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 1998-2008 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 typedef struct conn_readinfo {
  87         Operation *op;
  88         ldap_pvt_thread_start_t *func;
  89         void *arg;
  90         void *ctx;
  91         int nullop;
  92 } conn_readinfo;
  93
  94 static int connection_input( Connection *c, conn_readinfo *cri );
  95 static void connection_close( Connection *c );
  96
  97 static int connection_op_activate( Operation *op );
  98 static void connection_op_queue( Operation *op );
  99 static int connection_resched( Connection *conn );
 100 static void connection_abandon( Connection *conn );
 101 static void connection_destroy( Connection *c );
 102
 103 static ldap_pvt_thread_start_t connection_operation;
 104
 105 /*
 106  * Initialize connection management infrastructure.
 107  */
 108 int connections_init(void)
 109 {
 110         int i;
 111
 112         assert( connections == NULL );
 113
 114         if( connections != NULL) {
 115                 Debug( LDAP_DEBUG_ANY, "connections_init: already initialized.\n",
 116                         0, 0, 0 );
 117                 return -1;
 118         }
 119
 120         /* should check return of every call */
 121         ldap_pvt_thread_mutex_init( &connections_mutex );
 122         ldap_pvt_thread_mutex_init( &conn_nextid_mutex );
 123
 124         connections = (Connection *) ch_calloc( dtblsize, sizeof(Connection) );
 125
 126         if( connections == NULL ) {
 127                 Debug( LDAP_DEBUG_ANY, "connections_init: "
 128                         "allocation (%d*%ld) of connection array failed\n",
 129                         dtblsize, (long) sizeof(Connection), 0 );
 130                 return -1;
 131         }
 132
 133         assert( connections[0].c_struct_state == SLAP_C_UNINITIALIZED );
 134         assert( connections[dtblsize-1].c_struct_state == SLAP_C_UNINITIALIZED );
 135
 136         for (i=0; i<dtblsize; i++) connections[i].c_conn_idx = i;
 137
 138         /*
 139          * per entry initialization of the Connection array initialization
 140          * will be done by connection_init()
 141          */
 142
 143         return 0;
 144 }
 145
 146 /*
 147  * Destroy connection management infrastructure.
 148  */
 149
 150 int connections_destroy(void)
 151 {
 152         ber_socket_t i;
 153
 154         /* should check return of every call */
 155
 156         if( connections == NULL) {
 157                 Debug( LDAP_DEBUG_ANY, "connections_destroy: nothing to destroy.\n",
 158                         0, 0, 0 );
 159                 return -1;
 160         }
 161
 162         for ( i = 0; i < dtblsize; i++ ) {
 163                 if( connections[i].c_struct_state != SLAP_C_UNINITIALIZED ) {
 164                         ber_sockbuf_free( connections[i].c_sb );
 165                         ldap_pvt_thread_mutex_destroy( &connections[i].c_mutex );
 166                         ldap_pvt_thread_mutex_destroy( &connections[i].c_write_mutex );
 167                         ldap_pvt_thread_cond_destroy( &connections[i].c_write_cv );
 168 #ifdef LDAP_SLAPI
 169                         if ( slapi_plugins_used ) {
 170                                 slapi_int_free_object_extensions( SLAPI_X_EXT_CONNECTION,
 171                                         &connections[i] );
 172                         }
 173 #endif
 174                 }
 175         }
 176
 177         free( connections );
 178         connections = NULL;
 179
 180         ldap_pvt_thread_mutex_destroy( &connections_mutex );
 181         ldap_pvt_thread_mutex_destroy( &conn_nextid_mutex );
 182         return 0;
 183 }
 184
 185 /*
 186  * shutdown all connections
 187  */
 188 int connections_shutdown(void)
 189 {
 190         ber_socket_t i;
 191
 192         for ( i = 0; i < dtblsize; i++ ) {
 193                 if( connections[i].c_struct_state != SLAP_C_UNINITIALIZED ) {
 194                         ldap_pvt_thread_mutex_lock( &connections[i].c_mutex );
 195                         if( connections[i].c_struct_state == SLAP_C_USED ) {
 196
 197                                 /* give persistent clients a chance to cleanup */
 198                                 if( connections[i].c_conn_state == SLAP_C_CLIENT ) {
 199                                         ldap_pvt_thread_pool_submit( &connection_pool,
 200                                         connections[i].c_clientfunc, connections[i].c_clientarg );
 201                                 } else {
 202                                         /* c_mutex is locked */
 203                                         connection_closing( &connections[i], "slapd shutdown" );
 204                                         connection_close( &connections[i] );
 205                                 }
 206                         }
 207                         ldap_pvt_thread_mutex_unlock( &connections[i].c_mutex );
 208                 }
 209         }
 210
 211         return 0;
 212 }
 213
 214 /*
 215  * Timeout idle connections.
 216  */
 217 int connections_timeout_idle(time_t now)
 218 {
 219         int i = 0;
 220         int connindex;
 221         Connection* c;
 222
 223         for( c = connection_first( &connindex );
 224                 c != NULL;
 225                 c = connection_next( c, &connindex ) )
 226         {
 227                 /* Don't timeout a slow-running request or a persistent
 228                  * outbound connection */
 229                 if( c->c_n_ops_executing || c->c_conn_state == SLAP_C_CLIENT ) {
 230                         continue;
 231                 }
 232
 233                 if( difftime( c->c_activitytime+global_idletimeout, now) < 0 ) {
 234                         /* close it */
 235                         connection_closing( c, "idletimeout" );
 236                         connection_close( c );
 237                         i++;
 238                 }
 239         }
 240         connection_done( c );
 241
 242         return i;
 243 }
 244
 245 static Connection* connection_get( ber_socket_t s )
 246 {
 247         Connection *c;
 248
 249         Debug( LDAP_DEBUG_ARGS,
 250                 "connection_get(%ld)\n",
 251                 (long) s, 0, 0 );
 252
 253         assert( connections != NULL );
 254
 255         if(s == AC_SOCKET_INVALID) return NULL;
 256
 257         assert( s < dtblsize );
 258         c = &connections[s];
 259
 260         if( c != NULL ) {
 261                 ldap_pvt_thread_mutex_lock( &c->c_mutex );
 262
 263                 assert( c->c_struct_state != SLAP_C_UNINITIALIZED );
 264
 265                 if( c->c_struct_state != SLAP_C_USED ) {
 266                         /* connection must have been closed due to resched */
 267
 268                         assert( c->c_conn_state == SLAP_C_INVALID );
 269                         assert( c->c_sd == AC_SOCKET_INVALID );
 270
 271                         Debug( LDAP_DEBUG_TRACE,
 272                                 "connection_get(%d): connection not used\n",
 273                                 s, 0, 0 );
 274
 275                         ldap_pvt_thread_mutex_unlock( &c->c_mutex );
 276                         return NULL;
 277                 }
 278
 279                 Debug( LDAP_DEBUG_TRACE,
 280                         "connection_get(%d): got connid=%lu\n",
 281                         s, c->c_connid, 0 );
 282
 283                 c->c_n_get++;
 284
 285                 assert( c->c_struct_state == SLAP_C_USED );
 286                 assert( c->c_conn_state != SLAP_C_INVALID );
 287                 assert( c->c_sd != AC_SOCKET_INVALID );
 288
 289 #ifndef SLAPD_MONITOR
 290                 if ( global_idletimeout > 0 )
 291 #endif /* ! SLAPD_MONITOR */
 292                 {
 293                         c->c_activitytime = slap_get_time();
 294                 }
 295         }
 296
 297         return c;
 298 }
 299
 300 static void connection_return( Connection *c )
 301 {
 302         ldap_pvt_thread_mutex_unlock( &c->c_mutex );
 303 }
 304
 305 Connection * connection_init(
 306         ber_socket_t s,
 307         Listener *listener,
 308         const char* dnsname,
 309         const char* peername,
 310         int flags,
 311         slap_ssf_t ssf,
 312         struct berval *authid
 313         LDAP_PF_LOCAL_SENDMSG_ARG(struct berval *peerbv))
 314 {
 315         unsigned long id;
 316         Connection *c;
 317         int doinit = 0;
 318         ber_socket_t sfd = SLAP_FD2SOCK(s);
 319
 320         assert( connections != NULL );
 321
 322         assert( listener != NULL );
 323         assert( dnsname != NULL );
 324         assert( peername != NULL );
 325
 326 #ifndef HAVE_TLS
 327         assert( !( flags & CONN_IS_TLS ));
 328 #endif
 329
 330         if( s == AC_SOCKET_INVALID ) {
 331                 Debug( LDAP_DEBUG_ANY,
 332                         "connection_init: init of socket %ld invalid.\n", (long)s, 0, 0 );
 333                 return NULL;
 334         }
 335
 336         assert( s >= 0 );
 337         assert( s < dtblsize );
 338         c = &connections[s];
 339         if( c->c_struct_state == SLAP_C_UNINITIALIZED ) {
 340                 doinit = 1;
 341         } else {
 342                 assert( c->c_struct_state == SLAP_C_UNUSED );
 343         }
 344
 345         if( doinit ) {
 346                 c->c_send_ldap_result = slap_send_ldap_result;
 347                 c->c_send_search_entry = slap_send_search_entry;
 348                 c->c_send_search_reference = slap_send_search_reference;
 349                 c->c_send_ldap_extended = slap_send_ldap_extended;
 350                 c->c_send_ldap_intermediate = slap_send_ldap_intermediate;
 351
 352                 BER_BVZERO( &c->c_authmech );
 353                 BER_BVZERO( &c->c_dn );
 354                 BER_BVZERO( &c->c_ndn );
 355
 356                 c->c_listener = NULL;
 357                 BER_BVZERO( &c->c_peer_domain );
 358                 BER_BVZERO( &c->c_peer_name );
 359
 360                 LDAP_STAILQ_INIT(&c->c_ops);
 361                 LDAP_STAILQ_INIT(&c->c_pending_ops);
 362
 363 #ifdef LDAP_X_TXN
 364                 c->c_txn = CONN_TXN_INACTIVE;
 365                 c->c_txn_backend = NULL;
 366                 LDAP_STAILQ_INIT(&c->c_txn_ops);
 367 #endif
 368
 369                 BER_BVZERO( &c->c_sasl_bind_mech );
 370                 c->c_sasl_done = 0;
 371                 c->c_sasl_authctx = NULL;
 372                 c->c_sasl_sockctx = NULL;
 373                 c->c_sasl_extra = NULL;
 374                 c->c_sasl_bindop = NULL;
 375
 376                 c->c_sb = ber_sockbuf_alloc( );
 377
 378                 {
 379                         ber_len_t max = sockbuf_max_incoming;
 380                         ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_SET_MAX_INCOMING, &max );
 381                 }
 382
 383                 c->c_currentber = NULL;
 384
 385                 /* should check status of thread calls */
 386                 ldap_pvt_thread_mutex_init( &c->c_mutex );
 387                 ldap_pvt_thread_mutex_init( &c->c_write_mutex );
 388                 ldap_pvt_thread_cond_init( &c->c_write_cv );
 389
 390 #ifdef LDAP_SLAPI
 391                 if ( slapi_plugins_used ) {
 392                         slapi_int_create_object_extensions( SLAPI_X_EXT_CONNECTION, c );
 393                 }
 394 #endif
 395         }
 396
 397         ldap_pvt_thread_mutex_lock( &c->c_mutex );
 398
 399         assert( BER_BVISNULL( &c->c_authmech ) );
 400         assert( BER_BVISNULL( &c->c_dn ) );
 401         assert( BER_BVISNULL( &c->c_ndn ) );
 402         assert( c->c_listener == NULL );
 403         assert( BER_BVISNULL( &c->c_peer_domain ) );
 404         assert( BER_BVISNULL( &c->c_peer_name ) );
 405         assert( LDAP_STAILQ_EMPTY(&c->c_ops) );
 406         assert( LDAP_STAILQ_EMPTY(&c->c_pending_ops) );
 407 #ifdef LDAP_X_TXN
 408         assert( c->c_txn == CONN_TXN_INACTIVE );
 409         assert( c->c_txn_backend == NULL );
 410         assert( LDAP_STAILQ_EMPTY(&c->c_txn_ops) );
 411 #endif
 412         assert( BER_BVISNULL( &c->c_sasl_bind_mech ) );
 413         assert( c->c_sasl_done == 0 );
 414         assert( c->c_sasl_authctx == NULL );
 415         assert( c->c_sasl_sockctx == NULL );
 416         assert( c->c_sasl_extra == NULL );
 417         assert( c->c_sasl_bindop == NULL );
 418         assert( c->c_currentber == NULL );
 419         assert( c->c_writewaiter == 0);
 420
 421         c->c_listener = listener;
 422         c->c_sd = s;
 423
 424         if ( flags & CONN_IS_CLIENT ) {
 425                 c->c_connid = 0;
 426                 ldap_pvt_thread_mutex_lock( &connections_mutex );
 427                 c->c_conn_state = SLAP_C_CLIENT;
 428                 c->c_struct_state = SLAP_C_USED;
 429                 ldap_pvt_thread_mutex_unlock( &connections_mutex );
 430                 c->c_close_reason = "?";                        /* should never be needed */
 431                 ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_SET_FD, &sfd );
 432                 ldap_pvt_thread_mutex_unlock( &c->c_mutex );
 433
 434                 return c;
 435         }
 436
 437         ber_str2bv( dnsname, 0, 1, &c->c_peer_domain );
 438         ber_str2bv( peername, 0, 1, &c->c_peer_name );
 439
 440         c->c_n_ops_received = 0;
 441         c->c_n_ops_executing = 0;
 442         c->c_n_ops_pending = 0;
 443         c->c_n_ops_completed = 0;
 444
 445         c->c_n_get = 0;
 446         c->c_n_read = 0;
 447         c->c_n_write = 0;
 448
 449         /* set to zero until bind, implies LDAP_VERSION3 */
 450         c->c_protocol = 0;
 451
 452 #ifndef SLAPD_MONITOR
 453         if ( global_idletimeout > 0 )
 454 #endif /* ! SLAPD_MONITOR */
 455         {
 456                 c->c_activitytime = c->c_starttime = slap_get_time();
 457         }
 458
 459 #ifdef LDAP_CONNECTIONLESS
 460         c->c_is_udp = 0;
 461         if( flags & CONN_IS_UDP ) {
 462                 c->c_is_udp = 1;
 463 #ifdef LDAP_DEBUG
 464                 ber_sockbuf_add_io( c->c_sb, &ber_sockbuf_io_debug,
 465                         LBER_SBIOD_LEVEL_PROVIDER, (void*)"udp_" );
 466 #endif
 467                 ber_sockbuf_add_io( c->c_sb, &ber_sockbuf_io_udp,
 468                         LBER_SBIOD_LEVEL_PROVIDER, (void *)&sfd );
 469                 ber_sockbuf_add_io( c->c_sb, &ber_sockbuf_io_readahead,
 470                         LBER_SBIOD_LEVEL_PROVIDER, NULL );
 471         } else
 472 #endif /* LDAP_CONNECTIONLESS */
 473 #ifdef LDAP_PF_LOCAL
 474         if ( flags & CONN_IS_IPC ) {
 475 #ifdef LDAP_DEBUG
 476                 ber_sockbuf_add_io( c->c_sb, &ber_sockbuf_io_debug,
 477                         LBER_SBIOD_LEVEL_PROVIDER, (void*)"ipc_" );
 478 #endif
 479                 ber_sockbuf_add_io( c->c_sb, &ber_sockbuf_io_fd,
 480                         LBER_SBIOD_LEVEL_PROVIDER, (void *)&sfd );
 481 #ifdef LDAP_PF_LOCAL_SENDMSG
 482                 if ( !BER_BVISEMPTY( peerbv ))
 483                         ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_UNGET_BUF, peerbv );
 484 #endif
 485         } else
 486 #endif /* LDAP_PF_LOCAL */
 487         {
 488 #ifdef LDAP_DEBUG
 489                 ber_sockbuf_add_io( c->c_sb, &ber_sockbuf_io_debug,
 490                         LBER_SBIOD_LEVEL_PROVIDER, (void*)"tcp_" );
 491 #endif
 492                 ber_sockbuf_add_io( c->c_sb, &ber_sockbuf_io_tcp,
 493                         LBER_SBIOD_LEVEL_PROVIDER, (void *)&sfd );
 494         }
 495
 496 #ifdef LDAP_DEBUG
 497         ber_sockbuf_add_io( c->c_sb, &ber_sockbuf_io_debug,
 498                 INT_MAX, (void*)"ldap_" );
 499 #endif
 500
 501         if( ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_SET_NONBLOCK,
 502                 c /* non-NULL */ ) < 0 )
 503         {
 504                 Debug( LDAP_DEBUG_ANY,
 505                         "connection_init(%d, %s): set nonblocking failed\n",
 506                         s, c->c_peer_name.bv_val, 0 );
 507         }
 508
 509         ldap_pvt_thread_mutex_lock( &conn_nextid_mutex );
 510         id = c->c_connid = conn_nextid++;
 511         ldap_pvt_thread_mutex_unlock( &conn_nextid_mutex );
 512
 513         ldap_pvt_thread_mutex_lock( &connections_mutex );
 514         c->c_conn_state = SLAP_C_INACTIVE;
 515         c->c_struct_state = SLAP_C_USED;
 516         ldap_pvt_thread_mutex_unlock( &connections_mutex );
 517         c->c_close_reason = "?";                        /* should never be needed */
 518
 519         c->c_ssf = c->c_transport_ssf = ssf;
 520         c->c_tls_ssf = 0;
 521
 522 #ifdef HAVE_TLS
 523         if ( flags & CONN_IS_TLS ) {
 524                 c->c_is_tls = 1;
 525                 c->c_needs_tls_accept = 1;
 526         } else {
 527                 c->c_is_tls = 0;
 528                 c->c_needs_tls_accept = 0;
 529         }
 530 #endif
 531
 532         slap_sasl_open( c, 0 );
 533         slap_sasl_external( c, ssf, authid );
 534
 535         slapd_add_internal( s, 1 );
 536         ldap_pvt_thread_mutex_unlock( &c->c_mutex );
 537
 538         backend_connection_init(c);
 539
 540         return c;
 541 }
 542
 543 void connection2anonymous( Connection *c )
 544 {
 545         assert( connections != NULL );
 546         assert( c != NULL );
 547
 548         {
 549                 ber_len_t max = sockbuf_max_incoming;
 550                 ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_SET_MAX_INCOMING, &max );
 551         }
 552
 553         if ( !BER_BVISNULL( &c->c_authmech ) ) {
 554                 ch_free(c->c_authmech.bv_val);
 555         }
 556         BER_BVZERO( &c->c_authmech );
 557
 558         if ( !BER_BVISNULL( &c->c_dn ) ) {
 559                 ch_free(c->c_dn.bv_val);
 560         }
 561         BER_BVZERO( &c->c_dn );
 562
 563         if ( !BER_BVISNULL( &c->c_ndn ) ) {
 564                 ch_free(c->c_ndn.bv_val);
 565         }
 566         BER_BVZERO( &c->c_ndn );
 567
 568         if ( !BER_BVISNULL( &c->c_sasl_authz_dn ) ) {
 569                 ber_memfree_x( c->c_sasl_authz_dn.bv_val, NULL );
 570         }
 571         BER_BVZERO( &c->c_sasl_authz_dn );
 572
 573         c->c_authz_backend = NULL;
 574 }
 575
 576 static void
 577 connection_destroy( Connection *c )
 578 {
 579         unsigned long   connid;
 580         const char              *close_reason;
 581         Sockbuf                 *sb;
 582         ber_socket_t    sd;
 583
 584         assert( connections != NULL );
 585         assert( c != NULL );
 586         assert( c->c_struct_state != SLAP_C_UNUSED );
 587         assert( c->c_conn_state != SLAP_C_INVALID );
 588         assert( LDAP_STAILQ_EMPTY(&c->c_ops) );
 589         assert( LDAP_STAILQ_EMPTY(&c->c_pending_ops) );
 590 #ifdef LDAP_X_TXN
 591         assert( c->c_txn == CONN_TXN_INACTIVE );
 592         assert( c->c_txn_backend == NULL );
 593         assert( LDAP_STAILQ_EMPTY(&c->c_txn_ops) );
 594 #endif
 595         assert( c->c_writewaiter == 0);
 596
 597         /* only for stats (print -1 as "%lu" may give unexpected results ;) */
 598         connid = c->c_connid;
 599         close_reason = c->c_close_reason;
 600
 601         ldap_pvt_thread_mutex_lock( &connections_mutex );
 602         c->c_struct_state = SLAP_C_PENDING;
 603         ldap_pvt_thread_mutex_unlock( &connections_mutex );
 604
 605         backend_connection_destroy(c);
 606
 607         c->c_protocol = 0;
 608         c->c_connid = -1;
 609
 610         c->c_activitytime = c->c_starttime = 0;
 611
 612         connection2anonymous( c );
 613         c->c_listener = NULL;
 614
 615         if(c->c_peer_domain.bv_val != NULL) {
 616                 free(c->c_peer_domain.bv_val);
 617         }
 618         BER_BVZERO( &c->c_peer_domain );
 619         if(c->c_peer_name.bv_val != NULL) {
 620                 free(c->c_peer_name.bv_val);
 621         }
 622         BER_BVZERO( &c->c_peer_name );
 623
 624         c->c_sasl_bind_in_progress = 0;
 625         if(c->c_sasl_bind_mech.bv_val != NULL) {
 626                 free(c->c_sasl_bind_mech.bv_val);
 627         }
 628         BER_BVZERO( &c->c_sasl_bind_mech );
 629
 630         slap_sasl_close( c );
 631
 632         if ( c->c_currentber != NULL ) {
 633                 ber_free( c->c_currentber, 1 );
 634                 c->c_currentber = NULL;
 635         }
 636
 637
 638 #ifdef LDAP_SLAPI
 639         /* call destructors, then constructors; avoids unnecessary allocation */
 640         if ( slapi_plugins_used ) {
 641                 slapi_int_clear_object_extensions( SLAPI_X_EXT_CONNECTION, c );
 642         }
 643 #endif
 644
 645         sd = c->c_sd;
 646         c->c_sd = AC_SOCKET_INVALID;
 647         c->c_conn_state = SLAP_C_INVALID;
 648         c->c_struct_state = SLAP_C_UNUSED;
 649         c->c_close_reason = "?";                        /* should never be needed */
 650
 651         sb = c->c_sb;
 652         c->c_sb = ber_sockbuf_alloc( );
 653         {
 654                 ber_len_t max = sockbuf_max_incoming;
 655                 ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_SET_MAX_INCOMING, &max );
 656         }
 657
 658         /* c must be fully reset by this point; when we call slapd_remove
 659          * it may get immediately reused by a new connection.
 660          */
 661         if ( sd != AC_SOCKET_INVALID ) {
 662                 slapd_remove( sd, sb, 1, 0, 0 );
 663
 664                 if ( close_reason == NULL ) {
 665                         Statslog( LDAP_DEBUG_STATS, "conn=%lu fd=%ld closed\n",
 666                                 connid, (long) sd, 0, 0, 0 );
 667                 } else {
 668                         Statslog( LDAP_DEBUG_STATS, "conn=%lu fd=%ld closed (%s)\n",
 669                                 connid, (long) sd, close_reason, 0, 0 );
 670                 }
 671         }
 672 }
 673
 674 int connection_state_closing( Connection *c )
 675 {
 676         /* c_mutex must be locked by caller */
 677
 678         int state;
 679         assert( c != NULL );
 680         assert( c->c_struct_state == SLAP_C_USED );
 681
 682         state = c->c_conn_state;
 683
 684         assert( state != SLAP_C_INVALID );
 685
 686         return state == SLAP_C_CLOSING;
 687 }
 688
 689 static void connection_abandon( Connection *c )
 690 {
 691         /* c_mutex must be locked by caller */
 692
 693         Operation *o, *next, op = {0};
 694         Opheader ohdr = {0};
 695         SlapReply rs = {0};
 696
 697         op.o_hdr = &ohdr;
 698         op.o_conn = c;
 699         op.o_connid = c->c_connid;
 700         op.o_tag = LDAP_REQ_ABANDON;
 701
 702         for ( o = LDAP_STAILQ_FIRST( &c->c_ops ); o; o=next ) {
 703                 next = LDAP_STAILQ_NEXT( o, o_next );
 704                 op.orn_msgid = o->o_msgid;
 705                 o->o_abandon = 1;
 706                 op.o_bd = frontendDB;
 707                 frontendDB->be_abandon( &op, &rs );
 708         }
 709
 710 #ifdef LDAP_X_TXN
 711         /* remove operations in pending transaction */
 712         while ( (o = LDAP_STAILQ_FIRST( &c->c_txn_ops )) != NULL) {
 713                 LDAP_STAILQ_REMOVE_HEAD( &c->c_txn_ops, o_next );
 714                 LDAP_STAILQ_NEXT(o, o_next) = NULL;
 715                 slap_op_free( o, NULL );
 716         }
 717
 718         /* clear transaction */
 719         c->c_txn_backend = NULL;
 720         c->c_txn = CONN_TXN_INACTIVE;
 721 #endif
 722
 723         /* remove pending operations */
 724         while ( (o = LDAP_STAILQ_FIRST( &c->c_pending_ops )) != NULL) {
 725                 LDAP_STAILQ_REMOVE_HEAD( &c->c_pending_ops, o_next );
 726                 LDAP_STAILQ_NEXT(o, o_next) = NULL;
 727                 slap_op_free( o, NULL );
 728         }
 729 }
 730
 731 void connection_closing( Connection *c, const char *why )
 732 {
 733         assert( connections != NULL );
 734         assert( c != NULL );
 735         assert( c->c_struct_state == SLAP_C_USED );
 736         assert( c->c_conn_state != SLAP_C_INVALID );
 737
 738         /* c_mutex must be locked by caller */
 739
 740         if( c->c_conn_state != SLAP_C_CLOSING ) {
 741                 Debug( LDAP_DEBUG_TRACE,
 742                         "connection_closing: readying conn=%lu sd=%d for close\n",
 743                         c->c_connid, c->c_sd, 0 );
 744                 /* update state to closing */
 745                 c->c_conn_state = SLAP_C_CLOSING;
 746                 c->c_close_reason = why;
 747
 748                 /* don't listen on this port anymore */
 749                 slapd_clr_read( c->c_sd, 0 );
 750
 751                 /* abandon active operations */
 752                 connection_abandon( c );
 753
 754                 /* wake write blocked operations */
 755                 if ( c->c_writewaiter ) {
 756                         ldap_pvt_thread_cond_signal( &c->c_write_cv );
 757                         /* ITS#4667 this may allow another thread to drop into
 758                          * connection_resched / connection_close before we
 759                          * finish, but that's OK.
 760                          */
 761                         slapd_clr_write( c->c_sd, 1 );
 762                         ldap_pvt_thread_mutex_unlock( &c->c_mutex );
 763                         ldap_pvt_thread_mutex_lock( &c->c_write_mutex );
 764                         ldap_pvt_thread_mutex_lock( &c->c_mutex );
 765                         ldap_pvt_thread_mutex_unlock( &c->c_write_mutex );
 766                 } else {
 767                         slapd_clr_write( c->c_sd, 1 );
 768                 }
 769
 770         } else if( why == NULL && c->c_close_reason == conn_lost_str ) {
 771                 /* Client closed connection after doing Unbind. */
 772                 c->c_close_reason = NULL;
 773         }
 774 }
 775
 776 static void
 777 connection_close( Connection *c )
 778 {
 779         assert( connections != NULL );
 780         assert( c != NULL );
 781
 782         /* ITS#4667 we may have gotten here twice */
 783         if ( c->c_conn_state == SLAP_C_INVALID )
 784                 return;
 785
 786         assert( c->c_struct_state == SLAP_C_USED );
 787         assert( c->c_conn_state == SLAP_C_CLOSING );
 788
 789         /* NOTE: c_mutex should be locked by caller */
 790
 791         if ( !LDAP_STAILQ_EMPTY(&c->c_ops) ||
 792                 !LDAP_STAILQ_EMPTY(&c->c_pending_ops) )
 793         {
 794                 Debug( LDAP_DEBUG_TRACE,
 795                         "connection_close: deferring conn=%lu sd=%d\n",
 796                         c->c_connid, c->c_sd, 0 );
 797                 return;
 798         }
 799
 800         Debug( LDAP_DEBUG_TRACE, "connection_close: conn=%lu sd=%d\n",
 801                 c->c_connid, c->c_sd, 0 );
 802
 803         connection_destroy( c );
 804 }
 805
 806 unsigned long connections_nextid(void)
 807 {
 808         unsigned long id;
 809         assert( connections != NULL );
 810
 811         ldap_pvt_thread_mutex_lock( &conn_nextid_mutex );
 812
 813         id = conn_nextid;
 814
 815         ldap_pvt_thread_mutex_unlock( &conn_nextid_mutex );
 816
 817         return id;
 818 }
 819
 820 Connection* connection_first( ber_socket_t *index )
 821 {
 822         assert( connections != NULL );
 823         assert( index != NULL );
 824
 825         ldap_pvt_thread_mutex_lock( &connections_mutex );
 826         for( *index = 0; *index < dtblsize; (*index)++) {
 827                 if( connections[*index].c_struct_state != SLAP_C_UNINITIALIZED ) {
 828                         break;
 829                 }
 830         }
 831         ldap_pvt_thread_mutex_unlock( &connections_mutex );
 832
 833         return connection_next(NULL, index);
 834 }
 835
 836 Connection* connection_next( Connection *c, ber_socket_t *index )
 837 {
 838         assert( connections != NULL );
 839         assert( index != NULL );
 840         assert( *index <= dtblsize );
 841
 842         if( c != NULL ) ldap_pvt_thread_mutex_unlock( &c->c_mutex );
 843
 844         c = NULL;
 845
 846         ldap_pvt_thread_mutex_lock( &connections_mutex );
 847         for(; *index < dtblsize; (*index)++) {
 848                 int c_struct;
 849                 if( connections[*index].c_struct_state == SLAP_C_UNINITIALIZED ) {
 850                         /* FIXME: accessing c_conn_state without locking c_mutex */
 851                         assert( connections[*index].c_conn_state == SLAP_C_INVALID );
 852                         continue;
 853                 }
 854
 855                 if( connections[*index].c_struct_state == SLAP_C_USED ) {
 856                         c = &connections[(*index)++];
 857                         if ( ldap_pvt_thread_mutex_trylock( &c->c_mutex )) {
 858                                 /* avoid deadlock */
 859                                 ldap_pvt_thread_mutex_unlock( &connections_mutex );
 860                                 ldap_pvt_thread_mutex_lock( &c->c_mutex );
 861                                 ldap_pvt_thread_mutex_lock( &connections_mutex );
 862                                 if ( c->c_struct_state != SLAP_C_USED ) {
 863                                         ldap_pvt_thread_mutex_unlock( &c->c_mutex );
 864                                         c = NULL;
 865                                         continue;
 866                                 }
 867                         }
 868                         assert( c->c_conn_state != SLAP_C_INVALID );
 869                         break;
 870                 }
 871
 872                 c_struct = connections[*index].c_struct_state;
 873                 if ( c_struct == SLAP_C_PENDING )
 874                         continue;
 875                 assert( c_struct == SLAP_C_UNUSED );
 876                 /* FIXME: accessing c_conn_state without locking c_mutex */
 877                 assert( connections[*index].c_conn_state == SLAP_C_INVALID );
 878         }
 879
 880         ldap_pvt_thread_mutex_unlock( &connections_mutex );
 881         return c;
 882 }
 883
 884 void connection_done( Connection *c )
 885 {
 886         assert( connections != NULL );
 887
 888         if( c != NULL ) ldap_pvt_thread_mutex_unlock( &c->c_mutex );
 889 }
 890
 891 /*
 892  * connection_activity - handle the request operation op on connection
 893  * conn.  This routine figures out what kind of operation it is and
 894  * calls the appropriate stub to handle it.
 895  */
 896
 897 #ifdef SLAPD_MONITOR
 898 /* FIXME: returns 0 in case of failure */
 899 #define INCR_OP_INITIATED(index) \
 900         do { \
 901                 ldap_pvt_thread_mutex_lock( &op->o_counters->sc_mutex ); \
 902                 ldap_pvt_mp_add_ulong(op->o_counters->sc_ops_initiated_[(index)], 1); \
 903                 ldap_pvt_thread_mutex_unlock( &op->o_counters->sc_mutex ); \
 904         } while (0)
 905 #define INCR_OP_COMPLETED(index) \
 906         do { \
 907                 ldap_pvt_thread_mutex_lock( &op->o_counters->sc_mutex ); \
 908                 ldap_pvt_mp_add_ulong(op->o_counters->sc_ops_completed, 1); \
 909                 ldap_pvt_mp_add_ulong(op->o_counters->sc_ops_completed_[(index)], 1); \
 910                 ldap_pvt_thread_mutex_unlock( &op->o_counters->sc_mutex ); \
 911         } while (0)
 912 #else /* !SLAPD_MONITOR */
 913 #define INCR_OP_INITIATED(index) do { } while (0)
 914 #define INCR_OP_COMPLETED(index) \
 915         do { \
 916                 ldap_pvt_thread_mutex_lock( &op->o_counters->sc_mutex ); \
 917                 ldap_pvt_mp_add_ulong(op->o_counters->sc_ops_completed, 1); \
 918                 ldap_pvt_thread_mutex_unlock( &op->o_counters->sc_mutex ); \
 919         } while (0)
 920 #endif /* !SLAPD_MONITOR */
 921
 922 /*
 923  * NOTE: keep in sync with enum in slapd.h
 924  */
 925 static BI_op_func *opfun[] = {
 926         do_bind,
 927         do_unbind,
 928         do_search,
 929         do_compare,
 930         do_modify,
 931         do_modrdn,
 932         do_add,
 933         do_delete,
 934         do_abandon,
 935         do_extended,
 936         NULL
 937 };
 938
 939 /* Counters are per-thread, not per-connection.
 940  */
 941 static void
 942 conn_counter_destroy( void *key, void *data )
 943 {
 944         slap_counters_t **prev, *sc;
 945
 946         ldap_pvt_thread_mutex_lock( &slap_counters.sc_mutex );
 947         for ( prev = &slap_counters.sc_next, sc = slap_counters.sc_next; sc;
 948                 prev = &sc->sc_next, sc = sc->sc_next ) {
 949                 if ( sc == data ) {
 950                         int i;
 951
 952                         *prev = sc->sc_next;
 953                         /* Copy data to main counter */
 954                         ldap_pvt_mp_add( slap_counters.sc_bytes, sc->sc_bytes );
 955                         ldap_pvt_mp_add( slap_counters.sc_pdu, sc->sc_pdu );
 956                         ldap_pvt_mp_add( slap_counters.sc_entries, sc->sc_entries );
 957                         ldap_pvt_mp_add( slap_counters.sc_refs, sc->sc_refs );
 958                         ldap_pvt_mp_add( slap_counters.sc_ops_initiated, sc->sc_ops_initiated );
 959                         ldap_pvt_mp_add( slap_counters.sc_ops_completed, sc->sc_ops_completed );
 960 #ifdef SLAPD_MONITOR
 961                         for ( i = 0; i < SLAP_OP_LAST; i++ ) {
 962                                 ldap_pvt_mp_add( slap_counters.sc_ops_initiated_[ i ], sc->sc_ops_initiated_[ i ] );
 963                                 ldap_pvt_mp_add( slap_counters.sc_ops_initiated_[ i ], sc->sc_ops_completed_[ i ] );
 964                         }
 965 #endif /* SLAPD_MONITOR */
 966                         slap_counters_destroy( sc );
 967                         ber_memfree_x( data, NULL );
 968                         break;
 969                 }
 970         }
 971         ldap_pvt_thread_mutex_unlock( &slap_counters.sc_mutex );
 972 }
 973
 974 static void
 975 conn_counter_init( Operation *op, void *ctx )
 976 {
 977         slap_counters_t *sc;
 978         void *vsc = NULL;
 979
 980         if ( ldap_pvt_thread_pool_getkey(
 981                         ctx, (void *)conn_counter_init, &vsc, NULL ) || !vsc ) {
 982                 vsc = ch_malloc( sizeof( slap_counters_t ));
 983                 sc = vsc;
 984                 slap_counters_init( sc );
 985                 ldap_pvt_thread_pool_setkey( ctx, (void*)conn_counter_init, vsc,
 986                         conn_counter_destroy, NULL, NULL );
 987
 988                 ldap_pvt_thread_mutex_lock( &slap_counters.sc_mutex );
 989                 sc->sc_next = slap_counters.sc_next;
 990                 slap_counters.sc_next = sc;
 991                 ldap_pvt_thread_mutex_unlock( &slap_counters.sc_mutex );
 992         }
 993         op->o_counters = vsc;
 994 }
 995
 996 static void *
 997 connection_operation( void *ctx, void *arg_v )
 998 {
 999         int rc = LDAP_OTHER;
1000         Operation *op = arg_v;
1001         SlapReply rs = {REP_RESULT};
1002         ber_tag_t tag = op->o_tag;
1003         slap_op_t opidx = SLAP_OP_LAST;
1004         Connection *conn = op->o_conn;
1005         void *memctx = NULL;
1006         void *memctx_null = NULL;
1007         ber_len_t memsiz;
1008
1009         conn_counter_init( op, ctx );
1010         ldap_pvt_thread_mutex_lock( &op->o_counters->sc_mutex );
1011         /* FIXME: returns 0 in case of failure */
1012         ldap_pvt_mp_add_ulong(op->o_counters->sc_ops_initiated, 1);
1013         ldap_pvt_thread_mutex_unlock( &op->o_counters->sc_mutex );
1014
1015         op->o_threadctx = ctx;
1016         op->o_tid = ldap_pvt_thread_pool_tid( ctx );
1017
1018         switch ( tag ) {
1019         case LDAP_REQ_BIND:
1020         case LDAP_REQ_UNBIND:
1021         case LDAP_REQ_ADD:
1022         case LDAP_REQ_DELETE:
1023         case LDAP_REQ_MODDN:
1024         case LDAP_REQ_MODIFY:
1025         case LDAP_REQ_COMPARE:
1026         case LDAP_REQ_SEARCH:
1027         case LDAP_REQ_ABANDON:
1028         case LDAP_REQ_EXTENDED:
1029                 break;
1030         default:
1031                 Debug( LDAP_DEBUG_ANY, "connection_operation: "
1032                         "conn %lu unknown LDAP request 0x%lx\n",
1033                         conn->c_connid, tag, 0 );
1034                 op->o_tag = LBER_ERROR;
1035                 rs.sr_err = LDAP_PROTOCOL_ERROR;
1036                 rs.sr_text = "unknown LDAP request";
1037                 send_ldap_disconnect( op, &rs );
1038                 rc = SLAPD_DISCONNECT;
1039                 goto operations_error;
1040         }
1041
1042         if( conn->c_sasl_bind_in_progress && tag != LDAP_REQ_BIND ) {
1043                 Debug( LDAP_DEBUG_ANY, "connection_operation: "
1044                         "error: SASL bind in progress (tag=%ld).\n",
1045                         (long) tag, 0, 0 );
1046                 send_ldap_error( op, &rs, LDAP_OPERATIONS_ERROR,
1047                         "SASL bind in progress" );
1048                 rc = LDAP_OPERATIONS_ERROR;
1049                 goto operations_error;
1050         }
1051
1052 #ifdef LDAP_X_TXN
1053         if (( conn->c_txn == CONN_TXN_SPECIFY ) && (
1054                 ( tag == LDAP_REQ_ADD ) ||
1055                 ( tag == LDAP_REQ_DELETE ) ||
1056                 ( tag == LDAP_REQ_MODIFY ) ||
1057                 ( tag == LDAP_REQ_MODRDN )))
1058         {
1059                 /* Disable SLAB allocator for all update operations
1060                         issued inside of a transaction */
1061                 op->o_tmpmemctx = NULL;
1062                 op->o_tmpmfuncs = &ch_mfuncs;
1063         } else
1064 #endif
1065         {
1066         /* We can use Thread-Local storage for most mallocs. We can
1067          * also use TL for ber parsing, but not on Add or Modify.
1068          */
1069 #if 0
1070         memsiz = ber_len( op->o_ber ) * 64;
1071         if ( SLAP_SLAB_SIZE > memsiz ) memsiz = SLAP_SLAB_SIZE;
1072 #endif
1073         memsiz = SLAP_SLAB_SIZE;
1074
1075         memctx = slap_sl_mem_create( memsiz, SLAP_SLAB_STACK, ctx, 1 );
1076         op->o_tmpmemctx = memctx;
1077         op->o_tmpmfuncs = &slap_sl_mfuncs;
1078         if ( tag != LDAP_REQ_ADD && tag != LDAP_REQ_MODIFY ) {
1079                 /* Note - the ber and its buffer are already allocated from
1080                  * regular memory; this only affects subsequent mallocs that
1081                  * ber_scanf may invoke.
1082                  */
1083                 ber_set_option( op->o_ber, LBER_OPT_BER_MEMCTX, &memctx );
1084         }
1085         }
1086
1087         opidx = slap_req2op( tag );
1088         assert( opidx != SLAP_OP_LAST );
1089         INCR_OP_INITIATED( opidx );
1090         rc = (*(opfun[opidx]))( op, &rs );
1091
1092 operations_error:
1093         if ( rc == SLAPD_DISCONNECT ) {
1094                 tag = LBER_ERROR;
1095
1096         } else if ( opidx != SLAP_OP_LAST ) {
1097                 /* increment completed operations count
1098                  * only if operation was initiated
1099                  * and rc != SLAPD_DISCONNECT */
1100                 INCR_OP_COMPLETED( opidx );
1101         }
1102
1103         if ( op->o_cancel == SLAP_CANCEL_REQ ) {
1104                 if ( rc == SLAPD_ABANDON ) {
1105                         op->o_cancel = SLAP_CANCEL_ACK;
1106                 } else {
1107                         op->o_cancel = LDAP_TOO_LATE;
1108                 }
1109         }
1110
1111         while ( op->o_cancel != SLAP_CANCEL_NONE &&
1112                 op->o_cancel != SLAP_CANCEL_DONE )
1113         {
1114                 ldap_pvt_thread_yield();
1115         }
1116
1117         ldap_pvt_thread_mutex_lock( &conn->c_mutex );
1118
1119         ber_set_option( op->o_ber, LBER_OPT_BER_MEMCTX, &memctx_null );
1120
1121         LDAP_STAILQ_REMOVE( &conn->c_ops, op, Operation, o_next);
1122         LDAP_STAILQ_NEXT(op, o_next) = NULL;
1123         conn->c_n_ops_executing--;
1124         conn->c_n_ops_completed++;
1125
1126         switch( tag ) {
1127         case LBER_ERROR:
1128         case LDAP_REQ_UNBIND:
1129                 /* c_mutex is locked */
1130                 connection_closing( conn,
1131                         tag == LDAP_REQ_UNBIND ? NULL : "operations error" );
1132                 break;
1133         }
1134
1135         connection_resched( conn );
1136         ldap_pvt_thread_mutex_unlock( &conn->c_mutex );
1137         slap_op_free( op, ctx );
1138         return NULL;
1139 }
1140
1141 static const Listener dummy_list = { BER_BVC(""), BER_BVC("") };
1142
1143 Connection *connection_client_setup(
1144         ber_socket_t s,
1145         ldap_pvt_thread_start_t *func,
1146         void *arg )
1147 {
1148         Connection *c;
1149         ber_socket_t sfd = SLAP_SOCKNEW( s );
1150
1151         c = connection_init( sfd, (Listener *)&dummy_list, "", "",
1152                 CONN_IS_CLIENT, 0, NULL
1153                 LDAP_PF_LOCAL_SENDMSG_ARG(NULL));
1154         if ( c ) {
1155                 c->c_clientfunc = func;
1156                 c->c_clientarg = arg;
1157
1158                 slapd_add_internal( sfd, 0 );
1159         }
1160         return c;
1161 }
1162
1163 void connection_client_enable(
1164         Connection *c )
1165 {
1166         slapd_set_read( c->c_sd, 1 );
1167 }
1168
1169 void connection_client_stop(
1170         Connection *c )
1171 {
1172         Sockbuf *sb;
1173         ber_socket_t s = c->c_sd;
1174
1175         /* get (locked) connection */
1176         c = connection_get( s );
1177
1178         assert( c->c_conn_state == SLAP_C_CLIENT );
1179
1180         c->c_listener = NULL;
1181         c->c_conn_state = SLAP_C_INVALID;
1182         c->c_struct_state = SLAP_C_UNUSED;
1183         c->c_sd = AC_SOCKET_INVALID;
1184         c->c_close_reason = "?";                        /* should never be needed */
1185         sb = c->c_sb;
1186         c->c_sb = ber_sockbuf_alloc( );
1187         {
1188                 ber_len_t max = sockbuf_max_incoming;
1189                 ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_SET_MAX_INCOMING, &max );
1190         }
1191         slapd_remove( s, sb, 0, 1, 0 );
1192
1193         connection_return( c );
1194 }
1195
1196 static int connection_read( ber_socket_t s, conn_readinfo *cri );
1197
1198 static void* connection_read_thread( void* ctx, void* argv )
1199 {
1200         int rc ;
1201         conn_readinfo cri = { NULL, NULL, NULL, NULL, 0 };
1202         ber_socket_t s = (long)argv;
1203
1204         /*
1205          * read incoming LDAP requests. If there is more than one,
1206          * the first one is returned with new_op
1207          */
1208         cri.ctx = ctx;
1209         if( ( rc = connection_read( s, &cri ) ) < 0 ) {
1210                 Debug( LDAP_DEBUG_CONNS, "connection_read(%d) error\n", s, 0, 0 );
1211                 return (void*)(long)rc;
1212         }
1213
1214         /* execute a single queued request in the same thread */
1215         if( cri.op && !cri.nullop ) {
1216                 rc = (long)connection_operation( ctx, cri.op );
1217         } else if ( cri.func ) {
1218                 rc = (long)cri.func( ctx, cri.arg );
1219         }
1220
1221         return (void*)(long)rc;
1222 }
1223
1224 int connection_read_activate( ber_socket_t s )
1225 {
1226         int rc;
1227
1228         /*
1229          * suspend reading on this file descriptor until a connection processing
1230          * thread reads data on it. Otherwise the listener thread will repeatedly
1231          * submit the same event on it to the pool.
1232          */
1233         rc = slapd_clr_read( s, 0 );
1234         if ( rc )
1235                 return rc;
1236
1237         rc = ldap_pvt_thread_pool_submit( &connection_pool,
1238                 connection_read_thread, (void *)(long)s );
1239
1240         if( rc != 0 ) {
1241                 Debug( LDAP_DEBUG_ANY,
1242                         "connection_read_activate(%d): submit failed (%d)\n",
1243                         s, rc, 0 );
1244         }
1245
1246         return rc;
1247 }
1248
1249 static int
1250 connection_read( ber_socket_t s, conn_readinfo *cri )
1251 {
1252         int rc = 0;
1253         Connection *c;
1254
1255         assert( connections != NULL );
1256
1257         /* get (locked) connection */
1258         c = connection_get( s );
1259
1260         if( c == NULL ) {
1261                 Debug( LDAP_DEBUG_ANY,
1262                         "connection_read(%ld): no connection!\n",
1263                         (long) s, 0, 0 );
1264
1265                 return -1;
1266         }
1267
1268         c->c_n_read++;
1269
1270         if( c->c_conn_state == SLAP_C_CLOSING ) {
1271                 Debug( LDAP_DEBUG_TRACE,
1272                         "connection_read(%d): closing, ignoring input for id=%lu\n",
1273                         s, c->c_connid, 0 );
1274                 connection_return( c );
1275                 return 0;
1276         }
1277
1278         if ( c->c_conn_state == SLAP_C_CLIENT ) {
1279                 cri->func = c->c_clientfunc;
1280                 cri->arg = c->c_clientarg;
1281                 /* read should already be cleared */
1282                 connection_return( c );
1283                 return 0;
1284         }
1285
1286         Debug( LDAP_DEBUG_TRACE,
1287                 "connection_read(%d): checking for input on id=%lu\n",
1288                 s, c->c_connid, 0 );
1289
1290 #ifdef HAVE_TLS
1291         if ( c->c_is_tls && c->c_needs_tls_accept ) {
1292                 rc = ldap_pvt_tls_accept( c->c_sb, slap_tls_ctx );
1293                 if ( rc < 0 ) {
1294                         Debug( LDAP_DEBUG_TRACE,
1295                                 "connection_read(%d): TLS accept failure "
1296                                 "error=%d id=%lu, closing\n",
1297                                 s, rc, c->c_connid );
1298
1299                         c->c_needs_tls_accept = 0;
1300                         /* c_mutex is locked */
1301                         connection_closing( c, "TLS negotiation failure" );
1302                         connection_close( c );
1303                         connection_return( c );
1304                         return 0;
1305
1306                 } else if ( rc == 0 ) {
1307                         void *ssl;
1308                         struct berval authid = BER_BVNULL;
1309
1310                         c->c_needs_tls_accept = 0;
1311
1312                         /* we need to let SASL know */
1313                         ssl = ldap_pvt_tls_sb_ctx( c->c_sb );
1314
1315                         c->c_tls_ssf = (slap_ssf_t) ldap_pvt_tls_get_strength( ssl );
1316                         if( c->c_tls_ssf > c->c_ssf ) {
1317                                 c->c_ssf = c->c_tls_ssf;
1318                         }
1319
1320                         rc = dnX509peerNormalize( ssl, &authid );
1321                         if ( rc != LDAP_SUCCESS ) {
1322                                 Debug( LDAP_DEBUG_TRACE, "connection_read(%d): "
1323                                         "unable to get TLS client DN, error=%d id=%lu\n",
1324                                         s, rc, c->c_connid );
1325                         }
1326                         Statslog( LDAP_DEBUG_STATS,
1327                                 "conn=%lu fd=%d TLS established tls_ssf=%u ssf=%u\n",
1328                             c->c_connid, (int) s, c->c_tls_ssf, c->c_ssf, 0 );
1329                         slap_sasl_external( c, c->c_tls_ssf, &authid );
1330                         if ( authid.bv_val ) free( authid.bv_val );
1331                 }
1332
1333                 /* if success and data is ready, fall thru to data input loop */
1334                 if( !ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_DATA_READY, NULL ) )
1335                 {
1336                         slapd_set_read( s, 1 );
1337                         connection_return( c );
1338                         return 0;
1339                 }
1340         }
1341 #endif
1342
1343 #ifdef HAVE_CYRUS_SASL
1344         if ( c->c_sasl_layers ) {
1345                 /* If previous layer is not removed yet, give up for now */
1346                 if ( !c->c_sasl_sockctx ) {
1347                         slapd_set_read( s, 1 );
1348                         connection_return( c );
1349                         return 0;
1350                 }
1351
1352                 c->c_sasl_layers = 0;
1353
1354                 rc = ldap_pvt_sasl_install( c->c_sb, c->c_sasl_sockctx );
1355                 if( rc != LDAP_SUCCESS ) {
1356                         Debug( LDAP_DEBUG_TRACE,
1357                                 "connection_read(%d): SASL install error "
1358                                 "error=%d id=%lu, closing\n",
1359                                 s, rc, c->c_connid );
1360
1361                         /* c_mutex is locked */
1362                         connection_closing( c, "SASL layer install failure" );
1363                         connection_close( c );
1364                         connection_return( c );
1365                         return 0;
1366                 }
1367         }
1368 #endif
1369
1370 #define CONNECTION_INPUT_LOOP 1
1371 /* #define      DATA_READY_LOOP 1 */
1372
1373         do {
1374                 /* How do we do this without getting into a busy loop ? */
1375                 rc = connection_input( c, cri );
1376         }
1377 #ifdef DATA_READY_LOOP
1378         while( !rc && ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_DATA_READY, NULL ));
1379 #elif defined CONNECTION_INPUT_LOOP
1380         while(!rc);
1381 #else
1382         while(0);
1383 #endif
1384
1385         if( rc < 0 ) {
1386                 Debug( LDAP_DEBUG_CONNS,
1387                         "connection_read(%d): input error=%d id=%lu, closing.\n",
1388                         s, rc, c->c_connid );
1389
1390                 /* c_mutex is locked */
1391                 connection_closing( c, conn_lost_str );
1392                 connection_close( c );
1393                 connection_return( c );
1394                 return 0;
1395         }
1396
1397         if ( ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_NEEDS_WRITE, NULL ) ) {
1398                 slapd_set_write( s, 0 );
1399         }
1400
1401         slapd_set_read( s, 1 );
1402         connection_return( c );
1403
1404         return 0;
1405 }
1406
1407 static int
1408 connection_input( Connection *conn , conn_readinfo *cri )
1409 {
1410         Operation *op;
1411         ber_tag_t       tag;
1412         ber_len_t       len;
1413         ber_int_t       msgid;
1414         BerElement      *ber;
1415         int             rc;
1416 #ifdef LDAP_CONNECTIONLESS
1417         Sockaddr        peeraddr;
1418         char            *cdn = NULL;
1419 #endif
1420         char *defer = NULL;
1421         void *ctx;
1422
1423         if ( conn->c_currentber == NULL &&
1424                 ( conn->c_currentber = ber_alloc()) == NULL )
1425         {
1426                 Debug( LDAP_DEBUG_ANY, "ber_alloc failed\n", 0, 0, 0 );
1427                 return -1;
1428         }
1429
1430         sock_errset(0);
1431
1432 #ifdef LDAP_CONNECTIONLESS
1433         if ( conn->c_is_udp ) {
1434                 char peername[sizeof("IP=255.255.255.255:65336")];
1435
1436                 len = ber_int_sb_read(conn->c_sb, &peeraddr, sizeof(struct sockaddr));
1437                 if (len != sizeof(struct sockaddr)) return 1;
1438
1439                 sprintf( peername, "IP=%s:%d",
1440                         inet_ntoa( peeraddr.sa_in_addr.sin_addr ),
1441                         (unsigned) ntohs( peeraddr.sa_in_addr.sin_port ) );
1442                 Statslog( LDAP_DEBUG_STATS,
1443                         "conn=%lu UDP request from %s (%s) accepted.\n",
1444                         conn->c_connid, peername, conn->c_sock_name.bv_val, 0, 0 );
1445         }
1446 #endif
1447
1448         tag = ber_get_next( conn->c_sb, &len, conn->c_currentber );
1449         if ( tag != LDAP_TAG_MESSAGE ) {
1450                 int err = sock_errno();
1451
1452                 if ( err != EWOULDBLOCK && err != EAGAIN ) {
1453                         /* log, close and send error */
1454                         Debug( LDAP_DEBUG_TRACE,
1455                                 "ber_get_next on fd %d failed errno=%d (%s)\n",
1456                         conn->c_sd, err, sock_errstr(err) );
1457                         ber_free( conn->c_currentber, 1 );
1458                         conn->c_currentber = NULL;
1459
1460                         return -2;
1461                 }
1462                 return 1;
1463         }
1464
1465         ber = conn->c_currentber;
1466         conn->c_currentber = NULL;
1467
1468         if ( (tag = ber_get_int( ber, &msgid )) != LDAP_TAG_MSGID ) {
1469                 /* log, close and send error */
1470                 Debug( LDAP_DEBUG_ANY, "ber_get_int returns 0x%lx\n", tag, 0, 0 );
1471                 ber_free( ber, 1 );
1472                 return -1;
1473         }
1474
1475         if ( (tag = ber_peek_tag( ber, &len )) == LBER_ERROR ) {
1476                 /* log, close and send error */
1477                 Debug( LDAP_DEBUG_ANY, "ber_peek_tag returns 0x%lx\n", tag, 0, 0 );
1478                 ber_free( ber, 1 );
1479
1480                 return -1;
1481         }
1482
1483 #ifdef LDAP_CONNECTIONLESS
1484         if( conn->c_is_udp ) {
1485                 if( tag == LBER_OCTETSTRING ) {
1486                         ber_get_stringa( ber, &cdn );
1487                         tag = ber_peek_tag(ber, &len);
1488                 }
1489                 if( tag != LDAP_REQ_ABANDON && tag != LDAP_REQ_SEARCH ) {
1490                         Debug( LDAP_DEBUG_ANY, "invalid req for UDP 0x%lx\n", tag, 0, 0 );
1491                         ber_free( ber, 1 );
1492                         return 0;
1493                 }
1494         }
1495 #endif
1496
1497         if(tag == LDAP_REQ_BIND) {
1498                 /* immediately abandon all existing operations upon BIND */
1499                 connection_abandon( conn );
1500         }
1501
1502         ctx = cri->ctx;
1503         op = slap_op_alloc( ber, msgid, tag, conn->c_n_ops_received++, ctx );
1504
1505         op->o_conn = conn;
1506         /* clear state if the connection is being reused from inactive */
1507         if ( conn->c_conn_state == SLAP_C_INACTIVE ) {
1508                 memset( &conn->c_pagedresults_state, 0,
1509                         sizeof( conn->c_pagedresults_state ) );
1510         }
1511
1512         op->o_res_ber = NULL;
1513
1514 #ifdef LDAP_CONNECTIONLESS
1515         if (conn->c_is_udp) {
1516                 if ( cdn ) {
1517                         ber_str2bv( cdn, 0, 1, &op->o_dn );
1518                         op->o_protocol = LDAP_VERSION2;
1519                 }
1520                 op->o_res_ber = ber_alloc_t( LBER_USE_DER );
1521                 if (op->o_res_ber == NULL) return 1;
1522
1523                 rc = ber_write( op->o_res_ber, (char *)&peeraddr,
1524                         sizeof(struct sockaddr), 0 );
1525
1526                 if (rc != sizeof(struct sockaddr)) {
1527                         Debug( LDAP_DEBUG_ANY, "ber_write failed\n", 0, 0, 0 );
1528                         return 1;
1529                 }
1530
1531                 if (op->o_protocol == LDAP_VERSION2) {
1532                         rc = ber_printf(op->o_res_ber, "{is{" /*}}*/, op->o_msgid, "");
1533                         if (rc == -1) {
1534                                 Debug( LDAP_DEBUG_ANY, "ber_write failed\n", 0, 0, 0 );
1535                                 return rc;
1536                         }
1537                 }
1538         }
1539 #endif /* LDAP_CONNECTIONLESS */
1540
1541         rc = 0;
1542
1543         /* Don't process requests when the conn is in the middle of a
1544          * Bind, or if it's closing. Also, don't let any single conn
1545          * use up all the available threads, and don't execute if we're
1546          * currently blocked on output. And don't execute if there are
1547          * already pending ops, let them go first.  Abandon operations
1548          * get exceptions to some, but not all, cases.
1549          */
1550         switch( tag ){
1551         default:
1552                 /* Abandon and Unbind are exempt from these checks */
1553                 if (conn->c_conn_state == SLAP_C_CLOSING) {
1554                         defer = "closing";
1555                         break;
1556                 } else if (conn->c_writewaiter) {
1557                         defer = "awaiting write";
1558                         break;
1559                 } else if (conn->c_n_ops_pending) {
1560                         defer = "pending operations";
1561                         break;
1562                 }
1563                 /* FALLTHRU */
1564         case LDAP_REQ_ABANDON:
1565                 /* Unbind is exempt from these checks */
1566                 if (conn->c_n_ops_executing >= connection_pool_max/2) {
1567                         defer = "too many executing";
1568                         break;
1569                 } else if (conn->c_conn_state == SLAP_C_BINDING) {
1570                         defer = "binding";
1571                         break;
1572                 }
1573                 /* FALLTHRU */
1574         case LDAP_REQ_UNBIND:
1575                 break;
1576         }
1577
1578         if( defer ) {
1579                 int max = conn->c_dn.bv_len
1580                         ? slap_conn_max_pending_auth
1581                         : slap_conn_max_pending;
1582
1583                 Debug( LDAP_DEBUG_ANY,
1584                         "connection_input: conn=%lu deferring operation: %s\n",
1585                         conn->c_connid, defer, 0 );
1586                 conn->c_n_ops_pending++;
1587                 LDAP_STAILQ_INSERT_TAIL( &conn->c_pending_ops, op, o_next );
1588                 rc = ( conn->c_n_ops_pending > max ) ? -1 : 0;
1589
1590         } else {
1591                 conn->c_n_ops_executing++;
1592
1593                 /*
1594                  * The first op will be processed in the same thread context,
1595                  * as long as there is only one op total.
1596                  * Subsequent ops will be submitted to the pool by
1597                  * calling connection_op_activate()
1598                  */
1599                 if ( cri->op == NULL ) {
1600                         /* the first incoming request */
1601                         connection_op_queue( op );
1602                         cri->op = op;
1603                 } else {
1604                         if ( !cri->nullop ) {
1605                                 cri->nullop = 1;
1606                                 rc = ldap_pvt_thread_pool_submit( &connection_pool,
1607                                         connection_operation, (void *) cri->op );
1608                         }
1609                         connection_op_activate( op );
1610                 }
1611         }
1612
1613 #ifdef NO_THREADS
1614         if ( conn->c_struct_state != SLAP_C_USED ) {
1615                 /* connection must have got closed underneath us */
1616                 return 1;
1617         }
1618 #endif
1619
1620         assert( conn->c_struct_state == SLAP_C_USED );
1621         return rc;
1622 }
1623
1624 static int
1625 connection_resched( Connection *conn )
1626 {
1627         Operation *op;
1628
1629         if( conn->c_writewaiter )
1630                 return 0;
1631
1632         if( conn->c_conn_state == SLAP_C_CLOSING ) {
1633                 Debug( LDAP_DEBUG_TRACE, "connection_resched: "
1634                         "attempting closing conn=%lu sd=%d\n",
1635                         conn->c_connid, conn->c_sd, 0 );
1636                 connection_close( conn );
1637                 return 0;
1638         }
1639
1640         if( conn->c_conn_state != SLAP_C_ACTIVE ) {
1641                 /* other states need different handling */
1642                 return 0;
1643         }
1644
1645         while ((op = LDAP_STAILQ_FIRST( &conn->c_pending_ops )) != NULL) {
1646                 if ( conn->c_n_ops_executing > connection_pool_max/2 ) break;
1647
1648                 LDAP_STAILQ_REMOVE_HEAD( &conn->c_pending_ops, o_next );
1649                 LDAP_STAILQ_NEXT(op, o_next) = NULL;
1650
1651                 /* pending operations should not be marked for abandonment */
1652                 assert(!op->o_abandon);
1653
1654                 conn->c_n_ops_pending--;
1655                 conn->c_n_ops_executing++;
1656
1657                 connection_op_activate( op );
1658
1659                 if ( conn->c_conn_state == SLAP_C_BINDING ) break;
1660         }
1661         return 0;
1662 }
1663
1664 static void
1665 connection_init_log_prefix( Operation *op )
1666 {
1667         if ( op->o_connid == (unsigned long)(-1) ) {
1668                 snprintf( op->o_log_prefix, sizeof( op->o_log_prefix ),
1669                         "conn=-1 op=%lu", op->o_opid );
1670
1671         } else {
1672                 snprintf( op->o_log_prefix, sizeof( op->o_log_prefix ),
1673                         "conn=%lu op=%lu", op->o_connid, op->o_opid );
1674         }
1675 }
1676
1677 static int connection_bind_cleanup_cb( Operation *op, SlapReply *rs )
1678 {
1679         op->o_conn->c_sasl_bindop = NULL;
1680
1681         ch_free( op->o_callback );
1682         op->o_callback = NULL;
1683
1684         return SLAP_CB_CONTINUE;
1685 }
1686
1687 static int connection_bind_cb( Operation *op, SlapReply *rs )
1688 {
1689         ldap_pvt_thread_mutex_lock( &op->o_conn->c_mutex );
1690         if ( op->o_conn->c_conn_state == SLAP_C_BINDING )
1691                 op->o_conn->c_conn_state = SLAP_C_ACTIVE;
1692         op->o_conn->c_sasl_bind_in_progress =
1693                 ( rs->sr_err == LDAP_SASL_BIND_IN_PROGRESS );
1694
1695         /* Moved here from bind.c due to ITS#4158 */
1696         op->o_conn->c_sasl_bindop = NULL;
1697         if ( op->orb_method == LDAP_AUTH_SASL ) {
1698                 if( rs->sr_err == LDAP_SUCCESS ) {
1699                         ber_dupbv(&op->o_conn->c_dn, &op->orb_edn);
1700                         if( !BER_BVISEMPTY( &op->orb_edn ) ) {
1701                                 /* edn is always normalized already */
1702                                 ber_dupbv( &op->o_conn->c_ndn, &op->o_conn->c_dn );
1703                         }
1704                         op->o_tmpfree( op->orb_edn.bv_val, op->o_tmpmemctx );
1705                         BER_BVZERO( &op->orb_edn );
1706                         op->o_conn->c_authmech = op->o_conn->c_sasl_bind_mech;
1707                         BER_BVZERO( &op->o_conn->c_sasl_bind_mech );
1708
1709                         op->o_conn->c_sasl_ssf = op->orb_ssf;
1710                         if( op->orb_ssf > op->o_conn->c_ssf ) {
1711                                 op->o_conn->c_ssf = op->orb_ssf;
1712                         }
1713
1714                         if( !BER_BVISEMPTY( &op->o_conn->c_dn ) ) {
1715                                 ber_len_t max = sockbuf_max_incoming_auth;
1716                                 ber_sockbuf_ctrl( op->o_conn->c_sb,
1717                                         LBER_SB_OPT_SET_MAX_INCOMING, &max );
1718                         }
1719
1720                         /* log authorization identity */
1721                         Statslog( LDAP_DEBUG_STATS,
1722                                 "%s BIND dn=\"%s\" mech=%s sasl_ssf=%d ssf=%d\n",
1723                                 op->o_log_prefix,
1724                                 BER_BVISNULL( &op->o_conn->c_dn ) ? "<empty>" : op->o_conn->c_dn.bv_val,
1725                                 op->o_conn->c_authmech.bv_val,
1726                                 op->orb_ssf, op->o_conn->c_ssf );
1727
1728                         Debug( LDAP_DEBUG_TRACE,
1729                                 "do_bind: SASL/%s bind: dn=\"%s\" sasl_ssf=%d\n",
1730                                 op->o_conn->c_authmech.bv_val,
1731                                 BER_BVISNULL( &op->o_conn->c_dn ) ? "<empty>" : op->o_conn->c_dn.bv_val,
1732                                 op->orb_ssf );
1733
1734                 } else if ( rs->sr_err != LDAP_SASL_BIND_IN_PROGRESS ) {
1735                         if ( !BER_BVISNULL( &op->o_conn->c_sasl_bind_mech ) ) {
1736                                 free( op->o_conn->c_sasl_bind_mech.bv_val );
1737                                 BER_BVZERO( &op->o_conn->c_sasl_bind_mech );
1738                         }
1739                 }
1740         }
1741         ldap_pvt_thread_mutex_unlock( &op->o_conn->c_mutex );
1742
1743         ch_free( op->o_callback );
1744         op->o_callback = NULL;
1745
1746         return SLAP_CB_CONTINUE;
1747 }
1748
1749 static void connection_op_queue( Operation *op )
1750 {
1751         ber_tag_t tag = op->o_tag;
1752
1753         if (tag == LDAP_REQ_BIND) {
1754                 slap_callback *sc = ch_calloc( 1, sizeof( slap_callback ));
1755                 sc->sc_response = connection_bind_cb;
1756                 sc->sc_cleanup = connection_bind_cleanup_cb;
1757                 sc->sc_next = op->o_callback;
1758                 op->o_callback = sc;
1759                 op->o_conn->c_conn_state = SLAP_C_BINDING;
1760         }
1761
1762         if (!op->o_dn.bv_len) {
1763                 op->o_authz = op->o_conn->c_authz;
1764                 if ( BER_BVISNULL( &op->o_conn->c_sasl_authz_dn )) {
1765                         ber_dupbv( &op->o_dn, &op->o_conn->c_dn );
1766                         ber_dupbv( &op->o_ndn, &op->o_conn->c_ndn );
1767                 } else {
1768                         ber_dupbv( &op->o_dn, &op->o_conn->c_sasl_authz_dn );
1769                         ber_dupbv( &op->o_ndn, &op->o_conn->c_sasl_authz_dn );
1770                 }
1771         }
1772
1773         op->o_authtype = op->o_conn->c_authtype;
1774         ber_dupbv( &op->o_authmech, &op->o_conn->c_authmech );
1775
1776         if (!op->o_protocol) {
1777                 op->o_protocol = op->o_conn->c_protocol
1778                         ? op->o_conn->c_protocol : LDAP_VERSION3;
1779         }
1780
1781         if (op->o_conn->c_conn_state == SLAP_C_INACTIVE &&
1782                 op->o_protocol > LDAP_VERSION2)
1783         {
1784                 op->o_conn->c_conn_state = SLAP_C_ACTIVE;
1785         }
1786
1787         op->o_connid = op->o_conn->c_connid;
1788         connection_init_log_prefix( op );
1789
1790         LDAP_STAILQ_INSERT_TAIL( &op->o_conn->c_ops, op, o_next );
1791 }
1792
1793 static int connection_op_activate( Operation *op )
1794 {
1795         int rc;
1796
1797         connection_op_queue( op );
1798
1799         rc = ldap_pvt_thread_pool_submit( &connection_pool,
1800                 connection_operation, (void *) op );
1801
1802         if ( rc != 0 ) {
1803                 Debug( LDAP_DEBUG_ANY,
1804                         "connection_op_activate: submit failed (%d) for conn=%lu\n",
1805                         rc, op->o_connid, 0 );
1806                 /* should move op to pending list */
1807         }
1808
1809         return rc;
1810 }
1811
1812 int connection_write(ber_socket_t s)
1813 {
1814         Connection *c;
1815         Operation *op;
1816
1817         assert( connections != NULL );
1818
1819         slapd_clr_write( s, 0 );
1820
1821         c = connection_get( s );
1822         if( c == NULL ) {
1823                 Debug( LDAP_DEBUG_ANY,
1824                         "connection_write(%ld): no connection!\n",
1825                         (long)s, 0, 0 );
1826                 return -1;
1827         }
1828
1829         c->c_n_write++;
1830
1831         Debug( LDAP_DEBUG_TRACE,
1832                 "connection_write(%d): waking output for id=%lu\n",
1833                 s, c->c_connid, 0 );
1834         ldap_pvt_thread_cond_signal( &c->c_write_cv );
1835
1836         if ( ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_NEEDS_READ, NULL ) ) {
1837                 slapd_set_read( s, 1 );
1838         }
1839         if ( ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_NEEDS_WRITE, NULL ) ) {
1840                 slapd_set_write( s, 1 );
1841         }
1842
1843         /* If there are ops pending because of a writewaiter,
1844          * start one up.
1845          */
1846         while ((op = LDAP_STAILQ_FIRST( &c->c_pending_ops )) != NULL) {
1847                 if ( !c->c_writewaiter ) break;
1848                 if ( c->c_n_ops_executing > connection_pool_max/2 ) break;
1849
1850                 LDAP_STAILQ_REMOVE_HEAD( &c->c_pending_ops, o_next );
1851                 LDAP_STAILQ_NEXT(op, o_next) = NULL;
1852
1853                 /* pending operations should not be marked for abandonment */
1854                 assert(!op->o_abandon);
1855
1856                 c->c_n_ops_pending--;
1857                 c->c_n_ops_executing++;
1858
1859                 connection_op_activate( op );
1860
1861                 break;
1862         }
1863
1864         connection_return( c );
1865         return 0;
1866 }
1867
1868 #ifdef LDAP_SLAPI
1869 typedef struct conn_fake_extblock {
1870         void *eb_conn;
1871         void *eb_op;
1872 } conn_fake_extblock;
1873
1874 static void
1875 connection_fake_destroy(
1876         void *key,
1877         void *data )
1878 {
1879         Connection conn = {0};
1880         Operation op = {0};
1881         Opheader ohdr = {0};
1882
1883         conn_fake_extblock *eb = data;
1884
1885         op.o_hdr = &ohdr;
1886         op.o_hdr->oh_extensions = eb->eb_op;
1887         conn.c_extensions = eb->eb_conn;
1888         op.o_conn = &conn;
1889         conn.c_connid = -1;
1890         op.o_connid = -1;
1891
1892         ber_memfree_x( eb, NULL );
1893         slapi_int_free_object_extensions( SLAPI_X_EXT_OPERATION, &op );
1894         slapi_int_free_object_extensions( SLAPI_X_EXT_CONNECTION, &conn );
1895 }
1896 #endif
1897
1898 void
1899 connection_fake_init(
1900         Connection *conn,
1901         OperationBuffer *opbuf,
1902         void *ctx )
1903 {
1904         connection_fake_init2( conn, opbuf, ctx, 1 );
1905 }
1906
1907 void
1908 operation_fake_init(
1909         Connection *conn,
1910         Operation *op,
1911         void *ctx,
1912         int newmem )
1913 {
1914         /* set memory context */
1915         op->o_tmpmemctx = slap_sl_mem_create(SLAP_SLAB_SIZE, SLAP_SLAB_STACK, ctx,
1916                 newmem );
1917         op->o_tmpmfuncs = &slap_sl_mfuncs;
1918         op->o_threadctx = ctx;
1919         op->o_tid = ldap_pvt_thread_pool_tid( ctx );
1920
1921         op->o_counters = &slap_counters;
1922         op->o_conn = conn;
1923         op->o_connid = op->o_conn->c_connid;
1924         connection_init_log_prefix( op );
1925 }
1926
1927
1928 void
1929 connection_fake_init2(
1930         Connection *conn,
1931         OperationBuffer *opbuf,
1932         void *ctx,
1933         int newmem )
1934 {
1935         Operation *op = (Operation *) opbuf;
1936
1937         conn->c_connid = -1;
1938         conn->c_conn_idx = -1;
1939         conn->c_send_ldap_result = slap_send_ldap_result;
1940         conn->c_send_search_entry = slap_send_search_entry;
1941         conn->c_send_search_reference = slap_send_search_reference;
1942         conn->c_listener = (Listener *)&dummy_list;
1943         conn->c_peer_domain = slap_empty_bv;
1944         conn->c_peer_name = slap_empty_bv;
1945
1946         memset( opbuf, 0, sizeof( *opbuf ));
1947         op->o_hdr = &opbuf->ob_hdr;
1948         op->o_controls = opbuf->ob_controls;
1949
1950         operation_fake_init( conn, op, ctx, newmem );
1951
1952 #ifdef LDAP_SLAPI
1953         if ( slapi_plugins_used ) {
1954                 conn_fake_extblock *eb;
1955                 void *ebx = NULL;
1956
1957                 /* Use thread keys to make sure these eventually get cleaned up */
1958                 if ( ldap_pvt_thread_pool_getkey( ctx, (void *)connection_fake_init,
1959                                 &ebx, NULL )) {
1960                         eb = ch_malloc( sizeof( *eb ));
1961                         slapi_int_create_object_extensions( SLAPI_X_EXT_CONNECTION, conn );
1962                         slapi_int_create_object_extensions( SLAPI_X_EXT_OPERATION, op );
1963                         eb->eb_conn = conn->c_extensions;
1964                         eb->eb_op = op->o_hdr->oh_extensions;
1965                         ldap_pvt_thread_pool_setkey( ctx, (void *)connection_fake_init,
1966                                 eb, connection_fake_destroy, NULL, NULL );
1967                 } else {
1968                         eb = ebx;
1969                         conn->c_extensions = eb->eb_conn;
1970                         op->o_hdr->oh_extensions = eb->eb_op;
1971                 }
1972         }
1973 #endif /* LDAP_SLAPI */
1974
1975         slap_op_time( &op->o_time, &op->o_tincr );
1976 }
1977
1978 void
1979 connection_assign_nextid( Connection *conn )
1980 {
1981         ldap_pvt_thread_mutex_lock( &conn_nextid_mutex );
1982         conn->c_connid = conn_nextid++;
1983         ldap_pvt_thread_mutex_unlock( &conn_nextid_mutex );
1984 }