src/main/realms.c

   1 /*
   2  * realms.c     Realm handling code
   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 2000,2006  The FreeRADIUS server project
  21  * Copyright 2000  Miquel van Smoorenburg <miquels@cistron.nl>
  22  * Copyright 2000  Alan DeKok <aland@ox.org>
  23  */
  24
  25 #include <freeradius-devel/ident.h>
  26 RCSID("$Id$")
  27
  28 #include <freeradius-devel/radiusd.h>
  29 #include <freeradius-devel/rad_assert.h>
  30
  31 #include <sys/stat.h>
  32
  33 #include <ctype.h>
  34 #include <fcntl.h>
  35
  36 static rbtree_t *realms_byname = NULL;
  37
  38 static rbtree_t *home_servers_byaddr = NULL;
  39 static rbtree_t *home_servers_byname = NULL;
  40
  41 static rbtree_t *home_pools_byname = NULL;
  42
  43 static int realm_name_cmp(const void *one, const void *two)
  44 {
  45         const REALM *a = one;
  46         const REALM *b = two;
  47
  48         return strcasecmp(a->name, b->name);
  49 }
  50
  51
  52 static int home_server_name_cmp(const void *one, const void *two)
  53 {
  54         const home_server *a = one;
  55         const home_server *b = two;
  56
  57         return strcasecmp(a->name, b->name);
  58 }
  59
  60 static int home_server_addr_cmp(const void *one, const void *two)
  61 {
  62         const home_server *a = one;
  63         const home_server *b = two;
  64
  65         if (a->port < b->port) return -1;
  66         if (a->port > b->port) return +1;
  67
  68         return lrad_ipaddr_cmp(&a->ipaddr, &b->ipaddr);
  69 }
  70
  71
  72 static int home_pool_name_cmp(const void *one, const void *two)
  73 {
  74         const home_pool_t *a = one;
  75         const home_pool_t *b = two;
  76
  77         return strcasecmp(a->name, b->name);
  78 }
  79
  80
  81 void realms_free(void)
  82 {
  83         rbtree_free(home_servers_byname);
  84         home_servers_byname = NULL;
  85
  86         rbtree_free(home_servers_byaddr);
  87         home_servers_byaddr = NULL;
  88
  89         rbtree_free(home_pools_byname);
  90         home_pools_byname = NULL;
  91
  92         rbtree_free(realms_byname);
  93         realms_byname = NULL;
  94 }
  95
  96
  97 int realms_init(const char *filename)
  98 {
  99         CONF_SECTION *cs;
 100
 101         if (realms_byname) return 1;
 102
 103         realms_byname = rbtree_create(realm_name_cmp, free, 0);
 104         if (!realms_byname) {
 105                 realms_free();
 106                 return 0;
 107         }
 108
 109         home_servers_byaddr = rbtree_create(home_server_addr_cmp, free, 0);
 110         if (!home_servers_byaddr) {
 111                 realms_free();
 112                 return 0;
 113         }
 114
 115         home_servers_byname = rbtree_create(home_server_name_cmp, NULL, 0);
 116         if (!home_servers_byname) {
 117                 realms_free();
 118                 return 0;
 119         }
 120
 121         home_pools_byname = rbtree_create(home_pool_name_cmp, free, 0);
 122         if (!home_pools_byname) {
 123                 realms_free();
 124                 return 0;
 125         }
 126
 127         for (cs = cf_subsection_find_next(mainconfig.config, NULL, "realm");
 128              cs != NULL;
 129              cs = cf_subsection_find_next(mainconfig.config, cs, "realm")) {
 130                 if (!realm_add(filename, cs)) {
 131                         realms_free();
 132                         return 0;
 133                 }
 134         }
 135
 136         return 1;
 137 }
 138
 139 static struct in_addr hs_ip4addr;
 140 static struct in6_addr hs_ip6addr;
 141 static char *hs_type = NULL;
 142 static char *hs_check = NULL;
 143
 144 static CONF_PARSER home_server_config[] = {
 145         { "ipaddr",  PW_TYPE_IPADDR,
 146           0, &hs_ip4addr,  NULL },
 147         { "ipv6addr",  PW_TYPE_IPV6ADDR,
 148           0, &hs_ip6addr, NULL },
 149
 150         { "hostname",  PW_TYPE_STRING_PTR,
 151           offsetof(home_server,hostname), NULL,  NULL},
 152         { "port", PW_TYPE_INTEGER,
 153           offsetof(home_server,port), NULL,   "0" },
 154
 155         { "type",  PW_TYPE_STRING_PTR,
 156           0, &hs_type, NULL },
 157
 158         { "secret",  PW_TYPE_STRING_PTR,
 159           offsetof(home_server,secret), NULL,  NULL},
 160
 161         { "response_window", PW_TYPE_INTEGER,
 162           offsetof(home_server,response_window), NULL,   "30" },
 163         { "max_outstanding", PW_TYPE_INTEGER,
 164           offsetof(home_server,max_outstanding), NULL,   "65536" },
 165
 166         { "zombie_period", PW_TYPE_INTEGER,
 167           offsetof(home_server,zombie_period), NULL,   "40" },
 168         { "status_check", PW_TYPE_STRING_PTR,
 169           0, &hs_check,   "none" },
 170
 171         { "check_interval", PW_TYPE_INTEGER,
 172           offsetof(home_server,ping_interval), NULL,   "30" },
 173         { "num_answers_to_alive", PW_TYPE_INTEGER,
 174           offsetof(home_server,num_pings_to_alive), NULL,   "3" },
 175         { "revive_interval", PW_TYPE_INTEGER,
 176           offsetof(home_server,revive_interval), NULL,   "300" },
 177
 178         { "username",  PW_TYPE_STRING_PTR,
 179           offsetof(home_server,ping_user_name), NULL,  NULL},
 180         { "password",  PW_TYPE_STRING_PTR,
 181           offsetof(home_server,ping_user_password), NULL,  NULL},
 182
 183         { NULL, -1, 0, NULL, NULL }             /* end the list */
 184
 185 };
 186
 187
 188 static int home_server_add(const char *filename, CONF_SECTION *cs)
 189 {
 190         const char *name2;
 191         home_server *home;
 192
 193         name2 = cf_section_name1(cs);
 194         if (!name2 || (strcasecmp(name2, "home_server") != 0)) {
 195                 radlog(L_ERR, "%s[%d]: Section is not a home_server.",
 196                        filename, cf_section_lineno(cs));
 197                 return 0;
 198         }
 199
 200         name2 = cf_section_name2(cs);
 201         if (!name2) {
 202                 radlog(L_ERR, "%s[%d]: Home server section is missing a name.",
 203                        filename, cf_section_lineno(cs));
 204                 return 0;
 205         }
 206
 207         home = rad_malloc(sizeof(*home));
 208         memset(home, 0, sizeof(*home));
 209
 210         home->name = name2;
 211
 212         memset(&hs_ip4addr, 0, sizeof(hs_ip4addr));
 213         memset(&hs_ip6addr, 0, sizeof(hs_ip6addr));
 214         cf_section_parse(cs, home, home_server_config);
 215
 216         if (!home->hostname && (htonl(hs_ip4addr.s_addr) == INADDR_NONE) &&
 217             IN6_IS_ADDR_UNSPECIFIED(&hs_ip6addr)) {
 218                 radlog(L_ERR, "%s[%d]: No hostname, IPv4 address, or IPv6 address defined for home server %s.",
 219                        filename, cf_section_lineno(cs), name2);
 220                 free(home);
 221                 free(hs_type);
 222                 hs_type = NULL;
 223                 free(hs_check);
 224                 hs_check = NULL;
 225                 return 0;
 226         }
 227
 228         /*
 229          *      FIXME: Parse home->hostname!
 230          *
 231          *      Right now, only ipaddr && ip6addr are used.
 232          *      The old-style parsing still allows hostnames.
 233          */
 234         if (htonl(hs_ip4addr.s_addr) != INADDR_NONE) {
 235                 home->ipaddr.af = AF_INET;
 236                 home->ipaddr.ipaddr.ip4addr = hs_ip4addr;
 237
 238         } else if (!IN6_IS_ADDR_UNSPECIFIED(&hs_ip6addr)) {
 239                 home->ipaddr.af = AF_INET6;
 240                 home->ipaddr.ipaddr.ip6addr = hs_ip6addr;
 241
 242         } else {
 243                 radlog(L_ERR, "%s[%d]: FIXME: parse hostname for home server %s.",
 244                        filename, cf_section_lineno(cs), name2);
 245                 free(home);
 246                 free(hs_type);
 247                 hs_type = NULL;
 248                 free(hs_check);
 249                 hs_check = NULL;
 250                 return 0;
 251         }
 252
 253         if (!home->port || (home->port > 65535)) {
 254                 radlog(L_ERR, "%s[%d]: No port, or invalid port defined for home server %s.",
 255                        filename, cf_section_lineno(cs), name2);
 256                 free(home);
 257                 free(hs_type);
 258                 hs_type = NULL;
 259                 free(hs_check);
 260                 hs_check = NULL;
 261                 return 0;
 262         }
 263
 264         if (0) {
 265                 radlog(L_ERR, "%s[%d]: Fatal error!  Home server %s is ourselves!",
 266                        filename, cf_section_lineno(cs), name2);
 267                 free(home);
 268                 free(hs_type);
 269                 hs_type = NULL;
 270                 free(hs_check);
 271                 hs_check = NULL;
 272                 return 0;
 273         }
 274
 275         if (strcasecmp(hs_type, "auth") == 0) {
 276                 home->type = HOME_TYPE_AUTH;
 277
 278         } else if (strcasecmp(hs_type, "acct") == 0) {
 279                 home->type = HOME_TYPE_ACCT;
 280
 281         } else {
 282                 radlog(L_ERR, "%s[%d]: Invalid type \"%s\" for home server %s.",
 283                        filename, cf_section_lineno(cs), hs_type, name2);
 284                 free(home);
 285                 free(hs_type);
 286                 hs_type = NULL;
 287                 free(hs_check);
 288                 hs_check = NULL;
 289                 return 0;
 290         }
 291         free(hs_type);
 292         hs_type = NULL;
 293
 294         if (!home->secret) {
 295                 radlog(L_ERR, "%s[%d]: No shared secret defined for home server %s.",
 296                        filename, cf_section_lineno(cs), name2);
 297                 free(home);
 298                 return 0;
 299         }
 300
 301         if (strcasecmp(hs_check, "none") == 0) {
 302                 home->ping_check = HOME_PING_CHECK_NONE;
 303
 304         } else if (strcasecmp(hs_check, "status-server") == 0) {
 305                 home->ping_check = HOME_PING_CHECK_STATUS_SERVER;
 306
 307         } else if (strcasecmp(hs_check, "request") == 0) {
 308                 home->ping_check = HOME_PING_CHECK_REQUEST;
 309
 310         } else {
 311                 radlog(L_ERR, "%s[%d]: Invalid ping_check \"%s\" for home server %s.",
 312                        filename, cf_section_lineno(cs), hs_check, name2);
 313                 free(home);
 314                 free(hs_check);
 315                 hs_check = NULL;
 316                 return 0;
 317         }
 318         free(hs_check);
 319         hs_check = NULL;
 320
 321         if ((home->ping_check != HOME_PING_CHECK_NONE) &&
 322             (home->ping_check != HOME_PING_CHECK_STATUS_SERVER)) {
 323                 if (!home->ping_user_name) {
 324                         radlog(L_INFO, "%s[%d]: You must supply a user name to enable ping checks",
 325                                filename, cf_section_lineno(cs));
 326                         free(home);
 327                         return 0;
 328                 }
 329
 330                 if ((home->type == HOME_TYPE_AUTH) &&
 331                     !home->ping_user_password) {
 332                         radlog(L_INFO, "%s[%d]: You must supply a password to enable ping checks",
 333                                filename, cf_section_lineno(cs));
 334                         free(home);
 335                         return 0;
 336                 }
 337         }
 338
 339         if (rbtree_finddata(home_servers_byaddr, home)) {
 340                 radlog(L_INFO, "%s[%d]: Ignoring duplicate home server %s.",
 341                        filename, cf_section_lineno(cs), name2);
 342                 return 1;
 343         }
 344
 345         if (!rbtree_insert(home_servers_byname, home)) {
 346                 radlog(L_ERR, "%s[%d]: Internal error adding home server %s.",
 347                        filename, cf_section_lineno(cs), name2);
 348                 free(home);
 349                 return 0;
 350         }
 351
 352         if (!rbtree_insert(home_servers_byaddr, home)) {
 353                 rbtree_deletebydata(home_servers_byname, home);
 354                 radlog(L_ERR, "%s[%d]: Internal error adding home server %s.",
 355                        filename, cf_section_lineno(cs), name2);
 356                 free(home);
 357                 return 0;
 358         }
 359
 360         if (home->response_window < 5) home->response_window = 5;
 361         if (home->response_window > 60) home->response_window = 60;
 362
 363         if (home->max_outstanding < 8) home->max_outstanding = 8;
 364         if (home->max_outstanding > 65536*16) home->max_outstanding = 65536*16;
 365
 366         if (home->ping_interval < 6) home->ping_interval = 6;
 367         if (home->ping_interval > 120) home->ping_interval = 120;
 368
 369         if (home->zombie_period < 20) home->zombie_period = 20;
 370         if (home->zombie_period > 120) home->zombie_period = 120;
 371
 372         if (home->zombie_period < home->response_window) {
 373                 home->zombie_period = home->response_window;
 374         }
 375
 376         if (home->num_pings_to_alive < 3) home->num_pings_to_alive = 3;
 377         if (home->num_pings_to_alive > 10) home->num_pings_to_alive = 10;
 378
 379         if (home->revive_interval < 60) home->revive_interval = 60;
 380         if (home->revive_interval > 3600) home->revive_interval = 3600;
 381
 382         return 1;
 383 }
 384
 385
 386 static int server_pool_add(const char *filename, CONF_SECTION *cs)
 387 {
 388         const char *name2;
 389         home_pool_t *pool;
 390         const char *value;
 391         CONF_PAIR *cp;
 392         int num_home_servers;
 393
 394         name2 = cf_section_name1(cs);
 395         if (!name2 || (strcasecmp(name2, "server_pool") != 0)) {
 396                 radlog(L_ERR, "%s[%d]: Section is not a server_pool.",
 397                        filename, cf_section_lineno(cs));
 398                 return 0;
 399         }
 400
 401         name2 = cf_section_name2(cs);
 402         if (!name2) {
 403                 radlog(L_ERR, "%s[%d]: Server pool section is missing a name.",
 404                        filename, cf_section_lineno(cs));
 405                 return 0;
 406         }
 407
 408         num_home_servers = 0;
 409         for (cp = cf_pair_find(cs, "home_server");
 410              cp != NULL;
 411              cp = cf_pair_find_next(cs, cp, "home_server")) {
 412                 num_home_servers++;
 413         }
 414
 415         if (num_home_servers == 0) {
 416                 radlog(L_ERR, "%s[%d]: No home servers defined in pool %s",
 417                        filename, cf_section_lineno(cs), name2);
 418                 return 0;
 419         }
 420
 421         pool = rad_malloc(sizeof(*pool) + num_home_servers * sizeof(pool->servers[0]));
 422         memset(pool, 0, sizeof(*pool) + num_home_servers * sizeof(pool->servers[0]));
 423
 424         pool->type = HOME_POOL_FAIL_OVER;
 425         pool->name = name2;
 426
 427         cp = cf_pair_find(cs, "type");
 428         if (cp) {
 429                 static LRAD_NAME_NUMBER pool_types[] = {
 430                         { "load-balance", HOME_POOL_LOAD_BALANCE },
 431                         { "fail-over", HOME_POOL_FAIL_OVER },
 432                         { "round_robin", HOME_POOL_LOAD_BALANCE },
 433                         { "fail_over", HOME_POOL_FAIL_OVER },
 434                         { "client-balance", HOME_POOL_CLIENT_BALANCE },
 435                         { NULL, 0 }
 436                 };
 437
 438                 value = cf_pair_value(cp);
 439                 if (!value) {
 440                         radlog(L_ERR, "%s[%d]: No value given for type.",
 441                                filename, cf_pair_lineno(cp));
 442                         free(pool);
 443                         return 0;
 444                 }
 445
 446                 pool->type = lrad_str2int(pool_types, value, 0);
 447                 if (!pool->type) {
 448                         radlog(L_ERR, "%s[%d]: Unknown type \"%s\".",
 449                                filename, cf_pair_lineno(cp), value);
 450                         free(pool);
 451                         return 0;
 452                 }
 453
 454                 DEBUG2(" server_pool %s: type = %s", name2, value);
 455         }
 456
 457         for (cp = cf_pair_find(cs, "home_server");
 458              cp != NULL;
 459              cp = cf_pair_find_next(cs, cp, "home_server")) {
 460                 home_server myhome, *home;
 461
 462                 value = cf_pair_value(cp);
 463                 if (!value) {
 464                         radlog(L_ERR, "%s[%d]: No value given for home_server.",
 465                                filename, cf_pair_lineno(cp));
 466                         free(pool);
 467                         return 0;
 468                 }
 469
 470                 myhome.name = value;
 471
 472                 home = rbtree_finddata(home_servers_byname, &myhome);
 473                 if (!home) {
 474                         CONF_SECTION *server_cs;
 475
 476                         server_cs = cf_section_sub_find_name2(NULL,
 477                                                               "home_server",
 478                                                               value);
 479                         if (!server_cs) {
 480                                 radlog(L_ERR, "%s[%d]: Unknown home_server \"%s\".",
 481                                        filename, cf_pair_lineno(cp), value);
 482                                 free(pool);
 483                                 return 0;
 484                         }
 485
 486                         if (!home_server_add(filename, server_cs)) {
 487                                 free(pool);
 488                                 return 0;
 489                         }
 490
 491                         home = rbtree_finddata(home_servers_byname, &myhome);
 492                         if (!home) {
 493                                 rad_assert("Internal sanity check failed");
 494                                 return 0;
 495                         }
 496                 }
 497
 498                 if (!pool->server_type) {
 499                         rad_assert(home->type != 0);
 500                         pool->server_type = home->type;
 501
 502                 } else if (pool->server_type != home->type) {
 503                         radlog(L_ERR, "%s[%d]: Home server \"%s\" is not of the same type as previous servers in server pool %s",
 504                                filename, cf_pair_lineno(cp), value, pool->name);
 505                         free(pool);
 506                         return 0;
 507                 }
 508
 509                 if (0) {
 510                         DEBUG2("Warning: Duplicate home server %s in server pool %s", home->name, pool->name);
 511                         continue;
 512                 }
 513
 514                 DEBUG2(" server_pool %s: home_server = %s", name2, home->name);
 515                 pool->servers[pool->num_home_servers] = home;
 516                 pool->num_home_servers++;
 517
 518         } /* loop over home_server's */
 519
 520         if (!rbtree_insert(home_pools_byname, pool)) {
 521                 rad_assert("Internal sanity check failed");
 522                 return 0;
 523         }
 524
 525         rad_assert(pool->server_type != 0);
 526
 527         return 1;
 528 }
 529
 530
 531 static int old_server_add(const char *filename, int lineno,
 532                           const char *name, const char *secret,
 533                           home_pool_type_t ldflag, home_pool_t **pool_p,
 534                           int type)
 535 {
 536         int i, insert_point, num_home_servers;
 537         home_server myhome, *home;
 538         home_pool_t mypool, *pool;
 539         CONF_SECTION *cs;
 540
 541         /*
 542          *      LOCAL realms get sanity checked, and nothing else happens.
 543          */
 544         if (strcmp(name, "LOCAL") == 0) {
 545                 if (*pool_p) {
 546                         radlog(L_ERR, "%s[%d]: Realm \"%s\" cannot be both LOCAL and remote", filename, lineno, name);
 547                         return 0;
 548                 }
 549                 return 1;
 550         }
 551
 552         mypool.name = name;
 553         pool = rbtree_finddata(home_pools_byname, &mypool);
 554         if (pool) {
 555                 if (pool->type != ldflag) {
 556                         radlog(L_ERR, "%s[%d]: Inconsistent ldflag for server pool \"%s\"", filename, lineno, name);
 557                         return 0;
 558                 }
 559
 560                 if (pool->server_type != type) {
 561                         radlog(L_ERR, "%s[%d]: Inconsistent home server type for server pool \"%s\"", filename, lineno, name);
 562                         return 0;
 563                 }
 564         }
 565
 566         myhome.name = name;
 567         home = rbtree_finddata(home_servers_byname, &myhome);
 568         if (home) {
 569                 if (strcmp(home->secret, secret) != 0) {
 570                         radlog(L_ERR, "%s[%d]: Inconsistent shared secret for home server \"%s\"", filename, lineno, name);
 571                         return 0;
 572                 }
 573
 574                 if (home->type != type) {
 575                         radlog(L_ERR, "%s[%d]: Inconsistent type for home server \"%s\"", filename, lineno, name);
 576                         return 0;
 577                 }
 578
 579                 /*
 580                  *      See if the home server is already listed
 581                  *      in the pool.  If so, do nothing else.
 582                  */
 583                 if (pool) for (i = 0; i < pool->num_home_servers; i++) {
 584                         if (pool->servers[i] == home) {
 585                                 return 1;
 586                         }
 587                 }
 588         }
 589
 590         /*
 591          *      If we do have a pool, check that there is room to
 592          *      insert the home server we've found, or the one that we
 593          *      create here.
 594          *
 595          *      Note that we insert it into the LAST available
 596          *      position, in order to maintain the same order as in
 597          *      the configuration files.
 598          */
 599         insert_point = -1;
 600         if (pool) {
 601                 for (i = pool->num_home_servers - 1; i >= 0; i--) {
 602                         if (pool->servers[i]) break;
 603
 604                         if (!pool->servers[i]) {
 605                                 insert_point = i;
 606                         }
 607                 }
 608
 609                 if (insert_point < 0) {
 610                         radlog(L_ERR, "%s[%d]: No room in pool to add home server \"%s\".  Please update the realm configuration to use the new-style home servers and server pools.", filename, lineno, name);
 611                         return 0;
 612                 }
 613         }
 614
 615         /*
 616          *      No home server, allocate one.
 617          */
 618         if (!home) {
 619                 const char *p;
 620                 char *q;
 621
 622                 home = rad_malloc(sizeof(*home));
 623                 memset(home, 0, sizeof(*home));
 624
 625                 home->name = name;
 626                 home->hostname = name;
 627                 home->type = type;
 628                 home->secret = secret;
 629
 630                 p = strchr(name, ':');
 631                 if (!p) {
 632                         if (type == HOME_TYPE_AUTH) {
 633                                 home->port = PW_AUTH_UDP_PORT;
 634                         } else {
 635                                 home->port = PW_ACCT_UDP_PORT;
 636                         }
 637
 638                         p = name;
 639                         q = NULL;
 640
 641                 } else if (p == name) {
 642                                 radlog(L_ERR, "%s[%d]: Invalid hostname %s.",
 643                                        filename, lineno, name);
 644                                 free(home);
 645                                 return 0;
 646
 647                 } else {
 648                         home->port = atoi(p + 1);
 649                         if ((home->port == 0) || (home->port > 65535)) {
 650                                 radlog(L_ERR, "%s[%d]: Invalid port %s.",
 651                                        filename, lineno, p + 1);
 652                                 free(home);
 653                                 return 0;
 654                         }
 655
 656                         q = rad_malloc((p - name) + 1);
 657                         memcpy(q, name, (p - name));
 658                         q[p - name] = '\0';
 659                         p = q;
 660                 }
 661
 662                 if (ip_hton(p, AF_UNSPEC, &home->ipaddr) < 0) {
 663                         radlog(L_ERR, "%s[%d]: Failed looking up hostname %s.",
 664                                filename, lineno, p);
 665                         free(home);
 666                         free(q);
 667                         return 0;
 668                 }
 669                 free(q);
 670
 671                 /*
 672                  *      Use the old-style configuration.
 673                  */
 674                 home->max_outstanding = 65535*16;
 675                 home->zombie_period = mainconfig.proxy_retry_delay * mainconfig.proxy_retry_count;
 676                 if (home->zombie_period == 0) home->zombie_period =30;
 677                 home->response_window = home->zombie_period - 1;
 678
 679                 home->ping_check = HOME_PING_CHECK_NONE;
 680
 681                 home->revive_interval = mainconfig.proxy_dead_time;
 682
 683                 if (rbtree_finddata(home_servers_byaddr, home)) {
 684                         radlog(L_ERR, "%s[%d]: Home server %s has the same IP address as another home server.",
 685                                filename, lineno, name);
 686                         free(home);
 687                         return 0;
 688                 }
 689
 690                 if (!rbtree_insert(home_servers_byname, home)) {
 691                         radlog(L_ERR, "%s[%d]: Internal error adding home server %s.",
 692                                filename, lineno, name);
 693                         free(home);
 694                         return 0;
 695                 }
 696
 697                 if (!rbtree_insert(home_servers_byaddr, home)) {
 698                         rbtree_deletebydata(home_servers_byname, home);
 699                         radlog(L_ERR, "%s[%d]: Internal error adding home server %s.",
 700                                filename, lineno, name);
 701                         free(home);
 702                         return 0;
 703                 }
 704         }
 705
 706         /*
 707          *      We now have a home server, see if we can insert it
 708          *      into pre-existing pool.
 709          */
 710         if (insert_point >= 0) {
 711                 rad_assert(pool != NULL);
 712                 pool->servers[insert_point] = home;
 713                 return 1;
 714         }
 715
 716         rad_assert(pool == NULL);
 717         rad_assert(home != NULL);
 718
 719         /*
 720          *      Count the old-style realms of this name.
 721          */
 722         num_home_servers = 0;
 723         for (cs = cf_section_sub_find_name2(mainconfig.config, "realm", name);
 724              cs != NULL;
 725              cs = cf_section_sub_find_name2(cs, "realm", name)) {
 726                 num_home_servers++;
 727         }
 728
 729
 730         pool = rad_malloc(sizeof(*pool) + num_home_servers * sizeof(pool->servers[0]));
 731         memset(pool, 0, sizeof(*pool) + num_home_servers * sizeof(pool->servers[0]));
 732
 733         pool->name = name;
 734         pool->type = ldflag;
 735         pool->server_type = type;
 736         pool->num_home_servers = num_home_servers;
 737         pool->servers[0] = home;
 738
 739         if (!rbtree_insert(home_pools_byname, pool)) {
 740                 rad_assert("Internal sanity check failed");
 741                 return 0;
 742         }
 743
 744         *pool_p = pool;
 745
 746         return 1;
 747 }
 748
 749 static int old_realm_config(const char *filename, CONF_SECTION *cs, REALM *r)
 750 {
 751         char *host;
 752         const char *secret;
 753         home_pool_type_t ldflag;
 754
 755         secret = cf_section_value_find(cs, "secret");
 756
 757         host = cf_section_value_find(cs, "ldflag");
 758         if (!host ||
 759             (strcasecmp(host, "fail_over") == 0)) {
 760                 ldflag = HOME_POOL_FAIL_OVER;
 761                 DEBUG2("  realm %s: ldflag = fail_over", r->name);
 762
 763         } else if (strcasecmp(host, "round_robin") == 0) {
 764                 ldflag = HOME_POOL_LOAD_BALANCE;
 765                 DEBUG2("  realm %s: ldflag = round_robin", r->name);
 766
 767         } else {
 768                 radlog(L_ERR, "%s[%d]: Unknown value \"%s\" for ldflag",
 769                        filename, cf_section_lineno(cs), host);
 770                 return 0;
 771         }
 772
 773         /*
 774          *      Allow old-style if it doesn't exist, or if it exists and
 775          *      it's LOCAL.
 776          */
 777         if (((host = cf_section_value_find(cs, "authhost")) != NULL) &&
 778             (strcmp(host, "LOCAL") != 0)) {
 779                 if (!secret) {
 780                         radlog(L_ERR, "%s[%d]: No shared secret supplied for realm: %s",
 781                                filename, cf_section_lineno(cs), r->name);
 782                         return 0;
 783                 }
 784
 785                 DEBUG2("  realm %s: authhost = %s",  r->name, host);
 786
 787                 if (!old_server_add(filename, cf_section_lineno(cs),
 788                                     host, secret, ldflag,
 789                                     &r->auth_pool, HOME_TYPE_AUTH)) {
 790                         return 0;
 791                 }
 792         }
 793
 794         if (((host = cf_section_value_find(cs, "accthost")) != NULL) &&
 795             (strcmp(host, "LOCAL") != 0)) {
 796                 if (!secret) {
 797                         radlog(L_ERR, "%s[%d]: No shared secret supplied for realm: %s",
 798                                filename, cf_section_lineno(cs), r->name);
 799                         return 0;
 800                 }
 801
 802                 DEBUG2("  realm %s: accthost = %s", r->name, host);
 803
 804                 if (!old_server_add(filename, cf_section_lineno(cs),
 805                                     host, secret, ldflag,
 806                                     &r->auth_pool, HOME_TYPE_ACCT)) {
 807                         return 0;
 808                 }
 809         }
 810
 811         if (secret) DEBUG2("  realm %s: secret = %s", r->name, secret);
 812
 813         return 1;
 814
 815 }
 816
 817
 818 static int add_pool_to_realm(const char *filename, int lineno,
 819                              const char *name, home_pool_t **dest,
 820                              int server_type)
 821 {
 822         home_pool_t mypool, *pool;
 823
 824         mypool.name = name;
 825         pool = rbtree_finddata(home_pools_byname, &mypool);
 826         if (!pool) {
 827                 CONF_SECTION *pool_cs;
 828
 829                 pool_cs = cf_section_sub_find_name2(NULL, "server_pool",
 830                                                     name);
 831                 if (!pool_cs) {
 832                         radlog(L_ERR, "%s[%d]: Failed to find server_pool \"%s\"",
 833                                filename, lineno, name);
 834                         return 0;
 835                 }
 836
 837                 if (!server_pool_add(filename, pool_cs)) {
 838                         return 0;
 839                 }
 840
 841                 pool = rbtree_finddata(home_pools_byname, &mypool);
 842                 if (!pool) {
 843                         rad_assert("Internal sanity check failed");
 844                         return 0;
 845                 }
 846         }
 847
 848         if (pool->server_type != server_type) {
 849                 radlog(L_ERR, "%s[%d]: Incompatible server_pool \"%s\" (mixed auth_pool / acct_pool)",
 850                        filename, lineno, name);
 851                 return 0;
 852         }
 853
 854         *dest = pool;
 855
 856         return 1;
 857 }
 858
 859 int realm_add(const char *filename, CONF_SECTION *cs)
 860 {
 861         const char *name2;
 862         char *pool = NULL;
 863         REALM *r;
 864         CONF_PAIR *cp;
 865
 866         name2 = cf_section_name1(cs);
 867         if (!name2 || (strcasecmp(name2, "realm") != 0)) {
 868                 radlog(L_ERR, "%s[%d]: Section is not a realm.",
 869                        filename, cf_section_lineno(cs));
 870                 return 0;
 871         }
 872
 873         name2 = cf_section_name2(cs);
 874         if (!name2) {
 875                 radlog(L_ERR, "%s[%d]: Realm section is missing the realm name.",
 876                        filename, cf_section_lineno(cs));
 877                 return 0;
 878         }
 879
 880         /*
 881          *      The realm MAY already exist if it's an old-style realm.
 882          *      In that case, merge the old-style realm with this one.
 883          */
 884         r = realm_find(name2);
 885         if (r) {
 886                 if (cf_pair_find(cs, "auth_pool") ||
 887                     cf_pair_find(cs, "acct_pool")) {
 888                         radlog(L_ERR, "%s[%d]: Duplicate realm \"%s\"",
 889                                filename, cf_section_lineno(cs), name2);
 890                         return 0;
 891                 }
 892
 893                 if (!old_realm_config(filename, cs, r)) {
 894                         return 0;
 895                 }
 896
 897                 return 1;
 898         }
 899
 900         r = rad_malloc(sizeof(*r));
 901         memset(r, 0, sizeof(*r));
 902
 903         r->name = name2;
 904
 905         /*
 906          *      Prefer new configuration to old one.
 907          */
 908         cp = cf_pair_find(cs, "auth_pool");
 909         if (cp) pool = cf_pair_value(cp);
 910         if (cp && pool) {
 911                 if (!add_pool_to_realm(filename, cf_pair_lineno(cp),
 912                                        pool, &r->auth_pool, HOME_TYPE_AUTH)) {
 913                         free(r);
 914                         return 0;
 915                 }
 916                 DEBUG2(" realm %s: auth_pool = %s", name2, pool);
 917         }
 918
 919         cp = cf_pair_find(cs, "acct_pool");
 920         if (cp) pool = cf_pair_value(cp);
 921         if (cp && pool) {
 922                 if (!add_pool_to_realm(filename, cf_pair_lineno(cp),
 923                                        pool, &r->acct_pool, HOME_TYPE_ACCT)) {
 924                         free(r);
 925                         return 0;
 926                 }
 927                 DEBUG2(" realm %s: acct_pool = %s", name2, pool);
 928         }
 929
 930         r->striprealm = 1;
 931
 932         if ((cf_section_value_find(cs, "nostrip")) != NULL) {
 933                 r->striprealm = 0;
 934                 DEBUG2(" realm %s: nostrip", name2);
 935         }
 936
 937         /*
 938          *      We're a new-style realm.  Complain if we see the old
 939          *      directives.
 940          */
 941         if (r->auth_pool || r->acct_pool) {
 942                 if (((cp = cf_pair_find(cs, "authhost")) != NULL) ||
 943                     ((cp = cf_pair_find(cs, "accthost")) != NULL) ||
 944                     ((cp = cf_pair_find(cs, "secret")) != NULL) ||
 945                     ((cp = cf_pair_find(cs, "ldflag")) != NULL)) {
 946                         DEBUG2("WARNING: Ignoring old-style configuration entry \"%s\" in realm \"%s\"", cf_pair_attr(cp), r->name);
 947                 }
 948
 949
 950                 /*
 951                  *      The realm MAY be an old-style realm, as there
 952                  *      was no auth_pool or acct_pool.  Double-check
 953                  *      it, just to be safe.
 954                  */
 955         } else if (!old_realm_config(filename, cs, r)) {
 956                 free(r);
 957                 return 0;
 958         }
 959
 960         if (!rbtree_insert(realms_byname, r)) {
 961                 rad_assert("Internal sanity check failed");
 962                 free(r);
 963                 return 0;
 964         }
 965
 966         return 1;
 967 }
 968
 969
 970 /*
 971  *      Find a realm in the REALM list.
 972  */
 973 REALM *realm_find(const char *name)
 974 {
 975         REALM myrealm;
 976
 977         if (!name) name = "NULL";
 978
 979         myrealm.name = name;
 980         return rbtree_finddata(realms_byname, &myrealm);
 981 }
 982
 983
 984 home_server *home_server_ldb(const char *realmname,
 985                              home_pool_t *pool, REQUEST *request)
 986 {
 987         int             start;
 988         int             count;
 989
 990         start = 0;
 991
 992         /*
 993          *      Determine how to pick choose the home server.
 994          */
 995         switch (pool->type) {
 996                 uint32_t hash;
 997
 998                 /*
 999                  *      Load balancing.  Pick one at random.
1000                  */
1001         case HOME_POOL_LOAD_BALANCE:
1002                 hash = lrad_rand();
1003                 start = hash % pool->num_home_servers;
1004                 break;
1005
1006                 /*
1007                  *      For load-balancing by client IP address, we
1008                  *      pick a home server by hashing the client IP.
1009                  *
1010                  *      This isn't as even a load distribution as
1011                  *      tracking the State attribute, but it's better
1012                  *      than nothing.
1013                  */
1014         case HOME_POOL_CLIENT_BALANCE:
1015                 switch (request->packet->src_ipaddr.af) {
1016                 case AF_INET:
1017                         hash = lrad_hash(&request->packet->src_ipaddr.ipaddr.ip4addr,
1018                                          sizeof(request->packet->src_ipaddr.ipaddr.ip4addr));
1019                         break;
1020                 case AF_INET6:
1021                         hash = lrad_hash(&request->packet->src_ipaddr.ipaddr.ip6addr,
1022                                          sizeof(request->packet->src_ipaddr.ipaddr.ip6addr));
1023                         break;
1024                 default:
1025                         hash = 0;
1026                         break;
1027                 }
1028                 start = hash % pool->num_home_servers;
1029                 break;
1030
1031         default:
1032                 start = 0;
1033                 break;
1034         }
1035
1036         /*
1037          *      Starting with the home server we chose, loop through
1038          *      all home servers.  If the current one is dead, skip
1039          *      it.  If it is too busy, skip it.
1040          *
1041          *      Otherwise, use it.
1042          */
1043         for (count = 0; count < pool->num_home_servers; count++) {
1044                 home_server *home = pool->servers[(start + count) % pool->num_home_servers];
1045
1046                 if (home->state == HOME_STATE_IS_DEAD) {
1047                         continue;
1048                 }
1049
1050                 /*
1051                  *      This home server is too busy.  Choose another one.
1052                  */
1053                 if (home->currently_outstanding >= home->max_outstanding) {
1054                         continue;
1055                 }
1056
1057                 return home;
1058         } /* loop over the home servers */
1059
1060         /*
1061          *      No live match found, and no fallback to the "DEFAULT"
1062          *      realm.  We fix this by blindly marking all servers as
1063          *      "live".  But only do it for ones that don't support
1064          *      "pings", as they will be marked live when they
1065          *      actually are live.
1066          */
1067         if (!mainconfig.proxy_fallback &&
1068             mainconfig.wake_all_if_all_dead) {
1069                 home_server *lb = NULL;
1070
1071                 for (count = 0; count < pool->num_home_servers; count++) {
1072                         home_server *home = pool->servers[count];
1073
1074                         if ((home->state == HOME_STATE_IS_DEAD) &&
1075                             (home->ping_check == HOME_PING_CHECK_NONE)) {
1076                                 home->state = HOME_STATE_ALIVE;
1077                                 if (!lb) lb = home;
1078                         }
1079                 }
1080
1081                 if (lb) return lb;
1082         }
1083
1084         /*
1085          *      Still nothing.  Look up the DEFAULT realm, but only
1086          *      if we weren't looking up the NULL or DEFAULT realms.
1087          */
1088         if (mainconfig.proxy_fallback &&
1089             realmname &&
1090             (strcmp(realmname, "NULL") != 0) &&
1091             (strcmp(realmname, "DEFAULT") != 0)) {
1092                 REALM *rd = realm_find("DEFAULT");
1093
1094                 if (!rd) return NULL;
1095
1096                 pool = NULL;
1097                 if (request->packet->code == PW_AUTHENTICATION_REQUEST) {
1098                         pool = rd->auth_pool;
1099
1100                 } else if (request->packet->code == PW_ACCOUNTING_REQUEST) {
1101                         pool = rd->acct_pool;
1102                 }
1103                 if (!pool) return NULL;
1104
1105                 DEBUG2("  Realm %s has no live home servers.  Falling back to the DEFAULT realm.", realmname);
1106                 return home_server_ldb(rd->name, pool, request);
1107         }
1108
1109         /*
1110          *      Still haven't found anything.  Oh well.
1111          */
1112         return NULL;
1113 }
1114
1115
1116 home_server *home_server_find(lrad_ipaddr_t *ipaddr, int port)
1117 {
1118         home_server myhome;
1119
1120         myhome.ipaddr = *ipaddr;
1121         myhome.port = port;
1122
1123         return rbtree_finddata(home_servers_byaddr, &myhome);
1124 }