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                         Statslog( LDAP_DEBUG_STATS, "conn=%lu fd=%ld closed\n",
 751                                 connid, (long) sd, 0, 0, 0 );
 752                 } else {
 753                         Statslog( LDAP_DEBUG_STATS, "conn=%lu fd=%ld closed (%s)\n",
 754                                 connid, (long) sd, close_reason, 0, 0 );
 755                 }
 756         }
 757 }
 758
 759 int connection_state_closing( Connection *c )
 760 {
 761         /* c_mutex must be locked by caller */
 762
 763         int state;
 764         assert( c != NULL );
 765         assert( c->c_struct_state == SLAP_C_USED );
 766
 767         state = c->c_conn_state;
 768
 769         assert( state != SLAP_C_INVALID );
 770
 771         return state == SLAP_C_CLOSING;
 772 }
 773
 774 static void connection_abandon( Connection *c )
 775 {
 776         /* c_mutex must be locked by caller */
 777
 778         Operation *o, *next, op = {0};
 779         Opheader ohdr = {0};
 780         SlapReply rs = {0};
 781
 782         op.o_hdr = &ohdr;
 783         op.o_conn = c;
 784         op.o_connid = c->c_connid;
 785         op.o_tag = LDAP_REQ_ABANDON;
 786
 787         for ( o = LDAP_STAILQ_FIRST( &c->c_ops ); o; o=next ) {
 788                 next = LDAP_STAILQ_NEXT( o, o_next );
 789                 op.orn_msgid = o->o_msgid;
 790                 o->o_abandon = 1;
 791                 op.o_bd = frontendDB;
 792                 frontendDB->be_abandon( &op, &rs );
 793         }
 794
 795 #ifdef LDAP_X_TXN
 796         /* remove operations in pending transaction */
 797         while ( (o = LDAP_STAILQ_FIRST( &c->c_txn_ops )) != NULL) {
 798                 LDAP_STAILQ_REMOVE_HEAD( &c->c_txn_ops, o_next );
 799                 LDAP_STAILQ_NEXT(o, o_next) = NULL;
 800                 slap_op_free( o );
 801         }
 802
 803         /* clear transaction */
 804         c->c_txn_backend = NULL;
 805         c->c_txn = CONN_TXN_INACTIVE;
 806 #endif
 807
 808         /* remove pending operations */
 809         while ( (o = LDAP_STAILQ_FIRST( &c->c_pending_ops )) != NULL) {
 810                 LDAP_STAILQ_REMOVE_HEAD( &c->c_pending_ops, o_next );
 811                 LDAP_STAILQ_NEXT(o, o_next) = NULL;
 812                 slap_op_free( o );
 813         }
 814 }
 815
 816 void connection_closing( Connection *c, const char *why )
 817 {
 818         assert( connections != NULL );
 819         assert( c != NULL );
 820         assert( c->c_struct_state == SLAP_C_USED );
 821         assert( c->c_conn_state != SLAP_C_INVALID );
 822
 823         /* c_mutex must be locked by caller */
 824
 825         if( c->c_conn_state != SLAP_C_CLOSING ) {
 826                 ber_socket_t    sd;
 827
 828                 ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_GET_FD, &sd );
 829                 Debug( LDAP_DEBUG_TRACE,
 830                         "connection_closing: readying conn=%lu sd=%d for close\n",
 831                         c->c_connid, sd, 0 );
 832                 /* update state to closing */
 833                 c->c_conn_state = SLAP_C_CLOSING;
 834                 c->c_close_reason = why;
 835
 836                 /* don't listen on this port anymore */
 837                 slapd_clr_read( sd, 0 );
 838
 839                 /* abandon active operations */
 840                 connection_abandon( c );
 841
 842                 /* wake write blocked operations */
 843                 if ( c->c_writewaiter ) {
 844                         ldap_pvt_thread_cond_signal( &c->c_write_cv );
 845                         /* ITS#4667 this may allow another thread to drop into
 846                          * connection_resched / connection_close before we
 847                          * finish, but that's OK.
 848                          */
 849                         slapd_clr_write( sd, 1 );
 850                         ldap_pvt_thread_mutex_unlock( &c->c_mutex );
 851                         ldap_pvt_thread_mutex_lock( &c->c_write_mutex );
 852                         ldap_pvt_thread_mutex_lock( &c->c_mutex );
 853                         ldap_pvt_thread_mutex_unlock( &c->c_write_mutex );
 854                 } else {
 855                         slapd_clr_write( sd, 1 );
 856                 }
 857
 858         } else if( why == NULL && c->c_close_reason == conn_lost_str ) {
 859                 /* Client closed connection after doing Unbind. */
 860                 c->c_close_reason = NULL;
 861         }
 862 }
 863
 864 static void
 865 connection_close( Connection *c )
 866 {
 867         ber_socket_t    sd = AC_SOCKET_INVALID;
 868
 869         assert( connections != NULL );
 870         assert( c != NULL );
 871
 872         /* ITS#4667 we may have gotten here twice */
 873         if ( c->c_conn_state == SLAP_C_INVALID )
 874                 return;
 875
 876         assert( c->c_struct_state == SLAP_C_USED );
 877         assert( c->c_conn_state == SLAP_C_CLOSING );
 878
 879         /* NOTE: c_mutex should be locked by caller */
 880
 881         /* NOTE: don't get the file descriptor if not needed */
 882         if ( LogTest( LDAP_DEBUG_TRACE ) ) {
 883                 ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_GET_FD, &sd );
 884         }
 885
 886         if ( !LDAP_STAILQ_EMPTY(&c->c_ops) ||
 887                 !LDAP_STAILQ_EMPTY(&c->c_pending_ops) )
 888         {
 889                 Debug( LDAP_DEBUG_TRACE,
 890                         "connection_close: deferring conn=%lu sd=%d\n",
 891                         c->c_connid, sd, 0 );
 892                 return;
 893         }
 894
 895         Debug( LDAP_DEBUG_TRACE, "connection_close: conn=%lu sd=%d\n",
 896                 c->c_connid, sd, 0 );
 897
 898         connection_destroy( c );
 899 }
 900
 901 unsigned long connections_nextid(void)
 902 {
 903         unsigned long id;
 904         assert( connections != NULL );
 905
 906         ldap_pvt_thread_mutex_lock( &conn_nextid_mutex );
 907
 908         id = conn_nextid;
 909
 910         ldap_pvt_thread_mutex_unlock( &conn_nextid_mutex );
 911
 912         return id;
 913 }
 914
 915 Connection* connection_first( ber_socket_t *index )
 916 {
 917         assert( connections != NULL );
 918         assert( index != NULL );
 919
 920         ldap_pvt_thread_mutex_lock( &connections_mutex );
 921         for( *index = 0; *index < dtblsize; (*index)++) {
 922                 if( connections[*index].c_struct_state != SLAP_C_UNINITIALIZED ) {
 923                         break;
 924                 }
 925         }
 926         ldap_pvt_thread_mutex_unlock( &connections_mutex );
 927
 928         return connection_next(NULL, index);
 929 }
 930
 931 Connection* connection_next( Connection *c, ber_socket_t *index )
 932 {
 933         assert( connections != NULL );
 934         assert( index != NULL );
 935         assert( *index <= dtblsize );
 936
 937         if( c != NULL ) ldap_pvt_thread_mutex_unlock( &c->c_mutex );
 938
 939         c = NULL;
 940
 941         ldap_pvt_thread_mutex_lock( &connections_mutex );
 942         for(; *index < dtblsize; (*index)++) {
 943                 int c_struct;
 944                 if( connections[*index].c_struct_state == SLAP_C_UNINITIALIZED ) {
 945                         assert( connections[*index].c_conn_state == SLAP_C_INVALID );
 946 #ifdef HAVE_WINSOCK
 947                         break;
 948 #else
 949                         continue;
 950 #endif
 951                 }
 952
 953                 if( connections[*index].c_struct_state == SLAP_C_USED ) {
 954                         assert( connections[*index].c_conn_state != SLAP_C_INVALID );
 955                         c = &connections[(*index)++];
 956                         if ( ldap_pvt_thread_mutex_trylock( &c->c_mutex )) {
 957                                 /* avoid deadlock */
 958                                 ldap_pvt_thread_mutex_unlock( &connections_mutex );
 959                                 ldap_pvt_thread_mutex_lock( &c->c_mutex );
 960                                 ldap_pvt_thread_mutex_lock( &connections_mutex );
 961                                 if ( c->c_struct_state != SLAP_C_USED ) {
 962                                         ldap_pvt_thread_mutex_unlock( &c->c_mutex );
 963                                         c = NULL;
 964                                         continue;
 965                                 }
 966                         }
 967                         break;
 968                 }
 969
 970                 c_struct = connections[*index].c_struct_state;
 971                 if ( c_struct == SLAP_C_PENDING )
 972                         continue;
 973                 assert( c_struct == SLAP_C_UNUSED );
 974                 assert( connections[*index].c_conn_state == SLAP_C_INVALID );
 975         }
 976
 977         ldap_pvt_thread_mutex_unlock( &connections_mutex );
 978         return c;
 979 }
 980
 981 void connection_done( Connection *c )
 982 {
 983         assert( connections != NULL );
 984
 985         if( c != NULL ) ldap_pvt_thread_mutex_unlock( &c->c_mutex );
 986 }
 987
 988 /*
 989  * connection_activity - handle the request operation op on connection
 990  * conn.  This routine figures out what kind of operation it is and
 991  * calls the appropriate stub to handle it.
 992  */
 993
 994 #ifdef SLAPD_MONITOR
 995 /* FIXME: returns 0 in case of failure */
 996 #define INCR_OP_INITIATED(index) \
 997         do { \
 998                 ldap_pvt_thread_mutex_lock( &slap_counters.sc_ops_mutex ); \
 999                 ldap_pvt_mp_add_ulong(slap_counters.sc_ops_initiated_[(index)], 1); \
1000                 ldap_pvt_thread_mutex_unlock( &slap_counters.sc_ops_mutex ); \
1001         } 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_mp_add_ulong(slap_counters.sc_ops_completed_[(index)], 1); \
1007                 ldap_pvt_thread_mutex_unlock( &slap_counters.sc_ops_mutex ); \
1008         } while (0)
1009 #else /* !SLAPD_MONITOR */
1010 #define INCR_OP_INITIATED(index) do { } while (0)
1011 #define INCR_OP_COMPLETED(index) \
1012         do { \
1013                 ldap_pvt_thread_mutex_lock( &slap_counters.sc_ops_mutex ); \
1014                 ldap_pvt_mp_add_ulong(slap_counters.sc_ops_completed, 1); \
1015                 ldap_pvt_thread_mutex_unlock( &slap_counters.sc_ops_mutex ); \
1016         } while (0)
1017 #endif /* !SLAPD_MONITOR */
1018
1019 /*
1020  * NOTE: keep in sync with enum in slapd.h
1021  */
1022 static BI_op_func *opfun[] = {
1023         do_bind,
1024         do_unbind,
1025         do_add,
1026         do_delete,
1027         do_modrdn,
1028         do_modify,
1029         do_compare,
1030         do_search,
1031         do_abandon,
1032         do_extended,
1033         NULL
1034 };
1035
1036 static void *
1037 connection_operation( void *ctx, void *arg_v )
1038 {
1039         int rc = LDAP_OTHER;
1040         Operation *op = arg_v;
1041         SlapReply rs = {REP_RESULT};
1042         ber_tag_t tag = op->o_tag;
1043         slap_op_t opidx = SLAP_OP_LAST;
1044         Connection *conn = op->o_conn;
1045         void *memctx = NULL;
1046         void *memctx_null = NULL;
1047         ber_len_t memsiz;
1048
1049         ldap_pvt_thread_mutex_lock( &slap_counters.sc_ops_mutex );
1050         /* FIXME: returns 0 in case of failure */
1051         ldap_pvt_mp_add_ulong(slap_counters.sc_ops_initiated, 1);
1052         ldap_pvt_thread_mutex_unlock( &slap_counters.sc_ops_mutex );
1053
1054         op->o_threadctx = ctx;
1055         op->o_tid = ldap_pvt_thread_pool_tid( ctx );
1056
1057         switch ( tag ) {
1058         case LDAP_REQ_BIND:
1059         case LDAP_REQ_UNBIND:
1060         case LDAP_REQ_ADD:
1061         case LDAP_REQ_DELETE:
1062         case LDAP_REQ_MODDN:
1063         case LDAP_REQ_MODIFY:
1064         case LDAP_REQ_COMPARE:
1065         case LDAP_REQ_SEARCH:
1066         case LDAP_REQ_ABANDON:
1067         case LDAP_REQ_EXTENDED:
1068                 break;
1069         default:
1070                 Debug( LDAP_DEBUG_ANY, "connection_operation: "
1071                         "conn %lu unknown LDAP request 0x%lx\n",
1072                         conn->c_connid, tag, 0 );
1073                 op->o_tag = LBER_ERROR;
1074                 rs.sr_err = LDAP_PROTOCOL_ERROR;
1075                 rs.sr_text = "unknown LDAP request";
1076                 send_ldap_disconnect( op, &rs );
1077                 rc = SLAPD_DISCONNECT;
1078                 goto operations_error;
1079         }
1080
1081         if( conn->c_sasl_bind_in_progress && tag != LDAP_REQ_BIND ) {
1082                 Debug( LDAP_DEBUG_ANY, "connection_operation: "
1083                         "error: SASL bind in progress (tag=%ld).\n",
1084                         (long) tag, 0, 0 );
1085                 send_ldap_error( op, &rs, LDAP_OPERATIONS_ERROR,
1086                         "SASL bind in progress" );
1087                 rc = LDAP_OPERATIONS_ERROR;
1088                 goto operations_error;
1089         }
1090
1091 #ifdef LDAP_X_TXN
1092         if (( conn->c_txn == CONN_TXN_SPECIFY ) && (
1093                 ( tag == LDAP_REQ_ADD ) ||
1094                 ( tag == LDAP_REQ_DELETE ) ||
1095                 ( tag == LDAP_REQ_MODIFY ) ||
1096                 ( tag == LDAP_REQ_MODRDN )))
1097         {
1098                 /* Disable SLAB allocator for all update operations
1099                         issued inside of a transaction */
1100                 op->o_tmpmemctx = NULL;
1101                 op->o_tmpmfuncs = &ch_mfuncs;
1102         } else
1103 #endif
1104         {
1105         /* We can use Thread-Local storage for most mallocs. We can
1106          * also use TL for ber parsing, but not on Add or Modify.
1107          */
1108 #if 0
1109         memsiz = ber_len( op->o_ber ) * 64;
1110         if ( SLAP_SLAB_SIZE > memsiz ) memsiz = SLAP_SLAB_SIZE;
1111 #endif
1112         memsiz = SLAP_SLAB_SIZE;
1113
1114         memctx = slap_sl_mem_create( memsiz, SLAP_SLAB_STACK, ctx );
1115         op->o_tmpmemctx = memctx;
1116         op->o_tmpmfuncs = &slap_sl_mfuncs;
1117         if ( tag != LDAP_REQ_ADD && tag != LDAP_REQ_MODIFY ) {
1118                 /* Note - the ber and its buffer are already allocated from
1119                  * regular memory; this only affects subsequent mallocs that
1120                  * ber_scanf may invoke.
1121                  */
1122                 ber_set_option( op->o_ber, LBER_OPT_BER_MEMCTX, &memctx );
1123         }
1124         }
1125
1126         opidx = slap_req2op( tag );
1127         assert( opidx != SLAP_OP_LAST );
1128         INCR_OP_INITIATED( opidx );
1129         rc = (*(opfun[opidx]))( op, &rs );
1130
1131 operations_error:
1132         if ( rc == SLAPD_DISCONNECT ) {
1133                 tag = LBER_ERROR;
1134
1135         } else if ( opidx != SLAP_OP_LAST ) {
1136                 /* increment completed operations count
1137                  * only if operation was initiated
1138                  * and rc != SLAPD_DISCONNECT */
1139                 INCR_OP_COMPLETED( opidx );
1140         }
1141
1142         if ( op->o_cancel == SLAP_CANCEL_REQ ) {
1143                 if ( rc == SLAPD_ABANDON ) {
1144                         op->o_cancel = SLAP_CANCEL_ACK;
1145                 } else {
1146                         op->o_cancel = LDAP_TOO_LATE;
1147                 }
1148         }
1149
1150         while ( op->o_cancel != SLAP_CANCEL_NONE &&
1151                 op->o_cancel != SLAP_CANCEL_DONE )
1152         {
1153                 ldap_pvt_thread_yield();
1154         }
1155
1156         ldap_pvt_thread_mutex_lock( &conn->c_mutex );
1157
1158         ber_set_option( op->o_ber, LBER_OPT_BER_MEMCTX, &memctx_null );
1159
1160         LDAP_STAILQ_REMOVE( &conn->c_ops, op, slap_op, o_next);
1161         LDAP_STAILQ_NEXT(op, o_next) = NULL;
1162         slap_op_free( op );
1163         conn->c_n_ops_executing--;
1164         conn->c_n_ops_completed++;
1165
1166         switch( tag ) {
1167         case LBER_ERROR:
1168         case LDAP_REQ_UNBIND:
1169                 /* c_mutex is locked */
1170                 connection_closing( conn,
1171                         tag == LDAP_REQ_UNBIND ? NULL : "operations error" );
1172                 break;
1173         }
1174
1175         connection_resched( conn );
1176         ldap_pvt_thread_mutex_unlock( &conn->c_mutex );
1177         return NULL;
1178 }
1179
1180 static const Listener dummy_list = { BER_BVC(""), BER_BVC("") };
1181
1182 int connection_client_setup(
1183         ber_socket_t s,
1184         ldap_pvt_thread_start_t *func,
1185         void *arg )
1186 {
1187         int rc;
1188         Connection *c;
1189
1190         rc = connection_init( s, (Listener *)&dummy_list, "", "",
1191                 CONN_IS_CLIENT, 0, NULL );
1192         if ( rc < 0 ) return -1;
1193
1194         c = connection_get( s );
1195         c->c_clientfunc = func;
1196         c->c_clientarg = arg;
1197
1198         slapd_add_internal( s, 0 );
1199         slapd_set_read( s, 1 );
1200         connection_return( c );
1201         return 0;
1202 }
1203
1204 void connection_client_enable(
1205         ber_socket_t s )
1206 {
1207         slapd_set_read( s, 1 );
1208 }
1209
1210 void connection_client_stop(
1211         ber_socket_t s )
1212 {
1213         Connection *c;
1214         Sockbuf *sb;
1215
1216         /* get (locked) connection */
1217         c = connection_get( s );
1218
1219         assert( c->c_conn_state == SLAP_C_CLIENT );
1220
1221         c->c_listener = NULL;
1222         c->c_conn_state = SLAP_C_INVALID;
1223         c->c_struct_state = SLAP_C_UNUSED;
1224         c->c_close_reason = "?";                        /* should never be needed */
1225         sb = c->c_sb;
1226         c->c_sb = ber_sockbuf_alloc( );
1227         {
1228                 ber_len_t max = sockbuf_max_incoming;
1229                 ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_SET_MAX_INCOMING, &max );
1230         }
1231         slapd_remove( s, sb, 0, 1, 0 );
1232
1233         connection_return( c );
1234 }
1235
1236 #ifdef SLAP_LIGHTWEIGHT_DISPATCHER
1237
1238 static int connection_read( ber_socket_t s, conn_readinfo *cri );
1239
1240 static void* connection_read_thread( void* ctx, void* argv )
1241 {
1242         int rc ;
1243         conn_readinfo cri = { NULL, NULL, NULL, 0 };
1244         ber_socket_t s = (long)argv;
1245
1246         /*
1247          * read incoming LDAP requests. If there is more than one,
1248          * the first one is returned with new_op
1249          */
1250         if( ( rc = connection_read( s, &cri ) ) < 0 ) {
1251                 Debug( LDAP_DEBUG_CONNS, "connection_read(%d) error\n", s, 0, 0 );
1252                 return (void*)(long)rc;
1253         }
1254
1255         /* execute a single queued request in the same thread */
1256         if( cri.op && !cri.nullop ) {
1257                 rc = (long)connection_operation( ctx, cri.op );
1258         } else if ( cri.func ) {
1259                 rc = (long)cri.func( ctx, cri.arg );
1260         }
1261
1262         return (void*)(long)rc;
1263 }
1264
1265 int connection_read_activate( ber_socket_t s )
1266 {
1267         int rc;
1268
1269         /*
1270          * suspend reading on this file descriptor until a connection processing
1271          * thread reads data on it. Otherwise the listener thread will repeatedly
1272          * submit the same event on it to the pool.
1273          */
1274         rc = slapd_clr_read( s, 0 );
1275         if ( rc )
1276                 return rc;
1277
1278         rc = ldap_pvt_thread_pool_submit( &connection_pool,
1279                 connection_read_thread, (void *)(long)s );
1280
1281         if( rc != 0 ) {
1282                 Debug( LDAP_DEBUG_ANY,
1283                         "connection_read_activate(%d): submit failed (%d)\n",
1284                         s, rc, 0 );
1285         }
1286
1287         return rc;
1288 }
1289 #endif
1290
1291 #ifdef SLAP_LIGHTWEIGHT_DISPATCHER
1292 static int
1293 connection_read( ber_socket_t s, conn_readinfo *cri )
1294 #else
1295 int connection_read(ber_socket_t s)
1296 #endif
1297 {
1298         int rc = 0;
1299         Connection *c;
1300
1301         assert( connections != NULL );
1302
1303         /* get (locked) connection */
1304         c = connection_get( s );
1305
1306         if( c == NULL ) {
1307                 Debug( LDAP_DEBUG_ANY,
1308                         "connection_read(%ld): no connection!\n",
1309                         (long) s, 0, 0 );
1310
1311                 return -1;
1312         }
1313
1314         c->c_n_read++;
1315
1316         if( c->c_conn_state == SLAP_C_CLOSING ) {
1317                 Debug( LDAP_DEBUG_TRACE,
1318                         "connection_read(%d): closing, ignoring input for id=%lu\n",
1319                         s, c->c_connid, 0 );
1320                 connection_return( c );
1321                 return 0;
1322         }
1323
1324         if ( c->c_conn_state == SLAP_C_CLIENT ) {
1325 #ifdef SLAP_LIGHTWEIGHT_DISPATCHER
1326                 cri->func = c->c_clientfunc;
1327                 cri->arg = c->c_clientarg;
1328                 /* read should already be cleared */
1329 #else
1330                 slapd_clr_read( s, 0 );
1331                 ldap_pvt_thread_pool_submit( &connection_pool,
1332                         c->c_clientfunc, c->c_clientarg );
1333 #endif
1334                 connection_return( c );
1335                 return 0;
1336         }
1337
1338         Debug( LDAP_DEBUG_TRACE,
1339                 "connection_read(%d): checking for input on id=%lu\n",
1340                 s, c->c_connid, 0 );
1341
1342 #ifdef HAVE_TLS
1343         if ( c->c_is_tls && c->c_needs_tls_accept ) {
1344                 rc = ldap_pvt_tls_accept( c->c_sb, slap_tls_ctx );
1345                 if ( rc < 0 ) {
1346                         Debug( LDAP_DEBUG_TRACE,
1347                                 "connection_read(%d): TLS accept failure "
1348                                 "error=%d id=%lu, closing\n",
1349                                 s, rc, c->c_connid );
1350
1351                         c->c_needs_tls_accept = 0;
1352                         /* c_mutex is locked */
1353                         connection_closing( c, "TLS negotiation failure" );
1354                         connection_close( c );
1355                         connection_return( c );
1356                         return 0;
1357
1358                 } else if ( rc == 0 ) {
1359                         void *ssl;
1360                         struct berval authid = BER_BVNULL;
1361
1362                         c->c_needs_tls_accept = 0;
1363
1364                         /* we need to let SASL know */
1365                         ssl = ldap_pvt_tls_sb_ctx( c->c_sb );
1366
1367                         c->c_tls_ssf = (slap_ssf_t) ldap_pvt_tls_get_strength( ssl );
1368                         if( c->c_tls_ssf > c->c_ssf ) {
1369                                 c->c_ssf = c->c_tls_ssf;
1370                         }
1371
1372                         rc = dnX509peerNormalize( ssl, &authid );
1373                         if ( rc != LDAP_SUCCESS ) {
1374                                 Debug( LDAP_DEBUG_TRACE, "connection_read(%d): "
1375                                         "unable to get TLS client DN, error=%d id=%lu\n",
1376                                         s, rc, c->c_connid );
1377                         }
1378                         Statslog( LDAP_DEBUG_STATS,
1379                                 "conn=%lu fd=%d TLS established tls_ssf=%u ssf=%u\n",
1380                             c->c_connid, (int) s, c->c_tls_ssf, c->c_ssf, 0 );
1381                         slap_sasl_external( c, c->c_tls_ssf, &authid );
1382                         if ( authid.bv_val ) free( authid.bv_val );
1383                 }
1384
1385                 /* if success and data is ready, fall thru to data input loop */
1386                 if( !ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_DATA_READY, NULL ) )
1387                 {
1388 #ifdef SLAP_LIGHTWEIGHT_DISPATCHER
1389                         slapd_set_read( s, 1 );
1390 #endif
1391
1392                         connection_return( c );
1393                         return 0;
1394                 }
1395         }
1396 #endif
1397
1398 #ifdef HAVE_CYRUS_SASL
1399         if ( c->c_sasl_layers ) {
1400                 /* If previous layer is not removed yet, give up for now */
1401                 if ( !c->c_sasl_sockctx ) {
1402 #ifdef SLAP_LIGHTWEIGHT_DISPATCHER
1403                         slapd_set_read( s, 1 );
1404 #endif
1405
1406                         connection_return( c );
1407                         return 0;
1408                 }
1409
1410                 c->c_sasl_layers = 0;
1411
1412                 rc = ldap_pvt_sasl_install( c->c_sb, c->c_sasl_sockctx );
1413                 if( rc != LDAP_SUCCESS ) {
1414                         Debug( LDAP_DEBUG_TRACE,
1415                                 "connection_read(%d): SASL install error "
1416                                 "error=%d id=%lu, closing\n",
1417                                 s, rc, c->c_connid );
1418
1419                         /* c_mutex is locked */
1420                         connection_closing( c, "SASL layer install failure" );
1421                         connection_close( c );
1422                         connection_return( c );
1423                         return 0;
1424                 }
1425         }
1426 #endif
1427
1428 #define CONNECTION_INPUT_LOOP 1
1429 /* #define      DATA_READY_LOOP 1 */
1430
1431         do {
1432                 /* How do we do this without getting into a busy loop ? */
1433 #ifdef SLAP_LIGHTWEIGHT_DISPATCHER
1434                 rc = connection_input( c, cri );
1435 #else
1436                 rc = connection_input( c );
1437 #endif
1438         }
1439 #ifdef DATA_READY_LOOP
1440         while( !rc && ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_DATA_READY, NULL ));
1441 #elif CONNECTION_INPUT_LOOP
1442         while(!rc);
1443 #else
1444         while(0);
1445 #endif
1446
1447         if( rc < 0 ) {
1448                 Debug( LDAP_DEBUG_CONNS,
1449                         "connection_read(%d): input error=%d id=%lu, closing.\n",
1450                         s, rc, c->c_connid );
1451
1452                 /* c_mutex is locked */
1453                 connection_closing( c, conn_lost_str );
1454                 connection_close( c );
1455                 connection_return( c );
1456                 return 0;
1457         }
1458
1459 #ifdef SLAP_LIGHTWEIGHT_DISPATCHER
1460         if ( ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_NEEDS_WRITE, NULL ) ) {
1461                 slapd_set_write( s, 0 );
1462         }
1463
1464         slapd_set_read( s, 1 );
1465 #else
1466         if ( ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_NEEDS_READ, NULL ) ) {
1467                 slapd_set_read( s, 1 );
1468         }
1469
1470         if ( ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_NEEDS_WRITE, NULL ) ) {
1471                 slapd_set_write( s, 1 );
1472         }
1473 #endif
1474
1475         connection_return( c );
1476
1477         return 0;
1478 }
1479
1480 static int
1481 #ifdef SLAP_LIGHTWEIGHT_DISPATCHER
1482 connection_input( Connection *conn , conn_readinfo *cri )
1483 #else
1484 connection_input( Connection *conn )
1485 #endif
1486 {
1487         Operation *op;
1488         ber_tag_t       tag;
1489         ber_len_t       len;
1490         ber_int_t       msgid;
1491         BerElement      *ber;
1492         int             rc;
1493 #ifdef LDAP_CONNECTIONLESS
1494         Sockaddr        peeraddr;
1495         char            *cdn = NULL;
1496 #endif
1497         char *defer = NULL;
1498
1499         if ( conn->c_currentber == NULL &&
1500                 ( conn->c_currentber = ber_alloc()) == NULL )
1501         {
1502                 Debug( LDAP_DEBUG_ANY, "ber_alloc failed\n", 0, 0, 0 );
1503                 return -1;
1504         }
1505
1506         sock_errset(0);
1507
1508 #ifdef LDAP_CONNECTIONLESS
1509         if ( conn->c_is_udp ) {
1510                 char peername[sizeof("IP=255.255.255.255:65336")];
1511
1512                 len = ber_int_sb_read(conn->c_sb, &peeraddr, sizeof(struct sockaddr));
1513                 if (len != sizeof(struct sockaddr)) return 1;
1514
1515                 sprintf( peername, "IP=%s:%d",
1516                         inet_ntoa( peeraddr.sa_in_addr.sin_addr ),
1517                         (unsigned) ntohs( peeraddr.sa_in_addr.sin_port ) );
1518                 Statslog( LDAP_DEBUG_STATS,
1519                         "conn=%lu UDP request from %s (%s) accepted.\n",
1520                         conn->c_connid, peername, conn->c_sock_name.bv_val, 0, 0 );
1521         }
1522 #endif
1523
1524         tag = ber_get_next( conn->c_sb, &len, conn->c_currentber );
1525         if ( tag != LDAP_TAG_MESSAGE ) {
1526                 int err = sock_errno();
1527                 ber_socket_t    sd;
1528
1529                 ber_sockbuf_ctrl( conn->c_sb, LBER_SB_OPT_GET_FD, &sd );
1530
1531                 if ( err != EWOULDBLOCK && err != EAGAIN ) {
1532                         /* log, close and send error */
1533                         Debug( LDAP_DEBUG_TRACE,
1534                                 "ber_get_next on fd %d failed errno=%d (%s)\n",
1535                         sd, err, sock_errstr(err) );
1536                         ber_free( conn->c_currentber, 1 );
1537                         conn->c_currentber = NULL;
1538
1539                         return -2;
1540                 }
1541                 return 1;
1542         }
1543
1544         ber = conn->c_currentber;
1545         conn->c_currentber = NULL;
1546
1547         if ( (tag = ber_get_int( ber, &msgid )) != LDAP_TAG_MSGID ) {
1548                 /* log, close and send error */
1549                 Debug( LDAP_DEBUG_ANY, "ber_get_int returns 0x%lx\n", tag, 0, 0 );
1550                 ber_free( ber, 1 );
1551                 return -1;
1552         }
1553
1554         if ( (tag = ber_peek_tag( ber, &len )) == LBER_ERROR ) {
1555                 /* log, close and send error */
1556                 Debug( LDAP_DEBUG_ANY, "ber_peek_tag returns 0x%lx\n", tag, 0, 0 );
1557                 ber_free( ber, 1 );
1558
1559                 return -1;
1560         }
1561
1562 #ifdef LDAP_CONNECTIONLESS
1563         if( conn->c_is_udp ) {
1564                 if( tag == LBER_OCTETSTRING ) {
1565                         ber_get_stringa( ber, &cdn );
1566                         tag = ber_peek_tag(ber, &len);
1567                 }
1568                 if( tag != LDAP_REQ_ABANDON && tag != LDAP_REQ_SEARCH ) {
1569                         Debug( LDAP_DEBUG_ANY, "invalid req for UDP 0x%lx\n", tag, 0, 0 );
1570                         ber_free( ber, 1 );
1571                         return 0;
1572                 }
1573         }
1574 #endif
1575
1576         if(tag == LDAP_REQ_BIND) {
1577                 /* immediately abandon all existing operations upon BIND */
1578                 connection_abandon( conn );
1579         }
1580
1581         op = slap_op_alloc( ber, msgid, tag, conn->c_n_ops_received++ );
1582
1583         op->o_conn = conn;
1584         /* clear state if the connection is being reused from inactive */
1585         if ( conn->c_conn_state == SLAP_C_INACTIVE ) {
1586                 memset( &conn->c_pagedresults_state, 0,
1587                         sizeof( conn->c_pagedresults_state ) );
1588         }
1589
1590         op->o_res_ber = NULL;
1591
1592 #ifdef LDAP_CONNECTIONLESS
1593         if (conn->c_is_udp) {
1594                 if ( cdn ) {
1595                         ber_str2bv( cdn, 0, 1, &op->o_dn );
1596                         op->o_protocol = LDAP_VERSION2;
1597                 }
1598                 op->o_res_ber = ber_alloc_t( LBER_USE_DER );
1599                 if (op->o_res_ber == NULL) return 1;
1600
1601                 rc = ber_write( op->o_res_ber, (char *)&peeraddr,
1602                         sizeof(struct sockaddr), 0 );
1603
1604                 if (rc != sizeof(struct sockaddr)) {
1605                         Debug( LDAP_DEBUG_ANY, "ber_write failed\n", 0, 0, 0 );
1606                         return 1;
1607                 }
1608
1609                 if (op->o_protocol == LDAP_VERSION2) {
1610                         rc = ber_printf(op->o_res_ber, "{is{" /*}}*/, op->o_msgid, "");
1611                         if (rc == -1) {
1612                                 Debug( LDAP_DEBUG_ANY, "ber_write failed\n", 0, 0, 0 );
1613                                 return rc;
1614                         }
1615                 }
1616         }
1617 #endif /* LDAP_CONNECTIONLESS */
1618
1619         rc = 0;
1620
1621         /* Don't process requests when the conn is in the middle of a
1622          * Bind, or if it's closing. Also, don't let any single conn
1623          * use up all the available threads, and don't execute if we're
1624          * currently blocked on output. And don't execute if there are
1625          * already pending ops, let them go first.  Abandon operations
1626          * get exceptions to some, but not all, cases.
1627          */
1628         switch( tag ){
1629         default:
1630                 /* Abandon and Unbind are exempt from these checks */
1631                 if (conn->c_conn_state == SLAP_C_CLOSING) {
1632                         defer = "closing";
1633                         break;
1634                 } else if (conn->c_writewaiter) {
1635                         defer = "awaiting write";
1636                         break;
1637                 } else if (conn->c_n_ops_pending) {
1638                         defer = "pending operations";
1639                         break;
1640                 }
1641                 /* FALLTHRU */
1642         case LDAP_REQ_ABANDON:
1643                 /* Unbind is exempt from these checks */
1644                 if (conn->c_n_ops_executing >= connection_pool_max/2) {
1645                         defer = "too many executing";
1646                         break;
1647                 } else if (conn->c_conn_state == SLAP_C_BINDING) {
1648                         defer = "binding";
1649                         break;
1650                 }
1651                 /* FALLTHRU */
1652         case LDAP_REQ_UNBIND:
1653                 break;
1654         }
1655
1656         if( defer ) {
1657                 int max = conn->c_dn.bv_len
1658                         ? slap_conn_max_pending_auth
1659                         : slap_conn_max_pending;
1660
1661                 Debug( LDAP_DEBUG_ANY,
1662                         "connection_input: conn=%lu deferring operation: %s\n",
1663                         conn->c_connid, defer, 0 );
1664                 conn->c_n_ops_pending++;
1665                 LDAP_STAILQ_INSERT_TAIL( &conn->c_pending_ops, op, o_next );
1666                 rc = ( conn->c_n_ops_pending > max ) ? -1 : 0;
1667
1668         } else {
1669                 conn->c_n_ops_executing++;
1670
1671 #ifdef SLAP_LIGHTWEIGHT_DISPATCHER
1672                 /*
1673                  * The first op will be processed in the same thread context,
1674                  * as long as there is only one op total.
1675                  * Subsequent ops will be submitted to the pool by
1676                  * calling connection_op_activate()
1677                  */
1678                 if ( cri->op == NULL ) {
1679                         /* the first incoming request */
1680                         connection_op_queue( op );
1681                         cri->op = op;
1682                 } else {
1683                         if ( !cri->nullop ) {
1684                                 cri->nullop = 1;
1685                                 rc = ldap_pvt_thread_pool_submit( &connection_pool,
1686                                         connection_operation, (void *) cri->op );
1687                         }
1688                         connection_op_activate( op );
1689                 }
1690 #else
1691                 connection_op_activate( op );
1692 #endif
1693         }
1694
1695 #ifdef NO_THREADS
1696         if ( conn->c_struct_state != SLAP_C_USED ) {
1697                 /* connection must have got closed underneath us */
1698                 return 1;
1699         }
1700 #endif
1701
1702         assert( conn->c_struct_state == SLAP_C_USED );
1703         return rc;
1704 }
1705
1706 static int
1707 connection_resched( Connection *conn )
1708 {
1709         Operation *op;
1710
1711         if( conn->c_conn_state == SLAP_C_CLOSING ) {
1712                 ber_socket_t    sd;
1713                 ber_sockbuf_ctrl( conn->c_sb, LBER_SB_OPT_GET_FD, &sd );
1714
1715                 Debug( LDAP_DEBUG_TRACE, "connection_resched: "
1716                         "attempting closing conn=%lu sd=%d\n",
1717                         conn->c_connid, sd, 0 );
1718                 connection_close( conn );
1719                 return 0;
1720         }
1721
1722         if( conn->c_conn_state != SLAP_C_ACTIVE || conn->c_writewaiter ) {
1723                 /* other states need different handling */
1724                 return 0;
1725         }
1726
1727         while ((op = LDAP_STAILQ_FIRST( &conn->c_pending_ops )) != NULL) {
1728                 if ( conn->c_n_ops_executing > connection_pool_max/2 ) break;
1729
1730                 LDAP_STAILQ_REMOVE_HEAD( &conn->c_pending_ops, o_next );
1731                 LDAP_STAILQ_NEXT(op, o_next) = NULL;
1732
1733                 /* pending operations should not be marked for abandonment */
1734                 assert(!op->o_abandon);
1735
1736                 conn->c_n_ops_pending--;
1737                 conn->c_n_ops_executing++;
1738
1739                 connection_op_activate( op );
1740
1741                 if ( conn->c_conn_state == SLAP_C_BINDING ) break;
1742         }
1743         return 0;
1744 }
1745
1746 static void
1747 connection_init_log_prefix( Operation *op )
1748 {
1749         if ( op->o_connid == (unsigned long)(-1) ) {
1750                 snprintf( op->o_log_prefix, sizeof( op->o_log_prefix ),
1751                         "conn=-1 op=%lu", op->o_opid );
1752
1753         } else {
1754                 snprintf( op->o_log_prefix, sizeof( op->o_log_prefix ),
1755                         "conn=%lu op=%lu", op->o_connid, op->o_opid );
1756         }
1757 }
1758
1759 static int connection_bind_cleanup_cb( Operation *op, SlapReply *rs )
1760 {
1761         op->o_conn->c_sasl_bindop = NULL;
1762
1763         ch_free( op->o_callback );
1764         op->o_callback = NULL;
1765
1766         return SLAP_CB_CONTINUE;
1767 }
1768
1769 static int connection_bind_cb( Operation *op, SlapReply *rs )
1770 {
1771         ldap_pvt_thread_mutex_lock( &op->o_conn->c_mutex );
1772         if ( op->o_conn->c_conn_state == SLAP_C_BINDING )
1773                 op->o_conn->c_conn_state = SLAP_C_ACTIVE;
1774         op->o_conn->c_sasl_bind_in_progress =
1775                 ( rs->sr_err == LDAP_SASL_BIND_IN_PROGRESS );
1776
1777         /* Moved here from bind.c due to ITS#4158 */
1778         op->o_conn->c_sasl_bindop = NULL;
1779         if ( op->orb_method == LDAP_AUTH_SASL ) {
1780                 if( rs->sr_err == LDAP_SUCCESS ) {
1781                         ber_dupbv(&op->o_conn->c_dn, &op->orb_edn);
1782                         if( !BER_BVISEMPTY( &op->orb_edn ) ) {
1783                                 /* edn is always normalized already */
1784                                 ber_dupbv( &op->o_conn->c_ndn, &op->o_conn->c_dn );
1785                         }
1786                         op->o_tmpfree( op->orb_edn.bv_val, op->o_tmpmemctx );
1787                         BER_BVZERO( &op->orb_edn );
1788                         op->o_conn->c_authmech = op->o_conn->c_sasl_bind_mech;
1789                         BER_BVZERO( &op->o_conn->c_sasl_bind_mech );
1790
1791                         op->o_conn->c_sasl_ssf = op->orb_ssf;
1792                         if( op->orb_ssf > op->o_conn->c_ssf ) {
1793                                 op->o_conn->c_ssf = op->orb_ssf;
1794                         }
1795
1796                         if( !BER_BVISEMPTY( &op->o_conn->c_dn ) ) {
1797                                 ber_len_t max = sockbuf_max_incoming_auth;
1798                                 ber_sockbuf_ctrl( op->o_conn->c_sb,
1799                                         LBER_SB_OPT_SET_MAX_INCOMING, &max );
1800                         }
1801
1802                         /* log authorization identity */
1803                         Statslog( LDAP_DEBUG_STATS,
1804                                 "%s BIND dn=\"%s\" mech=%s ssf=%d\n",
1805                                 op->o_log_prefix,
1806                                 BER_BVISNULL( &op->o_conn->c_dn ) ? "<empty>" : op->o_conn->c_dn.bv_val,
1807                                 op->o_conn->c_authmech.bv_val, op->orb_ssf, 0 );
1808
1809                         Debug( LDAP_DEBUG_TRACE,
1810                                 "do_bind: SASL/%s bind: dn=\"%s\" ssf=%d\n",
1811                                 op->o_conn->c_authmech.bv_val,
1812                                 BER_BVISNULL( &op->o_conn->c_dn ) ? "<empty>" : op->o_conn->c_dn.bv_val,
1813                                 op->orb_ssf );
1814
1815                 } else if ( rs->sr_err != LDAP_SASL_BIND_IN_PROGRESS ) {
1816                         if ( !BER_BVISNULL( &op->o_conn->c_sasl_bind_mech ) ) {
1817                                 free( op->o_conn->c_sasl_bind_mech.bv_val );
1818                                 BER_BVZERO( &op->o_conn->c_sasl_bind_mech );
1819                         }
1820                 }
1821         }
1822         ldap_pvt_thread_mutex_unlock( &op->o_conn->c_mutex );
1823
1824         ch_free( op->o_callback );
1825         op->o_callback = NULL;
1826
1827         return SLAP_CB_CONTINUE;
1828 }
1829
1830 static void connection_op_queue( Operation *op )
1831 {
1832         ber_tag_t tag = op->o_tag;
1833
1834         if (tag == LDAP_REQ_BIND) {
1835                 slap_callback *sc = ch_calloc( 1, sizeof( slap_callback ));
1836                 sc->sc_response = connection_bind_cb;
1837                 sc->sc_cleanup = connection_bind_cleanup_cb;
1838                 sc->sc_next = op->o_callback;
1839                 op->o_callback = sc;
1840                 op->o_conn->c_conn_state = SLAP_C_BINDING;
1841         }
1842
1843         if (!op->o_dn.bv_len) {
1844                 op->o_authz = op->o_conn->c_authz;
1845                 if ( BER_BVISNULL( &op->o_conn->c_sasl_authz_dn )) {
1846                         ber_dupbv( &op->o_dn, &op->o_conn->c_dn );
1847                         ber_dupbv( &op->o_ndn, &op->o_conn->c_ndn );
1848                 } else {
1849                         ber_dupbv( &op->o_dn, &op->o_conn->c_sasl_authz_dn );
1850                         ber_dupbv( &op->o_ndn, &op->o_conn->c_sasl_authz_dn );
1851                 }
1852         }
1853
1854         op->o_authtype = op->o_conn->c_authtype;
1855         ber_dupbv( &op->o_authmech, &op->o_conn->c_authmech );
1856
1857         if (!op->o_protocol) {
1858                 op->o_protocol = op->o_conn->c_protocol
1859                         ? op->o_conn->c_protocol : LDAP_VERSION3;
1860         }
1861
1862         if (op->o_conn->c_conn_state == SLAP_C_INACTIVE &&
1863                 op->o_protocol > LDAP_VERSION2)
1864         {
1865                 op->o_conn->c_conn_state = SLAP_C_ACTIVE;
1866         }
1867
1868         op->o_connid = op->o_conn->c_connid;
1869         connection_init_log_prefix( op );
1870
1871         LDAP_STAILQ_INSERT_TAIL( &op->o_conn->c_ops, op, o_next );
1872 }
1873
1874 static int connection_op_activate( Operation *op )
1875 {
1876         int rc;
1877
1878         connection_op_queue( op );
1879
1880         rc = ldap_pvt_thread_pool_submit( &connection_pool,
1881                 connection_operation, (void *) op );
1882
1883         if ( rc != 0 ) {
1884                 Debug( LDAP_DEBUG_ANY,
1885                         "connection_op_activate: submit failed (%d) for conn=%lu\n",
1886                         rc, op->o_connid, 0 );
1887                 /* should move op to pending list */
1888         }
1889
1890         return rc;
1891 }
1892
1893 int connection_write(ber_socket_t s)
1894 {
1895         Connection *c;
1896         Operation *op;
1897
1898         assert( connections != NULL );
1899
1900         slapd_clr_write( s, 0 );
1901
1902         c = connection_get( s );
1903         if( c == NULL ) {
1904                 Debug( LDAP_DEBUG_ANY,
1905                         "connection_write(%ld): no connection!\n",
1906                         (long)s, 0, 0 );
1907                 return -1;
1908         }
1909
1910         c->c_n_write++;
1911
1912         Debug( LDAP_DEBUG_TRACE,
1913                 "connection_write(%d): waking output for id=%lu\n",
1914                 s, c->c_connid, 0 );
1915         ldap_pvt_thread_cond_signal( &c->c_write_cv );
1916
1917         if ( ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_NEEDS_READ, NULL ) ) {
1918                 slapd_set_read( s, 1 );
1919         }
1920         if ( ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_NEEDS_WRITE, NULL ) ) {
1921                 slapd_set_write( s, 1 );
1922         }
1923
1924         /* If there are ops pending because of a writewaiter,
1925          * start one up.
1926          */
1927         while ((op = LDAP_STAILQ_FIRST( &c->c_pending_ops )) != NULL) {
1928                 if ( !c->c_writewaiter ) break;
1929                 if ( c->c_n_ops_executing > connection_pool_max/2 ) break;
1930
1931                 LDAP_STAILQ_REMOVE_HEAD( &c->c_pending_ops, o_next );
1932                 LDAP_STAILQ_NEXT(op, o_next) = NULL;
1933
1934                 /* pending operations should not be marked for abandonment */
1935                 assert(!op->o_abandon);
1936
1937                 c->c_n_ops_pending--;
1938                 c->c_n_ops_executing++;
1939
1940                 connection_op_activate( op );
1941
1942                 break;
1943         }
1944
1945         connection_return( c );
1946         return 0;
1947 }
1948
1949 #ifdef LDAP_SLAPI
1950 typedef struct conn_fake_extblock {
1951         void *eb_conn;
1952         void *eb_op;
1953 } conn_fake_extblock;
1954
1955 static void
1956 connection_fake_destroy(
1957         void *key,
1958         void *data )
1959 {
1960         Connection conn = {0};
1961         Operation op = {0};
1962         Opheader ohdr = {0};
1963
1964         conn_fake_extblock *eb = data;
1965
1966         op.o_hdr = &ohdr;
1967         op.o_hdr->oh_extensions = eb->eb_op;
1968         conn.c_extensions = eb->eb_conn;
1969         op.o_conn = &conn;
1970         conn.c_connid = -1;
1971         op.o_connid = -1;
1972
1973         ber_memfree_x( eb, NULL );
1974         slapi_int_free_object_extensions( SLAPI_X_EXT_OPERATION, &op );
1975         slapi_int_free_object_extensions( SLAPI_X_EXT_CONNECTION, &conn );
1976 }
1977 #endif
1978
1979 void
1980 connection_fake_init(
1981         Connection *conn,
1982         Operation *op,
1983         void *ctx )
1984 {
1985         conn->c_connid = -1;
1986         conn->c_send_ldap_result = slap_send_ldap_result;
1987         conn->c_send_search_entry = slap_send_search_entry;
1988         conn->c_send_search_reference = slap_send_search_reference;
1989         conn->c_listener = (Listener *)&dummy_list;
1990         conn->c_peer_domain = slap_empty_bv;
1991         conn->c_peer_name = slap_empty_bv;
1992
1993         memset(op, 0, OPERATION_BUFFER_SIZE);
1994         op->o_hdr = (Opheader *)(op+1);
1995         op->o_controls = (void **)(op->o_hdr+1);
1996         /* set memory context */
1997         op->o_tmpmemctx = slap_sl_mem_create(SLAP_SLAB_SIZE, SLAP_SLAB_STACK, ctx);
1998         op->o_tmpmfuncs = &slap_sl_mfuncs;
1999         op->o_threadctx = ctx;
2000         op->o_tid = ldap_pvt_thread_pool_tid( ctx );
2001
2002         op->o_conn = conn;
2003         op->o_connid = op->o_conn->c_connid;
2004         connection_init_log_prefix( op );
2005
2006 #ifdef LDAP_SLAPI
2007         if ( slapi_plugins_used ) {
2008                 conn_fake_extblock *eb = NULL;
2009
2010                 /* Use thread keys to make sure these eventually get cleaned up */
2011                 if ( ldap_pvt_thread_pool_getkey( ctx, connection_fake_init, &eb,
2012                         NULL )) {
2013                         eb = ch_malloc( sizeof( *eb ));
2014                         slapi_int_create_object_extensions( SLAPI_X_EXT_CONNECTION, conn );
2015                         slapi_int_create_object_extensions( SLAPI_X_EXT_OPERATION, op );
2016                         eb->eb_conn = conn->c_extensions;
2017                         eb->eb_op = op->o_hdr->oh_extensions;
2018                         ldap_pvt_thread_pool_setkey( ctx, connection_fake_init, eb,
2019                                 connection_fake_destroy );
2020                 } else {
2021                         conn->c_extensions = eb->eb_conn;
2022                         op->o_hdr->oh_extensions = eb->eb_op;
2023                 }
2024         }
2025 #endif /* LDAP_SLAPI */
2026
2027         slap_op_time( &op->o_time, &op->o_tincr );
2028 }
2029
2030 void
2031 connection_assign_nextid( Connection *conn )
2032 {
2033         ldap_pvt_thread_mutex_lock( &conn_nextid_mutex );
2034         conn->c_connid = conn_nextid++;
2035         ldap_pvt_thread_mutex_unlock( &conn_nextid_mutex );
2036 }