src/main/event.c

   1 /*
   2  * event.c      Server event handling
   3  *
   4  * Version:     $Id$
   5  *
   6  *   This program is free software; you can redistribute it and/or modify
   7  *   it under the terms of the GNU General Public License as published by
   8  *   the Free Software Foundation; either version 2 of the License, or
   9  *   (at your option) any later version.
  10  *
  11  *   This program is distributed in the hope that it will be useful,
  12  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  *   GNU General Public License for more details.
  15  *
  16  *   You should have received a copy of the GNU General Public License
  17  *   along with this program; if not, write to the Free Software
  18  *   Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
  19  *
  20  * Copyright 2007  The FreeRADIUS server project
  21  * Copyright 2007  Alan DeKok <aland@deployingradius.com>
  22  */
  23
  24 #include <freeradius-devel/ident.h>
  25 RCSID("$Id$")
  26
  27 #include <freeradius-devel/radiusd.h>
  28 #include <freeradius-devel/modules.h>
  29 #include <freeradius-devel/event.h>
  30 #include <freeradius-devel/detail.h>
  31
  32 #include <freeradius-devel/rad_assert.h>
  33
  34 #include <signal.h>
  35 #include <fcntl.h>
  36
  37 #ifdef HAVE_SYS_WAIT_H
  38 #       include <sys/wait.h>
  39 #endif
  40
  41 #define USEC (1000000)
  42
  43 extern pid_t radius_pid;
  44 extern int dont_fork;
  45 extern int check_config;
  46 extern void force_log_reopen(void);
  47 extern char *debug_condition;
  48
  49 /*
  50  *      Ridiculous amounts of local state.
  51  */
  52 static fr_event_list_t  *el = NULL;
  53 static fr_packet_list_t *pl = NULL;
  54 static int                      request_num_counter = 0;
  55 static struct timeval           now;
  56 time_t                          fr_start_time;
  57 static int                      have_children;
  58 static int                      just_started = TRUE;
  59
  60 #ifndef __MINGW32__
  61 #ifdef HAVE_PTHREAD_H
  62 #define WITH_SELF_PIPE (1)
  63 #endif
  64 #endif
  65
  66 #ifdef WITH_SELF_PIPE
  67 static int self_pipe[2];
  68 #endif
  69
  70 #ifdef HAVE_PTHREAD_H
  71 #ifdef WITH_PROXY
  72 static pthread_mutex_t  proxy_mutex;
  73 #endif
  74
  75 #define PTHREAD_MUTEX_LOCK if (have_children) pthread_mutex_lock
  76 #define PTHREAD_MUTEX_UNLOCK if (have_children) pthread_mutex_unlock
  77
  78 static pthread_t NO_SUCH_CHILD_PID;
  79 #else
  80 /*
  81  *      This is easier than ifdef's throughout the code.
  82  */
  83 #define PTHREAD_MUTEX_LOCK(_x)
  84 #define PTHREAD_MUTEX_UNLOCK(_x)
  85 int thread_pool_addrequest(REQUEST *request, RAD_REQUEST_FUNP fun)
  86 {
  87         radius_handle_request(request, fun);
  88         return 1;
  89 }
  90 #endif
  91
  92 #define INSERT_EVENT(_function, _ctx) if (!fr_event_insert(el, _function, _ctx, &((_ctx)->when), &((_ctx)->ev))) { _rad_panic(__FILE__, __LINE__, "Failed to insert event"); }
  93
  94 #ifdef WITH_PROXY
  95 static fr_packet_list_t *proxy_list = NULL;
  96
  97 /*
  98  *      We keep the proxy FD's here.  The RADIUS Id's are marked
  99  *      "allocated" per Id, via a bit per proxy FD.
 100  */
 101 static int              proxy_fds[32];
 102 static rad_listen_t     *proxy_listeners[32];
 103 #else
 104 #define remove_from_proxy_hash(foo)
 105 #endif
 106
 107 static void request_post_handler(REQUEST *request);
 108 static void wait_a_bit(void *ctx);
 109 static void event_socket_handler(fr_event_list_t *xel, UNUSED int fd, void *ctx);
 110 #ifdef WITH_DETAIL
 111 static void event_poll_detail(void *ctx);
 112 #endif
 113
 114 static void NEVER_RETURNS _rad_panic(const char *file, unsigned int line,
 115                                     const char *msg)
 116 {
 117         radlog(L_ERR, "[%s:%d] %s", file, line, msg);
 118         _exit(1);
 119 }
 120
 121 #define rad_panic(x) _rad_panic(__FILE__, __LINE__, x)
 122
 123
 124 static void tv_add(struct timeval *tv, int usec_delay)
 125 {
 126         if (usec_delay > USEC) {
 127                 tv->tv_sec += usec_delay / USEC;
 128                 usec_delay %= USEC;
 129         }
 130         tv->tv_usec += usec_delay;
 131
 132         if (tv->tv_usec > USEC) {
 133                 tv->tv_usec -= USEC;
 134                 tv->tv_sec++;
 135         }
 136 }
 137
 138 static void remove_from_request_hash(REQUEST *request)
 139 {
 140         if (!request->in_request_hash) return;
 141
 142         fr_packet_list_yank(pl, request->packet);
 143         request->in_request_hash = FALSE;
 144
 145         request_stats_final(request);
 146 }
 147
 148
 149 #ifdef WITH_PROXY
 150 static REQUEST *lookup_in_proxy_hash(RADIUS_PACKET *reply)
 151 {
 152         RADIUS_PACKET **proxy_p;
 153         REQUEST *request;
 154
 155         PTHREAD_MUTEX_LOCK(&proxy_mutex);
 156         proxy_p = fr_packet_list_find_byreply(proxy_list, reply);
 157
 158         if (!proxy_p) {
 159                 PTHREAD_MUTEX_UNLOCK(&proxy_mutex);
 160                 return NULL;
 161         }
 162
 163         request = fr_packet2myptr(REQUEST, proxy, proxy_p);
 164
 165         if (!request) {
 166                 PTHREAD_MUTEX_UNLOCK(&proxy_mutex);
 167                 return NULL;
 168         }
 169
 170         request->num_proxied_responses++;
 171
 172         /*
 173          *      Catch the most common case of everything working
 174          *      correctly.
 175          */
 176         if (request->num_proxied_requests == request->num_proxied_responses) {
 177                 fr_packet_list_yank(proxy_list, request->proxy);
 178                 fr_packet_list_id_free(proxy_list, request->proxy);
 179                 request->in_proxy_hash = FALSE;
 180         }
 181
 182         /*
 183          *      On the FIRST reply, decrement the count of outstanding
 184          *      requests.  Note that this is NOT the count of sent
 185          *      packets, but whether or not the home server has
 186          *      responded at all.
 187          */
 188         if (!request->proxy_reply &&
 189             request->home_server &&
 190             request->home_server->currently_outstanding) {
 191                 request->home_server->currently_outstanding--;
 192         }
 193
 194         PTHREAD_MUTEX_UNLOCK(&proxy_mutex);
 195
 196         return request;
 197 }
 198
 199
 200 static void remove_from_proxy_hash(REQUEST *request)
 201 {
 202         /*
 203          *      Check this without grabbing the mutex because it's a
 204          *      lot faster that way.
 205          */
 206         if (!request->in_proxy_hash) return;
 207
 208         /*
 209          *      The "not in hash" flag is definitive.  However, if the
 210          *      flag says that it IS in the hash, there might still be
 211          *      a race condition where it isn't.
 212          */
 213         PTHREAD_MUTEX_LOCK(&proxy_mutex);
 214
 215         if (!request->in_proxy_hash) {
 216                 PTHREAD_MUTEX_UNLOCK(&proxy_mutex);
 217                 return;
 218         }
 219
 220         fr_packet_list_yank(proxy_list, request->proxy);
 221         fr_packet_list_id_free(proxy_list, request->proxy);
 222
 223         /*
 224          *      The home server hasn't replied, but we've given up on
 225          *      this request.  Don't count this request against the
 226          *      home server.
 227          */
 228         if (!request->proxy_reply &&
 229             request->home_server &&
 230             request->home_server->currently_outstanding) {
 231                 request->home_server->currently_outstanding--;
 232         }
 233
 234         /*
 235          *      Got from YES in hash, to NO, not in hash while we hold
 236          *      the mutex.  This guarantees that when another thread
 237          *      grans the mutex, the "not in hash" flag is correct.
 238          */
 239         request->in_proxy_hash = FALSE;
 240
 241         PTHREAD_MUTEX_UNLOCK(&proxy_mutex);
 242 }
 243
 244 static int proxy_id_alloc(REQUEST *request, RADIUS_PACKET *packet)
 245 {
 246         int i, proxy, found;
 247         rad_listen_t *proxy_listener;
 248
 249         if (fr_packet_list_id_alloc(proxy_list, packet)) return 1;
 250
 251         /*
 252          *      Allocate a new proxy fd.  This function adds
 253          *      it to the tail of the list of listeners.  With
 254          *      some care, this can be thread-safe.
 255          */
 256         proxy_listener = proxy_new_listener();
 257         if (!proxy_listener) {
 258                 RDEBUG2("ERROR: Failed to create a new socket for proxying requests.");
 259                 return 0;
 260         }
 261
 262         /*
 263          *      Cache it locally.
 264          */
 265         found = -1;
 266         proxy = proxy_listener->fd;
 267         for (i = 0; i < 32; i++) {
 268                 /*
 269                  *      Found a free entry.  Save the socket,
 270                  *      and remember where we saved it.
 271                  */
 272                 if (proxy_fds[(proxy + i) & 0x1f] == -1) {
 273                         found = (proxy + i) & 0x1f;
 274                         proxy_fds[found] = proxy;
 275                         proxy_listeners[found] = proxy_listener;
 276                         break;
 277                 }
 278         }
 279         rad_assert(found >= 0);
 280
 281         if (!fr_packet_list_socket_add(proxy_list, proxy_listener->fd)) {
 282                         RDEBUG2("ERROR: Failed to create a new socket for proxying requests.");
 283                 return 0;
 284
 285         }
 286
 287         if (!fr_packet_list_id_alloc(proxy_list, packet)) {
 288                         RDEBUG2("ERROR: Failed to create a new socket for proxying requests.");
 289                 return 0;
 290         }
 291
 292         /*
 293          *      Signal the main thread to add the new FD to the list
 294          *      of listening FD's.
 295          */
 296         radius_signal_self(RADIUS_SIGNAL_SELF_NEW_FD);
 297         return 1;
 298 }
 299
 300
 301 static int insert_into_proxy_hash(REQUEST *request, int retransmit)
 302 {
 303         int i, proxy;
 304         char buf[128];
 305
 306         rad_assert(request->proxy != NULL);
 307         rad_assert(proxy_list != NULL);
 308
 309         PTHREAD_MUTEX_LOCK(&proxy_mutex);
 310
 311         /*
 312          *      Keep track of maximum outstanding requests to a
 313          *      particular home server.  'max_outstanding' is
 314          *      enforced in home_server_ldb(), in realms.c.
 315          */
 316         if (request->home_server) {
 317                 request->home_server->currently_outstanding++;
 318                 request->home_server->stats.total_requests++;
 319         }
 320
 321         if (retransmit) {
 322                 RADIUS_PACKET packet;
 323
 324                 packet = *request->proxy;
 325
 326                 if (!proxy_id_alloc(request, &packet)) {
 327                         PTHREAD_MUTEX_UNLOCK(&proxy_mutex);
 328                         return 0;
 329                 }
 330
 331                 /*
 332                  *      Yank the request, free the old Id, and
 333                  *      remember the new Id.
 334                  */
 335                 fr_packet_list_yank(proxy_list, request->proxy);
 336                 fr_packet_list_id_free(proxy_list, request->proxy);
 337                 *request->proxy = packet;
 338
 339         } else if (!proxy_id_alloc(request, request->proxy)) {
 340                 PTHREAD_MUTEX_UNLOCK(&proxy_mutex);
 341                 return 0;
 342         }
 343
 344         rad_assert(request->proxy->sockfd >= 0);
 345
 346         /*
 347          *      FIXME: Hack until we get rid of rad_listen_t, and put
 348          *      the information into the packet_list.
 349          */
 350         proxy = -1;
 351         for (i = 0; i < 32; i++) {
 352                 if (proxy_fds[i] == request->proxy->sockfd) {
 353                         proxy = i;
 354                         break;
 355                 }
 356         }
 357
 358         if (proxy < 0) {
 359                 PTHREAD_MUTEX_UNLOCK(&proxy_mutex);
 360                 RDEBUG2("ERROR: All sockets are full.");
 361                 return 0;
 362         }
 363
 364         rad_assert(proxy_fds[proxy] != -1);
 365         rad_assert(proxy_listeners[proxy] != NULL);
 366         request->proxy_listener = proxy_listeners[proxy];
 367
 368         if (!fr_packet_list_insert(proxy_list, &request->proxy)) {
 369                 fr_packet_list_id_free(proxy_list, request->proxy);
 370                 PTHREAD_MUTEX_UNLOCK(&proxy_mutex);
 371                 RDEBUG2("ERROR: Failed to insert entry into proxy list");
 372                 return 0;
 373         }
 374
 375         request->in_proxy_hash = TRUE;
 376
 377         PTHREAD_MUTEX_UNLOCK(&proxy_mutex);
 378
 379         RDEBUG3(" proxy: allocating destination %s port %d - Id %d",
 380                inet_ntop(request->proxy->dst_ipaddr.af,
 381                          &request->proxy->dst_ipaddr.ipaddr, buf, sizeof(buf)),
 382                request->proxy->dst_port,
 383                request->proxy->id);
 384
 385         return 1;
 386 }
 387
 388
 389 /*
 390  *      Called as BOTH an event, and in-line from other functions.
 391  */
 392 static void wait_for_proxy_id_to_expire(void *ctx)
 393 {
 394         REQUEST *request = ctx;
 395
 396         rad_assert(request->magic == REQUEST_MAGIC);
 397         rad_assert(request->proxy != NULL);
 398
 399         if (!fr_event_now(el, &now)) gettimeofday(&now, NULL);
 400         request->when = request->proxy_when;
 401
 402 #ifdef WITH_COA
 403         if ((request->proxy->code == PW_COA_REQUEST) ||
 404             (request->proxy->code == PW_DISCONNECT_REQUEST)) {
 405                 request->when.tv_sec += request->home_server->coa_mrd;
 406         } else
 407 #endif
 408         request->when.tv_sec += request->home_server->response_window;
 409
 410         if ((request->num_proxied_requests == request->num_proxied_responses) ||
 411             timercmp(&now, &request->when, >)) {
 412                 if (request->packet) {
 413                         RDEBUG2("Cleaning up request %d ID %d with timestamp +%d",
 414                                request->number, request->packet->id,
 415                                (unsigned int) (request->timestamp - fr_start_time));
 416                 } else {
 417                         RDEBUG2("Cleaning up request %d with timestamp +%d",
 418                                request->number,
 419                                (unsigned int) (request->timestamp - fr_start_time));
 420                 }
 421
 422                 fr_event_delete(el, &request->ev);
 423                 remove_from_proxy_hash(request);
 424                 remove_from_request_hash(request);
 425                 request_free(&request);
 426                 return;
 427         }
 428
 429         INSERT_EVENT(wait_for_proxy_id_to_expire, request);
 430 }
 431 #endif
 432
 433 #ifdef HAVE_PTHREAD_H
 434 static void wait_for_child_to_die(void *ctx)
 435 {
 436         REQUEST *request = ctx;
 437
 438         rad_assert(request->magic == REQUEST_MAGIC);
 439
 440         if ((request->child_state == REQUEST_QUEUED) |
 441             (request->child_state == REQUEST_RUNNING)) {
 442                 request->delay += (request->delay >> 1);
 443                 tv_add(&request->when, request->delay);
 444
 445                 RDEBUG2("Child is still stuck for request %d", request->number);
 446
 447                 INSERT_EVENT(wait_for_child_to_die, request);
 448                 return;
 449         }
 450
 451         RDEBUG2("Child is finally responsive for request %d", request->number);
 452         remove_from_request_hash(request);
 453
 454 #ifdef WITH_PROXY
 455         if (request->proxy) {
 456                 wait_for_proxy_id_to_expire(request);
 457                 return;
 458         }
 459 #endif
 460
 461         request_free(&request);
 462 }
 463 #endif
 464
 465 static void cleanup_delay(void *ctx)
 466 {
 467         REQUEST *request = ctx;
 468
 469         rad_assert(request->magic == REQUEST_MAGIC);
 470         rad_assert((request->child_state == REQUEST_CLEANUP_DELAY) ||
 471                    (request->child_state == REQUEST_DONE));
 472
 473         remove_from_request_hash(request);
 474
 475 #ifdef WITH_PROXY
 476         if (request->proxy && request->in_proxy_hash) {
 477                 wait_for_proxy_id_to_expire(request);
 478                 return;
 479         }
 480 #endif
 481
 482         RDEBUG2("Cleaning up request %d ID %d with timestamp +%d",
 483                request->number, request->packet->id,
 484                (unsigned int) (request->timestamp - fr_start_time));
 485
 486         fr_event_delete(el, &request->ev);
 487         request_free(&request);
 488 }
 489
 490
 491 /*
 492  *      FIXME: Put into a libradius function.
 493  */
 494 #define MAX_PACKET_CODE (52)
 495 static const char *packet_codes[] = {
 496   "",
 497   "Access-Request",
 498   "Access-Accept",
 499   "Access-Reject",
 500   "Accounting-Request",
 501   "Accounting-Response",
 502   "Accounting-Status",
 503   "Password-Request",
 504   "Password-Accept",
 505   "Password-Reject",
 506   "Accounting-Message",
 507   "Access-Challenge",
 508   "Status-Server",
 509   "Status-Client",
 510   "14",
 511   "15",
 512   "16",
 513   "17",
 514   "18",
 515   "19",
 516   "20",
 517   "Resource-Free-Request",
 518   "Resource-Free-Response",
 519   "Resource-Query-Request",
 520   "Resource-Query-Response",
 521   "Alternate-Resource-Reclaim-Request",
 522   "NAS-Reboot-Request",
 523   "NAS-Reboot-Response",
 524   "28",
 525   "Next-Passcode",
 526   "New-Pin",
 527   "Terminate-Session",
 528   "Password-Expired",
 529   "Event-Request",
 530   "Event-Response",
 531   "35",
 532   "36",
 533   "37",
 534   "38",
 535   "39",
 536   "Disconnect-Request",
 537   "Disconnect-ACK",
 538   "Disconnect-NAK",
 539   "CoA-Request",
 540   "CoA-ACK",
 541   "CoA-NAK",
 542   "46",
 543   "47",
 544   "48",
 545   "49",
 546   "IP-Address-Allocate",
 547   "IP-Address-Release"
 548 };
 549
 550
 551 /*
 552  *      In daemon mode, AND this request has debug flags set.
 553  */
 554 #define DEBUG_PACKET if (!debug_flag && request->options && request->radlog) debug_packet
 555
 556 static void debug_packet(REQUEST *request, RADIUS_PACKET *packet, int direction)
 557 {
 558         VALUE_PAIR *vp;
 559         char buffer[1024];
 560         const char *received, *from;
 561         const fr_ipaddr_t *ip;
 562         int port;
 563
 564         if (!packet) return;
 565
 566         rad_assert(debug_flag != 0);
 567         rad_assert(request->radlog != NULL);
 568
 569         if (direction == 0) {
 570                 received = "Received";
 571                 from = "from";  /* what else? */
 572                 ip = &packet->src_ipaddr;
 573                 port = packet->src_port;
 574
 575         } else {
 576                 received = "Sending";
 577                 from = "to";    /* hah! */
 578                 ip = &packet->dst_ipaddr;
 579                 port = packet->dst_port;
 580         }
 581
 582         /*
 583          *      Client-specific debugging re-prints the input
 584          *      packet into the client log.
 585          *
 586          *      This really belongs in a utility library
 587          */
 588         if ((packet->code > 0) && (packet->code < MAX_PACKET_CODE)) {
 589                 RDEBUG("%s %s packet %s host %s port %d, id=%d, length=%d",
 590                        received, packet_codes[packet->code], from,
 591                        inet_ntop(ip->af, &ip->ipaddr, buffer, sizeof(buffer)),
 592                        port, packet->id, packet->data_len);
 593         } else {
 594                 RDEBUG("%s packet %s host %s port %d code=%d, id=%d, length=%d",
 595                        received, from,
 596                        inet_ntop(ip->af, &ip->ipaddr, buffer, sizeof(buffer)),
 597                        port,
 598                        packet->code, packet->id, packet->data_len);
 599         }
 600
 601         for (vp = packet->vps; vp != NULL; vp = vp->next) {
 602                 vp_prints(buffer, sizeof(buffer), vp);
 603                 request->radlog(L_DBG, 0, request, "\t%s", buffer);
 604         }
 605 }
 606
 607 static void reject_delay(void *ctx)
 608 {
 609         REQUEST *request = ctx;
 610
 611         rad_assert(request->magic == REQUEST_MAGIC);
 612         rad_assert(request->child_state == REQUEST_REJECT_DELAY);
 613
 614         RDEBUG2("Sending delayed reject for request %d", request->number);
 615
 616         DEBUG_PACKET(request, request->reply, 1);
 617
 618         request->listener->send(request->listener, request);
 619
 620         request->when.tv_sec += request->root->cleanup_delay;
 621         request->child_state = REQUEST_CLEANUP_DELAY;
 622
 623         INSERT_EVENT(cleanup_delay, request);
 624 }
 625
 626
 627 #ifdef WITH_PROXY
 628 void revive_home_server(void *ctx)
 629 {
 630         home_server *home = ctx;
 631         char buffer[128];
 632
 633         home->state = HOME_STATE_ALIVE;
 634         home->currently_outstanding = 0;
 635         home->revive_time = now;
 636
 637         /*
 638          *      Delete any outstanding events.
 639          */
 640         if (home->ev) fr_event_delete(el, &home->ev);
 641
 642         radlog(L_INFO, "PROXY: Marking home server %s port %d alive again... we have no idea if it really is alive or not.",
 643                inet_ntop(home->ipaddr.af, &home->ipaddr.ipaddr,
 644                          buffer, sizeof(buffer)),
 645                home->port);
 646
 647 }
 648
 649
 650 static void no_response_to_ping(void *ctx)
 651 {
 652         REQUEST *request = ctx;
 653         home_server *home;
 654         char buffer[128];
 655
 656         rad_assert(request->home_server != NULL);
 657
 658         home = request->home_server;
 659         home->num_received_pings = 0;
 660
 661         RDEBUG2("No response to status check %d from home server %s port %d",
 662                request->number,
 663                inet_ntop(request->proxy->dst_ipaddr.af,
 664                          &request->proxy->dst_ipaddr.ipaddr,
 665                          buffer, sizeof(buffer)),
 666                request->proxy->dst_port);
 667
 668         wait_for_proxy_id_to_expire(request);
 669 }
 670
 671
 672 static void received_response_to_ping(REQUEST *request)
 673 {
 674         home_server *home;
 675         char buffer[128];
 676
 677         rad_assert(request->home_server != NULL);
 678
 679         if (rad_verify(request->proxy_reply, request->proxy,
 680                        request->home_server->secret) != 0) {
 681                 DEBUG("Ignoring spoofed proxy reply.  Signature is invalid");
 682                 return;
 683         }
 684
 685         home = request->home_server;
 686         home->num_received_pings++;
 687
 688         RDEBUG2("Received response to status check %d (%d in current sequence)",
 689                request->number, home->num_received_pings);
 690
 691         /*
 692          *      Remove the request from any hashes
 693          */
 694         fr_event_delete(el, &request->ev);
 695         remove_from_proxy_hash(request);
 696         rad_assert(request->in_request_hash == FALSE);
 697
 698         /*
 699          *      The control socket may have marked the home server as
 700          *      alive.  OR, it may have suddenly started responding to
 701          *      requests again.  If so, don't re-do the "make alive"
 702          *      work.
 703          */
 704         if (home->state == HOME_STATE_ALIVE) return;
 705
 706         /*
 707          *      We haven't received enough ping responses to mark it
 708          *      "alive".  Wait a bit.
 709          */
 710         if (home->num_received_pings < home->num_pings_to_alive) {
 711                 return;
 712         }
 713
 714         home->state = HOME_STATE_ALIVE;
 715         home->currently_outstanding = 0;
 716         home->revive_time = now;
 717
 718         if (!fr_event_delete(el, &home->ev)) {
 719                 RDEBUG2("Hmm... no event for home server.  Oh well.");
 720         }
 721
 722         radlog(L_INFO, "PROXY: Marking home server %s port %d alive",
 723                inet_ntop(request->proxy->dst_ipaddr.af,
 724                          &request->proxy->dst_ipaddr.ipaddr,
 725                          buffer, sizeof(buffer)),
 726                request->proxy->dst_port);
 727 }
 728
 729
 730 /*
 731  *      Called from start of zombie period, OR after control socket
 732  *      marks the home server dead.
 733  */
 734 static void ping_home_server(void *ctx)
 735 {
 736         uint32_t jitter;
 737         home_server *home = ctx;
 738         REQUEST *request;
 739         VALUE_PAIR *vp;
 740
 741         if (home->state == HOME_STATE_ALIVE) {
 742                 radlog(L_INFO, "Suspicious proxy state... continuing");
 743                 return;
 744         }
 745
 746         request = request_alloc();
 747         request->number = request_num_counter++;
 748
 749         request->proxy = rad_alloc(1);
 750         rad_assert(request->proxy != NULL);
 751
 752         fr_event_now(el, &request->when);
 753         home->when = request->when;
 754
 755         if (home->ping_check == HOME_PING_CHECK_STATUS_SERVER) {
 756                 request->proxy->code = PW_STATUS_SERVER;
 757
 758                 radius_pairmake(request, &request->proxy->vps,
 759                                 "Message-Authenticator", "0x00", T_OP_SET);
 760
 761         } else if (home->type == HOME_TYPE_AUTH) {
 762                 request->proxy->code = PW_AUTHENTICATION_REQUEST;
 763
 764                 radius_pairmake(request, &request->proxy->vps,
 765                                 "User-Name", home->ping_user_name, T_OP_SET);
 766                 radius_pairmake(request, &request->proxy->vps,
 767                                 "User-Password", home->ping_user_password, T_OP_SET);
 768                 radius_pairmake(request, &request->proxy->vps,
 769                                 "Service-Type", "Authenticate-Only", T_OP_SET);
 770                 radius_pairmake(request, &request->proxy->vps,
 771                                 "Message-Authenticator", "0x00", T_OP_SET);
 772
 773         } else {
 774 #ifdef WITH_ACCOUNTING
 775                 request->proxy->code = PW_ACCOUNTING_REQUEST;
 776
 777                 radius_pairmake(request, &request->proxy->vps,
 778                                 "User-Name", home->ping_user_name, T_OP_SET);
 779                 radius_pairmake(request, &request->proxy->vps,
 780                                 "Acct-Status-Type", "Stop", T_OP_SET);
 781                 radius_pairmake(request, &request->proxy->vps,
 782                                 "Acct-Session-Id", "00000000", T_OP_SET);
 783                 vp = radius_pairmake(request, &request->proxy->vps,
 784                                      "Event-Timestamp", "0", T_OP_SET);
 785                 vp->vp_date = now.tv_sec;
 786 #else
 787                 rad_assert("Internal sanity check failed");
 788 #endif
 789         }
 790
 791         radius_pairmake(request, &request->proxy->vps,
 792                         "NAS-Identifier", "Status Check. Are you alive?",
 793                         T_OP_SET);
 794
 795         request->proxy->dst_ipaddr = home->ipaddr;
 796         request->proxy->dst_port = home->port;
 797         request->home_server = home;
 798
 799         rad_assert(request->proxy_listener == NULL);
 800
 801         if (!insert_into_proxy_hash(request, FALSE)) {
 802                 RDEBUG2("ERROR: Failed inserting status check %d into proxy hash.  Discarding it.",
 803                        request->number);
 804                 request_free(&request);
 805                 return;
 806         }
 807         rad_assert(request->proxy_listener != NULL);
 808         request->proxy_listener->send(request->proxy_listener,
 809                                       request);
 810
 811         request->next_callback = NULL;
 812         request->child_state = REQUEST_PROXIED;
 813         request->when.tv_sec += home->ping_timeout;;
 814
 815         INSERT_EVENT(no_response_to_ping, request);
 816
 817         /*
 818          *      Add +/- 2s of jitter, as suggested in RFC 3539
 819          *      and in the Issues and Fixes draft.
 820          */
 821         home->when.tv_sec += home->ping_interval - 2;
 822
 823         jitter = fr_rand();
 824         jitter ^= (jitter >> 10);
 825         jitter &= ((1 << 23) - 1); /* 22 bits of 1 */
 826
 827         tv_add(&home->when, jitter);
 828
 829         INSERT_EVENT(ping_home_server, home);
 830 }
 831
 832
 833 void mark_home_server_dead(home_server *home, struct timeval *when)
 834 {
 835         int previous_state = home->state;
 836         char buffer[128];
 837
 838         radlog(L_INFO, "PROXY: Marking home server %s port %d as dead.",
 839                inet_ntop(home->ipaddr.af, &home->ipaddr.ipaddr,
 840                          buffer, sizeof(buffer)),
 841                home->port);
 842
 843         home->state = HOME_STATE_IS_DEAD;
 844         home->num_received_pings = 0;
 845
 846         if (home->ping_check != HOME_PING_CHECK_NONE) {
 847                 /*
 848                  *      If the control socket marks us dead, start
 849                  *      pinging.  Otherwise, we already started
 850                  *      pinging when it was marked "zombie".
 851                  */
 852                 if (previous_state == HOME_STATE_ALIVE) {
 853                         ping_home_server(home);
 854                 }
 855
 856         } else {
 857                 /*
 858                  *      Revive it after a fixed period of time.  This
 859                  *      is very, very, bad.
 860                  */
 861                 home->when = *when;
 862                 home->when.tv_sec += home->revive_interval;
 863
 864                 INSERT_EVENT(revive_home_server, home);
 865         }
 866 }
 867
 868 static void check_for_zombie_home_server(REQUEST *request)
 869 {
 870         home_server *home;
 871         struct timeval when;
 872
 873         home = request->home_server;
 874
 875         if (home->state != HOME_STATE_ZOMBIE) return;
 876
 877         when = home->zombie_period_start;
 878         when.tv_sec += home->zombie_period;
 879
 880         fr_event_now(el, &now);
 881         if (timercmp(&now, &when, <)) {
 882                 return;
 883         }
 884
 885         mark_home_server_dead(home, &request->when);
 886 }
 887
 888 static int proxy_to_virtual_server(REQUEST *request);
 889
 890 static int virtual_server_handler(UNUSED REQUEST *request)
 891 {
 892         proxy_to_virtual_server(request);
 893         return 0;
 894 }
 895
 896 static void proxy_fallback_handler(REQUEST *request)
 897 {
 898         /*
 899          *      A proper time is required for wait_a_bit.
 900          */
 901         request->delay = USEC / 10;
 902         gettimeofday(&now, NULL);
 903         request->next_when = now;
 904         tv_add(&request->next_when, request->delay);
 905         request->next_callback = wait_a_bit;
 906
 907         /*
 908          *      Re-queue the request.
 909          */
 910         request->child_state = REQUEST_QUEUED;
 911
 912         rad_assert(request->proxy != NULL);
 913         if (!thread_pool_addrequest(request, virtual_server_handler)) {
 914                 request->child_state = REQUEST_DONE;
 915         }
 916
 917 #ifdef HAVE_PTHREAD_H
 918         /*
 919          *      MAY free the request if we're over max_request_time,
 920          *      AND we're not in threaded mode!
 921          *
 922          *      Note that we call this ONLY if we're threaded, as
 923          *      if we're NOT threaded, request_post_handler() calls
 924          *      wait_a_bit(), which means that "request" may not
 925          *      exist any more...
 926          */
 927         if (have_children) wait_a_bit(request);
 928 #endif
 929 }
 930
 931
 932 static int setup_post_proxy_fail(REQUEST *request)
 933 {
 934         DICT_VALUE *dval = NULL;
 935         VALUE_PAIR *vp;
 936
 937         if (request->packet->code == PW_AUTHENTICATION_REQUEST) {
 938                 dval = dict_valbyname(PW_POST_PROXY_TYPE, "Fail-Authentication");
 939
 940         } else if (request->packet->code == PW_ACCOUNTING_REQUEST) {
 941                 dval = dict_valbyname(PW_POST_PROXY_TYPE, "Fail-Accounting");
 942
 943 #ifdef WITH_COA
 944                 /*
 945                  *      See no_response_to_coa_request
 946                  */
 947         } else if (((request->packet->code >> 8) & 0xff) == PW_COA_REQUEST) {
 948                 request->packet->code &= 0xff; /* restore it */
 949
 950                 if (request->proxy->code == PW_COA_REQUEST) {
 951                         dval = dict_valbyname(PW_POST_PROXY_TYPE, "Fail-CoA");
 952
 953                 } else if (request->proxy->code == PW_DISCONNECT_REQUEST) {
 954                         dval = dict_valbyname(PW_POST_PROXY_TYPE, "Fail-Disconnect");
 955                 } else {
 956                         return 0;
 957                 }
 958
 959 #endif
 960         } else {
 961                 return 0;
 962         }
 963
 964         if (!dval) dval = dict_valbyname(PW_POST_PROXY_TYPE, "Fail");
 965
 966         if (!dval) {
 967                 pairdelete(&request->config_items, PW_POST_PROXY_TYPE);
 968                 return 0;
 969         }
 970
 971         vp = pairfind(request->config_items, PW_POST_PROXY_TYPE);
 972         if (!vp) vp = radius_paircreate(request, &request->config_items,
 973                                         PW_POST_PROXY_TYPE, PW_TYPE_INTEGER);
 974         vp->vp_integer = dval->value;
 975
 976         rad_assert(request->proxy_reply == NULL);
 977
 978         return 1;
 979 }
 980
 981
 982 static int null_handler(UNUSED REQUEST *request)
 983 {
 984         return 0;
 985 }
 986
 987 static void post_proxy_fail_handler(REQUEST *request)
 988 {
 989         /*
 990          *      A proper time is required for wait_a_bit.
 991          */
 992         request->delay = USEC / 10;
 993         gettimeofday(&now, NULL);
 994
 995         /*
 996          *      Not set up to run Post-Proxy-Type = Fail.
 997          *
 998          *      Mark the request as still running, and figure out what
 999          *      to do next.
1000          */
1001         if (!setup_post_proxy_fail(request)) {
1002                 request->child_state = REQUEST_RUNNING;
1003                 request_post_handler(request);
1004
1005         } else {
1006                 /*
1007                  *      Re-queue the request.
1008                  */
1009                 request->child_state = REQUEST_QUEUED;
1010
1011                 /*
1012                  *      There is a post-proxy-type of fail.  We run
1013                  *      the request through the pre/post proxy
1014                  *      handlers, just like it was a real proxied
1015                  *      request.  However, we set the per-request
1016                  *      handler to NULL, as we don't want to do
1017                  *      anything else.
1018                  *
1019                  *      Note that when we're not threaded, this will
1020                  *      process the request even if it's greater than
1021                  *      max_request_time.  That's not fatal.
1022                  */
1023                 request->priority = 0;
1024                 rad_assert(request->proxy != NULL);
1025                 thread_pool_addrequest(request, null_handler);
1026         }
1027
1028         /*
1029          *      MAY free the request if we're over max_request_time,
1030          *      AND we're not in threaded mode!
1031          *
1032          *      Note that we call this ONLY if we're threaded, as
1033          *      if we're NOT threaded, request_post_handler() calls
1034          *      wait_a_bit(), which means that "request" may not
1035          *      exist any more...
1036          */
1037         if (have_children) wait_a_bit(request);
1038 }
1039
1040
1041 /* maybe check this against wait_for_proxy_id_to_expire? */
1042 static void no_response_to_proxied_request(void *ctx)
1043 {
1044         REQUEST *request = ctx;
1045         home_server *home;
1046         char buffer[128];
1047
1048         rad_assert(request->magic == REQUEST_MAGIC);
1049         rad_assert(request->child_state == REQUEST_PROXIED);
1050
1051         /*
1052          *      If we've failed over to an internal home server,
1053          *      replace the callback with the correct one.  This
1054          *      is due to locking issues with child threads...
1055          */
1056         if (request->home_server->server) {
1057                 wait_a_bit(request);
1058                 return;
1059         }
1060
1061         radlog(L_ERR, "Rejecting request %d due to lack of any response from home server %s port %d",
1062                request->number,
1063                inet_ntop(request->proxy->dst_ipaddr.af,
1064                          &request->proxy->dst_ipaddr.ipaddr,
1065                          buffer, sizeof(buffer)),
1066                request->proxy->dst_port);
1067
1068         check_for_zombie_home_server(request);
1069
1070         home = request->home_server;
1071
1072         post_proxy_fail_handler(request);
1073
1074         /*
1075          *      Don't touch request due to race conditions
1076          */
1077         if (home->state == HOME_STATE_IS_DEAD) {
1078                 rad_assert(home->ev != NULL); /* or it will never wake up */
1079                 return;
1080         }
1081
1082         /*
1083          *      Enable the zombie period when we notice that the home
1084          *      server hasn't responded.  We do NOT back-date the start
1085          *      of the zombie period.
1086          */
1087         if (home->state == HOME_STATE_ALIVE) {
1088                 radlog(L_ERR, "PROXY: Marking home server %s port %d as zombie (it looks like it is dead).",
1089                        inet_ntop(home->ipaddr.af, &home->ipaddr.ipaddr,
1090                                  buffer, sizeof(buffer)),
1091                        home->port);
1092                 home->state = HOME_STATE_ZOMBIE;
1093                 home->zombie_period_start = now;
1094
1095                 /*
1096                  *      Start pinging the home server.
1097                  */
1098                 ping_home_server(home);
1099         }
1100 }
1101 #endif
1102
1103 static void wait_a_bit(void *ctx)
1104 {
1105         struct timeval when;
1106         REQUEST *request = ctx;
1107         fr_event_callback_t callback = NULL;
1108
1109         rad_assert(request->magic == REQUEST_MAGIC);
1110
1111 #ifdef WITH_COA
1112         /*
1113          *      The CoA request is a new (internally generated)
1114          *      request, created in a child thread.  We therefore need
1115          *      some way to tie its events back into the main event
1116          *      handler.
1117          */
1118         if (request->coa && !request->coa->proxy_reply &&
1119             request->coa->next_callback) {
1120                 request->coa->when = request->coa->next_when;
1121                 INSERT_EVENT(request->coa->next_callback, request->coa);
1122                 request->coa->next_callback = NULL;
1123                 request->coa->parent = NULL;
1124                 request->coa = NULL;
1125         }
1126 #endif
1127
1128         switch (request->child_state) {
1129         case REQUEST_QUEUED:
1130         case REQUEST_RUNNING:
1131                 when = request->received;
1132                 when.tv_sec += request->root->max_request_time;
1133
1134                 /*
1135                  *      Normally called from the event loop with the
1136                  *      proper event loop time.  Otherwise, called from
1137                  *      post proxy fail handler, which sets "now", and
1138                  *      this call won't re-set it, because we're not
1139                  *      in the event loop.
1140                  */
1141                 fr_event_now(el, &now);
1142
1143                 /*
1144                  *      Request still has more time.  Continue
1145                  *      waiting.
1146                  */
1147                 if (timercmp(&now, &when, <) ||
1148                     ((request->listener->type == RAD_LISTEN_DETAIL) &&
1149                      (request->child_state == REQUEST_QUEUED))) {
1150                         if (request->delay < (USEC / 10)) {
1151                                 request->delay = USEC / 10;
1152                         }
1153                         request->delay += request->delay >> 1;
1154
1155 #ifdef WITH_DETAIL
1156                         /*
1157                          *      Cap wait at some sane value for detail
1158                          *      files.
1159                          */
1160                         if ((request->listener->type == RAD_LISTEN_DETAIL) &&
1161                             (request->delay > (request->root->max_request_time * USEC))) {
1162                                 request->delay = request->root->max_request_time * USEC;
1163                         }
1164 #endif
1165
1166                         request->when = now;
1167                         tv_add(&request->when, request->delay);
1168                         callback = wait_a_bit;
1169                         break;
1170                 }
1171
1172 #if defined(HAVE_PTHREAD_H)
1173                 /*
1174                  *      A child thread MAY still be running on the
1175                  *      request.  Ask the thread to stop working on
1176                  *      the request.
1177                  */
1178                 if (have_children) {
1179                         /* FIXME: kill unresponsive children? */
1180
1181                         /*
1182                          *      Print this error message ONLY if
1183                          *      there's a child currently processing
1184                          *      the request.  As we don't have thread
1185                          *      locks here, there may be race
1186                          *      conditions on this check.  But it's
1187                          *      just an error message, so that's OK.
1188                          */
1189                         if (!pthread_equal(request->child_pid, NO_SUCH_CHILD_PID)) {
1190                                 radlog(L_ERR, "WARNING: Unresponsive child for request %d, in module %s component %s",
1191                                        request->number,
1192                                        request->module ? request->module : "<server core>",
1193                                        request->component ? request->component : "<server core>");
1194                         }
1195
1196                         request->master_state = REQUEST_STOP_PROCESSING;
1197
1198                         request->delay = USEC / 4;
1199                         tv_add(&request->when, request->delay);
1200                         callback = wait_for_child_to_die;
1201                         break;
1202                 }
1203 #endif
1204
1205                 /*
1206                  *      Else there are no child threads.  We probably
1207                  *      should have just marked the request as 'done'
1208                  *      elsewhere, like in the post-proxy-fail
1209                  *      handler.  But doing that would involve
1210                  *      checking for max_request_time in multiple
1211                  *      places, so this may be simplest.
1212                  */
1213                 request->child_state = REQUEST_DONE;
1214                 /* FALL-THROUGH */
1215
1216                 /*
1217                  *      Mark the request as no longer running,
1218                  *      and clean it up.
1219                  */
1220         case REQUEST_DONE:
1221 #ifdef HAVE_PTHREAD_H
1222                 request->child_pid = NO_SUCH_CHILD_PID;
1223 #endif
1224
1225 #ifdef WTH_COA
1226                 /*
1227                  *      This is a CoA request.  It's been divorced
1228                  *      from everything else, so we clean it up now.
1229                  */
1230                 if (!request->in_request_hash &&
1231                     request->proxy &&
1232                     (request->packet->code != request->proxy->code) &&
1233                     ((request->proxy->code == PW_COA_REQUEST) ||
1234                      (request->proxy->code == PW_DISCONNECT_REQUEST))) {
1235                         /*
1236                          *      FIXME: Do CoA MIBs
1237                          */
1238                         fr_event_delete(el, &request->ev);
1239                         remove_from_proxy_hash(request);
1240                         request_free(&request);
1241                         return;
1242                 }
1243 #endif
1244                 request_stats_final(request);
1245                 cleanup_delay(request);
1246                 return;
1247
1248         case REQUEST_REJECT_DELAY:
1249         case REQUEST_CLEANUP_DELAY:
1250 #ifdef HAVE_PTHREAD_H
1251                 request->child_pid = NO_SUCH_CHILD_PID;
1252 #endif
1253                 request_stats_final(request);
1254
1255         case REQUEST_PROXIED:
1256                 rad_assert(request->next_callback != NULL);
1257                 rad_assert(request->next_callback != wait_a_bit);
1258
1259                 request->when = request->next_when;
1260                 callback = request->next_callback;
1261                 request->next_callback = NULL;
1262                 break;
1263
1264         default:
1265                 rad_panic("Internal sanity check failure");
1266                 return;
1267         }
1268
1269         /*
1270          *      Something major went wrong.  Discard the request, and
1271          *      keep running.
1272          *
1273          *      FIXME: No idea why this happens or how to fix it...
1274          *      It seems to happen *only* when requests are proxied,
1275          *      and where the home server doesn't respond.  So it looks
1276          *      like a race condition above, but it happens in debug
1277          *      mode, with no threads...
1278          */
1279         if (!callback) {
1280                 RDEBUG("WARNING: Internal sanity check failed in event handler for request %d: Discarding the request!", request->number);
1281                 fr_event_delete(el, &request->ev);
1282                 remove_from_proxy_hash(request);
1283                 remove_from_request_hash(request);
1284                 request_free(&request);
1285                 return;
1286         }
1287
1288         INSERT_EVENT(callback, request);
1289 }
1290
1291 #ifdef WITH_COA
1292 static void no_response_to_coa_request(void *ctx)
1293 {
1294         REQUEST *request = ctx;
1295         char buffer[128];
1296
1297         rad_assert(request->magic == REQUEST_MAGIC);
1298         rad_assert(request->child_state == REQUEST_PROXIED);
1299         rad_assert(request->home_server != NULL);
1300         rad_assert(!request->in_request_hash);
1301
1302         radlog(L_ERR, "No response to CoA request sent to %s",
1303                inet_ntop(request->proxy->dst_ipaddr.af,
1304                          &request->proxy->dst_ipaddr.ipaddr,
1305                          buffer, sizeof(buffer)));
1306
1307         /*
1308          *      Hack.
1309          */
1310         request->packet->code |= (PW_COA_REQUEST << 8);
1311         post_proxy_fail_handler(request);
1312 }
1313
1314
1315 static int update_event_timestamp(RADIUS_PACKET *packet, time_t when)
1316 {
1317         VALUE_PAIR *vp;
1318
1319         vp = pairfind(packet->vps, PW_EVENT_TIMESTAMP);
1320         if (!vp) return 0;
1321
1322         vp->vp_date = when;
1323
1324         if (packet->data) {
1325                 free(packet->data);
1326                 packet->data = NULL;
1327                 packet->data_len = 0;
1328         }
1329
1330         return 1;               /* time stamp updated */
1331 }
1332
1333
1334 /*
1335  *      Called when we haven't received a response to a CoA request.
1336  */
1337 static void retransmit_coa_request(void *ctx)
1338 {
1339         int delay, frac;
1340         struct timeval mrd;
1341         REQUEST *request = ctx;
1342
1343         rad_assert(request->magic == REQUEST_MAGIC);
1344         rad_assert(request->child_state == REQUEST_PROXIED);
1345         rad_assert(request->home_server != NULL);
1346         rad_assert(!request->in_request_hash);
1347         rad_assert(request->parent == NULL);
1348
1349         fr_event_now(el, &now);
1350
1351         /*
1352          *      Cap count at MRC, if it is non-zero.
1353          */
1354         if (request->home_server->coa_mrc &&
1355             (request->num_coa_requests >= request->home_server->coa_mrc)) {
1356                 no_response_to_coa_request(request);
1357                 return;
1358         }
1359
1360         /*
1361          *      RFC 5080 Section 2.2.1
1362          *
1363          *      RT = 2*RTprev + RAND*RTprev
1364          *         = 1.9 * RTprev + rand(0,.2) * RTprev
1365          *         = 1.9 * RTprev + rand(0,1) * (RTprev / 5)
1366          */
1367         delay = fr_rand();
1368         delay ^= (delay >> 16);
1369         delay &= 0xffff;
1370         frac = request->delay / 5;
1371         delay = ((frac >> 16) * delay) + (((frac & 0xffff) * delay) >> 16);
1372
1373         delay += (2 * request->delay) - (request->delay / 10);
1374
1375         /*
1376          *      Cap delay at MRT, if MRT is non-zero.
1377          */
1378         if (request->home_server->coa_mrt &&
1379             (delay > (request->home_server->coa_mrt * USEC))) {
1380                 int mrt_usec = request->home_server->coa_mrt * USEC;
1381
1382                 /*
1383                  *      delay = MRT + RAND * MRT
1384                  *            = 0.9 MRT + rand(0,.2)  * MRT
1385                  */
1386                 delay = fr_rand();
1387                 delay ^= (delay >> 15);
1388                 delay &= 0x1ffff;
1389                 delay = ((mrt_usec >> 16) * delay) + (((mrt_usec & 0xffff) * delay) >> 16);
1390                 delay += mrt_usec - (mrt_usec / 10);
1391         }
1392
1393         request->delay = delay;
1394         request->when = now;
1395         tv_add(&request->when, request->delay);
1396         mrd = request->proxy_when;
1397         mrd.tv_sec += request->home_server->coa_mrd;
1398
1399         /*
1400          *      Cap duration at MRD.
1401          */
1402         if (timercmp(&mrd, &request->when, <)) {
1403                 request->when = mrd;
1404                 INSERT_EVENT(no_response_to_coa_request, request);
1405
1406         } else {
1407                 INSERT_EVENT(retransmit_coa_request, request);
1408         }
1409
1410         if (update_event_timestamp(request->proxy, now.tv_sec)) {
1411                 if (!insert_into_proxy_hash(request, TRUE)) {
1412                         DEBUG("ERROR: Failed re-inserting CoA request into proxy hash.");
1413                         return;
1414                 }
1415
1416                 request->num_proxied_requests = 0;
1417                 request->num_proxied_responses = 0;
1418         }
1419
1420         request->num_proxied_requests++;
1421         request->num_coa_requests++; /* is NOT reset by code 3 lines above! */
1422
1423         request->proxy_listener->send(request->proxy_listener,
1424                                       request);
1425 }
1426
1427
1428 /*
1429  *      The original request is either DONE, or in CLEANUP_DELAY.
1430  */
1431 static int originated_coa_request(REQUEST *request)
1432 {
1433         int delay, rcode, pre_proxy_type = 0;
1434         VALUE_PAIR *vp;
1435         REQUEST *coa;
1436         fr_ipaddr_t ipaddr;
1437         char buffer[256];
1438
1439         rad_assert(request->proxy == NULL);
1440         rad_assert(!request->in_proxy_hash);
1441         rad_assert(request->proxy_reply == NULL);
1442
1443         vp = pairfind(request->config_items, PW_SEND_COA_REQUEST);
1444         if (!vp && request->coa) vp = pairfind(request->coa->proxy->vps, PW_SEND_COA_REQUEST);
1445         if (vp) {
1446                 if (vp->vp_integer == 0) {
1447                         request_free(&request->coa);
1448                         return 1;       /* success */
1449                 }
1450
1451                 if (!request->coa) request_alloc_coa(request);
1452                 if (!request->coa) return 0;
1453         }
1454
1455         coa = request->coa;
1456
1457         /*
1458          *      src_ipaddr will be set up in proxy_encode.
1459          */
1460         memset(&ipaddr, 0, sizeof(ipaddr));
1461         vp = pairfind(coa->proxy->vps, PW_PACKET_DST_IP_ADDRESS);
1462         if (vp) {
1463                 ipaddr.af = AF_INET;
1464                 ipaddr.ipaddr.ip4addr.s_addr = vp->vp_ipaddr;
1465
1466         } else if ((vp = pairfind(coa->proxy->vps,
1467                                   PW_PACKET_DST_IPV6_ADDRESS)) != NULL) {
1468                 ipaddr.af = AF_INET6;
1469                 ipaddr.ipaddr.ip6addr = vp->vp_ipv6addr;
1470
1471         } else if ((vp = pairfind(coa->proxy->vps,
1472                                   PW_HOME_SERVER_POOL)) != NULL) {
1473                 coa->home_pool = home_pool_byname(vp->vp_strvalue,
1474                                                   HOME_TYPE_COA);
1475                 if (!coa->home_pool) {
1476                         RDEBUG2("WARNING: No such home_server_pool %s",
1477                                vp->vp_strvalue);
1478         fail:
1479                         request_free(&request->coa);
1480                         return 0;
1481                 }
1482
1483                 /*
1484                  *      Prefer
1485                  */
1486         } else if (request->client->coa_pool) {
1487                 coa->home_pool = request->client->coa_pool;
1488
1489         } else if (request->client->coa_server) {
1490                 coa->home_server = request->client->coa_server;
1491
1492         } else {
1493                 /*
1494                  *      If all else fails, send it to the client that
1495                  *      originated this request.
1496                  */
1497                 memcpy(&ipaddr, &request->packet->src_ipaddr, sizeof(ipaddr));
1498         }
1499
1500         /*
1501          *      Use the pool, if it exists.
1502          */
1503         if (coa->home_pool) {
1504                 coa->home_server = home_server_ldb(NULL, coa->home_pool, coa);
1505                 if (!coa->home_server) {
1506                         RDEBUG("WARNING: No live home server for home_server_pool %s", vp->vp_strvalue);
1507                         goto fail;
1508                 }
1509
1510         } else if (!coa->home_server) {
1511                 int port = PW_COA_UDP_PORT;
1512
1513                 vp = pairfind(coa->proxy->vps, PW_PACKET_DST_PORT);
1514                 if (vp) port = vp->vp_integer;
1515
1516                 coa->home_server = home_server_find(&ipaddr, port);
1517                 if (!coa->home_server) {
1518                         RDEBUG2("WARNING: Unknown destination %s:%d for CoA request.",
1519                                inet_ntop(ipaddr.af, &ipaddr.ipaddr,
1520                                          buffer, sizeof(buffer)), port);
1521                         goto fail;
1522                 }
1523         }
1524
1525         vp = pairfind(coa->proxy->vps, PW_PACKET_TYPE);
1526         if (vp) {
1527                 switch (vp->vp_integer) {
1528                 case PW_COA_REQUEST:
1529                 case PW_DISCONNECT_REQUEST:
1530                         coa->proxy->code = vp->vp_integer;
1531                         break;
1532
1533                 default:
1534                         DEBUG("Cannot set CoA Packet-Type to code %d",
1535                               vp->vp_integer);
1536                         goto fail;
1537                 }
1538         }
1539
1540         if (!coa->proxy->code) coa->proxy->code = PW_COA_REQUEST;
1541
1542         /*
1543          *      The rest of the server code assumes that
1544          *      request->packet && request->reply exist.  Copy them
1545          *      from the original request.
1546          */
1547         rad_assert(coa->packet != NULL);
1548         rad_assert(coa->packet->vps == NULL);
1549         memcpy(coa->packet, request->packet, sizeof(*request->packet));
1550         coa->packet->vps = paircopy(request->packet->vps);
1551         coa->packet->data = NULL;
1552         rad_assert(coa->reply != NULL);
1553         rad_assert(coa->reply->vps == NULL);
1554         memcpy(coa->reply, request->reply, sizeof(*request->reply));
1555         coa->reply->vps = paircopy(request->reply->vps);
1556         coa->reply->data = NULL;
1557         coa->config_items = paircopy(request->config_items);
1558
1559         /*
1560          *      Call the pre-proxy routines.
1561          */
1562         vp = pairfind(request->config_items, PW_PRE_PROXY_TYPE);
1563         if (vp) {
1564                 RDEBUG2("  Found Pre-Proxy-Type %s", vp->vp_strvalue);
1565                 pre_proxy_type = vp->vp_integer;
1566         }
1567
1568         if (coa->home_pool && coa->home_pool->virtual_server) {
1569                 const char *old_server = coa->server;
1570
1571                 coa->server = coa->home_pool->virtual_server;
1572                 RDEBUG2(" server %s {", coa->server);
1573                 rcode = module_pre_proxy(pre_proxy_type, coa);
1574                 RDEBUG2(" }");
1575                 coa->server = old_server;
1576         } else {
1577                 rcode = module_pre_proxy(pre_proxy_type, coa);
1578         }
1579         switch (rcode) {
1580         default:
1581                 goto fail;
1582
1583         /*
1584          *      Only send the CoA packet if the pre-proxy code succeeded.
1585          */
1586         case RLM_MODULE_NOOP:
1587         case RLM_MODULE_OK:
1588         case RLM_MODULE_UPDATED:
1589                 break;
1590         }
1591
1592         /*
1593          *      Source IP / port is set when the proxy socket
1594          *      is chosen.
1595          */
1596         coa->proxy->dst_ipaddr = coa->home_server->ipaddr;
1597         coa->proxy->dst_port = coa->home_server->port;
1598
1599         if (!insert_into_proxy_hash(coa, FALSE)) {
1600                 DEBUG("ERROR: Failed inserting CoA request into proxy hash.");
1601                 goto fail;
1602         }
1603
1604         /*
1605          *      We CANNOT divorce the CoA request from the parent
1606          *      request.  This function is running in a child thread,
1607          *      and we need access to the main event loop in order to
1608          *      to add the timers for the CoA packet.  See
1609          *      wait_a_bit().
1610          */
1611
1612         /*
1613          *      Forget about the original request completely at this
1614          *      point.
1615          */
1616         request = coa;
1617
1618         gettimeofday(&request->proxy_when, NULL);
1619         request->received = request->next_when = request->proxy_when;
1620         rad_assert(request->proxy_reply == NULL);
1621
1622         /*
1623          *      Implement re-transmit algorithm as per RFC 5080
1624          *      Section 2.2.1.
1625          *
1626          *      We want IRT + RAND*IRT
1627          *      or 0.9 IRT + rand(0,.2) IRT
1628          *
1629          *      2^20 ~ USEC, and we want 2.
1630          *      rand(0,0.2) USEC ~ (rand(0,2^21) / 10)
1631          */
1632         delay = (fr_rand() & ((1 << 22) - 1)) / 10;
1633         request->delay = delay * request->home_server->coa_irt;
1634         delay = request->home_server->coa_irt * USEC;
1635         delay -= delay / 10;
1636         delay += request->delay;
1637
1638         request->delay = delay;
1639         tv_add(&request->next_when, delay);
1640         request->next_callback = retransmit_coa_request;
1641
1642         /*
1643          *      Note that we set proxied BEFORE sending the packet.
1644          *
1645          *      Once we send it, the request is tainted, as
1646          *      another thread may have picked it up.  Don't
1647          *      touch it!
1648          */
1649         request->num_proxied_requests = 1;
1650         request->num_proxied_responses = 0;
1651         request->child_pid = NO_SUCH_CHILD_PID;
1652
1653         update_event_timestamp(request->proxy, request->proxy_when.tv_sec);
1654
1655         request->child_state = REQUEST_PROXIED;
1656
1657         DEBUG_PACKET(request, request->proxy, 1);
1658
1659         request->proxy_listener->send(request->proxy_listener,
1660                                       request);
1661         return 1;
1662 }
1663 #endif  /* WITH_COA */
1664
1665 #ifdef WITH_PROXY
1666 static int process_proxy_reply(REQUEST *request)
1667 {
1668         int rcode;
1669         int post_proxy_type = 0;
1670         VALUE_PAIR *vp;
1671
1672         /*
1673          *      Delete any reply we had accumulated until now.
1674          */
1675         pairfree(&request->reply->vps);
1676
1677         /*
1678          *      Run the packet through the post-proxy stage,
1679          *      BEFORE playing games with the attributes.
1680          */
1681         vp = pairfind(request->config_items, PW_POST_PROXY_TYPE);
1682         if (vp) {
1683                 RDEBUG2("  Found Post-Proxy-Type %s", vp->vp_strvalue);
1684                 post_proxy_type = vp->vp_integer;
1685         }
1686
1687         if (request->home_pool && request->home_pool->virtual_server) {
1688                 const char *old_server = request->server;
1689
1690                 request->server = request->home_pool->virtual_server;
1691                 RDEBUG2(" server %s {", request->server);
1692                 rcode = module_post_proxy(post_proxy_type, request);
1693                 RDEBUG2(" }");
1694                 request->server = old_server;
1695         } else {
1696                 rcode = module_post_proxy(post_proxy_type, request);
1697         }
1698
1699 #ifdef WITH_COA
1700         if (request->packet->code == request->proxy->code)
1701           /*
1702            *    Don't run the next bit if we originated a CoA
1703            *    packet, after receiving an Access-Request or
1704            *    Accounting-Request.
1705            */
1706 #endif
1707
1708         /*
1709          *      There may NOT be a proxy reply, as we may be
1710          *      running Post-Proxy-Type = Fail.
1711          */
1712         if (request->proxy_reply) {
1713                 /*
1714                  *      Delete the Proxy-State Attributes from
1715                  *      the reply.  These include Proxy-State
1716                  *      attributes from us and remote server.
1717                  */
1718                 pairdelete(&request->proxy_reply->vps, PW_PROXY_STATE);
1719
1720                 /*
1721                  *      Add the attributes left in the proxy
1722                  *      reply to the reply list.
1723                  */
1724                 pairadd(&request->reply->vps, request->proxy_reply->vps);
1725                 request->proxy_reply->vps = NULL;
1726
1727                 /*
1728                  *      Free proxy request pairs.
1729                  */
1730                 pairfree(&request->proxy->vps);
1731         }
1732
1733         switch (rcode) {
1734         default:  /* Don't do anything */
1735                 break;
1736         case RLM_MODULE_FAIL:
1737                 /* FIXME: debug print stuff */
1738                 request->child_state = REQUEST_DONE;
1739                 return 0;
1740
1741         case RLM_MODULE_HANDLED:
1742                 /* FIXME: debug print stuff */
1743                 request->child_state = REQUEST_DONE;
1744                 return 0;
1745         }
1746
1747         return 1;
1748 }
1749 #endif
1750
1751 static int request_pre_handler(REQUEST *request)
1752 {
1753         int rcode;
1754
1755         rad_assert(request->magic == REQUEST_MAGIC);
1756         rad_assert(request->packet != NULL);
1757
1758         request->child_state = REQUEST_RUNNING;
1759
1760         /*
1761          *      Don't decode the packet if it's an internal "fake"
1762          *      request.  Instead, just return so that the caller can
1763          *      process it.
1764          */
1765         if (request->packet->dst_port == 0) {
1766                 request->username = pairfind(request->packet->vps,
1767                                              PW_USER_NAME);
1768                 request->password = pairfind(request->packet->vps,
1769                                              PW_USER_PASSWORD);
1770                 return 1;
1771         }
1772
1773 #ifdef WITH_PROXY
1774         /*
1775          *      Put the decoded packet into it's proper place.
1776          */
1777         if (request->proxy_reply != NULL) {
1778                 rcode = request->proxy_listener->decode(request->proxy_listener,
1779                                                         request);
1780                 DEBUG_PACKET(request, request->proxy_reply, 0);
1781         } else
1782 #endif
1783         if (request->packet->vps == NULL) {
1784                 rcode = request->listener->decode(request->listener, request);
1785
1786                 if (debug_condition) {
1787                         int result = FALSE;
1788                         const char *my_debug = debug_condition;
1789
1790                         /*
1791                          *      Ignore parse errors.
1792                          */
1793                         radius_evaluate_condition(request, RLM_MODULE_OK, 0,
1794                                                   &my_debug, 1,
1795                                                   &result);
1796                         if (result) {
1797                                 request->options = 2;
1798                                 request->radlog = radlog_request;
1799                         }
1800                 }
1801
1802                 DEBUG_PACKET(request, request->packet, 0);
1803         } else {
1804                 rcode = 0;
1805         }
1806
1807         if (rcode < 0) {
1808                 radlog(L_ERR, "%s Dropping packet without response.", fr_strerror());
1809                 request->child_state = REQUEST_DONE;
1810                 return 0;
1811         }
1812
1813         if (!request->username) {
1814                 request->username = pairfind(request->packet->vps,
1815                                              PW_USER_NAME);
1816         }
1817
1818 #ifdef WITH_PROXY
1819         if (request->proxy) {
1820                 return process_proxy_reply(request);
1821 #endif
1822         }
1823
1824         return 1;
1825 }
1826
1827
1828 #ifdef WITH_PROXY
1829 /*
1830  *      Do state handling when we proxy a request.
1831  */
1832 static int proxy_request(REQUEST *request)
1833 {
1834         struct timeval when;
1835         char buffer[128];
1836
1837         if (request->home_server->server) {
1838                 RDEBUG("ERROR: Cannot perform real proxying to a virtual server.");
1839                 return 0;
1840         }
1841
1842         if (!insert_into_proxy_hash(request, FALSE)) {
1843                 RDEBUG("ERROR: Failed inserting request into proxy hash.");
1844                 return 0;
1845         }
1846
1847         request->proxy_listener->encode(request->proxy_listener, request);
1848
1849         when = request->received;
1850         when.tv_sec += request->root->max_request_time;
1851
1852         gettimeofday(&request->proxy_when, NULL);
1853
1854         request->next_when = request->proxy_when;
1855         request->next_when.tv_sec += request->home_server->response_window;
1856
1857         rad_assert(request->home_server->response_window > 0);
1858
1859         if (timercmp(&when, &request->next_when, <)) {
1860                 request->next_when = when;
1861         }
1862         request->next_callback = no_response_to_proxied_request;
1863
1864         RDEBUG2("Proxying request %d to home server %s port %d",
1865                request->number,
1866                inet_ntop(request->proxy->dst_ipaddr.af,
1867                          &request->proxy->dst_ipaddr.ipaddr,
1868                          buffer, sizeof(buffer)),
1869                request->proxy->dst_port);
1870
1871         /*
1872          *      Note that we set proxied BEFORE sending the packet.
1873          *
1874          *      Once we send it, the request is tainted, as
1875          *      another thread may have picked it up.  Don't
1876          *      touch it!
1877          */
1878         request->num_proxied_requests = 1;
1879         request->num_proxied_responses = 0;
1880 #ifdef HAVE_PTHREAD_H
1881         request->child_pid = NO_SUCH_CHILD_PID;
1882 #endif
1883         request->child_state = REQUEST_PROXIED;
1884
1885         DEBUG_PACKET(request, request->proxy, 1);
1886
1887         request->proxy_listener->send(request->proxy_listener,
1888                                       request);
1889         return 1;
1890 }
1891
1892
1893 /*
1894  *      "Proxy" the request by sending it to a new virtual server.
1895  */
1896 static int proxy_to_virtual_server(REQUEST *request)
1897 {
1898         REQUEST *fake;
1899         RAD_REQUEST_FUNP fun;
1900
1901         if (!request->home_server || !request->home_server->server) return 0;
1902
1903         if (request->parent) {
1904                 RDEBUG2("WARNING: Cancelling proxy request to virtual server %s as this request was itself proxied.", request->home_server->server);
1905                 return 0;
1906         }
1907
1908         fake = request_alloc_fake(request);
1909         if (!fake) {
1910                 RDEBUG2("WARNING: Out of memory");
1911                 return 0;
1912         }
1913
1914         fake->packet->vps = paircopy(request->proxy->vps);
1915         fake->server = request->home_server->server;
1916
1917         if (request->proxy->code == PW_AUTHENTICATION_REQUEST) {
1918                 fun = rad_authenticate;
1919
1920 #ifdef WITH_ACCOUNTING
1921         } else if (request->proxy->code == PW_ACCOUNTING_REQUEST) {
1922                 fun = rad_accounting;
1923 #endif
1924
1925         } else {
1926                 RDEBUG2("Unknown packet type %d", request->proxy->code);
1927                 request_free(&fake);
1928                 return 0;
1929         }
1930
1931         RDEBUG2(">>> Sending proxied request internally to virtual server.");
1932         radius_handle_request(fake, fun);
1933         RDEBUG2("<<< Received proxied response from internal virtual server.");
1934
1935         request->proxy_reply = fake->reply;
1936         fake->reply = NULL;
1937
1938         request_free(&fake);
1939
1940         process_proxy_reply(request);
1941
1942         if (request->server) RDEBUG("server %s {",
1943                                     request->server != NULL ?
1944                                     request->server : "");
1945         fun(request);
1946
1947         if (request->server) RDEBUG("} # server %s",
1948                                     request->server != NULL ?
1949                                     request->server : "");
1950
1951         return 2;               /* success, but NOT '1' !*/
1952 }
1953
1954 /*
1955  *      Return 1 if we did proxy it, or the proxy attempt failed
1956  *      completely.  Either way, the caller doesn't touch the request
1957  *      any more if we return 1.
1958  */
1959 static int successfully_proxied_request(REQUEST *request)
1960 {
1961         int rcode;
1962         int pre_proxy_type = 0;
1963         VALUE_PAIR *realmpair;
1964         VALUE_PAIR *strippedname;
1965         VALUE_PAIR *vp;
1966         char *realmname = NULL;
1967         home_server *home;
1968         REALM *realm = NULL;
1969         home_pool_t *pool;
1970
1971         /*
1972          *      If it was already proxied, do nothing.
1973          *
1974          *      FIXME: This should really be a serious error.
1975          */
1976         if (request->in_proxy_hash) {
1977                 return 0;
1978         }
1979
1980         realmpair = pairfind(request->config_items, PW_PROXY_TO_REALM);
1981         if (!realmpair || (realmpair->length == 0)) {
1982                 return 0;
1983         }
1984
1985         realmname = (char *) realmpair->vp_strvalue;
1986
1987         realm = realm_find2(realmname);
1988         if (!realm) {
1989                 RDEBUG2("ERROR: Cannot proxy to unknown realm %s", realmname);
1990                 return 0;
1991         }
1992
1993         /*
1994          *      Figure out which pool to use.
1995          */
1996         if (request->packet->code == PW_AUTHENTICATION_REQUEST) {
1997                 pool = realm->auth_pool;
1998
1999 #ifdef WITH_ACCOUNTING
2000         } else if (request->packet->code == PW_ACCOUNTING_REQUEST) {
2001                 pool = realm->acct_pool;
2002 #endif
2003
2004         } else {
2005                 rad_panic("Internal sanity check failed");
2006         }
2007
2008         if (!pool) {
2009                 RDEBUG2(" WARNING: Cancelling proxy to Realm %s, as the realm is local.",
2010                        realmname);
2011                 return 0;
2012         }
2013
2014         home = home_server_ldb(realmname, pool, request);
2015         if (!home) {
2016                 RDEBUG2("ERROR: Failed to find live home server for realm %s",
2017                        realmname);
2018                 return -1;
2019         }
2020         request->home_pool = pool;
2021
2022 #ifdef WITH_COA
2023         /*
2024          *      Once we've decided to proxy a request, we cannot send
2025          *      a CoA packet.  So we free up any CoA packet here.
2026          */
2027         request_free(&request->coa);
2028 #endif
2029         /*
2030          *      Remember that we sent the request to a Realm.
2031          */
2032         pairadd(&request->packet->vps,
2033                 pairmake("Realm", realmname, T_OP_EQ));
2034
2035         /*
2036          *      Strip the name, if told to.
2037          *
2038          *      Doing it here catches the case of proxied tunneled
2039          *      requests.
2040          */
2041         if (realm->striprealm == TRUE &&
2042            (strippedname = pairfind(request->proxy->vps, PW_STRIPPED_USER_NAME)) != NULL) {
2043                 /*
2044                  *      If there's a Stripped-User-Name attribute in
2045                  *      the request, then use THAT as the User-Name
2046                  *      for the proxied request, instead of the
2047                  *      original name.
2048                  *
2049                  *      This is done by making a copy of the
2050                  *      Stripped-User-Name attribute, turning it into
2051                  *      a User-Name attribute, deleting the
2052                  *      Stripped-User-Name and User-Name attributes
2053                  *      from the vps list, and making the new
2054                  *      User-Name the head of the vps list.
2055                  */
2056                 vp = pairfind(request->proxy->vps, PW_USER_NAME);
2057                 if (!vp) {
2058                         vp = radius_paircreate(request, NULL,
2059                                                PW_USER_NAME, PW_TYPE_STRING);
2060                         rad_assert(vp != NULL); /* handled by above function */
2061                         /* Insert at the START of the list */
2062                         vp->next = request->proxy->vps;
2063                         request->proxy->vps = vp;
2064                 }
2065                 memcpy(vp->vp_strvalue, strippedname->vp_strvalue,
2066                        sizeof(vp->vp_strvalue));
2067                 vp->length = strippedname->length;
2068
2069                 /*
2070                  *      Do NOT delete Stripped-User-Name.
2071                  */
2072         }
2073
2074         /*
2075          *      If there is no PW_CHAP_CHALLENGE attribute but
2076          *      there is a PW_CHAP_PASSWORD we need to add it
2077          *      since we can't use the request authenticator
2078          *      anymore - we changed it.
2079          */
2080         if (pairfind(request->proxy->vps, PW_CHAP_PASSWORD) &&
2081             pairfind(request->proxy->vps, PW_CHAP_CHALLENGE) == NULL) {
2082                 vp = radius_paircreate(request, &request->proxy->vps,
2083                                        PW_CHAP_CHALLENGE, PW_TYPE_OCTETS);
2084                 vp->length = AUTH_VECTOR_LEN;
2085                 memcpy(vp->vp_strvalue, request->packet->vector, AUTH_VECTOR_LEN);
2086         }
2087
2088         /*
2089          *      The RFC's say we have to do this, but FreeRADIUS
2090          *      doesn't need it.
2091          */
2092         vp = radius_paircreate(request, &request->proxy->vps,
2093                                PW_PROXY_STATE, PW_TYPE_OCTETS);
2094         snprintf(vp->vp_strvalue, sizeof(vp->vp_strvalue), "%d",
2095                  request->packet->id);
2096         vp->length = strlen(vp->vp_strvalue);
2097
2098         /*
2099          *      Should be done BEFORE inserting into proxy hash, as
2100          *      pre-proxy may use this information, or change it.
2101          */
2102         request->proxy->code = request->packet->code;
2103
2104         /*
2105          *      Call the pre-proxy routines.
2106          */
2107         vp = pairfind(request->config_items, PW_PRE_PROXY_TYPE);
2108         if (vp) {
2109                 RDEBUG2("  Found Pre-Proxy-Type %s", vp->vp_strvalue);
2110                 pre_proxy_type = vp->vp_integer;
2111         }
2112
2113         rad_assert(request->home_pool != NULL);
2114
2115         if (request->home_pool->virtual_server) {
2116                 const char *old_server = request->server;
2117
2118                 request->server = request->home_pool->virtual_server;
2119                 RDEBUG2(" server %s {", request->server);
2120                 rcode = module_pre_proxy(pre_proxy_type, request);
2121                 RDEBUG2(" }");
2122                         request->server = old_server;
2123         } else {
2124                 rcode = module_pre_proxy(pre_proxy_type, request);
2125         }
2126         switch (rcode) {
2127         case RLM_MODULE_FAIL:
2128         case RLM_MODULE_INVALID:
2129         case RLM_MODULE_NOTFOUND:
2130         case RLM_MODULE_USERLOCK:
2131         default:
2132                 /* FIXME: debug print failed stuff */
2133                 return -1;
2134
2135         case RLM_MODULE_REJECT:
2136         case RLM_MODULE_HANDLED:
2137                 return 0;
2138
2139         /*
2140          *      Only proxy the packet if the pre-proxy code succeeded.
2141          */
2142         case RLM_MODULE_NOOP:
2143         case RLM_MODULE_OK:
2144         case RLM_MODULE_UPDATED:
2145                 break;
2146         }
2147
2148         /*
2149          *      If it's a fake request, don't send the proxy
2150          *      packet.  The outer tunnel session will take
2151          *      care of doing that.
2152          */
2153         if (request->packet->dst_port == 0) {
2154                 request->home_server = NULL;
2155                 return 1;
2156         }
2157
2158         if (request->home_server->server) {
2159                 return proxy_to_virtual_server(request);
2160         }
2161
2162         if (!proxy_request(request)) {
2163                 RDEBUG("ERROR: Failed to proxy request %d", request->number);
2164                 return -1;
2165         }
2166
2167         return 1;
2168 }
2169 #endif
2170
2171 static void request_post_handler(REQUEST *request)
2172 {
2173         int child_state = -1;
2174         struct timeval when;
2175         VALUE_PAIR *vp;
2176
2177         if ((request->master_state == REQUEST_STOP_PROCESSING) ||
2178             (request->parent &&
2179              (request->parent->master_state == REQUEST_STOP_PROCESSING))) {
2180                 RDEBUG2("Request %d was cancelled.", request->number);
2181 #ifdef HAVE_PTHREAD_H
2182                 request->child_pid = NO_SUCH_CHILD_PID;
2183 #endif
2184                 child_state = REQUEST_DONE;
2185                 goto cleanup;
2186         }
2187
2188         if (request->child_state != REQUEST_RUNNING) {
2189                 rad_panic("Internal sanity check failed");
2190         }
2191
2192 #ifdef WITH_COA
2193         /*
2194          *      If it's not in the request hash, it's a CoA request.
2195          *      We hope.
2196          */
2197         if (!request->in_request_hash &&
2198             request->proxy &&
2199             ((request->proxy->code == PW_COA_REQUEST) ||
2200              (request->proxy->code == PW_DISCONNECT_REQUEST))) {
2201                 request->next_callback = NULL;
2202                 child_state = REQUEST_DONE;
2203                 goto cleanup;
2204         }
2205 #endif
2206
2207         if ((request->reply->code == 0) &&
2208             ((vp = pairfind(request->config_items, PW_AUTH_TYPE)) != NULL) &&
2209             (vp->vp_integer == PW_AUTHTYPE_REJECT)) {
2210                 request->reply->code = PW_AUTHENTICATION_REJECT;
2211         }
2212
2213 #ifdef WITH_PROXY
2214         if (request->root->proxy_requests &&
2215             !request->in_proxy_hash &&
2216             (request->reply->code == 0) &&
2217             (request->packet->dst_port != 0) &&
2218             (request->packet->code != PW_STATUS_SERVER)) {
2219                 int rcode = successfully_proxied_request(request);
2220
2221                 if (rcode == 1) return; /* request is invalid */
2222
2223                 /*
2224                  *      Failed proxying it (dead home servers, etc.)
2225                  *      Run it through Post-Proxy-Type = Fail, and
2226                  *      respond to the request.
2227                  *
2228                  *      Note that we're in a child thread here, so we
2229                  *      do NOT re-schedule the request.  Instead, we
2230                  *      do what we would have done, which is run the
2231                  *      pre-handler, a NULL request handler, and then
2232                  *      the post handler.
2233                  */
2234                 if ((rcode < 0) && setup_post_proxy_fail(request)) {
2235                         request_pre_handler(request);
2236                 }
2237
2238                 /*
2239                  *      Else we weren't supposed to proxy it,
2240                  *      OR we proxied it internally to a virutal server.
2241                  */
2242         }
2243 #endif
2244
2245         /*
2246          *      Fake requests don't get encoded or signed.  The caller
2247          *      also requires the reply VP's, so we don't free them
2248          *      here!
2249          */
2250         if (request->packet->dst_port == 0) {
2251                 /* FIXME: RDEBUG going to the next request */
2252 #ifdef HAVE_PTHREAD_H
2253                 request->child_pid = NO_SUCH_CHILD_PID;
2254 #endif
2255                 request->child_state = REQUEST_DONE;
2256                 return;
2257         }
2258
2259 #ifdef WITH_PROXY
2260         /*
2261          *      Copy Proxy-State from the request to the reply.
2262          */
2263         vp = paircopy2(request->packet->vps, PW_PROXY_STATE);
2264         if (vp) pairadd(&request->reply->vps, vp);
2265 #endif
2266
2267         /*
2268          *      Access-Requests get delayed or cached.
2269          */
2270         switch (request->packet->code) {
2271         case PW_AUTHENTICATION_REQUEST:
2272                 gettimeofday(&request->next_when, NULL);
2273
2274                 if (request->reply->code == 0) {
2275                         /*
2276                          *      Check if the lack of response is intentional.
2277                          */
2278                         vp = pairfind(request->config_items,
2279                                       PW_RESPONSE_PACKET_TYPE);
2280                         if (!vp) {
2281                                 RDEBUG2("There was no response configured: rejecting request %d",
2282                                        request->number);
2283                                 request->reply->code = PW_AUTHENTICATION_REJECT;
2284
2285                         } else if (vp->vp_integer == 256) {
2286                                 RDEBUG2("Not responding to request %d",
2287                                        request->number);
2288
2289                                 /*
2290                                  *      Force cleanup after a long
2291                                  *      time, so that we don't
2292                                  *      re-process the packet.
2293                                  */
2294                                 request->next_when.tv_sec += request->root->max_request_time;
2295                                 request->next_callback = cleanup_delay;
2296                                 child_state = REQUEST_CLEANUP_DELAY;
2297                                 break;
2298                         } else {
2299                                 request->reply->code = vp->vp_integer;
2300
2301                         }
2302                 }
2303
2304                 /*
2305                  *      Run rejected packets through
2306                  *
2307                  *      Post-Auth-Type = Reject
2308                  */
2309                 if (request->reply->code == PW_AUTHENTICATION_REJECT) {
2310                         pairdelete(&request->config_items, PW_POST_AUTH_TYPE);
2311                         vp = radius_pairmake(request, &request->config_items,
2312                                              "Post-Auth-Type", "Reject",
2313                                              T_OP_SET);
2314                         if (vp) rad_postauth(request);
2315
2316                         /*
2317                          *      If configured, delay Access-Reject packets.
2318                          *
2319                          *      If request->root->reject_delay = 0, we discover
2320                          *      that we have to send the packet now.
2321                          */
2322                         when = request->received;
2323                         when.tv_sec += request->root->reject_delay;
2324
2325                         if (timercmp(&when, &request->next_when, >)) {
2326                                 RDEBUG2("Delaying reject of request %d for %d seconds",
2327                                        request->number,
2328                                        request->root->reject_delay);
2329                                 request->next_when = when;
2330                                 request->next_callback = reject_delay;
2331 #ifdef HAVE_PTHREAD_H
2332                                 request->child_pid = NO_SUCH_CHILD_PID;
2333 #endif
2334                                 request->child_state = REQUEST_REJECT_DELAY;
2335                                 return;
2336                         }
2337                 }
2338
2339                 request->next_when.tv_sec += request->root->cleanup_delay;
2340                 request->next_callback = cleanup_delay;
2341                 child_state = REQUEST_CLEANUP_DELAY;
2342                 break;
2343
2344         case PW_ACCOUNTING_REQUEST:
2345                 request->next_callback = NULL; /* just to be safe */
2346                 child_state = REQUEST_DONE;
2347                 break;
2348
2349                 /*
2350                  *      FIXME: Status-Server should probably not be
2351                  *      handled here...
2352                  */
2353         case PW_STATUS_SERVER:
2354                 request->next_callback = NULL;
2355                 child_state = REQUEST_DONE;
2356                 break;
2357
2358         default:
2359                 if ((request->packet->code > 1024) &&
2360                     (request->packet->code < (1024 + 254 + 1))) {
2361                         request->next_callback = NULL;
2362                         child_state = REQUEST_DONE;
2363                         break;
2364                 }
2365
2366                 radlog(L_ERR, "Unknown packet type %d", request->packet->code);
2367                 request->next_callback = NULL;
2368                 child_state = REQUEST_DONE;
2369                 break;
2370         }
2371
2372         /*
2373          *      Suppress "no reply" packets here, unless we're reading
2374          *      from the "detail" file.  In that case, we've got to
2375          *      tell the detail file handler that the request is dead,
2376          *      and it should re-send it.
2377          *      If configured, encode, sign, and send.
2378          */
2379         if ((request->reply->code != 0) ||
2380             (request->listener->type == RAD_LISTEN_DETAIL)) {
2381                 DEBUG_PACKET(request, request->reply, 1);
2382                 request->listener->send(request->listener, request);
2383         }
2384
2385 #ifdef WITH_COA
2386         /*
2387          *      Now that we've completely processed the request,
2388          *      see if we need to originate a CoA request.
2389          */
2390         if (request->coa ||
2391             (pairfind(request->config_items, PW_SEND_COA_REQUEST) != NULL)) {
2392                 if (!originated_coa_request(request)) {
2393                         RDEBUG2("Do CoA Fail handler here");
2394                 }
2395                 /* request->coa is stil set, so we can update events */
2396         }
2397 #endif
2398
2399  cleanup:
2400         /*
2401          *      Clean up.  These are no longer needed.
2402          */
2403         pairfree(&request->config_items);
2404
2405         pairfree(&request->packet->vps);
2406         request->username = NULL;
2407         request->password = NULL;
2408
2409         pairfree(&request->reply->vps);
2410
2411 #ifdef WITH_PROXY
2412         if (request->proxy) {
2413                 pairfree(&request->proxy->vps);
2414
2415                 if (request->proxy_reply) {
2416                         pairfree(&request->proxy_reply->vps);
2417                 }
2418
2419 #if 0
2420                 /*
2421                  *      We're not tracking responses from the home
2422                  *      server, we can therefore free this memory in
2423                  *      the child thread.
2424                  */
2425                 if (!request->in_proxy_hash) {
2426                         rad_free(&request->proxy);
2427                         rad_free(&request->proxy_reply);
2428                         request->home_server = NULL;
2429                 }
2430 #endif
2431         }
2432 #endif
2433
2434         RDEBUG2("Finished request %d.", request->number);
2435         rad_assert(child_state >= 0);
2436         request->child_state = child_state;
2437
2438         /*
2439          *      Single threaded mode: update timers now.
2440          */
2441         if (!have_children) wait_a_bit(request);
2442 }
2443
2444
2445 static void received_retransmit(REQUEST *request, const RADCLIENT *client)
2446 {
2447 #ifdef WITH_PROXY
2448         char buffer[128];
2449 #endif
2450
2451         RAD_STATS_TYPE_INC(request->listener, total_dup_requests);
2452         RAD_STATS_CLIENT_INC(request->listener, client, total_dup_requests);
2453
2454         switch (request->child_state) {
2455         case REQUEST_QUEUED:
2456         case REQUEST_RUNNING:
2457 #ifdef WITH_PROXY
2458         discard:
2459 #endif
2460                 radlog(L_ERR, "Discarding duplicate request from "
2461                        "client %s port %d - ID: %d due to unfinished request %d",
2462                        client->shortname,
2463                        request->packet->src_port,request->packet->id,
2464                        request->number);
2465                 break;
2466
2467 #ifdef WITH_PROXY
2468         case REQUEST_PROXIED:
2469                 /*
2470                  *      We're not supposed to have duplicate
2471                  *      accounting packets.  The other states handle
2472                  *      duplicates fine (discard, or send duplicate
2473                  *      reply).  But we do NOT want to retransmit an
2474                  *      accounting request here, because that would
2475                  *      involve updating the Acct-Delay-Time, and
2476                  *      therefore changing the packet Id, etc.
2477                  *
2478                  *      Instead, we just discard the packet.  We may
2479                  *      eventually respond, or the client will send a
2480                  *      new accounting packet.
2481                  *
2482                  *      The same comments go for Status-Server, and
2483                  *      other packet types.
2484                  *
2485                  *      FIXME: coa: when we proxy CoA && Disconnect
2486                  *      packets, this logic has to be fixed.
2487                  */
2488                 if (request->packet->code != PW_AUTHENTICATION_REQUEST) {
2489                         goto discard;
2490                 }
2491
2492                 check_for_zombie_home_server(request);
2493
2494                 /*
2495                  *      If we've just discovered that the home server is
2496                  *      dead, send the packet to another one.
2497                  */
2498                 if ((request->packet->dst_port != 0) &&
2499                     (request->home_server->state == HOME_STATE_IS_DEAD)) {
2500                         home_server *home;
2501
2502                         remove_from_proxy_hash(request);
2503
2504                         home = home_server_ldb(NULL, request->home_pool, request);
2505                         if (!home) {
2506                                 RDEBUG2("Failed to find live home server for request %d", request->number);
2507                         no_home_servers:
2508                                 /*
2509                                  *      Do post-request processing,
2510                                  *      and any insertion of necessary
2511                                  *      events.
2512                                  */
2513                                 post_proxy_fail_handler(request);
2514                                 return;
2515                         }
2516
2517                         request->proxy->code = request->packet->code;
2518
2519                         /*
2520                          *      Free the old packet, to force re-encoding
2521                          */
2522                         free(request->proxy->data);
2523                         request->proxy->data = NULL;
2524                         request->proxy->data_len = 0;
2525
2526                         /*
2527                          *      This request failed over to a virtual
2528                          *      server.  Push it back onto the queue
2529                          *      to be processed.
2530                          */
2531                         if (request->home_server->server) {
2532                                 proxy_fallback_handler(request);
2533                                 return;
2534                         }
2535
2536                         /*
2537                          *      Try to proxy the request.
2538                          */
2539                         if (!proxy_request(request)) {
2540                                 RDEBUG("ERROR: Failed to re-proxy request %d", request->number);
2541                                 goto no_home_servers;
2542                         }
2543
2544                         /*
2545                          *      This code executes in the main server
2546                          *      thread, so there's no need for locking.
2547                          */
2548                         rad_assert(request->next_callback != NULL);
2549                         INSERT_EVENT(request->next_callback, request);
2550                         request->next_callback = NULL;
2551                         return;
2552                 } /* else the home server is still alive */
2553
2554                 RDEBUG2("Sending duplicate proxied request to home server %s port %d - ID: %d",
2555                        inet_ntop(request->proxy->dst_ipaddr.af,
2556                                  &request->proxy->dst_ipaddr.ipaddr,
2557                                  buffer, sizeof(buffer)),
2558                        request->proxy->dst_port,
2559                        request->proxy->id);
2560                 request->num_proxied_requests++;
2561
2562                 DEBUG_PACKET(request, request->proxy, 1);
2563                 request->proxy_listener->send(request->proxy_listener,
2564                                               request);
2565                 break;
2566 #endif
2567
2568         case REQUEST_REJECT_DELAY:
2569                 RDEBUG2("Waiting to send Access-Reject "
2570                        "to client %s port %d - ID: %d",
2571                        client->shortname,
2572                        request->packet->src_port, request->packet->id);
2573                 break;
2574
2575         case REQUEST_CLEANUP_DELAY:
2576         case REQUEST_DONE:
2577                 if (request->reply->code == 0) {
2578                         RDEBUG2("Ignoring retransmit from client %s port %d "
2579                                 "- ID: %d, no reply was configured",
2580                                 client->shortname,
2581                                 request->packet->src_port, request->packet->id);
2582                         return;
2583                 }
2584
2585                 /*
2586                  *      FIXME: This sends duplicate replies to
2587                  *      accounting requests, even if Acct-Delay-Time
2588                  *      or Event-Timestamp is in the packet.  In those
2589                  *      cases, the Id should be changed, and the packet
2590                  *      re-calculated.
2591                  */
2592                 RDEBUG2("Sending duplicate reply "
2593                        "to client %s port %d - ID: %d",
2594                        client->shortname,
2595                        request->packet->src_port, request->packet->id);
2596                 DEBUG_PACKET(request, request->reply, 1);
2597                 request->listener->send(request->listener, request);
2598                 break;
2599         }
2600 }
2601
2602
2603 static void received_conflicting_request(REQUEST *request,
2604                                          const RADCLIENT *client)
2605 {
2606         radlog(L_ERR, "Received conflicting packet from "
2607                "client %s port %d - ID: %d due to unfinished request %d.  Giving up on old request.",
2608                client->shortname,
2609                request->packet->src_port, request->packet->id,
2610                request->number);
2611
2612         /*
2613          *      Nuke it from the request hash, so we can receive new
2614          *      packets.
2615          */
2616         remove_from_request_hash(request);
2617
2618         switch (request->child_state) {
2619 #ifdef HAVE_PTHREAD_H
2620                 /*
2621                  *      It's queued or running.  Tell it to stop, and
2622                  *      wait for it to do so.
2623                  */
2624         case REQUEST_QUEUED:
2625         case REQUEST_RUNNING:
2626                 request->master_state = REQUEST_STOP_PROCESSING;
2627                 request->delay += request->delay >> 1;
2628
2629                 tv_add(&request->when, request->delay);
2630
2631                 INSERT_EVENT(wait_for_child_to_die, request);
2632                 return;
2633 #endif
2634
2635                 /*
2636                  *      It's in some other state, and therefore also
2637                  *      in the event queue.  At some point, the
2638                  *      child will notice, and we can then delete it.
2639                  */
2640         default:
2641                 rad_assert(request->ev != NULL);
2642                 break;
2643         }
2644 }
2645
2646
2647 static int can_handle_new_request(RADIUS_PACKET *packet,
2648                                   RADCLIENT *client,
2649                                   struct main_config_t *root)
2650 {
2651         /*
2652          *      Count the total number of requests, to see if
2653          *      there are too many.  If so, return with an
2654          *      error.
2655          */
2656         if (root->max_requests) {
2657                 int request_count = fr_packet_list_num_elements(pl);
2658
2659                 /*
2660                  *      This is a new request.  Let's see if
2661                  *      it makes us go over our configured
2662                  *      bounds.
2663                  */
2664                 if (request_count > root->max_requests) {
2665                         radlog(L_ERR, "Dropping request (%d is too many): "
2666                                "from client %s port %d - ID: %d", request_count,
2667                                client->shortname,
2668                                packet->src_port, packet->id);
2669                         radlog(L_INFO, "WARNING: Please check the configuration file.\n"
2670                                "\tThe value for 'max_requests' is probably set too low.\n");
2671                         return 0;
2672                 } /* else there were a small number of requests */
2673         } /* else there was no configured limit for requests */
2674
2675         /*
2676          *      FIXME: Add per-client checks.  If one client is sending
2677          *      too many packets, start discarding them.
2678          *
2679          *      We increment the counters here, and decrement them
2680          *      when the response is sent... somewhere in this file.
2681          */
2682
2683         /*
2684          *      FUTURE: Add checks for system load.  If the system is
2685          *      busy, start dropping requests...
2686          *
2687          *      We can probably keep some statistics ourselves...  if
2688          *      there are more requests coming in than we can handle,
2689          *      start dropping some.
2690          */
2691
2692         return 1;
2693 }
2694
2695
2696 int received_request(rad_listen_t *listener,
2697                      RADIUS_PACKET *packet, REQUEST **prequest,
2698                      RADCLIENT *client)
2699 {
2700         RADIUS_PACKET **packet_p;
2701         REQUEST *request = NULL;
2702         struct main_config_t *root = &mainconfig;
2703
2704         packet_p = fr_packet_list_find(pl, packet);
2705         if (packet_p) {
2706                 request = fr_packet2myptr(REQUEST, packet, packet_p);
2707                 rad_assert(request->in_request_hash);
2708
2709                 if ((request->packet->data_len == packet->data_len) &&
2710                     (memcmp(request->packet->vector, packet->vector,
2711                             sizeof(packet->vector)) == 0)) {
2712                         received_retransmit(request, client);
2713                         return 0;
2714                 }
2715
2716                 /*
2717                  *      The new request is different from the old one,
2718                  *      but maybe the old is finished.  If so, delete
2719                  *      the old one.
2720                  */
2721                 switch (request->child_state) {
2722                         struct timeval when;
2723
2724                 default:
2725                         /*
2726                          *      Special hacks for race conditions.
2727                          *      The reply is encoded, and therefore
2728                          *      likely sent.  We received a *new*
2729                          *      packet from the client, likely before
2730                          *      the next line or two of code which
2731                          *      updated the child state.  In this
2732                          *      case, just accept the new request.
2733                          */
2734                         if ((request->reply->code != 0) &&
2735                             request->reply->data) {
2736                                 radlog(L_INFO, "WARNING: Allowing fast client %s port %d - ID: %d for recent request %d.",
2737                                        client->shortname,
2738                                        packet->src_port, packet->id,
2739                                        request->number);
2740                                 remove_from_request_hash(request);
2741                                 request = NULL;
2742                                 break;
2743                         }
2744
2745                         gettimeofday(&when, NULL);
2746                         when.tv_sec -= 1;
2747
2748                         /*
2749                          *      If the cached request was received
2750                          *      within the last second, then we
2751                          *      discard the NEW request instead of the
2752                          *      old one.  This will happen ONLY when
2753                          *      the client is severely broken, and is
2754                          *      sending conflicting packets very
2755                          *      quickly.
2756                          */
2757                         if (timercmp(&when, &request->received, <)) {
2758                                 radlog(L_ERR, "Discarding conflicting packet from "
2759                                        "client %s port %d - ID: %d due to recent request %d.",
2760                                        client->shortname,
2761                                        packet->src_port, packet->id,
2762                                        request->number);
2763                                 return 0;
2764                         }
2765
2766                         received_conflicting_request(request, client);
2767                         request = NULL;
2768                         break;
2769
2770                 case REQUEST_REJECT_DELAY:
2771                 case REQUEST_CLEANUP_DELAY:
2772                         request->child_state = REQUEST_DONE;
2773                 case REQUEST_DONE:
2774                         cleanup_delay(request);
2775                         request = NULL;
2776                         break;
2777                 }
2778         }
2779
2780         /*
2781          *      We may want to quench the new request.
2782          */
2783         if ((listener->type != RAD_LISTEN_DETAIL) &&
2784             !can_handle_new_request(packet, client, root)) {
2785                 return 0;
2786         }
2787
2788         /*
2789          *      Create and initialize the new request.
2790          */
2791         request = request_alloc(); /* never fails */
2792
2793         if ((request->reply = rad_alloc(0)) == NULL) {
2794                 radlog(L_ERR, "No memory");
2795                 exit(1);
2796         }
2797
2798         request->listener = listener;
2799         request->client = client;
2800         request->packet = packet;
2801         request->packet->timestamp = request->timestamp;
2802         request->number = request_num_counter++;
2803         request->priority = listener->type;
2804 #ifdef HAVE_PTHREAD_H
2805         request->child_pid = NO_SUCH_CHILD_PID;
2806 #endif
2807
2808         /*
2809          *      Status-Server packets go to the head of the queue.
2810          */
2811         if (request->packet->code == PW_STATUS_SERVER) request->priority = 0;
2812
2813         /*
2814          *      Set virtual server identity
2815          */
2816         if (client->server) {
2817                 request->server = client->server;
2818         } else if (listener->server) {
2819                 request->server = listener->server;
2820         } else {
2821                 request->server = NULL;
2822         }
2823
2824         /*
2825          *      Remember the request in the list.
2826          */
2827         if (!fr_packet_list_insert(pl, &request->packet)) {
2828                 radlog(L_ERR, "Failed to insert request %d in the list of live requests: discarding", request->number);
2829                 request_free(&request);
2830                 return 0;
2831         }
2832
2833         request->in_request_hash = TRUE;
2834         request->root = root;
2835         root->refcount++;
2836
2837         /*
2838          *      The request passes many of our sanity checks.
2839          *      From here on in, if anything goes wrong, we
2840          *      send a reject message, instead of dropping the
2841          *      packet.
2842          */
2843
2844         /*
2845          *      Build the reply template from the request.
2846          */
2847
2848         request->reply->sockfd = request->packet->sockfd;
2849         request->reply->dst_ipaddr = request->packet->src_ipaddr;
2850         request->reply->src_ipaddr = request->packet->dst_ipaddr;
2851         request->reply->dst_port = request->packet->src_port;
2852         request->reply->src_port = request->packet->dst_port;
2853         request->reply->id = request->packet->id;
2854         request->reply->code = 0; /* UNKNOWN code */
2855         memcpy(request->reply->vector, request->packet->vector,
2856                sizeof(request->reply->vector));
2857         request->reply->vps = NULL;
2858         request->reply->data = NULL;
2859         request->reply->data_len = 0;
2860
2861         request->master_state = REQUEST_ACTIVE;
2862         request->child_state = REQUEST_QUEUED;
2863         request->next_callback = NULL;
2864
2865         gettimeofday(&request->received, NULL);
2866         request->timestamp = request->received.tv_sec;
2867         request->when = request->received;
2868
2869         request->delay = USEC;
2870
2871         tv_add(&request->when, request->delay);
2872
2873         INSERT_EVENT(wait_a_bit, request);
2874
2875         *prequest = request;
2876         return 1;
2877 }
2878
2879
2880 #ifdef WITH_PROXY
2881 REQUEST *received_proxy_response(RADIUS_PACKET *packet)
2882 {
2883         char            buffer[128];
2884         REQUEST         *request;
2885
2886         /*
2887          *      Also removes from the proxy hash if responses == requests
2888          */
2889         request = lookup_in_proxy_hash(packet);
2890
2891         if (!request) {
2892                 radlog(L_PROXY, "No outstanding request was found for reply from host %s port %d - ID %d",
2893                        inet_ntop(packet->src_ipaddr.af,
2894                                  &packet->src_ipaddr.ipaddr,
2895                                  buffer, sizeof(buffer)),
2896                        packet->src_port, packet->id);
2897                 return NULL;
2898         }
2899
2900         /*
2901          *      We haven't replied to the NAS, but we have seen an
2902          *      earlier reply from the home server.  Ignore this packet,
2903          *      as we're likely still processing the previous reply.
2904          */
2905         if (request->proxy_reply) {
2906                 if (memcmp(request->proxy_reply->vector,
2907                            packet->vector,
2908                            sizeof(request->proxy_reply->vector)) == 0) {
2909                         RDEBUG2("Discarding duplicate reply from host %s port %d  - ID: %d for request %d",
2910                                inet_ntop(packet->src_ipaddr.af,
2911                                          &packet->src_ipaddr.ipaddr,
2912                                          buffer, sizeof(buffer)),
2913                                packet->src_port, packet->id,
2914                                request->number);
2915                 } else {
2916                         /*
2917                          *      ? The home server gave us a new proxy
2918                          *      reply which doesn't match the old
2919                          *      one.  Delete it.
2920                          */
2921                         RDEBUG2("Ignoring conflicting proxy reply");
2922                 }
2923
2924                 /* assert that there's an event queued for request? */
2925                 return NULL;
2926         }
2927
2928         gettimeofday(&now, NULL);
2929
2930         /*
2931          *      Maybe move this earlier in the decision process?
2932          *      Having it here means that late or duplicate proxy
2933          *      replies no longer get the home server marked as
2934          *      "alive".  This might be good for stability, though.
2935          */
2936         request->home_server->state = HOME_STATE_ALIVE;
2937
2938 #ifdef WITH_COA
2939         /*
2940          *      When originating CoA, the "proxy" reply is the reply
2941          *      to the CoA request that we originated.  At this point,
2942          *      the original request is finished, and it has a reply.
2943          *
2944          *      However, if we haven't separated the two requests, do
2945          *      so now.  This is done so that cleaning up the original
2946          *      request won't cause the CoA request to be free'd.  See
2947          *      util.c, request_free()
2948          */
2949         if (request->parent && (request->parent->coa == request)) {
2950                 request->parent->coa = NULL;
2951                 request->parent = NULL;
2952
2953         } else
2954                 /*
2955                  *      Skip the next set of checks, as the original
2956                  *      reply is cached.  We want to be able to still
2957                  *      process the CoA reply, AND to reference the
2958                  *      original request/reply.
2959                  *
2960                  *      This is getting to be really quite a bit of a
2961                  *      hack.
2962                  */
2963 #endif
2964
2965         /*
2966          *      If there's a reply to the NAS, ignore everything
2967          *      related to proxy responses
2968          */
2969         if (request->reply && request->reply->code != 0) {
2970                 RDEBUG2("Ignoring proxy reply that arrived after we sent a reply to the NAS");
2971                 return NULL;
2972         }
2973
2974 #ifdef WITH_STATS
2975         /*
2976          *      The average includes our time to receive packets and
2977          *      look them up in the hashes, which should be the same
2978          *      for all packets.
2979          *
2980          *      We update the response time only for the FIRST packet
2981          *      we receive.
2982          */
2983         if (request->home_server->ema.window > 0) {
2984                 radius_stats_ema(&request->home_server->ema,
2985                                  &now, &request->proxy_when);
2986         }
2987 #endif
2988
2989         switch (request->child_state) {
2990         case REQUEST_QUEUED:
2991         case REQUEST_RUNNING:
2992                 radlog(L_ERR, "Internal sanity check failed for child state");
2993                 /* FALL-THROUGH */
2994
2995         case REQUEST_REJECT_DELAY:
2996         case REQUEST_CLEANUP_DELAY:
2997         case REQUEST_DONE:
2998                 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'",
2999                        inet_ntop(packet->src_ipaddr.af,
3000                                  &packet->src_ipaddr.ipaddr,
3001                                  buffer, sizeof(buffer)),
3002                        packet->src_port, packet->id,
3003                        request->number);
3004                 /* assert that there's an event queued for request? */
3005                 return NULL;
3006
3007         case REQUEST_PROXIED:
3008                 break;
3009         }
3010
3011         request->proxy_reply = packet;
3012
3013 #if 0
3014         /*
3015          *      Perform RTT calculations, as per RFC 2988 (for TCP).
3016          *      Note that we only do so on the first response.
3017          */
3018         if ((request->num_proxied_responses == 1)
3019                 int rtt;
3020                 home_server *home = request->home_server;
3021
3022                 rtt = now.tv_sec - request->proxy_when.tv_sec;
3023                 rtt *= USEC;
3024                 rtt += now.tv_usec;
3025                 rtt -= request->proxy_when.tv_usec;
3026
3027                 if (!home->has_rtt) {
3028                         home->has_rtt = TRUE;
3029
3030                         home->srtt = rtt;
3031                         home->rttvar = rtt / 2;
3032
3033                 } else {
3034                         home->rttvar -= home->rttvar >> 2;
3035                         home->rttvar += (home->srtt - rtt);
3036                         home->srtt -= home->srtt >> 3;
3037                         home->srtt += rtt >> 3;
3038                 }
3039
3040                 home->rto = home->srtt;
3041                 if (home->rttvar > (USEC / 4)) {
3042                         home->rto += home->rttvar * 4;
3043                 } else {
3044                         home->rto += USEC;
3045                 }
3046         }
3047 #endif
3048
3049         /*
3050          *      There's no incoming request, so it's a proxied packet
3051          *      we originated.
3052          */
3053         if (!request->packet) {
3054                 received_response_to_ping(request);
3055                 request->proxy_reply = NULL; /* caller will free it */
3056                 request_free(&request);
3057                 return NULL;
3058         }
3059
3060         request->child_state = REQUEST_QUEUED;
3061         request->when = now;
3062         request->delay = USEC;
3063         request->priority = RAD_LISTEN_PROXY;
3064         tv_add(&request->when, request->delay);
3065
3066         /*
3067          *      Wait a bit will take care of max_request_time
3068          */
3069         INSERT_EVENT(wait_a_bit, request);
3070
3071         return request;
3072 }
3073 #endif
3074
3075 void event_new_fd(rad_listen_t *this)
3076 {
3077         char buffer[1024];
3078
3079         if (this->status == RAD_LISTEN_STATUS_KNOWN) return;
3080
3081         this->print(this, buffer, sizeof(buffer));
3082
3083         if (this->status == RAD_LISTEN_STATUS_INIT) {
3084                 if (just_started) {
3085                         DEBUG("Listening on %s", buffer);
3086                 } else {
3087                         DEBUG2(" ... adding new socket %s", buffer);
3088                 }
3089                 if (!fr_event_fd_insert(el, 0, this->fd,
3090                                         event_socket_handler, this)) {
3091                         radlog(L_ERR, "Failed remembering handle for proxy socket!");
3092                         exit(1);
3093                 }
3094
3095                 this->status = RAD_LISTEN_STATUS_KNOWN;
3096                 return;
3097         }
3098
3099         if (this->status == RAD_LISTEN_STATUS_CLOSED) {
3100                 DEBUG2(" ... closing socket %s", buffer);
3101
3102                 fr_event_fd_delete(el, 0, this->fd);
3103                 this->status = RAD_LISTEN_STATUS_FINISH;
3104
3105                 /*
3106                  *      Close the fd AFTER fixing up the requests and
3107                  *      listeners, so that they don't send/recv on the
3108                  *      wrong socket (if someone manages to open
3109                  *      another one).
3110                  */
3111                 close(this->fd);
3112                 this->fd = -1;
3113         }
3114 }
3115
3116 static void handle_signal_self(int flag)
3117 {
3118         if ((flag & (RADIUS_SIGNAL_SELF_EXIT | RADIUS_SIGNAL_SELF_TERM)) != 0) {
3119                 if ((flag & RADIUS_SIGNAL_SELF_EXIT) != 0) {
3120                         fr_event_loop_exit(el, 1);
3121                 } else {
3122                         fr_event_loop_exit(el, 2);
3123                 }
3124
3125                 return;
3126         } /* else exit/term flags weren't set */
3127
3128         /*
3129          *      Tell the even loop to stop processing.
3130          */
3131         if ((flag & RADIUS_SIGNAL_SELF_HUP) != 0) {
3132                 time_t when;
3133                 static time_t last_hup = 0;
3134
3135                 DEBUG("Received HUP signal.");
3136
3137                 when = time(NULL);
3138                 if ((int) (when - last_hup) < 5) {
3139                         radlog(L_INFO, "Ignoring HUP (less than 5s since last one)");
3140                         return;
3141                 }
3142                 last_hup = when;
3143
3144                 fr_event_loop_exit(el, 0x80);
3145         }
3146
3147 #ifdef WITH_DETAIL
3148         if ((flag & RADIUS_SIGNAL_SELF_DETAIL) != 0) {
3149                 rad_listen_t *this;
3150
3151                 /*
3152                  *      FIXME: O(N) loops suck.
3153                  */
3154                 for (this = mainconfig.listen;
3155                      this != NULL;
3156                      this = this->next) {
3157                         if (this->type != RAD_LISTEN_DETAIL) continue;
3158
3159                         /*
3160                          *      This one didn't send the signal, skip
3161                          *      it.
3162                          */
3163                         if (!this->decode(this, NULL)) continue;
3164
3165                         /*
3166                          *      Go service the interrupt.
3167                          */
3168                         event_poll_detail(this);
3169                 }
3170         }
3171 #endif
3172
3173         if ((flag & RADIUS_SIGNAL_SELF_NEW_FD) != 0) {
3174                 rad_listen_t *this;
3175
3176                 for (this = mainconfig.listen;
3177                      this != NULL;
3178                      this = this->next) {
3179                         event_new_fd(this);
3180                 }
3181         }
3182 }
3183
3184 #ifndef WITH_SELF_PIPE
3185 void radius_signal_self(int flag)
3186 {
3187         handle_signal_self(flag);
3188 }
3189 #else
3190 /*
3191  *      Inform ourselves that we received a signal.
3192  */
3193 void radius_signal_self(int flag)
3194 {
3195         ssize_t rcode;
3196         uint8_t buffer[16];
3197
3198         /*
3199          *      The read MUST be non-blocking for this to work.
3200          */
3201         rcode = read(self_pipe[0], buffer, sizeof(buffer));
3202         if (rcode > 0) {
3203                 ssize_t i;
3204
3205                 for (i = 0; i < rcode; i++) {
3206                         buffer[0] |= buffer[i];
3207                 }
3208         } else {
3209                 buffer[0] = 0;
3210         }
3211
3212         buffer[0] |= flag;
3213
3214         write(self_pipe[1], buffer, 1);
3215 }
3216
3217
3218 static void event_signal_handler(UNUSED fr_event_list_t *xel,
3219                                  UNUSED int fd, UNUSED void *ctx)
3220 {
3221         ssize_t i, rcode;
3222         uint8_t buffer[32];
3223
3224         rcode = read(self_pipe[0], buffer, sizeof(buffer));
3225         if (rcode <= 0) return;
3226
3227         /*
3228          *      Merge pending signals.
3229          */
3230         for (i = 0; i < rcode; i++) {
3231                 buffer[0] |= buffer[i];
3232         }
3233
3234         handle_signal_self(buffer[0]);
3235 }
3236 #endif
3237
3238
3239 static void event_socket_handler(fr_event_list_t *xel, UNUSED int fd,
3240                                  void *ctx)
3241 {
3242         rad_listen_t *listener = ctx;
3243         RAD_REQUEST_FUNP fun;
3244         REQUEST *request;
3245
3246         rad_assert(xel == el);
3247
3248         xel = xel;
3249
3250         if (listener->fd < 0) rad_panic("Socket was closed on us!");
3251
3252         if (!listener->recv(listener, &fun, &request)) return;
3253
3254         if (!thread_pool_addrequest(request, fun)) {
3255                 request->child_state = REQUEST_DONE;
3256         }
3257 }
3258
3259 typedef struct listen_detail_t {
3260         fr_event_t      *ev;
3261 } listen_detail_t;
3262
3263 /*
3264  *      This function is called periodically to see if this detail
3265  *      file is available for reading.
3266  */
3267 static void event_poll_detail(void *ctx)
3268 {
3269         int rcode, delay;
3270         RAD_REQUEST_FUNP fun;
3271         REQUEST *request;
3272         rad_listen_t *this = ctx;
3273         struct timeval when;
3274         listen_detail_t *detail = this->data;
3275
3276         rad_assert(this->type == RAD_LISTEN_DETAIL);
3277
3278         /*
3279          *      Try to read something.
3280          *
3281          *      FIXME: This does poll AND receive.
3282          */
3283         rcode = this->recv(this, &fun, &request);
3284         if (rcode != 0) {
3285                 rad_assert(fun != NULL);
3286                 rad_assert(request != NULL);
3287
3288                 if (!thread_pool_addrequest(request, fun)) {
3289                         request->child_state = REQUEST_DONE;
3290                 }
3291         }
3292
3293         if (!fr_event_now(el, &now)) gettimeofday(&now, NULL);
3294         when = now;
3295
3296         /*
3297          *      Backdoor API to get the delay until the next poll time.
3298          */
3299         delay = this->encode(this, NULL);
3300         tv_add(&when, delay);
3301
3302         if (!fr_event_insert(el, event_poll_detail, this,
3303                              &when, &detail->ev)) {
3304                 radlog(L_ERR, "Failed creating handler");
3305                 exit(1);
3306         }
3307 }
3308
3309
3310 static void event_status(struct timeval *wake)
3311 {
3312 #if !defined(HAVE_PTHREAD_H) && defined(WNOHANG)
3313         int argval;
3314 #endif
3315
3316         if (debug_flag == 0) {
3317                 if (just_started) {
3318                         radlog(L_INFO, "Ready to process requests.");
3319                         just_started = FALSE;
3320                 }
3321                 return;
3322         }
3323
3324         if (!wake) {
3325                 DEBUG("Ready to process requests.");
3326
3327         } else if ((wake->tv_sec != 0) ||
3328                    (wake->tv_usec >= 100000)) {
3329                 DEBUG("Waking up in %d.%01u seconds.",
3330                       (int) wake->tv_sec, (unsigned int) wake->tv_usec / 100000);
3331         }
3332
3333
3334         /*
3335          *      FIXME: Put this somewhere else, where it isn't called
3336          *      all of the time...
3337          */
3338
3339 #if !defined(HAVE_PTHREAD_H) && defined(WNOHANG)
3340         /*
3341          *      If there are no child threads, then there may
3342          *      be child processes.  In that case, wait for
3343          *      their exit status, and throw that exit status
3344          *      away.  This helps get rid of zxombie children.
3345          */
3346         while (waitpid(-1, &argval, WNOHANG) > 0) {
3347                 /* do nothing */
3348         }
3349 #endif
3350
3351 }
3352
3353 /*
3354  *      Externally-visibly functions.
3355  */
3356 int radius_event_init(CONF_SECTION *cs, int spawn_flag)
3357 {
3358         rad_listen_t *this, *head = NULL;
3359
3360         if (el) return 0;
3361
3362         time(&fr_start_time);
3363
3364         el = fr_event_list_create(event_status);
3365         if (!el) return 0;
3366
3367         pl = fr_packet_list_create(0);
3368         if (!pl) return 0;      /* leak el */
3369
3370         request_num_counter = 0;
3371
3372         /*
3373          *      Move all of the thread calls to this file?
3374          *
3375          *      It may be best for the mutexes to be in this file...
3376          */
3377         have_children = spawn_flag;
3378
3379 #ifdef WITH_PROXY
3380         if (mainconfig.proxy_requests) {
3381                 /*
3382                  *      Create the tree for managing proxied requests and
3383                  *      responses.
3384                  */
3385                 proxy_list = fr_packet_list_create(1);
3386                 if (!proxy_list) return 0;
3387
3388 #ifdef HAVE_PTHREAD_H
3389                 if (pthread_mutex_init(&proxy_mutex, NULL) != 0) {
3390                         radlog(L_ERR, "FATAL: Failed to initialize proxy mutex: %s",
3391                                strerror(errno));
3392                         exit(1);
3393                 }
3394 #endif
3395         }
3396 #endif
3397
3398         /*
3399          *      Just before we spawn the child threads, force the log
3400          *      subsystem to re-open the log file for every write.
3401          */
3402         if (spawn_flag) force_log_reopen();
3403
3404 #ifdef HAVE_PTHREAD_H
3405 #ifndef __MINGW32__
3406         NO_SUCH_CHILD_PID = (pthread_t ) (0);
3407 #else
3408         NO_SUCH_CHILD_PID = pthread_self(); /* not a child thread */
3409 #endif
3410         if (thread_pool_init(cs, spawn_flag) < 0) {
3411                 exit(1);
3412         }
3413 #endif
3414
3415         if (check_config) {
3416                 DEBUG("%s: #### Skipping IP addresses and Ports ####",
3417                        mainconfig.name);
3418                 return 1;
3419         }
3420
3421 #ifdef WITH_SELF_PIPE
3422         /*
3423          *      Child threads need a pipe to signal us, as do the
3424          *      signal handlers.
3425          */
3426         if (pipe(self_pipe) < 0) {
3427                 radlog(L_ERR, "radiusd: Error opening internal pipe: %s",
3428                        strerror(errno));
3429                 exit(1);
3430         }
3431         if (fcntl(self_pipe[0], F_SETFL, O_NONBLOCK | FD_CLOEXEC) < 0) {
3432                 radlog(L_ERR, "radiusd: Error setting internal flags: %s",
3433                        strerror(errno));
3434                 exit(1);
3435         }
3436         if (fcntl(self_pipe[1], F_SETFL, O_NONBLOCK | FD_CLOEXEC) < 0) {
3437                 radlog(L_ERR, "radiusd: Error setting internal flags: %s",
3438                        strerror(errno));
3439                 exit(1);
3440         }
3441
3442         if (!fr_event_fd_insert(el, 0, self_pipe[0],
3443                                   event_signal_handler, el)) {
3444                 radlog(L_ERR, "Failed creating handler for signals");
3445                 exit(1);
3446         }
3447 #endif  /* WITH_SELF_PIPE */
3448
3449 #ifdef WITH_PROXY
3450         /*
3451          *      Mark the proxy Fd's as unused.
3452          */
3453         {
3454                 int i;
3455
3456                 for (i = 0; i < 32; i++) proxy_fds[i] = -1;
3457         }
3458 #endif
3459
3460        DEBUG("%s: #### Opening IP addresses and Ports ####",
3461                mainconfig.name);
3462
3463        /*
3464         *       The server temporarily switches to an unprivileged
3465         *       user very early in the bootstrapping process.
3466         *       However, some sockets MAY require privileged access
3467         *       (bind to device, or to port < 1024, or to raw
3468         *       sockets).  Those sockets need to call suid up/down
3469         *       themselves around the functions that need a privileged
3470         *       uid.
3471         */
3472         if (listen_init(cs, &head) < 0) {
3473                 _exit(1);
3474         }
3475
3476         /*
3477          *      At this point, no one has any business *ever* going
3478          *      back to root uid.
3479          */
3480         fr_suid_down_permanent();
3481
3482         /*
3483          *      Add all of the sockets to the event loop.
3484          */
3485         for (this = head;
3486              this != NULL;
3487              this = this->next) {
3488                 char buffer[256];
3489
3490                 this->print(this, buffer, sizeof(buffer));
3491
3492                 switch (this->type) {
3493 #ifdef WITH_DETAIL
3494                 case RAD_LISTEN_DETAIL:
3495                         DEBUG("Listening on %s", buffer);
3496
3497                         /*
3498                          *      Detail files are always known, and aren't
3499                          *      put into the socket event loop.
3500                          */
3501                         this->status = RAD_LISTEN_STATUS_KNOWN;
3502
3503                         /*
3504                          *      Set up the first poll interval.
3505                          */
3506                         event_poll_detail(this);
3507                         break;
3508 #endif
3509
3510 #ifdef WITH_PROXY
3511                 case RAD_LISTEN_PROXY:
3512                         rad_assert(proxy_fds[this->fd & 0x1f] == -1);
3513                         rad_assert(proxy_listeners[this->fd & 0x1f] == NULL);
3514
3515                         proxy_fds[this->fd & 0x1f] = this->fd;
3516                         proxy_listeners[this->fd & 0x1f] = this;
3517                         if (!fr_packet_list_socket_add(proxy_list,
3518                                                          this->fd)) {
3519                                 rad_assert(0 == 1);
3520                         }
3521                         /* FALL-THROUGH */
3522 #endif
3523
3524                 default:
3525                         break;
3526                 }
3527
3528                 event_new_fd(this);
3529         }
3530
3531         mainconfig.listen = head;
3532
3533         return 1;
3534 }
3535
3536
3537 static int request_hash_cb(UNUSED void *ctx, void *data)
3538 {
3539         REQUEST *request = fr_packet2myptr(REQUEST, packet, data);
3540
3541 #ifdef WITH_PROXY
3542         rad_assert(request->in_proxy_hash == FALSE);
3543 #endif
3544
3545         fr_event_delete(el, &request->ev);
3546         remove_from_request_hash(request);
3547         request_free(&request);
3548
3549         return 0;
3550 }
3551
3552
3553 #ifdef WITH_PROXY
3554 static int proxy_hash_cb(UNUSED void *ctx, void *data)
3555 {
3556         REQUEST *request = fr_packet2myptr(REQUEST, proxy, data);
3557
3558         fr_packet_list_yank(proxy_list, request->proxy);
3559         request->in_proxy_hash = FALSE;
3560
3561         if (!request->in_request_hash) {
3562                 fr_event_delete(el, &request->ev);
3563                 request_free(&request);
3564         }
3565
3566         return 0;
3567 }
3568 #endif
3569
3570 void radius_event_free(void)
3571 {
3572         /*
3573          *      FIXME: Stop all threads, or at least check that
3574          *      they're all waiting on the semaphore, and the queues
3575          *      are empty.
3576          */
3577
3578 #ifdef WITH_PROXY
3579         /*
3580          *      There are requests in the proxy hash that aren't
3581          *      referenced from anywhere else.  Remove them first.
3582          */
3583         if (proxy_list) {
3584                 PTHREAD_MUTEX_LOCK(&proxy_mutex);
3585                 fr_packet_list_walk(proxy_list, NULL, proxy_hash_cb);
3586                 PTHREAD_MUTEX_UNLOCK(&proxy_mutex);
3587                 fr_packet_list_free(proxy_list);
3588                 proxy_list = NULL;
3589         }
3590 #endif
3591
3592         fr_packet_list_walk(pl, NULL, request_hash_cb);
3593
3594         fr_packet_list_free(pl);
3595         pl = NULL;
3596
3597         fr_event_list_free(el);
3598 }
3599
3600 int radius_event_process(void)
3601 {
3602         if (!el) return 0;
3603
3604         return fr_event_loop(el);
3605 }
3606
3607 void radius_handle_request(REQUEST *request, RAD_REQUEST_FUNP fun)
3608 {
3609         request->options = RAD_REQUEST_OPTION_DEBUG2;
3610
3611         if (request_pre_handler(request)) {
3612                 rad_assert(fun != NULL);
3613                 rad_assert(request != NULL);
3614
3615                 if (request->server) RDEBUG("server %s {",
3616                                             request->server != NULL ?
3617                                             request->server : "");
3618                 fun(request);
3619
3620                 if (request->server) RDEBUG("} # server %s",
3621                                              request->server != NULL ?
3622                                             request->server : "");
3623
3624                 request_post_handler(request);
3625         }
3626
3627         DEBUG2("Going to the next request");
3628         return;
3629 }