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                                    "Server pool cannot include home server %s of 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         return 1;
 787 }
 788
 789
 790 static home_pool_t *server_pool_alloc(const char *name, home_pool_type_t type,
 791                                       int server_type, int num_home_servers)
 792 {
 793         home_pool_t *pool;
 794
 795         pool = rad_malloc(sizeof(*pool) + (sizeof(pool->servers[0]) *
 796                                            num_home_servers));
 797         if (!pool) return NULL; /* just for pairanoia */
 798
 799         memset(pool, 0, sizeof(*pool) + (sizeof(pool->servers[0]) *
 800                                          num_home_servers));
 801
 802         pool->name = name;
 803         pool->type = type;
 804         pool->server_type = server_type;
 805         pool->num_home_servers = num_home_servers;
 806
 807         return pool;
 808 }
 809
 810 static int pool_check_home_server(realm_config_t *rc, CONF_PAIR *cp,
 811                                   const char *name, int server_type,
 812                                   home_server **phome)
 813 {
 814         home_server myhome, *home;
 815         CONF_SECTION *server_cs;
 816
 817         if (!name) {
 818                 cf_log_err(cf_pairtoitem(cp),
 819                            "No value given for home_server.");
 820                 return 0;
 821         }
 822
 823         myhome.name = name;
 824         myhome.type = server_type;
 825         home = rbtree_finddata(home_servers_byname, &myhome);
 826         if (home) {
 827                 *phome = home;
 828                 return 1;
 829         }
 830
 831         server_cs = cf_section_sub_find_name2(rc->cs, "home_server", name);
 832         if (!server_cs) {
 833                 cf_log_err(cf_pairtoitem(cp),
 834                            "Unknown home_server \"%s\".", name);
 835                 return 0;
 836         }
 837
 838         if (!home_server_add(rc, server_cs, server_type)) {
 839                 return 0;
 840         }
 841
 842         home = rbtree_finddata(home_servers_byname, &myhome);
 843         if (!home) {
 844                 cf_log_err(cf_pairtoitem(cp),
 845                            "Internal error %d adding home server \"%s\".",
 846                            __LINE__, name);
 847                 return 0;
 848         }
 849
 850         *phome = home;
 851         return 1;
 852 }
 853
 854
 855 static int server_pool_add(realm_config_t *rc,
 856                            CONF_SECTION *cs, int server_type, int do_print)
 857 {
 858         const char *name2;
 859         home_pool_t *pool = NULL;
 860         const char *value;
 861         CONF_PAIR *cp;
 862         int num_home_servers;
 863         home_server *home;
 864
 865         name2 = cf_section_name1(cs);
 866         if (!name2 || ((strcasecmp(name2, "server_pool") != 0) &&
 867                        (strcasecmp(name2, "home_server_pool") != 0))) {
 868                 cf_log_err(cf_sectiontoitem(cs),
 869                            "Section is not a home_server_pool.");
 870                 return 0;
 871         }
 872
 873         name2 = cf_section_name2(cs);
 874         if (!name2) {
 875                 cf_log_err(cf_sectiontoitem(cs),
 876                            "Server pool section is missing a name.");
 877                 return 0;
 878         }
 879
 880         /*
 881          *      Count the home servers and initalize them.
 882          */
 883         num_home_servers = 0;
 884         for (cp = cf_pair_find(cs, "home_server");
 885              cp != NULL;
 886              cp = cf_pair_find_next(cs, cp, "home_server")) {
 887                 num_home_servers++;
 888
 889                 if (!pool_check_home_server(rc, cp, cf_pair_value(cp),
 890                                             server_type, &home)) {
 891                         return 0;
 892                 }
 893         }
 894
 895         if (num_home_servers == 0) {
 896                 cf_log_err(cf_sectiontoitem(cs),
 897                            "No home servers defined in pool %s",
 898                            name2);
 899                 goto error;
 900         }
 901
 902         pool = server_pool_alloc(name2, HOME_POOL_FAIL_OVER, server_type,
 903                                  num_home_servers);
 904         pool->cs = cs;
 905
 906
 907         /*
 908          *      Fallback servers must be defined, and must be
 909          *      virtual servers.
 910          */
 911         cp = cf_pair_find(cs, "fallback");
 912         if (cp) {
 913 #ifdef WITH_COA
 914                 if (server_type == HOME_TYPE_COA) {
 915                         cf_log_err(cf_sectiontoitem(cs), "Home server pools of type \"coa\" cannot have a fallback virtual server.");
 916                         goto error;
 917                 }
 918 #endif
 919
 920                 if (!pool_check_home_server(rc, cp, cf_pair_value(cp),
 921                                             server_type, &pool->fallback)) {
 922
 923                         goto error;
 924                 }
 925
 926                 if (!pool->fallback->server) {
 927                         cf_log_err(cf_sectiontoitem(cs), "Fallback home_server %s does NOT contain a virtual_server directive.", pool->fallback->name);
 928                         goto error;
 929                 }
 930         }
 931
 932         if (do_print) cf_log_info(cs, " home_server_pool %s {", name2);
 933
 934         cp = cf_pair_find(cs, "type");
 935         if (cp) {
 936                 static FR_NAME_NUMBER pool_types[] = {
 937                         { "load-balance", HOME_POOL_LOAD_BALANCE },
 938                         { "fail-over", HOME_POOL_FAIL_OVER },
 939                         { "round_robin", HOME_POOL_LOAD_BALANCE },
 940                         { "fail_over", HOME_POOL_FAIL_OVER },
 941                         { "client-balance", HOME_POOL_CLIENT_BALANCE },
 942                         { "client-port-balance", HOME_POOL_CLIENT_PORT_BALANCE },
 943                         { "keyed-balance", HOME_POOL_KEYED_BALANCE },
 944                         { NULL, 0 }
 945                 };
 946
 947                 value = cf_pair_value(cp);
 948                 if (!value) {
 949                         cf_log_err(cf_pairtoitem(cp),
 950                                    "No value given for type.");
 951                         goto error;
 952                 }
 953
 954                 pool->type = fr_str2int(pool_types, value, 0);
 955                 if (!pool->type) {
 956                         cf_log_err(cf_pairtoitem(cp),
 957                                    "Unknown type \"%s\".",
 958                                    value);
 959                         goto error;
 960                 }
 961
 962                 if (do_print) cf_log_info(cs, "\ttype = %s", value);
 963         }
 964
 965         cp = cf_pair_find(cs, "virtual_server");
 966         if (cp) {
 967                 pool->virtual_server = cf_pair_value(cp);
 968                 if (!pool->virtual_server) {
 969                         cf_log_err(cf_pairtoitem(cp), "No value given for virtual_server");
 970                         goto error;
 971                 }
 972
 973                 if (do_print) {
 974                         cf_log_info(cs, "\tvirtual_server = %s", pool->virtual_server);
 975                 }
 976
 977                 if (!cf_section_sub_find_name2(rc->cs, "server",
 978                                                pool->virtual_server)) {
 979                         cf_log_err(cf_pairtoitem(cp), "No such server %s",
 980                                    pool->virtual_server);
 981                         goto error;
 982                 }
 983
 984         }
 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                 home_server myhome;
 991
 992                 value = cf_pair_value(cp);
 993
 994                 memset(&myhome, 0, sizeof(&myhome));
 995                 myhome.name = value;
 996                 myhome.type = server_type;
 997
 998                 home = rbtree_finddata(home_servers_byname, &myhome);
 999                 if (!home) {
1000                         DEBUG2("Internal sanity check failed");
1001                         goto error;
1002                 }
1003
1004                 if (0) {
1005                         DEBUG2("Warning: Duplicate home server %s in server pool %s", home->name, pool->name);
1006                         continue;
1007                 }
1008
1009                 if (do_print) cf_log_info(cs, "\thome_server = %s", home->name);
1010                 pool->servers[num_home_servers++] = home;
1011         } /* loop over home_server's */
1012
1013         if (pool->fallback && do_print) {
1014                 cf_log_info(cs, "\tfallback = %s", pool->fallback->name);
1015         }
1016
1017         if (!rbtree_insert(home_pools_byname, pool)) {
1018                 rad_assert("Internal sanity check failed");
1019                 goto error;
1020         }
1021
1022         if (do_print) cf_log_info(cs, " }");
1023
1024         cf_data_add(cs, "home_server_pool", pool, free);
1025
1026         rad_assert(pool->server_type != 0);
1027
1028         return 1;
1029
1030  error:
1031         if (do_print) cf_log_info(cs, " }");
1032         free(pool);
1033         return 0;
1034 }
1035 #endif
1036
1037 static int old_server_add(realm_config_t *rc, CONF_SECTION *cs,
1038                           const char *realm,
1039                           const char *name, const char *secret,
1040                           home_pool_type_t ldflag, home_pool_t **pool_p,
1041                           int type, const char *server)
1042 {
1043 #ifdef WITH_PROXY
1044         int i, insert_point, num_home_servers;
1045         home_server myhome, *home;
1046         home_pool_t mypool, *pool;
1047         CONF_SECTION *subcs;
1048 #else
1049         rc = rc;                /* -Wunused */
1050         realm = realm;
1051         secret = secret;
1052         ldflag = ldflag;
1053         type = type;
1054         server = server;
1055 #endif
1056
1057         /*
1058          *      LOCAL realms get sanity checked, and nothing else happens.
1059          */
1060         if (strcmp(name, "LOCAL") == 0) {
1061                 if (*pool_p) {
1062                         cf_log_err(cf_sectiontoitem(cs), "Realm \"%s\" cannot be both LOCAL and remote", name);
1063                         return 0;
1064                 }
1065                 return 1;
1066         }
1067
1068 #ifndef WITH_PROXY
1069         return 0;               /* Not proxying.  Can't do non-LOCAL realms */
1070
1071 #else
1072         mypool.name = realm;
1073         mypool.server_type = type;
1074         pool = rbtree_finddata(home_pools_byname, &mypool);
1075         if (pool) {
1076                 if (pool->type != ldflag) {
1077                         cf_log_err(cf_sectiontoitem(cs), "Inconsistent ldflag for server pool \"%s\"", name);
1078                         return 0;
1079                 }
1080
1081                 if (pool->server_type != type) {
1082                         cf_log_err(cf_sectiontoitem(cs), "Inconsistent home server type for server pool \"%s\"", name);
1083                         return 0;
1084                 }
1085         }
1086
1087         myhome.name = name;
1088         myhome.type = type;
1089         home = rbtree_finddata(home_servers_byname, &myhome);
1090         if (home) {
1091                 if (secret && (strcmp(home->secret, secret) != 0)) {
1092                         cf_log_err(cf_sectiontoitem(cs), "Inconsistent shared secret for home server \"%s\"", name);
1093                         return 0;
1094                 }
1095
1096                 if (home->type != type) {
1097                         cf_log_err(cf_sectiontoitem(cs), "Inconsistent type for home server \"%s\"", name);
1098                         return 0;
1099                 }
1100
1101                 /*
1102                  *      See if the home server is already listed
1103                  *      in the pool.  If so, do nothing else.
1104                  */
1105                 if (pool) for (i = 0; i < pool->num_home_servers; i++) {
1106                         if (pool->servers[i] == home) {
1107                                 return 1;
1108                         }
1109                 }
1110         }
1111
1112         /*
1113          *      If we do have a pool, check that there is room to
1114          *      insert the home server we've found, or the one that we
1115          *      create here.
1116          *
1117          *      Note that we insert it into the LAST available
1118          *      position, in order to maintain the same order as in
1119          *      the configuration files.
1120          */
1121         insert_point = -1;
1122         if (pool) {
1123                 for (i = pool->num_home_servers - 1; i >= 0; i--) {
1124                         if (pool->servers[i]) break;
1125
1126                         if (!pool->servers[i]) {
1127                                 insert_point = i;
1128                         }
1129                 }
1130
1131                 if (insert_point < 0) {
1132                         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);
1133                         return 0;
1134                 }
1135         }
1136
1137         /*
1138          *      No home server, allocate one.
1139          */
1140         if (!home) {
1141                 const char *p;
1142                 char *q;
1143
1144                 home = rad_malloc(sizeof(*home));
1145                 memset(home, 0, sizeof(*home));
1146
1147                 home->name = name;
1148                 home->hostname = name;
1149                 home->type = type;
1150                 home->secret = secret;
1151                 home->cs = cs;
1152                 home->proto = IPPROTO_UDP;
1153
1154                 p = strchr(name, ':');
1155                 if (!p) {
1156                         if (type == HOME_TYPE_AUTH) {
1157                                 home->port = PW_AUTH_UDP_PORT;
1158                         } else {
1159                                 home->port = PW_ACCT_UDP_PORT;
1160                         }
1161
1162                         p = name;
1163                         q = NULL;
1164
1165                 } else if (p == name) {
1166                                 cf_log_err(cf_sectiontoitem(cs),
1167                                            "Invalid hostname %s.",
1168                                            name);
1169                                 free(home);
1170                                 return 0;
1171
1172                 } else {
1173                         home->port = atoi(p + 1);
1174                         if ((home->port == 0) || (home->port > 65535)) {
1175                                 cf_log_err(cf_sectiontoitem(cs),
1176                                            "Invalid port %s.",
1177                                            p + 1);
1178                                 free(home);
1179                                 return 0;
1180                         }
1181
1182                         q = rad_malloc((p - name) + 1);
1183                         memcpy(q, name, (p - name));
1184                         q[p - name] = '\0';
1185                         p = q;
1186                 }
1187
1188                 if (!server) {
1189                         if (ip_hton(p, AF_UNSPEC, &home->ipaddr) < 0) {
1190                                 cf_log_err(cf_sectiontoitem(cs),
1191                                            "Failed looking up hostname %s.",
1192                                            p);
1193                                 free(home);
1194                                 free(q);
1195                                 return 0;
1196                         }
1197                         home->src_ipaddr.af = home->ipaddr.af;
1198                 } else {
1199                         home->ipaddr.af = AF_UNSPEC;
1200                         home->server = server;
1201                 }
1202                 free(q);
1203
1204                 /*
1205                  *      Use the old-style configuration.
1206                  */
1207                 home->max_outstanding = 65535*16;
1208                 home->zombie_period = rc->retry_delay * rc->retry_count;
1209                 if (home->zombie_period == 0) home->zombie_period =30;
1210                 home->response_window = home->zombie_period - 1;
1211
1212                 home->ping_check = HOME_PING_CHECK_NONE;
1213
1214                 home->revive_interval = rc->dead_time;
1215
1216                 if (rbtree_finddata(home_servers_byaddr, home)) {
1217                         cf_log_err(cf_sectiontoitem(cs), "Home server %s has the same IP address and/or port as another home server.", name);
1218                         free(home);
1219                         return 0;
1220                 }
1221
1222                 if (!rbtree_insert(home_servers_byname, home)) {
1223                         cf_log_err(cf_sectiontoitem(cs), "Internal error %d adding home server %s.", __LINE__, name);
1224                         free(home);
1225                         return 0;
1226                 }
1227
1228                 if (!rbtree_insert(home_servers_byaddr, home)) {
1229                         rbtree_deletebydata(home_servers_byname, home);
1230                         cf_log_err(cf_sectiontoitem(cs), "Internal error %d adding home server %s.", __LINE__, name);
1231                         free(home);
1232                         return 0;
1233                 }
1234
1235 #ifdef WITH_STATS
1236                 home->number = home_server_max_number++;
1237                 if (!rbtree_insert(home_servers_bynumber, home)) {
1238                         rbtree_deletebydata(home_servers_byname, home);
1239                         if (home->ipaddr.af != AF_UNSPEC) {
1240                                 rbtree_deletebydata(home_servers_byname, home);
1241                         }
1242                         cf_log_err(cf_sectiontoitem(cs),
1243                                    "Internal error %d adding home server %s.",
1244                                    __LINE__, name);
1245                         free(home);
1246                         return 0;
1247                 }
1248 #endif
1249         }
1250
1251         /*
1252          *      We now have a home server, see if we can insert it
1253          *      into pre-existing pool.
1254          */
1255         if (insert_point >= 0) {
1256                 rad_assert(pool != NULL);
1257                 pool->servers[insert_point] = home;
1258                 return 1;
1259         }
1260
1261         rad_assert(pool == NULL);
1262         rad_assert(home != NULL);
1263
1264         /*
1265          *      Count the old-style realms of this name.
1266          */
1267         num_home_servers = 0;
1268         for (subcs = cf_section_find_next(cs, NULL, "realm");
1269              subcs != NULL;
1270              subcs = cf_section_find_next(cs, subcs, "realm")) {
1271                 const char *this = cf_section_name2(subcs);
1272
1273                 if (!this || (strcmp(this, realm) != 0)) continue;
1274                 num_home_servers++;
1275         }
1276
1277         if (num_home_servers == 0) {
1278                 cf_log_err(cf_sectiontoitem(cs), "Internal error counting pools for home server %s.", name);
1279                 free(home);
1280                 return 0;
1281         }
1282
1283         pool = server_pool_alloc(realm, ldflag, type, num_home_servers);
1284         pool->cs = cs;
1285
1286         pool->servers[0] = home;
1287
1288         if (!rbtree_insert(home_pools_byname, pool)) {
1289                 rad_assert("Internal sanity check failed");
1290                 return 0;
1291         }
1292
1293         *pool_p = pool;
1294
1295         return 1;
1296 #endif
1297 }
1298
1299 static int old_realm_config(realm_config_t *rc, CONF_SECTION *cs, REALM *r)
1300 {
1301         const char *host;
1302         const char *secret = NULL;
1303         home_pool_type_t ldflag;
1304         CONF_PAIR *cp;
1305
1306         cp = cf_pair_find(cs, "ldflag");
1307         ldflag = HOME_POOL_FAIL_OVER;
1308         if (cp) {
1309                 host = cf_pair_value(cp);
1310                 if (!host) {
1311                         cf_log_err(cf_pairtoitem(cp), "No value specified for ldflag");
1312                         return 0;
1313                 }
1314
1315                 if (strcasecmp(host, "fail_over") == 0) {
1316                         cf_log_info(cs, "\tldflag = fail_over");
1317
1318                 } else if (strcasecmp(host, "round_robin") == 0) {
1319                         ldflag = HOME_POOL_LOAD_BALANCE;
1320                         cf_log_info(cs, "\tldflag = round_robin");
1321
1322                 } else {
1323                         cf_log_err(cf_sectiontoitem(cs), "Unknown value \"%s\" for ldflag", host);
1324                         return 0;
1325                 }
1326         } /* else don't print it. */
1327
1328         /*
1329          *      Allow old-style if it doesn't exist, or if it exists and
1330          *      it's LOCAL.
1331          */
1332         cp = cf_pair_find(cs, "authhost");
1333         if (cp) {
1334                 host = cf_pair_value(cp);
1335                 if (!host) {
1336                         cf_log_err(cf_pairtoitem(cp), "No value specified for authhost");
1337                         return 0;
1338                 }
1339
1340                 if (strcmp(host, "LOCAL") != 0) {
1341                         cp = cf_pair_find(cs, "secret");
1342                         if (!cp) {
1343                                 cf_log_err(cf_sectiontoitem(cs), "No shared secret supplied for realm: %s", r->name);
1344                                 return 0;
1345                         }
1346
1347                         secret = cf_pair_value(cp);
1348                         if (!secret) {
1349                                 cf_log_err(cf_pairtoitem(cp), "No value specified for secret");
1350                                 return 0;
1351                         }
1352                 }
1353
1354                 cf_log_info(cs, "\tauthhost = %s",  host);
1355
1356                 if (!old_server_add(rc, cs, r->name, host, secret, ldflag,
1357                                     &r->auth_pool, HOME_TYPE_AUTH, NULL)) {
1358                         return 0;
1359                 }
1360         }
1361
1362         cp = cf_pair_find(cs, "accthost");
1363         if (cp) {
1364                 host = cf_pair_value(cp);
1365                 if (!host) {
1366                         cf_log_err(cf_pairtoitem(cp), "No value specified for accthost");
1367                         return 0;
1368                 }
1369
1370                 /*
1371                  *      Don't look for a secret again if it was found
1372                  *      above.
1373                  */
1374                 if ((strcmp(host, "LOCAL") != 0) && !secret) {
1375                         cp = cf_pair_find(cs, "secret");
1376                         if (!cp) {
1377                                 cf_log_err(cf_sectiontoitem(cs), "No shared secret supplied for realm: %s", r->name);
1378                                 return 0;
1379                         }
1380
1381                         secret = cf_pair_value(cp);
1382                         if (!secret) {
1383                                 cf_log_err(cf_pairtoitem(cp), "No value specified for secret");
1384                                 return 0;
1385                         }
1386                 }
1387
1388                 cf_log_info(cs, "\taccthost = %s", host);
1389
1390                 if (!old_server_add(rc, cs, r->name, host, secret, ldflag,
1391                                     &r->acct_pool, HOME_TYPE_ACCT, NULL)) {
1392                         return 0;
1393                 }
1394         }
1395
1396         cp = cf_pair_find(cs, "virtual_server");
1397         if (cp) {
1398                 host = cf_pair_value(cp);
1399                 if (!host) {
1400                         cf_log_err(cf_pairtoitem(cp), "No value specified for virtual_server");
1401                         return 0;
1402                 }
1403
1404                 cf_log_info(cs, "\tvirtual_server = %s", host);
1405
1406                 if (!old_server_add(rc, cs, r->name, host, "", ldflag,
1407                                     &r->auth_pool, HOME_TYPE_AUTH, host)) {
1408                         return 0;
1409                 }
1410                 if (!old_server_add(rc, cs, r->name, host, "", ldflag,
1411                                     &r->acct_pool, HOME_TYPE_ACCT, host)) {
1412                         return 0;
1413                 }
1414         }
1415
1416         if (secret) cf_log_info(cs, "\tsecret = %s", secret);
1417
1418         return 1;
1419
1420 }
1421
1422
1423 #ifdef WITH_PROXY
1424 static int add_pool_to_realm(realm_config_t *rc, CONF_SECTION *cs,
1425                              const char *name, home_pool_t **dest,
1426                              int server_type, int do_print)
1427 {
1428         home_pool_t mypool, *pool;
1429
1430         mypool.name = name;
1431         mypool.server_type = server_type;
1432
1433         pool = rbtree_finddata(home_pools_byname, &mypool);
1434         if (!pool) {
1435                 CONF_SECTION *pool_cs;
1436
1437                 pool_cs = cf_section_sub_find_name2(rc->cs,
1438                                                     "home_server_pool",
1439                                                     name);
1440                 if (!pool_cs) {
1441                         pool_cs = cf_section_sub_find_name2(rc->cs,
1442                                                             "server_pool",
1443                                                             name);
1444                 }
1445                 if (!pool_cs) {
1446                         cf_log_err(cf_sectiontoitem(cs), "Failed to find home_server_pool \"%s\"", name);
1447                         return 0;
1448                 }
1449
1450                 if (!server_pool_add(rc, pool_cs, server_type, do_print)) {
1451                         return 0;
1452                 }
1453
1454                 pool = rbtree_finddata(home_pools_byname, &mypool);
1455                 if (!pool) {
1456                         radlog(L_ERR, "Internal sanity check failed in add_pool_to_realm");
1457                         return 0;
1458                 }
1459         }
1460
1461         if (pool->server_type != server_type) {
1462                 cf_log_err(cf_sectiontoitem(cs), "Incompatible home_server_pool \"%s\" (mixed auth_pool / acct_pool)", name);
1463                 return 0;
1464         }
1465
1466         *dest = pool;
1467
1468         return 1;
1469 }
1470 #endif
1471
1472
1473 static int realm_add(realm_config_t *rc, CONF_SECTION *cs)
1474 {
1475         const char *name2;
1476         REALM *r = NULL;
1477         CONF_PAIR *cp;
1478 #ifdef WITH_PROXY
1479         home_pool_t *auth_pool, *acct_pool;
1480         const char *auth_pool_name, *acct_pool_name;
1481 #endif
1482
1483         name2 = cf_section_name1(cs);
1484         if (!name2 || (strcasecmp(name2, "realm") != 0)) {
1485                 cf_log_err(cf_sectiontoitem(cs), "Section is not a realm.");
1486                 return 0;
1487         }
1488
1489         name2 = cf_section_name2(cs);
1490         if (!name2) {
1491                 cf_log_err(cf_sectiontoitem(cs), "Realm section is missing the realm name.");
1492                 return 0;
1493         }
1494
1495 #ifdef WITH_PROXY
1496         auth_pool = acct_pool = NULL;
1497         auth_pool_name = acct_pool_name = NULL;
1498
1499         /*
1500          *      Prefer new configuration to old one.
1501          */
1502         cp = cf_pair_find(cs, "pool");
1503         if (!cp) cp = cf_pair_find(cs, "home_server_pool");
1504         if (cp) auth_pool_name = cf_pair_value(cp);
1505         if (cp && auth_pool_name) {
1506                 acct_pool_name = auth_pool_name;
1507                 if (!add_pool_to_realm(rc, cs,
1508                                        auth_pool_name, &auth_pool,
1509                                        HOME_TYPE_AUTH, 1)) {
1510                         return 0;
1511                 }
1512                 if (!add_pool_to_realm(rc, cs,
1513                                        auth_pool_name, &acct_pool,
1514                                        HOME_TYPE_ACCT, 0)) {
1515                         return 0;
1516                 }
1517         }
1518
1519         cp = cf_pair_find(cs, "auth_pool");
1520         if (cp) auth_pool_name = cf_pair_value(cp);
1521         if (cp && auth_pool_name) {
1522                 if (auth_pool) {
1523                         cf_log_err(cf_sectiontoitem(cs), "Cannot use \"pool\" and \"auth_pool\" at the same time.");
1524                         return 0;
1525                 }
1526                 if (!add_pool_to_realm(rc, cs,
1527                                        auth_pool_name, &auth_pool,
1528                                        HOME_TYPE_AUTH, 1)) {
1529                         return 0;
1530                 }
1531         }
1532
1533         cp = cf_pair_find(cs, "acct_pool");
1534         if (cp) acct_pool_name = cf_pair_value(cp);
1535         if (cp && acct_pool_name) {
1536                 int do_print = TRUE;
1537
1538                 if (acct_pool) {
1539                         cf_log_err(cf_sectiontoitem(cs), "Cannot use \"pool\" and \"acct_pool\" at the same time.");
1540                         return 0;
1541                 }
1542
1543                 if (!auth_pool ||
1544                     (strcmp(auth_pool_name, acct_pool_name) != 0)) {
1545                         do_print = TRUE;
1546                 }
1547
1548                 if (!add_pool_to_realm(rc, cs,
1549                                        acct_pool_name, &acct_pool,
1550                                        HOME_TYPE_ACCT, do_print)) {
1551                         return 0;
1552                 }
1553         }
1554 #endif
1555
1556         cf_log_info(cs, " realm %s {", name2);
1557
1558 #ifdef WITH_PROXY
1559         /*
1560          *      The realm MAY already exist if it's an old-style realm.
1561          *      In that case, merge the old-style realm with this one.
1562          */
1563         r = realm_find2(name2);
1564         if (r && (strcmp(r->name, name2) == 0)) {
1565                 if (cf_pair_find(cs, "auth_pool") ||
1566                     cf_pair_find(cs, "acct_pool")) {
1567                         cf_log_err(cf_sectiontoitem(cs), "Duplicate realm \"%s\"", name2);
1568                         goto error;
1569                 }
1570
1571                 if (!old_realm_config(rc, cs, r)) {
1572                         goto error;
1573                 }
1574
1575                 cf_log_info(cs, " } # realm %s", name2);
1576                 return 1;
1577         }
1578 #endif
1579
1580 #ifdef HAVE_REGEX_H
1581         if (name2[0] == '~') {
1582                 int rcode;
1583                 regex_t reg;
1584
1585                 /*
1586                  *      Include substring matches.
1587                  */
1588                 rcode = regcomp(&reg, name2 + 1,
1589                                 REG_EXTENDED | REG_NOSUB | REG_ICASE);
1590                 if (rcode != 0) {
1591                         char buffer[256];
1592
1593                         regerror(rcode, &reg, buffer, sizeof(buffer));
1594
1595                         cf_log_err(cf_sectiontoitem(cs),
1596                                    "Invalid regex \"%s\": %s",
1597                                    name2 + 1, buffer);
1598                         goto error;
1599                 }
1600                 regfree(&reg);
1601         }
1602 #endif
1603
1604         r = rad_malloc(sizeof(*r));
1605         memset(r, 0, sizeof(*r));
1606
1607         r->name = name2;
1608         r->striprealm = 1;
1609 #ifdef WITH_PROXY
1610         r->auth_pool = auth_pool;
1611         r->acct_pool = acct_pool;
1612
1613         if (auth_pool_name &&
1614             (auth_pool_name == acct_pool_name)) { /* yes, ptr comparison */
1615                 cf_log_info(cs, "\tpool = %s", auth_pool_name);
1616         } else {
1617                 if (auth_pool_name) cf_log_info(cs, "\tauth_pool = %s", auth_pool_name);
1618                 if (acct_pool_name) cf_log_info(cs, "\tacct_pool = %s", acct_pool_name);
1619         }
1620 #endif
1621
1622         cp = cf_pair_find(cs, "nostrip");
1623         if (cp && (cf_pair_value(cp) == NULL)) {
1624                 r->striprealm = 0;
1625                 cf_log_info(cs, "\tnostrip");
1626         }
1627
1628         /*
1629          *      We're a new-style realm.  Complain if we see the old
1630          *      directives.
1631          */
1632         if (r->auth_pool || r->acct_pool) {
1633                 if (((cp = cf_pair_find(cs, "authhost")) != NULL) ||
1634                     ((cp = cf_pair_find(cs, "accthost")) != NULL) ||
1635                     ((cp = cf_pair_find(cs, "secret")) != NULL) ||
1636                     ((cp = cf_pair_find(cs, "ldflag")) != NULL)) {
1637                         DEBUG2("WARNING: Ignoring old-style configuration entry \"%s\" in realm \"%s\"", cf_pair_attr(cp), r->name);
1638                 }
1639
1640
1641                 /*
1642                  *      The realm MAY be an old-style realm, as there
1643                  *      was no auth_pool or acct_pool.  Double-check
1644                  *      it, just to be safe.
1645                  */
1646         } else if (!old_realm_config(rc, cs, r)) {
1647                 goto error;
1648         }
1649
1650 #ifdef HAVE_REGEX_H
1651         /*
1652          *      It's a regex.  Add it to a separate list.
1653          */
1654         if (name2[0] == '~') {
1655                 realm_regex_t *rr, **last;
1656
1657                 rr = rad_malloc(sizeof(*rr));
1658
1659                 last = &realms_regex;
1660                 while (*last) last = &((*last)->next);  /* O(N^2)... sue me. */
1661
1662                 r->name = name2;
1663                 rr->realm = r;
1664                 rr->next = NULL;
1665
1666                 *last = rr;
1667
1668                 cf_log_info(cs, " }");
1669                 return 1;
1670         }
1671 #endif
1672
1673         if (!rbtree_insert(realms_byname, r)) {
1674                 rad_assert("Internal sanity check failed");
1675                 goto error;
1676         }
1677
1678         cf_log_info(cs, " }");
1679
1680         return 1;
1681
1682  error:
1683         cf_log_info(cs, " } # realm %s", name2);
1684         free(r);
1685         return 0;
1686 }
1687
1688 #ifdef WITH_COA
1689 static const FR_NAME_NUMBER home_server_types[] = {
1690         { "auth", HOME_TYPE_AUTH },
1691         { "auth+acct", HOME_TYPE_AUTH },
1692         { "acct", HOME_TYPE_ACCT },
1693         { "coa", HOME_TYPE_COA },
1694         { NULL, 0 }
1695 };
1696
1697 static int pool_peek_type(CONF_SECTION *config, CONF_SECTION *cs)
1698 {
1699         int home;
1700         const char *name, *type;
1701         CONF_PAIR *cp;
1702         CONF_SECTION *server_cs;
1703
1704         cp = cf_pair_find(cs, "home_server");
1705         if (!cp) {
1706                 cf_log_err(cf_sectiontoitem(cs), "Pool does not contain a \"home_server\" entry");
1707                 return HOME_TYPE_INVALID;
1708         }
1709
1710         name = cf_pair_value(cp);
1711         if (!name) {
1712                 cf_log_err(cf_pairtoitem(cp), "home_server entry does not reference a home server");
1713                 return HOME_TYPE_INVALID;
1714         }
1715
1716         server_cs = cf_section_sub_find_name2(config, "home_server", name);
1717         if (!server_cs) {
1718                 cf_log_err(cf_pairtoitem(cp), "home_server \"%s\" does not exist", name);
1719                 return HOME_TYPE_INVALID;
1720         }
1721
1722         cp = cf_pair_find(server_cs, "type");
1723         if (!cp) {
1724                 cf_log_err(cf_sectiontoitem(server_cs), "home_server %s does not contain a \"type\" entry", name);
1725                 return HOME_TYPE_INVALID;
1726         }
1727
1728         type = cf_pair_value(cp);
1729         if (!type) {
1730                 cf_log_err(cf_sectiontoitem(server_cs), "home_server %s contains an empty \"type\" entry", name);
1731                 return HOME_TYPE_INVALID;
1732         }
1733
1734         home = fr_str2int(home_server_types, type, HOME_TYPE_INVALID);
1735         if (home == HOME_TYPE_INVALID) {
1736                 cf_log_err(cf_sectiontoitem(server_cs), "home_server %s contains an invalid \"type\" entry of value \"%s\"", name, type);
1737                 return HOME_TYPE_INVALID;
1738         }
1739
1740         return home;            /* 'cause we miss it so much */
1741 }
1742 #endif
1743
1744 int realms_init(CONF_SECTION *config)
1745 {
1746         CONF_SECTION *cs;
1747         realm_config_t *rc, *old_rc;
1748
1749         if (realms_byname) return 1;
1750
1751         realms_byname = rbtree_create(realm_name_cmp, free, 0);
1752         if (!realms_byname) {
1753                 realms_free();
1754                 return 0;
1755         }
1756
1757 #ifdef WITH_PROXY
1758         home_servers_byaddr = rbtree_create(home_server_addr_cmp, free, 0);
1759         if (!home_servers_byaddr) {
1760                 realms_free();
1761                 return 0;
1762         }
1763
1764         home_servers_byname = rbtree_create(home_server_name_cmp, NULL, 0);
1765         if (!home_servers_byname) {
1766                 realms_free();
1767                 return 0;
1768         }
1769
1770 #ifdef WITH_STATS
1771         home_servers_bynumber = rbtree_create(home_server_number_cmp, NULL, 0);
1772         if (!home_servers_bynumber) {
1773                 realms_free();
1774                 return 0;
1775         }
1776 #endif
1777
1778         home_pools_byname = rbtree_create(home_pool_name_cmp, NULL, 0);
1779         if (!home_pools_byname) {
1780                 realms_free();
1781                 return 0;
1782         }
1783 #endif
1784
1785         rc = rad_malloc(sizeof(*rc));
1786         memset(rc, 0, sizeof(*rc));
1787         rc->cs = config;
1788
1789 #ifdef WITH_PROXY
1790         cs = cf_subsection_find_next(config, NULL, "proxy");
1791         if (cs) {
1792                 cf_section_parse(cs, rc, proxy_config);
1793         } else {
1794                 rc->dead_time = DEAD_TIME;
1795                 rc->retry_count = RETRY_COUNT;
1796                 rc->retry_delay = RETRY_DELAY;
1797                 rc->fallback = 0;
1798                 rc->wake_all_if_all_dead= 0;
1799         }
1800 #endif
1801
1802         for (cs = cf_subsection_find_next(config, NULL, "realm");
1803              cs != NULL;
1804              cs = cf_subsection_find_next(config, cs, "realm")) {
1805                 if (!realm_add(rc, cs)) {
1806                         free(rc);
1807                         realms_free();
1808                         return 0;
1809                 }
1810         }
1811
1812 #ifdef WITH_COA
1813         /*
1814          *      CoA pools aren't tied to realms.
1815          */
1816         for (cs = cf_subsection_find_next(config, NULL, "home_server_pool");
1817              cs != NULL;
1818              cs = cf_subsection_find_next(config, cs, "home_server_pool")) {
1819                 int type;
1820
1821                 /*
1822                  *      Pool was already loaded.
1823                  */
1824                 if (cf_data_find(cs, "home_server_pool")) continue;
1825
1826                 type = pool_peek_type(config, cs);
1827                 if (type == HOME_TYPE_INVALID) return 0;
1828
1829                 if (!server_pool_add(rc, cs, type, TRUE)) {
1830                         return 0;
1831                 }
1832         }
1833 #endif
1834
1835
1836 #ifdef WITH_PROXY
1837         xlat_register("home_server", xlat_home_server, NULL);
1838         xlat_register("home_server_pool", xlat_server_pool, NULL);
1839 #endif
1840
1841         /*
1842          *      Swap pointers atomically.
1843          */
1844         old_rc = realm_config;
1845         realm_config = rc;
1846         free(old_rc);
1847
1848         return 1;
1849 }
1850
1851 /*
1852  *      Find a realm where "name" might be the regex.
1853  */
1854 REALM *realm_find2(const char *name)
1855 {
1856         REALM myrealm;
1857         REALM *realm;
1858
1859         if (!name) name = "NULL";
1860
1861         myrealm.name = name;
1862         realm = rbtree_finddata(realms_byname, &myrealm);
1863         if (realm) return realm;
1864
1865 #ifdef HAVE_REGEX_H
1866         if (realms_regex) {
1867                 realm_regex_t *this;
1868
1869                 for (this = realms_regex; this != NULL; this = this->next) {
1870                         if (strcmp(this->realm->name, name) == 0) {
1871                                 return this->realm;
1872                         }
1873                 }
1874         }
1875 #endif
1876
1877         /*
1878          *      Couldn't find a realm.  Look for DEFAULT.
1879          */
1880         myrealm.name = "DEFAULT";
1881         return rbtree_finddata(realms_byname, &myrealm);
1882 }
1883
1884
1885 /*
1886  *      Find a realm in the REALM list.
1887  */
1888 REALM *realm_find(const char *name)
1889 {
1890         REALM myrealm;
1891         REALM *realm;
1892
1893         if (!name) name = "NULL";
1894
1895         myrealm.name = name;
1896         realm = rbtree_finddata(realms_byname, &myrealm);
1897         if (realm) return realm;
1898
1899 #ifdef HAVE_REGEX_H
1900         if (realms_regex) {
1901                 realm_regex_t *this;
1902
1903                 for (this = realms_regex; this != NULL; this = this->next) {
1904                         int compare;
1905                         regex_t reg;
1906
1907                         /*
1908                          *      Include substring matches.
1909                          */
1910                         if (regcomp(&reg, this->realm->name + 1,
1911                                     REG_EXTENDED | REG_NOSUB | REG_ICASE) != 0) {
1912                                 continue;
1913                         }
1914
1915                         compare = regexec(&reg, name, 0, NULL, 0);
1916                         regfree(&reg);
1917
1918                         if (compare == 0) return this->realm;
1919                 }
1920         }
1921 #endif
1922
1923         /*
1924          *      Couldn't find a realm.  Look for DEFAULT.
1925          */
1926         myrealm.name = "DEFAULT";
1927         return rbtree_finddata(realms_byname, &myrealm);
1928 }
1929
1930
1931 #ifdef WITH_PROXY
1932 home_server *home_server_ldb(const char *realmname,
1933                              home_pool_t *pool, REQUEST *request)
1934 {
1935         int             start;
1936         int             count;
1937         home_server     *found = NULL;
1938         home_server     *zombie = NULL;
1939         VALUE_PAIR      *vp;
1940
1941         /*
1942          *      Determine how to pick choose the home server.
1943          */
1944         switch (pool->type) {
1945                 uint32_t hash;
1946
1947                 /*
1948                  *      For load-balancing by client IP address, we
1949                  *      pick a home server by hashing the client IP.
1950                  *
1951                  *      This isn't as even a load distribution as
1952                  *      tracking the State attribute, but it's better
1953                  *      than nothing.
1954                  */
1955         case HOME_POOL_CLIENT_BALANCE:
1956                 switch (request->packet->src_ipaddr.af) {
1957                 case AF_INET:
1958                         hash = fr_hash(&request->packet->src_ipaddr.ipaddr.ip4addr,
1959                                          sizeof(request->packet->src_ipaddr.ipaddr.ip4addr));
1960                         break;
1961                 case AF_INET6:
1962                         hash = fr_hash(&request->packet->src_ipaddr.ipaddr.ip6addr,
1963                                          sizeof(request->packet->src_ipaddr.ipaddr.ip6addr));
1964                         break;
1965                 default:
1966                         hash = 0;
1967                         break;
1968                 }
1969                 start = hash % pool->num_home_servers;
1970                 break;
1971
1972         case HOME_POOL_CLIENT_PORT_BALANCE:
1973                 switch (request->packet->src_ipaddr.af) {
1974                 case AF_INET:
1975                         hash = fr_hash(&request->packet->src_ipaddr.ipaddr.ip4addr,
1976                                          sizeof(request->packet->src_ipaddr.ipaddr.ip4addr));
1977                         break;
1978                 case AF_INET6:
1979                         hash = fr_hash(&request->packet->src_ipaddr.ipaddr.ip6addr,
1980                                          sizeof(request->packet->src_ipaddr.ipaddr.ip6addr));
1981                         break;
1982                 default:
1983                         hash = 0;
1984                         break;
1985                 }
1986                 fr_hash_update(&request->packet->src_port,
1987                                  sizeof(request->packet->src_port), hash);
1988                 start = hash % pool->num_home_servers;
1989                 break;
1990
1991         case HOME_POOL_KEYED_BALANCE:
1992                 if ((vp = pairfind(request->config_items, PW_LOAD_BALANCE_KEY, 0)) != NULL) {
1993                         hash = fr_hash(vp->vp_strvalue, vp->length);
1994                         start = hash % pool->num_home_servers;
1995                         break;
1996                 }
1997                 /* FALL-THROUGH */
1998
1999         case HOME_POOL_LOAD_BALANCE:
2000         case HOME_POOL_FAIL_OVER:
2001                 start = 0;
2002                 break;
2003
2004         default:                /* this shouldn't happen... */
2005                 start = 0;
2006                 break;
2007
2008         }
2009
2010         /*
2011          *      Starting with the home server we chose, loop through
2012          *      all home servers.  If the current one is dead, skip
2013          *      it.  If it is too busy, skip it.
2014          *
2015          *      Otherwise, use it.
2016          */
2017         for (count = 0; count < pool->num_home_servers; count++) {
2018                 home_server *home = pool->servers[(start + count) % pool->num_home_servers];
2019
2020                 if (!home) continue;
2021
2022                 /*
2023                  *      Skip dead home servers.
2024                  */
2025                 if (home->state == HOME_STATE_IS_DEAD) {
2026                         continue;
2027                 }
2028
2029                 /*
2030                  *      This home server is too busy.  Choose another one.
2031                  */
2032                 if (home->currently_outstanding >= home->max_outstanding) {
2033                         continue;
2034                 }
2035
2036 #ifdef WITH_DETAIL
2037                 /*
2038                  *      We read the packet from a detail file, AND it
2039                  *      came from this server.  Don't re-proxy it
2040                  *      there.
2041                  */
2042                 if ((request->listener->type == RAD_LISTEN_DETAIL) &&
2043                     (request->packet->code == PW_ACCOUNTING_REQUEST) &&
2044                     (fr_ipaddr_cmp(&home->ipaddr, &request->packet->src_ipaddr) == 0)) {
2045                         continue;
2046                 }
2047 #endif
2048
2049                 /*
2050                  *      It's zombie, so we remember the first zombie
2051                  *      we find, but we don't mark it as a "live"
2052                  *      server.
2053                  */
2054                 if (home->state == HOME_STATE_ZOMBIE) {
2055                         if (!zombie) zombie = home;
2056                         continue;
2057                 }
2058
2059                 /*
2060                  *      We've found the first "live" one.  Use that.
2061                  */
2062                 if (pool->type != HOME_POOL_LOAD_BALANCE) {
2063                         found = home;
2064                         break;
2065                 }
2066
2067                 /*
2068                  *      Otherwise we're doing some kind of load balancing.
2069                  *      If we haven't found one yet, pick this one.
2070                  */
2071                 if (!found) {
2072                         found = home;
2073                         continue;
2074                 }
2075
2076                 RDEBUG3("PROXY %s %d\t%s %d",
2077                        found->name, found->currently_outstanding,
2078                        home->name, home->currently_outstanding);
2079
2080                 /*
2081                  *      Prefer this server if it's less busy than the
2082                  *      one we had previously found.
2083                  */
2084                 if (home->currently_outstanding < found->currently_outstanding) {
2085                         RDEBUG3("PROXY Choosing %s: It's less busy than %s",
2086                                home->name, found->name);
2087                         found = home;
2088                         continue;
2089                 }
2090
2091                 /*
2092                  *      Ignore servers which are busier than the one
2093                  *      we found.
2094                  */
2095                 if (home->currently_outstanding > found->currently_outstanding) {
2096                         RDEBUG3("PROXY Skipping %s: It's busier than %s",
2097                                home->name, found->name);
2098                         continue;
2099                 }
2100
2101                 /*
2102                  *      From the list of servers which have the same
2103                  *      load, choose one at random.
2104                  */
2105                 if (((count + 1) * (fr_rand() & 0xffff)) < (uint32_t) 0x10000) {
2106                         found = home;
2107                 }
2108         } /* loop over the home servers */
2109
2110         /*
2111          *      We have no live servers, BUT we have a zombie.  Use
2112          *      the zombie as a last resort.
2113          */
2114         if (!found && zombie) {
2115                 found = zombie;
2116                 zombie = NULL;
2117         }
2118
2119         /*
2120          *      There's a fallback if they're all dead.
2121          */
2122         if (!found && pool->fallback) {
2123                 found = pool->fallback;
2124         }
2125
2126         if (found) {
2127         update_and_return:
2128                 /*
2129                  *      Allocate the proxy packet, only if it wasn't
2130                  *      already allocated by a module.  This check is
2131                  *      mainly to support the proxying of EAP-TTLS and
2132                  *      EAP-PEAP tunneled requests.
2133                  *
2134                  *      In those cases, the EAP module creates a
2135                  *      "fake" request, and recursively passes it
2136                  *      through the authentication stage of the
2137                  *      server.  The module then checks if the request
2138                  *      was supposed to be proxied, and if so, creates
2139                  *      a proxy packet from the TUNNELED request, and
2140                  *      not from the EAP request outside of the
2141                  *      tunnel.
2142                  *
2143                  *      The proxy then works like normal, except that
2144                  *      the response packet is "eaten" by the EAP
2145                  *      module, and encapsulated into an EAP packet.
2146                  */
2147                 if (!request->proxy) {
2148                         if ((request->proxy = rad_alloc(TRUE)) == NULL) {
2149                                 radlog(L_ERR|L_CONS, "no memory");
2150                                 exit(1);
2151                         }
2152
2153                         /*
2154                          *      Copy the request, then look up name
2155                          *      and plain-text password in the copy.
2156                          *
2157                          *      Note that the User-Name attribute is
2158                          *      the *original* as sent over by the
2159                          *      client.  The Stripped-User-Name
2160                          *      attribute is the one hacked through
2161                          *      the 'hints' file.
2162                          */
2163                         request->proxy->vps =  paircopy(request->packet->vps);
2164                 }
2165
2166                 /*
2167                  *      Update the various fields as appropriate.
2168                  */
2169                 request->proxy->src_ipaddr = found->src_ipaddr;
2170                 request->proxy->src_port = 0;
2171                 request->proxy->dst_ipaddr = found->ipaddr;
2172                 request->proxy->dst_port = found->port;
2173                 request->home_server = found;
2174
2175                 /*
2176                  *      We're supposed to add a Message-Authenticator
2177                  *      if it doesn't exist, and it doesn't exist.
2178                  */
2179                 if (found->message_authenticator &&
2180                     (request->packet->code == PW_AUTHENTICATION_REQUEST) &&
2181                     !pairfind(request->proxy->vps, PW_MESSAGE_AUTHENTICATOR, 0)) {
2182                         radius_pairmake(request, &request->proxy->vps,
2183                                         "Message-Authenticator", "0x00",
2184                                         T_OP_SET);
2185                 }
2186
2187                 return found;
2188         }
2189
2190         /*
2191          *      No live match found, and no fallback to the "DEFAULT"
2192          *      realm.  We fix this by blindly marking all servers as
2193          *      "live".  But only do it for ones that don't support
2194          *      "pings", as they will be marked live when they
2195          *      actually are live.
2196          */
2197         if (!realm_config->fallback &&
2198             realm_config->wake_all_if_all_dead) {
2199                 for (count = 0; count < pool->num_home_servers; count++) {
2200                         home_server *home = pool->servers[count];
2201
2202                         if (!home) continue;
2203
2204                         if ((home->state == HOME_STATE_IS_DEAD) &&
2205                             (home->ping_check == HOME_PING_CHECK_NONE)) {
2206                                 home->state = HOME_STATE_ALIVE;
2207                                 if (!found) found = home;
2208                         }
2209                 }
2210
2211                 if (found) goto update_and_return;
2212         }
2213
2214         /*
2215          *      Still nothing.  Look up the DEFAULT realm, but only
2216          *      if we weren't looking up the NULL or DEFAULT realms.
2217          */
2218         if (realm_config->fallback &&
2219             realmname &&
2220             (strcmp(realmname, "NULL") != 0) &&
2221             (strcmp(realmname, "DEFAULT") != 0)) {
2222                 REALM *rd = realm_find("DEFAULT");
2223
2224                 if (!rd) return NULL;
2225
2226                 pool = NULL;
2227                 if (request->packet->code == PW_AUTHENTICATION_REQUEST) {
2228                         pool = rd->auth_pool;
2229
2230                 } else if (request->packet->code == PW_ACCOUNTING_REQUEST) {
2231                         pool = rd->acct_pool;
2232                 }
2233                 if (!pool) return NULL;
2234
2235                 RDEBUG2("PROXY - realm %s has no live home servers.  Falling back to the DEFAULT realm.", realmname);
2236                 return home_server_ldb(rd->name, pool, request);
2237         }
2238
2239         /*
2240          *      Still haven't found anything.  Oh well.
2241          */
2242         return NULL;
2243 }
2244
2245
2246 home_server *home_server_find(fr_ipaddr_t *ipaddr, int port, int proto)
2247 {
2248         home_server myhome;
2249
2250         memset(&myhome, 0, sizeof(myhome));
2251         myhome.ipaddr = *ipaddr;
2252         myhome.port = port;
2253 #ifdef WITH_TCP
2254         myhome.proto = proto;
2255 #else
2256         myhome.proto = IPPROTO_UDP;
2257 #endif
2258         myhome.server = NULL;   /* we're not called for internal proxying */
2259
2260         return rbtree_finddata(home_servers_byaddr, &myhome);
2261 }
2262
2263 #ifdef WITH_COA
2264 home_server *home_server_byname(const char *name, int type)
2265 {
2266         home_server myhome;
2267
2268         memset(&myhome, 0, sizeof(myhome));
2269         myhome.type = type;
2270         myhome.name = name;
2271
2272         return rbtree_finddata(home_servers_byname, &myhome);
2273 }
2274 #endif
2275
2276 #ifdef WITH_STATS
2277 home_server *home_server_bynumber(int number)
2278 {
2279         home_server myhome;
2280
2281         memset(&myhome, 0, sizeof(myhome));
2282         myhome.number = number;
2283         myhome.server = NULL;   /* we're not called for internal proxying */
2284
2285         return rbtree_finddata(home_servers_bynumber, &myhome);
2286 }
2287 #endif
2288
2289 home_pool_t *home_pool_byname(const char *name, int type)
2290 {
2291         home_pool_t mypool;
2292
2293         memset(&mypool, 0, sizeof(mypool));
2294         mypool.name = name;
2295         mypool.server_type = type;
2296         return rbtree_finddata(home_pools_byname, &mypool);
2297 }
2298
2299 #endif