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 1998-2007 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 typedef struct conn_readinfo {
  87         Operation *op;
  88         ldap_pvt_thread_start_t *func;
  89         void *arg;
  90         void *ctx;
  91         int nullop;
  92 } conn_readinfo;
  93
  94 static int connection_input( Connection *c, conn_readinfo *cri );
  95 static void connection_close( Connection *c );
  96
  97 static int connection_op_activate( Operation *op );
  98 static void connection_op_queue( Operation *op );
  99 static int connection_resched( Connection *conn );
 100 static void connection_abandon( Connection *conn );
 101 static void connection_destroy( Connection *c );
 102
 103 static ldap_pvt_thread_start_t connection_operation;
 104
 105 /*
 106  * Initialize connection management infrastructure.
 107  */
 108 int connections_init(void)
 109 {
 110         int i;
 111
 112         assert( connections == NULL );
 113
 114         if( connections != NULL) {
 115                 Debug( LDAP_DEBUG_ANY, "connections_init: already initialized.\n",
 116                         0, 0, 0 );
 117                 return -1;
 118         }
 119
 120         /* should check return of every call */
 121         ldap_pvt_thread_mutex_init( &connections_mutex );
 122         ldap_pvt_thread_mutex_init( &conn_nextid_mutex );
 123
 124         connections = (Connection *) ch_calloc( dtblsize, sizeof(Connection) );
 125
 126         if( connections == NULL ) {
 127                 Debug( LDAP_DEBUG_ANY, "connections_init: "
 128                         "allocation (%d*%ld) of connection array failed\n",
 129                         dtblsize, (long) sizeof(Connection), 0 );
 130                 return -1;
 131         }
 132
 133         assert( connections[0].c_struct_state == SLAP_C_UNINITIALIZED );
 134         assert( connections[dtblsize-1].c_struct_state == SLAP_C_UNINITIALIZED );
 135
 136         for (i=0; i<dtblsize; i++) connections[i].c_conn_idx = i;
 137
 138         /*
 139          * per entry initialization of the Connection array initialization
 140          * will be done by connection_init()
 141          */
 142
 143         return 0;
 144 }
 145
 146 /*
 147  * Destroy connection management infrastructure.
 148  */
 149
 150 int connections_destroy(void)
 151 {
 152         ber_socket_t i;
 153
 154         /* should check return of every call */
 155
 156         if( connections == NULL) {
 157                 Debug( LDAP_DEBUG_ANY, "connections_destroy: nothing to destroy.\n",
 158                         0, 0, 0 );
 159                 return -1;
 160         }
 161
 162         for ( i = 0; i < dtblsize; i++ ) {
 163                 if( connections[i].c_struct_state != SLAP_C_UNINITIALIZED ) {
 164                         ber_sockbuf_free( connections[i].c_sb );
 165                         ldap_pvt_thread_mutex_destroy( &connections[i].c_mutex );
 166                         ldap_pvt_thread_mutex_destroy( &connections[i].c_write_mutex );
 167                         ldap_pvt_thread_cond_destroy( &connections[i].c_write_cv );
 168 #ifdef LDAP_SLAPI
 169                         if ( slapi_plugins_used ) {
 170                                 slapi_int_free_object_extensions( SLAPI_X_EXT_CONNECTION,
 171                                         &connections[i] );
 172                         }
 173 #endif
 174                 }
 175         }
 176
 177         free( connections );
 178         connections = NULL;
 179
 180         ldap_pvt_thread_mutex_destroy( &connections_mutex );
 181         ldap_pvt_thread_mutex_destroy( &conn_nextid_mutex );
 182         return 0;
 183 }
 184
 185 /*
 186  * shutdown all connections
 187  */
 188 int connections_shutdown(void)
 189 {
 190         ber_socket_t i;
 191
 192         for ( i = 0; i < dtblsize; i++ ) {
 193                 if( connections[i].c_struct_state != SLAP_C_UNINITIALIZED ) {
 194                         ldap_pvt_thread_mutex_lock( &connections[i].c_mutex );
 195                         if( connections[i].c_struct_state == SLAP_C_USED ) {
 196
 197                                 /* give persistent clients a chance to cleanup */
 198                                 if( connections[i].c_conn_state == SLAP_C_CLIENT ) {
 199                                         ldap_pvt_thread_pool_submit( &connection_pool,
 200                                         connections[i].c_clientfunc, connections[i].c_clientarg );
 201                                 } else {
 202                                         /* c_mutex is locked */
 203                                         connection_closing( &connections[i], "slapd shutdown" );
 204                                         connection_close( &connections[i] );
 205                                 }
 206                         }
 207                         ldap_pvt_thread_mutex_unlock( &connections[i].c_mutex );
 208                 }
 209         }
 210
 211         return 0;
 212 }
 213
 214 /*
 215  * Timeout idle connections.
 216  */
 217 int connections_timeout_idle(time_t now)
 218 {
 219         int i = 0;
 220         int connindex;
 221         Connection* c;
 222
 223         for( c = connection_first( &connindex );
 224                 c != NULL;
 225                 c = connection_next( c, &connindex ) )
 226         {
 227                 /* Don't timeout a slow-running request or a persistent
 228                  * outbound connection */
 229                 if( c->c_n_ops_executing || c->c_conn_state == SLAP_C_CLIENT ) {
 230                         continue;
 231                 }
 232
 233                 if( difftime( c->c_activitytime+global_idletimeout, now) < 0 ) {
 234                         /* close it */
 235                         connection_closing( c, "idletimeout" );
 236                         connection_close( c );
 237                         i++;
 238                 }
 239         }
 240         connection_done( c );
 241
 242         return i;
 243 }
 244
 245 static Connection* connection_get( ber_socket_t s )
 246 {
 247         Connection *c;
 248
 249         Debug( LDAP_DEBUG_ARGS,
 250                 "connection_get(%ld)\n",
 251                 (long) s, 0, 0 );
 252
 253         assert( connections != NULL );
 254
 255         if(s == AC_SOCKET_INVALID) return NULL;
 256
 257 #ifndef HAVE_WINSOCK
 258         assert( s < dtblsize );
 259         c = &connections[s];
 260
 261 #else
 262         c = NULL;
 263         {
 264                 ldap_pvt_thread_mutex_lock( &connections_mutex );
 265                 for(i=0; i<dtblsize; i++) {
 266                         if( connections[i].c_struct_state == SLAP_C_PENDING )
 267                                 continue;
 268
 269                         if( connections[i].c_struct_state == SLAP_C_UNINITIALIZED ) {
 270                                 assert( connections[i].c_conn_state == SLAP_C_INVALID );
 271                                 assert( connections[i].c_sb == 0 );
 272                                 break;
 273                         }
 274
 275                         if( connections[i].c_struct_state == SLAP_C_UNUSED ) {
 276                                 assert( connections[i].c_conn_state == SLAP_C_INVALID );
 277                                 assert( connections[i].c_sd == AC_SOCKET_INVALID );
 278                                 continue;
 279                         }
 280
 281                         /* state can actually change from used -> unused by resched,
 282                          * so don't assert details here.
 283                          */
 284
 285                         if( connections[i].c_sd == s ) {
 286                                 c = &connections[i];
 287                                 break;
 288                         }
 289                 }
 290                 ldap_pvt_thread_mutex_unlock( &connections_mutex );
 291         }
 292 #endif
 293
 294         if( c != NULL ) {
 295                 ldap_pvt_thread_mutex_lock( &c->c_mutex );
 296
 297                 assert( c->c_struct_state != SLAP_C_UNINITIALIZED );
 298
 299 #ifdef HAVE_WINSOCK
 300                 /* Avoid race condition after releasing
 301                  * connections_mutex
 302                  */
 303                 if ( c->c_sd != s ) {
 304                         ldap_pvt_thread_mutex_unlock( &c->c_mutex );
 305                         return NULL;
 306                 }
 307 #endif
 308                 if( c->c_struct_state != SLAP_C_USED ) {
 309                         /* connection must have been closed due to resched */
 310
 311                         assert( c->c_conn_state == SLAP_C_INVALID );
 312                         assert( c->c_sd == AC_SOCKET_INVALID );
 313
 314                         Debug( LDAP_DEBUG_TRACE,
 315                                 "connection_get(%d): connection not used\n",
 316                                 s, 0, 0 );
 317
 318                         ldap_pvt_thread_mutex_unlock( &c->c_mutex );
 319                         return NULL;
 320                 }
 321
 322                 Debug( LDAP_DEBUG_TRACE,
 323                         "connection_get(%d): got connid=%lu\n",
 324                         s, c->c_connid, 0 );
 325
 326                 c->c_n_get++;
 327
 328                 assert( c->c_struct_state == SLAP_C_USED );
 329                 assert( c->c_conn_state != SLAP_C_INVALID );
 330                 assert( c->c_sd != AC_SOCKET_INVALID );
 331
 332 #ifndef SLAPD_MONITOR
 333                 if ( global_idletimeout > 0 )
 334 #endif /* ! SLAPD_MONITOR */
 335                 {
 336                         c->c_activitytime = slap_get_time();
 337                 }
 338         }
 339
 340         return c;
 341 }
 342
 343 static void connection_return( Connection *c )
 344 {
 345         ldap_pvt_thread_mutex_unlock( &c->c_mutex );
 346 }
 347
 348 Connection * connection_init(
 349         ber_socket_t s,
 350         Listener *listener,
 351         const char* dnsname,
 352         const char* peername,
 353         int flags,
 354         slap_ssf_t ssf,
 355         struct berval *authid
 356         LDAP_PF_LOCAL_SENDMSG_ARG(struct berval *peerbv))
 357 {
 358         unsigned long id;
 359         Connection *c;
 360         int doinit = 0;
 361
 362         assert( connections != NULL );
 363
 364         assert( listener != NULL );
 365         assert( dnsname != NULL );
 366         assert( peername != NULL );
 367
 368 #ifndef HAVE_TLS
 369         assert( !( flags & CONN_IS_TLS ));
 370 #endif
 371
 372         if( s == AC_SOCKET_INVALID ) {
 373                 Debug( LDAP_DEBUG_ANY,
 374                         "connection_init: init of socket %ld invalid.\n", (long)s, 0, 0 );
 375                 return NULL;
 376         }
 377
 378         assert( s >= 0 );
 379 #ifndef HAVE_WINSOCK
 380         assert( s < dtblsize );
 381         c = &connections[s];
 382         if( c->c_struct_state == SLAP_C_UNINITIALIZED ) {
 383                 doinit = 1;
 384         } else {
 385                 assert( c->c_struct_state == SLAP_C_UNUSED );
 386         }
 387 #else
 388         {
 389                 ber_socket_t i;
 390                 c = NULL;
 391
 392                 ldap_pvt_thread_mutex_lock( &connections_mutex );
 393                 for( i=0; i < dtblsize; i++) {
 394                         if ( connections[i].c_struct_state == SLAP_C_PENDING )
 395                                 continue;
 396
 397                         if( connections[i].c_struct_state == SLAP_C_UNINITIALIZED ) {
 398                                 assert( connections[i].c_sb == 0 );
 399                                 c = &connections[i];
 400                                 c->c_struct_state = SLAP_C_PENDING;
 401                                 doinit = 1;
 402                                 break;
 403                         }
 404
 405                         if( connections[i].c_struct_state == SLAP_C_UNUSED ) {
 406                                 c = &connections[i];
 407                                 c->c_struct_state = SLAP_C_PENDING;
 408                                 break;
 409                         }
 410
 411                         if( connections[i].c_conn_state == SLAP_C_CLIENT ) continue;
 412
 413                         assert( connections[i].c_struct_state == SLAP_C_USED );
 414                         assert( connections[i].c_conn_state != SLAP_C_INVALID );
 415                 }
 416                 ldap_pvt_thread_mutex_unlock( &connections_mutex );
 417
 418                 if( c == NULL ) {
 419                         Debug( LDAP_DEBUG_ANY,
 420                                 "connection_init(%d): connection table full "
 421                                 "(%d/%d)\n", s, i, dtblsize);
 422                         return NULL;
 423                 }
 424         }
 425 #endif
 426
 427         if( doinit ) {
 428                 c->c_send_ldap_result = slap_send_ldap_result;
 429                 c->c_send_search_entry = slap_send_search_entry;
 430                 c->c_send_search_reference = slap_send_search_reference;
 431                 c->c_send_ldap_extended = slap_send_ldap_extended;
 432                 c->c_send_ldap_intermediate = slap_send_ldap_intermediate;
 433
 434                 BER_BVZERO( &c->c_authmech );
 435                 BER_BVZERO( &c->c_dn );
 436                 BER_BVZERO( &c->c_ndn );
 437
 438                 c->c_listener = NULL;
 439                 BER_BVZERO( &c->c_peer_domain );
 440                 BER_BVZERO( &c->c_peer_name );
 441
 442                 LDAP_STAILQ_INIT(&c->c_ops);
 443                 LDAP_STAILQ_INIT(&c->c_pending_ops);
 444
 445 #ifdef LDAP_X_TXN
 446                 c->c_txn = CONN_TXN_INACTIVE;
 447                 c->c_txn_backend = NULL;
 448                 LDAP_STAILQ_INIT(&c->c_txn_ops);
 449 #endif
 450
 451                 BER_BVZERO( &c->c_sasl_bind_mech );
 452                 c->c_sasl_done = 0;
 453                 c->c_sasl_authctx = NULL;
 454                 c->c_sasl_sockctx = NULL;
 455                 c->c_sasl_extra = NULL;
 456                 c->c_sasl_bindop = NULL;
 457
 458                 c->c_sb = ber_sockbuf_alloc( );
 459
 460                 {
 461                         ber_len_t max = sockbuf_max_incoming;
 462                         ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_SET_MAX_INCOMING, &max );
 463                 }
 464
 465                 c->c_currentber = NULL;
 466
 467                 /* should check status of thread calls */
 468                 ldap_pvt_thread_mutex_init( &c->c_mutex );
 469                 ldap_pvt_thread_mutex_init( &c->c_write_mutex );
 470                 ldap_pvt_thread_cond_init( &c->c_write_cv );
 471
 472 #ifdef LDAP_SLAPI
 473                 if ( slapi_plugins_used ) {
 474                         slapi_int_create_object_extensions( SLAPI_X_EXT_CONNECTION, c );
 475                 }
 476 #endif
 477         }
 478
 479         ldap_pvt_thread_mutex_lock( &c->c_mutex );
 480
 481         assert( BER_BVISNULL( &c->c_authmech ) );
 482         assert( BER_BVISNULL( &c->c_dn ) );
 483         assert( BER_BVISNULL( &c->c_ndn ) );
 484         assert( c->c_listener == NULL );
 485         assert( BER_BVISNULL( &c->c_peer_domain ) );
 486         assert( BER_BVISNULL( &c->c_peer_name ) );
 487         assert( LDAP_STAILQ_EMPTY(&c->c_ops) );
 488         assert( LDAP_STAILQ_EMPTY(&c->c_pending_ops) );
 489 #ifdef LDAP_X_TXN
 490         assert( c->c_txn == CONN_TXN_INACTIVE );
 491         assert( c->c_txn_backend == NULL );
 492         assert( LDAP_STAILQ_EMPTY(&c->c_txn_ops) );
 493 #endif
 494         assert( BER_BVISNULL( &c->c_sasl_bind_mech ) );
 495         assert( c->c_sasl_done == 0 );
 496         assert( c->c_sasl_authctx == NULL );
 497         assert( c->c_sasl_sockctx == NULL );
 498         assert( c->c_sasl_extra == NULL );
 499         assert( c->c_sasl_bindop == NULL );
 500         assert( c->c_currentber == NULL );
 501         assert( c->c_writewaiter == 0);
 502
 503         c->c_listener = listener;
 504         c->c_sd = s;
 505
 506         if ( flags & CONN_IS_CLIENT ) {
 507                 c->c_connid = 0;
 508                 c->c_conn_state = SLAP_C_CLIENT;
 509                 c->c_struct_state = SLAP_C_USED;
 510                 c->c_close_reason = "?";                        /* should never be needed */
 511                 ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_SET_FD, &s );
 512                 ldap_pvt_thread_mutex_unlock( &c->c_mutex );
 513
 514                 return c;
 515         }
 516
 517         ber_str2bv( dnsname, 0, 1, &c->c_peer_domain );
 518         ber_str2bv( peername, 0, 1, &c->c_peer_name );
 519
 520         c->c_n_ops_received = 0;
 521         c->c_n_ops_executing = 0;
 522         c->c_n_ops_pending = 0;
 523         c->c_n_ops_completed = 0;
 524
 525         c->c_n_get = 0;
 526         c->c_n_read = 0;
 527         c->c_n_write = 0;
 528
 529         /* set to zero until bind, implies LDAP_VERSION3 */
 530         c->c_protocol = 0;
 531
 532 #ifndef SLAPD_MONITOR
 533         if ( global_idletimeout > 0 )
 534 #endif /* ! SLAPD_MONITOR */
 535         {
 536                 c->c_activitytime = c->c_starttime = slap_get_time();
 537         }
 538
 539 #ifdef LDAP_CONNECTIONLESS
 540         c->c_is_udp = 0;
 541         if( flags & CONN_IS_UDP ) {
 542                 c->c_is_udp = 1;
 543 #ifdef LDAP_DEBUG
 544                 ber_sockbuf_add_io( c->c_sb, &ber_sockbuf_io_debug,
 545                         LBER_SBIOD_LEVEL_PROVIDER, (void*)"udp_" );
 546 #endif
 547                 ber_sockbuf_add_io( c->c_sb, &ber_sockbuf_io_udp,
 548                         LBER_SBIOD_LEVEL_PROVIDER, (void *)&s );
 549                 ber_sockbuf_add_io( c->c_sb, &ber_sockbuf_io_readahead,
 550                         LBER_SBIOD_LEVEL_PROVIDER, NULL );
 551         } else
 552 #endif /* LDAP_CONNECTIONLESS */
 553 #ifdef LDAP_PF_LOCAL
 554         if ( flags & CONN_IS_IPC ) {
 555 #ifdef LDAP_DEBUG
 556                 ber_sockbuf_add_io( c->c_sb, &ber_sockbuf_io_debug,
 557                         LBER_SBIOD_LEVEL_PROVIDER, (void*)"ipc_" );
 558 #endif
 559                 ber_sockbuf_add_io( c->c_sb, &ber_sockbuf_io_fd,
 560                         LBER_SBIOD_LEVEL_PROVIDER, (void *)&s );
 561 #ifdef LDAP_PF_LOCAL_SENDMSG
 562                 if ( !BER_BVISEMPTY( peerbv ))
 563                         ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_UNGET_BUF, peerbv );
 564 #endif
 565         } else
 566 #endif /* LDAP_PF_LOCAL */
 567         {
 568 #ifdef LDAP_DEBUG
 569                 ber_sockbuf_add_io( c->c_sb, &ber_sockbuf_io_debug,
 570                         LBER_SBIOD_LEVEL_PROVIDER, (void*)"tcp_" );
 571 #endif
 572                 ber_sockbuf_add_io( c->c_sb, &ber_sockbuf_io_tcp,
 573                         LBER_SBIOD_LEVEL_PROVIDER, (void *)&s );
 574         }
 575
 576 #ifdef LDAP_DEBUG
 577         ber_sockbuf_add_io( c->c_sb, &ber_sockbuf_io_debug,
 578                 INT_MAX, (void*)"ldap_" );
 579 #endif
 580
 581         if( ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_SET_NONBLOCK,
 582                 c /* non-NULL */ ) < 0 )
 583         {
 584                 Debug( LDAP_DEBUG_ANY,
 585                         "connection_init(%d, %s): set nonblocking failed\n",
 586                         s, c->c_peer_name.bv_val, 0 );
 587         }
 588
 589         ldap_pvt_thread_mutex_lock( &conn_nextid_mutex );
 590         id = c->c_connid = conn_nextid++;
 591         ldap_pvt_thread_mutex_unlock( &conn_nextid_mutex );
 592
 593         c->c_conn_state = SLAP_C_INACTIVE;
 594         c->c_struct_state = SLAP_C_USED;
 595         c->c_close_reason = "?";                        /* should never be needed */
 596
 597         c->c_ssf = c->c_transport_ssf = ssf;
 598         c->c_tls_ssf = 0;
 599
 600 #ifdef HAVE_TLS
 601         if ( flags & CONN_IS_TLS ) {
 602                 c->c_is_tls = 1;
 603                 c->c_needs_tls_accept = 1;
 604         } else {
 605                 c->c_is_tls = 0;
 606                 c->c_needs_tls_accept = 0;
 607         }
 608 #endif
 609
 610         slap_sasl_open( c, 0 );
 611         slap_sasl_external( c, ssf, authid );
 612
 613         slapd_add_internal( s, 1 );
 614         ldap_pvt_thread_mutex_unlock( &c->c_mutex );
 615
 616         backend_connection_init(c);
 617
 618         return c;
 619 }
 620
 621 void connection2anonymous( Connection *c )
 622 {
 623         assert( connections != NULL );
 624         assert( c != NULL );
 625
 626         {
 627                 ber_len_t max = sockbuf_max_incoming;
 628                 ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_SET_MAX_INCOMING, &max );
 629         }
 630
 631         if ( !BER_BVISNULL( &c->c_authmech ) ) {
 632                 ch_free(c->c_authmech.bv_val);
 633         }
 634         BER_BVZERO( &c->c_authmech );
 635
 636         if ( !BER_BVISNULL( &c->c_dn ) ) {
 637                 ch_free(c->c_dn.bv_val);
 638         }
 639         BER_BVZERO( &c->c_dn );
 640
 641         if ( !BER_BVISNULL( &c->c_ndn ) ) {
 642                 ch_free(c->c_ndn.bv_val);
 643         }
 644         BER_BVZERO( &c->c_ndn );
 645
 646         if ( !BER_BVISNULL( &c->c_sasl_authz_dn ) ) {
 647                 ber_memfree_x( c->c_sasl_authz_dn.bv_val, NULL );
 648         }
 649         BER_BVZERO( &c->c_sasl_authz_dn );
 650
 651         c->c_authz_backend = NULL;
 652 }
 653
 654 static void
 655 connection_destroy( Connection *c )
 656 {
 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         /* c must be fully reset by this point; when we call slapd_remove
 734          * it may get immediately reused by a new connection.
 735          */
 736         if ( c->c_sd != AC_SOCKET_INVALID ) {
 737                 slapd_remove( c->c_sd, sb, 1, 0, 0 );
 738
 739                 if ( close_reason == NULL ) {
 740                         Statslog( LDAP_DEBUG_STATS, "conn=%lu fd=%ld closed\n",
 741                                 connid, (long) c->c_sd, 0, 0, 0 );
 742                 } else {
 743                         Statslog( LDAP_DEBUG_STATS, "conn=%lu fd=%ld closed (%s)\n",
 744                                 connid, (long) c->c_sd, close_reason, 0, 0 );
 745                 }
 746                 c->c_sd = AC_SOCKET_INVALID;
 747         }
 748 }
 749
 750 int connection_state_closing( Connection *c )
 751 {
 752         /* c_mutex must be locked by caller */
 753
 754         int state;
 755         assert( c != NULL );
 756         assert( c->c_struct_state == SLAP_C_USED );
 757
 758         state = c->c_conn_state;
 759
 760         assert( state != SLAP_C_INVALID );
 761
 762         return state == SLAP_C_CLOSING;
 763 }
 764
 765 static void connection_abandon( Connection *c )
 766 {
 767         /* c_mutex must be locked by caller */
 768
 769         Operation *o, *next, op = {0};
 770         Opheader ohdr = {0};
 771         SlapReply rs = {0};
 772
 773         op.o_hdr = &ohdr;
 774         op.o_conn = c;
 775         op.o_connid = c->c_connid;
 776         op.o_tag = LDAP_REQ_ABANDON;
 777
 778         for ( o = LDAP_STAILQ_FIRST( &c->c_ops ); o; o=next ) {
 779                 next = LDAP_STAILQ_NEXT( o, o_next );
 780                 op.orn_msgid = o->o_msgid;
 781                 o->o_abandon = 1;
 782                 op.o_bd = frontendDB;
 783                 frontendDB->be_abandon( &op, &rs );
 784         }
 785
 786 #ifdef LDAP_X_TXN
 787         /* remove operations in pending transaction */
 788         while ( (o = LDAP_STAILQ_FIRST( &c->c_txn_ops )) != NULL) {
 789                 LDAP_STAILQ_REMOVE_HEAD( &c->c_txn_ops, o_next );
 790                 LDAP_STAILQ_NEXT(o, o_next) = NULL;
 791                 slap_op_free( o, NULL );
 792         }
 793
 794         /* clear transaction */
 795         c->c_txn_backend = NULL;
 796         c->c_txn = CONN_TXN_INACTIVE;
 797 #endif
 798
 799         /* remove pending operations */
 800         while ( (o = LDAP_STAILQ_FIRST( &c->c_pending_ops )) != NULL) {
 801                 LDAP_STAILQ_REMOVE_HEAD( &c->c_pending_ops, o_next );
 802                 LDAP_STAILQ_NEXT(o, o_next) = NULL;
 803                 slap_op_free( o, NULL );
 804         }
 805 }
 806
 807 void connection_closing( Connection *c, const char *why )
 808 {
 809         assert( connections != NULL );
 810         assert( c != NULL );
 811         assert( c->c_struct_state == SLAP_C_USED );
 812         assert( c->c_conn_state != SLAP_C_INVALID );
 813
 814         /* c_mutex must be locked by caller */
 815
 816         if( c->c_conn_state != SLAP_C_CLOSING ) {
 817                 Debug( LDAP_DEBUG_TRACE,
 818                         "connection_closing: readying conn=%lu sd=%d for close\n",
 819                         c->c_connid, c->c_sd, 0 );
 820                 /* update state to closing */
 821                 c->c_conn_state = SLAP_C_CLOSING;
 822                 c->c_close_reason = why;
 823
 824                 /* don't listen on this port anymore */
 825                 slapd_clr_read( c->c_sd, 0 );
 826
 827                 /* abandon active operations */
 828                 connection_abandon( c );
 829
 830                 /* wake write blocked operations */
 831                 if ( c->c_writewaiter ) {
 832                         ldap_pvt_thread_cond_signal( &c->c_write_cv );
 833                         /* ITS#4667 this may allow another thread to drop into
 834                          * connection_resched / connection_close before we
 835                          * finish, but that's OK.
 836                          */
 837                         slapd_clr_write( c->c_sd, 1 );
 838                         ldap_pvt_thread_mutex_unlock( &c->c_mutex );
 839                         ldap_pvt_thread_mutex_lock( &c->c_write_mutex );
 840                         ldap_pvt_thread_mutex_lock( &c->c_mutex );
 841                         ldap_pvt_thread_mutex_unlock( &c->c_write_mutex );
 842                 } else {
 843                         slapd_clr_write( c->c_sd, 1 );
 844                 }
 845
 846         } else if( why == NULL && c->c_close_reason == conn_lost_str ) {
 847                 /* Client closed connection after doing Unbind. */
 848                 c->c_close_reason = NULL;
 849         }
 850 }
 851
 852 static void
 853 connection_close( Connection *c )
 854 {
 855         assert( connections != NULL );
 856         assert( c != NULL );
 857
 858         /* ITS#4667 we may have gotten here twice */
 859         if ( c->c_conn_state == SLAP_C_INVALID )
 860                 return;
 861
 862         assert( c->c_struct_state == SLAP_C_USED );
 863         assert( c->c_conn_state == SLAP_C_CLOSING );
 864
 865         /* NOTE: c_mutex should be locked by caller */
 866
 867         if ( !LDAP_STAILQ_EMPTY(&c->c_ops) ||
 868                 !LDAP_STAILQ_EMPTY(&c->c_pending_ops) )
 869         {
 870                 Debug( LDAP_DEBUG_TRACE,
 871                         "connection_close: deferring conn=%lu sd=%d\n",
 872                         c->c_connid, c->c_sd, 0 );
 873                 return;
 874         }
 875
 876         Debug( LDAP_DEBUG_TRACE, "connection_close: conn=%lu sd=%d\n",
 877                 c->c_connid, c->c_sd, 0 );
 878
 879         connection_destroy( c );
 880 }
 881
 882 unsigned long connections_nextid(void)
 883 {
 884         unsigned long id;
 885         assert( connections != NULL );
 886
 887         ldap_pvt_thread_mutex_lock( &conn_nextid_mutex );
 888
 889         id = conn_nextid;
 890
 891         ldap_pvt_thread_mutex_unlock( &conn_nextid_mutex );
 892
 893         return id;
 894 }
 895
 896 Connection* connection_first( ber_socket_t *index )
 897 {
 898         assert( connections != NULL );
 899         assert( index != NULL );
 900
 901         ldap_pvt_thread_mutex_lock( &connections_mutex );
 902         for( *index = 0; *index < dtblsize; (*index)++) {
 903                 if( connections[*index].c_struct_state != SLAP_C_UNINITIALIZED ) {
 904                         break;
 905                 }
 906         }
 907         ldap_pvt_thread_mutex_unlock( &connections_mutex );
 908
 909         return connection_next(NULL, index);
 910 }
 911
 912 Connection* connection_next( Connection *c, ber_socket_t *index )
 913 {
 914         assert( connections != NULL );
 915         assert( index != NULL );
 916         assert( *index <= dtblsize );
 917
 918         if( c != NULL ) ldap_pvt_thread_mutex_unlock( &c->c_mutex );
 919
 920         c = NULL;
 921
 922         ldap_pvt_thread_mutex_lock( &connections_mutex );
 923         for(; *index < dtblsize; (*index)++) {
 924                 int c_struct;
 925                 if( connections[*index].c_struct_state == SLAP_C_UNINITIALIZED ) {
 926                         assert( connections[*index].c_conn_state == SLAP_C_INVALID );
 927 #ifdef HAVE_WINSOCK
 928                         break;
 929 #else
 930                         continue;
 931 #endif
 932                 }
 933
 934                 if( connections[*index].c_struct_state == SLAP_C_USED ) {
 935                         assert( connections[*index].c_conn_state != SLAP_C_INVALID );
 936                         c = &connections[(*index)++];
 937                         if ( ldap_pvt_thread_mutex_trylock( &c->c_mutex )) {
 938                                 /* avoid deadlock */
 939                                 ldap_pvt_thread_mutex_unlock( &connections_mutex );
 940                                 ldap_pvt_thread_mutex_lock( &c->c_mutex );
 941                                 ldap_pvt_thread_mutex_lock( &connections_mutex );
 942                                 if ( c->c_struct_state != SLAP_C_USED ) {
 943                                         ldap_pvt_thread_mutex_unlock( &c->c_mutex );
 944                                         c = NULL;
 945                                         continue;
 946                                 }
 947                         }
 948                         break;
 949                 }
 950
 951                 c_struct = connections[*index].c_struct_state;
 952                 if ( c_struct == SLAP_C_PENDING )
 953                         continue;
 954                 assert( c_struct == SLAP_C_UNUSED );
 955                 assert( connections[*index].c_conn_state == SLAP_C_INVALID );
 956         }
 957
 958         ldap_pvt_thread_mutex_unlock( &connections_mutex );
 959         return c;
 960 }
 961
 962 void connection_done( Connection *c )
 963 {
 964         assert( connections != NULL );
 965
 966         if( c != NULL ) ldap_pvt_thread_mutex_unlock( &c->c_mutex );
 967 }
 968
 969 /*
 970  * connection_activity - handle the request operation op on connection
 971  * conn.  This routine figures out what kind of operation it is and
 972  * calls the appropriate stub to handle it.
 973  */
 974
 975 #ifdef SLAPD_MONITOR
 976 /* FIXME: returns 0 in case of failure */
 977 #define INCR_OP_INITIATED(index) \
 978         do { \
 979                 ldap_pvt_thread_mutex_lock( &op->o_counters->sc_mutex ); \
 980                 ldap_pvt_mp_add_ulong(op->o_counters->sc_ops_initiated_[(index)], 1); \
 981                 ldap_pvt_thread_mutex_unlock( &op->o_counters->sc_mutex ); \
 982         } while (0)
 983 #define INCR_OP_COMPLETED(index) \
 984         do { \
 985                 ldap_pvt_thread_mutex_lock( &op->o_counters->sc_mutex ); \
 986                 ldap_pvt_mp_add_ulong(op->o_counters->sc_ops_completed, 1); \
 987                 ldap_pvt_mp_add_ulong(op->o_counters->sc_ops_completed_[(index)], 1); \
 988                 ldap_pvt_thread_mutex_unlock( &op->o_counters->sc_mutex ); \
 989         } while (0)
 990 #else /* !SLAPD_MONITOR */
 991 #define INCR_OP_INITIATED(index) do { } while (0)
 992 #define INCR_OP_COMPLETED(index) \
 993         do { \
 994                 ldap_pvt_thread_mutex_lock( &op->o_counters->sc_mutex ); \
 995                 ldap_pvt_mp_add_ulong(op->o_counters->sc_ops_completed, 1); \
 996                 ldap_pvt_thread_mutex_unlock( &op->o_counters->sc_mutex ); \
 997         } while (0)
 998 #endif /* !SLAPD_MONITOR */
 999
1000 /*
1001  * NOTE: keep in sync with enum in slapd.h
1002  */
1003 static BI_op_func *opfun[] = {
1004         do_bind,
1005         do_unbind,
1006         do_search,
1007         do_compare,
1008         do_modify,
1009         do_modrdn,
1010         do_add,
1011         do_delete,
1012         do_abandon,
1013         do_extended,
1014         NULL
1015 };
1016
1017 /* Counters are per-thread, not per-connection.
1018  */
1019 static void
1020 conn_counter_destroy( void *key, void *data )
1021 {
1022         slap_counters_t **prev, *sc;
1023
1024         ldap_pvt_thread_mutex_lock( &slap_counters.sc_mutex );
1025         for ( prev = &slap_counters.sc_next, sc = slap_counters.sc_next; sc;
1026                 prev = &sc->sc_next, sc = sc->sc_next ) {
1027                 if ( sc == data ) {
1028                         int i;
1029
1030                         *prev = sc->sc_next;
1031                         /* Copy data to main counter */
1032                         ldap_pvt_mp_add( slap_counters.sc_bytes, sc->sc_bytes );
1033                         ldap_pvt_mp_add( slap_counters.sc_pdu, sc->sc_pdu );
1034                         ldap_pvt_mp_add( slap_counters.sc_entries, sc->sc_entries );
1035                         ldap_pvt_mp_add( slap_counters.sc_refs, sc->sc_refs );
1036                         ldap_pvt_mp_add( slap_counters.sc_ops_initiated, sc->sc_ops_initiated );
1037                         ldap_pvt_mp_add( slap_counters.sc_ops_completed, sc->sc_ops_completed );
1038 #ifdef SLAPD_MONITOR
1039                         for ( i = 0; i < SLAP_OP_LAST; i++ ) {
1040                                 ldap_pvt_mp_add( slap_counters.sc_ops_initiated_[ i ], sc->sc_ops_initiated_[ i ] );
1041                                 ldap_pvt_mp_add( slap_counters.sc_ops_initiated_[ i ], sc->sc_ops_completed_[ i ] );
1042                         }
1043 #endif /* SLAPD_MONITOR */
1044                         slap_counters_destroy( sc );
1045                         ber_memfree_x( data, NULL );
1046                         break;
1047                 }
1048         }
1049         ldap_pvt_thread_mutex_unlock( &slap_counters.sc_mutex );
1050 }
1051
1052 static void
1053 conn_counter_init( Operation *op, void *ctx )
1054 {
1055         slap_counters_t *sc;
1056         void *vsc = NULL;
1057
1058         if ( ldap_pvt_thread_pool_getkey( ctx, conn_counter_init, &vsc, NULL ) || !vsc ) {
1059                 vsc = ch_malloc( sizeof( slap_counters_t ));
1060                 sc = vsc;
1061                 slap_counters_init( sc );
1062                 ldap_pvt_thread_pool_setkey( ctx, conn_counter_init, vsc,
1063                         conn_counter_destroy );
1064
1065                 ldap_pvt_thread_mutex_lock( &slap_counters.sc_mutex );
1066                 sc->sc_next = slap_counters.sc_next;
1067                 slap_counters.sc_next = sc;
1068                 ldap_pvt_thread_mutex_unlock( &slap_counters.sc_mutex );
1069         }
1070         op->o_counters = vsc;
1071 }
1072
1073 static void *
1074 connection_operation( void *ctx, void *arg_v )
1075 {
1076         int rc = LDAP_OTHER;
1077         Operation *op = arg_v;
1078         SlapReply rs = {REP_RESULT};
1079         ber_tag_t tag = op->o_tag;
1080         slap_op_t opidx = SLAP_OP_LAST;
1081         Connection *conn = op->o_conn;
1082         void *memctx = NULL;
1083         void *memctx_null = NULL;
1084         ber_len_t memsiz;
1085
1086         conn_counter_init( op, ctx );
1087         ldap_pvt_thread_mutex_lock( &op->o_counters->sc_mutex );
1088         /* FIXME: returns 0 in case of failure */
1089         ldap_pvt_mp_add_ulong(op->o_counters->sc_ops_initiated, 1);
1090         ldap_pvt_thread_mutex_unlock( &op->o_counters->sc_mutex );
1091
1092         op->o_threadctx = ctx;
1093         op->o_tid = ldap_pvt_thread_pool_tid( ctx );
1094
1095         switch ( tag ) {
1096         case LDAP_REQ_BIND:
1097         case LDAP_REQ_UNBIND:
1098         case LDAP_REQ_ADD:
1099         case LDAP_REQ_DELETE:
1100         case LDAP_REQ_MODDN:
1101         case LDAP_REQ_MODIFY:
1102         case LDAP_REQ_COMPARE:
1103         case LDAP_REQ_SEARCH:
1104         case LDAP_REQ_ABANDON:
1105         case LDAP_REQ_EXTENDED:
1106                 break;
1107         default:
1108                 Debug( LDAP_DEBUG_ANY, "connection_operation: "
1109                         "conn %lu unknown LDAP request 0x%lx\n",
1110                         conn->c_connid, tag, 0 );
1111                 op->o_tag = LBER_ERROR;
1112                 rs.sr_err = LDAP_PROTOCOL_ERROR;
1113                 rs.sr_text = "unknown LDAP request";
1114                 send_ldap_disconnect( op, &rs );
1115                 rc = SLAPD_DISCONNECT;
1116                 goto operations_error;
1117         }
1118
1119         if( conn->c_sasl_bind_in_progress && tag != LDAP_REQ_BIND ) {
1120                 Debug( LDAP_DEBUG_ANY, "connection_operation: "
1121                         "error: SASL bind in progress (tag=%ld).\n",
1122                         (long) tag, 0, 0 );
1123                 send_ldap_error( op, &rs, LDAP_OPERATIONS_ERROR,
1124                         "SASL bind in progress" );
1125                 rc = LDAP_OPERATIONS_ERROR;
1126                 goto operations_error;
1127         }
1128
1129 #ifdef LDAP_X_TXN
1130         if (( conn->c_txn == CONN_TXN_SPECIFY ) && (
1131                 ( tag == LDAP_REQ_ADD ) ||
1132                 ( tag == LDAP_REQ_DELETE ) ||
1133                 ( tag == LDAP_REQ_MODIFY ) ||
1134                 ( tag == LDAP_REQ_MODRDN )))
1135         {
1136                 /* Disable SLAB allocator for all update operations
1137                         issued inside of a transaction */
1138                 op->o_tmpmemctx = NULL;
1139                 op->o_tmpmfuncs = &ch_mfuncs;
1140         } else
1141 #endif
1142         {
1143         /* We can use Thread-Local storage for most mallocs. We can
1144          * also use TL for ber parsing, but not on Add or Modify.
1145          */
1146 #if 0
1147         memsiz = ber_len( op->o_ber ) * 64;
1148         if ( SLAP_SLAB_SIZE > memsiz ) memsiz = SLAP_SLAB_SIZE;
1149 #endif
1150         memsiz = SLAP_SLAB_SIZE;
1151
1152         memctx = slap_sl_mem_create( memsiz, SLAP_SLAB_STACK, ctx, 1 );
1153         op->o_tmpmemctx = memctx;
1154         op->o_tmpmfuncs = &slap_sl_mfuncs;
1155         if ( tag != LDAP_REQ_ADD && tag != LDAP_REQ_MODIFY ) {
1156                 /* Note - the ber and its buffer are already allocated from
1157                  * regular memory; this only affects subsequent mallocs that
1158                  * ber_scanf may invoke.
1159                  */
1160                 ber_set_option( op->o_ber, LBER_OPT_BER_MEMCTX, &memctx );
1161         }
1162         }
1163
1164         opidx = slap_req2op( tag );
1165         assert( opidx != SLAP_OP_LAST );
1166         INCR_OP_INITIATED( opidx );
1167         rc = (*(opfun[opidx]))( op, &rs );
1168
1169 operations_error:
1170         if ( rc == SLAPD_DISCONNECT ) {
1171                 tag = LBER_ERROR;
1172
1173         } else if ( opidx != SLAP_OP_LAST ) {
1174                 /* increment completed operations count
1175                  * only if operation was initiated
1176                  * and rc != SLAPD_DISCONNECT */
1177                 INCR_OP_COMPLETED( opidx );
1178         }
1179
1180         if ( op->o_cancel == SLAP_CANCEL_REQ ) {
1181                 if ( rc == SLAPD_ABANDON ) {
1182                         op->o_cancel = SLAP_CANCEL_ACK;
1183                 } else {
1184                         op->o_cancel = LDAP_TOO_LATE;
1185                 }
1186         }
1187
1188         while ( op->o_cancel != SLAP_CANCEL_NONE &&
1189                 op->o_cancel != SLAP_CANCEL_DONE )
1190         {
1191                 ldap_pvt_thread_yield();
1192         }
1193
1194         ldap_pvt_thread_mutex_lock( &conn->c_mutex );
1195
1196         ber_set_option( op->o_ber, LBER_OPT_BER_MEMCTX, &memctx_null );
1197
1198         LDAP_STAILQ_REMOVE( &conn->c_ops, op, Operation, o_next);
1199         LDAP_STAILQ_NEXT(op, o_next) = NULL;
1200         conn->c_n_ops_executing--;
1201         conn->c_n_ops_completed++;
1202
1203         switch( tag ) {
1204         case LBER_ERROR:
1205         case LDAP_REQ_UNBIND:
1206                 /* c_mutex is locked */
1207                 connection_closing( conn,
1208                         tag == LDAP_REQ_UNBIND ? NULL : "operations error" );
1209                 break;
1210         }
1211
1212         connection_resched( conn );
1213         ldap_pvt_thread_mutex_unlock( &conn->c_mutex );
1214         slap_op_free( op, ctx );
1215         return NULL;
1216 }
1217
1218 static const Listener dummy_list = { BER_BVC(""), BER_BVC("") };
1219
1220 int connection_client_setup(
1221         ber_socket_t s,
1222         ldap_pvt_thread_start_t *func,
1223         void *arg )
1224 {
1225         Connection *c;
1226
1227         c = connection_init( s, (Listener *)&dummy_list, "", "",
1228                 CONN_IS_CLIENT, 0, NULL
1229                 LDAP_PF_LOCAL_SENDMSG_ARG(NULL));
1230         if ( !c ) return -1;
1231
1232         c->c_clientfunc = func;
1233         c->c_clientarg = arg;
1234
1235         slapd_add_internal( s, 0 );
1236         slapd_set_read( s, 1 );
1237         return 0;
1238 }
1239
1240 void connection_client_enable(
1241         ber_socket_t s )
1242 {
1243         slapd_set_read( s, 1 );
1244 }
1245
1246 void connection_client_stop(
1247         ber_socket_t s )
1248 {
1249         Connection *c;
1250         Sockbuf *sb;
1251
1252         /* get (locked) connection */
1253         c = connection_get( s );
1254
1255         assert( c->c_conn_state == SLAP_C_CLIENT );
1256
1257         c->c_listener = NULL;
1258         c->c_conn_state = SLAP_C_INVALID;
1259         c->c_struct_state = SLAP_C_UNUSED;
1260         c->c_close_reason = "?";                        /* should never be needed */
1261         sb = c->c_sb;
1262         c->c_sb = ber_sockbuf_alloc( );
1263         {
1264                 ber_len_t max = sockbuf_max_incoming;
1265                 ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_SET_MAX_INCOMING, &max );
1266         }
1267         slapd_remove( s, sb, 0, 1, 0 );
1268
1269         connection_return( c );
1270 }
1271
1272 static int connection_read( ber_socket_t s, conn_readinfo *cri );
1273
1274 static void* connection_read_thread( void* ctx, void* argv )
1275 {
1276         int rc ;
1277         conn_readinfo cri = { NULL, NULL, NULL, 0 };
1278         ber_socket_t s = (long)argv;
1279
1280         /*
1281          * read incoming LDAP requests. If there is more than one,
1282          * the first one is returned with new_op
1283          */
1284         cri.ctx = ctx;
1285         if( ( rc = connection_read( s, &cri ) ) < 0 ) {
1286                 Debug( LDAP_DEBUG_CONNS, "connection_read(%d) error\n", s, 0, 0 );
1287                 return (void*)(long)rc;
1288         }
1289
1290         /* execute a single queued request in the same thread */
1291         if( cri.op && !cri.nullop ) {
1292                 rc = (long)connection_operation( ctx, cri.op );
1293         } else if ( cri.func ) {
1294                 rc = (long)cri.func( ctx, cri.arg );
1295         }
1296
1297         return (void*)(long)rc;
1298 }
1299
1300 int connection_read_activate( ber_socket_t s )
1301 {
1302         int rc;
1303
1304         /*
1305          * suspend reading on this file descriptor until a connection processing
1306          * thread reads data on it. Otherwise the listener thread will repeatedly
1307          * submit the same event on it to the pool.
1308          */
1309         rc = slapd_clr_read( s, 0 );
1310         if ( rc )
1311                 return rc;
1312
1313         rc = ldap_pvt_thread_pool_submit( &connection_pool,
1314                 connection_read_thread, (void *)(long)s );
1315
1316         if( rc != 0 ) {
1317                 Debug( LDAP_DEBUG_ANY,
1318                         "connection_read_activate(%d): submit failed (%d)\n",
1319                         s, rc, 0 );
1320         }
1321
1322         return rc;
1323 }
1324
1325 static int
1326 connection_read( ber_socket_t s, conn_readinfo *cri )
1327 {
1328         int rc = 0;
1329         Connection *c;
1330
1331         assert( connections != NULL );
1332
1333         /* get (locked) connection */
1334         c = connection_get( s );
1335
1336         if( c == NULL ) {
1337                 Debug( LDAP_DEBUG_ANY,
1338                         "connection_read(%ld): no connection!\n",
1339                         (long) s, 0, 0 );
1340
1341                 return -1;
1342         }
1343
1344         c->c_n_read++;
1345
1346         if( c->c_conn_state == SLAP_C_CLOSING ) {
1347                 Debug( LDAP_DEBUG_TRACE,
1348                         "connection_read(%d): closing, ignoring input for id=%lu\n",
1349                         s, c->c_connid, 0 );
1350                 connection_return( c );
1351                 return 0;
1352         }
1353
1354         if ( c->c_conn_state == SLAP_C_CLIENT ) {
1355                 cri->func = c->c_clientfunc;
1356                 cri->arg = c->c_clientarg;
1357                 /* read should already be cleared */
1358                 connection_return( c );
1359                 return 0;
1360         }
1361
1362         Debug( LDAP_DEBUG_TRACE,
1363                 "connection_read(%d): checking for input on id=%lu\n",
1364                 s, c->c_connid, 0 );
1365
1366 #ifdef HAVE_TLS
1367         if ( c->c_is_tls && c->c_needs_tls_accept ) {
1368                 rc = ldap_pvt_tls_accept( c->c_sb, slap_tls_ctx );
1369                 if ( rc < 0 ) {
1370                         Debug( LDAP_DEBUG_TRACE,
1371                                 "connection_read(%d): TLS accept failure "
1372                                 "error=%d id=%lu, closing\n",
1373                                 s, rc, c->c_connid );
1374
1375                         c->c_needs_tls_accept = 0;
1376                         /* c_mutex is locked */
1377                         connection_closing( c, "TLS negotiation failure" );
1378                         connection_close( c );
1379                         connection_return( c );
1380                         return 0;
1381
1382                 } else if ( rc == 0 ) {
1383                         void *ssl;
1384                         struct berval authid = BER_BVNULL;
1385
1386                         c->c_needs_tls_accept = 0;
1387
1388                         /* we need to let SASL know */
1389                         ssl = ldap_pvt_tls_sb_ctx( c->c_sb );
1390
1391                         c->c_tls_ssf = (slap_ssf_t) ldap_pvt_tls_get_strength( ssl );
1392                         if( c->c_tls_ssf > c->c_ssf ) {
1393                                 c->c_ssf = c->c_tls_ssf;
1394                         }
1395
1396                         rc = dnX509peerNormalize( ssl, &authid );
1397                         if ( rc != LDAP_SUCCESS ) {
1398                                 Debug( LDAP_DEBUG_TRACE, "connection_read(%d): "
1399                                         "unable to get TLS client DN, error=%d id=%lu\n",
1400                                         s, rc, c->c_connid );
1401                         }
1402                         Statslog( LDAP_DEBUG_STATS,
1403                                 "conn=%lu fd=%d TLS established tls_ssf=%u ssf=%u\n",
1404                             c->c_connid, (int) s, c->c_tls_ssf, c->c_ssf, 0 );
1405                         slap_sasl_external( c, c->c_tls_ssf, &authid );
1406                         if ( authid.bv_val ) free( authid.bv_val );
1407                 }
1408
1409                 /* if success and data is ready, fall thru to data input loop */
1410                 if( !ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_DATA_READY, NULL ) )
1411                 {
1412                         slapd_set_read( s, 1 );
1413                         connection_return( c );
1414                         return 0;
1415                 }
1416         }
1417 #endif
1418
1419 #ifdef HAVE_CYRUS_SASL
1420         if ( c->c_sasl_layers ) {
1421                 /* If previous layer is not removed yet, give up for now */
1422                 if ( !c->c_sasl_sockctx ) {
1423                         slapd_set_read( s, 1 );
1424                         connection_return( c );
1425                         return 0;
1426                 }
1427
1428                 c->c_sasl_layers = 0;
1429
1430                 rc = ldap_pvt_sasl_install( c->c_sb, c->c_sasl_sockctx );
1431                 if( rc != LDAP_SUCCESS ) {
1432                         Debug( LDAP_DEBUG_TRACE,
1433                                 "connection_read(%d): SASL install error "
1434                                 "error=%d id=%lu, closing\n",
1435                                 s, rc, c->c_connid );
1436
1437                         /* c_mutex is locked */
1438                         connection_closing( c, "SASL layer install failure" );
1439                         connection_close( c );
1440                         connection_return( c );
1441                         return 0;
1442                 }
1443         }
1444 #endif
1445
1446 #define CONNECTION_INPUT_LOOP 1
1447 /* #define      DATA_READY_LOOP 1 */
1448
1449         do {
1450                 /* How do we do this without getting into a busy loop ? */
1451                 rc = connection_input( c, cri );
1452         }
1453 #ifdef DATA_READY_LOOP
1454         while( !rc && ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_DATA_READY, NULL ));
1455 #elif defined CONNECTION_INPUT_LOOP
1456         while(!rc);
1457 #else
1458         while(0);
1459 #endif
1460
1461         if( rc < 0 ) {
1462                 Debug( LDAP_DEBUG_CONNS,
1463                         "connection_read(%d): input error=%d id=%lu, closing.\n",
1464                         s, rc, c->c_connid );
1465
1466                 /* c_mutex is locked */
1467                 connection_closing( c, conn_lost_str );
1468                 connection_close( c );
1469                 connection_return( c );
1470                 return 0;
1471         }
1472
1473         if ( ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_NEEDS_WRITE, NULL ) ) {
1474                 slapd_set_write( s, 0 );
1475         }
1476
1477         slapd_set_read( s, 1 );
1478         connection_return( c );
1479
1480         return 0;
1481 }
1482
1483 static int
1484 connection_input( Connection *conn , conn_readinfo *cri )
1485 {
1486         Operation *op;
1487         ber_tag_t       tag;
1488         ber_len_t       len;
1489         ber_int_t       msgid;
1490         BerElement      *ber;
1491         int             rc;
1492 #ifdef LDAP_CONNECTIONLESS
1493         Sockaddr        peeraddr;
1494         char            *cdn = NULL;
1495 #endif
1496         char *defer = NULL;
1497         void *ctx;
1498
1499         if ( conn->c_currentber == NULL &&
1500                 ( conn->c_currentber = ber_alloc()) == NULL )
1501         {
1502                 Debug( LDAP_DEBUG_ANY, "ber_alloc failed\n", 0, 0, 0 );
1503                 return -1;
1504         }
1505
1506         sock_errset(0);
1507
1508 #ifdef LDAP_CONNECTIONLESS
1509         if ( conn->c_is_udp ) {
1510                 char peername[sizeof("IP=255.255.255.255:65336")];
1511
1512                 len = ber_int_sb_read(conn->c_sb, &peeraddr, sizeof(struct sockaddr));
1513                 if (len != sizeof(struct sockaddr)) return 1;
1514
1515                 sprintf( peername, "IP=%s:%d",
1516                         inet_ntoa( peeraddr.sa_in_addr.sin_addr ),
1517                         (unsigned) ntohs( peeraddr.sa_in_addr.sin_port ) );
1518                 Statslog( LDAP_DEBUG_STATS,
1519                         "conn=%lu UDP request from %s (%s) accepted.\n",
1520                         conn->c_connid, peername, conn->c_sock_name.bv_val, 0, 0 );
1521         }
1522 #endif
1523
1524         tag = ber_get_next( conn->c_sb, &len, conn->c_currentber );
1525         if ( tag != LDAP_TAG_MESSAGE ) {
1526                 int err = sock_errno();
1527
1528                 if ( err != EWOULDBLOCK && err != EAGAIN ) {
1529                         /* log, close and send error */
1530                         Debug( LDAP_DEBUG_TRACE,
1531                                 "ber_get_next on fd %d failed errno=%d (%s)\n",
1532                         conn->c_sd, err, sock_errstr(err) );
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         ctx = cri->ctx;
1579         op = slap_op_alloc( ber, msgid, tag, conn->c_n_ops_received++, ctx );
1580
1581         op->o_conn = conn;
1582         /* clear state if the connection is being reused from inactive */
1583         if ( conn->c_conn_state == SLAP_C_INACTIVE ) {
1584                 memset( &conn->c_pagedresults_state, 0,
1585                         sizeof( conn->c_pagedresults_state ) );
1586         }
1587
1588         op->o_res_ber = NULL;
1589
1590 #ifdef LDAP_CONNECTIONLESS
1591         if (conn->c_is_udp) {
1592                 if ( cdn ) {
1593                         ber_str2bv( cdn, 0, 1, &op->o_dn );
1594                         op->o_protocol = LDAP_VERSION2;
1595                 }
1596                 op->o_res_ber = ber_alloc_t( LBER_USE_DER );
1597                 if (op->o_res_ber == NULL) return 1;
1598
1599                 rc = ber_write( op->o_res_ber, (char *)&peeraddr,
1600                         sizeof(struct sockaddr), 0 );
1601
1602                 if (rc != sizeof(struct sockaddr)) {
1603                         Debug( LDAP_DEBUG_ANY, "ber_write failed\n", 0, 0, 0 );
1604                         return 1;
1605                 }
1606
1607                 if (op->o_protocol == LDAP_VERSION2) {
1608                         rc = ber_printf(op->o_res_ber, "{is{" /*}}*/, op->o_msgid, "");
1609                         if (rc == -1) {
1610                                 Debug( LDAP_DEBUG_ANY, "ber_write failed\n", 0, 0, 0 );
1611                                 return rc;
1612                         }
1613                 }
1614         }
1615 #endif /* LDAP_CONNECTIONLESS */
1616
1617         rc = 0;
1618
1619         /* Don't process requests when the conn is in the middle of a
1620          * Bind, or if it's closing. Also, don't let any single conn
1621          * use up all the available threads, and don't execute if we're
1622          * currently blocked on output. And don't execute if there are
1623          * already pending ops, let them go first.  Abandon operations
1624          * get exceptions to some, but not all, cases.
1625          */
1626         switch( tag ){
1627         default:
1628                 /* Abandon and Unbind are exempt from these checks */
1629                 if (conn->c_conn_state == SLAP_C_CLOSING) {
1630                         defer = "closing";
1631                         break;
1632                 } else if (conn->c_writewaiter) {
1633                         defer = "awaiting write";
1634                         break;
1635                 } else if (conn->c_n_ops_pending) {
1636                         defer = "pending operations";
1637                         break;
1638                 }
1639                 /* FALLTHRU */
1640         case LDAP_REQ_ABANDON:
1641                 /* Unbind is exempt from these checks */
1642                 if (conn->c_n_ops_executing >= connection_pool_max/2) {
1643                         defer = "too many executing";
1644                         break;
1645                 } else if (conn->c_conn_state == SLAP_C_BINDING) {
1646                         defer = "binding";
1647                         break;
1648                 }
1649                 /* FALLTHRU */
1650         case LDAP_REQ_UNBIND:
1651                 break;
1652         }
1653
1654         if( defer ) {
1655                 int max = conn->c_dn.bv_len
1656                         ? slap_conn_max_pending_auth
1657                         : slap_conn_max_pending;
1658
1659                 Debug( LDAP_DEBUG_ANY,
1660                         "connection_input: conn=%lu deferring operation: %s\n",
1661                         conn->c_connid, defer, 0 );
1662                 conn->c_n_ops_pending++;
1663                 LDAP_STAILQ_INSERT_TAIL( &conn->c_pending_ops, op, o_next );
1664                 rc = ( conn->c_n_ops_pending > max ) ? -1 : 0;
1665
1666         } else {
1667                 conn->c_n_ops_executing++;
1668
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         }
1688
1689 #ifdef NO_THREADS
1690         if ( conn->c_struct_state != SLAP_C_USED ) {
1691                 /* connection must have got closed underneath us */
1692                 return 1;
1693         }
1694 #endif
1695
1696         assert( conn->c_struct_state == SLAP_C_USED );
1697         return rc;
1698 }
1699
1700 static int
1701 connection_resched( Connection *conn )
1702 {
1703         Operation *op;
1704
1705         if( conn->c_conn_state == SLAP_C_CLOSING ) {
1706                 Debug( LDAP_DEBUG_TRACE, "connection_resched: "
1707                         "attempting closing conn=%lu sd=%d\n",
1708                         conn->c_connid, conn->c_sd, 0 );
1709                 connection_close( conn );
1710                 return 0;
1711         }
1712
1713         if( conn->c_conn_state != SLAP_C_ACTIVE || conn->c_writewaiter ) {
1714                 /* other states need different handling */
1715                 return 0;
1716         }
1717
1718         while ((op = LDAP_STAILQ_FIRST( &conn->c_pending_ops )) != NULL) {
1719                 if ( conn->c_n_ops_executing > connection_pool_max/2 ) break;
1720
1721                 LDAP_STAILQ_REMOVE_HEAD( &conn->c_pending_ops, o_next );
1722                 LDAP_STAILQ_NEXT(op, o_next) = NULL;
1723
1724                 /* pending operations should not be marked for abandonment */
1725                 assert(!op->o_abandon);
1726
1727                 conn->c_n_ops_pending--;
1728                 conn->c_n_ops_executing++;
1729
1730                 connection_op_activate( op );
1731
1732                 if ( conn->c_conn_state == SLAP_C_BINDING ) break;
1733         }
1734         return 0;
1735 }
1736
1737 static void
1738 connection_init_log_prefix( Operation *op )
1739 {
1740         if ( op->o_connid == (unsigned long)(-1) ) {
1741                 snprintf( op->o_log_prefix, sizeof( op->o_log_prefix ),
1742                         "conn=-1 op=%lu", op->o_opid );
1743
1744         } else {
1745                 snprintf( op->o_log_prefix, sizeof( op->o_log_prefix ),
1746                         "conn=%lu op=%lu", op->o_connid, op->o_opid );
1747         }
1748 }
1749
1750 static int connection_bind_cleanup_cb( Operation *op, SlapReply *rs )
1751 {
1752         op->o_conn->c_sasl_bindop = NULL;
1753
1754         ch_free( op->o_callback );
1755         op->o_callback = NULL;
1756
1757         return SLAP_CB_CONTINUE;
1758 }
1759
1760 static int connection_bind_cb( Operation *op, SlapReply *rs )
1761 {
1762         ldap_pvt_thread_mutex_lock( &op->o_conn->c_mutex );
1763         if ( op->o_conn->c_conn_state == SLAP_C_BINDING )
1764                 op->o_conn->c_conn_state = SLAP_C_ACTIVE;
1765         op->o_conn->c_sasl_bind_in_progress =
1766                 ( rs->sr_err == LDAP_SASL_BIND_IN_PROGRESS );
1767
1768         /* Moved here from bind.c due to ITS#4158 */
1769         op->o_conn->c_sasl_bindop = NULL;
1770         if ( op->orb_method == LDAP_AUTH_SASL ) {
1771                 if( rs->sr_err == LDAP_SUCCESS ) {
1772                         ber_dupbv(&op->o_conn->c_dn, &op->orb_edn);
1773                         if( !BER_BVISEMPTY( &op->orb_edn ) ) {
1774                                 /* edn is always normalized already */
1775                                 ber_dupbv( &op->o_conn->c_ndn, &op->o_conn->c_dn );
1776                         }
1777                         op->o_tmpfree( op->orb_edn.bv_val, op->o_tmpmemctx );
1778                         BER_BVZERO( &op->orb_edn );
1779                         op->o_conn->c_authmech = op->o_conn->c_sasl_bind_mech;
1780                         BER_BVZERO( &op->o_conn->c_sasl_bind_mech );
1781
1782                         op->o_conn->c_sasl_ssf = op->orb_ssf;
1783                         if( op->orb_ssf > op->o_conn->c_ssf ) {
1784                                 op->o_conn->c_ssf = op->orb_ssf;
1785                         }
1786
1787                         if( !BER_BVISEMPTY( &op->o_conn->c_dn ) ) {
1788                                 ber_len_t max = sockbuf_max_incoming_auth;
1789                                 ber_sockbuf_ctrl( op->o_conn->c_sb,
1790                                         LBER_SB_OPT_SET_MAX_INCOMING, &max );
1791                         }
1792
1793                         /* log authorization identity */
1794                         Statslog( LDAP_DEBUG_STATS,
1795                                 "%s BIND dn=\"%s\" mech=%s sasl_ssf=%d ssf=%d\n",
1796                                 op->o_log_prefix,
1797                                 BER_BVISNULL( &op->o_conn->c_dn ) ? "<empty>" : op->o_conn->c_dn.bv_val,
1798                                 op->o_conn->c_authmech.bv_val,
1799                                 op->orb_ssf, op->o_conn->c_ssf );
1800
1801                         Debug( LDAP_DEBUG_TRACE,
1802                                 "do_bind: SASL/%s bind: dn=\"%s\" sasl_ssf=%d\n",
1803                                 op->o_conn->c_authmech.bv_val,
1804                                 BER_BVISNULL( &op->o_conn->c_dn ) ? "<empty>" : op->o_conn->c_dn.bv_val,
1805                                 op->orb_ssf );
1806
1807                 } else if ( rs->sr_err != LDAP_SASL_BIND_IN_PROGRESS ) {
1808                         if ( !BER_BVISNULL( &op->o_conn->c_sasl_bind_mech ) ) {
1809                                 free( op->o_conn->c_sasl_bind_mech.bv_val );
1810                                 BER_BVZERO( &op->o_conn->c_sasl_bind_mech );
1811                         }
1812                 }
1813         }
1814         ldap_pvt_thread_mutex_unlock( &op->o_conn->c_mutex );
1815
1816         ch_free( op->o_callback );
1817         op->o_callback = NULL;
1818
1819         return SLAP_CB_CONTINUE;
1820 }
1821
1822 static void connection_op_queue( Operation *op )
1823 {
1824         ber_tag_t tag = op->o_tag;
1825
1826         if (tag == LDAP_REQ_BIND) {
1827                 slap_callback *sc = ch_calloc( 1, sizeof( slap_callback ));
1828                 sc->sc_response = connection_bind_cb;
1829                 sc->sc_cleanup = connection_bind_cleanup_cb;
1830                 sc->sc_next = op->o_callback;
1831                 op->o_callback = sc;
1832                 op->o_conn->c_conn_state = SLAP_C_BINDING;
1833         }
1834
1835         if (!op->o_dn.bv_len) {
1836                 op->o_authz = op->o_conn->c_authz;
1837                 if ( BER_BVISNULL( &op->o_conn->c_sasl_authz_dn )) {
1838                         ber_dupbv( &op->o_dn, &op->o_conn->c_dn );
1839                         ber_dupbv( &op->o_ndn, &op->o_conn->c_ndn );
1840                 } else {
1841                         ber_dupbv( &op->o_dn, &op->o_conn->c_sasl_authz_dn );
1842                         ber_dupbv( &op->o_ndn, &op->o_conn->c_sasl_authz_dn );
1843                 }
1844         }
1845
1846         op->o_authtype = op->o_conn->c_authtype;
1847         ber_dupbv( &op->o_authmech, &op->o_conn->c_authmech );
1848
1849         if (!op->o_protocol) {
1850                 op->o_protocol = op->o_conn->c_protocol
1851                         ? op->o_conn->c_protocol : LDAP_VERSION3;
1852         }
1853
1854         if (op->o_conn->c_conn_state == SLAP_C_INACTIVE &&
1855                 op->o_protocol > LDAP_VERSION2)
1856         {
1857                 op->o_conn->c_conn_state = SLAP_C_ACTIVE;
1858         }
1859
1860         op->o_connid = op->o_conn->c_connid;
1861         connection_init_log_prefix( op );
1862
1863         LDAP_STAILQ_INSERT_TAIL( &op->o_conn->c_ops, op, o_next );
1864 }
1865
1866 static int connection_op_activate( Operation *op )
1867 {
1868         int rc;
1869
1870         connection_op_queue( op );
1871
1872         rc = ldap_pvt_thread_pool_submit( &connection_pool,
1873                 connection_operation, (void *) op );
1874
1875         if ( rc != 0 ) {
1876                 Debug( LDAP_DEBUG_ANY,
1877                         "connection_op_activate: submit failed (%d) for conn=%lu\n",
1878                         rc, op->o_connid, 0 );
1879                 /* should move op to pending list */
1880         }
1881
1882         return rc;
1883 }
1884
1885 int connection_write(ber_socket_t s)
1886 {
1887         Connection *c;
1888         Operation *op;
1889
1890         assert( connections != NULL );
1891
1892         slapd_clr_write( s, 0 );
1893
1894         c = connection_get( s );
1895         if( c == NULL ) {
1896                 Debug( LDAP_DEBUG_ANY,
1897                         "connection_write(%ld): no connection!\n",
1898                         (long)s, 0, 0 );
1899                 return -1;
1900         }
1901
1902         c->c_n_write++;
1903
1904         Debug( LDAP_DEBUG_TRACE,
1905                 "connection_write(%d): waking output for id=%lu\n",
1906                 s, c->c_connid, 0 );
1907         ldap_pvt_thread_cond_signal( &c->c_write_cv );
1908
1909         if ( ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_NEEDS_READ, NULL ) ) {
1910                 slapd_set_read( s, 1 );
1911         }
1912         if ( ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_NEEDS_WRITE, NULL ) ) {
1913                 slapd_set_write( s, 1 );
1914         }
1915
1916         /* If there are ops pending because of a writewaiter,
1917          * start one up.
1918          */
1919         while ((op = LDAP_STAILQ_FIRST( &c->c_pending_ops )) != NULL) {
1920                 if ( !c->c_writewaiter ) break;
1921                 if ( c->c_n_ops_executing > connection_pool_max/2 ) break;
1922
1923                 LDAP_STAILQ_REMOVE_HEAD( &c->c_pending_ops, o_next );
1924                 LDAP_STAILQ_NEXT(op, o_next) = NULL;
1925
1926                 /* pending operations should not be marked for abandonment */
1927                 assert(!op->o_abandon);
1928
1929                 c->c_n_ops_pending--;
1930                 c->c_n_ops_executing++;
1931
1932                 connection_op_activate( op );
1933
1934                 break;
1935         }
1936
1937         connection_return( c );
1938         return 0;
1939 }
1940
1941 #ifdef LDAP_SLAPI
1942 typedef struct conn_fake_extblock {
1943         void *eb_conn;
1944         void *eb_op;
1945 } conn_fake_extblock;
1946
1947 static void
1948 connection_fake_destroy(
1949         void *key,
1950         void *data )
1951 {
1952         Connection conn = {0};
1953         Operation op = {0};
1954         Opheader ohdr = {0};
1955
1956         conn_fake_extblock *eb = data;
1957
1958         op.o_hdr = &ohdr;
1959         op.o_hdr->oh_extensions = eb->eb_op;
1960         conn.c_extensions = eb->eb_conn;
1961         op.o_conn = &conn;
1962         conn.c_connid = -1;
1963         op.o_connid = -1;
1964
1965         ber_memfree_x( eb, NULL );
1966         slapi_int_free_object_extensions( SLAPI_X_EXT_OPERATION, &op );
1967         slapi_int_free_object_extensions( SLAPI_X_EXT_CONNECTION, &conn );
1968 }
1969 #endif
1970
1971 void
1972 connection_fake_init(
1973         Connection *conn,
1974         OperationBuffer *opbuf,
1975         void *ctx )
1976 {
1977         connection_fake_init2( conn, opbuf, ctx, 1 );
1978 }
1979
1980 void
1981 connection_fake_init2(
1982         Connection *conn,
1983         OperationBuffer *opbuf,
1984         void *ctx,
1985         int newmem )
1986 {
1987         Operation *op = (Operation *) opbuf;
1988
1989         conn->c_connid = -1;
1990         conn->c_conn_idx = -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( opbuf, 0, sizeof( *opbuf ));
1999         op->o_hdr = &opbuf->ob_hdr;
2000         op->o_controls = opbuf->ob_controls;
2001
2002         /* set memory context */
2003         op->o_tmpmemctx = slap_sl_mem_create(SLAP_SLAB_SIZE, SLAP_SLAB_STACK, ctx,
2004                 newmem );
2005         op->o_tmpmfuncs = &slap_sl_mfuncs;
2006         op->o_threadctx = ctx;
2007         op->o_tid = ldap_pvt_thread_pool_tid( ctx );
2008
2009         op->o_counters = &slap_counters;
2010         op->o_conn = conn;
2011         op->o_connid = op->o_conn->c_connid;
2012         connection_init_log_prefix( op );
2013
2014 #ifdef LDAP_SLAPI
2015         if ( slapi_plugins_used ) {
2016                 conn_fake_extblock *eb;
2017                 void *ebx = NULL;
2018
2019                 /* Use thread keys to make sure these eventually get cleaned up */
2020                 if ( ldap_pvt_thread_pool_getkey( ctx, connection_fake_init, &ebx,
2021                         NULL )) {
2022                         eb = ch_malloc( sizeof( *eb ));
2023                         slapi_int_create_object_extensions( SLAPI_X_EXT_CONNECTION, conn );
2024                         slapi_int_create_object_extensions( SLAPI_X_EXT_OPERATION, op );
2025                         eb->eb_conn = conn->c_extensions;
2026                         eb->eb_op = op->o_hdr->oh_extensions;
2027                         ldap_pvt_thread_pool_setkey( ctx, connection_fake_init, eb,
2028                                 connection_fake_destroy );
2029                 } else {
2030                         eb = ebx;
2031                         conn->c_extensions = eb->eb_conn;
2032                         op->o_hdr->oh_extensions = eb->eb_op;
2033                 }
2034         }
2035 #endif /* LDAP_SLAPI */
2036
2037         slap_op_time( &op->o_time, &op->o_tincr );
2038 }
2039
2040 void
2041 connection_assign_nextid( Connection *conn )
2042 {
2043         ldap_pvt_thread_mutex_lock( &conn_nextid_mutex );
2044         conn->c_connid = conn_nextid++;
2045         ldap_pvt_thread_mutex_unlock( &conn_nextid_mutex );
2046 }