git.sur5r.net Git - openldap/blob - servers/slapd/connection.c

   1 /* $OpenLDAP$ */
   2 /* This work is part of OpenLDAP Software <http://www.openldap.org/>.
   3  *
   4  * Copyright 1998-2005 The OpenLDAP Foundation.
   5  * All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted only as authorized by the OpenLDAP
   9  * Public License.
  10  *
  11  * A copy of this license is available in the file LICENSE in the
  12  * top-level directory of the distribution or, alternatively, at
  13  * <http://www.OpenLDAP.org/license.html>.
  14  */
  15 /* Portions Copyright (c) 1995 Regents of the University of Michigan.
  16  * All rights reserved.
  17  *
  18  * Redistribution and use in source and binary forms are permitted
  19  * provided that this notice is preserved and that due credit is given
  20  * to the University of Michigan at Ann Arbor. The name of the University
  21  * may not be used to endorse or promote products derived from this
  22  * software without specific prior written permission. This software
  23  * is provided ``as is'' without express or implied warranty.
  24  */
  25
  26 #include "portable.h"
  27
  28 #include <stdio.h>
  29 #ifdef HAVE_LIMITS_H
  30 #include <limits.h>
  31 #endif
  32
  33 #include <ac/socket.h>
  34 #include <ac/errno.h>
  35 #include <ac/string.h>
  36 #include <ac/time.h>
  37 #include <ac/unistd.h>
  38
  39 #include "lutil.h"
  40 #include "slap.h"
  41
  42 #ifdef LDAP_SLAPI
  43 #include "slapi/slapi.h"
  44 #endif
  45
  46
  47 #ifdef SLAP_MULTI_CONN_ARRAY
  48 /* for Multiple Connection Arrary (MCA) Support */
  49 static ldap_pvt_thread_mutex_t* connections_mutex;
  50 static Connection **connections = NULL;
  51
  52 /* set to the number of processors (round up to a power of 2) */
  53 #       define NUM_CONNECTION_ARRAY 4
  54
  55 /* partition the array in a modulo manner */
  56 #       define MCA_conn_array_id(fd)            ((int)(fd)%NUM_CONNECTION_ARRAY)
  57 #       define MCA_conn_array_element_id(fd)    ((int)(fd)/NUM_CONNECTION_ARRAY)
  58 #       define MCA_GET_CONNECTION(fd) (&(connections[MCA_conn_array_id(fd)]) \
  59                 [MCA_conn_array_element_id(fd)])
  60 #       define MCA_GET_CONN_MUTEX(fd) (&connections_mutex[MCA_conn_array_id(fd)])
  61
  62 #else
  63 /* protected by connections_mutex */
  64 static ldap_pvt_thread_mutex_t connections_mutex;
  65 static Connection *connections = NULL;
  66
  67 #       define MCA_GET_CONNECTION(fd) (&connections[s])
  68 #       define MCA_GET_CONN_MUTEX(fd) (&connections_mutex)
  69 #endif
  70
  71 static ldap_pvt_thread_mutex_t conn_nextid_mutex;
  72 static unsigned long conn_nextid = 0;
  73
  74 static const char conn_lost_str[] = "connection lost";
  75
  76 /* structure state (protected by connections_mutex) */
  77 #define SLAP_C_UNINITIALIZED    0x00    /* MUST BE ZERO (0) */
  78 #define SLAP_C_UNUSED                   0x01
  79 #define SLAP_C_USED                             0x02
  80
  81 /* connection state (protected by c_mutex ) */
  82 #define SLAP_C_INVALID                  0x00    /* MUST BE ZERO (0) */
  83 #define SLAP_C_INACTIVE                 0x01    /* zero threads */
  84 #define SLAP_C_ACTIVE                   0x02    /* one or more threads */
  85 #define SLAP_C_BINDING                  0x03    /* binding */
  86 #define SLAP_C_CLOSING                  0x04    /* closing */
  87 #define SLAP_C_CLIENT                   0x05    /* outbound client conn */
  88
  89 const char *
  90 connection_state2str( int state )
  91 {
  92         switch( state ) {
  93         case SLAP_C_INVALID:    return "!";
  94         case SLAP_C_INACTIVE:   return "|";
  95         case SLAP_C_ACTIVE:             return "";
  96         case SLAP_C_BINDING:    return "B";
  97         case SLAP_C_CLOSING:    return "C";
  98         case SLAP_C_CLIENT:             return "L";
  99         }
 100
 101         return "?";
 102 }
 103
 104 static Connection* connection_get( ber_socket_t s );
 105
 106 #ifdef SLAP_LIGHTWEIGHT_DISPATCHER
 107 static int connection_input( Connection *c, Operation** op );
 108 #else
 109 static int connection_input( Connection *c );
 110 #endif
 111 static void connection_close( Connection *c );
 112
 113 static int connection_op_activate( Operation *op );
 114 #ifdef SLAP_LIGHTWEIGHT_DISPATCHER
 115 static void connection_op_queue( Operation *op );
 116 #endif
 117 static int connection_resched( Connection *conn );
 118 static void connection_abandon( Connection *conn );
 119 static void connection_destroy( Connection *c );
 120
 121 static ldap_pvt_thread_start_t connection_operation;
 122
 123 /*
 124  * Initialize connection management infrastructure.
 125  */
 126 int connections_init(void)
 127 #ifdef SLAP_MULTI_CONN_ARRAY
 128 {
 129         int i, j;
 130         Connection* conn;
 131
 132         assert( connections == NULL );
 133
 134         if( connections != NULL) {
 135                 Debug( LDAP_DEBUG_ANY, "connections_init: already initialized.\n",
 136                         0, 0, 0 );
 137                 return -1;
 138         }
 139
 140         connections_mutex = (ldap_pvt_thread_mutex_t*) ch_calloc(
 141                 NUM_CONNECTION_ARRAY, sizeof(ldap_pvt_thread_mutex_t) );
 142         if( connections_mutex == NULL ) {
 143                 Debug( LDAP_DEBUG_ANY, "connections_init: "
 144                         "allocation of connection mutex[%d] failed\n", i, 0, 0 );
 145                 return -1;
 146         }
 147
 148         connections = (Connection**) ch_calloc(
 149                 NUM_CONNECTION_ARRAY, sizeof(Connection*));
 150         if( connections == NULL ) {
 151                 Debug( LDAP_DEBUG_ANY, "connections_init: "
 152                         "allocation of connection[%d] failed\n", 0, 0, 0 );
 153                 return -1;
 154         }
 155
 156         for ( i = 0; i < NUM_CONNECTION_ARRAY; i++ ) {
 157                 ldap_pvt_thread_mutex_init( connections_mutex+i );
 158                 connections[i] = (Connection*) ch_calloc(
 159                         dtblsize/NUM_CONNECTION_ARRAY, sizeof(Connection) );
 160                 if( connections[i] == NULL ) {
 161                         Debug( LDAP_DEBUG_ANY, "connections_init: "
 162                                 "allocation (%d*%ld) of connection array[%d] failed\n",
 163                                 dtblsize, (long) sizeof(Connection), i );
 164                         return -1;
 165                 }
 166         }
 167
 168         /* should check return of every call */
 169         ldap_pvt_thread_mutex_init( &conn_nextid_mutex );
 170
 171         assert( connections[0]->c_struct_state == SLAP_C_UNINITIALIZED );
 172         assert( connections[NUM_CONNECTION_ARRAY-1]->c_struct_state ==
 173                 SLAP_C_UNINITIALIZED );
 174
 175         for ( i = 0; i < NUM_CONNECTION_ARRAY; i++ ) {
 176                 conn = connections[i];
 177                 for ( j = 0; j < (dtblsize/NUM_CONNECTION_ARRAY); j++ ) {
 178                         conn[j].c_conn_idx = j;
 179                 }
 180         }
 181
 182         /*
 183          * per entry initialization of the Connection array initialization
 184          * will be done by connection_init()
 185          */
 186
 187         return 0;
 188 }
 189 #else
 190 {
 191         int i;
 192
 193         assert( connections == NULL );
 194
 195         if( connections != NULL) {
 196                 Debug( LDAP_DEBUG_ANY, "connections_init: already initialized.\n",
 197                         0, 0, 0 );
 198                 return -1;
 199         }
 200
 201         /* should check return of every call */
 202         ldap_pvt_thread_mutex_init( &connections_mutex );
 203         ldap_pvt_thread_mutex_init( &conn_nextid_mutex );
 204
 205         connections = (Connection *) ch_calloc( dtblsize, sizeof(Connection) );
 206
 207         if( connections == NULL ) {
 208                 Debug( LDAP_DEBUG_ANY, "connections_init: "
 209                         "allocation (%d*%ld) of connection array failed\n",
 210                         dtblsize, (long) sizeof(Connection), 0 );
 211                 return -1;
 212         }
 213
 214         assert( connections[0].c_struct_state == SLAP_C_UNINITIALIZED );
 215         assert( connections[dtblsize-1].c_struct_state == SLAP_C_UNINITIALIZED );
 216
 217         for (i=0; i<dtblsize; i++) connections[i].c_conn_idx = i;
 218
 219         /*
 220          * per entry initialization of the Connection array initialization
 221          * will be done by connection_init()
 222          */
 223
 224         return 0;
 225 }
 226 #endif
 227
 228 /*
 229  * Destroy connection management infrastructure.
 230  */
 231
 232 int connections_destroy(void)
 233 #ifdef SLAP_MULTI_CONN_ARRAY
 234 {
 235         int i;
 236         ber_socket_t j;
 237
 238         if( connections == NULL) {
 239                 Debug( LDAP_DEBUG_ANY, "connections_destroy: nothing to destroy.\n",
 240                         0, 0, 0 );
 241                 return -1;
 242         }
 243
 244     for ( i = 0; i < NUM_CONNECTION_ARRAY; i++ ) {
 245                 Connection* conn = connections[i];
 246                 for ( j = 0; j < (dtblsize/NUM_CONNECTION_ARRAY); j++ ) {
 247                         if( conn[j].c_struct_state != SLAP_C_UNINITIALIZED ) {
 248                                 ber_sockbuf_free( conn[j].c_sb );
 249                                 ldap_pvt_thread_mutex_destroy( &conn[j].c_mutex );
 250                                 ldap_pvt_thread_mutex_destroy( &conn[j].c_write_mutex );
 251                                 ldap_pvt_thread_cond_destroy( &conn[j].c_write_cv );
 252 #ifdef LDAP_SLAPI
 253                                 /* FIX ME!! */
 254                                 if ( slapi_plugins_used ) {
 255                                         slapi_int_free_object_extensions( SLAPI_X_EXT_CONNECTION,
 256                                                 &connections[i] );
 257                                 }
 258 #endif
 259                         }
 260                 }
 261         }
 262
 263         for ( i = 0; i < NUM_CONNECTION_ARRAY; i++ ) {
 264                 free( connections[i] );
 265                 connections[i] = NULL;
 266                 ldap_pvt_thread_mutex_destroy( &connections_mutex[i] );
 267         }
 268
 269         ldap_pvt_thread_mutex_destroy( &conn_nextid_mutex );
 270
 271         return 0;
 272
 273 }
 274 #else
 275 {
 276         ber_socket_t i;
 277
 278         /* should check return of every call */
 279
 280         if( connections == NULL) {
 281                 Debug( LDAP_DEBUG_ANY, "connections_destroy: nothing to destroy.\n",
 282                         0, 0, 0 );
 283                 return -1;
 284         }
 285
 286         for ( i = 0; i < dtblsize; i++ ) {
 287                 if( connections[i].c_struct_state != SLAP_C_UNINITIALIZED ) {
 288                         ber_sockbuf_free( connections[i].c_sb );
 289                         ldap_pvt_thread_mutex_destroy( &connections[i].c_mutex );
 290                         ldap_pvt_thread_mutex_destroy( &connections[i].c_write_mutex );
 291                         ldap_pvt_thread_cond_destroy( &connections[i].c_write_cv );
 292 #ifdef LDAP_SLAPI
 293                         if ( slapi_plugins_used ) {
 294                                 slapi_int_free_object_extensions( SLAPI_X_EXT_CONNECTION,
 295                                         &connections[i] );
 296                         }
 297 #endif
 298                 }
 299         }
 300
 301         free( connections );
 302         connections = NULL;
 303
 304         ldap_pvt_thread_mutex_destroy( &connections_mutex );
 305         ldap_pvt_thread_mutex_destroy( &conn_nextid_mutex );
 306         return 0;
 307 }
 308 #endif
 309
 310 /*
 311  * shutdown all connections
 312  */
 313 int connections_shutdown(void)
 314 #ifdef SLAP_MULTI_CONN_ARRAY
 315 {
 316         int i;
 317         ber_socket_t j;
 318
 319         for ( i = 0; i < NUM_CONNECTION_ARRAY; i++ ) {
 320                 Connection* conn = connections[i];
 321                 ldap_pvt_thread_mutex_lock( &connections_mutex[i] );
 322                 for ( j = 0; j < (dtblsize/NUM_CONNECTION_ARRAY); j++ ) {
 323                         if( conn[j].c_struct_state != SLAP_C_USED ) {
 324                                 continue;
 325                         }
 326                         /* give persistent clients a chance to cleanup */
 327                         if( conn[j].c_conn_state == SLAP_C_CLIENT ) {
 328                                 ldap_pvt_thread_pool_submit( &connection_pool,
 329                                 conn[j].c_clientfunc, conn[j].c_clientarg );
 330                                 continue;
 331                         }
 332
 333                         ldap_pvt_thread_mutex_lock( &conn[j].c_mutex );
 334                         /* connections_mutex and c_mutex are locked */
 335                         connection_closing( &conn[j], "connection shutdown" );
 336                         connection_close( &conn[j] );
 337                         ldap_pvt_thread_mutex_unlock( &conn[j].c_mutex );
 338                 }
 339
 340                 ldap_pvt_thread_mutex_unlock( &connections_mutex[i] );
 341         }
 342
 343         return 0;
 344
 345 }
 346 #else
 347 {
 348         ber_socket_t i;
 349
 350         ldap_pvt_thread_mutex_lock( &connections_mutex );
 351
 352         for ( i = 0; i < dtblsize; i++ ) {
 353                 if( connections[i].c_struct_state != SLAP_C_USED ) {
 354                         continue;
 355                 }
 356                 /* give persistent clients a chance to cleanup */
 357                 if( connections[i].c_conn_state == SLAP_C_CLIENT ) {
 358                         ldap_pvt_thread_pool_submit( &connection_pool,
 359                         connections[i].c_clientfunc, connections[i].c_clientarg );
 360                         continue;
 361                 }
 362
 363                 ldap_pvt_thread_mutex_lock( &connections[i].c_mutex );
 364
 365                 /* connections_mutex and c_mutex are locked */
 366                 connection_closing( &connections[i], "slapd shutdown" );
 367                 connection_close( &connections[i] );
 368
 369                 ldap_pvt_thread_mutex_unlock( &connections[i].c_mutex );
 370         }
 371
 372         ldap_pvt_thread_mutex_unlock( &connections_mutex );
 373
 374         return 0;
 375 }
 376 #endif
 377
 378 /*
 379  * Timeout idle connections.
 380  */
 381 int connections_timeout_idle(time_t now)
 382 {
 383         int i = 0;
 384         int connindex;
 385         Connection* c;
 386
 387         for( c = connection_first( &connindex );
 388                 c != NULL;
 389                 c = connection_next( c, &connindex ) )
 390         {
 391                 /* Don't timeout a slow-running request or a persistent
 392                  * outbound connection */
 393                 if( c->c_n_ops_executing || c->c_conn_state == SLAP_C_CLIENT ) {
 394                         continue;
 395                 }
 396
 397                 if( difftime( c->c_activitytime+global_idletimeout, now) < 0 ) {
 398                         /* close it */
 399                         connection_closing( c, "idletimeout" );
 400                         connection_close( c );
 401                         i++;
 402                 }
 403         }
 404         connection_done( c );
 405
 406         return i;
 407 }
 408
 409 static Connection* connection_get( ber_socket_t s )
 410 {
 411         /* connections_mutex should be locked by caller */
 412
 413         Connection *c;
 414
 415         Debug( LDAP_DEBUG_ARGS,
 416                 "connection_get(%ld)\n",
 417                 (long) s, 0, 0 );
 418
 419         assert( connections != NULL );
 420
 421         if(s == AC_SOCKET_INVALID) return NULL;
 422
 423 #ifndef HAVE_WINSOCK
 424         c = MCA_GET_CONNECTION(s);
 425
 426         assert( c->c_struct_state != SLAP_C_UNINITIALIZED );
 427
 428 #else
 429         c = NULL;
 430         {
 431                 ber_socket_t i, sd;
 432
 433                 for(i=0; i<dtblsize; i++) {
 434                         if( connections[i].c_struct_state == SLAP_C_UNINITIALIZED ) {
 435                                 assert( connections[i].c_conn_state == SLAP_C_INVALID );
 436                                 assert( connections[i].c_sb == 0 );
 437                                 break;
 438                         }
 439
 440                         ber_sockbuf_ctrl( connections[i].c_sb,
 441                                 LBER_SB_OPT_GET_FD, &sd );
 442
 443                         if( connections[i].c_struct_state == SLAP_C_UNUSED ) {
 444                                 assert( connections[i].c_conn_state == SLAP_C_INVALID );
 445                                 assert( sd == AC_SOCKET_INVALID );
 446                                 continue;
 447                         }
 448
 449                         /* state can actually change from used -> unused by resched,
 450                          * so don't assert details here.
 451                          */
 452
 453                         if( sd == s ) {
 454                                 c = &connections[i];
 455                                 break;
 456                         }
 457                 }
 458         }
 459 #endif
 460
 461         if( c != NULL ) {
 462                 ber_socket_t    sd;
 463
 464                 ldap_pvt_thread_mutex_lock( &c->c_mutex );
 465
 466                 ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_GET_FD, &sd );
 467                 if( c->c_struct_state != SLAP_C_USED ) {
 468                         /* connection must have been closed due to resched */
 469
 470                         assert( c->c_conn_state == SLAP_C_INVALID );
 471                         assert( sd == AC_SOCKET_INVALID );
 472
 473                         Debug( LDAP_DEBUG_TRACE,
 474                                 "connection_get(%d): connection not used\n",
 475                                 s, 0, 0 );
 476
 477                         ldap_pvt_thread_mutex_unlock( &c->c_mutex );
 478                         return NULL;
 479                 }
 480
 481                 Debug( LDAP_DEBUG_TRACE,
 482                         "connection_get(%d): got connid=%lu\n",
 483                         s, c->c_connid, 0 );
 484
 485                 c->c_n_get++;
 486
 487                 assert( c->c_struct_state == SLAP_C_USED );
 488                 assert( c->c_conn_state != SLAP_C_INVALID );
 489                 assert( sd != AC_SOCKET_INVALID );
 490
 491 #ifndef SLAPD_MONITOR
 492                 if ( global_idletimeout > 0 )
 493 #endif /* ! SLAPD_MONITOR */
 494                 {
 495                         c->c_activitytime = slap_get_time();
 496                 }
 497         }
 498
 499         return c;
 500 }
 501
 502 static void connection_return( Connection *c )
 503 {
 504         ldap_pvt_thread_mutex_unlock( &c->c_mutex );
 505 }
 506
 507 long connection_init(
 508         ber_socket_t s,
 509         Listener *listener,
 510         const char* dnsname,
 511         const char* peername,
 512         int flags,
 513         slap_ssf_t ssf,
 514         struct berval *authid )
 515 {
 516         unsigned long id;
 517         Connection *c;
 518
 519         assert( connections != NULL );
 520
 521         assert( listener != NULL );
 522         assert( dnsname != NULL );
 523         assert( peername != NULL );
 524
 525 #ifndef HAVE_TLS
 526         assert( flags != CONN_IS_TLS );
 527 #endif
 528
 529         if( s == AC_SOCKET_INVALID ) {
 530                 Debug( LDAP_DEBUG_ANY,
 531                         "connection_init: init of socket %ld invalid.\n", (long)s, 0, 0 );
 532                 return -1;
 533         }
 534
 535         assert( s >= 0 );
 536 #ifndef HAVE_WINSOCK
 537         assert( s < dtblsize );
 538 #endif
 539
 540         ldap_pvt_thread_mutex_lock( MCA_GET_CONN_MUTEX(s) );
 541
 542 #ifndef HAVE_WINSOCK
 543         c = MCA_GET_CONNECTION(s);
 544 #else
 545         {
 546                 ber_socket_t i;
 547                 c = NULL;
 548
 549                 for( i=0; i < dtblsize; i++) {
 550                         ber_socket_t    sd;
 551
 552                         if( connections[i].c_struct_state == SLAP_C_UNINITIALIZED ) {
 553                                 assert( connections[i].c_sb == 0 );
 554                                 c = &connections[i];
 555                                 break;
 556                         }
 557
 558                         sd = AC_SOCKET_INVALID;
 559                         if (connections[i].c_sb != NULL) {
 560                                 ber_sockbuf_ctrl( connections[i].c_sb,
 561                                         LBER_SB_OPT_GET_FD, &sd );
 562                         }
 563
 564                         if( connections[i].c_struct_state == SLAP_C_UNUSED ) {
 565                                 assert( sd == AC_SOCKET_INVALID );
 566                                 c = &connections[i];
 567                                 break;
 568                         }
 569
 570                         if( connections[i].c_conn_state == SLAP_C_CLIENT ) continue;
 571
 572                         assert( connections[i].c_struct_state == SLAP_C_USED );
 573                         assert( connections[i].c_conn_state != SLAP_C_INVALID );
 574                         assert( sd != AC_SOCKET_INVALID );
 575                 }
 576
 577                 if( c == NULL ) {
 578                         Debug( LDAP_DEBUG_ANY,
 579                                 "connection_init(%d): connection table full "
 580                                 "(%d/%d)\n", s, i, dtblsize);
 581                         ldap_pvt_thread_mutex_unlock( &connections_mutex );
 582                         return -1;
 583                 }
 584         }
 585 #endif
 586
 587         assert( c != NULL );
 588
 589         if( c->c_struct_state == SLAP_C_UNINITIALIZED ) {
 590                 c->c_send_ldap_result = slap_send_ldap_result;
 591                 c->c_send_search_entry = slap_send_search_entry;
 592                 c->c_send_search_reference = slap_send_search_reference;
 593                 c->c_send_ldap_extended = slap_send_ldap_extended;
 594 #ifdef LDAP_RES_INTERMEDIATE
 595                 c->c_send_ldap_intermediate = slap_send_ldap_intermediate;
 596 #endif
 597
 598                 BER_BVZERO( &c->c_authmech );
 599                 BER_BVZERO( &c->c_dn );
 600                 BER_BVZERO( &c->c_ndn );
 601
 602                 c->c_listener = NULL;
 603                 BER_BVZERO( &c->c_peer_domain );
 604                 BER_BVZERO( &c->c_peer_name );
 605
 606                 LDAP_STAILQ_INIT(&c->c_ops);
 607                 LDAP_STAILQ_INIT(&c->c_pending_ops);
 608
 609                 BER_BVZERO( &c->c_sasl_bind_mech );
 610                 c->c_sasl_done = 0;
 611                 c->c_sasl_authctx = NULL;
 612                 c->c_sasl_sockctx = NULL;
 613                 c->c_sasl_extra = NULL;
 614                 c->c_sasl_bindop = NULL;
 615
 616                 c->c_sb = ber_sockbuf_alloc( );
 617
 618                 {
 619                         ber_len_t max = sockbuf_max_incoming;
 620                         ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_SET_MAX_INCOMING, &max );
 621                 }
 622
 623                 c->c_currentber = NULL;
 624
 625                 /* should check status of thread calls */
 626                 ldap_pvt_thread_mutex_init( &c->c_mutex );
 627                 ldap_pvt_thread_mutex_init( &c->c_write_mutex );
 628                 ldap_pvt_thread_cond_init( &c->c_write_cv );
 629
 630 #ifdef LDAP_SLAPI
 631                 if ( slapi_plugins_used ) {
 632                         slapi_int_create_object_extensions( SLAPI_X_EXT_CONNECTION, c );
 633                 }
 634 #endif
 635
 636                 c->c_struct_state = SLAP_C_UNUSED;
 637         }
 638
 639         ldap_pvt_thread_mutex_lock( &c->c_mutex );
 640
 641         assert( c->c_struct_state == SLAP_C_UNUSED );
 642         assert( BER_BVISNULL( &c->c_authmech ) );
 643         assert( BER_BVISNULL( &c->c_dn ) );
 644         assert( BER_BVISNULL( &c->c_ndn ) );
 645         assert( c->c_listener == NULL );
 646         assert( BER_BVISNULL( &c->c_peer_domain ) );
 647         assert( BER_BVISNULL( &c->c_peer_name ) );
 648         assert( LDAP_STAILQ_EMPTY(&c->c_ops) );
 649         assert( LDAP_STAILQ_EMPTY(&c->c_pending_ops) );
 650         assert( BER_BVISNULL( &c->c_sasl_bind_mech ) );
 651         assert( c->c_sasl_done == 0 );
 652         assert( c->c_sasl_authctx == NULL );
 653         assert( c->c_sasl_sockctx == NULL );
 654         assert( c->c_sasl_extra == NULL );
 655         assert( c->c_sasl_bindop == NULL );
 656         assert( c->c_currentber == NULL );
 657         assert( c->c_writewaiter == 0);
 658
 659         c->c_listener = listener;
 660
 661         if ( flags == CONN_IS_CLIENT ) {
 662                 c->c_conn_state = SLAP_C_CLIENT;
 663                 c->c_struct_state = SLAP_C_USED;
 664                 c->c_close_reason = "?";                        /* should never be needed */
 665                 ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_SET_FD, &s );
 666                 ldap_pvt_thread_mutex_unlock( &c->c_mutex );
 667                 ldap_pvt_thread_mutex_unlock( MCA_GET_CONN_MUTEX(s) );
 668
 669                 return 0;
 670         }
 671
 672         ber_str2bv( dnsname, 0, 1, &c->c_peer_domain );
 673         ber_str2bv( peername, 0, 1, &c->c_peer_name );
 674
 675         c->c_n_ops_received = 0;
 676         c->c_n_ops_executing = 0;
 677         c->c_n_ops_pending = 0;
 678         c->c_n_ops_completed = 0;
 679
 680         c->c_n_get = 0;
 681         c->c_n_read = 0;
 682         c->c_n_write = 0;
 683
 684         /* set to zero until bind, implies LDAP_VERSION3 */
 685         c->c_protocol = 0;
 686
 687 #ifndef SLAPD_MONITOR
 688         if ( global_idletimeout > 0 )
 689 #endif /* ! SLAPD_MONITOR */
 690         {
 691                 c->c_activitytime = c->c_starttime = slap_get_time();
 692         }
 693
 694 #ifdef LDAP_CONNECTIONLESS
 695         c->c_is_udp = 0;
 696         if( flags == CONN_IS_UDP ) {
 697                 c->c_is_udp = 1;
 698 #ifdef LDAP_DEBUG
 699                 ber_sockbuf_add_io( c->c_sb, &ber_sockbuf_io_debug,
 700                         LBER_SBIOD_LEVEL_PROVIDER, (void*)"udp_" );
 701 #endif
 702                 ber_sockbuf_add_io( c->c_sb, &ber_sockbuf_io_udp,
 703                         LBER_SBIOD_LEVEL_PROVIDER, (void *)&s );
 704                 ber_sockbuf_add_io( c->c_sb, &ber_sockbuf_io_readahead,
 705                         LBER_SBIOD_LEVEL_PROVIDER, NULL );
 706         } else
 707 #endif
 708         {
 709 #ifdef LDAP_DEBUG
 710                 ber_sockbuf_add_io( c->c_sb, &ber_sockbuf_io_debug,
 711                         LBER_SBIOD_LEVEL_PROVIDER, (void*)"tcp_" );
 712 #endif
 713                 ber_sockbuf_add_io( c->c_sb, &ber_sockbuf_io_tcp,
 714                         LBER_SBIOD_LEVEL_PROVIDER, (void *)&s );
 715         }
 716
 717 #ifdef LDAP_DEBUG
 718         ber_sockbuf_add_io( c->c_sb, &ber_sockbuf_io_debug,
 719                 INT_MAX, (void*)"ldap_" );
 720 #endif
 721
 722         if( ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_SET_NONBLOCK,
 723                 c /* non-NULL */ ) < 0 )
 724         {
 725                 Debug( LDAP_DEBUG_ANY,
 726                         "connection_init(%d, %s): set nonblocking failed\n",
 727                         s, c->c_peer_name.bv_val, 0 );
 728         }
 729
 730         ldap_pvt_thread_mutex_lock( &conn_nextid_mutex );
 731         id = c->c_connid = conn_nextid++;
 732         ldap_pvt_thread_mutex_unlock( &conn_nextid_mutex );
 733
 734         c->c_conn_state = SLAP_C_INACTIVE;
 735         c->c_struct_state = SLAP_C_USED;
 736         c->c_close_reason = "?";                        /* should never be needed */
 737
 738         c->c_ssf = c->c_transport_ssf = ssf;
 739         c->c_tls_ssf = 0;
 740
 741 #ifdef HAVE_TLS
 742         if ( flags == CONN_IS_TLS ) {
 743                 c->c_is_tls = 1;
 744                 c->c_needs_tls_accept = 1;
 745         } else {
 746                 c->c_is_tls = 0;
 747                 c->c_needs_tls_accept = 0;
 748         }
 749 #endif
 750
 751         slap_sasl_open( c, 0 );
 752         slap_sasl_external( c, ssf, authid );
 753
 754         ldap_pvt_thread_mutex_unlock( &c->c_mutex );
 755         ldap_pvt_thread_mutex_unlock( MCA_GET_CONN_MUTEX(s) );
 756
 757         backend_connection_init(c);
 758
 759         return id;
 760 }
 761
 762 void connection2anonymous( Connection *c )
 763 {
 764         assert( connections != NULL );
 765         assert( c != NULL );
 766
 767         {
 768                 ber_len_t max = sockbuf_max_incoming;
 769                 ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_SET_MAX_INCOMING, &max );
 770         }
 771
 772         if ( !BER_BVISNULL( &c->c_authmech ) ) {
 773                 ch_free(c->c_authmech.bv_val);
 774         }
 775         BER_BVZERO( &c->c_authmech );
 776
 777         if ( !BER_BVISNULL( &c->c_dn ) ) {
 778                 ch_free(c->c_dn.bv_val);
 779         }
 780         BER_BVZERO( &c->c_dn );
 781
 782         if ( !BER_BVISNULL( &c->c_ndn ) ) {
 783                 ch_free(c->c_ndn.bv_val);
 784         }
 785         BER_BVZERO( &c->c_ndn );
 786
 787         if ( !BER_BVISNULL( &c->c_sasl_authz_dn ) ) {
 788                 ber_memfree_x( c->c_sasl_authz_dn.bv_val, NULL );
 789         }
 790         BER_BVZERO( &c->c_sasl_authz_dn );
 791
 792         c->c_authz_backend = NULL;
 793 }
 794
 795 static void
 796 connection_destroy( Connection *c )
 797 {
 798         /* note: connections_mutex should be locked by caller */
 799         ber_socket_t    sd;
 800         unsigned long   connid;
 801         const char              *close_reason;
 802
 803         assert( connections != NULL );
 804         assert( c != NULL );
 805         assert( c->c_struct_state != SLAP_C_UNUSED );
 806         assert( c->c_conn_state != SLAP_C_INVALID );
 807         assert( LDAP_STAILQ_EMPTY(&c->c_ops) );
 808         assert( c->c_writewaiter == 0);
 809
 810         /* only for stats (print -1 as "%lu" may give unexpected results ;) */
 811         connid = c->c_connid;
 812         close_reason = c->c_close_reason;
 813
 814         backend_connection_destroy(c);
 815
 816         c->c_protocol = 0;
 817         c->c_connid = -1;
 818
 819         c->c_activitytime = c->c_starttime = 0;
 820
 821         connection2anonymous( c );
 822         c->c_listener = NULL;
 823
 824         if(c->c_peer_domain.bv_val != NULL) {
 825                 free(c->c_peer_domain.bv_val);
 826         }
 827         BER_BVZERO( &c->c_peer_domain );
 828         if(c->c_peer_name.bv_val != NULL) {
 829                 free(c->c_peer_name.bv_val);
 830         }
 831         BER_BVZERO( &c->c_peer_name );
 832
 833         c->c_sasl_bind_in_progress = 0;
 834         if(c->c_sasl_bind_mech.bv_val != NULL) {
 835                 free(c->c_sasl_bind_mech.bv_val);
 836         }
 837         BER_BVZERO( &c->c_sasl_bind_mech );
 838
 839         slap_sasl_close( c );
 840
 841         if ( c->c_currentber != NULL ) {
 842                 ber_free( c->c_currentber, 1 );
 843                 c->c_currentber = NULL;
 844         }
 845
 846         ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_GET_FD, &sd );
 847         slapd_sd_lock();
 848         ber_sockbuf_free( c->c_sb );
 849         if ( sd != AC_SOCKET_INVALID ) {
 850                 slapd_remove( sd, 1, 0, 1 );
 851
 852                 Statslog( LDAP_DEBUG_STATS, (close_reason
 853                                                                          ? "conn=%lu fd=%ld closed (%s)\n"
 854                                                                          : "conn=%lu fd=%ld closed\n"),
 855                         connid, (long) sd, close_reason, 0, 0 );
 856         } else {
 857                 slapd_sd_unlock();
 858         }
 859
 860         c->c_sb = ber_sockbuf_alloc( );
 861
 862         {
 863                 ber_len_t max = sockbuf_max_incoming;
 864                 ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_SET_MAX_INCOMING, &max );
 865         }
 866
 867         c->c_conn_state = SLAP_C_INVALID;
 868         c->c_struct_state = SLAP_C_UNUSED;
 869         c->c_close_reason = "?";                        /* should never be needed */
 870
 871 #ifdef LDAP_SLAPI
 872         /* call destructors, then constructors; avoids unnecessary allocation */
 873         if ( slapi_plugins_used ) {
 874                 slapi_int_clear_object_extensions( SLAPI_X_EXT_CONNECTION, c );
 875         }
 876 #endif
 877 }
 878
 879 int connection_state_closing( Connection *c )
 880 {
 881         /* c_mutex must be locked by caller */
 882
 883         int state;
 884         assert( c != NULL );
 885         assert( c->c_struct_state == SLAP_C_USED );
 886
 887         state = c->c_conn_state;
 888
 889         assert( state != SLAP_C_INVALID );
 890
 891         return state == SLAP_C_CLOSING;
 892 }
 893
 894 static void connection_abandon( Connection *c )
 895 {
 896         /* c_mutex must be locked by caller */
 897
 898         Operation *o, *next, op = {0};
 899         Opheader ohdr = {0};
 900         SlapReply rs = {0};
 901
 902         op.o_hdr = &ohdr;
 903         op.o_conn = c;
 904         op.o_connid = c->c_connid;
 905         op.o_tag = LDAP_REQ_ABANDON;
 906         for ( o = LDAP_STAILQ_FIRST( &c->c_ops ); o; o=next ) {
 907                 next = LDAP_STAILQ_NEXT( o, o_next );
 908                 op.orn_msgid = o->o_msgid;
 909                 o->o_abandon = 1;
 910                 op.o_bd = frontendDB;
 911                 frontendDB->be_abandon( &op, &rs );
 912         }
 913
 914         /* remove pending operations */
 915         while ( (o = LDAP_STAILQ_FIRST( &c->c_pending_ops )) != NULL) {
 916                 LDAP_STAILQ_REMOVE_HEAD( &c->c_pending_ops, o_next );
 917                 LDAP_STAILQ_NEXT(o, o_next) = NULL;
 918                 slap_op_free( o );
 919         }
 920 }
 921
 922 void connection_closing( Connection *c, const char *why )
 923 {
 924         assert( connections != NULL );
 925         assert( c != NULL );
 926         assert( c->c_struct_state == SLAP_C_USED );
 927         assert( c->c_conn_state != SLAP_C_INVALID );
 928
 929         /* c_mutex must be locked by caller */
 930
 931         if( c->c_conn_state != SLAP_C_CLOSING ) {
 932                 ber_socket_t    sd;
 933
 934                 ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_GET_FD, &sd );
 935                 Debug( LDAP_DEBUG_TRACE,
 936                         "connection_closing: readying conn=%lu sd=%d for close\n",
 937                         c->c_connid, sd, 0 );
 938                 /* update state to closing */
 939                 c->c_conn_state = SLAP_C_CLOSING;
 940                 c->c_close_reason = why;
 941
 942                 /* don't listen on this port anymore */
 943                 slapd_clr_read( sd, 1 );
 944
 945                 /* abandon active operations */
 946                 connection_abandon( c );
 947
 948                 /* wake write blocked operations */
 949                 slapd_clr_write( sd, 1 );
 950                 if ( c->c_writewaiter ) {
 951                         ldap_pvt_thread_cond_signal( &c->c_write_cv );
 952                         ldap_pvt_thread_mutex_unlock( &c->c_mutex );
 953                         ldap_pvt_thread_yield();
 954                         ldap_pvt_thread_mutex_lock( &c->c_mutex );
 955                 }
 956         } else if( why == NULL && c->c_close_reason == conn_lost_str ) {
 957                 /* Client closed connection after doing Unbind. */
 958                 c->c_close_reason = NULL;
 959         }
 960 }
 961
 962 static void connection_close( Connection *c )
 963 {
 964         ber_socket_t    sd;
 965
 966         assert( connections != NULL );
 967         assert( c != NULL );
 968         assert( c->c_struct_state == SLAP_C_USED );
 969         assert( c->c_conn_state == SLAP_C_CLOSING );
 970
 971         /* note: connections_mutex and c_mutex should be locked by caller */
 972
 973         ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_GET_FD, &sd );
 974         if( !LDAP_STAILQ_EMPTY(&c->c_ops) ) {
 975                 Debug( LDAP_DEBUG_TRACE,
 976                         "connection_close: deferring conn=%lu sd=%d\n",
 977                         c->c_connid, sd, 0 );
 978                 return;
 979         }
 980
 981         Debug( LDAP_DEBUG_TRACE, "connection_close: conn=%lu sd=%d\n",
 982                 c->c_connid, sd, 0 );
 983         connection_destroy( c );
 984 }
 985
 986 unsigned long connections_nextid(void)
 987 {
 988         unsigned long id;
 989         assert( connections != NULL );
 990
 991         ldap_pvt_thread_mutex_lock( &conn_nextid_mutex );
 992
 993         id = conn_nextid;
 994
 995         ldap_pvt_thread_mutex_unlock( &conn_nextid_mutex );
 996
 997         return id;
 998 }
 999
1000 Connection* connection_first( ber_socket_t *index )
1001 {
1002 #ifdef SLAP_MULTI_CONN_ARRAY
1003         int conn_array_id;
1004 #endif
1005
1006         assert( connections != NULL );
1007         assert( index != NULL );
1008
1009 #ifdef SLAP_MULTI_CONN_ARRAY
1010         for ( conn_array_id = 0;
1011                 conn_array_id < NUM_CONNECTION_ARRAY;
1012                 conn_array_id++ )
1013         {
1014                 ldap_pvt_thread_mutex_lock( &connections_mutex[ conn_array_id ] );
1015         }
1016 #else
1017         ldap_pvt_thread_mutex_lock( &connections_mutex );
1018 #endif
1019
1020         *index = 0;
1021
1022         return connection_next(NULL, index);
1023 }
1024
1025 Connection* connection_next( Connection *c, ber_socket_t *index )
1026 #ifdef SLAP_MULTI_CONN_ARRAY
1027 {
1028         Connection* conn;
1029
1030         assert( connections != NULL );
1031         assert( index != NULL );
1032         assert( *index <= (dtblsize/NUM_CONNECTION_ARRAY) );
1033
1034         if( c != NULL ) ldap_pvt_thread_mutex_unlock( &c->c_mutex );
1035
1036         c = NULL;
1037
1038         for(; *index < dtblsize; (*index)++) {
1039                 conn = MCA_GET_CONNECTION(*index);
1040                 if( conn->c_struct_state == SLAP_C_UNINITIALIZED ) {
1041                         assert( conn->c_conn_state == SLAP_C_INVALID );
1042 #ifndef HAVE_WINSOCK
1043                         continue;
1044 #else
1045                         break;
1046 #endif
1047                 }
1048
1049                 if( conn->c_struct_state == SLAP_C_USED ) {
1050                         assert( conn->c_conn_state != SLAP_C_INVALID );
1051                         c = conn;
1052                         (*index)++;
1053                         break;
1054                 }
1055
1056                 assert( conn->c_struct_state == SLAP_C_UNUSED );
1057                 assert( conn->c_conn_state == SLAP_C_INVALID );
1058         }
1059
1060         if( c != NULL ) ldap_pvt_thread_mutex_lock( &c->c_mutex );
1061
1062         return c;
1063
1064 }
1065 #else
1066 {
1067         assert( connections != NULL );
1068         assert( index != NULL );
1069         assert( *index <= dtblsize );
1070
1071         if( c != NULL ) ldap_pvt_thread_mutex_unlock( &c->c_mutex );
1072
1073         c = NULL;
1074
1075         for(; *index < dtblsize; (*index)++) {
1076                 if( connections[*index].c_struct_state == SLAP_C_UNINITIALIZED ) {
1077                         assert( connections[*index].c_conn_state == SLAP_C_INVALID );
1078 #ifndef HAVE_WINSOCK
1079                         continue;
1080 #else
1081                         break;
1082 #endif
1083                 }
1084
1085                 if( connections[*index].c_struct_state == SLAP_C_USED ) {
1086                         assert( connections[*index].c_conn_state != SLAP_C_INVALID );
1087                         c = &connections[(*index)++];
1088                         break;
1089                 }
1090
1091                 assert( connections[*index].c_struct_state == SLAP_C_UNUSED );
1092                 assert( connections[*index].c_conn_state == SLAP_C_INVALID );
1093         }
1094
1095         if( c != NULL ) ldap_pvt_thread_mutex_lock( &c->c_mutex );
1096         return c;
1097 }
1098 #endif
1099
1100 void connection_done( Connection *c )
1101 {
1102 #ifdef SLAP_MULTI_CONN_ARRAY
1103         int conn_array_id;
1104 #endif
1105
1106         assert( connections != NULL );
1107
1108         if( c != NULL ) ldap_pvt_thread_mutex_unlock( &c->c_mutex );
1109
1110 #ifdef SLAP_MULTI_CONN_ARRAY
1111         for ( conn_array_id = 0;
1112                 conn_array_id < NUM_CONNECTION_ARRAY;
1113                 conn_array_id++ )
1114         {
1115                 ldap_pvt_thread_mutex_unlock( &connections_mutex[ conn_array_id ] );
1116         }
1117 #else
1118         ldap_pvt_thread_mutex_unlock( &connections_mutex );
1119 #endif
1120 }
1121
1122 /*
1123  * connection_activity - handle the request operation op on connection
1124  * conn.  This routine figures out what kind of operation it is and
1125  * calls the appropriate stub to handle it.
1126  */
1127
1128 #ifdef SLAPD_MONITOR
1129 /* FIXME: returns 0 in case of failure */
1130 #define INCR_OP_INITIATED(index) \
1131         do { \
1132                 ldap_pvt_thread_mutex_lock( &slap_counters.sc_ops_mutex ); \
1133                 ldap_pvt_mp_add_ulong(slap_counters.sc_ops_initiated_[(index)], 1); \
1134                 ldap_pvt_thread_mutex_unlock( &slap_counters.sc_ops_mutex ); \
1135         } while (0)
1136 #define INCR_OP_COMPLETED(index) \
1137         do { \
1138                 ldap_pvt_thread_mutex_lock( &slap_counters.sc_ops_mutex ); \
1139                 ldap_pvt_mp_add_ulong(slap_counters.sc_ops_completed, 1); \
1140                 ldap_pvt_mp_add_ulong(slap_counters.sc_ops_completed_[(index)], 1); \
1141                 ldap_pvt_thread_mutex_unlock( &slap_counters.sc_ops_mutex ); \
1142         } while (0)
1143 #else /* !SLAPD_MONITOR */
1144 #define INCR_OP_INITIATED(index) do { } while (0)
1145 #define INCR_OP_COMPLETED(index) \
1146         do { \
1147                 ldap_pvt_thread_mutex_lock( &slap_counters.sc_ops_mutex ); \
1148                 ldap_pvt_mp_add_ulong(slap_counters.sc_ops_completed, 1); \
1149                 ldap_pvt_thread_mutex_unlock( &slap_counters.sc_ops_mutex ); \
1150         } while (0)
1151 #endif /* !SLAPD_MONITOR */
1152
1153 /*
1154  * NOTE: keep in sync with enum in slapd.h
1155  */
1156 static int (*opfun[])( Operation *op, SlapReply *rs ) = {
1157         do_bind,
1158         do_unbind,
1159         do_add,
1160         do_delete,
1161         do_modrdn,
1162         do_modify,
1163         do_compare,
1164         do_search,
1165         do_abandon,
1166         do_extended,
1167         NULL
1168 };
1169
1170 static void *
1171 connection_operation( void *ctx, void *arg_v )
1172 {
1173         int rc = LDAP_OTHER;
1174         Operation *op = arg_v;
1175         SlapReply rs = {REP_RESULT};
1176         ber_tag_t tag = op->o_tag;
1177         int opidx = -1;
1178         Connection *conn = op->o_conn;
1179         void *memctx = NULL;
1180         void *memctx_null = NULL;
1181         ber_len_t memsiz;
1182
1183         ldap_pvt_thread_mutex_lock( &slap_counters.sc_ops_mutex );
1184         /* FIXME: returns 0 in case of failure */
1185         ldap_pvt_mp_add_ulong(slap_counters.sc_ops_initiated, 1);
1186         ldap_pvt_thread_mutex_unlock( &slap_counters.sc_ops_mutex );
1187
1188         op->o_threadctx = ctx;
1189
1190         switch ( tag ) {
1191         case LDAP_REQ_BIND:
1192         case LDAP_REQ_UNBIND:
1193         case LDAP_REQ_ADD:
1194         case LDAP_REQ_DELETE:
1195         case LDAP_REQ_MODDN:
1196         case LDAP_REQ_MODIFY:
1197         case LDAP_REQ_COMPARE:
1198         case LDAP_REQ_SEARCH:
1199         case LDAP_REQ_ABANDON:
1200         case LDAP_REQ_EXTENDED:
1201                 break;
1202         default:
1203                 Debug( LDAP_DEBUG_ANY, "connection_operation: "
1204                         "conn %lu unknown LDAP request 0x%lx\n",
1205                         conn->c_connid, tag, 0 );
1206                 op->o_tag = LBER_ERROR;
1207                 rs.sr_err = LDAP_PROTOCOL_ERROR;
1208                 rs.sr_text = "unknown LDAP request";
1209                 send_ldap_disconnect( op, &rs );
1210                 rc = SLAPD_DISCONNECT;
1211                 goto operations_error;
1212         }
1213
1214         if( conn->c_sasl_bind_in_progress && tag != LDAP_REQ_BIND ) {
1215                 Debug( LDAP_DEBUG_ANY, "connection_operation: "
1216                         "error: SASL bind in progress (tag=%ld).\n",
1217                         (long) tag, 0, 0 );
1218                 send_ldap_error( op, &rs, LDAP_OPERATIONS_ERROR,
1219                         "SASL bind in progress" );
1220                 rc = LDAP_OPERATIONS_ERROR;
1221                 goto operations_error;
1222         }
1223
1224         /* We can use Thread-Local storage for most mallocs. We can
1225          * also use TL for ber parsing, but not on Add or Modify.
1226          */
1227 #if 0
1228         memsiz = ber_len( op->o_ber ) * 64;
1229         if ( SLAP_SLAB_SIZE > memsiz ) memsiz = SLAP_SLAB_SIZE;
1230 #endif
1231         memsiz = SLAP_SLAB_SIZE;
1232
1233         memctx = slap_sl_mem_create( memsiz, SLAP_SLAB_STACK, ctx );
1234         op->o_tmpmemctx = memctx;
1235         op->o_tmpmfuncs = &slap_sl_mfuncs;
1236         if ( tag != LDAP_REQ_ADD && tag != LDAP_REQ_MODIFY ) {
1237                 /* Note - the ber and its buffer are already allocated from
1238                  * regular memory; this only affects subsequent mallocs that
1239                  * ber_scanf may invoke.
1240                  */
1241                 ber_set_option( op->o_ber, LBER_OPT_BER_MEMCTX, &memctx );
1242         }
1243
1244         switch ( tag ) {
1245         case LDAP_REQ_BIND:
1246                 opidx = SLAP_OP_BIND;
1247                 break;
1248
1249         case LDAP_REQ_UNBIND:
1250                 opidx = SLAP_OP_UNBIND;
1251                 break;
1252
1253         case LDAP_REQ_ADD:
1254                 opidx = SLAP_OP_ADD;
1255                 break;
1256
1257         case LDAP_REQ_DELETE:
1258                 opidx = SLAP_OP_DELETE;
1259                 break;
1260
1261         case LDAP_REQ_MODRDN:
1262                 opidx = SLAP_OP_MODRDN;
1263                 break;
1264
1265         case LDAP_REQ_MODIFY:
1266                 opidx = SLAP_OP_MODIFY;
1267                 break;
1268
1269         case LDAP_REQ_COMPARE:
1270                 opidx = SLAP_OP_COMPARE;
1271                 break;
1272
1273         case LDAP_REQ_SEARCH:
1274                 opidx = SLAP_OP_SEARCH;
1275                 break;
1276
1277         case LDAP_REQ_ABANDON:
1278                 opidx = SLAP_OP_ABANDON;
1279                 break;
1280
1281         case LDAP_REQ_EXTENDED:
1282                 opidx = SLAP_OP_EXTENDED;
1283                 break;
1284
1285         default:
1286                 /* not reachable */
1287                 assert( 0 );
1288         }
1289
1290         assert( opidx > -1 );
1291         INCR_OP_INITIATED( opidx );
1292         rc = (*(opfun[opidx]))( op, &rs );
1293
1294 operations_error:
1295         if ( rc == SLAPD_DISCONNECT ) {
1296                 tag = LBER_ERROR;
1297
1298         } else if ( opidx > -1 ) {
1299                 /* increment completed operations count
1300                  * only if operation was initiated
1301                  * and rc != SLAPD_DISCONNECT */
1302                 INCR_OP_COMPLETED( opidx );
1303         }
1304
1305         if ( op->o_cancel == SLAP_CANCEL_REQ ) {
1306                 if ( rc == SLAPD_ABANDON ) {
1307                         op->o_cancel = SLAP_CANCEL_ACK;
1308                 } else {
1309                         op->o_cancel = LDAP_TOO_LATE;
1310                 }
1311         }
1312         while ( op->o_cancel != SLAP_CANCEL_NONE &&
1313                 op->o_cancel != SLAP_CANCEL_DONE )
1314         {
1315                 ldap_pvt_thread_yield();
1316         }
1317
1318         ldap_pvt_thread_mutex_lock( &conn->c_mutex );
1319
1320         ber_set_option( op->o_ber, LBER_OPT_BER_MEMCTX, &memctx_null );
1321
1322         LDAP_STAILQ_REMOVE( &conn->c_ops, op, slap_op, o_next);
1323         LDAP_STAILQ_NEXT(op, o_next) = NULL;
1324         slap_op_free( op );
1325         conn->c_n_ops_executing--;
1326         conn->c_n_ops_completed++;
1327
1328         switch( tag ) {
1329         case LBER_ERROR:
1330         case LDAP_REQ_UNBIND:
1331                 /* c_mutex is locked */
1332                 connection_closing( conn,
1333                         tag == LDAP_REQ_UNBIND ? NULL : "operations error" );
1334                 break;
1335
1336         case LDAP_REQ_BIND:
1337                 conn->c_sasl_bind_in_progress =
1338                         rc == LDAP_SASL_BIND_IN_PROGRESS ? 1 : 0;
1339
1340                 if( conn->c_conn_state == SLAP_C_BINDING) {
1341                         conn->c_conn_state = SLAP_C_ACTIVE;
1342                 }
1343         }
1344
1345         connection_resched( conn );
1346         ldap_pvt_thread_mutex_unlock( &conn->c_mutex );
1347         return NULL;
1348 }
1349
1350 static const Listener dummy_list = { BER_BVC(""), BER_BVC("") };
1351
1352 int connection_client_setup(
1353         ber_socket_t s,
1354         ldap_pvt_thread_start_t *func,
1355         void *arg )
1356 {
1357         int rc;
1358         Connection *c;
1359
1360         rc = connection_init( s, (Listener *)&dummy_list, "", "",
1361                 CONN_IS_CLIENT, 0, NULL );
1362         if ( rc < 0 ) return -1;
1363
1364         c = connection_get( s );
1365         c->c_clientfunc = func;
1366         c->c_clientarg = arg;
1367
1368         slapd_add_internal( s, 0 );
1369         slapd_set_read( s, 1 );
1370         connection_return( c );
1371         return 0;
1372 }
1373
1374 void connection_client_enable(
1375         ber_socket_t s )
1376 {
1377         slapd_set_read( s, 1 );
1378 }
1379
1380 void connection_client_stop(
1381         ber_socket_t s )
1382 {
1383         Connection *c;
1384
1385         /* get (locked) connection */
1386         c = connection_get( s );
1387
1388         assert( c->c_conn_state == SLAP_C_CLIENT );
1389
1390         c->c_listener = NULL;
1391         c->c_conn_state = SLAP_C_INVALID;
1392         c->c_struct_state = SLAP_C_UNUSED;
1393         c->c_close_reason = "?";                        /* should never be needed */
1394         slapd_sd_lock();
1395         ber_sockbuf_free( c->c_sb );
1396         c->c_sb = ber_sockbuf_alloc( );
1397         {
1398                 ber_len_t max = sockbuf_max_incoming;
1399                 ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_SET_MAX_INCOMING, &max );
1400         }
1401
1402         slapd_remove( s, 0, 1, 1 );
1403         connection_return( c );
1404 }
1405
1406 #ifdef SLAP_LIGHTWEIGHT_DISPATCHER
1407 static int connection_read( ber_socket_t s, Operation** op );
1408
1409 static void* connection_read_thread( void* ctx, void* argv )
1410 {
1411         int rc ;
1412         Operation* new_op = NULL;
1413         ber_socket_t s = (long)argv;
1414
1415         /*
1416          * read incoming LDAP requests. If there is more than one,
1417          * the first one is returned with new_op
1418          */
1419         if( ( rc = connection_read( s, &new_op ) ) < 0 ) {
1420                 Debug( LDAP_DEBUG_CONNS, "connection_read(%d) error\n", s, 0, 0 );
1421                 return (void*)(long)rc;
1422         }
1423
1424         /* execute the queued request in the same thread */
1425         if( new_op ) {
1426                 rc = (long)connection_operation( ctx, new_op );
1427         }
1428
1429         return (void*)(long)rc;
1430 }
1431
1432 int connection_read_activate( ber_socket_t s )
1433 {
1434         int rc;
1435
1436         /*
1437          * suspend reading on this file descriptor until a connection processing
1438          * thread reads data on it. Otherwise the listener thread will repeatedly
1439          * submit the same event on it to the pool.
1440          */
1441         rc = slapd_clr_read( s, 0 );
1442         if ( rc )
1443                 return rc;
1444
1445         rc = ldap_pvt_thread_pool_submit( &connection_pool,
1446                 connection_read_thread, (void *)(long)s );
1447
1448         if( rc != 0 ) {
1449                 Debug( LDAP_DEBUG_ANY,
1450                         "connection_read_activiate(%d): submit failed (%d)\n",
1451                         s, rc, 0 );
1452         }
1453
1454         return rc;
1455 }
1456 #endif
1457
1458 #ifdef SLAP_LIGHTWEIGHT_DISPATCHER
1459 static int
1460 connection_read( ber_socket_t s, Operation** op )
1461 #else
1462 int connection_read(ber_socket_t s)
1463 #endif
1464 {
1465         int rc = 0;
1466         Connection *c;
1467
1468         assert( connections != NULL );
1469
1470         ldap_pvt_thread_mutex_lock( MCA_GET_CONN_MUTEX(s) );
1471
1472         /* get (locked) connection */
1473         c = connection_get( s );
1474
1475         if( c == NULL ) {
1476                 Debug( LDAP_DEBUG_ANY,
1477                         "connection_read(%ld): no connection!\n",
1478                         (long) s, 0, 0 );
1479
1480                 ldap_pvt_thread_mutex_unlock( MCA_GET_CONN_MUTEX(s) );
1481                 return -1;
1482         }
1483
1484         c->c_n_read++;
1485
1486         if( c->c_conn_state == SLAP_C_CLOSING ) {
1487                 Debug( LDAP_DEBUG_TRACE,
1488                         "connection_read(%d): closing, ignoring input for id=%lu\n",
1489                         s, c->c_connid, 0 );
1490
1491 #ifdef SLAP_LIGHTWEIGHT_DISPATCHER
1492                 slapd_set_read( s, 1 );
1493 #endif
1494                 connection_return( c );
1495                 ldap_pvt_thread_mutex_unlock( MCA_GET_CONN_MUTEX(s) );
1496                 return 0;
1497         }
1498
1499         if ( c->c_conn_state == SLAP_C_CLIENT ) {
1500 #ifdef SLAP_LIGHTWEIGHT_DISPATCHER
1501                 /* read should already be cleared */
1502 #else
1503                 slapd_clr_read( s, 0 );
1504 #endif
1505                 ldap_pvt_thread_pool_submit( &connection_pool,
1506                         c->c_clientfunc, c->c_clientarg );
1507
1508                 connection_return( c );
1509                 ldap_pvt_thread_mutex_unlock( MCA_GET_CONN_MUTEX(s) );
1510                 return 0;
1511         }
1512
1513         Debug( LDAP_DEBUG_TRACE,
1514                 "connection_read(%d): checking for input on id=%lu\n",
1515                 s, c->c_connid, 0 );
1516
1517 #ifdef HAVE_TLS
1518         if ( c->c_is_tls && c->c_needs_tls_accept ) {
1519                 rc = ldap_pvt_tls_accept( c->c_sb, slap_tls_ctx );
1520                 if ( rc < 0 ) {
1521                         Debug( LDAP_DEBUG_TRACE,
1522                                 "connection_read(%d): TLS accept failure "
1523                                 "error=%d id=%lu, closing\n",
1524                                 s, rc, c->c_connid );
1525
1526                         c->c_needs_tls_accept = 0;
1527                         /* connections_mutex and c_mutex are locked */
1528                         connection_closing( c, "TLS negotiation failure" );
1529
1530 #if 0
1531                         {
1532                                 struct timeval tv;
1533                                 fd_set rfd;
1534                                 /* Drain input before close, to allow SSL error codes
1535                                  * to propagate to client. */
1536                                 FD_ZERO(&rfd);
1537                                 FD_SET(s, &rfd);
1538                                 for (rc=1; rc>0;) {
1539                                         tv.tv_sec = 1;
1540                                         tv.tv_usec = 0;
1541                                         rc = select(s+1, &rfd, NULL, NULL, &tv);
1542                                         if (rc == 1) {
1543                                                 ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_DRAIN, NULL);
1544                                         }
1545                                 }
1546                         }
1547 #endif
1548
1549                         connection_close( c );
1550                         connection_return( c );
1551                         ldap_pvt_thread_mutex_unlock( MCA_GET_CONN_MUTEX(s) );
1552                         return 0;
1553
1554                 } else if ( rc == 0 ) {
1555                         void *ssl;
1556                         struct berval authid = BER_BVNULL;
1557
1558                         c->c_needs_tls_accept = 0;
1559
1560                         /* we need to let SASL know */
1561                         ssl = ldap_pvt_tls_sb_ctx( c->c_sb );
1562
1563                         c->c_tls_ssf = (slap_ssf_t) ldap_pvt_tls_get_strength( ssl );
1564                         if( c->c_tls_ssf > c->c_ssf ) {
1565                                 c->c_ssf = c->c_tls_ssf;
1566                         }
1567
1568                         rc = dnX509peerNormalize( ssl, &authid );
1569                         if ( rc != LDAP_SUCCESS ) {
1570                                 Debug( LDAP_DEBUG_TRACE, "connection_read(%d): "
1571                                         "unable to get TLS client DN, error=%d id=%lu\n",
1572                                         s, rc, c->c_connid );
1573                         }
1574                         Statslog( LDAP_DEBUG_STATS,
1575                                 "conn=%lu fd=%d TLS established tls_ssf=%u ssf=%u\n",
1576                             c->c_connid, (int) s, c->c_tls_ssf, c->c_ssf, 0 );
1577                         slap_sasl_external( c, c->c_tls_ssf, &authid );
1578                         if ( authid.bv_val ) free( authid.bv_val );
1579                 }
1580
1581                 /* if success and data is ready, fall thru to data input loop */
1582                 if( rc != 0 ||
1583                         !ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_DATA_READY, NULL ) )
1584                 {
1585 #ifdef SLAP_LIGHTWEIGHT_DISPATCHER
1586                         slapd_set_read( s, 1 );
1587 #endif
1588
1589                         connection_return( c );
1590                         ldap_pvt_thread_mutex_unlock( MCA_GET_CONN_MUTEX(s) );
1591                         return 0;
1592                 }
1593         }
1594 #endif
1595
1596 #ifdef HAVE_CYRUS_SASL
1597         if ( c->c_sasl_layers ) {
1598                 /* If previous layer is not removed yet, give up for now */
1599                 if ( !c->c_sasl_sockctx ) {
1600 #ifdef SLAP_LIGHTWEIGHT_DISPATCHER
1601                         slapd_set_read( s, 1 );
1602 #endif
1603
1604                         connection_return( c );
1605                         ldap_pvt_thread_mutex_unlock( MCA_GET_CONN_MUTEX(s) );
1606                         return 0;
1607                 }
1608
1609                 c->c_sasl_layers = 0;
1610
1611                 rc = ldap_pvt_sasl_install( c->c_sb, c->c_sasl_sockctx );
1612                 if( rc != LDAP_SUCCESS ) {
1613                         Debug( LDAP_DEBUG_TRACE,
1614                                 "connection_read(%d): SASL install error "
1615                                 "error=%d id=%lu, closing\n",
1616                                 s, rc, c->c_connid );
1617
1618                         /* connections_mutex and c_mutex are locked */
1619                         connection_closing( c, "SASL layer install failure" );
1620                         connection_close( c );
1621                         connection_return( c );
1622                         ldap_pvt_thread_mutex_unlock( MCA_GET_CONN_MUTEX(s) );
1623                         return 0;
1624                 }
1625         }
1626 #endif
1627
1628 #define CONNECTION_INPUT_LOOP 1
1629 /* #define      DATA_READY_LOOP 1 */
1630
1631         do {
1632                 /* How do we do this without getting into a busy loop ? */
1633 #ifdef SLAP_LIGHTWEIGHT_DISPATCHER
1634                 rc = connection_input( c, op );
1635 #else
1636                 rc = connection_input( c );
1637 #endif
1638         }
1639 #ifdef DATA_READY_LOOP
1640         while( !rc && ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_DATA_READY, NULL ));
1641 #elif CONNECTION_INPUT_LOOP
1642         while(!rc);
1643 #else
1644         while(0);
1645 #endif
1646
1647         if( rc < 0 ) {
1648                 Debug( LDAP_DEBUG_TRACE,
1649                         "connection_read(%d): input error=%d id=%lu, closing.\n",
1650                         s, rc, c->c_connid );
1651
1652                 /* connections_mutex and c_mutex are locked */
1653                 connection_closing( c, conn_lost_str );
1654                 connection_close( c );
1655                 connection_return( c );
1656                 ldap_pvt_thread_mutex_unlock( MCA_GET_CONN_MUTEX(s) );
1657                 return 0;
1658         }
1659
1660 #ifdef SLAP_LIGHTWEIGHT_DISPATCHER
1661         if ( ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_NEEDS_WRITE, NULL ) ) {
1662                 slapd_set_write( s, 0 );
1663         }
1664
1665         slapd_set_read( s, 1 );
1666 #else
1667         if ( ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_NEEDS_READ, NULL ) ) {
1668                 slapd_set_read( s, 1 );
1669         }
1670
1671         if ( ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_NEEDS_WRITE, NULL ) ) {
1672                 slapd_set_write( s, 1 );
1673         }
1674 #endif
1675
1676         connection_return( c );
1677         ldap_pvt_thread_mutex_unlock( MCA_GET_CONN_MUTEX(s) );
1678
1679         return 0;
1680 }
1681
1682 static int
1683 #ifdef SLAP_LIGHTWEIGHT_DISPATCHER
1684 connection_input( Connection *conn , Operation** c_op )
1685 #else
1686 connection_input( Connection *conn )
1687 #endif
1688 {
1689         Operation *op;
1690         ber_tag_t       tag;
1691         ber_len_t       len;
1692         ber_int_t       msgid;
1693         BerElement      *ber;
1694         int             rc;
1695 #ifdef LDAP_CONNECTIONLESS
1696         Sockaddr        peeraddr;
1697         char            *cdn = NULL;
1698 #endif
1699         char *defer = NULL;
1700
1701         if ( conn->c_currentber == NULL &&
1702                 ( conn->c_currentber = ber_alloc()) == NULL )
1703         {
1704                 Debug( LDAP_DEBUG_ANY, "ber_alloc failed\n", 0, 0, 0 );
1705                 return -1;
1706         }
1707
1708         errno = 0;
1709
1710 #ifdef LDAP_CONNECTIONLESS
1711         if ( conn->c_is_udp ) {
1712                 char peername[sizeof("IP=255.255.255.255:65336")];
1713
1714                 len = ber_int_sb_read(conn->c_sb, &peeraddr, sizeof(struct sockaddr));
1715                 if (len != sizeof(struct sockaddr)) return 1;
1716
1717                 sprintf( peername, "IP=%s:%d",
1718                         inet_ntoa( peeraddr.sa_in_addr.sin_addr ),
1719                         (unsigned) ntohs( peeraddr.sa_in_addr.sin_port ) );
1720                 Statslog( LDAP_DEBUG_STATS,
1721                         "conn=%lu UDP request from %s (%s) accepted.\n",
1722                         conn->c_connid, peername, conn->c_sock_name.bv_val, 0, 0 );
1723         }
1724 #endif
1725
1726         tag = ber_get_next( conn->c_sb, &len, conn->c_currentber );
1727         if ( tag != LDAP_TAG_MESSAGE ) {
1728                 int err = errno;
1729                 ber_socket_t    sd;
1730
1731                 ber_sockbuf_ctrl( conn->c_sb, LBER_SB_OPT_GET_FD, &sd );
1732
1733                 Debug( LDAP_DEBUG_TRACE,
1734                         "ber_get_next on fd %d failed errno=%d (%s)\n",
1735                         sd, err, sock_errstr(err) );
1736                 if ( err != EWOULDBLOCK && err != EAGAIN ) {
1737                         /* log, close and send error */
1738                         ber_free( conn->c_currentber, 1 );
1739                         conn->c_currentber = NULL;
1740
1741                         return -2;
1742                 }
1743                 return 1;
1744         }
1745
1746         ber = conn->c_currentber;
1747         conn->c_currentber = NULL;
1748
1749         if ( (tag = ber_get_int( ber, &msgid )) != LDAP_TAG_MSGID ) {
1750                 /* log, close and send error */
1751                 Debug( LDAP_DEBUG_ANY, "ber_get_int returns 0x%lx\n", tag, 0, 0 );
1752                 ber_free( ber, 1 );
1753                 return -1;
1754         }
1755
1756         if ( (tag = ber_peek_tag( ber, &len )) == LBER_ERROR ) {
1757                 /* log, close and send error */
1758                 Debug( LDAP_DEBUG_ANY, "ber_peek_tag returns 0x%lx\n", tag, 0, 0 );
1759                 ber_free( ber, 1 );
1760
1761                 return -1;
1762         }
1763
1764 #ifdef LDAP_CONNECTIONLESS
1765         if( conn->c_is_udp ) {
1766                 if( tag == LBER_OCTETSTRING ) {
1767                         ber_get_stringa( ber, &cdn );
1768                         tag = ber_peek_tag(ber, &len);
1769                 }
1770                 if( tag != LDAP_REQ_ABANDON && tag != LDAP_REQ_SEARCH ) {
1771                         Debug( LDAP_DEBUG_ANY, "invalid req for UDP 0x%lx\n", tag, 0, 0 );
1772                         ber_free( ber, 1 );
1773                         return 0;
1774                 }
1775         }
1776 #endif
1777
1778         if(tag == LDAP_REQ_BIND) {
1779                 /* immediately abandon all existing operations upon BIND */
1780                 connection_abandon( conn );
1781         }
1782
1783         op = slap_op_alloc( ber, msgid, tag, conn->c_n_ops_received++ );
1784
1785         op->o_conn = conn;
1786         /* clear state if the connection is being reused from inactive */
1787         if ( conn->c_conn_state == SLAP_C_INACTIVE ) {
1788                 memset( &conn->c_pagedresults_state, 0,
1789                         sizeof( conn->c_pagedresults_state ) );
1790         }
1791
1792         op->o_res_ber = NULL;
1793
1794 #ifdef LDAP_CONNECTIONLESS
1795         if (conn->c_is_udp) {
1796                 if ( cdn ) {
1797                         ber_str2bv( cdn, 0, 1, &op->o_dn );
1798                         op->o_protocol = LDAP_VERSION2;
1799                 }
1800                 op->o_res_ber = ber_alloc_t( LBER_USE_DER );
1801                 if (op->o_res_ber == NULL) return 1;
1802
1803                 rc = ber_write( op->o_res_ber, (char *)&peeraddr,
1804                         sizeof(struct sockaddr), 0 );
1805
1806                 if (rc != sizeof(struct sockaddr)) {
1807                         Debug( LDAP_DEBUG_ANY, "ber_write failed\n", 0, 0, 0 );
1808                         return 1;
1809                 }
1810
1811                 if (op->o_protocol == LDAP_VERSION2) {
1812                         rc = ber_printf(op->o_res_ber, "{is{" /*}}*/, op->o_msgid, "");
1813                         if (rc == -1) {
1814                                 Debug( LDAP_DEBUG_ANY, "ber_write failed\n", 0, 0, 0 );
1815                                 return rc;
1816                         }
1817                 }
1818         }
1819 #endif /* LDAP_CONNECTIONLESS */
1820
1821         rc = 0;
1822
1823         /* Don't process requests when the conn is in the middle of a
1824          * Bind, or if it's closing. Also, don't let any single conn
1825          * use up all the available threads, and don't execute if we're
1826          * currently blocked on output. And don't execute if there are
1827          * already pending ops, let them go first.  Abandon operations
1828          * get exceptions to some, but not all, cases.
1829          */
1830         switch( tag ){
1831         default:
1832                 /* Abandon and Unbind are exempt from these checks */
1833                 if (conn->c_conn_state == SLAP_C_CLOSING) {
1834                         defer = "closing";
1835                         break;
1836                 } else if (conn->c_writewaiter) {
1837                         defer = "awaiting write";
1838                         break;
1839                 } else if (conn->c_n_ops_pending) {
1840                         defer = "pending operations";
1841                         break;
1842                 }
1843                 /* FALLTHRU */
1844         case LDAP_REQ_ABANDON:
1845                 /* Unbind is exempt from these checks */
1846                 if (conn->c_n_ops_executing >= connection_pool_max/2) {
1847                         defer = "too many executing";
1848                         break;
1849                 } else if (conn->c_conn_state == SLAP_C_BINDING) {
1850                         defer = "binding";
1851                         break;
1852                 }
1853                 /* FALLTHRU */
1854         case LDAP_REQ_UNBIND:
1855                 break;
1856         }
1857
1858         if( defer ) {
1859                 int max = conn->c_dn.bv_len
1860                         ? slap_conn_max_pending_auth
1861                         : slap_conn_max_pending;
1862
1863                 Debug( LDAP_DEBUG_ANY,
1864                         "connection_input: conn=%lu deferring operation: %s\n",
1865                         conn->c_connid, defer, 0 );
1866                 conn->c_n_ops_pending++;
1867                 LDAP_STAILQ_INSERT_TAIL( &conn->c_pending_ops, op, o_next );
1868                 rc = ( conn->c_n_ops_pending > max ) ? -1 : 0;
1869
1870         } else {
1871                 conn->c_n_ops_executing++;
1872
1873 #if 0
1874                 /*
1875                  * The first op will be processed in the same thread context,
1876                  * Subsequent ops will be submitted to the pool by
1877                  * calling connection_op_activate()
1878                  */
1879                 if ( *c_op == NULL ) {
1880                         /* the first incoming request */
1881                         connection_op_queue( op );
1882                         *c_op = op;
1883                 } else
1884 #endif
1885                 {
1886                         connection_op_activate( op );
1887                 }
1888         }
1889
1890 #ifdef NO_THREADS
1891         if ( conn->c_struct_state != SLAP_C_USED ) {
1892                 /* connection must have got closed underneath us */
1893                 return 1;
1894         }
1895 #endif
1896
1897         assert( conn->c_struct_state == SLAP_C_USED );
1898         return rc;
1899 }
1900
1901 static int
1902 connection_resched( Connection *conn )
1903 {
1904         Operation *op;
1905
1906         if( conn->c_conn_state == SLAP_C_CLOSING ) {
1907                 int rc;
1908                 ber_socket_t    sd;
1909                 ber_sockbuf_ctrl( conn->c_sb, LBER_SB_OPT_GET_FD, &sd );
1910
1911                 /* use trylock to avoid possible deadlock */
1912                 rc = ldap_pvt_thread_mutex_trylock( MCA_GET_CONN_MUTEX( sd ) );
1913
1914                 if( rc ) {
1915                         Debug( LDAP_DEBUG_TRACE,
1916                                 "connection_resched: reaquiring locks conn=%lu sd=%d\n",
1917                                 conn->c_connid, sd, 0 );
1918                         /*
1919                          * reaquire locks in the right order...
1920                          * this may allow another thread to close this connection,
1921                          * so recheck state below.
1922                          */
1923                         ldap_pvt_thread_mutex_unlock( &conn->c_mutex );
1924                         ldap_pvt_thread_mutex_lock( MCA_GET_CONN_MUTEX ( sd ) );
1925                         ldap_pvt_thread_mutex_lock( &conn->c_mutex );
1926                 }
1927
1928                 if( conn->c_conn_state != SLAP_C_CLOSING ) {
1929                         Debug( LDAP_DEBUG_TRACE, "connection_resched: "
1930                                 "closed by other thread conn=%lu sd=%d\n",
1931                                 conn->c_connid, sd, 0 );
1932                 } else {
1933                         Debug( LDAP_DEBUG_TRACE, "connection_resched: "
1934                                 "attempting closing conn=%lu sd=%d\n",
1935                                 conn->c_connid, sd, 0 );
1936                         connection_close( conn );
1937                 }
1938
1939                 ldap_pvt_thread_mutex_unlock( MCA_GET_CONN_MUTEX( sd ) );
1940                 return 0;
1941         }
1942
1943         if( conn->c_conn_state != SLAP_C_ACTIVE || conn->c_writewaiter ) {
1944                 /* other states need different handling */
1945                 return 0;
1946         }
1947
1948         while ((op = LDAP_STAILQ_FIRST( &conn->c_pending_ops )) != NULL) {
1949                 if ( conn->c_n_ops_executing > connection_pool_max/2 ) break;
1950
1951                 LDAP_STAILQ_REMOVE_HEAD( &conn->c_pending_ops, o_next );
1952                 LDAP_STAILQ_NEXT(op, o_next) = NULL;
1953
1954                 /* pending operations should not be marked for abandonment */
1955                 assert(!op->o_abandon);
1956
1957                 conn->c_n_ops_pending--;
1958                 conn->c_n_ops_executing++;
1959
1960                 connection_op_activate( op );
1961
1962                 if ( conn->c_conn_state == SLAP_C_BINDING ) break;
1963         }
1964         return 0;
1965 }
1966
1967 static void
1968 connection_init_log_prefix( Operation *op )
1969 {
1970         if ( op->o_connid == (unsigned long)(-1) ) {
1971                 snprintf( op->o_log_prefix, sizeof( op->o_log_prefix ),
1972                         "conn=-1 op=%lu", op->o_opid );
1973
1974         } else {
1975                 snprintf( op->o_log_prefix, sizeof( op->o_log_prefix ),
1976                         "conn=%lu op=%lu", op->o_connid, op->o_opid );
1977         }
1978 }
1979
1980 static void connection_op_queue( Operation *op )
1981 {
1982         int status;
1983         ber_tag_t tag = op->o_tag;
1984
1985         if (tag == LDAP_REQ_BIND) {
1986                 op->o_conn->c_conn_state = SLAP_C_BINDING;
1987         }
1988
1989         if (!op->o_dn.bv_len) {
1990                 op->o_authz = op->o_conn->c_authz;
1991                 if ( BER_BVISNULL( &op->o_conn->c_sasl_authz_dn )) {
1992                         ber_dupbv( &op->o_dn, &op->o_conn->c_dn );
1993                         ber_dupbv( &op->o_ndn, &op->o_conn->c_ndn );
1994                 } else {
1995                         ber_dupbv( &op->o_dn, &op->o_conn->c_sasl_authz_dn );
1996                         ber_dupbv( &op->o_ndn, &op->o_conn->c_sasl_authz_dn );
1997                 }
1998         }
1999
2000         op->o_authtype = op->o_conn->c_authtype;
2001         ber_dupbv( &op->o_authmech, &op->o_conn->c_authmech );
2002
2003         if (!op->o_protocol) {
2004                 op->o_protocol = op->o_conn->c_protocol
2005                         ? op->o_conn->c_protocol : LDAP_VERSION3;
2006         }
2007
2008         if (op->o_conn->c_conn_state == SLAP_C_INACTIVE &&
2009                 op->o_protocol > LDAP_VERSION2)
2010         {
2011                 op->o_conn->c_conn_state = SLAP_C_ACTIVE;
2012         }
2013
2014         op->o_connid = op->o_conn->c_connid;
2015         connection_init_log_prefix( op );
2016
2017         LDAP_STAILQ_INSERT_TAIL( &op->o_conn->c_ops, op, o_next );
2018 }
2019
2020 static int connection_op_activate( Operation *op )
2021 {
2022         int rc;
2023         ber_tag_t tag = op->o_tag;
2024
2025         connection_op_queue( op );
2026
2027         rc = ldap_pvt_thread_pool_submit( &connection_pool,
2028                 connection_operation, (void *) op );
2029
2030         if ( rc != 0 ) {
2031                 Debug( LDAP_DEBUG_ANY,
2032                         "connection_op_activate: submit failed (%d) for conn=%lu\n",
2033                         rc, op->o_connid, 0 );
2034                 /* should move op to pending list */
2035         }
2036
2037         return rc;
2038 }
2039
2040 #ifdef SLAP_LIGHTWEIGHT_DISPATCHER
2041 static int connection_write( ber_socket_t s );
2042 static void *connection_write_thread( void *ctx, void *arg )
2043 {
2044         return (void *)(long)connection_write((long)arg);
2045 }
2046
2047 int connection_write_activate( ber_socket_t s )
2048 {
2049         int rc;
2050
2051         /*
2052          * suspend reading on this file descriptor until a connection processing
2053          * thread write data on it. Otherwise the listener thread will repeatedly
2054          * submit the same event on it to the pool.
2055          */
2056         slapd_clr_write( s, 0);
2057
2058         rc = ldap_pvt_thread_pool_submit( &connection_pool,
2059                 connection_write_thread, (void *)(long)s );
2060
2061         if( rc != 0 ) {
2062                 Debug( LDAP_DEBUG_ANY,
2063                         "connection_write_activate(%d): submit failed (%d)\n",
2064                         (int) s, rc, 0 );
2065         }
2066         return rc;
2067 }
2068
2069 static
2070 #endif
2071 int connection_write(ber_socket_t s)
2072 {
2073         Connection *c;
2074         Operation *op;
2075
2076         assert( connections != NULL );
2077
2078         ldap_pvt_thread_mutex_lock( MCA_GET_CONN_MUTEX( s ) );
2079
2080         c = connection_get( s );
2081         if( c == NULL ) {
2082                 Debug( LDAP_DEBUG_ANY,
2083                         "connection_write(%ld): no connection!\n",
2084                         (long)s, 0, 0 );
2085                 ldap_pvt_thread_mutex_unlock( MCA_GET_CONN_MUTEX( s ) );
2086                 return -1;
2087         }
2088
2089 #ifndef SLAP_LIGHTWEIGHT_DISPATCHER
2090         slapd_clr_write( s, 0);
2091 #endif
2092         c->c_n_write++;
2093
2094         Debug( LDAP_DEBUG_TRACE,
2095                 "connection_write(%d): waking output for id=%lu\n",
2096                 s, c->c_connid, 0 );
2097         ldap_pvt_thread_cond_signal( &c->c_write_cv );
2098
2099         if ( ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_NEEDS_READ, NULL ) ) {
2100                 slapd_set_read( s, 1 );
2101         }
2102         if ( ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_NEEDS_WRITE, NULL ) ) {
2103                 slapd_set_write( s, 1 );
2104         }
2105
2106         /* If there are ops pending because of a writewaiter,
2107          * start one up.
2108          */
2109         while ((op = LDAP_STAILQ_FIRST( &c->c_pending_ops )) != NULL) {
2110                 if ( !c->c_writewaiter ) break;
2111                 if ( c->c_n_ops_executing > connection_pool_max/2 ) break;
2112
2113                 LDAP_STAILQ_REMOVE_HEAD( &c->c_pending_ops, o_next );
2114                 LDAP_STAILQ_NEXT(op, o_next) = NULL;
2115
2116                 /* pending operations should not be marked for abandonment */
2117                 assert(!op->o_abandon);
2118
2119                 c->c_n_ops_pending--;
2120                 c->c_n_ops_executing++;
2121
2122                 connection_op_activate( op );
2123
2124                 break;
2125         }
2126
2127         connection_return( c );
2128         ldap_pvt_thread_mutex_unlock( MCA_GET_CONN_MUTEX(s) );
2129         return 0;
2130 }
2131
2132 void
2133 connection_fake_init(
2134         Connection *conn,
2135         Operation *op,
2136         void *ctx )
2137 {
2138         conn->c_connid = -1;
2139         conn->c_send_ldap_result = slap_send_ldap_result;
2140         conn->c_send_search_entry = slap_send_search_entry;
2141         conn->c_send_search_reference = slap_send_search_reference;
2142         conn->c_listener = (Listener *)&dummy_list;
2143         conn->c_peer_domain = slap_empty_bv;
2144         conn->c_peer_name = slap_empty_bv;
2145
2146         memset(op, 0, OPERATION_BUFFER_SIZE);
2147         op->o_hdr = (Opheader *)(op+1);
2148         op->o_controls = (void **)(op->o_hdr+1);
2149         /* set memory context */
2150         op->o_tmpmemctx = slap_sl_mem_create(SLAP_SLAB_SIZE, SLAP_SLAB_STACK, ctx);
2151         op->o_tmpmfuncs = &slap_sl_mfuncs;
2152         op->o_threadctx = ctx;
2153
2154         op->o_conn = conn;
2155         op->o_connid = op->o_conn->c_connid;
2156         connection_init_log_prefix( op );
2157
2158         slap_op_time( &op->o_time, &op->o_tincr );
2159 }
2160
2161 void
2162 connection_assign_nextid( Connection *conn )
2163 {
2164         ldap_pvt_thread_mutex_lock( &conn_nextid_mutex );
2165         conn->c_connid = conn_nextid++;
2166         ldap_pvt_thread_mutex_unlock( &conn_nextid_mutex );
2167 }