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 RCSID("$Id$")
  25
  26 #include <freeradius-devel/radiusd.h>
  27 #include <freeradius-devel/rad_assert.h>
  28
  29 #include <sys/stat.h>
  30
  31 #include <ctype.h>
  32 #include <fcntl.h>
  33
  34 static rbtree_t *realms_byname = NULL;
  35
  36 #ifdef HAVE_REGEX_H
  37 typedef struct realm_regex_t {
  38         REALM   *realm;
  39         struct realm_regex_t *next;
  40 } realm_regex_t;
  41
  42 static realm_regex_t *realms_regex = NULL;
  43
  44 #endif /* HAVE_REGEX_H */
  45
  46 typedef struct realm_config_t {
  47         CONF_SECTION    *cs;
  48         int             dead_time;
  49         int             retry_count;
  50         int             retry_delay;
  51         bool            fallback;
  52         bool            wake_all_if_all_dead;
  53 } realm_config_t;
  54
  55 static realm_config_t *realm_config = NULL;
  56
  57 #ifdef WITH_PROXY
  58 static rbtree_t *home_servers_byaddr = NULL;
  59 static rbtree_t *home_servers_byname = NULL;
  60 #ifdef WITH_STATS
  61 static int home_server_max_number = 0;
  62 static rbtree_t *home_servers_bynumber = NULL;
  63 #endif
  64
  65 static rbtree_t *home_pools_byname = NULL;
  66
  67 /*
  68  *  Map the proxy server configuration parameters to variables.
  69  */
  70 static const CONF_PARSER proxy_config[] = {
  71         { "retry_delay",  PW_TYPE_INTEGER,
  72           offsetof(realm_config_t, retry_delay),
  73           NULL, STRINGIFY(RETRY_DELAY) },
  74
  75         { "retry_count",  PW_TYPE_INTEGER,
  76           offsetof(realm_config_t, retry_count),
  77           NULL, STRINGIFY(RETRY_COUNT) },
  78
  79         { "default_fallback", PW_TYPE_BOOLEAN,
  80           offsetof(realm_config_t, fallback),
  81           NULL, "no" },
  82
  83         { "dead_time",    PW_TYPE_INTEGER,
  84           offsetof(realm_config_t, dead_time),
  85           NULL, STRINGIFY(DEAD_TIME) },
  86
  87         { "wake_all_if_all_dead", PW_TYPE_BOOLEAN,
  88           offsetof(realm_config_t, wake_all_if_all_dead),
  89           NULL, "no" },
  90
  91         { NULL, -1, 0, NULL, NULL }
  92 };
  93 #endif
  94
  95 static int realm_name_cmp(void const *one, void const *two)
  96 {
  97         REALM const *a = one;
  98         REALM const *b = two;
  99
 100         return strcasecmp(a->name, b->name);
 101 }
 102
 103
 104 #ifdef WITH_PROXY
 105 static void home_server_free(void *data)
 106 {
 107         home_server_t *home = data;
 108
 109         talloc_free(home);
 110 }
 111
 112 static int home_server_name_cmp(void const *one, void const *two)
 113 {
 114         home_server_t const *a = one;
 115         home_server_t const *b = two;
 116
 117         if (a->type < b->type) return -1;
 118         if (a->type > b->type) return +1;
 119
 120         return strcasecmp(a->name, b->name);
 121 }
 122
 123 static int home_server_addr_cmp(void const *one, void const *two)
 124 {
 125         int rcode;
 126         home_server_t const *a = one;
 127         home_server_t const *b = two;
 128
 129         if (a->server && !b->server) return -1;
 130         if (!a->server && b->server) return +1;
 131         if (a->server && b->server) {
 132                 rcode = a->type - b->type;
 133                 if (rcode != 0) return rcode;
 134                 return strcmp(a->server, b->server);
 135         }
 136
 137         if (a->port < b->port) return -1;
 138         if (a->port > b->port) return +1;
 139
 140 #ifdef WITH_TCP
 141         if (a->proto < b->proto) return -1;
 142         if (a->proto > b->proto) return +1;
 143 #endif
 144
 145         rcode = fr_ipaddr_cmp(&a->src_ipaddr, &b->src_ipaddr);
 146         if (rcode != 0) return rcode;
 147
 148         return fr_ipaddr_cmp(&a->ipaddr, &b->ipaddr);
 149 }
 150
 151 #ifdef WITH_STATS
 152 static int home_server_number_cmp(void const *one, void const *two)
 153 {
 154         home_server_t const *a = one;
 155         home_server_t const *b = two;
 156
 157         return (a->number - b->number);
 158 }
 159 #endif
 160
 161 static int home_pool_name_cmp(void const *one, void const *two)
 162 {
 163         home_pool_t const *a = one;
 164         home_pool_t const *b = two;
 165
 166         if (a->server_type < b->server_type) return -1;
 167         if (a->server_type > b->server_type) return +1;
 168
 169         return strcasecmp(a->name, b->name);
 170 }
 171
 172
 173 static size_t xlat_cs(CONF_SECTION *cs, char const *fmt, char *out, size_t outlen)
 174
 175 {
 176         char const *value = NULL;
 177
 178         /*
 179          *      Instance name
 180          */
 181         if (strcmp(fmt, "instance") == 0) {
 182                 value = cf_section_name2(cs);
 183                 if (!value) {
 184                         *out = '\0';
 185                         return 0;
 186                 }
 187         } else {
 188                 CONF_PAIR *cp;
 189
 190                 cp = cf_pair_find(cs, fmt);
 191                 if (!cp || !(value = cf_pair_value(cp))) {
 192                         *out = '\0';
 193                         return 0;
 194                 }
 195         }
 196
 197         strlcpy(out, value, outlen);
 198
 199         return strlen(out);
 200 }
 201
 202
 203 /*
 204  *      Xlat for %{home_server:foo}
 205  */
 206 static ssize_t xlat_home_server(UNUSED void *instance, REQUEST *request,
 207                                 char const *fmt, char *out, size_t outlen)
 208 {
 209         if (!fmt || !out || (outlen < 1)) return 0;
 210
 211         if (!request || !request->home_server) {
 212                 RWDEBUG("No home_server associated with this request");
 213
 214                 *out = '\0';
 215                 return 0;
 216         }
 217
 218         return xlat_cs(request->home_server->cs, fmt, out, outlen);
 219 }
 220
 221
 222 /*
 223  *      Xlat for %{home_server_pool:foo}
 224  */
 225 static ssize_t xlat_server_pool(UNUSED void *instance, REQUEST *request,
 226                                 char const *fmt, char *out, size_t outlen)
 227 {
 228         if (!fmt || !out || (outlen < 1)) return 0;
 229
 230         if (!request || !request->home_pool) {
 231                 RWDEBUG("No home_pool associated with this request");
 232
 233                 *out = '\0';
 234                 return 0;
 235         }
 236
 237         return xlat_cs(request->home_pool->cs, fmt, out, outlen);
 238 }
 239 #endif
 240
 241 void realms_free(void)
 242 {
 243 #ifdef WITH_PROXY
 244 #ifdef WITH_STATS
 245         rbtree_free(home_servers_bynumber);
 246         home_servers_bynumber = NULL;
 247 #endif
 248
 249         rbtree_free(home_servers_byname);
 250         home_servers_byname = NULL;
 251
 252         rbtree_free(home_servers_byaddr);
 253         home_servers_byaddr = NULL;
 254
 255         rbtree_free(home_pools_byname);
 256         home_pools_byname = NULL;
 257 #endif
 258
 259         rbtree_free(realms_byname);
 260         realms_byname = NULL;
 261
 262 #ifdef HAVE_REGEX_H
 263         if (realms_regex) {
 264                 realm_regex_t *this, *next;
 265
 266                 for (this = realms_regex; this != NULL; this = next) {
 267                         next = this->next;
 268                         free(this->realm);
 269                         free(this);
 270                 }
 271                 realms_regex = NULL;
 272         }
 273 #endif
 274
 275         talloc_free(realm_config);
 276         realm_config = NULL;
 277 }
 278
 279
 280 #ifdef WITH_PROXY
 281 static CONF_PARSER limit_config[] = {
 282         { "max_connections", PW_TYPE_INTEGER,
 283           offsetof(home_server_t, limit.max_connections), NULL,   "16" },
 284
 285         { "max_requests", PW_TYPE_INTEGER,
 286           offsetof(home_server_t, limit.max_requests), NULL,   "0" },
 287
 288         { "lifetime", PW_TYPE_INTEGER,
 289           offsetof(home_server_t, limit.lifetime), NULL,   "0" },
 290
 291         { "idle_timeout", PW_TYPE_INTEGER,
 292           offsetof(home_server_t, limit.idle_timeout), NULL,   "0" },
 293
 294         { NULL, -1, 0, NULL, NULL }             /* end the list */
 295 };
 296
 297 static struct in_addr hs_ip4addr;
 298 static struct in6_addr hs_ip6addr;
 299 static char *hs_srcipaddr = NULL;
 300 static char *hs_type = NULL;
 301 static char *hs_check = NULL;
 302 static char *hs_virtual_server = NULL;
 303 #ifdef WITH_TCP
 304 static char *hs_proto = NULL;
 305 #endif
 306
 307 #ifdef WITH_COA
 308 static CONF_PARSER home_server_coa[] = {
 309         { "irt",  PW_TYPE_INTEGER,
 310           offsetof(home_server_t, coa_irt), 0, STRINGIFY(2) },
 311         { "mrt",  PW_TYPE_INTEGER,
 312           offsetof(home_server_t, coa_mrt), 0, STRINGIFY(16) },
 313         { "mrc",  PW_TYPE_INTEGER,
 314           offsetof(home_server_t, coa_mrc), 0, STRINGIFY(5) },
 315         { "mrd",  PW_TYPE_INTEGER,
 316           offsetof(home_server_t, coa_mrd), 0, STRINGIFY(30) },
 317
 318         { NULL, -1, 0, NULL, NULL }             /* end the list */
 319 };
 320 #endif
 321
 322 static CONF_PARSER home_server_config[] = {
 323         { "ipaddr",  PW_TYPE_IPADDR,
 324           0, &hs_ip4addr,  NULL },
 325         { "ipv6addr",  PW_TYPE_IPV6ADDR,
 326           0, &hs_ip6addr, NULL },
 327         { "virtual_server",  PW_TYPE_STRING_PTR,
 328           0, &hs_virtual_server, NULL },
 329
 330         { "port", PW_TYPE_INTEGER,
 331           offsetof(home_server_t,port), NULL,   "0" },
 332
 333         { "type",  PW_TYPE_STRING_PTR,
 334           0, &hs_type, NULL },
 335
 336 #ifdef WITH_TCP
 337         { "proto",  PW_TYPE_STRING_PTR,
 338           0, &hs_proto, NULL },
 339 #endif
 340
 341         { "secret",  PW_TYPE_STRING_PTR,
 342           offsetof(home_server_t,secret), NULL,  NULL},
 343
 344         { "src_ipaddr",  PW_TYPE_STRING_PTR,
 345           0, &hs_srcipaddr,  NULL },
 346
 347         { "response_window", PW_TYPE_INTEGER,
 348           offsetof(home_server_t,response_window), NULL,   "30" },
 349         { "max_outstanding", PW_TYPE_INTEGER,
 350           offsetof(home_server_t,max_outstanding), NULL,   "65536" },
 351
 352         { "zombie_period", PW_TYPE_INTEGER,
 353           offsetof(home_server_t,zombie_period), NULL,   "40" },
 354         { "status_check", PW_TYPE_STRING_PTR,
 355           0, &hs_check,   "none" },
 356         { "ping_check", PW_TYPE_STRING_PTR,
 357           0, &hs_check,   NULL },
 358
 359         { "ping_interval", PW_TYPE_INTEGER,
 360           offsetof(home_server_t,ping_interval), NULL,   "30" },
 361         { "check_interval", PW_TYPE_INTEGER,
 362           offsetof(home_server_t,ping_interval), NULL,   "30" },
 363         { "num_answers_to_alive", PW_TYPE_INTEGER,
 364           offsetof(home_server_t,num_pings_to_alive), NULL,   "3" },
 365         { "revive_interval", PW_TYPE_INTEGER,
 366           offsetof(home_server_t,revive_interval), NULL,   "300" },
 367         { "status_check_timeout", PW_TYPE_INTEGER,
 368           offsetof(home_server_t,ping_timeout), NULL,   "4" },
 369
 370         { "username",  PW_TYPE_STRING_PTR,
 371           offsetof(home_server_t,ping_user_name), NULL,  NULL},
 372         { "password",  PW_TYPE_STRING_PTR,
 373           offsetof(home_server_t,ping_user_password), NULL,  NULL},
 374
 375 #ifdef WITH_STATS
 376         { "historic_average_window", PW_TYPE_INTEGER,
 377           offsetof(home_server_t,ema.window), NULL,  NULL },
 378 #endif
 379
 380 #ifdef WITH_COA
 381         {  "coa", PW_TYPE_SUBSECTION, 0, NULL, (void const *) home_server_coa },
 382 #endif
 383
 384         { "limit", PW_TYPE_SUBSECTION, 0, NULL, (void const *) limit_config },
 385
 386         { NULL, -1, 0, NULL, NULL }             /* end the list */
 387 };
 388
 389
 390 static void null_free(UNUSED void *data)
 391 {
 392 }
 393
 394 static int home_server_add(realm_config_t *rc, CONF_SECTION *cs)
 395 {
 396         char const *name2;
 397         home_server_t *home;
 398         int dual = false;
 399         CONF_PAIR *cp;
 400         CONF_SECTION *tls;
 401
 402         hs_virtual_server = NULL;
 403
 404         name2 = cf_section_name2(cs);
 405         if (!name2) {
 406                 cf_log_err_cs(cs,
 407                            "Home server section is missing a name.");
 408                 return 0;
 409         }
 410
 411         home = talloc_zero(rc, home_server_t);
 412
 413         home->name = name2;
 414         home->cs = cs;
 415         home->state = HOME_STATE_UNKNOWN;
 416
 417         /*
 418          *      Last packet sent / received are zero.
 419          */
 420
 421         memset(&hs_ip4addr, 0, sizeof(hs_ip4addr));
 422         memset(&hs_ip6addr, 0, sizeof(hs_ip6addr));
 423         if (cf_section_parse(cs, home, home_server_config) < 0) {
 424                 goto error;
 425         }
 426
 427         /*
 428          *      Figure out which one to use.
 429          */
 430         if (cf_pair_find(cs, "ipaddr")) {
 431                 home->ipaddr.af = AF_INET;
 432                 home->ipaddr.ipaddr.ip4addr = hs_ip4addr;
 433
 434         } else if (cf_pair_find(cs, "ipv6addr")) {
 435                 home->ipaddr.af = AF_INET6;
 436                 home->ipaddr.ipaddr.ip6addr = hs_ip6addr;
 437
 438         } else if ((cp = cf_pair_find(cs, "virtual_server")) != NULL) {
 439                 home->ipaddr.af = AF_UNSPEC;
 440                 home->server = cf_pair_value(cp);
 441                 if (!home->server) {
 442                         cf_log_err_cs(cs,
 443                                    "Invalid value for virtual_server");
 444                         goto error;
 445                 }
 446
 447                 if (!cf_section_sub_find_name2(rc->cs, "server", home->server)) {
 448
 449                         cf_log_err_cs(cs,
 450                                    "No such server %s", home->server);
 451                         goto error;
 452                 }
 453
 454                 /*
 455                  *      When CoA is used, the user has to specify the type
 456                  *      of the home server, even when they point to
 457                  *      virtual servers.
 458                  */
 459                 home->secret = strdup("");
 460                 goto skip_port;
 461
 462         } else {
 463                 cf_log_err_cs(cs,
 464                            "No ipaddr, ipv6addr, or virtual_server defined for home server \"%s\".",
 465                            name2);
 466         error:
 467                 TALLOC_FREE(hs_type);
 468                 hs_check = NULL;
 469                 hs_srcipaddr = NULL;
 470 #ifdef WITH_TCP
 471                 hs_proto = NULL;
 472 #endif
 473                 return 0;
 474         }
 475
 476         if (!home->port || (home->port > 65535)) {
 477                 cf_log_err_cs(cs,
 478                            "No port, or invalid port defined for home server %s.",
 479                            name2);
 480                 goto error;
 481         }
 482
 483         if (0) {
 484                 cf_log_err_cs(cs,
 485                            "Fatal error!  Home server %s is ourselves!",
 486                            name2);
 487                 goto error;
 488         }
 489
 490         /*
 491          *      Use a reasonable default.
 492          */
 493  skip_port:
 494         if (!hs_type) hs_type = talloc_strdup(cs, "auth+acct");
 495
 496         if (strcasecmp(hs_type, "auth") == 0) {
 497                 home->type = HOME_TYPE_AUTH;
 498
 499         } else if (strcasecmp(hs_type, "acct") == 0) {
 500                 home->type = HOME_TYPE_ACCT;
 501
 502         } else if (strcasecmp(hs_type, "auth+acct") == 0) {
 503                 home->type = HOME_TYPE_AUTH;
 504                 dual = true;
 505
 506 #ifdef WITH_COA
 507         } else if (strcasecmp(hs_type, "coa") == 0) {
 508                 home->type = HOME_TYPE_COA;
 509                 dual = false;
 510
 511                 if (home->server != NULL) {
 512                         cf_log_err_cs(cs,
 513                                    "Home servers of type \"coa\" cannot point to a virtual server");
 514                         goto error;
 515                 }
 516 #endif
 517
 518         } else {
 519                 cf_log_err_cs(cs,
 520                            "Invalid type \"%s\" for home server %s.",
 521                            hs_type, name2);
 522                 goto error;
 523         }
 524         if (hs_type) talloc_free(hs_type);
 525         hs_type = NULL;
 526
 527         if (!hs_check || (strcasecmp(hs_check, "none") == 0)) {
 528                 home->ping_check = HOME_PING_CHECK_NONE;
 529
 530         } else if (strcasecmp(hs_check, "status-server") == 0) {
 531                 home->ping_check = HOME_PING_CHECK_STATUS_SERVER;
 532
 533         } else if (strcasecmp(hs_check, "request") == 0) {
 534                 home->ping_check = HOME_PING_CHECK_REQUEST;
 535
 536                 if (!home->ping_user_name ||
 537                     !*home->ping_user_name) {
 538                         cf_log_err_cs(cs, "You must supply a 'username' to enable status_check=request");
 539                         goto error;
 540                 }
 541
 542                 if ((home->type == HOME_TYPE_AUTH) &&
 543                     (!home->ping_user_password ||
 544                      !*home->ping_user_password)) {
 545                         cf_log_err_cs(cs, "You must supply a password to enable status_check=request");
 546                         goto error;
 547                 }
 548
 549         } else {
 550                 cf_log_err_cs(cs,
 551                            "Invalid status_check \"%s\" for home server %s.",
 552                            hs_check, name2);
 553                 goto error;
 554         }
 555         hs_check = NULL;
 556
 557         if ((home->ping_check != HOME_PING_CHECK_NONE) &&
 558             (home->ping_check != HOME_PING_CHECK_STATUS_SERVER)) {
 559                 if (!home->ping_user_name) {
 560                         cf_log_err_cs(cs, "You must supply a user name to enable status_check=request");
 561                         goto error;
 562                 }
 563
 564                 if ((home->type == HOME_TYPE_AUTH) &&
 565                     !home->ping_user_password) {
 566                         cf_log_err_cs(cs, "You must supply a password to enable status_check=request");
 567                         goto error;
 568                 }
 569         }
 570
 571         home->proto = IPPROTO_UDP;
 572 #ifdef WITH_TCP
 573         if (hs_proto) {
 574                 if (strcmp(hs_proto, "udp") == 0) {
 575                         hs_proto = NULL;
 576
 577                 } else if (strcmp(hs_proto, "tcp") == 0) {
 578                         hs_proto = NULL;
 579                         home->proto = IPPROTO_TCP;
 580
 581                         if (home->ping_check != HOME_PING_CHECK_NONE) {
 582                                 cf_log_err_cs(cs,
 583                                            "Only 'status_check = none' is allowed for home servers with 'proto = tcp'");
 584                                 goto error;
 585                         }
 586
 587                 } else {
 588                         cf_log_err_cs(cs,
 589                                    "Unknown proto \"%s\".", hs_proto);
 590                         goto error;
 591                 }
 592         }
 593 #endif
 594
 595         if (!home->server &&
 596             rbtree_finddata(home_servers_byaddr, home)) {
 597                 cf_log_err_cs(cs, "Duplicate home server");
 598                 goto error;
 599         }
 600
 601         /*
 602          *      Check the TLS configuration.
 603          */
 604         tls = cf_section_sub_find(cs, "tls");
 605
 606         /*
 607          *      If were doing RADSEC (tls+tcp) the secret should default
 608          *      to radsec, else a secret must be set.
 609          */
 610         if (!home->secret) {
 611                 if (!tls || (home->proto != IPPROTO_TCP)) {
 612                         cf_log_err_cs(cs, "No shared secret defined for home server %s", name2);
 613                         goto error;
 614                 }
 615
 616                 home->secret = "radsec";
 617         }
 618
 619         /*
 620          *      If the home is a virtual server, don't look up source IP.
 621          */
 622         if (!home->server) {
 623                 rad_assert(home->ipaddr.af != AF_UNSPEC);
 624
 625                 /*
 626                  *      Otherwise look up the source IP using the same
 627                  *      address family as the destination IP.
 628                  */
 629                 if (hs_srcipaddr) {
 630                         if (ip_hton(hs_srcipaddr, home->ipaddr.af, &home->src_ipaddr) < 0) {
 631                                 cf_log_err_cs(cs, "Failed parsing src_ipaddr");
 632                                 goto error;
 633                         }
 634
 635                 } else {
 636                         /*
 637                          *      Source isn't specified: Source is
 638                          *      the correct address family, but all zeros.
 639                          */
 640                         memset(&home->src_ipaddr, 0, sizeof(home->src_ipaddr));
 641                         home->src_ipaddr.af = home->ipaddr.af;
 642                 }
 643
 644                 if (tls && (home->proto != IPPROTO_TCP)) {
 645                         cf_log_err_cs(cs, "TLS transport is not available for UDP sockets.");
 646                         goto error;
 647                 }
 648
 649 #ifndef WITH_TLS
 650
 651                 if (tls) {
 652                         cf_log_err_cs(cs, "TLS transport is not available in this executable.");
 653                         goto error;
 654                 }
 655 #else
 656                 /*
 657                  *      Parse the SSL client configuration.
 658                  */
 659                 if (tls) {
 660                         home->tls = tls_client_conf_parse(tls);
 661                         if (!home->tls) {
 662                                 goto error;
 663                         }
 664                 }
 665 #endif
 666
 667         } else if (tls) {
 668                 cf_log_err_cs(cs, "Virtual home_servers cannot have a \"tls\" subsection");
 669                 goto error;
 670         }
 671
 672         /*
 673          *      Make sure that this is set.
 674          */
 675         if (home->src_ipaddr.af == AF_UNSPEC) {
 676                 home->src_ipaddr.af = home->ipaddr.af;
 677         }
 678
 679         hs_srcipaddr = NULL;
 680
 681         if (rbtree_finddata(home_servers_byname, home) != NULL) {
 682                 cf_log_err_cs(cs,
 683                            "Duplicate home server name %s.", name2);
 684                 goto error;
 685         }
 686
 687         if (!home->server &&
 688             (rbtree_finddata(home_servers_byaddr, home) != NULL)) {
 689                 cf_log_err_cs(cs,
 690                            "Duplicate home server IP %s.", name2);
 691                 goto error;
 692         }
 693
 694         if (!rbtree_insert(home_servers_byname, home)) {
 695                 cf_log_err_cs(cs,
 696                            "Internal error %d adding home server %s.",
 697                            __LINE__, name2);
 698                 goto error;
 699         }
 700
 701         if (!home->server &&
 702             !rbtree_insert(home_servers_byaddr, home)) {
 703                 rbtree_deletebydata(home_servers_byname, home);
 704                 cf_log_err_cs(cs,
 705                            "Internal error %d adding home server %s.",
 706                            __LINE__, name2);
 707                 goto error;
 708         }
 709
 710 #ifdef WITH_STATS
 711         home->number = home_server_max_number++;
 712         if (!rbtree_insert(home_servers_bynumber, home)) {
 713                 rbtree_deletebydata(home_servers_byname, home);
 714                 if (home->ipaddr.af != AF_UNSPEC) {
 715                         rbtree_deletebydata(home_servers_byname, home);
 716                 }
 717                 cf_log_err_cs(cs,
 718                            "Internal error %d adding home server %s.",
 719                            __LINE__, name2);
 720                 goto error;
 721         }
 722 #endif
 723
 724         if (home->max_outstanding < 8) home->max_outstanding = 8;
 725         if (home->max_outstanding > 65536*16) home->max_outstanding = 65536*16;
 726
 727         if (home->ping_interval < 6) home->ping_interval = 6;
 728         if (home->ping_interval > 120) home->ping_interval = 120;
 729
 730         if (home->response_window < 1) home->response_window = 1;
 731         if (home->response_window > 60) home->response_window = 60;
 732         if (home->response_window > mainconfig.max_request_time) home->response_window = mainconfig.max_request_time;
 733
 734         if (home->zombie_period < 1) home->zombie_period = 1;
 735         if (home->zombie_period > 120) home->zombie_period = 120;
 736
 737         if (home->zombie_period < home->response_window) {
 738                 home->zombie_period = home->response_window;
 739         }
 740
 741         if (home->num_pings_to_alive < 3) home->num_pings_to_alive = 3;
 742         if (home->num_pings_to_alive > 10) home->num_pings_to_alive = 10;
 743
 744         if (home->ping_timeout < 3) home->ping_timeout = 3;
 745         if (home->ping_timeout > 10) home->ping_timeout = 10;
 746
 747         if (home->revive_interval < 60) home->revive_interval = 60;
 748         if (home->revive_interval > 3600) home->revive_interval = 3600;
 749
 750 #ifdef WITH_COA
 751         if (home->coa_irt < 1) home->coa_irt = 1;
 752         if (home->coa_irt > 5) home->coa_irt = 5;
 753
 754         if (home->coa_mrc < 0) home->coa_mrc = 0;
 755         if (home->coa_mrc > 20 ) home->coa_mrc = 20;
 756
 757         if (home->coa_mrt < 0) home->coa_mrt = 0;
 758         if (home->coa_mrt > 30 ) home->coa_mrt = 30;
 759
 760         if (home->coa_mrd < 5) home->coa_mrd = 5;
 761         if (home->coa_mrd > 60 ) home->coa_mrd = 60;
 762 #endif
 763
 764         if (home->limit.max_connections > 1024) home->limit.max_connections = 1024;
 765
 766 #ifdef WITH_TCP
 767         /*
 768          *      UDP sockets can't be connection limited.
 769          */
 770         if (home->proto != IPPROTO_TCP) home->limit.max_connections = 0;
 771 #endif
 772
 773         if ((home->limit.idle_timeout > 0) && (home->limit.idle_timeout < 5))
 774                 home->limit.idle_timeout = 5;
 775         if ((home->limit.lifetime > 0) && (home->limit.lifetime < 5))
 776                 home->limit.lifetime = 5;
 777         if ((home->limit.lifetime > 0) && (home->limit.idle_timeout > home->limit.lifetime))
 778                 home->limit.idle_timeout = 0;
 779
 780         tls = cf_item_parent(cf_sectiontoitem(cs));
 781         if (strcmp(cf_section_name1(tls), "server") == 0) {
 782                 home->parent_server = cf_section_name2(tls);
 783         }
 784
 785         if (dual) {
 786                 home_server_t *home2 = talloc(rc, home_server_t);
 787
 788                 memcpy(home2, home, sizeof(*home2));
 789
 790                 home2->type = HOME_TYPE_ACCT;
 791                 home2->port++;
 792                 home2->ping_user_password = NULL;
 793                 home2->cs = cs;
 794                 home2->parent_server = home->parent_server;
 795
 796                 if (!rbtree_insert(home_servers_byname, home2)) {
 797                         cf_log_err_cs(cs,
 798                                    "Internal error %d adding home server %s.",
 799                                    __LINE__, name2);
 800                         free(home2);
 801                         return 0;
 802                 }
 803
 804                 if (!home->server &&
 805                     !rbtree_insert(home_servers_byaddr, home2)) {
 806                         rbtree_deletebydata(home_servers_byname, home2);
 807                         cf_log_err_cs(cs,
 808                                    "Internal error %d adding home server %s.",
 809                                    __LINE__, name2);
 810                         free(home2);
 811                         return 0;
 812                 }
 813
 814 #ifdef WITH_STATS
 815                 home2->number = home_server_max_number++;
 816                 if (!rbtree_insert(home_servers_bynumber, home2)) {
 817                         rbtree_deletebydata(home_servers_byname, home2);
 818                         if (!home2->server) {
 819                                 rbtree_deletebydata(home_servers_byname, home2);
 820                         }
 821                         cf_log_err_cs(cs,
 822                                    "Internal error %d adding home server %s.",
 823                                    __LINE__, name2);
 824                         free(home2);
 825                         return 0;
 826                 }
 827 #endif
 828         }
 829
 830         /*
 831          *      Mark it as already processed
 832          */
 833         cf_data_add(cs, "home_server", null_free, null_free);
 834
 835         return 1;
 836 }
 837
 838
 839 static home_pool_t *server_pool_alloc(char const *name, home_pool_type_t type,
 840                                       int server_type, int num_home_servers)
 841 {
 842         home_pool_t *pool;
 843
 844         pool = rad_malloc(sizeof(*pool) + (sizeof(pool->servers[0]) *
 845                                            num_home_servers));
 846         if (!pool) return NULL; /* just for pairanoia */
 847
 848         memset(pool, 0, sizeof(*pool) + (sizeof(pool->servers[0]) *
 849                                          num_home_servers));
 850
 851         pool->name = name;
 852         pool->type = type;
 853         pool->server_type = server_type;
 854         pool->num_home_servers = num_home_servers;
 855
 856         return pool;
 857 }
 858
 859 /*
 860  * Ensure any home_server clauses in a home_server_pool section reference
 861  * defined home servers, which should already have been created, regardless
 862  * of where they appear in the configuration.
 863  */
 864 static int pool_check_home_server(UNUSED realm_config_t *rc, CONF_PAIR *cp,
 865                                   char const *name, int server_type,
 866                                   home_server_t **phome)
 867 {
 868         home_server_t myhome, *home;
 869
 870         if (!name) {
 871                 cf_log_err_cp(cp,
 872                            "No value given for home_server.");
 873                 return 0;
 874         }
 875
 876         myhome.name = name;
 877         myhome.type = server_type;
 878         home = rbtree_finddata(home_servers_byname, &myhome);
 879         if (home) {
 880                 *phome = home;
 881                 return 1;
 882         }
 883
 884         cf_log_err_cp(cp, "Unknown home_server \"%s\".", name);
 885         return 0;
 886 }
 887
 888
 889 static int server_pool_add(realm_config_t *rc,
 890                            CONF_SECTION *cs, int server_type, int do_print)
 891 {
 892         char const *name2;
 893         home_pool_t *pool = NULL;
 894         char const *value;
 895         CONF_PAIR *cp;
 896         int num_home_servers;
 897         home_server_t *home;
 898
 899         name2 = cf_section_name1(cs);
 900         if (!name2 || ((strcasecmp(name2, "server_pool") != 0) &&
 901                        (strcasecmp(name2, "home_server_pool") != 0))) {
 902                 cf_log_err_cs(cs,
 903                            "Section is not a home_server_pool.");
 904                 return 0;
 905         }
 906
 907         name2 = cf_section_name2(cs);
 908         if (!name2) {
 909                 cf_log_err_cs(cs,
 910                            "Server pool section is missing a name.");
 911                 return 0;
 912         }
 913
 914         /*
 915          *      Count the home servers and initalize them.
 916          */
 917         num_home_servers = 0;
 918         for (cp = cf_pair_find(cs, "home_server");
 919              cp != NULL;
 920              cp = cf_pair_find_next(cs, cp, "home_server")) {
 921                 num_home_servers++;
 922
 923                 if (!pool_check_home_server(rc, cp, cf_pair_value(cp),
 924                                             server_type, &home)) {
 925                         return 0;
 926                 }
 927         }
 928
 929         if (num_home_servers == 0) {
 930                 cf_log_err_cs(cs,
 931                            "No home servers defined in pool %s",
 932                            name2);
 933                 goto error;
 934         }
 935
 936         pool = server_pool_alloc(name2, HOME_POOL_FAIL_OVER, server_type,
 937                                  num_home_servers);
 938         if (!pool) {
 939                 cf_log_err_cs(cs, "Failed allocating memory for pool");
 940                 goto error;
 941         }
 942         pool->cs = cs;
 943
 944
 945         /*
 946          *      Fallback servers must be defined, and must be
 947          *      virtual servers.
 948          */
 949         cp = cf_pair_find(cs, "fallback");
 950         if (cp) {
 951 #ifdef WITH_COA
 952                 if (server_type == HOME_TYPE_COA) {
 953                         cf_log_err_cs(cs, "Home server pools of type \"coa\" cannot have a fallback virtual server.");
 954                         goto error;
 955                 }
 956 #endif
 957
 958                 if (!pool_check_home_server(rc, cp, cf_pair_value(cp),
 959                                             server_type, &pool->fallback)) {
 960
 961                         goto error;
 962                 }
 963
 964                 if (!pool->fallback->server) {
 965                         cf_log_err_cs(cs, "Fallback home_server %s does NOT contain a virtual_server directive.", pool->fallback->name);
 966                         goto error;
 967                 }
 968         }
 969
 970         if (do_print) cf_log_info(cs, " home_server_pool %s {", name2);
 971
 972         cp = cf_pair_find(cs, "type");
 973         if (cp) {
 974                 static FR_NAME_NUMBER pool_types[] = {
 975                         { "load-balance", HOME_POOL_LOAD_BALANCE },
 976
 977                         { "fail-over", HOME_POOL_FAIL_OVER },
 978                         { "fail_over", HOME_POOL_FAIL_OVER },
 979
 980                         { "round-robin", HOME_POOL_LOAD_BALANCE },
 981                         { "round_robin", HOME_POOL_LOAD_BALANCE },
 982
 983                         { "client-balance", HOME_POOL_CLIENT_BALANCE },
 984                         { "client-port-balance", HOME_POOL_CLIENT_PORT_BALANCE },
 985                         { "keyed-balance", HOME_POOL_KEYED_BALANCE },
 986                         { NULL, 0 }
 987                 };
 988
 989                 value = cf_pair_value(cp);
 990                 if (!value) {
 991                         cf_log_err_cp(cp,
 992                                    "No value given for type.");
 993                         goto error;
 994                 }
 995
 996                 pool->type = fr_str2int(pool_types, value, 0);
 997                 if (!pool->type) {
 998                         cf_log_err_cp(cp,
 999                                    "Unknown type \"%s\".",
1000                                    value);
1001                         goto error;
1002                 }
1003
1004                 if (do_print) cf_log_info(cs, "\ttype = %s", value);
1005         }
1006
1007         cp = cf_pair_find(cs, "virtual_server");
1008         if (cp) {
1009                 pool->virtual_server = cf_pair_value(cp);
1010                 if (!pool->virtual_server) {
1011                         cf_log_err_cp(cp, "No value given for virtual_server");
1012                         goto error;
1013                 }
1014
1015                 if (do_print) {
1016                         cf_log_info(cs, "\tvirtual_server = %s", pool->virtual_server);
1017                 }
1018
1019                 if (!cf_section_sub_find_name2(rc->cs, "server",
1020                                                pool->virtual_server)) {
1021                         cf_log_err_cp(cp, "No such server %s",
1022                                    pool->virtual_server);
1023                         goto error;
1024                 }
1025
1026         }
1027
1028         num_home_servers = 0;
1029         for (cp = cf_pair_find(cs, "home_server");
1030              cp != NULL;
1031              cp = cf_pair_find_next(cs, cp, "home_server")) {
1032                 home_server_t myhome;
1033
1034                 value = cf_pair_value(cp);
1035
1036                 memset(&myhome, 0, sizeof(myhome));
1037                 myhome.name = value;
1038                 myhome.type = server_type;
1039
1040                 home = rbtree_finddata(home_servers_byname, &myhome);
1041                 if (!home) {
1042                         DEBUG2("Internal sanity check failed");
1043                         goto error;
1044                 }
1045
1046                 if (0) {
1047                         WDEBUG2("Duplicate home server %s in server pool %s", home->name, pool->name);
1048                         continue;
1049                 }
1050
1051                 if (do_print) cf_log_info(cs, "\thome_server = %s", home->name);
1052                 pool->servers[num_home_servers++] = home;
1053         } /* loop over home_server's */
1054
1055         if (pool->fallback && do_print) {
1056                 cf_log_info(cs, "\tfallback = %s", pool->fallback->name);
1057         }
1058
1059         if (!rbtree_insert(home_pools_byname, pool)) {
1060                 rad_assert("Internal sanity check failed");
1061                 goto error;
1062         }
1063
1064         if (do_print) cf_log_info(cs, " }");
1065
1066         cf_data_add(cs, "home_server_pool", pool, free);
1067
1068         rad_assert(pool->server_type != 0);
1069
1070         return 1;
1071
1072  error:
1073         if (do_print) cf_log_info(cs, " }");
1074         free(pool);
1075         return 0;
1076 }
1077 #endif
1078
1079 static int old_server_add(realm_config_t *rc, CONF_SECTION *cs,
1080                           char const *realm,
1081                           char const *name, char const *secret,
1082                           home_pool_type_t ldflag, home_pool_t **pool_p,
1083                           int type, char const *server)
1084 {
1085 #ifdef WITH_PROXY
1086         int i, insert_point, num_home_servers;
1087         home_server_t myhome, *home;
1088         home_pool_t mypool, *pool;
1089         CONF_SECTION *subcs;
1090 #else
1091         (void) rc;              /* -Wunused */
1092         (void) realm;
1093         (void) secret;
1094         (void) ldflag;
1095         (void) type;
1096         (void) server;
1097 #endif
1098
1099         /*
1100          *      LOCAL realms get sanity checked, and nothing else happens.
1101          */
1102         if (strcmp(name, "LOCAL") == 0) {
1103                 if (*pool_p) {
1104                         cf_log_err_cs(cs, "Realm \"%s\" cannot be both LOCAL and remote", name);
1105                         return 0;
1106                 }
1107                 return 1;
1108         }
1109
1110 #ifndef WITH_PROXY
1111         return 0;               /* Not proxying.  Can't do non-LOCAL realms */
1112
1113 #else
1114         mypool.name = realm;
1115         mypool.server_type = type;
1116         pool = rbtree_finddata(home_pools_byname, &mypool);
1117         if (pool) {
1118                 if (pool->type != ldflag) {
1119                         cf_log_err_cs(cs, "Inconsistent ldflag for server pool \"%s\"", name);
1120                         return 0;
1121                 }
1122
1123                 if (pool->server_type != type) {
1124                         cf_log_err_cs(cs, "Inconsistent home server type for server pool \"%s\"", name);
1125                         return 0;
1126                 }
1127         }
1128
1129         myhome.name = name;
1130         myhome.type = type;
1131         home = rbtree_finddata(home_servers_byname, &myhome);
1132         if (home) {
1133                 if (secret && (strcmp(home->secret, secret) != 0)) {
1134                         cf_log_err_cs(cs, "Inconsistent shared secret for home server \"%s\"", name);
1135                         return 0;
1136                 }
1137
1138                 if (home->type != type) {
1139                         cf_log_err_cs(cs, "Inconsistent type for home server \"%s\"", name);
1140                         return 0;
1141                 }
1142
1143                 /*
1144                  *      See if the home server is already listed
1145                  *      in the pool.  If so, do nothing else.
1146                  */
1147                 if (pool) for (i = 0; i < pool->num_home_servers; i++) {
1148                         if (pool->servers[i] == home) {
1149                                 return 1;
1150                         }
1151                 }
1152         }
1153
1154         /*
1155          *      If we do have a pool, check that there is room to
1156          *      insert the home server we've found, or the one that we
1157          *      create here.
1158          *
1159          *      Note that we insert it into the LAST available
1160          *      position, in order to maintain the same order as in
1161          *      the configuration files.
1162          */
1163         insert_point = -1;
1164         if (pool) {
1165                 for (i = pool->num_home_servers - 1; i >= 0; i--) {
1166                         if (pool->servers[i]) break;
1167
1168                         if (!pool->servers[i]) {
1169                                 insert_point = i;
1170                         }
1171                 }
1172
1173                 if (insert_point < 0) {
1174                         cf_log_err_cs(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);
1175                         return 0;
1176                 }
1177         }
1178
1179         /*
1180          *      No home server, allocate one.
1181          */
1182         if (!home) {
1183                 char const *p;
1184                 char *q;
1185
1186                 home = talloc_zero(rc, home_server_t);
1187                 home->name = name;
1188                 home->hostname = name;
1189                 home->type = type;
1190                 home->secret = secret;
1191                 home->cs = cs;
1192                 home->proto = IPPROTO_UDP;
1193
1194                 p = strchr(name, ':');
1195                 if (!p) {
1196                         if (type == HOME_TYPE_AUTH) {
1197                                 home->port = PW_AUTH_UDP_PORT;
1198                         } else {
1199                                 home->port = PW_ACCT_UDP_PORT;
1200                         }
1201
1202                         p = name;
1203                         q = NULL;
1204
1205                 } else if (p == name) {
1206                                 cf_log_err_cs(cs,
1207                                            "Invalid hostname %s.",
1208                                            name);
1209                                 free(home);
1210                                 return 0;
1211
1212                 } else {
1213                         home->port = atoi(p + 1);
1214                         if ((home->port == 0) || (home->port > 65535)) {
1215                                 cf_log_err_cs(cs,
1216                                            "Invalid port %s.",
1217                                            p + 1);
1218                                 free(home);
1219                                 return 0;
1220                         }
1221
1222                         q = rad_malloc((p - name) + 1);
1223                         memcpy(q, name, (p - name));
1224                         q[p - name] = '\0';
1225                         p = q;
1226                 }
1227
1228                 if (!server) {
1229                         if (ip_hton(p, AF_UNSPEC, &home->ipaddr) < 0) {
1230                                 cf_log_err_cs(cs,
1231                                            "Failed looking up hostname %s.",
1232                                            p);
1233                                 free(home);
1234                                 free(q);
1235                                 return 0;
1236                         }
1237                         home->src_ipaddr.af = home->ipaddr.af;
1238                 } else {
1239                         home->ipaddr.af = AF_UNSPEC;
1240                         home->server = server;
1241                 }
1242                 free(q);
1243
1244                 /*
1245                  *      Use the old-style configuration.
1246                  */
1247                 home->max_outstanding = 65535*16;
1248                 home->zombie_period = rc->retry_delay * rc->retry_count;
1249                 if (home->zombie_period == 0) home->zombie_period =30;
1250                 home->response_window = home->zombie_period - 1;
1251
1252                 home->ping_check = HOME_PING_CHECK_NONE;
1253
1254                 home->revive_interval = rc->dead_time;
1255
1256                 if (rbtree_finddata(home_servers_byaddr, home)) {
1257                         cf_log_err_cs(cs, "Home server %s has the same IP address and/or port as another home server.", name);
1258                         free(home);
1259                         return 0;
1260                 }
1261
1262                 if (!rbtree_insert(home_servers_byname, home)) {
1263                         cf_log_err_cs(cs, "Internal error %d adding home server %s.", __LINE__, name);
1264                         free(home);
1265                         return 0;
1266                 }
1267
1268                 if (!rbtree_insert(home_servers_byaddr, home)) {
1269                         rbtree_deletebydata(home_servers_byname, home);
1270                         cf_log_err_cs(cs, "Internal error %d adding home server %s.", __LINE__, name);
1271                         free(home);
1272                         return 0;
1273                 }
1274
1275 #ifdef WITH_STATS
1276                 home->number = home_server_max_number++;
1277                 if (!rbtree_insert(home_servers_bynumber, home)) {
1278                         rbtree_deletebydata(home_servers_byname, home);
1279                         if (home->ipaddr.af != AF_UNSPEC) {
1280                                 rbtree_deletebydata(home_servers_byname, home);
1281                         }
1282                         cf_log_err_cs(cs,
1283                                    "Internal error %d adding home server %s.",
1284                                    __LINE__, name);
1285                         free(home);
1286                         return 0;
1287                 }
1288 #endif
1289         }
1290
1291         /*
1292          *      We now have a home server, see if we can insert it
1293          *      into pre-existing pool.
1294          */
1295         if (insert_point >= 0) {
1296                 rad_assert(pool != NULL);
1297                 pool->servers[insert_point] = home;
1298                 return 1;
1299         }
1300
1301         rad_assert(pool == NULL);
1302         rad_assert(home != NULL);
1303
1304         /*
1305          *      Count the old-style realms of this name.
1306          */
1307         num_home_servers = 0;
1308         for (subcs = cf_section_find_next(cs, NULL, "realm");
1309              subcs != NULL;
1310              subcs = cf_section_find_next(cs, subcs, "realm")) {
1311                 char const *this = cf_section_name2(subcs);
1312
1313                 if (!this || (strcmp(this, realm) != 0)) continue;
1314                 num_home_servers++;
1315         }
1316
1317         if (num_home_servers == 0) {
1318                 cf_log_err_cs(cs, "Internal error counting pools for home server %s.", name);
1319                 free(home);
1320                 return 0;
1321         }
1322
1323         pool = server_pool_alloc(realm, ldflag, type, num_home_servers);
1324         pool->cs = cs;
1325
1326         pool->servers[0] = home;
1327
1328         if (!rbtree_insert(home_pools_byname, pool)) {
1329                 rad_assert("Internal sanity check failed");
1330                 return 0;
1331         }
1332
1333         *pool_p = pool;
1334
1335         return 1;
1336 #endif
1337 }
1338
1339 static int old_realm_config(realm_config_t *rc, CONF_SECTION *cs, REALM *r)
1340 {
1341         char const *host;
1342         char const *secret = NULL;
1343         home_pool_type_t ldflag;
1344         CONF_PAIR *cp;
1345
1346         cp = cf_pair_find(cs, "ldflag");
1347         ldflag = HOME_POOL_FAIL_OVER;
1348         if (cp) {
1349                 host = cf_pair_value(cp);
1350                 if (!host) {
1351                         cf_log_err_cp(cp, "No value specified for ldflag");
1352                         return 0;
1353                 }
1354
1355                 if (strcasecmp(host, "fail_over") == 0) {
1356                         cf_log_info(cs, "\tldflag = fail_over");
1357
1358                 } else if (strcasecmp(host, "round_robin") == 0) {
1359                         ldflag = HOME_POOL_LOAD_BALANCE;
1360                         cf_log_info(cs, "\tldflag = round_robin");
1361
1362                 } else {
1363                         cf_log_err_cs(cs, "Unknown value \"%s\" for ldflag", host);
1364                         return 0;
1365                 }
1366         } /* else don't print it. */
1367
1368         /*
1369          *      Allow old-style if it doesn't exist, or if it exists and
1370          *      it's LOCAL.
1371          */
1372         cp = cf_pair_find(cs, "authhost");
1373         if (cp) {
1374                 host = cf_pair_value(cp);
1375                 if (!host) {
1376                         cf_log_err_cp(cp, "No value specified for authhost");
1377                         return 0;
1378                 }
1379
1380                 if (strcmp(host, "LOCAL") != 0) {
1381                         cp = cf_pair_find(cs, "secret");
1382                         if (!cp) {
1383                                 cf_log_err_cs(cs, "No shared secret supplied for realm: %s", r->name);
1384                                 return 0;
1385                         }
1386
1387                         secret = cf_pair_value(cp);
1388                         if (!secret) {
1389                                 cf_log_err_cp(cp, "No value specified for secret");
1390                                 return 0;
1391                         }
1392                 }
1393
1394                 cf_log_info(cs, "\tauthhost = %s",  host);
1395
1396                 if (!old_server_add(rc, cs, r->name, host, secret, ldflag,
1397                                     &r->auth_pool, HOME_TYPE_AUTH, NULL)) {
1398                         return 0;
1399                 }
1400         }
1401
1402         cp = cf_pair_find(cs, "accthost");
1403         if (cp) {
1404                 host = cf_pair_value(cp);
1405                 if (!host) {
1406                         cf_log_err_cp(cp, "No value specified for accthost");
1407                         return 0;
1408                 }
1409
1410                 /*
1411                  *      Don't look for a secret again if it was found
1412                  *      above.
1413                  */
1414                 if ((strcmp(host, "LOCAL") != 0) && !secret) {
1415                         cp = cf_pair_find(cs, "secret");
1416                         if (!cp) {
1417                                 cf_log_err_cs(cs, "No shared secret supplied for realm: %s", r->name);
1418                                 return 0;
1419                         }
1420
1421                         secret = cf_pair_value(cp);
1422                         if (!secret) {
1423                                 cf_log_err_cp(cp, "No value specified for secret");
1424                                 return 0;
1425                         }
1426                 }
1427
1428                 cf_log_info(cs, "\taccthost = %s", host);
1429
1430                 if (!old_server_add(rc, cs, r->name, host, secret, ldflag,
1431                                     &r->acct_pool, HOME_TYPE_ACCT, NULL)) {
1432                         return 0;
1433                 }
1434         }
1435
1436         cp = cf_pair_find(cs, "virtual_server");
1437         if (cp) {
1438                 host = cf_pair_value(cp);
1439                 if (!host) {
1440                         cf_log_err_cp(cp, "No value specified for virtual_server");
1441                         return 0;
1442                 }
1443
1444                 cf_log_info(cs, "\tvirtual_server = %s", host);
1445
1446                 if (!old_server_add(rc, cs, r->name, host, "", ldflag,
1447                                     &r->auth_pool, HOME_TYPE_AUTH, host)) {
1448                         return 0;
1449                 }
1450                 if (!old_server_add(rc, cs, r->name, host, "", ldflag,
1451                                     &r->acct_pool, HOME_TYPE_ACCT, host)) {
1452                         return 0;
1453                 }
1454         }
1455
1456         if (secret) cf_log_info(cs, "\tsecret = %s", secret);
1457
1458         return 1;
1459
1460 }
1461
1462
1463 #ifdef WITH_PROXY
1464 static int add_pool_to_realm(realm_config_t *rc, CONF_SECTION *cs,
1465                              char const *name, home_pool_t **dest,
1466                              int server_type, int do_print)
1467 {
1468         home_pool_t mypool, *pool;
1469
1470         mypool.name = name;
1471         mypool.server_type = server_type;
1472
1473         pool = rbtree_finddata(home_pools_byname, &mypool);
1474         if (!pool) {
1475                 CONF_SECTION *pool_cs;
1476
1477                 pool_cs = cf_section_sub_find_name2(rc->cs,
1478                                                     "home_server_pool",
1479                                                     name);
1480                 if (!pool_cs) {
1481                         pool_cs = cf_section_sub_find_name2(rc->cs,
1482                                                             "server_pool",
1483                                                             name);
1484                 }
1485                 if (!pool_cs) {
1486                         cf_log_err_cs(cs, "Failed to find home_server_pool \"%s\"", name);
1487                         return 0;
1488                 }
1489
1490                 if (!server_pool_add(rc, pool_cs, server_type, do_print)) {
1491                         return 0;
1492                 }
1493
1494                 pool = rbtree_finddata(home_pools_byname, &mypool);
1495                 if (!pool) {
1496                         ERROR("Internal sanity check failed in add_pool_to_realm");
1497                         return 0;
1498                 }
1499         }
1500
1501         if (pool->server_type != server_type) {
1502                 cf_log_err_cs(cs, "Incompatible home_server_pool \"%s\" (mixed auth_pool / acct_pool)", name);
1503                 return 0;
1504         }
1505
1506         *dest = pool;
1507
1508         return 1;
1509 }
1510 #endif
1511
1512
1513 static int realm_add(realm_config_t *rc, CONF_SECTION *cs)
1514 {
1515         char const *name2;
1516         REALM *r = NULL;
1517         CONF_PAIR *cp;
1518 #ifdef WITH_PROXY
1519         home_pool_t *auth_pool, *acct_pool;
1520         char const *auth_pool_name, *acct_pool_name;
1521 #ifdef WITH_COA
1522         char const *coa_pool_name;
1523         home_pool_t *coa_pool;
1524 #endif
1525 #endif
1526
1527         name2 = cf_section_name1(cs);
1528         if (!name2 || (strcasecmp(name2, "realm") != 0)) {
1529                 cf_log_err_cs(cs, "Section is not a realm.");
1530                 return 0;
1531         }
1532
1533         name2 = cf_section_name2(cs);
1534         if (!name2) {
1535                 cf_log_err_cs(cs, "Realm section is missing the realm name.");
1536                 return 0;
1537         }
1538
1539 #ifdef WITH_PROXY
1540         auth_pool = acct_pool = NULL;
1541         auth_pool_name = acct_pool_name = NULL;
1542 #ifdef WITH_COA
1543         coa_pool = NULL;
1544         coa_pool_name = NULL;
1545 #endif
1546
1547         /*
1548          *      Prefer new configuration to old one.
1549          */
1550         cp = cf_pair_find(cs, "pool");
1551         if (!cp) cp = cf_pair_find(cs, "home_server_pool");
1552         if (cp) auth_pool_name = cf_pair_value(cp);
1553         if (cp && auth_pool_name) {
1554                 acct_pool_name = auth_pool_name;
1555                 if (!add_pool_to_realm(rc, cs,
1556                                        auth_pool_name, &auth_pool,
1557                                        HOME_TYPE_AUTH, 1)) {
1558                         return 0;
1559                 }
1560                 if (!add_pool_to_realm(rc, cs,
1561                                        auth_pool_name, &acct_pool,
1562                                        HOME_TYPE_ACCT, 0)) {
1563                         return 0;
1564                 }
1565         }
1566
1567         cp = cf_pair_find(cs, "auth_pool");
1568         if (cp) auth_pool_name = cf_pair_value(cp);
1569         if (cp && auth_pool_name) {
1570                 if (auth_pool) {
1571                         cf_log_err_cs(cs, "Cannot use \"pool\" and \"auth_pool\" at the same time.");
1572                         return 0;
1573                 }
1574                 if (!add_pool_to_realm(rc, cs,
1575                                        auth_pool_name, &auth_pool,
1576                                        HOME_TYPE_AUTH, 1)) {
1577                         return 0;
1578                 }
1579         }
1580
1581         cp = cf_pair_find(cs, "acct_pool");
1582         if (cp) acct_pool_name = cf_pair_value(cp);
1583         if (cp && acct_pool_name) {
1584                 int do_print = true;
1585
1586                 if (acct_pool) {
1587                         cf_log_err_cs(cs, "Cannot use \"pool\" and \"acct_pool\" at the same time.");
1588                         return 0;
1589                 }
1590
1591                 if (!auth_pool ||
1592                     (auth_pool_name &&
1593                      (strcmp(auth_pool_name, acct_pool_name) != 0))) {
1594                         do_print = true;
1595                 }
1596
1597                 if (!add_pool_to_realm(rc, cs,
1598                                        acct_pool_name, &acct_pool,
1599                                        HOME_TYPE_ACCT, do_print)) {
1600                         return 0;
1601                 }
1602         }
1603
1604 #ifdef WITH_COA
1605         cp = cf_pair_find(cs, "coa_pool");
1606         if (cp) coa_pool_name = cf_pair_value(cp);
1607         if (cp && coa_pool_name) {
1608                 int do_print = true;
1609
1610                 if (!add_pool_to_realm(rc, cs,
1611                                        coa_pool_name, &coa_pool,
1612                                        HOME_TYPE_COA, do_print)) {
1613                         return 0;
1614                 }
1615         }
1616 #endif
1617 #endif
1618
1619         cf_log_info(cs, " realm %s {", name2);
1620
1621 #ifdef WITH_PROXY
1622         /*
1623          *      The realm MAY already exist if it's an old-style realm.
1624          *      In that case, merge the old-style realm with this one.
1625          */
1626         r = realm_find2(name2);
1627         if (r && (strcmp(r->name, name2) == 0)) {
1628                 if (cf_pair_find(cs, "auth_pool") ||
1629                     cf_pair_find(cs, "acct_pool")) {
1630                         cf_log_err_cs(cs, "Duplicate realm \"%s\"", name2);
1631                         goto error;
1632                 }
1633
1634                 if (!old_realm_config(rc, cs, r)) {
1635                         goto error;
1636                 }
1637
1638                 cf_log_info(cs, " } # realm %s", name2);
1639                 return 1;
1640         }
1641 #endif
1642
1643 #ifdef HAVE_REGEX_H
1644         if (name2[0] == '~') {
1645                 int rcode;
1646                 regex_t reg;
1647
1648                 /*
1649                  *      Include substring matches.
1650                  */
1651                 rcode = regcomp(&reg, name2 + 1, REG_EXTENDED | REG_NOSUB | REG_ICASE);
1652                 if (rcode != 0) {
1653                         char buffer[256];
1654
1655                         regerror(rcode, &reg, buffer, sizeof(buffer));
1656
1657                         cf_log_err_cs(cs,
1658                                    "Invalid regex \"%s\": %s",
1659                                    name2 + 1, buffer);
1660                         goto error;
1661                 }
1662                 regfree(&reg);
1663         }
1664 #endif
1665
1666         r = rad_malloc(sizeof(*r));
1667         memset(r, 0, sizeof(*r));
1668
1669         r->name = name2;
1670         r->striprealm = 1;
1671 #ifdef WITH_PROXY
1672         r->auth_pool = auth_pool;
1673         r->acct_pool = acct_pool;
1674 #ifdef WITH_COA
1675         r->coa_pool = coa_pool;
1676 #endif
1677
1678         if (auth_pool_name &&
1679             (auth_pool_name == acct_pool_name)) { /* yes, ptr comparison */
1680                 cf_log_info(cs, "\tpool = %s", auth_pool_name);
1681         } else {
1682                 if (auth_pool_name) cf_log_info(cs, "\tauth_pool = %s", auth_pool_name);
1683                 if (acct_pool_name) cf_log_info(cs, "\tacct_pool = %s", acct_pool_name);
1684 #ifdef WITH_COA
1685                 if (coa_pool_name) cf_log_info(cs, "\tcoa_pool = %s", coa_pool_name);
1686 #endif
1687         }
1688 #endif
1689
1690         cp = cf_pair_find(cs, "nostrip");
1691         if (cp && (cf_pair_value(cp) == NULL)) {
1692                 r->striprealm = 0;
1693                 cf_log_info(cs, "\tnostrip");
1694         }
1695
1696         /*
1697          *      We're a new-style realm.  Complain if we see the old
1698          *      directives.
1699          */
1700         if (r->auth_pool || r->acct_pool) {
1701                 if (((cp = cf_pair_find(cs, "authhost")) != NULL) ||
1702                     ((cp = cf_pair_find(cs, "accthost")) != NULL) ||
1703                     ((cp = cf_pair_find(cs, "secret")) != NULL) ||
1704                     ((cp = cf_pair_find(cs, "ldflag")) != NULL)) {
1705                         WDEBUG2("Ignoring old-style configuration entry \"%s\" in realm \"%s\"", cf_pair_attr(cp), r->name);
1706                 }
1707
1708
1709                 /*
1710                  *      The realm MAY be an old-style realm, as there
1711                  *      was no auth_pool or acct_pool.  Double-check
1712                  *      it, just to be safe.
1713                  */
1714         } else if (!old_realm_config(rc, cs, r)) {
1715                 goto error;
1716         }
1717
1718 #ifdef HAVE_REGEX_H
1719         /*
1720          *      It's a regex.  Add it to a separate list.
1721          */
1722         if (name2[0] == '~') {
1723                 realm_regex_t *rr, **last;
1724
1725                 rr = rad_malloc(sizeof(*rr));
1726
1727                 last = &realms_regex;
1728                 while (*last) last = &((*last)->next);  /* O(N^2)... sue me. */
1729
1730                 r->name = name2;
1731                 rr->realm = r;
1732                 rr->next = NULL;
1733
1734                 *last = rr;
1735
1736                 cf_log_info(cs, " }");
1737                 return 1;
1738         }
1739 #endif
1740
1741         if (!rbtree_insert(realms_byname, r)) {
1742                 rad_assert("Internal sanity check failed");
1743                 goto error;
1744         }
1745
1746         cf_log_info(cs, " }");
1747
1748         return 1;
1749
1750  error:
1751         cf_log_info(cs, " } # realm %s", name2);
1752         free(r);
1753         return 0;
1754 }
1755
1756 #ifdef WITH_COA
1757 static const FR_NAME_NUMBER home_server_types[] = {
1758         { "auth", HOME_TYPE_AUTH },
1759         { "auth+acct", HOME_TYPE_AUTH },
1760         { "acct", HOME_TYPE_ACCT },
1761         { "coa", HOME_TYPE_COA },
1762         { NULL, 0 }
1763 };
1764
1765 static int pool_peek_type(CONF_SECTION *config, CONF_SECTION *cs)
1766 {
1767         int home;
1768         char const *name, *type;
1769         CONF_PAIR *cp;
1770         CONF_SECTION *server_cs;
1771
1772         cp = cf_pair_find(cs, "home_server");
1773         if (!cp) {
1774                 cf_log_err_cs(cs, "Pool does not contain a \"home_server\" entry");
1775                 return HOME_TYPE_INVALID;
1776         }
1777
1778         name = cf_pair_value(cp);
1779         if (!name) {
1780                 cf_log_err_cp(cp, "home_server entry does not reference a home server");
1781                 return HOME_TYPE_INVALID;
1782         }
1783
1784         server_cs = cf_section_sub_find_name2(config, "home_server", name);
1785         if (!server_cs) {
1786                 cf_log_err_cp(cp, "home_server \"%s\" does not exist", name);
1787                 return HOME_TYPE_INVALID;
1788         }
1789
1790         cp = cf_pair_find(server_cs, "type");
1791         if (!cp) {
1792                 cf_log_err_cs(server_cs, "home_server %s does not contain a \"type\" entry", name);
1793                 return HOME_TYPE_INVALID;
1794         }
1795
1796         type = cf_pair_value(cp);
1797         if (!type) {
1798                 cf_log_err_cs(server_cs, "home_server %s contains an empty \"type\" entry", name);
1799                 return HOME_TYPE_INVALID;
1800         }
1801
1802         home = fr_str2int(home_server_types, type, HOME_TYPE_INVALID);
1803         if (home == HOME_TYPE_INVALID) {
1804                 cf_log_err_cs(server_cs, "home_server %s contains an invalid \"type\" entry of value \"%s\"", name, type);
1805                 return HOME_TYPE_INVALID;
1806         }
1807
1808         return home;            /* 'cause we miss it so much */
1809 }
1810 #endif
1811
1812 int realms_init(CONF_SECTION *config)
1813 {
1814         CONF_SECTION *cs;
1815 #ifdef WITH_PROXY
1816         CONF_SECTION *server_cs;
1817 #endif
1818         realm_config_t *rc, *old_rc;
1819
1820         if (realms_byname) return 1;
1821
1822         realms_byname = rbtree_create(realm_name_cmp, free, 0);
1823         if (!realms_byname) {
1824                 realms_free();
1825                 return 0;
1826         }
1827
1828 #ifdef WITH_PROXY
1829         home_servers_byaddr = rbtree_create(home_server_addr_cmp, home_server_free, 0);
1830         if (!home_servers_byaddr) {
1831                 realms_free();
1832                 return 0;
1833         }
1834
1835         home_servers_byname = rbtree_create(home_server_name_cmp, NULL, 0);
1836         if (!home_servers_byname) {
1837                 realms_free();
1838                 return 0;
1839         }
1840
1841 #ifdef WITH_STATS
1842         home_servers_bynumber = rbtree_create(home_server_number_cmp, NULL, 0);
1843         if (!home_servers_bynumber) {
1844                 realms_free();
1845                 return 0;
1846         }
1847 #endif
1848
1849         home_pools_byname = rbtree_create(home_pool_name_cmp, NULL, 0);
1850         if (!home_pools_byname) {
1851                 realms_free();
1852                 return 0;
1853         }
1854 #endif
1855
1856         rc = talloc_zero(NULL, realm_config_t);
1857         rc->cs = config;
1858
1859 #ifdef WITH_PROXY
1860         cs = cf_subsection_find_next(config, NULL, "proxy");
1861         if (cs) {
1862                 if (cf_section_parse(cs, rc, proxy_config) < 0) {
1863                         ERROR("Failed parsing proxy section");
1864                 error:
1865                         realms_free();
1866                         /*
1867                          *      Must be called after realms_free as home_servers
1868                          *      parented by rc are in trees freed by realms_free()
1869                          */
1870                         talloc_free(rc);
1871                         return 0;
1872                 }
1873         } else {
1874                 rc->dead_time = DEAD_TIME;
1875                 rc->retry_count = RETRY_COUNT;
1876                 rc->retry_delay = RETRY_DELAY;
1877                 rc->fallback = 0;
1878                 rc->wake_all_if_all_dead= 0;
1879         }
1880
1881         for (cs = cf_subsection_find_next(config, NULL, "home_server");
1882              cs != NULL;
1883              cs = cf_subsection_find_next(config, cs, "home_server")) {
1884                 if (!home_server_add(rc, cs)) goto error;
1885         }
1886
1887         /*
1888          *      Loop over virtual servers to find homes which are
1889          *      defined in them.
1890          */
1891         for (server_cs = cf_subsection_find_next(config, NULL, "server");
1892              server_cs != NULL;
1893              server_cs = cf_subsection_find_next(config, server_cs, "server")) {
1894                 for (cs = cf_subsection_find_next(server_cs, NULL, "home_server");
1895                      cs != NULL;
1896                      cs = cf_subsection_find_next(server_cs, cs, "home_server")) {
1897                         if (!home_server_add(rc, cs)) goto error;
1898                 }
1899         }
1900 #endif
1901
1902         for (cs = cf_subsection_find_next(config, NULL, "realm");
1903              cs != NULL;
1904              cs = cf_subsection_find_next(config, cs, "realm")) {
1905                 if (!realm_add(rc, cs)) goto error;
1906         }
1907
1908 #ifdef WITH_COA
1909         /*
1910          *      CoA pools aren't necessarily tied to realms.
1911          */
1912         for (cs = cf_subsection_find_next(config, NULL, "home_server_pool");
1913              cs != NULL;
1914              cs = cf_subsection_find_next(config, cs, "home_server_pool")) {
1915                 int type;
1916
1917                 /*
1918                  *      Pool was already loaded.
1919                  */
1920                 if (cf_data_find(cs, "home_server_pool")) continue;
1921
1922                 type = pool_peek_type(config, cs);
1923                 if (type == HOME_TYPE_INVALID) goto error;
1924                 if (!server_pool_add(rc, cs, type, true)) goto error;
1925         }
1926 #endif
1927
1928
1929 #ifdef WITH_PROXY
1930         xlat_register("home_server", xlat_home_server, NULL, NULL);
1931         xlat_register("home_server_pool", xlat_server_pool, NULL, NULL);
1932 #endif
1933
1934         /*
1935          *      Swap pointers atomically.
1936          */
1937         old_rc = realm_config;
1938         realm_config = rc;
1939         talloc_free(old_rc);
1940
1941         return 1;
1942 }
1943
1944 /*
1945  *      Find a realm where "name" might be the regex.
1946  */
1947 REALM *realm_find2(char const *name)
1948 {
1949         REALM myrealm;
1950         REALM *realm;
1951
1952         if (!name) name = "NULL";
1953
1954         myrealm.name = name;
1955         realm = rbtree_finddata(realms_byname, &myrealm);
1956         if (realm) return realm;
1957
1958 #ifdef HAVE_REGEX_H
1959         if (realms_regex) {
1960                 realm_regex_t *this;
1961
1962                 for (this = realms_regex; this != NULL; this = this->next) {
1963                         if (strcmp(this->realm->name, name) == 0) {
1964                                 return this->realm;
1965                         }
1966                 }
1967         }
1968 #endif
1969
1970         /*
1971          *      Couldn't find a realm.  Look for DEFAULT.
1972          */
1973         myrealm.name = "DEFAULT";
1974         return rbtree_finddata(realms_byname, &myrealm);
1975 }
1976
1977
1978 /*
1979  *      Find a realm in the REALM list.
1980  */
1981 REALM *realm_find(char const *name)
1982 {
1983         REALM myrealm;
1984         REALM *realm;
1985
1986         if (!name) name = "NULL";
1987
1988         myrealm.name = name;
1989         realm = rbtree_finddata(realms_byname, &myrealm);
1990         if (realm) return realm;
1991
1992 #ifdef HAVE_REGEX_H
1993         if (realms_regex) {
1994                 realm_regex_t *this;
1995
1996                 for (this = realms_regex; this != NULL; this = this->next) {
1997                         int compare;
1998                         regex_t reg;
1999
2000                         /*
2001                          *      Include substring matches.
2002                          */
2003                         if (regcomp(&reg, this->realm->name + 1, REG_EXTENDED | REG_NOSUB | REG_ICASE) != 0) {
2004                                 continue;
2005                         }
2006
2007                         compare = regexec(&reg, name, 0, NULL, 0);
2008                         regfree(&reg);
2009
2010                         if (compare == 0) return this->realm;
2011                 }
2012         }
2013 #endif
2014
2015         /*
2016          *      Couldn't find a realm.  Look for DEFAULT.
2017          */
2018         myrealm.name = "DEFAULT";
2019         return rbtree_finddata(realms_byname, &myrealm);
2020 }
2021
2022
2023 #ifdef WITH_PROXY
2024
2025 /*
2026  *      Allocate the proxy list if it doesn't already exist, and copy request
2027  *      VPs into it. Setup src/dst IP addresses based on home server, and
2028  *      calculate and add the message-authenticator.
2029  *
2030  *      This is a distinct function from home_server_ldb, as not all home_server_t
2031  *      lookups result in the *CURRENT* request being proxied,
2032  *      as in rlm_replicate, and this may trigger asserts elsewhere in the
2033  *      server.
2034  */
2035 void home_server_update_request(home_server_t *home, REQUEST *request)
2036 {
2037
2038         /*
2039          *      Allocate the proxy packet, only if it wasn't
2040          *      already allocated by a module.  This check is
2041          *      mainly to support the proxying of EAP-TTLS and
2042          *      EAP-PEAP tunneled requests.
2043          *
2044          *      In those cases, the EAP module creates a
2045          *      "fake" request, and recursively passes it
2046          *      through the authentication stage of the
2047          *      server.  The module then checks if the request
2048          *      was supposed to be proxied, and if so, creates
2049          *      a proxy packet from the TUNNELED request, and
2050          *      not from the EAP request outside of the
2051          *      tunnel.
2052          *
2053          *      The proxy then works like normal, except that
2054          *      the response packet is "eaten" by the EAP
2055          *      module, and encapsulated into an EAP packet.
2056          */
2057         if (!request->proxy) {
2058                 request->proxy = rad_alloc(request, true);
2059                 if (!request->proxy) {
2060                         ERROR("no memory");
2061                         fr_exit(1);
2062                         _exit(1);
2063                 }
2064
2065                 /*
2066                  *      Copy the request, then look up name
2067                  *      and plain-text password in the copy.
2068                  *
2069                  *      Note that the User-Name attribute is
2070                  *      the *original* as sent over by the
2071                  *      client.  The Stripped-User-Name
2072                  *      attribute is the one hacked through
2073                  *      the 'hints' file.
2074                  */
2075                 request->proxy->vps = paircopy(request->proxy,
2076                                                request->packet->vps);
2077         }
2078
2079         /*
2080          *      Update the various fields as appropriate.
2081          */
2082         request->proxy->src_ipaddr = home->src_ipaddr;
2083         request->proxy->src_port = 0;
2084         request->proxy->dst_ipaddr = home->ipaddr;
2085         request->proxy->dst_port = home->port;
2086         request->home_server = home;
2087
2088         /*
2089          *      Access-Requests have a Message-Authenticator added,
2090          *      unless one already exists.
2091          */
2092         if ((request->packet->code == PW_AUTHENTICATION_REQUEST) &&
2093             !pairfind(request->proxy->vps, PW_MESSAGE_AUTHENTICATOR, 0, TAG_ANY)) {
2094                 pairmake(request->proxy, &request->proxy->vps,
2095                          "Message-Authenticator", "0x00",
2096                          T_OP_SET);
2097         }
2098 }
2099
2100 home_server_t *home_server_ldb(char const *realmname,
2101                              home_pool_t *pool, REQUEST *request)
2102 {
2103         int             start;
2104         int             count;
2105         home_server_t   *found = NULL;
2106         home_server_t   *zombie = NULL;
2107         VALUE_PAIR      *vp;
2108
2109         /*
2110          *      Determine how to pick choose the home server.
2111          */
2112         switch (pool->type) {
2113                 uint32_t hash;
2114
2115                 /*
2116                  *      For load-balancing by client IP address, we
2117                  *      pick a home server by hashing the client IP.
2118                  *
2119                  *      This isn't as even a load distribution as
2120                  *      tracking the State attribute, but it's better
2121                  *      than nothing.
2122                  */
2123         case HOME_POOL_CLIENT_BALANCE:
2124                 switch (request->packet->src_ipaddr.af) {
2125                 case AF_INET:
2126                         hash = fr_hash(&request->packet->src_ipaddr.ipaddr.ip4addr,
2127                                          sizeof(request->packet->src_ipaddr.ipaddr.ip4addr));
2128                         break;
2129                 case AF_INET6:
2130                         hash = fr_hash(&request->packet->src_ipaddr.ipaddr.ip6addr,
2131                                          sizeof(request->packet->src_ipaddr.ipaddr.ip6addr));
2132                         break;
2133                 default:
2134                         hash = 0;
2135                         break;
2136                 }
2137                 start = hash % pool->num_home_servers;
2138                 break;
2139
2140         case HOME_POOL_CLIENT_PORT_BALANCE:
2141                 switch (request->packet->src_ipaddr.af) {
2142                 case AF_INET:
2143                         hash = fr_hash(&request->packet->src_ipaddr.ipaddr.ip4addr,
2144                                          sizeof(request->packet->src_ipaddr.ipaddr.ip4addr));
2145                         break;
2146                 case AF_INET6:
2147                         hash = fr_hash(&request->packet->src_ipaddr.ipaddr.ip6addr,
2148                                          sizeof(request->packet->src_ipaddr.ipaddr.ip6addr));
2149                         break;
2150                 default:
2151                         hash = 0;
2152                         break;
2153                 }
2154                 fr_hash_update(&request->packet->src_port,
2155                                  sizeof(request->packet->src_port), hash);
2156                 start = hash % pool->num_home_servers;
2157                 break;
2158
2159         case HOME_POOL_KEYED_BALANCE:
2160                 if ((vp = pairfind(request->config_items, PW_LOAD_BALANCE_KEY, 0, TAG_ANY)) != NULL) {
2161                         hash = fr_hash(vp->vp_strvalue, vp->length);
2162                         start = hash % pool->num_home_servers;
2163                         break;
2164                 }
2165                 /* FALL-THROUGH */
2166
2167         case HOME_POOL_LOAD_BALANCE:
2168         case HOME_POOL_FAIL_OVER:
2169                 start = 0;
2170                 break;
2171
2172         default:                /* this shouldn't happen... */
2173                 start = 0;
2174                 break;
2175
2176         }
2177
2178         /*
2179          *      Starting with the home server we chose, loop through
2180          *      all home servers.  If the current one is dead, skip
2181          *      it.  If it is too busy, skip it.
2182          *
2183          *      Otherwise, use it.
2184          */
2185         for (count = 0; count < pool->num_home_servers; count++) {
2186                 home_server_t *home = pool->servers[(start + count) % pool->num_home_servers];
2187
2188                 if (!home) continue;
2189
2190                 /*
2191                  *      Skip dead home servers.
2192                  *
2193                  *      Home servers that are unknown, alive, or zombie
2194                  *      are used for proxying.
2195                  */
2196                 if (home->state == HOME_STATE_IS_DEAD) {
2197                         continue;
2198                 }
2199
2200                 /*
2201                  *      This home server is too busy.  Choose another one.
2202                  */
2203                 if (home->currently_outstanding >= home->max_outstanding) {
2204                         continue;
2205                 }
2206
2207 #ifdef WITH_DETAIL
2208                 /*
2209                  *      We read the packet from a detail file, AND it
2210                  *      came from this server.  Don't re-proxy it
2211                  *      there.
2212                  */
2213                 if ((request->listener->type == RAD_LISTEN_DETAIL) &&
2214                     (request->packet->code == PW_ACCOUNTING_REQUEST) &&
2215                     (fr_ipaddr_cmp(&home->ipaddr, &request->packet->src_ipaddr) == 0)) {
2216                         continue;
2217                 }
2218 #endif
2219
2220                 /*
2221                  *      Default virtual: ignore homes tied to a
2222                  *      virtual.
2223                  */
2224                 if (!request->server && home->parent_server) {
2225                         continue;
2226                 }
2227
2228                 /*
2229                  *      A virtual AND home is tied to virtual,
2230                  *      ignore ones which don't match.
2231                  */
2232                 if (request->server && home->parent_server &&
2233                     strcmp(request->server, home->parent_server) != 0) {
2234                         continue;
2235                 }
2236
2237                 /*
2238                  *      Allow request->server && !home->parent_server
2239                  *
2240                  *      i.e. virtuals can proxy to globally defined
2241                  *      homes.
2242                  */
2243
2244                 /*
2245                  *      It's zombie, so we remember the first zombie
2246                  *      we find, but we don't mark it as a "live"
2247                  *      server.
2248                  */
2249                 if (home->state == HOME_STATE_ZOMBIE) {
2250                         if (!zombie) zombie = home;
2251                         continue;
2252                 }
2253
2254                 /*
2255                  *      We've found the first "live" one.  Use that.
2256                  */
2257                 if (pool->type != HOME_POOL_LOAD_BALANCE) {
2258                         found = home;
2259                         break;
2260                 }
2261
2262                 /*
2263                  *      Otherwise we're doing some kind of load balancing.
2264                  *      If we haven't found one yet, pick this one.
2265                  */
2266                 if (!found) {
2267                         found = home;
2268                         continue;
2269                 }
2270
2271                 RDEBUG3("PROXY %s %d\t%s %d",
2272                        found->name, found->currently_outstanding,
2273                        home->name, home->currently_outstanding);
2274
2275                 /*
2276                  *      Prefer this server if it's less busy than the
2277                  *      one we had previously found.
2278                  */
2279                 if (home->currently_outstanding < found->currently_outstanding) {
2280                         RDEBUG3("PROXY Choosing %s: It's less busy than %s",
2281                                home->name, found->name);
2282                         found = home;
2283                         continue;
2284                 }
2285
2286                 /*
2287                  *      Ignore servers which are busier than the one
2288                  *      we found.
2289                  */
2290                 if (home->currently_outstanding > found->currently_outstanding) {
2291                         RDEBUG3("PROXY Skipping %s: It's busier than %s",
2292                                home->name, found->name);
2293                         continue;
2294                 }
2295
2296                 /*
2297                  *      From the list of servers which have the same
2298                  *      load, choose one at random.
2299                  */
2300                 if (((count + 1) * (fr_rand() & 0xffff)) < (uint32_t) 0x10000) {
2301                         found = home;
2302                 }
2303         } /* loop over the home servers */
2304
2305         /*
2306          *      We have no live servers, BUT we have a zombie.  Use
2307          *      the zombie as a last resort.
2308          */
2309         if (!found && zombie) {
2310                 found = zombie;
2311                 zombie = NULL;
2312         }
2313
2314         /*
2315          *      There's a fallback if they're all dead.
2316          */
2317         if (!found && pool->fallback) {
2318                 found = pool->fallback;
2319
2320                 WDEBUG("Home server pool %s failing over to fallback %s",
2321                       pool->name, found->server);
2322                 if (pool->in_fallback) goto update_and_return;
2323
2324                 pool->in_fallback = true;
2325
2326                 /*
2327                  *      Run the trigger once an hour saying that
2328                  *      they're all dead.
2329                  */
2330                 if ((pool->time_all_dead + 3600) < request->timestamp) {
2331                         pool->time_all_dead = request->timestamp;
2332                         exec_trigger(request, pool->cs, "home_server_pool.fallback", false);
2333                 }
2334         }
2335
2336         if (found) {
2337         update_and_return:
2338                 if ((found != pool->fallback) && pool->in_fallback) {
2339                         pool->in_fallback = false;
2340                         exec_trigger(request, pool->cs, "home_server_pool.normal", false);
2341                 }
2342
2343                 return found;
2344         }
2345
2346         /*
2347          *      No live match found, and no fallback to the "DEFAULT"
2348          *      realm.  We fix this by blindly marking all servers as
2349          *      "live".  But only do it for ones that don't support
2350          *      "pings", as they will be marked live when they
2351          *      actually are live.
2352          */
2353         if (!realm_config->fallback &&
2354             realm_config->wake_all_if_all_dead) {
2355                 for (count = 0; count < pool->num_home_servers; count++) {
2356                         home_server_t *home = pool->servers[count];
2357
2358                         if (!home) continue;
2359
2360                         if ((home->state == HOME_STATE_IS_DEAD) &&
2361                             (home->ping_check == HOME_PING_CHECK_NONE)) {
2362                                 home->state = HOME_STATE_ALIVE;
2363                                 if (!found) found = home;
2364                         }
2365                 }
2366
2367                 if (found) goto update_and_return;
2368         }
2369
2370         /*
2371          *      Still nothing.  Look up the DEFAULT realm, but only
2372          *      if we weren't looking up the NULL or DEFAULT realms.
2373          */
2374         if (realm_config->fallback &&
2375             realmname &&
2376             (strcmp(realmname, "NULL") != 0) &&
2377             (strcmp(realmname, "DEFAULT") != 0)) {
2378                 REALM *rd = realm_find("DEFAULT");
2379
2380                 if (!rd) return NULL;
2381
2382                 pool = NULL;
2383                 if (request->packet->code == PW_AUTHENTICATION_REQUEST) {
2384                         pool = rd->auth_pool;
2385
2386                 } else if (request->packet->code == PW_ACCOUNTING_REQUEST) {
2387                         pool = rd->acct_pool;
2388                 }
2389                 if (!pool) return NULL;
2390
2391                 RDEBUG2("PROXY - realm %s has no live home servers.  Falling back to the DEFAULT realm.", realmname);
2392                 return home_server_ldb(rd->name, pool, request);
2393         }
2394
2395         /*
2396          *      Still haven't found anything.  Oh well.
2397          */
2398         return NULL;
2399 }
2400
2401
2402 home_server_t *home_server_find(fr_ipaddr_t *ipaddr, int port, int proto)
2403 {
2404         home_server_t myhome;
2405
2406         memset(&myhome, 0, sizeof(myhome));
2407         myhome.ipaddr = *ipaddr;
2408         myhome.src_ipaddr.af = ipaddr->af;
2409         myhome.port = port;
2410 #ifdef WITH_TCP
2411         myhome.proto = proto;
2412 #else
2413         myhome.proto = IPPROTO_UDP;
2414 #endif
2415         myhome.server = NULL;   /* we're not called for internal proxying */
2416
2417         return rbtree_finddata(home_servers_byaddr, &myhome);
2418 }
2419
2420 #ifdef WITH_COA
2421 home_server_t *home_server_byname(char const *name, int type)
2422 {
2423         home_server_t myhome;
2424
2425         memset(&myhome, 0, sizeof(myhome));
2426         myhome.type = type;
2427         myhome.name = name;
2428
2429         return rbtree_finddata(home_servers_byname, &myhome);
2430 }
2431 #endif
2432
2433 #ifdef WITH_STATS
2434 home_server_t *home_server_bynumber(int number)
2435 {
2436         home_server_t myhome;
2437
2438         memset(&myhome, 0, sizeof(myhome));
2439         myhome.number = number;
2440         myhome.server = NULL;   /* we're not called for internal proxying */
2441
2442         return rbtree_finddata(home_servers_bynumber, &myhome);
2443 }
2444 #endif
2445
2446 home_pool_t *home_pool_byname(char const *name, int type)
2447 {
2448         home_pool_t mypool;
2449
2450         memset(&mypool, 0, sizeof(mypool));
2451         mypool.name = name;
2452         mypool.server_type = type;
2453         return rbtree_finddata(home_pools_byname, &mypool);
2454 }
2455
2456 #endif