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 1998-2006 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 /* protected by connections_mutex */
  47 static ldap_pvt_thread_mutex_t connections_mutex;
  48 static Connection *connections = NULL;
  49
  50 static ldap_pvt_thread_mutex_t conn_nextid_mutex;
  51 static unsigned long conn_nextid = 0;
  52
  53 static const char conn_lost_str[] = "connection lost";
  54
  55 /* structure state (protected by connections_mutex) */
  56 #define SLAP_C_UNINITIALIZED    0x00    /* MUST BE ZERO (0) */
  57 #define SLAP_C_UNUSED                   0x01
  58 #define SLAP_C_USED                             0x02
  59 #define SLAP_C_PENDING                  0x03
  60
  61 /* connection state (protected by c_mutex ) */
  62 #define SLAP_C_INVALID                  0x00    /* MUST BE ZERO (0) */
  63 #define SLAP_C_INACTIVE                 0x01    /* zero threads */
  64 #define SLAP_C_ACTIVE                   0x02    /* one or more threads */
  65 #define SLAP_C_BINDING                  0x03    /* binding */
  66 #define SLAP_C_CLOSING                  0x04    /* closing */
  67 #define SLAP_C_CLIENT                   0x05    /* outbound client conn */
  68
  69 const char *
  70 connection_state2str( int state )
  71 {
  72         switch( state ) {
  73         case SLAP_C_INVALID:    return "!";
  74         case SLAP_C_INACTIVE:   return "|";
  75         case SLAP_C_ACTIVE:             return "";
  76         case SLAP_C_BINDING:    return "B";
  77         case SLAP_C_CLOSING:    return "C";
  78         case SLAP_C_CLIENT:             return "L";
  79         }
  80
  81         return "?";
  82 }
  83
  84 static Connection* connection_get( ber_socket_t s );
  85
  86 #ifdef SLAP_LIGHTWEIGHT_DISPATCHER
  87
  88 typedef struct conn_readinfo {
  89         Operation *op;
  90         ldap_pvt_thread_start_t *func;
  91         void *arg;
  92         int nullop;
  93 } conn_readinfo;
  94
  95 static int connection_input( Connection *c, conn_readinfo *cri );
  96 #else
  97 static int connection_input( Connection *c );
  98 #endif
  99 static void connection_close( Connection *c );
 100
 101 static int connection_op_activate( Operation *op );
 102 #ifdef SLAP_LIGHTWEIGHT_DISPATCHER
 103 static void connection_op_queue( Operation *op );
 104 #endif
 105 static int connection_resched( Connection *conn );
 106 static void connection_abandon( Connection *conn );
 107 static void connection_destroy( Connection *c );
 108
 109 static ldap_pvt_thread_start_t connection_operation;
 110
 111 /*
 112  * Initialize connection management infrastructure.
 113  */
 114 int connections_init(void)
 115 {
 116         int i;
 117
 118         assert( connections == NULL );
 119
 120         if( connections != NULL) {
 121                 Debug( LDAP_DEBUG_ANY, "connections_init: already initialized.\n",
 122                         0, 0, 0 );
 123                 return -1;
 124         }
 125
 126         /* should check return of every call */
 127         ldap_pvt_thread_mutex_init( &connections_mutex );
 128         ldap_pvt_thread_mutex_init( &conn_nextid_mutex );
 129
 130         connections = (Connection *) ch_calloc( dtblsize, sizeof(Connection) );
 131
 132         if( connections == NULL ) {
 133                 Debug( LDAP_DEBUG_ANY, "connections_init: "
 134                         "allocation (%d*%ld) of connection array failed\n",
 135                         dtblsize, (long) sizeof(Connection), 0 );
 136                 return -1;
 137         }
 138
 139         assert( connections[0].c_struct_state == SLAP_C_UNINITIALIZED );
 140         assert( connections[dtblsize-1].c_struct_state == SLAP_C_UNINITIALIZED );
 141
 142         for (i=0; i<dtblsize; i++) connections[i].c_conn_idx = i;
 143
 144         /*
 145          * per entry initialization of the Connection array initialization
 146          * will be done by connection_init()
 147          */
 148
 149         return 0;
 150 }
 151
 152 /*
 153  * Destroy connection management infrastructure.
 154  */
 155
 156 int connections_destroy(void)
 157 {
 158         ber_socket_t i;
 159
 160         /* should check return of every call */
 161
 162         if( connections == NULL) {
 163                 Debug( LDAP_DEBUG_ANY, "connections_destroy: nothing to destroy.\n",
 164                         0, 0, 0 );
 165                 return -1;
 166         }
 167
 168         for ( i = 0; i < dtblsize; i++ ) {
 169                 if( connections[i].c_struct_state != SLAP_C_UNINITIALIZED ) {
 170                         ber_sockbuf_free( connections[i].c_sb );
 171                         ldap_pvt_thread_mutex_destroy( &connections[i].c_mutex );
 172                         ldap_pvt_thread_mutex_destroy( &connections[i].c_write_mutex );
 173                         ldap_pvt_thread_cond_destroy( &connections[i].c_write_cv );
 174 #ifdef LDAP_SLAPI
 175                         if ( slapi_plugins_used ) {
 176                                 slapi_int_free_object_extensions( SLAPI_X_EXT_CONNECTION,
 177                                         &connections[i] );
 178                         }
 179 #endif
 180                 }
 181         }
 182
 183         free( connections );
 184         connections = NULL;
 185
 186         ldap_pvt_thread_mutex_destroy( &connections_mutex );
 187         ldap_pvt_thread_mutex_destroy( &conn_nextid_mutex );
 188         return 0;
 189 }
 190
 191 /*
 192  * shutdown all connections
 193  */
 194 int connections_shutdown(void)
 195 {
 196         ber_socket_t i;
 197
 198         for ( i = 0; i < dtblsize; i++ ) {
 199                 if( connections[i].c_struct_state != SLAP_C_USED ) {
 200                         continue;
 201                 }
 202                 /* give persistent clients a chance to cleanup */
 203                 if( connections[i].c_conn_state == SLAP_C_CLIENT ) {
 204                         ldap_pvt_thread_pool_submit( &connection_pool,
 205                         connections[i].c_clientfunc, connections[i].c_clientarg );
 206                         continue;
 207                 }
 208
 209                 ldap_pvt_thread_mutex_lock( &connections[i].c_mutex );
 210
 211                 /* c_mutex is locked */
 212                 connection_closing( &connections[i], "slapd shutdown" );
 213                 connection_close( &connections[i] );
 214
 215                 ldap_pvt_thread_mutex_unlock( &connections[i].c_mutex );
 216         }
 217
 218         return 0;
 219 }
 220
 221 /*
 222  * Timeout idle connections.
 223  */
 224 int connections_timeout_idle(time_t now)
 225 {
 226         int i = 0;
 227         int connindex;
 228         Connection* c;
 229
 230         for( c = connection_first( &connindex );
 231                 c != NULL;
 232                 c = connection_next( c, &connindex ) )
 233         {
 234                 /* Don't timeout a slow-running request or a persistent
 235                  * outbound connection */
 236                 if( c->c_n_ops_executing || c->c_conn_state == SLAP_C_CLIENT ) {
 237                         continue;
 238                 }
 239
 240                 if( difftime( c->c_activitytime+global_idletimeout, now) < 0 ) {
 241                         /* close it */
 242                         connection_closing( c, "idletimeout" );
 243                         connection_close( c );
 244                         i++;
 245                 }
 246         }
 247         connection_done( c );
 248
 249         return i;
 250 }
 251
 252 static Connection* connection_get( ber_socket_t s )
 253 {
 254         Connection *c;
 255
 256         Debug( LDAP_DEBUG_ARGS,
 257                 "connection_get(%ld)\n",
 258                 (long) s, 0, 0 );
 259
 260         assert( connections != NULL );
 261
 262         if(s == AC_SOCKET_INVALID) return NULL;
 263
 264 #ifndef HAVE_WINSOCK
 265         assert( s < dtblsize );
 266         c = &connections[s];
 267
 268 #else
 269         c = NULL;
 270         {
 271                 ber_socket_t i, sd;
 272
 273                 ldap_pvt_thread_mutex_lock( &connections_mutex );
 274                 for(i=0; i<dtblsize; i++) {
 275                         if( connections[i].c_struct_state == SLAP_C_PENDING )
 276                                 continue;
 277
 278                         if( connections[i].c_struct_state == SLAP_C_UNINITIALIZED ) {
 279                                 assert( connections[i].c_conn_state == SLAP_C_INVALID );
 280                                 assert( connections[i].c_sb == 0 );
 281                                 break;
 282                         }
 283
 284                         ber_sockbuf_ctrl( connections[i].c_sb,
 285                                 LBER_SB_OPT_GET_FD, &sd );
 286
 287                         if( connections[i].c_struct_state == SLAP_C_UNUSED ) {
 288                                 assert( connections[i].c_conn_state == SLAP_C_INVALID );
 289                                 assert( sd == AC_SOCKET_INVALID );
 290                                 continue;
 291                         }
 292
 293                         /* state can actually change from used -> unused by resched,
 294                          * so don't assert details here.
 295                          */
 296
 297                         if( sd == s ) {
 298                                 c = &connections[i];
 299                                 break;
 300                         }
 301                 }
 302                 ldap_pvt_thread_mutex_unlock( &connections_mutex );
 303         }
 304 #endif
 305
 306         if( c != NULL ) {
 307                 ber_socket_t    sd;
 308
 309                 assert( c->c_struct_state != SLAP_C_UNINITIALIZED );
 310
 311                 ldap_pvt_thread_mutex_lock( &c->c_mutex );
 312
 313                 ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_GET_FD, &sd );
 314                 if( c->c_struct_state != SLAP_C_USED ) {
 315                         /* connection must have been closed due to resched */
 316
 317                         assert( c->c_conn_state == SLAP_C_INVALID );
 318                         assert( sd == AC_SOCKET_INVALID );
 319
 320                         Debug( LDAP_DEBUG_TRACE,
 321                                 "connection_get(%d): connection not used\n",
 322                                 s, 0, 0 );
 323
 324                         ldap_pvt_thread_mutex_unlock( &c->c_mutex );
 325                         return NULL;
 326                 }
 327
 328                 Debug( LDAP_DEBUG_TRACE,
 329                         "connection_get(%d): got connid=%lu\n",
 330                         s, c->c_connid, 0 );
 331
 332                 c->c_n_get++;
 333
 334                 assert( c->c_struct_state == SLAP_C_USED );
 335                 assert( c->c_conn_state != SLAP_C_INVALID );
 336                 assert( sd != AC_SOCKET_INVALID );
 337
 338 #ifndef SLAPD_MONITOR
 339                 if ( global_idletimeout > 0 )
 340 #endif /* ! SLAPD_MONITOR */
 341                 {
 342                         c->c_activitytime = slap_get_time();
 343                 }
 344         }
 345
 346         return c;
 347 }
 348
 349 static void connection_return( Connection *c )
 350 {
 351         ldap_pvt_thread_mutex_unlock( &c->c_mutex );
 352 }
 353
 354 long connection_init(
 355         ber_socket_t s,
 356         Listener *listener,
 357         const char* dnsname,
 358         const char* peername,
 359         int flags,
 360         slap_ssf_t ssf,
 361         struct berval *authid )
 362 {
 363         unsigned long id;
 364         Connection *c;
 365         int doinit = 0;
 366
 367         assert( connections != NULL );
 368
 369         assert( listener != NULL );
 370         assert( dnsname != NULL );
 371         assert( peername != NULL );
 372
 373 #ifndef HAVE_TLS
 374         assert( flags != CONN_IS_TLS );
 375 #endif
 376
 377         if( s == AC_SOCKET_INVALID ) {
 378                 Debug( LDAP_DEBUG_ANY,
 379                         "connection_init: init of socket %ld invalid.\n", (long)s, 0, 0 );
 380                 return -1;
 381         }
 382
 383         assert( s >= 0 );
 384 #ifndef HAVE_WINSOCK
 385         assert( s < dtblsize );
 386         c = &connections[s];
 387         if( c->c_struct_state == SLAP_C_UNINITIALIZED ) {
 388                 doinit = 1;
 389         } else {
 390                 assert( c->c_struct_state == SLAP_C_UNUSED );
 391         }
 392 #else
 393         {
 394                 ber_socket_t i;
 395                 c = NULL;
 396
 397                 ldap_pvt_thread_mutex_lock( &connections_mutex );
 398                 for( i=0; i < dtblsize; i++) {
 399                         ber_socket_t    sd;
 400
 401                         if ( connections[i].c_struct_state == SLAP_C_PENDING )
 402                                 continue;
 403
 404                         if( connections[i].c_struct_state == SLAP_C_UNINITIALIZED ) {
 405                                 assert( connections[i].c_sb == 0 );
 406                                 c = &connections[i];
 407                                 c->c_struct_state = SLAP_C_PENDING;
 408                                 doinit = 1;
 409                                 break;
 410                         }
 411
 412                         sd = AC_SOCKET_INVALID;
 413                         if (connections[i].c_sb != NULL) {
 414                                 ber_sockbuf_ctrl( connections[i].c_sb,
 415                                         LBER_SB_OPT_GET_FD, &sd );
 416                         }
 417
 418                         if( connections[i].c_struct_state == SLAP_C_UNUSED ) {
 419                                 assert( sd == AC_SOCKET_INVALID );
 420                                 c = &connections[i];
 421                                 c->c_struct_state = SLAP_C_PENDING;
 422                                 break;
 423                         }
 424
 425                         if( connections[i].c_conn_state == SLAP_C_CLIENT ) continue;
 426
 427                         assert( connections[i].c_struct_state == SLAP_C_USED );
 428                         assert( connections[i].c_conn_state != SLAP_C_INVALID );
 429                         assert( sd != AC_SOCKET_INVALID );
 430                 }
 431                 ldap_pvt_thread_mutex_unlock( &connections_mutex );
 432
 433                 if( c == NULL ) {
 434                         Debug( LDAP_DEBUG_ANY,
 435                                 "connection_init(%d): connection table full "
 436                                 "(%d/%d)\n", s, i, dtblsize);
 437                         return -1;
 438                 }
 439         }
 440 #endif
 441
 442         if( doinit ) {
 443                 c->c_send_ldap_result = slap_send_ldap_result;
 444                 c->c_send_search_entry = slap_send_search_entry;
 445                 c->c_send_search_reference = slap_send_search_reference;
 446                 c->c_send_ldap_extended = slap_send_ldap_extended;
 447                 c->c_send_ldap_intermediate = slap_send_ldap_intermediate;
 448
 449                 BER_BVZERO( &c->c_authmech );
 450                 BER_BVZERO( &c->c_dn );
 451                 BER_BVZERO( &c->c_ndn );
 452
 453                 c->c_listener = NULL;
 454                 BER_BVZERO( &c->c_peer_domain );
 455                 BER_BVZERO( &c->c_peer_name );
 456
 457                 LDAP_STAILQ_INIT(&c->c_ops);
 458                 LDAP_STAILQ_INIT(&c->c_pending_ops);
 459
 460 #ifdef LDAP_X_TXN
 461                 c->c_txn = CONN_TXN_INACTIVE;
 462                 c->c_txn_backend = NULL;
 463                 LDAP_STAILQ_INIT(&c->c_txn_ops);
 464 #endif
 465
 466                 BER_BVZERO( &c->c_sasl_bind_mech );
 467                 c->c_sasl_done = 0;
 468                 c->c_sasl_authctx = NULL;
 469                 c->c_sasl_sockctx = NULL;
 470                 c->c_sasl_extra = NULL;
 471                 c->c_sasl_bindop = NULL;
 472
 473                 c->c_sb = ber_sockbuf_alloc( );
 474
 475                 {
 476                         ber_len_t max = sockbuf_max_incoming;
 477                         ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_SET_MAX_INCOMING, &max );
 478                 }
 479
 480                 c->c_currentber = NULL;
 481
 482                 /* should check status of thread calls */
 483                 ldap_pvt_thread_mutex_init( &c->c_mutex );
 484                 ldap_pvt_thread_mutex_init( &c->c_write_mutex );
 485                 ldap_pvt_thread_cond_init( &c->c_write_cv );
 486
 487 #ifdef LDAP_SLAPI
 488                 if ( slapi_plugins_used ) {
 489                         slapi_int_create_object_extensions( SLAPI_X_EXT_CONNECTION, c );
 490                 }
 491 #endif
 492         }
 493
 494         ldap_pvt_thread_mutex_lock( &c->c_mutex );
 495
 496         assert( BER_BVISNULL( &c->c_authmech ) );
 497         assert( BER_BVISNULL( &c->c_dn ) );
 498         assert( BER_BVISNULL( &c->c_ndn ) );
 499         assert( c->c_listener == NULL );
 500         assert( BER_BVISNULL( &c->c_peer_domain ) );
 501         assert( BER_BVISNULL( &c->c_peer_name ) );
 502         assert( LDAP_STAILQ_EMPTY(&c->c_ops) );
 503         assert( LDAP_STAILQ_EMPTY(&c->c_pending_ops) );
 504 #ifdef LDAP_X_TXN
 505         assert( c->c_txn == CONN_TXN_INACTIVE );
 506         assert( c->c_txn_backend == NULL );
 507         assert( LDAP_STAILQ_EMPTY(&c->c_txn_ops) );
 508 #endif
 509         assert( BER_BVISNULL( &c->c_sasl_bind_mech ) );
 510         assert( c->c_sasl_done == 0 );
 511         assert( c->c_sasl_authctx == NULL );
 512         assert( c->c_sasl_sockctx == NULL );
 513         assert( c->c_sasl_extra == NULL );
 514         assert( c->c_sasl_bindop == NULL );
 515         assert( c->c_currentber == NULL );
 516         assert( c->c_writewaiter == 0);
 517
 518         c->c_listener = listener;
 519
 520         if ( flags == CONN_IS_CLIENT ) {
 521                 c->c_conn_state = SLAP_C_CLIENT;
 522                 c->c_struct_state = SLAP_C_USED;
 523                 c->c_close_reason = "?";                        /* should never be needed */
 524                 ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_SET_FD, &s );
 525                 ldap_pvt_thread_mutex_unlock( &c->c_mutex );
 526
 527                 return 0;
 528         }
 529
 530         ber_str2bv( dnsname, 0, 1, &c->c_peer_domain );
 531         ber_str2bv( peername, 0, 1, &c->c_peer_name );
 532
 533         c->c_n_ops_received = 0;
 534         c->c_n_ops_executing = 0;
 535         c->c_n_ops_pending = 0;
 536         c->c_n_ops_completed = 0;
 537
 538         c->c_n_get = 0;
 539         c->c_n_read = 0;
 540         c->c_n_write = 0;
 541
 542         /* set to zero until bind, implies LDAP_VERSION3 */
 543         c->c_protocol = 0;
 544
 545 #ifndef SLAPD_MONITOR
 546         if ( global_idletimeout > 0 )
 547 #endif /* ! SLAPD_MONITOR */
 548         {
 549                 c->c_activitytime = c->c_starttime = slap_get_time();
 550         }
 551
 552 #ifdef LDAP_CONNECTIONLESS
 553         c->c_is_udp = 0;
 554         if( flags == CONN_IS_UDP ) {
 555                 c->c_is_udp = 1;
 556 #ifdef LDAP_DEBUG
 557                 ber_sockbuf_add_io( c->c_sb, &ber_sockbuf_io_debug,
 558                         LBER_SBIOD_LEVEL_PROVIDER, (void*)"udp_" );
 559 #endif
 560                 ber_sockbuf_add_io( c->c_sb, &ber_sockbuf_io_udp,
 561                         LBER_SBIOD_LEVEL_PROVIDER, (void *)&s );
 562                 ber_sockbuf_add_io( c->c_sb, &ber_sockbuf_io_readahead,
 563                         LBER_SBIOD_LEVEL_PROVIDER, NULL );
 564         } else
 565 #endif
 566         {
 567 #ifdef LDAP_DEBUG
 568                 ber_sockbuf_add_io( c->c_sb, &ber_sockbuf_io_debug,
 569                         LBER_SBIOD_LEVEL_PROVIDER, (void*)"tcp_" );
 570 #endif
 571                 ber_sockbuf_add_io( c->c_sb, &ber_sockbuf_io_tcp,
 572                         LBER_SBIOD_LEVEL_PROVIDER, (void *)&s );
 573         }
 574
 575 #ifdef LDAP_DEBUG
 576         ber_sockbuf_add_io( c->c_sb, &ber_sockbuf_io_debug,
 577                 INT_MAX, (void*)"ldap_" );
 578 #endif
 579
 580         if( ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_SET_NONBLOCK,
 581                 c /* non-NULL */ ) < 0 )
 582         {
 583                 Debug( LDAP_DEBUG_ANY,
 584                         "connection_init(%d, %s): set nonblocking failed\n",
 585                         s, c->c_peer_name.bv_val, 0 );
 586         }
 587
 588         ldap_pvt_thread_mutex_lock( &conn_nextid_mutex );
 589         id = c->c_connid = conn_nextid++;
 590         ldap_pvt_thread_mutex_unlock( &conn_nextid_mutex );
 591
 592         c->c_conn_state = SLAP_C_INACTIVE;
 593         c->c_struct_state = SLAP_C_USED;
 594         c->c_close_reason = "?";                        /* should never be needed */
 595
 596         c->c_ssf = c->c_transport_ssf = ssf;
 597         c->c_tls_ssf = 0;
 598
 599 #ifdef HAVE_TLS
 600         if ( flags == CONN_IS_TLS ) {
 601                 c->c_is_tls = 1;
 602                 c->c_needs_tls_accept = 1;
 603         } else {
 604                 c->c_is_tls = 0;
 605                 c->c_needs_tls_accept = 0;
 606         }
 607 #endif
 608
 609         slap_sasl_open( c, 0 );
 610         slap_sasl_external( c, ssf, authid );
 611
 612         slapd_add_internal( s, 1 );
 613         ldap_pvt_thread_mutex_unlock( &c->c_mutex );
 614
 615         backend_connection_init(c);
 616
 617         return id;
 618 }
 619
 620 void connection2anonymous( Connection *c )
 621 {
 622         assert( connections != NULL );
 623         assert( c != NULL );
 624
 625         {
 626                 ber_len_t max = sockbuf_max_incoming;
 627                 ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_SET_MAX_INCOMING, &max );
 628         }
 629
 630         if ( !BER_BVISNULL( &c->c_authmech ) ) {
 631                 ch_free(c->c_authmech.bv_val);
 632         }
 633         BER_BVZERO( &c->c_authmech );
 634
 635         if ( !BER_BVISNULL( &c->c_dn ) ) {
 636                 ch_free(c->c_dn.bv_val);
 637         }
 638         BER_BVZERO( &c->c_dn );
 639
 640         if ( !BER_BVISNULL( &c->c_ndn ) ) {
 641                 ch_free(c->c_ndn.bv_val);
 642         }
 643         BER_BVZERO( &c->c_ndn );
 644
 645         if ( !BER_BVISNULL( &c->c_sasl_authz_dn ) ) {
 646                 ber_memfree_x( c->c_sasl_authz_dn.bv_val, NULL );
 647         }
 648         BER_BVZERO( &c->c_sasl_authz_dn );
 649
 650         c->c_authz_backend = NULL;
 651 }
 652
 653 static void
 654 connection_destroy( Connection *c )
 655 {
 656         ber_socket_t    sd;
 657         unsigned long   connid;
 658         const char              *close_reason;
 659         Sockbuf                 *sb;
 660
 661         assert( connections != NULL );
 662         assert( c != NULL );
 663         assert( c->c_struct_state != SLAP_C_UNUSED );
 664         assert( c->c_conn_state != SLAP_C_INVALID );
 665         assert( LDAP_STAILQ_EMPTY(&c->c_ops) );
 666         assert( LDAP_STAILQ_EMPTY(&c->c_pending_ops) );
 667 #ifdef LDAP_X_TXN
 668         assert( c->c_txn == CONN_TXN_INACTIVE );
 669         assert( c->c_txn_backend == NULL );
 670         assert( LDAP_STAILQ_EMPTY(&c->c_txn_ops) );
 671 #endif
 672         assert( c->c_writewaiter == 0);
 673
 674         /* only for stats (print -1 as "%lu" may give unexpected results ;) */
 675         connid = c->c_connid;
 676         close_reason = c->c_close_reason;
 677
 678         ldap_pvt_thread_mutex_lock( &connections_mutex );
 679         c->c_struct_state = SLAP_C_PENDING;
 680         ldap_pvt_thread_mutex_unlock( &connections_mutex );
 681
 682         backend_connection_destroy(c);
 683
 684         c->c_protocol = 0;
 685         c->c_connid = -1;
 686
 687         c->c_activitytime = c->c_starttime = 0;
 688
 689         connection2anonymous( c );
 690         c->c_listener = NULL;
 691
 692         if(c->c_peer_domain.bv_val != NULL) {
 693                 free(c->c_peer_domain.bv_val);
 694         }
 695         BER_BVZERO( &c->c_peer_domain );
 696         if(c->c_peer_name.bv_val != NULL) {
 697                 free(c->c_peer_name.bv_val);
 698         }
 699         BER_BVZERO( &c->c_peer_name );
 700
 701         c->c_sasl_bind_in_progress = 0;
 702         if(c->c_sasl_bind_mech.bv_val != NULL) {
 703                 free(c->c_sasl_bind_mech.bv_val);
 704         }
 705         BER_BVZERO( &c->c_sasl_bind_mech );
 706
 707         slap_sasl_close( c );
 708
 709         if ( c->c_currentber != NULL ) {
 710                 ber_free( c->c_currentber, 1 );
 711                 c->c_currentber = NULL;
 712         }
 713
 714
 715 #ifdef LDAP_SLAPI
 716         /* call destructors, then constructors; avoids unnecessary allocation */
 717         if ( slapi_plugins_used ) {
 718                 slapi_int_clear_object_extensions( SLAPI_X_EXT_CONNECTION, c );
 719         }
 720 #endif
 721
 722         c->c_conn_state = SLAP_C_INVALID;
 723         c->c_struct_state = SLAP_C_UNUSED;
 724         c->c_close_reason = "?";                        /* should never be needed */
 725
 726         sb = c->c_sb;
 727         c->c_sb = ber_sockbuf_alloc( );
 728         {
 729                 ber_len_t max = sockbuf_max_incoming;
 730                 ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_SET_MAX_INCOMING, &max );
 731         }
 732
 733         ber_sockbuf_ctrl( sb, LBER_SB_OPT_GET_FD, &sd );
 734
 735         /* c must be fully reset by this point; when we call slapd_remove
 736          * it may get immediately reused by a new connection.
 737          */
 738         if ( sd != AC_SOCKET_INVALID ) {
 739                 slapd_remove( sd, sb, 1, 0, 0 );
 740
 741                 if ( close_reason == NULL ) {
 742                         close_reason = "";
 743                 }
 744
 745                 Statslog( LDAP_DEBUG_STATS, "conn=%lu fd=%ld closed (%s)\n",
 746                         connid, (long) sd, close_reason, 0, 0 );
 747         }
 748 }
 749
 750 int connection_state_closing( Connection *c )
 751 {
 752         /* c_mutex must be locked by caller */
 753
 754         int state;
 755         assert( c != NULL );
 756         assert( c->c_struct_state == SLAP_C_USED );
 757
 758         state = c->c_conn_state;
 759
 760         assert( state != SLAP_C_INVALID );
 761
 762         return state == SLAP_C_CLOSING;
 763 }
 764
 765 static void connection_abandon( Connection *c )
 766 {
 767         /* c_mutex must be locked by caller */
 768
 769         Operation *o, *next, op = {0};
 770         Opheader ohdr = {0};
 771         SlapReply rs = {0};
 772
 773         op.o_hdr = &ohdr;
 774         op.o_conn = c;
 775         op.o_connid = c->c_connid;
 776         op.o_tag = LDAP_REQ_ABANDON;
 777
 778         for ( o = LDAP_STAILQ_FIRST( &c->c_ops ); o; o=next ) {
 779                 next = LDAP_STAILQ_NEXT( o, o_next );
 780                 op.orn_msgid = o->o_msgid;
 781                 o->o_abandon = 1;
 782                 op.o_bd = frontendDB;
 783                 frontendDB->be_abandon( &op, &rs );
 784         }
 785
 786 #ifdef LDAP_X_TXN
 787         /* remove operations in pending transaction */
 788         while ( (o = LDAP_STAILQ_FIRST( &c->c_txn_ops )) != NULL) {
 789                 LDAP_STAILQ_REMOVE_HEAD( &c->c_txn_ops, o_next );
 790                 LDAP_STAILQ_NEXT(o, o_next) = NULL;
 791                 slap_op_free( o );
 792         }
 793
 794         /* clear transaction */
 795         c->c_txn_backend = NULL;
 796         c->c_txn = CONN_TXN_INACTIVE;
 797 #endif
 798
 799         /* remove pending operations */
 800         while ( (o = LDAP_STAILQ_FIRST( &c->c_pending_ops )) != NULL) {
 801                 LDAP_STAILQ_REMOVE_HEAD( &c->c_pending_ops, o_next );
 802                 LDAP_STAILQ_NEXT(o, o_next) = NULL;
 803                 slap_op_free( o );
 804         }
 805 }
 806
 807 void connection_closing( Connection *c, const char *why )
 808 {
 809         assert( connections != NULL );
 810         assert( c != NULL );
 811         assert( c->c_struct_state == SLAP_C_USED );
 812         assert( c->c_conn_state != SLAP_C_INVALID );
 813
 814         /* c_mutex must be locked by caller */
 815
 816         if( c->c_conn_state != SLAP_C_CLOSING ) {
 817                 ber_socket_t    sd;
 818
 819                 ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_GET_FD, &sd );
 820                 Debug( LDAP_DEBUG_TRACE,
 821                         "connection_closing: readying conn=%lu sd=%d for close\n",
 822                         c->c_connid, sd, 0 );
 823                 /* update state to closing */
 824                 c->c_conn_state = SLAP_C_CLOSING;
 825                 c->c_close_reason = why;
 826
 827                 /* don't listen on this port anymore */
 828                 slapd_clr_read( sd, 0 );
 829
 830                 /* abandon active operations */
 831                 connection_abandon( c );
 832
 833                 /* wake write blocked operations */
 834                 if ( c->c_writewaiter ) {
 835                         ldap_pvt_thread_cond_signal( &c->c_write_cv );
 836                         /* ITS#4667 this may allow another thread to drop into
 837                          * connection_resched / connection_close before we
 838                          * finish, but that's OK.
 839                          */
 840                         slapd_clr_write( sd, 1 );
 841                         ldap_pvt_thread_mutex_unlock( &c->c_mutex );
 842                         ldap_pvt_thread_mutex_lock( &c->c_write_mutex );
 843                         ldap_pvt_thread_mutex_lock( &c->c_mutex );
 844                         ldap_pvt_thread_mutex_unlock( &c->c_write_mutex );
 845                 } else {
 846                         slapd_clr_write( sd, 1 );
 847                 }
 848
 849         } else if( why == NULL && c->c_close_reason == conn_lost_str ) {
 850                 /* Client closed connection after doing Unbind. */
 851                 c->c_close_reason = NULL;
 852         }
 853 }
 854
 855 static void
 856 connection_close( Connection *c )
 857 {
 858         ber_socket_t    sd = AC_SOCKET_INVALID;
 859
 860         assert( connections != NULL );
 861         assert( c != NULL );
 862
 863         /* ITS#4667 we may have gotten here twice */
 864         if ( c->c_conn_state == SLAP_C_INVALID )
 865                 return;
 866
 867         assert( c->c_struct_state == SLAP_C_USED );
 868         assert( c->c_conn_state == SLAP_C_CLOSING );
 869
 870         /* NOTE: c_mutex should be locked by caller */
 871
 872         /* NOTE: don't get the file descriptor if not needed */
 873         if ( LogTest( LDAP_DEBUG_TRACE ) ) {
 874                 ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_GET_FD, &sd );
 875         }
 876
 877         if ( !LDAP_STAILQ_EMPTY(&c->c_ops) ||
 878                 !LDAP_STAILQ_EMPTY(&c->c_pending_ops) )
 879         {
 880                 Debug( LDAP_DEBUG_TRACE,
 881                         "connection_close: deferring conn=%lu sd=%d\n",
 882                         c->c_connid, sd, 0 );
 883                 return;
 884         }
 885
 886         Debug( LDAP_DEBUG_TRACE, "connection_close: conn=%lu sd=%d\n",
 887                 c->c_connid, sd, 0 );
 888
 889         connection_destroy( c );
 890 }
 891
 892 unsigned long connections_nextid(void)
 893 {
 894         unsigned long id;
 895         assert( connections != NULL );
 896
 897         ldap_pvt_thread_mutex_lock( &conn_nextid_mutex );
 898
 899         id = conn_nextid;
 900
 901         ldap_pvt_thread_mutex_unlock( &conn_nextid_mutex );
 902
 903         return id;
 904 }
 905
 906 Connection* connection_first( ber_socket_t *index )
 907 {
 908         assert( connections != NULL );
 909         assert( index != NULL );
 910
 911         ldap_pvt_thread_mutex_lock( &connections_mutex );
 912         for( *index = 0; *index < dtblsize; (*index)++) {
 913                 if( connections[*index].c_struct_state != SLAP_C_UNINITIALIZED ) {
 914                         break;
 915                 }
 916         }
 917         ldap_pvt_thread_mutex_unlock( &connections_mutex );
 918
 919         return connection_next(NULL, index);
 920 }
 921
 922 Connection* connection_next( Connection *c, ber_socket_t *index )
 923 {
 924         assert( connections != NULL );
 925         assert( index != NULL );
 926         assert( *index <= dtblsize );
 927
 928         if( c != NULL ) ldap_pvt_thread_mutex_unlock( &c->c_mutex );
 929
 930         c = NULL;
 931
 932         ldap_pvt_thread_mutex_lock( &connections_mutex );
 933         for(; *index < dtblsize; (*index)++) {
 934                 int c_struct;
 935                 if( connections[*index].c_struct_state == SLAP_C_UNINITIALIZED ) {
 936                         assert( connections[*index].c_conn_state == SLAP_C_INVALID );
 937 #ifdef HAVE_WINSOCK
 938                         break;
 939 #else
 940                         continue;
 941 #endif
 942                 }
 943
 944                 if( connections[*index].c_struct_state == SLAP_C_USED ) {
 945                         assert( connections[*index].c_conn_state != SLAP_C_INVALID );
 946                         c = &connections[(*index)++];
 947                         if ( ldap_pvt_thread_mutex_trylock( &c->c_mutex )) {
 948                                 /* avoid deadlock */
 949                                 ldap_pvt_thread_mutex_unlock( &connections_mutex );
 950                                 ldap_pvt_thread_mutex_lock( &c->c_mutex );
 951                                 ldap_pvt_thread_mutex_lock( &connections_mutex );
 952                                 if ( c->c_struct_state != SLAP_C_USED ) {
 953                                         ldap_pvt_thread_mutex_unlock( &c->c_mutex );
 954                                         c = NULL;
 955                                         continue;
 956                                 }
 957                         }
 958                         break;
 959                 }
 960
 961                 c_struct = connections[*index].c_struct_state;
 962                 if ( c_struct == SLAP_C_PENDING )
 963                         continue;
 964                 assert( c_struct == SLAP_C_UNUSED );
 965                 assert( connections[*index].c_conn_state == SLAP_C_INVALID );
 966         }
 967
 968         ldap_pvt_thread_mutex_unlock( &connections_mutex );
 969         return c;
 970 }
 971
 972 void connection_done( Connection *c )
 973 {
 974         assert( connections != NULL );
 975
 976         if( c != NULL ) ldap_pvt_thread_mutex_unlock( &c->c_mutex );
 977 }
 978
 979 /*
 980  * connection_activity - handle the request operation op on connection
 981  * conn.  This routine figures out what kind of operation it is and
 982  * calls the appropriate stub to handle it.
 983  */
 984
 985 #ifdef SLAPD_MONITOR
 986 /* FIXME: returns 0 in case of failure */
 987 #define INCR_OP_INITIATED(index) \
 988         do { \
 989                 ldap_pvt_thread_mutex_lock( &slap_counters.sc_ops_mutex ); \
 990                 ldap_pvt_mp_add_ulong(slap_counters.sc_ops_initiated_[(index)], 1); \
 991                 ldap_pvt_thread_mutex_unlock( &slap_counters.sc_ops_mutex ); \
 992         } while (0)
 993 #define INCR_OP_COMPLETED(index) \
 994         do { \
 995                 ldap_pvt_thread_mutex_lock( &slap_counters.sc_ops_mutex ); \
 996                 ldap_pvt_mp_add_ulong(slap_counters.sc_ops_completed, 1); \
 997                 ldap_pvt_mp_add_ulong(slap_counters.sc_ops_completed_[(index)], 1); \
 998                 ldap_pvt_thread_mutex_unlock( &slap_counters.sc_ops_mutex ); \
 999         } while (0)
1000 #else /* !SLAPD_MONITOR */
1001 #define INCR_OP_INITIATED(index) do { } while (0)
1002 #define INCR_OP_COMPLETED(index) \
1003         do { \
1004                 ldap_pvt_thread_mutex_lock( &slap_counters.sc_ops_mutex ); \
1005                 ldap_pvt_mp_add_ulong(slap_counters.sc_ops_completed, 1); \
1006                 ldap_pvt_thread_mutex_unlock( &slap_counters.sc_ops_mutex ); \
1007         } while (0)
1008 #endif /* !SLAPD_MONITOR */
1009
1010 /*
1011  * NOTE: keep in sync with enum in slapd.h
1012  */
1013 static BI_op_func *opfun[] = {
1014         do_bind,
1015         do_unbind,
1016         do_add,
1017         do_delete,
1018         do_modrdn,
1019         do_modify,
1020         do_compare,
1021         do_search,
1022         do_abandon,
1023         do_extended,
1024         NULL
1025 };
1026
1027 static void *
1028 connection_operation( void *ctx, void *arg_v )
1029 {
1030         int rc = LDAP_OTHER;
1031         Operation *op = arg_v;
1032         SlapReply rs = {REP_RESULT};
1033         ber_tag_t tag = op->o_tag;
1034         slap_op_t opidx = SLAP_OP_LAST;
1035         Connection *conn = op->o_conn;
1036         void *memctx = NULL;
1037         void *memctx_null = NULL;
1038         ber_len_t memsiz;
1039
1040         ldap_pvt_thread_mutex_lock( &slap_counters.sc_ops_mutex );
1041         /* FIXME: returns 0 in case of failure */
1042         ldap_pvt_mp_add_ulong(slap_counters.sc_ops_initiated, 1);
1043         ldap_pvt_thread_mutex_unlock( &slap_counters.sc_ops_mutex );
1044
1045         op->o_threadctx = ctx;
1046         op->o_tid = ldap_pvt_thread_pool_tid( ctx );
1047
1048         switch ( tag ) {
1049         case LDAP_REQ_BIND:
1050         case LDAP_REQ_UNBIND:
1051         case LDAP_REQ_ADD:
1052         case LDAP_REQ_DELETE:
1053         case LDAP_REQ_MODDN:
1054         case LDAP_REQ_MODIFY:
1055         case LDAP_REQ_COMPARE:
1056         case LDAP_REQ_SEARCH:
1057         case LDAP_REQ_ABANDON:
1058         case LDAP_REQ_EXTENDED:
1059                 break;
1060         default:
1061                 Debug( LDAP_DEBUG_ANY, "connection_operation: "
1062                         "conn %lu unknown LDAP request 0x%lx\n",
1063                         conn->c_connid, tag, 0 );
1064                 op->o_tag = LBER_ERROR;
1065                 rs.sr_err = LDAP_PROTOCOL_ERROR;
1066                 rs.sr_text = "unknown LDAP request";
1067                 send_ldap_disconnect( op, &rs );
1068                 rc = SLAPD_DISCONNECT;
1069                 goto operations_error;
1070         }
1071
1072         if( conn->c_sasl_bind_in_progress && tag != LDAP_REQ_BIND ) {
1073                 Debug( LDAP_DEBUG_ANY, "connection_operation: "
1074                         "error: SASL bind in progress (tag=%ld).\n",
1075                         (long) tag, 0, 0 );
1076                 send_ldap_error( op, &rs, LDAP_OPERATIONS_ERROR,
1077                         "SASL bind in progress" );
1078                 rc = LDAP_OPERATIONS_ERROR;
1079                 goto operations_error;
1080         }
1081
1082 #ifdef LDAP_X_TXN
1083         if (( conn->c_txn == CONN_TXN_SPECIFY ) && (
1084                 ( tag == LDAP_REQ_ADD ) ||
1085                 ( tag == LDAP_REQ_DELETE ) ||
1086                 ( tag == LDAP_REQ_MODIFY ) ||
1087                 ( tag == LDAP_REQ_MODRDN )))
1088         {
1089                 /* Disable SLAB allocator for all update operations
1090                         issued inside of a transaction */
1091                 op->o_tmpmemctx = NULL;
1092                 op->o_tmpmfuncs = &ch_mfuncs;
1093         } else
1094 #endif
1095         {
1096         /* We can use Thread-Local storage for most mallocs. We can
1097          * also use TL for ber parsing, but not on Add or Modify.
1098          */
1099 #if 0
1100         memsiz = ber_len( op->o_ber ) * 64;
1101         if ( SLAP_SLAB_SIZE > memsiz ) memsiz = SLAP_SLAB_SIZE;
1102 #endif
1103         memsiz = SLAP_SLAB_SIZE;
1104
1105         memctx = slap_sl_mem_create( memsiz, SLAP_SLAB_STACK, ctx );
1106         op->o_tmpmemctx = memctx;
1107         op->o_tmpmfuncs = &slap_sl_mfuncs;
1108         if ( tag != LDAP_REQ_ADD && tag != LDAP_REQ_MODIFY ) {
1109                 /* Note - the ber and its buffer are already allocated from
1110                  * regular memory; this only affects subsequent mallocs that
1111                  * ber_scanf may invoke.
1112                  */
1113                 ber_set_option( op->o_ber, LBER_OPT_BER_MEMCTX, &memctx );
1114         }
1115         }
1116
1117         opidx = slap_req2op( tag );
1118         assert( opidx != SLAP_OP_LAST );
1119         INCR_OP_INITIATED( opidx );
1120         rc = (*(opfun[opidx]))( op, &rs );
1121
1122 operations_error:
1123         if ( rc == SLAPD_DISCONNECT ) {
1124                 tag = LBER_ERROR;
1125
1126         } else if ( opidx != SLAP_OP_LAST ) {
1127                 /* increment completed operations count
1128                  * only if operation was initiated
1129                  * and rc != SLAPD_DISCONNECT */
1130                 INCR_OP_COMPLETED( opidx );
1131         }
1132
1133         if ( op->o_cancel == SLAP_CANCEL_REQ ) {
1134                 if ( rc == SLAPD_ABANDON ) {
1135                         op->o_cancel = SLAP_CANCEL_ACK;
1136                 } else {
1137                         op->o_cancel = LDAP_TOO_LATE;
1138                 }
1139         }
1140
1141         while ( op->o_cancel != SLAP_CANCEL_NONE &&
1142                 op->o_cancel != SLAP_CANCEL_DONE )
1143         {
1144                 ldap_pvt_thread_yield();
1145         }
1146
1147         ldap_pvt_thread_mutex_lock( &conn->c_mutex );
1148
1149         ber_set_option( op->o_ber, LBER_OPT_BER_MEMCTX, &memctx_null );
1150
1151         LDAP_STAILQ_REMOVE( &conn->c_ops, op, slap_op, o_next);
1152         LDAP_STAILQ_NEXT(op, o_next) = NULL;
1153         slap_op_free( op );
1154         conn->c_n_ops_executing--;
1155         conn->c_n_ops_completed++;
1156
1157         switch( tag ) {
1158         case LBER_ERROR:
1159         case LDAP_REQ_UNBIND:
1160                 /* c_mutex is locked */
1161                 connection_closing( conn,
1162                         tag == LDAP_REQ_UNBIND ? NULL : "operations error" );
1163                 break;
1164         }
1165
1166         connection_resched( conn );
1167         ldap_pvt_thread_mutex_unlock( &conn->c_mutex );
1168         return NULL;
1169 }
1170
1171 static const Listener dummy_list = { BER_BVC(""), BER_BVC("") };
1172
1173 int connection_client_setup(
1174         ber_socket_t s,
1175         ldap_pvt_thread_start_t *func,
1176         void *arg )
1177 {
1178         int rc;
1179         Connection *c;
1180
1181         rc = connection_init( s, (Listener *)&dummy_list, "", "",
1182                 CONN_IS_CLIENT, 0, NULL );
1183         if ( rc < 0 ) return -1;
1184
1185         c = connection_get( s );
1186         c->c_clientfunc = func;
1187         c->c_clientarg = arg;
1188
1189         slapd_add_internal( s, 0 );
1190         slapd_set_read( s, 1 );
1191         connection_return( c );
1192         return 0;
1193 }
1194
1195 void connection_client_enable(
1196         ber_socket_t s )
1197 {
1198         slapd_set_read( s, 1 );
1199 }
1200
1201 void connection_client_stop(
1202         ber_socket_t s )
1203 {
1204         Connection *c;
1205         Sockbuf *sb;
1206
1207         /* get (locked) connection */
1208         c = connection_get( s );
1209
1210         assert( c->c_conn_state == SLAP_C_CLIENT );
1211
1212         c->c_listener = NULL;
1213         c->c_conn_state = SLAP_C_INVALID;
1214         c->c_struct_state = SLAP_C_UNUSED;
1215         c->c_close_reason = "?";                        /* should never be needed */
1216         sb = c->c_sb;
1217         c->c_sb = ber_sockbuf_alloc( );
1218         {
1219                 ber_len_t max = sockbuf_max_incoming;
1220                 ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_SET_MAX_INCOMING, &max );
1221         }
1222         slapd_remove( s, sb, 0, 1, 0 );
1223
1224         connection_return( c );
1225 }
1226
1227 #ifdef SLAP_LIGHTWEIGHT_DISPATCHER
1228
1229 static int connection_read( ber_socket_t s, conn_readinfo *cri );
1230
1231 static void* connection_read_thread( void* ctx, void* argv )
1232 {
1233         int rc ;
1234         conn_readinfo cri = { NULL, NULL, NULL, 0 };
1235         ber_socket_t s = (long)argv;
1236
1237         /*
1238          * read incoming LDAP requests. If there is more than one,
1239          * the first one is returned with new_op
1240          */
1241         if( ( rc = connection_read( s, &cri ) ) < 0 ) {
1242                 Debug( LDAP_DEBUG_CONNS, "connection_read(%d) error\n", s, 0, 0 );
1243                 return (void*)(long)rc;
1244         }
1245
1246         /* execute a single queued request in the same thread */
1247         if( cri.op && !cri.nullop ) {
1248                 rc = (long)connection_operation( ctx, cri.op );
1249         } else if ( cri.func ) {
1250                 rc = (long)cri.func( ctx, cri.arg );
1251         }
1252
1253         return (void*)(long)rc;
1254 }
1255
1256 int connection_read_activate( ber_socket_t s )
1257 {
1258         int rc;
1259
1260         /*
1261          * suspend reading on this file descriptor until a connection processing
1262          * thread reads data on it. Otherwise the listener thread will repeatedly
1263          * submit the same event on it to the pool.
1264          */
1265         rc = slapd_clr_read( s, 0 );
1266         if ( rc )
1267                 return rc;
1268
1269         rc = ldap_pvt_thread_pool_submit( &connection_pool,
1270                 connection_read_thread, (void *)(long)s );
1271
1272         if( rc != 0 ) {
1273                 Debug( LDAP_DEBUG_ANY,
1274                         "connection_read_activate(%d): submit failed (%d)\n",
1275                         s, rc, 0 );
1276         }
1277
1278         return rc;
1279 }
1280 #endif
1281
1282 #ifdef SLAP_LIGHTWEIGHT_DISPATCHER
1283 static int
1284 connection_read( ber_socket_t s, conn_readinfo *cri )
1285 #else
1286 int connection_read(ber_socket_t s)
1287 #endif
1288 {
1289         int rc = 0;
1290         Connection *c;
1291
1292         assert( connections != NULL );
1293
1294         /* get (locked) connection */
1295         c = connection_get( s );
1296
1297         if( c == NULL ) {
1298                 Debug( LDAP_DEBUG_ANY,
1299                         "connection_read(%ld): no connection!\n",
1300                         (long) s, 0, 0 );
1301
1302                 return -1;
1303         }
1304
1305         c->c_n_read++;
1306
1307         if( c->c_conn_state == SLAP_C_CLOSING ) {
1308                 Debug( LDAP_DEBUG_TRACE,
1309                         "connection_read(%d): closing, ignoring input for id=%lu\n",
1310                         s, c->c_connid, 0 );
1311                 connection_return( c );
1312                 return 0;
1313         }
1314
1315         if ( c->c_conn_state == SLAP_C_CLIENT ) {
1316 #ifdef SLAP_LIGHTWEIGHT_DISPATCHER
1317                 cri->func = c->c_clientfunc;
1318                 cri->arg = c->c_clientarg;
1319                 /* read should already be cleared */
1320 #else
1321                 slapd_clr_read( s, 0 );
1322                 ldap_pvt_thread_pool_submit( &connection_pool,
1323                         c->c_clientfunc, c->c_clientarg );
1324 #endif
1325                 connection_return( c );
1326                 return 0;
1327         }
1328
1329         Debug( LDAP_DEBUG_TRACE,
1330                 "connection_read(%d): checking for input on id=%lu\n",
1331                 s, c->c_connid, 0 );
1332
1333 #ifdef HAVE_TLS
1334         if ( c->c_is_tls && c->c_needs_tls_accept ) {
1335                 rc = ldap_pvt_tls_accept( c->c_sb, slap_tls_ctx );
1336                 if ( rc < 0 ) {
1337                         Debug( LDAP_DEBUG_TRACE,
1338                                 "connection_read(%d): TLS accept failure "
1339                                 "error=%d id=%lu, closing\n",
1340                                 s, rc, c->c_connid );
1341
1342                         c->c_needs_tls_accept = 0;
1343                         /* c_mutex is locked */
1344                         connection_closing( c, "TLS negotiation failure" );
1345                         connection_close( c );
1346                         connection_return( c );
1347                         return 0;
1348
1349                 } else if ( rc == 0 ) {
1350                         void *ssl;
1351                         struct berval authid = BER_BVNULL;
1352
1353                         c->c_needs_tls_accept = 0;
1354
1355                         /* we need to let SASL know */
1356                         ssl = ldap_pvt_tls_sb_ctx( c->c_sb );
1357
1358                         c->c_tls_ssf = (slap_ssf_t) ldap_pvt_tls_get_strength( ssl );
1359                         if( c->c_tls_ssf > c->c_ssf ) {
1360                                 c->c_ssf = c->c_tls_ssf;
1361                         }
1362
1363                         rc = dnX509peerNormalize( ssl, &authid );
1364                         if ( rc != LDAP_SUCCESS ) {
1365                                 Debug( LDAP_DEBUG_TRACE, "connection_read(%d): "
1366                                         "unable to get TLS client DN, error=%d id=%lu\n",
1367                                         s, rc, c->c_connid );
1368                         }
1369                         Statslog( LDAP_DEBUG_STATS,
1370                                 "conn=%lu fd=%d TLS established tls_ssf=%u ssf=%u\n",
1371                             c->c_connid, (int) s, c->c_tls_ssf, c->c_ssf, 0 );
1372                         slap_sasl_external( c, c->c_tls_ssf, &authid );
1373                         if ( authid.bv_val ) free( authid.bv_val );
1374                 }
1375
1376                 /* if success and data is ready, fall thru to data input loop */
1377                 if( !ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_DATA_READY, NULL ) )
1378                 {
1379 #ifdef SLAP_LIGHTWEIGHT_DISPATCHER
1380                         slapd_set_read( s, 1 );
1381 #endif
1382
1383                         connection_return( c );
1384                         return 0;
1385                 }
1386         }
1387 #endif
1388
1389 #ifdef HAVE_CYRUS_SASL
1390         if ( c->c_sasl_layers ) {
1391                 /* If previous layer is not removed yet, give up for now */
1392                 if ( !c->c_sasl_sockctx ) {
1393 #ifdef SLAP_LIGHTWEIGHT_DISPATCHER
1394                         slapd_set_read( s, 1 );
1395 #endif
1396
1397                         connection_return( c );
1398                         return 0;
1399                 }
1400
1401                 c->c_sasl_layers = 0;
1402
1403                 rc = ldap_pvt_sasl_install( c->c_sb, c->c_sasl_sockctx );
1404                 if( rc != LDAP_SUCCESS ) {
1405                         Debug( LDAP_DEBUG_TRACE,
1406                                 "connection_read(%d): SASL install error "
1407                                 "error=%d id=%lu, closing\n",
1408                                 s, rc, c->c_connid );
1409
1410                         /* c_mutex is locked */
1411                         connection_closing( c, "SASL layer install failure" );
1412                         connection_close( c );
1413                         connection_return( c );
1414                         return 0;
1415                 }
1416         }
1417 #endif
1418
1419 #define CONNECTION_INPUT_LOOP 1
1420 /* #define      DATA_READY_LOOP 1 */
1421
1422         do {
1423                 /* How do we do this without getting into a busy loop ? */
1424 #ifdef SLAP_LIGHTWEIGHT_DISPATCHER
1425                 rc = connection_input( c, cri );
1426 #else
1427                 rc = connection_input( c );
1428 #endif
1429         }
1430 #ifdef DATA_READY_LOOP
1431         while( !rc && ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_DATA_READY, NULL ));
1432 #elif CONNECTION_INPUT_LOOP
1433         while(!rc);
1434 #else
1435         while(0);
1436 #endif
1437
1438         if( rc < 0 ) {
1439                 Debug( LDAP_DEBUG_CONNS,
1440                         "connection_read(%d): input error=%d id=%lu, closing.\n",
1441                         s, rc, c->c_connid );
1442
1443                 /* c_mutex is locked */
1444                 connection_closing( c, conn_lost_str );
1445                 connection_close( c );
1446                 connection_return( c );
1447                 return 0;
1448         }
1449
1450 #ifdef SLAP_LIGHTWEIGHT_DISPATCHER
1451         if ( ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_NEEDS_WRITE, NULL ) ) {
1452                 slapd_set_write( s, 0 );
1453         }
1454
1455         slapd_set_read( s, 1 );
1456 #else
1457         if ( ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_NEEDS_READ, NULL ) ) {
1458                 slapd_set_read( s, 1 );
1459         }
1460
1461         if ( ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_NEEDS_WRITE, NULL ) ) {
1462                 slapd_set_write( s, 1 );
1463         }
1464 #endif
1465
1466         connection_return( c );
1467
1468         return 0;
1469 }
1470
1471 static int
1472 #ifdef SLAP_LIGHTWEIGHT_DISPATCHER
1473 connection_input( Connection *conn , conn_readinfo *cri )
1474 #else
1475 connection_input( Connection *conn )
1476 #endif
1477 {
1478         Operation *op;
1479         ber_tag_t       tag;
1480         ber_len_t       len;
1481         ber_int_t       msgid;
1482         BerElement      *ber;
1483         int             rc;
1484 #ifdef LDAP_CONNECTIONLESS
1485         Sockaddr        peeraddr;
1486         char            *cdn = NULL;
1487 #endif
1488         char *defer = NULL;
1489
1490         if ( conn->c_currentber == NULL &&
1491                 ( conn->c_currentber = ber_alloc()) == NULL )
1492         {
1493                 Debug( LDAP_DEBUG_ANY, "ber_alloc failed\n", 0, 0, 0 );
1494                 return -1;
1495         }
1496
1497         sock_errset(0);
1498
1499 #ifdef LDAP_CONNECTIONLESS
1500         if ( conn->c_is_udp ) {
1501                 char peername[sizeof("IP=255.255.255.255:65336")];
1502
1503                 len = ber_int_sb_read(conn->c_sb, &peeraddr, sizeof(struct sockaddr));
1504                 if (len != sizeof(struct sockaddr)) return 1;
1505
1506                 sprintf( peername, "IP=%s:%d",
1507                         inet_ntoa( peeraddr.sa_in_addr.sin_addr ),
1508                         (unsigned) ntohs( peeraddr.sa_in_addr.sin_port ) );
1509                 Statslog( LDAP_DEBUG_STATS,
1510                         "conn=%lu UDP request from %s (%s) accepted.\n",
1511                         conn->c_connid, peername, conn->c_sock_name.bv_val, 0, 0 );
1512         }
1513 #endif
1514
1515         tag = ber_get_next( conn->c_sb, &len, conn->c_currentber );
1516         if ( tag != LDAP_TAG_MESSAGE ) {
1517                 int err = sock_errno();
1518                 ber_socket_t    sd;
1519
1520                 ber_sockbuf_ctrl( conn->c_sb, LBER_SB_OPT_GET_FD, &sd );
1521
1522                 Debug( LDAP_DEBUG_TRACE,
1523                         "ber_get_next on fd %d failed errno=%d (%s)\n",
1524                         sd, err, sock_errstr(err) );
1525                 if ( err != EWOULDBLOCK && err != EAGAIN ) {
1526                         /* log, close and send error */
1527                         ber_free( conn->c_currentber, 1 );
1528                         conn->c_currentber = NULL;
1529
1530                         return -2;
1531                 }
1532                 return 1;
1533         }
1534
1535         ber = conn->c_currentber;
1536         conn->c_currentber = NULL;
1537
1538         if ( (tag = ber_get_int( ber, &msgid )) != LDAP_TAG_MSGID ) {
1539                 /* log, close and send error */
1540                 Debug( LDAP_DEBUG_ANY, "ber_get_int returns 0x%lx\n", tag, 0, 0 );
1541                 ber_free( ber, 1 );
1542                 return -1;
1543         }
1544
1545         if ( (tag = ber_peek_tag( ber, &len )) == LBER_ERROR ) {
1546                 /* log, close and send error */
1547                 Debug( LDAP_DEBUG_ANY, "ber_peek_tag returns 0x%lx\n", tag, 0, 0 );
1548                 ber_free( ber, 1 );
1549
1550                 return -1;
1551         }
1552
1553 #ifdef LDAP_CONNECTIONLESS
1554         if( conn->c_is_udp ) {
1555                 if( tag == LBER_OCTETSTRING ) {
1556                         ber_get_stringa( ber, &cdn );
1557                         tag = ber_peek_tag(ber, &len);
1558                 }
1559                 if( tag != LDAP_REQ_ABANDON && tag != LDAP_REQ_SEARCH ) {
1560                         Debug( LDAP_DEBUG_ANY, "invalid req for UDP 0x%lx\n", tag, 0, 0 );
1561                         ber_free( ber, 1 );
1562                         return 0;
1563                 }
1564         }
1565 #endif
1566
1567         if(tag == LDAP_REQ_BIND) {
1568                 /* immediately abandon all existing operations upon BIND */
1569                 connection_abandon( conn );
1570         }
1571
1572         op = slap_op_alloc( ber, msgid, tag, conn->c_n_ops_received++ );
1573
1574         op->o_conn = conn;
1575         /* clear state if the connection is being reused from inactive */
1576         if ( conn->c_conn_state == SLAP_C_INACTIVE ) {
1577                 memset( &conn->c_pagedresults_state, 0,
1578                         sizeof( conn->c_pagedresults_state ) );
1579         }
1580
1581         op->o_res_ber = NULL;
1582
1583 #ifdef LDAP_CONNECTIONLESS
1584         if (conn->c_is_udp) {
1585                 if ( cdn ) {
1586                         ber_str2bv( cdn, 0, 1, &op->o_dn );
1587                         op->o_protocol = LDAP_VERSION2;
1588                 }
1589                 op->o_res_ber = ber_alloc_t( LBER_USE_DER );
1590                 if (op->o_res_ber == NULL) return 1;
1591
1592                 rc = ber_write( op->o_res_ber, (char *)&peeraddr,
1593                         sizeof(struct sockaddr), 0 );
1594
1595                 if (rc != sizeof(struct sockaddr)) {
1596                         Debug( LDAP_DEBUG_ANY, "ber_write failed\n", 0, 0, 0 );
1597                         return 1;
1598                 }
1599
1600                 if (op->o_protocol == LDAP_VERSION2) {
1601                         rc = ber_printf(op->o_res_ber, "{is{" /*}}*/, op->o_msgid, "");
1602                         if (rc == -1) {
1603                                 Debug( LDAP_DEBUG_ANY, "ber_write failed\n", 0, 0, 0 );
1604                                 return rc;
1605                         }
1606                 }
1607         }
1608 #endif /* LDAP_CONNECTIONLESS */
1609
1610         rc = 0;
1611
1612         /* Don't process requests when the conn is in the middle of a
1613          * Bind, or if it's closing. Also, don't let any single conn
1614          * use up all the available threads, and don't execute if we're
1615          * currently blocked on output. And don't execute if there are
1616          * already pending ops, let them go first.  Abandon operations
1617          * get exceptions to some, but not all, cases.
1618          */
1619         switch( tag ){
1620         default:
1621                 /* Abandon and Unbind are exempt from these checks */
1622                 if (conn->c_conn_state == SLAP_C_CLOSING) {
1623                         defer = "closing";
1624                         break;
1625                 } else if (conn->c_writewaiter) {
1626                         defer = "awaiting write";
1627                         break;
1628                 } else if (conn->c_n_ops_pending) {
1629                         defer = "pending operations";
1630                         break;
1631                 }
1632                 /* FALLTHRU */
1633         case LDAP_REQ_ABANDON:
1634                 /* Unbind is exempt from these checks */
1635                 if (conn->c_n_ops_executing >= connection_pool_max/2) {
1636                         defer = "too many executing";
1637                         break;
1638                 } else if (conn->c_conn_state == SLAP_C_BINDING) {
1639                         defer = "binding";
1640                         break;
1641                 }
1642                 /* FALLTHRU */
1643         case LDAP_REQ_UNBIND:
1644                 break;
1645         }
1646
1647         if( defer ) {
1648                 int max = conn->c_dn.bv_len
1649                         ? slap_conn_max_pending_auth
1650                         : slap_conn_max_pending;
1651
1652                 Debug( LDAP_DEBUG_ANY,
1653                         "connection_input: conn=%lu deferring operation: %s\n",
1654                         conn->c_connid, defer, 0 );
1655                 conn->c_n_ops_pending++;
1656                 LDAP_STAILQ_INSERT_TAIL( &conn->c_pending_ops, op, o_next );
1657                 rc = ( conn->c_n_ops_pending > max ) ? -1 : 0;
1658
1659         } else {
1660                 conn->c_n_ops_executing++;
1661
1662 #ifdef SLAP_LIGHTWEIGHT_DISPATCHER
1663                 /*
1664                  * The first op will be processed in the same thread context,
1665                  * as long as there is only one op total.
1666                  * Subsequent ops will be submitted to the pool by
1667                  * calling connection_op_activate()
1668                  */
1669                 if ( cri->op == NULL ) {
1670                         /* the first incoming request */
1671                         connection_op_queue( op );
1672                         cri->op = op;
1673                 } else {
1674                         if ( !cri->nullop ) {
1675                                 cri->nullop = 1;
1676                                 rc = ldap_pvt_thread_pool_submit( &connection_pool,
1677                                         connection_operation, (void *) cri->op );
1678                         }
1679                         connection_op_activate( op );
1680                 }
1681 #else
1682                 connection_op_activate( op );
1683 #endif
1684         }
1685
1686 #ifdef NO_THREADS
1687         if ( conn->c_struct_state != SLAP_C_USED ) {
1688                 /* connection must have got closed underneath us */
1689                 return 1;
1690         }
1691 #endif
1692
1693         assert( conn->c_struct_state == SLAP_C_USED );
1694         return rc;
1695 }
1696
1697 static int
1698 connection_resched( Connection *conn )
1699 {
1700         Operation *op;
1701
1702         if( conn->c_conn_state == SLAP_C_CLOSING ) {
1703                 ber_socket_t    sd;
1704                 ber_sockbuf_ctrl( conn->c_sb, LBER_SB_OPT_GET_FD, &sd );
1705
1706                 Debug( LDAP_DEBUG_TRACE, "connection_resched: "
1707                         "attempting closing conn=%lu sd=%d\n",
1708                         conn->c_connid, sd, 0 );
1709                 connection_close( conn );
1710                 return 0;
1711         }
1712
1713         if( conn->c_conn_state != SLAP_C_ACTIVE || conn->c_writewaiter ) {
1714                 /* other states need different handling */
1715                 return 0;
1716         }
1717
1718         while ((op = LDAP_STAILQ_FIRST( &conn->c_pending_ops )) != NULL) {
1719                 if ( conn->c_n_ops_executing > connection_pool_max/2 ) break;
1720
1721                 LDAP_STAILQ_REMOVE_HEAD( &conn->c_pending_ops, o_next );
1722                 LDAP_STAILQ_NEXT(op, o_next) = NULL;
1723
1724                 /* pending operations should not be marked for abandonment */
1725                 assert(!op->o_abandon);
1726
1727                 conn->c_n_ops_pending--;
1728                 conn->c_n_ops_executing++;
1729
1730                 connection_op_activate( op );
1731
1732                 if ( conn->c_conn_state == SLAP_C_BINDING ) break;
1733         }
1734         return 0;
1735 }
1736
1737 static void
1738 connection_init_log_prefix( Operation *op )
1739 {
1740         if ( op->o_connid == (unsigned long)(-1) ) {
1741                 snprintf( op->o_log_prefix, sizeof( op->o_log_prefix ),
1742                         "conn=-1 op=%lu", op->o_opid );
1743
1744         } else {
1745                 snprintf( op->o_log_prefix, sizeof( op->o_log_prefix ),
1746                         "conn=%lu op=%lu", op->o_connid, op->o_opid );
1747         }
1748 }
1749
1750 static int connection_bind_cleanup_cb( Operation *op, SlapReply *rs )
1751 {
1752         op->o_conn->c_sasl_bindop = NULL;
1753
1754         ch_free( op->o_callback );
1755         op->o_callback = NULL;
1756
1757         return SLAP_CB_CONTINUE;
1758 }
1759
1760 static int connection_bind_cb( Operation *op, SlapReply *rs )
1761 {
1762         ldap_pvt_thread_mutex_lock( &op->o_conn->c_mutex );
1763         if ( op->o_conn->c_conn_state == SLAP_C_BINDING )
1764                 op->o_conn->c_conn_state = SLAP_C_ACTIVE;
1765         op->o_conn->c_sasl_bind_in_progress =
1766                 ( rs->sr_err == LDAP_SASL_BIND_IN_PROGRESS );
1767
1768         /* Moved here from bind.c due to ITS#4158 */
1769         op->o_conn->c_sasl_bindop = NULL;
1770         if ( op->orb_method == LDAP_AUTH_SASL ) {
1771                 if( rs->sr_err == LDAP_SUCCESS ) {
1772                         ber_dupbv(&op->o_conn->c_dn, &op->orb_edn);
1773                         if( !BER_BVISEMPTY( &op->orb_edn ) ) {
1774                                 /* edn is always normalized already */
1775                                 ber_dupbv( &op->o_conn->c_ndn, &op->o_conn->c_dn );
1776                         }
1777                         op->o_tmpfree( op->orb_edn.bv_val, op->o_tmpmemctx );
1778                         BER_BVZERO( &op->orb_edn );
1779                         op->o_conn->c_authmech = op->o_conn->c_sasl_bind_mech;
1780                         BER_BVZERO( &op->o_conn->c_sasl_bind_mech );
1781
1782                         op->o_conn->c_sasl_ssf = op->orb_ssf;
1783                         if( op->orb_ssf > op->o_conn->c_ssf ) {
1784                                 op->o_conn->c_ssf = op->orb_ssf;
1785                         }
1786
1787                         if( !BER_BVISEMPTY( &op->o_conn->c_dn ) ) {
1788                                 ber_len_t max = sockbuf_max_incoming_auth;
1789                                 ber_sockbuf_ctrl( op->o_conn->c_sb,
1790                                         LBER_SB_OPT_SET_MAX_INCOMING, &max );
1791                         }
1792
1793                         /* log authorization identity */
1794                         Statslog( LDAP_DEBUG_STATS,
1795                                 "%s BIND dn=\"%s\" mech=%s ssf=%d\n",
1796                                 op->o_log_prefix,
1797                                 BER_BVISNULL( &op->o_conn->c_dn ) ? "<empty>" : op->o_conn->c_dn.bv_val,
1798                                 op->o_conn->c_authmech.bv_val, op->orb_ssf, 0 );
1799
1800                         Debug( LDAP_DEBUG_TRACE,
1801                                 "do_bind: SASL/%s bind: dn=\"%s\" ssf=%d\n",
1802                                 op->o_conn->c_authmech.bv_val,
1803                                 BER_BVISNULL( &op->o_conn->c_dn ) ? "<empty>" : op->o_conn->c_dn.bv_val,
1804                                 op->orb_ssf );
1805
1806                 } else if ( rs->sr_err != LDAP_SASL_BIND_IN_PROGRESS ) {
1807                         if ( !BER_BVISNULL( &op->o_conn->c_sasl_bind_mech ) ) {
1808                                 free( op->o_conn->c_sasl_bind_mech.bv_val );
1809                                 BER_BVZERO( &op->o_conn->c_sasl_bind_mech );
1810                         }
1811                 }
1812         }
1813         ldap_pvt_thread_mutex_unlock( &op->o_conn->c_mutex );
1814
1815         ch_free( op->o_callback );
1816         op->o_callback = NULL;
1817
1818         return SLAP_CB_CONTINUE;
1819 }
1820
1821 static void connection_op_queue( Operation *op )
1822 {
1823         ber_tag_t tag = op->o_tag;
1824
1825         if (tag == LDAP_REQ_BIND) {
1826                 slap_callback *sc = ch_calloc( 1, sizeof( slap_callback ));
1827                 sc->sc_response = connection_bind_cb;
1828                 sc->sc_cleanup = connection_bind_cleanup_cb;
1829                 sc->sc_next = op->o_callback;
1830                 op->o_callback = sc;
1831                 op->o_conn->c_conn_state = SLAP_C_BINDING;
1832         }
1833
1834         if (!op->o_dn.bv_len) {
1835                 op->o_authz = op->o_conn->c_authz;
1836                 if ( BER_BVISNULL( &op->o_conn->c_sasl_authz_dn )) {
1837                         ber_dupbv( &op->o_dn, &op->o_conn->c_dn );
1838                         ber_dupbv( &op->o_ndn, &op->o_conn->c_ndn );
1839                 } else {
1840                         ber_dupbv( &op->o_dn, &op->o_conn->c_sasl_authz_dn );
1841                         ber_dupbv( &op->o_ndn, &op->o_conn->c_sasl_authz_dn );
1842                 }
1843         }
1844
1845         op->o_authtype = op->o_conn->c_authtype;
1846         ber_dupbv( &op->o_authmech, &op->o_conn->c_authmech );
1847
1848         if (!op->o_protocol) {
1849                 op->o_protocol = op->o_conn->c_protocol
1850                         ? op->o_conn->c_protocol : LDAP_VERSION3;
1851         }
1852
1853         if (op->o_conn->c_conn_state == SLAP_C_INACTIVE &&
1854                 op->o_protocol > LDAP_VERSION2)
1855         {
1856                 op->o_conn->c_conn_state = SLAP_C_ACTIVE;
1857         }
1858
1859         op->o_connid = op->o_conn->c_connid;
1860         connection_init_log_prefix( op );
1861
1862         LDAP_STAILQ_INSERT_TAIL( &op->o_conn->c_ops, op, o_next );
1863 }
1864
1865 static int connection_op_activate( Operation *op )
1866 {
1867         int rc;
1868
1869         connection_op_queue( op );
1870
1871         rc = ldap_pvt_thread_pool_submit( &connection_pool,
1872                 connection_operation, (void *) op );
1873
1874         if ( rc != 0 ) {
1875                 Debug( LDAP_DEBUG_ANY,
1876                         "connection_op_activate: submit failed (%d) for conn=%lu\n",
1877                         rc, op->o_connid, 0 );
1878                 /* should move op to pending list */
1879         }
1880
1881         return rc;
1882 }
1883
1884 int connection_write(ber_socket_t s)
1885 {
1886         Connection *c;
1887         Operation *op;
1888
1889         assert( connections != NULL );
1890
1891         slapd_clr_write( s, 0 );
1892
1893         c = connection_get( s );
1894         if( c == NULL ) {
1895                 Debug( LDAP_DEBUG_ANY,
1896                         "connection_write(%ld): no connection!\n",
1897                         (long)s, 0, 0 );
1898                 return -1;
1899         }
1900
1901         c->c_n_write++;
1902
1903         Debug( LDAP_DEBUG_TRACE,
1904                 "connection_write(%d): waking output for id=%lu\n",
1905                 s, c->c_connid, 0 );
1906         ldap_pvt_thread_cond_signal( &c->c_write_cv );
1907
1908         if ( ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_NEEDS_READ, NULL ) ) {
1909                 slapd_set_read( s, 1 );
1910         }
1911         if ( ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_NEEDS_WRITE, NULL ) ) {
1912                 slapd_set_write( s, 1 );
1913         }
1914
1915         /* If there are ops pending because of a writewaiter,
1916          * start one up.
1917          */
1918         while ((op = LDAP_STAILQ_FIRST( &c->c_pending_ops )) != NULL) {
1919                 if ( !c->c_writewaiter ) break;
1920                 if ( c->c_n_ops_executing > connection_pool_max/2 ) break;
1921
1922                 LDAP_STAILQ_REMOVE_HEAD( &c->c_pending_ops, o_next );
1923                 LDAP_STAILQ_NEXT(op, o_next) = NULL;
1924
1925                 /* pending operations should not be marked for abandonment */
1926                 assert(!op->o_abandon);
1927
1928                 c->c_n_ops_pending--;
1929                 c->c_n_ops_executing++;
1930
1931                 connection_op_activate( op );
1932
1933                 break;
1934         }
1935
1936         connection_return( c );
1937         return 0;
1938 }
1939
1940 void
1941 connection_fake_init(
1942         Connection *conn,
1943         Operation *op,
1944         void *ctx )
1945 {
1946         conn->c_connid = -1;
1947         conn->c_send_ldap_result = slap_send_ldap_result;
1948         conn->c_send_search_entry = slap_send_search_entry;
1949         conn->c_send_search_reference = slap_send_search_reference;
1950         conn->c_listener = (Listener *)&dummy_list;
1951         conn->c_peer_domain = slap_empty_bv;
1952         conn->c_peer_name = slap_empty_bv;
1953
1954         memset(op, 0, OPERATION_BUFFER_SIZE);
1955         op->o_hdr = (Opheader *)(op+1);
1956         op->o_controls = (void **)(op->o_hdr+1);
1957         /* set memory context */
1958         op->o_tmpmemctx = slap_sl_mem_create(SLAP_SLAB_SIZE, SLAP_SLAB_STACK, ctx);
1959         op->o_tmpmfuncs = &slap_sl_mfuncs;
1960         op->o_threadctx = ctx;
1961         op->o_tid = ldap_pvt_thread_pool_tid( ctx );
1962
1963         op->o_conn = conn;
1964         op->o_connid = op->o_conn->c_connid;
1965         connection_init_log_prefix( op );
1966
1967 #ifdef LDAP_SLAPI
1968         slapi_int_create_object_extensions( SLAPI_X_EXT_CONNECTION, conn );
1969         slapi_int_create_object_extensions( SLAPI_X_EXT_OPERATION, op );
1970 #endif /* LDAP_SLAPI */
1971
1972         slap_op_time( &op->o_time, &op->o_tincr );
1973 }
1974
1975 void
1976 connection_assign_nextid( Connection *conn )
1977 {
1978         ldap_pvt_thread_mutex_lock( &conn_nextid_mutex );
1979         conn->c_connid = conn_nextid++;
1980         ldap_pvt_thread_mutex_unlock( &conn_nextid_mutex );
1981 }