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 2007  The FreeRADIUS server project
  21  * Copyright 2007  Alan DeKok <aland@deployingradius.com>
  22  */
  23
  24 #include <freeradius-devel/ident.h>
  25 RCSID("$Id$")
  26
  27 #include <freeradius-devel/radiusd.h>
  28 #include <freeradius-devel/rad_assert.h>
  29
  30 #include <sys/stat.h>
  31
  32 #include <ctype.h>
  33 #include <fcntl.h>
  34
  35 #ifdef HAVE_PCREPOSIX_H
  36 #include <pcreposix.h>
  37 #else
  38 #ifdef HAVE_REGEX_H
  39 #include <regex.h>
  40
  41 /*
  42  *  For POSIX Regular expressions.
  43  *  (0) Means no extended regular expressions.
  44  *  REG_EXTENDED means use extended regular expressions.
  45  */
  46 #ifndef REG_EXTENDED
  47 #define REG_EXTENDED (0)
  48 #endif
  49
  50 #ifndef REG_NOSUB
  51 #define REG_NOSUB (0)
  52 #endif
  53
  54 #ifndef REG_ICASE
  55 #define REG_ICASE (0)
  56 #endif
  57 #endif
  58 #endif
  59
  60 static rbtree_t *realms_byname = NULL;
  61
  62 #ifdef HAVE_REGEX_H
  63 typedef struct realm_regex_t {
  64         REALM   *realm;
  65         struct realm_regex_t *next;
  66 } realm_regex_t;
  67
  68 static realm_regex_t *realms_regex = NULL;
  69
  70 #endif /* HAVE_REGEX_H */
  71
  72 typedef struct realm_config_t {
  73         CONF_SECTION    *cs;
  74         int             dead_time;
  75         int             retry_count;
  76         int             retry_delay;
  77         int             fallback;
  78         int             wake_all_if_all_dead;
  79 } realm_config_t;
  80
  81 static realm_config_t *realm_config = NULL;
  82
  83 #ifdef WITH_PROXY
  84 static rbtree_t *home_servers_byaddr = NULL;
  85 static rbtree_t *home_servers_byname = NULL;
  86 #ifdef WITH_STATS
  87 static int home_server_max_number = 0;
  88 static rbtree_t *home_servers_bynumber = NULL;
  89 #endif
  90
  91 static rbtree_t *home_pools_byname = NULL;
  92
  93 /*
  94  *  Map the proxy server configuration parameters to variables.
  95  */
  96 static const CONF_PARSER proxy_config[] = {
  97         { "retry_delay",  PW_TYPE_INTEGER,
  98           offsetof(realm_config_t, retry_delay),
  99           NULL, Stringify(RETRY_DELAY) },
 100
 101         { "retry_count",  PW_TYPE_INTEGER,
 102           offsetof(realm_config_t, retry_count),
 103           NULL, Stringify(RETRY_COUNT) },
 104
 105         { "default_fallback", PW_TYPE_BOOLEAN,
 106           offsetof(realm_config_t, fallback),
 107           NULL, "no" },
 108
 109         { "dead_time",    PW_TYPE_INTEGER,
 110           offsetof(realm_config_t, dead_time),
 111           NULL, Stringify(DEAD_TIME) },
 112
 113         { "wake_all_if_all_dead", PW_TYPE_BOOLEAN,
 114           offsetof(realm_config_t, wake_all_if_all_dead),
 115           NULL, "no" },
 116
 117         { NULL, -1, 0, NULL, NULL }
 118 };
 119 #endif
 120
 121 static int realm_name_cmp(const void *one, const void *two)
 122 {
 123         const REALM *a = one;
 124         const REALM *b = two;
 125
 126         return strcasecmp(a->name, b->name);
 127 }
 128
 129
 130 #ifdef WITH_PROXY
 131 static void home_server_free(void *data)
 132 {
 133         home_server *home = data;
 134
 135 #ifdef WITH_TLS
 136         tls_server_conf_free(home->tls);
 137         home->tls = NULL;
 138 #endif
 139
 140         free(home);
 141 }
 142
 143 static int home_server_name_cmp(const void *one, const void *two)
 144 {
 145         const home_server *a = one;
 146         const home_server *b = two;
 147
 148         if (a->type < b->type) return -1;
 149         if (a->type > b->type) return +1;
 150
 151         return strcasecmp(a->name, b->name);
 152 }
 153
 154 static int home_server_addr_cmp(const void *one, const void *two)
 155 {
 156         int rcode;
 157         const home_server *a = one;
 158         const home_server *b = two;
 159
 160         if (a->server && !b->server) return -1;
 161         if (!a->server && b->server) return +1;
 162         if (a->server && b->server) {
 163                 rcode = a->type - b->type;
 164                 if (rcode != 0) return rcode;
 165                 return strcmp(a->server, b->server);
 166         }
 167
 168         if (a->port < b->port) return -1;
 169         if (a->port > b->port) return +1;
 170
 171 #ifdef WITH_TCP
 172         if (a->proto < b->proto) return -1;
 173         if (a->proto > b->proto) return +1;
 174 #endif
 175
 176         rcode = fr_ipaddr_cmp(&a->src_ipaddr, &b->src_ipaddr);
 177         if (rcode != 0) return rcode;
 178
 179         return fr_ipaddr_cmp(&a->ipaddr, &b->ipaddr);
 180 }
 181
 182 #ifdef WITH_STATS
 183 static int home_server_number_cmp(const void *one, const void *two)
 184 {
 185         const home_server *a = one;
 186         const home_server *b = two;
 187
 188         return (a->number - b->number);
 189 }
 190 #endif
 191
 192 static int home_pool_name_cmp(const void *one, const void *two)
 193 {
 194         const home_pool_t *a = one;
 195         const home_pool_t *b = two;
 196
 197         if (a->server_type < b->server_type) return -1;
 198         if (a->server_type > b->server_type) return +1;
 199
 200         return strcasecmp(a->name, b->name);
 201 }
 202
 203
 204 static size_t xlat_cs(CONF_SECTION *cs, char *fmt, char *out, size_t outlen)
 205
 206 {
 207         const char *value = NULL;
 208
 209         /*
 210          *      Instance name
 211          */
 212         if (strcmp(fmt, "instance") == 0) {
 213                 value = cf_section_name2(cs);
 214                 if (!value) {
 215                         *out = '\0';
 216                         return 0;
 217                 }
 218         } else {
 219                 CONF_PAIR *cp;
 220
 221                 cp = cf_pair_find(cs, fmt);
 222                 if (!cp || !(value = cf_pair_value(cp))) {
 223                         *out = '\0';
 224                         return 0;
 225                 }
 226         }
 227
 228         strlcpy(out, value, outlen);
 229
 230         return strlen(out);
 231 }
 232
 233
 234 /*
 235  *      Xlat for %{home_server:foo}
 236  */
 237 static size_t xlat_home_server(UNUSED void *instance, REQUEST *request,
 238                                char *fmt, char *out, size_t outlen,
 239                                UNUSED RADIUS_ESCAPE_STRING func)
 240 {
 241         if (!fmt || !out || (outlen < 1)) return 0;
 242
 243         if (!request || !request->home_server) {
 244                 *out = '\0';
 245                 return 0;
 246         }
 247
 248         return xlat_cs(request->home_server->cs, fmt, out, outlen);
 249 }
 250
 251
 252 /*
 253  *      Xlat for %{home_server_pool:foo}
 254  */
 255 static size_t xlat_server_pool(UNUSED void *instance, REQUEST *request,
 256                                char *fmt, char *out, size_t outlen,
 257                                UNUSED RADIUS_ESCAPE_STRING func)
 258 {
 259         if (!fmt || !out || (outlen < 1)) return 0;
 260
 261         if (!request || !request->home_pool) {
 262                 *out = '\0';
 263                 return 0;
 264         }
 265
 266         return xlat_cs(request->home_pool->cs, fmt, out, outlen);
 267 }
 268 #endif
 269
 270 void realms_free(void)
 271 {
 272 #ifdef WITH_PROXY
 273 #ifdef WITH_STATS
 274         rbtree_free(home_servers_bynumber);
 275         home_servers_bynumber = NULL;
 276 #endif
 277
 278         rbtree_free(home_servers_byname);
 279         home_servers_byname = NULL;
 280
 281         rbtree_free(home_servers_byaddr);
 282         home_servers_byaddr = NULL;
 283
 284         rbtree_free(home_pools_byname);
 285         home_pools_byname = NULL;
 286 #endif
 287
 288         rbtree_free(realms_byname);
 289         realms_byname = NULL;
 290
 291 #ifdef HAVE_REGEX_H
 292         if (realms_regex) {
 293                 realm_regex_t *this, *next;
 294
 295                 for (this = realms_regex; this != NULL; this = next) {
 296                         next = this->next;
 297                         free(this->realm);
 298                         free(this);
 299                 }
 300                 realms_regex = NULL;
 301         }
 302 #endif
 303
 304         free(realm_config);
 305         realm_config = NULL;
 306 }
 307
 308
 309 #ifdef WITH_PROXY
 310 static CONF_PARSER limit_config[] = {
 311         { "max_connections", PW_TYPE_INTEGER,
 312           offsetof(home_server, max_connections), NULL,   "16" },
 313
 314         { "max_requests", PW_TYPE_INTEGER,
 315           offsetof(home_server,max_requests), NULL,   "0" },
 316
 317         { "lifetime", PW_TYPE_INTEGER,
 318           offsetof(home_server,lifetime), NULL,   "0" },
 319
 320         { "idle_timeout", PW_TYPE_INTEGER,
 321           offsetof(home_server,idle_timeout), NULL,   "0" },
 322
 323         { NULL, -1, 0, NULL, NULL }             /* end the list */
 324 };
 325
 326 static struct in_addr hs_ip4addr;
 327 static struct in6_addr hs_ip6addr;
 328 static char *hs_srcipaddr = NULL;
 329 static char *hs_type = NULL;
 330 static char *hs_check = NULL;
 331 static char *hs_virtual_server = NULL;
 332 #ifdef WITH_TCP
 333 static char *hs_proto = NULL;
 334 #endif
 335
 336 #ifdef WITH_COA
 337 static CONF_PARSER home_server_coa[] = {
 338         { "irt",  PW_TYPE_INTEGER,
 339           offsetof(home_server, coa_irt), 0, Stringify(2) },
 340         { "mrt",  PW_TYPE_INTEGER,
 341           offsetof(home_server, coa_mrt), 0, Stringify(16) },
 342         { "mrc",  PW_TYPE_INTEGER,
 343           offsetof(home_server, coa_mrc), 0, Stringify(5) },
 344         { "mrd",  PW_TYPE_INTEGER,
 345           offsetof(home_server, coa_mrd), 0, Stringify(30) },
 346
 347         { NULL, -1, 0, NULL, NULL }             /* end the list */
 348 };
 349 #endif
 350
 351 static CONF_PARSER home_server_config[] = {
 352         { "ipaddr",  PW_TYPE_IPADDR,
 353           0, &hs_ip4addr,  NULL },
 354         { "ipv6addr",  PW_TYPE_IPV6ADDR,
 355           0, &hs_ip6addr, NULL },
 356         { "virtual_server",  PW_TYPE_STRING_PTR,
 357           0, &hs_virtual_server, NULL },
 358
 359         { "port", PW_TYPE_INTEGER,
 360           offsetof(home_server,port), NULL,   "0" },
 361
 362         { "type",  PW_TYPE_STRING_PTR,
 363           0, &hs_type, NULL },
 364
 365 #ifdef WITH_TCP
 366         { "proto",  PW_TYPE_STRING_PTR,
 367           0, &hs_proto, NULL },
 368 #endif
 369
 370         { "secret",  PW_TYPE_STRING_PTR,
 371           offsetof(home_server,secret), NULL,  NULL},
 372
 373         { "src_ipaddr",  PW_TYPE_STRING_PTR,
 374           0, &hs_srcipaddr,  NULL },
 375
 376         { "response_window", PW_TYPE_INTEGER,
 377           offsetof(home_server,response_window), NULL,   "30" },
 378         { "no_response_fail", PW_TYPE_BOOLEAN,
 379           offsetof(home_server,no_response_fail), NULL,   NULL },
 380         { "max_outstanding", PW_TYPE_INTEGER,
 381           offsetof(home_server,max_outstanding), NULL,   "65536" },
 382         { "require_message_authenticator",  PW_TYPE_BOOLEAN,
 383           offsetof(home_server, message_authenticator), 0, NULL },
 384
 385         { "zombie_period", PW_TYPE_INTEGER,
 386           offsetof(home_server,zombie_period), NULL,   "40" },
 387         { "status_check", PW_TYPE_STRING_PTR,
 388           0, &hs_check,   "none" },
 389         { "ping_check", PW_TYPE_STRING_PTR,
 390           0, &hs_check,   NULL },
 391
 392         { "ping_interval", PW_TYPE_INTEGER,
 393           offsetof(home_server,ping_interval), NULL,   "30" },
 394         { "check_interval", PW_TYPE_INTEGER,
 395           offsetof(home_server,ping_interval), NULL,   "30" },
 396         { "num_answers_to_alive", PW_TYPE_INTEGER,
 397           offsetof(home_server,num_pings_to_alive), NULL,   "3" },
 398         { "num_pings_to_alive", PW_TYPE_INTEGER,
 399           offsetof(home_server,num_pings_to_alive), NULL,   "3" },
 400         { "revive_interval", PW_TYPE_INTEGER,
 401           offsetof(home_server,revive_interval), NULL,   "300" },
 402         { "status_check_timeout", PW_TYPE_INTEGER,
 403           offsetof(home_server,ping_timeout), NULL,   "4" },
 404
 405         { "username",  PW_TYPE_STRING_PTR,
 406           offsetof(home_server,ping_user_name), NULL,  NULL},
 407         { "password",  PW_TYPE_STRING_PTR,
 408           offsetof(home_server,ping_user_password), NULL,  NULL},
 409
 410 #ifdef WITH_STATS
 411         { "historic_average_window", PW_TYPE_INTEGER,
 412           offsetof(home_server,ema.window), NULL,  NULL },
 413 #endif
 414
 415 #ifdef WITH_COA
 416         {  "coa", PW_TYPE_SUBSECTION, 0, NULL, (const void *) home_server_coa },
 417 #endif
 418
 419         { "limit", PW_TYPE_SUBSECTION, 0, NULL, (const void *) limit_config },
 420
 421         { NULL, -1, 0, NULL, NULL }             /* end the list */
 422 };
 423
 424
 425 static void null_free(UNUSED void *data)
 426 {
 427 }
 428
 429 static int home_server_add(realm_config_t *rc, CONF_SECTION *cs)
 430 {
 431         const char *name2;
 432         home_server *home;
 433         int dual = FALSE;
 434         CONF_PAIR *cp;
 435         CONF_SECTION *tls;
 436
 437         free(hs_virtual_server); /* used only for printing during parsing */
 438         hs_virtual_server = NULL;
 439
 440         name2 = cf_section_name2(cs);
 441         if (!name2) {
 442                 cf_log_err(cf_sectiontoitem(cs),
 443                            "Home server section is missing a name.");
 444                 return 0;
 445         }
 446
 447         home = rad_malloc(sizeof(*home));
 448         memset(home, 0, sizeof(*home));
 449
 450         home->name = name2;
 451         home->cs = cs;
 452
 453         /*
 454          *      For zombie period calculations.  We want to count
 455          *      zombies from the time when the server starts, instead
 456          *      of from 1970.
 457          */
 458         home->last_packet = time(NULL);
 459
 460         /*
 461          *      Authentication servers have a default "no_response_fail = 0".
 462          *      Accounting servers have a default "no_response_fail = 1".
 463          *
 464          *      This is because authentication packets are retried, so
 465          *      they can fail over to another home server.  Accounting
 466          *      packets are not retried, so they cannot fail over, and
 467          *      instead should be rejected immediately.
 468          */
 469         home->no_response_fail = 2;
 470
 471         memset(&hs_ip4addr, 0, sizeof(hs_ip4addr));
 472         memset(&hs_ip6addr, 0, sizeof(hs_ip6addr));
 473         if (cf_section_parse(cs, home, home_server_config) < 0) {
 474                 goto error;
 475         }
 476
 477         /*
 478          *      Figure out which one to use.
 479          */
 480         if (cf_pair_find(cs, "ipaddr")) {
 481                 home->ipaddr.af = AF_INET;
 482                 home->ipaddr.ipaddr.ip4addr = hs_ip4addr;
 483
 484         } else if (cf_pair_find(cs, "ipv6addr")) {
 485                 home->ipaddr.af = AF_INET6;
 486                 home->ipaddr.ipaddr.ip6addr = hs_ip6addr;
 487
 488         } else if ((cp = cf_pair_find(cs, "virtual_server")) != NULL) {
 489                 home->ipaddr.af = AF_UNSPEC;
 490                 home->server = cf_pair_value(cp);
 491                 if (!home->server) {
 492                         cf_log_err(cf_sectiontoitem(cs),
 493                                    "Invalid value for virtual_server");
 494                         goto error;
 495                 }
 496
 497                 if (!cf_section_sub_find_name2(rc->cs, "server", home->server)) {
 498
 499                         cf_log_err(cf_sectiontoitem(cs),
 500                                    "No such server %s", home->server);
 501                         goto error;
 502                 }
 503
 504                 /*
 505                  *      When CoA is used, the user has to specify the type
 506                  *      of the home server, even when they point to
 507                  *      virtual servers.
 508                  */
 509                 home->secret = strdup("");
 510                 goto skip_port;
 511
 512         } else {
 513                 cf_log_err(cf_sectiontoitem(cs),
 514                            "No ipaddr, ipv6addr, or virtual_server defined for home server \"%s\".",
 515                            name2);
 516         error:
 517                 free(home);
 518                 free(hs_type);
 519                 hs_type = NULL;
 520                 free(hs_check);
 521                 hs_check = NULL;
 522                 free(hs_srcipaddr);
 523                 hs_srcipaddr = NULL;
 524 #ifdef WITH_TCP
 525                 free(hs_proto);
 526                 hs_proto = NULL;
 527 #endif
 528                 return 0;
 529         }
 530
 531         if (!home->port || (home->port > 65535)) {
 532                 cf_log_err(cf_sectiontoitem(cs),
 533                            "No port, or invalid port defined for home server %s.",
 534                            name2);
 535                 goto error;
 536         }
 537
 538         if (0) {
 539                 cf_log_err(cf_sectiontoitem(cs),
 540                            "Fatal error!  Home server %s is ourselves!",
 541                            name2);
 542                 goto error;
 543         }
 544
 545         if (!home->secret) {
 546                 cf_log_err(cf_sectiontoitem(cs),
 547                            "No shared secret defined for home server %s.",
 548                            name2);
 549                 goto error;
 550         }
 551
 552         /*
 553          *      Use a reasonable default.
 554          */
 555  skip_port:
 556         if (!hs_type) hs_type = strdup("auth+acct");
 557
 558         if (strcasecmp(hs_type, "auth") == 0) {
 559                 home->type = HOME_TYPE_AUTH;
 560                 if (home->no_response_fail == 2) home->no_response_fail = 0;
 561
 562         } else if (strcasecmp(hs_type, "acct") == 0) {
 563                 home->type = HOME_TYPE_ACCT;
 564                 if (home->no_response_fail == 2) home->no_response_fail = 1;
 565
 566         } else if (strcasecmp(hs_type, "auth+acct") == 0) {
 567                 home->type = HOME_TYPE_AUTH;
 568                 dual = TRUE;
 569
 570 #ifdef WITH_COA
 571         } else if (strcasecmp(hs_type, "coa") == 0) {
 572                 home->type = HOME_TYPE_COA;
 573                 dual = FALSE;
 574
 575                 if (home->server != NULL) {
 576                         cf_log_err(cf_sectiontoitem(cs),
 577                                    "Home servers of type \"coa\" cannot point to a virtual server");
 578                         goto error;
 579                 }
 580 #endif
 581
 582         } else {
 583                 cf_log_err(cf_sectiontoitem(cs),
 584                            "Invalid type \"%s\" for home server %s.",
 585                            hs_type, name2);
 586                 goto error;
 587         }
 588         free(hs_type);
 589         hs_type = NULL;
 590
 591         if (!hs_check || (strcasecmp(hs_check, "none") == 0)) {
 592                 home->ping_check = HOME_PING_CHECK_NONE;
 593
 594         } else if (strcasecmp(hs_check, "status-server") == 0) {
 595                 home->ping_check = HOME_PING_CHECK_STATUS_SERVER;
 596
 597         } else if (strcasecmp(hs_check, "request") == 0) {
 598                 home->ping_check = HOME_PING_CHECK_REQUEST;
 599
 600                 if (!home->ping_user_name ||
 601                     !*home->ping_user_name) {
 602                         cf_log_err(cf_sectiontoitem(cs), "You must supply a 'username' to enable status_check=request");
 603                         goto error;
 604                 }
 605
 606                 if ((home->type == HOME_TYPE_AUTH) &&
 607                     (!home->ping_user_password ||
 608                      !*home->ping_user_password)) {
 609                         cf_log_err(cf_sectiontoitem(cs), "You must supply a password to enable status_check=request");
 610                         goto error;
 611                 }
 612
 613         } else {
 614                 cf_log_err(cf_sectiontoitem(cs),
 615                            "Invalid status__check \"%s\" for home server %s.",
 616                            hs_check, name2);
 617                 goto error;
 618         }
 619         free(hs_check);
 620         hs_check = NULL;
 621
 622         if ((home->ping_check != HOME_PING_CHECK_NONE) &&
 623             (home->ping_check != HOME_PING_CHECK_STATUS_SERVER)) {
 624                 if (!home->ping_user_name) {
 625                         cf_log_err(cf_sectiontoitem(cs), "You must supply a user name to enable status_check=request");
 626                         goto error;
 627                 }
 628
 629                 if ((home->type == HOME_TYPE_AUTH) &&
 630                     !home->ping_user_password) {
 631                         cf_log_err(cf_sectiontoitem(cs), "You must supply a password to enable status_check=request");
 632                         goto error;
 633                 }
 634         }
 635
 636         home->proto = IPPROTO_UDP;
 637 #ifdef WITH_TCP
 638         if (hs_proto) {
 639                 if (strcmp(hs_proto, "udp") == 0) {
 640                         free(hs_proto);
 641                         hs_proto = NULL;
 642
 643                 } else if (strcmp(hs_proto, "tcp") == 0) {
 644                         free(hs_proto);
 645                         hs_proto = NULL;
 646                         home->proto = IPPROTO_TCP;
 647
 648                         if (home->ping_check != HOME_PING_CHECK_NONE) {
 649                                 cf_log_err(cf_sectiontoitem(cs),
 650                                            "Only 'status_check = none' is allowed for home servers with 'proto = tcp'");
 651                                 goto error;
 652                         }
 653
 654                 } else {
 655                         cf_log_err(cf_sectiontoitem(cs),
 656                                    "Unknown proto \"%s\".", hs_proto);
 657                         goto error;
 658                 }
 659         }
 660 #endif
 661
 662         if (!home->server &&
 663             rbtree_finddata(home_servers_byaddr, home)) {
 664                 cf_log_err(cf_sectiontoitem(cs), "Duplicate home server");
 665                 goto error;
 666         }
 667
 668         /*
 669          *      Check the TLS configuration.
 670          */
 671         tls = cf_section_sub_find(cs, "tls");
 672
 673         /*
 674          *      If the home is a virtual server, don't look up source IP.
 675          */
 676         if (!home->server) {
 677                 rad_assert(home->ipaddr.af != AF_UNSPEC);
 678
 679                 /*
 680                  *      Otherwise look up the source IP using the same
 681                  *      address family as the destination IP.
 682                  */
 683                 if (hs_srcipaddr) {
 684                         if (ip_hton(hs_srcipaddr, home->ipaddr.af, &home->src_ipaddr) < 0) {
 685                                 cf_log_err(cf_sectiontoitem(cs), "Failed parsing src_ipaddr");
 686                                 goto error;
 687                         }
 688
 689                 } else {
 690                         /*
 691                          *      Source isn't specified: Source is
 692                          *      the correct address family, but all zeros.
 693                          */
 694                         memset(&home->src_ipaddr, 0, sizeof(home->src_ipaddr));
 695                         home->src_ipaddr.af = home->ipaddr.af;
 696                 }
 697
 698                 if (tls && (home->proto != IPPROTO_TCP)) {
 699                         cf_log_err(cf_sectiontoitem(cs), "TLS transport is not available for UDP sockets.");
 700                         goto error;
 701                 }
 702
 703 #ifndef WITH_TLS
 704
 705                 if (tls) {
 706                         cf_log_err(cf_sectiontoitem(cs), "TLS transport is not available in this executable.");
 707                         goto error;
 708                 }
 709 #else
 710                 /*
 711                  *      Parse the SSL client configuration.
 712                  */
 713                 if (tls) {
 714                         home->tls = tls_client_conf_parse(tls);
 715                         if (!home->tls) {
 716                                 goto error;
 717                         }
 718                 }
 719 #endif
 720
 721         } else if (tls) {
 722                 cf_log_err(cf_sectiontoitem(cs), "Virtual home_servers cannot have a \"tls\" subsection");
 723                 goto error;
 724         }
 725
 726         /*
 727          *      Make sure that this is set.
 728          */
 729         if (home->src_ipaddr.af == AF_UNSPEC) {
 730                 home->src_ipaddr.af = home->ipaddr.af;
 731         }
 732
 733         free(hs_srcipaddr);
 734         hs_srcipaddr = NULL;
 735
 736         if (rbtree_finddata(home_servers_byname, home) != NULL) {
 737                 cf_log_err(cf_sectiontoitem(cs),
 738                            "Duplicate home server name %s.", name2);
 739                 goto error;
 740         }
 741
 742         if (!home->server &&
 743             (rbtree_finddata(home_servers_byaddr, home) != NULL)) {
 744                 cf_log_err(cf_sectiontoitem(cs),
 745                            "Duplicate home server IP %s.", name2);
 746                 goto error;
 747         }
 748
 749         if (!rbtree_insert(home_servers_byname, home)) {
 750                 cf_log_err(cf_sectiontoitem(cs),
 751                            "Internal error %d adding home server %s.",
 752                            __LINE__, name2);
 753                 goto error;
 754         }
 755
 756         if (!home->server &&
 757             !rbtree_insert(home_servers_byaddr, home)) {
 758                 rbtree_deletebydata(home_servers_byname, home);
 759                 cf_log_err(cf_sectiontoitem(cs),
 760                            "Internal error %d adding home server %s.",
 761                            __LINE__, name2);
 762                 goto error;
 763         }
 764
 765 #ifdef WITH_STATS
 766         home->number = home_server_max_number++;
 767         if (!rbtree_insert(home_servers_bynumber, home)) {
 768                 rbtree_deletebydata(home_servers_byname, home);
 769                 if (home->ipaddr.af != AF_UNSPEC) {
 770                         rbtree_deletebydata(home_servers_byname, home);
 771                 }
 772                 cf_log_err(cf_sectiontoitem(cs),
 773                            "Internal error %d adding home server %s.",
 774                            __LINE__, name2);
 775                 goto error;
 776         }
 777 #endif
 778
 779         if (home->max_outstanding < 8) home->max_outstanding = 8;
 780         if (home->max_outstanding > 65536*16) home->max_outstanding = 65536*16;
 781
 782         if (home->ping_interval < 6) home->ping_interval = 6;
 783         if (home->ping_interval > 120) home->ping_interval = 120;
 784
 785         if (home->response_window < 1) home->response_window = 1;
 786         if (home->response_window > 60) home->response_window = 60;
 787         if (home->response_window > mainconfig.max_request_time) home->response_window = mainconfig.max_request_time;
 788
 789         if (home->zombie_period < 1) home->zombie_period = 1;
 790         if (home->zombie_period > 120) home->zombie_period = 120;
 791
 792         if (home->zombie_period < home->response_window) {
 793                 home->zombie_period = home->response_window;
 794         }
 795
 796         if (home->num_pings_to_alive < 3) home->num_pings_to_alive = 3;
 797         if (home->num_pings_to_alive > 10) home->num_pings_to_alive = 10;
 798
 799         if (home->ping_timeout < 3) home->ping_timeout = 3;
 800         if (home->ping_timeout > 10) home->ping_timeout = 10;
 801
 802         if (home->revive_interval < 60) home->revive_interval = 60;
 803         if (home->revive_interval > 3600) home->revive_interval = 3600;
 804
 805 #ifdef WITH_COA
 806         if (home->coa_irt < 1) home->coa_irt = 1;
 807         if (home->coa_irt > 5) home->coa_irt = 5;
 808
 809         if (home->coa_mrc < 0) home->coa_mrc = 0;
 810         if (home->coa_mrc > 20 ) home->coa_mrc = 20;
 811
 812         if (home->coa_mrt < 0) home->coa_mrt = 0;
 813         if (home->coa_mrt > 30 ) home->coa_mrt = 30;
 814
 815         if (home->coa_mrd < 5) home->coa_mrd = 5;
 816         if (home->coa_mrd > 60 ) home->coa_mrd = 60;
 817 #endif
 818
 819         if (home->max_connections > 1024) home->max_connections = 1024;
 820
 821 #ifdef WITH_TCP
 822         /*
 823          *      UDP sockets can't be connection limited.
 824          */
 825         if (home->proto != IPPROTO_TCP) home->max_connections = 0;
 826 #endif
 827
 828         if ((home->idle_timeout > 0) && (home->idle_timeout < 5))
 829                 home->idle_timeout = 5;
 830         if ((home->lifetime > 0) && (home->lifetime < 5))
 831                 home->lifetime = 5;
 832         if ((home->lifetime > 0) && (home->idle_timeout > home->lifetime))
 833                 home->idle_timeout = 0;
 834
 835         tls = cf_item_parent(cf_sectiontoitem(cs));
 836         if (strcmp(cf_section_name1(tls), "server") == 0) {
 837                 home->parent_server = cf_section_name2(tls);
 838         }
 839
 840         if (dual) {
 841                 home_server *home2 = rad_malloc(sizeof(*home2));
 842
 843                 memcpy(home2, home, sizeof(*home2));
 844
 845                 home2->type = HOME_TYPE_ACCT;
 846                 home2->port++;
 847                 home2->ping_user_password = NULL;
 848                 home2->cs = cs;
 849                 home2->parent_server = home->parent_server;
 850
 851                 if (home->no_response_fail == 2) home->no_response_fail = 0;
 852                 if (home2->no_response_fail == 2) home2->no_response_fail = 1;
 853
 854                 if (!rbtree_insert(home_servers_byname, home2)) {
 855                         cf_log_err(cf_sectiontoitem(cs),
 856                                    "Internal error %d adding home server %s.",
 857                                    __LINE__, name2);
 858                         free(home2);
 859                         return 0;
 860                 }
 861
 862                 if (!home->server &&
 863                     !rbtree_insert(home_servers_byaddr, home2)) {
 864                         rbtree_deletebydata(home_servers_byname, home2);
 865                         cf_log_err(cf_sectiontoitem(cs),
 866                                    "Internal error %d adding home server %s.",
 867                                    __LINE__, name2);
 868                         free(home2);
 869                         return 0;
 870                 }
 871
 872 #ifdef WITH_STATS
 873                 home2->number = home_server_max_number++;
 874                 if (!rbtree_insert(home_servers_bynumber, home2)) {
 875                         rbtree_deletebydata(home_servers_byname, home2);
 876                         if (!home2->server) {
 877                                 rbtree_deletebydata(home_servers_byname, home2);
 878                         }
 879                         cf_log_err(cf_sectiontoitem(cs),
 880                                    "Internal error %d adding home server %s.",
 881                                    __LINE__, name2);
 882                         free(home2);
 883                         return 0;
 884                 }
 885 #endif
 886         }
 887
 888         /*
 889          *      Mark it as already processed
 890          */
 891         cf_data_add(cs, "home_server", null_free, null_free);
 892
 893         return 1;
 894 }
 895
 896
 897 static home_pool_t *server_pool_alloc(const char *name, home_pool_type_t type,
 898                                       int server_type, int num_home_servers)
 899 {
 900         home_pool_t *pool;
 901
 902         pool = rad_malloc(sizeof(*pool) + (sizeof(pool->servers[0]) *
 903                                            num_home_servers));
 904         if (!pool) return NULL; /* just for pairanoia */
 905
 906         memset(pool, 0, sizeof(*pool) + (sizeof(pool->servers[0]) *
 907                                          num_home_servers));
 908
 909         pool->name = name;
 910         pool->type = type;
 911         pool->server_type = server_type;
 912         pool->num_home_servers = num_home_servers;
 913
 914         return pool;
 915 }
 916
 917 static int pool_check_home_server(realm_config_t *rc, CONF_PAIR *cp,
 918                                   const char *name, int server_type,
 919                                   home_server **phome)
 920 {
 921         home_server myhome, *home;
 922         CONF_SECTION *server_cs;
 923
 924         if (!name) {
 925                 cf_log_err(cf_pairtoitem(cp),
 926                            "No value given for home_server.");
 927                 return 0;
 928         }
 929
 930         myhome.name = name;
 931         myhome.type = server_type;
 932         home = rbtree_finddata(home_servers_byname, &myhome);
 933         if (home) {
 934                 *phome = home;
 935                 return 1;
 936         }
 937
 938         server_cs = cf_section_sub_find_name2(rc->cs, "home_server", name);
 939         if (!server_cs) {
 940                 cf_log_err(cf_pairtoitem(cp),
 941                            "Unknown home_server \"%s\".", name);
 942                 return 0;
 943         }
 944
 945         home = rbtree_finddata(home_servers_byname, &myhome);
 946         if (!home) {
 947                 cf_log_err(cf_pairtoitem(cp),
 948                            "Internal error %d adding home server \"%s\".",
 949                            __LINE__, name);
 950                 return 0;
 951         }
 952
 953         *phome = home;
 954         return 1;
 955 }
 956
 957
 958 static int server_pool_add(realm_config_t *rc,
 959                            CONF_SECTION *cs, int server_type, int do_print)
 960 {
 961         const char *name2;
 962         home_pool_t *pool = NULL;
 963         const char *value;
 964         CONF_PAIR *cp;
 965         int num_home_servers;
 966         home_server *home;
 967
 968         name2 = cf_section_name1(cs);
 969         if (!name2 || ((strcasecmp(name2, "server_pool") != 0) &&
 970                        (strcasecmp(name2, "home_server_pool") != 0))) {
 971                 cf_log_err(cf_sectiontoitem(cs),
 972                            "Section is not a home_server_pool.");
 973                 return 0;
 974         }
 975
 976         name2 = cf_section_name2(cs);
 977         if (!name2) {
 978                 cf_log_err(cf_sectiontoitem(cs),
 979                            "Server pool section is missing a name.");
 980                 return 0;
 981         }
 982
 983         /*
 984          *      Count the home servers and initalize them.
 985          */
 986         num_home_servers = 0;
 987         for (cp = cf_pair_find(cs, "home_server");
 988              cp != NULL;
 989              cp = cf_pair_find_next(cs, cp, "home_server")) {
 990                 num_home_servers++;
 991
 992                 if (!pool_check_home_server(rc, cp, cf_pair_value(cp),
 993                                             server_type, &home)) {
 994                         return 0;
 995                 }
 996         }
 997
 998         if (num_home_servers == 0) {
 999                 cf_log_err(cf_sectiontoitem(cs),
1000                            "No home servers defined in pool %s",
1001                            name2);
1002                 goto error;
1003         }
1004
1005         pool = server_pool_alloc(name2, HOME_POOL_FAIL_OVER, server_type,
1006                                  num_home_servers);
1007         pool->cs = cs;
1008
1009
1010         /*
1011          *      Fallback servers must be defined, and must be
1012          *      virtual servers.
1013          */
1014         cp = cf_pair_find(cs, "fallback");
1015         if (cp) {
1016 #ifdef WITH_COA
1017                 if (server_type == HOME_TYPE_COA) {
1018                         cf_log_err(cf_sectiontoitem(cs), "Home server pools of type \"coa\" cannot have a fallback virtual server.");
1019                         goto error;
1020                 }
1021 #endif
1022
1023                 if (!pool_check_home_server(rc, cp, cf_pair_value(cp),
1024                                             server_type, &pool->fallback)) {
1025
1026                         goto error;
1027                 }
1028
1029                 if (!pool->fallback->server) {
1030                         cf_log_err(cf_sectiontoitem(cs), "Fallback home_server %s does NOT contain a virtual_server directive.", pool->fallback->name);
1031                         goto error;
1032                 }
1033         }
1034
1035         if (do_print) cf_log_info(cs, " home_server_pool %s {", name2);
1036
1037         cp = cf_pair_find(cs, "type");
1038         if (cp) {
1039                 static FR_NAME_NUMBER pool_types[] = {
1040                         { "load-balance", HOME_POOL_LOAD_BALANCE },
1041                         { "fail-over", HOME_POOL_FAIL_OVER },
1042                         { "round_robin", HOME_POOL_LOAD_BALANCE },
1043                         { "fail_over", HOME_POOL_FAIL_OVER },
1044                         { "client-balance", HOME_POOL_CLIENT_BALANCE },
1045                         { "client-port-balance", HOME_POOL_CLIENT_PORT_BALANCE },
1046                         { "keyed-balance", HOME_POOL_KEYED_BALANCE },
1047                         { NULL, 0 }
1048                 };
1049
1050                 value = cf_pair_value(cp);
1051                 if (!value) {
1052                         cf_log_err(cf_pairtoitem(cp),
1053                                    "No value given for type.");
1054                         goto error;
1055                 }
1056
1057                 pool->type = fr_str2int(pool_types, value, 0);
1058                 if (!pool->type) {
1059                         cf_log_err(cf_pairtoitem(cp),
1060                                    "Unknown type \"%s\".",
1061                                    value);
1062                         goto error;
1063                 }
1064
1065                 if (do_print) cf_log_info(cs, "\ttype = %s", value);
1066         }
1067
1068         cp = cf_pair_find(cs, "virtual_server");
1069         if (cp) {
1070                 pool->virtual_server = cf_pair_value(cp);
1071                 if (!pool->virtual_server) {
1072                         cf_log_err(cf_pairtoitem(cp), "No value given for virtual_server");
1073                         goto error;
1074                 }
1075
1076                 if (do_print) {
1077                         cf_log_info(cs, "\tvirtual_server = %s", pool->virtual_server);
1078                 }
1079
1080                 if (!cf_section_sub_find_name2(rc->cs, "server",
1081                                                pool->virtual_server)) {
1082                         cf_log_err(cf_pairtoitem(cp), "No such server %s",
1083                                    pool->virtual_server);
1084                         goto error;
1085                 }
1086
1087         }
1088
1089         num_home_servers = 0;
1090         for (cp = cf_pair_find(cs, "home_server");
1091              cp != NULL;
1092              cp = cf_pair_find_next(cs, cp, "home_server")) {
1093                 home_server myhome;
1094
1095                 value = cf_pair_value(cp);
1096
1097                 memset(&myhome, 0, sizeof(myhome));
1098                 myhome.name = value;
1099                 myhome.type = server_type;
1100
1101                 home = rbtree_finddata(home_servers_byname, &myhome);
1102                 if (!home) {
1103                         DEBUG2("Internal sanity check failed");
1104                         goto error;
1105                 }
1106
1107                 if (0) {
1108                         DEBUG2("Warning: Duplicate home server %s in server pool %s", home->name, pool->name);
1109                         continue;
1110                 }
1111
1112                 if (do_print) cf_log_info(cs, "\thome_server = %s", home->name);
1113                 pool->servers[num_home_servers++] = home;
1114         } /* loop over home_server's */
1115
1116         if (pool->fallback && do_print) {
1117                 cf_log_info(cs, "\tfallback = %s", pool->fallback->name);
1118         }
1119
1120         if (!rbtree_insert(home_pools_byname, pool)) {
1121                 rad_assert("Internal sanity check failed");
1122                 goto error;
1123         }
1124
1125         if (do_print) cf_log_info(cs, " }");
1126
1127         cf_data_add(cs, "home_server_pool", pool, free);
1128
1129         rad_assert(pool->server_type != 0);
1130
1131         return 1;
1132
1133  error:
1134         if (do_print) cf_log_info(cs, " }");
1135         free(pool);
1136         return 0;
1137 }
1138 #endif
1139
1140 static int old_server_add(realm_config_t *rc, CONF_SECTION *cs,
1141                           const char *realm,
1142                           const char *name, const char *secret,
1143                           home_pool_type_t ldflag, home_pool_t **pool_p,
1144                           int type, const char *server)
1145 {
1146 #ifdef WITH_PROXY
1147         int i, insert_point, num_home_servers;
1148         home_server myhome, *home;
1149         home_pool_t mypool, *pool;
1150         CONF_SECTION *subcs;
1151 #else
1152         rc = rc;                /* -Wunused */
1153         realm = realm;
1154         secret = secret;
1155         ldflag = ldflag;
1156         type = type;
1157         server = server;
1158 #endif
1159
1160         /*
1161          *      LOCAL realms get sanity checked, and nothing else happens.
1162          */
1163         if (strcmp(name, "LOCAL") == 0) {
1164                 if (*pool_p) {
1165                         cf_log_err(cf_sectiontoitem(cs), "Realm \"%s\" cannot be both LOCAL and remote", name);
1166                         return 0;
1167                 }
1168                 return 1;
1169         }
1170
1171 #ifndef WITH_PROXY
1172         return 0;               /* Not proxying.  Can't do non-LOCAL realms */
1173
1174 #else
1175         mypool.name = realm;
1176         mypool.server_type = type;
1177         pool = rbtree_finddata(home_pools_byname, &mypool);
1178         if (pool) {
1179                 if (pool->type != ldflag) {
1180                         cf_log_err(cf_sectiontoitem(cs), "Inconsistent ldflag for server pool \"%s\"", name);
1181                         return 0;
1182                 }
1183
1184                 if (pool->server_type != type) {
1185                         cf_log_err(cf_sectiontoitem(cs), "Inconsistent home server type for server pool \"%s\"", name);
1186                         return 0;
1187                 }
1188         }
1189
1190         myhome.name = name;
1191         myhome.type = type;
1192         home = rbtree_finddata(home_servers_byname, &myhome);
1193         if (home) {
1194                 if (secret && (strcmp(home->secret, secret) != 0)) {
1195                         cf_log_err(cf_sectiontoitem(cs), "Inconsistent shared secret for home server \"%s\"", name);
1196                         return 0;
1197                 }
1198
1199                 if (home->type != type) {
1200                         cf_log_err(cf_sectiontoitem(cs), "Inconsistent type for home server \"%s\"", name);
1201                         return 0;
1202                 }
1203
1204                 /*
1205                  *      See if the home server is already listed
1206                  *      in the pool.  If so, do nothing else.
1207                  */
1208                 if (pool) for (i = 0; i < pool->num_home_servers; i++) {
1209                         if (pool->servers[i] == home) {
1210                                 return 1;
1211                         }
1212                 }
1213         }
1214
1215         /*
1216          *      If we do have a pool, check that there is room to
1217          *      insert the home server we've found, or the one that we
1218          *      create here.
1219          *
1220          *      Note that we insert it into the LAST available
1221          *      position, in order to maintain the same order as in
1222          *      the configuration files.
1223          */
1224         insert_point = -1;
1225         if (pool) {
1226                 for (i = pool->num_home_servers - 1; i >= 0; i--) {
1227                         if (pool->servers[i]) break;
1228
1229                         if (!pool->servers[i]) {
1230                                 insert_point = i;
1231                         }
1232                 }
1233
1234                 if (insert_point < 0) {
1235                         cf_log_err(cf_sectiontoitem(cs), "No room in pool to add home server \"%s\".  Please update the realm configuration to use the new-style home servers and server pools.", name);
1236                         return 0;
1237                 }
1238         }
1239
1240         /*
1241          *      No home server, allocate one.
1242          */
1243         if (!home) {
1244                 const char *p;
1245                 char *q;
1246
1247                 home = rad_malloc(sizeof(*home));
1248                 memset(home, 0, sizeof(*home));
1249
1250                 home->name = name;
1251                 home->hostname = name;
1252                 home->type = type;
1253                 home->secret = secret;
1254                 home->cs = cs;
1255                 home->proto = IPPROTO_UDP;
1256
1257                 p = strchr(name, ':');
1258                 if (!p) {
1259                         if (type == HOME_TYPE_AUTH) {
1260                                 home->port = PW_AUTH_UDP_PORT;
1261                         } else {
1262                                 home->port = PW_ACCT_UDP_PORT;
1263                         }
1264
1265                         p = name;
1266                         q = NULL;
1267
1268                 } else if (p == name) {
1269                                 cf_log_err(cf_sectiontoitem(cs),
1270                                            "Invalid hostname %s.",
1271                                            name);
1272                                 free(home);
1273                                 return 0;
1274
1275                 } else {
1276                         home->port = atoi(p + 1);
1277                         if ((home->port == 0) || (home->port > 65535)) {
1278                                 cf_log_err(cf_sectiontoitem(cs),
1279                                            "Invalid port %s.",
1280                                            p + 1);
1281                                 free(home);
1282                                 return 0;
1283                         }
1284
1285                         q = rad_malloc((p - name) + 1);
1286                         memcpy(q, name, (p - name));
1287                         q[p - name] = '\0';
1288                         p = q;
1289                 }
1290
1291                 if (!server) {
1292                         if (ip_hton(p, AF_UNSPEC, &home->ipaddr) < 0) {
1293                                 cf_log_err(cf_sectiontoitem(cs),
1294                                            "Failed looking up hostname %s.",
1295                                            p);
1296                                 free(home);
1297                                 free(q);
1298                                 return 0;
1299                         }
1300                         home->src_ipaddr.af = home->ipaddr.af;
1301                 } else {
1302                         home->ipaddr.af = AF_UNSPEC;
1303                         home->server = server;
1304                 }
1305                 free(q);
1306
1307                 /*
1308                  *      Use the old-style configuration.
1309                  */
1310                 home->max_outstanding = 65535*16;
1311                 home->zombie_period = rc->retry_delay * rc->retry_count;
1312                 if (home->zombie_period == 0) home->zombie_period =30;
1313                 home->response_window = home->zombie_period - 1;
1314
1315                 home->ping_check = HOME_PING_CHECK_NONE;
1316
1317                 home->revive_interval = rc->dead_time;
1318
1319                 if (rbtree_finddata(home_servers_byaddr, home)) {
1320                         cf_log_err(cf_sectiontoitem(cs), "Home server %s has the same IP address and/or port as another home server.", name);
1321                         free(home);
1322                         return 0;
1323                 }
1324
1325                 if (!rbtree_insert(home_servers_byname, home)) {
1326                         cf_log_err(cf_sectiontoitem(cs), "Internal error %d adding home server %s.", __LINE__, name);
1327                         free(home);
1328                         return 0;
1329                 }
1330
1331                 if (!rbtree_insert(home_servers_byaddr, home)) {
1332                         rbtree_deletebydata(home_servers_byname, home);
1333                         cf_log_err(cf_sectiontoitem(cs), "Internal error %d adding home server %s.", __LINE__, name);
1334                         free(home);
1335                         return 0;
1336                 }
1337
1338 #ifdef WITH_STATS
1339                 home->number = home_server_max_number++;
1340                 if (!rbtree_insert(home_servers_bynumber, home)) {
1341                         rbtree_deletebydata(home_servers_byname, home);
1342                         if (home->ipaddr.af != AF_UNSPEC) {
1343                                 rbtree_deletebydata(home_servers_byname, home);
1344                         }
1345                         cf_log_err(cf_sectiontoitem(cs),
1346                                    "Internal error %d adding home server %s.",
1347                                    __LINE__, name);
1348                         free(home);
1349                         return 0;
1350                 }
1351 #endif
1352         }
1353
1354         /*
1355          *      We now have a home server, see if we can insert it
1356          *      into pre-existing pool.
1357          */
1358         if (insert_point >= 0) {
1359                 rad_assert(pool != NULL);
1360                 pool->servers[insert_point] = home;
1361                 return 1;
1362         }
1363
1364         rad_assert(pool == NULL);
1365         rad_assert(home != NULL);
1366
1367         /*
1368          *      Count the old-style realms of this name.
1369          */
1370         num_home_servers = 0;
1371         for (subcs = cf_section_find_next(cs, NULL, "realm");
1372              subcs != NULL;
1373              subcs = cf_section_find_next(cs, subcs, "realm")) {
1374                 const char *this = cf_section_name2(subcs);
1375
1376                 if (!this || (strcmp(this, realm) != 0)) continue;
1377                 num_home_servers++;
1378         }
1379
1380         if (num_home_servers == 0) {
1381                 cf_log_err(cf_sectiontoitem(cs), "Internal error counting pools for home server %s.", name);
1382                 free(home);
1383                 return 0;
1384         }
1385
1386         pool = server_pool_alloc(realm, ldflag, type, num_home_servers);
1387         pool->cs = cs;
1388
1389         pool->servers[0] = home;
1390
1391         if (!rbtree_insert(home_pools_byname, pool)) {
1392                 rad_assert("Internal sanity check failed");
1393                 return 0;
1394         }
1395
1396         *pool_p = pool;
1397
1398         return 1;
1399 #endif
1400 }
1401
1402 static int old_realm_config(realm_config_t *rc, CONF_SECTION *cs, REALM *r)
1403 {
1404         const char *host;
1405         const char *secret = NULL;
1406         home_pool_type_t ldflag;
1407         CONF_PAIR *cp;
1408
1409         cp = cf_pair_find(cs, "ldflag");
1410         ldflag = HOME_POOL_FAIL_OVER;
1411         if (cp) {
1412                 host = cf_pair_value(cp);
1413                 if (!host) {
1414                         cf_log_err(cf_pairtoitem(cp), "No value specified for ldflag");
1415                         return 0;
1416                 }
1417
1418                 if (strcasecmp(host, "fail_over") == 0) {
1419                         cf_log_info(cs, "\tldflag = fail_over");
1420
1421                 } else if (strcasecmp(host, "round_robin") == 0) {
1422                         ldflag = HOME_POOL_LOAD_BALANCE;
1423                         cf_log_info(cs, "\tldflag = round_robin");
1424
1425                 } else {
1426                         cf_log_err(cf_sectiontoitem(cs), "Unknown value \"%s\" for ldflag", host);
1427                         return 0;
1428                 }
1429         } /* else don't print it. */
1430
1431         /*
1432          *      Allow old-style if it doesn't exist, or if it exists and
1433          *      it's LOCAL.
1434          */
1435         cp = cf_pair_find(cs, "authhost");
1436         if (cp) {
1437                 host = cf_pair_value(cp);
1438                 if (!host) {
1439                         cf_log_err(cf_pairtoitem(cp), "No value specified for authhost");
1440                         return 0;
1441                 }
1442
1443                 if (strcmp(host, "LOCAL") != 0) {
1444                         cp = cf_pair_find(cs, "secret");
1445                         if (!cp) {
1446                                 cf_log_err(cf_sectiontoitem(cs), "No shared secret supplied for realm: %s", r->name);
1447                                 return 0;
1448                         }
1449
1450                         secret = cf_pair_value(cp);
1451                         if (!secret) {
1452                                 cf_log_err(cf_pairtoitem(cp), "No value specified for secret");
1453                                 return 0;
1454                         }
1455                 }
1456
1457                 cf_log_info(cs, "\tauthhost = %s",  host);
1458
1459                 if (!old_server_add(rc, cs, r->name, host, secret, ldflag,
1460                                     &r->auth_pool, HOME_TYPE_AUTH, NULL)) {
1461                         return 0;
1462                 }
1463         }
1464
1465         cp = cf_pair_find(cs, "accthost");
1466         if (cp) {
1467                 host = cf_pair_value(cp);
1468                 if (!host) {
1469                         cf_log_err(cf_pairtoitem(cp), "No value specified for accthost");
1470                         return 0;
1471                 }
1472
1473                 /*
1474                  *      Don't look for a secret again if it was found
1475                  *      above.
1476                  */
1477                 if ((strcmp(host, "LOCAL") != 0) && !secret) {
1478                         cp = cf_pair_find(cs, "secret");
1479                         if (!cp) {
1480                                 cf_log_err(cf_sectiontoitem(cs), "No shared secret supplied for realm: %s", r->name);
1481                                 return 0;
1482                         }
1483
1484                         secret = cf_pair_value(cp);
1485                         if (!secret) {
1486                                 cf_log_err(cf_pairtoitem(cp), "No value specified for secret");
1487                                 return 0;
1488                         }
1489                 }
1490
1491                 cf_log_info(cs, "\taccthost = %s", host);
1492
1493                 if (!old_server_add(rc, cs, r->name, host, secret, ldflag,
1494                                     &r->acct_pool, HOME_TYPE_ACCT, NULL)) {
1495                         return 0;
1496                 }
1497         }
1498
1499         cp = cf_pair_find(cs, "virtual_server");
1500         if (cp) {
1501                 host = cf_pair_value(cp);
1502                 if (!host) {
1503                         cf_log_err(cf_pairtoitem(cp), "No value specified for virtual_server");
1504                         return 0;
1505                 }
1506
1507                 cf_log_info(cs, "\tvirtual_server = %s", host);
1508
1509                 if (!old_server_add(rc, cs, r->name, host, "", ldflag,
1510                                     &r->auth_pool, HOME_TYPE_AUTH, host)) {
1511                         return 0;
1512                 }
1513                 if (!old_server_add(rc, cs, r->name, host, "", ldflag,
1514                                     &r->acct_pool, HOME_TYPE_ACCT, host)) {
1515                         return 0;
1516                 }
1517         }
1518
1519         if (secret) cf_log_info(cs, "\tsecret = %s", secret);
1520
1521         return 1;
1522
1523 }
1524
1525
1526 #ifdef WITH_PROXY
1527 static int add_pool_to_realm(realm_config_t *rc, CONF_SECTION *cs,
1528                              const char *name, home_pool_t **dest,
1529                              int server_type, int do_print)
1530 {
1531         home_pool_t mypool, *pool;
1532
1533         mypool.name = name;
1534         mypool.server_type = server_type;
1535
1536         pool = rbtree_finddata(home_pools_byname, &mypool);
1537         if (!pool) {
1538                 CONF_SECTION *pool_cs;
1539
1540                 pool_cs = cf_section_sub_find_name2(rc->cs,
1541                                                     "home_server_pool",
1542                                                     name);
1543                 if (!pool_cs) {
1544                         pool_cs = cf_section_sub_find_name2(rc->cs,
1545                                                             "server_pool",
1546                                                             name);
1547                 }
1548                 if (!pool_cs) {
1549                         cf_log_err(cf_sectiontoitem(cs), "Failed to find home_server_pool \"%s\"", name);
1550                         return 0;
1551                 }
1552
1553                 if (!server_pool_add(rc, pool_cs, server_type, do_print)) {
1554                         return 0;
1555                 }
1556
1557                 pool = rbtree_finddata(home_pools_byname, &mypool);
1558                 if (!pool) {
1559                         radlog(L_ERR, "Internal sanity check failed in add_pool_to_realm");
1560                         return 0;
1561                 }
1562         }
1563
1564         if (pool->server_type != server_type) {
1565                 cf_log_err(cf_sectiontoitem(cs), "Incompatible home_server_pool \"%s\" (mixed auth_pool / acct_pool)", name);
1566                 return 0;
1567         }
1568
1569         *dest = pool;
1570
1571         return 1;
1572 }
1573 #endif
1574
1575
1576 static int realm_add(realm_config_t *rc, CONF_SECTION *cs)
1577 {
1578         const char *name2;
1579         REALM *r = NULL;
1580         CONF_PAIR *cp;
1581 #ifdef WITH_PROXY
1582         home_pool_t *auth_pool, *acct_pool;
1583         const char *auth_pool_name, *acct_pool_name;
1584 #endif
1585
1586         name2 = cf_section_name1(cs);
1587         if (!name2 || (strcasecmp(name2, "realm") != 0)) {
1588                 cf_log_err(cf_sectiontoitem(cs), "Section is not a realm.");
1589                 return 0;
1590         }
1591
1592         name2 = cf_section_name2(cs);
1593         if (!name2) {
1594                 cf_log_err(cf_sectiontoitem(cs), "Realm section is missing the realm name.");
1595                 return 0;
1596         }
1597
1598 #ifdef WITH_PROXY
1599         auth_pool = acct_pool = NULL;
1600         auth_pool_name = acct_pool_name = NULL;
1601
1602         /*
1603          *      Prefer new configuration to old one.
1604          */
1605         cp = cf_pair_find(cs, "pool");
1606         if (!cp) cp = cf_pair_find(cs, "home_server_pool");
1607         if (cp) auth_pool_name = cf_pair_value(cp);
1608         if (cp && auth_pool_name) {
1609                 acct_pool_name = auth_pool_name;
1610                 if (!add_pool_to_realm(rc, cs,
1611                                        auth_pool_name, &auth_pool,
1612                                        HOME_TYPE_AUTH, 1)) {
1613                         return 0;
1614                 }
1615                 if (!add_pool_to_realm(rc, cs,
1616                                        auth_pool_name, &acct_pool,
1617                                        HOME_TYPE_ACCT, 0)) {
1618                         return 0;
1619                 }
1620         }
1621
1622         cp = cf_pair_find(cs, "auth_pool");
1623         if (cp) auth_pool_name = cf_pair_value(cp);
1624         if (cp && auth_pool_name) {
1625                 if (auth_pool) {
1626                         cf_log_err(cf_sectiontoitem(cs), "Cannot use \"pool\" and \"auth_pool\" at the same time.");
1627                         return 0;
1628                 }
1629                 if (!add_pool_to_realm(rc, cs,
1630                                        auth_pool_name, &auth_pool,
1631                                        HOME_TYPE_AUTH, 1)) {
1632                         return 0;
1633                 }
1634         }
1635
1636         cp = cf_pair_find(cs, "acct_pool");
1637         if (cp) acct_pool_name = cf_pair_value(cp);
1638         if (cp && acct_pool_name) {
1639                 int do_print = TRUE;
1640
1641                 if (acct_pool) {
1642                         cf_log_err(cf_sectiontoitem(cs), "Cannot use \"pool\" and \"acct_pool\" at the same time.");
1643                         return 0;
1644                 }
1645
1646                 if (!auth_pool ||
1647                     (auth_pool_name &&
1648                      (strcmp(auth_pool_name, acct_pool_name) != 0))) {
1649                         do_print = TRUE;
1650                 }
1651
1652                 if (!add_pool_to_realm(rc, cs,
1653                                        acct_pool_name, &acct_pool,
1654                                        HOME_TYPE_ACCT, do_print)) {
1655                         return 0;
1656                 }
1657         }
1658 #endif
1659
1660         cf_log_info(cs, " realm %s {", name2);
1661
1662 #ifdef WITH_PROXY
1663         /*
1664          *      The realm MAY already exist if it's an old-style realm.
1665          *      In that case, merge the old-style realm with this one.
1666          */
1667         r = realm_find2(name2);
1668         if (r && (strcmp(r->name, name2) == 0)) {
1669                 if (cf_pair_find(cs, "auth_pool") ||
1670                     cf_pair_find(cs, "acct_pool")) {
1671                         cf_log_err(cf_sectiontoitem(cs), "Duplicate realm \"%s\"", name2);
1672                         goto error;
1673                 }
1674
1675                 if (!old_realm_config(rc, cs, r)) {
1676                         goto error;
1677                 }
1678
1679                 cf_log_info(cs, " } # realm %s", name2);
1680                 return 1;
1681         }
1682 #endif
1683
1684 #ifdef HAVE_REGEX_H
1685         if (name2[0] == '~') {
1686                 int rcode;
1687                 regex_t reg;
1688
1689                 /*
1690                  *      Include substring matches.
1691                  */
1692                 rcode = regcomp(&reg, name2 + 1,
1693                                 REG_EXTENDED | REG_NOSUB | REG_ICASE);
1694                 if (rcode != 0) {
1695                         char buffer[256];
1696
1697                         regerror(rcode, &reg, buffer, sizeof(buffer));
1698
1699                         cf_log_err(cf_sectiontoitem(cs),
1700                                    "Invalid regex \"%s\": %s",
1701                                    name2 + 1, buffer);
1702                         goto error;
1703                 }
1704                 regfree(&reg);
1705         }
1706 #endif
1707
1708         r = rad_malloc(sizeof(*r));
1709         memset(r, 0, sizeof(*r));
1710
1711         r->name = name2;
1712         r->striprealm = 1;
1713 #ifdef WITH_PROXY
1714         r->auth_pool = auth_pool;
1715         r->acct_pool = acct_pool;
1716
1717         if (auth_pool_name &&
1718             (auth_pool_name == acct_pool_name)) { /* yes, ptr comparison */
1719                 cf_log_info(cs, "\tpool = %s", auth_pool_name);
1720         } else {
1721                 if (auth_pool_name) cf_log_info(cs, "\tauth_pool = %s", auth_pool_name);
1722                 if (acct_pool_name) cf_log_info(cs, "\tacct_pool = %s", acct_pool_name);
1723         }
1724 #endif
1725
1726         cp = cf_pair_find(cs, "nostrip");
1727         if (cp && (cf_pair_value(cp) == NULL)) {
1728                 r->striprealm = 0;
1729                 cf_log_info(cs, "\tnostrip");
1730         }
1731
1732         /*
1733          *      We're a new-style realm.  Complain if we see the old
1734          *      directives.
1735          */
1736         if (r->auth_pool || r->acct_pool) {
1737                 if (((cp = cf_pair_find(cs, "authhost")) != NULL) ||
1738                     ((cp = cf_pair_find(cs, "accthost")) != NULL) ||
1739                     ((cp = cf_pair_find(cs, "secret")) != NULL) ||
1740                     ((cp = cf_pair_find(cs, "ldflag")) != NULL)) {
1741                         DEBUG2("WARNING: Ignoring old-style configuration entry \"%s\" in realm \"%s\"", cf_pair_attr(cp), r->name);
1742                 }
1743
1744
1745                 /*
1746                  *      The realm MAY be an old-style realm, as there
1747                  *      was no auth_pool or acct_pool.  Double-check
1748                  *      it, just to be safe.
1749                  */
1750         } else if (!old_realm_config(rc, cs, r)) {
1751                 goto error;
1752         }
1753
1754 #ifdef HAVE_REGEX_H
1755         /*
1756          *      It's a regex.  Add it to a separate list.
1757          */
1758         if (name2[0] == '~') {
1759                 realm_regex_t *rr, **last;
1760
1761                 rr = rad_malloc(sizeof(*rr));
1762
1763                 last = &realms_regex;
1764                 while (*last) last = &((*last)->next);  /* O(N^2)... sue me. */
1765
1766                 r->name = name2;
1767                 rr->realm = r;
1768                 rr->next = NULL;
1769
1770                 *last = rr;
1771
1772                 cf_log_info(cs, " }");
1773                 return 1;
1774         }
1775 #endif
1776
1777         if (!rbtree_insert(realms_byname, r)) {
1778                 rad_assert("Internal sanity check failed");
1779                 goto error;
1780         }
1781
1782         cf_log_info(cs, " }");
1783
1784         return 1;
1785
1786  error:
1787         cf_log_info(cs, " } # realm %s", name2);
1788         free(r);
1789         return 0;
1790 }
1791
1792 #ifdef WITH_COA
1793 static const FR_NAME_NUMBER home_server_types[] = {
1794         { "auth", HOME_TYPE_AUTH },
1795         { "auth+acct", HOME_TYPE_AUTH },
1796         { "acct", HOME_TYPE_ACCT },
1797         { "coa", HOME_TYPE_COA },
1798         { NULL, 0 }
1799 };
1800
1801 static int pool_peek_type(CONF_SECTION *config, CONF_SECTION *cs)
1802 {
1803         int home;
1804         const char *name, *type;
1805         CONF_PAIR *cp;
1806         CONF_SECTION *server_cs;
1807
1808         cp = cf_pair_find(cs, "home_server");
1809         if (!cp) {
1810                 cf_log_err(cf_sectiontoitem(cs), "Pool does not contain a \"home_server\" entry");
1811                 return HOME_TYPE_INVALID;
1812         }
1813
1814         name = cf_pair_value(cp);
1815         if (!name) {
1816                 cf_log_err(cf_pairtoitem(cp), "home_server entry does not reference a home server");
1817                 return HOME_TYPE_INVALID;
1818         }
1819
1820         server_cs = cf_section_sub_find_name2(config, "home_server", name);
1821         if (!server_cs) {
1822                 cf_log_err(cf_pairtoitem(cp), "home_server \"%s\" does not exist", name);
1823                 return HOME_TYPE_INVALID;
1824         }
1825
1826         cp = cf_pair_find(server_cs, "type");
1827         if (!cp) {
1828                 cf_log_err(cf_sectiontoitem(server_cs), "home_server %s does not contain a \"type\" entry", name);
1829                 return HOME_TYPE_INVALID;
1830         }
1831
1832         type = cf_pair_value(cp);
1833         if (!type) {
1834                 cf_log_err(cf_sectiontoitem(server_cs), "home_server %s contains an empty \"type\" entry", name);
1835                 return HOME_TYPE_INVALID;
1836         }
1837
1838         home = fr_str2int(home_server_types, type, HOME_TYPE_INVALID);
1839         if (home == HOME_TYPE_INVALID) {
1840                 cf_log_err(cf_sectiontoitem(server_cs), "home_server %s contains an invalid \"type\" entry of value \"%s\"", name, type);
1841                 return HOME_TYPE_INVALID;
1842         }
1843
1844         return home;            /* 'cause we miss it so much */
1845 }
1846 #endif
1847
1848 int realms_init(CONF_SECTION *config)
1849 {
1850         CONF_SECTION *cs;
1851 #ifdef WITH_PROXY
1852         CONF_SECTION *server_cs;
1853 #endif
1854         realm_config_t *rc, *old_rc;
1855
1856         if (realms_byname) return 1;
1857
1858         realms_byname = rbtree_create(realm_name_cmp, free, 0);
1859         if (!realms_byname) {
1860                 realms_free();
1861                 return 0;
1862         }
1863
1864 #ifdef WITH_PROXY
1865         home_servers_byaddr = rbtree_create(home_server_addr_cmp, home_server_free, 0);
1866         if (!home_servers_byaddr) {
1867                 realms_free();
1868                 return 0;
1869         }
1870
1871         home_servers_byname = rbtree_create(home_server_name_cmp, NULL, 0);
1872         if (!home_servers_byname) {
1873                 realms_free();
1874                 return 0;
1875         }
1876
1877 #ifdef WITH_STATS
1878         home_servers_bynumber = rbtree_create(home_server_number_cmp, NULL, 0);
1879         if (!home_servers_bynumber) {
1880                 realms_free();
1881                 return 0;
1882         }
1883 #endif
1884
1885         home_pools_byname = rbtree_create(home_pool_name_cmp, NULL, 0);
1886         if (!home_pools_byname) {
1887                 realms_free();
1888                 return 0;
1889         }
1890 #endif
1891
1892         rc = rad_malloc(sizeof(*rc));
1893         memset(rc, 0, sizeof(*rc));
1894         rc->cs = config;
1895
1896 #ifdef WITH_PROXY
1897         cs = cf_subsection_find_next(config, NULL, "proxy");
1898         if (cs) {
1899                 cf_section_parse(cs, rc, proxy_config);
1900         } else {
1901                 rc->dead_time = DEAD_TIME;
1902                 rc->retry_count = RETRY_COUNT;
1903                 rc->retry_delay = RETRY_DELAY;
1904                 rc->fallback = 0;
1905                 rc->wake_all_if_all_dead= 0;
1906         }
1907
1908         for (cs = cf_subsection_find_next(config, NULL, "home_server");
1909              cs != NULL;
1910              cs = cf_subsection_find_next(config, cs, "home_server")) {
1911                 if (!home_server_add(rc, cs)) {
1912                         free(rc);
1913                         realms_free();
1914                         return 0;
1915                 }
1916         }
1917
1918         /*
1919          *      Loop over virtual servers to find homes which are
1920          *      defined in them.
1921          */
1922         for (server_cs = cf_subsection_find_next(config, NULL, "server");
1923              server_cs != NULL;
1924              server_cs = cf_subsection_find_next(config, server_cs, "server")) {
1925                 for (cs = cf_subsection_find_next(server_cs, NULL, "home_server");
1926                      cs != NULL;
1927                      cs = cf_subsection_find_next(server_cs, cs, "home_server")) {
1928                         if (!home_server_add(rc, cs)) {
1929                                 free(rc);
1930                                 realms_free();
1931                                 return 0;
1932                         }
1933                 }
1934         }
1935 #endif
1936
1937         for (cs = cf_subsection_find_next(config, NULL, "realm");
1938              cs != NULL;
1939              cs = cf_subsection_find_next(config, cs, "realm")) {
1940                 if (!realm_add(rc, cs)) {
1941                         free(rc);
1942                         realms_free();
1943                         return 0;
1944                 }
1945         }
1946
1947 #ifdef WITH_COA
1948         /*
1949          *      CoA pools aren't tied to realms.
1950          */
1951         for (cs = cf_subsection_find_next(config, NULL, "home_server_pool");
1952              cs != NULL;
1953              cs = cf_subsection_find_next(config, cs, "home_server_pool")) {
1954                 int type;
1955
1956                 /*
1957                  *      Pool was already loaded.
1958                  */
1959                 if (cf_data_find(cs, "home_server_pool")) continue;
1960
1961                 type = pool_peek_type(config, cs);
1962                 if (type == HOME_TYPE_INVALID) {
1963                         free(rc);
1964                         realms_free();
1965                         return 0;
1966                 }
1967
1968                 if (!server_pool_add(rc, cs, type, TRUE)) {
1969                         free(rc);
1970                         realms_free();
1971                         return 0;
1972                 }
1973         }
1974 #endif
1975
1976
1977 #ifdef WITH_PROXY
1978         xlat_register("home_server", xlat_home_server, NULL);
1979         xlat_register("home_server_pool", xlat_server_pool, NULL);
1980 #endif
1981
1982         /*
1983          *      Swap pointers atomically.
1984          */
1985         old_rc = realm_config;
1986         realm_config = rc;
1987         free(old_rc);
1988
1989         return 1;
1990 }
1991
1992 /*
1993  *      Find a realm where "name" might be the regex.
1994  */
1995 REALM *realm_find2(const char *name)
1996 {
1997         REALM myrealm;
1998         REALM *realm;
1999
2000         if (!name) name = "NULL";
2001
2002         myrealm.name = name;
2003         realm = rbtree_finddata(realms_byname, &myrealm);
2004         if (realm) return realm;
2005
2006 #ifdef HAVE_REGEX_H
2007         if (realms_regex) {
2008                 realm_regex_t *this;
2009
2010                 for (this = realms_regex; this != NULL; this = this->next) {
2011                         if (strcmp(this->realm->name, name) == 0) {
2012                                 return this->realm;
2013                         }
2014                 }
2015         }
2016 #endif
2017
2018         /*
2019          *      Couldn't find a realm.  Look for DEFAULT.
2020          */
2021         myrealm.name = "DEFAULT";
2022         return rbtree_finddata(realms_byname, &myrealm);
2023 }
2024
2025
2026 /*
2027  *      Find a realm in the REALM list.
2028  */
2029 REALM *realm_find(const char *name)
2030 {
2031         REALM myrealm;
2032         REALM *realm;
2033
2034         if (!name) name = "NULL";
2035
2036         myrealm.name = name;
2037         realm = rbtree_finddata(realms_byname, &myrealm);
2038         if (realm) return realm;
2039
2040 #ifdef HAVE_REGEX_H
2041         if (realms_regex) {
2042                 realm_regex_t *this;
2043
2044                 for (this = realms_regex; this != NULL; this = this->next) {
2045                         int compare;
2046                         regex_t reg;
2047
2048                         /*
2049                          *      Include substring matches.
2050                          */
2051                         if (regcomp(&reg, this->realm->name + 1,
2052                                     REG_EXTENDED | REG_NOSUB | REG_ICASE) != 0) {
2053                                 continue;
2054                         }
2055
2056                         compare = regexec(&reg, name, 0, NULL, 0);
2057                         regfree(&reg);
2058
2059                         if (compare == 0) return this->realm;
2060                 }
2061         }
2062 #endif
2063
2064         /*
2065          *      Couldn't find a realm.  Look for DEFAULT.
2066          */
2067         myrealm.name = "DEFAULT";
2068         return rbtree_finddata(realms_byname, &myrealm);
2069 }
2070
2071
2072 #ifdef WITH_PROXY
2073 home_server *home_server_ldb(const char *realmname,
2074                              home_pool_t *pool, REQUEST *request)
2075 {
2076         int             start;
2077         int             count;
2078         home_server     *found = NULL;
2079         home_server     *zombie = NULL;
2080         VALUE_PAIR      *vp;
2081
2082         /*
2083          *      Determine how to pick choose the home server.
2084          */
2085         switch (pool->type) {
2086                 uint32_t hash;
2087
2088                 /*
2089                  *      For load-balancing by client IP address, we
2090                  *      pick a home server by hashing the client IP.
2091                  *
2092                  *      This isn't as even a load distribution as
2093                  *      tracking the State attribute, but it's better
2094                  *      than nothing.
2095                  */
2096         case HOME_POOL_CLIENT_BALANCE:
2097                 switch (request->packet->src_ipaddr.af) {
2098                 case AF_INET:
2099                         hash = fr_hash(&request->packet->src_ipaddr.ipaddr.ip4addr,
2100                                          sizeof(request->packet->src_ipaddr.ipaddr.ip4addr));
2101                         break;
2102                 case AF_INET6:
2103                         hash = fr_hash(&request->packet->src_ipaddr.ipaddr.ip6addr,
2104                                          sizeof(request->packet->src_ipaddr.ipaddr.ip6addr));
2105                         break;
2106                 default:
2107                         hash = 0;
2108                         break;
2109                 }
2110                 start = hash % pool->num_home_servers;
2111                 break;
2112
2113         case HOME_POOL_CLIENT_PORT_BALANCE:
2114                 switch (request->packet->src_ipaddr.af) {
2115                 case AF_INET:
2116                         hash = fr_hash(&request->packet->src_ipaddr.ipaddr.ip4addr,
2117                                          sizeof(request->packet->src_ipaddr.ipaddr.ip4addr));
2118                         break;
2119                 case AF_INET6:
2120                         hash = fr_hash(&request->packet->src_ipaddr.ipaddr.ip6addr,
2121                                          sizeof(request->packet->src_ipaddr.ipaddr.ip6addr));
2122                         break;
2123                 default:
2124                         hash = 0;
2125                         break;
2126                 }
2127                 fr_hash_update(&request->packet->src_port,
2128                                  sizeof(request->packet->src_port), hash);
2129                 start = hash % pool->num_home_servers;
2130                 break;
2131
2132         case HOME_POOL_KEYED_BALANCE:
2133                 if ((vp = pairfind(request->config_items, PW_LOAD_BALANCE_KEY, 0)) != NULL) {
2134                         hash = fr_hash(vp->vp_strvalue, vp->length);
2135                         start = hash % pool->num_home_servers;
2136                         break;
2137                 }
2138                 /* FALL-THROUGH */
2139
2140         case HOME_POOL_LOAD_BALANCE:
2141         case HOME_POOL_FAIL_OVER:
2142                 start = 0;
2143                 break;
2144
2145         default:                /* this shouldn't happen... */
2146                 start = 0;
2147                 break;
2148
2149         }
2150
2151         /*
2152          *      Starting with the home server we chose, loop through
2153          *      all home servers.  If the current one is dead, skip
2154          *      it.  If it is too busy, skip it.
2155          *
2156          *      Otherwise, use it.
2157          */
2158         for (count = 0; count < pool->num_home_servers; count++) {
2159                 home_server *home = pool->servers[(start + count) % pool->num_home_servers];
2160
2161                 if (!home) continue;
2162
2163                 /*
2164                  *      Skip dead home servers.
2165                  */
2166                 if (home->state == HOME_STATE_IS_DEAD) {
2167                         continue;
2168                 }
2169
2170                 /*
2171                  *      This home server is too busy.  Choose another one.
2172                  */
2173                 if (home->currently_outstanding >= home->max_outstanding) {
2174                         continue;
2175                 }
2176
2177 #ifdef WITH_DETAIL
2178                 /*
2179                  *      We read the packet from a detail file, AND it
2180                  *      came from this server.  Don't re-proxy it
2181                  *      there.
2182                  */
2183                 if ((request->listener->type == RAD_LISTEN_DETAIL) &&
2184                     (request->packet->code == PW_ACCOUNTING_REQUEST) &&
2185                     (fr_ipaddr_cmp(&home->ipaddr, &request->packet->src_ipaddr) == 0)) {
2186                         continue;
2187                 }
2188 #endif
2189
2190                 /*
2191                  *      Default virtual: ignore homes tied to a
2192                  *      virtual.
2193                  */
2194                 if (!request->server && home->parent_server) {
2195                         continue;
2196                 }
2197
2198                 /*
2199                  *      A virtual AND home is tied to virtual,
2200                  *      ignore ones which don't match.
2201                  */
2202                 if (request->server && home->parent_server &&
2203                     strcmp(request->server, home->parent_server) != 0) {
2204                         continue;
2205                 }
2206
2207                 /*
2208                  *      Allow request->server && !home->parent_server
2209                  *
2210                  *      i.e. virtuals can proxy to globally defined
2211                  *      homes.
2212                  */
2213
2214                 /*
2215                  *      It's zombie, so we remember the first zombie
2216                  *      we find, but we don't mark it as a "live"
2217                  *      server.
2218                  */
2219                 if (home->state == HOME_STATE_ZOMBIE) {
2220                         if (!zombie) zombie = home;
2221                         continue;
2222                 }
2223
2224                 /*
2225                  *      We've found the first "live" one.  Use that.
2226                  */
2227                 if (pool->type != HOME_POOL_LOAD_BALANCE) {
2228                         found = home;
2229                         break;
2230                 }
2231
2232                 /*
2233                  *      Otherwise we're doing some kind of load balancing.
2234                  *      If we haven't found one yet, pick this one.
2235                  */
2236                 if (!found) {
2237                         found = home;
2238                         continue;
2239                 }
2240
2241                 RDEBUG3("PROXY %s %d\t%s %d",
2242                        found->name, found->currently_outstanding,
2243                        home->name, home->currently_outstanding);
2244
2245                 /*
2246                  *      Prefer this server if it's less busy than the
2247                  *      one we had previously found.
2248                  */
2249                 if (home->currently_outstanding < found->currently_outstanding) {
2250                         RDEBUG3("PROXY Choosing %s: It's less busy than %s",
2251                                home->name, found->name);
2252                         found = home;
2253                         continue;
2254                 }
2255
2256                 /*
2257                  *      Ignore servers which are busier than the one
2258                  *      we found.
2259                  */
2260                 if (home->currently_outstanding > found->currently_outstanding) {
2261                         RDEBUG3("PROXY Skipping %s: It's busier than %s",
2262                                home->name, found->name);
2263                         continue;
2264                 }
2265
2266                 /*
2267                  *      From the list of servers which have the same
2268                  *      load, choose one at random.
2269                  */
2270                 if (((count + 1) * (fr_rand() & 0xffff)) < (uint32_t) 0x10000) {
2271                         found = home;
2272                 }
2273         } /* loop over the home servers */
2274
2275         /*
2276          *      We have no live servers, BUT we have a zombie.  Use
2277          *      the zombie as a last resort.
2278          */
2279         if (!found && zombie) {
2280                 found = zombie;
2281                 zombie = NULL;
2282         }
2283
2284         /*
2285          *      There's a fallback if they're all dead.
2286          */
2287         if (!found && pool->fallback) {
2288                 found = pool->fallback;
2289
2290                 DEBUG("WARNING: Home server pool %s failing over to fallback %s",
2291                       pool->name, found->server);
2292                 if (pool->in_fallback) goto update_and_return;
2293
2294                 pool->in_fallback = TRUE;
2295
2296                 /*
2297                  *      Run the trigger once an hour saying that
2298                  *      they're all dead.
2299                  */
2300                 if ((pool->time_all_dead + 3600) < request->timestamp) {
2301                         pool->time_all_dead = request->timestamp;
2302                         exec_trigger(request, pool->cs, "home_server_pool.fallback");
2303                 }
2304         }
2305
2306         if (found) {
2307         update_and_return:
2308                 if ((found != pool->fallback) && pool->in_fallback) {
2309                         pool->in_fallback = FALSE;
2310                         exec_trigger(request, pool->cs, "home_server_pool.normal");
2311                 }
2312
2313                 /*
2314                  *      Allocate the proxy packet, only if it wasn't
2315                  *      already allocated by a module.  This check is
2316                  *      mainly to support the proxying of EAP-TTLS and
2317                  *      EAP-PEAP tunneled requests.
2318                  *
2319                  *      In those cases, the EAP module creates a
2320                  *      "fake" request, and recursively passes it
2321                  *      through the authentication stage of the
2322                  *      server.  The module then checks if the request
2323                  *      was supposed to be proxied, and if so, creates
2324                  *      a proxy packet from the TUNNELED request, and
2325                  *      not from the EAP request outside of the
2326                  *      tunnel.
2327                  *
2328                  *      The proxy then works like normal, except that
2329                  *      the response packet is "eaten" by the EAP
2330                  *      module, and encapsulated into an EAP packet.
2331                  */
2332                 if (!request->proxy) {
2333                         if ((request->proxy = rad_alloc(TRUE)) == NULL) {
2334                                 radlog(L_ERR|L_CONS, "no memory");
2335                                 exit(1);
2336                         }
2337
2338                         /*
2339                          *      Copy the request, then look up name
2340                          *      and plain-text password in the copy.
2341                          *
2342                          *      Note that the User-Name attribute is
2343                          *      the *original* as sent over by the
2344                          *      client.  The Stripped-User-Name
2345                          *      attribute is the one hacked through
2346                          *      the 'hints' file.
2347                          */
2348                         request->proxy->vps =  paircopy(request->packet->vps);
2349                 }
2350
2351                 /*
2352                  *      Update the various fields as appropriate.
2353                  */
2354                 request->proxy->src_ipaddr = found->src_ipaddr;
2355                 request->proxy->src_port = 0;
2356                 request->proxy->dst_ipaddr = found->ipaddr;
2357                 request->proxy->dst_port = found->port;
2358                 request->home_server = found;
2359
2360                 /*
2361                  *      We're supposed to add a Message-Authenticator
2362                  *      if it doesn't exist, and it doesn't exist.
2363                  */
2364                 if (found->message_authenticator &&
2365                     (request->packet->code == PW_AUTHENTICATION_REQUEST) &&
2366                     !pairfind(request->proxy->vps, PW_MESSAGE_AUTHENTICATOR, 0)) {
2367                         radius_pairmake(request, &request->proxy->vps,
2368                                         "Message-Authenticator", "0x00",
2369                                         T_OP_SET);
2370                 }
2371
2372                 return found;
2373         }
2374
2375         /*
2376          *      No live match found, and no fallback to the "DEFAULT"
2377          *      realm.  We fix this by blindly marking all servers as
2378          *      "live".  But only do it for ones that don't support
2379          *      "pings", as they will be marked live when they
2380          *      actually are live.
2381          */
2382         if (!realm_config->fallback &&
2383             realm_config->wake_all_if_all_dead) {
2384                 for (count = 0; count < pool->num_home_servers; count++) {
2385                         home_server *home = pool->servers[count];
2386
2387                         if (!home) continue;
2388
2389                         if ((home->state == HOME_STATE_IS_DEAD) &&
2390                             (home->ping_check == HOME_PING_CHECK_NONE)) {
2391                                 home->state = HOME_STATE_ALIVE;
2392                                 if (!found) found = home;
2393                         }
2394                 }
2395
2396                 if (found) goto update_and_return;
2397         }
2398
2399         /*
2400          *      Still nothing.  Look up the DEFAULT realm, but only
2401          *      if we weren't looking up the NULL or DEFAULT realms.
2402          */
2403         if (realm_config->fallback &&
2404             realmname &&
2405             (strcmp(realmname, "NULL") != 0) &&
2406             (strcmp(realmname, "DEFAULT") != 0)) {
2407                 REALM *rd = realm_find("DEFAULT");
2408
2409                 if (!rd) return NULL;
2410
2411                 pool = NULL;
2412                 if (request->packet->code == PW_AUTHENTICATION_REQUEST) {
2413                         pool = rd->auth_pool;
2414
2415                 } else if (request->packet->code == PW_ACCOUNTING_REQUEST) {
2416                         pool = rd->acct_pool;
2417                 }
2418                 if (!pool) return NULL;
2419
2420                 RDEBUG2("PROXY - realm %s has no live home servers.  Falling back to the DEFAULT realm.", realmname);
2421                 return home_server_ldb(rd->name, pool, request);
2422         }
2423
2424         /*
2425          *      Still haven't found anything.  Oh well.
2426          */
2427         return NULL;
2428 }
2429
2430
2431 home_server *home_server_find(fr_ipaddr_t *ipaddr, int port, int proto)
2432 {
2433         home_server myhome;
2434
2435         memset(&myhome, 0, sizeof(myhome));
2436         myhome.ipaddr = *ipaddr;
2437         myhome.src_ipaddr.af = ipaddr->af;
2438         myhome.port = port;
2439 #ifdef WITH_TCP
2440         myhome.proto = proto;
2441 #else
2442         myhome.proto = IPPROTO_UDP;
2443 #endif
2444         myhome.server = NULL;   /* we're not called for internal proxying */
2445
2446         return rbtree_finddata(home_servers_byaddr, &myhome);
2447 }
2448
2449 #ifdef WITH_COA
2450 home_server *home_server_byname(const char *name, int type)
2451 {
2452         home_server myhome;
2453
2454         memset(&myhome, 0, sizeof(myhome));
2455         myhome.type = type;
2456         myhome.name = name;
2457
2458         return rbtree_finddata(home_servers_byname, &myhome);
2459 }
2460 #endif
2461
2462 #ifdef WITH_STATS
2463 home_server *home_server_bynumber(int number)
2464 {
2465         home_server myhome;
2466
2467         memset(&myhome, 0, sizeof(myhome));
2468         myhome.number = number;
2469         myhome.server = NULL;   /* we're not called for internal proxying */
2470
2471         return rbtree_finddata(home_servers_bynumber, &myhome);
2472 }
2473 #endif
2474
2475 home_pool_t *home_pool_byname(const char *name, int type)
2476 {
2477         home_pool_t mypool;
2478
2479         memset(&mypool, 0, sizeof(mypool));
2480         mypool.name = name;
2481         mypool.server_type = type;
2482         return rbtree_finddata(home_pools_byname, &mypool);
2483 }
2484
2485 #endif