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 /*
  78  *      Find a per-socket client.
  79  */
  80 RADCLIENT *client_listener_find(const rad_listen_t *listener,
  81                                        const fr_ipaddr_t *ipaddr)
  82 {
  83 #ifdef WITH_DYNAMIC_CLIENTS
  84         int rcode;
  85         time_t now;
  86         listen_socket_t *sock;
  87         REQUEST *request;
  88         RADCLIENT *client, *created;
  89 #endif
  90         RADCLIENT_LIST *clients;
  91
  92         rad_assert(listener != NULL);
  93         rad_assert(ipaddr != NULL);
  94
  95         rad_assert((listener->type == RAD_LISTEN_AUTH) ||
  96 #ifdef WITH_STATS
  97                    (listener->type == RAD_LISTEN_NONE) ||
  98 #endif
  99 #ifdef WITH_ACCOUNTING
 100                    (listener->type == RAD_LISTEN_ACCT) ||
 101 #endif
 102 #ifdef WITH_VMPS
 103                    (listener->type == RAD_LISTEN_VQP) ||
 104 #endif
 105                    (listener->type == RAD_LISTEN_DHCP));
 106
 107         clients = ((listen_socket_t *)listener->data)->clients;
 108
 109         /*
 110          *      This HAS to have been initialized previously.
 111          */
 112         rad_assert(clients != NULL);
 113
 114 #ifdef WITH_DYNAMIC_CLIENTS
 115         client = client_find(clients, ipaddr);
 116         if (!client) return NULL;
 117
 118         /*
 119          *      No server defined, and it's not dynamic.  Return it.
 120          */
 121         if (!client->client_server && !client->dynamic) return client;
 122
 123         now = time(NULL);
 124
 125         /*
 126          *      It's a dynamically generated client, check it.
 127          */
 128         if (client->dynamic) {
 129                 /*
 130                  *      Lives forever.  Return it.
 131                  */
 132                 if (client->lifetime == 0) return client;
 133
 134                 /*
 135                  *      Rate-limit the deletion of known clients.
 136                  *      This makes them last a little longer, but
 137                  *      prevents the server from melting down if (say)
 138                  *      10k clients all expire at once.
 139                  */
 140                 if (now == client->last_new_client) return client;
 141
 142                 /*
 143                  *      It's not dead yet.  Return it.
 144                  */
 145                 if ((client->created + client->lifetime) > now) return client;
 146
 147                 /*
 148                  *      It's dead, Jim.  Delete it.
 149                  */
 150                 client_delete(clients, client);
 151
 152                 /*
 153                  *      Go find the enclosing network again.
 154                  */
 155                 client = client_find(clients, ipaddr);
 156
 157                 /*
 158                  *      WTF?
 159                  */
 160                 if (!client) return NULL;
 161                 if (!client->client_server) return NULL;
 162
 163                 /*
 164                  *      At this point, 'client' is the enclosing
 165                  *      network that configures where dynamic clients
 166                  *      can be defined.
 167                  */
 168                 rad_assert(client->dynamic == 0);
 169         } else {
 170                 /*
 171                  *      The IP is unknown, so we've found an enclosing
 172                  *      network.  Enable DoS protection.  We only
 173                  *      allow one new client per second.  Known
 174                  *      clients aren't subject to this restriction.
 175                  */
 176                 if (now == client->last_new_client) return NULL;
 177         }
 178
 179         client->last_new_client = now;
 180
 181         request = request_alloc();
 182         if (!request) return NULL;
 183
 184         request->listener = listener;
 185         request->client = client;
 186         request->packet = rad_alloc(0);
 187         if (!request->packet) {
 188                 request_free(&request);
 189                 return NULL;
 190         }
 191         request->reply = rad_alloc(0);
 192         if (!request->reply) {
 193                 request_free(&request);
 194                 return NULL;
 195         }
 196         request->packet->timestamp = request->timestamp;
 197         request->number = 0;
 198         request->priority = listener->type;
 199         request->server = client->client_server;
 200         request->root = &mainconfig;
 201
 202         /*
 203          *      Run a fake request through the given virtual server.
 204          *      Look for FreeRADIUS-Client-IP-Address
 205          *               FreeRADIUS-Client-Secret
 206          *              ...
 207          *
 208          *      and create the RADCLIENT structure from that.
 209          */
 210
 211         sock = listener->data;
 212         request->packet->sockfd = listener->fd;
 213         request->packet->src_ipaddr = *ipaddr;
 214         request->packet->src_port = 0; /* who cares... */
 215         request->packet->dst_ipaddr = sock->ipaddr;
 216         request->packet->dst_port = sock->port;
 217
 218         request->reply->sockfd = request->packet->sockfd;
 219         request->reply->dst_ipaddr = request->packet->src_ipaddr;
 220         request->reply->src_ipaddr = request->packet->dst_ipaddr;
 221         request->reply->dst_port = request->packet->src_port;
 222         request->reply->src_port = request->packet->dst_port;
 223         request->reply->id = request->packet->id;
 224         request->reply->code = 0; /* UNKNOWN code */
 225
 226
 227         DEBUG("server %s {", request->server);
 228
 229         rcode = module_authorize(0, request);
 230
 231         DEBUG("} # server %s", request->server);
 232
 233         if (rcode != RLM_MODULE_OK) {
 234                 request_free(&request);
 235                 return NULL;
 236         }
 237
 238         created = client_create(clients, request);
 239
 240         request_free(&request);
 241
 242         return created;         /* may be NULL */
 243 #else
 244         return client_find(clients, ipaddr);
 245 #endif
 246 }
 247
 248 static int listen_bind(rad_listen_t *this);
 249
 250
 251 /*
 252  *      Process and reply to a server-status request.
 253  *      Like rad_authenticate and rad_accounting this should
 254  *      live in it's own file but it's so small we don't bother.
 255  */
 256 static int rad_status_server(REQUEST *request)
 257 {
 258         int rcode = RLM_MODULE_OK;
 259         DICT_VALUE *dval;
 260
 261         switch (request->listener->type) {
 262 #ifdef WITH_STATS
 263         case RAD_LISTEN_NONE:
 264 #endif
 265         case RAD_LISTEN_AUTH:
 266                 dval = dict_valbyname(PW_AUTZ_TYPE, "Status-Server");
 267                 if (dval) {
 268                         rcode = module_authorize(dval->value, request);
 269                 } else {
 270                         rcode = RLM_MODULE_OK;
 271                 }
 272
 273                 switch (rcode) {
 274                 case RLM_MODULE_OK:
 275                 case RLM_MODULE_UPDATED:
 276                         request->reply->code = PW_AUTHENTICATION_ACK;
 277                         break;
 278
 279                 case RLM_MODULE_FAIL:
 280                 case RLM_MODULE_HANDLED:
 281                         request->reply->code = 0; /* don't reply */
 282                         break;
 283
 284                 default:
 285                 case RLM_MODULE_REJECT:
 286                         request->reply->code = PW_AUTHENTICATION_REJECT;
 287                         break;
 288                 }
 289                 break;
 290
 291 #ifdef WITH_ACCOUNTING
 292         case RAD_LISTEN_ACCT:
 293                 dval = dict_valbyname(PW_ACCT_TYPE, "Status-Server");
 294                 if (dval) {
 295                         rcode = module_accounting(dval->value, request);
 296                 } else {
 297                         rcode = RLM_MODULE_OK;
 298                 }
 299
 300                 switch (rcode) {
 301                 case RLM_MODULE_OK:
 302                 case RLM_MODULE_UPDATED:
 303                         request->reply->code = PW_ACCOUNTING_RESPONSE;
 304                         break;
 305
 306                 default:
 307                         request->reply->code = 0; /* don't reply */
 308                         break;
 309                 }
 310                 break;
 311 #endif
 312
 313         default:
 314                 return 0;
 315         }
 316
 317 #ifdef WITH_STATS
 318         request_stats_reply(request);
 319 #endif
 320
 321         return 0;
 322 }
 323
 324
 325 static int socket_print(rad_listen_t *this, char *buffer, size_t bufsize)
 326 {
 327         size_t len;
 328         listen_socket_t *sock = this->data;
 329         const char *name;
 330
 331         switch (this->type) {
 332 #ifdef WITH_STATS
 333         case RAD_LISTEN_NONE:   /* what a hack... */
 334                 name = "status";
 335                 break;
 336 #endif
 337
 338         case RAD_LISTEN_AUTH:
 339                 name = "authentication";
 340                 break;
 341
 342 #ifdef WITH_ACCOUNTING
 343         case RAD_LISTEN_ACCT:
 344                 name = "accounting";
 345                 break;
 346 #endif
 347
 348 #ifdef WITH_PROXY
 349         case RAD_LISTEN_PROXY:
 350                 name = "proxy";
 351                 break;
 352 #endif
 353
 354 #ifdef WITH_VMPS
 355         case RAD_LISTEN_VQP:
 356                 name = "vmps";
 357                 break;
 358 #endif
 359
 360 #ifdef WITH_DHCP
 361         case RAD_LISTEN_DHCP:
 362                 name = "dhcp";
 363                 break;
 364 #endif
 365
 366         default:
 367                 name = "??";
 368                 break;
 369         }
 370
 371 #define FORWARD len = strlen(buffer); if (len >= (bufsize + 1)) return 0;buffer += len;bufsize -= len
 372 #define ADDSTRING(_x) strlcpy(buffer, _x, bufsize);FORWARD
 373
 374         ADDSTRING(name);
 375
 376 #ifdef SO_BINDTODEVICE
 377         if (sock->interface) {
 378                 ADDSTRING(" interface ");
 379                 ADDSTRING(sock->interface);
 380         }
 381 #endif
 382
 383         ADDSTRING(" address ");
 384
 385         if ((sock->ipaddr.af == AF_INET) &&
 386             (sock->ipaddr.ipaddr.ip4addr.s_addr == htonl(INADDR_ANY))) {
 387                 strlcpy(buffer, "*", bufsize);
 388         } else {
 389                 ip_ntoh(&sock->ipaddr, buffer, bufsize);
 390         }
 391         FORWARD;
 392
 393         ADDSTRING(" port ");
 394         snprintf(buffer, bufsize, "%d", sock->port);
 395         FORWARD;
 396
 397         if (this->server) {
 398                 ADDSTRING(" as server ");
 399                 ADDSTRING(this->server);
 400         }
 401
 402 #undef ADDSTRING
 403 #undef FORWARD
 404
 405         return 1;
 406 }
 407
 408
 409 /*
 410  *      Parse an authentication or accounting socket.
 411  */
 412 static int common_socket_parse(CONF_SECTION *cs, rad_listen_t *this)
 413 {
 414         int             rcode;
 415         int             listen_port;
 416         fr_ipaddr_t     ipaddr;
 417         listen_socket_t *sock = this->data;
 418         char            *section_name = NULL;
 419         CONF_SECTION    *client_cs, *parentcs;
 420
 421         /*
 422          *      Try IPv4 first
 423          */
 424         ipaddr.ipaddr.ip4addr.s_addr = htonl(INADDR_NONE);
 425         rcode = cf_item_parse(cs, "ipaddr", PW_TYPE_IPADDR,
 426                               &ipaddr.ipaddr.ip4addr, NULL);
 427         if (rcode < 0) return -1;
 428
 429         if (rcode == 0) { /* successfully parsed IPv4 */
 430                 ipaddr.af = AF_INET;
 431
 432         } else {        /* maybe IPv6? */
 433                 rcode = cf_item_parse(cs, "ipv6addr", PW_TYPE_IPV6ADDR,
 434                                       &ipaddr.ipaddr.ip6addr, NULL);
 435                 if (rcode < 0) return -1;
 436
 437                 if (rcode == 1) {
 438                         cf_log_err(cf_sectiontoitem(cs),
 439                                    "No address specified in listen section");
 440                         return -1;
 441                 }
 442                 ipaddr.af = AF_INET6;
 443         }
 444
 445         rcode = cf_item_parse(cs, "port", PW_TYPE_INTEGER,
 446                               &listen_port, "0");
 447         if (rcode < 0) return -1;
 448
 449         if ((listen_port < 0) || (listen_port > 65500)) {
 450                         cf_log_err(cf_sectiontoitem(cs),
 451                                    "Invalid value for \"port\"");
 452                         return -1;
 453         }
 454
 455         sock->ipaddr = ipaddr;
 456         sock->port = listen_port;
 457
 458         /*
 459          *      If we can bind to interfaces, do so,
 460          *      else don't.
 461          */
 462         if (cf_pair_find(cs, "interface")) {
 463 #ifndef SO_BINDTODEVICE
 464                 cf_log_err(cf_sectiontoitem(cs),
 465                            "System does not support binding to interfaces.  Delete this line from the configuration file.");
 466                 return -1;
 467 #else
 468                 const char *value;
 469                 CONF_PAIR *cp = cf_pair_find(cs, "interface");
 470
 471                 rad_assert(cp != NULL);
 472                 value = cf_pair_value(cp);
 473                 if (!value) {
 474                         cf_log_err(cf_sectiontoitem(cs),
 475                                    "No interface name given");
 476                         return -1;
 477                 }
 478                 sock->interface = value;
 479 #endif
 480         }
 481
 482         /*
 483          *      And bind it to the port.
 484          */
 485         if (listen_bind(this) < 0) {
 486                 char buffer[128];
 487                 cf_log_err(cf_sectiontoitem(cs),
 488                            "Error binding to port for %s port %d",
 489                            ip_ntoh(&sock->ipaddr, buffer, sizeof(buffer)),
 490                            sock->port);
 491                 return -1;
 492         }
 493
 494 #ifdef WITH_PROXY
 495         /*
 496          *      Proxy sockets don't have clients.
 497          */
 498         if (this->type == RAD_LISTEN_PROXY) return 0;
 499 #endif
 500
 501         /*
 502          *      The more specific configurations are preferred to more
 503          *      generic ones.
 504          */
 505         client_cs = NULL;
 506         parentcs = cf_top_section(cs);
 507         rcode = cf_item_parse(cs, "clients", PW_TYPE_STRING_PTR,
 508                               &section_name, NULL);
 509         if (rcode < 0) return -1; /* bad string */
 510         if (rcode == 0) {
 511                 /*
 512                  *      Explicit list given: use it.
 513                  */
 514                 client_cs = cf_section_sub_find_name2(parentcs,
 515                                                       "clients",
 516                                                       section_name);
 517                 if (!client_cs) {
 518                         client_cs = cf_section_find(section_name);
 519                 }
 520                 if (!client_cs) {
 521                         cf_log_err(cf_sectiontoitem(cs),
 522                                    "Failed to find clients %s {...}",
 523                                    section_name);
 524                         free(section_name);
 525                         return -1;
 526                 }
 527                 free(section_name);
 528         } /* else there was no "clients = " entry. */
 529
 530         if (!client_cs) {
 531                 CONF_SECTION *server_cs;
 532
 533                 server_cs = cf_section_sub_find_name2(parentcs,
 534                                                       "server",
 535                                                       this->server);
 536                 /*
 537                  *      Found a "server foo" section.  If there are clients
 538                  *      in it, use them.
 539                  */
 540                 if (server_cs &&
 541                     (cf_section_sub_find(server_cs, "client") != NULL)) {
 542                         client_cs = server_cs;
 543                 }
 544         }
 545
 546         /*
 547          *      Still nothing.  Look for global clients.
 548          */
 549         if (!client_cs) client_cs = parentcs;
 550
 551         sock->clients = clients_parse_section(client_cs);
 552         if (!sock->clients) {
 553                 cf_log_err(cf_sectiontoitem(cs),
 554                            "Failed to load clients for this listen section");
 555                 return -1;
 556         }
 557
 558         return 0;
 559 }
 560
 561 /*
 562  *      Send an authentication response packet
 563  */
 564 static int auth_socket_send(rad_listen_t *listener, REQUEST *request)
 565 {
 566         rad_assert(request->listener == listener);
 567         rad_assert(listener->send == auth_socket_send);
 568
 569         return rad_send(request->reply, request->packet,
 570                         request->client->secret);
 571 }
 572
 573
 574 #ifdef WITH_ACCOUNTING
 575 /*
 576  *      Send an accounting response packet (or not)
 577  */
 578 static int acct_socket_send(rad_listen_t *listener, REQUEST *request)
 579 {
 580         rad_assert(request->listener == listener);
 581         rad_assert(listener->send == acct_socket_send);
 582
 583         /*
 584          *      Accounting reject's are silently dropped.
 585          *
 586          *      We do it here to avoid polluting the rest of the
 587          *      code with this knowledge
 588          */
 589         if (request->reply->code == 0) return 0;
 590
 591         return rad_send(request->reply, request->packet,
 592                         request->client->secret);
 593 }
 594 #endif
 595
 596 #ifdef WITH_PROXY
 597 /*
 598  *      Send a packet to a home server.
 599  *
 600  *      FIXME: have different code for proxy auth & acct!
 601  */
 602 static int proxy_socket_send(rad_listen_t *listener, REQUEST *request)
 603 {
 604         listen_socket_t *sock = listener->data;
 605
 606         rad_assert(request->proxy_listener == listener);
 607         rad_assert(listener->send == proxy_socket_send);
 608
 609         request->proxy->src_ipaddr = sock->ipaddr;
 610         request->proxy->src_port = sock->port;
 611
 612         return rad_send(request->proxy, request->packet,
 613                         request->home_server->secret);
 614 }
 615 #endif
 616
 617 #ifdef WITH_STATS
 618 /*
 619  *      Check if an incoming request is "ok"
 620  *
 621  *      It takes packets, not requests.  It sees if the packet looks
 622  *      OK.  If so, it does a number of sanity checks on it.
 623   */
 624 static int stats_socket_recv(rad_listen_t *listener,
 625                             RAD_REQUEST_FUNP *pfun, REQUEST **prequest)
 626 {
 627         ssize_t         rcode;
 628         int             code, src_port;
 629         RADIUS_PACKET   *packet;
 630         char            buffer[128];
 631         RADCLIENT       *client;
 632         fr_ipaddr_t     src_ipaddr;
 633
 634         rcode = rad_recv_header(listener->fd, &src_ipaddr, &src_port, &code);
 635         if (rcode < 0) return 0;
 636
 637         RAD_STATS_TYPE_INC(listener, total_requests);
 638
 639         if (rcode < 20) {       /* AUTH_HDR_LEN */
 640                 RAD_STATS_TYPE_INC(listener, total_malformed_requests);
 641                 return 0;
 642         }
 643
 644         /*
 645          *      We only understand Status-Server on this socket.
 646          */
 647         if (code != PW_STATUS_SERVER) {
 648                 DEBUG("Ignoring packet code %d sent to Status-Server port",
 649                       code);
 650                 rad_recv_discard(listener->fd);
 651                 RAD_STATS_TYPE_INC(listener, total_unknown_types);
 652                 RAD_STATS_CLIENT_INC(listener, client, total_unknown_types);
 653                 return 0;
 654         }
 655
 656         if ((client = client_listener_find(listener,
 657                                            &src_ipaddr)) == NULL) {
 658                 rad_recv_discard(listener->fd);
 659                 RAD_STATS_TYPE_INC(listener, total_invalid_requests);
 660
 661                 if (debug_flag > 0) {
 662                         char name[1024];
 663
 664                         listener->print(listener, name, sizeof(name));
 665
 666                         /*
 667                          *      This is debugging rather than logging, so that
 668                          *      DoS attacks don't affect us.
 669                          */
 670                         DEBUG("Ignoring request to %s from unknown client %s port %d",
 671                               name,
 672                               inet_ntop(src_ipaddr.af, &src_ipaddr.ipaddr,
 673                                         buffer, sizeof(buffer)), src_port);
 674                 }
 675
 676                 return 0;
 677         }
 678
 679         /*
 680          *      Now that we've sanity checked everything, receive the
 681          *      packet.
 682          */
 683         packet = rad_recv(listener->fd, 1); /* require message authenticator */
 684         if (!packet) {
 685                 RAD_STATS_TYPE_INC(listener, total_malformed_requests);
 686                 DEBUG("%s", librad_errstr);
 687                 return 0;
 688         }
 689
 690         if (!received_request(listener, packet, prequest, client)) {
 691                 RAD_STATS_TYPE_INC(listener, total_packets_dropped);
 692                 RAD_STATS_CLIENT_INC(listener, client, total_packets_dropped);
 693                 rad_free(&packet);
 694                 return 0;
 695         }
 696
 697         *pfun = rad_status_server;
 698         return 1;
 699 }
 700 #endif
 701
 702
 703 /*
 704  *      Check if an incoming request is "ok"
 705  *
 706  *      It takes packets, not requests.  It sees if the packet looks
 707  *      OK.  If so, it does a number of sanity checks on it.
 708   */
 709 static int auth_socket_recv(rad_listen_t *listener,
 710                             RAD_REQUEST_FUNP *pfun, REQUEST **prequest)
 711 {
 712         ssize_t         rcode;
 713         int             code, src_port;
 714         RADIUS_PACKET   *packet;
 715         RAD_REQUEST_FUNP fun = NULL;
 716         char            buffer[128];
 717         RADCLIENT       *client;
 718         fr_ipaddr_t     src_ipaddr;
 719
 720         rcode = rad_recv_header(listener->fd, &src_ipaddr, &src_port, &code);
 721         if (rcode < 0) return 0;
 722
 723         RAD_STATS_TYPE_INC(listener, total_requests);
 724
 725         if (rcode < 20) {       /* AUTH_HDR_LEN */
 726                 RAD_STATS_TYPE_INC(listener, total_malformed_requests);
 727                 return 0;
 728         }
 729
 730         if ((client = client_listener_find(listener,
 731                                            &src_ipaddr)) == NULL) {
 732                 rad_recv_discard(listener->fd);
 733                 RAD_STATS_TYPE_INC(listener, total_invalid_requests);
 734
 735                 if (debug_flag > 0) {
 736                         char name[1024];
 737
 738                         listener->print(listener, name, sizeof(name));
 739
 740                         /*
 741                          *      This is debugging rather than logging, so that
 742                          *      DoS attacks don't affect us.
 743                          */
 744                         DEBUG("Ignoring request to %s from unknown client %s port %d",
 745                               name,
 746                               inet_ntop(src_ipaddr.af, &src_ipaddr.ipaddr,
 747                                         buffer, sizeof(buffer)), src_port);
 748                 }
 749
 750                 return 0;
 751         }
 752
 753         /*
 754          *      Some sanity checks, based on the packet code.
 755          */
 756         switch(code) {
 757         case PW_AUTHENTICATION_REQUEST:
 758                 RAD_STATS_CLIENT_INC(listener, client, total_requests);
 759                 fun = rad_authenticate;
 760                 break;
 761
 762         case PW_STATUS_SERVER:
 763                 if (!mainconfig.status_server) {
 764                         rad_recv_discard(listener->fd);
 765                         RAD_STATS_TYPE_INC(listener, total_packets_dropped);
 766                         RAD_STATS_CLIENT_INC(listener, client, total_packets_dropped);
 767                         DEBUG("WARNING: Ignoring Status-Server request due to security configuration");
 768                         return 0;
 769                 }
 770                 fun = rad_status_server;
 771                 break;
 772
 773         default:
 774                 rad_recv_discard(listener->fd);
 775                 RAD_STATS_INC(radius_auth_stats.total_unknown_types);
 776                 RAD_STATS_CLIENT_INC(listener, client, total_unknown_types);
 777
 778                 DEBUG("Invalid packet code %d sent to authentication port from client %s port %d : IGNORED",
 779                       code, client->shortname, src_port);
 780                 return 0;
 781                 break;
 782         } /* switch over packet types */
 783
 784         /*
 785          *      Now that we've sanity checked everything, receive the
 786          *      packet.
 787          */
 788         packet = rad_recv(listener->fd, client->message_authenticator);
 789         if (!packet) {
 790                 RAD_STATS_TYPE_INC(listener, total_malformed_requests);
 791                 DEBUG("%s", librad_errstr);
 792                 return 0;
 793         }
 794
 795         if (!received_request(listener, packet, prequest, client)) {
 796                 RAD_STATS_TYPE_INC(listener, total_packets_dropped);
 797                 RAD_STATS_CLIENT_INC(listener, client, total_packets_dropped);
 798                 rad_free(&packet);
 799                 return 0;
 800         }
 801
 802         *pfun = fun;
 803         return 1;
 804 }
 805
 806
 807 #ifdef WITH_ACCOUNTING
 808 /*
 809  *      Receive packets from an accounting socket
 810  */
 811 static int acct_socket_recv(rad_listen_t *listener,
 812                             RAD_REQUEST_FUNP *pfun, REQUEST **prequest)
 813 {
 814         ssize_t         rcode;
 815         int             code, src_port;
 816         RADIUS_PACKET   *packet;
 817         RAD_REQUEST_FUNP fun = NULL;
 818         char            buffer[128];
 819         RADCLIENT       *client;
 820         fr_ipaddr_t     src_ipaddr;
 821
 822         rcode = rad_recv_header(listener->fd, &src_ipaddr, &src_port, &code);
 823         if (rcode < 0) return 0;
 824
 825         RAD_STATS_TYPE_INC(listener, total_requests);
 826
 827         if (rcode < 20) {       /* AUTH_HDR_LEN */
 828                 RAD_STATS_TYPE_INC(listener, total_malformed_requests);
 829                 return 0;
 830         }
 831
 832         if ((client = client_listener_find(listener,
 833                                            &src_ipaddr)) == NULL) {
 834                 rad_recv_discard(listener->fd);
 835                 RAD_STATS_TYPE_INC(listener, total_invalid_requests);
 836
 837                 /*
 838                  *      This is debugging rather than logging, so that
 839                  *      DoS attacks don't affect us.
 840                  */
 841                 if (debug_flag > 0) {
 842                         char name[1024];
 843
 844                         listener->print(listener, name, sizeof(name));
 845
 846                         DEBUG("Ignoring request to %s from unknown client %s port %d",
 847                               name,
 848                               inet_ntop(src_ipaddr.af, &src_ipaddr.ipaddr,
 849                                         buffer, sizeof(buffer)), src_port);
 850                 }
 851
 852                 return 0;
 853         }
 854
 855         /*
 856          *      Some sanity checks, based on the packet code.
 857          */
 858         switch(code) {
 859         case PW_ACCOUNTING_REQUEST:
 860                 RAD_STATS_CLIENT_INC(listener, client, total_requests);
 861                 fun = rad_accounting;
 862                 break;
 863
 864         case PW_STATUS_SERVER:
 865                 if (!mainconfig.status_server) {
 866                         rad_recv_discard(listener->fd);
 867                         RAD_STATS_TYPE_INC(listener, total_packets_dropped);
 868                         RAD_STATS_CLIENT_INC(listener, client, total_unknown_types);
 869
 870                         DEBUG("WARNING: Ignoring Status-Server request due to security configuration");
 871                         return 0;
 872                 }
 873                 fun = rad_status_server;
 874                 break;
 875
 876         default:
 877                 rad_recv_discard(listener->fd);
 878                 RAD_STATS_TYPE_INC(listener, total_unknown_types);
 879                 RAD_STATS_CLIENT_INC(listener, client, total_unknown_types);
 880
 881                 DEBUG("Invalid packet code %d sent to a accounting port from client %s port %d : IGNORED",
 882                       code, client->shortname, src_port);
 883                 return 0;
 884         } /* switch over packet types */
 885
 886         /*
 887          *      Now that we've sanity checked everything, receive the
 888          *      packet.
 889          */
 890         packet = rad_recv(listener->fd, 0);
 891         if (!packet) {
 892                 RAD_STATS_TYPE_INC(listener, total_malformed_requests);
 893                 radlog(L_ERR, "%s", librad_errstr);
 894                 return 0;
 895         }
 896
 897         /*
 898          *      There can be no duplicate accounting packets.
 899          */
 900         if (!received_request(listener, packet, prequest, client)) {
 901                 RAD_STATS_TYPE_INC(listener, total_packets_dropped);
 902                 RAD_STATS_CLIENT_INC(listener, client, total_packets_dropped);
 903                 rad_free(&packet);
 904                 return 0;
 905         }
 906
 907         *pfun = fun;
 908         return 1;
 909 }
 910 #endif
 911
 912 #ifdef WITH_PROXY
 913 /*
 914  *      Recieve packets from a proxy socket.
 915  */
 916 static int proxy_socket_recv(rad_listen_t *listener,
 917                               RAD_REQUEST_FUNP *pfun, REQUEST **prequest)
 918 {
 919         REQUEST         *request;
 920         RADIUS_PACKET   *packet;
 921         RAD_REQUEST_FUNP fun = NULL;
 922         char            buffer[128];
 923
 924         packet = rad_recv(listener->fd, 0);
 925         if (!packet) {
 926                 radlog(L_ERR, "%s", librad_errstr);
 927                 return 0;
 928         }
 929
 930         /*
 931          *      FIXME: Client MIB updates?
 932          */
 933         switch(packet->code) {
 934         case PW_AUTHENTICATION_ACK:
 935         case PW_ACCESS_CHALLENGE:
 936         case PW_AUTHENTICATION_REJECT:
 937                 fun = rad_authenticate;
 938                 break;
 939
 940 #ifdef WITH_ACCOUNTING
 941         case PW_ACCOUNTING_RESPONSE:
 942                 fun = rad_accounting;
 943                 break;
 944 #endif
 945
 946         default:
 947                 /*
 948                  *      FIXME: Update MIB for packet types?
 949                  */
 950                 radlog(L_ERR, "Invalid packet code %d sent to a proxy port "
 951                        "from home server %s port %d - ID %d : IGNORED",
 952                        packet->code,
 953                        ip_ntoh(&packet->src_ipaddr, buffer, sizeof(buffer)),
 954                        packet->src_port, packet->id);
 955                 rad_free(&packet);
 956                 return 0;
 957         }
 958
 959         request = received_proxy_response(packet);
 960         if (!request) {
 961                 return 0;
 962         }
 963
 964         rad_assert(fun != NULL);
 965         *pfun = fun;
 966         *prequest = request;
 967
 968         return 1;
 969 }
 970 #endif
 971
 972
 973 static int client_socket_encode(UNUSED rad_listen_t *listener, REQUEST *request)
 974 {
 975         if (!request->reply->code) return 0;
 976
 977         rad_encode(request->reply, request->packet,
 978                    request->client->secret);
 979         rad_sign(request->reply, request->packet,
 980                  request->client->secret);
 981
 982         return 0;
 983 }
 984
 985
 986 static int client_socket_decode(UNUSED rad_listen_t *listener, REQUEST *request)
 987 {
 988         if (rad_verify(request->packet, NULL,
 989                        request->client->secret) < 0) {
 990                 return -1;
 991         }
 992
 993         return rad_decode(request->packet, NULL,
 994                           request->client->secret);
 995 }
 996
 997 #ifdef WITH_PROXY
 998 static int proxy_socket_encode(UNUSED rad_listen_t *listener, REQUEST *request)
 999 {
1000         rad_encode(request->proxy, NULL, request->home_server->secret);
1001         rad_sign(request->proxy, NULL, request->home_server->secret);
1002
1003         return 0;
1004 }
1005
1006
1007 static int proxy_socket_decode(UNUSED rad_listen_t *listener, REQUEST *request)
1008 {
1009         if (rad_verify(request->proxy_reply, request->proxy,
1010                        request->home_server->secret) < 0) {
1011                 return -1;
1012         }
1013
1014         return rad_decode(request->proxy_reply, request->proxy,
1015                            request->home_server->secret);
1016 }
1017 #endif
1018
1019 #include "dhcpd.c"
1020
1021 static const rad_listen_master_t master_listen[RAD_LISTEN_MAX] = {
1022 #ifdef WITH_STATS
1023         { common_socket_parse, NULL,
1024           stats_socket_recv, auth_socket_send,
1025           socket_print, client_socket_encode, client_socket_decode },
1026 #else
1027         { NULL, NULL, NULL, NULL, NULL, NULL, NULL},    /* RAD_LISTEN_NONE */
1028 #endif
1029
1030 #ifdef WITH_PROXY
1031         /* proxying */
1032         { common_socket_parse, NULL,
1033           proxy_socket_recv, proxy_socket_send,
1034           socket_print, proxy_socket_encode, proxy_socket_decode },
1035 #else
1036         { NULL, NULL, NULL, NULL, NULL, NULL, NULL},
1037 #endif
1038
1039         /* authentication */
1040         { common_socket_parse, NULL,
1041           auth_socket_recv, auth_socket_send,
1042           socket_print, client_socket_encode, client_socket_decode },
1043
1044 #ifdef WITH_ACCOUNTING
1045         /* accounting */
1046         { common_socket_parse, NULL,
1047           acct_socket_recv, acct_socket_send,
1048           socket_print, client_socket_encode, client_socket_decode},
1049 #else
1050         { NULL, NULL, NULL, NULL, NULL, NULL, NULL},
1051 #endif
1052
1053 #ifdef WITH_DETAIL
1054         /* detail */
1055         { detail_parse, detail_free,
1056           detail_recv, detail_send,
1057           detail_print, detail_encode, detail_decode },
1058 #else
1059         { NULL, NULL, NULL, NULL, NULL, NULL, NULL},
1060 #endif
1061
1062 #ifdef WITH_VMPS
1063         /* vlan query protocol */
1064         { common_socket_parse, NULL,
1065           vqp_socket_recv, vqp_socket_send,
1066           socket_print, vqp_socket_encode, vqp_socket_decode },
1067 #else
1068         { NULL, NULL, NULL, NULL, NULL, NULL, NULL},
1069 #endif
1070
1071 #ifdef WITH_DHCP
1072         /* dhcp query protocol */
1073         { dhcp_socket_parse, NULL,
1074           dhcp_socket_recv, dhcp_socket_send,
1075           socket_print, dhcp_socket_encode, dhcp_socket_decode },
1076 #else
1077         { NULL, NULL, NULL, NULL, NULL, NULL, NULL},
1078 #endif
1079
1080 };
1081
1082
1083
1084 /*
1085  *      Binds a listener to a socket.
1086  */
1087 static int listen_bind(rad_listen_t *this)
1088 {
1089         struct sockaddr_storage salocal;
1090         socklen_t       salen;
1091         listen_socket_t *sock = this->data;
1092
1093         /*
1094          *      If the port is zero, then it means the appropriate
1095          *      thing from /etc/services.
1096          */
1097         if (sock->port == 0) {
1098                 struct servent  *svp;
1099
1100                 switch (this->type) {
1101                 case RAD_LISTEN_AUTH:
1102                         svp = getservbyname ("radius", "udp");
1103                         if (svp != NULL) {
1104                                 sock->port = ntohs(svp->s_port);
1105                         } else {
1106                                 sock->port = PW_AUTH_UDP_PORT;
1107                         }
1108                         break;
1109
1110 #ifdef WITH_ACCOUNTING
1111                 case RAD_LISTEN_ACCT:
1112                         svp = getservbyname ("radacct", "udp");
1113                         if (svp != NULL) {
1114                                 sock->port = ntohs(svp->s_port);
1115                         } else {
1116                                 sock->port = PW_ACCT_UDP_PORT;
1117                         }
1118                         break;
1119 #endif
1120
1121 #ifdef WITH_PROXY
1122                 case RAD_LISTEN_PROXY:
1123                         sock->port = 0;
1124                         break;
1125 #endif
1126
1127 #ifdef WITH_VMPS
1128                 case RAD_LISTEN_VQP:
1129                         sock->port = 1589;
1130                         break;
1131 #endif
1132
1133                 default:
1134                         radlog(L_ERR, "ERROR: Non-fatal internal sanity check failed in bind.");
1135                         return -1;
1136                 }
1137         }
1138
1139         /*
1140          *      Copy fr_socket() here, as we may need to bind to a device.
1141          */
1142         this->fd = socket(sock->ipaddr.af, SOCK_DGRAM, 0);
1143         if (this->fd < 0) {
1144                 radlog(L_ERR, "Failed opening socket: %s", strerror(errno));
1145                 return -1;
1146         }
1147
1148 #ifdef SO_BINDTODEVICE
1149         /*
1150          *      Bind to a device BEFORE touching IP addresses.
1151          */
1152         if (sock->interface) {
1153                 struct ifreq ifreq;
1154                 strcpy(ifreq.ifr_name, sock->interface);
1155
1156                 if (setsockopt(this->fd, SOL_SOCKET, SO_BINDTODEVICE,
1157                                (char *)&ifreq, sizeof(ifreq)) < 0) {
1158                         close(this->fd);
1159                         radlog(L_ERR, "Failed opening to interface %s: %s",
1160                                sock->interface, strerror(errno));
1161                         return -1;
1162                 } /* else it worked. */
1163         }
1164 #endif
1165
1166 #ifdef WITH_UDPFROMTO
1167         /*
1168          *      Initialize udpfromto for all sockets.
1169          */
1170         if (udpfromto_init(this->fd) != 0) {
1171                 close(this->fd);
1172                 return -1;
1173         }
1174 #endif
1175
1176         /*
1177          *      Set up sockaddr stuff.
1178          */
1179         if (!fr_ipaddr2sockaddr(&sock->ipaddr, sock->port, &salocal, &salen)) {
1180                 close(this->fd);
1181                 return -1;
1182         }
1183
1184 #ifdef HAVE_STRUCT_SOCKADDR_IN6
1185         if (sock->ipaddr.af == AF_INET6) {
1186                 /*
1187                  *      Listening on '::' does NOT get you IPv4 to
1188                  *      IPv6 mapping.  You've got to listen on an IPv4
1189                  *      address, too.  This makes the rest of the server
1190                  *      design a little simpler.
1191                  */
1192 #ifdef IPV6_V6ONLY
1193
1194                 if (IN6_IS_ADDR_UNSPECIFIED(&sock->ipaddr.ipaddr.ip6addr)) {
1195                         int on = 1;
1196
1197                         setsockopt(this->fd, IPPROTO_IPV6, IPV6_V6ONLY,
1198                                    (char *)&on, sizeof(on));
1199                 }
1200 #endif /* IPV6_V6ONLY */
1201 #endif /* HAVE_STRUCT_SOCKADDR_IN6 */
1202         }
1203
1204         if (bind(this->fd, (struct sockaddr *) &salocal, salen) < 0) {
1205                 close(this->fd);
1206                 radlog(L_ERR, "Failed binding to socket: %s\n",
1207                        strerror(errno));
1208                 return -1;
1209         }
1210
1211         /*
1212          *      FreeBSD jail issues.  We bind to 0.0.0.0, but the
1213          *      kernel instead binds us to a 1.2.3.4.  If this
1214          *      happens, notice, and remember our real IP.
1215          */
1216         {
1217                 struct sockaddr_storage src;
1218                 socklen_t               sizeof_src = sizeof(src);
1219
1220                 memset(&src, 0, sizeof_src);
1221                 if (getsockname(this->fd, (struct sockaddr *) &src,
1222                                 &sizeof_src) < 0) {
1223                         radlog(L_ERR, "Failed getting socket name: %s",
1224                                strerror(errno));
1225                         return -1;
1226                 }
1227
1228                 if (!fr_sockaddr2ipaddr(&src, sizeof_src,
1229                                         &sock->ipaddr, &sock->port)) {
1230                         radlog(L_ERR, "Socket has unsupported address family");
1231                         return -1;
1232                 }
1233         }
1234
1235 #ifdef O_NONBLOCK
1236         {
1237                 int flags;
1238
1239                 if ((flags = fcntl(this->fd, F_GETFL, NULL)) < 0)  {
1240                         radlog(L_ERR, "Failure getting socket flags: %s)\n",
1241                                strerror(errno));
1242                         return -1;
1243                 }
1244
1245                 flags |= O_NONBLOCK;
1246                 if( fcntl(this->fd, F_SETFL, flags) < 0) {
1247                         radlog(L_ERR, "Failure setting socket flags: %s)\n",
1248                                strerror(errno));
1249                         return -1;
1250                 }
1251         }
1252 #endif
1253
1254         return 0;
1255 }
1256
1257
1258 /*
1259  *      Allocate & initialize a new listener.
1260  */
1261 static rad_listen_t *listen_alloc(RAD_LISTEN_TYPE type)
1262 {
1263         rad_listen_t *this;
1264
1265         this = rad_malloc(sizeof(*this));
1266         memset(this, 0, sizeof(*this));
1267
1268         this->type = type;
1269         this->recv = master_listen[this->type].recv;
1270         this->send = master_listen[this->type].send;
1271         this->print = master_listen[this->type].print;
1272         this->encode = master_listen[this->type].encode;
1273         this->decode = master_listen[this->type].decode;
1274
1275         switch (type) {
1276 #ifdef WITH_STATS
1277         case RAD_LISTEN_NONE:
1278 #endif
1279         case RAD_LISTEN_AUTH:
1280         case RAD_LISTEN_ACCT:
1281         case RAD_LISTEN_PROXY:
1282         case RAD_LISTEN_VQP:
1283         case RAD_LISTEN_DHCP:
1284                 this->data = rad_malloc(sizeof(listen_socket_t));
1285                 memset(this->data, 0, sizeof(listen_socket_t));
1286                 break;
1287
1288 #ifdef WITH_DETAIL
1289         case RAD_LISTEN_DETAIL:
1290                 this->data = NULL;
1291                 break;
1292 #endif
1293
1294         default:
1295                 rad_assert("Unsupported option!" == NULL);
1296                 break;
1297         }
1298
1299         return this;
1300 }
1301
1302
1303 #ifdef WITH_PROXY
1304 /*
1305  *      Externally visible function for creating a new proxy LISTENER.
1306  *
1307  *      For now, don't take ipaddr or port.
1308  *
1309  *      Not thread-safe, but all calls to it are protected by the
1310  *      proxy mutex in request_list.c
1311  */
1312 rad_listen_t *proxy_new_listener()
1313 {
1314         int last_proxy_port, port;
1315         rad_listen_t *this, *tmp, **last;
1316         listen_socket_t *sock, *old;
1317
1318         this = listen_alloc(RAD_LISTEN_PROXY);
1319
1320         /*
1321          *      Find an existing proxy socket to copy.
1322          *
1323          *      FIXME: Make it per-realm, or per-home server!
1324          */
1325         last_proxy_port = 0;
1326         old = NULL;
1327         last = &mainconfig.listen;
1328         for (tmp = mainconfig.listen; tmp != NULL; tmp = tmp->next) {
1329                 if (tmp->type == RAD_LISTEN_PROXY) {
1330                         sock = tmp->data;
1331                         if (sock->port > last_proxy_port) {
1332                                 last_proxy_port = sock->port + 1;
1333                         }
1334                         if (!old) old = sock;
1335                 }
1336
1337                 last = &(tmp->next);
1338         }
1339
1340         if (!old) {
1341                 listen_free(&this);
1342                 return NULL;    /* This is a serious error. */
1343         }
1344
1345         /*
1346          *      FIXME: find a new IP address to listen on?
1347          *
1348          *      This could likely be done in the "home server"
1349          *      configuration, to have per-home-server source IP's.
1350          */
1351         sock = this->data;
1352         memcpy(&sock->ipaddr, &old->ipaddr, sizeof(sock->ipaddr));
1353
1354         /*
1355          *      Keep going until we find an unused port.
1356          */
1357         for (port = last_proxy_port; port < 64000; port++) {
1358                 sock->port = port;
1359                 if (listen_bind(this) == 0) {
1360                         /*
1361                          *      Add the new listener to the list of
1362                          *      listeners.
1363                          */
1364                         *last = this;
1365                         return this;
1366                 }
1367         }
1368
1369         listen_free(&this);
1370         return NULL;
1371 }
1372 #endif
1373
1374 static const FR_NAME_NUMBER listen_compare[] = {
1375 #ifdef WITH_STATS
1376         { "status",     RAD_LISTEN_NONE },
1377 #endif
1378         { "auth",       RAD_LISTEN_AUTH },
1379 #ifdef WITH_ACCOUNTING
1380         { "acct",       RAD_LISTEN_ACCT },
1381 #endif
1382 #ifdef WITH_DETAIL
1383         { "detail",     RAD_LISTEN_DETAIL },
1384 #endif
1385 #ifdef WITH_PROXY
1386         { "proxy",      RAD_LISTEN_PROXY },
1387 #endif
1388 #ifdef WITH_VMPS
1389         { "vmps",       RAD_LISTEN_VQP },
1390 #endif
1391 #ifdef WITH_DHCP
1392         { "dhcp",       RAD_LISTEN_DHCP },
1393 #endif
1394         { NULL, 0 },
1395 };
1396
1397
1398 static rad_listen_t *listen_parse(CONF_SECTION *cs, const char *server)
1399 {
1400         int             type, rcode;
1401         char            *listen_type;
1402         rad_listen_t    *this;
1403
1404         listen_type = NULL;
1405
1406         cf_log_info(cs, "listen {");
1407
1408         rcode = cf_item_parse(cs, "type", PW_TYPE_STRING_PTR,
1409                               &listen_type, "");
1410         if (rcode < 0) return NULL;
1411         if (rcode == 1) {
1412                 free(listen_type);
1413                 cf_log_err(cf_sectiontoitem(cs),
1414                            "No type specified in listen section");
1415                 return NULL;
1416         }
1417
1418         type = fr_str2int(listen_compare, listen_type, -1);
1419         if (type < 0) {
1420                 cf_log_err(cf_sectiontoitem(cs),
1421                            "Invalid type \"%s\" in listen section.",
1422                            listen_type);
1423                 free(listen_type);
1424                 return NULL;
1425         }
1426         free(listen_type);
1427
1428         /*
1429          *      Allow listen sections in the default config to
1430          *      refer to a server.
1431          */
1432         if (!server) {
1433                 rcode = cf_item_parse(cs, "virtual_server", PW_TYPE_STRING_PTR,
1434                                       &server, NULL);
1435                 if (rcode == 1) { /* compatiblity with 2.0-pre */
1436                         rcode = cf_item_parse(cs, "server", PW_TYPE_STRING_PTR,
1437                                               &server, NULL);
1438                 }
1439                 if (rcode < 0) return NULL;
1440         }
1441
1442         /*
1443          *      Set up cross-type data.
1444          */
1445         this = listen_alloc(type);
1446         this->server = server;
1447         this->fd = -1;
1448
1449         /*
1450          *      Call per-type parser.
1451          */
1452         if (master_listen[type].parse(cs, this) < 0) {
1453                 listen_free(&this);
1454                 return NULL;
1455         }
1456
1457         cf_log_info(cs, "}");
1458
1459         return this;
1460 }
1461
1462 /*
1463  *      Generate a list of listeners.  Takes an input list of
1464  *      listeners, too, so we don't close sockets with waiting packets.
1465  */
1466 int listen_init(CONF_SECTION *config, rad_listen_t **head)
1467 {
1468         int             override = FALSE;
1469         int             rcode;
1470         CONF_SECTION    *cs;
1471         rad_listen_t    **last;
1472         rad_listen_t    *this;
1473         fr_ipaddr_t     server_ipaddr;
1474         int             auth_port = 0;
1475 #ifdef WITH_PROXY
1476         int             defined_proxy = 0;
1477 #endif
1478
1479         /*
1480          *      We shouldn't be called with a pre-existing list.
1481          */
1482         rad_assert(head && (*head == NULL));
1483
1484         last = head;
1485         server_ipaddr.af = AF_UNSPEC;
1486
1487         /*
1488          *      If the port is specified on the command-line,
1489          *      it over-rides the configuration file.
1490          *
1491          *      FIXME: If argv[0] == "vmpsd", then don't listen on auth/acct!
1492          */
1493         if (mainconfig.port >= 0) auth_port = mainconfig.port;
1494
1495         /*
1496          *      If the IP address was configured on the command-line,
1497          *      use that as the "bind_address"
1498          */
1499         if (mainconfig.myip.af != AF_UNSPEC) {
1500                 memcpy(&server_ipaddr, &mainconfig.myip,
1501                        sizeof(server_ipaddr));
1502                 override = TRUE;
1503                 goto bind_it;
1504         }
1505
1506         /*
1507          *      Else look for bind_address and/or listen sections.
1508          */
1509         server_ipaddr.ipaddr.ip4addr.s_addr = htonl(INADDR_NONE);
1510         rcode = cf_item_parse(config, "bind_address",
1511                               PW_TYPE_IPADDR,
1512                               &server_ipaddr.ipaddr.ip4addr, NULL);
1513         if (rcode < 0) return -1; /* error parsing it */
1514
1515         if (rcode == 0) { /* successfully parsed IPv4 */
1516                 listen_socket_t *sock;
1517                 server_ipaddr.af = AF_INET;
1518
1519                 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'.");
1520
1521         bind_it:
1522 #ifdef WITH_VMPS
1523                 if (strcmp(progname, "vmpsd") == 0) {
1524                         this = listen_alloc(RAD_LISTEN_VQP);
1525                         if (!auth_port) auth_port = 1589;
1526                 } else
1527 #endif
1528                         this = listen_alloc(RAD_LISTEN_AUTH);
1529
1530                 sock = this->data;
1531
1532                 sock->ipaddr = server_ipaddr;
1533                 sock->port = auth_port;
1534
1535                 sock->clients = clients_parse_section(config);
1536                 if (!sock->clients) {
1537                         cf_log_err(cf_sectiontoitem(config),
1538                                    "Failed to find any clients for this listen section");
1539                         return -1;
1540                 }
1541
1542                 if (listen_bind(this) < 0) {
1543                         listen_free(&this);
1544                         listen_free(head);
1545                         radlog(L_ERR, "There appears to be another RADIUS server running on the authentication port %d", sock->port);
1546                         return -1;
1547                 }
1548                 auth_port = sock->port; /* may have been updated in listen_bind */
1549                 if (override) {
1550                         cs = cf_section_sub_find_name2(config, "server",
1551                                                        mainconfig.name);
1552                         if (cs) this->server = mainconfig.name;
1553                 }
1554
1555                 *last = this;
1556                 last = &(this->next);
1557
1558 #ifdef WITH_VMPS
1559                 /*
1560                  *      No acct for vmpsd
1561                  */
1562                 if (strcmp(progname, "vmpsd") == 0) goto do_proxy;
1563 #endif
1564
1565 #ifdef WITH_ACCOUNTING
1566                 /*
1567                  *      Open Accounting Socket.
1568                  *
1569                  *      If we haven't already gotten acct_port from
1570                  *      /etc/services, then make it auth_port + 1.
1571                  */
1572                 this = listen_alloc(RAD_LISTEN_ACCT);
1573                 sock = this->data;
1574
1575                 /*
1576                  *      Create the accounting socket.
1577                  *
1578                  *      The accounting port is always the
1579                  *      authentication port + 1
1580                  */
1581                 sock->ipaddr = server_ipaddr;
1582                 sock->port = auth_port + 1;
1583
1584                 sock->clients = clients_parse_section(config);
1585                 if (!sock->clients) {
1586                         cf_log_err(cf_sectiontoitem(config),
1587                                    "Failed to find any clients for this listen section");
1588                         return -1;
1589                 }
1590
1591                 if (listen_bind(this) < 0) {
1592                         listen_free(&this);
1593                         listen_free(head);
1594                         radlog(L_ERR, "There appears to be another RADIUS server running on the accounting port %d", sock->port);
1595                         return -1;
1596                 }
1597
1598                 if (override) {
1599                         cs = cf_section_sub_find_name2(config, "server",
1600                                                        mainconfig.name);
1601                         if (cs) this->server = mainconfig.name;
1602                 }
1603
1604                 *last = this;
1605                 last = &(this->next);
1606 #endif
1607         } else if (mainconfig.port > 0) { /* no bind address, but a port */
1608                 radlog(L_ERR, "The command-line says \"-p %d\", but there is no associated IP address to use",
1609                        mainconfig.port);
1610                 return -1;
1611         }
1612
1613         /*
1614          *      They specified an IP on the command-line, ignore
1615          *      all listen sections except the one in '-n'.
1616          */
1617         if (mainconfig.myip.af != AF_UNSPEC) {
1618                 CONF_SECTION *subcs;
1619                 const char *name2 = cf_section_name2(cs);
1620
1621                 cs = cf_section_sub_find_name2(config, "server",
1622                                                mainconfig.name);
1623                 if (!cs) goto do_proxy;
1624
1625                 /*
1626                  *      Should really abstract this code...
1627                  */
1628                 for (subcs = cf_subsection_find_next(cs, NULL, "listen");
1629                      subcs != NULL;
1630                      subcs = cf_subsection_find_next(cs, subcs, "listen")) {
1631                         this = listen_parse(subcs, name2);
1632                         if (!this) {
1633                                 listen_free(head);
1634                                 return -1;
1635                         }
1636
1637 #ifdef WITH_PROXY
1638                         if (this->type == RAD_LISTEN_PROXY) defined_proxy = 1;
1639 #endif
1640
1641                         *last = this;
1642                         last = &(this->next);
1643                 } /* loop over "listen" directives in server <foo> */
1644
1645                 goto do_proxy;
1646         }
1647
1648         /*
1649          *      Walk through the "listen" sections, if they exist.
1650          */
1651         for (cs = cf_subsection_find_next(config, NULL, "listen");
1652              cs != NULL;
1653              cs = cf_subsection_find_next(config, cs, "listen")) {
1654                 this = listen_parse(cs, NULL);
1655                 if (!this) {
1656                         listen_free(head);
1657                         return -1;
1658                 }
1659
1660 #ifdef WITH_PROXY
1661                 if (this->type == RAD_LISTEN_PROXY) defined_proxy = 1;
1662 #endif
1663
1664                 *last = this;
1665                 last = &(this->next);
1666         }
1667
1668         /*
1669          *      Check virtual servers for "listen" sections, too.
1670          *
1671          *      FIXME: Move to virtual server init?
1672          */
1673         for (cs = cf_subsection_find_next(config, NULL, "server");
1674              cs != NULL;
1675              cs = cf_subsection_find_next(config, cs, "server")) {
1676                 CONF_SECTION *subcs;
1677                 const char *name2 = cf_section_name2(cs);
1678
1679                 for (subcs = cf_subsection_find_next(cs, NULL, "listen");
1680                      subcs != NULL;
1681                      subcs = cf_subsection_find_next(cs, subcs, "listen")) {
1682                         this = listen_parse(subcs, name2);
1683                         if (!this) {
1684                                 listen_free(head);
1685                                 return -1;
1686                         }
1687
1688 #ifdef WITH_PROXY
1689                         if (this->type == RAD_LISTEN_PROXY) {
1690                                 radlog(L_ERR, "Error: listen type \"proxy\" Cannot appear in a virtual server section");
1691                                 listen_free(head);
1692                                 return -1;
1693                         }
1694 #endif
1695
1696                         *last = this;
1697                         last = &(this->next);
1698                 } /* loop over "listen" directives in virtual servers */
1699         } /* loop over virtual servers */
1700
1701         /*
1702          *      If we're proxying requests, open the proxy FD.
1703          *      Otherwise, don't do anything.
1704          */
1705  do_proxy:
1706 #ifdef WITH_PROXY
1707         if (mainconfig.proxy_requests == TRUE) {
1708                 int             port = -1;
1709                 listen_socket_t *sock = NULL;
1710
1711                 /*
1712                  *      No sockets to receive packets, therefore
1713                  *      proxying is pointless.
1714                  */
1715                 if (!*head) return -1;
1716
1717                 if (defined_proxy) goto done;
1718
1719                 /*
1720                  *      Find the first authentication port,
1721                  *      and use it
1722                  */
1723                 for (this = *head; this != NULL; this = this->next) {
1724                         if (this->type == RAD_LISTEN_AUTH) {
1725                                 sock = this->data;
1726                                 if (server_ipaddr.af == AF_UNSPEC) {
1727                                         server_ipaddr = sock->ipaddr;
1728                                 }
1729                                 port = sock->port + 2; /* skip acct port */
1730                                 break;
1731                         }
1732                         if (this->type == RAD_LISTEN_VQP) {
1733                                 sock = this->data;
1734                                 if (server_ipaddr.af == AF_UNSPEC) {
1735                                         server_ipaddr = sock->ipaddr;
1736                                 }
1737                                 port = sock->port + 1;
1738                                 break;
1739                         }
1740                 }
1741
1742                 if (port < 0) port = 1024 + (fr_rand() & 0x1ff);
1743
1744                 /*
1745                  *      Address is still unspecified, use IPv4.
1746                  */
1747                 if (server_ipaddr.af == AF_UNSPEC) {
1748                         server_ipaddr.af = AF_INET;
1749                         server_ipaddr.ipaddr.ip4addr.s_addr = htonl(INADDR_ANY);
1750                 }
1751
1752                 this = listen_alloc(RAD_LISTEN_PROXY);
1753                 sock = this->data;
1754
1755                 /*
1756                  *      Create the first proxy socket.
1757                  */
1758                 sock->ipaddr = server_ipaddr;
1759
1760                 /*
1761                  *      Try to find a proxy port (value doesn't matter)
1762                  */
1763                 for (sock->port = port;
1764                      sock->port < 64000;
1765                      sock->port++) {
1766                         if (listen_bind(this) == 0) {
1767                                 *last = this;
1768                                 last = &(this->next); /* just in case */
1769                                 break;
1770                         }
1771                 }
1772
1773                 if (sock->port >= 64000) {
1774                         listen_free(head);
1775                         listen_free(&this);
1776                         radlog(L_ERR, "Failed to open socket for proxying");
1777                         return -1;
1778                 }
1779         }
1780
1781  done:                  /* used only in proxy code. */
1782 #endif
1783
1784         return 0;
1785 }
1786
1787 /*
1788  *      Free a linked list of listeners;
1789  */
1790 void listen_free(rad_listen_t **head)
1791 {
1792         rad_listen_t *this;
1793
1794         if (!head || !*head) return;
1795
1796         this = *head;
1797         while (this) {
1798                 rad_listen_t *next = this->next;
1799
1800                 /*
1801                  *      Other code may have eaten the FD.
1802                  */
1803                 if (this->fd >= 0) close(this->fd);
1804
1805                 if (master_listen[this->type].free) {
1806                         master_listen[this->type].free(this);
1807                 }
1808                 free(this->data);
1809                 free(this);
1810
1811                 this = next;
1812         }
1813
1814         *head = NULL;
1815 }
1816
1817 #ifdef WITH_STATS
1818 RADCLIENT_LIST *listener_find_client_list(const fr_ipaddr_t *ipaddr,
1819                                           int port)
1820 {
1821         rad_listen_t *this;
1822
1823         for (this = mainconfig.listen; this != NULL; this = this->next) {
1824                 listen_socket_t *sock;
1825
1826                 if ((this->type != RAD_LISTEN_AUTH) &&
1827                     (this->type != RAD_LISTEN_ACCT)) continue;
1828
1829                 sock = this->data;
1830
1831                 if ((sock->port == port) &&
1832                     (fr_ipaddr_cmp(ipaddr, &sock->ipaddr) == 0)) {
1833                         return sock->clients;
1834                 }
1835         }
1836
1837         return NULL;
1838 }
1839
1840 rad_listen_t *listener_find_byipaddr(const fr_ipaddr_t *ipaddr, int port)
1841 {
1842         rad_listen_t *this;
1843
1844         for (this = mainconfig.listen; this != NULL; this = this->next) {
1845                 listen_socket_t *sock;
1846
1847                 if ((this->type != RAD_LISTEN_AUTH) &&
1848                     (this->type != RAD_LISTEN_ACCT)) continue;
1849
1850                 sock = this->data;
1851
1852                 if ((sock->port == port) &&
1853                     (fr_ipaddr_cmp(ipaddr, &sock->ipaddr) == 0)) {
1854                         return this;
1855                 }
1856         }
1857
1858         return NULL;
1859 }
1860 #endif