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 static void ev_request_free(REQUEST **prequest)
 167 {
 168         REQUEST *request;
 169
 170         if (!prequest || !*prequest) return;
 171
 172         request = *prequest;
 173
 174 #ifdef WITH_COA
 175         if (request->coa) {
 176                 /*
 177                  *      Divorce the child from the parent first,
 178                  *      then clean up the child.
 179                  */
 180                 request->coa->parent = NULL;
 181                 ev_request_free(&request->coa);
 182         }
 183
 184         /*
 185          *      Divorce the parent from the child, and leave the
 186          *      parent still alive.
 187          */
 188         if (request->parent && (request->parent->coa == request)) {
 189                 request->parent->coa = NULL;
 190         }
 191 #endif
 192
 193         if (request->ev) fr_event_delete(el, &request->ev);
 194 #ifdef WITH_PROXY
 195         if (request->in_proxy_hash) remove_from_proxy_hash(request);
 196 #endif
 197         if (request->in_request_hash) remove_from_request_hash(request);
 198
 199         request_free(prequest);
 200 }
 201
 202 #ifdef WITH_PROXY
 203 static REQUEST *lookup_in_proxy_hash(RADIUS_PACKET *reply)
 204 {
 205         int done = FALSE;
 206         RADIUS_PACKET **proxy_p;
 207         REQUEST *request;
 208
 209         PTHREAD_MUTEX_LOCK(&proxy_mutex);
 210         proxy_p = fr_packet_list_find_byreply(proxy_list, reply);
 211
 212         if (!proxy_p) {
 213                 PTHREAD_MUTEX_UNLOCK(&proxy_mutex);
 214                 return NULL;
 215         }
 216
 217         request = fr_packet2myptr(REQUEST, proxy, proxy_p);
 218         request->num_proxied_responses++; /* needs to be protected by lock */
 219
 220         done = (request->num_proxied_requests == request->num_proxied_responses);
 221         PTHREAD_MUTEX_UNLOCK(&proxy_mutex);
 222
 223
 224         /*
 225          *      Catch the most common case of everything working
 226          *      correctly.
 227          */
 228         if (done) remove_from_proxy_hash(request);
 229
 230         return request;
 231 }
 232
 233
 234 static void remove_from_proxy_hash(REQUEST *request)
 235 {
 236         /*
 237          *      Check this without grabbing the mutex because it's a
 238          *      lot faster that way.
 239          */
 240         if (!request->in_proxy_hash) return;
 241
 242         /*
 243          *      The "not in hash" flag is definitive.  However, if the
 244          *      flag says that it IS in the hash, there might still be
 245          *      a race condition where it isn't.
 246          */
 247         PTHREAD_MUTEX_LOCK(&proxy_mutex);
 248
 249         if (!request->in_proxy_hash) {
 250                 PTHREAD_MUTEX_UNLOCK(&proxy_mutex);
 251                 return;
 252         }
 253
 254         fr_packet_list_yank(proxy_list, request->proxy);
 255         fr_packet_list_id_free(proxy_list, request->proxy);
 256
 257         /*
 258          *      On the FIRST reply, decrement the count of outstanding
 259          *      requests.  Note that this is NOT the count of sent
 260          *      packets, but whether or not the home server has
 261          *      responded at all.
 262          */
 263         if (!request->proxy_reply &&
 264             request->home_server &&
 265             request->home_server->currently_outstanding) {
 266                 request->home_server->currently_outstanding--;
 267         }
 268
 269 #ifdef WITH_TCP
 270         request->proxy_listener->count--;
 271         request->proxy_listener = NULL;
 272 #endif
 273
 274         /*
 275          *      Got from YES in hash, to NO, not in hash while we hold
 276          *      the mutex.  This guarantees that when another thread
 277          *      grabs the mutex, the "not in hash" flag is correct.
 278          */
 279         request->in_proxy_hash = FALSE;
 280
 281         PTHREAD_MUTEX_UNLOCK(&proxy_mutex);
 282 }
 283 #endif  /* WITH_PROXY */
 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         stop_processing:
1257 #if defined(HAVE_PTHREAD_H)
1258                 /*
1259                  *      A child thread MAY still be running on the
1260                  *      request.  Ask the thread to stop working on
1261                  *      the request.
1262                  */
1263                 if (have_children &&
1264                     (pthread_equal(request->child_pid, NO_SUCH_CHILD_PID) == 0)) {
1265                         request->master_state = REQUEST_STOP_PROCESSING;
1266
1267                         radlog(L_ERR, "WARNING: Unresponsive child for request %u, in module %s component %s",
1268                                request->number,
1269                                request->module ? request->module : "<server core>",
1270                                request->component ? request->component : "<server core>");
1271
1272                         request->delay = USEC / 4;
1273                         tv_add(&request->when, request->delay);
1274                         callback = wait_for_child_to_die;
1275                         break;
1276                 }
1277 #endif
1278
1279                 /*
1280                  *      Else no child thread is processing the
1281                  *      request.  We probably should have just marked
1282                  *      the request as 'done' elsewhere, like in the
1283                  *      post-proxy-fail handler.  But doing that would
1284                  *      involve checking for max_request_time in
1285                  *      multiple places, so this may be simplest.
1286                  */
1287                 request->child_state = REQUEST_DONE;
1288                 /* FALL-THROUGH */
1289
1290                 /*
1291                  *      Mark the request as no longer running,
1292                  *      and clean it up.
1293                  */
1294         case REQUEST_DONE:
1295 #ifdef HAVE_PTHREAD_H
1296                 request->child_pid = NO_SUCH_CHILD_PID;
1297 #endif
1298
1299 #ifdef WITH_COA
1300                 /*
1301                  *      This is a CoA request.  It's been divorced
1302                  *      from everything else, so we clean it up now.
1303                  */
1304                 if (!request->in_request_hash &&
1305                     request->proxy &&
1306                     (request->packet->code != request->proxy->code) &&
1307                     ((request->proxy->code == PW_COA_REQUEST) ||
1308                      (request->proxy->code == PW_DISCONNECT_REQUEST))) {
1309                         /*
1310                          *      FIXME: Do CoA MIBs
1311                          */
1312                         ev_request_free(&request);
1313                         return;
1314                 }
1315 #endif
1316                 request_stats_final(request);
1317                 cleanup_delay(request);
1318                 return;
1319
1320         case REQUEST_REJECT_DELAY:
1321         case REQUEST_CLEANUP_DELAY:
1322 #ifdef HAVE_PTHREAD_H
1323                 request->child_pid = NO_SUCH_CHILD_PID;
1324 #endif
1325                 request_stats_final(request);
1326
1327         case REQUEST_PROXIED:
1328                 rad_assert(request->next_callback != NULL);
1329                 rad_assert(request->next_callback != wait_a_bit);
1330
1331                 request->when = request->next_when;
1332                 callback = request->next_callback;
1333                 request->next_callback = NULL;
1334                 break;
1335
1336         default:
1337                 rad_panic("Internal sanity check failure");
1338                 return;
1339         }
1340
1341         /*
1342          *      Something major went wrong.  Discard the request, and
1343          *      keep running.
1344          *
1345          *      FIXME: No idea why this happens or how to fix it...
1346          *      It seems to happen *only* when requests are proxied,
1347          *      and where the home server doesn't respond.  So it looks
1348          *      like a race condition above, but it happens in debug
1349          *      mode, with no threads...
1350          */
1351         if (!callback) {
1352                 RDEBUG("WARNING: Internal sanity check failed in event handler for request %u: Discarding the request!", request->number);
1353                 ev_request_free(&request);
1354                 return;
1355         }
1356
1357         INSERT_EVENT(callback, request);
1358 }
1359
1360 #ifdef WITH_COA
1361 static void no_response_to_coa_request(void *ctx)
1362 {
1363         REQUEST *request = ctx;
1364         char buffer[128];
1365
1366         rad_assert(request->magic == REQUEST_MAGIC);
1367         rad_assert(request->child_state == REQUEST_PROXIED);
1368         rad_assert(request->home_server != NULL);
1369         rad_assert(!request->in_request_hash);
1370
1371         radlog(L_ERR, "No response to CoA request sent to %s",
1372                inet_ntop(request->proxy->dst_ipaddr.af,
1373                          &request->proxy->dst_ipaddr.ipaddr,
1374                          buffer, sizeof(buffer)));
1375
1376         /*
1377          *      Hack.
1378          */
1379         request->packet->code |= (PW_COA_REQUEST << 8);
1380         post_proxy_fail_handler(request);
1381 }
1382
1383
1384 static int update_event_timestamp(RADIUS_PACKET *packet, time_t when)
1385 {
1386         VALUE_PAIR *vp;
1387
1388         vp = pairfind(packet->vps, PW_EVENT_TIMESTAMP);
1389         if (!vp) return 0;
1390
1391         vp->vp_date = when;
1392
1393         if (packet->data) {
1394                 free(packet->data);
1395                 packet->data = NULL;
1396                 packet->data_len = 0;
1397         }
1398
1399         return 1;               /* time stamp updated */
1400 }
1401
1402
1403 /*
1404  *      Called when we haven't received a response to a CoA request.
1405  */
1406 static void retransmit_coa_request(void *ctx)
1407 {
1408         int delay, frac;
1409         struct timeval mrd;
1410         REQUEST *request = ctx;
1411
1412         rad_assert(request->magic == REQUEST_MAGIC);
1413         rad_assert(request->child_state == REQUEST_PROXIED);
1414         rad_assert(request->home_server != NULL);
1415         rad_assert(!request->in_request_hash);
1416         rad_assert(request->parent == NULL);
1417
1418         fr_event_now(el, &now);
1419
1420         /*
1421          *      Cap count at MRC, if it is non-zero.
1422          */
1423         if (request->home_server->coa_mrc &&
1424             (request->num_coa_requests >= request->home_server->coa_mrc)) {
1425                 no_response_to_coa_request(request);
1426                 return;
1427         }
1428
1429         /*
1430          *      RFC 5080 Section 2.2.1
1431          *
1432          *      RT = 2*RTprev + RAND*RTprev
1433          *         = 1.9 * RTprev + rand(0,.2) * RTprev
1434          *         = 1.9 * RTprev + rand(0,1) * (RTprev / 5)
1435          */
1436         delay = fr_rand();
1437         delay ^= (delay >> 16);
1438         delay &= 0xffff;
1439         frac = request->delay / 5;
1440         delay = ((frac >> 16) * delay) + (((frac & 0xffff) * delay) >> 16);
1441
1442         delay += (2 * request->delay) - (request->delay / 10);
1443
1444         /*
1445          *      Cap delay at MRT, if MRT is non-zero.
1446          */
1447         if (request->home_server->coa_mrt &&
1448             (delay > (request->home_server->coa_mrt * USEC))) {
1449                 int mrt_usec = request->home_server->coa_mrt * USEC;
1450
1451                 /*
1452                  *      delay = MRT + RAND * MRT
1453                  *            = 0.9 MRT + rand(0,.2)  * MRT
1454                  */
1455                 delay = fr_rand();
1456                 delay ^= (delay >> 15);
1457                 delay &= 0x1ffff;
1458                 delay = ((mrt_usec >> 16) * delay) + (((mrt_usec & 0xffff) * delay) >> 16);
1459                 delay += mrt_usec - (mrt_usec / 10);
1460         }
1461
1462         request->delay = delay;
1463         request->when = now;
1464         tv_add(&request->when, request->delay);
1465         mrd = request->proxy_when;
1466         mrd.tv_sec += request->home_server->coa_mrd;
1467
1468         /*
1469          *      Cap duration at MRD.
1470          */
1471         if (timercmp(&mrd, &request->when, <)) {
1472                 request->when = mrd;
1473                 INSERT_EVENT(no_response_to_coa_request, request);
1474
1475         } else {
1476                 INSERT_EVENT(retransmit_coa_request, request);
1477         }
1478
1479         if (update_event_timestamp(request->proxy, now.tv_sec)) {
1480                 /*
1481                  *      Keep a copy of the old Id so that the
1482                  *      re-transmitted request doesn't re-use the old
1483                  *      Id.
1484                  */
1485                 RADIUS_PACKET old = *request->proxy;
1486
1487                 /*
1488                  *      Don't free the old Id on error.
1489                  */
1490                 if (!insert_into_proxy_hash(request)) {
1491                         radlog(L_PROXY,"Failed re-inserting CoA request into proxy hash.");
1492                         return;
1493                 }
1494
1495                 /*
1496                  *      Now that we have a new Id, free the old one.
1497                  */
1498                 PTHREAD_MUTEX_LOCK(&proxy_mutex);
1499                 fr_packet_list_yank(proxy_list, &old);
1500                 fr_packet_list_id_free(proxy_list, &old);
1501                 PTHREAD_MUTEX_UNLOCK(&proxy_mutex);
1502
1503                 request->num_proxied_requests = 0;
1504                 request->num_proxied_responses = 0;
1505         }
1506
1507         request->num_proxied_requests++;
1508         request->num_coa_requests++; /* is NOT reset by code 3 lines above! */
1509
1510         request->proxy_listener->send(request->proxy_listener,
1511                                       request);
1512 }
1513
1514
1515 /*
1516  *      The original request is either DONE, or in CLEANUP_DELAY.
1517  */
1518 static int originated_coa_request(REQUEST *request)
1519 {
1520         int delay, rcode, pre_proxy_type = 0;
1521         VALUE_PAIR *vp;
1522         REQUEST *coa;
1523         fr_ipaddr_t ipaddr;
1524         char buffer[256];
1525
1526         rad_assert(request->proxy == NULL);
1527         rad_assert(!request->in_proxy_hash);
1528         rad_assert(request->proxy_reply == NULL);
1529
1530         /*
1531          *      Check whether we want to originate one, or cancel one.
1532          */
1533         vp = pairfind(request->config_items, PW_SEND_COA_REQUEST);
1534         if (!vp && request->coa) {
1535                 vp = pairfind(request->coa->proxy->vps, PW_SEND_COA_REQUEST);
1536         }
1537
1538         if (vp) {
1539                 if (vp->vp_integer == 0) {
1540                         ev_request_free(&request->coa);
1541                         return 1;       /* success */
1542                 }
1543         }
1544
1545         if (!request->coa) request_alloc_coa(request);
1546         if (!request->coa) return 0;
1547
1548         coa = request->coa;
1549
1550         /*
1551          *      src_ipaddr will be set up in proxy_encode.
1552          */
1553         memset(&ipaddr, 0, sizeof(ipaddr));
1554         vp = pairfind(coa->proxy->vps, PW_PACKET_DST_IP_ADDRESS);
1555         if (vp) {
1556                 ipaddr.af = AF_INET;
1557                 ipaddr.ipaddr.ip4addr.s_addr = vp->vp_ipaddr;
1558
1559         } else if ((vp = pairfind(coa->proxy->vps,
1560                                   PW_PACKET_DST_IPV6_ADDRESS)) != NULL) {
1561                 ipaddr.af = AF_INET6;
1562                 ipaddr.ipaddr.ip6addr = vp->vp_ipv6addr;
1563
1564         } else if ((vp = pairfind(coa->proxy->vps,
1565                                   PW_HOME_SERVER_POOL)) != NULL) {
1566                 coa->home_pool = home_pool_byname(vp->vp_strvalue,
1567                                                   HOME_TYPE_COA);
1568                 if (!coa->home_pool) {
1569                         RDEBUG2("WARNING: No such home_server_pool %s",
1570                                vp->vp_strvalue);
1571         fail:
1572                         ev_request_free(&request->coa);
1573                         return 0;
1574                 }
1575
1576                 /*
1577                  *      Prefer
1578                  */
1579         } else if (request->client->coa_pool) {
1580                 coa->home_pool = request->client->coa_pool;
1581
1582         } else if (request->client->coa_server) {
1583                 coa->home_server = request->client->coa_server;
1584
1585         } else {
1586                 /*
1587                  *      If all else fails, send it to the client that
1588                  *      originated this request.
1589                  */
1590                 memcpy(&ipaddr, &request->packet->src_ipaddr, sizeof(ipaddr));
1591         }
1592
1593         /*
1594          *      Use the pool, if it exists.
1595          */
1596         if (coa->home_pool) {
1597                 coa->home_server = home_server_ldb(NULL, coa->home_pool, coa);
1598                 if (!coa->home_server) {
1599                         RDEBUG("WARNING: No live home server for home_server_pool %s", vp->vp_strvalue);
1600                         goto fail;
1601                 }
1602
1603         } else if (!coa->home_server) {
1604                 int port = PW_COA_UDP_PORT;
1605
1606                 vp = pairfind(coa->proxy->vps, PW_PACKET_DST_PORT);
1607                 if (vp) port = vp->vp_integer;
1608
1609                 coa->home_server = home_server_find(&ipaddr, port, IPPROTO_UDP);
1610                 if (!coa->home_server) {
1611                         RDEBUG2("WARNING: Unknown destination %s:%d for CoA request.",
1612                                inet_ntop(ipaddr.af, &ipaddr.ipaddr,
1613                                          buffer, sizeof(buffer)), port);
1614                         goto fail;
1615                 }
1616         }
1617
1618         vp = pairfind(coa->proxy->vps, PW_PACKET_TYPE);
1619         if (vp) {
1620                 switch (vp->vp_integer) {
1621                 case PW_COA_REQUEST:
1622                 case PW_DISCONNECT_REQUEST:
1623                         coa->proxy->code = vp->vp_integer;
1624                         break;
1625
1626                 default:
1627                         DEBUG("Cannot set CoA Packet-Type to code %d",
1628                               vp->vp_integer);
1629                         goto fail;
1630                 }
1631         }
1632
1633         if (!coa->proxy->code) coa->proxy->code = PW_COA_REQUEST;
1634
1635         /*
1636          *      The rest of the server code assumes that
1637          *      request->packet && request->reply exist.  Copy them
1638          *      from the original request.
1639          */
1640         rad_assert(coa->packet != NULL);
1641         rad_assert(coa->packet->vps == NULL);
1642         memcpy(coa->packet, request->packet, sizeof(*request->packet));
1643         coa->packet->vps = paircopy(request->packet->vps);
1644         coa->packet->data = NULL;
1645         rad_assert(coa->reply != NULL);
1646         rad_assert(coa->reply->vps == NULL);
1647         memcpy(coa->reply, request->reply, sizeof(*request->reply));
1648         coa->reply->vps = paircopy(request->reply->vps);
1649         coa->reply->data = NULL;
1650         coa->config_items = paircopy(request->config_items);
1651
1652         /*
1653          *      Call the pre-proxy routines.
1654          */
1655         vp = pairfind(request->config_items, PW_PRE_PROXY_TYPE);
1656         if (vp) {
1657                 RDEBUG2("  Found Pre-Proxy-Type %s", vp->vp_strvalue);
1658                 pre_proxy_type = vp->vp_integer;
1659         }
1660
1661         if (coa->home_pool && coa->home_pool->virtual_server) {
1662                 const char *old_server = coa->server;
1663
1664                 coa->server = coa->home_pool->virtual_server;
1665                 RDEBUG2(" server %s {", coa->server);
1666                 rcode = module_pre_proxy(pre_proxy_type, coa);
1667                 RDEBUG2(" }");
1668                 coa->server = old_server;
1669         } else {
1670                 rcode = module_pre_proxy(pre_proxy_type, coa);
1671         }
1672         switch (rcode) {
1673         default:
1674                 goto fail;
1675
1676         /*
1677          *      Only send the CoA packet if the pre-proxy code succeeded.
1678          */
1679         case RLM_MODULE_NOOP:
1680         case RLM_MODULE_OK:
1681         case RLM_MODULE_UPDATED:
1682                 break;
1683         }
1684
1685         /*
1686          *      Source IP / port is set when the proxy socket
1687          *      is chosen.
1688          */
1689         coa->proxy->dst_ipaddr = coa->home_server->ipaddr;
1690         coa->proxy->dst_port = coa->home_server->port;
1691
1692         if (!insert_into_proxy_hash(coa)) {
1693                 radlog(L_PROXY, "Failed inserting CoA request into proxy hash.");
1694                 goto fail;
1695         }
1696
1697         /*
1698          *      We CANNOT divorce the CoA request from the parent
1699          *      request.  This function is running in a child thread,
1700          *      and we need access to the main event loop in order to
1701          *      to add the timers for the CoA packet.  See
1702          *      wait_a_bit().
1703          */
1704
1705         /*
1706          *      Forget about the original request completely at this
1707          *      point.
1708          */
1709         request = coa;
1710
1711         gettimeofday(&request->proxy_when, NULL);
1712         request->received = request->next_when = request->proxy_when;
1713         rad_assert(request->proxy_reply == NULL);
1714
1715         /*
1716          *      Implement re-transmit algorithm as per RFC 5080
1717          *      Section 2.2.1.
1718          *
1719          *      We want IRT + RAND*IRT
1720          *      or 0.9 IRT + rand(0,.2) IRT
1721          *
1722          *      2^20 ~ USEC, and we want 2.
1723          *      rand(0,0.2) USEC ~ (rand(0,2^21) / 10)
1724          */
1725         delay = (fr_rand() & ((1 << 22) - 1)) / 10;
1726         request->delay = delay * request->home_server->coa_irt;
1727         delay = request->home_server->coa_irt * USEC;
1728         delay -= delay / 10;
1729         delay += request->delay;
1730
1731         request->delay = delay;
1732         tv_add(&request->next_when, delay);
1733         request->next_callback = retransmit_coa_request;
1734
1735         /*
1736          *      Note that we set proxied BEFORE sending the packet.
1737          *
1738          *      Once we send it, the request is tainted, as
1739          *      another thread may have picked it up.  Don't
1740          *      touch it!
1741          */
1742         request->num_proxied_requests = 1;
1743         request->num_proxied_responses = 0;
1744         request->child_pid = NO_SUCH_CHILD_PID;
1745
1746         update_event_timestamp(request->proxy, request->proxy_when.tv_sec);
1747
1748         request->child_state = REQUEST_PROXIED;
1749
1750         DEBUG_PACKET(request, request->proxy, 1);
1751
1752         request->proxy_listener->send(request->proxy_listener,
1753                                       request);
1754         return 1;
1755 }
1756 #endif  /* WITH_COA */
1757
1758 #ifdef WITH_PROXY
1759 static int process_proxy_reply(REQUEST *request)
1760 {
1761         int rcode;
1762         int post_proxy_type = 0;
1763         VALUE_PAIR *vp;
1764
1765         /*
1766          *      Delete any reply we had accumulated until now.
1767          */
1768         pairfree(&request->reply->vps);
1769
1770         /*
1771          *      Run the packet through the post-proxy stage,
1772          *      BEFORE playing games with the attributes.
1773          */
1774         vp = pairfind(request->config_items, PW_POST_PROXY_TYPE);
1775         if (vp) {
1776                 RDEBUG2("  Found Post-Proxy-Type %s", vp->vp_strvalue);
1777                 post_proxy_type = vp->vp_integer;
1778         }
1779
1780         if (request->home_pool && request->home_pool->virtual_server) {
1781                 const char *old_server = request->server;
1782
1783                 request->server = request->home_pool->virtual_server;
1784                 RDEBUG2(" server %s {", request->server);
1785                 rcode = module_post_proxy(post_proxy_type, request);
1786                 RDEBUG2(" }");
1787                 request->server = old_server;
1788         } else {
1789                 rcode = module_post_proxy(post_proxy_type, request);
1790         }
1791
1792 #ifdef WITH_COA
1793         if (request->packet->code == request->proxy->code)
1794           /*
1795            *    Don't run the next bit if we originated a CoA
1796            *    packet, after receiving an Access-Request or
1797            *    Accounting-Request.
1798            */
1799 #endif
1800
1801         /*
1802          *      There may NOT be a proxy reply, as we may be
1803          *      running Post-Proxy-Type = Fail.
1804          */
1805         if (request->proxy_reply) {
1806                 /*
1807                  *      Delete the Proxy-State Attributes from
1808                  *      the reply.  These include Proxy-State
1809                  *      attributes from us and remote server.
1810                  */
1811                 pairdelete(&request->proxy_reply->vps, PW_PROXY_STATE);
1812
1813                 /*
1814                  *      Add the attributes left in the proxy
1815                  *      reply to the reply list.
1816                  */
1817                 pairadd(&request->reply->vps, request->proxy_reply->vps);
1818                 request->proxy_reply->vps = NULL;
1819
1820                 /*
1821                  *      Free proxy request pairs.
1822                  */
1823                 pairfree(&request->proxy->vps);
1824         }
1825
1826         switch (rcode) {
1827         default:  /* Don't do anything */
1828                 break;
1829         case RLM_MODULE_FAIL:
1830                 /* FIXME: debug print stuff */
1831                 request->child_state = REQUEST_DONE;
1832                 return 0;
1833
1834         case RLM_MODULE_HANDLED:
1835                 /* FIXME: debug print stuff */
1836                 request->child_state = REQUEST_DONE;
1837                 return 0;
1838         }
1839
1840         return 1;
1841 }
1842 #endif
1843
1844 static int request_pre_handler(REQUEST *request)
1845 {
1846         int rcode;
1847
1848         rad_assert(request->magic == REQUEST_MAGIC);
1849         rad_assert(request->packet != NULL);
1850
1851         request->child_state = REQUEST_RUNNING;
1852
1853         /*
1854          *      Don't decode the packet if it's an internal "fake"
1855          *      request.  Instead, just return so that the caller can
1856          *      process it.
1857          */
1858         if (request->packet->dst_port == 0) {
1859                 request->username = pairfind(request->packet->vps,
1860                                              PW_USER_NAME);
1861                 request->password = pairfind(request->packet->vps,
1862                                              PW_USER_PASSWORD);
1863                 return 1;
1864         }
1865
1866 #ifdef WITH_PROXY
1867         /*
1868          *      Put the decoded packet into it's proper place.
1869          */
1870         if (request->proxy_reply != NULL) {
1871                 /*
1872                  *      FIXME: For now, we can only proxy RADIUS packets.
1873                  *
1874                  *      In order to proxy other packets, we need to
1875                  *      somehow cache the "decode" function.
1876                  */
1877                 rcode = rad_decode(request->proxy_reply, request->proxy,
1878                                    request->home_server->secret);
1879                 DEBUG_PACKET(request, request->proxy_reply, 0);
1880         } else
1881 #endif
1882         if (request->packet->vps == NULL) {
1883                 rcode = request->listener->decode(request->listener, request);
1884
1885                 if (debug_condition) {
1886                         int result = FALSE;
1887                         const char *my_debug = debug_condition;
1888
1889                         /*
1890                          *      Ignore parse errors.
1891                          */
1892                         radius_evaluate_condition(request, RLM_MODULE_OK, 0,
1893                                                   &my_debug, 1,
1894                                                   &result);
1895                         if (result) {
1896                                 request->options = 2;
1897                                 request->radlog = radlog_request;
1898                         }
1899                 }
1900
1901                 DEBUG_PACKET(request, request->packet, 0);
1902         } else {
1903                 rcode = 0;
1904         }
1905
1906         if (rcode < 0) {
1907                 RDEBUG("%s Dropping packet without response.", fr_strerror());
1908                 request->reply->offset = -2; /* bad authenticator */
1909                 request->child_state = REQUEST_DONE;
1910                 return 0;
1911         }
1912
1913         if (!request->username) {
1914                 request->username = pairfind(request->packet->vps,
1915                                              PW_USER_NAME);
1916         }
1917
1918 #ifdef WITH_PROXY
1919         if (request->proxy) {
1920                 return process_proxy_reply(request);
1921 #endif
1922         }
1923
1924         return 1;
1925 }
1926
1927
1928 #ifdef WITH_PROXY
1929 /*
1930  *      Do state handling when we proxy a request.
1931  */
1932 static int proxy_request(REQUEST *request)
1933 {
1934         struct timeval when;
1935         char buffer[128];
1936
1937 #ifdef WITH_COA
1938         if (request->coa) {
1939                 RDEBUG("WARNING: Cannot proxy and originate CoA packets at the same time.  Cancelling CoA request");
1940                 ev_request_free(&request->coa);
1941         }
1942 #endif
1943
1944         if (request->home_server->server) {
1945                 RDEBUG("ERROR: Cannot perform real proxying to a virtual server.");
1946                 return 0;
1947         }
1948
1949         if (!insert_into_proxy_hash(request)) {
1950                 radlog(L_PROXY, "Failed inserting request into proxy hash.");
1951                 return 0;
1952         }
1953
1954         request->proxy_listener->encode(request->proxy_listener, request);
1955
1956         when = request->received;
1957         when.tv_sec += request->root->max_request_time;
1958
1959         gettimeofday(&request->proxy_when, NULL);
1960
1961         request->next_when = request->proxy_when;
1962         request->next_when.tv_sec += request->home_server->response_window;
1963
1964         rad_assert(request->home_server->response_window > 0);
1965
1966         if (timercmp(&when, &request->next_when, <)) {
1967                 request->next_when = when;
1968         }
1969         request->next_callback = no_response_to_proxied_request;
1970
1971         RDEBUG2("Proxying request %u to home server %s port %d",
1972                request->number,
1973                inet_ntop(request->proxy->dst_ipaddr.af,
1974                          &request->proxy->dst_ipaddr.ipaddr,
1975                          buffer, sizeof(buffer)),
1976                 request->proxy->dst_port);
1977
1978         /*
1979          *      Note that we set proxied BEFORE sending the packet.
1980          *
1981          *      Once we send it, the request is tainted, as
1982          *      another thread may have picked it up.  Don't
1983          *      touch it!
1984          */
1985         request->num_proxied_requests = 1;
1986         request->num_proxied_responses = 0;
1987 #ifdef HAVE_PTHREAD_H
1988         request->child_pid = NO_SUCH_CHILD_PID;
1989 #endif
1990         request->child_state = REQUEST_PROXIED;
1991
1992         DEBUG_PACKET(request, request->proxy, 1);
1993
1994         request->proxy_listener->send(request->proxy_listener,
1995                                       request);
1996         return 1;
1997 }
1998
1999
2000 /*
2001  *      "Proxy" the request by sending it to a new virtual server.
2002  */
2003 static int proxy_to_virtual_server(REQUEST *request)
2004 {
2005         REQUEST *fake;
2006         RAD_REQUEST_FUNP fun;
2007
2008         if (!request->home_server || !request->home_server->server) return 0;
2009
2010         if (request->parent) {
2011                 RDEBUG2("WARNING: Cancelling proxy request to virtual server %s as this request was itself proxied.", request->home_server->server);
2012                 return 0;
2013         }
2014
2015         fake = request_alloc_fake(request);
2016         if (!fake) {
2017                 RDEBUG2("WARNING: Out of memory");
2018                 return 0;
2019         }
2020
2021         fake->packet->vps = paircopy(request->proxy->vps);
2022         fake->server = request->home_server->server;
2023
2024         if (request->proxy->code == PW_AUTHENTICATION_REQUEST) {
2025                 fun = rad_authenticate;
2026
2027 #ifdef WITH_ACCOUNTING
2028         } else if (request->proxy->code == PW_ACCOUNTING_REQUEST) {
2029                 fun = rad_accounting;
2030 #endif
2031
2032         } else {
2033                 RDEBUG2("Unknown packet type %d", request->proxy->code);
2034                 ev_request_free(&fake);
2035                 return 0;
2036         }
2037
2038         RDEBUG2(">>> Sending proxied request internally to virtual server.");
2039         radius_handle_request(fake, fun);
2040         RDEBUG2("<<< Received proxied response code %d from internal virtual server.", fake->reply->code);
2041
2042         if (fake->reply->code != 0) {
2043                 request->proxy_reply = fake->reply;
2044                 fake->reply = NULL;
2045         } else {
2046                 /*
2047                  *      There was no response
2048                  */
2049                 setup_post_proxy_fail(request);
2050         }
2051
2052         ev_request_free(&fake);
2053
2054         process_proxy_reply(request);
2055
2056         /*
2057          *      Process it through the normal section again, but ONLY
2058          *      if we received a proxy reply..
2059          */
2060         if (request->proxy_reply) {
2061                 if (request->server) RDEBUG("server %s {",
2062                                             request->server != NULL ?
2063                                             request->server : "");
2064                 fun(request);
2065
2066                 if (request->server) RDEBUG("} # server %s",
2067                                             request->server != NULL ?
2068                                             request->server : "");
2069         }
2070
2071         return 2;               /* success, but NOT '1' !*/
2072 }
2073
2074 /*
2075  *      Return 1 if we did proxy it, or the proxy attempt failed
2076  *      completely.  Either way, the caller doesn't touch the request
2077  *      any more if we return 1.
2078  */
2079 static int successfully_proxied_request(REQUEST *request)
2080 {
2081         int rcode;
2082         int pre_proxy_type = 0;
2083         VALUE_PAIR *realmpair;
2084         VALUE_PAIR *strippedname;
2085         VALUE_PAIR *vp;
2086         char *realmname = NULL;
2087         home_server *home;
2088         REALM *realm = NULL;
2089         home_pool_t *pool;
2090
2091         /*
2092          *      If it was already proxied, do nothing.
2093          *
2094          *      FIXME: This should really be a serious error.
2095          */
2096         if (request->in_proxy_hash ||
2097             (request->proxy_reply && (request->proxy_reply->code != 0))) {
2098                 return 0;
2099         }
2100
2101         realmpair = pairfind(request->config_items, PW_PROXY_TO_REALM);
2102         if (!realmpair || (realmpair->length == 0)) {
2103                 int pool_type;
2104
2105                 vp = pairfind(request->config_items, PW_HOME_SERVER_POOL);
2106                 if (!vp) return 0;
2107
2108                 switch (request->packet->code) {
2109                 case PW_AUTHENTICATION_REQUEST:
2110                         pool_type = HOME_TYPE_AUTH;
2111                         break;
2112
2113 #ifdef WITH_ACCOUNTING
2114                 case PW_ACCOUNTING_REQUEST:
2115                         pool_type = HOME_TYPE_ACCT;
2116                         break;
2117 #endif
2118
2119 #ifdef WITH_COA
2120                 case PW_COA_REQUEST:
2121                 case PW_DISCONNECT_REQUEST:
2122                         pool_type = HOME_TYPE_COA;
2123                         break;
2124 #endif
2125
2126                 default:
2127                         return 0;
2128                 }
2129
2130                 pool = home_pool_byname(vp->vp_strvalue, pool_type);
2131                 if (!pool) {
2132                         RDEBUG2("ERROR: Cannot proxy to unknown pool %s",
2133                                 vp->vp_strvalue);
2134                         return 0;
2135                 }
2136
2137                 realmname = NULL; /* no realms */
2138                 realm = NULL;
2139                 goto found_pool;
2140         }
2141
2142         realmname = (char *) realmpair->vp_strvalue;
2143
2144         realm = realm_find2(realmname);
2145         if (!realm) {
2146                 RDEBUG2("ERROR: Cannot proxy to unknown realm %s", realmname);
2147                 return 0;
2148         }
2149
2150         /*
2151          *      Figure out which pool to use.
2152          */
2153         if (request->packet->code == PW_AUTHENTICATION_REQUEST) {
2154                 pool = realm->auth_pool;
2155
2156 #ifdef WITH_ACCOUNTING
2157         } else if (request->packet->code == PW_ACCOUNTING_REQUEST) {
2158                 pool = realm->acct_pool;
2159 #endif
2160
2161 #ifdef WITH_COA
2162         } else if ((request->packet->code == PW_COA_REQUEST) ||
2163                    (request->packet->code == PW_DISCONNECT_REQUEST)) {
2164                 pool = realm->acct_pool;
2165 #endif
2166
2167         } else {
2168                 rad_panic("Internal sanity check failed");
2169         }
2170
2171         if (!pool) {
2172                 RDEBUG2(" WARNING: Cancelling proxy to Realm %s, as the realm is local.",
2173                        realmname);
2174                 return 0;
2175         }
2176
2177 found_pool:
2178         home = home_server_ldb(realmname, pool, request);
2179         if (!home) {
2180                 RDEBUG2("ERROR: Failed to find live home server for realm %s",
2181                        realmname);
2182                 return -1;
2183         }
2184         request->home_pool = pool;
2185
2186 #ifdef WITH_COA
2187         /*
2188          *      Once we've decided to proxy a request, we cannot send
2189          *      a CoA packet.  So we free up any CoA packet here.
2190          */
2191         ev_request_free(&request->coa);
2192 #endif
2193         /*
2194          *      Remember that we sent the request to a Realm.
2195          */
2196         if (realmname) pairadd(&request->packet->vps,
2197                                pairmake("Realm", realmname, T_OP_EQ));
2198
2199         /*
2200          *      Strip the name, if told to.
2201          *
2202          *      Doing it here catches the case of proxied tunneled
2203          *      requests.
2204          */
2205         if (realm && (realm->striprealm == TRUE) &&
2206            (strippedname = pairfind(request->proxy->vps, PW_STRIPPED_USER_NAME)) != NULL) {
2207                 /*
2208                  *      If there's a Stripped-User-Name attribute in
2209                  *      the request, then use THAT as the User-Name
2210                  *      for the proxied request, instead of the
2211                  *      original name.
2212                  *
2213                  *      This is done by making a copy of the
2214                  *      Stripped-User-Name attribute, turning it into
2215                  *      a User-Name attribute, deleting the
2216                  *      Stripped-User-Name and User-Name attributes
2217                  *      from the vps list, and making the new
2218                  *      User-Name the head of the vps list.
2219                  */
2220                 vp = pairfind(request->proxy->vps, PW_USER_NAME);
2221                 if (!vp) {
2222                         vp = radius_paircreate(request, NULL,
2223                                                PW_USER_NAME, PW_TYPE_STRING);
2224                         rad_assert(vp != NULL); /* handled by above function */
2225                         /* Insert at the START of the list */
2226                         vp->next = request->proxy->vps;
2227                         request->proxy->vps = vp;
2228                 }
2229                 memcpy(vp->vp_strvalue, strippedname->vp_strvalue,
2230                        sizeof(vp->vp_strvalue));
2231                 vp->length = strippedname->length;
2232
2233                 /*
2234                  *      Do NOT delete Stripped-User-Name.
2235                  */
2236         }
2237
2238         /*
2239          *      If there is no PW_CHAP_CHALLENGE attribute but
2240          *      there is a PW_CHAP_PASSWORD we need to add it
2241          *      since we can't use the request authenticator
2242          *      anymore - we changed it.
2243          */
2244         if ((request->packet->code == PW_AUTHENTICATION_REQUEST) &&
2245             pairfind(request->proxy->vps, PW_CHAP_PASSWORD) &&
2246             pairfind(request->proxy->vps, PW_CHAP_CHALLENGE) == NULL) {
2247                 vp = radius_paircreate(request, &request->proxy->vps,
2248                                        PW_CHAP_CHALLENGE, PW_TYPE_OCTETS);
2249                 vp->length = AUTH_VECTOR_LEN;
2250                 memcpy(vp->vp_strvalue, request->packet->vector, AUTH_VECTOR_LEN);
2251         }
2252
2253         /*
2254          *      The RFC's say we have to do this, but FreeRADIUS
2255          *      doesn't need it.
2256          */
2257         vp = radius_paircreate(request, &request->proxy->vps,
2258                                PW_PROXY_STATE, PW_TYPE_OCTETS);
2259         snprintf(vp->vp_strvalue, sizeof(vp->vp_strvalue), "%d",
2260                  request->packet->id);
2261         vp->length = strlen(vp->vp_strvalue);
2262
2263         /*
2264          *      Should be done BEFORE inserting into proxy hash, as
2265          *      pre-proxy may use this information, or change it.
2266          */
2267         request->proxy->code = request->packet->code;
2268
2269         /*
2270          *      Call the pre-proxy routines.
2271          */
2272         vp = pairfind(request->config_items, PW_PRE_PROXY_TYPE);
2273         if (vp) {
2274                 RDEBUG2("  Found Pre-Proxy-Type %s", vp->vp_strvalue);
2275                 pre_proxy_type = vp->vp_integer;
2276         }
2277
2278         rad_assert(request->home_pool != NULL);
2279
2280         if (request->home_pool->virtual_server) {
2281                 const char *old_server = request->server;
2282
2283                 request->server = request->home_pool->virtual_server;
2284                 RDEBUG2(" server %s {", request->server);
2285                 rcode = module_pre_proxy(pre_proxy_type, request);
2286                 RDEBUG2(" }");
2287                         request->server = old_server;
2288         } else {
2289                 rcode = module_pre_proxy(pre_proxy_type, request);
2290         }
2291         switch (rcode) {
2292         case RLM_MODULE_FAIL:
2293         case RLM_MODULE_INVALID:
2294         case RLM_MODULE_NOTFOUND:
2295         case RLM_MODULE_USERLOCK:
2296         default:
2297                 /* FIXME: debug print failed stuff */
2298                 return -1;
2299
2300         case RLM_MODULE_REJECT:
2301         case RLM_MODULE_HANDLED:
2302                 return 0;
2303
2304         /*
2305          *      Only proxy the packet if the pre-proxy code succeeded.
2306          */
2307         case RLM_MODULE_NOOP:
2308         case RLM_MODULE_OK:
2309         case RLM_MODULE_UPDATED:
2310                 break;
2311         }
2312
2313         /*
2314          *      If it's a fake request, don't send the proxy
2315          *      packet.  The outer tunnel session will take
2316          *      care of doing that.
2317          */
2318         if (request->packet->dst_port == 0) {
2319                 request->home_server = NULL;
2320                 return 1;
2321         }
2322
2323         if (request->home_server->server) {
2324                 return proxy_to_virtual_server(request);
2325         }
2326
2327         if (!proxy_request(request)) {
2328                 RDEBUG("ERROR: Failed to proxy request %u", request->number);
2329                 return -1;
2330         }
2331
2332         return 1;
2333 }
2334 #endif
2335
2336 static void request_post_handler(REQUEST *request)
2337 {
2338         int child_state = -1;
2339         struct timeval when;
2340         VALUE_PAIR *vp;
2341
2342         if ((request->master_state == REQUEST_STOP_PROCESSING) ||
2343             (request->parent &&
2344              (request->parent->master_state == REQUEST_STOP_PROCESSING))) {
2345                 RDEBUG2("request %u was cancelled.", request->number);
2346 #ifdef HAVE_PTHREAD_H
2347                 request->child_pid = NO_SUCH_CHILD_PID;
2348 #endif
2349                 child_state = REQUEST_DONE;
2350                 goto cleanup;
2351         }
2352
2353         if (request->child_state != REQUEST_RUNNING) {
2354                 rad_panic("Internal sanity check failed");
2355         }
2356
2357 #ifdef WITH_COA
2358         /*
2359          *      If it's not in the request hash, it's a CoA request.
2360          *      We hope.
2361          */
2362         if (!request->in_request_hash &&
2363             request->proxy &&
2364             ((request->proxy->code == PW_COA_REQUEST) ||
2365              (request->proxy->code == PW_DISCONNECT_REQUEST))) {
2366                 request->next_callback = NULL;
2367                 child_state = REQUEST_DONE;
2368                 goto cleanup;
2369         }
2370 #endif
2371
2372         /*
2373          *      Catch Auth-Type := Reject BEFORE proxying the packet.
2374          */
2375         if ((request->packet->code == PW_AUTHENTICATION_REQUEST) &&
2376             (request->reply->code == 0) &&
2377             ((vp = pairfind(request->config_items, PW_AUTH_TYPE)) != NULL) &&
2378             (vp->vp_integer == PW_AUTHTYPE_REJECT)) {
2379                 request->reply->code = PW_AUTHENTICATION_REJECT;
2380         }
2381
2382 #ifdef WITH_PROXY
2383         if (request->root->proxy_requests &&
2384             !request->in_proxy_hash &&
2385             (request->reply->code == 0) &&
2386             (request->packet->dst_port != 0) &&
2387             (request->packet->code != PW_STATUS_SERVER)) {
2388                 int rcode = successfully_proxied_request(request);
2389
2390                 if (rcode == 1) return; /* request is invalid */
2391
2392                 /*
2393                  *      Failed proxying it (dead home servers, etc.)
2394                  *      Run it through Post-Proxy-Type = Fail, and
2395                  *      respond to the request.
2396                  *
2397                  *      Note that we're in a child thread here, so we
2398                  *      do NOT re-schedule the request.  Instead, we
2399                  *      do what we would have done, which is run the
2400                  *      pre-handler, a NULL request handler, and then
2401                  *      the post handler.
2402                  */
2403                 if ((rcode < 0) && setup_post_proxy_fail(request)) {
2404                         request_pre_handler(request);
2405                 }
2406
2407                 /*
2408                  *      Else we weren't supposed to proxy it,
2409                  *      OR we proxied it internally to a virutal server.
2410                  */
2411         }
2412
2413 #ifdef WITH_COA
2414         else if (request->proxy && request->coa) {
2415                 RDEBUG("WARNING: Cannot proxy and originate CoA packets at the same time.  Cancelling CoA request");
2416                 ev_request_free(&request->coa);
2417         }
2418 #endif
2419 #endif
2420
2421         /*
2422          *      Fake requests don't get encoded or signed.  The caller
2423          *      also requires the reply VP's, so we don't free them
2424          *      here!
2425          */
2426         if (request->packet->dst_port == 0) {
2427                 /* FIXME: RDEBUG going to the next request */
2428 #ifdef HAVE_PTHREAD_H
2429                 request->child_pid = NO_SUCH_CHILD_PID;
2430 #endif
2431                 request->child_state = REQUEST_DONE;
2432                 return;
2433         }
2434
2435 #ifdef WITH_PROXY
2436         /*
2437          *      Copy Proxy-State from the request to the reply.
2438          */
2439         vp = paircopy2(request->packet->vps, PW_PROXY_STATE);
2440         if (vp) pairadd(&request->reply->vps, vp);
2441 #endif
2442
2443         /*
2444          *      Access-Requests get delayed or cached.
2445          */
2446         switch (request->packet->code) {
2447         case PW_AUTHENTICATION_REQUEST:
2448                 gettimeofday(&request->next_when, NULL);
2449
2450                 if (request->reply->code == 0) {
2451                         /*
2452                          *      Check if the lack of response is intentional.
2453                          */
2454                         vp = pairfind(request->config_items,
2455                                       PW_RESPONSE_PACKET_TYPE);
2456                         if (!vp) {
2457                                 RDEBUG2("There was no response configured: rejecting request %u",
2458                                        request->number);
2459                                 request->reply->code = PW_AUTHENTICATION_REJECT;
2460
2461                         } else if (vp->vp_integer == 256) {
2462                                 RDEBUG2("Not responding to request %u",
2463                                        request->number);
2464
2465                                 /*
2466                                  *      Force cleanup after a long
2467                                  *      time, so that we don't
2468                                  *      re-process the packet.
2469                                  */
2470                                 request->next_when.tv_sec += request->root->max_request_time;
2471                                 request->next_callback = cleanup_delay;
2472                                 child_state = REQUEST_CLEANUP_DELAY;
2473                                 break;
2474                         } else {
2475                                 request->reply->code = vp->vp_integer;
2476
2477                         }
2478                 }
2479
2480                 /*
2481                  *      Run rejected packets through
2482                  *
2483                  *      Post-Auth-Type = Reject
2484                  */
2485                 if (request->reply->code == PW_AUTHENTICATION_REJECT) {
2486                         pairdelete(&request->config_items, PW_POST_AUTH_TYPE);
2487                         vp = radius_pairmake(request, &request->config_items,
2488                                              "Post-Auth-Type", "Reject",
2489                                              T_OP_SET);
2490                         if (vp) rad_postauth(request);
2491
2492                         /*
2493                          *      If configured, delay Access-Reject packets.
2494                          *
2495                          *      If request->root->reject_delay = 0, we discover
2496                          *      that we have to send the packet now.
2497                          */
2498                         when = request->received;
2499                         when.tv_sec += request->root->reject_delay;
2500
2501                         if (timercmp(&when, &request->next_when, >)) {
2502                                 RDEBUG2("Delaying reject of request %u for %d seconds",
2503                                        request->number,
2504                                        request->root->reject_delay);
2505                                 request->next_when = when;
2506                                 request->next_callback = reject_delay;
2507 #ifdef HAVE_PTHREAD_H
2508                                 request->child_pid = NO_SUCH_CHILD_PID;
2509 #endif
2510                                 request->child_state = REQUEST_REJECT_DELAY;
2511                                 return;
2512                         }
2513                 }
2514
2515 #ifdef WITH_COA
2516         case PW_COA_REQUEST:
2517         case PW_DISCONNECT_REQUEST:
2518 #endif
2519                 request->next_when.tv_sec += request->root->cleanup_delay;
2520                 request->next_callback = cleanup_delay;
2521                 child_state = REQUEST_CLEANUP_DELAY;
2522                 break;
2523
2524         case PW_ACCOUNTING_REQUEST:
2525                 request->next_callback = NULL; /* just to be safe */
2526                 child_state = REQUEST_DONE;
2527                 break;
2528
2529                 /*
2530                  *      FIXME: Status-Server should probably not be
2531                  *      handled here...
2532                  */
2533         case PW_STATUS_SERVER:
2534                 request->next_callback = NULL;
2535                 child_state = REQUEST_DONE;
2536                 break;
2537
2538         default:
2539                 /*
2540                  *      DHCP, VMPS, etc.
2541                  */
2542                 request->next_callback = NULL;
2543                 child_state = REQUEST_DONE;
2544                 break;
2545         }
2546
2547         /*
2548          *      Suppress "no reply" packets here, unless we're reading
2549          *      from the "detail" file.  In that case, we've got to
2550          *      tell the detail file handler that the request is dead,
2551          *      and it should re-send it.
2552          *      If configured, encode, sign, and send.
2553          */
2554         if ((request->reply->code != 0) ||
2555             (request->listener->type == RAD_LISTEN_DETAIL)) {
2556                 DEBUG_PACKET(request, request->reply, 1);
2557                 request->listener->send(request->listener, request);
2558         }
2559
2560 #ifdef WITH_COA
2561         /*
2562          *      Now that we've completely processed the request,
2563          *      see if we need to originate a CoA request.  But ONLY
2564          *      if it wasn't proxied.
2565          */
2566         if (!request->proxy &&
2567             (request->coa ||
2568              (pairfind(request->config_items, PW_SEND_COA_REQUEST) != NULL))) {
2569                 if (!originated_coa_request(request)) {
2570                         RDEBUG2("Do CoA Fail handler here");
2571                 }
2572                 /* request->coa is stil set, so we can update events */
2573         }
2574 #endif
2575
2576  cleanup:
2577         /*
2578          *      Clean up.  These are no longer needed.
2579          */
2580         pairfree(&request->config_items);
2581
2582         pairfree(&request->packet->vps);
2583         request->username = NULL;
2584         request->password = NULL;
2585
2586         pairfree(&request->reply->vps);
2587
2588 #ifdef WITH_PROXY
2589         if (request->proxy) {
2590                 pairfree(&request->proxy->vps);
2591
2592                 if (request->proxy_reply) {
2593                         pairfree(&request->proxy_reply->vps);
2594                 }
2595
2596 #if 0
2597                 /*
2598                  *      We're not tracking responses from the home
2599                  *      server, we can therefore free this memory in
2600                  *      the child thread.
2601                  */
2602                 if (!request->in_proxy_hash) {
2603                         rad_free(&request->proxy);
2604                         rad_free(&request->proxy_reply);
2605                         request->home_server = NULL;
2606                 }
2607 #endif
2608         }
2609 #endif
2610
2611         RDEBUG2("Finished request %u.", request->number);
2612         rad_assert(child_state >= 0);
2613         request->child_state = child_state;
2614
2615         /*
2616          *      Single threaded mode: update timers now.
2617          */
2618         if (!have_children) wait_a_bit(request);
2619 }
2620
2621
2622 static void received_retransmit(REQUEST *request, const RADCLIENT *client)
2623 {
2624 #ifdef WITH_PROXY
2625         char buffer[128];
2626 #endif
2627
2628         RAD_STATS_TYPE_INC(request->listener, total_dup_requests);
2629         RAD_STATS_CLIENT_INC(request->listener, client, total_dup_requests);
2630
2631         switch (request->child_state) {
2632         case REQUEST_QUEUED:
2633         case REQUEST_RUNNING:
2634 #ifdef WITH_PROXY
2635         discard:
2636 #endif
2637                 radlog(L_ERR, "Discarding duplicate request from "
2638                        "client %s port %d - ID: %d due to unfinished request %u",
2639                        client->shortname,
2640                        request->packet->src_port,request->packet->id,
2641                        request->number);
2642                 break;
2643
2644 #ifdef WITH_PROXY
2645         case REQUEST_PROXIED:
2646                 /*
2647                  *      We're not supposed to have duplicate
2648                  *      accounting packets.  The other states handle
2649                  *      duplicates fine (discard, or send duplicate
2650                  *      reply).  But we do NOT want to retransmit an
2651                  *      accounting request here, because that would
2652                  *      involve updating the Acct-Delay-Time, and
2653                  *      therefore changing the packet Id, etc.
2654                  *
2655                  *      Instead, we just discard the packet.  We may
2656                  *      eventually respond, or the client will send a
2657                  *      new accounting packet.
2658                  *
2659                  *      The same comments go for Status-Server, and
2660                  *      other packet types.
2661                  *
2662                  *      FIXME: coa: when we proxy CoA && Disconnect
2663                  *      packets, this logic has to be fixed.
2664                  */
2665                 if (request->packet->code != PW_AUTHENTICATION_REQUEST) {
2666                         goto discard;
2667                 }
2668
2669                 check_for_zombie_home_server(request);
2670
2671                 /*
2672                  *      If we've just discovered that the home server
2673                  *      is dead, OR the socket has been closed, look for
2674                  *      another connection to a home server.
2675                  */
2676                 if (((request->packet->dst_port != 0) &&
2677                      (request->home_server->state == HOME_STATE_IS_DEAD)) ||
2678                     (request->proxy_listener->status != RAD_LISTEN_STATUS_KNOWN)) {
2679                         home_server *home;
2680
2681                         remove_from_proxy_hash(request);
2682
2683                         home = home_server_ldb(NULL, request->home_pool, request);
2684                         if (!home) {
2685                                 RDEBUG2("Failed to find live home server for request %u", request->number);
2686                         no_home_servers:
2687                                 /*
2688                                  *      Do post-request processing,
2689                                  *      and any insertion of necessary
2690                                  *      events.
2691                                  */
2692                                 post_proxy_fail_handler(request);
2693                                 return;
2694                         }
2695
2696                         request->proxy->code = request->packet->code;
2697
2698                         /*
2699                          *      Free the old packet, to force re-encoding
2700                          */
2701                         free(request->proxy->data);
2702                         request->proxy->data = NULL;
2703                         request->proxy->data_len = 0;
2704
2705                         /*
2706                          *      This request failed over to a virtual
2707                          *      server.  Push it back onto the queue
2708                          *      to be processed.
2709                          */
2710                         if (request->home_server->server) {
2711                                 proxy_fallback_handler(request);
2712                                 return;
2713                         }
2714
2715                         /*
2716                          *      Try to proxy the request.
2717                          */
2718                         if (!proxy_request(request)) {
2719                                 RDEBUG("ERROR: Failed to re-proxy request %u", request->number);
2720                                 goto no_home_servers;
2721                         }
2722
2723                         /*
2724                          *      This code executes in the main server
2725                          *      thread, so there's no need for locking.
2726                          */
2727                         rad_assert(request->next_callback != NULL);
2728                         INSERT_EVENT(request->next_callback, request);
2729                         request->next_callback = NULL;
2730                         return;
2731                 } /* else the home server is still alive */
2732
2733 #ifdef WITH_TCP
2734                 if (request->home_server->proto == IPPROTO_TCP) {
2735                         DEBUG2("Suppressing duplicate proxied request to home server %s port %d proto TCP - ID: %d",
2736                                inet_ntop(request->proxy->dst_ipaddr.af,
2737                                          &request->proxy->dst_ipaddr.ipaddr,
2738                                          buffer, sizeof(buffer)),
2739                                request->proxy->dst_port,
2740                                request->proxy->id);
2741                         break;
2742                 }
2743 #endif
2744
2745                 RDEBUG2("Sending duplicate proxied request to home server %s port %d - ID: %d",
2746                        inet_ntop(request->proxy->dst_ipaddr.af,
2747                                  &request->proxy->dst_ipaddr.ipaddr,
2748                                  buffer, sizeof(buffer)),
2749                        request->proxy->dst_port,
2750                        request->proxy->id);
2751                 request->num_proxied_requests++;
2752
2753                 DEBUG_PACKET(request, request->proxy, 1);
2754                 request->proxy_listener->send(request->proxy_listener,
2755                                               request);
2756                 break;
2757 #endif
2758
2759         case REQUEST_REJECT_DELAY:
2760                 RDEBUG2("Waiting to send Access-Reject "
2761                        "to client %s port %d - ID: %d",
2762                        client->shortname,
2763                        request->packet->src_port, request->packet->id);
2764                 break;
2765
2766         case REQUEST_CLEANUP_DELAY:
2767         case REQUEST_DONE:
2768                 if (request->reply->code == 0) {
2769                         RDEBUG2("Ignoring retransmit from client %s port %d "
2770                                 "- ID: %d, no reply was configured",
2771                                 client->shortname,
2772                                 request->packet->src_port, request->packet->id);
2773                         return;
2774                 }
2775
2776                 /*
2777                  *      FIXME: This sends duplicate replies to
2778                  *      accounting requests, even if Acct-Delay-Time
2779                  *      or Event-Timestamp is in the packet.  In those
2780                  *      cases, the Id should be changed, and the packet
2781                  *      re-calculated.
2782                  */
2783                 RDEBUG2("Sending duplicate reply "
2784                        "to client %s port %d - ID: %d",
2785                        client->shortname,
2786                        request->packet->src_port, request->packet->id);
2787                 DEBUG_PACKET(request, request->reply, 1);
2788                 request->listener->send(request->listener, request);
2789                 break;
2790         }
2791 }
2792
2793
2794 static void received_conflicting_request(REQUEST *request,
2795                                          const RADCLIENT *client)
2796 {
2797         radlog(L_ERR, "Received conflicting packet from "
2798                "client %s port %d - ID: %d due to unfinished request %u.  Giving up on old request.",
2799                client->shortname,
2800                request->packet->src_port, request->packet->id,
2801                request->number);
2802
2803         /*
2804          *      Nuke it from the request hash, so we can receive new
2805          *      packets.
2806          */
2807         remove_from_request_hash(request);
2808
2809         switch (request->child_state) {
2810                 /*
2811                  *      Tell it to stop, and wait for it to do so.
2812                  */
2813         default:
2814                 request->master_state = REQUEST_STOP_PROCESSING;
2815                 request->delay += request->delay >> 1;
2816
2817                 tv_add(&request->when, request->delay);
2818
2819                 INSERT_EVENT(wait_for_child_to_die, request);
2820                 return;
2821
2822                 /*
2823                  *      Catch race conditions.  It may have switched
2824                  *      from running to done while this code is being
2825                  *      executed.
2826                  */
2827         case REQUEST_REJECT_DELAY:
2828         case REQUEST_CLEANUP_DELAY:
2829         case REQUEST_DONE:
2830                 break;
2831         }
2832 }
2833
2834
2835 static int can_handle_new_request(RADIUS_PACKET *packet,
2836                                   RADCLIENT *client,
2837                                   struct main_config_t *root)
2838 {
2839         /*
2840          *      Count the total number of requests, to see if
2841          *      there are too many.  If so, return with an
2842          *      error.
2843          */
2844         if (root->max_requests) {
2845                 int request_count = fr_packet_list_num_elements(pl);
2846
2847                 /*
2848                  *      This is a new request.  Let's see if
2849                  *      it makes us go over our configured
2850                  *      bounds.
2851                  */
2852                 if (request_count > root->max_requests) {
2853                         radlog(L_ERR, "Dropping request (%d is too many): "
2854                                "from client %s port %d - ID: %d", request_count,
2855                                client->shortname,
2856                                packet->src_port, packet->id);
2857                         radlog(L_INFO, "WARNING: Please check the configuration file.\n"
2858                                "\tThe value for 'max_requests' is probably set too low.\n");
2859                         return 0;
2860                 } /* else there were a small number of requests */
2861         } /* else there was no configured limit for requests */
2862
2863         /*
2864          *      FIXME: Add per-client checks.  If one client is sending
2865          *      too many packets, start discarding them.
2866          *
2867          *      We increment the counters here, and decrement them
2868          *      when the response is sent... somewhere in this file.
2869          */
2870
2871         /*
2872          *      FUTURE: Add checks for system load.  If the system is
2873          *      busy, start dropping requests...
2874          *
2875          *      We can probably keep some statistics ourselves...  if
2876          *      there are more requests coming in than we can handle,
2877          *      start dropping some.
2878          */
2879
2880         return 1;
2881 }
2882
2883
2884 int received_request(rad_listen_t *listener,
2885                      RADIUS_PACKET *packet, REQUEST **prequest,
2886                      RADCLIENT *client)
2887 {
2888         RADIUS_PACKET **packet_p;
2889         REQUEST *request = NULL;
2890         struct main_config_t *root = &mainconfig;
2891
2892         packet_p = fr_packet_list_find(pl, packet);
2893         if (packet_p) {
2894                 request = fr_packet2myptr(REQUEST, packet, packet_p);
2895                 rad_assert(request->in_request_hash);
2896
2897                 if ((request->packet->data_len == packet->data_len) &&
2898                     (memcmp(request->packet->vector, packet->vector,
2899                             sizeof(packet->vector)) == 0)) {
2900                         received_retransmit(request, client);
2901                         return 0;
2902                 }
2903
2904                 /*
2905                  *      The new request is different from the old one,
2906                  *      but maybe the old is finished.  If so, delete
2907                  *      the old one.
2908                  */
2909                 switch (request->child_state) {
2910                         struct timeval when;
2911
2912                 default:
2913                         /*
2914                          *      Special hacks for race conditions.
2915                          *      The reply is encoded, and therefore
2916                          *      likely sent.  We received a *new*
2917                          *      packet from the client, likely before
2918                          *      the next line or two of code which
2919                          *      updated the child state.  In this
2920                          *      case, just accept the new request.
2921                          */
2922                         if ((request->reply->code != 0) &&
2923                             request->reply->data) {
2924                                 radlog(L_INFO, "WARNING: Allowing fast client %s port %d - ID: %d for recent request %u.",
2925                                        client->shortname,
2926                                        packet->src_port, packet->id,
2927                                        request->number);
2928                                 remove_from_request_hash(request);
2929                                 request = NULL;
2930                                 break;
2931                         }
2932
2933                         gettimeofday(&when, NULL);
2934                         when.tv_sec -= 1;
2935
2936                         /*
2937                          *      If the cached request was received
2938                          *      within the last second, then we
2939                          *      discard the NEW request instead of the
2940                          *      old one.  This will happen ONLY when
2941                          *      the client is severely broken, and is
2942                          *      sending conflicting packets very
2943                          *      quickly.
2944                          */
2945                         if (timercmp(&when, &request->received, <)) {
2946                                 radlog(L_ERR, "Discarding conflicting packet from "
2947                                        "client %s port %d - ID: %d due to recent request %u.",
2948                                        client->shortname,
2949                                        packet->src_port, packet->id,
2950                                        request->number);
2951                                 return 0;
2952                         }
2953
2954                         received_conflicting_request(request, client);
2955                         request = NULL;
2956                         break;
2957
2958                 case REQUEST_REJECT_DELAY:
2959                 case REQUEST_CLEANUP_DELAY:
2960                         request->child_state = REQUEST_DONE;
2961                 case REQUEST_DONE:
2962                         cleanup_delay(request);
2963                         request = NULL;
2964                         break;
2965                 }
2966         }
2967
2968         /*
2969          *      We may want to quench the new request.
2970          */
2971         if ((listener->type != RAD_LISTEN_DETAIL) &&
2972             !can_handle_new_request(packet, client, root)) {
2973                 return 0;
2974         }
2975
2976         /*
2977          *      Create and initialize the new request.
2978          */
2979         request = request_alloc(); /* never fails */
2980
2981         if ((request->reply = rad_alloc(0)) == NULL) {
2982                 radlog(L_ERR, "No memory");
2983                 return 0;
2984         }
2985
2986         request->listener = listener;
2987         request->client = client;
2988         request->packet = packet;
2989         request->packet->timestamp = request->timestamp;
2990         request->number = request_num_counter++;
2991         request->priority = listener->type;
2992 #ifdef HAVE_PTHREAD_H
2993         request->child_pid = NO_SUCH_CHILD_PID;
2994 #endif
2995
2996         /*
2997          *      Status-Server packets go to the head of the queue.
2998          */
2999         if (request->packet->code == PW_STATUS_SERVER) request->priority = 0;
3000
3001         /*
3002          *      Set virtual server identity
3003          */
3004         if (client->server) {
3005                 request->server = client->server;
3006         } else if (listener->server) {
3007                 request->server = listener->server;
3008         } else {
3009                 request->server = NULL;
3010         }
3011
3012         /*
3013          *      Remember the request in the list.
3014          */
3015         if (!fr_packet_list_insert(pl, &request->packet)) {
3016                 radlog(L_ERR, "Failed to insert request %u in the list of live requests: discarding", request->number);
3017                 ev_request_free(&request);
3018                 return 0;
3019         }
3020
3021         request->in_request_hash = TRUE;
3022         request->root = root;
3023         root->refcount++;
3024 #ifdef WITH_TCP
3025         request->listener->count++;
3026 #endif
3027
3028         /*
3029          *      The request passes many of our sanity checks.
3030          *      From here on in, if anything goes wrong, we
3031          *      send a reject message, instead of dropping the
3032          *      packet.
3033          */
3034
3035         /*
3036          *      Build the reply template from the request.
3037          */
3038
3039         request->reply->sockfd = request->packet->sockfd;
3040         request->reply->dst_ipaddr = request->packet->src_ipaddr;
3041         request->reply->src_ipaddr = request->packet->dst_ipaddr;
3042         request->reply->dst_port = request->packet->src_port;
3043         request->reply->src_port = request->packet->dst_port;
3044         request->reply->id = request->packet->id;
3045         request->reply->code = 0; /* UNKNOWN code */
3046         memcpy(request->reply->vector, request->packet->vector,
3047                sizeof(request->reply->vector));
3048         request->reply->vps = NULL;
3049         request->reply->data = NULL;
3050         request->reply->data_len = 0;
3051
3052         request->master_state = REQUEST_ACTIVE;
3053         request->child_state = REQUEST_QUEUED;
3054         request->next_callback = NULL;
3055
3056         gettimeofday(&request->received, NULL);
3057         request->timestamp = request->received.tv_sec;
3058         request->when = request->received;
3059
3060         request->delay = USEC;
3061
3062         tv_add(&request->when, request->delay);
3063
3064         INSERT_EVENT(wait_a_bit, request);
3065
3066         *prequest = request;
3067         return 1;
3068 }
3069
3070
3071 #ifdef WITH_PROXY
3072 REQUEST *received_proxy_response(RADIUS_PACKET *packet)
3073 {
3074         char            buffer[128];
3075         REQUEST         *request;
3076
3077         /*
3078          *      Also removes from the proxy hash if responses == requests
3079          */
3080         request = lookup_in_proxy_hash(packet);
3081
3082         if (!request) {
3083                 radlog(L_PROXY, "No outstanding request was found for reply from host %s port %d - ID %d",
3084                        inet_ntop(packet->src_ipaddr.af,
3085                                  &packet->src_ipaddr.ipaddr,
3086                                  buffer, sizeof(buffer)),
3087                        packet->src_port, packet->id);
3088                 return NULL;
3089         }
3090
3091         /*
3092          *      We haven't replied to the NAS, but we have seen an
3093          *      earlier reply from the home server.  Ignore this packet,
3094          *      as we're likely still processing the previous reply.
3095          */
3096         if (request->proxy_reply) {
3097                 if (memcmp(request->proxy_reply->vector,
3098                            packet->vector,
3099                            sizeof(request->proxy_reply->vector)) == 0) {
3100                         RDEBUG2("Discarding duplicate reply from host %s port %d  - ID: %d for request %u",
3101                                inet_ntop(packet->src_ipaddr.af,
3102                                          &packet->src_ipaddr.ipaddr,
3103                                          buffer, sizeof(buffer)),
3104                                packet->src_port, packet->id,
3105                                request->number);
3106                 } else {
3107                         /*
3108                          *      ? The home server gave us a new proxy
3109                          *      reply which doesn't match the old
3110                          *      one.  Delete it.
3111                          */
3112                         RDEBUG2("Ignoring conflicting proxy reply");
3113                 }
3114
3115                 /* assert that there's an event queued for request? */
3116                 return NULL;
3117         }
3118
3119         /*
3120          *      Verify the packet before doing ANYTHING with it.  This
3121          *      means we're doing more MD5 checks in the server core.
3122          *      However, we can fix that by moving to multiple threads
3123          *      listening on sockets.
3124          *
3125          *      We do this AFTER looking the request up in the hash,
3126          *      and AFTER vhecking if we saw a previous request.  This
3127          *      helps minimize the DoS effect of people attacking us
3128          *      with spoofed packets.
3129          */
3130         if (rad_verify(packet, request->proxy,
3131                        request->home_server->secret) != 0) {
3132                 DEBUG("Ignoring spoofed proxy reply.  Signature is invalid");
3133                 return NULL;
3134         }
3135
3136         gettimeofday(&now, NULL);
3137
3138         /*
3139          *      Maybe move this earlier in the decision process?
3140          *      Having it here means that late or duplicate proxy
3141          *      replies no longer get the home server marked as
3142          *      "alive".  This might be good for stability, though.
3143          *
3144          *      FIXME: Do we really want to do this whenever we
3145          *      receive a packet?  Setting this here means that we
3146          *      mark it alive on *any* packet, even if it's lost all
3147          *      of the *other* packets in the last 10s.
3148          */
3149         if (request->proxy->code != PW_STATUS_SERVER) {
3150                 request->home_server->state = HOME_STATE_ALIVE;
3151         }
3152
3153 #ifdef WITH_COA
3154         /*
3155          *      When originating CoA, the "proxy" reply is the reply
3156          *      to the CoA request that we originated.  At this point,
3157          *      the original request is finished, and it has a reply.
3158          *
3159          *      However, if we haven't separated the two requests, do
3160          *      so now.  This is done so that cleaning up the original
3161          *      request won't cause the CoA request to be free'd.  See
3162          *      util.c, request_free()
3163          */
3164         if (request->parent && (request->parent->coa == request)) {
3165                 request->parent->coa = NULL;
3166                 request->parent = NULL;
3167
3168                 /*
3169                  *      The proxied packet was different from the
3170                  *      original packet, AND the proxied packet was
3171                  *      a CoA: allow it.
3172                  */
3173         } else if ((request->packet->code != request->proxy->code) &&
3174                    ((request->proxy->code == PW_COA_REQUEST) ||
3175                     (request->proxy->code == PW_DISCONNECT_REQUEST))) {
3176           /*
3177            *    It's already divorced: do nothing.
3178            */
3179
3180         } else
3181                 /*
3182                  *      Skip the next set of checks, as the original
3183                  *      reply is cached.  We want to be able to still
3184                  *      process the CoA reply, AND to reference the
3185                  *      original request/reply.
3186                  *
3187                  *      This is getting to be really quite a bit of a
3188                  *      hack.
3189                  */
3190 #endif
3191
3192         /*
3193          *      If there's a reply to the NAS, ignore everything
3194          *      related to proxy responses
3195          */
3196         if (request->reply && request->reply->code != 0) {
3197                 RDEBUG2("Ignoring proxy reply that arrived after we sent a reply to the NAS");
3198                 return NULL;
3199         }
3200
3201 #ifdef WITH_STATS
3202         /*
3203          *      The average includes our time to receive packets and
3204          *      look them up in the hashes, which should be the same
3205          *      for all packets.
3206          *
3207          *      We update the response time only for the FIRST packet
3208          *      we receive.
3209          */
3210         if (request->home_server->ema.window > 0) {
3211                 radius_stats_ema(&request->home_server->ema,
3212                                  &now, &request->proxy_when);
3213         }
3214 #endif
3215
3216         switch (request->child_state) {
3217         case REQUEST_QUEUED:
3218         case REQUEST_RUNNING:
3219                 radlog(L_ERR, "Internal sanity check failed for child state");
3220                 /* FALL-THROUGH */
3221
3222         case REQUEST_REJECT_DELAY:
3223         case REQUEST_CLEANUP_DELAY:
3224         case REQUEST_DONE:
3225                 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'",
3226                        inet_ntop(packet->src_ipaddr.af,
3227                                  &packet->src_ipaddr.ipaddr,
3228                                  buffer, sizeof(buffer)),
3229                        packet->src_port, packet->id,
3230                        request->number);
3231                 /* assert that there's an event queued for request? */
3232                 return NULL;
3233
3234         case REQUEST_PROXIED:
3235                 break;
3236         }
3237
3238         request->proxy_reply = packet;
3239
3240 #if 0
3241         /*
3242          *      Perform RTT calculations, as per RFC 2988 (for TCP).
3243          *      Note that we only do so on the first response.
3244          */
3245         if ((request->num_proxied_responses == 1)
3246                 int rtt;
3247                 home_server *home = request->home_server;
3248
3249                 rtt = now.tv_sec - request->proxy_when.tv_sec;
3250                 rtt *= USEC;
3251                 rtt += now.tv_usec;
3252                 rtt -= request->proxy_when.tv_usec;
3253
3254                 if (!home->has_rtt) {
3255                         home->has_rtt = TRUE;
3256
3257                         home->srtt = rtt;
3258                         home->rttvar = rtt / 2;
3259
3260                 } else {
3261                         home->rttvar -= home->rttvar >> 2;
3262                         home->rttvar += (home->srtt - rtt);
3263                         home->srtt -= home->srtt >> 3;
3264                         home->srtt += rtt >> 3;
3265                 }
3266
3267                 home->rto = home->srtt;
3268                 if (home->rttvar > (USEC / 4)) {
3269                         home->rto += home->rttvar * 4;
3270                 } else {
3271                         home->rto += USEC;
3272                 }
3273         }
3274 #endif
3275
3276         /*
3277          *      There's no incoming request, so it's a proxied packet
3278          *      we originated.
3279          */
3280         if (!request->packet) {
3281                 received_response_to_ping(request);
3282                 request->proxy_reply = NULL; /* caller will free it */
3283                 ev_request_free(&request);
3284                 return NULL;
3285         }
3286
3287         request->child_state = REQUEST_QUEUED;
3288         request->when = now;
3289         request->delay = USEC;
3290         request->priority = RAD_LISTEN_PROXY;
3291         tv_add(&request->when, request->delay);
3292
3293         /*
3294          *      Wait a bit will take care of max_request_time
3295          */
3296         INSERT_EVENT(wait_a_bit, request);
3297
3298         return request;
3299 }
3300
3301 #endif /* WITH_PROXY */
3302
3303 #ifdef WITH_TCP
3304 static void tcp_socket_lifetime(void *ctx)
3305 {
3306         rad_listen_t *listener = ctx;
3307         char buffer[256];
3308
3309         listener->print(listener, buffer, sizeof(buffer));
3310
3311         DEBUG("Reached maximum lifetime on socket %s", buffer);
3312
3313         listener->status = RAD_LISTEN_STATUS_CLOSED;
3314         event_new_fd(listener);
3315 }
3316
3317 static void tcp_socket_idle_timeout(void *ctx)
3318 {
3319         rad_listen_t *listener = ctx;
3320         listen_socket_t *sock = listener->data;
3321         char buffer[256];
3322
3323         fr_event_now(el, &now); /* should always succeed... */
3324
3325         rad_assert(sock->home != NULL);
3326
3327         /*
3328          *      We implement idle timeout by polling, because it's
3329          *      cheaper than resetting the idle timeout every time
3330          *      we send / receive a packet.
3331          */
3332         if ((sock->last_packet + sock->home->idle_timeout) > now.tv_sec) {
3333                 struct timeval when;
3334                 void *fun = tcp_socket_idle_timeout;
3335
3336                 when.tv_sec = sock->last_packet;
3337                 when.tv_sec += sock->home->idle_timeout;
3338                 when.tv_usec = 0;
3339
3340                 if (sock->home->lifetime &&
3341                     (sock->opened + sock->home->lifetime < when.tv_sec)) {
3342                         when.tv_sec = sock->opened + sock->home->lifetime;
3343                         fun = tcp_socket_lifetime;
3344                 }
3345
3346                 if (!fr_event_insert(el, fun, listener, &when, &sock->ev)) {
3347                         rad_panic("Failed to insert event");
3348                 }
3349
3350                 return;
3351         }
3352
3353         listener->print(listener, buffer, sizeof(buffer));
3354
3355         DEBUG("Reached idle timeout on socket %s", buffer);
3356
3357         listener->status = RAD_LISTEN_STATUS_CLOSED;
3358         event_new_fd(listener);
3359 }
3360 #endif
3361
3362 int event_new_fd(rad_listen_t *this)
3363 {
3364         char buffer[1024];
3365
3366         if (this->status == RAD_LISTEN_STATUS_KNOWN) return 1;
3367
3368         this->print(this, buffer, sizeof(buffer));
3369
3370         if (this->status == RAD_LISTEN_STATUS_INIT) {
3371                 if (just_started) {
3372                         DEBUG("Listening on %s", buffer);
3373                 } else {
3374                         radlog(L_INFO, " ... adding new socket %s", buffer);
3375                 }
3376
3377 #ifdef WITH_PROXY
3378                 /*
3379                  *      Add it to the list of sockets we can use.
3380                  *      Server sockets (i.e. auth/acct) are never
3381                  *      added to the packet list.
3382                  */
3383                 if (this->type == RAD_LISTEN_PROXY) {
3384                         listen_socket_t *sock = this->data;
3385
3386                         PTHREAD_MUTEX_LOCK(&proxy_mutex);
3387                         if (!fr_packet_list_socket_add(proxy_list, this->fd,
3388                                                        sock->proto,
3389                                                        &sock->other_ipaddr, sock->other_port,
3390                                                        this)) {
3391
3392                                 proxy_no_new_sockets = TRUE;
3393                                 PTHREAD_MUTEX_UNLOCK(&proxy_mutex);
3394
3395                                 /*
3396                                  *      This is bad.  However, the
3397                                  *      packet list now supports 256
3398                                  *      open sockets, which should
3399                                  *      minimize this problem.
3400                                  */
3401                                 radlog(L_ERR, "Failed adding proxy socket: %s",
3402                                        fr_strerror());
3403                                 return 0;
3404                         }
3405
3406                         if (sock->home) {
3407                                 sock->home->num_connections++;
3408
3409                                 /*
3410                                  *      If necessary, add it to the list of
3411                                  *      new proxy listeners.
3412                                  */
3413                                 if (sock->home->lifetime || sock->home->idle_timeout) {
3414                                         this->next = proxy_listener_list;
3415                                         proxy_listener_list = this;
3416                                 }
3417                         }
3418                         PTHREAD_MUTEX_UNLOCK(&proxy_mutex);
3419
3420                         /*
3421                          *      Tell the main thread that we've added
3422                          *      a proxy listener, but only if we need
3423                          *      to update the event list.  Do this
3424                          *      with the mutex unlocked, to reduce
3425                          *      contention.
3426                          */
3427                         if (sock->home) {
3428                                 if (sock->home->lifetime || sock->home->idle_timeout) {
3429                                         radius_signal_self(RADIUS_SIGNAL_SELF_NEW_FD);
3430                                 }
3431                         }
3432                 }
3433 #endif
3434
3435 #ifdef WITH_DETAIL
3436                 /*
3437                  *      Detail files are always known, and aren't
3438                  *      put into the socket event loop.
3439                  */
3440                 if (this->type == RAD_LISTEN_DETAIL) {
3441                         this->status = RAD_LISTEN_STATUS_KNOWN;
3442
3443                         /*
3444                          *      Set up the first poll interval.
3445                          */
3446                         event_poll_detail(this);
3447                         return 1;
3448                 }
3449 #endif
3450
3451                 FD_MUTEX_LOCK(&fd_mutex);
3452                 if (!fr_event_fd_insert(el, 0, this->fd,
3453                                         event_socket_handler, this)) {
3454                         radlog(L_ERR, "Failed adding event handler for proxy socket!");
3455                         exit(1);
3456                 }
3457                 FD_MUTEX_UNLOCK(&fd_mutex);
3458
3459                 this->status = RAD_LISTEN_STATUS_KNOWN;
3460                 return 1;
3461         }
3462
3463         /*
3464          *      Something went wrong with the socket: make it harmless.
3465          */
3466         if (this->status == RAD_LISTEN_STATUS_REMOVE_FD) {
3467                 int devnull;
3468
3469                 /*
3470                  *      Remove it from the list of live FD's.
3471                  */
3472                 FD_MUTEX_LOCK(&fd_mutex);
3473                 fr_event_fd_delete(el, 0, this->fd);
3474                 FD_MUTEX_UNLOCK(&fd_mutex);
3475
3476 #ifdef WITH_TCP
3477                 /*
3478                  *      We track requests using this socket only for
3479                  *      TCP.  For UDP, we don't currently close
3480                  *      sockets.
3481                  */
3482 #ifdef WITH_PROXY
3483                 if (this->type != RAD_LISTEN_PROXY)
3484 #endif
3485                 {
3486                         if (this->count != 0) {
3487                                 fr_packet_list_walk(pl, this,
3488                                                     remove_all_requests);
3489                         }
3490
3491                         if (this->count == 0) {
3492                                 this->status = RAD_LISTEN_STATUS_FINISH;
3493                                 goto finish;
3494                         }
3495                 }
3496 #ifdef WITH_PROXY
3497                 else {
3498                         int count = this->count;
3499
3500                         /*
3501                          *      Duplicate code
3502                          */
3503                         PTHREAD_MUTEX_LOCK(&proxy_mutex);
3504                         if (!fr_packet_list_socket_freeze(proxy_list,
3505                                                           this->fd)) {
3506                                 radlog(L_ERR, "Fatal error freezing socket: %s",
3507                                        fr_strerror());
3508                                 exit(1);
3509                         }
3510
3511                         /*
3512                          *      Doing this with the proxy mutex held
3513                          *      is a Bad Thing.  We should move to
3514                          *      finer-grained mutexes.
3515                          */
3516                         count = this->count;
3517                         if (count > 0) {
3518                                 fr_packet_list_walk(proxy_list, this,
3519                                                     remove_all_proxied_requests);
3520                         }
3521                         count = this->count; /* protected by mutex */
3522                         PTHREAD_MUTEX_UNLOCK(&proxy_mutex);
3523
3524                         if (count == 0) {
3525                                 this->status = RAD_LISTEN_STATUS_FINISH;
3526                                 goto finish;
3527                         }
3528                 }
3529 #endif  /* WITH_PROXY */
3530 #endif  /* WITH_TCP */
3531
3532                 /*
3533                  *      Re-open the socket, pointing it to /dev/null.
3534                  *      This means that all writes proceed without
3535                  *      blocking, and all reads return "no data".
3536                  *
3537                  *      This leaves the socket active, so any child
3538                  *      threads won't go insane.  But it means that
3539                  *      they cannot send or receive any packets.
3540                  *
3541                  *      This is EXTRA work in the normal case, when
3542                  *      sockets are closed without error.  But it lets
3543                  *      us have one simple processing method for all
3544                  *      sockets.
3545                  */
3546                 devnull = open("/dev/null", O_RDWR);
3547                 if (devnull < 0) {
3548                         radlog(L_ERR, "FATAL failure opening /dev/null: %s",
3549                                strerror(errno));
3550                         exit(1);
3551                 }
3552                 if (dup2(devnull, this->fd) < 0) {
3553                         radlog(L_ERR, "FATAL failure closing socket: %s",
3554                                strerror(errno));
3555                         exit(1);
3556                 }
3557                 close(devnull);
3558
3559                 this->status = RAD_LISTEN_STATUS_CLOSED;
3560
3561                 /*
3562                  *      Fall through to the next section.
3563                  */
3564         }
3565
3566 #ifdef WITH_TCP
3567         /*
3568          *      Called ONLY from the main thread.  On the following
3569          *      conditions:
3570          *
3571          *      idle timeout
3572          *      max lifetime
3573          *
3574          *      (and falling through from "forcibly close FD" above)
3575          *      client closed connection on us
3576          *      client sent us a bad packet.
3577          */
3578         if (this->status == RAD_LISTEN_STATUS_CLOSED) {
3579                 int count = this->count;
3580                 rad_assert(this->type != RAD_LISTEN_DETAIL);
3581
3582 #ifdef WITH_PROXY
3583                 /*
3584                  *      Remove it from the list of active sockets, so
3585                  *      that it isn't used when proxying new packets.
3586                  */
3587                 if (this->type == RAD_LISTEN_PROXY) {
3588                         PTHREAD_MUTEX_LOCK(&proxy_mutex);
3589                         if (!fr_packet_list_socket_freeze(proxy_list,
3590                                                           this->fd)) {
3591                                 radlog(L_ERR, "Fatal error freezing socket: %s",
3592                                        fr_strerror());
3593                                 exit(1);
3594                         }
3595                         count = this->count; /* protected by mutex */
3596                         PTHREAD_MUTEX_UNLOCK(&proxy_mutex);
3597                 }
3598 #endif
3599
3600                 /*
3601                  *      Requests are still using the socket.  Wait for
3602                  *      them to finish.
3603                  */
3604                 if (count != 0) {
3605                         struct timeval when;
3606                         listen_socket_t *sock = this->data;
3607
3608                         /*
3609                          *      Try again to clean up the socket in 30
3610                          *      seconds.
3611                          */
3612                         gettimeofday(&when, NULL);
3613                         when.tv_sec += 30;
3614
3615                         if (!fr_event_insert(el,
3616                                              (fr_event_callback_t) event_new_fd,
3617                                              this, &when, &sock->ev)) {
3618                                 rad_panic("Failed to insert event");
3619                         }
3620
3621                         return 1;
3622                 }
3623
3624                 /*
3625                  *      No one is using this socket: we can delete it
3626                  *      immediately.
3627                  */
3628                 this->status = RAD_LISTEN_STATUS_FINISH;
3629         }
3630
3631 finish:
3632         if (this->status == RAD_LISTEN_STATUS_FINISH) {
3633                 listen_socket_t *sock = this->data;
3634
3635                 rad_assert(this->count == 0);
3636                 radlog(L_INFO, " ... closing socket %s", buffer);
3637
3638                 /*
3639                  *      Remove it from the list of live FD's.  Note
3640                  *      that it MAY also have been removed above.  We
3641                  *      do it again here, to catch the case of sockets
3642                  *      closing on idle timeout, or max
3643                  *      lifetime... AFTER all requests have finished
3644                  *      using it.
3645                  */
3646                 FD_MUTEX_LOCK(&fd_mutex);
3647                 fr_event_fd_delete(el, 0, this->fd);
3648                 FD_MUTEX_UNLOCK(&fd_mutex);
3649
3650 #ifdef WITH_PROXY
3651                 /*
3652                  *      Remove it from the list of sockets to be used
3653                  *      when proxying.
3654                  */
3655                 if (this->type == RAD_LISTEN_PROXY) {
3656                         PTHREAD_MUTEX_LOCK(&proxy_mutex);
3657                         if (!fr_packet_list_socket_remove(proxy_list,
3658                                                           this->fd, NULL)) {
3659                                 radlog(L_ERR, "Fatal error removing socket: %s",
3660                                        fr_strerror());
3661                                 exit(1);
3662                         }
3663                         if (sock->home) sock->home->num_connections--;
3664                         PTHREAD_MUTEX_UNLOCK(&proxy_mutex);
3665                 }
3666 #endif
3667
3668                 /*
3669                  *      Remove any pending cleanups.
3670                  */
3671                 if (sock->ev) fr_event_delete(el, &sock->ev);
3672
3673                 /*
3674                  *      And finally, close the socket.
3675                  */
3676                 listen_free(&this);
3677         }
3678 #endif  /* WITH_TCP */
3679
3680         return 1;
3681 }
3682
3683 static void handle_signal_self(int flag)
3684 {
3685         if ((flag & (RADIUS_SIGNAL_SELF_EXIT | RADIUS_SIGNAL_SELF_TERM)) != 0) {
3686                 if ((flag & RADIUS_SIGNAL_SELF_EXIT) != 0) {
3687                         radlog(L_INFO, "Received TERM signal");
3688                         fr_event_loop_exit(el, 1);
3689                 } else {
3690                         fr_event_loop_exit(el, 2);
3691                 }
3692
3693                 return;
3694         } /* else exit/term flags weren't set */
3695
3696         /*
3697          *      Tell the even loop to stop processing.
3698          */
3699         if ((flag & RADIUS_SIGNAL_SELF_HUP) != 0) {
3700                 time_t when;
3701                 static time_t last_hup = 0;
3702
3703                 when = time(NULL);
3704                 if ((int) (when - last_hup) < 5) {
3705                         radlog(L_INFO, "Ignoring HUP (less than 5s since last one)");
3706                         return;
3707                 }
3708
3709                 radlog(L_INFO, "Received HUP signal.");
3710
3711                 last_hup = when;
3712
3713                 fr_event_loop_exit(el, 0x80);
3714         }
3715
3716 #ifdef WITH_DETAIL
3717         if ((flag & RADIUS_SIGNAL_SELF_DETAIL) != 0) {
3718                 rad_listen_t *this;
3719
3720                 /*
3721                  *      FIXME: O(N) loops suck.
3722                  */
3723                 for (this = mainconfig.listen;
3724                      this != NULL;
3725                      this = this->next) {
3726                         if (this->type != RAD_LISTEN_DETAIL) continue;
3727
3728                         /*
3729                          *      This one didn't send the signal, skip
3730                          *      it.
3731                          */
3732                         if (!this->decode(this, NULL)) continue;
3733
3734                         /*
3735                          *      Go service the interrupt.
3736                          */
3737                         event_poll_detail(this);
3738                 }
3739         }
3740 #endif
3741
3742 #ifdef WITH_TCP
3743 #ifdef WITH_PROXY
3744         /*
3745          *      Add event handlers for idle timeouts && maximum lifetime.
3746          */
3747         if ((flag & RADIUS_SIGNAL_SELF_NEW_FD) != 0) {
3748                 struct timeval when;
3749                 void *fun = NULL;
3750
3751                 fr_event_now(el, &now);
3752
3753                 PTHREAD_MUTEX_LOCK(&proxy_mutex);
3754
3755                 while (proxy_listener_list) {
3756                         rad_listen_t *this = proxy_listener_list;
3757                         listen_socket_t *sock = this->data;
3758
3759                         proxy_listener_list = this->next;
3760                         this->next = NULL;
3761
3762                         if (!sock->home) continue; /* skip UDP sockets */
3763
3764                         when = now;
3765
3766                         if (!sock->home->idle_timeout) {
3767                                 rad_assert(sock->home->lifetime != 0);
3768
3769                                 when.tv_sec += sock->home->lifetime;
3770                                 fun = tcp_socket_lifetime;
3771                         } else {
3772                                 rad_assert(sock->home->idle_timeout != 0);
3773
3774                                 when.tv_sec += sock->home->idle_timeout;
3775                                 fun = tcp_socket_idle_timeout;
3776                         }
3777
3778                         if (!fr_event_insert(el, fun, this, &when,
3779                                              &(sock->ev))) {
3780                                 rad_panic("Failed to insert event");
3781                         }
3782                 }
3783
3784                 PTHREAD_MUTEX_UNLOCK(&proxy_mutex);
3785         }
3786 #endif  /* WITH_PROXY */
3787 #endif  /* WITH_TCP */
3788 }
3789
3790 #ifndef WITH_SELF_PIPE
3791 void radius_signal_self(int flag)
3792 {
3793         handle_signal_self(flag);
3794 }
3795 #else
3796 /*
3797  *      Inform ourselves that we received a signal.
3798  */
3799 void radius_signal_self(int flag)
3800 {
3801         ssize_t rcode;
3802         uint8_t buffer[16];
3803
3804         /*
3805          *      The read MUST be non-blocking for this to work.
3806          */
3807         rcode = read(self_pipe[0], buffer, sizeof(buffer));
3808         if (rcode > 0) {
3809                 ssize_t i;
3810
3811                 for (i = 0; i < rcode; i++) {
3812                         buffer[0] |= buffer[i];
3813                 }
3814         } else {
3815                 buffer[0] = 0;
3816         }
3817
3818         buffer[0] |= flag;
3819
3820         write(self_pipe[1], buffer, 1);
3821 }
3822
3823
3824 static void event_signal_handler(UNUSED fr_event_list_t *xel,
3825                                  UNUSED int fd, UNUSED void *ctx)
3826 {
3827         ssize_t i, rcode;
3828         uint8_t buffer[32];
3829
3830         rcode = read(self_pipe[0], buffer, sizeof(buffer));
3831         if (rcode <= 0) return;
3832
3833         /*
3834          *      Merge pending signals.
3835          */
3836         for (i = 0; i < rcode; i++) {
3837                 buffer[0] |= buffer[i];
3838         }
3839
3840         handle_signal_self(buffer[0]);
3841 }
3842 #endif
3843
3844
3845 static void event_socket_handler(fr_event_list_t *xel, UNUSED int fd,
3846                                  void *ctx)
3847 {
3848         rad_listen_t *listener = ctx;
3849         RAD_REQUEST_FUNP fun;
3850         REQUEST *request;
3851
3852         rad_assert(xel == el);
3853
3854         xel = xel;
3855
3856         if (listener->fd < 0) rad_panic("Socket was closed on us!");
3857
3858         if (!listener->recv(listener, &fun, &request)) return;
3859
3860         if (!thread_pool_addrequest(request, fun)) {
3861                 request->child_state = REQUEST_DONE;
3862         }
3863 }
3864
3865
3866 /*
3867  *      This function is called periodically to see if this detail
3868  *      file is available for reading.
3869  */
3870 static void event_poll_detail(void *ctx)
3871 {
3872         int rcode, delay;
3873         RAD_REQUEST_FUNP fun;
3874         REQUEST *request;
3875         rad_listen_t *this = ctx;
3876         struct timeval when;
3877         listen_detail_t *detail = this->data;
3878
3879         rad_assert(this->type == RAD_LISTEN_DETAIL);
3880
3881         /*
3882          *      Try to read something.
3883          *
3884          *      FIXME: This does poll AND receive.
3885          */
3886         rcode = this->recv(this, &fun, &request);
3887         if (rcode != 0) {
3888                 rad_assert(fun != NULL);
3889                 rad_assert(request != NULL);
3890
3891                 if (!thread_pool_addrequest(request, fun)) {
3892                         request->child_state = REQUEST_DONE;
3893                 }
3894         }
3895
3896         fr_event_now(el, &now);
3897         when = now;
3898
3899         /*
3900          *      Backdoor API to get the delay until the next poll
3901          *      time.
3902          */
3903         delay = this->encode(this, NULL);
3904         tv_add(&when, delay);
3905
3906         if (!fr_event_insert(el, event_poll_detail, this,
3907                              &when, &detail->ev)) {
3908                 radlog(L_ERR, "Failed creating handler");
3909                 exit(1);
3910         }
3911 }
3912
3913
3914 static void event_status(struct timeval *wake)
3915 {
3916 #if !defined(HAVE_PTHREAD_H) && defined(WNOHANG)
3917         int argval;
3918 #endif
3919
3920         if (debug_flag == 0) {
3921                 if (just_started) {
3922                         radlog(L_INFO, "Ready to process requests.");
3923                         just_started = FALSE;
3924                 }
3925                 return;
3926         }
3927
3928         if (!wake) {
3929                 radlog(L_INFO, "Ready to process requests.");
3930
3931         } else if ((wake->tv_sec != 0) ||
3932                    (wake->tv_usec >= 100000)) {
3933                 DEBUG("Waking up in %d.%01u seconds.",
3934                       (int) wake->tv_sec, (unsigned int) wake->tv_usec / 100000);
3935         }
3936
3937
3938         /*
3939          *      FIXME: Put this somewhere else, where it isn't called
3940          *      all of the time...
3941          */
3942
3943 #if !defined(HAVE_PTHREAD_H) && defined(WNOHANG)
3944         /*
3945          *      If there are no child threads, then there may
3946          *      be child processes.  In that case, wait for
3947          *      their exit status, and throw that exit status
3948          *      away.  This helps get rid of zxombie children.
3949          */
3950         while (waitpid(-1, &argval, WNOHANG) > 0) {
3951                 /* do nothing */
3952         }
3953 #endif
3954
3955 }
3956
3957 /*
3958  *      Externally-visibly functions.
3959  */
3960 int radius_event_init(CONF_SECTION *cs, int spawn_flag)
3961 {
3962         rad_listen_t *head = NULL;
3963
3964         if (el) return 0;
3965
3966         time(&fr_start_time);
3967
3968         el = fr_event_list_create(event_status);
3969         if (!el) return 0;
3970
3971         pl = fr_packet_list_create(0);
3972         if (!pl) return 0;      /* leak el */
3973
3974         request_num_counter = 0;
3975
3976 #ifdef WITH_PROXY
3977         if (mainconfig.proxy_requests) {
3978                 /*
3979                  *      Create the tree for managing proxied requests and
3980                  *      responses.
3981                  */
3982                 proxy_list = fr_packet_list_create(1);
3983                 if (!proxy_list) return 0;
3984
3985 #ifdef HAVE_PTHREAD_H
3986                 if (pthread_mutex_init(&proxy_mutex, NULL) != 0) {
3987                         radlog(L_ERR, "FATAL: Failed to initialize proxy mutex: %s",
3988                                strerror(errno));
3989                         exit(1);
3990                 }
3991 #endif
3992         }
3993 #endif
3994
3995 #ifdef HAVE_PTHREAD_H
3996 #ifndef __MINGW32__
3997         NO_SUCH_CHILD_PID = (pthread_t ) (0);
3998 #else
3999         NO_SUCH_CHILD_PID = pthread_self(); /* not a child thread */
4000 #endif
4001         /*
4002          *      Initialize the threads ONLY if we're spawning, AND
4003          *      we're running normally.
4004          */
4005         if (spawn_flag && !check_config &&
4006             (thread_pool_init(cs, &spawn_flag) < 0)) {
4007                 exit(1);
4008         }
4009 #endif
4010
4011         /*
4012          *      Move all of the thread calls to this file?
4013          *
4014          *      It may be best for the mutexes to be in this file...
4015          */
4016         have_children = spawn_flag;
4017
4018         if (check_config) {
4019                 DEBUG("%s: #### Skipping IP addresses and Ports ####",
4020                        mainconfig.name);
4021                 return 1;
4022         }
4023
4024 #ifdef WITH_SELF_PIPE
4025         /*
4026          *      Child threads need a pipe to signal us, as do the
4027          *      signal handlers.
4028          */
4029         if (pipe(self_pipe) < 0) {
4030                 radlog(L_ERR, "radiusd: Error opening internal pipe: %s",
4031                        strerror(errno));
4032                 exit(1);
4033         }
4034         if (fcntl(self_pipe[0], F_SETFL, O_NONBLOCK | FD_CLOEXEC) < 0) {
4035                 radlog(L_ERR, "radiusd: Error setting internal flags: %s",
4036                        strerror(errno));
4037                 exit(1);
4038         }
4039         if (fcntl(self_pipe[1], F_SETFL, O_NONBLOCK | FD_CLOEXEC) < 0) {
4040                 radlog(L_ERR, "radiusd: Error setting internal flags: %s",
4041                        strerror(errno));
4042                 exit(1);
4043         }
4044
4045         if (!fr_event_fd_insert(el, 0, self_pipe[0],
4046                                   event_signal_handler, el)) {
4047                 radlog(L_ERR, "Failed creating handler for signals");
4048                 exit(1);
4049         }
4050 #endif  /* WITH_SELF_PIPE */
4051
4052        DEBUG("%s: #### Opening IP addresses and Ports ####",
4053                mainconfig.name);
4054
4055        /*
4056         *       The server temporarily switches to an unprivileged
4057         *       user very early in the bootstrapping process.
4058         *       However, some sockets MAY require privileged access
4059         *       (bind to device, or to port < 1024, or to raw
4060         *       sockets).  Those sockets need to call suid up/down
4061         *       themselves around the functions that need a privileged
4062         *       uid.
4063         */
4064         if (listen_init(cs, &head) < 0) {
4065                 _exit(1);
4066         }
4067
4068         mainconfig.listen = head;
4069
4070         /*
4071          *      At this point, no one has any business *ever* going
4072          *      back to root uid.
4073          */
4074         fr_suid_down_permanent();
4075
4076         return 1;
4077 }
4078
4079
4080 static int request_hash_cb(UNUSED void *ctx, void *data)
4081 {
4082         REQUEST *request = fr_packet2myptr(REQUEST, packet, data);
4083
4084 #ifdef WITH_PROXY
4085         rad_assert(request->in_proxy_hash == FALSE);
4086 #endif
4087
4088         ev_request_free(&request);
4089
4090         return 0;
4091 }
4092
4093
4094 #ifdef WITH_PROXY
4095 static int proxy_hash_cb(UNUSED void *ctx, void *data)
4096 {
4097         REQUEST *request = fr_packet2myptr(REQUEST, proxy, data);
4098
4099         ev_request_free(&request);
4100
4101         return 0;
4102 }
4103 #endif
4104
4105 void radius_event_free(void)
4106 {
4107         /*
4108          *      FIXME: Stop all threads, or at least check that
4109          *      they're all waiting on the semaphore, and the queues
4110          *      are empty.
4111          */
4112
4113 #ifdef WITH_PROXY
4114         /*
4115          *      There are requests in the proxy hash that aren't
4116          *      referenced from anywhere else.  Remove them first.
4117          */
4118         if (proxy_list) {
4119                 fr_packet_list_walk(proxy_list, NULL, proxy_hash_cb);
4120                 fr_packet_list_free(proxy_list);
4121                 proxy_list = NULL;
4122         }
4123 #endif
4124
4125         fr_packet_list_walk(pl, NULL, request_hash_cb);
4126
4127         fr_packet_list_free(pl);
4128         pl = NULL;
4129
4130         fr_event_list_free(el);
4131 }
4132
4133 int radius_event_process(void)
4134 {
4135         if (!el) return 0;
4136
4137         return fr_event_loop(el);
4138 }
4139
4140 void radius_handle_request(REQUEST *request, RAD_REQUEST_FUNP fun)
4141 {
4142         request->options = RAD_REQUEST_OPTION_DEBUG2;
4143
4144         if (request_pre_handler(request)) {
4145                 rad_assert(fun != NULL);
4146                 rad_assert(request != NULL);
4147
4148                 if (request->server) RDEBUG("server %s {",
4149                                             request->server != NULL ?
4150                                             request->server : "");
4151                 fun(request);
4152
4153                 if (request->server) RDEBUG("} # server %s",
4154                                              request->server != NULL ?
4155                                             request->server : "");
4156
4157                 request_post_handler(request);
4158         }
4159
4160         DEBUG2("Going to the next request");
4161         return;
4162 }