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 1998-2009 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_write1_mutex );
 167                         ldap_pvt_thread_mutex_destroy( &connections[i].c_write2_mutex );
 168                         ldap_pvt_thread_cond_destroy( &connections[i].c_write1_cv );
 169                         ldap_pvt_thread_cond_destroy( &connections[i].c_write2_cv );
 170 #ifdef LDAP_SLAPI
 171                         if ( slapi_plugins_used ) {
 172                                 slapi_int_free_object_extensions( SLAPI_X_EXT_CONNECTION,
 173                                         &connections[i] );
 174                         }
 175 #endif
 176                 }
 177         }
 178
 179         free( connections );
 180         connections = NULL;
 181
 182         ldap_pvt_thread_mutex_destroy( &connections_mutex );
 183         ldap_pvt_thread_mutex_destroy( &conn_nextid_mutex );
 184         return 0;
 185 }
 186
 187 /*
 188  * shutdown all connections
 189  */
 190 int connections_shutdown(void)
 191 {
 192         ber_socket_t i;
 193
 194         for ( i = 0; i < dtblsize; i++ ) {
 195                 if( connections[i].c_struct_state != SLAP_C_UNINITIALIZED ) {
 196                         ldap_pvt_thread_mutex_lock( &connections[i].c_mutex );
 197                         if( connections[i].c_struct_state == SLAP_C_USED ) {
 198
 199                                 /* give persistent clients a chance to cleanup */
 200                                 if( connections[i].c_conn_state == SLAP_C_CLIENT ) {
 201                                         ldap_pvt_thread_pool_submit( &connection_pool,
 202                                         connections[i].c_clientfunc, connections[i].c_clientarg );
 203                                 } else {
 204                                         /* c_mutex is locked */
 205                                         connection_closing( &connections[i], "slapd shutdown" );
 206                                         connection_close( &connections[i] );
 207                                 }
 208                         }
 209                         ldap_pvt_thread_mutex_unlock( &connections[i].c_mutex );
 210                 }
 211         }
 212
 213         return 0;
 214 }
 215
 216 /*
 217  * Timeout idle connections.
 218  */
 219 int connections_timeout_idle(time_t now)
 220 {
 221         int i = 0, writers = 0;
 222         int connindex;
 223         Connection* c;
 224         time_t old;
 225
 226         old = slapd_get_writetime();
 227
 228         for( c = connection_first( &connindex );
 229                 c != NULL;
 230                 c = connection_next( c, &connindex ) )
 231         {
 232                 /* Don't timeout a slow-running request or a persistent
 233                  * outbound connection. But if it has a writewaiter, see
 234                  * if the waiter has been there too long.
 235                  */
 236                 if(( c->c_n_ops_executing && !c->c_writewaiter)
 237                         || c->c_conn_state == SLAP_C_CLIENT ) {
 238                         continue;
 239                 }
 240
 241                 if( difftime( c->c_activitytime+global_idletimeout, now) < 0 ) {
 242                         /* close it */
 243                         connection_closing( c, "idletimeout" );
 244                         connection_close( c );
 245                         i++;
 246                         continue;
 247                 }
 248                 if ( c->c_writewaiter ) {
 249                         writers = 1;
 250                         if( difftime( c->c_activitytime+global_writetimeout, now) < 0 ) {
 251                                 /* close it */
 252                                 connection_closing( c, "writetimeout" );
 253                                 connection_close( c );
 254                                 i++;
 255                         }
 256                 }
 257         }
 258         connection_done( c );
 259         if ( !writers )
 260                 slapd_clr_writetime( old );
 261
 262         return i;
 263 }
 264
 265 static Connection* connection_get( ber_socket_t s )
 266 {
 267         Connection *c;
 268
 269         Debug( LDAP_DEBUG_ARGS,
 270                 "connection_get(%ld)\n",
 271                 (long) s, 0, 0 );
 272
 273         assert( connections != NULL );
 274
 275         if(s == AC_SOCKET_INVALID) return NULL;
 276
 277         assert( s < dtblsize );
 278         c = &connections[s];
 279
 280         if( c != NULL ) {
 281                 ldap_pvt_thread_mutex_lock( &c->c_mutex );
 282
 283                 assert( c->c_struct_state != SLAP_C_UNINITIALIZED );
 284
 285                 if( c->c_struct_state != SLAP_C_USED ) {
 286                         /* connection must have been closed due to resched */
 287
 288                         assert( c->c_conn_state == SLAP_C_INVALID );
 289                         assert( c->c_sd == AC_SOCKET_INVALID );
 290
 291                         Debug( LDAP_DEBUG_CONNS,
 292                                 "connection_get(%d): connection not used\n",
 293                                 s, 0, 0 );
 294
 295                         ldap_pvt_thread_mutex_unlock( &c->c_mutex );
 296                         return NULL;
 297                 }
 298
 299                 Debug( LDAP_DEBUG_TRACE,
 300                         "connection_get(%d): got connid=%lu\n",
 301                         s, c->c_connid, 0 );
 302
 303                 c->c_n_get++;
 304
 305                 assert( c->c_struct_state == SLAP_C_USED );
 306                 assert( c->c_conn_state != SLAP_C_INVALID );
 307                 assert( c->c_sd != AC_SOCKET_INVALID );
 308
 309 #ifndef SLAPD_MONITOR
 310                 if ( global_idletimeout > 0 )
 311 #endif /* ! SLAPD_MONITOR */
 312                 {
 313                         c->c_activitytime = slap_get_time();
 314                 }
 315         }
 316
 317         return c;
 318 }
 319
 320 static void connection_return( Connection *c )
 321 {
 322         ldap_pvt_thread_mutex_unlock( &c->c_mutex );
 323 }
 324
 325 Connection * connection_init(
 326         ber_socket_t s,
 327         Listener *listener,
 328         const char* dnsname,
 329         const char* peername,
 330         int flags,
 331         slap_ssf_t ssf,
 332         struct berval *authid
 333         LDAP_PF_LOCAL_SENDMSG_ARG(struct berval *peerbv))
 334 {
 335         unsigned long id;
 336         Connection *c;
 337         int doinit = 0;
 338         ber_socket_t sfd = SLAP_FD2SOCK(s);
 339
 340         assert( connections != NULL );
 341
 342         assert( listener != NULL );
 343         assert( dnsname != NULL );
 344         assert( peername != NULL );
 345
 346 #ifndef HAVE_TLS
 347         assert( !( flags & CONN_IS_TLS ));
 348 #endif
 349
 350         if( s == AC_SOCKET_INVALID ) {
 351                 Debug( LDAP_DEBUG_ANY,
 352                         "connection_init: init of socket %ld invalid.\n", (long)s, 0, 0 );
 353                 return NULL;
 354         }
 355
 356         assert( s >= 0 );
 357         assert( s < dtblsize );
 358         c = &connections[s];
 359         if( c->c_struct_state == SLAP_C_UNINITIALIZED ) {
 360                 doinit = 1;
 361         } else {
 362                 assert( c->c_struct_state == SLAP_C_UNUSED );
 363         }
 364
 365         if( doinit ) {
 366                 c->c_send_ldap_result = slap_send_ldap_result;
 367                 c->c_send_search_entry = slap_send_search_entry;
 368                 c->c_send_search_reference = slap_send_search_reference;
 369                 c->c_send_ldap_extended = slap_send_ldap_extended;
 370                 c->c_send_ldap_intermediate = slap_send_ldap_intermediate;
 371
 372                 BER_BVZERO( &c->c_authmech );
 373                 BER_BVZERO( &c->c_dn );
 374                 BER_BVZERO( &c->c_ndn );
 375
 376                 c->c_listener = NULL;
 377                 BER_BVZERO( &c->c_peer_domain );
 378                 BER_BVZERO( &c->c_peer_name );
 379
 380                 LDAP_STAILQ_INIT(&c->c_ops);
 381                 LDAP_STAILQ_INIT(&c->c_pending_ops);
 382
 383 #ifdef LDAP_X_TXN
 384                 c->c_txn = CONN_TXN_INACTIVE;
 385                 c->c_txn_backend = NULL;
 386                 LDAP_STAILQ_INIT(&c->c_txn_ops);
 387 #endif
 388
 389                 BER_BVZERO( &c->c_sasl_bind_mech );
 390                 c->c_sasl_done = 0;
 391                 c->c_sasl_authctx = NULL;
 392                 c->c_sasl_sockctx = NULL;
 393                 c->c_sasl_extra = NULL;
 394                 c->c_sasl_bindop = NULL;
 395
 396                 c->c_sb = ber_sockbuf_alloc( );
 397
 398                 {
 399                         ber_len_t max = sockbuf_max_incoming;
 400                         ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_SET_MAX_INCOMING, &max );
 401                 }
 402
 403                 c->c_currentber = NULL;
 404
 405                 /* should check status of thread calls */
 406                 ldap_pvt_thread_mutex_init( &c->c_mutex );
 407                 ldap_pvt_thread_mutex_init( &c->c_write1_mutex );
 408                 ldap_pvt_thread_mutex_init( &c->c_write2_mutex );
 409                 ldap_pvt_thread_cond_init( &c->c_write1_cv );
 410                 ldap_pvt_thread_cond_init( &c->c_write2_cv );
 411
 412 #ifdef LDAP_SLAPI
 413                 if ( slapi_plugins_used ) {
 414                         slapi_int_create_object_extensions( SLAPI_X_EXT_CONNECTION, c );
 415                 }
 416 #endif
 417         }
 418
 419         ldap_pvt_thread_mutex_lock( &c->c_mutex );
 420
 421         assert( BER_BVISNULL( &c->c_authmech ) );
 422         assert( BER_BVISNULL( &c->c_dn ) );
 423         assert( BER_BVISNULL( &c->c_ndn ) );
 424         assert( c->c_listener == NULL );
 425         assert( BER_BVISNULL( &c->c_peer_domain ) );
 426         assert( BER_BVISNULL( &c->c_peer_name ) );
 427         assert( LDAP_STAILQ_EMPTY(&c->c_ops) );
 428         assert( LDAP_STAILQ_EMPTY(&c->c_pending_ops) );
 429 #ifdef LDAP_X_TXN
 430         assert( c->c_txn == CONN_TXN_INACTIVE );
 431         assert( c->c_txn_backend == NULL );
 432         assert( LDAP_STAILQ_EMPTY(&c->c_txn_ops) );
 433 #endif
 434         assert( BER_BVISNULL( &c->c_sasl_bind_mech ) );
 435         assert( c->c_sasl_done == 0 );
 436         assert( c->c_sasl_authctx == NULL );
 437         assert( c->c_sasl_sockctx == NULL );
 438         assert( c->c_sasl_extra == NULL );
 439         assert( c->c_sasl_bindop == NULL );
 440         assert( c->c_currentber == NULL );
 441         assert( c->c_writewaiter == 0);
 442         assert( c->c_writers == 0);
 443
 444         c->c_listener = listener;
 445         c->c_sd = s;
 446
 447         if ( flags & CONN_IS_CLIENT ) {
 448                 c->c_connid = 0;
 449                 ldap_pvt_thread_mutex_lock( &connections_mutex );
 450                 c->c_conn_state = SLAP_C_CLIENT;
 451                 c->c_struct_state = SLAP_C_USED;
 452                 ldap_pvt_thread_mutex_unlock( &connections_mutex );
 453                 c->c_close_reason = "?";                        /* should never be needed */
 454                 ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_SET_FD, &sfd );
 455                 ldap_pvt_thread_mutex_unlock( &c->c_mutex );
 456
 457                 return c;
 458         }
 459
 460         ber_str2bv( dnsname, 0, 1, &c->c_peer_domain );
 461         ber_str2bv( peername, 0, 1, &c->c_peer_name );
 462
 463         c->c_n_ops_received = 0;
 464         c->c_n_ops_executing = 0;
 465         c->c_n_ops_pending = 0;
 466         c->c_n_ops_completed = 0;
 467
 468         c->c_n_get = 0;
 469         c->c_n_read = 0;
 470         c->c_n_write = 0;
 471
 472         /* set to zero until bind, implies LDAP_VERSION3 */
 473         c->c_protocol = 0;
 474
 475 #ifndef SLAPD_MONITOR
 476         if ( global_idletimeout > 0 )
 477 #endif /* ! SLAPD_MONITOR */
 478         {
 479                 c->c_activitytime = c->c_starttime = slap_get_time();
 480         }
 481
 482 #ifdef LDAP_CONNECTIONLESS
 483         c->c_is_udp = 0;
 484         if( flags & CONN_IS_UDP ) {
 485                 c->c_is_udp = 1;
 486 #ifdef LDAP_DEBUG
 487                 ber_sockbuf_add_io( c->c_sb, &ber_sockbuf_io_debug,
 488                         LBER_SBIOD_LEVEL_PROVIDER, (void*)"udp_" );
 489 #endif
 490                 ber_sockbuf_add_io( c->c_sb, &ber_sockbuf_io_udp,
 491                         LBER_SBIOD_LEVEL_PROVIDER, (void *)&sfd );
 492                 ber_sockbuf_add_io( c->c_sb, &ber_sockbuf_io_readahead,
 493                         LBER_SBIOD_LEVEL_PROVIDER, NULL );
 494         } else
 495 #endif /* LDAP_CONNECTIONLESS */
 496 #ifdef LDAP_PF_LOCAL
 497         if ( flags & CONN_IS_IPC ) {
 498 #ifdef LDAP_DEBUG
 499                 ber_sockbuf_add_io( c->c_sb, &ber_sockbuf_io_debug,
 500                         LBER_SBIOD_LEVEL_PROVIDER, (void*)"ipc_" );
 501 #endif
 502                 ber_sockbuf_add_io( c->c_sb, &ber_sockbuf_io_fd,
 503                         LBER_SBIOD_LEVEL_PROVIDER, (void *)&sfd );
 504 #ifdef LDAP_PF_LOCAL_SENDMSG
 505                 if ( !BER_BVISEMPTY( peerbv ))
 506                         ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_UNGET_BUF, peerbv );
 507 #endif
 508         } else
 509 #endif /* LDAP_PF_LOCAL */
 510         {
 511 #ifdef LDAP_DEBUG
 512                 ber_sockbuf_add_io( c->c_sb, &ber_sockbuf_io_debug,
 513                         LBER_SBIOD_LEVEL_PROVIDER, (void*)"tcp_" );
 514 #endif
 515                 ber_sockbuf_add_io( c->c_sb, &ber_sockbuf_io_tcp,
 516                         LBER_SBIOD_LEVEL_PROVIDER, (void *)&sfd );
 517         }
 518
 519 #ifdef LDAP_DEBUG
 520         ber_sockbuf_add_io( c->c_sb, &ber_sockbuf_io_debug,
 521                 INT_MAX, (void*)"ldap_" );
 522 #endif
 523
 524         if( ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_SET_NONBLOCK,
 525                 c /* non-NULL */ ) < 0 )
 526         {
 527                 Debug( LDAP_DEBUG_ANY,
 528                         "connection_init(%d, %s): set nonblocking failed\n",
 529                         s, c->c_peer_name.bv_val, 0 );
 530         }
 531
 532         ldap_pvt_thread_mutex_lock( &conn_nextid_mutex );
 533         id = c->c_connid = conn_nextid++;
 534         ldap_pvt_thread_mutex_unlock( &conn_nextid_mutex );
 535
 536         ldap_pvt_thread_mutex_lock( &connections_mutex );
 537         c->c_conn_state = SLAP_C_INACTIVE;
 538         c->c_struct_state = SLAP_C_USED;
 539         ldap_pvt_thread_mutex_unlock( &connections_mutex );
 540         c->c_close_reason = "?";                        /* should never be needed */
 541
 542         c->c_ssf = c->c_transport_ssf = ssf;
 543         c->c_tls_ssf = 0;
 544
 545 #ifdef HAVE_TLS
 546         if ( flags & CONN_IS_TLS ) {
 547                 c->c_is_tls = 1;
 548                 c->c_needs_tls_accept = 1;
 549         } else {
 550                 c->c_is_tls = 0;
 551                 c->c_needs_tls_accept = 0;
 552         }
 553 #endif
 554
 555         slap_sasl_open( c, 0 );
 556         slap_sasl_external( c, ssf, authid );
 557
 558         slapd_add_internal( s, 1 );
 559         ldap_pvt_thread_mutex_unlock( &c->c_mutex );
 560
 561         backend_connection_init(c);
 562
 563         return c;
 564 }
 565
 566 void connection2anonymous( Connection *c )
 567 {
 568         assert( connections != NULL );
 569         assert( c != NULL );
 570
 571         {
 572                 ber_len_t max = sockbuf_max_incoming;
 573                 ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_SET_MAX_INCOMING, &max );
 574         }
 575
 576         if ( !BER_BVISNULL( &c->c_authmech ) ) {
 577                 ch_free(c->c_authmech.bv_val);
 578         }
 579         BER_BVZERO( &c->c_authmech );
 580
 581         if ( !BER_BVISNULL( &c->c_dn ) ) {
 582                 ch_free(c->c_dn.bv_val);
 583         }
 584         BER_BVZERO( &c->c_dn );
 585
 586         if ( !BER_BVISNULL( &c->c_ndn ) ) {
 587                 ch_free(c->c_ndn.bv_val);
 588         }
 589         BER_BVZERO( &c->c_ndn );
 590
 591         if ( !BER_BVISNULL( &c->c_sasl_authz_dn ) ) {
 592                 ber_memfree_x( c->c_sasl_authz_dn.bv_val, NULL );
 593         }
 594         BER_BVZERO( &c->c_sasl_authz_dn );
 595
 596         c->c_authz_backend = NULL;
 597 }
 598
 599 static void
 600 connection_destroy( Connection *c )
 601 {
 602         unsigned long   connid;
 603         const char              *close_reason;
 604         Sockbuf                 *sb;
 605         ber_socket_t    sd;
 606
 607         assert( connections != NULL );
 608         assert( c != NULL );
 609         assert( c->c_struct_state != SLAP_C_UNUSED );
 610         assert( c->c_conn_state != SLAP_C_INVALID );
 611         assert( LDAP_STAILQ_EMPTY(&c->c_ops) );
 612         assert( LDAP_STAILQ_EMPTY(&c->c_pending_ops) );
 613 #ifdef LDAP_X_TXN
 614         assert( c->c_txn == CONN_TXN_INACTIVE );
 615         assert( c->c_txn_backend == NULL );
 616         assert( LDAP_STAILQ_EMPTY(&c->c_txn_ops) );
 617 #endif
 618         assert( c->c_writewaiter == 0);
 619         assert( c->c_writers == 0);
 620
 621         /* only for stats (print -1 as "%lu" may give unexpected results ;) */
 622         connid = c->c_connid;
 623         close_reason = c->c_close_reason;
 624
 625         ldap_pvt_thread_mutex_lock( &connections_mutex );
 626         c->c_struct_state = SLAP_C_PENDING;
 627         ldap_pvt_thread_mutex_unlock( &connections_mutex );
 628
 629         backend_connection_destroy(c);
 630
 631         c->c_protocol = 0;
 632         c->c_connid = -1;
 633
 634         c->c_activitytime = c->c_starttime = 0;
 635
 636         connection2anonymous( c );
 637         c->c_listener = NULL;
 638
 639         if(c->c_peer_domain.bv_val != NULL) {
 640                 free(c->c_peer_domain.bv_val);
 641         }
 642         BER_BVZERO( &c->c_peer_domain );
 643         if(c->c_peer_name.bv_val != NULL) {
 644                 free(c->c_peer_name.bv_val);
 645         }
 646         BER_BVZERO( &c->c_peer_name );
 647
 648         c->c_sasl_bind_in_progress = 0;
 649         if(c->c_sasl_bind_mech.bv_val != NULL) {
 650                 free(c->c_sasl_bind_mech.bv_val);
 651         }
 652         BER_BVZERO( &c->c_sasl_bind_mech );
 653
 654         slap_sasl_close( c );
 655
 656         if ( c->c_currentber != NULL ) {
 657                 ber_free( c->c_currentber, 1 );
 658                 c->c_currentber = NULL;
 659         }
 660
 661
 662 #ifdef LDAP_SLAPI
 663         /* call destructors, then constructors; avoids unnecessary allocation */
 664         if ( slapi_plugins_used ) {
 665                 slapi_int_clear_object_extensions( SLAPI_X_EXT_CONNECTION, c );
 666         }
 667 #endif
 668
 669         sd = c->c_sd;
 670         c->c_sd = AC_SOCKET_INVALID;
 671         c->c_conn_state = SLAP_C_INVALID;
 672         c->c_struct_state = SLAP_C_UNUSED;
 673         c->c_close_reason = "?";                        /* should never be needed */
 674
 675         sb = c->c_sb;
 676         c->c_sb = ber_sockbuf_alloc( );
 677         {
 678                 ber_len_t max = sockbuf_max_incoming;
 679                 ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_SET_MAX_INCOMING, &max );
 680         }
 681
 682         /* c must be fully reset by this point; when we call slapd_remove
 683          * it may get immediately reused by a new connection.
 684          */
 685         if ( sd != AC_SOCKET_INVALID ) {
 686                 slapd_remove( sd, sb, 1, 0, 0 );
 687
 688                 if ( close_reason == NULL ) {
 689                         Statslog( LDAP_DEBUG_STATS, "conn=%lu fd=%ld closed\n",
 690                                 connid, (long) sd, 0, 0, 0 );
 691                 } else {
 692                         Statslog( LDAP_DEBUG_STATS, "conn=%lu fd=%ld closed (%s)\n",
 693                                 connid, (long) sd, close_reason, 0, 0 );
 694                 }
 695         }
 696 }
 697
 698 int connection_state_closing( Connection *c )
 699 {
 700         /* c_mutex must be locked by caller */
 701
 702         int state;
 703         assert( c != NULL );
 704         assert( c->c_struct_state == SLAP_C_USED );
 705
 706         state = c->c_conn_state;
 707
 708         assert( state != SLAP_C_INVALID );
 709
 710         return state == SLAP_C_CLOSING;
 711 }
 712
 713 static void connection_abandon( Connection *c )
 714 {
 715         /* c_mutex must be locked by caller */
 716
 717         Operation *o, *next, op = {0};
 718         Opheader ohdr = {0};
 719         SlapReply rs = {0};
 720
 721         op.o_hdr = &ohdr;
 722         op.o_conn = c;
 723         op.o_connid = c->c_connid;
 724         op.o_tag = LDAP_REQ_ABANDON;
 725
 726         for ( o = LDAP_STAILQ_FIRST( &c->c_ops ); o; o=next ) {
 727                 next = LDAP_STAILQ_NEXT( o, o_next );
 728                 op.orn_msgid = o->o_msgid;
 729                 o->o_abandon = 1;
 730                 op.o_bd = frontendDB;
 731                 frontendDB->be_abandon( &op, &rs );
 732         }
 733
 734 #ifdef LDAP_X_TXN
 735         /* remove operations in pending transaction */
 736         while ( (o = LDAP_STAILQ_FIRST( &c->c_txn_ops )) != NULL) {
 737                 LDAP_STAILQ_REMOVE_HEAD( &c->c_txn_ops, o_next );
 738                 LDAP_STAILQ_NEXT(o, o_next) = NULL;
 739                 slap_op_free( o, NULL );
 740         }
 741
 742         /* clear transaction */
 743         c->c_txn_backend = NULL;
 744         c->c_txn = CONN_TXN_INACTIVE;
 745 #endif
 746
 747         /* remove pending operations */
 748         while ( (o = LDAP_STAILQ_FIRST( &c->c_pending_ops )) != NULL) {
 749                 LDAP_STAILQ_REMOVE_HEAD( &c->c_pending_ops, o_next );
 750                 LDAP_STAILQ_NEXT(o, o_next) = NULL;
 751                 slap_op_free( o, NULL );
 752         }
 753 }
 754
 755 void connection_closing( Connection *c, const char *why )
 756 {
 757         assert( connections != NULL );
 758         assert( c != NULL );
 759         assert( c->c_struct_state == SLAP_C_USED );
 760         assert( c->c_conn_state != SLAP_C_INVALID );
 761
 762         /* c_mutex must be locked by caller */
 763
 764         if( c->c_conn_state != SLAP_C_CLOSING ) {
 765                 Debug( LDAP_DEBUG_CONNS,
 766                         "connection_closing: readying conn=%lu sd=%d for close\n",
 767                         c->c_connid, c->c_sd, 0 );
 768                 /* update state to closing */
 769                 c->c_conn_state = SLAP_C_CLOSING;
 770                 c->c_close_reason = why;
 771
 772                 /* don't listen on this port anymore */
 773                 slapd_clr_read( c->c_sd, 0 );
 774
 775                 /* abandon active operations */
 776                 connection_abandon( c );
 777
 778                 /* wake write blocked operations */
 779                 ldap_pvt_thread_mutex_lock( &c->c_write1_mutex );
 780                 if ( c->c_writers > 0 ) {
 781                         c->c_writers = -c->c_writers;
 782                         ldap_pvt_thread_cond_broadcast( &c->c_write1_cv );
 783                         ldap_pvt_thread_mutex_unlock( &c->c_write1_mutex );
 784                         if ( c->c_writewaiter ) {
 785                                 ldap_pvt_thread_mutex_lock( &c->c_write2_mutex );
 786                                 ldap_pvt_thread_cond_signal( &c->c_write2_cv );
 787                                 slapd_clr_write( c->c_sd, 1 );
 788                                 ldap_pvt_thread_mutex_unlock( &c->c_write2_mutex );
 789                         }
 790                         ldap_pvt_thread_mutex_lock( &c->c_write1_mutex );
 791                         while ( c->c_writers ) {
 792                                 ldap_pvt_thread_cond_wait( &c->c_write1_cv, &c->c_write1_mutex );
 793                         }
 794                         ldap_pvt_thread_mutex_unlock( &c->c_write1_mutex );
 795                 } else {
 796                         ldap_pvt_thread_mutex_unlock( &c->c_write1_mutex );
 797                         slapd_clr_write( c->c_sd, 1 );
 798                 }
 799
 800         } else if( why == NULL && c->c_close_reason == conn_lost_str ) {
 801                 /* Client closed connection after doing Unbind. */
 802                 c->c_close_reason = NULL;
 803         }
 804 }
 805
 806 static void
 807 connection_close( Connection *c )
 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_CLOSING );
 813
 814         /* NOTE: c_mutex should be locked by caller */
 815
 816         if ( !LDAP_STAILQ_EMPTY(&c->c_ops) ||
 817                 !LDAP_STAILQ_EMPTY(&c->c_pending_ops) )
 818         {
 819                 Debug( LDAP_DEBUG_CONNS,
 820                         "connection_close: deferring conn=%lu sd=%d\n",
 821                         c->c_connid, c->c_sd, 0 );
 822                 return;
 823         }
 824
 825         Debug( LDAP_DEBUG_TRACE, "connection_close: conn=%lu sd=%d\n",
 826                 c->c_connid, c->c_sd, 0 );
 827
 828         connection_destroy( c );
 829 }
 830
 831 unsigned long connections_nextid(void)
 832 {
 833         unsigned long id;
 834         assert( connections != NULL );
 835
 836         ldap_pvt_thread_mutex_lock( &conn_nextid_mutex );
 837
 838         id = conn_nextid;
 839
 840         ldap_pvt_thread_mutex_unlock( &conn_nextid_mutex );
 841
 842         return id;
 843 }
 844
 845 Connection* connection_first( ber_socket_t *index )
 846 {
 847         assert( connections != NULL );
 848         assert( index != NULL );
 849
 850         ldap_pvt_thread_mutex_lock( &connections_mutex );
 851         for( *index = 0; *index < dtblsize; (*index)++) {
 852                 if( connections[*index].c_struct_state != SLAP_C_UNINITIALIZED ) {
 853                         break;
 854                 }
 855         }
 856         ldap_pvt_thread_mutex_unlock( &connections_mutex );
 857
 858         return connection_next(NULL, index);
 859 }
 860
 861 Connection* connection_next( Connection *c, ber_socket_t *index )
 862 {
 863         assert( connections != NULL );
 864         assert( index != NULL );
 865         assert( *index <= dtblsize );
 866
 867         if( c != NULL ) ldap_pvt_thread_mutex_unlock( &c->c_mutex );
 868
 869         c = NULL;
 870
 871         ldap_pvt_thread_mutex_lock( &connections_mutex );
 872         for(; *index < dtblsize; (*index)++) {
 873                 int c_struct;
 874                 if( connections[*index].c_struct_state == SLAP_C_UNINITIALIZED ) {
 875                         /* FIXME: accessing c_conn_state without locking c_mutex */
 876                         assert( connections[*index].c_conn_state == SLAP_C_INVALID );
 877                         continue;
 878                 }
 879
 880                 if( connections[*index].c_struct_state == SLAP_C_USED ) {
 881                         c = &connections[(*index)++];
 882                         if ( ldap_pvt_thread_mutex_trylock( &c->c_mutex )) {
 883                                 /* avoid deadlock */
 884                                 ldap_pvt_thread_mutex_unlock( &connections_mutex );
 885                                 ldap_pvt_thread_mutex_lock( &c->c_mutex );
 886                                 ldap_pvt_thread_mutex_lock( &connections_mutex );
 887                                 if ( c->c_struct_state != SLAP_C_USED ) {
 888                                         ldap_pvt_thread_mutex_unlock( &c->c_mutex );
 889                                         c = NULL;
 890                                         continue;
 891                                 }
 892                         }
 893                         assert( c->c_conn_state != SLAP_C_INVALID );
 894                         break;
 895                 }
 896
 897                 c_struct = connections[*index].c_struct_state;
 898                 if ( c_struct == SLAP_C_PENDING )
 899                         continue;
 900                 assert( c_struct == SLAP_C_UNUSED );
 901                 /* FIXME: accessing c_conn_state without locking c_mutex */
 902                 assert( connections[*index].c_conn_state == SLAP_C_INVALID );
 903         }
 904
 905         ldap_pvt_thread_mutex_unlock( &connections_mutex );
 906         return c;
 907 }
 908
 909 void connection_done( Connection *c )
 910 {
 911         assert( connections != NULL );
 912
 913         if( c != NULL ) ldap_pvt_thread_mutex_unlock( &c->c_mutex );
 914 }
 915
 916 /*
 917  * connection_activity - handle the request operation op on connection
 918  * conn.  This routine figures out what kind of operation it is and
 919  * calls the appropriate stub to handle it.
 920  */
 921
 922 #ifdef SLAPD_MONITOR
 923 /* FIXME: returns 0 in case of failure */
 924 #define INCR_OP_INITIATED(index) \
 925         do { \
 926                 ldap_pvt_thread_mutex_lock( &op->o_counters->sc_mutex ); \
 927                 ldap_pvt_mp_add_ulong(op->o_counters->sc_ops_initiated_[(index)], 1); \
 928                 ldap_pvt_thread_mutex_unlock( &op->o_counters->sc_mutex ); \
 929         } while (0)
 930 #define INCR_OP_COMPLETED(index) \
 931         do { \
 932                 ldap_pvt_thread_mutex_lock( &op->o_counters->sc_mutex ); \
 933                 ldap_pvt_mp_add_ulong(op->o_counters->sc_ops_completed, 1); \
 934                 ldap_pvt_mp_add_ulong(op->o_counters->sc_ops_completed_[(index)], 1); \
 935                 ldap_pvt_thread_mutex_unlock( &op->o_counters->sc_mutex ); \
 936         } while (0)
 937 #else /* !SLAPD_MONITOR */
 938 #define INCR_OP_INITIATED(index) do { } while (0)
 939 #define INCR_OP_COMPLETED(index) \
 940         do { \
 941                 ldap_pvt_thread_mutex_lock( &op->o_counters->sc_mutex ); \
 942                 ldap_pvt_mp_add_ulong(op->o_counters->sc_ops_completed, 1); \
 943                 ldap_pvt_thread_mutex_unlock( &op->o_counters->sc_mutex ); \
 944         } while (0)
 945 #endif /* !SLAPD_MONITOR */
 946
 947 /*
 948  * NOTE: keep in sync with enum in slapd.h
 949  */
 950 static BI_op_func *opfun[] = {
 951         do_bind,
 952         do_unbind,
 953         do_search,
 954         do_compare,
 955         do_modify,
 956         do_modrdn,
 957         do_add,
 958         do_delete,
 959         do_abandon,
 960         do_extended,
 961         NULL
 962 };
 963
 964 /* Counters are per-thread, not per-connection.
 965  */
 966 static void
 967 conn_counter_destroy( void *key, void *data )
 968 {
 969         slap_counters_t **prev, *sc;
 970
 971         ldap_pvt_thread_mutex_lock( &slap_counters.sc_mutex );
 972         for ( prev = &slap_counters.sc_next, sc = slap_counters.sc_next; sc;
 973                 prev = &sc->sc_next, sc = sc->sc_next ) {
 974                 if ( sc == data ) {
 975                         int i;
 976
 977                         *prev = sc->sc_next;
 978                         /* Copy data to main counter */
 979                         ldap_pvt_mp_add( slap_counters.sc_bytes, sc->sc_bytes );
 980                         ldap_pvt_mp_add( slap_counters.sc_pdu, sc->sc_pdu );
 981                         ldap_pvt_mp_add( slap_counters.sc_entries, sc->sc_entries );
 982                         ldap_pvt_mp_add( slap_counters.sc_refs, sc->sc_refs );
 983                         ldap_pvt_mp_add( slap_counters.sc_ops_initiated, sc->sc_ops_initiated );
 984                         ldap_pvt_mp_add( slap_counters.sc_ops_completed, sc->sc_ops_completed );
 985 #ifdef SLAPD_MONITOR
 986                         for ( i = 0; i < SLAP_OP_LAST; i++ ) {
 987                                 ldap_pvt_mp_add( slap_counters.sc_ops_initiated_[ i ], sc->sc_ops_initiated_[ i ] );
 988                                 ldap_pvt_mp_add( slap_counters.sc_ops_initiated_[ i ], sc->sc_ops_completed_[ i ] );
 989                         }
 990 #endif /* SLAPD_MONITOR */
 991                         slap_counters_destroy( sc );
 992                         ber_memfree_x( data, NULL );
 993                         break;
 994                 }
 995         }
 996         ldap_pvt_thread_mutex_unlock( &slap_counters.sc_mutex );
 997 }
 998
 999 static void
1000 conn_counter_init( Operation *op, void *ctx )
1001 {
1002         slap_counters_t *sc;
1003         void *vsc = NULL;
1004
1005         if ( ldap_pvt_thread_pool_getkey(
1006                         ctx, (void *)conn_counter_init, &vsc, NULL ) || !vsc ) {
1007                 vsc = ch_malloc( sizeof( slap_counters_t ));
1008                 sc = vsc;
1009                 slap_counters_init( sc );
1010                 ldap_pvt_thread_pool_setkey( ctx, (void*)conn_counter_init, vsc,
1011                         conn_counter_destroy, NULL, NULL );
1012
1013                 ldap_pvt_thread_mutex_lock( &slap_counters.sc_mutex );
1014                 sc->sc_next = slap_counters.sc_next;
1015                 slap_counters.sc_next = sc;
1016                 ldap_pvt_thread_mutex_unlock( &slap_counters.sc_mutex );
1017         }
1018         op->o_counters = vsc;
1019 }
1020
1021 static void *
1022 connection_operation( void *ctx, void *arg_v )
1023 {
1024         int rc = LDAP_OTHER;
1025         Operation *op = arg_v;
1026         SlapReply rs = {REP_RESULT};
1027         ber_tag_t tag = op->o_tag;
1028         slap_op_t opidx = SLAP_OP_LAST;
1029         Connection *conn = op->o_conn;
1030         void *memctx = NULL;
1031         void *memctx_null = NULL;
1032         ber_len_t memsiz;
1033
1034         conn_counter_init( op, ctx );
1035         ldap_pvt_thread_mutex_lock( &op->o_counters->sc_mutex );
1036         /* FIXME: returns 0 in case of failure */
1037         ldap_pvt_mp_add_ulong(op->o_counters->sc_ops_initiated, 1);
1038         ldap_pvt_thread_mutex_unlock( &op->o_counters->sc_mutex );
1039
1040         op->o_threadctx = ctx;
1041         op->o_tid = ldap_pvt_thread_pool_tid( ctx );
1042
1043         switch ( tag ) {
1044         case LDAP_REQ_BIND:
1045         case LDAP_REQ_UNBIND:
1046         case LDAP_REQ_ADD:
1047         case LDAP_REQ_DELETE:
1048         case LDAP_REQ_MODDN:
1049         case LDAP_REQ_MODIFY:
1050         case LDAP_REQ_COMPARE:
1051         case LDAP_REQ_SEARCH:
1052         case LDAP_REQ_ABANDON:
1053         case LDAP_REQ_EXTENDED:
1054                 break;
1055         default:
1056                 Debug( LDAP_DEBUG_ANY, "connection_operation: "
1057                         "conn %lu unknown LDAP request 0x%lx\n",
1058                         conn->c_connid, tag, 0 );
1059                 op->o_tag = LBER_ERROR;
1060                 rs.sr_err = LDAP_PROTOCOL_ERROR;
1061                 rs.sr_text = "unknown LDAP request";
1062                 send_ldap_disconnect( op, &rs );
1063                 rc = SLAPD_DISCONNECT;
1064                 goto operations_error;
1065         }
1066
1067         if( conn->c_sasl_bind_in_progress && tag != LDAP_REQ_BIND ) {
1068                 Debug( LDAP_DEBUG_ANY, "connection_operation: "
1069                         "error: SASL bind in progress (tag=%ld).\n",
1070                         (long) tag, 0, 0 );
1071                 send_ldap_error( op, &rs, LDAP_OPERATIONS_ERROR,
1072                         "SASL bind in progress" );
1073                 rc = LDAP_OPERATIONS_ERROR;
1074                 goto operations_error;
1075         }
1076
1077 #ifdef LDAP_X_TXN
1078         if (( conn->c_txn == CONN_TXN_SPECIFY ) && (
1079                 ( tag == LDAP_REQ_ADD ) ||
1080                 ( tag == LDAP_REQ_DELETE ) ||
1081                 ( tag == LDAP_REQ_MODIFY ) ||
1082                 ( tag == LDAP_REQ_MODRDN )))
1083         {
1084                 /* Disable SLAB allocator for all update operations
1085                         issued inside of a transaction */
1086                 op->o_tmpmemctx = NULL;
1087                 op->o_tmpmfuncs = &ch_mfuncs;
1088         } else
1089 #endif
1090         {
1091         /* We can use Thread-Local storage for most mallocs. We can
1092          * also use TL for ber parsing, but not on Add or Modify.
1093          */
1094 #if 0
1095         memsiz = ber_len( op->o_ber ) * 64;
1096         if ( SLAP_SLAB_SIZE > memsiz ) memsiz = SLAP_SLAB_SIZE;
1097 #endif
1098         memsiz = SLAP_SLAB_SIZE;
1099
1100         memctx = slap_sl_mem_create( memsiz, SLAP_SLAB_STACK, ctx, 1 );
1101         op->o_tmpmemctx = memctx;
1102         op->o_tmpmfuncs = &slap_sl_mfuncs;
1103         if ( tag != LDAP_REQ_ADD && tag != LDAP_REQ_MODIFY ) {
1104                 /* Note - the ber and its buffer are already allocated from
1105                  * regular memory; this only affects subsequent mallocs that
1106                  * ber_scanf may invoke.
1107                  */
1108                 ber_set_option( op->o_ber, LBER_OPT_BER_MEMCTX, &memctx );
1109         }
1110         }
1111
1112         opidx = slap_req2op( tag );
1113         assert( opidx != SLAP_OP_LAST );
1114         INCR_OP_INITIATED( opidx );
1115         rc = (*(opfun[opidx]))( op, &rs );
1116
1117 operations_error:
1118         if ( rc == SLAPD_DISCONNECT ) {
1119                 tag = LBER_ERROR;
1120
1121         } else if ( opidx != SLAP_OP_LAST ) {
1122                 /* increment completed operations count
1123                  * only if operation was initiated
1124                  * and rc != SLAPD_DISCONNECT */
1125                 INCR_OP_COMPLETED( opidx );
1126         }
1127
1128         if ( op->o_cancel == SLAP_CANCEL_REQ ) {
1129                 if ( rc == SLAPD_ABANDON ) {
1130                         op->o_cancel = SLAP_CANCEL_ACK;
1131                 } else {
1132                         op->o_cancel = LDAP_TOO_LATE;
1133                 }
1134         }
1135
1136         while ( op->o_cancel != SLAP_CANCEL_NONE &&
1137                 op->o_cancel != SLAP_CANCEL_DONE )
1138         {
1139                 ldap_pvt_thread_yield();
1140         }
1141
1142         ldap_pvt_thread_mutex_lock( &conn->c_mutex );
1143
1144         ber_set_option( op->o_ber, LBER_OPT_BER_MEMCTX, &memctx_null );
1145
1146         LDAP_STAILQ_REMOVE( &conn->c_ops, op, Operation, o_next);
1147         LDAP_STAILQ_NEXT(op, o_next) = NULL;
1148         conn->c_n_ops_executing--;
1149         conn->c_n_ops_completed++;
1150
1151         switch( tag ) {
1152         case LBER_ERROR:
1153         case LDAP_REQ_UNBIND:
1154                 /* c_mutex is locked */
1155                 connection_closing( conn,
1156                         tag == LDAP_REQ_UNBIND ? NULL : "operations error" );
1157                 break;
1158         }
1159
1160         connection_resched( conn );
1161         ldap_pvt_thread_mutex_unlock( &conn->c_mutex );
1162         slap_op_free( op, ctx );
1163         return NULL;
1164 }
1165
1166 static const Listener dummy_list = { BER_BVC(""), BER_BVC("") };
1167
1168 Connection *connection_client_setup(
1169         ber_socket_t s,
1170         ldap_pvt_thread_start_t *func,
1171         void *arg )
1172 {
1173         Connection *c;
1174         ber_socket_t sfd = SLAP_SOCKNEW( s );
1175
1176         c = connection_init( sfd, (Listener *)&dummy_list, "", "",
1177                 CONN_IS_CLIENT, 0, NULL
1178                 LDAP_PF_LOCAL_SENDMSG_ARG(NULL));
1179         if ( c ) {
1180                 c->c_clientfunc = func;
1181                 c->c_clientarg = arg;
1182
1183                 slapd_add_internal( sfd, 0 );
1184         }
1185         return c;
1186 }
1187
1188 void connection_client_enable(
1189         Connection *c )
1190 {
1191         slapd_set_read( c->c_sd, 1 );
1192 }
1193
1194 void connection_client_stop(
1195         Connection *c )
1196 {
1197         Sockbuf *sb;
1198         ber_socket_t s = c->c_sd;
1199
1200         /* get (locked) connection */
1201         c = connection_get( s );
1202
1203         assert( c->c_conn_state == SLAP_C_CLIENT );
1204
1205         c->c_listener = NULL;
1206         c->c_conn_state = SLAP_C_INVALID;
1207         c->c_struct_state = SLAP_C_UNUSED;
1208         c->c_sd = AC_SOCKET_INVALID;
1209         c->c_close_reason = "?";                        /* should never be needed */
1210         sb = c->c_sb;
1211         c->c_sb = ber_sockbuf_alloc( );
1212         {
1213                 ber_len_t max = sockbuf_max_incoming;
1214                 ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_SET_MAX_INCOMING, &max );
1215         }
1216         slapd_remove( s, sb, 0, 1, 0 );
1217
1218         connection_return( c );
1219 }
1220
1221 static int connection_read( ber_socket_t s, conn_readinfo *cri );
1222
1223 static void* connection_read_thread( void* ctx, void* argv )
1224 {
1225         int rc ;
1226         conn_readinfo cri = { NULL, NULL, NULL, NULL, 0 };
1227         ber_socket_t s = (long)argv;
1228
1229         /*
1230          * read incoming LDAP requests. If there is more than one,
1231          * the first one is returned with new_op
1232          */
1233         cri.ctx = ctx;
1234         if( ( rc = connection_read( s, &cri ) ) < 0 ) {
1235                 Debug( LDAP_DEBUG_CONNS, "connection_read(%d) error\n", s, 0, 0 );
1236                 return (void*)(long)rc;
1237         }
1238
1239         /* execute a single queued request in the same thread */
1240         if( cri.op && !cri.nullop ) {
1241                 rc = (long)connection_operation( ctx, cri.op );
1242         } else if ( cri.func ) {
1243                 rc = (long)cri.func( ctx, cri.arg );
1244         }
1245
1246         return (void*)(long)rc;
1247 }
1248
1249 int connection_read_activate( ber_socket_t s )
1250 {
1251         int rc;
1252
1253         /*
1254          * suspend reading on this file descriptor until a connection processing
1255          * thread reads data on it. Otherwise the listener thread will repeatedly
1256          * submit the same event on it to the pool.
1257          */
1258         rc = slapd_clr_read( s, 0 );
1259         if ( rc )
1260                 return rc;
1261
1262         rc = ldap_pvt_thread_pool_submit( &connection_pool,
1263                 connection_read_thread, (void *)(long)s );
1264
1265         if( rc != 0 ) {
1266                 Debug( LDAP_DEBUG_ANY,
1267                         "connection_read_activate(%d): submit failed (%d)\n",
1268                         s, rc, 0 );
1269         }
1270
1271         return rc;
1272 }
1273
1274 void
1275 connection_hangup( ber_socket_t s )
1276 {
1277         Connection *c;
1278
1279         c = connection_get( s );
1280         if ( c ) {
1281                 if ( c->c_conn_state == SLAP_C_CLIENT ) {
1282                         connection_return( c );
1283                         connection_read_activate( s );
1284                 } else {
1285                         connection_closing( c, "connection lost" );
1286                         connection_close( c );
1287                         connection_return( c );
1288                 }
1289         }
1290 }
1291
1292 static int
1293 connection_read( ber_socket_t s, conn_readinfo *cri )
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_CONNS,
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                 cri->func = c->c_clientfunc;
1323                 cri->arg = c->c_clientarg;
1324                 /* read should already be cleared */
1325                 connection_return( c );
1326                 return 0;
1327         }
1328
1329         Debug( LDAP_DEBUG_TRACE,
1330                 "connection_read(%d): checking for input on id=%lu\n",
1331                 s, c->c_connid, 0 );
1332
1333 #ifdef HAVE_TLS
1334         if ( c->c_is_tls && c->c_needs_tls_accept ) {
1335                 rc = ldap_pvt_tls_accept( c->c_sb, slap_tls_ctx );
1336                 if ( rc < 0 ) {
1337                         Debug( LDAP_DEBUG_TRACE,
1338                                 "connection_read(%d): TLS accept failure "
1339                                 "error=%d id=%lu, closing\n",
1340                                 s, rc, c->c_connid );
1341
1342                         c->c_needs_tls_accept = 0;
1343                         /* c_mutex is locked */
1344                         connection_closing( c, "TLS negotiation failure" );
1345                         connection_close( c );
1346                         connection_return( c );
1347                         return 0;
1348
1349                 } else if ( rc == 0 ) {
1350                         void *ssl;
1351                         struct berval authid = BER_BVNULL;
1352
1353                         c->c_needs_tls_accept = 0;
1354
1355                         /* we need to let SASL know */
1356                         ssl = ldap_pvt_tls_sb_ctx( c->c_sb );
1357
1358                         c->c_tls_ssf = (slap_ssf_t) ldap_pvt_tls_get_strength( ssl );
1359                         if( c->c_tls_ssf > c->c_ssf ) {
1360                                 c->c_ssf = c->c_tls_ssf;
1361                         }
1362
1363                         rc = dnX509peerNormalize( ssl, &authid );
1364                         if ( rc != LDAP_SUCCESS ) {
1365                                 Debug( LDAP_DEBUG_TRACE, "connection_read(%d): "
1366                                         "unable to get TLS client DN, error=%d id=%lu\n",
1367                                         s, rc, c->c_connid );
1368                         }
1369                         Statslog( LDAP_DEBUG_STATS,
1370                                 "conn=%lu fd=%d TLS established tls_ssf=%u ssf=%u\n",
1371                             c->c_connid, (int) s, c->c_tls_ssf, c->c_ssf, 0 );
1372                         slap_sasl_external( c, c->c_tls_ssf, &authid );
1373                         if ( authid.bv_val ) free( authid.bv_val );
1374                 }
1375
1376                 /* if success and data is ready, fall thru to data input loop */
1377                 if( !ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_DATA_READY, NULL ) )
1378                 {
1379                         slapd_set_read( s, 1 );
1380                         connection_return( c );
1381                         return 0;
1382                 }
1383         }
1384 #endif
1385
1386 #ifdef HAVE_CYRUS_SASL
1387         if ( c->c_sasl_layers ) {
1388                 /* If previous layer is not removed yet, give up for now */
1389                 if ( !c->c_sasl_sockctx ) {
1390                         slapd_set_read( s, 1 );
1391                         connection_return( c );
1392                         return 0;
1393                 }
1394
1395                 c->c_sasl_layers = 0;
1396
1397                 rc = ldap_pvt_sasl_install( c->c_sb, c->c_sasl_sockctx );
1398                 if( rc != LDAP_SUCCESS ) {
1399                         Debug( LDAP_DEBUG_TRACE,
1400                                 "connection_read(%d): SASL install error "
1401                                 "error=%d id=%lu, closing\n",
1402                                 s, rc, c->c_connid );
1403
1404                         /* c_mutex is locked */
1405                         connection_closing( c, "SASL layer install failure" );
1406                         connection_close( c );
1407                         connection_return( c );
1408                         return 0;
1409                 }
1410         }
1411 #endif
1412
1413 #define CONNECTION_INPUT_LOOP 1
1414 /* #define      DATA_READY_LOOP 1 */
1415
1416         do {
1417                 /* How do we do this without getting into a busy loop ? */
1418                 rc = connection_input( c, cri );
1419         }
1420 #ifdef DATA_READY_LOOP
1421         while( !rc && ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_DATA_READY, NULL ));
1422 #elif defined CONNECTION_INPUT_LOOP
1423         while(!rc);
1424 #else
1425         while(0);
1426 #endif
1427
1428         if( rc < 0 ) {
1429                 Debug( LDAP_DEBUG_CONNS,
1430                         "connection_read(%d): input error=%d id=%lu, closing.\n",
1431                         s, rc, c->c_connid );
1432
1433                 /* c_mutex is locked */
1434                 connection_closing( c, conn_lost_str );
1435                 connection_close( c );
1436                 connection_return( c );
1437                 return 0;
1438         }
1439
1440         if ( ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_NEEDS_WRITE, NULL ) ) {
1441                 slapd_set_write( s, 0 );
1442         }
1443
1444         slapd_set_read( s, 1 );
1445         connection_return( c );
1446
1447         return 0;
1448 }
1449
1450 static int
1451 connection_input( Connection *conn , conn_readinfo *cri )
1452 {
1453         Operation *op;
1454         ber_tag_t       tag;
1455         ber_len_t       len;
1456         ber_int_t       msgid;
1457         BerElement      *ber;
1458         int             rc;
1459 #ifdef LDAP_CONNECTIONLESS
1460         Sockaddr        peeraddr;
1461         char            *cdn = NULL;
1462 #endif
1463         char *defer = NULL;
1464         void *ctx;
1465
1466         if ( conn->c_currentber == NULL &&
1467                 ( conn->c_currentber = ber_alloc()) == NULL )
1468         {
1469                 Debug( LDAP_DEBUG_ANY, "ber_alloc failed\n", 0, 0, 0 );
1470                 return -1;
1471         }
1472
1473         sock_errset(0);
1474
1475 #ifdef LDAP_CONNECTIONLESS
1476         if ( conn->c_is_udp ) {
1477                 char peername[sizeof("IP=255.255.255.255:65336")];
1478
1479                 len = ber_int_sb_read(conn->c_sb, &peeraddr, sizeof(struct sockaddr));
1480                 if (len != sizeof(struct sockaddr)) return 1;
1481
1482                 sprintf( peername, "IP=%s:%d",
1483                         inet_ntoa( peeraddr.sa_in_addr.sin_addr ),
1484                         (unsigned) ntohs( peeraddr.sa_in_addr.sin_port ) );
1485                 Statslog( LDAP_DEBUG_STATS,
1486                         "conn=%lu UDP request from %s (%s) accepted.\n",
1487                         conn->c_connid, peername, conn->c_sock_name.bv_val, 0, 0 );
1488         }
1489 #endif
1490
1491         tag = ber_get_next( conn->c_sb, &len, conn->c_currentber );
1492         if ( tag != LDAP_TAG_MESSAGE ) {
1493                 int err = sock_errno();
1494
1495                 if ( err != EWOULDBLOCK && err != EAGAIN ) {
1496                         /* log, close and send error */
1497                         Debug( LDAP_DEBUG_TRACE,
1498                                 "ber_get_next on fd %d failed errno=%d (%s)\n",
1499                         conn->c_sd, err, sock_errstr(err) );
1500                         ber_free( conn->c_currentber, 1 );
1501                         conn->c_currentber = NULL;
1502
1503                         return -2;
1504                 }
1505                 return 1;
1506         }
1507
1508         ber = conn->c_currentber;
1509         conn->c_currentber = NULL;
1510
1511         if ( (tag = ber_get_int( ber, &msgid )) != LDAP_TAG_MSGID ) {
1512                 /* log, close and send error */
1513                 Debug( LDAP_DEBUG_ANY, "ber_get_int returns 0x%lx\n", tag, 0, 0 );
1514                 ber_free( ber, 1 );
1515                 return -1;
1516         }
1517
1518         if ( (tag = ber_peek_tag( ber, &len )) == LBER_ERROR ) {
1519                 /* log, close and send error */
1520                 Debug( LDAP_DEBUG_ANY, "ber_peek_tag returns 0x%lx\n", tag, 0, 0 );
1521                 ber_free( ber, 1 );
1522
1523                 return -1;
1524         }
1525
1526 #ifdef LDAP_CONNECTIONLESS
1527         if( conn->c_is_udp ) {
1528                 if( tag == LBER_OCTETSTRING ) {
1529                         ber_get_stringa( ber, &cdn );
1530                         tag = ber_peek_tag(ber, &len);
1531                 }
1532                 if( tag != LDAP_REQ_ABANDON && tag != LDAP_REQ_SEARCH ) {
1533                         Debug( LDAP_DEBUG_ANY, "invalid req for UDP 0x%lx\n", tag, 0, 0 );
1534                         ber_free( ber, 1 );
1535                         return 0;
1536                 }
1537         }
1538 #endif
1539
1540         if(tag == LDAP_REQ_BIND) {
1541                 /* immediately abandon all existing operations upon BIND */
1542                 connection_abandon( conn );
1543         }
1544
1545         ctx = cri->ctx;
1546         op = slap_op_alloc( ber, msgid, tag, conn->c_n_ops_received++, ctx );
1547
1548         op->o_conn = conn;
1549         /* clear state if the connection is being reused from inactive */
1550         if ( conn->c_conn_state == SLAP_C_INACTIVE ) {
1551                 memset( &conn->c_pagedresults_state, 0,
1552                         sizeof( conn->c_pagedresults_state ) );
1553         }
1554
1555         op->o_res_ber = NULL;
1556
1557 #ifdef LDAP_CONNECTIONLESS
1558         if (conn->c_is_udp) {
1559                 if ( cdn ) {
1560                         ber_str2bv( cdn, 0, 1, &op->o_dn );
1561                         op->o_protocol = LDAP_VERSION2;
1562                 }
1563                 op->o_res_ber = ber_alloc_t( LBER_USE_DER );
1564                 if (op->o_res_ber == NULL) return 1;
1565
1566                 rc = ber_write( op->o_res_ber, (char *)&peeraddr,
1567                         sizeof(struct sockaddr), 0 );
1568
1569                 if (rc != sizeof(struct sockaddr)) {
1570                         Debug( LDAP_DEBUG_ANY, "ber_write failed\n", 0, 0, 0 );
1571                         return 1;
1572                 }
1573
1574                 if (op->o_protocol == LDAP_VERSION2) {
1575                         rc = ber_printf(op->o_res_ber, "{is{" /*}}*/, op->o_msgid, "");
1576                         if (rc == -1) {
1577                                 Debug( LDAP_DEBUG_ANY, "ber_write failed\n", 0, 0, 0 );
1578                                 return rc;
1579                         }
1580                 }
1581         }
1582 #endif /* LDAP_CONNECTIONLESS */
1583
1584         rc = 0;
1585
1586         /* Don't process requests when the conn is in the middle of a
1587          * Bind, or if it's closing. Also, don't let any single conn
1588          * use up all the available threads, and don't execute if we're
1589          * currently blocked on output. And don't execute if there are
1590          * already pending ops, let them go first.  Abandon operations
1591          * get exceptions to some, but not all, cases.
1592          */
1593         switch( tag ){
1594         default:
1595                 /* Abandon and Unbind are exempt from these checks */
1596                 if (conn->c_conn_state == SLAP_C_CLOSING) {
1597                         defer = "closing";
1598                         break;
1599                 } else if (conn->c_writewaiter) {
1600                         defer = "awaiting write";
1601                         break;
1602                 } else if (conn->c_n_ops_pending) {
1603                         defer = "pending operations";
1604                         break;
1605                 }
1606                 /* FALLTHRU */
1607         case LDAP_REQ_ABANDON:
1608                 /* Unbind is exempt from these checks */
1609                 if (conn->c_n_ops_executing >= connection_pool_max/2) {
1610                         defer = "too many executing";
1611                         break;
1612                 } else if (conn->c_conn_state == SLAP_C_BINDING) {
1613                         defer = "binding";
1614                         break;
1615                 }
1616                 /* FALLTHRU */
1617         case LDAP_REQ_UNBIND:
1618                 break;
1619         }
1620
1621         if( defer ) {
1622                 int max = conn->c_dn.bv_len
1623                         ? slap_conn_max_pending_auth
1624                         : slap_conn_max_pending;
1625
1626                 Debug( LDAP_DEBUG_ANY,
1627                         "connection_input: conn=%lu deferring operation: %s\n",
1628                         conn->c_connid, defer, 0 );
1629                 conn->c_n_ops_pending++;
1630                 LDAP_STAILQ_INSERT_TAIL( &conn->c_pending_ops, op, o_next );
1631                 rc = ( conn->c_n_ops_pending > max ) ? -1 : 0;
1632
1633         } else {
1634                 conn->c_n_ops_executing++;
1635
1636                 /*
1637                  * The first op will be processed in the same thread context,
1638                  * as long as there is only one op total.
1639                  * Subsequent ops will be submitted to the pool by
1640                  * calling connection_op_activate()
1641                  */
1642                 if ( cri->op == NULL ) {
1643                         /* the first incoming request */
1644                         connection_op_queue( op );
1645                         cri->op = op;
1646                 } else {
1647                         if ( !cri->nullop ) {
1648                                 cri->nullop = 1;
1649                                 rc = ldap_pvt_thread_pool_submit( &connection_pool,
1650                                         connection_operation, (void *) cri->op );
1651                         }
1652                         connection_op_activate( op );
1653                 }
1654         }
1655
1656 #ifdef NO_THREADS
1657         if ( conn->c_struct_state != SLAP_C_USED ) {
1658                 /* connection must have got closed underneath us */
1659                 return 1;
1660         }
1661 #endif
1662
1663         assert( conn->c_struct_state == SLAP_C_USED );
1664         return rc;
1665 }
1666
1667 static int
1668 connection_resched( Connection *conn )
1669 {
1670         Operation *op;
1671
1672         if( conn->c_writewaiter )
1673                 return 0;
1674
1675         if( conn->c_conn_state == SLAP_C_CLOSING ) {
1676                 Debug( LDAP_DEBUG_CONNS, "connection_resched: "
1677                         "attempting closing conn=%lu sd=%d\n",
1678                         conn->c_connid, conn->c_sd, 0 );
1679                 connection_close( conn );
1680                 return 0;
1681         }
1682
1683         if( conn->c_conn_state != SLAP_C_ACTIVE ) {
1684                 /* other states need different handling */
1685                 return 0;
1686         }
1687
1688         while ((op = LDAP_STAILQ_FIRST( &conn->c_pending_ops )) != NULL) {
1689                 if ( conn->c_n_ops_executing > connection_pool_max/2 ) break;
1690
1691                 LDAP_STAILQ_REMOVE_HEAD( &conn->c_pending_ops, o_next );
1692                 LDAP_STAILQ_NEXT(op, o_next) = NULL;
1693
1694                 /* pending operations should not be marked for abandonment */
1695                 assert(!op->o_abandon);
1696
1697                 conn->c_n_ops_pending--;
1698                 conn->c_n_ops_executing++;
1699
1700                 connection_op_activate( op );
1701
1702                 if ( conn->c_conn_state == SLAP_C_BINDING ) break;
1703         }
1704         return 0;
1705 }
1706
1707 static void
1708 connection_init_log_prefix( Operation *op )
1709 {
1710         if ( op->o_connid == (unsigned long)(-1) ) {
1711                 snprintf( op->o_log_prefix, sizeof( op->o_log_prefix ),
1712                         "conn=-1 op=%lu", op->o_opid );
1713
1714         } else {
1715                 snprintf( op->o_log_prefix, sizeof( op->o_log_prefix ),
1716                         "conn=%lu op=%lu", op->o_connid, op->o_opid );
1717         }
1718 }
1719
1720 static int connection_bind_cleanup_cb( Operation *op, SlapReply *rs )
1721 {
1722         op->o_conn->c_sasl_bindop = NULL;
1723
1724         ch_free( op->o_callback );
1725         op->o_callback = NULL;
1726
1727         return SLAP_CB_CONTINUE;
1728 }
1729
1730 static int connection_bind_cb( Operation *op, SlapReply *rs )
1731 {
1732         ldap_pvt_thread_mutex_lock( &op->o_conn->c_mutex );
1733         if ( op->o_conn->c_conn_state == SLAP_C_BINDING )
1734                 op->o_conn->c_conn_state = SLAP_C_ACTIVE;
1735         op->o_conn->c_sasl_bind_in_progress =
1736                 ( rs->sr_err == LDAP_SASL_BIND_IN_PROGRESS );
1737
1738         /* Moved here from bind.c due to ITS#4158 */
1739         op->o_conn->c_sasl_bindop = NULL;
1740         if ( op->orb_method == LDAP_AUTH_SASL ) {
1741                 if( rs->sr_err == LDAP_SUCCESS ) {
1742                         ber_dupbv(&op->o_conn->c_dn, &op->orb_edn);
1743                         if( !BER_BVISEMPTY( &op->orb_edn ) ) {
1744                                 /* edn is always normalized already */
1745                                 ber_dupbv( &op->o_conn->c_ndn, &op->o_conn->c_dn );
1746                         }
1747                         op->o_tmpfree( op->orb_edn.bv_val, op->o_tmpmemctx );
1748                         BER_BVZERO( &op->orb_edn );
1749                         op->o_conn->c_authmech = op->o_conn->c_sasl_bind_mech;
1750                         BER_BVZERO( &op->o_conn->c_sasl_bind_mech );
1751
1752                         op->o_conn->c_sasl_ssf = op->orb_ssf;
1753                         if( op->orb_ssf > op->o_conn->c_ssf ) {
1754                                 op->o_conn->c_ssf = op->orb_ssf;
1755                         }
1756
1757                         if( !BER_BVISEMPTY( &op->o_conn->c_dn ) ) {
1758                                 ber_len_t max = sockbuf_max_incoming_auth;
1759                                 ber_sockbuf_ctrl( op->o_conn->c_sb,
1760                                         LBER_SB_OPT_SET_MAX_INCOMING, &max );
1761                         }
1762
1763                         /* log authorization identity */
1764                         Statslog( LDAP_DEBUG_STATS,
1765                                 "%s BIND dn=\"%s\" mech=%s sasl_ssf=%d ssf=%d\n",
1766                                 op->o_log_prefix,
1767                                 BER_BVISNULL( &op->o_conn->c_dn ) ? "<empty>" : op->o_conn->c_dn.bv_val,
1768                                 op->o_conn->c_authmech.bv_val,
1769                                 op->orb_ssf, op->o_conn->c_ssf );
1770
1771                         Debug( LDAP_DEBUG_TRACE,
1772                                 "do_bind: SASL/%s bind: dn=\"%s\" sasl_ssf=%d\n",
1773                                 op->o_conn->c_authmech.bv_val,
1774                                 BER_BVISNULL( &op->o_conn->c_dn ) ? "<empty>" : op->o_conn->c_dn.bv_val,
1775                                 op->orb_ssf );
1776
1777                 } else if ( rs->sr_err != LDAP_SASL_BIND_IN_PROGRESS ) {
1778                         if ( !BER_BVISNULL( &op->o_conn->c_sasl_bind_mech ) ) {
1779                                 free( op->o_conn->c_sasl_bind_mech.bv_val );
1780                                 BER_BVZERO( &op->o_conn->c_sasl_bind_mech );
1781                         }
1782                 }
1783         }
1784         ldap_pvt_thread_mutex_unlock( &op->o_conn->c_mutex );
1785
1786         ch_free( op->o_callback );
1787         op->o_callback = NULL;
1788
1789         return SLAP_CB_CONTINUE;
1790 }
1791
1792 static void connection_op_queue( Operation *op )
1793 {
1794         ber_tag_t tag = op->o_tag;
1795
1796         if (tag == LDAP_REQ_BIND) {
1797                 slap_callback *sc = ch_calloc( 1, sizeof( slap_callback ));
1798                 sc->sc_response = connection_bind_cb;
1799                 sc->sc_cleanup = connection_bind_cleanup_cb;
1800                 sc->sc_next = op->o_callback;
1801                 op->o_callback = sc;
1802                 op->o_conn->c_conn_state = SLAP_C_BINDING;
1803         }
1804
1805         if (!op->o_dn.bv_len) {
1806                 op->o_authz = op->o_conn->c_authz;
1807                 if ( BER_BVISNULL( &op->o_conn->c_sasl_authz_dn )) {
1808                         ber_dupbv( &op->o_dn, &op->o_conn->c_dn );
1809                         ber_dupbv( &op->o_ndn, &op->o_conn->c_ndn );
1810                 } else {
1811                         ber_dupbv( &op->o_dn, &op->o_conn->c_sasl_authz_dn );
1812                         ber_dupbv( &op->o_ndn, &op->o_conn->c_sasl_authz_dn );
1813                 }
1814         }
1815
1816         op->o_authtype = op->o_conn->c_authtype;
1817         ber_dupbv( &op->o_authmech, &op->o_conn->c_authmech );
1818
1819         if (!op->o_protocol) {
1820                 op->o_protocol = op->o_conn->c_protocol
1821                         ? op->o_conn->c_protocol : LDAP_VERSION3;
1822         }
1823
1824         if (op->o_conn->c_conn_state == SLAP_C_INACTIVE &&
1825                 op->o_protocol > LDAP_VERSION2)
1826         {
1827                 op->o_conn->c_conn_state = SLAP_C_ACTIVE;
1828         }
1829
1830         op->o_connid = op->o_conn->c_connid;
1831         connection_init_log_prefix( op );
1832
1833         LDAP_STAILQ_INSERT_TAIL( &op->o_conn->c_ops, op, o_next );
1834 }
1835
1836 static int connection_op_activate( Operation *op )
1837 {
1838         int rc;
1839
1840         connection_op_queue( op );
1841
1842         rc = ldap_pvt_thread_pool_submit( &connection_pool,
1843                 connection_operation, (void *) op );
1844
1845         if ( rc != 0 ) {
1846                 Debug( LDAP_DEBUG_ANY,
1847                         "connection_op_activate: submit failed (%d) for conn=%lu\n",
1848                         rc, op->o_connid, 0 );
1849                 /* should move op to pending list */
1850         }
1851
1852         return rc;
1853 }
1854
1855 int connection_write(ber_socket_t s)
1856 {
1857         Connection *c;
1858         Operation *op;
1859
1860         assert( connections != NULL );
1861
1862         slapd_clr_write( s, 0 );
1863
1864         c = connection_get( s );
1865         if( c == NULL ) {
1866                 Debug( LDAP_DEBUG_ANY,
1867                         "connection_write(%ld): no connection!\n",
1868                         (long)s, 0, 0 );
1869                 return -1;
1870         }
1871
1872         c->c_n_write++;
1873
1874         Debug( LDAP_DEBUG_TRACE,
1875                 "connection_write(%d): waking output for id=%lu\n",
1876                 s, c->c_connid, 0 );
1877         ldap_pvt_thread_mutex_lock( &c->c_write2_mutex );
1878         ldap_pvt_thread_cond_signal( &c->c_write2_cv );
1879         ldap_pvt_thread_mutex_unlock( &c->c_write2_mutex );
1880
1881         if ( ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_NEEDS_READ, NULL ) ) {
1882                 slapd_set_read( s, 1 );
1883         }
1884         if ( ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_NEEDS_WRITE, NULL ) ) {
1885                 slapd_set_write( s, 1 );
1886         }
1887
1888         /* If there are ops pending because of a writewaiter,
1889          * start one up.
1890          */
1891         while ((op = LDAP_STAILQ_FIRST( &c->c_pending_ops )) != NULL) {
1892                 if ( !c->c_writewaiter ) break;
1893                 if ( c->c_n_ops_executing > connection_pool_max/2 ) break;
1894
1895                 LDAP_STAILQ_REMOVE_HEAD( &c->c_pending_ops, o_next );
1896                 LDAP_STAILQ_NEXT(op, o_next) = NULL;
1897
1898                 /* pending operations should not be marked for abandonment */
1899                 assert(!op->o_abandon);
1900
1901                 c->c_n_ops_pending--;
1902                 c->c_n_ops_executing++;
1903
1904                 connection_op_activate( op );
1905
1906                 break;
1907         }
1908
1909         connection_return( c );
1910         return 0;
1911 }
1912
1913 #ifdef LDAP_SLAPI
1914 typedef struct conn_fake_extblock {
1915         void *eb_conn;
1916         void *eb_op;
1917 } conn_fake_extblock;
1918
1919 static void
1920 connection_fake_destroy(
1921         void *key,
1922         void *data )
1923 {
1924         Connection conn = {0};
1925         Operation op = {0};
1926         Opheader ohdr = {0};
1927
1928         conn_fake_extblock *eb = data;
1929
1930         op.o_hdr = &ohdr;
1931         op.o_hdr->oh_extensions = eb->eb_op;
1932         conn.c_extensions = eb->eb_conn;
1933         op.o_conn = &conn;
1934         conn.c_connid = -1;
1935         op.o_connid = -1;
1936
1937         ber_memfree_x( eb, NULL );
1938         slapi_int_free_object_extensions( SLAPI_X_EXT_OPERATION, &op );
1939         slapi_int_free_object_extensions( SLAPI_X_EXT_CONNECTION, &conn );
1940 }
1941 #endif
1942
1943 void
1944 connection_fake_init(
1945         Connection *conn,
1946         OperationBuffer *opbuf,
1947         void *ctx )
1948 {
1949         connection_fake_init2( conn, opbuf, ctx, 1 );
1950 }
1951
1952 void
1953 operation_fake_init(
1954         Connection *conn,
1955         Operation *op,
1956         void *ctx,
1957         int newmem )
1958 {
1959         /* set memory context */
1960         op->o_tmpmemctx = slap_sl_mem_create(SLAP_SLAB_SIZE, SLAP_SLAB_STACK, ctx,
1961                 newmem );
1962         op->o_tmpmfuncs = &slap_sl_mfuncs;
1963         op->o_threadctx = ctx;
1964         op->o_tid = ldap_pvt_thread_pool_tid( ctx );
1965
1966         op->o_counters = &slap_counters;
1967         op->o_conn = conn;
1968         op->o_connid = op->o_conn->c_connid;
1969         connection_init_log_prefix( op );
1970 }
1971
1972
1973 void
1974 connection_fake_init2(
1975         Connection *conn,
1976         OperationBuffer *opbuf,
1977         void *ctx,
1978         int newmem )
1979 {
1980         Operation *op = (Operation *) opbuf;
1981
1982         conn->c_connid = -1;
1983         conn->c_conn_idx = -1;
1984         conn->c_send_ldap_result = slap_send_ldap_result;
1985         conn->c_send_search_entry = slap_send_search_entry;
1986         conn->c_send_search_reference = slap_send_search_reference;
1987         conn->c_listener = (Listener *)&dummy_list;
1988         conn->c_peer_domain = slap_empty_bv;
1989         conn->c_peer_name = slap_empty_bv;
1990
1991         memset( opbuf, 0, sizeof( *opbuf ));
1992         op->o_hdr = &opbuf->ob_hdr;
1993         op->o_controls = opbuf->ob_controls;
1994
1995         operation_fake_init( conn, op, ctx, newmem );
1996
1997 #ifdef LDAP_SLAPI
1998         if ( slapi_plugins_used ) {
1999                 conn_fake_extblock *eb;
2000                 void *ebx = NULL;
2001
2002                 /* Use thread keys to make sure these eventually get cleaned up */
2003                 if ( ldap_pvt_thread_pool_getkey( ctx, (void *)connection_fake_init,
2004                                 &ebx, NULL )) {
2005                         eb = ch_malloc( sizeof( *eb ));
2006                         slapi_int_create_object_extensions( SLAPI_X_EXT_CONNECTION, conn );
2007                         slapi_int_create_object_extensions( SLAPI_X_EXT_OPERATION, op );
2008                         eb->eb_conn = conn->c_extensions;
2009                         eb->eb_op = op->o_hdr->oh_extensions;
2010                         ldap_pvt_thread_pool_setkey( ctx, (void *)connection_fake_init,
2011                                 eb, connection_fake_destroy, NULL, NULL );
2012                 } else {
2013                         eb = ebx;
2014                         conn->c_extensions = eb->eb_conn;
2015                         op->o_hdr->oh_extensions = eb->eb_op;
2016                 }
2017         }
2018 #endif /* LDAP_SLAPI */
2019
2020         slap_op_time( &op->o_time, &op->o_tincr );
2021 }
2022
2023 void
2024 connection_assign_nextid( Connection *conn )
2025 {
2026         ldap_pvt_thread_mutex_lock( &conn_nextid_mutex );
2027         conn->c_connid = conn_nextid++;
2028         ldap_pvt_thread_mutex_unlock( &conn_nextid_mutex );
2029 }