2 == multilink attempt
 989  */
 990 int module_checksimul(int sess_type, REQUEST *request, int maxsimul)
 991 {
 992         int rcode;
 993
 994         if(!request->username)
 995                 return 0;
 996
 997         request->simul_count = 0;
 998         request->simul_max = maxsimul;
 999         request->simul_mpp = 1;
1000
1001         rcode = indexed_modcall(request->server,
1002                                 RLM_COMPONENT_SESS, sess_type, request);
1003
1004         if (rcode != RLM_MODULE_OK) {
1005                 /* FIXME: Good spot for a *rate-limited* warning to the log */
1006                 return 0;
1007         }
1008
1009         return (request->simul_count < maxsimul) ? 0 : request->simul_mpp;
1010 }
1011
1012 /*
1013  *      Do pre-proxying for ALL configured sessions
1014  */
1015 int module_pre_proxy(int type, REQUEST *request)
1016 {
1017         return indexed_modcall(request->server,
1018                                RLM_COMPONENT_PRE_PROXY, type, request);
1019 }
1020
1021 /*
1022  *      Do post-proxying for ALL configured sessions
1023  */
1024 int module_post_proxy(int type, REQUEST *request)
1025 {
1026         return indexed_modcall(request->server,
1027                                RLM_COMPONENT_POST_PROXY, type, request);
1028 }
1029
1030 /*
1031  *      Do post-authentication for ALL configured sessions
1032  */
1033 int module_post_auth(int postauth_type, REQUEST *request)
1034 {
1035         return indexed_modcall(request->server,
1036                                RLM_COMPONENT_POST_AUTH, postauth_type, request);
1037 }
1038
1039 /*
1040  *      Do VMPS
1041  */
1042 int module_vmps(REQUEST *request)
1043 {
1044         return indexed_modcall(VMPS_SPACE, RLM_COMPONENT_POST_AUTH, 0,
1045                                request);
1046 }