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 1998-2007 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_UNINITIALIZED ) {
 200                         ldap_pvt_thread_mutex_lock( &connections[i].c_mutex );
 201                         if( connections[i].c_struct_state == SLAP_C_USED ) {
 202
 203                                 /* give persistent clients a chance to cleanup */
 204                                 if( connections[i].c_conn_state == SLAP_C_CLIENT ) {
 205                                         ldap_pvt_thread_pool_submit( &connection_pool,
 206                                         connections[i].c_clientfunc, connections[i].c_clientarg );
 207                                 } else {
 208                                         /* c_mutex is locked */
 209                                         connection_closing( &connections[i], "slapd shutdown" );
 210                                         connection_close( &connections[i] );
 211                                 }
 212                         }
 213                         ldap_pvt_thread_mutex_unlock( &connections[i].c_mutex );
 214                 }
 215         }
 216
 217         return 0;
 218 }
 219
 220 /*
 221  * Timeout idle connections.
 222  */
 223 int connections_timeout_idle(time_t now)
 224 {
 225         int i = 0;
 226         int connindex;
 227         Connection* c;
 228
 229         for( c = connection_first( &connindex );
 230                 c != NULL;
 231                 c = connection_next( c, &connindex ) )
 232         {
 233                 /* Don't timeout a slow-running request or a persistent
 234                  * outbound connection */
 235                 if( c->c_n_ops_executing || c->c_conn_state == SLAP_C_CLIENT ) {
 236                         continue;
 237                 }
 238
 239                 if( difftime( c->c_activitytime+global_idletimeout, now) < 0 ) {
 240                         /* close it */
 241                         connection_closing( c, "idletimeout" );
 242                         connection_close( c );
 243                         i++;
 244                 }
 245         }
 246         connection_done( c );
 247
 248         return i;
 249 }
 250
 251 static Connection* connection_get( ber_socket_t s )
 252 {
 253         Connection *c;
 254
 255         Debug( LDAP_DEBUG_ARGS,
 256                 "connection_get(%ld)\n",
 257                 (long) s, 0, 0 );
 258
 259         assert( connections != NULL );
 260
 261         if(s == AC_SOCKET_INVALID) return NULL;
 262
 263 #ifndef HAVE_WINSOCK
 264         assert( s < dtblsize );
 265         c = &connections[s];
 266
 267 #else
 268         c = NULL;
 269         {
 270                 ber_socket_t i, sd;
 271
 272                 ldap_pvt_thread_mutex_lock( &connections_mutex );
 273                 for(i=0; i<dtblsize; i++) {
 274                         if( connections[i].c_struct_state == SLAP_C_PENDING )
 275                                 continue;
 276
 277                         if( connections[i].c_struct_state == SLAP_C_UNINITIALIZED ) {
 278                                 assert( connections[i].c_conn_state == SLAP_C_INVALID );
 279                                 assert( connections[i].c_sb == 0 );
 280                                 break;
 281                         }
 282
 283                         ber_sockbuf_ctrl( connections[i].c_sb,
 284                                 LBER_SB_OPT_GET_FD, &sd );
 285
 286                         if( connections[i].c_struct_state == SLAP_C_UNUSED ) {
 287                                 assert( connections[i].c_conn_state == SLAP_C_INVALID );
 288                                 assert( sd == AC_SOCKET_INVALID );
 289                                 continue;
 290                         }
 291
 292                         /* state can actually change from used -> unused by resched,
 293                          * so don't assert details here.
 294                          */
 295
 296                         if( sd == s ) {
 297                                 c = &connections[i];
 298                                 break;
 299                         }
 300                 }
 301                 ldap_pvt_thread_mutex_unlock( &connections_mutex );
 302         }
 303 #endif
 304
 305         if( c != NULL ) {
 306                 ber_socket_t    sd;
 307
 308                 ldap_pvt_thread_mutex_lock( &c->c_mutex );
 309
 310                 assert( c->c_struct_state != SLAP_C_UNINITIALIZED );
 311
 312                 ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_GET_FD, &sd );
 313 #ifdef HAVE_WINSOCK
 314                 /* Avoid race condition after releasing
 315                  * connections_mutex
 316                  */
 317                 if ( sd != s ) {
 318                         ldap_pvt_thread_mutex_unlock( &c->c_mutex );
 319                         return NULL;
 320                 }
 321 #endif
 322                 if( c->c_struct_state != SLAP_C_USED ) {
 323                         /* connection must have been closed due to resched */
 324
 325                         assert( c->c_conn_state == SLAP_C_INVALID );
 326                         assert( sd == AC_SOCKET_INVALID );
 327
 328                         Debug( LDAP_DEBUG_TRACE,
 329                                 "connection_get(%d): connection not used\n",
 330                                 s, 0, 0 );
 331
 332                         ldap_pvt_thread_mutex_unlock( &c->c_mutex );
 333                         return NULL;
 334                 }
 335
 336                 Debug( LDAP_DEBUG_TRACE,
 337                         "connection_get(%d): got connid=%lu\n",
 338                         s, c->c_connid, 0 );
 339
 340                 c->c_n_get++;
 341
 342                 assert( c->c_struct_state == SLAP_C_USED );
 343                 assert( c->c_conn_state != SLAP_C_INVALID );
 344                 assert( sd != AC_SOCKET_INVALID );
 345
 346 #ifndef SLAPD_MONITOR
 347                 if ( global_idletimeout > 0 )
 348 #endif /* ! SLAPD_MONITOR */
 349                 {
 350                         c->c_activitytime = slap_get_time();
 351                 }
 352         }
 353
 354         return c;
 355 }
 356
 357 static void connection_return( Connection *c )
 358 {
 359         ldap_pvt_thread_mutex_unlock( &c->c_mutex );
 360 }
 361
 362 long connection_init(
 363         ber_socket_t s,
 364         Listener *listener,
 365         const char* dnsname,
 366         const char* peername,
 367         int flags,
 368         slap_ssf_t ssf,
 369         struct berval *authid )
 370 {
 371         unsigned long id;
 372         Connection *c;
 373         int doinit = 0;
 374
 375         assert( connections != NULL );
 376
 377         assert( listener != NULL );
 378         assert( dnsname != NULL );
 379         assert( peername != NULL );
 380
 381 #ifndef HAVE_TLS
 382         assert( flags != CONN_IS_TLS );
 383 #endif
 384
 385         if( s == AC_SOCKET_INVALID ) {
 386                 Debug( LDAP_DEBUG_ANY,
 387                         "connection_init: init of socket %ld invalid.\n", (long)s, 0, 0 );
 388                 return -1;
 389         }
 390
 391         assert( s >= 0 );
 392 #ifndef HAVE_WINSOCK
 393         assert( s < dtblsize );
 394         c = &connections[s];
 395         if( c->c_struct_state == SLAP_C_UNINITIALIZED ) {
 396                 doinit = 1;
 397         } else {
 398                 assert( c->c_struct_state == SLAP_C_UNUSED );
 399         }
 400 #else
 401         {
 402                 ber_socket_t i;
 403                 c = NULL;
 404
 405                 ldap_pvt_thread_mutex_lock( &connections_mutex );
 406                 for( i=0; i < dtblsize; i++) {
 407                         ber_socket_t    sd;
 408
 409                         if ( connections[i].c_struct_state == SLAP_C_PENDING )
 410                                 continue;
 411
 412                         if( connections[i].c_struct_state == SLAP_C_UNINITIALIZED ) {
 413                                 assert( connections[i].c_sb == 0 );
 414                                 c = &connections[i];
 415                                 c->c_struct_state = SLAP_C_PENDING;
 416                                 doinit = 1;
 417                                 break;
 418                         }
 419
 420                         sd = AC_SOCKET_INVALID;
 421                         if (connections[i].c_sb != NULL) {
 422                                 ber_sockbuf_ctrl( connections[i].c_sb,
 423                                         LBER_SB_OPT_GET_FD, &sd );
 424                         }
 425
 426                         if( connections[i].c_struct_state == SLAP_C_UNUSED ) {
 427                                 assert( sd == AC_SOCKET_INVALID );
 428                                 c = &connections[i];
 429                                 c->c_struct_state = SLAP_C_PENDING;
 430                                 break;
 431                         }
 432
 433                         if( connections[i].c_conn_state == SLAP_C_CLIENT ) continue;
 434
 435                         assert( connections[i].c_struct_state == SLAP_C_USED );
 436                         assert( connections[i].c_conn_state != SLAP_C_INVALID );
 437                         assert( sd != AC_SOCKET_INVALID );
 438                 }
 439                 ldap_pvt_thread_mutex_unlock( &connections_mutex );
 440
 441                 if( c == NULL ) {
 442                         Debug( LDAP_DEBUG_ANY,
 443                                 "connection_init(%d): connection table full "
 444                                 "(%d/%d)\n", s, i, dtblsize);
 445                         return -1;
 446                 }
 447         }
 448 #endif
 449
 450         if( doinit ) {
 451                 c->c_send_ldap_result = slap_send_ldap_result;
 452                 c->c_send_search_entry = slap_send_search_entry;
 453                 c->c_send_search_reference = slap_send_search_reference;
 454                 c->c_send_ldap_extended = slap_send_ldap_extended;
 455                 c->c_send_ldap_intermediate = slap_send_ldap_intermediate;
 456
 457                 BER_BVZERO( &c->c_authmech );
 458                 BER_BVZERO( &c->c_dn );
 459                 BER_BVZERO( &c->c_ndn );
 460
 461                 c->c_listener = NULL;
 462                 BER_BVZERO( &c->c_peer_domain );
 463                 BER_BVZERO( &c->c_peer_name );
 464
 465                 LDAP_STAILQ_INIT(&c->c_ops);
 466                 LDAP_STAILQ_INIT(&c->c_pending_ops);
 467
 468 #ifdef LDAP_X_TXN
 469                 c->c_txn = CONN_TXN_INACTIVE;
 470                 c->c_txn_backend = NULL;
 471                 LDAP_STAILQ_INIT(&c->c_txn_ops);
 472 #endif
 473
 474                 BER_BVZERO( &c->c_sasl_bind_mech );
 475                 c->c_sasl_done = 0;
 476                 c->c_sasl_authctx = NULL;
 477                 c->c_sasl_sockctx = NULL;
 478                 c->c_sasl_extra = NULL;
 479                 c->c_sasl_bindop = NULL;
 480
 481                 c->c_sb = ber_sockbuf_alloc( );
 482
 483                 {
 484                         ber_len_t max = sockbuf_max_incoming;
 485                         ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_SET_MAX_INCOMING, &max );
 486                 }
 487
 488                 c->c_currentber = NULL;
 489
 490                 /* should check status of thread calls */
 491                 ldap_pvt_thread_mutex_init( &c->c_mutex );
 492                 ldap_pvt_thread_mutex_init( &c->c_write_mutex );
 493                 ldap_pvt_thread_cond_init( &c->c_write_cv );
 494
 495 #ifdef LDAP_SLAPI
 496                 if ( slapi_plugins_used ) {
 497                         slapi_int_create_object_extensions( SLAPI_X_EXT_CONNECTION, c );
 498                 }
 499 #endif
 500         }
 501
 502         ldap_pvt_thread_mutex_lock( &c->c_mutex );
 503
 504         assert( BER_BVISNULL( &c->c_authmech ) );
 505         assert( BER_BVISNULL( &c->c_dn ) );
 506         assert( BER_BVISNULL( &c->c_ndn ) );
 507         assert( c->c_listener == NULL );
 508         assert( BER_BVISNULL( &c->c_peer_domain ) );
 509         assert( BER_BVISNULL( &c->c_peer_name ) );
 510         assert( LDAP_STAILQ_EMPTY(&c->c_ops) );
 511         assert( LDAP_STAILQ_EMPTY(&c->c_pending_ops) );
 512 #ifdef LDAP_X_TXN
 513         assert( c->c_txn == CONN_TXN_INACTIVE );
 514         assert( c->c_txn_backend == NULL );
 515         assert( LDAP_STAILQ_EMPTY(&c->c_txn_ops) );
 516 #endif
 517         assert( BER_BVISNULL( &c->c_sasl_bind_mech ) );
 518         assert( c->c_sasl_done == 0 );
 519         assert( c->c_sasl_authctx == NULL );
 520         assert( c->c_sasl_sockctx == NULL );
 521         assert( c->c_sasl_extra == NULL );
 522         assert( c->c_sasl_bindop == NULL );
 523         assert( c->c_currentber == NULL );
 524         assert( c->c_writewaiter == 0);
 525
 526         c->c_listener = listener;
 527
 528         if ( flags == CONN_IS_CLIENT ) {
 529                 c->c_conn_state = SLAP_C_CLIENT;
 530                 c->c_struct_state = SLAP_C_USED;
 531                 c->c_close_reason = "?";                        /* should never be needed */
 532                 ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_SET_FD, &s );
 533                 ldap_pvt_thread_mutex_unlock( &c->c_mutex );
 534
 535                 return 0;
 536         }
 537
 538         ber_str2bv( dnsname, 0, 1, &c->c_peer_domain );
 539         ber_str2bv( peername, 0, 1, &c->c_peer_name );
 540
 541         c->c_n_ops_received = 0;
 542         c->c_n_ops_executing = 0;
 543         c->c_n_ops_pending = 0;
 544         c->c_n_ops_completed = 0;
 545
 546         c->c_n_get = 0;
 547         c->c_n_read = 0;
 548         c->c_n_write = 0;
 549
 550         /* set to zero until bind, implies LDAP_VERSION3 */
 551         c->c_protocol = 0;
 552
 553 #ifndef SLAPD_MONITOR
 554         if ( global_idletimeout > 0 )
 555 #endif /* ! SLAPD_MONITOR */
 556         {
 557                 c->c_activitytime = c->c_starttime = slap_get_time();
 558         }
 559
 560 #ifdef LDAP_CONNECTIONLESS
 561         c->c_is_udp = 0;
 562         if( flags == CONN_IS_UDP ) {
 563                 c->c_is_udp = 1;
 564 #ifdef LDAP_DEBUG
 565                 ber_sockbuf_add_io( c->c_sb, &ber_sockbuf_io_debug,
 566                         LBER_SBIOD_LEVEL_PROVIDER, (void*)"udp_" );
 567 #endif
 568                 ber_sockbuf_add_io( c->c_sb, &ber_sockbuf_io_udp,
 569                         LBER_SBIOD_LEVEL_PROVIDER, (void *)&s );
 570                 ber_sockbuf_add_io( c->c_sb, &ber_sockbuf_io_readahead,
 571                         LBER_SBIOD_LEVEL_PROVIDER, NULL );
 572         } else
 573 #endif
 574         {
 575 #ifdef LDAP_DEBUG
 576                 ber_sockbuf_add_io( c->c_sb, &ber_sockbuf_io_debug,
 577                         LBER_SBIOD_LEVEL_PROVIDER, (void*)"tcp_" );
 578 #endif
 579                 ber_sockbuf_add_io( c->c_sb, &ber_sockbuf_io_tcp,
 580                         LBER_SBIOD_LEVEL_PROVIDER, (void *)&s );
 581         }
 582
 583 #ifdef LDAP_DEBUG
 584         ber_sockbuf_add_io( c->c_sb, &ber_sockbuf_io_debug,
 585                 INT_MAX, (void*)"ldap_" );
 586 #endif
 587
 588         if( ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_SET_NONBLOCK,
 589                 c /* non-NULL */ ) < 0 )
 590         {
 591                 Debug( LDAP_DEBUG_ANY,
 592                         "connection_init(%d, %s): set nonblocking failed\n",
 593                         s, c->c_peer_name.bv_val, 0 );
 594         }
 595
 596         ldap_pvt_thread_mutex_lock( &conn_nextid_mutex );
 597         id = c->c_connid = conn_nextid++;
 598         ldap_pvt_thread_mutex_unlock( &conn_nextid_mutex );
 599
 600         c->c_conn_state = SLAP_C_INACTIVE;
 601         c->c_struct_state = SLAP_C_USED;
 602         c->c_close_reason = "?";                        /* should never be needed */
 603
 604         c->c_ssf = c->c_transport_ssf = ssf;
 605         c->c_tls_ssf = 0;
 606
 607 #ifdef HAVE_TLS
 608         if ( flags == CONN_IS_TLS ) {
 609                 c->c_is_tls = 1;
 610                 c->c_needs_tls_accept = 1;
 611         } else {
 612                 c->c_is_tls = 0;
 613                 c->c_needs_tls_accept = 0;
 614         }
 615 #endif
 616
 617         slap_sasl_open( c, 0 );
 618         slap_sasl_external( c, ssf, authid );
 619
 620         slapd_add_internal( s, 1 );
 621         ldap_pvt_thread_mutex_unlock( &c->c_mutex );
 622
 623         backend_connection_init(c);
 624
 625         return id;
 626 }
 627
 628 void connection2anonymous( Connection *c )
 629 {
 630         assert( connections != NULL );
 631         assert( c != NULL );
 632
 633         {
 634                 ber_len_t max = sockbuf_max_incoming;
 635                 ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_SET_MAX_INCOMING, &max );
 636         }
 637
 638         if ( !BER_BVISNULL( &c->c_authmech ) ) {
 639                 ch_free(c->c_authmech.bv_val);
 640         }
 641         BER_BVZERO( &c->c_authmech );
 642
 643         if ( !BER_BVISNULL( &c->c_dn ) ) {
 644                 ch_free(c->c_dn.bv_val);
 645         }
 646         BER_BVZERO( &c->c_dn );
 647
 648         if ( !BER_BVISNULL( &c->c_ndn ) ) {
 649                 ch_free(c->c_ndn.bv_val);
 650         }
 651         BER_BVZERO( &c->c_ndn );
 652
 653         if ( !BER_BVISNULL( &c->c_sasl_authz_dn ) ) {
 654                 ber_memfree_x( c->c_sasl_authz_dn.bv_val, NULL );
 655         }
 656         BER_BVZERO( &c->c_sasl_authz_dn );
 657
 658         c->c_authz_backend = NULL;
 659 }
 660
 661 static void
 662 connection_destroy( Connection *c )
 663 {
 664         ber_socket_t    sd;
 665         unsigned long   connid;
 666         const char              *close_reason;
 667         Sockbuf                 *sb;
 668
 669         assert( connections != NULL );
 670         assert( c != NULL );
 671         assert( c->c_struct_state != SLAP_C_UNUSED );
 672         assert( c->c_conn_state != SLAP_C_INVALID );
 673         assert( LDAP_STAILQ_EMPTY(&c->c_ops) );
 674         assert( LDAP_STAILQ_EMPTY(&c->c_pending_ops) );
 675 #ifdef LDAP_X_TXN
 676         assert( c->c_txn == CONN_TXN_INACTIVE );
 677         assert( c->c_txn_backend == NULL );
 678         assert( LDAP_STAILQ_EMPTY(&c->c_txn_ops) );
 679 #endif
 680         assert( c->c_writewaiter == 0);
 681
 682         /* only for stats (print -1 as "%lu" may give unexpected results ;) */
 683         connid = c->c_connid;
 684         close_reason = c->c_close_reason;
 685
 686         ldap_pvt_thread_mutex_lock( &connections_mutex );
 687         c->c_struct_state = SLAP_C_PENDING;
 688         ldap_pvt_thread_mutex_unlock( &connections_mutex );
 689
 690         backend_connection_destroy(c);
 691
 692         c->c_protocol = 0;
 693         c->c_connid = -1;
 694
 695         c->c_activitytime = c->c_starttime = 0;
 696
 697         connection2anonymous( c );
 698         c->c_listener = NULL;
 699
 700         if(c->c_peer_domain.bv_val != NULL) {
 701                 free(c->c_peer_domain.bv_val);
 702         }
 703         BER_BVZERO( &c->c_peer_domain );
 704         if(c->c_peer_name.bv_val != NULL) {
 705                 free(c->c_peer_name.bv_val);
 706         }
 707         BER_BVZERO( &c->c_peer_name );
 708
 709         c->c_sasl_bind_in_progress = 0;
 710         if(c->c_sasl_bind_mech.bv_val != NULL) {
 711                 free(c->c_sasl_bind_mech.bv_val);
 712         }
 713         BER_BVZERO( &c->c_sasl_bind_mech );
 714
 715         slap_sasl_close( c );
 716
 717         if ( c->c_currentber != NULL ) {
 718                 ber_free( c->c_currentber, 1 );
 719                 c->c_currentber = NULL;
 720         }
 721
 722
 723 #ifdef LDAP_SLAPI
 724         /* call destructors, then constructors; avoids unnecessary allocation */
 725         if ( slapi_plugins_used ) {
 726                 slapi_int_clear_object_extensions( SLAPI_X_EXT_CONNECTION, c );
 727         }
 728 #endif
 729
 730         c->c_conn_state = SLAP_C_INVALID;
 731         c->c_struct_state = SLAP_C_UNUSED;
 732         c->c_close_reason = "?";                        /* should never be needed */
 733
 734         sb = c->c_sb;
 735         c->c_sb = ber_sockbuf_alloc( );
 736         {
 737                 ber_len_t max = sockbuf_max_incoming;
 738                 ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_SET_MAX_INCOMING, &max );
 739         }
 740
 741         ber_sockbuf_ctrl( sb, LBER_SB_OPT_GET_FD, &sd );
 742
 743         /* c must be fully reset by this point; when we call slapd_remove
 744          * it may get immediately reused by a new connection.
 745          */
 746         if ( sd != AC_SOCKET_INVALID ) {
 747                 slapd_remove( sd, sb, 1, 0, 0 );
 748
 749                 if ( close_reason == NULL ) {
 750                         close_reason = "";
 751                 }
 752
 753                 Statslog( LDAP_DEBUG_STATS, "conn=%lu fd=%ld closed (%s)\n",
 754                         connid, (long) sd, close_reason, 0, 0 );
 755         }
 756 }
 757
 758 int connection_state_closing( Connection *c )
 759 {
 760         /* c_mutex must be locked by caller */
 761
 762         int state;
 763         assert( c != NULL );
 764         assert( c->c_struct_state == SLAP_C_USED );
 765
 766         state = c->c_conn_state;
 767
 768         assert( state != SLAP_C_INVALID );
 769
 770         return state == SLAP_C_CLOSING;
 771 }
 772
 773 static void connection_abandon( Connection *c )
 774 {
 775         /* c_mutex must be locked by caller */
 776
 777         Operation *o, *next, op = {0};
 778         Opheader ohdr = {0};
 779         SlapReply rs = {0};
 780
 781         op.o_hdr = &ohdr;
 782         op.o_conn = c;
 783         op.o_connid = c->c_connid;
 784         op.o_tag = LDAP_REQ_ABANDON;
 785
 786         for ( o = LDAP_STAILQ_FIRST( &c->c_ops ); o; o=next ) {
 787                 next = LDAP_STAILQ_NEXT( o, o_next );
 788                 op.orn_msgid = o->o_msgid;
 789                 o->o_abandon = 1;
 790                 op.o_bd = frontendDB;
 791                 frontendDB->be_abandon( &op, &rs );
 792         }
 793
 794 #ifdef LDAP_X_TXN
 795         /* remove operations in pending transaction */
 796         while ( (o = LDAP_STAILQ_FIRST( &c->c_txn_ops )) != NULL) {
 797                 LDAP_STAILQ_REMOVE_HEAD( &c->c_txn_ops, o_next );
 798                 LDAP_STAILQ_NEXT(o, o_next) = NULL;
 799                 slap_op_free( o );
 800         }
 801
 802         /* clear transaction */
 803         c->c_txn_backend = NULL;
 804         c->c_txn = CONN_TXN_INACTIVE;
 805 #endif
 806
 807         /* remove pending operations */
 808         while ( (o = LDAP_STAILQ_FIRST( &c->c_pending_ops )) != NULL) {
 809                 LDAP_STAILQ_REMOVE_HEAD( &c->c_pending_ops, o_next );
 810                 LDAP_STAILQ_NEXT(o, o_next) = NULL;
 811                 slap_op_free( o );
 812         }
 813 }
 814
 815 void connection_closing( Connection *c, const char *why )
 816 {
 817         assert( connections != NULL );
 818         assert( c != NULL );
 819         assert( c->c_struct_state == SLAP_C_USED );
 820         assert( c->c_conn_state != SLAP_C_INVALID );
 821
 822         /* c_mutex must be locked by caller */
 823
 824         if( c->c_conn_state != SLAP_C_CLOSING ) {
 825                 ber_socket_t    sd;
 826
 827                 ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_GET_FD, &sd );
 828                 Debug( LDAP_DEBUG_TRACE,
 829                         "connection_closing: readying conn=%lu sd=%d for close\n",
 830                         c->c_connid, sd, 0 );
 831                 /* update state to closing */
 832                 c->c_conn_state = SLAP_C_CLOSING;
 833                 c->c_close_reason = why;
 834
 835                 /* don't listen on this port anymore */
 836                 slapd_clr_read( sd, 0 );
 837
 838                 /* abandon active operations */
 839                 connection_abandon( c );
 840
 841                 /* wake write blocked operations */
 842                 if ( c->c_writewaiter ) {
 843                         ldap_pvt_thread_cond_signal( &c->c_write_cv );
 844                         /* ITS#4667 this may allow another thread to drop into
 845                          * connection_resched / connection_close before we
 846                          * finish, but that's OK.
 847                          */
 848                         slapd_clr_write( sd, 1 );
 849                         ldap_pvt_thread_mutex_unlock( &c->c_mutex );
 850                         ldap_pvt_thread_mutex_lock( &c->c_write_mutex );
 851                         ldap_pvt_thread_mutex_lock( &c->c_mutex );
 852                         ldap_pvt_thread_mutex_unlock( &c->c_write_mutex );
 853                 } else {
 854                         slapd_clr_write( sd, 1 );
 855                 }
 856
 857         } else if( why == NULL && c->c_close_reason == conn_lost_str ) {
 858                 /* Client closed connection after doing Unbind. */
 859                 c->c_close_reason = NULL;
 860         }
 861 }
 862
 863 static void
 864 connection_close( Connection *c )
 865 {
 866         ber_socket_t    sd = AC_SOCKET_INVALID;
 867
 868         assert( connections != NULL );
 869         assert( c != NULL );
 870
 871         /* ITS#4667 we may have gotten here twice */
 872         if ( c->c_conn_state == SLAP_C_INVALID )
 873                 return;
 874
 875         assert( c->c_struct_state == SLAP_C_USED );
 876         assert( c->c_conn_state == SLAP_C_CLOSING );
 877
 878         /* NOTE: c_mutex should be locked by caller */
 879
 880         /* NOTE: don't get the file descriptor if not needed */
 881         if ( LogTest( LDAP_DEBUG_TRACE ) ) {
 882                 ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_GET_FD, &sd );
 883         }
 884
 885         if ( !LDAP_STAILQ_EMPTY(&c->c_ops) ||
 886                 !LDAP_STAILQ_EMPTY(&c->c_pending_ops) )
 887         {
 888                 Debug( LDAP_DEBUG_TRACE,
 889                         "connection_close: deferring conn=%lu sd=%d\n",
 890                         c->c_connid, sd, 0 );
 891                 return;
 892         }
 893
 894         Debug( LDAP_DEBUG_TRACE, "connection_close: conn=%lu sd=%d\n",
 895                 c->c_connid, sd, 0 );
 896
 897         connection_destroy( c );
 898 }
 899
 900 unsigned long connections_nextid(void)
 901 {
 902         unsigned long id;
 903         assert( connections != NULL );
 904
 905         ldap_pvt_thread_mutex_lock( &conn_nextid_mutex );
 906
 907         id = conn_nextid;
 908
 909         ldap_pvt_thread_mutex_unlock( &conn_nextid_mutex );
 910
 911         return id;
 912 }
 913
 914 Connection* connection_first( ber_socket_t *index )
 915 {
 916         assert( connections != NULL );
 917         assert( index != NULL );
 918
 919         ldap_pvt_thread_mutex_lock( &connections_mutex );
 920         for( *index = 0; *index < dtblsize; (*index)++) {
 921                 if( connections[*index].c_struct_state != SLAP_C_UNINITIALIZED ) {
 922                         break;
 923                 }
 924         }
 925         ldap_pvt_thread_mutex_unlock( &connections_mutex );
 926
 927         return connection_next(NULL, index);
 928 }
 929
 930 Connection* connection_next( Connection *c, ber_socket_t *index )
 931 {
 932         assert( connections != NULL );
 933         assert( index != NULL );
 934         assert( *index <= dtblsize );
 935
 936         if( c != NULL ) ldap_pvt_thread_mutex_unlock( &c->c_mutex );
 937
 938         c = NULL;
 939
 940         ldap_pvt_thread_mutex_lock( &connections_mutex );
 941         for(; *index < dtblsize; (*index)++) {
 942                 int c_struct;
 943                 if( connections[*index].c_struct_state == SLAP_C_UNINITIALIZED ) {
 944                         assert( connections[*index].c_conn_state == SLAP_C_INVALID );
 945 #ifdef HAVE_WINSOCK
 946                         break;
 947 #else
 948                         continue;
 949 #endif
 950                 }
 951
 952                 if( connections[*index].c_struct_state == SLAP_C_USED ) {
 953                         assert( connections[*index].c_conn_state != SLAP_C_INVALID );
 954                         c = &connections[(*index)++];
 955                         if ( ldap_pvt_thread_mutex_trylock( &c->c_mutex )) {
 956                                 /* avoid deadlock */
 957                                 ldap_pvt_thread_mutex_unlock( &connections_mutex );
 958                                 ldap_pvt_thread_mutex_lock( &c->c_mutex );
 959                                 ldap_pvt_thread_mutex_lock( &connections_mutex );
 960                                 if ( c->c_struct_state != SLAP_C_USED ) {
 961                                         ldap_pvt_thread_mutex_unlock( &c->c_mutex );
 962                                         c = NULL;
 963                                         continue;
 964                                 }
 965                         }
 966                         break;
 967                 }
 968
 969                 c_struct = connections[*index].c_struct_state;
 970                 if ( c_struct == SLAP_C_PENDING )
 971                         continue;
 972                 assert( c_struct == SLAP_C_UNUSED );
 973                 assert( connections[*index].c_conn_state == SLAP_C_INVALID );
 974         }
 975
 976         ldap_pvt_thread_mutex_unlock( &connections_mutex );
 977         return c;
 978 }
 979
 980 void connection_done( Connection *c )
 981 {
 982         assert( connections != NULL );
 983
 984         if( c != NULL ) ldap_pvt_thread_mutex_unlock( &c->c_mutex );
 985 }
 986
 987 /*
 988  * connection_activity - handle the request operation op on connection
 989  * conn.  This routine figures out what kind of operation it is and
 990  * calls the appropriate stub to handle it.
 991  */
 992
 993 #ifdef SLAPD_MONITOR
 994 /* FIXME: returns 0 in case of failure */
 995 #define INCR_OP_INITIATED(index) \
 996         do { \
 997                 ldap_pvt_thread_mutex_lock( &slap_counters.sc_ops_mutex ); \
 998                 ldap_pvt_mp_add_ulong(slap_counters.sc_ops_initiated_[(index)], 1); \
 999                 ldap_pvt_thread_mutex_unlock( &slap_counters.sc_ops_mutex ); \
1000         } while (0)
1001 #define INCR_OP_COMPLETED(index) \
1002         do { \
1003                 ldap_pvt_thread_mutex_lock( &slap_counters.sc_ops_mutex ); \
1004                 ldap_pvt_mp_add_ulong(slap_counters.sc_ops_completed, 1); \
1005                 ldap_pvt_mp_add_ulong(slap_counters.sc_ops_completed_[(index)], 1); \
1006                 ldap_pvt_thread_mutex_unlock( &slap_counters.sc_ops_mutex ); \
1007         } while (0)
1008 #else /* !SLAPD_MONITOR */
1009 #define INCR_OP_INITIATED(index) do { } while (0)
1010 #define INCR_OP_COMPLETED(index) \
1011         do { \
1012                 ldap_pvt_thread_mutex_lock( &slap_counters.sc_ops_mutex ); \
1013                 ldap_pvt_mp_add_ulong(slap_counters.sc_ops_completed, 1); \
1014                 ldap_pvt_thread_mutex_unlock( &slap_counters.sc_ops_mutex ); \
1015         } while (0)
1016 #endif /* !SLAPD_MONITOR */
1017
1018 /*
1019  * NOTE: keep in sync with enum in slapd.h
1020  */
1021 static BI_op_func *opfun[] = {
1022         do_bind,
1023         do_unbind,
1024         do_add,
1025         do_delete,
1026         do_modrdn,
1027         do_modify,
1028         do_compare,
1029         do_search,
1030         do_abandon,
1031         do_extended,
1032         NULL
1033 };
1034
1035 static void *
1036 connection_operation( void *ctx, void *arg_v )
1037 {
1038         int rc = LDAP_OTHER;
1039         Operation *op = arg_v;
1040         SlapReply rs = {REP_RESULT};
1041         ber_tag_t tag = op->o_tag;
1042         slap_op_t opidx = SLAP_OP_LAST;
1043         Connection *conn = op->o_conn;
1044         void *memctx = NULL;
1045         void *memctx_null = NULL;
1046         ber_len_t memsiz;
1047
1048         ldap_pvt_thread_mutex_lock( &slap_counters.sc_ops_mutex );
1049         /* FIXME: returns 0 in case of failure */
1050         ldap_pvt_mp_add_ulong(slap_counters.sc_ops_initiated, 1);
1051         ldap_pvt_thread_mutex_unlock( &slap_counters.sc_ops_mutex );
1052
1053         op->o_threadctx = ctx;
1054         op->o_tid = ldap_pvt_thread_pool_tid( ctx );
1055
1056         switch ( tag ) {
1057         case LDAP_REQ_BIND:
1058         case LDAP_REQ_UNBIND:
1059         case LDAP_REQ_ADD:
1060         case LDAP_REQ_DELETE:
1061         case LDAP_REQ_MODDN:
1062         case LDAP_REQ_MODIFY:
1063         case LDAP_REQ_COMPARE:
1064         case LDAP_REQ_SEARCH:
1065         case LDAP_REQ_ABANDON:
1066         case LDAP_REQ_EXTENDED:
1067                 break;
1068         default:
1069                 Debug( LDAP_DEBUG_ANY, "connection_operation: "
1070                         "conn %lu unknown LDAP request 0x%lx\n",
1071                         conn->c_connid, tag, 0 );
1072                 op->o_tag = LBER_ERROR;
1073                 rs.sr_err = LDAP_PROTOCOL_ERROR;
1074                 rs.sr_text = "unknown LDAP request";
1075                 send_ldap_disconnect( op, &rs );
1076                 rc = SLAPD_DISCONNECT;
1077                 goto operations_error;
1078         }
1079
1080         if( conn->c_sasl_bind_in_progress && tag != LDAP_REQ_BIND ) {
1081                 Debug( LDAP_DEBUG_ANY, "connection_operation: "
1082                         "error: SASL bind in progress (tag=%ld).\n",
1083                         (long) tag, 0, 0 );
1084                 send_ldap_error( op, &rs, LDAP_OPERATIONS_ERROR,
1085                         "SASL bind in progress" );
1086                 rc = LDAP_OPERATIONS_ERROR;
1087                 goto operations_error;
1088         }
1089
1090 #ifdef LDAP_X_TXN
1091         if (( conn->c_txn == CONN_TXN_SPECIFY ) && (
1092                 ( tag == LDAP_REQ_ADD ) ||
1093                 ( tag == LDAP_REQ_DELETE ) ||
1094                 ( tag == LDAP_REQ_MODIFY ) ||
1095                 ( tag == LDAP_REQ_MODRDN )))
1096         {
1097                 /* Disable SLAB allocator for all update operations
1098                         issued inside of a transaction */
1099                 op->o_tmpmemctx = NULL;
1100                 op->o_tmpmfuncs = &ch_mfuncs;
1101         } else
1102 #endif
1103         {
1104         /* We can use Thread-Local storage for most mallocs. We can
1105          * also use TL for ber parsing, but not on Add or Modify.
1106          */
1107 #if 0
1108         memsiz = ber_len( op->o_ber ) * 64;
1109         if ( SLAP_SLAB_SIZE > memsiz ) memsiz = SLAP_SLAB_SIZE;
1110 #endif
1111         memsiz = SLAP_SLAB_SIZE;
1112
1113         memctx = slap_sl_mem_create( memsiz, SLAP_SLAB_STACK, ctx );
1114         op->o_tmpmemctx = memctx;
1115         op->o_tmpmfuncs = &slap_sl_mfuncs;
1116         if ( tag != LDAP_REQ_ADD && tag != LDAP_REQ_MODIFY ) {
1117                 /* Note - the ber and its buffer are already allocated from
1118                  * regular memory; this only affects subsequent mallocs that
1119                  * ber_scanf may invoke.
1120                  */
1121                 ber_set_option( op->o_ber, LBER_OPT_BER_MEMCTX, &memctx );
1122         }
1123         }
1124
1125         opidx = slap_req2op( tag );
1126         assert( opidx != SLAP_OP_LAST );
1127         INCR_OP_INITIATED( opidx );
1128         rc = (*(opfun[opidx]))( op, &rs );
1129
1130 operations_error:
1131         if ( rc == SLAPD_DISCONNECT ) {
1132                 tag = LBER_ERROR;
1133
1134         } else if ( opidx != SLAP_OP_LAST ) {
1135                 /* increment completed operations count
1136                  * only if operation was initiated
1137                  * and rc != SLAPD_DISCONNECT */
1138                 INCR_OP_COMPLETED( opidx );
1139         }
1140
1141         if ( op->o_cancel == SLAP_CANCEL_REQ ) {
1142                 if ( rc == SLAPD_ABANDON ) {
1143                         op->o_cancel = SLAP_CANCEL_ACK;
1144                 } else {
1145                         op->o_cancel = LDAP_TOO_LATE;
1146                 }
1147         }
1148
1149         while ( op->o_cancel != SLAP_CANCEL_NONE &&
1150                 op->o_cancel != SLAP_CANCEL_DONE )
1151         {
1152                 ldap_pvt_thread_yield();
1153         }
1154
1155         ldap_pvt_thread_mutex_lock( &conn->c_mutex );
1156
1157         ber_set_option( op->o_ber, LBER_OPT_BER_MEMCTX, &memctx_null );
1158
1159         LDAP_STAILQ_REMOVE( &conn->c_ops, op, slap_op, o_next);
1160         LDAP_STAILQ_NEXT(op, o_next) = NULL;
1161         slap_op_free( op );
1162         conn->c_n_ops_executing--;
1163         conn->c_n_ops_completed++;
1164
1165         switch( tag ) {
1166         case LBER_ERROR:
1167         case LDAP_REQ_UNBIND:
1168                 /* c_mutex is locked */
1169                 connection_closing( conn,
1170                         tag == LDAP_REQ_UNBIND ? NULL : "operations error" );
1171                 break;
1172         }
1173
1174         connection_resched( conn );
1175         ldap_pvt_thread_mutex_unlock( &conn->c_mutex );
1176         return NULL;
1177 }
1178
1179 static const Listener dummy_list = { BER_BVC(""), BER_BVC("") };
1180
1181 int connection_client_setup(
1182         ber_socket_t s,
1183         ldap_pvt_thread_start_t *func,
1184         void *arg )
1185 {
1186         int rc;
1187         Connection *c;
1188
1189         rc = connection_init( s, (Listener *)&dummy_list, "", "",
1190                 CONN_IS_CLIENT, 0, NULL );
1191         if ( rc < 0 ) return -1;
1192
1193         c = connection_get( s );
1194         c->c_clientfunc = func;
1195         c->c_clientarg = arg;
1196
1197         slapd_add_internal( s, 0 );
1198         slapd_set_read( s, 1 );
1199         connection_return( c );
1200         return 0;
1201 }
1202
1203 void connection_client_enable(
1204         ber_socket_t s )
1205 {
1206         slapd_set_read( s, 1 );
1207 }
1208
1209 void connection_client_stop(
1210         ber_socket_t s )
1211 {
1212         Connection *c;
1213         Sockbuf *sb;
1214
1215         /* get (locked) connection */
1216         c = connection_get( s );
1217
1218         assert( c->c_conn_state == SLAP_C_CLIENT );
1219
1220         c->c_listener = NULL;
1221         c->c_conn_state = SLAP_C_INVALID;
1222         c->c_struct_state = SLAP_C_UNUSED;
1223         c->c_close_reason = "?";                        /* should never be needed */
1224         sb = c->c_sb;
1225         c->c_sb = ber_sockbuf_alloc( );
1226         {
1227                 ber_len_t max = sockbuf_max_incoming;
1228                 ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_SET_MAX_INCOMING, &max );
1229         }
1230         slapd_remove( s, sb, 0, 1, 0 );
1231
1232         connection_return( c );
1233 }
1234
1235 #ifdef SLAP_LIGHTWEIGHT_DISPATCHER
1236
1237 static int connection_read( ber_socket_t s, conn_readinfo *cri );
1238
1239 static void* connection_read_thread( void* ctx, void* argv )
1240 {
1241         int rc ;
1242         conn_readinfo cri = { NULL, NULL, NULL, 0 };
1243         ber_socket_t s = (long)argv;
1244
1245         /*
1246          * read incoming LDAP requests. If there is more than one,
1247          * the first one is returned with new_op
1248          */
1249         if( ( rc = connection_read( s, &cri ) ) < 0 ) {
1250                 Debug( LDAP_DEBUG_CONNS, "connection_read(%d) error\n", s, 0, 0 );
1251                 return (void*)(long)rc;
1252         }
1253
1254         /* execute a single queued request in the same thread */
1255         if( cri.op && !cri.nullop ) {
1256                 rc = (long)connection_operation( ctx, cri.op );
1257         } else if ( cri.func ) {
1258                 rc = (long)cri.func( ctx, cri.arg );
1259         }
1260
1261         return (void*)(long)rc;
1262 }
1263
1264 int connection_read_activate( ber_socket_t s )
1265 {
1266         int rc;
1267
1268         /*
1269          * suspend reading on this file descriptor until a connection processing
1270          * thread reads data on it. Otherwise the listener thread will repeatedly
1271          * submit the same event on it to the pool.
1272          */
1273         rc = slapd_clr_read( s, 0 );
1274         if ( rc )
1275                 return rc;
1276
1277         rc = ldap_pvt_thread_pool_submit( &connection_pool,
1278                 connection_read_thread, (void *)(long)s );
1279
1280         if( rc != 0 ) {
1281                 Debug( LDAP_DEBUG_ANY,
1282                         "connection_read_activate(%d): submit failed (%d)\n",
1283                         s, rc, 0 );
1284         }
1285
1286         return rc;
1287 }
1288 #endif
1289
1290 #ifdef SLAP_LIGHTWEIGHT_DISPATCHER
1291 static int
1292 connection_read( ber_socket_t s, conn_readinfo *cri )
1293 #else
1294 int connection_read(ber_socket_t s)
1295 #endif
1296 {
1297         int rc = 0;
1298         Connection *c;
1299
1300         assert( connections != NULL );
1301
1302         /* get (locked) connection */
1303         c = connection_get( s );
1304
1305         if( c == NULL ) {
1306                 Debug( LDAP_DEBUG_ANY,
1307                         "connection_read(%ld): no connection!\n",
1308                         (long) s, 0, 0 );
1309
1310                 return -1;
1311         }
1312
1313         c->c_n_read++;
1314
1315         if( c->c_conn_state == SLAP_C_CLOSING ) {
1316                 Debug( LDAP_DEBUG_TRACE,
1317                         "connection_read(%d): closing, ignoring input for id=%lu\n",
1318                         s, c->c_connid, 0 );
1319                 connection_return( c );
1320                 return 0;
1321         }
1322
1323         if ( c->c_conn_state == SLAP_C_CLIENT ) {
1324 #ifdef SLAP_LIGHTWEIGHT_DISPATCHER
1325                 cri->func = c->c_clientfunc;
1326                 cri->arg = c->c_clientarg;
1327                 /* read should already be cleared */
1328 #else
1329                 slapd_clr_read( s, 0 );
1330                 ldap_pvt_thread_pool_submit( &connection_pool,
1331                         c->c_clientfunc, c->c_clientarg );
1332 #endif
1333                 connection_return( c );
1334                 return 0;
1335         }
1336
1337         Debug( LDAP_DEBUG_TRACE,
1338                 "connection_read(%d): checking for input on id=%lu\n",
1339                 s, c->c_connid, 0 );
1340
1341 #ifdef HAVE_TLS
1342         if ( c->c_is_tls && c->c_needs_tls_accept ) {
1343                 rc = ldap_pvt_tls_accept( c->c_sb, slap_tls_ctx );
1344                 if ( rc < 0 ) {
1345                         Debug( LDAP_DEBUG_TRACE,
1346                                 "connection_read(%d): TLS accept failure "
1347                                 "error=%d id=%lu, closing\n",
1348                                 s, rc, c->c_connid );
1349
1350                         c->c_needs_tls_accept = 0;
1351                         /* c_mutex is locked */
1352                         connection_closing( c, "TLS negotiation failure" );
1353                         connection_close( c );
1354                         connection_return( c );
1355                         return 0;
1356
1357                 } else if ( rc == 0 ) {
1358                         void *ssl;
1359                         struct berval authid = BER_BVNULL;
1360
1361                         c->c_needs_tls_accept = 0;
1362
1363                         /* we need to let SASL know */
1364                         ssl = ldap_pvt_tls_sb_ctx( c->c_sb );
1365
1366                         c->c_tls_ssf = (slap_ssf_t) ldap_pvt_tls_get_strength( ssl );
1367                         if( c->c_tls_ssf > c->c_ssf ) {
1368                                 c->c_ssf = c->c_tls_ssf;
1369                         }
1370
1371                         rc = dnX509peerNormalize( ssl, &authid );
1372                         if ( rc != LDAP_SUCCESS ) {
1373                                 Debug( LDAP_DEBUG_TRACE, "connection_read(%d): "
1374                                         "unable to get TLS client DN, error=%d id=%lu\n",
1375                                         s, rc, c->c_connid );
1376                         }
1377                         Statslog( LDAP_DEBUG_STATS,
1378                                 "conn=%lu fd=%d TLS established tls_ssf=%u ssf=%u\n",
1379                             c->c_connid, (int) s, c->c_tls_ssf, c->c_ssf, 0 );
1380                         slap_sasl_external( c, c->c_tls_ssf, &authid );
1381                         if ( authid.bv_val ) free( authid.bv_val );
1382                 }
1383
1384                 /* if success and data is ready, fall thru to data input loop */
1385                 if( !ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_DATA_READY, NULL ) )
1386                 {
1387 #ifdef SLAP_LIGHTWEIGHT_DISPATCHER
1388                         slapd_set_read( s, 1 );
1389 #endif
1390
1391                         connection_return( c );
1392                         return 0;
1393                 }
1394         }
1395 #endif
1396
1397 #ifdef HAVE_CYRUS_SASL
1398         if ( c->c_sasl_layers ) {
1399                 /* If previous layer is not removed yet, give up for now */
1400                 if ( !c->c_sasl_sockctx ) {
1401 #ifdef SLAP_LIGHTWEIGHT_DISPATCHER
1402                         slapd_set_read( s, 1 );
1403 #endif
1404
1405                         connection_return( c );
1406                         return 0;
1407                 }
1408
1409                 c->c_sasl_layers = 0;
1410
1411                 rc = ldap_pvt_sasl_install( c->c_sb, c->c_sasl_sockctx );
1412                 if( rc != LDAP_SUCCESS ) {
1413                         Debug( LDAP_DEBUG_TRACE,
1414                                 "connection_read(%d): SASL install error "
1415                                 "error=%d id=%lu, closing\n",
1416                                 s, rc, c->c_connid );
1417
1418                         /* c_mutex is locked */
1419                         connection_closing( c, "SASL layer install failure" );
1420                         connection_close( c );
1421                         connection_return( c );
1422                         return 0;
1423                 }
1424         }
1425 #endif
1426
1427 #define CONNECTION_INPUT_LOOP 1
1428 /* #define      DATA_READY_LOOP 1 */
1429
1430         do {
1431                 /* How do we do this without getting into a busy loop ? */
1432 #ifdef SLAP_LIGHTWEIGHT_DISPATCHER
1433                 rc = connection_input( c, cri );
1434 #else
1435                 rc = connection_input( c );
1436 #endif
1437         }
1438 #ifdef DATA_READY_LOOP
1439         while( !rc && ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_DATA_READY, NULL ));
1440 #elif CONNECTION_INPUT_LOOP
1441         while(!rc);
1442 #else
1443         while(0);
1444 #endif
1445
1446         if( rc < 0 ) {
1447                 Debug( LDAP_DEBUG_CONNS,
1448                         "connection_read(%d): input error=%d id=%lu, closing.\n",
1449                         s, rc, c->c_connid );
1450
1451                 /* c_mutex is locked */
1452                 connection_closing( c, conn_lost_str );
1453                 connection_close( c );
1454                 connection_return( c );
1455                 return 0;
1456         }
1457
1458 #ifdef SLAP_LIGHTWEIGHT_DISPATCHER
1459         if ( ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_NEEDS_WRITE, NULL ) ) {
1460                 slapd_set_write( s, 0 );
1461         }
1462
1463         slapd_set_read( s, 1 );
1464 #else
1465         if ( ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_NEEDS_READ, NULL ) ) {
1466                 slapd_set_read( s, 1 );
1467         }
1468
1469         if ( ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_NEEDS_WRITE, NULL ) ) {
1470                 slapd_set_write( s, 1 );
1471         }
1472 #endif
1473
1474         connection_return( c );
1475
1476         return 0;
1477 }
1478
1479 static int
1480 #ifdef SLAP_LIGHTWEIGHT_DISPATCHER
1481 connection_input( Connection *conn , conn_readinfo *cri )
1482 #else
1483 connection_input( Connection *conn )
1484 #endif
1485 {
1486         Operation *op;
1487         ber_tag_t       tag;
1488         ber_len_t       len;
1489         ber_int_t       msgid;
1490         BerElement      *ber;
1491         int             rc;
1492 #ifdef LDAP_CONNECTIONLESS
1493         Sockaddr        peeraddr;
1494         char            *cdn = NULL;
1495 #endif
1496         char *defer = NULL;
1497
1498         if ( conn->c_currentber == NULL &&
1499                 ( conn->c_currentber = ber_alloc()) == NULL )
1500         {
1501                 Debug( LDAP_DEBUG_ANY, "ber_alloc failed\n", 0, 0, 0 );
1502                 return -1;
1503         }
1504
1505         sock_errset(0);
1506
1507 #ifdef LDAP_CONNECTIONLESS
1508         if ( conn->c_is_udp ) {
1509                 char peername[sizeof("IP=255.255.255.255:65336")];
1510
1511                 len = ber_int_sb_read(conn->c_sb, &peeraddr, sizeof(struct sockaddr));
1512                 if (len != sizeof(struct sockaddr)) return 1;
1513
1514                 sprintf( peername, "IP=%s:%d",
1515                         inet_ntoa( peeraddr.sa_in_addr.sin_addr ),
1516                         (unsigned) ntohs( peeraddr.sa_in_addr.sin_port ) );
1517                 Statslog( LDAP_DEBUG_STATS,
1518                         "conn=%lu UDP request from %s (%s) accepted.\n",
1519                         conn->c_connid, peername, conn->c_sock_name.bv_val, 0, 0 );
1520         }
1521 #endif
1522
1523         tag = ber_get_next( conn->c_sb, &len, conn->c_currentber );
1524         if ( tag != LDAP_TAG_MESSAGE ) {
1525                 int err = sock_errno();
1526                 ber_socket_t    sd;
1527
1528                 ber_sockbuf_ctrl( conn->c_sb, LBER_SB_OPT_GET_FD, &sd );
1529
1530                 if ( err != EWOULDBLOCK && err != EAGAIN ) {
1531                         /* log, close and send error */
1532                         Debug( LDAP_DEBUG_TRACE,
1533                                 "ber_get_next on fd %d failed errno=%d (%s)\n",
1534                         sd, err, sock_errstr(err) );
1535                         ber_free( conn->c_currentber, 1 );
1536                         conn->c_currentber = NULL;
1537
1538                         return -2;
1539                 }
1540                 return 1;
1541         }
1542
1543         ber = conn->c_currentber;
1544         conn->c_currentber = NULL;
1545
1546         if ( (tag = ber_get_int( ber, &msgid )) != LDAP_TAG_MSGID ) {
1547                 /* log, close and send error */
1548                 Debug( LDAP_DEBUG_ANY, "ber_get_int returns 0x%lx\n", tag, 0, 0 );
1549                 ber_free( ber, 1 );
1550                 return -1;
1551         }
1552
1553         if ( (tag = ber_peek_tag( ber, &len )) == LBER_ERROR ) {
1554                 /* log, close and send error */
1555                 Debug( LDAP_DEBUG_ANY, "ber_peek_tag returns 0x%lx\n", tag, 0, 0 );
1556                 ber_free( ber, 1 );
1557
1558                 return -1;
1559         }
1560
1561 #ifdef LDAP_CONNECTIONLESS
1562         if( conn->c_is_udp ) {
1563                 if( tag == LBER_OCTETSTRING ) {
1564                         ber_get_stringa( ber, &cdn );
1565                         tag = ber_peek_tag(ber, &len);
1566                 }
1567                 if( tag != LDAP_REQ_ABANDON && tag != LDAP_REQ_SEARCH ) {
1568                         Debug( LDAP_DEBUG_ANY, "invalid req for UDP 0x%lx\n", tag, 0, 0 );
1569                         ber_free( ber, 1 );
1570                         return 0;
1571                 }
1572         }
1573 #endif
1574
1575         if(tag == LDAP_REQ_BIND) {
1576                 /* immediately abandon all existing operations upon BIND */
1577                 connection_abandon( conn );
1578         }
1579
1580         op = slap_op_alloc( ber, msgid, tag, conn->c_n_ops_received++ );
1581
1582         op->o_conn = conn;
1583         /* clear state if the connection is being reused from inactive */
1584         if ( conn->c_conn_state == SLAP_C_INACTIVE ) {
1585                 memset( &conn->c_pagedresults_state, 0,
1586                         sizeof( conn->c_pagedresults_state ) );
1587         }
1588
1589         op->o_res_ber = NULL;
1590
1591 #ifdef LDAP_CONNECTIONLESS
1592         if (conn->c_is_udp) {
1593                 if ( cdn ) {
1594                         ber_str2bv( cdn, 0, 1, &op->o_dn );
1595                         op->o_protocol = LDAP_VERSION2;
1596                 }
1597                 op->o_res_ber = ber_alloc_t( LBER_USE_DER );
1598                 if (op->o_res_ber == NULL) return 1;
1599
1600                 rc = ber_write( op->o_res_ber, (char *)&peeraddr,
1601                         sizeof(struct sockaddr), 0 );
1602
1603                 if (rc != sizeof(struct sockaddr)) {
1604                         Debug( LDAP_DEBUG_ANY, "ber_write failed\n", 0, 0, 0 );
1605                         return 1;
1606                 }
1607
1608                 if (op->o_protocol == LDAP_VERSION2) {
1609                         rc = ber_printf(op->o_res_ber, "{is{" /*}}*/, op->o_msgid, "");
1610                         if (rc == -1) {
1611                                 Debug( LDAP_DEBUG_ANY, "ber_write failed\n", 0, 0, 0 );
1612                                 return rc;
1613                         }
1614                 }
1615         }
1616 #endif /* LDAP_CONNECTIONLESS */
1617
1618         rc = 0;
1619
1620         /* Don't process requests when the conn is in the middle of a
1621          * Bind, or if it's closing. Also, don't let any single conn
1622          * use up all the available threads, and don't execute if we're
1623          * currently blocked on output. And don't execute if there are
1624          * already pending ops, let them go first.  Abandon operations
1625          * get exceptions to some, but not all, cases.
1626          */
1627         switch( tag ){
1628         default:
1629                 /* Abandon and Unbind are exempt from these checks */
1630                 if (conn->c_conn_state == SLAP_C_CLOSING) {
1631                         defer = "closing";
1632                         break;
1633                 } else if (conn->c_writewaiter) {
1634                         defer = "awaiting write";
1635                         break;
1636                 } else if (conn->c_n_ops_pending) {
1637                         defer = "pending operations";
1638                         break;
1639                 }
1640                 /* FALLTHRU */
1641         case LDAP_REQ_ABANDON:
1642                 /* Unbind is exempt from these checks */
1643                 if (conn->c_n_ops_executing >= connection_pool_max/2) {
1644                         defer = "too many executing";
1645                         break;
1646                 } else if (conn->c_conn_state == SLAP_C_BINDING) {
1647                         defer = "binding";
1648                         break;
1649                 }
1650                 /* FALLTHRU */
1651         case LDAP_REQ_UNBIND:
1652                 break;
1653         }
1654
1655         if( defer ) {
1656                 int max = conn->c_dn.bv_len
1657                         ? slap_conn_max_pending_auth
1658                         : slap_conn_max_pending;
1659
1660                 Debug( LDAP_DEBUG_ANY,
1661                         "connection_input: conn=%lu deferring operation: %s\n",
1662                         conn->c_connid, defer, 0 );
1663                 conn->c_n_ops_pending++;
1664                 LDAP_STAILQ_INSERT_TAIL( &conn->c_pending_ops, op, o_next );
1665                 rc = ( conn->c_n_ops_pending > max ) ? -1 : 0;
1666
1667         } else {
1668                 conn->c_n_ops_executing++;
1669
1670 #ifdef SLAP_LIGHTWEIGHT_DISPATCHER
1671                 /*
1672                  * The first op will be processed in the same thread context,
1673                  * as long as there is only one op total.
1674                  * Subsequent ops will be submitted to the pool by
1675                  * calling connection_op_activate()
1676                  */
1677                 if ( cri->op == NULL ) {
1678                         /* the first incoming request */
1679                         connection_op_queue( op );
1680                         cri->op = op;
1681                 } else {
1682                         if ( !cri->nullop ) {
1683                                 cri->nullop = 1;
1684                                 rc = ldap_pvt_thread_pool_submit( &connection_pool,
1685                                         connection_operation, (void *) cri->op );
1686                         }
1687                         connection_op_activate( op );
1688                 }
1689 #else
1690                 connection_op_activate( op );
1691 #endif
1692         }
1693
1694 #ifdef NO_THREADS
1695         if ( conn->c_struct_state != SLAP_C_USED ) {
1696                 /* connection must have got closed underneath us */
1697                 return 1;
1698         }
1699 #endif
1700
1701         assert( conn->c_struct_state == SLAP_C_USED );
1702         return rc;
1703 }
1704
1705 static int
1706 connection_resched( Connection *conn )
1707 {
1708         Operation *op;
1709
1710         if( conn->c_conn_state == SLAP_C_CLOSING ) {
1711                 ber_socket_t    sd;
1712                 ber_sockbuf_ctrl( conn->c_sb, LBER_SB_OPT_GET_FD, &sd );
1713
1714                 Debug( LDAP_DEBUG_TRACE, "connection_resched: "
1715                         "attempting closing conn=%lu sd=%d\n",
1716                         conn->c_connid, sd, 0 );
1717                 connection_close( conn );
1718                 return 0;
1719         }
1720
1721         if( conn->c_conn_state != SLAP_C_ACTIVE || conn->c_writewaiter ) {
1722                 /* other states need different handling */
1723                 return 0;
1724         }
1725
1726         while ((op = LDAP_STAILQ_FIRST( &conn->c_pending_ops )) != NULL) {
1727                 if ( conn->c_n_ops_executing > connection_pool_max/2 ) break;
1728
1729                 LDAP_STAILQ_REMOVE_HEAD( &conn->c_pending_ops, o_next );
1730                 LDAP_STAILQ_NEXT(op, o_next) = NULL;
1731
1732                 /* pending operations should not be marked for abandonment */
1733                 assert(!op->o_abandon);
1734
1735                 conn->c_n_ops_pending--;
1736                 conn->c_n_ops_executing++;
1737
1738                 connection_op_activate( op );
1739
1740                 if ( conn->c_conn_state == SLAP_C_BINDING ) break;
1741         }
1742         return 0;
1743 }
1744
1745 static void
1746 connection_init_log_prefix( Operation *op )
1747 {
1748         if ( op->o_connid == (unsigned long)(-1) ) {
1749                 snprintf( op->o_log_prefix, sizeof( op->o_log_prefix ),
1750                         "conn=-1 op=%lu", op->o_opid );
1751
1752         } else {
1753                 snprintf( op->o_log_prefix, sizeof( op->o_log_prefix ),
1754                         "conn=%lu op=%lu", op->o_connid, op->o_opid );
1755         }
1756 }
1757
1758 static int connection_bind_cleanup_cb( Operation *op, SlapReply *rs )
1759 {
1760         op->o_conn->c_sasl_bindop = NULL;
1761
1762         ch_free( op->o_callback );
1763         op->o_callback = NULL;
1764
1765         return SLAP_CB_CONTINUE;
1766 }
1767
1768 static int connection_bind_cb( Operation *op, SlapReply *rs )
1769 {
1770         ldap_pvt_thread_mutex_lock( &op->o_conn->c_mutex );
1771         if ( op->o_conn->c_conn_state == SLAP_C_BINDING )
1772                 op->o_conn->c_conn_state = SLAP_C_ACTIVE;
1773         op->o_conn->c_sasl_bind_in_progress =
1774                 ( rs->sr_err == LDAP_SASL_BIND_IN_PROGRESS );
1775
1776         /* Moved here from bind.c due to ITS#4158 */
1777         op->o_conn->c_sasl_bindop = NULL;
1778         if ( op->orb_method == LDAP_AUTH_SASL ) {
1779                 if( rs->sr_err == LDAP_SUCCESS ) {
1780                         ber_dupbv(&op->o_conn->c_dn, &op->orb_edn);
1781                         if( !BER_BVISEMPTY( &op->orb_edn ) ) {
1782                                 /* edn is always normalized already */
1783                                 ber_dupbv( &op->o_conn->c_ndn, &op->o_conn->c_dn );
1784                         }
1785                         op->o_tmpfree( op->orb_edn.bv_val, op->o_tmpmemctx );
1786                         BER_BVZERO( &op->orb_edn );
1787                         op->o_conn->c_authmech = op->o_conn->c_sasl_bind_mech;
1788                         BER_BVZERO( &op->o_conn->c_sasl_bind_mech );
1789
1790                         op->o_conn->c_sasl_ssf = op->orb_ssf;
1791                         if( op->orb_ssf > op->o_conn->c_ssf ) {
1792                                 op->o_conn->c_ssf = op->orb_ssf;
1793                         }
1794
1795                         if( !BER_BVISEMPTY( &op->o_conn->c_dn ) ) {
1796                                 ber_len_t max = sockbuf_max_incoming_auth;
1797                                 ber_sockbuf_ctrl( op->o_conn->c_sb,
1798                                         LBER_SB_OPT_SET_MAX_INCOMING, &max );
1799                         }
1800
1801                         /* log authorization identity */
1802                         Statslog( LDAP_DEBUG_STATS,
1803                                 "%s BIND dn=\"%s\" mech=%s ssf=%d\n",
1804                                 op->o_log_prefix,
1805                                 BER_BVISNULL( &op->o_conn->c_dn ) ? "<empty>" : op->o_conn->c_dn.bv_val,
1806                                 op->o_conn->c_authmech.bv_val, op->orb_ssf, 0 );
1807
1808                         Debug( LDAP_DEBUG_TRACE,
1809                                 "do_bind: SASL/%s bind: dn=\"%s\" ssf=%d\n",
1810                                 op->o_conn->c_authmech.bv_val,
1811                                 BER_BVISNULL( &op->o_conn->c_dn ) ? "<empty>" : op->o_conn->c_dn.bv_val,
1812                                 op->orb_ssf );
1813
1814                 } else if ( rs->sr_err != LDAP_SASL_BIND_IN_PROGRESS ) {
1815                         if ( !BER_BVISNULL( &op->o_conn->c_sasl_bind_mech ) ) {
1816                                 free( op->o_conn->c_sasl_bind_mech.bv_val );
1817                                 BER_BVZERO( &op->o_conn->c_sasl_bind_mech );
1818                         }
1819                 }
1820         }
1821         ldap_pvt_thread_mutex_unlock( &op->o_conn->c_mutex );
1822
1823         ch_free( op->o_callback );
1824         op->o_callback = NULL;
1825
1826         return SLAP_CB_CONTINUE;
1827 }
1828
1829 static void connection_op_queue( Operation *op )
1830 {
1831         ber_tag_t tag = op->o_tag;
1832
1833         if (tag == LDAP_REQ_BIND) {
1834                 slap_callback *sc = ch_calloc( 1, sizeof( slap_callback ));
1835                 sc->sc_response = connection_bind_cb;
1836                 sc->sc_cleanup = connection_bind_cleanup_cb;
1837                 sc->sc_next = op->o_callback;
1838                 op->o_callback = sc;
1839                 op->o_conn->c_conn_state = SLAP_C_BINDING;
1840         }
1841
1842         if (!op->o_dn.bv_len) {
1843                 op->o_authz = op->o_conn->c_authz;
1844                 if ( BER_BVISNULL( &op->o_conn->c_sasl_authz_dn )) {
1845                         ber_dupbv( &op->o_dn, &op->o_conn->c_dn );
1846                         ber_dupbv( &op->o_ndn, &op->o_conn->c_ndn );
1847                 } else {
1848                         ber_dupbv( &op->o_dn, &op->o_conn->c_sasl_authz_dn );
1849                         ber_dupbv( &op->o_ndn, &op->o_conn->c_sasl_authz_dn );
1850                 }
1851         }
1852
1853         op->o_authtype = op->o_conn->c_authtype;
1854         ber_dupbv( &op->o_authmech, &op->o_conn->c_authmech );
1855
1856         if (!op->o_protocol) {
1857                 op->o_protocol = op->o_conn->c_protocol
1858                         ? op->o_conn->c_protocol : LDAP_VERSION3;
1859         }
1860
1861         if (op->o_conn->c_conn_state == SLAP_C_INACTIVE &&
1862                 op->o_protocol > LDAP_VERSION2)
1863         {
1864                 op->o_conn->c_conn_state = SLAP_C_ACTIVE;
1865         }
1866
1867         op->o_connid = op->o_conn->c_connid;
1868         connection_init_log_prefix( op );
1869
1870         LDAP_STAILQ_INSERT_TAIL( &op->o_conn->c_ops, op, o_next );
1871 }
1872
1873 static int connection_op_activate( Operation *op )
1874 {
1875         int rc;
1876
1877         connection_op_queue( op );
1878
1879         rc = ldap_pvt_thread_pool_submit( &connection_pool,
1880                 connection_operation, (void *) op );
1881
1882         if ( rc != 0 ) {
1883                 Debug( LDAP_DEBUG_ANY,
1884                         "connection_op_activate: submit failed (%d) for conn=%lu\n",
1885                         rc, op->o_connid, 0 );
1886                 /* should move op to pending list */
1887         }
1888
1889         return rc;
1890 }
1891
1892 int connection_write(ber_socket_t s)
1893 {
1894         Connection *c;
1895         Operation *op;
1896
1897         assert( connections != NULL );
1898
1899         slapd_clr_write( s, 0 );
1900
1901         c = connection_get( s );
1902         if( c == NULL ) {
1903                 Debug( LDAP_DEBUG_ANY,
1904                         "connection_write(%ld): no connection!\n",
1905                         (long)s, 0, 0 );
1906                 return -1;
1907         }
1908
1909         c->c_n_write++;
1910
1911         Debug( LDAP_DEBUG_TRACE,
1912                 "connection_write(%d): waking output for id=%lu\n",
1913                 s, c->c_connid, 0 );
1914         ldap_pvt_thread_cond_signal( &c->c_write_cv );
1915
1916         if ( ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_NEEDS_READ, NULL ) ) {
1917                 slapd_set_read( s, 1 );
1918         }
1919         if ( ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_NEEDS_WRITE, NULL ) ) {
1920                 slapd_set_write( s, 1 );
1921         }
1922
1923         /* If there are ops pending because of a writewaiter,
1924          * start one up.
1925          */
1926         while ((op = LDAP_STAILQ_FIRST( &c->c_pending_ops )) != NULL) {
1927                 if ( !c->c_writewaiter ) break;
1928                 if ( c->c_n_ops_executing > connection_pool_max/2 ) break;
1929
1930                 LDAP_STAILQ_REMOVE_HEAD( &c->c_pending_ops, o_next );
1931                 LDAP_STAILQ_NEXT(op, o_next) = NULL;
1932
1933                 /* pending operations should not be marked for abandonment */
1934                 assert(!op->o_abandon);
1935
1936                 c->c_n_ops_pending--;
1937                 c->c_n_ops_executing++;
1938
1939                 connection_op_activate( op );
1940
1941                 break;
1942         }
1943
1944         connection_return( c );
1945         return 0;
1946 }
1947
1948 void
1949 connection_fake_init(
1950         Connection *conn,
1951         Operation *op,
1952         void *ctx )
1953 {
1954         conn->c_connid = -1;
1955         conn->c_send_ldap_result = slap_send_ldap_result;
1956         conn->c_send_search_entry = slap_send_search_entry;
1957         conn->c_send_search_reference = slap_send_search_reference;
1958         conn->c_listener = (Listener *)&dummy_list;
1959         conn->c_peer_domain = slap_empty_bv;
1960         conn->c_peer_name = slap_empty_bv;
1961
1962         memset(op, 0, OPERATION_BUFFER_SIZE);
1963         op->o_hdr = (Opheader *)(op+1);
1964         op->o_controls = (void **)(op->o_hdr+1);
1965         /* set memory context */
1966         op->o_tmpmemctx = slap_sl_mem_create(SLAP_SLAB_SIZE, SLAP_SLAB_STACK, ctx);
1967         op->o_tmpmfuncs = &slap_sl_mfuncs;
1968         op->o_threadctx = ctx;
1969         op->o_tid = ldap_pvt_thread_pool_tid( ctx );
1970
1971         op->o_conn = conn;
1972         op->o_connid = op->o_conn->c_connid;
1973         connection_init_log_prefix( op );
1974
1975 #ifdef LDAP_SLAPI
1976         slapi_int_create_object_extensions( SLAPI_X_EXT_CONNECTION, conn );
1977         slapi_int_create_object_extensions( SLAPI_X_EXT_OPERATION, op );
1978 #endif /* LDAP_SLAPI */
1979
1980         slap_op_time( &op->o_time, &op->o_tincr );
1981 }
1982
1983 void
1984 connection_assign_nextid( Connection *conn )
1985 {
1986         ldap_pvt_thread_mutex_lock( &conn_nextid_mutex );
1987         conn->c_connid = conn_nextid++;
1988         ldap_pvt_thread_mutex_unlock( &conn_nextid_mutex );
1989 }