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         wait_a_bit(request);
 795 }
 796
 797
 798 /* maybe check this against wait_for_proxy_id_to_expire? */
 799 static void no_response_to_proxied_request(void *ctx)
 800 {
 801         REQUEST *request = ctx;
 802         home_server *home;
 803         char buffer[128];
 804
 805         rad_assert(request->magic == REQUEST_MAGIC);
 806         rad_assert(request->child_state == REQUEST_PROXIED);
 807
 808         radlog(L_ERR, "Rejecting request %d due to lack of any response from home server %s port %d",
 809                request->number,
 810                inet_ntop(request->proxy->dst_ipaddr.af,
 811                          &request->proxy->dst_ipaddr.ipaddr,
 812                          buffer, sizeof(buffer)),
 813                request->proxy->dst_port);
 814
 815         check_for_zombie_home_server(request);
 816
 817         home = request->home_server;
 818
 819         post_proxy_fail_handler(request);
 820
 821         /*
 822          *      Don't touch request due to race conditions
 823          */
 824         if (home->state == HOME_STATE_IS_DEAD) {
 825                 rad_assert(home->ev != NULL); /* or it will never wake up */
 826                 return;
 827         }
 828
 829         /*
 830          *      Enable the zombie period when we notice that the home
 831          *      server hasn't responded.  We also back-date the start
 832          *      of the zombie period to when the proxied request was
 833          *      sent.
 834          */
 835         if (home->state == HOME_STATE_ALIVE) {
 836                 DEBUG2("WARNING: Marking home server %s port %d as zombie (it looks like it is dead).",
 837                        inet_ntop(home->ipaddr.af, &home->ipaddr.ipaddr,
 838                                  buffer, sizeof(buffer)),
 839                        home->port);
 840                 home->state = HOME_STATE_ZOMBIE;
 841                 home->zombie_period_start = now;
 842                 home->zombie_period_start.tv_sec -= home->response_window;
 843                 return;
 844         }
 845 }
 846
 847
 848 static void wait_a_bit(void *ctx)
 849 {
 850         struct timeval when;
 851         REQUEST *request = ctx;
 852         fr_event_callback_t callback = NULL;
 853
 854         rad_assert(request->magic == REQUEST_MAGIC);
 855
 856         switch (request->child_state) {
 857         case REQUEST_QUEUED:
 858         case REQUEST_RUNNING:
 859                 when = request->received;
 860                 when.tv_sec += request->root->max_request_time;
 861
 862                 /*
 863                  *      Normally called from the event loop with the
 864                  *      proper event loop time.  Otherwise, called from
 865                  *      post proxy fail handler, which sets "now", and
 866                  *      this call won't re-set it, because we're not
 867                  *      in the event loop.
 868                  */
 869                 fr_event_now(el, &now);
 870
 871                 /*
 872                  *      Request still has more time.  Continue
 873                  *      waiting.
 874                  */
 875                 if (timercmp(&now, &when, <)) {
 876                         if (request->delay < (USEC / 10)) {
 877                                 request->delay = USEC / 10;
 878                         }
 879                         request->delay += request->delay >> 1;
 880                         request->when = now;
 881                         tv_add(&request->when, request->delay);
 882                         callback = wait_a_bit;
 883                         break;
 884                 }
 885
 886                 /*
 887                  *      A child thread MAY still be running on the
 888                  *      request.  Ask the thread to stop working on
 889                  *      the request.
 890                  */
 891                 if (have_children) {
 892                         /* FIXME: kill unresponsive children? */
 893
 894                         /*
 895                          *      Print this error message ONLY if
 896                          *      there's a child currently processing
 897                          *      the request.  As we don't have thread
 898                          *      locks here, there may be race
 899                          *      conditions on this check.  But it's
 900                          *      just an error message, so that's OK.
 901                          */
 902                         if (request->child_pid != NO_SUCH_CHILD_PID) {
 903                                 radlog(L_ERR, "WARNING: Unresponsive child (id %lu) for request %d, in module %s component %s",
 904                                (unsigned long)request->child_pid, request->number,
 905                                        request->module ? request->module : "<server core>",
 906                                        request->component ? request->component : "<server core>");
 907                         }
 908
 909                         request->master_state = REQUEST_STOP_PROCESSING;
 910
 911                         request->delay = USEC / 4;
 912                         tv_add(&request->when, request->delay);
 913                         callback = wait_for_child_to_die;
 914                         break;
 915                 }
 916
 917                 /*
 918                  *      Else there are no child threads.  We probably
 919                  *      should have just marked the request as 'done'
 920                  *      elsewhere, like in the post-proxy-fail
 921                  *      handler.  But doing that would involve
 922                  *      checking for max_request_time in multiple
 923                  *      places, so this may be simplest.
 924                  */
 925                 request->child_state = REQUEST_DONE;
 926                 /* FALL-THROUGH */
 927
 928                 /*
 929                  *      Mark the request as no longer running,
 930                  *      and clean it up.
 931                  */
 932         case REQUEST_DONE:
 933                 request->child_pid = NO_SUCH_CHILD_PID;
 934                 snmp_inc_counters(request);
 935                 cleanup_delay(request);
 936                 return;
 937
 938         case REQUEST_REJECT_DELAY:
 939         case REQUEST_CLEANUP_DELAY:
 940                 request->child_pid = NO_SUCH_CHILD_PID;
 941                 snmp_inc_counters(request);
 942
 943         case REQUEST_PROXIED:
 944                 rad_assert(request->next_callback != NULL);
 945                 rad_assert(request->next_callback != wait_a_bit);
 946
 947                 request->when = request->next_when;
 948                 callback = request->next_callback;
 949                 request->next_callback = NULL;
 950                 break;
 951
 952         default:
 953                 rad_panic("Internal sanity check failure");
 954                 return;
 955         }
 956
 957         INSERT_EVENT(callback, request);
 958 }
 959
 960
 961 static int request_pre_handler(REQUEST *request)
 962 {
 963         int rcode;
 964
 965         rad_assert(request->magic == REQUEST_MAGIC);
 966         rad_assert(request->packet != NULL);
 967         rad_assert(request->packet->dst_port != 0);
 968
 969         request->child_state = REQUEST_RUNNING;
 970
 971         /*
 972          *      Don't decode the packet if it's an internal "fake"
 973          *      request.  Instead, just return so that the caller can
 974          *      process it.
 975          */
 976         if (request->packet->dst_port == 0) {
 977                 request->username = pairfind(request->packet->vps,
 978                                              PW_USER_NAME);
 979                 request->password = pairfind(request->packet->vps,
 980                                              PW_USER_PASSWORD);
 981                 return 1;
 982         }
 983
 984         /*
 985          *      Put the decoded packet into it's proper place.
 986          */
 987         if (request->proxy_reply != NULL) {
 988                 rcode = request->proxy_listener->decode(request->proxy_listener,
 989                                                         request);
 990         } else if (request->packet->vps == NULL) {
 991                 rcode = request->listener->decode(request->listener, request);
 992
 993         } else {
 994                 rcode = 0;
 995         }
 996
 997         if (rcode < 0) {
 998                 radlog(L_ERR, "%s Dropping packet without response.", librad_errstr);
 999                 request->child_state = REQUEST_DONE;
1000                 return 0;
1001         }
1002
1003         if (!request->proxy) {
1004                 request->username = pairfind(request->packet->vps,
1005                                              PW_USER_NAME);
1006
1007         } else {
1008                 int post_proxy_type = 0;
1009                 VALUE_PAIR *vp;
1010
1011                 /*
1012                  *      Delete any reply we had accumulated until now.
1013                  */
1014                 pairfree(&request->reply->vps);
1015
1016                 /*
1017                  *      Run the packet through the post-proxy stage,
1018                  *      BEFORE playing games with the attributes.
1019                  */
1020                 vp = pairfind(request->config_items, PW_POST_PROXY_TYPE);
1021                 if (vp) {
1022                         DEBUG2("  Found Post-Proxy-Type %s", vp->vp_strvalue);
1023                         post_proxy_type = vp->vp_integer;
1024                 }
1025
1026                 rad_assert(request->home_pool != NULL);
1027
1028                 if (request->home_pool->virtual_server) {
1029                         const char *old_server = request->server;
1030
1031                         request->server = request->home_pool->virtual_server;
1032                         DEBUG2(" server %s {", request->server);
1033                         rcode = module_post_proxy(post_proxy_type, request);
1034                         DEBUG2(" }");
1035                         request->server = old_server;
1036                 } else {
1037                         rcode = module_post_proxy(post_proxy_type, request);
1038                 }
1039
1040                 /*
1041                  *      There may NOT be a proxy reply, as we may be
1042                  *      running Post-Proxy-Type = Fail.
1043                  */
1044                 if (request->proxy_reply) {
1045                         /*
1046                          *      Delete the Proxy-State Attributes from
1047                          *      the reply.  These include Proxy-State
1048                          *      attributes from us and remote server.
1049                          */
1050                         pairdelete(&request->proxy_reply->vps, PW_PROXY_STATE);
1051
1052                         /*
1053                          *      Add the attributes left in the proxy
1054                          *      reply to the reply list.
1055                          */
1056                         pairadd(&request->reply->vps, request->proxy_reply->vps);
1057                         request->proxy_reply->vps = NULL;
1058
1059                         /*
1060                          *      Free proxy request pairs.
1061                          */
1062                         pairfree(&request->proxy->vps);
1063                 }
1064
1065                 switch (rcode) {
1066                 default:  /* Don't do anything */
1067                         break;
1068                 case RLM_MODULE_FAIL:
1069                         /* FIXME: debug print stuff */
1070                         request->child_state = REQUEST_DONE;
1071                         return 0;
1072
1073                 case RLM_MODULE_HANDLED:
1074                         /* FIXME: debug print stuff */
1075                         request->child_state = REQUEST_DONE;
1076                         return 0;
1077                 }
1078         }
1079
1080         return 1;
1081 }
1082
1083
1084 /*
1085  *      Do state handling when we proxy a request.
1086  */
1087 static int proxy_request(REQUEST *request)
1088 {
1089         struct timeval when;
1090         char buffer[128];
1091
1092         if (!insert_into_proxy_hash(request)) {
1093                 DEBUG("ERROR: Failed inserting request into proxy hash.");
1094                 return 0;
1095         }
1096
1097         request->proxy_listener->encode(request->proxy_listener, request);
1098
1099         when = request->received;
1100         when.tv_sec += request->root->max_request_time;
1101
1102         gettimeofday(&request->proxy_when, NULL);
1103
1104         request->next_when = request->proxy_when;
1105         request->next_when.tv_sec += request->home_server->response_window;
1106
1107         rad_assert(request->home_server->response_window > 0);
1108
1109         if (timercmp(&when, &request->next_when, <)) {
1110                 request->next_when = when;
1111         }
1112         request->next_callback = no_response_to_proxied_request;
1113
1114         DEBUG2("Proxying request %d to home server %s port %d",
1115                request->number,
1116                inet_ntop(request->proxy->dst_ipaddr.af,
1117                          &request->proxy->dst_ipaddr.ipaddr,
1118                          buffer, sizeof(buffer)),
1119                request->proxy->dst_port);
1120
1121         /*
1122          *      Note that we set proxied BEFORE sending the packet.
1123          *
1124          *      Once we send it, the request is tainted, as
1125          *      another thread may have picked it up.  Don't
1126          *      touch it!
1127          */
1128         request->num_proxied_requests = 1;
1129         request->num_proxied_responses = 0;
1130         request->child_pid = NO_SUCH_CHILD_PID;
1131         request->child_state = REQUEST_PROXIED;
1132         request->proxy_listener->send(request->proxy_listener,
1133                                       request);
1134         return 1;
1135 }
1136
1137 /*
1138  *      Return 1 if we did proxy it, or the proxy attempt failed
1139  *      completely.  Either way, the caller doesn't touch the request
1140  *      any more if we return 1.
1141  */
1142 static int successfully_proxied_request(REQUEST *request)
1143 {
1144         int rcode;
1145         int pre_proxy_type = 0;
1146         VALUE_PAIR *realmpair;
1147         VALUE_PAIR *strippedname;
1148         VALUE_PAIR *vp;
1149         char *realmname;
1150         home_server *home;
1151         REALM *realm = NULL;
1152         home_pool_t *pool;
1153
1154         /*
1155          *      If it was already proxied, do nothing.
1156          *
1157          *      FIXME: This should really be a serious error.
1158          */
1159         if (request->in_proxy_hash) {
1160                 return 0;
1161         }
1162
1163         realmpair = pairfind(request->config_items, PW_PROXY_TO_REALM);
1164         if (!realmpair || (realmpair->length == 0)) {
1165                 return 0;
1166         }
1167
1168         realmname = (char *) realmpair->vp_strvalue;
1169
1170         realm = realm_find(realmname);
1171         if (!realm) {
1172                 DEBUG2("ERROR: Cannot proxy to unknown realm %s", realmname);
1173                 return 0;
1174         }
1175
1176         /*
1177          *      Figure out which pool to use.
1178          */
1179         if (request->packet->code == PW_AUTHENTICATION_REQUEST) {
1180                 pool = realm->auth_pool;
1181
1182         } else if (request->packet->code == PW_ACCOUNTING_REQUEST) {
1183                 pool = realm->acct_pool;
1184
1185         } else {
1186                 rad_panic("Internal sanity check failed");
1187         }
1188
1189         if (!pool) {
1190                 DEBUG2(" WARNING: Cancelling proxy to Realm %s, as the realm is local.",
1191                        realmname);
1192                 return 0;
1193         }
1194
1195         home = home_server_ldb(realmname, pool, request);
1196         if (!home) {
1197                 DEBUG2("ERROR: Failed to find live home server for realm %s",
1198                        realmname);
1199                 return -1;
1200         }
1201         request->home_pool = pool;
1202
1203         /*
1204          *      Remember that we sent the request to a Realm.
1205          */
1206         pairadd(&request->packet->vps,
1207                 pairmake("Realm", realmname, T_OP_EQ));
1208
1209         /*
1210          *      We read the packet from a detail file, AND it came from
1211          *      the server we're about to send it to.  Don't do that.
1212          */
1213         if ((request->packet->code == PW_ACCOUNTING_REQUEST) &&
1214             (request->listener->type == RAD_LISTEN_DETAIL) &&
1215             (home->ipaddr.af == AF_INET) &&
1216             (request->packet->src_ipaddr.af == AF_INET) &&
1217             (home->ipaddr.ipaddr.ip4addr.s_addr == request->packet->src_ipaddr.ipaddr.ip4addr.s_addr)) {
1218                 DEBUG2("    rlm_realm: Packet came from realm %s, proxy cancelled", realmname);
1219                 return 0;
1220         }
1221
1222         /*
1223          *      Allocate the proxy packet, only if it wasn't already
1224          *      allocated by a module.  This check is mainly to support
1225          *      the proxying of EAP-TTLS and EAP-PEAP tunneled requests.
1226          *
1227          *      In those cases, the EAP module creates a "fake"
1228          *      request, and recursively passes it through the
1229          *      authentication stage of the server.  The module then
1230          *      checks if the request was supposed to be proxied, and
1231          *      if so, creates a proxy packet from the TUNNELED request,
1232          *      and not from the EAP request outside of the tunnel.
1233          *
1234          *      The proxy then works like normal, except that the response
1235          *      packet is "eaten" by the EAP module, and encapsulated into
1236          *      an EAP packet.
1237          */
1238         if (!request->proxy) {
1239                 if ((request->proxy = rad_alloc(TRUE)) == NULL) {
1240                         radlog(L_ERR|L_CONS, "no memory");
1241                         exit(1);
1242                 }
1243
1244                 /*
1245                  *      Copy the request, then look up name and
1246                  *      plain-text password in the copy.
1247                  *
1248                  *      Note that the User-Name attribute is the
1249                  *      *original* as sent over by the client.  The
1250                  *      Stripped-User-Name attribute is the one hacked
1251                  *      through the 'hints' file.
1252                  */
1253                 request->proxy->vps =  paircopy(request->packet->vps);
1254         }
1255
1256         /*
1257          *      Strip the name, if told to.
1258          *
1259          *      Doing it here catches the case of proxied tunneled
1260          *      requests.
1261          */
1262         if (realm->striprealm == TRUE &&
1263            (strippedname = pairfind(request->proxy->vps, PW_STRIPPED_USER_NAME)) != NULL) {
1264                 /*
1265                  *      If there's a Stripped-User-Name attribute in
1266                  *      the request, then use THAT as the User-Name
1267                  *      for the proxied request, instead of the
1268                  *      original name.
1269                  *
1270                  *      This is done by making a copy of the
1271                  *      Stripped-User-Name attribute, turning it into
1272                  *      a User-Name attribute, deleting the
1273                  *      Stripped-User-Name and User-Name attributes
1274                  *      from the vps list, and making the new
1275                  *      User-Name the head of the vps list.
1276                  */
1277                 vp = pairfind(request->proxy->vps, PW_USER_NAME);
1278                 if (!vp) {
1279                         vp = radius_paircreate(request, NULL,
1280                                                PW_USER_NAME, PW_TYPE_STRING);
1281                         rad_assert(vp != NULL); /* handled by above function */
1282                         /* Insert at the START of the list */
1283                         vp->next = request->proxy->vps;
1284                         request->proxy->vps = vp;
1285                 }
1286                 memcpy(vp->vp_strvalue, strippedname->vp_strvalue,
1287                        sizeof(vp->vp_strvalue));
1288                 vp->length = strippedname->length;
1289
1290                 /*
1291                  *      Do NOT delete Stripped-User-Name.
1292                  */
1293         }
1294
1295         /*
1296          *      If there is no PW_CHAP_CHALLENGE attribute but
1297          *      there is a PW_CHAP_PASSWORD we need to add it
1298          *      since we can't use the request authenticator
1299          *      anymore - we changed it.
1300          */
1301         if (pairfind(request->proxy->vps, PW_CHAP_PASSWORD) &&
1302             pairfind(request->proxy->vps, PW_CHAP_CHALLENGE) == NULL) {
1303                 vp = radius_paircreate(request, &request->proxy->vps,
1304                                        PW_CHAP_CHALLENGE, PW_TYPE_OCTETS);
1305                 vp->length = AUTH_VECTOR_LEN;
1306                 memcpy(vp->vp_strvalue, request->packet->vector, AUTH_VECTOR_LEN);
1307         }
1308
1309         /*
1310          *      The RFC's say we have to do this, but FreeRADIUS
1311          *      doesn't need it.
1312          */
1313         vp = radius_paircreate(request, &request->proxy->vps,
1314                                PW_PROXY_STATE, PW_TYPE_OCTETS);
1315         snprintf(vp->vp_strvalue, sizeof(vp->vp_strvalue), "%d",
1316                  request->packet->id);
1317         vp->length = strlen(vp->vp_strvalue);
1318
1319         /*
1320          *      Should be done BEFORE inserting into proxy hash, as
1321          *      pre-proxy may use this information, or change it.
1322          */
1323         request->proxy->code = request->packet->code;
1324         request->proxy->dst_ipaddr = home->ipaddr;
1325         request->proxy->dst_port = home->port;
1326         request->home_server = home;
1327
1328         /*
1329          *      Call the pre-proxy routines.
1330          */
1331         vp = pairfind(request->config_items, PW_PRE_PROXY_TYPE);
1332         if (vp) {
1333                 DEBUG2("  Found Pre-Proxy-Type %s", vp->vp_strvalue);
1334                 pre_proxy_type = vp->vp_integer;
1335         }
1336
1337         rad_assert(request->home_pool != NULL);
1338
1339         if (request->home_pool->virtual_server) {
1340                 const char *old_server = request->server;
1341
1342                 request->server = request->home_pool->virtual_server;
1343                 DEBUG2(" server %s {", request->server);
1344                 rcode = module_pre_proxy(pre_proxy_type, request);
1345                 DEBUG2(" }");
1346                         request->server = old_server;
1347         } else {
1348                 rcode = module_pre_proxy(pre_proxy_type, request);
1349         }
1350         switch (rcode) {
1351         case RLM_MODULE_FAIL:
1352         case RLM_MODULE_INVALID:
1353         case RLM_MODULE_NOTFOUND:
1354         case RLM_MODULE_USERLOCK:
1355         default:
1356                 /* FIXME: debug print failed stuff */
1357                 return -1;
1358
1359         case RLM_MODULE_REJECT:
1360         case RLM_MODULE_HANDLED:
1361                 return 0;
1362
1363         /*
1364          *      Only proxy the packet if the pre-proxy code succeeded.
1365          */
1366         case RLM_MODULE_NOOP:
1367         case RLM_MODULE_OK:
1368         case RLM_MODULE_UPDATED:
1369                 break;
1370         }
1371
1372         /*
1373          *      If it's a fake request, don't send the proxy
1374          *      packet.  The outer tunnel session will take
1375          *      care of doing that.
1376          */
1377         if (request->packet->dst_port == 0) {
1378                 request->home_server = NULL;
1379                 return 1;
1380         }
1381
1382         if (!proxy_request(request)) {
1383                 DEBUG("ERROR: Failed to proxy request %d", request->number);
1384                 return -1;
1385         }
1386
1387         return 1;
1388 }
1389
1390
1391 static void request_post_handler(REQUEST *request)
1392 {
1393         int child_state = -1;
1394         struct timeval when;
1395         VALUE_PAIR *vp;
1396
1397         if ((request->master_state == REQUEST_STOP_PROCESSING) ||
1398             (request->parent &&
1399              (request->parent->master_state == REQUEST_STOP_PROCESSING))) {
1400                 DEBUG2("Request %d was cancelled.", request->number);
1401                 request->child_pid = NO_SUCH_CHILD_PID;
1402                 request->child_state = REQUEST_DONE;
1403                 return;
1404         }
1405
1406         if (request->child_state != REQUEST_RUNNING) {
1407                 rad_panic("Internal sanity check failed");
1408         }
1409
1410         if ((request->reply->code == 0) &&
1411             ((vp = pairfind(request->config_items, PW_AUTH_TYPE)) != NULL) &&
1412             (vp->vp_integer == PW_AUTHTYPE_REJECT)) {
1413                 request->reply->code = PW_AUTHENTICATION_REJECT;
1414         }
1415
1416         if (request->root->proxy_requests &&
1417             !request->in_proxy_hash &&
1418             (request->reply->code == 0) &&
1419             (request->packet->dst_port != 0) &&
1420             (request->packet->code != PW_STATUS_SERVER)) {
1421                 int rcode = successfully_proxied_request(request);
1422
1423                 if (rcode == 1) return;
1424
1425                 /*
1426                  *      Failed proxying it (dead home servers, etc.)
1427                  *      Run it through Post-Proxy-Type = Fail, and
1428                  *      respond to the request.
1429                  *
1430                  *      Note that we're in a child thread here, so we
1431                  *      do NOT re-schedule the request.  Instead, we
1432                  *      do what we would have done, which is run the
1433                  *      pre-handler, a NULL request handler, and then
1434                  *      the post handler.
1435                  */
1436                 if ((rcode < 0) && setup_post_proxy_fail(request)) {
1437                         request_pre_handler(request);
1438                 }
1439
1440                 /*
1441                  *      Else we weren't supposed to proxy it.
1442                  */
1443         }
1444
1445         /*
1446          *      Fake requests don't get encoded or signed.  The caller
1447          *      also requires the reply VP's, so we don't free them
1448          *      here!
1449          */
1450         if (request->packet->dst_port == 0) {
1451                 /* FIXME: DEBUG going to the next request */
1452                 request->child_pid = NO_SUCH_CHILD_PID;
1453                 request->child_state = REQUEST_DONE;
1454                 return;
1455         }
1456
1457         /*
1458          *      Copy Proxy-State from the request to the reply.
1459          */
1460         vp = paircopy2(request->packet->vps, PW_PROXY_STATE);
1461         if (vp) pairadd(&request->reply->vps, vp);
1462
1463         /*
1464          *      Access-Requests get delayed or cached.
1465          */
1466         switch (request->packet->code) {
1467         case PW_AUTHENTICATION_REQUEST:
1468                 gettimeofday(&request->next_when, NULL);
1469
1470                 if (request->reply->code == 0) {
1471                         /*
1472                          *      Check if the lack of response is intentional.
1473                          */
1474                         vp = pairfind(request->config_items,
1475                                       PW_RESPONSE_PACKET_TYPE);
1476                         if (!vp || (vp->vp_integer != 256)) {
1477                                 DEBUG2("There was no response configured: rejecting request %d",
1478                                        request->number);
1479                                 request->reply->code = PW_AUTHENTICATION_REJECT;
1480                         } else {
1481                                 DEBUG2("Not responding to request %d",
1482                                        request->number);
1483                         }
1484                 }
1485
1486                 /*
1487                  *      Run rejected packets through
1488                  *
1489                  *      Post-Auth-Type = Reject
1490                  */
1491                 if (request->reply->code == PW_AUTHENTICATION_REJECT) {
1492                         pairdelete(&request->config_items, PW_POST_AUTH_TYPE);
1493                         vp = radius_pairmake(request, &request->config_items,
1494                                              "Post-Auth-Type", "Reject",
1495                                              T_OP_SET);
1496                         if (vp) rad_postauth(request);
1497
1498                         /*
1499                          *      If configured, delay Access-Reject packets.
1500                          *
1501                          *      If request->root->reject_delay = 0, we discover
1502                          *      that we have to send the packet now.
1503                          */
1504                         when = request->received;
1505                         when.tv_sec += request->root->reject_delay;
1506
1507                         if (timercmp(&when, &request->next_when, >)) {
1508                                 DEBUG2("Delaying reject of request %d for %d seconds",
1509                                        request->number,
1510                                        request->root->reject_delay);
1511                                 request->next_when = when;
1512                                 request->next_callback = reject_delay;
1513                                 request->child_pid = NO_SUCH_CHILD_PID;
1514                                 request->child_state = REQUEST_REJECT_DELAY;
1515                                 return;
1516                         }
1517                 }
1518
1519                 request->next_when.tv_sec += request->root->cleanup_delay;
1520                 request->next_callback = cleanup_delay;
1521                 child_state = REQUEST_CLEANUP_DELAY;
1522                 break;
1523
1524         case PW_ACCOUNTING_REQUEST:
1525                 request->next_callback = NULL; /* just to be safe */
1526                 child_state = REQUEST_DONE;
1527                 break;
1528
1529                 /*
1530                  *      FIXME: Status-Server should probably not be
1531                  *      handled here...
1532                  */
1533         case PW_STATUS_SERVER:
1534                 request->next_callback = NULL;
1535                 child_state = REQUEST_DONE;
1536                 break;
1537
1538         default:
1539                 rad_panic("Unknown packet type");
1540                 break;
1541         }
1542
1543         /*
1544          *      Suppress "no reply" packets here, unless we're reading
1545          *      from the "detail" file.  In that case, we've got to
1546          *      tell the detail file handler that the request is dead,
1547          *      and it should re-send it.
1548          *      If configured, encode, sign, and send.
1549          */
1550         if ((request->reply->code != 0) ||
1551             (request->listener->type == RAD_LISTEN_DETAIL)) {
1552                 request->listener->send(request->listener, request);
1553         }
1554
1555         /*
1556          *      Clean up.  These are no longer needed.
1557          */
1558         pairfree(&request->config_items);
1559
1560         pairfree(&request->packet->vps);
1561         request->username = NULL;
1562         request->password = NULL;
1563
1564         pairfree(&request->reply->vps);
1565
1566         if (request->proxy) {
1567                 pairfree(&request->proxy->vps);
1568
1569                 if (request->proxy_reply) {
1570                         pairfree(&request->proxy_reply->vps);
1571                 }
1572
1573                 /*
1574                  *      We're not tracking responses from the home
1575                  *      server, we can therefore free this memory in
1576                  *      the child thread.
1577                  */
1578                 if (!request->in_proxy_hash) {
1579                         rad_free(&request->proxy);
1580                         rad_free(&request->proxy_reply);
1581                         request->home_server = NULL;
1582                 }
1583         }
1584
1585         DEBUG2("Finished request %d.", request->number);
1586
1587         request->child_state = child_state;
1588 }
1589
1590
1591 static void received_retransmit(REQUEST *request, const RADCLIENT *client)
1592 {
1593         char buffer[128];
1594
1595         RAD_SNMP_TYPE_INC(request->listener, total_dup_requests);
1596         RAD_SNMP_CLIENT_INC(request->listener, client, dup_requests);
1597
1598         switch (request->child_state) {
1599         case REQUEST_QUEUED:
1600         case REQUEST_RUNNING:
1601         discard:
1602                 radlog(L_ERR, "Discarding duplicate request from "
1603                        "client %s port %d - ID: %d due to unfinished request %d",
1604                        client->shortname,
1605                        request->packet->src_port,request->packet->id,
1606                        request->number);
1607                 break;
1608
1609         case REQUEST_PROXIED:
1610                 /*
1611                  *      We're not supposed to have duplicate
1612                  *      accounting packets.  The other states handle
1613                  *      duplicates fine (discard, or send duplicate
1614                  *      reply).  But we do NOT want to retransmit an
1615                  *      accounting request here, because that would
1616                  *      involve updating the Acct-Delay-Time, and
1617                  *      therefore changing the packet Id, etc.
1618                  *
1619                  *      Instead, we just discard the packet.  We may
1620                  *      eventually respond, or the client will send a
1621                  *      new accounting packet.
1622                  */
1623                 if (request->packet->code == PW_ACCOUNTING_REQUEST) {
1624                         goto discard;
1625                 }
1626
1627                 check_for_zombie_home_server(request);
1628
1629                 /*
1630                  *      If we've just discovered that the home server is
1631                  *      dead, send the packet to another one.
1632                  */
1633                 if ((request->packet->dst_port != 0) &&
1634                     (request->home_server->state == HOME_STATE_IS_DEAD)) {
1635                         home_server *home;
1636
1637                         remove_from_proxy_hash(request);
1638
1639                         home = home_server_ldb(NULL, request->home_pool, request);
1640                         if (!home) {
1641                                 DEBUG2("Failed to find live home server for request %d", request->number);
1642                         no_home_servers:
1643                                 /*
1644                                  *      Do post-request processing,
1645                                  *      and any insertion of necessary
1646                                  *      events.
1647                                  */
1648                                 post_proxy_fail_handler(request);
1649                                 return;
1650                         }
1651
1652                         request->proxy->code = request->packet->code;
1653                         request->proxy->dst_ipaddr = home->ipaddr;
1654                         request->proxy->dst_port = home->port;
1655                         request->home_server = home;
1656
1657                         /*
1658                          *      Free the old packet, to force re-encoding
1659                          */
1660                         free(request->proxy->data);
1661                         request->proxy->data = NULL;
1662                         request->proxy->data_len = 0;
1663
1664                         /*
1665                          *      Try to proxy the request.
1666                          */
1667                         if (!proxy_request(request)) {
1668                                 DEBUG("ERROR: Failed to re-proxy request %d", request->number);
1669                                 goto no_home_servers;
1670                         }
1671
1672                         /*
1673                          *      This code executes in the main server
1674                          *      thread, so there's no need for locking.
1675                          */
1676                         rad_assert(request->next_callback != NULL);
1677                         INSERT_EVENT(request->next_callback, request);
1678                         request->next_callback = NULL;
1679                         return;
1680                 } /* else the home server is still alive */
1681
1682                 DEBUG2("Sending duplicate proxied request to home server %s port %d - ID: %d",
1683                        inet_ntop(request->proxy->dst_ipaddr.af,
1684                                  &request->proxy->dst_ipaddr.ipaddr,
1685                                  buffer, sizeof(buffer)),
1686                        request->proxy->dst_port,
1687                        request->proxy->id);
1688                 request->num_proxied_requests++;
1689                 request->proxy_listener->send(request->proxy_listener,
1690                                               request);
1691                 break;
1692
1693         case REQUEST_REJECT_DELAY:
1694                 DEBUG2("Waiting to send Access-Reject "
1695                        "to client %s port %d - ID: %d",
1696                        client->shortname,
1697                        request->packet->src_port, request->packet->id);
1698                 break;
1699
1700         case REQUEST_CLEANUP_DELAY:
1701         case REQUEST_DONE:
1702                 DEBUG2("Sending duplicate reply "
1703                        "to client %s port %d - ID: %d",
1704                        client->shortname,
1705                        request->packet->src_port, request->packet->id);
1706                 request->listener->send(request->listener, request);
1707                 break;
1708         }
1709 }
1710
1711
1712 static void received_conflicting_request(REQUEST *request,
1713                                          const RADCLIENT *client)
1714 {
1715         radlog(L_ERR, "Received conflicting packet from "
1716                "client %s port %d - ID: %d due to unfinished request %d.  Giving up on old request.",
1717                client->shortname,
1718                request->packet->src_port, request->packet->id,
1719                request->number);
1720
1721         /*
1722          *      Nuke it from the request hash, so we can receive new
1723          *      packets.
1724          */
1725         remove_from_request_hash(request);
1726
1727         switch (request->child_state) {
1728                 /*
1729                  *      It's queued or running.  Tell it to stop, and
1730                  *      wait for it to do so.
1731                  */
1732         case REQUEST_QUEUED:
1733         case REQUEST_RUNNING:
1734                 request->master_state = REQUEST_STOP_PROCESSING;
1735                 request->delay += request->delay >> 1;
1736
1737                 tv_add(&request->when, request->delay);
1738
1739                 INSERT_EVENT(wait_for_child_to_die, request);
1740                 return;
1741
1742                 /*
1743                  *      It's in some other state, and therefore also
1744                  *      in the event queue.  At some point, the
1745                  *      child will notice, and we can then delete it.
1746                  */
1747         default:
1748                 rad_assert(request->ev != NULL);
1749                 break;
1750         }
1751 }
1752
1753
1754 static int can_handle_new_request(RADIUS_PACKET *packet,
1755                                   RADCLIENT *client,
1756                                   struct main_config_t *root)
1757 {
1758         /*
1759          *      Count the total number of requests, to see if
1760          *      there are too many.  If so, return with an
1761          *      error.
1762          */
1763         if (root->max_requests) {
1764                 int request_count = fr_packet_list_num_elements(pl);
1765
1766                 /*
1767                  *      This is a new request.  Let's see if
1768                  *      it makes us go over our configured
1769                  *      bounds.
1770                  */
1771                 if (request_count > root->max_requests) {
1772                         radlog(L_ERR, "Dropping request (%d is too many): "
1773                                "from client %s port %d - ID: %d", request_count,
1774                                client->shortname,
1775                                packet->src_port, packet->id);
1776                         radlog(L_INFO, "WARNING: Please check the configuration file.\n"
1777                                "\tThe value for 'max_requests' is probably set too low.\n");
1778                         return 0;
1779                 } /* else there were a small number of requests */
1780         } /* else there was no configured limit for requests */
1781
1782         /*
1783          *      FIXME: Add per-client checks.  If one client is sending
1784          *      too many packets, start discarding them.
1785          *
1786          *      We increment the counters here, and decrement them
1787          *      when the response is sent... somewhere in this file.
1788          */
1789
1790         /*
1791          *      FUTURE: Add checks for system load.  If the system is
1792          *      busy, start dropping requests...
1793          *
1794          *      We can probably keep some statistics ourselves...  if
1795          *      there are more requests coming in than we can handle,
1796          *      start dropping some.
1797          */
1798
1799         return 1;
1800 }
1801
1802
1803 int received_request(rad_listen_t *listener,
1804                      RADIUS_PACKET *packet, REQUEST **prequest,
1805                      RADCLIENT *client)
1806 {
1807         RADIUS_PACKET **packet_p;
1808         REQUEST *request = NULL;
1809         struct main_config_t *root = &mainconfig;
1810
1811         packet_p = fr_packet_list_find(pl, packet);
1812         if (packet_p) {
1813                 request = fr_packet2myptr(REQUEST, packet, packet_p);
1814                 rad_assert(request->in_request_hash);
1815
1816                 if ((request->packet->data_len == packet->data_len) &&
1817                     (memcmp(request->packet->vector, packet->vector,
1818                             sizeof(packet->vector)) == 0)) {
1819                         received_retransmit(request, client);
1820                         return 0;
1821                 }
1822
1823                 /*
1824                  *      The new request is different from the old one,
1825                  *      but maybe the old is finished.  If so, delete
1826                  *      the old one.
1827                  */
1828                 switch (request->child_state) {
1829                         struct timeval when;
1830
1831                 default:
1832                         gettimeofday(&when, NULL);
1833                         when.tv_sec -= 1;
1834
1835                         /*
1836                          *      If the cached request was received
1837                          *      within the last second, then we
1838                          *      discard the NEW request instead of the
1839                          *      old one.  This will happen ONLY when
1840                          *      the client is severely broken, and is
1841                          *      sending conflicting packets very
1842                          *      quickly.
1843                          */
1844                         if (timercmp(&when, &request->received, <)) {
1845                                 radlog(L_ERR, "Discarding conflicting packet from "
1846                                        "client %s port %d - ID: %d due to recent request %d.",
1847                                        client->shortname,
1848                                        packet->src_port, packet->id,
1849                                        request->number);
1850                                 return 0;
1851                         }
1852
1853                         received_conflicting_request(request, client);
1854                         request = NULL;
1855                         break;
1856
1857                 case REQUEST_REJECT_DELAY:
1858                 case REQUEST_CLEANUP_DELAY:
1859                         request->child_state = REQUEST_DONE;
1860                 case REQUEST_DONE:
1861                         cleanup_delay(request);
1862                         request = NULL;
1863                         break;
1864                 }
1865         }
1866
1867         /*
1868          *      We may want to quench the new request.
1869          */
1870         if ((listener->type != RAD_LISTEN_DETAIL) &&
1871             !can_handle_new_request(packet, client, root)) {
1872                 return 0;
1873         }
1874
1875         /*
1876          *      Create and initialize the new request.
1877          */
1878         request = request_alloc(); /* never fails */
1879
1880         if ((request->reply = rad_alloc(0)) == NULL) {
1881                 radlog(L_ERR, "No memory");
1882                 exit(1);
1883         }
1884
1885         request->listener = listener;
1886         request->client = client;
1887         request->packet = packet;
1888         request->packet->timestamp = request->timestamp;
1889         request->number = request_num_counter++;
1890         request->priority = listener->type;
1891
1892         /*
1893          *      Set virtual server identity
1894          */
1895         if (client->server) {
1896                 request->server = client->server;
1897         } else if (listener->server) {
1898                 request->server = listener->server;
1899         } else {
1900                 request->server = NULL;
1901         }
1902
1903         /*
1904          *      Remember the request in the list.
1905          */
1906         if (!fr_packet_list_insert(pl, &request->packet)) {
1907                 radlog(L_ERR, "Failed to insert request %d in the list of live requests: discarding", request->number);
1908                 request_free(&request);
1909                 return 0;
1910         }
1911
1912         request->in_request_hash = TRUE;
1913         request->root = root;
1914         root->refcount++;
1915
1916         /*
1917          *      The request passes many of our sanity checks.
1918          *      From here on in, if anything goes wrong, we
1919          *      send a reject message, instead of dropping the
1920          *      packet.
1921          */
1922
1923         /*
1924          *      Build the reply template from the request.
1925          */
1926
1927         request->reply->sockfd = request->packet->sockfd;
1928         request->reply->dst_ipaddr = request->packet->src_ipaddr;
1929         request->reply->src_ipaddr = request->packet->dst_ipaddr;
1930         request->reply->dst_port = request->packet->src_port;
1931         request->reply->src_port = request->packet->dst_port;
1932         request->reply->id = request->packet->id;
1933         request->reply->code = 0; /* UNKNOWN code */
1934         memcpy(request->reply->vector, request->packet->vector,
1935                sizeof(request->reply->vector));
1936         request->reply->vps = NULL;
1937         request->reply->data = NULL;
1938         request->reply->data_len = 0;
1939
1940         request->master_state = REQUEST_ACTIVE;
1941         request->child_state = REQUEST_QUEUED;
1942         request->next_callback = NULL;
1943
1944         gettimeofday(&request->received, NULL);
1945         request->timestamp = request->received.tv_sec;
1946         request->when = request->received;
1947
1948         request->delay = USEC;
1949
1950         tv_add(&request->when, request->delay);
1951
1952         INSERT_EVENT(wait_a_bit, request);
1953
1954         *prequest = request;
1955         return 1;
1956 }
1957
1958
1959 REQUEST *received_proxy_response(RADIUS_PACKET *packet)
1960 {
1961         char            buffer[128];
1962         home_server     *home;
1963         REQUEST         *request;
1964
1965         if (!home_server_find(&packet->src_ipaddr, packet->src_port)) {
1966                 radlog(L_ERR, "Ignoring request from unknown home server %s port %d",
1967                        inet_ntop(packet->src_ipaddr.af,
1968                                  &packet->src_ipaddr.ipaddr,
1969                                  buffer, sizeof(buffer)),
1970                                packet->src_port);
1971                 rad_free(&packet);
1972                 return NULL;
1973         }
1974
1975         /*
1976          *      Also removes from the proxy hash if responses == requests
1977          */
1978         request = lookup_in_proxy_hash(packet);
1979
1980         if (!request) {
1981                 radlog(L_PROXY, "No outstanding request was found for proxy reply from home server %s port %d - ID %d",
1982                        inet_ntop(packet->src_ipaddr.af,
1983                                  &packet->src_ipaddr.ipaddr,
1984                                  buffer, sizeof(buffer)),
1985                        packet->src_port, packet->id);
1986                 rad_free(&packet);
1987                 return NULL;
1988         }
1989
1990         home = request->home_server;
1991
1992         gettimeofday(&now, NULL);
1993         home->state = HOME_STATE_ALIVE;
1994
1995         if (request->reply && request->reply->code != 0) {
1996                 DEBUG2("We already replied to this request.  Discarding response from home server.");
1997                 rad_free(&packet);
1998                 return NULL;
1999         }
2000
2001         /*
2002          *      We had previously received a reply, so we don't need
2003          *      to do anything here.
2004          */
2005         if (request->proxy_reply) {
2006                 if (memcmp(request->proxy_reply->vector,
2007                            packet->vector,
2008                            sizeof(request->proxy_reply->vector)) == 0) {
2009                         DEBUG2("Discarding duplicate reply from home server %s port %d  - ID: %d for request %d",
2010                                inet_ntop(packet->src_ipaddr.af,
2011                                          &packet->src_ipaddr.ipaddr,
2012                                          buffer, sizeof(buffer)),
2013                                packet->src_port, packet->id,
2014                                request->number);
2015                 } else {
2016                         /*
2017                          *      ? The home server gave us a new proxy
2018                          *      reply, which doesn't match the old
2019                          *      one.  Delete it.
2020                          */
2021                         DEBUG2("Ignoring conflicting proxy reply");
2022                 }
2023
2024                 /* assert that there's an event queued for request? */
2025                 rad_free(&packet);
2026                 return NULL;
2027         }
2028
2029         switch (request->child_state) {
2030         case REQUEST_QUEUED:
2031         case REQUEST_RUNNING:
2032                 rad_panic("Internal sanity check failed for child state");
2033                 break;
2034
2035         case REQUEST_REJECT_DELAY:
2036         case REQUEST_CLEANUP_DELAY:
2037         case REQUEST_DONE:
2038                 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'",
2039                        inet_ntop(packet->src_ipaddr.af,
2040                                  &packet->src_ipaddr.ipaddr,
2041                                  buffer, sizeof(buffer)),
2042                        packet->src_port, packet->id,
2043                        request->number);
2044                 /* assert that there's an event queued for request? */
2045                 rad_free(&packet);
2046                 return NULL;
2047
2048         case REQUEST_PROXIED:
2049                 break;
2050         }
2051
2052         request->proxy_reply = packet;
2053
2054 #if 0
2055         /*
2056          *      Perform RTT calculations, as per RFC 2988 (for TCP).
2057          *      Note that we do so only if we sent one request, and
2058          *      received one response.  If we sent two requests, we
2059          *      have no idea if the response is for the first, or for
2060          *      the second request/
2061          */
2062         if (request->num_proxied_requests == 1) {
2063                 int rtt;
2064                 home_server *home = request->home_server;
2065
2066                 rtt = now.tv_sec - request->proxy_when.tv_sec;
2067                 rtt *= USEC;
2068                 rtt += now.tv_usec;
2069                 rtt -= request->proxy_when.tv_usec;
2070
2071                 if (!home->has_rtt) {
2072                         home->has_rtt = TRUE;
2073
2074                         home->srtt = rtt;
2075                         home->rttvar = rtt / 2;
2076
2077                 } else {
2078                         home->rttvar -= home->rttvar >> 2;
2079                         home->rttvar += (home->srtt - rtt);
2080                         home->srtt -= home->srtt >> 3;
2081                         home->srtt += rtt >> 3;
2082                 }
2083
2084                 home->rto = home->srtt;
2085                 if (home->rttvar > (USEC / 4)) {
2086                         home->rto += home->rttvar * 4;
2087                 } else {
2088                         home->rto += USEC;
2089                 }
2090         }
2091 #endif
2092
2093         /*
2094          *      There's no incoming request, so it's a proxied packet
2095          *      we originated.
2096          */
2097         if (!request->packet) {
2098                 received_response_to_ping(request);
2099                 return NULL;
2100         }
2101
2102         request->child_state = REQUEST_QUEUED;
2103         request->when = now;
2104         request->delay = USEC;
2105         request->priority = RAD_LISTEN_PROXY;
2106         tv_add(&request->when, request->delay);
2107
2108         /*
2109          *      Wait a bit will take care of max_request_time
2110          */
2111         INSERT_EVENT(wait_a_bit, request);
2112
2113         return request;
2114 }
2115
2116
2117 static void event_detail_timer(void *ctx)
2118 {
2119         rad_listen_t *listener = ctx;
2120         RAD_REQUEST_FUNP fun;
2121         REQUEST *request;
2122
2123         if (listener->recv(listener, &fun, &request)) {
2124                 if (!thread_pool_addrequest(request, fun)) {
2125                         request->child_state = REQUEST_DONE;
2126                 }
2127         }
2128 }
2129
2130 static void handle_signal_self(int flag)
2131 {
2132         if ((flag & (RADIUS_SIGNAL_SELF_EXIT | RADIUS_SIGNAL_SELF_TERM)) != 0) {
2133                 if ((flag & RADIUS_SIGNAL_SELF_EXIT) != 0) {
2134                         fr_event_loop_exit(el, 1);
2135                 } else {
2136                         fr_event_loop_exit(el, 2);
2137                 }
2138
2139                 return;
2140         } /* else exit/term flags weren't set */
2141
2142         /*
2143          *      Tell the even loop to stop processing.
2144          */
2145         if ((flag & RADIUS_SIGNAL_SELF_HUP) != 0) {
2146                 time_t when;
2147                 static time_t last_hup = 0;
2148
2149                 DEBUG("Received HUP signal.");
2150
2151                 when = time(NULL);
2152                 if ((int) (when - last_hup) < 5) {
2153                         radlog(L_INFO, "Ignoring HUP (less than 5s since last one)");
2154                         return;
2155                 }
2156                 last_hup = when;
2157
2158                 fr_event_loop_exit(el, 0x80);
2159         }
2160
2161         if ((flag & RADIUS_SIGNAL_SELF_DETAIL) != 0) {
2162                 rad_listen_t *this;
2163
2164                 for (this = mainconfig.listen;
2165                      this != NULL;
2166                      this = this->next) {
2167                         int delay;
2168                         struct timeval when;
2169
2170                         if (this->type != RAD_LISTEN_DETAIL) continue;
2171
2172                         delay = detail_delay(this);
2173                         if (!delay) continue;
2174
2175                         fr_event_now(el, &now);
2176                         when = now;
2177                         tv_add(&when, delay);
2178
2179                         if (delay > 100000) {
2180                                 DEBUG2("Delaying next detail event for %d.%01u seconds.",
2181                                        delay / USEC, (delay % USEC) / 100000);
2182                         }
2183
2184                         if (!fr_event_insert(el, event_detail_timer, this,
2185                                              &when, NULL)) {
2186                                 radlog(L_ERR, "Failed remembering timer");
2187                                 exit(1);
2188                         }
2189                 }
2190         }
2191
2192         if ((flag & RADIUS_SIGNAL_SELF_NEW_FD) != 0) {
2193                 rad_listen_t *this;
2194
2195                 for (this = mainconfig.listen;
2196                      this != NULL;
2197                      this = this->next) {
2198                         if (this->type != RAD_LISTEN_PROXY) continue;
2199
2200                         if (!fr_event_fd_insert(el, 0, this->fd,
2201                                                 event_socket_handler, this)) {
2202                                 radlog(L_ERR, "Failed remembering handle for proxy socket!");
2203                                 exit(1);
2204                         }
2205                 }
2206         }
2207 }
2208
2209 #ifdef __MINGW32__
2210 void radius_signal_self(int flag)
2211 {
2212         handle_signal_self(flag);
2213 }
2214 #else
2215 /*
2216  *      Inform ourselves that we received a signal.
2217  */
2218 void radius_signal_self(int flag)
2219 {
2220         ssize_t rcode;
2221         uint8_t buffer[16];
2222
2223         /*
2224          *      The read MUST be non-blocking for this to work.
2225          */
2226         rcode = read(self_pipe[0], buffer, sizeof(buffer));
2227         if (rcode > 0) {
2228                 ssize_t i;
2229
2230                 for (i = 0; i < rcode; i++) {
2231                         buffer[0] |= buffer[i];
2232                 }
2233         } else {
2234                 buffer[0] = 0;
2235         }
2236
2237         buffer[0] |= flag;
2238
2239         write(self_pipe[1], buffer, 1);
2240 }
2241
2242
2243 static void event_signal_handler(UNUSED fr_event_list_t *xel,
2244                                  UNUSED int fd, UNUSED void *ctx)
2245 {
2246         ssize_t i, rcode;
2247         uint8_t buffer[32];
2248
2249         rcode = read(self_pipe[0], buffer, sizeof(buffer));
2250         if (rcode <= 0) return;
2251
2252         /*
2253          *      Merge pending signals.
2254          */
2255         for (i = 0; i < rcode; i++) {
2256                 buffer[0] |= buffer[i];
2257         }
2258
2259         handle_signal_self(buffer[0]);
2260 }
2261 #endif
2262
2263
2264 static void event_socket_handler(fr_event_list_t *xel, UNUSED int fd,
2265                                  void *ctx)
2266 {
2267         rad_listen_t *listener = ctx;
2268         RAD_REQUEST_FUNP fun;
2269         REQUEST *request;
2270
2271         rad_assert(xel == el);
2272
2273         xel = xel;
2274
2275         if (listener->fd < 0) rad_panic("Socket was closed on us!");
2276
2277         /*
2278          *      FIXME: Put this somewhere else, where it isn't called
2279          *      all of the time...
2280          */
2281 #if !defined(HAVE_PTHREAD_H) && defined(WNOHANG)
2282         /*
2283          *      If there are no child threads, then there may
2284          *      be child processes.  In that case, wait for
2285          *      their exit status, and throw that exit status
2286          *      away.  This helps get rid of zxombie children.
2287          */
2288         while (waitpid(-1, &argval, WNOHANG) > 0) {
2289                 /* do nothing */
2290         }
2291 #endif
2292
2293         if (!listener->recv(listener, &fun, &request)) return;
2294
2295         if (!thread_pool_addrequest(request, fun)) {
2296                 request->child_state = REQUEST_DONE;
2297         }
2298 }
2299
2300
2301 /*
2302  *      This function is called periodically to see if any FD's are
2303  *      available for reading.
2304  */
2305 static void event_poll_fds(UNUSED void *ctx)
2306 {
2307         int rcode;
2308         RAD_REQUEST_FUNP fun;
2309         REQUEST *request;
2310         rad_listen_t *this;
2311         struct timeval when;
2312
2313         fr_event_now(el, &now);
2314         when = now;
2315         when.tv_sec += 1;
2316
2317         for (this = mainconfig.listen; this != NULL; this = this->next) {
2318                 if (this->fd >= 0) continue;
2319
2320                 /*
2321                  *      Try to read something.
2322                  *
2323                  *      FIXME: This does poll AND receive.
2324                  */
2325                 rcode = this->recv(this, &fun, &request);
2326                 if (!rcode) continue;
2327
2328                 rad_assert(fun != NULL);
2329                 rad_assert(request != NULL);
2330
2331                 if (!thread_pool_addrequest(request, fun)) {
2332                         request->child_state = REQUEST_DONE;
2333                 }
2334
2335                 /*
2336                  *      We have an FD.  Start watching it.
2337                  */
2338                 if (this->fd >= 0) {
2339                         /*
2340                          *      ... unless it's a detail file.  In
2341                          *      that case, we rely on the signal to
2342                          *      self to know when to continue
2343                          *      processing the detail file.
2344                          */
2345                         if (this->type == RAD_LISTEN_DETAIL) continue;
2346
2347                         /*
2348                          *      FIXME: this should be SNMP handler,
2349                          *      and we should do SOMETHING when the
2350                          *      fd is closed!
2351                          */
2352                         if (!fr_event_fd_insert(el, 0, this->fd,
2353                                                 event_socket_handler, this)) {
2354                                 char buffer[256];
2355
2356                                 this->print(this, buffer, sizeof(buffer));
2357                                 rad_panic("Failed creating handler for snmp");
2358                         }
2359                 }
2360         }
2361
2362         /*
2363          *      Reset the poll.
2364          */
2365         if (!fr_event_insert(el, event_poll_fds, NULL,
2366                              &when, NULL)) {
2367                 radlog(L_ERR, "Failed creating handler");
2368                 exit(1);
2369         }
2370 }
2371
2372
2373 static void event_status(struct timeval *wake)
2374 {
2375         if (debug_flag == 0) {
2376                 if (just_started) {
2377                         radlog(L_INFO, "Ready to process requests.");
2378                         just_started = FALSE;
2379                 }
2380                 return;
2381         }
2382
2383         if (!wake) {
2384                 DEBUG("Ready to process requests.");
2385
2386         } else if ((wake->tv_sec != 0) ||
2387                    (wake->tv_usec >= 100000)) {
2388                 DEBUG("Waking up in %d.%01u seconds.",
2389                       (int) wake->tv_sec, (unsigned int) wake->tv_usec / 100000);
2390         }
2391 }
2392
2393
2394 /*
2395  *      Externally-visibly functions.
2396  */
2397 int radius_event_init(CONF_SECTION *cs, int spawn_flag)
2398 {
2399         int i;
2400         int has_snmp_listener = FALSE;
2401         rad_listen_t *this, *head = NULL;
2402
2403         if (el) return 0;
2404
2405         time(&start_time);
2406
2407         el = fr_event_list_create(event_status);
2408         if (!el) return 0;
2409
2410         pl = fr_packet_list_create(0);
2411         if (!el) return 0;
2412
2413         request_num_counter = 0;
2414
2415         /*
2416          *      Move all of the thread calls to this file?
2417          *
2418          *      It may be best for the mutexes to be in this file...
2419          */
2420         have_children = spawn_flag;
2421
2422         if (mainconfig.proxy_requests) {
2423                 /*
2424                  *      Create the tree for managing proxied requests and
2425                  *      responses.
2426                  */
2427                 proxy_list = fr_packet_list_create(1);
2428                 if (!proxy_list) return 0;
2429
2430 #ifdef HAVE_PTHREAD_H
2431                 if (pthread_mutex_init(&proxy_mutex, NULL) != 0) {
2432                         radlog(L_ERR, "FATAL: Failed to initialize proxy mutex: %s",
2433                                strerror(errno));
2434                         exit(1);
2435                 }
2436 #endif
2437         }
2438
2439         /*
2440          *      Just before we spawn the child threads, force the log
2441          *      subsystem to re-open the log file for every write.
2442          */
2443         if (spawn_flag) force_log_reopen();
2444
2445 #ifdef HAVE_PTHREAD_H
2446         if (thread_pool_init(cs, spawn_flag) < 0) {
2447                 exit(1);
2448         }
2449 #endif
2450
2451         if (check_config) {
2452                 DEBUG2("%s: #### Skipping IP addresses and Ports ####",
2453                        mainconfig.name);
2454                 return 1;
2455         }
2456
2457 #ifndef __MINGW32__
2458         /*
2459          *      Child threads need a pipe to signal us, as do the
2460          *      signal handlers.
2461          */
2462         if (pipe(self_pipe) < 0) {
2463                 radlog(L_ERR, "radiusd: Error opening internal pipe: %s",
2464                        strerror(errno));
2465                 exit(1);
2466         }
2467         if (fcntl(self_pipe[0], F_SETFL, O_NONBLOCK | FD_CLOEXEC) < 0) {
2468                 radlog(L_ERR, "radiusd: Error setting internal flags: %s",
2469                        strerror(errno));
2470                 exit(1);
2471         }
2472         if (fcntl(self_pipe[1], F_SETFL, O_NONBLOCK | FD_CLOEXEC) < 0) {
2473                 radlog(L_ERR, "radiusd: Error setting internal flags: %s",
2474                        strerror(errno));
2475                 exit(1);
2476         }
2477
2478         if (!fr_event_fd_insert(el, 0, self_pipe[0],
2479                                   event_signal_handler, el)) {
2480                 radlog(L_ERR, "Failed creating handler for signals");
2481                 exit(1);
2482         }
2483 #endif
2484
2485         /*
2486          *      Mark the proxy Fd's as unused.
2487          */
2488         for (i = 0; i < 32; i++) proxy_fds[i] = -1;
2489
2490         DEBUG2("%s: #### Opening IP addresses and Ports ####",
2491                mainconfig.name);
2492
2493         if (listen_init(cs, &head) < 0) {
2494                 _exit(1);
2495         }
2496
2497         /*
2498          *      Add all of the sockets to the event loop.
2499          */
2500         for (this = head;
2501              this != NULL;
2502              this = this->next) {
2503                 char buffer[256];
2504
2505                 this->print(this, buffer, sizeof(buffer));
2506
2507                 switch (this->type) {
2508                 case RAD_LISTEN_DETAIL:
2509                         DEBUG("Listening on %s", buffer);
2510                         has_detail_listener = TRUE;
2511                         break;
2512
2513                 case RAD_LISTEN_SNMP:
2514                         DEBUG("Listening on SNMP %s", buffer);
2515                         has_snmp_listener = TRUE;
2516                         break;
2517
2518                 case RAD_LISTEN_PROXY:
2519                         rad_assert(proxy_fds[this->fd & 0x1f] == -1);
2520                         rad_assert(proxy_listeners[this->fd & 0x1f] == NULL);
2521
2522                         proxy_fds[this->fd & 0x1f] = this->fd;
2523                         proxy_listeners[this->fd & 0x1f] = this;
2524                         if (!fr_packet_list_socket_add(proxy_list,
2525                                                          this->fd)) {
2526                                 rad_assert(0 == 1);
2527                         }
2528                         /* FALL-THROUGH */
2529
2530                 default:
2531                         DEBUG("Listening on %s", buffer);
2532                         break;
2533                 }
2534
2535                 /*
2536                  *      The file descriptor isn't ready.  Poll for
2537                  *      when it will become ready.  This is for SNMP
2538                  *      and detail file fd's.
2539                  */
2540                 if (this->fd < 0) {
2541                         continue;
2542                 }
2543
2544                 /*
2545                  *      The socket is open.  It MUST be a socket,
2546                  *      as we don't pre-open the detail files (yet).
2547                  *
2548                  *      FIXME: if we DO open the detail files automatically,
2549                  *      then much of this code becomes simpler.
2550                  */
2551                 if (!fr_event_fd_insert(el, 0, this->fd,
2552                                           event_socket_handler, this)) {
2553                         this->print(this, buffer, sizeof(buffer));
2554                         radlog(L_ERR, "Failed creating handler for socket %s",
2555                                buffer);
2556                         exit(1);
2557                 }
2558         }
2559
2560         if (has_detail_listener || has_snmp_listener) {
2561                 struct timeval when;
2562
2563                 gettimeofday(&when, NULL);
2564                 when.tv_sec += 1;
2565
2566                 if (!fr_event_insert(el, event_poll_fds, NULL,
2567                                      &when, NULL)) {
2568                         radlog(L_ERR, "Failed creating handler");
2569                         exit(1);
2570                 }
2571         }
2572
2573         mainconfig.listen = head;
2574
2575         return 1;
2576 }
2577
2578
2579 static int request_hash_cb(UNUSED void *ctx, void *data)
2580 {
2581         REQUEST *request = fr_packet2myptr(REQUEST, packet, data);
2582
2583         rad_assert(request->in_proxy_hash == FALSE);
2584
2585         fr_event_delete(el, &request->ev);
2586         remove_from_request_hash(request);
2587         request_free(&request);
2588
2589         return 0;
2590 }
2591
2592
2593 static int proxy_hash_cb(UNUSED void *ctx, void *data)
2594 {
2595         REQUEST *request = fr_packet2myptr(REQUEST, proxy, data);
2596
2597         fr_packet_list_yank(proxy_list, request->proxy);
2598         request->in_proxy_hash = FALSE;
2599
2600         if (!request->in_request_hash) {
2601                 fr_event_delete(el, &request->ev);
2602                 request_free(&request);
2603         }
2604
2605         return 0;
2606 }
2607
2608
2609 void radius_event_free(void)
2610 {
2611         /*
2612          *      FIXME: Stop all threads, or at least check that
2613          *      they're all waiting on the semaphore, and the queues
2614          *      are empty.
2615          */
2616
2617         /*
2618          *      There are requests in the proxy hash that aren't
2619          *      referenced from anywhere else.  Remove them first.
2620          */
2621         if (proxy_list) {
2622                 PTHREAD_MUTEX_LOCK(&proxy_mutex);
2623                 fr_packet_list_walk(proxy_list, NULL, proxy_hash_cb);
2624                 PTHREAD_MUTEX_UNLOCK(&proxy_mutex);
2625                 fr_packet_list_free(proxy_list);
2626                 proxy_list = NULL;
2627         }
2628
2629         fr_packet_list_walk(pl, NULL, request_hash_cb);
2630
2631         fr_packet_list_free(pl);
2632         pl = NULL;
2633
2634         fr_event_list_free(el);
2635 }
2636
2637 int radius_event_process(void)
2638 {
2639         if (!el) return 0;
2640
2641         just_started = TRUE;
2642
2643         return fr_event_loop(el);
2644 }
2645
2646 void radius_handle_request(REQUEST *request, RAD_REQUEST_FUNP fun)
2647 {
2648         if (request_pre_handler(request)) {
2649                 rad_assert(fun != NULL);
2650                 rad_assert(request != NULL);
2651
2652                 if (request->server) DEBUG("server %s {",
2653                                              request->server);
2654                 fun(request);
2655
2656                 if (request->server) DEBUG("} # server %s",
2657                                              request->server);
2658
2659                 request_post_handler(request);
2660         }
2661
2662         DEBUG2("Going to the next request");
2663         return;
2664 }