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 #ifdef LDAP_DEBUG
 873         if ( slap_debug & LDAP_DEBUG_TRACE ) {
 874                 ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_GET_FD, &sd );
 875         }
 876 #endif /* LDAP_DEBUG */
 877
 878         if ( !LDAP_STAILQ_EMPTY(&c->c_ops) ||
 879                 !LDAP_STAILQ_EMPTY(&c->c_pending_ops) )
 880         {
 881                 Debug( LDAP_DEBUG_TRACE,
 882                         "connection_close: deferring conn=%lu sd=%d\n",
 883                         c->c_connid, sd, 0 );
 884                 return;
 885         }
 886
 887         Debug( LDAP_DEBUG_TRACE, "connection_close: conn=%lu sd=%d\n",
 888                 c->c_connid, sd, 0 );
 889
 890         connection_destroy( c );
 891 }
 892
 893 unsigned long connections_nextid(void)
 894 {
 895         unsigned long id;
 896         assert( connections != NULL );
 897
 898         ldap_pvt_thread_mutex_lock( &conn_nextid_mutex );
 899
 900         id = conn_nextid;
 901
 902         ldap_pvt_thread_mutex_unlock( &conn_nextid_mutex );
 903
 904         return id;
 905 }
 906
 907 Connection* connection_first( ber_socket_t *index )
 908 {
 909         assert( connections != NULL );
 910         assert( index != NULL );
 911
 912         ldap_pvt_thread_mutex_lock( &connections_mutex );
 913         for( *index = 0; *index < dtblsize; (*index)++) {
 914                 if( connections[*index].c_struct_state != SLAP_C_UNINITIALIZED ) {
 915                         break;
 916                 }
 917         }
 918         ldap_pvt_thread_mutex_unlock( &connections_mutex );
 919
 920         return connection_next(NULL, index);
 921 }
 922
 923 Connection* connection_next( Connection *c, ber_socket_t *index )
 924 {
 925         assert( connections != NULL );
 926         assert( index != NULL );
 927         assert( *index <= dtblsize );
 928
 929         if( c != NULL ) ldap_pvt_thread_mutex_unlock( &c->c_mutex );
 930
 931         c = NULL;
 932
 933         ldap_pvt_thread_mutex_lock( &connections_mutex );
 934         for(; *index < dtblsize; (*index)++) {
 935                 int c_struct;
 936                 if( connections[*index].c_struct_state == SLAP_C_UNINITIALIZED ) {
 937                         assert( connections[*index].c_conn_state == SLAP_C_INVALID );
 938 #ifdef HAVE_WINSOCK
 939                         break;
 940 #else
 941                         continue;
 942 #endif
 943                 }
 944
 945                 if( connections[*index].c_struct_state == SLAP_C_USED ) {
 946                         assert( connections[*index].c_conn_state != SLAP_C_INVALID );
 947                         c = &connections[(*index)++];
 948                         if ( ldap_pvt_thread_mutex_trylock( &c->c_mutex )) {
 949                                 /* avoid deadlock */
 950                                 ldap_pvt_thread_mutex_unlock( &connections_mutex );
 951                                 ldap_pvt_thread_mutex_lock( &c->c_mutex );
 952                                 ldap_pvt_thread_mutex_lock( &connections_mutex );
 953                                 if ( c->c_struct_state != SLAP_C_USED ) {
 954                                         ldap_pvt_thread_mutex_unlock( &c->c_mutex );
 955                                         c = NULL;
 956                                         continue;
 957                                 }
 958                         }
 959                         break;
 960                 }
 961
 962                 c_struct = connections[*index].c_struct_state;
 963                 if ( c_struct == SLAP_C_PENDING )
 964                         continue;
 965                 assert( c_struct == SLAP_C_UNUSED );
 966                 assert( connections[*index].c_conn_state == SLAP_C_INVALID );
 967         }
 968
 969         ldap_pvt_thread_mutex_unlock( &connections_mutex );
 970         return c;
 971 }
 972
 973 void connection_done( Connection *c )
 974 {
 975         assert( connections != NULL );
 976
 977         if( c != NULL ) ldap_pvt_thread_mutex_unlock( &c->c_mutex );
 978 }
 979
 980 /*
 981  * connection_activity - handle the request operation op on connection
 982  * conn.  This routine figures out what kind of operation it is and
 983  * calls the appropriate stub to handle it.
 984  */
 985
 986 #ifdef SLAPD_MONITOR
 987 /* FIXME: returns 0 in case of failure */
 988 #define INCR_OP_INITIATED(index) \
 989         do { \
 990                 ldap_pvt_thread_mutex_lock( &slap_counters.sc_ops_mutex ); \
 991                 ldap_pvt_mp_add_ulong(slap_counters.sc_ops_initiated_[(index)], 1); \
 992                 ldap_pvt_thread_mutex_unlock( &slap_counters.sc_ops_mutex ); \
 993         } while (0)
 994 #define INCR_OP_COMPLETED(index) \
 995         do { \
 996                 ldap_pvt_thread_mutex_lock( &slap_counters.sc_ops_mutex ); \
 997                 ldap_pvt_mp_add_ulong(slap_counters.sc_ops_completed, 1); \
 998                 ldap_pvt_mp_add_ulong(slap_counters.sc_ops_completed_[(index)], 1); \
 999                 ldap_pvt_thread_mutex_unlock( &slap_counters.sc_ops_mutex ); \
1000         } while (0)
1001 #else /* !SLAPD_MONITOR */
1002 #define INCR_OP_INITIATED(index) do { } while (0)
1003 #define INCR_OP_COMPLETED(index) \
1004         do { \
1005                 ldap_pvt_thread_mutex_lock( &slap_counters.sc_ops_mutex ); \
1006                 ldap_pvt_mp_add_ulong(slap_counters.sc_ops_completed, 1); \
1007                 ldap_pvt_thread_mutex_unlock( &slap_counters.sc_ops_mutex ); \
1008         } while (0)
1009 #endif /* !SLAPD_MONITOR */
1010
1011 /*
1012  * NOTE: keep in sync with enum in slapd.h
1013  */
1014 static BI_op_func *opfun[] = {
1015         do_bind,
1016         do_unbind,
1017         do_add,
1018         do_delete,
1019         do_modrdn,
1020         do_modify,
1021         do_compare,
1022         do_search,
1023         do_abandon,
1024         do_extended,
1025         NULL
1026 };
1027
1028 static void *
1029 connection_operation( void *ctx, void *arg_v )
1030 {
1031         int rc = LDAP_OTHER;
1032         Operation *op = arg_v;
1033         SlapReply rs = {REP_RESULT};
1034         ber_tag_t tag = op->o_tag;
1035         slap_op_t opidx = SLAP_OP_LAST;
1036         Connection *conn = op->o_conn;
1037         void *memctx = NULL;
1038         void *memctx_null = NULL;
1039         ber_len_t memsiz;
1040
1041         ldap_pvt_thread_mutex_lock( &slap_counters.sc_ops_mutex );
1042         /* FIXME: returns 0 in case of failure */
1043         ldap_pvt_mp_add_ulong(slap_counters.sc_ops_initiated, 1);
1044         ldap_pvt_thread_mutex_unlock( &slap_counters.sc_ops_mutex );
1045
1046         op->o_threadctx = ctx;
1047 #ifdef LDAP_DEVEL
1048         op->o_tid = ldap_pvt_thread_pool_tid( ctx );
1049 #endif /* LDAP_DEVEL */
1050
1051         switch ( tag ) {
1052         case LDAP_REQ_BIND:
1053         case LDAP_REQ_UNBIND:
1054         case LDAP_REQ_ADD:
1055         case LDAP_REQ_DELETE:
1056         case LDAP_REQ_MODDN:
1057         case LDAP_REQ_MODIFY:
1058         case LDAP_REQ_COMPARE:
1059         case LDAP_REQ_SEARCH:
1060         case LDAP_REQ_ABANDON:
1061         case LDAP_REQ_EXTENDED:
1062                 break;
1063         default:
1064                 Debug( LDAP_DEBUG_ANY, "connection_operation: "
1065                         "conn %lu unknown LDAP request 0x%lx\n",
1066                         conn->c_connid, tag, 0 );
1067                 op->o_tag = LBER_ERROR;
1068                 rs.sr_err = LDAP_PROTOCOL_ERROR;
1069                 rs.sr_text = "unknown LDAP request";
1070                 send_ldap_disconnect( op, &rs );
1071                 rc = SLAPD_DISCONNECT;
1072                 goto operations_error;
1073         }
1074
1075         if( conn->c_sasl_bind_in_progress && tag != LDAP_REQ_BIND ) {
1076                 Debug( LDAP_DEBUG_ANY, "connection_operation: "
1077                         "error: SASL bind in progress (tag=%ld).\n",
1078                         (long) tag, 0, 0 );
1079                 send_ldap_error( op, &rs, LDAP_OPERATIONS_ERROR,
1080                         "SASL bind in progress" );
1081                 rc = LDAP_OPERATIONS_ERROR;
1082                 goto operations_error;
1083         }
1084
1085 #ifdef LDAP_X_TXN
1086         if (( conn->c_txn == CONN_TXN_SPECIFY ) && (
1087                 ( tag == LDAP_REQ_ADD ) ||
1088                 ( tag == LDAP_REQ_DELETE ) ||
1089                 ( tag == LDAP_REQ_MODIFY ) ||
1090                 ( tag == LDAP_REQ_MODRDN )))
1091         {
1092                 /* Disable SLAB allocator for all update operations
1093                         issued inside of a transaction */
1094                 op->o_tmpmemctx = NULL;
1095                 op->o_tmpmfuncs = &ch_mfuncs;
1096         } else
1097 #endif
1098         {
1099         /* We can use Thread-Local storage for most mallocs. We can
1100          * also use TL for ber parsing, but not on Add or Modify.
1101          */
1102 #if 0
1103         memsiz = ber_len( op->o_ber ) * 64;
1104         if ( SLAP_SLAB_SIZE > memsiz ) memsiz = SLAP_SLAB_SIZE;
1105 #endif
1106         memsiz = SLAP_SLAB_SIZE;
1107
1108         memctx = slap_sl_mem_create( memsiz, SLAP_SLAB_STACK, ctx );
1109         op->o_tmpmemctx = memctx;
1110         op->o_tmpmfuncs = &slap_sl_mfuncs;
1111         if ( tag != LDAP_REQ_ADD && tag != LDAP_REQ_MODIFY ) {
1112                 /* Note - the ber and its buffer are already allocated from
1113                  * regular memory; this only affects subsequent mallocs that
1114                  * ber_scanf may invoke.
1115                  */
1116                 ber_set_option( op->o_ber, LBER_OPT_BER_MEMCTX, &memctx );
1117         }
1118         }
1119
1120         opidx = slap_req2op( tag );
1121         assert( opidx != SLAP_OP_LAST );
1122         INCR_OP_INITIATED( opidx );
1123         rc = (*(opfun[opidx]))( op, &rs );
1124
1125 operations_error:
1126         if ( rc == SLAPD_DISCONNECT ) {
1127                 tag = LBER_ERROR;
1128
1129         } else if ( opidx != SLAP_OP_LAST ) {
1130                 /* increment completed operations count
1131                  * only if operation was initiated
1132                  * and rc != SLAPD_DISCONNECT */
1133                 INCR_OP_COMPLETED( opidx );
1134         }
1135
1136         if ( op->o_cancel == SLAP_CANCEL_REQ ) {
1137                 if ( rc == SLAPD_ABANDON ) {
1138                         op->o_cancel = SLAP_CANCEL_ACK;
1139                 } else {
1140                         op->o_cancel = LDAP_TOO_LATE;
1141                 }
1142         }
1143
1144         while ( op->o_cancel != SLAP_CANCEL_NONE &&
1145                 op->o_cancel != SLAP_CANCEL_DONE )
1146         {
1147                 ldap_pvt_thread_yield();
1148         }
1149
1150         ldap_pvt_thread_mutex_lock( &conn->c_mutex );
1151
1152         ber_set_option( op->o_ber, LBER_OPT_BER_MEMCTX, &memctx_null );
1153
1154         LDAP_STAILQ_REMOVE( &conn->c_ops, op, slap_op, o_next);
1155         LDAP_STAILQ_NEXT(op, o_next) = NULL;
1156         slap_op_free( op );
1157         conn->c_n_ops_executing--;
1158         conn->c_n_ops_completed++;
1159
1160         switch( tag ) {
1161         case LBER_ERROR:
1162         case LDAP_REQ_UNBIND:
1163                 /* c_mutex is locked */
1164                 connection_closing( conn,
1165                         tag == LDAP_REQ_UNBIND ? NULL : "operations error" );
1166                 break;
1167         }
1168
1169         connection_resched( conn );
1170         ldap_pvt_thread_mutex_unlock( &conn->c_mutex );
1171         return NULL;
1172 }
1173
1174 static const Listener dummy_list = { BER_BVC(""), BER_BVC("") };
1175
1176 int connection_client_setup(
1177         ber_socket_t s,
1178         ldap_pvt_thread_start_t *func,
1179         void *arg )
1180 {
1181         int rc;
1182         Connection *c;
1183
1184         rc = connection_init( s, (Listener *)&dummy_list, "", "",
1185                 CONN_IS_CLIENT, 0, NULL );
1186         if ( rc < 0 ) return -1;
1187
1188         c = connection_get( s );
1189         c->c_clientfunc = func;
1190         c->c_clientarg = arg;
1191
1192         slapd_add_internal( s, 0 );
1193         slapd_set_read( s, 1 );
1194         connection_return( c );
1195         return 0;
1196 }
1197
1198 void connection_client_enable(
1199         ber_socket_t s )
1200 {
1201         slapd_set_read( s, 1 );
1202 }
1203
1204 void connection_client_stop(
1205         ber_socket_t s )
1206 {
1207         Connection *c;
1208         Sockbuf *sb;
1209
1210         /* get (locked) connection */
1211         c = connection_get( s );
1212
1213         assert( c->c_conn_state == SLAP_C_CLIENT );
1214
1215         c->c_listener = NULL;
1216         c->c_conn_state = SLAP_C_INVALID;
1217         c->c_struct_state = SLAP_C_UNUSED;
1218         c->c_close_reason = "?";                        /* should never be needed */
1219         sb = c->c_sb;
1220         c->c_sb = ber_sockbuf_alloc( );
1221         {
1222                 ber_len_t max = sockbuf_max_incoming;
1223                 ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_SET_MAX_INCOMING, &max );
1224         }
1225         slapd_remove( s, sb, 0, 1, 0 );
1226
1227         connection_return( c );
1228 }
1229
1230 #ifdef SLAP_LIGHTWEIGHT_DISPATCHER
1231
1232 static int connection_read( ber_socket_t s, conn_readinfo *cri );
1233
1234 static void* connection_read_thread( void* ctx, void* argv )
1235 {
1236         int rc ;
1237         conn_readinfo cri = { NULL, NULL, NULL, 0 };
1238         ber_socket_t s = (long)argv;
1239
1240         /*
1241          * read incoming LDAP requests. If there is more than one,
1242          * the first one is returned with new_op
1243          */
1244         if( ( rc = connection_read( s, &cri ) ) < 0 ) {
1245                 Debug( LDAP_DEBUG_CONNS, "connection_read(%d) error\n", s, 0, 0 );
1246                 return (void*)(long)rc;
1247         }
1248
1249         /* execute a single queued request in the same thread */
1250         if( cri.op && !cri.nullop ) {
1251                 rc = (long)connection_operation( ctx, cri.op );
1252         } else if ( cri.func ) {
1253                 rc = (long)cri.func( ctx, cri.arg );
1254         }
1255
1256         return (void*)(long)rc;
1257 }
1258
1259 int connection_read_activate( ber_socket_t s )
1260 {
1261         int rc;
1262
1263         /*
1264          * suspend reading on this file descriptor until a connection processing
1265          * thread reads data on it. Otherwise the listener thread will repeatedly
1266          * submit the same event on it to the pool.
1267          */
1268         rc = slapd_clr_read( s, 0 );
1269         if ( rc )
1270                 return rc;
1271
1272         rc = ldap_pvt_thread_pool_submit( &connection_pool,
1273                 connection_read_thread, (void *)(long)s );
1274
1275         if( rc != 0 ) {
1276                 Debug( LDAP_DEBUG_ANY,
1277                         "connection_read_activate(%d): submit failed (%d)\n",
1278                         s, rc, 0 );
1279         }
1280
1281         return rc;
1282 }
1283 #endif
1284
1285 #ifdef SLAP_LIGHTWEIGHT_DISPATCHER
1286 static int
1287 connection_read( ber_socket_t s, conn_readinfo *cri )
1288 #else
1289 int connection_read(ber_socket_t s)
1290 #endif
1291 {
1292         int rc = 0;
1293         Connection *c;
1294
1295         assert( connections != NULL );
1296
1297         /* get (locked) connection */
1298         c = connection_get( s );
1299
1300         if( c == NULL ) {
1301                 Debug( LDAP_DEBUG_ANY,
1302                         "connection_read(%ld): no connection!\n",
1303                         (long) s, 0, 0 );
1304
1305                 return -1;
1306         }
1307
1308         c->c_n_read++;
1309
1310         if( c->c_conn_state == SLAP_C_CLOSING ) {
1311                 Debug( LDAP_DEBUG_TRACE,
1312                         "connection_read(%d): closing, ignoring input for id=%lu\n",
1313                         s, c->c_connid, 0 );
1314                 connection_return( c );
1315                 return 0;
1316         }
1317
1318         if ( c->c_conn_state == SLAP_C_CLIENT ) {
1319 #ifdef SLAP_LIGHTWEIGHT_DISPATCHER
1320                 cri->func = c->c_clientfunc;
1321                 cri->arg = c->c_clientarg;
1322                 /* read should already be cleared */
1323 #else
1324                 slapd_clr_read( s, 0 );
1325                 ldap_pvt_thread_pool_submit( &connection_pool,
1326                         c->c_clientfunc, c->c_clientarg );
1327 #endif
1328                 connection_return( c );
1329                 return 0;
1330         }
1331
1332         Debug( LDAP_DEBUG_TRACE,
1333                 "connection_read(%d): checking for input on id=%lu\n",
1334                 s, c->c_connid, 0 );
1335
1336 #ifdef HAVE_TLS
1337         if ( c->c_is_tls && c->c_needs_tls_accept ) {
1338                 rc = ldap_pvt_tls_accept( c->c_sb, slap_tls_ctx );
1339                 if ( rc < 0 ) {
1340                         Debug( LDAP_DEBUG_TRACE,
1341                                 "connection_read(%d): TLS accept failure "
1342                                 "error=%d id=%lu, closing\n",
1343                                 s, rc, c->c_connid );
1344
1345                         c->c_needs_tls_accept = 0;
1346                         /* c_mutex is locked */
1347                         connection_closing( c, "TLS negotiation failure" );
1348                         connection_close( c );
1349                         connection_return( c );
1350                         return 0;
1351
1352                 } else if ( rc == 0 ) {
1353                         void *ssl;
1354                         struct berval authid = BER_BVNULL;
1355
1356                         c->c_needs_tls_accept = 0;
1357
1358                         /* we need to let SASL know */
1359                         ssl = ldap_pvt_tls_sb_ctx( c->c_sb );
1360
1361                         c->c_tls_ssf = (slap_ssf_t) ldap_pvt_tls_get_strength( ssl );
1362                         if( c->c_tls_ssf > c->c_ssf ) {
1363                                 c->c_ssf = c->c_tls_ssf;
1364                         }
1365
1366                         rc = dnX509peerNormalize( ssl, &authid );
1367                         if ( rc != LDAP_SUCCESS ) {
1368                                 Debug( LDAP_DEBUG_TRACE, "connection_read(%d): "
1369                                         "unable to get TLS client DN, error=%d id=%lu\n",
1370                                         s, rc, c->c_connid );
1371                         }
1372                         Statslog( LDAP_DEBUG_STATS,
1373                                 "conn=%lu fd=%d TLS established tls_ssf=%u ssf=%u\n",
1374                             c->c_connid, (int) s, c->c_tls_ssf, c->c_ssf, 0 );
1375                         slap_sasl_external( c, c->c_tls_ssf, &authid );
1376                         if ( authid.bv_val ) free( authid.bv_val );
1377                 }
1378
1379                 /* if success and data is ready, fall thru to data input loop */
1380                 if( !ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_DATA_READY, NULL ) )
1381                 {
1382 #ifdef SLAP_LIGHTWEIGHT_DISPATCHER
1383                         slapd_set_read( s, 1 );
1384 #endif
1385
1386                         connection_return( c );
1387                         return 0;
1388                 }
1389         }
1390 #endif
1391
1392 #ifdef HAVE_CYRUS_SASL
1393         if ( c->c_sasl_layers ) {
1394                 /* If previous layer is not removed yet, give up for now */
1395                 if ( !c->c_sasl_sockctx ) {
1396 #ifdef SLAP_LIGHTWEIGHT_DISPATCHER
1397                         slapd_set_read( s, 1 );
1398 #endif
1399
1400                         connection_return( c );
1401                         return 0;
1402                 }
1403
1404                 c->c_sasl_layers = 0;
1405
1406                 rc = ldap_pvt_sasl_install( c->c_sb, c->c_sasl_sockctx );
1407                 if( rc != LDAP_SUCCESS ) {
1408                         Debug( LDAP_DEBUG_TRACE,
1409                                 "connection_read(%d): SASL install error "
1410                                 "error=%d id=%lu, closing\n",
1411                                 s, rc, c->c_connid );
1412
1413                         /* c_mutex is locked */
1414                         connection_closing( c, "SASL layer install failure" );
1415                         connection_close( c );
1416                         connection_return( c );
1417                         return 0;
1418                 }
1419         }
1420 #endif
1421
1422 #define CONNECTION_INPUT_LOOP 1
1423 /* #define      DATA_READY_LOOP 1 */
1424
1425         do {
1426                 /* How do we do this without getting into a busy loop ? */
1427 #ifdef SLAP_LIGHTWEIGHT_DISPATCHER
1428                 rc = connection_input( c, cri );
1429 #else
1430                 rc = connection_input( c );
1431 #endif
1432         }
1433 #ifdef DATA_READY_LOOP
1434         while( !rc && ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_DATA_READY, NULL ));
1435 #elif CONNECTION_INPUT_LOOP
1436         while(!rc);
1437 #else
1438         while(0);
1439 #endif
1440
1441         if( rc < 0 ) {
1442                 Debug( LDAP_DEBUG_CONNS,
1443                         "connection_read(%d): input error=%d id=%lu, closing.\n",
1444                         s, rc, c->c_connid );
1445
1446                 /* c_mutex is locked */
1447                 connection_closing( c, conn_lost_str );
1448                 connection_close( c );
1449                 connection_return( c );
1450                 return 0;
1451         }
1452
1453 #ifdef SLAP_LIGHTWEIGHT_DISPATCHER
1454         if ( ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_NEEDS_WRITE, NULL ) ) {
1455                 slapd_set_write( s, 0 );
1456         }
1457
1458         slapd_set_read( s, 1 );
1459 #else
1460         if ( ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_NEEDS_READ, NULL ) ) {
1461                 slapd_set_read( s, 1 );
1462         }
1463
1464         if ( ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_NEEDS_WRITE, NULL ) ) {
1465                 slapd_set_write( s, 1 );
1466         }
1467 #endif
1468
1469         connection_return( c );
1470
1471         return 0;
1472 }
1473
1474 static int
1475 #ifdef SLAP_LIGHTWEIGHT_DISPATCHER
1476 connection_input( Connection *conn , conn_readinfo *cri )
1477 #else
1478 connection_input( Connection *conn )
1479 #endif
1480 {
1481         Operation *op;
1482         ber_tag_t       tag;
1483         ber_len_t       len;
1484         ber_int_t       msgid;
1485         BerElement      *ber;
1486         int             rc;
1487 #ifdef LDAP_CONNECTIONLESS
1488         Sockaddr        peeraddr;
1489         char            *cdn = NULL;
1490 #endif
1491         char *defer = NULL;
1492
1493         if ( conn->c_currentber == NULL &&
1494                 ( conn->c_currentber = ber_alloc()) == NULL )
1495         {
1496                 Debug( LDAP_DEBUG_ANY, "ber_alloc failed\n", 0, 0, 0 );
1497                 return -1;
1498         }
1499
1500         sock_errset(0);
1501
1502 #ifdef LDAP_CONNECTIONLESS
1503         if ( conn->c_is_udp ) {
1504                 char peername[sizeof("IP=255.255.255.255:65336")];
1505
1506                 len = ber_int_sb_read(conn->c_sb, &peeraddr, sizeof(struct sockaddr));
1507                 if (len != sizeof(struct sockaddr)) return 1;
1508
1509                 sprintf( peername, "IP=%s:%d",
1510                         inet_ntoa( peeraddr.sa_in_addr.sin_addr ),
1511                         (unsigned) ntohs( peeraddr.sa_in_addr.sin_port ) );
1512                 Statslog( LDAP_DEBUG_STATS,
1513                         "conn=%lu UDP request from %s (%s) accepted.\n",
1514                         conn->c_connid, peername, conn->c_sock_name.bv_val, 0, 0 );
1515         }
1516 #endif
1517
1518         tag = ber_get_next( conn->c_sb, &len, conn->c_currentber );
1519         if ( tag != LDAP_TAG_MESSAGE ) {
1520                 int err = sock_errno();
1521                 ber_socket_t    sd;
1522
1523                 ber_sockbuf_ctrl( conn->c_sb, LBER_SB_OPT_GET_FD, &sd );
1524
1525                 if ( err != EWOULDBLOCK && err != EAGAIN ) {
1526                         /* log, close and send error */
1527                 Debug( LDAP_DEBUG_TRACE,
1528                         "ber_get_next on fd %d failed errno=%d (%s)\n",
1529                         sd, err, sock_errstr(err) );
1530                         ber_free( conn->c_currentber, 1 );
1531                         conn->c_currentber = NULL;
1532
1533                         return -2;
1534                 }
1535                 return 1;
1536         }
1537
1538         ber = conn->c_currentber;
1539         conn->c_currentber = NULL;
1540
1541         if ( (tag = ber_get_int( ber, &msgid )) != LDAP_TAG_MSGID ) {
1542                 /* log, close and send error */
1543                 Debug( LDAP_DEBUG_ANY, "ber_get_int returns 0x%lx\n", tag, 0, 0 );
1544                 ber_free( ber, 1 );
1545                 return -1;
1546         }
1547
1548         if ( (tag = ber_peek_tag( ber, &len )) == LBER_ERROR ) {
1549                 /* log, close and send error */
1550                 Debug( LDAP_DEBUG_ANY, "ber_peek_tag returns 0x%lx\n", tag, 0, 0 );
1551                 ber_free( ber, 1 );
1552
1553                 return -1;
1554         }
1555
1556 #ifdef LDAP_CONNECTIONLESS
1557         if( conn->c_is_udp ) {
1558                 if( tag == LBER_OCTETSTRING ) {
1559                         ber_get_stringa( ber, &cdn );
1560                         tag = ber_peek_tag(ber, &len);
1561                 }
1562                 if( tag != LDAP_REQ_ABANDON && tag != LDAP_REQ_SEARCH ) {
1563                         Debug( LDAP_DEBUG_ANY, "invalid req for UDP 0x%lx\n", tag, 0, 0 );
1564                         ber_free( ber, 1 );
1565                         return 0;
1566                 }
1567         }
1568 #endif
1569
1570         if(tag == LDAP_REQ_BIND) {
1571                 /* immediately abandon all existing operations upon BIND */
1572                 connection_abandon( conn );
1573         }
1574
1575         op = slap_op_alloc( ber, msgid, tag, conn->c_n_ops_received++ );
1576
1577         op->o_conn = conn;
1578         /* clear state if the connection is being reused from inactive */
1579         if ( conn->c_conn_state == SLAP_C_INACTIVE ) {
1580                 memset( &conn->c_pagedresults_state, 0,
1581                         sizeof( conn->c_pagedresults_state ) );
1582         }
1583
1584         op->o_res_ber = NULL;
1585
1586 #ifdef LDAP_CONNECTIONLESS
1587         if (conn->c_is_udp) {
1588                 if ( cdn ) {
1589                         ber_str2bv( cdn, 0, 1, &op->o_dn );
1590                         op->o_protocol = LDAP_VERSION2;
1591                 }
1592                 op->o_res_ber = ber_alloc_t( LBER_USE_DER );
1593                 if (op->o_res_ber == NULL) return 1;
1594
1595                 rc = ber_write( op->o_res_ber, (char *)&peeraddr,
1596                         sizeof(struct sockaddr), 0 );
1597
1598                 if (rc != sizeof(struct sockaddr)) {
1599                         Debug( LDAP_DEBUG_ANY, "ber_write failed\n", 0, 0, 0 );
1600                         return 1;
1601                 }
1602
1603                 if (op->o_protocol == LDAP_VERSION2) {
1604                         rc = ber_printf(op->o_res_ber, "{is{" /*}}*/, op->o_msgid, "");
1605                         if (rc == -1) {
1606                                 Debug( LDAP_DEBUG_ANY, "ber_write failed\n", 0, 0, 0 );
1607                                 return rc;
1608                         }
1609                 }
1610         }
1611 #endif /* LDAP_CONNECTIONLESS */
1612
1613         rc = 0;
1614
1615         /* Don't process requests when the conn is in the middle of a
1616          * Bind, or if it's closing. Also, don't let any single conn
1617          * use up all the available threads, and don't execute if we're
1618          * currently blocked on output. And don't execute if there are
1619          * already pending ops, let them go first.  Abandon operations
1620          * get exceptions to some, but not all, cases.
1621          */
1622         switch( tag ){
1623         default:
1624                 /* Abandon and Unbind are exempt from these checks */
1625                 if (conn->c_conn_state == SLAP_C_CLOSING) {
1626                         defer = "closing";
1627                         break;
1628                 } else if (conn->c_writewaiter) {
1629                         defer = "awaiting write";
1630                         break;
1631                 } else if (conn->c_n_ops_pending) {
1632                         defer = "pending operations";
1633                         break;
1634                 }
1635                 /* FALLTHRU */
1636         case LDAP_REQ_ABANDON:
1637                 /* Unbind is exempt from these checks */
1638                 if (conn->c_n_ops_executing >= connection_pool_max/2) {
1639                         defer = "too many executing";
1640                         break;
1641                 } else if (conn->c_conn_state == SLAP_C_BINDING) {
1642                         defer = "binding";
1643                         break;
1644                 }
1645                 /* FALLTHRU */
1646         case LDAP_REQ_UNBIND:
1647                 break;
1648         }
1649
1650         if( defer ) {
1651                 int max = conn->c_dn.bv_len
1652                         ? slap_conn_max_pending_auth
1653                         : slap_conn_max_pending;
1654
1655                 Debug( LDAP_DEBUG_ANY,
1656                         "connection_input: conn=%lu deferring operation: %s\n",
1657                         conn->c_connid, defer, 0 );
1658                 conn->c_n_ops_pending++;
1659                 LDAP_STAILQ_INSERT_TAIL( &conn->c_pending_ops, op, o_next );
1660                 rc = ( conn->c_n_ops_pending > max ) ? -1 : 0;
1661
1662         } else {
1663                 conn->c_n_ops_executing++;
1664
1665 #ifdef SLAP_LIGHTWEIGHT_DISPATCHER
1666                 /*
1667                  * The first op will be processed in the same thread context,
1668                  * as long as there is only one op total.
1669                  * Subsequent ops will be submitted to the pool by
1670                  * calling connection_op_activate()
1671                  */
1672                 if ( cri->op == NULL ) {
1673                         /* the first incoming request */
1674                         connection_op_queue( op );
1675                         cri->op = op;
1676                 } else {
1677                         if ( !cri->nullop ) {
1678                                 cri->nullop = 1;
1679                                 rc = ldap_pvt_thread_pool_submit( &connection_pool,
1680                                         connection_operation, (void *) cri->op );
1681                         }
1682                         connection_op_activate( op );
1683                 }
1684 #else
1685                 connection_op_activate( op );
1686 #endif
1687         }
1688
1689 #ifdef NO_THREADS
1690         if ( conn->c_struct_state != SLAP_C_USED ) {
1691                 /* connection must have got closed underneath us */
1692                 return 1;
1693         }
1694 #endif
1695
1696         assert( conn->c_struct_state == SLAP_C_USED );
1697         return rc;
1698 }
1699
1700 static int
1701 connection_resched( Connection *conn )
1702 {
1703         Operation *op;
1704
1705         if( conn->c_conn_state == SLAP_C_CLOSING ) {
1706                 ber_socket_t    sd;
1707                 ber_sockbuf_ctrl( conn->c_sb, LBER_SB_OPT_GET_FD, &sd );
1708
1709                 Debug( LDAP_DEBUG_TRACE, "connection_resched: "
1710                         "attempting closing conn=%lu sd=%d\n",
1711                         conn->c_connid, sd, 0 );
1712                 connection_close( conn );
1713                 return 0;
1714         }
1715
1716         if( conn->c_conn_state != SLAP_C_ACTIVE || conn->c_writewaiter ) {
1717                 /* other states need different handling */
1718                 return 0;
1719         }
1720
1721         while ((op = LDAP_STAILQ_FIRST( &conn->c_pending_ops )) != NULL) {
1722                 if ( conn->c_n_ops_executing > connection_pool_max/2 ) break;
1723
1724                 LDAP_STAILQ_REMOVE_HEAD( &conn->c_pending_ops, o_next );
1725                 LDAP_STAILQ_NEXT(op, o_next) = NULL;
1726
1727                 /* pending operations should not be marked for abandonment */
1728                 assert(!op->o_abandon);
1729
1730                 conn->c_n_ops_pending--;
1731                 conn->c_n_ops_executing++;
1732
1733                 connection_op_activate( op );
1734
1735                 if ( conn->c_conn_state == SLAP_C_BINDING ) break;
1736         }
1737         return 0;
1738 }
1739
1740 static void
1741 connection_init_log_prefix( Operation *op )
1742 {
1743         if ( op->o_connid == (unsigned long)(-1) ) {
1744                 snprintf( op->o_log_prefix, sizeof( op->o_log_prefix ),
1745                         "conn=-1 op=%lu", op->o_opid );
1746
1747         } else {
1748                 snprintf( op->o_log_prefix, sizeof( op->o_log_prefix ),
1749                         "conn=%lu op=%lu", op->o_connid, op->o_opid );
1750         }
1751 }
1752
1753 static int connection_bind_cleanup_cb( Operation *op, SlapReply *rs )
1754 {
1755         op->o_conn->c_sasl_bindop = NULL;
1756
1757         ch_free( op->o_callback );
1758         op->o_callback = NULL;
1759
1760         return SLAP_CB_CONTINUE;
1761 }
1762
1763 static int connection_bind_cb( Operation *op, SlapReply *rs )
1764 {
1765         ldap_pvt_thread_mutex_lock( &op->o_conn->c_mutex );
1766         if ( op->o_conn->c_conn_state == SLAP_C_BINDING )
1767                 op->o_conn->c_conn_state = SLAP_C_ACTIVE;
1768         op->o_conn->c_sasl_bind_in_progress =
1769                 ( rs->sr_err == LDAP_SASL_BIND_IN_PROGRESS );
1770
1771         /* Moved here from bind.c due to ITS#4158 */
1772         op->o_conn->c_sasl_bindop = NULL;
1773         if ( op->orb_method == LDAP_AUTH_SASL ) {
1774                 if( rs->sr_err == LDAP_SUCCESS ) {
1775                         ber_dupbv(&op->o_conn->c_dn, &op->orb_edn);
1776                         if( !BER_BVISEMPTY( &op->orb_edn ) ) {
1777                                 /* edn is always normalized already */
1778                                 ber_dupbv( &op->o_conn->c_ndn, &op->o_conn->c_dn );
1779                         }
1780                         op->o_tmpfree( op->orb_edn.bv_val, op->o_tmpmemctx );
1781                         BER_BVZERO( &op->orb_edn );
1782                         op->o_conn->c_authmech = op->o_conn->c_sasl_bind_mech;
1783                         BER_BVZERO( &op->o_conn->c_sasl_bind_mech );
1784
1785                         op->o_conn->c_sasl_ssf = op->orb_ssf;
1786                         if( op->orb_ssf > op->o_conn->c_ssf ) {
1787                                 op->o_conn->c_ssf = op->orb_ssf;
1788                         }
1789
1790                         if( !BER_BVISEMPTY( &op->o_conn->c_dn ) ) {
1791                                 ber_len_t max = sockbuf_max_incoming_auth;
1792                                 ber_sockbuf_ctrl( op->o_conn->c_sb,
1793                                         LBER_SB_OPT_SET_MAX_INCOMING, &max );
1794                         }
1795
1796                         /* log authorization identity */
1797                         Statslog( LDAP_DEBUG_STATS,
1798                                 "%s BIND dn=\"%s\" mech=%s ssf=%d\n",
1799                                 op->o_log_prefix,
1800                                 BER_BVISNULL( &op->o_conn->c_dn ) ? "<empty>" : op->o_conn->c_dn.bv_val,
1801                                 op->o_conn->c_authmech.bv_val, op->orb_ssf, 0 );
1802
1803                         Debug( LDAP_DEBUG_TRACE,
1804                                 "do_bind: SASL/%s bind: dn=\"%s\" ssf=%d\n",
1805                                 op->o_conn->c_authmech.bv_val,
1806                                 BER_BVISNULL( &op->o_conn->c_dn ) ? "<empty>" : op->o_conn->c_dn.bv_val,
1807                                 op->orb_ssf );
1808
1809                 } else if ( rs->sr_err != LDAP_SASL_BIND_IN_PROGRESS ) {
1810                         if ( !BER_BVISNULL( &op->o_conn->c_sasl_bind_mech ) ) {
1811                                 free( op->o_conn->c_sasl_bind_mech.bv_val );
1812                                 BER_BVZERO( &op->o_conn->c_sasl_bind_mech );
1813                         }
1814                 }
1815         }
1816         ldap_pvt_thread_mutex_unlock( &op->o_conn->c_mutex );
1817
1818         ch_free( op->o_callback );
1819         op->o_callback = NULL;
1820
1821         return SLAP_CB_CONTINUE;
1822 }
1823
1824 static void connection_op_queue( Operation *op )
1825 {
1826         ber_tag_t tag = op->o_tag;
1827
1828         if (tag == LDAP_REQ_BIND) {
1829                 slap_callback *sc = ch_calloc( 1, sizeof( slap_callback ));
1830                 sc->sc_response = connection_bind_cb;
1831                 sc->sc_cleanup = connection_bind_cleanup_cb;
1832                 sc->sc_next = op->o_callback;
1833                 op->o_callback = sc;
1834                 op->o_conn->c_conn_state = SLAP_C_BINDING;
1835         }
1836
1837         if (!op->o_dn.bv_len) {
1838                 op->o_authz = op->o_conn->c_authz;
1839                 if ( BER_BVISNULL( &op->o_conn->c_sasl_authz_dn )) {
1840                         ber_dupbv( &op->o_dn, &op->o_conn->c_dn );
1841                         ber_dupbv( &op->o_ndn, &op->o_conn->c_ndn );
1842                 } else {
1843                         ber_dupbv( &op->o_dn, &op->o_conn->c_sasl_authz_dn );
1844                         ber_dupbv( &op->o_ndn, &op->o_conn->c_sasl_authz_dn );
1845                 }
1846         }
1847
1848         op->o_authtype = op->o_conn->c_authtype;
1849         ber_dupbv( &op->o_authmech, &op->o_conn->c_authmech );
1850
1851         if (!op->o_protocol) {
1852                 op->o_protocol = op->o_conn->c_protocol
1853                         ? op->o_conn->c_protocol : LDAP_VERSION3;
1854         }
1855
1856         if (op->o_conn->c_conn_state == SLAP_C_INACTIVE &&
1857                 op->o_protocol > LDAP_VERSION2)
1858         {
1859                 op->o_conn->c_conn_state = SLAP_C_ACTIVE;
1860         }
1861
1862         op->o_connid = op->o_conn->c_connid;
1863         connection_init_log_prefix( op );
1864
1865         LDAP_STAILQ_INSERT_TAIL( &op->o_conn->c_ops, op, o_next );
1866 }
1867
1868 static int connection_op_activate( Operation *op )
1869 {
1870         int rc;
1871
1872         connection_op_queue( op );
1873
1874         rc = ldap_pvt_thread_pool_submit( &connection_pool,
1875                 connection_operation, (void *) op );
1876
1877         if ( rc != 0 ) {
1878                 Debug( LDAP_DEBUG_ANY,
1879                         "connection_op_activate: submit failed (%d) for conn=%lu\n",
1880                         rc, op->o_connid, 0 );
1881                 /* should move op to pending list */
1882         }
1883
1884         return rc;
1885 }
1886
1887 int connection_write(ber_socket_t s)
1888 {
1889         Connection *c;
1890         Operation *op;
1891
1892         assert( connections != NULL );
1893
1894         slapd_clr_write( s, 0 );
1895
1896         c = connection_get( s );
1897         if( c == NULL ) {
1898                 Debug( LDAP_DEBUG_ANY,
1899                         "connection_write(%ld): no connection!\n",
1900                         (long)s, 0, 0 );
1901                 return -1;
1902         }
1903
1904         c->c_n_write++;
1905
1906         Debug( LDAP_DEBUG_TRACE,
1907                 "connection_write(%d): waking output for id=%lu\n",
1908                 s, c->c_connid, 0 );
1909         ldap_pvt_thread_cond_signal( &c->c_write_cv );
1910
1911         if ( ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_NEEDS_READ, NULL ) ) {
1912                 slapd_set_read( s, 1 );
1913         }
1914         if ( ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_NEEDS_WRITE, NULL ) ) {
1915                 slapd_set_write( s, 1 );
1916         }
1917
1918         /* If there are ops pending because of a writewaiter,
1919          * start one up.
1920          */
1921         while ((op = LDAP_STAILQ_FIRST( &c->c_pending_ops )) != NULL) {
1922                 if ( !c->c_writewaiter ) break;
1923                 if ( c->c_n_ops_executing > connection_pool_max/2 ) break;
1924
1925                 LDAP_STAILQ_REMOVE_HEAD( &c->c_pending_ops, o_next );
1926                 LDAP_STAILQ_NEXT(op, o_next) = NULL;
1927
1928                 /* pending operations should not be marked for abandonment */
1929                 assert(!op->o_abandon);
1930
1931                 c->c_n_ops_pending--;
1932                 c->c_n_ops_executing++;
1933
1934                 connection_op_activate( op );
1935
1936                 break;
1937         }
1938
1939         connection_return( c );
1940         return 0;
1941 }
1942
1943 void
1944 connection_fake_init(
1945         Connection *conn,
1946         Operation *op,
1947         void *ctx )
1948 {
1949         conn->c_connid = -1;
1950         conn->c_send_ldap_result = slap_send_ldap_result;
1951         conn->c_send_search_entry = slap_send_search_entry;
1952         conn->c_send_search_reference = slap_send_search_reference;
1953         conn->c_listener = (Listener *)&dummy_list;
1954         conn->c_peer_domain = slap_empty_bv;
1955         conn->c_peer_name = slap_empty_bv;
1956
1957         memset(op, 0, OPERATION_BUFFER_SIZE);
1958         op->o_hdr = (Opheader *)(op+1);
1959         op->o_controls = (void **)(op->o_hdr+1);
1960         /* set memory context */
1961         op->o_tmpmemctx = slap_sl_mem_create(SLAP_SLAB_SIZE, SLAP_SLAB_STACK, ctx);
1962         op->o_tmpmfuncs = &slap_sl_mfuncs;
1963         op->o_threadctx = ctx;
1964 #ifdef LDAP_DEVEL
1965         op->o_tid = ldap_pvt_thread_pool_tid( ctx );
1966 #endif /* LDAP_DEVEL */
1967
1968         op->o_conn = conn;
1969         op->o_connid = op->o_conn->c_connid;
1970         connection_init_log_prefix( op );
1971
1972 #ifdef LDAP_SLAPI
1973         slapi_int_create_object_extensions( SLAPI_X_EXT_CONNECTION, conn );
1974         slapi_int_create_object_extensions( SLAPI_X_EXT_OPERATION, op );
1975 #endif /* LDAP_SLAPI */
1976
1977         slap_op_time( &op->o_time, &op->o_tincr );
1978 }
1979
1980 void
1981 connection_assign_nextid( Connection *conn )
1982 {
1983         ldap_pvt_thread_mutex_lock( &conn_nextid_mutex );
1984         conn->c_connid = conn_nextid++;
1985         ldap_pvt_thread_mutex_unlock( &conn_nextid_mutex );
1986 }