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 extern int check_config;
  34
  35 typedef struct indexed_modcallable {
  36         int             comp;
  37         int             idx;
  38         modcallable     *modulelist;
  39 } indexed_modcallable;
  40
  41 typedef struct virtual_server_t {
  42         const char      *name;
  43         time_t          created;
  44         int             can_free;
  45         CONF_SECTION    *cs;
  46         rbtree_t        *components;
  47         modcallable     *mc[RLM_COMPONENT_COUNT];
  48         CONF_SECTION    *subcs[RLM_COMPONENT_COUNT];
  49         struct virtual_server_t *next;
  50 } virtual_server_t;
  51
  52 /*
  53  *      Keep a hash of virtual servers, so that we can reload them.
  54  */
  55 #define VIRTUAL_SERVER_HASH_SIZE (256)
  56 static virtual_server_t *virtual_servers[VIRTUAL_SERVER_HASH_SIZE];
  57
  58 static rbtree_t *module_tree = NULL;
  59
  60 static rbtree_t *instance_tree = NULL;
  61
  62 struct fr_module_hup_t {
  63         module_instance_t       *mi;
  64         time_t                  when;
  65         void                    *insthandle;
  66         fr_module_hup_t         *next;
  67 };
  68
  69
  70 typedef struct section_type_value_t {
  71         const char      *section;
  72         const char      *typename;
  73         int             attr;
  74 } section_type_value_t;
  75
  76 /*
  77  *      Ordered by component
  78  */
  79 static const section_type_value_t section_type_value[RLM_COMPONENT_COUNT] = {
  80         { "authenticate", "Auth-Type",       PW_AUTH_TYPE },
  81         { "authorize",    "Autz-Type",       PW_AUTZ_TYPE },
  82         { "preacct",      "Pre-Acct-Type",   PW_PRE_ACCT_TYPE },
  83         { "accounting",   "Acct-Type",       PW_ACCT_TYPE },
  84         { "session",      "Session-Type",    PW_SESSION_TYPE },
  85         { "pre-proxy",    "Pre-Proxy-Type",  PW_PRE_PROXY_TYPE },
  86         { "post-proxy",   "Post-Proxy-Type", PW_POST_PROXY_TYPE },
  87         { "post-auth",    "Post-Auth-Type",  PW_POST_AUTH_TYPE }
  88 #ifdef WITH_COA
  89         ,
  90         { "recv-coa",     "Recv-CoA-Type",   PW_RECV_COA_TYPE },
  91         { "send-coa",     "Send-CoA-Type",   PW_SEND_COA_TYPE }
  92 #endif
  93 };
  94
  95
  96 #ifdef WITHOUT_LIBLTDL
  97 typedef struct lt_dlmodule_t {
  98   const char    *name;
  99   void          *ref;
 100 } lt_dlmodule_t;
 101
 102 /*
 103  *      Define modules here.
 104  */
 105 extern module_t rlm_pap;
 106 extern module_t rlm_chap;
 107 extern module_t rlm_eap;
 108
 109 /*
 110  *      EAP structures are defined elsewhere.
 111  */
 112 typedef struct eap_type_t EAP_TYPE;
 113
 114 /*
 115  *      And so on for other EAP types.
 116  */
 117 extern EAP_TYPE rlm_eap_md5;
 118
 119 static const lt_dlmodule_t lt_dlmodules[] = {
 120         { "rlm_pap", &rlm_pap },
 121         { "rlm_chap", &rlm_chap },
 122         { "rlm_eap", &rlm_eap },
 123         { "rlm_eap_md5", &rlm_eap_md5 },
 124
 125         /*
 126          *      Add other modules here.
 127          */
 128
 129         { NULL, NULL }
 130 };
 131
 132
 133 lt_dlhandle lt_dlopenext(const char *name)
 134 {
 135         int i;
 136
 137         for (i = 0; lt_dlmodules[i].name != NULL; i++) {
 138                 if (strcmp(name, lt_dlmodules[i].name) == 0) {
 139                         return lt_dlmodules[i].ref;
 140                 }
 141         }
 142
 143         return NULL;
 144 }
 145
 146 void *lt_dlsym(lt_dlhandle handle, UNUSED const char *symbol)
 147 {
 148         return handle;
 149 }
 150 #endif /* WITHOUT_LIBLTDL */
 151
 152 static int virtual_server_idx(const char *name)
 153 {
 154         uint32_t hash;
 155
 156         if (!name) return 0;
 157
 158         hash = fr_hash_string(name);
 159
 160         return hash & (VIRTUAL_SERVER_HASH_SIZE - 1);
 161 }
 162
 163 static void virtual_server_free(virtual_server_t *server)
 164 {
 165         if (!server) return;
 166
 167         if (server->components) rbtree_free(server->components);
 168         server->components = NULL;
 169
 170         free(server);
 171 }
 172
 173 void virtual_servers_free(time_t when)
 174 {
 175         int i;
 176         virtual_server_t **last;
 177
 178         for (i = 0; i < VIRTUAL_SERVER_HASH_SIZE; i++) {
 179                 virtual_server_t *server, *next;
 180
 181                 last = &virtual_servers[i];
 182                 for (server = virtual_servers[i];
 183                      server != NULL;
 184                      server = next) {
 185                         next = server->next;
 186
 187                         /*
 188                          *      If we delete it, fix the links so that
 189                          *      we don't orphan anything.  Also,
 190                          *      delete it if it's old, AND a newer one
 191                          *      was defined.
 192                          *
 193                          *      Otherwise, the last pointer gets set to
 194                          *      the one we didn't delete.
 195                          */
 196                         if ((when == 0) ||
 197                             ((server->created < when) && server->can_free)) {
 198                                 *last = server->next;
 199                                 virtual_server_free(server);
 200                         } else {
 201                                 last = &(server->next);
 202                         }
 203                 }
 204         }
 205 }
 206
 207 static void indexed_modcallable_free(void *data)
 208 {
 209         indexed_modcallable *c = data;
 210
 211         modcallable_free(&c->modulelist);
 212         free(c);
 213 }
 214
 215 static int indexed_modcallable_cmp(const void *one, const void *two)
 216 {
 217         const indexed_modcallable *a = one;
 218         const indexed_modcallable *b = two;
 219
 220         if (a->comp < b->comp) return -1;
 221         if (a->comp >  b->comp) return +1;
 222
 223         return a->idx - b->idx;
 224 }
 225
 226
 227 /*
 228  *      Compare two module entries
 229  */
 230 static int module_instance_cmp(const void *one, const void *two)
 231 {
 232         const module_instance_t *a = one;
 233         const module_instance_t *b = two;
 234
 235         return strcmp(a->name, b->name);
 236 }
 237
 238
 239 static void module_instance_free_old(CONF_SECTION *cs, module_instance_t *node,
 240                                      time_t when)
 241 {
 242         fr_module_hup_t *mh, **last;
 243
 244         /*
 245          *      Walk the list, freeing up old instances.
 246          */
 247         last = &(node->mh);
 248         while (*last) {
 249                 mh = *last;
 250
 251                 /*
 252                  *      Free only every 60 seconds.
 253                  */
 254                 if ((when - mh->when) < 60) {
 255                         last = &(mh->next);
 256                         continue;
 257                 }
 258
 259                 cf_section_parse_free(cs, mh->insthandle);
 260
 261                 if (node->entry->module->detach) {
 262                         (node->entry->module->detach)(mh->insthandle);
 263                 } else {
 264                         free(mh->insthandle);
 265                 }
 266
 267                 *last = mh->next;
 268                 free(mh);
 269         }
 270 }
 271
 272
 273 /*
 274  *      Free a module instance.
 275  */
 276 static void module_instance_free(void *data)
 277 {
 278         module_instance_t *this = data;
 279
 280         module_instance_free_old(this->cs, this, time(NULL) + 100);
 281
 282         if (this->entry->module->detach) {
 283                 (this->entry->module->detach)(this->insthandle);
 284         }
 285
 286 #ifdef HAVE_PTHREAD_H
 287         if (this->mutex) {
 288                 /*
 289                  *      FIXME
 290                  *      The mutex MIGHT be locked...
 291                  *      we'll check for that later, I guess.
 292                  */
 293                 pthread_mutex_destroy(this->mutex);
 294                 free(this->mutex);
 295         }
 296 #endif
 297         memset(this, 0, sizeof(*this));
 298         free(this);
 299 }
 300
 301
 302 /*
 303  *      Compare two module entries
 304  */
 305 static int module_entry_cmp(const void *one, const void *two)
 306 {
 307         const module_entry_t *a = one;
 308         const module_entry_t *b = two;
 309
 310         return strcmp(a->name, b->name);
 311 }
 312
 313 /*
 314  *      Free a module entry.
 315  */
 316 static void module_entry_free(void *data)
 317 {
 318         module_entry_t *this = data;
 319
 320         lt_dlclose(this->handle);       /* ignore any errors */
 321         memset(this, 0, sizeof(*this));
 322         free(this);
 323 }
 324
 325
 326 /*
 327  *      Remove the module lists.
 328  */
 329 int detach_modules(void)
 330 {
 331         rbtree_free(instance_tree);
 332         rbtree_free(module_tree);
 333
 334         lt_dlexit();
 335
 336         return 0;
 337 }
 338
 339
 340 /*
 341  *      Find a module on disk or in memory, and link to it.
 342  */
 343 static module_entry_t *linkto_module(const char *module_name,
 344                                      CONF_SECTION *cs)
 345 {
 346         module_entry_t myentry;
 347         module_entry_t *node;
 348         lt_dlhandle handle;
 349         char module_struct[256];
 350         char *p;
 351         const module_t *module;
 352
 353         strlcpy(myentry.name, module_name, sizeof(myentry.name));
 354         node = rbtree_finddata(module_tree, &myentry);
 355         if (node) return node;
 356
 357         /*
 358          *      Keep the handle around so we can dlclose() it.
 359          */
 360         handle = lt_dlopenext(module_name);
 361         if (handle == NULL) {
 362                 cf_log_err(cf_sectiontoitem(cs),
 363                            "Failed to link to module '%s': %s\n",
 364                            module_name, lt_dlerror());
 365                 return NULL;
 366         }
 367
 368         /*
 369          *      Link to the module's rlm_FOO{} module structure.
 370          *
 371          *      The module_name variable has the version number
 372          *      embedded in it, and we don't want that here.
 373          */
 374         strcpy(module_struct, module_name);
 375         p = strrchr(module_struct, '-');
 376         if (p) *p = '\0';
 377
 378         DEBUG3("    (Loaded %s, checking if it's valid)", module_name);
 379
 380         /*
 381          *      libltld MAY core here, if the handle it gives us contains
 382          *      garbage data.
 383          */
 384         module = lt_dlsym(handle, module_struct);
 385         if (!module) {
 386                 cf_log_err(cf_sectiontoitem(cs),
 387                            "Failed linking to %s structure: %s\n",
 388                            module_name, lt_dlerror());
 389                 lt_dlclose(handle);
 390                 return NULL;
 391         }
 392         /*
 393          *      Before doing anything else, check if it's sane.
 394          */
 395         if (module->magic != RLM_MODULE_MAGIC_NUMBER) {
 396                 lt_dlclose(handle);
 397                 cf_log_err(cf_sectiontoitem(cs),
 398                            "Invalid version in module '%s'",
 399                            module_name);
 400                 return NULL;
 401
 402         }
 403
 404         /* make room for the module type */
 405         node = rad_malloc(sizeof(*node));
 406         memset(node, 0, sizeof(*node));
 407         strlcpy(node->name, module_name, sizeof(node->name));
 408         node->module = module;
 409         node->handle = handle;
 410
 411         cf_log_module(cs, "Linked to module %s", module_name);
 412
 413         /*
 414          *      Add the module as "rlm_foo-version" to the configuration
 415          *      section.
 416          */
 417         if (!rbtree_insert(module_tree, node)) {
 418                 radlog(L_ERR, "Failed to cache module %s", module_name);
 419                 lt_dlclose(handle);
 420                 free(node);
 421                 return NULL;
 422         }
 423
 424         return node;
 425 }
 426
 427 /*
 428  *      Find a module instance.
 429  */
 430 module_instance_t *find_module_instance(CONF_SECTION *modules,
 431                                         const char *instname, int do_link)
 432 {
 433         int check_config_safe = FALSE;
 434         CONF_SECTION *cs;
 435         const char *name1, *name2;
 436         module_instance_t *node, myNode;
 437         char module_name[256];
 438
 439         if (!modules) return NULL;
 440
 441         /*
 442          *      Module instances are declared in the modules{} block
 443          *      and referenced later by their name, which is the
 444          *      name2 from the config section, or name1 if there was
 445          *      no name2.
 446          */
 447         cs = cf_section_sub_find_name2(modules, NULL, instname);
 448         if (cs == NULL) {
 449                 radlog(L_ERR, "ERROR: Cannot find a configuration entry for module \"%s\".\n", instname);
 450                 return NULL;
 451         }
 452
 453         /*
 454          *      If there's already a module instance, return it.
 455          */
 456         strlcpy(myNode.name, instname, sizeof(myNode.name));
 457         node = rbtree_finddata(instance_tree, &myNode);
 458         if (node) return node;
 459
 460         if (!do_link) return NULL;
 461
 462         name1 = cf_section_name1(cs);
 463
 464         /*
 465          *      Found the configuration entry.
 466          */
 467         node = rad_malloc(sizeof(*node));
 468         memset(node, 0, sizeof(*node));
 469
 470         node->insthandle = NULL;
 471         node->cs = cs;
 472
 473         /*
 474          *      Names in the "modules" section aren't prefixed
 475          *      with "rlm_", so we add it here.
 476          */
 477         snprintf(module_name, sizeof(module_name), "rlm_%s", name1);
 478
 479         node->entry = linkto_module(module_name, cs);
 480         if (!node->entry) {
 481                 free(node);
 482                 /* linkto_module logs any errors */
 483                 return NULL;
 484         }
 485
 486         if (check_config && (node->entry->module->instantiate) &&
 487             (node->entry->module->type & RLM_TYPE_CHECK_CONFIG_SAFE) == 0) {
 488                 const char *value = NULL;
 489                 CONF_PAIR *cp;
 490
 491                 cp = cf_pair_find(cs, "force_check_config");
 492                 if (cp) value = cf_pair_value(cp);
 493
 494                 if (value && (strcmp(value, "yes") == 0)) goto print_inst;
 495
 496                 cf_log_module(cs, "Skipping instantiation of %s", instname);
 497         } else {
 498         print_inst:
 499                 check_config_safe = TRUE;
 500                 cf_log_module(cs, "Instantiating %s", instname);
 501         }
 502
 503         /*
 504          *      Call the module's instantiation routine.
 505          */
 506         if ((node->entry->module->instantiate) &&
 507             (!check_config || check_config_safe) &&
 508             ((node->entry->module->instantiate)(cs, &node->insthandle) < 0)) {
 509                 cf_log_err(cf_sectiontoitem(cs),
 510                            "Instantiation failed for module \"%s\"",
 511                            instname);
 512                 free(node);
 513                 return NULL;
 514         }
 515
 516         /*
 517          *      We're done.  Fill in the rest of the data structure,
 518          *      and link it to the module instance list.
 519          */
 520         strlcpy(node->name, instname, sizeof(node->name));
 521
 522 #ifdef HAVE_PTHREAD_H
 523         /*
 524          *      If we're threaded, check if the module is thread-safe.
 525          *
 526          *      If it isn't, we create a mutex.
 527          */
 528         if ((node->entry->module->type & RLM_TYPE_THREAD_UNSAFE) != 0) {
 529                 node->mutex = (pthread_mutex_t *) rad_malloc(sizeof(pthread_mutex_t));
 530                 /*
 531                  *      Initialize the mutex.
 532                  */
 533                 pthread_mutex_init(node->mutex, NULL);
 534         } else {
 535                 /*
 536                  *      The module is thread-safe.  Don't give it a mutex.
 537                  */
 538                 node->mutex = NULL;
 539         }
 540
 541 #endif
 542         rbtree_insert(instance_tree, node);
 543
 544         return node;
 545 }
 546
 547 static indexed_modcallable *lookup_by_index(rbtree_t *components,
 548                                             int comp, int idx)
 549 {
 550         indexed_modcallable myc;
 551
 552         myc.comp = comp;
 553         myc.idx = idx;
 554
 555         return rbtree_finddata(components, &myc);
 556 }
 557
 558 /*
 559  *      Create a new sublist.
 560  */
 561 static indexed_modcallable *new_sublist(rbtree_t *components, int comp, int idx)
 562 {
 563         indexed_modcallable *c;
 564
 565         c = lookup_by_index(components, comp, idx);
 566
 567         /* It is an error to try to create a sublist that already
 568          * exists. It would almost certainly be caused by accidental
 569          * duplication in the config file.
 570          *
 571          * index 0 is the exception, because it is used when we want
 572          * to collect _all_ listed modules under a single index by
 573          * default, which is currently the case in all components
 574          * except authenticate. */
 575         if (c) {
 576                 if (idx == 0) {
 577                         return c;
 578                 }
 579                 return NULL;
 580         }
 581
 582         c = rad_malloc(sizeof(*c));
 583         c->modulelist = NULL;
 584         c->comp = comp;
 585         c->idx = idx;
 586
 587         if (!rbtree_insert(components, c)) {
 588                 free(c);
 589                 return NULL;
 590         }
 591
 592         return c;
 593 }
 594
 595 int indexed_modcall(int comp, int idx, REQUEST *request)
 596 {
 597         int rcode;
 598         modcallable *list = NULL;
 599         virtual_server_t *server;
 600
 601         /*
 602          *      Hack to find the correct virtual server.
 603          */
 604         rcode = virtual_server_idx(request->server);
 605         for (server = virtual_servers[rcode];
 606              server != NULL;
 607              server = server->next) {
 608                 if (!request->server && !server->name) break;
 609
 610                 if ((request->server && server->name) &&
 611                     (strcmp(request->server, server->name) == 0)) break;
 612         }
 613
 614         if (!server) {
 615                 RDEBUG("No such virtual server %s", request->server);
 616                 return RLM_MODULE_FAIL;
 617         }
 618
 619         if (idx == 0) {
 620                 list = server->mc[comp];
 621
 622         } else {
 623                 indexed_modcallable *this;
 624
 625                 this = lookup_by_index(server->components, comp, idx);
 626                 if (this) {
 627                         list = this->modulelist;
 628                 } else {
 629                         RDEBUG2("  WARNING: Unknown value specified for %s.  Cannot perform requested action.",
 630                                 section_type_value[comp].typename);
 631                 }
 632         }
 633
 634         request->component = section_type_value[comp].section;
 635
 636         rcode = modcall(comp, list, request);
 637
 638         request->module = "";
 639         request->component = "";
 640         return rcode;
 641 }
 642
 643 /*
 644  *      Load a sub-module list, as found inside an Auth-Type foo {}
 645  *      block
 646  */
 647 static int load_subcomponent_section(modcallable *parent, CONF_SECTION *cs,
 648                                      rbtree_t *components, int attr, int comp)
 649 {
 650         indexed_modcallable *subcomp;
 651         modcallable *ml;
 652         DICT_VALUE *dval;
 653         const char *name2 = cf_section_name2(cs);
 654
 655         rad_assert(comp >= RLM_COMPONENT_AUTH);
 656         rad_assert(comp < RLM_COMPONENT_COUNT);
 657
 658         /*
 659          *      Sanity check.
 660          */
 661         if (!name2) {
 662                 cf_log_err(cf_sectiontoitem(cs),
 663                            "No name specified for %s block",
 664                            section_type_value[comp].typename);
 665                 return 1;
 666         }
 667
 668         /*
 669          *      Compile the group.
 670          */
 671         ml = compile_modgroup(parent, comp, cs);
 672         if (!ml) {
 673                 return 0;
 674         }
 675
 676         /*
 677          *      We must assign a numeric index to this subcomponent.
 678          *      It is generated and placed in the dictionary
 679          *      automatically.  If it isn't found, it's a serious
 680          *      error.
 681          */
 682         dval = dict_valbyname(attr, name2);
 683         if (!dval) {
 684                 cf_log_err(cf_sectiontoitem(cs),
 685                            "%s %s Not previously configured",
 686                            section_type_value[comp].typename, name2);
 687                 modcallable_free(&ml);
 688                 return 0;
 689         }
 690
 691         subcomp = new_sublist(components, comp, dval->value);
 692         if (!subcomp) {
 693                 modcallable_free(&ml);
 694                 return 1;
 695         }
 696
 697         subcomp->modulelist = ml;
 698         return 1;               /* OK */
 699 }
 700
 701 static int define_type(const DICT_ATTR *dattr, const char *name)
 702 {
 703         uint32_t value;
 704         DICT_VALUE *dval;
 705
 706         /*
 707          *      If the value already exists, don't
 708          *      create it again.
 709          */
 710         dval = dict_valbyname(dattr->attr, name);
 711         if (dval) return 1;
 712
 713         /*
 714          *      Create a new unique value with a
 715          *      meaningless number.  You can't look at
 716          *      it from outside of this code, so it
 717          *      doesn't matter.  The only requirement
 718          *      is that it's unique.
 719          */
 720         do {
 721                 value = fr_rand() & 0x00ffffff;
 722         } while (dict_valbyattr(dattr->attr, value));
 723
 724         if (dict_addvalue(name, dattr->name, value) < 0) {
 725                 radlog(L_ERR, "%s", fr_strerror());
 726                 return 0;
 727         }
 728
 729         return 1;
 730 }
 731
 732 static int load_component_section(CONF_SECTION *cs,
 733                                   rbtree_t *components, int comp)
 734 {
 735         modcallable *this;
 736         CONF_ITEM *modref;
 737         int idx;
 738         indexed_modcallable *subcomp;
 739         const char *modname;
 740         const char *visiblename;
 741         const DICT_ATTR *dattr;
 742
 743         /*
 744          *      Find the attribute used to store VALUEs for this section.
 745          */
 746         dattr = dict_attrbyvalue(section_type_value[comp].attr);
 747         if (!dattr) {
 748                 cf_log_err(cf_sectiontoitem(cs),
 749                            "No such attribute %s",
 750                            section_type_value[comp].typename);
 751                 return -1;
 752         }
 753
 754         /*
 755          *      Loop over the entries in the named section, loading
 756          *      the sections this time.
 757          */
 758         for (modref = cf_item_find_next(cs, NULL);
 759              modref != NULL;
 760              modref = cf_item_find_next(cs, modref)) {
 761                 const char *name1;
 762                 CONF_PAIR *cp = NULL;
 763                 CONF_SECTION *scs = NULL;
 764
 765                 if (cf_item_is_section(modref)) {
 766                         scs = cf_itemtosection(modref);
 767
 768                         name1 = cf_section_name1(scs);
 769
 770                         if (strcmp(name1,
 771                                    section_type_value[comp].typename) == 0) {
 772                                 if (!load_subcomponent_section(NULL, scs,
 773                                                                components,
 774                                                                dattr->attr,
 775                                                                comp)) {
 776                                         return -1; /* FIXME: memleak? */
 777                                 }
 778                                 continue;
 779                         }
 780
 781                         cp = NULL;
 782
 783                 } else if (cf_item_is_pair(modref)) {
 784                         cp = cf_itemtopair(modref);
 785
 786                 } else {
 787                         continue; /* ignore it */
 788                 }
 789
 790                 /*
 791                  *      Try to compile one entry.
 792                  */
 793                 this = compile_modsingle(NULL, comp, modref, &modname);
 794                 if (!this) {
 795                         cf_log_err(cf_sectiontoitem(cs),
 796                                    "Errors parsing %s section.\n",
 797                                    cf_section_name1(cs));
 798                         return -1;
 799                 }
 800
 801                 /*
 802                  *      Look for Auth-Type foo {}, which are special
 803                  *      cases of named sections, and allowable ONLY
 804                  *      at the top-level.
 805                  *
 806                  *      i.e. They're not allowed in a "group" or "redundant"
 807                  *      subsection.
 808                  */
 809                 if (comp == RLM_COMPONENT_AUTH) {
 810                         DICT_VALUE *dval;
 811                         const char *modrefname = NULL;
 812                         if (cp) {
 813                                 modrefname = cf_pair_attr(cp);
 814                         } else {
 815                                 modrefname = cf_section_name2(scs);
 816                                 if (!modrefname) {
 817                                         modcallable_free(&this);
 818                                         cf_log_err(cf_sectiontoitem(cs),
 819                                                    "Errors parsing %s sub-section.\n",
 820                                                    cf_section_name1(scs));
 821                                         return -1;
 822                                 }
 823                         }
 824
 825                         dval = dict_valbyname(PW_AUTH_TYPE, modrefname);
 826                         if (!dval) {
 827                                 /*
 828                                  *      It's a section, but nothing we
 829                                  *      recognize.  Die!
 830                                  */
 831                                 modcallable_free(&this);
 832                                 cf_log_err(cf_sectiontoitem(cs),
 833                                            "Unknown Auth-Type \"%s\" in %s sub-section.",
 834                                            modrefname, section_type_value[comp].section);
 835                                 return -1;
 836                         }
 837                         idx = dval->value;
 838                 } else {
 839                         /* See the comment in new_sublist() for explanation
 840                          * of the special index 0 */
 841                         idx = 0;
 842                 }
 843
 844                 subcomp = new_sublist(components, comp, idx);
 845                 if (subcomp == NULL) {
 846                         modcallable_free(&this);
 847                         continue;
 848                 }
 849
 850                 /* If subcomp->modulelist is NULL, add_to_modcallable will
 851                  * create it */
 852                 visiblename = cf_section_name2(cs);
 853                 if (visiblename == NULL)
 854                         visiblename = cf_section_name1(cs);
 855                 add_to_modcallable(&subcomp->modulelist, this,
 856                                    comp, visiblename);
 857         }
 858
 859         return 0;
 860 }
 861
 862 static int load_byserver(CONF_SECTION *cs)
 863 {
 864         int comp, flag;
 865         const char *name = cf_section_name2(cs);
 866         rbtree_t *components;
 867         virtual_server_t *server = NULL;
 868
 869         if (name) {
 870                 cf_log_info(cs, "server %s {", name);
 871         } else {
 872                 cf_log_info(cs, "server {");
 873         }
 874
 875         cf_log_info(cs, " modules {");
 876
 877         components = rbtree_create(indexed_modcallable_cmp,
 878                                    indexed_modcallable_free, 0);
 879         if (!components) {
 880                 radlog(L_ERR, "Failed to initialize components\n");
 881                 goto error;
 882         }
 883
 884         server = rad_malloc(sizeof(*server));
 885         memset(server, 0, sizeof(*server));
 886
 887         server->name = name;
 888         server->created = time(NULL);
 889         server->cs = cs;
 890         server->components = components;
 891
 892         /*
 893          *      Define types first.
 894          */
 895         for (comp = 0; comp < RLM_COMPONENT_COUNT; ++comp) {
 896                 CONF_SECTION *subcs;
 897                 CONF_ITEM *modref;
 898                 DICT_ATTR *dattr;
 899
 900                 subcs = cf_section_sub_find(cs,
 901                                             section_type_value[comp].section);
 902                 if (!subcs) continue;
 903
 904                 if (cf_item_find_next(subcs, NULL) == NULL) continue;
 905
 906                 /*
 907                  *      Find the attribute used to store VALUEs for this section.
 908                  */
 909                 dattr = dict_attrbyvalue(section_type_value[comp].attr);
 910                 if (!dattr) {
 911                         cf_log_err(cf_sectiontoitem(subcs),
 912                                    "No such attribute %s",
 913                                    section_type_value[comp].typename);
 914                 error:
 915                         if (debug_flag == 0) {
 916                                 radlog(L_ERR, "Failed to load virtual server %s",
 917                                        (name != NULL) ? name : "<default>");
 918                         }
 919                         virtual_server_free(server);
 920                         return -1;
 921                 }
 922
 923                 /*
 924                  *      Define dynamic types, so that others can reference
 925                  *      them.
 926                  */
 927                 for (modref = cf_item_find_next(subcs, NULL);
 928                      modref != NULL;
 929                      modref = cf_item_find_next(subcs, modref)) {
 930                         const char *name1;
 931                         CONF_SECTION *subsubcs;
 932
 933                         /*
 934                          *      Create types for simple references
 935                          *      only when parsing the authenticate
 936                          *      section.
 937                          */
 938                         if ((section_type_value[comp].attr == PW_AUTH_TYPE) &&
 939                             cf_item_is_pair(modref)) {
 940                                 CONF_PAIR *cp = cf_itemtopair(modref);
 941                                 if (!define_type(dattr, cf_pair_attr(cp))) {
 942                                         goto error;
 943                                 }
 944
 945                                 continue;
 946                         }
 947
 948                         if (!cf_item_is_section(modref)) continue;
 949
 950                         subsubcs = cf_itemtosection(modref);
 951                         name1 = cf_section_name1(subsubcs);
 952
 953                         if (strcmp(name1, section_type_value[comp].typename) == 0) {
 954                                 if (!define_type(dattr,
 955                                                  cf_section_name2(subsubcs))) {
 956                                         goto error;
 957                                 }
 958                         }
 959                 }
 960         } /* loop over components */
 961
 962         /*
 963          *      Loop over all of the known components, finding their
 964          *      configuration section, and loading it.
 965          */
 966         flag = 0;
 967         for (comp = 0; comp < RLM_COMPONENT_COUNT; ++comp) {
 968                 CONF_SECTION *subcs;
 969                 indexed_modcallable *c;
 970
 971                 subcs = cf_section_sub_find(cs,
 972                                             section_type_value[comp].section);
 973                 if (!subcs) continue;
 974
 975                 if (cf_item_find_next(subcs, NULL) == NULL) continue;
 976
 977                 cf_log_module(cs, "Checking %s {...} for more modules to load",
 978                        section_type_value[comp].section);
 979
 980 #ifdef WITH_PROXY
 981                 /*
 982                  *      Skip pre/post-proxy sections if we're not
 983                  *      proxying.
 984                  */
 985                 if (!mainconfig.proxy_requests &&
 986                     ((comp == PW_PRE_PROXY_TYPE) ||
 987                      (comp == PW_PRE_PROXY_TYPE))) {
 988                         continue;
 989                 }
 990 #endif
 991
 992                 if (load_component_section(subcs, components, comp) < 0) {
 993                         goto error;
 994                 }
 995
 996                 /*
 997                  *      Cache a default, if it exists.  Some people
 998                  *      put empty sections for some reason...
 999                  */
1000                 c = lookup_by_index(components, comp, 0);
1001                 if (c) server->mc[comp] = c->modulelist;
1002
1003                 server->subcs[comp] = subcs;
1004
1005                 flag = 1;
1006         } /* loop over components */
1007
1008         /*
1009          *      We haven't loaded any of the normal sections.  Maybe we're
1010          *      supposed to load the vmps section.
1011          *
1012          *      This is a bit of a hack...
1013          */
1014         if (!flag) {
1015                 CONF_SECTION *subcs;
1016
1017                 subcs = cf_section_sub_find(cs, "vmps");
1018                 if (subcs) {
1019                         cf_log_module(cs, "Checking vmps {...} for more modules to load");
1020                         if (load_component_section(subcs, components,
1021                                                    RLM_COMPONENT_POST_AUTH) < 0) {
1022                                 goto error;
1023                         }
1024                         flag = 1;
1025                 }
1026
1027 #ifdef WITH_DHCP
1028                 if (!flag) {
1029                         const DICT_ATTR *dattr;
1030
1031                         dattr = dict_attrbyname("DHCP-Message-Type");
1032                         if (!dattr) {
1033                                 radlog(L_ERR, "No DHCP-Message-Type attribute");
1034                                 goto error;
1035                         }
1036
1037                         /*
1038                          *      Handle each DHCP Message type separately.
1039                          */
1040                         for (subcs = cf_subsection_find_next(cs, NULL,
1041                                                              "dhcp");
1042                              subcs != NULL;
1043                              subcs = cf_subsection_find_next(cs, subcs,
1044                                                              "dhcp")) {
1045                                 const char *name2 = cf_section_name2(subcs);
1046
1047                                 DEBUG2(" Module: Checking dhcp %s {...} for more modules to load", name2);
1048                                 if (!load_subcomponent_section(NULL, subcs,
1049                                                                components,
1050                                                                dattr->attr,
1051                                                                RLM_COMPONENT_POST_AUTH)) {
1052                                         goto error; /* FIXME: memleak? */
1053                                 }
1054                                 flag = 1;
1055                         }
1056                 }
1057 #endif
1058         }
1059
1060         cf_log_info(cs, " } # modules");
1061         cf_log_info(cs, "} # server");
1062
1063         if (!flag && name) {
1064                 DEBUG("WARNING: Server %s is empty, and will do nothing!",
1065                       name);
1066         }
1067
1068         if (debug_flag == 0) {
1069                 radlog(L_INFO, "Loaded virtual server %s",
1070                        (name != NULL) ? name : "<default>");
1071         }
1072
1073         /*
1074          *      Now that it is OK, insert it into the list.
1075          *
1076          *      This is thread-safe...
1077          */
1078         comp = virtual_server_idx(name);
1079         server->next = virtual_servers[comp];
1080         virtual_servers[comp] = server;
1081
1082         /*
1083          *      Mark OLDER ones of the same name as being unused.
1084          */
1085         server = server->next;
1086         while (server) {
1087                 if ((!name && !server->name) ||
1088                     (name && server->name &&
1089                      (strcmp(server->name, name) == 0))) {
1090                         server->can_free = TRUE;
1091                         break;
1092                 }
1093                 server = server->next;
1094         }
1095
1096         return 0;
1097 }
1098
1099
1100 /*
1101  *      Load all of the virtual servers.
1102  */
1103 int virtual_servers_load(CONF_SECTION *config)
1104 {
1105         int null_server = FALSE;
1106         CONF_SECTION *cs;
1107         static int first_time = TRUE;
1108
1109         DEBUG2("%s: #### Loading Virtual Servers ####", mainconfig.name);
1110
1111         /*
1112          *      Load all of the virtual servers.
1113          */
1114         for (cs = cf_subsection_find_next(config, NULL, "server");
1115              cs != NULL;
1116              cs = cf_subsection_find_next(config, cs, "server")) {
1117                 if (!cf_section_name2(cs)) null_server = TRUE;
1118
1119                 if (load_byserver(cs) < 0) {
1120                         /*
1121                          *      Once we successfully staryed once,
1122                          *      continue loading the OTHER servers,
1123                          *      even if one fails.
1124                          */
1125                         if (!first_time) continue;
1126                         return -1;
1127                 }
1128         }
1129
1130         /*
1131          *      No empty server defined.  Try to load an old-style
1132          *      one for backwards compatibility.
1133          */
1134         if (!null_server) {
1135                 if (load_byserver(config) < 0) {
1136                         return -1;
1137                 }
1138         }
1139
1140         /*
1141          *      If we succeed the first time around, remember that.
1142          */
1143         first_time = FALSE;
1144
1145         return 0;
1146 }
1147
1148 int module_hup_module(CONF_SECTION *cs, module_instance_t *node, time_t when)
1149 {
1150         void *insthandle = NULL;
1151         fr_module_hup_t *mh;
1152
1153         if (!node ||
1154             !node->entry->module->instantiate ||
1155             ((node->entry->module->type & RLM_TYPE_HUP_SAFE) == 0)) {
1156                 return 1;
1157         }
1158
1159         cf_log_module(cs, "Trying to reload module \"%s\"", node->name);
1160
1161         if ((node->entry->module->instantiate)(cs, &insthandle) < 0) {
1162                 cf_log_err(cf_sectiontoitem(cs),
1163                            "HUP failed for module \"%s\".  Using old configuration.",
1164                            node->name);
1165                 return 0;
1166         }
1167
1168         radlog(L_INFO, " Module: Reloaded module \"%s\"", node->name);
1169
1170         module_instance_free_old(cs, node, when);
1171
1172         /*
1173          *      Save the old instance handle for later deletion.
1174          */
1175         mh = rad_malloc(sizeof(*mh));
1176         mh->mi = node;
1177         mh->when = when;
1178         mh->insthandle = node->insthandle;
1179         mh->next = node->mh;
1180         node->mh = mh;
1181
1182         node->insthandle = insthandle;
1183
1184         /*
1185          *      FIXME: Set a timeout to come back in 60s, so that
1186          *      we can pro-actively clean up the old instances.
1187          */
1188
1189         return 1;
1190 }
1191
1192
1193 int module_hup(CONF_SECTION *modules)
1194 {
1195         time_t when;
1196         CONF_ITEM *ci;
1197         CONF_SECTION *cs;
1198         module_instance_t *node;
1199
1200         if (!modules) return 0;
1201
1202         when = time(NULL);
1203
1204         /*
1205          *      Loop over the modules
1206          */
1207         for (ci=cf_item_find_next(modules, NULL);
1208              ci != NULL;
1209              ci=cf_item_find_next(modules, ci)) {
1210                 const char *instname;
1211                 module_instance_t myNode;
1212
1213                 /*
1214                  *      If it's not a section, ignore it.
1215                  */
1216                 if (!cf_item_is_section(ci)) continue;
1217
1218                 cs = cf_itemtosection(ci);
1219                 instname = cf_section_name2(cs);
1220                 if (!instname) instname = cf_section_name1(cs);
1221
1222                 strlcpy(myNode.name, instname, sizeof(myNode.name));
1223                 node = rbtree_finddata(instance_tree, &myNode);
1224
1225                 module_hup_module(cs, node, when);
1226         }
1227
1228         return 1;
1229 }
1230
1231
1232 /*
1233  *      Parse the module config sections, and load
1234  *      and call each module's init() function.
1235  *
1236  *      Libtool makes your life a LOT easier, especially with libltdl.
1237  *      see: http://www.gnu.org/software/libtool/
1238  */
1239 int setup_modules(int reload, CONF_SECTION *config)
1240 {
1241         CONF_SECTION    *cs, *modules;
1242         rad_listen_t    *listener;
1243
1244         if (reload) return 0;
1245
1246         /*
1247          *      If necessary, initialize libltdl.
1248          */
1249         if (!reload) {
1250                 /*
1251                  *      Set the default list of preloaded symbols.
1252                  *      This is used to initialize libltdl's list of
1253                  *      preloaded modules.
1254                  *
1255                  *      i.e. Static modules.
1256                  */
1257                 LTDL_SET_PRELOADED_SYMBOLS();
1258
1259                 if (lt_dlinit() != 0) {
1260                         radlog(L_ERR, "Failed to initialize libraries: %s\n",
1261                                         lt_dlerror());
1262                         return -1;
1263                 }
1264
1265                 /*
1266                  *      Set the search path to ONLY our library directory.
1267                  *      This prevents the modules from being found from
1268                  *      any location on the disk.
1269                  */
1270                 lt_dlsetsearchpath(radlib_dir);
1271
1272                 /*
1273                  *      Set up the internal module struct.
1274                  */
1275                 module_tree = rbtree_create(module_entry_cmp,
1276                                             module_entry_free, 0);
1277                 if (!module_tree) {
1278                         radlog(L_ERR, "Failed to initialize modules\n");
1279                         return -1;
1280                 }
1281
1282                 instance_tree = rbtree_create(module_instance_cmp,
1283                                               module_instance_free, 0);
1284                 if (!instance_tree) {
1285                         radlog(L_ERR, "Failed to initialize modules\n");
1286                         return -1;
1287                 }
1288         }
1289
1290         memset(virtual_servers, 0, sizeof(virtual_servers));
1291
1292         /*
1293          *      Remember where the modules were stored.
1294          */
1295         modules = cf_section_sub_find(config, "modules");
1296         if (!modules) {
1297                 radlog(L_ERR, "Cannot find a \"modules\" section in the configuration file!");
1298                 return -1;
1299         }
1300
1301         DEBUG2("%s: #### Instantiating modules ####", mainconfig.name);
1302
1303         /*
1304          *  Look for the 'instantiate' section, which tells us
1305          *  the instantiation order of the modules, and also allows
1306          *  us to load modules with no authorize/authenticate/etc.
1307          *  sections.
1308          */
1309         cs = cf_section_sub_find(config, "instantiate");
1310         if (cs != NULL) {
1311                 CONF_ITEM *ci;
1312                 CONF_PAIR *cp;
1313                 module_instance_t *module;
1314                 const char *name;
1315
1316                 cf_log_info(cs, " instantiate {");
1317
1318                 /*
1319                  *  Loop over the items in the 'instantiate' section.
1320                  */
1321                 for (ci=cf_item_find_next(cs, NULL);
1322                      ci != NULL;
1323                      ci=cf_item_find_next(cs, ci)) {
1324
1325                         /*
1326                          *      Skip sections and "other" stuff.
1327                          *      Sections will be handled later, if
1328                          *      they're referenced at all...
1329                          */
1330                         if (!cf_item_is_pair(ci)) {
1331                                 continue;
1332                         }
1333
1334                         cp = cf_itemtopair(ci);
1335                         name = cf_pair_attr(cp);
1336                         module = find_module_instance(modules, name, 1);
1337                         if (!module) {
1338                                 return -1;
1339                         }
1340                 } /* loop over items in the subsection */
1341
1342                 cf_log_info(cs, " }");
1343         } /* if there's an 'instantiate' section. */
1344
1345         /*
1346          *      Loop over the listeners, figuring out which sections
1347          *      to load.
1348          */
1349         for (listener = mainconfig.listen;
1350              listener != NULL;
1351              listener = listener->next) {
1352                 char buffer[256];
1353
1354                 if (listener->type == RAD_LISTEN_PROXY) continue;
1355
1356                 cs = cf_section_sub_find_name2(config,
1357                                                "server", listener->server);
1358                 if (!cs && (listener->server != NULL)) {
1359                         listener->print(listener, buffer, sizeof(buffer));
1360
1361                         radlog(L_ERR, "No server has been defined for %s", buffer);
1362                         return -1;
1363                 }
1364         }
1365
1366         if (virtual_servers_load(config) < 0) return -1;
1367
1368         return 0;
1369 }
1370
1371 /*
1372  *      Call all authorization modules until one returns
1373  *      somethings else than RLM_MODULE_OK
1374  */
1375 int module_authorize(int autz_type, REQUEST *request)
1376 {
1377         return indexed_modcall(RLM_COMPONENT_AUTZ, autz_type, request);
1378 }
1379
1380 /*
1381  *      Authenticate a user/password with various methods.
1382  */
1383 int module_authenticate(int auth_type, REQUEST *request)
1384 {
1385         return indexed_modcall(RLM_COMPONENT_AUTH, auth_type, request);
1386 }
1387
1388 #ifdef WITH_ACCOUNTING
1389 /*
1390  *      Do pre-accounting for ALL configured sessions
1391  */
1392 int module_preacct(REQUEST *request)
1393 {
1394         return indexed_modcall(RLM_COMPONENT_PREACCT, 0, request);
1395 }
1396
1397 /*
1398  *      Do accounting for ALL configured sessions
1399  */
1400 int module_accounting(int acct_type, REQUEST *request)
1401 {
1402         return indexed_modcall(RLM_COMPONENT_ACCT, acct_type, request);
1403 }
1404 #endif
1405
1406 #ifdef WITH_SESSION_MGMT
1407 /*
1408  *      See if a user is already logged in.
1409  *
1410  *      Returns: 0 == OK, 1 == double logins, 2 == multilink attempt
1411  */
1412 int module_checksimul(int sess_type, REQUEST *request, int maxsimul)
1413 {
1414         int rcode;
1415
1416         if(!request->username)
1417                 return 0;
1418
1419         request->simul_count = 0;
1420         request->simul_max = maxsimul;
1421         request->simul_mpp = 1;
1422
1423         rcode = indexed_modcall(RLM_COMPONENT_SESS, sess_type, request);
1424
1425         if (rcode != RLM_MODULE_OK) {
1426                 /* FIXME: Good spot for a *rate-limited* warning to the log */
1427                 return 0;
1428         }
1429
1430         return (request->simul_count < maxsimul) ? 0 : request->simul_mpp;
1431 }
1432 #endif
1433
1434 #ifdef WITH_PROXY
1435 /*
1436  *      Do pre-proxying for ALL configured sessions
1437  */
1438 int module_pre_proxy(int type, REQUEST *request)
1439 {
1440         return indexed_modcall(RLM_COMPONENT_PRE_PROXY, type, request);
1441 }
1442
1443 /*
1444  *      Do post-proxying for ALL configured sessions
1445  */
1446 int module_post_proxy(int type, REQUEST *request)
1447 {
1448         return indexed_modcall(RLM_COMPONENT_POST_PROXY, type, request);
1449 }
1450 #endif
1451
1452 /*
1453  *      Do post-authentication for ALL configured sessions
1454  */
1455 int module_post_auth(int postauth_type, REQUEST *request)
1456 {
1457         return indexed_modcall(RLM_COMPONENT_POST_AUTH, postauth_type, request);
1458 }
1459
1460 #ifdef WITH_COA
1461 int module_recv_coa(int recv_coa_type, REQUEST *request)
1462 {
1463         return indexed_modcall(RLM_COMPONENT_RECV_COA, recv_coa_type, request);
1464 }
1465
1466 int module_send_coa(int send_coa_type, REQUEST *request)
1467 {
1468         return indexed_modcall(RLM_COMPONENT_SEND_COA, send_coa_type, request);
1469 }
1470 #endif