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 1998-2008 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 #ifdef HAVE_WINSOCK
 314                 /* Avoid race condition after releasing
 315                  * connections_mutex
 316                  */
 317                 if ( sd != s ) {
 318                         ldap_pvt_thread_mutex_unlock( &c->c_mutex );
 319                         return NULL;
 320                 }
 321 #endif
 322                 if( c->c_struct_state != SLAP_C_USED ) {
 323                         /* connection must have been closed due to resched */
 324
 325                         assert( c->c_conn_state == SLAP_C_INVALID );
 326                         assert( sd == AC_SOCKET_INVALID );
 327
 328                         Debug( LDAP_DEBUG_TRACE,
 329                                 "connection_get(%d): connection not used\n",
 330                                 s, 0, 0 );
 331
 332                         ldap_pvt_thread_mutex_unlock( &c->c_mutex );
 333                         return NULL;
 334                 }
 335
 336                 Debug( LDAP_DEBUG_TRACE,
 337                         "connection_get(%d): got connid=%lu\n",
 338                         s, c->c_connid, 0 );
 339
 340                 c->c_n_get++;
 341
 342                 assert( c->c_struct_state == SLAP_C_USED );
 343                 assert( c->c_conn_state != SLAP_C_INVALID );
 344                 assert( sd != AC_SOCKET_INVALID );
 345
 346 #ifndef SLAPD_MONITOR
 347                 if ( global_idletimeout > 0 )
 348 #endif /* ! SLAPD_MONITOR */
 349                 {
 350                         c->c_activitytime = slap_get_time();
 351                 }
 352         }
 353
 354         return c;
 355 }
 356
 357 static void connection_return( Connection *c )
 358 {
 359         ldap_pvt_thread_mutex_unlock( &c->c_mutex );
 360 }
 361
 362 long connection_init(
 363         ber_socket_t s,
 364         Listener *listener,
 365         const char* dnsname,
 366         const char* peername,
 367         int flags,
 368         slap_ssf_t ssf,
 369         struct berval *authid )
 370 {
 371         unsigned long id;
 372         Connection *c;
 373         int doinit = 0;
 374
 375         assert( connections != NULL );
 376
 377         assert( listener != NULL );
 378         assert( dnsname != NULL );
 379         assert( peername != NULL );
 380
 381 #ifndef HAVE_TLS
 382         assert( flags != CONN_IS_TLS );
 383 #endif
 384
 385         if( s == AC_SOCKET_INVALID ) {
 386                 Debug( LDAP_DEBUG_ANY,
 387                         "connection_init: init of socket %ld invalid.\n", (long)s, 0, 0 );
 388                 return -1;
 389         }
 390
 391         assert( s >= 0 );
 392 #ifndef HAVE_WINSOCK
 393         assert( s < dtblsize );
 394         c = &connections[s];
 395         if( c->c_struct_state == SLAP_C_UNINITIALIZED ) {
 396                 doinit = 1;
 397         } else {
 398                 assert( c->c_struct_state == SLAP_C_UNUSED );
 399         }
 400 #else
 401         {
 402                 ber_socket_t i;
 403                 c = NULL;
 404
 405                 ldap_pvt_thread_mutex_lock( &connections_mutex );
 406                 for( i=0; i < dtblsize; i++) {
 407                         ber_socket_t    sd;
 408
 409                         if ( connections[i].c_struct_state == SLAP_C_PENDING )
 410                                 continue;
 411
 412                         if( connections[i].c_struct_state == SLAP_C_UNINITIALIZED ) {
 413                                 assert( connections[i].c_sb == 0 );
 414                                 c = &connections[i];
 415                                 c->c_struct_state = SLAP_C_PENDING;
 416                                 doinit = 1;
 417                                 break;
 418                         }
 419
 420                         sd = AC_SOCKET_INVALID;
 421                         if (connections[i].c_sb != NULL) {
 422                                 ber_sockbuf_ctrl( connections[i].c_sb,
 423                                         LBER_SB_OPT_GET_FD, &sd );
 424                         }
 425
 426                         if( connections[i].c_struct_state == SLAP_C_UNUSED ) {
 427                                 assert( sd == AC_SOCKET_INVALID );
 428                                 c = &connections[i];
 429                                 c->c_struct_state = SLAP_C_PENDING;
 430                                 break;
 431                         }
 432
 433                         if( connections[i].c_conn_state == SLAP_C_CLIENT ) continue;
 434
 435                         assert( connections[i].c_struct_state == SLAP_C_USED );
 436                         assert( connections[i].c_conn_state != SLAP_C_INVALID );
 437                         assert( sd != AC_SOCKET_INVALID );
 438                 }
 439                 ldap_pvt_thread_mutex_unlock( &connections_mutex );
 440
 441                 if( c == NULL ) {
 442                         Debug( LDAP_DEBUG_ANY,
 443                                 "connection_init(%d): connection table full "
 444                                 "(%d/%d)\n", s, i, dtblsize);
 445                         return -1;
 446                 }
 447         }
 448 #endif
 449
 450         if( doinit ) {
 451                 c->c_send_ldap_result = slap_send_ldap_result;
 452                 c->c_send_search_entry = slap_send_search_entry;
 453                 c->c_send_search_reference = slap_send_search_reference;
 454                 c->c_send_ldap_extended = slap_send_ldap_extended;
 455                 c->c_send_ldap_intermediate = slap_send_ldap_intermediate;
 456
 457                 BER_BVZERO( &c->c_authmech );
 458                 BER_BVZERO( &c->c_dn );
 459                 BER_BVZERO( &c->c_ndn );
 460
 461                 c->c_listener = NULL;
 462                 BER_BVZERO( &c->c_peer_domain );
 463                 BER_BVZERO( &c->c_peer_name );
 464
 465                 LDAP_STAILQ_INIT(&c->c_ops);
 466                 LDAP_STAILQ_INIT(&c->c_pending_ops);
 467
 468 #ifdef LDAP_X_TXN
 469                 c->c_txn = CONN_TXN_INACTIVE;
 470                 c->c_txn_backend = NULL;
 471                 LDAP_STAILQ_INIT(&c->c_txn_ops);
 472 #endif
 473
 474                 BER_BVZERO( &c->c_sasl_bind_mech );
 475                 c->c_sasl_done = 0;
 476                 c->c_sasl_authctx = NULL;
 477                 c->c_sasl_sockctx = NULL;
 478                 c->c_sasl_extra = NULL;
 479                 c->c_sasl_bindop = NULL;
 480
 481                 c->c_sb = ber_sockbuf_alloc( );
 482
 483                 {
 484                         ber_len_t max = sockbuf_max_incoming;
 485                         ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_SET_MAX_INCOMING, &max );
 486                 }
 487
 488                 c->c_currentber = NULL;
 489
 490                 /* should check status of thread calls */
 491                 ldap_pvt_thread_mutex_init( &c->c_mutex );
 492                 ldap_pvt_thread_mutex_init( &c->c_write_mutex );
 493                 ldap_pvt_thread_cond_init( &c->c_write_cv );
 494
 495 #ifdef LDAP_SLAPI
 496                 if ( slapi_plugins_used ) {
 497                         slapi_int_create_object_extensions( SLAPI_X_EXT_CONNECTION, c );
 498                 }
 499 #endif
 500         }
 501
 502         ldap_pvt_thread_mutex_lock( &c->c_mutex );
 503
 504         assert( BER_BVISNULL( &c->c_authmech ) );
 505         assert( BER_BVISNULL( &c->c_dn ) );
 506         assert( BER_BVISNULL( &c->c_ndn ) );
 507         assert( c->c_listener == NULL );
 508         assert( BER_BVISNULL( &c->c_peer_domain ) );
 509         assert( BER_BVISNULL( &c->c_peer_name ) );
 510         assert( LDAP_STAILQ_EMPTY(&c->c_ops) );
 511         assert( LDAP_STAILQ_EMPTY(&c->c_pending_ops) );
 512 #ifdef LDAP_X_TXN
 513         assert( c->c_txn == CONN_TXN_INACTIVE );
 514         assert( c->c_txn_backend == NULL );
 515         assert( LDAP_STAILQ_EMPTY(&c->c_txn_ops) );
 516 #endif
 517         assert( BER_BVISNULL( &c->c_sasl_bind_mech ) );
 518         assert( c->c_sasl_done == 0 );
 519         assert( c->c_sasl_authctx == NULL );
 520         assert( c->c_sasl_sockctx == NULL );
 521         assert( c->c_sasl_extra == NULL );
 522         assert( c->c_sasl_bindop == NULL );
 523         assert( c->c_currentber == NULL );
 524         assert( c->c_writewaiter == 0);
 525
 526         c->c_listener = listener;
 527
 528         if ( flags == CONN_IS_CLIENT ) {
 529                 c->c_conn_state = SLAP_C_CLIENT;
 530                 c->c_struct_state = SLAP_C_USED;
 531                 c->c_close_reason = "?";                        /* should never be needed */
 532                 ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_SET_FD, &s );
 533                 ldap_pvt_thread_mutex_unlock( &c->c_mutex );
 534
 535                 return 0;
 536         }
 537
 538         ber_str2bv( dnsname, 0, 1, &c->c_peer_domain );
 539         ber_str2bv( peername, 0, 1, &c->c_peer_name );
 540
 541         c->c_n_ops_received = 0;
 542         c->c_n_ops_executing = 0;
 543         c->c_n_ops_pending = 0;
 544         c->c_n_ops_completed = 0;
 545
 546         c->c_n_get = 0;
 547         c->c_n_read = 0;
 548         c->c_n_write = 0;
 549
 550         /* set to zero until bind, implies LDAP_VERSION3 */
 551         c->c_protocol = 0;
 552
 553 #ifndef SLAPD_MONITOR
 554         if ( global_idletimeout > 0 )
 555 #endif /* ! SLAPD_MONITOR */
 556         {
 557                 c->c_activitytime = c->c_starttime = slap_get_time();
 558         }
 559
 560 #ifdef LDAP_CONNECTIONLESS
 561         c->c_is_udp = 0;
 562         if( flags == CONN_IS_UDP ) {
 563                 c->c_is_udp = 1;
 564 #ifdef LDAP_DEBUG
 565                 ber_sockbuf_add_io( c->c_sb, &ber_sockbuf_io_debug,
 566                         LBER_SBIOD_LEVEL_PROVIDER, (void*)"udp_" );
 567 #endif
 568                 ber_sockbuf_add_io( c->c_sb, &ber_sockbuf_io_udp,
 569                         LBER_SBIOD_LEVEL_PROVIDER, (void *)&s );
 570                 ber_sockbuf_add_io( c->c_sb, &ber_sockbuf_io_readahead,
 571                         LBER_SBIOD_LEVEL_PROVIDER, NULL );
 572         } else
 573 #endif
 574         {
 575 #ifdef LDAP_DEBUG
 576                 ber_sockbuf_add_io( c->c_sb, &ber_sockbuf_io_debug,
 577                         LBER_SBIOD_LEVEL_PROVIDER, (void*)"tcp_" );
 578 #endif
 579                 ber_sockbuf_add_io( c->c_sb, &ber_sockbuf_io_tcp,
 580                         LBER_SBIOD_LEVEL_PROVIDER, (void *)&s );
 581         }
 582
 583 #ifdef LDAP_DEBUG
 584         ber_sockbuf_add_io( c->c_sb, &ber_sockbuf_io_debug,
 585                 INT_MAX, (void*)"ldap_" );
 586 #endif
 587
 588         if( ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_SET_NONBLOCK,
 589                 c /* non-NULL */ ) < 0 )
 590         {
 591                 Debug( LDAP_DEBUG_ANY,
 592                         "connection_init(%d, %s): set nonblocking failed\n",
 593                         s, c->c_peer_name.bv_val, 0 );
 594         }
 595
 596         ldap_pvt_thread_mutex_lock( &conn_nextid_mutex );
 597         id = c->c_connid = conn_nextid++;
 598         ldap_pvt_thread_mutex_unlock( &conn_nextid_mutex );
 599
 600         c->c_conn_state = SLAP_C_INACTIVE;
 601         c->c_struct_state = SLAP_C_USED;
 602         c->c_close_reason = "?";                        /* should never be needed */
 603
 604         c->c_ssf = c->c_transport_ssf = ssf;
 605         c->c_tls_ssf = 0;
 606
 607 #ifdef HAVE_TLS
 608         if ( flags == CONN_IS_TLS ) {
 609                 c->c_is_tls = 1;
 610                 c->c_needs_tls_accept = 1;
 611         } else {
 612                 c->c_is_tls = 0;
 613                 c->c_needs_tls_accept = 0;
 614         }
 615 #endif
 616
 617         slap_sasl_open( c, 0 );
 618         slap_sasl_external( c, ssf, authid );
 619
 620         slapd_add_internal( s, 1 );
 621         ldap_pvt_thread_mutex_unlock( &c->c_mutex );
 622
 623         backend_connection_init(c);
 624
 625         return id;
 626 }
 627
 628 void connection2anonymous( Connection *c )
 629 {
 630         assert( connections != NULL );
 631         assert( c != NULL );
 632
 633         {
 634                 ber_len_t max = sockbuf_max_incoming;
 635                 ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_SET_MAX_INCOMING, &max );
 636         }
 637
 638         if ( !BER_BVISNULL( &c->c_authmech ) ) {
 639                 ch_free(c->c_authmech.bv_val);
 640         }
 641         BER_BVZERO( &c->c_authmech );
 642
 643         if ( !BER_BVISNULL( &c->c_dn ) ) {
 644                 ch_free(c->c_dn.bv_val);
 645         }
 646         BER_BVZERO( &c->c_dn );
 647
 648         if ( !BER_BVISNULL( &c->c_ndn ) ) {
 649                 ch_free(c->c_ndn.bv_val);
 650         }
 651         BER_BVZERO( &c->c_ndn );
 652
 653         if ( !BER_BVISNULL( &c->c_sasl_authz_dn ) ) {
 654                 ber_memfree_x( c->c_sasl_authz_dn.bv_val, NULL );
 655         }
 656         BER_BVZERO( &c->c_sasl_authz_dn );
 657
 658         c->c_authz_backend = NULL;
 659 }
 660
 661 static void
 662 connection_destroy( Connection *c )
 663 {
 664         ber_socket_t    sd;
 665         unsigned long   connid;
 666         const char              *close_reason;
 667         Sockbuf                 *sb;
 668
 669         assert( connections != NULL );
 670         assert( c != NULL );
 671         assert( c->c_struct_state != SLAP_C_UNUSED );
 672         assert( c->c_conn_state != SLAP_C_INVALID );
 673         assert( LDAP_STAILQ_EMPTY(&c->c_ops) );
 674         assert( LDAP_STAILQ_EMPTY(&c->c_pending_ops) );
 675 #ifdef LDAP_X_TXN
 676         assert( c->c_txn == CONN_TXN_INACTIVE );
 677         assert( c->c_txn_backend == NULL );
 678         assert( LDAP_STAILQ_EMPTY(&c->c_txn_ops) );
 679 #endif
 680         assert( c->c_writewaiter == 0);
 681
 682         /* only for stats (print -1 as "%lu" may give unexpected results ;) */
 683         connid = c->c_connid;
 684         close_reason = c->c_close_reason;
 685
 686         ldap_pvt_thread_mutex_lock( &connections_mutex );
 687         c->c_struct_state = SLAP_C_PENDING;
 688         ldap_pvt_thread_mutex_unlock( &connections_mutex );
 689
 690         backend_connection_destroy(c);
 691
 692         c->c_protocol = 0;
 693         c->c_connid = -1;
 694
 695         c->c_activitytime = c->c_starttime = 0;
 696
 697         connection2anonymous( c );
 698         c->c_listener = NULL;
 699
 700         if(c->c_peer_domain.bv_val != NULL) {
 701                 free(c->c_peer_domain.bv_val);
 702         }
 703         BER_BVZERO( &c->c_peer_domain );
 704         if(c->c_peer_name.bv_val != NULL) {
 705                 free(c->c_peer_name.bv_val);
 706         }
 707         BER_BVZERO( &c->c_peer_name );
 708
 709         c->c_sasl_bind_in_progress = 0;
 710         if(c->c_sasl_bind_mech.bv_val != NULL) {
 711                 free(c->c_sasl_bind_mech.bv_val);
 712         }
 713         BER_BVZERO( &c->c_sasl_bind_mech );
 714
 715         slap_sasl_close( c );
 716
 717         if ( c->c_currentber != NULL ) {
 718                 ber_free( c->c_currentber, 1 );
 719                 c->c_currentber = NULL;
 720         }
 721
 722
 723 #ifdef LDAP_SLAPI
 724         /* call destructors, then constructors; avoids unnecessary allocation */
 725         if ( slapi_plugins_used ) {
 726                 slapi_int_clear_object_extensions( SLAPI_X_EXT_CONNECTION, c );
 727         }
 728 #endif
 729
 730         c->c_conn_state = SLAP_C_INVALID;
 731         c->c_struct_state = SLAP_C_UNUSED;
 732         c->c_close_reason = "?";                        /* should never be needed */
 733
 734         sb = c->c_sb;
 735         c->c_sb = ber_sockbuf_alloc( );
 736         {
 737                 ber_len_t max = sockbuf_max_incoming;
 738                 ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_SET_MAX_INCOMING, &max );
 739         }
 740
 741         ber_sockbuf_ctrl( sb, LBER_SB_OPT_GET_FD, &sd );
 742
 743         /* c must be fully reset by this point; when we call slapd_remove
 744          * it may get immediately reused by a new connection.
 745          */
 746         if ( sd != AC_SOCKET_INVALID ) {
 747                 slapd_remove( sd, sb, 1, 0, 0 );
 748
 749                 if ( close_reason == NULL ) {
 750                         Statslog( LDAP_DEBUG_STATS, "conn=%lu fd=%ld closed\n",
 751                                 connid, (long) sd, 0, 0, 0 );
 752                 } else {
 753                         Statslog( LDAP_DEBUG_STATS, "conn=%lu fd=%ld closed (%s)\n",
 754                                 connid, (long) sd, close_reason, 0, 0 );
 755                 }
 756         }
 757 }
 758
 759 int connection_state_closing( Connection *c )
 760 {
 761         /* c_mutex must be locked by caller */
 762
 763         int state;
 764         assert( c != NULL );
 765         assert( c->c_struct_state == SLAP_C_USED );
 766
 767         state = c->c_conn_state;
 768
 769         assert( state != SLAP_C_INVALID );
 770
 771         return state == SLAP_C_CLOSING;
 772 }
 773
 774 static void connection_abandon( Connection *c )
 775 {
 776         /* c_mutex must be locked by caller */
 777
 778         Operation *o, *next, op = {0};
 779         Opheader ohdr = {0};
 780         SlapReply rs = {0};
 781
 782         op.o_hdr = &ohdr;
 783         op.o_conn = c;
 784         op.o_connid = c->c_connid;
 785         op.o_tag = LDAP_REQ_ABANDON;
 786
 787         for ( o = LDAP_STAILQ_FIRST( &c->c_ops ); o; o=next ) {
 788                 next = LDAP_STAILQ_NEXT( o, o_next );
 789                 op.orn_msgid = o->o_msgid;
 790                 o->o_abandon = 1;
 791                 op.o_bd = frontendDB;
 792                 frontendDB->be_abandon( &op, &rs );
 793         }
 794
 795 #ifdef LDAP_X_TXN
 796         /* remove operations in pending transaction */
 797         while ( (o = LDAP_STAILQ_FIRST( &c->c_txn_ops )) != NULL) {
 798                 LDAP_STAILQ_REMOVE_HEAD( &c->c_txn_ops, o_next );
 799                 LDAP_STAILQ_NEXT(o, o_next) = NULL;
 800                 slap_op_free( o );
 801         }
 802
 803         /* clear transaction */
 804         c->c_txn_backend = NULL;
 805         c->c_txn = CONN_TXN_INACTIVE;
 806 #endif
 807
 808         /* remove pending operations */
 809         while ( (o = LDAP_STAILQ_FIRST( &c->c_pending_ops )) != NULL) {
 810                 LDAP_STAILQ_REMOVE_HEAD( &c->c_pending_ops, o_next );
 811                 LDAP_STAILQ_NEXT(o, o_next) = NULL;
 812                 slap_op_free( o );
 813         }
 814 }
 815
 816 void connection_closing( Connection *c, const char *why )
 817 {
 818         assert( connections != NULL );
 819         assert( c != NULL );
 820         assert( c->c_struct_state == SLAP_C_USED );
 821         assert( c->c_conn_state != SLAP_C_INVALID );
 822
 823         /* c_mutex must be locked by caller */
 824
 825         if( c->c_conn_state != SLAP_C_CLOSING ) {
 826                 ber_socket_t    sd;
 827
 828                 ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_GET_FD, &sd );
 829                 Debug( LDAP_DEBUG_TRACE,
 830                         "connection_closing: readying conn=%lu sd=%d for close\n",
 831                         c->c_connid, sd, 0 );
 832                 /* update state to closing */
 833                 c->c_conn_state = SLAP_C_CLOSING;
 834                 c->c_close_reason = why;
 835
 836                 /* don't listen on this port anymore */
 837                 slapd_clr_read( sd, 0 );
 838
 839                 /* abandon active operations */
 840                 connection_abandon( c );
 841
 842                 /* wake write blocked operations */
 843                 if ( c->c_writewaiter ) {
 844                         ldap_pvt_thread_cond_signal( &c->c_write_cv );
 845                         /* ITS#4667 this may allow another thread to drop into
 846                          * connection_resched / connection_close before we
 847                          * finish, but that's OK.
 848                          */
 849                         slapd_clr_write( sd, 1 );
 850                         ldap_pvt_thread_mutex_unlock( &c->c_mutex );
 851                         ldap_pvt_thread_mutex_lock( &c->c_write_mutex );
 852                         ldap_pvt_thread_mutex_lock( &c->c_mutex );
 853                         ldap_pvt_thread_mutex_unlock( &c->c_write_mutex );
 854                 } else {
 855                         slapd_clr_write( sd, 1 );
 856                 }
 857
 858         } else if( why == NULL && c->c_close_reason == conn_lost_str ) {
 859                 /* Client closed connection after doing Unbind. */
 860                 c->c_close_reason = NULL;
 861         }
 862 }
 863
 864 static void
 865 connection_close( Connection *c )
 866 {
 867         ber_socket_t    sd = AC_SOCKET_INVALID;
 868
 869         assert( connections != NULL );
 870         assert( c != NULL );
 871
 872         /* ITS#4667 we may have gotten here twice */
 873         if ( c->c_conn_state == SLAP_C_INVALID )
 874                 return;
 875
 876         assert( c->c_struct_state == SLAP_C_USED );
 877         assert( c->c_conn_state == SLAP_C_CLOSING );
 878
 879         /* NOTE: c_mutex should be locked by caller */
 880
 881         /* NOTE: don't get the file descriptor if not needed */
 882 #ifdef LDAP_DEBUG
 883         if ( slap_debug & LDAP_DEBUG_TRACE ) {
 884                 ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_GET_FD, &sd );
 885         }
 886 #endif /* LDAP_DEBUG */
 887
 888         if ( !LDAP_STAILQ_EMPTY(&c->c_ops) ||
 889                 !LDAP_STAILQ_EMPTY(&c->c_pending_ops) )
 890         {
 891                 Debug( LDAP_DEBUG_TRACE,
 892                         "connection_close: deferring conn=%lu sd=%d\n",
 893                         c->c_connid, sd, 0 );
 894                 return;
 895         }
 896
 897         Debug( LDAP_DEBUG_TRACE, "connection_close: conn=%lu sd=%d\n",
 898                 c->c_connid, sd, 0 );
 899
 900         connection_destroy( c );
 901 }
 902
 903 unsigned long connections_nextid(void)
 904 {
 905         unsigned long id;
 906         assert( connections != NULL );
 907
 908         ldap_pvt_thread_mutex_lock( &conn_nextid_mutex );
 909
 910         id = conn_nextid;
 911
 912         ldap_pvt_thread_mutex_unlock( &conn_nextid_mutex );
 913
 914         return id;
 915 }
 916
 917 Connection* connection_first( ber_socket_t *index )
 918 {
 919         assert( connections != NULL );
 920         assert( index != NULL );
 921
 922         ldap_pvt_thread_mutex_lock( &connections_mutex );
 923         for( *index = 0; *index < dtblsize; (*index)++) {
 924                 if( connections[*index].c_struct_state != SLAP_C_UNINITIALIZED ) {
 925                         break;
 926                 }
 927         }
 928         ldap_pvt_thread_mutex_unlock( &connections_mutex );
 929
 930         return connection_next(NULL, index);
 931 }
 932
 933 Connection* connection_next( Connection *c, ber_socket_t *index )
 934 {
 935         assert( connections != NULL );
 936         assert( index != NULL );
 937         assert( *index <= dtblsize );
 938
 939         if( c != NULL ) ldap_pvt_thread_mutex_unlock( &c->c_mutex );
 940
 941         c = NULL;
 942
 943         ldap_pvt_thread_mutex_lock( &connections_mutex );
 944         for(; *index < dtblsize; (*index)++) {
 945                 int c_struct;
 946                 if( connections[*index].c_struct_state == SLAP_C_UNINITIALIZED ) {
 947                         assert( connections[*index].c_conn_state == SLAP_C_INVALID );
 948 #ifdef HAVE_WINSOCK
 949                         break;
 950 #else
 951                         continue;
 952 #endif
 953                 }
 954
 955                 if( connections[*index].c_struct_state == SLAP_C_USED ) {
 956                         assert( connections[*index].c_conn_state != SLAP_C_INVALID );
 957                         c = &connections[(*index)++];
 958                         if ( ldap_pvt_thread_mutex_trylock( &c->c_mutex )) {
 959                                 /* avoid deadlock */
 960                                 ldap_pvt_thread_mutex_unlock( &connections_mutex );
 961                                 ldap_pvt_thread_mutex_lock( &c->c_mutex );
 962                                 ldap_pvt_thread_mutex_lock( &connections_mutex );
 963                                 if ( c->c_struct_state != SLAP_C_USED ) {
 964                                         ldap_pvt_thread_mutex_unlock( &c->c_mutex );
 965                                         c = NULL;
 966                                         continue;
 967                                 }
 968                         }
 969                         break;
 970                 }
 971
 972                 c_struct = connections[*index].c_struct_state;
 973                 if ( c_struct == SLAP_C_PENDING )
 974                         continue;
 975                 assert( c_struct == SLAP_C_UNUSED );
 976                 assert( connections[*index].c_conn_state == SLAP_C_INVALID );
 977         }
 978
 979         ldap_pvt_thread_mutex_unlock( &connections_mutex );
 980         return c;
 981 }
 982
 983 void connection_done( Connection *c )
 984 {
 985         assert( connections != NULL );
 986
 987         if( c != NULL ) ldap_pvt_thread_mutex_unlock( &c->c_mutex );
 988 }
 989
 990 /*
 991  * connection_activity - handle the request operation op on connection
 992  * conn.  This routine figures out what kind of operation it is and
 993  * calls the appropriate stub to handle it.
 994  */
 995
 996 #ifdef SLAPD_MONITOR
 997 /* FIXME: returns 0 in case of failure */
 998 #define INCR_OP_INITIATED(index) \
 999         do { \
1000                 ldap_pvt_thread_mutex_lock( &slap_counters.sc_ops_mutex ); \
1001                 ldap_pvt_mp_add_ulong(slap_counters.sc_ops_initiated_[(index)], 1); \
1002                 ldap_pvt_thread_mutex_unlock( &slap_counters.sc_ops_mutex ); \
1003         } while (0)
1004 #define INCR_OP_COMPLETED(index) \
1005         do { \
1006                 ldap_pvt_thread_mutex_lock( &slap_counters.sc_ops_mutex ); \
1007                 ldap_pvt_mp_add_ulong(slap_counters.sc_ops_completed, 1); \
1008                 ldap_pvt_mp_add_ulong(slap_counters.sc_ops_completed_[(index)], 1); \
1009                 ldap_pvt_thread_mutex_unlock( &slap_counters.sc_ops_mutex ); \
1010         } while (0)
1011 #else /* !SLAPD_MONITOR */
1012 #define INCR_OP_INITIATED(index) do { } while (0)
1013 #define INCR_OP_COMPLETED(index) \
1014         do { \
1015                 ldap_pvt_thread_mutex_lock( &slap_counters.sc_ops_mutex ); \
1016                 ldap_pvt_mp_add_ulong(slap_counters.sc_ops_completed, 1); \
1017                 ldap_pvt_thread_mutex_unlock( &slap_counters.sc_ops_mutex ); \
1018         } while (0)
1019 #endif /* !SLAPD_MONITOR */
1020
1021 /*
1022  * NOTE: keep in sync with enum in slapd.h
1023  */
1024 static BI_op_func *opfun[] = {
1025         do_bind,
1026         do_unbind,
1027         do_add,
1028         do_delete,
1029         do_modrdn,
1030         do_modify,
1031         do_compare,
1032         do_search,
1033         do_abandon,
1034         do_extended,
1035         NULL
1036 };
1037
1038 static void *
1039 connection_operation( void *ctx, void *arg_v )
1040 {
1041         int rc = LDAP_OTHER;
1042         Operation *op = arg_v;
1043         SlapReply rs = {REP_RESULT};
1044         ber_tag_t tag = op->o_tag;
1045         slap_op_t opidx = SLAP_OP_LAST;
1046         Connection *conn = op->o_conn;
1047         void *memctx = NULL;
1048         void *memctx_null = NULL;
1049         ber_len_t memsiz;
1050
1051         ldap_pvt_thread_mutex_lock( &slap_counters.sc_ops_mutex );
1052         /* FIXME: returns 0 in case of failure */
1053         ldap_pvt_mp_add_ulong(slap_counters.sc_ops_initiated, 1);
1054         ldap_pvt_thread_mutex_unlock( &slap_counters.sc_ops_mutex );
1055
1056         op->o_threadctx = ctx;
1057 #ifdef LDAP_DEVEL
1058         op->o_tid = ldap_pvt_thread_pool_tid( ctx );
1059 #endif /* LDAP_DEVEL */
1060
1061         switch ( tag ) {
1062         case LDAP_REQ_BIND:
1063         case LDAP_REQ_UNBIND:
1064         case LDAP_REQ_ADD:
1065         case LDAP_REQ_DELETE:
1066         case LDAP_REQ_MODDN:
1067         case LDAP_REQ_MODIFY:
1068         case LDAP_REQ_COMPARE:
1069         case LDAP_REQ_SEARCH:
1070         case LDAP_REQ_ABANDON:
1071         case LDAP_REQ_EXTENDED:
1072                 break;
1073         default:
1074                 Debug( LDAP_DEBUG_ANY, "connection_operation: "
1075                         "conn %lu unknown LDAP request 0x%lx\n",
1076                         conn->c_connid, tag, 0 );
1077                 op->o_tag = LBER_ERROR;
1078                 rs.sr_err = LDAP_PROTOCOL_ERROR;
1079                 rs.sr_text = "unknown LDAP request";
1080                 send_ldap_disconnect( op, &rs );
1081                 rc = SLAPD_DISCONNECT;
1082                 goto operations_error;
1083         }
1084
1085         if( conn->c_sasl_bind_in_progress && tag != LDAP_REQ_BIND ) {
1086                 Debug( LDAP_DEBUG_ANY, "connection_operation: "
1087                         "error: SASL bind in progress (tag=%ld).\n",
1088                         (long) tag, 0, 0 );
1089                 send_ldap_error( op, &rs, LDAP_OPERATIONS_ERROR,
1090                         "SASL bind in progress" );
1091                 rc = LDAP_OPERATIONS_ERROR;
1092                 goto operations_error;
1093         }
1094
1095 #ifdef LDAP_X_TXN
1096         if (( conn->c_txn == CONN_TXN_SPECIFY ) && (
1097                 ( tag == LDAP_REQ_ADD ) ||
1098                 ( tag == LDAP_REQ_DELETE ) ||
1099                 ( tag == LDAP_REQ_MODIFY ) ||
1100                 ( tag == LDAP_REQ_MODRDN )))
1101         {
1102                 /* Disable SLAB allocator for all update operations
1103                         issued inside of a transaction */
1104                 op->o_tmpmemctx = NULL;
1105                 op->o_tmpmfuncs = &ch_mfuncs;
1106         } else
1107 #endif
1108         {
1109         /* We can use Thread-Local storage for most mallocs. We can
1110          * also use TL for ber parsing, but not on Add or Modify.
1111          */
1112 #if 0
1113         memsiz = ber_len( op->o_ber ) * 64;
1114         if ( SLAP_SLAB_SIZE > memsiz ) memsiz = SLAP_SLAB_SIZE;
1115 #endif
1116         memsiz = SLAP_SLAB_SIZE;
1117
1118         memctx = slap_sl_mem_create( memsiz, SLAP_SLAB_STACK, ctx );
1119         op->o_tmpmemctx = memctx;
1120         op->o_tmpmfuncs = &slap_sl_mfuncs;
1121         if ( tag != LDAP_REQ_ADD && tag != LDAP_REQ_MODIFY ) {
1122                 /* Note - the ber and its buffer are already allocated from
1123                  * regular memory; this only affects subsequent mallocs that
1124                  * ber_scanf may invoke.
1125                  */
1126                 ber_set_option( op->o_ber, LBER_OPT_BER_MEMCTX, &memctx );
1127         }
1128         }
1129
1130         opidx = slap_req2op( tag );
1131         assert( opidx != SLAP_OP_LAST );
1132         INCR_OP_INITIATED( opidx );
1133         rc = (*(opfun[opidx]))( op, &rs );
1134
1135 operations_error:
1136         if ( rc == SLAPD_DISCONNECT ) {
1137                 tag = LBER_ERROR;
1138
1139         } else if ( opidx != SLAP_OP_LAST ) {
1140                 /* increment completed operations count
1141                  * only if operation was initiated
1142                  * and rc != SLAPD_DISCONNECT */
1143                 INCR_OP_COMPLETED( opidx );
1144         }
1145
1146         if ( op->o_cancel == SLAP_CANCEL_REQ ) {
1147                 if ( rc == SLAPD_ABANDON ) {
1148                         op->o_cancel = SLAP_CANCEL_ACK;
1149                 } else {
1150                         op->o_cancel = LDAP_TOO_LATE;
1151                 }
1152         }
1153
1154         while ( op->o_cancel != SLAP_CANCEL_NONE &&
1155                 op->o_cancel != SLAP_CANCEL_DONE )
1156         {
1157                 ldap_pvt_thread_yield();
1158         }
1159
1160         ldap_pvt_thread_mutex_lock( &conn->c_mutex );
1161
1162         ber_set_option( op->o_ber, LBER_OPT_BER_MEMCTX, &memctx_null );
1163
1164         LDAP_STAILQ_REMOVE( &conn->c_ops, op, slap_op, o_next);
1165         LDAP_STAILQ_NEXT(op, o_next) = NULL;
1166         slap_op_free( op );
1167         conn->c_n_ops_executing--;
1168         conn->c_n_ops_completed++;
1169
1170         switch( tag ) {
1171         case LBER_ERROR:
1172         case LDAP_REQ_UNBIND:
1173                 /* c_mutex is locked */
1174                 connection_closing( conn,
1175                         tag == LDAP_REQ_UNBIND ? NULL : "operations error" );
1176                 break;
1177         }
1178
1179         connection_resched( conn );
1180         ldap_pvt_thread_mutex_unlock( &conn->c_mutex );
1181         return NULL;
1182 }
1183
1184 static const Listener dummy_list = { BER_BVC(""), BER_BVC("") };
1185
1186 int connection_client_setup(
1187         ber_socket_t s,
1188         ldap_pvt_thread_start_t *func,
1189         void *arg )
1190 {
1191         int rc;
1192         Connection *c;
1193
1194         rc = connection_init( s, (Listener *)&dummy_list, "", "",
1195                 CONN_IS_CLIENT, 0, NULL );
1196         if ( rc < 0 ) return -1;
1197
1198         c = connection_get( s );
1199         c->c_clientfunc = func;
1200         c->c_clientarg = arg;
1201
1202         slapd_add_internal( s, 0 );
1203         slapd_set_read( s, 1 );
1204         connection_return( c );
1205         return 0;
1206 }
1207
1208 void connection_client_enable(
1209         ber_socket_t s )
1210 {
1211         slapd_set_read( s, 1 );
1212 }
1213
1214 void connection_client_stop(
1215         ber_socket_t s )
1216 {
1217         Connection *c;
1218         Sockbuf *sb;
1219
1220         /* get (locked) connection */
1221         c = connection_get( s );
1222
1223         assert( c->c_conn_state == SLAP_C_CLIENT );
1224
1225         c->c_listener = NULL;
1226         c->c_conn_state = SLAP_C_INVALID;
1227         c->c_struct_state = SLAP_C_UNUSED;
1228         c->c_close_reason = "?";                        /* should never be needed */
1229         sb = c->c_sb;
1230         c->c_sb = ber_sockbuf_alloc( );
1231         {
1232                 ber_len_t max = sockbuf_max_incoming;
1233                 ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_SET_MAX_INCOMING, &max );
1234         }
1235         slapd_remove( s, sb, 0, 1, 0 );
1236
1237         connection_return( c );
1238 }
1239
1240 #ifdef SLAP_LIGHTWEIGHT_DISPATCHER
1241
1242 static int connection_read( ber_socket_t s, conn_readinfo *cri );
1243
1244 static void* connection_read_thread( void* ctx, void* argv )
1245 {
1246         int rc ;
1247         conn_readinfo cri = { NULL, NULL, NULL, 0 };
1248         ber_socket_t s = (long)argv;
1249
1250         /*
1251          * read incoming LDAP requests. If there is more than one,
1252          * the first one is returned with new_op
1253          */
1254         if( ( rc = connection_read( s, &cri ) ) < 0 ) {
1255                 Debug( LDAP_DEBUG_CONNS, "connection_read(%d) error\n", s, 0, 0 );
1256                 return (void*)(long)rc;
1257         }
1258
1259         /* execute a single queued request in the same thread */
1260         if( cri.op && !cri.nullop ) {
1261                 rc = (long)connection_operation( ctx, cri.op );
1262         } else if ( cri.func ) {
1263                 rc = (long)cri.func( ctx, cri.arg );
1264         }
1265
1266         return (void*)(long)rc;
1267 }
1268
1269 int connection_read_activate( ber_socket_t s )
1270 {
1271         int rc;
1272
1273         /*
1274          * suspend reading on this file descriptor until a connection processing
1275          * thread reads data on it. Otherwise the listener thread will repeatedly
1276          * submit the same event on it to the pool.
1277          */
1278         rc = slapd_clr_read( s, 0 );
1279         if ( rc )
1280                 return rc;
1281
1282         rc = ldap_pvt_thread_pool_submit( &connection_pool,
1283                 connection_read_thread, (void *)(long)s );
1284
1285         if( rc != 0 ) {
1286                 Debug( LDAP_DEBUG_ANY,
1287                         "connection_read_activate(%d): submit failed (%d)\n",
1288                         s, rc, 0 );
1289         }
1290
1291         return rc;
1292 }
1293 #endif
1294
1295 #ifdef SLAP_LIGHTWEIGHT_DISPATCHER
1296 static int
1297 connection_read( ber_socket_t s, conn_readinfo *cri )
1298 #else
1299 int connection_read(ber_socket_t s)
1300 #endif
1301 {
1302         int rc = 0;
1303         Connection *c;
1304
1305         assert( connections != NULL );
1306
1307         /* get (locked) connection */
1308         c = connection_get( s );
1309
1310         if( c == NULL ) {
1311                 Debug( LDAP_DEBUG_ANY,
1312                         "connection_read(%ld): no connection!\n",
1313                         (long) s, 0, 0 );
1314
1315                 return -1;
1316         }
1317
1318         c->c_n_read++;
1319
1320         if( c->c_conn_state == SLAP_C_CLOSING ) {
1321                 Debug( LDAP_DEBUG_TRACE,
1322                         "connection_read(%d): closing, ignoring input for id=%lu\n",
1323                         s, c->c_connid, 0 );
1324                 connection_return( c );
1325                 return 0;
1326         }
1327
1328         if ( c->c_conn_state == SLAP_C_CLIENT ) {
1329 #ifdef SLAP_LIGHTWEIGHT_DISPATCHER
1330                 cri->func = c->c_clientfunc;
1331                 cri->arg = c->c_clientarg;
1332                 /* read should already be cleared */
1333 #else
1334                 slapd_clr_read( s, 0 );
1335                 ldap_pvt_thread_pool_submit( &connection_pool,
1336                         c->c_clientfunc, c->c_clientarg );
1337 #endif
1338                 connection_return( c );
1339                 return 0;
1340         }
1341
1342         Debug( LDAP_DEBUG_TRACE,
1343                 "connection_read(%d): checking for input on id=%lu\n",
1344                 s, c->c_connid, 0 );
1345
1346 #ifdef HAVE_TLS
1347         if ( c->c_is_tls && c->c_needs_tls_accept ) {
1348                 rc = ldap_pvt_tls_accept( c->c_sb, slap_tls_ctx );
1349                 if ( rc < 0 ) {
1350                         Debug( LDAP_DEBUG_TRACE,
1351                                 "connection_read(%d): TLS accept failure "
1352                                 "error=%d id=%lu, closing\n",
1353                                 s, rc, c->c_connid );
1354
1355                         c->c_needs_tls_accept = 0;
1356                         /* c_mutex is locked */
1357                         connection_closing( c, "TLS negotiation failure" );
1358                         connection_close( c );
1359                         connection_return( c );
1360                         return 0;
1361
1362                 } else if ( rc == 0 ) {
1363                         void *ssl;
1364                         struct berval authid = BER_BVNULL;
1365
1366                         c->c_needs_tls_accept = 0;
1367
1368                         /* we need to let SASL know */
1369                         ssl = ldap_pvt_tls_sb_ctx( c->c_sb );
1370
1371                         c->c_tls_ssf = (slap_ssf_t) ldap_pvt_tls_get_strength( ssl );
1372                         if( c->c_tls_ssf > c->c_ssf ) {
1373                                 c->c_ssf = c->c_tls_ssf;
1374                         }
1375
1376                         rc = dnX509peerNormalize( ssl, &authid );
1377                         if ( rc != LDAP_SUCCESS ) {
1378                                 Debug( LDAP_DEBUG_TRACE, "connection_read(%d): "
1379                                         "unable to get TLS client DN, error=%d id=%lu\n",
1380                                         s, rc, c->c_connid );
1381                         }
1382                         Statslog( LDAP_DEBUG_STATS,
1383                                 "conn=%lu fd=%d TLS established tls_ssf=%u ssf=%u\n",
1384                             c->c_connid, (int) s, c->c_tls_ssf, c->c_ssf, 0 );
1385                         slap_sasl_external( c, c->c_tls_ssf, &authid );
1386                         if ( authid.bv_val ) free( authid.bv_val );
1387                 }
1388
1389                 /* if success and data is ready, fall thru to data input loop */
1390                 if( !ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_DATA_READY, NULL ) )
1391                 {
1392 #ifdef SLAP_LIGHTWEIGHT_DISPATCHER
1393                         slapd_set_read( s, 1 );
1394 #endif
1395
1396                         connection_return( c );
1397                         return 0;
1398                 }
1399         }
1400 #endif
1401
1402 #ifdef HAVE_CYRUS_SASL
1403         if ( c->c_sasl_layers ) {
1404                 /* If previous layer is not removed yet, give up for now */
1405                 if ( !c->c_sasl_sockctx ) {
1406 #ifdef SLAP_LIGHTWEIGHT_DISPATCHER
1407                         slapd_set_read( s, 1 );
1408 #endif
1409
1410                         connection_return( c );
1411                         return 0;
1412                 }
1413
1414                 c->c_sasl_layers = 0;
1415
1416                 rc = ldap_pvt_sasl_install( c->c_sb, c->c_sasl_sockctx );
1417                 if( rc != LDAP_SUCCESS ) {
1418                         Debug( LDAP_DEBUG_TRACE,
1419                                 "connection_read(%d): SASL install error "
1420                                 "error=%d id=%lu, closing\n",
1421                                 s, rc, c->c_connid );
1422
1423                         /* c_mutex is locked */
1424                         connection_closing( c, "SASL layer install failure" );
1425                         connection_close( c );
1426                         connection_return( c );
1427                         return 0;
1428                 }
1429         }
1430 #endif
1431
1432 #define CONNECTION_INPUT_LOOP 1
1433 /* #define      DATA_READY_LOOP 1 */
1434
1435         do {
1436                 /* How do we do this without getting into a busy loop ? */
1437 #ifdef SLAP_LIGHTWEIGHT_DISPATCHER
1438                 rc = connection_input( c, cri );
1439 #else
1440                 rc = connection_input( c );
1441 #endif
1442         }
1443 #ifdef DATA_READY_LOOP
1444         while( !rc && ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_DATA_READY, NULL ));
1445 #elif CONNECTION_INPUT_LOOP
1446         while(!rc);
1447 #else
1448         while(0);
1449 #endif
1450
1451         if( rc < 0 ) {
1452                 Debug( LDAP_DEBUG_CONNS,
1453                         "connection_read(%d): input error=%d id=%lu, closing.\n",
1454                         s, rc, c->c_connid );
1455
1456                 /* c_mutex is locked */
1457                 connection_closing( c, conn_lost_str );
1458                 connection_close( c );
1459                 connection_return( c );
1460                 return 0;
1461         }
1462
1463 #ifdef SLAP_LIGHTWEIGHT_DISPATCHER
1464         if ( ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_NEEDS_WRITE, NULL ) ) {
1465                 slapd_set_write( s, 0 );
1466         }
1467
1468         slapd_set_read( s, 1 );
1469 #else
1470         if ( ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_NEEDS_READ, NULL ) ) {
1471                 slapd_set_read( s, 1 );
1472         }
1473
1474         if ( ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_NEEDS_WRITE, NULL ) ) {
1475                 slapd_set_write( s, 1 );
1476         }
1477 #endif
1478
1479         connection_return( c );
1480
1481         return 0;
1482 }
1483
1484 static int
1485 #ifdef SLAP_LIGHTWEIGHT_DISPATCHER
1486 connection_input( Connection *conn , conn_readinfo *cri )
1487 #else
1488 connection_input( Connection *conn )
1489 #endif
1490 {
1491         Operation *op;
1492         ber_tag_t       tag;
1493         ber_len_t       len;
1494         ber_int_t       msgid;
1495         BerElement      *ber;
1496         int             rc;
1497 #ifdef LDAP_CONNECTIONLESS
1498         Sockaddr        peeraddr;
1499         char            *cdn = NULL;
1500 #endif
1501         char *defer = NULL;
1502
1503         if ( conn->c_currentber == NULL &&
1504                 ( conn->c_currentber = ber_alloc()) == NULL )
1505         {
1506                 Debug( LDAP_DEBUG_ANY, "ber_alloc failed\n", 0, 0, 0 );
1507                 return -1;
1508         }
1509
1510         sock_errset(0);
1511
1512 #ifdef LDAP_CONNECTIONLESS
1513         if ( conn->c_is_udp ) {
1514                 char peername[sizeof("IP=255.255.255.255:65336")];
1515
1516                 len = ber_int_sb_read(conn->c_sb, &peeraddr, sizeof(struct sockaddr));
1517                 if (len != sizeof(struct sockaddr)) return 1;
1518
1519                 sprintf( peername, "IP=%s:%d",
1520                         inet_ntoa( peeraddr.sa_in_addr.sin_addr ),
1521                         (unsigned) ntohs( peeraddr.sa_in_addr.sin_port ) );
1522                 Statslog( LDAP_DEBUG_STATS,
1523                         "conn=%lu UDP request from %s (%s) accepted.\n",
1524                         conn->c_connid, peername, conn->c_sock_name.bv_val, 0, 0 );
1525         }
1526 #endif
1527
1528         tag = ber_get_next( conn->c_sb, &len, conn->c_currentber );
1529         if ( tag != LDAP_TAG_MESSAGE ) {
1530                 int err = sock_errno();
1531                 ber_socket_t    sd;
1532
1533                 ber_sockbuf_ctrl( conn->c_sb, LBER_SB_OPT_GET_FD, &sd );
1534
1535                 if ( err != EWOULDBLOCK && err != EAGAIN ) {
1536                         /* log, close and send error */
1537                 Debug( LDAP_DEBUG_TRACE,
1538                         "ber_get_next on fd %d failed errno=%d (%s)\n",
1539                         sd, err, sock_errstr(err) );
1540                         ber_free( conn->c_currentber, 1 );
1541                         conn->c_currentber = NULL;
1542
1543                         return -2;
1544                 }
1545                 return 1;
1546         }
1547
1548         ber = conn->c_currentber;
1549         conn->c_currentber = NULL;
1550
1551         if ( (tag = ber_get_int( ber, &msgid )) != LDAP_TAG_MSGID ) {
1552                 /* log, close and send error */
1553                 Debug( LDAP_DEBUG_ANY, "ber_get_int returns 0x%lx\n", tag, 0, 0 );
1554                 ber_free( ber, 1 );
1555                 return -1;
1556         }
1557
1558         if ( (tag = ber_peek_tag( ber, &len )) == LBER_ERROR ) {
1559                 /* log, close and send error */
1560                 Debug( LDAP_DEBUG_ANY, "ber_peek_tag returns 0x%lx\n", tag, 0, 0 );
1561                 ber_free( ber, 1 );
1562
1563                 return -1;
1564         }
1565
1566 #ifdef LDAP_CONNECTIONLESS
1567         if( conn->c_is_udp ) {
1568                 if( tag == LBER_OCTETSTRING ) {
1569                         ber_get_stringa( ber, &cdn );
1570                         tag = ber_peek_tag(ber, &len);
1571                 }
1572                 if( tag != LDAP_REQ_ABANDON && tag != LDAP_REQ_SEARCH ) {
1573                         Debug( LDAP_DEBUG_ANY, "invalid req for UDP 0x%lx\n", tag, 0, 0 );
1574                         ber_free( ber, 1 );
1575                         return 0;
1576                 }
1577         }
1578 #endif
1579
1580         if(tag == LDAP_REQ_BIND) {
1581                 /* immediately abandon all existing operations upon BIND */
1582                 connection_abandon( conn );
1583         }
1584
1585         op = slap_op_alloc( ber, msgid, tag, conn->c_n_ops_received++ );
1586
1587         op->o_conn = conn;
1588         /* clear state if the connection is being reused from inactive */
1589         if ( conn->c_conn_state == SLAP_C_INACTIVE ) {
1590                 memset( &conn->c_pagedresults_state, 0,
1591                         sizeof( conn->c_pagedresults_state ) );
1592         }
1593
1594         op->o_res_ber = NULL;
1595
1596 #ifdef LDAP_CONNECTIONLESS
1597         if (conn->c_is_udp) {
1598                 if ( cdn ) {
1599                         ber_str2bv( cdn, 0, 1, &op->o_dn );
1600                         op->o_protocol = LDAP_VERSION2;
1601                 }
1602                 op->o_res_ber = ber_alloc_t( LBER_USE_DER );
1603                 if (op->o_res_ber == NULL) return 1;
1604
1605                 rc = ber_write( op->o_res_ber, (char *)&peeraddr,
1606                         sizeof(struct sockaddr), 0 );
1607
1608                 if (rc != sizeof(struct sockaddr)) {
1609                         Debug( LDAP_DEBUG_ANY, "ber_write failed\n", 0, 0, 0 );
1610                         return 1;
1611                 }
1612
1613                 if (op->o_protocol == LDAP_VERSION2) {
1614                         rc = ber_printf(op->o_res_ber, "{is{" /*}}*/, op->o_msgid, "");
1615                         if (rc == -1) {
1616                                 Debug( LDAP_DEBUG_ANY, "ber_write failed\n", 0, 0, 0 );
1617                                 return rc;
1618                         }
1619                 }
1620         }
1621 #endif /* LDAP_CONNECTIONLESS */
1622
1623         rc = 0;
1624
1625         /* Don't process requests when the conn is in the middle of a
1626          * Bind, or if it's closing. Also, don't let any single conn
1627          * use up all the available threads, and don't execute if we're
1628          * currently blocked on output. And don't execute if there are
1629          * already pending ops, let them go first.  Abandon operations
1630          * get exceptions to some, but not all, cases.
1631          */
1632         switch( tag ){
1633         default:
1634                 /* Abandon and Unbind are exempt from these checks */
1635                 if (conn->c_conn_state == SLAP_C_CLOSING) {
1636                         defer = "closing";
1637                         break;
1638                 } else if (conn->c_writewaiter) {
1639                         defer = "awaiting write";
1640                         break;
1641                 } else if (conn->c_n_ops_pending) {
1642                         defer = "pending operations";
1643                         break;
1644                 }
1645                 /* FALLTHRU */
1646         case LDAP_REQ_ABANDON:
1647                 /* Unbind is exempt from these checks */
1648                 if (conn->c_n_ops_executing >= connection_pool_max/2) {
1649                         defer = "too many executing";
1650                         break;
1651                 } else if (conn->c_conn_state == SLAP_C_BINDING) {
1652                         defer = "binding";
1653                         break;
1654                 }
1655                 /* FALLTHRU */
1656         case LDAP_REQ_UNBIND:
1657                 break;
1658         }
1659
1660         if( defer ) {
1661                 int max = conn->c_dn.bv_len
1662                         ? slap_conn_max_pending_auth
1663                         : slap_conn_max_pending;
1664
1665                 Debug( LDAP_DEBUG_ANY,
1666                         "connection_input: conn=%lu deferring operation: %s\n",
1667                         conn->c_connid, defer, 0 );
1668                 conn->c_n_ops_pending++;
1669                 LDAP_STAILQ_INSERT_TAIL( &conn->c_pending_ops, op, o_next );
1670                 rc = ( conn->c_n_ops_pending > max ) ? -1 : 0;
1671
1672         } else {
1673                 conn->c_n_ops_executing++;
1674
1675 #ifdef SLAP_LIGHTWEIGHT_DISPATCHER
1676                 /*
1677                  * The first op will be processed in the same thread context,
1678                  * as long as there is only one op total.
1679                  * Subsequent ops will be submitted to the pool by
1680                  * calling connection_op_activate()
1681                  */
1682                 if ( cri->op == NULL ) {
1683                         /* the first incoming request */
1684                         connection_op_queue( op );
1685                         cri->op = op;
1686                 } else {
1687                         if ( !cri->nullop ) {
1688                                 cri->nullop = 1;
1689                                 rc = ldap_pvt_thread_pool_submit( &connection_pool,
1690                                         connection_operation, (void *) cri->op );
1691                         }
1692                         connection_op_activate( op );
1693                 }
1694 #else
1695                 connection_op_activate( op );
1696 #endif
1697         }
1698
1699 #ifdef NO_THREADS
1700         if ( conn->c_struct_state != SLAP_C_USED ) {
1701                 /* connection must have got closed underneath us */
1702                 return 1;
1703         }
1704 #endif
1705
1706         assert( conn->c_struct_state == SLAP_C_USED );
1707         return rc;
1708 }
1709
1710 static int
1711 connection_resched( Connection *conn )
1712 {
1713         Operation *op;
1714
1715         if( conn->c_conn_state == SLAP_C_CLOSING ) {
1716                 ber_socket_t    sd;
1717                 ber_sockbuf_ctrl( conn->c_sb, LBER_SB_OPT_GET_FD, &sd );
1718
1719                 Debug( LDAP_DEBUG_TRACE, "connection_resched: "
1720                         "attempting closing conn=%lu sd=%d\n",
1721                         conn->c_connid, sd, 0 );
1722                 connection_close( conn );
1723                 return 0;
1724         }
1725
1726         if( conn->c_conn_state != SLAP_C_ACTIVE || conn->c_writewaiter ) {
1727                 /* other states need different handling */
1728                 return 0;
1729         }
1730
1731         while ((op = LDAP_STAILQ_FIRST( &conn->c_pending_ops )) != NULL) {
1732                 if ( conn->c_n_ops_executing > connection_pool_max/2 ) break;
1733
1734                 LDAP_STAILQ_REMOVE_HEAD( &conn->c_pending_ops, o_next );
1735                 LDAP_STAILQ_NEXT(op, o_next) = NULL;
1736
1737                 /* pending operations should not be marked for abandonment */
1738                 assert(!op->o_abandon);
1739
1740                 conn->c_n_ops_pending--;
1741                 conn->c_n_ops_executing++;
1742
1743                 connection_op_activate( op );
1744
1745                 if ( conn->c_conn_state == SLAP_C_BINDING ) break;
1746         }
1747         return 0;
1748 }
1749
1750 static void
1751 connection_init_log_prefix( Operation *op )
1752 {
1753         if ( op->o_connid == (unsigned long)(-1) ) {
1754                 snprintf( op->o_log_prefix, sizeof( op->o_log_prefix ),
1755                         "conn=-1 op=%lu", op->o_opid );
1756
1757         } else {
1758                 snprintf( op->o_log_prefix, sizeof( op->o_log_prefix ),
1759                         "conn=%lu op=%lu", op->o_connid, op->o_opid );
1760         }
1761 }
1762
1763 static int connection_bind_cleanup_cb( Operation *op, SlapReply *rs )
1764 {
1765         op->o_conn->c_sasl_bindop = NULL;
1766
1767         ch_free( op->o_callback );
1768         op->o_callback = NULL;
1769
1770         return SLAP_CB_CONTINUE;
1771 }
1772
1773 static int connection_bind_cb( Operation *op, SlapReply *rs )
1774 {
1775         ldap_pvt_thread_mutex_lock( &op->o_conn->c_mutex );
1776         if ( op->o_conn->c_conn_state == SLAP_C_BINDING )
1777                 op->o_conn->c_conn_state = SLAP_C_ACTIVE;
1778         op->o_conn->c_sasl_bind_in_progress =
1779                 ( rs->sr_err == LDAP_SASL_BIND_IN_PROGRESS );
1780
1781         /* Moved here from bind.c due to ITS#4158 */
1782         op->o_conn->c_sasl_bindop = NULL;
1783         if ( op->orb_method == LDAP_AUTH_SASL ) {
1784                 if( rs->sr_err == LDAP_SUCCESS ) {
1785                         ber_dupbv(&op->o_conn->c_dn, &op->orb_edn);
1786                         if( !BER_BVISEMPTY( &op->orb_edn ) ) {
1787                                 /* edn is always normalized already */
1788                                 ber_dupbv( &op->o_conn->c_ndn, &op->o_conn->c_dn );
1789                         }
1790                         op->o_tmpfree( op->orb_edn.bv_val, op->o_tmpmemctx );
1791                         BER_BVZERO( &op->orb_edn );
1792                         op->o_conn->c_authmech = op->o_conn->c_sasl_bind_mech;
1793                         BER_BVZERO( &op->o_conn->c_sasl_bind_mech );
1794
1795                         op->o_conn->c_sasl_ssf = op->orb_ssf;
1796                         if( op->orb_ssf > op->o_conn->c_ssf ) {
1797                                 op->o_conn->c_ssf = op->orb_ssf;
1798                         }
1799
1800                         if( !BER_BVISEMPTY( &op->o_conn->c_dn ) ) {
1801                                 ber_len_t max = sockbuf_max_incoming_auth;
1802                                 ber_sockbuf_ctrl( op->o_conn->c_sb,
1803                                         LBER_SB_OPT_SET_MAX_INCOMING, &max );
1804                         }
1805
1806                         /* log authorization identity */
1807                         Statslog( LDAP_DEBUG_STATS,
1808                                 "%s BIND dn=\"%s\" mech=%s sasl_ssf=%d ssf=%d\n",
1809                                 op->o_log_prefix,
1810                                 BER_BVISNULL( &op->o_conn->c_dn ) ? "<empty>" : op->o_conn->c_dn.bv_val,
1811                                 op->o_conn->c_authmech.bv_val,
1812                                 op->orb_ssf, op->o_conn->c_ssf );
1813
1814                         Debug( LDAP_DEBUG_TRACE,
1815                                 "do_bind: SASL/%s bind: dn=\"%s\" sasl_ssf=%d\n",
1816                                 op->o_conn->c_authmech.bv_val,
1817                                 BER_BVISNULL( &op->o_conn->c_dn ) ? "<empty>" : op->o_conn->c_dn.bv_val,
1818                                 op->orb_ssf );
1819
1820                 } else if ( rs->sr_err != LDAP_SASL_BIND_IN_PROGRESS ) {
1821                         if ( !BER_BVISNULL( &op->o_conn->c_sasl_bind_mech ) ) {
1822                                 free( op->o_conn->c_sasl_bind_mech.bv_val );
1823                                 BER_BVZERO( &op->o_conn->c_sasl_bind_mech );
1824                         }
1825                 }
1826         }
1827         ldap_pvt_thread_mutex_unlock( &op->o_conn->c_mutex );
1828
1829         ch_free( op->o_callback );
1830         op->o_callback = NULL;
1831
1832         return SLAP_CB_CONTINUE;
1833 }
1834
1835 static void connection_op_queue( Operation *op )
1836 {
1837         ber_tag_t tag = op->o_tag;
1838
1839         if (tag == LDAP_REQ_BIND) {
1840                 slap_callback *sc = ch_calloc( 1, sizeof( slap_callback ));
1841                 sc->sc_response = connection_bind_cb;
1842                 sc->sc_cleanup = connection_bind_cleanup_cb;
1843                 sc->sc_next = op->o_callback;
1844                 op->o_callback = sc;
1845                 op->o_conn->c_conn_state = SLAP_C_BINDING;
1846         }
1847
1848         if (!op->o_dn.bv_len) {
1849                 op->o_authz = op->o_conn->c_authz;
1850                 if ( BER_BVISNULL( &op->o_conn->c_sasl_authz_dn )) {
1851                         ber_dupbv( &op->o_dn, &op->o_conn->c_dn );
1852                         ber_dupbv( &op->o_ndn, &op->o_conn->c_ndn );
1853                 } else {
1854                         ber_dupbv( &op->o_dn, &op->o_conn->c_sasl_authz_dn );
1855                         ber_dupbv( &op->o_ndn, &op->o_conn->c_sasl_authz_dn );
1856                 }
1857         }
1858
1859         op->o_authtype = op->o_conn->c_authtype;
1860         ber_dupbv( &op->o_authmech, &op->o_conn->c_authmech );
1861
1862         if (!op->o_protocol) {
1863                 op->o_protocol = op->o_conn->c_protocol
1864                         ? op->o_conn->c_protocol : LDAP_VERSION3;
1865         }
1866
1867         if (op->o_conn->c_conn_state == SLAP_C_INACTIVE &&
1868                 op->o_protocol > LDAP_VERSION2)
1869         {
1870                 op->o_conn->c_conn_state = SLAP_C_ACTIVE;
1871         }
1872
1873         op->o_connid = op->o_conn->c_connid;
1874         connection_init_log_prefix( op );
1875
1876         LDAP_STAILQ_INSERT_TAIL( &op->o_conn->c_ops, op, o_next );
1877 }
1878
1879 static int connection_op_activate( Operation *op )
1880 {
1881         int rc;
1882
1883         connection_op_queue( op );
1884
1885         rc = ldap_pvt_thread_pool_submit( &connection_pool,
1886                 connection_operation, (void *) op );
1887
1888         if ( rc != 0 ) {
1889                 Debug( LDAP_DEBUG_ANY,
1890                         "connection_op_activate: submit failed (%d) for conn=%lu\n",
1891                         rc, op->o_connid, 0 );
1892                 /* should move op to pending list */
1893         }
1894
1895         return rc;
1896 }
1897
1898 int connection_write(ber_socket_t s)
1899 {
1900         Connection *c;
1901         Operation *op;
1902
1903         assert( connections != NULL );
1904
1905         slapd_clr_write( s, 0 );
1906
1907         c = connection_get( s );
1908         if( c == NULL ) {
1909                 Debug( LDAP_DEBUG_ANY,
1910                         "connection_write(%ld): no connection!\n",
1911                         (long)s, 0, 0 );
1912                 return -1;
1913         }
1914
1915         c->c_n_write++;
1916
1917         Debug( LDAP_DEBUG_TRACE,
1918                 "connection_write(%d): waking output for id=%lu\n",
1919                 s, c->c_connid, 0 );
1920         ldap_pvt_thread_cond_signal( &c->c_write_cv );
1921
1922         if ( ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_NEEDS_READ, NULL ) ) {
1923                 slapd_set_read( s, 1 );
1924         }
1925         if ( ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_NEEDS_WRITE, NULL ) ) {
1926                 slapd_set_write( s, 1 );
1927         }
1928
1929         /* If there are ops pending because of a writewaiter,
1930          * start one up.
1931          */
1932         while ((op = LDAP_STAILQ_FIRST( &c->c_pending_ops )) != NULL) {
1933                 if ( !c->c_writewaiter ) break;
1934                 if ( c->c_n_ops_executing > connection_pool_max/2 ) break;
1935
1936                 LDAP_STAILQ_REMOVE_HEAD( &c->c_pending_ops, o_next );
1937                 LDAP_STAILQ_NEXT(op, o_next) = NULL;
1938
1939                 /* pending operations should not be marked for abandonment */
1940                 assert(!op->o_abandon);
1941
1942                 c->c_n_ops_pending--;
1943                 c->c_n_ops_executing++;
1944
1945                 connection_op_activate( op );
1946
1947                 break;
1948         }
1949
1950         connection_return( c );
1951         return 0;
1952 }
1953
1954 #ifdef LDAP_SLAPI
1955 typedef struct conn_fake_extblock {
1956         void *eb_conn;
1957         void *eb_op;
1958 } conn_fake_extblock;
1959
1960 static void
1961 connection_fake_destroy(
1962         void *key,
1963         void *data )
1964 {
1965         Connection conn = {0};
1966         Operation op = {0};
1967         Opheader ohdr = {0};
1968
1969         conn_fake_extblock *eb = data;
1970
1971         op.o_hdr = &ohdr;
1972         op.o_hdr->oh_extensions = eb->eb_op;
1973         conn.c_extensions = eb->eb_conn;
1974         op.o_conn = &conn;
1975         conn.c_connid = -1;
1976         op.o_connid = -1;
1977
1978         ber_memfree_x( eb, NULL );
1979         slapi_int_free_object_extensions( SLAPI_X_EXT_OPERATION, &op );
1980         slapi_int_free_object_extensions( SLAPI_X_EXT_CONNECTION, &conn );
1981 }
1982 #endif
1983
1984 void
1985 connection_fake_init(
1986         Connection *conn,
1987         Operation *op,
1988         void *ctx )
1989 {
1990         conn->c_connid = -1;
1991         conn->c_send_ldap_result = slap_send_ldap_result;
1992         conn->c_send_search_entry = slap_send_search_entry;
1993         conn->c_send_search_reference = slap_send_search_reference;
1994         conn->c_listener = (Listener *)&dummy_list;
1995         conn->c_peer_domain = slap_empty_bv;
1996         conn->c_peer_name = slap_empty_bv;
1997
1998         memset(op, 0, OPERATION_BUFFER_SIZE);
1999         op->o_hdr = (Opheader *)(op+1);
2000         op->o_controls = (void **)(op->o_hdr+1);
2001         /* set memory context */
2002         op->o_tmpmemctx = slap_sl_mem_create(SLAP_SLAB_SIZE, SLAP_SLAB_STACK, ctx);
2003         op->o_tmpmfuncs = &slap_sl_mfuncs;
2004         op->o_threadctx = ctx;
2005 #ifdef LDAP_DEVEL
2006         op->o_tid = ldap_pvt_thread_pool_tid( ctx );
2007 #endif /* LDAP_DEVEL */
2008
2009         op->o_conn = conn;
2010         op->o_connid = op->o_conn->c_connid;
2011         connection_init_log_prefix( op );
2012
2013 #ifdef LDAP_SLAPI
2014         if ( slapi_plugins_used ) {
2015                 conn_fake_extblock *eb = NULL;
2016
2017                 /* Use thread keys to make sure these eventually get cleaned up */
2018                 if ( ldap_pvt_thread_pool_getkey( ctx, connection_fake_init, &eb,
2019                         NULL )) {
2020                         eb = ch_malloc( sizeof( *eb ));
2021                         slapi_int_create_object_extensions( SLAPI_X_EXT_CONNECTION, conn );
2022                         slapi_int_create_object_extensions( SLAPI_X_EXT_OPERATION, op );
2023                         eb->eb_conn = conn->c_extensions;
2024                         eb->eb_op = op->o_hdr->oh_extensions;
2025                         ldap_pvt_thread_pool_setkey( ctx, connection_fake_init, eb,
2026                                 connection_fake_destroy );
2027                 } else {
2028                         conn->c_extensions = eb->eb_conn;
2029                         op->o_hdr->oh_extensions = eb->eb_op;
2030                 }
2031         }
2032 #endif /* LDAP_SLAPI */
2033
2034         slap_op_time( &op->o_time, &op->o_tincr );
2035 }
2036
2037 void
2038 connection_assign_nextid( Connection *conn )
2039 {
2040         ldap_pvt_thread_mutex_lock( &conn_nextid_mutex );
2041         conn->c_connid = conn_nextid++;
2042         ldap_pvt_thread_mutex_unlock( &conn_nextid_mutex );
2043 }