src/main/event.c

   1 /*
   2  * event.c      Server event handling
   3  *
   4  * Version:     $Id$
   5  *
   6  *   This program is free software; you can redistribute it and/or modify
   7  *   it under the terms of the GNU General Public License as published by
   8  *   the Free Software Foundation; either version 2 of the License, or
   9  *   (at your option) any later version.
  10  *
  11  *   This program is distributed in the hope that it will be useful,
  12  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  *   GNU General Public License for more details.
  15  *
  16  *   You should have received a copy of the GNU General Public License
  17  *   along with this program; if not, write to the Free Software
  18  *   Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
  19  *
  20  * Copyright 2007  The FreeRADIUS server project
  21  * Copyright 2007  Alan DeKok <aland@deployingradius.com>
  22  */
  23
  24 #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/event.h>
  30 #include <freeradius-devel/detail.h>
  31
  32 #include <freeradius-devel/rad_assert.h>
  33
  34 #include <signal.h>
  35 #include <fcntl.h>
  36
  37 #ifdef HAVE_SYS_WAIT_H
  38 #       include <sys/wait.h>
  39 #endif
  40
  41 #define USEC (1000000)
  42
  43 extern pid_t radius_pid;
  44 extern int dont_fork;
  45 extern int check_config;
  46 extern void force_log_reopen(void);
  47 extern char *debug_condition;
  48
  49 /*
  50  *      Ridiculous amounts of local state.
  51  */
  52 static fr_event_list_t  *el = NULL;
  53 static fr_packet_list_t *pl = NULL;
  54 static int                      request_num_counter = 0;
  55 static struct timeval           now;
  56 time_t                          fr_start_time;
  57 static int                      have_children;
  58 static int                      just_started = TRUE;
  59
  60 #ifndef __MINGW32__
  61 #ifdef HAVE_PTHREAD_H
  62 #define WITH_SELF_PIPE (1)
  63 #endif
  64 #endif
  65
  66 #ifdef WITH_SELF_PIPE
  67 static int self_pipe[2];
  68 #endif
  69
  70 #ifdef HAVE_PTHREAD_H
  71 #ifdef WITH_PROXY
  72 static pthread_mutex_t  proxy_mutex;
  73 #endif
  74
  75 #define PTHREAD_MUTEX_LOCK if (have_children) pthread_mutex_lock
  76 #define PTHREAD_MUTEX_UNLOCK if (have_children) pthread_mutex_unlock
  77
  78 static pthread_t NO_SUCH_CHILD_PID;
  79 #else
  80 /*
  81  *      This is easier than ifdef's throughout the code.
  82  */
  83 #define PTHREAD_MUTEX_LOCK(_x)
  84 #define PTHREAD_MUTEX_UNLOCK(_x)
  85 int thread_pool_addrequest(REQUEST *request, RAD_REQUEST_FUNP fun)
  86 {
  87         radius_handle_request(request, fun);
  88         return 1;
  89 }
  90 #endif
  91
  92 #define INSERT_EVENT(_function, _ctx) if (!fr_event_insert(el, _function, _ctx, &((_ctx)->when), &((_ctx)->ev))) { _rad_panic(__FILE__, __LINE__, "Failed to insert event"); }
  93
  94 #ifdef WITH_PROXY
  95 static fr_packet_list_t *proxy_list = NULL;
  96
  97 /*
  98  *      We keep the proxy FD's here.  The RADIUS Id's are marked
  99  *      "allocated" per Id, via a bit per proxy FD.
 100  */
 101 static int              proxy_fds[32];
 102 static rad_listen_t     *proxy_listeners[32];
 103 #else
 104 #define remove_from_proxy_hash(foo)
 105 #endif
 106
 107 static void request_post_handler(REQUEST *request);
 108 static void wait_a_bit(void *ctx);
 109 static void event_socket_handler(fr_event_list_t *xel, UNUSED int fd, void *ctx);
 110 #ifdef WITH_DETAIL
 111 static void event_poll_detail(void *ctx);
 112 #endif
 113
 114 static void NEVER_RETURNS _rad_panic(const char *file, unsigned int line,
 115                                     const char *msg)
 116 {
 117         radlog(L_ERR, "[%s:%d] %s", file, line, msg);
 118         _exit(1);
 119 }
 120
 121 #define rad_panic(x) _rad_panic(__FILE__, __LINE__, x)
 122
 123
 124 static void tv_add(struct timeval *tv, int usec_delay)
 125 {
 126         if (usec_delay > USEC) {
 127                 tv->tv_sec += usec_delay / USEC;
 128                 usec_delay %= USEC;
 129         }
 130         tv->tv_usec += usec_delay;
 131
 132         if (tv->tv_usec > USEC) {
 133                 tv->tv_usec -= USEC;
 134                 tv->tv_sec++;
 135         }
 136 }
 137
 138 static void remove_from_request_hash(REQUEST *request)
 139 {
 140         if (!request->in_request_hash) return;
 141
 142         fr_packet_list_yank(pl, request->packet);
 143         request->in_request_hash = FALSE;
 144
 145         request_stats_final(request);
 146 }
 147
 148
 149 #ifdef WITH_PROXY
 150 static REQUEST *lookup_in_proxy_hash(RADIUS_PACKET *reply)
 151 {
 152         RADIUS_PACKET **proxy_p;
 153         REQUEST *request;
 154
 155         PTHREAD_MUTEX_LOCK(&proxy_mutex);
 156         proxy_p = fr_packet_list_find_byreply(proxy_list, reply);
 157
 158         if (!proxy_p) {
 159                 PTHREAD_MUTEX_UNLOCK(&proxy_mutex);
 160                 return NULL;
 161         }
 162
 163         request = fr_packet2myptr(REQUEST, proxy, proxy_p);
 164
 165         if (!request) {
 166                 PTHREAD_MUTEX_UNLOCK(&proxy_mutex);
 167                 return NULL;
 168         }
 169
 170         request->num_proxied_responses++;
 171
 172         /*
 173          *      Catch the most common case of everything working
 174          *      correctly.
 175          */
 176         if (request->num_proxied_requests == request->num_proxied_responses) {
 177                 fr_packet_list_yank(proxy_list, request->proxy);
 178                 fr_packet_list_id_free(proxy_list, request->proxy);
 179                 request->in_proxy_hash = FALSE;
 180         }
 181
 182         /*
 183          *      On the FIRST reply, decrement the count of outstanding
 184          *      requests.  Note that this is NOT the count of sent
 185          *      packets, but whether or not the home server has
 186          *      responded at all.
 187          */
 188         if (!request->proxy_reply &&
 189             request->home_server &&
 190             request->home_server->currently_outstanding) {
 191                 request->home_server->currently_outstanding--;
 192         }
 193
 194         PTHREAD_MUTEX_UNLOCK(&proxy_mutex);
 195
 196         return request;
 197 }
 198
 199
 200 static void remove_from_proxy_hash(REQUEST *request)
 201 {
 202         /*
 203          *      Check this without grabbing the mutex because it's a
 204          *      lot faster that way.
 205          */
 206         if (!request->in_proxy_hash) return;
 207
 208         /*
 209          *      The "not in hash" flag is definitive.  However, if the
 210          *      flag says that it IS in the hash, there might still be
 211          *      a race condition where it isn't.
 212          */
 213         PTHREAD_MUTEX_LOCK(&proxy_mutex);
 214
 215         if (!request->in_proxy_hash) {
 216                 PTHREAD_MUTEX_UNLOCK(&proxy_mutex);
 217                 return;
 218         }
 219
 220         fr_packet_list_yank(proxy_list, request->proxy);
 221         fr_packet_list_id_free(proxy_list, request->proxy);
 222
 223         /*
 224          *      The home server hasn't replied, but we've given up on
 225          *      this request.  Don't count this request against the
 226          *      home server.
 227          */
 228         if (!request->proxy_reply &&
 229             request->home_server &&
 230             request->home_server->currently_outstanding) {
 231                 request->home_server->currently_outstanding--;
 232         }
 233
 234         /*
 235          *      Got from YES in hash, to NO, not in hash while we hold
 236          *      the mutex.  This guarantees that when another thread
 237          *      grans the mutex, the "not in hash" flag is correct.
 238          */
 239         request->in_proxy_hash = FALSE;
 240
 241         PTHREAD_MUTEX_UNLOCK(&proxy_mutex);
 242 }
 243
 244 static void ev_request_free(REQUEST **prequest)
 245 {
 246         REQUEST *request;
 247
 248         if (!prequest || !*prequest) return;
 249
 250         request = *prequest;
 251
 252 #ifdef WITH_COA
 253         if (request->coa) {
 254                 /*
 255                  *      Divorce the child from the parent first,
 256                  *      then clean up the child.
 257                  */
 258                 request->coa->parent = NULL;
 259                 ev_request_free(&request->coa);
 260         }
 261
 262         /*
 263          *      Divorce the parent from the child, and leave the
 264          *      parent still alive.
 265          */
 266         if (request->parent && (request->parent->coa == request)) {
 267                 request->parent->coa = NULL;
 268         }
 269 #endif
 270
 271         if (request->ev) fr_event_delete(el, &request->ev);
 272         if (request->in_proxy_hash) remove_from_proxy_hash(request);
 273         if (request->in_request_hash) remove_from_request_hash(request);
 274
 275         request_free(prequest);
 276 }
 277
 278 static int proxy_id_alloc(REQUEST *request, RADIUS_PACKET *packet)
 279 {
 280         int i, proxy, found;
 281         rad_listen_t *proxy_listener;
 282
 283         if (fr_packet_list_id_alloc(proxy_list, packet)) return 1;
 284
 285         /*
 286          *      Allocate a new proxy fd.  This function adds
 287          *      it to the tail of the list of listeners.  With
 288          *      some care, this can be thread-safe.
 289          */
 290         proxy_listener = proxy_new_listener(&packet->src_ipaddr, FALSE);
 291         if (!proxy_listener) {
 292                 RDEBUG2("ERROR: Failed to create a new socket for proxying requests.");
 293                 return 0;
 294         }
 295
 296         /*
 297          *      Cache it locally.
 298          */
 299         found = -1;
 300         proxy = proxy_listener->fd;
 301         for (i = 0; i < 32; i++) {
 302                 /*
 303                  *      Found a free entry.  Save the socket,
 304                  *      and remember where we saved it.
 305                  */
 306                 if (proxy_fds[(proxy + i) & 0x1f] == -1) {
 307                         found = (proxy + i) & 0x1f;
 308                         proxy_fds[found] = proxy;
 309                         proxy_listeners[found] = proxy_listener;
 310                         break;
 311                 }
 312         }
 313         rad_assert(found >= 0);
 314
 315         if (!fr_packet_list_socket_add(proxy_list, proxy_listener->fd)) {
 316                         RDEBUG2("ERROR: Failed to create a new socket for proxying requests.");
 317                 return 0;
 318
 319         }
 320
 321         if (!fr_packet_list_id_alloc(proxy_list, packet)) {
 322                         RDEBUG2("ERROR: Failed to create a new socket for proxying requests.");
 323                 return 0;
 324         }
 325
 326         /*
 327          *      Signal the main thread to add the new FD to the list
 328          *      of listening FD's.
 329          */
 330         radius_signal_self(RADIUS_SIGNAL_SELF_NEW_FD);
 331         return 1;
 332 }
 333
 334
 335 static int insert_into_proxy_hash(REQUEST *request, int retransmit)
 336 {
 337         int i, proxy;
 338         char buf[128];
 339
 340         rad_assert(request->proxy != NULL);
 341         rad_assert(proxy_list != NULL);
 342
 343         PTHREAD_MUTEX_LOCK(&proxy_mutex);
 344
 345         /*
 346          *      Keep track of maximum outstanding requests to a
 347          *      particular home server.  'max_outstanding' is
 348          *      enforced in home_server_ldb(), in realms.c.
 349          */
 350         if (request->home_server) {
 351                 request->home_server->currently_outstanding++;
 352         }
 353
 354         if (retransmit) {
 355                 RADIUS_PACKET packet;
 356
 357                 packet = *request->proxy;
 358
 359                 if (!proxy_id_alloc(request, &packet)) {
 360                         PTHREAD_MUTEX_UNLOCK(&proxy_mutex);
 361                         return 0;
 362                 }
 363
 364                 /*
 365                  *      Yank the request, free the old Id, and
 366                  *      remember the new Id.
 367                  */
 368                 fr_packet_list_yank(proxy_list, request->proxy);
 369                 fr_packet_list_id_free(proxy_list, request->proxy);
 370                 *request->proxy = packet;
 371
 372         } else if (!proxy_id_alloc(request, request->proxy)) {
 373                 PTHREAD_MUTEX_UNLOCK(&proxy_mutex);
 374                 return 0;
 375         }
 376
 377         rad_assert(request->proxy->sockfd >= 0);
 378
 379         /*
 380          *      FIXME: Hack until we get rid of rad_listen_t, and put
 381          *      the information into the packet_list.
 382          */
 383         proxy = -1;
 384         for (i = 0; i < 32; i++) {
 385                 if (proxy_fds[i] == request->proxy->sockfd) {
 386                         proxy = i;
 387                         break;
 388                 }
 389         }
 390
 391         if (proxy < 0) {
 392                 PTHREAD_MUTEX_UNLOCK(&proxy_mutex);
 393                 RDEBUG2("ERROR: All sockets are full.");
 394                 return 0;
 395         }
 396
 397         rad_assert(proxy_fds[proxy] != -1);
 398         rad_assert(proxy_listeners[proxy] != NULL);
 399         request->proxy_listener = proxy_listeners[proxy];
 400
 401         if (!fr_packet_list_insert(proxy_list, &request->proxy)) {
 402                 fr_packet_list_id_free(proxy_list, request->proxy);
 403                 PTHREAD_MUTEX_UNLOCK(&proxy_mutex);
 404                 RDEBUG2("ERROR: Failed to insert entry into proxy list");
 405                 return 0;
 406         }
 407
 408         request->in_proxy_hash = TRUE;
 409
 410         PTHREAD_MUTEX_UNLOCK(&proxy_mutex);
 411
 412         RDEBUG3(" proxy: allocating destination %s port %d - Id %d",
 413                inet_ntop(request->proxy->dst_ipaddr.af,
 414                          &request->proxy->dst_ipaddr.ipaddr, buf, sizeof(buf)),
 415                request->proxy->dst_port,
 416                request->proxy->id);
 417
 418         return 1;
 419 }
 420
 421
 422 /*
 423  *      Called as BOTH an event, and in-line from other functions.
 424  */
 425 static void wait_for_proxy_id_to_expire(void *ctx)
 426 {
 427         REQUEST *request = ctx;
 428
 429         rad_assert(request->magic == REQUEST_MAGIC);
 430         rad_assert(request->proxy != NULL);
 431
 432         if (!fr_event_now(el, &now)) gettimeofday(&now, NULL);
 433         request->when = request->proxy_when;
 434
 435 #ifdef WITH_COA
 436         if (((request->proxy->code == PW_COA_REQUEST) ||
 437              (request->proxy->code == PW_DISCONNECT_REQUEST)) &&
 438             (request->packet->code != request->proxy->code)) {
 439                 request->when.tv_sec += request->home_server->coa_mrd;
 440         } else
 441 #endif
 442         request->when.tv_sec += request->home_server->response_window;
 443
 444         if ((request->num_proxied_requests == request->num_proxied_responses) ||
 445             timercmp(&now, &request->when, >)) {
 446                 if (request->packet) {
 447                         RDEBUG2("Cleaning up request %d ID %d with timestamp +%d",
 448                                request->number, request->packet->id,
 449                                (unsigned int) (request->timestamp - fr_start_time));
 450                 } else {
 451                         RDEBUG2("Cleaning up request %d with timestamp +%d",
 452                                request->number,
 453                                (unsigned int) (request->timestamp - fr_start_time));
 454                 }
 455
 456                 ev_request_free(&request);
 457                 return;
 458         }
 459
 460         INSERT_EVENT(wait_for_proxy_id_to_expire, request);
 461 }
 462 #endif
 463
 464 #ifdef HAVE_PTHREAD_H
 465 static void wait_for_child_to_die(void *ctx)
 466 {
 467         REQUEST *request = ctx;
 468
 469         rad_assert(request->magic == REQUEST_MAGIC);
 470
 471         if ((request->child_state == REQUEST_QUEUED) |
 472             (request->child_state == REQUEST_RUNNING)) {
 473                 request->delay += (request->delay >> 1);
 474                 tv_add(&request->when, request->delay);
 475
 476                 RDEBUG2("Child is still stuck for request %d", request->number);
 477
 478                 INSERT_EVENT(wait_for_child_to_die, request);
 479                 return;
 480         }
 481
 482         RDEBUG2("Child is finally responsive for request %d", request->number);
 483         remove_from_request_hash(request);
 484
 485 #ifdef WITH_PROXY
 486         if (request->proxy) {
 487                 wait_for_proxy_id_to_expire(request);
 488                 return;
 489         }
 490 #endif
 491
 492         ev_request_free(&request);
 493 }
 494 #endif
 495
 496 static void cleanup_delay(void *ctx)
 497 {
 498         REQUEST *request = ctx;
 499
 500         rad_assert(request->magic == REQUEST_MAGIC);
 501         rad_assert((request->child_state == REQUEST_CLEANUP_DELAY) ||
 502                    (request->child_state == REQUEST_DONE));
 503
 504         remove_from_request_hash(request);
 505
 506 #ifdef WITH_PROXY
 507         if (request->proxy && request->in_proxy_hash) {
 508                 wait_for_proxy_id_to_expire(request);
 509                 return;
 510         }
 511 #endif
 512
 513         RDEBUG2("Cleaning up request %d ID %d with timestamp +%d",
 514                request->number, request->packet->id,
 515                (unsigned int) (request->timestamp - fr_start_time));
 516
 517         ev_request_free(&request);
 518 }
 519
 520
 521 /*
 522  *      FIXME: Put into a libradius function.
 523  */
 524 #define MAX_PACKET_CODE (52)
 525 static const char *packet_codes[] = {
 526   "",
 527   "Access-Request",
 528   "Access-Accept",
 529   "Access-Reject",
 530   "Accounting-Request",
 531   "Accounting-Response",
 532   "Accounting-Status",
 533   "Password-Request",
 534   "Password-Accept",
 535   "Password-Reject",
 536   "Accounting-Message",
 537   "Access-Challenge",
 538   "Status-Server",
 539   "Status-Client",
 540   "14",
 541   "15",
 542   "16",
 543   "17",
 544   "18",
 545   "19",
 546   "20",
 547   "Resource-Free-Request",
 548   "Resource-Free-Response",
 549   "Resource-Query-Request",
 550   "Resource-Query-Response",
 551   "Alternate-Resource-Reclaim-Request",
 552   "NAS-Reboot-Request",
 553   "NAS-Reboot-Response",
 554   "28",
 555   "Next-Passcode",
 556   "New-Pin",
 557   "Terminate-Session",
 558   "Password-Expired",
 559   "Event-Request",
 560   "Event-Response",
 561   "35",
 562   "36",
 563   "37",
 564   "38",
 565   "39",
 566   "Disconnect-Request",
 567   "Disconnect-ACK",
 568   "Disconnect-NAK",
 569   "CoA-Request",
 570   "CoA-ACK",
 571   "CoA-NAK",
 572   "46",
 573   "47",
 574   "48",
 575   "49",
 576   "IP-Address-Allocate",
 577   "IP-Address-Release"
 578 };
 579
 580
 581 /*
 582  *      In daemon mode, AND this request has debug flags set.
 583  */
 584 #define DEBUG_PACKET if (!debug_flag && request->options && request->radlog) debug_packet
 585
 586 static void debug_packet(REQUEST *request, RADIUS_PACKET *packet, int direction)
 587 {
 588         VALUE_PAIR *vp;
 589         char buffer[1024];
 590         const char *received, *from;
 591         const fr_ipaddr_t *ip;
 592         int port;
 593
 594         if (!packet) return;
 595
 596         rad_assert(request->radlog != NULL);
 597
 598         if (direction == 0) {
 599                 received = "Received";
 600                 from = "from";  /* what else? */
 601                 ip = &packet->src_ipaddr;
 602                 port = packet->src_port;
 603
 604         } else {
 605                 received = "Sending";
 606                 from = "to";    /* hah! */
 607                 ip = &packet->dst_ipaddr;
 608                 port = packet->dst_port;
 609         }
 610
 611         /*
 612          *      Client-specific debugging re-prints the input
 613          *      packet into the client log.
 614          *
 615          *      This really belongs in a utility library
 616          */
 617         if ((packet->code > 0) && (packet->code < MAX_PACKET_CODE)) {
 618                 RDEBUG("%s %s packet %s host %s port %d, id=%d, length=%d",
 619                        received, packet_codes[packet->code], from,
 620                        inet_ntop(ip->af, &ip->ipaddr, buffer, sizeof(buffer)),
 621                        port, packet->id, packet->data_len);
 622         } else {
 623                 RDEBUG("%s packet %s host %s port %d code=%d, id=%d, length=%d",
 624                        received, from,
 625                        inet_ntop(ip->af, &ip->ipaddr, buffer, sizeof(buffer)),
 626                        port,
 627                        packet->code, packet->id, packet->data_len);
 628         }
 629
 630         for (vp = packet->vps; vp != NULL; vp = vp->next) {
 631                 vp_prints(buffer, sizeof(buffer), vp);
 632                 request->radlog(L_DBG, 0, request, "\t%s", buffer);
 633         }
 634 }
 635
 636 static void reject_delay(void *ctx)
 637 {
 638         REQUEST *request = ctx;
 639
 640         rad_assert(request->magic == REQUEST_MAGIC);
 641         rad_assert(request->child_state == REQUEST_REJECT_DELAY);
 642
 643         RDEBUG2("Sending delayed reject for request %d", request->number);
 644
 645         DEBUG_PACKET(request, request->reply, 1);
 646
 647         request->listener->send(request->listener, request);
 648
 649         request->when.tv_sec += request->root->cleanup_delay;
 650         request->child_state = REQUEST_CLEANUP_DELAY;
 651
 652         INSERT_EVENT(cleanup_delay, request);
 653 }
 654
 655
 656 #ifdef WITH_PROXY
 657 void revive_home_server(void *ctx)
 658 {
 659         home_server *home = ctx;
 660         char buffer[128];
 661
 662         home->state = HOME_STATE_ALIVE;
 663         home->currently_outstanding = 0;
 664         home->revive_time = now;
 665
 666         /*
 667          *      Delete any outstanding events.
 668          */
 669         if (home->ev) fr_event_delete(el, &home->ev);
 670
 671         radlog(L_INFO, "PROXY: Marking home server %s port %d alive again... we have no idea if it really is alive or not.",
 672                inet_ntop(home->ipaddr.af, &home->ipaddr.ipaddr,
 673                          buffer, sizeof(buffer)),
 674                home->port);
 675
 676 }
 677
 678
 679 static void no_response_to_ping(void *ctx)
 680 {
 681         REQUEST *request = ctx;
 682         home_server *home;
 683         char buffer[128];
 684
 685         rad_assert(request->home_server != NULL);
 686
 687         home = request->home_server;
 688         home->num_received_pings = 0;
 689
 690         RDEBUG2("No response to status check %d from home server %s port %d",
 691                request->number,
 692                inet_ntop(request->proxy->dst_ipaddr.af,
 693                          &request->proxy->dst_ipaddr.ipaddr,
 694                          buffer, sizeof(buffer)),
 695                request->proxy->dst_port);
 696
 697         wait_for_proxy_id_to_expire(request);
 698 }
 699
 700
 701 static void received_response_to_ping(REQUEST *request)
 702 {
 703         home_server *home;
 704         char buffer[128];
 705
 706         rad_assert(request->home_server != NULL);
 707
 708         home = request->home_server;
 709         home->num_received_pings++;
 710
 711         RDEBUG2("Received response to status check %d (%d in current sequence)",
 712                request->number, home->num_received_pings);
 713
 714         /*
 715          *      Remove the request from any hashes
 716          */
 717         fr_event_delete(el, &request->ev);
 718         remove_from_proxy_hash(request);
 719         rad_assert(request->in_request_hash == FALSE);
 720
 721         /*
 722          *      The control socket may have marked the home server as
 723          *      alive.  OR, it may have suddenly started responding to
 724          *      requests again.  If so, don't re-do the "make alive"
 725          *      work.
 726          */
 727         if (home->state == HOME_STATE_ALIVE) return;
 728
 729         /*
 730          *      We haven't received enough ping responses to mark it
 731          *      "alive".  Wait a bit.
 732          */
 733         if (home->num_received_pings < home->num_pings_to_alive) {
 734                 return;
 735         }
 736
 737         home->state = HOME_STATE_ALIVE;
 738         home->currently_outstanding = 0;
 739         home->revive_time = now;
 740
 741         if (!fr_event_delete(el, &home->ev)) {
 742                 RDEBUG2("Hmm... no event for home server.  Oh well.");
 743         }
 744
 745         radlog(L_INFO, "PROXY: Marking home server %s port %d alive",
 746                inet_ntop(request->proxy->dst_ipaddr.af,
 747                          &request->proxy->dst_ipaddr.ipaddr,
 748                          buffer, sizeof(buffer)),
 749                request->proxy->dst_port);
 750 }
 751
 752
 753 /*
 754  *      Called from start of zombie period, OR after control socket
 755  *      marks the home server dead.
 756  */
 757 static void ping_home_server(void *ctx)
 758 {
 759         uint32_t jitter;
 760         home_server *home = ctx;
 761         REQUEST *request;
 762         VALUE_PAIR *vp;
 763
 764         if ((home->state == HOME_STATE_ALIVE) ||
 765             (home->ping_check == HOME_PING_CHECK_NONE)) {
 766                 return;
 767         }
 768
 769         request = request_alloc();
 770         request->number = request_num_counter++;
 771
 772         request->proxy = rad_alloc(1);
 773         rad_assert(request->proxy != NULL);
 774
 775         fr_event_now(el, &request->when);
 776         home->when = request->when;
 777
 778         if (home->ping_check == HOME_PING_CHECK_STATUS_SERVER) {
 779                 request->proxy->code = PW_STATUS_SERVER;
 780
 781                 radius_pairmake(request, &request->proxy->vps,
 782                                 "Message-Authenticator", "0x00", T_OP_SET);
 783
 784         } else if (home->type == HOME_TYPE_AUTH) {
 785                 request->proxy->code = PW_AUTHENTICATION_REQUEST;
 786
 787                 radius_pairmake(request, &request->proxy->vps,
 788                                 "User-Name", home->ping_user_name, T_OP_SET);
 789                 radius_pairmake(request, &request->proxy->vps,
 790                                 "User-Password", home->ping_user_password, T_OP_SET);
 791                 radius_pairmake(request, &request->proxy->vps,
 792                                 "Service-Type", "Authenticate-Only", T_OP_SET);
 793                 radius_pairmake(request, &request->proxy->vps,
 794                                 "Message-Authenticator", "0x00", T_OP_SET);
 795
 796         } else {
 797 #ifdef WITH_ACCOUNTING
 798                 request->proxy->code = PW_ACCOUNTING_REQUEST;
 799
 800                 radius_pairmake(request, &request->proxy->vps,
 801                                 "User-Name", home->ping_user_name, T_OP_SET);
 802                 radius_pairmake(request, &request->proxy->vps,
 803                                 "Acct-Status-Type", "Stop", T_OP_SET);
 804                 radius_pairmake(request, &request->proxy->vps,
 805                                 "Acct-Session-Id", "00000000", T_OP_SET);
 806                 vp = radius_pairmake(request, &request->proxy->vps,
 807                                      "Event-Timestamp", "0", T_OP_SET);
 808                 vp->vp_date = now.tv_sec;
 809 #else
 810                 rad_assert("Internal sanity check failed");
 811 #endif
 812         }
 813
 814         radius_pairmake(request, &request->proxy->vps,
 815                         "NAS-Identifier", "Status Check. Are you alive?",
 816                         T_OP_SET);
 817
 818         request->proxy->dst_ipaddr = home->ipaddr;
 819         request->proxy->dst_port = home->port;
 820         request->home_server = home;
 821
 822         rad_assert(request->proxy_listener == NULL);
 823
 824         if (!insert_into_proxy_hash(request, FALSE)) {
 825                 RDEBUG2("ERROR: Failed inserting status check %d into proxy hash.  Discarding it.",
 826                        request->number);
 827                 ev_request_free(&request);
 828                 return;
 829         }
 830         rad_assert(request->proxy_listener != NULL);
 831         request->proxy_listener->send(request->proxy_listener,
 832                                       request);
 833
 834         request->next_callback = NULL;
 835         request->child_state = REQUEST_PROXIED;
 836         request->when.tv_sec += home->ping_timeout;;
 837
 838         INSERT_EVENT(no_response_to_ping, request);
 839
 840         /*
 841          *      Add +/- 2s of jitter, as suggested in RFC 3539
 842          *      and in the Issues and Fixes draft.
 843          */
 844         home->when.tv_sec += home->ping_interval - 2;
 845
 846         jitter = fr_rand();
 847         jitter ^= (jitter >> 10);
 848         jitter &= ((1 << 23) - 1); /* 22 bits of 1 */
 849
 850         tv_add(&home->when, jitter);
 851
 852         INSERT_EVENT(ping_home_server, home);
 853 }
 854
 855
 856 void mark_home_server_dead(home_server *home, struct timeval *when)
 857 {
 858         int previous_state = home->state;
 859         char buffer[128];
 860
 861         radlog(L_INFO, "PROXY: Marking home server %s port %d as dead.",
 862                inet_ntop(home->ipaddr.af, &home->ipaddr.ipaddr,
 863                          buffer, sizeof(buffer)),
 864                home->port);
 865
 866         home->state = HOME_STATE_IS_DEAD;
 867         home->num_received_pings = 0;
 868
 869         if (home->ping_check != HOME_PING_CHECK_NONE) {
 870                 /*
 871                  *      If the control socket marks us dead, start
 872                  *      pinging.  Otherwise, we already started
 873                  *      pinging when it was marked "zombie".
 874                  */
 875                 if (previous_state == HOME_STATE_ALIVE) {
 876                         ping_home_server(home);
 877                 }
 878
 879         } else {
 880                 /*
 881                  *      Revive it after a fixed period of time.  This
 882                  *      is very, very, bad.
 883                  */
 884                 home->when = *when;
 885                 home->when.tv_sec += home->revive_interval;
 886
 887                 INSERT_EVENT(revive_home_server, home);
 888         }
 889 }
 890
 891 static void check_for_zombie_home_server(REQUEST *request)
 892 {
 893         home_server *home;
 894         struct timeval when;
 895
 896         home = request->home_server;
 897
 898         if (home->state != HOME_STATE_ZOMBIE) return;
 899
 900         when = home->zombie_period_start;
 901         when.tv_sec += home->zombie_period;
 902
 903         fr_event_now(el, &now);
 904         if (timercmp(&now, &when, <)) {
 905                 return;
 906         }
 907
 908         mark_home_server_dead(home, &request->when);
 909 }
 910
 911 static int proxy_to_virtual_server(REQUEST *request);
 912
 913 static int virtual_server_handler(UNUSED REQUEST *request)
 914 {
 915         proxy_to_virtual_server(request);
 916         return 0;
 917 }
 918
 919 static void proxy_fallback_handler(REQUEST *request)
 920 {
 921         /*
 922          *      A proper time is required for wait_a_bit.
 923          */
 924         request->delay = USEC / 10;
 925         gettimeofday(&now, NULL);
 926         request->next_when = now;
 927         tv_add(&request->next_when, request->delay);
 928         request->next_callback = wait_a_bit;
 929
 930         /*
 931          *      Re-queue the request.
 932          */
 933         request->child_state = REQUEST_QUEUED;
 934
 935         rad_assert(request->proxy != NULL);
 936         if (!thread_pool_addrequest(request, virtual_server_handler)) {
 937                 request->child_state = REQUEST_DONE;
 938         }
 939
 940 #ifdef HAVE_PTHREAD_H
 941         /*
 942          *      MAY free the request if we're over max_request_time,
 943          *      AND we're not in threaded mode!
 944          *
 945          *      Note that we call this ONLY if we're threaded, as
 946          *      if we're NOT threaded, request_post_handler() calls
 947          *      wait_a_bit(), which means that "request" may not
 948          *      exist any more...
 949          */
 950         if (have_children) wait_a_bit(request);
 951 #endif
 952 }
 953
 954
 955 static int setup_post_proxy_fail(REQUEST *request)
 956 {
 957         DICT_VALUE *dval = NULL;
 958         VALUE_PAIR *vp;
 959
 960         request->child_state = REQUEST_RUNNING;
 961
 962         if (request->packet->code == PW_AUTHENTICATION_REQUEST) {
 963                 dval = dict_valbyname(PW_POST_PROXY_TYPE, "Fail-Authentication");
 964
 965         } else if (request->packet->code == PW_ACCOUNTING_REQUEST) {
 966                 dval = dict_valbyname(PW_POST_PROXY_TYPE, "Fail-Accounting");
 967
 968 #ifdef WITH_COA
 969                 /*
 970                  *      See no_response_to_coa_request
 971                  */
 972         } else if (((request->packet->code >> 8) & 0xff) == PW_COA_REQUEST) {
 973                 request->packet->code &= 0xff; /* restore it */
 974
 975                 if (request->proxy->code == PW_COA_REQUEST) {
 976                         dval = dict_valbyname(PW_POST_PROXY_TYPE, "Fail-CoA");
 977
 978                 } else if (request->proxy->code == PW_DISCONNECT_REQUEST) {
 979                         dval = dict_valbyname(PW_POST_PROXY_TYPE, "Fail-Disconnect");
 980                 } else {
 981                         return 0;
 982                 }
 983
 984 #endif
 985         } else {
 986                 return 0;
 987         }
 988
 989         if (!dval) dval = dict_valbyname(PW_POST_PROXY_TYPE, "Fail");
 990
 991         if (!dval) {
 992                 pairdelete(&request->config_items, PW_POST_PROXY_TYPE);
 993                 return 0;
 994         }
 995
 996         vp = pairfind(request->config_items, PW_POST_PROXY_TYPE);
 997         if (!vp) vp = radius_paircreate(request, &request->config_items,
 998                                         PW_POST_PROXY_TYPE, PW_TYPE_INTEGER);
 999         vp->vp_integer = dval->value;
1000
1001         rad_assert(request->proxy_reply == NULL);
1002
1003         return 1;
1004 }
1005
1006
1007 static int null_handler(UNUSED REQUEST *request)
1008 {
1009         return 0;
1010 }
1011
1012 static void post_proxy_fail_handler(REQUEST *request)
1013 {
1014         /*
1015          *      A proper time is required for wait_a_bit.
1016          */
1017         request->delay = USEC / 10;
1018         gettimeofday(&now, NULL);
1019
1020         /*
1021          *      Not set up to run Post-Proxy-Type = Fail.
1022          *
1023          *      Mark the request as still running, and figure out what
1024          *      to do next.
1025          */
1026         if (!setup_post_proxy_fail(request)) {
1027                 request_post_handler(request);
1028
1029         } else {
1030                 /*
1031                  *      Re-queue the request.
1032                  */
1033                 request->child_state = REQUEST_QUEUED;
1034
1035                 /*
1036                  *      There is a post-proxy-type of fail.  We run
1037                  *      the request through the pre/post proxy
1038                  *      handlers, just like it was a real proxied
1039                  *      request.  However, we set the per-request
1040                  *      handler to NULL, as we don't want to do
1041                  *      anything else.
1042                  *
1043                  *      Note that when we're not threaded, this will
1044                  *      process the request even if it's greater than
1045                  *      max_request_time.  That's not fatal.
1046                  */
1047                 request->priority = 0;
1048                 rad_assert(request->proxy != NULL);
1049                 thread_pool_addrequest(request, null_handler);
1050         }
1051
1052         /*
1053          *      MAY free the request if we're over max_request_time,
1054          *      AND we're not in threaded mode!
1055          *
1056          *      Note that we call this ONLY if we're threaded, as
1057          *      if we're NOT threaded, request_post_handler() calls
1058          *      wait_a_bit(), which means that "request" may not
1059          *      exist any more...
1060          */
1061         if (have_children) wait_a_bit(request);
1062 }
1063
1064
1065 /* maybe check this against wait_for_proxy_id_to_expire? */
1066 static void no_response_to_proxied_request(void *ctx)
1067 {
1068         REQUEST *request = ctx;
1069         home_server *home;
1070         char buffer[128];
1071
1072         rad_assert(request->magic == REQUEST_MAGIC);
1073         rad_assert(request->child_state == REQUEST_PROXIED);
1074
1075         /*
1076          *      If we've failed over to an internal home server,
1077          *      replace the callback with the correct one.  This
1078          *      is due to locking issues with child threads...
1079          */
1080         if (request->home_server->server) {
1081                 wait_a_bit(request);
1082                 return;
1083         }
1084
1085         check_for_zombie_home_server(request);
1086
1087         home = request->home_server;
1088
1089         /*
1090          *      The default as of 2.1.7 is to allow requests to
1091          *      fail-over to a backup home server when this one does
1092          *      not respond.  The old behavior can be configured as
1093          *      well.
1094          */
1095         if (home->no_response_fail) {
1096                 radlog(L_ERR, "Rejecting request %d due to lack of any response from home server %s port %d",
1097                        request->number,
1098                        inet_ntop(request->proxy->dst_ipaddr.af,
1099                                  &request->proxy->dst_ipaddr.ipaddr,
1100                                  buffer, sizeof(buffer)),
1101                        request->proxy->dst_port);
1102
1103                 post_proxy_fail_handler(request);
1104         }
1105
1106         /*
1107          *      Don't touch request due to race conditions
1108          */
1109         if (home->state == HOME_STATE_IS_DEAD) {
1110                 rad_assert(home->ev != NULL); /* or it will never wake up */
1111                 return;
1112         }
1113
1114         /*
1115          *      Enable the zombie period when we notice that the home
1116          *      server hasn't responded.  We do NOT back-date the start
1117          *      of the zombie period.
1118          */
1119         if (home->state == HOME_STATE_ALIVE) {
1120                 radlog(L_ERR, "PROXY: Marking home server %s port %d as zombie (it looks like it is dead).",
1121                        inet_ntop(home->ipaddr.af, &home->ipaddr.ipaddr,
1122                                  buffer, sizeof(buffer)),
1123                        home->port);
1124                 home->state = HOME_STATE_ZOMBIE;
1125                 home->zombie_period_start = now;
1126
1127                 /*
1128                  *      Start pinging the home server.
1129                  */
1130                 ping_home_server(home);
1131         }
1132 }
1133 #endif
1134
1135 static void wait_a_bit(void *ctx)
1136 {
1137         struct timeval when;
1138         REQUEST *request = ctx;
1139         fr_event_callback_t callback = NULL;
1140
1141         rad_assert(request->magic == REQUEST_MAGIC);
1142
1143 #ifdef WITH_COA
1144         /*
1145          *      The CoA request is a new (internally generated)
1146          *      request, created in a child thread.  We therefore need
1147          *      some way to tie its events back into the main event
1148          *      handler.
1149          */
1150         if (request->coa && !request->coa->proxy_reply &&
1151             request->coa->next_callback) {
1152                 request->coa->when = request->coa->next_when;
1153                 INSERT_EVENT(request->coa->next_callback, request->coa);
1154                 request->coa->next_callback = NULL;
1155                 request->coa->parent = NULL;
1156                 request->coa = NULL;
1157         }
1158 #endif
1159
1160         switch (request->child_state) {
1161         case REQUEST_QUEUED:
1162         case REQUEST_RUNNING:
1163                 when = request->received;
1164                 when.tv_sec += request->root->max_request_time;
1165
1166                 /*
1167                  *      Normally called from the event loop with the
1168                  *      proper event loop time.  Otherwise, called from
1169                  *      post proxy fail handler, which sets "now", and
1170                  *      this call won't re-set it, because we're not
1171                  *      in the event loop.
1172                  */
1173                 fr_event_now(el, &now);
1174
1175                 /*
1176                  *      Request still has more time.  Continue
1177                  *      waiting.
1178                  */
1179                 if (timercmp(&now, &when, <) ||
1180                     ((request->listener->type == RAD_LISTEN_DETAIL) &&
1181                      (request->child_state == REQUEST_QUEUED))) {
1182                         if (request->delay < (USEC / 10)) {
1183                                 request->delay = USEC / 10;
1184                         }
1185                         request->delay += request->delay >> 1;
1186
1187 #ifdef WITH_DETAIL
1188                         /*
1189                          *      Cap wait at some sane value for detail
1190                          *      files.
1191                          */
1192                         if ((request->listener->type == RAD_LISTEN_DETAIL) &&
1193                             (request->delay > (request->root->max_request_time * USEC))) {
1194                                 request->delay = request->root->max_request_time * USEC;
1195                         }
1196 #endif
1197
1198                         request->when = now;
1199                         tv_add(&request->when, request->delay);
1200                         callback = wait_a_bit;
1201                         break;
1202                 }
1203
1204 #if defined(HAVE_PTHREAD_H) || defined(WITH_PROXY)
1205                 /*
1206                  *      A child thread MAY still be running on the
1207                  *      request.  Ask the thread to stop working on
1208                  *      the request.
1209                  */
1210                 if (have_children) {
1211                         /* FIXME: kill unresponsive children? */
1212
1213                         /*
1214                          *      Print this error message ONLY if
1215                          *      there's a child currently processing
1216                          *      the request.  As we don't have thread
1217                          *      locks here, there may be race
1218                          *      conditions on this check.  But it's
1219                          *      just an error message, so that's OK.
1220                          */
1221                         if (!pthread_equal(request->child_pid, NO_SUCH_CHILD_PID)) {
1222                                 radlog(L_ERR, "WARNING: Unresponsive child for request %d, in module %s component %s",
1223                                        request->number,
1224                                        request->module ? request->module : "<server core>",
1225                                        request->component ? request->component : "<server core>");
1226                         }
1227
1228                         request->master_state = REQUEST_STOP_PROCESSING;
1229
1230                         request->delay = USEC / 4;
1231                         tv_add(&request->when, request->delay);
1232                         callback = wait_for_child_to_die;
1233                         break;
1234                 }
1235 #endif
1236
1237                 /*
1238                  *      Else there are no child threads.  We probably
1239                  *      should have just marked the request as 'done'
1240                  *      elsewhere, like in the post-proxy-fail
1241                  *      handler.  But doing that would involve
1242                  *      checking for max_request_time in multiple
1243                  *      places, so this may be simplest.
1244                  */
1245                 request->child_state = REQUEST_DONE;
1246                 /* FALL-THROUGH */
1247
1248                 /*
1249                  *      Mark the request as no longer running,
1250                  *      and clean it up.
1251                  */
1252         case REQUEST_DONE:
1253 #ifdef HAVE_PTHREAD_H
1254                 request->child_pid = NO_SUCH_CHILD_PID;
1255 #endif
1256
1257 #ifdef WTH_COA
1258                 /*
1259                  *      This is a CoA request.  It's been divorced
1260                  *      from everything else, so we clean it up now.
1261                  */
1262                 if (!request->in_request_hash &&
1263                     request->proxy &&
1264                     (request->packet->code != request->proxy->code) &&
1265                     ((request->proxy->code == PW_COA_REQUEST) ||
1266                      (request->proxy->code == PW_DISCONNECT_REQUEST))) {
1267                         /*
1268                          *      FIXME: Do CoA MIBs
1269                          */
1270                         ev_request_free(&request);
1271                         return;
1272                 }
1273 #endif
1274                 request_stats_final(request);
1275                 cleanup_delay(request);
1276                 return;
1277
1278         case REQUEST_REJECT_DELAY:
1279         case REQUEST_CLEANUP_DELAY:
1280 #ifdef HAVE_PTHREAD_H
1281                 request->child_pid = NO_SUCH_CHILD_PID;
1282 #endif
1283                 request_stats_final(request);
1284
1285         case REQUEST_PROXIED:
1286                 rad_assert(request->next_callback != NULL);
1287                 rad_assert(request->next_callback != wait_a_bit);
1288
1289                 request->when = request->next_when;
1290                 callback = request->next_callback;
1291                 request->next_callback = NULL;
1292                 break;
1293
1294         default:
1295                 rad_panic("Internal sanity check failure");
1296                 return;
1297         }
1298
1299         /*
1300          *      Something major went wrong.  Discard the request, and
1301          *      keep running.
1302          *
1303          *      FIXME: No idea why this happens or how to fix it...
1304          *      It seems to happen *only* when requests are proxied,
1305          *      and where the home server doesn't respond.  So it looks
1306          *      like a race condition above, but it happens in debug
1307          *      mode, with no threads...
1308          */
1309         if (!callback) {
1310                 RDEBUG("WARNING: Internal sanity check failed in event handler for request %d: Discarding the request!", request->number);
1311                 ev_request_free(&request);
1312                 return;
1313         }
1314
1315         INSERT_EVENT(callback, request);
1316 }
1317
1318 #ifdef WITH_COA
1319 static void no_response_to_coa_request(void *ctx)
1320 {
1321         REQUEST *request = ctx;
1322         char buffer[128];
1323
1324         rad_assert(request->magic == REQUEST_MAGIC);
1325         rad_assert(request->child_state == REQUEST_PROXIED);
1326         rad_assert(request->home_server != NULL);
1327         rad_assert(!request->in_request_hash);
1328
1329         radlog(L_ERR, "No response to CoA request sent to %s",
1330                inet_ntop(request->proxy->dst_ipaddr.af,
1331                          &request->proxy->dst_ipaddr.ipaddr,
1332                          buffer, sizeof(buffer)));
1333
1334         /*
1335          *      Hack.
1336          */
1337         request->packet->code |= (PW_COA_REQUEST << 8);
1338         post_proxy_fail_handler(request);
1339 }
1340
1341
1342 static int update_event_timestamp(RADIUS_PACKET *packet, time_t when)
1343 {
1344         VALUE_PAIR *vp;
1345
1346         vp = pairfind(packet->vps, PW_EVENT_TIMESTAMP);
1347         if (!vp) return 0;
1348
1349         vp->vp_date = when;
1350
1351         if (packet->data) {
1352                 free(packet->data);
1353                 packet->data = NULL;
1354                 packet->data_len = 0;
1355         }
1356
1357         return 1;               /* time stamp updated */
1358 }
1359
1360
1361 /*
1362  *      Called when we haven't received a response to a CoA request.
1363  */
1364 static void retransmit_coa_request(void *ctx)
1365 {
1366         int delay, frac;
1367         struct timeval mrd;
1368         REQUEST *request = ctx;
1369
1370         rad_assert(request->magic == REQUEST_MAGIC);
1371         rad_assert(request->child_state == REQUEST_PROXIED);
1372         rad_assert(request->home_server != NULL);
1373         rad_assert(!request->in_request_hash);
1374         rad_assert(request->parent == NULL);
1375
1376         fr_event_now(el, &now);
1377
1378         /*
1379          *      Cap count at MRC, if it is non-zero.
1380          */
1381         if (request->home_server->coa_mrc &&
1382             (request->num_coa_requests >= request->home_server->coa_mrc)) {
1383                 no_response_to_coa_request(request);
1384                 return;
1385         }
1386
1387         /*
1388          *      RFC 5080 Section 2.2.1
1389          *
1390          *      RT = 2*RTprev + RAND*RTprev
1391          *         = 1.9 * RTprev + rand(0,.2) * RTprev
1392          *         = 1.9 * RTprev + rand(0,1) * (RTprev / 5)
1393          */
1394         delay = fr_rand();
1395         delay ^= (delay >> 16);
1396         delay &= 0xffff;
1397         frac = request->delay / 5;
1398         delay = ((frac >> 16) * delay) + (((frac & 0xffff) * delay) >> 16);
1399
1400         delay += (2 * request->delay) - (request->delay / 10);
1401
1402         /*
1403          *      Cap delay at MRT, if MRT is non-zero.
1404          */
1405         if (request->home_server->coa_mrt &&
1406             (delay > (request->home_server->coa_mrt * USEC))) {
1407                 int mrt_usec = request->home_server->coa_mrt * USEC;
1408
1409                 /*
1410                  *      delay = MRT + RAND * MRT
1411                  *            = 0.9 MRT + rand(0,.2)  * MRT
1412                  */
1413                 delay = fr_rand();
1414                 delay ^= (delay >> 15);
1415                 delay &= 0x1ffff;
1416                 delay = ((mrt_usec >> 16) * delay) + (((mrt_usec & 0xffff) * delay) >> 16);
1417                 delay += mrt_usec - (mrt_usec / 10);
1418         }
1419
1420         request->delay = delay;
1421         request->when = now;
1422         tv_add(&request->when, request->delay);
1423         mrd = request->proxy_when;
1424         mrd.tv_sec += request->home_server->coa_mrd;
1425
1426         /*
1427          *      Cap duration at MRD.
1428          */
1429         if (timercmp(&mrd, &request->when, <)) {
1430                 request->when = mrd;
1431                 INSERT_EVENT(no_response_to_coa_request, request);
1432
1433         } else {
1434                 INSERT_EVENT(retransmit_coa_request, request);
1435         }
1436
1437         if (update_event_timestamp(request->proxy, now.tv_sec)) {
1438                 if (!insert_into_proxy_hash(request, TRUE)) {
1439                         DEBUG("ERROR: Failed re-inserting CoA request into proxy hash.");
1440                         return;
1441                 }
1442
1443                 request->num_proxied_requests = 0;
1444                 request->num_proxied_responses = 0;
1445         }
1446
1447         request->num_proxied_requests++;
1448         request->num_coa_requests++; /* is NOT reset by code 3 lines above! */
1449
1450         request->proxy_listener->send(request->proxy_listener,
1451                                       request);
1452 }
1453
1454
1455 /*
1456  *      The original request is either DONE, or in CLEANUP_DELAY.
1457  */
1458 static int originated_coa_request(REQUEST *request)
1459 {
1460         int delay, rcode, pre_proxy_type = 0;
1461         VALUE_PAIR *vp;
1462         REQUEST *coa;
1463         fr_ipaddr_t ipaddr;
1464         char buffer[256];
1465
1466         rad_assert(request->proxy == NULL);
1467         rad_assert(!request->in_proxy_hash);
1468         rad_assert(request->proxy_reply == NULL);
1469
1470         vp = pairfind(request->config_items, PW_SEND_COA_REQUEST);
1471         if (!vp && request->coa) vp = pairfind(request->coa->proxy->vps, PW_SEND_COA_REQUEST);
1472         if (vp) {
1473                 if (vp->vp_integer == 0) {
1474                         ev_request_free(&request->coa);
1475                         return 1;       /* success */
1476                 }
1477
1478                 if (!request->coa) request_alloc_coa(request);
1479                 if (!request->coa) return 0;
1480         }
1481
1482         coa = request->coa;
1483
1484         /*
1485          *      src_ipaddr will be set up in proxy_encode.
1486          */
1487         memset(&ipaddr, 0, sizeof(ipaddr));
1488         vp = pairfind(coa->proxy->vps, PW_PACKET_DST_IP_ADDRESS);
1489         if (vp) {
1490                 ipaddr.af = AF_INET;
1491                 ipaddr.ipaddr.ip4addr.s_addr = vp->vp_ipaddr;
1492
1493         } else if ((vp = pairfind(coa->proxy->vps,
1494                                   PW_PACKET_DST_IPV6_ADDRESS)) != NULL) {
1495                 ipaddr.af = AF_INET6;
1496                 ipaddr.ipaddr.ip6addr = vp->vp_ipv6addr;
1497
1498         } else if ((vp = pairfind(coa->proxy->vps,
1499                                   PW_HOME_SERVER_POOL)) != NULL) {
1500                 coa->home_pool = home_pool_byname(vp->vp_strvalue,
1501                                                   HOME_TYPE_COA);
1502                 if (!coa->home_pool) {
1503                         RDEBUG2("WARNING: No such home_server_pool %s",
1504                                vp->vp_strvalue);
1505         fail:
1506                         ev_request_free(&request->coa);
1507                         return 0;
1508                 }
1509
1510                 /*
1511                  *      Prefer
1512                  */
1513         } else if (request->client->coa_pool) {
1514                 coa->home_pool = request->client->coa_pool;
1515
1516         } else if (request->client->coa_server) {
1517                 coa->home_server = request->client->coa_server;
1518
1519         } else {
1520                 /*
1521                  *      If all else fails, send it to the client that
1522                  *      originated this request.
1523                  */
1524                 memcpy(&ipaddr, &request->packet->src_ipaddr, sizeof(ipaddr));
1525         }
1526
1527         /*
1528          *      Use the pool, if it exists.
1529          */
1530         if (coa->home_pool) {
1531                 coa->home_server = home_server_ldb(NULL, coa->home_pool, coa);
1532                 if (!coa->home_server) {
1533                         RDEBUG("WARNING: No live home server for home_server_pool %s", vp->vp_strvalue);
1534                         goto fail;
1535                 }
1536
1537         } else if (!coa->home_server) {
1538                 int port = PW_COA_UDP_PORT;
1539
1540                 vp = pairfind(coa->proxy->vps, PW_PACKET_DST_PORT);
1541                 if (vp) port = vp->vp_integer;
1542
1543                 coa->home_server = home_server_find(&ipaddr, port);
1544                 if (!coa->home_server) {
1545                         RDEBUG2("WARNING: Unknown destination %s:%d for CoA request.",
1546                                inet_ntop(ipaddr.af, &ipaddr.ipaddr,
1547                                          buffer, sizeof(buffer)), port);
1548                         goto fail;
1549                 }
1550         }
1551
1552         vp = pairfind(coa->proxy->vps, PW_PACKET_TYPE);
1553         if (vp) {
1554                 switch (vp->vp_integer) {
1555                 case PW_COA_REQUEST:
1556                 case PW_DISCONNECT_REQUEST:
1557                         coa->proxy->code = vp->vp_integer;
1558                         break;
1559
1560                 default:
1561                         DEBUG("Cannot set CoA Packet-Type to code %d",
1562                               vp->vp_integer);
1563                         goto fail;
1564                 }
1565         }
1566
1567         if (!coa->proxy->code) coa->proxy->code = PW_COA_REQUEST;
1568
1569         /*
1570          *      The rest of the server code assumes that
1571          *      request->packet && request->reply exist.  Copy them
1572          *      from the original request.
1573          */
1574         rad_assert(coa->packet != NULL);
1575         rad_assert(coa->packet->vps == NULL);
1576         memcpy(coa->packet, request->packet, sizeof(*request->packet));
1577         coa->packet->vps = paircopy(request->packet->vps);
1578         coa->packet->data = NULL;
1579         rad_assert(coa->reply != NULL);
1580         rad_assert(coa->reply->vps == NULL);
1581         memcpy(coa->reply, request->reply, sizeof(*request->reply));
1582         coa->reply->vps = paircopy(request->reply->vps);
1583         coa->reply->data = NULL;
1584         coa->config_items = paircopy(request->config_items);
1585
1586         /*
1587          *      Call the pre-proxy routines.
1588          */
1589         vp = pairfind(request->config_items, PW_PRE_PROXY_TYPE);
1590         if (vp) {
1591                 RDEBUG2("  Found Pre-Proxy-Type %s", vp->vp_strvalue);
1592                 pre_proxy_type = vp->vp_integer;
1593         }
1594
1595         if (coa->home_pool && coa->home_pool->virtual_server) {
1596                 const char *old_server = coa->server;
1597
1598                 coa->server = coa->home_pool->virtual_server;
1599                 RDEBUG2(" server %s {", coa->server);
1600                 rcode = module_pre_proxy(pre_proxy_type, coa);
1601                 RDEBUG2(" }");
1602                 coa->server = old_server;
1603         } else {
1604                 rcode = module_pre_proxy(pre_proxy_type, coa);
1605         }
1606         switch (rcode) {
1607         default:
1608                 goto fail;
1609
1610         /*
1611          *      Only send the CoA packet if the pre-proxy code succeeded.
1612          */
1613         case RLM_MODULE_NOOP:
1614         case RLM_MODULE_OK:
1615         case RLM_MODULE_UPDATED:
1616                 break;
1617         }
1618
1619         /*
1620          *      Source IP / port is set when the proxy socket
1621          *      is chosen.
1622          */
1623         coa->proxy->dst_ipaddr = coa->home_server->ipaddr;
1624         coa->proxy->dst_port = coa->home_server->port;
1625
1626         if (!insert_into_proxy_hash(coa, FALSE)) {
1627                 DEBUG("ERROR: Failed inserting CoA request into proxy hash.");
1628                 goto fail;
1629         }
1630
1631         /*
1632          *      We CANNOT divorce the CoA request from the parent
1633          *      request.  This function is running in a child thread,
1634          *      and we need access to the main event loop in order to
1635          *      to add the timers for the CoA packet.  See
1636          *      wait_a_bit().
1637          */
1638
1639         /*
1640          *      Forget about the original request completely at this
1641          *      point.
1642          */
1643         request = coa;
1644
1645         gettimeofday(&request->proxy_when, NULL);
1646         request->received = request->next_when = request->proxy_when;
1647         rad_assert(request->proxy_reply == NULL);
1648
1649         /*
1650          *      Implement re-transmit algorithm as per RFC 5080
1651          *      Section 2.2.1.
1652          *
1653          *      We want IRT + RAND*IRT
1654          *      or 0.9 IRT + rand(0,.2) IRT
1655          *
1656          *      2^20 ~ USEC, and we want 2.
1657          *      rand(0,0.2) USEC ~ (rand(0,2^21) / 10)
1658          */
1659         delay = (fr_rand() & ((1 << 22) - 1)) / 10;
1660         request->delay = delay * request->home_server->coa_irt;
1661         delay = request->home_server->coa_irt * USEC;
1662         delay -= delay / 10;
1663         delay += request->delay;
1664
1665         request->delay = delay;
1666         tv_add(&request->next_when, delay);
1667         request->next_callback = retransmit_coa_request;
1668
1669         /*
1670          *      Note that we set proxied BEFORE sending the packet.
1671          *
1672          *      Once we send it, the request is tainted, as
1673          *      another thread may have picked it up.  Don't
1674          *      touch it!
1675          */
1676         request->num_proxied_requests = 1;
1677         request->num_proxied_responses = 0;
1678         request->child_pid = NO_SUCH_CHILD_PID;
1679
1680         update_event_timestamp(request->proxy, request->proxy_when.tv_sec);
1681
1682         request->child_state = REQUEST_PROXIED;
1683
1684         DEBUG_PACKET(request, request->proxy, 1);
1685
1686         request->proxy_listener->send(request->proxy_listener,
1687                                       request);
1688         return 1;
1689 }
1690 #endif  /* WITH_COA */
1691
1692 #ifdef WITH_PROXY
1693 static int process_proxy_reply(REQUEST *request)
1694 {
1695         int rcode;
1696         int post_proxy_type = 0;
1697         VALUE_PAIR *vp;
1698
1699         /*
1700          *      Delete any reply we had accumulated until now.
1701          */
1702         pairfree(&request->reply->vps);
1703
1704         /*
1705          *      Run the packet through the post-proxy stage,
1706          *      BEFORE playing games with the attributes.
1707          */
1708         vp = pairfind(request->config_items, PW_POST_PROXY_TYPE);
1709         if (vp) {
1710                 RDEBUG2("  Found Post-Proxy-Type %s", vp->vp_strvalue);
1711                 post_proxy_type = vp->vp_integer;
1712         }
1713
1714         if (request->home_pool && request->home_pool->virtual_server) {
1715                 const char *old_server = request->server;
1716
1717                 request->server = request->home_pool->virtual_server;
1718                 RDEBUG2(" server %s {", request->server);
1719                 rcode = module_post_proxy(post_proxy_type, request);
1720                 RDEBUG2(" }");
1721                 request->server = old_server;
1722         } else {
1723                 rcode = module_post_proxy(post_proxy_type, request);
1724         }
1725
1726 #ifdef WITH_COA
1727         if (request->packet->code == request->proxy->code)
1728           /*
1729            *    Don't run the next bit if we originated a CoA
1730            *    packet, after receiving an Access-Request or
1731            *    Accounting-Request.
1732            */
1733 #endif
1734
1735         /*
1736          *      There may NOT be a proxy reply, as we may be
1737          *      running Post-Proxy-Type = Fail.
1738          */
1739         if (request->proxy_reply) {
1740                 /*
1741                  *      Delete the Proxy-State Attributes from
1742                  *      the reply.  These include Proxy-State
1743                  *      attributes from us and remote server.
1744                  */
1745                 pairdelete(&request->proxy_reply->vps, PW_PROXY_STATE);
1746
1747                 /*
1748                  *      Add the attributes left in the proxy
1749                  *      reply to the reply list.
1750                  */
1751                 pairadd(&request->reply->vps, request->proxy_reply->vps);
1752                 request->proxy_reply->vps = NULL;
1753
1754                 /*
1755                  *      Free proxy request pairs.
1756                  */
1757                 pairfree(&request->proxy->vps);
1758         }
1759
1760         switch (rcode) {
1761         default:  /* Don't do anything */
1762                 break;
1763         case RLM_MODULE_FAIL:
1764                 /* FIXME: debug print stuff */
1765                 request->child_state = REQUEST_DONE;
1766                 return 0;
1767
1768         case RLM_MODULE_HANDLED:
1769                 /* FIXME: debug print stuff */
1770                 request->child_state = REQUEST_DONE;
1771                 return 0;
1772         }
1773
1774         return 1;
1775 }
1776 #endif
1777
1778 static int request_pre_handler(REQUEST *request)
1779 {
1780         int rcode;
1781
1782         rad_assert(request->magic == REQUEST_MAGIC);
1783         rad_assert(request->packet != NULL);
1784
1785         request->child_state = REQUEST_RUNNING;
1786
1787         /*
1788          *      Don't decode the packet if it's an internal "fake"
1789          *      request.  Instead, just return so that the caller can
1790          *      process it.
1791          */
1792         if (request->packet->dst_port == 0) {
1793                 request->username = pairfind(request->packet->vps,
1794                                              PW_USER_NAME);
1795                 request->password = pairfind(request->packet->vps,
1796                                              PW_USER_PASSWORD);
1797                 return 1;
1798         }
1799
1800 #ifdef WITH_PROXY
1801         /*
1802          *      Put the decoded packet into it's proper place.
1803          */
1804         if (request->proxy_reply != NULL) {
1805                 rcode = request->proxy_listener->decode(request->proxy_listener,
1806                                                         request);
1807                 DEBUG_PACKET(request, request->proxy_reply, 0);
1808         } else
1809 #endif
1810         if (request->packet->vps == NULL) {
1811                 rcode = request->listener->decode(request->listener, request);
1812
1813                 if (debug_condition) {
1814                         int result = FALSE;
1815                         const char *my_debug = debug_condition;
1816
1817                         /*
1818                          *      Ignore parse errors.
1819                          */
1820                         radius_evaluate_condition(request, RLM_MODULE_OK, 0,
1821                                                   &my_debug, 1,
1822                                                   &result);
1823                         if (result) {
1824                                 request->options = 2;
1825                                 request->radlog = radlog_request;
1826                         }
1827                 }
1828
1829                 DEBUG_PACKET(request, request->packet, 0);
1830         } else {
1831                 rcode = 0;
1832         }
1833
1834         if (rcode < 0) {
1835                 radlog(L_ERR, "%s Dropping packet without response.", fr_strerror());
1836                 request->child_state = REQUEST_DONE;
1837                 return 0;
1838         }
1839
1840         if (!request->username) {
1841                 request->username = pairfind(request->packet->vps,
1842                                              PW_USER_NAME);
1843         }
1844
1845 #ifdef WITH_PROXY
1846         if (request->proxy) {
1847                 return process_proxy_reply(request);
1848 #endif
1849         }
1850
1851         return 1;
1852 }
1853
1854
1855 #ifdef WITH_PROXY
1856 /*
1857  *      Do state handling when we proxy a request.
1858  */
1859 static int proxy_request(REQUEST *request)
1860 {
1861         struct timeval when;
1862         char buffer[128];
1863
1864         if (request->home_server->server) {
1865                 RDEBUG("ERROR: Cannot perform real proxying to a virtual server.");
1866                 return 0;
1867         }
1868
1869         if (!insert_into_proxy_hash(request, FALSE)) {
1870                 RDEBUG("ERROR: Failed inserting request into proxy hash.");
1871                 return 0;
1872         }
1873
1874         request->proxy_listener->encode(request->proxy_listener, request);
1875
1876         when = request->received;
1877         when.tv_sec += request->root->max_request_time;
1878
1879         gettimeofday(&request->proxy_when, NULL);
1880
1881         request->next_when = request->proxy_when;
1882         request->next_when.tv_sec += request->home_server->response_window;
1883
1884         rad_assert(request->home_server->response_window > 0);
1885
1886         if (timercmp(&when, &request->next_when, <)) {
1887                 request->next_when = when;
1888         }
1889         request->next_callback = no_response_to_proxied_request;
1890
1891         RDEBUG2("Proxying request %d to home server %s port %d",
1892                request->number,
1893                inet_ntop(request->proxy->dst_ipaddr.af,
1894                          &request->proxy->dst_ipaddr.ipaddr,
1895                          buffer, sizeof(buffer)),
1896                request->proxy->dst_port);
1897
1898         /*
1899          *      Note that we set proxied BEFORE sending the packet.
1900          *
1901          *      Once we send it, the request is tainted, as
1902          *      another thread may have picked it up.  Don't
1903          *      touch it!
1904          */
1905         request->num_proxied_requests = 1;
1906         request->num_proxied_responses = 0;
1907 #ifdef HAVE_PTHREAD_H
1908         request->child_pid = NO_SUCH_CHILD_PID;
1909 #endif
1910         request->child_state = REQUEST_PROXIED;
1911
1912         DEBUG_PACKET(request, request->proxy, 1);
1913
1914         request->proxy_listener->send(request->proxy_listener,
1915                                       request);
1916         return 1;
1917 }
1918
1919
1920 /*
1921  *      "Proxy" the request by sending it to a new virtual server.
1922  */
1923 static int proxy_to_virtual_server(REQUEST *request)
1924 {
1925         REQUEST *fake;
1926         RAD_REQUEST_FUNP fun;
1927
1928         if (!request->home_server || !request->home_server->server) return 0;
1929
1930         if (request->parent) {
1931                 RDEBUG2("WARNING: Cancelling proxy request to virtual server %s as this request was itself proxied.", request->home_server->server);
1932                 return 0;
1933         }
1934
1935         fake = request_alloc_fake(request);
1936         if (!fake) {
1937                 RDEBUG2("WARNING: Out of memory");
1938                 return 0;
1939         }
1940
1941         fake->packet->vps = paircopy(request->proxy->vps);
1942         fake->server = request->home_server->server;
1943
1944         if (request->proxy->code == PW_AUTHENTICATION_REQUEST) {
1945                 fun = rad_authenticate;
1946
1947 #ifdef WITH_ACCOUNTING
1948         } else if (request->proxy->code == PW_ACCOUNTING_REQUEST) {
1949                 fun = rad_accounting;
1950 #endif
1951
1952         } else {
1953                 RDEBUG2("Unknown packet type %d", request->proxy->code);
1954                 ev_request_free(&fake);
1955                 return 0;
1956         }
1957
1958         RDEBUG2(">>> Sending proxied request internally to virtual server.");
1959         radius_handle_request(fake, fun);
1960         RDEBUG2("<<< Received proxied response code %d from internal virtual server.", fake->reply->code);
1961
1962         if (fake->reply->code != 0) {
1963                 request->proxy_reply = fake->reply;
1964                 fake->reply = NULL;
1965         } else {
1966                 /*
1967                  *      There was no response
1968                  */
1969                 setup_post_proxy_fail(request);
1970         }
1971
1972         ev_request_free(&fake);
1973
1974         process_proxy_reply(request);
1975
1976         /*
1977          *      Process it through the normal section again, but ONLY
1978          *      if we received a proxy reply..
1979          */
1980         if (request->proxy_reply) {
1981                 if (request->server) RDEBUG("server %s {",
1982                                             request->server != NULL ?
1983                                             request->server : "");
1984                 fun(request);
1985
1986                 if (request->server) RDEBUG("} # server %s",
1987                                             request->server != NULL ?
1988                                             request->server : "");
1989         }
1990
1991         return 2;               /* success, but NOT '1' !*/
1992 }
1993
1994 /*
1995  *      Return 1 if we did proxy it, or the proxy attempt failed
1996  *      completely.  Either way, the caller doesn't touch the request
1997  *      any more if we return 1.
1998  */
1999 static int successfully_proxied_request(REQUEST *request)
2000 {
2001         int rcode;
2002         int pre_proxy_type = 0;
2003         VALUE_PAIR *realmpair;
2004         VALUE_PAIR *strippedname;
2005         VALUE_PAIR *vp;
2006         char *realmname = NULL;
2007         home_server *home;
2008         REALM *realm = NULL;
2009         home_pool_t *pool;
2010
2011         /*
2012          *      If it was already proxied, do nothing.
2013          *
2014          *      FIXME: This should really be a serious error.
2015          */
2016         if (request->in_proxy_hash ||
2017             (request->proxy_reply && (request->proxy_reply->code != 0))) {
2018                 return 0;
2019         }
2020
2021         realmpair = pairfind(request->config_items, PW_PROXY_TO_REALM);
2022         if (!realmpair || (realmpair->length == 0)) {
2023                 int pool_type;
2024
2025                 vp = pairfind(request->config_items, PW_HOME_SERVER_POOL);
2026                 if (!vp) return 0;
2027
2028                 switch (request->packet->code) {
2029                 case PW_AUTHENTICATION_REQUEST:
2030                         pool_type = HOME_TYPE_AUTH;
2031                         break;
2032
2033 #ifdef WITH_ACCOUNTING
2034                 case PW_ACCOUNTING_REQUEST:
2035                         pool_type = HOME_TYPE_ACCT;
2036                         break;
2037 #endif
2038
2039 #ifdef WITH_COA
2040                 case PW_COA_REQUEST:
2041                 case PW_DISCONNECT_REQUEST:
2042                         pool_type = HOME_TYPE_COA;
2043                         break;
2044 #endif
2045
2046                 default:
2047                         return 0;
2048                 }
2049
2050                 pool = home_pool_byname(vp->vp_strvalue, pool_type);
2051                 if (!pool) {
2052                         RDEBUG2("ERROR: Cannot proxy to unknown pool %s",
2053                                 vp->vp_strvalue);
2054                         return 0;
2055                 }
2056
2057                 realmname = NULL; /* no realms */
2058                 realm = NULL;
2059                 goto found_pool;
2060         }
2061
2062         realmname = (char *) realmpair->vp_strvalue;
2063
2064         realm = realm_find2(realmname);
2065         if (!realm) {
2066                 RDEBUG2("ERROR: Cannot proxy to unknown realm %s", realmname);
2067                 return 0;
2068         }
2069
2070         /*
2071          *      Figure out which pool to use.
2072          */
2073         if (request->packet->code == PW_AUTHENTICATION_REQUEST) {
2074                 pool = realm->auth_pool;
2075
2076 #ifdef WITH_ACCOUNTING
2077         } else if (request->packet->code == PW_ACCOUNTING_REQUEST) {
2078                 pool = realm->acct_pool;
2079 #endif
2080
2081 #ifdef WITH_COA
2082         } else if ((request->packet->code == PW_COA_REQUEST) ||
2083                    (request->packet->code == PW_DISCONNECT_REQUEST)) {
2084                 pool = realm->acct_pool;
2085 #endif
2086
2087         } else {
2088                 rad_panic("Internal sanity check failed");
2089         }
2090
2091         if (!pool) {
2092                 RDEBUG2(" WARNING: Cancelling proxy to Realm %s, as the realm is local.",
2093                        realmname);
2094                 return 0;
2095         }
2096
2097 found_pool:
2098         home = home_server_ldb(realmname, pool, request);
2099         if (!home) {
2100                 RDEBUG2("ERROR: Failed to find live home server for realm %s",
2101                        realmname);
2102                 return -1;
2103         }
2104         request->home_pool = pool;
2105
2106 #ifdef WITH_COA
2107         /*
2108          *      Once we've decided to proxy a request, we cannot send
2109          *      a CoA packet.  So we free up any CoA packet here.
2110          */
2111         ev_request_free(&request->coa);
2112 #endif
2113         /*
2114          *      Remember that we sent the request to a Realm.
2115          */
2116         if (realmname) pairadd(&request->packet->vps,
2117                                pairmake("Realm", realmname, T_OP_EQ));
2118
2119         /*
2120          *      Strip the name, if told to.
2121          *
2122          *      Doing it here catches the case of proxied tunneled
2123          *      requests.
2124          */
2125         if (realm && (realm->striprealm == TRUE) &&
2126            (strippedname = pairfind(request->proxy->vps, PW_STRIPPED_USER_NAME)) != NULL) {
2127                 /*
2128                  *      If there's a Stripped-User-Name attribute in
2129                  *      the request, then use THAT as the User-Name
2130                  *      for the proxied request, instead of the
2131                  *      original name.
2132                  *
2133                  *      This is done by making a copy of the
2134                  *      Stripped-User-Name attribute, turning it into
2135                  *      a User-Name attribute, deleting the
2136                  *      Stripped-User-Name and User-Name attributes
2137                  *      from the vps list, and making the new
2138                  *      User-Name the head of the vps list.
2139                  */
2140                 vp = pairfind(request->proxy->vps, PW_USER_NAME);
2141                 if (!vp) {
2142                         vp = radius_paircreate(request, NULL,
2143                                                PW_USER_NAME, PW_TYPE_STRING);
2144                         rad_assert(vp != NULL); /* handled by above function */
2145                         /* Insert at the START of the list */
2146                         vp->next = request->proxy->vps;
2147                         request->proxy->vps = vp;
2148                 }
2149                 memcpy(vp->vp_strvalue, strippedname->vp_strvalue,
2150                        sizeof(vp->vp_strvalue));
2151                 vp->length = strippedname->length;
2152
2153                 /*
2154                  *      Do NOT delete Stripped-User-Name.
2155                  */
2156         }
2157
2158         /*
2159          *      If there is no PW_CHAP_CHALLENGE attribute but
2160          *      there is a PW_CHAP_PASSWORD we need to add it
2161          *      since we can't use the request authenticator
2162          *      anymore - we changed it.
2163          */
2164         if ((request->packet->code == PW_AUTHENTICATION_REQUEST) &&
2165             pairfind(request->proxy->vps, PW_CHAP_PASSWORD) &&
2166             pairfind(request->proxy->vps, PW_CHAP_CHALLENGE) == NULL) {
2167                 vp = radius_paircreate(request, &request->proxy->vps,
2168                                        PW_CHAP_CHALLENGE, PW_TYPE_OCTETS);
2169                 vp->length = AUTH_VECTOR_LEN;
2170                 memcpy(vp->vp_strvalue, request->packet->vector, AUTH_VECTOR_LEN);
2171         }
2172
2173         /*
2174          *      The RFC's say we have to do this, but FreeRADIUS
2175          *      doesn't need it.
2176          */
2177         vp = radius_paircreate(request, &request->proxy->vps,
2178                                PW_PROXY_STATE, PW_TYPE_OCTETS);
2179         snprintf(vp->vp_strvalue, sizeof(vp->vp_strvalue), "%d",
2180                  request->packet->id);
2181         vp->length = strlen(vp->vp_strvalue);
2182
2183         /*
2184          *      Should be done BEFORE inserting into proxy hash, as
2185          *      pre-proxy may use this information, or change it.
2186          */
2187         request->proxy->code = request->packet->code;
2188
2189         /*
2190          *      Call the pre-proxy routines.
2191          */
2192         vp = pairfind(request->config_items, PW_PRE_PROXY_TYPE);
2193         if (vp) {
2194                 RDEBUG2("  Found Pre-Proxy-Type %s", vp->vp_strvalue);
2195                 pre_proxy_type = vp->vp_integer;
2196         }
2197
2198         rad_assert(request->home_pool != NULL);
2199
2200         if (request->home_pool->virtual_server) {
2201                 const char *old_server = request->server;
2202
2203                 request->server = request->home_pool->virtual_server;
2204                 RDEBUG2(" server %s {", request->server);
2205                 rcode = module_pre_proxy(pre_proxy_type, request);
2206                 RDEBUG2(" }");
2207                         request->server = old_server;
2208         } else {
2209                 rcode = module_pre_proxy(pre_proxy_type, request);
2210         }
2211         switch (rcode) {
2212         case RLM_MODULE_FAIL:
2213         case RLM_MODULE_INVALID:
2214         case RLM_MODULE_NOTFOUND:
2215         case RLM_MODULE_USERLOCK:
2216         default:
2217                 /* FIXME: debug print failed stuff */
2218                 return -1;
2219
2220         case RLM_MODULE_REJECT:
2221         case RLM_MODULE_HANDLED:
2222                 return 0;
2223
2224         /*
2225          *      Only proxy the packet if the pre-proxy code succeeded.
2226          */
2227         case RLM_MODULE_NOOP:
2228         case RLM_MODULE_OK:
2229         case RLM_MODULE_UPDATED:
2230                 break;
2231         }
2232
2233         /*
2234          *      If it's a fake request, don't send the proxy
2235          *      packet.  The outer tunnel session will take
2236          *      care of doing that.
2237          */
2238         if (request->packet->dst_port == 0) {
2239                 request->home_server = NULL;
2240                 return 1;
2241         }
2242
2243         if (request->home_server->server) {
2244                 return proxy_to_virtual_server(request);
2245         }
2246
2247         if (!proxy_request(request)) {
2248                 RDEBUG("ERROR: Failed to proxy request %d", request->number);
2249                 return -1;
2250         }
2251
2252         return 1;
2253 }
2254 #endif
2255
2256 static void request_post_handler(REQUEST *request)
2257 {
2258         int child_state = -1;
2259         struct timeval when;
2260         VALUE_PAIR *vp;
2261
2262         if ((request->master_state == REQUEST_STOP_PROCESSING) ||
2263             (request->parent &&
2264              (request->parent->master_state == REQUEST_STOP_PROCESSING))) {
2265                 RDEBUG2("Request %d was cancelled.", request->number);
2266 #ifdef HAVE_PTHREAD_H
2267                 request->child_pid = NO_SUCH_CHILD_PID;
2268 #endif
2269                 child_state = REQUEST_DONE;
2270                 goto cleanup;
2271         }
2272
2273         if (request->child_state != REQUEST_RUNNING) {
2274                 rad_panic("Internal sanity check failed");
2275         }
2276
2277 #ifdef WITH_COA
2278         /*
2279          *      If it's not in the request hash, it's a CoA request.
2280          *      We hope.
2281          */
2282         if (!request->in_request_hash &&
2283             request->proxy &&
2284             ((request->proxy->code == PW_COA_REQUEST) ||
2285              (request->proxy->code == PW_DISCONNECT_REQUEST))) {
2286                 request->next_callback = NULL;
2287                 child_state = REQUEST_DONE;
2288                 goto cleanup;
2289         }
2290 #endif
2291
2292         /*
2293          *      Catch Auth-Type := Reject BEFORE proxying the packet.
2294          */
2295         if ((request->packet->code == PW_AUTHENTICATION_REQUEST) &&
2296             (request->reply->code == 0) &&
2297             ((vp = pairfind(request->config_items, PW_AUTH_TYPE)) != NULL) &&
2298             (vp->vp_integer == PW_AUTHTYPE_REJECT)) {
2299                 request->reply->code = PW_AUTHENTICATION_REJECT;
2300         }
2301
2302 #ifdef WITH_PROXY
2303         if (request->root->proxy_requests &&
2304             !request->in_proxy_hash &&
2305             (request->reply->code == 0) &&
2306             (request->packet->dst_port != 0) &&
2307             (request->packet->code != PW_STATUS_SERVER)) {
2308                 int rcode = successfully_proxied_request(request);
2309
2310                 if (rcode == 1) return; /* request is invalid */
2311
2312                 /*
2313                  *      Failed proxying it (dead home servers, etc.)
2314                  *      Run it through Post-Proxy-Type = Fail, and
2315                  *      respond to the request.
2316                  *
2317                  *      Note that we're in a child thread here, so we
2318                  *      do NOT re-schedule the request.  Instead, we
2319                  *      do what we would have done, which is run the
2320                  *      pre-handler, a NULL request handler, and then
2321                  *      the post handler.
2322                  */
2323                 if ((rcode < 0) && setup_post_proxy_fail(request)) {
2324                         request_pre_handler(request);
2325                 }
2326
2327                 /*
2328                  *      Else we weren't supposed to proxy it,
2329                  *      OR we proxied it internally to a virutal server.
2330                  */
2331         }
2332 #endif
2333
2334         /*
2335          *      Fake requests don't get encoded or signed.  The caller
2336          *      also requires the reply VP's, so we don't free them
2337          *      here!
2338          */
2339         if (request->packet->dst_port == 0) {
2340                 /* FIXME: RDEBUG going to the next request */
2341 #ifdef HAVE_PTHREAD_H
2342                 request->child_pid = NO_SUCH_CHILD_PID;
2343 #endif
2344                 request->child_state = REQUEST_DONE;
2345                 return;
2346         }
2347
2348 #ifdef WITH_PROXY
2349         /*
2350          *      Copy Proxy-State from the request to the reply.
2351          */
2352         vp = paircopy2(request->packet->vps, PW_PROXY_STATE);
2353         if (vp) pairadd(&request->reply->vps, vp);
2354 #endif
2355
2356         /*
2357          *      Access-Requests get delayed or cached.
2358          */
2359         switch (request->packet->code) {
2360         case PW_AUTHENTICATION_REQUEST:
2361                 gettimeofday(&request->next_when, NULL);
2362
2363                 if (request->reply->code == 0) {
2364                         /*
2365                          *      Check if the lack of response is intentional.
2366                          */
2367                         vp = pairfind(request->config_items,
2368                                       PW_RESPONSE_PACKET_TYPE);
2369                         if (!vp) {
2370                                 RDEBUG2("There was no response configured: rejecting request %d",
2371                                        request->number);
2372                                 request->reply->code = PW_AUTHENTICATION_REJECT;
2373
2374                         } else if (vp->vp_integer == 256) {
2375                                 RDEBUG2("Not responding to request %d",
2376                                        request->number);
2377
2378                                 /*
2379                                  *      Force cleanup after a long
2380                                  *      time, so that we don't
2381                                  *      re-process the packet.
2382                                  */
2383                                 request->next_when.tv_sec += request->root->max_request_time;
2384                                 request->next_callback = cleanup_delay;
2385                                 child_state = REQUEST_CLEANUP_DELAY;
2386                                 break;
2387                         } else {
2388                                 request->reply->code = vp->vp_integer;
2389
2390                         }
2391                 }
2392
2393                 /*
2394                  *      Run rejected packets through
2395                  *
2396                  *      Post-Auth-Type = Reject
2397                  */
2398                 if (request->reply->code == PW_AUTHENTICATION_REJECT) {
2399                         pairdelete(&request->config_items, PW_POST_AUTH_TYPE);
2400                         vp = radius_pairmake(request, &request->config_items,
2401                                              "Post-Auth-Type", "Reject",
2402                                              T_OP_SET);
2403                         if (vp) rad_postauth(request);
2404
2405                         /*
2406                          *      If configured, delay Access-Reject packets.
2407                          *
2408                          *      If request->root->reject_delay = 0, we discover
2409                          *      that we have to send the packet now.
2410                          */
2411                         when = request->received;
2412                         when.tv_sec += request->root->reject_delay;
2413
2414                         if (timercmp(&when, &request->next_when, >)) {
2415                                 RDEBUG2("Delaying reject of request %d for %d seconds",
2416                                        request->number,
2417                                        request->root->reject_delay);
2418                                 request->next_when = when;
2419                                 request->next_callback = reject_delay;
2420 #ifdef HAVE_PTHREAD_H
2421                                 request->child_pid = NO_SUCH_CHILD_PID;
2422 #endif
2423                                 request->child_state = REQUEST_REJECT_DELAY;
2424                                 return;
2425                         }
2426                 }
2427
2428 #ifdef WITH_COA
2429         case PW_COA_REQUEST:
2430         case PW_DISCONNECT_REQUEST:
2431 #endif
2432                 request->next_when.tv_sec += request->root->cleanup_delay;
2433                 request->next_callback = cleanup_delay;
2434                 child_state = REQUEST_CLEANUP_DELAY;
2435                 break;
2436
2437         case PW_ACCOUNTING_REQUEST:
2438                 request->next_callback = NULL; /* just to be safe */
2439                 child_state = REQUEST_DONE;
2440                 break;
2441
2442                 /*
2443                  *      FIXME: Status-Server should probably not be
2444                  *      handled here...
2445                  */
2446         case PW_STATUS_SERVER:
2447                 request->next_callback = NULL;
2448                 child_state = REQUEST_DONE;
2449                 break;
2450
2451         default:
2452                 /*
2453                  *      DHCP, VMPS, etc.
2454                  */
2455                 request->next_callback = NULL;
2456                 child_state = REQUEST_DONE;
2457                 break;
2458         }
2459
2460         /*
2461          *      Suppress "no reply" packets here, unless we're reading
2462          *      from the "detail" file.  In that case, we've got to
2463          *      tell the detail file handler that the request is dead,
2464          *      and it should re-send it.
2465          *      If configured, encode, sign, and send.
2466          */
2467         if ((request->reply->code != 0) ||
2468             (request->listener->type == RAD_LISTEN_DETAIL)) {
2469                 DEBUG_PACKET(request, request->reply, 1);
2470                 request->listener->send(request->listener, request);
2471         }
2472
2473 #ifdef WITH_COA
2474         /*
2475          *      Now that we've completely processed the request,
2476          *      see if we need to originate a CoA request.
2477          */
2478         if (request->coa ||
2479             (pairfind(request->config_items, PW_SEND_COA_REQUEST) != NULL)) {
2480                 if (!originated_coa_request(request)) {
2481                         RDEBUG2("Do CoA Fail handler here");
2482                 }
2483                 /* request->coa is stil set, so we can update events */
2484         }
2485 #endif
2486
2487  cleanup:
2488         /*
2489          *      Clean up.  These are no longer needed.
2490          */
2491         pairfree(&request->config_items);
2492
2493         pairfree(&request->packet->vps);
2494         request->username = NULL;
2495         request->password = NULL;
2496
2497         pairfree(&request->reply->vps);
2498
2499 #ifdef WITH_PROXY
2500         if (request->proxy) {
2501                 pairfree(&request->proxy->vps);
2502
2503                 if (request->proxy_reply) {
2504                         pairfree(&request->proxy_reply->vps);
2505                 }
2506
2507 #if 0
2508                 /*
2509                  *      We're not tracking responses from the home
2510                  *      server, we can therefore free this memory in
2511                  *      the child thread.
2512                  */
2513                 if (!request->in_proxy_hash) {
2514                         rad_free(&request->proxy);
2515                         rad_free(&request->proxy_reply);
2516                         request->home_server = NULL;
2517                 }
2518 #endif
2519         }
2520 #endif
2521
2522         RDEBUG2("Finished request %d.", request->number);
2523         rad_assert(child_state >= 0);
2524         request->child_state = child_state;
2525
2526         /*
2527          *      Single threaded mode: update timers now.
2528          */
2529         if (!have_children) wait_a_bit(request);
2530 }
2531
2532
2533 static void received_retransmit(REQUEST *request, const RADCLIENT *client)
2534 {
2535 #ifdef WITH_PROXY
2536         char buffer[128];
2537 #endif
2538
2539         RAD_STATS_TYPE_INC(request->listener, total_dup_requests);
2540         RAD_STATS_CLIENT_INC(request->listener, client, total_dup_requests);
2541
2542         switch (request->child_state) {
2543         case REQUEST_QUEUED:
2544         case REQUEST_RUNNING:
2545 #ifdef WITH_PROXY
2546         discard:
2547 #endif
2548                 radlog(L_ERR, "Discarding duplicate request from "
2549                        "client %s port %d - ID: %d due to unfinished request %d",
2550                        client->shortname,
2551                        request->packet->src_port,request->packet->id,
2552                        request->number);
2553                 break;
2554
2555 #ifdef WITH_PROXY
2556         case REQUEST_PROXIED:
2557                 /*
2558                  *      We're not supposed to have duplicate
2559                  *      accounting packets.  The other states handle
2560                  *      duplicates fine (discard, or send duplicate
2561                  *      reply).  But we do NOT want to retransmit an
2562                  *      accounting request here, because that would
2563                  *      involve updating the Acct-Delay-Time, and
2564                  *      therefore changing the packet Id, etc.
2565                  *
2566                  *      Instead, we just discard the packet.  We may
2567                  *      eventually respond, or the client will send a
2568                  *      new accounting packet.
2569                  *
2570                  *      The same comments go for Status-Server, and
2571                  *      other packet types.
2572                  *
2573                  *      FIXME: coa: when we proxy CoA && Disconnect
2574                  *      packets, this logic has to be fixed.
2575                  */
2576                 if (request->packet->code != PW_AUTHENTICATION_REQUEST) {
2577                         goto discard;
2578                 }
2579
2580                 check_for_zombie_home_server(request);
2581
2582                 /*
2583                  *      If we've just discovered that the home server is
2584                  *      dead, send the packet to another one.
2585                  */
2586                 if ((request->packet->dst_port != 0) &&
2587                     (request->home_server->state == HOME_STATE_IS_DEAD)) {
2588                         home_server *home;
2589
2590                         remove_from_proxy_hash(request);
2591
2592                         home = home_server_ldb(NULL, request->home_pool, request);
2593                         if (!home) {
2594                                 RDEBUG2("Failed to find live home server for request %d", request->number);
2595                         no_home_servers:
2596                                 /*
2597                                  *      Do post-request processing,
2598                                  *      and any insertion of necessary
2599                                  *      events.
2600                                  */
2601                                 post_proxy_fail_handler(request);
2602                                 return;
2603                         }
2604
2605                         request->proxy->code = request->packet->code;
2606
2607                         /*
2608                          *      Free the old packet, to force re-encoding
2609                          */
2610                         free(request->proxy->data);
2611                         request->proxy->data = NULL;
2612                         request->proxy->data_len = 0;
2613
2614                         /*
2615                          *      This request failed over to a virtual
2616                          *      server.  Push it back onto the queue
2617                          *      to be processed.
2618                          */
2619                         if (request->home_server->server) {
2620                                 proxy_fallback_handler(request);
2621                                 return;
2622                         }
2623
2624                         /*
2625                          *      Try to proxy the request.
2626                          */
2627                         if (!proxy_request(request)) {
2628                                 RDEBUG("ERROR: Failed to re-proxy request %d", request->number);
2629                                 goto no_home_servers;
2630                         }
2631
2632                         /*
2633                          *      This code executes in the main server
2634                          *      thread, so there's no need for locking.
2635                          */
2636                         rad_assert(request->next_callback != NULL);
2637                         INSERT_EVENT(request->next_callback, request);
2638                         request->next_callback = NULL;
2639                         return;
2640                 } /* else the home server is still alive */
2641
2642                 RDEBUG2("Sending duplicate proxied request to home server %s port %d - ID: %d",
2643                        inet_ntop(request->proxy->dst_ipaddr.af,
2644                                  &request->proxy->dst_ipaddr.ipaddr,
2645                                  buffer, sizeof(buffer)),
2646                        request->proxy->dst_port,
2647                        request->proxy->id);
2648                 request->num_proxied_requests++;
2649
2650                 DEBUG_PACKET(request, request->proxy, 1);
2651                 request->proxy_listener->send(request->proxy_listener,
2652                                               request);
2653                 break;
2654 #endif
2655
2656         case REQUEST_REJECT_DELAY:
2657                 RDEBUG2("Waiting to send Access-Reject "
2658                        "to client %s port %d - ID: %d",
2659                        client->shortname,
2660                        request->packet->src_port, request->packet->id);
2661                 break;
2662
2663         case REQUEST_CLEANUP_DELAY:
2664         case REQUEST_DONE:
2665                 if (request->reply->code == 0) {
2666                         RDEBUG2("Ignoring retransmit from client %s port %d "
2667                                 "- ID: %d, no reply was configured",
2668                                 client->shortname,
2669                                 request->packet->src_port, request->packet->id);
2670                         return;
2671                 }
2672
2673                 /*
2674                  *      FIXME: This sends duplicate replies to
2675                  *      accounting requests, even if Acct-Delay-Time
2676                  *      or Event-Timestamp is in the packet.  In those
2677                  *      cases, the Id should be changed, and the packet
2678                  *      re-calculated.
2679                  */
2680                 RDEBUG2("Sending duplicate reply "
2681                        "to client %s port %d - ID: %d",
2682                        client->shortname,
2683                        request->packet->src_port, request->packet->id);
2684                 DEBUG_PACKET(request, request->reply, 1);
2685                 request->listener->send(request->listener, request);
2686                 break;
2687         }
2688 }
2689
2690
2691 static void received_conflicting_request(REQUEST *request,
2692                                          const RADCLIENT *client)
2693 {
2694         radlog(L_ERR, "Received conflicting packet from "
2695                "client %s port %d - ID: %d due to unfinished request %d.  Giving up on old request.",
2696                client->shortname,
2697                request->packet->src_port, request->packet->id,
2698                request->number);
2699
2700         /*
2701          *      Nuke it from the request hash, so we can receive new
2702          *      packets.
2703          */
2704         remove_from_request_hash(request);
2705
2706         switch (request->child_state) {
2707 #ifdef HAVE_PTHREAD_H
2708                 /*
2709                  *      It's queued or running.  Tell it to stop, and
2710                  *      wait for it to do so.
2711                  */
2712         case REQUEST_QUEUED:
2713         case REQUEST_RUNNING:
2714                 request->master_state = REQUEST_STOP_PROCESSING;
2715                 request->delay += request->delay >> 1;
2716
2717                 tv_add(&request->when, request->delay);
2718
2719                 INSERT_EVENT(wait_for_child_to_die, request);
2720                 return;
2721 #endif
2722
2723                 /*
2724                  *      Catch race conditions.  It may have switched
2725                  *      from running to done while this code is being
2726                  *      executed.
2727                  */
2728         case REQUEST_REJECT_DELAY:
2729         case REQUEST_CLEANUP_DELAY:
2730         case REQUEST_DONE:
2731                 break;
2732
2733                 /*
2734                  *      It's in some other state, and therefore also
2735                  *      in the event queue.  At some point, the
2736                  *      child will notice, and we can then delete it.
2737                  */
2738         case REQUEST_PROXIED:
2739         default:
2740                 rad_assert(request->ev != NULL);
2741                 break;
2742         }
2743 }
2744
2745
2746 static int can_handle_new_request(RADIUS_PACKET *packet,
2747                                   RADCLIENT *client,
2748                                   struct main_config_t *root)
2749 {
2750         /*
2751          *      Count the total number of requests, to see if
2752          *      there are too many.  If so, return with an
2753          *      error.
2754          */
2755         if (root->max_requests) {
2756                 int request_count = fr_packet_list_num_elements(pl);
2757
2758                 /*
2759                  *      This is a new request.  Let's see if
2760                  *      it makes us go over our configured
2761                  *      bounds.
2762                  */
2763                 if (request_count > root->max_requests) {
2764                         radlog(L_ERR, "Dropping request (%d is too many): "
2765                                "from client %s port %d - ID: %d", request_count,
2766                                client->shortname,
2767                                packet->src_port, packet->id);
2768                         radlog(L_INFO, "WARNING: Please check the configuration file.\n"
2769                                "\tThe value for 'max_requests' is probably set too low.\n");
2770                         return 0;
2771                 } /* else there were a small number of requests */
2772         } /* else there was no configured limit for requests */
2773
2774         /*
2775          *      FIXME: Add per-client checks.  If one client is sending
2776          *      too many packets, start discarding them.
2777          *
2778          *      We increment the counters here, and decrement them
2779          *      when the response is sent... somewhere in this file.
2780          */
2781
2782         /*
2783          *      FUTURE: Add checks for system load.  If the system is
2784          *      busy, start dropping requests...
2785          *
2786          *      We can probably keep some statistics ourselves...  if
2787          *      there are more requests coming in than we can handle,
2788          *      start dropping some.
2789          */
2790
2791         return 1;
2792 }
2793
2794
2795 int received_request(rad_listen_t *listener,
2796                      RADIUS_PACKET *packet, REQUEST **prequest,
2797                      RADCLIENT *client)
2798 {
2799         RADIUS_PACKET **packet_p;
2800         REQUEST *request = NULL;
2801         struct main_config_t *root = &mainconfig;
2802
2803         packet_p = fr_packet_list_find(pl, packet);
2804         if (packet_p) {
2805                 request = fr_packet2myptr(REQUEST, packet, packet_p);
2806                 rad_assert(request->in_request_hash);
2807
2808                 if ((request->packet->data_len == packet->data_len) &&
2809                     (memcmp(request->packet->vector, packet->vector,
2810                             sizeof(packet->vector)) == 0)) {
2811                         received_retransmit(request, client);
2812                         return 0;
2813                 }
2814
2815                 /*
2816                  *      The new request is different from the old one,
2817                  *      but maybe the old is finished.  If so, delete
2818                  *      the old one.
2819                  */
2820                 switch (request->child_state) {
2821                         struct timeval when;
2822
2823                 default:
2824                         /*
2825                          *      Special hacks for race conditions.
2826                          *      The reply is encoded, and therefore
2827                          *      likely sent.  We received a *new*
2828                          *      packet from the client, likely before
2829                          *      the next line or two of code which
2830                          *      updated the child state.  In this
2831                          *      case, just accept the new request.
2832                          */
2833                         if ((request->reply->code != 0) &&
2834                             request->reply->data) {
2835                                 radlog(L_INFO, "WARNING: Allowing fast client %s port %d - ID: %d for recent request %d.",
2836                                        client->shortname,
2837                                        packet->src_port, packet->id,
2838                                        request->number);
2839                                 remove_from_request_hash(request);
2840                                 request = NULL;
2841                                 break;
2842                         }
2843
2844                         gettimeofday(&when, NULL);
2845                         when.tv_sec -= 1;
2846
2847                         /*
2848                          *      If the cached request was received
2849                          *      within the last second, then we
2850                          *      discard the NEW request instead of the
2851                          *      old one.  This will happen ONLY when
2852                          *      the client is severely broken, and is
2853                          *      sending conflicting packets very
2854                          *      quickly.
2855                          */
2856                         if (timercmp(&when, &request->received, <)) {
2857                                 radlog(L_ERR, "Discarding conflicting packet from "
2858                                        "client %s port %d - ID: %d due to recent request %d.",
2859                                        client->shortname,
2860                                        packet->src_port, packet->id,
2861                                        request->number);
2862                                 return 0;
2863                         }
2864
2865                         received_conflicting_request(request, client);
2866                         request = NULL;
2867                         break;
2868
2869                 case REQUEST_REJECT_DELAY:
2870                 case REQUEST_CLEANUP_DELAY:
2871                         request->child_state = REQUEST_DONE;
2872                 case REQUEST_DONE:
2873                         cleanup_delay(request);
2874                         request = NULL;
2875                         break;
2876                 }
2877         }
2878
2879         /*
2880          *      We may want to quench the new request.
2881          */
2882         if ((listener->type != RAD_LISTEN_DETAIL) &&
2883             !can_handle_new_request(packet, client, root)) {
2884                 return 0;
2885         }
2886
2887         /*
2888          *      Create and initialize the new request.
2889          */
2890         request = request_alloc(); /* never fails */
2891
2892         if ((request->reply = rad_alloc(0)) == NULL) {
2893                 radlog(L_ERR, "No memory");
2894                 exit(1);
2895         }
2896
2897         request->listener = listener;
2898         request->client = client;
2899         request->packet = packet;
2900         request->packet->timestamp = request->timestamp;
2901         request->number = request_num_counter++;
2902         request->priority = listener->type;
2903 #ifdef HAVE_PTHREAD_H
2904         request->child_pid = NO_SUCH_CHILD_PID;
2905 #endif
2906
2907         /*
2908          *      Status-Server packets go to the head of the queue.
2909          */
2910         if (request->packet->code == PW_STATUS_SERVER) request->priority = 0;
2911
2912         /*
2913          *      Set virtual server identity
2914          */
2915         if (client->server) {
2916                 request->server = client->server;
2917         } else if (listener->server) {
2918                 request->server = listener->server;
2919         } else {
2920                 request->server = NULL;
2921         }
2922
2923         /*
2924          *      Remember the request in the list.
2925          */
2926         if (!fr_packet_list_insert(pl, &request->packet)) {
2927                 radlog(L_ERR, "Failed to insert request %d in the list of live requests: discarding", request->number);
2928                 ev_request_free(&request);
2929                 return 0;
2930         }
2931
2932         request->in_request_hash = TRUE;
2933         request->root = root;
2934         root->refcount++;
2935
2936         /*
2937          *      The request passes many of our sanity checks.
2938          *      From here on in, if anything goes wrong, we
2939          *      send a reject message, instead of dropping the
2940          *      packet.
2941          */
2942
2943         /*
2944          *      Build the reply template from the request.
2945          */
2946
2947         request->reply->sockfd = request->packet->sockfd;
2948         request->reply->dst_ipaddr = request->packet->src_ipaddr;
2949         request->reply->src_ipaddr = request->packet->dst_ipaddr;
2950         request->reply->dst_port = request->packet->src_port;
2951         request->reply->src_port = request->packet->dst_port;
2952         request->reply->id = request->packet->id;
2953         request->reply->code = 0; /* UNKNOWN code */
2954         memcpy(request->reply->vector, request->packet->vector,
2955                sizeof(request->reply->vector));
2956         request->reply->vps = NULL;
2957         request->reply->data = NULL;
2958         request->reply->data_len = 0;
2959
2960         request->master_state = REQUEST_ACTIVE;
2961         request->child_state = REQUEST_QUEUED;
2962         request->next_callback = NULL;
2963
2964         gettimeofday(&request->received, NULL);
2965         request->timestamp = request->received.tv_sec;
2966         request->when = request->received;
2967
2968         request->delay = USEC;
2969
2970         tv_add(&request->when, request->delay);
2971
2972         INSERT_EVENT(wait_a_bit, request);
2973
2974         *prequest = request;
2975         return 1;
2976 }
2977
2978
2979 #ifdef WITH_PROXY
2980 REQUEST *received_proxy_response(RADIUS_PACKET *packet)
2981 {
2982         char            buffer[128];
2983         REQUEST         *request;
2984
2985         /*
2986          *      Also removes from the proxy hash if responses == requests
2987          */
2988         request = lookup_in_proxy_hash(packet);
2989
2990         if (!request) {
2991                 radlog(L_PROXY, "No outstanding request was found for reply from host %s port %d - ID %d",
2992                        inet_ntop(packet->src_ipaddr.af,
2993                                  &packet->src_ipaddr.ipaddr,
2994                                  buffer, sizeof(buffer)),
2995                        packet->src_port, packet->id);
2996                 return NULL;
2997         }
2998
2999         /*
3000          *      We haven't replied to the NAS, but we have seen an
3001          *      earlier reply from the home server.  Ignore this packet,
3002          *      as we're likely still processing the previous reply.
3003          */
3004         if (request->proxy_reply) {
3005                 if (memcmp(request->proxy_reply->vector,
3006                            packet->vector,
3007                            sizeof(request->proxy_reply->vector)) == 0) {
3008                         RDEBUG2("Discarding duplicate reply from host %s port %d  - ID: %d for request %d",
3009                                inet_ntop(packet->src_ipaddr.af,
3010                                          &packet->src_ipaddr.ipaddr,
3011                                          buffer, sizeof(buffer)),
3012                                packet->src_port, packet->id,
3013                                request->number);
3014                 } else {
3015                         /*
3016                          *      ? The home server gave us a new proxy
3017                          *      reply which doesn't match the old
3018                          *      one.  Delete it.
3019                          */
3020                         RDEBUG2("Ignoring conflicting proxy reply");
3021                 }
3022
3023                 /* assert that there's an event queued for request? */
3024                 return NULL;
3025         }
3026
3027         /*
3028          *      Verify the packet before doing ANYTHING with it.  This
3029          *      means we're doing more MD5 checks in the server core.
3030          *      However, we can fix that by moving to multiple threads
3031          *      listening on sockets.
3032          *
3033          *      We do this AFTER looking the request up in the hash,
3034          *      and AFTER vhecking if we saw a previous request.  This
3035          *      helps minimize the DoS effect of people attacking us
3036          *      with spoofed packets.
3037          */
3038         if (rad_verify(packet, request->proxy,
3039                        request->home_server->secret) != 0) {
3040                 DEBUG("Ignoring spoofed proxy reply.  Signature is invalid");
3041                 return NULL;
3042         }
3043
3044         gettimeofday(&now, NULL);
3045
3046         /*
3047          *      Maybe move this earlier in the decision process?
3048          *      Having it here means that late or duplicate proxy
3049          *      replies no longer get the home server marked as
3050          *      "alive".  This might be good for stability, though.
3051          *
3052          *      FIXME: Do we really want to do this whenever we
3053          *      receive a packet?  Setting this here means that we
3054          *      mark it alive on *any* packet, even if it's lost all
3055          *      of the *other* packets in the last 10s.
3056          */
3057         request->home_server->state = HOME_STATE_ALIVE;
3058
3059 #ifdef WITH_COA
3060         /*
3061          *      When originating CoA, the "proxy" reply is the reply
3062          *      to the CoA request that we originated.  At this point,
3063          *      the original request is finished, and it has a reply.
3064          *
3065          *      However, if we haven't separated the two requests, do
3066          *      so now.  This is done so that cleaning up the original
3067          *      request won't cause the CoA request to be free'd.  See
3068          *      util.c, request_free()
3069          */
3070         if (request->parent && (request->parent->coa == request)) {
3071                 request->parent->coa = NULL;
3072                 request->parent = NULL;
3073
3074         } else
3075                 /*
3076                  *      Skip the next set of checks, as the original
3077                  *      reply is cached.  We want to be able to still
3078                  *      process the CoA reply, AND to reference the
3079                  *      original request/reply.
3080                  *
3081                  *      This is getting to be really quite a bit of a
3082                  *      hack.
3083                  */
3084 #endif
3085
3086         /*
3087          *      If there's a reply to the NAS, ignore everything
3088          *      related to proxy responses
3089          */
3090         if (request->reply && request->reply->code != 0) {
3091                 RDEBUG2("Ignoring proxy reply that arrived after we sent a reply to the NAS");
3092                 return NULL;
3093         }
3094
3095 #ifdef WITH_STATS
3096         /*
3097          *      The average includes our time to receive packets and
3098          *      look them up in the hashes, which should be the same
3099          *      for all packets.
3100          *
3101          *      We update the response time only for the FIRST packet
3102          *      we receive.
3103          */
3104         if (request->home_server->ema.window > 0) {
3105                 radius_stats_ema(&request->home_server->ema,
3106                                  &now, &request->proxy_when);
3107         }
3108 #endif
3109
3110         switch (request->child_state) {
3111         case REQUEST_QUEUED:
3112         case REQUEST_RUNNING:
3113                 radlog(L_ERR, "Internal sanity check failed for child state");
3114                 /* FALL-THROUGH */
3115
3116         case REQUEST_REJECT_DELAY:
3117         case REQUEST_CLEANUP_DELAY:
3118         case REQUEST_DONE:
3119                 radlog(L_ERR, "Reply from home server %s port %d  - ID: %d arrived too late for request %d. Try increasing 'retry_delay' or 'max_request_time'",
3120                        inet_ntop(packet->src_ipaddr.af,
3121                                  &packet->src_ipaddr.ipaddr,
3122                                  buffer, sizeof(buffer)),
3123                        packet->src_port, packet->id,
3124                        request->number);
3125                 /* assert that there's an event queued for request? */
3126                 return NULL;
3127
3128         case REQUEST_PROXIED:
3129                 break;
3130         }
3131
3132         request->proxy_reply = packet;
3133
3134 #if 0
3135         /*
3136          *      Perform RTT calculations, as per RFC 2988 (for TCP).
3137          *      Note that we only do so on the first response.
3138          */
3139         if ((request->num_proxied_responses == 1)
3140                 int rtt;
3141                 home_server *home = request->home_server;
3142
3143                 rtt = now.tv_sec - request->proxy_when.tv_sec;
3144                 rtt *= USEC;
3145                 rtt += now.tv_usec;
3146                 rtt -= request->proxy_when.tv_usec;
3147
3148                 if (!home->has_rtt) {
3149                         home->has_rtt = TRUE;
3150
3151                         home->srtt = rtt;
3152                         home->rttvar = rtt / 2;
3153
3154                 } else {
3155                         home->rttvar -= home->rttvar >> 2;
3156                         home->rttvar += (home->srtt - rtt);
3157                         home->srtt -= home->srtt >> 3;
3158                         home->srtt += rtt >> 3;
3159                 }
3160
3161                 home->rto = home->srtt;
3162                 if (home->rttvar > (USEC / 4)) {
3163                         home->rto += home->rttvar * 4;
3164                 } else {
3165                         home->rto += USEC;
3166                 }
3167         }
3168 #endif
3169
3170         /*
3171          *      There's no incoming request, so it's a proxied packet
3172          *      we originated.
3173          */
3174         if (!request->packet) {
3175                 received_response_to_ping(request);
3176                 request->proxy_reply = NULL; /* caller will free it */
3177                 ev_request_free(&request);
3178                 return NULL;
3179         }
3180
3181         request->child_state = REQUEST_QUEUED;
3182         request->when = now;
3183         request->delay = USEC;
3184         request->priority = RAD_LISTEN_PROXY;
3185         tv_add(&request->when, request->delay);
3186
3187         /*
3188          *      Wait a bit will take care of max_request_time
3189          */
3190         INSERT_EVENT(wait_a_bit, request);
3191
3192         return request;
3193 }
3194 #endif
3195
3196 void event_new_fd(rad_listen_t *this)
3197 {
3198         char buffer[1024];
3199
3200         if (this->status == RAD_LISTEN_STATUS_KNOWN) return;
3201
3202         this->print(this, buffer, sizeof(buffer));
3203
3204         if (this->status == RAD_LISTEN_STATUS_INIT) {
3205                 if (just_started) {
3206                         DEBUG("Listening on %s", buffer);
3207                 } else {
3208                         DEBUG2(" ... adding new socket %s", buffer);
3209                 }
3210                 if (!fr_event_fd_insert(el, 0, this->fd,
3211                                         event_socket_handler, this)) {
3212                         radlog(L_ERR, "Failed remembering handle for proxy socket!");
3213                         exit(1);
3214                 }
3215
3216                 this->status = RAD_LISTEN_STATUS_KNOWN;
3217                 return;
3218         }
3219
3220         if (this->status == RAD_LISTEN_STATUS_CLOSED) {
3221                 DEBUG2(" ... closing socket %s", buffer);
3222
3223                 fr_event_fd_delete(el, 0, this->fd);
3224                 this->status = RAD_LISTEN_STATUS_FINISH;
3225
3226                 /*
3227                  *      Close the fd AFTER fixing up the requests and
3228                  *      listeners, so that they don't send/recv on the
3229                  *      wrong socket (if someone manages to open
3230                  *      another one).
3231                  */
3232                 close(this->fd);
3233                 this->fd = -1;
3234         }
3235 }
3236
3237 static void handle_signal_self(int flag)
3238 {
3239         if ((flag & (RADIUS_SIGNAL_SELF_EXIT | RADIUS_SIGNAL_SELF_TERM)) != 0) {
3240                 if ((flag & RADIUS_SIGNAL_SELF_EXIT) != 0) {
3241                         fr_event_loop_exit(el, 1);
3242                 } else {
3243                         fr_event_loop_exit(el, 2);
3244                 }
3245
3246                 return;
3247         } /* else exit/term flags weren't set */
3248
3249         /*
3250          *      Tell the even loop to stop processing.
3251          */
3252         if ((flag & RADIUS_SIGNAL_SELF_HUP) != 0) {
3253                 time_t when;
3254                 static time_t last_hup = 0;
3255
3256                 DEBUG("Received HUP signal.");
3257
3258                 when = time(NULL);
3259                 if ((int) (when - last_hup) < 5) {
3260                         radlog(L_INFO, "Ignoring HUP (less than 5s since last one)");
3261                         return;
3262                 }
3263                 last_hup = when;
3264
3265                 fr_event_loop_exit(el, 0x80);
3266         }
3267
3268 #ifdef WITH_DETAIL
3269         if ((flag & RADIUS_SIGNAL_SELF_DETAIL) != 0) {
3270                 rad_listen_t *this;
3271
3272                 /*
3273                  *      FIXME: O(N) loops suck.
3274                  */
3275                 for (this = mainconfig.listen;
3276                      this != NULL;
3277                      this = this->next) {
3278                         if (this->type != RAD_LISTEN_DETAIL) continue;
3279
3280                         /*
3281                          *      This one didn't send the signal, skip
3282                          *      it.
3283                          */
3284                         if (!this->decode(this, NULL)) continue;
3285
3286                         /*
3287                          *      Go service the interrupt.
3288                          */
3289                         event_poll_detail(this);
3290                 }
3291         }
3292 #endif
3293
3294         if ((flag & RADIUS_SIGNAL_SELF_NEW_FD) != 0) {
3295                 rad_listen_t *this;
3296
3297                 for (this = mainconfig.listen;
3298                      this != NULL;
3299                      this = this->next) {
3300                         event_new_fd(this);
3301                 }
3302         }
3303 }
3304
3305 #ifndef WITH_SELF_PIPE
3306 void radius_signal_self(int flag)
3307 {
3308         handle_signal_self(flag);
3309 }
3310 #else
3311 /*
3312  *      Inform ourselves that we received a signal.
3313  */
3314 void radius_signal_self(int flag)
3315 {
3316         ssize_t rcode;
3317         uint8_t buffer[16];
3318
3319         /*
3320          *      The read MUST be non-blocking for this to work.
3321          */
3322         rcode = read(self_pipe[0], buffer, sizeof(buffer));
3323         if (rcode > 0) {
3324                 ssize_t i;
3325
3326                 for (i = 0; i < rcode; i++) {
3327                         buffer[0] |= buffer[i];
3328                 }
3329         } else {
3330                 buffer[0] = 0;
3331         }
3332
3333         buffer[0] |= flag;
3334
3335         write(self_pipe[1], buffer, 1);
3336 }
3337
3338
3339 static void event_signal_handler(UNUSED fr_event_list_t *xel,
3340                                  UNUSED int fd, UNUSED void *ctx)
3341 {
3342         ssize_t i, rcode;
3343         uint8_t buffer[32];
3344
3345         rcode = read(self_pipe[0], buffer, sizeof(buffer));
3346         if (rcode <= 0) return;
3347
3348         /*
3349          *      Merge pending signals.
3350          */
3351         for (i = 0; i < rcode; i++) {
3352                 buffer[0] |= buffer[i];
3353         }
3354
3355         handle_signal_self(buffer[0]);
3356 }
3357 #endif
3358
3359
3360 static void event_socket_handler(fr_event_list_t *xel, UNUSED int fd,
3361                                  void *ctx)
3362 {
3363         rad_listen_t *listener = ctx;
3364         RAD_REQUEST_FUNP fun;
3365         REQUEST *request;
3366
3367         rad_assert(xel == el);
3368
3369         xel = xel;
3370
3371         if (listener->fd < 0) rad_panic("Socket was closed on us!");
3372
3373         if (!listener->recv(listener, &fun, &request)) return;
3374
3375         if (!thread_pool_addrequest(request, fun)) {
3376                 request->child_state = REQUEST_DONE;
3377         }
3378 }
3379
3380 typedef struct listen_detail_t {
3381         fr_event_t      *ev;
3382 } listen_detail_t;
3383
3384 /*
3385  *      This function is called periodically to see if this detail
3386  *      file is available for reading.
3387  */
3388 static void event_poll_detail(void *ctx)
3389 {
3390         int rcode, delay;
3391         RAD_REQUEST_FUNP fun;
3392         REQUEST *request;
3393         rad_listen_t *this = ctx;
3394         struct timeval when;
3395         listen_detail_t *detail = this->data;
3396
3397         rad_assert(this->type == RAD_LISTEN_DETAIL);
3398
3399         /*
3400          *      Try to read something.
3401          *
3402          *      FIXME: This does poll AND receive.
3403          */
3404         rcode = this->recv(this, &fun, &request);
3405         if (rcode != 0) {
3406                 rad_assert(fun != NULL);
3407                 rad_assert(request != NULL);
3408
3409                 if (!thread_pool_addrequest(request, fun)) {
3410                         request->child_state = REQUEST_DONE;
3411                 }
3412         }
3413
3414         if (!fr_event_now(el, &now)) gettimeofday(&now, NULL);
3415         when = now;
3416
3417         /*
3418          *      Backdoor API to get the delay until the next poll
3419          *      time.
3420          */
3421         delay = this->encode(this, NULL);
3422         tv_add(&when, delay);
3423
3424         if (!fr_event_insert(el, event_poll_detail, this,
3425                              &when, &detail->ev)) {
3426                 radlog(L_ERR, "Failed creating handler");
3427                 exit(1);
3428         }
3429 }
3430
3431
3432 static void event_status(struct timeval *wake)
3433 {
3434 #if !defined(HAVE_PTHREAD_H) && defined(WNOHANG)
3435         int argval;
3436 #endif
3437
3438         if (debug_flag == 0) {
3439                 if (just_started) {
3440                         radlog(L_INFO, "Ready to process requests.");
3441                         just_started = FALSE;
3442                 }
3443                 return;
3444         }
3445
3446         if (!wake) {
3447                 DEBUG("Ready to process requests.");
3448
3449         } else if ((wake->tv_sec != 0) ||
3450                    (wake->tv_usec >= 100000)) {
3451                 DEBUG("Waking up in %d.%01u seconds.",
3452                       (int) wake->tv_sec, (unsigned int) wake->tv_usec / 100000);
3453         }
3454
3455
3456         /*
3457          *      FIXME: Put this somewhere else, where it isn't called
3458          *      all of the time...
3459          */
3460
3461 #if !defined(HAVE_PTHREAD_H) && defined(WNOHANG)
3462         /*
3463          *      If there are no child threads, then there may
3464          *      be child processes.  In that case, wait for
3465          *      their exit status, and throw that exit status
3466          *      away.  This helps get rid of zxombie children.
3467          */
3468         while (waitpid(-1, &argval, WNOHANG) > 0) {
3469                 /* do nothing */
3470         }
3471 #endif
3472
3473 }
3474
3475 /*
3476  *      Externally-visibly functions.
3477  */
3478 int radius_event_init(CONF_SECTION *cs, int spawn_flag)
3479 {
3480         rad_listen_t *this, *head = NULL;
3481
3482         if (el) return 0;
3483
3484         time(&fr_start_time);
3485
3486         el = fr_event_list_create(event_status);
3487         if (!el) return 0;
3488
3489         pl = fr_packet_list_create(0);
3490         if (!pl) return 0;      /* leak el */
3491
3492         request_num_counter = 0;
3493
3494 #ifdef WITH_PROXY
3495         if (mainconfig.proxy_requests) {
3496                 pthread_mutexattr_t attr;
3497
3498                 /*
3499                  *      Create the tree for managing proxied requests and
3500                  *      responses.
3501                  */
3502                 proxy_list = fr_packet_list_create(1);
3503                 if (!proxy_list) return 0;
3504
3505 #ifdef HAVE_PTHREAD_H
3506                 pthread_mutexattr_init(&attr);
3507
3508 #ifdef PTHREAD_MUTEX_RECURSIVE
3509                 if (pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_RECURSIVE) < 0) {
3510                         radlog(L_ERR, "FATAL: Failed to set type for proxy mutex: %s",
3511                                strerror(errno));
3512                         exit(1);
3513                 }
3514 #endif
3515
3516                 if (pthread_mutex_init(&proxy_mutex, NULL) != 0) {
3517                         radlog(L_ERR, "FATAL: Failed to initialize proxy mutex: %s",
3518                                strerror(errno));
3519                         exit(1);
3520                 }
3521
3522                 pthread_mutexattr_destroy(&attr);
3523 #endif
3524         }
3525 #endif
3526
3527         /*
3528          *      Just before we spawn the child threads, force the log
3529          *      subsystem to re-open the log file for every write.
3530          */
3531         if (spawn_flag) force_log_reopen();
3532
3533 #ifdef HAVE_PTHREAD_H
3534 #ifndef __MINGW32__
3535         NO_SUCH_CHILD_PID = (pthread_t ) (0);
3536 #else
3537         NO_SUCH_CHILD_PID = pthread_self(); /* not a child thread */
3538 #endif
3539         /*
3540          *      Initialize the threads ONLY if we're spawning, AND
3541          *      we're running normally.
3542          */
3543         if (spawn_flag && !check_config &&
3544             (thread_pool_init(cs, &spawn_flag) < 0)) {
3545                 exit(1);
3546         }
3547 #endif
3548
3549         /*
3550          *      Move all of the thread calls to this file?
3551          *
3552          *      It may be best for the mutexes to be in this file...
3553          */
3554         have_children = spawn_flag;
3555
3556         if (check_config) {
3557                 DEBUG("%s: #### Skipping IP addresses and Ports ####",
3558                        mainconfig.name);
3559                 return 1;
3560         }
3561
3562 #ifdef WITH_SELF_PIPE
3563         /*
3564          *      Child threads need a pipe to signal us, as do the
3565          *      signal handlers.
3566          */
3567         if (pipe(self_pipe) < 0) {
3568                 radlog(L_ERR, "radiusd: Error opening internal pipe: %s",
3569                        strerror(errno));
3570                 exit(1);
3571         }
3572         if (fcntl(self_pipe[0], F_SETFL, O_NONBLOCK | FD_CLOEXEC) < 0) {
3573                 radlog(L_ERR, "radiusd: Error setting internal flags: %s",
3574                        strerror(errno));
3575                 exit(1);
3576         }
3577         if (fcntl(self_pipe[1], F_SETFL, O_NONBLOCK | FD_CLOEXEC) < 0) {
3578                 radlog(L_ERR, "radiusd: Error setting internal flags: %s",
3579                        strerror(errno));
3580                 exit(1);
3581         }
3582
3583         if (!fr_event_fd_insert(el, 0, self_pipe[0],
3584                                   event_signal_handler, el)) {
3585                 radlog(L_ERR, "Failed creating handler for signals");
3586                 exit(1);
3587         }
3588 #endif  /* WITH_SELF_PIPE */
3589
3590 #ifdef WITH_PROXY
3591         /*
3592          *      Mark the proxy Fd's as unused.
3593          */
3594         {
3595                 int i;
3596
3597                 for (i = 0; i < 32; i++) proxy_fds[i] = -1;
3598         }
3599 #endif
3600
3601        DEBUG("%s: #### Opening IP addresses and Ports ####",
3602                mainconfig.name);
3603
3604        /*
3605         *       The server temporarily switches to an unprivileged
3606         *       user very early in the bootstrapping process.
3607         *       However, some sockets MAY require privileged access
3608         *       (bind to device, or to port < 1024, or to raw
3609         *       sockets).  Those sockets need to call suid up/down
3610         *       themselves around the functions that need a privileged
3611         *       uid.
3612         */
3613         if (listen_init(cs, &head) < 0) {
3614                 _exit(1);
3615         }
3616
3617         /*
3618          *      At this point, no one has any business *ever* going
3619          *      back to root uid.
3620          */
3621         fr_suid_down_permanent();
3622
3623         /*
3624          *      Add all of the sockets to the event loop.
3625          */
3626         for (this = head;
3627              this != NULL;
3628              this = this->next) {
3629                 char buffer[256];
3630
3631                 this->print(this, buffer, sizeof(buffer));
3632
3633                 switch (this->type) {
3634 #ifdef WITH_DETAIL
3635                 case RAD_LISTEN_DETAIL:
3636                         DEBUG("Listening on %s", buffer);
3637
3638                         /*
3639                          *      Detail files are always known, and aren't
3640                          *      put into the socket event loop.
3641                          */
3642                         this->status = RAD_LISTEN_STATUS_KNOWN;
3643
3644                         /*
3645                          *      Set up the first poll interval.
3646                          */
3647                         event_poll_detail(this);
3648                         break;
3649 #endif
3650
3651 #ifdef WITH_PROXY
3652                 case RAD_LISTEN_PROXY:
3653                         rad_assert(proxy_fds[this->fd & 0x1f] == -1);
3654                         rad_assert(proxy_listeners[this->fd & 0x1f] == NULL);
3655
3656                         proxy_fds[this->fd & 0x1f] = this->fd;
3657                         proxy_listeners[this->fd & 0x1f] = this;
3658                         if (!fr_packet_list_socket_add(proxy_list,
3659                                                          this->fd)) {
3660                                 rad_assert(0 == 1);
3661                         }
3662                         /* FALL-THROUGH */
3663 #endif
3664
3665                 default:
3666                         break;
3667                 }
3668
3669                 event_new_fd(this);
3670         }
3671
3672         mainconfig.listen = head;
3673
3674         return 1;
3675 }
3676
3677
3678 static int request_hash_cb(UNUSED void *ctx, void *data)
3679 {
3680         REQUEST *request = fr_packet2myptr(REQUEST, packet, data);
3681
3682 #ifdef WITH_PROXY
3683         rad_assert(request->in_proxy_hash == FALSE);
3684 #endif
3685
3686         ev_request_free(&request);
3687
3688         return 0;
3689 }
3690
3691
3692 #ifdef WITH_PROXY
3693 static int proxy_hash_cb(UNUSED void *ctx, void *data)
3694 {
3695         REQUEST *request = fr_packet2myptr(REQUEST, proxy, data);
3696
3697         ev_request_free(&request);
3698
3699         return 0;
3700 }
3701 #endif
3702
3703 void radius_event_free(void)
3704 {
3705         /*
3706          *      FIXME: Stop all threads, or at least check that
3707          *      they're all waiting on the semaphore, and the queues
3708          *      are empty.
3709          */
3710
3711 #ifdef WITH_PROXY
3712         /*
3713          *      There are requests in the proxy hash that aren't
3714          *      referenced from anywhere else.  Remove them first.
3715          */
3716         if (proxy_list) {
3717                 PTHREAD_MUTEX_LOCK(&proxy_mutex);
3718                 fr_packet_list_walk(proxy_list, NULL, proxy_hash_cb);
3719                 PTHREAD_MUTEX_UNLOCK(&proxy_mutex);
3720                 fr_packet_list_free(proxy_list);
3721                 proxy_list = NULL;
3722         }
3723 #endif
3724
3725         fr_packet_list_walk(pl, NULL, request_hash_cb);
3726
3727         fr_packet_list_free(pl);
3728         pl = NULL;
3729
3730         fr_event_list_free(el);
3731 }
3732
3733 int radius_event_process(void)
3734 {
3735         if (!el) return 0;
3736
3737         return fr_event_loop(el);
3738 }
3739
3740 void radius_handle_request(REQUEST *request, RAD_REQUEST_FUNP fun)
3741 {
3742         request->options = RAD_REQUEST_OPTION_DEBUG2;
3743
3744         if (request_pre_handler(request)) {
3745                 rad_assert(fun != NULL);
3746                 rad_assert(request != NULL);
3747
3748                 if (request->server) RDEBUG("server %s {",
3749                                             request->server != NULL ?
3750                                             request->server : "");
3751                 fun(request);
3752
3753                 if (request->server) RDEBUG("} # server %s",
3754                                              request->server != NULL ?
3755                                             request->server : "");
3756
3757                 request_post_handler(request);
3758         }
3759
3760         DEBUG2("Going to the next request");
3761         return;
3762 }