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         rcode = strcmp(a->space, b->space);
  85         if (rcode != 0) return rcode;
  86
  87         if (a->comp < b->comp) return -1;
  88         if (a->comp >  b->comp) return +1;
  89
  90         return a->idx - b->idx;
  91 }
  92
  93
  94 /*
  95  *      Free a module instance.
  96  */
  97 static void module_instance_free(void *data)
  98 {
  99         module_instance_t *this = data;
 100
 101         if (this->entry->module->detach)
 102                 (this->entry->module->detach)(this->insthandle);
 103 #ifdef HAVE_PTHREAD_H
 104         if (this->mutex) {
 105                 /*
 106                  *      FIXME
 107                  *      The mutex MIGHT be locked...
 108                  *      we'll check for that later, I guess.
 109                  */
 110                 pthread_mutex_destroy(this->mutex);
 111                 free(this->mutex);
 112         }
 113 #endif
 114         free(this);
 115 }
 116
 117
 118 /*
 119  *      Compare two module entries
 120  */
 121 static int module_entry_cmp(const void *one, const void *two)
 122 {
 123         const module_entry_t *a = one;
 124         const module_entry_t *b = two;
 125
 126         return strcmp(a->name, b->name);
 127 }
 128
 129 /*
 130  *      Free a module entry.
 131  */
 132 static void module_entry_free(void *data)
 133 {
 134         module_entry_t *this = data;
 135
 136         lt_dlclose(this->handle);       /* ignore any errors */
 137         free(this);
 138 }
 139
 140
 141 /*
 142  *      Remove the module lists.
 143  */
 144 int detach_modules(void)
 145 {
 146         rbtree_free(components);
 147         rbtree_free(module_tree);
 148
 149         return 0;
 150 }
 151
 152
 153 /*
 154  *      Find a module on disk or in memory, and link to it.
 155  */
 156 static module_entry_t *linkto_module(const char *module_name,
 157                                      const char *cffilename, int cflineno)
 158 {
 159         module_entry_t myentry;
 160         module_entry_t *node;
 161         lt_dlhandle handle;
 162         char module_struct[256];
 163         char *p;
 164         const void *module;
 165
 166         strlcpy(myentry.name, module_name, sizeof(myentry.name));
 167         node = rbtree_finddata(module_tree, &myentry);
 168         if (node) return node;
 169
 170         /*
 171          *      Keep the handle around so we can dlclose() it.
 172          */
 173         handle = lt_dlopenext(module_name);
 174         if (handle == NULL) {
 175                 radlog(L_ERR|L_CONS, "%s[%d] Failed to link to module '%s':"
 176                        " %s\n", cffilename, cflineno, module_name, lt_dlerror());
 177                 return NULL;
 178         }
 179
 180         /*
 181          *      Link to the module's rlm_FOO{} module structure.
 182          *
 183          *      The module_name variable has the version number
 184          *      embedded in it, and we don't want that here.
 185          */
 186         strcpy(module_struct, module_name);
 187         p = strrchr(module_struct, '-');
 188         if (p) *p = '\0';
 189
 190         DEBUG3("    (Loaded %s, checking if it's valid)", module_name);
 191
 192         /*
 193          *      libltld MAY core here, if the handle it gives us contains
 194          *      garbage data.
 195          */
 196         module = lt_dlsym(handle, module_struct);
 197         if (!module) {
 198                 radlog(L_ERR|L_CONS, "%s[%d] Failed linking to "
 199                                 "%s structure in %s: %s\n",
 200                                 cffilename, cflineno,
 201                                 module_name, cffilename, lt_dlerror());
 202                 lt_dlclose(handle);
 203                 return NULL;
 204         }
 205         /*
 206          *      Before doing anything else, check if it's sane.
 207          */
 208         if ((*(const uint32_t *) module) != RLM_MODULE_MAGIC_NUMBER) {
 209                 lt_dlclose(handle);
 210                 radlog(L_ERR|L_CONS, "%s[%d] Invalid version in module '%s'",
 211                        cffilename, cflineno, module_name);
 212                 return NULL;
 213
 214         }
 215
 216         /* make room for the module type */
 217         node = rad_malloc(sizeof(*node));
 218         memset(node, 0, sizeof(*node));
 219         strlcpy(node->name, module_name, sizeof(node->name));
 220         node->module = module;
 221         node->handle = handle;
 222
 223         DEBUG(" Module: Linked to module %s", module_name);
 224
 225         /*
 226          *      Add the module as "rlm_foo-version" to the configuration
 227          *      section.
 228          */
 229         if (!rbtree_insert(module_tree, node)) {
 230                 radlog(L_ERR, "Failed to cache module %s", module_name);
 231                 lt_dlclose(handle);
 232                 free(node);
 233                 return NULL;
 234         }
 235
 236         return node;
 237 }
 238
 239 /*
 240  *      Find a module instance.
 241  */
 242 module_instance_t *find_module_instance(CONF_SECTION *modules,
 243                                         const char *instname)
 244 {
 245         CONF_SECTION *cs;
 246         const char *name1, *name2;
 247         module_instance_t *node;
 248         char module_name[256];
 249
 250         if (!modules) return NULL;
 251
 252         /*
 253          *      Module instances are declared in the modules{} block
 254          *      and referenced later by their name, which is the
 255          *      name2 from the config section, or name1 if there was
 256          *      no name2.
 257          */
 258         cs = cf_section_sub_find_name2(modules, NULL, instname);
 259         if (cs == NULL) {
 260                 radlog(L_ERR|L_CONS, "ERROR: Cannot find a configuration entry for module \"%s\".\n", instname);
 261                 return NULL;
 262         }
 263
 264         /*
 265          *      If there's already a module instance, return it.
 266          */
 267         node = cf_data_find(cs, "instance");
 268         if (node) return node;
 269
 270         name1 = cf_section_name1(cs);
 271         name2 = cf_section_name2(cs);
 272
 273         /*
 274          *      Found the configuration entry.
 275          */
 276         node = rad_malloc(sizeof(*node));
 277         memset(node, 0, sizeof(*node));
 278
 279         node->insthandle = NULL;
 280
 281         /*
 282          *      Names in the "modules" section aren't prefixed
 283          *      with "rlm_", so we add it here.
 284          */
 285         snprintf(module_name, sizeof(module_name), "rlm_%s", name1);
 286
 287         node->entry = linkto_module(module_name,
 288                                     mainconfig.radiusd_conf,
 289                                     cf_section_lineno(cs));
 290         if (!node->entry) {
 291                 free(node);
 292                 /* linkto_module logs any errors */
 293                 return NULL;
 294         }
 295
 296         DEBUG2(" Module: Instantiating %s", instname);
 297
 298         /*
 299          *      Call the module's instantiation routine.
 300          */
 301         if ((node->entry->module->instantiate) &&
 302             ((node->entry->module->instantiate)(cs, &node->insthandle) < 0)) {
 303                 radlog(L_ERR|L_CONS,
 304                                 "%s[%d]: %s: Module instantiation failed.\n",
 305                        mainconfig.radiusd_conf, cf_section_lineno(cs),
 306                        instname);
 307                 free(node);
 308                 return NULL;
 309         }
 310
 311         /*
 312          *      We're done.  Fill in the rest of the data structure,
 313          *      and link it to the module instance list.
 314          */
 315         strlcpy(node->name, instname, sizeof(node->name));
 316
 317 #ifdef HAVE_PTHREAD_H
 318         /*
 319          *      If we're threaded, check if the module is thread-safe.
 320          *
 321          *      If it isn't, we create a mutex.
 322          */
 323         if ((node->entry->module->type & RLM_TYPE_THREAD_UNSAFE) != 0) {
 324                 node->mutex = (pthread_mutex_t *) rad_malloc(sizeof(pthread_mutex_t));
 325                 /*
 326                  *      Initialize the mutex.
 327                  */
 328                 pthread_mutex_init(node->mutex, NULL);
 329         } else {
 330                 /*
 331                  *      The module is thread-safe.  Don't give it a mutex.
 332                  */
 333                 node->mutex = NULL;
 334         }
 335
 336 #endif
 337         cf_data_add(cs, "instance", node, module_instance_free);
 338
 339         return node;
 340 }
 341
 342 static indexed_modcallable *lookup_by_index(const char *space, int comp,
 343                                             int idx)
 344 {
 345         indexed_modcallable myc;
 346
 347         myc.comp = comp;
 348         myc.idx = idx;
 349         myc.space = space;
 350
 351         return rbtree_finddata(components, &myc);
 352 }
 353
 354 /*
 355  *      Create a new sublist.
 356  */
 357 static indexed_modcallable *new_sublist(const char *space, int comp, int idx)
 358 {
 359         indexed_modcallable *c;
 360
 361         c = lookup_by_index(space, comp, idx);
 362
 363         /* It is an error to try to create a sublist that already
 364          * exists. It would almost certainly be caused by accidental
 365          * duplication in the config file.
 366          *
 367          * index 0 is the exception, because it is used when we want
 368          * to collect _all_ listed modules under a single index by
 369          * default, which is currently the case in all components
 370          * except authenticate. */
 371         if (c) {
 372                 if (idx == 0) {
 373                         return c;
 374                 }
 375                 return NULL;
 376         }
 377
 378         c = rad_malloc(sizeof(*c));
 379         c->modulelist = NULL;
 380         c->space = space;
 381         c->comp = comp;
 382         c->idx = idx;
 383
 384         if (!rbtree_insert(components, c)) {
 385                 free(c);
 386                 return NULL;
 387         }
 388
 389         return c;
 390 }
 391
 392 static int indexed_modcall(const char *space, int comp, int idx,
 393                            REQUEST *request)
 394 {
 395         int rcode;
 396         indexed_modcallable *this;
 397         modcallable *list = NULL;
 398
 399         this = lookup_by_index(space, comp, idx);
 400         if (!this) {
 401                 if (idx != 0) DEBUG2("  ERROR: Unknown value specified for %s.  Cannot perform requested action.",
 402                                      section_type_value[comp].typename);
 403         } else {
 404                 list = this->modulelist;
 405         }
 406
 407         request->component = section_type_value[comp].section;
 408
 409         rcode = modcall(comp, list, request);
 410
 411         request->module = "<server-core>";
 412         request->component = "<server-core>";
 413         return rcode;
 414 }
 415
 416 /*
 417  *      Load a sub-module list, as found inside an Auth-Type foo {}
 418  *      block
 419  */
 420 static int load_subcomponent_section(modcallable *parent, CONF_SECTION *cs,
 421                                      const char *space,
 422                                      int comp, const char *filename)
 423 {
 424         indexed_modcallable *subcomp;
 425         modcallable *ml;
 426         DICT_VALUE *dval;
 427         const char *name2 = cf_section_name2(cs);
 428
 429         rad_assert(comp >= RLM_COMPONENT_AUTH);
 430         rad_assert(comp <= RLM_COMPONENT_COUNT);
 431
 432         /*
 433          *      Sanity check.
 434          */
 435         if (!name2) {
 436                 radlog(L_ERR|L_CONS,
 437                        "%s[%d]: No name specified for %s block",
 438                        filename, cf_section_lineno(cs),
 439                        section_type_value[comp].typename);
 440                 return 1;
 441         }
 442
 443         /*
 444          *      Compile the group.
 445          */
 446         ml = compile_modgroup(parent, comp, cs, filename);
 447         if (!ml) {
 448                 return 0;
 449         }
 450
 451         /*
 452          *      We must assign a numeric index to this subcomponent.
 453          *      It is generated and placed in the dictionary by
 454          *      setup_modules(), when it loads the sections.  If it
 455          *      isn't found, it's a serious error.
 456          */
 457         dval = dict_valbyname(section_type_value[comp].attr, name2);
 458         if (!dval) {
 459                 radlog(L_ERR|L_CONS,
 460                        "%s[%d] %s %s Not previously configured",
 461                        filename, cf_section_lineno(cs),
 462                        section_type_value[comp].typename, name2);
 463                 modcallable_free(&ml);
 464                 return 0;
 465         }
 466
 467         subcomp = new_sublist(space, comp, dval->value);
 468         if (!subcomp) {
 469                 modcallable_free(&ml);
 470                 return 1;
 471         }
 472
 473         subcomp->modulelist = ml;
 474         return 1;               /* OK */
 475 }
 476
 477 static int load_component_section(modcallable *parent, CONF_SECTION *cs,
 478                                   const char *space, int comp,
 479                                   const char *filename)
 480 {
 481         modcallable *this;
 482         CONF_ITEM *modref;
 483         int idx;
 484         indexed_modcallable *subcomp;
 485         const char *modname;
 486         const char *visiblename;
 487
 488         /*
 489          *      Loop over the entries in the named section.
 490          */
 491         for (modref = cf_item_find_next(cs, NULL);
 492              modref != NULL;
 493              modref = cf_item_find_next(cs, modref)) {
 494                 CONF_PAIR *cp = NULL;
 495                 CONF_SECTION *scs = NULL;
 496
 497                 /*
 498                  *      Look for Auth-Type foo {}, which are special
 499                  *      cases of named sections, and allowable ONLY
 500                  *      at the top-level.
 501                  *
 502                  *      i.e. They're not allowed in a "group" or "redundant"
 503                  *      subsection.
 504                  */
 505                 if (cf_item_is_section(modref)) {
 506                         const char *sec_name;
 507                         scs = cf_itemtosection(modref);
 508
 509                         sec_name = cf_section_name1(scs);
 510
 511                         if (strcmp(sec_name,
 512                                    section_type_value[comp].typename) == 0) {
 513                                 if (!load_subcomponent_section(parent, scs,
 514                                                                space, comp,
 515                                                                filename)) {
 516                                         return -1; /* FIXME: memleak? */
 517                                 }
 518                                 continue;
 519                         }
 520
 521                         cp = NULL;
 522                 } else if (cf_item_is_pair(modref)) {
 523                         cp = cf_itemtopair(modref);
 524                 } else {
 525                         continue; /* ignore it */
 526                 }
 527
 528                 /*
 529                  *      Try to compile one entry.
 530                  */
 531                 this = compile_modsingle(parent, comp, modref, filename,
 532                                          &modname);
 533                 if (!this) {
 534                         radlog(L_ERR|L_CONS,
 535                                "%s[%d] Failed to parse %s section.\n",
 536                                filename, 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                         int lineno = 0;
 545
 546                         if (cp) {
 547                                 modrefname = cf_pair_attr(cp);
 548                                 lineno = cf_pair_lineno(cp);
 549                         } else {
 550                                 modrefname = cf_section_name2(scs);
 551                                 lineno = cf_section_lineno(scs);
 552                                 if (!modrefname) {
 553                                         radlog(L_ERR|L_CONS,
 554                                                "%s[%d] Failed to parse %s sub-section.\n",
 555                                                filename, lineno,
 556                                                cf_section_name1(scs));
 557                                         return -1;
 558                                 }
 559                         }
 560
 561                         dval = dict_valbyname(PW_AUTH_TYPE, modrefname);
 562                         if (!dval) {
 563                                 /*
 564                                  *      It's a section, but nothing we
 565                                  *      recognize.  Die!
 566                                  */
 567                                 radlog(L_ERR|L_CONS, "%s[%d] Unknown Auth-Type \"%s\" in %s sub-section.",
 568                                        filename, lineno,
 569                                        modrefname, section_type_value[comp].section);
 570                                 return -1;
 571                         }
 572                         idx = dval->value;
 573                 } else {
 574                         /* See the comment in new_sublist() for explanation
 575                          * of the special index 0 */
 576                         idx = 0;
 577                 }
 578
 579                 subcomp = new_sublist(space, comp, idx);
 580                 if (subcomp == NULL) {
 581                         modcallable_free(&this);
 582                         continue;
 583                 }
 584
 585                 /* If subcomp->modulelist is NULL, add_to_modcallable will
 586                  * create it */
 587                 visiblename = cf_section_name2(cs);
 588                 if (visiblename == NULL)
 589                         visiblename = cf_section_name1(cs);
 590                 add_to_modcallable(&subcomp->modulelist, this,
 591                                    comp, visiblename);
 592         }
 593
 594         return 0;
 595 }
 596
 597 static int load_byspace(CONF_SECTION *cs, const char *space,
 598                         int *do_component)
 599 {
 600         int comp;
 601
 602         DEBUG2(" modules {");
 603
 604         /*
 605          *      Loop over all of the known components, finding their
 606          *      configuration section, and loading it.
 607          */
 608         for (comp = 0; comp < RLM_COMPONENT_COUNT; ++comp) {
 609                 CONF_SECTION *subcs;
 610
 611                 if (!do_component[comp]) continue;
 612
 613                 subcs = cf_section_sub_find(cs,
 614                                             section_type_value[comp].section);
 615                 if (!subcs) continue;
 616
 617                 if (cf_item_find_next(subcs, NULL) == NULL) continue;
 618
 619                 DEBUG2(" Module: Checking %s {...} for more modules to load",
 620                        section_type_value[comp].section);
 621
 622                 if (load_component_section(NULL, subcs, space, comp,
 623                                            mainconfig.radiusd_conf) < 0) {
 624                         DEBUG2(" }");
 625                         return -1;
 626                 }
 627         } /* loop over components */
 628
 629         DEBUG2(" }");
 630
 631         return 0;
 632 }
 633
 634 /*
 635  *      Parse the module config sections, and load
 636  *      and call each module's init() function.
 637  *
 638  *      Libtool makes your life a LOT easier, especially with libltdl.
 639  *      see: http://www.gnu.org/software/libtool/
 640  */
 641 int setup_modules(int reload)
 642 {
 643         int             comp;
 644         CONF_SECTION    *cs, *modules;
 645         int             do_component[RLM_COMPONENT_COUNT];
 646         rad_listen_t    *listener;
 647
 648         /*
 649          *      If necessary, initialize libltdl.
 650          */
 651         if (!reload) {
 652                 /*
 653                  *      Set the default list of preloaded symbols.
 654                  *      This is used to initialize libltdl's list of
 655                  *      preloaded modules.
 656                  *
 657                  *      i.e. Static modules.
 658                  */
 659                 LTDL_SET_PRELOADED_SYMBOLS();
 660
 661                 if (lt_dlinit() != 0) {
 662                         radlog(L_ERR|L_CONS, "Failed to initialize libraries: %s\n",
 663                                         lt_dlerror());
 664                         return -1;
 665                 }
 666
 667                 /*
 668                  *      Set the search path to ONLY our library directory.
 669                  *      This prevents the modules from being found from
 670                  *      any location on the disk.
 671                  */
 672                 lt_dlsetsearchpath(radlib_dir);
 673
 674                 DEBUG2("radiusd: Library search path is %s",
 675                        lt_dlgetsearchpath());
 676
 677                 /*
 678                  *      Set up the internal module struct.
 679                  */
 680                 module_tree = rbtree_create(module_entry_cmp,
 681                                             module_entry_free, 0);
 682                 if (!module_tree) {
 683                         radlog(L_ERR|L_CONS, "Failed to initialize modules\n");
 684                         return -1;
 685                 }
 686         } else {
 687                 rbtree_free(components);
 688         }
 689
 690         components = rbtree_create(indexed_modcallable_cmp,
 691                                    indexed_modcallable_free, 0);
 692         if (!components) {
 693                 radlog(L_ERR|L_CONS, "Failed to initialize components\n");
 694                 return -1;
 695         }
 696
 697         /*
 698          *      Figure out which sections to load.
 699          */
 700         memset(do_component, 0, sizeof(do_component));
 701         for (listener = mainconfig.listen;
 702              listener != NULL;
 703              listener = listener->next) {
 704                 switch (listener->type) {
 705                 case RAD_LISTEN_AUTH:
 706                         do_component[RLM_COMPONENT_AUTZ] = 1;
 707                         do_component[RLM_COMPONENT_AUTH] = 1;
 708                         do_component[RLM_COMPONENT_POST_AUTH] = 1;
 709                         do_component[RLM_COMPONENT_SESS] = 1;
 710                         break;
 711
 712                 case RAD_LISTEN_DETAIL: /* just like acct */
 713                 case RAD_LISTEN_ACCT:
 714                         do_component[RLM_COMPONENT_PREACCT] = 1;
 715                         do_component[RLM_COMPONENT_ACCT] = 1;
 716                         break;
 717
 718                 case RAD_LISTEN_PROXY:
 719                         do_component[RLM_COMPONENT_PRE_PROXY] = 1;
 720                         do_component[RLM_COMPONENT_POST_PROXY] = 1;
 721                         break;
 722
 723                 case RAD_LISTEN_VQP:
 724                         do_component[RLM_COMPONENT_POST_AUTH] = 1;
 725                         break;
 726                         /*
 727                          *      Ignore this.
 728                          */
 729                 case RAD_LISTEN_SNMP:
 730                         break;
 731
 732                 default:
 733                         rad_assert(0 == 1);
 734                         break;
 735                 }
 736         }
 737
 738         for (comp = RLM_COMPONENT_AUTH; comp < RLM_COMPONENT_COUNT; comp++) {
 739                 /*
 740                  *      Have the debugging messages all in one place.
 741                  */
 742                 if (!do_component[comp]) {
 743                         DEBUG2("modules: Not loading %s{} section",
 744                                section_type_value[comp].section);
 745                 }
 746         }
 747
 748         /*
 749          *      Create any DICT_VALUE's for the types.  See
 750          *      'doc/configurable_failover' for examples of 'authtype'
 751          *      used to create new Auth-Type values.  In order to
 752          *      let the user create new names, we've got to look for
 753          *      those names, and create DICT_VALUE's for them.
 754          */
 755         for (comp = RLM_COMPONENT_AUTH; comp < RLM_COMPONENT_COUNT; comp++) {
 756                 int             value;
 757                 const char      *name2;
 758                 DICT_ATTR       *dattr;
 759                 DICT_VALUE      *dval;
 760                 CONF_SECTION    *sub, *next;
 761                 CONF_PAIR       *cp;
 762
 763                 /*
 764                  *      Not needed, don't load it.
 765                  */
 766                 if (!do_component[comp]) {
 767                         continue;
 768                 }
 769                 cs = cf_section_find(section_type_value[comp].section);
 770
 771                 if (!cs) continue;
 772
 773                 sub = NULL;
 774                 do {
 775                         /*
 776                          *      See if there's a sub-section by that
 777                          *      name.
 778                          */
 779                         next = cf_subsection_find_next(cs, sub,
 780                                                        section_type_value[comp].typename);
 781                         sub = next;
 782
 783                         /*
 784                          *      If so, look for it to define a new
 785                          *      value.
 786                          */
 787                         name2 = cf_section_name2(sub);
 788                         if (!name2) continue;
 789
 790
 791                         /*
 792                          *      If the value already exists, don't
 793                          *      create it again.
 794                          */
 795                         dval = dict_valbyname(section_type_value[comp].attr,
 796                                               name2);
 797                         if (dval) continue;
 798
 799                         /*
 800                          *      Find the attribute for the value.
 801                          */
 802                         dattr = dict_attrbyvalue(section_type_value[comp].attr);
 803                         if (!dattr) {
 804                                 radlog(L_ERR, "%s[%d]: No such attribute %s",
 805                                        mainconfig.radiusd_conf,
 806                                        cf_section_lineno(sub),
 807                                        section_type_value[comp].typename);
 808                                 continue;
 809                         }
 810
 811                         /*
 812                          *      Create a new unique value with a
 813                          *      meaningless number.  You can't look at
 814                          *      it from outside of this code, so it
 815                          *      doesn't matter.  The only requirement
 816                          *      is that it's unique.
 817                          */
 818                         do {
 819                                 value = lrad_rand() & 0x00ffffff;
 820                         } while (dict_valbyattr(dattr->attr, value));
 821
 822                         if (dict_addvalue(name2, dattr->name, value) < 0) {
 823                                 radlog(L_ERR, "%s", librad_errstr);
 824                                 return -1;
 825                         }
 826                 } while (sub != NULL);
 827
 828                 /*
 829                  *      Loop over the non-sub-sections, too.
 830                  */
 831                 cp = NULL;
 832                 do {
 833                         /*
 834                          *      See if there's a conf-pair by that
 835                          *      name.
 836                          */
 837                         cp = cf_pair_find_next(cs, cp, NULL);
 838                         if (!cp) break;
 839
 840
 841                         /*
 842                          *      If the value already exists, don't
 843                          *      create it again.
 844                          */
 845                         name2 = cf_pair_attr(cp);
 846                         dval = dict_valbyname(section_type_value[comp].attr,
 847                                               name2);
 848                         if (dval) continue;
 849
 850                         /*
 851                          *      Find the attribute for the value.
 852                          */
 853                         dattr = dict_attrbyvalue(section_type_value[comp].attr);
 854                         if (!dattr) {
 855                                 radlog(L_ERR, "%s[%d]: No such attribute %s",
 856                                        mainconfig.radiusd_conf,
 857                                        cf_section_lineno(sub),
 858                                        section_type_value[comp].typename);
 859                                 continue;
 860                         }
 861
 862                         /*
 863                          *      Finally, create the new attribute.
 864                          */
 865                         do {
 866                                 value = lrad_rand() & 0x00ffffff;
 867                         } while (dict_valbyattr(dattr->attr, value));
 868                         if (dict_addvalue(name2, dattr->name, value) < 0) {
 869                                 radlog(L_ERR, "%s", librad_errstr);
 870                                 return -1;
 871                         }
 872                 } while (cp != NULL);
 873         } /* over the sections which can have redundent sub-sections */
 874
 875         /*
 876          *      Remember where the modules were stored.
 877          */
 878         modules = cf_section_find("modules");
 879         if (!modules) {
 880                 radlog(L_ERR, "Cannot find a \"modules\" section in the configuration file!");
 881                 return -1;
 882         }
 883
 884         /*
 885          *  Look for the 'instantiate' section, which tells us
 886          *  the instantiation order of the modules, and also allows
 887          *  us to load modules with no authorize/authenticate/etc.
 888          *  sections.
 889          */
 890         cs = cf_section_find("instantiate");
 891         if (cs != NULL) {
 892                 CONF_ITEM *ci;
 893                 CONF_PAIR *cp;
 894                 module_instance_t *module;
 895                 const char *name;
 896
 897                 DEBUG2(" instantiate {");
 898
 899                 /*
 900                  *  Loop over the items in the 'instantiate' section.
 901                  */
 902                 for (ci=cf_item_find_next(cs, NULL);
 903                      ci != NULL;
 904                      ci=cf_item_find_next(cs, ci)) {
 905
 906                         /*
 907                          *      Skip sections.  They'll be handled
 908                          *      later, if they're referenced at all...
 909                          */
 910                         if (cf_item_is_section(ci)) {
 911                                 continue;
 912                         }
 913
 914                         cp = cf_itemtopair(ci);
 915                         name = cf_pair_attr(cp);
 916                         module = find_module_instance(modules, name);
 917                         if (!module) {
 918                                 return -1;
 919                         }
 920                 } /* loop over items in the subsection */
 921
 922                 DEBUG2(" }");
 923         } /* if there's an 'instantiate' section. */
 924
 925         if (load_byspace(mainconfig.config, NULL, do_component) < 0) {
 926                 return -1;
 927         }
 928
 929         /*
 930          *      Load by identities, and by vmps.
 931          */
 932         for (listener = mainconfig.listen;
 933              listener != NULL;
 934              listener = listener->next) {
 935                 if (listener->type == RAD_LISTEN_VQP) {
 936                         cs = cf_section_find("vmps");
 937                         if (!cs) {
 938                                 radlog(L_ERR, "Listening on vmps socket, but no vmps section");
 939                                 return -1;
 940                         }
 941
 942                         if (cf_item_find_next(cs, NULL) == NULL) {
 943                                 radlog(L_ERR, "Listening on vmps socket, vmps section is empty");
 944                                 return -1;
 945                         }
 946
 947                         DEBUG2(" Module: Checking vmps {...} for more modules to load");
 948
 949                         if (load_component_section(NULL, cs, VMPS_SPACE,
 950                                                    RLM_COMPONENT_POST_AUTH,
 951                                                    mainconfig.radiusd_conf) < 0) {
 952                                 return -1;
 953                         }
 954
 955                         continue;
 956                 }
 957
 958                 if (!listener->identity) continue;
 959
 960                 /*
 961                  *      Load by identity
 962                  */
 963                 cs = cf_section_sub_find_name2(mainconfig.config,
 964                                                "identity", listener->identity);
 965                 if (!cs) continue;
 966
 967                 DEBUG2("identity %s {", listener->identity);
 968                 if (load_byspace(cs, listener->identity, do_component) < 0) {
 969                         DEBUG2("}");
 970                         return -1;
 971                 }
 972                 DEBUG2("}");
 973         }
 974
 975         return 0;
 976 }
 977
 978 /*
 979  *      Call all authorization modules until one returns
 980  *      somethings else than RLM_MODULE_OK
 981  */
 982 int module_authorize(int autz_type, REQUEST *request)
 983 {
 984         return indexed_modcall(request->listener->identity,
 985                                RLM_COMPONENT_AUTZ, autz_type, request);
 986 }
 987
 988 /*
 989  *      Authenticate a user/password with various methods.
 990  */
 991 int module_authenticate(int auth_type, REQUEST *request)
 992 {
 993         return indexed_modcall(request->listener->identity,
 994                                RLM_COMPONENT_AUTH, auth_type, request);
 995 }
 996
 997 /*
 998  *      Do pre-accounting for ALL configured sessions
 999  */
1000 int module_preacct(REQUEST *request)
1001 {
1002         return indexed_modcall(request->listener->identity,
1003                                RLM_COMPONENT_PREACCT, 0, request);
1004 }
1005
1006 /*
1007  *      Do accounting for ALL configured sessions
1008  */
1009 int module_accounting(int acct_type, REQUEST *request)
1010 {
1011         return indexed_modcall(request->listener->identity,
1012                                RLM_COMPONENT_ACCT, acct_type, request);
1013 }
1014
1015 /*
1016  *      See if a user is already logged in.
1017  *
1018  *      Returns: 0 == OK, 1 == double logins, 2 == multilink attempt
1019  */
1020 int module_checksimul(int sess_type, REQUEST *request, int maxsimul)
1021 {
1022         int rcode;
1023
1024         if(!request->username)
1025                 return 0;
1026
1027         request->simul_count = 0;
1028         request->simul_max = maxsimul;
1029         request->simul_mpp = 1;
1030
1031         rcode = indexed_modcall(request->listener->identity,
1032                                 RLM_COMPONENT_SESS, sess_type, request);
1033
1034         if (rcode != RLM_MODULE_OK) {
1035                 /* FIXME: Good spot for a *rate-limited* warning to the log */
1036                 return 0;
1037         }
1038
1039         return (request->simul_count < maxsimul) ? 0 : request->simul_mpp;
1040 }
1041
1042 /*
1043  *      Do pre-proxying for ALL configured sessions
1044  */
1045 int module_pre_proxy(int type, REQUEST *request)
1046 {
1047         return indexed_modcall(request->listener->identity,
1048                                RLM_COMPONENT_PRE_PROXY, type, request);
1049 }
1050
1051 /*
1052  *      Do post-proxying for ALL configured sessions
1053  */
1054 int module_post_proxy(int type, REQUEST *request)
1055 {
1056         return indexed_modcall(request->listener->identity,
1057                                RLM_COMPONENT_POST_PROXY, type, request);
1058 }
1059
1060 /*
1061  *      Do post-authentication for ALL configured sessions
1062  */
1063 int module_post_auth(int postauth_type, REQUEST *request)
1064 {
1065         return indexed_modcall(request->listener->identity,
1066                                RLM_COMPONENT_POST_AUTH, postauth_type, request);
1067 }
1068
1069 /*
1070  *      Do VMPS
1071  */
1072 int module_vmps(REQUEST *request)
1073 {
1074         return indexed_modcall(VMPS_SPACE, RLM_COMPONENT_POST_AUTH, 0,
1075                                request);
1076 }