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 1998-2006 The OpenLDAP Foundation.
   5  * All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted only as authorized by the OpenLDAP
   9  * Public License.
  10  *
  11  * A copy of this license is available in the file LICENSE in the
  12  * top-level directory of the distribution or, alternatively, at
  13  * <http://www.OpenLDAP.org/license.html>.
  14  */
  15 /* Portions Copyright (c) 1995 Regents of the University of Michigan.
  16  * All rights reserved.
  17  *
  18  * Redistribution and use in source and binary forms are permitted
  19  * provided that this notice is preserved and that due credit is given
  20  * to the University of Michigan at Ann Arbor. The name of the University
  21  * may not be used to endorse or promote products derived from this
  22  * software without specific prior written permission. This software
  23  * is provided ``as is'' without express or implied warranty.
  24  */
  25
  26 #include "portable.h"
  27
  28 #include <stdio.h>
  29 #ifdef HAVE_LIMITS_H
  30 #include <limits.h>
  31 #endif
  32
  33 #include <ac/socket.h>
  34 #include <ac/errno.h>
  35 #include <ac/string.h>
  36 #include <ac/time.h>
  37 #include <ac/unistd.h>
  38
  39 #include "lutil.h"
  40 #include "slap.h"
  41
  42 #ifdef LDAP_SLAPI
  43 #include "slapi/slapi.h"
  44 #endif
  45
  46 /* protected by connections_mutex */
  47 static ldap_pvt_thread_mutex_t connections_mutex;
  48 static Connection *connections = NULL;
  49
  50 static ldap_pvt_thread_mutex_t conn_nextid_mutex;
  51 static unsigned long conn_nextid = 0;
  52
  53 static const char conn_lost_str[] = "connection lost";
  54
  55 /* structure state (protected by connections_mutex) */
  56 #define SLAP_C_UNINITIALIZED    0x00    /* MUST BE ZERO (0) */
  57 #define SLAP_C_UNUSED                   0x01
  58 #define SLAP_C_USED                             0x02
  59 #define SLAP_C_PENDING                  0x03
  60
  61 /* connection state (protected by c_mutex ) */
  62 #define SLAP_C_INVALID                  0x00    /* MUST BE ZERO (0) */
  63 #define SLAP_C_INACTIVE                 0x01    /* zero threads */
  64 #define SLAP_C_ACTIVE                   0x02    /* one or more threads */
  65 #define SLAP_C_BINDING                  0x03    /* binding */
  66 #define SLAP_C_CLOSING                  0x04    /* closing */
  67 #define SLAP_C_CLIENT                   0x05    /* outbound client conn */
  68
  69 const char *
  70 connection_state2str( int state )
  71 {
  72         switch( state ) {
  73         case SLAP_C_INVALID:    return "!";
  74         case SLAP_C_INACTIVE:   return "|";
  75         case SLAP_C_ACTIVE:             return "";
  76         case SLAP_C_BINDING:    return "B";
  77         case SLAP_C_CLOSING:    return "C";
  78         case SLAP_C_CLIENT:             return "L";
  79         }
  80
  81         return "?";
  82 }
  83
  84 static Connection* connection_get( ber_socket_t s );
  85
  86 #ifdef SLAP_LIGHTWEIGHT_DISPATCHER
  87
  88 typedef struct conn_readinfo {
  89         Operation *op;
  90         ldap_pvt_thread_start_t *func;
  91         void *arg;
  92         int nullop;
  93 } conn_readinfo;
  94
  95 static int connection_input( Connection *c, conn_readinfo *cri );
  96 #else
  97 static int connection_input( Connection *c );
  98 #endif
  99 static void connection_close( Connection *c );
 100
 101 static int connection_op_activate( Operation *op );
 102 #ifdef SLAP_LIGHTWEIGHT_DISPATCHER
 103 static void connection_op_queue( Operation *op );
 104 #endif
 105 static int connection_resched( Connection *conn );
 106 static void connection_abandon( Connection *conn );
 107 static void connection_destroy( Connection *c );
 108
 109 static ldap_pvt_thread_start_t connection_operation;
 110
 111 /*
 112  * Initialize connection management infrastructure.
 113  */
 114 int connections_init(void)
 115 {
 116         int i;
 117
 118         assert( connections == NULL );
 119
 120         if( connections != NULL) {
 121                 Debug( LDAP_DEBUG_ANY, "connections_init: already initialized.\n",
 122                         0, 0, 0 );
 123                 return -1;
 124         }
 125
 126         /* should check return of every call */
 127         ldap_pvt_thread_mutex_init( &connections_mutex );
 128         ldap_pvt_thread_mutex_init( &conn_nextid_mutex );
 129
 130         connections = (Connection *) ch_calloc( dtblsize, sizeof(Connection) );
 131
 132         if( connections == NULL ) {
 133                 Debug( LDAP_DEBUG_ANY, "connections_init: "
 134                         "allocation (%d*%ld) of connection array failed\n",
 135                         dtblsize, (long) sizeof(Connection), 0 );
 136                 return -1;
 137         }
 138
 139         assert( connections[0].c_struct_state == SLAP_C_UNINITIALIZED );
 140         assert( connections[dtblsize-1].c_struct_state == SLAP_C_UNINITIALIZED );
 141
 142         for (i=0; i<dtblsize; i++) connections[i].c_conn_idx = i;
 143
 144         /*
 145          * per entry initialization of the Connection array initialization
 146          * will be done by connection_init()
 147          */
 148
 149         return 0;
 150 }
 151
 152 /*
 153  * Destroy connection management infrastructure.
 154  */
 155
 156 int connections_destroy(void)
 157 {
 158         ber_socket_t i;
 159
 160         /* should check return of every call */
 161
 162         if( connections == NULL) {
 163                 Debug( LDAP_DEBUG_ANY, "connections_destroy: nothing to destroy.\n",
 164                         0, 0, 0 );
 165                 return -1;
 166         }
 167
 168         for ( i = 0; i < dtblsize; i++ ) {
 169                 if( connections[i].c_struct_state != SLAP_C_UNINITIALIZED ) {
 170                         ber_sockbuf_free( connections[i].c_sb );
 171                         ldap_pvt_thread_mutex_destroy( &connections[i].c_mutex );
 172                         ldap_pvt_thread_mutex_destroy( &connections[i].c_write_mutex );
 173                         ldap_pvt_thread_cond_destroy( &connections[i].c_write_cv );
 174 #ifdef LDAP_SLAPI
 175                         if ( slapi_plugins_used ) {
 176                                 slapi_int_free_object_extensions( SLAPI_X_EXT_CONNECTION,
 177                                         &connections[i] );
 178                         }
 179 #endif
 180                 }
 181         }
 182
 183         free( connections );
 184         connections = NULL;
 185
 186         ldap_pvt_thread_mutex_destroy( &connections_mutex );
 187         ldap_pvt_thread_mutex_destroy( &conn_nextid_mutex );
 188         return 0;
 189 }
 190
 191 /*
 192  * shutdown all connections
 193  */
 194 int connections_shutdown(void)
 195 {
 196         ber_socket_t i;
 197
 198         for ( i = 0; i < dtblsize; i++ ) {
 199                 if( connections[i].c_struct_state != SLAP_C_UNINITIALIZED ) {
 200                         ldap_pvt_thread_mutex_lock( &connections[i].c_mutex );
 201                         if( connections[i].c_struct_state == SLAP_C_USED ) {
 202
 203                                 /* give persistent clients a chance to cleanup */
 204                                 if( connections[i].c_conn_state == SLAP_C_CLIENT ) {
 205                                         ldap_pvt_thread_pool_submit( &connection_pool,
 206                                         connections[i].c_clientfunc, connections[i].c_clientarg );
 207                                 } else {
 208                                         /* c_mutex is locked */
 209                                         connection_closing( &connections[i], "slapd shutdown" );
 210                                         connection_close( &connections[i] );
 211                                 }
 212                         }
 213                         ldap_pvt_thread_mutex_unlock( &connections[i].c_mutex );
 214                 }
 215         }
 216
 217         return 0;
 218 }
 219
 220 /*
 221  * Timeout idle connections.
 222  */
 223 int connections_timeout_idle(time_t now)
 224 {
 225         int i = 0;
 226         int connindex;
 227         Connection* c;
 228
 229         for( c = connection_first( &connindex );
 230                 c != NULL;
 231                 c = connection_next( c, &connindex ) )
 232         {
 233                 /* Don't timeout a slow-running request or a persistent
 234                  * outbound connection */
 235                 if( c->c_n_ops_executing || c->c_conn_state == SLAP_C_CLIENT ) {
 236                         continue;
 237                 }
 238
 239                 if( difftime( c->c_activitytime+global_idletimeout, now) < 0 ) {
 240                         /* close it */
 241                         connection_closing( c, "idletimeout" );
 242                         connection_close( c );
 243                         i++;
 244                 }
 245         }
 246         connection_done( c );
 247
 248         return i;
 249 }
 250
 251 static Connection* connection_get( ber_socket_t s )
 252 {
 253         Connection *c;
 254
 255         Debug( LDAP_DEBUG_ARGS,
 256                 "connection_get(%ld)\n",
 257                 (long) s, 0, 0 );
 258
 259         assert( connections != NULL );
 260
 261         if(s == AC_SOCKET_INVALID) return NULL;
 262
 263 #ifndef HAVE_WINSOCK
 264         assert( s < dtblsize );
 265         c = &connections[s];
 266
 267 #else
 268         c = NULL;
 269         {
 270                 ber_socket_t i, sd;
 271
 272                 ldap_pvt_thread_mutex_lock( &connections_mutex );
 273                 for(i=0; i<dtblsize; i++) {
 274                         if( connections[i].c_struct_state == SLAP_C_PENDING )
 275                                 continue;
 276
 277                         if( connections[i].c_struct_state == SLAP_C_UNINITIALIZED ) {
 278                                 assert( connections[i].c_conn_state == SLAP_C_INVALID );
 279                                 assert( connections[i].c_sb == 0 );
 280                                 break;
 281                         }
 282
 283                         ber_sockbuf_ctrl( connections[i].c_sb,
 284                                 LBER_SB_OPT_GET_FD, &sd );
 285
 286                         if( connections[i].c_struct_state == SLAP_C_UNUSED ) {
 287                                 assert( connections[i].c_conn_state == SLAP_C_INVALID );
 288                                 assert( sd == AC_SOCKET_INVALID );
 289                                 continue;
 290                         }
 291
 292                         /* state can actually change from used -> unused by resched,
 293                          * so don't assert details here.
 294                          */
 295
 296                         if( sd == s ) {
 297                                 c = &connections[i];
 298                                 break;
 299                         }
 300                 }
 301                 ldap_pvt_thread_mutex_unlock( &connections_mutex );
 302         }
 303 #endif
 304
 305         if( c != NULL ) {
 306                 ber_socket_t    sd;
 307
 308                 ldap_pvt_thread_mutex_lock( &c->c_mutex );
 309
 310                 assert( c->c_struct_state != SLAP_C_UNINITIALIZED );
 311
 312                 ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_GET_FD, &sd );
 313                 if( c->c_struct_state != SLAP_C_USED ) {
 314                         /* connection must have been closed due to resched */
 315
 316                         assert( c->c_conn_state == SLAP_C_INVALID );
 317                         assert( sd == AC_SOCKET_INVALID );
 318
 319                         Debug( LDAP_DEBUG_TRACE,
 320                                 "connection_get(%d): connection not used\n",
 321                                 s, 0, 0 );
 322
 323                         ldap_pvt_thread_mutex_unlock( &c->c_mutex );
 324                         return NULL;
 325                 }
 326
 327                 Debug( LDAP_DEBUG_TRACE,
 328                         "connection_get(%d): got connid=%lu\n",
 329                         s, c->c_connid, 0 );
 330
 331                 c->c_n_get++;
 332
 333                 assert( c->c_struct_state == SLAP_C_USED );
 334                 assert( c->c_conn_state != SLAP_C_INVALID );
 335                 assert( sd != AC_SOCKET_INVALID );
 336
 337 #ifndef SLAPD_MONITOR
 338                 if ( global_idletimeout > 0 )
 339 #endif /* ! SLAPD_MONITOR */
 340                 {
 341                         c->c_activitytime = slap_get_time();
 342                 }
 343         }
 344
 345         return c;
 346 }
 347
 348 static void connection_return( Connection *c )
 349 {
 350         ldap_pvt_thread_mutex_unlock( &c->c_mutex );
 351 }
 352
 353 long connection_init(
 354         ber_socket_t s,
 355         Listener *listener,
 356         const char* dnsname,
 357         const char* peername,
 358         int flags,
 359         slap_ssf_t ssf,
 360         struct berval *authid )
 361 {
 362         unsigned long id;
 363         Connection *c;
 364         int doinit = 0;
 365
 366         assert( connections != NULL );
 367
 368         assert( listener != NULL );
 369         assert( dnsname != NULL );
 370         assert( peername != NULL );
 371
 372 #ifndef HAVE_TLS
 373         assert( flags != CONN_IS_TLS );
 374 #endif
 375
 376         if( s == AC_SOCKET_INVALID ) {
 377                 Debug( LDAP_DEBUG_ANY,
 378                         "connection_init: init of socket %ld invalid.\n", (long)s, 0, 0 );
 379                 return -1;
 380         }
 381
 382         assert( s >= 0 );
 383 #ifndef HAVE_WINSOCK
 384         assert( s < dtblsize );
 385         c = &connections[s];
 386         if( c->c_struct_state == SLAP_C_UNINITIALIZED ) {
 387                 doinit = 1;
 388         } else {
 389                 assert( c->c_struct_state == SLAP_C_UNUSED );
 390         }
 391 #else
 392         {
 393                 ber_socket_t i;
 394                 c = NULL;
 395
 396                 ldap_pvt_thread_mutex_lock( &connections_mutex );
 397                 for( i=0; i < dtblsize; i++) {
 398                         ber_socket_t    sd;
 399
 400                         if ( connections[i].c_struct_state == SLAP_C_PENDING )
 401                                 continue;
 402
 403                         if( connections[i].c_struct_state == SLAP_C_UNINITIALIZED ) {
 404                                 assert( connections[i].c_sb == 0 );
 405                                 c = &connections[i];
 406                                 c->c_struct_state = SLAP_C_PENDING;
 407                                 doinit = 1;
 408                                 break;
 409                         }
 410
 411                         sd = AC_SOCKET_INVALID;
 412                         if (connections[i].c_sb != NULL) {
 413                                 ber_sockbuf_ctrl( connections[i].c_sb,
 414                                         LBER_SB_OPT_GET_FD, &sd );
 415                         }
 416
 417                         if( connections[i].c_struct_state == SLAP_C_UNUSED ) {
 418                                 assert( sd == AC_SOCKET_INVALID );
 419                                 c = &connections[i];
 420                                 c->c_struct_state = SLAP_C_PENDING;
 421                                 break;
 422                         }
 423
 424                         if( connections[i].c_conn_state == SLAP_C_CLIENT ) continue;
 425
 426                         assert( connections[i].c_struct_state == SLAP_C_USED );
 427                         assert( connections[i].c_conn_state != SLAP_C_INVALID );
 428                         assert( sd != AC_SOCKET_INVALID );
 429                 }
 430                 ldap_pvt_thread_mutex_unlock( &connections_mutex );
 431
 432                 if( c == NULL ) {
 433                         Debug( LDAP_DEBUG_ANY,
 434                                 "connection_init(%d): connection table full "
 435                                 "(%d/%d)\n", s, i, dtblsize);
 436                         return -1;
 437                 }
 438         }
 439 #endif
 440
 441         if( doinit ) {
 442                 c->c_send_ldap_result = slap_send_ldap_result;
 443                 c->c_send_search_entry = slap_send_search_entry;
 444                 c->c_send_search_reference = slap_send_search_reference;
 445                 c->c_send_ldap_extended = slap_send_ldap_extended;
 446                 c->c_send_ldap_intermediate = slap_send_ldap_intermediate;
 447
 448                 BER_BVZERO( &c->c_authmech );
 449                 BER_BVZERO( &c->c_dn );
 450                 BER_BVZERO( &c->c_ndn );
 451
 452                 c->c_listener = NULL;
 453                 BER_BVZERO( &c->c_peer_domain );
 454                 BER_BVZERO( &c->c_peer_name );
 455
 456                 LDAP_STAILQ_INIT(&c->c_ops);
 457                 LDAP_STAILQ_INIT(&c->c_pending_ops);
 458
 459 #ifdef LDAP_X_TXN
 460                 c->c_txn = CONN_TXN_INACTIVE;
 461                 c->c_txn_backend = NULL;
 462                 LDAP_STAILQ_INIT(&c->c_txn_ops);
 463 #endif
 464
 465                 BER_BVZERO( &c->c_sasl_bind_mech );
 466                 c->c_sasl_done = 0;
 467                 c->c_sasl_authctx = NULL;
 468                 c->c_sasl_sockctx = NULL;
 469                 c->c_sasl_extra = NULL;
 470                 c->c_sasl_bindop = NULL;
 471
 472                 c->c_sb = ber_sockbuf_alloc( );
 473
 474                 {
 475                         ber_len_t max = sockbuf_max_incoming;
 476                         ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_SET_MAX_INCOMING, &max );
 477                 }
 478
 479                 c->c_currentber = NULL;
 480
 481                 /* should check status of thread calls */
 482                 ldap_pvt_thread_mutex_init( &c->c_mutex );
 483                 ldap_pvt_thread_mutex_init( &c->c_write_mutex );
 484                 ldap_pvt_thread_cond_init( &c->c_write_cv );
 485
 486 #ifdef LDAP_SLAPI
 487                 if ( slapi_plugins_used ) {
 488                         slapi_int_create_object_extensions( SLAPI_X_EXT_CONNECTION, c );
 489                 }
 490 #endif
 491         }
 492
 493         ldap_pvt_thread_mutex_lock( &c->c_mutex );
 494
 495         assert( BER_BVISNULL( &c->c_authmech ) );
 496         assert( BER_BVISNULL( &c->c_dn ) );
 497         assert( BER_BVISNULL( &c->c_ndn ) );
 498         assert( c->c_listener == NULL );
 499         assert( BER_BVISNULL( &c->c_peer_domain ) );
 500         assert( BER_BVISNULL( &c->c_peer_name ) );
 501         assert( LDAP_STAILQ_EMPTY(&c->c_ops) );
 502         assert( LDAP_STAILQ_EMPTY(&c->c_pending_ops) );
 503 #ifdef LDAP_X_TXN
 504         assert( c->c_txn == CONN_TXN_INACTIVE );
 505         assert( c->c_txn_backend == NULL );
 506         assert( LDAP_STAILQ_EMPTY(&c->c_txn_ops) );
 507 #endif
 508         assert( BER_BVISNULL( &c->c_sasl_bind_mech ) );
 509         assert( c->c_sasl_done == 0 );
 510         assert( c->c_sasl_authctx == NULL );
 511         assert( c->c_sasl_sockctx == NULL );
 512         assert( c->c_sasl_extra == NULL );
 513         assert( c->c_sasl_bindop == NULL );
 514         assert( c->c_currentber == NULL );
 515         assert( c->c_writewaiter == 0);
 516
 517         c->c_listener = listener;
 518
 519         if ( flags == CONN_IS_CLIENT ) {
 520                 c->c_conn_state = SLAP_C_CLIENT;
 521                 c->c_struct_state = SLAP_C_USED;
 522                 c->c_close_reason = "?";                        /* should never be needed */
 523                 ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_SET_FD, &s );
 524                 ldap_pvt_thread_mutex_unlock( &c->c_mutex );
 525
 526                 return 0;
 527         }
 528
 529         ber_str2bv( dnsname, 0, 1, &c->c_peer_domain );
 530         ber_str2bv( peername, 0, 1, &c->c_peer_name );
 531
 532         c->c_n_ops_received = 0;
 533         c->c_n_ops_executing = 0;
 534         c->c_n_ops_pending = 0;
 535         c->c_n_ops_completed = 0;
 536
 537         c->c_n_get = 0;
 538         c->c_n_read = 0;
 539         c->c_n_write = 0;
 540
 541         /* set to zero until bind, implies LDAP_VERSION3 */
 542         c->c_protocol = 0;
 543
 544 #ifndef SLAPD_MONITOR
 545         if ( global_idletimeout > 0 )
 546 #endif /* ! SLAPD_MONITOR */
 547         {
 548                 c->c_activitytime = c->c_starttime = slap_get_time();
 549         }
 550
 551 #ifdef LDAP_CONNECTIONLESS
 552         c->c_is_udp = 0;
 553         if( flags == CONN_IS_UDP ) {
 554                 c->c_is_udp = 1;
 555 #ifdef LDAP_DEBUG
 556                 ber_sockbuf_add_io( c->c_sb, &ber_sockbuf_io_debug,
 557                         LBER_SBIOD_LEVEL_PROVIDER, (void*)"udp_" );
 558 #endif
 559                 ber_sockbuf_add_io( c->c_sb, &ber_sockbuf_io_udp,
 560                         LBER_SBIOD_LEVEL_PROVIDER, (void *)&s );
 561                 ber_sockbuf_add_io( c->c_sb, &ber_sockbuf_io_readahead,
 562                         LBER_SBIOD_LEVEL_PROVIDER, NULL );
 563         } else
 564 #endif
 565         {
 566 #ifdef LDAP_DEBUG
 567                 ber_sockbuf_add_io( c->c_sb, &ber_sockbuf_io_debug,
 568                         LBER_SBIOD_LEVEL_PROVIDER, (void*)"tcp_" );
 569 #endif
 570                 ber_sockbuf_add_io( c->c_sb, &ber_sockbuf_io_tcp,
 571                         LBER_SBIOD_LEVEL_PROVIDER, (void *)&s );
 572         }
 573
 574 #ifdef LDAP_DEBUG
 575         ber_sockbuf_add_io( c->c_sb, &ber_sockbuf_io_debug,
 576                 INT_MAX, (void*)"ldap_" );
 577 #endif
 578
 579         if( ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_SET_NONBLOCK,
 580                 c /* non-NULL */ ) < 0 )
 581         {
 582                 Debug( LDAP_DEBUG_ANY,
 583                         "connection_init(%d, %s): set nonblocking failed\n",
 584                         s, c->c_peer_name.bv_val, 0 );
 585         }
 586
 587         ldap_pvt_thread_mutex_lock( &conn_nextid_mutex );
 588         id = c->c_connid = conn_nextid++;
 589         ldap_pvt_thread_mutex_unlock( &conn_nextid_mutex );
 590
 591         c->c_conn_state = SLAP_C_INACTIVE;
 592         c->c_struct_state = SLAP_C_USED;
 593         c->c_close_reason = "?";                        /* should never be needed */
 594
 595         c->c_ssf = c->c_transport_ssf = ssf;
 596         c->c_tls_ssf = 0;
 597
 598 #ifdef HAVE_TLS
 599         if ( flags == CONN_IS_TLS ) {
 600                 c->c_is_tls = 1;
 601                 c->c_needs_tls_accept = 1;
 602         } else {
 603                 c->c_is_tls = 0;
 604                 c->c_needs_tls_accept = 0;
 605         }
 606 #endif
 607
 608         slap_sasl_open( c, 0 );
 609         slap_sasl_external( c, ssf, authid );
 610
 611         slapd_add_internal( s, 1 );
 612         ldap_pvt_thread_mutex_unlock( &c->c_mutex );
 613
 614         backend_connection_init(c);
 615
 616         return id;
 617 }
 618
 619 void connection2anonymous( Connection *c )
 620 {
 621         assert( connections != NULL );
 622         assert( c != NULL );
 623
 624         {
 625                 ber_len_t max = sockbuf_max_incoming;
 626                 ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_SET_MAX_INCOMING, &max );
 627         }
 628
 629         if ( !BER_BVISNULL( &c->c_authmech ) ) {
 630                 ch_free(c->c_authmech.bv_val);
 631         }
 632         BER_BVZERO( &c->c_authmech );
 633
 634         if ( !BER_BVISNULL( &c->c_dn ) ) {
 635                 ch_free(c->c_dn.bv_val);
 636         }
 637         BER_BVZERO( &c->c_dn );
 638
 639         if ( !BER_BVISNULL( &c->c_ndn ) ) {
 640                 ch_free(c->c_ndn.bv_val);
 641         }
 642         BER_BVZERO( &c->c_ndn );
 643
 644         if ( !BER_BVISNULL( &c->c_sasl_authz_dn ) ) {
 645                 ber_memfree_x( c->c_sasl_authz_dn.bv_val, NULL );
 646         }
 647         BER_BVZERO( &c->c_sasl_authz_dn );
 648
 649         c->c_authz_backend = NULL;
 650 }
 651
 652 static void
 653 connection_destroy( Connection *c )
 654 {
 655         ber_socket_t    sd;
 656         unsigned long   connid;
 657         const char              *close_reason;
 658         Sockbuf                 *sb;
 659
 660         assert( connections != NULL );
 661         assert( c != NULL );
 662         assert( c->c_struct_state != SLAP_C_UNUSED );
 663         assert( c->c_conn_state != SLAP_C_INVALID );
 664         assert( LDAP_STAILQ_EMPTY(&c->c_ops) );
 665         assert( LDAP_STAILQ_EMPTY(&c->c_pending_ops) );
 666 #ifdef LDAP_X_TXN
 667         assert( c->c_txn == CONN_TXN_INACTIVE );
 668         assert( c->c_txn_backend == NULL );
 669         assert( LDAP_STAILQ_EMPTY(&c->c_txn_ops) );
 670 #endif
 671         assert( c->c_writewaiter == 0);
 672
 673         /* only for stats (print -1 as "%lu" may give unexpected results ;) */
 674         connid = c->c_connid;
 675         close_reason = c->c_close_reason;
 676
 677         ldap_pvt_thread_mutex_lock( &connections_mutex );
 678         c->c_struct_state = SLAP_C_PENDING;
 679         ldap_pvt_thread_mutex_unlock( &connections_mutex );
 680
 681         backend_connection_destroy(c);
 682
 683         c->c_protocol = 0;
 684         c->c_connid = -1;
 685
 686         c->c_activitytime = c->c_starttime = 0;
 687
 688         connection2anonymous( c );
 689         c->c_listener = NULL;
 690
 691         if(c->c_peer_domain.bv_val != NULL) {
 692                 free(c->c_peer_domain.bv_val);
 693         }
 694         BER_BVZERO( &c->c_peer_domain );
 695         if(c->c_peer_name.bv_val != NULL) {
 696                 free(c->c_peer_name.bv_val);
 697         }
 698         BER_BVZERO( &c->c_peer_name );
 699
 700         c->c_sasl_bind_in_progress = 0;
 701         if(c->c_sasl_bind_mech.bv_val != NULL) {
 702                 free(c->c_sasl_bind_mech.bv_val);
 703         }
 704         BER_BVZERO( &c->c_sasl_bind_mech );
 705
 706         slap_sasl_close( c );
 707
 708         if ( c->c_currentber != NULL ) {
 709                 ber_free( c->c_currentber, 1 );
 710                 c->c_currentber = NULL;
 711         }
 712
 713
 714 #ifdef LDAP_SLAPI
 715         /* call destructors, then constructors; avoids unnecessary allocation */
 716         if ( slapi_plugins_used ) {
 717                 slapi_int_clear_object_extensions( SLAPI_X_EXT_CONNECTION, c );
 718         }
 719 #endif
 720
 721         c->c_conn_state = SLAP_C_INVALID;
 722         c->c_struct_state = SLAP_C_UNUSED;
 723         c->c_close_reason = "?";                        /* should never be needed */
 724
 725         sb = c->c_sb;
 726         c->c_sb = ber_sockbuf_alloc( );
 727         {
 728                 ber_len_t max = sockbuf_max_incoming;
 729                 ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_SET_MAX_INCOMING, &max );
 730         }
 731
 732         ber_sockbuf_ctrl( sb, LBER_SB_OPT_GET_FD, &sd );
 733
 734         /* c must be fully reset by this point; when we call slapd_remove
 735          * it may get immediately reused by a new connection.
 736          */
 737         if ( sd != AC_SOCKET_INVALID ) {
 738                 slapd_remove( sd, sb, 1, 0, 0 );
 739
 740                 if ( close_reason == NULL ) {
 741                         close_reason = "";
 742                 }
 743
 744                 Statslog( LDAP_DEBUG_STATS, "conn=%lu fd=%ld closed (%s)\n",
 745                         connid, (long) sd, close_reason, 0, 0 );
 746         }
 747 }
 748
 749 int connection_state_closing( Connection *c )
 750 {
 751         /* c_mutex must be locked by caller */
 752
 753         int state;
 754         assert( c != NULL );
 755         assert( c->c_struct_state == SLAP_C_USED );
 756
 757         state = c->c_conn_state;
 758
 759         assert( state != SLAP_C_INVALID );
 760
 761         return state == SLAP_C_CLOSING;
 762 }
 763
 764 static void connection_abandon( Connection *c )
 765 {
 766         /* c_mutex must be locked by caller */
 767
 768         Operation *o, *next, op = {0};
 769         Opheader ohdr = {0};
 770         SlapReply rs = {0};
 771
 772         op.o_hdr = &ohdr;
 773         op.o_conn = c;
 774         op.o_connid = c->c_connid;
 775         op.o_tag = LDAP_REQ_ABANDON;
 776
 777         for ( o = LDAP_STAILQ_FIRST( &c->c_ops ); o; o=next ) {
 778                 next = LDAP_STAILQ_NEXT( o, o_next );
 779                 op.orn_msgid = o->o_msgid;
 780                 o->o_abandon = 1;
 781                 op.o_bd = frontendDB;
 782                 frontendDB->be_abandon( &op, &rs );
 783         }
 784
 785 #ifdef LDAP_X_TXN
 786         /* remove operations in pending transaction */
 787         while ( (o = LDAP_STAILQ_FIRST( &c->c_txn_ops )) != NULL) {
 788                 LDAP_STAILQ_REMOVE_HEAD( &c->c_txn_ops, o_next );
 789                 LDAP_STAILQ_NEXT(o, o_next) = NULL;
 790                 slap_op_free( o );
 791         }
 792
 793         /* clear transaction */
 794         c->c_txn_backend = NULL;
 795         c->c_txn = CONN_TXN_INACTIVE;
 796 #endif
 797
 798         /* remove pending operations */
 799         while ( (o = LDAP_STAILQ_FIRST( &c->c_pending_ops )) != NULL) {
 800                 LDAP_STAILQ_REMOVE_HEAD( &c->c_pending_ops, o_next );
 801                 LDAP_STAILQ_NEXT(o, o_next) = NULL;
 802                 slap_op_free( o );
 803         }
 804 }
 805
 806 void connection_closing( Connection *c, const char *why )
 807 {
 808         assert( connections != NULL );
 809         assert( c != NULL );
 810         assert( c->c_struct_state == SLAP_C_USED );
 811         assert( c->c_conn_state != SLAP_C_INVALID );
 812
 813         /* c_mutex must be locked by caller */
 814
 815         if( c->c_conn_state != SLAP_C_CLOSING ) {
 816                 ber_socket_t    sd;
 817
 818                 ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_GET_FD, &sd );
 819                 Debug( LDAP_DEBUG_TRACE,
 820                         "connection_closing: readying conn=%lu sd=%d for close\n",
 821                         c->c_connid, sd, 0 );
 822                 /* update state to closing */
 823                 c->c_conn_state = SLAP_C_CLOSING;
 824                 c->c_close_reason = why;
 825
 826                 /* don't listen on this port anymore */
 827                 slapd_clr_read( sd, 0 );
 828
 829                 /* abandon active operations */
 830                 connection_abandon( c );
 831
 832                 /* wake write blocked operations */
 833                 if ( c->c_writewaiter ) {
 834                         ldap_pvt_thread_cond_signal( &c->c_write_cv );
 835                         /* ITS#4667 this may allow another thread to drop into
 836                          * connection_resched / connection_close before we
 837                          * finish, but that's OK.
 838                          */
 839                         slapd_clr_write( sd, 1 );
 840                         ldap_pvt_thread_mutex_unlock( &c->c_mutex );
 841                         ldap_pvt_thread_mutex_lock( &c->c_write_mutex );
 842                         ldap_pvt_thread_mutex_lock( &c->c_mutex );
 843                         ldap_pvt_thread_mutex_unlock( &c->c_write_mutex );
 844                 } else {
 845                         slapd_clr_write( sd, 1 );
 846                 }
 847
 848         } else if( why == NULL && c->c_close_reason == conn_lost_str ) {
 849                 /* Client closed connection after doing Unbind. */
 850                 c->c_close_reason = NULL;
 851         }
 852 }
 853
 854 static void
 855 connection_close( Connection *c )
 856 {
 857         ber_socket_t    sd = AC_SOCKET_INVALID;
 858
 859         assert( connections != NULL );
 860         assert( c != NULL );
 861
 862         /* ITS#4667 we may have gotten here twice */
 863         if ( c->c_conn_state == SLAP_C_INVALID )
 864                 return;
 865
 866         assert( c->c_struct_state == SLAP_C_USED );
 867         assert( c->c_conn_state == SLAP_C_CLOSING );
 868
 869         /* NOTE: c_mutex should be locked by caller */
 870
 871         /* NOTE: don't get the file descriptor if not needed */
 872         if ( LogTest( LDAP_DEBUG_TRACE ) ) {
 873                 ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_GET_FD, &sd );
 874         }
 875
 876         if ( !LDAP_STAILQ_EMPTY(&c->c_ops) ||
 877                 !LDAP_STAILQ_EMPTY(&c->c_pending_ops) )
 878         {
 879                 Debug( LDAP_DEBUG_TRACE,
 880                         "connection_close: deferring conn=%lu sd=%d\n",
 881                         c->c_connid, sd, 0 );
 882                 return;
 883         }
 884
 885         Debug( LDAP_DEBUG_TRACE, "connection_close: conn=%lu sd=%d\n",
 886                 c->c_connid, sd, 0 );
 887
 888         connection_destroy( c );
 889 }
 890
 891 unsigned long connections_nextid(void)
 892 {
 893         unsigned long id;
 894         assert( connections != NULL );
 895
 896         ldap_pvt_thread_mutex_lock( &conn_nextid_mutex );
 897
 898         id = conn_nextid;
 899
 900         ldap_pvt_thread_mutex_unlock( &conn_nextid_mutex );
 901
 902         return id;
 903 }
 904
 905 Connection* connection_first( ber_socket_t *index )
 906 {
 907         assert( connections != NULL );
 908         assert( index != NULL );
 909
 910         ldap_pvt_thread_mutex_lock( &connections_mutex );
 911         for( *index = 0; *index < dtblsize; (*index)++) {
 912                 if( connections[*index].c_struct_state != SLAP_C_UNINITIALIZED ) {
 913                         break;
 914                 }
 915         }
 916         ldap_pvt_thread_mutex_unlock( &connections_mutex );
 917
 918         return connection_next(NULL, index);
 919 }
 920
 921 Connection* connection_next( Connection *c, ber_socket_t *index )
 922 {
 923         assert( connections != NULL );
 924         assert( index != NULL );
 925         assert( *index <= dtblsize );
 926
 927         if( c != NULL ) ldap_pvt_thread_mutex_unlock( &c->c_mutex );
 928
 929         c = NULL;
 930
 931         ldap_pvt_thread_mutex_lock( &connections_mutex );
 932         for(; *index < dtblsize; (*index)++) {
 933                 int c_struct;
 934                 if( connections[*index].c_struct_state == SLAP_C_UNINITIALIZED ) {
 935                         assert( connections[*index].c_conn_state == SLAP_C_INVALID );
 936 #ifdef HAVE_WINSOCK
 937                         break;
 938 #else
 939                         continue;
 940 #endif
 941                 }
 942
 943                 if( connections[*index].c_struct_state == SLAP_C_USED ) {
 944                         assert( connections[*index].c_conn_state != SLAP_C_INVALID );
 945                         c = &connections[(*index)++];
 946                         if ( ldap_pvt_thread_mutex_trylock( &c->c_mutex )) {
 947                                 /* avoid deadlock */
 948                                 ldap_pvt_thread_mutex_unlock( &connections_mutex );
 949                                 ldap_pvt_thread_mutex_lock( &c->c_mutex );
 950                                 ldap_pvt_thread_mutex_lock( &connections_mutex );
 951                                 if ( c->c_struct_state != SLAP_C_USED ) {
 952                                         ldap_pvt_thread_mutex_unlock( &c->c_mutex );
 953                                         c = NULL;
 954                                         continue;
 955                                 }
 956                         }
 957                         break;
 958                 }
 959
 960                 c_struct = connections[*index].c_struct_state;
 961                 if ( c_struct == SLAP_C_PENDING )
 962                         continue;
 963                 assert( c_struct == SLAP_C_UNUSED );
 964                 assert( connections[*index].c_conn_state == SLAP_C_INVALID );
 965         }
 966
 967         ldap_pvt_thread_mutex_unlock( &connections_mutex );
 968         return c;
 969 }
 970
 971 void connection_done( Connection *c )
 972 {
 973         assert( connections != NULL );
 974
 975         if( c != NULL ) ldap_pvt_thread_mutex_unlock( &c->c_mutex );
 976 }
 977
 978 /*
 979  * connection_activity - handle the request operation op on connection
 980  * conn.  This routine figures out what kind of operation it is and
 981  * calls the appropriate stub to handle it.
 982  */
 983
 984 #ifdef SLAPD_MONITOR
 985 /* FIXME: returns 0 in case of failure */
 986 #define INCR_OP_INITIATED(index) \
 987         do { \
 988                 ldap_pvt_thread_mutex_lock( &slap_counters.sc_ops_mutex ); \
 989                 ldap_pvt_mp_add_ulong(slap_counters.sc_ops_initiated_[(index)], 1); \
 990                 ldap_pvt_thread_mutex_unlock( &slap_counters.sc_ops_mutex ); \
 991         } while (0)
 992 #define INCR_OP_COMPLETED(index) \
 993         do { \
 994                 ldap_pvt_thread_mutex_lock( &slap_counters.sc_ops_mutex ); \
 995                 ldap_pvt_mp_add_ulong(slap_counters.sc_ops_completed, 1); \
 996                 ldap_pvt_mp_add_ulong(slap_counters.sc_ops_completed_[(index)], 1); \
 997                 ldap_pvt_thread_mutex_unlock( &slap_counters.sc_ops_mutex ); \
 998         } while (0)
 999 #else /* !SLAPD_MONITOR */
1000 #define INCR_OP_INITIATED(index) do { } while (0)
1001 #define INCR_OP_COMPLETED(index) \
1002         do { \
1003                 ldap_pvt_thread_mutex_lock( &slap_counters.sc_ops_mutex ); \
1004                 ldap_pvt_mp_add_ulong(slap_counters.sc_ops_completed, 1); \
1005                 ldap_pvt_thread_mutex_unlock( &slap_counters.sc_ops_mutex ); \
1006         } while (0)
1007 #endif /* !SLAPD_MONITOR */
1008
1009 /*
1010  * NOTE: keep in sync with enum in slapd.h
1011  */
1012 static BI_op_func *opfun[] = {
1013         do_bind,
1014         do_unbind,
1015         do_add,
1016         do_delete,
1017         do_modrdn,
1018         do_modify,
1019         do_compare,
1020         do_search,
1021         do_abandon,
1022         do_extended,
1023         NULL
1024 };
1025
1026 static void *
1027 connection_operation( void *ctx, void *arg_v )
1028 {
1029         int rc = LDAP_OTHER;
1030         Operation *op = arg_v;
1031         SlapReply rs = {REP_RESULT};
1032         ber_tag_t tag = op->o_tag;
1033         slap_op_t opidx = SLAP_OP_LAST;
1034         Connection *conn = op->o_conn;
1035         void *memctx = NULL;
1036         void *memctx_null = NULL;
1037         ber_len_t memsiz;
1038
1039         ldap_pvt_thread_mutex_lock( &slap_counters.sc_ops_mutex );
1040         /* FIXME: returns 0 in case of failure */
1041         ldap_pvt_mp_add_ulong(slap_counters.sc_ops_initiated, 1);
1042         ldap_pvt_thread_mutex_unlock( &slap_counters.sc_ops_mutex );
1043
1044         op->o_threadctx = ctx;
1045         op->o_tid = ldap_pvt_thread_pool_tid( ctx );
1046
1047         switch ( tag ) {
1048         case LDAP_REQ_BIND:
1049         case LDAP_REQ_UNBIND:
1050         case LDAP_REQ_ADD:
1051         case LDAP_REQ_DELETE:
1052         case LDAP_REQ_MODDN:
1053         case LDAP_REQ_MODIFY:
1054         case LDAP_REQ_COMPARE:
1055         case LDAP_REQ_SEARCH:
1056         case LDAP_REQ_ABANDON:
1057         case LDAP_REQ_EXTENDED:
1058                 break;
1059         default:
1060                 Debug( LDAP_DEBUG_ANY, "connection_operation: "
1061                         "conn %lu unknown LDAP request 0x%lx\n",
1062                         conn->c_connid, tag, 0 );
1063                 op->o_tag = LBER_ERROR;
1064                 rs.sr_err = LDAP_PROTOCOL_ERROR;
1065                 rs.sr_text = "unknown LDAP request";
1066                 send_ldap_disconnect( op, &rs );
1067                 rc = SLAPD_DISCONNECT;
1068                 goto operations_error;
1069         }
1070
1071         if( conn->c_sasl_bind_in_progress && tag != LDAP_REQ_BIND ) {
1072                 Debug( LDAP_DEBUG_ANY, "connection_operation: "
1073                         "error: SASL bind in progress (tag=%ld).\n",
1074                         (long) tag, 0, 0 );
1075                 send_ldap_error( op, &rs, LDAP_OPERATIONS_ERROR,
1076                         "SASL bind in progress" );
1077                 rc = LDAP_OPERATIONS_ERROR;
1078                 goto operations_error;
1079         }
1080
1081 #ifdef LDAP_X_TXN
1082         if (( conn->c_txn == CONN_TXN_SPECIFY ) && (
1083                 ( tag == LDAP_REQ_ADD ) ||
1084                 ( tag == LDAP_REQ_DELETE ) ||
1085                 ( tag == LDAP_REQ_MODIFY ) ||
1086                 ( tag == LDAP_REQ_MODRDN )))
1087         {
1088                 /* Disable SLAB allocator for all update operations
1089                         issued inside of a transaction */
1090                 op->o_tmpmemctx = NULL;
1091                 op->o_tmpmfuncs = &ch_mfuncs;
1092         } else
1093 #endif
1094         {
1095         /* We can use Thread-Local storage for most mallocs. We can
1096          * also use TL for ber parsing, but not on Add or Modify.
1097          */
1098 #if 0
1099         memsiz = ber_len( op->o_ber ) * 64;
1100         if ( SLAP_SLAB_SIZE > memsiz ) memsiz = SLAP_SLAB_SIZE;
1101 #endif
1102         memsiz = SLAP_SLAB_SIZE;
1103
1104         memctx = slap_sl_mem_create( memsiz, SLAP_SLAB_STACK, ctx );
1105         op->o_tmpmemctx = memctx;
1106         op->o_tmpmfuncs = &slap_sl_mfuncs;
1107         if ( tag != LDAP_REQ_ADD && tag != LDAP_REQ_MODIFY ) {
1108                 /* Note - the ber and its buffer are already allocated from
1109                  * regular memory; this only affects subsequent mallocs that
1110                  * ber_scanf may invoke.
1111                  */
1112                 ber_set_option( op->o_ber, LBER_OPT_BER_MEMCTX, &memctx );
1113         }
1114         }
1115
1116         opidx = slap_req2op( tag );
1117         assert( opidx != SLAP_OP_LAST );
1118         INCR_OP_INITIATED( opidx );
1119         rc = (*(opfun[opidx]))( op, &rs );
1120
1121 operations_error:
1122         if ( rc == SLAPD_DISCONNECT ) {
1123                 tag = LBER_ERROR;
1124
1125         } else if ( opidx != SLAP_OP_LAST ) {
1126                 /* increment completed operations count
1127                  * only if operation was initiated
1128                  * and rc != SLAPD_DISCONNECT */
1129                 INCR_OP_COMPLETED( opidx );
1130         }
1131
1132         if ( op->o_cancel == SLAP_CANCEL_REQ ) {
1133                 if ( rc == SLAPD_ABANDON ) {
1134                         op->o_cancel = SLAP_CANCEL_ACK;
1135                 } else {
1136                         op->o_cancel = LDAP_TOO_LATE;
1137                 }
1138         }
1139
1140         while ( op->o_cancel != SLAP_CANCEL_NONE &&
1141                 op->o_cancel != SLAP_CANCEL_DONE )
1142         {
1143                 ldap_pvt_thread_yield();
1144         }
1145
1146         ldap_pvt_thread_mutex_lock( &conn->c_mutex );
1147
1148         ber_set_option( op->o_ber, LBER_OPT_BER_MEMCTX, &memctx_null );
1149
1150         LDAP_STAILQ_REMOVE( &conn->c_ops, op, slap_op, o_next);
1151         LDAP_STAILQ_NEXT(op, o_next) = NULL;
1152         slap_op_free( op );
1153         conn->c_n_ops_executing--;
1154         conn->c_n_ops_completed++;
1155
1156         switch( tag ) {
1157         case LBER_ERROR:
1158         case LDAP_REQ_UNBIND:
1159                 /* c_mutex is locked */
1160                 connection_closing( conn,
1161                         tag == LDAP_REQ_UNBIND ? NULL : "operations error" );
1162                 break;
1163         }
1164
1165         connection_resched( conn );
1166         ldap_pvt_thread_mutex_unlock( &conn->c_mutex );
1167         return NULL;
1168 }
1169
1170 static const Listener dummy_list = { BER_BVC(""), BER_BVC("") };
1171
1172 int connection_client_setup(
1173         ber_socket_t s,
1174         ldap_pvt_thread_start_t *func,
1175         void *arg )
1176 {
1177         int rc;
1178         Connection *c;
1179
1180         rc = connection_init( s, (Listener *)&dummy_list, "", "",
1181                 CONN_IS_CLIENT, 0, NULL );
1182         if ( rc < 0 ) return -1;
1183
1184         c = connection_get( s );
1185         c->c_clientfunc = func;
1186         c->c_clientarg = arg;
1187
1188         slapd_add_internal( s, 0 );
1189         slapd_set_read( s, 1 );
1190         connection_return( c );
1191         return 0;
1192 }
1193
1194 void connection_client_enable(
1195         ber_socket_t s )
1196 {
1197         slapd_set_read( s, 1 );
1198 }
1199
1200 void connection_client_stop(
1201         ber_socket_t s )
1202 {
1203         Connection *c;
1204         Sockbuf *sb;
1205
1206         /* get (locked) connection */
1207         c = connection_get( s );
1208
1209         assert( c->c_conn_state == SLAP_C_CLIENT );
1210
1211         c->c_listener = NULL;
1212         c->c_conn_state = SLAP_C_INVALID;
1213         c->c_struct_state = SLAP_C_UNUSED;
1214         c->c_close_reason = "?";                        /* should never be needed */
1215         sb = c->c_sb;
1216         c->c_sb = ber_sockbuf_alloc( );
1217         {
1218                 ber_len_t max = sockbuf_max_incoming;
1219                 ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_SET_MAX_INCOMING, &max );
1220         }
1221         slapd_remove( s, sb, 0, 1, 0 );
1222
1223         connection_return( c );
1224 }
1225
1226 #ifdef SLAP_LIGHTWEIGHT_DISPATCHER
1227
1228 static int connection_read( ber_socket_t s, conn_readinfo *cri );
1229
1230 static void* connection_read_thread( void* ctx, void* argv )
1231 {
1232         int rc ;
1233         conn_readinfo cri = { NULL, NULL, NULL, 0 };
1234         ber_socket_t s = (long)argv;
1235
1236         /*
1237          * read incoming LDAP requests. If there is more than one,
1238          * the first one is returned with new_op
1239          */
1240         if( ( rc = connection_read( s, &cri ) ) < 0 ) {
1241                 Debug( LDAP_DEBUG_CONNS, "connection_read(%d) error\n", s, 0, 0 );
1242                 return (void*)(long)rc;
1243         }
1244
1245         /* execute a single queued request in the same thread */
1246         if( cri.op && !cri.nullop ) {
1247                 rc = (long)connection_operation( ctx, cri.op );
1248         } else if ( cri.func ) {
1249                 rc = (long)cri.func( ctx, cri.arg );
1250         }
1251
1252         return (void*)(long)rc;
1253 }
1254
1255 int connection_read_activate( ber_socket_t s )
1256 {
1257         int rc;
1258
1259         /*
1260          * suspend reading on this file descriptor until a connection processing
1261          * thread reads data on it. Otherwise the listener thread will repeatedly
1262          * submit the same event on it to the pool.
1263          */
1264         rc = slapd_clr_read( s, 0 );
1265         if ( rc )
1266                 return rc;
1267
1268         rc = ldap_pvt_thread_pool_submit( &connection_pool,
1269                 connection_read_thread, (void *)(long)s );
1270
1271         if( rc != 0 ) {
1272                 Debug( LDAP_DEBUG_ANY,
1273                         "connection_read_activate(%d): submit failed (%d)\n",
1274                         s, rc, 0 );
1275         }
1276
1277         return rc;
1278 }
1279 #endif
1280
1281 #ifdef SLAP_LIGHTWEIGHT_DISPATCHER
1282 static int
1283 connection_read( ber_socket_t s, conn_readinfo *cri )
1284 #else
1285 int connection_read(ber_socket_t s)
1286 #endif
1287 {
1288         int rc = 0;
1289         Connection *c;
1290
1291         assert( connections != NULL );
1292
1293         /* get (locked) connection */
1294         c = connection_get( s );
1295
1296         if( c == NULL ) {
1297                 Debug( LDAP_DEBUG_ANY,
1298                         "connection_read(%ld): no connection!\n",
1299                         (long) s, 0, 0 );
1300
1301                 return -1;
1302         }
1303
1304         c->c_n_read++;
1305
1306         if( c->c_conn_state == SLAP_C_CLOSING ) {
1307                 Debug( LDAP_DEBUG_TRACE,
1308                         "connection_read(%d): closing, ignoring input for id=%lu\n",
1309                         s, c->c_connid, 0 );
1310                 connection_return( c );
1311                 return 0;
1312         }
1313
1314         if ( c->c_conn_state == SLAP_C_CLIENT ) {
1315 #ifdef SLAP_LIGHTWEIGHT_DISPATCHER
1316                 cri->func = c->c_clientfunc;
1317                 cri->arg = c->c_clientarg;
1318                 /* read should already be cleared */
1319 #else
1320                 slapd_clr_read( s, 0 );
1321                 ldap_pvt_thread_pool_submit( &connection_pool,
1322                         c->c_clientfunc, c->c_clientarg );
1323 #endif
1324                 connection_return( c );
1325                 return 0;
1326         }
1327
1328         Debug( LDAP_DEBUG_TRACE,
1329                 "connection_read(%d): checking for input on id=%lu\n",
1330                 s, c->c_connid, 0 );
1331
1332 #ifdef HAVE_TLS
1333         if ( c->c_is_tls && c->c_needs_tls_accept ) {
1334                 rc = ldap_pvt_tls_accept( c->c_sb, slap_tls_ctx );
1335                 if ( rc < 0 ) {
1336                         Debug( LDAP_DEBUG_TRACE,
1337                                 "connection_read(%d): TLS accept failure "
1338                                 "error=%d id=%lu, closing\n",
1339                                 s, rc, c->c_connid );
1340
1341                         c->c_needs_tls_accept = 0;
1342                         /* c_mutex is locked */
1343                         connection_closing( c, "TLS negotiation failure" );
1344                         connection_close( c );
1345                         connection_return( c );
1346                         return 0;
1347
1348                 } else if ( rc == 0 ) {
1349                         void *ssl;
1350                         struct berval authid = BER_BVNULL;
1351
1352                         c->c_needs_tls_accept = 0;
1353
1354                         /* we need to let SASL know */
1355                         ssl = ldap_pvt_tls_sb_ctx( c->c_sb );
1356
1357                         c->c_tls_ssf = (slap_ssf_t) ldap_pvt_tls_get_strength( ssl );
1358                         if( c->c_tls_ssf > c->c_ssf ) {
1359                                 c->c_ssf = c->c_tls_ssf;
1360                         }
1361
1362                         rc = dnX509peerNormalize( ssl, &authid );
1363                         if ( rc != LDAP_SUCCESS ) {
1364                                 Debug( LDAP_DEBUG_TRACE, "connection_read(%d): "
1365                                         "unable to get TLS client DN, error=%d id=%lu\n",
1366                                         s, rc, c->c_connid );
1367                         }
1368                         Statslog( LDAP_DEBUG_STATS,
1369                                 "conn=%lu fd=%d TLS established tls_ssf=%u ssf=%u\n",
1370                             c->c_connid, (int) s, c->c_tls_ssf, c->c_ssf, 0 );
1371                         slap_sasl_external( c, c->c_tls_ssf, &authid );
1372                         if ( authid.bv_val ) free( authid.bv_val );
1373                 }
1374
1375                 /* if success and data is ready, fall thru to data input loop */
1376                 if( !ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_DATA_READY, NULL ) )
1377                 {
1378 #ifdef SLAP_LIGHTWEIGHT_DISPATCHER
1379                         slapd_set_read( s, 1 );
1380 #endif
1381
1382                         connection_return( c );
1383                         return 0;
1384                 }
1385         }
1386 #endif
1387
1388 #ifdef HAVE_CYRUS_SASL
1389         if ( c->c_sasl_layers ) {
1390                 /* If previous layer is not removed yet, give up for now */
1391                 if ( !c->c_sasl_sockctx ) {
1392 #ifdef SLAP_LIGHTWEIGHT_DISPATCHER
1393                         slapd_set_read( s, 1 );
1394 #endif
1395
1396                         connection_return( c );
1397                         return 0;
1398                 }
1399
1400                 c->c_sasl_layers = 0;
1401
1402                 rc = ldap_pvt_sasl_install( c->c_sb, c->c_sasl_sockctx );
1403                 if( rc != LDAP_SUCCESS ) {
1404                         Debug( LDAP_DEBUG_TRACE,
1405                                 "connection_read(%d): SASL install error "
1406                                 "error=%d id=%lu, closing\n",
1407                                 s, rc, c->c_connid );
1408
1409                         /* c_mutex is locked */
1410                         connection_closing( c, "SASL layer install failure" );
1411                         connection_close( c );
1412                         connection_return( c );
1413                         return 0;
1414                 }
1415         }
1416 #endif
1417
1418 #define CONNECTION_INPUT_LOOP 1
1419 /* #define      DATA_READY_LOOP 1 */
1420
1421         do {
1422                 /* How do we do this without getting into a busy loop ? */
1423 #ifdef SLAP_LIGHTWEIGHT_DISPATCHER
1424                 rc = connection_input( c, cri );
1425 #else
1426                 rc = connection_input( c );
1427 #endif
1428         }
1429 #ifdef DATA_READY_LOOP
1430         while( !rc && ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_DATA_READY, NULL ));
1431 #elif CONNECTION_INPUT_LOOP
1432         while(!rc);
1433 #else
1434         while(0);
1435 #endif
1436
1437         if( rc < 0 ) {
1438                 Debug( LDAP_DEBUG_CONNS,
1439                         "connection_read(%d): input error=%d id=%lu, closing.\n",
1440                         s, rc, c->c_connid );
1441
1442                 /* c_mutex is locked */
1443                 connection_closing( c, conn_lost_str );
1444                 connection_close( c );
1445                 connection_return( c );
1446                 return 0;
1447         }
1448
1449 #ifdef SLAP_LIGHTWEIGHT_DISPATCHER
1450         if ( ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_NEEDS_WRITE, NULL ) ) {
1451                 slapd_set_write( s, 0 );
1452         }
1453
1454         slapd_set_read( s, 1 );
1455 #else
1456         if ( ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_NEEDS_READ, NULL ) ) {
1457                 slapd_set_read( s, 1 );
1458         }
1459
1460         if ( ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_NEEDS_WRITE, NULL ) ) {
1461                 slapd_set_write( s, 1 );
1462         }
1463 #endif
1464
1465         connection_return( c );
1466
1467         return 0;
1468 }
1469
1470 static int
1471 #ifdef SLAP_LIGHTWEIGHT_DISPATCHER
1472 connection_input( Connection *conn , conn_readinfo *cri )
1473 #else
1474 connection_input( Connection *conn )
1475 #endif
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
1489         if ( conn->c_currentber == NULL &&
1490                 ( conn->c_currentber = ber_alloc()) == NULL )
1491         {
1492                 Debug( LDAP_DEBUG_ANY, "ber_alloc failed\n", 0, 0, 0 );
1493                 return -1;
1494         }
1495
1496         sock_errset(0);
1497
1498 #ifdef LDAP_CONNECTIONLESS
1499         if ( conn->c_is_udp ) {
1500                 char peername[sizeof("IP=255.255.255.255:65336")];
1501
1502                 len = ber_int_sb_read(conn->c_sb, &peeraddr, sizeof(struct sockaddr));
1503                 if (len != sizeof(struct sockaddr)) return 1;
1504
1505                 sprintf( peername, "IP=%s:%d",
1506                         inet_ntoa( peeraddr.sa_in_addr.sin_addr ),
1507                         (unsigned) ntohs( peeraddr.sa_in_addr.sin_port ) );
1508                 Statslog( LDAP_DEBUG_STATS,
1509                         "conn=%lu UDP request from %s (%s) accepted.\n",
1510                         conn->c_connid, peername, conn->c_sock_name.bv_val, 0, 0 );
1511         }
1512 #endif
1513
1514         tag = ber_get_next( conn->c_sb, &len, conn->c_currentber );
1515         if ( tag != LDAP_TAG_MESSAGE ) {
1516                 int err = sock_errno();
1517                 ber_socket_t    sd;
1518
1519                 ber_sockbuf_ctrl( conn->c_sb, LBER_SB_OPT_GET_FD, &sd );
1520
1521                 Debug( LDAP_DEBUG_TRACE,
1522                         "ber_get_next on fd %d failed errno=%d (%s)\n",
1523                         sd, err, sock_errstr(err) );
1524                 if ( err != EWOULDBLOCK && err != EAGAIN ) {
1525                         /* log, close and send error */
1526                         ber_free( conn->c_currentber, 1 );
1527                         conn->c_currentber = NULL;
1528
1529                         return -2;
1530                 }
1531                 return 1;
1532         }
1533
1534         ber = conn->c_currentber;
1535         conn->c_currentber = NULL;
1536
1537         if ( (tag = ber_get_int( ber, &msgid )) != LDAP_TAG_MSGID ) {
1538                 /* log, close and send error */
1539                 Debug( LDAP_DEBUG_ANY, "ber_get_int returns 0x%lx\n", tag, 0, 0 );
1540                 ber_free( ber, 1 );
1541                 return -1;
1542         }
1543
1544         if ( (tag = ber_peek_tag( ber, &len )) == LBER_ERROR ) {
1545                 /* log, close and send error */
1546                 Debug( LDAP_DEBUG_ANY, "ber_peek_tag returns 0x%lx\n", tag, 0, 0 );
1547                 ber_free( ber, 1 );
1548
1549                 return -1;
1550         }
1551
1552 #ifdef LDAP_CONNECTIONLESS
1553         if( conn->c_is_udp ) {
1554                 if( tag == LBER_OCTETSTRING ) {
1555                         ber_get_stringa( ber, &cdn );
1556                         tag = ber_peek_tag(ber, &len);
1557                 }
1558                 if( tag != LDAP_REQ_ABANDON && tag != LDAP_REQ_SEARCH ) {
1559                         Debug( LDAP_DEBUG_ANY, "invalid req for UDP 0x%lx\n", tag, 0, 0 );
1560                         ber_free( ber, 1 );
1561                         return 0;
1562                 }
1563         }
1564 #endif
1565
1566         if(tag == LDAP_REQ_BIND) {
1567                 /* immediately abandon all existing operations upon BIND */
1568                 connection_abandon( conn );
1569         }
1570
1571         op = slap_op_alloc( ber, msgid, tag, conn->c_n_ops_received++ );
1572
1573         op->o_conn = conn;
1574         /* clear state if the connection is being reused from inactive */
1575         if ( conn->c_conn_state == SLAP_C_INACTIVE ) {
1576                 memset( &conn->c_pagedresults_state, 0,
1577                         sizeof( conn->c_pagedresults_state ) );
1578         }
1579
1580         op->o_res_ber = NULL;
1581
1582 #ifdef LDAP_CONNECTIONLESS
1583         if (conn->c_is_udp) {
1584                 if ( cdn ) {
1585                         ber_str2bv( cdn, 0, 1, &op->o_dn );
1586                         op->o_protocol = LDAP_VERSION2;
1587                 }
1588                 op->o_res_ber = ber_alloc_t( LBER_USE_DER );
1589                 if (op->o_res_ber == NULL) return 1;
1590
1591                 rc = ber_write( op->o_res_ber, (char *)&peeraddr,
1592                         sizeof(struct sockaddr), 0 );
1593
1594                 if (rc != sizeof(struct sockaddr)) {
1595                         Debug( LDAP_DEBUG_ANY, "ber_write failed\n", 0, 0, 0 );
1596                         return 1;
1597                 }
1598
1599                 if (op->o_protocol == LDAP_VERSION2) {
1600                         rc = ber_printf(op->o_res_ber, "{is{" /*}}*/, op->o_msgid, "");
1601                         if (rc == -1) {
1602                                 Debug( LDAP_DEBUG_ANY, "ber_write failed\n", 0, 0, 0 );
1603                                 return rc;
1604                         }
1605                 }
1606         }
1607 #endif /* LDAP_CONNECTIONLESS */
1608
1609         rc = 0;
1610
1611         /* Don't process requests when the conn is in the middle of a
1612          * Bind, or if it's closing. Also, don't let any single conn
1613          * use up all the available threads, and don't execute if we're
1614          * currently blocked on output. And don't execute if there are
1615          * already pending ops, let them go first.  Abandon operations
1616          * get exceptions to some, but not all, cases.
1617          */
1618         switch( tag ){
1619         default:
1620                 /* Abandon and Unbind are exempt from these checks */
1621                 if (conn->c_conn_state == SLAP_C_CLOSING) {
1622                         defer = "closing";
1623                         break;
1624                 } else if (conn->c_writewaiter) {
1625                         defer = "awaiting write";
1626                         break;
1627                 } else if (conn->c_n_ops_pending) {
1628                         defer = "pending operations";
1629                         break;
1630                 }
1631                 /* FALLTHRU */
1632         case LDAP_REQ_ABANDON:
1633                 /* Unbind is exempt from these checks */
1634                 if (conn->c_n_ops_executing >= connection_pool_max/2) {
1635                         defer = "too many executing";
1636                         break;
1637                 } else if (conn->c_conn_state == SLAP_C_BINDING) {
1638                         defer = "binding";
1639                         break;
1640                 }
1641                 /* FALLTHRU */
1642         case LDAP_REQ_UNBIND:
1643                 break;
1644         }
1645
1646         if( defer ) {
1647                 int max = conn->c_dn.bv_len
1648                         ? slap_conn_max_pending_auth
1649                         : slap_conn_max_pending;
1650
1651                 Debug( LDAP_DEBUG_ANY,
1652                         "connection_input: conn=%lu deferring operation: %s\n",
1653                         conn->c_connid, defer, 0 );
1654                 conn->c_n_ops_pending++;
1655                 LDAP_STAILQ_INSERT_TAIL( &conn->c_pending_ops, op, o_next );
1656                 rc = ( conn->c_n_ops_pending > max ) ? -1 : 0;
1657
1658         } else {
1659                 conn->c_n_ops_executing++;
1660
1661 #ifdef SLAP_LIGHTWEIGHT_DISPATCHER
1662                 /*
1663                  * The first op will be processed in the same thread context,
1664                  * as long as there is only one op total.
1665                  * Subsequent ops will be submitted to the pool by
1666                  * calling connection_op_activate()
1667                  */
1668                 if ( cri->op == NULL ) {
1669                         /* the first incoming request */
1670                         connection_op_queue( op );
1671                         cri->op = op;
1672                 } else {
1673                         if ( !cri->nullop ) {
1674                                 cri->nullop = 1;
1675                                 rc = ldap_pvt_thread_pool_submit( &connection_pool,
1676                                         connection_operation, (void *) cri->op );
1677                         }
1678                         connection_op_activate( op );
1679                 }
1680 #else
1681                 connection_op_activate( op );
1682 #endif
1683         }
1684
1685 #ifdef NO_THREADS
1686         if ( conn->c_struct_state != SLAP_C_USED ) {
1687                 /* connection must have got closed underneath us */
1688                 return 1;
1689         }
1690 #endif
1691
1692         assert( conn->c_struct_state == SLAP_C_USED );
1693         return rc;
1694 }
1695
1696 static int
1697 connection_resched( Connection *conn )
1698 {
1699         Operation *op;
1700
1701         if( conn->c_conn_state == SLAP_C_CLOSING ) {
1702                 ber_socket_t    sd;
1703                 ber_sockbuf_ctrl( conn->c_sb, LBER_SB_OPT_GET_FD, &sd );
1704
1705                 Debug( LDAP_DEBUG_TRACE, "connection_resched: "
1706                         "attempting closing conn=%lu sd=%d\n",
1707                         conn->c_connid, sd, 0 );
1708                 connection_close( conn );
1709                 return 0;
1710         }
1711
1712         if( conn->c_conn_state != SLAP_C_ACTIVE || conn->c_writewaiter ) {
1713                 /* other states need different handling */
1714                 return 0;
1715         }
1716
1717         while ((op = LDAP_STAILQ_FIRST( &conn->c_pending_ops )) != NULL) {
1718                 if ( conn->c_n_ops_executing > connection_pool_max/2 ) break;
1719
1720                 LDAP_STAILQ_REMOVE_HEAD( &conn->c_pending_ops, o_next );
1721                 LDAP_STAILQ_NEXT(op, o_next) = NULL;
1722
1723                 /* pending operations should not be marked for abandonment */
1724                 assert(!op->o_abandon);
1725
1726                 conn->c_n_ops_pending--;
1727                 conn->c_n_ops_executing++;
1728
1729                 connection_op_activate( op );
1730
1731                 if ( conn->c_conn_state == SLAP_C_BINDING ) break;
1732         }
1733         return 0;
1734 }
1735
1736 static void
1737 connection_init_log_prefix( Operation *op )
1738 {
1739         if ( op->o_connid == (unsigned long)(-1) ) {
1740                 snprintf( op->o_log_prefix, sizeof( op->o_log_prefix ),
1741                         "conn=-1 op=%lu", op->o_opid );
1742
1743         } else {
1744                 snprintf( op->o_log_prefix, sizeof( op->o_log_prefix ),
1745                         "conn=%lu op=%lu", op->o_connid, op->o_opid );
1746         }
1747 }
1748
1749 static int connection_bind_cleanup_cb( Operation *op, SlapReply *rs )
1750 {
1751         op->o_conn->c_sasl_bindop = NULL;
1752
1753         ch_free( op->o_callback );
1754         op->o_callback = NULL;
1755
1756         return SLAP_CB_CONTINUE;
1757 }
1758
1759 static int connection_bind_cb( Operation *op, SlapReply *rs )
1760 {
1761         ldap_pvt_thread_mutex_lock( &op->o_conn->c_mutex );
1762         if ( op->o_conn->c_conn_state == SLAP_C_BINDING )
1763                 op->o_conn->c_conn_state = SLAP_C_ACTIVE;
1764         op->o_conn->c_sasl_bind_in_progress =
1765                 ( rs->sr_err == LDAP_SASL_BIND_IN_PROGRESS );
1766
1767         /* Moved here from bind.c due to ITS#4158 */
1768         op->o_conn->c_sasl_bindop = NULL;
1769         if ( op->orb_method == LDAP_AUTH_SASL ) {
1770                 if( rs->sr_err == LDAP_SUCCESS ) {
1771                         ber_dupbv(&op->o_conn->c_dn, &op->orb_edn);
1772                         if( !BER_BVISEMPTY( &op->orb_edn ) ) {
1773                                 /* edn is always normalized already */
1774                                 ber_dupbv( &op->o_conn->c_ndn, &op->o_conn->c_dn );
1775                         }
1776                         op->o_tmpfree( op->orb_edn.bv_val, op->o_tmpmemctx );
1777                         BER_BVZERO( &op->orb_edn );
1778                         op->o_conn->c_authmech = op->o_conn->c_sasl_bind_mech;
1779                         BER_BVZERO( &op->o_conn->c_sasl_bind_mech );
1780
1781                         op->o_conn->c_sasl_ssf = op->orb_ssf;
1782                         if( op->orb_ssf > op->o_conn->c_ssf ) {
1783                                 op->o_conn->c_ssf = op->orb_ssf;
1784                         }
1785
1786                         if( !BER_BVISEMPTY( &op->o_conn->c_dn ) ) {
1787                                 ber_len_t max = sockbuf_max_incoming_auth;
1788                                 ber_sockbuf_ctrl( op->o_conn->c_sb,
1789                                         LBER_SB_OPT_SET_MAX_INCOMING, &max );
1790                         }
1791
1792                         /* log authorization identity */
1793                         Statslog( LDAP_DEBUG_STATS,
1794                                 "%s BIND dn=\"%s\" mech=%s ssf=%d\n",
1795                                 op->o_log_prefix,
1796                                 BER_BVISNULL( &op->o_conn->c_dn ) ? "<empty>" : op->o_conn->c_dn.bv_val,
1797                                 op->o_conn->c_authmech.bv_val, op->orb_ssf, 0 );
1798
1799                         Debug( LDAP_DEBUG_TRACE,
1800                                 "do_bind: SASL/%s bind: dn=\"%s\" ssf=%d\n",
1801                                 op->o_conn->c_authmech.bv_val,
1802                                 BER_BVISNULL( &op->o_conn->c_dn ) ? "<empty>" : op->o_conn->c_dn.bv_val,
1803                                 op->orb_ssf );
1804
1805                 } else if ( rs->sr_err != LDAP_SASL_BIND_IN_PROGRESS ) {
1806                         if ( !BER_BVISNULL( &op->o_conn->c_sasl_bind_mech ) ) {
1807                                 free( op->o_conn->c_sasl_bind_mech.bv_val );
1808                                 BER_BVZERO( &op->o_conn->c_sasl_bind_mech );
1809                         }
1810                 }
1811         }
1812         ldap_pvt_thread_mutex_unlock( &op->o_conn->c_mutex );
1813
1814         ch_free( op->o_callback );
1815         op->o_callback = NULL;
1816
1817         return SLAP_CB_CONTINUE;
1818 }
1819
1820 static void connection_op_queue( Operation *op )
1821 {
1822         ber_tag_t tag = op->o_tag;
1823
1824         if (tag == LDAP_REQ_BIND) {
1825                 slap_callback *sc = ch_calloc( 1, sizeof( slap_callback ));
1826                 sc->sc_response = connection_bind_cb;
1827                 sc->sc_cleanup = connection_bind_cleanup_cb;
1828                 sc->sc_next = op->o_callback;
1829                 op->o_callback = sc;
1830                 op->o_conn->c_conn_state = SLAP_C_BINDING;
1831         }
1832
1833         if (!op->o_dn.bv_len) {
1834                 op->o_authz = op->o_conn->c_authz;
1835                 if ( BER_BVISNULL( &op->o_conn->c_sasl_authz_dn )) {
1836                         ber_dupbv( &op->o_dn, &op->o_conn->c_dn );
1837                         ber_dupbv( &op->o_ndn, &op->o_conn->c_ndn );
1838                 } else {
1839                         ber_dupbv( &op->o_dn, &op->o_conn->c_sasl_authz_dn );
1840                         ber_dupbv( &op->o_ndn, &op->o_conn->c_sasl_authz_dn );
1841                 }
1842         }
1843
1844         op->o_authtype = op->o_conn->c_authtype;
1845         ber_dupbv( &op->o_authmech, &op->o_conn->c_authmech );
1846
1847         if (!op->o_protocol) {
1848                 op->o_protocol = op->o_conn->c_protocol
1849                         ? op->o_conn->c_protocol : LDAP_VERSION3;
1850         }
1851
1852         if (op->o_conn->c_conn_state == SLAP_C_INACTIVE &&
1853                 op->o_protocol > LDAP_VERSION2)
1854         {
1855                 op->o_conn->c_conn_state = SLAP_C_ACTIVE;
1856         }
1857
1858         op->o_connid = op->o_conn->c_connid;
1859         connection_init_log_prefix( op );
1860
1861         LDAP_STAILQ_INSERT_TAIL( &op->o_conn->c_ops, op, o_next );
1862 }
1863
1864 static int connection_op_activate( Operation *op )
1865 {
1866         int rc;
1867
1868         connection_op_queue( op );
1869
1870         rc = ldap_pvt_thread_pool_submit( &connection_pool,
1871                 connection_operation, (void *) op );
1872
1873         if ( rc != 0 ) {
1874                 Debug( LDAP_DEBUG_ANY,
1875                         "connection_op_activate: submit failed (%d) for conn=%lu\n",
1876                         rc, op->o_connid, 0 );
1877                 /* should move op to pending list */
1878         }
1879
1880         return rc;
1881 }
1882
1883 int connection_write(ber_socket_t s)
1884 {
1885         Connection *c;
1886         Operation *op;
1887
1888         assert( connections != NULL );
1889
1890         slapd_clr_write( s, 0 );
1891
1892         c = connection_get( s );
1893         if( c == NULL ) {
1894                 Debug( LDAP_DEBUG_ANY,
1895                         "connection_write(%ld): no connection!\n",
1896                         (long)s, 0, 0 );
1897                 return -1;
1898         }
1899
1900         c->c_n_write++;
1901
1902         Debug( LDAP_DEBUG_TRACE,
1903                 "connection_write(%d): waking output for id=%lu\n",
1904                 s, c->c_connid, 0 );
1905         ldap_pvt_thread_cond_signal( &c->c_write_cv );
1906
1907         if ( ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_NEEDS_READ, NULL ) ) {
1908                 slapd_set_read( s, 1 );
1909         }
1910         if ( ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_NEEDS_WRITE, NULL ) ) {
1911                 slapd_set_write( s, 1 );
1912         }
1913
1914         /* If there are ops pending because of a writewaiter,
1915          * start one up.
1916          */
1917         while ((op = LDAP_STAILQ_FIRST( &c->c_pending_ops )) != NULL) {
1918                 if ( !c->c_writewaiter ) break;
1919                 if ( c->c_n_ops_executing > connection_pool_max/2 ) break;
1920
1921                 LDAP_STAILQ_REMOVE_HEAD( &c->c_pending_ops, o_next );
1922                 LDAP_STAILQ_NEXT(op, o_next) = NULL;
1923
1924                 /* pending operations should not be marked for abandonment */
1925                 assert(!op->o_abandon);
1926
1927                 c->c_n_ops_pending--;
1928                 c->c_n_ops_executing++;
1929
1930                 connection_op_activate( op );
1931
1932                 break;
1933         }
1934
1935         connection_return( c );
1936         return 0;
1937 }
1938
1939 void
1940 connection_fake_init(
1941         Connection *conn,
1942         Operation *op,
1943         void *ctx )
1944 {
1945         conn->c_connid = -1;
1946         conn->c_send_ldap_result = slap_send_ldap_result;
1947         conn->c_send_search_entry = slap_send_search_entry;
1948         conn->c_send_search_reference = slap_send_search_reference;
1949         conn->c_listener = (Listener *)&dummy_list;
1950         conn->c_peer_domain = slap_empty_bv;
1951         conn->c_peer_name = slap_empty_bv;
1952
1953         memset(op, 0, OPERATION_BUFFER_SIZE);
1954         op->o_hdr = (Opheader *)(op+1);
1955         op->o_controls = (void **)(op->o_hdr+1);
1956         /* set memory context */
1957         op->o_tmpmemctx = slap_sl_mem_create(SLAP_SLAB_SIZE, SLAP_SLAB_STACK, ctx);
1958         op->o_tmpmfuncs = &slap_sl_mfuncs;
1959         op->o_threadctx = ctx;
1960         op->o_tid = ldap_pvt_thread_pool_tid( ctx );
1961
1962         op->o_conn = conn;
1963         op->o_connid = op->o_conn->c_connid;
1964         connection_init_log_prefix( op );
1965
1966 #ifdef LDAP_SLAPI
1967         slapi_int_create_object_extensions( SLAPI_X_EXT_CONNECTION, conn );
1968         slapi_int_create_object_extensions( SLAPI_X_EXT_OPERATION, op );
1969 #endif /* LDAP_SLAPI */
1970
1971         slap_op_time( &op->o_time, &op->o_tincr );
1972 }
1973
1974 void
1975 connection_assign_nextid( Connection *conn )
1976 {
1977         ldap_pvt_thread_mutex_lock( &conn_nextid_mutex );
1978         conn->c_connid = conn_nextid++;
1979         ldap_pvt_thread_mutex_unlock( &conn_nextid_mutex );
1980 }