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