src/main/listen.c

   1 /*
   2  * listen.c     Handle socket stuff
   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 2005,2006  The FreeRADIUS server project
  21  * Copyright 2005  Alan DeKok <aland@ox.org>
  22  */
  23
  24 #include <freeradius-devel/ident.h>
  25 RCSID("$Id$")
  26
  27 #include <freeradius-devel/radiusd.h>
  28 #include <freeradius-devel/modules.h>
  29 #include <freeradius-devel/rad_assert.h>
  30 #include <freeradius-devel/vqp.h>
  31 #include <freeradius-devel/dhcp.h>
  32
  33 #include <freeradius-devel/vmps.h>
  34 #include <freeradius-devel/detail.h>
  35
  36 #ifdef HAVE_SYS_RESOURCE_H
  37 #include <sys/resource.h>
  38 #endif
  39
  40 #ifdef HAVE_NET_IF_H
  41 #include <net/if.h>
  42 #endif
  43
  44 #ifdef HAVE_FCNTL_H
  45 #include <fcntl.h>
  46 #endif
  47
  48
  49 /*
  50  *      We'll use this below.
  51  */
  52 typedef int (*rad_listen_parse_t)(CONF_SECTION *, rad_listen_t *);
  53 typedef void (*rad_listen_free_t)(rad_listen_t *);
  54
  55 typedef struct rad_listen_master_t {
  56         rad_listen_parse_t      parse;
  57         rad_listen_free_t       free;
  58         rad_listen_recv_t       recv;
  59         rad_listen_send_t       send;
  60         rad_listen_print_t      print;
  61         rad_listen_encode_t     encode;
  62         rad_listen_decode_t     decode;
  63 } rad_listen_master_t;
  64
  65 typedef struct listen_socket_t {
  66         /*
  67          *      For normal sockets.
  68          */
  69         fr_ipaddr_t     ipaddr;
  70         int             port;
  71 #ifdef SO_BINDTODEVICE
  72         const char              *interface;
  73 #endif
  74         RADCLIENT_LIST  *clients;
  75 } listen_socket_t;
  76
  77 static rad_listen_t *listen_alloc(RAD_LISTEN_TYPE type);
  78
  79 /*
  80  *      Find a per-socket client.
  81  */
  82 RADCLIENT *client_listener_find(const rad_listen_t *listener,
  83                                 const fr_ipaddr_t *ipaddr, int src_port)
  84 {
  85 #ifdef WITH_DYNAMIC_CLIENTS
  86         int rcode;
  87         listen_socket_t *sock;
  88         REQUEST *request;
  89         RADCLIENT *created;
  90 #endif
  91         time_t now;
  92         RADCLIENT *client;
  93         RADCLIENT_LIST *clients;
  94
  95         rad_assert(listener != NULL);
  96         rad_assert(ipaddr != NULL);
  97
  98         rad_assert((listener->type == RAD_LISTEN_AUTH)
  99 #ifdef WITH_STATS
 100                    || (listener->type == RAD_LISTEN_NONE)
 101 #endif
 102 #ifdef WITH_ACCOUNTING
 103                    || (listener->type == RAD_LISTEN_ACCT)
 104 #endif
 105 #ifdef WITH_VMPS
 106                    || (listener->type == RAD_LISTEN_VQP)
 107 #endif
 108 #ifdef WITH_DHCP
 109                    || (listener->type == RAD_LISTEN_DHCP)
 110 #endif
 111                    );
 112
 113         clients = ((listen_socket_t *)listener->data)->clients;
 114
 115         /*
 116          *      This HAS to have been initialized previously.
 117          */
 118         rad_assert(clients != NULL);
 119
 120         client = client_find(clients, ipaddr);
 121         if (!client) {
 122                 static time_t last_printed = 0;
 123                 char name[256], buffer[128];
 124
 125 #ifdef WITH_DYNAMIC_CLIENTS
 126         unknown:                /* used only for dynamic clients */
 127 #endif
 128
 129                 /*
 130                  *      DoS attack quenching, but only in debug mode.
 131                  *      If they're running in debug mode, show them
 132                  *      every packet.
 133                  */
 134                 if (debug_flag == 0) {
 135                         now = time(NULL);
 136                         if (last_printed == now) return NULL;
 137
 138                         last_printed = now;
 139                 }
 140
 141                 listener->print(listener, name, sizeof(name));
 142
 143                 radlog(L_ERR, "Ignoring request to %s from unknown client %s port %d",
 144                        name, inet_ntop(ipaddr->af, &ipaddr->ipaddr,
 145                                        buffer, sizeof(buffer)),
 146                        src_port);
 147                 return NULL;
 148         }
 149
 150 #ifndef WITH_DYNAMIC_CLIENTS
 151         return client;          /* return the found client. */
 152 #else
 153
 154         /*
 155          *      No server defined, and it's not dynamic.  Return it.
 156          */
 157         if (!client->client_server && !client->dynamic) return client;
 158
 159         now = time(NULL);
 160
 161         /*
 162          *      It's a dynamically generated client, check it.
 163          */
 164         if (client->dynamic) {
 165                 /*
 166                  *      Lives forever.  Return it.
 167                  */
 168                 if (client->lifetime == 0) return client;
 169
 170                 /*
 171                  *      Rate-limit the deletion of known clients.
 172                  *      This makes them last a little longer, but
 173                  *      prevents the server from melting down if (say)
 174                  *      10k clients all expire at once.
 175                  */
 176                 if (now == client->last_new_client) return client;
 177
 178                 /*
 179                  *      It's not dead yet.  Return it.
 180                  */
 181                 if ((client->created + client->lifetime) > now) return client;
 182
 183                 /*
 184                  *      FIXME: Don't delete it until after the last
 185                  *      request using it has expired.  i.e. keep a
 186                  *      "use counter" (ugh).  Why can't we use a
 187                  *      language with garbage collection?
 188                  *
 189                  */
 190                 client_delete(clients, client);
 191
 192                 /*
 193                  *      Go find the enclosing network again.
 194                  */
 195                 client = client_find(clients, ipaddr);
 196
 197                 /*
 198                  *      WTF?
 199                  */
 200                 if (!client) goto unknown;
 201                 if (!client->client_server) goto unknown;
 202
 203                 /*
 204                  *      At this point, 'client' is the enclosing
 205                  *      network that configures where dynamic clients
 206                  *      can be defined.
 207                  */
 208                 rad_assert(client->dynamic == 0);
 209         } else {
 210                 /*
 211                  *      The IP is unknown, so we've found an enclosing
 212                  *      network.  Enable DoS protection.  We only
 213                  *      allow one new client per second.  Known
 214                  *      clients aren't subject to this restriction.
 215                  */
 216                 if (now == client->last_new_client) goto unknown;
 217         }
 218
 219         client->last_new_client = now;
 220
 221         request = request_alloc();
 222         if (!request) goto unknown;
 223
 224         request->listener = listener;
 225         request->client = client;
 226         request->packet = rad_alloc(0);
 227         if (!request->packet) {
 228                 request_free(&request);
 229                 goto unknown;
 230         }
 231         request->reply = rad_alloc(0);
 232         if (!request->reply) {
 233                 request_free(&request);
 234                 goto unknown;
 235         }
 236         request->packet->timestamp = request->timestamp;
 237         request->number = 0;
 238         request->priority = listener->type;
 239         request->server = client->client_server;
 240         request->root = &mainconfig;
 241
 242         /*
 243          *      Run a fake request through the given virtual server.
 244          *      Look for FreeRADIUS-Client-IP-Address
 245          *               FreeRADIUS-Client-Secret
 246          *              ...
 247          *
 248          *      and create the RADCLIENT structure from that.
 249          */
 250
 251         sock = listener->data;
 252         request->packet->sockfd = listener->fd;
 253         request->packet->src_ipaddr = *ipaddr;
 254         request->packet->src_port = 0; /* who cares... */
 255         request->packet->dst_ipaddr = sock->ipaddr;
 256         request->packet->dst_port = sock->port;
 257
 258         request->reply->sockfd = request->packet->sockfd;
 259         request->reply->dst_ipaddr = request->packet->src_ipaddr;
 260         request->reply->src_ipaddr = request->packet->dst_ipaddr;
 261         request->reply->dst_port = request->packet->src_port;
 262         request->reply->src_port = request->packet->dst_port;
 263         request->reply->id = request->packet->id;
 264         request->reply->code = 0; /* UNKNOWN code */
 265
 266
 267         DEBUG("server %s {", request->server);
 268
 269         rcode = module_authorize(0, request);
 270
 271         DEBUG("} # server %s", request->server);
 272
 273         if (rcode != RLM_MODULE_OK) {
 274                 request_free(&request);
 275                 goto unknown;
 276         }
 277
 278         /*
 279          *      If the client was updated by rlm_dynamic_clients,
 280          *      don't create the client from attribute-value pairs.
 281          */
 282         if (request->client == client) {
 283                 created = client_create(clients, request);
 284         } else {
 285                 created = request->client;
 286
 287                 /*
 288                  *      This frees the client if it isn't valid.
 289                  */
 290                 if (!client_validate(clients, client, created)) goto unknown;
 291         }
 292         request_free(&request);
 293
 294         if (!created) goto unknown;
 295
 296         return created;
 297 #endif
 298 }
 299
 300 static int listen_bind(rad_listen_t *this);
 301
 302
 303 /*
 304  *      Process and reply to a server-status request.
 305  *      Like rad_authenticate and rad_accounting this should
 306  *      live in it's own file but it's so small we don't bother.
 307  */
 308 static int rad_status_server(REQUEST *request)
 309 {
 310         int rcode = RLM_MODULE_OK;
 311         DICT_VALUE *dval;
 312
 313         switch (request->listener->type) {
 314 #ifdef WITH_STATS
 315         case RAD_LISTEN_NONE:
 316 #endif
 317         case RAD_LISTEN_AUTH:
 318                 dval = dict_valbyname(PW_AUTZ_TYPE, "Status-Server");
 319                 if (dval) {
 320                         rcode = module_authorize(dval->value, request);
 321                 } else {
 322                         rcode = RLM_MODULE_OK;
 323                 }
 324
 325                 switch (rcode) {
 326                 case RLM_MODULE_OK:
 327                 case RLM_MODULE_UPDATED:
 328                         request->reply->code = PW_AUTHENTICATION_ACK;
 329                         break;
 330
 331                 case RLM_MODULE_FAIL:
 332                 case RLM_MODULE_HANDLED:
 333                         request->reply->code = 0; /* don't reply */
 334                         break;
 335
 336                 default:
 337                 case RLM_MODULE_REJECT:
 338                         request->reply->code = PW_AUTHENTICATION_REJECT;
 339                         break;
 340                 }
 341                 break;
 342
 343 #ifdef WITH_ACCOUNTING
 344         case RAD_LISTEN_ACCT:
 345                 dval = dict_valbyname(PW_ACCT_TYPE, "Status-Server");
 346                 if (dval) {
 347                         rcode = module_accounting(dval->value, request);
 348                 } else {
 349                         rcode = RLM_MODULE_OK;
 350                 }
 351
 352                 switch (rcode) {
 353                 case RLM_MODULE_OK:
 354                 case RLM_MODULE_UPDATED:
 355                         request->reply->code = PW_ACCOUNTING_RESPONSE;
 356                         break;
 357
 358                 default:
 359                         request->reply->code = 0; /* don't reply */
 360                         break;
 361                 }
 362                 break;
 363 #endif
 364
 365         default:
 366                 return 0;
 367         }
 368
 369 #ifdef WITH_STATS
 370         /*
 371          *      Full statistics are available only on a statistics
 372          *      socket.
 373          */
 374         if (request->listener->type == RAD_LISTEN_NONE) {
 375                 request_stats_reply(request);
 376         }
 377 #endif
 378
 379         return 0;
 380 }
 381
 382
 383 static int socket_print(rad_listen_t *this, char *buffer, size_t bufsize)
 384 {
 385         size_t len;
 386         listen_socket_t *sock = this->data;
 387         const char *name;
 388
 389         switch (this->type) {
 390 #ifdef WITH_STATS
 391         case RAD_LISTEN_NONE:   /* what a hack... */
 392                 name = "status";
 393                 break;
 394 #endif
 395
 396         case RAD_LISTEN_AUTH:
 397                 name = "authentication";
 398                 break;
 399
 400 #ifdef WITH_ACCOUNTING
 401         case RAD_LISTEN_ACCT:
 402                 name = "accounting";
 403                 break;
 404 #endif
 405
 406 #ifdef WITH_PROXY
 407         case RAD_LISTEN_PROXY:
 408                 name = "proxy";
 409                 break;
 410 #endif
 411
 412 #ifdef WITH_VMPS
 413         case RAD_LISTEN_VQP:
 414                 name = "vmps";
 415                 break;
 416 #endif
 417
 418 #ifdef WITH_DHCP
 419         case RAD_LISTEN_DHCP:
 420                 name = "dhcp";
 421                 break;
 422 #endif
 423
 424         default:
 425                 name = "??";
 426                 break;
 427         }
 428
 429 #define FORWARD len = strlen(buffer); if (len >= (bufsize + 1)) return 0;buffer += len;bufsize -= len
 430 #define ADDSTRING(_x) strlcpy(buffer, _x, bufsize);FORWARD
 431
 432         ADDSTRING(name);
 433
 434 #ifdef SO_BINDTODEVICE
 435         if (sock->interface) {
 436                 ADDSTRING(" interface ");
 437                 ADDSTRING(sock->interface);
 438         }
 439 #endif
 440
 441         ADDSTRING(" address ");
 442
 443         if ((sock->ipaddr.af == AF_INET) &&
 444             (sock->ipaddr.ipaddr.ip4addr.s_addr == htonl(INADDR_ANY))) {
 445                 strlcpy(buffer, "*", bufsize);
 446         } else {
 447                 ip_ntoh(&sock->ipaddr, buffer, bufsize);
 448         }
 449         FORWARD;
 450
 451         ADDSTRING(" port ");
 452         snprintf(buffer, bufsize, "%d", sock->port);
 453         FORWARD;
 454
 455         if (this->server) {
 456                 ADDSTRING(" as server ");
 457                 ADDSTRING(this->server);
 458         }
 459
 460 #undef ADDSTRING
 461 #undef FORWARD
 462
 463         return 1;
 464 }
 465
 466
 467 /*
 468  *      Parse an authentication or accounting socket.
 469  */
 470 static int common_socket_parse(CONF_SECTION *cs, rad_listen_t *this)
 471 {
 472         int             rcode;
 473         int             listen_port;
 474         fr_ipaddr_t     ipaddr;
 475         listen_socket_t *sock = this->data;
 476         char            *section_name = NULL;
 477         CONF_SECTION    *client_cs, *parentcs;
 478
 479         /*
 480          *      Try IPv4 first
 481          */
 482         ipaddr.ipaddr.ip4addr.s_addr = htonl(INADDR_NONE);
 483         rcode = cf_item_parse(cs, "ipaddr", PW_TYPE_IPADDR,
 484                               &ipaddr.ipaddr.ip4addr, NULL);
 485         if (rcode < 0) return -1;
 486
 487         if (rcode == 0) { /* successfully parsed IPv4 */
 488                 ipaddr.af = AF_INET;
 489
 490         } else {        /* maybe IPv6? */
 491                 rcode = cf_item_parse(cs, "ipv6addr", PW_TYPE_IPV6ADDR,
 492                                       &ipaddr.ipaddr.ip6addr, NULL);
 493                 if (rcode < 0) return -1;
 494
 495                 if (rcode == 1) {
 496                         cf_log_err(cf_sectiontoitem(cs),
 497                                    "No address specified in listen section");
 498                         return -1;
 499                 }
 500                 ipaddr.af = AF_INET6;
 501         }
 502
 503         rcode = cf_item_parse(cs, "port", PW_TYPE_INTEGER,
 504                               &listen_port, "0");
 505         if (rcode < 0) return -1;
 506
 507         if ((listen_port < 0) || (listen_port > 65535)) {
 508                         cf_log_err(cf_sectiontoitem(cs),
 509                                    "Invalid value for \"port\"");
 510                         return -1;
 511         }
 512
 513         sock->ipaddr = ipaddr;
 514         sock->port = listen_port;
 515
 516         /*
 517          *      If we can bind to interfaces, do so,
 518          *      else don't.
 519          */
 520         if (cf_pair_find(cs, "interface")) {
 521 #ifndef SO_BINDTODEVICE
 522                 cf_log_err(cf_sectiontoitem(cs),
 523                            "System does not support binding to interfaces.  Delete this line from the configuration file.");
 524                 return -1;
 525 #else
 526                 const char *value;
 527                 CONF_PAIR *cp = cf_pair_find(cs, "interface");
 528
 529                 rad_assert(cp != NULL);
 530                 value = cf_pair_value(cp);
 531                 if (!value) {
 532                         cf_log_err(cf_sectiontoitem(cs),
 533                                    "No interface name given");
 534                         return -1;
 535                 }
 536                 sock->interface = value;
 537 #endif
 538         }
 539
 540         /*
 541          *      And bind it to the port.
 542          */
 543         if (listen_bind(this) < 0) {
 544                 char buffer[128];
 545                 cf_log_err(cf_sectiontoitem(cs),
 546                            "Error binding to port for %s port %d",
 547                            ip_ntoh(&sock->ipaddr, buffer, sizeof(buffer)),
 548                            sock->port);
 549                 return -1;
 550         }
 551
 552 #ifdef WITH_PROXY
 553         /*
 554          *      Proxy sockets don't have clients.
 555          */
 556         if (this->type == RAD_LISTEN_PROXY) return 0;
 557 #endif
 558
 559         /*
 560          *      The more specific configurations are preferred to more
 561          *      generic ones.
 562          */
 563         client_cs = NULL;
 564         parentcs = cf_top_section(cs);
 565         rcode = cf_item_parse(cs, "clients", PW_TYPE_STRING_PTR,
 566                               &section_name, NULL);
 567         if (rcode < 0) return -1; /* bad string */
 568         if (rcode == 0) {
 569                 /*
 570                  *      Explicit list given: use it.
 571                  */
 572                 client_cs = cf_section_sub_find_name2(parentcs,
 573                                                       "clients",
 574                                                       section_name);
 575                 if (!client_cs) {
 576                         client_cs = cf_section_find(section_name);
 577                 }
 578                 if (!client_cs) {
 579                         cf_log_err(cf_sectiontoitem(cs),
 580                                    "Failed to find clients %s {...}",
 581                                    section_name);
 582                         free(section_name);
 583                         return -1;
 584                 }
 585                 free(section_name);
 586         } /* else there was no "clients = " entry. */
 587
 588         if (!client_cs) {
 589                 CONF_SECTION *server_cs;
 590
 591                 server_cs = cf_section_sub_find_name2(parentcs,
 592                                                       "server",
 593                                                       this->server);
 594                 /*
 595                  *      Found a "server foo" section.  If there are clients
 596                  *      in it, use them.
 597                  */
 598                 if (server_cs &&
 599                     (cf_section_sub_find(server_cs, "client") != NULL)) {
 600                         client_cs = server_cs;
 601                 }
 602         }
 603
 604         /*
 605          *      Still nothing.  Look for global clients.
 606          */
 607         if (!client_cs) client_cs = parentcs;
 608
 609         sock->clients = clients_parse_section(client_cs);
 610         if (!sock->clients) {
 611                 cf_log_err(cf_sectiontoitem(cs),
 612                            "Failed to load clients for this listen section");
 613                 return -1;
 614         }
 615
 616         return 0;
 617 }
 618
 619 /*
 620  *      Send an authentication response packet
 621  */
 622 static int auth_socket_send(rad_listen_t *listener, REQUEST *request)
 623 {
 624         rad_assert(request->listener == listener);
 625         rad_assert(listener->send == auth_socket_send);
 626
 627         return rad_send(request->reply, request->packet,
 628                         request->client->secret);
 629 }
 630
 631
 632 #ifdef WITH_ACCOUNTING
 633 /*
 634  *      Send an accounting response packet (or not)
 635  */
 636 static int acct_socket_send(rad_listen_t *listener, REQUEST *request)
 637 {
 638         rad_assert(request->listener == listener);
 639         rad_assert(listener->send == acct_socket_send);
 640
 641         /*
 642          *      Accounting reject's are silently dropped.
 643          *
 644          *      We do it here to avoid polluting the rest of the
 645          *      code with this knowledge
 646          */
 647         if (request->reply->code == 0) return 0;
 648
 649         return rad_send(request->reply, request->packet,
 650                         request->client->secret);
 651 }
 652 #endif
 653
 654 #ifdef WITH_PROXY
 655 /*
 656  *      Send a packet to a home server.
 657  *
 658  *      FIXME: have different code for proxy auth & acct!
 659  */
 660 static int proxy_socket_send(rad_listen_t *listener, REQUEST *request)
 661 {
 662         listen_socket_t *sock = listener->data;
 663
 664         rad_assert(request->proxy_listener == listener);
 665         rad_assert(listener->send == proxy_socket_send);
 666
 667         request->proxy->src_ipaddr = sock->ipaddr;
 668         request->proxy->src_port = sock->port;
 669
 670         return rad_send(request->proxy, request->packet,
 671                         request->home_server->secret);
 672 }
 673 #endif
 674
 675 #ifdef WITH_STATS
 676 /*
 677  *      Check if an incoming request is "ok"
 678  *
 679  *      It takes packets, not requests.  It sees if the packet looks
 680  *      OK.  If so, it does a number of sanity checks on it.
 681   */
 682 static int stats_socket_recv(rad_listen_t *listener,
 683                             RAD_REQUEST_FUNP *pfun, REQUEST **prequest)
 684 {
 685         ssize_t         rcode;
 686         int             code, src_port;
 687         RADIUS_PACKET   *packet;
 688         RADCLIENT       *client;
 689         fr_ipaddr_t     src_ipaddr;
 690
 691         rcode = rad_recv_header(listener->fd, &src_ipaddr, &src_port, &code);
 692         if (rcode < 0) return 0;
 693
 694         RAD_STATS_TYPE_INC(listener, total_requests);
 695
 696         if (rcode < 20) {       /* AUTH_HDR_LEN */
 697                 RAD_STATS_TYPE_INC(listener, total_malformed_requests);
 698                 return 0;
 699         }
 700
 701         if ((client = client_listener_find(listener,
 702                                            &src_ipaddr, src_port)) == NULL) {
 703                 rad_recv_discard(listener->fd);
 704                 RAD_STATS_TYPE_INC(listener, total_invalid_requests);
 705                 return 0;
 706         }
 707
 708         /*
 709          *      We only understand Status-Server on this socket.
 710          */
 711         if (code != PW_STATUS_SERVER) {
 712                 DEBUG("Ignoring packet code %d sent to Status-Server port",
 713                       code);
 714                 rad_recv_discard(listener->fd);
 715                 RAD_STATS_TYPE_INC(listener, total_unknown_types);
 716                 RAD_STATS_CLIENT_INC(listener, client, total_unknown_types);
 717                 return 0;
 718         }
 719
 720         /*
 721          *      Now that we've sanity checked everything, receive the
 722          *      packet.
 723          */
 724         packet = rad_recv(listener->fd, 1); /* require message authenticator */
 725         if (!packet) {
 726                 RAD_STATS_TYPE_INC(listener, total_malformed_requests);
 727                 DEBUG("%s", fr_strerror());
 728                 return 0;
 729         }
 730
 731         if (!received_request(listener, packet, prequest, client)) {
 732                 RAD_STATS_TYPE_INC(listener, total_packets_dropped);
 733                 RAD_STATS_CLIENT_INC(listener, client, total_packets_dropped);
 734                 rad_free(&packet);
 735                 return 0;
 736         }
 737
 738         *pfun = rad_status_server;
 739         return 1;
 740 }
 741 #endif
 742
 743
 744 /*
 745  *      Check if an incoming request is "ok"
 746  *
 747  *      It takes packets, not requests.  It sees if the packet looks
 748  *      OK.  If so, it does a number of sanity checks on it.
 749   */
 750 static int auth_socket_recv(rad_listen_t *listener,
 751                             RAD_REQUEST_FUNP *pfun, REQUEST **prequest)
 752 {
 753         ssize_t         rcode;
 754         int             code, src_port;
 755         RADIUS_PACKET   *packet;
 756         RAD_REQUEST_FUNP fun = NULL;
 757         RADCLIENT       *client;
 758         fr_ipaddr_t     src_ipaddr;
 759
 760         rcode = rad_recv_header(listener->fd, &src_ipaddr, &src_port, &code);
 761         if (rcode < 0) return 0;
 762
 763         RAD_STATS_TYPE_INC(listener, total_requests);
 764
 765         if (rcode < 20) {       /* AUTH_HDR_LEN */
 766                 RAD_STATS_TYPE_INC(listener, total_malformed_requests);
 767                 return 0;
 768         }
 769
 770         if ((client = client_listener_find(listener,
 771                                            &src_ipaddr, src_port)) == NULL) {
 772                 rad_recv_discard(listener->fd);
 773                 RAD_STATS_TYPE_INC(listener, total_invalid_requests);
 774                 return 0;
 775         }
 776
 777         /*
 778          *      Some sanity checks, based on the packet code.
 779          */
 780         switch(code) {
 781         case PW_AUTHENTICATION_REQUEST:
 782                 RAD_STATS_CLIENT_INC(listener, client, total_requests);
 783                 fun = rad_authenticate;
 784                 break;
 785
 786         case PW_STATUS_SERVER:
 787                 if (!mainconfig.status_server) {
 788                         rad_recv_discard(listener->fd);
 789                         RAD_STATS_TYPE_INC(listener, total_packets_dropped);
 790                         RAD_STATS_CLIENT_INC(listener, client, total_packets_dropped);
 791                         DEBUG("WARNING: Ignoring Status-Server request due to security configuration");
 792                         return 0;
 793                 }
 794                 fun = rad_status_server;
 795                 break;
 796
 797         default:
 798                 rad_recv_discard(listener->fd);
 799                 RAD_STATS_INC(radius_auth_stats.total_unknown_types);
 800                 RAD_STATS_CLIENT_INC(listener, client, total_unknown_types);
 801
 802                 DEBUG("Invalid packet code %d sent to authentication port from client %s port %d : IGNORED",
 803                       code, client->shortname, src_port);
 804                 return 0;
 805                 break;
 806         } /* switch over packet types */
 807
 808         /*
 809          *      Now that we've sanity checked everything, receive the
 810          *      packet.
 811          */
 812         packet = rad_recv(listener->fd, client->message_authenticator);
 813         if (!packet) {
 814                 RAD_STATS_TYPE_INC(listener, total_malformed_requests);
 815                 DEBUG("%s", fr_strerror());
 816                 return 0;
 817         }
 818
 819         if (!received_request(listener, packet, prequest, client)) {
 820                 RAD_STATS_TYPE_INC(listener, total_packets_dropped);
 821                 RAD_STATS_CLIENT_INC(listener, client, total_packets_dropped);
 822                 rad_free(&packet);
 823                 return 0;
 824         }
 825
 826         *pfun = fun;
 827         return 1;
 828 }
 829
 830
 831 #ifdef WITH_ACCOUNTING
 832 /*
 833  *      Receive packets from an accounting socket
 834  */
 835 static int acct_socket_recv(rad_listen_t *listener,
 836                             RAD_REQUEST_FUNP *pfun, REQUEST **prequest)
 837 {
 838         ssize_t         rcode;
 839         int             code, src_port;
 840         RADIUS_PACKET   *packet;
 841         RAD_REQUEST_FUNP fun = NULL;
 842         RADCLIENT       *client;
 843         fr_ipaddr_t     src_ipaddr;
 844
 845         rcode = rad_recv_header(listener->fd, &src_ipaddr, &src_port, &code);
 846         if (rcode < 0) return 0;
 847
 848         RAD_STATS_TYPE_INC(listener, total_requests);
 849
 850         if (rcode < 20) {       /* AUTH_HDR_LEN */
 851                 RAD_STATS_TYPE_INC(listener, total_malformed_requests);
 852                 return 0;
 853         }
 854
 855         if ((client = client_listener_find(listener,
 856                                            &src_ipaddr, src_port)) == NULL) {
 857                 rad_recv_discard(listener->fd);
 858                 RAD_STATS_TYPE_INC(listener, total_invalid_requests);
 859                 return 0;
 860         }
 861
 862         /*
 863          *      Some sanity checks, based on the packet code.
 864          */
 865         switch(code) {
 866         case PW_ACCOUNTING_REQUEST:
 867                 RAD_STATS_CLIENT_INC(listener, client, total_requests);
 868                 fun = rad_accounting;
 869                 break;
 870
 871         case PW_STATUS_SERVER:
 872                 if (!mainconfig.status_server) {
 873                         rad_recv_discard(listener->fd);
 874                         RAD_STATS_TYPE_INC(listener, total_packets_dropped);
 875                         RAD_STATS_CLIENT_INC(listener, client, total_unknown_types);
 876
 877                         DEBUG("WARNING: Ignoring Status-Server request due to security configuration");
 878                         return 0;
 879                 }
 880                 fun = rad_status_server;
 881                 break;
 882
 883         default:
 884                 rad_recv_discard(listener->fd);
 885                 RAD_STATS_TYPE_INC(listener, total_unknown_types);
 886                 RAD_STATS_CLIENT_INC(listener, client, total_unknown_types);
 887
 888                 DEBUG("Invalid packet code %d sent to a accounting port from client %s port %d : IGNORED",
 889                       code, client->shortname, src_port);
 890                 return 0;
 891         } /* switch over packet types */
 892
 893         /*
 894          *      Now that we've sanity checked everything, receive the
 895          *      packet.
 896          */
 897         packet = rad_recv(listener->fd, 0);
 898         if (!packet) {
 899                 RAD_STATS_TYPE_INC(listener, total_malformed_requests);
 900                 radlog(L_ERR, "%s", fr_strerror());
 901                 return 0;
 902         }
 903
 904         /*
 905          *      There can be no duplicate accounting packets.
 906          */
 907         if (!received_request(listener, packet, prequest, client)) {
 908                 RAD_STATS_TYPE_INC(listener, total_packets_dropped);
 909                 RAD_STATS_CLIENT_INC(listener, client, total_packets_dropped);
 910                 rad_free(&packet);
 911                 return 0;
 912         }
 913
 914         *pfun = fun;
 915         return 1;
 916 }
 917 #endif
 918
 919
 920 #ifdef WITH_COA
 921 /*
 922  *      For now, all CoA requests are *only* originated, and not
 923  *      proxied.  So all of the necessary work is done in the
 924  *      post-proxy section, which is automatically handled by event.c.
 925  *      As a result, we don't have to do anything here.
 926  */
 927 static int rad_coa_reply(REQUEST *request)
 928 {
 929         VALUE_PAIR *s1, *s2;
 930
 931         /*
 932          *      Inform the user about RFC requirements.
 933          */
 934         s1 = pairfind(request->proxy->vps, PW_STATE);
 935         if (s1) {
 936                 s2 = pairfind(request->proxy_reply->vps, PW_STATE);
 937
 938                 if (!s2) {
 939                         DEBUG("WARNING: Client was sent State in CoA, and did not respond with State.");
 940
 941                 } else if ((s1->length != s2->length) ||
 942                            (memcmp(s1->vp_octets, s2->vp_octets,
 943                                    s1->length) != 0)) {
 944                         DEBUG("WARNING: Client was sent State in CoA, and did not respond with the same State.");
 945                 }
 946         }
 947
 948         return RLM_MODULE_OK;
 949 }
 950 #endif
 951
 952 #ifdef WITH_PROXY
 953 /*
 954  *      Recieve packets from a proxy socket.
 955  */
 956 static int proxy_socket_recv(rad_listen_t *listener,
 957                               RAD_REQUEST_FUNP *pfun, REQUEST **prequest)
 958 {
 959         REQUEST         *request;
 960         RADIUS_PACKET   *packet;
 961         RAD_REQUEST_FUNP fun = NULL;
 962         char            buffer[128];
 963
 964         packet = rad_recv(listener->fd, 0);
 965         if (!packet) {
 966                 radlog(L_ERR, "%s", fr_strerror());
 967                 return 0;
 968         }
 969
 970         /*
 971          *      FIXME: Client MIB updates?
 972          */
 973         switch(packet->code) {
 974         case PW_AUTHENTICATION_ACK:
 975         case PW_ACCESS_CHALLENGE:
 976         case PW_AUTHENTICATION_REJECT:
 977                 fun = rad_authenticate;
 978                 break;
 979
 980 #ifdef WITH_ACCOUNTING
 981         case PW_ACCOUNTING_RESPONSE:
 982                 fun = rad_accounting;
 983                 break;
 984 #endif
 985
 986 #ifdef WITH_COA
 987         case PW_DISCONNECT_ACK:
 988         case PW_DISCONNECT_NAK:
 989         case PW_COA_ACK:
 990         case PW_COA_NAK:
 991                 fun = rad_coa_reply;
 992                 break;
 993 #endif
 994
 995         default:
 996                 /*
 997                  *      FIXME: Update MIB for packet types?
 998                  */
 999                 radlog(L_ERR, "Invalid packet code %d sent to a proxy port "
1000                        "from home server %s port %d - ID %d : IGNORED",
1001                        packet->code,
1002                        ip_ntoh(&packet->src_ipaddr, buffer, sizeof(buffer)),
1003                        packet->src_port, packet->id);
1004                 rad_free(&packet);
1005                 return 0;
1006         }
1007
1008         request = received_proxy_response(packet);
1009         if (!request) {
1010                 rad_free(&packet);
1011                 return 0;
1012         }
1013
1014         rad_assert(fun != NULL);
1015         *pfun = fun;
1016         *prequest = request;
1017
1018         return 1;
1019 }
1020 #endif
1021
1022
1023 static int client_socket_encode(UNUSED rad_listen_t *listener, REQUEST *request)
1024 {
1025         if (!request->reply->code) return 0;
1026
1027         rad_encode(request->reply, request->packet,
1028                    request->client->secret);
1029         rad_sign(request->reply, request->packet,
1030                  request->client->secret);
1031
1032         return 0;
1033 }
1034
1035
1036 static int client_socket_decode(UNUSED rad_listen_t *listener, REQUEST *request)
1037 {
1038         if (rad_verify(request->packet, NULL,
1039                        request->client->secret) < 0) {
1040                 return -1;
1041         }
1042
1043         return rad_decode(request->packet, NULL,
1044                           request->client->secret);
1045 }
1046
1047 #ifdef WITH_PROXY
1048 static int proxy_socket_encode(UNUSED rad_listen_t *listener, REQUEST *request)
1049 {
1050         rad_encode(request->proxy, NULL, request->home_server->secret);
1051         rad_sign(request->proxy, NULL, request->home_server->secret);
1052
1053         return 0;
1054 }
1055
1056
1057 static int proxy_socket_decode(UNUSED rad_listen_t *listener, REQUEST *request)
1058 {
1059         if (rad_verify(request->proxy_reply, request->proxy,
1060                        request->home_server->secret) < 0) {
1061                 return -1;
1062         }
1063
1064         return rad_decode(request->proxy_reply, request->proxy,
1065                            request->home_server->secret);
1066 }
1067 #endif
1068
1069 #include "dhcpd.c"
1070
1071 #include "command.c"
1072
1073 static const rad_listen_master_t master_listen[RAD_LISTEN_MAX] = {
1074 #ifdef WITH_STATS
1075         { common_socket_parse, NULL,
1076           stats_socket_recv, auth_socket_send,
1077           socket_print, client_socket_encode, client_socket_decode },
1078 #else
1079         /*
1080          *      This always gets defined.
1081          */
1082         { NULL, NULL, NULL, NULL, NULL, NULL, NULL},    /* RAD_LISTEN_NONE */
1083 #endif
1084
1085 #ifdef WITH_PROXY
1086         /* proxying */
1087         { common_socket_parse, NULL,
1088           proxy_socket_recv, proxy_socket_send,
1089           socket_print, proxy_socket_encode, proxy_socket_decode },
1090 #endif
1091
1092         /* authentication */
1093         { common_socket_parse, NULL,
1094           auth_socket_recv, auth_socket_send,
1095           socket_print, client_socket_encode, client_socket_decode },
1096
1097 #ifdef WITH_ACCOUNTING
1098         /* accounting */
1099         { common_socket_parse, NULL,
1100           acct_socket_recv, acct_socket_send,
1101           socket_print, client_socket_encode, client_socket_decode},
1102 #endif
1103
1104 #ifdef WITH_DETAIL
1105         /* detail */
1106         { detail_parse, detail_free,
1107           detail_recv, detail_send,
1108           detail_print, detail_encode, detail_decode },
1109 #endif
1110
1111 #ifdef WITH_VMPS
1112         /* vlan query protocol */
1113         { common_socket_parse, NULL,
1114           vqp_socket_recv, vqp_socket_send,
1115           socket_print, vqp_socket_encode, vqp_socket_decode },
1116 #endif
1117
1118 #ifdef WITH_DHCP
1119         /* dhcp query protocol */
1120         { dhcp_socket_parse, NULL,
1121           dhcp_socket_recv, dhcp_socket_send,
1122           socket_print, dhcp_socket_encode, dhcp_socket_decode },
1123 #endif
1124
1125 #ifdef WITH_COMMAND_SOCKET
1126         /* TCP command socket */
1127         { command_socket_parse, NULL,
1128           command_domain_accept, command_domain_send,
1129           command_socket_print, command_socket_encode, command_socket_decode },
1130 #endif
1131
1132 };
1133
1134
1135
1136 /*
1137  *      Binds a listener to a socket.
1138  */
1139 static int listen_bind(rad_listen_t *this)
1140 {
1141         int rcode;
1142         struct sockaddr_storage salocal;
1143         socklen_t       salen;
1144         listen_socket_t *sock = this->data;
1145
1146         /*
1147          *      If the port is zero, then it means the appropriate
1148          *      thing from /etc/services.
1149          */
1150         if (sock->port == 0) {
1151                 struct servent  *svp;
1152
1153                 switch (this->type) {
1154                 case RAD_LISTEN_AUTH:
1155                         svp = getservbyname ("radius", "udp");
1156                         if (svp != NULL) {
1157                                 sock->port = ntohs(svp->s_port);
1158                         } else {
1159                                 sock->port = PW_AUTH_UDP_PORT;
1160                         }
1161                         break;
1162
1163 #ifdef WITH_ACCOUNTING
1164                 case RAD_LISTEN_ACCT:
1165                         svp = getservbyname ("radacct", "udp");
1166                         if (svp != NULL) {
1167                                 sock->port = ntohs(svp->s_port);
1168                         } else {
1169                                 sock->port = PW_ACCT_UDP_PORT;
1170                         }
1171                         break;
1172 #endif
1173
1174 #ifdef WITH_PROXY
1175                 case RAD_LISTEN_PROXY:
1176                         sock->port = 0;
1177                         break;
1178 #endif
1179
1180 #ifdef WITH_VMPS
1181                 case RAD_LISTEN_VQP:
1182                         sock->port = 1589;
1183                         break;
1184 #endif
1185
1186                 default:
1187                         radlog(L_ERR, "ERROR: Non-fatal internal sanity check failed in bind.");
1188                         return -1;
1189                 }
1190         }
1191
1192         /*
1193          *      Copy fr_socket() here, as we may need to bind to a device.
1194          */
1195         this->fd = socket(sock->ipaddr.af, SOCK_DGRAM, 0);
1196         if (this->fd < 0) {
1197                 radlog(L_ERR, "Failed opening socket: %s", strerror(errno));
1198                 return -1;
1199         }
1200
1201 #ifdef SO_BINDTODEVICE
1202         /*
1203          *      Bind to a device BEFORE touching IP addresses.
1204          */
1205         if (sock->interface) {
1206                 struct ifreq ifreq;
1207                 strcpy(ifreq.ifr_name, sock->interface);
1208
1209                 fr_suid_up();
1210                 rcode = setsockopt(this->fd, SOL_SOCKET, SO_BINDTODEVICE,
1211                                    (char *)&ifreq, sizeof(ifreq));
1212                 fr_suid_down();
1213                 if (rcode < 0) {
1214                         close(this->fd);
1215                         radlog(L_ERR, "Failed binding to interface %s: %s",
1216                                sock->interface, strerror(errno));
1217                         return -1;
1218                 } /* else it worked. */
1219         }
1220 #endif
1221
1222 #ifdef WITH_UDPFROMTO
1223         /*
1224          *      Initialize udpfromto for all sockets.
1225          */
1226         if (udpfromto_init(this->fd) != 0) {
1227                 close(this->fd);
1228                 return -1;
1229         }
1230 #endif
1231
1232         /*
1233          *      Set up sockaddr stuff.
1234          */
1235         if (!fr_ipaddr2sockaddr(&sock->ipaddr, sock->port, &salocal, &salen)) {
1236                 close(this->fd);
1237                 return -1;
1238         }
1239
1240 #ifdef HAVE_STRUCT_SOCKADDR_IN6
1241         if (sock->ipaddr.af == AF_INET6) {
1242                 /*
1243                  *      Listening on '::' does NOT get you IPv4 to
1244                  *      IPv6 mapping.  You've got to listen on an IPv4
1245                  *      address, too.  This makes the rest of the server
1246                  *      design a little simpler.
1247                  */
1248 #ifdef IPV6_V6ONLY
1249
1250                 if (IN6_IS_ADDR_UNSPECIFIED(&sock->ipaddr.ipaddr.ip6addr)) {
1251                         int on = 1;
1252
1253                         setsockopt(this->fd, IPPROTO_IPV6, IPV6_V6ONLY,
1254                                    (char *)&on, sizeof(on));
1255                 }
1256 #endif /* IPV6_V6ONLY */
1257         }
1258 #endif /* HAVE_STRUCT_SOCKADDR_IN6 */
1259
1260         /*
1261          *      May be binding to priviledged ports.
1262          */
1263         fr_suid_up();
1264         rcode = bind(this->fd, (struct sockaddr *) &salocal, salen);
1265         fr_suid_down();
1266         if (rcode < 0) {
1267                 close(this->fd);
1268                 radlog(L_ERR, "Failed binding to socket: %s\n",
1269                        strerror(errno));
1270                 return -1;
1271         }
1272
1273         /*
1274          *      FreeBSD jail issues.  We bind to 0.0.0.0, but the
1275          *      kernel instead binds us to a 1.2.3.4.  If this
1276          *      happens, notice, and remember our real IP.
1277          */
1278         {
1279                 struct sockaddr_storage src;
1280                 socklen_t               sizeof_src = sizeof(src);
1281
1282                 memset(&src, 0, sizeof_src);
1283                 if (getsockname(this->fd, (struct sockaddr *) &src,
1284                                 &sizeof_src) < 0) {
1285                         radlog(L_ERR, "Failed getting socket name: %s",
1286                                strerror(errno));
1287                         return -1;
1288                 }
1289
1290                 if (!fr_sockaddr2ipaddr(&src, sizeof_src,
1291                                         &sock->ipaddr, &sock->port)) {
1292                         radlog(L_ERR, "Socket has unsupported address family");
1293                         return -1;
1294                 }
1295         }
1296
1297 #ifdef O_NONBLOCK
1298         {
1299                 int flags;
1300
1301                 if ((flags = fcntl(this->fd, F_GETFL, NULL)) < 0)  {
1302                         radlog(L_ERR, "Failure getting socket flags: %s)\n",
1303                                strerror(errno));
1304                         return -1;
1305                 }
1306
1307                 flags |= O_NONBLOCK;
1308                 if( fcntl(this->fd, F_SETFL, flags) < 0) {
1309                         radlog(L_ERR, "Failure setting socket flags: %s)\n",
1310                                strerror(errno));
1311                         return -1;
1312                 }
1313         }
1314 #endif
1315
1316         return 0;
1317 }
1318
1319
1320 /*
1321  *      Allocate & initialize a new listener.
1322  */
1323 static rad_listen_t *listen_alloc(RAD_LISTEN_TYPE type)
1324 {
1325         rad_listen_t *this;
1326
1327         this = rad_malloc(sizeof(*this));
1328         memset(this, 0, sizeof(*this));
1329
1330         this->type = type;
1331         this->recv = master_listen[this->type].recv;
1332         this->send = master_listen[this->type].send;
1333         this->print = master_listen[this->type].print;
1334         this->encode = master_listen[this->type].encode;
1335         this->decode = master_listen[this->type].decode;
1336
1337         switch (type) {
1338 #ifdef WITH_STATS
1339         case RAD_LISTEN_NONE:
1340 #endif
1341         case RAD_LISTEN_AUTH:
1342 #ifdef WITH_ACCOUNTING
1343         case RAD_LISTEN_ACCT:
1344 #endif
1345 #ifdef WITH_PROXY
1346         case RAD_LISTEN_PROXY:
1347 #endif
1348 #ifdef WITH_VMPS
1349         case RAD_LISTEN_VQP:
1350 #endif
1351 #ifdef WITH_DHCP
1352         case RAD_LISTEN_DHCP:
1353 #endif
1354                 this->data = rad_malloc(sizeof(listen_socket_t));
1355                 memset(this->data, 0, sizeof(listen_socket_t));
1356                 break;
1357
1358 #ifdef WITH_DETAIL
1359         case RAD_LISTEN_DETAIL:
1360                 this->data = NULL;
1361                 break;
1362 #endif
1363
1364 #ifdef WITH_COMMAND_SOCKET
1365         case RAD_LISTEN_COMMAND:
1366                 this->data = rad_malloc(sizeof(fr_command_socket_t));
1367                 memset(this->data, 0, sizeof(fr_command_socket_t));
1368                 break;
1369 #endif
1370
1371         default:
1372                 rad_assert("Unsupported option!" == NULL);
1373                 break;
1374         }
1375
1376         return this;
1377 }
1378
1379
1380 #ifdef WITH_PROXY
1381 /*
1382  *      Externally visible function for creating a new proxy LISTENER.
1383  *
1384  *      For now, don't take ipaddr or port.
1385  *
1386  *      Not thread-safe, but all calls to it are protected by the
1387  *      proxy mutex in request_list.c
1388  */
1389 rad_listen_t *proxy_new_listener()
1390 {
1391         int last_proxy_port, port;
1392         rad_listen_t *this, *tmp, **last;
1393         listen_socket_t *sock, *old;
1394
1395         this = listen_alloc(RAD_LISTEN_PROXY);
1396
1397         /*
1398          *      Find an existing proxy socket to copy.
1399          *
1400          *      FIXME: Make it per-realm, or per-home server!
1401          */
1402         last_proxy_port = 0;
1403         old = NULL;
1404         last = &mainconfig.listen;
1405         for (tmp = mainconfig.listen; tmp != NULL; tmp = tmp->next) {
1406                 if (tmp->type == RAD_LISTEN_PROXY) {
1407                         sock = tmp->data;
1408                         if (sock->port > last_proxy_port) {
1409                                 last_proxy_port = sock->port + 1;
1410                         }
1411                         if (!old) old = sock;
1412                 }
1413
1414                 last = &(tmp->next);
1415         }
1416
1417         if (!old) {
1418                 listen_free(&this);
1419                 return NULL;    /* This is a serious error. */
1420         }
1421
1422         /*
1423          *      FIXME: find a new IP address to listen on?
1424          *
1425          *      This could likely be done in the "home server"
1426          *      configuration, to have per-home-server source IP's.
1427          */
1428         sock = this->data;
1429         memcpy(&sock->ipaddr, &old->ipaddr, sizeof(sock->ipaddr));
1430
1431         /*
1432          *      Keep going until we find an unused port.
1433          */
1434         for (port = last_proxy_port; port < 64000; port++) {
1435                 sock->port = port;
1436                 if (listen_bind(this) == 0) {
1437                         /*
1438                          *      Add the new listener to the list of
1439                          *      listeners.
1440                          */
1441                         *last = this;
1442                         return this;
1443                 }
1444         }
1445
1446         listen_free(&this);
1447         return NULL;
1448 }
1449 #endif
1450
1451 static const FR_NAME_NUMBER listen_compare[] = {
1452 #ifdef WITH_STATS
1453         { "status",     RAD_LISTEN_NONE },
1454 #endif
1455         { "auth",       RAD_LISTEN_AUTH },
1456 #ifdef WITH_ACCOUNTING
1457         { "acct",       RAD_LISTEN_ACCT },
1458 #endif
1459 #ifdef WITH_DETAIL
1460         { "detail",     RAD_LISTEN_DETAIL },
1461 #endif
1462 #ifdef WITH_PROXY
1463         { "proxy",      RAD_LISTEN_PROXY },
1464 #endif
1465 #ifdef WITH_VMPS
1466         { "vmps",       RAD_LISTEN_VQP },
1467 #endif
1468 #ifdef WITH_DHCP
1469         { "dhcp",       RAD_LISTEN_DHCP },
1470 #endif
1471 #ifdef WITH_COMMAND_SOCKET
1472         { "control",    RAD_LISTEN_COMMAND },
1473 #endif
1474         { NULL, 0 },
1475 };
1476
1477
1478 static rad_listen_t *listen_parse(CONF_SECTION *cs, const char *server)
1479 {
1480         int             type, rcode;
1481         char            *listen_type;
1482         rad_listen_t    *this;
1483
1484         listen_type = NULL;
1485
1486         cf_log_info(cs, "listen {");
1487
1488         rcode = cf_item_parse(cs, "type", PW_TYPE_STRING_PTR,
1489                               &listen_type, "");
1490         if (rcode < 0) return NULL;
1491         if (rcode == 1) {
1492                 free(listen_type);
1493                 cf_log_err(cf_sectiontoitem(cs),
1494                            "No type specified in listen section");
1495                 return NULL;
1496         }
1497
1498         type = fr_str2int(listen_compare, listen_type, -1);
1499         if (type < 0) {
1500                 cf_log_err(cf_sectiontoitem(cs),
1501                            "Invalid type \"%s\" in listen section.",
1502                            listen_type);
1503                 free(listen_type);
1504                 return NULL;
1505         }
1506         free(listen_type);
1507
1508         /*
1509          *      Allow listen sections in the default config to
1510          *      refer to a server.
1511          */
1512         if (!server) {
1513                 rcode = cf_item_parse(cs, "virtual_server", PW_TYPE_STRING_PTR,
1514                                       &server, NULL);
1515                 if (rcode == 1) { /* compatiblity with 2.0-pre */
1516                         rcode = cf_item_parse(cs, "server", PW_TYPE_STRING_PTR,
1517                                               &server, NULL);
1518                 }
1519                 if (rcode < 0) return NULL;
1520         }
1521
1522         /*
1523          *      Set up cross-type data.
1524          */
1525         this = listen_alloc(type);
1526         this->server = server;
1527         this->fd = -1;
1528
1529         /*
1530          *      Call per-type parser.
1531          */
1532         if (master_listen[type].parse(cs, this) < 0) {
1533                 listen_free(&this);
1534                 return NULL;
1535         }
1536
1537         cf_log_info(cs, "}");
1538
1539         return this;
1540 }
1541
1542 /*
1543  *      Generate a list of listeners.  Takes an input list of
1544  *      listeners, too, so we don't close sockets with waiting packets.
1545  */
1546 int listen_init(CONF_SECTION *config, rad_listen_t **head)
1547 {
1548         int             override = FALSE;
1549         int             rcode;
1550         CONF_SECTION    *cs = NULL;
1551         rad_listen_t    **last;
1552         rad_listen_t    *this;
1553         fr_ipaddr_t     server_ipaddr;
1554         int             auth_port = 0;
1555 #ifdef WITH_PROXY
1556         int             defined_proxy = 0;
1557 #endif
1558
1559         /*
1560          *      We shouldn't be called with a pre-existing list.
1561          */
1562         rad_assert(head && (*head == NULL));
1563
1564         last = head;
1565         server_ipaddr.af = AF_UNSPEC;
1566
1567         /*
1568          *      If the port is specified on the command-line,
1569          *      it over-rides the configuration file.
1570          *
1571          *      FIXME: If argv[0] == "vmpsd", then don't listen on auth/acct!
1572          */
1573         if (mainconfig.port >= 0) auth_port = mainconfig.port;
1574
1575         /*
1576          *      If the IP address was configured on the command-line,
1577          *      use that as the "bind_address"
1578          */
1579         if (mainconfig.myip.af != AF_UNSPEC) {
1580                 memcpy(&server_ipaddr, &mainconfig.myip,
1581                        sizeof(server_ipaddr));
1582                 override = TRUE;
1583                 goto bind_it;
1584         }
1585
1586         /*
1587          *      Else look for bind_address and/or listen sections.
1588          */
1589         server_ipaddr.ipaddr.ip4addr.s_addr = htonl(INADDR_NONE);
1590         rcode = cf_item_parse(config, "bind_address",
1591                               PW_TYPE_IPADDR,
1592                               &server_ipaddr.ipaddr.ip4addr, NULL);
1593         if (rcode < 0) return -1; /* error parsing it */
1594
1595         if (rcode == 0) { /* successfully parsed IPv4 */
1596                 listen_socket_t *sock;
1597                 server_ipaddr.af = AF_INET;
1598
1599                 radlog(L_INFO, "WARNING: The directive 'bind_adress' is deprecated, and will be removed in future versions of FreeRADIUS. Please edit the configuration files to use the directive 'listen'.");
1600
1601         bind_it:
1602 #ifdef WITH_VMPS
1603                 if (strcmp(progname, "vmpsd") == 0) {
1604                         this = listen_alloc(RAD_LISTEN_VQP);
1605                         if (!auth_port) auth_port = 1589;
1606                 } else
1607 #endif
1608                         this = listen_alloc(RAD_LISTEN_AUTH);
1609
1610                 sock = this->data;
1611
1612                 sock->ipaddr = server_ipaddr;
1613                 sock->port = auth_port;
1614
1615                 sock->clients = clients_parse_section(config);
1616                 if (!sock->clients) {
1617                         cf_log_err(cf_sectiontoitem(config),
1618                                    "Failed to find any clients for this listen section");
1619                         listen_free(&this);
1620                         return -1;
1621                 }
1622
1623                 if (listen_bind(this) < 0) {
1624                         listen_free(head);
1625                         radlog(L_ERR, "There appears to be another RADIUS server running on the authentication port %d", sock->port);
1626                         listen_free(&this);
1627                         return -1;
1628                 }
1629                 auth_port = sock->port; /* may have been updated in listen_bind */
1630                 if (override) {
1631                         cs = cf_section_sub_find_name2(config, "server",
1632                                                        mainconfig.name);
1633                         if (cs) this->server = mainconfig.name;
1634                 }
1635
1636                 *last = this;
1637                 last = &(this->next);
1638
1639 #ifdef WITH_VMPS
1640                 /*
1641                  *      No acct for vmpsd
1642                  */
1643                 if (strcmp(progname, "vmpsd") == 0) goto do_proxy;
1644 #endif
1645
1646 #ifdef WITH_ACCOUNTING
1647                 /*
1648                  *      Open Accounting Socket.
1649                  *
1650                  *      If we haven't already gotten acct_port from
1651                  *      /etc/services, then make it auth_port + 1.
1652                  */
1653                 this = listen_alloc(RAD_LISTEN_ACCT);
1654                 sock = this->data;
1655
1656                 /*
1657                  *      Create the accounting socket.
1658                  *
1659                  *      The accounting port is always the
1660                  *      authentication port + 1
1661                  */
1662                 sock->ipaddr = server_ipaddr;
1663                 sock->port = auth_port + 1;
1664
1665                 sock->clients = clients_parse_section(config);
1666                 if (!sock->clients) {
1667                         cf_log_err(cf_sectiontoitem(config),
1668                                    "Failed to find any clients for this listen section");
1669                         return -1;
1670                 }
1671
1672                 if (listen_bind(this) < 0) {
1673                         listen_free(&this);
1674                         listen_free(head);
1675                         radlog(L_ERR, "There appears to be another RADIUS server running on the accounting port %d", sock->port);
1676                         return -1;
1677                 }
1678
1679                 if (override) {
1680                         cs = cf_section_sub_find_name2(config, "server",
1681                                                        mainconfig.name);
1682                         if (cs) this->server = mainconfig.name;
1683                 }
1684
1685                 *last = this;
1686                 last = &(this->next);
1687 #endif
1688         } else if (mainconfig.port > 0) { /* no bind address, but a port */
1689                 radlog(L_ERR, "The command-line says \"-p %d\", but there is no associated IP address to use",
1690                        mainconfig.port);
1691                 return -1;
1692         }
1693
1694         /*
1695          *      They specified an IP on the command-line, ignore
1696          *      all listen sections except the one in '-n'.
1697          */
1698         if (mainconfig.myip.af != AF_UNSPEC) {
1699                 CONF_SECTION *subcs;
1700                 const char *name2 = cf_section_name2(cs);
1701
1702                 cs = cf_section_sub_find_name2(config, "server",
1703                                                mainconfig.name);
1704                 if (!cs) goto do_proxy;
1705
1706                 /*
1707                  *      Should really abstract this code...
1708                  */
1709                 for (subcs = cf_subsection_find_next(cs, NULL, "listen");
1710                      subcs != NULL;
1711                      subcs = cf_subsection_find_next(cs, subcs, "listen")) {
1712                         this = listen_parse(subcs, name2);
1713                         if (!this) {
1714                                 listen_free(head);
1715                                 return -1;
1716                         }
1717
1718 #ifdef WITH_PROXY
1719                         if (this->type == RAD_LISTEN_PROXY) defined_proxy = 1;
1720 #endif
1721
1722                         *last = this;
1723                         last = &(this->next);
1724                 } /* loop over "listen" directives in server <foo> */
1725
1726                 goto do_proxy;
1727         }
1728
1729         /*
1730          *      Walk through the "listen" sections, if they exist.
1731          */
1732         for (cs = cf_subsection_find_next(config, NULL, "listen");
1733              cs != NULL;
1734              cs = cf_subsection_find_next(config, cs, "listen")) {
1735                 this = listen_parse(cs, NULL);
1736                 if (!this) {
1737                         listen_free(head);
1738                         return -1;
1739                 }
1740
1741 #ifdef WITH_PROXY
1742                 if (this->type == RAD_LISTEN_PROXY) defined_proxy = 1;
1743 #endif
1744
1745                 *last = this;
1746                 last = &(this->next);
1747         }
1748
1749         /*
1750          *      Check virtual servers for "listen" sections, too.
1751          *
1752          *      FIXME: Move to virtual server init?
1753          */
1754         for (cs = cf_subsection_find_next(config, NULL, "server");
1755              cs != NULL;
1756              cs = cf_subsection_find_next(config, cs, "server")) {
1757                 CONF_SECTION *subcs;
1758                 const char *name2 = cf_section_name2(cs);
1759
1760                 for (subcs = cf_subsection_find_next(cs, NULL, "listen");
1761                      subcs != NULL;
1762                      subcs = cf_subsection_find_next(cs, subcs, "listen")) {
1763                         this = listen_parse(subcs, name2);
1764                         if (!this) {
1765                                 listen_free(head);
1766                                 return -1;
1767                         }
1768
1769 #ifdef WITH_PROXY
1770                         if (this->type == RAD_LISTEN_PROXY) {
1771                                 radlog(L_ERR, "Error: listen type \"proxy\" Cannot appear in a virtual server section");
1772                                 listen_free(head);
1773                                 return -1;
1774                         }
1775 #endif
1776
1777                         *last = this;
1778                         last = &(this->next);
1779                 } /* loop over "listen" directives in virtual servers */
1780         } /* loop over virtual servers */
1781
1782         /*
1783          *      If we're proxying requests, open the proxy FD.
1784          *      Otherwise, don't do anything.
1785          */
1786  do_proxy:
1787 #ifdef WITH_PROXY
1788         if (mainconfig.proxy_requests == TRUE) {
1789                 int             port = -1;
1790                 listen_socket_t *sock = NULL;
1791
1792                 /*
1793                  *      No sockets to receive packets, therefore
1794                  *      proxying is pointless.
1795                  */
1796                 if (!*head) return -1;
1797
1798                 if (defined_proxy) goto done;
1799
1800                 /*
1801                  *      Find the first authentication port,
1802                  *      and use it
1803                  */
1804                 for (this = *head; this != NULL; this = this->next) {
1805                         if (this->type == RAD_LISTEN_AUTH) {
1806                                 sock = this->data;
1807                                 if (server_ipaddr.af == AF_UNSPEC) {
1808                                         server_ipaddr = sock->ipaddr;
1809                                 }
1810                                 port = sock->port + 2; /* skip acct port */
1811                                 break;
1812                         }
1813                         if (this->type == RAD_LISTEN_VQP) {
1814                                 sock = this->data;
1815                                 if (server_ipaddr.af == AF_UNSPEC) {
1816                                         server_ipaddr = sock->ipaddr;
1817                                 }
1818                                 port = sock->port + 1;
1819                                 break;
1820                         }
1821                 }
1822
1823                 if (port < 0) port = 1024 + (fr_rand() & 0x1ff);
1824
1825                 /*
1826                  *      Address is still unspecified, use IPv4.
1827                  */
1828                 if (server_ipaddr.af == AF_UNSPEC) {
1829                         server_ipaddr.af = AF_INET;
1830                         server_ipaddr.ipaddr.ip4addr.s_addr = htonl(INADDR_ANY);
1831                 }
1832
1833                 this = listen_alloc(RAD_LISTEN_PROXY);
1834                 sock = this->data;
1835
1836                 /*
1837                  *      Create the first proxy socket.
1838                  */
1839                 sock->ipaddr = server_ipaddr;
1840
1841                 /*
1842                  *      Try to find a proxy port (value doesn't matter)
1843                  */
1844                 for (sock->port = port;
1845                      sock->port < 64000;
1846                      sock->port++) {
1847                         if (listen_bind(this) == 0) {
1848                                 *last = this;
1849                                 last = &(this->next); /* just in case */
1850                                 break;
1851                         }
1852                 }
1853
1854                 if (sock->port >= 64000) {
1855                         listen_free(head);
1856                         listen_free(&this);
1857                         radlog(L_ERR, "Failed to open socket for proxying");
1858                         return -1;
1859                 }
1860         }
1861
1862  done:                  /* used only in proxy code. */
1863 #endif
1864
1865         return 0;
1866 }
1867
1868 /*
1869  *      Free a linked list of listeners;
1870  */
1871 void listen_free(rad_listen_t **head)
1872 {
1873         rad_listen_t *this;
1874
1875         if (!head || !*head) return;
1876
1877         this = *head;
1878         while (this) {
1879                 rad_listen_t *next = this->next;
1880
1881                 /*
1882                  *      Other code may have eaten the FD.
1883                  */
1884                 if (this->fd >= 0) close(this->fd);
1885
1886                 if (master_listen[this->type].free) {
1887                         master_listen[this->type].free(this);
1888                 }
1889                 free(this->data);
1890                 free(this);
1891
1892                 this = next;
1893         }
1894
1895         *head = NULL;
1896 }
1897
1898 #ifdef WITH_STATS
1899 RADCLIENT_LIST *listener_find_client_list(const fr_ipaddr_t *ipaddr,
1900                                           int port)
1901 {
1902         rad_listen_t *this;
1903
1904         for (this = mainconfig.listen; this != NULL; this = this->next) {
1905                 listen_socket_t *sock;
1906
1907                 if ((this->type != RAD_LISTEN_AUTH) &&
1908                     (this->type != RAD_LISTEN_ACCT)) continue;
1909
1910                 sock = this->data;
1911
1912                 if ((sock->port == port) &&
1913                     (fr_ipaddr_cmp(ipaddr, &sock->ipaddr) == 0)) {
1914                         return sock->clients;
1915                 }
1916         }
1917
1918         return NULL;
1919 }
1920
1921 rad_listen_t *listener_find_byipaddr(const fr_ipaddr_t *ipaddr, int port)
1922 {
1923         rad_listen_t *this;
1924
1925         for (this = mainconfig.listen; this != NULL; this = this->next) {
1926                 listen_socket_t *sock;
1927
1928                 if ((this->type != RAD_LISTEN_AUTH) &&
1929                     (this->type != RAD_LISTEN_ACCT)) continue;
1930
1931                 sock = this->data;
1932
1933                 if ((sock->port == port) &&
1934                     (fr_ipaddr_cmp(ipaddr, &sock->ipaddr) == 0)) {
1935                         return this;
1936                 }
1937         }
1938
1939         return NULL;
1940 }
1941 #endif