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/radius_snmp.h>
  29 #include <freeradius-devel/modules.h>
  30 #include <freeradius-devel/rad_assert.h>
  31 #include <freeradius-devel/vqp.h>
  32 #include <freeradius-devel/dhcp.h>
  33
  34 #include <freeradius-devel/vmps.h>
  35 #include <freeradius-devel/detail.h>
  36
  37 #ifdef HAVE_SYS_RESOURCE_H
  38 #include <sys/resource.h>
  39 #endif
  40
  41 #ifdef HAVE_NET_IF_H
  42 #include <net/if.h>
  43 #endif
  44
  45 #ifdef HAVE_FCNTL_H
  46 #include <fcntl.h>
  47 #endif
  48
  49
  50 /*
  51  *      We'll use this below.
  52  */
  53 typedef int (*rad_listen_parse_t)(CONF_SECTION *, rad_listen_t *);
  54 typedef void (*rad_listen_free_t)(rad_listen_t *);
  55
  56 typedef struct rad_listen_master_t {
  57         rad_listen_parse_t      parse;
  58         rad_listen_free_t       free;
  59         rad_listen_recv_t       recv;
  60         rad_listen_send_t       send;
  61         rad_listen_print_t      print;
  62         rad_listen_encode_t     encode;
  63         rad_listen_decode_t     decode;
  64 } rad_listen_master_t;
  65
  66 typedef struct listen_socket_t {
  67         /*
  68          *      For normal sockets.
  69          */
  70         fr_ipaddr_t     ipaddr;
  71         int             port;
  72 #ifdef SO_BINDTODEVICE
  73         const char              *interface;
  74 #endif
  75         RADCLIENT_LIST  *clients;
  76 } listen_socket_t;
  77
  78 /*
  79  *      Find a per-socket client.
  80  */
  81 RADCLIENT *client_listener_find(const rad_listen_t *listener,
  82                                        const fr_ipaddr_t *ipaddr)
  83 {
  84 #ifdef WITH_DYNAMIC_CLIENTS
  85         int rcode;
  86         time_t now;
  87         listen_socket_t *sock;
  88         REQUEST *request;
  89         RADCLIENT *client, *created;
  90 #endif
  91         RADCLIENT_LIST *clients;
  92
  93         rad_assert(listener != NULL);
  94         rad_assert(ipaddr != NULL);
  95
  96         rad_assert((listener->type == RAD_LISTEN_AUTH) ||
  97                    (listener->type == RAD_LISTEN_ACCT) ||
  98                    (listener->type == RAD_LISTEN_VQP) ||
  99                    (listener->type == RAD_LISTEN_DHCP));
 100
 101         clients = ((listen_socket_t *)listener->data)->clients;
 102
 103         /*
 104          *      This HAS to have been initialized previously.
 105          */
 106         rad_assert(clients != NULL);
 107
 108 #ifdef WITH_DYNAMIC_CLIENTS
 109         client = client_find(clients, ipaddr);
 110         if (!client) return NULL;
 111
 112         /*
 113          *      No server defined, and it's not dynamic.  Return it.
 114          */
 115         if (!client->client_server && !client->dynamic) return client;
 116
 117         now = time(NULL);
 118
 119         /*
 120          *      It's a dynamically generated client, check it.
 121          */
 122         if (client->dynamic) {
 123                 /*
 124                  *      Lives forever.  Return it.
 125                  */
 126                 if (client->lifetime == 0) return client;
 127
 128                 /*
 129                  *      Rate-limit the deletion of known clients.
 130                  *      This makes them last a little longer, but
 131                  *      prevents the server from melting down if (say)
 132                  *      10k clients all expire at once.
 133                  */
 134                 if (now == client->last_new_client) return client;
 135
 136                 /*
 137                  *      It's not dead yet.  Return it.
 138                  */
 139                 if ((client->created + client->lifetime) > now) return client;
 140
 141                 /*
 142                  *      It's dead, Jim.  Delete it.
 143                  */
 144                 client_delete(clients, client);
 145
 146                 /*
 147                  *      Go find the enclosing network again.
 148                  */
 149                 client = client_find(clients, ipaddr);
 150
 151                 /*
 152                  *      WTF?
 153                  */
 154                 if (!client) return NULL;
 155                 if (!client->client_server) return NULL;
 156
 157                 /*
 158                  *      At this point, 'client' is the enclosing
 159                  *      network that configures where dynamic clients
 160                  *      can be defined.
 161                  */
 162                 rad_assert(client->dynamic == 0);
 163         } else {
 164                 /*
 165                  *      The IP is unknown, so we've found an enclosing
 166                  *      network.  Enable DoS protection.  We only
 167                  *      allow one new client per second.  Known
 168                  *      clients aren't subject to this restriction.
 169                  */
 170                 if (now == client->last_new_client) return NULL;
 171         }
 172
 173         client->last_new_client = now;
 174
 175         request = request_alloc();
 176         if (!request) return NULL;
 177
 178         request->listener = listener;
 179         request->client = client;
 180         request->packet = rad_alloc(0);
 181         if (!request->packet) {
 182                 request_free(&request);
 183                 return NULL;
 184         }
 185         request->reply = rad_alloc(0);
 186         if (!request->reply) {
 187                 request_free(&request);
 188                 return NULL;
 189         }
 190         request->packet->timestamp = request->timestamp;
 191         request->number = 0;
 192         request->priority = listener->type;
 193         request->server = client->client_server;
 194         request->root = &mainconfig;
 195
 196         /*
 197          *      Run a fake request through the given virtual server.
 198          *      Look for FreeRADIUS-Client-IP-Address
 199          *               FreeRADIUS-Client-Secret
 200          *              ...
 201          *
 202          *      and create the RADCLIENT structure from that.
 203          */
 204
 205         sock = listener->data;
 206         request->packet->sockfd = listener->fd;
 207         request->packet->src_ipaddr = *ipaddr;
 208         request->packet->src_port = 0; /* who cares... */
 209         request->packet->dst_ipaddr = sock->ipaddr;
 210         request->packet->dst_port = sock->port;
 211
 212         request->reply->sockfd = request->packet->sockfd;
 213         request->reply->dst_ipaddr = request->packet->src_ipaddr;
 214         request->reply->src_ipaddr = request->packet->dst_ipaddr;
 215         request->reply->dst_port = request->packet->src_port;
 216         request->reply->src_port = request->packet->dst_port;
 217         request->reply->id = request->packet->id;
 218         request->reply->code = 0; /* UNKNOWN code */
 219
 220
 221         DEBUG("server %s {", request->server);
 222
 223         rcode = module_authorize(0, request);
 224
 225         DEBUG("} # server %s", request->server);
 226
 227         if (rcode != RLM_MODULE_OK) {
 228                 request_free(&request);
 229                 return NULL;
 230         }
 231
 232         created = client_create(clients, request);
 233
 234         request_free(&request);
 235
 236         return created;         /* may be NULL */
 237 #else
 238         return client_find(clients, ipaddr);
 239 #endif
 240 }
 241
 242 static int listen_bind(rad_listen_t *this);
 243
 244
 245 /*
 246  *      Process and reply to a server-status request.
 247  *      Like rad_authenticate and rad_accounting this should
 248  *      live in it's own file but it's so small we don't bother.
 249  */
 250 static int rad_status_server(REQUEST *request)
 251 {
 252         int rcode = RLM_MODULE_OK;
 253         DICT_VALUE *dval;
 254
 255         switch (request->listener->type) {
 256         case RAD_LISTEN_AUTH:
 257                 dval = dict_valbyname(PW_AUTZ_TYPE, "Status-Server");
 258                 if (dval) {
 259                         rcode = module_authorize(dval->value, request);
 260                 } else {
 261                         rcode = RLM_MODULE_OK;
 262                 }
 263
 264                 switch (rcode) {
 265                 case RLM_MODULE_OK:
 266                 case RLM_MODULE_UPDATED:
 267                         request->reply->code = PW_AUTHENTICATION_ACK;
 268                         break;
 269
 270                 case RLM_MODULE_FAIL:
 271                 case RLM_MODULE_HANDLED:
 272                         request->reply->code = 0; /* don't reply */
 273                         break;
 274
 275                 default:
 276                 case RLM_MODULE_REJECT:
 277                         request->reply->code = PW_AUTHENTICATION_REJECT;
 278                         break;
 279                 }
 280                 break;
 281
 282 #ifdef WITH_ACCOUNTING
 283         case RAD_LISTEN_ACCT:
 284                 dval = dict_valbyname(PW_ACCT_TYPE, "Status-Server");
 285                 if (dval) {
 286                         rcode = module_accounting(dval->value, request);
 287                 } else {
 288                         rcode = RLM_MODULE_OK;
 289                 }
 290
 291                 switch (rcode) {
 292                 case RLM_MODULE_OK:
 293                 case RLM_MODULE_UPDATED:
 294                         request->reply->code = PW_ACCOUNTING_RESPONSE;
 295                         break;
 296
 297                 default:
 298                         request->reply->code = 0; /* don't reply */
 299                         break;
 300                 }
 301                 break;
 302 #endif
 303
 304         default:
 305                 return 0;
 306         }
 307
 308 #ifdef WITH_STATS
 309         request_stats_reply(request);
 310 #endif
 311
 312         return 0;
 313 }
 314
 315
 316 static int socket_print(rad_listen_t *this, char *buffer, size_t bufsize)
 317 {
 318         size_t len;
 319         listen_socket_t *sock = this->data;
 320         const char *name;
 321
 322         switch (this->type) {
 323         case RAD_LISTEN_AUTH:
 324                 name = "authentication";
 325                 break;
 326
 327 #ifdef WITH_ACCOUNTING
 328         case RAD_LISTEN_ACCT:
 329                 name = "accounting";
 330                 break;
 331 #endif
 332
 333 #ifdef WITH_PROXY
 334         case RAD_LISTEN_PROXY:
 335                 name = "proxy";
 336                 break;
 337 #endif
 338
 339 #ifdef WITH_VMPS
 340         case RAD_LISTEN_VQP:
 341                 name = "vmps";
 342                 break;
 343 #endif
 344
 345 #ifdef WITH_DHCP
 346         case RAD_LISTEN_DHCP:
 347                 name = "dhcp";
 348                 break;
 349 #endif
 350
 351         default:
 352                 name = "??";
 353                 break;
 354         }
 355
 356 #define FORWARD len = strlen(buffer); if (len >= (bufsize + 1)) return 0;buffer += len;bufsize -= len
 357 #define ADDSTRING(_x) strlcpy(buffer, _x, bufsize);FORWARD
 358
 359         ADDSTRING(name);
 360
 361 #ifdef SO_BINDTODEVICE
 362         if (sock->interface) {
 363                 ADDSTRING(" interface ");
 364                 ADDSTRING(sock->interface);
 365         }
 366 #endif
 367
 368         ADDSTRING(" address ");
 369
 370         if ((sock->ipaddr.af == AF_INET) &&
 371             (sock->ipaddr.ipaddr.ip4addr.s_addr == htonl(INADDR_ANY))) {
 372                 strlcpy(buffer, "*", bufsize);
 373         } else {
 374                 ip_ntoh(&sock->ipaddr, buffer, bufsize);
 375         }
 376         FORWARD;
 377
 378         ADDSTRING(" port ");
 379         snprintf(buffer, bufsize, "%d", sock->port);
 380         FORWARD;
 381
 382         if (this->server) {
 383                 ADDSTRING(" as server ");
 384                 ADDSTRING(this->server);
 385         }
 386
 387 #undef ADDSTRING
 388 #undef FORWARD
 389
 390         return 1;
 391 }
 392
 393
 394 /*
 395  *      Parse an authentication or accounting socket.
 396  */
 397 static int common_socket_parse(CONF_SECTION *cs, rad_listen_t *this)
 398 {
 399         int             rcode;
 400         int             listen_port;
 401         fr_ipaddr_t     ipaddr;
 402         listen_socket_t *sock = this->data;
 403         char            *section_name = NULL;
 404         CONF_SECTION    *client_cs, *parentcs;
 405
 406         /*
 407          *      Try IPv4 first
 408          */
 409         ipaddr.ipaddr.ip4addr.s_addr = htonl(INADDR_NONE);
 410         rcode = cf_item_parse(cs, "ipaddr", PW_TYPE_IPADDR,
 411                               &ipaddr.ipaddr.ip4addr, NULL);
 412         if (rcode < 0) return -1;
 413
 414         if (rcode == 0) { /* successfully parsed IPv4 */
 415                 ipaddr.af = AF_INET;
 416
 417         } else {        /* maybe IPv6? */
 418                 rcode = cf_item_parse(cs, "ipv6addr", PW_TYPE_IPV6ADDR,
 419                                       &ipaddr.ipaddr.ip6addr, NULL);
 420                 if (rcode < 0) return -1;
 421
 422                 if (rcode == 1) {
 423                         cf_log_err(cf_sectiontoitem(cs),
 424                                    "No address specified in listen section");
 425                         return -1;
 426                 }
 427                 ipaddr.af = AF_INET6;
 428         }
 429
 430         rcode = cf_item_parse(cs, "port", PW_TYPE_INTEGER,
 431                               &listen_port, "0");
 432         if (rcode < 0) return -1;
 433
 434         if ((listen_port < 0) || (listen_port > 65500)) {
 435                         cf_log_err(cf_sectiontoitem(cs),
 436                                    "Invalid value for \"port\"");
 437                         return -1;
 438         }
 439
 440         sock->ipaddr = ipaddr;
 441         sock->port = listen_port;
 442
 443         /*
 444          *      If we can bind to interfaces, do so,
 445          *      else don't.
 446          */
 447         if (cf_pair_find(cs, "interface")) {
 448 #ifndef SO_BINDTODEVICE
 449                 cf_log_err(cf_sectiontoitem(cs),
 450                            "System does not support binding to interfaces.  Delete this line from the configuration file.");
 451                 return -1;
 452 #else
 453                 const char *value;
 454                 CONF_PAIR *cp = cf_pair_find(cs, "interface");
 455
 456                 rad_assert(cp != NULL);
 457                 value = cf_pair_value(cp);
 458                 if (!value) {
 459                         cf_log_err(cf_sectiontoitem(cs),
 460                                    "No interface name given");
 461                         return -1;
 462                 }
 463                 sock->interface = value;
 464 #endif
 465         }
 466
 467         /*
 468          *      And bind it to the port.
 469          */
 470         if (listen_bind(this) < 0) {
 471                 char buffer[128];
 472                 cf_log_err(cf_sectiontoitem(cs),
 473                            "Error binding to port for %s port %d",
 474                            ip_ntoh(&sock->ipaddr, buffer, sizeof(buffer)),
 475                            sock->port);
 476                 return -1;
 477         }
 478
 479 #ifdef WITH_PROXY
 480         /*
 481          *      Proxy sockets don't have clients.
 482          */
 483         if (this->type == RAD_LISTEN_PROXY) return 0;
 484 #endif
 485
 486         /*
 487          *      The more specific configurations are preferred to more
 488          *      generic ones.
 489          */
 490         client_cs = NULL;
 491         parentcs = cf_top_section(cs);
 492         rcode = cf_item_parse(cs, "clients", PW_TYPE_STRING_PTR,
 493                               &section_name, NULL);
 494         if (rcode < 0) return -1; /* bad string */
 495         if (rcode == 0) {
 496                 /*
 497                  *      Explicit list given: use it.
 498                  */
 499                 client_cs = cf_section_sub_find_name2(parentcs,
 500                                                       "clients",
 501                                                       section_name);
 502                 if (!client_cs) {
 503                         client_cs = cf_section_find(section_name);
 504                 }
 505                 if (!client_cs) {
 506                         cf_log_err(cf_sectiontoitem(cs),
 507                                    "Failed to find clients %s {...}",
 508                                    section_name);
 509                         free(section_name);
 510                         return -1;
 511                 }
 512                 free(section_name);
 513         } /* else there was no "clients = " entry. */
 514
 515         if (!client_cs) {
 516                 CONF_SECTION *server_cs;
 517
 518                 server_cs = cf_section_sub_find_name2(parentcs,
 519                                                       "server",
 520                                                       this->server);
 521                 /*
 522                  *      Found a "server foo" section.  If there are clients
 523                  *      in it, use them.
 524                  */
 525                 if (server_cs &&
 526                     (cf_section_sub_find(server_cs, "client") != NULL)) {
 527                         client_cs = server_cs;
 528                 }
 529         }
 530
 531         /*
 532          *      Still nothing.  Look for global clients.
 533          */
 534         if (!client_cs) client_cs = parentcs;
 535
 536         sock->clients = clients_parse_section(client_cs);
 537         if (!sock->clients) {
 538                 cf_log_err(cf_sectiontoitem(cs),
 539                            "Failed to find any clients for this listen section");
 540                 return -1;
 541         }
 542
 543         return 0;
 544 }
 545
 546 /*
 547  *      Send an authentication response packet
 548  */
 549 static int auth_socket_send(rad_listen_t *listener, REQUEST *request)
 550 {
 551         rad_assert(request->listener == listener);
 552         rad_assert(listener->send == auth_socket_send);
 553
 554         return rad_send(request->reply, request->packet,
 555                         request->client->secret);
 556 }
 557
 558
 559 #ifdef WITH_ACCOUNTING
 560 /*
 561  *      Send an accounting response packet (or not)
 562  */
 563 static int acct_socket_send(rad_listen_t *listener, REQUEST *request)
 564 {
 565         rad_assert(request->listener == listener);
 566         rad_assert(listener->send == acct_socket_send);
 567
 568         /*
 569          *      Accounting reject's are silently dropped.
 570          *
 571          *      We do it here to avoid polluting the rest of the
 572          *      code with this knowledge
 573          */
 574         if (request->reply->code == 0) return 0;
 575
 576         return rad_send(request->reply, request->packet,
 577                         request->client->secret);
 578 }
 579 #endif
 580
 581 #ifdef WITH_PROXY
 582 /*
 583  *      Send a packet to a home server.
 584  *
 585  *      FIXME: have different code for proxy auth & acct!
 586  */
 587 static int proxy_socket_send(rad_listen_t *listener, REQUEST *request)
 588 {
 589         listen_socket_t *sock = listener->data;
 590
 591         rad_assert(request->proxy_listener == listener);
 592         rad_assert(listener->send == proxy_socket_send);
 593
 594         request->proxy->src_ipaddr = sock->ipaddr;
 595         request->proxy->src_port = sock->port;
 596
 597         return rad_send(request->proxy, request->packet,
 598                         request->home_server->secret);
 599 }
 600 #endif
 601
 602
 603 /*
 604  *      Check if an incoming request is "ok"
 605  *
 606  *      It takes packets, not requests.  It sees if the packet looks
 607  *      OK.  If so, it does a number of sanity checks on it.
 608   */
 609 static int auth_socket_recv(rad_listen_t *listener,
 610                             RAD_REQUEST_FUNP *pfun, REQUEST **prequest)
 611 {
 612         ssize_t         rcode;
 613         int             code, src_port;
 614         RADIUS_PACKET   *packet;
 615         RAD_REQUEST_FUNP fun = NULL;
 616         char            buffer[128];
 617         RADCLIENT       *client;
 618         fr_ipaddr_t     src_ipaddr;
 619
 620         rcode = rad_recv_header(listener->fd, &src_ipaddr, &src_port, &code);
 621         if (rcode < 0) return 0;
 622
 623         RAD_STATS_TYPE_INC(listener, total_requests);
 624
 625         if (rcode < 20) {       /* AUTH_HDR_LEN */
 626                 RAD_STATS_TYPE_INC(listener, total_malformed_requests);
 627                 return 0;
 628         }
 629
 630         if ((client = client_listener_find(listener,
 631                                            &src_ipaddr)) == NULL) {
 632                 rad_recv_discard(listener->fd);
 633                 RAD_STATS_TYPE_INC(listener, total_invalid_requests);
 634
 635                 if (debug_flag > 0) {
 636                         char name[1024];
 637
 638                         listener->print(listener, name, sizeof(name));
 639
 640                         /*
 641                          *      This is debugging rather than logging, so that
 642                          *      DoS attacks don't affect us.
 643                          */
 644                         DEBUG("Ignoring request to %s from unknown client %s port %d",
 645                               name,
 646                               inet_ntop(src_ipaddr.af, &src_ipaddr.ipaddr,
 647                                         buffer, sizeof(buffer)), src_port);
 648                 }
 649
 650                 return 0;
 651         }
 652
 653         /*
 654          *      Some sanity checks, based on the packet code.
 655          */
 656         switch(code) {
 657         case PW_AUTHENTICATION_REQUEST:
 658                 RAD_STATS_CLIENT_INC(listener, client, requests);
 659                 fun = rad_authenticate;
 660                 break;
 661
 662         case PW_STATUS_SERVER:
 663                 if (!mainconfig.status_server) {
 664                         rad_recv_discard(listener->fd);
 665                         RAD_STATS_TYPE_INC(listener, total_packets_dropped);
 666                         RAD_STATS_CLIENT_INC(listener, client, packets_dropped);
 667                         DEBUG("WARNING: Ignoring Status-Server request due to security configuration");
 668                         return 0;
 669                 }
 670                 fun = rad_status_server;
 671                 break;
 672
 673         default:
 674                 rad_recv_discard(listener->fd);
 675                 RAD_STATS_INC(radius_auth_stats.total_unknown_types);
 676                 RAD_STATS_CLIENT_INC(listener, client, unknown_types);
 677
 678                 DEBUG("Invalid packet code %d sent to authentication port from client %s port %d : IGNORED",
 679                       code, client->shortname, src_port);
 680                 return 0;
 681                 break;
 682         } /* switch over packet types */
 683
 684         /*
 685          *      Now that we've sanity checked everything, receive the
 686          *      packet.
 687          */
 688         packet = rad_recv(listener->fd, client->message_authenticator);
 689         if (!packet) {
 690                 RAD_STATS_TYPE_INC(listener, total_malformed_requests);
 691                 DEBUG("%s", librad_errstr);
 692                 return 0;
 693         }
 694
 695         if (!received_request(listener, packet, prequest, client)) {
 696                 RAD_STATS_TYPE_INC(listener, total_packets_dropped);
 697                 RAD_STATS_CLIENT_INC(listener, client, packets_dropped);
 698                 rad_free(&packet);
 699                 return 0;
 700         }
 701
 702         *pfun = fun;
 703         return 1;
 704 }
 705
 706
 707 #ifdef WITH_ACCOUNTING
 708 /*
 709  *      Receive packets from an accounting socket
 710  */
 711 static int acct_socket_recv(rad_listen_t *listener,
 712                             RAD_REQUEST_FUNP *pfun, REQUEST **prequest)
 713 {
 714         ssize_t         rcode;
 715         int             code, src_port;
 716         RADIUS_PACKET   *packet;
 717         RAD_REQUEST_FUNP fun = NULL;
 718         char            buffer[128];
 719         RADCLIENT       *client;
 720         fr_ipaddr_t     src_ipaddr;
 721
 722         rcode = rad_recv_header(listener->fd, &src_ipaddr, &src_port, &code);
 723         if (rcode < 0) return 0;
 724
 725         RAD_STATS_TYPE_INC(listener, total_requests);
 726
 727         if (rcode < 20) {       /* AUTH_HDR_LEN */
 728                 RAD_STATS_TYPE_INC(listener, total_malformed_requests);
 729                 return 0;
 730         }
 731
 732         if ((client = client_listener_find(listener,
 733                                            &src_ipaddr)) == NULL) {
 734                 rad_recv_discard(listener->fd);
 735                 RAD_STATS_TYPE_INC(listener, total_invalid_requests);
 736
 737                 /*
 738                  *      This is debugging rather than logging, so that
 739                  *      DoS attacks don't affect us.
 740                  */
 741                 if (debug_flag > 0) {
 742                         char name[1024];
 743
 744                         listener->print(listener, name, sizeof(name));
 745
 746                         DEBUG("Ignoring request to %s from unknown client %s port %d",
 747                               name,
 748                               inet_ntop(src_ipaddr.af, &src_ipaddr.ipaddr,
 749                                         buffer, sizeof(buffer)), src_port);
 750                 }
 751
 752                 return 0;
 753         }
 754
 755         /*
 756          *      Some sanity checks, based on the packet code.
 757          */
 758         switch(code) {
 759         case PW_ACCOUNTING_REQUEST:
 760                 RAD_STATS_CLIENT_INC(listener, client, requests);
 761                 fun = rad_accounting;
 762                 break;
 763
 764         case PW_STATUS_SERVER:
 765                 if (!mainconfig.status_server) {
 766                         rad_recv_discard(listener->fd);
 767                         RAD_STATS_TYPE_INC(listener, total_packets_dropped);
 768                         RAD_STATS_CLIENT_INC(listener, client, unknown_types);
 769
 770                         DEBUG("WARNING: Ignoring Status-Server request due to security configuration");
 771                         return 0;
 772                 }
 773                 fun = rad_status_server;
 774                 break;
 775
 776         default:
 777                 rad_recv_discard(listener->fd);
 778                 RAD_STATS_TYPE_INC(listener, total_unknown_types);
 779                 RAD_STATS_CLIENT_INC(listener, client, unknown_types);
 780
 781                 DEBUG("Invalid packet code %d sent to a accounting port from client %s port %d : IGNORED",
 782                       code, client->shortname, src_port);
 783                 return 0;
 784         } /* switch over packet types */
 785
 786         /*
 787          *      Now that we've sanity checked everything, receive the
 788          *      packet.
 789          */
 790         packet = rad_recv(listener->fd, 0);
 791         if (!packet) {
 792                 RAD_STATS_TYPE_INC(listener, total_malformed_requests);
 793                 radlog(L_ERR, "%s", librad_errstr);
 794                 return 0;
 795         }
 796
 797         /*
 798          *      There can be no duplicate accounting packets.
 799          */
 800         if (!received_request(listener, packet, prequest, client)) {
 801                 RAD_STATS_TYPE_INC(listener, total_packets_dropped);
 802                 RAD_STATS_CLIENT_INC(listener, client, packets_dropped);
 803                 rad_free(&packet);
 804                 return 0;
 805         }
 806
 807         *pfun = fun;
 808         return 1;
 809 }
 810 #endif
 811
 812 #ifdef WITH_PROXY
 813 /*
 814  *      Recieve packets from a proxy socket.
 815  */
 816 static int proxy_socket_recv(rad_listen_t *listener,
 817                               RAD_REQUEST_FUNP *pfun, REQUEST **prequest)
 818 {
 819         REQUEST         *request;
 820         RADIUS_PACKET   *packet;
 821         RAD_REQUEST_FUNP fun = NULL;
 822         char            buffer[128];
 823
 824         packet = rad_recv(listener->fd, 0);
 825         if (!packet) {
 826                 radlog(L_ERR, "%s", librad_errstr);
 827                 return 0;
 828         }
 829
 830         /*
 831          *      FIXME: Client MIB updates?
 832          */
 833         switch(packet->code) {
 834         case PW_AUTHENTICATION_ACK:
 835         case PW_ACCESS_CHALLENGE:
 836         case PW_AUTHENTICATION_REJECT:
 837                 fun = rad_authenticate;
 838                 break;
 839
 840 #ifdef WITH_ACCOUNTING
 841         case PW_ACCOUNTING_RESPONSE:
 842                 fun = rad_accounting;
 843                 break;
 844 #endif
 845
 846         default:
 847                 /*
 848                  *      FIXME: Update MIB for packet types?
 849                  */
 850                 radlog(L_ERR, "Invalid packet code %d sent to a proxy port "
 851                        "from home server %s port %d - ID %d : IGNORED",
 852                        packet->code,
 853                        ip_ntoh(&packet->src_ipaddr, buffer, sizeof(buffer)),
 854                        packet->src_port, packet->id);
 855                 rad_free(&packet);
 856                 return 0;
 857         }
 858
 859         request = received_proxy_response(packet);
 860         if (!request) {
 861                 return 0;
 862         }
 863
 864         rad_assert(fun != NULL);
 865         *pfun = fun;
 866         *prequest = request;
 867
 868         return 1;
 869 }
 870 #endif
 871
 872
 873 static int client_socket_encode(UNUSED rad_listen_t *listener, REQUEST *request)
 874 {
 875         if (!request->reply->code) return 0;
 876
 877         rad_encode(request->reply, request->packet,
 878                    request->client->secret);
 879         rad_sign(request->reply, request->packet,
 880                  request->client->secret);
 881
 882         return 0;
 883 }
 884
 885
 886 static int client_socket_decode(UNUSED rad_listen_t *listener, REQUEST *request)
 887 {
 888         if (rad_verify(request->packet, NULL,
 889                        request->client->secret) < 0) {
 890                 return -1;
 891         }
 892
 893         return rad_decode(request->packet, NULL,
 894                           request->client->secret);
 895 }
 896
 897 #ifdef WITH_PROXY
 898 static int proxy_socket_encode(UNUSED rad_listen_t *listener, REQUEST *request)
 899 {
 900         rad_encode(request->proxy, NULL, request->home_server->secret);
 901         rad_sign(request->proxy, NULL, request->home_server->secret);
 902
 903         return 0;
 904 }
 905
 906
 907 static int proxy_socket_decode(UNUSED rad_listen_t *listener, REQUEST *request)
 908 {
 909         if (rad_verify(request->proxy_reply, request->proxy,
 910                        request->home_server->secret) < 0) {
 911                 return -1;
 912         }
 913
 914         return rad_decode(request->proxy_reply, request->proxy,
 915                            request->home_server->secret);
 916 }
 917 #endif
 918
 919 #ifdef WITH_SNMP
 920 static int radius_snmp_recv(rad_listen_t *listener,
 921                             UNUSED RAD_REQUEST_FUNP *pfun,
 922                             UNUSED REQUEST **prequest)
 923 {
 924         if ((rad_snmp.smux_fd >= 0) &&
 925             (rad_snmp.smux_event == SMUX_READ)) {
 926                 smux_read();
 927         }
 928
 929         /*
 930          *  If we've got to re-connect, then do so now,
 931          *  before calling select again.
 932          */
 933         if (rad_snmp.smux_event == SMUX_CONNECT) {
 934                 smux_connect();
 935         }
 936
 937         /*
 938          *      Reset this every time, as the smux connect may have
 939          *      opened a new socket.
 940          */
 941         listener->fd = rad_snmp.smux_fd;
 942
 943         return 0;
 944 }
 945
 946
 947 static int radius_snmp_print(UNUSED rad_listen_t *this, char *buffer, size_t bufsize)
 948 {
 949         return snprintf(buffer, bufsize, "SMUX with OID .1.3.6.1.4.1.11344.1.1.1");
 950 }
 951
 952 #endif
 953
 954 #include "dhcpd.c"
 955
 956 static const rad_listen_master_t master_listen[RAD_LISTEN_MAX] = {
 957         { NULL, NULL, NULL, NULL, NULL, NULL, NULL},    /* RAD_LISTEN_NONE */
 958
 959 #ifdef WITH_PROXY
 960         /* proxying */
 961         { common_socket_parse, NULL,
 962           proxy_socket_recv, proxy_socket_send,
 963           socket_print, proxy_socket_encode, proxy_socket_decode },
 964 #else
 965         { NULL, NULL, NULL, NULL, NULL, NULL, NULL},
 966 #endif
 967
 968         /* authentication */
 969         { common_socket_parse, NULL,
 970           auth_socket_recv, auth_socket_send,
 971           socket_print, client_socket_encode, client_socket_decode },
 972
 973 #ifdef WITH_ACCOUNTING
 974         /* accounting */
 975         { common_socket_parse, NULL,
 976           acct_socket_recv, acct_socket_send,
 977           socket_print, client_socket_encode, client_socket_decode},
 978 #else
 979         { NULL, NULL, NULL, NULL, NULL, NULL, NULL},
 980 #endif
 981
 982 #ifdef WITH_DETAIL
 983         /* detail */
 984         { detail_parse, detail_free,
 985           detail_recv, detail_send,
 986           detail_print, detail_encode, detail_decode },
 987 #else
 988         { NULL, NULL, NULL, NULL, NULL, NULL, NULL},
 989 #endif
 990
 991 #ifdef WITH_VMPS
 992         /* vlan query protocol */
 993         { common_socket_parse, NULL,
 994           vqp_socket_recv, vqp_socket_send,
 995           socket_print, vqp_socket_encode, vqp_socket_decode },
 996 #else
 997         { NULL, NULL, NULL, NULL, NULL, NULL, NULL},
 998 #endif
 999
1000 #ifdef WITH_DHCP
1001         /* dhcp query protocol */
1002         { dhcp_socket_parse, NULL,
1003           dhcp_socket_recv, dhcp_socket_send,
1004           socket_print, dhcp_socket_encode, dhcp_socket_decode },
1005 #else
1006         { NULL, NULL, NULL, NULL, NULL, NULL, NULL},
1007 #endif
1008
1009         { NULL, NULL, NULL, NULL, NULL, NULL, NULL}     /* RAD_LISTEN_SNMP */
1010 };
1011
1012
1013
1014 /*
1015  *      Binds a listener to a socket.
1016  */
1017 static int listen_bind(rad_listen_t *this)
1018 {
1019         struct sockaddr_storage salocal;
1020         socklen_t       salen;
1021         listen_socket_t *sock = this->data;
1022
1023         /*
1024          *      If the port is zero, then it means the appropriate
1025          *      thing from /etc/services.
1026          */
1027         if (sock->port == 0) {
1028                 struct servent  *svp;
1029
1030                 switch (this->type) {
1031                 case RAD_LISTEN_AUTH:
1032                         svp = getservbyname ("radius", "udp");
1033                         if (svp != NULL) {
1034                                 sock->port = ntohs(svp->s_port);
1035                         } else {
1036                                 sock->port = PW_AUTH_UDP_PORT;
1037                         }
1038                         break;
1039
1040 #ifdef WITH_ACCOUNTING
1041                 case RAD_LISTEN_ACCT:
1042                         svp = getservbyname ("radacct", "udp");
1043                         if (svp != NULL) {
1044                                 sock->port = ntohs(svp->s_port);
1045                         } else {
1046                                 sock->port = PW_ACCT_UDP_PORT;
1047                         }
1048                         break;
1049 #endif
1050
1051 #ifdef WITH_PROXY
1052                 case RAD_LISTEN_PROXY:
1053                         sock->port = 0;
1054                         break;
1055 #endif
1056
1057 #ifdef WITH_VMPS
1058                 case RAD_LISTEN_VQP:
1059                         sock->port = 1589;
1060                         break;
1061 #endif
1062
1063                 default:
1064                         radlog(L_ERR, "ERROR: Non-fatal internal sanity check failed in bind.");
1065                         return -1;
1066                 }
1067         }
1068
1069         /*
1070          *      Copy fr_socket() here, as we may need to bind to a device.
1071          */
1072         this->fd = socket(sock->ipaddr.af, SOCK_DGRAM, 0);
1073         if (this->fd < 0) {
1074                 radlog(L_ERR, "Failed opening socket: %s", strerror(errno));
1075                 return -1;
1076         }
1077
1078 #ifdef SO_BINDTODEVICE
1079         /*
1080          *      Bind to a device BEFORE touching IP addresses.
1081          */
1082         if (sock->interface) {
1083                 struct ifreq ifreq;
1084                 strcpy(ifreq.ifr_name, sock->interface);
1085
1086                 if (setsockopt(this->fd, SOL_SOCKET, SO_BINDTODEVICE,
1087                                (char *)&ifreq, sizeof(ifreq)) < 0) {
1088                         close(this->fd);
1089                         radlog(L_ERR, "Failed opening to interface %s: %s",
1090                                sock->interface, strerror(errno));
1091                         return -1;
1092                 } /* else it worked. */
1093         }
1094 #endif
1095
1096 #ifdef WITH_UDPFROMTO
1097         /*
1098          *      Initialize udpfromto for all sockets.
1099          */
1100         if (udpfromto_init(this->fd) != 0) {
1101                 close(this->fd);
1102                 return -1;
1103         }
1104 #endif
1105
1106         /*
1107          *      Set up sockaddr stuff.
1108          */
1109         if (!fr_ipaddr2sockaddr(&sock->ipaddr, sock->port, &salocal, &salen)) {
1110                 close(this->fd);
1111                 return -1;
1112         }
1113
1114 #ifdef HAVE_STRUCT_SOCKADDR_IN6
1115         if (sock->ipaddr.af == AF_INET6) {
1116                 /*
1117                  *      Listening on '::' does NOT get you IPv4 to
1118                  *      IPv6 mapping.  You've got to listen on an IPv4
1119                  *      address, too.  This makes the rest of the server
1120                  *      design a little simpler.
1121                  */
1122 #ifdef IPV6_V6ONLY
1123
1124                 if (IN6_IS_ADDR_UNSPECIFIED(&sock->ipaddr.ipaddr.ip6addr)) {
1125                         int on = 1;
1126
1127                         setsockopt(this->fd, IPPROTO_IPV6, IPV6_V6ONLY,
1128                                    (char *)&on, sizeof(on));
1129                 }
1130 #endif /* IPV6_V6ONLY */
1131 #endif /* HAVE_STRUCT_SOCKADDR_IN6 */
1132         }
1133
1134         if (bind(this->fd, (struct sockaddr *) &salocal, salen) < 0) {
1135                 close(this->fd);
1136                 radlog(L_ERR, "Failed binding to socket: %s\n",
1137                        strerror(errno));
1138                 return -1;
1139         }
1140
1141         /*
1142          *      FreeBSD jail issues.  We bind to 0.0.0.0, but the
1143          *      kernel instead binds us to a 1.2.3.4.  If this
1144          *      happens, notice, and remember our real IP.
1145          */
1146         {
1147                 struct sockaddr_storage src;
1148                 socklen_t               sizeof_src = sizeof(src);
1149
1150                 memset(&src, 0, sizeof_src);
1151                 if (getsockname(this->fd, (struct sockaddr *) &src,
1152                                 &sizeof_src) < 0) {
1153                         radlog(L_ERR, "Failed getting socket name: %s",
1154                                strerror(errno));
1155                         return -1;
1156                 }
1157
1158                 if (!fr_sockaddr2ipaddr(&src, sizeof_src,
1159                                         &sock->ipaddr, &sock->port)) {
1160                         radlog(L_ERR, "Socket has unsupported address family");
1161                         return -1;
1162                 }
1163         }
1164
1165 #ifdef O_NONBLOCK
1166         {
1167                 int flags;
1168
1169                 if ((flags = fcntl(this->fd, F_GETFL, NULL)) < 0)  {
1170                         radlog(L_ERR, "Failure getting socket flags: %s)\n",
1171                                strerror(errno));
1172                         return -1;
1173                 }
1174
1175                 flags |= O_NONBLOCK;
1176                 if( fcntl(this->fd, F_SETFL, flags) < 0) {
1177                         radlog(L_ERR, "Failure setting socket flags: %s)\n",
1178                                strerror(errno));
1179                         return -1;
1180                 }
1181         }
1182 #endif
1183
1184         return 0;
1185 }
1186
1187
1188 /*
1189  *      Allocate & initialize a new listener.
1190  */
1191 static rad_listen_t *listen_alloc(RAD_LISTEN_TYPE type)
1192 {
1193         rad_listen_t *this;
1194
1195         this = rad_malloc(sizeof(*this));
1196         memset(this, 0, sizeof(*this));
1197
1198         this->type = type;
1199         this->recv = master_listen[this->type].recv;
1200         this->send = master_listen[this->type].send;
1201         this->print = master_listen[this->type].print;
1202         this->encode = master_listen[this->type].encode;
1203         this->decode = master_listen[this->type].decode;
1204
1205         switch (type) {
1206         case RAD_LISTEN_AUTH:
1207         case RAD_LISTEN_ACCT:
1208         case RAD_LISTEN_PROXY:
1209         case RAD_LISTEN_VQP:
1210         case RAD_LISTEN_DHCP:
1211                 this->data = rad_malloc(sizeof(listen_socket_t));
1212                 memset(this->data, 0, sizeof(listen_socket_t));
1213                 break;
1214
1215 #ifdef WITH_DETAIL
1216         case RAD_LISTEN_DETAIL:
1217                 this->data = NULL;
1218                 break;
1219 #endif
1220
1221         default:
1222                 rad_assert("Unsupported option!" == NULL);
1223                 break;
1224         }
1225
1226         return this;
1227 }
1228
1229
1230 #ifdef WITH_PROXY
1231 /*
1232  *      Externally visible function for creating a new proxy LISTENER.
1233  *
1234  *      For now, don't take ipaddr or port.
1235  *
1236  *      Not thread-safe, but all calls to it are protected by the
1237  *      proxy mutex in request_list.c
1238  */
1239 rad_listen_t *proxy_new_listener()
1240 {
1241         int last_proxy_port, port;
1242         rad_listen_t *this, *tmp, **last;
1243         listen_socket_t *sock, *old;
1244
1245         this = listen_alloc(RAD_LISTEN_PROXY);
1246
1247         /*
1248          *      Find an existing proxy socket to copy.
1249          *
1250          *      FIXME: Make it per-realm, or per-home server!
1251          */
1252         last_proxy_port = 0;
1253         old = NULL;
1254         last = &mainconfig.listen;
1255         for (tmp = mainconfig.listen; tmp != NULL; tmp = tmp->next) {
1256                 if (tmp->type == RAD_LISTEN_PROXY) {
1257                         sock = tmp->data;
1258                         if (sock->port > last_proxy_port) {
1259                                 last_proxy_port = sock->port + 1;
1260                         }
1261                         if (!old) old = sock;
1262                 }
1263
1264                 last = &(tmp->next);
1265         }
1266
1267         if (!old) {
1268                 listen_free(&this);
1269                 return NULL;    /* This is a serious error. */
1270         }
1271
1272         /*
1273          *      FIXME: find a new IP address to listen on?
1274          *
1275          *      This could likely be done in the "home server"
1276          *      configuration, to have per-home-server source IP's.
1277          */
1278         sock = this->data;
1279         memcpy(&sock->ipaddr, &old->ipaddr, sizeof(sock->ipaddr));
1280
1281         /*
1282          *      Keep going until we find an unused port.
1283          */
1284         for (port = last_proxy_port; port < 64000; port++) {
1285                 sock->port = port;
1286                 if (listen_bind(this) == 0) {
1287                         /*
1288                          *      Add the new listener to the list of
1289                          *      listeners.
1290                          */
1291                         *last = this;
1292                         return this;
1293                 }
1294         }
1295
1296         listen_free(&this);
1297         return NULL;
1298 }
1299 #endif
1300
1301 static const FR_NAME_NUMBER listen_compare[] = {
1302         { "auth",       RAD_LISTEN_AUTH },
1303 #ifdef WITH_ACCOUNTING
1304         { "acct",       RAD_LISTEN_ACCT },
1305 #endif
1306 #ifdef WITH_DETAIL
1307         { "detail",     RAD_LISTEN_DETAIL },
1308 #endif
1309 #ifdef WITH_PROXY
1310         { "proxy",      RAD_LISTEN_PROXY },
1311 #endif
1312 #ifdef WITH_VMPS
1313         { "vmps",       RAD_LISTEN_VQP },
1314 #endif
1315 #ifdef WITH_DHCP
1316         { "dhcp",       RAD_LISTEN_DHCP },
1317 #else
1318         { "dhcp",       RAD_LISTEN_NONE },
1319 #endif
1320         { NULL, 0 },
1321 };
1322
1323
1324 static rad_listen_t *listen_parse(CONF_SECTION *cs, const char *server)
1325 {
1326         int             type, rcode;
1327         char            *listen_type;
1328         rad_listen_t    *this;
1329
1330         listen_type = NULL;
1331
1332         cf_log_info(cs, "listen {");
1333
1334         rcode = cf_item_parse(cs, "type", PW_TYPE_STRING_PTR,
1335                               &listen_type, "");
1336         if (rcode < 0) return NULL;
1337         if (rcode == 1) {
1338                 free(listen_type);
1339                 cf_log_err(cf_sectiontoitem(cs),
1340                            "No type specified in listen section");
1341                 return NULL;
1342         }
1343
1344         type = fr_str2int(listen_compare, listen_type,
1345                             RAD_LISTEN_NONE);
1346         if (type == RAD_LISTEN_NONE) {
1347                 cf_log_err(cf_sectiontoitem(cs),
1348                            "Invalid type \"%s\" in listen section.",
1349                            listen_type);
1350                 free(listen_type);
1351                 return NULL;
1352         }
1353         free(listen_type);
1354
1355         /*
1356          *      Allow listen sections in the default config to
1357          *      refer to a server.
1358          */
1359         if (!server) {
1360                 rcode = cf_item_parse(cs, "virtual_server", PW_TYPE_STRING_PTR,
1361                                       &server, NULL);
1362                 if (rcode == 1) { /* compatiblity with 2.0-pre */
1363                         rcode = cf_item_parse(cs, "server", PW_TYPE_STRING_PTR,
1364                                               &server, NULL);
1365                 }
1366                 if (rcode < 0) return NULL;
1367         }
1368
1369         /*
1370          *      Set up cross-type data.
1371          */
1372         this = listen_alloc(type);
1373         this->server = server;
1374         this->fd = -1;
1375
1376         /*
1377          *      Call per-type parser.
1378          */
1379         if (master_listen[type].parse(cs, this) < 0) {
1380                 listen_free(&this);
1381                 return NULL;
1382         }
1383
1384         cf_log_info(cs, "}");
1385
1386         return this;
1387 }
1388
1389 /*
1390  *      Generate a list of listeners.  Takes an input list of
1391  *      listeners, too, so we don't close sockets with waiting packets.
1392  */
1393 int listen_init(CONF_SECTION *config, rad_listen_t **head)
1394 {
1395         int             override = FALSE;
1396         int             rcode;
1397         CONF_SECTION    *cs;
1398         rad_listen_t    **last;
1399         rad_listen_t    *this;
1400         fr_ipaddr_t     server_ipaddr;
1401         int             auth_port = 0;
1402 #ifdef WITH_PROXY
1403         int             defined_proxy = 0;
1404 #endif
1405
1406         /*
1407          *      We shouldn't be called with a pre-existing list.
1408          */
1409         rad_assert(head && (*head == NULL));
1410
1411         last = head;
1412         server_ipaddr.af = AF_UNSPEC;
1413
1414         /*
1415          *      If the port is specified on the command-line,
1416          *      it over-rides the configuration file.
1417          *
1418          *      FIXME: If argv[0] == "vmpsd", then don't listen on auth/acct!
1419          */
1420         if (mainconfig.port >= 0) auth_port = mainconfig.port;
1421
1422         /*
1423          *      If the IP address was configured on the command-line,
1424          *      use that as the "bind_address"
1425          */
1426         if (mainconfig.myip.af != AF_UNSPEC) {
1427                 memcpy(&server_ipaddr, &mainconfig.myip,
1428                        sizeof(server_ipaddr));
1429                 override = TRUE;
1430                 goto bind_it;
1431         }
1432
1433         /*
1434          *      Else look for bind_address and/or listen sections.
1435          */
1436         server_ipaddr.ipaddr.ip4addr.s_addr = htonl(INADDR_NONE);
1437         rcode = cf_item_parse(config, "bind_address",
1438                               PW_TYPE_IPADDR,
1439                               &server_ipaddr.ipaddr.ip4addr, NULL);
1440         if (rcode < 0) return -1; /* error parsing it */
1441
1442         if (rcode == 0) { /* successfully parsed IPv4 */
1443                 listen_socket_t *sock;
1444                 server_ipaddr.af = AF_INET;
1445
1446                 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'.");
1447
1448         bind_it:
1449 #ifdef WITH_VMPS
1450                 if (strcmp(progname, "vmpsd") == 0) {
1451                         this = listen_alloc(RAD_LISTEN_VQP);
1452                         if (!auth_port) auth_port = 1589;
1453                 } else
1454 #endif
1455                         this = listen_alloc(RAD_LISTEN_AUTH);
1456
1457                 sock = this->data;
1458
1459                 sock->ipaddr = server_ipaddr;
1460                 sock->port = auth_port;
1461
1462                 sock->clients = clients_parse_section(config);
1463                 if (!sock->clients) {
1464                         cf_log_err(cf_sectiontoitem(config),
1465                                    "Failed to find any clients for this listen section");
1466                         return -1;
1467                 }
1468
1469                 if (listen_bind(this) < 0) {
1470                         listen_free(&this);
1471                         listen_free(head);
1472                         radlog(L_ERR, "There appears to be another RADIUS server running on the authentication port %d", sock->port);
1473                         return -1;
1474                 }
1475                 auth_port = sock->port; /* may have been updated in listen_bind */
1476                 if (override) {
1477                         cs = cf_section_sub_find_name2(config, "server",
1478                                                        mainconfig.name);
1479                         if (cs) this->server = mainconfig.name;
1480                 }
1481
1482                 *last = this;
1483                 last = &(this->next);
1484
1485 #ifdef WITH_VMPS
1486                 /*
1487                  *      No acct for vmpsd
1488                  */
1489                 if (strcmp(progname, "vmpsd") == 0) goto do_proxy;
1490 #endif
1491
1492 #ifdef WITH_ACCOUNTING
1493                 /*
1494                  *      Open Accounting Socket.
1495                  *
1496                  *      If we haven't already gotten acct_port from
1497                  *      /etc/services, then make it auth_port + 1.
1498                  */
1499                 this = listen_alloc(RAD_LISTEN_ACCT);
1500                 sock = this->data;
1501
1502                 /*
1503                  *      Create the accounting socket.
1504                  *
1505                  *      The accounting port is always the
1506                  *      authentication port + 1
1507                  */
1508                 sock->ipaddr = server_ipaddr;
1509                 sock->port = auth_port + 1;
1510
1511                 sock->clients = clients_parse_section(config);
1512                 if (!sock->clients) {
1513                         cf_log_err(cf_sectiontoitem(config),
1514                                    "Failed to find any clients for this listen section");
1515                         return -1;
1516                 }
1517
1518                 if (listen_bind(this) < 0) {
1519                         listen_free(&this);
1520                         listen_free(head);
1521                         radlog(L_ERR, "There appears to be another RADIUS server running on the accounting port %d", sock->port);
1522                         return -1;
1523                 }
1524
1525                 if (override) {
1526                         cs = cf_section_sub_find_name2(config, "server",
1527                                                        mainconfig.name);
1528                         if (cs) this->server = mainconfig.name;
1529                 }
1530
1531                 *last = this;
1532                 last = &(this->next);
1533 #endif
1534         } else if (mainconfig.port > 0) { /* no bind address, but a port */
1535                 radlog(L_ERR, "The command-line says \"-p %d\", but there is no associated IP address to use",
1536                        mainconfig.port);
1537                 return -1;
1538         }
1539
1540         /*
1541          *      They specified an IP on the command-line, ignore
1542          *      all listen sections except the one in '-n'.
1543          */
1544         if (mainconfig.myip.af != AF_UNSPEC) {
1545                 CONF_SECTION *subcs;
1546                 const char *name2 = cf_section_name2(cs);
1547
1548                 cs = cf_section_sub_find_name2(config, "server",
1549                                                mainconfig.name);
1550                 if (!cs) goto do_proxy;
1551
1552                 /*
1553                  *      Should really abstract this code...
1554                  */
1555                 for (subcs = cf_subsection_find_next(cs, NULL, "listen");
1556                      subcs != NULL;
1557                      subcs = cf_subsection_find_next(cs, subcs, "listen")) {
1558                         this = listen_parse(subcs, name2);
1559                         if (!this) {
1560                                 listen_free(head);
1561                                 return -1;
1562                         }
1563
1564 #ifdef WITH_PROXY
1565                         if (this->type == RAD_LISTEN_PROXY) defined_proxy = 1;
1566 #endif
1567
1568                         *last = this;
1569                         last = &(this->next);
1570                 } /* loop over "listen" directives in server <foo> */
1571
1572                 goto do_proxy;
1573         }
1574
1575         /*
1576          *      Walk through the "listen" sections, if they exist.
1577          */
1578         for (cs = cf_subsection_find_next(config, NULL, "listen");
1579              cs != NULL;
1580              cs = cf_subsection_find_next(config, cs, "listen")) {
1581                 this = listen_parse(cs, NULL);
1582                 if (!this) {
1583                         listen_free(head);
1584                         return -1;
1585                 }
1586
1587 #ifdef WITH_PROXY
1588                 if (this->type == RAD_LISTEN_PROXY) defined_proxy = 1;
1589 #endif
1590
1591                 *last = this;
1592                 last = &(this->next);
1593         }
1594
1595         /*
1596          *      Check virtual servers for "listen" sections, too.
1597          *
1598          *      FIXME: Move to virtual server init?
1599          */
1600         for (cs = cf_subsection_find_next(config, NULL, "server");
1601              cs != NULL;
1602              cs = cf_subsection_find_next(config, cs, "server")) {
1603                 CONF_SECTION *subcs;
1604                 const char *name2 = cf_section_name2(cs);
1605
1606                 for (subcs = cf_subsection_find_next(cs, NULL, "listen");
1607                      subcs != NULL;
1608                      subcs = cf_subsection_find_next(cs, subcs, "listen")) {
1609                         this = listen_parse(subcs, name2);
1610                         if (!this) {
1611                                 listen_free(head);
1612                                 return -1;
1613                         }
1614
1615 #ifdef WITH_PROXY
1616                         if (this->type == RAD_LISTEN_PROXY) {
1617                                 radlog(L_ERR, "Error: listen type \"proxy\" Cannot appear in a virtual server section");
1618                                 listen_free(head);
1619                                 return -1;
1620                         }
1621 #endif
1622
1623                         *last = this;
1624                         last = &(this->next);
1625                 } /* loop over "listen" directives in virtual servers */
1626         } /* loop over virtual servers */
1627
1628         /*
1629          *      If we're proxying requests, open the proxy FD.
1630          *      Otherwise, don't do anything.
1631          */
1632  do_proxy:
1633 #ifdef WITH_PROXY
1634         if (mainconfig.proxy_requests == TRUE) {
1635                 int             port = -1;
1636                 listen_socket_t *sock = NULL;
1637
1638                 /*
1639                  *      No sockets to receive packets, therefore
1640                  *      proxying is pointless.
1641                  */
1642                 if (!*head) return -1;
1643
1644                 if (defined_proxy) goto do_snmp;
1645
1646                 /*
1647                  *      Find the first authentication port,
1648                  *      and use it
1649                  */
1650                 for (this = *head; this != NULL; this = this->next) {
1651                         if (this->type == RAD_LISTEN_AUTH) {
1652                                 sock = this->data;
1653                                 if (server_ipaddr.af == AF_UNSPEC) {
1654                                         server_ipaddr = sock->ipaddr;
1655                                 }
1656                                 port = sock->port + 2; /* skip acct port */
1657                                 break;
1658                         }
1659                         if (this->type == RAD_LISTEN_VQP) {
1660                                 sock = this->data;
1661                                 if (server_ipaddr.af == AF_UNSPEC) {
1662                                         server_ipaddr = sock->ipaddr;
1663                                 }
1664                                 port = sock->port + 1;
1665                                 break;
1666                         }
1667                 }
1668
1669                 if (port < 0) port = 1024 + (fr_rand() & 0x1ff);
1670
1671                 /*
1672                  *      Address is still unspecified, use IPv4.
1673                  */
1674                 if (server_ipaddr.af == AF_UNSPEC) {
1675                         server_ipaddr.af = AF_INET;
1676                         server_ipaddr.ipaddr.ip4addr.s_addr = htonl(INADDR_ANY);
1677                 }
1678
1679                 this = listen_alloc(RAD_LISTEN_PROXY);
1680                 sock = this->data;
1681
1682                 /*
1683                  *      Create the first proxy socket.
1684                  */
1685                 sock->ipaddr = server_ipaddr;
1686
1687                 /*
1688                  *      Try to find a proxy port (value doesn't matter)
1689                  */
1690                 for (sock->port = port;
1691                      sock->port < 64000;
1692                      sock->port++) {
1693                         if (listen_bind(this) == 0) {
1694                                 *last = this;
1695                                 last = &(this->next); /* just in case */
1696                                 break;
1697                         }
1698                 }
1699
1700                 if (sock->port >= 64000) {
1701                         listen_free(head);
1702                         listen_free(&this);
1703                         radlog(L_ERR, "Failed to open socket for proxying");
1704                         return -1;
1705                 }
1706         }
1707
1708  do_snmp:                       /* used only in proxy code. */
1709 #endif
1710
1711 #ifdef WITH_SNMP
1712         if (radius_snmp_init(config)) {
1713                 this = rad_malloc(sizeof(*this));
1714                 memset(this, 0, sizeof(*this));
1715
1716                 this->type = RAD_LISTEN_SNMP;
1717                 this->fd = rad_snmp.smux_fd;
1718
1719                 this->recv = radius_snmp_recv;
1720                 this->print = radius_snmp_print;
1721
1722                 *last = this;
1723                 last = &(this->next);
1724         }
1725 #endif
1726
1727         return 0;
1728 }
1729
1730 /*
1731  *      Free a linked list of listeners;
1732  */
1733 void listen_free(rad_listen_t **head)
1734 {
1735         rad_listen_t *this;
1736
1737         if (!head || !*head) return;
1738
1739         this = *head;
1740         while (this) {
1741                 rad_listen_t *next = this->next;
1742
1743                 /*
1744                  *      Other code may have eaten the FD.
1745                  */
1746                 if (this->fd >= 0) close(this->fd);
1747
1748                 if (master_listen[this->type].free) {
1749                         master_listen[this->type].free(this);
1750                 }
1751                 free(this->data);
1752                 free(this);
1753
1754                 this = next;
1755         }
1756
1757         *head = NULL;
1758 }
1759
1760 #ifdef WITH_STATS
1761 RADCLIENT_LIST *listener_find_client_list(const fr_ipaddr_t *ipaddr,
1762                                           int port)
1763 {
1764         rad_listen_t *this;
1765
1766         for (this = mainconfig.listen; this != NULL; this = this->next) {
1767                 listen_socket_t *sock;
1768
1769                 if ((this->type != RAD_LISTEN_AUTH) &&
1770                     (this->type != RAD_LISTEN_ACCT)) continue;
1771
1772                 sock = this->data;
1773
1774                 if ((sock->port == port) &&
1775                     (fr_ipaddr_cmp(ipaddr, &sock->ipaddr) == 0)) {
1776                         return sock->clients;
1777                 }
1778         }
1779
1780         return NULL;
1781 }
1782
1783 rad_listen_t *listener_find_byipaddr(const fr_ipaddr_t *ipaddr, int port)
1784 {
1785         rad_listen_t *this;
1786
1787         for (this = mainconfig.listen; this != NULL; this = this->next) {
1788                 listen_socket_t *sock;
1789
1790                 if ((this->type != RAD_LISTEN_AUTH) &&
1791                     (this->type != RAD_LISTEN_ACCT)) continue;
1792
1793                 sock = this->data;
1794
1795                 if ((sock->port == port) &&
1796                     (fr_ipaddr_cmp(ipaddr, &sock->ipaddr) == 0)) {
1797                         return this;
1798                 }
1799         }
1800
1801         return NULL;
1802 }
1803 #endif