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
  48 /*
  49  *      Ridiculous amounts of local state.
  50  */
  51 static fr_event_list_t  *el = NULL;
  52 static fr_packet_list_t *pl = NULL;
  53 static int                      request_num_counter = 0;
  54 static struct timeval           now;
  55 static time_t                   start_time;
  56 static int                      have_children;
  57 static int                      has_detail_listener = FALSE;
  58 static int                      just_started = FALSE;
  59
  60 #ifndef __MINGW32__
  61 static int self_pipe[2];
  62 #endif
  63
  64 #ifdef HAVE_PTHREAD_H
  65 static pthread_mutex_t  proxy_mutex;
  66
  67 #define PTHREAD_MUTEX_LOCK if (have_children) pthread_mutex_lock
  68 #define PTHREAD_MUTEX_UNLOCK if (have_children) pthread_mutex_unlock
  69 #else
  70 /*
  71  *      This is easier than ifdef's throughout the code.
  72  */
  73 #define PTHREAD_MUTEX_LOCK(_x)
  74 #define PTHREAD_MUTEX_UNLOCK(_x)
  75 #endif
  76
  77 #define INSERT_EVENT(_function, _ctx) if (!fr_event_insert(el, _function, _ctx, &((_ctx)->when), &((_ctx)->ev))) { _rad_panic(__FILE__, __LINE__, "Failed to insert event"); }
  78
  79 static fr_packet_list_t *proxy_list = NULL;
  80
  81 /*
  82  *      We keep the proxy FD's here.  The RADIUS Id's are marked
  83  *      "allocated" per Id, via a bit per proxy FD.
  84  */
  85 static int              proxy_fds[32];
  86 static rad_listen_t     *proxy_listeners[32];
  87
  88 static void request_post_handler(REQUEST *request);
  89 static void wait_a_bit(void *ctx);
  90 static void event_socket_handler(fr_event_list_t *xel, UNUSED int fd, void *ctx);
  91
  92 static void NEVER_RETURNS _rad_panic(const char *file, unsigned int line,
  93                                     const char *msg)
  94 {
  95         radlog(L_ERR, "[%s:%d] %s", file, line, msg);
  96         _exit(1);
  97 }
  98
  99 #define rad_panic(x) _rad_panic(__FILE__, __LINE__, x)
 100
 101
 102 static void tv_add(struct timeval *tv, int usec_delay)
 103 {
 104         if (usec_delay > USEC) {
 105                 tv->tv_sec += usec_delay / USEC;
 106                 usec_delay %= USEC;
 107         }
 108         tv->tv_usec += usec_delay;
 109
 110         if (tv->tv_usec > USEC) {
 111                 tv->tv_usec -= USEC;
 112                 tv->tv_sec++;
 113         }
 114 }
 115
 116 #ifdef WITH_SNMP
 117 static void snmp_inc_counters(REQUEST *request)
 118 {
 119         if (!request->root->do_snmp) return;
 120
 121         if (request->master_state == REQUEST_COUNTED) return;
 122
 123         if ((request->listener->type != RAD_LISTEN_AUTH) &&
 124             (request->listener->type != RAD_LISTEN_ACCT)) return;
 125
 126         /*
 127          *      Update the SNMP statistics.
 128          *
 129          *      Note that we do NOT do this in a child thread.
 130          *      Instead, we update the stats when a request is
 131          *      deleted, because only the main server thread calls
 132          *      this function, which makes it thread-safe.
 133          */
 134         switch (request->reply->code) {
 135         case PW_AUTHENTICATION_ACK:
 136                 rad_snmp.auth.total_responses++;
 137                 rad_snmp.auth.total_access_accepts++;
 138                 if (request->client && request->client->auth) {
 139                         request->client->auth->accepts++;
 140                 }
 141                 break;
 142
 143         case PW_AUTHENTICATION_REJECT:
 144                 rad_snmp.auth.total_responses++;
 145                 rad_snmp.auth.total_access_rejects++;
 146                 if (request->client && request->client->auth) {
 147                         request->client->auth->rejects++;
 148                 }
 149                 break;
 150
 151         case PW_ACCESS_CHALLENGE:
 152                 rad_snmp.auth.total_responses++;
 153                 rad_snmp.auth.total_access_challenges++;
 154                 if (request->client && request->client->auth) {
 155                         request->client->auth->challenges++;
 156                 }
 157                 break;
 158
 159         case PW_ACCOUNTING_RESPONSE:
 160                 rad_snmp.acct.total_responses++;
 161                 if (request->client && request->client->acct) {
 162                         request->client->acct->responses++;
 163                 }
 164                 break;
 165
 166                 /*
 167                  *      No response, it must have been a bad
 168                  *      authenticator.
 169                  */
 170         case 0:
 171                 if (request->packet->code == PW_AUTHENTICATION_REQUEST) {
 172                         rad_snmp.auth.total_bad_authenticators++;
 173                         if (request->client && request->client->auth) {
 174                                 request->client->auth->bad_authenticators++;
 175                         }
 176                 }
 177                 break;
 178
 179         default:
 180                 break;
 181         }
 182
 183         request->master_state = REQUEST_COUNTED;
 184 }
 185 #else
 186 #define snmp_inc_counters(_x)
 187 #endif
 188
 189
 190 static void remove_from_request_hash(REQUEST *request)
 191 {
 192         if (!request->in_request_hash) return;
 193
 194         fr_packet_list_yank(pl, request->packet);
 195         request->in_request_hash = FALSE;
 196
 197         snmp_inc_counters(request);
 198 }
 199
 200
 201 static REQUEST *lookup_in_proxy_hash(RADIUS_PACKET *reply)
 202 {
 203         RADIUS_PACKET **proxy_p;
 204         REQUEST *request;
 205
 206         PTHREAD_MUTEX_LOCK(&proxy_mutex);
 207         proxy_p = fr_packet_list_find_byreply(proxy_list, reply);
 208
 209         if (!proxy_p) {
 210                 PTHREAD_MUTEX_UNLOCK(&proxy_mutex);
 211                 return NULL;
 212         }
 213
 214         request = fr_packet2myptr(REQUEST, proxy, proxy_p);
 215
 216         if (!request) {
 217                 PTHREAD_MUTEX_UNLOCK(&proxy_mutex);
 218                 return NULL;
 219         }
 220
 221         request->num_proxied_responses++;
 222
 223         /*
 224          *      Catch the most common case of everything working
 225          *      correctly.
 226          */
 227         if (request->num_proxied_requests == request->num_proxied_responses) {
 228                 fr_packet_list_yank(proxy_list, request->proxy);
 229                 fr_packet_list_id_free(proxy_list, request->proxy);
 230                 request->in_proxy_hash = FALSE;
 231         }
 232
 233         /*
 234          *      On the FIRST reply, decrement the count of outstanding
 235          *      requests.  Note that this is NOT the count of sent
 236          *      packets, but whether or not the home server has
 237          *      responded at all.
 238          */
 239         if (!request->proxy_reply &&
 240             request->home_server->currently_outstanding) {
 241                 request->home_server->currently_outstanding--;
 242         }
 243
 244         PTHREAD_MUTEX_UNLOCK(&proxy_mutex);
 245
 246         return request;
 247 }
 248
 249
 250 static void remove_from_proxy_hash(REQUEST *request)
 251 {
 252         if (!request->in_proxy_hash) return;
 253
 254         PTHREAD_MUTEX_LOCK(&proxy_mutex);
 255         fr_packet_list_yank(proxy_list, request->proxy);
 256         fr_packet_list_id_free(proxy_list, request->proxy);
 257
 258         /*
 259          *      The home server hasn't replied, but we've given up on
 260          *      this request.  Don't count this request against the
 261          *      home server.
 262          */
 263         if (!request->proxy_reply &&
 264             request->home_server->currently_outstanding) {
 265                 request->home_server->currently_outstanding--;
 266         }
 267
 268         PTHREAD_MUTEX_UNLOCK(&proxy_mutex);
 269
 270         request->in_proxy_hash = FALSE;
 271 }
 272
 273
 274 static int insert_into_proxy_hash(REQUEST *request)
 275 {
 276         int i, proxy;
 277         char buf[128];
 278
 279         rad_assert(request->proxy != NULL);
 280         rad_assert(proxy_list != NULL);
 281
 282         request->proxy->sockfd = -1;
 283
 284         PTHREAD_MUTEX_LOCK(&proxy_mutex);
 285
 286         request->home_server->currently_outstanding++;
 287         request->home_server->total_requests_sent++;
 288
 289         /*
 290          *      On overflow, back up to ~0.
 291          */
 292         if (!request->home_server->total_requests_sent) {
 293                 request->home_server->total_requests_sent--;
 294         }
 295
 296         if (!fr_packet_list_id_alloc(proxy_list, request->proxy)) {
 297                 int found;
 298                 rad_listen_t *proxy_listener;
 299
 300                 /*
 301                  *      Allocate a new proxy fd.  This function adds
 302                  *      it to the tail of the list of listeners.  With
 303                  *      some care, this can be thread-safe.
 304                  */
 305                 proxy_listener = proxy_new_listener();
 306                 if (!proxy_listener) {
 307                         PTHREAD_MUTEX_UNLOCK(&proxy_mutex);
 308                         DEBUG2("ERROR: Failed to create a new socket for proxying requests.");
 309                         return 0;
 310                 }
 311
 312                 /*
 313                  *      Cache it locally.
 314                  */
 315                 found = -1;
 316                 proxy = proxy_listener->fd;
 317                 for (i = 0; i < 32; i++) {
 318                         /*
 319                          *      Found a free entry.  Save the socket,
 320                          *      and remember where we saved it.
 321                          */
 322                         if (proxy_fds[(proxy + i) & 0x1f] == -1) {
 323                                 found = (proxy + i) & 0x1f;
 324                                 proxy_fds[found] = proxy;
 325                                 proxy_listeners[found] = proxy_listener;
 326                                 break;
 327                         }
 328                 }
 329                 rad_assert(found >= 0);
 330
 331                 if (!fr_packet_list_socket_add(proxy_list, proxy_listener->fd)) {
 332                         PTHREAD_MUTEX_UNLOCK(&proxy_mutex);
 333                         DEBUG2("ERROR: Failed to create a new socket for proxying requests.");
 334                         return 0;
 335
 336                 }
 337
 338                 if (!fr_packet_list_id_alloc(proxy_list, request->proxy)) {
 339                         PTHREAD_MUTEX_UNLOCK(&proxy_mutex);
 340                         DEBUG2("ERROR: Failed to create a new socket for proxying requests.");
 341                         return 0;
 342                 }
 343
 344                 /*
 345                  *      Signal the main thread to add the new FD to the list
 346                  *      of listening FD's.
 347                  */
 348                 radius_signal_self(RADIUS_SIGNAL_SELF_NEW_FD);
 349         }
 350         rad_assert(request->proxy->sockfd >= 0);
 351
 352         /*
 353          *      FIXME: Hack until we get rid of rad_listen_t, and put
 354          *      the information into the packet_list.
 355          */
 356         proxy = -1;
 357         for (i = 0; i < 32; i++) {
 358                 if (proxy_fds[i] == request->proxy->sockfd) {
 359                         proxy = i;
 360                         break;
 361                 }
 362         }
 363
 364         if (proxy < 0) {
 365                 PTHREAD_MUTEX_UNLOCK(&proxy_mutex);
 366                 DEBUG2("ERROR: All sockets are full.");
 367                 return 0;
 368         }
 369
 370         rad_assert(proxy_fds[proxy] != -1);
 371         rad_assert(proxy_listeners[proxy] != NULL);
 372         request->proxy_listener = proxy_listeners[proxy];
 373
 374         if (!fr_packet_list_insert(proxy_list, &request->proxy)) {
 375                 fr_packet_list_id_free(proxy_list, request->proxy);
 376                 PTHREAD_MUTEX_UNLOCK(&proxy_mutex);
 377                 DEBUG2("ERROR: Failed to insert entry into proxy list");
 378                 return 0;
 379         }
 380
 381         PTHREAD_MUTEX_UNLOCK(&proxy_mutex);
 382
 383         DEBUG3(" proxy: allocating destination %s port %d - Id %d",
 384                inet_ntop(request->proxy->dst_ipaddr.af,
 385                          &request->proxy->dst_ipaddr.ipaddr, buf, sizeof(buf)),
 386                request->proxy->dst_port,
 387                request->proxy->id);
 388
 389         request->in_proxy_hash = TRUE;
 390
 391         return 1;
 392 }
 393
 394
 395 /*
 396  *      Called as BOTH an event, and in-line from other functions.
 397  */
 398 static void wait_for_proxy_id_to_expire(void *ctx)
 399 {
 400         REQUEST *request = ctx;
 401         home_server *home = request->home_server;
 402
 403         rad_assert(request->magic == REQUEST_MAGIC);
 404         rad_assert(request->proxy != NULL);
 405
 406         if (!fr_event_now(el, &now)) gettimeofday(&now, NULL);
 407         request->when = request->proxy_when;
 408         request->when.tv_sec += home->response_window;
 409
 410         if ((request->num_proxied_requests == request->num_proxied_responses) ||
 411             timercmp(&now, &request->when, >)) {
 412                 if (request->packet) {
 413                         DEBUG2("Cleaning up request %d ID %d with timestamp +%d",
 414                                request->number, request->packet->id,
 415                                (unsigned int) (request->timestamp - start_time));
 416                 } else {
 417                         DEBUG2("Cleaning up request %d with timestamp +%d",
 418                                request->number,
 419                                (unsigned int) (request->timestamp - start_time));
 420                 }
 421                 fr_event_delete(el, &request->ev);
 422                 remove_from_proxy_hash(request);
 423                 remove_from_request_hash(request);
 424                 request_free(&request);
 425                 return;
 426         }
 427
 428         INSERT_EVENT(wait_for_proxy_id_to_expire, request);
 429 }
 430
 431
 432 static void wait_for_child_to_die(void *ctx)
 433 {
 434         REQUEST *request = ctx;
 435
 436         rad_assert(request->magic == REQUEST_MAGIC);
 437
 438         if ((request->child_state == REQUEST_QUEUED) |
 439             (request->child_state == REQUEST_RUNNING)) {
 440                 request->delay += (request->delay >> 1);
 441                 tv_add(&request->when, request->delay);
 442
 443                 DEBUG2("Child is still stuck for request %d", request->number);
 444
 445                 INSERT_EVENT(wait_for_child_to_die, request);
 446                 return;
 447         }
 448
 449         DEBUG2("Child is finally responsive for request %d", request->number);
 450         remove_from_request_hash(request);
 451
 452         if (request->proxy) {
 453                 wait_for_proxy_id_to_expire(request);
 454                 return;
 455         }
 456
 457         request_free(&request);
 458 }
 459
 460
 461 static void cleanup_delay(void *ctx)
 462 {
 463         REQUEST *request = ctx;
 464
 465         rad_assert(request->magic == REQUEST_MAGIC);
 466         rad_assert((request->child_state == REQUEST_CLEANUP_DELAY) ||
 467                    (request->child_state == REQUEST_DONE));
 468
 469         remove_from_request_hash(request);
 470
 471         if (request->proxy && request->in_proxy_hash) {
 472                 wait_for_proxy_id_to_expire(request);
 473                 return;
 474         }
 475
 476         DEBUG2("Cleaning up request %d ID %d with timestamp +%d",
 477                request->number, request->packet->id,
 478                (unsigned int) (request->timestamp - start_time));
 479
 480         fr_event_delete(el, &request->ev);
 481         request_free(&request);
 482 }
 483
 484
 485 static void reject_delay(void *ctx)
 486 {
 487         REQUEST *request = ctx;
 488
 489         rad_assert(request->magic == REQUEST_MAGIC);
 490         rad_assert(request->child_state == REQUEST_REJECT_DELAY);
 491
 492         DEBUG2("Sending delayed reject for request %d", request->number);
 493
 494         request->listener->send(request->listener, request);
 495
 496         request->when.tv_sec += request->root->cleanup_delay;
 497         request->child_state = REQUEST_CLEANUP_DELAY;
 498
 499         INSERT_EVENT(cleanup_delay, request);
 500 }
 501
 502
 503 static void revive_home_server(void *ctx)
 504 {
 505         home_server *home = ctx;
 506
 507         home->state = HOME_STATE_ALIVE;
 508         DEBUG2("Marking home server alive again... we have no idea if it really is alive or not.");
 509         home->currently_outstanding = 0;
 510 }
 511
 512
 513 static void no_response_to_ping(void *ctx)
 514 {
 515         REQUEST *request = ctx;
 516         home_server *home = request->home_server;
 517         char buffer[128];
 518
 519         home->num_received_pings = 0;
 520
 521         DEBUG2("No response to status check %d from home server %s port %d",
 522                request->number,
 523                inet_ntop(request->proxy->dst_ipaddr.af,
 524                          &request->proxy->dst_ipaddr.ipaddr,
 525                          buffer, sizeof(buffer)),
 526                request->proxy->dst_port);
 527
 528         wait_for_proxy_id_to_expire(request);
 529 }
 530
 531
 532 static void received_response_to_ping(REQUEST *request)
 533 {
 534         home_server *home = request->home_server;
 535         char buffer[128];
 536
 537         home->num_received_pings++;
 538
 539         DEBUG2("Received response to status check %d (%d in current sequence)",
 540                request->number, home->num_received_pings);
 541
 542         if (home->num_received_pings < home->num_pings_to_alive) {
 543                 wait_for_proxy_id_to_expire(request);
 544                 return;
 545         }
 546
 547         DEBUG2("Marking home server %s port %d alive",
 548                inet_ntop(request->proxy->dst_ipaddr.af,
 549                          &request->proxy->dst_ipaddr.ipaddr,
 550                          buffer, sizeof(buffer)),
 551                request->proxy->dst_port);
 552
 553         if (!fr_event_delete(el, &home->ev)) {
 554                 DEBUG2("Hmm... no event for home server, WTF?");
 555         }
 556
 557         if (!fr_event_delete(el, &request->ev)) {
 558                 DEBUG2("Hmm... no event for request, WTF?");
 559         }
 560
 561         wait_for_proxy_id_to_expire(request);
 562
 563         home->state = HOME_STATE_ALIVE;
 564         home->currently_outstanding = 0;
 565 }
 566
 567
 568 static void ping_home_server(void *ctx)
 569 {
 570         uint32_t jitter;
 571         home_server *home = ctx;
 572         REQUEST *request;
 573         VALUE_PAIR *vp;
 574
 575         if (home->state == HOME_STATE_ALIVE) {
 576                 radlog(L_INFO, "Suspicious proxy state... continuing");
 577                 return;
 578         }
 579
 580         request = request_alloc();
 581         request->number = request_num_counter++;
 582
 583         request->proxy = rad_alloc(1);
 584         rad_assert(request->proxy != NULL);
 585
 586         fr_event_now(el, &request->when);
 587         home->when = request->when;
 588
 589         if (home->ping_check == HOME_PING_CHECK_STATUS_SERVER) {
 590                 request->proxy->code = PW_STATUS_SERVER;
 591
 592                 radius_pairmake(request, &request->proxy->vps,
 593                                 "Message-Authenticator", "0x00", T_OP_SET);
 594
 595         } else if (home->type == HOME_TYPE_AUTH) {
 596                 request->proxy->code = PW_AUTHENTICATION_REQUEST;
 597
 598                 radius_pairmake(request, &request->proxy->vps,
 599                                 "User-Name", home->ping_user_name, T_OP_SET);
 600                 radius_pairmake(request, &request->proxy->vps,
 601                                 "User-Password", home->ping_user_password, T_OP_SET);
 602                 radius_pairmake(request, &request->proxy->vps,
 603                                 "Service-Type", "Authenticate-Only", T_OP_SET);
 604                 radius_pairmake(request, &request->proxy->vps,
 605                                 "Message-Authenticator", "0x00", T_OP_SET);
 606
 607         } else {
 608                 request->proxy->code = PW_ACCOUNTING_REQUEST;
 609
 610                 radius_pairmake(request, &request->proxy->vps,
 611                                 "User-Name", home->ping_user_name, T_OP_SET);
 612                 radius_pairmake(request, &request->proxy->vps,
 613                                 "Acct-Status-Type", "Stop", T_OP_SET);
 614                 radius_pairmake(request, &request->proxy->vps,
 615                                 "Acct-Session-Id", "00000000", T_OP_SET);
 616                 vp = radius_pairmake(request, &request->proxy->vps,
 617                                      "Event-Timestamp", "0", T_OP_SET);
 618                 vp->vp_date = now.tv_sec;
 619         }
 620
 621         radius_pairmake(request, &request->proxy->vps,
 622                         "NAS-Identifier", "Status Check. Are you alive?",
 623                         T_OP_SET);
 624
 625         request->proxy->dst_ipaddr = home->ipaddr;
 626         request->proxy->dst_port = home->port;
 627         request->home_server = home;
 628
 629         rad_assert(request->proxy_listener == NULL);
 630
 631         if (!insert_into_proxy_hash(request)) {
 632                 DEBUG2("ERROR: Failed inserting status check %d into proxy hash.  Discarding it.",
 633                        request->number);
 634                 request_free(&request);
 635                 return;
 636         }
 637         rad_assert(request->proxy_listener != NULL);
 638         request->proxy_listener->send(request->proxy_listener,
 639                                       request);
 640
 641         request->next_callback = NULL;
 642         request->child_state = REQUEST_PROXIED;
 643         request->when.tv_sec += home->ping_timeout;;
 644
 645         INSERT_EVENT(no_response_to_ping, request);
 646
 647         /*
 648          *      Add +/- 2s of jitter, as suggested in RFC 3539
 649          *      and in the Issues and Fixes draft.
 650          */
 651         home->when.tv_sec += home->ping_interval - 2;
 652
 653         jitter = fr_rand();
 654         jitter ^= (jitter >> 10);
 655         jitter &= ((1 << 23) - 1); /* 22 bits of 1 */
 656
 657         tv_add(&home->when, jitter);
 658
 659
 660         INSERT_EVENT(ping_home_server, home);
 661 }
 662
 663
 664 static void check_for_zombie_home_server(REQUEST *request)
 665 {
 666         home_server *home;
 667         struct timeval when;
 668         char buffer[128];
 669
 670         home = request->home_server;
 671
 672         if (home->state != HOME_STATE_ZOMBIE) return;
 673
 674         when = home->zombie_period_start;
 675         when.tv_sec += home->zombie_period;
 676
 677         fr_event_now(el, &now);
 678         if (timercmp(&now, &when, <)) {
 679                 return;
 680         }
 681
 682         /*
 683          *      It's been a zombie for too long, mark it as
 684          *      dead.
 685          */
 686         DEBUG2("FAILURE: Marking home server %s port %d as dead.",
 687                inet_ntop(request->proxy->dst_ipaddr.af,
 688                          &request->proxy->dst_ipaddr.ipaddr,
 689                          buffer, sizeof(buffer)),
 690                request->proxy->dst_port);
 691         home->state = HOME_STATE_IS_DEAD;
 692         home->num_received_pings = 0;
 693         home->when = request->when;
 694
 695         if (home->ping_check != HOME_PING_CHECK_NONE) {
 696                 rad_assert((home->ping_check == HOME_PING_CHECK_STATUS_SERVER) ||
 697                            (home->ping_user_name != NULL));
 698                 home->when.tv_sec += home->ping_interval;
 699
 700                 INSERT_EVENT(ping_home_server, home);
 701         } else {
 702                 home->when.tv_sec += home->revive_interval;
 703
 704                 INSERT_EVENT(revive_home_server, home);
 705         }
 706 }
 707
 708
 709 static int setup_post_proxy_fail(REQUEST *request)
 710 {
 711         DICT_VALUE *dval = NULL;
 712         VALUE_PAIR *vp;
 713
 714         if (request->packet->code == PW_AUTHENTICATION_REQUEST) {
 715                 dval = dict_valbyname(PW_POST_PROXY_TYPE, "Fail-Authentication");
 716
 717         } else if (request->packet->code == PW_ACCOUNTING_REQUEST) {
 718                 dval = dict_valbyname(PW_POST_PROXY_TYPE, "Fail-Accounting");
 719
 720         } else {
 721                 return 0;
 722         }
 723
 724         if (!dval) dval = dict_valbyname(PW_POST_PROXY_TYPE, "Fail");
 725
 726         if (!dval) {
 727                 pairdelete(&request->config_items, PW_POST_PROXY_TYPE);
 728                 return 0;
 729         }
 730
 731         vp = pairfind(request->config_items, PW_POST_PROXY_TYPE);
 732         if (!vp) vp = radius_paircreate(request, &request->config_items,
 733                                         PW_POST_PROXY_TYPE, PW_TYPE_INTEGER);
 734         vp->vp_integer = dval->value;
 735
 736         rad_assert(request->proxy_reply == NULL);
 737
 738         return 1;
 739 }
 740
 741
 742 static int null_handler(UNUSED REQUEST *request)
 743 {
 744         return 0;
 745 }
 746
 747 static void post_proxy_fail_handler(REQUEST *request)
 748 {
 749         /*
 750          *      A proper time is required for wait_a_bit.
 751          */
 752         request->delay = USEC / 10;
 753         gettimeofday(&now, NULL);
 754
 755         /*
 756          *      Not set up to run Post-Proxy-Type = Fail.
 757          *
 758          *      Mark the request as still running, and figure out what
 759          *      to do next.
 760          */
 761         if (!setup_post_proxy_fail(request)) {
 762                 request->child_state = REQUEST_RUNNING;
 763                 request_post_handler(request);
 764
 765         } else {
 766                 /*
 767                  *      Re-queue the request.
 768                  */
 769                 request->child_state = REQUEST_QUEUED;
 770
 771                 /*
 772                  *      There is a post-proxy-type of fail.  We run
 773                  *      the request through the pre/post proxy
 774                  *      handlers, just like it was a real proxied
 775                  *      request.  However, we set the per-request
 776                  *      handler to NULL, as we don't want to do
 777                  *      anything else.
 778                  *
 779                  *      Note that when we're not threaded, this will
 780                  *      process the request even if it's greater than
 781                  *      max_request_time.  That's not fatal.
 782                  */
 783                 request->priority = 0;
 784                 rad_assert(request->proxy != NULL);
 785                 thread_pool_addrequest(request, null_handler);
 786
 787         }
 788
 789         /*
 790          *      MAY free the request if we're over max_request_time,
 791          *      AND we're not in threaded mode!
 792          */
 793         wait_a_bit(request);
 794 }
 795
 796
 797 /* maybe check this against wait_for_proxy_id_to_expire? */
 798 static void no_response_to_proxied_request(void *ctx)
 799 {
 800         REQUEST *request = ctx;
 801         home_server *home;
 802         char buffer[128];
 803
 804         rad_assert(request->magic == REQUEST_MAGIC);
 805         rad_assert(request->child_state == REQUEST_PROXIED);
 806
 807         radlog(L_ERR, "Rejecting request %d due to lack of any response from home server %s port %d",
 808                request->number,
 809                inet_ntop(request->proxy->dst_ipaddr.af,
 810                          &request->proxy->dst_ipaddr.ipaddr,
 811                          buffer, sizeof(buffer)),
 812                request->proxy->dst_port);
 813
 814         check_for_zombie_home_server(request);
 815
 816         home = request->home_server;
 817
 818         post_proxy_fail_handler(request);
 819
 820         /*
 821          *      Don't touch request due to race conditions
 822          */
 823         if (home->state == HOME_STATE_IS_DEAD) {
 824                 rad_assert(home->ev != NULL); /* or it will never wake up */
 825                 return;
 826         }
 827
 828         /*
 829          *      Enable the zombie period when we notice that the home
 830          *      server hasn't responded.  We also back-date the start
 831          *      of the zombie period to when the proxied request was
 832          *      sent.
 833          */
 834         if (home->state == HOME_STATE_ALIVE) {
 835                 DEBUG2("WARNING: Marking home server %s port %d as zombie (it looks like it is dead).",
 836                        inet_ntop(home->ipaddr.af, &home->ipaddr.ipaddr,
 837                                  buffer, sizeof(buffer)),
 838                        home->port);
 839                 home->state = HOME_STATE_ZOMBIE;
 840                 home->zombie_period_start = now;
 841                 home->zombie_period_start.tv_sec -= home->response_window;
 842                 return;
 843         }
 844 }
 845
 846
 847 static void wait_a_bit(void *ctx)
 848 {
 849         struct timeval when;
 850         REQUEST *request = ctx;
 851         fr_event_callback_t callback = NULL;
 852
 853         rad_assert(request->magic == REQUEST_MAGIC);
 854
 855         switch (request->child_state) {
 856         case REQUEST_QUEUED:
 857         case REQUEST_RUNNING:
 858                 when = request->received;
 859                 when.tv_sec += request->root->max_request_time;
 860
 861                 /*
 862                  *      Normally called from the event loop with the
 863                  *      proper event loop time.  Otherwise, called from
 864                  *      post proxy fail handler, which sets "now", and
 865                  *      this call won't re-set it, because we're not
 866                  *      in the event loop.
 867                  */
 868                 fr_event_now(el, &now);
 869
 870                 /*
 871                  *      Request still has more time.  Continue
 872                  *      waiting.
 873                  */
 874                 if (timercmp(&now, &when, <)) {
 875                         if (request->delay < (USEC / 10)) {
 876                                 request->delay = USEC / 10;
 877                         }
 878                         request->delay += request->delay >> 1;
 879                         request->when = now;
 880                         tv_add(&request->when, request->delay);
 881                         callback = wait_a_bit;
 882                         break;
 883                 }
 884
 885                 /*
 886                  *      A child thread MAY still be running on the
 887                  *      request.  Ask the thread to stop working on
 888                  *      the request.
 889                  */
 890                 if (have_children) {
 891                         /* FIXME: kill unresponsive children? */
 892
 893                         /*
 894                          *      Print this error message ONLY if
 895                          *      there's a child currently processing
 896                          *      the request.  As we don't have thread
 897                          *      locks here, there may be race
 898                          *      conditions on this check.  But it's
 899                          *      just an error message, so that's OK.
 900                          */
 901                         if (request->child_pid != NO_SUCH_CHILD_PID) {
 902                                 radlog(L_ERR, "WARNING: Unresponsive child (id %lu) for request %d, in module %s component %s",
 903                                (unsigned long)request->child_pid, request->number,
 904                                        request->module ? request->module : "<server core>",
 905                                        request->component ? request->component : "<server core>");
 906                         }
 907
 908                         request->master_state = REQUEST_STOP_PROCESSING;
 909
 910                         request->delay = USEC / 4;
 911                         tv_add(&request->when, request->delay);
 912                         callback = wait_for_child_to_die;
 913                         break;
 914                 }
 915
 916                 /*
 917                  *      Else there are no child threads.  We probably
 918                  *      should have just marked the request as 'done'
 919                  *      elsewhere, like in the post-proxy-fail
 920                  *      handler.  But doing that would involve
 921                  *      checking for max_request_time in multiple
 922                  *      places, so this may be simplest.
 923                  */
 924                 request->child_state = REQUEST_DONE;
 925                 /* FALL-THROUGH */
 926
 927                 /*
 928                  *      Mark the request as no longer running,
 929                  *      and clean it up.
 930                  */
 931         case REQUEST_DONE:
 932                 request->child_pid = NO_SUCH_CHILD_PID;
 933                 snmp_inc_counters(request);
 934                 cleanup_delay(request);
 935                 return;
 936
 937         case REQUEST_REJECT_DELAY:
 938         case REQUEST_CLEANUP_DELAY:
 939                 request->child_pid = NO_SUCH_CHILD_PID;
 940                 snmp_inc_counters(request);
 941
 942         case REQUEST_PROXIED:
 943                 rad_assert(request->next_callback != NULL);
 944                 rad_assert(request->next_callback != wait_a_bit);
 945
 946                 request->when = request->next_when;
 947                 callback = request->next_callback;
 948                 request->next_callback = NULL;
 949                 break;
 950
 951         default:
 952                 rad_panic("Internal sanity check failure");
 953                 return;
 954         }
 955
 956         INSERT_EVENT(callback, request);
 957 }
 958
 959
 960 static int request_pre_handler(REQUEST *request)
 961 {
 962         int rcode;
 963
 964         rad_assert(request->magic == REQUEST_MAGIC);
 965         rad_assert(request->packet != NULL);
 966         rad_assert(request->packet->dst_port != 0);
 967
 968         request->child_state = REQUEST_RUNNING;
 969
 970         /*
 971          *      Don't decode the packet if it's an internal "fake"
 972          *      request.  Instead, just return so that the caller can
 973          *      process it.
 974          */
 975         if (request->packet->dst_port == 0) {
 976                 request->username = pairfind(request->packet->vps,
 977                                              PW_USER_NAME);
 978                 request->password = pairfind(request->packet->vps,
 979                                              PW_USER_PASSWORD);
 980                 return 1;
 981         }
 982
 983         /*
 984          *      Put the decoded packet into it's proper place.
 985          */
 986         if (request->proxy_reply != NULL) {
 987                 rcode = request->proxy_listener->decode(request->proxy_listener,
 988                                                         request);
 989         } else if (request->packet->vps == NULL) {
 990                 rcode = request->listener->decode(request->listener, request);
 991
 992         } else {
 993                 rcode = 0;
 994         }
 995
 996         if (rcode < 0) {
 997                 radlog(L_ERR, "%s Dropping packet without response.", librad_errstr);
 998                 request->child_state = REQUEST_DONE;
 999                 return 0;
1000         }
1001
1002         if (!request->proxy) {
1003                 request->username = pairfind(request->packet->vps,
1004                                              PW_USER_NAME);
1005
1006         } else {
1007                 int post_proxy_type = 0;
1008                 VALUE_PAIR *vp;
1009
1010                 /*
1011                  *      Delete any reply we had accumulated until now.
1012                  */
1013                 pairfree(&request->reply->vps);
1014
1015                 /*
1016                  *      Run the packet through the post-proxy stage,
1017                  *      BEFORE playing games with the attributes.
1018                  */
1019                 vp = pairfind(request->config_items, PW_POST_PROXY_TYPE);
1020                 if (vp) {
1021                         DEBUG2("  Found Post-Proxy-Type %s", vp->vp_strvalue);
1022                         post_proxy_type = vp->vp_integer;
1023                 }
1024
1025                 rad_assert(request->home_pool != NULL);
1026
1027                 if (request->home_pool->virtual_server) {
1028                         const char *old_server = request->server;
1029
1030                         request->server = request->home_pool->virtual_server;
1031                         DEBUG2(" server %s {", request->server);
1032                         rcode = module_post_proxy(post_proxy_type, request);
1033                         DEBUG2(" }");
1034                         request->server = old_server;
1035                 } else {
1036                         rcode = module_post_proxy(post_proxy_type, request);
1037                 }
1038
1039                 /*
1040                  *      There may NOT be a proxy reply, as we may be
1041                  *      running Post-Proxy-Type = Fail.
1042                  */
1043                 if (request->proxy_reply) {
1044                         /*
1045                          *      Delete the Proxy-State Attributes from
1046                          *      the reply.  These include Proxy-State
1047                          *      attributes from us and remote server.
1048                          */
1049                         pairdelete(&request->proxy_reply->vps, PW_PROXY_STATE);
1050
1051                         /*
1052                          *      Add the attributes left in the proxy
1053                          *      reply to the reply list.
1054                          */
1055                         pairadd(&request->reply->vps, request->proxy_reply->vps);
1056                         request->proxy_reply->vps = NULL;
1057
1058                         /*
1059                          *      Free proxy request pairs.
1060                          */
1061                         pairfree(&request->proxy->vps);
1062                 }
1063
1064                 switch (rcode) {
1065                 default:  /* Don't do anything */
1066                         break;
1067                 case RLM_MODULE_FAIL:
1068                         /* FIXME: debug print stuff */
1069                         request->child_state = REQUEST_DONE;
1070                         return 0;
1071
1072                 case RLM_MODULE_HANDLED:
1073                         /* FIXME: debug print stuff */
1074                         request->child_state = REQUEST_DONE;
1075                         return 0;
1076                 }
1077         }
1078
1079         return 1;
1080 }
1081
1082
1083 /*
1084  *      Do state handling when we proxy a request.
1085  */
1086 static int proxy_request(REQUEST *request)
1087 {
1088         struct timeval when;
1089         char buffer[128];
1090
1091         if (!insert_into_proxy_hash(request)) {
1092                 DEBUG("ERROR: Failed inserting request into proxy hash.");
1093                 return 0;
1094         }
1095
1096         request->proxy_listener->encode(request->proxy_listener, request);
1097
1098         when = request->received;
1099         when.tv_sec += request->root->max_request_time;
1100
1101         gettimeofday(&request->proxy_when, NULL);
1102
1103         request->next_when = request->proxy_when;
1104         request->next_when.tv_sec += request->home_server->response_window;
1105
1106         rad_assert(request->home_server->response_window > 0);
1107
1108         if (timercmp(&when, &request->next_when, <)) {
1109                 request->next_when = when;
1110         }
1111         request->next_callback = no_response_to_proxied_request;
1112
1113         DEBUG2("Proxying request %d to home server %s port %d",
1114                request->number,
1115                inet_ntop(request->proxy->dst_ipaddr.af,
1116                          &request->proxy->dst_ipaddr.ipaddr,
1117                          buffer, sizeof(buffer)),
1118                request->proxy->dst_port);
1119
1120         /*
1121          *      Note that we set proxied BEFORE sending the packet.
1122          *
1123          *      Once we send it, the request is tainted, as
1124          *      another thread may have picked it up.  Don't
1125          *      touch it!
1126          */
1127         request->num_proxied_requests = 1;
1128         request->num_proxied_responses = 0;
1129         request->child_pid = NO_SUCH_CHILD_PID;
1130         request->child_state = REQUEST_PROXIED;
1131         request->proxy_listener->send(request->proxy_listener,
1132                                       request);
1133         return 1;
1134 }
1135
1136 /*
1137  *      Return 1 if we did proxy it, or the proxy attempt failed
1138  *      completely.  Either way, the caller doesn't touch the request
1139  *      any more if we return 1.
1140  */
1141 static int successfully_proxied_request(REQUEST *request)
1142 {
1143         int rcode;
1144         int pre_proxy_type = 0;
1145         VALUE_PAIR *realmpair;
1146         VALUE_PAIR *strippedname;
1147         VALUE_PAIR *vp;
1148         char *realmname;
1149         home_server *home;
1150         REALM *realm = NULL;
1151         home_pool_t *pool;
1152
1153         /*
1154          *      If it was already proxied, do nothing.
1155          *
1156          *      FIXME: This should really be a serious error.
1157          */
1158         if (request->in_proxy_hash) {
1159                 return 0;
1160         }
1161
1162         realmpair = pairfind(request->config_items, PW_PROXY_TO_REALM);
1163         if (!realmpair || (realmpair->length == 0)) {
1164                 return 0;
1165         }
1166
1167         realmname = (char *) realmpair->vp_strvalue;
1168
1169         realm = realm_find(realmname);
1170         if (!realm) {
1171                 DEBUG2("ERROR: Cannot proxy to unknown realm %s", realmname);
1172                 return 0;
1173         }
1174
1175         /*
1176          *      Figure out which pool to use.
1177          */
1178         if (request->packet->code == PW_AUTHENTICATION_REQUEST) {
1179                 pool = realm->auth_pool;
1180
1181         } else if (request->packet->code == PW_ACCOUNTING_REQUEST) {
1182                 pool = realm->acct_pool;
1183
1184         } else {
1185                 rad_panic("Internal sanity check failed");
1186         }
1187
1188         if (!pool) {
1189                 DEBUG2(" WARNING: Cancelling proxy to Realm %s, as the realm is local.",
1190                        realmname);
1191                 return 0;
1192         }
1193
1194         home = home_server_ldb(realmname, pool, request);
1195         if (!home) {
1196                 DEBUG2("ERROR: Failed to find live home server for realm %s",
1197                        realmname);
1198                 return -1;
1199         }
1200         request->home_pool = pool;
1201
1202         /*
1203          *      Remember that we sent the request to a Realm.
1204          */
1205         pairadd(&request->packet->vps,
1206                 pairmake("Realm", realmname, T_OP_EQ));
1207
1208         /*
1209          *      We read the packet from a detail file, AND it came from
1210          *      the server we're about to send it to.  Don't do that.
1211          */
1212         if ((request->packet->code == PW_ACCOUNTING_REQUEST) &&
1213             (request->listener->type == RAD_LISTEN_DETAIL) &&
1214             (home->ipaddr.af == AF_INET) &&
1215             (request->packet->src_ipaddr.af == AF_INET) &&
1216             (home->ipaddr.ipaddr.ip4addr.s_addr == request->packet->src_ipaddr.ipaddr.ip4addr.s_addr)) {
1217                 DEBUG2("    rlm_realm: Packet came from realm %s, proxy cancelled", realmname);
1218                 return 0;
1219         }
1220
1221         /*
1222          *      Allocate the proxy packet, only if it wasn't already
1223          *      allocated by a module.  This check is mainly to support
1224          *      the proxying of EAP-TTLS and EAP-PEAP tunneled requests.
1225          *
1226          *      In those cases, the EAP module creates a "fake"
1227          *      request, and recursively passes it through the
1228          *      authentication stage of the server.  The module then
1229          *      checks if the request was supposed to be proxied, and
1230          *      if so, creates a proxy packet from the TUNNELED request,
1231          *      and not from the EAP request outside of the tunnel.
1232          *
1233          *      The proxy then works like normal, except that the response
1234          *      packet is "eaten" by the EAP module, and encapsulated into
1235          *      an EAP packet.
1236          */
1237         if (!request->proxy) {
1238                 if ((request->proxy = rad_alloc(TRUE)) == NULL) {
1239                         radlog(L_ERR|L_CONS, "no memory");
1240                         exit(1);
1241                 }
1242
1243                 /*
1244                  *      Copy the request, then look up name and
1245                  *      plain-text password in the copy.
1246                  *
1247                  *      Note that the User-Name attribute is the
1248                  *      *original* as sent over by the client.  The
1249                  *      Stripped-User-Name attribute is the one hacked
1250                  *      through the 'hints' file.
1251                  */
1252                 request->proxy->vps =  paircopy(request->packet->vps);
1253         }
1254
1255         /*
1256          *      Strip the name, if told to.
1257          *
1258          *      Doing it here catches the case of proxied tunneled
1259          *      requests.
1260          */
1261         if (realm->striprealm == TRUE &&
1262            (strippedname = pairfind(request->proxy->vps, PW_STRIPPED_USER_NAME)) != NULL) {
1263                 /*
1264                  *      If there's a Stripped-User-Name attribute in
1265                  *      the request, then use THAT as the User-Name
1266                  *      for the proxied request, instead of the
1267                  *      original name.
1268                  *
1269                  *      This is done by making a copy of the
1270                  *      Stripped-User-Name attribute, turning it into
1271                  *      a User-Name attribute, deleting the
1272                  *      Stripped-User-Name and User-Name attributes
1273                  *      from the vps list, and making the new
1274                  *      User-Name the head of the vps list.
1275                  */
1276                 vp = pairfind(request->proxy->vps, PW_USER_NAME);
1277                 if (!vp) {
1278                         vp = radius_paircreate(request, NULL,
1279                                                PW_USER_NAME, PW_TYPE_STRING);
1280                         rad_assert(vp != NULL); /* handled by above function */
1281                         /* Insert at the START of the list */
1282                         vp->next = request->proxy->vps;
1283                         request->proxy->vps = vp;
1284                 }
1285                 memcpy(vp->vp_strvalue, strippedname->vp_strvalue,
1286                        sizeof(vp->vp_strvalue));
1287                 vp->length = strippedname->length;
1288
1289                 /*
1290                  *      Do NOT delete Stripped-User-Name.
1291                  */
1292         }
1293
1294         /*
1295          *      If there is no PW_CHAP_CHALLENGE attribute but
1296          *      there is a PW_CHAP_PASSWORD we need to add it
1297          *      since we can't use the request authenticator
1298          *      anymore - we changed it.
1299          */
1300         if (pairfind(request->proxy->vps, PW_CHAP_PASSWORD) &&
1301             pairfind(request->proxy->vps, PW_CHAP_CHALLENGE) == NULL) {
1302                 vp = radius_paircreate(request, &request->proxy->vps,
1303                                        PW_CHAP_CHALLENGE, PW_TYPE_OCTETS);
1304                 vp->length = AUTH_VECTOR_LEN;
1305                 memcpy(vp->vp_strvalue, request->packet->vector, AUTH_VECTOR_LEN);
1306         }
1307
1308         /*
1309          *      The RFC's say we have to do this, but FreeRADIUS
1310          *      doesn't need it.
1311          */
1312         vp = radius_paircreate(request, &request->proxy->vps,
1313                                PW_PROXY_STATE, PW_TYPE_OCTETS);
1314         snprintf(vp->vp_strvalue, sizeof(vp->vp_strvalue), "%d",
1315                  request->packet->id);
1316         vp->length = strlen(vp->vp_strvalue);
1317
1318         /*
1319          *      Should be done BEFORE inserting into proxy hash, as
1320          *      pre-proxy may use this information, or change it.
1321          */
1322         request->proxy->code = request->packet->code;
1323         request->proxy->dst_ipaddr = home->ipaddr;
1324         request->proxy->dst_port = home->port;
1325         request->home_server = home;
1326
1327         /*
1328          *      Call the pre-proxy routines.
1329          */
1330         vp = pairfind(request->config_items, PW_PRE_PROXY_TYPE);
1331         if (vp) {
1332                 DEBUG2("  Found Pre-Proxy-Type %s", vp->vp_strvalue);
1333                 pre_proxy_type = vp->vp_integer;
1334         }
1335
1336         rad_assert(request->home_pool != NULL);
1337
1338         if (request->home_pool->virtual_server) {
1339                 const char *old_server = request->server;
1340
1341                 request->server = request->home_pool->virtual_server;
1342                 DEBUG2(" server %s {", request->server);
1343                 rcode = module_pre_proxy(pre_proxy_type, request);
1344                 DEBUG2(" }");
1345                         request->server = old_server;
1346         } else {
1347                 rcode = module_pre_proxy(pre_proxy_type, request);
1348         }
1349         switch (rcode) {
1350         case RLM_MODULE_FAIL:
1351         case RLM_MODULE_INVALID:
1352         case RLM_MODULE_NOTFOUND:
1353         case RLM_MODULE_USERLOCK:
1354         default:
1355                 /* FIXME: debug print failed stuff */
1356                 return -1;
1357
1358         case RLM_MODULE_REJECT:
1359         case RLM_MODULE_HANDLED:
1360                 return 0;
1361
1362         /*
1363          *      Only proxy the packet if the pre-proxy code succeeded.
1364          */
1365         case RLM_MODULE_NOOP:
1366         case RLM_MODULE_OK:
1367         case RLM_MODULE_UPDATED:
1368                 break;
1369         }
1370
1371         /*
1372          *      If it's a fake request, don't send the proxy
1373          *      packet.  The outer tunnel session will take
1374          *      care of doing that.
1375          */
1376         if (request->packet->dst_port == 0) {
1377                 request->home_server = NULL;
1378                 return 1;
1379         }
1380
1381         if (!proxy_request(request)) {
1382                 DEBUG("ERROR: Failed to proxy request %d", request->number);
1383                 return -1;
1384         }
1385
1386         return 1;
1387 }
1388
1389
1390 static void request_post_handler(REQUEST *request)
1391 {
1392         int child_state = -1;
1393         struct timeval when;
1394         VALUE_PAIR *vp;
1395
1396         if ((request->master_state == REQUEST_STOP_PROCESSING) ||
1397             (request->parent &&
1398              (request->parent->master_state == REQUEST_STOP_PROCESSING))) {
1399                 DEBUG2("Request %d was cancelled.", request->number);
1400                 request->child_pid = NO_SUCH_CHILD_PID;
1401                 request->child_state = REQUEST_DONE;
1402                 return;
1403         }
1404
1405         if (request->child_state != REQUEST_RUNNING) {
1406                 rad_panic("Internal sanity check failed");
1407         }
1408
1409         if ((request->reply->code == 0) &&
1410             ((vp = pairfind(request->config_items, PW_AUTH_TYPE)) != NULL) &&
1411             (vp->vp_integer == PW_AUTHTYPE_REJECT)) {
1412                 request->reply->code = PW_AUTHENTICATION_REJECT;
1413         }
1414
1415         if (request->root->proxy_requests &&
1416             !request->in_proxy_hash &&
1417             (request->reply->code == 0) &&
1418             (request->packet->dst_port != 0) &&
1419             (request->packet->code != PW_STATUS_SERVER)) {
1420                 int rcode = successfully_proxied_request(request);
1421
1422                 if (rcode == 1) return;
1423
1424                 /*
1425                  *      Failed proxying it (dead home servers, etc.)
1426                  *      Run it through Post-Proxy-Type = Fail, and
1427                  *      respond to the request.
1428                  *
1429                  *      Note that we're in a child thread here, so we
1430                  *      do NOT re-schedule the request.  Instead, we
1431                  *      do what we would have done, which is run the
1432                  *      pre-handler, a NULL request handler, and then
1433                  *      the post handler.
1434                  */
1435                 if ((rcode < 0) && setup_post_proxy_fail(request)) {
1436                         request_pre_handler(request);
1437                 }
1438
1439                 /*
1440                  *      Else we weren't supposed to proxy it.
1441                  */
1442         }
1443
1444         /*
1445          *      Fake requests don't get encoded or signed.  The caller
1446          *      also requires the reply VP's, so we don't free them
1447          *      here!
1448          */
1449         if (request->packet->dst_port == 0) {
1450                 /* FIXME: DEBUG going to the next request */
1451                 request->child_pid = NO_SUCH_CHILD_PID;
1452                 request->child_state = REQUEST_DONE;
1453                 return;
1454         }
1455
1456         /*
1457          *      Copy Proxy-State from the request to the reply.
1458          */
1459         vp = paircopy2(request->packet->vps, PW_PROXY_STATE);
1460         if (vp) pairadd(&request->reply->vps, vp);
1461
1462         /*
1463          *      Access-Requests get delayed or cached.
1464          */
1465         switch (request->packet->code) {
1466         case PW_AUTHENTICATION_REQUEST:
1467                 gettimeofday(&request->next_when, NULL);
1468
1469                 if (request->reply->code == 0) {
1470                         /*
1471                          *      Check if the lack of response is intentional.
1472                          */
1473                         vp = pairfind(request->config_items,
1474                                       PW_RESPONSE_PACKET_TYPE);
1475                         if (!vp || (vp->vp_integer != 256)) {
1476                                 DEBUG2("There was no response configured: rejecting request %d",
1477                                        request->number);
1478                                 request->reply->code = PW_AUTHENTICATION_REJECT;
1479                         } else {
1480                                 DEBUG2("Not responding to request %d",
1481                                        request->number);
1482                         }
1483                 }
1484
1485                 /*
1486                  *      Run rejected packets through
1487                  *
1488                  *      Post-Auth-Type = Reject
1489                  */
1490                 if (request->reply->code == PW_AUTHENTICATION_REJECT) {
1491                         pairdelete(&request->config_items, PW_POST_AUTH_TYPE);
1492                         vp = radius_pairmake(request, &request->config_items,
1493                                              "Post-Auth-Type", "Reject",
1494                                              T_OP_SET);
1495                         if (vp) rad_postauth(request);
1496
1497                         /*
1498                          *      If configured, delay Access-Reject packets.
1499                          *
1500                          *      If request->root->reject_delay = 0, we discover
1501                          *      that we have to send the packet now.
1502                          */
1503                         when = request->received;
1504                         when.tv_sec += request->root->reject_delay;
1505
1506                         if (timercmp(&when, &request->next_when, >)) {
1507                                 DEBUG2("Delaying reject of request %d for %d seconds",
1508                                        request->number,
1509                                        request->root->reject_delay);
1510                                 request->next_when = when;
1511                                 request->next_callback = reject_delay;
1512                                 request->child_pid = NO_SUCH_CHILD_PID;
1513                                 request->child_state = REQUEST_REJECT_DELAY;
1514                                 return;
1515                         }
1516                 }
1517
1518                 request->next_when.tv_sec += request->root->cleanup_delay;
1519                 request->next_callback = cleanup_delay;
1520                 child_state = REQUEST_CLEANUP_DELAY;
1521                 break;
1522
1523         case PW_ACCOUNTING_REQUEST:
1524                 request->next_callback = NULL; /* just to be safe */
1525                 child_state = REQUEST_DONE;
1526                 break;
1527
1528                 /*
1529                  *      FIXME: Status-Server should probably not be
1530                  *      handled here...
1531                  */
1532         case PW_STATUS_SERVER:
1533                 request->next_callback = NULL;
1534                 child_state = REQUEST_DONE;
1535                 break;
1536
1537         default:
1538                 rad_panic("Unknown packet type");
1539                 break;
1540         }
1541
1542         /*
1543          *      Suppress "no reply" packets here, unless we're reading
1544          *      from the "detail" file.  In that case, we've got to
1545          *      tell the detail file handler that the request is dead,
1546          *      and it should re-send it.
1547          *      If configured, encode, sign, and send.
1548          */
1549         if ((request->reply->code != 0) ||
1550             (request->listener->type == RAD_LISTEN_DETAIL)) {
1551                 request->listener->send(request->listener, request);
1552         }
1553
1554         /*
1555          *      Clean up.  These are no longer needed.
1556          */
1557         pairfree(&request->config_items);
1558
1559         pairfree(&request->packet->vps);
1560         request->username = NULL;
1561         request->password = NULL;
1562
1563         pairfree(&request->reply->vps);
1564
1565         if (request->proxy) {
1566                 pairfree(&request->proxy->vps);
1567
1568                 if (request->proxy_reply) {
1569                         pairfree(&request->proxy_reply->vps);
1570                 }
1571
1572                 /*
1573                  *      We're not tracking responses from the home
1574                  *      server, we can therefore free this memory in
1575                  *      the child thread.
1576                  */
1577                 if (!request->in_proxy_hash) {
1578                         rad_free(&request->proxy);
1579                         rad_free(&request->proxy_reply);
1580                         request->home_server = NULL;
1581                 }
1582         }
1583
1584         DEBUG2("Finished request %d.", request->number);
1585
1586         request->child_state = child_state;
1587 }
1588
1589
1590 static void received_retransmit(REQUEST *request, const RADCLIENT *client)
1591 {
1592         char buffer[128];
1593
1594         RAD_SNMP_TYPE_INC(request->listener, total_dup_requests);
1595         RAD_SNMP_CLIENT_INC(request->listener, client, dup_requests);
1596
1597         switch (request->child_state) {
1598         case REQUEST_QUEUED:
1599         case REQUEST_RUNNING:
1600         discard:
1601                 radlog(L_ERR, "Discarding duplicate request from "
1602                        "client %s port %d - ID: %d due to unfinished request %d",
1603                        client->shortname,
1604                        request->packet->src_port,request->packet->id,
1605                        request->number);
1606                 break;
1607
1608         case REQUEST_PROXIED:
1609                 /*
1610                  *      We're not supposed to have duplicate
1611                  *      accounting packets.  The other states handle
1612                  *      duplicates fine (discard, or send duplicate
1613                  *      reply).  But we do NOT want to retransmit an
1614                  *      accounting request here, because that would
1615                  *      involve updating the Acct-Delay-Time, and
1616                  *      therefore changing the packet Id, etc.
1617                  *
1618                  *      Instead, we just discard the packet.  We may
1619                  *      eventually respond, or the client will send a
1620                  *      new accounting packet.
1621                  */
1622                 if (request->packet->code == PW_ACCOUNTING_REQUEST) {
1623                         goto discard;
1624                 }
1625
1626                 check_for_zombie_home_server(request);
1627
1628                 /*
1629                  *      If we've just discovered that the home server is
1630                  *      dead, send the packet to another one.
1631                  */
1632                 if ((request->packet->dst_port != 0) &&
1633                     (request->home_server->state == HOME_STATE_IS_DEAD)) {
1634                         home_server *home;
1635
1636                         remove_from_proxy_hash(request);
1637
1638                         home = home_server_ldb(NULL, request->home_pool, request);
1639                         if (!home) {
1640                                 DEBUG2("Failed to find live home server for request %d", request->number);
1641                         no_home_servers:
1642                                 /*
1643                                  *      Do post-request processing,
1644                                  *      and any insertion of necessary
1645                                  *      events.
1646                                  */
1647                                 post_proxy_fail_handler(request);
1648                                 return;
1649                         }
1650
1651                         request->proxy->code = request->packet->code;
1652                         request->proxy->dst_ipaddr = home->ipaddr;
1653                         request->proxy->dst_port = home->port;
1654                         request->home_server = home;
1655
1656                         /*
1657                          *      Free the old packet, to force re-encoding
1658                          */
1659                         free(request->proxy->data);
1660                         request->proxy->data = NULL;
1661                         request->proxy->data_len = 0;
1662
1663                         /*
1664                          *      Try to proxy the request.
1665                          */
1666                         if (!proxy_request(request)) {
1667                                 DEBUG("ERROR: Failed to re-proxy request %d", request->number);
1668                                 goto no_home_servers;
1669                         }
1670
1671                         /*
1672                          *      This code executes in the main server
1673                          *      thread, so there's no need for locking.
1674                          */
1675                         rad_assert(request->next_callback != NULL);
1676                         INSERT_EVENT(request->next_callback, request);
1677                         request->next_callback = NULL;
1678                         return;
1679                 } /* else the home server is still alive */
1680
1681                 DEBUG2("Sending duplicate proxied request to home server %s port %d - ID: %d",
1682                        inet_ntop(request->proxy->dst_ipaddr.af,
1683                                  &request->proxy->dst_ipaddr.ipaddr,
1684                                  buffer, sizeof(buffer)),
1685                        request->proxy->dst_port,
1686                        request->proxy->id);
1687                 request->num_proxied_requests++;
1688                 request->proxy_listener->send(request->proxy_listener,
1689                                               request);
1690                 break;
1691
1692         case REQUEST_REJECT_DELAY:
1693                 DEBUG2("Waiting to send Access-Reject "
1694                        "to client %s port %d - ID: %d",
1695                        client->shortname,
1696                        request->packet->src_port, request->packet->id);
1697                 break;
1698
1699         case REQUEST_CLEANUP_DELAY:
1700         case REQUEST_DONE:
1701                 DEBUG2("Sending duplicate reply "
1702                        "to client %s port %d - ID: %d",
1703                        client->shortname,
1704                        request->packet->src_port, request->packet->id);
1705                 request->listener->send(request->listener, request);
1706                 break;
1707         }
1708 }
1709
1710
1711 static void received_conflicting_request(REQUEST *request,
1712                                          const RADCLIENT *client)
1713 {
1714         radlog(L_ERR, "Received conflicting packet from "
1715                "client %s port %d - ID: %d due to unfinished request %d.  Giving up on old request.",
1716                client->shortname,
1717                request->packet->src_port, request->packet->id,
1718                request->number);
1719
1720         /*
1721          *      Nuke it from the request hash, so we can receive new
1722          *      packets.
1723          */
1724         remove_from_request_hash(request);
1725
1726         switch (request->child_state) {
1727                 /*
1728                  *      It's queued or running.  Tell it to stop, and
1729                  *      wait for it to do so.
1730                  */
1731         case REQUEST_QUEUED:
1732         case REQUEST_RUNNING:
1733                 request->master_state = REQUEST_STOP_PROCESSING;
1734                 request->delay += request->delay >> 1;
1735
1736                 tv_add(&request->when, request->delay);
1737
1738                 INSERT_EVENT(wait_for_child_to_die, request);
1739                 return;
1740
1741                 /*
1742                  *      It's in some other state, and therefore also
1743                  *      in the event queue.  At some point, the
1744                  *      child will notice, and we can then delete it.
1745                  */
1746         default:
1747                 rad_assert(request->ev != NULL);
1748                 break;
1749         }
1750 }
1751
1752
1753 static int can_handle_new_request(RADIUS_PACKET *packet,
1754                                   RADCLIENT *client,
1755                                   struct main_config_t *root)
1756 {
1757         /*
1758          *      Count the total number of requests, to see if
1759          *      there are too many.  If so, return with an
1760          *      error.
1761          */
1762         if (root->max_requests) {
1763                 int request_count = fr_packet_list_num_elements(pl);
1764
1765                 /*
1766                  *      This is a new request.  Let's see if
1767                  *      it makes us go over our configured
1768                  *      bounds.
1769                  */
1770                 if (request_count > root->max_requests) {
1771                         radlog(L_ERR, "Dropping request (%d is too many): "
1772                                "from client %s port %d - ID: %d", request_count,
1773                                client->shortname,
1774                                packet->src_port, packet->id);
1775                         radlog(L_INFO, "WARNING: Please check the configuration file.\n"
1776                                "\tThe value for 'max_requests' is probably set too low.\n");
1777                         return 0;
1778                 } /* else there were a small number of requests */
1779         } /* else there was no configured limit for requests */
1780
1781         /*
1782          *      FIXME: Add per-client checks.  If one client is sending
1783          *      too many packets, start discarding them.
1784          *
1785          *      We increment the counters here, and decrement them
1786          *      when the response is sent... somewhere in this file.
1787          */
1788
1789         /*
1790          *      FUTURE: Add checks for system load.  If the system is
1791          *      busy, start dropping requests...
1792          *
1793          *      We can probably keep some statistics ourselves...  if
1794          *      there are more requests coming in than we can handle,
1795          *      start dropping some.
1796          */
1797
1798         return 1;
1799 }
1800
1801
1802 int received_request(rad_listen_t *listener,
1803                      RADIUS_PACKET *packet, REQUEST **prequest,
1804                      RADCLIENT *client)
1805 {
1806         RADIUS_PACKET **packet_p;
1807         REQUEST *request = NULL;
1808         struct main_config_t *root = &mainconfig;
1809
1810         packet_p = fr_packet_list_find(pl, packet);
1811         if (packet_p) {
1812                 request = fr_packet2myptr(REQUEST, packet, packet_p);
1813                 rad_assert(request->in_request_hash);
1814
1815                 if ((request->packet->data_len == packet->data_len) &&
1816                     (memcmp(request->packet->vector, packet->vector,
1817                             sizeof(packet->vector)) == 0)) {
1818                         received_retransmit(request, client);
1819                         return 0;
1820                 }
1821
1822                 /*
1823                  *      The new request is different from the old one,
1824                  *      but maybe the old is finished.  If so, delete
1825                  *      the old one.
1826                  */
1827                 switch (request->child_state) {
1828                         struct timeval when;
1829
1830                 default:
1831                         gettimeofday(&when, NULL);
1832                         when.tv_sec -= 1;
1833
1834                         /*
1835                          *      If the cached request was received
1836                          *      within the last second, then we
1837                          *      discard the NEW request instead of the
1838                          *      old one.  This will happen ONLY when
1839                          *      the client is severely broken, and is
1840                          *      sending conflicting packets very
1841                          *      quickly.
1842                          */
1843                         if (timercmp(&when, &request->received, <)) {
1844                                 radlog(L_ERR, "Discarding conflicting packet from "
1845                                        "client %s port %d - ID: %d due to recent request %d.",
1846                                        client->shortname,
1847                                        packet->src_port, packet->id,
1848                                        request->number);
1849                                 return 0;
1850                         }
1851
1852                         received_conflicting_request(request, client);
1853                         request = NULL;
1854                         break;
1855
1856                 case REQUEST_REJECT_DELAY:
1857                 case REQUEST_CLEANUP_DELAY:
1858                         request->child_state = REQUEST_DONE;
1859                 case REQUEST_DONE:
1860                         cleanup_delay(request);
1861                         request = NULL;
1862                         break;
1863                 }
1864         }
1865
1866         /*
1867          *      We may want to quench the new request.
1868          */
1869         if ((listener->type != RAD_LISTEN_DETAIL) &&
1870             !can_handle_new_request(packet, client, root)) {
1871                 return 0;
1872         }
1873
1874         /*
1875          *      Create and initialize the new request.
1876          */
1877         request = request_alloc(); /* never fails */
1878
1879         if ((request->reply = rad_alloc(0)) == NULL) {
1880                 radlog(L_ERR, "No memory");
1881                 exit(1);
1882         }
1883
1884         request->listener = listener;
1885         request->client = client;
1886         request->packet = packet;
1887         request->packet->timestamp = request->timestamp;
1888         request->number = request_num_counter++;
1889         request->priority = listener->type;
1890
1891         /*
1892          *      Set virtual server identity
1893          */
1894         if (client->server) {
1895                 request->server = client->server;
1896         } else if (listener->server) {
1897                 request->server = listener->server;
1898         } else {
1899                 request->server = NULL;
1900         }
1901
1902         /*
1903          *      Remember the request in the list.
1904          */
1905         if (!fr_packet_list_insert(pl, &request->packet)) {
1906                 radlog(L_ERR, "Failed to insert request %d in the list of live requests: discarding", request->number);
1907                 request_free(&request);
1908                 return 0;
1909         }
1910
1911         request->in_request_hash = TRUE;
1912         request->root = root;
1913         root->refcount++;
1914
1915         /*
1916          *      The request passes many of our sanity checks.
1917          *      From here on in, if anything goes wrong, we
1918          *      send a reject message, instead of dropping the
1919          *      packet.
1920          */
1921
1922         /*
1923          *      Build the reply template from the request.
1924          */
1925
1926         request->reply->sockfd = request->packet->sockfd;
1927         request->reply->dst_ipaddr = request->packet->src_ipaddr;
1928         request->reply->src_ipaddr = request->packet->dst_ipaddr;
1929         request->reply->dst_port = request->packet->src_port;
1930         request->reply->src_port = request->packet->dst_port;
1931         request->reply->id = request->packet->id;
1932         request->reply->code = 0; /* UNKNOWN code */
1933         memcpy(request->reply->vector, request->packet->vector,
1934                sizeof(request->reply->vector));
1935         request->reply->vps = NULL;
1936         request->reply->data = NULL;
1937         request->reply->data_len = 0;
1938
1939         request->master_state = REQUEST_ACTIVE;
1940         request->child_state = REQUEST_QUEUED;
1941         request->next_callback = NULL;
1942
1943         gettimeofday(&request->received, NULL);
1944         request->timestamp = request->received.tv_sec;
1945         request->when = request->received;
1946
1947         request->delay = USEC;
1948
1949         tv_add(&request->when, request->delay);
1950
1951         INSERT_EVENT(wait_a_bit, request);
1952
1953         *prequest = request;
1954         return 1;
1955 }
1956
1957
1958 REQUEST *received_proxy_response(RADIUS_PACKET *packet)
1959 {
1960         char            buffer[128];
1961         home_server     *home;
1962         REQUEST         *request;
1963
1964         if (!home_server_find(&packet->src_ipaddr, packet->src_port)) {
1965                 radlog(L_ERR, "Ignoring request from unknown home server %s port %d",
1966                        inet_ntop(packet->src_ipaddr.af,
1967                                  &packet->src_ipaddr.ipaddr,
1968                                  buffer, sizeof(buffer)),
1969                                packet->src_port);
1970                 rad_free(&packet);
1971                 return NULL;
1972         }
1973
1974         /*
1975          *      Also removes from the proxy hash if responses == requests
1976          */
1977         request = lookup_in_proxy_hash(packet);
1978
1979         if (!request) {
1980                 radlog(L_PROXY, "No outstanding request was found for proxy reply from home server %s port %d - ID %d",
1981                        inet_ntop(packet->src_ipaddr.af,
1982                                  &packet->src_ipaddr.ipaddr,
1983                                  buffer, sizeof(buffer)),
1984                        packet->src_port, packet->id);
1985                 rad_free(&packet);
1986                 return NULL;
1987         }
1988
1989         home = request->home_server;
1990
1991         gettimeofday(&now, NULL);
1992         home->state = HOME_STATE_ALIVE;
1993
1994         if (request->reply && request->reply->code != 0) {
1995                 DEBUG2("We already replied to this request.  Discarding response from home server.");
1996                 rad_free(&packet);
1997                 return NULL;
1998         }
1999
2000         /*
2001          *      We had previously received a reply, so we don't need
2002          *      to do anything here.
2003          */
2004         if (request->proxy_reply) {
2005                 if (memcmp(request->proxy_reply->vector,
2006                            packet->vector,
2007                            sizeof(request->proxy_reply->vector)) == 0) {
2008                         DEBUG2("Discarding duplicate reply from home server %s port %d  - ID: %d for request %d",
2009                                inet_ntop(packet->src_ipaddr.af,
2010                                          &packet->src_ipaddr.ipaddr,
2011                                          buffer, sizeof(buffer)),
2012                                packet->src_port, packet->id,
2013                                request->number);
2014                 } else {
2015                         /*
2016                          *      ? The home server gave us a new proxy
2017                          *      reply, which doesn't match the old
2018                          *      one.  Delete it.
2019                          */
2020                         DEBUG2("Ignoring conflicting proxy reply");
2021                 }
2022
2023                 /* assert that there's an event queued for request? */
2024                 rad_free(&packet);
2025                 return NULL;
2026         }
2027
2028         switch (request->child_state) {
2029         case REQUEST_QUEUED:
2030         case REQUEST_RUNNING:
2031                 rad_panic("Internal sanity check failed for child state");
2032                 break;
2033
2034         case REQUEST_REJECT_DELAY:
2035         case REQUEST_CLEANUP_DELAY:
2036         case REQUEST_DONE:
2037                 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'",
2038                        inet_ntop(packet->src_ipaddr.af,
2039                                  &packet->src_ipaddr.ipaddr,
2040                                  buffer, sizeof(buffer)),
2041                        packet->src_port, packet->id,
2042                        request->number);
2043                 /* assert that there's an event queued for request? */
2044                 rad_free(&packet);
2045                 return NULL;
2046
2047         case REQUEST_PROXIED:
2048                 break;
2049         }
2050
2051         request->proxy_reply = packet;
2052
2053 #if 0
2054         /*
2055          *      Perform RTT calculations, as per RFC 2988 (for TCP).
2056          *      Note that we do so only if we sent one request, and
2057          *      received one response.  If we sent two requests, we
2058          *      have no idea if the response is for the first, or for
2059          *      the second request/
2060          */
2061         if (request->num_proxied_requests == 1) {
2062                 int rtt;
2063                 home_server *home = request->home_server;
2064
2065                 rtt = now.tv_sec - request->proxy_when.tv_sec;
2066                 rtt *= USEC;
2067                 rtt += now.tv_usec;
2068                 rtt -= request->proxy_when.tv_usec;
2069
2070                 if (!home->has_rtt) {
2071                         home->has_rtt = TRUE;
2072
2073                         home->srtt = rtt;
2074                         home->rttvar = rtt / 2;
2075
2076                 } else {
2077                         home->rttvar -= home->rttvar >> 2;
2078                         home->rttvar += (home->srtt - rtt);
2079                         home->srtt -= home->srtt >> 3;
2080                         home->srtt += rtt >> 3;
2081                 }
2082
2083                 home->rto = home->srtt;
2084                 if (home->rttvar > (USEC / 4)) {
2085                         home->rto += home->rttvar * 4;
2086                 } else {
2087                         home->rto += USEC;
2088                 }
2089         }
2090 #endif
2091
2092         /*
2093          *      There's no incoming request, so it's a proxied packet
2094          *      we originated.
2095          */
2096         if (!request->packet) {
2097                 received_response_to_ping(request);
2098                 return NULL;
2099         }
2100
2101         request->child_state = REQUEST_QUEUED;
2102         request->when = now;
2103         request->delay = USEC;
2104         request->priority = RAD_LISTEN_PROXY;
2105         tv_add(&request->when, request->delay);
2106
2107         /*
2108          *      Wait a bit will take care of max_request_time
2109          */
2110         INSERT_EVENT(wait_a_bit, request);
2111
2112         return request;
2113 }
2114
2115
2116 static void event_detail_timer(void *ctx)
2117 {
2118         rad_listen_t *listener = ctx;
2119         RAD_REQUEST_FUNP fun;
2120         REQUEST *request;
2121
2122         if (listener->recv(listener, &fun, &request)) {
2123                 if (!thread_pool_addrequest(request, fun)) {
2124                         request->child_state = REQUEST_DONE;
2125                 }
2126         }
2127 }
2128
2129 static void handle_signal_self(int flag)
2130 {
2131         if ((flag & (RADIUS_SIGNAL_SELF_EXIT | RADIUS_SIGNAL_SELF_TERM)) != 0) {
2132                 if ((flag & RADIUS_SIGNAL_SELF_EXIT) != 0) {
2133                         fr_event_loop_exit(el, 1);
2134                 } else {
2135                         fr_event_loop_exit(el, 2);
2136                 }
2137
2138                 return;
2139         } /* else exit/term flags weren't set */
2140
2141         /*
2142          *      Tell the even loop to stop processing.
2143          */
2144         if ((flag & RADIUS_SIGNAL_SELF_HUP) != 0) {
2145                 time_t when;
2146                 static time_t last_hup = 0;
2147
2148                 DEBUG("Received HUP signal.");
2149
2150                 when = time(NULL);
2151                 if ((int) (when - last_hup) < 5) {
2152                         radlog(L_INFO, "Ignoring HUP (less than 5s since last one)");
2153                         return;
2154                 }
2155                 last_hup = when;
2156
2157                 fr_event_loop_exit(el, 0x80);
2158         }
2159
2160         if ((flag & RADIUS_SIGNAL_SELF_DETAIL) != 0) {
2161                 rad_listen_t *this;
2162
2163                 for (this = mainconfig.listen;
2164                      this != NULL;
2165                      this = this->next) {
2166                         int delay;
2167                         struct timeval when;
2168
2169                         if (this->type != RAD_LISTEN_DETAIL) continue;
2170
2171                         delay = detail_delay(this);
2172                         if (!delay) continue;
2173
2174                         fr_event_now(el, &now);
2175                         when = now;
2176                         tv_add(&when, delay);
2177
2178                         if (delay > 100000) {
2179                                 DEBUG2("Delaying next detail event for %d.%01u seconds.",
2180                                        delay / USEC, (delay % USEC) / 100000);
2181                         }
2182
2183                         if (!fr_event_insert(el, event_detail_timer, this,
2184                                              &when, NULL)) {
2185                                 radlog(L_ERR, "Failed remembering timer");
2186                                 exit(1);
2187                         }
2188                 }
2189         }
2190
2191         if ((flag & RADIUS_SIGNAL_SELF_NEW_FD) != 0) {
2192                 rad_listen_t *this;
2193
2194                 for (this = mainconfig.listen;
2195                      this != NULL;
2196                      this = this->next) {
2197                         if (this->type != RAD_LISTEN_PROXY) continue;
2198
2199                         if (!fr_event_fd_insert(el, 0, this->fd,
2200                                                 event_socket_handler, this)) {
2201                                 radlog(L_ERR, "Failed remembering handle for proxy socket!");
2202                                 exit(1);
2203                         }
2204                 }
2205         }
2206 }
2207
2208 #ifdef __MINGW32__
2209 void radius_signal_self(int flag)
2210 {
2211         handle_signal_self(flag);
2212 }
2213 #else
2214 /*
2215  *      Inform ourselves that we received a signal.
2216  */
2217 void radius_signal_self(int flag)
2218 {
2219         ssize_t rcode;
2220         uint8_t buffer[16];
2221
2222         /*
2223          *      The read MUST be non-blocking for this to work.
2224          */
2225         rcode = read(self_pipe[0], buffer, sizeof(buffer));
2226         if (rcode > 0) {
2227                 ssize_t i;
2228
2229                 for (i = 0; i < rcode; i++) {
2230                         buffer[0] |= buffer[i];
2231                 }
2232         } else {
2233                 buffer[0] = 0;
2234         }
2235
2236         buffer[0] |= flag;
2237
2238         write(self_pipe[1], buffer, 1);
2239 }
2240
2241
2242 static void event_signal_handler(UNUSED fr_event_list_t *xel,
2243                                  UNUSED int fd, UNUSED void *ctx)
2244 {
2245         ssize_t i, rcode;
2246         uint8_t buffer[32];
2247
2248         rcode = read(self_pipe[0], buffer, sizeof(buffer));
2249         if (rcode <= 0) return;
2250
2251         /*
2252          *      Merge pending signals.
2253          */
2254         for (i = 0; i < rcode; i++) {
2255                 buffer[0] |= buffer[i];
2256         }
2257
2258         handle_signal_self(buffer[0]);
2259 }
2260 #endif
2261
2262
2263 static void event_socket_handler(fr_event_list_t *xel, UNUSED int fd,
2264                                  void *ctx)
2265 {
2266         rad_listen_t *listener = ctx;
2267         RAD_REQUEST_FUNP fun;
2268         REQUEST *request;
2269
2270         rad_assert(xel == el);
2271
2272         xel = xel;
2273
2274         if (listener->fd < 0) rad_panic("Socket was closed on us!");
2275
2276         /*
2277          *      FIXME: Put this somewhere else, where it isn't called
2278          *      all of the time...
2279          */
2280 #if !defined(HAVE_PTHREAD_H) && defined(WNOHANG)
2281         /*
2282          *      If there are no child threads, then there may
2283          *      be child processes.  In that case, wait for
2284          *      their exit status, and throw that exit status
2285          *      away.  This helps get rid of zxombie children.
2286          */
2287         while (waitpid(-1, &argval, WNOHANG) > 0) {
2288                 /* do nothing */
2289         }
2290 #endif
2291
2292         if (!listener->recv(listener, &fun, &request)) return;
2293
2294         if (!thread_pool_addrequest(request, fun)) {
2295                 request->child_state = REQUEST_DONE;
2296         }
2297 }
2298
2299
2300 /*
2301  *      This function is called periodically to see if any FD's are
2302  *      available for reading.
2303  */
2304 static void event_poll_fds(UNUSED void *ctx)
2305 {
2306         int rcode;
2307         RAD_REQUEST_FUNP fun;
2308         REQUEST *request;
2309         rad_listen_t *this;
2310         struct timeval when;
2311
2312         fr_event_now(el, &now);
2313         when = now;
2314         when.tv_sec += 1;
2315
2316         for (this = mainconfig.listen; this != NULL; this = this->next) {
2317                 if (this->fd >= 0) continue;
2318
2319                 /*
2320                  *      Try to read something.
2321                  *
2322                  *      FIXME: This does poll AND receive.
2323                  */
2324                 rcode = this->recv(this, &fun, &request);
2325                 if (!rcode) continue;
2326
2327                 rad_assert(fun != NULL);
2328                 rad_assert(request != NULL);
2329
2330                 if (!thread_pool_addrequest(request, fun)) {
2331                         request->child_state = REQUEST_DONE;
2332                 }
2333
2334                 /*
2335                  *      We have an FD.  Start watching it.
2336                  */
2337                 if (this->fd >= 0) {
2338                         /*
2339                          *      ... unless it's a detail file.  In
2340                          *      that case, we rely on the signal to
2341                          *      self to know when to continue
2342                          *      processing the detail file.
2343                          */
2344                         if (this->type == RAD_LISTEN_DETAIL) continue;
2345
2346                         /*
2347                          *      FIXME: this should be SNMP handler,
2348                          *      and we should do SOMETHING when the
2349                          *      fd is closed!
2350                          */
2351                         if (!fr_event_fd_insert(el, 0, this->fd,
2352                                                 event_socket_handler, this)) {
2353                                 char buffer[256];
2354
2355                                 this->print(this, buffer, sizeof(buffer));
2356                                 rad_panic("Failed creating handler for snmp");
2357                         }
2358                 }
2359         }
2360
2361         /*
2362          *      Reset the poll.
2363          */
2364         if (!fr_event_insert(el, event_poll_fds, NULL,
2365                              &when, NULL)) {
2366                 radlog(L_ERR, "Failed creating handler");
2367                 exit(1);
2368         }
2369 }
2370
2371
2372 static void event_status(struct timeval *wake)
2373 {
2374         if (debug_flag == 0) {
2375                 if (just_started) {
2376                         radlog(L_INFO, "Ready to process requests.");
2377                         just_started = FALSE;
2378                 }
2379                 return;
2380         }
2381
2382         if (!wake) {
2383                 DEBUG("Ready to process requests.");
2384
2385         } else if ((wake->tv_sec != 0) ||
2386                    (wake->tv_usec >= 100000)) {
2387                 DEBUG("Waking up in %d.%01u seconds.",
2388                       (int) wake->tv_sec, (unsigned int) wake->tv_usec / 100000);
2389         }
2390 }
2391
2392
2393 /*
2394  *      Externally-visibly functions.
2395  */
2396 int radius_event_init(CONF_SECTION *cs, int spawn_flag)
2397 {
2398         int i;
2399         int has_snmp_listener = FALSE;
2400         rad_listen_t *this, *head = NULL;
2401
2402         if (el) return 0;
2403
2404         time(&start_time);
2405
2406         el = fr_event_list_create(event_status);
2407         if (!el) return 0;
2408
2409         pl = fr_packet_list_create(0);
2410         if (!el) return 0;
2411
2412         request_num_counter = 0;
2413
2414         /*
2415          *      Move all of the thread calls to this file?
2416          *
2417          *      It may be best for the mutexes to be in this file...
2418          */
2419         have_children = spawn_flag;
2420
2421         if (mainconfig.proxy_requests) {
2422                 /*
2423                  *      Create the tree for managing proxied requests and
2424                  *      responses.
2425                  */
2426                 proxy_list = fr_packet_list_create(1);
2427                 if (!proxy_list) return 0;
2428
2429 #ifdef HAVE_PTHREAD_H
2430                 if (pthread_mutex_init(&proxy_mutex, NULL) != 0) {
2431                         radlog(L_ERR, "FATAL: Failed to initialize proxy mutex: %s",
2432                                strerror(errno));
2433                         exit(1);
2434                 }
2435 #endif
2436         }
2437
2438 #ifdef HAVE_PTHREAD_H
2439         if (thread_pool_init(cs, spawn_flag) < 0) {
2440                 exit(1);
2441         }
2442 #endif
2443
2444         if (check_config) {
2445                 DEBUG2("%s: #### Skipping IP addresses and Ports ####",
2446                        mainconfig.name);
2447                 return 1;
2448         }
2449
2450 #ifndef __MINGW32__
2451         /*
2452          *      Child threads need a pipe to signal us, as do the
2453          *      signal handlers.
2454          */
2455         if (pipe(self_pipe) < 0) {
2456                 radlog(L_ERR, "radiusd: Error opening internal pipe: %s",
2457                        strerror(errno));
2458                 exit(1);
2459         }
2460         if (fcntl(self_pipe[0], F_SETFL, O_NONBLOCK | FD_CLOEXEC) < 0) {
2461                 radlog(L_ERR, "radiusd: Error setting internal flags: %s",
2462                        strerror(errno));
2463                 exit(1);
2464         }
2465         if (fcntl(self_pipe[1], F_SETFL, O_NONBLOCK | FD_CLOEXEC) < 0) {
2466                 radlog(L_ERR, "radiusd: Error setting internal flags: %s",
2467                        strerror(errno));
2468                 exit(1);
2469         }
2470
2471         if (!fr_event_fd_insert(el, 0, self_pipe[0],
2472                                   event_signal_handler, el)) {
2473                 radlog(L_ERR, "Failed creating handler for signals");
2474                 exit(1);
2475         }
2476 #endif
2477
2478         /*
2479          *      Mark the proxy Fd's as unused.
2480          */
2481         for (i = 0; i < 32; i++) proxy_fds[i] = -1;
2482
2483         DEBUG2("%s: #### Opening IP addresses and Ports ####",
2484                mainconfig.name);
2485
2486         if (listen_init(cs, &head) < 0) {
2487                 _exit(1);
2488         }
2489
2490         /*
2491          *      Add all of the sockets to the event loop.
2492          */
2493         for (this = head;
2494              this != NULL;
2495              this = this->next) {
2496                 char buffer[256];
2497
2498                 this->print(this, buffer, sizeof(buffer));
2499
2500                 switch (this->type) {
2501                 case RAD_LISTEN_DETAIL:
2502                         DEBUG("Listening on %s", buffer);
2503                         has_detail_listener = TRUE;
2504                         break;
2505
2506                 case RAD_LISTEN_SNMP:
2507                         DEBUG("Listening on SNMP %s", buffer);
2508                         has_snmp_listener = TRUE;
2509                         break;
2510
2511                 case RAD_LISTEN_PROXY:
2512                         rad_assert(proxy_fds[this->fd & 0x1f] == -1);
2513                         rad_assert(proxy_listeners[this->fd & 0x1f] == NULL);
2514
2515                         proxy_fds[this->fd & 0x1f] = this->fd;
2516                         proxy_listeners[this->fd & 0x1f] = this;
2517                         if (!fr_packet_list_socket_add(proxy_list,
2518                                                          this->fd)) {
2519                                 rad_assert(0 == 1);
2520                         }
2521                         /* FALL-THROUGH */
2522
2523                 default:
2524                         DEBUG("Listening on %s", buffer);
2525                         break;
2526                 }
2527
2528                 /*
2529                  *      The file descriptor isn't ready.  Poll for
2530                  *      when it will become ready.  This is for SNMP
2531                  *      and detail file fd's.
2532                  */
2533                 if (this->fd < 0) {
2534                         continue;
2535                 }
2536
2537                 /*
2538                  *      The socket is open.  It MUST be a socket,
2539                  *      as we don't pre-open the detail files (yet).
2540                  *
2541                  *      FIXME: if we DO open the detail files automatically,
2542                  *      then much of this code becomes simpler.
2543                  */
2544                 if (!fr_event_fd_insert(el, 0, this->fd,
2545                                           event_socket_handler, this)) {
2546                         this->print(this, buffer, sizeof(buffer));
2547                         radlog(L_ERR, "Failed creating handler for socket %s",
2548                                buffer);
2549                         exit(1);
2550                 }
2551         }
2552
2553         if (has_detail_listener || has_snmp_listener) {
2554                 struct timeval when;
2555
2556                 gettimeofday(&when, NULL);
2557                 when.tv_sec += 1;
2558
2559                 if (!fr_event_insert(el, event_poll_fds, NULL,
2560                                      &when, NULL)) {
2561                         radlog(L_ERR, "Failed creating handler");
2562                         exit(1);
2563                 }
2564         }
2565
2566         mainconfig.listen = head;
2567
2568         return 1;
2569 }
2570
2571
2572 static int request_hash_cb(UNUSED void *ctx, void *data)
2573 {
2574         REQUEST *request = fr_packet2myptr(REQUEST, packet, data);
2575
2576         rad_assert(request->in_proxy_hash == FALSE);
2577
2578         fr_event_delete(el, &request->ev);
2579         remove_from_request_hash(request);
2580         request_free(&request);
2581
2582         return 0;
2583 }
2584
2585
2586 static int proxy_hash_cb(UNUSED void *ctx, void *data)
2587 {
2588         REQUEST *request = fr_packet2myptr(REQUEST, proxy, data);
2589
2590         fr_packet_list_yank(proxy_list, request->proxy);
2591         request->in_proxy_hash = FALSE;
2592
2593         if (!request->in_request_hash) {
2594                 fr_event_delete(el, &request->ev);
2595                 request_free(&request);
2596         }
2597
2598         return 0;
2599 }
2600
2601
2602 void radius_event_free(void)
2603 {
2604         /*
2605          *      FIXME: Stop all threads, or at least check that
2606          *      they're all waiting on the semaphore, and the queues
2607          *      are empty.
2608          */
2609
2610         /*
2611          *      There are requests in the proxy hash that aren't
2612          *      referenced from anywhere else.  Remove them first.
2613          */
2614         if (proxy_list) {
2615                 PTHREAD_MUTEX_LOCK(&proxy_mutex);
2616                 fr_packet_list_walk(proxy_list, NULL, proxy_hash_cb);
2617                 PTHREAD_MUTEX_UNLOCK(&proxy_mutex);
2618                 fr_packet_list_free(proxy_list);
2619                 proxy_list = NULL;
2620         }
2621
2622         fr_packet_list_walk(pl, NULL, request_hash_cb);
2623
2624         fr_packet_list_free(pl);
2625         pl = NULL;
2626
2627         fr_event_list_free(el);
2628 }
2629
2630 int radius_event_process(void)
2631 {
2632         if (!el) return 0;
2633
2634         just_started = TRUE;
2635
2636         return fr_event_loop(el);
2637 }
2638
2639 void radius_handle_request(REQUEST *request, RAD_REQUEST_FUNP fun)
2640 {
2641         if (request_pre_handler(request)) {
2642                 rad_assert(fun != NULL);
2643                 rad_assert(request != NULL);
2644
2645                 if (request->server) DEBUG("server %s {",
2646                                              request->server);
2647                 fun(request);
2648
2649                 if (request->server) DEBUG("} # server %s",
2650                                              request->server);
2651
2652                 request_post_handler(request);
2653         }
2654
2655         DEBUG2("Going to the next request");
2656         return;
2657 }