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 1998-2009 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 enum sc_struct_state {
  57         SLAP_C_UNINITIALIZED = 0,       /* MUST BE ZERO (0) */
  58         SLAP_C_UNUSED,
  59         SLAP_C_USED,
  60         SLAP_C_PENDING
  61 };
  62
  63 /* connection state (protected by c_mutex ) */
  64 enum sc_conn_state {
  65         SLAP_C_INVALID = 0,             /* MUST BE ZERO (0) */
  66         SLAP_C_INACTIVE,                /* zero threads */
  67         SLAP_C_CLOSING,                 /* closing */
  68         SLAP_C_ACTIVE,                  /* one or more threads */
  69         SLAP_C_BINDING,                 /* binding */
  70         SLAP_C_CLIENT                   /* outbound client conn */
  71 };
  72
  73 const char *
  74 connection_state2str( int state )
  75 {
  76         switch( state ) {
  77         case SLAP_C_INVALID:    return "!";
  78         case SLAP_C_INACTIVE:   return "|";
  79         case SLAP_C_CLOSING:    return "C";
  80         case SLAP_C_ACTIVE:             return "";
  81         case SLAP_C_BINDING:    return "B";
  82         case SLAP_C_CLIENT:             return "L";
  83         }
  84
  85         return "?";
  86 }
  87
  88 static Connection* connection_get( ber_socket_t s );
  89
  90 typedef struct conn_readinfo {
  91         Operation *op;
  92         ldap_pvt_thread_start_t *func;
  93         void *arg;
  94         void *ctx;
  95         int nullop;
  96 } conn_readinfo;
  97
  98 static int connection_input( Connection *c, conn_readinfo *cri );
  99 static void connection_close( Connection *c );
 100
 101 static int connection_op_activate( Operation *op );
 102 static void connection_op_queue( Operation *op );
 103 static int connection_resched( Connection *conn );
 104 static void connection_abandon( Connection *conn );
 105 static void connection_destroy( Connection *c );
 106
 107 static ldap_pvt_thread_start_t connection_operation;
 108
 109 /*
 110  * Initialize connection management infrastructure.
 111  */
 112 int connections_init(void)
 113 {
 114         int i;
 115
 116         assert( connections == NULL );
 117
 118         if( connections != NULL) {
 119                 Debug( LDAP_DEBUG_ANY, "connections_init: already initialized.\n",
 120                         0, 0, 0 );
 121                 return -1;
 122         }
 123
 124         /* should check return of every call */
 125         ldap_pvt_thread_mutex_init( &connections_mutex );
 126         ldap_pvt_thread_mutex_init( &conn_nextid_mutex );
 127
 128         connections = (Connection *) ch_calloc( dtblsize, sizeof(Connection) );
 129
 130         if( connections == NULL ) {
 131                 Debug( LDAP_DEBUG_ANY, "connections_init: "
 132                         "allocation (%d*%ld) of connection array failed\n",
 133                         dtblsize, (long) sizeof(Connection), 0 );
 134                 return -1;
 135         }
 136
 137         assert( connections[0].c_struct_state == SLAP_C_UNINITIALIZED );
 138         assert( connections[dtblsize-1].c_struct_state == SLAP_C_UNINITIALIZED );
 139
 140         for (i=0; i<dtblsize; i++) connections[i].c_conn_idx = i;
 141
 142         /*
 143          * per entry initialization of the Connection array initialization
 144          * will be done by connection_init()
 145          */
 146
 147         return 0;
 148 }
 149
 150 /*
 151  * Destroy connection management infrastructure.
 152  */
 153
 154 int connections_destroy(void)
 155 {
 156         ber_socket_t i;
 157
 158         /* should check return of every call */
 159
 160         if( connections == NULL) {
 161                 Debug( LDAP_DEBUG_ANY, "connections_destroy: nothing to destroy.\n",
 162                         0, 0, 0 );
 163                 return -1;
 164         }
 165
 166         for ( i = 0; i < dtblsize; i++ ) {
 167                 if( connections[i].c_struct_state != SLAP_C_UNINITIALIZED ) {
 168                         ber_sockbuf_free( connections[i].c_sb );
 169                         ldap_pvt_thread_mutex_destroy( &connections[i].c_mutex );
 170                         ldap_pvt_thread_mutex_destroy( &connections[i].c_write1_mutex );
 171                         ldap_pvt_thread_mutex_destroy( &connections[i].c_write2_mutex );
 172                         ldap_pvt_thread_cond_destroy( &connections[i].c_write1_cv );
 173                         ldap_pvt_thread_cond_destroy( &connections[i].c_write2_cv );
 174 #ifdef LDAP_SLAPI
 175                         if ( slapi_plugins_used ) {
 176                                 slapi_int_free_object_extensions( SLAPI_X_EXT_CONNECTION,
 177                                         &connections[i] );
 178                         }
 179 #endif
 180                 }
 181         }
 182
 183         free( connections );
 184         connections = NULL;
 185
 186         ldap_pvt_thread_mutex_destroy( &connections_mutex );
 187         ldap_pvt_thread_mutex_destroy( &conn_nextid_mutex );
 188         return 0;
 189 }
 190
 191 /*
 192  * shutdown all connections
 193  */
 194 int connections_shutdown(void)
 195 {
 196         ber_socket_t i;
 197
 198         for ( i = 0; i < dtblsize; i++ ) {
 199                 if( connections[i].c_struct_state != SLAP_C_UNINITIALIZED ) {
 200                         ldap_pvt_thread_mutex_lock( &connections[i].c_mutex );
 201                         if( connections[i].c_struct_state == SLAP_C_USED ) {
 202
 203                                 /* give persistent clients a chance to cleanup */
 204                                 if( connections[i].c_conn_state == SLAP_C_CLIENT ) {
 205                                         ldap_pvt_thread_pool_submit( &connection_pool,
 206                                         connections[i].c_clientfunc, connections[i].c_clientarg );
 207                                 } else {
 208                                         /* c_mutex is locked */
 209                                         connection_closing( &connections[i], "slapd shutdown" );
 210                                         connection_close( &connections[i] );
 211                                 }
 212                         }
 213                         ldap_pvt_thread_mutex_unlock( &connections[i].c_mutex );
 214                 }
 215         }
 216
 217         return 0;
 218 }
 219
 220 /*
 221  * Timeout idle connections.
 222  */
 223 int connections_timeout_idle(time_t now)
 224 {
 225         int i = 0, writers = 0;
 226         int connindex;
 227         Connection* c;
 228         time_t old;
 229
 230         old = slapd_get_writetime();
 231
 232         for( c = connection_first( &connindex );
 233                 c != NULL;
 234                 c = connection_next( c, &connindex ) )
 235         {
 236                 /* Don't timeout a slow-running request or a persistent
 237                  * outbound connection. But if it has a writewaiter, see
 238                  * if the waiter has been there too long.
 239                  */
 240                 if(( c->c_n_ops_executing && !c->c_writewaiter)
 241                         || c->c_conn_state == SLAP_C_CLIENT ) {
 242                         continue;
 243                 }
 244
 245                 if( difftime( c->c_activitytime+global_idletimeout, now) < 0 ) {
 246                         /* close it */
 247                         connection_closing( c, "idletimeout" );
 248                         connection_close( c );
 249                         i++;
 250                         continue;
 251                 }
 252                 if ( c->c_writewaiter ) {
 253                         writers = 1;
 254                         if( difftime( c->c_activitytime+global_writetimeout, now) < 0 ) {
 255                                 /* close it */
 256                                 connection_closing( c, "writetimeout" );
 257                                 connection_close( c );
 258                                 i++;
 259                         }
 260                 }
 261         }
 262         connection_done( c );
 263         if ( !writers )
 264                 slapd_clr_writetime( old );
 265
 266         return i;
 267 }
 268
 269 static Connection* connection_get( ber_socket_t s )
 270 {
 271         Connection *c;
 272
 273         Debug( LDAP_DEBUG_ARGS,
 274                 "connection_get(%ld)\n",
 275                 (long) s, 0, 0 );
 276
 277         assert( connections != NULL );
 278
 279         if(s == AC_SOCKET_INVALID) return NULL;
 280
 281         assert( s < dtblsize );
 282         c = &connections[s];
 283
 284         if( c != NULL ) {
 285                 ldap_pvt_thread_mutex_lock( &c->c_mutex );
 286
 287                 assert( c->c_struct_state != SLAP_C_UNINITIALIZED );
 288
 289                 if( c->c_struct_state != SLAP_C_USED ) {
 290                         /* connection must have been closed due to resched */
 291
 292                         assert( c->c_conn_state == SLAP_C_INVALID );
 293                         assert( c->c_sd == AC_SOCKET_INVALID );
 294
 295                         Debug( LDAP_DEBUG_CONNS,
 296                                 "connection_get(%d): connection not used\n",
 297                                 s, 0, 0 );
 298
 299                         ldap_pvt_thread_mutex_unlock( &c->c_mutex );
 300                         return NULL;
 301                 }
 302
 303                 Debug( LDAP_DEBUG_TRACE,
 304                         "connection_get(%d): got connid=%lu\n",
 305                         s, c->c_connid, 0 );
 306
 307                 c->c_n_get++;
 308
 309                 assert( c->c_struct_state == SLAP_C_USED );
 310                 assert( c->c_conn_state != SLAP_C_INVALID );
 311                 assert( c->c_sd != AC_SOCKET_INVALID );
 312
 313 #ifndef SLAPD_MONITOR
 314                 if ( global_idletimeout > 0 )
 315 #endif /* ! SLAPD_MONITOR */
 316                 {
 317                         c->c_activitytime = slap_get_time();
 318                 }
 319         }
 320
 321         return c;
 322 }
 323
 324 static void connection_return( Connection *c )
 325 {
 326         ldap_pvt_thread_mutex_unlock( &c->c_mutex );
 327 }
 328
 329 Connection * connection_init(
 330         ber_socket_t s,
 331         Listener *listener,
 332         const char* dnsname,
 333         const char* peername,
 334         int flags,
 335         slap_ssf_t ssf,
 336         struct berval *authid
 337         LDAP_PF_LOCAL_SENDMSG_ARG(struct berval *peerbv))
 338 {
 339         unsigned long id;
 340         Connection *c;
 341         int doinit = 0;
 342         ber_socket_t sfd = SLAP_FD2SOCK(s);
 343
 344         assert( connections != NULL );
 345
 346         assert( listener != NULL );
 347         assert( dnsname != NULL );
 348         assert( peername != NULL );
 349
 350 #ifndef HAVE_TLS
 351         assert( !( flags & CONN_IS_TLS ));
 352 #endif
 353
 354         if( s == AC_SOCKET_INVALID ) {
 355                 Debug( LDAP_DEBUG_ANY,
 356                         "connection_init: init of socket %ld invalid.\n", (long)s, 0, 0 );
 357                 return NULL;
 358         }
 359
 360         assert( s >= 0 );
 361         assert( s < dtblsize );
 362         c = &connections[s];
 363         if( c->c_struct_state == SLAP_C_UNINITIALIZED ) {
 364                 doinit = 1;
 365         } else {
 366                 assert( c->c_struct_state == SLAP_C_UNUSED );
 367         }
 368
 369         if( doinit ) {
 370                 c->c_send_ldap_result = slap_send_ldap_result;
 371                 c->c_send_search_entry = slap_send_search_entry;
 372                 c->c_send_search_reference = slap_send_search_reference;
 373                 c->c_send_ldap_extended = slap_send_ldap_extended;
 374                 c->c_send_ldap_intermediate = slap_send_ldap_intermediate;
 375
 376                 BER_BVZERO( &c->c_authmech );
 377                 BER_BVZERO( &c->c_dn );
 378                 BER_BVZERO( &c->c_ndn );
 379
 380                 c->c_listener = NULL;
 381                 BER_BVZERO( &c->c_peer_domain );
 382                 BER_BVZERO( &c->c_peer_name );
 383
 384                 LDAP_STAILQ_INIT(&c->c_ops);
 385                 LDAP_STAILQ_INIT(&c->c_pending_ops);
 386
 387 #ifdef LDAP_X_TXN
 388                 c->c_txn = CONN_TXN_INACTIVE;
 389                 c->c_txn_backend = NULL;
 390                 LDAP_STAILQ_INIT(&c->c_txn_ops);
 391 #endif
 392
 393                 BER_BVZERO( &c->c_sasl_bind_mech );
 394                 c->c_sasl_done = 0;
 395                 c->c_sasl_authctx = NULL;
 396                 c->c_sasl_sockctx = NULL;
 397                 c->c_sasl_extra = NULL;
 398                 c->c_sasl_bindop = NULL;
 399
 400                 c->c_sb = ber_sockbuf_alloc( );
 401
 402                 {
 403                         ber_len_t max = sockbuf_max_incoming;
 404                         ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_SET_MAX_INCOMING, &max );
 405                 }
 406
 407                 c->c_currentber = NULL;
 408
 409                 /* should check status of thread calls */
 410                 ldap_pvt_thread_mutex_init( &c->c_mutex );
 411                 ldap_pvt_thread_mutex_init( &c->c_write1_mutex );
 412                 ldap_pvt_thread_mutex_init( &c->c_write2_mutex );
 413                 ldap_pvt_thread_cond_init( &c->c_write1_cv );
 414                 ldap_pvt_thread_cond_init( &c->c_write2_cv );
 415
 416 #ifdef LDAP_SLAPI
 417                 if ( slapi_plugins_used ) {
 418                         slapi_int_create_object_extensions( SLAPI_X_EXT_CONNECTION, c );
 419                 }
 420 #endif
 421         }
 422
 423         ldap_pvt_thread_mutex_lock( &c->c_mutex );
 424
 425         assert( BER_BVISNULL( &c->c_authmech ) );
 426         assert( BER_BVISNULL( &c->c_dn ) );
 427         assert( BER_BVISNULL( &c->c_ndn ) );
 428         assert( c->c_listener == NULL );
 429         assert( BER_BVISNULL( &c->c_peer_domain ) );
 430         assert( BER_BVISNULL( &c->c_peer_name ) );
 431         assert( LDAP_STAILQ_EMPTY(&c->c_ops) );
 432         assert( LDAP_STAILQ_EMPTY(&c->c_pending_ops) );
 433 #ifdef LDAP_X_TXN
 434         assert( c->c_txn == CONN_TXN_INACTIVE );
 435         assert( c->c_txn_backend == NULL );
 436         assert( LDAP_STAILQ_EMPTY(&c->c_txn_ops) );
 437 #endif
 438         assert( BER_BVISNULL( &c->c_sasl_bind_mech ) );
 439         assert( c->c_sasl_done == 0 );
 440         assert( c->c_sasl_authctx == NULL );
 441         assert( c->c_sasl_sockctx == NULL );
 442         assert( c->c_sasl_extra == NULL );
 443         assert( c->c_sasl_bindop == NULL );
 444         assert( c->c_currentber == NULL );
 445         assert( c->c_writewaiter == 0);
 446         assert( c->c_writers == 0);
 447
 448         c->c_listener = listener;
 449         c->c_sd = s;
 450
 451         if ( flags & CONN_IS_CLIENT ) {
 452                 c->c_connid = 0;
 453                 ldap_pvt_thread_mutex_lock( &connections_mutex );
 454                 c->c_conn_state = SLAP_C_CLIENT;
 455                 c->c_struct_state = SLAP_C_USED;
 456                 ldap_pvt_thread_mutex_unlock( &connections_mutex );
 457                 c->c_close_reason = "?";                        /* should never be needed */
 458                 ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_SET_FD, &sfd );
 459                 ldap_pvt_thread_mutex_unlock( &c->c_mutex );
 460
 461                 return c;
 462         }
 463
 464         ber_str2bv( dnsname, 0, 1, &c->c_peer_domain );
 465         ber_str2bv( peername, 0, 1, &c->c_peer_name );
 466
 467         c->c_n_ops_received = 0;
 468         c->c_n_ops_executing = 0;
 469         c->c_n_ops_pending = 0;
 470         c->c_n_ops_completed = 0;
 471
 472         c->c_n_get = 0;
 473         c->c_n_read = 0;
 474         c->c_n_write = 0;
 475
 476         /* set to zero until bind, implies LDAP_VERSION3 */
 477         c->c_protocol = 0;
 478
 479 #ifndef SLAPD_MONITOR
 480         if ( global_idletimeout > 0 )
 481 #endif /* ! SLAPD_MONITOR */
 482         {
 483                 c->c_activitytime = c->c_starttime = slap_get_time();
 484         }
 485
 486 #ifdef LDAP_CONNECTIONLESS
 487         c->c_is_udp = 0;
 488         if( flags & CONN_IS_UDP ) {
 489                 c->c_is_udp = 1;
 490 #ifdef LDAP_DEBUG
 491                 ber_sockbuf_add_io( c->c_sb, &ber_sockbuf_io_debug,
 492                         LBER_SBIOD_LEVEL_PROVIDER, (void*)"udp_" );
 493 #endif
 494                 ber_sockbuf_add_io( c->c_sb, &ber_sockbuf_io_udp,
 495                         LBER_SBIOD_LEVEL_PROVIDER, (void *)&sfd );
 496                 ber_sockbuf_add_io( c->c_sb, &ber_sockbuf_io_readahead,
 497                         LBER_SBIOD_LEVEL_PROVIDER, NULL );
 498         } else
 499 #endif /* LDAP_CONNECTIONLESS */
 500 #ifdef LDAP_PF_LOCAL
 501         if ( flags & CONN_IS_IPC ) {
 502 #ifdef LDAP_DEBUG
 503                 ber_sockbuf_add_io( c->c_sb, &ber_sockbuf_io_debug,
 504                         LBER_SBIOD_LEVEL_PROVIDER, (void*)"ipc_" );
 505 #endif
 506                 ber_sockbuf_add_io( c->c_sb, &ber_sockbuf_io_fd,
 507                         LBER_SBIOD_LEVEL_PROVIDER, (void *)&sfd );
 508 #ifdef LDAP_PF_LOCAL_SENDMSG
 509                 if ( !BER_BVISEMPTY( peerbv ))
 510                         ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_UNGET_BUF, peerbv );
 511 #endif
 512         } else
 513 #endif /* LDAP_PF_LOCAL */
 514         {
 515 #ifdef LDAP_DEBUG
 516                 ber_sockbuf_add_io( c->c_sb, &ber_sockbuf_io_debug,
 517                         LBER_SBIOD_LEVEL_PROVIDER, (void*)"tcp_" );
 518 #endif
 519                 ber_sockbuf_add_io( c->c_sb, &ber_sockbuf_io_tcp,
 520                         LBER_SBIOD_LEVEL_PROVIDER, (void *)&sfd );
 521         }
 522
 523 #ifdef LDAP_DEBUG
 524         ber_sockbuf_add_io( c->c_sb, &ber_sockbuf_io_debug,
 525                 INT_MAX, (void*)"ldap_" );
 526 #endif
 527
 528         if( ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_SET_NONBLOCK,
 529                 c /* non-NULL */ ) < 0 )
 530         {
 531                 Debug( LDAP_DEBUG_ANY,
 532                         "connection_init(%d, %s): set nonblocking failed\n",
 533                         s, c->c_peer_name.bv_val, 0 );
 534         }
 535
 536         ldap_pvt_thread_mutex_lock( &conn_nextid_mutex );
 537         id = c->c_connid = conn_nextid++;
 538         ldap_pvt_thread_mutex_unlock( &conn_nextid_mutex );
 539
 540         ldap_pvt_thread_mutex_lock( &connections_mutex );
 541         c->c_conn_state = SLAP_C_INACTIVE;
 542         c->c_struct_state = SLAP_C_USED;
 543         ldap_pvt_thread_mutex_unlock( &connections_mutex );
 544         c->c_close_reason = "?";                        /* should never be needed */
 545
 546         c->c_ssf = c->c_transport_ssf = ssf;
 547         c->c_tls_ssf = 0;
 548
 549 #ifdef HAVE_TLS
 550         if ( flags & CONN_IS_TLS ) {
 551                 c->c_is_tls = 1;
 552                 c->c_needs_tls_accept = 1;
 553         } else {
 554                 c->c_is_tls = 0;
 555                 c->c_needs_tls_accept = 0;
 556         }
 557 #endif
 558
 559         slap_sasl_open( c, 0 );
 560         slap_sasl_external( c, ssf, authid );
 561
 562         slapd_add_internal( s, 1 );
 563         ldap_pvt_thread_mutex_unlock( &c->c_mutex );
 564
 565         backend_connection_init(c);
 566
 567         return c;
 568 }
 569
 570 void connection2anonymous( Connection *c )
 571 {
 572         assert( connections != NULL );
 573         assert( c != NULL );
 574
 575         {
 576                 ber_len_t max = sockbuf_max_incoming;
 577                 ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_SET_MAX_INCOMING, &max );
 578         }
 579
 580         if ( !BER_BVISNULL( &c->c_authmech ) ) {
 581                 ch_free(c->c_authmech.bv_val);
 582         }
 583         BER_BVZERO( &c->c_authmech );
 584
 585         if ( !BER_BVISNULL( &c->c_dn ) ) {
 586                 ch_free(c->c_dn.bv_val);
 587         }
 588         BER_BVZERO( &c->c_dn );
 589
 590         if ( !BER_BVISNULL( &c->c_ndn ) ) {
 591                 ch_free(c->c_ndn.bv_val);
 592         }
 593         BER_BVZERO( &c->c_ndn );
 594
 595         if ( !BER_BVISNULL( &c->c_sasl_authz_dn ) ) {
 596                 ber_memfree_x( c->c_sasl_authz_dn.bv_val, NULL );
 597         }
 598         BER_BVZERO( &c->c_sasl_authz_dn );
 599
 600         c->c_authz_backend = NULL;
 601 }
 602
 603 static void
 604 connection_destroy( Connection *c )
 605 {
 606         unsigned long   connid;
 607         const char              *close_reason;
 608         Sockbuf                 *sb;
 609         ber_socket_t    sd;
 610
 611         assert( connections != NULL );
 612         assert( c != NULL );
 613         assert( c->c_struct_state != SLAP_C_UNUSED );
 614         assert( c->c_conn_state != SLAP_C_INVALID );
 615         assert( LDAP_STAILQ_EMPTY(&c->c_ops) );
 616         assert( LDAP_STAILQ_EMPTY(&c->c_pending_ops) );
 617 #ifdef LDAP_X_TXN
 618         assert( c->c_txn == CONN_TXN_INACTIVE );
 619         assert( c->c_txn_backend == NULL );
 620         assert( LDAP_STAILQ_EMPTY(&c->c_txn_ops) );
 621 #endif
 622         assert( c->c_writewaiter == 0);
 623         assert( c->c_writers == 0);
 624
 625         /* only for stats (print -1 as "%lu" may give unexpected results ;) */
 626         connid = c->c_connid;
 627         close_reason = c->c_close_reason;
 628
 629         ldap_pvt_thread_mutex_lock( &connections_mutex );
 630         c->c_struct_state = SLAP_C_PENDING;
 631         ldap_pvt_thread_mutex_unlock( &connections_mutex );
 632
 633         backend_connection_destroy(c);
 634
 635         c->c_protocol = 0;
 636         c->c_connid = -1;
 637
 638         c->c_activitytime = c->c_starttime = 0;
 639
 640         connection2anonymous( c );
 641         c->c_listener = NULL;
 642
 643         if(c->c_peer_domain.bv_val != NULL) {
 644                 free(c->c_peer_domain.bv_val);
 645         }
 646         BER_BVZERO( &c->c_peer_domain );
 647         if(c->c_peer_name.bv_val != NULL) {
 648                 free(c->c_peer_name.bv_val);
 649         }
 650         BER_BVZERO( &c->c_peer_name );
 651
 652         c->c_sasl_bind_in_progress = 0;
 653         if(c->c_sasl_bind_mech.bv_val != NULL) {
 654                 free(c->c_sasl_bind_mech.bv_val);
 655         }
 656         BER_BVZERO( &c->c_sasl_bind_mech );
 657
 658         slap_sasl_close( c );
 659
 660         if ( c->c_currentber != NULL ) {
 661                 ber_free( c->c_currentber, 1 );
 662                 c->c_currentber = NULL;
 663         }
 664
 665
 666 #ifdef LDAP_SLAPI
 667         /* call destructors, then constructors; avoids unnecessary allocation */
 668         if ( slapi_plugins_used ) {
 669                 slapi_int_clear_object_extensions( SLAPI_X_EXT_CONNECTION, c );
 670         }
 671 #endif
 672
 673         sd = c->c_sd;
 674         c->c_sd = AC_SOCKET_INVALID;
 675         c->c_conn_state = SLAP_C_INVALID;
 676         c->c_struct_state = SLAP_C_UNUSED;
 677         c->c_close_reason = "?";                        /* should never be needed */
 678
 679         sb = c->c_sb;
 680         c->c_sb = ber_sockbuf_alloc( );
 681         {
 682                 ber_len_t max = sockbuf_max_incoming;
 683                 ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_SET_MAX_INCOMING, &max );
 684         }
 685
 686         /* c must be fully reset by this point; when we call slapd_remove
 687          * it may get immediately reused by a new connection.
 688          */
 689         if ( sd != AC_SOCKET_INVALID ) {
 690                 slapd_remove( sd, sb, 1, 0, 0 );
 691
 692                 if ( close_reason == NULL ) {
 693                         Statslog( LDAP_DEBUG_STATS, "conn=%lu fd=%ld closed\n",
 694                                 connid, (long) sd, 0, 0, 0 );
 695                 } else {
 696                         Statslog( LDAP_DEBUG_STATS, "conn=%lu fd=%ld closed (%s)\n",
 697                                 connid, (long) sd, close_reason, 0, 0 );
 698                 }
 699         }
 700 }
 701
 702 int connection_valid( Connection *c )
 703 {
 704         /* c_mutex must be locked by caller */
 705
 706         assert( c != NULL );
 707
 708         return c->c_struct_state == SLAP_C_USED &&
 709                 c->c_conn_state >= SLAP_C_ACTIVE &&
 710                 c->c_conn_state <= SLAP_C_CLIENT;
 711 }
 712
 713 static void connection_abandon( Connection *c )
 714 {
 715         /* c_mutex must be locked by caller */
 716
 717         Operation *o, *next, op = {0};
 718         Opheader ohdr = {0};
 719         SlapReply rs = {0};
 720
 721         op.o_hdr = &ohdr;
 722         op.o_conn = c;
 723         op.o_connid = c->c_connid;
 724         op.o_tag = LDAP_REQ_ABANDON;
 725
 726         for ( o = LDAP_STAILQ_FIRST( &c->c_ops ); o; o=next ) {
 727                 next = LDAP_STAILQ_NEXT( o, o_next );
 728                 op.orn_msgid = o->o_msgid;
 729                 o->o_abandon = 1;
 730                 op.o_bd = frontendDB;
 731                 frontendDB->be_abandon( &op, &rs );
 732         }
 733
 734 #ifdef LDAP_X_TXN
 735         /* remove operations in pending transaction */
 736         while ( (o = LDAP_STAILQ_FIRST( &c->c_txn_ops )) != NULL) {
 737                 LDAP_STAILQ_REMOVE_HEAD( &c->c_txn_ops, o_next );
 738                 LDAP_STAILQ_NEXT(o, o_next) = NULL;
 739                 slap_op_free( o, NULL );
 740         }
 741
 742         /* clear transaction */
 743         c->c_txn_backend = NULL;
 744         c->c_txn = CONN_TXN_INACTIVE;
 745 #endif
 746
 747         /* remove pending operations */
 748         while ( (o = LDAP_STAILQ_FIRST( &c->c_pending_ops )) != NULL) {
 749                 LDAP_STAILQ_REMOVE_HEAD( &c->c_pending_ops, o_next );
 750                 LDAP_STAILQ_NEXT(o, o_next) = NULL;
 751                 slap_op_free( o, NULL );
 752         }
 753 }
 754
 755 void connection_closing( Connection *c, const char *why )
 756 {
 757         assert( connections != NULL );
 758         assert( c != NULL );
 759         assert( c->c_struct_state == SLAP_C_USED );
 760         assert( c->c_conn_state != SLAP_C_INVALID );
 761
 762         /* c_mutex must be locked by caller */
 763
 764         if( c->c_conn_state != SLAP_C_CLOSING ) {
 765                 Debug( LDAP_DEBUG_CONNS,
 766                         "connection_closing: readying conn=%lu sd=%d for close\n",
 767                         c->c_connid, c->c_sd, 0 );
 768                 /* update state to closing */
 769                 c->c_conn_state = SLAP_C_CLOSING;
 770                 c->c_close_reason = why;
 771
 772                 /* don't listen on this port anymore */
 773                 slapd_clr_read( c->c_sd, 0 );
 774
 775                 /* abandon active operations */
 776                 connection_abandon( c );
 777
 778                 /* wake write blocked operations */
 779                 ldap_pvt_thread_mutex_lock( &c->c_write1_mutex );
 780                 if ( c->c_writers > 0 ) {
 781                         c->c_writers = -c->c_writers;
 782                         ldap_pvt_thread_cond_broadcast( &c->c_write1_cv );
 783                         ldap_pvt_thread_mutex_unlock( &c->c_write1_mutex );
 784                         if ( c->c_writewaiter ) {
 785                                 ldap_pvt_thread_mutex_lock( &c->c_write2_mutex );
 786                                 ldap_pvt_thread_cond_signal( &c->c_write2_cv );
 787                                 slapd_clr_write( c->c_sd, 1 );
 788                                 ldap_pvt_thread_mutex_unlock( &c->c_write2_mutex );
 789                         }
 790                         ldap_pvt_thread_mutex_lock( &c->c_write1_mutex );
 791                         while ( c->c_writers ) {
 792                                 ldap_pvt_thread_cond_wait( &c->c_write1_cv, &c->c_write1_mutex );
 793                         }
 794                         ldap_pvt_thread_mutex_unlock( &c->c_write1_mutex );
 795                 } else {
 796                         ldap_pvt_thread_mutex_unlock( &c->c_write1_mutex );
 797                         slapd_clr_write( c->c_sd, 1 );
 798                 }
 799
 800         } else if( why == NULL && c->c_close_reason == conn_lost_str ) {
 801                 /* Client closed connection after doing Unbind. */
 802                 c->c_close_reason = NULL;
 803         }
 804 }
 805
 806 static void
 807 connection_close( Connection *c )
 808 {
 809         assert( connections != NULL );
 810         assert( c != NULL );
 811         assert( c->c_struct_state == SLAP_C_USED );
 812         assert( c->c_conn_state == SLAP_C_CLOSING );
 813
 814         /* NOTE: c_mutex should be locked by caller */
 815
 816         if ( !LDAP_STAILQ_EMPTY(&c->c_ops) ||
 817                 !LDAP_STAILQ_EMPTY(&c->c_pending_ops) )
 818         {
 819                 Debug( LDAP_DEBUG_CONNS,
 820                         "connection_close: deferring conn=%lu sd=%d\n",
 821                         c->c_connid, c->c_sd, 0 );
 822                 return;
 823         }
 824
 825         Debug( LDAP_DEBUG_TRACE, "connection_close: conn=%lu sd=%d\n",
 826                 c->c_connid, c->c_sd, 0 );
 827
 828         connection_destroy( c );
 829 }
 830
 831 unsigned long connections_nextid(void)
 832 {
 833         unsigned long id;
 834         assert( connections != NULL );
 835
 836         ldap_pvt_thread_mutex_lock( &conn_nextid_mutex );
 837
 838         id = conn_nextid;
 839
 840         ldap_pvt_thread_mutex_unlock( &conn_nextid_mutex );
 841
 842         return id;
 843 }
 844
 845 Connection* connection_first( ber_socket_t *index )
 846 {
 847         assert( connections != NULL );
 848         assert( index != NULL );
 849
 850         ldap_pvt_thread_mutex_lock( &connections_mutex );
 851         for( *index = 0; *index < dtblsize; (*index)++) {
 852                 if( connections[*index].c_struct_state != SLAP_C_UNINITIALIZED ) {
 853                         break;
 854                 }
 855         }
 856         ldap_pvt_thread_mutex_unlock( &connections_mutex );
 857
 858         return connection_next(NULL, index);
 859 }
 860
 861 Connection* connection_next( Connection *c, ber_socket_t *index )
 862 {
 863         assert( connections != NULL );
 864         assert( index != NULL );
 865         assert( *index <= dtblsize );
 866
 867         if( c != NULL ) ldap_pvt_thread_mutex_unlock( &c->c_mutex );
 868
 869         c = NULL;
 870
 871         ldap_pvt_thread_mutex_lock( &connections_mutex );
 872         for(; *index < dtblsize; (*index)++) {
 873                 int c_struct;
 874                 if( connections[*index].c_struct_state == SLAP_C_UNINITIALIZED ) {
 875                         /* FIXME: accessing c_conn_state without locking c_mutex */
 876                         assert( connections[*index].c_conn_state == SLAP_C_INVALID );
 877                         continue;
 878                 }
 879
 880                 if( connections[*index].c_struct_state == SLAP_C_USED ) {
 881                         c = &connections[(*index)++];
 882                         if ( ldap_pvt_thread_mutex_trylock( &c->c_mutex )) {
 883                                 /* avoid deadlock */
 884                                 ldap_pvt_thread_mutex_unlock( &connections_mutex );
 885                                 ldap_pvt_thread_mutex_lock( &c->c_mutex );
 886                                 ldap_pvt_thread_mutex_lock( &connections_mutex );
 887                                 if ( c->c_struct_state != SLAP_C_USED ) {
 888                                         ldap_pvt_thread_mutex_unlock( &c->c_mutex );
 889                                         c = NULL;
 890                                         continue;
 891                                 }
 892                         }
 893                         assert( c->c_conn_state != SLAP_C_INVALID );
 894                         break;
 895                 }
 896
 897                 c_struct = connections[*index].c_struct_state;
 898                 if ( c_struct == SLAP_C_PENDING )
 899                         continue;
 900                 assert( c_struct == SLAP_C_UNUSED );
 901                 /* FIXME: accessing c_conn_state without locking c_mutex */
 902                 assert( connections[*index].c_conn_state == SLAP_C_INVALID );
 903         }
 904
 905         ldap_pvt_thread_mutex_unlock( &connections_mutex );
 906         return c;
 907 }
 908
 909 void connection_done( Connection *c )
 910 {
 911         assert( connections != NULL );
 912
 913         if( c != NULL ) ldap_pvt_thread_mutex_unlock( &c->c_mutex );
 914 }
 915
 916 /*
 917  * connection_activity - handle the request operation op on connection
 918  * conn.  This routine figures out what kind of operation it is and
 919  * calls the appropriate stub to handle it.
 920  */
 921
 922 #ifdef SLAPD_MONITOR
 923 /* FIXME: returns 0 in case of failure */
 924 #define INCR_OP_INITIATED(index) \
 925         do { \
 926                 ldap_pvt_thread_mutex_lock( &op->o_counters->sc_mutex ); \
 927                 ldap_pvt_mp_add_ulong(op->o_counters->sc_ops_initiated_[(index)], 1); \
 928                 ldap_pvt_thread_mutex_unlock( &op->o_counters->sc_mutex ); \
 929         } while (0)
 930 #define INCR_OP_COMPLETED(index) \
 931         do { \
 932                 ldap_pvt_thread_mutex_lock( &op->o_counters->sc_mutex ); \
 933                 ldap_pvt_mp_add_ulong(op->o_counters->sc_ops_completed, 1); \
 934                 ldap_pvt_mp_add_ulong(op->o_counters->sc_ops_completed_[(index)], 1); \
 935                 ldap_pvt_thread_mutex_unlock( &op->o_counters->sc_mutex ); \
 936         } while (0)
 937 #else /* !SLAPD_MONITOR */
 938 #define INCR_OP_INITIATED(index) do { } while (0)
 939 #define INCR_OP_COMPLETED(index) \
 940         do { \
 941                 ldap_pvt_thread_mutex_lock( &op->o_counters->sc_mutex ); \
 942                 ldap_pvt_mp_add_ulong(op->o_counters->sc_ops_completed, 1); \
 943                 ldap_pvt_thread_mutex_unlock( &op->o_counters->sc_mutex ); \
 944         } while (0)
 945 #endif /* !SLAPD_MONITOR */
 946
 947 /*
 948  * NOTE: keep in sync with enum in slapd.h
 949  */
 950 static BI_op_func *opfun[] = {
 951         do_bind,
 952         do_unbind,
 953         do_search,
 954         do_compare,
 955         do_modify,
 956         do_modrdn,
 957         do_add,
 958         do_delete,
 959         do_abandon,
 960         do_extended,
 961         NULL
 962 };
 963
 964 /* Counters are per-thread, not per-connection.
 965  */
 966 static void
 967 conn_counter_destroy( void *key, void *data )
 968 {
 969         slap_counters_t **prev, *sc;
 970
 971         ldap_pvt_thread_mutex_lock( &slap_counters.sc_mutex );
 972         for ( prev = &slap_counters.sc_next, sc = slap_counters.sc_next; sc;
 973                 prev = &sc->sc_next, sc = sc->sc_next ) {
 974                 if ( sc == data ) {
 975                         int i;
 976
 977                         *prev = sc->sc_next;
 978                         /* Copy data to main counter */
 979                         ldap_pvt_mp_add( slap_counters.sc_bytes, sc->sc_bytes );
 980                         ldap_pvt_mp_add( slap_counters.sc_pdu, sc->sc_pdu );
 981                         ldap_pvt_mp_add( slap_counters.sc_entries, sc->sc_entries );
 982                         ldap_pvt_mp_add( slap_counters.sc_refs, sc->sc_refs );
 983                         ldap_pvt_mp_add( slap_counters.sc_ops_initiated, sc->sc_ops_initiated );
 984                         ldap_pvt_mp_add( slap_counters.sc_ops_completed, sc->sc_ops_completed );
 985 #ifdef SLAPD_MONITOR
 986                         for ( i = 0; i < SLAP_OP_LAST; i++ ) {
 987                                 ldap_pvt_mp_add( slap_counters.sc_ops_initiated_[ i ], sc->sc_ops_initiated_[ i ] );
 988                                 ldap_pvt_mp_add( slap_counters.sc_ops_initiated_[ i ], sc->sc_ops_completed_[ i ] );
 989                         }
 990 #endif /* SLAPD_MONITOR */
 991                         slap_counters_destroy( sc );
 992                         ber_memfree_x( data, NULL );
 993                         break;
 994                 }
 995         }
 996         ldap_pvt_thread_mutex_unlock( &slap_counters.sc_mutex );
 997 }
 998
 999 static void
1000 conn_counter_init( Operation *op, void *ctx )
1001 {
1002         slap_counters_t *sc;
1003         void *vsc = NULL;
1004
1005         if ( ldap_pvt_thread_pool_getkey(
1006                         ctx, (void *)conn_counter_init, &vsc, NULL ) || !vsc ) {
1007                 vsc = ch_malloc( sizeof( slap_counters_t ));
1008                 sc = vsc;
1009                 slap_counters_init( sc );
1010                 ldap_pvt_thread_pool_setkey( ctx, (void*)conn_counter_init, vsc,
1011                         conn_counter_destroy, NULL, NULL );
1012
1013                 ldap_pvt_thread_mutex_lock( &slap_counters.sc_mutex );
1014                 sc->sc_next = slap_counters.sc_next;
1015                 slap_counters.sc_next = sc;
1016                 ldap_pvt_thread_mutex_unlock( &slap_counters.sc_mutex );
1017         }
1018         op->o_counters = vsc;
1019 }
1020
1021 static void *
1022 connection_operation( void *ctx, void *arg_v )
1023 {
1024         int rc = LDAP_OTHER;
1025         Operation *op = arg_v;
1026         SlapReply rs = {REP_RESULT};
1027         ber_tag_t tag = op->o_tag;
1028         slap_op_t opidx = SLAP_OP_LAST;
1029         Connection *conn = op->o_conn;
1030         void *memctx = NULL;
1031         void *memctx_null = NULL;
1032         ber_len_t memsiz;
1033
1034         conn_counter_init( op, ctx );
1035         ldap_pvt_thread_mutex_lock( &op->o_counters->sc_mutex );
1036         /* FIXME: returns 0 in case of failure */
1037         ldap_pvt_mp_add_ulong(op->o_counters->sc_ops_initiated, 1);
1038         ldap_pvt_thread_mutex_unlock( &op->o_counters->sc_mutex );
1039
1040         op->o_threadctx = ctx;
1041         op->o_tid = ldap_pvt_thread_pool_tid( ctx );
1042
1043         switch ( tag ) {
1044         case LDAP_REQ_BIND:
1045         case LDAP_REQ_UNBIND:
1046         case LDAP_REQ_ADD:
1047         case LDAP_REQ_DELETE:
1048         case LDAP_REQ_MODDN:
1049         case LDAP_REQ_MODIFY:
1050         case LDAP_REQ_COMPARE:
1051         case LDAP_REQ_SEARCH:
1052         case LDAP_REQ_ABANDON:
1053         case LDAP_REQ_EXTENDED:
1054                 break;
1055         default:
1056                 Debug( LDAP_DEBUG_ANY, "connection_operation: "
1057                         "conn %lu unknown LDAP request 0x%lx\n",
1058                         conn->c_connid, tag, 0 );
1059                 op->o_tag = LBER_ERROR;
1060                 rs.sr_err = LDAP_PROTOCOL_ERROR;
1061                 rs.sr_text = "unknown LDAP request";
1062                 send_ldap_disconnect( op, &rs );
1063                 rc = SLAPD_DISCONNECT;
1064                 goto operations_error;
1065         }
1066
1067         if( conn->c_sasl_bind_in_progress && tag != LDAP_REQ_BIND ) {
1068                 Debug( LDAP_DEBUG_ANY, "connection_operation: "
1069                         "error: SASL bind in progress (tag=%ld).\n",
1070                         (long) tag, 0, 0 );
1071                 send_ldap_error( op, &rs, LDAP_OPERATIONS_ERROR,
1072                         "SASL bind in progress" );
1073                 rc = LDAP_OPERATIONS_ERROR;
1074                 goto operations_error;
1075         }
1076
1077 #ifdef LDAP_X_TXN
1078         if (( conn->c_txn == CONN_TXN_SPECIFY ) && (
1079                 ( tag == LDAP_REQ_ADD ) ||
1080                 ( tag == LDAP_REQ_DELETE ) ||
1081                 ( tag == LDAP_REQ_MODIFY ) ||
1082                 ( tag == LDAP_REQ_MODRDN )))
1083         {
1084                 /* Disable SLAB allocator for all update operations
1085                         issued inside of a transaction */
1086                 op->o_tmpmemctx = NULL;
1087                 op->o_tmpmfuncs = &ch_mfuncs;
1088         } else
1089 #endif
1090         {
1091         /* We can use Thread-Local storage for most mallocs. We can
1092          * also use TL for ber parsing, but not on Add or Modify.
1093          */
1094 #if 0
1095         memsiz = ber_len( op->o_ber ) * 64;
1096         if ( SLAP_SLAB_SIZE > memsiz ) memsiz = SLAP_SLAB_SIZE;
1097 #endif
1098         memsiz = SLAP_SLAB_SIZE;
1099
1100         memctx = slap_sl_mem_create( memsiz, SLAP_SLAB_STACK, ctx, 1 );
1101         op->o_tmpmemctx = memctx;
1102         op->o_tmpmfuncs = &slap_sl_mfuncs;
1103         if ( tag != LDAP_REQ_ADD && tag != LDAP_REQ_MODIFY ) {
1104                 /* Note - the ber and its buffer are already allocated from
1105                  * regular memory; this only affects subsequent mallocs that
1106                  * ber_scanf may invoke.
1107                  */
1108                 ber_set_option( op->o_ber, LBER_OPT_BER_MEMCTX, &memctx );
1109         }
1110         }
1111
1112         opidx = slap_req2op( tag );
1113         assert( opidx != SLAP_OP_LAST );
1114         INCR_OP_INITIATED( opidx );
1115         rc = (*(opfun[opidx]))( op, &rs );
1116
1117 operations_error:
1118         if ( rc == SLAPD_DISCONNECT ) {
1119                 tag = LBER_ERROR;
1120
1121         } else if ( opidx != SLAP_OP_LAST ) {
1122                 /* increment completed operations count
1123                  * only if operation was initiated
1124                  * and rc != SLAPD_DISCONNECT */
1125                 INCR_OP_COMPLETED( opidx );
1126         }
1127
1128         if ( op->o_cancel == SLAP_CANCEL_REQ ) {
1129                 if ( rc == SLAPD_ABANDON ) {
1130                         op->o_cancel = SLAP_CANCEL_ACK;
1131                 } else {
1132                         op->o_cancel = LDAP_TOO_LATE;
1133                 }
1134         }
1135
1136         while ( op->o_cancel != SLAP_CANCEL_NONE &&
1137                 op->o_cancel != SLAP_CANCEL_DONE )
1138         {
1139                 ldap_pvt_thread_yield();
1140         }
1141
1142         ldap_pvt_thread_mutex_lock( &conn->c_mutex );
1143
1144         ber_set_option( op->o_ber, LBER_OPT_BER_MEMCTX, &memctx_null );
1145
1146         LDAP_STAILQ_REMOVE( &conn->c_ops, op, Operation, o_next);
1147         LDAP_STAILQ_NEXT(op, o_next) = NULL;
1148         conn->c_n_ops_executing--;
1149         conn->c_n_ops_completed++;
1150
1151         switch( tag ) {
1152         case LBER_ERROR:
1153         case LDAP_REQ_UNBIND:
1154                 /* c_mutex is locked */
1155                 connection_closing( conn,
1156                         tag == LDAP_REQ_UNBIND ? NULL : "operations error" );
1157                 break;
1158         }
1159
1160         connection_resched( conn );
1161         ldap_pvt_thread_mutex_unlock( &conn->c_mutex );
1162         slap_op_free( op, ctx );
1163         return NULL;
1164 }
1165
1166 static const Listener dummy_list = { BER_BVC(""), BER_BVC("") };
1167
1168 Connection *connection_client_setup(
1169         ber_socket_t s,
1170         ldap_pvt_thread_start_t *func,
1171         void *arg )
1172 {
1173         Connection *c;
1174         ber_socket_t sfd = SLAP_SOCKNEW( s );
1175
1176         c = connection_init( sfd, (Listener *)&dummy_list, "", "",
1177                 CONN_IS_CLIENT, 0, NULL
1178                 LDAP_PF_LOCAL_SENDMSG_ARG(NULL));
1179         if ( c ) {
1180                 c->c_clientfunc = func;
1181                 c->c_clientarg = arg;
1182
1183                 slapd_add_internal( sfd, 0 );
1184         }
1185         return c;
1186 }
1187
1188 void connection_client_enable(
1189         Connection *c )
1190 {
1191         slapd_set_read( c->c_sd, 1 );
1192 }
1193
1194 void connection_client_stop(
1195         Connection *c )
1196 {
1197         Sockbuf *sb;
1198         ber_socket_t s = c->c_sd;
1199
1200         /* get (locked) connection */
1201         c = connection_get( s );
1202
1203         assert( c->c_conn_state == SLAP_C_CLIENT );
1204
1205         c->c_listener = NULL;
1206         c->c_conn_state = SLAP_C_INVALID;
1207         c->c_struct_state = SLAP_C_UNUSED;
1208         c->c_sd = AC_SOCKET_INVALID;
1209         c->c_close_reason = "?";                        /* should never be needed */
1210         sb = c->c_sb;
1211         c->c_sb = ber_sockbuf_alloc( );
1212         {
1213                 ber_len_t max = sockbuf_max_incoming;
1214                 ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_SET_MAX_INCOMING, &max );
1215         }
1216         slapd_remove( s, sb, 0, 1, 0 );
1217
1218         connection_return( c );
1219 }
1220
1221 static int connection_read( ber_socket_t s, conn_readinfo *cri );
1222
1223 static void* connection_read_thread( void* ctx, void* argv )
1224 {
1225         int rc ;
1226         conn_readinfo cri = { NULL, NULL, NULL, NULL, 0 };
1227         ber_socket_t s = (long)argv;
1228
1229         /*
1230          * read incoming LDAP requests. If there is more than one,
1231          * the first one is returned with new_op
1232          */
1233         cri.ctx = ctx;
1234         if( ( rc = connection_read( s, &cri ) ) < 0 ) {
1235                 Debug( LDAP_DEBUG_CONNS, "connection_read(%d) error\n", s, 0, 0 );
1236                 return (void*)(long)rc;
1237         }
1238
1239         /* execute a single queued request in the same thread */
1240         if( cri.op && !cri.nullop ) {
1241                 rc = (long)connection_operation( ctx, cri.op );
1242         } else if ( cri.func ) {
1243                 rc = (long)cri.func( ctx, cri.arg );
1244         }
1245
1246         return (void*)(long)rc;
1247 }
1248
1249 int connection_read_activate( ber_socket_t s )
1250 {
1251         int rc;
1252
1253         /*
1254          * suspend reading on this file descriptor until a connection processing
1255          * thread reads data on it. Otherwise the listener thread will repeatedly
1256          * submit the same event on it to the pool.
1257          */
1258         rc = slapd_clr_read( s, 0 );
1259         if ( rc )
1260                 return rc;
1261
1262         rc = ldap_pvt_thread_pool_submit( &connection_pool,
1263                 connection_read_thread, (void *)(long)s );
1264
1265         if( rc != 0 ) {
1266                 Debug( LDAP_DEBUG_ANY,
1267                         "connection_read_activate(%d): submit failed (%d)\n",
1268                         s, rc, 0 );
1269         }
1270
1271         return rc;
1272 }
1273
1274 static int
1275 connection_read( ber_socket_t s, conn_readinfo *cri )
1276 {
1277         int rc = 0;
1278         Connection *c;
1279
1280         assert( connections != NULL );
1281
1282         /* get (locked) connection */
1283         c = connection_get( s );
1284
1285         if( c == NULL ) {
1286                 Debug( LDAP_DEBUG_ANY,
1287                         "connection_read(%ld): no connection!\n",
1288                         (long) s, 0, 0 );
1289
1290                 return -1;
1291         }
1292
1293         c->c_n_read++;
1294
1295         if( c->c_conn_state == SLAP_C_CLOSING ) {
1296                 Debug( LDAP_DEBUG_CONNS,
1297                         "connection_read(%d): closing, ignoring input for id=%lu\n",
1298                         s, c->c_connid, 0 );
1299                 connection_return( c );
1300                 return 0;
1301         }
1302
1303         if ( c->c_conn_state == SLAP_C_CLIENT ) {
1304                 cri->func = c->c_clientfunc;
1305                 cri->arg = c->c_clientarg;
1306                 /* read should already be cleared */
1307                 connection_return( c );
1308                 return 0;
1309         }
1310
1311         Debug( LDAP_DEBUG_TRACE,
1312                 "connection_read(%d): checking for input on id=%lu\n",
1313                 s, c->c_connid, 0 );
1314
1315 #ifdef HAVE_TLS
1316         if ( c->c_is_tls && c->c_needs_tls_accept ) {
1317                 rc = ldap_pvt_tls_accept( c->c_sb, slap_tls_ctx );
1318                 if ( rc < 0 ) {
1319                         Debug( LDAP_DEBUG_TRACE,
1320                                 "connection_read(%d): TLS accept failure "
1321                                 "error=%d id=%lu, closing\n",
1322                                 s, rc, c->c_connid );
1323
1324                         c->c_needs_tls_accept = 0;
1325                         /* c_mutex is locked */
1326                         connection_closing( c, "TLS negotiation failure" );
1327                         connection_close( c );
1328                         connection_return( c );
1329                         return 0;
1330
1331                 } else if ( rc == 0 ) {
1332                         void *ssl;
1333                         struct berval authid = BER_BVNULL;
1334
1335                         c->c_needs_tls_accept = 0;
1336
1337                         /* we need to let SASL know */
1338                         ssl = ldap_pvt_tls_sb_ctx( c->c_sb );
1339
1340                         c->c_tls_ssf = (slap_ssf_t) ldap_pvt_tls_get_strength( ssl );
1341                         if( c->c_tls_ssf > c->c_ssf ) {
1342                                 c->c_ssf = c->c_tls_ssf;
1343                         }
1344
1345                         rc = dnX509peerNormalize( ssl, &authid );
1346                         if ( rc != LDAP_SUCCESS ) {
1347                                 Debug( LDAP_DEBUG_TRACE, "connection_read(%d): "
1348                                         "unable to get TLS client DN, error=%d id=%lu\n",
1349                                         s, rc, c->c_connid );
1350                         }
1351                         Statslog( LDAP_DEBUG_STATS,
1352                                 "conn=%lu fd=%d TLS established tls_ssf=%u ssf=%u\n",
1353                             c->c_connid, (int) s, c->c_tls_ssf, c->c_ssf, 0 );
1354                         slap_sasl_external( c, c->c_tls_ssf, &authid );
1355                         if ( authid.bv_val ) free( authid.bv_val );
1356                 }
1357
1358                 /* if success and data is ready, fall thru to data input loop */
1359                 if( !ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_DATA_READY, NULL ) )
1360                 {
1361                         slapd_set_read( s, 1 );
1362                         connection_return( c );
1363                         return 0;
1364                 }
1365         }
1366 #endif
1367
1368 #ifdef HAVE_CYRUS_SASL
1369         if ( c->c_sasl_layers ) {
1370                 /* If previous layer is not removed yet, give up for now */
1371                 if ( !c->c_sasl_sockctx ) {
1372                         slapd_set_read( s, 1 );
1373                         connection_return( c );
1374                         return 0;
1375                 }
1376
1377                 c->c_sasl_layers = 0;
1378
1379                 rc = ldap_pvt_sasl_install( c->c_sb, c->c_sasl_sockctx );
1380                 if( rc != LDAP_SUCCESS ) {
1381                         Debug( LDAP_DEBUG_TRACE,
1382                                 "connection_read(%d): SASL install error "
1383                                 "error=%d id=%lu, closing\n",
1384                                 s, rc, c->c_connid );
1385
1386                         /* c_mutex is locked */
1387                         connection_closing( c, "SASL layer install failure" );
1388                         connection_close( c );
1389                         connection_return( c );
1390                         return 0;
1391                 }
1392         }
1393 #endif
1394
1395 #define CONNECTION_INPUT_LOOP 1
1396 /* #define      DATA_READY_LOOP 1 */
1397
1398         do {
1399                 /* How do we do this without getting into a busy loop ? */
1400                 rc = connection_input( c, cri );
1401         }
1402 #ifdef DATA_READY_LOOP
1403         while( !rc && ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_DATA_READY, NULL ));
1404 #elif defined CONNECTION_INPUT_LOOP
1405         while(!rc);
1406 #else
1407         while(0);
1408 #endif
1409
1410         if( rc < 0 ) {
1411                 Debug( LDAP_DEBUG_CONNS,
1412                         "connection_read(%d): input error=%d id=%lu, closing.\n",
1413                         s, rc, c->c_connid );
1414
1415                 /* c_mutex is locked */
1416                 connection_closing( c, conn_lost_str );
1417                 connection_close( c );
1418                 connection_return( c );
1419                 return 0;
1420         }
1421
1422         if ( ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_NEEDS_WRITE, NULL ) ) {
1423                 slapd_set_write( s, 0 );
1424         }
1425
1426         slapd_set_read( s, 1 );
1427         connection_return( c );
1428
1429         return 0;
1430 }
1431
1432 static int
1433 connection_input( Connection *conn , conn_readinfo *cri )
1434 {
1435         Operation *op;
1436         ber_tag_t       tag;
1437         ber_len_t       len;
1438         ber_int_t       msgid;
1439         BerElement      *ber;
1440         int             rc;
1441 #ifdef LDAP_CONNECTIONLESS
1442         Sockaddr        peeraddr;
1443         char            *cdn = NULL;
1444 #endif
1445         char *defer = NULL;
1446         void *ctx;
1447
1448         if ( conn->c_currentber == NULL &&
1449                 ( conn->c_currentber = ber_alloc()) == NULL )
1450         {
1451                 Debug( LDAP_DEBUG_ANY, "ber_alloc failed\n", 0, 0, 0 );
1452                 return -1;
1453         }
1454
1455         sock_errset(0);
1456
1457 #ifdef LDAP_CONNECTIONLESS
1458         if ( conn->c_is_udp ) {
1459                 char peername[sizeof("IP=255.255.255.255:65336")];
1460
1461                 len = ber_int_sb_read(conn->c_sb, &peeraddr, sizeof(struct sockaddr));
1462                 if (len != sizeof(struct sockaddr)) return 1;
1463
1464                 sprintf( peername, "IP=%s:%d",
1465                         inet_ntoa( peeraddr.sa_in_addr.sin_addr ),
1466                         (unsigned) ntohs( peeraddr.sa_in_addr.sin_port ) );
1467                 Statslog( LDAP_DEBUG_STATS,
1468                         "conn=%lu UDP request from %s (%s) accepted.\n",
1469                         conn->c_connid, peername, conn->c_sock_name.bv_val, 0, 0 );
1470         }
1471 #endif
1472
1473         tag = ber_get_next( conn->c_sb, &len, conn->c_currentber );
1474         if ( tag != LDAP_TAG_MESSAGE ) {
1475                 int err = sock_errno();
1476
1477                 if ( err != EWOULDBLOCK && err != EAGAIN ) {
1478                         /* log, close and send error */
1479                         Debug( LDAP_DEBUG_TRACE,
1480                                 "ber_get_next on fd %d failed errno=%d (%s)\n",
1481                         conn->c_sd, err, sock_errstr(err) );
1482                         ber_free( conn->c_currentber, 1 );
1483                         conn->c_currentber = NULL;
1484
1485                         return -2;
1486                 }
1487                 return 1;
1488         }
1489
1490         ber = conn->c_currentber;
1491         conn->c_currentber = NULL;
1492
1493         if ( (tag = ber_get_int( ber, &msgid )) != LDAP_TAG_MSGID ) {
1494                 /* log, close and send error */
1495                 Debug( LDAP_DEBUG_ANY, "ber_get_int returns 0x%lx\n", tag, 0, 0 );
1496                 ber_free( ber, 1 );
1497                 return -1;
1498         }
1499
1500         if ( (tag = ber_peek_tag( ber, &len )) == LBER_ERROR ) {
1501                 /* log, close and send error */
1502                 Debug( LDAP_DEBUG_ANY, "ber_peek_tag returns 0x%lx\n", tag, 0, 0 );
1503                 ber_free( ber, 1 );
1504
1505                 return -1;
1506         }
1507
1508 #ifdef LDAP_CONNECTIONLESS
1509         if( conn->c_is_udp ) {
1510                 if( tag == LBER_OCTETSTRING ) {
1511                         ber_get_stringa( ber, &cdn );
1512                         tag = ber_peek_tag(ber, &len);
1513                 }
1514                 if( tag != LDAP_REQ_ABANDON && tag != LDAP_REQ_SEARCH ) {
1515                         Debug( LDAP_DEBUG_ANY, "invalid req for UDP 0x%lx\n", tag, 0, 0 );
1516                         ber_free( ber, 1 );
1517                         return 0;
1518                 }
1519         }
1520 #endif
1521
1522         if(tag == LDAP_REQ_BIND) {
1523                 /* immediately abandon all existing operations upon BIND */
1524                 connection_abandon( conn );
1525         }
1526
1527         ctx = cri->ctx;
1528         op = slap_op_alloc( ber, msgid, tag, conn->c_n_ops_received++, ctx );
1529
1530         op->o_conn = conn;
1531         /* clear state if the connection is being reused from inactive */
1532         if ( conn->c_conn_state == SLAP_C_INACTIVE ) {
1533                 memset( &conn->c_pagedresults_state, 0,
1534                         sizeof( conn->c_pagedresults_state ) );
1535         }
1536
1537         op->o_res_ber = NULL;
1538
1539 #ifdef LDAP_CONNECTIONLESS
1540         if (conn->c_is_udp) {
1541                 if ( cdn ) {
1542                         ber_str2bv( cdn, 0, 1, &op->o_dn );
1543                         op->o_protocol = LDAP_VERSION2;
1544                 }
1545                 op->o_res_ber = ber_alloc_t( LBER_USE_DER );
1546                 if (op->o_res_ber == NULL) return 1;
1547
1548                 rc = ber_write( op->o_res_ber, (char *)&peeraddr,
1549                         sizeof(struct sockaddr), 0 );
1550
1551                 if (rc != sizeof(struct sockaddr)) {
1552                         Debug( LDAP_DEBUG_ANY, "ber_write failed\n", 0, 0, 0 );
1553                         return 1;
1554                 }
1555
1556                 if (op->o_protocol == LDAP_VERSION2) {
1557                         rc = ber_printf(op->o_res_ber, "{is{" /*}}*/, op->o_msgid, "");
1558                         if (rc == -1) {
1559                                 Debug( LDAP_DEBUG_ANY, "ber_write failed\n", 0, 0, 0 );
1560                                 return rc;
1561                         }
1562                 }
1563         }
1564 #endif /* LDAP_CONNECTIONLESS */
1565
1566         rc = 0;
1567
1568         /* Don't process requests when the conn is in the middle of a
1569          * Bind, or if it's closing. Also, don't let any single conn
1570          * use up all the available threads, and don't execute if we're
1571          * currently blocked on output. And don't execute if there are
1572          * already pending ops, let them go first.  Abandon operations
1573          * get exceptions to some, but not all, cases.
1574          */
1575         switch( tag ){
1576         default:
1577                 /* Abandon and Unbind are exempt from these checks */
1578                 if (conn->c_conn_state == SLAP_C_CLOSING) {
1579                         defer = "closing";
1580                         break;
1581                 } else if (conn->c_writewaiter) {
1582                         defer = "awaiting write";
1583                         break;
1584                 } else if (conn->c_n_ops_pending) {
1585                         defer = "pending operations";
1586                         break;
1587                 }
1588                 /* FALLTHRU */
1589         case LDAP_REQ_ABANDON:
1590                 /* Unbind is exempt from these checks */
1591                 if (conn->c_n_ops_executing >= connection_pool_max/2) {
1592                         defer = "too many executing";
1593                         break;
1594                 } else if (conn->c_conn_state == SLAP_C_BINDING) {
1595                         defer = "binding";
1596                         break;
1597                 }
1598                 /* FALLTHRU */
1599         case LDAP_REQ_UNBIND:
1600                 break;
1601         }
1602
1603         if( defer ) {
1604                 int max = conn->c_dn.bv_len
1605                         ? slap_conn_max_pending_auth
1606                         : slap_conn_max_pending;
1607
1608                 Debug( LDAP_DEBUG_ANY,
1609                         "connection_input: conn=%lu deferring operation: %s\n",
1610                         conn->c_connid, defer, 0 );
1611                 conn->c_n_ops_pending++;
1612                 LDAP_STAILQ_INSERT_TAIL( &conn->c_pending_ops, op, o_next );
1613                 rc = ( conn->c_n_ops_pending > max ) ? -1 : 0;
1614
1615         } else {
1616                 conn->c_n_ops_executing++;
1617
1618                 /*
1619                  * The first op will be processed in the same thread context,
1620                  * as long as there is only one op total.
1621                  * Subsequent ops will be submitted to the pool by
1622                  * calling connection_op_activate()
1623                  */
1624                 if ( cri->op == NULL ) {
1625                         /* the first incoming request */
1626                         connection_op_queue( op );
1627                         cri->op = op;
1628                 } else {
1629                         if ( !cri->nullop ) {
1630                                 cri->nullop = 1;
1631                                 rc = ldap_pvt_thread_pool_submit( &connection_pool,
1632                                         connection_operation, (void *) cri->op );
1633                         }
1634                         connection_op_activate( op );
1635                 }
1636         }
1637
1638 #ifdef NO_THREADS
1639         if ( conn->c_struct_state != SLAP_C_USED ) {
1640                 /* connection must have got closed underneath us */
1641                 return 1;
1642         }
1643 #endif
1644
1645         assert( conn->c_struct_state == SLAP_C_USED );
1646         return rc;
1647 }
1648
1649 static int
1650 connection_resched( Connection *conn )
1651 {
1652         Operation *op;
1653
1654         if( conn->c_writewaiter )
1655                 return 0;
1656
1657         if( conn->c_conn_state == SLAP_C_CLOSING ) {
1658                 Debug( LDAP_DEBUG_CONNS, "connection_resched: "
1659                         "attempting closing conn=%lu sd=%d\n",
1660                         conn->c_connid, conn->c_sd, 0 );
1661                 connection_close( conn );
1662                 return 0;
1663         }
1664
1665         if( conn->c_conn_state != SLAP_C_ACTIVE ) {
1666                 /* other states need different handling */
1667                 return 0;
1668         }
1669
1670         while ((op = LDAP_STAILQ_FIRST( &conn->c_pending_ops )) != NULL) {
1671                 if ( conn->c_n_ops_executing > connection_pool_max/2 ) break;
1672
1673                 LDAP_STAILQ_REMOVE_HEAD( &conn->c_pending_ops, o_next );
1674                 LDAP_STAILQ_NEXT(op, o_next) = NULL;
1675
1676                 /* pending operations should not be marked for abandonment */
1677                 assert(!op->o_abandon);
1678
1679                 conn->c_n_ops_pending--;
1680                 conn->c_n_ops_executing++;
1681
1682                 connection_op_activate( op );
1683
1684                 if ( conn->c_conn_state == SLAP_C_BINDING ) break;
1685         }
1686         return 0;
1687 }
1688
1689 static void
1690 connection_init_log_prefix( Operation *op )
1691 {
1692         if ( op->o_connid == (unsigned long)(-1) ) {
1693                 snprintf( op->o_log_prefix, sizeof( op->o_log_prefix ),
1694                         "conn=-1 op=%lu", op->o_opid );
1695
1696         } else {
1697                 snprintf( op->o_log_prefix, sizeof( op->o_log_prefix ),
1698                         "conn=%lu op=%lu", op->o_connid, op->o_opid );
1699         }
1700 }
1701
1702 static int connection_bind_cleanup_cb( Operation *op, SlapReply *rs )
1703 {
1704         op->o_conn->c_sasl_bindop = NULL;
1705
1706         ch_free( op->o_callback );
1707         op->o_callback = NULL;
1708
1709         return SLAP_CB_CONTINUE;
1710 }
1711
1712 static int connection_bind_cb( Operation *op, SlapReply *rs )
1713 {
1714         ldap_pvt_thread_mutex_lock( &op->o_conn->c_mutex );
1715         if ( op->o_conn->c_conn_state == SLAP_C_BINDING )
1716                 op->o_conn->c_conn_state = SLAP_C_ACTIVE;
1717         op->o_conn->c_sasl_bind_in_progress =
1718                 ( rs->sr_err == LDAP_SASL_BIND_IN_PROGRESS );
1719
1720         /* Moved here from bind.c due to ITS#4158 */
1721         op->o_conn->c_sasl_bindop = NULL;
1722         if ( op->orb_method == LDAP_AUTH_SASL ) {
1723                 if( rs->sr_err == LDAP_SUCCESS ) {
1724                         ber_dupbv(&op->o_conn->c_dn, &op->orb_edn);
1725                         if( !BER_BVISEMPTY( &op->orb_edn ) ) {
1726                                 /* edn is always normalized already */
1727                                 ber_dupbv( &op->o_conn->c_ndn, &op->o_conn->c_dn );
1728                         }
1729                         op->o_tmpfree( op->orb_edn.bv_val, op->o_tmpmemctx );
1730                         BER_BVZERO( &op->orb_edn );
1731                         op->o_conn->c_authmech = op->o_conn->c_sasl_bind_mech;
1732                         BER_BVZERO( &op->o_conn->c_sasl_bind_mech );
1733
1734                         op->o_conn->c_sasl_ssf = op->orb_ssf;
1735                         if( op->orb_ssf > op->o_conn->c_ssf ) {
1736                                 op->o_conn->c_ssf = op->orb_ssf;
1737                         }
1738
1739                         if( !BER_BVISEMPTY( &op->o_conn->c_dn ) ) {
1740                                 ber_len_t max = sockbuf_max_incoming_auth;
1741                                 ber_sockbuf_ctrl( op->o_conn->c_sb,
1742                                         LBER_SB_OPT_SET_MAX_INCOMING, &max );
1743                         }
1744
1745                         /* log authorization identity */
1746                         Statslog( LDAP_DEBUG_STATS,
1747                                 "%s BIND dn=\"%s\" mech=%s sasl_ssf=%d ssf=%d\n",
1748                                 op->o_log_prefix,
1749                                 BER_BVISNULL( &op->o_conn->c_dn ) ? "<empty>" : op->o_conn->c_dn.bv_val,
1750                                 op->o_conn->c_authmech.bv_val,
1751                                 op->orb_ssf, op->o_conn->c_ssf );
1752
1753                         Debug( LDAP_DEBUG_TRACE,
1754                                 "do_bind: SASL/%s bind: dn=\"%s\" sasl_ssf=%d\n",
1755                                 op->o_conn->c_authmech.bv_val,
1756                                 BER_BVISNULL( &op->o_conn->c_dn ) ? "<empty>" : op->o_conn->c_dn.bv_val,
1757                                 op->orb_ssf );
1758
1759                 } else if ( rs->sr_err != LDAP_SASL_BIND_IN_PROGRESS ) {
1760                         if ( !BER_BVISNULL( &op->o_conn->c_sasl_bind_mech ) ) {
1761                                 free( op->o_conn->c_sasl_bind_mech.bv_val );
1762                                 BER_BVZERO( &op->o_conn->c_sasl_bind_mech );
1763                         }
1764                 }
1765         }
1766         ldap_pvt_thread_mutex_unlock( &op->o_conn->c_mutex );
1767
1768         ch_free( op->o_callback );
1769         op->o_callback = NULL;
1770
1771         return SLAP_CB_CONTINUE;
1772 }
1773
1774 static void connection_op_queue( Operation *op )
1775 {
1776         ber_tag_t tag = op->o_tag;
1777
1778         if (tag == LDAP_REQ_BIND) {
1779                 slap_callback *sc = ch_calloc( 1, sizeof( slap_callback ));
1780                 sc->sc_response = connection_bind_cb;
1781                 sc->sc_cleanup = connection_bind_cleanup_cb;
1782                 sc->sc_next = op->o_callback;
1783                 op->o_callback = sc;
1784                 op->o_conn->c_conn_state = SLAP_C_BINDING;
1785         }
1786
1787         if (!op->o_dn.bv_len) {
1788                 op->o_authz = op->o_conn->c_authz;
1789                 if ( BER_BVISNULL( &op->o_conn->c_sasl_authz_dn )) {
1790                         ber_dupbv( &op->o_dn, &op->o_conn->c_dn );
1791                         ber_dupbv( &op->o_ndn, &op->o_conn->c_ndn );
1792                 } else {
1793                         ber_dupbv( &op->o_dn, &op->o_conn->c_sasl_authz_dn );
1794                         ber_dupbv( &op->o_ndn, &op->o_conn->c_sasl_authz_dn );
1795                 }
1796         }
1797
1798         op->o_authtype = op->o_conn->c_authtype;
1799         ber_dupbv( &op->o_authmech, &op->o_conn->c_authmech );
1800
1801         if (!op->o_protocol) {
1802                 op->o_protocol = op->o_conn->c_protocol
1803                         ? op->o_conn->c_protocol : LDAP_VERSION3;
1804         }
1805
1806         if (op->o_conn->c_conn_state == SLAP_C_INACTIVE &&
1807                 op->o_protocol > LDAP_VERSION2)
1808         {
1809                 op->o_conn->c_conn_state = SLAP_C_ACTIVE;
1810         }
1811
1812         op->o_connid = op->o_conn->c_connid;
1813         connection_init_log_prefix( op );
1814
1815         LDAP_STAILQ_INSERT_TAIL( &op->o_conn->c_ops, op, o_next );
1816 }
1817
1818 static int connection_op_activate( Operation *op )
1819 {
1820         int rc;
1821
1822         connection_op_queue( op );
1823
1824         rc = ldap_pvt_thread_pool_submit( &connection_pool,
1825                 connection_operation, (void *) op );
1826
1827         if ( rc != 0 ) {
1828                 Debug( LDAP_DEBUG_ANY,
1829                         "connection_op_activate: submit failed (%d) for conn=%lu\n",
1830                         rc, op->o_connid, 0 );
1831                 /* should move op to pending list */
1832         }
1833
1834         return rc;
1835 }
1836
1837 int connection_write(ber_socket_t s)
1838 {
1839         Connection *c;
1840         Operation *op;
1841
1842         assert( connections != NULL );
1843
1844         slapd_clr_write( s, 0 );
1845
1846         c = connection_get( s );
1847         if( c == NULL ) {
1848                 Debug( LDAP_DEBUG_ANY,
1849                         "connection_write(%ld): no connection!\n",
1850                         (long)s, 0, 0 );
1851                 return -1;
1852         }
1853
1854         c->c_n_write++;
1855
1856         Debug( LDAP_DEBUG_TRACE,
1857                 "connection_write(%d): waking output for id=%lu\n",
1858                 s, c->c_connid, 0 );
1859         ldap_pvt_thread_mutex_lock( &c->c_write2_mutex );
1860         ldap_pvt_thread_cond_signal( &c->c_write2_cv );
1861         ldap_pvt_thread_mutex_unlock( &c->c_write2_mutex );
1862
1863         if ( ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_NEEDS_READ, NULL ) ) {
1864                 slapd_set_read( s, 1 );
1865         }
1866         if ( ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_NEEDS_WRITE, NULL ) ) {
1867                 slapd_set_write( s, 1 );
1868         }
1869
1870         /* If there are ops pending because of a writewaiter,
1871          * start one up.
1872          */
1873         while ((op = LDAP_STAILQ_FIRST( &c->c_pending_ops )) != NULL) {
1874                 if ( !c->c_writewaiter ) break;
1875                 if ( c->c_n_ops_executing > connection_pool_max/2 ) break;
1876
1877                 LDAP_STAILQ_REMOVE_HEAD( &c->c_pending_ops, o_next );
1878                 LDAP_STAILQ_NEXT(op, o_next) = NULL;
1879
1880                 /* pending operations should not be marked for abandonment */
1881                 assert(!op->o_abandon);
1882
1883                 c->c_n_ops_pending--;
1884                 c->c_n_ops_executing++;
1885
1886                 connection_op_activate( op );
1887
1888                 break;
1889         }
1890
1891         connection_return( c );
1892         return 0;
1893 }
1894
1895 #ifdef LDAP_SLAPI
1896 typedef struct conn_fake_extblock {
1897         void *eb_conn;
1898         void *eb_op;
1899 } conn_fake_extblock;
1900
1901 static void
1902 connection_fake_destroy(
1903         void *key,
1904         void *data )
1905 {
1906         Connection conn = {0};
1907         Operation op = {0};
1908         Opheader ohdr = {0};
1909
1910         conn_fake_extblock *eb = data;
1911
1912         op.o_hdr = &ohdr;
1913         op.o_hdr->oh_extensions = eb->eb_op;
1914         conn.c_extensions = eb->eb_conn;
1915         op.o_conn = &conn;
1916         conn.c_connid = -1;
1917         op.o_connid = -1;
1918
1919         ber_memfree_x( eb, NULL );
1920         slapi_int_free_object_extensions( SLAPI_X_EXT_OPERATION, &op );
1921         slapi_int_free_object_extensions( SLAPI_X_EXT_CONNECTION, &conn );
1922 }
1923 #endif
1924
1925 void
1926 connection_fake_init(
1927         Connection *conn,
1928         OperationBuffer *opbuf,
1929         void *ctx )
1930 {
1931         connection_fake_init2( conn, opbuf, ctx, 1 );
1932 }
1933
1934 void
1935 operation_fake_init(
1936         Connection *conn,
1937         Operation *op,
1938         void *ctx,
1939         int newmem )
1940 {
1941         /* set memory context */
1942         op->o_tmpmemctx = slap_sl_mem_create(SLAP_SLAB_SIZE, SLAP_SLAB_STACK, ctx,
1943                 newmem );
1944         op->o_tmpmfuncs = &slap_sl_mfuncs;
1945         op->o_threadctx = ctx;
1946         op->o_tid = ldap_pvt_thread_pool_tid( ctx );
1947
1948         op->o_counters = &slap_counters;
1949         op->o_conn = conn;
1950         op->o_connid = op->o_conn->c_connid;
1951         connection_init_log_prefix( op );
1952 }
1953
1954
1955 void
1956 connection_fake_init2(
1957         Connection *conn,
1958         OperationBuffer *opbuf,
1959         void *ctx,
1960         int newmem )
1961 {
1962         Operation *op = (Operation *) opbuf;
1963
1964         conn->c_connid = -1;
1965         conn->c_conn_idx = -1;
1966         conn->c_send_ldap_result = slap_send_ldap_result;
1967         conn->c_send_search_entry = slap_send_search_entry;
1968         conn->c_send_search_reference = slap_send_search_reference;
1969         conn->c_send_ldap_extended = slap_send_ldap_extended;
1970         conn->c_send_ldap_intermediate = slap_send_ldap_intermediate;
1971         conn->c_listener = (Listener *)&dummy_list;
1972         conn->c_peer_domain = slap_empty_bv;
1973         conn->c_peer_name = slap_empty_bv;
1974
1975         memset( opbuf, 0, sizeof( *opbuf ));
1976         op->o_hdr = &opbuf->ob_hdr;
1977         op->o_controls = opbuf->ob_controls;
1978
1979         operation_fake_init( conn, op, ctx, newmem );
1980
1981 #ifdef LDAP_SLAPI
1982         if ( slapi_plugins_used ) {
1983                 conn_fake_extblock *eb;
1984                 void *ebx = NULL;
1985
1986                 /* Use thread keys to make sure these eventually get cleaned up */
1987                 if ( ldap_pvt_thread_pool_getkey( ctx, (void *)connection_fake_init,
1988                                 &ebx, NULL )) {
1989                         eb = ch_malloc( sizeof( *eb ));
1990                         slapi_int_create_object_extensions( SLAPI_X_EXT_CONNECTION, conn );
1991                         slapi_int_create_object_extensions( SLAPI_X_EXT_OPERATION, op );
1992                         eb->eb_conn = conn->c_extensions;
1993                         eb->eb_op = op->o_hdr->oh_extensions;
1994                         ldap_pvt_thread_pool_setkey( ctx, (void *)connection_fake_init,
1995                                 eb, connection_fake_destroy, NULL, NULL );
1996                 } else {
1997                         eb = ebx;
1998                         conn->c_extensions = eb->eb_conn;
1999                         op->o_hdr->oh_extensions = eb->eb_op;
2000                 }
2001         }
2002 #endif /* LDAP_SLAPI */
2003
2004         slap_op_time( &op->o_time, &op->o_tincr );
2005 }
2006
2007 void
2008 connection_assign_nextid( Connection *conn )
2009 {
2010         ldap_pvt_thread_mutex_lock( &conn_nextid_mutex );
2011         conn->c_connid = conn_nextid++;
2012         ldap_pvt_thread_mutex_unlock( &conn_nextid_mutex );
2013 }