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 #include <freeradius-devel/radius_snmp.h>
  32
  33 #include <freeradius-devel/rad_assert.h>
  34
  35 #include <signal.h>
  36 #include <fcntl.h>
  37
  38 #ifdef HAVE_SYS_WAIT_H
  39 #       include <sys/wait.h>
  40 #endif
  41
  42 #define USEC (1000000)
  43
  44 extern pid_t radius_pid;
  45 extern int dont_fork;
  46 extern int check_config;
  47 extern void force_log_reopen(void);
  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 static time_t                   start_time;
  57 static int                      have_children;
  58 static int                      has_detail_listener = FALSE;
  59 static int                      just_started = FALSE;
  60
  61 #ifndef __MINGW32__
  62 static int self_pipe[2];
  63 #endif
  64
  65 #ifdef HAVE_PTHREAD_H
  66 static pthread_mutex_t  proxy_mutex;
  67
  68 #define PTHREAD_MUTEX_LOCK if (have_children) pthread_mutex_lock
  69 #define PTHREAD_MUTEX_UNLOCK if (have_children) pthread_mutex_unlock
  70 #else
  71 /*
  72  *      This is easier than ifdef's throughout the code.
  73  */
  74 #define PTHREAD_MUTEX_LOCK(_x)
  75 #define PTHREAD_MUTEX_UNLOCK(_x)
  76 #endif
  77
  78 #define INSERT_EVENT(_function, _ctx) if (!fr_event_insert(el, _function, _ctx, &((_ctx)->when), &((_ctx)->ev))) { _rad_panic(__FILE__, __LINE__, "Failed to insert event"); }
  79
  80 static fr_packet_list_t *proxy_list = NULL;
  81
  82 /*
  83  *      We keep the proxy FD's here.  The RADIUS Id's are marked
  84  *      "allocated" per Id, via a bit per proxy FD.
  85  */
  86 static int              proxy_fds[32];
  87 static rad_listen_t     *proxy_listeners[32];
  88
  89 static void request_post_handler(REQUEST *request);
  90 static void wait_a_bit(void *ctx);
  91 static void event_socket_handler(fr_event_list_t *xel, UNUSED int fd, void *ctx);
  92
  93 static void NEVER_RETURNS _rad_panic(const char *file, unsigned int line,
  94                                     const char *msg)
  95 {
  96         radlog(L_ERR, "[%s:%d] %s", file, line, msg);
  97         _exit(1);
  98 }
  99
 100 #define rad_panic(x) _rad_panic(__FILE__, __LINE__, x)
 101
 102
 103 static void tv_add(struct timeval *tv, int usec_delay)
 104 {
 105         if (usec_delay > USEC) {
 106                 tv->tv_sec += usec_delay / USEC;
 107                 usec_delay %= USEC;
 108         }
 109         tv->tv_usec += usec_delay;
 110
 111         if (tv->tv_usec > USEC) {
 112                 tv->tv_usec -= USEC;
 113                 tv->tv_sec++;
 114         }
 115 }
 116
 117 #ifdef WITH_SNMP
 118 static void snmp_inc_counters(REQUEST *request)
 119 {
 120         if (!request->root->do_snmp) return;
 121
 122         if (request->master_state == REQUEST_COUNTED) return;
 123
 124         if ((request->listener->type != RAD_LISTEN_AUTH) &&
 125             (request->listener->type != RAD_LISTEN_ACCT)) return;
 126
 127         /*
 128          *      Update the SNMP statistics.
 129          *
 130          *      Note that we do NOT do this in a child thread.
 131          *      Instead, we update the stats when a request is
 132          *      deleted, because only the main server thread calls
 133          *      this function, which makes it thread-safe.
 134          */
 135         switch (request->reply->code) {
 136         case PW_AUTHENTICATION_ACK:
 137                 rad_snmp.auth.total_responses++;
 138                 rad_snmp.auth.total_access_accepts++;
 139                 if (request->client && request->client->auth) {
 140                         request->client->auth->accepts++;
 141                 }
 142                 break;
 143
 144         case PW_AUTHENTICATION_REJECT:
 145                 rad_snmp.auth.total_responses++;
 146                 rad_snmp.auth.total_access_rejects++;
 147                 if (request->client && request->client->auth) {
 148                         request->client->auth->rejects++;
 149                 }
 150                 break;
 151
 152         case PW_ACCESS_CHALLENGE:
 153                 rad_snmp.auth.total_responses++;
 154                 rad_snmp.auth.total_access_challenges++;
 155                 if (request->client && request->client->auth) {
 156                         request->client->auth->challenges++;
 157                 }
 158                 break;
 159
 160         case PW_ACCOUNTING_RESPONSE:
 161                 rad_snmp.acct.total_responses++;
 162                 if (request->client && request->client->acct) {
 163                         request->client->acct->responses++;
 164                 }
 165                 break;
 166
 167                 /*
 168                  *      No response, it must have been a bad
 169                  *      authenticator.
 170                  */
 171         case 0:
 172                 if (request->packet->code == PW_AUTHENTICATION_REQUEST) {
 173                         rad_snmp.auth.total_bad_authenticators++;
 174                         if (request->client && request->client->auth) {
 175                                 request->client->auth->bad_authenticators++;
 176                         }
 177                 }
 178                 break;
 179
 180         default:
 181                 break;
 182         }
 183
 184         request->master_state = REQUEST_COUNTED;
 185 }
 186 #else
 187 #define snmp_inc_counters(_x)
 188 #endif
 189
 190
 191 static void remove_from_request_hash(REQUEST *request)
 192 {
 193         if (!request->in_request_hash) return;
 194
 195         fr_packet_list_yank(pl, request->packet);
 196         request->in_request_hash = FALSE;
 197
 198         snmp_inc_counters(request);
 199 }
 200
 201
 202 static REQUEST *lookup_in_proxy_hash(RADIUS_PACKET *reply)
 203 {
 204         RADIUS_PACKET **proxy_p;
 205         REQUEST *request;
 206
 207         PTHREAD_MUTEX_LOCK(&proxy_mutex);
 208         proxy_p = fr_packet_list_find_byreply(proxy_list, reply);
 209
 210         if (!proxy_p) {
 211                 PTHREAD_MUTEX_UNLOCK(&proxy_mutex);
 212                 return NULL;
 213         }
 214
 215         request = fr_packet2myptr(REQUEST, proxy, proxy_p);
 216
 217         if (!request) {
 218                 PTHREAD_MUTEX_UNLOCK(&proxy_mutex);
 219                 return NULL;
 220         }
 221
 222         request->num_proxied_responses++;
 223
 224         /*
 225          *      Catch the most common case of everything working
 226          *      correctly.
 227          */
 228         if (request->num_proxied_requests == request->num_proxied_responses) {
 229                 fr_packet_list_yank(proxy_list, request->proxy);
 230                 fr_packet_list_id_free(proxy_list, request->proxy);
 231                 request->in_proxy_hash = FALSE;
 232         }
 233
 234         /*
 235          *      On the FIRST reply, decrement the count of outstanding
 236          *      requests.  Note that this is NOT the count of sent
 237          *      packets, but whether or not the home server has
 238          *      responded at all.
 239          */
 240         if (!request->proxy_reply &&
 241             request->home_server->currently_outstanding) {
 242                 request->home_server->currently_outstanding--;
 243         }
 244
 245         PTHREAD_MUTEX_UNLOCK(&proxy_mutex);
 246
 247         return request;
 248 }
 249
 250
 251 static void remove_from_proxy_hash(REQUEST *request)
 252 {
 253         if (!request->in_proxy_hash) return;
 254
 255         PTHREAD_MUTEX_LOCK(&proxy_mutex);
 256         fr_packet_list_yank(proxy_list, request->proxy);
 257         fr_packet_list_id_free(proxy_list, request->proxy);
 258
 259         /*
 260          *      The home server hasn't replied, but we've given up on
 261          *      this request.  Don't count this request against the
 262          *      home server.
 263          */
 264         if (!request->proxy_reply &&
 265             request->home_server->currently_outstanding) {
 266                 request->home_server->currently_outstanding--;
 267         }
 268
 269         PTHREAD_MUTEX_UNLOCK(&proxy_mutex);
 270
 271         request->in_proxy_hash = FALSE;
 272 }
 273
 274
 275 static int insert_into_proxy_hash(REQUEST *request)
 276 {
 277         int i, proxy;
 278         char buf[128];
 279
 280         rad_assert(request->proxy != NULL);
 281         rad_assert(proxy_list != NULL);
 282
 283         request->proxy->sockfd = -1;
 284
 285         PTHREAD_MUTEX_LOCK(&proxy_mutex);
 286
 287         request->home_server->currently_outstanding++;
 288         request->home_server->total_requests_sent++;
 289
 290         /*
 291          *      On overflow, back up to ~0.
 292          */
 293         if (!request->home_server->total_requests_sent) {
 294                 request->home_server->total_requests_sent--;
 295         }
 296
 297         if (!fr_packet_list_id_alloc(proxy_list, request->proxy)) {
 298                 int found;
 299                 rad_listen_t *proxy_listener;
 300
 301                 /*
 302                  *      Allocate a new proxy fd.  This function adds
 303                  *      it to the tail of the list of listeners.  With
 304                  *      some care, this can be thread-safe.
 305                  */
 306                 proxy_listener = proxy_new_listener();
 307                 if (!proxy_listener) {
 308                         PTHREAD_MUTEX_UNLOCK(&proxy_mutex);
 309                         DEBUG2("ERROR: Failed to create a new socket for proxying requests.");
 310                         return 0;
 311                 }
 312
 313                 /*
 314                  *      Cache it locally.
 315                  */
 316                 found = -1;
 317                 proxy = proxy_listener->fd;
 318                 for (i = 0; i < 32; i++) {
 319                         /*
 320                          *      Found a free entry.  Save the socket,
 321                          *      and remember where we saved it.
 322                          */
 323                         if (proxy_fds[(proxy + i) & 0x1f] == -1) {
 324                                 found = (proxy + i) & 0x1f;
 325                                 proxy_fds[found] = proxy;
 326                                 proxy_listeners[found] = proxy_listener;
 327                                 break;
 328                         }
 329                 }
 330                 rad_assert(found >= 0);
 331
 332                 if (!fr_packet_list_socket_add(proxy_list, proxy_listener->fd)) {
 333                         PTHREAD_MUTEX_UNLOCK(&proxy_mutex);
 334                         DEBUG2("ERROR: Failed to create a new socket for proxying requests.");
 335                         return 0;
 336
 337                 }
 338
 339                 if (!fr_packet_list_id_alloc(proxy_list, request->proxy)) {
 340                         PTHREAD_MUTEX_UNLOCK(&proxy_mutex);
 341                         DEBUG2("ERROR: Failed to create a new socket for proxying requests.");
 342                         return 0;
 343                 }
 344
 345                 /*
 346                  *      Signal the main thread to add the new FD to the list
 347                  *      of listening FD's.
 348                  */
 349                 radius_signal_self(RADIUS_SIGNAL_SELF_NEW_FD);
 350         }
 351         rad_assert(request->proxy->sockfd >= 0);
 352
 353         /*
 354          *      FIXME: Hack until we get rid of rad_listen_t, and put
 355          *      the information into the packet_list.
 356          */
 357         proxy = -1;
 358         for (i = 0; i < 32; i++) {
 359                 if (proxy_fds[i] == request->proxy->sockfd) {
 360                         proxy = i;
 361                         break;
 362                 }
 363         }
 364
 365         if (proxy < 0) {
 366                 PTHREAD_MUTEX_UNLOCK(&proxy_mutex);
 367                 DEBUG2("ERROR: All sockets are full.");
 368                 return 0;
 369         }
 370
 371         rad_assert(proxy_fds[proxy] != -1);
 372         rad_assert(proxy_listeners[proxy] != NULL);
 373         request->proxy_listener = proxy_listeners[proxy];
 374
 375         if (!fr_packet_list_insert(proxy_list, &request->proxy)) {
 376                 fr_packet_list_id_free(proxy_list, request->proxy);
 377                 PTHREAD_MUTEX_UNLOCK(&proxy_mutex);
 378                 DEBUG2("ERROR: Failed to insert entry into proxy list");
 379                 return 0;
 380         }
 381
 382         PTHREAD_MUTEX_UNLOCK(&proxy_mutex);
 383
 384         DEBUG3(" proxy: allocating destination %s port %d - Id %d",
 385                inet_ntop(request->proxy->dst_ipaddr.af,
 386                          &request->proxy->dst_ipaddr.ipaddr, buf, sizeof(buf)),
 387                request->proxy->dst_port,
 388                request->proxy->id);
 389
 390         request->in_proxy_hash = TRUE;
 391
 392         return 1;
 393 }
 394
 395
 396 /*
 397  *      Called as BOTH an event, and in-line from other functions.
 398  */
 399 static void wait_for_proxy_id_to_expire(void *ctx)
 400 {
 401         REQUEST *request = ctx;
 402         home_server *home = request->home_server;
 403
 404         rad_assert(request->magic == REQUEST_MAGIC);
 405         rad_assert(request->proxy != NULL);
 406
 407         if (!fr_event_now(el, &now)) gettimeofday(&now, NULL);
 408         request->when = request->proxy_when;
 409         request->when.tv_sec += home->response_window;
 410
 411         if ((request->num_proxied_requests == request->num_proxied_responses) ||
 412             timercmp(&now, &request->when, >)) {
 413                 if (request->packet) {
 414                         DEBUG2("Cleaning up request %d ID %d with timestamp +%d",
 415                                request->number, request->packet->id,
 416                                (unsigned int) (request->timestamp - start_time));
 417                 } else {
 418                         DEBUG2("Cleaning up request %d with timestamp +%d",
 419                                request->number,
 420                                (unsigned int) (request->timestamp - start_time));
 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
 432
 433 static void wait_for_child_to_die(void *ctx)
 434 {
 435         REQUEST *request = ctx;
 436
 437         rad_assert(request->magic == REQUEST_MAGIC);
 438
 439         if ((request->child_state == REQUEST_QUEUED) |
 440             (request->child_state == REQUEST_RUNNING)) {
 441                 request->delay += (request->delay >> 1);
 442                 tv_add(&request->when, request->delay);
 443
 444                 DEBUG2("Child is still stuck for request %d", request->number);
 445
 446                 INSERT_EVENT(wait_for_child_to_die, request);
 447                 return;
 448         }
 449
 450         DEBUG2("Child is finally responsive for request %d", request->number);
 451         remove_from_request_hash(request);
 452
 453         if (request->proxy) {
 454                 wait_for_proxy_id_to_expire(request);
 455                 return;
 456         }
 457
 458         request_free(&request);
 459 }
 460
 461
 462 static void cleanup_delay(void *ctx)
 463 {
 464         REQUEST *request = ctx;
 465
 466         rad_assert(request->magic == REQUEST_MAGIC);
 467         rad_assert((request->child_state == REQUEST_CLEANUP_DELAY) ||
 468                    (request->child_state == REQUEST_DONE));
 469
 470         remove_from_request_hash(request);
 471
 472         if (request->proxy && request->in_proxy_hash) {
 473                 wait_for_proxy_id_to_expire(request);
 474                 return;
 475         }
 476
 477         DEBUG2("Cleaning up request %d ID %d with timestamp +%d",
 478                request->number, request->packet->id,
 479                (unsigned int) (request->timestamp - start_time));
 480
 481         fr_event_delete(el, &request->ev);
 482         request_free(&request);
 483 }
 484
 485
 486 static void reject_delay(void *ctx)
 487 {
 488         REQUEST *request = ctx;
 489
 490         rad_assert(request->magic == REQUEST_MAGIC);
 491         rad_assert(request->child_state == REQUEST_REJECT_DELAY);
 492
 493         DEBUG2("Sending delayed reject for request %d", request->number);
 494
 495         request->listener->send(request->listener, request);
 496
 497         request->when.tv_sec += request->root->cleanup_delay;
 498         request->child_state = REQUEST_CLEANUP_DELAY;
 499
 500         INSERT_EVENT(cleanup_delay, request);
 501 }
 502
 503
 504 static void revive_home_server(void *ctx)
 505 {
 506         home_server *home = ctx;
 507
 508         home->state = HOME_STATE_ALIVE;
 509         DEBUG2("Marking home server alive again... we have no idea if it really is alive or not.");
 510         home->currently_outstanding = 0;
 511 }
 512
 513
 514 static void no_response_to_ping(void *ctx)
 515 {
 516         REQUEST *request = ctx;
 517         home_server *home = request->home_server;
 518         char buffer[128];
 519
 520         home->num_received_pings = 0;
 521
 522         DEBUG2("No response to status check %d from home server %s port %d",
 523                request->number,
 524                inet_ntop(request->proxy->dst_ipaddr.af,
 525                          &request->proxy->dst_ipaddr.ipaddr,
 526                          buffer, sizeof(buffer)),
 527                request->proxy->dst_port);
 528
 529         wait_for_proxy_id_to_expire(request);
 530 }
 531
 532
 533 static void received_response_to_ping(REQUEST *request)
 534 {
 535         home_server *home = request->home_server;
 536         char buffer[128];
 537
 538         home->num_received_pings++;
 539
 540         DEBUG2("Received response to status check %d (%d in current sequence)",
 541                request->number, home->num_received_pings);
 542
 543         if (home->num_received_pings < home->num_pings_to_alive) {
 544                 wait_for_proxy_id_to_expire(request);
 545                 return;
 546         }
 547
 548         DEBUG2("Marking home server %s port %d alive",
 549                inet_ntop(request->proxy->dst_ipaddr.af,
 550                          &request->proxy->dst_ipaddr.ipaddr,
 551                          buffer, sizeof(buffer)),
 552                request->proxy->dst_port);
 553
 554         if (!fr_event_delete(el, &home->ev)) {
 555                 DEBUG2("Hmm... no event for home server, WTF?");
 556         }
 557
 558         if (!fr_event_delete(el, &request->ev)) {
 559                 DEBUG2("Hmm... no event for request, WTF?");
 560         }
 561
 562         wait_for_proxy_id_to_expire(request);
 563
 564         home->state = HOME_STATE_ALIVE;
 565         home->currently_outstanding = 0;
 566 }
 567
 568
 569 static void ping_home_server(void *ctx)
 570 {
 571         uint32_t jitter;
 572         home_server *home = ctx;
 573         REQUEST *request;
 574         VALUE_PAIR *vp;
 575
 576         if (home->state == HOME_STATE_ALIVE) {
 577                 radlog(L_INFO, "Suspicious proxy state... continuing");
 578                 return;
 579         }
 580
 581         request = request_alloc();
 582         request->number = request_num_counter++;
 583
 584         request->proxy = rad_alloc(1);
 585         rad_assert(request->proxy != NULL);
 586
 587         fr_event_now(el, &request->when);
 588         home->when = request->when;
 589
 590         if (home->ping_check == HOME_PING_CHECK_STATUS_SERVER) {
 591                 request->proxy->code = PW_STATUS_SERVER;
 592
 593                 radius_pairmake(request, &request->proxy->vps,
 594                                 "Message-Authenticator", "0x00", T_OP_SET);
 595
 596         } else if (home->type == HOME_TYPE_AUTH) {
 597                 request->proxy->code = PW_AUTHENTICATION_REQUEST;
 598
 599                 radius_pairmake(request, &request->proxy->vps,
 600                                 "User-Name", home->ping_user_name, T_OP_SET);
 601                 radius_pairmake(request, &request->proxy->vps,
 602                                 "User-Password", home->ping_user_password, T_OP_SET);
 603                 radius_pairmake(request, &request->proxy->vps,
 604                                 "Service-Type", "Authenticate-Only", T_OP_SET);
 605                 radius_pairmake(request, &request->proxy->vps,
 606                                 "Message-Authenticator", "0x00", T_OP_SET);
 607
 608         } else {
 609                 request->proxy->code = PW_ACCOUNTING_REQUEST;
 610
 611                 radius_pairmake(request, &request->proxy->vps,
 612                                 "User-Name", home->ping_user_name, T_OP_SET);
 613                 radius_pairmake(request, &request->proxy->vps,
 614                                 "Acct-Status-Type", "Stop", T_OP_SET);
 615                 radius_pairmake(request, &request->proxy->vps,
 616                                 "Acct-Session-Id", "00000000", T_OP_SET);
 617                 vp = radius_pairmake(request, &request->proxy->vps,
 618                                      "Event-Timestamp", "0", T_OP_SET);
 619                 vp->vp_date = now.tv_sec;
 620         }
 621
 622         radius_pairmake(request, &request->proxy->vps,
 623                         "NAS-Identifier", "Status Check. Are you alive?",
 624                         T_OP_SET);
 625
 626         request->proxy->dst_ipaddr = home->ipaddr;
 627         request->proxy->dst_port = home->port;
 628         request->home_server = home;
 629
 630         rad_assert(request->proxy_listener == NULL);
 631
 632         if (!insert_into_proxy_hash(request)) {
 633                 DEBUG2("ERROR: Failed inserting status check %d into proxy hash.  Discarding it.",
 634                        request->number);
 635                 request_free(&request);
 636                 return;
 637         }
 638         rad_assert(request->proxy_listener != NULL);
 639         request->proxy_listener->send(request->proxy_listener,
 640                                       request);
 641
 642         request->next_callback = NULL;
 643         request->child_state = REQUEST_PROXIED;
 644         request->when.tv_sec += home->ping_timeout;;
 645
 646         INSERT_EVENT(no_response_to_ping, request);
 647
 648         /*
 649          *      Add +/- 2s of jitter, as suggested in RFC 3539
 650          *      and in the Issues and Fixes draft.
 651          */
 652         home->when.tv_sec += home->ping_interval - 2;
 653
 654         jitter = fr_rand();
 655         jitter ^= (jitter >> 10);
 656         jitter &= ((1 << 23) - 1); /* 22 bits of 1 */
 657
 658         tv_add(&home->when, jitter);
 659
 660
 661         INSERT_EVENT(ping_home_server, home);
 662 }
 663
 664
 665 static void check_for_zombie_home_server(REQUEST *request)
 666 {
 667         home_server *home;
 668         struct timeval when;
 669         char buffer[128];
 670
 671         home = request->home_server;
 672
 673         if (home->state != HOME_STATE_ZOMBIE) return;
 674
 675         when = home->zombie_period_start;
 676         when.tv_sec += home->zombie_period;
 677
 678         fr_event_now(el, &now);
 679         if (timercmp(&now, &when, <)) {
 680                 return;
 681         }
 682
 683         /*
 684          *      It's been a zombie for too long, mark it as
 685          *      dead.
 686          */
 687         DEBUG2("FAILURE: Marking home server %s port %d as dead.",
 688                inet_ntop(request->proxy->dst_ipaddr.af,
 689                          &request->proxy->dst_ipaddr.ipaddr,
 690                          buffer, sizeof(buffer)),
 691                request->proxy->dst_port);
 692         home->state = HOME_STATE_IS_DEAD;
 693         home->num_received_pings = 0;
 694         home->when = request->when;
 695
 696         if (home->ping_check != HOME_PING_CHECK_NONE) {
 697                 rad_assert((home->ping_check == HOME_PING_CHECK_STATUS_SERVER) ||
 698                            (home->ping_user_name != NULL));
 699                 home->when.tv_sec += home->ping_interval;
 700
 701                 INSERT_EVENT(ping_home_server, home);
 702         } else {
 703                 home->when.tv_sec += home->revive_interval;
 704
 705                 INSERT_EVENT(revive_home_server, home);
 706         }
 707 }
 708
 709
 710 static int setup_post_proxy_fail(REQUEST *request)
 711 {
 712         DICT_VALUE *dval = NULL;
 713         VALUE_PAIR *vp;
 714
 715         if (request->packet->code == PW_AUTHENTICATION_REQUEST) {
 716                 dval = dict_valbyname(PW_POST_PROXY_TYPE, "Fail-Authentication");
 717
 718         } else if (request->packet->code == PW_ACCOUNTING_REQUEST) {
 719                 dval = dict_valbyname(PW_POST_PROXY_TYPE, "Fail-Accounting");
 720
 721         } else {
 722                 return 0;
 723         }
 724
 725         if (!dval) dval = dict_valbyname(PW_POST_PROXY_TYPE, "Fail");
 726
 727         if (!dval) {
 728                 pairdelete(&request->config_items, PW_POST_PROXY_TYPE);
 729                 return 0;
 730         }
 731
 732         vp = pairfind(request->config_items, PW_POST_PROXY_TYPE);
 733         if (!vp) vp = radius_paircreate(request, &request->config_items,
 734                                         PW_POST_PROXY_TYPE, PW_TYPE_INTEGER);
 735         vp->vp_integer = dval->value;
 736
 737         rad_assert(request->proxy_reply == NULL);
 738
 739         return 1;
 740 }
 741
 742
 743 static int null_handler(UNUSED REQUEST *request)
 744 {
 745         return 0;
 746 }
 747
 748 static void post_proxy_fail_handler(REQUEST *request)
 749 {
 750         /*
 751          *      A proper time is required for wait_a_bit.
 752          */
 753         request->delay = USEC / 10;
 754         gettimeofday(&now, NULL);
 755
 756         /*
 757          *      Not set up to run Post-Proxy-Type = Fail.
 758          *
 759          *      Mark the request as still running, and figure out what
 760          *      to do next.
 761          */
 762         if (!setup_post_proxy_fail(request)) {
 763                 request->child_state = REQUEST_RUNNING;
 764                 request_post_handler(request);
 765
 766         } else {
 767                 /*
 768                  *      Re-queue the request.
 769                  */
 770                 request->child_state = REQUEST_QUEUED;
 771
 772                 /*
 773                  *      There is a post-proxy-type of fail.  We run
 774                  *      the request through the pre/post proxy
 775                  *      handlers, just like it was a real proxied
 776                  *      request.  However, we set the per-request
 777                  *      handler to NULL, as we don't want to do
 778                  *      anything else.
 779                  *
 780                  *      Note that when we're not threaded, this will
 781                  *      process the request even if it's greater than
 782                  *      max_request_time.  That's not fatal.
 783                  */
 784                 request->priority = 0;
 785                 rad_assert(request->proxy != NULL);
 786                 thread_pool_addrequest(request, null_handler);
 787
 788         }
 789
 790         /*
 791          *      MAY free the request if we're over max_request_time,
 792          *      AND we're not in threaded mode!
 793          *
 794          *      Note that we call this ONLY if we're threaded, as
 795          *      if we're NOT threaded, request_post_handler() calls
 796          *      wait_a_bit(), which means that "request" may not
 797          *      exist any more...
 798          */
 799         if (have_children) wait_a_bit(request);
 800 }
 801
 802
 803 /* maybe check this against wait_for_proxy_id_to_expire? */
 804 static void no_response_to_proxied_request(void *ctx)
 805 {
 806         REQUEST *request = ctx;
 807         home_server *home;
 808         char buffer[128];
 809
 810         rad_assert(request->magic == REQUEST_MAGIC);
 811         rad_assert(request->child_state == REQUEST_PROXIED);
 812
 813         radlog(L_ERR, "Rejecting request %d due to lack of any response from home server %s port %d",
 814                request->number,
 815                inet_ntop(request->proxy->dst_ipaddr.af,
 816                          &request->proxy->dst_ipaddr.ipaddr,
 817                          buffer, sizeof(buffer)),
 818                request->proxy->dst_port);
 819
 820         check_for_zombie_home_server(request);
 821
 822         home = request->home_server;
 823
 824         post_proxy_fail_handler(request);
 825
 826         /*
 827          *      Don't touch request due to race conditions
 828          */
 829         if (home->state == HOME_STATE_IS_DEAD) {
 830                 rad_assert(home->ev != NULL); /* or it will never wake up */
 831                 return;
 832         }
 833
 834         /*
 835          *      Enable the zombie period when we notice that the home
 836          *      server hasn't responded.  We also back-date the start
 837          *      of the zombie period to when the proxied request was
 838          *      sent.
 839          */
 840         if (home->state == HOME_STATE_ALIVE) {
 841                 DEBUG2("WARNING: Marking home server %s port %d as zombie (it looks like it is dead).",
 842                        inet_ntop(home->ipaddr.af, &home->ipaddr.ipaddr,
 843                                  buffer, sizeof(buffer)),
 844                        home->port);
 845                 home->state = HOME_STATE_ZOMBIE;
 846                 home->zombie_period_start = now;
 847                 home->zombie_period_start.tv_sec -= home->response_window;
 848                 return;
 849         }
 850 }
 851
 852
 853 static void wait_a_bit(void *ctx)
 854 {
 855         struct timeval when;
 856         REQUEST *request = ctx;
 857         fr_event_callback_t callback = NULL;
 858
 859         rad_assert(request->magic == REQUEST_MAGIC);
 860
 861         switch (request->child_state) {
 862         case REQUEST_QUEUED:
 863         case REQUEST_RUNNING:
 864                 when = request->received;
 865                 when.tv_sec += request->root->max_request_time;
 866
 867                 /*
 868                  *      Normally called from the event loop with the
 869                  *      proper event loop time.  Otherwise, called from
 870                  *      post proxy fail handler, which sets "now", and
 871                  *      this call won't re-set it, because we're not
 872                  *      in the event loop.
 873                  */
 874                 fr_event_now(el, &now);
 875
 876                 /*
 877                  *      Request still has more time.  Continue
 878                  *      waiting.
 879                  */
 880                 if (timercmp(&now, &when, <) ||
 881                     ((request->listener->type == RAD_LISTEN_DETAIL) &&
 882                      (request->child_state == REQUEST_QUEUED))) {
 883                         if (request->delay < (USEC / 10)) {
 884                                 request->delay = USEC / 10;
 885                         }
 886                         request->delay += request->delay >> 1;
 887
 888                         /*
 889                          *      Cap wait at some sane value for detail
 890                          *      files.
 891                          */
 892                         if ((request->listener->type == RAD_LISTEN_DETAIL) &&
 893                             (request->delay > (request->root->max_request_time * USEC))) {
 894                                 request->delay = request->root->max_request_time * USEC;
 895                         }
 896
 897                         request->when = now;
 898                         tv_add(&request->when, request->delay);
 899                         callback = wait_a_bit;
 900                         break;
 901                 }
 902
 903                 /*
 904                  *      A child thread MAY still be running on the
 905                  *      request.  Ask the thread to stop working on
 906                  *      the request.
 907                  */
 908                 if (have_children) {
 909                         /* FIXME: kill unresponsive children? */
 910
 911                         /*
 912                          *      Print this error message ONLY if
 913                          *      there's a child currently processing
 914                          *      the request.  As we don't have thread
 915                          *      locks here, there may be race
 916                          *      conditions on this check.  But it's
 917                          *      just an error message, so that's OK.
 918                          */
 919                         if (request->child_pid != NO_SUCH_CHILD_PID) {
 920                                 radlog(L_ERR, "WARNING: Unresponsive child (id %lu) for request %d, in module %s component %s",
 921                                (unsigned long)request->child_pid, request->number,
 922                                        request->module ? request->module : "<server core>",
 923                                        request->component ? request->component : "<server core>");
 924                         }
 925
 926                         request->master_state = REQUEST_STOP_PROCESSING;
 927
 928                         request->delay = USEC / 4;
 929                         tv_add(&request->when, request->delay);
 930                         callback = wait_for_child_to_die;
 931                         break;
 932                 }
 933
 934                 /*
 935                  *      Else there are no child threads.  We probably
 936                  *      should have just marked the request as 'done'
 937                  *      elsewhere, like in the post-proxy-fail
 938                  *      handler.  But doing that would involve
 939                  *      checking for max_request_time in multiple
 940                  *      places, so this may be simplest.
 941                  */
 942                 request->child_state = REQUEST_DONE;
 943                 /* FALL-THROUGH */
 944
 945                 /*
 946                  *      Mark the request as no longer running,
 947                  *      and clean it up.
 948                  */
 949         case REQUEST_DONE:
 950                 request->child_pid = NO_SUCH_CHILD_PID;
 951                 snmp_inc_counters(request);
 952                 cleanup_delay(request);
 953                 return;
 954
 955         case REQUEST_REJECT_DELAY:
 956         case REQUEST_CLEANUP_DELAY:
 957                 request->child_pid = NO_SUCH_CHILD_PID;
 958                 snmp_inc_counters(request);
 959
 960         case REQUEST_PROXIED:
 961                 rad_assert(request->next_callback != NULL);
 962                 rad_assert(request->next_callback != wait_a_bit);
 963
 964                 request->when = request->next_when;
 965                 callback = request->next_callback;
 966                 request->next_callback = NULL;
 967                 break;
 968
 969         default:
 970                 rad_panic("Internal sanity check failure");
 971                 return;
 972         }
 973
 974         /*
 975          *      Something major went wrong.  Discard the request, and
 976          *      keep running.
 977          *
 978          *      FIXME: No idea why this happens or how to fix it...
 979          *      It seems to happen *only* when requests are proxied,
 980          *      and where the home server doesn't respond.  So it looks
 981          *      like a race condition above, but it happens in debug
 982          *      mode, with no threads...
 983          */
 984         if (!callback) {
 985                 DEBUG("WARNING: Internal sanity check failed in event handler for request %d: Discarding the request!", request->number);
 986                 fr_event_delete(el, &request->ev);
 987                 remove_from_proxy_hash(request);
 988                 remove_from_request_hash(request);
 989                 request_free(&request);
 990                 return;
 991         }
 992
 993         INSERT_EVENT(callback, request);
 994 }
 995
 996
 997 static int request_pre_handler(REQUEST *request)
 998 {
 999         int rcode;
1000
1001         rad_assert(request->magic == REQUEST_MAGIC);
1002         rad_assert(request->packet != NULL);
1003
1004         request->child_state = REQUEST_RUNNING;
1005
1006         /*
1007          *      Don't decode the packet if it's an internal "fake"
1008          *      request.  Instead, just return so that the caller can
1009          *      process it.
1010          */
1011         if (request->packet->dst_port == 0) {
1012                 request->username = pairfind(request->packet->vps,
1013                                              PW_USER_NAME);
1014                 request->password = pairfind(request->packet->vps,
1015                                              PW_USER_PASSWORD);
1016                 return 1;
1017         }
1018
1019         /*
1020          *      Put the decoded packet into it's proper place.
1021          */
1022         if (request->proxy_reply != NULL) {
1023                 rcode = request->proxy_listener->decode(request->proxy_listener,
1024                                                         request);
1025         } else if (request->packet->vps == NULL) {
1026                 rcode = request->listener->decode(request->listener, request);
1027
1028         } else {
1029                 rcode = 0;
1030         }
1031
1032         if (rcode < 0) {
1033                 radlog(L_ERR, "%s Dropping packet without response.", librad_errstr);
1034                 request->child_state = REQUEST_DONE;
1035                 return 0;
1036         }
1037
1038         if (!request->proxy) {
1039                 request->username = pairfind(request->packet->vps,
1040                                              PW_USER_NAME);
1041
1042         } else {
1043                 int post_proxy_type = 0;
1044                 VALUE_PAIR *vp;
1045
1046                 /*
1047                  *      Delete any reply we had accumulated until now.
1048                  */
1049                 pairfree(&request->reply->vps);
1050
1051                 /*
1052                  *      Run the packet through the post-proxy stage,
1053                  *      BEFORE playing games with the attributes.
1054                  */
1055                 vp = pairfind(request->config_items, PW_POST_PROXY_TYPE);
1056                 if (vp) {
1057                         DEBUG2("  Found Post-Proxy-Type %s", vp->vp_strvalue);
1058                         post_proxy_type = vp->vp_integer;
1059                 }
1060
1061                 rad_assert(request->home_pool != NULL);
1062
1063                 if (request->home_pool->virtual_server) {
1064                         const char *old_server = request->server;
1065
1066                         request->server = request->home_pool->virtual_server;
1067                         DEBUG2(" server %s {", request->server);
1068                         rcode = module_post_proxy(post_proxy_type, request);
1069                         DEBUG2(" }");
1070                         request->server = old_server;
1071                 } else {
1072                         rcode = module_post_proxy(post_proxy_type, request);
1073                 }
1074
1075                 /*
1076                  *      There may NOT be a proxy reply, as we may be
1077                  *      running Post-Proxy-Type = Fail.
1078                  */
1079                 if (request->proxy_reply) {
1080                         /*
1081                          *      Delete the Proxy-State Attributes from
1082                          *      the reply.  These include Proxy-State
1083                          *      attributes from us and remote server.
1084                          */
1085                         pairdelete(&request->proxy_reply->vps, PW_PROXY_STATE);
1086
1087                         /*
1088                          *      Add the attributes left in the proxy
1089                          *      reply to the reply list.
1090                          */
1091                         pairadd(&request->reply->vps, request->proxy_reply->vps);
1092                         request->proxy_reply->vps = NULL;
1093
1094                         /*
1095                          *      Free proxy request pairs.
1096                          */
1097                         pairfree(&request->proxy->vps);
1098                 }
1099
1100                 switch (rcode) {
1101                 default:  /* Don't do anything */
1102                         break;
1103                 case RLM_MODULE_FAIL:
1104                         /* FIXME: debug print stuff */
1105                         request->child_state = REQUEST_DONE;
1106                         return 0;
1107
1108                 case RLM_MODULE_HANDLED:
1109                         /* FIXME: debug print stuff */
1110                         request->child_state = REQUEST_DONE;
1111                         return 0;
1112                 }
1113         }
1114
1115         return 1;
1116 }
1117
1118
1119 /*
1120  *      Do state handling when we proxy a request.
1121  */
1122 static int proxy_request(REQUEST *request)
1123 {
1124         struct timeval when;
1125         char buffer[128];
1126
1127         if (!insert_into_proxy_hash(request)) {
1128                 DEBUG("ERROR: Failed inserting request into proxy hash.");
1129                 return 0;
1130         }
1131
1132         request->proxy_listener->encode(request->proxy_listener, request);
1133
1134         when = request->received;
1135         when.tv_sec += request->root->max_request_time;
1136
1137         gettimeofday(&request->proxy_when, NULL);
1138
1139         request->next_when = request->proxy_when;
1140         request->next_when.tv_sec += request->home_server->response_window;
1141
1142         rad_assert(request->home_server->response_window > 0);
1143
1144         if (timercmp(&when, &request->next_when, <)) {
1145                 request->next_when = when;
1146         }
1147         request->next_callback = no_response_to_proxied_request;
1148
1149         DEBUG2("Proxying request %d to home server %s port %d",
1150                request->number,
1151                inet_ntop(request->proxy->dst_ipaddr.af,
1152                          &request->proxy->dst_ipaddr.ipaddr,
1153                          buffer, sizeof(buffer)),
1154                request->proxy->dst_port);
1155
1156         /*
1157          *      Note that we set proxied BEFORE sending the packet.
1158          *
1159          *      Once we send it, the request is tainted, as
1160          *      another thread may have picked it up.  Don't
1161          *      touch it!
1162          */
1163         request->num_proxied_requests = 1;
1164         request->num_proxied_responses = 0;
1165         request->child_pid = NO_SUCH_CHILD_PID;
1166         request->child_state = REQUEST_PROXIED;
1167         request->proxy_listener->send(request->proxy_listener,
1168                                       request);
1169         return 1;
1170 }
1171
1172
1173 /*
1174  *      "Proxy" the request by sending it to a new virtual server.
1175  */
1176 static int proxy_to_virtual_server(REQUEST *request)
1177 {
1178         REQUEST *fake;
1179
1180         if (!request->home_server || !request->home_server->server) return 0;
1181
1182         if (request->parent) {
1183                 DEBUG2("WARNING: Cancelling proxy request to virtual server %s as this request was itself proxied.", request->home_server->server);
1184                 return 0;
1185         }
1186
1187         fake = request_alloc_fake(request);
1188         if (!fake) {
1189                 DEBUG2("WARNING: Out of memory");
1190                 return 0;
1191         }
1192
1193         fake->packet->vps = paircopy(request->proxy->vps);
1194         fake->server = request->home_server->server;
1195
1196         DEBUG2(">>> Sending proxied request internally to virtual server.");
1197         radius_handle_request(fake, rad_authenticate);
1198         DEBUG2("<<< Received proxied response from internal virtual server.");
1199
1200         request->proxy_reply = fake->reply;
1201         fake->reply = NULL;
1202
1203         /*
1204          *      And run it through the post-proxy section...
1205          */
1206         rad_authenticate(request);
1207
1208         return 2;               /* success, but NOT '1' !*/
1209 }
1210
1211
1212 /*
1213  *      Return 1 if we did proxy it, or the proxy attempt failed
1214  *      completely.  Either way, the caller doesn't touch the request
1215  *      any more if we return 1.
1216  */
1217 static int successfully_proxied_request(REQUEST *request)
1218 {
1219         int rcode;
1220         int pre_proxy_type = 0;
1221         VALUE_PAIR *realmpair;
1222         VALUE_PAIR *strippedname;
1223         VALUE_PAIR *vp;
1224         char *realmname;
1225         home_server *home;
1226         REALM *realm = NULL;
1227         home_pool_t *pool;
1228
1229         /*
1230          *      If it was already proxied, do nothing.
1231          *
1232          *      FIXME: This should really be a serious error.
1233          */
1234         if (request->in_proxy_hash) {
1235                 return 0;
1236         }
1237
1238         realmpair = pairfind(request->config_items, PW_PROXY_TO_REALM);
1239         if (!realmpair || (realmpair->length == 0)) {
1240                 return 0;
1241         }
1242
1243         realmname = (char *) realmpair->vp_strvalue;
1244
1245         realm = realm_find(realmname);
1246         if (!realm) {
1247                 DEBUG2("ERROR: Cannot proxy to unknown realm %s", realmname);
1248                 return 0;
1249         }
1250
1251         /*
1252          *      Figure out which pool to use.
1253          */
1254         if (request->packet->code == PW_AUTHENTICATION_REQUEST) {
1255                 pool = realm->auth_pool;
1256
1257         } else if (request->packet->code == PW_ACCOUNTING_REQUEST) {
1258                 pool = realm->acct_pool;
1259
1260         } else {
1261                 rad_panic("Internal sanity check failed");
1262         }
1263
1264         if (!pool) {
1265                 DEBUG2(" WARNING: Cancelling proxy to Realm %s, as the realm is local.",
1266                        realmname);
1267                 return 0;
1268         }
1269
1270         home = home_server_ldb(realmname, pool, request);
1271         if (!home) {
1272                 DEBUG2("ERROR: Failed to find live home server for realm %s",
1273                        realmname);
1274                 return -1;
1275         }
1276         request->home_pool = pool;
1277
1278         /*
1279          *      Remember that we sent the request to a Realm.
1280          */
1281         pairadd(&request->packet->vps,
1282                 pairmake("Realm", realmname, T_OP_EQ));
1283
1284         /*
1285          *      We read the packet from a detail file, AND it came from
1286          *      the server we're about to send it to.  Don't do that.
1287          */
1288         if ((request->packet->code == PW_ACCOUNTING_REQUEST) &&
1289             (request->listener->type == RAD_LISTEN_DETAIL) &&
1290             (home->ipaddr.af == AF_INET) &&
1291             (request->packet->src_ipaddr.af == AF_INET) &&
1292             (home->ipaddr.ipaddr.ip4addr.s_addr == request->packet->src_ipaddr.ipaddr.ip4addr.s_addr)) {
1293                 DEBUG2("    rlm_realm: Packet came from realm %s, proxy cancelled", realmname);
1294                 return 0;
1295         }
1296
1297         /*
1298          *      Allocate the proxy packet, only if it wasn't already
1299          *      allocated by a module.  This check is mainly to support
1300          *      the proxying of EAP-TTLS and EAP-PEAP tunneled requests.
1301          *
1302          *      In those cases, the EAP module creates a "fake"
1303          *      request, and recursively passes it through the
1304          *      authentication stage of the server.  The module then
1305          *      checks if the request was supposed to be proxied, and
1306          *      if so, creates a proxy packet from the TUNNELED request,
1307          *      and not from the EAP request outside of the tunnel.
1308          *
1309          *      The proxy then works like normal, except that the response
1310          *      packet is "eaten" by the EAP module, and encapsulated into
1311          *      an EAP packet.
1312          */
1313         if (!request->proxy) {
1314                 if ((request->proxy = rad_alloc(TRUE)) == NULL) {
1315                         radlog(L_ERR|L_CONS, "no memory");
1316                         exit(1);
1317                 }
1318
1319                 /*
1320                  *      Copy the request, then look up name and
1321                  *      plain-text password in the copy.
1322                  *
1323                  *      Note that the User-Name attribute is the
1324                  *      *original* as sent over by the client.  The
1325                  *      Stripped-User-Name attribute is the one hacked
1326                  *      through the 'hints' file.
1327                  */
1328                 request->proxy->vps =  paircopy(request->packet->vps);
1329         }
1330
1331         /*
1332          *      Strip the name, if told to.
1333          *
1334          *      Doing it here catches the case of proxied tunneled
1335          *      requests.
1336          */
1337         if (realm->striprealm == TRUE &&
1338            (strippedname = pairfind(request->proxy->vps, PW_STRIPPED_USER_NAME)) != NULL) {
1339                 /*
1340                  *      If there's a Stripped-User-Name attribute in
1341                  *      the request, then use THAT as the User-Name
1342                  *      for the proxied request, instead of the
1343                  *      original name.
1344                  *
1345                  *      This is done by making a copy of the
1346                  *      Stripped-User-Name attribute, turning it into
1347                  *      a User-Name attribute, deleting the
1348                  *      Stripped-User-Name and User-Name attributes
1349                  *      from the vps list, and making the new
1350                  *      User-Name the head of the vps list.
1351                  */
1352                 vp = pairfind(request->proxy->vps, PW_USER_NAME);
1353                 if (!vp) {
1354                         vp = radius_paircreate(request, NULL,
1355                                                PW_USER_NAME, PW_TYPE_STRING);
1356                         rad_assert(vp != NULL); /* handled by above function */
1357                         /* Insert at the START of the list */
1358                         vp->next = request->proxy->vps;
1359                         request->proxy->vps = vp;
1360                 }
1361                 memcpy(vp->vp_strvalue, strippedname->vp_strvalue,
1362                        sizeof(vp->vp_strvalue));
1363                 vp->length = strippedname->length;
1364
1365                 /*
1366                  *      Do NOT delete Stripped-User-Name.
1367                  */
1368         }
1369
1370         /*
1371          *      If there is no PW_CHAP_CHALLENGE attribute but
1372          *      there is a PW_CHAP_PASSWORD we need to add it
1373          *      since we can't use the request authenticator
1374          *      anymore - we changed it.
1375          */
1376         if (pairfind(request->proxy->vps, PW_CHAP_PASSWORD) &&
1377             pairfind(request->proxy->vps, PW_CHAP_CHALLENGE) == NULL) {
1378                 vp = radius_paircreate(request, &request->proxy->vps,
1379                                        PW_CHAP_CHALLENGE, PW_TYPE_OCTETS);
1380                 vp->length = AUTH_VECTOR_LEN;
1381                 memcpy(vp->vp_strvalue, request->packet->vector, AUTH_VECTOR_LEN);
1382         }
1383
1384         /*
1385          *      The RFC's say we have to do this, but FreeRADIUS
1386          *      doesn't need it.
1387          */
1388         vp = radius_paircreate(request, &request->proxy->vps,
1389                                PW_PROXY_STATE, PW_TYPE_OCTETS);
1390         snprintf(vp->vp_strvalue, sizeof(vp->vp_strvalue), "%d",
1391                  request->packet->id);
1392         vp->length = strlen(vp->vp_strvalue);
1393
1394         /*
1395          *      Should be done BEFORE inserting into proxy hash, as
1396          *      pre-proxy may use this information, or change it.
1397          */
1398         request->proxy->code = request->packet->code;
1399         request->proxy->dst_ipaddr = home->ipaddr;
1400         request->proxy->dst_port = home->port;
1401         request->home_server = home;
1402
1403         /*
1404          *      Call the pre-proxy routines.
1405          */
1406         vp = pairfind(request->config_items, PW_PRE_PROXY_TYPE);
1407         if (vp) {
1408                 DEBUG2("  Found Pre-Proxy-Type %s", vp->vp_strvalue);
1409                 pre_proxy_type = vp->vp_integer;
1410         }
1411
1412         rad_assert(request->home_pool != NULL);
1413
1414         if (request->home_pool->virtual_server) {
1415                 const char *old_server = request->server;
1416
1417                 request->server = request->home_pool->virtual_server;
1418                 DEBUG2(" server %s {", request->server);
1419                 rcode = module_pre_proxy(pre_proxy_type, request);
1420                 DEBUG2(" }");
1421                         request->server = old_server;
1422         } else {
1423                 rcode = module_pre_proxy(pre_proxy_type, request);
1424         }
1425         switch (rcode) {
1426         case RLM_MODULE_FAIL:
1427         case RLM_MODULE_INVALID:
1428         case RLM_MODULE_NOTFOUND:
1429         case RLM_MODULE_USERLOCK:
1430         default:
1431                 /* FIXME: debug print failed stuff */
1432                 return -1;
1433
1434         case RLM_MODULE_REJECT:
1435         case RLM_MODULE_HANDLED:
1436                 return 0;
1437
1438         /*
1439          *      Only proxy the packet if the pre-proxy code succeeded.
1440          */
1441         case RLM_MODULE_NOOP:
1442         case RLM_MODULE_OK:
1443         case RLM_MODULE_UPDATED:
1444                 break;
1445         }
1446
1447         /*
1448          *      If it's a fake request, don't send the proxy
1449          *      packet.  The outer tunnel session will take
1450          *      care of doing that.
1451          */
1452         if (request->packet->dst_port == 0) {
1453                 request->home_server = NULL;
1454                 return 1;
1455         }
1456
1457         if (request->home_server->server) {
1458                 return proxy_to_virtual_server(request);
1459         }
1460
1461         if (!proxy_request(request)) {
1462                 DEBUG("ERROR: Failed to proxy request %d", request->number);
1463                 return -1;
1464         }
1465
1466         return 1;
1467 }
1468
1469
1470 static void request_post_handler(REQUEST *request)
1471 {
1472         int child_state = -1;
1473         struct timeval when;
1474         VALUE_PAIR *vp;
1475
1476         if ((request->master_state == REQUEST_STOP_PROCESSING) ||
1477             (request->parent &&
1478              (request->parent->master_state == REQUEST_STOP_PROCESSING))) {
1479                 DEBUG2("Request %d was cancelled.", request->number);
1480                 request->child_pid = NO_SUCH_CHILD_PID;
1481                 request->child_state = REQUEST_DONE;
1482                 return;
1483         }
1484
1485         if (request->child_state != REQUEST_RUNNING) {
1486                 rad_panic("Internal sanity check failed");
1487         }
1488
1489         if ((request->reply->code == 0) &&
1490             ((vp = pairfind(request->config_items, PW_AUTH_TYPE)) != NULL) &&
1491             (vp->vp_integer == PW_AUTHTYPE_REJECT)) {
1492                 request->reply->code = PW_AUTHENTICATION_REJECT;
1493         }
1494
1495         if (request->root->proxy_requests &&
1496             !request->in_proxy_hash &&
1497             (request->reply->code == 0) &&
1498             (request->packet->dst_port != 0) &&
1499             (request->packet->code != PW_STATUS_SERVER)) {
1500                 int rcode = successfully_proxied_request(request);
1501
1502                 if (rcode == 1) return;
1503
1504                 /*
1505                  *      Failed proxying it (dead home servers, etc.)
1506                  *      Run it through Post-Proxy-Type = Fail, and
1507                  *      respond to the request.
1508                  *
1509                  *      Note that we're in a child thread here, so we
1510                  *      do NOT re-schedule the request.  Instead, we
1511                  *      do what we would have done, which is run the
1512                  *      pre-handler, a NULL request handler, and then
1513                  *      the post handler.
1514                  */
1515                 if ((rcode < 0) && setup_post_proxy_fail(request)) {
1516                         request_pre_handler(request);
1517                 }
1518
1519                 /*
1520                  *      Else we weren't supposed to proxy it,
1521                  *      OR we proxied it internally to a virutal server.
1522                  */
1523         }
1524
1525         /*
1526          *      Fake requests don't get encoded or signed.  The caller
1527          *      also requires the reply VP's, so we don't free them
1528          *      here!
1529          */
1530         if (request->packet->dst_port == 0) {
1531                 /* FIXME: DEBUG going to the next request */
1532                 request->child_pid = NO_SUCH_CHILD_PID;
1533                 request->child_state = REQUEST_DONE;
1534                 return;
1535         }
1536
1537         /*
1538          *      Copy Proxy-State from the request to the reply.
1539          */
1540         vp = paircopy2(request->packet->vps, PW_PROXY_STATE);
1541         if (vp) pairadd(&request->reply->vps, vp);
1542
1543         /*
1544          *      Access-Requests get delayed or cached.
1545          */
1546         switch (request->packet->code) {
1547         case PW_AUTHENTICATION_REQUEST:
1548                 gettimeofday(&request->next_when, NULL);
1549
1550                 if (request->reply->code == 0) {
1551                         /*
1552                          *      Check if the lack of response is intentional.
1553                          */
1554                         vp = pairfind(request->config_items,
1555                                       PW_RESPONSE_PACKET_TYPE);
1556                         if (!vp || (vp->vp_integer != 256)) {
1557                                 DEBUG2("There was no response configured: rejecting request %d",
1558                                        request->number);
1559                                 request->reply->code = PW_AUTHENTICATION_REJECT;
1560                         } else {
1561                                 DEBUG2("Not responding to request %d",
1562                                        request->number);
1563                         }
1564                 }
1565
1566                 /*
1567                  *      Run rejected packets through
1568                  *
1569                  *      Post-Auth-Type = Reject
1570                  */
1571                 if (request->reply->code == PW_AUTHENTICATION_REJECT) {
1572                         pairdelete(&request->config_items, PW_POST_AUTH_TYPE);
1573                         vp = radius_pairmake(request, &request->config_items,
1574                                              "Post-Auth-Type", "Reject",
1575                                              T_OP_SET);
1576                         if (vp) rad_postauth(request);
1577
1578                         /*
1579                          *      If configured, delay Access-Reject packets.
1580                          *
1581                          *      If request->root->reject_delay = 0, we discover
1582                          *      that we have to send the packet now.
1583                          */
1584                         when = request->received;
1585                         when.tv_sec += request->root->reject_delay;
1586
1587                         if (timercmp(&when, &request->next_when, >)) {
1588                                 DEBUG2("Delaying reject of request %d for %d seconds",
1589                                        request->number,
1590                                        request->root->reject_delay);
1591                                 request->next_when = when;
1592                                 request->next_callback = reject_delay;
1593                                 request->child_pid = NO_SUCH_CHILD_PID;
1594                                 request->child_state = REQUEST_REJECT_DELAY;
1595                                 return;
1596                         }
1597                 }
1598
1599                 request->next_when.tv_sec += request->root->cleanup_delay;
1600                 request->next_callback = cleanup_delay;
1601                 child_state = REQUEST_CLEANUP_DELAY;
1602                 break;
1603
1604         case PW_ACCOUNTING_REQUEST:
1605                 request->next_callback = NULL; /* just to be safe */
1606                 child_state = REQUEST_DONE;
1607                 break;
1608
1609                 /*
1610                  *      FIXME: Status-Server should probably not be
1611                  *      handled here...
1612                  */
1613         case PW_STATUS_SERVER:
1614                 request->next_callback = NULL;
1615                 child_state = REQUEST_DONE;
1616                 break;
1617
1618         default:
1619                 rad_panic("Unknown packet type");
1620                 break;
1621         }
1622
1623         /*
1624          *      Suppress "no reply" packets here, unless we're reading
1625          *      from the "detail" file.  In that case, we've got to
1626          *      tell the detail file handler that the request is dead,
1627          *      and it should re-send it.
1628          *      If configured, encode, sign, and send.
1629          */
1630         if ((request->reply->code != 0) ||
1631             (request->listener->type == RAD_LISTEN_DETAIL)) {
1632                 request->listener->send(request->listener, request);
1633         }
1634
1635         /*
1636          *      Clean up.  These are no longer needed.
1637          */
1638         pairfree(&request->config_items);
1639
1640         pairfree(&request->packet->vps);
1641         request->username = NULL;
1642         request->password = NULL;
1643
1644         pairfree(&request->reply->vps);
1645
1646         if (request->proxy) {
1647                 pairfree(&request->proxy->vps);
1648
1649                 if (request->proxy_reply) {
1650                         pairfree(&request->proxy_reply->vps);
1651                 }
1652
1653                 /*
1654                  *      We're not tracking responses from the home
1655                  *      server, we can therefore free this memory in
1656                  *      the child thread.
1657                  */
1658                 if (!request->in_proxy_hash) {
1659                         rad_free(&request->proxy);
1660                         rad_free(&request->proxy_reply);
1661                         request->home_server = NULL;
1662                 }
1663         }
1664
1665         DEBUG2("Finished request %d.", request->number);
1666
1667         request->child_state = child_state;
1668
1669         /*
1670          *      Single threaded mode: update timers now.
1671          */
1672         if (!have_children) wait_a_bit(request);
1673 }
1674
1675
1676 static void received_retransmit(REQUEST *request, const RADCLIENT *client)
1677 {
1678         char buffer[128];
1679
1680         RAD_SNMP_TYPE_INC(request->listener, total_dup_requests);
1681         RAD_SNMP_CLIENT_INC(request->listener, client, dup_requests);
1682
1683         switch (request->child_state) {
1684         case REQUEST_QUEUED:
1685         case REQUEST_RUNNING:
1686         discard:
1687                 radlog(L_ERR, "Discarding duplicate request from "
1688                        "client %s port %d - ID: %d due to unfinished request %d",
1689                        client->shortname,
1690                        request->packet->src_port,request->packet->id,
1691                        request->number);
1692                 break;
1693
1694         case REQUEST_PROXIED:
1695                 /*
1696                  *      We're not supposed to have duplicate
1697                  *      accounting packets.  The other states handle
1698                  *      duplicates fine (discard, or send duplicate
1699                  *      reply).  But we do NOT want to retransmit an
1700                  *      accounting request here, because that would
1701                  *      involve updating the Acct-Delay-Time, and
1702                  *      therefore changing the packet Id, etc.
1703                  *
1704                  *      Instead, we just discard the packet.  We may
1705                  *      eventually respond, or the client will send a
1706                  *      new accounting packet.
1707                  */
1708                 if (request->packet->code == PW_ACCOUNTING_REQUEST) {
1709                         goto discard;
1710                 }
1711
1712                 check_for_zombie_home_server(request);
1713
1714                 /*
1715                  *      If we've just discovered that the home server is
1716                  *      dead, send the packet to another one.
1717                  */
1718                 if ((request->packet->dst_port != 0) &&
1719                     (request->home_server->state == HOME_STATE_IS_DEAD)) {
1720                         home_server *home;
1721
1722                         remove_from_proxy_hash(request);
1723
1724                         home = home_server_ldb(NULL, request->home_pool, request);
1725                         if (!home) {
1726                                 DEBUG2("Failed to find live home server for request %d", request->number);
1727                         no_home_servers:
1728                                 /*
1729                                  *      Do post-request processing,
1730                                  *      and any insertion of necessary
1731                                  *      events.
1732                                  */
1733                                 post_proxy_fail_handler(request);
1734                                 return;
1735                         }
1736
1737                         request->proxy->code = request->packet->code;
1738                         request->proxy->dst_ipaddr = home->ipaddr;
1739                         request->proxy->dst_port = home->port;
1740                         request->home_server = home;
1741
1742                         /*
1743                          *      Free the old packet, to force re-encoding
1744                          */
1745                         free(request->proxy->data);
1746                         request->proxy->data = NULL;
1747                         request->proxy->data_len = 0;
1748
1749                         /*
1750                          *      Try to proxy the request.
1751                          */
1752                         if (!proxy_request(request)) {
1753                                 DEBUG("ERROR: Failed to re-proxy request %d", request->number);
1754                                 goto no_home_servers;
1755                         }
1756
1757                         /*
1758                          *      This code executes in the main server
1759                          *      thread, so there's no need for locking.
1760                          */
1761                         rad_assert(request->next_callback != NULL);
1762                         INSERT_EVENT(request->next_callback, request);
1763                         request->next_callback = NULL;
1764                         return;
1765                 } /* else the home server is still alive */
1766
1767                 DEBUG2("Sending duplicate proxied request to home server %s port %d - ID: %d",
1768                        inet_ntop(request->proxy->dst_ipaddr.af,
1769                                  &request->proxy->dst_ipaddr.ipaddr,
1770                                  buffer, sizeof(buffer)),
1771                        request->proxy->dst_port,
1772                        request->proxy->id);
1773                 request->num_proxied_requests++;
1774                 request->proxy_listener->send(request->proxy_listener,
1775                                               request);
1776                 break;
1777
1778         case REQUEST_REJECT_DELAY:
1779                 DEBUG2("Waiting to send Access-Reject "
1780                        "to client %s port %d - ID: %d",
1781                        client->shortname,
1782                        request->packet->src_port, request->packet->id);
1783                 break;
1784
1785         case REQUEST_CLEANUP_DELAY:
1786         case REQUEST_DONE:
1787                 DEBUG2("Sending duplicate reply "
1788                        "to client %s port %d - ID: %d",
1789                        client->shortname,
1790                        request->packet->src_port, request->packet->id);
1791                 request->listener->send(request->listener, request);
1792                 break;
1793         }
1794 }
1795
1796
1797 static void received_conflicting_request(REQUEST *request,
1798                                          const RADCLIENT *client)
1799 {
1800         radlog(L_ERR, "Received conflicting packet from "
1801                "client %s port %d - ID: %d due to unfinished request %d.  Giving up on old request.",
1802                client->shortname,
1803                request->packet->src_port, request->packet->id,
1804                request->number);
1805
1806         /*
1807          *      Nuke it from the request hash, so we can receive new
1808          *      packets.
1809          */
1810         remove_from_request_hash(request);
1811
1812         switch (request->child_state) {
1813                 /*
1814                  *      It's queued or running.  Tell it to stop, and
1815                  *      wait for it to do so.
1816                  */
1817         case REQUEST_QUEUED:
1818         case REQUEST_RUNNING:
1819                 request->master_state = REQUEST_STOP_PROCESSING;
1820                 request->delay += request->delay >> 1;
1821
1822                 tv_add(&request->when, request->delay);
1823
1824                 INSERT_EVENT(wait_for_child_to_die, request);
1825                 return;
1826
1827                 /*
1828                  *      It's in some other state, and therefore also
1829                  *      in the event queue.  At some point, the
1830                  *      child will notice, and we can then delete it.
1831                  */
1832         default:
1833                 rad_assert(request->ev != NULL);
1834                 break;
1835         }
1836 }
1837
1838
1839 static int can_handle_new_request(RADIUS_PACKET *packet,
1840                                   RADCLIENT *client,
1841                                   struct main_config_t *root)
1842 {
1843         /*
1844          *      Count the total number of requests, to see if
1845          *      there are too many.  If so, return with an
1846          *      error.
1847          */
1848         if (root->max_requests) {
1849                 int request_count = fr_packet_list_num_elements(pl);
1850
1851                 /*
1852                  *      This is a new request.  Let's see if
1853                  *      it makes us go over our configured
1854                  *      bounds.
1855                  */
1856                 if (request_count > root->max_requests) {
1857                         radlog(L_ERR, "Dropping request (%d is too many): "
1858                                "from client %s port %d - ID: %d", request_count,
1859                                client->shortname,
1860                                packet->src_port, packet->id);
1861                         radlog(L_INFO, "WARNING: Please check the configuration file.\n"
1862                                "\tThe value for 'max_requests' is probably set too low.\n");
1863                         return 0;
1864                 } /* else there were a small number of requests */
1865         } /* else there was no configured limit for requests */
1866
1867         /*
1868          *      FIXME: Add per-client checks.  If one client is sending
1869          *      too many packets, start discarding them.
1870          *
1871          *      We increment the counters here, and decrement them
1872          *      when the response is sent... somewhere in this file.
1873          */
1874
1875         /*
1876          *      FUTURE: Add checks for system load.  If the system is
1877          *      busy, start dropping requests...
1878          *
1879          *      We can probably keep some statistics ourselves...  if
1880          *      there are more requests coming in than we can handle,
1881          *      start dropping some.
1882          */
1883
1884         return 1;
1885 }
1886
1887
1888 int received_request(rad_listen_t *listener,
1889                      RADIUS_PACKET *packet, REQUEST **prequest,
1890                      RADCLIENT *client)
1891 {
1892         RADIUS_PACKET **packet_p;
1893         REQUEST *request = NULL;
1894         struct main_config_t *root = &mainconfig;
1895
1896         packet_p = fr_packet_list_find(pl, packet);
1897         if (packet_p) {
1898                 request = fr_packet2myptr(REQUEST, packet, packet_p);
1899                 rad_assert(request->in_request_hash);
1900
1901                 if ((request->packet->data_len == packet->data_len) &&
1902                     (memcmp(request->packet->vector, packet->vector,
1903                             sizeof(packet->vector)) == 0)) {
1904                         received_retransmit(request, client);
1905                         return 0;
1906                 }
1907
1908                 /*
1909                  *      The new request is different from the old one,
1910                  *      but maybe the old is finished.  If so, delete
1911                  *      the old one.
1912                  */
1913                 switch (request->child_state) {
1914                         struct timeval when;
1915
1916                 default:
1917                         gettimeofday(&when, NULL);
1918                         when.tv_sec -= 1;
1919
1920                         /*
1921                          *      If the cached request was received
1922                          *      within the last second, then we
1923                          *      discard the NEW request instead of the
1924                          *      old one.  This will happen ONLY when
1925                          *      the client is severely broken, and is
1926                          *      sending conflicting packets very
1927                          *      quickly.
1928                          */
1929                         if (timercmp(&when, &request->received, <)) {
1930                                 radlog(L_ERR, "Discarding conflicting packet from "
1931                                        "client %s port %d - ID: %d due to recent request %d.",
1932                                        client->shortname,
1933                                        packet->src_port, packet->id,
1934                                        request->number);
1935                                 return 0;
1936                         }
1937
1938                         received_conflicting_request(request, client);
1939                         request = NULL;
1940                         break;
1941
1942                 case REQUEST_REJECT_DELAY:
1943                 case REQUEST_CLEANUP_DELAY:
1944                         request->child_state = REQUEST_DONE;
1945                 case REQUEST_DONE:
1946                         cleanup_delay(request);
1947                         request = NULL;
1948                         break;
1949                 }
1950         }
1951
1952         /*
1953          *      We may want to quench the new request.
1954          */
1955         if ((listener->type != RAD_LISTEN_DETAIL) &&
1956             !can_handle_new_request(packet, client, root)) {
1957                 return 0;
1958         }
1959
1960         /*
1961          *      Create and initialize the new request.
1962          */
1963         request = request_alloc(); /* never fails */
1964
1965         if ((request->reply = rad_alloc(0)) == NULL) {
1966                 radlog(L_ERR, "No memory");
1967                 exit(1);
1968         }
1969
1970         request->listener = listener;
1971         request->client = client;
1972         request->packet = packet;
1973         request->packet->timestamp = request->timestamp;
1974         request->number = request_num_counter++;
1975         request->priority = listener->type;
1976
1977         /*
1978          *      Set virtual server identity
1979          */
1980         if (client->server) {
1981                 request->server = client->server;
1982         } else if (listener->server) {
1983                 request->server = listener->server;
1984         } else {
1985                 request->server = NULL;
1986         }
1987
1988         /*
1989          *      Remember the request in the list.
1990          */
1991         if (!fr_packet_list_insert(pl, &request->packet)) {
1992                 radlog(L_ERR, "Failed to insert request %d in the list of live requests: discarding", request->number);
1993                 request_free(&request);
1994                 return 0;
1995         }
1996
1997         request->in_request_hash = TRUE;
1998         request->root = root;
1999         root->refcount++;
2000
2001         /*
2002          *      The request passes many of our sanity checks.
2003          *      From here on in, if anything goes wrong, we
2004          *      send a reject message, instead of dropping the
2005          *      packet.
2006          */
2007
2008         /*
2009          *      Build the reply template from the request.
2010          */
2011
2012         request->reply->sockfd = request->packet->sockfd;
2013         request->reply->dst_ipaddr = request->packet->src_ipaddr;
2014         request->reply->src_ipaddr = request->packet->dst_ipaddr;
2015         request->reply->dst_port = request->packet->src_port;
2016         request->reply->src_port = request->packet->dst_port;
2017         request->reply->id = request->packet->id;
2018         request->reply->code = 0; /* UNKNOWN code */
2019         memcpy(request->reply->vector, request->packet->vector,
2020                sizeof(request->reply->vector));
2021         request->reply->vps = NULL;
2022         request->reply->data = NULL;
2023         request->reply->data_len = 0;
2024
2025         request->master_state = REQUEST_ACTIVE;
2026         request->child_state = REQUEST_QUEUED;
2027         request->next_callback = NULL;
2028
2029         gettimeofday(&request->received, NULL);
2030         request->timestamp = request->received.tv_sec;
2031         request->when = request->received;
2032
2033         request->delay = USEC;
2034
2035         tv_add(&request->when, request->delay);
2036
2037         INSERT_EVENT(wait_a_bit, request);
2038
2039         *prequest = request;
2040         return 1;
2041 }
2042
2043
2044 REQUEST *received_proxy_response(RADIUS_PACKET *packet)
2045 {
2046         char            buffer[128];
2047         home_server     *home;
2048         REQUEST         *request;
2049
2050         if (!home_server_find(&packet->src_ipaddr, packet->src_port)) {
2051                 radlog(L_ERR, "Ignoring request from unknown home server %s port %d",
2052                        inet_ntop(packet->src_ipaddr.af,
2053                                  &packet->src_ipaddr.ipaddr,
2054                                  buffer, sizeof(buffer)),
2055                                packet->src_port);
2056                 rad_free(&packet);
2057                 return NULL;
2058         }
2059
2060         /*
2061          *      Also removes from the proxy hash if responses == requests
2062          */
2063         request = lookup_in_proxy_hash(packet);
2064
2065         if (!request) {
2066                 radlog(L_PROXY, "No outstanding request was found for proxy reply from home server %s port %d - ID %d",
2067                        inet_ntop(packet->src_ipaddr.af,
2068                                  &packet->src_ipaddr.ipaddr,
2069                                  buffer, sizeof(buffer)),
2070                        packet->src_port, packet->id);
2071                 rad_free(&packet);
2072                 return NULL;
2073         }
2074
2075         home = request->home_server;
2076
2077         gettimeofday(&now, NULL);
2078         home->state = HOME_STATE_ALIVE;
2079
2080         if (request->reply && request->reply->code != 0) {
2081                 DEBUG2("We already replied to this request.  Discarding response from home server.");
2082                 rad_free(&packet);
2083                 return NULL;
2084         }
2085
2086         /*
2087          *      We had previously received a reply, so we don't need
2088          *      to do anything here.
2089          */
2090         if (request->proxy_reply) {
2091                 if (memcmp(request->proxy_reply->vector,
2092                            packet->vector,
2093                            sizeof(request->proxy_reply->vector)) == 0) {
2094                         DEBUG2("Discarding duplicate reply from home server %s port %d  - ID: %d for request %d",
2095                                inet_ntop(packet->src_ipaddr.af,
2096                                          &packet->src_ipaddr.ipaddr,
2097                                          buffer, sizeof(buffer)),
2098                                packet->src_port, packet->id,
2099                                request->number);
2100                 } else {
2101                         /*
2102                          *      ? The home server gave us a new proxy
2103                          *      reply, which doesn't match the old
2104                          *      one.  Delete it.
2105                          */
2106                         DEBUG2("Ignoring conflicting proxy reply");
2107                 }
2108
2109                 /* assert that there's an event queued for request? */
2110                 rad_free(&packet);
2111                 return NULL;
2112         }
2113
2114         switch (request->child_state) {
2115         case REQUEST_QUEUED:
2116         case REQUEST_RUNNING:
2117                 rad_panic("Internal sanity check failed for child state");
2118                 break;
2119
2120         case REQUEST_REJECT_DELAY:
2121         case REQUEST_CLEANUP_DELAY:
2122         case REQUEST_DONE:
2123                 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'",
2124                        inet_ntop(packet->src_ipaddr.af,
2125                                  &packet->src_ipaddr.ipaddr,
2126                                  buffer, sizeof(buffer)),
2127                        packet->src_port, packet->id,
2128                        request->number);
2129                 /* assert that there's an event queued for request? */
2130                 rad_free(&packet);
2131                 return NULL;
2132
2133         case REQUEST_PROXIED:
2134                 break;
2135         }
2136
2137         request->proxy_reply = packet;
2138
2139 #if 0
2140         /*
2141          *      Perform RTT calculations, as per RFC 2988 (for TCP).
2142          *      Note that we do so only if we sent one request, and
2143          *      received one response.  If we sent two requests, we
2144          *      have no idea if the response is for the first, or for
2145          *      the second request/
2146          */
2147         if (request->num_proxied_requests == 1) {
2148                 int rtt;
2149                 home_server *home = request->home_server;
2150
2151                 rtt = now.tv_sec - request->proxy_when.tv_sec;
2152                 rtt *= USEC;
2153                 rtt += now.tv_usec;
2154                 rtt -= request->proxy_when.tv_usec;
2155
2156                 if (!home->has_rtt) {
2157                         home->has_rtt = TRUE;
2158
2159                         home->srtt = rtt;
2160                         home->rttvar = rtt / 2;
2161
2162                 } else {
2163                         home->rttvar -= home->rttvar >> 2;
2164                         home->rttvar += (home->srtt - rtt);
2165                         home->srtt -= home->srtt >> 3;
2166                         home->srtt += rtt >> 3;
2167                 }
2168
2169                 home->rto = home->srtt;
2170                 if (home->rttvar > (USEC / 4)) {
2171                         home->rto += home->rttvar * 4;
2172                 } else {
2173                         home->rto += USEC;
2174                 }
2175         }
2176 #endif
2177
2178         /*
2179          *      There's no incoming request, so it's a proxied packet
2180          *      we originated.
2181          */
2182         if (!request->packet) {
2183                 received_response_to_ping(request);
2184                 return NULL;
2185         }
2186
2187         request->child_state = REQUEST_QUEUED;
2188         request->when = now;
2189         request->delay = USEC;
2190         request->priority = RAD_LISTEN_PROXY;
2191         tv_add(&request->when, request->delay);
2192
2193         /*
2194          *      Wait a bit will take care of max_request_time
2195          */
2196         INSERT_EVENT(wait_a_bit, request);
2197
2198         return request;
2199 }
2200
2201
2202 static void event_detail_timer(void *ctx)
2203 {
2204         rad_listen_t *listener = ctx;
2205         RAD_REQUEST_FUNP fun;
2206         REQUEST *request;
2207
2208         if (listener->recv(listener, &fun, &request)) {
2209                 if (!thread_pool_addrequest(request, fun)) {
2210                         request->child_state = REQUEST_DONE;
2211                 }
2212         }
2213 }
2214
2215 static void handle_signal_self(int flag)
2216 {
2217         if ((flag & (RADIUS_SIGNAL_SELF_EXIT | RADIUS_SIGNAL_SELF_TERM)) != 0) {
2218                 if ((flag & RADIUS_SIGNAL_SELF_EXIT) != 0) {
2219                         fr_event_loop_exit(el, 1);
2220                 } else {
2221                         fr_event_loop_exit(el, 2);
2222                 }
2223
2224                 return;
2225         } /* else exit/term flags weren't set */
2226
2227         /*
2228          *      Tell the even loop to stop processing.
2229          */
2230         if ((flag & RADIUS_SIGNAL_SELF_HUP) != 0) {
2231                 time_t when;
2232                 static time_t last_hup = 0;
2233
2234                 DEBUG("Received HUP signal.");
2235
2236                 when = time(NULL);
2237                 if ((int) (when - last_hup) < 5) {
2238                         radlog(L_INFO, "Ignoring HUP (less than 5s since last one)");
2239                         return;
2240                 }
2241                 last_hup = when;
2242
2243                 fr_event_loop_exit(el, 0x80);
2244         }
2245
2246         if ((flag & RADIUS_SIGNAL_SELF_DETAIL) != 0) {
2247                 rad_listen_t *this;
2248
2249                 for (this = mainconfig.listen;
2250                      this != NULL;
2251                      this = this->next) {
2252                         int delay;
2253                         struct timeval when;
2254
2255                         if (this->type != RAD_LISTEN_DETAIL) continue;
2256
2257                         delay = detail_delay(this);
2258                         if (!delay) continue;
2259
2260                         fr_event_now(el, &now);
2261                         when = now;
2262                         tv_add(&when, delay);
2263
2264                         if (delay > 100000) {
2265                                 DEBUG2("Delaying next detail event for %d.%01u seconds.",
2266                                        delay / USEC, (delay % USEC) / 100000);
2267                         }
2268
2269                         if (!fr_event_insert(el, event_detail_timer, this,
2270                                              &when, NULL)) {
2271                                 radlog(L_ERR, "Failed remembering timer");
2272                                 exit(1);
2273                         }
2274                 }
2275         }
2276
2277         if ((flag & RADIUS_SIGNAL_SELF_NEW_FD) != 0) {
2278                 rad_listen_t *this;
2279
2280                 for (this = mainconfig.listen;
2281                      this != NULL;
2282                      this = this->next) {
2283                         if (this->type != RAD_LISTEN_PROXY) continue;
2284
2285                         if (!fr_event_fd_insert(el, 0, this->fd,
2286                                                 event_socket_handler, this)) {
2287                                 radlog(L_ERR, "Failed remembering handle for proxy socket!");
2288                                 exit(1);
2289                         }
2290                 }
2291         }
2292 }
2293
2294 #ifdef __MINGW32__
2295 void radius_signal_self(int flag)
2296 {
2297         handle_signal_self(flag);
2298 }
2299 #else
2300 /*
2301  *      Inform ourselves that we received a signal.
2302  */
2303 void radius_signal_self(int flag)
2304 {
2305         ssize_t rcode;
2306         uint8_t buffer[16];
2307
2308         /*
2309          *      The read MUST be non-blocking for this to work.
2310          */
2311         rcode = read(self_pipe[0], buffer, sizeof(buffer));
2312         if (rcode > 0) {
2313                 ssize_t i;
2314
2315                 for (i = 0; i < rcode; i++) {
2316                         buffer[0] |= buffer[i];
2317                 }
2318         } else {
2319                 buffer[0] = 0;
2320         }
2321
2322         buffer[0] |= flag;
2323
2324         write(self_pipe[1], buffer, 1);
2325 }
2326
2327
2328 static void event_signal_handler(UNUSED fr_event_list_t *xel,
2329                                  UNUSED int fd, UNUSED void *ctx)
2330 {
2331         ssize_t i, rcode;
2332         uint8_t buffer[32];
2333
2334         rcode = read(self_pipe[0], buffer, sizeof(buffer));
2335         if (rcode <= 0) return;
2336
2337         /*
2338          *      Merge pending signals.
2339          */
2340         for (i = 0; i < rcode; i++) {
2341                 buffer[0] |= buffer[i];
2342         }
2343
2344         handle_signal_self(buffer[0]);
2345 }
2346 #endif
2347
2348
2349 static void event_socket_handler(fr_event_list_t *xel, UNUSED int fd,
2350                                  void *ctx)
2351 {
2352         rad_listen_t *listener = ctx;
2353         RAD_REQUEST_FUNP fun;
2354         REQUEST *request;
2355
2356         rad_assert(xel == el);
2357
2358         xel = xel;
2359
2360         if (listener->fd < 0) rad_panic("Socket was closed on us!");
2361
2362         if (!listener->recv(listener, &fun, &request)) return;
2363
2364         if (!thread_pool_addrequest(request, fun)) {
2365                 request->child_state = REQUEST_DONE;
2366         }
2367 }
2368
2369
2370 /*
2371  *      This function is called periodically to see if any FD's are
2372  *      available for reading.
2373  */
2374 static void event_poll_fds(UNUSED void *ctx)
2375 {
2376         int rcode;
2377         RAD_REQUEST_FUNP fun;
2378         REQUEST *request;
2379         rad_listen_t *this;
2380         struct timeval when;
2381
2382         fr_event_now(el, &now);
2383         when = now;
2384         when.tv_sec += 1;
2385
2386         for (this = mainconfig.listen; this != NULL; this = this->next) {
2387                 if (this->fd >= 0) continue;
2388
2389                 /*
2390                  *      Try to read something.
2391                  *
2392                  *      FIXME: This does poll AND receive.
2393                  */
2394                 rcode = this->recv(this, &fun, &request);
2395                 if (!rcode) continue;
2396
2397                 rad_assert(fun != NULL);
2398                 rad_assert(request != NULL);
2399
2400                 if (!thread_pool_addrequest(request, fun)) {
2401                         request->child_state = REQUEST_DONE;
2402                 }
2403
2404                 /*
2405                  *      We have an FD.  Start watching it.
2406                  */
2407                 if (this->fd >= 0) {
2408                         /*
2409                          *      ... unless it's a detail file.  In
2410                          *      that case, we rely on the signal to
2411                          *      self to know when to continue
2412                          *      processing the detail file.
2413                          */
2414                         if (this->type == RAD_LISTEN_DETAIL) continue;
2415
2416                         /*
2417                          *      FIXME: this should be SNMP handler,
2418                          *      and we should do SOMETHING when the
2419                          *      fd is closed!
2420                          */
2421                         if (!fr_event_fd_insert(el, 0, this->fd,
2422                                                 event_socket_handler, this)) {
2423                                 char buffer[256];
2424
2425                                 this->print(this, buffer, sizeof(buffer));
2426                                 rad_panic("Failed creating handler for snmp");
2427                         }
2428                 }
2429         }
2430
2431         /*
2432          *      Reset the poll.
2433          */
2434         if (!fr_event_insert(el, event_poll_fds, NULL,
2435                              &when, NULL)) {
2436                 radlog(L_ERR, "Failed creating handler");
2437                 exit(1);
2438         }
2439 }
2440
2441
2442 static void event_status(struct timeval *wake)
2443 {
2444 #if !defined(HAVE_PTHREAD_H) && defined(WNOHANG)
2445         int argval;
2446 #endif
2447
2448         if (debug_flag == 0) {
2449                 if (just_started) {
2450                         radlog(L_INFO, "Ready to process requests.");
2451                         just_started = FALSE;
2452                 }
2453                 return;
2454         }
2455
2456         if (!wake) {
2457                 DEBUG("Ready to process requests.");
2458
2459         } else if ((wake->tv_sec != 0) ||
2460                    (wake->tv_usec >= 100000)) {
2461                 DEBUG("Waking up in %d.%01u seconds.",
2462                       (int) wake->tv_sec, (unsigned int) wake->tv_usec / 100000);
2463         }
2464
2465
2466         /*
2467          *      FIXME: Put this somewhere else, where it isn't called
2468          *      all of the time...
2469          */
2470
2471 #if !defined(HAVE_PTHREAD_H) && defined(WNOHANG)
2472         /*
2473          *      If there are no child threads, then there may
2474          *      be child processes.  In that case, wait for
2475          *      their exit status, and throw that exit status
2476          *      away.  This helps get rid of zxombie children.
2477          */
2478         while (waitpid(-1, &argval, WNOHANG) > 0) {
2479                 /* do nothing */
2480         }
2481 #endif
2482
2483 }
2484
2485
2486 /*
2487  *      Externally-visibly functions.
2488  */
2489 int radius_event_init(CONF_SECTION *cs, int spawn_flag)
2490 {
2491         int i;
2492         int has_snmp_listener = FALSE;
2493         rad_listen_t *this, *head = NULL;
2494
2495         if (el) return 0;
2496
2497         time(&start_time);
2498
2499         el = fr_event_list_create(event_status);
2500         if (!el) return 0;
2501
2502         pl = fr_packet_list_create(0);
2503         if (!el) return 0;
2504
2505         request_num_counter = 0;
2506
2507         /*
2508          *      Move all of the thread calls to this file?
2509          *
2510          *      It may be best for the mutexes to be in this file...
2511          */
2512         have_children = spawn_flag;
2513
2514         if (mainconfig.proxy_requests) {
2515                 /*
2516                  *      Create the tree for managing proxied requests and
2517                  *      responses.
2518                  */
2519                 proxy_list = fr_packet_list_create(1);
2520                 if (!proxy_list) return 0;
2521
2522 #ifdef HAVE_PTHREAD_H
2523                 if (pthread_mutex_init(&proxy_mutex, NULL) != 0) {
2524                         radlog(L_ERR, "FATAL: Failed to initialize proxy mutex: %s",
2525                                strerror(errno));
2526                         exit(1);
2527                 }
2528 #endif
2529         }
2530
2531         /*
2532          *      Just before we spawn the child threads, force the log
2533          *      subsystem to re-open the log file for every write.
2534          */
2535         if (spawn_flag) force_log_reopen();
2536
2537 #ifdef HAVE_PTHREAD_H
2538         if (thread_pool_init(cs, spawn_flag) < 0) {
2539                 exit(1);
2540         }
2541 #endif
2542
2543         if (check_config) {
2544                 DEBUG2("%s: #### Skipping IP addresses and Ports ####",
2545                        mainconfig.name);
2546                 return 1;
2547         }
2548
2549 #ifndef __MINGW32__
2550         /*
2551          *      Child threads need a pipe to signal us, as do the
2552          *      signal handlers.
2553          */
2554         if (pipe(self_pipe) < 0) {
2555                 radlog(L_ERR, "radiusd: Error opening internal pipe: %s",
2556                        strerror(errno));
2557                 exit(1);
2558         }
2559         if (fcntl(self_pipe[0], F_SETFL, O_NONBLOCK | FD_CLOEXEC) < 0) {
2560                 radlog(L_ERR, "radiusd: Error setting internal flags: %s",
2561                        strerror(errno));
2562                 exit(1);
2563         }
2564         if (fcntl(self_pipe[1], F_SETFL, O_NONBLOCK | FD_CLOEXEC) < 0) {
2565                 radlog(L_ERR, "radiusd: Error setting internal flags: %s",
2566                        strerror(errno));
2567                 exit(1);
2568         }
2569
2570         if (!fr_event_fd_insert(el, 0, self_pipe[0],
2571                                   event_signal_handler, el)) {
2572                 radlog(L_ERR, "Failed creating handler for signals");
2573                 exit(1);
2574         }
2575 #endif
2576
2577         /*
2578          *      Mark the proxy Fd's as unused.
2579          */
2580         for (i = 0; i < 32; i++) proxy_fds[i] = -1;
2581
2582         DEBUG2("%s: #### Opening IP addresses and Ports ####",
2583                mainconfig.name);
2584
2585         if (listen_init(cs, &head) < 0) {
2586                 _exit(1);
2587         }
2588
2589         /*
2590          *      Add all of the sockets to the event loop.
2591          */
2592         for (this = head;
2593              this != NULL;
2594              this = this->next) {
2595                 char buffer[256];
2596
2597                 this->print(this, buffer, sizeof(buffer));
2598
2599                 switch (this->type) {
2600                 case RAD_LISTEN_DETAIL:
2601                         DEBUG("Listening on %s", buffer);
2602                         has_detail_listener = TRUE;
2603                         break;
2604
2605                 case RAD_LISTEN_SNMP:
2606                         DEBUG("Listening on SNMP %s", buffer);
2607                         has_snmp_listener = TRUE;
2608                         break;
2609
2610                 case RAD_LISTEN_PROXY:
2611                         rad_assert(proxy_fds[this->fd & 0x1f] == -1);
2612                         rad_assert(proxy_listeners[this->fd & 0x1f] == NULL);
2613
2614                         proxy_fds[this->fd & 0x1f] = this->fd;
2615                         proxy_listeners[this->fd & 0x1f] = this;
2616                         if (!fr_packet_list_socket_add(proxy_list,
2617                                                          this->fd)) {
2618                                 rad_assert(0 == 1);
2619                         }
2620                         /* FALL-THROUGH */
2621
2622                 default:
2623                         DEBUG("Listening on %s", buffer);
2624                         break;
2625                 }
2626
2627                 /*
2628                  *      The file descriptor isn't ready.  Poll for
2629                  *      when it will become ready.  This is for SNMP
2630                  *      and detail file fd's.
2631                  */
2632                 if (this->fd < 0) {
2633                         continue;
2634                 }
2635
2636                 /*
2637                  *      The socket is open.  It MUST be a socket,
2638                  *      as we don't pre-open the detail files (yet).
2639                  *
2640                  *      FIXME: if we DO open the detail files automatically,
2641                  *      then much of this code becomes simpler.
2642                  */
2643                 if (!fr_event_fd_insert(el, 0, this->fd,
2644                                           event_socket_handler, this)) {
2645                         this->print(this, buffer, sizeof(buffer));
2646                         radlog(L_ERR, "Failed creating handler for socket %s",
2647                                buffer);
2648                         exit(1);
2649                 }
2650         }
2651
2652         if (has_detail_listener || has_snmp_listener) {
2653                 struct timeval when;
2654
2655                 gettimeofday(&when, NULL);
2656                 when.tv_sec += 1;
2657
2658                 if (!fr_event_insert(el, event_poll_fds, NULL,
2659                                      &when, NULL)) {
2660                         radlog(L_ERR, "Failed creating handler");
2661                         exit(1);
2662                 }
2663         }
2664
2665         mainconfig.listen = head;
2666
2667         return 1;
2668 }
2669
2670
2671 static int request_hash_cb(UNUSED void *ctx, void *data)
2672 {
2673         REQUEST *request = fr_packet2myptr(REQUEST, packet, data);
2674
2675         rad_assert(request->in_proxy_hash == FALSE);
2676
2677         fr_event_delete(el, &request->ev);
2678         remove_from_request_hash(request);
2679         request_free(&request);
2680
2681         return 0;
2682 }
2683
2684
2685 static int proxy_hash_cb(UNUSED void *ctx, void *data)
2686 {
2687         REQUEST *request = fr_packet2myptr(REQUEST, proxy, data);
2688
2689         fr_packet_list_yank(proxy_list, request->proxy);
2690         request->in_proxy_hash = FALSE;
2691
2692         if (!request->in_request_hash) {
2693                 fr_event_delete(el, &request->ev);
2694                 request_free(&request);
2695         }
2696
2697         return 0;
2698 }
2699
2700
2701 void radius_event_free(void)
2702 {
2703         /*
2704          *      FIXME: Stop all threads, or at least check that
2705          *      they're all waiting on the semaphore, and the queues
2706          *      are empty.
2707          */
2708
2709         /*
2710          *      There are requests in the proxy hash that aren't
2711          *      referenced from anywhere else.  Remove them first.
2712          */
2713         if (proxy_list) {
2714                 PTHREAD_MUTEX_LOCK(&proxy_mutex);
2715                 fr_packet_list_walk(proxy_list, NULL, proxy_hash_cb);
2716                 PTHREAD_MUTEX_UNLOCK(&proxy_mutex);
2717                 fr_packet_list_free(proxy_list);
2718                 proxy_list = NULL;
2719         }
2720
2721         fr_packet_list_walk(pl, NULL, request_hash_cb);
2722
2723         fr_packet_list_free(pl);
2724         pl = NULL;
2725
2726         fr_event_list_free(el);
2727 }
2728
2729 int radius_event_process(void)
2730 {
2731         if (!el) return 0;
2732
2733         just_started = TRUE;
2734
2735         return fr_event_loop(el);
2736 }
2737
2738 void radius_handle_request(REQUEST *request, RAD_REQUEST_FUNP fun)
2739 {
2740         if (request_pre_handler(request)) {
2741                 rad_assert(fun != NULL);
2742                 rad_assert(request != NULL);
2743
2744                 if (request->server) DEBUG("server %s {",
2745                                              request->server);
2746                 fun(request);
2747
2748                 if (request->server) DEBUG("} # server %s",
2749                                              request->server);
2750
2751                 request_post_handler(request);
2752         }
2753
2754         DEBUG2("Going to the next request");
2755         return;
2756 }