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