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 WITH_UDPFROMTO
  37 #include <freeradius-devel/udpfromto.h>
  38 #endif
  39
  40 #ifdef HAVE_SYS_RESOURCE_H
  41 #include <sys/resource.h>
  42 #endif
  43
  44 #ifdef HAVE_NET_IF_H
  45 #include <net/if.h>
  46 #endif
  47
  48 #ifdef HAVE_FCNTL_H
  49 #include <fcntl.h>
  50 #endif
  51
  52
  53 /*
  54  *      We'll use this below.
  55  */
  56 typedef int (*rad_listen_parse_t)(CONF_SECTION *, rad_listen_t *);
  57 typedef void (*rad_listen_free_t)(rad_listen_t *);
  58
  59 typedef struct rad_listen_master_t {
  60         rad_listen_parse_t      parse;
  61         rad_listen_free_t       free;
  62         rad_listen_recv_t       recv;
  63         rad_listen_send_t       send;
  64         rad_listen_print_t      print;
  65         rad_listen_encode_t     encode;
  66         rad_listen_decode_t     decode;
  67 } rad_listen_master_t;
  68
  69 typedef struct listen_socket_t {
  70         /*
  71          *      For normal sockets.
  72          */
  73         fr_ipaddr_t     ipaddr;
  74         int             port;
  75
  76 #ifdef SO_BINDTODEVICE
  77         const char              *interface;
  78 #endif
  79
  80 #ifdef WITH_TCP
  81         int             proto;
  82
  83         int             max_connections;
  84         int             num_connections;
  85         struct listen_socket_t *parent;
  86
  87         fr_ipaddr_t     src_ipaddr;
  88         int             src_port;
  89         RADCLIENT       *client; /* for server sockets */
  90
  91         fr_tcp_radius_t *tcp;   /* for RAD_LISTEN_PROXY */
  92         home_server     *home;
  93         RADIUS_PACKET   *packet; /* for reading partial packets */
  94 #endif
  95         RADCLIENT_LIST  *clients;
  96 } listen_socket_t;
  97
  98 static rad_listen_t *listen_alloc(RAD_LISTEN_TYPE type);
  99
 100 /*
 101  *      Find a per-socket client.
 102  */
 103 RADCLIENT *client_listener_find(const rad_listen_t *listener,
 104                                 const fr_ipaddr_t *ipaddr, int src_port)
 105 {
 106 #ifdef WITH_DYNAMIC_CLIENTS
 107         int rcode;
 108         REQUEST *request;
 109         RADCLIENT *created;
 110 #endif
 111         time_t now;
 112         RADCLIENT *client;
 113         RADCLIENT_LIST *clients;
 114
 115         rad_assert(listener != NULL);
 116         rad_assert(ipaddr != NULL);
 117
 118         clients = ((listen_socket_t *)listener->data)->clients;
 119
 120         /*
 121          *      This HAS to have been initialized previously.
 122          */
 123         rad_assert(clients != NULL);
 124
 125         client = client_find(clients, ipaddr
 126 #ifdef WITH_TCP
 127                              , IPPROTO_UDP
 128 #endif
 129                              );
 130         if (!client) {
 131                 static time_t last_printed = 0;
 132                 char name[256], buffer[128];
 133
 134 #ifdef WITH_DYNAMIC_CLIENTS
 135         unknown:                /* used only for dynamic clients */
 136 #endif
 137
 138                 /*
 139                  *      DoS attack quenching, but only in debug mode.
 140                  *      If they're running in debug mode, show them
 141                  *      every packet.
 142                  */
 143                 if (debug_flag == 0) {
 144                         now = time(NULL);
 145                         if (last_printed == now) return NULL;
 146
 147                         last_printed = now;
 148                 }
 149
 150                 listener->print(listener, name, sizeof(name));
 151
 152                 radlog(L_ERR, "Ignoring request to %s from unknown client %s port %d",
 153                        name, inet_ntop(ipaddr->af, &ipaddr->ipaddr,
 154                                        buffer, sizeof(buffer)),
 155                        src_port);
 156                 return NULL;
 157         }
 158
 159 #ifndef WITH_DYNAMIC_CLIENTS
 160         return client;          /* return the found client. */
 161 #else
 162
 163         /*
 164          *      No server defined, and it's not dynamic.  Return it.
 165          */
 166         if (!client->client_server && !client->dynamic) return client;
 167
 168         now = time(NULL);
 169
 170         /*
 171          *      It's a dynamically generated client, check it.
 172          */
 173         if (client->dynamic && (src_port != 0)) {
 174                 /*
 175                  *      Lives forever.  Return it.
 176                  */
 177                 if (client->lifetime == 0) return client;
 178
 179                 /*
 180                  *      Rate-limit the deletion of known clients.
 181                  *      This makes them last a little longer, but
 182                  *      prevents the server from melting down if (say)
 183                  *      10k clients all expire at once.
 184                  */
 185                 if (now == client->last_new_client) return client;
 186
 187                 /*
 188                  *      It's not dead yet.  Return it.
 189                  */
 190                 if ((client->created + client->lifetime) > now) return client;
 191
 192                 /*
 193                  *      This really puts them onto a queue for later
 194                  *      deletion.
 195                  */
 196                 client_delete(clients, client);
 197
 198                 /*
 199                  *      Go find the enclosing network again.
 200                  */
 201                 client = client_find(clients, ipaddr
 202 #ifdef WITH_TCP
 203                                      , IPPROTO_UDP
 204 #endif
 205                                      );
 206
 207                 /*
 208                  *      WTF?
 209                  */
 210                 if (!client) goto unknown;
 211                 if (!client->client_server) goto unknown;
 212
 213                 /*
 214                  *      At this point, 'client' is the enclosing
 215                  *      network that configures where dynamic clients
 216                  *      can be defined.
 217                  */
 218                 rad_assert(client->dynamic == 0);
 219         } else {
 220                 /*
 221                  *      The IP is unknown, so we've found an enclosing
 222                  *      network.  Enable DoS protection.  We only
 223                  *      allow one new client per second.  Known
 224                  *      clients aren't subject to this restriction.
 225                  */
 226                 if (now == client->last_new_client) goto unknown;
 227         }
 228
 229         client->last_new_client = now;
 230
 231         request = request_alloc();
 232         if (!request) goto unknown;
 233
 234         request->listener = listener;
 235         request->client = client;
 236         request->packet = rad_recv(listener->fd, 0x02); /* MSG_PEEK */
 237         if (!request->packet) {                         /* badly formed, etc */
 238                 request_free(&request);
 239                 goto unknown;
 240         }
 241         request->reply = rad_alloc_reply(request->packet);
 242         if (!request->reply) {
 243                 request_free(&request);
 244                 goto unknown;
 245         }
 246         request->packet->timestamp = request->timestamp;
 247         request->number = 0;
 248         request->priority = listener->type;
 249         request->server = client->client_server;
 250         request->root = &mainconfig;
 251
 252         /*
 253          *      Run a fake request through the given virtual server.
 254          *      Look for FreeRADIUS-Client-IP-Address
 255          *               FreeRADIUS-Client-Secret
 256          *              ...
 257          *
 258          *      and create the RADCLIENT structure from that.
 259          */
 260         DEBUG("server %s {", request->server);
 261
 262         rcode = module_authorize(0, request);
 263
 264         DEBUG("} # server %s", request->server);
 265
 266         if (rcode != RLM_MODULE_OK) {
 267                 request_free(&request);
 268                 goto unknown;
 269         }
 270
 271         /*
 272          *      If the client was updated by rlm_dynamic_clients,
 273          *      don't create the client from attribute-value pairs.
 274          */
 275         if (request->client == client) {
 276                 created = client_create(clients, request);
 277         } else {
 278                 created = request->client;
 279
 280                 /*
 281                  *      This frees the client if it isn't valid.
 282                  */
 283                 if (!client_validate(clients, client, created)) goto unknown;
 284         }
 285         request_free(&request);
 286
 287         if (!created) goto unknown;
 288
 289         return created;
 290 #endif
 291 }
 292
 293 static int listen_bind(rad_listen_t *this);
 294
 295
 296 /*
 297  *      Process and reply to a server-status request.
 298  *      Like rad_authenticate and rad_accounting this should
 299  *      live in it's own file but it's so small we don't bother.
 300  */
 301 static int rad_status_server(REQUEST *request)
 302 {
 303         int rcode = RLM_MODULE_OK;
 304         DICT_VALUE *dval;
 305
 306         switch (request->listener->type) {
 307 #ifdef WITH_STATS
 308         case RAD_LISTEN_NONE:
 309 #endif
 310         case RAD_LISTEN_AUTH:
 311                 dval = dict_valbyname(PW_AUTZ_TYPE, "Status-Server");
 312                 if (dval) {
 313                         rcode = module_authorize(dval->value, request);
 314                 } else {
 315                         rcode = RLM_MODULE_OK;
 316                 }
 317
 318                 switch (rcode) {
 319                 case RLM_MODULE_OK:
 320                 case RLM_MODULE_UPDATED:
 321                         request->reply->code = PW_AUTHENTICATION_ACK;
 322                         break;
 323
 324                 case RLM_MODULE_FAIL:
 325                 case RLM_MODULE_HANDLED:
 326                         request->reply->code = 0; /* don't reply */
 327                         break;
 328
 329                 default:
 330                 case RLM_MODULE_REJECT:
 331                         request->reply->code = PW_AUTHENTICATION_REJECT;
 332                         break;
 333                 }
 334                 break;
 335
 336 #ifdef WITH_ACCOUNTING
 337         case RAD_LISTEN_ACCT:
 338                 dval = dict_valbyname(PW_ACCT_TYPE, "Status-Server");
 339                 if (dval) {
 340                         rcode = module_accounting(dval->value, request);
 341                 } else {
 342                         rcode = RLM_MODULE_OK;
 343                 }
 344
 345                 switch (rcode) {
 346                 case RLM_MODULE_OK:
 347                 case RLM_MODULE_UPDATED:
 348                         request->reply->code = PW_ACCOUNTING_RESPONSE;
 349                         break;
 350
 351                 default:
 352                         request->reply->code = 0; /* don't reply */
 353                         break;
 354                 }
 355                 break;
 356 #endif
 357
 358 #ifdef WITH_COA
 359                 /*
 360                  *      This is a vendor extension.  Suggested by Glen
 361                  *      Zorn in IETF 72, and rejected by the rest of
 362                  *      the WG.  We like it, so it goes in here.
 363                  */
 364         case RAD_LISTEN_COA:
 365                 dval = dict_valbyname(PW_RECV_COA_TYPE, "Status-Server");
 366                 if (dval) {
 367                         rcode = module_recv_coa(dval->value, request);
 368                 } else {
 369                         rcode = RLM_MODULE_OK;
 370                 }
 371
 372                 switch (rcode) {
 373                 case RLM_MODULE_OK:
 374                 case RLM_MODULE_UPDATED:
 375                         request->reply->code = PW_COA_ACK;
 376                         break;
 377
 378                 default:
 379                         request->reply->code = 0; /* don't reply */
 380                         break;
 381                 }
 382                 break;
 383 #endif
 384
 385         default:
 386                 return 0;
 387         }
 388
 389 #ifdef WITH_STATS
 390         /*
 391          *      Full statistics are available only on a statistics
 392          *      socket.
 393          */
 394         if (request->listener->type == RAD_LISTEN_NONE) {
 395                 request_stats_reply(request);
 396         }
 397 #endif
 398
 399         return 0;
 400 }
 401
 402
 403 static int socket_print(rad_listen_t *this, char *buffer, size_t bufsize)
 404 {
 405         size_t len;
 406         listen_socket_t *sock = this->data;
 407         const char *name;
 408
 409         switch (this->type) {
 410 #ifdef WITH_STATS
 411         case RAD_LISTEN_NONE:   /* what a hack... */
 412                 name = "status";
 413                 break;
 414 #endif
 415
 416         case RAD_LISTEN_AUTH:
 417                 name = "authentication";
 418                 break;
 419
 420 #ifdef WITH_ACCOUNTING
 421         case RAD_LISTEN_ACCT:
 422                 name = "accounting";
 423                 break;
 424 #endif
 425
 426 #ifdef WITH_PROXY
 427         case RAD_LISTEN_PROXY:
 428                 name = "proxy";
 429                 break;
 430 #endif
 431
 432 #ifdef WITH_VMPS
 433         case RAD_LISTEN_VQP:
 434                 name = "vmps";
 435                 break;
 436 #endif
 437
 438 #ifdef WITH_DHCP
 439         case RAD_LISTEN_DHCP:
 440                 name = "dhcp";
 441                 break;
 442 #endif
 443
 444 #ifdef WITH_COA
 445         case RAD_LISTEN_COA:
 446                 name = "coa";
 447                 break;
 448 #endif
 449
 450         default:
 451                 name = "??";
 452                 break;
 453         }
 454
 455 #define FORWARD len = strlen(buffer); if (len >= (bufsize + 1)) return 0;buffer += len;bufsize -= len
 456 #define ADDSTRING(_x) strlcpy(buffer, _x, bufsize);FORWARD
 457
 458         ADDSTRING(name);
 459
 460 #ifdef SO_BINDTODEVICE
 461         if (sock->interface) {
 462                 ADDSTRING(" interface ");
 463                 ADDSTRING(sock->interface);
 464         }
 465 #endif
 466
 467         ADDSTRING(" address ");
 468
 469         if ((sock->ipaddr.af == AF_INET) &&
 470             (sock->ipaddr.ipaddr.ip4addr.s_addr == htonl(INADDR_ANY))) {
 471                 strlcpy(buffer, "*", bufsize);
 472         } else {
 473                 ip_ntoh(&sock->ipaddr, buffer, bufsize);
 474         }
 475         FORWARD;
 476
 477         ADDSTRING(" port ");
 478         snprintf(buffer, bufsize, "%d", sock->port);
 479         FORWARD;
 480
 481         if (this->server) {
 482                 ADDSTRING(" as server ");
 483                 ADDSTRING(this->server);
 484         }
 485
 486 #undef ADDSTRING
 487 #undef FORWARD
 488
 489         return 1;
 490 }
 491
 492
 493 /*
 494  *      Parse an authentication or accounting socket.
 495  */
 496 static int common_socket_parse(CONF_SECTION *cs, rad_listen_t *this)
 497 {
 498         int             rcode;
 499         int             listen_port;
 500         fr_ipaddr_t     ipaddr;
 501         listen_socket_t *sock = this->data;
 502         char            *section_name = NULL;
 503         CONF_SECTION    *client_cs, *parentcs;
 504
 505         /*
 506          *      Try IPv4 first
 507          */
 508         ipaddr.ipaddr.ip4addr.s_addr = htonl(INADDR_NONE);
 509         rcode = cf_item_parse(cs, "ipaddr", PW_TYPE_IPADDR,
 510                               &ipaddr.ipaddr.ip4addr, NULL);
 511         if (rcode < 0) return -1;
 512
 513         if (rcode == 0) { /* successfully parsed IPv4 */
 514                 ipaddr.af = AF_INET;
 515
 516         } else {        /* maybe IPv6? */
 517                 rcode = cf_item_parse(cs, "ipv6addr", PW_TYPE_IPV6ADDR,
 518                                       &ipaddr.ipaddr.ip6addr, NULL);
 519                 if (rcode < 0) return -1;
 520
 521                 if (rcode == 1) {
 522                         cf_log_err(cf_sectiontoitem(cs),
 523                                    "No address specified in listen section");
 524                         return -1;
 525                 }
 526                 ipaddr.af = AF_INET6;
 527         }
 528
 529         rcode = cf_item_parse(cs, "port", PW_TYPE_INTEGER,
 530                               &listen_port, "0");
 531         if (rcode < 0) return -1;
 532
 533         if ((listen_port < 0) || (listen_port > 65535)) {
 534                         cf_log_err(cf_sectiontoitem(cs),
 535                                    "Invalid value for \"port\"");
 536                         return -1;
 537         }
 538
 539         sock->ipaddr = ipaddr;
 540         sock->port = listen_port;
 541
 542         /*
 543          *      If we can bind to interfaces, do so,
 544          *      else don't.
 545          */
 546         if (cf_pair_find(cs, "interface")) {
 547 #ifndef SO_BINDTODEVICE
 548                 cf_log_err(cf_sectiontoitem(cs),
 549                            "System does not support binding to interfaces.  Delete this line from the configuration file.");
 550                 return -1;
 551 #else
 552                 const char *value;
 553                 CONF_PAIR *cp = cf_pair_find(cs, "interface");
 554
 555                 rad_assert(cp != NULL);
 556                 value = cf_pair_value(cp);
 557                 if (!value) {
 558                         cf_log_err(cf_sectiontoitem(cs),
 559                                    "No interface name given");
 560                         return -1;
 561                 }
 562                 sock->interface = value;
 563 #endif
 564         }
 565
 566         /*
 567          *      And bind it to the port.
 568          */
 569         if (listen_bind(this) < 0) {
 570                 char buffer[128];
 571                 cf_log_err(cf_sectiontoitem(cs),
 572                            "Error binding to port for %s port %d",
 573                            ip_ntoh(&sock->ipaddr, buffer, sizeof(buffer)),
 574                            sock->port);
 575                 return -1;
 576         }
 577
 578 #ifdef WITH_PROXY
 579         /*
 580          *      Proxy sockets don't have clients.
 581          */
 582         if (this->type == RAD_LISTEN_PROXY) return 0;
 583 #endif
 584
 585         /*
 586          *      The more specific configurations are preferred to more
 587          *      generic ones.
 588          */
 589         client_cs = NULL;
 590         parentcs = cf_top_section(cs);
 591         rcode = cf_item_parse(cs, "clients", PW_TYPE_STRING_PTR,
 592                               &section_name, NULL);
 593         if (rcode < 0) return -1; /* bad string */
 594         if (rcode == 0) {
 595                 /*
 596                  *      Explicit list given: use it.
 597                  */
 598                 client_cs = cf_section_sub_find_name2(parentcs,
 599                                                       "clients",
 600                                                       section_name);
 601                 if (!client_cs) {
 602                         client_cs = cf_section_find(section_name);
 603                 }
 604                 if (!client_cs) {
 605                         cf_log_err(cf_sectiontoitem(cs),
 606                                    "Failed to find clients %s {...}",
 607                                    section_name);
 608                         free(section_name);
 609                         return -1;
 610                 }
 611                 free(section_name);
 612         } /* else there was no "clients = " entry. */
 613
 614         if (!client_cs) {
 615                 CONF_SECTION *server_cs;
 616
 617                 server_cs = cf_section_sub_find_name2(parentcs,
 618                                                       "server",
 619                                                       this->server);
 620                 /*
 621                  *      Found a "server foo" section.  If there are clients
 622                  *      in it, use them.
 623                  */
 624                 if (server_cs &&
 625                     (cf_section_sub_find(server_cs, "client") != NULL)) {
 626                         client_cs = server_cs;
 627                 }
 628         }
 629
 630         /*
 631          *      Still nothing.  Look for global clients.
 632          */
 633         if (!client_cs) client_cs = parentcs;
 634
 635         sock->clients = clients_parse_section(client_cs);
 636         if (!sock->clients) {
 637                 cf_log_err(cf_sectiontoitem(cs),
 638                            "Failed to load clients for this listen section");
 639                 return -1;
 640         }
 641
 642         return 0;
 643 }
 644
 645 /*
 646  *      Send an authentication response packet
 647  */
 648 static int auth_socket_send(rad_listen_t *listener, REQUEST *request)
 649 {
 650         rad_assert(request->listener == listener);
 651         rad_assert(listener->send == auth_socket_send);
 652
 653         return rad_send(request->reply, request->packet,
 654                         request->client->secret);
 655 }
 656
 657
 658 #ifdef WITH_ACCOUNTING
 659 /*
 660  *      Send an accounting response packet (or not)
 661  */
 662 static int acct_socket_send(rad_listen_t *listener, REQUEST *request)
 663 {
 664         rad_assert(request->listener == listener);
 665         rad_assert(listener->send == acct_socket_send);
 666
 667         /*
 668          *      Accounting reject's are silently dropped.
 669          *
 670          *      We do it here to avoid polluting the rest of the
 671          *      code with this knowledge
 672          */
 673         if (request->reply->code == 0) return 0;
 674
 675         return rad_send(request->reply, request->packet,
 676                         request->client->secret);
 677 }
 678 #endif
 679
 680 #ifdef WITH_PROXY
 681 /*
 682  *      Send a packet to a home server.
 683  *
 684  *      FIXME: have different code for proxy auth & acct!
 685  */
 686 static int proxy_socket_send(rad_listen_t *listener, REQUEST *request)
 687 {
 688         listen_socket_t *sock = listener->data;
 689
 690         rad_assert(request->proxy_listener == listener);
 691         rad_assert(listener->send == proxy_socket_send);
 692
 693         request->proxy->src_ipaddr = sock->ipaddr;
 694         request->proxy->src_port = sock->port;
 695
 696         return rad_send(request->proxy, request->packet,
 697                         request->home_server->secret);
 698 }
 699 #endif
 700
 701 #ifdef WITH_STATS
 702 /*
 703  *      Check if an incoming request is "ok"
 704  *
 705  *      It takes packets, not requests.  It sees if the packet looks
 706  *      OK.  If so, it does a number of sanity checks on it.
 707   */
 708 static int stats_socket_recv(rad_listen_t *listener,
 709                             RAD_REQUEST_FUNP *pfun, REQUEST **prequest)
 710 {
 711         ssize_t         rcode;
 712         int             code, src_port;
 713         RADIUS_PACKET   *packet;
 714         RADCLIENT       *client;
 715         fr_ipaddr_t     src_ipaddr;
 716
 717         rcode = rad_recv_header(listener->fd, &src_ipaddr, &src_port, &code);
 718         if (rcode < 0) return 0;
 719
 720         RAD_STATS_TYPE_INC(listener, total_requests);
 721
 722         if (rcode < 20) {       /* AUTH_HDR_LEN */
 723                 RAD_STATS_TYPE_INC(listener, total_malformed_requests);
 724                 return 0;
 725         }
 726
 727         if ((client = client_listener_find(listener,
 728                                            &src_ipaddr, src_port)) == NULL) {
 729                 rad_recv_discard(listener->fd);
 730                 RAD_STATS_TYPE_INC(listener, total_invalid_requests);
 731                 return 0;
 732         }
 733
 734         /*
 735          *      We only understand Status-Server on this socket.
 736          */
 737         if (code != PW_STATUS_SERVER) {
 738                 DEBUG("Ignoring packet code %d sent to Status-Server port",
 739                       code);
 740                 rad_recv_discard(listener->fd);
 741                 RAD_STATS_TYPE_INC(listener, total_unknown_types);
 742                 RAD_STATS_CLIENT_INC(listener, client, total_unknown_types);
 743                 return 0;
 744         }
 745
 746         /*
 747          *      Now that we've sanity checked everything, receive the
 748          *      packet.
 749          */
 750         packet = rad_recv(listener->fd, 1); /* require message authenticator */
 751         if (!packet) {
 752                 RAD_STATS_TYPE_INC(listener, total_malformed_requests);
 753                 DEBUG("%s", fr_strerror());
 754                 return 0;
 755         }
 756
 757         if (!received_request(listener, packet, prequest, client)) {
 758                 RAD_STATS_TYPE_INC(listener, total_packets_dropped);
 759                 RAD_STATS_CLIENT_INC(listener, client, total_packets_dropped);
 760                 rad_free(&packet);
 761                 return 0;
 762         }
 763
 764         *pfun = rad_status_server;
 765         return 1;
 766 }
 767 #endif
 768
 769
 770 /*
 771  *      Check if an incoming request is "ok"
 772  *
 773  *      It takes packets, not requests.  It sees if the packet looks
 774  *      OK.  If so, it does a number of sanity checks on it.
 775   */
 776 static int auth_socket_recv(rad_listen_t *listener,
 777                             RAD_REQUEST_FUNP *pfun, REQUEST **prequest)
 778 {
 779         ssize_t         rcode;
 780         int             code, src_port;
 781         RADIUS_PACKET   *packet;
 782         RAD_REQUEST_FUNP fun = NULL;
 783         RADCLIENT       *client;
 784         fr_ipaddr_t     src_ipaddr;
 785
 786         rcode = rad_recv_header(listener->fd, &src_ipaddr, &src_port, &code);
 787         if (rcode < 0) return 0;
 788
 789         RAD_STATS_TYPE_INC(listener, total_requests);
 790
 791         if (rcode < 20) {       /* AUTH_HDR_LEN */
 792                 RAD_STATS_TYPE_INC(listener, total_malformed_requests);
 793                 return 0;
 794         }
 795
 796         if ((client = client_listener_find(listener,
 797                                            &src_ipaddr, src_port)) == NULL) {
 798                 rad_recv_discard(listener->fd);
 799                 RAD_STATS_TYPE_INC(listener, total_invalid_requests);
 800                 return 0;
 801         }
 802
 803         /*
 804          *      Some sanity checks, based on the packet code.
 805          */
 806         switch(code) {
 807         case PW_AUTHENTICATION_REQUEST:
 808                 RAD_STATS_CLIENT_INC(listener, client, total_requests);
 809                 fun = rad_authenticate;
 810                 break;
 811
 812         case PW_STATUS_SERVER:
 813                 if (!mainconfig.status_server) {
 814                         rad_recv_discard(listener->fd);
 815                         RAD_STATS_TYPE_INC(listener, total_packets_dropped);
 816                         RAD_STATS_CLIENT_INC(listener, client, total_packets_dropped);
 817                         DEBUG("WARNING: Ignoring Status-Server request due to security configuration");
 818                         return 0;
 819                 }
 820                 fun = rad_status_server;
 821                 break;
 822
 823         default:
 824                 rad_recv_discard(listener->fd);
 825                 RAD_STATS_INC(radius_auth_stats.total_unknown_types);
 826                 RAD_STATS_CLIENT_INC(listener, client, total_unknown_types);
 827
 828                 DEBUG("Invalid packet code %d sent to authentication port from client %s port %d : IGNORED",
 829                       code, client->shortname, src_port);
 830                 return 0;
 831                 break;
 832         } /* switch over packet types */
 833
 834         /*
 835          *      Now that we've sanity checked everything, receive the
 836          *      packet.
 837          */
 838         packet = rad_recv(listener->fd, client->message_authenticator);
 839         if (!packet) {
 840                 RAD_STATS_TYPE_INC(listener, total_malformed_requests);
 841                 DEBUG("%s", fr_strerror());
 842                 return 0;
 843         }
 844
 845         if (!received_request(listener, packet, prequest, client)) {
 846                 RAD_STATS_TYPE_INC(listener, total_packets_dropped);
 847                 RAD_STATS_CLIENT_INC(listener, client, total_packets_dropped);
 848                 rad_free(&packet);
 849                 return 0;
 850         }
 851
 852         *pfun = fun;
 853         return 1;
 854 }
 855
 856
 857 #ifdef WITH_ACCOUNTING
 858 /*
 859  *      Receive packets from an accounting socket
 860  */
 861 static int acct_socket_recv(rad_listen_t *listener,
 862                             RAD_REQUEST_FUNP *pfun, REQUEST **prequest)
 863 {
 864         ssize_t         rcode;
 865         int             code, src_port;
 866         RADIUS_PACKET   *packet;
 867         RAD_REQUEST_FUNP fun = NULL;
 868         RADCLIENT       *client;
 869         fr_ipaddr_t     src_ipaddr;
 870
 871         rcode = rad_recv_header(listener->fd, &src_ipaddr, &src_port, &code);
 872         if (rcode < 0) return 0;
 873
 874         RAD_STATS_TYPE_INC(listener, total_requests);
 875
 876         if (rcode < 20) {       /* AUTH_HDR_LEN */
 877                 RAD_STATS_TYPE_INC(listener, total_malformed_requests);
 878                 return 0;
 879         }
 880
 881         if ((client = client_listener_find(listener,
 882                                            &src_ipaddr, src_port)) == NULL) {
 883                 rad_recv_discard(listener->fd);
 884                 RAD_STATS_TYPE_INC(listener, total_invalid_requests);
 885                 return 0;
 886         }
 887
 888         /*
 889          *      Some sanity checks, based on the packet code.
 890          */
 891         switch(code) {
 892         case PW_ACCOUNTING_REQUEST:
 893                 RAD_STATS_CLIENT_INC(listener, client, total_requests);
 894                 fun = rad_accounting;
 895                 break;
 896
 897         case PW_STATUS_SERVER:
 898                 if (!mainconfig.status_server) {
 899                         rad_recv_discard(listener->fd);
 900                         RAD_STATS_TYPE_INC(listener, total_packets_dropped);
 901                         RAD_STATS_CLIENT_INC(listener, client, total_unknown_types);
 902
 903                         DEBUG("WARNING: Ignoring Status-Server request due to security configuration");
 904                         return 0;
 905                 }
 906                 fun = rad_status_server;
 907                 break;
 908
 909         default:
 910                 rad_recv_discard(listener->fd);
 911                 RAD_STATS_TYPE_INC(listener, total_unknown_types);
 912                 RAD_STATS_CLIENT_INC(listener, client, total_unknown_types);
 913
 914                 DEBUG("Invalid packet code %d sent to a accounting port from client %s port %d : IGNORED",
 915                       code, client->shortname, src_port);
 916                 return 0;
 917         } /* switch over packet types */
 918
 919         /*
 920          *      Now that we've sanity checked everything, receive the
 921          *      packet.
 922          */
 923         packet = rad_recv(listener->fd, 0);
 924         if (!packet) {
 925                 RAD_STATS_TYPE_INC(listener, total_malformed_requests);
 926                 radlog(L_ERR, "%s", fr_strerror());
 927                 return 0;
 928         }
 929
 930         /*
 931          *      There can be no duplicate accounting packets.
 932          */
 933         if (!received_request(listener, packet, prequest, client)) {
 934                 RAD_STATS_TYPE_INC(listener, total_packets_dropped);
 935                 RAD_STATS_CLIENT_INC(listener, client, total_packets_dropped);
 936                 rad_free(&packet);
 937                 return 0;
 938         }
 939
 940         *pfun = fun;
 941         return 1;
 942 }
 943 #endif
 944
 945
 946 #ifdef WITH_COA
 947 /*
 948  *      For now, all CoA requests are *only* originated, and not
 949  *      proxied.  So all of the necessary work is done in the
 950  *      post-proxy section, which is automatically handled by event.c.
 951  *      As a result, we don't have to do anything here.
 952  */
 953 static int rad_coa_reply(REQUEST *request)
 954 {
 955         VALUE_PAIR *s1, *s2;
 956
 957         /*
 958          *      Inform the user about RFC requirements.
 959          */
 960         s1 = pairfind(request->proxy->vps, PW_STATE);
 961         if (s1) {
 962                 s2 = pairfind(request->proxy_reply->vps, PW_STATE);
 963
 964                 if (!s2) {
 965                         DEBUG("WARNING: Client was sent State in CoA, and did not respond with State.");
 966
 967                 } else if ((s1->length != s2->length) ||
 968                            (memcmp(s1->vp_octets, s2->vp_octets,
 969                                    s1->length) != 0)) {
 970                         DEBUG("WARNING: Client was sent State in CoA, and did not respond with the same State.");
 971                 }
 972         }
 973
 974         return RLM_MODULE_OK;
 975 }
 976
 977 /*
 978  *      Receive a CoA packet.
 979  */
 980 static int rad_coa_recv(REQUEST *request)
 981 {
 982         int rcode = RLM_MODULE_OK;
 983         int ack, nak;
 984         VALUE_PAIR *vp;
 985
 986         /*
 987          *      Get the correct response
 988          */
 989         switch (request->packet->code) {
 990         case PW_COA_REQUEST:
 991                 ack = PW_COA_ACK;
 992                 nak = PW_COA_NAK;
 993                 break;
 994
 995         case PW_DISCONNECT_REQUEST:
 996                 ack = PW_DISCONNECT_ACK;
 997                 nak = PW_DISCONNECT_NAK;
 998                 break;
 999
1000         default:                /* shouldn't happen */
1001                 return RLM_MODULE_FAIL;
1002         }
1003
1004 #ifdef WITH_PROXY
1005 #define WAS_PROXIED (request->proxy)
1006 #else
1007 #define WAS_PROXIED (0)
1008 #endif
1009
1010         if (!WAS_PROXIED) {
1011                 /*
1012                  *      RFC 5176 Section 3.3.  If we have a CoA-Request
1013                  *      with Service-Type = Authorize-Only, it MUST
1014                  *      have a State attribute in it.
1015                  */
1016                 vp = pairfind(request->packet->vps, PW_SERVICE_TYPE);
1017                 if (request->packet->code == PW_COA_REQUEST) {
1018                         if (vp && (vp->vp_integer == 17)) {
1019                                 vp = pairfind(request->packet->vps, PW_STATE);
1020                                 if (!vp || (vp->length == 0)) {
1021                                         RDEBUG("ERROR: CoA-Request with Service-Type = Authorize-Only MUST contain a State attribute");
1022                                         request->reply->code = PW_COA_NAK;
1023                                         return RLM_MODULE_FAIL;
1024                                 }
1025                         }
1026                 } else if (vp) {
1027                         /*
1028                          *      RFC 5176, Section 3.2.
1029                          */
1030                         RDEBUG("ERROR: Disconnect-Request MUST NOT contain a Service-Type attribute");
1031                         request->reply->code = PW_DISCONNECT_NAK;
1032                         return RLM_MODULE_FAIL;
1033                 }
1034
1035                 rcode = module_recv_coa(0, request);
1036                 switch (rcode) {
1037                 case RLM_MODULE_FAIL:
1038                 case RLM_MODULE_INVALID:
1039                 case RLM_MODULE_REJECT:
1040                 case RLM_MODULE_USERLOCK:
1041                 default:
1042                         request->reply->code = nak;
1043                         break;
1044
1045                 case RLM_MODULE_HANDLED:
1046                         return rcode;
1047
1048                 case RLM_MODULE_NOOP:
1049                 case RLM_MODULE_NOTFOUND:
1050                 case RLM_MODULE_OK:
1051                 case RLM_MODULE_UPDATED:
1052                         request->reply->code = ack;
1053                         break;
1054                 }
1055         } else {
1056                 /*
1057                  *      Start the reply code with the proxy reply
1058                  *      code.
1059                  */
1060                 request->reply->code = request->proxy_reply->code;
1061         }
1062
1063         /*
1064          *      Copy State from the request to the reply.
1065          *      See RFC 5176 Section 3.3.
1066          */
1067         vp = paircopy2(request->packet->vps, PW_STATE);
1068         if (vp) pairadd(&request->reply->vps, vp);
1069
1070         /*
1071          *      We may want to over-ride the reply.
1072          */
1073         rcode = module_send_coa(0, request);
1074         switch (rcode) {
1075                 /*
1076                  *      We need to send CoA-NAK back if Service-Type
1077                  *      is Authorize-Only.  Rely on the user's policy
1078                  *      to do that.  We're not a real NAS, so this
1079                  *      restriction doesn't (ahem) apply to us.
1080                  */
1081                 case RLM_MODULE_FAIL:
1082                 case RLM_MODULE_INVALID:
1083                 case RLM_MODULE_REJECT:
1084                 case RLM_MODULE_USERLOCK:
1085                 default:
1086                         /*
1087                          *      Over-ride an ACK with a NAK
1088                          */
1089                         request->reply->code = nak;
1090                         break;
1091
1092                 case RLM_MODULE_HANDLED:
1093                         return rcode;
1094
1095                 case RLM_MODULE_NOOP:
1096                 case RLM_MODULE_NOTFOUND:
1097                 case RLM_MODULE_OK:
1098                 case RLM_MODULE_UPDATED:
1099                         /*
1100                          *      Do NOT over-ride a previously set value.
1101                          *      Otherwise an "ok" here will re-write a
1102                          *      NAK to an ACK.
1103                          */
1104                         if (request->reply->code == 0) {
1105                                 request->reply->code = ack;
1106                         }
1107                         break;
1108
1109         }
1110
1111         return RLM_MODULE_OK;
1112 }
1113
1114
1115 /*
1116  *      Check if an incoming request is "ok"
1117  *
1118  *      It takes packets, not requests.  It sees if the packet looks
1119  *      OK.  If so, it does a number of sanity checks on it.
1120   */
1121 static int coa_socket_recv(rad_listen_t *listener,
1122                             RAD_REQUEST_FUNP *pfun, REQUEST **prequest)
1123 {
1124         ssize_t         rcode;
1125         int             code, src_port;
1126         RADIUS_PACKET   *packet;
1127         RAD_REQUEST_FUNP fun = NULL;
1128         char            buffer[128];
1129         RADCLIENT       *client;
1130         fr_ipaddr_t     src_ipaddr;
1131
1132         rcode = rad_recv_header(listener->fd, &src_ipaddr, &src_port, &code);
1133         if (rcode < 0) return 0;
1134
1135         RAD_STATS_TYPE_INC(listener, total_requests);
1136
1137         if (rcode < 20) {       /* AUTH_HDR_LEN */
1138                 RAD_STATS_TYPE_INC(listener, total_malformed_requests);
1139                 return 0;
1140         }
1141
1142         if ((client = client_listener_find(listener,
1143                                            &src_ipaddr, src_port)) == NULL) {
1144                 rad_recv_discard(listener->fd);
1145                 RAD_STATS_TYPE_INC(listener, total_invalid_requests);
1146
1147                 if (debug_flag > 0) {
1148                         char name[1024];
1149
1150                         listener->print(listener, name, sizeof(name));
1151
1152                         /*
1153                          *      This is debugging rather than logging, so that
1154                          *      DoS attacks don't affect us.
1155                          */
1156                         DEBUG("Ignoring request to %s from unknown client %s port %d",
1157                               name,
1158                               inet_ntop(src_ipaddr.af, &src_ipaddr.ipaddr,
1159                                         buffer, sizeof(buffer)), src_port);
1160                 }
1161
1162                 return 0;
1163         }
1164
1165         /*
1166          *      Some sanity checks, based on the packet code.
1167          */
1168         switch(code) {
1169         case PW_COA_REQUEST:
1170         case PW_DISCONNECT_REQUEST:
1171                 fun = rad_coa_recv;
1172                 break;
1173
1174         default:
1175                 rad_recv_discard(listener->fd);
1176                 DEBUG("Invalid packet code %d sent to coa port from client %s port %d : IGNORED",
1177                       code, client->shortname, src_port);
1178                 return 0;
1179                 break;
1180         } /* switch over packet types */
1181
1182         /*
1183          *      Now that we've sanity checked everything, receive the
1184          *      packet.
1185          */
1186         packet = rad_recv(listener->fd, client->message_authenticator);
1187         if (!packet) {
1188                 RAD_STATS_TYPE_INC(listener, total_malformed_requests);
1189                 DEBUG("%s", fr_strerror());
1190                 return 0;
1191         }
1192
1193         if (!received_request(listener, packet, prequest, client)) {
1194                 rad_free(&packet);
1195                 return 0;
1196         }
1197
1198         *pfun = fun;
1199         return 1;
1200 }
1201 #endif
1202
1203 #ifdef WITH_PROXY
1204 /*
1205  *      Recieve packets from a proxy socket.
1206  */
1207 static int proxy_socket_recv(rad_listen_t *listener,
1208                               RAD_REQUEST_FUNP *pfun, REQUEST **prequest)
1209 {
1210         REQUEST         *request;
1211         RADIUS_PACKET   *packet;
1212         RAD_REQUEST_FUNP fun = NULL;
1213         char            buffer[128];
1214
1215         packet = rad_recv(listener->fd, 0);
1216         if (!packet) {
1217                 radlog(L_ERR, "%s", fr_strerror());
1218                 return 0;
1219         }
1220
1221         /*
1222          *      FIXME: Client MIB updates?
1223          */
1224         switch(packet->code) {
1225         case PW_AUTHENTICATION_ACK:
1226         case PW_ACCESS_CHALLENGE:
1227         case PW_AUTHENTICATION_REJECT:
1228                 fun = rad_authenticate;
1229                 break;
1230
1231 #ifdef WITH_ACCOUNTING
1232         case PW_ACCOUNTING_RESPONSE:
1233                 fun = rad_accounting;
1234                 break;
1235 #endif
1236
1237 #ifdef WITH_COA
1238         case PW_DISCONNECT_ACK:
1239         case PW_DISCONNECT_NAK:
1240         case PW_COA_ACK:
1241         case PW_COA_NAK:
1242                 fun = rad_coa_reply;
1243                 break;
1244 #endif
1245
1246         default:
1247                 /*
1248                  *      FIXME: Update MIB for packet types?
1249                  */
1250                 radlog(L_ERR, "Invalid packet code %d sent to a proxy port "
1251                        "from home server %s port %d - ID %d : IGNORED",
1252                        packet->code,
1253                        ip_ntoh(&packet->src_ipaddr, buffer, sizeof(buffer)),
1254                        packet->src_port, packet->id);
1255                 rad_free(&packet);
1256                 return 0;
1257         }
1258
1259         request = received_proxy_response(packet);
1260         if (!request) {
1261                 rad_free(&packet);
1262                 return 0;
1263         }
1264
1265 #ifdef WITH_COA
1266         /*
1267          *      Distinguish proxied CoA requests from ones we
1268          *      originate.
1269          */
1270         if ((fun == rad_coa_reply) &&
1271             (request->packet->code == request->proxy->code)) {
1272                 fun = rad_coa_recv;
1273         }
1274 #endif
1275
1276         rad_assert(fun != NULL);
1277         *pfun = fun;
1278         *prequest = request;
1279
1280         return 1;
1281 }
1282
1283 #ifdef WITH_TCP
1284 /*
1285  *      Recieve packets from a proxy socket.
1286  */
1287 static int proxy_socket_tcp_recv(rad_listen_t *listener,
1288                                  RAD_REQUEST_FUNP *pfun, REQUEST **prequest)
1289 {
1290         REQUEST         *request;
1291         RADIUS_PACKET   *packet;
1292         RAD_REQUEST_FUNP fun = NULL;
1293         char            buffer[128];
1294
1295         packet = fr_tcp_recv(listener->fd, 0);
1296         if (!packet) {
1297                 proxy_close_tcp_listener(listener);
1298                 return 0;
1299         }
1300
1301         /*
1302          *      FIXME: Client MIB updates?
1303          */
1304         switch(packet->code) {
1305         case PW_AUTHENTICATION_ACK:
1306         case PW_ACCESS_CHALLENGE:
1307         case PW_AUTHENTICATION_REJECT:
1308                 fun = rad_authenticate;
1309                 break;
1310
1311 #ifdef WITH_ACCOUNTING
1312         case PW_ACCOUNTING_RESPONSE:
1313                 fun = rad_accounting;
1314                 break;
1315 #endif
1316
1317         default:
1318                 /*
1319                  *      FIXME: Update MIB for packet types?
1320                  */
1321                 radlog(L_ERR, "Invalid packet code %d sent to a proxy port "
1322                        "from home server %s port %d - ID %d : IGNORED",
1323                        packet->code,
1324                        ip_ntoh(&packet->src_ipaddr, buffer, sizeof(buffer)),
1325                        packet->src_port, packet->id);
1326                 rad_free(&packet);
1327                 return 0;
1328         }
1329
1330 #if 0
1331         /*
1332          *      Commented out until the rest of the code is added.
1333          */
1334         request = received_proxy_tcp_response(packet,
1335                                               fr_listen2tcp(listener));
1336 #endif
1337         if (!request) {
1338                 return 0;
1339         }
1340
1341         rad_assert(fun != NULL);
1342         *pfun = fun;
1343         *prequest = request;
1344
1345         return 1;
1346 }
1347 #endif
1348 #endif
1349
1350
1351 static int client_socket_encode(UNUSED rad_listen_t *listener, REQUEST *request)
1352 {
1353         if (!request->reply->code) return 0;
1354
1355         rad_encode(request->reply, request->packet,
1356                    request->client->secret);
1357         rad_sign(request->reply, request->packet,
1358                  request->client->secret);
1359
1360         return 0;
1361 }
1362
1363
1364 static int client_socket_decode(UNUSED rad_listen_t *listener, REQUEST *request)
1365 {
1366         if (rad_verify(request->packet, NULL,
1367                        request->client->secret) < 0) {
1368                 return -1;
1369         }
1370
1371         return rad_decode(request->packet, NULL,
1372                           request->client->secret);
1373 }
1374
1375 #ifdef WITH_PROXY
1376 static int proxy_socket_encode(UNUSED rad_listen_t *listener, REQUEST *request)
1377 {
1378         rad_encode(request->proxy, NULL, request->home_server->secret);
1379         rad_sign(request->proxy, NULL, request->home_server->secret);
1380
1381         return 0;
1382 }
1383
1384
1385 static int proxy_socket_decode(UNUSED rad_listen_t *listener, REQUEST *request)
1386 {
1387         /*
1388          *      rad_verify is run in event.c, received_proxy_response()
1389          */
1390
1391         return rad_decode(request->proxy_reply, request->proxy,
1392                            request->home_server->secret);
1393 }
1394 #endif
1395
1396 #include "dhcpd.c"
1397
1398 #include "command.c"
1399
1400 static const rad_listen_master_t master_listen[RAD_LISTEN_MAX] = {
1401 #ifdef WITH_STATS
1402         { common_socket_parse, NULL,
1403           stats_socket_recv, auth_socket_send,
1404           socket_print, client_socket_encode, client_socket_decode },
1405 #else
1406         /*
1407          *      This always gets defined.
1408          */
1409         { NULL, NULL, NULL, NULL, NULL, NULL, NULL},    /* RAD_LISTEN_NONE */
1410 #endif
1411
1412 #ifdef WITH_PROXY
1413         /* proxying */
1414         { common_socket_parse, NULL,
1415           proxy_socket_recv, proxy_socket_send,
1416           socket_print, proxy_socket_encode, proxy_socket_decode },
1417 #endif
1418
1419         /* authentication */
1420         { common_socket_parse, NULL,
1421           auth_socket_recv, auth_socket_send,
1422           socket_print, client_socket_encode, client_socket_decode },
1423
1424 #ifdef WITH_ACCOUNTING
1425         /* accounting */
1426         { common_socket_parse, NULL,
1427           acct_socket_recv, acct_socket_send,
1428           socket_print, client_socket_encode, client_socket_decode},
1429 #endif
1430
1431 #ifdef WITH_DETAIL
1432         /* detail */
1433         { detail_parse, detail_free,
1434           detail_recv, detail_send,
1435           detail_print, detail_encode, detail_decode },
1436 #endif
1437
1438 #ifdef WITH_VMPS
1439         /* vlan query protocol */
1440         { common_socket_parse, NULL,
1441           vqp_socket_recv, vqp_socket_send,
1442           socket_print, vqp_socket_encode, vqp_socket_decode },
1443 #endif
1444
1445 #ifdef WITH_DHCP
1446         /* dhcp query protocol */
1447         { dhcp_socket_parse, NULL,
1448           dhcp_socket_recv, dhcp_socket_send,
1449           socket_print, dhcp_socket_encode, dhcp_socket_decode },
1450 #endif
1451
1452 #ifdef WITH_COMMAND_SOCKET
1453         /* TCP command socket */
1454         { command_socket_parse, NULL,
1455           command_domain_accept, command_domain_send,
1456           command_socket_print, command_socket_encode, command_socket_decode },
1457 #endif
1458
1459 #ifdef WITH_COA
1460         /* Change of Authorization */
1461         { common_socket_parse, NULL,
1462           coa_socket_recv, auth_socket_send, /* CoA packets are same as auth */
1463           socket_print, client_socket_encode, client_socket_decode },
1464 #endif
1465
1466 };
1467
1468
1469
1470 /*
1471  *      Binds a listener to a socket.
1472  */
1473 static int listen_bind(rad_listen_t *this)
1474 {
1475         int rcode;
1476         struct sockaddr_storage salocal;
1477         socklen_t       salen;
1478         listen_socket_t *sock = this->data;
1479
1480         /*
1481          *      If the port is zero, then it means the appropriate
1482          *      thing from /etc/services.
1483          */
1484         if (sock->port == 0) {
1485                 struct servent  *svp;
1486
1487                 switch (this->type) {
1488                 case RAD_LISTEN_AUTH:
1489                         svp = getservbyname ("radius", "udp");
1490                         if (svp != NULL) {
1491                                 sock->port = ntohs(svp->s_port);
1492                         } else {
1493                                 sock->port = PW_AUTH_UDP_PORT;
1494                         }
1495                         break;
1496
1497 #ifdef WITH_ACCOUNTING
1498                 case RAD_LISTEN_ACCT:
1499                         svp = getservbyname ("radacct", "udp");
1500                         if (svp != NULL) {
1501                                 sock->port = ntohs(svp->s_port);
1502                         } else {
1503                                 sock->port = PW_ACCT_UDP_PORT;
1504                         }
1505                         break;
1506 #endif
1507
1508 #ifdef WITH_PROXY
1509                 case RAD_LISTEN_PROXY:
1510                         sock->port = 0;
1511                         break;
1512 #endif
1513
1514 #ifdef WITH_VMPS
1515                 case RAD_LISTEN_VQP:
1516                         sock->port = 1589;
1517                         break;
1518 #endif
1519
1520 #ifdef WITH_COA
1521                 case RAD_LISTEN_COA:
1522                         sock->port = PW_COA_UDP_PORT;
1523                         break;
1524 #endif
1525
1526                 default:
1527                         radlog(L_ERR, "ERROR: Non-fatal internal sanity check failed in bind.");
1528                         return -1;
1529                 }
1530         }
1531
1532         /*
1533          *      Copy fr_socket() here, as we may need to bind to a device.
1534          */
1535         this->fd = socket(sock->ipaddr.af, SOCK_DGRAM, 0);
1536         if (this->fd < 0) {
1537                 radlog(L_ERR, "Failed opening socket: %s", strerror(errno));
1538                 return -1;
1539         }
1540
1541 #ifdef SO_BINDTODEVICE
1542         /*
1543          *      Bind to a device BEFORE touching IP addresses.
1544          */
1545         if (sock->interface) {
1546                 struct ifreq ifreq;
1547                 strcpy(ifreq.ifr_name, sock->interface);
1548
1549                 fr_suid_up();
1550                 rcode = setsockopt(this->fd, SOL_SOCKET, SO_BINDTODEVICE,
1551                                    (char *)&ifreq, sizeof(ifreq));
1552                 fr_suid_down();
1553                 if (rcode < 0) {
1554                         close(this->fd);
1555                         radlog(L_ERR, "Failed binding to interface %s: %s",
1556                                sock->interface, strerror(errno));
1557                         return -1;
1558                 } /* else it worked. */
1559         }
1560 #endif
1561
1562 #ifdef WITH_UDPFROMTO
1563         /*
1564          *      Initialize udpfromto for all sockets.
1565          */
1566         if (udpfromto_init(this->fd) != 0) {
1567                 close(this->fd);
1568                 return -1;
1569         }
1570 #endif
1571
1572         /*
1573          *      Set up sockaddr stuff.
1574          */
1575         if (!fr_ipaddr2sockaddr(&sock->ipaddr, sock->port, &salocal, &salen)) {
1576                 close(this->fd);
1577                 return -1;
1578         }
1579
1580 #ifdef HAVE_STRUCT_SOCKADDR_IN6
1581         if (sock->ipaddr.af == AF_INET6) {
1582                 /*
1583                  *      Listening on '::' does NOT get you IPv4 to
1584                  *      IPv6 mapping.  You've got to listen on an IPv4
1585                  *      address, too.  This makes the rest of the server
1586                  *      design a little simpler.
1587                  */
1588 #ifdef IPV6_V6ONLY
1589
1590                 if (IN6_IS_ADDR_UNSPECIFIED(&sock->ipaddr.ipaddr.ip6addr)) {
1591                         int on = 1;
1592
1593                         setsockopt(this->fd, IPPROTO_IPV6, IPV6_V6ONLY,
1594                                    (char *)&on, sizeof(on));
1595                 }
1596 #endif /* IPV6_V6ONLY */
1597         }
1598 #endif /* HAVE_STRUCT_SOCKADDR_IN6 */
1599
1600
1601         if (sock->ipaddr.af == AF_INET) {
1602                 UNUSED int flag;
1603
1604 #if defined(IP_MTU_DISCOVER) && defined(IP_PMTUDISC_DONT)
1605                 /*
1606                  *      Disable PMTU discovery.  On Linux, this
1607                  *      also makes sure that the "don't fragment"
1608                  *      flag is zero.
1609                  */
1610                 flag = IP_PMTUDISC_DONT;
1611                 setsockopt(this->fd, IPPROTO_IP, IP_MTU_DISCOVER,
1612                            &flag, sizeof(flag));
1613 #endif
1614
1615 #if defined(IP_DONTFRAG)
1616                 /*
1617                  *      Ensure that the "don't fragment" flag is zero.
1618                  */
1619                 flag = 0;
1620                 setsockopt(this->fd, IPPROTO_IP, IP_DONTFRAG,
1621                            &flag, sizeof(flag));
1622 #endif
1623         }
1624
1625         /*
1626          *      May be binding to priviledged ports.
1627          */
1628         fr_suid_up();
1629         rcode = bind(this->fd, (struct sockaddr *) &salocal, salen);
1630         fr_suid_down();
1631         if (rcode < 0) {
1632                 char buffer[256];
1633                 close(this->fd);
1634
1635                 this->print(this, buffer, sizeof(buffer));
1636                 radlog(L_ERR, "Failed binding to %s: %s\n",
1637                        buffer, strerror(errno));
1638                 return -1;
1639         }
1640
1641         /*
1642          *      FreeBSD jail issues.  We bind to 0.0.0.0, but the
1643          *      kernel instead binds us to a 1.2.3.4.  If this
1644          *      happens, notice, and remember our real IP.
1645          */
1646         {
1647                 struct sockaddr_storage src;
1648                 socklen_t               sizeof_src = sizeof(src);
1649
1650                 memset(&src, 0, sizeof_src);
1651                 if (getsockname(this->fd, (struct sockaddr *) &src,
1652                                 &sizeof_src) < 0) {
1653                         radlog(L_ERR, "Failed getting socket name: %s",
1654                                strerror(errno));
1655                         return -1;
1656                 }
1657
1658                 if (!fr_sockaddr2ipaddr(&src, sizeof_src,
1659                                         &sock->ipaddr, &sock->port)) {
1660                         radlog(L_ERR, "Socket has unsupported address family");
1661                         return -1;
1662                 }
1663         }
1664
1665 #ifdef O_NONBLOCK
1666         {
1667                 int flags;
1668
1669                 if ((flags = fcntl(this->fd, F_GETFL, NULL)) < 0)  {
1670                         radlog(L_ERR, "Failure getting socket flags: %s)\n",
1671                                strerror(errno));
1672                         return -1;
1673                 }
1674
1675                 flags |= O_NONBLOCK;
1676                 if( fcntl(this->fd, F_SETFL, flags) < 0) {
1677                         radlog(L_ERR, "Failure setting socket flags: %s)\n",
1678                                strerror(errno));
1679                         return -1;
1680                 }
1681         }
1682 #endif
1683
1684         return 0;
1685 }
1686
1687
1688 /*
1689  *      Allocate & initialize a new listener.
1690  */
1691 static rad_listen_t *listen_alloc(RAD_LISTEN_TYPE type)
1692 {
1693         rad_listen_t *this;
1694
1695         this = rad_malloc(sizeof(*this));
1696         memset(this, 0, sizeof(*this));
1697
1698         this->type = type;
1699         this->recv = master_listen[this->type].recv;
1700         this->send = master_listen[this->type].send;
1701         this->print = master_listen[this->type].print;
1702         this->encode = master_listen[this->type].encode;
1703         this->decode = master_listen[this->type].decode;
1704
1705         switch (type) {
1706 #ifdef WITH_STATS
1707         case RAD_LISTEN_NONE:
1708 #endif
1709         case RAD_LISTEN_AUTH:
1710 #ifdef WITH_ACCOUNTING
1711         case RAD_LISTEN_ACCT:
1712 #endif
1713 #ifdef WITH_PROXY
1714         case RAD_LISTEN_PROXY:
1715 #endif
1716 #ifdef WITH_VMPS
1717         case RAD_LISTEN_VQP:
1718 #endif
1719 #ifdef WITH_COA
1720         case RAD_LISTEN_COA:
1721 #endif
1722                 this->data = rad_malloc(sizeof(listen_socket_t));
1723                 memset(this->data, 0, sizeof(listen_socket_t));
1724                 break;
1725
1726 #ifdef WITH_DHCP
1727         case RAD_LISTEN_DHCP:
1728                 this->data = rad_malloc(sizeof(dhcp_socket_t));
1729                 memset(this->data, 0, sizeof(dhcp_socket_t));
1730                 break;
1731 #endif
1732
1733 #ifdef WITH_DETAIL
1734         case RAD_LISTEN_DETAIL:
1735                 this->data = NULL;
1736                 break;
1737 #endif
1738
1739 #ifdef WITH_COMMAND_SOCKET
1740         case RAD_LISTEN_COMMAND:
1741                 this->data = rad_malloc(sizeof(fr_command_socket_t));
1742                 memset(this->data, 0, sizeof(fr_command_socket_t));
1743                 break;
1744 #endif
1745
1746         default:
1747                 rad_assert("Unsupported option!" == NULL);
1748                 break;
1749         }
1750
1751         return this;
1752 }
1753
1754
1755 #ifdef WITH_PROXY
1756 /*
1757  *      Externally visible function for creating a new proxy LISTENER.
1758  *
1759  *      Not thread-safe, but all calls to it are protected by the
1760  *      proxy mutex in event.c
1761  */
1762 rad_listen_t *proxy_new_listener(fr_ipaddr_t *ipaddr, int exists)
1763 {
1764         int last_proxy_port, port;
1765         rad_listen_t *this, *tmp, **last;
1766         listen_socket_t *sock, *old;
1767
1768         /*
1769          *      Find an existing proxy socket to copy.
1770          */
1771         last_proxy_port = 0;
1772         old = NULL;
1773         last = &mainconfig.listen;
1774         for (tmp = mainconfig.listen; tmp != NULL; tmp = tmp->next) {
1775                 /*
1776                  *      Not proxy, ignore it.
1777                  */
1778                 if (tmp->type != RAD_LISTEN_PROXY) continue;
1779
1780                 sock = tmp->data;
1781
1782                 /*
1783                  *      If we were asked to copy a specific one, do
1784                  *      so.  If we're just finding one that already
1785                  *      exists, return a pointer to it.  Otherwise,
1786                  *      create ANOTHER one with the same IP address.
1787                  */
1788                 if ((ipaddr->af != AF_UNSPEC) &&
1789                     (fr_ipaddr_cmp(&sock->ipaddr, ipaddr) != 0)) {
1790                         if (exists) return tmp;
1791                         continue;
1792                 }
1793
1794                 if (sock->port > last_proxy_port) {
1795                         last_proxy_port = sock->port + 1;
1796                 }
1797                 if (!old) old = sock;
1798
1799                 last = &(tmp->next);
1800         }
1801
1802         if (!old) {
1803                 /*
1804                  *      The socket MUST already exist if we're binding
1805                  *      to an address while proxying.
1806                  *
1807                  *      If we're initializing the server, it's OK for the
1808                  *      socket to NOT exist.
1809                  */
1810                 if (!exists) return NULL;
1811
1812                 this = listen_alloc(RAD_LISTEN_PROXY);
1813
1814                 sock = this->data;
1815                 sock->ipaddr = *ipaddr;
1816
1817         } else {
1818                 this = listen_alloc(RAD_LISTEN_PROXY);
1819
1820                 sock = this->data;
1821                 sock->ipaddr = old->ipaddr;
1822         }
1823
1824         /*
1825          *      Keep going until we find an unused port.
1826          */
1827         for (port = last_proxy_port; port < 64000; port++) {
1828                 int rcode;
1829
1830                 sock->port = port;
1831
1832                 rcode = listen_bind(this);
1833                 if (rcode < 0) {
1834                         listen_free(&this);
1835                         return NULL;
1836                 }
1837
1838                 /*
1839                  *      Add the new listener to the list of
1840                  *      listeners.
1841                  */
1842                 *last = this;
1843                 return this;
1844         }
1845
1846         listen_free(&this);
1847         return NULL;
1848 }
1849 #endif
1850
1851 static const FR_NAME_NUMBER listen_compare[] = {
1852 #ifdef WITH_STATS
1853         { "status",     RAD_LISTEN_NONE },
1854 #endif
1855         { "auth",       RAD_LISTEN_AUTH },
1856 #ifdef WITH_ACCOUNTING
1857         { "acct",       RAD_LISTEN_ACCT },
1858 #endif
1859 #ifdef WITH_DETAIL
1860         { "detail",     RAD_LISTEN_DETAIL },
1861 #endif
1862 #ifdef WITH_PROXY
1863         { "proxy",      RAD_LISTEN_PROXY },
1864 #endif
1865 #ifdef WITH_VMPS
1866         { "vmps",       RAD_LISTEN_VQP },
1867 #endif
1868 #ifdef WITH_DHCP
1869         { "dhcp",       RAD_LISTEN_DHCP },
1870 #endif
1871 #ifdef WITH_COMMAND_SOCKET
1872         { "control",    RAD_LISTEN_COMMAND },
1873 #endif
1874 #ifdef WITH_COA
1875         { "coa",        RAD_LISTEN_COA },
1876 #endif
1877         { NULL, 0 },
1878 };
1879
1880
1881 static rad_listen_t *listen_parse(CONF_SECTION *cs, const char *server)
1882 {
1883         int             type, rcode;
1884         char            *listen_type;
1885         rad_listen_t    *this;
1886
1887         listen_type = NULL;
1888
1889         cf_log_info(cs, "listen {");
1890
1891         rcode = cf_item_parse(cs, "type", PW_TYPE_STRING_PTR,
1892                               &listen_type, "");
1893         if (rcode < 0) return NULL;
1894         if (rcode == 1) {
1895                 free(listen_type);
1896                 cf_log_err(cf_sectiontoitem(cs),
1897                            "No type specified in listen section");
1898                 return NULL;
1899         }
1900
1901         type = fr_str2int(listen_compare, listen_type, -1);
1902         if (type < 0) {
1903                 cf_log_err(cf_sectiontoitem(cs),
1904                            "Invalid type \"%s\" in listen section.",
1905                            listen_type);
1906                 free(listen_type);
1907                 return NULL;
1908         }
1909         free(listen_type);
1910
1911         /*
1912          *      Allow listen sections in the default config to
1913          *      refer to a server.
1914          */
1915         if (!server) {
1916                 rcode = cf_item_parse(cs, "virtual_server", PW_TYPE_STRING_PTR,
1917                                       &server, NULL);
1918                 if (rcode == 1) { /* compatiblity with 2.0-pre */
1919                         rcode = cf_item_parse(cs, "server", PW_TYPE_STRING_PTR,
1920                                               &server, NULL);
1921                 }
1922                 if (rcode < 0) return NULL;
1923         }
1924
1925         /*
1926          *      Set up cross-type data.
1927          */
1928         this = listen_alloc(type);
1929         this->server = server;
1930         this->fd = -1;
1931
1932         /*
1933          *      Call per-type parser.
1934          */
1935         if (master_listen[type].parse(cs, this) < 0) {
1936                 listen_free(&this);
1937                 return NULL;
1938         }
1939
1940         cf_log_info(cs, "}");
1941
1942         return this;
1943 }
1944
1945 /*
1946  *      Generate a list of listeners.  Takes an input list of
1947  *      listeners, too, so we don't close sockets with waiting packets.
1948  */
1949 int listen_init(CONF_SECTION *config, rad_listen_t **head)
1950 {
1951         int             override = FALSE;
1952         int             rcode;
1953         CONF_SECTION    *cs = NULL;
1954         rad_listen_t    **last;
1955         rad_listen_t    *this;
1956         fr_ipaddr_t     server_ipaddr;
1957         int             auth_port = 0;
1958 #ifdef WITH_PROXY
1959         int             defined_proxy = 0;
1960 #endif
1961
1962         /*
1963          *      We shouldn't be called with a pre-existing list.
1964          */
1965         rad_assert(head && (*head == NULL));
1966
1967         last = head;
1968         server_ipaddr.af = AF_UNSPEC;
1969
1970         /*
1971          *      If the port is specified on the command-line,
1972          *      it over-rides the configuration file.
1973          *
1974          *      FIXME: If argv[0] == "vmpsd", then don't listen on auth/acct!
1975          */
1976         if (mainconfig.port >= 0) auth_port = mainconfig.port;
1977
1978         /*
1979          *      If the IP address was configured on the command-line,
1980          *      use that as the "bind_address"
1981          */
1982         if (mainconfig.myip.af != AF_UNSPEC) {
1983                 memcpy(&server_ipaddr, &mainconfig.myip,
1984                        sizeof(server_ipaddr));
1985                 override = TRUE;
1986                 goto bind_it;
1987         }
1988
1989         /*
1990          *      Else look for bind_address and/or listen sections.
1991          */
1992         server_ipaddr.ipaddr.ip4addr.s_addr = htonl(INADDR_NONE);
1993         rcode = cf_item_parse(config, "bind_address",
1994                               PW_TYPE_IPADDR,
1995                               &server_ipaddr.ipaddr.ip4addr, NULL);
1996         if (rcode < 0) return -1; /* error parsing it */
1997
1998         if (rcode == 0) { /* successfully parsed IPv4 */
1999                 listen_socket_t *sock;
2000                 server_ipaddr.af = AF_INET;
2001
2002                 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'.");
2003
2004         bind_it:
2005 #ifdef WITH_VMPS
2006                 if (strcmp(progname, "vmpsd") == 0) {
2007                         this = listen_alloc(RAD_LISTEN_VQP);
2008                         if (!auth_port) auth_port = 1589;
2009                 } else
2010 #endif
2011                         this = listen_alloc(RAD_LISTEN_AUTH);
2012
2013                 sock = this->data;
2014
2015                 sock->ipaddr = server_ipaddr;
2016                 sock->port = auth_port;
2017
2018                 sock->clients = clients_parse_section(config);
2019                 if (!sock->clients) {
2020                         cf_log_err(cf_sectiontoitem(config),
2021                                    "Failed to find any clients for this listen section");
2022                         listen_free(&this);
2023                         return -1;
2024                 }
2025
2026                 if (listen_bind(this) < 0) {
2027                         listen_free(head);
2028                         radlog(L_ERR, "There appears to be another RADIUS server running on the authentication port %d", sock->port);
2029                         listen_free(&this);
2030                         return -1;
2031                 }
2032                 auth_port = sock->port; /* may have been updated in listen_bind */
2033                 if (override) {
2034                         cs = cf_section_sub_find_name2(config, "server",
2035                                                        mainconfig.name);
2036                         if (cs) this->server = mainconfig.name;
2037                 }
2038
2039                 *last = this;
2040                 last = &(this->next);
2041
2042 #ifdef WITH_VMPS
2043                 /*
2044                  *      No acct for vmpsd
2045                  */
2046                 if (strcmp(progname, "vmpsd") == 0) goto do_proxy;
2047 #endif
2048
2049 #ifdef WITH_ACCOUNTING
2050                 /*
2051                  *      Open Accounting Socket.
2052                  *
2053                  *      If we haven't already gotten acct_port from
2054                  *      /etc/services, then make it auth_port + 1.
2055                  */
2056                 this = listen_alloc(RAD_LISTEN_ACCT);
2057                 sock = this->data;
2058
2059                 /*
2060                  *      Create the accounting socket.
2061                  *
2062                  *      The accounting port is always the
2063                  *      authentication port + 1
2064                  */
2065                 sock->ipaddr = server_ipaddr;
2066                 sock->port = auth_port + 1;
2067
2068                 sock->clients = clients_parse_section(config);
2069                 if (!sock->clients) {
2070                         cf_log_err(cf_sectiontoitem(config),
2071                                    "Failed to find any clients for this listen section");
2072                         return -1;
2073                 }
2074
2075                 if (listen_bind(this) < 0) {
2076                         listen_free(&this);
2077                         listen_free(head);
2078                         radlog(L_ERR, "There appears to be another RADIUS server running on the accounting port %d", sock->port);
2079                         return -1;
2080                 }
2081
2082                 if (override) {
2083                         cs = cf_section_sub_find_name2(config, "server",
2084                                                        mainconfig.name);
2085                         if (cs) this->server = mainconfig.name;
2086                 }
2087
2088                 *last = this;
2089                 last = &(this->next);
2090 #endif
2091         } else if (mainconfig.port > 0) { /* no bind address, but a port */
2092                 radlog(L_ERR, "The command-line says \"-p %d\", but there is no associated IP address to use",
2093                        mainconfig.port);
2094                 return -1;
2095         }
2096
2097         /*
2098          *      They specified an IP on the command-line, ignore
2099          *      all listen sections except the one in '-n'.
2100          */
2101         if (mainconfig.myip.af != AF_UNSPEC) {
2102                 CONF_SECTION *subcs;
2103                 const char *name2 = cf_section_name2(cs);
2104
2105                 cs = cf_section_sub_find_name2(config, "server",
2106                                                mainconfig.name);
2107                 if (!cs) goto do_proxy;
2108
2109                 /*
2110                  *      Should really abstract this code...
2111                  */
2112                 for (subcs = cf_subsection_find_next(cs, NULL, "listen");
2113                      subcs != NULL;
2114                      subcs = cf_subsection_find_next(cs, subcs, "listen")) {
2115                         this = listen_parse(subcs, name2);
2116                         if (!this) {
2117                                 listen_free(head);
2118                                 return -1;
2119                         }
2120
2121 #ifdef WITH_PROXY
2122                         if (this->type == RAD_LISTEN_PROXY) defined_proxy = 1;
2123 #endif
2124
2125                         *last = this;
2126                         last = &(this->next);
2127                 } /* loop over "listen" directives in server <foo> */
2128
2129                 goto do_proxy;
2130         }
2131
2132         /*
2133          *      Walk through the "listen" sections, if they exist.
2134          */
2135         for (cs = cf_subsection_find_next(config, NULL, "listen");
2136              cs != NULL;
2137              cs = cf_subsection_find_next(config, cs, "listen")) {
2138                 this = listen_parse(cs, NULL);
2139                 if (!this) {
2140                         listen_free(head);
2141                         return -1;
2142                 }
2143
2144 #ifdef WITH_PROXY
2145                 if (this->type == RAD_LISTEN_PROXY) defined_proxy = 1;
2146 #endif
2147
2148                 *last = this;
2149                 last = &(this->next);
2150         }
2151
2152         /*
2153          *      Check virtual servers for "listen" sections, too.
2154          *
2155          *      FIXME: Move to virtual server init?
2156          */
2157         for (cs = cf_subsection_find_next(config, NULL, "server");
2158              cs != NULL;
2159              cs = cf_subsection_find_next(config, cs, "server")) {
2160                 CONF_SECTION *subcs;
2161                 const char *name2 = cf_section_name2(cs);
2162
2163                 for (subcs = cf_subsection_find_next(cs, NULL, "listen");
2164                      subcs != NULL;
2165                      subcs = cf_subsection_find_next(cs, subcs, "listen")) {
2166                         this = listen_parse(subcs, name2);
2167                         if (!this) {
2168                                 listen_free(head);
2169                                 return -1;
2170                         }
2171
2172 #ifdef WITH_PROXY
2173                         if (this->type == RAD_LISTEN_PROXY) {
2174                                 radlog(L_ERR, "Error: listen type \"proxy\" Cannot appear in a virtual server section");
2175                                 listen_free(head);
2176                                 return -1;
2177                         }
2178 #endif
2179
2180                         *last = this;
2181                         last = &(this->next);
2182                 } /* loop over "listen" directives in virtual servers */
2183         } /* loop over virtual servers */
2184
2185         /*
2186          *      If we're proxying requests, open the proxy FD.
2187          *      Otherwise, don't do anything.
2188          */
2189  do_proxy:
2190 #ifdef WITH_PROXY
2191         if (mainconfig.proxy_requests == TRUE) {
2192                 int             port = -1;
2193                 listen_socket_t *sock = NULL;
2194
2195                 /*
2196                  *      No sockets to receive packets, therefore
2197                  *      proxying is pointless.
2198                  */
2199                 if (!*head) return -1;
2200
2201                 if (defined_proxy) goto check_home_servers;
2202
2203                 /*
2204                  *      Find the first authentication port,
2205                  *      and use it
2206                  */
2207                 for (this = *head; this != NULL; this = this->next) {
2208                         if (this->type == RAD_LISTEN_AUTH) {
2209                                 sock = this->data;
2210                                 if (server_ipaddr.af == AF_UNSPEC) {
2211                                         server_ipaddr = sock->ipaddr;
2212                                 }
2213                                 port = sock->port + 2; /* skip acct port */
2214                                 break;
2215                         }
2216 #ifdef WITH_VMPS
2217                         if (this->type == RAD_LISTEN_VQP) {
2218                                 sock = this->data;
2219                                 if (server_ipaddr.af == AF_UNSPEC) {
2220                                         server_ipaddr = sock->ipaddr;
2221                                 }
2222                                 port = sock->port + 1;
2223                                 break;
2224                         }
2225 #endif
2226                 }
2227
2228                 if (port < 0) port = 1024 + (fr_rand() & 0x1ff);
2229
2230                 /*
2231                  *      Address is still unspecified, use IPv4.
2232                  */
2233                 if (server_ipaddr.af == AF_UNSPEC) {
2234                         server_ipaddr.af = AF_INET;
2235                         server_ipaddr.ipaddr.ip4addr.s_addr = htonl(INADDR_ANY);
2236                 }
2237
2238                 this = listen_alloc(RAD_LISTEN_PROXY);
2239                 sock = this->data;
2240
2241                 /*
2242                  *      Create the first proxy socket.
2243                  */
2244                 sock->ipaddr = server_ipaddr;
2245
2246                 /*
2247                  *      Try to find a proxy port (value doesn't matter)
2248                  */
2249                 for (sock->port = port;
2250                      sock->port < 64000;
2251                      sock->port++) {
2252                         if (listen_bind(this) == 0) {
2253                                 *last = this;
2254                                 last = &(this->next); /* just in case */
2255                                 break;
2256                         }
2257                 }
2258
2259                 if (sock->port >= 64000) {
2260                         listen_free(head);
2261                         listen_free(&this);
2262                         radlog(L_ERR, "Failed to open socket for proxying");
2263                         return -1;
2264                 }
2265
2266                 /*
2267                  *      Create *additional* proxy listeners, based
2268                  *      on their src_ipaddr.
2269                  */
2270         check_home_servers:
2271                 if (home_server_create_listeners(*head) != 0) return -1;
2272         }
2273 #endif
2274
2275         return 0;
2276 }
2277
2278 /*
2279  *      Free a linked list of listeners;
2280  */
2281 void listen_free(rad_listen_t **head)
2282 {
2283         rad_listen_t *this;
2284
2285         if (!head || !*head) return;
2286
2287         this = *head;
2288         while (this) {
2289                 rad_listen_t *next = this->next;
2290
2291                 /*
2292                  *      Other code may have eaten the FD.
2293                  */
2294                 if (this->fd >= 0) close(this->fd);
2295
2296                 if (master_listen[this->type].free) {
2297                         master_listen[this->type].free(this);
2298                 }
2299                 free(this->data);
2300                 free(this);
2301
2302                 this = next;
2303         }
2304
2305         *head = NULL;
2306 }
2307
2308 #ifdef WITH_TCP
2309 fr_tcp_radius_t *fr_listen2tcp(rad_listen_t *this)
2310 {
2311         listen_socket_t *sock;
2312
2313         if (!this || (this->type != RAD_LISTEN_PROXY) || !this->data) {
2314                 return NULL;
2315         }
2316
2317         sock = this->data;
2318         return sock->tcp;
2319 }
2320
2321 rad_listen_t *proxy_new_tcp_listener(home_server *home)
2322 {
2323         int i;
2324         fr_tcp_radius_t *tcp;
2325         struct sockaddr_storage src;
2326         socklen_t sizeof_src = sizeof(src);
2327         rad_listen_t *this;
2328         listen_socket_t *sock;
2329
2330         if (!home ||
2331             ((home->max_connections > 0) &&
2332              (home->num_connections >= home->max_connections))) {
2333                 DEBUG("WARNING: Home server has too many open connections (%d)",
2334                       home->max_connections);
2335                 return NULL;
2336         }
2337
2338         this = NULL;
2339
2340         /*
2341          *      FIXME: Move to RBTrees.
2342          */
2343         for (i = 0; i < home->max_connections; i++) {
2344                 if (home->listeners[i]) continue;
2345
2346                 this = home->listeners[i] = listen_alloc(RAD_LISTEN_PROXY);
2347                 if (!this) {
2348                         DEBUG("WARNING: Failed allocating memory");
2349                         return NULL;
2350                 }
2351                 break;
2352         }
2353
2354         if (!this) {
2355                 DEBUG("WARNING: Failed to find a free connection slot");
2356                 return NULL;
2357         }
2358         sock = this->data;
2359
2360         tcp = sock->tcp = rad_malloc(sizeof(*tcp));
2361         memset(tcp, 0, sizeof(*tcp));
2362
2363         /*
2364          *      Initialize th
2365          *
2366          *      Open a new socket...
2367          *
2368          *      Do stuff...
2369          */
2370         tcp->dst_ipaddr = home->ipaddr;
2371         tcp->dst_port = home->port;
2372         tcp->lifetime = home->lifetime;
2373         tcp->opened = time(NULL);
2374
2375         /*
2376          *      FIXME: connect() is blocking!
2377          *      We do this with the proxy mutex locked, which may
2378          *      cause large delays!
2379          *
2380          *      http://www.developerweb.net/forum/showthread.php?p=13486
2381          */
2382         this->fd = tcp->fd = fr_tcp_client_socket(&tcp->dst_ipaddr, tcp->dst_port);
2383         if (tcp->fd < 0) {
2384                 listen_free(&this);
2385                 DEBUG("WARNING: Failed opening socket to home server");
2386                 return NULL;
2387         }
2388         memset(&src, 0, sizeof_src);
2389         if (getsockname(tcp->fd, (struct sockaddr *) &src, &sizeof_src) < 0) {
2390                 close(tcp->fd);
2391                 listen_free(&this);
2392                 return NULL;
2393         }
2394
2395         if (!fr_sockaddr2ipaddr(&src, sizeof_src,
2396                                 &tcp->src_ipaddr, &tcp->src_port)) {
2397                 close(tcp->fd);
2398                 listen_free(&this);
2399                 return NULL;
2400         }
2401
2402         /*
2403          *      Fill in socket information.
2404          */
2405         sock->proto = IPPROTO_TCP;
2406         sock->tcp = tcp;
2407
2408         sock->ipaddr = tcp->src_ipaddr;
2409         sock->port = tcp->src_port;
2410
2411         /*
2412          *      Don't ask.  Just don't ask.
2413          */
2414         sock->src_ipaddr = tcp->dst_ipaddr;
2415         sock->src_port = tcp->dst_port;
2416         sock->home = home;
2417         sock->home->num_connections++;
2418
2419         this->recv = proxy_socket_tcp_recv;
2420
2421         /*
2422          *      Tell the event handler about the new socket.
2423          *
2424          *      It keeps track of "this", so we don't have to insert
2425          *      it into the main list of listeners.
2426          */
2427         event_new_fd(this);
2428
2429         return this;
2430 }
2431
2432 void proxy_close_tcp_listener(rad_listen_t *listener)
2433 {
2434         int i;
2435         listen_socket_t *sock = listener->data;
2436
2437         /*
2438          *      This is the second time around for the socket.  Free
2439          *      the memory now.
2440          */
2441         if (listener->status != RAD_LISTEN_STATUS_KNOWN) {
2442                 listen_free(&listener);
2443                 return;
2444         }
2445
2446         listener->status = RAD_LISTEN_STATUS_CLOSED;
2447         event_new_fd(listener);
2448
2449         /*
2450          *      Find the home server, and mark this listener as
2451          *      no longer being active.
2452          */
2453         for (i = 0; i < sock->home->max_connections; i++) {
2454                 if (sock->home->listeners[i] == listener) {
2455                         sock->home->listeners[i] = NULL;
2456                         sock->home->num_connections--;
2457                         break;
2458                 }
2459         }
2460
2461         /*
2462          *      There are still one or more requests using this socket.
2463          *      leave it marked as "closed", but don't free it.  When the
2464          *      last requeast using it is cleaned up, it will be deleted.
2465          */
2466         if (sock->tcp->used > 0) return;
2467
2468         listen_free(&listener);
2469 }
2470 #endif
2471
2472 #ifdef WITH_STATS
2473 RADCLIENT_LIST *listener_find_client_list(const fr_ipaddr_t *ipaddr,
2474                                           int port)
2475 {
2476         rad_listen_t *this;
2477
2478         for (this = mainconfig.listen; this != NULL; this = this->next) {
2479                 listen_socket_t *sock;
2480
2481                 if ((this->type != RAD_LISTEN_AUTH) &&
2482                     (this->type != RAD_LISTEN_ACCT)) continue;
2483
2484                 sock = this->data;
2485
2486                 if ((sock->port == port) &&
2487                     (fr_ipaddr_cmp(ipaddr, &sock->ipaddr) == 0)) {
2488                         return sock->clients;
2489                 }
2490         }
2491
2492         return NULL;
2493 }
2494 #endif
2495
2496 rad_listen_t *listener_find_byipaddr(const fr_ipaddr_t *ipaddr, int port)
2497 {
2498         rad_listen_t *this;
2499
2500         for (this = mainconfig.listen; this != NULL; this = this->next) {
2501                 listen_socket_t *sock;
2502
2503                 /*
2504                  *      FIXME: For TCP, ignore the *secondary*
2505                  *      listeners associated with the main socket.
2506                  */
2507                 if ((this->type != RAD_LISTEN_AUTH) &&
2508                     (this->type != RAD_LISTEN_ACCT)) continue;
2509
2510                 sock = this->data;
2511
2512                 if ((sock->port == port) &&
2513                     (fr_ipaddr_cmp(ipaddr, &sock->ipaddr) == 0)) {
2514                         return this;
2515                 }
2516
2517                 if ((sock->port == port) &&
2518                     ((sock->ipaddr.af == AF_INET) &&
2519                      (sock->ipaddr.ipaddr.ip4addr.s_addr == INADDR_ANY))) {
2520                         return this;
2521                 }
2522
2523 #ifdef HAVE_STRUCT_SOCKADDR_IN6
2524                 if ((sock->port == port) &&
2525                     (sock->ipaddr.af == AF_INET6) &&
2526                     (IN6_IS_ADDR_UNSPECIFIED(&sock->ipaddr.ipaddr.ip6addr))) {
2527                         return this;
2528                 }
2529 #endif
2530         }
2531
2532         return NULL;
2533 }