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         slapd_add_internal( s, 1 );
 755         ldap_pvt_thread_mutex_unlock( &c->c_mutex );
 756         ldap_pvt_thread_mutex_unlock( MCA_GET_CONN_MUTEX(s) );
 757
 758         backend_connection_init(c);
 759
 760         return id;
 761 }
 762
 763 void connection2anonymous( Connection *c )
 764 {
 765         assert( connections != NULL );
 766         assert( c != NULL );
 767
 768         {
 769                 ber_len_t max = sockbuf_max_incoming;
 770                 ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_SET_MAX_INCOMING, &max );
 771         }
 772
 773         if ( !BER_BVISNULL( &c->c_authmech ) ) {
 774                 ch_free(c->c_authmech.bv_val);
 775         }
 776         BER_BVZERO( &c->c_authmech );
 777
 778         if ( !BER_BVISNULL( &c->c_dn ) ) {
 779                 ch_free(c->c_dn.bv_val);
 780         }
 781         BER_BVZERO( &c->c_dn );
 782
 783         if ( !BER_BVISNULL( &c->c_ndn ) ) {
 784                 ch_free(c->c_ndn.bv_val);
 785         }
 786         BER_BVZERO( &c->c_ndn );
 787
 788         if ( !BER_BVISNULL( &c->c_sasl_authz_dn ) ) {
 789                 ber_memfree_x( c->c_sasl_authz_dn.bv_val, NULL );
 790         }
 791         BER_BVZERO( &c->c_sasl_authz_dn );
 792
 793         c->c_authz_backend = NULL;
 794 }
 795
 796 static void
 797 connection_destroy( Connection *c )
 798 {
 799         /* note: connections_mutex should be locked by caller */
 800         ber_socket_t    sd;
 801         unsigned long   connid;
 802         const char              *close_reason;
 803
 804         assert( connections != NULL );
 805         assert( c != NULL );
 806         assert( c->c_struct_state != SLAP_C_UNUSED );
 807         assert( c->c_conn_state != SLAP_C_INVALID );
 808         assert( LDAP_STAILQ_EMPTY(&c->c_ops) );
 809         assert( c->c_writewaiter == 0);
 810
 811         /* only for stats (print -1 as "%lu" may give unexpected results ;) */
 812         connid = c->c_connid;
 813         close_reason = c->c_close_reason;
 814
 815         backend_connection_destroy(c);
 816
 817         c->c_protocol = 0;
 818         c->c_connid = -1;
 819
 820         c->c_activitytime = c->c_starttime = 0;
 821
 822         connection2anonymous( c );
 823         c->c_listener = NULL;
 824
 825         if(c->c_peer_domain.bv_val != NULL) {
 826                 free(c->c_peer_domain.bv_val);
 827         }
 828         BER_BVZERO( &c->c_peer_domain );
 829         if(c->c_peer_name.bv_val != NULL) {
 830                 free(c->c_peer_name.bv_val);
 831         }
 832         BER_BVZERO( &c->c_peer_name );
 833
 834         c->c_sasl_bind_in_progress = 0;
 835         if(c->c_sasl_bind_mech.bv_val != NULL) {
 836                 free(c->c_sasl_bind_mech.bv_val);
 837         }
 838         BER_BVZERO( &c->c_sasl_bind_mech );
 839
 840         slap_sasl_close( c );
 841
 842         if ( c->c_currentber != NULL ) {
 843                 ber_free( c->c_currentber, 1 );
 844                 c->c_currentber = NULL;
 845         }
 846
 847         ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_GET_FD, &sd );
 848         slapd_sd_lock();
 849         ber_sockbuf_free( c->c_sb );
 850         if ( sd != AC_SOCKET_INVALID ) {
 851                 slapd_remove( sd, 1, 0, 1 );
 852
 853                 Statslog( LDAP_DEBUG_STATS, (close_reason
 854                                                                          ? "conn=%lu fd=%ld closed (%s)\n"
 855                                                                          : "conn=%lu fd=%ld closed\n"),
 856                         connid, (long) sd, close_reason, 0, 0 );
 857         } else {
 858                 slapd_sd_unlock();
 859         }
 860
 861         c->c_sb = ber_sockbuf_alloc( );
 862
 863         {
 864                 ber_len_t max = sockbuf_max_incoming;
 865                 ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_SET_MAX_INCOMING, &max );
 866         }
 867
 868         c->c_conn_state = SLAP_C_INVALID;
 869         c->c_struct_state = SLAP_C_UNUSED;
 870         c->c_close_reason = "?";                        /* should never be needed */
 871
 872 #ifdef LDAP_SLAPI
 873         /* call destructors, then constructors; avoids unnecessary allocation */
 874         if ( slapi_plugins_used ) {
 875                 slapi_int_clear_object_extensions( SLAPI_X_EXT_CONNECTION, c );
 876         }
 877 #endif
 878 }
 879
 880 int connection_state_closing( Connection *c )
 881 {
 882         /* c_mutex must be locked by caller */
 883
 884         int state;
 885         assert( c != NULL );
 886         assert( c->c_struct_state == SLAP_C_USED );
 887
 888         state = c->c_conn_state;
 889
 890         assert( state != SLAP_C_INVALID );
 891
 892         return state == SLAP_C_CLOSING;
 893 }
 894
 895 static void connection_abandon( Connection *c )
 896 {
 897         /* c_mutex must be locked by caller */
 898
 899         Operation *o, *next, op = {0};
 900         Opheader ohdr = {0};
 901         SlapReply rs = {0};
 902
 903         op.o_hdr = &ohdr;
 904         op.o_conn = c;
 905         op.o_connid = c->c_connid;
 906         op.o_tag = LDAP_REQ_ABANDON;
 907         for ( o = LDAP_STAILQ_FIRST( &c->c_ops ); o; o=next ) {
 908                 next = LDAP_STAILQ_NEXT( o, o_next );
 909                 op.orn_msgid = o->o_msgid;
 910                 o->o_abandon = 1;
 911                 op.o_bd = frontendDB;
 912                 frontendDB->be_abandon( &op, &rs );
 913         }
 914
 915         /* remove pending operations */
 916         while ( (o = LDAP_STAILQ_FIRST( &c->c_pending_ops )) != NULL) {
 917                 LDAP_STAILQ_REMOVE_HEAD( &c->c_pending_ops, o_next );
 918                 LDAP_STAILQ_NEXT(o, o_next) = NULL;
 919                 slap_op_free( o );
 920         }
 921 }
 922
 923 void connection_closing( Connection *c, const char *why )
 924 {
 925         assert( connections != NULL );
 926         assert( c != NULL );
 927         assert( c->c_struct_state == SLAP_C_USED );
 928         assert( c->c_conn_state != SLAP_C_INVALID );
 929
 930         /* c_mutex must be locked by caller */
 931
 932         if( c->c_conn_state != SLAP_C_CLOSING ) {
 933                 ber_socket_t    sd;
 934
 935                 ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_GET_FD, &sd );
 936                 Debug( LDAP_DEBUG_TRACE,
 937                         "connection_closing: readying conn=%lu sd=%d for close\n",
 938                         c->c_connid, sd, 0 );
 939                 /* update state to closing */
 940                 c->c_conn_state = SLAP_C_CLOSING;
 941                 c->c_close_reason = why;
 942
 943                 /* don't listen on this port anymore */
 944                 slapd_clr_read( sd, 1 );
 945
 946                 /* abandon active operations */
 947                 connection_abandon( c );
 948
 949                 /* wake write blocked operations */
 950                 slapd_clr_write( sd, 1 );
 951                 if ( c->c_writewaiter ) {
 952                         ldap_pvt_thread_cond_signal( &c->c_write_cv );
 953                         ldap_pvt_thread_mutex_unlock( &c->c_mutex );
 954                         ldap_pvt_thread_yield();
 955                         ldap_pvt_thread_mutex_lock( &c->c_mutex );
 956                 }
 957         } else if( why == NULL && c->c_close_reason == conn_lost_str ) {
 958                 /* Client closed connection after doing Unbind. */
 959                 c->c_close_reason = NULL;
 960         }
 961 }
 962
 963 static void connection_close( Connection *c )
 964 {
 965         ber_socket_t    sd;
 966
 967         assert( connections != NULL );
 968         assert( c != NULL );
 969         assert( c->c_struct_state == SLAP_C_USED );
 970         assert( c->c_conn_state == SLAP_C_CLOSING );
 971
 972         /* note: connections_mutex and c_mutex should be locked by caller */
 973
 974         ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_GET_FD, &sd );
 975         if( !LDAP_STAILQ_EMPTY(&c->c_ops) ) {
 976                 Debug( LDAP_DEBUG_TRACE,
 977                         "connection_close: deferring conn=%lu sd=%d\n",
 978                         c->c_connid, sd, 0 );
 979                 return;
 980         }
 981
 982         Debug( LDAP_DEBUG_TRACE, "connection_close: conn=%lu sd=%d\n",
 983                 c->c_connid, sd, 0 );
 984         connection_destroy( c );
 985 }
 986
 987 unsigned long connections_nextid(void)
 988 {
 989         unsigned long id;
 990         assert( connections != NULL );
 991
 992         ldap_pvt_thread_mutex_lock( &conn_nextid_mutex );
 993
 994         id = conn_nextid;
 995
 996         ldap_pvt_thread_mutex_unlock( &conn_nextid_mutex );
 997
 998         return id;
 999 }
1000
1001 Connection* connection_first( ber_socket_t *index )
1002 {
1003 #ifdef SLAP_MULTI_CONN_ARRAY
1004         int conn_array_id;
1005 #endif
1006
1007         assert( connections != NULL );
1008         assert( index != NULL );
1009
1010 #ifdef SLAP_MULTI_CONN_ARRAY
1011         for ( conn_array_id = 0;
1012                 conn_array_id < NUM_CONNECTION_ARRAY;
1013                 conn_array_id++ )
1014         {
1015                 ldap_pvt_thread_mutex_lock( &connections_mutex[ conn_array_id ] );
1016         }
1017 #else
1018         ldap_pvt_thread_mutex_lock( &connections_mutex );
1019 #endif
1020
1021         *index = 0;
1022
1023         return connection_next(NULL, index);
1024 }
1025
1026 Connection* connection_next( Connection *c, ber_socket_t *index )
1027 #ifdef SLAP_MULTI_CONN_ARRAY
1028 {
1029         Connection* conn;
1030
1031         assert( connections != NULL );
1032         assert( index != NULL );
1033         assert( *index <= (dtblsize/NUM_CONNECTION_ARRAY) );
1034
1035         if( c != NULL ) ldap_pvt_thread_mutex_unlock( &c->c_mutex );
1036
1037         c = NULL;
1038
1039         for(; *index < dtblsize; (*index)++) {
1040                 conn = MCA_GET_CONNECTION(*index);
1041                 if( conn->c_struct_state == SLAP_C_UNINITIALIZED ) {
1042                         assert( conn->c_conn_state == SLAP_C_INVALID );
1043 #ifndef HAVE_WINSOCK
1044                         continue;
1045 #else
1046                         break;
1047 #endif
1048                 }
1049
1050                 if( conn->c_struct_state == SLAP_C_USED ) {
1051                         assert( conn->c_conn_state != SLAP_C_INVALID );
1052                         c = conn;
1053                         (*index)++;
1054                         break;
1055                 }
1056
1057                 assert( conn->c_struct_state == SLAP_C_UNUSED );
1058                 assert( conn->c_conn_state == SLAP_C_INVALID );
1059         }
1060
1061         if( c != NULL ) ldap_pvt_thread_mutex_lock( &c->c_mutex );
1062
1063         return c;
1064
1065 }
1066 #else
1067 {
1068         assert( connections != NULL );
1069         assert( index != NULL );
1070         assert( *index <= dtblsize );
1071
1072         if( c != NULL ) ldap_pvt_thread_mutex_unlock( &c->c_mutex );
1073
1074         c = NULL;
1075
1076         for(; *index < dtblsize; (*index)++) {
1077                 if( connections[*index].c_struct_state == SLAP_C_UNINITIALIZED ) {
1078                         assert( connections[*index].c_conn_state == SLAP_C_INVALID );
1079 #ifndef HAVE_WINSOCK
1080                         continue;
1081 #else
1082                         break;
1083 #endif
1084                 }
1085
1086                 if( connections[*index].c_struct_state == SLAP_C_USED ) {
1087                         assert( connections[*index].c_conn_state != SLAP_C_INVALID );
1088                         c = &connections[(*index)++];
1089                         break;
1090                 }
1091
1092                 assert( connections[*index].c_struct_state == SLAP_C_UNUSED );
1093                 assert( connections[*index].c_conn_state == SLAP_C_INVALID );
1094         }
1095
1096         if( c != NULL ) ldap_pvt_thread_mutex_lock( &c->c_mutex );
1097         return c;
1098 }
1099 #endif
1100
1101 void connection_done( Connection *c )
1102 {
1103 #ifdef SLAP_MULTI_CONN_ARRAY
1104         int conn_array_id;
1105 #endif
1106
1107         assert( connections != NULL );
1108
1109         if( c != NULL ) ldap_pvt_thread_mutex_unlock( &c->c_mutex );
1110
1111 #ifdef SLAP_MULTI_CONN_ARRAY
1112         for ( conn_array_id = 0;
1113                 conn_array_id < NUM_CONNECTION_ARRAY;
1114                 conn_array_id++ )
1115         {
1116                 ldap_pvt_thread_mutex_unlock( &connections_mutex[ conn_array_id ] );
1117         }
1118 #else
1119         ldap_pvt_thread_mutex_unlock( &connections_mutex );
1120 #endif
1121 }
1122
1123 /*
1124  * connection_activity - handle the request operation op on connection
1125  * conn.  This routine figures out what kind of operation it is and
1126  * calls the appropriate stub to handle it.
1127  */
1128
1129 #ifdef SLAPD_MONITOR
1130 /* FIXME: returns 0 in case of failure */
1131 #define INCR_OP_INITIATED(index) \
1132         do { \
1133                 ldap_pvt_thread_mutex_lock( &slap_counters.sc_ops_mutex ); \
1134                 ldap_pvt_mp_add_ulong(slap_counters.sc_ops_initiated_[(index)], 1); \
1135                 ldap_pvt_thread_mutex_unlock( &slap_counters.sc_ops_mutex ); \
1136         } while (0)
1137 #define INCR_OP_COMPLETED(index) \
1138         do { \
1139                 ldap_pvt_thread_mutex_lock( &slap_counters.sc_ops_mutex ); \
1140                 ldap_pvt_mp_add_ulong(slap_counters.sc_ops_completed, 1); \
1141                 ldap_pvt_mp_add_ulong(slap_counters.sc_ops_completed_[(index)], 1); \
1142                 ldap_pvt_thread_mutex_unlock( &slap_counters.sc_ops_mutex ); \
1143         } while (0)
1144 #else /* !SLAPD_MONITOR */
1145 #define INCR_OP_INITIATED(index) do { } while (0)
1146 #define INCR_OP_COMPLETED(index) \
1147         do { \
1148                 ldap_pvt_thread_mutex_lock( &slap_counters.sc_ops_mutex ); \
1149                 ldap_pvt_mp_add_ulong(slap_counters.sc_ops_completed, 1); \
1150                 ldap_pvt_thread_mutex_unlock( &slap_counters.sc_ops_mutex ); \
1151         } while (0)
1152 #endif /* !SLAPD_MONITOR */
1153
1154 /*
1155  * NOTE: keep in sync with enum in slapd.h
1156  */
1157 static int (*opfun[])( Operation *op, SlapReply *rs ) = {
1158         do_bind,
1159         do_unbind,
1160         do_add,
1161         do_delete,
1162         do_modrdn,
1163         do_modify,
1164         do_compare,
1165         do_search,
1166         do_abandon,
1167         do_extended,
1168         NULL
1169 };
1170
1171 static void *
1172 connection_operation( void *ctx, void *arg_v )
1173 {
1174         int rc = LDAP_OTHER;
1175         Operation *op = arg_v;
1176         SlapReply rs = {REP_RESULT};
1177         ber_tag_t tag = op->o_tag;
1178         int opidx = -1;
1179         Connection *conn = op->o_conn;
1180         void *memctx = NULL;
1181         void *memctx_null = NULL;
1182         ber_len_t memsiz;
1183
1184         ldap_pvt_thread_mutex_lock( &slap_counters.sc_ops_mutex );
1185         /* FIXME: returns 0 in case of failure */
1186         ldap_pvt_mp_add_ulong(slap_counters.sc_ops_initiated, 1);
1187         ldap_pvt_thread_mutex_unlock( &slap_counters.sc_ops_mutex );
1188
1189         op->o_threadctx = ctx;
1190
1191         switch ( tag ) {
1192         case LDAP_REQ_BIND:
1193         case LDAP_REQ_UNBIND:
1194         case LDAP_REQ_ADD:
1195         case LDAP_REQ_DELETE:
1196         case LDAP_REQ_MODDN:
1197         case LDAP_REQ_MODIFY:
1198         case LDAP_REQ_COMPARE:
1199         case LDAP_REQ_SEARCH:
1200         case LDAP_REQ_ABANDON:
1201         case LDAP_REQ_EXTENDED:
1202                 break;
1203         default:
1204                 Debug( LDAP_DEBUG_ANY, "connection_operation: "
1205                         "conn %lu unknown LDAP request 0x%lx\n",
1206                         conn->c_connid, tag, 0 );
1207                 op->o_tag = LBER_ERROR;
1208                 rs.sr_err = LDAP_PROTOCOL_ERROR;
1209                 rs.sr_text = "unknown LDAP request";
1210                 send_ldap_disconnect( op, &rs );
1211                 rc = SLAPD_DISCONNECT;
1212                 goto operations_error;
1213         }
1214
1215         if( conn->c_sasl_bind_in_progress && tag != LDAP_REQ_BIND ) {
1216                 Debug( LDAP_DEBUG_ANY, "connection_operation: "
1217                         "error: SASL bind in progress (tag=%ld).\n",
1218                         (long) tag, 0, 0 );
1219                 send_ldap_error( op, &rs, LDAP_OPERATIONS_ERROR,
1220                         "SASL bind in progress" );
1221                 rc = LDAP_OPERATIONS_ERROR;
1222                 goto operations_error;
1223         }
1224
1225         /* We can use Thread-Local storage for most mallocs. We can
1226          * also use TL for ber parsing, but not on Add or Modify.
1227          */
1228 #if 0
1229         memsiz = ber_len( op->o_ber ) * 64;
1230         if ( SLAP_SLAB_SIZE > memsiz ) memsiz = SLAP_SLAB_SIZE;
1231 #endif
1232         memsiz = SLAP_SLAB_SIZE;
1233
1234         memctx = slap_sl_mem_create( memsiz, SLAP_SLAB_STACK, ctx );
1235         op->o_tmpmemctx = memctx;
1236         op->o_tmpmfuncs = &slap_sl_mfuncs;
1237         if ( tag != LDAP_REQ_ADD && tag != LDAP_REQ_MODIFY ) {
1238                 /* Note - the ber and its buffer are already allocated from
1239                  * regular memory; this only affects subsequent mallocs that
1240                  * ber_scanf may invoke.
1241                  */
1242                 ber_set_option( op->o_ber, LBER_OPT_BER_MEMCTX, &memctx );
1243         }
1244
1245         switch ( tag ) {
1246         case LDAP_REQ_BIND:
1247                 opidx = SLAP_OP_BIND;
1248                 break;
1249
1250         case LDAP_REQ_UNBIND:
1251                 opidx = SLAP_OP_UNBIND;
1252                 break;
1253
1254         case LDAP_REQ_ADD:
1255                 opidx = SLAP_OP_ADD;
1256                 break;
1257
1258         case LDAP_REQ_DELETE:
1259                 opidx = SLAP_OP_DELETE;
1260                 break;
1261
1262         case LDAP_REQ_MODRDN:
1263                 opidx = SLAP_OP_MODRDN;
1264                 break;
1265
1266         case LDAP_REQ_MODIFY:
1267                 opidx = SLAP_OP_MODIFY;
1268                 break;
1269
1270         case LDAP_REQ_COMPARE:
1271                 opidx = SLAP_OP_COMPARE;
1272                 break;
1273
1274         case LDAP_REQ_SEARCH:
1275                 opidx = SLAP_OP_SEARCH;
1276                 break;
1277
1278         case LDAP_REQ_ABANDON:
1279                 opidx = SLAP_OP_ABANDON;
1280                 break;
1281
1282         case LDAP_REQ_EXTENDED:
1283                 opidx = SLAP_OP_EXTENDED;
1284                 break;
1285
1286         default:
1287                 /* not reachable */
1288                 assert( 0 );
1289         }
1290
1291         assert( opidx > -1 );
1292         INCR_OP_INITIATED( opidx );
1293         rc = (*(opfun[opidx]))( op, &rs );
1294
1295 operations_error:
1296         if ( rc == SLAPD_DISCONNECT ) {
1297                 tag = LBER_ERROR;
1298
1299         } else if ( opidx > -1 ) {
1300                 /* increment completed operations count
1301                  * only if operation was initiated
1302                  * and rc != SLAPD_DISCONNECT */
1303                 INCR_OP_COMPLETED( opidx );
1304         }
1305
1306         if ( op->o_cancel == SLAP_CANCEL_REQ ) {
1307                 if ( rc == SLAPD_ABANDON ) {
1308                         op->o_cancel = SLAP_CANCEL_ACK;
1309                 } else {
1310                         op->o_cancel = LDAP_TOO_LATE;
1311                 }
1312         }
1313         while ( op->o_cancel != SLAP_CANCEL_NONE &&
1314                 op->o_cancel != SLAP_CANCEL_DONE )
1315         {
1316                 ldap_pvt_thread_yield();
1317         }
1318
1319         ldap_pvt_thread_mutex_lock( &conn->c_mutex );
1320
1321         ber_set_option( op->o_ber, LBER_OPT_BER_MEMCTX, &memctx_null );
1322
1323         LDAP_STAILQ_REMOVE( &conn->c_ops, op, slap_op, o_next);
1324         LDAP_STAILQ_NEXT(op, o_next) = NULL;
1325         slap_op_free( op );
1326         conn->c_n_ops_executing--;
1327         conn->c_n_ops_completed++;
1328
1329         switch( tag ) {
1330         case LBER_ERROR:
1331         case LDAP_REQ_UNBIND:
1332                 /* c_mutex is locked */
1333                 connection_closing( conn,
1334                         tag == LDAP_REQ_UNBIND ? NULL : "operations error" );
1335                 break;
1336
1337         case LDAP_REQ_BIND:
1338                 conn->c_sasl_bind_in_progress =
1339                         rc == LDAP_SASL_BIND_IN_PROGRESS ? 1 : 0;
1340
1341                 if( conn->c_conn_state == SLAP_C_BINDING) {
1342                         conn->c_conn_state = SLAP_C_ACTIVE;
1343                 }
1344         }
1345
1346         connection_resched( conn );
1347         ldap_pvt_thread_mutex_unlock( &conn->c_mutex );
1348         return NULL;
1349 }
1350
1351 static const Listener dummy_list = { BER_BVC(""), BER_BVC("") };
1352
1353 int connection_client_setup(
1354         ber_socket_t s,
1355         ldap_pvt_thread_start_t *func,
1356         void *arg )
1357 {
1358         int rc;
1359         Connection *c;
1360
1361         rc = connection_init( s, (Listener *)&dummy_list, "", "",
1362                 CONN_IS_CLIENT, 0, NULL );
1363         if ( rc < 0 ) return -1;
1364
1365         c = connection_get( s );
1366         c->c_clientfunc = func;
1367         c->c_clientarg = arg;
1368
1369         slapd_add_internal( s, 0 );
1370         slapd_set_read( s, 1 );
1371         connection_return( c );
1372         return 0;
1373 }
1374
1375 void connection_client_enable(
1376         ber_socket_t s )
1377 {
1378         slapd_set_read( s, 1 );
1379 }
1380
1381 void connection_client_stop(
1382         ber_socket_t s )
1383 {
1384         Connection *c;
1385
1386         /* get (locked) connection */
1387         c = connection_get( s );
1388
1389         assert( c->c_conn_state == SLAP_C_CLIENT );
1390
1391         c->c_listener = NULL;
1392         c->c_conn_state = SLAP_C_INVALID;
1393         c->c_struct_state = SLAP_C_UNUSED;
1394         c->c_close_reason = "?";                        /* should never be needed */
1395         slapd_sd_lock();
1396         ber_sockbuf_free( c->c_sb );
1397         slapd_remove( s, 0, 1, 1 );
1398         c->c_sb = ber_sockbuf_alloc( );
1399         {
1400                 ber_len_t max = sockbuf_max_incoming;
1401                 ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_SET_MAX_INCOMING, &max );
1402         }
1403
1404         connection_return( c );
1405 }
1406
1407 #ifdef SLAP_LIGHTWEIGHT_DISPATCHER
1408 static int connection_read( ber_socket_t s, Operation** op );
1409
1410 static void* connection_read_thread( void* ctx, void* argv )
1411 {
1412         int rc ;
1413         Operation* new_op = NULL;
1414         ber_socket_t s = (long)argv;
1415
1416         /*
1417          * read incoming LDAP requests. If there is more than one,
1418          * the first one is returned with new_op
1419          */
1420         if( ( rc = connection_read( s, &new_op ) ) < 0 ) {
1421                 Debug( LDAP_DEBUG_CONNS, "connection_read(%d) error\n", s, 0, 0 );
1422                 return (void*)(long)rc;
1423         }
1424
1425         /* execute the queued request in the same thread */
1426         if( new_op ) {
1427                 rc = (long)connection_operation( ctx, new_op );
1428         }
1429
1430         return (void*)(long)rc;
1431 }
1432
1433 int connection_read_activate( ber_socket_t s )
1434 {
1435         int rc;
1436
1437         /*
1438          * suspend reading on this file descriptor until a connection processing
1439          * thread reads data on it. Otherwise the listener thread will repeatedly
1440          * submit the same event on it to the pool.
1441          */
1442         rc = slapd_clr_read( s, 0 );
1443         if ( rc )
1444                 return rc;
1445
1446         rc = ldap_pvt_thread_pool_submit( &connection_pool,
1447                 connection_read_thread, (void *)(long)s );
1448
1449         if( rc != 0 ) {
1450                 Debug( LDAP_DEBUG_ANY,
1451                         "connection_read_activate(%d): submit failed (%d)\n",
1452                         s, rc, 0 );
1453         }
1454
1455         return rc;
1456 }
1457 #endif
1458
1459 #ifdef SLAP_LIGHTWEIGHT_DISPATCHER
1460 static int
1461 connection_read( ber_socket_t s, Operation** op )
1462 #else
1463 int connection_read(ber_socket_t s)
1464 #endif
1465 {
1466         int rc = 0;
1467         Connection *c;
1468
1469         assert( connections != NULL );
1470
1471         ldap_pvt_thread_mutex_lock( MCA_GET_CONN_MUTEX(s) );
1472
1473         /* get (locked) connection */
1474         c = connection_get( s );
1475
1476         if( c == NULL ) {
1477                 Debug( LDAP_DEBUG_ANY,
1478                         "connection_read(%ld): no connection!\n",
1479                         (long) s, 0, 0 );
1480
1481                 ldap_pvt_thread_mutex_unlock( MCA_GET_CONN_MUTEX(s) );
1482                 return -1;
1483         }
1484
1485         c->c_n_read++;
1486
1487         if( c->c_conn_state == SLAP_C_CLOSING ) {
1488                 Debug( LDAP_DEBUG_TRACE,
1489                         "connection_read(%d): closing, ignoring input for id=%lu\n",
1490                         s, c->c_connid, 0 );
1491
1492 #ifdef SLAP_LIGHTWEIGHT_DISPATCHER
1493                 slapd_set_read( s, 1 );
1494 #endif
1495                 connection_return( c );
1496                 ldap_pvt_thread_mutex_unlock( MCA_GET_CONN_MUTEX(s) );
1497                 return 0;
1498         }
1499
1500         if ( c->c_conn_state == SLAP_C_CLIENT ) {
1501 #ifdef SLAP_LIGHTWEIGHT_DISPATCHER
1502                 /* read should already be cleared */
1503 #else
1504                 slapd_clr_read( s, 0 );
1505 #endif
1506                 ldap_pvt_thread_pool_submit( &connection_pool,
1507                         c->c_clientfunc, c->c_clientarg );
1508
1509                 connection_return( c );
1510                 ldap_pvt_thread_mutex_unlock( MCA_GET_CONN_MUTEX(s) );
1511                 return 0;
1512         }
1513
1514         Debug( LDAP_DEBUG_TRACE,
1515                 "connection_read(%d): checking for input on id=%lu\n",
1516                 s, c->c_connid, 0 );
1517
1518 #ifdef HAVE_TLS
1519         if ( c->c_is_tls && c->c_needs_tls_accept ) {
1520                 rc = ldap_pvt_tls_accept( c->c_sb, slap_tls_ctx );
1521                 if ( rc < 0 ) {
1522                         Debug( LDAP_DEBUG_TRACE,
1523                                 "connection_read(%d): TLS accept failure "
1524                                 "error=%d id=%lu, closing\n",
1525                                 s, rc, c->c_connid );
1526
1527                         c->c_needs_tls_accept = 0;
1528                         /* connections_mutex and c_mutex are locked */
1529                         connection_closing( c, "TLS negotiation failure" );
1530
1531 #if 0
1532                         {
1533                                 struct timeval tv;
1534                                 fd_set rfd;
1535                                 /* Drain input before close, to allow SSL error codes
1536                                  * to propagate to client. */
1537                                 FD_ZERO(&rfd);
1538                                 FD_SET(s, &rfd);
1539                                 for (rc=1; rc>0;) {
1540                                         tv.tv_sec = 1;
1541                                         tv.tv_usec = 0;
1542                                         rc = select(s+1, &rfd, NULL, NULL, &tv);
1543                                         if (rc == 1) {
1544                                                 ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_DRAIN, NULL);
1545                                         }
1546                                 }
1547                         }
1548 #endif
1549
1550                         connection_close( c );
1551                         connection_return( c );
1552                         ldap_pvt_thread_mutex_unlock( MCA_GET_CONN_MUTEX(s) );
1553                         return 0;
1554
1555                 } else if ( rc == 0 ) {
1556                         void *ssl;
1557                         struct berval authid = BER_BVNULL;
1558
1559                         c->c_needs_tls_accept = 0;
1560
1561                         /* we need to let SASL know */
1562                         ssl = ldap_pvt_tls_sb_ctx( c->c_sb );
1563
1564                         c->c_tls_ssf = (slap_ssf_t) ldap_pvt_tls_get_strength( ssl );
1565                         if( c->c_tls_ssf > c->c_ssf ) {
1566                                 c->c_ssf = c->c_tls_ssf;
1567                         }
1568
1569                         rc = dnX509peerNormalize( ssl, &authid );
1570                         if ( rc != LDAP_SUCCESS ) {
1571                                 Debug( LDAP_DEBUG_TRACE, "connection_read(%d): "
1572                                         "unable to get TLS client DN, error=%d id=%lu\n",
1573                                         s, rc, c->c_connid );
1574                         }
1575                         Statslog( LDAP_DEBUG_STATS,
1576                                 "conn=%lu fd=%d TLS established tls_ssf=%u ssf=%u\n",
1577                             c->c_connid, (int) s, c->c_tls_ssf, c->c_ssf, 0 );
1578                         slap_sasl_external( c, c->c_tls_ssf, &authid );
1579                         if ( authid.bv_val ) free( authid.bv_val );
1580                 }
1581
1582                 /* if success and data is ready, fall thru to data input loop */
1583                 if( rc != 0 ||
1584                         !ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_DATA_READY, NULL ) )
1585                 {
1586 #ifdef SLAP_LIGHTWEIGHT_DISPATCHER
1587                         slapd_set_read( s, 1 );
1588 #endif
1589
1590                         connection_return( c );
1591                         ldap_pvt_thread_mutex_unlock( MCA_GET_CONN_MUTEX(s) );
1592                         return 0;
1593                 }
1594         }
1595 #endif
1596
1597 #ifdef HAVE_CYRUS_SASL
1598         if ( c->c_sasl_layers ) {
1599                 /* If previous layer is not removed yet, give up for now */
1600                 if ( !c->c_sasl_sockctx ) {
1601 #ifdef SLAP_LIGHTWEIGHT_DISPATCHER
1602                         slapd_set_read( s, 1 );
1603 #endif
1604
1605                         connection_return( c );
1606                         ldap_pvt_thread_mutex_unlock( MCA_GET_CONN_MUTEX(s) );
1607                         return 0;
1608                 }
1609
1610                 c->c_sasl_layers = 0;
1611
1612                 rc = ldap_pvt_sasl_install( c->c_sb, c->c_sasl_sockctx );
1613                 if( rc != LDAP_SUCCESS ) {
1614                         Debug( LDAP_DEBUG_TRACE,
1615                                 "connection_read(%d): SASL install error "
1616                                 "error=%d id=%lu, closing\n",
1617                                 s, rc, c->c_connid );
1618
1619                         /* connections_mutex and c_mutex are locked */
1620                         connection_closing( c, "SASL layer install failure" );
1621                         connection_close( c );
1622                         connection_return( c );
1623                         ldap_pvt_thread_mutex_unlock( MCA_GET_CONN_MUTEX(s) );
1624                         return 0;
1625                 }
1626         }
1627 #endif
1628
1629 #define CONNECTION_INPUT_LOOP 1
1630 /* #define      DATA_READY_LOOP 1 */
1631
1632         do {
1633                 /* How do we do this without getting into a busy loop ? */
1634 #ifdef SLAP_LIGHTWEIGHT_DISPATCHER
1635                 rc = connection_input( c, op );
1636 #else
1637                 rc = connection_input( c );
1638 #endif
1639         }
1640 #ifdef DATA_READY_LOOP
1641         while( !rc && ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_DATA_READY, NULL ));
1642 #elif CONNECTION_INPUT_LOOP
1643         while(!rc);
1644 #else
1645         while(0);
1646 #endif
1647
1648         if( rc < 0 ) {
1649                 Debug( LDAP_DEBUG_TRACE,
1650                         "connection_read(%d): input error=%d id=%lu, closing.\n",
1651                         s, rc, c->c_connid );
1652
1653                 /* connections_mutex and c_mutex are locked */
1654                 connection_closing( c, conn_lost_str );
1655                 connection_close( c );
1656                 connection_return( c );
1657                 ldap_pvt_thread_mutex_unlock( MCA_GET_CONN_MUTEX(s) );
1658                 return 0;
1659         }
1660
1661 #ifdef SLAP_LIGHTWEIGHT_DISPATCHER
1662         if ( ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_NEEDS_WRITE, NULL ) ) {
1663                 slapd_set_write( s, 0 );
1664         }
1665
1666         slapd_set_read( s, 1 );
1667 #else
1668         if ( ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_NEEDS_READ, NULL ) ) {
1669                 slapd_set_read( s, 1 );
1670         }
1671
1672         if ( ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_NEEDS_WRITE, NULL ) ) {
1673                 slapd_set_write( s, 1 );
1674         }
1675 #endif
1676
1677         connection_return( c );
1678         ldap_pvt_thread_mutex_unlock( MCA_GET_CONN_MUTEX(s) );
1679
1680         return 0;
1681 }
1682
1683 static int
1684 #ifdef SLAP_LIGHTWEIGHT_DISPATCHER
1685 connection_input( Connection *conn , Operation** c_op )
1686 #else
1687 connection_input( Connection *conn )
1688 #endif
1689 {
1690         Operation *op;
1691         ber_tag_t       tag;
1692         ber_len_t       len;
1693         ber_int_t       msgid;
1694         BerElement      *ber;
1695         int             rc;
1696 #ifdef LDAP_CONNECTIONLESS
1697         Sockaddr        peeraddr;
1698         char            *cdn = NULL;
1699 #endif
1700         char *defer = NULL;
1701
1702         if ( conn->c_currentber == NULL &&
1703                 ( conn->c_currentber = ber_alloc()) == NULL )
1704         {
1705                 Debug( LDAP_DEBUG_ANY, "ber_alloc failed\n", 0, 0, 0 );
1706                 return -1;
1707         }
1708
1709         errno = 0;
1710
1711 #ifdef LDAP_CONNECTIONLESS
1712         if ( conn->c_is_udp ) {
1713                 char peername[sizeof("IP=255.255.255.255:65336")];
1714
1715                 len = ber_int_sb_read(conn->c_sb, &peeraddr, sizeof(struct sockaddr));
1716                 if (len != sizeof(struct sockaddr)) return 1;
1717
1718                 sprintf( peername, "IP=%s:%d",
1719                         inet_ntoa( peeraddr.sa_in_addr.sin_addr ),
1720                         (unsigned) ntohs( peeraddr.sa_in_addr.sin_port ) );
1721                 Statslog( LDAP_DEBUG_STATS,
1722                         "conn=%lu UDP request from %s (%s) accepted.\n",
1723                         conn->c_connid, peername, conn->c_sock_name.bv_val, 0, 0 );
1724         }
1725 #endif
1726
1727         tag = ber_get_next( conn->c_sb, &len, conn->c_currentber );
1728         if ( tag != LDAP_TAG_MESSAGE ) {
1729                 int err = errno;
1730                 ber_socket_t    sd;
1731
1732                 ber_sockbuf_ctrl( conn->c_sb, LBER_SB_OPT_GET_FD, &sd );
1733
1734                 Debug( LDAP_DEBUG_TRACE,
1735                         "ber_get_next on fd %d failed errno=%d (%s)\n",
1736                         sd, err, sock_errstr(err) );
1737                 if ( err != EWOULDBLOCK && err != EAGAIN ) {
1738                         /* log, close and send error */
1739                         ber_free( conn->c_currentber, 1 );
1740                         conn->c_currentber = NULL;
1741
1742                         return -2;
1743                 }
1744                 return 1;
1745         }
1746
1747         ber = conn->c_currentber;
1748         conn->c_currentber = NULL;
1749
1750         if ( (tag = ber_get_int( ber, &msgid )) != LDAP_TAG_MSGID ) {
1751                 /* log, close and send error */
1752                 Debug( LDAP_DEBUG_ANY, "ber_get_int returns 0x%lx\n", tag, 0, 0 );
1753                 ber_free( ber, 1 );
1754                 return -1;
1755         }
1756
1757         if ( (tag = ber_peek_tag( ber, &len )) == LBER_ERROR ) {
1758                 /* log, close and send error */
1759                 Debug( LDAP_DEBUG_ANY, "ber_peek_tag returns 0x%lx\n", tag, 0, 0 );
1760                 ber_free( ber, 1 );
1761
1762                 return -1;
1763         }
1764
1765 #ifdef LDAP_CONNECTIONLESS
1766         if( conn->c_is_udp ) {
1767                 if( tag == LBER_OCTETSTRING ) {
1768                         ber_get_stringa( ber, &cdn );
1769                         tag = ber_peek_tag(ber, &len);
1770                 }
1771                 if( tag != LDAP_REQ_ABANDON && tag != LDAP_REQ_SEARCH ) {
1772                         Debug( LDAP_DEBUG_ANY, "invalid req for UDP 0x%lx\n", tag, 0, 0 );
1773                         ber_free( ber, 1 );
1774                         return 0;
1775                 }
1776         }
1777 #endif
1778
1779         if(tag == LDAP_REQ_BIND) {
1780                 /* immediately abandon all existing operations upon BIND */
1781                 connection_abandon( conn );
1782         }
1783
1784         op = slap_op_alloc( ber, msgid, tag, conn->c_n_ops_received++ );
1785
1786         op->o_conn = conn;
1787         /* clear state if the connection is being reused from inactive */
1788         if ( conn->c_conn_state == SLAP_C_INACTIVE ) {
1789                 memset( &conn->c_pagedresults_state, 0,
1790                         sizeof( conn->c_pagedresults_state ) );
1791         }
1792
1793         op->o_res_ber = NULL;
1794
1795 #ifdef LDAP_CONNECTIONLESS
1796         if (conn->c_is_udp) {
1797                 if ( cdn ) {
1798                         ber_str2bv( cdn, 0, 1, &op->o_dn );
1799                         op->o_protocol = LDAP_VERSION2;
1800                 }
1801                 op->o_res_ber = ber_alloc_t( LBER_USE_DER );
1802                 if (op->o_res_ber == NULL) return 1;
1803
1804                 rc = ber_write( op->o_res_ber, (char *)&peeraddr,
1805                         sizeof(struct sockaddr), 0 );
1806
1807                 if (rc != sizeof(struct sockaddr)) {
1808                         Debug( LDAP_DEBUG_ANY, "ber_write failed\n", 0, 0, 0 );
1809                         return 1;
1810                 }
1811
1812                 if (op->o_protocol == LDAP_VERSION2) {
1813                         rc = ber_printf(op->o_res_ber, "{is{" /*}}*/, op->o_msgid, "");
1814                         if (rc == -1) {
1815                                 Debug( LDAP_DEBUG_ANY, "ber_write failed\n", 0, 0, 0 );
1816                                 return rc;
1817                         }
1818                 }
1819         }
1820 #endif /* LDAP_CONNECTIONLESS */
1821
1822         rc = 0;
1823
1824         /* Don't process requests when the conn is in the middle of a
1825          * Bind, or if it's closing. Also, don't let any single conn
1826          * use up all the available threads, and don't execute if we're
1827          * currently blocked on output. And don't execute if there are
1828          * already pending ops, let them go first.  Abandon operations
1829          * get exceptions to some, but not all, cases.
1830          */
1831         switch( tag ){
1832         default:
1833                 /* Abandon and Unbind are exempt from these checks */
1834                 if (conn->c_conn_state == SLAP_C_CLOSING) {
1835                         defer = "closing";
1836                         break;
1837                 } else if (conn->c_writewaiter) {
1838                         defer = "awaiting write";
1839                         break;
1840                 } else if (conn->c_n_ops_pending) {
1841                         defer = "pending operations";
1842                         break;
1843                 }
1844                 /* FALLTHRU */
1845         case LDAP_REQ_ABANDON:
1846                 /* Unbind is exempt from these checks */
1847                 if (conn->c_n_ops_executing >= connection_pool_max/2) {
1848                         defer = "too many executing";
1849                         break;
1850                 } else if (conn->c_conn_state == SLAP_C_BINDING) {
1851                         defer = "binding";
1852                         break;
1853                 }
1854                 /* FALLTHRU */
1855         case LDAP_REQ_UNBIND:
1856                 break;
1857         }
1858
1859         if( defer ) {
1860                 int max = conn->c_dn.bv_len
1861                         ? slap_conn_max_pending_auth
1862                         : slap_conn_max_pending;
1863
1864                 Debug( LDAP_DEBUG_ANY,
1865                         "connection_input: conn=%lu deferring operation: %s\n",
1866                         conn->c_connid, defer, 0 );
1867                 conn->c_n_ops_pending++;
1868                 LDAP_STAILQ_INSERT_TAIL( &conn->c_pending_ops, op, o_next );
1869                 rc = ( conn->c_n_ops_pending > max ) ? -1 : 0;
1870
1871         } else {
1872                 conn->c_n_ops_executing++;
1873
1874 #if 0
1875                 /*
1876                  * The first op will be processed in the same thread context,
1877                  * Subsequent ops will be submitted to the pool by
1878                  * calling connection_op_activate()
1879                  */
1880                 if ( *c_op == NULL ) {
1881                         /* the first incoming request */
1882                         connection_op_queue( op );
1883                         *c_op = op;
1884                 } else
1885 #endif
1886                 {
1887                         connection_op_activate( op );
1888                 }
1889         }
1890
1891 #ifdef NO_THREADS
1892         if ( conn->c_struct_state != SLAP_C_USED ) {
1893                 /* connection must have got closed underneath us */
1894                 return 1;
1895         }
1896 #endif
1897
1898         assert( conn->c_struct_state == SLAP_C_USED );
1899         return rc;
1900 }
1901
1902 static int
1903 connection_resched( Connection *conn )
1904 {
1905         Operation *op;
1906
1907         if( conn->c_conn_state == SLAP_C_CLOSING ) {
1908                 int rc;
1909                 ber_socket_t    sd;
1910                 ber_sockbuf_ctrl( conn->c_sb, LBER_SB_OPT_GET_FD, &sd );
1911
1912                 /* use trylock to avoid possible deadlock */
1913                 rc = ldap_pvt_thread_mutex_trylock( MCA_GET_CONN_MUTEX( sd ) );
1914
1915                 if( rc ) {
1916                         Debug( LDAP_DEBUG_TRACE,
1917                                 "connection_resched: reaquiring locks conn=%lu sd=%d\n",
1918                                 conn->c_connid, sd, 0 );
1919                         /*
1920                          * reaquire locks in the right order...
1921                          * this may allow another thread to close this connection,
1922                          * so recheck state below.
1923                          */
1924                         ldap_pvt_thread_mutex_unlock( &conn->c_mutex );
1925                         ldap_pvt_thread_mutex_lock( MCA_GET_CONN_MUTEX ( sd ) );
1926                         ldap_pvt_thread_mutex_lock( &conn->c_mutex );
1927                 }
1928
1929                 if( conn->c_conn_state != SLAP_C_CLOSING ) {
1930                         Debug( LDAP_DEBUG_TRACE, "connection_resched: "
1931                                 "closed by other thread conn=%lu sd=%d\n",
1932                                 conn->c_connid, sd, 0 );
1933                 } else {
1934                         Debug( LDAP_DEBUG_TRACE, "connection_resched: "
1935                                 "attempting closing conn=%lu sd=%d\n",
1936                                 conn->c_connid, sd, 0 );
1937                         connection_close( conn );
1938                 }
1939
1940                 ldap_pvt_thread_mutex_unlock( MCA_GET_CONN_MUTEX( sd ) );
1941                 return 0;
1942         }
1943
1944         if( conn->c_conn_state != SLAP_C_ACTIVE || conn->c_writewaiter ) {
1945                 /* other states need different handling */
1946                 return 0;
1947         }
1948
1949         while ((op = LDAP_STAILQ_FIRST( &conn->c_pending_ops )) != NULL) {
1950                 if ( conn->c_n_ops_executing > connection_pool_max/2 ) break;
1951
1952                 LDAP_STAILQ_REMOVE_HEAD( &conn->c_pending_ops, o_next );
1953                 LDAP_STAILQ_NEXT(op, o_next) = NULL;
1954
1955                 /* pending operations should not be marked for abandonment */
1956                 assert(!op->o_abandon);
1957
1958                 conn->c_n_ops_pending--;
1959                 conn->c_n_ops_executing++;
1960
1961                 connection_op_activate( op );
1962
1963                 if ( conn->c_conn_state == SLAP_C_BINDING ) break;
1964         }
1965         return 0;
1966 }
1967
1968 static void
1969 connection_init_log_prefix( Operation *op )
1970 {
1971         if ( op->o_connid == (unsigned long)(-1) ) {
1972                 snprintf( op->o_log_prefix, sizeof( op->o_log_prefix ),
1973                         "conn=-1 op=%lu", op->o_opid );
1974
1975         } else {
1976                 snprintf( op->o_log_prefix, sizeof( op->o_log_prefix ),
1977                         "conn=%lu op=%lu", op->o_connid, op->o_opid );
1978         }
1979 }
1980
1981 static void connection_op_queue( Operation *op )
1982 {
1983         int status;
1984         ber_tag_t tag = op->o_tag;
1985
1986         if (tag == LDAP_REQ_BIND) {
1987                 op->o_conn->c_conn_state = SLAP_C_BINDING;
1988         }
1989
1990         if (!op->o_dn.bv_len) {
1991                 op->o_authz = op->o_conn->c_authz;
1992                 if ( BER_BVISNULL( &op->o_conn->c_sasl_authz_dn )) {
1993                         ber_dupbv( &op->o_dn, &op->o_conn->c_dn );
1994                         ber_dupbv( &op->o_ndn, &op->o_conn->c_ndn );
1995                 } else {
1996                         ber_dupbv( &op->o_dn, &op->o_conn->c_sasl_authz_dn );
1997                         ber_dupbv( &op->o_ndn, &op->o_conn->c_sasl_authz_dn );
1998                 }
1999         }
2000
2001         op->o_authtype = op->o_conn->c_authtype;
2002         ber_dupbv( &op->o_authmech, &op->o_conn->c_authmech );
2003
2004         if (!op->o_protocol) {
2005                 op->o_protocol = op->o_conn->c_protocol
2006                         ? op->o_conn->c_protocol : LDAP_VERSION3;
2007         }
2008
2009         if (op->o_conn->c_conn_state == SLAP_C_INACTIVE &&
2010                 op->o_protocol > LDAP_VERSION2)
2011         {
2012                 op->o_conn->c_conn_state = SLAP_C_ACTIVE;
2013         }
2014
2015         op->o_connid = op->o_conn->c_connid;
2016         connection_init_log_prefix( op );
2017
2018         LDAP_STAILQ_INSERT_TAIL( &op->o_conn->c_ops, op, o_next );
2019 }
2020
2021 static int connection_op_activate( Operation *op )
2022 {
2023         int rc;
2024         ber_tag_t tag = op->o_tag;
2025
2026         connection_op_queue( op );
2027
2028         rc = ldap_pvt_thread_pool_submit( &connection_pool,
2029                 connection_operation, (void *) op );
2030
2031         if ( rc != 0 ) {
2032                 Debug( LDAP_DEBUG_ANY,
2033                         "connection_op_activate: submit failed (%d) for conn=%lu\n",
2034                         rc, op->o_connid, 0 );
2035                 /* should move op to pending list */
2036         }
2037
2038         return rc;
2039 }
2040
2041 #ifdef SLAP_LIGHTWEIGHT_DISPATCHER
2042 static int connection_write( ber_socket_t s );
2043 static void *connection_write_thread( void *ctx, void *arg )
2044 {
2045         return (void *)(long)connection_write((long)arg);
2046 }
2047
2048 int connection_write_activate( ber_socket_t s )
2049 {
2050         int rc;
2051
2052         /*
2053          * suspend reading on this file descriptor until a connection processing
2054          * thread write data on it. Otherwise the listener thread will repeatedly
2055          * submit the same event on it to the pool.
2056          */
2057         slapd_clr_write( s, 0);
2058
2059         rc = ldap_pvt_thread_pool_submit( &connection_pool,
2060                 connection_write_thread, (void *)(long)s );
2061
2062         if( rc != 0 ) {
2063                 Debug( LDAP_DEBUG_ANY,
2064                         "connection_write_activate(%d): submit failed (%d)\n",
2065                         (int) s, rc, 0 );
2066         }
2067         return rc;
2068 }
2069
2070 static
2071 #endif
2072 int connection_write(ber_socket_t s)
2073 {
2074         Connection *c;
2075         Operation *op;
2076
2077         assert( connections != NULL );
2078
2079         ldap_pvt_thread_mutex_lock( MCA_GET_CONN_MUTEX( s ) );
2080
2081         c = connection_get( s );
2082         if( c == NULL ) {
2083                 Debug( LDAP_DEBUG_ANY,
2084                         "connection_write(%ld): no connection!\n",
2085                         (long)s, 0, 0 );
2086                 ldap_pvt_thread_mutex_unlock( MCA_GET_CONN_MUTEX( s ) );
2087                 return -1;
2088         }
2089
2090 #ifndef SLAP_LIGHTWEIGHT_DISPATCHER
2091         slapd_clr_write( s, 0);
2092 #endif
2093         c->c_n_write++;
2094
2095         Debug( LDAP_DEBUG_TRACE,
2096                 "connection_write(%d): waking output for id=%lu\n",
2097                 s, c->c_connid, 0 );
2098         ldap_pvt_thread_cond_signal( &c->c_write_cv );
2099
2100         if ( ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_NEEDS_READ, NULL ) ) {
2101                 slapd_set_read( s, 1 );
2102         }
2103         if ( ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_NEEDS_WRITE, NULL ) ) {
2104                 slapd_set_write( s, 1 );
2105         }
2106
2107         /* If there are ops pending because of a writewaiter,
2108          * start one up.
2109          */
2110         while ((op = LDAP_STAILQ_FIRST( &c->c_pending_ops )) != NULL) {
2111                 if ( !c->c_writewaiter ) break;
2112                 if ( c->c_n_ops_executing > connection_pool_max/2 ) break;
2113
2114                 LDAP_STAILQ_REMOVE_HEAD( &c->c_pending_ops, o_next );
2115                 LDAP_STAILQ_NEXT(op, o_next) = NULL;
2116
2117                 /* pending operations should not be marked for abandonment */
2118                 assert(!op->o_abandon);
2119
2120                 c->c_n_ops_pending--;
2121                 c->c_n_ops_executing++;
2122
2123                 connection_op_activate( op );
2124
2125                 break;
2126         }
2127
2128         connection_return( c );
2129         ldap_pvt_thread_mutex_unlock( MCA_GET_CONN_MUTEX(s) );
2130         return 0;
2131 }
2132
2133 void
2134 connection_fake_init(
2135         Connection *conn,
2136         Operation *op,
2137         void *ctx )
2138 {
2139         conn->c_connid = -1;
2140         conn->c_send_ldap_result = slap_send_ldap_result;
2141         conn->c_send_search_entry = slap_send_search_entry;
2142         conn->c_send_search_reference = slap_send_search_reference;
2143         conn->c_listener = (Listener *)&dummy_list;
2144         conn->c_peer_domain = slap_empty_bv;
2145         conn->c_peer_name = slap_empty_bv;
2146
2147         memset(op, 0, OPERATION_BUFFER_SIZE);
2148         op->o_hdr = (Opheader *)(op+1);
2149         op->o_controls = (void **)(op->o_hdr+1);
2150         /* set memory context */
2151         op->o_tmpmemctx = slap_sl_mem_create(SLAP_SLAB_SIZE, SLAP_SLAB_STACK, ctx);
2152         op->o_tmpmfuncs = &slap_sl_mfuncs;
2153         op->o_threadctx = ctx;
2154
2155         op->o_conn = conn;
2156         op->o_connid = op->o_conn->c_connid;
2157         connection_init_log_prefix( op );
2158
2159         slap_op_time( &op->o_time, &op->o_tincr );
2160 }
2161
2162 void
2163 connection_assign_nextid( Connection *conn )
2164 {
2165         ldap_pvt_thread_mutex_lock( &conn_nextid_mutex );
2166         conn->c_connid = conn_nextid++;
2167         ldap_pvt_thread_mutex_unlock( &conn_nextid_mutex );
2168 }