src/main/event.c

   1 /*
   2  * event.c      Server event handling
   3  *
   4  * Version:     $Id$
   5  *
   6  *   This program is free software; you can redistribute it and/or modify
   7  *   it under the terms of the GNU General Public License as published by
   8  *   the Free Software Foundation; either version 2 of the License, or
   9  *   (at your option) any later version.
  10  *
  11  *   This program is distributed in the hope that it will be useful,
  12  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  *   GNU General Public License for more details.
  15  *
  16  *   You should have received a copy of the GNU General Public License
  17  *   along with this program; if not, write to the Free Software
  18  *   Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
  19  *
  20  * Copyright 2007  The FreeRADIUS server project
  21  * Copyright 2007  Alan DeKok <aland@deployingradius.com>
  22  */
  23
  24 #include <freeradius-devel/ident.h>
  25 RCSID("$Id$")
  26
  27 #include <freeradius-devel/radiusd.h>
  28 #include <freeradius-devel/modules.h>
  29 #include <freeradius-devel/event.h>
  30 #include <freeradius-devel/detail.h>
  31
  32 #include <freeradius-devel/rad_assert.h>
  33
  34 #include <signal.h>
  35 #include <fcntl.h>
  36
  37 #ifdef HAVE_SYS_WAIT_H
  38 #       include <sys/wait.h>
  39 #endif
  40
  41 #define USEC (1000000)
  42
  43 extern pid_t radius_pid;
  44 extern int dont_fork;
  45 extern int check_config;
  46 extern void force_log_reopen(void);
  47 extern char *debug_condition;
  48
  49 /*
  50  *      Ridiculous amounts of local state.
  51  */
  52 static fr_event_list_t  *el = NULL;
  53 static fr_packet_list_t *pl = NULL;
  54 static int                      request_num_counter = 0;
  55 static struct timeval           now;
  56 time_t                          fr_start_time;
  57 static int                      have_children;
  58 static int                      just_started = TRUE;
  59
  60 #ifndef __MINGW32__
  61 static int self_pipe[2];
  62 #endif
  63
  64 #ifdef HAVE_PTHREAD_H
  65 #ifdef WITH_PROXY
  66 static pthread_mutex_t  proxy_mutex;
  67 static rad_listen_t *proxy_listener_list = NULL;
  68 #endif
  69
  70 #define PTHREAD_MUTEX_LOCK if (have_children) pthread_mutex_lock
  71 #define PTHREAD_MUTEX_UNLOCK if (have_children) pthread_mutex_unlock
  72
  73 static pthread_t NO_SUCH_CHILD_PID;
  74 #else
  75 /*
  76  *      This is easier than ifdef's throughout the code.
  77  */
  78 #define PTHREAD_MUTEX_LOCK(_x)
  79 #define PTHREAD_MUTEX_UNLOCK(_x)
  80 int thread_pool_addrequest(REQUEST *request, RAD_REQUEST_FUNP fun)
  81 {
  82         request->process = fun;
  83         radius_handle_request(request, fun);
  84         return 1;
  85 }
  86 #endif
  87
  88 /*
  89  *      We need mutexes around the event FD list *only* in certain
  90  *      cases.
  91  */
  92 #if defined (HAVE_PTHREAD_H) && (defined(WITH_PROXY) || defined(WITH_TCP))
  93 static pthread_mutex_t  fd_mutex;
  94 #define FD_MUTEX_LOCK if (have_children) pthread_mutex_lock
  95 #define FD_MUTEX_UNLOCK if (have_children) pthread_mutex_unlock
  96 #else
  97 /*
  98  *      This is easier than ifdef's throughout the code.
  99  */
 100 #define FD_MUTEX_LOCK(_x)
 101 #define FD_MUTEX_UNLOCK(_x)
 102 #endif
 103
 104
 105 #define INSERT_EVENT(_function, _ctx) if (!fr_event_insert(el, _function, _ctx, &((_ctx)->when), &((_ctx)->ev))) { _rad_panic(__FILE__, __LINE__, "Failed to insert event"); }
 106
 107 #ifdef WITH_PROXY
 108 static fr_packet_list_t *proxy_list = NULL;
 109 static void remove_from_proxy_hash(REQUEST *request);
 110
 111 static void check_for_zombie_home_server(REQUEST *request);
 112 #else
 113 #define remove_from_proxy_hash(foo)
 114 #endif
 115
 116 static void request_post_handler(REQUEST *request);
 117 static void wait_a_bit(void *ctx);
 118 static void event_socket_handler(fr_event_list_t *xel, UNUSED int fd, void *ctx);
 119 #ifdef WITH_DETAIL
 120 static void event_poll_detail(void *ctx);
 121 #endif
 122
 123 static void NEVER_RETURNS _rad_panic(const char *file, unsigned int line,
 124                                     const char *msg)
 125 {
 126         radlog(L_ERR, "[%s:%d] %s", file, line, msg);
 127         _exit(1);
 128 }
 129
 130 #define rad_panic(x) _rad_panic(__FILE__, __LINE__, x)
 131
 132
 133 static void tv_add(struct timeval *tv, int usec_delay)
 134 {
 135         if (usec_delay > USEC) {
 136                 tv->tv_sec += usec_delay / USEC;
 137                 usec_delay %= USEC;
 138         }
 139         tv->tv_usec += usec_delay;
 140
 141         if (tv->tv_usec > USEC) {
 142                 tv->tv_usec -= USEC;
 143                 tv->tv_sec++;
 144         }
 145 }
 146
 147 static void remove_from_request_hash(REQUEST *request)
 148 {
 149         if (!request->in_request_hash) return;
 150
 151         fr_packet_list_yank(pl, request->packet);
 152         request->in_request_hash = FALSE;
 153
 154         request_stats_final(request);
 155
 156 #ifdef WITH_TCP
 157         request->listener->count--;
 158 #endif
 159 }
 160
 161 #ifdef WITH_PROXY
 162 static REQUEST *lookup_in_proxy_hash(RADIUS_PACKET *reply)
 163 {
 164         int done = FALSE;
 165         RADIUS_PACKET **proxy_p;
 166         REQUEST *request;
 167
 168         PTHREAD_MUTEX_LOCK(&proxy_mutex);
 169         proxy_p = fr_packet_list_find_byreply(proxy_list, reply);
 170
 171         if (!proxy_p) {
 172                 PTHREAD_MUTEX_UNLOCK(&proxy_mutex);
 173                 return NULL;
 174         }
 175
 176         request = fr_packet2myptr(REQUEST, proxy, proxy_p);
 177         request->num_proxied_responses++; /* needs to be protected by lock */
 178
 179         done = (request->num_proxied_requests == request->num_proxied_responses);
 180         PTHREAD_MUTEX_UNLOCK(&proxy_mutex);
 181
 182
 183         /*
 184          *      Catch the most common case of everything working
 185          *      correctly.
 186          */
 187         if (done) remove_from_proxy_hash(request);
 188
 189         return request;
 190 }
 191
 192
 193 static void remove_from_proxy_hash(REQUEST *request)
 194 {
 195         /*
 196          *      Check this without grabbing the mutex because it's a
 197          *      lot faster that way.
 198          */
 199         if (!request->in_proxy_hash) return;
 200
 201         /*
 202          *      The "not in hash" flag is definitive.  However, if the
 203          *      flag says that it IS in the hash, there might still be
 204          *      a race condition where it isn't.
 205          */
 206         PTHREAD_MUTEX_LOCK(&proxy_mutex);
 207
 208         if (!request->in_proxy_hash) {
 209                 PTHREAD_MUTEX_UNLOCK(&proxy_mutex);
 210                 return;
 211         }
 212
 213         fr_packet_list_yank(proxy_list, request->proxy);
 214         fr_packet_list_id_free(proxy_list, request->proxy);
 215
 216         /*
 217          *      On the FIRST reply, decrement the count of outstanding
 218          *      requests.  Note that this is NOT the count of sent
 219          *      packets, but whether or not the home server has
 220          *      responded at all.
 221          */
 222         if (!request->proxy_reply &&
 223             request->home_server &&
 224             request->home_server->currently_outstanding) {
 225                 request->home_server->currently_outstanding--;
 226         }
 227
 228 #ifdef WITH_TCP
 229         request->proxy_listener->count--;
 230         request->proxy_listener = NULL;
 231 #endif
 232
 233         /*
 234          *      Got from YES in hash, to NO, not in hash while we hold
 235          *      the mutex.  This guarantees that when another thread
 236          *      grabs the mutex, the "not in hash" flag is correct.
 237          */
 238         request->in_proxy_hash = FALSE;
 239
 240         PTHREAD_MUTEX_UNLOCK(&proxy_mutex);
 241 }
 242 #endif  /* WITH_PROXY */
 243
 244 static void ev_request_free(REQUEST **prequest)
 245 {
 246         REQUEST *request;
 247
 248         if (!prequest || !*prequest) return;
 249
 250         request = *prequest;
 251
 252 #ifdef WITH_COA
 253         if (request->coa) {
 254                 /*
 255                  *      Divorce the child from the parent first,
 256                  *      then clean up the child.
 257                  */
 258                 request->coa->parent = NULL;
 259                 ev_request_free(&request->coa);
 260         }
 261
 262         /*
 263          *      Divorce the parent from the child, and leave the
 264          *      parent still alive.
 265          */
 266         if (request->parent && (request->parent->coa == request)) {
 267                 request->parent->coa = NULL;
 268         }
 269 #endif
 270
 271         if (request->ev) fr_event_delete(el, &request->ev);
 272 #ifdef WITH_PROXY
 273         if (request->in_proxy_hash) remove_from_proxy_hash(request);
 274 #endif
 275         if (request->in_request_hash) remove_from_request_hash(request);
 276
 277         request_free(prequest);
 278 }
 279
 280 #ifdef WITH_TCP
 281 static int remove_all_requests(void *ctx, void *data)
 282 {
 283         rad_listen_t *this = ctx;
 284         RADIUS_PACKET **packet_p = data;
 285         REQUEST *request;
 286
 287         request = fr_packet2myptr(REQUEST, packet, packet_p);
 288         if (request->packet->sockfd != this->fd) return 0;
 289
 290         switch (request->child_state) {
 291         case REQUEST_RUNNING:
 292                 rad_assert(request->ev != NULL); /* or it's lost forever */
 293         case REQUEST_QUEUED:
 294                 request->master_state = REQUEST_STOP_PROCESSING;
 295                 return 0;
 296
 297                 /*
 298                  *      Waiting for a reply.  There's no point in
 299                  *      doing anything else.  We remove it from the
 300                  *      request hash so that we can close the upstream
 301                  *      socket.
 302                  */
 303         case REQUEST_PROXIED:
 304                 remove_from_request_hash(request);
 305                 request->child_state = REQUEST_DONE;
 306                 return 0;
 307
 308         case REQUEST_REJECT_DELAY:
 309         case REQUEST_CLEANUP_DELAY:
 310         case REQUEST_DONE:
 311                 ev_request_free(&request);
 312                 break;
 313         }
 314
 315         return 0;
 316 }
 317
 318 #ifdef WITH_PROXY
 319 static int remove_all_proxied_requests(void *ctx, void *data)
 320 {
 321         rad_listen_t *this = ctx;
 322         RADIUS_PACKET **proxy_p = data;
 323         REQUEST *request;
 324
 325         request = fr_packet2myptr(REQUEST, proxy, proxy_p);
 326         if (request->proxy->sockfd != this->fd) return 0;
 327
 328         switch (request->child_state) {
 329         case REQUEST_RUNNING:
 330                 rad_assert(request->ev != NULL); /* or it's lost forever */
 331         case REQUEST_QUEUED:
 332                 request->master_state = REQUEST_STOP_PROCESSING;
 333                 return 0;
 334
 335                 /*
 336                  *      Eventually we will discover that there is no
 337                  *      response to the proxied request.
 338                  */
 339         case REQUEST_PROXIED:
 340                 break;
 341
 342                 /*
 343                  *      Keep it in the cache for duplicate detection.
 344                  */
 345         case REQUEST_REJECT_DELAY:
 346         case REQUEST_CLEANUP_DELAY:
 347         case REQUEST_DONE:
 348                 break;
 349         }
 350
 351         remove_from_proxy_hash(request);
 352         return 0;
 353 }
 354 #endif  /* WITH_PROXY */
 355 #endif  /* WITH_TCP */
 356
 357
 358 #ifdef WITH_PROXY
 359 static int insert_into_proxy_hash(REQUEST *request)
 360 {
 361         char buf[128];
 362         int rcode, tries;
 363         void *proxy_listener;
 364
 365         rad_assert(request->proxy != NULL);
 366         rad_assert(proxy_list != NULL);
 367
 368         tries = 1;
 369 retry:
 370         PTHREAD_MUTEX_LOCK(&proxy_mutex);
 371         rcode = fr_packet_list_id_alloc(proxy_list,
 372                                         request->home_server->proto,
 373                                         request->proxy, &proxy_listener);
 374         PTHREAD_MUTEX_UNLOCK(&proxy_mutex);
 375
 376         if (!rcode) {
 377                 /*
 378                  *      Also locks the proxy mutex, so we have to call
 379                  *      it with the mutex unlocked.  Some systems
 380                  *      don't support recursive mutexes.
 381                  */
 382                 if (!proxy_new_listener(request->home_server, 0)) {
 383                         radlog(L_ERR, "Failed to create a new socket for proxying requests.");
 384                         return 0;
 385                 }
 386                 request->proxy->src_port = 0; /* Use any new socket */
 387
 388                 tries++;
 389                 if (tries > 2) {
 390                         RDEBUG2("ERROR: Failed allocating Id for new socket when proxying requests.");
 391                         return 0;
 392                 }
 393
 394                 goto retry;
 395         }
 396
 397         request->proxy_listener = proxy_listener;
 398
 399         PTHREAD_MUTEX_LOCK(&proxy_mutex);
 400         if (!fr_packet_list_insert(proxy_list, &request->proxy)) {
 401                 fr_packet_list_id_free(proxy_list, request->proxy);
 402                 PTHREAD_MUTEX_UNLOCK(&proxy_mutex);
 403                 radlog(L_PROXY, "Failed to insert entry into proxy list");
 404                 return 0;
 405         }
 406
 407         request->in_proxy_hash = TRUE;
 408
 409         /*
 410          *      Keep track of maximum outstanding requests to a
 411          *      particular home server.  'max_outstanding' is
 412          *      enforced in home_server_ldb(), in realms.c.
 413          */
 414         if (request->home_server) {
 415                 request->home_server->currently_outstanding++;
 416         }
 417
 418 #ifdef WITH_TCP
 419         request->proxy_listener->count++;
 420 #endif
 421
 422         PTHREAD_MUTEX_UNLOCK(&proxy_mutex);
 423
 424         RDEBUG3(" proxy: allocating destination %s port %d - Id %d",
 425                inet_ntop(request->proxy->dst_ipaddr.af,
 426                          &request->proxy->dst_ipaddr.ipaddr, buf, sizeof(buf)),
 427                request->proxy->dst_port,
 428                request->proxy->id);
 429
 430         return 1;
 431 }
 432
 433
 434 /*
 435  *      Called as BOTH an event, and in-line from other functions.
 436  */
 437 static void wait_for_proxy_id_to_expire(void *ctx)
 438 {
 439         REQUEST *request = ctx;
 440
 441         rad_assert(request->magic == REQUEST_MAGIC);
 442         rad_assert(request->proxy != NULL);
 443
 444         if (!fr_event_now(el, &now)) gettimeofday(&now, NULL);
 445         request->when = request->proxy_when;
 446
 447 #ifdef WITH_COA
 448         if (((request->proxy->code == PW_COA_REQUEST) ||
 449              (request->proxy->code == PW_DISCONNECT_REQUEST)) &&
 450             (request->packet->code != request->proxy->code)) {
 451                 request->when.tv_sec += request->home_server->coa_mrd;
 452         } else
 453 #endif
 454         request->when.tv_sec += request->home_server->response_window;
 455
 456         if ((request->num_proxied_requests == request->num_proxied_responses) ||
 457 #ifdef WITH_TCP
 458             (request->home_server->proto == IPPROTO_TCP) ||
 459 #endif
 460             timercmp(&now, &request->when, >)) {
 461                 if (request->packet) {
 462                         RDEBUG2("Cleaning up request %d ID %d with timestamp +%d",
 463                                request->number, request->packet->id,
 464                                (unsigned int) (request->timestamp - fr_start_time));
 465                 } else {
 466                         RDEBUG2("Cleaning up request %d with timestamp +%d",
 467                                request->number,
 468                                (unsigned int) (request->timestamp - fr_start_time));
 469                 }
 470
 471                 ev_request_free(&request);
 472                 return;
 473         }
 474
 475         INSERT_EVENT(wait_for_proxy_id_to_expire, request);
 476 }
 477 #endif
 478
 479 #ifdef HAVE_PTHREAD_H
 480 static void wait_for_child_to_die(void *ctx)
 481 {
 482         REQUEST *request = ctx;
 483
 484         rad_assert(request->magic == REQUEST_MAGIC);
 485
 486         if ((request->child_state == REQUEST_QUEUED) ||
 487             (request->child_state == REQUEST_RUNNING)) {
 488                 request->delay += (request->delay >> 1);
 489                 tv_add(&request->when, request->delay);
 490
 491                 RDEBUG2("Child is still stuck for request %d", request->number);
 492
 493                 INSERT_EVENT(wait_for_child_to_die, request);
 494                 return;
 495         }
 496
 497         RDEBUG2("Child is responsive for request %d", request->number);
 498         remove_from_request_hash(request);
 499
 500 #ifdef WITH_PROXY
 501         if (request->proxy) {
 502                 wait_for_proxy_id_to_expire(request);
 503                 return;
 504         }
 505 #endif
 506
 507         ev_request_free(&request);
 508 }
 509 #endif
 510
 511 static void cleanup_delay(void *ctx)
 512 {
 513         REQUEST *request = ctx;
 514
 515         rad_assert(request->magic == REQUEST_MAGIC);
 516         rad_assert((request->child_state == REQUEST_CLEANUP_DELAY) ||
 517                    (request->child_state == REQUEST_DONE));
 518
 519         remove_from_request_hash(request);
 520
 521 #ifdef WITH_PROXY
 522         if (request->proxy && request->in_proxy_hash) {
 523                 wait_for_proxy_id_to_expire(request);
 524                 return;
 525         }
 526 #endif
 527
 528         RDEBUG2("Cleaning up request %d ID %d with timestamp +%d",
 529                request->number, request->packet->id,
 530                (unsigned int) (request->timestamp - fr_start_time));
 531
 532         ev_request_free(&request);
 533 }
 534
 535
 536 /*
 537  *      In daemon mode, AND this request has debug flags set.
 538  */
 539 #define DEBUG_PACKET if (!debug_flag && request->options && request->radlog) debug_packet
 540
 541 static void debug_packet(REQUEST *request, RADIUS_PACKET *packet, int direction)
 542 {
 543         VALUE_PAIR *vp;
 544         char buffer[1024];
 545         const char *received, *from;
 546         const fr_ipaddr_t *ip;
 547         int port;
 548
 549         if (!packet || (packet->code == 0)) return;
 550
 551         rad_assert(request->radlog != NULL);
 552
 553         if (direction == 0) {
 554                 received = "Received";
 555                 from = "from";  /* what else? */
 556                 ip = &packet->src_ipaddr;
 557                 port = packet->src_port;
 558
 559         } else {
 560                 received = "Sending";
 561                 from = "to";    /* hah! */
 562                 ip = &packet->dst_ipaddr;
 563                 port = packet->dst_port;
 564         }
 565
 566         /*
 567          *      Client-specific debugging re-prints the input
 568          *      packet into the client log.
 569          *
 570          *      This really belongs in a utility library
 571          */
 572         if ((packet->code > 0) && (packet->code < FR_MAX_PACKET_CODE)) {
 573                 RDEBUG("%s %s packet %s host %s port %d, id=%d, length=%d",
 574                        received, fr_packet_codes[packet->code], from,
 575                        inet_ntop(ip->af, &ip->ipaddr, buffer, sizeof(buffer)),
 576                        port, packet->id, packet->data_len);
 577         } else {
 578                 RDEBUG("%s packet %s host %s port %d code=%d, id=%d, length=%d",
 579                        received, from,
 580                        inet_ntop(ip->af, &ip->ipaddr, buffer, sizeof(buffer)),
 581                        port,
 582                        packet->code, packet->id, packet->data_len);
 583         }
 584
 585         for (vp = packet->vps; vp != NULL; vp = vp->next) {
 586                 vp_prints(buffer, sizeof(buffer), vp);
 587                 request->radlog(L_DBG, 0, request, "\t%s", buffer);
 588         }
 589 }
 590
 591 static void reject_delay(void *ctx)
 592 {
 593         REQUEST *request = ctx;
 594
 595         rad_assert(request->magic == REQUEST_MAGIC);
 596         rad_assert(request->child_state == REQUEST_REJECT_DELAY);
 597
 598         RDEBUG2("Sending delayed reject for request %d", request->number);
 599
 600         DEBUG_PACKET(request, request->reply, 1);
 601
 602         request->listener->send(request->listener, request);
 603
 604         request->when.tv_sec += request->root->cleanup_delay;
 605         request->child_state = REQUEST_CLEANUP_DELAY;
 606
 607         INSERT_EVENT(cleanup_delay, request);
 608 }
 609
 610
 611 #ifdef WITH_PROXY
 612 void revive_home_server(void *ctx)
 613 {
 614         home_server *home = ctx;
 615         char buffer[128];
 616
 617 #ifdef WITH_TCP
 618         rad_assert(home->proto != IPPROTO_TCP);
 619 #endif
 620
 621         home->state = HOME_STATE_ALIVE;
 622         home->currently_outstanding = 0;
 623         home->revive_time = now;
 624
 625         /*
 626          *      Delete any outstanding events.
 627          */
 628         if (home->ev) fr_event_delete(el, &home->ev);
 629
 630         radlog(L_INFO, "PROXY: Marking home server %s port %d alive again... we have no idea if it really is alive or not.",
 631                inet_ntop(home->ipaddr.af, &home->ipaddr.ipaddr,
 632                          buffer, sizeof(buffer)),
 633                home->port);
 634
 635 }
 636
 637
 638 static void no_response_to_ping(void *ctx)
 639 {
 640         REQUEST *request = ctx;
 641         home_server *home;
 642         char buffer[128];
 643
 644         rad_assert(request->home_server != NULL);
 645
 646         home = request->home_server;
 647 #ifdef WITH_TCP
 648         rad_assert(home->proto != IPPROTO_TCP);
 649 #endif
 650
 651         home->num_received_pings = 0;
 652
 653         radlog(L_ERR, "No response to status check %d for home server %s port %d",
 654                request->number,
 655                inet_ntop(request->proxy->dst_ipaddr.af,
 656                          &request->proxy->dst_ipaddr.ipaddr,
 657                          buffer, sizeof(buffer)),
 658                request->proxy->dst_port);
 659
 660         check_for_zombie_home_server(request);
 661
 662         wait_for_proxy_id_to_expire(request);
 663 }
 664
 665
 666 static void received_response_to_ping(REQUEST *request)
 667 {
 668         home_server *home;
 669         char buffer[128];
 670
 671         rad_assert(request->home_server != NULL);
 672
 673         home = request->home_server;
 674 #ifdef WITH_TCP
 675         rad_assert(home->proto != IPPROTO_TCP);
 676 #endif
 677
 678         home->num_received_pings++;
 679
 680         radlog(L_PROXY, "Received response to status check %d (%d in current sequence)",
 681                request->number, home->num_received_pings);
 682
 683         /*
 684          *      Remove the request from any hashes
 685          */
 686         fr_event_delete(el, &request->ev);
 687         remove_from_proxy_hash(request);
 688         rad_assert(request->in_request_hash == FALSE);
 689
 690         /*
 691          *      The control socket may have marked the home server as
 692          *      alive.  OR, it may have suddenly started responding to
 693          *      requests again.  If so, don't re-do the "make alive"
 694          *      work.
 695          */
 696         if (home->state == HOME_STATE_ALIVE) return;
 697
 698         /*
 699          *      We haven't received enough ping responses to mark it
 700          *      "alive".  Wait a bit.
 701          */
 702         if (home->num_received_pings < home->num_pings_to_alive) {
 703                 return;
 704         }
 705
 706         home->state = HOME_STATE_ALIVE;
 707         home->currently_outstanding = 0;
 708         home->revive_time = now;
 709
 710         if (!fr_event_delete(el, &home->ev)) {
 711                 RDEBUG2("Hmm... no event for home server.  Oh well.");
 712         }
 713
 714         radlog(L_PROXY, "Marking home server %s port %d alive",
 715                inet_ntop(request->proxy->dst_ipaddr.af,
 716                          &request->proxy->dst_ipaddr.ipaddr,
 717                          buffer, sizeof(buffer)),
 718                request->proxy->dst_port);
 719 }
 720
 721
 722 /*
 723  *      Called from start of zombie period, OR after control socket
 724  *      marks the home server dead.
 725  */
 726 static void ping_home_server(void *ctx)
 727 {
 728         uint32_t jitter;
 729         home_server *home = ctx;
 730         REQUEST *request;
 731         VALUE_PAIR *vp;
 732
 733 #ifdef WITH_TCP
 734         rad_assert(home->proto != IPPROTO_TCP);
 735 #endif
 736
 737         if ((home->state == HOME_STATE_ALIVE) ||
 738             (home->ping_check == HOME_PING_CHECK_NONE) ||
 739             (home->ev != NULL)) {
 740                 return;
 741         }
 742
 743         request = request_alloc();
 744         request->number = request_num_counter++;
 745
 746         request->proxy = rad_alloc(1);
 747         rad_assert(request->proxy != NULL);
 748
 749         fr_event_now(el, &request->when);
 750         home->when = request->when;
 751
 752         if (home->ping_check == HOME_PING_CHECK_STATUS_SERVER) {
 753                 request->proxy->code = PW_STATUS_SERVER;
 754
 755                 radius_pairmake(request, &request->proxy->vps,
 756                                 "Message-Authenticator", "0x00", T_OP_SET);
 757
 758         } else if (home->type == HOME_TYPE_AUTH) {
 759                 request->proxy->code = PW_AUTHENTICATION_REQUEST;
 760
 761                 radius_pairmake(request, &request->proxy->vps,
 762                                 "User-Name", home->ping_user_name, T_OP_SET);
 763                 radius_pairmake(request, &request->proxy->vps,
 764                                 "User-Password", home->ping_user_password, T_OP_SET);
 765                 radius_pairmake(request, &request->proxy->vps,
 766                                 "Service-Type", "Authenticate-Only", T_OP_SET);
 767                 radius_pairmake(request, &request->proxy->vps,
 768                                 "Message-Authenticator", "0x00", T_OP_SET);
 769
 770         } else {
 771 #ifdef WITH_ACCOUNTING
 772                 request->proxy->code = PW_ACCOUNTING_REQUEST;
 773
 774                 radius_pairmake(request, &request->proxy->vps,
 775                                 "User-Name", home->ping_user_name, T_OP_SET);
 776                 radius_pairmake(request, &request->proxy->vps,
 777                                 "Acct-Status-Type", "Stop", T_OP_SET);
 778                 radius_pairmake(request, &request->proxy->vps,
 779                                 "Acct-Session-Id", "00000000", T_OP_SET);
 780                 vp = radius_pairmake(request, &request->proxy->vps,
 781                                      "Event-Timestamp", "0", T_OP_SET);
 782                 vp->vp_date = now.tv_sec;
 783 #else
 784                 rad_assert("Internal sanity check failed");
 785 #endif
 786         }
 787
 788         radius_pairmake(request, &request->proxy->vps,
 789                         "NAS-Identifier", "Status Check. Are you alive?",
 790                         T_OP_SET);
 791
 792         request->proxy->dst_ipaddr = home->ipaddr;
 793         request->proxy->dst_port = home->port;
 794         request->home_server = home;
 795
 796         rad_assert(request->proxy_listener == NULL);
 797
 798         if (!insert_into_proxy_hash(request)) {
 799                 radlog(L_PROXY, "Failed inserting status check %d into proxy hash.  Discarding it.",
 800                        request->number);
 801                 ev_request_free(&request);
 802                 return;
 803         }
 804         rad_assert(request->proxy_listener != NULL);
 805         request->proxy_listener->send(request->proxy_listener,
 806                                       request);
 807
 808         request->next_callback = NULL;
 809         request->child_state = REQUEST_PROXIED;
 810         request->when.tv_sec += home->ping_timeout;;
 811
 812         INSERT_EVENT(no_response_to_ping, request);
 813
 814         /*
 815          *      Add +/- 2s of jitter, as suggested in RFC 3539
 816          *      and in the Issues and Fixes draft.
 817          */
 818         home->when.tv_sec += home->ping_interval - 2;
 819
 820         jitter = fr_rand();
 821         jitter ^= (jitter >> 10);
 822         jitter &= ((1 << 23) - 1); /* 22 bits of 1 */
 823
 824         tv_add(&home->when, jitter);
 825
 826         INSERT_EVENT(ping_home_server, home);
 827 }
 828
 829
 830 void mark_home_server_dead(home_server *home, struct timeval *when)
 831 {
 832         int previous_state = home->state;
 833         char buffer[128];
 834
 835         radlog(L_INFO, "PROXY: Marking home server %s port %d as dead.",
 836                inet_ntop(home->ipaddr.af, &home->ipaddr.ipaddr,
 837                          buffer, sizeof(buffer)),
 838                home->port);
 839
 840         home->state = HOME_STATE_IS_DEAD;
 841         home->num_received_pings = 0;
 842
 843         if (home->ping_check != HOME_PING_CHECK_NONE) {
 844                 /*
 845                  *      If the control socket marks us dead, start
 846                  *      pinging.  Otherwise, we already started
 847                  *      pinging when it was marked "zombie".
 848                  */
 849                 if (previous_state == HOME_STATE_ALIVE) {
 850                         ping_home_server(home);
 851                 }
 852
 853         } else {
 854                 /*
 855                  *      Revive it after a fixed period of time.  This
 856                  *      is very, very, bad.
 857                  */
 858                 home->when = *when;
 859                 home->when.tv_sec += home->revive_interval;
 860
 861                 INSERT_EVENT(revive_home_server, home);
 862         }
 863 }
 864
 865 static void check_for_zombie_home_server(REQUEST *request)
 866 {
 867         home_server *home;
 868         struct timeval when;
 869
 870         home = request->home_server;
 871
 872         if (home->state != HOME_STATE_ZOMBIE) return;
 873
 874         when = home->zombie_period_start;
 875         when.tv_sec += home->zombie_period;
 876
 877         fr_event_now(el, &now);
 878         if (timercmp(&now, &when, <)) {
 879                 return;
 880         }
 881
 882         mark_home_server_dead(home, &request->when);
 883 }
 884
 885 static int proxy_to_virtual_server(REQUEST *request);
 886
 887 static int virtual_server_handler(UNUSED REQUEST *request)
 888 {
 889         proxy_to_virtual_server(request);
 890         return 0;
 891 }
 892
 893 static void proxy_fallback_handler(REQUEST *request)
 894 {
 895         /*
 896          *      A proper time is required for wait_a_bit.
 897          */
 898         request->delay = USEC / 10;
 899         gettimeofday(&now, NULL);
 900         request->next_when = now;
 901         tv_add(&request->next_when, request->delay);
 902         request->next_callback = wait_a_bit;
 903
 904         /*
 905          *      Re-queue the request.
 906          */
 907         request->child_state = REQUEST_QUEUED;
 908
 909         rad_assert(request->proxy != NULL);
 910         if (!thread_pool_addrequest(request, virtual_server_handler)) {
 911                 request->child_state = REQUEST_DONE;
 912         }
 913
 914 #ifdef HAVE_PTHREAD_H
 915         /*
 916          *      MAY free the request if we're over max_request_time,
 917          *      AND we're not in threaded mode!
 918          *
 919          *      Note that we call this ONLY if we're threaded, as
 920          *      if we're NOT threaded, request_post_handler() calls
 921          *      wait_a_bit(), which means that "request" may not
 922          *      exist any more...
 923          */
 924         if (have_children) wait_a_bit(request);
 925 #endif
 926 }
 927
 928
 929 static int setup_post_proxy_fail(REQUEST *request)
 930 {
 931         DICT_VALUE *dval = NULL;
 932         VALUE_PAIR *vp;
 933
 934         request->child_state = REQUEST_RUNNING;
 935
 936         if (request->packet->code == PW_AUTHENTICATION_REQUEST) {
 937                 dval = dict_valbyname(PW_POST_PROXY_TYPE, "Fail-Authentication");
 938
 939         } else if (request->packet->code == PW_ACCOUNTING_REQUEST) {
 940                 dval = dict_valbyname(PW_POST_PROXY_TYPE, "Fail-Accounting");
 941
 942 #ifdef WITH_COA
 943                 /*
 944                  *      See no_response_to_coa_request
 945                  */
 946         } else if (((request->packet->code >> 8) & 0xff) == PW_COA_REQUEST) {
 947                 request->packet->code &= 0xff; /* restore it */
 948
 949                 if (request->proxy->code == PW_COA_REQUEST) {
 950                         dval = dict_valbyname(PW_POST_PROXY_TYPE, "Fail-CoA");
 951
 952                 } else if (request->proxy->code == PW_DISCONNECT_REQUEST) {
 953                         dval = dict_valbyname(PW_POST_PROXY_TYPE, "Fail-Disconnect");
 954                 } else {
 955                         return 0;
 956                 }
 957
 958 #endif
 959         } else {
 960                 return 0;
 961         }
 962
 963         if (!dval) dval = dict_valbyname(PW_POST_PROXY_TYPE, "Fail");
 964
 965         if (!dval) {
 966                 pairdelete(&request->config_items, PW_POST_PROXY_TYPE);
 967                 return 0;
 968         }
 969
 970         vp = pairfind(request->config_items, PW_POST_PROXY_TYPE);
 971         if (!vp) vp = radius_paircreate(request, &request->config_items,
 972                                         PW_POST_PROXY_TYPE, PW_TYPE_INTEGER);
 973         vp->vp_integer = dval->value;
 974
 975         rad_assert(request->proxy_reply == NULL);
 976
 977         return 1;
 978 }
 979
 980
 981 static int null_handler(UNUSED REQUEST *request)
 982 {
 983         return 0;
 984 }
 985
 986 static void post_proxy_fail_handler(REQUEST *request)
 987 {
 988         /*
 989          *      A proper time is required for wait_a_bit.
 990          */
 991         request->delay = USEC / 10;
 992         gettimeofday(&now, NULL);
 993
 994         /*
 995          *      Not set up to run Post-Proxy-Type = Fail.
 996          *
 997          *      Mark the request as still running, and figure out what
 998          *      to do next.
 999          */
1000         if (!setup_post_proxy_fail(request)) {
1001                 request_post_handler(request);
1002
1003         } else {
1004                 /*
1005                  *      Re-queue the request.
1006                  */
1007                 request->child_state = REQUEST_QUEUED;
1008
1009                 /*
1010                  *      There is a post-proxy-type of fail.  We run
1011                  *      the request through the pre/post proxy
1012                  *      handlers, just like it was a real proxied
1013                  *      request.  However, we set the per-request
1014                  *      handler to NULL, as we don't want to do
1015                  *      anything else.
1016                  *
1017                  *      Note that when we're not threaded, this will
1018                  *      process the request even if it's greater than
1019                  *      max_request_time.  That's not fatal.
1020                  */
1021                 request->priority = 0;
1022                 rad_assert(request->proxy != NULL);
1023                 thread_pool_addrequest(request, null_handler);
1024         }
1025
1026         /*
1027          *      MAY free the request if we're over max_request_time,
1028          *      AND we're not in threaded mode!
1029          *
1030          *      Note that we call this ONLY if we're threaded, as
1031          *      if we're NOT threaded, request_post_handler() calls
1032          *      wait_a_bit(), which means that "request" may not
1033          *      exist any more...
1034          */
1035         if (have_children) wait_a_bit(request);
1036 }
1037
1038 /* maybe check this against wait_for_proxy_id_to_expire? */
1039 static void no_response_to_proxied_request(void *ctx)
1040 {
1041         REQUEST *request = ctx;
1042         home_server *home;
1043         char buffer[128];
1044
1045         rad_assert(request->magic == REQUEST_MAGIC);
1046
1047         if (request->master_state == REQUEST_STOP_PROCESSING) {
1048                 ev_request_free(&request);
1049                 return;
1050         }
1051
1052         rad_assert(request->child_state == REQUEST_PROXIED);
1053
1054         /*
1055          *      If we've failed over to an internal home server,
1056          *      replace the callback with the correct one.  This
1057          *      is due to locking issues with child threads...
1058          */
1059         if (request->home_server->server) {
1060                 wait_a_bit(request);
1061                 return;
1062         }
1063
1064 #ifdef WITH_TCP
1065         if (request->home_server->proto != IPPROTO_TCP)
1066 #endif
1067                 check_for_zombie_home_server(request);
1068
1069         home = request->home_server;
1070
1071         /*
1072          *      The default as of 2.1.7 is to allow requests to
1073          *      fail-over to a backup home server when this one does
1074          *      not respond.  The old behavior can be configured as
1075          *      well.
1076          */
1077         if (home->no_response_fail) {
1078                 radlog(L_ERR, "Rejecting request %d (proxy Id %d) due to lack of any response from home server %s port %d",
1079                        request->number, request->proxy->id,
1080                        inet_ntop(request->proxy->dst_ipaddr.af,
1081                                  &request->proxy->dst_ipaddr.ipaddr,
1082                                  buffer, sizeof(buffer)),
1083                        request->proxy->dst_port);
1084
1085                 post_proxy_fail_handler(request);
1086         } else {
1087                 /*
1088                  *      Ensure that there is a callback for the request.
1089                  */
1090                 request->child_state = REQUEST_RUNNING;
1091                 wait_a_bit(request);
1092         }
1093
1094         /*
1095          *      Don't touch request due to race conditions
1096          */
1097
1098 #ifdef WITH_TCP
1099         /*
1100          *      Do nothing more.  The home server didn't respond,
1101          *      but that isn't a catastrophic failure.  Some home
1102          *      servers don't respond to packets...
1103          */
1104         if (home->proto == IPPROTO_TCP) {
1105                 /*
1106                  *      FIXME: Set up TCP pinging on this connection.
1107                  *
1108                  *      Maybe the CONNECTION is dead, but the home
1109                  *      server is alive.  In that case, we need to start
1110                  *      pinging on the connection.
1111                  *
1112                  *      This means doing the pinging BEFORE the
1113                  *      post_proxy_fail_handler above, as it may do
1114                  *      something with the request, and cause the
1115                  *      proxy listener to go away!
1116                  */
1117                 return;
1118         }
1119 #endif
1120
1121         if (home->state == HOME_STATE_IS_DEAD) {
1122                 rad_assert(home->ev != NULL); /* or it will never wake up */
1123                 return;
1124         }
1125
1126         /*
1127          *      Enable the zombie period when we notice that the home
1128          *      server hasn't responded.  We do NOT back-date the start
1129          *      of the zombie period.
1130          */
1131         if (home->state == HOME_STATE_ALIVE) {
1132                 home->state = HOME_STATE_ZOMBIE;
1133                 home->zombie_period_start = now;
1134
1135                 radlog(L_INFO, "PROXY: Marking home server %s port %d as zombie (it looks like it is dead).",
1136                        inet_ntop(home->ipaddr.af, &home->ipaddr.ipaddr,
1137                                  buffer, sizeof(buffer)),
1138                        home->port);
1139
1140                 /*
1141                  *      Start pinging the home server.
1142                  */
1143                 ping_home_server(home);
1144         }
1145 }
1146 #endif
1147
1148 static void wait_a_bit(void *ctx)
1149 {
1150         struct timeval when;
1151         REQUEST *request = ctx;
1152         fr_event_callback_t callback = NULL;
1153
1154         rad_assert(request->magic == REQUEST_MAGIC);
1155
1156         /*
1157          *      The socket was closed.  Tell the request that
1158          *      there is no point in continuing.
1159          */
1160         if (request->listener->status != RAD_LISTEN_STATUS_KNOWN) {
1161                 goto stop_processing;
1162         }
1163
1164 #ifdef WITH_COA
1165         /*
1166          *      The CoA request is a new (internally generated)
1167          *      request, created in a child thread.  We therefore need
1168          *      some way to tie its events back into the main event
1169          *      handler.
1170          */
1171         if (request->coa && !request->coa->proxy_reply &&
1172             request->coa->next_callback) {
1173                 request->coa->when = request->coa->next_when;
1174                 INSERT_EVENT(request->coa->next_callback, request->coa);
1175                 request->coa->next_callback = NULL;
1176                 request->coa->parent = NULL;
1177                 request->coa = NULL;
1178         }
1179 #endif
1180
1181         switch (request->child_state) {
1182         case REQUEST_QUEUED:
1183         case REQUEST_RUNNING:
1184                 when = request->received;
1185                 when.tv_sec += request->root->max_request_time;
1186
1187                 /*
1188                  *      Normally called from the event loop with the
1189                  *      proper event loop time.  Otherwise, called from
1190                  *      post proxy fail handler, which sets "now", and
1191                  *      this call won't re-set it, because we're not
1192                  *      in the event loop.
1193                  */
1194                 fr_event_now(el, &now);
1195
1196                 /*
1197                  *      Request still has more time.  Continue
1198                  *      waiting.
1199                  */
1200                 if (timercmp(&now, &when, <) ||
1201                     ((request->listener->type == RAD_LISTEN_DETAIL) &&
1202                      (request->child_state == REQUEST_QUEUED))) {
1203                         if (request->delay < (USEC / 10)) {
1204                                 request->delay = USEC / 10;
1205                         }
1206                         request->delay += request->delay >> 1;
1207
1208 #ifdef WITH_DETAIL
1209                         /*
1210                          *      Cap wait at some sane value for detail
1211                          *      files.
1212                          */
1213                         if ((request->listener->type == RAD_LISTEN_DETAIL) &&
1214                             (request->delay > (request->root->max_request_time * USEC))) {
1215                                 request->delay = request->root->max_request_time * USEC;
1216                         }
1217 #endif
1218
1219                         request->when = now;
1220                         tv_add(&request->when, request->delay);
1221                         callback = wait_a_bit;
1222                         break;
1223                 }
1224
1225 #if defined(HAVE_PTHREAD_H) || defined(WITH_PROXY)
1226                 /*
1227                  *      A child thread MAY still be running on the
1228                  *      request.  Ask the thread to stop working on
1229                  *      the request.
1230                  */
1231                 if (have_children) {
1232                         /* FIXME: kill unresponsive children? */
1233
1234                         /*
1235                          *      Print this error message ONLY if
1236                          *      there's a child currently processing
1237                          *      the request.  As we don't have thread
1238                          *      locks here, there may be race
1239                          *      conditions on this check.  But it's
1240                          *      just an error message, so that's OK.
1241                          */
1242                         if (!pthread_equal(request->child_pid, NO_SUCH_CHILD_PID)) {
1243                                 radlog(L_ERR, "WARNING: Unresponsive child for request %d, in module %s component %s",
1244                                        request->number,
1245                                        request->module ? request->module : "<server core>",
1246                                        request->component ? request->component : "<server core>");
1247                         }
1248
1249                 stop_processing:
1250                         request->master_state = REQUEST_STOP_PROCESSING;
1251
1252                         request->delay = USEC / 4;
1253                         tv_add(&request->when, request->delay);
1254                         callback = wait_for_child_to_die;
1255                         break;
1256                 }
1257 #else  /* no child threads */
1258         stop_processing:
1259 #endif
1260
1261                 /*
1262                  *      Else there are no child threads.  We probably
1263                  *      should have just marked the request as 'done'
1264                  *      elsewhere, like in the post-proxy-fail
1265                  *      handler.  But doing that would involve
1266                  *      checking for max_request_time in multiple
1267                  *      places, so this may be simplest.
1268                  */
1269                 request->child_state = REQUEST_DONE;
1270                 /* FALL-THROUGH */
1271
1272                 /*
1273                  *      Mark the request as no longer running,
1274                  *      and clean it up.
1275                  */
1276         case REQUEST_DONE:
1277 #ifdef HAVE_PTHREAD_H
1278                 request->child_pid = NO_SUCH_CHILD_PID;
1279 #endif
1280
1281 #ifdef WTH_COA
1282                 /*
1283                  *      This is a CoA request.  It's been divorced
1284                  *      from everything else, so we clean it up now.
1285                  */
1286                 if (!request->in_request_hash &&
1287                     request->proxy &&
1288                     (request->packet->code != request->proxy->code) &&
1289                     ((request->proxy->code == PW_COA_REQUEST) ||
1290                      (request->proxy->code == PW_DISCONNECT_REQUEST))) {
1291                         /*
1292                          *      FIXME: Do CoA MIBs
1293                          */
1294                         ev_request_free(&request);
1295                         return;
1296                 }
1297 #endif
1298                 request_stats_final(request);
1299                 cleanup_delay(request);
1300                 return;
1301
1302         case REQUEST_REJECT_DELAY:
1303         case REQUEST_CLEANUP_DELAY:
1304 #ifdef HAVE_PTHREAD_H
1305                 request->child_pid = NO_SUCH_CHILD_PID;
1306 #endif
1307                 request_stats_final(request);
1308
1309         case REQUEST_PROXIED:
1310                 rad_assert(request->next_callback != NULL);
1311                 rad_assert(request->next_callback != wait_a_bit);
1312
1313                 request->when = request->next_when;
1314                 callback = request->next_callback;
1315                 request->next_callback = NULL;
1316                 break;
1317
1318         default:
1319                 rad_panic("Internal sanity check failure");
1320                 return;
1321         }
1322
1323         /*
1324          *      Something major went wrong.  Discard the request, and
1325          *      keep running.
1326          *
1327          *      FIXME: No idea why this happens or how to fix it...
1328          *      It seems to happen *only* when requests are proxied,
1329          *      and where the home server doesn't respond.  So it looks
1330          *      like a race condition above, but it happens in debug
1331          *      mode, with no threads...
1332          */
1333         if (!callback) {
1334                 RDEBUG("WARNING: Internal sanity check failed in event handler for request %d: Discarding the request!", request->number);
1335                 ev_request_free(&request);
1336                 return;
1337         }
1338
1339         INSERT_EVENT(callback, request);
1340 }
1341
1342 #ifdef WITH_COA
1343 static void no_response_to_coa_request(void *ctx)
1344 {
1345         REQUEST *request = ctx;
1346         char buffer[128];
1347
1348         rad_assert(request->magic == REQUEST_MAGIC);
1349         rad_assert(request->child_state == REQUEST_PROXIED);
1350         rad_assert(request->home_server != NULL);
1351         rad_assert(!request->in_request_hash);
1352
1353         radlog(L_ERR, "No response to CoA request sent to %s",
1354                inet_ntop(request->proxy->dst_ipaddr.af,
1355                          &request->proxy->dst_ipaddr.ipaddr,
1356                          buffer, sizeof(buffer)));
1357
1358         /*
1359          *      Hack.
1360          */
1361         request->packet->code |= (PW_COA_REQUEST << 8);
1362         post_proxy_fail_handler(request);
1363 }
1364
1365
1366 static int update_event_timestamp(RADIUS_PACKET *packet, time_t when)
1367 {
1368         VALUE_PAIR *vp;
1369
1370         vp = pairfind(packet->vps, PW_EVENT_TIMESTAMP);
1371         if (!vp) return 0;
1372
1373         vp->vp_date = when;
1374
1375         if (packet->data) {
1376                 free(packet->data);
1377                 packet->data = NULL;
1378                 packet->data_len = 0;
1379         }
1380
1381         return 1;               /* time stamp updated */
1382 }
1383
1384
1385 /*
1386  *      Called when we haven't received a response to a CoA request.
1387  */
1388 static void retransmit_coa_request(void *ctx)
1389 {
1390         int delay, frac;
1391         struct timeval mrd;
1392         REQUEST *request = ctx;
1393
1394         rad_assert(request->magic == REQUEST_MAGIC);
1395         rad_assert(request->child_state == REQUEST_PROXIED);
1396         rad_assert(request->home_server != NULL);
1397         rad_assert(!request->in_request_hash);
1398         rad_assert(request->parent == NULL);
1399
1400         fr_event_now(el, &now);
1401
1402         /*
1403          *      Cap count at MRC, if it is non-zero.
1404          */
1405         if (request->home_server->coa_mrc &&
1406             (request->num_coa_requests >= request->home_server->coa_mrc)) {
1407                 no_response_to_coa_request(request);
1408                 return;
1409         }
1410
1411         /*
1412          *      RFC 5080 Section 2.2.1
1413          *
1414          *      RT = 2*RTprev + RAND*RTprev
1415          *         = 1.9 * RTprev + rand(0,.2) * RTprev
1416          *         = 1.9 * RTprev + rand(0,1) * (RTprev / 5)
1417          */
1418         delay = fr_rand();
1419         delay ^= (delay >> 16);
1420         delay &= 0xffff;
1421         frac = request->delay / 5;
1422         delay = ((frac >> 16) * delay) + (((frac & 0xffff) * delay) >> 16);
1423
1424         delay += (2 * request->delay) - (request->delay / 10);
1425
1426         /*
1427          *      Cap delay at MRT, if MRT is non-zero.
1428          */
1429         if (request->home_server->coa_mrt &&
1430             (delay > (request->home_server->coa_mrt * USEC))) {
1431                 int mrt_usec = request->home_server->coa_mrt * USEC;
1432
1433                 /*
1434                  *      delay = MRT + RAND * MRT
1435                  *            = 0.9 MRT + rand(0,.2)  * MRT
1436                  */
1437                 delay = fr_rand();
1438                 delay ^= (delay >> 15);
1439                 delay &= 0x1ffff;
1440                 delay = ((mrt_usec >> 16) * delay) + (((mrt_usec & 0xffff) * delay) >> 16);
1441                 delay += mrt_usec - (mrt_usec / 10);
1442         }
1443
1444         request->delay = delay;
1445         request->when = now;
1446         tv_add(&request->when, request->delay);
1447         mrd = request->proxy_when;
1448         mrd.tv_sec += request->home_server->coa_mrd;
1449
1450         /*
1451          *      Cap duration at MRD.
1452          */
1453         if (timercmp(&mrd, &request->when, <)) {
1454                 request->when = mrd;
1455                 INSERT_EVENT(no_response_to_coa_request, request);
1456
1457         } else {
1458                 INSERT_EVENT(retransmit_coa_request, request);
1459         }
1460
1461         if (update_event_timestamp(request->proxy, now.tv_sec)) {
1462                 /*
1463                  *      Keep a copy of the old Id so that the
1464                  *      re-transmitted request doesn't re-use the old
1465                  *      Id.
1466                  */
1467                 RADIUS_PACKET old = *request->proxy;
1468
1469                 /*
1470                  *      Don't free the old Id on error.
1471                  */
1472                 if (!insert_into_proxy_hash(request)) {
1473                         radlog(L_PROXY,"Failed re-inserting CoA request into proxy hash.");
1474                         return;
1475                 }
1476
1477                 /*
1478                  *      Now that we have a new Id, free the old one.
1479                  */
1480                 PTHREAD_MUTEX_LOCK(&proxy_mutex);
1481                 fr_packet_list_yank(proxy_list, &old);
1482                 fr_packet_list_id_free(proxy_list, &old);
1483                 PTHREAD_MUTEX_UNLOCK(&proxy_mutex);
1484
1485                 request->num_proxied_requests = 0;
1486                 request->num_proxied_responses = 0;
1487         }
1488
1489         request->num_proxied_requests++;
1490         request->num_coa_requests++; /* is NOT reset by code 3 lines above! */
1491
1492         request->proxy_listener->send(request->proxy_listener,
1493                                       request);
1494 }
1495
1496
1497 /*
1498  *      The original request is either DONE, or in CLEANUP_DELAY.
1499  */
1500 static int originated_coa_request(REQUEST *request)
1501 {
1502         int delay, rcode, pre_proxy_type = 0;
1503         VALUE_PAIR *vp;
1504         REQUEST *coa;
1505         fr_ipaddr_t ipaddr;
1506         char buffer[256];
1507
1508         rad_assert(request->proxy == NULL);
1509         rad_assert(!request->in_proxy_hash);
1510         rad_assert(request->proxy_reply == NULL);
1511
1512         vp = pairfind(request->config_items, PW_SEND_COA_REQUEST);
1513         if (!vp && request->coa) vp = pairfind(request->coa->proxy->vps, PW_SEND_COA_REQUEST);
1514         if (vp) {
1515                 if (vp->vp_integer == 0) {
1516                         ev_request_free(&request->coa);
1517                         return 1;       /* success */
1518                 }
1519
1520                 if (!request->coa) request_alloc_coa(request);
1521                 if (!request->coa) return 0;
1522         }
1523
1524         coa = request->coa;
1525
1526         /*
1527          *      src_ipaddr will be set up in proxy_encode.
1528          */
1529         memset(&ipaddr, 0, sizeof(ipaddr));
1530         vp = pairfind(coa->proxy->vps, PW_PACKET_DST_IP_ADDRESS);
1531         if (vp) {
1532                 ipaddr.af = AF_INET;
1533                 ipaddr.ipaddr.ip4addr.s_addr = vp->vp_ipaddr;
1534
1535         } else if ((vp = pairfind(coa->proxy->vps,
1536                                   PW_PACKET_DST_IPV6_ADDRESS)) != NULL) {
1537                 ipaddr.af = AF_INET6;
1538                 ipaddr.ipaddr.ip6addr = vp->vp_ipv6addr;
1539
1540         } else if ((vp = pairfind(coa->proxy->vps,
1541                                   PW_HOME_SERVER_POOL)) != NULL) {
1542                 coa->home_pool = home_pool_byname(vp->vp_strvalue,
1543                                                   HOME_TYPE_COA);
1544                 if (!coa->home_pool) {
1545                         RDEBUG2("WARNING: No such home_server_pool %s",
1546                                vp->vp_strvalue);
1547         fail:
1548                         ev_request_free(&request->coa);
1549                         return 0;
1550                 }
1551
1552                 /*
1553                  *      Prefer
1554                  */
1555         } else if (request->client->coa_pool) {
1556                 coa->home_pool = request->client->coa_pool;
1557
1558         } else if (request->client->coa_server) {
1559                 coa->home_server = request->client->coa_server;
1560
1561         } else {
1562                 /*
1563                  *      If all else fails, send it to the client that
1564                  *      originated this request.
1565                  */
1566                 memcpy(&ipaddr, &request->packet->src_ipaddr, sizeof(ipaddr));
1567         }
1568
1569         /*
1570          *      Use the pool, if it exists.
1571          */
1572         if (coa->home_pool) {
1573                 coa->home_server = home_server_ldb(NULL, coa->home_pool, coa);
1574                 if (!coa->home_server) {
1575                         RDEBUG("WARNING: No live home server for home_server_pool %s", vp->vp_strvalue);
1576                         goto fail;
1577                 }
1578
1579         } else if (!coa->home_server) {
1580                 int port = PW_COA_UDP_PORT;
1581
1582                 vp = pairfind(coa->proxy->vps, PW_PACKET_DST_PORT);
1583                 if (vp) port = vp->vp_integer;
1584
1585                 coa->home_server = home_server_find(&ipaddr, port);
1586                 if (!coa->home_server) {
1587                         RDEBUG2("WARNING: Unknown destination %s:%d for CoA request.",
1588                                inet_ntop(ipaddr.af, &ipaddr.ipaddr,
1589                                          buffer, sizeof(buffer)), port);
1590                         goto fail;
1591                 }
1592         }
1593
1594         vp = pairfind(coa->proxy->vps, PW_PACKET_TYPE);
1595         if (vp) {
1596                 switch (vp->vp_integer) {
1597                 case PW_COA_REQUEST:
1598                 case PW_DISCONNECT_REQUEST:
1599                         coa->proxy->code = vp->vp_integer;
1600                         break;
1601
1602                 default:
1603                         DEBUG("Cannot set CoA Packet-Type to code %d",
1604                               vp->vp_integer);
1605                         goto fail;
1606                 }
1607         }
1608
1609         if (!coa->proxy->code) coa->proxy->code = PW_COA_REQUEST;
1610
1611         /*
1612          *      The rest of the server code assumes that
1613          *      request->packet && request->reply exist.  Copy them
1614          *      from the original request.
1615          */
1616         rad_assert(coa->packet != NULL);
1617         rad_assert(coa->packet->vps == NULL);
1618         memcpy(coa->packet, request->packet, sizeof(*request->packet));
1619         coa->packet->vps = paircopy(request->packet->vps);
1620         coa->packet->data = NULL;
1621         rad_assert(coa->reply != NULL);
1622         rad_assert(coa->reply->vps == NULL);
1623         memcpy(coa->reply, request->reply, sizeof(*request->reply));
1624         coa->reply->vps = paircopy(request->reply->vps);
1625         coa->reply->data = NULL;
1626         coa->config_items = paircopy(request->config_items);
1627
1628         /*
1629          *      Call the pre-proxy routines.
1630          */
1631         vp = pairfind(request->config_items, PW_PRE_PROXY_TYPE);
1632         if (vp) {
1633                 RDEBUG2("  Found Pre-Proxy-Type %s", vp->vp_strvalue);
1634                 pre_proxy_type = vp->vp_integer;
1635         }
1636
1637         if (coa->home_pool && coa->home_pool->virtual_server) {
1638                 const char *old_server = coa->server;
1639
1640                 coa->server = coa->home_pool->virtual_server;
1641                 RDEBUG2(" server %s {", coa->server);
1642                 rcode = module_pre_proxy(pre_proxy_type, coa);
1643                 RDEBUG2(" }");
1644                 coa->server = old_server;
1645         } else {
1646                 rcode = module_pre_proxy(pre_proxy_type, coa);
1647         }
1648         switch (rcode) {
1649         default:
1650                 goto fail;
1651
1652         /*
1653          *      Only send the CoA packet if the pre-proxy code succeeded.
1654          */
1655         case RLM_MODULE_NOOP:
1656         case RLM_MODULE_OK:
1657         case RLM_MODULE_UPDATED:
1658                 break;
1659         }
1660
1661         /*
1662          *      Source IP / port is set when the proxy socket
1663          *      is chosen.
1664          */
1665         coa->proxy->dst_ipaddr = coa->home_server->ipaddr;
1666         coa->proxy->dst_port = coa->home_server->port;
1667
1668         if (!insert_into_proxy_hash(coa)) {
1669                 radlog(L_PROXY, "Failed inserting CoA request into proxy hash.");
1670                 goto fail;
1671         }
1672
1673         /*
1674          *      We CANNOT divorce the CoA request from the parent
1675          *      request.  This function is running in a child thread,
1676          *      and we need access to the main event loop in order to
1677          *      to add the timers for the CoA packet.  See
1678          *      wait_a_bit().
1679          */
1680
1681         /*
1682          *      Forget about the original request completely at this
1683          *      point.
1684          */
1685         request = coa;
1686
1687         gettimeofday(&request->proxy_when, NULL);
1688         request->received = request->next_when = request->proxy_when;
1689         rad_assert(request->proxy_reply == NULL);
1690
1691         /*
1692          *      Implement re-transmit algorithm as per RFC 5080
1693          *      Section 2.2.1.
1694          *
1695          *      We want IRT + RAND*IRT
1696          *      or 0.9 IRT + rand(0,.2) IRT
1697          *
1698          *      2^20 ~ USEC, and we want 2.
1699          *      rand(0,0.2) USEC ~ (rand(0,2^21) / 10)
1700          */
1701         delay = (fr_rand() & ((1 << 22) - 1)) / 10;
1702         request->delay = delay * request->home_server->coa_irt;
1703         delay = request->home_server->coa_irt * USEC;
1704         delay -= delay / 10;
1705         delay += request->delay;
1706
1707         request->delay = delay;
1708         tv_add(&request->next_when, delay);
1709         request->next_callback = retransmit_coa_request;
1710
1711         /*
1712          *      Note that we set proxied BEFORE sending the packet.
1713          *
1714          *      Once we send it, the request is tainted, as
1715          *      another thread may have picked it up.  Don't
1716          *      touch it!
1717          */
1718         request->num_proxied_requests = 1;
1719         request->num_proxied_responses = 0;
1720         request->child_pid = NO_SUCH_CHILD_PID;
1721
1722         update_event_timestamp(request->proxy, request->proxy_when.tv_sec);
1723
1724         request->child_state = REQUEST_PROXIED;
1725
1726         DEBUG_PACKET(request, request->proxy, 1);
1727
1728         request->proxy_listener->send(request->proxy_listener,
1729                                       request);
1730         return 1;
1731 }
1732 #endif  /* WITH_COA */
1733
1734 #ifdef WITH_PROXY
1735 static int process_proxy_reply(REQUEST *request)
1736 {
1737         int rcode;
1738         int post_proxy_type = 0;
1739         VALUE_PAIR *vp;
1740
1741         /*
1742          *      Delete any reply we had accumulated until now.
1743          */
1744         pairfree(&request->reply->vps);
1745
1746         /*
1747          *      Run the packet through the post-proxy stage,
1748          *      BEFORE playing games with the attributes.
1749          */
1750         vp = pairfind(request->config_items, PW_POST_PROXY_TYPE);
1751         if (vp) {
1752                 RDEBUG2("  Found Post-Proxy-Type %s", vp->vp_strvalue);
1753                 post_proxy_type = vp->vp_integer;
1754         }
1755
1756         if (request->home_pool && request->home_pool->virtual_server) {
1757                 const char *old_server = request->server;
1758
1759                 request->server = request->home_pool->virtual_server;
1760                 RDEBUG2(" server %s {", request->server);
1761                 rcode = module_post_proxy(post_proxy_type, request);
1762                 RDEBUG2(" }");
1763                 request->server = old_server;
1764         } else {
1765                 rcode = module_post_proxy(post_proxy_type, request);
1766         }
1767
1768 #ifdef WITH_COA
1769         if (request->packet->code == request->proxy->code)
1770           /*
1771            *    Don't run the next bit if we originated a CoA
1772            *    packet, after receiving an Access-Request or
1773            *    Accounting-Request.
1774            */
1775 #endif
1776
1777         /*
1778          *      There may NOT be a proxy reply, as we may be
1779          *      running Post-Proxy-Type = Fail.
1780          */
1781         if (request->proxy_reply) {
1782                 /*
1783                  *      Delete the Proxy-State Attributes from
1784                  *      the reply.  These include Proxy-State
1785                  *      attributes from us and remote server.
1786                  */
1787                 pairdelete(&request->proxy_reply->vps, PW_PROXY_STATE);
1788
1789                 /*
1790                  *      Add the attributes left in the proxy
1791                  *      reply to the reply list.
1792                  */
1793                 pairadd(&request->reply->vps, request->proxy_reply->vps);
1794                 request->proxy_reply->vps = NULL;
1795
1796                 /*
1797                  *      Free proxy request pairs.
1798                  */
1799                 pairfree(&request->proxy->vps);
1800         }
1801
1802         switch (rcode) {
1803         default:  /* Don't do anything */
1804                 break;
1805         case RLM_MODULE_FAIL:
1806                 /* FIXME: debug print stuff */
1807                 request->child_state = REQUEST_DONE;
1808                 return 0;
1809
1810         case RLM_MODULE_HANDLED:
1811                 /* FIXME: debug print stuff */
1812                 request->child_state = REQUEST_DONE;
1813                 return 0;
1814         }
1815
1816         return 1;
1817 }
1818 #endif
1819
1820 static int request_pre_handler(REQUEST *request)
1821 {
1822         int rcode;
1823
1824         rad_assert(request->magic == REQUEST_MAGIC);
1825         rad_assert(request->packet != NULL);
1826
1827         request->child_state = REQUEST_RUNNING;
1828
1829         /*
1830          *      Don't decode the packet if it's an internal "fake"
1831          *      request.  Instead, just return so that the caller can
1832          *      process it.
1833          */
1834         if (request->packet->dst_port == 0) {
1835                 request->username = pairfind(request->packet->vps,
1836                                              PW_USER_NAME);
1837                 request->password = pairfind(request->packet->vps,
1838                                              PW_USER_PASSWORD);
1839                 return 1;
1840         }
1841
1842 #ifdef WITH_PROXY
1843         /*
1844          *      Put the decoded packet into it's proper place.
1845          */
1846         if (request->proxy_reply != NULL) {
1847                 /*
1848                  *      FIXME: For now, we can only proxy RADIUS packets.
1849                  *
1850                  *      In order to proxy other packets, we need to
1851                  *      somehow cache the "decode" function.
1852                  */
1853                 rcode = rad_decode(request->proxy_reply, request->proxy,
1854                                    request->home_server->secret);
1855                 DEBUG_PACKET(request, request->proxy_reply, 0);
1856         } else
1857 #endif
1858         if (request->packet->vps == NULL) {
1859                 rcode = request->listener->decode(request->listener, request);
1860
1861                 if (debug_condition) {
1862                         int result = FALSE;
1863                         const char *my_debug = debug_condition;
1864
1865                         /*
1866                          *      Ignore parse errors.
1867                          */
1868                         radius_evaluate_condition(request, RLM_MODULE_OK, 0,
1869                                                   &my_debug, 1,
1870                                                   &result);
1871                         if (result) {
1872                                 request->options = 2;
1873                                 request->radlog = radlog_request;
1874                         }
1875                 }
1876
1877                 DEBUG_PACKET(request, request->packet, 0);
1878         } else {
1879                 rcode = 0;
1880         }
1881
1882         if (rcode < 0) {
1883                 radlog(L_ERR, "%s Dropping packet without response.", fr_strerror());
1884                 request->child_state = REQUEST_DONE;
1885                 return 0;
1886         }
1887
1888         if (!request->username) {
1889                 request->username = pairfind(request->packet->vps,
1890                                              PW_USER_NAME);
1891         }
1892
1893 #ifdef WITH_PROXY
1894         if (request->proxy) {
1895                 return process_proxy_reply(request);
1896 #endif
1897         }
1898
1899         return 1;
1900 }
1901
1902
1903 #ifdef WITH_PROXY
1904 /*
1905  *      Do state handling when we proxy a request.
1906  */
1907 static int proxy_request(REQUEST *request)
1908 {
1909         struct timeval when;
1910         char buffer[128];
1911
1912         if (request->home_server->server) {
1913                 RDEBUG("ERROR: Cannot perform real proxying to a virtual server.");
1914                 return 0;
1915         }
1916
1917         if (!insert_into_proxy_hash(request)) {
1918                 radlog(L_PROXY, "Failed inserting request into proxy hash.");
1919                 return 0;
1920         }
1921
1922         request->proxy_listener->encode(request->proxy_listener, request);
1923
1924         when = request->received;
1925         when.tv_sec += request->root->max_request_time;
1926
1927         gettimeofday(&request->proxy_when, NULL);
1928
1929         request->next_when = request->proxy_when;
1930         request->next_when.tv_sec += request->home_server->response_window;
1931
1932         rad_assert(request->home_server->response_window > 0);
1933
1934         if (timercmp(&when, &request->next_when, <)) {
1935                 request->next_when = when;
1936         }
1937         request->next_callback = no_response_to_proxied_request;
1938
1939         RDEBUG2("Proxying request %d to home server %s port %d",
1940                request->number,
1941                inet_ntop(request->proxy->dst_ipaddr.af,
1942                          &request->proxy->dst_ipaddr.ipaddr,
1943                          buffer, sizeof(buffer)),
1944                 request->proxy->dst_port);
1945
1946         /*
1947          *      Note that we set proxied BEFORE sending the packet.
1948          *
1949          *      Once we send it, the request is tainted, as
1950          *      another thread may have picked it up.  Don't
1951          *      touch it!
1952          */
1953         request->num_proxied_requests = 1;
1954         request->num_proxied_responses = 0;
1955 #ifdef HAVE_PTHREAD_H
1956         request->child_pid = NO_SUCH_CHILD_PID;
1957 #endif
1958         request->child_state = REQUEST_PROXIED;
1959
1960         DEBUG_PACKET(request, request->proxy, 1);
1961
1962         request->proxy_listener->send(request->proxy_listener,
1963                                       request);
1964         return 1;
1965 }
1966
1967
1968 /*
1969  *      "Proxy" the request by sending it to a new virtual server.
1970  */
1971 static int proxy_to_virtual_server(REQUEST *request)
1972 {
1973         REQUEST *fake;
1974
1975         if (!request->home_server || !request->home_server->server) return 0;
1976
1977         if (request->parent) {
1978                 RDEBUG2("WARNING: Cancelling proxy request to virtual server %s as this request was itself proxied.", request->home_server->server);
1979                 return 0;
1980         }
1981
1982         fake = request_alloc_fake(request);
1983         if (!fake) {
1984                 RDEBUG2("WARNING: Out of memory");
1985                 return 0;
1986         }
1987
1988         fake->packet->vps = paircopy(request->proxy->vps);
1989         fake->server = request->home_server->server;
1990
1991         if ((request->proxy->code != PW_AUTHENTICATION_REQUEST)
1992 #ifdef WITH_ACCOUNTING
1993             && (request->proxy->code == PW_ACCOUNTING_REQUEST)
1994 #endif
1995                 ) {
1996                 RDEBUG2("Unknown packet type %d", request->proxy->code);
1997                 ev_request_free(&fake);
1998                 return 0;
1999         }
2000
2001         rad_assert(request->process != NULL);
2002
2003         RDEBUG2(">>> Sending proxied request internally to virtual server.");
2004         radius_handle_request(fake, fake->process);
2005         RDEBUG2("<<< Received proxied response code %d from internal virtual server.", fake->reply->code);
2006
2007         if (fake->reply->code != 0) {
2008                 request->proxy_reply = fake->reply;
2009                 fake->reply = NULL;
2010         } else {
2011                 /*
2012                  *      There was no response
2013                  */
2014                 setup_post_proxy_fail(request);
2015         }
2016
2017         ev_request_free(&fake);
2018
2019         process_proxy_reply(request);
2020
2021         /*
2022          *      Process it through the normal section again, but ONLY
2023          *      if we received a proxy reply..
2024          */
2025         if (request->proxy_reply) {
2026                 if (request->server) RDEBUG("server %s {",
2027                                             request->server != NULL ?
2028                                             request->server : "");
2029                 request->process(request);
2030
2031                 if (request->server) RDEBUG("} # server %s",
2032                                             request->server != NULL ?
2033                                             request->server : "");
2034         }
2035
2036         return 2;               /* success, but NOT '1' !*/
2037 }
2038
2039 /*
2040  *      Return 1 if we did proxy it, or the proxy attempt failed
2041  *      completely.  Either way, the caller doesn't touch the request
2042  *      any more if we return 1.
2043  */
2044 static int successfully_proxied_request(REQUEST *request)
2045 {
2046         int rcode;
2047         int pre_proxy_type = 0;
2048         VALUE_PAIR *realmpair;
2049         VALUE_PAIR *strippedname;
2050         VALUE_PAIR *vp;
2051         char *realmname = NULL;
2052         home_server *home;
2053         REALM *realm = NULL;
2054         home_pool_t *pool;
2055
2056         /*
2057          *      If it was already proxied, do nothing.
2058          *
2059          *      FIXME: This should really be a serious error.
2060          */
2061         if (request->in_proxy_hash ||
2062             (request->proxy_reply && (request->proxy_reply->code != 0))) {
2063                 return 0;
2064         }
2065
2066         realmpair = pairfind(request->config_items, PW_PROXY_TO_REALM);
2067         if (!realmpair || (realmpair->length == 0)) {
2068                 int pool_type;
2069
2070                 vp = pairfind(request->config_items, PW_HOME_SERVER_POOL);
2071                 if (!vp) return 0;
2072
2073                 switch (request->packet->code) {
2074                 case PW_AUTHENTICATION_REQUEST:
2075                         pool_type = HOME_TYPE_AUTH;
2076                         break;
2077
2078 #ifdef WITH_ACCOUNTING
2079                 case PW_ACCOUNTING_REQUEST:
2080                         pool_type = HOME_TYPE_ACCT;
2081                         break;
2082 #endif
2083
2084 #ifdef WITH_COA
2085                 case PW_COA_REQUEST:
2086                 case PW_DISCONNECT_REQUEST:
2087                         pool_type = HOME_TYPE_COA;
2088                         break;
2089 #endif
2090
2091                 default:
2092                         return 0;
2093                 }
2094
2095                 pool = home_pool_byname(vp->vp_strvalue, pool_type);
2096                 if (!pool) {
2097                         RDEBUG2("ERROR: Cannot proxy to unknown pool %s",
2098                                 vp->vp_strvalue);
2099                         return 0;
2100                 }
2101
2102                 realmname = NULL; /* no realms */
2103                 realm = NULL;
2104                 goto found_pool;
2105         }
2106
2107         realmname = (char *) realmpair->vp_strvalue;
2108
2109         realm = realm_find2(realmname);
2110         if (!realm) {
2111                 RDEBUG2("ERROR: Cannot proxy to unknown realm %s", realmname);
2112                 return 0;
2113         }
2114
2115         /*
2116          *      Figure out which pool to use.
2117          */
2118         if (request->packet->code == PW_AUTHENTICATION_REQUEST) {
2119                 pool = realm->auth_pool;
2120
2121 #ifdef WITH_ACCOUNTING
2122         } else if (request->packet->code == PW_ACCOUNTING_REQUEST) {
2123                 pool = realm->acct_pool;
2124 #endif
2125
2126 #ifdef WITH_COA
2127         } else if ((request->packet->code == PW_COA_REQUEST) ||
2128                    (request->packet->code == PW_DISCONNECT_REQUEST)) {
2129                 pool = realm->acct_pool;
2130 #endif
2131
2132         } else {
2133                 rad_panic("Internal sanity check failed");
2134         }
2135
2136         if (!pool) {
2137                 RDEBUG2(" WARNING: Cancelling proxy to Realm %s, as the realm is local.",
2138                        realmname);
2139                 return 0;
2140         }
2141
2142 found_pool:
2143         home = home_server_ldb(realmname, pool, request);
2144         if (!home) {
2145                 RDEBUG2("ERROR: Failed to find live home server for realm %s",
2146                        realmname);
2147                 return -1;
2148         }
2149         request->home_pool = pool;
2150
2151 #ifdef WITH_COA
2152         /*
2153          *      Once we've decided to proxy a request, we cannot send
2154          *      a CoA packet.  So we free up any CoA packet here.
2155          */
2156         ev_request_free(&request->coa);
2157 #endif
2158         /*
2159          *      Remember that we sent the request to a Realm.
2160          */
2161         if (realmname) pairadd(&request->packet->vps,
2162                                pairmake("Realm", realmname, T_OP_EQ));
2163
2164         /*
2165          *      Strip the name, if told to.
2166          *
2167          *      Doing it here catches the case of proxied tunneled
2168          *      requests.
2169          */
2170         if (realm && (realm->striprealm == TRUE) &&
2171            (strippedname = pairfind(request->proxy->vps, PW_STRIPPED_USER_NAME)) != NULL) {
2172                 /*
2173                  *      If there's a Stripped-User-Name attribute in
2174                  *      the request, then use THAT as the User-Name
2175                  *      for the proxied request, instead of the
2176                  *      original name.
2177                  *
2178                  *      This is done by making a copy of the
2179                  *      Stripped-User-Name attribute, turning it into
2180                  *      a User-Name attribute, deleting the
2181                  *      Stripped-User-Name and User-Name attributes
2182                  *      from the vps list, and making the new
2183                  *      User-Name the head of the vps list.
2184                  */
2185                 vp = pairfind(request->proxy->vps, PW_USER_NAME);
2186                 if (!vp) {
2187                         vp = radius_paircreate(request, NULL,
2188                                                PW_USER_NAME, PW_TYPE_STRING);
2189                         rad_assert(vp != NULL); /* handled by above function */
2190                         /* Insert at the START of the list */
2191                         vp->next = request->proxy->vps;
2192                         request->proxy->vps = vp;
2193                 }
2194                 memcpy(vp->vp_strvalue, strippedname->vp_strvalue,
2195                        sizeof(vp->vp_strvalue));
2196                 vp->length = strippedname->length;
2197
2198                 /*
2199                  *      Do NOT delete Stripped-User-Name.
2200                  */
2201         }
2202
2203         /*
2204          *      If there is no PW_CHAP_CHALLENGE attribute but
2205          *      there is a PW_CHAP_PASSWORD we need to add it
2206          *      since we can't use the request authenticator
2207          *      anymore - we changed it.
2208          */
2209         if ((request->packet->code == PW_AUTHENTICATION_REQUEST) &&
2210             pairfind(request->proxy->vps, PW_CHAP_PASSWORD) &&
2211             pairfind(request->proxy->vps, PW_CHAP_CHALLENGE) == NULL) {
2212                 vp = radius_paircreate(request, &request->proxy->vps,
2213                                        PW_CHAP_CHALLENGE, PW_TYPE_OCTETS);
2214                 vp->length = AUTH_VECTOR_LEN;
2215                 memcpy(vp->vp_strvalue, request->packet->vector, AUTH_VECTOR_LEN);
2216         }
2217
2218         /*
2219          *      The RFC's say we have to do this, but FreeRADIUS
2220          *      doesn't need it.
2221          */
2222         vp = radius_paircreate(request, &request->proxy->vps,
2223                                PW_PROXY_STATE, PW_TYPE_OCTETS);
2224         snprintf(vp->vp_strvalue, sizeof(vp->vp_strvalue), "%d",
2225                  request->packet->id);
2226         vp->length = strlen(vp->vp_strvalue);
2227
2228         /*
2229          *      Should be done BEFORE inserting into proxy hash, as
2230          *      pre-proxy may use this information, or change it.
2231          */
2232         request->proxy->code = request->packet->code;
2233
2234         /*
2235          *      Call the pre-proxy routines.
2236          */
2237         vp = pairfind(request->config_items, PW_PRE_PROXY_TYPE);
2238         if (vp) {
2239                 RDEBUG2("  Found Pre-Proxy-Type %s", vp->vp_strvalue);
2240                 pre_proxy_type = vp->vp_integer;
2241         }
2242
2243         rad_assert(request->home_pool != NULL);
2244
2245         if (request->home_pool->virtual_server) {
2246                 const char *old_server = request->server;
2247
2248                 request->server = request->home_pool->virtual_server;
2249                 RDEBUG2(" server %s {", request->server);
2250                 rcode = module_pre_proxy(pre_proxy_type, request);
2251                 RDEBUG2(" }");
2252                         request->server = old_server;
2253         } else {
2254                 rcode = module_pre_proxy(pre_proxy_type, request);
2255         }
2256         switch (rcode) {
2257         case RLM_MODULE_FAIL:
2258         case RLM_MODULE_INVALID:
2259         case RLM_MODULE_NOTFOUND:
2260         case RLM_MODULE_USERLOCK:
2261         default:
2262                 /* FIXME: debug print failed stuff */
2263                 return -1;
2264
2265         case RLM_MODULE_REJECT:
2266         case RLM_MODULE_HANDLED:
2267                 return 0;
2268
2269         /*
2270          *      Only proxy the packet if the pre-proxy code succeeded.
2271          */
2272         case RLM_MODULE_NOOP:
2273         case RLM_MODULE_OK:
2274         case RLM_MODULE_UPDATED:
2275                 break;
2276         }
2277
2278         /*
2279          *      If it's a fake request, don't send the proxy
2280          *      packet.  The outer tunnel session will take
2281          *      care of doing that.
2282          */
2283         if (request->packet->dst_port == 0) {
2284                 request->home_server = NULL;
2285                 return 1;
2286         }
2287
2288         if (request->home_server->server) {
2289                 return proxy_to_virtual_server(request);
2290         }
2291
2292         if (!proxy_request(request)) {
2293                 RDEBUG("ERROR: Failed to proxy request %d", request->number);
2294                 return -1;
2295         }
2296
2297         return 1;
2298 }
2299 #endif
2300
2301 static void request_post_handler(REQUEST *request)
2302 {
2303         int child_state = -1;
2304         struct timeval when;
2305         VALUE_PAIR *vp;
2306
2307         if ((request->master_state == REQUEST_STOP_PROCESSING) ||
2308             (request->parent &&
2309              (request->parent->master_state == REQUEST_STOP_PROCESSING))) {
2310                 RDEBUG2("Request %d was cancelled.", request->number);
2311 #ifdef HAVE_PTHREAD_H
2312                 request->child_pid = NO_SUCH_CHILD_PID;
2313 #endif
2314                 child_state = REQUEST_DONE;
2315                 goto cleanup;
2316         }
2317
2318         if (request->child_state != REQUEST_RUNNING) {
2319                 rad_panic("Internal sanity check failed");
2320         }
2321
2322 #ifdef WITH_COA
2323         /*
2324          *      If it's not in the request hash, it's a CoA request.
2325          *      We hope.
2326          */
2327         if (!request->in_request_hash &&
2328             request->proxy &&
2329             ((request->proxy->code == PW_COA_REQUEST) ||
2330              (request->proxy->code == PW_DISCONNECT_REQUEST))) {
2331                 request->next_callback = NULL;
2332                 child_state = REQUEST_DONE;
2333                 goto cleanup;
2334         }
2335 #endif
2336
2337         /*
2338          *      Catch Auth-Type := Reject BEFORE proxying the packet.
2339          */
2340         if ((request->packet->code == PW_AUTHENTICATION_REQUEST) &&
2341             (request->reply->code == 0) &&
2342             ((vp = pairfind(request->config_items, PW_AUTH_TYPE)) != NULL) &&
2343             (vp->vp_integer == PW_AUTHTYPE_REJECT)) {
2344                 request->reply->code = PW_AUTHENTICATION_REJECT;
2345         }
2346
2347 #ifdef WITH_PROXY
2348         if (request->root->proxy_requests &&
2349             !request->in_proxy_hash &&
2350             (request->reply->code == 0) &&
2351             (request->packet->dst_port != 0) &&
2352             (request->packet->code != PW_STATUS_SERVER)) {
2353                 int rcode = successfully_proxied_request(request);
2354
2355                 if (rcode == 1) return; /* request is invalid */
2356
2357                 /*
2358                  *      Failed proxying it (dead home servers, etc.)
2359                  *      Run it through Post-Proxy-Type = Fail, and
2360                  *      respond to the request.
2361                  *
2362                  *      Note that we're in a child thread here, so we
2363                  *      do NOT re-schedule the request.  Instead, we
2364                  *      do what we would have done, which is run the
2365                  *      pre-handler, a NULL request handler, and then
2366                  *      the post handler.
2367                  */
2368                 if ((rcode < 0) && setup_post_proxy_fail(request)) {
2369                         request_pre_handler(request);
2370                 }
2371
2372                 /*
2373                  *      Else we weren't supposed to proxy it,
2374                  *      OR we proxied it internally to a virutal server.
2375                  */
2376         }
2377 #endif
2378
2379         /*
2380          *      Fake requests don't get encoded or signed.  The caller
2381          *      also requires the reply VP's, so we don't free them
2382          *      here!
2383          */
2384         if (request->packet->dst_port == 0) {
2385                 /* FIXME: RDEBUG going to the next request */
2386 #ifdef HAVE_PTHREAD_H
2387                 request->child_pid = NO_SUCH_CHILD_PID;
2388 #endif
2389                 request->child_state = REQUEST_DONE;
2390                 return;
2391         }
2392
2393 #ifdef WITH_PROXY
2394         /*
2395          *      Copy Proxy-State from the request to the reply.
2396          */
2397         vp = paircopy2(request->packet->vps, PW_PROXY_STATE);
2398         if (vp) pairadd(&request->reply->vps, vp);
2399 #endif
2400
2401         /*
2402          *      Access-Requests get delayed or cached.
2403          */
2404         switch (request->packet->code) {
2405         case PW_AUTHENTICATION_REQUEST:
2406                 gettimeofday(&request->next_when, NULL);
2407
2408                 if (request->reply->code == 0) {
2409                         /*
2410                          *      Check if the lack of response is intentional.
2411                          */
2412                         vp = pairfind(request->config_items,
2413                                       PW_RESPONSE_PACKET_TYPE);
2414                         if (!vp) {
2415                                 RDEBUG2("There was no response configured: rejecting request %d",
2416                                        request->number);
2417                                 request->reply->code = PW_AUTHENTICATION_REJECT;
2418
2419                         } else if (vp->vp_integer == 256) {
2420                                 RDEBUG2("Not responding to request %d",
2421                                        request->number);
2422
2423                                 /*
2424                                  *      Force cleanup after a long
2425                                  *      time, so that we don't
2426                                  *      re-process the packet.
2427                                  */
2428                                 request->next_when.tv_sec += request->root->max_request_time;
2429                                 request->next_callback = cleanup_delay;
2430                                 child_state = REQUEST_CLEANUP_DELAY;
2431                                 break;
2432                         } else {
2433                                 request->reply->code = vp->vp_integer;
2434
2435                         }
2436                 }
2437
2438                 /*
2439                  *      Run rejected packets through
2440                  *
2441                  *      Post-Auth-Type = Reject
2442                  */
2443                 if (request->reply->code == PW_AUTHENTICATION_REJECT) {
2444                         pairdelete(&request->config_items, PW_POST_AUTH_TYPE);
2445                         vp = radius_pairmake(request, &request->config_items,
2446                                              "Post-Auth-Type", "Reject",
2447                                              T_OP_SET);
2448                         if (vp) rad_postauth(request);
2449
2450                         /*
2451                          *      If configured, delay Access-Reject packets.
2452                          *
2453                          *      If request->root->reject_delay = 0, we discover
2454                          *      that we have to send the packet now.
2455                          */
2456                         when = request->received;
2457                         when.tv_sec += request->root->reject_delay;
2458
2459                         if (timercmp(&when, &request->next_when, >)) {
2460                                 RDEBUG2("Delaying reject of request %d for %d seconds",
2461                                        request->number,
2462                                        request->root->reject_delay);
2463                                 request->next_when = when;
2464                                 request->next_callback = reject_delay;
2465 #ifdef HAVE_PTHREAD_H
2466                                 request->child_pid = NO_SUCH_CHILD_PID;
2467 #endif
2468                                 request->child_state = REQUEST_REJECT_DELAY;
2469                                 return;
2470                         }
2471                 }
2472
2473 #ifdef WITH_COA
2474         case PW_COA_REQUEST:
2475         case PW_DISCONNECT_REQUEST:
2476 #endif
2477                 request->next_when.tv_sec += request->root->cleanup_delay;
2478                 request->next_callback = cleanup_delay;
2479                 child_state = REQUEST_CLEANUP_DELAY;
2480                 break;
2481
2482         case PW_ACCOUNTING_REQUEST:
2483                 request->next_callback = NULL; /* just to be safe */
2484                 child_state = REQUEST_DONE;
2485                 break;
2486
2487                 /*
2488                  *      FIXME: Status-Server should probably not be
2489                  *      handled here...
2490                  */
2491         case PW_STATUS_SERVER:
2492                 request->next_callback = NULL;
2493                 child_state = REQUEST_DONE;
2494                 break;
2495
2496         default:
2497                 /*
2498                  *      DHCP, VMPS, etc.
2499                  */
2500                 request->next_callback = NULL;
2501                 child_state = REQUEST_DONE;
2502                 break;
2503         }
2504
2505         DEBUG_PACKET(request, request->reply, 1);
2506         request->listener->send(request->listener, request);
2507
2508 #ifdef WITH_COA
2509         /*
2510          *      Now that we've completely processed the request,
2511          *      see if we need to originate a CoA request.
2512          */
2513         if (request->coa ||
2514             (pairfind(request->config_items, PW_SEND_COA_REQUEST) != NULL)) {
2515                 if (!originated_coa_request(request)) {
2516                         RDEBUG2("Do CoA Fail handler here");
2517                 }
2518                 /* request->coa is stil set, so we can update events */
2519         }
2520 #endif
2521
2522  cleanup:
2523         /*
2524          *      Clean up.  These are no longer needed.
2525          */
2526         pairfree(&request->config_items);
2527
2528         pairfree(&request->packet->vps);
2529         request->username = NULL;
2530         request->password = NULL;
2531
2532         pairfree(&request->reply->vps);
2533
2534 #ifdef WITH_PROXY
2535         if (request->proxy) {
2536                 pairfree(&request->proxy->vps);
2537
2538                 if (request->proxy_reply) {
2539                         pairfree(&request->proxy_reply->vps);
2540                 }
2541
2542 #if 0
2543                 /*
2544                  *      We're not tracking responses from the home
2545                  *      server, we can therefore free this memory in
2546                  *      the child thread.
2547                  */
2548                 if (!request->in_proxy_hash) {
2549                         rad_free(&request->proxy);
2550                         rad_free(&request->proxy_reply);
2551                         request->home_server = NULL;
2552                 }
2553 #endif
2554         }
2555 #endif
2556
2557         RDEBUG2("Finished request %d.", request->number);
2558         rad_assert(child_state >= 0);
2559         request->child_state = child_state;
2560
2561         /*
2562          *      Single threaded mode: update timers now.
2563          */
2564         if (!have_children) wait_a_bit(request);
2565 }
2566
2567
2568 static void received_retransmit(REQUEST *request, const RADCLIENT *client)
2569 {
2570 #ifdef WITH_PROXY
2571         char buffer[128];
2572 #endif
2573
2574         RAD_STATS_TYPE_INC(request->listener, total_dup_requests);
2575         RAD_STATS_CLIENT_INC(request->listener, client, total_dup_requests);
2576
2577         switch (request->child_state) {
2578         case REQUEST_QUEUED:
2579         case REQUEST_RUNNING:
2580 #ifdef WITH_PROXY
2581         discard:
2582 #endif
2583                 radlog(L_ERR, "Discarding duplicate request from "
2584                        "client %s port %d - ID: %d due to unfinished request %d",
2585                        client->shortname,
2586                        request->packet->src_port,request->packet->id,
2587                        request->number);
2588                 break;
2589
2590 #ifdef WITH_PROXY
2591         case REQUEST_PROXIED:
2592                 /*
2593                  *      We're not supposed to have duplicate
2594                  *      accounting packets.  The other states handle
2595                  *      duplicates fine (discard, or send duplicate
2596                  *      reply).  But we do NOT want to retransmit an
2597                  *      accounting request here, because that would
2598                  *      involve updating the Acct-Delay-Time, and
2599                  *      therefore changing the packet Id, etc.
2600                  *
2601                  *      Instead, we just discard the packet.  We may
2602                  *      eventually respond, or the client will send a
2603                  *      new accounting packet.
2604                  *
2605                  *      The same comments go for Status-Server, and
2606                  *      other packet types.
2607                  *
2608                  *      FIXME: coa: when we proxy CoA && Disconnect
2609                  *      packets, this logic has to be fixed.
2610                  */
2611                 if (request->packet->code != PW_AUTHENTICATION_REQUEST) {
2612                         goto discard;
2613                 }
2614
2615                 check_for_zombie_home_server(request);
2616
2617                 /*
2618                  *      If we've just discovered that the home server
2619                  *      is dead, OR the socket has been closed, look for
2620                  *      another connection to a home server.
2621                  */
2622                 if (((request->packet->dst_port != 0) &&
2623                      (request->home_server->state == HOME_STATE_IS_DEAD)) ||
2624                     (request->proxy_listener->status != RAD_LISTEN_STATUS_KNOWN)) {
2625                         home_server *home;
2626
2627                         remove_from_proxy_hash(request);
2628
2629                         home = home_server_ldb(NULL, request->home_pool, request);
2630                         if (!home) {
2631                                 RDEBUG2("Failed to find live home server for request %d", request->number);
2632                         no_home_servers:
2633                                 /*
2634                                  *      Do post-request processing,
2635                                  *      and any insertion of necessary
2636                                  *      events.
2637                                  */
2638                                 post_proxy_fail_handler(request);
2639                                 return;
2640                         }
2641
2642                         request->proxy->code = request->packet->code;
2643
2644                         /*
2645                          *      Free the old packet, to force re-encoding
2646                          */
2647                         free(request->proxy->data);
2648                         request->proxy->data = NULL;
2649                         request->proxy->data_len = 0;
2650
2651                         /*
2652                          *      This request failed over to a virtual
2653                          *      server.  Push it back onto the queue
2654                          *      to be processed.
2655                          */
2656                         if (request->home_server->server) {
2657                                 proxy_fallback_handler(request);
2658                                 return;
2659                         }
2660
2661                         /*
2662                          *      Try to proxy the request.
2663                          */
2664                         if (!proxy_request(request)) {
2665                                 RDEBUG("ERROR: Failed to re-proxy request %d", request->number);
2666                                 goto no_home_servers;
2667                         }
2668
2669                         /*
2670                          *      This code executes in the main server
2671                          *      thread, so there's no need for locking.
2672                          */
2673                         rad_assert(request->next_callback != NULL);
2674                         INSERT_EVENT(request->next_callback, request);
2675                         request->next_callback = NULL;
2676                         return;
2677                 } /* else the home server is still alive */
2678
2679 #ifdef WITH_TCP
2680                 if (request->home_server->proto == IPPROTO_TCP) {
2681                         DEBUG2("Suppressing duplicate proxied request to home server %s port %d proto TCP - ID: %d",
2682                                inet_ntop(request->proxy->dst_ipaddr.af,
2683                                          &request->proxy->dst_ipaddr.ipaddr,
2684                                          buffer, sizeof(buffer)),
2685                                request->proxy->dst_port,
2686                                request->proxy->id);
2687                         break;
2688                 }
2689 #endif
2690
2691                 RDEBUG2("Sending duplicate proxied request to home server %s port %d - ID: %d",
2692                        inet_ntop(request->proxy->dst_ipaddr.af,
2693                                  &request->proxy->dst_ipaddr.ipaddr,
2694                                  buffer, sizeof(buffer)),
2695                        request->proxy->dst_port,
2696                        request->proxy->id);
2697                 request->num_proxied_requests++;
2698
2699                 DEBUG_PACKET(request, request->proxy, 1);
2700                 request->proxy_listener->send(request->proxy_listener,
2701                                               request);
2702                 break;
2703 #endif
2704
2705         case REQUEST_REJECT_DELAY:
2706                 RDEBUG2("Waiting to send Access-Reject "
2707                        "to client %s port %d - ID: %d",
2708                        client->shortname,
2709                        request->packet->src_port, request->packet->id);
2710                 break;
2711
2712         case REQUEST_CLEANUP_DELAY:
2713         case REQUEST_DONE:
2714                 if (request->reply->code == 0) {
2715                         RDEBUG2("Ignoring retransmit from client %s port %d "
2716                                 "- ID: %d, no reply was configured",
2717                                 client->shortname,
2718                                 request->packet->src_port, request->packet->id);
2719                         return;
2720                 }
2721
2722                 /*
2723                  *      FIXME: This sends duplicate replies to
2724                  *      accounting requests, even if Acct-Delay-Time
2725                  *      or Event-Timestamp is in the packet.  In those
2726                  *      cases, the Id should be changed, and the packet
2727                  *      re-calculated.
2728                  */
2729                 RDEBUG2("Sending duplicate reply "
2730                        "to client %s port %d - ID: %d",
2731                        client->shortname,
2732                        request->packet->src_port, request->packet->id);
2733                 DEBUG_PACKET(request, request->reply, 1);
2734                 request->listener->send(request->listener, request);
2735                 break;
2736         }
2737 }
2738
2739
2740 static void received_conflicting_request(REQUEST *request,
2741                                          const RADCLIENT *client)
2742 {
2743         radlog(L_ERR, "Received conflicting packet from "
2744                "client %s port %d - ID: %d due to unfinished request %d.  Giving up on old request.",
2745                client->shortname,
2746                request->packet->src_port, request->packet->id,
2747                request->number);
2748
2749         /*
2750          *      Nuke it from the request hash, so we can receive new
2751          *      packets.
2752          */
2753         remove_from_request_hash(request);
2754
2755         switch (request->child_state) {
2756                 /*
2757                  *      Tell it to stop, and wait for it to do so.
2758                  */
2759         default:
2760                 request->master_state = REQUEST_STOP_PROCESSING;
2761                 request->delay += request->delay >> 1;
2762
2763                 tv_add(&request->when, request->delay);
2764
2765                 INSERT_EVENT(wait_for_child_to_die, request);
2766                 return;
2767
2768                 /*
2769                  *      Catch race conditions.  It may have switched
2770                  *      from running to done while this code is being
2771                  *      executed.
2772                  */
2773         case REQUEST_REJECT_DELAY:
2774         case REQUEST_CLEANUP_DELAY:
2775         case REQUEST_DONE:
2776                 break;
2777         }
2778 }
2779
2780
2781 static int can_handle_new_request(RADIUS_PACKET *packet,
2782                                   RADCLIENT *client,
2783                                   struct main_config_t *root)
2784 {
2785         /*
2786          *      Count the total number of requests, to see if
2787          *      there are too many.  If so, return with an
2788          *      error.
2789          */
2790         if (root->max_requests) {
2791                 int request_count = fr_packet_list_num_elements(pl);
2792
2793                 /*
2794                  *      This is a new request.  Let's see if
2795                  *      it makes us go over our configured
2796                  *      bounds.
2797                  */
2798                 if (request_count > root->max_requests) {
2799                         radlog(L_ERR, "Dropping request (%d is too many): "
2800                                "from client %s port %d - ID: %d", request_count,
2801                                client->shortname,
2802                                packet->src_port, packet->id);
2803                         radlog(L_INFO, "WARNING: Please check the configuration file.\n"
2804                                "\tThe value for 'max_requests' is probably set too low.\n");
2805                         return 0;
2806                 } /* else there were a small number of requests */
2807         } /* else there was no configured limit for requests */
2808
2809         /*
2810          *      FIXME: Add per-client checks.  If one client is sending
2811          *      too many packets, start discarding them.
2812          *
2813          *      We increment the counters here, and decrement them
2814          *      when the response is sent... somewhere in this file.
2815          */
2816
2817         /*
2818          *      FUTURE: Add checks for system load.  If the system is
2819          *      busy, start dropping requests...
2820          *
2821          *      We can probably keep some statistics ourselves...  if
2822          *      there are more requests coming in than we can handle,
2823          *      start dropping some.
2824          */
2825
2826         return 1;
2827 }
2828
2829
2830 int received_request(rad_listen_t *listener,
2831                      RADIUS_PACKET *packet, REQUEST **prequest,
2832                      RADCLIENT *client)
2833 {
2834         RADIUS_PACKET **packet_p;
2835         REQUEST *request = NULL;
2836         struct main_config_t *root = &mainconfig;
2837
2838         packet_p = fr_packet_list_find(pl, packet);
2839         if (packet_p) {
2840                 request = fr_packet2myptr(REQUEST, packet, packet_p);
2841                 rad_assert(request->in_request_hash);
2842
2843                 if ((request->packet->data_len == packet->data_len) &&
2844                     (memcmp(request->packet->vector, packet->vector,
2845                             sizeof(packet->vector)) == 0)) {
2846                         received_retransmit(request, client);
2847                         return 0;
2848                 }
2849
2850                 /*
2851                  *      The new request is different from the old one,
2852                  *      but maybe the old is finished.  If so, delete
2853                  *      the old one.
2854                  */
2855                 switch (request->child_state) {
2856                         struct timeval when;
2857
2858                 default:
2859                         /*
2860                          *      Special hacks for race conditions.
2861                          *      The reply is encoded, and therefore
2862                          *      likely sent.  We received a *new*
2863                          *      packet from the client, likely before
2864                          *      the next line or two of code which
2865                          *      updated the child state.  In this
2866                          *      case, just accept the new request.
2867                          */
2868                         if ((request->reply->code != 0) &&
2869                             request->reply->data) {
2870                                 radlog(L_INFO, "WARNING: Allowing fast client %s port %d - ID: %d for recent request %d.",
2871                                        client->shortname,
2872                                        packet->src_port, packet->id,
2873                                        request->number);
2874                                 remove_from_request_hash(request);
2875                                 request = NULL;
2876                                 break;
2877                         }
2878
2879                         gettimeofday(&when, NULL);
2880                         when.tv_sec -= 1;
2881
2882                         /*
2883                          *      If the cached request was received
2884                          *      within the last second, then we
2885                          *      discard the NEW request instead of the
2886                          *      old one.  This will happen ONLY when
2887                          *      the client is severely broken, and is
2888                          *      sending conflicting packets very
2889                          *      quickly.
2890                          */
2891                         if (timercmp(&when, &request->received, <)) {
2892                                 radlog(L_ERR, "Discarding conflicting packet from "
2893                                        "client %s port %d - ID: %d due to recent request %d.",
2894                                        client->shortname,
2895                                        packet->src_port, packet->id,
2896                                        request->number);
2897                                 return 0;
2898                         }
2899
2900                         received_conflicting_request(request, client);
2901                         request = NULL;
2902                         break;
2903
2904                 case REQUEST_REJECT_DELAY:
2905                 case REQUEST_CLEANUP_DELAY:
2906                         request->child_state = REQUEST_DONE;
2907                 case REQUEST_DONE:
2908                         cleanup_delay(request);
2909                         request = NULL;
2910                         break;
2911                 }
2912         }
2913
2914         /*
2915          *      We may want to quench the new request.
2916          */
2917         if ((listener->type != RAD_LISTEN_DETAIL) &&
2918             !can_handle_new_request(packet, client, root)) {
2919                 return 0;
2920         }
2921
2922         /*
2923          *      Create and initialize the new request.
2924          */
2925         request = request_alloc(); /* never fails */
2926
2927         if ((request->reply = rad_alloc(0)) == NULL) {
2928                 radlog(L_ERR, "No memory");
2929                 exit(1);
2930         }
2931
2932         request->listener = listener;
2933         request->client = client;
2934         request->packet = packet;
2935         request->packet->timestamp = request->timestamp;
2936         request->number = request_num_counter++;
2937         request->priority = listener->type;
2938 #ifdef HAVE_PTHREAD_H
2939         request->child_pid = NO_SUCH_CHILD_PID;
2940 #endif
2941
2942         /*
2943          *      Status-Server packets go to the head of the queue.
2944          */
2945         if (request->packet->code == PW_STATUS_SERVER) request->priority = 0;
2946
2947         /*
2948          *      Set virtual server identity
2949          */
2950         if (client->server) {
2951                 request->server = client->server;
2952         } else if (listener->server) {
2953                 request->server = listener->server;
2954         } else {
2955                 request->server = NULL;
2956         }
2957
2958         /*
2959          *      Remember the request in the list.
2960          */
2961         if (!fr_packet_list_insert(pl, &request->packet)) {
2962                 radlog(L_ERR, "Failed to insert request %d in the list of live requests: discarding", request->number);
2963                 ev_request_free(&request);
2964                 return 0;
2965         }
2966
2967         request->in_request_hash = TRUE;
2968         request->root = root;
2969         root->refcount++;
2970 #ifdef WITH_TCP
2971         request->listener->count++;
2972 #endif
2973
2974         /*
2975          *      The request passes many of our sanity checks.
2976          *      From here on in, if anything goes wrong, we
2977          *      send a reject message, instead of dropping the
2978          *      packet.
2979          */
2980
2981         /*
2982          *      Build the reply template from the request.
2983          */
2984
2985         request->reply->sockfd = request->packet->sockfd;
2986         request->reply->dst_ipaddr = request->packet->src_ipaddr;
2987         request->reply->src_ipaddr = request->packet->dst_ipaddr;
2988         request->reply->dst_port = request->packet->src_port;
2989         request->reply->src_port = request->packet->dst_port;
2990         request->reply->id = request->packet->id;
2991         request->reply->code = 0; /* UNKNOWN code */
2992         memcpy(request->reply->vector, request->packet->vector,
2993                sizeof(request->reply->vector));
2994         request->reply->vps = NULL;
2995         request->reply->data = NULL;
2996         request->reply->data_len = 0;
2997
2998         request->master_state = REQUEST_ACTIVE;
2999         request->child_state = REQUEST_QUEUED;
3000         request->next_callback = NULL;
3001
3002         gettimeofday(&request->received, NULL);
3003         request->timestamp = request->received.tv_sec;
3004         request->when = request->received;
3005
3006         request->delay = USEC;
3007
3008         tv_add(&request->when, request->delay);
3009
3010         INSERT_EVENT(wait_a_bit, request);
3011
3012         *prequest = request;
3013         return 1;
3014 }
3015
3016
3017 #ifdef WITH_PROXY
3018 REQUEST *received_proxy_response(RADIUS_PACKET *packet)
3019 {
3020         char            buffer[128];
3021         REQUEST         *request;
3022
3023         /*
3024          *      Also removes from the proxy hash if responses == requests
3025          */
3026         request = lookup_in_proxy_hash(packet);
3027
3028         if (!request) {
3029                 radlog(L_PROXY, "No outstanding request was found for reply from host %s port %d - ID %d",
3030                        inet_ntop(packet->src_ipaddr.af,
3031                                  &packet->src_ipaddr.ipaddr,
3032                                  buffer, sizeof(buffer)),
3033                        packet->src_port, packet->id);
3034                 return NULL;
3035         }
3036
3037         /*
3038          *      We haven't replied to the NAS, but we have seen an
3039          *      earlier reply from the home server.  Ignore this packet,
3040          *      as we're likely still processing the previous reply.
3041          */
3042         if (request->proxy_reply) {
3043                 if (memcmp(request->proxy_reply->vector,
3044                            packet->vector,
3045                            sizeof(request->proxy_reply->vector)) == 0) {
3046                         RDEBUG2("Discarding duplicate reply from host %s port %d  - ID: %d for request %d",
3047                                inet_ntop(packet->src_ipaddr.af,
3048                                          &packet->src_ipaddr.ipaddr,
3049                                          buffer, sizeof(buffer)),
3050                                packet->src_port, packet->id,
3051                                request->number);
3052                 } else {
3053                         /*
3054                          *      ? The home server gave us a new proxy
3055                          *      reply which doesn't match the old
3056                          *      one.  Delete it.
3057                          */
3058                         RDEBUG2("Ignoring conflicting proxy reply");
3059                 }
3060
3061                 /* assert that there's an event queued for request? */
3062                 return NULL;
3063         }
3064
3065         /*
3066          *      Verify the packet before doing ANYTHING with it.  This
3067          *      means we're doing more MD5 checks in the server core.
3068          *      However, we can fix that by moving to multiple threads
3069          *      listening on sockets.
3070          *
3071          *      We do this AFTER looking the request up in the hash,
3072          *      and AFTER vhecking if we saw a previous request.  This
3073          *      helps minimize the DoS effect of people attacking us
3074          *      with spoofed packets.
3075          */
3076         if (rad_verify(packet, request->proxy,
3077                        request->home_server->secret) != 0) {
3078                 DEBUG("Ignoring spoofed proxy reply.  Signature is invalid");
3079                 return NULL;
3080         }
3081
3082         gettimeofday(&now, NULL);
3083
3084         /*
3085          *      Maybe move this earlier in the decision process?
3086          *      Having it here means that late or duplicate proxy
3087          *      replies no longer get the home server marked as
3088          *      "alive".  This might be good for stability, though.
3089          *
3090          *      FIXME: Do we really want to do this whenever we
3091          *      receive a packet?  Setting this here means that we
3092          *      mark it alive on *any* packet, even if it's lost all
3093          *      of the *other* packets in the last 10s.
3094          */
3095         request->home_server->state = HOME_STATE_ALIVE;
3096
3097 #ifdef WITH_COA
3098         /*
3099          *      When originating CoA, the "proxy" reply is the reply
3100          *      to the CoA request that we originated.  At this point,
3101          *      the original request is finished, and it has a reply.
3102          *
3103          *      However, if we haven't separated the two requests, do
3104          *      so now.  This is done so that cleaning up the original
3105          *      request won't cause the CoA request to be free'd.  See
3106          *      util.c, request_free()
3107          */
3108         if (request->parent && (request->parent->coa == request)) {
3109                 request->parent->coa = NULL;
3110                 request->parent = NULL;
3111
3112         } else
3113                 /*
3114                  *      Skip the next set of checks, as the original
3115                  *      reply is cached.  We want to be able to still
3116                  *      process the CoA reply, AND to reference the
3117                  *      original request/reply.
3118                  *
3119                  *      This is getting to be really quite a bit of a
3120                  *      hack.
3121                  */
3122 #endif
3123
3124         /*
3125          *      If there's a reply to the NAS, ignore everything
3126          *      related to proxy responses
3127          */
3128         if (request->reply && request->reply->code != 0) {
3129                 RDEBUG2("Ignoring proxy reply that arrived after we sent a reply to the NAS");
3130                 return NULL;
3131         }
3132
3133 #ifdef WITH_STATS
3134         /*
3135          *      The average includes our time to receive packets and
3136          *      look them up in the hashes, which should be the same
3137          *      for all packets.
3138          *
3139          *      We update the response time only for the FIRST packet
3140          *      we receive.
3141          */
3142         if (request->home_server->ema.window > 0) {
3143                 radius_stats_ema(&request->home_server->ema,
3144                                  &now, &request->proxy_when);
3145         }
3146 #endif
3147
3148         switch (request->child_state) {
3149         case REQUEST_QUEUED:
3150         case REQUEST_RUNNING:
3151                 radlog(L_ERR, "Internal sanity check failed for child state");
3152                 /* FALL-THROUGH */
3153
3154         case REQUEST_REJECT_DELAY:
3155         case REQUEST_CLEANUP_DELAY:
3156         case REQUEST_DONE:
3157                 radlog(L_ERR, "Reply from home server %s port %d  - ID: %d arrived too late for request %d. Try increasing 'retry_delay' or 'max_request_time'",
3158                        inet_ntop(packet->src_ipaddr.af,
3159                                  &packet->src_ipaddr.ipaddr,
3160                                  buffer, sizeof(buffer)),
3161                        packet->src_port, packet->id,
3162                        request->number);
3163                 /* assert that there's an event queued for request? */
3164                 return NULL;
3165
3166         case REQUEST_PROXIED:
3167                 break;
3168         }
3169
3170         request->proxy_reply = packet;
3171
3172 #if 0
3173         /*
3174          *      Perform RTT calculations, as per RFC 2988 (for TCP).
3175          *      Note that we only do so on the first response.
3176          */
3177         if ((request->num_proxied_responses == 1)
3178                 int rtt;
3179                 home_server *home = request->home_server;
3180
3181                 rtt = now.tv_sec - request->proxy_when.tv_sec;
3182                 rtt *= USEC;
3183                 rtt += now.tv_usec;
3184                 rtt -= request->proxy_when.tv_usec;
3185
3186                 if (!home->has_rtt) {
3187                         home->has_rtt = TRUE;
3188
3189                         home->srtt = rtt;
3190                         home->rttvar = rtt / 2;
3191
3192                 } else {
3193                         home->rttvar -= home->rttvar >> 2;
3194                         home->rttvar += (home->srtt - rtt);
3195                         home->srtt -= home->srtt >> 3;
3196                         home->srtt += rtt >> 3;
3197                 }
3198
3199                 home->rto = home->srtt;
3200                 if (home->rttvar > (USEC / 4)) {
3201                         home->rto += home->rttvar * 4;
3202                 } else {
3203                         home->rto += USEC;
3204                 }
3205         }
3206 #endif
3207
3208         /*
3209          *      There's no incoming request, so it's a proxied packet
3210          *      we originated.
3211          */
3212         if (!request->packet) {
3213                 received_response_to_ping(request);
3214                 request->proxy_reply = NULL; /* caller will free it */
3215                 ev_request_free(&request);
3216                 return NULL;
3217         }
3218
3219         request->child_state = REQUEST_QUEUED;
3220         request->when = now;
3221         request->delay = USEC;
3222         request->priority = RAD_LISTEN_PROXY;
3223         tv_add(&request->when, request->delay);
3224
3225         /*
3226          *      Wait a bit will take care of max_request_time
3227          */
3228         INSERT_EVENT(wait_a_bit, request);
3229
3230         return request;
3231 }
3232
3233 #endif /* WITH_PROXY */
3234
3235 #ifdef WITH_TCP
3236 static void tcp_socket_lifetime(void *ctx)
3237 {
3238         rad_listen_t *listener = ctx;
3239         char buffer[256];
3240
3241         listener->print(listener, buffer, sizeof(buffer));
3242
3243         DEBUG("Reached maximum lifetime on socket %s", buffer);
3244
3245         listener->status = RAD_LISTEN_STATUS_CLOSED;
3246         event_new_fd(listener);
3247 }
3248
3249 static void tcp_socket_idle_timeout(void *ctx)
3250 {
3251         rad_listen_t *listener = ctx;
3252         listen_socket_t *sock = listener->data;
3253         char buffer[256];
3254
3255         fr_event_now(el, &now); /* should always succeed... */
3256
3257         rad_assert(sock->home != NULL);
3258
3259         /*
3260          *      We implement idle timeout by polling, because it's
3261          *      cheaper than resetting the idle timeout every time
3262          *      we send / receive a packet.
3263          */
3264         if ((sock->last_packet + sock->home->idle_timeout) > now.tv_sec) {
3265                 struct timeval when;
3266                 void *fun = tcp_socket_idle_timeout;
3267
3268                 when.tv_sec = sock->last_packet;
3269                 when.tv_sec += sock->home->idle_timeout;
3270                 when.tv_usec = 0;
3271
3272                 if (sock->home->lifetime &&
3273                     (sock->opened + sock->home->lifetime < when.tv_sec)) {
3274                         when.tv_sec = sock->opened + sock->home->lifetime;
3275                         fun = tcp_socket_lifetime;
3276                 }
3277
3278                 if (!fr_event_insert(el, fun, listener, &when, &sock->ev)) {
3279                         rad_panic("Failed to insert event");
3280                 }
3281
3282                 return;
3283         }
3284
3285         listener->print(listener, buffer, sizeof(buffer));
3286
3287         DEBUG("Reached idle timeout on socket %s", buffer);
3288
3289         listener->status = RAD_LISTEN_STATUS_CLOSED;
3290         event_new_fd(listener);
3291 }
3292 #endif
3293
3294 void event_new_fd(rad_listen_t *this)
3295 {
3296         char buffer[1024];
3297
3298         if (this->status == RAD_LISTEN_STATUS_KNOWN) return;
3299
3300         this->print(this, buffer, sizeof(buffer));
3301
3302         if (this->status == RAD_LISTEN_STATUS_INIT) {
3303                 if (just_started) {
3304                         DEBUG("Listening on %s", buffer);
3305                 } else {
3306                         radlog(L_INFO, " ... adding new socket %s", buffer);
3307                 }
3308
3309 #ifdef WITH_PROXY
3310                 /*
3311                  *      Add it to the list of sockets we can use.
3312                  *      Server sockets (i.e. auth/acct) are never
3313                  *      added to the packet list.
3314                  */
3315                 if (this->type == RAD_LISTEN_PROXY) {
3316                         listen_socket_t *sock = this->data;
3317
3318                         PTHREAD_MUTEX_LOCK(&proxy_mutex);
3319                         if (!fr_packet_list_socket_add(proxy_list, this->fd,
3320                                                        sock->proto,
3321                                                        &sock->other_ipaddr, sock->other_port,
3322                                                        this)) {
3323                                 radlog(L_ERR, "Fatal error adding socket: %s",
3324                                        fr_strerror());
3325                                 exit(1);
3326
3327                         }
3328
3329                         if (sock->home) {
3330                                 sock->home->num_connections++;
3331
3332                                 /*
3333                                  *      If necessary, add it to the list of
3334                                  *      new proxy listeners.
3335                                  */
3336                                 if (sock->home->lifetime || sock->home->idle_timeout) {
3337                                         this->next = proxy_listener_list;
3338                                         proxy_listener_list = this;
3339                                 }
3340                         }
3341                         PTHREAD_MUTEX_UNLOCK(&proxy_mutex);
3342
3343                         /*
3344                          *      Tell the main thread that we've added
3345                          *      a proxy listener, but only if we need
3346                          *      to update the event list.  Do this
3347                          *      with the mutex unlocked, to reduce
3348                          *      contention.
3349                          */
3350                         if (sock->home) {
3351                                 if (sock->home->lifetime || sock->home->idle_timeout) {
3352                                         radius_signal_self(RADIUS_SIGNAL_SELF_NEW_FD);
3353                                 }
3354                         }
3355                 }
3356 #endif
3357
3358 #ifdef WITH_DETAIL
3359                 /*
3360                  *      Detail files are always known, and aren't
3361                  *      put into the socket event loop.
3362                  */
3363                 if (this->type == RAD_LISTEN_DETAIL) {
3364                         this->status = RAD_LISTEN_STATUS_KNOWN;
3365
3366                         /*
3367                          *      Set up the first poll interval.
3368                          */
3369                         event_poll_detail(this);
3370                         return;
3371                 }
3372 #endif
3373
3374                 FD_MUTEX_LOCK(&fd_mutex);
3375                 if (!fr_event_fd_insert(el, 0, this->fd,
3376                                         event_socket_handler, this)) {
3377                         radlog(L_ERR, "Failed remembering handle for proxy socket!");
3378                         exit(1);
3379                 }
3380                 FD_MUTEX_UNLOCK(&fd_mutex);
3381
3382                 this->status = RAD_LISTEN_STATUS_KNOWN;
3383                 return;
3384         }
3385
3386         /*
3387          *      Something went wrong with the socket: make it harmless.
3388          */
3389         if (this->status == RAD_LISTEN_STATUS_REMOVE_FD) {
3390                 int devnull;
3391
3392                 /*
3393                  *      Remove it from the list of live FD's.
3394                  */
3395                 FD_MUTEX_LOCK(&fd_mutex);
3396                 fr_event_fd_delete(el, 0, this->fd);
3397                 FD_MUTEX_UNLOCK(&fd_mutex);
3398
3399 #ifdef WITH_PROXY
3400                 if (this->type != RAD_LISTEN_PROXY)
3401 #endif
3402                 {
3403                         if (this->count != 0) {
3404                                 fr_packet_list_walk(pl, this,
3405                                                     remove_all_requests);
3406                         }
3407
3408                         if (this->count == 0) {
3409                                 this->status = RAD_LISTEN_STATUS_FINISH;
3410                                 goto finish;
3411                         }
3412                 }
3413 #ifdef WITH_PROXY
3414                 else {
3415                         int count = this->count;
3416
3417                         /*
3418                          *      Duplicate code
3419                          */
3420                         PTHREAD_MUTEX_LOCK(&proxy_mutex);
3421                         if (!fr_packet_list_socket_freeze(proxy_list,
3422                                                           this->fd)) {
3423                                 radlog(L_ERR, "Fatal error freezing socket: %s",
3424                                        fr_strerror());
3425                                 exit(1);
3426                         }
3427
3428                         /*
3429                          *      Doing this with the proxy mutex held
3430                          *      is a Bad Thing.  We should move to
3431                          *      finer-grained mutexes.
3432                          */
3433                         count = this->count;
3434                         if (count > 0) {
3435                                 fr_packet_list_walk(proxy_list, this,
3436                                                     remove_all_proxied_requests);
3437                         }
3438                         count = this->count; /* protected by mutex */
3439                         PTHREAD_MUTEX_UNLOCK(&proxy_mutex);
3440
3441                         if (count == 0) {
3442                                 this->status = RAD_LISTEN_STATUS_FINISH;
3443                                 goto finish;
3444                         }
3445                 }
3446 #endif
3447
3448                 /*
3449                  *      Re-open the socket, pointing it to /dev/null.
3450                  *      This means that all writes proceed without
3451                  *      blocking, and all reads return "no data".
3452                  *
3453                  *      This leaves the socket active, so any child
3454                  *      threads won't go insane.  But it means that
3455                  *      they cannot send or receive any packets.
3456                  *
3457                  *      This is EXTRA work in the normal case, when
3458                  *      sockets are closed without error.  But it lets
3459                  *      us have one simple processing method for all
3460                  *      sockets.
3461                  */
3462                 devnull = open("/dev/null", O_RDWR);
3463                 if (devnull < 0) {
3464                         radlog(L_ERR, "FATAL failure opening /dev/null: %s",
3465                                strerror(errno));
3466                         exit(1);
3467                 }
3468                 if (dup2(devnull, this->fd) < 0) {
3469                         radlog(L_ERR, "FATAL failure closing socket: %s",
3470                                strerror(errno));
3471                         exit(1);
3472                 }
3473                 close(devnull);
3474
3475                 this->status = RAD_LISTEN_STATUS_CLOSED;
3476
3477                 /*
3478                  *      Fall through to the next section.
3479                  */
3480         }
3481
3482         /*
3483          *      Called ONLY from the main thread.  On the following
3484          *      conditions:
3485          *
3486          *      idle timeout
3487          *      max lifetime
3488          *
3489          *      (and falling through from "forcibly close FD" above)
3490          *      client closed connection on us
3491          *      client sent us a bad packet.
3492          */
3493         if (this->status == RAD_LISTEN_STATUS_CLOSED) {
3494                 int count = this->count;
3495                 rad_assert(this->type != RAD_LISTEN_DETAIL);
3496
3497 #ifdef WITH_PROXY
3498                 /*
3499                  *      Remove it from the list of active sockets, so
3500                  *      that it isn't used when proxying new packets.
3501                  */
3502                 if (this->type == RAD_LISTEN_PROXY) {
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                         count = this->count; /* protected by mutex */
3511                         PTHREAD_MUTEX_UNLOCK(&proxy_mutex);
3512                 }
3513 #endif
3514
3515                 /*
3516                  *      Requests are still using the socket.  Wait for
3517                  *      them to finish.
3518                  */
3519                 if (count != 0) {
3520                         struct timeval when;
3521                         listen_socket_t *sock = this->data;
3522
3523                         /*
3524                          *      Try again to clean up the socket in 30
3525                          *      seconds.
3526                          */
3527                         gettimeofday(&when, NULL);
3528                         when.tv_sec += 30;
3529
3530                         if (!fr_event_insert(el,
3531                                              (fr_event_callback_t) event_new_fd,
3532                                              this, &when, &sock->ev)) {
3533                                 rad_panic("Failed to insert event");
3534                         }
3535
3536                         return;
3537                 }
3538
3539                 /*
3540                  *      No one is using this socket: we can delete it
3541                  *      immediately.
3542                  */
3543                 this->status = RAD_LISTEN_STATUS_FINISH;
3544         }
3545
3546 finish:
3547         if (this->status == RAD_LISTEN_STATUS_FINISH) {
3548                 listen_socket_t *sock = this->data;
3549
3550                 rad_assert(this->count == 0);
3551                 radlog(L_INFO, " ... closing socket %s", buffer);
3552
3553                 /*
3554                  *      Remove it from the list of live FD's.  Note
3555                  *      that it MAY also have been removed above.  We
3556                  *      do it again here, to catch the case of sockets
3557                  *      closing on idle timeout, or max
3558                  *      lifetime... AFTER all requests have finished
3559                  *      using it.
3560                  */
3561                 FD_MUTEX_LOCK(&fd_mutex);
3562                 fr_event_fd_delete(el, 0, this->fd);
3563                 FD_MUTEX_UNLOCK(&fd_mutex);
3564
3565 #ifdef WITH_PROXY
3566                 /*
3567                  *      Remove it from the list of sockets to be used
3568                  *      when proxying.
3569                  */
3570                 if (this->type == RAD_LISTEN_PROXY) {
3571                         PTHREAD_MUTEX_LOCK(&proxy_mutex);
3572                         if (!fr_packet_list_socket_remove(proxy_list,
3573                                                           this->fd, NULL)) {
3574                                 radlog(L_ERR, "Fatal error removing socket: %s",
3575                                        fr_strerror());
3576                                 exit(1);
3577                         }
3578                         if (sock->home) sock->home->num_connections--;
3579                         PTHREAD_MUTEX_UNLOCK(&proxy_mutex);
3580                 }
3581 #endif
3582
3583                 /*
3584                  *      Remove any pending cleanups.
3585                  */
3586                 if (sock->ev) fr_event_delete(el, &sock->ev);
3587
3588                 /*
3589                  *      And finally, close the socket.
3590                  */
3591                 listen_free(&this);
3592         }
3593 }
3594
3595 static void handle_signal_self(int flag)
3596 {
3597         if ((flag & (RADIUS_SIGNAL_SELF_EXIT | RADIUS_SIGNAL_SELF_TERM)) != 0) {
3598                 if ((flag & RADIUS_SIGNAL_SELF_EXIT) != 0) {
3599                         radlog(L_INFO, "Received TERM signal");
3600                         fr_event_loop_exit(el, 1);
3601                 } else {
3602                         fr_event_loop_exit(el, 2);
3603                 }
3604
3605                 return;
3606         } /* else exit/term flags weren't set */
3607
3608         /*
3609          *      Tell the even loop to stop processing.
3610          */
3611         if ((flag & RADIUS_SIGNAL_SELF_HUP) != 0) {
3612                 time_t when;
3613                 static time_t last_hup = 0;
3614
3615                 radlog(L_INFO, "Received HUP signal.");
3616
3617                 when = time(NULL);
3618                 if ((int) (when - last_hup) < 5) {
3619                         radlog(L_INFO, "Ignoring HUP (less than 5s since last one)");
3620                         return;
3621                 }
3622                 last_hup = when;
3623
3624                 fr_event_loop_exit(el, 0x80);
3625         }
3626
3627 #ifdef WITH_DETAIL
3628         if ((flag & RADIUS_SIGNAL_SELF_DETAIL) != 0) {
3629                 rad_listen_t *this;
3630
3631                 /*
3632                  *      FIXME: O(N) loops suck.
3633                  */
3634                 for (this = mainconfig.listen;
3635                      this != NULL;
3636                      this = this->next) {
3637                         if (this->type != RAD_LISTEN_DETAIL) continue;
3638
3639                         /*
3640                          *      This one didn't send the signal, skip
3641                          *      it.
3642                          */
3643                         if (!this->decode(this, NULL)) continue;
3644
3645                         /*
3646                          *      Go service the interrupt.
3647                          */
3648                         event_poll_detail(this);
3649                 }
3650         }
3651 #endif
3652
3653 #ifdef WITH_PROXY
3654         /*
3655          *      Add event handlers for idle timeouts && maximum lifetime.
3656          */
3657         if ((flag & RADIUS_SIGNAL_SELF_NEW_FD) != 0) {
3658                 struct timeval when;
3659                 void *fun = NULL;
3660
3661                 if (!fr_event_now(el, &now)) gettimeofday(&now, NULL);
3662
3663                 PTHREAD_MUTEX_LOCK(&proxy_mutex);
3664
3665                 while (proxy_listener_list) {
3666                         rad_listen_t *this = proxy_listener_list;
3667                         listen_socket_t *sock = this->data;
3668
3669                         proxy_listener_list = this->next;
3670                         this->next = NULL;
3671
3672                         if (!sock->home) continue; /* skip UDP sockets */
3673
3674                         when = now;
3675
3676                         if (!sock->home->idle_timeout) {
3677                                 rad_assert(sock->home->lifetime != 0);
3678
3679                                 when.tv_sec += sock->home->lifetime;
3680                                 fun = tcp_socket_lifetime;
3681                         } else {
3682                                 rad_assert(sock->home->idle_timeout != 0);
3683
3684                                 when.tv_sec += sock->home->idle_timeout;
3685                                 fun = tcp_socket_idle_timeout;
3686                         }
3687
3688                         if (!fr_event_insert(el, fun, this, &when,
3689                                              &(sock->ev))) {
3690                                 rad_panic("Failed to insert event");
3691                         }
3692                 }
3693
3694                 PTHREAD_MUTEX_UNLOCK(&proxy_mutex);
3695         }
3696 #endif
3697 }
3698
3699 #ifdef __MINGW32__
3700 void radius_signal_self(int flag)
3701 {
3702         handle_signal_self(flag);
3703 }
3704 #else
3705 /*
3706  *      Inform ourselves that we received a signal.
3707  */
3708 void radius_signal_self(int flag)
3709 {
3710         ssize_t rcode;
3711         uint8_t buffer[16];
3712
3713         /*
3714          *      The read MUST be non-blocking for this to work.
3715          */
3716         rcode = read(self_pipe[0], buffer, sizeof(buffer));
3717         if (rcode > 0) {
3718                 ssize_t i;
3719
3720                 for (i = 0; i < rcode; i++) {
3721                         buffer[0] |= buffer[i];
3722                 }
3723         } else {
3724                 buffer[0] = 0;
3725         }
3726
3727         buffer[0] |= flag;
3728
3729         write(self_pipe[1], buffer, 1);
3730 }
3731
3732
3733 static void event_signal_handler(UNUSED fr_event_list_t *xel,
3734                                  UNUSED int fd, UNUSED void *ctx)
3735 {
3736         ssize_t i, rcode;
3737         uint8_t buffer[32];
3738
3739         rcode = read(self_pipe[0], buffer, sizeof(buffer));
3740         if (rcode <= 0) return;
3741
3742         /*
3743          *      Merge pending signals.
3744          */
3745         for (i = 0; i < rcode; i++) {
3746                 buffer[0] |= buffer[i];
3747         }
3748
3749         handle_signal_self(buffer[0]);
3750 }
3751 #endif
3752
3753
3754 static void event_socket_handler(fr_event_list_t *xel, UNUSED int fd,
3755                                  void *ctx)
3756 {
3757         rad_listen_t *listener = ctx;
3758         RAD_REQUEST_FUNP fun;
3759         REQUEST *request;
3760
3761         rad_assert(xel == el);
3762
3763         xel = xel;
3764
3765         if (listener->fd < 0) rad_panic("Socket was closed on us!");
3766
3767         if (!listener->recv(listener, &fun, &request)) return;
3768
3769         if (!thread_pool_addrequest(request, fun)) {
3770                 request->child_state = REQUEST_DONE;
3771         }
3772 }
3773
3774 typedef struct listen_detail_t {
3775         fr_event_t      *ev;
3776 } listen_detail_t;
3777
3778 /*
3779  *      This function is called periodically to see if this detail
3780  *      file is available for reading.
3781  */
3782 static void event_poll_detail(void *ctx)
3783 {
3784         int rcode, delay;
3785         RAD_REQUEST_FUNP fun;
3786         REQUEST *request;
3787         rad_listen_t *this = ctx;
3788         struct timeval when;
3789         listen_detail_t *detail = this->data;
3790
3791         rad_assert(this->type == RAD_LISTEN_DETAIL);
3792
3793         /*
3794          *      Try to read something.
3795          *
3796          *      FIXME: This does poll AND receive.
3797          */
3798         rcode = this->recv(this, &fun, &request);
3799         if (rcode != 0) {
3800                 rad_assert(fun != NULL);
3801                 rad_assert(request != NULL);
3802
3803                 if (!thread_pool_addrequest(request, fun)) {
3804                         request->child_state = REQUEST_DONE;
3805                 }
3806         }
3807
3808         if (!fr_event_now(el, &now)) gettimeofday(&now, NULL);
3809         when = now;
3810
3811         /*
3812          *      Backdoor API to get the delay until the next poll
3813          *      time.
3814          */
3815         delay = this->encode(this, NULL);
3816         tv_add(&when, delay);
3817
3818         if (!fr_event_insert(el, event_poll_detail, this,
3819                              &when, &detail->ev)) {
3820                 radlog(L_ERR, "Failed creating handler");
3821                 exit(1);
3822         }
3823 }
3824
3825
3826 static void event_status(struct timeval *wake)
3827 {
3828 #if !defined(HAVE_PTHREAD_H) && defined(WNOHANG)
3829         int argval;
3830 #endif
3831
3832         if (debug_flag == 0) {
3833                 if (just_started) {
3834                         radlog(L_INFO, "Ready to process requests.");
3835                         just_started = FALSE;
3836                 }
3837                 return;
3838         }
3839
3840         if (!wake) {
3841                 radlog(L_INFO, "Ready to process requests.");
3842
3843         } else if ((wake->tv_sec != 0) ||
3844                    (wake->tv_usec >= 100000)) {
3845                 DEBUG("Waking up in %d.%01u seconds.",
3846                       (int) wake->tv_sec, (unsigned int) wake->tv_usec / 100000);
3847         }
3848
3849
3850         /*
3851          *      FIXME: Put this somewhere else, where it isn't called
3852          *      all of the time...
3853          */
3854
3855 #if !defined(HAVE_PTHREAD_H) && defined(WNOHANG)
3856         /*
3857          *      If there are no child threads, then there may
3858          *      be child processes.  In that case, wait for
3859          *      their exit status, and throw that exit status
3860          *      away.  This helps get rid of zxombie children.
3861          */
3862         while (waitpid(-1, &argval, WNOHANG) > 0) {
3863                 /* do nothing */
3864         }
3865 #endif
3866
3867 }
3868
3869 /*
3870  *      Externally-visibly functions.
3871  */
3872 int radius_event_init(CONF_SECTION *cs, int spawn_flag)
3873 {
3874         rad_listen_t *head = NULL;
3875
3876         if (el) return 0;
3877
3878         time(&fr_start_time);
3879
3880         el = fr_event_list_create(event_status);
3881         if (!el) return 0;
3882
3883         pl = fr_packet_list_create(0);
3884         if (!pl) return 0;      /* leak el */
3885
3886         request_num_counter = 0;
3887
3888 #ifdef WITH_PROXY
3889         if (mainconfig.proxy_requests) {
3890                 /*
3891                  *      Create the tree for managing proxied requests and
3892                  *      responses.
3893                  */
3894                 proxy_list = fr_packet_list_create(1);
3895                 if (!proxy_list) return 0;
3896
3897 #ifdef HAVE_PTHREAD_H
3898                 if (pthread_mutex_init(&proxy_mutex, NULL) != 0) {
3899                         radlog(L_ERR, "FATAL: Failed to initialize proxy mutex: %s",
3900                                strerror(errno));
3901                         exit(1);
3902                 }
3903 #endif
3904         }
3905 #endif
3906
3907         /*
3908          *      Just before we spawn the child threads, force the log
3909          *      subsystem to re-open the log file for every write.
3910          */
3911         if (spawn_flag) force_log_reopen();
3912
3913 #ifdef HAVE_PTHREAD_H
3914 #ifndef __MINGW32__
3915         NO_SUCH_CHILD_PID = (pthread_t ) (0);
3916 #else
3917         NO_SUCH_CHILD_PID = pthread_self(); /* not a child thread */
3918 #endif
3919         /*
3920          *      Initialize the threads ONLY if we're spawning, AND
3921          *      we're running normally.
3922          */
3923         if (spawn_flag && !check_config &&
3924             (thread_pool_init(cs, &spawn_flag) < 0)) {
3925                 exit(1);
3926         }
3927 #endif
3928
3929         /*
3930          *      Move all of the thread calls to this file?
3931          *
3932          *      It may be best for the mutexes to be in this file...
3933          */
3934         have_children = spawn_flag;
3935
3936         if (check_config) {
3937                 DEBUG("%s: #### Skipping IP addresses and Ports ####",
3938                        mainconfig.name);
3939                 return 1;
3940         }
3941
3942 #ifndef __MINGW32__
3943         /*
3944          *      Child threads need a pipe to signal us, as do the
3945          *      signal handlers.
3946          */
3947         if (pipe(self_pipe) < 0) {
3948                 radlog(L_ERR, "radiusd: Error opening internal pipe: %s",
3949                        strerror(errno));
3950                 exit(1);
3951         }
3952         if (fcntl(self_pipe[0], F_SETFL, O_NONBLOCK | FD_CLOEXEC) < 0) {
3953                 radlog(L_ERR, "radiusd: Error setting internal flags: %s",
3954                        strerror(errno));
3955                 exit(1);
3956         }
3957         if (fcntl(self_pipe[1], F_SETFL, O_NONBLOCK | FD_CLOEXEC) < 0) {
3958                 radlog(L_ERR, "radiusd: Error setting internal flags: %s",
3959                        strerror(errno));
3960                 exit(1);
3961         }
3962
3963         if (!fr_event_fd_insert(el, 0, self_pipe[0],
3964                                   event_signal_handler, el)) {
3965                 radlog(L_ERR, "Failed creating handler for signals");
3966                 exit(1);
3967         }
3968 #endif
3969
3970        DEBUG("%s: #### Opening IP addresses and Ports ####",
3971                mainconfig.name);
3972
3973        /*
3974         *       The server temporarily switches to an unprivileged
3975         *       user very early in the bootstrapping process.
3976         *       However, some sockets MAY require privileged access
3977         *       (bind to device, or to port < 1024, or to raw
3978         *       sockets).  Those sockets need to call suid up/down
3979         *       themselves around the functions that need a privileged
3980         *       uid.
3981         */
3982         if (listen_init(cs, &head) < 0) {
3983                 _exit(1);
3984         }
3985
3986         mainconfig.listen = head;
3987
3988         /*
3989          *      At this point, no one has any business *ever* going
3990          *      back to root uid.
3991          */
3992         fr_suid_down_permanent();
3993
3994         return 1;
3995 }
3996
3997
3998 static int request_hash_cb(UNUSED void *ctx, void *data)
3999 {
4000         REQUEST *request = fr_packet2myptr(REQUEST, packet, data);
4001
4002 #ifdef WITH_PROXY
4003         rad_assert(request->in_proxy_hash == FALSE);
4004 #endif
4005
4006         ev_request_free(&request);
4007
4008         return 0;
4009 }
4010
4011
4012 #ifdef WITH_PROXY
4013 static int proxy_hash_cb(UNUSED void *ctx, void *data)
4014 {
4015         REQUEST *request = fr_packet2myptr(REQUEST, proxy, data);
4016
4017         ev_request_free(&request);
4018
4019         return 0;
4020 }
4021 #endif
4022
4023 void radius_event_free(void)
4024 {
4025         /*
4026          *      FIXME: Stop all threads, or at least check that
4027          *      they're all waiting on the semaphore, and the queues
4028          *      are empty.
4029          */
4030
4031 #ifdef WITH_PROXY
4032         /*
4033          *      There are requests in the proxy hash that aren't
4034          *      referenced from anywhere else.  Remove them first.
4035          */
4036         if (proxy_list) {
4037                 fr_packet_list_walk(proxy_list, NULL, proxy_hash_cb);
4038                 fr_packet_list_free(proxy_list);
4039                 proxy_list = NULL;
4040         }
4041 #endif
4042
4043         fr_packet_list_walk(pl, NULL, request_hash_cb);
4044
4045         fr_packet_list_free(pl);
4046         pl = NULL;
4047
4048         fr_event_list_free(el);
4049 }
4050
4051 int radius_event_process(void)
4052 {
4053         if (!el) return 0;
4054
4055         return fr_event_loop(el);
4056 }
4057
4058 void radius_handle_request(REQUEST *request, RAD_REQUEST_FUNP fun)
4059 {
4060         request->options = RAD_REQUEST_OPTION_DEBUG2;
4061
4062         if (request_pre_handler(request)) {
4063                 rad_assert(fun != NULL);
4064                 rad_assert(request != NULL);
4065
4066                 if (request->server) RDEBUG("server %s {",
4067                                             request->server != NULL ?
4068                                             request->server : "");
4069                 fun(request);
4070
4071                 if (request->server) RDEBUG("} # server %s",
4072                                              request->server != NULL ?
4073                                             request->server : "");
4074
4075                 request_post_handler(request);
4076         }
4077
4078         DEBUG2("Going to the next request");
4079         return;
4080 }