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 #ifdef WITH_DLOPEN
  98 #include <dlfcn.h>
  99
 100 #ifndef RTLD_NOW
 101 #define RTLD_NOW (0)
 102 #endif
 103 #ifndef RTLD_LOCAL
 104 #define RTLD_LOCAL (0)
 105 #endif
 106
 107 lt_dlhandle lt_dlopenext(const char *name)
 108 {
 109         char buffer[256];
 110
 111         strlcpy(buffer, name, sizeof(buffer));
 112
 113         /*
 114          *      FIXME: Make this configurable...
 115          */
 116         strlcat(buffer, ".so", sizeof(buffer));
 117
 118         return dlopen(buffer, RTLD_NOW | RTLD_LOCAL);
 119 }
 120
 121 void *lt_dlsym(lt_dlhandle handle, UNUSED const char *symbol)
 122 {
 123         return dlsym(handle, symbol);
 124 }
 125
 126 int lt_dlclose(lt_dlhandle handle)
 127 {
 128         return dlclose(handle);
 129 }
 130
 131 const char *lt_dlerror(void)
 132 {
 133         return dlerror();
 134 }
 135
 136
 137 #else  /* without dlopen */
 138 typedef struct lt_dlmodule_t {
 139   const char    *name;
 140   void          *ref;
 141 } lt_dlmodule_t;
 142
 143 typedef struct eap_type_t EAP_TYPE;
 144 typedef struct rlm_sql_module_t rlm_sql_module_t;
 145
 146 /*
 147  *      FIXME: Write hackery to auto-generate this data.
 148  *      We only need to do this on systems that don't have dlopen.
 149  */
 150 extern module_t rlm_pap;
 151 extern module_t rlm_chap;
 152 extern module_t rlm_eap;
 153 extern module_t rlm_sql;
 154 /* and so on ... */
 155
 156 extern EAP_TYPE rlm_eap_md5;
 157 extern rlm_sql_module_t rlm_sql_mysql;
 158 /* and so on ... */
 159
 160 static const lt_dlmodule_t lt_dlmodules[] = {
 161         { "rlm_pap", &rlm_pap },
 162         { "rlm_chap", &rlm_chap },
 163         { "rlm_eap", &rlm_eap },
 164         /* and so on ... */
 165
 166         { "rlm_eap_md5", &rlm_eap_md5 },
 167         /* and so on ... */
 168
 169         { "rlm_sql_mysql", &rlm_sql_mysql },
 170         /* and so on ... */
 171
 172         { NULL, NULL }
 173 };
 174
 175 lt_dlhandle lt_dlopenext(const char *name)
 176 {
 177         int i;
 178
 179         for (i = 0; lt_dlmodules[i].name != NULL; i++) {
 180                 if (strcmp(name, lt_dlmodules[i].name) == 0) {
 181                         return lt_dlmodules[i].ref;
 182                 }
 183         }
 184
 185         return NULL;
 186 }
 187
 188 void *lt_dlsym(lt_dlhandle handle, UNUSED const char *symbol)
 189 {
 190         return handle;
 191 }
 192
 193 int lt_dlclose(lt_dlhandle handle)
 194 {
 195         return 0;
 196 }
 197
 198 const char *lt_dlerror(void)
 199 {
 200         return "Unspecified error";
 201 }
 202
 203 #endif  /* WITH_DLOPEN */
 204 #endif /* WITHOUT_LIBLTDL */
 205
 206 static int virtual_server_idx(const char *name)
 207 {
 208         uint32_t hash;
 209
 210         if (!name) return 0;
 211
 212         hash = fr_hash_string(name);
 213
 214         return hash & (VIRTUAL_SERVER_HASH_SIZE - 1);
 215 }
 216
 217 static void virtual_server_free(virtual_server_t *server)
 218 {
 219         if (!server) return;
 220
 221         if (server->components) rbtree_free(server->components);
 222         server->components = NULL;
 223
 224         free(server);
 225 }
 226
 227 void virtual_servers_free(time_t when)
 228 {
 229         int i;
 230         virtual_server_t **last;
 231
 232         for (i = 0; i < VIRTUAL_SERVER_HASH_SIZE; i++) {
 233                 virtual_server_t *server, *next;
 234
 235                 last = &virtual_servers[i];
 236                 for (server = virtual_servers[i];
 237                      server != NULL;
 238                      server = next) {
 239                         next = server->next;
 240
 241                         /*
 242                          *      If we delete it, fix the links so that
 243                          *      we don't orphan anything.  Also,
 244                          *      delete it if it's old, AND a newer one
 245                          *      was defined.
 246                          *
 247                          *      Otherwise, the last pointer gets set to
 248                          *      the one we didn't delete.
 249                          */
 250                         if ((when == 0) ||
 251                             ((server->created < when) && server->can_free)) {
 252                                 *last = server->next;
 253                                 virtual_server_free(server);
 254                         } else {
 255                                 last = &(server->next);
 256                         }
 257                 }
 258         }
 259 }
 260
 261 static void indexed_modcallable_free(void *data)
 262 {
 263         indexed_modcallable *c = data;
 264
 265         modcallable_free(&c->modulelist);
 266         free(c);
 267 }
 268
 269 static int indexed_modcallable_cmp(const void *one, const void *two)
 270 {
 271         const indexed_modcallable *a = one;
 272         const indexed_modcallable *b = two;
 273
 274         if (a->comp < b->comp) return -1;
 275         if (a->comp >  b->comp) return +1;
 276
 277         return a->idx - b->idx;
 278 }
 279
 280
 281 /*
 282  *      Compare two module entries
 283  */
 284 static int module_instance_cmp(const void *one, const void *two)
 285 {
 286         const module_instance_t *a = one;
 287         const module_instance_t *b = two;
 288
 289         return strcmp(a->name, b->name);
 290 }
 291
 292
 293 static void module_instance_free_old(CONF_SECTION *cs, module_instance_t *node,
 294                                      time_t when)
 295 {
 296         fr_module_hup_t *mh, **last;
 297
 298         /*
 299          *      Walk the list, freeing up old instances.
 300          */
 301         last = &(node->mh);
 302         while (*last) {
 303                 mh = *last;
 304
 305                 /*
 306                  *      Free only every 60 seconds.
 307                  */
 308                 if ((when - mh->when) < 60) {
 309                         last = &(mh->next);
 310                         continue;
 311                 }
 312
 313                 cf_section_parse_free(cs, mh->insthandle);
 314
 315                 if (node->entry->module->detach) {
 316                         (node->entry->module->detach)(mh->insthandle);
 317                 } else {
 318                         free(mh->insthandle);
 319                 }
 320
 321                 *last = mh->next;
 322                 free(mh);
 323         }
 324 }
 325
 326
 327 /*
 328  *      Free a module instance.
 329  */
 330 static void module_instance_free(void *data)
 331 {
 332         module_instance_t *this = data;
 333
 334         module_instance_free_old(this->cs, this, time(NULL) + 100);
 335
 336         if (this->entry->module->detach) {
 337                 (this->entry->module->detach)(this->insthandle);
 338         }
 339
 340 #ifdef HAVE_PTHREAD_H
 341         if (this->mutex) {
 342                 /*
 343                  *      FIXME
 344                  *      The mutex MIGHT be locked...
 345                  *      we'll check for that later, I guess.
 346                  */
 347                 pthread_mutex_destroy(this->mutex);
 348                 free(this->mutex);
 349         }
 350 #endif
 351         memset(this, 0, sizeof(*this));
 352         free(this);
 353 }
 354
 355
 356 /*
 357  *      Compare two module entries
 358  */
 359 static int module_entry_cmp(const void *one, const void *two)
 360 {
 361         const module_entry_t *a = one;
 362         const module_entry_t *b = two;
 363
 364         return strcmp(a->name, b->name);
 365 }
 366
 367 /*
 368  *      Free a module entry.
 369  */
 370 static void module_entry_free(void *data)
 371 {
 372         module_entry_t *this = data;
 373
 374         lt_dlclose(this->handle);       /* ignore any errors */
 375         memset(this, 0, sizeof(*this));
 376         free(this);
 377 }
 378
 379
 380 /*
 381  *      Remove the module lists.
 382  */
 383 int detach_modules(void)
 384 {
 385         rbtree_free(instance_tree);
 386         rbtree_free(module_tree);
 387
 388         lt_dlexit();
 389
 390         return 0;
 391 }
 392
 393
 394 /*
 395  *      Find a module on disk or in memory, and link to it.
 396  */
 397 static module_entry_t *linkto_module(const char *module_name,
 398                                      CONF_SECTION *cs)
 399 {
 400         module_entry_t myentry;
 401         module_entry_t *node;
 402         lt_dlhandle handle;
 403         char module_struct[256];
 404         char *p;
 405         const module_t *module;
 406
 407         strlcpy(myentry.name, module_name, sizeof(myentry.name));
 408         node = rbtree_finddata(module_tree, &myentry);
 409         if (node) return node;
 410
 411         /*
 412          *      Keep the handle around so we can dlclose() it.
 413          */
 414         handle = lt_dlopenext(module_name);
 415         if (handle == NULL) {
 416                 cf_log_err(cf_sectiontoitem(cs),
 417                            "Failed to link to module '%s': %s\n",
 418                            module_name, lt_dlerror());
 419                 return NULL;
 420         }
 421
 422         /*
 423          *      Link to the module's rlm_FOO{} module structure.
 424          *
 425          *      The module_name variable has the version number
 426          *      embedded in it, and we don't want that here.
 427          */
 428         strcpy(module_struct, module_name);
 429         p = strrchr(module_struct, '-');
 430         if (p) *p = '\0';
 431
 432         DEBUG3("    (Loaded %s, checking if it's valid)", module_name);
 433
 434         /*
 435          *      libltld MAY core here, if the handle it gives us contains
 436          *      garbage data.
 437          */
 438         module = lt_dlsym(handle, module_struct);
 439         if (!module) {
 440                 cf_log_err(cf_sectiontoitem(cs),
 441                            "Failed linking to %s structure: %s\n",
 442                            module_name, lt_dlerror());
 443                 lt_dlclose(handle);
 444                 return NULL;
 445         }
 446         /*
 447          *      Before doing anything else, check if it's sane.
 448          */
 449         if (module->magic != RLM_MODULE_MAGIC_NUMBER) {
 450                 lt_dlclose(handle);
 451                 cf_log_err(cf_sectiontoitem(cs),
 452                            "Invalid version in module '%s'",
 453                            module_name);
 454                 return NULL;
 455
 456         }
 457
 458         /* make room for the module type */
 459         node = rad_malloc(sizeof(*node));
 460         memset(node, 0, sizeof(*node));
 461         strlcpy(node->name, module_name, sizeof(node->name));
 462         node->module = module;
 463         node->handle = handle;
 464
 465         cf_log_module(cs, "Linked to module %s", module_name);
 466
 467         /*
 468          *      Add the module as "rlm_foo-version" to the configuration
 469          *      section.
 470          */
 471         if (!rbtree_insert(module_tree, node)) {
 472                 radlog(L_ERR, "Failed to cache module %s", module_name);
 473                 lt_dlclose(handle);
 474                 free(node);
 475                 return NULL;
 476         }
 477
 478         return node;
 479 }
 480
 481 /*
 482  *      Find a module instance.
 483  */
 484 module_instance_t *find_module_instance(CONF_SECTION *modules,
 485                                         const char *instname, int do_link)
 486 {
 487         int check_config_safe = FALSE;
 488         CONF_SECTION *cs;
 489         const char *name1;
 490         module_instance_t *node, myNode;
 491         char module_name[256];
 492
 493         if (!modules) return NULL;
 494
 495         /*
 496          *      Module instances are declared in the modules{} block
 497          *      and referenced later by their name, which is the
 498          *      name2 from the config section, or name1 if there was
 499          *      no name2.
 500          */
 501         cs = cf_section_sub_find_name2(modules, NULL, instname);
 502         if (cs == NULL) {
 503                 radlog(L_ERR, "ERROR: Cannot find a configuration entry for module \"%s\".\n", instname);
 504                 return NULL;
 505         }
 506
 507         /*
 508          *      If there's already a module instance, return it.
 509          */
 510         strlcpy(myNode.name, instname, sizeof(myNode.name));
 511         node = rbtree_finddata(instance_tree, &myNode);
 512         if (node) return node;
 513
 514         if (!do_link) return NULL;
 515
 516         name1 = cf_section_name1(cs);
 517
 518         /*
 519          *      Found the configuration entry.
 520          */
 521         node = rad_malloc(sizeof(*node));
 522         memset(node, 0, sizeof(*node));
 523
 524         node->insthandle = NULL;
 525         node->cs = cs;
 526
 527         /*
 528          *      Names in the "modules" section aren't prefixed
 529          *      with "rlm_", so we add it here.
 530          */
 531         snprintf(module_name, sizeof(module_name), "rlm_%s", name1);
 532
 533         node->entry = linkto_module(module_name, cs);
 534         if (!node->entry) {
 535                 free(node);
 536                 /* linkto_module logs any errors */
 537                 return NULL;
 538         }
 539
 540         if (check_config && (node->entry->module->instantiate) &&
 541             (node->entry->module->type & RLM_TYPE_CHECK_CONFIG_SAFE) == 0) {
 542                 const char *value = NULL;
 543                 CONF_PAIR *cp;
 544
 545                 cp = cf_pair_find(cs, "force_check_config");
 546                 if (cp) value = cf_pair_value(cp);
 547
 548                 if (value && (strcmp(value, "yes") == 0)) goto print_inst;
 549
 550                 cf_log_module(cs, "Skipping instantiation of %s", instname);
 551         } else {
 552         print_inst:
 553                 check_config_safe = TRUE;
 554                 cf_log_module(cs, "Instantiating %s", instname);
 555         }
 556
 557         /*
 558          *      Call the module's instantiation routine.
 559          */
 560         if ((node->entry->module->instantiate) &&
 561             (!check_config || check_config_safe) &&
 562             ((node->entry->module->instantiate)(cs, &node->insthandle) < 0)) {
 563                 cf_log_err(cf_sectiontoitem(cs),
 564                            "Instantiation failed for module \"%s\"",
 565                            instname);
 566                 free(node);
 567                 return NULL;
 568         }
 569
 570         /*
 571          *      We're done.  Fill in the rest of the data structure,
 572          *      and link it to the module instance list.
 573          */
 574         strlcpy(node->name, instname, sizeof(node->name));
 575
 576 #ifdef HAVE_PTHREAD_H
 577         /*
 578          *      If we're threaded, check if the module is thread-safe.
 579          *
 580          *      If it isn't, we create a mutex.
 581          */
 582         if ((node->entry->module->type & RLM_TYPE_THREAD_UNSAFE) != 0) {
 583                 node->mutex = (pthread_mutex_t *) rad_malloc(sizeof(pthread_mutex_t));
 584                 /*
 585                  *      Initialize the mutex.
 586                  */
 587                 pthread_mutex_init(node->mutex, NULL);
 588         } else {
 589                 /*
 590                  *      The module is thread-safe.  Don't give it a mutex.
 591                  */
 592                 node->mutex = NULL;
 593         }
 594
 595 #endif
 596         rbtree_insert(instance_tree, node);
 597
 598         return node;
 599 }
 600
 601 static indexed_modcallable *lookup_by_index(rbtree_t *components,
 602                                             int comp, int idx)
 603 {
 604         indexed_modcallable myc;
 605
 606         myc.comp = comp;
 607         myc.idx = idx;
 608
 609         return rbtree_finddata(components, &myc);
 610 }
 611
 612 /*
 613  *      Create a new sublist.
 614  */
 615 static indexed_modcallable *new_sublist(rbtree_t *components, int comp, int idx)
 616 {
 617         indexed_modcallable *c;
 618
 619         c = lookup_by_index(components, comp, idx);
 620
 621         /* It is an error to try to create a sublist that already
 622          * exists. It would almost certainly be caused by accidental
 623          * duplication in the config file.
 624          *
 625          * index 0 is the exception, because it is used when we want
 626          * to collect _all_ listed modules under a single index by
 627          * default, which is currently the case in all components
 628          * except authenticate. */
 629         if (c) {
 630                 if (idx == 0) {
 631                         return c;
 632                 }
 633                 return NULL;
 634         }
 635
 636         c = rad_malloc(sizeof(*c));
 637         c->modulelist = NULL;
 638         c->comp = comp;
 639         c->idx = idx;
 640
 641         if (!rbtree_insert(components, c)) {
 642                 free(c);
 643                 return NULL;
 644         }
 645
 646         return c;
 647 }
 648
 649 int indexed_modcall(int comp, int idx, REQUEST *request)
 650 {
 651         int rcode;
 652         modcallable *list = NULL;
 653         virtual_server_t *server;
 654
 655         /*
 656          *      Hack to find the correct virtual server.
 657          */
 658         rcode = virtual_server_idx(request->server);
 659         for (server = virtual_servers[rcode];
 660              server != NULL;
 661              server = server->next) {
 662                 if (!request->server && !server->name) break;
 663
 664                 if ((request->server && server->name) &&
 665                     (strcmp(request->server, server->name) == 0)) break;
 666         }
 667
 668         if (!server) {
 669                 RDEBUG("No such virtual server %s", request->server);
 670                 return RLM_MODULE_FAIL;
 671         }
 672
 673         if (idx == 0) {
 674                 list = server->mc[comp];
 675                 if (!list) RDEBUG2("  WARNING: Empty section.  Using default return values.");
 676
 677         } else {
 678                 indexed_modcallable *this;
 679
 680                 this = lookup_by_index(server->components, comp, idx);
 681                 if (this) {
 682                         list = this->modulelist;
 683                 } else {
 684                         RDEBUG2("  WARNING: Unknown value specified for %s.  Cannot perform requested action.",
 685                                 section_type_value[comp].typename);
 686                 }
 687         }
 688
 689         request->component = section_type_value[comp].section;
 690
 691         rcode = modcall(comp, list, request);
 692
 693         request->module = "";
 694         request->component = "";
 695         return rcode;
 696 }
 697
 698 /*
 699  *      Load a sub-module list, as found inside an Auth-Type foo {}
 700  *      block
 701  */
 702 static int load_subcomponent_section(modcallable *parent, CONF_SECTION *cs,
 703                                      rbtree_t *components, int attr, int comp)
 704 {
 705         indexed_modcallable *subcomp;
 706         modcallable *ml;
 707         DICT_VALUE *dval;
 708         const char *name2 = cf_section_name2(cs);
 709
 710         rad_assert(comp >= RLM_COMPONENT_AUTH);
 711         rad_assert(comp < RLM_COMPONENT_COUNT);
 712
 713         /*
 714          *      Sanity check.
 715          */
 716         if (!name2) {
 717                 cf_log_err(cf_sectiontoitem(cs),
 718                            "No name specified for %s block",
 719                            section_type_value[comp].typename);
 720                 return 1;
 721         }
 722
 723         /*
 724          *      Compile the group.
 725          */
 726         ml = compile_modgroup(parent, comp, cs);
 727         if (!ml) {
 728                 return 0;
 729         }
 730
 731         /*
 732          *      We must assign a numeric index to this subcomponent.
 733          *      It is generated and placed in the dictionary
 734          *      automatically.  If it isn't found, it's a serious
 735          *      error.
 736          */
 737         dval = dict_valbyname(attr, name2);
 738         if (!dval) {
 739                 cf_log_err(cf_sectiontoitem(cs),
 740                            "%s %s Not previously configured",
 741                            section_type_value[comp].typename, name2);
 742                 modcallable_free(&ml);
 743                 return 0;
 744         }
 745
 746         subcomp = new_sublist(components, comp, dval->value);
 747         if (!subcomp) {
 748                 modcallable_free(&ml);
 749                 return 1;
 750         }
 751
 752         subcomp->modulelist = ml;
 753         return 1;               /* OK */
 754 }
 755
 756 static int define_type(const DICT_ATTR *dattr, const char *name)
 757 {
 758         uint32_t value;
 759         DICT_VALUE *dval;
 760
 761         /*
 762          *      If the value already exists, don't
 763          *      create it again.
 764          */
 765         dval = dict_valbyname(dattr->attr, name);
 766         if (dval) return 1;
 767
 768         /*
 769          *      Create a new unique value with a
 770          *      meaningless number.  You can't look at
 771          *      it from outside of this code, so it
 772          *      doesn't matter.  The only requirement
 773          *      is that it's unique.
 774          */
 775         do {
 776                 value = fr_rand() & 0x00ffffff;
 777         } while (dict_valbyattr(dattr->attr, value));
 778
 779         if (dict_addvalue(name, dattr->name, value) < 0) {
 780                 radlog(L_ERR, "%s", fr_strerror());
 781                 return 0;
 782         }
 783
 784         return 1;
 785 }
 786
 787 static int load_component_section(CONF_SECTION *cs,
 788                                   rbtree_t *components, int comp)
 789 {
 790         modcallable *this;
 791         CONF_ITEM *modref;
 792         int idx;
 793         indexed_modcallable *subcomp;
 794         const char *modname;
 795         const char *visiblename;
 796         const DICT_ATTR *dattr;
 797
 798         /*
 799          *      Find the attribute used to store VALUEs for this section.
 800          */
 801         dattr = dict_attrbyvalue(section_type_value[comp].attr);
 802         if (!dattr) {
 803                 cf_log_err(cf_sectiontoitem(cs),
 804                            "No such attribute %s",
 805                            section_type_value[comp].typename);
 806                 return -1;
 807         }
 808
 809         /*
 810          *      Loop over the entries in the named section, loading
 811          *      the sections this time.
 812          */
 813         for (modref = cf_item_find_next(cs, NULL);
 814              modref != NULL;
 815              modref = cf_item_find_next(cs, modref)) {
 816                 const char *name1;
 817                 CONF_PAIR *cp = NULL;
 818                 CONF_SECTION *scs = NULL;
 819
 820                 if (cf_item_is_section(modref)) {
 821                         scs = cf_itemtosection(modref);
 822
 823                         name1 = cf_section_name1(scs);
 824
 825                         if (strcmp(name1,
 826                                    section_type_value[comp].typename) == 0) {
 827                                 if (!load_subcomponent_section(NULL, scs,
 828                                                                components,
 829                                                                dattr->attr,
 830                                                                comp)) {
 831                                         return -1; /* FIXME: memleak? */
 832                                 }
 833                                 continue;
 834                         }
 835
 836                         cp = NULL;
 837
 838                 } else if (cf_item_is_pair(modref)) {
 839                         cp = cf_itemtopair(modref);
 840
 841                 } else {
 842                         continue; /* ignore it */
 843                 }
 844
 845                 /*
 846                  *      Try to compile one entry.
 847                  */
 848                 this = compile_modsingle(NULL, comp, modref, &modname);
 849                 if (!this) {
 850                         cf_log_err(cf_sectiontoitem(cs),
 851                                    "Errors parsing %s section.\n",
 852                                    cf_section_name1(cs));
 853                         return -1;
 854                 }
 855
 856                 /*
 857                  *      Look for Auth-Type foo {}, which are special
 858                  *      cases of named sections, and allowable ONLY
 859                  *      at the top-level.
 860                  *
 861                  *      i.e. They're not allowed in a "group" or "redundant"
 862                  *      subsection.
 863                  */
 864                 if (comp == RLM_COMPONENT_AUTH) {
 865                         DICT_VALUE *dval;
 866                         const char *modrefname = NULL;
 867                         if (cp) {
 868                                 modrefname = cf_pair_attr(cp);
 869                         } else {
 870                                 modrefname = cf_section_name2(scs);
 871                                 if (!modrefname) {
 872                                         modcallable_free(&this);
 873                                         cf_log_err(cf_sectiontoitem(cs),
 874                                                    "Errors parsing %s sub-section.\n",
 875                                                    cf_section_name1(scs));
 876                                         return -1;
 877                                 }
 878                         }
 879
 880                         dval = dict_valbyname(PW_AUTH_TYPE, modrefname);
 881                         if (!dval) {
 882                                 /*
 883                                  *      It's a section, but nothing we
 884                                  *      recognize.  Die!
 885                                  */
 886                                 modcallable_free(&this);
 887                                 cf_log_err(cf_sectiontoitem(cs),
 888                                            "Unknown Auth-Type \"%s\" in %s sub-section.",
 889                                            modrefname, section_type_value[comp].section);
 890                                 return -1;
 891                         }
 892                         idx = dval->value;
 893                 } else {
 894                         /* See the comment in new_sublist() for explanation
 895                          * of the special index 0 */
 896                         idx = 0;
 897                 }
 898
 899                 subcomp = new_sublist(components, comp, idx);
 900                 if (subcomp == NULL) {
 901                         modcallable_free(&this);
 902                         continue;
 903                 }
 904
 905                 /* If subcomp->modulelist is NULL, add_to_modcallable will
 906                  * create it */
 907                 visiblename = cf_section_name2(cs);
 908                 if (visiblename == NULL)
 909                         visiblename = cf_section_name1(cs);
 910                 add_to_modcallable(&subcomp->modulelist, this,
 911                                    comp, visiblename);
 912         }
 913
 914         return 0;
 915 }
 916
 917 static int load_byserver(CONF_SECTION *cs)
 918 {
 919         int comp, flag;
 920         const char *name = cf_section_name2(cs);
 921         rbtree_t *components;
 922         virtual_server_t *server = NULL;
 923         indexed_modcallable *c;
 924
 925         if (name) {
 926                 cf_log_info(cs, "server %s {", name);
 927         } else {
 928                 cf_log_info(cs, "server {");
 929         }
 930
 931         cf_log_info(cs, " modules {");
 932
 933         components = rbtree_create(indexed_modcallable_cmp,
 934                                    indexed_modcallable_free, 0);
 935         if (!components) {
 936                 radlog(L_ERR, "Failed to initialize components\n");
 937                 goto error;
 938         }
 939
 940         server = rad_malloc(sizeof(*server));
 941         memset(server, 0, sizeof(*server));
 942
 943         server->name = name;
 944         server->created = time(NULL);
 945         server->cs = cs;
 946         server->components = components;
 947
 948         /*
 949          *      Define types first.
 950          */
 951         for (comp = 0; comp < RLM_COMPONENT_COUNT; ++comp) {
 952                 CONF_SECTION *subcs;
 953                 CONF_ITEM *modref;
 954                 DICT_ATTR *dattr;
 955
 956                 subcs = cf_section_sub_find(cs,
 957                                             section_type_value[comp].section);
 958                 if (!subcs) continue;
 959
 960                 if (cf_item_find_next(subcs, NULL) == NULL) continue;
 961
 962                 /*
 963                  *      Find the attribute used to store VALUEs for this section.
 964                  */
 965                 dattr = dict_attrbyvalue(section_type_value[comp].attr);
 966                 if (!dattr) {
 967                         cf_log_err(cf_sectiontoitem(subcs),
 968                                    "No such attribute %s",
 969                                    section_type_value[comp].typename);
 970                 error:
 971                         if (debug_flag == 0) {
 972                                 radlog(L_ERR, "Failed to load virtual server %s",
 973                                        (name != NULL) ? name : "<default>");
 974                         }
 975                         virtual_server_free(server);
 976                         return -1;
 977                 }
 978
 979                 /*
 980                  *      Define dynamic types, so that others can reference
 981                  *      them.
 982                  */
 983                 for (modref = cf_item_find_next(subcs, NULL);
 984                      modref != NULL;
 985                      modref = cf_item_find_next(subcs, modref)) {
 986                         const char *name1;
 987                         CONF_SECTION *subsubcs;
 988
 989                         /*
 990                          *      Create types for simple references
 991                          *      only when parsing the authenticate
 992                          *      section.
 993                          */
 994                         if ((section_type_value[comp].attr == PW_AUTH_TYPE) &&
 995                             cf_item_is_pair(modref)) {
 996                                 CONF_PAIR *cp = cf_itemtopair(modref);
 997                                 if (!define_type(dattr, cf_pair_attr(cp))) {
 998                                         goto error;
 999                                 }
1000
1001                                 continue;
1002                         }
1003
1004                         if (!cf_item_is_section(modref)) continue;
1005
1006                         subsubcs = cf_itemtosection(modref);
1007                         name1 = cf_section_name1(subsubcs);
1008
1009                         if (strcmp(name1, section_type_value[comp].typename) == 0) {
1010                                 if (!define_type(dattr,
1011                                                  cf_section_name2(subsubcs))) {
1012                                         goto error;
1013                                 }
1014                         }
1015                 }
1016         } /* loop over components */
1017
1018         /*
1019          *      Loop over all of the known components, finding their
1020          *      configuration section, and loading it.
1021          */
1022         flag = 0;
1023         for (comp = 0; comp < RLM_COMPONENT_COUNT; ++comp) {
1024                 CONF_SECTION *subcs;
1025
1026                 subcs = cf_section_sub_find(cs,
1027                                             section_type_value[comp].section);
1028                 if (!subcs) continue;
1029
1030                 if (cf_item_find_next(subcs, NULL) == NULL) continue;
1031
1032                 cf_log_module(cs, "Checking %s {...} for more modules to load",
1033                        section_type_value[comp].section);
1034
1035 #ifdef WITH_PROXY
1036                 /*
1037                  *      Skip pre/post-proxy sections if we're not
1038                  *      proxying.
1039                  */
1040                 if (!mainconfig.proxy_requests &&
1041                     ((comp == PW_PRE_PROXY_TYPE) ||
1042                      (comp == PW_PRE_PROXY_TYPE))) {
1043                         continue;
1044                 }
1045 #endif
1046
1047                 if (load_component_section(subcs, components, comp) < 0) {
1048                         goto error;
1049                 }
1050
1051                 /*
1052                  *      Cache a default, if it exists.  Some people
1053                  *      put empty sections for some reason...
1054                  */
1055                 c = lookup_by_index(components, comp, 0);
1056                 if (c) server->mc[comp] = c->modulelist;
1057
1058                 server->subcs[comp] = subcs;
1059
1060                 flag = 1;
1061         } /* loop over components */
1062
1063         /*
1064          *      We haven't loaded any of the normal sections.  Maybe we're
1065          *      supposed to load the vmps section.
1066          *
1067          *      This is a bit of a hack...
1068          */
1069         if (!flag) {
1070                 CONF_SECTION *subcs;
1071
1072                 subcs = cf_section_sub_find(cs, "vmps");
1073                 if (subcs) {
1074                         cf_log_module(cs, "Checking vmps {...} for more modules to load");
1075                         if (load_component_section(subcs, components,
1076                                                    RLM_COMPONENT_POST_AUTH) < 0) {
1077                                 goto error;
1078                         }
1079                         c = lookup_by_index(components,
1080                                             RLM_COMPONENT_POST_AUTH, 0);
1081                         if (c) server->mc[RLM_COMPONENT_POST_AUTH] = c->modulelist;
1082                         flag = 1;
1083                 }
1084
1085 #ifdef WITH_DHCP
1086                 if (!flag) {
1087                         const DICT_ATTR *dattr;
1088
1089                         dattr = dict_attrbyname("DHCP-Message-Type");
1090
1091                         /*
1092                          *      Handle each DHCP Message type separately.
1093                          */
1094                         if (dattr) for (subcs = cf_subsection_find_next(cs, NULL, "dhcp");
1095                                         subcs != NULL;
1096                                         subcs = cf_subsection_find_next(cs, subcs,
1097                                                                         "dhcp")) {
1098                                 const char *name2 = cf_section_name2(subcs);
1099
1100                                 DEBUG2(" Module: Checking dhcp %s {...} for more modules to load", name2);
1101                                 if (!load_subcomponent_section(NULL, subcs,
1102                                                                components,
1103                                                                dattr->attr,
1104                                                                RLM_COMPONENT_POST_AUTH)) {
1105                                         goto error; /* FIXME: memleak? */
1106                                 }
1107                                 c = lookup_by_index(components,
1108                                                     RLM_COMPONENT_POST_AUTH, 0);
1109                                 if (c) server->mc[RLM_COMPONENT_POST_AUTH] = c->modulelist;
1110                                 flag = 1;
1111                         }
1112                 }
1113 #endif
1114         }
1115
1116         cf_log_info(cs, " } # modules");
1117         cf_log_info(cs, "} # server");
1118
1119         if (!flag && name) {
1120                 DEBUG("WARNING: Server %s is empty, and will do nothing!",
1121                       name);
1122         }
1123
1124         if (debug_flag == 0) {
1125                 radlog(L_INFO, "Loaded virtual server %s",
1126                        (name != NULL) ? name : "<default>");
1127         }
1128
1129         /*
1130          *      Now that it is OK, insert it into the list.
1131          *
1132          *      This is thread-safe...
1133          */
1134         comp = virtual_server_idx(name);
1135         server->next = virtual_servers[comp];
1136         virtual_servers[comp] = server;
1137
1138         /*
1139          *      Mark OLDER ones of the same name as being unused.
1140          */
1141         server = server->next;
1142         while (server) {
1143                 if ((!name && !server->name) ||
1144                     (name && server->name &&
1145                      (strcmp(server->name, name) == 0))) {
1146                         server->can_free = TRUE;
1147                         break;
1148                 }
1149                 server = server->next;
1150         }
1151
1152         return 0;
1153 }
1154
1155
1156 /*
1157  *      Load all of the virtual servers.
1158  */
1159 int virtual_servers_load(CONF_SECTION *config)
1160 {
1161         int null_server = FALSE;
1162         CONF_SECTION *cs;
1163         static int first_time = TRUE;
1164
1165         DEBUG2("%s: #### Loading Virtual Servers ####", mainconfig.name);
1166
1167         /*
1168          *      Load all of the virtual servers.
1169          */
1170         for (cs = cf_subsection_find_next(config, NULL, "server");
1171              cs != NULL;
1172              cs = cf_subsection_find_next(config, cs, "server")) {
1173                 if (!cf_section_name2(cs)) null_server = TRUE;
1174
1175                 if (load_byserver(cs) < 0) {
1176                         /*
1177                          *      Once we successfully staryed once,
1178                          *      continue loading the OTHER servers,
1179                          *      even if one fails.
1180                          */
1181                         if (!first_time) continue;
1182                         return -1;
1183                 }
1184         }
1185
1186         /*
1187          *      No empty server defined.  Try to load an old-style
1188          *      one for backwards compatibility.
1189          */
1190         if (!null_server) {
1191                 if (load_byserver(config) < 0) {
1192                         return -1;
1193                 }
1194         }
1195
1196         /*
1197          *      If we succeed the first time around, remember that.
1198          */
1199         first_time = FALSE;
1200
1201         return 0;
1202 }
1203
1204 int module_hup_module(CONF_SECTION *cs, module_instance_t *node, time_t when)
1205 {
1206         void *insthandle = NULL;
1207         fr_module_hup_t *mh;
1208
1209         if (!node ||
1210             !node->entry->module->instantiate ||
1211             ((node->entry->module->type & RLM_TYPE_HUP_SAFE) == 0)) {
1212                 return 1;
1213         }
1214
1215         cf_log_module(cs, "Trying to reload module \"%s\"", node->name);
1216
1217         if ((node->entry->module->instantiate)(cs, &insthandle) < 0) {
1218                 cf_log_err(cf_sectiontoitem(cs),
1219                            "HUP failed for module \"%s\".  Using old configuration.",
1220                            node->name);
1221                 return 0;
1222         }
1223
1224         radlog(L_INFO, " Module: Reloaded module \"%s\"", node->name);
1225
1226         module_instance_free_old(cs, node, when);
1227
1228         /*
1229          *      Save the old instance handle for later deletion.
1230          */
1231         mh = rad_malloc(sizeof(*mh));
1232         mh->mi = node;
1233         mh->when = when;
1234         mh->insthandle = node->insthandle;
1235         mh->next = node->mh;
1236         node->mh = mh;
1237
1238         node->insthandle = insthandle;
1239
1240         /*
1241          *      FIXME: Set a timeout to come back in 60s, so that
1242          *      we can pro-actively clean up the old instances.
1243          */
1244
1245         return 1;
1246 }
1247
1248
1249 int module_hup(CONF_SECTION *modules)
1250 {
1251         time_t when;
1252         CONF_ITEM *ci;
1253         CONF_SECTION *cs;
1254         module_instance_t *node;
1255
1256         if (!modules) return 0;
1257
1258         when = time(NULL);
1259
1260         /*
1261          *      Loop over the modules
1262          */
1263         for (ci=cf_item_find_next(modules, NULL);
1264              ci != NULL;
1265              ci=cf_item_find_next(modules, ci)) {
1266                 const char *instname;
1267                 module_instance_t myNode;
1268
1269                 /*
1270                  *      If it's not a section, ignore it.
1271                  */
1272                 if (!cf_item_is_section(ci)) continue;
1273
1274                 cs = cf_itemtosection(ci);
1275                 instname = cf_section_name2(cs);
1276                 if (!instname) instname = cf_section_name1(cs);
1277
1278                 strlcpy(myNode.name, instname, sizeof(myNode.name));
1279                 node = rbtree_finddata(instance_tree, &myNode);
1280
1281                 module_hup_module(cs, node, when);
1282         }
1283
1284         return 1;
1285 }
1286
1287
1288 /*
1289  *      Parse the module config sections, and load
1290  *      and call each module's init() function.
1291  *
1292  *      Libtool makes your life a LOT easier, especially with libltdl.
1293  *      see: http://www.gnu.org/software/libtool/
1294  */
1295 int setup_modules(int reload, CONF_SECTION *config)
1296 {
1297         CONF_SECTION    *cs, *modules;
1298         rad_listen_t    *listener;
1299
1300         if (reload) return 0;
1301
1302         /*
1303          *      If necessary, initialize libltdl.
1304          */
1305         if (!reload) {
1306                 /*
1307                  *      This line works around a completely
1308                  *
1309                  *              RIDICULOUS INSANE IDIOTIC
1310                  *
1311                  *      bug in libltdl on certain systems.  The "set
1312                  *      preloaded symbols" macro below ends up
1313                  *      referencing this name, but it isn't defined
1314                  *      anywhere in the libltdl source.  As a result,
1315                  *      any program STUPID enough to rely on libltdl
1316                  *      fails to link, because the symbol isn't
1317                  *      defined anywhere.
1318                  *
1319                  *      It's like libtool and libltdl are some kind
1320                  *      of sick joke.
1321                  */
1322 #define lt__PROGRAM__LTX_preloaded_symbols lt_libltdl_LTX_preloaded_symbols
1323
1324                 /*
1325                  *      Set the default list of preloaded symbols.
1326                  *      This is used to initialize libltdl's list of
1327                  *      preloaded modules.
1328                  *
1329                  *      i.e. Static modules.
1330                  */
1331                 LTDL_SET_PRELOADED_SYMBOLS();
1332
1333                 if (lt_dlinit() != 0) {
1334                         radlog(L_ERR, "Failed to initialize libraries: %s\n",
1335                                         lt_dlerror());
1336                         return -1;
1337                 }
1338
1339                 /*
1340                  *      Set the search path to ONLY our library directory.
1341                  *      This prevents the modules from being found from
1342                  *      any location on the disk.
1343                  */
1344                 lt_dlsetsearchpath(radlib_dir);
1345
1346                 /*
1347                  *      Set up the internal module struct.
1348                  */
1349                 module_tree = rbtree_create(module_entry_cmp,
1350                                             module_entry_free, 0);
1351                 if (!module_tree) {
1352                         radlog(L_ERR, "Failed to initialize modules\n");
1353                         return -1;
1354                 }
1355
1356                 instance_tree = rbtree_create(module_instance_cmp,
1357                                               module_instance_free, 0);
1358                 if (!instance_tree) {
1359                         radlog(L_ERR, "Failed to initialize modules\n");
1360                         return -1;
1361                 }
1362         }
1363
1364         memset(virtual_servers, 0, sizeof(virtual_servers));
1365
1366         /*
1367          *      Remember where the modules were stored.
1368          */
1369         modules = cf_section_sub_find(config, "modules");
1370         if (!modules) {
1371                 radlog(L_ERR, "Cannot find a \"modules\" section in the configuration file!");
1372                 return -1;
1373         }
1374
1375         DEBUG2("%s: #### Instantiating modules ####", mainconfig.name);
1376
1377         /*
1378          *  Look for the 'instantiate' section, which tells us
1379          *  the instantiation order of the modules, and also allows
1380          *  us to load modules with no authorize/authenticate/etc.
1381          *  sections.
1382          */
1383         cs = cf_section_sub_find(config, "instantiate");
1384         if (cs != NULL) {
1385                 CONF_ITEM *ci;
1386                 CONF_PAIR *cp;
1387                 module_instance_t *module;
1388                 const char *name;
1389
1390                 cf_log_info(cs, " instantiate {");
1391
1392                 /*
1393                  *  Loop over the items in the 'instantiate' section.
1394                  */
1395                 for (ci=cf_item_find_next(cs, NULL);
1396                      ci != NULL;
1397                      ci=cf_item_find_next(cs, ci)) {
1398
1399                         /*
1400                          *      Skip sections and "other" stuff.
1401                          *      Sections will be handled later, if
1402                          *      they're referenced at all...
1403                          */
1404                         if (!cf_item_is_pair(ci)) {
1405                                 continue;
1406                         }
1407
1408                         cp = cf_itemtopair(ci);
1409                         name = cf_pair_attr(cp);
1410                         module = find_module_instance(modules, name, 1);
1411                         if (!module) {
1412                                 return -1;
1413                         }
1414                 } /* loop over items in the subsection */
1415
1416                 cf_log_info(cs, " }");
1417         } /* if there's an 'instantiate' section. */
1418
1419         /*
1420          *      Loop over the listeners, figuring out which sections
1421          *      to load.
1422          */
1423         for (listener = mainconfig.listen;
1424              listener != NULL;
1425              listener = listener->next) {
1426                 char buffer[256];
1427
1428                 if (listener->type == RAD_LISTEN_PROXY) continue;
1429
1430                 cs = cf_section_sub_find_name2(config,
1431                                                "server", listener->server);
1432                 if (!cs && (listener->server != NULL)) {
1433                         listener->print(listener, buffer, sizeof(buffer));
1434
1435                         radlog(L_ERR, "No server has been defined for %s", buffer);
1436                         return -1;
1437                 }
1438         }
1439
1440         if (virtual_servers_load(config) < 0) return -1;
1441
1442         return 0;
1443 }
1444
1445 /*
1446  *      Call all authorization modules until one returns
1447  *      somethings else than RLM_MODULE_OK
1448  */
1449 int module_authorize(int autz_type, REQUEST *request)
1450 {
1451         return indexed_modcall(RLM_COMPONENT_AUTZ, autz_type, request);
1452 }
1453
1454 /*
1455  *      Authenticate a user/password with various methods.
1456  */
1457 int module_authenticate(int auth_type, REQUEST *request)
1458 {
1459         return indexed_modcall(RLM_COMPONENT_AUTH, auth_type, request);
1460 }
1461
1462 #ifdef WITH_ACCOUNTING
1463 /*
1464  *      Do pre-accounting for ALL configured sessions
1465  */
1466 int module_preacct(REQUEST *request)
1467 {
1468         return indexed_modcall(RLM_COMPONENT_PREACCT, 0, request);
1469 }
1470
1471 /*
1472  *      Do accounting for ALL configured sessions
1473  */
1474 int module_accounting(int acct_type, REQUEST *request)
1475 {
1476         return indexed_modcall(RLM_COMPONENT_ACCT, acct_type, request);
1477 }
1478 #endif
1479
1480 #ifdef WITH_SESSION_MGMT
1481 /*
1482  *      See if a user is already logged in.
1483  *
1484  *      Returns: 0 == OK, 1 == double logins, 2 == multilink attempt
1485  */
1486 int module_checksimul(int sess_type, REQUEST *request, int maxsimul)
1487 {
1488         int rcode;
1489
1490         if(!request->username)
1491                 return 0;
1492
1493         request->simul_count = 0;
1494         request->simul_max = maxsimul;
1495         request->simul_mpp = 1;
1496
1497         rcode = indexed_modcall(RLM_COMPONENT_SESS, sess_type, request);
1498
1499         if (rcode != RLM_MODULE_OK) {
1500                 /* FIXME: Good spot for a *rate-limited* warning to the log */
1501                 return 0;
1502         }
1503
1504         return (request->simul_count < maxsimul) ? 0 : request->simul_mpp;
1505 }
1506 #endif
1507
1508 #ifdef WITH_PROXY
1509 /*
1510  *      Do pre-proxying for ALL configured sessions
1511  */
1512 int module_pre_proxy(int type, REQUEST *request)
1513 {
1514         return indexed_modcall(RLM_COMPONENT_PRE_PROXY, type, request);
1515 }
1516
1517 /*
1518  *      Do post-proxying for ALL configured sessions
1519  */
1520 int module_post_proxy(int type, REQUEST *request)
1521 {
1522         return indexed_modcall(RLM_COMPONENT_POST_PROXY, type, request);
1523 }
1524 #endif
1525
1526 /*
1527  *      Do post-authentication for ALL configured sessions
1528  */
1529 int module_post_auth(int postauth_type, REQUEST *request)
1530 {
1531         return indexed_modcall(RLM_COMPONENT_POST_AUTH, postauth_type, request);
1532 }
1533
1534 #ifdef WITH_COA
1535 int module_recv_coa(int recv_coa_type, REQUEST *request)
1536 {
1537         return indexed_modcall(RLM_COMPONENT_RECV_COA, recv_coa_type, request);
1538 }
1539
1540 int module_send_coa(int send_coa_type, REQUEST *request)
1541 {
1542         return indexed_modcall(RLM_COMPONENT_SEND_COA, send_coa_type, request);
1543 }
1544 #endif