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 #ifdef WITH_TCP
 148         request->listener->count--;
 149
 150         /*
 151          *      The TCP socket was closed, but we've got to
 152          *      hang around until done.
 153          */
 154         if ((request->listener->status == RAD_LISTEN_STATUS_FINISH) &&
 155             (request->listener->count == 0)) {
 156                 listen_free(&request->listener);
 157         }
 158 #endif
 159 }
 160
 161
 162 #ifdef WITH_PROXY
 163 static REQUEST *lookup_in_proxy_hash(RADIUS_PACKET *reply)
 164 {
 165         RADIUS_PACKET **proxy_p;
 166         REQUEST *request;
 167
 168         PTHREAD_MUTEX_LOCK(&proxy_mutex);
 169         proxy_p = fr_packet_list_find_byreply(proxy_list, reply);
 170
 171         if (!proxy_p) {
 172                 PTHREAD_MUTEX_UNLOCK(&proxy_mutex);
 173                 return NULL;
 174         }
 175
 176         request = fr_packet2myptr(REQUEST, proxy, proxy_p);
 177
 178         if (!request) {
 179                 PTHREAD_MUTEX_UNLOCK(&proxy_mutex);
 180                 return NULL;
 181         }
 182
 183         request->num_proxied_responses++;
 184
 185         /*
 186          *      Catch the most common case of everything working
 187          *      correctly.
 188          */
 189         if (request->num_proxied_requests == request->num_proxied_responses) {
 190                 fr_packet_list_yank(proxy_list, request->proxy);
 191                 fr_packet_list_id_free(proxy_list, request->proxy);
 192                 request->in_proxy_hash = FALSE;
 193         }
 194
 195         /*
 196          *      On the FIRST reply, decrement the count of outstanding
 197          *      requests.  Note that this is NOT the count of sent
 198          *      packets, but whether or not the home server has
 199          *      responded at all.
 200          */
 201         if (!request->proxy_reply &&
 202             request->home_server &&
 203             request->home_server->currently_outstanding) {
 204                 request->home_server->currently_outstanding--;
 205         }
 206
 207         PTHREAD_MUTEX_UNLOCK(&proxy_mutex);
 208
 209         return request;
 210 }
 211
 212
 213 static void remove_from_proxy_hash(REQUEST *request)
 214 {
 215         /*
 216          *      Check this without grabbing the mutex because it's a
 217          *      lot faster that way.
 218          */
 219         if (!request->in_proxy_hash) return;
 220
 221         /*
 222          *      The "not in hash" flag is definitive.  However, if the
 223          *      flag says that it IS in the hash, there might still be
 224          *      a race condition where it isn't.
 225          */
 226         PTHREAD_MUTEX_LOCK(&proxy_mutex);
 227
 228         if (!request->in_proxy_hash) {
 229                 PTHREAD_MUTEX_UNLOCK(&proxy_mutex);
 230                 return;
 231         }
 232
 233         fr_packet_list_yank(proxy_list, request->proxy);
 234         fr_packet_list_id_free(proxy_list, request->proxy);
 235
 236         /*
 237          *      The home server hasn't replied, but we've given up on
 238          *      this request.  Don't count this request against the
 239          *      home server.
 240          */
 241         if (!request->proxy_reply &&
 242             request->home_server &&
 243             request->home_server->currently_outstanding) {
 244                 request->home_server->currently_outstanding--;
 245         }
 246
 247         /*
 248          *      Got from YES in hash, to NO, not in hash while we hold
 249          *      the mutex.  This guarantees that when another thread
 250          *      grans the mutex, the "not in hash" flag is correct.
 251          */
 252         request->in_proxy_hash = FALSE;
 253
 254         PTHREAD_MUTEX_UNLOCK(&proxy_mutex);
 255 }
 256 #endif  /* WITH_PROXY */
 257
 258 static void ev_request_free(REQUEST **prequest)
 259 {
 260         REQUEST *request;
 261
 262         if (!prequest || !*prequest) return;
 263
 264         request = *prequest;
 265
 266 #ifdef WITH_COA
 267         if (request->coa) {
 268                 /*
 269                  *      Divorce the child from the parent first,
 270                  *      then clean up the child.
 271                  */
 272                 request->coa->parent = NULL;
 273                 ev_request_free(&request->coa);
 274         }
 275
 276         /*
 277          *      Divorce the parent from the child, and leave the
 278          *      parent still alive.
 279          */
 280         if (request->parent && (request->parent->coa == request)) {
 281                 request->parent->coa = NULL;
 282         }
 283 #endif
 284
 285         if (request->ev) fr_event_delete(el, &request->ev);
 286 #ifdef WITH_PROXY
 287         if (request->in_proxy_hash) remove_from_proxy_hash(request);
 288 #endif
 289         if (request->in_request_hash) remove_from_request_hash(request);
 290
 291         request_free(prequest);
 292 }
 293
 294 #ifdef WITH_PROXY
 295 static int proxy_id_alloc(REQUEST *request, RADIUS_PACKET *packet)
 296 {
 297         int i, proxy, found;
 298         rad_listen_t *proxy_listener;
 299
 300         if (fr_packet_list_id_alloc(proxy_list, packet)) return 1;
 301
 302         /*
 303          *      Allocate a new proxy fd.  This function adds
 304          *      it to the tail of the list of listeners.  With
 305          *      some care, this can be thread-safe.
 306          */
 307         proxy_listener = proxy_new_listener(&packet->src_ipaddr, FALSE);
 308         if (!proxy_listener) {
 309                 RDEBUG2("ERROR: Failed to create a new socket for proxying requests.");
 310                 return 0;
 311         }
 312
 313         /*
 314          *      Cache it locally.
 315          */
 316         found = -1;
 317         proxy = proxy_listener->fd;
 318         for (i = 0; i < 32; i++) {
 319                 /*
 320                  *      Found a free entry.  Save the socket,
 321                  *      and remember where we saved it.
 322                  */
 323                 if (proxy_fds[(proxy + i) & 0x1f] == -1) {
 324                         found = (proxy + i) & 0x1f;
 325                         proxy_fds[found] = proxy;
 326                         proxy_listeners[found] = proxy_listener;
 327                         break;
 328                 }
 329         }
 330         rad_assert(found >= 0);
 331
 332         if (!fr_packet_list_socket_add(proxy_list, proxy_listener->fd)) {
 333                         RDEBUG2("ERROR: Failed to create a new socket for proxying requests.");
 334                 return 0;
 335
 336         }
 337
 338         if (!fr_packet_list_id_alloc(proxy_list, packet)) {
 339                         RDEBUG2("ERROR: Failed to create a new socket for proxying requests.");
 340                 return 0;
 341         }
 342
 343         /*
 344          *      Signal the main thread to add the new FD to the list
 345          *      of listening FD's.
 346          */
 347         radius_signal_self(RADIUS_SIGNAL_SELF_NEW_FD);
 348         return 1;
 349 }
 350
 351
 352 static int insert_into_proxy_hash(REQUEST *request, int retransmit)
 353 {
 354         int i, proxy;
 355         char buf[128];
 356
 357         rad_assert(request->proxy != NULL);
 358         rad_assert(proxy_list != NULL);
 359
 360         PTHREAD_MUTEX_LOCK(&proxy_mutex);
 361
 362         /*
 363          *      Keep track of maximum outstanding requests to a
 364          *      particular home server.  'max_outstanding' is
 365          *      enforced in home_server_ldb(), in realms.c.
 366          */
 367         if (request->home_server) {
 368                 request->home_server->currently_outstanding++;
 369         }
 370
 371         if (retransmit) {
 372                 RADIUS_PACKET packet;
 373
 374                 packet = *request->proxy;
 375
 376                 if (!proxy_id_alloc(request, &packet)) {
 377                         PTHREAD_MUTEX_UNLOCK(&proxy_mutex);
 378                         return 0;
 379                 }
 380
 381                 /*
 382                  *      Yank the request, free the old Id, and
 383                  *      remember the new Id.
 384                  */
 385                 fr_packet_list_yank(proxy_list, request->proxy);
 386                 fr_packet_list_id_free(proxy_list, request->proxy);
 387                 *request->proxy = packet;
 388
 389         } else if (!proxy_id_alloc(request, request->proxy)) {
 390                 PTHREAD_MUTEX_UNLOCK(&proxy_mutex);
 391                 return 0;
 392         }
 393
 394         rad_assert(request->proxy->sockfd >= 0);
 395
 396         /*
 397          *      FIXME: Hack until we get rid of rad_listen_t, and put
 398          *      the information into the packet_list.
 399          */
 400         proxy = -1;
 401         for (i = 0; i < 32; i++) {
 402                 if (proxy_fds[i] == request->proxy->sockfd) {
 403                         proxy = i;
 404                         break;
 405                 }
 406         }
 407
 408         if (proxy < 0) {
 409                 PTHREAD_MUTEX_UNLOCK(&proxy_mutex);
 410                 RDEBUG2("ERROR: All sockets are full.");
 411                 return 0;
 412         }
 413
 414         rad_assert(proxy_fds[proxy] != -1);
 415         rad_assert(proxy_listeners[proxy] != NULL);
 416         request->proxy_listener = proxy_listeners[proxy];
 417
 418         if (!fr_packet_list_insert(proxy_list, &request->proxy)) {
 419                 fr_packet_list_id_free(proxy_list, request->proxy);
 420                 PTHREAD_MUTEX_UNLOCK(&proxy_mutex);
 421                 RDEBUG2("ERROR: Failed to insert entry into proxy list");
 422                 return 0;
 423         }
 424
 425         request->in_proxy_hash = TRUE;
 426
 427         PTHREAD_MUTEX_UNLOCK(&proxy_mutex);
 428
 429         RDEBUG3(" proxy: allocating destination %s port %d - Id %d",
 430                inet_ntop(request->proxy->dst_ipaddr.af,
 431                          &request->proxy->dst_ipaddr.ipaddr, buf, sizeof(buf)),
 432                request->proxy->dst_port,
 433                request->proxy->id);
 434
 435         return 1;
 436 }
 437
 438
 439 /*
 440  *      Called as BOTH an event, and in-line from other functions.
 441  */
 442 static void wait_for_proxy_id_to_expire(void *ctx)
 443 {
 444         REQUEST *request = ctx;
 445
 446         rad_assert(request->magic == REQUEST_MAGIC);
 447         rad_assert(request->proxy != NULL);
 448
 449         if (!fr_event_now(el, &now)) gettimeofday(&now, NULL);
 450         request->when = request->proxy_when;
 451
 452 #ifdef WITH_COA
 453         if (((request->proxy->code == PW_COA_REQUEST) ||
 454              (request->proxy->code == PW_DISCONNECT_REQUEST)) &&
 455             (request->packet->code != request->proxy->code)) {
 456                 request->when.tv_sec += request->home_server->coa_mrd;
 457         } else
 458 #endif
 459         request->when.tv_sec += request->home_server->response_window;
 460
 461         if ((request->num_proxied_requests == request->num_proxied_responses) ||
 462             timercmp(&now, &request->when, >)) {
 463                 if (request->packet) {
 464                         RDEBUG2("Cleaning up request %d ID %d with timestamp +%d",
 465                                request->number, request->packet->id,
 466                                (unsigned int) (request->timestamp - fr_start_time));
 467                 } else {
 468                         RDEBUG2("Cleaning up request %d with timestamp +%d",
 469                                request->number,
 470                                (unsigned int) (request->timestamp - fr_start_time));
 471                 }
 472
 473                 ev_request_free(&request);
 474                 return;
 475         }
 476
 477         INSERT_EVENT(wait_for_proxy_id_to_expire, request);
 478 }
 479 #endif
 480
 481 #ifdef HAVE_PTHREAD_H
 482 static void wait_for_child_to_die(void *ctx)
 483 {
 484         REQUEST *request = ctx;
 485
 486         rad_assert(request->magic == REQUEST_MAGIC);
 487
 488         if ((request->child_state == REQUEST_QUEUED) |
 489             (request->child_state == REQUEST_RUNNING)) {
 490                 request->delay += (request->delay >> 1);
 491                 tv_add(&request->when, request->delay);
 492
 493                 RDEBUG2("Child is still stuck for request %d", request->number);
 494
 495                 INSERT_EVENT(wait_for_child_to_die, request);
 496                 return;
 497         }
 498
 499         RDEBUG2("Child is finally responsive for request %d", request->number);
 500         remove_from_request_hash(request);
 501
 502 #ifdef WITH_PROXY
 503         if (request->proxy) {
 504                 wait_for_proxy_id_to_expire(request);
 505                 return;
 506         }
 507 #endif
 508
 509         ev_request_free(&request);
 510 }
 511 #endif
 512
 513 static void cleanup_delay(void *ctx)
 514 {
 515         REQUEST *request = ctx;
 516
 517         rad_assert(request->magic == REQUEST_MAGIC);
 518         rad_assert((request->child_state == REQUEST_CLEANUP_DELAY) ||
 519                    (request->child_state == REQUEST_DONE));
 520
 521         remove_from_request_hash(request);
 522
 523 #ifdef WITH_PROXY
 524         if (request->proxy && request->in_proxy_hash) {
 525                 wait_for_proxy_id_to_expire(request);
 526                 return;
 527         }
 528 #endif
 529
 530         RDEBUG2("Cleaning up request %d ID %d with timestamp +%d",
 531                request->number, request->packet->id,
 532                (unsigned int) (request->timestamp - fr_start_time));
 533
 534         ev_request_free(&request);
 535 }
 536
 537
 538 /*
 539  *      In daemon mode, AND this request has debug flags set.
 540  */
 541 #define DEBUG_PACKET if (!debug_flag && request->options && request->radlog) debug_packet
 542
 543 static void debug_packet(REQUEST *request, RADIUS_PACKET *packet, int direction)
 544 {
 545         VALUE_PAIR *vp;
 546         char buffer[1024];
 547         const char *received, *from;
 548         const fr_ipaddr_t *ip;
 549         int port;
 550
 551         if (!packet) return;
 552
 553         rad_assert(request->radlog != NULL);
 554
 555         if (direction == 0) {
 556                 received = "Received";
 557                 from = "from";  /* what else? */
 558                 ip = &packet->src_ipaddr;
 559                 port = packet->src_port;
 560
 561         } else {
 562                 received = "Sending";
 563                 from = "to";    /* hah! */
 564                 ip = &packet->dst_ipaddr;
 565                 port = packet->dst_port;
 566         }
 567
 568         /*
 569          *      Client-specific debugging re-prints the input
 570          *      packet into the client log.
 571          *
 572          *      This really belongs in a utility library
 573          */
 574         if ((packet->code > 0) && (packet->code < FR_MAX_PACKET_CODE)) {
 575                 RDEBUG("%s %s packet %s host %s port %d, id=%d, length=%d",
 576                        received, fr_packet_codes[packet->code], from,
 577                        inet_ntop(ip->af, &ip->ipaddr, buffer, sizeof(buffer)),
 578                        port, packet->id, packet->data_len);
 579         } else {
 580                 RDEBUG("%s packet %s host %s port %d code=%d, id=%d, length=%d",
 581                        received, from,
 582                        inet_ntop(ip->af, &ip->ipaddr, buffer, sizeof(buffer)),
 583                        port,
 584                        packet->code, packet->id, packet->data_len);
 585         }
 586
 587         for (vp = packet->vps; vp != NULL; vp = vp->next) {
 588                 vp_prints(buffer, sizeof(buffer), vp);
 589                 request->radlog(L_DBG, 0, request, "\t%s", buffer);
 590         }
 591 }
 592
 593 static void reject_delay(void *ctx)
 594 {
 595         REQUEST *request = ctx;
 596
 597         rad_assert(request->magic == REQUEST_MAGIC);
 598         rad_assert(request->child_state == REQUEST_REJECT_DELAY);
 599
 600         RDEBUG2("Sending delayed reject for request %d", request->number);
 601
 602         DEBUG_PACKET(request, request->reply, 1);
 603
 604         request->listener->send(request->listener, request);
 605
 606         request->when.tv_sec += request->root->cleanup_delay;
 607         request->child_state = REQUEST_CLEANUP_DELAY;
 608
 609         INSERT_EVENT(cleanup_delay, request);
 610 }
 611
 612
 613 #ifdef WITH_PROXY
 614 void revive_home_server(void *ctx)
 615 {
 616         home_server *home = ctx;
 617         char buffer[128];
 618
 619 #ifdef WITH_TCP
 620         rad_assert(home->proto != IPPROTO_TCP);
 621 #endif
 622
 623         home->state = HOME_STATE_ALIVE;
 624         home->currently_outstanding = 0;
 625         home->revive_time = now;
 626
 627         /*
 628          *      Delete any outstanding events.
 629          */
 630         if (home->ev) fr_event_delete(el, &home->ev);
 631
 632         radlog(L_INFO, "PROXY: Marking home server %s port %d alive again... we have no idea if it really is alive or not.",
 633                inet_ntop(home->ipaddr.af, &home->ipaddr.ipaddr,
 634                          buffer, sizeof(buffer)),
 635                home->port);
 636
 637 }
 638
 639
 640 static void no_response_to_ping(void *ctx)
 641 {
 642         REQUEST *request = ctx;
 643         home_server *home;
 644         char buffer[128];
 645
 646         rad_assert(request->home_server != NULL);
 647
 648         home = request->home_server;
 649 #ifdef WITH_TCP
 650         rad_assert(home->proto != IPPROTO_TCP);
 651 #endif
 652
 653         home->num_received_pings = 0;
 654
 655         RDEBUG2("No response to status check %d from home server %s port %d",
 656                request->number,
 657                inet_ntop(request->proxy->dst_ipaddr.af,
 658                          &request->proxy->dst_ipaddr.ipaddr,
 659                          buffer, sizeof(buffer)),
 660                request->proxy->dst_port);
 661
 662         wait_for_proxy_id_to_expire(request);
 663 }
 664
 665
 666 static void received_response_to_ping(REQUEST *request)
 667 {
 668         home_server *home;
 669         char buffer[128];
 670
 671         rad_assert(request->home_server != NULL);
 672
 673         home = request->home_server;
 674 #ifdef WITH_TCP
 675         rad_assert(home->proto != IPPROTO_TCP);
 676 #endif
 677
 678         home->num_received_pings++;
 679
 680         RDEBUG2("Received response to status check %d (%d in current sequence)",
 681                request->number, home->num_received_pings);
 682
 683         /*
 684          *      Remove the request from any hashes
 685          */
 686         fr_event_delete(el, &request->ev);
 687         remove_from_proxy_hash(request);
 688         rad_assert(request->in_request_hash == FALSE);
 689
 690         /*
 691          *      The control socket may have marked the home server as
 692          *      alive.  OR, it may have suddenly started responding to
 693          *      requests again.  If so, don't re-do the "make alive"
 694          *      work.
 695          */
 696         if (home->state == HOME_STATE_ALIVE) return;
 697
 698         /*
 699          *      We haven't received enough ping responses to mark it
 700          *      "alive".  Wait a bit.
 701          */
 702         if (home->num_received_pings < home->num_pings_to_alive) {
 703                 return;
 704         }
 705
 706         home->state = HOME_STATE_ALIVE;
 707         home->currently_outstanding = 0;
 708         home->revive_time = now;
 709
 710         if (!fr_event_delete(el, &home->ev)) {
 711                 RDEBUG2("Hmm... no event for home server.  Oh well.");
 712         }
 713
 714         radlog(L_INFO, "PROXY: Marking home server %s port %d alive",
 715                inet_ntop(request->proxy->dst_ipaddr.af,
 716                          &request->proxy->dst_ipaddr.ipaddr,
 717                          buffer, sizeof(buffer)),
 718                request->proxy->dst_port);
 719 }
 720
 721
 722 /*
 723  *      Called from start of zombie period, OR after control socket
 724  *      marks the home server dead.
 725  */
 726 static void ping_home_server(void *ctx)
 727 {
 728         uint32_t jitter;
 729         home_server *home = ctx;
 730         REQUEST *request;
 731         VALUE_PAIR *vp;
 732
 733 #ifdef WITH_TCP
 734         rad_assert(home->proto != IPPROTO_TCP);
 735 #endif
 736
 737         if ((home->state == HOME_STATE_ALIVE) ||
 738             (home->ping_check == HOME_PING_CHECK_NONE) ||
 739             (home->ev != NULL)) {
 740                 return;
 741         }
 742
 743         request = request_alloc();
 744         request->number = request_num_counter++;
 745
 746         request->proxy = rad_alloc(1);
 747         rad_assert(request->proxy != NULL);
 748
 749         fr_event_now(el, &request->when);
 750         home->when = request->when;
 751
 752         if (home->ping_check == HOME_PING_CHECK_STATUS_SERVER) {
 753                 request->proxy->code = PW_STATUS_SERVER;
 754
 755                 radius_pairmake(request, &request->proxy->vps,
 756                                 "Message-Authenticator", "0x00", T_OP_SET);
 757
 758         } else if (home->type == HOME_TYPE_AUTH) {
 759                 request->proxy->code = PW_AUTHENTICATION_REQUEST;
 760
 761                 radius_pairmake(request, &request->proxy->vps,
 762                                 "User-Name", home->ping_user_name, T_OP_SET);
 763                 radius_pairmake(request, &request->proxy->vps,
 764                                 "User-Password", home->ping_user_password, T_OP_SET);
 765                 radius_pairmake(request, &request->proxy->vps,
 766                                 "Service-Type", "Authenticate-Only", T_OP_SET);
 767                 radius_pairmake(request, &request->proxy->vps,
 768                                 "Message-Authenticator", "0x00", T_OP_SET);
 769
 770         } else {
 771 #ifdef WITH_ACCOUNTING
 772                 request->proxy->code = PW_ACCOUNTING_REQUEST;
 773
 774                 radius_pairmake(request, &request->proxy->vps,
 775                                 "User-Name", home->ping_user_name, T_OP_SET);
 776                 radius_pairmake(request, &request->proxy->vps,
 777                                 "Acct-Status-Type", "Stop", T_OP_SET);
 778                 radius_pairmake(request, &request->proxy->vps,
 779                                 "Acct-Session-Id", "00000000", T_OP_SET);
 780                 vp = radius_pairmake(request, &request->proxy->vps,
 781                                      "Event-Timestamp", "0", T_OP_SET);
 782                 vp->vp_date = now.tv_sec;
 783 #else
 784                 rad_assert("Internal sanity check failed");
 785 #endif
 786         }
 787
 788         radius_pairmake(request, &request->proxy->vps,
 789                         "NAS-Identifier", "Status Check. Are you alive?",
 790                         T_OP_SET);
 791
 792         request->proxy->dst_ipaddr = home->ipaddr;
 793         request->proxy->dst_port = home->port;
 794         request->home_server = home;
 795
 796         rad_assert(request->proxy_listener == NULL);
 797
 798         if (!insert_into_proxy_hash(request, FALSE)) {
 799                 RDEBUG2("ERROR: Failed inserting status check %d into proxy hash.  Discarding it.",
 800                        request->number);
 801                 ev_request_free(&request);
 802                 return;
 803         }
 804         rad_assert(request->proxy_listener != NULL);
 805         request->proxy_listener->send(request->proxy_listener,
 806                                       request);
 807
 808         request->next_callback = NULL;
 809         request->child_state = REQUEST_PROXIED;
 810         request->when.tv_sec += home->ping_timeout;;
 811
 812         INSERT_EVENT(no_response_to_ping, request);
 813
 814         /*
 815          *      Add +/- 2s of jitter, as suggested in RFC 3539
 816          *      and in the Issues and Fixes draft.
 817          */
 818         home->when.tv_sec += home->ping_interval - 2;
 819
 820         jitter = fr_rand();
 821         jitter ^= (jitter >> 10);
 822         jitter &= ((1 << 23) - 1); /* 22 bits of 1 */
 823
 824         tv_add(&home->when, jitter);
 825
 826         INSERT_EVENT(ping_home_server, home);
 827 }
 828
 829
 830 void mark_home_server_dead(home_server *home, struct timeval *when)
 831 {
 832         int previous_state = home->state;
 833         char buffer[128];
 834
 835         radlog(L_INFO, "PROXY: Marking home server %s port %d as dead.",
 836                inet_ntop(home->ipaddr.af, &home->ipaddr.ipaddr,
 837                          buffer, sizeof(buffer)),
 838                home->port);
 839
 840         home->state = HOME_STATE_IS_DEAD;
 841         home->num_received_pings = 0;
 842
 843         if (home->ping_check != HOME_PING_CHECK_NONE) {
 844                 /*
 845                  *      If the control socket marks us dead, start
 846                  *      pinging.  Otherwise, we already started
 847                  *      pinging when it was marked "zombie".
 848                  */
 849                 if (previous_state == HOME_STATE_ALIVE) {
 850                         ping_home_server(home);
 851                 }
 852
 853         } else {
 854                 /*
 855                  *      Revive it after a fixed period of time.  This
 856                  *      is very, very, bad.
 857                  */
 858                 home->when = *when;
 859                 home->when.tv_sec += home->revive_interval;
 860
 861                 INSERT_EVENT(revive_home_server, home);
 862         }
 863 }
 864
 865 static void check_for_zombie_home_server(REQUEST *request)
 866 {
 867         home_server *home;
 868         struct timeval when;
 869
 870         home = request->home_server;
 871
 872         if (home->state != HOME_STATE_ZOMBIE) return;
 873
 874         when = home->zombie_period_start;
 875         when.tv_sec += home->zombie_period;
 876
 877         fr_event_now(el, &now);
 878         if (timercmp(&now, &when, <)) {
 879                 return;
 880         }
 881
 882         mark_home_server_dead(home, &request->when);
 883 }
 884
 885 static int proxy_to_virtual_server(REQUEST *request);
 886
 887 static int virtual_server_handler(UNUSED REQUEST *request)
 888 {
 889         proxy_to_virtual_server(request);
 890         return 0;
 891 }
 892
 893 static void proxy_fallback_handler(REQUEST *request)
 894 {
 895         /*
 896          *      A proper time is required for wait_a_bit.
 897          */
 898         request->delay = USEC / 10;
 899         gettimeofday(&now, NULL);
 900         request->next_when = now;
 901         tv_add(&request->next_when, request->delay);
 902         request->next_callback = wait_a_bit;
 903
 904         /*
 905          *      Re-queue the request.
 906          */
 907         request->child_state = REQUEST_QUEUED;
 908
 909         rad_assert(request->proxy != NULL);
 910         if (!thread_pool_addrequest(request, virtual_server_handler)) {
 911                 request->child_state = REQUEST_DONE;
 912         }
 913
 914 #ifdef HAVE_PTHREAD_H
 915         /*
 916          *      MAY free the request if we're over max_request_time,
 917          *      AND we're not in threaded mode!
 918          *
 919          *      Note that we call this ONLY if we're threaded, as
 920          *      if we're NOT threaded, request_post_handler() calls
 921          *      wait_a_bit(), which means that "request" may not
 922          *      exist any more...
 923          */
 924         if (have_children) wait_a_bit(request);
 925 #endif
 926 }
 927
 928
 929 static int setup_post_proxy_fail(REQUEST *request)
 930 {
 931         DICT_VALUE *dval = NULL;
 932         VALUE_PAIR *vp;
 933
 934         request->child_state = REQUEST_RUNNING;
 935
 936         if (request->packet->code == PW_AUTHENTICATION_REQUEST) {
 937                 dval = dict_valbyname(PW_POST_PROXY_TYPE, "Fail-Authentication");
 938
 939         } else if (request->packet->code == PW_ACCOUNTING_REQUEST) {
 940                 dval = dict_valbyname(PW_POST_PROXY_TYPE, "Fail-Accounting");
 941
 942 #ifdef WITH_COA
 943                 /*
 944                  *      See no_response_to_coa_request
 945                  */
 946         } else if (((request->packet->code >> 8) & 0xff) == PW_COA_REQUEST) {
 947                 request->packet->code &= 0xff; /* restore it */
 948
 949                 if (request->proxy->code == PW_COA_REQUEST) {
 950                         dval = dict_valbyname(PW_POST_PROXY_TYPE, "Fail-CoA");
 951
 952                 } else if (request->proxy->code == PW_DISCONNECT_REQUEST) {
 953                         dval = dict_valbyname(PW_POST_PROXY_TYPE, "Fail-Disconnect");
 954                 } else {
 955                         return 0;
 956                 }
 957
 958 #endif
 959         } else {
 960                 return 0;
 961         }
 962
 963         if (!dval) dval = dict_valbyname(PW_POST_PROXY_TYPE, "Fail");
 964
 965         if (!dval) {
 966                 pairdelete(&request->config_items, PW_POST_PROXY_TYPE);
 967                 return 0;
 968         }
 969
 970         vp = pairfind(request->config_items, PW_POST_PROXY_TYPE);
 971         if (!vp) vp = radius_paircreate(request, &request->config_items,
 972                                         PW_POST_PROXY_TYPE, PW_TYPE_INTEGER);
 973         vp->vp_integer = dval->value;
 974
 975         rad_assert(request->proxy_reply == NULL);
 976
 977         return 1;
 978 }
 979
 980
 981 static int null_handler(UNUSED REQUEST *request)
 982 {
 983         return 0;
 984 }
 985
 986 static void post_proxy_fail_handler(REQUEST *request)
 987 {
 988         /*
 989          *      A proper time is required for wait_a_bit.
 990          */
 991         request->delay = USEC / 10;
 992         gettimeofday(&now, NULL);
 993
 994         /*
 995          *      Not set up to run Post-Proxy-Type = Fail.
 996          *
 997          *      Mark the request as still running, and figure out what
 998          *      to do next.
 999          */
1000         if (!setup_post_proxy_fail(request)) {
1001                 request_post_handler(request);
1002
1003         } else {
1004                 /*
1005                  *      Re-queue the request.
1006                  */
1007                 request->child_state = REQUEST_QUEUED;
1008
1009                 /*
1010                  *      There is a post-proxy-type of fail.  We run
1011                  *      the request through the pre/post proxy
1012                  *      handlers, just like it was a real proxied
1013                  *      request.  However, we set the per-request
1014                  *      handler to NULL, as we don't want to do
1015                  *      anything else.
1016                  *
1017                  *      Note that when we're not threaded, this will
1018                  *      process the request even if it's greater than
1019                  *      max_request_time.  That's not fatal.
1020                  */
1021                 request->priority = 0;
1022                 rad_assert(request->proxy != NULL);
1023                 thread_pool_addrequest(request, null_handler);
1024         }
1025
1026         /*
1027          *      MAY free the request if we're over max_request_time,
1028          *      AND we're not in threaded mode!
1029          *
1030          *      Note that we call this ONLY if we're threaded, as
1031          *      if we're NOT threaded, request_post_handler() calls
1032          *      wait_a_bit(), which means that "request" may not
1033          *      exist any more...
1034          */
1035         if (have_children) wait_a_bit(request);
1036 }
1037
1038
1039 /* maybe check this against wait_for_proxy_id_to_expire? */
1040 static void no_response_to_proxied_request(void *ctx)
1041 {
1042         REQUEST *request = ctx;
1043         home_server *home;
1044         char buffer[128];
1045
1046         rad_assert(request->magic == REQUEST_MAGIC);
1047         rad_assert(request->child_state == REQUEST_PROXIED);
1048
1049         /*
1050          *      If we've failed over to an internal home server,
1051          *      replace the callback with the correct one.  This
1052          *      is due to locking issues with child threads...
1053          */
1054         if (request->home_server->server) {
1055                 wait_a_bit(request);
1056                 return;
1057         }
1058
1059         check_for_zombie_home_server(request);
1060
1061         home = request->home_server;
1062
1063         /*
1064          *      The default as of 2.1.7 is to allow requests to
1065          *      fail-over to a backup home server when this one does
1066          *      not respond.  The old behavior can be configured as
1067          *      well.
1068          */
1069         if (home->no_response_fail) {
1070                 radlog(L_ERR, "Rejecting request %d (proxy Id %d) due to lack of any response from home server %s port %d",
1071                        request->number, request->proxy->id,
1072                        inet_ntop(request->proxy->dst_ipaddr.af,
1073                                  &request->proxy->dst_ipaddr.ipaddr,
1074                                  buffer, sizeof(buffer)),
1075                        request->proxy->dst_port);
1076
1077                 post_proxy_fail_handler(request);
1078         }
1079
1080         /*
1081          *      Don't touch request due to race conditions
1082          */
1083         if (home->state == HOME_STATE_IS_DEAD) {
1084                 rad_assert(home->ev != NULL); /* or it will never wake up */
1085                 return;
1086         }
1087
1088         /*
1089          *      Enable the zombie period when we notice that the home
1090          *      server hasn't responded.  We do NOT back-date the start
1091          *      of the zombie period.
1092          */
1093         if (home->state == HOME_STATE_ALIVE) {
1094                 home->state = HOME_STATE_ZOMBIE;
1095                 home->zombie_period_start = now;
1096
1097                 radlog(L_ERR, "PROXY: Marking home server %s port %d as zombie (it looks like it is dead).",
1098                        inet_ntop(home->ipaddr.af, &home->ipaddr.ipaddr,
1099                                  buffer, sizeof(buffer)),
1100                        home->port);
1101
1102                 /*
1103                  *      Start pinging the home server.
1104                  */
1105                 ping_home_server(home);
1106         }
1107 }
1108 #endif
1109
1110 static void wait_a_bit(void *ctx)
1111 {
1112         struct timeval when;
1113         REQUEST *request = ctx;
1114         fr_event_callback_t callback = NULL;
1115
1116         rad_assert(request->magic == REQUEST_MAGIC);
1117
1118         /*
1119          *      The socket was closed.  Tell the request that
1120          *      there is no point in continuing.
1121          */
1122         if (request->listener->status != RAD_LISTEN_STATUS_KNOWN) {
1123                 goto stop_processing;
1124         }
1125
1126 #ifdef WITH_COA
1127         /*
1128          *      The CoA request is a new (internally generated)
1129          *      request, created in a child thread.  We therefore need
1130          *      some way to tie its events back into the main event
1131          *      handler.
1132          */
1133         if (request->coa && !request->coa->proxy_reply &&
1134             request->coa->next_callback) {
1135                 request->coa->when = request->coa->next_when;
1136                 INSERT_EVENT(request->coa->next_callback, request->coa);
1137                 request->coa->next_callback = NULL;
1138                 request->coa->parent = NULL;
1139                 request->coa = NULL;
1140         }
1141 #endif
1142
1143         switch (request->child_state) {
1144         case REQUEST_QUEUED:
1145         case REQUEST_RUNNING:
1146                 when = request->received;
1147                 when.tv_sec += request->root->max_request_time;
1148
1149                 /*
1150                  *      Normally called from the event loop with the
1151                  *      proper event loop time.  Otherwise, called from
1152                  *      post proxy fail handler, which sets "now", and
1153                  *      this call won't re-set it, because we're not
1154                  *      in the event loop.
1155                  */
1156                 fr_event_now(el, &now);
1157
1158                 /*
1159                  *      Request still has more time.  Continue
1160                  *      waiting.
1161                  */
1162                 if (timercmp(&now, &when, <) ||
1163                     ((request->listener->type == RAD_LISTEN_DETAIL) &&
1164                      (request->child_state == REQUEST_QUEUED))) {
1165                         if (request->delay < (USEC / 10)) {
1166                                 request->delay = USEC / 10;
1167                         }
1168                         request->delay += request->delay >> 1;
1169
1170 #ifdef WITH_DETAIL
1171                         /*
1172                          *      Cap wait at some sane value for detail
1173                          *      files.
1174                          */
1175                         if ((request->listener->type == RAD_LISTEN_DETAIL) &&
1176                             (request->delay > (request->root->max_request_time * USEC))) {
1177                                 request->delay = request->root->max_request_time * USEC;
1178                         }
1179 #endif
1180
1181                         request->when = now;
1182                         tv_add(&request->when, request->delay);
1183                         callback = wait_a_bit;
1184                         break;
1185                 }
1186
1187 #if defined(HAVE_PTHREAD_H) || defined(WITH_PROXY)
1188                 /*
1189                  *      A child thread MAY still be running on the
1190                  *      request.  Ask the thread to stop working on
1191                  *      the request.
1192                  */
1193                 if (have_children) {
1194                         /* FIXME: kill unresponsive children? */
1195
1196                         /*
1197                          *      Print this error message ONLY if
1198                          *      there's a child currently processing
1199                          *      the request.  As we don't have thread
1200                          *      locks here, there may be race
1201                          *      conditions on this check.  But it's
1202                          *      just an error message, so that's OK.
1203                          */
1204                         if (!pthread_equal(request->child_pid, NO_SUCH_CHILD_PID)) {
1205                                 radlog(L_ERR, "WARNING: Unresponsive child for request %d, in module %s component %s",
1206                                        request->number,
1207                                        request->module ? request->module : "<server core>",
1208                                        request->component ? request->component : "<server core>");
1209                         }
1210
1211                 stop_processing:
1212                         request->master_state = REQUEST_STOP_PROCESSING;
1213
1214                         request->delay = USEC / 4;
1215                         tv_add(&request->when, request->delay);
1216                         callback = wait_for_child_to_die;
1217                         break;
1218                 }
1219 #else  /* no child threads */
1220         stop_processing:
1221 #endif
1222
1223                 /*
1224                  *      Else there are no child threads.  We probably
1225                  *      should have just marked the request as 'done'
1226                  *      elsewhere, like in the post-proxy-fail
1227                  *      handler.  But doing that would involve
1228                  *      checking for max_request_time in multiple
1229                  *      places, so this may be simplest.
1230                  */
1231                 request->child_state = REQUEST_DONE;
1232                 /* FALL-THROUGH */
1233
1234                 /*
1235                  *      Mark the request as no longer running,
1236                  *      and clean it up.
1237                  */
1238         case REQUEST_DONE:
1239 #ifdef HAVE_PTHREAD_H
1240                 request->child_pid = NO_SUCH_CHILD_PID;
1241 #endif
1242
1243 #ifdef WTH_COA
1244                 /*
1245                  *      This is a CoA request.  It's been divorced
1246                  *      from everything else, so we clean it up now.
1247                  */
1248                 if (!request->in_request_hash &&
1249                     request->proxy &&
1250                     (request->packet->code != request->proxy->code) &&
1251                     ((request->proxy->code == PW_COA_REQUEST) ||
1252                      (request->proxy->code == PW_DISCONNECT_REQUEST))) {
1253                         /*
1254                          *      FIXME: Do CoA MIBs
1255                          */
1256                         ev_request_free(&request);
1257                         return;
1258                 }
1259 #endif
1260                 request_stats_final(request);
1261                 cleanup_delay(request);
1262                 return;
1263
1264         case REQUEST_REJECT_DELAY:
1265         case REQUEST_CLEANUP_DELAY:
1266 #ifdef HAVE_PTHREAD_H
1267                 request->child_pid = NO_SUCH_CHILD_PID;
1268 #endif
1269                 request_stats_final(request);
1270
1271         case REQUEST_PROXIED:
1272                 rad_assert(request->next_callback != NULL);
1273                 rad_assert(request->next_callback != wait_a_bit);
1274
1275                 request->when = request->next_when;
1276                 callback = request->next_callback;
1277                 request->next_callback = NULL;
1278                 break;
1279
1280         default:
1281                 rad_panic("Internal sanity check failure");
1282                 return;
1283         }
1284
1285         /*
1286          *      Something major went wrong.  Discard the request, and
1287          *      keep running.
1288          *
1289          *      FIXME: No idea why this happens or how to fix it...
1290          *      It seems to happen *only* when requests are proxied,
1291          *      and where the home server doesn't respond.  So it looks
1292          *      like a race condition above, but it happens in debug
1293          *      mode, with no threads...
1294          */
1295         if (!callback) {
1296                 RDEBUG("WARNING: Internal sanity check failed in event handler for request %d: Discarding the request!", request->number);
1297                 ev_request_free(&request);
1298                 return;
1299         }
1300
1301         INSERT_EVENT(callback, request);
1302 }
1303
1304 #ifdef WITH_COA
1305 static void no_response_to_coa_request(void *ctx)
1306 {
1307         REQUEST *request = ctx;
1308         char buffer[128];
1309
1310         rad_assert(request->magic == REQUEST_MAGIC);
1311         rad_assert(request->child_state == REQUEST_PROXIED);
1312         rad_assert(request->home_server != NULL);
1313         rad_assert(!request->in_request_hash);
1314
1315         radlog(L_ERR, "No response to CoA request sent to %s",
1316                inet_ntop(request->proxy->dst_ipaddr.af,
1317                          &request->proxy->dst_ipaddr.ipaddr,
1318                          buffer, sizeof(buffer)));
1319
1320         /*
1321          *      Hack.
1322          */
1323         request->packet->code |= (PW_COA_REQUEST << 8);
1324         post_proxy_fail_handler(request);
1325 }
1326
1327
1328 static int update_event_timestamp(RADIUS_PACKET *packet, time_t when)
1329 {
1330         VALUE_PAIR *vp;
1331
1332         vp = pairfind(packet->vps, PW_EVENT_TIMESTAMP);
1333         if (!vp) return 0;
1334
1335         vp->vp_date = when;
1336
1337         if (packet->data) {
1338                 free(packet->data);
1339                 packet->data = NULL;
1340                 packet->data_len = 0;
1341         }
1342
1343         return 1;               /* time stamp updated */
1344 }
1345
1346
1347 /*
1348  *      Called when we haven't received a response to a CoA request.
1349  */
1350 static void retransmit_coa_request(void *ctx)
1351 {
1352         int delay, frac;
1353         struct timeval mrd;
1354         REQUEST *request = ctx;
1355
1356         rad_assert(request->magic == REQUEST_MAGIC);
1357         rad_assert(request->child_state == REQUEST_PROXIED);
1358         rad_assert(request->home_server != NULL);
1359         rad_assert(!request->in_request_hash);
1360         rad_assert(request->parent == NULL);
1361
1362         fr_event_now(el, &now);
1363
1364         /*
1365          *      Cap count at MRC, if it is non-zero.
1366          */
1367         if (request->home_server->coa_mrc &&
1368             (request->num_coa_requests >= request->home_server->coa_mrc)) {
1369                 no_response_to_coa_request(request);
1370                 return;
1371         }
1372
1373         /*
1374          *      RFC 5080 Section 2.2.1
1375          *
1376          *      RT = 2*RTprev + RAND*RTprev
1377          *         = 1.9 * RTprev + rand(0,.2) * RTprev
1378          *         = 1.9 * RTprev + rand(0,1) * (RTprev / 5)
1379          */
1380         delay = fr_rand();
1381         delay ^= (delay >> 16);
1382         delay &= 0xffff;
1383         frac = request->delay / 5;
1384         delay = ((frac >> 16) * delay) + (((frac & 0xffff) * delay) >> 16);
1385
1386         delay += (2 * request->delay) - (request->delay / 10);
1387
1388         /*
1389          *      Cap delay at MRT, if MRT is non-zero.
1390          */
1391         if (request->home_server->coa_mrt &&
1392             (delay > (request->home_server->coa_mrt * USEC))) {
1393                 int mrt_usec = request->home_server->coa_mrt * USEC;
1394
1395                 /*
1396                  *      delay = MRT + RAND * MRT
1397                  *            = 0.9 MRT + rand(0,.2)  * MRT
1398                  */
1399                 delay = fr_rand();
1400                 delay ^= (delay >> 15);
1401                 delay &= 0x1ffff;
1402                 delay = ((mrt_usec >> 16) * delay) + (((mrt_usec & 0xffff) * delay) >> 16);
1403                 delay += mrt_usec - (mrt_usec / 10);
1404         }
1405
1406         request->delay = delay;
1407         request->when = now;
1408         tv_add(&request->when, request->delay);
1409         mrd = request->proxy_when;
1410         mrd.tv_sec += request->home_server->coa_mrd;
1411
1412         /*
1413          *      Cap duration at MRD.
1414          */
1415         if (timercmp(&mrd, &request->when, <)) {
1416                 request->when = mrd;
1417                 INSERT_EVENT(no_response_to_coa_request, request);
1418
1419         } else {
1420                 INSERT_EVENT(retransmit_coa_request, request);
1421         }
1422
1423         if (update_event_timestamp(request->proxy, now.tv_sec)) {
1424                 if (!insert_into_proxy_hash(request, TRUE)) {
1425                         DEBUG("ERROR: Failed re-inserting CoA request into proxy hash.");
1426                         return;
1427                 }
1428
1429                 request->num_proxied_requests = 0;
1430                 request->num_proxied_responses = 0;
1431         }
1432
1433         request->num_proxied_requests++;
1434         request->num_coa_requests++; /* is NOT reset by code 3 lines above! */
1435
1436         request->proxy_listener->send(request->proxy_listener,
1437                                       request);
1438 }
1439
1440
1441 /*
1442  *      The original request is either DONE, or in CLEANUP_DELAY.
1443  */
1444 static int originated_coa_request(REQUEST *request)
1445 {
1446         int delay, rcode, pre_proxy_type = 0;
1447         VALUE_PAIR *vp;
1448         REQUEST *coa;
1449         fr_ipaddr_t ipaddr;
1450         char buffer[256];
1451
1452         rad_assert(request->proxy == NULL);
1453         rad_assert(!request->in_proxy_hash);
1454         rad_assert(request->proxy_reply == NULL);
1455
1456         vp = pairfind(request->config_items, PW_SEND_COA_REQUEST);
1457         if (!vp && request->coa) vp = pairfind(request->coa->proxy->vps, PW_SEND_COA_REQUEST);
1458         if (vp) {
1459                 if (vp->vp_integer == 0) {
1460                         ev_request_free(&request->coa);
1461                         return 1;       /* success */
1462                 }
1463
1464                 if (!request->coa) request_alloc_coa(request);
1465                 if (!request->coa) return 0;
1466         }
1467
1468         coa = request->coa;
1469
1470         /*
1471          *      src_ipaddr will be set up in proxy_encode.
1472          */
1473         memset(&ipaddr, 0, sizeof(ipaddr));
1474         vp = pairfind(coa->proxy->vps, PW_PACKET_DST_IP_ADDRESS);
1475         if (vp) {
1476                 ipaddr.af = AF_INET;
1477                 ipaddr.ipaddr.ip4addr.s_addr = vp->vp_ipaddr;
1478
1479         } else if ((vp = pairfind(coa->proxy->vps,
1480                                   PW_PACKET_DST_IPV6_ADDRESS)) != NULL) {
1481                 ipaddr.af = AF_INET6;
1482                 ipaddr.ipaddr.ip6addr = vp->vp_ipv6addr;
1483
1484         } else if ((vp = pairfind(coa->proxy->vps,
1485                                   PW_HOME_SERVER_POOL)) != NULL) {
1486                 coa->home_pool = home_pool_byname(vp->vp_strvalue,
1487                                                   HOME_TYPE_COA);
1488                 if (!coa->home_pool) {
1489                         RDEBUG2("WARNING: No such home_server_pool %s",
1490                                vp->vp_strvalue);
1491         fail:
1492                         ev_request_free(&request->coa);
1493                         return 0;
1494                 }
1495
1496                 /*
1497                  *      Prefer
1498                  */
1499         } else if (request->client->coa_pool) {
1500                 coa->home_pool = request->client->coa_pool;
1501
1502         } else if (request->client->coa_server) {
1503                 coa->home_server = request->client->coa_server;
1504
1505         } else {
1506                 /*
1507                  *      If all else fails, send it to the client that
1508                  *      originated this request.
1509                  */
1510                 memcpy(&ipaddr, &request->packet->src_ipaddr, sizeof(ipaddr));
1511         }
1512
1513         /*
1514          *      Use the pool, if it exists.
1515          */
1516         if (coa->home_pool) {
1517                 coa->home_server = home_server_ldb(NULL, coa->home_pool, coa);
1518                 if (!coa->home_server) {
1519                         RDEBUG("WARNING: No live home server for home_server_pool %s", vp->vp_strvalue);
1520                         goto fail;
1521                 }
1522
1523         } else if (!coa->home_server) {
1524                 int port = PW_COA_UDP_PORT;
1525
1526                 vp = pairfind(coa->proxy->vps, PW_PACKET_DST_PORT);
1527                 if (vp) port = vp->vp_integer;
1528
1529                 coa->home_server = home_server_find(&ipaddr, port);
1530                 if (!coa->home_server) {
1531                         RDEBUG2("WARNING: Unknown destination %s:%d for CoA request.",
1532                                inet_ntop(ipaddr.af, &ipaddr.ipaddr,
1533                                          buffer, sizeof(buffer)), port);
1534                         goto fail;
1535                 }
1536         }
1537
1538         vp = pairfind(coa->proxy->vps, PW_PACKET_TYPE);
1539         if (vp) {
1540                 switch (vp->vp_integer) {
1541                 case PW_COA_REQUEST:
1542                 case PW_DISCONNECT_REQUEST:
1543                         coa->proxy->code = vp->vp_integer;
1544                         break;
1545
1546                 default:
1547                         DEBUG("Cannot set CoA Packet-Type to code %d",
1548                               vp->vp_integer);
1549                         goto fail;
1550                 }
1551         }
1552
1553         if (!coa->proxy->code) coa->proxy->code = PW_COA_REQUEST;
1554
1555         /*
1556          *      The rest of the server code assumes that
1557          *      request->packet && request->reply exist.  Copy them
1558          *      from the original request.
1559          */
1560         rad_assert(coa->packet != NULL);
1561         rad_assert(coa->packet->vps == NULL);
1562         memcpy(coa->packet, request->packet, sizeof(*request->packet));
1563         coa->packet->vps = paircopy(request->packet->vps);
1564         coa->packet->data = NULL;
1565         rad_assert(coa->reply != NULL);
1566         rad_assert(coa->reply->vps == NULL);
1567         memcpy(coa->reply, request->reply, sizeof(*request->reply));
1568         coa->reply->vps = paircopy(request->reply->vps);
1569         coa->reply->data = NULL;
1570         coa->config_items = paircopy(request->config_items);
1571
1572         /*
1573          *      Call the pre-proxy routines.
1574          */
1575         vp = pairfind(request->config_items, PW_PRE_PROXY_TYPE);
1576         if (vp) {
1577                 RDEBUG2("  Found Pre-Proxy-Type %s", vp->vp_strvalue);
1578                 pre_proxy_type = vp->vp_integer;
1579         }
1580
1581         if (coa->home_pool && coa->home_pool->virtual_server) {
1582                 const char *old_server = coa->server;
1583
1584                 coa->server = coa->home_pool->virtual_server;
1585                 RDEBUG2(" server %s {", coa->server);
1586                 rcode = module_pre_proxy(pre_proxy_type, coa);
1587                 RDEBUG2(" }");
1588                 coa->server = old_server;
1589         } else {
1590                 rcode = module_pre_proxy(pre_proxy_type, coa);
1591         }
1592         switch (rcode) {
1593         default:
1594                 goto fail;
1595
1596         /*
1597          *      Only send the CoA packet if the pre-proxy code succeeded.
1598          */
1599         case RLM_MODULE_NOOP:
1600         case RLM_MODULE_OK:
1601         case RLM_MODULE_UPDATED:
1602                 break;
1603         }
1604
1605         /*
1606          *      Source IP / port is set when the proxy socket
1607          *      is chosen.
1608          */
1609         coa->proxy->dst_ipaddr = coa->home_server->ipaddr;
1610         coa->proxy->dst_port = coa->home_server->port;
1611
1612         if (!insert_into_proxy_hash(coa, FALSE)) {
1613                 DEBUG("ERROR: Failed inserting CoA request into proxy hash.");
1614                 goto fail;
1615         }
1616
1617         /*
1618          *      We CANNOT divorce the CoA request from the parent
1619          *      request.  This function is running in a child thread,
1620          *      and we need access to the main event loop in order to
1621          *      to add the timers for the CoA packet.  See
1622          *      wait_a_bit().
1623          */
1624
1625         /*
1626          *      Forget about the original request completely at this
1627          *      point.
1628          */
1629         request = coa;
1630
1631         gettimeofday(&request->proxy_when, NULL);
1632         request->received = request->next_when = request->proxy_when;
1633         rad_assert(request->proxy_reply == NULL);
1634
1635         /*
1636          *      Implement re-transmit algorithm as per RFC 5080
1637          *      Section 2.2.1.
1638          *
1639          *      We want IRT + RAND*IRT
1640          *      or 0.9 IRT + rand(0,.2) IRT
1641          *
1642          *      2^20 ~ USEC, and we want 2.
1643          *      rand(0,0.2) USEC ~ (rand(0,2^21) / 10)
1644          */
1645         delay = (fr_rand() & ((1 << 22) - 1)) / 10;
1646         request->delay = delay * request->home_server->coa_irt;
1647         delay = request->home_server->coa_irt * USEC;
1648         delay -= delay / 10;
1649         delay += request->delay;
1650
1651         request->delay = delay;
1652         tv_add(&request->next_when, delay);
1653         request->next_callback = retransmit_coa_request;
1654
1655         /*
1656          *      Note that we set proxied BEFORE sending the packet.
1657          *
1658          *      Once we send it, the request is tainted, as
1659          *      another thread may have picked it up.  Don't
1660          *      touch it!
1661          */
1662         request->num_proxied_requests = 1;
1663         request->num_proxied_responses = 0;
1664         request->child_pid = NO_SUCH_CHILD_PID;
1665
1666         update_event_timestamp(request->proxy, request->proxy_when.tv_sec);
1667
1668         request->child_state = REQUEST_PROXIED;
1669
1670         DEBUG_PACKET(request, request->proxy, 1);
1671
1672         request->proxy_listener->send(request->proxy_listener,
1673                                       request);
1674         return 1;
1675 }
1676 #endif  /* WITH_COA */
1677
1678 #ifdef WITH_PROXY
1679 static int process_proxy_reply(REQUEST *request)
1680 {
1681         int rcode;
1682         int post_proxy_type = 0;
1683         VALUE_PAIR *vp;
1684
1685         /*
1686          *      Delete any reply we had accumulated until now.
1687          */
1688         pairfree(&request->reply->vps);
1689
1690         /*
1691          *      Run the packet through the post-proxy stage,
1692          *      BEFORE playing games with the attributes.
1693          */
1694         vp = pairfind(request->config_items, PW_POST_PROXY_TYPE);
1695         if (vp) {
1696                 RDEBUG2("  Found Post-Proxy-Type %s", vp->vp_strvalue);
1697                 post_proxy_type = vp->vp_integer;
1698         }
1699
1700         if (request->home_pool && request->home_pool->virtual_server) {
1701                 const char *old_server = request->server;
1702
1703                 request->server = request->home_pool->virtual_server;
1704                 RDEBUG2(" server %s {", request->server);
1705                 rcode = module_post_proxy(post_proxy_type, request);
1706                 RDEBUG2(" }");
1707                 request->server = old_server;
1708         } else {
1709                 rcode = module_post_proxy(post_proxy_type, request);
1710         }
1711
1712 #ifdef WITH_COA
1713         if (request->packet->code == request->proxy->code)
1714           /*
1715            *    Don't run the next bit if we originated a CoA
1716            *    packet, after receiving an Access-Request or
1717            *    Accounting-Request.
1718            */
1719 #endif
1720
1721         /*
1722          *      There may NOT be a proxy reply, as we may be
1723          *      running Post-Proxy-Type = Fail.
1724          */
1725         if (request->proxy_reply) {
1726                 /*
1727                  *      Delete the Proxy-State Attributes from
1728                  *      the reply.  These include Proxy-State
1729                  *      attributes from us and remote server.
1730                  */
1731                 pairdelete(&request->proxy_reply->vps, PW_PROXY_STATE);
1732
1733                 /*
1734                  *      Add the attributes left in the proxy
1735                  *      reply to the reply list.
1736                  */
1737                 pairadd(&request->reply->vps, request->proxy_reply->vps);
1738                 request->proxy_reply->vps = NULL;
1739
1740                 /*
1741                  *      Free proxy request pairs.
1742                  */
1743                 pairfree(&request->proxy->vps);
1744         }
1745
1746         switch (rcode) {
1747         default:  /* Don't do anything */
1748                 break;
1749         case RLM_MODULE_FAIL:
1750                 /* FIXME: debug print stuff */
1751                 request->child_state = REQUEST_DONE;
1752                 return 0;
1753
1754         case RLM_MODULE_HANDLED:
1755                 /* FIXME: debug print stuff */
1756                 request->child_state = REQUEST_DONE;
1757                 return 0;
1758         }
1759
1760         return 1;
1761 }
1762 #endif
1763
1764 #ifdef WITH_TCP
1765 static void tcp_socket_lifetime(void *ctx)
1766 {
1767         rad_listen_t *listener = ctx;
1768
1769         DEBUG("Reached lifetime on outgoing connection to home server");
1770         proxy_close_tcp_listener(listener);
1771 }
1772
1773 static void tcp_idle_timeout(void *ctx)
1774 {
1775         rad_listen_t *listener = ctx;
1776         fr_tcp_radius_t *tcp = fr_listen2tcp(listener);
1777
1778         /*
1779          *      Rather than adding && deleting the timer when "used"
1780          *      changes from 1->0, or from 0->1, we just add it when
1781          *      "used" reaches zero, and don't touch it after that.
1782          *      However, in order to avoid deleting used sockets, we
1783          *      double-check things here.
1784          */
1785         if (tcp->used != 0) {
1786                 /*
1787                  *      If it's NOT idle, we still need to enforce
1788                  *      maximum lifetime.
1789                  */
1790                 if (tcp->lifetime > 0) {
1791                                 struct timeval when;
1792
1793                                 when.tv_sec = tcp->opened;
1794                                 when.tv_sec += tcp->lifetime;
1795                                 when.tv_usec = fr_rand() & 0xffff;
1796
1797                                 fr_event_insert(el, tcp_socket_lifetime,
1798                                                 listener,
1799                                                 &when, (fr_event_t **) &tcp->ev);
1800                 }
1801                 return;
1802         }
1803
1804
1805         DEBUG("Reasched idle timeout on outgoing connection to home server");
1806         proxy_close_tcp_listener(listener);
1807 }
1808 #endif
1809
1810
1811 static int request_pre_handler(REQUEST *request)
1812 {
1813         int rcode;
1814
1815         rad_assert(request->magic == REQUEST_MAGIC);
1816         rad_assert(request->packet != NULL);
1817
1818         request->child_state = REQUEST_RUNNING;
1819
1820         /*
1821          *      Don't decode the packet if it's an internal "fake"
1822          *      request.  Instead, just return so that the caller can
1823          *      process it.
1824          */
1825         if (request->packet->dst_port == 0) {
1826                 request->username = pairfind(request->packet->vps,
1827                                              PW_USER_NAME);
1828                 request->password = pairfind(request->packet->vps,
1829                                              PW_USER_PASSWORD);
1830                 return 1;
1831         }
1832
1833 #ifdef WITH_PROXY
1834         /*
1835          *      Put the decoded packet into it's proper place.
1836          */
1837         if (request->proxy_reply != NULL) {
1838                 rcode = request->proxy_listener->decode(request->proxy_listener,
1839                                                         request);
1840                 DEBUG_PACKET(request, request->proxy_reply, 0);
1841         } else
1842 #endif
1843         if (request->packet->vps == NULL) {
1844                 rcode = request->listener->decode(request->listener, request);
1845
1846                 if (debug_condition) {
1847                         int result = FALSE;
1848                         const char *my_debug = debug_condition;
1849
1850                         /*
1851                          *      Ignore parse errors.
1852                          */
1853                         radius_evaluate_condition(request, RLM_MODULE_OK, 0,
1854                                                   &my_debug, 1,
1855                                                   &result);
1856                         if (result) {
1857                                 request->options = 2;
1858                                 request->radlog = radlog_request;
1859                         }
1860                 }
1861
1862                 DEBUG_PACKET(request, request->packet, 0);
1863         } else {
1864                 rcode = 0;
1865         }
1866
1867         if (rcode < 0) {
1868                 radlog(L_ERR, "%s Dropping packet without response.", fr_strerror());
1869                 request->child_state = REQUEST_DONE;
1870                 return 0;
1871         }
1872
1873         if (!request->username) {
1874                 request->username = pairfind(request->packet->vps,
1875                                              PW_USER_NAME);
1876         }
1877
1878 #ifdef WITH_PROXY
1879         if (request->proxy) {
1880                 return process_proxy_reply(request);
1881 #endif
1882         }
1883
1884         return 1;
1885 }
1886
1887
1888 #ifdef WITH_PROXY
1889 /*
1890  *      Do state handling when we proxy a request.
1891  */
1892 static int proxy_request(REQUEST *request)
1893 {
1894         struct timeval when;
1895         char buffer[128];
1896
1897         if (request->home_server->server) {
1898                 RDEBUG("ERROR: Cannot perform real proxying to a virtual server.");
1899                 return 0;
1900         }
1901
1902         if (!insert_into_proxy_hash(request, FALSE)) {
1903                 RDEBUG("ERROR: Failed inserting request into proxy hash.");
1904                 return 0;
1905         }
1906
1907         request->proxy_listener->encode(request->proxy_listener, request);
1908
1909         when = request->received;
1910         when.tv_sec += request->root->max_request_time;
1911
1912         gettimeofday(&request->proxy_when, NULL);
1913
1914         request->next_when = request->proxy_when;
1915         request->next_when.tv_sec += request->home_server->response_window;
1916
1917         rad_assert(request->home_server->response_window > 0);
1918
1919         if (timercmp(&when, &request->next_when, <)) {
1920                 request->next_when = when;
1921         }
1922         request->next_callback = no_response_to_proxied_request;
1923
1924         RDEBUG2("Proxying request %d to home server %s port %d",
1925                request->number,
1926                inet_ntop(request->proxy->dst_ipaddr.af,
1927                          &request->proxy->dst_ipaddr.ipaddr,
1928                          buffer, sizeof(buffer)),
1929                request->proxy->dst_port);
1930
1931         /*
1932          *      Note that we set proxied BEFORE sending the packet.
1933          *
1934          *      Once we send it, the request is tainted, as
1935          *      another thread may have picked it up.  Don't
1936          *      touch it!
1937          */
1938         request->num_proxied_requests = 1;
1939         request->num_proxied_responses = 0;
1940 #ifdef HAVE_PTHREAD_H
1941         request->child_pid = NO_SUCH_CHILD_PID;
1942 #endif
1943         request->child_state = REQUEST_PROXIED;
1944
1945         DEBUG_PACKET(request, request->proxy, 1);
1946
1947         request->proxy_listener->send(request->proxy_listener,
1948                                       request);
1949         return 1;
1950 }
1951
1952
1953 /*
1954  *      "Proxy" the request by sending it to a new virtual server.
1955  */
1956 static int proxy_to_virtual_server(REQUEST *request)
1957 {
1958         REQUEST *fake;
1959         RAD_REQUEST_FUNP fun;
1960
1961         if (!request->home_server || !request->home_server->server) return 0;
1962
1963         if (request->parent) {
1964                 RDEBUG2("WARNING: Cancelling proxy request to virtual server %s as this request was itself proxied.", request->home_server->server);
1965                 return 0;
1966         }
1967
1968         fake = request_alloc_fake(request);
1969         if (!fake) {
1970                 RDEBUG2("WARNING: Out of memory");
1971                 return 0;
1972         }
1973
1974         fake->packet->vps = paircopy(request->proxy->vps);
1975         fake->server = request->home_server->server;
1976
1977         if (request->proxy->code == PW_AUTHENTICATION_REQUEST) {
1978                 fun = rad_authenticate;
1979
1980 #ifdef WITH_ACCOUNTING
1981         } else if (request->proxy->code == PW_ACCOUNTING_REQUEST) {
1982                 fun = rad_accounting;
1983 #endif
1984
1985         } else {
1986                 RDEBUG2("Unknown packet type %d", request->proxy->code);
1987                 ev_request_free(&fake);
1988                 return 0;
1989         }
1990
1991         RDEBUG2(">>> Sending proxied request internally to virtual server.");
1992         radius_handle_request(fake, fun);
1993         RDEBUG2("<<< Received proxied response code %d from internal virtual server.", fake->reply->code);
1994
1995         if (fake->reply->code != 0) {
1996                 request->proxy_reply = fake->reply;
1997                 fake->reply = NULL;
1998         } else {
1999                 /*
2000                  *      There was no response
2001                  */
2002                 setup_post_proxy_fail(request);
2003         }
2004
2005         ev_request_free(&fake);
2006
2007         process_proxy_reply(request);
2008
2009         /*
2010          *      Process it through the normal section again, but ONLY
2011          *      if we received a proxy reply..
2012          */
2013         if (request->proxy_reply) {
2014                 if (request->server) RDEBUG("server %s {",
2015                                             request->server != NULL ?
2016                                             request->server : "");
2017                 fun(request);
2018
2019                 if (request->server) RDEBUG("} # server %s",
2020                                             request->server != NULL ?
2021                                             request->server : "");
2022         }
2023
2024         return 2;               /* success, but NOT '1' !*/
2025 }
2026
2027 /*
2028  *      Return 1 if we did proxy it, or the proxy attempt failed
2029  *      completely.  Either way, the caller doesn't touch the request
2030  *      any more if we return 1.
2031  */
2032 static int successfully_proxied_request(REQUEST *request)
2033 {
2034         int rcode;
2035         int pre_proxy_type = 0;
2036         VALUE_PAIR *realmpair;
2037         VALUE_PAIR *strippedname;
2038         VALUE_PAIR *vp;
2039         char *realmname = NULL;
2040         home_server *home;
2041         REALM *realm = NULL;
2042         home_pool_t *pool;
2043
2044         /*
2045          *      If it was already proxied, do nothing.
2046          *
2047          *      FIXME: This should really be a serious error.
2048          */
2049         if (request->in_proxy_hash ||
2050             (request->proxy_reply && (request->proxy_reply->code != 0))) {
2051                 return 0;
2052         }
2053
2054         realmpair = pairfind(request->config_items, PW_PROXY_TO_REALM);
2055         if (!realmpair || (realmpair->length == 0)) {
2056                 int pool_type;
2057
2058                 vp = pairfind(request->config_items, PW_HOME_SERVER_POOL);
2059                 if (!vp) return 0;
2060
2061                 switch (request->packet->code) {
2062                 case PW_AUTHENTICATION_REQUEST:
2063                         pool_type = HOME_TYPE_AUTH;
2064                         break;
2065
2066 #ifdef WITH_ACCOUNTING
2067                 case PW_ACCOUNTING_REQUEST:
2068                         pool_type = HOME_TYPE_ACCT;
2069                         break;
2070 #endif
2071
2072 #ifdef WITH_COA
2073                 case PW_COA_REQUEST:
2074                 case PW_DISCONNECT_REQUEST:
2075                         pool_type = HOME_TYPE_COA;
2076                         break;
2077 #endif
2078
2079                 default:
2080                         return 0;
2081                 }
2082
2083                 pool = home_pool_byname(vp->vp_strvalue, pool_type);
2084                 if (!pool) {
2085                         RDEBUG2("ERROR: Cannot proxy to unknown pool %s",
2086                                 vp->vp_strvalue);
2087                         return 0;
2088                 }
2089
2090                 realmname = NULL; /* no realms */
2091                 realm = NULL;
2092                 goto found_pool;
2093         }
2094
2095         realmname = (char *) realmpair->vp_strvalue;
2096
2097         realm = realm_find2(realmname);
2098         if (!realm) {
2099                 RDEBUG2("ERROR: Cannot proxy to unknown realm %s", realmname);
2100                 return 0;
2101         }
2102
2103         /*
2104          *      Figure out which pool to use.
2105          */
2106         if (request->packet->code == PW_AUTHENTICATION_REQUEST) {
2107                 pool = realm->auth_pool;
2108
2109 #ifdef WITH_ACCOUNTING
2110         } else if (request->packet->code == PW_ACCOUNTING_REQUEST) {
2111                 pool = realm->acct_pool;
2112 #endif
2113
2114 #ifdef WITH_COA
2115         } else if ((request->packet->code == PW_COA_REQUEST) ||
2116                    (request->packet->code == PW_DISCONNECT_REQUEST)) {
2117                 pool = realm->acct_pool;
2118 #endif
2119
2120         } else {
2121                 rad_panic("Internal sanity check failed");
2122         }
2123
2124         if (!pool) {
2125                 RDEBUG2(" WARNING: Cancelling proxy to Realm %s, as the realm is local.",
2126                        realmname);
2127                 return 0;
2128         }
2129
2130 found_pool:
2131         home = home_server_ldb(realmname, pool, request);
2132         if (!home) {
2133                 RDEBUG2("ERROR: Failed to find live home server for realm %s",
2134                        realmname);
2135                 return -1;
2136         }
2137         request->home_pool = pool;
2138
2139 #ifdef WITH_COA
2140         /*
2141          *      Once we've decided to proxy a request, we cannot send
2142          *      a CoA packet.  So we free up any CoA packet here.
2143          */
2144         ev_request_free(&request->coa);
2145 #endif
2146         /*
2147          *      Remember that we sent the request to a Realm.
2148          */
2149         if (realmname) pairadd(&request->packet->vps,
2150                                pairmake("Realm", realmname, T_OP_EQ));
2151
2152         /*
2153          *      Strip the name, if told to.
2154          *
2155          *      Doing it here catches the case of proxied tunneled
2156          *      requests.
2157          */
2158         if (realm && (realm->striprealm == TRUE) &&
2159            (strippedname = pairfind(request->proxy->vps, PW_STRIPPED_USER_NAME)) != NULL) {
2160                 /*
2161                  *      If there's a Stripped-User-Name attribute in
2162                  *      the request, then use THAT as the User-Name
2163                  *      for the proxied request, instead of the
2164                  *      original name.
2165                  *
2166                  *      This is done by making a copy of the
2167                  *      Stripped-User-Name attribute, turning it into
2168                  *      a User-Name attribute, deleting the
2169                  *      Stripped-User-Name and User-Name attributes
2170                  *      from the vps list, and making the new
2171                  *      User-Name the head of the vps list.
2172                  */
2173                 vp = pairfind(request->proxy->vps, PW_USER_NAME);
2174                 if (!vp) {
2175                         vp = radius_paircreate(request, NULL,
2176                                                PW_USER_NAME, PW_TYPE_STRING);
2177                         rad_assert(vp != NULL); /* handled by above function */
2178                         /* Insert at the START of the list */
2179                         vp->next = request->proxy->vps;
2180                         request->proxy->vps = vp;
2181                 }
2182                 memcpy(vp->vp_strvalue, strippedname->vp_strvalue,
2183                        sizeof(vp->vp_strvalue));
2184                 vp->length = strippedname->length;
2185
2186                 /*
2187                  *      Do NOT delete Stripped-User-Name.
2188                  */
2189         }
2190
2191         /*
2192          *      If there is no PW_CHAP_CHALLENGE attribute but
2193          *      there is a PW_CHAP_PASSWORD we need to add it
2194          *      since we can't use the request authenticator
2195          *      anymore - we changed it.
2196          */
2197         if ((request->packet->code == PW_AUTHENTICATION_REQUEST) &&
2198             pairfind(request->proxy->vps, PW_CHAP_PASSWORD) &&
2199             pairfind(request->proxy->vps, PW_CHAP_CHALLENGE) == NULL) {
2200                 vp = radius_paircreate(request, &request->proxy->vps,
2201                                        PW_CHAP_CHALLENGE, PW_TYPE_OCTETS);
2202                 vp->length = AUTH_VECTOR_LEN;
2203                 memcpy(vp->vp_strvalue, request->packet->vector, AUTH_VECTOR_LEN);
2204         }
2205
2206         /*
2207          *      The RFC's say we have to do this, but FreeRADIUS
2208          *      doesn't need it.
2209          */
2210         vp = radius_paircreate(request, &request->proxy->vps,
2211                                PW_PROXY_STATE, PW_TYPE_OCTETS);
2212         snprintf(vp->vp_strvalue, sizeof(vp->vp_strvalue), "%d",
2213                  request->packet->id);
2214         vp->length = strlen(vp->vp_strvalue);
2215
2216         /*
2217          *      Should be done BEFORE inserting into proxy hash, as
2218          *      pre-proxy may use this information, or change it.
2219          */
2220         request->proxy->code = request->packet->code;
2221
2222         /*
2223          *      Call the pre-proxy routines.
2224          */
2225         vp = pairfind(request->config_items, PW_PRE_PROXY_TYPE);
2226         if (vp) {
2227                 RDEBUG2("  Found Pre-Proxy-Type %s", vp->vp_strvalue);
2228                 pre_proxy_type = vp->vp_integer;
2229         }
2230
2231         rad_assert(request->home_pool != NULL);
2232
2233         if (request->home_pool->virtual_server) {
2234                 const char *old_server = request->server;
2235
2236                 request->server = request->home_pool->virtual_server;
2237                 RDEBUG2(" server %s {", request->server);
2238                 rcode = module_pre_proxy(pre_proxy_type, request);
2239                 RDEBUG2(" }");
2240                         request->server = old_server;
2241         } else {
2242                 rcode = module_pre_proxy(pre_proxy_type, request);
2243         }
2244         switch (rcode) {
2245         case RLM_MODULE_FAIL:
2246         case RLM_MODULE_INVALID:
2247         case RLM_MODULE_NOTFOUND:
2248         case RLM_MODULE_USERLOCK:
2249         default:
2250                 /* FIXME: debug print failed stuff */
2251                 return -1;
2252
2253         case RLM_MODULE_REJECT:
2254         case RLM_MODULE_HANDLED:
2255                 return 0;
2256
2257         /*
2258          *      Only proxy the packet if the pre-proxy code succeeded.
2259          */
2260         case RLM_MODULE_NOOP:
2261         case RLM_MODULE_OK:
2262         case RLM_MODULE_UPDATED:
2263                 break;
2264         }
2265
2266         /*
2267          *      If it's a fake request, don't send the proxy
2268          *      packet.  The outer tunnel session will take
2269          *      care of doing that.
2270          */
2271         if (request->packet->dst_port == 0) {
2272                 request->home_server = NULL;
2273                 return 1;
2274         }
2275
2276         if (request->home_server->server) {
2277                 return proxy_to_virtual_server(request);
2278         }
2279
2280         if (!proxy_request(request)) {
2281                 RDEBUG("ERROR: Failed to proxy request %d", request->number);
2282                 return -1;
2283         }
2284
2285         return 1;
2286 }
2287 #endif
2288
2289 static void request_post_handler(REQUEST *request)
2290 {
2291         int child_state = -1;
2292         struct timeval when;
2293         VALUE_PAIR *vp;
2294
2295         if ((request->master_state == REQUEST_STOP_PROCESSING) ||
2296             (request->parent &&
2297              (request->parent->master_state == REQUEST_STOP_PROCESSING))) {
2298                 RDEBUG2("Request %d was cancelled.", request->number);
2299 #ifdef HAVE_PTHREAD_H
2300                 request->child_pid = NO_SUCH_CHILD_PID;
2301 #endif
2302                 child_state = REQUEST_DONE;
2303                 goto cleanup;
2304         }
2305
2306         if (request->child_state != REQUEST_RUNNING) {
2307                 rad_panic("Internal sanity check failed");
2308         }
2309
2310 #ifdef WITH_COA
2311         /*
2312          *      If it's not in the request hash, it's a CoA request.
2313          *      We hope.
2314          */
2315         if (!request->in_request_hash &&
2316             request->proxy &&
2317             ((request->proxy->code == PW_COA_REQUEST) ||
2318              (request->proxy->code == PW_DISCONNECT_REQUEST))) {
2319                 request->next_callback = NULL;
2320                 child_state = REQUEST_DONE;
2321                 goto cleanup;
2322         }
2323 #endif
2324
2325         /*
2326          *      Catch Auth-Type := Reject BEFORE proxying the packet.
2327          */
2328         if ((request->packet->code == PW_AUTHENTICATION_REQUEST) &&
2329             (request->reply->code == 0) &&
2330             ((vp = pairfind(request->config_items, PW_AUTH_TYPE)) != NULL) &&
2331             (vp->vp_integer == PW_AUTHTYPE_REJECT)) {
2332                 request->reply->code = PW_AUTHENTICATION_REJECT;
2333         }
2334
2335 #ifdef WITH_PROXY
2336         if (request->root->proxy_requests &&
2337             !request->in_proxy_hash &&
2338             (request->reply->code == 0) &&
2339             (request->packet->dst_port != 0) &&
2340             (request->packet->code != PW_STATUS_SERVER)) {
2341                 int rcode = successfully_proxied_request(request);
2342
2343                 if (rcode == 1) return; /* request is invalid */
2344
2345                 /*
2346                  *      Failed proxying it (dead home servers, etc.)
2347                  *      Run it through Post-Proxy-Type = Fail, and
2348                  *      respond to the request.
2349                  *
2350                  *      Note that we're in a child thread here, so we
2351                  *      do NOT re-schedule the request.  Instead, we
2352                  *      do what we would have done, which is run the
2353                  *      pre-handler, a NULL request handler, and then
2354                  *      the post handler.
2355                  */
2356                 if ((rcode < 0) && setup_post_proxy_fail(request)) {
2357                         request_pre_handler(request);
2358                 }
2359
2360                 /*
2361                  *      Else we weren't supposed to proxy it,
2362                  *      OR we proxied it internally to a virutal server.
2363                  */
2364         }
2365 #endif
2366
2367         /*
2368          *      Fake requests don't get encoded or signed.  The caller
2369          *      also requires the reply VP's, so we don't free them
2370          *      here!
2371          */
2372         if (request->packet->dst_port == 0) {
2373                 /* FIXME: RDEBUG going to the next request */
2374 #ifdef HAVE_PTHREAD_H
2375                 request->child_pid = NO_SUCH_CHILD_PID;
2376 #endif
2377                 request->child_state = REQUEST_DONE;
2378                 return;
2379         }
2380
2381 #ifdef WITH_PROXY
2382         /*
2383          *      Copy Proxy-State from the request to the reply.
2384          */
2385         vp = paircopy2(request->packet->vps, PW_PROXY_STATE);
2386         if (vp) pairadd(&request->reply->vps, vp);
2387 #endif
2388
2389         /*
2390          *      Access-Requests get delayed or cached.
2391          */
2392         switch (request->packet->code) {
2393         case PW_AUTHENTICATION_REQUEST:
2394                 gettimeofday(&request->next_when, NULL);
2395
2396                 if (request->reply->code == 0) {
2397                         /*
2398                          *      Check if the lack of response is intentional.
2399                          */
2400                         vp = pairfind(request->config_items,
2401                                       PW_RESPONSE_PACKET_TYPE);
2402                         if (!vp) {
2403                                 RDEBUG2("There was no response configured: rejecting request %d",
2404                                        request->number);
2405                                 request->reply->code = PW_AUTHENTICATION_REJECT;
2406
2407                         } else if (vp->vp_integer == 256) {
2408                                 RDEBUG2("Not responding to request %d",
2409                                        request->number);
2410
2411                                 /*
2412                                  *      Force cleanup after a long
2413                                  *      time, so that we don't
2414                                  *      re-process the packet.
2415                                  */
2416                                 request->next_when.tv_sec += request->root->max_request_time;
2417                                 request->next_callback = cleanup_delay;
2418                                 child_state = REQUEST_CLEANUP_DELAY;
2419                                 break;
2420                         } else {
2421                                 request->reply->code = vp->vp_integer;
2422
2423                         }
2424                 }
2425
2426                 /*
2427                  *      Run rejected packets through
2428                  *
2429                  *      Post-Auth-Type = Reject
2430                  */
2431                 if (request->reply->code == PW_AUTHENTICATION_REJECT) {
2432                         pairdelete(&request->config_items, PW_POST_AUTH_TYPE);
2433                         vp = radius_pairmake(request, &request->config_items,
2434                                              "Post-Auth-Type", "Reject",
2435                                              T_OP_SET);
2436                         if (vp) rad_postauth(request);
2437
2438                         /*
2439                          *      If configured, delay Access-Reject packets.
2440                          *
2441                          *      If request->root->reject_delay = 0, we discover
2442                          *      that we have to send the packet now.
2443                          */
2444                         when = request->received;
2445                         when.tv_sec += request->root->reject_delay;
2446
2447                         if (timercmp(&when, &request->next_when, >)) {
2448                                 RDEBUG2("Delaying reject of request %d for %d seconds",
2449                                        request->number,
2450                                        request->root->reject_delay);
2451                                 request->next_when = when;
2452                                 request->next_callback = reject_delay;
2453 #ifdef HAVE_PTHREAD_H
2454                                 request->child_pid = NO_SUCH_CHILD_PID;
2455 #endif
2456                                 request->child_state = REQUEST_REJECT_DELAY;
2457                                 return;
2458                         }
2459                 }
2460
2461 #ifdef WITH_COA
2462         case PW_COA_REQUEST:
2463         case PW_DISCONNECT_REQUEST:
2464 #endif
2465                 request->next_when.tv_sec += request->root->cleanup_delay;
2466                 request->next_callback = cleanup_delay;
2467                 child_state = REQUEST_CLEANUP_DELAY;
2468                 break;
2469
2470         case PW_ACCOUNTING_REQUEST:
2471                 request->next_callback = NULL; /* just to be safe */
2472                 child_state = REQUEST_DONE;
2473                 break;
2474
2475                 /*
2476                  *      FIXME: Status-Server should probably not be
2477                  *      handled here...
2478                  */
2479         case PW_STATUS_SERVER:
2480                 request->next_callback = NULL;
2481                 child_state = REQUEST_DONE;
2482                 break;
2483
2484         default:
2485                 /*
2486                  *      DHCP, VMPS, etc.
2487                  */
2488                 request->next_callback = NULL;
2489                 child_state = REQUEST_DONE;
2490                 break;
2491         }
2492
2493         /*
2494          *      Suppress "no reply" packets here, unless we're reading
2495          *      from the "detail" file.  In that case, we've got to
2496          *      tell the detail file handler that the request is dead,
2497          *      and it should re-send it.
2498          *      If configured, encode, sign, and send.
2499          */
2500         if ((request->reply->code != 0) ||
2501             (request->listener->type == RAD_LISTEN_DETAIL)) {
2502                 DEBUG_PACKET(request, request->reply, 1);
2503                 request->listener->send(request->listener, request);
2504         }
2505
2506 #ifdef WITH_COA
2507         /*
2508          *      Now that we've completely processed the request,
2509          *      see if we need to originate a CoA request.
2510          */
2511         if (request->coa ||
2512             (pairfind(request->config_items, PW_SEND_COA_REQUEST) != NULL)) {
2513                 if (!originated_coa_request(request)) {
2514                         RDEBUG2("Do CoA Fail handler here");
2515                 }
2516                 /* request->coa is stil set, so we can update events */
2517         }
2518 #endif
2519
2520  cleanup:
2521         /*
2522          *      Clean up.  These are no longer needed.
2523          */
2524         pairfree(&request->config_items);
2525
2526         pairfree(&request->packet->vps);
2527         request->username = NULL;
2528         request->password = NULL;
2529
2530         pairfree(&request->reply->vps);
2531
2532 #ifdef WITH_PROXY
2533         if (request->proxy) {
2534                 pairfree(&request->proxy->vps);
2535
2536                 if (request->proxy_reply) {
2537                         pairfree(&request->proxy_reply->vps);
2538                 }
2539
2540 #if 0
2541                 /*
2542                  *      We're not tracking responses from the home
2543                  *      server, we can therefore free this memory in
2544                  *      the child thread.
2545                  */
2546                 if (!request->in_proxy_hash) {
2547                         rad_free(&request->proxy);
2548                         rad_free(&request->proxy_reply);
2549                         request->home_server = NULL;
2550                 }
2551 #endif
2552         }
2553 #endif
2554
2555         RDEBUG2("Finished request %d.", request->number);
2556         rad_assert(child_state >= 0);
2557         request->child_state = child_state;
2558
2559         /*
2560          *      Single threaded mode: update timers now.
2561          */
2562         if (!have_children) wait_a_bit(request);
2563 }
2564
2565
2566 static void received_retransmit(REQUEST *request, const RADCLIENT *client)
2567 {
2568 #ifdef WITH_PROXY
2569         char buffer[128];
2570 #endif
2571
2572         RAD_STATS_TYPE_INC(request->listener, total_dup_requests);
2573         RAD_STATS_CLIENT_INC(request->listener, client, total_dup_requests);
2574
2575         switch (request->child_state) {
2576         case REQUEST_QUEUED:
2577         case REQUEST_RUNNING:
2578 #ifdef WITH_PROXY
2579         discard:
2580 #endif
2581                 radlog(L_ERR, "Discarding duplicate request from "
2582                        "client %s port %d - ID: %d due to unfinished request %d",
2583                        client->shortname,
2584                        request->packet->src_port,request->packet->id,
2585                        request->number);
2586                 break;
2587
2588 #ifdef WITH_PROXY
2589         case REQUEST_PROXIED:
2590                 /*
2591                  *      We're not supposed to have duplicate
2592                  *      accounting packets.  The other states handle
2593                  *      duplicates fine (discard, or send duplicate
2594                  *      reply).  But we do NOT want to retransmit an
2595                  *      accounting request here, because that would
2596                  *      involve updating the Acct-Delay-Time, and
2597                  *      therefore changing the packet Id, etc.
2598                  *
2599                  *      Instead, we just discard the packet.  We may
2600                  *      eventually respond, or the client will send a
2601                  *      new accounting packet.
2602                  *
2603                  *      The same comments go for Status-Server, and
2604                  *      other packet types.
2605                  *
2606                  *      FIXME: coa: when we proxy CoA && Disconnect
2607                  *      packets, this logic has to be fixed.
2608                  */
2609                 if (request->packet->code != PW_AUTHENTICATION_REQUEST) {
2610                         goto discard;
2611                 }
2612
2613                 check_for_zombie_home_server(request);
2614
2615                 /*
2616                  *      If we've just discovered that the home server
2617                  *      is dead, OR the socket has been closed, look for
2618                  *      another connection to a home server.
2619                  */
2620                 if (((request->packet->dst_port != 0) &&
2621                      (request->home_server->state == HOME_STATE_IS_DEAD)) ||
2622                     (request->proxy_listener->status != RAD_LISTEN_STATUS_KNOWN)) {
2623                         home_server *home;
2624
2625                         remove_from_proxy_hash(request);
2626
2627                         home = home_server_ldb(NULL, request->home_pool, request);
2628                         if (!home) {
2629                                 RDEBUG2("Failed to find live home server for request %d", request->number);
2630                         no_home_servers:
2631                                 /*
2632                                  *      Do post-request processing,
2633                                  *      and any insertion of necessary
2634                                  *      events.
2635                                  */
2636                                 post_proxy_fail_handler(request);
2637                                 return;
2638                         }
2639
2640                         request->proxy->code = request->packet->code;
2641
2642                         /*
2643                          *      Free the old packet, to force re-encoding
2644                          */
2645                         free(request->proxy->data);
2646                         request->proxy->data = NULL;
2647                         request->proxy->data_len = 0;
2648
2649                         /*
2650                          *      This request failed over to a virtual
2651                          *      server.  Push it back onto the queue
2652                          *      to be processed.
2653                          */
2654                         if (request->home_server->server) {
2655                                 proxy_fallback_handler(request);
2656                                 return;
2657                         }
2658
2659                         /*
2660                          *      Try to proxy the request.
2661                          */
2662                         if (!proxy_request(request)) {
2663                                 RDEBUG("ERROR: Failed to re-proxy request %d", request->number);
2664                                 goto no_home_servers;
2665                         }
2666
2667                         /*
2668                          *      This code executes in the main server
2669                          *      thread, so there's no need for locking.
2670                          */
2671                         rad_assert(request->next_callback != NULL);
2672                         INSERT_EVENT(request->next_callback, request);
2673                         request->next_callback = NULL;
2674                         return;
2675                 } /* else the home server is still alive */
2676
2677                 RDEBUG2("Sending duplicate proxied request to home server %s port %d - ID: %d",
2678                        inet_ntop(request->proxy->dst_ipaddr.af,
2679                                  &request->proxy->dst_ipaddr.ipaddr,
2680                                  buffer, sizeof(buffer)),
2681                        request->proxy->dst_port,
2682                        request->proxy->id);
2683                 request->num_proxied_requests++;
2684
2685                 DEBUG_PACKET(request, request->proxy, 1);
2686                 request->proxy_listener->send(request->proxy_listener,
2687                                               request);
2688                 break;
2689 #endif
2690
2691         case REQUEST_REJECT_DELAY:
2692                 RDEBUG2("Waiting to send Access-Reject "
2693                        "to client %s port %d - ID: %d",
2694                        client->shortname,
2695                        request->packet->src_port, request->packet->id);
2696                 break;
2697
2698         case REQUEST_CLEANUP_DELAY:
2699         case REQUEST_DONE:
2700                 if (request->reply->code == 0) {
2701                         RDEBUG2("Ignoring retransmit from client %s port %d "
2702                                 "- ID: %d, no reply was configured",
2703                                 client->shortname,
2704                                 request->packet->src_port, request->packet->id);
2705                         return;
2706                 }
2707
2708                 /*
2709                  *      FIXME: This sends duplicate replies to
2710                  *      accounting requests, even if Acct-Delay-Time
2711                  *      or Event-Timestamp is in the packet.  In those
2712                  *      cases, the Id should be changed, and the packet
2713                  *      re-calculated.
2714                  */
2715                 RDEBUG2("Sending duplicate reply "
2716                        "to client %s port %d - ID: %d",
2717                        client->shortname,
2718                        request->packet->src_port, request->packet->id);
2719                 DEBUG_PACKET(request, request->reply, 1);
2720                 request->listener->send(request->listener, request);
2721                 break;
2722         }
2723 }
2724
2725
2726 static void received_conflicting_request(REQUEST *request,
2727                                          const RADCLIENT *client)
2728 {
2729         radlog(L_ERR, "Received conflicting packet from "
2730                "client %s port %d - ID: %d due to unfinished request %d.  Giving up on old request.",
2731                client->shortname,
2732                request->packet->src_port, request->packet->id,
2733                request->number);
2734
2735         /*
2736          *      Nuke it from the request hash, so we can receive new
2737          *      packets.
2738          */
2739         remove_from_request_hash(request);
2740
2741         switch (request->child_state) {
2742 #ifdef HAVE_PTHREAD_H
2743                 /*
2744                  *      It's queued or running.  Tell it to stop, and
2745                  *      wait for it to do so.
2746                  */
2747         case REQUEST_QUEUED:
2748         case REQUEST_RUNNING:
2749                 request->master_state = REQUEST_STOP_PROCESSING;
2750                 request->delay += request->delay >> 1;
2751
2752                 tv_add(&request->when, request->delay);
2753
2754                 INSERT_EVENT(wait_for_child_to_die, request);
2755                 return;
2756 #endif
2757
2758                 /*
2759                  *      Catch race conditions.  It may have switched
2760                  *      from running to done while this code is being
2761                  *      executed.
2762                  */
2763         case REQUEST_REJECT_DELAY:
2764         case REQUEST_CLEANUP_DELAY:
2765         case REQUEST_DONE:
2766                 break;
2767
2768                 /*
2769                  *      It's in some other state, and therefore also
2770                  *      in the event queue.  At some point, the
2771                  *      child will notice, and we can then delete it.
2772                  */
2773         case REQUEST_PROXIED:
2774         default:
2775                 rad_assert(request->ev != NULL);
2776                 break;
2777         }
2778 }
2779
2780
2781 static int can_handle_new_request(RADIUS_PACKET *packet,
2782                                   RADCLIENT *client,
2783                                   struct main_config_t *root)
2784 {
2785         /*
2786          *      Count the total number of requests, to see if
2787          *      there are too many.  If so, return with an
2788          *      error.
2789          */
2790         if (root->max_requests) {
2791                 int request_count = fr_packet_list_num_elements(pl);
2792
2793                 /*
2794                  *      This is a new request.  Let's see if
2795                  *      it makes us go over our configured
2796                  *      bounds.
2797                  */
2798                 if (request_count > root->max_requests) {
2799                         radlog(L_ERR, "Dropping request (%d is too many): "
2800                                "from client %s port %d - ID: %d", request_count,
2801                                client->shortname,
2802                                packet->src_port, packet->id);
2803                         radlog(L_INFO, "WARNING: Please check the configuration file.\n"
2804                                "\tThe value for 'max_requests' is probably set too low.\n");
2805                         return 0;
2806                 } /* else there were a small number of requests */
2807         } /* else there was no configured limit for requests */
2808
2809         /*
2810          *      FIXME: Add per-client checks.  If one client is sending
2811          *      too many packets, start discarding them.
2812          *
2813          *      We increment the counters here, and decrement them
2814          *      when the response is sent... somewhere in this file.
2815          */
2816
2817         /*
2818          *      FUTURE: Add checks for system load.  If the system is
2819          *      busy, start dropping requests...
2820          *
2821          *      We can probably keep some statistics ourselves...  if
2822          *      there are more requests coming in than we can handle,
2823          *      start dropping some.
2824          */
2825
2826         return 1;
2827 }
2828
2829
2830 int received_request(rad_listen_t *listener,
2831                      RADIUS_PACKET *packet, REQUEST **prequest,
2832                      RADCLIENT *client)
2833 {
2834         RADIUS_PACKET **packet_p;
2835         REQUEST *request = NULL;
2836         struct main_config_t *root = &mainconfig;
2837
2838         packet_p = fr_packet_list_find(pl, packet);
2839         if (packet_p) {
2840                 request = fr_packet2myptr(REQUEST, packet, packet_p);
2841                 rad_assert(request->in_request_hash);
2842
2843                 if ((request->packet->data_len == packet->data_len) &&
2844                     (memcmp(request->packet->vector, packet->vector,
2845                             sizeof(packet->vector)) == 0)) {
2846                         received_retransmit(request, client);
2847                         return 0;
2848                 }
2849
2850                 /*
2851                  *      The new request is different from the old one,
2852                  *      but maybe the old is finished.  If so, delete
2853                  *      the old one.
2854                  */
2855                 switch (request->child_state) {
2856                         struct timeval when;
2857
2858                 default:
2859                         /*
2860                          *      Special hacks for race conditions.
2861                          *      The reply is encoded, and therefore
2862                          *      likely sent.  We received a *new*
2863                          *      packet from the client, likely before
2864                          *      the next line or two of code which
2865                          *      updated the child state.  In this
2866                          *      case, just accept the new request.
2867                          */
2868                         if ((request->reply->code != 0) &&
2869                             request->reply->data) {
2870                                 radlog(L_INFO, "WARNING: Allowing fast client %s port %d - ID: %d for recent request %d.",
2871                                        client->shortname,
2872                                        packet->src_port, packet->id,
2873                                        request->number);
2874                                 remove_from_request_hash(request);
2875                                 request = NULL;
2876                                 break;
2877                         }
2878
2879                         gettimeofday(&when, NULL);
2880                         when.tv_sec -= 1;
2881
2882                         /*
2883                          *      If the cached request was received
2884                          *      within the last second, then we
2885                          *      discard the NEW request instead of the
2886                          *      old one.  This will happen ONLY when
2887                          *      the client is severely broken, and is
2888                          *      sending conflicting packets very
2889                          *      quickly.
2890                          */
2891                         if (timercmp(&when, &request->received, <)) {
2892                                 radlog(L_ERR, "Discarding conflicting packet from "
2893                                        "client %s port %d - ID: %d due to recent request %d.",
2894                                        client->shortname,
2895                                        packet->src_port, packet->id,
2896                                        request->number);
2897                                 return 0;
2898                         }
2899
2900                         received_conflicting_request(request, client);
2901                         request = NULL;
2902                         break;
2903
2904                 case REQUEST_REJECT_DELAY:
2905                 case REQUEST_CLEANUP_DELAY:
2906                         request->child_state = REQUEST_DONE;
2907                 case REQUEST_DONE:
2908                         cleanup_delay(request);
2909                         request = NULL;
2910                         break;
2911                 }
2912         }
2913
2914         /*
2915          *      We may want to quench the new request.
2916          */
2917         if ((listener->type != RAD_LISTEN_DETAIL) &&
2918             !can_handle_new_request(packet, client, root)) {
2919                 return 0;
2920         }
2921
2922         /*
2923          *      Create and initialize the new request.
2924          */
2925         request = request_alloc(); /* never fails */
2926
2927         if ((request->reply = rad_alloc(0)) == NULL) {
2928                 radlog(L_ERR, "No memory");
2929                 exit(1);
2930         }
2931
2932         request->listener = listener;
2933         request->client = client;
2934         request->packet = packet;
2935         request->packet->timestamp = request->timestamp;
2936         request->number = request_num_counter++;
2937         request->priority = listener->type;
2938 #ifdef HAVE_PTHREAD_H
2939         request->child_pid = NO_SUCH_CHILD_PID;
2940 #endif
2941
2942         /*
2943          *      Status-Server packets go to the head of the queue.
2944          */
2945         if (request->packet->code == PW_STATUS_SERVER) request->priority = 0;
2946
2947         /*
2948          *      Set virtual server identity
2949          */
2950         if (client->server) {
2951                 request->server = client->server;
2952         } else if (listener->server) {
2953                 request->server = listener->server;
2954         } else {
2955                 request->server = NULL;
2956         }
2957
2958         /*
2959          *      Remember the request in the list.
2960          */
2961         if (!fr_packet_list_insert(pl, &request->packet)) {
2962                 radlog(L_ERR, "Failed to insert request %d in the list of live requests: discarding", request->number);
2963                 ev_request_free(&request);
2964                 return 0;
2965         }
2966
2967         request->in_request_hash = TRUE;
2968         request->root = root;
2969         root->refcount++;
2970 #ifdef WITH_TCP
2971         request->listener->count++;
2972 #endif
2973
2974         /*
2975          *      The request passes many of our sanity checks.
2976          *      From here on in, if anything goes wrong, we
2977          *      send a reject message, instead of dropping the
2978          *      packet.
2979          */
2980
2981         /*
2982          *      Build the reply template from the request.
2983          */
2984
2985         request->reply->sockfd = request->packet->sockfd;
2986         request->reply->dst_ipaddr = request->packet->src_ipaddr;
2987         request->reply->src_ipaddr = request->packet->dst_ipaddr;
2988         request->reply->dst_port = request->packet->src_port;
2989         request->reply->src_port = request->packet->dst_port;
2990         request->reply->id = request->packet->id;
2991         request->reply->code = 0; /* UNKNOWN code */
2992         memcpy(request->reply->vector, request->packet->vector,
2993                sizeof(request->reply->vector));
2994         request->reply->vps = NULL;
2995         request->reply->data = NULL;
2996         request->reply->data_len = 0;
2997
2998         request->master_state = REQUEST_ACTIVE;
2999         request->child_state = REQUEST_QUEUED;
3000         request->next_callback = NULL;
3001
3002         gettimeofday(&request->received, NULL);
3003         request->timestamp = request->received.tv_sec;
3004         request->when = request->received;
3005
3006         request->delay = USEC;
3007
3008         tv_add(&request->when, request->delay);
3009
3010         INSERT_EVENT(wait_a_bit, request);
3011
3012         *prequest = request;
3013         return 1;
3014 }
3015
3016
3017 #ifdef WITH_PROXY
3018 #ifdef WITH_TCP
3019 /*
3020  *      received_proxy_response is split in two for TCP handling.
3021  */
3022 static REQUEST *received_proxy_response_p2(RADIUS_PACKET *packet,
3023                                             REQUEST *request);
3024 #endif
3025
3026 REQUEST *received_proxy_response(RADIUS_PACKET *packet)
3027 {
3028 #ifndef WITH_TCP
3029         char            buffer[128];
3030         home_server     *home;
3031 #endif
3032         REQUEST         *request;
3033
3034         /*
3035          *      Also removes from the proxy hash if responses == requests
3036          */
3037         request = lookup_in_proxy_hash(packet);
3038
3039 #ifdef WITH_TCP
3040         return received_proxy_response_p2(packet, request);
3041 }
3042
3043 static REQUEST *received_proxy_response_p2(RADIUS_PACKET *packet,
3044                                            REQUEST *request)
3045 {
3046         char            buffer[128];
3047         fr_tcp_radius_t *tcp;
3048 #endif
3049
3050         if (!request) {
3051                 radlog(L_PROXY, "No outstanding request was found for reply from host %s port %d - ID %d",
3052                        inet_ntop(packet->src_ipaddr.af,
3053                                  &packet->src_ipaddr.ipaddr,
3054                                  buffer, sizeof(buffer)),
3055                        packet->src_port, packet->id);
3056                 return NULL;
3057         }
3058
3059         /*
3060          *      We haven't replied to the NAS, but we have seen an
3061          *      earlier reply from the home server.  Ignore this packet,
3062          *      as we're likely still processing the previous reply.
3063          */
3064         if (request->proxy_reply) {
3065                 if (memcmp(request->proxy_reply->vector,
3066                            packet->vector,
3067                            sizeof(request->proxy_reply->vector)) == 0) {
3068                         RDEBUG2("Discarding duplicate reply from host %s port %d  - ID: %d for request %d",
3069                                inet_ntop(packet->src_ipaddr.af,
3070                                          &packet->src_ipaddr.ipaddr,
3071                                          buffer, sizeof(buffer)),
3072                                packet->src_port, packet->id,
3073                                request->number);
3074                 } else {
3075                         /*
3076                          *      ? The home server gave us a new proxy
3077                          *      reply which doesn't match the old
3078                          *      one.  Delete it.
3079                          */
3080                         RDEBUG2("Ignoring conflicting proxy reply");
3081                 }
3082
3083                 /* assert that there's an event queued for request? */
3084                 return NULL;
3085         }
3086
3087         /*
3088          *      Verify the packet before doing ANYTHING with it.  This
3089          *      means we're doing more MD5 checks in the server core.
3090          *      However, we can fix that by moving to multiple threads
3091          *      listening on sockets.
3092          *
3093          *      We do this AFTER looking the request up in the hash,
3094          *      and AFTER vhecking if we saw a previous request.  This
3095          *      helps minimize the DoS effect of people attacking us
3096          *      with spoofed packets.
3097          */
3098         if (rad_verify(packet, request->proxy,
3099                        request->home_server->secret) != 0) {
3100                 DEBUG("Ignoring spoofed proxy reply.  Signature is invalid");
3101                 return NULL;
3102         }
3103
3104         gettimeofday(&now, NULL);
3105
3106         /*
3107          *      Maybe move this earlier in the decision process?
3108          *      Having it here means that late or duplicate proxy
3109          *      replies no longer get the home server marked as
3110          *      "alive".  This might be good for stability, though.
3111          *
3112          *      FIXME: Do we really want to do this whenever we
3113          *      receive a packet?  Setting this here means that we
3114          *      mark it alive on *any* packet, even if it's lost all
3115          *      of the *other* packets in the last 10s.
3116          */
3117         request->home_server->state = HOME_STATE_ALIVE;
3118
3119 #ifdef WITH_COA
3120         /*
3121          *      When originating CoA, the "proxy" reply is the reply
3122          *      to the CoA request that we originated.  At this point,
3123          *      the original request is finished, and it has a reply.
3124          *
3125          *      However, if we haven't separated the two requests, do
3126          *      so now.  This is done so that cleaning up the original
3127          *      request won't cause the CoA request to be free'd.  See
3128          *      util.c, request_free()
3129          */
3130         if (request->parent && (request->parent->coa == request)) {
3131                 request->parent->coa = NULL;
3132                 request->parent = NULL;
3133
3134         } else
3135                 /*
3136                  *      Skip the next set of checks, as the original
3137                  *      reply is cached.  We want to be able to still
3138                  *      process the CoA reply, AND to reference the
3139                  *      original request/reply.
3140                  *
3141                  *      This is getting to be really quite a bit of a
3142                  *      hack.
3143                  */
3144 #endif
3145
3146         /*
3147          *      If there's a reply to the NAS, ignore everything
3148          *      related to proxy responses
3149          */
3150         if (request->reply && request->reply->code != 0) {
3151                 RDEBUG2("Ignoring proxy reply that arrived after we sent a reply to the NAS");
3152                 return NULL;
3153         }
3154
3155 #ifdef WITH_STATS
3156         /*
3157          *      The average includes our time to receive packets and
3158          *      look them up in the hashes, which should be the same
3159          *      for all packets.
3160          *
3161          *      We update the response time only for the FIRST packet
3162          *      we receive.
3163          */
3164         if (request->home_server->ema.window > 0) {
3165                 radius_stats_ema(&request->home_server->ema,
3166                                  &now, &request->proxy_when);
3167         }
3168 #endif
3169
3170         switch (request->child_state) {
3171         case REQUEST_QUEUED:
3172         case REQUEST_RUNNING:
3173                 radlog(L_ERR, "Internal sanity check failed for child state");
3174                 /* FALL-THROUGH */
3175
3176         case REQUEST_REJECT_DELAY:
3177         case REQUEST_CLEANUP_DELAY:
3178         case REQUEST_DONE:
3179                 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'",
3180                        inet_ntop(packet->src_ipaddr.af,
3181                                  &packet->src_ipaddr.ipaddr,
3182                                  buffer, sizeof(buffer)),
3183                        packet->src_port, packet->id,
3184                        request->number);
3185                 /* assert that there's an event queued for request? */
3186                 return NULL;
3187
3188         case REQUEST_PROXIED:
3189                 break;
3190         }
3191
3192         request->proxy_reply = packet;
3193
3194 #if 0
3195         /*
3196          *      Perform RTT calculations, as per RFC 2988 (for TCP).
3197          *      Note that we only do so on the first response.
3198          */
3199         if ((request->num_proxied_responses == 1)
3200                 int rtt;
3201                 home_server *home = request->home_server;
3202
3203                 rtt = now.tv_sec - request->proxy_when.tv_sec;
3204                 rtt *= USEC;
3205                 rtt += now.tv_usec;
3206                 rtt -= request->proxy_when.tv_usec;
3207
3208                 if (!home->has_rtt) {
3209                         home->has_rtt = TRUE;
3210
3211                         home->srtt = rtt;
3212                         home->rttvar = rtt / 2;
3213
3214                 } else {
3215                         home->rttvar -= home->rttvar >> 2;
3216                         home->rttvar += (home->srtt - rtt);
3217                         home->srtt -= home->srtt >> 3;
3218                         home->srtt += rtt >> 3;
3219                 }
3220
3221                 home->rto = home->srtt;
3222                 if (home->rttvar > (USEC / 4)) {
3223                         home->rto += home->rttvar * 4;
3224                 } else {
3225                         home->rto += USEC;
3226                 }
3227         }
3228 #endif
3229
3230         /*
3231          *      There's no incoming request, so it's a proxied packet
3232          *      we originated.
3233          */
3234         if (!request->packet) {
3235                 received_response_to_ping(request);
3236                 request->proxy_reply = NULL; /* caller will free it */
3237                 ev_request_free(&request);
3238                 return NULL;
3239         }
3240
3241         request->child_state = REQUEST_QUEUED;
3242         request->when = now;
3243         request->delay = USEC;
3244         request->priority = RAD_LISTEN_PROXY;
3245         tv_add(&request->when, request->delay);
3246
3247 #ifdef WITH_TCP
3248         tcp = fr_listen2tcp(request->proxy_listener);
3249         if (tcp) {
3250                 if ((tcp->lifetime > 0) &&
3251                     (now.tv_sec > (tcp->opened + tcp->lifetime))) {
3252                         proxy_close_tcp_listener(request->proxy_listener);
3253                 } else
3254
3255                 /*
3256                  *      No outstanding packets.  Set up idle timeout
3257                  *      timer, but only if we didn't already do so
3258                  *      this second.
3259                  */
3260                 if ((tcp->used == 0) &&
3261                     (request->home_server->idle_timeout != 0) &&
3262                     (tcp->last_packet != now.tv_sec)) {
3263                         struct timeval when;
3264
3265                         when = now;
3266                         when.tv_sec += request->home_server->idle_timeout;
3267
3268                         fr_event_insert(el, tcp_idle_timeout,
3269                                         request->proxy_listener,
3270                                         &when, (fr_event_t **) &tcp->ev);
3271                 }
3272
3273                 tcp->last_packet = request->proxy_reply->timestamp = now.tv_sec;
3274         }
3275 #endif
3276
3277         /*
3278          *      Wait a bit will take care of max_request_time
3279          */
3280         INSERT_EVENT(wait_a_bit, request);
3281
3282         return request;
3283 }
3284
3285 #ifdef WITH_TCP
3286 REQUEST *received_proxy_tcp_response(RADIUS_PACKET *packet,
3287                                      fr_tcp_radius_t *tcp)
3288 {
3289         REQUEST         *request;
3290
3291         /*
3292          *      Not found.  Print the same message as all the other
3293          *      code paths.
3294          */
3295         if (!tcp || !tcp->ids[packet->id]) {
3296                 return received_proxy_response_p2(packet, NULL);
3297         }
3298
3299         /*
3300          *      Find request from: tcp->ids[packet->id] = &request->proxy
3301          */
3302         request = fr_packet2myptr(REQUEST, proxy, tcp->ids[packet->id]);
3303
3304         /*
3305          *      TCP sockets don't do re-transmits.  Just nuke it.
3306          */
3307         remove_from_proxy_hash(request);
3308
3309         /*
3310          *      FIXME: Update RFC 3539 watchdog timer.
3311          */
3312
3313         return received_proxy_response_p2(packet, request);
3314 }
3315 #endif /* WITH_TCP */
3316 #endif /* WITH_PROXY */
3317
3318 void event_new_fd(rad_listen_t *this)
3319 {
3320         char buffer[1024];
3321
3322         if (this->status == RAD_LISTEN_STATUS_KNOWN) return;
3323
3324         this->print(this, buffer, sizeof(buffer));
3325
3326         if (this->status == RAD_LISTEN_STATUS_INIT) {
3327                 if (just_started) {
3328                         DEBUG("Listening on %s", buffer);
3329                 } else {
3330                         DEBUG2(" ... adding new socket %s", buffer);
3331                 }
3332                 if (!fr_event_fd_insert(el, 0, this->fd,
3333                                         event_socket_handler, this)) {
3334                         radlog(L_ERR, "Failed remembering handle for proxy socket!");
3335                         exit(1);
3336                 }
3337
3338 #ifdef WITH_TCP
3339                 if (this->type == RAD_LISTEN_PROXY) {
3340                         fr_tcp_radius_t *tcp = fr_listen2tcp(this);
3341
3342                         if (tcp && (tcp->lifetime > 0)) {
3343                                 struct timeval when;
3344
3345                                 gettimeofday(&when, NULL);
3346                                 when.tv_sec += tcp->lifetime;
3347
3348                                 fr_event_insert(el, tcp_socket_lifetime,
3349                                                 this,
3350                                                 &when, (fr_event_t **) &tcp->ev);
3351                         }
3352                 }
3353 #endif
3354
3355                 this->status = RAD_LISTEN_STATUS_KNOWN;
3356                 return;
3357         }
3358
3359         if (this->status == RAD_LISTEN_STATUS_CLOSED) {
3360                 DEBUG2(" ... closing socket %s", buffer);
3361
3362                 fr_event_fd_delete(el, 0, this->fd);
3363                 this->status = RAD_LISTEN_STATUS_FINISH;
3364
3365 #ifdef WITH_TCP
3366                 /*
3367                  *      FIXME: mark ALL requests for this connection
3368                  *      as MASTER FORCE STOP!  we can't reply, so
3369                  *      there's no point in doing anything
3370                  *
3371                  *      ALSO, create packet lists JUST for each proxy
3372                  */
3373
3374                 /*
3375                  *      Once we're done, the caller free's the
3376                  *      listener.  However, we've got to ensure that
3377                  *      all of the requests using this listener are
3378                  *      marked as dead.
3379                  */
3380                 if (this->type == RAD_LISTEN_PROXY) {
3381                         int i;
3382                         REQUEST *request;
3383                         fr_tcp_radius_t *tcp = fr_listen2tcp(this);
3384
3385                         if (!tcp) return;
3386
3387                         for (i = 0; i < 256; i++) {
3388                                 if (!tcp->ids[i]) continue;
3389
3390                                 request = fr_packet2myptr(REQUEST, proxy,
3391                                                           tcp->ids[i]);
3392                                 request->proxy->sockfd = -1;
3393                                 request->proxy_listener = NULL;
3394                                 request->in_proxy_hash = FALSE;
3395                                 tcp->ids[i] = NULL;
3396                                 tcp->used--;
3397                         }
3398                         tcp->used = 0; /* just to be safe */
3399
3400                         fr_event_delete(el, (fr_event_t **) &tcp->ev);
3401                 }
3402 #endif
3403
3404                 /*
3405                  *      Close the fd AFTER fixing up the requests and
3406                  *      listeners, so that they don't send/recv on the
3407                  *      wrong socket (if someone manages to open
3408                  *      another one).
3409                  */
3410                 close(this->fd);
3411                 this->fd = -1;
3412         }
3413 }
3414
3415 static void handle_signal_self(int flag)
3416 {
3417         if ((flag & (RADIUS_SIGNAL_SELF_EXIT | RADIUS_SIGNAL_SELF_TERM)) != 0) {
3418                 if ((flag & RADIUS_SIGNAL_SELF_EXIT) != 0) {
3419                         fr_event_loop_exit(el, 1);
3420                 } else {
3421                         fr_event_loop_exit(el, 2);
3422                 }
3423
3424                 return;
3425         } /* else exit/term flags weren't set */
3426
3427         /*
3428          *      Tell the even loop to stop processing.
3429          */
3430         if ((flag & RADIUS_SIGNAL_SELF_HUP) != 0) {
3431                 time_t when;
3432                 static time_t last_hup = 0;
3433
3434                 DEBUG("Received HUP signal.");
3435
3436                 when = time(NULL);
3437                 if ((int) (when - last_hup) < 5) {
3438                         radlog(L_INFO, "Ignoring HUP (less than 5s since last one)");
3439                         return;
3440                 }
3441                 last_hup = when;
3442
3443                 fr_event_loop_exit(el, 0x80);
3444         }
3445
3446 #ifdef WITH_DETAIL
3447         if ((flag & RADIUS_SIGNAL_SELF_DETAIL) != 0) {
3448                 rad_listen_t *this;
3449
3450                 /*
3451                  *      FIXME: O(N) loops suck.
3452                  */
3453                 for (this = mainconfig.listen;
3454                      this != NULL;
3455                      this = this->next) {
3456                         if (this->type != RAD_LISTEN_DETAIL) continue;
3457
3458                         /*
3459                          *      This one didn't send the signal, skip
3460                          *      it.
3461                          */
3462                         if (!this->decode(this, NULL)) continue;
3463
3464                         /*
3465                          *      Go service the interrupt.
3466                          */
3467                         event_poll_detail(this);
3468                 }
3469         }
3470 #endif
3471
3472         if ((flag & RADIUS_SIGNAL_SELF_NEW_FD) != 0) {
3473                 rad_listen_t *this;
3474
3475                 for (this = mainconfig.listen;
3476                      this != NULL;
3477                      this = this->next) {
3478                         event_new_fd(this);
3479                 }
3480         }
3481 }
3482
3483 #ifndef WITH_SELF_PIPE
3484 void radius_signal_self(int flag)
3485 {
3486         handle_signal_self(flag);
3487 }
3488 #else
3489 /*
3490  *      Inform ourselves that we received a signal.
3491  */
3492 void radius_signal_self(int flag)
3493 {
3494         ssize_t rcode;
3495         uint8_t buffer[16];
3496
3497         /*
3498          *      The read MUST be non-blocking for this to work.
3499          */
3500         rcode = read(self_pipe[0], buffer, sizeof(buffer));
3501         if (rcode > 0) {
3502                 ssize_t i;
3503
3504                 for (i = 0; i < rcode; i++) {
3505                         buffer[0] |= buffer[i];
3506                 }
3507         } else {
3508                 buffer[0] = 0;
3509         }
3510
3511         buffer[0] |= flag;
3512
3513         write(self_pipe[1], buffer, 1);
3514 }
3515
3516
3517 static void event_signal_handler(UNUSED fr_event_list_t *xel,
3518                                  UNUSED int fd, UNUSED void *ctx)
3519 {
3520         ssize_t i, rcode;
3521         uint8_t buffer[32];
3522
3523         rcode = read(self_pipe[0], buffer, sizeof(buffer));
3524         if (rcode <= 0) return;
3525
3526         /*
3527          *      Merge pending signals.
3528          */
3529         for (i = 0; i < rcode; i++) {
3530                 buffer[0] |= buffer[i];
3531         }
3532
3533         handle_signal_self(buffer[0]);
3534 }
3535 #endif
3536
3537
3538 static void event_socket_handler(fr_event_list_t *xel, UNUSED int fd,
3539                                  void *ctx)
3540 {
3541         rad_listen_t *listener = ctx;
3542         RAD_REQUEST_FUNP fun;
3543         REQUEST *request;
3544
3545         rad_assert(xel == el);
3546
3547         xel = xel;
3548
3549         if (listener->fd < 0) rad_panic("Socket was closed on us!");
3550
3551         if (!listener->recv(listener, &fun, &request)) return;
3552
3553         if (!thread_pool_addrequest(request, fun)) {
3554                 request->child_state = REQUEST_DONE;
3555         }
3556 }
3557
3558 typedef struct listen_detail_t {
3559         fr_event_t      *ev;
3560 } listen_detail_t;
3561
3562 /*
3563  *      This function is called periodically to see if this detail
3564  *      file is available for reading.
3565  */
3566 static void event_poll_detail(void *ctx)
3567 {
3568         int rcode, delay;
3569         RAD_REQUEST_FUNP fun;
3570         REQUEST *request;
3571         rad_listen_t *this = ctx;
3572         struct timeval when;
3573         listen_detail_t *detail = this->data;
3574
3575         rad_assert(this->type == RAD_LISTEN_DETAIL);
3576
3577         /*
3578          *      Try to read something.
3579          *
3580          *      FIXME: This does poll AND receive.
3581          */
3582         rcode = this->recv(this, &fun, &request);
3583         if (rcode != 0) {
3584                 rad_assert(fun != NULL);
3585                 rad_assert(request != NULL);
3586
3587                 if (!thread_pool_addrequest(request, fun)) {
3588                         request->child_state = REQUEST_DONE;
3589                 }
3590         }
3591
3592         if (!fr_event_now(el, &now)) gettimeofday(&now, NULL);
3593         when = now;
3594
3595         /*
3596          *      Backdoor API to get the delay until the next poll
3597          *      time.
3598          */
3599         delay = this->encode(this, NULL);
3600         tv_add(&when, delay);
3601
3602         if (!fr_event_insert(el, event_poll_detail, this,
3603                              &when, &detail->ev)) {
3604                 radlog(L_ERR, "Failed creating handler");
3605                 exit(1);
3606         }
3607 }
3608
3609
3610 static void event_status(struct timeval *wake)
3611 {
3612 #if !defined(HAVE_PTHREAD_H) && defined(WNOHANG)
3613         int argval;
3614 #endif
3615
3616         if (debug_flag == 0) {
3617                 if (just_started) {
3618                         radlog(L_INFO, "Ready to process requests.");
3619                         just_started = FALSE;
3620                 }
3621                 return;
3622         }
3623
3624         if (!wake) {
3625                 DEBUG("Ready to process requests.");
3626
3627         } else if ((wake->tv_sec != 0) ||
3628                    (wake->tv_usec >= 100000)) {
3629                 DEBUG("Waking up in %d.%01u seconds.",
3630                       (int) wake->tv_sec, (unsigned int) wake->tv_usec / 100000);
3631         }
3632
3633
3634         /*
3635          *      FIXME: Put this somewhere else, where it isn't called
3636          *      all of the time...
3637          */
3638
3639 #if !defined(HAVE_PTHREAD_H) && defined(WNOHANG)
3640         /*
3641          *      If there are no child threads, then there may
3642          *      be child processes.  In that case, wait for
3643          *      their exit status, and throw that exit status
3644          *      away.  This helps get rid of zxombie children.
3645          */
3646         while (waitpid(-1, &argval, WNOHANG) > 0) {
3647                 /* do nothing */
3648         }
3649 #endif
3650
3651 }
3652
3653 /*
3654  *      Externally-visibly functions.
3655  */
3656 int radius_event_init(CONF_SECTION *cs, int spawn_flag)
3657 {
3658         rad_listen_t *this, *head = NULL;
3659
3660         if (el) return 0;
3661
3662         time(&fr_start_time);
3663
3664         el = fr_event_list_create(event_status);
3665         if (!el) return 0;
3666
3667         pl = fr_packet_list_create(0);
3668         if (!pl) return 0;      /* leak el */
3669
3670         request_num_counter = 0;
3671
3672 #ifdef WITH_PROXY
3673         if (mainconfig.proxy_requests) {
3674                 pthread_mutexattr_t attr;
3675
3676                 /*
3677                  *      Create the tree for managing proxied requests and
3678                  *      responses.
3679                  */
3680                 proxy_list = fr_packet_list_create(1);
3681                 if (!proxy_list) return 0;
3682
3683 #ifdef HAVE_PTHREAD_H
3684                 pthread_mutexattr_init(&attr);
3685
3686 #ifdef PTHREAD_MUTEX_RECURSIVE
3687                 if (pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_RECURSIVE) < 0) {
3688                         radlog(L_ERR, "FATAL: Failed to set type for proxy mutex: %s",
3689                                strerror(errno));
3690                         exit(1);
3691                 }
3692 #endif
3693
3694                 if (pthread_mutex_init(&proxy_mutex, NULL) != 0) {
3695                         radlog(L_ERR, "FATAL: Failed to initialize proxy mutex: %s",
3696                                strerror(errno));
3697                         exit(1);
3698                 }
3699
3700                 pthread_mutexattr_destroy(&attr);
3701 #endif
3702         }
3703 #endif
3704
3705         /*
3706          *      Just before we spawn the child threads, force the log
3707          *      subsystem to re-open the log file for every write.
3708          */
3709         if (spawn_flag) force_log_reopen();
3710
3711 #ifdef HAVE_PTHREAD_H
3712 #ifndef __MINGW32__
3713         NO_SUCH_CHILD_PID = (pthread_t ) (0);
3714 #else
3715         NO_SUCH_CHILD_PID = pthread_self(); /* not a child thread */
3716 #endif
3717         /*
3718          *      Initialize the threads ONLY if we're spawning, AND
3719          *      we're running normally.
3720          */
3721         if (spawn_flag && !check_config &&
3722             (thread_pool_init(cs, &spawn_flag) < 0)) {
3723                 exit(1);
3724         }
3725 #endif
3726
3727         /*
3728          *      Move all of the thread calls to this file?
3729          *
3730          *      It may be best for the mutexes to be in this file...
3731          */
3732         have_children = spawn_flag;
3733
3734         if (check_config) {
3735                 DEBUG("%s: #### Skipping IP addresses and Ports ####",
3736                        mainconfig.name);
3737                 return 1;
3738         }
3739
3740 #ifdef WITH_SELF_PIPE
3741         /*
3742          *      Child threads need a pipe to signal us, as do the
3743          *      signal handlers.
3744          */
3745         if (pipe(self_pipe) < 0) {
3746                 radlog(L_ERR, "radiusd: Error opening internal pipe: %s",
3747                        strerror(errno));
3748                 exit(1);
3749         }
3750         if (fcntl(self_pipe[0], F_SETFL, O_NONBLOCK | FD_CLOEXEC) < 0) {
3751                 radlog(L_ERR, "radiusd: Error setting internal flags: %s",
3752                        strerror(errno));
3753                 exit(1);
3754         }
3755         if (fcntl(self_pipe[1], F_SETFL, O_NONBLOCK | FD_CLOEXEC) < 0) {
3756                 radlog(L_ERR, "radiusd: Error setting internal flags: %s",
3757                        strerror(errno));
3758                 exit(1);
3759         }
3760
3761         if (!fr_event_fd_insert(el, 0, self_pipe[0],
3762                                   event_signal_handler, el)) {
3763                 radlog(L_ERR, "Failed creating handler for signals");
3764                 exit(1);
3765         }
3766 #endif  /* WITH_SELF_PIPE */
3767
3768 #ifdef WITH_PROXY
3769         /*
3770          *      Mark the proxy Fd's as unused.
3771          */
3772         {
3773                 int i;
3774
3775                 for (i = 0; i < 32; i++) proxy_fds[i] = -1;
3776         }
3777 #endif
3778
3779        DEBUG("%s: #### Opening IP addresses and Ports ####",
3780                mainconfig.name);
3781
3782        /*
3783         *       The server temporarily switches to an unprivileged
3784         *       user very early in the bootstrapping process.
3785         *       However, some sockets MAY require privileged access
3786         *       (bind to device, or to port < 1024, or to raw
3787         *       sockets).  Those sockets need to call suid up/down
3788         *       themselves around the functions that need a privileged
3789         *       uid.
3790         */
3791         if (listen_init(cs, &head) < 0) {
3792                 _exit(1);
3793         }
3794
3795         /*
3796          *      At this point, no one has any business *ever* going
3797          *      back to root uid.
3798          */
3799         fr_suid_down_permanent();
3800
3801         /*
3802          *      Add all of the sockets to the event loop.
3803          */
3804         for (this = head;
3805              this != NULL;
3806              this = this->next) {
3807                 char buffer[256];
3808
3809                 this->print(this, buffer, sizeof(buffer));
3810
3811                 switch (this->type) {
3812 #ifdef WITH_DETAIL
3813                 case RAD_LISTEN_DETAIL:
3814                         DEBUG("Listening on %s", buffer);
3815
3816                         /*
3817                          *      Detail files are always known, and aren't
3818                          *      put into the socket event loop.
3819                          */
3820                         this->status = RAD_LISTEN_STATUS_KNOWN;
3821
3822                         /*
3823                          *      Set up the first poll interval.
3824                          */
3825                         event_poll_detail(this);
3826                         break;
3827 #endif
3828
3829 #ifdef WITH_PROXY
3830                 case RAD_LISTEN_PROXY:
3831                         rad_assert(proxy_fds[this->fd & 0x1f] == -1);
3832                         rad_assert(proxy_listeners[this->fd & 0x1f] == NULL);
3833
3834                         proxy_fds[this->fd & 0x1f] = this->fd;
3835                         proxy_listeners[this->fd & 0x1f] = this;
3836                         if (!fr_packet_list_socket_add(proxy_list,
3837                                                          this->fd)) {
3838                                 rad_assert(0 == 1);
3839                         }
3840                         /* FALL-THROUGH */
3841 #endif
3842
3843                 default:
3844                         break;
3845                 }
3846
3847                 event_new_fd(this);
3848
3849                 this->status = RAD_LISTEN_STATUS_KNOWN;
3850         }
3851
3852         mainconfig.listen = head;
3853
3854         return 1;
3855 }
3856
3857
3858 static int request_hash_cb(UNUSED void *ctx, void *data)
3859 {
3860         REQUEST *request = fr_packet2myptr(REQUEST, packet, data);
3861
3862 #ifdef WITH_PROXY
3863         rad_assert(request->in_proxy_hash == FALSE);
3864 #endif
3865
3866         ev_request_free(&request);
3867
3868         return 0;
3869 }
3870
3871
3872 #ifdef WITH_PROXY
3873 static int proxy_hash_cb(UNUSED void *ctx, void *data)
3874 {
3875         REQUEST *request = fr_packet2myptr(REQUEST, proxy, data);
3876
3877         ev_request_free(&request);
3878
3879         return 0;
3880 }
3881 #endif
3882
3883 void radius_event_free(void)
3884 {
3885         /*
3886          *      FIXME: Stop all threads, or at least check that
3887          *      they're all waiting on the semaphore, and the queues
3888          *      are empty.
3889          */
3890
3891 #ifdef WITH_PROXY
3892         /*
3893          *      There are requests in the proxy hash that aren't
3894          *      referenced from anywhere else.  Remove them first.
3895          */
3896         if (proxy_list) {
3897                 PTHREAD_MUTEX_LOCK(&proxy_mutex);
3898                 fr_packet_list_walk(proxy_list, NULL, proxy_hash_cb);
3899                 PTHREAD_MUTEX_UNLOCK(&proxy_mutex);
3900                 fr_packet_list_free(proxy_list);
3901                 proxy_list = NULL;
3902         }
3903 #endif
3904
3905         fr_packet_list_walk(pl, NULL, request_hash_cb);
3906
3907         fr_packet_list_free(pl);
3908         pl = NULL;
3909
3910         fr_event_list_free(el);
3911 }
3912
3913 int radius_event_process(void)
3914 {
3915         if (!el) return 0;
3916
3917         return fr_event_loop(el);
3918 }
3919
3920 void radius_handle_request(REQUEST *request, RAD_REQUEST_FUNP fun)
3921 {
3922         request->options = RAD_REQUEST_OPTION_DEBUG2;
3923
3924         if (request_pre_handler(request)) {
3925                 rad_assert(fun != NULL);
3926                 rad_assert(request != NULL);
3927
3928                 if (request->server) RDEBUG("server %s {",
3929                                             request->server != NULL ?
3930                                             request->server : "");
3931                 fun(request);
3932
3933                 if (request->server) RDEBUG("} # server %s",
3934                                              request->server != NULL ?
3935                                             request->server : "");
3936
3937                 request_post_handler(request);
3938         }
3939
3940         DEBUG2("Going to the next request");
3941         return;
3942 }