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 static rad_listen_t *proxy_listener_list = NULL;
  74 #endif
  75
  76 #define PTHREAD_MUTEX_LOCK if (have_children) pthread_mutex_lock
  77 #define PTHREAD_MUTEX_UNLOCK if (have_children) pthread_mutex_unlock
  78
  79 static pthread_t NO_SUCH_CHILD_PID;
  80 #else
  81 /*
  82  *      This is easier than ifdef's throughout the code.
  83  */
  84 #define PTHREAD_MUTEX_LOCK(_x)
  85 #define PTHREAD_MUTEX_UNLOCK(_x)
  86 int thread_pool_addrequest(REQUEST *request, RAD_REQUEST_FUNP fun)
  87 {
  88         radius_handle_request(request, fun);
  89         return 1;
  90 }
  91 #endif
  92
  93 /*
  94  *      We need mutexes around the event FD list *only* in certain
  95  *      cases.
  96  */
  97 #if defined (HAVE_PTHREAD_H) && (defined(WITH_PROXY) || defined(WITH_TCP))
  98 static pthread_mutex_t  fd_mutex;
  99 #define FD_MUTEX_LOCK if (have_children) pthread_mutex_lock
 100 #define FD_MUTEX_UNLOCK if (have_children) pthread_mutex_unlock
 101 #else
 102 /*
 103  *      This is easier than ifdef's throughout the code.
 104  */
 105 #define FD_MUTEX_LOCK(_x)
 106 #define FD_MUTEX_UNLOCK(_x)
 107 #endif
 108
 109
 110 #define INSERT_EVENT(_function, _ctx) if (!fr_event_insert(el, _function, _ctx, &((_ctx)->when), &((_ctx)->ev))) { _rad_panic(__FILE__, __LINE__, "Failed to insert event"); }
 111
 112 #ifdef WITH_PROXY
 113 static fr_packet_list_t *proxy_list = NULL;
 114 static void remove_from_proxy_hash(REQUEST *request);
 115
 116 static void check_for_zombie_home_server(REQUEST *request);
 117 #else
 118 #define remove_from_proxy_hash(foo)
 119 #endif
 120
 121 static void request_post_handler(REQUEST *request);
 122 static void wait_a_bit(void *ctx);
 123 static void event_socket_handler(fr_event_list_t *xel, UNUSED int fd, void *ctx);
 124 #ifdef WITH_DETAIL
 125 static void event_poll_detail(void *ctx);
 126 #endif
 127
 128 static void NEVER_RETURNS _rad_panic(const char *file, unsigned int line,
 129                                     const char *msg)
 130 {
 131         radlog(L_ERR, "[%s:%d] %s", file, line, msg);
 132         _exit(1);
 133 }
 134
 135 #define rad_panic(x) _rad_panic(__FILE__, __LINE__, x)
 136
 137
 138 static void tv_add(struct timeval *tv, int usec_delay)
 139 {
 140         if (usec_delay > USEC) {
 141                 tv->tv_sec += usec_delay / USEC;
 142                 usec_delay %= USEC;
 143         }
 144         tv->tv_usec += usec_delay;
 145
 146         if (tv->tv_usec > USEC) {
 147                 tv->tv_usec -= USEC;
 148                 tv->tv_sec++;
 149         }
 150 }
 151
 152 static void remove_from_request_hash(REQUEST *request)
 153 {
 154         if (!request->in_request_hash) return;
 155
 156         fr_packet_list_yank(pl, request->packet);
 157         request->in_request_hash = FALSE;
 158
 159         request_stats_final(request);
 160
 161 #ifdef WITH_TCP
 162         request->listener->count--;
 163 #endif
 164 }
 165
 166 #ifdef WITH_PROXY
 167 static REQUEST *lookup_in_proxy_hash(RADIUS_PACKET *reply)
 168 {
 169         RADIUS_PACKET **proxy_p;
 170         REQUEST *request;
 171
 172         PTHREAD_MUTEX_LOCK(&proxy_mutex);
 173         proxy_p = fr_packet_list_find_byreply(proxy_list, reply);
 174
 175         if (!proxy_p) {
 176                 PTHREAD_MUTEX_UNLOCK(&proxy_mutex);
 177                 return NULL;
 178         }
 179
 180         request = fr_packet2myptr(REQUEST, proxy, proxy_p);
 181
 182         if (!request) {
 183                 PTHREAD_MUTEX_UNLOCK(&proxy_mutex);
 184                 return NULL;
 185         }
 186
 187         request->num_proxied_responses++;
 188
 189         /*
 190          *      Catch the most common case of everything working
 191          *      correctly.
 192          */
 193         if (request->num_proxied_requests == request->num_proxied_responses) {
 194                 remove_from_proxy_hash(request);
 195         }
 196
 197         PTHREAD_MUTEX_UNLOCK(&proxy_mutex);
 198
 199         return request;
 200 }
 201
 202
 203 static void remove_from_proxy_hash(REQUEST *request)
 204 {
 205         /*
 206          *      Check this without grabbing the mutex because it's a
 207          *      lot faster that way.
 208          */
 209         if (!request->in_proxy_hash) return;
 210
 211         /*
 212          *      The "not in hash" flag is definitive.  However, if the
 213          *      flag says that it IS in the hash, there might still be
 214          *      a race condition where it isn't.
 215          */
 216         PTHREAD_MUTEX_LOCK(&proxy_mutex);
 217
 218         if (!request->in_proxy_hash) {
 219                 PTHREAD_MUTEX_UNLOCK(&proxy_mutex);
 220                 return;
 221         }
 222
 223         fr_packet_list_yank(proxy_list, request->proxy);
 224         fr_packet_list_id_free(proxy_list, request->proxy);
 225
 226         /*
 227          *      On the FIRST reply, decrement the count of outstanding
 228          *      requests.  Note that this is NOT the count of sent
 229          *      packets, but whether or not the home server has
 230          *      responded at all.
 231          */
 232         if (!request->proxy_reply &&
 233             request->home_server &&
 234             request->home_server->currently_outstanding) {
 235                 request->home_server->currently_outstanding--;
 236         }
 237
 238 #ifdef WITH_TCP
 239         request->proxy_listener->count--;
 240         request->proxy_listener = NULL;
 241 #endif
 242
 243         /*
 244          *      Got from YES in hash, to NO, not in hash while we hold
 245          *      the mutex.  This guarantees that when another thread
 246          *      grabs the mutex, the "not in hash" flag is correct.
 247          */
 248         request->in_proxy_hash = FALSE;
 249
 250         PTHREAD_MUTEX_UNLOCK(&proxy_mutex);
 251 }
 252 #endif  /* WITH_PROXY */
 253
 254 static void ev_request_free(REQUEST **prequest)
 255 {
 256         REQUEST *request;
 257
 258         if (!prequest || !*prequest) return;
 259
 260         request = *prequest;
 261
 262 #ifdef WITH_COA
 263         if (request->coa) {
 264                 /*
 265                  *      Divorce the child from the parent first,
 266                  *      then clean up the child.
 267                  */
 268                 request->coa->parent = NULL;
 269                 ev_request_free(&request->coa);
 270         }
 271
 272         /*
 273          *      Divorce the parent from the child, and leave the
 274          *      parent still alive.
 275          */
 276         if (request->parent && (request->parent->coa == request)) {
 277                 request->parent->coa = NULL;
 278         }
 279 #endif
 280
 281         if (request->ev) fr_event_delete(el, &request->ev);
 282 #ifdef WITH_PROXY
 283         if (request->in_proxy_hash) remove_from_proxy_hash(request);
 284 #endif
 285         if (request->in_request_hash) remove_from_request_hash(request);
 286
 287         request_free(prequest);
 288 }
 289
 290 #ifdef WITH_TCP
 291 static int remove_all_requests(void *ctx, void *data)
 292 {
 293         rad_listen_t *this = ctx;
 294         RADIUS_PACKET **packet_p = data;
 295         REQUEST *request;
 296
 297         request = fr_packet2myptr(REQUEST, packet, packet_p);
 298         if (request->packet->sockfd != this->fd) return 0;
 299
 300         switch (request->child_state) {
 301         case REQUEST_RUNNING:
 302                 rad_assert(request->ev != NULL); /* or it's lost forever */
 303         case REQUEST_QUEUED:
 304                 request->master_state = REQUEST_STOP_PROCESSING;
 305                 return 0;
 306
 307                 /*
 308                  *      Waiting for a reply.  There's no point in
 309                  *      doing anything else.  We remove it from the
 310                  *      request hash so that we can close the upstream
 311                  *      socket.
 312                  */
 313         case REQUEST_PROXIED:
 314                 remove_from_request_hash(request);
 315                 request->child_state = REQUEST_DONE;
 316                 return 0;
 317
 318         case REQUEST_REJECT_DELAY:
 319         case REQUEST_CLEANUP_DELAY:
 320         case REQUEST_DONE:
 321                 ev_request_free(&request);
 322                 break;
 323         }
 324
 325         return 0;
 326 }
 327
 328 #ifdef WITH_PROXY
 329 static int remove_all_proxied_requests(void *ctx, void *data)
 330 {
 331         rad_listen_t *this = ctx;
 332         RADIUS_PACKET **proxy_p = data;
 333         REQUEST *request;
 334
 335         request = fr_packet2myptr(REQUEST, proxy, proxy_p);
 336         if (request->proxy->sockfd != this->fd) return 0;
 337
 338         switch (request->child_state) {
 339         case REQUEST_RUNNING:
 340                 rad_assert(request->ev != NULL); /* or it's lost forever */
 341         case REQUEST_QUEUED:
 342                 request->master_state = REQUEST_STOP_PROCESSING;
 343                 return 0;
 344
 345                 /*
 346                  *      Eventually we will discover that there is no
 347                  *      response to the proxied request.
 348                  */
 349         case REQUEST_PROXIED:
 350                 break;
 351
 352                 /*
 353                  *      Keep it in the cache for duplicate detection.
 354                  */
 355         case REQUEST_REJECT_DELAY:
 356         case REQUEST_CLEANUP_DELAY:
 357         case REQUEST_DONE:
 358                 break;
 359         }
 360
 361         remove_from_proxy_hash(request);
 362         return 0;
 363 }
 364 #endif  /* WITH_PROXY */
 365 #endif  /* WITH_TCP */
 366
 367
 368 #ifdef WITH_PROXY
 369 static int proxy_id_alloc(REQUEST *request, RADIUS_PACKET *packet)
 370 {
 371         void *proxy_listener;
 372
 373         if (fr_packet_list_id_alloc(proxy_list, request->home_server->proto,
 374                                     packet, &proxy_listener)) {
 375                 request->proxy_listener = proxy_listener;
 376                 return 1;
 377         }
 378
 379         if (!proxy_new_listener(request->home_server, 0)) {
 380                 RDEBUG2("ERROR: Failed to create a new socket for proxying requests.");
 381                 return 0;
 382         }
 383
 384         if (!fr_packet_list_id_alloc(proxy_list, request->home_server->proto,
 385                                      packet, &proxy_listener)) {
 386                 RDEBUG2("ERROR: Failed allocating Id for new socket when proxying requests.");
 387                 return 0;
 388         }
 389
 390         request->proxy_listener = proxy_listener;
 391         return 1;
 392 }
 393
 394
 395 static int insert_into_proxy_hash(REQUEST *request, int retransmit)
 396 {
 397         char buf[128];
 398
 399         rad_assert(request->proxy != NULL);
 400         rad_assert(proxy_list != NULL);
 401
 402         PTHREAD_MUTEX_LOCK(&proxy_mutex);
 403
 404         if (!retransmit) {
 405                 if (!proxy_id_alloc(request, request->proxy)) {
 406                         PTHREAD_MUTEX_UNLOCK(&proxy_mutex);
 407                         return 0;
 408                 }
 409         } else {
 410                 RADIUS_PACKET packet;
 411
 412 #ifdef WITH_TCP
 413                 rad_assert(request->home_server->proto != IPPROTO_TCP);
 414 #endif
 415
 416                 packet = *request->proxy;
 417
 418                 if (!proxy_id_alloc(request, &packet)) {
 419                         PTHREAD_MUTEX_UNLOCK(&proxy_mutex);
 420                         return 0;
 421                 }
 422
 423                 /*
 424                  *      Yank the request, free the old Id, and
 425                  *      remember the new Id.
 426                  */
 427                 fr_packet_list_yank(proxy_list, request->proxy);
 428                 fr_packet_list_id_free(proxy_list, request->proxy);
 429                 *request->proxy = packet;
 430         }
 431
 432         if (!fr_packet_list_insert(proxy_list, &request->proxy)) {
 433                 fr_packet_list_id_free(proxy_list, request->proxy);
 434                 PTHREAD_MUTEX_UNLOCK(&proxy_mutex);
 435                 RDEBUG2("ERROR: Failed to insert entry into proxy list");
 436                 return 0;
 437         }
 438
 439         request->in_proxy_hash = TRUE;
 440
 441         /*
 442          *      Keep track of maximum outstanding requests to a
 443          *      particular home server.  'max_outstanding' is
 444          *      enforced in home_server_ldb(), in realms.c.
 445          */
 446         if (request->home_server) {
 447                 request->home_server->currently_outstanding++;
 448         }
 449
 450 #ifdef WITH_TCP
 451         request->proxy_listener->count++;
 452 #endif
 453
 454         PTHREAD_MUTEX_UNLOCK(&proxy_mutex);
 455
 456         RDEBUG3(" proxy: allocating destination %s port %d - Id %d",
 457                inet_ntop(request->proxy->dst_ipaddr.af,
 458                          &request->proxy->dst_ipaddr.ipaddr, buf, sizeof(buf)),
 459                request->proxy->dst_port,
 460                request->proxy->id);
 461
 462         return 1;
 463 }
 464
 465
 466 /*
 467  *      Called as BOTH an event, and in-line from other functions.
 468  */
 469 static void wait_for_proxy_id_to_expire(void *ctx)
 470 {
 471         REQUEST *request = ctx;
 472
 473         rad_assert(request->magic == REQUEST_MAGIC);
 474         rad_assert(request->proxy != NULL);
 475
 476         if (!fr_event_now(el, &now)) gettimeofday(&now, NULL);
 477         request->when = request->proxy_when;
 478
 479 #ifdef WITH_COA
 480         if (((request->proxy->code == PW_COA_REQUEST) ||
 481              (request->proxy->code == PW_DISCONNECT_REQUEST)) &&
 482             (request->packet->code != request->proxy->code)) {
 483                 request->when.tv_sec += request->home_server->coa_mrd;
 484         } else
 485 #endif
 486         request->when.tv_sec += request->home_server->response_window;
 487
 488         if ((request->num_proxied_requests == request->num_proxied_responses) ||
 489 #ifdef WITH_TCP
 490             (request->home_server->proto == IPPROTO_TCP) ||
 491 #endif
 492             timercmp(&now, &request->when, >)) {
 493                 if (request->packet) {
 494                         RDEBUG2("Cleaning up request %d ID %d with timestamp +%d",
 495                                request->number, request->packet->id,
 496                                (unsigned int) (request->timestamp - fr_start_time));
 497                 } else {
 498                         RDEBUG2("Cleaning up request %d with timestamp +%d",
 499                                request->number,
 500                                (unsigned int) (request->timestamp - fr_start_time));
 501                 }
 502
 503                 ev_request_free(&request);
 504                 return;
 505         }
 506
 507         INSERT_EVENT(wait_for_proxy_id_to_expire, request);
 508 }
 509 #endif
 510
 511 #ifdef HAVE_PTHREAD_H
 512 static void wait_for_child_to_die(void *ctx)
 513 {
 514         REQUEST *request = ctx;
 515
 516         rad_assert(request->magic == REQUEST_MAGIC);
 517
 518         if ((request->child_state == REQUEST_QUEUED) ||
 519             (request->child_state == REQUEST_RUNNING)) {
 520                 request->delay += (request->delay >> 1);
 521                 tv_add(&request->when, request->delay);
 522
 523                 RDEBUG2("Child is still stuck for request %d", request->number);
 524
 525                 INSERT_EVENT(wait_for_child_to_die, request);
 526                 return;
 527         }
 528
 529         RDEBUG2("Child is responsive for request %d", request->number);
 530         remove_from_request_hash(request);
 531
 532 #ifdef WITH_PROXY
 533         if (request->proxy) {
 534                 wait_for_proxy_id_to_expire(request);
 535                 return;
 536         }
 537 #endif
 538
 539         ev_request_free(&request);
 540 }
 541 #endif
 542
 543 static void cleanup_delay(void *ctx)
 544 {
 545         REQUEST *request = ctx;
 546
 547         rad_assert(request->magic == REQUEST_MAGIC);
 548         rad_assert((request->child_state == REQUEST_CLEANUP_DELAY) ||
 549                    (request->child_state == REQUEST_DONE));
 550
 551         remove_from_request_hash(request);
 552
 553 #ifdef WITH_PROXY
 554         if (request->proxy && request->in_proxy_hash) {
 555                 wait_for_proxy_id_to_expire(request);
 556                 return;
 557         }
 558 #endif
 559
 560         RDEBUG2("Cleaning up request %d ID %d with timestamp +%d",
 561                request->number, request->packet->id,
 562                (unsigned int) (request->timestamp - fr_start_time));
 563
 564         ev_request_free(&request);
 565 }
 566
 567
 568 /*
 569  *      In daemon mode, AND this request has debug flags set.
 570  */
 571 #define DEBUG_PACKET if (!debug_flag && request->options && request->radlog) debug_packet
 572
 573 static void debug_packet(REQUEST *request, RADIUS_PACKET *packet, int direction)
 574 {
 575         VALUE_PAIR *vp;
 576         char buffer[1024];
 577         const char *received, *from;
 578         const fr_ipaddr_t *ip;
 579         int port;
 580
 581         if (!packet) return;
 582
 583         rad_assert(request->radlog != NULL);
 584
 585         if (direction == 0) {
 586                 received = "Received";
 587                 from = "from";  /* what else? */
 588                 ip = &packet->src_ipaddr;
 589                 port = packet->src_port;
 590
 591         } else {
 592                 received = "Sending";
 593                 from = "to";    /* hah! */
 594                 ip = &packet->dst_ipaddr;
 595                 port = packet->dst_port;
 596         }
 597
 598         /*
 599          *      Client-specific debugging re-prints the input
 600          *      packet into the client log.
 601          *
 602          *      This really belongs in a utility library
 603          */
 604         if ((packet->code > 0) && (packet->code < FR_MAX_PACKET_CODE)) {
 605                 RDEBUG("%s %s packet %s host %s port %d, id=%d, length=%d",
 606                        received, fr_packet_codes[packet->code], from,
 607                        inet_ntop(ip->af, &ip->ipaddr, buffer, sizeof(buffer)),
 608                        port, packet->id, packet->data_len);
 609         } else {
 610                 RDEBUG("%s packet %s host %s port %d code=%d, id=%d, length=%d",
 611                        received, from,
 612                        inet_ntop(ip->af, &ip->ipaddr, buffer, sizeof(buffer)),
 613                        port,
 614                        packet->code, packet->id, packet->data_len);
 615         }
 616
 617         for (vp = packet->vps; vp != NULL; vp = vp->next) {
 618                 vp_prints(buffer, sizeof(buffer), vp);
 619                 request->radlog(L_DBG, 0, request, "\t%s", buffer);
 620         }
 621 }
 622
 623 static void reject_delay(void *ctx)
 624 {
 625         REQUEST *request = ctx;
 626
 627         rad_assert(request->magic == REQUEST_MAGIC);
 628         rad_assert(request->child_state == REQUEST_REJECT_DELAY);
 629
 630         RDEBUG2("Sending delayed reject for request %d", request->number);
 631
 632         DEBUG_PACKET(request, request->reply, 1);
 633
 634         request->listener->send(request->listener, request);
 635
 636         request->when.tv_sec += request->root->cleanup_delay;
 637         request->child_state = REQUEST_CLEANUP_DELAY;
 638
 639         INSERT_EVENT(cleanup_delay, request);
 640 }
 641
 642
 643 #ifdef WITH_PROXY
 644 void revive_home_server(void *ctx)
 645 {
 646         home_server *home = ctx;
 647         char buffer[128];
 648
 649 #ifdef WITH_TCP
 650         rad_assert(home->proto != IPPROTO_TCP);
 651 #endif
 652
 653         home->state = HOME_STATE_ALIVE;
 654         home->currently_outstanding = 0;
 655         home->revive_time = now;
 656
 657         /*
 658          *      Delete any outstanding events.
 659          */
 660         if (home->ev) fr_event_delete(el, &home->ev);
 661
 662         radlog(L_INFO, "PROXY: Marking home server %s port %d alive again... we have no idea if it really is alive or not.",
 663                inet_ntop(home->ipaddr.af, &home->ipaddr.ipaddr,
 664                          buffer, sizeof(buffer)),
 665                home->port);
 666
 667 }
 668
 669
 670 static void no_response_to_ping(void *ctx)
 671 {
 672         REQUEST *request = ctx;
 673         home_server *home;
 674         char buffer[128];
 675
 676         rad_assert(request->home_server != NULL);
 677
 678         home = request->home_server;
 679 #ifdef WITH_TCP
 680         rad_assert(home->proto != IPPROTO_TCP);
 681 #endif
 682
 683         home->num_received_pings = 0;
 684
 685         RDEBUG2("No response to status check %d from home server %s port %d",
 686                request->number,
 687                inet_ntop(request->proxy->dst_ipaddr.af,
 688                          &request->proxy->dst_ipaddr.ipaddr,
 689                          buffer, sizeof(buffer)),
 690                request->proxy->dst_port);
 691
 692         check_for_zombie_home_server(request);
 693
 694         wait_for_proxy_id_to_expire(request);
 695 }
 696
 697
 698 static void received_response_to_ping(REQUEST *request)
 699 {
 700         home_server *home;
 701         char buffer[128];
 702
 703         rad_assert(request->home_server != NULL);
 704
 705         home = request->home_server;
 706 #ifdef WITH_TCP
 707         rad_assert(home->proto != IPPROTO_TCP);
 708 #endif
 709
 710         home->num_received_pings++;
 711
 712         RDEBUG2("Received response to status check %d (%d in current sequence)",
 713                request->number, home->num_received_pings);
 714
 715         /*
 716          *      Remove the request from any hashes
 717          */
 718         fr_event_delete(el, &request->ev);
 719         remove_from_proxy_hash(request);
 720         rad_assert(request->in_request_hash == FALSE);
 721
 722         /*
 723          *      The control socket may have marked the home server as
 724          *      alive.  OR, it may have suddenly started responding to
 725          *      requests again.  If so, don't re-do the "make alive"
 726          *      work.
 727          */
 728         if (home->state == HOME_STATE_ALIVE) return;
 729
 730         /*
 731          *      We haven't received enough ping responses to mark it
 732          *      "alive".  Wait a bit.
 733          */
 734         if (home->num_received_pings < home->num_pings_to_alive) {
 735                 return;
 736         }
 737
 738         home->state = HOME_STATE_ALIVE;
 739         home->currently_outstanding = 0;
 740         home->revive_time = now;
 741
 742         if (!fr_event_delete(el, &home->ev)) {
 743                 RDEBUG2("Hmm... no event for home server.  Oh well.");
 744         }
 745
 746         radlog(L_INFO, "PROXY: Marking home server %s port %d alive",
 747                inet_ntop(request->proxy->dst_ipaddr.af,
 748                          &request->proxy->dst_ipaddr.ipaddr,
 749                          buffer, sizeof(buffer)),
 750                request->proxy->dst_port);
 751 }
 752
 753
 754 /*
 755  *      Called from start of zombie period, OR after control socket
 756  *      marks the home server dead.
 757  */
 758 static void ping_home_server(void *ctx)
 759 {
 760         uint32_t jitter;
 761         home_server *home = ctx;
 762         REQUEST *request;
 763         VALUE_PAIR *vp;
 764
 765 #ifdef WITH_TCP
 766         rad_assert(home->proto != IPPROTO_TCP);
 767 #endif
 768
 769         if ((home->state == HOME_STATE_ALIVE) ||
 770             (home->ping_check == HOME_PING_CHECK_NONE) ||
 771             (home->ev != NULL)) {
 772                 return;
 773         }
 774
 775         request = request_alloc();
 776         request->number = request_num_counter++;
 777
 778         request->proxy = rad_alloc(1);
 779         rad_assert(request->proxy != NULL);
 780
 781         fr_event_now(el, &request->when);
 782         home->when = request->when;
 783
 784         if (home->ping_check == HOME_PING_CHECK_STATUS_SERVER) {
 785                 request->proxy->code = PW_STATUS_SERVER;
 786
 787                 radius_pairmake(request, &request->proxy->vps,
 788                                 "Message-Authenticator", "0x00", T_OP_SET);
 789
 790         } else if (home->type == HOME_TYPE_AUTH) {
 791                 request->proxy->code = PW_AUTHENTICATION_REQUEST;
 792
 793                 radius_pairmake(request, &request->proxy->vps,
 794                                 "User-Name", home->ping_user_name, T_OP_SET);
 795                 radius_pairmake(request, &request->proxy->vps,
 796                                 "User-Password", home->ping_user_password, T_OP_SET);
 797                 radius_pairmake(request, &request->proxy->vps,
 798                                 "Service-Type", "Authenticate-Only", T_OP_SET);
 799                 radius_pairmake(request, &request->proxy->vps,
 800                                 "Message-Authenticator", "0x00", T_OP_SET);
 801
 802         } else {
 803 #ifdef WITH_ACCOUNTING
 804                 request->proxy->code = PW_ACCOUNTING_REQUEST;
 805
 806                 radius_pairmake(request, &request->proxy->vps,
 807                                 "User-Name", home->ping_user_name, T_OP_SET);
 808                 radius_pairmake(request, &request->proxy->vps,
 809                                 "Acct-Status-Type", "Stop", T_OP_SET);
 810                 radius_pairmake(request, &request->proxy->vps,
 811                                 "Acct-Session-Id", "00000000", T_OP_SET);
 812                 vp = radius_pairmake(request, &request->proxy->vps,
 813                                      "Event-Timestamp", "0", T_OP_SET);
 814                 vp->vp_date = now.tv_sec;
 815 #else
 816                 rad_assert("Internal sanity check failed");
 817 #endif
 818         }
 819
 820         radius_pairmake(request, &request->proxy->vps,
 821                         "NAS-Identifier", "Status Check. Are you alive?",
 822                         T_OP_SET);
 823
 824         request->proxy->dst_ipaddr = home->ipaddr;
 825         request->proxy->dst_port = home->port;
 826         request->home_server = home;
 827
 828         rad_assert(request->proxy_listener == NULL);
 829
 830         if (!insert_into_proxy_hash(request, FALSE)) {
 831                 RDEBUG2("ERROR: Failed inserting status check %d into proxy hash.  Discarding it.",
 832                        request->number);
 833                 ev_request_free(&request);
 834                 return;
 835         }
 836         rad_assert(request->proxy_listener != NULL);
 837         request->proxy_listener->send(request->proxy_listener,
 838                                       request);
 839
 840         request->next_callback = NULL;
 841         request->child_state = REQUEST_PROXIED;
 842         request->when.tv_sec += home->ping_timeout;;
 843
 844         INSERT_EVENT(no_response_to_ping, request);
 845
 846         /*
 847          *      Add +/- 2s of jitter, as suggested in RFC 3539
 848          *      and in the Issues and Fixes draft.
 849          */
 850         home->when.tv_sec += home->ping_interval - 2;
 851
 852         jitter = fr_rand();
 853         jitter ^= (jitter >> 10);
 854         jitter &= ((1 << 23) - 1); /* 22 bits of 1 */
 855
 856         tv_add(&home->when, jitter);
 857
 858         INSERT_EVENT(ping_home_server, home);
 859 }
 860
 861
 862 void mark_home_server_dead(home_server *home, struct timeval *when)
 863 {
 864         int previous_state = home->state;
 865         char buffer[128];
 866
 867         radlog(L_INFO, "PROXY: Marking home server %s port %d as dead.",
 868                inet_ntop(home->ipaddr.af, &home->ipaddr.ipaddr,
 869                          buffer, sizeof(buffer)),
 870                home->port);
 871
 872         home->state = HOME_STATE_IS_DEAD;
 873         home->num_received_pings = 0;
 874
 875         if (home->ping_check != HOME_PING_CHECK_NONE) {
 876                 /*
 877                  *      If the control socket marks us dead, start
 878                  *      pinging.  Otherwise, we already started
 879                  *      pinging when it was marked "zombie".
 880                  */
 881                 if (previous_state == HOME_STATE_ALIVE) {
 882                         ping_home_server(home);
 883                 }
 884
 885         } else {
 886                 /*
 887                  *      Revive it after a fixed period of time.  This
 888                  *      is very, very, bad.
 889                  */
 890                 home->when = *when;
 891                 home->when.tv_sec += home->revive_interval;
 892
 893                 INSERT_EVENT(revive_home_server, home);
 894         }
 895 }
 896
 897 static void check_for_zombie_home_server(REQUEST *request)
 898 {
 899         home_server *home;
 900         struct timeval when;
 901
 902         home = request->home_server;
 903
 904         if (home->state != HOME_STATE_ZOMBIE) return;
 905
 906         when = home->zombie_period_start;
 907         when.tv_sec += home->zombie_period;
 908
 909         fr_event_now(el, &now);
 910         if (timercmp(&now, &when, <)) {
 911                 return;
 912         }
 913
 914         mark_home_server_dead(home, &request->when);
 915 }
 916
 917 static int proxy_to_virtual_server(REQUEST *request);
 918
 919 static int virtual_server_handler(UNUSED REQUEST *request)
 920 {
 921         proxy_to_virtual_server(request);
 922         return 0;
 923 }
 924
 925 static void proxy_fallback_handler(REQUEST *request)
 926 {
 927         /*
 928          *      A proper time is required for wait_a_bit.
 929          */
 930         request->delay = USEC / 10;
 931         gettimeofday(&now, NULL);
 932         request->next_when = now;
 933         tv_add(&request->next_when, request->delay);
 934         request->next_callback = wait_a_bit;
 935
 936         /*
 937          *      Re-queue the request.
 938          */
 939         request->child_state = REQUEST_QUEUED;
 940
 941         rad_assert(request->proxy != NULL);
 942         if (!thread_pool_addrequest(request, virtual_server_handler)) {
 943                 request->child_state = REQUEST_DONE;
 944         }
 945
 946 #ifdef HAVE_PTHREAD_H
 947         /*
 948          *      MAY free the request if we're over max_request_time,
 949          *      AND we're not in threaded mode!
 950          *
 951          *      Note that we call this ONLY if we're threaded, as
 952          *      if we're NOT threaded, request_post_handler() calls
 953          *      wait_a_bit(), which means that "request" may not
 954          *      exist any more...
 955          */
 956         if (have_children) wait_a_bit(request);
 957 #endif
 958 }
 959
 960
 961 static int setup_post_proxy_fail(REQUEST *request)
 962 {
 963         DICT_VALUE *dval = NULL;
 964         VALUE_PAIR *vp;
 965
 966         request->child_state = REQUEST_RUNNING;
 967
 968         if (request->packet->code == PW_AUTHENTICATION_REQUEST) {
 969                 dval = dict_valbyname(PW_POST_PROXY_TYPE, "Fail-Authentication");
 970
 971         } else if (request->packet->code == PW_ACCOUNTING_REQUEST) {
 972                 dval = dict_valbyname(PW_POST_PROXY_TYPE, "Fail-Accounting");
 973
 974 #ifdef WITH_COA
 975                 /*
 976                  *      See no_response_to_coa_request
 977                  */
 978         } else if (((request->packet->code >> 8) & 0xff) == PW_COA_REQUEST) {
 979                 request->packet->code &= 0xff; /* restore it */
 980
 981                 if (request->proxy->code == PW_COA_REQUEST) {
 982                         dval = dict_valbyname(PW_POST_PROXY_TYPE, "Fail-CoA");
 983
 984                 } else if (request->proxy->code == PW_DISCONNECT_REQUEST) {
 985                         dval = dict_valbyname(PW_POST_PROXY_TYPE, "Fail-Disconnect");
 986                 } else {
 987                         return 0;
 988                 }
 989
 990 #endif
 991         } else {
 992                 return 0;
 993         }
 994
 995         if (!dval) dval = dict_valbyname(PW_POST_PROXY_TYPE, "Fail");
 996
 997         if (!dval) {
 998                 pairdelete(&request->config_items, PW_POST_PROXY_TYPE);
 999                 return 0;
1000         }
1001
1002         vp = pairfind(request->config_items, PW_POST_PROXY_TYPE);
1003         if (!vp) vp = radius_paircreate(request, &request->config_items,
1004                                         PW_POST_PROXY_TYPE, PW_TYPE_INTEGER);
1005         vp->vp_integer = dval->value;
1006
1007         rad_assert(request->proxy_reply == NULL);
1008
1009         return 1;
1010 }
1011
1012
1013 static int null_handler(UNUSED REQUEST *request)
1014 {
1015         return 0;
1016 }
1017
1018 static void post_proxy_fail_handler(REQUEST *request)
1019 {
1020         /*
1021          *      A proper time is required for wait_a_bit.
1022          */
1023         request->delay = USEC / 10;
1024         gettimeofday(&now, NULL);
1025
1026         /*
1027          *      Not set up to run Post-Proxy-Type = Fail.
1028          *
1029          *      Mark the request as still running, and figure out what
1030          *      to do next.
1031          */
1032         if (!setup_post_proxy_fail(request)) {
1033                 request_post_handler(request);
1034
1035         } else {
1036                 /*
1037                  *      Re-queue the request.
1038                  */
1039                 request->child_state = REQUEST_QUEUED;
1040
1041                 /*
1042                  *      There is a post-proxy-type of fail.  We run
1043                  *      the request through the pre/post proxy
1044                  *      handlers, just like it was a real proxied
1045                  *      request.  However, we set the per-request
1046                  *      handler to NULL, as we don't want to do
1047                  *      anything else.
1048                  *
1049                  *      Note that when we're not threaded, this will
1050                  *      process the request even if it's greater than
1051                  *      max_request_time.  That's not fatal.
1052                  */
1053                 request->priority = 0;
1054                 rad_assert(request->proxy != NULL);
1055                 thread_pool_addrequest(request, null_handler);
1056         }
1057
1058         /*
1059          *      MAY free the request if we're over max_request_time,
1060          *      AND we're not in threaded mode!
1061          *
1062          *      Note that we call this ONLY if we're threaded, as
1063          *      if we're NOT threaded, request_post_handler() calls
1064          *      wait_a_bit(), which means that "request" may not
1065          *      exist any more...
1066          */
1067         if (have_children) wait_a_bit(request);
1068 }
1069
1070 /* maybe check this against wait_for_proxy_id_to_expire? */
1071 static void no_response_to_proxied_request(void *ctx)
1072 {
1073         REQUEST *request = ctx;
1074         home_server *home;
1075         char buffer[128];
1076
1077         rad_assert(request->magic == REQUEST_MAGIC);
1078
1079         if (request->master_state == REQUEST_STOP_PROCESSING) {
1080                 ev_request_free(&request);
1081                 return;
1082         }
1083
1084         rad_assert(request->child_state == REQUEST_PROXIED);
1085
1086         /*
1087          *      If we've failed over to an internal home server,
1088          *      replace the callback with the correct one.  This
1089          *      is due to locking issues with child threads...
1090          */
1091         if (request->home_server->server) {
1092                 wait_a_bit(request);
1093                 return;
1094         }
1095
1096 #ifdef WITH_TCP
1097         if (request->home_server->proto != IPPROTO_TCP)
1098 #endif
1099                 check_for_zombie_home_server(request);
1100
1101         home = request->home_server;
1102
1103         /*
1104          *      The default as of 2.1.7 is to allow requests to
1105          *      fail-over to a backup home server when this one does
1106          *      not respond.  The old behavior can be configured as
1107          *      well.
1108          */
1109         if (home->no_response_fail) {
1110                 radlog(L_ERR, "Rejecting request %d (proxy Id %d) due to lack of any response from home server %s port %d",
1111                        request->number, request->proxy->id,
1112                        inet_ntop(request->proxy->dst_ipaddr.af,
1113                                  &request->proxy->dst_ipaddr.ipaddr,
1114                                  buffer, sizeof(buffer)),
1115                        request->proxy->dst_port);
1116
1117                 post_proxy_fail_handler(request);
1118         } else {
1119                 /*
1120                  *      Ensure that there is a callback for the request.
1121                  */
1122                 request->child_state = REQUEST_RUNNING;
1123                 wait_a_bit(request);
1124         }
1125
1126         /*
1127          *      Don't touch request due to race conditions
1128          */
1129
1130 #ifdef WITH_TCP
1131         /*
1132          *      Do nothing more.  The home server didn't respond,
1133          *      but that isn't a catastrophic failure.  Some home
1134          *      servers don't respond to packets...
1135          */
1136         if (home->proto == IPPROTO_TCP) {
1137                 /*
1138                  *      FIXME: Set up TCP pinging on this connection.
1139                  *
1140                  *      Maybe the CONNECTION is dead, but the home
1141                  *      server is alive.  In that case, we need to start
1142                  *      pinging on the connection.
1143                  *
1144                  *      This means doing the pinging BEFORE the
1145                  *      post_proxy_fail_handler above, as it may do
1146                  *      something with the request, and cause the
1147                  *      proxy listener to go away!
1148                  */
1149                 return;
1150         }
1151 #endif
1152
1153         if (home->state == HOME_STATE_IS_DEAD) {
1154                 rad_assert(home->ev != NULL); /* or it will never wake up */
1155                 return;
1156         }
1157
1158         /*
1159          *      Enable the zombie period when we notice that the home
1160          *      server hasn't responded.  We do NOT back-date the start
1161          *      of the zombie period.
1162          */
1163         if (home->state == HOME_STATE_ALIVE) {
1164                 home->state = HOME_STATE_ZOMBIE;
1165                 home->zombie_period_start = now;
1166
1167                 radlog(L_ERR, "PROXY: Marking home server %s port %d as zombie (it looks like it is dead).",
1168                        inet_ntop(home->ipaddr.af, &home->ipaddr.ipaddr,
1169                                  buffer, sizeof(buffer)),
1170                        home->port);
1171
1172                 /*
1173                  *      Start pinging the home server.
1174                  */
1175                 ping_home_server(home);
1176         }
1177 }
1178 #endif
1179
1180 static void wait_a_bit(void *ctx)
1181 {
1182         struct timeval when;
1183         REQUEST *request = ctx;
1184         fr_event_callback_t callback = NULL;
1185
1186         rad_assert(request->magic == REQUEST_MAGIC);
1187
1188         /*
1189          *      The socket was closed.  Tell the request that
1190          *      there is no point in continuing.
1191          */
1192         if (request->listener->status != RAD_LISTEN_STATUS_KNOWN) {
1193                 goto stop_processing;
1194         }
1195
1196 #ifdef WITH_COA
1197         /*
1198          *      The CoA request is a new (internally generated)
1199          *      request, created in a child thread.  We therefore need
1200          *      some way to tie its events back into the main event
1201          *      handler.
1202          */
1203         if (request->coa && !request->coa->proxy_reply &&
1204             request->coa->next_callback) {
1205                 request->coa->when = request->coa->next_when;
1206                 INSERT_EVENT(request->coa->next_callback, request->coa);
1207                 request->coa->next_callback = NULL;
1208                 request->coa->parent = NULL;
1209                 request->coa = NULL;
1210         }
1211 #endif
1212
1213         switch (request->child_state) {
1214         case REQUEST_QUEUED:
1215         case REQUEST_RUNNING:
1216                 when = request->received;
1217                 when.tv_sec += request->root->max_request_time;
1218
1219                 /*
1220                  *      Normally called from the event loop with the
1221                  *      proper event loop time.  Otherwise, called from
1222                  *      post proxy fail handler, which sets "now", and
1223                  *      this call won't re-set it, because we're not
1224                  *      in the event loop.
1225                  */
1226                 fr_event_now(el, &now);
1227
1228                 /*
1229                  *      Request still has more time.  Continue
1230                  *      waiting.
1231                  */
1232                 if (timercmp(&now, &when, <) ||
1233                     ((request->listener->type == RAD_LISTEN_DETAIL) &&
1234                      (request->child_state == REQUEST_QUEUED))) {
1235                         if (request->delay < (USEC / 10)) {
1236                                 request->delay = USEC / 10;
1237                         }
1238                         request->delay += request->delay >> 1;
1239
1240 #ifdef WITH_DETAIL
1241                         /*
1242                          *      Cap wait at some sane value for detail
1243                          *      files.
1244                          */
1245                         if ((request->listener->type == RAD_LISTEN_DETAIL) &&
1246                             (request->delay > (request->root->max_request_time * USEC))) {
1247                                 request->delay = request->root->max_request_time * USEC;
1248                         }
1249 #endif
1250
1251                         request->when = now;
1252                         tv_add(&request->when, request->delay);
1253                         callback = wait_a_bit;
1254                         break;
1255                 }
1256
1257 #if defined(HAVE_PTHREAD_H) || defined(WITH_PROXY)
1258                 /*
1259                  *      A child thread MAY still be running on the
1260                  *      request.  Ask the thread to stop working on
1261                  *      the request.
1262                  */
1263                 if (have_children) {
1264                         /* FIXME: kill unresponsive children? */
1265
1266                         /*
1267                          *      Print this error message ONLY if
1268                          *      there's a child currently processing
1269                          *      the request.  As we don't have thread
1270                          *      locks here, there may be race
1271                          *      conditions on this check.  But it's
1272                          *      just an error message, so that's OK.
1273                          */
1274                         if (!pthread_equal(request->child_pid, NO_SUCH_CHILD_PID)) {
1275                                 radlog(L_ERR, "WARNING: Unresponsive child for request %d, in module %s component %s",
1276                                        request->number,
1277                                        request->module ? request->module : "<server core>",
1278                                        request->component ? request->component : "<server core>");
1279                         }
1280
1281                 stop_processing:
1282                         request->master_state = REQUEST_STOP_PROCESSING;
1283
1284                         request->delay = USEC / 4;
1285                         tv_add(&request->when, request->delay);
1286                         callback = wait_for_child_to_die;
1287                         break;
1288                 }
1289 #else  /* no child threads */
1290         stop_processing:
1291 #endif
1292
1293                 /*
1294                  *      Else there are no child threads.  We probably
1295                  *      should have just marked the request as 'done'
1296                  *      elsewhere, like in the post-proxy-fail
1297                  *      handler.  But doing that would involve
1298                  *      checking for max_request_time in multiple
1299                  *      places, so this may be simplest.
1300                  */
1301                 request->child_state = REQUEST_DONE;
1302                 /* FALL-THROUGH */
1303
1304                 /*
1305                  *      Mark the request as no longer running,
1306                  *      and clean it up.
1307                  */
1308         case REQUEST_DONE:
1309 #ifdef HAVE_PTHREAD_H
1310                 request->child_pid = NO_SUCH_CHILD_PID;
1311 #endif
1312
1313 #ifdef WTH_COA
1314                 /*
1315                  *      This is a CoA request.  It's been divorced
1316                  *      from everything else, so we clean it up now.
1317                  */
1318                 if (!request->in_request_hash &&
1319                     request->proxy &&
1320                     (request->packet->code != request->proxy->code) &&
1321                     ((request->proxy->code == PW_COA_REQUEST) ||
1322                      (request->proxy->code == PW_DISCONNECT_REQUEST))) {
1323                         /*
1324                          *      FIXME: Do CoA MIBs
1325                          */
1326                         ev_request_free(&request);
1327                         return;
1328                 }
1329 #endif
1330                 request_stats_final(request);
1331                 cleanup_delay(request);
1332                 return;
1333
1334         case REQUEST_REJECT_DELAY:
1335         case REQUEST_CLEANUP_DELAY:
1336 #ifdef HAVE_PTHREAD_H
1337                 request->child_pid = NO_SUCH_CHILD_PID;
1338 #endif
1339                 request_stats_final(request);
1340
1341         case REQUEST_PROXIED:
1342                 rad_assert(request->next_callback != NULL);
1343                 rad_assert(request->next_callback != wait_a_bit);
1344
1345                 request->when = request->next_when;
1346                 callback = request->next_callback;
1347                 request->next_callback = NULL;
1348                 break;
1349
1350         default:
1351                 rad_panic("Internal sanity check failure");
1352                 return;
1353         }
1354
1355         /*
1356          *      Something major went wrong.  Discard the request, and
1357          *      keep running.
1358          *
1359          *      FIXME: No idea why this happens or how to fix it...
1360          *      It seems to happen *only* when requests are proxied,
1361          *      and where the home server doesn't respond.  So it looks
1362          *      like a race condition above, but it happens in debug
1363          *      mode, with no threads...
1364          */
1365         if (!callback) {
1366                 RDEBUG("WARNING: Internal sanity check failed in event handler for request %d: Discarding the request!", request->number);
1367                 ev_request_free(&request);
1368                 return;
1369         }
1370
1371         INSERT_EVENT(callback, request);
1372 }
1373
1374 #ifdef WITH_COA
1375 static void no_response_to_coa_request(void *ctx)
1376 {
1377         REQUEST *request = ctx;
1378         char buffer[128];
1379
1380         rad_assert(request->magic == REQUEST_MAGIC);
1381         rad_assert(request->child_state == REQUEST_PROXIED);
1382         rad_assert(request->home_server != NULL);
1383         rad_assert(!request->in_request_hash);
1384
1385         radlog(L_ERR, "No response to CoA request sent to %s",
1386                inet_ntop(request->proxy->dst_ipaddr.af,
1387                          &request->proxy->dst_ipaddr.ipaddr,
1388                          buffer, sizeof(buffer)));
1389
1390         /*
1391          *      Hack.
1392          */
1393         request->packet->code |= (PW_COA_REQUEST << 8);
1394         post_proxy_fail_handler(request);
1395 }
1396
1397
1398 static int update_event_timestamp(RADIUS_PACKET *packet, time_t when)
1399 {
1400         VALUE_PAIR *vp;
1401
1402         vp = pairfind(packet->vps, PW_EVENT_TIMESTAMP);
1403         if (!vp) return 0;
1404
1405         vp->vp_date = when;
1406
1407         if (packet->data) {
1408                 free(packet->data);
1409                 packet->data = NULL;
1410                 packet->data_len = 0;
1411         }
1412
1413         return 1;               /* time stamp updated */
1414 }
1415
1416
1417 /*
1418  *      Called when we haven't received a response to a CoA request.
1419  */
1420 static void retransmit_coa_request(void *ctx)
1421 {
1422         int delay, frac;
1423         struct timeval mrd;
1424         REQUEST *request = ctx;
1425
1426         rad_assert(request->magic == REQUEST_MAGIC);
1427         rad_assert(request->child_state == REQUEST_PROXIED);
1428         rad_assert(request->home_server != NULL);
1429         rad_assert(!request->in_request_hash);
1430         rad_assert(request->parent == NULL);
1431
1432         fr_event_now(el, &now);
1433
1434         /*
1435          *      Cap count at MRC, if it is non-zero.
1436          */
1437         if (request->home_server->coa_mrc &&
1438             (request->num_coa_requests >= request->home_server->coa_mrc)) {
1439                 no_response_to_coa_request(request);
1440                 return;
1441         }
1442
1443         /*
1444          *      RFC 5080 Section 2.2.1
1445          *
1446          *      RT = 2*RTprev + RAND*RTprev
1447          *         = 1.9 * RTprev + rand(0,.2) * RTprev
1448          *         = 1.9 * RTprev + rand(0,1) * (RTprev / 5)
1449          */
1450         delay = fr_rand();
1451         delay ^= (delay >> 16);
1452         delay &= 0xffff;
1453         frac = request->delay / 5;
1454         delay = ((frac >> 16) * delay) + (((frac & 0xffff) * delay) >> 16);
1455
1456         delay += (2 * request->delay) - (request->delay / 10);
1457
1458         /*
1459          *      Cap delay at MRT, if MRT is non-zero.
1460          */
1461         if (request->home_server->coa_mrt &&
1462             (delay > (request->home_server->coa_mrt * USEC))) {
1463                 int mrt_usec = request->home_server->coa_mrt * USEC;
1464
1465                 /*
1466                  *      delay = MRT + RAND * MRT
1467                  *            = 0.9 MRT + rand(0,.2)  * MRT
1468                  */
1469                 delay = fr_rand();
1470                 delay ^= (delay >> 15);
1471                 delay &= 0x1ffff;
1472                 delay = ((mrt_usec >> 16) * delay) + (((mrt_usec & 0xffff) * delay) >> 16);
1473                 delay += mrt_usec - (mrt_usec / 10);
1474         }
1475
1476         request->delay = delay;
1477         request->when = now;
1478         tv_add(&request->when, request->delay);
1479         mrd = request->proxy_when;
1480         mrd.tv_sec += request->home_server->coa_mrd;
1481
1482         /*
1483          *      Cap duration at MRD.
1484          */
1485         if (timercmp(&mrd, &request->when, <)) {
1486                 request->when = mrd;
1487                 INSERT_EVENT(no_response_to_coa_request, request);
1488
1489         } else {
1490                 INSERT_EVENT(retransmit_coa_request, request);
1491         }
1492
1493         if (update_event_timestamp(request->proxy, now.tv_sec)) {
1494                 if (!insert_into_proxy_hash(request, TRUE)) {
1495                         DEBUG("ERROR: Failed re-inserting CoA request into proxy hash.");
1496                         return;
1497                 }
1498
1499                 request->num_proxied_requests = 0;
1500                 request->num_proxied_responses = 0;
1501         }
1502
1503         request->num_proxied_requests++;
1504         request->num_coa_requests++; /* is NOT reset by code 3 lines above! */
1505
1506         request->proxy_listener->send(request->proxy_listener,
1507                                       request);
1508 }
1509
1510
1511 /*
1512  *      The original request is either DONE, or in CLEANUP_DELAY.
1513  */
1514 static int originated_coa_request(REQUEST *request)
1515 {
1516         int delay, rcode, pre_proxy_type = 0;
1517         VALUE_PAIR *vp;
1518         REQUEST *coa;
1519         fr_ipaddr_t ipaddr;
1520         char buffer[256];
1521
1522         rad_assert(request->proxy == NULL);
1523         rad_assert(!request->in_proxy_hash);
1524         rad_assert(request->proxy_reply == NULL);
1525
1526         vp = pairfind(request->config_items, PW_SEND_COA_REQUEST);
1527         if (!vp && request->coa) vp = pairfind(request->coa->proxy->vps, PW_SEND_COA_REQUEST);
1528         if (vp) {
1529                 if (vp->vp_integer == 0) {
1530                         ev_request_free(&request->coa);
1531                         return 1;       /* success */
1532                 }
1533
1534                 if (!request->coa) request_alloc_coa(request);
1535                 if (!request->coa) return 0;
1536         }
1537
1538         coa = request->coa;
1539
1540         /*
1541          *      src_ipaddr will be set up in proxy_encode.
1542          */
1543         memset(&ipaddr, 0, sizeof(ipaddr));
1544         vp = pairfind(coa->proxy->vps, PW_PACKET_DST_IP_ADDRESS);
1545         if (vp) {
1546                 ipaddr.af = AF_INET;
1547                 ipaddr.ipaddr.ip4addr.s_addr = vp->vp_ipaddr;
1548
1549         } else if ((vp = pairfind(coa->proxy->vps,
1550                                   PW_PACKET_DST_IPV6_ADDRESS)) != NULL) {
1551                 ipaddr.af = AF_INET6;
1552                 ipaddr.ipaddr.ip6addr = vp->vp_ipv6addr;
1553
1554         } else if ((vp = pairfind(coa->proxy->vps,
1555                                   PW_HOME_SERVER_POOL)) != NULL) {
1556                 coa->home_pool = home_pool_byname(vp->vp_strvalue,
1557                                                   HOME_TYPE_COA);
1558                 if (!coa->home_pool) {
1559                         RDEBUG2("WARNING: No such home_server_pool %s",
1560                                vp->vp_strvalue);
1561         fail:
1562                         ev_request_free(&request->coa);
1563                         return 0;
1564                 }
1565
1566                 /*
1567                  *      Prefer
1568                  */
1569         } else if (request->client->coa_pool) {
1570                 coa->home_pool = request->client->coa_pool;
1571
1572         } else if (request->client->coa_server) {
1573                 coa->home_server = request->client->coa_server;
1574
1575         } else {
1576                 /*
1577                  *      If all else fails, send it to the client that
1578                  *      originated this request.
1579                  */
1580                 memcpy(&ipaddr, &request->packet->src_ipaddr, sizeof(ipaddr));
1581         }
1582
1583         /*
1584          *      Use the pool, if it exists.
1585          */
1586         if (coa->home_pool) {
1587                 coa->home_server = home_server_ldb(NULL, coa->home_pool, coa);
1588                 if (!coa->home_server) {
1589                         RDEBUG("WARNING: No live home server for home_server_pool %s", vp->vp_strvalue);
1590                         goto fail;
1591                 }
1592
1593         } else if (!coa->home_server) {
1594                 int port = PW_COA_UDP_PORT;
1595
1596                 vp = pairfind(coa->proxy->vps, PW_PACKET_DST_PORT);
1597                 if (vp) port = vp->vp_integer;
1598
1599                 coa->home_server = home_server_find(&ipaddr, port);
1600                 if (!coa->home_server) {
1601                         RDEBUG2("WARNING: Unknown destination %s:%d for CoA request.",
1602                                inet_ntop(ipaddr.af, &ipaddr.ipaddr,
1603                                          buffer, sizeof(buffer)), port);
1604                         goto fail;
1605                 }
1606         }
1607
1608         vp = pairfind(coa->proxy->vps, PW_PACKET_TYPE);
1609         if (vp) {
1610                 switch (vp->vp_integer) {
1611                 case PW_COA_REQUEST:
1612                 case PW_DISCONNECT_REQUEST:
1613                         coa->proxy->code = vp->vp_integer;
1614                         break;
1615
1616                 default:
1617                         DEBUG("Cannot set CoA Packet-Type to code %d",
1618                               vp->vp_integer);
1619                         goto fail;
1620                 }
1621         }
1622
1623         if (!coa->proxy->code) coa->proxy->code = PW_COA_REQUEST;
1624
1625         /*
1626          *      The rest of the server code assumes that
1627          *      request->packet && request->reply exist.  Copy them
1628          *      from the original request.
1629          */
1630         rad_assert(coa->packet != NULL);
1631         rad_assert(coa->packet->vps == NULL);
1632         memcpy(coa->packet, request->packet, sizeof(*request->packet));
1633         coa->packet->vps = paircopy(request->packet->vps);
1634         coa->packet->data = NULL;
1635         rad_assert(coa->reply != NULL);
1636         rad_assert(coa->reply->vps == NULL);
1637         memcpy(coa->reply, request->reply, sizeof(*request->reply));
1638         coa->reply->vps = paircopy(request->reply->vps);
1639         coa->reply->data = NULL;
1640         coa->config_items = paircopy(request->config_items);
1641
1642         /*
1643          *      Call the pre-proxy routines.
1644          */
1645         vp = pairfind(request->config_items, PW_PRE_PROXY_TYPE);
1646         if (vp) {
1647                 RDEBUG2("  Found Pre-Proxy-Type %s", vp->vp_strvalue);
1648                 pre_proxy_type = vp->vp_integer;
1649         }
1650
1651         if (coa->home_pool && coa->home_pool->virtual_server) {
1652                 const char *old_server = coa->server;
1653
1654                 coa->server = coa->home_pool->virtual_server;
1655                 RDEBUG2(" server %s {", coa->server);
1656                 rcode = module_pre_proxy(pre_proxy_type, coa);
1657                 RDEBUG2(" }");
1658                 coa->server = old_server;
1659         } else {
1660                 rcode = module_pre_proxy(pre_proxy_type, coa);
1661         }
1662         switch (rcode) {
1663         default:
1664                 goto fail;
1665
1666         /*
1667          *      Only send the CoA packet if the pre-proxy code succeeded.
1668          */
1669         case RLM_MODULE_NOOP:
1670         case RLM_MODULE_OK:
1671         case RLM_MODULE_UPDATED:
1672                 break;
1673         }
1674
1675         /*
1676          *      Source IP / port is set when the proxy socket
1677          *      is chosen.
1678          */
1679         coa->proxy->dst_ipaddr = coa->home_server->ipaddr;
1680         coa->proxy->dst_port = coa->home_server->port;
1681
1682         if (!insert_into_proxy_hash(coa, FALSE)) {
1683                 DEBUG("ERROR: Failed inserting CoA request into proxy hash.");
1684                 goto fail;
1685         }
1686
1687         /*
1688          *      We CANNOT divorce the CoA request from the parent
1689          *      request.  This function is running in a child thread,
1690          *      and we need access to the main event loop in order to
1691          *      to add the timers for the CoA packet.  See
1692          *      wait_a_bit().
1693          */
1694
1695         /*
1696          *      Forget about the original request completely at this
1697          *      point.
1698          */
1699         request = coa;
1700
1701         gettimeofday(&request->proxy_when, NULL);
1702         request->received = request->next_when = request->proxy_when;
1703         rad_assert(request->proxy_reply == NULL);
1704
1705         /*
1706          *      Implement re-transmit algorithm as per RFC 5080
1707          *      Section 2.2.1.
1708          *
1709          *      We want IRT + RAND*IRT
1710          *      or 0.9 IRT + rand(0,.2) IRT
1711          *
1712          *      2^20 ~ USEC, and we want 2.
1713          *      rand(0,0.2) USEC ~ (rand(0,2^21) / 10)
1714          */
1715         delay = (fr_rand() & ((1 << 22) - 1)) / 10;
1716         request->delay = delay * request->home_server->coa_irt;
1717         delay = request->home_server->coa_irt * USEC;
1718         delay -= delay / 10;
1719         delay += request->delay;
1720
1721         request->delay = delay;
1722         tv_add(&request->next_when, delay);
1723         request->next_callback = retransmit_coa_request;
1724
1725         /*
1726          *      Note that we set proxied BEFORE sending the packet.
1727          *
1728          *      Once we send it, the request is tainted, as
1729          *      another thread may have picked it up.  Don't
1730          *      touch it!
1731          */
1732         request->num_proxied_requests = 1;
1733         request->num_proxied_responses = 0;
1734         request->child_pid = NO_SUCH_CHILD_PID;
1735
1736         update_event_timestamp(request->proxy, request->proxy_when.tv_sec);
1737
1738         request->child_state = REQUEST_PROXIED;
1739
1740         DEBUG_PACKET(request, request->proxy, 1);
1741
1742         request->proxy_listener->send(request->proxy_listener,
1743                                       request);
1744         return 1;
1745 }
1746 #endif  /* WITH_COA */
1747
1748 #ifdef WITH_PROXY
1749 static int process_proxy_reply(REQUEST *request)
1750 {
1751         int rcode;
1752         int post_proxy_type = 0;
1753         VALUE_PAIR *vp;
1754
1755         /*
1756          *      Delete any reply we had accumulated until now.
1757          */
1758         pairfree(&request->reply->vps);
1759
1760         /*
1761          *      Run the packet through the post-proxy stage,
1762          *      BEFORE playing games with the attributes.
1763          */
1764         vp = pairfind(request->config_items, PW_POST_PROXY_TYPE);
1765         if (vp) {
1766                 RDEBUG2("  Found Post-Proxy-Type %s", vp->vp_strvalue);
1767                 post_proxy_type = vp->vp_integer;
1768         }
1769
1770         if (request->home_pool && request->home_pool->virtual_server) {
1771                 const char *old_server = request->server;
1772
1773                 request->server = request->home_pool->virtual_server;
1774                 RDEBUG2(" server %s {", request->server);
1775                 rcode = module_post_proxy(post_proxy_type, request);
1776                 RDEBUG2(" }");
1777                 request->server = old_server;
1778         } else {
1779                 rcode = module_post_proxy(post_proxy_type, request);
1780         }
1781
1782 #ifdef WITH_COA
1783         if (request->packet->code == request->proxy->code)
1784           /*
1785            *    Don't run the next bit if we originated a CoA
1786            *    packet, after receiving an Access-Request or
1787            *    Accounting-Request.
1788            */
1789 #endif
1790
1791         /*
1792          *      There may NOT be a proxy reply, as we may be
1793          *      running Post-Proxy-Type = Fail.
1794          */
1795         if (request->proxy_reply) {
1796                 /*
1797                  *      Delete the Proxy-State Attributes from
1798                  *      the reply.  These include Proxy-State
1799                  *      attributes from us and remote server.
1800                  */
1801                 pairdelete(&request->proxy_reply->vps, PW_PROXY_STATE);
1802
1803                 /*
1804                  *      Add the attributes left in the proxy
1805                  *      reply to the reply list.
1806                  */
1807                 pairadd(&request->reply->vps, request->proxy_reply->vps);
1808                 request->proxy_reply->vps = NULL;
1809
1810                 /*
1811                  *      Free proxy request pairs.
1812                  */
1813                 pairfree(&request->proxy->vps);
1814         }
1815
1816         switch (rcode) {
1817         default:  /* Don't do anything */
1818                 break;
1819         case RLM_MODULE_FAIL:
1820                 /* FIXME: debug print stuff */
1821                 request->child_state = REQUEST_DONE;
1822                 return 0;
1823
1824         case RLM_MODULE_HANDLED:
1825                 /* FIXME: debug print stuff */
1826                 request->child_state = REQUEST_DONE;
1827                 return 0;
1828         }
1829
1830         return 1;
1831 }
1832 #endif
1833
1834 static int request_pre_handler(REQUEST *request)
1835 {
1836         int rcode;
1837
1838         rad_assert(request->magic == REQUEST_MAGIC);
1839         rad_assert(request->packet != NULL);
1840
1841         request->child_state = REQUEST_RUNNING;
1842
1843         /*
1844          *      Don't decode the packet if it's an internal "fake"
1845          *      request.  Instead, just return so that the caller can
1846          *      process it.
1847          */
1848         if (request->packet->dst_port == 0) {
1849                 request->username = pairfind(request->packet->vps,
1850                                              PW_USER_NAME);
1851                 request->password = pairfind(request->packet->vps,
1852                                              PW_USER_PASSWORD);
1853                 return 1;
1854         }
1855
1856 #ifdef WITH_PROXY
1857         /*
1858          *      Put the decoded packet into it's proper place.
1859          */
1860         if (request->proxy_reply != NULL) {
1861                 /*
1862                  *      FIXME: For now, we can only proxy RADIUS packets.
1863                  *
1864                  *      In order to proxy other packets, we need to
1865                  *      somehow cache the "decode" function.
1866                  */
1867                 rcode = rad_decode(request->proxy_reply, request->proxy,
1868                                    request->home_server->secret);
1869                 DEBUG_PACKET(request, request->proxy_reply, 0);
1870         } else
1871 #endif
1872         if (request->packet->vps == NULL) {
1873                 rcode = request->listener->decode(request->listener, request);
1874
1875                 if (debug_condition) {
1876                         int result = FALSE;
1877                         const char *my_debug = debug_condition;
1878
1879                         /*
1880                          *      Ignore parse errors.
1881                          */
1882                         radius_evaluate_condition(request, RLM_MODULE_OK, 0,
1883                                                   &my_debug, 1,
1884                                                   &result);
1885                         if (result) {
1886                                 request->options = 2;
1887                                 request->radlog = radlog_request;
1888                         }
1889                 }
1890
1891                 DEBUG_PACKET(request, request->packet, 0);
1892         } else {
1893                 rcode = 0;
1894         }
1895
1896         if (rcode < 0) {
1897                 radlog(L_ERR, "%s Dropping packet without response.", fr_strerror());
1898                 request->child_state = REQUEST_DONE;
1899                 return 0;
1900         }
1901
1902         if (!request->username) {
1903                 request->username = pairfind(request->packet->vps,
1904                                              PW_USER_NAME);
1905         }
1906
1907 #ifdef WITH_PROXY
1908         if (request->proxy) {
1909                 return process_proxy_reply(request);
1910 #endif
1911         }
1912
1913         return 1;
1914 }
1915
1916
1917 #ifdef WITH_PROXY
1918 /*
1919  *      Do state handling when we proxy a request.
1920  */
1921 static int proxy_request(REQUEST *request)
1922 {
1923         struct timeval when;
1924         char buffer[128];
1925
1926         if (request->home_server->server) {
1927                 RDEBUG("ERROR: Cannot perform real proxying to a virtual server.");
1928                 return 0;
1929         }
1930
1931         if (!insert_into_proxy_hash(request, FALSE)) {
1932                 RDEBUG("ERROR: Failed inserting request into proxy hash.");
1933                 return 0;
1934         }
1935
1936         request->proxy_listener->encode(request->proxy_listener, request);
1937
1938         when = request->received;
1939         when.tv_sec += request->root->max_request_time;
1940
1941         gettimeofday(&request->proxy_when, NULL);
1942
1943         request->next_when = request->proxy_when;
1944         request->next_when.tv_sec += request->home_server->response_window;
1945
1946         rad_assert(request->home_server->response_window > 0);
1947
1948         if (timercmp(&when, &request->next_when, <)) {
1949                 request->next_when = when;
1950         }
1951         request->next_callback = no_response_to_proxied_request;
1952
1953         RDEBUG2("Proxying request %d to home server %s port %d",
1954                request->number,
1955                inet_ntop(request->proxy->dst_ipaddr.af,
1956                          &request->proxy->dst_ipaddr.ipaddr,
1957                          buffer, sizeof(buffer)),
1958                 request->proxy->dst_port);
1959
1960         /*
1961          *      Note that we set proxied BEFORE sending the packet.
1962          *
1963          *      Once we send it, the request is tainted, as
1964          *      another thread may have picked it up.  Don't
1965          *      touch it!
1966          */
1967         request->num_proxied_requests = 1;
1968         request->num_proxied_responses = 0;
1969 #ifdef HAVE_PTHREAD_H
1970         request->child_pid = NO_SUCH_CHILD_PID;
1971 #endif
1972         request->child_state = REQUEST_PROXIED;
1973
1974         DEBUG_PACKET(request, request->proxy, 1);
1975
1976         request->proxy_listener->send(request->proxy_listener,
1977                                       request);
1978         return 1;
1979 }
1980
1981
1982 /*
1983  *      "Proxy" the request by sending it to a new virtual server.
1984  */
1985 static int proxy_to_virtual_server(REQUEST *request)
1986 {
1987         REQUEST *fake;
1988         RAD_REQUEST_FUNP fun;
1989
1990         if (!request->home_server || !request->home_server->server) return 0;
1991
1992         if (request->parent) {
1993                 RDEBUG2("WARNING: Cancelling proxy request to virtual server %s as this request was itself proxied.", request->home_server->server);
1994                 return 0;
1995         }
1996
1997         fake = request_alloc_fake(request);
1998         if (!fake) {
1999                 RDEBUG2("WARNING: Out of memory");
2000                 return 0;
2001         }
2002
2003         fake->packet->vps = paircopy(request->proxy->vps);
2004         fake->server = request->home_server->server;
2005
2006         if (request->proxy->code == PW_AUTHENTICATION_REQUEST) {
2007                 fun = rad_authenticate;
2008
2009 #ifdef WITH_ACCOUNTING
2010         } else if (request->proxy->code == PW_ACCOUNTING_REQUEST) {
2011                 fun = rad_accounting;
2012 #endif
2013
2014         } else {
2015                 RDEBUG2("Unknown packet type %d", request->proxy->code);
2016                 ev_request_free(&fake);
2017                 return 0;
2018         }
2019
2020         RDEBUG2(">>> Sending proxied request internally to virtual server.");
2021         radius_handle_request(fake, fun);
2022         RDEBUG2("<<< Received proxied response code %d from internal virtual server.", fake->reply->code);
2023
2024         if (fake->reply->code != 0) {
2025                 request->proxy_reply = fake->reply;
2026                 fake->reply = NULL;
2027         } else {
2028                 /*
2029                  *      There was no response
2030                  */
2031                 setup_post_proxy_fail(request);
2032         }
2033
2034         ev_request_free(&fake);
2035
2036         process_proxy_reply(request);
2037
2038         /*
2039          *      Process it through the normal section again, but ONLY
2040          *      if we received a proxy reply..
2041          */
2042         if (request->proxy_reply) {
2043                 if (request->server) RDEBUG("server %s {",
2044                                             request->server != NULL ?
2045                                             request->server : "");
2046                 fun(request);
2047
2048                 if (request->server) RDEBUG("} # server %s",
2049                                             request->server != NULL ?
2050                                             request->server : "");
2051         }
2052
2053         return 2;               /* success, but NOT '1' !*/
2054 }
2055
2056 /*
2057  *      Return 1 if we did proxy it, or the proxy attempt failed
2058  *      completely.  Either way, the caller doesn't touch the request
2059  *      any more if we return 1.
2060  */
2061 static int successfully_proxied_request(REQUEST *request)
2062 {
2063         int rcode;
2064         int pre_proxy_type = 0;
2065         VALUE_PAIR *realmpair;
2066         VALUE_PAIR *strippedname;
2067         VALUE_PAIR *vp;
2068         char *realmname = NULL;
2069         home_server *home;
2070         REALM *realm = NULL;
2071         home_pool_t *pool;
2072
2073         /*
2074          *      If it was already proxied, do nothing.
2075          *
2076          *      FIXME: This should really be a serious error.
2077          */
2078         if (request->in_proxy_hash ||
2079             (request->proxy_reply && (request->proxy_reply->code != 0))) {
2080                 return 0;
2081         }
2082
2083         realmpair = pairfind(request->config_items, PW_PROXY_TO_REALM);
2084         if (!realmpair || (realmpair->length == 0)) {
2085                 int pool_type;
2086
2087                 vp = pairfind(request->config_items, PW_HOME_SERVER_POOL);
2088                 if (!vp) return 0;
2089
2090                 switch (request->packet->code) {
2091                 case PW_AUTHENTICATION_REQUEST:
2092                         pool_type = HOME_TYPE_AUTH;
2093                         break;
2094
2095 #ifdef WITH_ACCOUNTING
2096                 case PW_ACCOUNTING_REQUEST:
2097                         pool_type = HOME_TYPE_ACCT;
2098                         break;
2099 #endif
2100
2101 #ifdef WITH_COA
2102                 case PW_COA_REQUEST:
2103                 case PW_DISCONNECT_REQUEST:
2104                         pool_type = HOME_TYPE_COA;
2105                         break;
2106 #endif
2107
2108                 default:
2109                         return 0;
2110                 }
2111
2112                 pool = home_pool_byname(vp->vp_strvalue, pool_type);
2113                 if (!pool) {
2114                         RDEBUG2("ERROR: Cannot proxy to unknown pool %s",
2115                                 vp->vp_strvalue);
2116                         return 0;
2117                 }
2118
2119                 realmname = NULL; /* no realms */
2120                 realm = NULL;
2121                 goto found_pool;
2122         }
2123
2124         realmname = (char *) realmpair->vp_strvalue;
2125
2126         realm = realm_find2(realmname);
2127         if (!realm) {
2128                 RDEBUG2("ERROR: Cannot proxy to unknown realm %s", realmname);
2129                 return 0;
2130         }
2131
2132         /*
2133          *      Figure out which pool to use.
2134          */
2135         if (request->packet->code == PW_AUTHENTICATION_REQUEST) {
2136                 pool = realm->auth_pool;
2137
2138 #ifdef WITH_ACCOUNTING
2139         } else if (request->packet->code == PW_ACCOUNTING_REQUEST) {
2140                 pool = realm->acct_pool;
2141 #endif
2142
2143 #ifdef WITH_COA
2144         } else if ((request->packet->code == PW_COA_REQUEST) ||
2145                    (request->packet->code == PW_DISCONNECT_REQUEST)) {
2146                 pool = realm->acct_pool;
2147 #endif
2148
2149         } else {
2150                 rad_panic("Internal sanity check failed");
2151         }
2152
2153         if (!pool) {
2154                 RDEBUG2(" WARNING: Cancelling proxy to Realm %s, as the realm is local.",
2155                        realmname);
2156                 return 0;
2157         }
2158
2159 found_pool:
2160         home = home_server_ldb(realmname, pool, request);
2161         if (!home) {
2162                 RDEBUG2("ERROR: Failed to find live home server for realm %s",
2163                        realmname);
2164                 return -1;
2165         }
2166         request->home_pool = pool;
2167
2168 #ifdef WITH_COA
2169         /*
2170          *      Once we've decided to proxy a request, we cannot send
2171          *      a CoA packet.  So we free up any CoA packet here.
2172          */
2173         ev_request_free(&request->coa);
2174 #endif
2175         /*
2176          *      Remember that we sent the request to a Realm.
2177          */
2178         if (realmname) pairadd(&request->packet->vps,
2179                                pairmake("Realm", realmname, T_OP_EQ));
2180
2181         /*
2182          *      Strip the name, if told to.
2183          *
2184          *      Doing it here catches the case of proxied tunneled
2185          *      requests.
2186          */
2187         if (realm && (realm->striprealm == TRUE) &&
2188            (strippedname = pairfind(request->proxy->vps, PW_STRIPPED_USER_NAME)) != NULL) {
2189                 /*
2190                  *      If there's a Stripped-User-Name attribute in
2191                  *      the request, then use THAT as the User-Name
2192                  *      for the proxied request, instead of the
2193                  *      original name.
2194                  *
2195                  *      This is done by making a copy of the
2196                  *      Stripped-User-Name attribute, turning it into
2197                  *      a User-Name attribute, deleting the
2198                  *      Stripped-User-Name and User-Name attributes
2199                  *      from the vps list, and making the new
2200                  *      User-Name the head of the vps list.
2201                  */
2202                 vp = pairfind(request->proxy->vps, PW_USER_NAME);
2203                 if (!vp) {
2204                         vp = radius_paircreate(request, NULL,
2205                                                PW_USER_NAME, PW_TYPE_STRING);
2206                         rad_assert(vp != NULL); /* handled by above function */
2207                         /* Insert at the START of the list */
2208                         vp->next = request->proxy->vps;
2209                         request->proxy->vps = vp;
2210                 }
2211                 memcpy(vp->vp_strvalue, strippedname->vp_strvalue,
2212                        sizeof(vp->vp_strvalue));
2213                 vp->length = strippedname->length;
2214
2215                 /*
2216                  *      Do NOT delete Stripped-User-Name.
2217                  */
2218         }
2219
2220         /*
2221          *      If there is no PW_CHAP_CHALLENGE attribute but
2222          *      there is a PW_CHAP_PASSWORD we need to add it
2223          *      since we can't use the request authenticator
2224          *      anymore - we changed it.
2225          */
2226         if ((request->packet->code == PW_AUTHENTICATION_REQUEST) &&
2227             pairfind(request->proxy->vps, PW_CHAP_PASSWORD) &&
2228             pairfind(request->proxy->vps, PW_CHAP_CHALLENGE) == NULL) {
2229                 vp = radius_paircreate(request, &request->proxy->vps,
2230                                        PW_CHAP_CHALLENGE, PW_TYPE_OCTETS);
2231                 vp->length = AUTH_VECTOR_LEN;
2232                 memcpy(vp->vp_strvalue, request->packet->vector, AUTH_VECTOR_LEN);
2233         }
2234
2235         /*
2236          *      The RFC's say we have to do this, but FreeRADIUS
2237          *      doesn't need it.
2238          */
2239         vp = radius_paircreate(request, &request->proxy->vps,
2240                                PW_PROXY_STATE, PW_TYPE_OCTETS);
2241         snprintf(vp->vp_strvalue, sizeof(vp->vp_strvalue), "%d",
2242                  request->packet->id);
2243         vp->length = strlen(vp->vp_strvalue);
2244
2245         /*
2246          *      Should be done BEFORE inserting into proxy hash, as
2247          *      pre-proxy may use this information, or change it.
2248          */
2249         request->proxy->code = request->packet->code;
2250
2251         /*
2252          *      Call the pre-proxy routines.
2253          */
2254         vp = pairfind(request->config_items, PW_PRE_PROXY_TYPE);
2255         if (vp) {
2256                 RDEBUG2("  Found Pre-Proxy-Type %s", vp->vp_strvalue);
2257                 pre_proxy_type = vp->vp_integer;
2258         }
2259
2260         rad_assert(request->home_pool != NULL);
2261
2262         if (request->home_pool->virtual_server) {
2263                 const char *old_server = request->server;
2264
2265                 request->server = request->home_pool->virtual_server;
2266                 RDEBUG2(" server %s {", request->server);
2267                 rcode = module_pre_proxy(pre_proxy_type, request);
2268                 RDEBUG2(" }");
2269                         request->server = old_server;
2270         } else {
2271                 rcode = module_pre_proxy(pre_proxy_type, request);
2272         }
2273         switch (rcode) {
2274         case RLM_MODULE_FAIL:
2275         case RLM_MODULE_INVALID:
2276         case RLM_MODULE_NOTFOUND:
2277         case RLM_MODULE_USERLOCK:
2278         default:
2279                 /* FIXME: debug print failed stuff */
2280                 return -1;
2281
2282         case RLM_MODULE_REJECT:
2283         case RLM_MODULE_HANDLED:
2284                 return 0;
2285
2286         /*
2287          *      Only proxy the packet if the pre-proxy code succeeded.
2288          */
2289         case RLM_MODULE_NOOP:
2290         case RLM_MODULE_OK:
2291         case RLM_MODULE_UPDATED:
2292                 break;
2293         }
2294
2295         /*
2296          *      If it's a fake request, don't send the proxy
2297          *      packet.  The outer tunnel session will take
2298          *      care of doing that.
2299          */
2300         if (request->packet->dst_port == 0) {
2301                 request->home_server = NULL;
2302                 return 1;
2303         }
2304
2305         if (request->home_server->server) {
2306                 return proxy_to_virtual_server(request);
2307         }
2308
2309         if (!proxy_request(request)) {
2310                 RDEBUG("ERROR: Failed to proxy request %d", request->number);
2311                 return -1;
2312         }
2313
2314         return 1;
2315 }
2316 #endif
2317
2318 static void request_post_handler(REQUEST *request)
2319 {
2320         int child_state = -1;
2321         struct timeval when;
2322         VALUE_PAIR *vp;
2323
2324         if ((request->master_state == REQUEST_STOP_PROCESSING) ||
2325             (request->parent &&
2326              (request->parent->master_state == REQUEST_STOP_PROCESSING))) {
2327                 RDEBUG2("Request %d was cancelled.", request->number);
2328 #ifdef HAVE_PTHREAD_H
2329                 request->child_pid = NO_SUCH_CHILD_PID;
2330 #endif
2331                 child_state = REQUEST_DONE;
2332                 goto cleanup;
2333         }
2334
2335         if (request->child_state != REQUEST_RUNNING) {
2336                 rad_panic("Internal sanity check failed");
2337         }
2338
2339 #ifdef WITH_COA
2340         /*
2341          *      If it's not in the request hash, it's a CoA request.
2342          *      We hope.
2343          */
2344         if (!request->in_request_hash &&
2345             request->proxy &&
2346             ((request->proxy->code == PW_COA_REQUEST) ||
2347              (request->proxy->code == PW_DISCONNECT_REQUEST))) {
2348                 request->next_callback = NULL;
2349                 child_state = REQUEST_DONE;
2350                 goto cleanup;
2351         }
2352 #endif
2353
2354         /*
2355          *      Catch Auth-Type := Reject BEFORE proxying the packet.
2356          */
2357         if ((request->packet->code == PW_AUTHENTICATION_REQUEST) &&
2358             (request->reply->code == 0) &&
2359             ((vp = pairfind(request->config_items, PW_AUTH_TYPE)) != NULL) &&
2360             (vp->vp_integer == PW_AUTHTYPE_REJECT)) {
2361                 request->reply->code = PW_AUTHENTICATION_REJECT;
2362         }
2363
2364 #ifdef WITH_PROXY
2365         if (request->root->proxy_requests &&
2366             !request->in_proxy_hash &&
2367             (request->reply->code == 0) &&
2368             (request->packet->dst_port != 0) &&
2369             (request->packet->code != PW_STATUS_SERVER)) {
2370                 int rcode = successfully_proxied_request(request);
2371
2372                 if (rcode == 1) return; /* request is invalid */
2373
2374                 /*
2375                  *      Failed proxying it (dead home servers, etc.)
2376                  *      Run it through Post-Proxy-Type = Fail, and
2377                  *      respond to the request.
2378                  *
2379                  *      Note that we're in a child thread here, so we
2380                  *      do NOT re-schedule the request.  Instead, we
2381                  *      do what we would have done, which is run the
2382                  *      pre-handler, a NULL request handler, and then
2383                  *      the post handler.
2384                  */
2385                 if ((rcode < 0) && setup_post_proxy_fail(request)) {
2386                         request_pre_handler(request);
2387                 }
2388
2389                 /*
2390                  *      Else we weren't supposed to proxy it,
2391                  *      OR we proxied it internally to a virutal server.
2392                  */
2393         }
2394 #endif
2395
2396         /*
2397          *      Fake requests don't get encoded or signed.  The caller
2398          *      also requires the reply VP's, so we don't free them
2399          *      here!
2400          */
2401         if (request->packet->dst_port == 0) {
2402                 /* FIXME: RDEBUG going to the next request */
2403 #ifdef HAVE_PTHREAD_H
2404                 request->child_pid = NO_SUCH_CHILD_PID;
2405 #endif
2406                 request->child_state = REQUEST_DONE;
2407                 return;
2408         }
2409
2410 #ifdef WITH_PROXY
2411         /*
2412          *      Copy Proxy-State from the request to the reply.
2413          */
2414         vp = paircopy2(request->packet->vps, PW_PROXY_STATE);
2415         if (vp) pairadd(&request->reply->vps, vp);
2416 #endif
2417
2418         /*
2419          *      Access-Requests get delayed or cached.
2420          */
2421         switch (request->packet->code) {
2422         case PW_AUTHENTICATION_REQUEST:
2423                 gettimeofday(&request->next_when, NULL);
2424
2425                 if (request->reply->code == 0) {
2426                         /*
2427                          *      Check if the lack of response is intentional.
2428                          */
2429                         vp = pairfind(request->config_items,
2430                                       PW_RESPONSE_PACKET_TYPE);
2431                         if (!vp) {
2432                                 RDEBUG2("There was no response configured: rejecting request %d",
2433                                        request->number);
2434                                 request->reply->code = PW_AUTHENTICATION_REJECT;
2435
2436                         } else if (vp->vp_integer == 256) {
2437                                 RDEBUG2("Not responding to request %d",
2438                                        request->number);
2439
2440                                 /*
2441                                  *      Force cleanup after a long
2442                                  *      time, so that we don't
2443                                  *      re-process the packet.
2444                                  */
2445                                 request->next_when.tv_sec += request->root->max_request_time;
2446                                 request->next_callback = cleanup_delay;
2447                                 child_state = REQUEST_CLEANUP_DELAY;
2448                                 break;
2449                         } else {
2450                                 request->reply->code = vp->vp_integer;
2451
2452                         }
2453                 }
2454
2455                 /*
2456                  *      Run rejected packets through
2457                  *
2458                  *      Post-Auth-Type = Reject
2459                  */
2460                 if (request->reply->code == PW_AUTHENTICATION_REJECT) {
2461                         pairdelete(&request->config_items, PW_POST_AUTH_TYPE);
2462                         vp = radius_pairmake(request, &request->config_items,
2463                                              "Post-Auth-Type", "Reject",
2464                                              T_OP_SET);
2465                         if (vp) rad_postauth(request);
2466
2467                         /*
2468                          *      If configured, delay Access-Reject packets.
2469                          *
2470                          *      If request->root->reject_delay = 0, we discover
2471                          *      that we have to send the packet now.
2472                          */
2473                         when = request->received;
2474                         when.tv_sec += request->root->reject_delay;
2475
2476                         if (timercmp(&when, &request->next_when, >)) {
2477                                 RDEBUG2("Delaying reject of request %d for %d seconds",
2478                                        request->number,
2479                                        request->root->reject_delay);
2480                                 request->next_when = when;
2481                                 request->next_callback = reject_delay;
2482 #ifdef HAVE_PTHREAD_H
2483                                 request->child_pid = NO_SUCH_CHILD_PID;
2484 #endif
2485                                 request->child_state = REQUEST_REJECT_DELAY;
2486                                 return;
2487                         }
2488                 }
2489
2490 #ifdef WITH_COA
2491         case PW_COA_REQUEST:
2492         case PW_DISCONNECT_REQUEST:
2493 #endif
2494                 request->next_when.tv_sec += request->root->cleanup_delay;
2495                 request->next_callback = cleanup_delay;
2496                 child_state = REQUEST_CLEANUP_DELAY;
2497                 break;
2498
2499         case PW_ACCOUNTING_REQUEST:
2500                 request->next_callback = NULL; /* just to be safe */
2501                 child_state = REQUEST_DONE;
2502                 break;
2503
2504                 /*
2505                  *      FIXME: Status-Server should probably not be
2506                  *      handled here...
2507                  */
2508         case PW_STATUS_SERVER:
2509                 request->next_callback = NULL;
2510                 child_state = REQUEST_DONE;
2511                 break;
2512
2513         default:
2514                 /*
2515                  *      DHCP, VMPS, etc.
2516                  */
2517                 request->next_callback = NULL;
2518                 child_state = REQUEST_DONE;
2519                 break;
2520         }
2521
2522         /*
2523          *      Suppress "no reply" packets here, unless we're reading
2524          *      from the "detail" file.  In that case, we've got to
2525          *      tell the detail file handler that the request is dead,
2526          *      and it should re-send it.
2527          *      If configured, encode, sign, and send.
2528          */
2529         if ((request->reply->code != 0) ||
2530             (request->listener->type == RAD_LISTEN_DETAIL)) {
2531                 DEBUG_PACKET(request, request->reply, 1);
2532                 request->listener->send(request->listener, request);
2533         }
2534
2535 #ifdef WITH_COA
2536         /*
2537          *      Now that we've completely processed the request,
2538          *      see if we need to originate a CoA request.
2539          */
2540         if (request->coa ||
2541             (pairfind(request->config_items, PW_SEND_COA_REQUEST) != NULL)) {
2542                 if (!originated_coa_request(request)) {
2543                         RDEBUG2("Do CoA Fail handler here");
2544                 }
2545                 /* request->coa is stil set, so we can update events */
2546         }
2547 #endif
2548
2549  cleanup:
2550         /*
2551          *      Clean up.  These are no longer needed.
2552          */
2553         pairfree(&request->config_items);
2554
2555         pairfree(&request->packet->vps);
2556         request->username = NULL;
2557         request->password = NULL;
2558
2559         pairfree(&request->reply->vps);
2560
2561 #ifdef WITH_PROXY
2562         if (request->proxy) {
2563                 pairfree(&request->proxy->vps);
2564
2565                 if (request->proxy_reply) {
2566                         pairfree(&request->proxy_reply->vps);
2567                 }
2568
2569 #if 0
2570                 /*
2571                  *      We're not tracking responses from the home
2572                  *      server, we can therefore free this memory in
2573                  *      the child thread.
2574                  */
2575                 if (!request->in_proxy_hash) {
2576                         rad_free(&request->proxy);
2577                         rad_free(&request->proxy_reply);
2578                         request->home_server = NULL;
2579                 }
2580 #endif
2581         }
2582 #endif
2583
2584         RDEBUG2("Finished request %d.", request->number);
2585         rad_assert(child_state >= 0);
2586         request->child_state = child_state;
2587
2588         /*
2589          *      Single threaded mode: update timers now.
2590          */
2591         if (!have_children) wait_a_bit(request);
2592 }
2593
2594
2595 static void received_retransmit(REQUEST *request, const RADCLIENT *client)
2596 {
2597 #ifdef WITH_PROXY
2598         char buffer[128];
2599 #endif
2600
2601         RAD_STATS_TYPE_INC(request->listener, total_dup_requests);
2602         RAD_STATS_CLIENT_INC(request->listener, client, total_dup_requests);
2603
2604         switch (request->child_state) {
2605         case REQUEST_QUEUED:
2606         case REQUEST_RUNNING:
2607 #ifdef WITH_PROXY
2608         discard:
2609 #endif
2610                 radlog(L_ERR, "Discarding duplicate request from "
2611                        "client %s port %d - ID: %d due to unfinished request %d",
2612                        client->shortname,
2613                        request->packet->src_port,request->packet->id,
2614                        request->number);
2615                 break;
2616
2617 #ifdef WITH_PROXY
2618         case REQUEST_PROXIED:
2619                 /*
2620                  *      We're not supposed to have duplicate
2621                  *      accounting packets.  The other states handle
2622                  *      duplicates fine (discard, or send duplicate
2623                  *      reply).  But we do NOT want to retransmit an
2624                  *      accounting request here, because that would
2625                  *      involve updating the Acct-Delay-Time, and
2626                  *      therefore changing the packet Id, etc.
2627                  *
2628                  *      Instead, we just discard the packet.  We may
2629                  *      eventually respond, or the client will send a
2630                  *      new accounting packet.
2631                  *
2632                  *      The same comments go for Status-Server, and
2633                  *      other packet types.
2634                  *
2635                  *      FIXME: coa: when we proxy CoA && Disconnect
2636                  *      packets, this logic has to be fixed.
2637                  */
2638                 if (request->packet->code != PW_AUTHENTICATION_REQUEST) {
2639                         goto discard;
2640                 }
2641
2642                 check_for_zombie_home_server(request);
2643
2644                 /*
2645                  *      If we've just discovered that the home server
2646                  *      is dead, OR the socket has been closed, look for
2647                  *      another connection to a home server.
2648                  */
2649                 if (((request->packet->dst_port != 0) &&
2650                      (request->home_server->state == HOME_STATE_IS_DEAD)) ||
2651                     (request->proxy_listener->status != RAD_LISTEN_STATUS_KNOWN)) {
2652                         home_server *home;
2653
2654                         remove_from_proxy_hash(request);
2655
2656                         home = home_server_ldb(NULL, request->home_pool, request);
2657                         if (!home) {
2658                                 RDEBUG2("Failed to find live home server for request %d", request->number);
2659                         no_home_servers:
2660                                 /*
2661                                  *      Do post-request processing,
2662                                  *      and any insertion of necessary
2663                                  *      events.
2664                                  */
2665                                 post_proxy_fail_handler(request);
2666                                 return;
2667                         }
2668
2669                         request->proxy->code = request->packet->code;
2670
2671                         /*
2672                          *      Free the old packet, to force re-encoding
2673                          */
2674                         free(request->proxy->data);
2675                         request->proxy->data = NULL;
2676                         request->proxy->data_len = 0;
2677
2678                         /*
2679                          *      This request failed over to a virtual
2680                          *      server.  Push it back onto the queue
2681                          *      to be processed.
2682                          */
2683                         if (request->home_server->server) {
2684                                 proxy_fallback_handler(request);
2685                                 return;
2686                         }
2687
2688                         /*
2689                          *      Try to proxy the request.
2690                          */
2691                         if (!proxy_request(request)) {
2692                                 RDEBUG("ERROR: Failed to re-proxy request %d", request->number);
2693                                 goto no_home_servers;
2694                         }
2695
2696                         /*
2697                          *      This code executes in the main server
2698                          *      thread, so there's no need for locking.
2699                          */
2700                         rad_assert(request->next_callback != NULL);
2701                         INSERT_EVENT(request->next_callback, request);
2702                         request->next_callback = NULL;
2703                         return;
2704                 } /* else the home server is still alive */
2705
2706 #ifdef WITH_TCP
2707                 if (request->home_server->proto == IPPROTO_TCP) {
2708                         DEBUG2("Suppressing duplicate proxied request to home server %s port %d proto TCP - ID: %d",
2709                                inet_ntop(request->proxy->dst_ipaddr.af,
2710                                          &request->proxy->dst_ipaddr.ipaddr,
2711                                          buffer, sizeof(buffer)),
2712                                request->proxy->dst_port,
2713                                request->proxy->id);
2714                         break;
2715                 }
2716 #endif
2717
2718                 RDEBUG2("Sending duplicate proxied request to home server %s port %d - ID: %d",
2719                        inet_ntop(request->proxy->dst_ipaddr.af,
2720                                  &request->proxy->dst_ipaddr.ipaddr,
2721                                  buffer, sizeof(buffer)),
2722                        request->proxy->dst_port,
2723                        request->proxy->id);
2724                 request->num_proxied_requests++;
2725
2726                 DEBUG_PACKET(request, request->proxy, 1);
2727                 request->proxy_listener->send(request->proxy_listener,
2728                                               request);
2729                 break;
2730 #endif
2731
2732         case REQUEST_REJECT_DELAY:
2733                 RDEBUG2("Waiting to send Access-Reject "
2734                        "to client %s port %d - ID: %d",
2735                        client->shortname,
2736                        request->packet->src_port, request->packet->id);
2737                 break;
2738
2739         case REQUEST_CLEANUP_DELAY:
2740         case REQUEST_DONE:
2741                 if (request->reply->code == 0) {
2742                         RDEBUG2("Ignoring retransmit from client %s port %d "
2743                                 "- ID: %d, no reply was configured",
2744                                 client->shortname,
2745                                 request->packet->src_port, request->packet->id);
2746                         return;
2747                 }
2748
2749                 /*
2750                  *      FIXME: This sends duplicate replies to
2751                  *      accounting requests, even if Acct-Delay-Time
2752                  *      or Event-Timestamp is in the packet.  In those
2753                  *      cases, the Id should be changed, and the packet
2754                  *      re-calculated.
2755                  */
2756                 RDEBUG2("Sending duplicate reply "
2757                        "to client %s port %d - ID: %d",
2758                        client->shortname,
2759                        request->packet->src_port, request->packet->id);
2760                 DEBUG_PACKET(request, request->reply, 1);
2761                 request->listener->send(request->listener, request);
2762                 break;
2763         }
2764 }
2765
2766
2767 static void received_conflicting_request(REQUEST *request,
2768                                          const RADCLIENT *client)
2769 {
2770         radlog(L_ERR, "Received conflicting packet from "
2771                "client %s port %d - ID: %d due to unfinished request %d.  Giving up on old request.",
2772                client->shortname,
2773                request->packet->src_port, request->packet->id,
2774                request->number);
2775
2776         /*
2777          *      Nuke it from the request hash, so we can receive new
2778          *      packets.
2779          */
2780         remove_from_request_hash(request);
2781
2782         switch (request->child_state) {
2783                 /*
2784                  *      Tell it to stop, and wait for it to do so.
2785                  */
2786         default:
2787                 request->master_state = REQUEST_STOP_PROCESSING;
2788                 request->delay += request->delay >> 1;
2789
2790                 tv_add(&request->when, request->delay);
2791
2792                 INSERT_EVENT(wait_for_child_to_die, request);
2793                 return;
2794
2795                 /*
2796                  *      Catch race conditions.  It may have switched
2797                  *      from running to done while this code is being
2798                  *      executed.
2799                  */
2800         case REQUEST_REJECT_DELAY:
2801         case REQUEST_CLEANUP_DELAY:
2802         case REQUEST_DONE:
2803                 break;
2804         }
2805 }
2806
2807
2808 static int can_handle_new_request(RADIUS_PACKET *packet,
2809                                   RADCLIENT *client,
2810                                   struct main_config_t *root)
2811 {
2812         /*
2813          *      Count the total number of requests, to see if
2814          *      there are too many.  If so, return with an
2815          *      error.
2816          */
2817         if (root->max_requests) {
2818                 int request_count = fr_packet_list_num_elements(pl);
2819
2820                 /*
2821                  *      This is a new request.  Let's see if
2822                  *      it makes us go over our configured
2823                  *      bounds.
2824                  */
2825                 if (request_count > root->max_requests) {
2826                         radlog(L_ERR, "Dropping request (%d is too many): "
2827                                "from client %s port %d - ID: %d", request_count,
2828                                client->shortname,
2829                                packet->src_port, packet->id);
2830                         radlog(L_INFO, "WARNING: Please check the configuration file.\n"
2831                                "\tThe value for 'max_requests' is probably set too low.\n");
2832                         return 0;
2833                 } /* else there were a small number of requests */
2834         } /* else there was no configured limit for requests */
2835
2836         /*
2837          *      FIXME: Add per-client checks.  If one client is sending
2838          *      too many packets, start discarding them.
2839          *
2840          *      We increment the counters here, and decrement them
2841          *      when the response is sent... somewhere in this file.
2842          */
2843
2844         /*
2845          *      FUTURE: Add checks for system load.  If the system is
2846          *      busy, start dropping requests...
2847          *
2848          *      We can probably keep some statistics ourselves...  if
2849          *      there are more requests coming in than we can handle,
2850          *      start dropping some.
2851          */
2852
2853         return 1;
2854 }
2855
2856
2857 int received_request(rad_listen_t *listener,
2858                      RADIUS_PACKET *packet, REQUEST **prequest,
2859                      RADCLIENT *client)
2860 {
2861         RADIUS_PACKET **packet_p;
2862         REQUEST *request = NULL;
2863         struct main_config_t *root = &mainconfig;
2864
2865         packet_p = fr_packet_list_find(pl, packet);
2866         if (packet_p) {
2867                 request = fr_packet2myptr(REQUEST, packet, packet_p);
2868                 rad_assert(request->in_request_hash);
2869
2870                 if ((request->packet->data_len == packet->data_len) &&
2871                     (memcmp(request->packet->vector, packet->vector,
2872                             sizeof(packet->vector)) == 0)) {
2873                         received_retransmit(request, client);
2874                         return 0;
2875                 }
2876
2877                 /*
2878                  *      The new request is different from the old one,
2879                  *      but maybe the old is finished.  If so, delete
2880                  *      the old one.
2881                  */
2882                 switch (request->child_state) {
2883                         struct timeval when;
2884
2885                 default:
2886                         /*
2887                          *      Special hacks for race conditions.
2888                          *      The reply is encoded, and therefore
2889                          *      likely sent.  We received a *new*
2890                          *      packet from the client, likely before
2891                          *      the next line or two of code which
2892                          *      updated the child state.  In this
2893                          *      case, just accept the new request.
2894                          */
2895                         if ((request->reply->code != 0) &&
2896                             request->reply->data) {
2897                                 radlog(L_INFO, "WARNING: Allowing fast client %s port %d - ID: %d for recent request %d.",
2898                                        client->shortname,
2899                                        packet->src_port, packet->id,
2900                                        request->number);
2901                                 remove_from_request_hash(request);
2902                                 request = NULL;
2903                                 break;
2904                         }
2905
2906                         gettimeofday(&when, NULL);
2907                         when.tv_sec -= 1;
2908
2909                         /*
2910                          *      If the cached request was received
2911                          *      within the last second, then we
2912                          *      discard the NEW request instead of the
2913                          *      old one.  This will happen ONLY when
2914                          *      the client is severely broken, and is
2915                          *      sending conflicting packets very
2916                          *      quickly.
2917                          */
2918                         if (timercmp(&when, &request->received, <)) {
2919                                 radlog(L_ERR, "Discarding conflicting packet from "
2920                                        "client %s port %d - ID: %d due to recent request %d.",
2921                                        client->shortname,
2922                                        packet->src_port, packet->id,
2923                                        request->number);
2924                                 return 0;
2925                         }
2926
2927                         received_conflicting_request(request, client);
2928                         request = NULL;
2929                         break;
2930
2931                 case REQUEST_REJECT_DELAY:
2932                 case REQUEST_CLEANUP_DELAY:
2933                         request->child_state = REQUEST_DONE;
2934                 case REQUEST_DONE:
2935                         cleanup_delay(request);
2936                         request = NULL;
2937                         break;
2938                 }
2939         }
2940
2941         /*
2942          *      We may want to quench the new request.
2943          */
2944         if ((listener->type != RAD_LISTEN_DETAIL) &&
2945             !can_handle_new_request(packet, client, root)) {
2946                 return 0;
2947         }
2948
2949         /*
2950          *      Create and initialize the new request.
2951          */
2952         request = request_alloc(); /* never fails */
2953
2954         if ((request->reply = rad_alloc(0)) == NULL) {
2955                 radlog(L_ERR, "No memory");
2956                 exit(1);
2957         }
2958
2959         request->listener = listener;
2960         request->client = client;
2961         request->packet = packet;
2962         request->packet->timestamp = request->timestamp;
2963         request->number = request_num_counter++;
2964         request->priority = listener->type;
2965 #ifdef HAVE_PTHREAD_H
2966         request->child_pid = NO_SUCH_CHILD_PID;
2967 #endif
2968
2969         /*
2970          *      Status-Server packets go to the head of the queue.
2971          */
2972         if (request->packet->code == PW_STATUS_SERVER) request->priority = 0;
2973
2974         /*
2975          *      Set virtual server identity
2976          */
2977         if (client->server) {
2978                 request->server = client->server;
2979         } else if (listener->server) {
2980                 request->server = listener->server;
2981         } else {
2982                 request->server = NULL;
2983         }
2984
2985         /*
2986          *      Remember the request in the list.
2987          */
2988         if (!fr_packet_list_insert(pl, &request->packet)) {
2989                 radlog(L_ERR, "Failed to insert request %d in the list of live requests: discarding", request->number);
2990                 ev_request_free(&request);
2991                 return 0;
2992         }
2993
2994         request->in_request_hash = TRUE;
2995         request->root = root;
2996         root->refcount++;
2997 #ifdef WITH_TCP
2998         request->listener->count++;
2999 #endif
3000
3001         /*
3002          *      The request passes many of our sanity checks.
3003          *      From here on in, if anything goes wrong, we
3004          *      send a reject message, instead of dropping the
3005          *      packet.
3006          */
3007
3008         /*
3009          *      Build the reply template from the request.
3010          */
3011
3012         request->reply->sockfd = request->packet->sockfd;
3013         request->reply->dst_ipaddr = request->packet->src_ipaddr;
3014         request->reply->src_ipaddr = request->packet->dst_ipaddr;
3015         request->reply->dst_port = request->packet->src_port;
3016         request->reply->src_port = request->packet->dst_port;
3017         request->reply->id = request->packet->id;
3018         request->reply->code = 0; /* UNKNOWN code */
3019         memcpy(request->reply->vector, request->packet->vector,
3020                sizeof(request->reply->vector));
3021         request->reply->vps = NULL;
3022         request->reply->data = NULL;
3023         request->reply->data_len = 0;
3024
3025         request->master_state = REQUEST_ACTIVE;
3026         request->child_state = REQUEST_QUEUED;
3027         request->next_callback = NULL;
3028
3029         gettimeofday(&request->received, NULL);
3030         request->timestamp = request->received.tv_sec;
3031         request->when = request->received;
3032
3033         request->delay = USEC;
3034
3035         tv_add(&request->when, request->delay);
3036
3037         INSERT_EVENT(wait_a_bit, request);
3038
3039         *prequest = request;
3040         return 1;
3041 }
3042
3043
3044 #ifdef WITH_PROXY
3045 REQUEST *received_proxy_response(RADIUS_PACKET *packet)
3046 {
3047         char            buffer[128];
3048         REQUEST         *request;
3049
3050         /*
3051          *      Also removes from the proxy hash if responses == requests
3052          */
3053         request = lookup_in_proxy_hash(packet);
3054
3055         if (!request) {
3056                 radlog(L_PROXY, "No outstanding request was found for reply from host %s port %d - ID %d",
3057                        inet_ntop(packet->src_ipaddr.af,
3058                                  &packet->src_ipaddr.ipaddr,
3059                                  buffer, sizeof(buffer)),
3060                        packet->src_port, packet->id);
3061                 return NULL;
3062         }
3063
3064         /*
3065          *      We haven't replied to the NAS, but we have seen an
3066          *      earlier reply from the home server.  Ignore this packet,
3067          *      as we're likely still processing the previous reply.
3068          */
3069         if (request->proxy_reply) {
3070                 if (memcmp(request->proxy_reply->vector,
3071                            packet->vector,
3072                            sizeof(request->proxy_reply->vector)) == 0) {
3073                         RDEBUG2("Discarding duplicate reply from host %s port %d  - ID: %d for request %d",
3074                                inet_ntop(packet->src_ipaddr.af,
3075                                          &packet->src_ipaddr.ipaddr,
3076                                          buffer, sizeof(buffer)),
3077                                packet->src_port, packet->id,
3078                                request->number);
3079                 } else {
3080                         /*
3081                          *      ? The home server gave us a new proxy
3082                          *      reply which doesn't match the old
3083                          *      one.  Delete it.
3084                          */
3085                         RDEBUG2("Ignoring conflicting proxy reply");
3086                 }
3087
3088                 /* assert that there's an event queued for request? */
3089                 return NULL;
3090         }
3091
3092         /*
3093          *      Verify the packet before doing ANYTHING with it.  This
3094          *      means we're doing more MD5 checks in the server core.
3095          *      However, we can fix that by moving to multiple threads
3096          *      listening on sockets.
3097          *
3098          *      We do this AFTER looking the request up in the hash,
3099          *      and AFTER vhecking if we saw a previous request.  This
3100          *      helps minimize the DoS effect of people attacking us
3101          *      with spoofed packets.
3102          */
3103         if (rad_verify(packet, request->proxy,
3104                        request->home_server->secret) != 0) {
3105                 DEBUG("Ignoring spoofed proxy reply.  Signature is invalid");
3106                 return NULL;
3107         }
3108
3109         gettimeofday(&now, NULL);
3110
3111         /*
3112          *      Maybe move this earlier in the decision process?
3113          *      Having it here means that late or duplicate proxy
3114          *      replies no longer get the home server marked as
3115          *      "alive".  This might be good for stability, though.
3116          *
3117          *      FIXME: Do we really want to do this whenever we
3118          *      receive a packet?  Setting this here means that we
3119          *      mark it alive on *any* packet, even if it's lost all
3120          *      of the *other* packets in the last 10s.
3121          */
3122         request->home_server->state = HOME_STATE_ALIVE;
3123
3124 #ifdef WITH_COA
3125         /*
3126          *      When originating CoA, the "proxy" reply is the reply
3127          *      to the CoA request that we originated.  At this point,
3128          *      the original request is finished, and it has a reply.
3129          *
3130          *      However, if we haven't separated the two requests, do
3131          *      so now.  This is done so that cleaning up the original
3132          *      request won't cause the CoA request to be free'd.  See
3133          *      util.c, request_free()
3134          */
3135         if (request->parent && (request->parent->coa == request)) {
3136                 request->parent->coa = NULL;
3137                 request->parent = NULL;
3138
3139         } else
3140                 /*
3141                  *      Skip the next set of checks, as the original
3142                  *      reply is cached.  We want to be able to still
3143                  *      process the CoA reply, AND to reference the
3144                  *      original request/reply.
3145                  *
3146                  *      This is getting to be really quite a bit of a
3147                  *      hack.
3148                  */
3149 #endif
3150
3151         /*
3152          *      If there's a reply to the NAS, ignore everything
3153          *      related to proxy responses
3154          */
3155         if (request->reply && request->reply->code != 0) {
3156                 RDEBUG2("Ignoring proxy reply that arrived after we sent a reply to the NAS");
3157                 return NULL;
3158         }
3159
3160 #ifdef WITH_STATS
3161         /*
3162          *      The average includes our time to receive packets and
3163          *      look them up in the hashes, which should be the same
3164          *      for all packets.
3165          *
3166          *      We update the response time only for the FIRST packet
3167          *      we receive.
3168          */
3169         if (request->home_server->ema.window > 0) {
3170                 radius_stats_ema(&request->home_server->ema,
3171                                  &now, &request->proxy_when);
3172         }
3173 #endif
3174
3175         switch (request->child_state) {
3176         case REQUEST_QUEUED:
3177         case REQUEST_RUNNING:
3178                 radlog(L_ERR, "Internal sanity check failed for child state");
3179                 /* FALL-THROUGH */
3180
3181         case REQUEST_REJECT_DELAY:
3182         case REQUEST_CLEANUP_DELAY:
3183         case REQUEST_DONE:
3184                 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'",
3185                        inet_ntop(packet->src_ipaddr.af,
3186                                  &packet->src_ipaddr.ipaddr,
3187                                  buffer, sizeof(buffer)),
3188                        packet->src_port, packet->id,
3189                        request->number);
3190                 /* assert that there's an event queued for request? */
3191                 return NULL;
3192
3193         case REQUEST_PROXIED:
3194                 break;
3195         }
3196
3197         request->proxy_reply = packet;
3198
3199 #if 0
3200         /*
3201          *      Perform RTT calculations, as per RFC 2988 (for TCP).
3202          *      Note that we only do so on the first response.
3203          */
3204         if ((request->num_proxied_responses == 1)
3205                 int rtt;
3206                 home_server *home = request->home_server;
3207
3208                 rtt = now.tv_sec - request->proxy_when.tv_sec;
3209                 rtt *= USEC;
3210                 rtt += now.tv_usec;
3211                 rtt -= request->proxy_when.tv_usec;
3212
3213                 if (!home->has_rtt) {
3214                         home->has_rtt = TRUE;
3215
3216                         home->srtt = rtt;
3217                         home->rttvar = rtt / 2;
3218
3219                 } else {
3220                         home->rttvar -= home->rttvar >> 2;
3221                         home->rttvar += (home->srtt - rtt);
3222                         home->srtt -= home->srtt >> 3;
3223                         home->srtt += rtt >> 3;
3224                 }
3225
3226                 home->rto = home->srtt;
3227                 if (home->rttvar > (USEC / 4)) {
3228                         home->rto += home->rttvar * 4;
3229                 } else {
3230                         home->rto += USEC;
3231                 }
3232         }
3233 #endif
3234
3235         /*
3236          *      There's no incoming request, so it's a proxied packet
3237          *      we originated.
3238          */
3239         if (!request->packet) {
3240                 received_response_to_ping(request);
3241                 request->proxy_reply = NULL; /* caller will free it */
3242                 ev_request_free(&request);
3243                 return NULL;
3244         }
3245
3246         request->child_state = REQUEST_QUEUED;
3247         request->when = now;
3248         request->delay = USEC;
3249         request->priority = RAD_LISTEN_PROXY;
3250         tv_add(&request->when, request->delay);
3251
3252         /*
3253          *      Wait a bit will take care of max_request_time
3254          */
3255         INSERT_EVENT(wait_a_bit, request);
3256
3257         return request;
3258 }
3259
3260 #endif /* WITH_PROXY */
3261
3262 #ifdef WITH_TCP
3263 static void tcp_socket_lifetime(void *ctx)
3264 {
3265         rad_listen_t *listener = ctx;
3266         char buffer[256];
3267
3268         listener->print(listener, buffer, sizeof(buffer));
3269
3270         DEBUG("Reached maximum lifetime on socket %s", buffer);
3271
3272         listener->status = RAD_LISTEN_STATUS_CLOSED;
3273         event_new_fd(listener);
3274 }
3275
3276 static void tcp_socket_idle_timeout(void *ctx)
3277 {
3278         rad_listen_t *listener = ctx;
3279         listen_socket_t *sock = listener->data;
3280         char buffer[256];
3281
3282         fr_event_now(el, &now); /* should always succeed... */
3283
3284         rad_assert(sock->home != NULL);
3285
3286         /*
3287          *      We implement idle timeout by polling, because it's
3288          *      cheaper than resetting the idle timeout every time
3289          *      we send / receive a packet.
3290          */
3291         if ((sock->last_packet + sock->home->idle_timeout) > now.tv_sec) {
3292                 struct timeval when;
3293                 void *fun = tcp_socket_idle_timeout;
3294
3295                 when.tv_sec = sock->last_packet;
3296                 when.tv_sec += sock->home->idle_timeout;
3297                 when.tv_usec = 0;
3298
3299                 if (sock->home->lifetime &&
3300                     (sock->opened + sock->home->lifetime < when.tv_sec)) {
3301                         when.tv_sec = sock->opened + sock->home->lifetime;
3302                         fun = tcp_socket_lifetime;
3303                 }
3304
3305                 if (!fr_event_insert(el, fun, listener, &when, &sock->ev)) {
3306                         rad_panic("Failed to insert event");
3307                 }
3308
3309                 return;
3310         }
3311
3312         listener->print(listener, buffer, sizeof(buffer));
3313
3314         DEBUG("Reached idle timeout on socket %s", buffer);
3315
3316         listener->status = RAD_LISTEN_STATUS_CLOSED;
3317         event_new_fd(listener);
3318 }
3319 #endif
3320
3321 void event_new_fd(rad_listen_t *this)
3322 {
3323         char buffer[1024];
3324
3325         if (this->status == RAD_LISTEN_STATUS_KNOWN) return;
3326
3327         this->print(this, buffer, sizeof(buffer));
3328
3329         if (this->status == RAD_LISTEN_STATUS_INIT) {
3330                 if (just_started) {
3331                         DEBUG("Listening on %s", buffer);
3332                 } else {
3333                         DEBUG2(" ... adding new socket %s", buffer);
3334                 }
3335
3336 #ifdef WITH_PROXY
3337                 /*
3338                  *      Add it to the list of sockets we can use.
3339                  *      Server sockets (i.e. auth/acct) are never
3340                  *      added to the packet list.
3341                  */
3342                 if (this->type == RAD_LISTEN_PROXY) {
3343                         listen_socket_t *sock = this->data;
3344
3345                         PTHREAD_MUTEX_LOCK(&proxy_mutex);
3346                         if (!fr_packet_list_socket_add(proxy_list, this->fd,
3347                                                        sock->proto,
3348                                                        &sock->other_ipaddr, sock->other_port,
3349                                                        this)) {
3350                                 radlog(L_ERR, "Fatal error adding socket: %s",
3351                                        fr_strerror());
3352                                 exit(1);
3353
3354                         }
3355
3356                         if (sock->home) {
3357                                 sock->home->num_connections++;
3358
3359                                 /*
3360                                  *      If necessary, add it to the list of
3361                                  *      new proxy listeners.
3362                                  */
3363                                 if (sock->home->lifetime || sock->home->idle_timeout) {
3364                                         this->next = proxy_listener_list;
3365                                         proxy_listener_list = this;
3366                                 }
3367                         }
3368                         PTHREAD_MUTEX_UNLOCK(&proxy_mutex);
3369
3370                         /*
3371                          *      Tell the main thread that we've added
3372                          *      a proxy listener, but only if we need
3373                          *      to update the event list.  Do this
3374                          *      with the mutex unlocked, to reduce
3375                          *      contention.
3376                          */
3377                         if (sock->home) {
3378                                 if (sock->home->lifetime || sock->home->idle_timeout) {
3379                                         radius_signal_self(RADIUS_SIGNAL_SELF_NEW_FD);
3380                                 }
3381                         }
3382                 }
3383 #endif
3384
3385 #ifdef WITH_DETAIL
3386                 /*
3387                  *      Detail files are always known, and aren't
3388                  *      put into the socket event loop.
3389                  */
3390                 if (this->type == RAD_LISTEN_DETAIL) {
3391                         this->status = RAD_LISTEN_STATUS_KNOWN;
3392
3393                         /*
3394                          *      Set up the first poll interval.
3395                          */
3396                         event_poll_detail(this);
3397                         return;
3398                 }
3399 #endif
3400
3401                 FD_MUTEX_LOCK(&fd_mutex);
3402                 if (!fr_event_fd_insert(el, 0, this->fd,
3403                                         event_socket_handler, this)) {
3404                         radlog(L_ERR, "Failed remembering handle for proxy socket!");
3405                         exit(1);
3406                 }
3407                 FD_MUTEX_UNLOCK(&fd_mutex);
3408
3409                 this->status = RAD_LISTEN_STATUS_KNOWN;
3410                 return;
3411         }
3412
3413         /*
3414          *      Something went wrong with the socket: make it harmless.
3415          */
3416         if (this->status == RAD_LISTEN_STATUS_REMOVE_FD) {
3417                 int devnull;
3418
3419                 /*
3420                  *      Remove it from the list of live FD's.
3421                  */
3422                 FD_MUTEX_LOCK(&fd_mutex);
3423                 fr_event_fd_delete(el, 0, this->fd);
3424                 FD_MUTEX_UNLOCK(&fd_mutex);
3425
3426 #ifdef WITH_PROXY
3427                 if (this->type != RAD_LISTEN_PROXY)
3428 #endif
3429                 {
3430                         if (this->count != 0) {
3431                                 fr_packet_list_walk(pl, this,
3432                                                     remove_all_requests);
3433                         }
3434
3435                         if (this->count == 0) {
3436                                 this->status = RAD_LISTEN_STATUS_FINISH;
3437                                 goto finish;
3438                         }
3439                 }
3440 #ifdef WITH_PROXY
3441                 else {
3442                         int count = this->count;
3443
3444                         /*
3445                          *      Duplicate code
3446                          */
3447                         PTHREAD_MUTEX_LOCK(&proxy_mutex);
3448                         if (!fr_packet_list_socket_freeze(proxy_list,
3449                                                           this->fd)) {
3450                                 radlog(L_ERR, "Fatal error freezing socket: %s",
3451                                        fr_strerror());
3452                                 exit(1);
3453                         }
3454
3455                         /*
3456                          *      Doing this with the proxy mutex held
3457                          *      is a Bad Thing.  We should move to
3458                          *      finer-grained mutexes.
3459                          */
3460                         count = this->count;
3461                         if (count > 0) {
3462                                 fr_packet_list_walk(proxy_list, this,
3463                                                     remove_all_proxied_requests);
3464                         }
3465                         count = this->count; /* protected by mutex */
3466                         PTHREAD_MUTEX_UNLOCK(&proxy_mutex);
3467
3468                         if (count == 0) {
3469                                 this->status = RAD_LISTEN_STATUS_FINISH;
3470                                 goto finish;
3471                         }
3472                 }
3473 #endif
3474
3475                 /*
3476                  *      Re-open the socket, pointing it to /dev/null.
3477                  *      This means that all writes proceed without
3478                  *      blocking, and all reads return "no data".
3479                  *
3480                  *      This leaves the socket active, so any child
3481                  *      threads won't go insane.  But it means that
3482                  *      they cannot send or receive any packets.
3483                  *
3484                  *      This is EXTRA work in the normal case, when
3485                  *      sockets are closed without error.  But it lets
3486                  *      us have one simple processing method for all
3487                  *      sockets.
3488                  */
3489                 devnull = open("/dev/null", O_RDWR);
3490                 if (devnull < 0) {
3491                         radlog(L_ERR, "FATAL failure opening /dev/null: %s",
3492                                strerror(errno));
3493                         exit(1);
3494                 }
3495                 if (dup2(devnull, this->fd) < 0) {
3496                         radlog(L_ERR, "FATAL failure closing socket: %s",
3497                                strerror(errno));
3498                         exit(1);
3499                 }
3500                 close(devnull);
3501
3502                 this->status = RAD_LISTEN_STATUS_CLOSED;
3503
3504                 /*
3505                  *      Fall through to the next section.
3506                  */
3507         }
3508
3509         /*
3510          *      Called ONLY from the main thread.  On the following
3511          *      conditions:
3512          *
3513          *      idle timeout
3514          *      max lifetime
3515          *
3516          *      (and falling through from "forcibly close FD" above)
3517          *      client closed connection on us
3518          *      client sent us a bad packet.
3519          */
3520         if (this->status == RAD_LISTEN_STATUS_CLOSED) {
3521                 int count = this->count;
3522                 rad_assert(this->type != RAD_LISTEN_DETAIL);
3523
3524 #ifdef WITH_PROXY
3525                 /*
3526                  *      Remove it from the list of active sockets, so
3527                  *      that it isn't used when proxying new packets.
3528                  */
3529                 if (this->type == RAD_LISTEN_PROXY) {
3530                         PTHREAD_MUTEX_LOCK(&proxy_mutex);
3531                         if (!fr_packet_list_socket_freeze(proxy_list,
3532                                                           this->fd)) {
3533                                 radlog(L_ERR, "Fatal error freezing socket: %s",
3534                                        fr_strerror());
3535                                 exit(1);
3536                         }
3537                         count = this->count; /* protected by mutex */
3538                         PTHREAD_MUTEX_UNLOCK(&proxy_mutex);
3539                 }
3540 #endif
3541
3542                 /*
3543                  *      Requests are still using the socket.  Wait for
3544                  *      them to finish.
3545                  */
3546                 if (count != 0) {
3547                         struct timeval when;
3548                         listen_socket_t *sock = this->data;
3549
3550                         /*
3551                          *      Try again to clean up the socket in 30
3552                          *      seconds.
3553                          */
3554                         gettimeofday(&when, NULL);
3555                         when.tv_sec += 30;
3556
3557                         if (!fr_event_insert(el,
3558                                              (fr_event_callback_t) event_new_fd,
3559                                              this, &when, &sock->ev)) {
3560                                 rad_panic("Failed to insert event");
3561                         }
3562
3563                         return;
3564                 }
3565
3566                 /*
3567                  *      No one is using this socket: we can delete it
3568                  *      immediately.
3569                  */
3570                 this->status = RAD_LISTEN_STATUS_FINISH;
3571         }
3572
3573 finish:
3574         if (this->status == RAD_LISTEN_STATUS_FINISH) {
3575                 listen_socket_t *sock = this->data;
3576
3577                 rad_assert(this->count == 0);
3578                 DEBUG2(" ... closing socket %s", buffer);
3579
3580                 /*
3581                  *      Remove it from the list of live FD's.  Note
3582                  *      that it MAY also have been removed above.  We
3583                  *      do it again here, to catch the case of sockets
3584                  *      closing on idle timeout, or max
3585                  *      lifetime... AFTER all requests have finished
3586                  *      using it.
3587                  */
3588                 FD_MUTEX_LOCK(&fd_mutex);
3589                 fr_event_fd_delete(el, 0, this->fd);
3590                 FD_MUTEX_UNLOCK(&fd_mutex);
3591
3592 #ifdef WITH_PROXY
3593                 /*
3594                  *      Remove it from the list of sockets to be used
3595                  *      when proxying.
3596                  */
3597                 if (this->type == RAD_LISTEN_PROXY) {
3598                         PTHREAD_MUTEX_LOCK(&proxy_mutex);
3599                         if (!fr_packet_list_socket_remove(proxy_list,
3600                                                           this->fd, NULL)) {
3601                                 radlog(L_ERR, "Fatal error removing socket: %s",
3602                                        fr_strerror());
3603                                 exit(1);
3604                         }
3605                         if (sock->home) sock->home->num_connections--;
3606                         PTHREAD_MUTEX_UNLOCK(&proxy_mutex);
3607                 }
3608 #endif
3609
3610                 /*
3611                  *      Remove any pending cleanups.
3612                  */
3613                 if (sock->ev) fr_event_delete(el, &sock->ev);
3614
3615                 /*
3616                  *      And finally, close the socket.
3617                  */
3618                 listen_free(&this);
3619         }
3620 }
3621
3622 static void handle_signal_self(int flag)
3623 {
3624         if ((flag & (RADIUS_SIGNAL_SELF_EXIT | RADIUS_SIGNAL_SELF_TERM)) != 0) {
3625                 if ((flag & RADIUS_SIGNAL_SELF_EXIT) != 0) {
3626                         fr_event_loop_exit(el, 1);
3627                 } else {
3628                         fr_event_loop_exit(el, 2);
3629                 }
3630
3631                 return;
3632         } /* else exit/term flags weren't set */
3633
3634         /*
3635          *      Tell the even loop to stop processing.
3636          */
3637         if ((flag & RADIUS_SIGNAL_SELF_HUP) != 0) {
3638                 time_t when;
3639                 static time_t last_hup = 0;
3640
3641                 DEBUG("Received HUP signal.");
3642
3643                 when = time(NULL);
3644                 if ((int) (when - last_hup) < 5) {
3645                         radlog(L_INFO, "Ignoring HUP (less than 5s since last one)");
3646                         return;
3647                 }
3648                 last_hup = when;
3649
3650                 fr_event_loop_exit(el, 0x80);
3651         }
3652
3653 #ifdef WITH_DETAIL
3654         if ((flag & RADIUS_SIGNAL_SELF_DETAIL) != 0) {
3655                 rad_listen_t *this;
3656
3657                 /*
3658                  *      FIXME: O(N) loops suck.
3659                  */
3660                 for (this = mainconfig.listen;
3661                      this != NULL;
3662                      this = this->next) {
3663                         if (this->type != RAD_LISTEN_DETAIL) continue;
3664
3665                         /*
3666                          *      This one didn't send the signal, skip
3667                          *      it.
3668                          */
3669                         if (!this->decode(this, NULL)) continue;
3670
3671                         /*
3672                          *      Go service the interrupt.
3673                          */
3674                         event_poll_detail(this);
3675                 }
3676         }
3677 #endif
3678
3679 #ifdef WITH_PROXY
3680         /*
3681          *      Add event handlers for idle timeouts && maximum lifetime.XXX
3682          */
3683         if ((flag & RADIUS_SIGNAL_SELF_NEW_FD) != 0) {
3684                 struct timeval when;
3685                 void *fun = NULL;
3686
3687                 if (!fr_event_now(el, &now)) gettimeofday(&now, NULL);
3688
3689                 PTHREAD_MUTEX_LOCK(&proxy_mutex);
3690
3691                 while (proxy_listener_list) {
3692                         rad_listen_t *this = proxy_listener_list;
3693                         listen_socket_t *sock = this->data;
3694
3695                         proxy_listener_list = this->next;
3696                         this->next = NULL;
3697
3698                         if (!sock->home) continue; /* skip UDP sockets */
3699
3700                         when = now;
3701
3702                         if (!sock->home->idle_timeout) {
3703                                 rad_assert(sock->home->lifetime != 0);
3704
3705                                 when.tv_sec += sock->home->lifetime;
3706                                 fun = tcp_socket_lifetime;
3707                         } else {
3708                                 rad_assert(sock->home->idle_timeout != 0);
3709
3710                                 when.tv_sec += sock->home->idle_timeout;
3711                                 fun = tcp_socket_idle_timeout;
3712                         }
3713
3714                         if (!fr_event_insert(el, fun, this, &when,
3715                                              &(sock->ev))) {
3716                                 rad_panic("Failed to insert event");
3717                         }
3718                 }
3719
3720                 PTHREAD_MUTEX_UNLOCK(&proxy_mutex);
3721         }
3722 #endif
3723 }
3724
3725 #ifndef WITH_SELF_PIPE
3726 void radius_signal_self(int flag)
3727 {
3728         handle_signal_self(flag);
3729 }
3730 #else
3731 /*
3732  *      Inform ourselves that we received a signal.
3733  */
3734 void radius_signal_self(int flag)
3735 {
3736         ssize_t rcode;
3737         uint8_t buffer[16];
3738
3739         /*
3740          *      The read MUST be non-blocking for this to work.
3741          */
3742         rcode = read(self_pipe[0], buffer, sizeof(buffer));
3743         if (rcode > 0) {
3744                 ssize_t i;
3745
3746                 for (i = 0; i < rcode; i++) {
3747                         buffer[0] |= buffer[i];
3748                 }
3749         } else {
3750                 buffer[0] = 0;
3751         }
3752
3753         buffer[0] |= flag;
3754
3755         write(self_pipe[1], buffer, 1);
3756 }
3757
3758
3759 static void event_signal_handler(UNUSED fr_event_list_t *xel,
3760                                  UNUSED int fd, UNUSED void *ctx)
3761 {
3762         ssize_t i, rcode;
3763         uint8_t buffer[32];
3764
3765         rcode = read(self_pipe[0], buffer, sizeof(buffer));
3766         if (rcode <= 0) return;
3767
3768         /*
3769          *      Merge pending signals.
3770          */
3771         for (i = 0; i < rcode; i++) {
3772                 buffer[0] |= buffer[i];
3773         }
3774
3775         handle_signal_self(buffer[0]);
3776 }
3777 #endif
3778
3779
3780 static void event_socket_handler(fr_event_list_t *xel, UNUSED int fd,
3781                                  void *ctx)
3782 {
3783         rad_listen_t *listener = ctx;
3784         RAD_REQUEST_FUNP fun;
3785         REQUEST *request;
3786
3787         rad_assert(xel == el);
3788
3789         xel = xel;
3790
3791         if (listener->fd < 0) rad_panic("Socket was closed on us!");
3792
3793         if (!listener->recv(listener, &fun, &request)) return;
3794
3795         if (!thread_pool_addrequest(request, fun)) {
3796                 request->child_state = REQUEST_DONE;
3797         }
3798 }
3799
3800 typedef struct listen_detail_t {
3801         fr_event_t      *ev;
3802 } listen_detail_t;
3803
3804 /*
3805  *      This function is called periodically to see if this detail
3806  *      file is available for reading.
3807  */
3808 static void event_poll_detail(void *ctx)
3809 {
3810         int rcode, delay;
3811         RAD_REQUEST_FUNP fun;
3812         REQUEST *request;
3813         rad_listen_t *this = ctx;
3814         struct timeval when;
3815         listen_detail_t *detail = this->data;
3816
3817         rad_assert(this->type == RAD_LISTEN_DETAIL);
3818
3819         /*
3820          *      Try to read something.
3821          *
3822          *      FIXME: This does poll AND receive.
3823          */
3824         rcode = this->recv(this, &fun, &request);
3825         if (rcode != 0) {
3826                 rad_assert(fun != NULL);
3827                 rad_assert(request != NULL);
3828
3829                 if (!thread_pool_addrequest(request, fun)) {
3830                         request->child_state = REQUEST_DONE;
3831                 }
3832         }
3833
3834         if (!fr_event_now(el, &now)) gettimeofday(&now, NULL);
3835         when = now;
3836
3837         /*
3838          *      Backdoor API to get the delay until the next poll
3839          *      time.
3840          */
3841         delay = this->encode(this, NULL);
3842         tv_add(&when, delay);
3843
3844         if (!fr_event_insert(el, event_poll_detail, this,
3845                              &when, &detail->ev)) {
3846                 radlog(L_ERR, "Failed creating handler");
3847                 exit(1);
3848         }
3849 }
3850
3851
3852 static void event_status(struct timeval *wake)
3853 {
3854 #if !defined(HAVE_PTHREAD_H) && defined(WNOHANG)
3855         int argval;
3856 #endif
3857
3858         if (debug_flag == 0) {
3859                 if (just_started) {
3860                         radlog(L_INFO, "Ready to process requests.");
3861                         just_started = FALSE;
3862                 }
3863                 return;
3864         }
3865
3866         if (!wake) {
3867                 DEBUG("Ready to process requests.");
3868
3869         } else if ((wake->tv_sec != 0) ||
3870                    (wake->tv_usec >= 100000)) {
3871                 DEBUG("Waking up in %d.%01u seconds.",
3872                       (int) wake->tv_sec, (unsigned int) wake->tv_usec / 100000);
3873         }
3874
3875
3876         /*
3877          *      FIXME: Put this somewhere else, where it isn't called
3878          *      all of the time...
3879          */
3880
3881 #if !defined(HAVE_PTHREAD_H) && defined(WNOHANG)
3882         /*
3883          *      If there are no child threads, then there may
3884          *      be child processes.  In that case, wait for
3885          *      their exit status, and throw that exit status
3886          *      away.  This helps get rid of zxombie children.
3887          */
3888         while (waitpid(-1, &argval, WNOHANG) > 0) {
3889                 /* do nothing */
3890         }
3891 #endif
3892
3893 }
3894
3895 /*
3896  *      Externally-visibly functions.
3897  */
3898 int radius_event_init(CONF_SECTION *cs, int spawn_flag)
3899 {
3900         rad_listen_t *head = NULL;
3901
3902         if (el) return 0;
3903
3904         time(&fr_start_time);
3905
3906         el = fr_event_list_create(event_status);
3907         if (!el) return 0;
3908
3909         pl = fr_packet_list_create(0);
3910         if (!pl) return 0;      /* leak el */
3911
3912         request_num_counter = 0;
3913
3914 #ifdef WITH_PROXY
3915         if (mainconfig.proxy_requests) {
3916                 pthread_mutexattr_t attr;
3917
3918                 /*
3919                  *      Create the tree for managing proxied requests and
3920                  *      responses.
3921                  */
3922                 proxy_list = fr_packet_list_create(1);
3923                 if (!proxy_list) return 0;
3924
3925 #ifdef HAVE_PTHREAD_H
3926                 pthread_mutexattr_init(&attr);
3927
3928 #ifdef PTHREAD_MUTEX_RECURSIVE
3929                 if (pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_RECURSIVE) < 0) {
3930                         radlog(L_ERR, "FATAL: Failed to set type for proxy mutex: %s",
3931                                strerror(errno));
3932                         exit(1);
3933                 }
3934 #endif
3935
3936                 if (pthread_mutex_init(&proxy_mutex, NULL) != 0) {
3937                         radlog(L_ERR, "FATAL: Failed to initialize proxy mutex: %s",
3938                                strerror(errno));
3939                         exit(1);
3940                 }
3941
3942                 pthread_mutexattr_destroy(&attr);
3943 #endif
3944         }
3945 #endif
3946
3947         /*
3948          *      Just before we spawn the child threads, force the log
3949          *      subsystem to re-open the log file for every write.
3950          */
3951         if (spawn_flag) force_log_reopen();
3952
3953 #ifdef HAVE_PTHREAD_H
3954 #ifndef __MINGW32__
3955         NO_SUCH_CHILD_PID = (pthread_t ) (0);
3956 #else
3957         NO_SUCH_CHILD_PID = pthread_self(); /* not a child thread */
3958 #endif
3959         /*
3960          *      Initialize the threads ONLY if we're spawning, AND
3961          *      we're running normally.
3962          */
3963         if (spawn_flag && !check_config &&
3964             (thread_pool_init(cs, &spawn_flag) < 0)) {
3965                 exit(1);
3966         }
3967 #endif
3968
3969         /*
3970          *      Move all of the thread calls to this file?
3971          *
3972          *      It may be best for the mutexes to be in this file...
3973          */
3974         have_children = spawn_flag;
3975
3976         if (check_config) {
3977                 DEBUG("%s: #### Skipping IP addresses and Ports ####",
3978                        mainconfig.name);
3979                 return 1;
3980         }
3981
3982 #ifdef WITH_SELF_PIPE
3983         /*
3984          *      Child threads need a pipe to signal us, as do the
3985          *      signal handlers.
3986          */
3987         if (pipe(self_pipe) < 0) {
3988                 radlog(L_ERR, "radiusd: Error opening internal pipe: %s",
3989                        strerror(errno));
3990                 exit(1);
3991         }
3992         if (fcntl(self_pipe[0], F_SETFL, O_NONBLOCK | FD_CLOEXEC) < 0) {
3993                 radlog(L_ERR, "radiusd: Error setting internal flags: %s",
3994                        strerror(errno));
3995                 exit(1);
3996         }
3997         if (fcntl(self_pipe[1], F_SETFL, O_NONBLOCK | FD_CLOEXEC) < 0) {
3998                 radlog(L_ERR, "radiusd: Error setting internal flags: %s",
3999                        strerror(errno));
4000                 exit(1);
4001         }
4002
4003         if (!fr_event_fd_insert(el, 0, self_pipe[0],
4004                                   event_signal_handler, el)) {
4005                 radlog(L_ERR, "Failed creating handler for signals");
4006                 exit(1);
4007         }
4008 #endif  /* WITH_SELF_PIPE */
4009
4010        DEBUG("%s: #### Opening IP addresses and Ports ####",
4011                mainconfig.name);
4012
4013        /*
4014         *       The server temporarily switches to an unprivileged
4015         *       user very early in the bootstrapping process.
4016         *       However, some sockets MAY require privileged access
4017         *       (bind to device, or to port < 1024, or to raw
4018         *       sockets).  Those sockets need to call suid up/down
4019         *       themselves around the functions that need a privileged
4020         *       uid.
4021         */
4022         if (listen_init(cs, &head) < 0) {
4023                 _exit(1);
4024         }
4025
4026         mainconfig.listen = head;
4027
4028         /*
4029          *      At this point, no one has any business *ever* going
4030          *      back to root uid.
4031          */
4032         fr_suid_down_permanent();
4033
4034         return 1;
4035 }
4036
4037
4038 static int request_hash_cb(UNUSED void *ctx, void *data)
4039 {
4040         REQUEST *request = fr_packet2myptr(REQUEST, packet, data);
4041
4042 #ifdef WITH_PROXY
4043         rad_assert(request->in_proxy_hash == FALSE);
4044 #endif
4045
4046         ev_request_free(&request);
4047
4048         return 0;
4049 }
4050
4051
4052 #ifdef WITH_PROXY
4053 static int proxy_hash_cb(UNUSED void *ctx, void *data)
4054 {
4055         REQUEST *request = fr_packet2myptr(REQUEST, proxy, data);
4056
4057         ev_request_free(&request);
4058
4059         return 0;
4060 }
4061 #endif
4062
4063 void radius_event_free(void)
4064 {
4065         /*
4066          *      FIXME: Stop all threads, or at least check that
4067          *      they're all waiting on the semaphore, and the queues
4068          *      are empty.
4069          */
4070
4071 #ifdef WITH_PROXY
4072         /*
4073          *      There are requests in the proxy hash that aren't
4074          *      referenced from anywhere else.  Remove them first.
4075          */
4076         if (proxy_list) {
4077                 PTHREAD_MUTEX_LOCK(&proxy_mutex);
4078                 fr_packet_list_walk(proxy_list, NULL, proxy_hash_cb);
4079                 PTHREAD_MUTEX_UNLOCK(&proxy_mutex);
4080                 fr_packet_list_free(proxy_list);
4081                 proxy_list = NULL;
4082         }
4083 #endif
4084
4085         fr_packet_list_walk(pl, NULL, request_hash_cb);
4086
4087         fr_packet_list_free(pl);
4088         pl = NULL;
4089
4090         fr_event_list_free(el);
4091 }
4092
4093 int radius_event_process(void)
4094 {
4095         if (!el) return 0;
4096
4097         return fr_event_loop(el);
4098 }
4099
4100 void radius_handle_request(REQUEST *request, RAD_REQUEST_FUNP fun)
4101 {
4102         request->options = RAD_REQUEST_OPTION_DEBUG2;
4103
4104         if (request_pre_handler(request)) {
4105                 rad_assert(fun != NULL);
4106                 rad_assert(request != NULL);
4107
4108                 if (request->server) RDEBUG("server %s {",
4109                                             request->server != NULL ?
4110                                             request->server : "");
4111                 fun(request);
4112
4113                 if (request->server) RDEBUG("} # server %s",
4114                                              request->server != NULL ?
4115                                             request->server : "");
4116
4117                 request_post_handler(request);
4118         }
4119
4120         DEBUG2("Going to the next request");
4121         return;
4122 }