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 1998-2012 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_CONNECTIONLESS
  43 #include "../../libraries/liblber/lber-int.h"   /* ber_int_sb_read() */
  44 #endif
  45
  46 #ifdef LDAP_SLAPI
  47 #include "slapi/slapi.h"
  48 #endif
  49
  50 /* protected by connections_mutex */
  51 static ldap_pvt_thread_mutex_t connections_mutex;
  52 static Connection *connections = NULL;
  53
  54 static ldap_pvt_thread_mutex_t conn_nextid_mutex;
  55 static unsigned long conn_nextid = SLAPD_SYNC_SYNCCONN_OFFSET;
  56
  57 static const char conn_lost_str[] = "connection lost";
  58
  59 const char *
  60 connection_state2str( int state )
  61 {
  62         switch( state ) {
  63         case SLAP_C_INVALID:    return "!";
  64         case SLAP_C_INACTIVE:   return "|";
  65         case SLAP_C_CLOSING:    return "C";
  66         case SLAP_C_ACTIVE:             return "";
  67         case SLAP_C_BINDING:    return "B";
  68         case SLAP_C_CLIENT:             return "L";
  69         }
  70
  71         return "?";
  72 }
  73
  74 static Connection* connection_get( ber_socket_t s );
  75
  76 typedef struct conn_readinfo {
  77         Operation *op;
  78         ldap_pvt_thread_start_t *func;
  79         void *arg;
  80         void *ctx;
  81         int nullop;
  82 } conn_readinfo;
  83
  84 static int connection_input( Connection *c, conn_readinfo *cri );
  85 static void connection_close( Connection *c );
  86
  87 static int connection_op_activate( Operation *op );
  88 static void connection_op_queue( Operation *op );
  89 static int connection_resched( Connection *conn );
  90 static void connection_abandon( Connection *conn );
  91 static void connection_destroy( Connection *c );
  92
  93 static ldap_pvt_thread_start_t connection_operation;
  94
  95 /*
  96  * Initialize connection management infrastructure.
  97  */
  98 int connections_init(void)
  99 {
 100         int i;
 101
 102         assert( connections == NULL );
 103
 104         if( connections != NULL) {
 105                 Debug( LDAP_DEBUG_ANY, "connections_init: already initialized.\n",
 106                         0, 0, 0 );
 107                 return -1;
 108         }
 109
 110         /* should check return of every call */
 111         ldap_pvt_thread_mutex_init( &connections_mutex );
 112         ldap_pvt_thread_mutex_init( &conn_nextid_mutex );
 113
 114         connections = (Connection *) ch_calloc( dtblsize, sizeof(Connection) );
 115
 116         if( connections == NULL ) {
 117                 Debug( LDAP_DEBUG_ANY, "connections_init: "
 118                         "allocation (%d*%ld) of connection array failed\n",
 119                         dtblsize, (long) sizeof(Connection), 0 );
 120                 return -1;
 121         }
 122
 123         assert( connections[0].c_struct_state == SLAP_C_UNINITIALIZED );
 124         assert( connections[dtblsize-1].c_struct_state == SLAP_C_UNINITIALIZED );
 125
 126         for (i=0; i<dtblsize; i++) connections[i].c_conn_idx = i;
 127
 128         /*
 129          * per entry initialization of the Connection array initialization
 130          * will be done by connection_init()
 131          */
 132
 133         return 0;
 134 }
 135
 136 /*
 137  * Destroy connection management infrastructure.
 138  */
 139
 140 int connections_destroy(void)
 141 {
 142         ber_socket_t i;
 143
 144         /* should check return of every call */
 145
 146         if( connections == NULL) {
 147                 Debug( LDAP_DEBUG_ANY, "connections_destroy: nothing to destroy.\n",
 148                         0, 0, 0 );
 149                 return -1;
 150         }
 151
 152         for ( i = 0; i < dtblsize; i++ ) {
 153                 if( connections[i].c_struct_state != SLAP_C_UNINITIALIZED ) {
 154                         ber_sockbuf_free( connections[i].c_sb );
 155                         ldap_pvt_thread_mutex_destroy( &connections[i].c_mutex );
 156                         ldap_pvt_thread_mutex_destroy( &connections[i].c_write1_mutex );
 157                         ldap_pvt_thread_mutex_destroy( &connections[i].c_write2_mutex );
 158                         ldap_pvt_thread_cond_destroy( &connections[i].c_write1_cv );
 159                         ldap_pvt_thread_cond_destroy( &connections[i].c_write2_cv );
 160 #ifdef LDAP_SLAPI
 161                         if ( slapi_plugins_used ) {
 162                                 slapi_int_free_object_extensions( SLAPI_X_EXT_CONNECTION,
 163                                         &connections[i] );
 164                         }
 165 #endif
 166                 }
 167         }
 168
 169         free( connections );
 170         connections = NULL;
 171
 172         ldap_pvt_thread_mutex_destroy( &connections_mutex );
 173         ldap_pvt_thread_mutex_destroy( &conn_nextid_mutex );
 174         return 0;
 175 }
 176
 177 /*
 178  * shutdown all connections
 179  */
 180 int connections_shutdown(void)
 181 {
 182         ber_socket_t i;
 183
 184         for ( i = 0; i < dtblsize; i++ ) {
 185                 if( connections[i].c_struct_state != SLAP_C_UNINITIALIZED ) {
 186                         ldap_pvt_thread_mutex_lock( &connections[i].c_mutex );
 187                         if( connections[i].c_struct_state == SLAP_C_USED ) {
 188
 189                                 /* give persistent clients a chance to cleanup */
 190                                 if( connections[i].c_conn_state == SLAP_C_CLIENT ) {
 191                                         ldap_pvt_thread_pool_submit( &connection_pool,
 192                                         connections[i].c_clientfunc, connections[i].c_clientarg );
 193                                 } else {
 194                                         /* c_mutex is locked */
 195                                         connection_closing( &connections[i], "slapd shutdown" );
 196                                         connection_close( &connections[i] );
 197                                 }
 198                         }
 199                         ldap_pvt_thread_mutex_unlock( &connections[i].c_mutex );
 200                 }
 201         }
 202
 203         return 0;
 204 }
 205
 206 /*
 207  * Timeout idle connections.
 208  */
 209 int connections_timeout_idle(time_t now)
 210 {
 211         int i = 0, writers = 0;
 212         int connindex;
 213         Connection* c;
 214         time_t old;
 215
 216         old = slapd_get_writetime();
 217
 218         for( c = connection_first( &connindex );
 219                 c != NULL;
 220                 c = connection_next( c, &connindex ) )
 221         {
 222                 /* Don't timeout a slow-running request or a persistent
 223                  * outbound connection. But if it has a writewaiter, see
 224                  * if the waiter has been there too long.
 225                  */
 226                 if(( c->c_n_ops_executing && !c->c_writewaiter)
 227                         || c->c_conn_state == SLAP_C_CLIENT ) {
 228                         continue;
 229                 }
 230
 231                 if( global_idletimeout &&
 232                         difftime( c->c_activitytime+global_idletimeout, now) < 0 ) {
 233                         /* close it */
 234                         connection_closing( c, "idletimeout" );
 235                         connection_close( c );
 236                         i++;
 237                         continue;
 238                 }
 239                 if ( c->c_writewaiter && global_writetimeout ) {
 240                         writers = 1;
 241                         if( difftime( c->c_activitytime+global_writetimeout, now) < 0 ) {
 242                                 /* close it */
 243                                 connection_closing( c, "writetimeout" );
 244                                 connection_close( c );
 245                                 i++;
 246                                 continue;
 247                         }
 248                 }
 249         }
 250         connection_done( c );
 251         if ( old && !writers )
 252                 slapd_clr_writetime( old );
 253
 254         return i;
 255 }
 256
 257 /* Drop all client connections */
 258 void connections_drop()
 259 {
 260         Connection* c;
 261         int connindex;
 262
 263         for( c = connection_first( &connindex );
 264                 c != NULL;
 265                 c = connection_next( c, &connindex ) )
 266         {
 267                 /* Don't close a slow-running request or a persistent
 268                  * outbound connection.
 269                  */
 270                 if(( c->c_n_ops_executing && !c->c_writewaiter)
 271                         || c->c_conn_state == SLAP_C_CLIENT ) {
 272                         continue;
 273                 }
 274                 connection_closing( c, "dropping" );
 275                 connection_close( c );
 276         }
 277         connection_done( c );
 278 }
 279
 280 static Connection* connection_get( ber_socket_t s )
 281 {
 282         Connection *c;
 283
 284         Debug( LDAP_DEBUG_ARGS,
 285                 "connection_get(%ld)\n",
 286                 (long) s, 0, 0 );
 287
 288         assert( connections != NULL );
 289
 290         if(s == AC_SOCKET_INVALID) return NULL;
 291
 292         assert( s < dtblsize );
 293         c = &connections[s];
 294
 295         if( c != NULL ) {
 296                 ldap_pvt_thread_mutex_lock( &c->c_mutex );
 297
 298                 assert( c->c_struct_state != SLAP_C_UNINITIALIZED );
 299
 300                 if( c->c_struct_state != SLAP_C_USED ) {
 301                         /* connection must have been closed due to resched */
 302
 303                         Debug( LDAP_DEBUG_CONNS,
 304                                 "connection_get(%d): connection not used\n",
 305                                 s, 0, 0 );
 306                         assert( c->c_conn_state == SLAP_C_INVALID );
 307                         assert( c->c_sd == AC_SOCKET_INVALID );
 308
 309                         ldap_pvt_thread_mutex_unlock( &c->c_mutex );
 310                         return NULL;
 311                 }
 312
 313                 Debug( LDAP_DEBUG_TRACE,
 314                         "connection_get(%d): got connid=%lu\n",
 315                         s, c->c_connid, 0 );
 316
 317                 c->c_n_get++;
 318
 319                 assert( c->c_struct_state == SLAP_C_USED );
 320                 assert( c->c_conn_state != SLAP_C_INVALID );
 321                 assert( c->c_sd != AC_SOCKET_INVALID );
 322
 323 #ifndef SLAPD_MONITOR
 324                 if ( global_idletimeout > 0 )
 325 #endif /* ! SLAPD_MONITOR */
 326                 {
 327                         c->c_activitytime = slap_get_time();
 328                 }
 329         }
 330
 331         return c;
 332 }
 333
 334 static void connection_return( Connection *c )
 335 {
 336         ldap_pvt_thread_mutex_unlock( &c->c_mutex );
 337 }
 338
 339 Connection * connection_init(
 340         ber_socket_t s,
 341         Listener *listener,
 342         const char* dnsname,
 343         const char* peername,
 344         int flags,
 345         slap_ssf_t ssf,
 346         struct berval *authid
 347         LDAP_PF_LOCAL_SENDMSG_ARG(struct berval *peerbv))
 348 {
 349         unsigned long id;
 350         Connection *c;
 351         int doinit = 0;
 352         ber_socket_t sfd = SLAP_FD2SOCK(s);
 353
 354         assert( connections != NULL );
 355
 356         assert( listener != NULL );
 357         assert( dnsname != NULL );
 358         assert( peername != NULL );
 359
 360 #ifndef HAVE_TLS
 361         assert( !( flags & CONN_IS_TLS ));
 362 #endif
 363
 364         if( s == AC_SOCKET_INVALID ) {
 365                 Debug( LDAP_DEBUG_ANY,
 366                         "connection_init: init of socket %ld invalid.\n", (long)s, 0, 0 );
 367                 return NULL;
 368         }
 369
 370         assert( s >= 0 );
 371         assert( s < dtblsize );
 372         c = &connections[s];
 373         if( c->c_struct_state == SLAP_C_UNINITIALIZED ) {
 374                 doinit = 1;
 375         } else {
 376                 assert( c->c_struct_state == SLAP_C_UNUSED );
 377         }
 378
 379         if( doinit ) {
 380                 c->c_send_ldap_result = slap_send_ldap_result;
 381                 c->c_send_search_entry = slap_send_search_entry;
 382                 c->c_send_search_reference = slap_send_search_reference;
 383                 c->c_send_ldap_extended = slap_send_ldap_extended;
 384                 c->c_send_ldap_intermediate = slap_send_ldap_intermediate;
 385
 386                 BER_BVZERO( &c->c_authmech );
 387                 BER_BVZERO( &c->c_dn );
 388                 BER_BVZERO( &c->c_ndn );
 389
 390                 c->c_listener = NULL;
 391                 BER_BVZERO( &c->c_peer_domain );
 392                 BER_BVZERO( &c->c_peer_name );
 393
 394                 LDAP_STAILQ_INIT(&c->c_ops);
 395                 LDAP_STAILQ_INIT(&c->c_pending_ops);
 396
 397 #ifdef LDAP_X_TXN
 398                 c->c_txn = CONN_TXN_INACTIVE;
 399                 c->c_txn_backend = NULL;
 400                 LDAP_STAILQ_INIT(&c->c_txn_ops);
 401 #endif
 402
 403                 BER_BVZERO( &c->c_sasl_bind_mech );
 404                 c->c_sasl_done = 0;
 405                 c->c_sasl_authctx = NULL;
 406                 c->c_sasl_sockctx = NULL;
 407                 c->c_sasl_extra = NULL;
 408                 c->c_sasl_bindop = NULL;
 409
 410                 c->c_sb = ber_sockbuf_alloc( );
 411
 412                 {
 413                         ber_len_t max = sockbuf_max_incoming;
 414                         ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_SET_MAX_INCOMING, &max );
 415                 }
 416
 417                 c->c_currentber = NULL;
 418
 419                 /* should check status of thread calls */
 420                 ldap_pvt_thread_mutex_init( &c->c_mutex );
 421                 ldap_pvt_thread_mutex_init( &c->c_write1_mutex );
 422                 ldap_pvt_thread_mutex_init( &c->c_write2_mutex );
 423                 ldap_pvt_thread_cond_init( &c->c_write1_cv );
 424                 ldap_pvt_thread_cond_init( &c->c_write2_cv );
 425
 426 #ifdef LDAP_SLAPI
 427                 if ( slapi_plugins_used ) {
 428                         slapi_int_create_object_extensions( SLAPI_X_EXT_CONNECTION, c );
 429                 }
 430 #endif
 431         }
 432
 433         ldap_pvt_thread_mutex_lock( &c->c_mutex );
 434
 435         assert( BER_BVISNULL( &c->c_authmech ) );
 436         assert( BER_BVISNULL( &c->c_dn ) );
 437         assert( BER_BVISNULL( &c->c_ndn ) );
 438         assert( c->c_listener == NULL );
 439         assert( BER_BVISNULL( &c->c_peer_domain ) );
 440         assert( BER_BVISNULL( &c->c_peer_name ) );
 441         assert( LDAP_STAILQ_EMPTY(&c->c_ops) );
 442         assert( LDAP_STAILQ_EMPTY(&c->c_pending_ops) );
 443 #ifdef LDAP_X_TXN
 444         assert( c->c_txn == CONN_TXN_INACTIVE );
 445         assert( c->c_txn_backend == NULL );
 446         assert( LDAP_STAILQ_EMPTY(&c->c_txn_ops) );
 447 #endif
 448         assert( BER_BVISNULL( &c->c_sasl_bind_mech ) );
 449         assert( c->c_sasl_done == 0 );
 450         assert( c->c_sasl_authctx == NULL );
 451         assert( c->c_sasl_sockctx == NULL );
 452         assert( c->c_sasl_extra == NULL );
 453         assert( c->c_sasl_bindop == NULL );
 454         assert( c->c_currentber == NULL );
 455         assert( c->c_writewaiter == 0);
 456         assert( c->c_writers == 0);
 457
 458         c->c_listener = listener;
 459         c->c_sd = s;
 460
 461         if ( flags & CONN_IS_CLIENT ) {
 462                 c->c_connid = 0;
 463                 ldap_pvt_thread_mutex_lock( &connections_mutex );
 464                 c->c_conn_state = SLAP_C_CLIENT;
 465                 c->c_struct_state = SLAP_C_USED;
 466                 ldap_pvt_thread_mutex_unlock( &connections_mutex );
 467                 c->c_close_reason = "?";                        /* should never be needed */
 468                 ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_SET_FD, &sfd );
 469                 ldap_pvt_thread_mutex_unlock( &c->c_mutex );
 470
 471                 return c;
 472         }
 473
 474         ber_str2bv( dnsname, 0, 1, &c->c_peer_domain );
 475         ber_str2bv( peername, 0, 1, &c->c_peer_name );
 476
 477         c->c_n_ops_received = 0;
 478         c->c_n_ops_executing = 0;
 479         c->c_n_ops_pending = 0;
 480         c->c_n_ops_completed = 0;
 481
 482         c->c_n_get = 0;
 483         c->c_n_read = 0;
 484         c->c_n_write = 0;
 485
 486         /* set to zero until bind, implies LDAP_VERSION3 */
 487         c->c_protocol = 0;
 488
 489 #ifndef SLAPD_MONITOR
 490         if ( global_idletimeout > 0 )
 491 #endif /* ! SLAPD_MONITOR */
 492         {
 493                 c->c_activitytime = c->c_starttime = slap_get_time();
 494         }
 495
 496 #ifdef LDAP_CONNECTIONLESS
 497         c->c_is_udp = 0;
 498         if( flags & CONN_IS_UDP ) {
 499                 c->c_is_udp = 1;
 500 #ifdef LDAP_DEBUG
 501                 ber_sockbuf_add_io( c->c_sb, &ber_sockbuf_io_debug,
 502                         LBER_SBIOD_LEVEL_PROVIDER, (void*)"udp_" );
 503 #endif
 504                 ber_sockbuf_add_io( c->c_sb, &ber_sockbuf_io_udp,
 505                         LBER_SBIOD_LEVEL_PROVIDER, (void *)&sfd );
 506                 ber_sockbuf_add_io( c->c_sb, &ber_sockbuf_io_readahead,
 507                         LBER_SBIOD_LEVEL_PROVIDER, NULL );
 508         } else
 509 #endif /* LDAP_CONNECTIONLESS */
 510 #ifdef LDAP_PF_LOCAL
 511         if ( flags & CONN_IS_IPC ) {
 512 #ifdef LDAP_DEBUG
 513                 ber_sockbuf_add_io( c->c_sb, &ber_sockbuf_io_debug,
 514                         LBER_SBIOD_LEVEL_PROVIDER, (void*)"ipc_" );
 515 #endif
 516                 ber_sockbuf_add_io( c->c_sb, &ber_sockbuf_io_fd,
 517                         LBER_SBIOD_LEVEL_PROVIDER, (void *)&sfd );
 518 #ifdef LDAP_PF_LOCAL_SENDMSG
 519                 if ( !BER_BVISEMPTY( peerbv ))
 520                         ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_UNGET_BUF, peerbv );
 521 #endif
 522         } else
 523 #endif /* LDAP_PF_LOCAL */
 524         {
 525 #ifdef LDAP_DEBUG
 526                 ber_sockbuf_add_io( c->c_sb, &ber_sockbuf_io_debug,
 527                         LBER_SBIOD_LEVEL_PROVIDER, (void*)"tcp_" );
 528 #endif
 529                 ber_sockbuf_add_io( c->c_sb, &ber_sockbuf_io_tcp,
 530                         LBER_SBIOD_LEVEL_PROVIDER, (void *)&sfd );
 531         }
 532
 533 #ifdef LDAP_DEBUG
 534         ber_sockbuf_add_io( c->c_sb, &ber_sockbuf_io_debug,
 535                 INT_MAX, (void*)"ldap_" );
 536 #endif
 537
 538         if( ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_SET_NONBLOCK,
 539                 c /* non-NULL */ ) < 0 )
 540         {
 541                 Debug( LDAP_DEBUG_ANY,
 542                         "connection_init(%d, %s): set nonblocking failed\n",
 543                         s, c->c_peer_name.bv_val, 0 );
 544         }
 545
 546         ldap_pvt_thread_mutex_lock( &conn_nextid_mutex );
 547         id = c->c_connid = conn_nextid++;
 548         ldap_pvt_thread_mutex_unlock( &conn_nextid_mutex );
 549
 550         ldap_pvt_thread_mutex_lock( &connections_mutex );
 551         c->c_conn_state = SLAP_C_INACTIVE;
 552         c->c_struct_state = SLAP_C_USED;
 553         ldap_pvt_thread_mutex_unlock( &connections_mutex );
 554         c->c_close_reason = "?";                        /* should never be needed */
 555
 556         c->c_ssf = c->c_transport_ssf = ssf;
 557         c->c_tls_ssf = 0;
 558
 559 #ifdef HAVE_TLS
 560         if ( flags & CONN_IS_TLS ) {
 561                 c->c_is_tls = 1;
 562                 c->c_needs_tls_accept = 1;
 563         } else {
 564                 c->c_is_tls = 0;
 565                 c->c_needs_tls_accept = 0;
 566         }
 567 #endif
 568
 569         slap_sasl_open( c, 0 );
 570         slap_sasl_external( c, ssf, authid );
 571
 572         slapd_add_internal( s, 1 );
 573
 574         backend_connection_init(c);
 575         ldap_pvt_thread_mutex_unlock( &c->c_mutex );
 576
 577         return c;
 578 }
 579
 580 void connection2anonymous( Connection *c )
 581 {
 582         assert( connections != NULL );
 583         assert( c != NULL );
 584
 585         {
 586                 ber_len_t max = sockbuf_max_incoming;
 587                 ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_SET_MAX_INCOMING, &max );
 588         }
 589
 590         if ( !BER_BVISNULL( &c->c_authmech ) ) {
 591                 ch_free(c->c_authmech.bv_val);
 592         }
 593         BER_BVZERO( &c->c_authmech );
 594
 595         if ( !BER_BVISNULL( &c->c_dn ) ) {
 596                 ch_free(c->c_dn.bv_val);
 597         }
 598         BER_BVZERO( &c->c_dn );
 599
 600         if ( !BER_BVISNULL( &c->c_ndn ) ) {
 601                 ch_free(c->c_ndn.bv_val);
 602         }
 603         BER_BVZERO( &c->c_ndn );
 604
 605         if ( !BER_BVISNULL( &c->c_sasl_authz_dn ) ) {
 606                 ber_memfree_x( c->c_sasl_authz_dn.bv_val, NULL );
 607         }
 608         BER_BVZERO( &c->c_sasl_authz_dn );
 609
 610         c->c_authz_backend = NULL;
 611 }
 612
 613 static void
 614 connection_destroy( Connection *c )
 615 {
 616         unsigned long   connid;
 617         const char              *close_reason;
 618         Sockbuf                 *sb;
 619         ber_socket_t    sd;
 620
 621         assert( connections != NULL );
 622         assert( c != NULL );
 623         assert( c->c_struct_state != SLAP_C_UNUSED );
 624         assert( c->c_conn_state != SLAP_C_INVALID );
 625         assert( LDAP_STAILQ_EMPTY(&c->c_ops) );
 626         assert( LDAP_STAILQ_EMPTY(&c->c_pending_ops) );
 627 #ifdef LDAP_X_TXN
 628         assert( c->c_txn == CONN_TXN_INACTIVE );
 629         assert( c->c_txn_backend == NULL );
 630         assert( LDAP_STAILQ_EMPTY(&c->c_txn_ops) );
 631 #endif
 632         assert( c->c_writewaiter == 0);
 633         assert( c->c_writers == 0);
 634
 635         /* only for stats (print -1 as "%lu" may give unexpected results ;) */
 636         connid = c->c_connid;
 637         close_reason = c->c_close_reason;
 638
 639         ldap_pvt_thread_mutex_lock( &connections_mutex );
 640         c->c_struct_state = SLAP_C_PENDING;
 641         ldap_pvt_thread_mutex_unlock( &connections_mutex );
 642
 643         backend_connection_destroy(c);
 644
 645         c->c_protocol = 0;
 646         c->c_connid = -1;
 647
 648         c->c_activitytime = c->c_starttime = 0;
 649
 650         connection2anonymous( c );
 651         c->c_listener = NULL;
 652
 653         if(c->c_peer_domain.bv_val != NULL) {
 654                 free(c->c_peer_domain.bv_val);
 655         }
 656         BER_BVZERO( &c->c_peer_domain );
 657         if(c->c_peer_name.bv_val != NULL) {
 658                 free(c->c_peer_name.bv_val);
 659         }
 660         BER_BVZERO( &c->c_peer_name );
 661
 662         c->c_sasl_bind_in_progress = 0;
 663         if(c->c_sasl_bind_mech.bv_val != NULL) {
 664                 free(c->c_sasl_bind_mech.bv_val);
 665         }
 666         BER_BVZERO( &c->c_sasl_bind_mech );
 667
 668         slap_sasl_close( c );
 669
 670         if ( c->c_currentber != NULL ) {
 671                 ber_free( c->c_currentber, 1 );
 672                 c->c_currentber = NULL;
 673         }
 674
 675
 676 #ifdef LDAP_SLAPI
 677         /* call destructors, then constructors; avoids unnecessary allocation */
 678         if ( slapi_plugins_used ) {
 679                 slapi_int_clear_object_extensions( SLAPI_X_EXT_CONNECTION, c );
 680         }
 681 #endif
 682
 683         sd = c->c_sd;
 684         c->c_sd = AC_SOCKET_INVALID;
 685         c->c_conn_state = SLAP_C_INVALID;
 686         c->c_struct_state = SLAP_C_UNUSED;
 687         c->c_close_reason = "?";                        /* should never be needed */
 688
 689         sb = c->c_sb;
 690         c->c_sb = ber_sockbuf_alloc( );
 691         {
 692                 ber_len_t max = sockbuf_max_incoming;
 693                 ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_SET_MAX_INCOMING, &max );
 694         }
 695
 696         /* c must be fully reset by this point; when we call slapd_remove
 697          * it may get immediately reused by a new connection.
 698          */
 699         if ( sd != AC_SOCKET_INVALID ) {
 700                 slapd_remove( sd, sb, 1, 0, 0 );
 701
 702                 if ( close_reason == NULL ) {
 703                         Statslog( LDAP_DEBUG_STATS, "conn=%lu fd=%ld closed\n",
 704                                 connid, (long) sd, 0, 0, 0 );
 705                 } else {
 706                         Statslog( LDAP_DEBUG_STATS, "conn=%lu fd=%ld closed (%s)\n",
 707                                 connid, (long) sd, close_reason, 0, 0 );
 708                 }
 709         }
 710 }
 711
 712 int connection_valid( Connection *c )
 713 {
 714         /* c_mutex must be locked by caller */
 715
 716         assert( c != NULL );
 717
 718         return c->c_struct_state == SLAP_C_USED &&
 719                 c->c_conn_state >= SLAP_C_ACTIVE &&
 720                 c->c_conn_state <= SLAP_C_CLIENT;
 721 }
 722
 723 static void connection_abandon( Connection *c )
 724 {
 725         /* c_mutex must be locked by caller */
 726
 727         Operation *o, *next, op = {0};
 728         Opheader ohdr = {0};
 729
 730         op.o_hdr = &ohdr;
 731         op.o_conn = c;
 732         op.o_connid = c->c_connid;
 733         op.o_tag = LDAP_REQ_ABANDON;
 734
 735         for ( o = LDAP_STAILQ_FIRST( &c->c_ops ); o; o=next ) {
 736                 SlapReply rs = {REP_RESULT};
 737
 738                 next = LDAP_STAILQ_NEXT( o, o_next );
 739                 op.orn_msgid = o->o_msgid;
 740                 o->o_abandon = 1;
 741                 op.o_bd = frontendDB;
 742                 frontendDB->be_abandon( &op, &rs );
 743         }
 744
 745 #ifdef LDAP_X_TXN
 746         /* remove operations in pending transaction */
 747         while ( (o = LDAP_STAILQ_FIRST( &c->c_txn_ops )) != NULL) {
 748                 LDAP_STAILQ_REMOVE_HEAD( &c->c_txn_ops, o_next );
 749                 LDAP_STAILQ_NEXT(o, o_next) = NULL;
 750                 slap_op_free( o, NULL );
 751         }
 752
 753         /* clear transaction */
 754         c->c_txn_backend = NULL;
 755         c->c_txn = CONN_TXN_INACTIVE;
 756 #endif
 757
 758         /* remove pending operations */
 759         while ( (o = LDAP_STAILQ_FIRST( &c->c_pending_ops )) != NULL) {
 760                 LDAP_STAILQ_REMOVE_HEAD( &c->c_pending_ops, o_next );
 761                 LDAP_STAILQ_NEXT(o, o_next) = NULL;
 762                 slap_op_free( o, NULL );
 763         }
 764 }
 765
 766 static void
 767 connection_wake_writers( Connection *c )
 768 {
 769         /* wake write blocked operations */
 770         ldap_pvt_thread_mutex_lock( &c->c_write1_mutex );
 771         if ( c->c_writers > 0 ) {
 772                 c->c_writers = -c->c_writers;
 773                 ldap_pvt_thread_cond_broadcast( &c->c_write1_cv );
 774                 ldap_pvt_thread_mutex_unlock( &c->c_write1_mutex );
 775                 if ( c->c_writewaiter ) {
 776                         ldap_pvt_thread_mutex_lock( &c->c_write2_mutex );
 777                         ldap_pvt_thread_cond_signal( &c->c_write2_cv );
 778                         slapd_clr_write( c->c_sd, 1 );
 779                         ldap_pvt_thread_mutex_unlock( &c->c_write2_mutex );
 780                 }
 781                 ldap_pvt_thread_mutex_lock( &c->c_write1_mutex );
 782                 while ( c->c_writers ) {
 783                         ldap_pvt_thread_cond_wait( &c->c_write1_cv, &c->c_write1_mutex );
 784                 }
 785                 ldap_pvt_thread_mutex_unlock( &c->c_write1_mutex );
 786         } else {
 787                 ldap_pvt_thread_mutex_unlock( &c->c_write1_mutex );
 788                 slapd_clr_write( c->c_sd, 1 );
 789         }
 790 }
 791
 792 void connection_closing( Connection *c, const char *why )
 793 {
 794         assert( connections != NULL );
 795         assert( c != NULL );
 796
 797         if ( c->c_struct_state != SLAP_C_USED ) return;
 798
 799         assert( c->c_conn_state != SLAP_C_INVALID );
 800
 801         /* c_mutex must be locked by caller */
 802
 803         if( c->c_conn_state != SLAP_C_CLOSING ) {
 804                 Debug( LDAP_DEBUG_CONNS,
 805                         "connection_closing: readying conn=%lu sd=%d for close\n",
 806                         c->c_connid, c->c_sd, 0 );
 807                 /* update state to closing */
 808                 c->c_conn_state = SLAP_C_CLOSING;
 809                 c->c_close_reason = why;
 810
 811                 /* don't listen on this port anymore */
 812                 slapd_clr_read( c->c_sd, 0 );
 813
 814                 /* abandon active operations */
 815                 connection_abandon( c );
 816
 817                 /* wake write blocked operations */
 818                 connection_wake_writers( c );
 819
 820         } else if( why == NULL && c->c_close_reason == conn_lost_str ) {
 821                 /* Client closed connection after doing Unbind. */
 822                 c->c_close_reason = NULL;
 823         }
 824 }
 825
 826 static void
 827 connection_close( Connection *c )
 828 {
 829         assert( connections != NULL );
 830         assert( c != NULL );
 831
 832         if ( c->c_struct_state != SLAP_C_USED ) return;
 833
 834         assert( c->c_conn_state == SLAP_C_CLOSING );
 835
 836         /* NOTE: c_mutex should be locked by caller */
 837
 838         if ( !LDAP_STAILQ_EMPTY(&c->c_ops) ||
 839                 !LDAP_STAILQ_EMPTY(&c->c_pending_ops) )
 840         {
 841                 Debug( LDAP_DEBUG_CONNS,
 842                         "connection_close: deferring conn=%lu sd=%d\n",
 843                         c->c_connid, c->c_sd, 0 );
 844                 return;
 845         }
 846
 847         Debug( LDAP_DEBUG_TRACE, "connection_close: conn=%lu sd=%d\n",
 848                 c->c_connid, c->c_sd, 0 );
 849
 850         connection_destroy( c );
 851 }
 852
 853 unsigned long connections_nextid(void)
 854 {
 855         unsigned long id;
 856         assert( connections != NULL );
 857
 858         ldap_pvt_thread_mutex_lock( &conn_nextid_mutex );
 859
 860         id = conn_nextid;
 861
 862         ldap_pvt_thread_mutex_unlock( &conn_nextid_mutex );
 863
 864         return id;
 865 }
 866
 867 Connection* connection_first( ber_socket_t *index )
 868 {
 869         assert( connections != NULL );
 870         assert( index != NULL );
 871
 872         ldap_pvt_thread_mutex_lock( &connections_mutex );
 873         for( *index = 0; *index < dtblsize; (*index)++) {
 874                 if( connections[*index].c_struct_state != SLAP_C_UNINITIALIZED ) {
 875                         break;
 876                 }
 877         }
 878         ldap_pvt_thread_mutex_unlock( &connections_mutex );
 879
 880         return connection_next(NULL, index);
 881 }
 882
 883 Connection* connection_next( Connection *c, ber_socket_t *index )
 884 {
 885         assert( connections != NULL );
 886         assert( index != NULL );
 887         assert( *index <= dtblsize );
 888
 889         if( c != NULL ) ldap_pvt_thread_mutex_unlock( &c->c_mutex );
 890
 891         c = NULL;
 892
 893         ldap_pvt_thread_mutex_lock( &connections_mutex );
 894         for(; *index < dtblsize; (*index)++) {
 895                 int c_struct;
 896                 if( connections[*index].c_struct_state == SLAP_C_UNINITIALIZED ) {
 897                         /* FIXME: accessing c_conn_state without locking c_mutex */
 898                         assert( connections[*index].c_conn_state == SLAP_C_INVALID );
 899                         continue;
 900                 }
 901
 902                 if( connections[*index].c_struct_state == SLAP_C_USED ) {
 903                         c = &connections[(*index)++];
 904                         if ( ldap_pvt_thread_mutex_trylock( &c->c_mutex )) {
 905                                 /* avoid deadlock */
 906                                 ldap_pvt_thread_mutex_unlock( &connections_mutex );
 907                                 ldap_pvt_thread_mutex_lock( &c->c_mutex );
 908                                 ldap_pvt_thread_mutex_lock( &connections_mutex );
 909                                 if ( c->c_struct_state != SLAP_C_USED ) {
 910                                         ldap_pvt_thread_mutex_unlock( &c->c_mutex );
 911                                         c = NULL;
 912                                         continue;
 913                                 }
 914                         }
 915                         assert( c->c_conn_state != SLAP_C_INVALID );
 916                         break;
 917                 }
 918
 919                 c_struct = connections[*index].c_struct_state;
 920                 if ( c_struct == SLAP_C_PENDING )
 921                         continue;
 922                 assert( c_struct == SLAP_C_UNUSED );
 923                 /* FIXME: accessing c_conn_state without locking c_mutex */
 924                 assert( connections[*index].c_conn_state == SLAP_C_INVALID );
 925         }
 926
 927         ldap_pvt_thread_mutex_unlock( &connections_mutex );
 928         return c;
 929 }
 930
 931 void connection_done( Connection *c )
 932 {
 933         assert( connections != NULL );
 934
 935         if( c != NULL ) ldap_pvt_thread_mutex_unlock( &c->c_mutex );
 936 }
 937
 938 /*
 939  * connection_activity - handle the request operation op on connection
 940  * conn.  This routine figures out what kind of operation it is and
 941  * calls the appropriate stub to handle it.
 942  */
 943
 944 #ifdef SLAPD_MONITOR
 945 /* FIXME: returns 0 in case of failure */
 946 #define INCR_OP_INITIATED(index) \
 947         do { \
 948                 ldap_pvt_thread_mutex_lock( &op->o_counters->sc_mutex ); \
 949                 ldap_pvt_mp_add_ulong(op->o_counters->sc_ops_initiated_[(index)], 1); \
 950                 ldap_pvt_thread_mutex_unlock( &op->o_counters->sc_mutex ); \
 951         } while (0)
 952 #define INCR_OP_COMPLETED(index) \
 953         do { \
 954                 ldap_pvt_thread_mutex_lock( &op->o_counters->sc_mutex ); \
 955                 ldap_pvt_mp_add_ulong(op->o_counters->sc_ops_completed, 1); \
 956                 ldap_pvt_mp_add_ulong(op->o_counters->sc_ops_completed_[(index)], 1); \
 957                 ldap_pvt_thread_mutex_unlock( &op->o_counters->sc_mutex ); \
 958         } while (0)
 959 #else /* !SLAPD_MONITOR */
 960 #define INCR_OP_INITIATED(index) do { } while (0)
 961 #define INCR_OP_COMPLETED(index) \
 962         do { \
 963                 ldap_pvt_thread_mutex_lock( &op->o_counters->sc_mutex ); \
 964                 ldap_pvt_mp_add_ulong(op->o_counters->sc_ops_completed, 1); \
 965                 ldap_pvt_thread_mutex_unlock( &op->o_counters->sc_mutex ); \
 966         } while (0)
 967 #endif /* !SLAPD_MONITOR */
 968
 969 /*
 970  * NOTE: keep in sync with enum in slapd.h
 971  */
 972 static BI_op_func *opfun[] = {
 973         do_bind,
 974         do_unbind,
 975         do_search,
 976         do_compare,
 977         do_modify,
 978         do_modrdn,
 979         do_add,
 980         do_delete,
 981         do_abandon,
 982         do_extended,
 983         NULL
 984 };
 985
 986 /* Counters are per-thread, not per-connection.
 987  */
 988 static void
 989 conn_counter_destroy( void *key, void *data )
 990 {
 991         slap_counters_t **prev, *sc;
 992
 993         ldap_pvt_thread_mutex_lock( &slap_counters.sc_mutex );
 994         for ( prev = &slap_counters.sc_next, sc = slap_counters.sc_next; sc;
 995                 prev = &sc->sc_next, sc = sc->sc_next ) {
 996                 if ( sc == data ) {
 997                         int i;
 998
 999                         *prev = sc->sc_next;
1000                         /* Copy data to main counter */
1001                         ldap_pvt_mp_add( slap_counters.sc_bytes, sc->sc_bytes );
1002                         ldap_pvt_mp_add( slap_counters.sc_pdu, sc->sc_pdu );
1003                         ldap_pvt_mp_add( slap_counters.sc_entries, sc->sc_entries );
1004                         ldap_pvt_mp_add( slap_counters.sc_refs, sc->sc_refs );
1005                         ldap_pvt_mp_add( slap_counters.sc_ops_initiated, sc->sc_ops_initiated );
1006                         ldap_pvt_mp_add( slap_counters.sc_ops_completed, sc->sc_ops_completed );
1007 #ifdef SLAPD_MONITOR
1008                         for ( i = 0; i < SLAP_OP_LAST; i++ ) {
1009                                 ldap_pvt_mp_add( slap_counters.sc_ops_initiated_[ i ], sc->sc_ops_initiated_[ i ] );
1010                                 ldap_pvt_mp_add( slap_counters.sc_ops_initiated_[ i ], sc->sc_ops_completed_[ i ] );
1011                         }
1012 #endif /* SLAPD_MONITOR */
1013                         slap_counters_destroy( sc );
1014                         ber_memfree_x( data, NULL );
1015                         break;
1016                 }
1017         }
1018         ldap_pvt_thread_mutex_unlock( &slap_counters.sc_mutex );
1019 }
1020
1021 static void
1022 conn_counter_init( Operation *op, void *ctx )
1023 {
1024         slap_counters_t *sc;
1025         void *vsc = NULL;
1026
1027         if ( ldap_pvt_thread_pool_getkey(
1028                         ctx, (void *)conn_counter_init, &vsc, NULL ) || !vsc ) {
1029                 vsc = ch_malloc( sizeof( slap_counters_t ));
1030                 sc = vsc;
1031                 slap_counters_init( sc );
1032                 ldap_pvt_thread_pool_setkey( ctx, (void*)conn_counter_init, vsc,
1033                         conn_counter_destroy, NULL, NULL );
1034
1035                 ldap_pvt_thread_mutex_lock( &slap_counters.sc_mutex );
1036                 sc->sc_next = slap_counters.sc_next;
1037                 slap_counters.sc_next = sc;
1038                 ldap_pvt_thread_mutex_unlock( &slap_counters.sc_mutex );
1039         }
1040         op->o_counters = vsc;
1041 }
1042
1043 static void *
1044 connection_operation( void *ctx, void *arg_v )
1045 {
1046         int rc = LDAP_OTHER, cancel;
1047         Operation *op = arg_v;
1048         SlapReply rs = {REP_RESULT};
1049         ber_tag_t tag = op->o_tag;
1050         slap_op_t opidx = SLAP_OP_LAST;
1051         Connection *conn = op->o_conn;
1052         void *memctx = NULL;
1053         void *memctx_null = NULL;
1054         ber_len_t memsiz;
1055
1056         conn_counter_init( op, ctx );
1057         ldap_pvt_thread_mutex_lock( &op->o_counters->sc_mutex );
1058         /* FIXME: returns 0 in case of failure */
1059         ldap_pvt_mp_add_ulong(op->o_counters->sc_ops_initiated, 1);
1060         ldap_pvt_thread_mutex_unlock( &op->o_counters->sc_mutex );
1061
1062         op->o_threadctx = ctx;
1063         op->o_tid = ldap_pvt_thread_pool_tid( ctx );
1064
1065         switch ( tag ) {
1066         case LDAP_REQ_BIND:
1067         case LDAP_REQ_UNBIND:
1068         case LDAP_REQ_ADD:
1069         case LDAP_REQ_DELETE:
1070         case LDAP_REQ_MODDN:
1071         case LDAP_REQ_MODIFY:
1072         case LDAP_REQ_COMPARE:
1073         case LDAP_REQ_SEARCH:
1074         case LDAP_REQ_ABANDON:
1075         case LDAP_REQ_EXTENDED:
1076                 break;
1077         default:
1078                 Debug( LDAP_DEBUG_ANY, "connection_operation: "
1079                         "conn %lu unknown LDAP request 0x%lx\n",
1080                         conn->c_connid, tag, 0 );
1081                 op->o_tag = LBER_ERROR;
1082                 rs.sr_err = LDAP_PROTOCOL_ERROR;
1083                 rs.sr_text = "unknown LDAP request";
1084                 send_ldap_disconnect( op, &rs );
1085                 rc = SLAPD_DISCONNECT;
1086                 goto operations_error;
1087         }
1088
1089         if( conn->c_sasl_bind_in_progress && tag != LDAP_REQ_BIND ) {
1090                 Debug( LDAP_DEBUG_ANY, "connection_operation: "
1091                         "error: SASL bind in progress (tag=%ld).\n",
1092                         (long) tag, 0, 0 );
1093                 send_ldap_error( op, &rs, LDAP_OPERATIONS_ERROR,
1094                         "SASL bind in progress" );
1095                 rc = LDAP_OPERATIONS_ERROR;
1096                 goto operations_error;
1097         }
1098
1099 #ifdef LDAP_X_TXN
1100         if (( conn->c_txn == CONN_TXN_SPECIFY ) && (
1101                 ( tag == LDAP_REQ_ADD ) ||
1102                 ( tag == LDAP_REQ_DELETE ) ||
1103                 ( tag == LDAP_REQ_MODIFY ) ||
1104                 ( tag == LDAP_REQ_MODRDN )))
1105         {
1106                 /* Disable SLAB allocator for all update operations
1107                         issued inside of a transaction */
1108                 op->o_tmpmemctx = NULL;
1109                 op->o_tmpmfuncs = &ch_mfuncs;
1110         } else
1111 #endif
1112         {
1113         /* We can use Thread-Local storage for most mallocs. We can
1114          * also use TL for ber parsing, but not on Add or Modify.
1115          */
1116 #if 0
1117         memsiz = ber_len( op->o_ber ) * 64;
1118         if ( SLAP_SLAB_SIZE > memsiz ) memsiz = SLAP_SLAB_SIZE;
1119 #endif
1120         memsiz = SLAP_SLAB_SIZE;
1121
1122         memctx = slap_sl_mem_create( memsiz, SLAP_SLAB_STACK, ctx, 1 );
1123         op->o_tmpmemctx = memctx;
1124         op->o_tmpmfuncs = &slap_sl_mfuncs;
1125         if ( tag != LDAP_REQ_ADD && tag != LDAP_REQ_MODIFY ) {
1126                 /* Note - the ber and its buffer are already allocated from
1127                  * regular memory; this only affects subsequent mallocs that
1128                  * ber_scanf may invoke.
1129                  */
1130                 ber_set_option( op->o_ber, LBER_OPT_BER_MEMCTX, &memctx );
1131         }
1132         }
1133
1134         opidx = slap_req2op( tag );
1135         assert( opidx != SLAP_OP_LAST );
1136         INCR_OP_INITIATED( opidx );
1137         rc = (*(opfun[opidx]))( op, &rs );
1138
1139 operations_error:
1140         if ( rc == SLAPD_DISCONNECT ) {
1141                 tag = LBER_ERROR;
1142
1143         } else if ( opidx != SLAP_OP_LAST ) {
1144                 /* increment completed operations count
1145                  * only if operation was initiated
1146                  * and rc != SLAPD_DISCONNECT */
1147                 INCR_OP_COMPLETED( opidx );
1148         }
1149
1150         ldap_pvt_thread_mutex_lock( &conn->c_mutex );
1151
1152         if ( opidx == SLAP_OP_BIND && conn->c_conn_state == SLAP_C_BINDING )
1153                 conn->c_conn_state = SLAP_C_ACTIVE;
1154
1155         cancel = op->o_cancel;
1156         if ( cancel != SLAP_CANCEL_NONE && cancel != SLAP_CANCEL_DONE ) {
1157                 if ( cancel == SLAP_CANCEL_REQ ) {
1158                         op->o_cancel = rc == SLAPD_ABANDON
1159                                 ? SLAP_CANCEL_ACK : LDAP_TOO_LATE;
1160                 }
1161
1162                 do {
1163                         /* Fake a cond_wait with thread_yield, then
1164                          * verify the result properly mutex-protected.
1165                          */
1166                         ldap_pvt_thread_mutex_unlock( &conn->c_mutex );
1167                         do {
1168                                 ldap_pvt_thread_yield();
1169                         } while ( (cancel = op->o_cancel) != SLAP_CANCEL_NONE
1170                                         && cancel != SLAP_CANCEL_DONE );
1171                         ldap_pvt_thread_mutex_lock( &conn->c_mutex );
1172                 } while ( (cancel = op->o_cancel) != SLAP_CANCEL_NONE
1173                                 && cancel != SLAP_CANCEL_DONE );
1174         }
1175
1176         ber_set_option( op->o_ber, LBER_OPT_BER_MEMCTX, &memctx_null );
1177
1178         LDAP_STAILQ_REMOVE( &conn->c_ops, op, Operation, o_next);
1179         LDAP_STAILQ_NEXT(op, o_next) = NULL;
1180         conn->c_n_ops_executing--;
1181         conn->c_n_ops_completed++;
1182
1183         switch( tag ) {
1184         case LBER_ERROR:
1185         case LDAP_REQ_UNBIND:
1186                 /* c_mutex is locked */
1187                 connection_closing( conn,
1188                         tag == LDAP_REQ_UNBIND ? NULL : "operations error" );
1189                 break;
1190         }
1191
1192         connection_resched( conn );
1193         ldap_pvt_thread_mutex_unlock( &conn->c_mutex );
1194         slap_op_free( op, ctx );
1195         return NULL;
1196 }
1197
1198 static const Listener dummy_list = { BER_BVC(""), BER_BVC("") };
1199
1200 Connection *connection_client_setup(
1201         ber_socket_t s,
1202         ldap_pvt_thread_start_t *func,
1203         void *arg )
1204 {
1205         Connection *c;
1206         ber_socket_t sfd = SLAP_SOCKNEW( s );
1207
1208         c = connection_init( sfd, (Listener *)&dummy_list, "", "",
1209                 CONN_IS_CLIENT, 0, NULL
1210                 LDAP_PF_LOCAL_SENDMSG_ARG(NULL));
1211         if ( c ) {
1212                 c->c_clientfunc = func;
1213                 c->c_clientarg = arg;
1214
1215                 slapd_add_internal( sfd, 0 );
1216         }
1217         return c;
1218 }
1219
1220 void connection_client_enable(
1221         Connection *c )
1222 {
1223         slapd_set_read( c->c_sd, 1 );
1224 }
1225
1226 void connection_client_stop(
1227         Connection *c )
1228 {
1229         Sockbuf *sb;
1230         ber_socket_t s = c->c_sd;
1231
1232         /* get (locked) connection */
1233         c = connection_get( s );
1234
1235         assert( c->c_conn_state == SLAP_C_CLIENT );
1236
1237         c->c_listener = NULL;
1238         c->c_conn_state = SLAP_C_INVALID;
1239         c->c_struct_state = SLAP_C_UNUSED;
1240         c->c_sd = AC_SOCKET_INVALID;
1241         c->c_close_reason = "?";                        /* should never be needed */
1242         sb = c->c_sb;
1243         c->c_sb = ber_sockbuf_alloc( );
1244         {
1245                 ber_len_t max = sockbuf_max_incoming;
1246                 ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_SET_MAX_INCOMING, &max );
1247         }
1248         slapd_remove( s, sb, 0, 1, 0 );
1249
1250         connection_return( c );
1251 }
1252
1253 static int connection_read( ber_socket_t s, conn_readinfo *cri );
1254
1255 static void* connection_read_thread( void* ctx, void* argv )
1256 {
1257         int rc ;
1258         conn_readinfo cri = { NULL, NULL, NULL, NULL, 0 };
1259         ber_socket_t s = (long)argv;
1260
1261         /*
1262          * read incoming LDAP requests. If there is more than one,
1263          * the first one is returned with new_op
1264          */
1265         cri.ctx = ctx;
1266         if( ( rc = connection_read( s, &cri ) ) < 0 ) {
1267                 Debug( LDAP_DEBUG_CONNS, "connection_read(%d) error\n", s, 0, 0 );
1268                 return (void*)(long)rc;
1269         }
1270
1271         /* execute a single queued request in the same thread */
1272         if( cri.op && !cri.nullop ) {
1273                 rc = (long)connection_operation( ctx, cri.op );
1274         } else if ( cri.func ) {
1275                 rc = (long)cri.func( ctx, cri.arg );
1276         }
1277
1278         return (void*)(long)rc;
1279 }
1280
1281 int connection_read_activate( ber_socket_t s )
1282 {
1283         int rc;
1284
1285         /*
1286          * suspend reading on this file descriptor until a connection processing
1287          * thread reads data on it. Otherwise the listener thread will repeatedly
1288          * submit the same event on it to the pool.
1289          */
1290         rc = slapd_clr_read( s, 0 );
1291         if ( rc )
1292                 return rc;
1293
1294         /* Don't let blocked writers block a pause request */
1295         if ( connections[s].c_writewaiter &&
1296                 ldap_pvt_thread_pool_pausing( &connection_pool ))
1297                 connection_wake_writers( &connections[s] );
1298
1299         rc = ldap_pvt_thread_pool_submit( &connection_pool,
1300                 connection_read_thread, (void *)(long)s );
1301
1302         if( rc != 0 ) {
1303                 Debug( LDAP_DEBUG_ANY,
1304                         "connection_read_activate(%d): submit failed (%d)\n",
1305                         s, rc, 0 );
1306         }
1307
1308         return rc;
1309 }
1310
1311 static int
1312 connection_read( ber_socket_t s, conn_readinfo *cri )
1313 {
1314         int rc = 0;
1315         Connection *c;
1316
1317         assert( connections != NULL );
1318
1319         /* get (locked) connection */
1320         c = connection_get( s );
1321
1322         if( c == NULL ) {
1323                 Debug( LDAP_DEBUG_ANY,
1324                         "connection_read(%ld): no connection!\n",
1325                         (long) s, 0, 0 );
1326
1327                 return -1;
1328         }
1329
1330         c->c_n_read++;
1331
1332         if( c->c_conn_state == SLAP_C_CLOSING ) {
1333                 Debug( LDAP_DEBUG_CONNS,
1334                         "connection_read(%d): closing, ignoring input for id=%lu\n",
1335                         s, c->c_connid, 0 );
1336                 connection_return( c );
1337                 return 0;
1338         }
1339
1340         if ( c->c_conn_state == SLAP_C_CLIENT ) {
1341                 cri->func = c->c_clientfunc;
1342                 cri->arg = c->c_clientarg;
1343                 /* read should already be cleared */
1344                 connection_return( c );
1345                 return 0;
1346         }
1347
1348         Debug( LDAP_DEBUG_TRACE,
1349                 "connection_read(%d): checking for input on id=%lu\n",
1350                 s, c->c_connid, 0 );
1351
1352 #ifdef HAVE_TLS
1353         if ( c->c_is_tls && c->c_needs_tls_accept ) {
1354                 rc = ldap_pvt_tls_accept( c->c_sb, slap_tls_ctx );
1355                 if ( rc < 0 ) {
1356                         Debug( LDAP_DEBUG_TRACE,
1357                                 "connection_read(%d): TLS accept failure "
1358                                 "error=%d id=%lu, closing\n",
1359                                 s, rc, c->c_connid );
1360
1361                         c->c_needs_tls_accept = 0;
1362                         /* c_mutex is locked */
1363                         connection_closing( c, "TLS negotiation failure" );
1364                         connection_close( c );
1365                         connection_return( c );
1366                         return 0;
1367
1368                 } else if ( rc == 0 ) {
1369                         void *ssl;
1370                         struct berval authid = BER_BVNULL;
1371
1372                         c->c_needs_tls_accept = 0;
1373
1374                         /* we need to let SASL know */
1375                         ssl = ldap_pvt_tls_sb_ctx( c->c_sb );
1376
1377                         c->c_tls_ssf = (slap_ssf_t) ldap_pvt_tls_get_strength( ssl );
1378                         if( c->c_tls_ssf > c->c_ssf ) {
1379                                 c->c_ssf = c->c_tls_ssf;
1380                         }
1381
1382                         rc = dnX509peerNormalize( ssl, &authid );
1383                         if ( rc != LDAP_SUCCESS ) {
1384                                 Debug( LDAP_DEBUG_TRACE, "connection_read(%d): "
1385                                         "unable to get TLS client DN, error=%d id=%lu\n",
1386                                         s, rc, c->c_connid );
1387                         }
1388                         Statslog( LDAP_DEBUG_STATS,
1389                                 "conn=%lu fd=%d TLS established tls_ssf=%u ssf=%u\n",
1390                             c->c_connid, (int) s, c->c_tls_ssf, c->c_ssf, 0 );
1391                         slap_sasl_external( c, c->c_tls_ssf, &authid );
1392                         if ( authid.bv_val ) free( authid.bv_val );
1393                 } else if ( rc == 1 && ber_sockbuf_ctrl( c->c_sb,
1394                         LBER_SB_OPT_NEEDS_WRITE, NULL )) {      /* need to retry */
1395                         slapd_set_write( s, 1 );
1396                         connection_return( c );
1397                         return 0;
1398                 }
1399
1400                 /* if success and data is ready, fall thru to data input loop */
1401                 if( !ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_DATA_READY, NULL ) )
1402                 {
1403                         slapd_set_read( s, 1 );
1404                         connection_return( c );
1405                         return 0;
1406                 }
1407         }
1408 #endif
1409
1410 #ifdef HAVE_CYRUS_SASL
1411         if ( c->c_sasl_layers ) {
1412                 /* If previous layer is not removed yet, give up for now */
1413                 if ( !c->c_sasl_sockctx ) {
1414                         slapd_set_read( s, 1 );
1415                         connection_return( c );
1416                         return 0;
1417                 }
1418
1419                 c->c_sasl_layers = 0;
1420
1421                 rc = ldap_pvt_sasl_install( c->c_sb, c->c_sasl_sockctx );
1422                 if( rc != LDAP_SUCCESS ) {
1423                         Debug( LDAP_DEBUG_TRACE,
1424                                 "connection_read(%d): SASL install error "
1425                                 "error=%d id=%lu, closing\n",
1426                                 s, rc, c->c_connid );
1427
1428                         /* c_mutex is locked */
1429                         connection_closing( c, "SASL layer install failure" );
1430                         connection_close( c );
1431                         connection_return( c );
1432                         return 0;
1433                 }
1434         }
1435 #endif
1436
1437 #define CONNECTION_INPUT_LOOP 1
1438 /* #define      DATA_READY_LOOP 1 */
1439
1440         do {
1441                 /* How do we do this without getting into a busy loop ? */
1442                 rc = connection_input( c, cri );
1443         }
1444 #ifdef DATA_READY_LOOP
1445         while( !rc && ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_DATA_READY, NULL ));
1446 #elif defined CONNECTION_INPUT_LOOP
1447         while(!rc);
1448 #else
1449         while(0);
1450 #endif
1451
1452         if( rc < 0 ) {
1453                 Debug( LDAP_DEBUG_CONNS,
1454                         "connection_read(%d): input error=%d id=%lu, closing.\n",
1455                         s, rc, c->c_connid );
1456
1457                 /* c_mutex is locked */
1458                 connection_closing( c, conn_lost_str );
1459                 connection_close( c );
1460                 connection_return( c );
1461                 return 0;
1462         }
1463
1464         if ( ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_NEEDS_WRITE, NULL ) ) {
1465                 slapd_set_write( s, 0 );
1466         }
1467
1468         slapd_set_read( s, 1 );
1469         connection_return( c );
1470
1471         return 0;
1472 }
1473
1474 static int
1475 connection_input( Connection *conn , conn_readinfo *cri )
1476 {
1477         Operation *op;
1478         ber_tag_t       tag;
1479         ber_len_t       len;
1480         ber_int_t       msgid;
1481         BerElement      *ber;
1482         int             rc;
1483 #ifdef LDAP_CONNECTIONLESS
1484         Sockaddr        peeraddr;
1485         char            *cdn = NULL;
1486 #endif
1487         char *defer = NULL;
1488         void *ctx;
1489
1490         if ( conn->c_currentber == NULL &&
1491                 ( conn->c_currentber = ber_alloc()) == NULL )
1492         {
1493                 Debug( LDAP_DEBUG_ANY, "ber_alloc failed\n", 0, 0, 0 );
1494                 return -1;
1495         }
1496
1497         sock_errset(0);
1498
1499 #ifdef LDAP_CONNECTIONLESS
1500         if ( conn->c_is_udp ) {
1501                 char peername[sizeof("IP=255.255.255.255:65336")];
1502                 const char *peeraddr_string = NULL;
1503
1504                 len = ber_int_sb_read(conn->c_sb, &peeraddr, sizeof(struct sockaddr));
1505                 if (len != sizeof(struct sockaddr)) return 1;
1506
1507 #if defined( HAVE_GETADDRINFO ) && defined( HAVE_INET_NTOP )
1508                 char addr[INET_ADDRSTRLEN];
1509                 peeraddr_string = inet_ntop( AF_INET, &peeraddr.sa_in_addr.sin_addr,
1510                            addr, sizeof(addr) );
1511 #else /* ! HAVE_GETADDRINFO || ! HAVE_INET_NTOP */
1512                 peeraddr_string = inet_ntoa( peeraddr.sa_in_addr.sin_addr );
1513 #endif /* ! HAVE_GETADDRINFO || ! HAVE_INET_NTOP */
1514                 sprintf( peername, "IP=%s:%d",
1515                          peeraddr_string,
1516                         (unsigned) ntohs( peeraddr.sa_in_addr.sin_port ) );
1517                 Statslog( LDAP_DEBUG_STATS,
1518                         "conn=%lu UDP request from %s (%s) accepted.\n",
1519                         conn->c_connid, peername, conn->c_sock_name.bv_val, 0, 0 );
1520         }
1521 #endif
1522
1523         tag = ber_get_next( conn->c_sb, &len, conn->c_currentber );
1524         if ( tag != LDAP_TAG_MESSAGE ) {
1525                 int err = sock_errno();
1526
1527                 if ( err != EWOULDBLOCK && err != EAGAIN ) {
1528                         /* log, close and send error */
1529                         Debug( LDAP_DEBUG_TRACE,
1530                                 "ber_get_next on fd %d failed errno=%d (%s)\n",
1531                         conn->c_sd, err, sock_errstr(err) );
1532                         ber_free( conn->c_currentber, 1 );
1533                         conn->c_currentber = NULL;
1534
1535                         return -2;
1536                 }
1537                 return 1;
1538         }
1539
1540         ber = conn->c_currentber;
1541         conn->c_currentber = NULL;
1542
1543         if ( (tag = ber_get_int( ber, &msgid )) != LDAP_TAG_MSGID ) {
1544                 /* log, close and send error */
1545                 Debug( LDAP_DEBUG_ANY, "ber_get_int returns 0x%lx\n", tag, 0, 0 );
1546                 ber_free( ber, 1 );
1547                 return -1;
1548         }
1549
1550         if ( (tag = ber_peek_tag( ber, &len )) == LBER_ERROR ) {
1551                 /* log, close and send error */
1552                 Debug( LDAP_DEBUG_ANY, "ber_peek_tag returns 0x%lx\n", tag, 0, 0 );
1553                 ber_free( ber, 1 );
1554
1555                 return -1;
1556         }
1557
1558 #ifdef LDAP_CONNECTIONLESS
1559         if( conn->c_is_udp ) {
1560                 if( tag == LBER_OCTETSTRING ) {
1561                         if ( (tag = ber_get_stringa( ber, &cdn )) != LBER_ERROR )
1562                                 tag = ber_peek_tag( ber, &len );
1563                 }
1564                 if( tag != LDAP_REQ_ABANDON && tag != LDAP_REQ_SEARCH ) {
1565                         Debug( LDAP_DEBUG_ANY, "invalid req for UDP 0x%lx\n", tag, 0, 0 );
1566                         ber_free( ber, 1 );
1567                         return 0;
1568                 }
1569         }
1570 #endif
1571
1572         if(tag == LDAP_REQ_BIND) {
1573                 /* immediately abandon all existing operations upon BIND */
1574                 connection_abandon( conn );
1575         }
1576
1577         ctx = cri->ctx;
1578         op = slap_op_alloc( ber, msgid, tag, conn->c_n_ops_received++, ctx );
1579
1580         Debug( LDAP_DEBUG_TRACE, "op tag 0x%lx, time %ld\n", tag,
1581                 (long) op->o_time, 0);
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                 /*
1672                  * The first op will be processed in the same thread context,
1673                  * as long as there is only one op total.
1674                  * Subsequent ops will be submitted to the pool by
1675                  * calling connection_op_activate()
1676                  */
1677                 if ( cri->op == NULL ) {
1678                         /* the first incoming request */
1679                         connection_op_queue( op );
1680                         cri->op = op;
1681                 } else {
1682                         if ( !cri->nullop ) {
1683                                 cri->nullop = 1;
1684                                 rc = ldap_pvt_thread_pool_submit( &connection_pool,
1685                                         connection_operation, (void *) cri->op );
1686                         }
1687                         connection_op_activate( op );
1688                 }
1689         }
1690
1691 #ifdef NO_THREADS
1692         if ( conn->c_struct_state != SLAP_C_USED ) {
1693                 /* connection must have got closed underneath us */
1694                 return 1;
1695         }
1696 #endif
1697
1698         assert( conn->c_struct_state == SLAP_C_USED );
1699         return rc;
1700 }
1701
1702 static int
1703 connection_resched( Connection *conn )
1704 {
1705         Operation *op;
1706
1707         if( conn->c_writewaiter )
1708                 return 0;
1709
1710         if( conn->c_conn_state == SLAP_C_CLOSING ) {
1711                 Debug( LDAP_DEBUG_CONNS, "connection_resched: "
1712                         "attempting closing conn=%lu sd=%d\n",
1713                         conn->c_connid, conn->c_sd, 0 );
1714                 connection_close( conn );
1715                 return 0;
1716         }
1717
1718         if( conn->c_conn_state != SLAP_C_ACTIVE ) {
1719                 /* other states need different handling */
1720                 return 0;
1721         }
1722
1723         while ((op = LDAP_STAILQ_FIRST( &conn->c_pending_ops )) != NULL) {
1724                 if ( conn->c_n_ops_executing > connection_pool_max/2 ) break;
1725
1726                 LDAP_STAILQ_REMOVE_HEAD( &conn->c_pending_ops, o_next );
1727                 LDAP_STAILQ_NEXT(op, o_next) = NULL;
1728
1729                 /* pending operations should not be marked for abandonment */
1730                 assert(!op->o_abandon);
1731
1732                 conn->c_n_ops_pending--;
1733                 conn->c_n_ops_executing++;
1734
1735                 connection_op_activate( op );
1736
1737                 if ( conn->c_conn_state == SLAP_C_BINDING ) break;
1738         }
1739         return 0;
1740 }
1741
1742 static void
1743 connection_init_log_prefix( Operation *op )
1744 {
1745         if ( op->o_connid == (unsigned long)(-1) ) {
1746                 snprintf( op->o_log_prefix, sizeof( op->o_log_prefix ),
1747                         "conn=-1 op=%lu", op->o_opid );
1748
1749         } else {
1750                 snprintf( op->o_log_prefix, sizeof( op->o_log_prefix ),
1751                         "conn=%lu op=%lu", op->o_connid, op->o_opid );
1752         }
1753 }
1754
1755 static int connection_bind_cleanup_cb( Operation *op, SlapReply *rs )
1756 {
1757         op->o_conn->c_sasl_bindop = NULL;
1758
1759         ch_free( op->o_callback );
1760         op->o_callback = NULL;
1761
1762         return SLAP_CB_CONTINUE;
1763 }
1764
1765 static int connection_bind_cb( Operation *op, SlapReply *rs )
1766 {
1767         ldap_pvt_thread_mutex_lock( &op->o_conn->c_mutex );
1768         op->o_conn->c_sasl_bind_in_progress =
1769                 ( rs->sr_err == LDAP_SASL_BIND_IN_PROGRESS );
1770
1771         /* Moved here from bind.c due to ITS#4158 */
1772         op->o_conn->c_sasl_bindop = NULL;
1773         if ( op->orb_method == LDAP_AUTH_SASL ) {
1774                 if( rs->sr_err == LDAP_SUCCESS ) {
1775                         ber_dupbv(&op->o_conn->c_dn, &op->orb_edn);
1776                         if( !BER_BVISEMPTY( &op->orb_edn ) ) {
1777                                 /* edn is always normalized already */
1778                                 ber_dupbv( &op->o_conn->c_ndn, &op->o_conn->c_dn );
1779                         }
1780                         op->o_tmpfree( op->orb_edn.bv_val, op->o_tmpmemctx );
1781                         BER_BVZERO( &op->orb_edn );
1782                         op->o_conn->c_authmech = op->o_conn->c_sasl_bind_mech;
1783                         BER_BVZERO( &op->o_conn->c_sasl_bind_mech );
1784
1785                         op->o_conn->c_sasl_ssf = op->orb_ssf;
1786                         if( op->orb_ssf > op->o_conn->c_ssf ) {
1787                                 op->o_conn->c_ssf = op->orb_ssf;
1788                         }
1789
1790                         if( !BER_BVISEMPTY( &op->o_conn->c_dn ) ) {
1791                                 ber_len_t max = sockbuf_max_incoming_auth;
1792                                 ber_sockbuf_ctrl( op->o_conn->c_sb,
1793                                         LBER_SB_OPT_SET_MAX_INCOMING, &max );
1794                         }
1795
1796                         /* log authorization identity */
1797                         Statslog( LDAP_DEBUG_STATS,
1798                                 "%s BIND dn=\"%s\" mech=%s sasl_ssf=%d ssf=%d\n",
1799                                 op->o_log_prefix,
1800                                 BER_BVISNULL( &op->o_conn->c_dn ) ? "<empty>" : op->o_conn->c_dn.bv_val,
1801                                 op->o_conn->c_authmech.bv_val,
1802                                 op->orb_ssf, op->o_conn->c_ssf );
1803
1804                         Debug( LDAP_DEBUG_TRACE,
1805                                 "do_bind: SASL/%s bind: dn=\"%s\" sasl_ssf=%d\n",
1806                                 op->o_conn->c_authmech.bv_val,
1807                                 BER_BVISNULL( &op->o_conn->c_dn ) ? "<empty>" : op->o_conn->c_dn.bv_val,
1808                                 op->orb_ssf );
1809
1810                 } else if ( rs->sr_err != LDAP_SASL_BIND_IN_PROGRESS ) {
1811                         if ( !BER_BVISNULL( &op->o_conn->c_sasl_bind_mech ) ) {
1812                                 free( op->o_conn->c_sasl_bind_mech.bv_val );
1813                                 BER_BVZERO( &op->o_conn->c_sasl_bind_mech );
1814                         }
1815                 }
1816         }
1817         ldap_pvt_thread_mutex_unlock( &op->o_conn->c_mutex );
1818
1819         ch_free( op->o_callback );
1820         op->o_callback = NULL;
1821
1822         return SLAP_CB_CONTINUE;
1823 }
1824
1825 static void connection_op_queue( Operation *op )
1826 {
1827         ber_tag_t tag = op->o_tag;
1828
1829         if (tag == LDAP_REQ_BIND) {
1830                 slap_callback *sc = ch_calloc( 1, sizeof( slap_callback ));
1831                 sc->sc_response = connection_bind_cb;
1832                 sc->sc_cleanup = connection_bind_cleanup_cb;
1833                 sc->sc_next = op->o_callback;
1834                 op->o_callback = sc;
1835                 op->o_conn->c_conn_state = SLAP_C_BINDING;
1836         }
1837
1838         if (!op->o_dn.bv_len) {
1839                 op->o_authz = op->o_conn->c_authz;
1840                 if ( BER_BVISNULL( &op->o_conn->c_sasl_authz_dn )) {
1841                         ber_dupbv( &op->o_dn, &op->o_conn->c_dn );
1842                         ber_dupbv( &op->o_ndn, &op->o_conn->c_ndn );
1843                 } else {
1844                         ber_dupbv( &op->o_dn, &op->o_conn->c_sasl_authz_dn );
1845                         ber_dupbv( &op->o_ndn, &op->o_conn->c_sasl_authz_dn );
1846                 }
1847         }
1848
1849         op->o_authtype = op->o_conn->c_authtype;
1850         ber_dupbv( &op->o_authmech, &op->o_conn->c_authmech );
1851
1852         if (!op->o_protocol) {
1853                 op->o_protocol = op->o_conn->c_protocol
1854                         ? op->o_conn->c_protocol : LDAP_VERSION3;
1855         }
1856
1857         if (op->o_conn->c_conn_state == SLAP_C_INACTIVE &&
1858                 op->o_protocol > LDAP_VERSION2)
1859         {
1860                 op->o_conn->c_conn_state = SLAP_C_ACTIVE;
1861         }
1862
1863         op->o_connid = op->o_conn->c_connid;
1864         connection_init_log_prefix( op );
1865
1866         LDAP_STAILQ_INSERT_TAIL( &op->o_conn->c_ops, op, o_next );
1867 }
1868
1869 static int connection_op_activate( Operation *op )
1870 {
1871         int rc;
1872
1873         connection_op_queue( op );
1874
1875         rc = ldap_pvt_thread_pool_submit( &connection_pool,
1876                 connection_operation, (void *) op );
1877
1878         if ( rc != 0 ) {
1879                 Debug( LDAP_DEBUG_ANY,
1880                         "connection_op_activate: submit failed (%d) for conn=%lu\n",
1881                         rc, op->o_connid, 0 );
1882                 /* should move op to pending list */
1883         }
1884
1885         return rc;
1886 }
1887
1888 int connection_write(ber_socket_t s)
1889 {
1890         Connection *c;
1891         Operation *op;
1892
1893         assert( connections != NULL );
1894
1895         slapd_clr_write( s, 0 );
1896
1897         c = connection_get( s );
1898         if( c == NULL ) {
1899                 Debug( LDAP_DEBUG_ANY,
1900                         "connection_write(%ld): no connection!\n",
1901                         (long)s, 0, 0 );
1902                 return -1;
1903         }
1904
1905 #ifdef HAVE_TLS
1906         if ( c->c_is_tls && c->c_needs_tls_accept ) {
1907                 connection_return( c );
1908                 connection_read_activate( s );
1909                 return 0;
1910         }
1911 #endif
1912
1913         c->c_n_write++;
1914
1915         Debug( LDAP_DEBUG_TRACE,
1916                 "connection_write(%d): waking output for id=%lu\n",
1917                 s, c->c_connid, 0 );
1918         ldap_pvt_thread_mutex_lock( &c->c_write2_mutex );
1919         ldap_pvt_thread_cond_signal( &c->c_write2_cv );
1920         ldap_pvt_thread_mutex_unlock( &c->c_write2_mutex );
1921
1922         if ( ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_NEEDS_READ, NULL ) ) {
1923                 slapd_set_read( s, 1 );
1924         }
1925         if ( ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_NEEDS_WRITE, NULL ) ) {
1926                 slapd_set_write( s, 1 );
1927         }
1928
1929         /* If there are ops pending because of a writewaiter,
1930          * start one up.
1931          */
1932         while ((op = LDAP_STAILQ_FIRST( &c->c_pending_ops )) != NULL) {
1933                 if ( !c->c_writewaiter ) break;
1934                 if ( c->c_n_ops_executing > connection_pool_max/2 ) break;
1935
1936                 LDAP_STAILQ_REMOVE_HEAD( &c->c_pending_ops, o_next );
1937                 LDAP_STAILQ_NEXT(op, o_next) = NULL;
1938
1939                 /* pending operations should not be marked for abandonment */
1940                 assert(!op->o_abandon);
1941
1942                 c->c_n_ops_pending--;
1943                 c->c_n_ops_executing++;
1944
1945                 connection_op_activate( op );
1946
1947                 break;
1948         }
1949
1950         connection_return( c );
1951         return 0;
1952 }
1953
1954 #ifdef LDAP_SLAPI
1955 typedef struct conn_fake_extblock {
1956         void *eb_conn;
1957         void *eb_op;
1958 } conn_fake_extblock;
1959
1960 static void
1961 connection_fake_destroy(
1962         void *key,
1963         void *data )
1964 {
1965         Connection conn = {0};
1966         Operation op = {0};
1967         Opheader ohdr = {0};
1968
1969         conn_fake_extblock *eb = data;
1970
1971         op.o_hdr = &ohdr;
1972         op.o_hdr->oh_extensions = eb->eb_op;
1973         conn.c_extensions = eb->eb_conn;
1974         op.o_conn = &conn;
1975         conn.c_connid = -1;
1976         op.o_connid = -1;
1977
1978         ber_memfree_x( eb, NULL );
1979         slapi_int_free_object_extensions( SLAPI_X_EXT_OPERATION, &op );
1980         slapi_int_free_object_extensions( SLAPI_X_EXT_CONNECTION, &conn );
1981 }
1982 #endif
1983
1984 void
1985 connection_fake_init(
1986         Connection *conn,
1987         OperationBuffer *opbuf,
1988         void *ctx )
1989 {
1990         connection_fake_init2( conn, opbuf, ctx, 1 );
1991 }
1992
1993 void
1994 operation_fake_init(
1995         Connection *conn,
1996         Operation *op,
1997         void *ctx,
1998         int newmem )
1999 {
2000         /* set memory context */
2001         op->o_tmpmemctx = slap_sl_mem_create(SLAP_SLAB_SIZE, SLAP_SLAB_STACK, ctx,
2002                 newmem );
2003         op->o_tmpmfuncs = &slap_sl_mfuncs;
2004         op->o_threadctx = ctx;
2005         op->o_tid = ldap_pvt_thread_pool_tid( ctx );
2006
2007         op->o_counters = &slap_counters;
2008         op->o_conn = conn;
2009         op->o_connid = op->o_conn->c_connid;
2010         connection_init_log_prefix( op );
2011 }
2012
2013
2014 void
2015 connection_fake_init2(
2016         Connection *conn,
2017         OperationBuffer *opbuf,
2018         void *ctx,
2019         int newmem )
2020 {
2021         Operation *op = (Operation *) opbuf;
2022
2023         conn->c_connid = -1;
2024         conn->c_conn_idx = -1;
2025         conn->c_send_ldap_result = slap_send_ldap_result;
2026         conn->c_send_search_entry = slap_send_search_entry;
2027         conn->c_send_search_reference = slap_send_search_reference;
2028         conn->c_send_ldap_extended = slap_send_ldap_extended;
2029         conn->c_send_ldap_intermediate = slap_send_ldap_intermediate;
2030         conn->c_listener = (Listener *)&dummy_list;
2031         conn->c_peer_domain = slap_empty_bv;
2032         conn->c_peer_name = slap_empty_bv;
2033
2034         memset( opbuf, 0, sizeof( *opbuf ));
2035         op->o_hdr = &opbuf->ob_hdr;
2036         op->o_controls = opbuf->ob_controls;
2037
2038         operation_fake_init( conn, op, ctx, newmem );
2039
2040 #ifdef LDAP_SLAPI
2041         if ( slapi_plugins_used ) {
2042                 conn_fake_extblock *eb;
2043                 void *ebx = NULL;
2044
2045                 /* Use thread keys to make sure these eventually get cleaned up */
2046                 if ( ldap_pvt_thread_pool_getkey( ctx, (void *)connection_fake_init,
2047                                 &ebx, NULL )) {
2048                         eb = ch_malloc( sizeof( *eb ));
2049                         slapi_int_create_object_extensions( SLAPI_X_EXT_CONNECTION, conn );
2050                         slapi_int_create_object_extensions( SLAPI_X_EXT_OPERATION, op );
2051                         eb->eb_conn = conn->c_extensions;
2052                         eb->eb_op = op->o_hdr->oh_extensions;
2053                         ldap_pvt_thread_pool_setkey( ctx, (void *)connection_fake_init,
2054                                 eb, connection_fake_destroy, NULL, NULL );
2055                 } else {
2056                         eb = ebx;
2057                         conn->c_extensions = eb->eb_conn;
2058                         op->o_hdr->oh_extensions = eb->eb_op;
2059                 }
2060         }
2061 #endif /* LDAP_SLAPI */
2062
2063         slap_op_time( &op->o_time, &op->o_tincr );
2064 }
2065
2066 void
2067 connection_assign_nextid( Connection *conn )
2068 {
2069         ldap_pvt_thread_mutex_lock( &conn_nextid_mutex );
2070         conn->c_connid = conn_nextid++;
2071         ldap_pvt_thread_mutex_unlock( &conn_nextid_mutex );
2072 }