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 char *debug_condition;
  47
  48 /*
  49  *      Ridiculous amounts of local state.
  50  */
  51 static fr_event_list_t  *el = NULL;
  52 static fr_packet_list_t *pl = NULL;
  53 static int                      request_num_counter = 0;
  54 static struct timeval           now;
  55 time_t                          fr_start_time;
  56 static int                      have_children;
  57 static int                      just_started = TRUE;
  58
  59 #ifndef __MINGW32__
  60 #ifdef HAVE_PTHREAD_H
  61 #define WITH_SELF_PIPE (1)
  62 #endif
  63 #endif
  64
  65 #ifdef WITH_SELF_PIPE
  66 static int self_pipe[2];
  67 #endif
  68
  69 #ifdef HAVE_PTHREAD_H
  70 #ifdef WITH_PROXY
  71 static pthread_mutex_t  proxy_mutex;
  72 static rad_listen_t *proxy_listener_list = NULL;
  73 static int proxy_no_new_sockets = FALSE;
  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_sec += tv->tv_usec / USEC;
 148                 tv->tv_usec %= USEC;
 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         int done = FALSE;
 170         RADIUS_PACKET **proxy_p;
 171         REQUEST *request;
 172
 173         PTHREAD_MUTEX_LOCK(&proxy_mutex);
 174         proxy_p = fr_packet_list_find_byreply(proxy_list, reply);
 175
 176         if (!proxy_p) {
 177                 PTHREAD_MUTEX_UNLOCK(&proxy_mutex);
 178                 return NULL;
 179         }
 180
 181         request = fr_packet2myptr(REQUEST, proxy, proxy_p);
 182         request->num_proxied_responses++; /* needs to be protected by lock */
 183
 184         done = (request->num_proxied_requests == request->num_proxied_responses);
 185         PTHREAD_MUTEX_UNLOCK(&proxy_mutex);
 186
 187
 188         /*
 189          *      Catch the most common case of everything working
 190          *      correctly.
 191          */
 192         if (done) remove_from_proxy_hash(request);
 193
 194         return request;
 195 }
 196
 197
 198 static void remove_from_proxy_hash(REQUEST *request)
 199 {
 200         /*
 201          *      Check this without grabbing the mutex because it's a
 202          *      lot faster that way.
 203          */
 204         if (!request->in_proxy_hash) return;
 205
 206         /*
 207          *      The "not in hash" flag is definitive.  However, if the
 208          *      flag says that it IS in the hash, there might still be
 209          *      a race condition where it isn't.
 210          */
 211         PTHREAD_MUTEX_LOCK(&proxy_mutex);
 212
 213         if (!request->in_proxy_hash) {
 214                 PTHREAD_MUTEX_UNLOCK(&proxy_mutex);
 215                 return;
 216         }
 217
 218         fr_packet_list_yank(proxy_list, request->proxy);
 219         fr_packet_list_id_free(proxy_list, request->proxy);
 220
 221         /*
 222          *      On the FIRST reply, decrement the count of outstanding
 223          *      requests.  Note that this is NOT the count of sent
 224          *      packets, but whether or not the home server has
 225          *      responded at all.
 226          */
 227         if (!request->proxy_reply &&
 228             request->home_server &&
 229             request->home_server->currently_outstanding) {
 230                 request->home_server->currently_outstanding--;
 231         }
 232
 233 #ifdef WITH_TCP
 234         request->proxy_listener->count--;
 235         request->proxy_listener = NULL;
 236 #endif
 237
 238         /*
 239          *      Got from YES in hash, to NO, not in hash while we hold
 240          *      the mutex.  This guarantees that when another thread
 241          *      grabs the mutex, the "not in hash" flag is correct.
 242          */
 243         request->in_proxy_hash = FALSE;
 244
 245         PTHREAD_MUTEX_UNLOCK(&proxy_mutex);
 246 }
 247 #endif  /* WITH_PROXY */
 248
 249 static void ev_request_free(REQUEST **prequest)
 250 {
 251         REQUEST *request;
 252
 253         if (!prequest || !*prequest) return;
 254
 255         request = *prequest;
 256
 257 #ifdef WITH_COA
 258         if (request->coa) {
 259                 /*
 260                  *      Divorce the child from the parent first,
 261                  *      then clean up the child.
 262                  */
 263                 request->coa->parent = NULL;
 264                 ev_request_free(&request->coa);
 265         }
 266
 267         /*
 268          *      Divorce the parent from the child, and leave the
 269          *      parent still alive.
 270          */
 271         if (request->parent && (request->parent->coa == request)) {
 272                 request->parent->coa = NULL;
 273         }
 274 #endif
 275
 276         if (request->ev) fr_event_delete(el, &request->ev);
 277 #ifdef WITH_PROXY
 278         if (request->in_proxy_hash) remove_from_proxy_hash(request);
 279 #endif
 280         if (request->in_request_hash) remove_from_request_hash(request);
 281
 282         request_free(prequest);
 283 }
 284
 285 #ifdef WITH_TCP
 286 static int remove_all_requests(void *ctx, void *data)
 287 {
 288         rad_listen_t *this = ctx;
 289         RADIUS_PACKET **packet_p = data;
 290         REQUEST *request;
 291
 292         request = fr_packet2myptr(REQUEST, packet, packet_p);
 293         if (request->packet->sockfd != this->fd) return 0;
 294
 295         switch (request->child_state) {
 296         case REQUEST_RUNNING:
 297                 rad_assert(request->ev != NULL); /* or it's lost forever */
 298         case REQUEST_QUEUED:
 299                 request->master_state = REQUEST_STOP_PROCESSING;
 300                 return 0;
 301
 302                 /*
 303                  *      Waiting for a reply.  There's no point in
 304                  *      doing anything else.  We remove it from the
 305                  *      request hash so that we can close the upstream
 306                  *      socket.
 307                  */
 308         case REQUEST_PROXIED:
 309                 remove_from_request_hash(request);
 310                 request->child_state = REQUEST_DONE;
 311                 return 0;
 312
 313         case REQUEST_REJECT_DELAY:
 314         case REQUEST_CLEANUP_DELAY:
 315         case REQUEST_DONE:
 316                 ev_request_free(&request);
 317                 break;
 318         }
 319
 320         return 0;
 321 }
 322
 323 #ifdef WITH_PROXY
 324 static int remove_all_proxied_requests(void *ctx, void *data)
 325 {
 326         rad_listen_t *this = ctx;
 327         RADIUS_PACKET **proxy_p = data;
 328         REQUEST *request;
 329
 330         request = fr_packet2myptr(REQUEST, proxy, proxy_p);
 331         if (request->proxy->sockfd != this->fd) return 0;
 332
 333         switch (request->child_state) {
 334         case REQUEST_RUNNING:
 335                 rad_assert(request->ev != NULL); /* or it's lost forever */
 336         case REQUEST_QUEUED:
 337                 request->master_state = REQUEST_STOP_PROCESSING;
 338                 return 0;
 339
 340                 /*
 341                  *      Eventually we will discover that there is no
 342                  *      response to the proxied request.
 343                  */
 344         case REQUEST_PROXIED:
 345                 break;
 346
 347                 /*
 348                  *      Keep it in the cache for duplicate detection.
 349                  */
 350         case REQUEST_REJECT_DELAY:
 351         case REQUEST_CLEANUP_DELAY:
 352         case REQUEST_DONE:
 353                 break;
 354         }
 355
 356         remove_from_proxy_hash(request);
 357         return 0;
 358 }
 359 #endif  /* WITH_PROXY */
 360 #endif  /* WITH_TCP */
 361
 362
 363 #ifdef WITH_PROXY
 364 static int insert_into_proxy_hash(REQUEST *request)
 365 {
 366         char buf[128];
 367         int rcode, tries;
 368         void *proxy_listener;
 369
 370         rad_assert(request->proxy != NULL);
 371         rad_assert(proxy_list != NULL);
 372
 373         tries = 1;
 374 retry:
 375         PTHREAD_MUTEX_LOCK(&proxy_mutex);
 376         rcode = fr_packet_list_id_alloc(proxy_list,
 377                                         request->home_server->proto,
 378                                         request->proxy, &proxy_listener);
 379         PTHREAD_MUTEX_UNLOCK(&proxy_mutex);
 380
 381         if (!rcode) {
 382                 if (proxy_no_new_sockets) return 0;
 383
 384                 /*
 385                  *      Also locks the proxy mutex, so we have to call
 386                  *      it with the mutex unlocked.  Some systems
 387                  *      don't support recursive mutexes.
 388                  */
 389                 if (!proxy_new_listener(request->home_server, 0)) {
 390                         radlog(L_ERR, "Failed to create a new socket for proxying requests.");
 391                         return 0;
 392                 }
 393                 request->proxy->src_port = 0; /* Use any new socket */
 394
 395                 tries++;
 396                 if (tries > 2) {
 397                         RDEBUG2("ERROR: Failed allocating Id for new socket when proxying requests.");
 398                         return 0;
 399                 }
 400
 401                 goto retry;
 402         }
 403
 404         request->proxy_listener = proxy_listener;
 405
 406         PTHREAD_MUTEX_LOCK(&proxy_mutex);
 407         if (!fr_packet_list_insert(proxy_list, &request->proxy)) {
 408                 fr_packet_list_id_free(proxy_list, request->proxy);
 409                 PTHREAD_MUTEX_UNLOCK(&proxy_mutex);
 410                 radlog(L_PROXY, "Failed to insert entry into proxy list");
 411                 return 0;
 412         }
 413
 414         request->in_proxy_hash = TRUE;
 415
 416         /*
 417          *      Keep track of maximum outstanding requests to a
 418          *      particular home server.  'max_outstanding' is
 419          *      enforced in home_server_ldb(), in realms.c.
 420          */
 421         if (request->home_server) {
 422                 request->home_server->currently_outstanding++;
 423         }
 424
 425 #ifdef WITH_TCP
 426         request->proxy_listener->count++;
 427 #endif
 428
 429         PTHREAD_MUTEX_UNLOCK(&proxy_mutex);
 430
 431         RDEBUG3(" proxy: allocating destination %s port %d - Id %d",
 432                inet_ntop(request->proxy->dst_ipaddr.af,
 433                          &request->proxy->dst_ipaddr.ipaddr, buf, sizeof(buf)),
 434                request->proxy->dst_port,
 435                request->proxy->id);
 436
 437         return 1;
 438 }
 439
 440
 441 /*
 442  *      Called as BOTH an event, and in-line from other functions.
 443  */
 444 static void wait_for_proxy_id_to_expire(void *ctx)
 445 {
 446         REQUEST *request = ctx;
 447
 448         rad_assert(request->magic == REQUEST_MAGIC);
 449         rad_assert(request->proxy != NULL);
 450
 451         fr_event_now(el, &now);
 452         request->when = request->proxy_when;
 453
 454 #ifdef WITH_COA
 455         if (((request->proxy->code == PW_COA_REQUEST) ||
 456              (request->proxy->code == PW_DISCONNECT_REQUEST)) &&
 457             (request->packet->code != request->proxy->code)) {
 458                 request->when.tv_sec += request->home_server->coa_mrd;
 459         } else
 460 #endif
 461         request->when.tv_sec += request->home_server->response_window;
 462
 463         if ((request->num_proxied_requests == request->num_proxied_responses) ||
 464 #ifdef WITH_TCP
 465             (request->home_server->proto == IPPROTO_TCP) ||
 466 #endif
 467             timercmp(&now, &request->when, >)) {
 468                 if (request->packet) {
 469                         RDEBUG2("Cleaning up request %u ID %d with timestamp +%d",
 470                                request->number, request->packet->id,
 471                                (unsigned int) (request->timestamp - fr_start_time));
 472                 } else {
 473                         RDEBUG2("Cleaning up request %u with timestamp +%d",
 474                                request->number,
 475                                (unsigned int) (request->timestamp - fr_start_time));
 476                 }
 477
 478                 ev_request_free(&request);
 479                 return;
 480         }
 481
 482         INSERT_EVENT(wait_for_proxy_id_to_expire, request);
 483 }
 484 #endif
 485
 486 #ifdef HAVE_PTHREAD_H
 487 static void wait_for_child_to_die(void *ctx)
 488 {
 489         REQUEST *request = ctx;
 490
 491         rad_assert(request->magic == REQUEST_MAGIC);
 492
 493         /*
 494          *      If it's still queued (waiting for a thread to pick it
 495          *      up) OR, it's running AND there's still a child thread
 496          *      handling it, THEN delay some more.
 497          */
 498         if ((request->child_state == REQUEST_QUEUED) ||
 499             ((request->child_state == REQUEST_RUNNING) &&
 500              (pthread_equal(request->child_pid, NO_SUCH_CHILD_PID) == 0))) {
 501
 502                 /*
 503                  *      Cap delay at five minutes.
 504                  */
 505                 if (request->delay < (USEC * 60 * 5)) {
 506                         request->delay += (request->delay >> 1);
 507                         radlog(L_INFO, "WARNING: Child is hung for request %u in component %s module %s.",
 508                                request->number, request->component, request->module);
 509                 } else {
 510                         RDEBUG2("Child is still stuck for request %u",
 511                                 request->number);
 512                 }
 513                 tv_add(&request->when, request->delay);
 514
 515                 INSERT_EVENT(wait_for_child_to_die, request);
 516                 return;
 517         }
 518
 519         RDEBUG2("Child is finally responsive for request %u", request->number);
 520         remove_from_request_hash(request);
 521
 522 #ifdef WITH_PROXY
 523         if (request->proxy) {
 524                 wait_for_proxy_id_to_expire(request);
 525                 return;
 526         }
 527 #endif
 528
 529         ev_request_free(&request);
 530 }
 531 #endif
 532
 533 static void cleanup_delay(void *ctx)
 534 {
 535         REQUEST *request = ctx;
 536
 537         rad_assert(request->magic == REQUEST_MAGIC);
 538         rad_assert((request->child_state == REQUEST_CLEANUP_DELAY) ||
 539                    (request->child_state == REQUEST_DONE));
 540
 541         remove_from_request_hash(request);
 542
 543 #ifdef WITH_PROXY
 544         if (request->proxy && request->in_proxy_hash) {
 545                 wait_for_proxy_id_to_expire(request);
 546                 return;
 547         }
 548 #endif
 549
 550         RDEBUG2("Cleaning up request %u ID %d with timestamp +%d",
 551                request->number, request->packet->id,
 552                (unsigned int) (request->timestamp - fr_start_time));
 553
 554         ev_request_free(&request);
 555 }
 556
 557
 558 /*
 559  *      In daemon mode, AND this request has debug flags set.
 560  */
 561 #define DEBUG_PACKET if (!debug_flag && request->options && request->radlog) debug_packet
 562
 563 static void debug_packet(REQUEST *request, RADIUS_PACKET *packet, int direction)
 564 {
 565         VALUE_PAIR *vp;
 566         char buffer[1024];
 567         const char *received, *from;
 568         const fr_ipaddr_t *ip;
 569         int port;
 570
 571         if (!packet) return;
 572
 573         rad_assert(request->radlog != NULL);
 574
 575         if (direction == 0) {
 576                 received = "Received";
 577                 from = "from";  /* what else? */
 578                 ip = &packet->src_ipaddr;
 579                 port = packet->src_port;
 580
 581         } else {
 582                 received = "Sending";
 583                 from = "to";    /* hah! */
 584                 ip = &packet->dst_ipaddr;
 585                 port = packet->dst_port;
 586         }
 587
 588         /*
 589          *      Client-specific debugging re-prints the input
 590          *      packet into the client log.
 591          *
 592          *      This really belongs in a utility library
 593          */
 594         if ((packet->code > 0) && (packet->code < FR_MAX_PACKET_CODE)) {
 595                 RDEBUG("%s %s packet %s host %s port %d, id=%d, length=%d",
 596                        received, fr_packet_codes[packet->code], from,
 597                        inet_ntop(ip->af, &ip->ipaddr, buffer, sizeof(buffer)),
 598                        port, packet->id, packet->data_len);
 599         } else {
 600                 RDEBUG("%s packet %s host %s port %d code=%d, id=%d, length=%d",
 601                        received, from,
 602                        inet_ntop(ip->af, &ip->ipaddr, buffer, sizeof(buffer)),
 603                        port,
 604                        packet->code, packet->id, packet->data_len);
 605         }
 606
 607         for (vp = packet->vps; vp != NULL; vp = vp->next) {
 608                 vp_prints(buffer, sizeof(buffer), vp);
 609                 request->radlog(L_DBG, 0, request, "\t%s", buffer);
 610         }
 611 }
 612
 613 static void reject_delay(void *ctx)
 614 {
 615         REQUEST *request = ctx;
 616
 617         rad_assert(request->magic == REQUEST_MAGIC);
 618         rad_assert(request->child_state == REQUEST_REJECT_DELAY);
 619
 620         RDEBUG2("Sending delayed reject for request %u", request->number);
 621
 622         DEBUG_PACKET(request, request->reply, 1);
 623
 624         request->listener->send(request->listener, request);
 625
 626         request->when.tv_sec += request->root->cleanup_delay;
 627         request->child_state = REQUEST_CLEANUP_DELAY;
 628
 629         INSERT_EVENT(cleanup_delay, request);
 630 }
 631
 632
 633 #ifdef WITH_PROXY
 634 void revive_home_server(void *ctx)
 635 {
 636         home_server *home = ctx;
 637         char buffer[128];
 638
 639 #ifdef WITH_TCP
 640         rad_assert(home->proto != IPPROTO_TCP);
 641 #endif
 642
 643         home->state = HOME_STATE_ALIVE;
 644         home->currently_outstanding = 0;
 645         home->revive_time = now;
 646
 647         /*
 648          *      Delete any outstanding events.
 649          */
 650         if (home->ev) fr_event_delete(el, &home->ev);
 651
 652         radlog(L_PROXY, "Marking home server %s port %d alive again... we have no idea if it really is alive or not.",
 653                inet_ntop(home->ipaddr.af, &home->ipaddr.ipaddr,
 654                          buffer, sizeof(buffer)),
 655                home->port);
 656
 657 }
 658
 659
 660 static void no_response_to_ping(void *ctx)
 661 {
 662         REQUEST *request = ctx;
 663         home_server *home;
 664         char buffer[128];
 665
 666         rad_assert(request->home_server != NULL);
 667
 668         home = request->home_server;
 669 #ifdef WITH_TCP
 670         rad_assert(home->proto != IPPROTO_TCP);
 671 #endif
 672
 673         home->num_received_pings = 0;
 674
 675         radlog(L_ERR, "No response to status check %d for home server %s port %d",
 676                request->number,
 677                inet_ntop(request->proxy->dst_ipaddr.af,
 678                          &request->proxy->dst_ipaddr.ipaddr,
 679                          buffer, sizeof(buffer)),
 680                request->proxy->dst_port);
 681
 682         check_for_zombie_home_server(request);
 683
 684         wait_for_proxy_id_to_expire(request);
 685 }
 686
 687
 688 static void received_response_to_ping(REQUEST *request)
 689 {
 690         home_server *home;
 691         char buffer[128];
 692
 693         rad_assert(request->home_server != NULL);
 694
 695         home = request->home_server;
 696 #ifdef WITH_TCP
 697         rad_assert(home->proto != IPPROTO_TCP);
 698 #endif
 699
 700         home->num_received_pings++;
 701
 702         radlog(L_PROXY, "Received response to status check %d (%d in current sequence)",
 703                request->number, home->num_received_pings);
 704
 705         /*
 706          *      Remove the request from any hashes
 707          */
 708         fr_event_delete(el, &request->ev);
 709         remove_from_proxy_hash(request);
 710         rad_assert(request->in_request_hash == FALSE);
 711
 712         /*
 713          *      The control socket may have marked the home server as
 714          *      alive.  OR, it may have suddenly started responding to
 715          *      requests again.  If so, don't re-do the "make alive"
 716          *      work.
 717          */
 718         if (home->state == HOME_STATE_ALIVE) return;
 719
 720         /*
 721          *      We haven't received enough ping responses to mark it
 722          *      "alive".  Wait a bit.
 723          */
 724         if (home->num_received_pings < home->num_pings_to_alive) {
 725                 return;
 726         }
 727
 728         home->state = HOME_STATE_ALIVE;
 729         home->currently_outstanding = 0;
 730         home->revive_time = now;
 731
 732         if (!fr_event_delete(el, &home->ev)) {
 733                 RDEBUG2("Hmm... no event for home server.  Oh well.");
 734         }
 735
 736         radlog(L_PROXY, "Marking home server %s port %d alive",
 737                inet_ntop(request->proxy->dst_ipaddr.af,
 738                          &request->proxy->dst_ipaddr.ipaddr,
 739                          buffer, sizeof(buffer)),
 740                request->proxy->dst_port);
 741 }
 742
 743
 744 /*
 745  *      Called from start of zombie period, OR after control socket
 746  *      marks the home server dead.
 747  */
 748 static void ping_home_server(void *ctx)
 749 {
 750         uint32_t jitter;
 751         home_server *home = ctx;
 752         REQUEST *request;
 753         VALUE_PAIR *vp;
 754
 755 #ifdef WITH_TCP
 756         rad_assert(home->proto != IPPROTO_TCP);
 757 #endif
 758
 759         if ((home->state == HOME_STATE_ALIVE) ||
 760             (home->ping_check == HOME_PING_CHECK_NONE) ||
 761             (home->ev != NULL)) {
 762                 return;
 763         }
 764
 765         request = request_alloc();
 766         request->number = request_num_counter++;
 767
 768         request->proxy = rad_alloc(1);
 769         rad_assert(request->proxy != NULL);
 770
 771         fr_event_now(el, &request->when);
 772         home->when = request->when;
 773
 774         if (home->ping_check == HOME_PING_CHECK_STATUS_SERVER) {
 775                 request->proxy->code = PW_STATUS_SERVER;
 776
 777                 radius_pairmake(request, &request->proxy->vps,
 778                                 "Message-Authenticator", "0x00", T_OP_SET);
 779
 780         } else if (home->type == HOME_TYPE_AUTH) {
 781                 request->proxy->code = PW_AUTHENTICATION_REQUEST;
 782
 783                 radius_pairmake(request, &request->proxy->vps,
 784                                 "User-Name", home->ping_user_name, T_OP_SET);
 785                 radius_pairmake(request, &request->proxy->vps,
 786                                 "User-Password", home->ping_user_password, T_OP_SET);
 787                 radius_pairmake(request, &request->proxy->vps,
 788                                 "Service-Type", "Authenticate-Only", T_OP_SET);
 789                 radius_pairmake(request, &request->proxy->vps,
 790                                 "Message-Authenticator", "0x00", T_OP_SET);
 791
 792         } else {
 793 #ifdef WITH_ACCOUNTING
 794                 request->proxy->code = PW_ACCOUNTING_REQUEST;
 795
 796                 radius_pairmake(request, &request->proxy->vps,
 797                                 "User-Name", home->ping_user_name, T_OP_SET);
 798                 radius_pairmake(request, &request->proxy->vps,
 799                                 "Acct-Status-Type", "Stop", T_OP_SET);
 800                 radius_pairmake(request, &request->proxy->vps,
 801                                 "Acct-Session-Id", "00000000", T_OP_SET);
 802                 vp = radius_pairmake(request, &request->proxy->vps,
 803                                      "Event-Timestamp", "0", T_OP_SET);
 804                 vp->vp_date = now.tv_sec;
 805 #else
 806                 rad_assert("Internal sanity check failed");
 807 #endif
 808         }
 809
 810         radius_pairmake(request, &request->proxy->vps,
 811                         "NAS-Identifier", "Status Check. Are you alive?",
 812                         T_OP_SET);
 813
 814         request->proxy->dst_ipaddr = home->ipaddr;
 815         request->proxy->dst_port = home->port;
 816         request->home_server = home;
 817
 818         rad_assert(request->proxy_listener == NULL);
 819
 820         if (!insert_into_proxy_hash(request)) {
 821                 radlog(L_PROXY, "Failed inserting status check %d into proxy hash.  Discarding it.",
 822                        request->number);
 823                 ev_request_free(&request);
 824                 return;
 825         }
 826         rad_assert(request->proxy_listener != NULL);
 827         request->proxy_listener->send(request->proxy_listener,
 828                                       request);
 829
 830         request->next_callback = NULL;
 831         request->child_state = REQUEST_PROXIED;
 832         request->when.tv_sec += home->ping_timeout;;
 833
 834         INSERT_EVENT(no_response_to_ping, request);
 835
 836         /*
 837          *      Add +/- 2s of jitter, as suggested in RFC 3539
 838          *      and in the Issues and Fixes draft.
 839          */
 840         home->when.tv_sec += home->ping_interval - 2;
 841
 842         jitter = fr_rand();
 843         jitter ^= (jitter >> 10);
 844         jitter &= ((1 << 23) - 1); /* 22 bits of 1 */
 845
 846         tv_add(&home->when, jitter);
 847
 848         INSERT_EVENT(ping_home_server, home);
 849 }
 850
 851
 852 void mark_home_server_dead(home_server *home, struct timeval *when)
 853 {
 854         int previous_state = home->state;
 855         char buffer[128];
 856
 857         radlog(L_PROXY, "Marking home server %s port %d as dead.",
 858                inet_ntop(home->ipaddr.af, &home->ipaddr.ipaddr,
 859                          buffer, sizeof(buffer)),
 860                home->port);
 861
 862         home->state = HOME_STATE_IS_DEAD;
 863         home->num_received_pings = 0;
 864
 865         if (home->ping_check != HOME_PING_CHECK_NONE) {
 866                 /*
 867                  *      If the control socket marks us dead, start
 868                  *      pinging.  Otherwise, we already started
 869                  *      pinging when it was marked "zombie".
 870                  */
 871                 if (previous_state == HOME_STATE_ALIVE) {
 872                         ping_home_server(home);
 873                 }
 874
 875         } else {
 876                 /*
 877                  *      Revive it after a fixed period of time.  This
 878                  *      is very, very, bad.
 879                  */
 880                 home->when = *when;
 881                 home->when.tv_sec += home->revive_interval;
 882
 883                 INSERT_EVENT(revive_home_server, home);
 884         }
 885 }
 886
 887 static void check_for_zombie_home_server(REQUEST *request)
 888 {
 889         home_server *home;
 890         struct timeval when;
 891
 892         home = request->home_server;
 893
 894         if (home->state != HOME_STATE_ZOMBIE) return;
 895
 896         when = home->zombie_period_start;
 897         when.tv_sec += home->zombie_period;
 898
 899         fr_event_now(el, &now);
 900         if (timercmp(&now, &when, <)) {
 901                 return;
 902         }
 903
 904         mark_home_server_dead(home, &request->when);
 905 }
 906
 907 static int proxy_to_virtual_server(REQUEST *request);
 908
 909 static int virtual_server_handler(UNUSED REQUEST *request)
 910 {
 911         proxy_to_virtual_server(request);
 912         return 0;
 913 }
 914
 915 static void proxy_fallback_handler(REQUEST *request)
 916 {
 917         /*
 918          *      A proper time is required for wait_a_bit.
 919          */
 920         request->delay = USEC / 10;
 921         gettimeofday(&now, NULL);
 922         request->next_when = now;
 923         tv_add(&request->next_when, request->delay);
 924         request->next_callback = wait_a_bit;
 925
 926         /*
 927          *      Re-queue the request.
 928          */
 929         request->child_state = REQUEST_QUEUED;
 930
 931         rad_assert(request->proxy != NULL);
 932         if (!thread_pool_addrequest(request, virtual_server_handler)) {
 933                 request->child_state = REQUEST_DONE;
 934         }
 935
 936 #ifdef HAVE_PTHREAD_H
 937         /*
 938          *      MAY free the request if we're over max_request_time,
 939          *      AND we're not in threaded mode!
 940          *
 941          *      Note that we call this ONLY if we're threaded, as
 942          *      if we're NOT threaded, request_post_handler() calls
 943          *      wait_a_bit(), which means that "request" may not
 944          *      exist any more...
 945          */
 946         if (have_children) wait_a_bit(request);
 947 #endif
 948 }
 949
 950
 951 static int setup_post_proxy_fail(REQUEST *request)
 952 {
 953         DICT_VALUE *dval = NULL;
 954         VALUE_PAIR *vp;
 955
 956         request->child_state = REQUEST_RUNNING;
 957
 958         if (request->packet->code == PW_AUTHENTICATION_REQUEST) {
 959                 dval = dict_valbyname(PW_POST_PROXY_TYPE, "Fail-Authentication");
 960
 961         } else if (request->packet->code == PW_ACCOUNTING_REQUEST) {
 962                 dval = dict_valbyname(PW_POST_PROXY_TYPE, "Fail-Accounting");
 963
 964 #ifdef WITH_COA
 965                 /*
 966                  *      See no_response_to_coa_request
 967                  */
 968         } else if (((request->packet->code >> 8) & 0xff) == PW_COA_REQUEST) {
 969                 request->packet->code &= 0xff; /* restore it */
 970
 971                 if (request->proxy->code == PW_COA_REQUEST) {
 972                         dval = dict_valbyname(PW_POST_PROXY_TYPE, "Fail-CoA");
 973
 974                 } else if (request->proxy->code == PW_DISCONNECT_REQUEST) {
 975                         dval = dict_valbyname(PW_POST_PROXY_TYPE, "Fail-Disconnect");
 976                 } else {
 977                         return 0;
 978                 }
 979
 980 #endif
 981         } else {
 982                 return 0;
 983         }
 984
 985         if (!dval) dval = dict_valbyname(PW_POST_PROXY_TYPE, "Fail");
 986
 987         if (!dval) {
 988                 pairdelete(&request->config_items, PW_POST_PROXY_TYPE);
 989                 return 0;
 990         }
 991
 992         vp = pairfind(request->config_items, PW_POST_PROXY_TYPE);
 993         if (!vp) vp = radius_paircreate(request, &request->config_items,
 994                                         PW_POST_PROXY_TYPE, PW_TYPE_INTEGER);
 995         vp->vp_integer = dval->value;
 996
 997         rad_assert(request->proxy_reply == NULL);
 998
 999         return 1;
1000 }
1001
1002
1003 static int null_handler(UNUSED REQUEST *request)
1004 {
1005         return 0;
1006 }
1007
1008 static void post_proxy_fail_handler(REQUEST *request)
1009 {
1010         /*
1011          *      A proper time is required for wait_a_bit.
1012          */
1013         request->delay = USEC / 10;
1014         gettimeofday(&now, NULL);
1015
1016         /*
1017          *      Not set up to run Post-Proxy-Type = Fail.
1018          *
1019          *      Mark the request as still running, and figure out what
1020          *      to do next.
1021          */
1022         if (!setup_post_proxy_fail(request)) {
1023                 request_post_handler(request);
1024
1025         } else {
1026                 /*
1027                  *      Re-queue the request.
1028                  */
1029                 request->child_state = REQUEST_QUEUED;
1030
1031                 /*
1032                  *      There is a post-proxy-type of fail.  We run
1033                  *      the request through the pre/post proxy
1034                  *      handlers, just like it was a real proxied
1035                  *      request.  However, we set the per-request
1036                  *      handler to NULL, as we don't want to do
1037                  *      anything else.
1038                  *
1039                  *      Note that when we're not threaded, this will
1040                  *      process the request even if it's greater than
1041                  *      max_request_time.  That's not fatal.
1042                  */
1043                 request->priority = 0;
1044                 rad_assert(request->proxy != NULL);
1045                 thread_pool_addrequest(request, null_handler);
1046         }
1047
1048         /*
1049          *      MAY free the request if we're over max_request_time,
1050          *      AND we're not in threaded mode!
1051          *
1052          *      Note that we call this ONLY if we're threaded, as
1053          *      if we're NOT threaded, request_post_handler() calls
1054          *      wait_a_bit(), which means that "request" may not
1055          *      exist any more...
1056          */
1057         if (have_children) wait_a_bit(request);
1058 }
1059
1060 /* maybe check this against wait_for_proxy_id_to_expire? */
1061 static void no_response_to_proxied_request(void *ctx)
1062 {
1063         REQUEST *request = ctx;
1064         home_server *home;
1065         char buffer[128];
1066
1067         rad_assert(request->magic == REQUEST_MAGIC);
1068
1069         if (request->master_state == REQUEST_STOP_PROCESSING) {
1070                 ev_request_free(&request);
1071                 return;
1072         }
1073
1074         rad_assert(request->child_state == REQUEST_PROXIED);
1075
1076         /*
1077          *      If we've failed over to an internal home server,
1078          *      replace the callback with the correct one.  This
1079          *      is due to locking issues with child threads...
1080          */
1081         if (request->home_server->server) {
1082                 wait_a_bit(request);
1083                 return;
1084         }
1085
1086 #ifdef WITH_TCP
1087         if (request->home_server->proto != IPPROTO_TCP)
1088 #endif
1089                 check_for_zombie_home_server(request);
1090
1091         home = request->home_server;
1092
1093         /*
1094          *      The default as of 2.1.7 is to allow requests to
1095          *      fail-over to a backup home server when this one does
1096          *      not respond.  The old behavior can be configured as
1097          *      well.
1098          */
1099         if (home->no_response_fail) {
1100                 radlog(L_ERR, "Rejecting request %u (proxy Id %d) due to lack of any response from home server %s port %d",
1101                        request->number, request->proxy->id,
1102                        inet_ntop(request->proxy->dst_ipaddr.af,
1103                                  &request->proxy->dst_ipaddr.ipaddr,
1104                                  buffer, sizeof(buffer)),
1105                        request->proxy->dst_port);
1106
1107                 post_proxy_fail_handler(request);
1108         } else {
1109                 /*
1110                  *      Enforce max_request_time.
1111                  *
1112                  *      We fail over to another backup home server
1113                  *      when the client re-transmits the request.  If
1114                  *      the client doesn't re-transmit, no fail-over
1115                  *      occurs.
1116                  */
1117                 rad_assert(request->ev == NULL);
1118                 request->child_state = REQUEST_RUNNING;
1119                 wait_a_bit(request);
1120         }
1121
1122         /*
1123          *      Don't touch request due to race conditions
1124          */
1125
1126 #ifdef WITH_TCP
1127         /*
1128          *      Do nothing more.  The home server didn't respond,
1129          *      but that isn't a catastrophic failure.  Some home
1130          *      servers don't respond to packets...
1131          */
1132         if (home->proto == IPPROTO_TCP) {
1133                 /*
1134                  *      FIXME: Set up TCP pinging on this connection.
1135                  *
1136                  *      Maybe the CONNECTION is dead, but the home
1137                  *      server is alive.  In that case, we need to start
1138                  *      pinging on the connection.
1139                  *
1140                  *      This means doing the pinging BEFORE the
1141                  *      post_proxy_fail_handler above, as it may do
1142                  *      something with the request, and cause the
1143                  *      proxy listener to go away!
1144                  */
1145                 return;
1146         }
1147 #endif
1148
1149         if (home->state == HOME_STATE_IS_DEAD) {
1150                 rad_assert(home->ev != NULL); /* or it will never wake up */
1151                 return;
1152         }
1153
1154         /*
1155          *      Enable the zombie period when we notice that the home
1156          *      server hasn't responded.  We do NOT back-date the start
1157          *      of the zombie period.
1158          */
1159         if (home->state == HOME_STATE_ALIVE) {
1160                 home->state = HOME_STATE_ZOMBIE;
1161                 home->zombie_period_start = now;
1162                 fr_event_delete(el, &home->ev);
1163                 home->currently_outstanding = 0;
1164                 home->num_received_pings = 0;
1165
1166                 radlog(L_PROXY, "Marking home server %s port %d as zombie (it looks like it is dead).",
1167                        inet_ntop(home->ipaddr.af, &home->ipaddr.ipaddr,
1168                                  buffer, sizeof(buffer)),
1169                        home->port);
1170
1171                 /*
1172                  *      Start pinging the home server.
1173                  */
1174                 ping_home_server(home);
1175         }
1176 }
1177 #endif
1178
1179 static void wait_a_bit(void *ctx)
1180 {
1181         struct timeval when;
1182         REQUEST *request = ctx;
1183         fr_event_callback_t callback = NULL;
1184
1185         rad_assert(request->magic == REQUEST_MAGIC);
1186
1187         /*
1188          *      The socket was closed.  Tell the request that
1189          *      there is no point in continuing.
1190          */
1191         if (request->listener->status != RAD_LISTEN_STATUS_KNOWN) {
1192                 goto stop_processing;
1193         }
1194
1195 #ifdef WITH_COA
1196         /*
1197          *      The CoA request is a new (internally generated)
1198          *      request, created in a child thread.  We therefore need
1199          *      some way to tie its events back into the main event
1200          *      handler.
1201          */
1202         if (request->coa && !request->coa->proxy_reply &&
1203             request->coa->next_callback) {
1204                 request->coa->when = request->coa->next_when;
1205                 INSERT_EVENT(request->coa->next_callback, request->coa);
1206                 request->coa->next_callback = NULL;
1207                 request->coa->parent = NULL;
1208                 request->coa = NULL;
1209         }
1210 #endif
1211
1212         switch (request->child_state) {
1213         case REQUEST_QUEUED:
1214         case REQUEST_RUNNING:
1215                 when = request->received;
1216                 when.tv_sec += request->root->max_request_time;
1217
1218                 /*
1219                  *      Normally called from the event loop with the
1220                  *      proper event loop time.  Otherwise, called from
1221                  *      post proxy fail handler, which sets "now", and
1222                  *      this call won't re-set it, because we're not
1223                  *      in the event loop.
1224                  */
1225                 fr_event_now(el, &now);
1226
1227                 /*
1228                  *      Request still has more time.  Continue
1229                  *      waiting.
1230                  */
1231                 if (timercmp(&now, &when, <) ||
1232                     ((request->listener->type == RAD_LISTEN_DETAIL) &&
1233                      (request->child_state == REQUEST_QUEUED))) {
1234                         if (request->delay < (USEC / 10)) {
1235                                 request->delay = USEC / 10;
1236                         }
1237                         request->delay += request->delay >> 1;
1238
1239 #ifdef WITH_DETAIL
1240                         /*
1241                          *      Cap wait at some sane value for detail
1242                          *      files.
1243                          */
1244                         if ((request->listener->type == RAD_LISTEN_DETAIL) &&
1245                             (request->delay > (request->root->max_request_time * USEC))) {
1246                                 request->delay = request->root->max_request_time * USEC;
1247                         }
1248 #endif
1249
1250                         request->when = now;
1251                         tv_add(&request->when, request->delay);
1252                         callback = wait_a_bit;
1253                         break;
1254                 }
1255
1256 #if defined(HAVE_PTHREAD_H) || defined(WITH_PROXY)
1257                 /*
1258                  *      A child thread MAY still be running on the
1259                  *      request.  Ask the thread to stop working on
1260                  *      the request.
1261                  */
1262                 if (have_children &&
1263                     (pthread_equal(request->child_pid, NO_SUCH_CHILD_PID) == 0)) {
1264                         request->master_state = REQUEST_STOP_PROCESSING;
1265
1266                         radlog(L_ERR, "WARNING: Unresponsive child for request %u, in module %s component %s",
1267                                request->number,
1268                                request->module ? request->module : "<server core>",
1269                                request->component ? request->component : "<server core>");
1270
1271                         request->delay = USEC / 4;
1272                         tv_add(&request->when, request->delay);
1273                         callback = wait_for_child_to_die;
1274                         break;
1275                 }
1276 #endif
1277
1278                 /*
1279                  *      Else no child thread is processing the
1280                  *      request.  We probably should have just marked
1281                  *      the request as 'done' elsewhere, like in the
1282                  *      post-proxy-fail handler.  But doing that would
1283                  *      involve checking for max_request_time in
1284                  *      multiple places, so this may be simplest.
1285                  */
1286                 request->child_state = REQUEST_DONE;
1287                 /* FALL-THROUGH */
1288
1289                 /*
1290                  *      Mark the request as no longer running,
1291                  *      and clean it up.
1292                  */
1293         case REQUEST_DONE:
1294 #ifdef HAVE_PTHREAD_H
1295                 request->child_pid = NO_SUCH_CHILD_PID;
1296 #endif
1297
1298 #ifdef WITH_COA
1299                 /*
1300                  *      This is a CoA request.  It's been divorced
1301                  *      from everything else, so we clean it up now.
1302                  */
1303                 if (!request->in_request_hash &&
1304                     request->proxy &&
1305                     (request->packet->code != request->proxy->code) &&
1306                     ((request->proxy->code == PW_COA_REQUEST) ||
1307                      (request->proxy->code == PW_DISCONNECT_REQUEST))) {
1308                         /*
1309                          *      FIXME: Do CoA MIBs
1310                          */
1311                         ev_request_free(&request);
1312                         return;
1313                 }
1314 #endif
1315                 request_stats_final(request);
1316                 cleanup_delay(request);
1317                 return;
1318
1319         case REQUEST_REJECT_DELAY:
1320         case REQUEST_CLEANUP_DELAY:
1321 #ifdef HAVE_PTHREAD_H
1322                 request->child_pid = NO_SUCH_CHILD_PID;
1323 #endif
1324                 request_stats_final(request);
1325
1326         case REQUEST_PROXIED:
1327                 rad_assert(request->next_callback != NULL);
1328                 rad_assert(request->next_callback != wait_a_bit);
1329
1330                 request->when = request->next_when;
1331                 callback = request->next_callback;
1332                 request->next_callback = NULL;
1333                 break;
1334
1335         default:
1336                 rad_panic("Internal sanity check failure");
1337                 return;
1338         }
1339
1340         /*
1341          *      Something major went wrong.  Discard the request, and
1342          *      keep running.
1343          *
1344          *      FIXME: No idea why this happens or how to fix it...
1345          *      It seems to happen *only* when requests are proxied,
1346          *      and where the home server doesn't respond.  So it looks
1347          *      like a race condition above, but it happens in debug
1348          *      mode, with no threads...
1349          */
1350         if (!callback) {
1351                 RDEBUG("WARNING: Internal sanity check failed in event handler for request %u: Discarding the request!", request->number);
1352                 ev_request_free(&request);
1353                 return;
1354         }
1355
1356         INSERT_EVENT(callback, request);
1357 }
1358
1359 #ifdef WITH_COA
1360 static void no_response_to_coa_request(void *ctx)
1361 {
1362         REQUEST *request = ctx;
1363         char buffer[128];
1364
1365         rad_assert(request->magic == REQUEST_MAGIC);
1366         rad_assert(request->child_state == REQUEST_PROXIED);
1367         rad_assert(request->home_server != NULL);
1368         rad_assert(!request->in_request_hash);
1369
1370         radlog(L_ERR, "No response to CoA request sent to %s",
1371                inet_ntop(request->proxy->dst_ipaddr.af,
1372                          &request->proxy->dst_ipaddr.ipaddr,
1373                          buffer, sizeof(buffer)));
1374
1375         /*
1376          *      Hack.
1377          */
1378         request->packet->code |= (PW_COA_REQUEST << 8);
1379         post_proxy_fail_handler(request);
1380 }
1381
1382
1383 static int update_event_timestamp(RADIUS_PACKET *packet, time_t when)
1384 {
1385         VALUE_PAIR *vp;
1386
1387         vp = pairfind(packet->vps, PW_EVENT_TIMESTAMP);
1388         if (!vp) return 0;
1389
1390         vp->vp_date = when;
1391
1392         if (packet->data) {
1393                 free(packet->data);
1394                 packet->data = NULL;
1395                 packet->data_len = 0;
1396         }
1397
1398         return 1;               /* time stamp updated */
1399 }
1400
1401
1402 /*
1403  *      Called when we haven't received a response to a CoA request.
1404  */
1405 static void retransmit_coa_request(void *ctx)
1406 {
1407         int delay, frac;
1408         struct timeval mrd;
1409         REQUEST *request = ctx;
1410
1411         rad_assert(request->magic == REQUEST_MAGIC);
1412         rad_assert(request->child_state == REQUEST_PROXIED);
1413         rad_assert(request->home_server != NULL);
1414         rad_assert(!request->in_request_hash);
1415         rad_assert(request->parent == NULL);
1416
1417         fr_event_now(el, &now);
1418
1419         /*
1420          *      Cap count at MRC, if it is non-zero.
1421          */
1422         if (request->home_server->coa_mrc &&
1423             (request->num_coa_requests >= request->home_server->coa_mrc)) {
1424                 no_response_to_coa_request(request);
1425                 return;
1426         }
1427
1428         /*
1429          *      RFC 5080 Section 2.2.1
1430          *
1431          *      RT = 2*RTprev + RAND*RTprev
1432          *         = 1.9 * RTprev + rand(0,.2) * RTprev
1433          *         = 1.9 * RTprev + rand(0,1) * (RTprev / 5)
1434          */
1435         delay = fr_rand();
1436         delay ^= (delay >> 16);
1437         delay &= 0xffff;
1438         frac = request->delay / 5;
1439         delay = ((frac >> 16) * delay) + (((frac & 0xffff) * delay) >> 16);
1440
1441         delay += (2 * request->delay) - (request->delay / 10);
1442
1443         /*
1444          *      Cap delay at MRT, if MRT is non-zero.
1445          */
1446         if (request->home_server->coa_mrt &&
1447             (delay > (request->home_server->coa_mrt * USEC))) {
1448                 int mrt_usec = request->home_server->coa_mrt * USEC;
1449
1450                 /*
1451                  *      delay = MRT + RAND * MRT
1452                  *            = 0.9 MRT + rand(0,.2)  * MRT
1453                  */
1454                 delay = fr_rand();
1455                 delay ^= (delay >> 15);
1456                 delay &= 0x1ffff;
1457                 delay = ((mrt_usec >> 16) * delay) + (((mrt_usec & 0xffff) * delay) >> 16);
1458                 delay += mrt_usec - (mrt_usec / 10);
1459         }
1460
1461         request->delay = delay;
1462         request->when = now;
1463         tv_add(&request->when, request->delay);
1464         mrd = request->proxy_when;
1465         mrd.tv_sec += request->home_server->coa_mrd;
1466
1467         /*
1468          *      Cap duration at MRD.
1469          */
1470         if (timercmp(&mrd, &request->when, <)) {
1471                 request->when = mrd;
1472                 INSERT_EVENT(no_response_to_coa_request, request);
1473
1474         } else {
1475                 INSERT_EVENT(retransmit_coa_request, request);
1476         }
1477
1478         if (update_event_timestamp(request->proxy, now.tv_sec)) {
1479                 /*
1480                  *      Keep a copy of the old Id so that the
1481                  *      re-transmitted request doesn't re-use the old
1482                  *      Id.
1483                  */
1484                 RADIUS_PACKET old = *request->proxy;
1485
1486                 /*
1487                  *      Don't free the old Id on error.
1488                  */
1489                 if (!insert_into_proxy_hash(request)) {
1490                         radlog(L_PROXY,"Failed re-inserting CoA request into proxy hash.");
1491                         return;
1492                 }
1493
1494                 /*
1495                  *      Now that we have a new Id, free the old one.
1496                  */
1497                 PTHREAD_MUTEX_LOCK(&proxy_mutex);
1498                 fr_packet_list_yank(proxy_list, &old);
1499                 fr_packet_list_id_free(proxy_list, &old);
1500                 PTHREAD_MUTEX_UNLOCK(&proxy_mutex);
1501
1502                 request->num_proxied_requests = 0;
1503                 request->num_proxied_responses = 0;
1504         }
1505
1506         request->num_proxied_requests++;
1507         request->num_coa_requests++; /* is NOT reset by code 3 lines above! */
1508
1509         request->proxy_listener->send(request->proxy_listener,
1510                                       request);
1511 }
1512
1513
1514 /*
1515  *      The original request is either DONE, or in CLEANUP_DELAY.
1516  */
1517 static int originated_coa_request(REQUEST *request)
1518 {
1519         int delay, rcode, pre_proxy_type = 0;
1520         VALUE_PAIR *vp;
1521         REQUEST *coa;
1522         fr_ipaddr_t ipaddr;
1523         char buffer[256];
1524
1525         rad_assert(request->proxy == NULL);
1526         rad_assert(!request->in_proxy_hash);
1527         rad_assert(request->proxy_reply == NULL);
1528
1529         /*
1530          *      Check whether we want to originate one, or cancel one.
1531          */
1532         vp = pairfind(request->config_items, PW_SEND_COA_REQUEST);
1533         if (!vp && request->coa) {
1534                 vp = pairfind(request->coa->proxy->vps, PW_SEND_COA_REQUEST);
1535         }
1536
1537         if (vp) {
1538                 if (vp->vp_integer == 0) {
1539                         ev_request_free(&request->coa);
1540                         return 1;       /* success */
1541                 }
1542         }
1543
1544         if (!request->coa) request_alloc_coa(request);
1545         if (!request->coa) return 0;
1546
1547         coa = request->coa;
1548
1549         /*
1550          *      src_ipaddr will be set up in proxy_encode.
1551          */
1552         memset(&ipaddr, 0, sizeof(ipaddr));
1553         vp = pairfind(coa->proxy->vps, PW_PACKET_DST_IP_ADDRESS);
1554         if (vp) {
1555                 ipaddr.af = AF_INET;
1556                 ipaddr.ipaddr.ip4addr.s_addr = vp->vp_ipaddr;
1557
1558         } else if ((vp = pairfind(coa->proxy->vps,
1559                                   PW_PACKET_DST_IPV6_ADDRESS)) != NULL) {
1560                 ipaddr.af = AF_INET6;
1561                 ipaddr.ipaddr.ip6addr = vp->vp_ipv6addr;
1562
1563         } else if ((vp = pairfind(coa->proxy->vps,
1564                                   PW_HOME_SERVER_POOL)) != NULL) {
1565                 coa->home_pool = home_pool_byname(vp->vp_strvalue,
1566                                                   HOME_TYPE_COA);
1567                 if (!coa->home_pool) {
1568                         RDEBUG2("WARNING: No such home_server_pool %s",
1569                                vp->vp_strvalue);
1570         fail:
1571                         ev_request_free(&request->coa);
1572                         return 0;
1573                 }
1574
1575                 /*
1576                  *      Prefer
1577                  */
1578         } else if (request->client->coa_pool) {
1579                 coa->home_pool = request->client->coa_pool;
1580
1581         } else if (request->client->coa_server) {
1582                 coa->home_server = request->client->coa_server;
1583
1584         } else {
1585                 /*
1586                  *      If all else fails, send it to the client that
1587                  *      originated this request.
1588                  */
1589                 memcpy(&ipaddr, &request->packet->src_ipaddr, sizeof(ipaddr));
1590         }
1591
1592         /*
1593          *      Use the pool, if it exists.
1594          */
1595         if (coa->home_pool) {
1596                 coa->home_server = home_server_ldb(NULL, coa->home_pool, coa);
1597                 if (!coa->home_server) {
1598                         RDEBUG("WARNING: No live home server for home_server_pool %s", vp->vp_strvalue);
1599                         goto fail;
1600                 }
1601
1602         } else if (!coa->home_server) {
1603                 int port = PW_COA_UDP_PORT;
1604
1605                 vp = pairfind(coa->proxy->vps, PW_PACKET_DST_PORT);
1606                 if (vp) port = vp->vp_integer;
1607
1608                 coa->home_server = home_server_find(&ipaddr, port, IPPROTO_UDP);
1609                 if (!coa->home_server) {
1610                         RDEBUG2("WARNING: Unknown destination %s:%d for CoA request.",
1611                                inet_ntop(ipaddr.af, &ipaddr.ipaddr,
1612                                          buffer, sizeof(buffer)), port);
1613                         goto fail;
1614                 }
1615         }
1616
1617         vp = pairfind(coa->proxy->vps, PW_PACKET_TYPE);
1618         if (vp) {
1619                 switch (vp->vp_integer) {
1620                 case PW_COA_REQUEST:
1621                 case PW_DISCONNECT_REQUEST:
1622                         coa->proxy->code = vp->vp_integer;
1623                         break;
1624
1625                 default:
1626                         DEBUG("Cannot set CoA Packet-Type to code %d",
1627                               vp->vp_integer);
1628                         goto fail;
1629                 }
1630         }
1631
1632         if (!coa->proxy->code) coa->proxy->code = PW_COA_REQUEST;
1633
1634         /*
1635          *      The rest of the server code assumes that
1636          *      request->packet && request->reply exist.  Copy them
1637          *      from the original request.
1638          */
1639         rad_assert(coa->packet != NULL);
1640         rad_assert(coa->packet->vps == NULL);
1641         memcpy(coa->packet, request->packet, sizeof(*request->packet));
1642         coa->packet->vps = paircopy(request->packet->vps);
1643         coa->packet->data = NULL;
1644         rad_assert(coa->reply != NULL);
1645         rad_assert(coa->reply->vps == NULL);
1646         memcpy(coa->reply, request->reply, sizeof(*request->reply));
1647         coa->reply->vps = paircopy(request->reply->vps);
1648         coa->reply->data = NULL;
1649         coa->config_items = paircopy(request->config_items);
1650
1651         /*
1652          *      Call the pre-proxy routines.
1653          */
1654         vp = pairfind(request->config_items, PW_PRE_PROXY_TYPE);
1655         if (vp) {
1656                 RDEBUG2("  Found Pre-Proxy-Type %s", vp->vp_strvalue);
1657                 pre_proxy_type = vp->vp_integer;
1658         }
1659
1660         if (coa->home_pool && coa->home_pool->virtual_server) {
1661                 const char *old_server = coa->server;
1662
1663                 coa->server = coa->home_pool->virtual_server;
1664                 RDEBUG2(" server %s {", coa->server);
1665                 rcode = module_pre_proxy(pre_proxy_type, coa);
1666                 RDEBUG2(" }");
1667                 coa->server = old_server;
1668         } else {
1669                 rcode = module_pre_proxy(pre_proxy_type, coa);
1670         }
1671         switch (rcode) {
1672         default:
1673                 goto fail;
1674
1675         /*
1676          *      Only send the CoA packet if the pre-proxy code succeeded.
1677          */
1678         case RLM_MODULE_NOOP:
1679         case RLM_MODULE_OK:
1680         case RLM_MODULE_UPDATED:
1681                 break;
1682         }
1683
1684         /*
1685          *      Source IP / port is set when the proxy socket
1686          *      is chosen.
1687          */
1688         coa->proxy->dst_ipaddr = coa->home_server->ipaddr;
1689         coa->proxy->dst_port = coa->home_server->port;
1690
1691         if (!insert_into_proxy_hash(coa)) {
1692                 radlog(L_PROXY, "Failed inserting CoA request into proxy hash.");
1693                 goto fail;
1694         }
1695
1696         /*
1697          *      We CANNOT divorce the CoA request from the parent
1698          *      request.  This function is running in a child thread,
1699          *      and we need access to the main event loop in order to
1700          *      to add the timers for the CoA packet.  See
1701          *      wait_a_bit().
1702          */
1703
1704         /*
1705          *      Forget about the original request completely at this
1706          *      point.
1707          */
1708         request = coa;
1709
1710         gettimeofday(&request->proxy_when, NULL);
1711         request->received = request->next_when = request->proxy_when;
1712         rad_assert(request->proxy_reply == NULL);
1713
1714         /*
1715          *      Implement re-transmit algorithm as per RFC 5080
1716          *      Section 2.2.1.
1717          *
1718          *      We want IRT + RAND*IRT
1719          *      or 0.9 IRT + rand(0,.2) IRT
1720          *
1721          *      2^20 ~ USEC, and we want 2.
1722          *      rand(0,0.2) USEC ~ (rand(0,2^21) / 10)
1723          */
1724         delay = (fr_rand() & ((1 << 22) - 1)) / 10;
1725         request->delay = delay * request->home_server->coa_irt;
1726         delay = request->home_server->coa_irt * USEC;
1727         delay -= delay / 10;
1728         delay += request->delay;
1729
1730         request->delay = delay;
1731         tv_add(&request->next_when, delay);
1732         request->next_callback = retransmit_coa_request;
1733
1734         /*
1735          *      Note that we set proxied BEFORE sending the packet.
1736          *
1737          *      Once we send it, the request is tainted, as
1738          *      another thread may have picked it up.  Don't
1739          *      touch it!
1740          */
1741         request->num_proxied_requests = 1;
1742         request->num_proxied_responses = 0;
1743         request->child_pid = NO_SUCH_CHILD_PID;
1744
1745         update_event_timestamp(request->proxy, request->proxy_when.tv_sec);
1746
1747         request->child_state = REQUEST_PROXIED;
1748
1749         DEBUG_PACKET(request, request->proxy, 1);
1750
1751         request->proxy_listener->send(request->proxy_listener,
1752                                       request);
1753         return 1;
1754 }
1755 #endif  /* WITH_COA */
1756
1757 #ifdef WITH_PROXY
1758 static int process_proxy_reply(REQUEST *request)
1759 {
1760         int rcode;
1761         int post_proxy_type = 0;
1762         VALUE_PAIR *vp;
1763
1764         /*
1765          *      Delete any reply we had accumulated until now.
1766          */
1767         pairfree(&request->reply->vps);
1768
1769         /*
1770          *      Run the packet through the post-proxy stage,
1771          *      BEFORE playing games with the attributes.
1772          */
1773         vp = pairfind(request->config_items, PW_POST_PROXY_TYPE);
1774         if (vp) {
1775                 RDEBUG2("  Found Post-Proxy-Type %s", vp->vp_strvalue);
1776                 post_proxy_type = vp->vp_integer;
1777         }
1778
1779         if (request->home_pool && request->home_pool->virtual_server) {
1780                 const char *old_server = request->server;
1781
1782                 request->server = request->home_pool->virtual_server;
1783                 RDEBUG2(" server %s {", request->server);
1784                 rcode = module_post_proxy(post_proxy_type, request);
1785                 RDEBUG2(" }");
1786                 request->server = old_server;
1787         } else {
1788                 rcode = module_post_proxy(post_proxy_type, request);
1789         }
1790
1791 #ifdef WITH_COA
1792         if (request->packet->code == request->proxy->code)
1793           /*
1794            *    Don't run the next bit if we originated a CoA
1795            *    packet, after receiving an Access-Request or
1796            *    Accounting-Request.
1797            */
1798 #endif
1799
1800         /*
1801          *      There may NOT be a proxy reply, as we may be
1802          *      running Post-Proxy-Type = Fail.
1803          */
1804         if (request->proxy_reply) {
1805                 /*
1806                  *      Delete the Proxy-State Attributes from
1807                  *      the reply.  These include Proxy-State
1808                  *      attributes from us and remote server.
1809                  */
1810                 pairdelete(&request->proxy_reply->vps, PW_PROXY_STATE);
1811
1812                 /*
1813                  *      Add the attributes left in the proxy
1814                  *      reply to the reply list.
1815                  */
1816                 pairadd(&request->reply->vps, request->proxy_reply->vps);
1817                 request->proxy_reply->vps = NULL;
1818
1819                 /*
1820                  *      Free proxy request pairs.
1821                  */
1822                 pairfree(&request->proxy->vps);
1823         }
1824
1825         switch (rcode) {
1826         default:  /* Don't do anything */
1827                 break;
1828         case RLM_MODULE_FAIL:
1829                 /* FIXME: debug print stuff */
1830                 request->child_state = REQUEST_DONE;
1831                 return 0;
1832
1833         case RLM_MODULE_HANDLED:
1834                 /* FIXME: debug print stuff */
1835                 request->child_state = REQUEST_DONE;
1836                 return 0;
1837         }
1838
1839         return 1;
1840 }
1841 #endif
1842
1843 static int request_pre_handler(REQUEST *request)
1844 {
1845         int rcode;
1846
1847         rad_assert(request->magic == REQUEST_MAGIC);
1848         rad_assert(request->packet != NULL);
1849
1850         request->child_state = REQUEST_RUNNING;
1851
1852         /*
1853          *      Don't decode the packet if it's an internal "fake"
1854          *      request.  Instead, just return so that the caller can
1855          *      process it.
1856          */
1857         if (request->packet->dst_port == 0) {
1858                 request->username = pairfind(request->packet->vps,
1859                                              PW_USER_NAME);
1860                 request->password = pairfind(request->packet->vps,
1861                                              PW_USER_PASSWORD);
1862                 return 1;
1863         }
1864
1865 #ifdef WITH_PROXY
1866         /*
1867          *      Put the decoded packet into it's proper place.
1868          */
1869         if (request->proxy_reply != NULL) {
1870                 /*
1871                  *      FIXME: For now, we can only proxy RADIUS packets.
1872                  *
1873                  *      In order to proxy other packets, we need to
1874                  *      somehow cache the "decode" function.
1875                  */
1876                 rcode = rad_decode(request->proxy_reply, request->proxy,
1877                                    request->home_server->secret);
1878                 DEBUG_PACKET(request, request->proxy_reply, 0);
1879         } else
1880 #endif
1881         if (request->packet->vps == NULL) {
1882                 rcode = request->listener->decode(request->listener, request);
1883
1884                 if (debug_condition) {
1885                         int result = FALSE;
1886                         const char *my_debug = debug_condition;
1887
1888                         /*
1889                          *      Ignore parse errors.
1890                          */
1891                         radius_evaluate_condition(request, RLM_MODULE_OK, 0,
1892                                                   &my_debug, 1,
1893                                                   &result);
1894                         if (result) {
1895                                 request->options = 2;
1896                                 request->radlog = radlog_request;
1897                         }
1898                 }
1899
1900                 DEBUG_PACKET(request, request->packet, 0);
1901         } else {
1902                 rcode = 0;
1903         }
1904
1905         if (rcode < 0) {
1906                 RDEBUG("%s Dropping packet without response.", fr_strerror());
1907                 request->reply->offset = -2; /* bad authenticator */
1908                 request->child_state = REQUEST_DONE;
1909                 return 0;
1910         }
1911
1912         if (!request->username) {
1913                 request->username = pairfind(request->packet->vps,
1914                                              PW_USER_NAME);
1915         }
1916
1917 #ifdef WITH_PROXY
1918         if (request->proxy) {
1919                 return process_proxy_reply(request);
1920 #endif
1921         }
1922
1923         return 1;
1924 }
1925
1926
1927 #ifdef WITH_PROXY
1928 /*
1929  *      Do state handling when we proxy a request.
1930  */
1931 static int proxy_request(REQUEST *request)
1932 {
1933         struct timeval when;
1934         char buffer[128];
1935
1936 #ifdef WITH_COA
1937         if (request->coa) {
1938                 RDEBUG("WARNING: Cannot proxy and originate CoA packets at the same time.  Cancelling CoA request");
1939                 ev_request_free(&request->coa);
1940         }
1941 #endif
1942
1943         if (request->home_server->server) {
1944                 RDEBUG("ERROR: Cannot perform real proxying to a virtual server.");
1945                 return 0;
1946         }
1947
1948         if (!insert_into_proxy_hash(request)) {
1949                 radlog(L_PROXY, "Failed inserting request into proxy hash.");
1950                 return 0;
1951         }
1952
1953         request->proxy_listener->encode(request->proxy_listener, request);
1954
1955         when = request->received;
1956         when.tv_sec += request->root->max_request_time;
1957
1958         gettimeofday(&request->proxy_when, NULL);
1959
1960         request->next_when = request->proxy_when;
1961         request->next_when.tv_sec += request->home_server->response_window;
1962
1963         rad_assert(request->home_server->response_window > 0);
1964
1965         if (timercmp(&when, &request->next_when, <)) {
1966                 request->next_when = when;
1967         }
1968         request->next_callback = no_response_to_proxied_request;
1969
1970         RDEBUG2("Proxying request %u to home server %s port %d",
1971                request->number,
1972                inet_ntop(request->proxy->dst_ipaddr.af,
1973                          &request->proxy->dst_ipaddr.ipaddr,
1974                          buffer, sizeof(buffer)),
1975                 request->proxy->dst_port);
1976
1977         /*
1978          *      Note that we set proxied BEFORE sending the packet.
1979          *
1980          *      Once we send it, the request is tainted, as
1981          *      another thread may have picked it up.  Don't
1982          *      touch it!
1983          */
1984         request->num_proxied_requests = 1;
1985         request->num_proxied_responses = 0;
1986 #ifdef HAVE_PTHREAD_H
1987         request->child_pid = NO_SUCH_CHILD_PID;
1988 #endif
1989         request->child_state = REQUEST_PROXIED;
1990
1991         DEBUG_PACKET(request, request->proxy, 1);
1992
1993         request->proxy_listener->send(request->proxy_listener,
1994                                       request);
1995         return 1;
1996 }
1997
1998
1999 /*
2000  *      "Proxy" the request by sending it to a new virtual server.
2001  */
2002 static int proxy_to_virtual_server(REQUEST *request)
2003 {
2004         REQUEST *fake;
2005         RAD_REQUEST_FUNP fun;
2006
2007         if (!request->home_server || !request->home_server->server) return 0;
2008
2009         if (request->parent) {
2010                 RDEBUG2("WARNING: Cancelling proxy request to virtual server %s as this request was itself proxied.", request->home_server->server);
2011                 return 0;
2012         }
2013
2014         fake = request_alloc_fake(request);
2015         if (!fake) {
2016                 RDEBUG2("WARNING: Out of memory");
2017                 return 0;
2018         }
2019
2020         fake->packet->vps = paircopy(request->proxy->vps);
2021         fake->server = request->home_server->server;
2022
2023         if (request->proxy->code == PW_AUTHENTICATION_REQUEST) {
2024                 fun = rad_authenticate;
2025
2026 #ifdef WITH_ACCOUNTING
2027         } else if (request->proxy->code == PW_ACCOUNTING_REQUEST) {
2028                 fun = rad_accounting;
2029 #endif
2030
2031         } else {
2032                 RDEBUG2("Unknown packet type %d", request->proxy->code);
2033                 ev_request_free(&fake);
2034                 return 0;
2035         }
2036
2037         RDEBUG2(">>> Sending proxied request internally to virtual server.");
2038         radius_handle_request(fake, fun);
2039         RDEBUG2("<<< Received proxied response code %d from internal virtual server.", fake->reply->code);
2040
2041         if (fake->reply->code != 0) {
2042                 request->proxy_reply = fake->reply;
2043                 fake->reply = NULL;
2044         } else {
2045                 /*
2046                  *      There was no response
2047                  */
2048                 setup_post_proxy_fail(request);
2049         }
2050
2051         ev_request_free(&fake);
2052
2053         process_proxy_reply(request);
2054
2055         /*
2056          *      Process it through the normal section again, but ONLY
2057          *      if we received a proxy reply..
2058          */
2059         if (request->proxy_reply) {
2060                 if (request->server) RDEBUG("server %s {",
2061                                             request->server != NULL ?
2062                                             request->server : "");
2063                 fun(request);
2064
2065                 if (request->server) RDEBUG("} # server %s",
2066                                             request->server != NULL ?
2067                                             request->server : "");
2068         }
2069
2070         return 2;               /* success, but NOT '1' !*/
2071 }
2072
2073 /*
2074  *      Return 1 if we did proxy it, or the proxy attempt failed
2075  *      completely.  Either way, the caller doesn't touch the request
2076  *      any more if we return 1.
2077  */
2078 static int successfully_proxied_request(REQUEST *request)
2079 {
2080         int rcode;
2081         int pre_proxy_type = 0;
2082         VALUE_PAIR *realmpair;
2083         VALUE_PAIR *strippedname;
2084         VALUE_PAIR *vp;
2085         char *realmname = NULL;
2086         home_server *home;
2087         REALM *realm = NULL;
2088         home_pool_t *pool;
2089
2090         /*
2091          *      If it was already proxied, do nothing.
2092          *
2093          *      FIXME: This should really be a serious error.
2094          */
2095         if (request->in_proxy_hash ||
2096             (request->proxy_reply && (request->proxy_reply->code != 0))) {
2097                 return 0;
2098         }
2099
2100         realmpair = pairfind(request->config_items, PW_PROXY_TO_REALM);
2101         if (!realmpair || (realmpair->length == 0)) {
2102                 int pool_type;
2103
2104                 vp = pairfind(request->config_items, PW_HOME_SERVER_POOL);
2105                 if (!vp) return 0;
2106
2107                 switch (request->packet->code) {
2108                 case PW_AUTHENTICATION_REQUEST:
2109                         pool_type = HOME_TYPE_AUTH;
2110                         break;
2111
2112 #ifdef WITH_ACCOUNTING
2113                 case PW_ACCOUNTING_REQUEST:
2114                         pool_type = HOME_TYPE_ACCT;
2115                         break;
2116 #endif
2117
2118 #ifdef WITH_COA
2119                 case PW_COA_REQUEST:
2120                 case PW_DISCONNECT_REQUEST:
2121                         pool_type = HOME_TYPE_COA;
2122                         break;
2123 #endif
2124
2125                 default:
2126                         return 0;
2127                 }
2128
2129                 pool = home_pool_byname(vp->vp_strvalue, pool_type);
2130                 if (!pool) {
2131                         RDEBUG2("ERROR: Cannot proxy to unknown pool %s",
2132                                 vp->vp_strvalue);
2133                         return 0;
2134                 }
2135
2136                 realmname = NULL; /* no realms */
2137                 realm = NULL;
2138                 goto found_pool;
2139         }
2140
2141         realmname = (char *) realmpair->vp_strvalue;
2142
2143         realm = realm_find2(realmname);
2144         if (!realm) {
2145                 RDEBUG2("ERROR: Cannot proxy to unknown realm %s", realmname);
2146                 return 0;
2147         }
2148
2149         /*
2150          *      Figure out which pool to use.
2151          */
2152         if (request->packet->code == PW_AUTHENTICATION_REQUEST) {
2153                 pool = realm->auth_pool;
2154
2155 #ifdef WITH_ACCOUNTING
2156         } else if (request->packet->code == PW_ACCOUNTING_REQUEST) {
2157                 pool = realm->acct_pool;
2158 #endif
2159
2160 #ifdef WITH_COA
2161         } else if ((request->packet->code == PW_COA_REQUEST) ||
2162                    (request->packet->code == PW_DISCONNECT_REQUEST)) {
2163                 pool = realm->acct_pool;
2164 #endif
2165
2166         } else {
2167                 rad_panic("Internal sanity check failed");
2168         }
2169
2170         if (!pool) {
2171                 RDEBUG2(" WARNING: Cancelling proxy to Realm %s, as the realm is local.",
2172                        realmname);
2173                 return 0;
2174         }
2175
2176 found_pool:
2177         home = home_server_ldb(realmname, pool, request);
2178         if (!home) {
2179                 RDEBUG2("ERROR: Failed to find live home server for realm %s",
2180                        realmname);
2181                 return -1;
2182         }
2183         request->home_pool = pool;
2184
2185 #ifdef WITH_COA
2186         /*
2187          *      Once we've decided to proxy a request, we cannot send
2188          *      a CoA packet.  So we free up any CoA packet here.
2189          */
2190         ev_request_free(&request->coa);
2191 #endif
2192         /*
2193          *      Remember that we sent the request to a Realm.
2194          */
2195         if (realmname) pairadd(&request->packet->vps,
2196                                pairmake("Realm", realmname, T_OP_EQ));
2197
2198         /*
2199          *      Strip the name, if told to.
2200          *
2201          *      Doing it here catches the case of proxied tunneled
2202          *      requests.
2203          */
2204         if (realm && (realm->striprealm == TRUE) &&
2205            (strippedname = pairfind(request->proxy->vps, PW_STRIPPED_USER_NAME)) != NULL) {
2206                 /*
2207                  *      If there's a Stripped-User-Name attribute in
2208                  *      the request, then use THAT as the User-Name
2209                  *      for the proxied request, instead of the
2210                  *      original name.
2211                  *
2212                  *      This is done by making a copy of the
2213                  *      Stripped-User-Name attribute, turning it into
2214                  *      a User-Name attribute, deleting the
2215                  *      Stripped-User-Name and User-Name attributes
2216                  *      from the vps list, and making the new
2217                  *      User-Name the head of the vps list.
2218                  */
2219                 vp = pairfind(request->proxy->vps, PW_USER_NAME);
2220                 if (!vp) {
2221                         vp = radius_paircreate(request, NULL,
2222                                                PW_USER_NAME, PW_TYPE_STRING);
2223                         rad_assert(vp != NULL); /* handled by above function */
2224                         /* Insert at the START of the list */
2225                         vp->next = request->proxy->vps;
2226                         request->proxy->vps = vp;
2227                 }
2228                 memcpy(vp->vp_strvalue, strippedname->vp_strvalue,
2229                        sizeof(vp->vp_strvalue));
2230                 vp->length = strippedname->length;
2231
2232                 /*
2233                  *      Do NOT delete Stripped-User-Name.
2234                  */
2235         }
2236
2237         /*
2238          *      If there is no PW_CHAP_CHALLENGE attribute but
2239          *      there is a PW_CHAP_PASSWORD we need to add it
2240          *      since we can't use the request authenticator
2241          *      anymore - we changed it.
2242          */
2243         if ((request->packet->code == PW_AUTHENTICATION_REQUEST) &&
2244             pairfind(request->proxy->vps, PW_CHAP_PASSWORD) &&
2245             pairfind(request->proxy->vps, PW_CHAP_CHALLENGE) == NULL) {
2246                 vp = radius_paircreate(request, &request->proxy->vps,
2247                                        PW_CHAP_CHALLENGE, PW_TYPE_OCTETS);
2248                 vp->length = AUTH_VECTOR_LEN;
2249                 memcpy(vp->vp_strvalue, request->packet->vector, AUTH_VECTOR_LEN);
2250         }
2251
2252         /*
2253          *      The RFC's say we have to do this, but FreeRADIUS
2254          *      doesn't need it.
2255          */
2256         vp = radius_paircreate(request, &request->proxy->vps,
2257                                PW_PROXY_STATE, PW_TYPE_OCTETS);
2258         snprintf(vp->vp_strvalue, sizeof(vp->vp_strvalue), "%d",
2259                  request->packet->id);
2260         vp->length = strlen(vp->vp_strvalue);
2261
2262         /*
2263          *      Should be done BEFORE inserting into proxy hash, as
2264          *      pre-proxy may use this information, or change it.
2265          */
2266         request->proxy->code = request->packet->code;
2267
2268         /*
2269          *      Call the pre-proxy routines.
2270          */
2271         vp = pairfind(request->config_items, PW_PRE_PROXY_TYPE);
2272         if (vp) {
2273                 RDEBUG2("  Found Pre-Proxy-Type %s", vp->vp_strvalue);
2274                 pre_proxy_type = vp->vp_integer;
2275         }
2276
2277         rad_assert(request->home_pool != NULL);
2278
2279         if (request->home_pool->virtual_server) {
2280                 const char *old_server = request->server;
2281
2282                 request->server = request->home_pool->virtual_server;
2283                 RDEBUG2(" server %s {", request->server);
2284                 rcode = module_pre_proxy(pre_proxy_type, request);
2285                 RDEBUG2(" }");
2286                         request->server = old_server;
2287         } else {
2288                 rcode = module_pre_proxy(pre_proxy_type, request);
2289         }
2290         switch (rcode) {
2291         case RLM_MODULE_FAIL:
2292         case RLM_MODULE_INVALID:
2293         case RLM_MODULE_NOTFOUND:
2294         case RLM_MODULE_USERLOCK:
2295         default:
2296                 /* FIXME: debug print failed stuff */
2297                 return -1;
2298
2299         case RLM_MODULE_REJECT:
2300         case RLM_MODULE_HANDLED:
2301                 return 0;
2302
2303         /*
2304          *      Only proxy the packet if the pre-proxy code succeeded.
2305          */
2306         case RLM_MODULE_NOOP:
2307         case RLM_MODULE_OK:
2308         case RLM_MODULE_UPDATED:
2309                 break;
2310         }
2311
2312         /*
2313          *      If it's a fake request, don't send the proxy
2314          *      packet.  The outer tunnel session will take
2315          *      care of doing that.
2316          */
2317         if (request->packet->dst_port == 0) {
2318                 request->home_server = NULL;
2319                 return 1;
2320         }
2321
2322         if (request->home_server->server) {
2323                 return proxy_to_virtual_server(request);
2324         }
2325
2326         if (!proxy_request(request)) {
2327                 RDEBUG("ERROR: Failed to proxy request %u", request->number);
2328                 return -1;
2329         }
2330
2331         return 1;
2332 }
2333 #endif
2334
2335 static void request_post_handler(REQUEST *request)
2336 {
2337         int child_state = -1;
2338         struct timeval when;
2339         VALUE_PAIR *vp;
2340
2341         if ((request->master_state == REQUEST_STOP_PROCESSING) ||
2342             (request->parent &&
2343              (request->parent->master_state == REQUEST_STOP_PROCESSING))) {
2344                 RDEBUG2("request %u was cancelled.", request->number);
2345 #ifdef HAVE_PTHREAD_H
2346                 request->child_pid = NO_SUCH_CHILD_PID;
2347 #endif
2348                 child_state = REQUEST_DONE;
2349                 goto cleanup;
2350         }
2351
2352         if (request->child_state != REQUEST_RUNNING) {
2353                 rad_panic("Internal sanity check failed");
2354         }
2355
2356 #ifdef WITH_COA
2357         /*
2358          *      If it's not in the request hash, it's a CoA request.
2359          *      We hope.
2360          */
2361         if (!request->in_request_hash &&
2362             request->proxy &&
2363             ((request->proxy->code == PW_COA_REQUEST) ||
2364              (request->proxy->code == PW_DISCONNECT_REQUEST))) {
2365                 request->next_callback = NULL;
2366                 child_state = REQUEST_DONE;
2367                 goto cleanup;
2368         }
2369 #endif
2370
2371         /*
2372          *      Catch Auth-Type := Reject BEFORE proxying the packet.
2373          */
2374         if ((request->packet->code == PW_AUTHENTICATION_REQUEST) &&
2375             (request->reply->code == 0) &&
2376             ((vp = pairfind(request->config_items, PW_AUTH_TYPE)) != NULL) &&
2377             (vp->vp_integer == PW_AUTHTYPE_REJECT)) {
2378                 request->reply->code = PW_AUTHENTICATION_REJECT;
2379         }
2380
2381 #ifdef WITH_PROXY
2382         if (request->root->proxy_requests &&
2383             !request->in_proxy_hash &&
2384             (request->reply->code == 0) &&
2385             (request->packet->dst_port != 0) &&
2386             (request->packet->code != PW_STATUS_SERVER)) {
2387                 int rcode = successfully_proxied_request(request);
2388
2389                 if (rcode == 1) return; /* request is invalid */
2390
2391                 /*
2392                  *      Failed proxying it (dead home servers, etc.)
2393                  *      Run it through Post-Proxy-Type = Fail, and
2394                  *      respond to the request.
2395                  *
2396                  *      Note that we're in a child thread here, so we
2397                  *      do NOT re-schedule the request.  Instead, we
2398                  *      do what we would have done, which is run the
2399                  *      pre-handler, a NULL request handler, and then
2400                  *      the post handler.
2401                  */
2402                 if ((rcode < 0) && setup_post_proxy_fail(request)) {
2403                         request_pre_handler(request);
2404                 }
2405
2406                 /*
2407                  *      Else we weren't supposed to proxy it,
2408                  *      OR we proxied it internally to a virutal server.
2409                  */
2410         }
2411
2412 #ifdef WITH_COA
2413         else if (request->proxy && request->coa) {
2414                 RDEBUG("WARNING: Cannot proxy and originate CoA packets at the same time.  Cancelling CoA request");
2415                 ev_request_free(&request->coa);
2416         }
2417 #endif
2418 #endif
2419
2420         /*
2421          *      Fake requests don't get encoded or signed.  The caller
2422          *      also requires the reply VP's, so we don't free them
2423          *      here!
2424          */
2425         if (request->packet->dst_port == 0) {
2426                 /* FIXME: RDEBUG going to the next request */
2427 #ifdef HAVE_PTHREAD_H
2428                 request->child_pid = NO_SUCH_CHILD_PID;
2429 #endif
2430                 request->child_state = REQUEST_DONE;
2431                 return;
2432         }
2433
2434 #ifdef WITH_PROXY
2435         /*
2436          *      Copy Proxy-State from the request to the reply.
2437          */
2438         vp = paircopy2(request->packet->vps, PW_PROXY_STATE);
2439         if (vp) pairadd(&request->reply->vps, vp);
2440 #endif
2441
2442         /*
2443          *      Access-Requests get delayed or cached.
2444          */
2445         switch (request->packet->code) {
2446         case PW_AUTHENTICATION_REQUEST:
2447                 gettimeofday(&request->next_when, NULL);
2448
2449                 if (request->reply->code == 0) {
2450                         /*
2451                          *      Check if the lack of response is intentional.
2452                          */
2453                         vp = pairfind(request->config_items,
2454                                       PW_RESPONSE_PACKET_TYPE);
2455                         if (!vp) {
2456                                 RDEBUG2("There was no response configured: rejecting request %u",
2457                                        request->number);
2458                                 request->reply->code = PW_AUTHENTICATION_REJECT;
2459
2460                         } else if (vp->vp_integer == 256) {
2461                                 RDEBUG2("Not responding to request %u",
2462                                        request->number);
2463
2464                                 /*
2465                                  *      Force cleanup after a long
2466                                  *      time, so that we don't
2467                                  *      re-process the packet.
2468                                  */
2469                                 request->next_when.tv_sec += request->root->max_request_time;
2470                                 request->next_callback = cleanup_delay;
2471                                 child_state = REQUEST_CLEANUP_DELAY;
2472                                 break;
2473                         } else {
2474                                 request->reply->code = vp->vp_integer;
2475
2476                         }
2477                 }
2478
2479                 /*
2480                  *      Run rejected packets through
2481                  *
2482                  *      Post-Auth-Type = Reject
2483                  */
2484                 if (request->reply->code == PW_AUTHENTICATION_REJECT) {
2485                         pairdelete(&request->config_items, PW_POST_AUTH_TYPE);
2486                         vp = radius_pairmake(request, &request->config_items,
2487                                              "Post-Auth-Type", "Reject",
2488                                              T_OP_SET);
2489                         if (vp) rad_postauth(request);
2490
2491                         /*
2492                          *      If configured, delay Access-Reject packets.
2493                          *
2494                          *      If request->root->reject_delay = 0, we discover
2495                          *      that we have to send the packet now.
2496                          */
2497                         when = request->received;
2498                         when.tv_sec += request->root->reject_delay;
2499
2500                         if (timercmp(&when, &request->next_when, >)) {
2501                                 RDEBUG2("Delaying reject of request %u for %d seconds",
2502                                        request->number,
2503                                        request->root->reject_delay);
2504                                 request->next_when = when;
2505                                 request->next_callback = reject_delay;
2506 #ifdef HAVE_PTHREAD_H
2507                                 request->child_pid = NO_SUCH_CHILD_PID;
2508 #endif
2509                                 request->child_state = REQUEST_REJECT_DELAY;
2510                                 return;
2511                         }
2512                 }
2513
2514 #ifdef WITH_COA
2515         case PW_COA_REQUEST:
2516         case PW_DISCONNECT_REQUEST:
2517 #endif
2518                 request->next_when.tv_sec += request->root->cleanup_delay;
2519                 request->next_callback = cleanup_delay;
2520                 child_state = REQUEST_CLEANUP_DELAY;
2521                 break;
2522
2523         case PW_ACCOUNTING_REQUEST:
2524                 request->next_callback = NULL; /* just to be safe */
2525                 child_state = REQUEST_DONE;
2526                 break;
2527
2528                 /*
2529                  *      FIXME: Status-Server should probably not be
2530                  *      handled here...
2531                  */
2532         case PW_STATUS_SERVER:
2533                 request->next_callback = NULL;
2534                 child_state = REQUEST_DONE;
2535                 break;
2536
2537         default:
2538                 /*
2539                  *      DHCP, VMPS, etc.
2540                  */
2541                 request->next_callback = NULL;
2542                 child_state = REQUEST_DONE;
2543                 break;
2544         }
2545
2546         /*
2547          *      Suppress "no reply" packets here, unless we're reading
2548          *      from the "detail" file.  In that case, we've got to
2549          *      tell the detail file handler that the request is dead,
2550          *      and it should re-send it.
2551          *      If configured, encode, sign, and send.
2552          */
2553         if ((request->reply->code != 0) ||
2554             (request->listener->type == RAD_LISTEN_DETAIL)) {
2555                 DEBUG_PACKET(request, request->reply, 1);
2556                 request->listener->send(request->listener, request);
2557         }
2558
2559 #ifdef WITH_COA
2560         /*
2561          *      Now that we've completely processed the request,
2562          *      see if we need to originate a CoA request.  But ONLY
2563          *      if it wasn't proxied.
2564          */
2565         if (!request->proxy &&
2566             (request->coa ||
2567              (pairfind(request->config_items, PW_SEND_COA_REQUEST) != NULL))) {
2568                 if (!originated_coa_request(request)) {
2569                         RDEBUG2("Do CoA Fail handler here");
2570                 }
2571                 /* request->coa is stil set, so we can update events */
2572         }
2573 #endif
2574
2575  cleanup:
2576         /*
2577          *      Clean up.  These are no longer needed.
2578          */
2579         pairfree(&request->config_items);
2580
2581         pairfree(&request->packet->vps);
2582         request->username = NULL;
2583         request->password = NULL;
2584
2585         pairfree(&request->reply->vps);
2586
2587 #ifdef WITH_PROXY
2588         if (request->proxy) {
2589                 pairfree(&request->proxy->vps);
2590
2591                 if (request->proxy_reply) {
2592                         pairfree(&request->proxy_reply->vps);
2593                 }
2594
2595 #if 0
2596                 /*
2597                  *      We're not tracking responses from the home
2598                  *      server, we can therefore free this memory in
2599                  *      the child thread.
2600                  */
2601                 if (!request->in_proxy_hash) {
2602                         rad_free(&request->proxy);
2603                         rad_free(&request->proxy_reply);
2604                         request->home_server = NULL;
2605                 }
2606 #endif
2607         }
2608 #endif
2609
2610         RDEBUG2("Finished request %u.", request->number);
2611         rad_assert(child_state >= 0);
2612         request->child_state = child_state;
2613
2614         /*
2615          *      Single threaded mode: update timers now.
2616          */
2617         if (!have_children) wait_a_bit(request);
2618 }
2619
2620
2621 static void received_retransmit(REQUEST *request, const RADCLIENT *client)
2622 {
2623 #ifdef WITH_PROXY
2624         char buffer[128];
2625 #endif
2626
2627         RAD_STATS_TYPE_INC(request->listener, total_dup_requests);
2628         RAD_STATS_CLIENT_INC(request->listener, client, total_dup_requests);
2629
2630         switch (request->child_state) {
2631         case REQUEST_QUEUED:
2632         case REQUEST_RUNNING:
2633 #ifdef WITH_PROXY
2634         discard:
2635 #endif
2636                 radlog(L_ERR, "Discarding duplicate request from "
2637                        "client %s port %d - ID: %d due to unfinished request %u",
2638                        client->shortname,
2639                        request->packet->src_port,request->packet->id,
2640                        request->number);
2641                 break;
2642
2643 #ifdef WITH_PROXY
2644         case REQUEST_PROXIED:
2645                 /*
2646                  *      We're not supposed to have duplicate
2647                  *      accounting packets.  The other states handle
2648                  *      duplicates fine (discard, or send duplicate
2649                  *      reply).  But we do NOT want to retransmit an
2650                  *      accounting request here, because that would
2651                  *      involve updating the Acct-Delay-Time, and
2652                  *      therefore changing the packet Id, etc.
2653                  *
2654                  *      Instead, we just discard the packet.  We may
2655                  *      eventually respond, or the client will send a
2656                  *      new accounting packet.
2657                  *
2658                  *      The same comments go for Status-Server, and
2659                  *      other packet types.
2660                  *
2661                  *      FIXME: coa: when we proxy CoA && Disconnect
2662                  *      packets, this logic has to be fixed.
2663                  */
2664                 if (request->packet->code != PW_AUTHENTICATION_REQUEST) {
2665                         goto discard;
2666                 }
2667
2668                 check_for_zombie_home_server(request);
2669
2670                 /*
2671                  *      If we've just discovered that the home server
2672                  *      is dead, OR the socket has been closed, look for
2673                  *      another connection to a home server.
2674                  */
2675                 if (((request->packet->dst_port != 0) &&
2676                      (request->home_server->state == HOME_STATE_IS_DEAD)) ||
2677                     (request->proxy_listener->status != RAD_LISTEN_STATUS_KNOWN)) {
2678                         home_server *home;
2679
2680                         remove_from_proxy_hash(request);
2681
2682                         home = home_server_ldb(NULL, request->home_pool, request);
2683                         if (!home) {
2684                                 RDEBUG2("Failed to find live home server for request %u", request->number);
2685                         no_home_servers:
2686                                 /*
2687                                  *      Do post-request processing,
2688                                  *      and any insertion of necessary
2689                                  *      events.
2690                                  */
2691                                 post_proxy_fail_handler(request);
2692                                 return;
2693                         }
2694
2695                         request->proxy->code = request->packet->code;
2696
2697                         /*
2698                          *      Free the old packet, to force re-encoding
2699                          */
2700                         free(request->proxy->data);
2701                         request->proxy->data = NULL;
2702                         request->proxy->data_len = 0;
2703
2704                         /*
2705                          *      This request failed over to a virtual
2706                          *      server.  Push it back onto the queue
2707                          *      to be processed.
2708                          */
2709                         if (request->home_server->server) {
2710                                 proxy_fallback_handler(request);
2711                                 return;
2712                         }
2713
2714                         /*
2715                          *      Try to proxy the request.
2716                          */
2717                         if (!proxy_request(request)) {
2718                                 RDEBUG("ERROR: Failed to re-proxy request %u", request->number);
2719                                 goto no_home_servers;
2720                         }
2721
2722                         /*
2723                          *      This code executes in the main server
2724                          *      thread, so there's no need for locking.
2725                          */
2726                         rad_assert(request->next_callback != NULL);
2727                         INSERT_EVENT(request->next_callback, request);
2728                         request->next_callback = NULL;
2729                         return;
2730                 } /* else the home server is still alive */
2731
2732 #ifdef WITH_TCP
2733                 if (request->home_server->proto == IPPROTO_TCP) {
2734                         DEBUG2("Suppressing duplicate proxied request to home server %s port %d proto TCP - ID: %d",
2735                                inet_ntop(request->proxy->dst_ipaddr.af,
2736                                          &request->proxy->dst_ipaddr.ipaddr,
2737                                          buffer, sizeof(buffer)),
2738                                request->proxy->dst_port,
2739                                request->proxy->id);
2740                         break;
2741                 }
2742 #endif
2743
2744                 RDEBUG2("Sending duplicate proxied request to home server %s port %d - ID: %d",
2745                        inet_ntop(request->proxy->dst_ipaddr.af,
2746                                  &request->proxy->dst_ipaddr.ipaddr,
2747                                  buffer, sizeof(buffer)),
2748                        request->proxy->dst_port,
2749                        request->proxy->id);
2750                 request->num_proxied_requests++;
2751
2752                 DEBUG_PACKET(request, request->proxy, 1);
2753                 request->proxy_listener->send(request->proxy_listener,
2754                                               request);
2755                 break;
2756 #endif
2757
2758         case REQUEST_REJECT_DELAY:
2759                 RDEBUG2("Waiting to send Access-Reject "
2760                        "to client %s port %d - ID: %d",
2761                        client->shortname,
2762                        request->packet->src_port, request->packet->id);
2763                 break;
2764
2765         case REQUEST_CLEANUP_DELAY:
2766         case REQUEST_DONE:
2767                 if (request->reply->code == 0) {
2768                         RDEBUG2("Ignoring retransmit from client %s port %d "
2769                                 "- ID: %d, no reply was configured",
2770                                 client->shortname,
2771                                 request->packet->src_port, request->packet->id);
2772                         return;
2773                 }
2774
2775                 /*
2776                  *      FIXME: This sends duplicate replies to
2777                  *      accounting requests, even if Acct-Delay-Time
2778                  *      or Event-Timestamp is in the packet.  In those
2779                  *      cases, the Id should be changed, and the packet
2780                  *      re-calculated.
2781                  */
2782                 RDEBUG2("Sending duplicate reply "
2783                        "to client %s port %d - ID: %d",
2784                        client->shortname,
2785                        request->packet->src_port, request->packet->id);
2786                 DEBUG_PACKET(request, request->reply, 1);
2787                 request->listener->send(request->listener, request);
2788                 break;
2789         }
2790 }
2791
2792
2793 static void received_conflicting_request(REQUEST *request,
2794                                          const RADCLIENT *client)
2795 {
2796         radlog(L_ERR, "Received conflicting packet from "
2797                "client %s port %d - ID: %d due to unfinished request %u.  Giving up on old request.",
2798                client->shortname,
2799                request->packet->src_port, request->packet->id,
2800                request->number);
2801
2802         /*
2803          *      Nuke it from the request hash, so we can receive new
2804          *      packets.
2805          */
2806         remove_from_request_hash(request);
2807
2808         switch (request->child_state) {
2809                 /*
2810                  *      Tell it to stop, and wait for it to do so.
2811                  */
2812         default:
2813                 request->master_state = REQUEST_STOP_PROCESSING;
2814                 request->delay += request->delay >> 1;
2815
2816                 tv_add(&request->when, request->delay);
2817
2818                 INSERT_EVENT(wait_for_child_to_die, request);
2819                 return;
2820
2821                 /*
2822                  *      Catch race conditions.  It may have switched
2823                  *      from running to done while this code is being
2824                  *      executed.
2825                  */
2826         case REQUEST_REJECT_DELAY:
2827         case REQUEST_CLEANUP_DELAY:
2828         case REQUEST_DONE:
2829                 break;
2830         }
2831 }
2832
2833
2834 static int can_handle_new_request(RADIUS_PACKET *packet,
2835                                   RADCLIENT *client,
2836                                   struct main_config_t *root)
2837 {
2838         /*
2839          *      Count the total number of requests, to see if
2840          *      there are too many.  If so, return with an
2841          *      error.
2842          */
2843         if (root->max_requests) {
2844                 int request_count = fr_packet_list_num_elements(pl);
2845
2846                 /*
2847                  *      This is a new request.  Let's see if
2848                  *      it makes us go over our configured
2849                  *      bounds.
2850                  */
2851                 if (request_count > root->max_requests) {
2852                         radlog(L_ERR, "Dropping request (%d is too many): "
2853                                "from client %s port %d - ID: %d", request_count,
2854                                client->shortname,
2855                                packet->src_port, packet->id);
2856                         radlog(L_INFO, "WARNING: Please check the configuration file.\n"
2857                                "\tThe value for 'max_requests' is probably set too low.\n");
2858                         return 0;
2859                 } /* else there were a small number of requests */
2860         } /* else there was no configured limit for requests */
2861
2862         /*
2863          *      FIXME: Add per-client checks.  If one client is sending
2864          *      too many packets, start discarding them.
2865          *
2866          *      We increment the counters here, and decrement them
2867          *      when the response is sent... somewhere in this file.
2868          */
2869
2870         /*
2871          *      FUTURE: Add checks for system load.  If the system is
2872          *      busy, start dropping requests...
2873          *
2874          *      We can probably keep some statistics ourselves...  if
2875          *      there are more requests coming in than we can handle,
2876          *      start dropping some.
2877          */
2878
2879         return 1;
2880 }
2881
2882
2883 int received_request(rad_listen_t *listener,
2884                      RADIUS_PACKET *packet, REQUEST **prequest,
2885                      RADCLIENT *client)
2886 {
2887         RADIUS_PACKET **packet_p;
2888         REQUEST *request = NULL;
2889         struct main_config_t *root = &mainconfig;
2890
2891         packet_p = fr_packet_list_find(pl, packet);
2892         if (packet_p) {
2893                 request = fr_packet2myptr(REQUEST, packet, packet_p);
2894                 rad_assert(request->in_request_hash);
2895
2896                 if ((request->packet->data_len == packet->data_len) &&
2897                     (memcmp(request->packet->vector, packet->vector,
2898                             sizeof(packet->vector)) == 0)) {
2899                         received_retransmit(request, client);
2900                         return 0;
2901                 }
2902
2903                 /*
2904                  *      The new request is different from the old one,
2905                  *      but maybe the old is finished.  If so, delete
2906                  *      the old one.
2907                  */
2908                 switch (request->child_state) {
2909                         struct timeval when;
2910
2911                 default:
2912                         /*
2913                          *      Special hacks for race conditions.
2914                          *      The reply is encoded, and therefore
2915                          *      likely sent.  We received a *new*
2916                          *      packet from the client, likely before
2917                          *      the next line or two of code which
2918                          *      updated the child state.  In this
2919                          *      case, just accept the new request.
2920                          */
2921                         if ((request->reply->code != 0) &&
2922                             request->reply->data) {
2923                                 radlog(L_INFO, "WARNING: Allowing fast client %s port %d - ID: %d for recent request %u.",
2924                                        client->shortname,
2925                                        packet->src_port, packet->id,
2926                                        request->number);
2927                                 remove_from_request_hash(request);
2928                                 request = NULL;
2929                                 break;
2930                         }
2931
2932                         gettimeofday(&when, NULL);
2933                         when.tv_sec -= 1;
2934
2935                         /*
2936                          *      If the cached request was received
2937                          *      within the last second, then we
2938                          *      discard the NEW request instead of the
2939                          *      old one.  This will happen ONLY when
2940                          *      the client is severely broken, and is
2941                          *      sending conflicting packets very
2942                          *      quickly.
2943                          */
2944                         if (timercmp(&when, &request->received, <)) {
2945                                 radlog(L_ERR, "Discarding conflicting packet from "
2946                                        "client %s port %d - ID: %d due to recent request %u.",
2947                                        client->shortname,
2948                                        packet->src_port, packet->id,
2949                                        request->number);
2950                                 return 0;
2951                         }
2952
2953                         received_conflicting_request(request, client);
2954                         request = NULL;
2955                         break;
2956
2957                 case REQUEST_REJECT_DELAY:
2958                 case REQUEST_CLEANUP_DELAY:
2959                         request->child_state = REQUEST_DONE;
2960                 case REQUEST_DONE:
2961                         cleanup_delay(request);
2962                         request = NULL;
2963                         break;
2964                 }
2965         }
2966
2967         /*
2968          *      We may want to quench the new request.
2969          */
2970         if ((listener->type != RAD_LISTEN_DETAIL) &&
2971             !can_handle_new_request(packet, client, root)) {
2972                 return 0;
2973         }
2974
2975         /*
2976          *      Create and initialize the new request.
2977          */
2978         request = request_alloc(); /* never fails */
2979
2980         if ((request->reply = rad_alloc(0)) == NULL) {
2981                 radlog(L_ERR, "No memory");
2982                 return 0;
2983         }
2984
2985         request->listener = listener;
2986         request->client = client;
2987         request->packet = packet;
2988         request->packet->timestamp = request->timestamp;
2989         request->number = request_num_counter++;
2990         request->priority = listener->type;
2991 #ifdef HAVE_PTHREAD_H
2992         request->child_pid = NO_SUCH_CHILD_PID;
2993 #endif
2994
2995         /*
2996          *      Status-Server packets go to the head of the queue.
2997          */
2998         if (request->packet->code == PW_STATUS_SERVER) request->priority = 0;
2999
3000         /*
3001          *      Set virtual server identity
3002          */
3003         if (client->server) {
3004                 request->server = client->server;
3005         } else if (listener->server) {
3006                 request->server = listener->server;
3007         } else {
3008                 request->server = NULL;
3009         }
3010
3011         /*
3012          *      Remember the request in the list.
3013          */
3014         if (!fr_packet_list_insert(pl, &request->packet)) {
3015                 radlog(L_ERR, "Failed to insert request %u in the list of live requests: discarding", request->number);
3016                 ev_request_free(&request);
3017                 return 0;
3018         }
3019
3020         request->in_request_hash = TRUE;
3021         request->root = root;
3022         root->refcount++;
3023 #ifdef WITH_TCP
3024         request->listener->count++;
3025 #endif
3026
3027         /*
3028          *      The request passes many of our sanity checks.
3029          *      From here on in, if anything goes wrong, we
3030          *      send a reject message, instead of dropping the
3031          *      packet.
3032          */
3033
3034         /*
3035          *      Build the reply template from the request.
3036          */
3037
3038         request->reply->sockfd = request->packet->sockfd;
3039         request->reply->dst_ipaddr = request->packet->src_ipaddr;
3040         request->reply->src_ipaddr = request->packet->dst_ipaddr;
3041         request->reply->dst_port = request->packet->src_port;
3042         request->reply->src_port = request->packet->dst_port;
3043         request->reply->id = request->packet->id;
3044         request->reply->code = 0; /* UNKNOWN code */
3045         memcpy(request->reply->vector, request->packet->vector,
3046                sizeof(request->reply->vector));
3047         request->reply->vps = NULL;
3048         request->reply->data = NULL;
3049         request->reply->data_len = 0;
3050
3051         request->master_state = REQUEST_ACTIVE;
3052         request->child_state = REQUEST_QUEUED;
3053         request->next_callback = NULL;
3054
3055         gettimeofday(&request->received, NULL);
3056         request->timestamp = request->received.tv_sec;
3057         request->when = request->received;
3058
3059         request->delay = USEC;
3060
3061         tv_add(&request->when, request->delay);
3062
3063         INSERT_EVENT(wait_a_bit, request);
3064
3065         *prequest = request;
3066         return 1;
3067 }
3068
3069
3070 #ifdef WITH_PROXY
3071 REQUEST *received_proxy_response(RADIUS_PACKET *packet)
3072 {
3073         char            buffer[128];
3074         REQUEST         *request;
3075
3076         /*
3077          *      Also removes from the proxy hash if responses == requests
3078          */
3079         request = lookup_in_proxy_hash(packet);
3080
3081         if (!request) {
3082                 radlog(L_PROXY, "No outstanding request was found for reply from host %s port %d - ID %d",
3083                        inet_ntop(packet->src_ipaddr.af,
3084                                  &packet->src_ipaddr.ipaddr,
3085                                  buffer, sizeof(buffer)),
3086                        packet->src_port, packet->id);
3087                 return NULL;
3088         }
3089
3090         /*
3091          *      We haven't replied to the NAS, but we have seen an
3092          *      earlier reply from the home server.  Ignore this packet,
3093          *      as we're likely still processing the previous reply.
3094          */
3095         if (request->proxy_reply) {
3096                 if (memcmp(request->proxy_reply->vector,
3097                            packet->vector,
3098                            sizeof(request->proxy_reply->vector)) == 0) {
3099                         RDEBUG2("Discarding duplicate reply from host %s port %d  - ID: %d for request %u",
3100                                inet_ntop(packet->src_ipaddr.af,
3101                                          &packet->src_ipaddr.ipaddr,
3102                                          buffer, sizeof(buffer)),
3103                                packet->src_port, packet->id,
3104                                request->number);
3105                 } else {
3106                         /*
3107                          *      ? The home server gave us a new proxy
3108                          *      reply which doesn't match the old
3109                          *      one.  Delete it.
3110                          */
3111                         RDEBUG2("Ignoring conflicting proxy reply");
3112                 }
3113
3114                 /* assert that there's an event queued for request? */
3115                 return NULL;
3116         }
3117
3118         /*
3119          *      Verify the packet before doing ANYTHING with it.  This
3120          *      means we're doing more MD5 checks in the server core.
3121          *      However, we can fix that by moving to multiple threads
3122          *      listening on sockets.
3123          *
3124          *      We do this AFTER looking the request up in the hash,
3125          *      and AFTER vhecking if we saw a previous request.  This
3126          *      helps minimize the DoS effect of people attacking us
3127          *      with spoofed packets.
3128          */
3129         if (rad_verify(packet, request->proxy,
3130                        request->home_server->secret) != 0) {
3131                 DEBUG("Ignoring spoofed proxy reply.  Signature is invalid");
3132                 return NULL;
3133         }
3134
3135         gettimeofday(&now, NULL);
3136
3137         /*
3138          *      Maybe move this earlier in the decision process?
3139          *      Having it here means that late or duplicate proxy
3140          *      replies no longer get the home server marked as
3141          *      "alive".  This might be good for stability, though.
3142          *
3143          *      FIXME: Do we really want to do this whenever we
3144          *      receive a packet?  Setting this here means that we
3145          *      mark it alive on *any* packet, even if it's lost all
3146          *      of the *other* packets in the last 10s.
3147          */
3148         if (request->proxy->code != PW_STATUS_SERVER) {
3149                 request->home_server->state = HOME_STATE_ALIVE;
3150         }
3151
3152 #ifdef WITH_COA
3153         /*
3154          *      When originating CoA, the "proxy" reply is the reply
3155          *      to the CoA request that we originated.  At this point,
3156          *      the original request is finished, and it has a reply.
3157          *
3158          *      However, if we haven't separated the two requests, do
3159          *      so now.  This is done so that cleaning up the original
3160          *      request won't cause the CoA request to be free'd.  See
3161          *      util.c, request_free()
3162          */
3163         if (request->parent && (request->parent->coa == request)) {
3164                 request->parent->coa = NULL;
3165                 request->parent = NULL;
3166
3167                 /*
3168                  *      The proxied packet was different from the
3169                  *      original packet, AND the proxied packet was
3170                  *      a CoA: allow it.
3171                  */
3172         } else if ((request->packet->code != request->proxy->code) &&
3173                    ((request->proxy->code == PW_COA_REQUEST) ||
3174                     (request->proxy->code == PW_DISCONNECT_REQUEST))) {
3175           /*
3176            *    It's already divorced: do nothing.
3177            */
3178
3179         } else
3180                 /*
3181                  *      Skip the next set of checks, as the original
3182                  *      reply is cached.  We want to be able to still
3183                  *      process the CoA reply, AND to reference the
3184                  *      original request/reply.
3185                  *
3186                  *      This is getting to be really quite a bit of a
3187                  *      hack.
3188                  */
3189 #endif
3190
3191         /*
3192          *      If there's a reply to the NAS, ignore everything
3193          *      related to proxy responses
3194          */
3195         if (request->reply && request->reply->code != 0) {
3196                 RDEBUG2("Ignoring proxy reply that arrived after we sent a reply to the NAS");
3197                 return NULL;
3198         }
3199
3200 #ifdef WITH_STATS
3201         /*
3202          *      The average includes our time to receive packets and
3203          *      look them up in the hashes, which should be the same
3204          *      for all packets.
3205          *
3206          *      We update the response time only for the FIRST packet
3207          *      we receive.
3208          */
3209         if (request->home_server->ema.window > 0) {
3210                 radius_stats_ema(&request->home_server->ema,
3211                                  &now, &request->proxy_when);
3212         }
3213 #endif
3214
3215         switch (request->child_state) {
3216         case REQUEST_QUEUED:
3217         case REQUEST_RUNNING:
3218                 radlog(L_ERR, "Internal sanity check failed for child state");
3219                 /* FALL-THROUGH */
3220
3221         case REQUEST_REJECT_DELAY:
3222         case REQUEST_CLEANUP_DELAY:
3223         case REQUEST_DONE:
3224                 radlog(L_ERR, "Reply from home server %s port %d  - ID: %d arrived too late for request %u. Try increasing 'retry_delay' or 'max_request_time'",
3225                        inet_ntop(packet->src_ipaddr.af,
3226                                  &packet->src_ipaddr.ipaddr,
3227                                  buffer, sizeof(buffer)),
3228                        packet->src_port, packet->id,
3229                        request->number);
3230                 /* assert that there's an event queued for request? */
3231                 return NULL;
3232
3233         case REQUEST_PROXIED:
3234                 break;
3235         }
3236
3237         request->proxy_reply = packet;
3238
3239 #if 0
3240         /*
3241          *      Perform RTT calculations, as per RFC 2988 (for TCP).
3242          *      Note that we only do so on the first response.
3243          */
3244         if ((request->num_proxied_responses == 1)
3245                 int rtt;
3246                 home_server *home = request->home_server;
3247
3248                 rtt = now.tv_sec - request->proxy_when.tv_sec;
3249                 rtt *= USEC;
3250                 rtt += now.tv_usec;
3251                 rtt -= request->proxy_when.tv_usec;
3252
3253                 if (!home->has_rtt) {
3254                         home->has_rtt = TRUE;
3255
3256                         home->srtt = rtt;
3257                         home->rttvar = rtt / 2;
3258
3259                 } else {
3260                         home->rttvar -= home->rttvar >> 2;
3261                         home->rttvar += (home->srtt - rtt);
3262                         home->srtt -= home->srtt >> 3;
3263                         home->srtt += rtt >> 3;
3264                 }
3265
3266                 home->rto = home->srtt;
3267                 if (home->rttvar > (USEC / 4)) {
3268                         home->rto += home->rttvar * 4;
3269                 } else {
3270                         home->rto += USEC;
3271                 }
3272         }
3273 #endif
3274
3275         /*
3276          *      There's no incoming request, so it's a proxied packet
3277          *      we originated.
3278          */
3279         if (!request->packet) {
3280                 received_response_to_ping(request);
3281                 request->proxy_reply = NULL; /* caller will free it */
3282                 ev_request_free(&request);
3283                 return NULL;
3284         }
3285
3286         request->child_state = REQUEST_QUEUED;
3287         request->when = now;
3288         request->delay = USEC;
3289         request->priority = RAD_LISTEN_PROXY;
3290         tv_add(&request->when, request->delay);
3291
3292         /*
3293          *      Wait a bit will take care of max_request_time
3294          */
3295         INSERT_EVENT(wait_a_bit, request);
3296
3297         return request;
3298 }
3299
3300 #endif /* WITH_PROXY */
3301
3302 #ifdef WITH_TCP
3303 static void tcp_socket_lifetime(void *ctx)
3304 {
3305         rad_listen_t *listener = ctx;
3306         char buffer[256];
3307
3308         listener->print(listener, buffer, sizeof(buffer));
3309
3310         DEBUG("Reached maximum lifetime on socket %s", buffer);
3311
3312         listener->status = RAD_LISTEN_STATUS_CLOSED;
3313         event_new_fd(listener);
3314 }
3315
3316 static void tcp_socket_idle_timeout(void *ctx)
3317 {
3318         rad_listen_t *listener = ctx;
3319         listen_socket_t *sock = listener->data;
3320         char buffer[256];
3321
3322         fr_event_now(el, &now); /* should always succeed... */
3323
3324         rad_assert(sock->home != NULL);
3325
3326         /*
3327          *      We implement idle timeout by polling, because it's
3328          *      cheaper than resetting the idle timeout every time
3329          *      we send / receive a packet.
3330          */
3331         if ((sock->last_packet + sock->home->idle_timeout) > now.tv_sec) {
3332                 struct timeval when;
3333                 void *fun = tcp_socket_idle_timeout;
3334
3335                 when.tv_sec = sock->last_packet;
3336                 when.tv_sec += sock->home->idle_timeout;
3337                 when.tv_usec = 0;
3338
3339                 if (sock->home->lifetime &&
3340                     (sock->opened + sock->home->lifetime < when.tv_sec)) {
3341                         when.tv_sec = sock->opened + sock->home->lifetime;
3342                         fun = tcp_socket_lifetime;
3343                 }
3344
3345                 if (!fr_event_insert(el, fun, listener, &when, &sock->ev)) {
3346                         rad_panic("Failed to insert event");
3347                 }
3348
3349                 return;
3350         }
3351
3352         listener->print(listener, buffer, sizeof(buffer));
3353
3354         DEBUG("Reached idle timeout on socket %s", buffer);
3355
3356         listener->status = RAD_LISTEN_STATUS_CLOSED;
3357         event_new_fd(listener);
3358 }
3359 #endif
3360
3361 int event_new_fd(rad_listen_t *this)
3362 {
3363         char buffer[1024];
3364
3365         if (this->status == RAD_LISTEN_STATUS_KNOWN) return 1;
3366
3367         this->print(this, buffer, sizeof(buffer));
3368
3369         if (this->status == RAD_LISTEN_STATUS_INIT) {
3370                 if (just_started) {
3371                         DEBUG("Listening on %s", buffer);
3372                 } else {
3373                         radlog(L_INFO, " ... adding new socket %s", buffer);
3374                 }
3375
3376 #ifdef WITH_PROXY
3377                 /*
3378                  *      Add it to the list of sockets we can use.
3379                  *      Server sockets (i.e. auth/acct) are never
3380                  *      added to the packet list.
3381                  */
3382                 if (this->type == RAD_LISTEN_PROXY) {
3383                         listen_socket_t *sock = this->data;
3384
3385                         PTHREAD_MUTEX_LOCK(&proxy_mutex);
3386                         if (!fr_packet_list_socket_add(proxy_list, this->fd,
3387                                                        sock->proto,
3388                                                        &sock->other_ipaddr, sock->other_port,
3389                                                        this)) {
3390
3391                                 proxy_no_new_sockets = TRUE;
3392                                 PTHREAD_MUTEX_UNLOCK(&proxy_mutex);
3393
3394                                 /*
3395                                  *      This is bad.  However, the
3396                                  *      packet list now supports 256
3397                                  *      open sockets, which should
3398                                  *      minimize this problem.
3399                                  */
3400                                 radlog(L_ERR, "Failed adding proxy socket: %s",
3401                                        fr_strerror());
3402                                 return 0;
3403                         }
3404
3405                         if (sock->home) {
3406                                 sock->home->num_connections++;
3407
3408                                 /*
3409                                  *      If necessary, add it to the list of
3410                                  *      new proxy listeners.
3411                                  */
3412                                 if (sock->home->lifetime || sock->home->idle_timeout) {
3413                                         this->next = proxy_listener_list;
3414                                         proxy_listener_list = this;
3415                                 }
3416                         }
3417                         PTHREAD_MUTEX_UNLOCK(&proxy_mutex);
3418
3419                         /*
3420                          *      Tell the main thread that we've added
3421                          *      a proxy listener, but only if we need
3422                          *      to update the event list.  Do this
3423                          *      with the mutex unlocked, to reduce
3424                          *      contention.
3425                          */
3426                         if (sock->home) {
3427                                 if (sock->home->lifetime || sock->home->idle_timeout) {
3428                                         radius_signal_self(RADIUS_SIGNAL_SELF_NEW_FD);
3429                                 }
3430                         }
3431                 }
3432 #endif
3433
3434 #ifdef WITH_DETAIL
3435                 /*
3436                  *      Detail files are always known, and aren't
3437                  *      put into the socket event loop.
3438                  */
3439                 if (this->type == RAD_LISTEN_DETAIL) {
3440                         this->status = RAD_LISTEN_STATUS_KNOWN;
3441
3442                         /*
3443                          *      Set up the first poll interval.
3444                          */
3445                         event_poll_detail(this);
3446                         return 1;
3447                 }
3448 #endif
3449
3450                 FD_MUTEX_LOCK(&fd_mutex);
3451                 if (!fr_event_fd_insert(el, 0, this->fd,
3452                                         event_socket_handler, this)) {
3453                         radlog(L_ERR, "Failed adding event handler for proxy socket!");
3454                         exit(1);
3455                 }
3456                 FD_MUTEX_UNLOCK(&fd_mutex);
3457
3458                 this->status = RAD_LISTEN_STATUS_KNOWN;
3459                 return 1;
3460         }
3461
3462         /*
3463          *      Something went wrong with the socket: make it harmless.
3464          */
3465         if (this->status == RAD_LISTEN_STATUS_REMOVE_FD) {
3466                 int devnull;
3467
3468                 /*
3469                  *      Remove it from the list of live FD's.
3470                  */
3471                 FD_MUTEX_LOCK(&fd_mutex);
3472                 fr_event_fd_delete(el, 0, this->fd);
3473                 FD_MUTEX_UNLOCK(&fd_mutex);
3474
3475 #ifdef WITH_TCP
3476                 /*
3477                  *      We track requests using this socket only for
3478                  *      TCP.  For UDP, we don't currently close
3479                  *      sockets.
3480                  */
3481 #ifdef WITH_PROXY
3482                 if (this->type != RAD_LISTEN_PROXY)
3483 #endif
3484                 {
3485                         if (this->count != 0) {
3486                                 fr_packet_list_walk(pl, this,
3487                                                     remove_all_requests);
3488                         }
3489
3490                         if (this->count == 0) {
3491                                 this->status = RAD_LISTEN_STATUS_FINISH;
3492                                 goto finish;
3493                         }
3494                 }
3495 #ifdef WITH_PROXY
3496                 else {
3497                         int count = this->count;
3498
3499                         /*
3500                          *      Duplicate code
3501                          */
3502                         PTHREAD_MUTEX_LOCK(&proxy_mutex);
3503                         if (!fr_packet_list_socket_freeze(proxy_list,
3504                                                           this->fd)) {
3505                                 radlog(L_ERR, "Fatal error freezing socket: %s",
3506                                        fr_strerror());
3507                                 exit(1);
3508                         }
3509
3510                         /*
3511                          *      Doing this with the proxy mutex held
3512                          *      is a Bad Thing.  We should move to
3513                          *      finer-grained mutexes.
3514                          */
3515                         count = this->count;
3516                         if (count > 0) {
3517                                 fr_packet_list_walk(proxy_list, this,
3518                                                     remove_all_proxied_requests);
3519                         }
3520                         count = this->count; /* protected by mutex */
3521                         PTHREAD_MUTEX_UNLOCK(&proxy_mutex);
3522
3523                         if (count == 0) {
3524                                 this->status = RAD_LISTEN_STATUS_FINISH;
3525                                 goto finish;
3526                         }
3527                 }
3528 #endif  /* WITH_PROXY */
3529 #endif  /* WITH_TCP */
3530
3531                 /*
3532                  *      Re-open the socket, pointing it to /dev/null.
3533                  *      This means that all writes proceed without
3534                  *      blocking, and all reads return "no data".
3535                  *
3536                  *      This leaves the socket active, so any child
3537                  *      threads won't go insane.  But it means that
3538                  *      they cannot send or receive any packets.
3539                  *
3540                  *      This is EXTRA work in the normal case, when
3541                  *      sockets are closed without error.  But it lets
3542                  *      us have one simple processing method for all
3543                  *      sockets.
3544                  */
3545                 devnull = open("/dev/null", O_RDWR);
3546                 if (devnull < 0) {
3547                         radlog(L_ERR, "FATAL failure opening /dev/null: %s",
3548                                strerror(errno));
3549                         exit(1);
3550                 }
3551                 if (dup2(devnull, this->fd) < 0) {
3552                         radlog(L_ERR, "FATAL failure closing socket: %s",
3553                                strerror(errno));
3554                         exit(1);
3555                 }
3556                 close(devnull);
3557
3558                 this->status = RAD_LISTEN_STATUS_CLOSED;
3559
3560                 /*
3561                  *      Fall through to the next section.
3562                  */
3563         }
3564
3565 #ifdef WITH_TCP
3566         /*
3567          *      Called ONLY from the main thread.  On the following
3568          *      conditions:
3569          *
3570          *      idle timeout
3571          *      max lifetime
3572          *
3573          *      (and falling through from "forcibly close FD" above)
3574          *      client closed connection on us
3575          *      client sent us a bad packet.
3576          */
3577         if (this->status == RAD_LISTEN_STATUS_CLOSED) {
3578                 int count = this->count;
3579                 rad_assert(this->type != RAD_LISTEN_DETAIL);
3580
3581 #ifdef WITH_PROXY
3582                 /*
3583                  *      Remove it from the list of active sockets, so
3584                  *      that it isn't used when proxying new packets.
3585                  */
3586                 if (this->type == RAD_LISTEN_PROXY) {
3587                         PTHREAD_MUTEX_LOCK(&proxy_mutex);
3588                         if (!fr_packet_list_socket_freeze(proxy_list,
3589                                                           this->fd)) {
3590                                 radlog(L_ERR, "Fatal error freezing socket: %s",
3591                                        fr_strerror());
3592                                 exit(1);
3593                         }
3594                         count = this->count; /* protected by mutex */
3595                         PTHREAD_MUTEX_UNLOCK(&proxy_mutex);
3596                 }
3597 #endif
3598
3599                 /*
3600                  *      Requests are still using the socket.  Wait for
3601                  *      them to finish.
3602                  */
3603                 if (count != 0) {
3604                         struct timeval when;
3605                         listen_socket_t *sock = this->data;
3606
3607                         /*
3608                          *      Try again to clean up the socket in 30
3609                          *      seconds.
3610                          */
3611                         gettimeofday(&when, NULL);
3612                         when.tv_sec += 30;
3613
3614                         if (!fr_event_insert(el,
3615                                              (fr_event_callback_t) event_new_fd,
3616                                              this, &when, &sock->ev)) {
3617                                 rad_panic("Failed to insert event");
3618                         }
3619
3620                         return 1;
3621                 }
3622
3623                 /*
3624                  *      No one is using this socket: we can delete it
3625                  *      immediately.
3626                  */
3627                 this->status = RAD_LISTEN_STATUS_FINISH;
3628         }
3629
3630 finish:
3631         if (this->status == RAD_LISTEN_STATUS_FINISH) {
3632                 listen_socket_t *sock = this->data;
3633
3634                 rad_assert(this->count == 0);
3635                 radlog(L_INFO, " ... closing socket %s", buffer);
3636
3637                 /*
3638                  *      Remove it from the list of live FD's.  Note
3639                  *      that it MAY also have been removed above.  We
3640                  *      do it again here, to catch the case of sockets
3641                  *      closing on idle timeout, or max
3642                  *      lifetime... AFTER all requests have finished
3643                  *      using it.
3644                  */
3645                 FD_MUTEX_LOCK(&fd_mutex);
3646                 fr_event_fd_delete(el, 0, this->fd);
3647                 FD_MUTEX_UNLOCK(&fd_mutex);
3648
3649 #ifdef WITH_PROXY
3650                 /*
3651                  *      Remove it from the list of sockets to be used
3652                  *      when proxying.
3653                  */
3654                 if (this->type == RAD_LISTEN_PROXY) {
3655                         PTHREAD_MUTEX_LOCK(&proxy_mutex);
3656                         if (!fr_packet_list_socket_remove(proxy_list,
3657                                                           this->fd, NULL)) {
3658                                 radlog(L_ERR, "Fatal error removing socket: %s",
3659                                        fr_strerror());
3660                                 exit(1);
3661                         }
3662                         if (sock->home) sock->home->num_connections--;
3663                         PTHREAD_MUTEX_UNLOCK(&proxy_mutex);
3664                 }
3665 #endif
3666
3667                 /*
3668                  *      Remove any pending cleanups.
3669                  */
3670                 if (sock->ev) fr_event_delete(el, &sock->ev);
3671
3672                 /*
3673                  *      And finally, close the socket.
3674                  */
3675                 listen_free(&this);
3676         }
3677 #endif  /* WITH_TCP */
3678
3679         return 1;
3680 }
3681
3682 static void handle_signal_self(int flag)
3683 {
3684         if ((flag & (RADIUS_SIGNAL_SELF_EXIT | RADIUS_SIGNAL_SELF_TERM)) != 0) {
3685                 if ((flag & RADIUS_SIGNAL_SELF_EXIT) != 0) {
3686                         radlog(L_INFO, "Received TERM signal");
3687                         fr_event_loop_exit(el, 1);
3688                 } else {
3689                         fr_event_loop_exit(el, 2);
3690                 }
3691
3692                 return;
3693         } /* else exit/term flags weren't set */
3694
3695         /*
3696          *      Tell the even loop to stop processing.
3697          */
3698         if ((flag & RADIUS_SIGNAL_SELF_HUP) != 0) {
3699                 time_t when;
3700                 static time_t last_hup = 0;
3701
3702                 when = time(NULL);
3703                 if ((int) (when - last_hup) < 5) {
3704                         radlog(L_INFO, "Ignoring HUP (less than 5s since last one)");
3705                         return;
3706                 }
3707
3708                 radlog(L_INFO, "Received HUP signal.");
3709
3710                 last_hup = when;
3711
3712                 fr_event_loop_exit(el, 0x80);
3713         }
3714
3715 #ifdef WITH_DETAIL
3716         if ((flag & RADIUS_SIGNAL_SELF_DETAIL) != 0) {
3717                 rad_listen_t *this;
3718
3719                 /*
3720                  *      FIXME: O(N) loops suck.
3721                  */
3722                 for (this = mainconfig.listen;
3723                      this != NULL;
3724                      this = this->next) {
3725                         if (this->type != RAD_LISTEN_DETAIL) continue;
3726
3727                         /*
3728                          *      This one didn't send the signal, skip
3729                          *      it.
3730                          */
3731                         if (!this->decode(this, NULL)) continue;
3732
3733                         /*
3734                          *      Go service the interrupt.
3735                          */
3736                         event_poll_detail(this);
3737                 }
3738         }
3739 #endif
3740
3741 #ifdef WITH_TCP
3742 #ifdef WITH_PROXY
3743         /*
3744          *      Add event handlers for idle timeouts && maximum lifetime.
3745          */
3746         if ((flag & RADIUS_SIGNAL_SELF_NEW_FD) != 0) {
3747                 struct timeval when;
3748                 void *fun = NULL;
3749
3750                 fr_event_now(el, &now);
3751
3752                 PTHREAD_MUTEX_LOCK(&proxy_mutex);
3753
3754                 while (proxy_listener_list) {
3755                         rad_listen_t *this = proxy_listener_list;
3756                         listen_socket_t *sock = this->data;
3757
3758                         proxy_listener_list = this->next;
3759                         this->next = NULL;
3760
3761                         if (!sock->home) continue; /* skip UDP sockets */
3762
3763                         when = now;
3764
3765                         if (!sock->home->idle_timeout) {
3766                                 rad_assert(sock->home->lifetime != 0);
3767
3768                                 when.tv_sec += sock->home->lifetime;
3769                                 fun = tcp_socket_lifetime;
3770                         } else {
3771                                 rad_assert(sock->home->idle_timeout != 0);
3772
3773                                 when.tv_sec += sock->home->idle_timeout;
3774                                 fun = tcp_socket_idle_timeout;
3775                         }
3776
3777                         if (!fr_event_insert(el, fun, this, &when,
3778                                              &(sock->ev))) {
3779                                 rad_panic("Failed to insert event");
3780                         }
3781                 }
3782
3783                 PTHREAD_MUTEX_UNLOCK(&proxy_mutex);
3784         }
3785 #endif  /* WITH_PROXY */
3786 #endif  /* WITH_TCP */
3787 }
3788
3789 #ifndef WITH_SELF_PIPE
3790 void radius_signal_self(int flag)
3791 {
3792         handle_signal_self(flag);
3793 }
3794 #else
3795 /*
3796  *      Inform ourselves that we received a signal.
3797  */
3798 void radius_signal_self(int flag)
3799 {
3800         ssize_t rcode;
3801         uint8_t buffer[16];
3802
3803         /*
3804          *      The read MUST be non-blocking for this to work.
3805          */
3806         rcode = read(self_pipe[0], buffer, sizeof(buffer));
3807         if (rcode > 0) {
3808                 ssize_t i;
3809
3810                 for (i = 0; i < rcode; i++) {
3811                         buffer[0] |= buffer[i];
3812                 }
3813         } else {
3814                 buffer[0] = 0;
3815         }
3816
3817         buffer[0] |= flag;
3818
3819         write(self_pipe[1], buffer, 1);
3820 }
3821
3822
3823 static void event_signal_handler(UNUSED fr_event_list_t *xel,
3824                                  UNUSED int fd, UNUSED void *ctx)
3825 {
3826         ssize_t i, rcode;
3827         uint8_t buffer[32];
3828
3829         rcode = read(self_pipe[0], buffer, sizeof(buffer));
3830         if (rcode <= 0) return;
3831
3832         /*
3833          *      Merge pending signals.
3834          */
3835         for (i = 0; i < rcode; i++) {
3836                 buffer[0] |= buffer[i];
3837         }
3838
3839         handle_signal_self(buffer[0]);
3840 }
3841 #endif
3842
3843
3844 static void event_socket_handler(fr_event_list_t *xel, UNUSED int fd,
3845                                  void *ctx)
3846 {
3847         rad_listen_t *listener = ctx;
3848         RAD_REQUEST_FUNP fun;
3849         REQUEST *request;
3850
3851         rad_assert(xel == el);
3852
3853         xel = xel;
3854
3855         if (listener->fd < 0) rad_panic("Socket was closed on us!");
3856
3857         if (!listener->recv(listener, &fun, &request)) return;
3858
3859         if (!thread_pool_addrequest(request, fun)) {
3860                 request->child_state = REQUEST_DONE;
3861         }
3862 }
3863
3864
3865 /*
3866  *      This function is called periodically to see if this detail
3867  *      file is available for reading.
3868  */
3869 static void event_poll_detail(void *ctx)
3870 {
3871         int rcode, delay;
3872         RAD_REQUEST_FUNP fun;
3873         REQUEST *request;
3874         rad_listen_t *this = ctx;
3875         struct timeval when;
3876         listen_detail_t *detail = this->data;
3877
3878         rad_assert(this->type == RAD_LISTEN_DETAIL);
3879
3880         /*
3881          *      Try to read something.
3882          *
3883          *      FIXME: This does poll AND receive.
3884          */
3885         rcode = this->recv(this, &fun, &request);
3886         if (rcode != 0) {
3887                 rad_assert(fun != NULL);
3888                 rad_assert(request != NULL);
3889
3890                 if (!thread_pool_addrequest(request, fun)) {
3891                         request->child_state = REQUEST_DONE;
3892                 }
3893         }
3894
3895         fr_event_now(el, &now);
3896         when = now;
3897
3898         /*
3899          *      Backdoor API to get the delay until the next poll
3900          *      time.
3901          */
3902         delay = this->encode(this, NULL);
3903         tv_add(&when, delay);
3904
3905         if (!fr_event_insert(el, event_poll_detail, this,
3906                              &when, &detail->ev)) {
3907                 radlog(L_ERR, "Failed creating handler");
3908                 exit(1);
3909         }
3910 }
3911
3912
3913 static void event_status(struct timeval *wake)
3914 {
3915 #if !defined(HAVE_PTHREAD_H) && defined(WNOHANG)
3916         int argval;
3917 #endif
3918
3919         if (debug_flag == 0) {
3920                 if (just_started) {
3921                         radlog(L_INFO, "Ready to process requests.");
3922                         just_started = FALSE;
3923                 }
3924                 return;
3925         }
3926
3927         if (!wake) {
3928                 radlog(L_INFO, "Ready to process requests.");
3929
3930         } else if ((wake->tv_sec != 0) ||
3931                    (wake->tv_usec >= 100000)) {
3932                 DEBUG("Waking up in %d.%01u seconds.",
3933                       (int) wake->tv_sec, (unsigned int) wake->tv_usec / 100000);
3934         }
3935
3936
3937         /*
3938          *      FIXME: Put this somewhere else, where it isn't called
3939          *      all of the time...
3940          */
3941
3942 #if !defined(HAVE_PTHREAD_H) && defined(WNOHANG)
3943         /*
3944          *      If there are no child threads, then there may
3945          *      be child processes.  In that case, wait for
3946          *      their exit status, and throw that exit status
3947          *      away.  This helps get rid of zxombie children.
3948          */
3949         while (waitpid(-1, &argval, WNOHANG) > 0) {
3950                 /* do nothing */
3951         }
3952 #endif
3953
3954 }
3955
3956 /*
3957  *      Externally-visibly functions.
3958  */
3959 int radius_event_init(CONF_SECTION *cs, int spawn_flag)
3960 {
3961         rad_listen_t *head = NULL;
3962
3963         if (el) return 0;
3964
3965         time(&fr_start_time);
3966
3967         el = fr_event_list_create(event_status);
3968         if (!el) return 0;
3969
3970         pl = fr_packet_list_create(0);
3971         if (!pl) return 0;      /* leak el */
3972
3973         request_num_counter = 0;
3974
3975 #ifdef WITH_PROXY
3976         if (mainconfig.proxy_requests) {
3977                 /*
3978                  *      Create the tree for managing proxied requests and
3979                  *      responses.
3980                  */
3981                 proxy_list = fr_packet_list_create(1);
3982                 if (!proxy_list) return 0;
3983
3984 #ifdef HAVE_PTHREAD_H
3985                 if (pthread_mutex_init(&proxy_mutex, NULL) != 0) {
3986                         radlog(L_ERR, "FATAL: Failed to initialize proxy mutex: %s",
3987                                strerror(errno));
3988                         exit(1);
3989                 }
3990 #endif
3991         }
3992 #endif
3993
3994 #ifdef HAVE_PTHREAD_H
3995 #ifndef __MINGW32__
3996         NO_SUCH_CHILD_PID = (pthread_t ) (0);
3997 #else
3998         NO_SUCH_CHILD_PID = pthread_self(); /* not a child thread */
3999 #endif
4000         /*
4001          *      Initialize the threads ONLY if we're spawning, AND
4002          *      we're running normally.
4003          */
4004         if (spawn_flag && !check_config &&
4005             (thread_pool_init(cs, &spawn_flag) < 0)) {
4006                 exit(1);
4007         }
4008 #endif
4009
4010         /*
4011          *      Move all of the thread calls to this file?
4012          *
4013          *      It may be best for the mutexes to be in this file...
4014          */
4015         have_children = spawn_flag;
4016
4017         if (check_config) {
4018                 DEBUG("%s: #### Skipping IP addresses and Ports ####",
4019                        mainconfig.name);
4020                 return 1;
4021         }
4022
4023 #ifdef WITH_SELF_PIPE
4024         /*
4025          *      Child threads need a pipe to signal us, as do the
4026          *      signal handlers.
4027          */
4028         if (pipe(self_pipe) < 0) {
4029                 radlog(L_ERR, "radiusd: Error opening internal pipe: %s",
4030                        strerror(errno));
4031                 exit(1);
4032         }
4033         if (fcntl(self_pipe[0], F_SETFL, O_NONBLOCK | FD_CLOEXEC) < 0) {
4034                 radlog(L_ERR, "radiusd: Error setting internal flags: %s",
4035                        strerror(errno));
4036                 exit(1);
4037         }
4038         if (fcntl(self_pipe[1], F_SETFL, O_NONBLOCK | FD_CLOEXEC) < 0) {
4039                 radlog(L_ERR, "radiusd: Error setting internal flags: %s",
4040                        strerror(errno));
4041                 exit(1);
4042         }
4043
4044         if (!fr_event_fd_insert(el, 0, self_pipe[0],
4045                                   event_signal_handler, el)) {
4046                 radlog(L_ERR, "Failed creating handler for signals");
4047                 exit(1);
4048         }
4049 #endif  /* WITH_SELF_PIPE */
4050
4051        DEBUG("%s: #### Opening IP addresses and Ports ####",
4052                mainconfig.name);
4053
4054        /*
4055         *       The server temporarily switches to an unprivileged
4056         *       user very early in the bootstrapping process.
4057         *       However, some sockets MAY require privileged access
4058         *       (bind to device, or to port < 1024, or to raw
4059         *       sockets).  Those sockets need to call suid up/down
4060         *       themselves around the functions that need a privileged
4061         *       uid.
4062         */
4063         if (listen_init(cs, &head) < 0) {
4064                 _exit(1);
4065         }
4066
4067         mainconfig.listen = head;
4068
4069         /*
4070          *      At this point, no one has any business *ever* going
4071          *      back to root uid.
4072          */
4073         fr_suid_down_permanent();
4074
4075         return 1;
4076 }
4077
4078
4079 static int request_hash_cb(UNUSED void *ctx, void *data)
4080 {
4081         REQUEST *request = fr_packet2myptr(REQUEST, packet, data);
4082
4083 #ifdef WITH_PROXY
4084         rad_assert(request->in_proxy_hash == FALSE);
4085 #endif
4086
4087         ev_request_free(&request);
4088
4089         return 0;
4090 }
4091
4092
4093 #ifdef WITH_PROXY
4094 static int proxy_hash_cb(UNUSED void *ctx, void *data)
4095 {
4096         REQUEST *request = fr_packet2myptr(REQUEST, proxy, data);
4097
4098         ev_request_free(&request);
4099
4100         return 0;
4101 }
4102 #endif
4103
4104 void radius_event_free(void)
4105 {
4106         /*
4107          *      FIXME: Stop all threads, or at least check that
4108          *      they're all waiting on the semaphore, and the queues
4109          *      are empty.
4110          */
4111
4112 #ifdef WITH_PROXY
4113         /*
4114          *      There are requests in the proxy hash that aren't
4115          *      referenced from anywhere else.  Remove them first.
4116          */
4117         if (proxy_list) {
4118                 fr_packet_list_walk(proxy_list, NULL, proxy_hash_cb);
4119                 fr_packet_list_free(proxy_list);
4120                 proxy_list = NULL;
4121         }
4122 #endif
4123
4124         fr_packet_list_walk(pl, NULL, request_hash_cb);
4125
4126         fr_packet_list_free(pl);
4127         pl = NULL;
4128
4129         fr_event_list_free(el);
4130 }
4131
4132 int radius_event_process(void)
4133 {
4134         if (!el) return 0;
4135
4136         return fr_event_loop(el);
4137 }
4138
4139 void radius_handle_request(REQUEST *request, RAD_REQUEST_FUNP fun)
4140 {
4141         request->options = RAD_REQUEST_OPTION_DEBUG2;
4142
4143         if (request_pre_handler(request)) {
4144                 rad_assert(fun != NULL);
4145                 rad_assert(request != NULL);
4146
4147                 if (request->server) RDEBUG("server %s {",
4148                                             request->server != NULL ?
4149                                             request->server : "");
4150                 fun(request);
4151
4152                 if (request->server) RDEBUG("} # server %s",
4153                                              request->server != NULL ?
4154                                             request->server : "");
4155
4156                 request_post_handler(request);
4157         }
4158
4159         DEBUG2("Going to the next request");
4160         return;
4161 }