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         slapd_sd_lock();
 735
 736         ber_sockbuf_free( sb );
 737
 738         /* c must be fully reset by this point; when we call slapd_remove
 739          * it may get immediately reused by a new connection.
 740          */
 741         if ( sd != AC_SOCKET_INVALID ) {
 742                 slapd_remove( sd, 1, 0, 1 );
 743
 744                 Statslog( LDAP_DEBUG_STATS, (close_reason
 745                                                                          ? "conn=%lu fd=%ld closed (%s)\n"
 746                                                                          : "conn=%lu fd=%ld closed\n"),
 747                         connid, (long) sd, close_reason, 0, 0 );
 748         } else {
 749                 slapd_sd_unlock();
 750         }
 751 }
 752
 753 int connection_state_closing( Connection *c )
 754 {
 755         /* c_mutex must be locked by caller */
 756
 757         int state;
 758         assert( c != NULL );
 759         assert( c->c_struct_state == SLAP_C_USED );
 760
 761         state = c->c_conn_state;
 762
 763         assert( state != SLAP_C_INVALID );
 764
 765         return state == SLAP_C_CLOSING;
 766 }
 767
 768 static void connection_abandon( Connection *c )
 769 {
 770         /* c_mutex must be locked by caller */
 771
 772         Operation *o, *next, op = {0};
 773         Opheader ohdr = {0};
 774         SlapReply rs = {0};
 775
 776         op.o_hdr = &ohdr;
 777         op.o_conn = c;
 778         op.o_connid = c->c_connid;
 779         op.o_tag = LDAP_REQ_ABANDON;
 780
 781         for ( o = LDAP_STAILQ_FIRST( &c->c_ops ); o; o=next ) {
 782                 next = LDAP_STAILQ_NEXT( o, o_next );
 783                 op.orn_msgid = o->o_msgid;
 784                 o->o_abandon = 1;
 785                 op.o_bd = frontendDB;
 786                 frontendDB->be_abandon( &op, &rs );
 787         }
 788
 789 #ifdef LDAP_X_TXN
 790         /* remove operations in pending transaction */
 791         while ( (o = LDAP_STAILQ_FIRST( &c->c_txn_ops )) != NULL) {
 792                 LDAP_STAILQ_REMOVE_HEAD( &c->c_txn_ops, o_next );
 793                 LDAP_STAILQ_NEXT(o, o_next) = NULL;
 794                 slap_op_free( o );
 795         }
 796
 797         /* clear transaction */
 798         c->c_txn_backend = NULL;
 799         c->c_txn = CONN_TXN_INACTIVE;
 800 #endif
 801
 802         /* remove pending operations */
 803         while ( (o = LDAP_STAILQ_FIRST( &c->c_pending_ops )) != NULL) {
 804                 LDAP_STAILQ_REMOVE_HEAD( &c->c_pending_ops, o_next );
 805                 LDAP_STAILQ_NEXT(o, o_next) = NULL;
 806                 slap_op_free( o );
 807         }
 808 }
 809
 810 void connection_closing( Connection *c, const char *why )
 811 {
 812         assert( connections != NULL );
 813         assert( c != NULL );
 814         assert( c->c_struct_state == SLAP_C_USED );
 815         assert( c->c_conn_state != SLAP_C_INVALID );
 816
 817         /* c_mutex must be locked by caller */
 818
 819         if( c->c_conn_state != SLAP_C_CLOSING ) {
 820                 ber_socket_t    sd;
 821
 822                 ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_GET_FD, &sd );
 823                 Debug( LDAP_DEBUG_TRACE,
 824                         "connection_closing: readying conn=%lu sd=%d for close\n",
 825                         c->c_connid, sd, 0 );
 826                 /* update state to closing */
 827                 c->c_conn_state = SLAP_C_CLOSING;
 828                 c->c_close_reason = why;
 829
 830                 /* don't listen on this port anymore */
 831                 slapd_clr_read( sd, 0 );
 832
 833                 /* abandon active operations */
 834                 connection_abandon( c );
 835
 836                 /* wake write blocked operations */
 837                 slapd_clr_write( sd, 1 );
 838                 if ( c->c_writewaiter ) {
 839                         ldap_pvt_thread_cond_signal( &c->c_write_cv );
 840                 }
 841
 842         } else if( why == NULL && c->c_close_reason == conn_lost_str ) {
 843                 /* Client closed connection after doing Unbind. */
 844                 c->c_close_reason = NULL;
 845         }
 846 }
 847
 848 static void connection_close( Connection *c )
 849 {
 850         ber_socket_t    sd;
 851
 852         assert( connections != NULL );
 853         assert( c != NULL );
 854         assert( c->c_struct_state == SLAP_C_USED );
 855         assert( c->c_conn_state == SLAP_C_CLOSING );
 856
 857         /* note: c_mutex should be locked by caller */
 858
 859         ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_GET_FD, &sd );
 860         if( !LDAP_STAILQ_EMPTY(&c->c_ops) ) {
 861                 Debug( LDAP_DEBUG_TRACE,
 862                         "connection_close: deferring conn=%lu sd=%d\n",
 863                         c->c_connid, sd, 0 );
 864                 return;
 865         }
 866
 867         Debug( LDAP_DEBUG_TRACE, "connection_close: conn=%lu sd=%d\n",
 868                 c->c_connid, sd, 0 );
 869         connection_destroy( c );
 870 }
 871
 872 unsigned long connections_nextid(void)
 873 {
 874         unsigned long id;
 875         assert( connections != NULL );
 876
 877         ldap_pvt_thread_mutex_lock( &conn_nextid_mutex );
 878
 879         id = conn_nextid;
 880
 881         ldap_pvt_thread_mutex_unlock( &conn_nextid_mutex );
 882
 883         return id;
 884 }
 885
 886 Connection* connection_first( ber_socket_t *index )
 887 {
 888         assert( connections != NULL );
 889         assert( index != NULL );
 890
 891         ldap_pvt_thread_mutex_lock( &connections_mutex );
 892         for( *index = 0; *index < dtblsize; (*index)++) {
 893                 if( connections[*index].c_struct_state != SLAP_C_UNINITIALIZED ) {
 894                         break;
 895                 }
 896         }
 897         ldap_pvt_thread_mutex_unlock( &connections_mutex );
 898
 899         return connection_next(NULL, index);
 900 }
 901
 902 Connection* connection_next( Connection *c, ber_socket_t *index )
 903 {
 904         assert( connections != NULL );
 905         assert( index != NULL );
 906         assert( *index <= dtblsize );
 907
 908         if( c != NULL ) ldap_pvt_thread_mutex_unlock( &c->c_mutex );
 909
 910         c = NULL;
 911
 912         ldap_pvt_thread_mutex_lock( &connections_mutex );
 913         for(; *index < dtblsize; (*index)++) {
 914                 if( connections[*index].c_struct_state == SLAP_C_UNINITIALIZED ) {
 915                         assert( connections[*index].c_conn_state == SLAP_C_INVALID );
 916                         break;
 917                 }
 918
 919                 if( connections[*index].c_struct_state == SLAP_C_USED ) {
 920                         assert( connections[*index].c_conn_state != SLAP_C_INVALID );
 921                         c = &connections[(*index)++];
 922                         break;
 923                 }
 924
 925                 assert( connections[*index].c_struct_state == SLAP_C_UNUSED );
 926                 assert( connections[*index].c_conn_state == SLAP_C_INVALID );
 927         }
 928
 929         if( c != NULL ) ldap_pvt_thread_mutex_lock( &c->c_mutex );
 930         ldap_pvt_thread_mutex_unlock( &connections_mutex );
 931         return c;
 932 }
 933
 934 void connection_done( Connection *c )
 935 {
 936         assert( connections != NULL );
 937
 938         if( c != NULL ) ldap_pvt_thread_mutex_unlock( &c->c_mutex );
 939 }
 940
 941 /*
 942  * connection_activity - handle the request operation op on connection
 943  * conn.  This routine figures out what kind of operation it is and
 944  * calls the appropriate stub to handle it.
 945  */
 946
 947 #ifdef SLAPD_MONITOR
 948 /* FIXME: returns 0 in case of failure */
 949 #define INCR_OP_INITIATED(index) \
 950         do { \
 951                 ldap_pvt_thread_mutex_lock( &slap_counters.sc_ops_mutex ); \
 952                 ldap_pvt_mp_add_ulong(slap_counters.sc_ops_initiated_[(index)], 1); \
 953                 ldap_pvt_thread_mutex_unlock( &slap_counters.sc_ops_mutex ); \
 954         } while (0)
 955 #define INCR_OP_COMPLETED(index) \
 956         do { \
 957                 ldap_pvt_thread_mutex_lock( &slap_counters.sc_ops_mutex ); \
 958                 ldap_pvt_mp_add_ulong(slap_counters.sc_ops_completed, 1); \
 959                 ldap_pvt_mp_add_ulong(slap_counters.sc_ops_completed_[(index)], 1); \
 960                 ldap_pvt_thread_mutex_unlock( &slap_counters.sc_ops_mutex ); \
 961         } while (0)
 962 #else /* !SLAPD_MONITOR */
 963 #define INCR_OP_INITIATED(index) do { } while (0)
 964 #define INCR_OP_COMPLETED(index) \
 965         do { \
 966                 ldap_pvt_thread_mutex_lock( &slap_counters.sc_ops_mutex ); \
 967                 ldap_pvt_mp_add_ulong(slap_counters.sc_ops_completed, 1); \
 968                 ldap_pvt_thread_mutex_unlock( &slap_counters.sc_ops_mutex ); \
 969         } while (0)
 970 #endif /* !SLAPD_MONITOR */
 971
 972 /*
 973  * NOTE: keep in sync with enum in slapd.h
 974  */
 975 static int (*opfun[])( Operation *op, SlapReply *rs ) = {
 976         do_bind,
 977         do_unbind,
 978         do_add,
 979         do_delete,
 980         do_modrdn,
 981         do_modify,
 982         do_compare,
 983         do_search,
 984         do_abandon,
 985         do_extended,
 986         NULL
 987 };
 988
 989 static void *
 990 connection_operation( void *ctx, void *arg_v )
 991 {
 992         int rc = LDAP_OTHER;
 993         Operation *op = arg_v;
 994         SlapReply rs = {REP_RESULT};
 995         ber_tag_t tag = op->o_tag;
 996         int opidx = -1;
 997         Connection *conn = op->o_conn;
 998         void *memctx = NULL;
 999         void *memctx_null = NULL;
1000         ber_len_t memsiz;
1001
1002         ldap_pvt_thread_mutex_lock( &slap_counters.sc_ops_mutex );
1003         /* FIXME: returns 0 in case of failure */
1004         ldap_pvt_mp_add_ulong(slap_counters.sc_ops_initiated, 1);
1005         ldap_pvt_thread_mutex_unlock( &slap_counters.sc_ops_mutex );
1006
1007         op->o_threadctx = ctx;
1008         op->o_tid = ldap_pvt_thread_pool_tid( ctx );
1009
1010         switch ( tag ) {
1011         case LDAP_REQ_BIND:
1012         case LDAP_REQ_UNBIND:
1013         case LDAP_REQ_ADD:
1014         case LDAP_REQ_DELETE:
1015         case LDAP_REQ_MODDN:
1016         case LDAP_REQ_MODIFY:
1017         case LDAP_REQ_COMPARE:
1018         case LDAP_REQ_SEARCH:
1019         case LDAP_REQ_ABANDON:
1020         case LDAP_REQ_EXTENDED:
1021                 break;
1022         default:
1023                 Debug( LDAP_DEBUG_ANY, "connection_operation: "
1024                         "conn %lu unknown LDAP request 0x%lx\n",
1025                         conn->c_connid, tag, 0 );
1026                 op->o_tag = LBER_ERROR;
1027                 rs.sr_err = LDAP_PROTOCOL_ERROR;
1028                 rs.sr_text = "unknown LDAP request";
1029                 send_ldap_disconnect( op, &rs );
1030                 rc = SLAPD_DISCONNECT;
1031                 goto operations_error;
1032         }
1033
1034         if( conn->c_sasl_bind_in_progress && tag != LDAP_REQ_BIND ) {
1035                 Debug( LDAP_DEBUG_ANY, "connection_operation: "
1036                         "error: SASL bind in progress (tag=%ld).\n",
1037                         (long) tag, 0, 0 );
1038                 send_ldap_error( op, &rs, LDAP_OPERATIONS_ERROR,
1039                         "SASL bind in progress" );
1040                 rc = LDAP_OPERATIONS_ERROR;
1041                 goto operations_error;
1042         }
1043
1044 #ifdef LDAP_X_TXN
1045         if (( conn->c_txn == CONN_TXN_SPECIFY ) && (
1046                 ( tag == LDAP_REQ_ADD ) ||
1047                 ( tag == LDAP_REQ_DELETE ) ||
1048                 ( tag == LDAP_REQ_MODIFY ) ||
1049                 ( tag == LDAP_REQ_MODRDN )))
1050         {
1051                 /* Disable SLAB allocator for all update operations
1052                         issued inside of a transaction */
1053                 op->o_tmpmemctx = NULL;
1054                 op->o_tmpmfuncs = &ch_mfuncs;
1055         } else
1056 #endif
1057         {
1058         /* We can use Thread-Local storage for most mallocs. We can
1059          * also use TL for ber parsing, but not on Add or Modify.
1060          */
1061 #if 0
1062         memsiz = ber_len( op->o_ber ) * 64;
1063         if ( SLAP_SLAB_SIZE > memsiz ) memsiz = SLAP_SLAB_SIZE;
1064 #endif
1065         memsiz = SLAP_SLAB_SIZE;
1066
1067         memctx = slap_sl_mem_create( memsiz, SLAP_SLAB_STACK, ctx );
1068         op->o_tmpmemctx = memctx;
1069         op->o_tmpmfuncs = &slap_sl_mfuncs;
1070         if ( tag != LDAP_REQ_ADD && tag != LDAP_REQ_MODIFY ) {
1071                 /* Note - the ber and its buffer are already allocated from
1072                  * regular memory; this only affects subsequent mallocs that
1073                  * ber_scanf may invoke.
1074                  */
1075                 ber_set_option( op->o_ber, LBER_OPT_BER_MEMCTX, &memctx );
1076         }
1077         }
1078
1079         switch ( tag ) {
1080         case LDAP_REQ_BIND:
1081                 opidx = SLAP_OP_BIND;
1082                 break;
1083
1084         case LDAP_REQ_UNBIND:
1085                 opidx = SLAP_OP_UNBIND;
1086                 break;
1087
1088         case LDAP_REQ_ADD:
1089                 opidx = SLAP_OP_ADD;
1090                 break;
1091
1092         case LDAP_REQ_DELETE:
1093                 opidx = SLAP_OP_DELETE;
1094                 break;
1095
1096         case LDAP_REQ_MODRDN:
1097                 opidx = SLAP_OP_MODRDN;
1098                 break;
1099
1100         case LDAP_REQ_MODIFY:
1101                 opidx = SLAP_OP_MODIFY;
1102                 break;
1103
1104         case LDAP_REQ_COMPARE:
1105                 opidx = SLAP_OP_COMPARE;
1106                 break;
1107
1108         case LDAP_REQ_SEARCH:
1109                 opidx = SLAP_OP_SEARCH;
1110                 break;
1111
1112         case LDAP_REQ_ABANDON:
1113                 opidx = SLAP_OP_ABANDON;
1114                 break;
1115
1116         case LDAP_REQ_EXTENDED:
1117                 opidx = SLAP_OP_EXTENDED;
1118                 break;
1119
1120         default:
1121                 /* not reachable */
1122                 assert( 0 );
1123         }
1124
1125         assert( opidx > -1 );
1126         INCR_OP_INITIATED( opidx );
1127         rc = (*(opfun[opidx]))( op, &rs );
1128
1129 operations_error:
1130         if ( rc == SLAPD_DISCONNECT ) {
1131                 tag = LBER_ERROR;
1132
1133         } else if ( opidx > -1 ) {
1134                 /* increment completed operations count
1135                  * only if operation was initiated
1136                  * and rc != SLAPD_DISCONNECT */
1137                 INCR_OP_COMPLETED( opidx );
1138         }
1139
1140         if ( op->o_cancel == SLAP_CANCEL_REQ ) {
1141                 if ( rc == SLAPD_ABANDON ) {
1142                         op->o_cancel = SLAP_CANCEL_ACK;
1143                 } else {
1144                         op->o_cancel = LDAP_TOO_LATE;
1145                 }
1146         }
1147         while ( op->o_cancel != SLAP_CANCEL_NONE &&
1148                 op->o_cancel != SLAP_CANCEL_DONE )
1149         {
1150                 ldap_pvt_thread_yield();
1151         }
1152
1153         ldap_pvt_thread_mutex_lock( &conn->c_mutex );
1154
1155         ber_set_option( op->o_ber, LBER_OPT_BER_MEMCTX, &memctx_null );
1156
1157         LDAP_STAILQ_REMOVE( &conn->c_ops, op, slap_op, o_next);
1158         LDAP_STAILQ_NEXT(op, o_next) = NULL;
1159         slap_op_free( op );
1160         conn->c_n_ops_executing--;
1161         conn->c_n_ops_completed++;
1162
1163         switch( tag ) {
1164         case LBER_ERROR:
1165         case LDAP_REQ_UNBIND:
1166                 /* c_mutex is locked */
1167                 connection_closing( conn,
1168                         tag == LDAP_REQ_UNBIND ? NULL : "operations error" );
1169                 break;
1170         }
1171
1172         connection_resched( conn );
1173         ldap_pvt_thread_mutex_unlock( &conn->c_mutex );
1174         return NULL;
1175 }
1176
1177 static const Listener dummy_list = { BER_BVC(""), BER_BVC("") };
1178
1179 int connection_client_setup(
1180         ber_socket_t s,
1181         ldap_pvt_thread_start_t *func,
1182         void *arg )
1183 {
1184         int rc;
1185         Connection *c;
1186
1187         rc = connection_init( s, (Listener *)&dummy_list, "", "",
1188                 CONN_IS_CLIENT, 0, NULL );
1189         if ( rc < 0 ) return -1;
1190
1191         c = connection_get( s );
1192         c->c_clientfunc = func;
1193         c->c_clientarg = arg;
1194
1195         slapd_add_internal( s, 0 );
1196         slapd_set_read( s, 1 );
1197         connection_return( c );
1198         return 0;
1199 }
1200
1201 void connection_client_enable(
1202         ber_socket_t s )
1203 {
1204         slapd_set_read( s, 1 );
1205 }
1206
1207 void connection_client_stop(
1208         ber_socket_t s )
1209 {
1210         Connection *c;
1211
1212         /* get (locked) connection */
1213         c = connection_get( s );
1214
1215         assert( c->c_conn_state == SLAP_C_CLIENT );
1216
1217         c->c_listener = NULL;
1218         c->c_conn_state = SLAP_C_INVALID;
1219         c->c_struct_state = SLAP_C_UNUSED;
1220         c->c_close_reason = "?";                        /* should never be needed */
1221         slapd_sd_lock();
1222         ber_sockbuf_free( c->c_sb );
1223         slapd_remove( s, 0, 1, 1 );
1224         c->c_sb = ber_sockbuf_alloc( );
1225         {
1226                 ber_len_t max = sockbuf_max_incoming;
1227                 ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_SET_MAX_INCOMING, &max );
1228         }
1229
1230         connection_return( c );
1231 }
1232
1233 #ifdef SLAP_LIGHTWEIGHT_DISPATCHER
1234
1235 static int connection_read( ber_socket_t s, conn_readinfo *cri );
1236
1237 static void* connection_read_thread( void* ctx, void* argv )
1238 {
1239         int rc ;
1240         conn_readinfo cri = { NULL, NULL, NULL, 0 };
1241         ber_socket_t s = (long)argv;
1242
1243         /*
1244          * read incoming LDAP requests. If there is more than one,
1245          * the first one is returned with new_op
1246          */
1247         if( ( rc = connection_read( s, &cri ) ) < 0 ) {
1248                 Debug( LDAP_DEBUG_CONNS, "connection_read(%d) error\n", s, 0, 0 );
1249                 return (void*)(long)rc;
1250         }
1251
1252         /* execute a single queued request in the same thread */
1253         if( cri.op && !cri.nullop ) {
1254                 rc = (long)connection_operation( ctx, cri.op );
1255         } else if ( cri.func ) {
1256                 rc = (long)cri.func( ctx, cri.arg );
1257         }
1258
1259         return (void*)(long)rc;
1260 }
1261
1262 int connection_read_activate( ber_socket_t s )
1263 {
1264         int rc;
1265
1266         /*
1267          * suspend reading on this file descriptor until a connection processing
1268          * thread reads data on it. Otherwise the listener thread will repeatedly
1269          * submit the same event on it to the pool.
1270          */
1271         rc = slapd_clr_read( s, 0 );
1272         if ( rc )
1273                 return rc;
1274
1275         rc = ldap_pvt_thread_pool_submit( &connection_pool,
1276                 connection_read_thread, (void *)(long)s );
1277
1278         if( rc != 0 ) {
1279                 Debug( LDAP_DEBUG_ANY,
1280                         "connection_read_activate(%d): submit failed (%d)\n",
1281                         s, rc, 0 );
1282         }
1283
1284         return rc;
1285 }
1286 #endif
1287
1288 #ifdef SLAP_LIGHTWEIGHT_DISPATCHER
1289 static int
1290 connection_read( ber_socket_t s, conn_readinfo *cri )
1291 #else
1292 int connection_read(ber_socket_t s)
1293 #endif
1294 {
1295         int rc = 0;
1296         Connection *c;
1297
1298         assert( connections != NULL );
1299
1300         /* get (locked) connection */
1301         c = connection_get( s );
1302
1303         if( c == NULL ) {
1304                 Debug( LDAP_DEBUG_ANY,
1305                         "connection_read(%ld): no connection!\n",
1306                         (long) s, 0, 0 );
1307
1308                 return -1;
1309         }
1310
1311         c->c_n_read++;
1312
1313         if( c->c_conn_state == SLAP_C_CLOSING ) {
1314                 Debug( LDAP_DEBUG_TRACE,
1315                         "connection_read(%d): closing, ignoring input for id=%lu\n",
1316                         s, c->c_connid, 0 );
1317                 connection_return( c );
1318                 return 0;
1319         }
1320
1321         if ( c->c_conn_state == SLAP_C_CLIENT ) {
1322 #ifdef SLAP_LIGHTWEIGHT_DISPATCHER
1323                 cri->func = c->c_clientfunc;
1324                 cri->arg = c->c_clientarg;
1325                 /* read should already be cleared */
1326 #else
1327                 slapd_clr_read( s, 0 );
1328                 ldap_pvt_thread_pool_submit( &connection_pool,
1329                         c->c_clientfunc, c->c_clientarg );
1330 #endif
1331                 connection_return( c );
1332                 return 0;
1333         }
1334
1335         Debug( LDAP_DEBUG_TRACE,
1336                 "connection_read(%d): checking for input on id=%lu\n",
1337                 s, c->c_connid, 0 );
1338
1339 #ifdef HAVE_TLS
1340         if ( c->c_is_tls && c->c_needs_tls_accept ) {
1341                 rc = ldap_pvt_tls_accept( c->c_sb, slap_tls_ctx );
1342                 if ( rc < 0 ) {
1343                         Debug( LDAP_DEBUG_TRACE,
1344                                 "connection_read(%d): TLS accept failure "
1345                                 "error=%d id=%lu, closing\n",
1346                                 s, rc, c->c_connid );
1347
1348                         c->c_needs_tls_accept = 0;
1349                         /* c_mutex is locked */
1350                         connection_closing( c, "TLS negotiation failure" );
1351                         connection_close( c );
1352                         connection_return( c );
1353                         return 0;
1354
1355                 } else if ( rc == 0 ) {
1356                         void *ssl;
1357                         struct berval authid = BER_BVNULL;
1358
1359                         c->c_needs_tls_accept = 0;
1360
1361                         /* we need to let SASL know */
1362                         ssl = ldap_pvt_tls_sb_ctx( c->c_sb );
1363
1364                         c->c_tls_ssf = (slap_ssf_t) ldap_pvt_tls_get_strength( ssl );
1365                         if( c->c_tls_ssf > c->c_ssf ) {
1366                                 c->c_ssf = c->c_tls_ssf;
1367                         }
1368
1369                         rc = dnX509peerNormalize( ssl, &authid );
1370                         if ( rc != LDAP_SUCCESS ) {
1371                                 Debug( LDAP_DEBUG_TRACE, "connection_read(%d): "
1372                                         "unable to get TLS client DN, error=%d id=%lu\n",
1373                                         s, rc, c->c_connid );
1374                         }
1375                         Statslog( LDAP_DEBUG_STATS,
1376                                 "conn=%lu fd=%d TLS established tls_ssf=%u ssf=%u\n",
1377                             c->c_connid, (int) s, c->c_tls_ssf, c->c_ssf, 0 );
1378                         slap_sasl_external( c, c->c_tls_ssf, &authid );
1379                         if ( authid.bv_val ) free( authid.bv_val );
1380                 }
1381
1382                 /* if success and data is ready, fall thru to data input loop */
1383                 if( !ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_DATA_READY, NULL ) )
1384                 {
1385 #ifdef SLAP_LIGHTWEIGHT_DISPATCHER
1386                         slapd_set_read( s, 1 );
1387 #endif
1388
1389                         connection_return( c );
1390                         return 0;
1391                 }
1392         }
1393 #endif
1394
1395 #ifdef HAVE_CYRUS_SASL
1396         if ( c->c_sasl_layers ) {
1397                 /* If previous layer is not removed yet, give up for now */
1398                 if ( !c->c_sasl_sockctx ) {
1399 #ifdef SLAP_LIGHTWEIGHT_DISPATCHER
1400                         slapd_set_read( s, 1 );
1401 #endif
1402
1403                         connection_return( c );
1404                         return 0;
1405                 }
1406
1407                 c->c_sasl_layers = 0;
1408
1409                 rc = ldap_pvt_sasl_install( c->c_sb, c->c_sasl_sockctx );
1410                 if( rc != LDAP_SUCCESS ) {
1411                         Debug( LDAP_DEBUG_TRACE,
1412                                 "connection_read(%d): SASL install error "
1413                                 "error=%d id=%lu, closing\n",
1414                                 s, rc, c->c_connid );
1415
1416                         /* c_mutex is locked */
1417                         connection_closing( c, "SASL layer install failure" );
1418                         connection_close( c );
1419                         connection_return( c );
1420                         return 0;
1421                 }
1422         }
1423 #endif
1424
1425 #define CONNECTION_INPUT_LOOP 1
1426 /* #define      DATA_READY_LOOP 1 */
1427
1428         do {
1429                 /* How do we do this without getting into a busy loop ? */
1430 #ifdef SLAP_LIGHTWEIGHT_DISPATCHER
1431                 rc = connection_input( c, cri );
1432 #else
1433                 rc = connection_input( c );
1434 #endif
1435         }
1436 #ifdef DATA_READY_LOOP
1437         while( !rc && ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_DATA_READY, NULL ));
1438 #elif CONNECTION_INPUT_LOOP
1439         while(!rc);
1440 #else
1441         while(0);
1442 #endif
1443
1444         if( rc < 0 ) {
1445                 Debug( LDAP_DEBUG_CONNS,
1446                         "connection_read(%d): input error=%d id=%lu, closing.\n",
1447                         s, rc, c->c_connid );
1448
1449                 /* c_mutex is locked */
1450                 connection_closing( c, conn_lost_str );
1451                 connection_close( c );
1452                 connection_return( c );
1453                 return 0;
1454         }
1455
1456 #ifdef SLAP_LIGHTWEIGHT_DISPATCHER
1457         if ( ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_NEEDS_WRITE, NULL ) ) {
1458                 slapd_set_write( s, 0 );
1459         }
1460
1461         slapd_set_read( s, 1 );
1462 #else
1463         if ( ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_NEEDS_READ, NULL ) ) {
1464                 slapd_set_read( s, 1 );
1465         }
1466
1467         if ( ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_NEEDS_WRITE, NULL ) ) {
1468                 slapd_set_write( s, 1 );
1469         }
1470 #endif
1471
1472         connection_return( c );
1473
1474         return 0;
1475 }
1476
1477 static int
1478 #ifdef SLAP_LIGHTWEIGHT_DISPATCHER
1479 connection_input( Connection *conn , conn_readinfo *cri )
1480 #else
1481 connection_input( Connection *conn )
1482 #endif
1483 {
1484         Operation *op;
1485         ber_tag_t       tag;
1486         ber_len_t       len;
1487         ber_int_t       msgid;
1488         BerElement      *ber;
1489         int             rc;
1490 #ifdef LDAP_CONNECTIONLESS
1491         Sockaddr        peeraddr;
1492         char            *cdn = NULL;
1493 #endif
1494         char *defer = NULL;
1495
1496         if ( conn->c_currentber == NULL &&
1497                 ( conn->c_currentber = ber_alloc()) == NULL )
1498         {
1499                 Debug( LDAP_DEBUG_ANY, "ber_alloc failed\n", 0, 0, 0 );
1500                 return -1;
1501         }
1502
1503         errno = 0;
1504
1505 #ifdef LDAP_CONNECTIONLESS
1506         if ( conn->c_is_udp ) {
1507                 char peername[sizeof("IP=255.255.255.255:65336")];
1508
1509                 len = ber_int_sb_read(conn->c_sb, &peeraddr, sizeof(struct sockaddr));
1510                 if (len != sizeof(struct sockaddr)) return 1;
1511
1512                 sprintf( peername, "IP=%s:%d",
1513                         inet_ntoa( peeraddr.sa_in_addr.sin_addr ),
1514                         (unsigned) ntohs( peeraddr.sa_in_addr.sin_port ) );
1515                 Statslog( LDAP_DEBUG_STATS,
1516                         "conn=%lu UDP request from %s (%s) accepted.\n",
1517                         conn->c_connid, peername, conn->c_sock_name.bv_val, 0, 0 );
1518         }
1519 #endif
1520
1521         tag = ber_get_next( conn->c_sb, &len, conn->c_currentber );
1522         if ( tag != LDAP_TAG_MESSAGE ) {
1523                 int err = errno;
1524                 ber_socket_t    sd;
1525
1526                 ber_sockbuf_ctrl( conn->c_sb, LBER_SB_OPT_GET_FD, &sd );
1527
1528                 Debug( LDAP_DEBUG_TRACE,
1529                         "ber_get_next on fd %d failed errno=%d (%s)\n",
1530                         sd, err, sock_errstr(err) );
1531                 if ( err != EWOULDBLOCK && err != EAGAIN ) {
1532                         /* log, close and send error */
1533                         ber_free( conn->c_currentber, 1 );
1534                         conn->c_currentber = NULL;
1535
1536                         return -2;
1537                 }
1538                 return 1;
1539         }
1540
1541         ber = conn->c_currentber;
1542         conn->c_currentber = NULL;
1543
1544         if ( (tag = ber_get_int( ber, &msgid )) != LDAP_TAG_MSGID ) {
1545                 /* log, close and send error */
1546                 Debug( LDAP_DEBUG_ANY, "ber_get_int returns 0x%lx\n", tag, 0, 0 );
1547                 ber_free( ber, 1 );
1548                 return -1;
1549         }
1550
1551         if ( (tag = ber_peek_tag( ber, &len )) == LBER_ERROR ) {
1552                 /* log, close and send error */
1553                 Debug( LDAP_DEBUG_ANY, "ber_peek_tag returns 0x%lx\n", tag, 0, 0 );
1554                 ber_free( ber, 1 );
1555
1556                 return -1;
1557         }
1558
1559 #ifdef LDAP_CONNECTIONLESS
1560         if( conn->c_is_udp ) {
1561                 if( tag == LBER_OCTETSTRING ) {
1562                         ber_get_stringa( ber, &cdn );
1563                         tag = ber_peek_tag(ber, &len);
1564                 }
1565                 if( tag != LDAP_REQ_ABANDON && tag != LDAP_REQ_SEARCH ) {
1566                         Debug( LDAP_DEBUG_ANY, "invalid req for UDP 0x%lx\n", tag, 0, 0 );
1567                         ber_free( ber, 1 );
1568                         return 0;
1569                 }
1570         }
1571 #endif
1572
1573         if(tag == LDAP_REQ_BIND) {
1574                 /* immediately abandon all existing operations upon BIND */
1575                 connection_abandon( conn );
1576         }
1577
1578         op = slap_op_alloc( ber, msgid, tag, conn->c_n_ops_received++ );
1579
1580         op->o_conn = conn;
1581         /* clear state if the connection is being reused from inactive */
1582         if ( conn->c_conn_state == SLAP_C_INACTIVE ) {
1583                 memset( &conn->c_pagedresults_state, 0,
1584                         sizeof( conn->c_pagedresults_state ) );
1585         }
1586
1587         op->o_res_ber = NULL;
1588
1589 #ifdef LDAP_CONNECTIONLESS
1590         if (conn->c_is_udp) {
1591                 if ( cdn ) {
1592                         ber_str2bv( cdn, 0, 1, &op->o_dn );
1593                         op->o_protocol = LDAP_VERSION2;
1594                 }
1595                 op->o_res_ber = ber_alloc_t( LBER_USE_DER );
1596                 if (op->o_res_ber == NULL) return 1;
1597
1598                 rc = ber_write( op->o_res_ber, (char *)&peeraddr,
1599                         sizeof(struct sockaddr), 0 );
1600
1601                 if (rc != sizeof(struct sockaddr)) {
1602                         Debug( LDAP_DEBUG_ANY, "ber_write failed\n", 0, 0, 0 );
1603                         return 1;
1604                 }
1605
1606                 if (op->o_protocol == LDAP_VERSION2) {
1607                         rc = ber_printf(op->o_res_ber, "{is{" /*}}*/, op->o_msgid, "");
1608                         if (rc == -1) {
1609                                 Debug( LDAP_DEBUG_ANY, "ber_write failed\n", 0, 0, 0 );
1610                                 return rc;
1611                         }
1612                 }
1613         }
1614 #endif /* LDAP_CONNECTIONLESS */
1615
1616         rc = 0;
1617
1618         /* Don't process requests when the conn is in the middle of a
1619          * Bind, or if it's closing. Also, don't let any single conn
1620          * use up all the available threads, and don't execute if we're
1621          * currently blocked on output. And don't execute if there are
1622          * already pending ops, let them go first.  Abandon operations
1623          * get exceptions to some, but not all, cases.
1624          */
1625         switch( tag ){
1626         default:
1627                 /* Abandon and Unbind are exempt from these checks */
1628                 if (conn->c_conn_state == SLAP_C_CLOSING) {
1629                         defer = "closing";
1630                         break;
1631                 } else if (conn->c_writewaiter) {
1632                         defer = "awaiting write";
1633                         break;
1634                 } else if (conn->c_n_ops_pending) {
1635                         defer = "pending operations";
1636                         break;
1637                 }
1638                 /* FALLTHRU */
1639         case LDAP_REQ_ABANDON:
1640                 /* Unbind is exempt from these checks */
1641                 if (conn->c_n_ops_executing >= connection_pool_max/2) {
1642                         defer = "too many executing";
1643                         break;
1644                 } else if (conn->c_conn_state == SLAP_C_BINDING) {
1645                         defer = "binding";
1646                         break;
1647                 }
1648                 /* FALLTHRU */
1649         case LDAP_REQ_UNBIND:
1650                 break;
1651         }
1652
1653         if( defer ) {
1654                 int max = conn->c_dn.bv_len
1655                         ? slap_conn_max_pending_auth
1656                         : slap_conn_max_pending;
1657
1658                 Debug( LDAP_DEBUG_ANY,
1659                         "connection_input: conn=%lu deferring operation: %s\n",
1660                         conn->c_connid, defer, 0 );
1661                 conn->c_n_ops_pending++;
1662                 LDAP_STAILQ_INSERT_TAIL( &conn->c_pending_ops, op, o_next );
1663                 rc = ( conn->c_n_ops_pending > max ) ? -1 : 0;
1664
1665         } else {
1666                 conn->c_n_ops_executing++;
1667
1668 #ifdef SLAP_LIGHTWEIGHT_DISPATCHER
1669                 /*
1670                  * The first op will be processed in the same thread context,
1671                  * as long as there is only one op total.
1672                  * Subsequent ops will be submitted to the pool by
1673                  * calling connection_op_activate()
1674                  */
1675                 if ( cri->op == NULL ) {
1676                         /* the first incoming request */
1677                         connection_op_queue( op );
1678                         cri->op = op;
1679                 } else {
1680                         if ( !cri->nullop ) {
1681                                 cri->nullop = 1;
1682                                 rc = ldap_pvt_thread_pool_submit( &connection_pool,
1683                                         connection_operation, (void *) cri->op );
1684                         }
1685                         connection_op_activate( op );
1686                 }
1687 #else
1688                 connection_op_activate( op );
1689 #endif
1690         }
1691
1692 #ifdef NO_THREADS
1693         if ( conn->c_struct_state != SLAP_C_USED ) {
1694                 /* connection must have got closed underneath us */
1695                 return 1;
1696         }
1697 #endif
1698
1699         assert( conn->c_struct_state == SLAP_C_USED );
1700         return rc;
1701 }
1702
1703 static int
1704 connection_resched( Connection *conn )
1705 {
1706         Operation *op;
1707
1708         if( conn->c_conn_state == SLAP_C_CLOSING ) {
1709                 ber_socket_t    sd;
1710                 ber_sockbuf_ctrl( conn->c_sb, LBER_SB_OPT_GET_FD, &sd );
1711
1712                 Debug( LDAP_DEBUG_TRACE, "connection_resched: "
1713                         "attempting closing conn=%lu sd=%d\n",
1714                         conn->c_connid, sd, 0 );
1715                 connection_close( conn );
1716                 return 0;
1717         }
1718
1719         if( conn->c_conn_state != SLAP_C_ACTIVE || conn->c_writewaiter ) {
1720                 /* other states need different handling */
1721                 return 0;
1722         }
1723
1724         while ((op = LDAP_STAILQ_FIRST( &conn->c_pending_ops )) != NULL) {
1725                 if ( conn->c_n_ops_executing > connection_pool_max/2 ) break;
1726
1727                 LDAP_STAILQ_REMOVE_HEAD( &conn->c_pending_ops, o_next );
1728                 LDAP_STAILQ_NEXT(op, o_next) = NULL;
1729
1730                 /* pending operations should not be marked for abandonment */
1731                 assert(!op->o_abandon);
1732
1733                 conn->c_n_ops_pending--;
1734                 conn->c_n_ops_executing++;
1735
1736                 connection_op_activate( op );
1737
1738                 if ( conn->c_conn_state == SLAP_C_BINDING ) break;
1739         }
1740         return 0;
1741 }
1742
1743 static void
1744 connection_init_log_prefix( Operation *op )
1745 {
1746         if ( op->o_connid == (unsigned long)(-1) ) {
1747                 snprintf( op->o_log_prefix, sizeof( op->o_log_prefix ),
1748                         "conn=-1 op=%lu", op->o_opid );
1749
1750         } else {
1751                 snprintf( op->o_log_prefix, sizeof( op->o_log_prefix ),
1752                         "conn=%lu op=%lu", op->o_connid, op->o_opid );
1753         }
1754 }
1755
1756 static int connection_bind_cleanup_cb( Operation *op, SlapReply *rs )
1757 {
1758         op->o_conn->c_sasl_bindop = NULL;
1759
1760         return SLAP_CB_CONTINUE;
1761 }
1762
1763 static int connection_bind_cb( Operation *op, SlapReply *rs )
1764 {
1765         ldap_pvt_thread_mutex_lock( &op->o_conn->c_mutex );
1766         op->o_conn->c_conn_state = SLAP_C_ACTIVE;
1767         op->o_conn->c_sasl_bind_in_progress =
1768                 ( rs->sr_err == LDAP_SASL_BIND_IN_PROGRESS );
1769
1770         /* Moved here from bind.c due to ITS#4158 */
1771         op->o_conn->c_sasl_bindop = NULL;
1772         if ( op->orb_method == LDAP_AUTH_SASL ) {
1773                 if( rs->sr_err == LDAP_SUCCESS ) {
1774                         ber_dupbv(&op->o_conn->c_dn, &op->orb_edn);
1775                         if( !BER_BVISEMPTY( &op->orb_edn ) ) {
1776                                 /* edn is always normalized already */
1777                                 ber_dupbv( &op->o_conn->c_ndn, &op->o_conn->c_dn );
1778                         }
1779                         op->o_tmpfree( op->orb_edn.bv_val, op->o_tmpmemctx );
1780                         BER_BVZERO( &op->orb_edn );
1781                         op->o_conn->c_authmech = op->o_conn->c_sasl_bind_mech;
1782                         BER_BVZERO( &op->o_conn->c_sasl_bind_mech );
1783
1784                         op->o_conn->c_sasl_ssf = op->orb_ssf;
1785                         if( op->orb_ssf > op->o_conn->c_ssf ) {
1786                                 op->o_conn->c_ssf = op->orb_ssf;
1787                         }
1788
1789                         if( !BER_BVISEMPTY( &op->o_conn->c_dn ) ) {
1790                                 ber_len_t max = sockbuf_max_incoming_auth;
1791                                 ber_sockbuf_ctrl( op->o_conn->c_sb,
1792                                         LBER_SB_OPT_SET_MAX_INCOMING, &max );
1793                         }
1794
1795                         /* log authorization identity */
1796                         Statslog( LDAP_DEBUG_STATS,
1797                                 "%s BIND dn=\"%s\" mech=%s ssf=%d\n",
1798                                 op->o_log_prefix,
1799                                 BER_BVISNULL( &op->o_conn->c_dn ) ? "<empty>" : op->o_conn->c_dn.bv_val,
1800                                 op->o_conn->c_authmech.bv_val, op->orb_ssf, 0 );
1801
1802                         Debug( LDAP_DEBUG_TRACE,
1803                                 "do_bind: SASL/%s bind: dn=\"%s\" ssf=%d\n",
1804                                 op->o_conn->c_authmech.bv_val,
1805                                 BER_BVISNULL( &op->o_conn->c_dn ) ? "<empty>" : op->o_conn->c_dn.bv_val,
1806                                 op->orb_ssf );
1807
1808                 } else if ( rs->sr_err != LDAP_SASL_BIND_IN_PROGRESS ) {
1809                         if ( !BER_BVISNULL( &op->o_conn->c_sasl_bind_mech ) ) {
1810                                 free( op->o_conn->c_sasl_bind_mech.bv_val );
1811                                 BER_BVZERO( &op->o_conn->c_sasl_bind_mech );
1812                         }
1813                 }
1814         }
1815         ldap_pvt_thread_mutex_unlock( &op->o_conn->c_mutex );
1816
1817         ch_free( op->o_callback );
1818         op->o_callback = NULL;
1819
1820         return SLAP_CB_CONTINUE;
1821 }
1822
1823 static void connection_op_queue( Operation *op )
1824 {
1825         ber_tag_t tag = op->o_tag;
1826
1827         if (tag == LDAP_REQ_BIND) {
1828                 slap_callback *sc = ch_calloc( 1, sizeof( slap_callback ));
1829                 sc->sc_response = connection_bind_cb;
1830                 sc->sc_cleanup = connection_bind_cleanup_cb;
1831                 sc->sc_next = op->o_callback;
1832                 op->o_callback = sc;
1833                 op->o_conn->c_conn_state = SLAP_C_BINDING;
1834         }
1835
1836         if (!op->o_dn.bv_len) {
1837                 op->o_authz = op->o_conn->c_authz;
1838                 if ( BER_BVISNULL( &op->o_conn->c_sasl_authz_dn )) {
1839                         ber_dupbv( &op->o_dn, &op->o_conn->c_dn );
1840                         ber_dupbv( &op->o_ndn, &op->o_conn->c_ndn );
1841                 } else {
1842                         ber_dupbv( &op->o_dn, &op->o_conn->c_sasl_authz_dn );
1843                         ber_dupbv( &op->o_ndn, &op->o_conn->c_sasl_authz_dn );
1844                 }
1845         }
1846
1847         op->o_authtype = op->o_conn->c_authtype;
1848         ber_dupbv( &op->o_authmech, &op->o_conn->c_authmech );
1849
1850         if (!op->o_protocol) {
1851                 op->o_protocol = op->o_conn->c_protocol
1852                         ? op->o_conn->c_protocol : LDAP_VERSION3;
1853         }
1854
1855         if (op->o_conn->c_conn_state == SLAP_C_INACTIVE &&
1856                 op->o_protocol > LDAP_VERSION2)
1857         {
1858                 op->o_conn->c_conn_state = SLAP_C_ACTIVE;
1859         }
1860
1861         op->o_connid = op->o_conn->c_connid;
1862         connection_init_log_prefix( op );
1863
1864         LDAP_STAILQ_INSERT_TAIL( &op->o_conn->c_ops, op, o_next );
1865 }
1866
1867 static int connection_op_activate( Operation *op )
1868 {
1869         int rc;
1870
1871         connection_op_queue( op );
1872
1873         rc = ldap_pvt_thread_pool_submit( &connection_pool,
1874                 connection_operation, (void *) op );
1875
1876         if ( rc != 0 ) {
1877                 Debug( LDAP_DEBUG_ANY,
1878                         "connection_op_activate: submit failed (%d) for conn=%lu\n",
1879                         rc, op->o_connid, 0 );
1880                 /* should move op to pending list */
1881         }
1882
1883         return rc;
1884 }
1885
1886 int connection_write(ber_socket_t s)
1887 {
1888         Connection *c;
1889         Operation *op;
1890
1891         assert( connections != NULL );
1892
1893         slapd_clr_write( s, 0 );
1894
1895         c = connection_get( s );
1896         if( c == NULL ) {
1897                 Debug( LDAP_DEBUG_ANY,
1898                         "connection_write(%ld): no connection!\n",
1899                         (long)s, 0, 0 );
1900                 return -1;
1901         }
1902
1903         c->c_n_write++;
1904
1905         Debug( LDAP_DEBUG_TRACE,
1906                 "connection_write(%d): waking output for id=%lu\n",
1907                 s, c->c_connid, 0 );
1908         ldap_pvt_thread_cond_signal( &c->c_write_cv );
1909
1910         if ( ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_NEEDS_READ, NULL ) ) {
1911                 slapd_set_read( s, 1 );
1912         }
1913         if ( ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_NEEDS_WRITE, NULL ) ) {
1914                 slapd_set_write( s, 1 );
1915         }
1916
1917         /* If there are ops pending because of a writewaiter,
1918          * start one up.
1919          */
1920         while ((op = LDAP_STAILQ_FIRST( &c->c_pending_ops )) != NULL) {
1921                 if ( !c->c_writewaiter ) break;
1922                 if ( c->c_n_ops_executing > connection_pool_max/2 ) break;
1923
1924                 LDAP_STAILQ_REMOVE_HEAD( &c->c_pending_ops, o_next );
1925                 LDAP_STAILQ_NEXT(op, o_next) = NULL;
1926
1927                 /* pending operations should not be marked for abandonment */
1928                 assert(!op->o_abandon);
1929
1930                 c->c_n_ops_pending--;
1931                 c->c_n_ops_executing++;
1932
1933                 connection_op_activate( op );
1934
1935                 break;
1936         }
1937
1938         connection_return( c );
1939         return 0;
1940 }
1941
1942 void
1943 connection_fake_init(
1944         Connection *conn,
1945         Operation *op,
1946         void *ctx )
1947 {
1948         conn->c_connid = -1;
1949         conn->c_send_ldap_result = slap_send_ldap_result;
1950         conn->c_send_search_entry = slap_send_search_entry;
1951         conn->c_send_search_reference = slap_send_search_reference;
1952         conn->c_listener = (Listener *)&dummy_list;
1953         conn->c_peer_domain = slap_empty_bv;
1954         conn->c_peer_name = slap_empty_bv;
1955
1956         memset(op, 0, OPERATION_BUFFER_SIZE);
1957         op->o_hdr = (Opheader *)(op+1);
1958         op->o_controls = (void **)(op->o_hdr+1);
1959         /* set memory context */
1960         op->o_tmpmemctx = slap_sl_mem_create(SLAP_SLAB_SIZE, SLAP_SLAB_STACK, ctx);
1961         op->o_tmpmfuncs = &slap_sl_mfuncs;
1962         op->o_threadctx = ctx;
1963         op->o_tid = ldap_pvt_thread_pool_tid( ctx );
1964
1965         op->o_conn = conn;
1966         op->o_connid = op->o_conn->c_connid;
1967         connection_init_log_prefix( op );
1968
1969 #ifdef LDAP_SLAPI
1970         slapi_int_create_object_extensions( SLAPI_X_EXT_CONNECTION, conn );
1971         slapi_int_create_object_extensions( SLAPI_X_EXT_OPERATION, op );
1972 #endif /* LDAP_SLAPI */
1973
1974         slap_op_time( &op->o_time, &op->o_tincr );
1975 }
1976
1977 void
1978 connection_assign_nextid( Connection *conn )
1979 {
1980         ldap_pvt_thread_mutex_lock( &conn_nextid_mutex );
1981         conn->c_connid = conn_nextid++;
1982         ldap_pvt_thread_mutex_unlock( &conn_nextid_mutex );
1983 }