git.sur5r.net Git - openldap/blob - servers/slapd/connection.c

   1 /* $OpenLDAP$ */
   2 /* This work is part of OpenLDAP Software <http://www.openldap.org/>.
   3  *
   4  * Copyright 1998-2008 The OpenLDAP Foundation.
   5  * All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted only as authorized by the OpenLDAP
   9  * Public License.
  10  *
  11  * A copy of this license is available in the file LICENSE in the
  12  * top-level directory of the distribution or, alternatively, at
  13  * <http://www.OpenLDAP.org/license.html>.
  14  */
  15 /* Portions Copyright (c) 1995 Regents of the University of Michigan.
  16  * All rights reserved.
  17  *
  18  * Redistribution and use in source and binary forms are permitted
  19  * provided that this notice is preserved and that due credit is given
  20  * to the University of Michigan at Ann Arbor. The name of the University
  21  * may not be used to endorse or promote products derived from this
  22  * software without specific prior written permission. This software
  23  * is provided ``as is'' without express or implied warranty.
  24  */
  25
  26 #include "portable.h"
  27
  28 #include <stdio.h>
  29 #ifdef HAVE_LIMITS_H
  30 #include <limits.h>
  31 #endif
  32
  33 #include <ac/socket.h>
  34 #include <ac/errno.h>
  35 #include <ac/string.h>
  36 #include <ac/time.h>
  37 #include <ac/unistd.h>
  38
  39 #include "lutil.h"
  40 #include "slap.h"
  41
  42 #ifdef LDAP_SLAPI
  43 #include "slapi/slapi.h"
  44 #endif
  45
  46 /* protected by connections_mutex */
  47 static ldap_pvt_thread_mutex_t connections_mutex;
  48 static Connection *connections = NULL;
  49
  50 static ldap_pvt_thread_mutex_t conn_nextid_mutex;
  51 static unsigned long conn_nextid = 0;
  52
  53 static const char conn_lost_str[] = "connection lost";
  54
  55 /* structure state (protected by connections_mutex) */
  56 #define SLAP_C_UNINITIALIZED    0x00    /* MUST BE ZERO (0) */
  57 #define SLAP_C_UNUSED                   0x01
  58 #define SLAP_C_USED                             0x02
  59 #define SLAP_C_PENDING                  0x03
  60
  61 /* connection state (protected by c_mutex ) */
  62 #define SLAP_C_INVALID                  0x00    /* MUST BE ZERO (0) */
  63 #define SLAP_C_INACTIVE                 0x01    /* zero threads */
  64 #define SLAP_C_ACTIVE                   0x02    /* one or more threads */
  65 #define SLAP_C_BINDING                  0x03    /* binding */
  66 #define SLAP_C_CLOSING                  0x04    /* closing */
  67 #define SLAP_C_CLIENT                   0x05    /* outbound client conn */
  68
  69 const char *
  70 connection_state2str( int state )
  71 {
  72         switch( state ) {
  73         case SLAP_C_INVALID:    return "!";
  74         case SLAP_C_INACTIVE:   return "|";
  75         case SLAP_C_ACTIVE:             return "";
  76         case SLAP_C_BINDING:    return "B";
  77         case SLAP_C_CLOSING:    return "C";
  78         case SLAP_C_CLIENT:             return "L";
  79         }
  80
  81         return "?";
  82 }
  83
  84 static Connection* connection_get( ber_socket_t s );
  85
  86 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;
 222         int connindex;
 223         Connection* c;
 224
 225         for( c = connection_first( &connindex );
 226                 c != NULL;
 227                 c = connection_next( c, &connindex ) )
 228         {
 229                 /* Don't timeout a slow-running request or a persistent
 230                  * outbound connection. But if it has a writewaiter, see
 231                  * if the waiter has been there too long.
 232                  */
 233                 if(( c->c_n_ops_executing && !c->c_writewaiter)
 234                         || c->c_conn_state == SLAP_C_CLIENT ) {
 235                         continue;
 236                 }
 237
 238                 if( difftime( c->c_activitytime+global_idletimeout, now) < 0 ) {
 239                         /* close it */
 240                         connection_closing( c, "idletimeout" );
 241                         connection_close( c );
 242                         i++;
 243                 }
 244         }
 245         connection_done( c );
 246
 247         return i;
 248 }
 249
 250 static Connection* connection_get( ber_socket_t s )
 251 {
 252         Connection *c;
 253
 254         Debug( LDAP_DEBUG_ARGS,
 255                 "connection_get(%ld)\n",
 256                 (long) s, 0, 0 );
 257
 258         assert( connections != NULL );
 259
 260         if(s == AC_SOCKET_INVALID) return NULL;
 261
 262         assert( s < dtblsize );
 263         c = &connections[s];
 264
 265         if( c != NULL ) {
 266                 ldap_pvt_thread_mutex_lock( &c->c_mutex );
 267
 268                 assert( c->c_struct_state != SLAP_C_UNINITIALIZED );
 269
 270                 if( c->c_struct_state != SLAP_C_USED ) {
 271                         /* connection must have been closed due to resched */
 272
 273                         assert( c->c_conn_state == SLAP_C_INVALID );
 274                         assert( c->c_sd == AC_SOCKET_INVALID );
 275
 276                         Debug( LDAP_DEBUG_CONNS,
 277                                 "connection_get(%d): connection not used\n",
 278                                 s, 0, 0 );
 279
 280                         ldap_pvt_thread_mutex_unlock( &c->c_mutex );
 281                         return NULL;
 282                 }
 283
 284                 Debug( LDAP_DEBUG_TRACE,
 285                         "connection_get(%d): got connid=%lu\n",
 286                         s, c->c_connid, 0 );
 287
 288                 c->c_n_get++;
 289
 290                 assert( c->c_struct_state == SLAP_C_USED );
 291                 assert( c->c_conn_state != SLAP_C_INVALID );
 292                 assert( c->c_sd != AC_SOCKET_INVALID );
 293
 294 #ifndef SLAPD_MONITOR
 295                 if ( global_idletimeout > 0 )
 296 #endif /* ! SLAPD_MONITOR */
 297                 {
 298                         c->c_activitytime = slap_get_time();
 299                 }
 300         }
 301
 302         return c;
 303 }
 304
 305 static void connection_return( Connection *c )
 306 {
 307         ldap_pvt_thread_mutex_unlock( &c->c_mutex );
 308 }
 309
 310 Connection * connection_init(
 311         ber_socket_t s,
 312         Listener *listener,
 313         const char* dnsname,
 314         const char* peername,
 315         int flags,
 316         slap_ssf_t ssf,
 317         struct berval *authid
 318         LDAP_PF_LOCAL_SENDMSG_ARG(struct berval *peerbv))
 319 {
 320         unsigned long id;
 321         Connection *c;
 322         int doinit = 0;
 323         ber_socket_t sfd = SLAP_FD2SOCK(s);
 324
 325         assert( connections != NULL );
 326
 327         assert( listener != NULL );
 328         assert( dnsname != NULL );
 329         assert( peername != NULL );
 330
 331 #ifndef HAVE_TLS
 332         assert( !( flags & CONN_IS_TLS ));
 333 #endif
 334
 335         if( s == AC_SOCKET_INVALID ) {
 336                 Debug( LDAP_DEBUG_ANY,
 337                         "connection_init: init of socket %ld invalid.\n", (long)s, 0, 0 );
 338                 return NULL;
 339         }
 340
 341         assert( s >= 0 );
 342         assert( s < dtblsize );
 343         c = &connections[s];
 344         if( c->c_struct_state == SLAP_C_UNINITIALIZED ) {
 345                 doinit = 1;
 346         } else {
 347                 assert( c->c_struct_state == SLAP_C_UNUSED );
 348         }
 349
 350         if( doinit ) {
 351                 c->c_send_ldap_result = slap_send_ldap_result;
 352                 c->c_send_search_entry = slap_send_search_entry;
 353                 c->c_send_search_reference = slap_send_search_reference;
 354                 c->c_send_ldap_extended = slap_send_ldap_extended;
 355                 c->c_send_ldap_intermediate = slap_send_ldap_intermediate;
 356
 357                 BER_BVZERO( &c->c_authmech );
 358                 BER_BVZERO( &c->c_dn );
 359                 BER_BVZERO( &c->c_ndn );
 360
 361                 c->c_listener = NULL;
 362                 BER_BVZERO( &c->c_peer_domain );
 363                 BER_BVZERO( &c->c_peer_name );
 364
 365                 LDAP_STAILQ_INIT(&c->c_ops);
 366                 LDAP_STAILQ_INIT(&c->c_pending_ops);
 367
 368 #ifdef LDAP_X_TXN
 369                 c->c_txn = CONN_TXN_INACTIVE;
 370                 c->c_txn_backend = NULL;
 371                 LDAP_STAILQ_INIT(&c->c_txn_ops);
 372 #endif
 373
 374                 BER_BVZERO( &c->c_sasl_bind_mech );
 375                 c->c_sasl_done = 0;
 376                 c->c_sasl_authctx = NULL;
 377                 c->c_sasl_sockctx = NULL;
 378                 c->c_sasl_extra = NULL;
 379                 c->c_sasl_bindop = NULL;
 380
 381                 c->c_sb = ber_sockbuf_alloc( );
 382
 383                 {
 384                         ber_len_t max = sockbuf_max_incoming;
 385                         ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_SET_MAX_INCOMING, &max );
 386                 }
 387
 388                 c->c_currentber = NULL;
 389
 390                 /* should check status of thread calls */
 391                 ldap_pvt_thread_mutex_init( &c->c_mutex );
 392                 ldap_pvt_thread_mutex_init( &c->c_write1_mutex );
 393                 ldap_pvt_thread_mutex_init( &c->c_write2_mutex );
 394                 ldap_pvt_thread_cond_init( &c->c_write1_cv );
 395                 ldap_pvt_thread_cond_init( &c->c_write2_cv );
 396
 397 #ifdef LDAP_SLAPI
 398                 if ( slapi_plugins_used ) {
 399                         slapi_int_create_object_extensions( SLAPI_X_EXT_CONNECTION, c );
 400                 }
 401 #endif
 402         }
 403
 404         ldap_pvt_thread_mutex_lock( &c->c_mutex );
 405
 406         assert( BER_BVISNULL( &c->c_authmech ) );
 407         assert( BER_BVISNULL( &c->c_dn ) );
 408         assert( BER_BVISNULL( &c->c_ndn ) );
 409         assert( c->c_listener == NULL );
 410         assert( BER_BVISNULL( &c->c_peer_domain ) );
 411         assert( BER_BVISNULL( &c->c_peer_name ) );
 412         assert( LDAP_STAILQ_EMPTY(&c->c_ops) );
 413         assert( LDAP_STAILQ_EMPTY(&c->c_pending_ops) );
 414 #ifdef LDAP_X_TXN
 415         assert( c->c_txn == CONN_TXN_INACTIVE );
 416         assert( c->c_txn_backend == NULL );
 417         assert( LDAP_STAILQ_EMPTY(&c->c_txn_ops) );
 418 #endif
 419         assert( BER_BVISNULL( &c->c_sasl_bind_mech ) );
 420         assert( c->c_sasl_done == 0 );
 421         assert( c->c_sasl_authctx == NULL );
 422         assert( c->c_sasl_sockctx == NULL );
 423         assert( c->c_sasl_extra == NULL );
 424         assert( c->c_sasl_bindop == NULL );
 425         assert( c->c_currentber == NULL );
 426         assert( c->c_writewaiter == 0);
 427         assert( c->c_writers == 0);
 428
 429         c->c_listener = listener;
 430         c->c_sd = s;
 431
 432         if ( flags & CONN_IS_CLIENT ) {
 433                 c->c_connid = 0;
 434                 ldap_pvt_thread_mutex_lock( &connections_mutex );
 435                 c->c_conn_state = SLAP_C_CLIENT;
 436                 c->c_struct_state = SLAP_C_USED;
 437                 ldap_pvt_thread_mutex_unlock( &connections_mutex );
 438                 c->c_close_reason = "?";                        /* should never be needed */
 439                 ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_SET_FD, &sfd );
 440                 ldap_pvt_thread_mutex_unlock( &c->c_mutex );
 441
 442                 return c;
 443         }
 444
 445         ber_str2bv( dnsname, 0, 1, &c->c_peer_domain );
 446         ber_str2bv( peername, 0, 1, &c->c_peer_name );
 447
 448         c->c_n_ops_received = 0;
 449         c->c_n_ops_executing = 0;
 450         c->c_n_ops_pending = 0;
 451         c->c_n_ops_completed = 0;
 452
 453         c->c_n_get = 0;
 454         c->c_n_read = 0;
 455         c->c_n_write = 0;
 456
 457         /* set to zero until bind, implies LDAP_VERSION3 */
 458         c->c_protocol = 0;
 459
 460 #ifndef SLAPD_MONITOR
 461         if ( global_idletimeout > 0 )
 462 #endif /* ! SLAPD_MONITOR */
 463         {
 464                 c->c_activitytime = c->c_starttime = slap_get_time();
 465         }
 466
 467 #ifdef LDAP_CONNECTIONLESS
 468         c->c_is_udp = 0;
 469         if( flags & CONN_IS_UDP ) {
 470                 c->c_is_udp = 1;
 471 #ifdef LDAP_DEBUG
 472                 ber_sockbuf_add_io( c->c_sb, &ber_sockbuf_io_debug,
 473                         LBER_SBIOD_LEVEL_PROVIDER, (void*)"udp_" );
 474 #endif
 475                 ber_sockbuf_add_io( c->c_sb, &ber_sockbuf_io_udp,
 476                         LBER_SBIOD_LEVEL_PROVIDER, (void *)&sfd );
 477                 ber_sockbuf_add_io( c->c_sb, &ber_sockbuf_io_readahead,
 478                         LBER_SBIOD_LEVEL_PROVIDER, NULL );
 479         } else
 480 #endif /* LDAP_CONNECTIONLESS */
 481 #ifdef LDAP_PF_LOCAL
 482         if ( flags & CONN_IS_IPC ) {
 483 #ifdef LDAP_DEBUG
 484                 ber_sockbuf_add_io( c->c_sb, &ber_sockbuf_io_debug,
 485                         LBER_SBIOD_LEVEL_PROVIDER, (void*)"ipc_" );
 486 #endif
 487                 ber_sockbuf_add_io( c->c_sb, &ber_sockbuf_io_fd,
 488                         LBER_SBIOD_LEVEL_PROVIDER, (void *)&sfd );
 489 #ifdef LDAP_PF_LOCAL_SENDMSG
 490                 if ( !BER_BVISEMPTY( peerbv ))
 491                         ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_UNGET_BUF, peerbv );
 492 #endif
 493         } else
 494 #endif /* LDAP_PF_LOCAL */
 495         {
 496 #ifdef LDAP_DEBUG
 497                 ber_sockbuf_add_io( c->c_sb, &ber_sockbuf_io_debug,
 498                         LBER_SBIOD_LEVEL_PROVIDER, (void*)"tcp_" );
 499 #endif
 500                 ber_sockbuf_add_io( c->c_sb, &ber_sockbuf_io_tcp,
 501                         LBER_SBIOD_LEVEL_PROVIDER, (void *)&sfd );
 502         }
 503
 504 #ifdef LDAP_DEBUG
 505         ber_sockbuf_add_io( c->c_sb, &ber_sockbuf_io_debug,
 506                 INT_MAX, (void*)"ldap_" );
 507 #endif
 508
 509         if( ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_SET_NONBLOCK,
 510                 c /* non-NULL */ ) < 0 )
 511         {
 512                 Debug( LDAP_DEBUG_ANY,
 513                         "connection_init(%d, %s): set nonblocking failed\n",
 514                         s, c->c_peer_name.bv_val, 0 );
 515         }
 516
 517         ldap_pvt_thread_mutex_lock( &conn_nextid_mutex );
 518         id = c->c_connid = conn_nextid++;
 519         ldap_pvt_thread_mutex_unlock( &conn_nextid_mutex );
 520
 521         ldap_pvt_thread_mutex_lock( &connections_mutex );
 522         c->c_conn_state = SLAP_C_INACTIVE;
 523         c->c_struct_state = SLAP_C_USED;
 524         ldap_pvt_thread_mutex_unlock( &connections_mutex );
 525         c->c_close_reason = "?";                        /* should never be needed */
 526
 527         c->c_ssf = c->c_transport_ssf = ssf;
 528         c->c_tls_ssf = 0;
 529
 530 #ifdef HAVE_TLS
 531         if ( flags & CONN_IS_TLS ) {
 532                 c->c_is_tls = 1;
 533                 c->c_needs_tls_accept = 1;
 534         } else {
 535                 c->c_is_tls = 0;
 536                 c->c_needs_tls_accept = 0;
 537         }
 538 #endif
 539
 540         slap_sasl_open( c, 0 );
 541         slap_sasl_external( c, ssf, authid );
 542
 543         slapd_add_internal( s, 1 );
 544         ldap_pvt_thread_mutex_unlock( &c->c_mutex );
 545
 546         backend_connection_init(c);
 547
 548         return c;
 549 }
 550
 551 void connection2anonymous( Connection *c )
 552 {
 553         assert( connections != NULL );
 554         assert( c != NULL );
 555
 556         {
 557                 ber_len_t max = sockbuf_max_incoming;
 558                 ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_SET_MAX_INCOMING, &max );
 559         }
 560
 561         if ( !BER_BVISNULL( &c->c_authmech ) ) {
 562                 ch_free(c->c_authmech.bv_val);
 563         }
 564         BER_BVZERO( &c->c_authmech );
 565
 566         if ( !BER_BVISNULL( &c->c_dn ) ) {
 567                 ch_free(c->c_dn.bv_val);
 568         }
 569         BER_BVZERO( &c->c_dn );
 570
 571         if ( !BER_BVISNULL( &c->c_ndn ) ) {
 572                 ch_free(c->c_ndn.bv_val);
 573         }
 574         BER_BVZERO( &c->c_ndn );
 575
 576         if ( !BER_BVISNULL( &c->c_sasl_authz_dn ) ) {
 577                 ber_memfree_x( c->c_sasl_authz_dn.bv_val, NULL );
 578         }
 579         BER_BVZERO( &c->c_sasl_authz_dn );
 580
 581         c->c_authz_backend = NULL;
 582 }
 583
 584 static void
 585 connection_destroy( Connection *c )
 586 {
 587         unsigned long   connid;
 588         const char              *close_reason;
 589         Sockbuf                 *sb;
 590         ber_socket_t    sd;
 591
 592         assert( connections != NULL );
 593         assert( c != NULL );
 594         assert( c->c_struct_state != SLAP_C_UNUSED );
 595         assert( c->c_conn_state != SLAP_C_INVALID );
 596         assert( LDAP_STAILQ_EMPTY(&c->c_ops) );
 597         assert( LDAP_STAILQ_EMPTY(&c->c_pending_ops) );
 598 #ifdef LDAP_X_TXN
 599         assert( c->c_txn == CONN_TXN_INACTIVE );
 600         assert( c->c_txn_backend == NULL );
 601         assert( LDAP_STAILQ_EMPTY(&c->c_txn_ops) );
 602 #endif
 603         assert( c->c_writewaiter == 0);
 604         assert( c->c_writers == 0);
 605
 606         /* only for stats (print -1 as "%lu" may give unexpected results ;) */
 607         connid = c->c_connid;
 608         close_reason = c->c_close_reason;
 609
 610         ldap_pvt_thread_mutex_lock( &connections_mutex );
 611         c->c_struct_state = SLAP_C_PENDING;
 612         ldap_pvt_thread_mutex_unlock( &connections_mutex );
 613
 614         backend_connection_destroy(c);
 615
 616         c->c_protocol = 0;
 617         c->c_connid = -1;
 618
 619         c->c_activitytime = c->c_starttime = 0;
 620
 621         connection2anonymous( c );
 622         c->c_listener = NULL;
 623
 624         if(c->c_peer_domain.bv_val != NULL) {
 625                 free(c->c_peer_domain.bv_val);
 626         }
 627         BER_BVZERO( &c->c_peer_domain );
 628         if(c->c_peer_name.bv_val != NULL) {
 629                 free(c->c_peer_name.bv_val);
 630         }
 631         BER_BVZERO( &c->c_peer_name );
 632
 633         c->c_sasl_bind_in_progress = 0;
 634         if(c->c_sasl_bind_mech.bv_val != NULL) {
 635                 free(c->c_sasl_bind_mech.bv_val);
 636         }
 637         BER_BVZERO( &c->c_sasl_bind_mech );
 638
 639         slap_sasl_close( c );
 640
 641         if ( c->c_currentber != NULL ) {
 642                 ber_free( c->c_currentber, 1 );
 643                 c->c_currentber = NULL;
 644         }
 645
 646
 647 #ifdef LDAP_SLAPI
 648         /* call destructors, then constructors; avoids unnecessary allocation */
 649         if ( slapi_plugins_used ) {
 650                 slapi_int_clear_object_extensions( SLAPI_X_EXT_CONNECTION, c );
 651         }
 652 #endif
 653
 654         sd = c->c_sd;
 655         c->c_sd = AC_SOCKET_INVALID;
 656         c->c_conn_state = SLAP_C_INVALID;
 657         c->c_struct_state = SLAP_C_UNUSED;
 658         c->c_close_reason = "?";                        /* should never be needed */
 659
 660         sb = c->c_sb;
 661         c->c_sb = ber_sockbuf_alloc( );
 662         {
 663                 ber_len_t max = sockbuf_max_incoming;
 664                 ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_SET_MAX_INCOMING, &max );
 665         }
 666
 667         /* c must be fully reset by this point; when we call slapd_remove
 668          * it may get immediately reused by a new connection.
 669          */
 670         if ( sd != AC_SOCKET_INVALID ) {
 671                 slapd_remove( sd, sb, 1, 0, 0 );
 672
 673                 if ( close_reason == NULL ) {
 674                         Statslog( LDAP_DEBUG_STATS, "conn=%lu fd=%ld closed\n",
 675                                 connid, (long) sd, 0, 0, 0 );
 676                 } else {
 677                         Statslog( LDAP_DEBUG_STATS, "conn=%lu fd=%ld closed (%s)\n",
 678                                 connid, (long) sd, close_reason, 0, 0 );
 679                 }
 680         }
 681 }
 682
 683 int connection_state_closing( Connection *c )
 684 {
 685         /* c_mutex must be locked by caller */
 686
 687         int state;
 688         assert( c != NULL );
 689         assert( c->c_struct_state == SLAP_C_USED );
 690
 691         state = c->c_conn_state;
 692
 693         assert( state != SLAP_C_INVALID );
 694
 695         return state == SLAP_C_CLOSING;
 696 }
 697
 698 static void connection_abandon( Connection *c )
 699 {
 700         /* c_mutex must be locked by caller */
 701
 702         Operation *o, *next, op = {0};
 703         Opheader ohdr = {0};
 704         SlapReply rs = {0};
 705
 706         op.o_hdr = &ohdr;
 707         op.o_conn = c;
 708         op.o_connid = c->c_connid;
 709         op.o_tag = LDAP_REQ_ABANDON;
 710
 711         for ( o = LDAP_STAILQ_FIRST( &c->c_ops ); o; o=next ) {
 712                 next = LDAP_STAILQ_NEXT( o, o_next );
 713                 op.orn_msgid = o->o_msgid;
 714                 o->o_abandon = 1;
 715                 op.o_bd = frontendDB;
 716                 frontendDB->be_abandon( &op, &rs );
 717         }
 718
 719 #ifdef LDAP_X_TXN
 720         /* remove operations in pending transaction */
 721         while ( (o = LDAP_STAILQ_FIRST( &c->c_txn_ops )) != NULL) {
 722                 LDAP_STAILQ_REMOVE_HEAD( &c->c_txn_ops, o_next );
 723                 LDAP_STAILQ_NEXT(o, o_next) = NULL;
 724                 slap_op_free( o, NULL );
 725         }
 726
 727         /* clear transaction */
 728         c->c_txn_backend = NULL;
 729         c->c_txn = CONN_TXN_INACTIVE;
 730 #endif
 731
 732         /* remove pending operations */
 733         while ( (o = LDAP_STAILQ_FIRST( &c->c_pending_ops )) != NULL) {
 734                 LDAP_STAILQ_REMOVE_HEAD( &c->c_pending_ops, o_next );
 735                 LDAP_STAILQ_NEXT(o, o_next) = NULL;
 736                 slap_op_free( o, NULL );
 737         }
 738 }
 739
 740 void connection_closing( Connection *c, const char *why )
 741 {
 742         assert( connections != NULL );
 743         assert( c != NULL );
 744         assert( c->c_struct_state == SLAP_C_USED );
 745         assert( c->c_conn_state != SLAP_C_INVALID );
 746
 747         /* c_mutex must be locked by caller */
 748
 749         if( c->c_conn_state != SLAP_C_CLOSING ) {
 750                 Debug( LDAP_DEBUG_CONNS,
 751                         "connection_closing: readying conn=%lu sd=%d for close\n",
 752                         c->c_connid, c->c_sd, 0 );
 753                 /* update state to closing */
 754                 c->c_conn_state = SLAP_C_CLOSING;
 755                 c->c_close_reason = why;
 756
 757                 /* don't listen on this port anymore */
 758                 slapd_clr_read( c->c_sd, 0 );
 759
 760                 /* abandon active operations */
 761                 connection_abandon( c );
 762
 763                 /* wake write blocked operations */
 764                 ldap_pvt_thread_mutex_lock( &c->c_write1_mutex );
 765                 if ( c->c_writers > 0 ) {
 766                         c->c_writers = -c->c_writers;
 767                         ldap_pvt_thread_cond_broadcast( &c->c_write1_cv );
 768                         ldap_pvt_thread_mutex_unlock( &c->c_write1_mutex );
 769                         if ( c->c_writewaiter ) {
 770                                 ldap_pvt_thread_mutex_lock( &c->c_write2_mutex );
 771                                 ldap_pvt_thread_cond_signal( &c->c_write2_cv );
 772                                 slapd_clr_write( c->c_sd, 1 );
 773                                 ldap_pvt_thread_mutex_unlock( &c->c_write2_mutex );
 774                         }
 775                         ldap_pvt_thread_mutex_lock( &c->c_write1_mutex );
 776                         while ( c->c_writers ) {
 777                                 ldap_pvt_thread_cond_wait( &c->c_write1_cv, &c->c_write1_mutex );
 778                         }
 779                         ldap_pvt_thread_mutex_unlock( &c->c_write1_mutex );
 780                 } else {
 781                         ldap_pvt_thread_mutex_unlock( &c->c_write1_mutex );
 782                         slapd_clr_write( c->c_sd, 1 );
 783                 }
 784
 785         } else if( why == NULL && c->c_close_reason == conn_lost_str ) {
 786                 /* Client closed connection after doing Unbind. */
 787                 c->c_close_reason = NULL;
 788         }
 789 }
 790
 791 static void
 792 connection_close( Connection *c )
 793 {
 794         assert( connections != NULL );
 795         assert( c != NULL );
 796         assert( c->c_struct_state == SLAP_C_USED );
 797         assert( c->c_conn_state == SLAP_C_CLOSING );
 798
 799         /* NOTE: c_mutex should be locked by caller */
 800
 801         if ( !LDAP_STAILQ_EMPTY(&c->c_ops) ||
 802                 !LDAP_STAILQ_EMPTY(&c->c_pending_ops) )
 803         {
 804                 Debug( LDAP_DEBUG_CONNS,
 805                         "connection_close: deferring conn=%lu sd=%d\n",
 806                         c->c_connid, c->c_sd, 0 );
 807                 return;
 808         }
 809
 810         Debug( LDAP_DEBUG_TRACE, "connection_close: conn=%lu sd=%d\n",
 811                 c->c_connid, c->c_sd, 0 );
 812
 813         connection_destroy( c );
 814 }
 815
 816 unsigned long connections_nextid(void)
 817 {
 818         unsigned long id;
 819         assert( connections != NULL );
 820
 821         ldap_pvt_thread_mutex_lock( &conn_nextid_mutex );
 822
 823         id = conn_nextid;
 824
 825         ldap_pvt_thread_mutex_unlock( &conn_nextid_mutex );
 826
 827         return id;
 828 }
 829
 830 Connection* connection_first( ber_socket_t *index )
 831 {
 832         assert( connections != NULL );
 833         assert( index != NULL );
 834
 835         ldap_pvt_thread_mutex_lock( &connections_mutex );
 836         for( *index = 0; *index < dtblsize; (*index)++) {
 837                 if( connections[*index].c_struct_state != SLAP_C_UNINITIALIZED ) {
 838                         break;
 839                 }
 840         }
 841         ldap_pvt_thread_mutex_unlock( &connections_mutex );
 842
 843         return connection_next(NULL, index);
 844 }
 845
 846 Connection* connection_next( Connection *c, ber_socket_t *index )
 847 {
 848         assert( connections != NULL );
 849         assert( index != NULL );
 850         assert( *index <= dtblsize );
 851
 852         if( c != NULL ) ldap_pvt_thread_mutex_unlock( &c->c_mutex );
 853
 854         c = NULL;
 855
 856         ldap_pvt_thread_mutex_lock( &connections_mutex );
 857         for(; *index < dtblsize; (*index)++) {
 858                 int c_struct;
 859                 if( connections[*index].c_struct_state == SLAP_C_UNINITIALIZED ) {
 860                         /* FIXME: accessing c_conn_state without locking c_mutex */
 861                         assert( connections[*index].c_conn_state == SLAP_C_INVALID );
 862                         continue;
 863                 }
 864
 865                 if( connections[*index].c_struct_state == SLAP_C_USED ) {
 866                         c = &connections[(*index)++];
 867                         if ( ldap_pvt_thread_mutex_trylock( &c->c_mutex )) {
 868                                 /* avoid deadlock */
 869                                 ldap_pvt_thread_mutex_unlock( &connections_mutex );
 870                                 ldap_pvt_thread_mutex_lock( &c->c_mutex );
 871                                 ldap_pvt_thread_mutex_lock( &connections_mutex );
 872                                 if ( c->c_struct_state != SLAP_C_USED ) {
 873                                         ldap_pvt_thread_mutex_unlock( &c->c_mutex );
 874                                         c = NULL;
 875                                         continue;
 876                                 }
 877                         }
 878                         assert( c->c_conn_state != SLAP_C_INVALID );
 879                         break;
 880                 }
 881
 882                 c_struct = connections[*index].c_struct_state;
 883                 if ( c_struct == SLAP_C_PENDING )
 884                         continue;
 885                 assert( c_struct == SLAP_C_UNUSED );
 886                 /* FIXME: accessing c_conn_state without locking c_mutex */
 887                 assert( connections[*index].c_conn_state == SLAP_C_INVALID );
 888         }
 889
 890         ldap_pvt_thread_mutex_unlock( &connections_mutex );
 891         return c;
 892 }
 893
 894 void connection_done( Connection *c )
 895 {
 896         assert( connections != NULL );
 897
 898         if( c != NULL ) ldap_pvt_thread_mutex_unlock( &c->c_mutex );
 899 }
 900
 901 /*
 902  * connection_activity - handle the request operation op on connection
 903  * conn.  This routine figures out what kind of operation it is and
 904  * calls the appropriate stub to handle it.
 905  */
 906
 907 #ifdef SLAPD_MONITOR
 908 /* FIXME: returns 0 in case of failure */
 909 #define INCR_OP_INITIATED(index) \
 910         do { \
 911                 ldap_pvt_thread_mutex_lock( &op->o_counters->sc_mutex ); \
 912                 ldap_pvt_mp_add_ulong(op->o_counters->sc_ops_initiated_[(index)], 1); \
 913                 ldap_pvt_thread_mutex_unlock( &op->o_counters->sc_mutex ); \
 914         } while (0)
 915 #define INCR_OP_COMPLETED(index) \
 916         do { \
 917                 ldap_pvt_thread_mutex_lock( &op->o_counters->sc_mutex ); \
 918                 ldap_pvt_mp_add_ulong(op->o_counters->sc_ops_completed, 1); \
 919                 ldap_pvt_mp_add_ulong(op->o_counters->sc_ops_completed_[(index)], 1); \
 920                 ldap_pvt_thread_mutex_unlock( &op->o_counters->sc_mutex ); \
 921         } while (0)
 922 #else /* !SLAPD_MONITOR */
 923 #define INCR_OP_INITIATED(index) do { } while (0)
 924 #define INCR_OP_COMPLETED(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_completed, 1); \
 928                 ldap_pvt_thread_mutex_unlock( &op->o_counters->sc_mutex ); \
 929         } while (0)
 930 #endif /* !SLAPD_MONITOR */
 931
 932 /*
 933  * NOTE: keep in sync with enum in slapd.h
 934  */
 935 static BI_op_func *opfun[] = {
 936         do_bind,
 937         do_unbind,
 938         do_search,
 939         do_compare,
 940         do_modify,
 941         do_modrdn,
 942         do_add,
 943         do_delete,
 944         do_abandon,
 945         do_extended,
 946         NULL
 947 };
 948
 949 /* Counters are per-thread, not per-connection.
 950  */
 951 static void
 952 conn_counter_destroy( void *key, void *data )
 953 {
 954         slap_counters_t **prev, *sc;
 955
 956         ldap_pvt_thread_mutex_lock( &slap_counters.sc_mutex );
 957         for ( prev = &slap_counters.sc_next, sc = slap_counters.sc_next; sc;
 958                 prev = &sc->sc_next, sc = sc->sc_next ) {
 959                 if ( sc == data ) {
 960                         int i;
 961
 962                         *prev = sc->sc_next;
 963                         /* Copy data to main counter */
 964                         ldap_pvt_mp_add( slap_counters.sc_bytes, sc->sc_bytes );
 965                         ldap_pvt_mp_add( slap_counters.sc_pdu, sc->sc_pdu );
 966                         ldap_pvt_mp_add( slap_counters.sc_entries, sc->sc_entries );
 967                         ldap_pvt_mp_add( slap_counters.sc_refs, sc->sc_refs );
 968                         ldap_pvt_mp_add( slap_counters.sc_ops_initiated, sc->sc_ops_initiated );
 969                         ldap_pvt_mp_add( slap_counters.sc_ops_completed, sc->sc_ops_completed );
 970 #ifdef SLAPD_MONITOR
 971                         for ( i = 0; i < SLAP_OP_LAST; i++ ) {
 972                                 ldap_pvt_mp_add( slap_counters.sc_ops_initiated_[ i ], sc->sc_ops_initiated_[ i ] );
 973                                 ldap_pvt_mp_add( slap_counters.sc_ops_initiated_[ i ], sc->sc_ops_completed_[ i ] );
 974                         }
 975 #endif /* SLAPD_MONITOR */
 976                         slap_counters_destroy( sc );
 977                         ber_memfree_x( data, NULL );
 978                         break;
 979                 }
 980         }
 981         ldap_pvt_thread_mutex_unlock( &slap_counters.sc_mutex );
 982 }
 983
 984 static void
 985 conn_counter_init( Operation *op, void *ctx )
 986 {
 987         slap_counters_t *sc;
 988         void *vsc = NULL;
 989
 990         if ( ldap_pvt_thread_pool_getkey(
 991                         ctx, (void *)conn_counter_init, &vsc, NULL ) || !vsc ) {
 992                 vsc = ch_malloc( sizeof( slap_counters_t ));
 993                 sc = vsc;
 994                 slap_counters_init( sc );
 995                 ldap_pvt_thread_pool_setkey( ctx, (void*)conn_counter_init, vsc,
 996                         conn_counter_destroy, NULL, NULL );
 997
 998                 ldap_pvt_thread_mutex_lock( &slap_counters.sc_mutex );
 999                 sc->sc_next = slap_counters.sc_next;
1000                 slap_counters.sc_next = sc;
1001                 ldap_pvt_thread_mutex_unlock( &slap_counters.sc_mutex );
1002         }
1003         op->o_counters = vsc;
1004 }
1005
1006 static void *
1007 connection_operation( void *ctx, void *arg_v )
1008 {
1009         int rc = LDAP_OTHER;
1010         Operation *op = arg_v;
1011         SlapReply rs = {REP_RESULT};
1012         ber_tag_t tag = op->o_tag;
1013         slap_op_t opidx = SLAP_OP_LAST;
1014         Connection *conn = op->o_conn;
1015         void *memctx = NULL;
1016         void *memctx_null = NULL;
1017         ber_len_t memsiz;
1018
1019         conn_counter_init( op, ctx );
1020         ldap_pvt_thread_mutex_lock( &op->o_counters->sc_mutex );
1021         /* FIXME: returns 0 in case of failure */
1022         ldap_pvt_mp_add_ulong(op->o_counters->sc_ops_initiated, 1);
1023         ldap_pvt_thread_mutex_unlock( &op->o_counters->sc_mutex );
1024
1025         op->o_threadctx = ctx;
1026         op->o_tid = ldap_pvt_thread_pool_tid( ctx );
1027
1028         switch ( tag ) {
1029         case LDAP_REQ_BIND:
1030         case LDAP_REQ_UNBIND:
1031         case LDAP_REQ_ADD:
1032         case LDAP_REQ_DELETE:
1033         case LDAP_REQ_MODDN:
1034         case LDAP_REQ_MODIFY:
1035         case LDAP_REQ_COMPARE:
1036         case LDAP_REQ_SEARCH:
1037         case LDAP_REQ_ABANDON:
1038         case LDAP_REQ_EXTENDED:
1039                 break;
1040         default:
1041                 Debug( LDAP_DEBUG_ANY, "connection_operation: "
1042                         "conn %lu unknown LDAP request 0x%lx\n",
1043                         conn->c_connid, tag, 0 );
1044                 op->o_tag = LBER_ERROR;
1045                 rs.sr_err = LDAP_PROTOCOL_ERROR;
1046                 rs.sr_text = "unknown LDAP request";
1047                 send_ldap_disconnect( op, &rs );
1048                 rc = SLAPD_DISCONNECT;
1049                 goto operations_error;
1050         }
1051
1052         if( conn->c_sasl_bind_in_progress && tag != LDAP_REQ_BIND ) {
1053                 Debug( LDAP_DEBUG_ANY, "connection_operation: "
1054                         "error: SASL bind in progress (tag=%ld).\n",
1055                         (long) tag, 0, 0 );
1056                 send_ldap_error( op, &rs, LDAP_OPERATIONS_ERROR,
1057                         "SASL bind in progress" );
1058                 rc = LDAP_OPERATIONS_ERROR;
1059                 goto operations_error;
1060         }
1061
1062 #ifdef LDAP_X_TXN
1063         if (( conn->c_txn == CONN_TXN_SPECIFY ) && (
1064                 ( tag == LDAP_REQ_ADD ) ||
1065                 ( tag == LDAP_REQ_DELETE ) ||
1066                 ( tag == LDAP_REQ_MODIFY ) ||
1067                 ( tag == LDAP_REQ_MODRDN )))
1068         {
1069                 /* Disable SLAB allocator for all update operations
1070                         issued inside of a transaction */
1071                 op->o_tmpmemctx = NULL;
1072                 op->o_tmpmfuncs = &ch_mfuncs;
1073         } else
1074 #endif
1075         {
1076         /* We can use Thread-Local storage for most mallocs. We can
1077          * also use TL for ber parsing, but not on Add or Modify.
1078          */
1079 #if 0
1080         memsiz = ber_len( op->o_ber ) * 64;
1081         if ( SLAP_SLAB_SIZE > memsiz ) memsiz = SLAP_SLAB_SIZE;
1082 #endif
1083         memsiz = SLAP_SLAB_SIZE;
1084
1085         memctx = slap_sl_mem_create( memsiz, SLAP_SLAB_STACK, ctx, 1 );
1086         op->o_tmpmemctx = memctx;
1087         op->o_tmpmfuncs = &slap_sl_mfuncs;
1088         if ( tag != LDAP_REQ_ADD && tag != LDAP_REQ_MODIFY ) {
1089                 /* Note - the ber and its buffer are already allocated from
1090                  * regular memory; this only affects subsequent mallocs that
1091                  * ber_scanf may invoke.
1092                  */
1093                 ber_set_option( op->o_ber, LBER_OPT_BER_MEMCTX, &memctx );
1094         }
1095         }
1096
1097         opidx = slap_req2op( tag );
1098         assert( opidx != SLAP_OP_LAST );
1099         INCR_OP_INITIATED( opidx );
1100         rc = (*(opfun[opidx]))( op, &rs );
1101
1102 operations_error:
1103         if ( rc == SLAPD_DISCONNECT ) {
1104                 tag = LBER_ERROR;
1105
1106         } else if ( opidx != SLAP_OP_LAST ) {
1107                 /* increment completed operations count
1108                  * only if operation was initiated
1109                  * and rc != SLAPD_DISCONNECT */
1110                 INCR_OP_COMPLETED( opidx );
1111         }
1112
1113         if ( op->o_cancel == SLAP_CANCEL_REQ ) {
1114                 if ( rc == SLAPD_ABANDON ) {
1115                         op->o_cancel = SLAP_CANCEL_ACK;
1116                 } else {
1117                         op->o_cancel = LDAP_TOO_LATE;
1118                 }
1119         }
1120
1121         while ( op->o_cancel != SLAP_CANCEL_NONE &&
1122                 op->o_cancel != SLAP_CANCEL_DONE )
1123         {
1124                 ldap_pvt_thread_yield();
1125         }
1126
1127         ldap_pvt_thread_mutex_lock( &conn->c_mutex );
1128
1129         ber_set_option( op->o_ber, LBER_OPT_BER_MEMCTX, &memctx_null );
1130
1131         LDAP_STAILQ_REMOVE( &conn->c_ops, op, Operation, o_next);
1132         LDAP_STAILQ_NEXT(op, o_next) = NULL;
1133         conn->c_n_ops_executing--;
1134         conn->c_n_ops_completed++;
1135
1136         switch( tag ) {
1137         case LBER_ERROR:
1138         case LDAP_REQ_UNBIND:
1139                 /* c_mutex is locked */
1140                 connection_closing( conn,
1141                         tag == LDAP_REQ_UNBIND ? NULL : "operations error" );
1142                 break;
1143         }
1144
1145         connection_resched( conn );
1146         ldap_pvt_thread_mutex_unlock( &conn->c_mutex );
1147         slap_op_free( op, ctx );
1148         return NULL;
1149 }
1150
1151 static const Listener dummy_list = { BER_BVC(""), BER_BVC("") };
1152
1153 Connection *connection_client_setup(
1154         ber_socket_t s,
1155         ldap_pvt_thread_start_t *func,
1156         void *arg )
1157 {
1158         Connection *c;
1159         ber_socket_t sfd = SLAP_SOCKNEW( s );
1160
1161         c = connection_init( sfd, (Listener *)&dummy_list, "", "",
1162                 CONN_IS_CLIENT, 0, NULL
1163                 LDAP_PF_LOCAL_SENDMSG_ARG(NULL));
1164         if ( c ) {
1165                 c->c_clientfunc = func;
1166                 c->c_clientarg = arg;
1167
1168                 slapd_add_internal( sfd, 0 );
1169         }
1170         return c;
1171 }
1172
1173 void connection_client_enable(
1174         Connection *c )
1175 {
1176         slapd_set_read( c->c_sd, 1 );
1177 }
1178
1179 void connection_client_stop(
1180         Connection *c )
1181 {
1182         Sockbuf *sb;
1183         ber_socket_t s = c->c_sd;
1184
1185         /* get (locked) connection */
1186         c = connection_get( s );
1187
1188         if ( !c ) return;
1189
1190         assert( c->c_conn_state == SLAP_C_CLIENT );
1191
1192         c->c_listener = NULL;
1193         c->c_conn_state = SLAP_C_INVALID;
1194         c->c_struct_state = SLAP_C_UNUSED;
1195         c->c_sd = AC_SOCKET_INVALID;
1196         c->c_close_reason = "?";                        /* should never be needed */
1197         sb = c->c_sb;
1198         c->c_sb = ber_sockbuf_alloc( );
1199         {
1200                 ber_len_t max = sockbuf_max_incoming;
1201                 ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_SET_MAX_INCOMING, &max );
1202         }
1203         slapd_remove( s, sb, 0, 1, 0 );
1204
1205         connection_return( c );
1206 }
1207
1208 static int connection_read( ber_socket_t s, conn_readinfo *cri );
1209
1210 static void* connection_read_thread( void* ctx, void* argv )
1211 {
1212         int rc ;
1213         conn_readinfo cri = { NULL, NULL, NULL, NULL, 0 };
1214         ber_socket_t s = (long)argv;
1215
1216         /*
1217          * read incoming LDAP requests. If there is more than one,
1218          * the first one is returned with new_op
1219          */
1220         cri.ctx = ctx;
1221         if( ( rc = connection_read( s, &cri ) ) < 0 ) {
1222                 Debug( LDAP_DEBUG_CONNS, "connection_read(%d) error\n", s, 0, 0 );
1223                 return (void*)(long)rc;
1224         }
1225
1226         /* execute a single queued request in the same thread */
1227         if( cri.op && !cri.nullop ) {
1228                 rc = (long)connection_operation( ctx, cri.op );
1229         } else if ( cri.func ) {
1230                 rc = (long)cri.func( ctx, cri.arg );
1231         }
1232
1233         return (void*)(long)rc;
1234 }
1235
1236 int connection_read_activate( ber_socket_t s )
1237 {
1238         int rc;
1239
1240         /*
1241          * suspend reading on this file descriptor until a connection processing
1242          * thread reads data on it. Otherwise the listener thread will repeatedly
1243          * submit the same event on it to the pool.
1244          */
1245         rc = slapd_clr_read( s, 0 );
1246         if ( rc )
1247                 return rc;
1248
1249         rc = ldap_pvt_thread_pool_submit( &connection_pool,
1250                 connection_read_thread, (void *)(long)s );
1251
1252         if( rc != 0 ) {
1253                 Debug( LDAP_DEBUG_ANY,
1254                         "connection_read_activate(%d): submit failed (%d)\n",
1255                         s, rc, 0 );
1256         }
1257
1258         return rc;
1259 }
1260
1261 void
1262 connection_hangup( ber_socket_t s )
1263 {
1264         Connection *c;
1265
1266         c = connection_get( s );
1267         if ( c ) {
1268                 connection_closing( c, "connection lost" );
1269                 connection_close( c );
1270                 connection_return( c );
1271         }
1272 }
1273
1274 static int
1275 connection_read( ber_socket_t s, conn_readinfo *cri )
1276 {
1277         int rc = 0;
1278         Connection *c;
1279
1280         assert( connections != NULL );
1281
1282         /* get (locked) connection */
1283         c = connection_get( s );
1284
1285         if( c == NULL ) {
1286                 Debug( LDAP_DEBUG_ANY,
1287                         "connection_read(%ld): no connection!\n",
1288                         (long) s, 0, 0 );
1289
1290                 return -1;
1291         }
1292
1293         c->c_n_read++;
1294
1295         if( c->c_conn_state == SLAP_C_CLOSING ) {
1296                 Debug( LDAP_DEBUG_CONNS,
1297                         "connection_read(%d): closing, ignoring input for id=%lu\n",
1298                         s, c->c_connid, 0 );
1299                 connection_return( c );
1300                 return 0;
1301         }
1302
1303         if ( c->c_conn_state == SLAP_C_CLIENT ) {
1304                 cri->func = c->c_clientfunc;
1305                 cri->arg = c->c_clientarg;
1306                 /* read should already be cleared */
1307                 connection_return( c );
1308                 return 0;
1309         }
1310
1311         Debug( LDAP_DEBUG_TRACE,
1312                 "connection_read(%d): checking for input on id=%lu\n",
1313                 s, c->c_connid, 0 );
1314
1315 #ifdef HAVE_TLS
1316         if ( c->c_is_tls && c->c_needs_tls_accept ) {
1317                 rc = ldap_pvt_tls_accept( c->c_sb, slap_tls_ctx );
1318                 if ( rc < 0 ) {
1319                         Debug( LDAP_DEBUG_TRACE,
1320                                 "connection_read(%d): TLS accept failure "
1321                                 "error=%d id=%lu, closing\n",
1322                                 s, rc, c->c_connid );
1323
1324                         c->c_needs_tls_accept = 0;
1325                         /* c_mutex is locked */
1326                         connection_closing( c, "TLS negotiation failure" );
1327                         connection_close( c );
1328                         connection_return( c );
1329                         return 0;
1330
1331                 } else if ( rc == 0 ) {
1332                         void *ssl;
1333                         struct berval authid = BER_BVNULL;
1334
1335                         c->c_needs_tls_accept = 0;
1336
1337                         /* we need to let SASL know */
1338                         ssl = ldap_pvt_tls_sb_ctx( c->c_sb );
1339
1340                         c->c_tls_ssf = (slap_ssf_t) ldap_pvt_tls_get_strength( ssl );
1341                         if( c->c_tls_ssf > c->c_ssf ) {
1342                                 c->c_ssf = c->c_tls_ssf;
1343                         }
1344
1345                         rc = dnX509peerNormalize( ssl, &authid );
1346                         if ( rc != LDAP_SUCCESS ) {
1347                                 Debug( LDAP_DEBUG_TRACE, "connection_read(%d): "
1348                                         "unable to get TLS client DN, error=%d id=%lu\n",
1349                                         s, rc, c->c_connid );
1350                         }
1351                         Statslog( LDAP_DEBUG_STATS,
1352                                 "conn=%lu fd=%d TLS established tls_ssf=%u ssf=%u\n",
1353                             c->c_connid, (int) s, c->c_tls_ssf, c->c_ssf, 0 );
1354                         slap_sasl_external( c, c->c_tls_ssf, &authid );
1355                         if ( authid.bv_val ) free( authid.bv_val );
1356                 }
1357
1358                 /* if success and data is ready, fall thru to data input loop */
1359                 if( !ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_DATA_READY, NULL ) )
1360                 {
1361                         slapd_set_read( s, 1 );
1362                         connection_return( c );
1363                         return 0;
1364                 }
1365         }
1366 #endif
1367
1368 #ifdef HAVE_CYRUS_SASL
1369         if ( c->c_sasl_layers ) {
1370                 /* If previous layer is not removed yet, give up for now */
1371                 if ( !c->c_sasl_sockctx ) {
1372                         slapd_set_read( s, 1 );
1373                         connection_return( c );
1374                         return 0;
1375                 }
1376
1377                 c->c_sasl_layers = 0;
1378
1379                 rc = ldap_pvt_sasl_install( c->c_sb, c->c_sasl_sockctx );
1380                 if( rc != LDAP_SUCCESS ) {
1381                         Debug( LDAP_DEBUG_TRACE,
1382                                 "connection_read(%d): SASL install error "
1383                                 "error=%d id=%lu, closing\n",
1384                                 s, rc, c->c_connid );
1385
1386                         /* c_mutex is locked */
1387                         connection_closing( c, "SASL layer install failure" );
1388                         connection_close( c );
1389                         connection_return( c );
1390                         return 0;
1391                 }
1392         }
1393 #endif
1394
1395 #define CONNECTION_INPUT_LOOP 1
1396 /* #define      DATA_READY_LOOP 1 */
1397
1398         do {
1399                 /* How do we do this without getting into a busy loop ? */
1400                 rc = connection_input( c, cri );
1401         }
1402 #ifdef DATA_READY_LOOP
1403         while( !rc && ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_DATA_READY, NULL ));
1404 #elif defined CONNECTION_INPUT_LOOP
1405         while(!rc);
1406 #else
1407         while(0);
1408 #endif
1409
1410         if( rc < 0 ) {
1411                 Debug( LDAP_DEBUG_CONNS,
1412                         "connection_read(%d): input error=%d id=%lu, closing.\n",
1413                         s, rc, c->c_connid );
1414
1415                 /* c_mutex is locked */
1416                 connection_closing( c, conn_lost_str );
1417                 connection_close( c );
1418                 connection_return( c );
1419                 return 0;
1420         }
1421
1422         if ( ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_NEEDS_WRITE, NULL ) ) {
1423                 slapd_set_write( s, 0 );
1424         }
1425
1426         slapd_set_read( s, 1 );
1427         connection_return( c );
1428
1429         return 0;
1430 }
1431
1432 static int
1433 connection_input( Connection *conn , conn_readinfo *cri )
1434 {
1435         Operation *op;
1436         ber_tag_t       tag;
1437         ber_len_t       len;
1438         ber_int_t       msgid;
1439         BerElement      *ber;
1440         int             rc;
1441 #ifdef LDAP_CONNECTIONLESS
1442         Sockaddr        peeraddr;
1443         char            *cdn = NULL;
1444 #endif
1445         char *defer = NULL;
1446         void *ctx;
1447
1448         if ( conn->c_currentber == NULL &&
1449                 ( conn->c_currentber = ber_alloc()) == NULL )
1450         {
1451                 Debug( LDAP_DEBUG_ANY, "ber_alloc failed\n", 0, 0, 0 );
1452                 return -1;
1453         }
1454
1455         sock_errset(0);
1456
1457 #ifdef LDAP_CONNECTIONLESS
1458         if ( conn->c_is_udp ) {
1459                 char peername[sizeof("IP=255.255.255.255:65336")];
1460
1461                 len = ber_int_sb_read(conn->c_sb, &peeraddr, sizeof(struct sockaddr));
1462                 if (len != sizeof(struct sockaddr)) return 1;
1463
1464                 sprintf( peername, "IP=%s:%d",
1465                         inet_ntoa( peeraddr.sa_in_addr.sin_addr ),
1466                         (unsigned) ntohs( peeraddr.sa_in_addr.sin_port ) );
1467                 Statslog( LDAP_DEBUG_STATS,
1468                         "conn=%lu UDP request from %s (%s) accepted.\n",
1469                         conn->c_connid, peername, conn->c_sock_name.bv_val, 0, 0 );
1470         }
1471 #endif
1472
1473         tag = ber_get_next( conn->c_sb, &len, conn->c_currentber );
1474         if ( tag != LDAP_TAG_MESSAGE ) {
1475                 int err = sock_errno();
1476
1477                 if ( err != EWOULDBLOCK && err != EAGAIN ) {
1478                         /* log, close and send error */
1479                         Debug( LDAP_DEBUG_TRACE,
1480                                 "ber_get_next on fd %d failed errno=%d (%s)\n",
1481                         conn->c_sd, err, sock_errstr(err) );
1482                         ber_free( conn->c_currentber, 1 );
1483                         conn->c_currentber = NULL;
1484
1485                         return -2;
1486                 }
1487                 return 1;
1488         }
1489
1490         ber = conn->c_currentber;
1491         conn->c_currentber = NULL;
1492
1493         if ( (tag = ber_get_int( ber, &msgid )) != LDAP_TAG_MSGID ) {
1494                 /* log, close and send error */
1495                 Debug( LDAP_DEBUG_ANY, "ber_get_int returns 0x%lx\n", tag, 0, 0 );
1496                 ber_free( ber, 1 );
1497                 return -1;
1498         }
1499
1500         if ( (tag = ber_peek_tag( ber, &len )) == LBER_ERROR ) {
1501                 /* log, close and send error */
1502                 Debug( LDAP_DEBUG_ANY, "ber_peek_tag returns 0x%lx\n", tag, 0, 0 );
1503                 ber_free( ber, 1 );
1504
1505                 return -1;
1506         }
1507
1508 #ifdef LDAP_CONNECTIONLESS
1509         if( conn->c_is_udp ) {
1510                 if( tag == LBER_OCTETSTRING ) {
1511                         ber_get_stringa( ber, &cdn );
1512                         tag = ber_peek_tag(ber, &len);
1513                 }
1514                 if( tag != LDAP_REQ_ABANDON && tag != LDAP_REQ_SEARCH ) {
1515                         Debug( LDAP_DEBUG_ANY, "invalid req for UDP 0x%lx\n", tag, 0, 0 );
1516                         ber_free( ber, 1 );
1517                         return 0;
1518                 }
1519         }
1520 #endif
1521
1522         if(tag == LDAP_REQ_BIND) {
1523                 /* immediately abandon all existing operations upon BIND */
1524                 connection_abandon( conn );
1525         }
1526
1527         ctx = cri->ctx;
1528         op = slap_op_alloc( ber, msgid, tag, conn->c_n_ops_received++, ctx );
1529
1530         op->o_conn = conn;
1531         /* clear state if the connection is being reused from inactive */
1532         if ( conn->c_conn_state == SLAP_C_INACTIVE ) {
1533                 memset( &conn->c_pagedresults_state, 0,
1534                         sizeof( conn->c_pagedresults_state ) );
1535         }
1536
1537         op->o_res_ber = NULL;
1538
1539 #ifdef LDAP_CONNECTIONLESS
1540         if (conn->c_is_udp) {
1541                 if ( cdn ) {
1542                         ber_str2bv( cdn, 0, 1, &op->o_dn );
1543                         op->o_protocol = LDAP_VERSION2;
1544                 }
1545                 op->o_res_ber = ber_alloc_t( LBER_USE_DER );
1546                 if (op->o_res_ber == NULL) return 1;
1547
1548                 rc = ber_write( op->o_res_ber, (char *)&peeraddr,
1549                         sizeof(struct sockaddr), 0 );
1550
1551                 if (rc != sizeof(struct sockaddr)) {
1552                         Debug( LDAP_DEBUG_ANY, "ber_write failed\n", 0, 0, 0 );
1553                         return 1;
1554                 }
1555
1556                 if (op->o_protocol == LDAP_VERSION2) {
1557                         rc = ber_printf(op->o_res_ber, "{is{" /*}}*/, op->o_msgid, "");
1558                         if (rc == -1) {
1559                                 Debug( LDAP_DEBUG_ANY, "ber_write failed\n", 0, 0, 0 );
1560                                 return rc;
1561                         }
1562                 }
1563         }
1564 #endif /* LDAP_CONNECTIONLESS */
1565
1566         rc = 0;
1567
1568         /* Don't process requests when the conn is in the middle of a
1569          * Bind, or if it's closing. Also, don't let any single conn
1570          * use up all the available threads, and don't execute if we're
1571          * currently blocked on output. And don't execute if there are
1572          * already pending ops, let them go first.  Abandon operations
1573          * get exceptions to some, but not all, cases.
1574          */
1575         switch( tag ){
1576         default:
1577                 /* Abandon and Unbind are exempt from these checks */
1578                 if (conn->c_conn_state == SLAP_C_CLOSING) {
1579                         defer = "closing";
1580                         break;
1581                 } else if (conn->c_writewaiter) {
1582                         defer = "awaiting write";
1583                         break;
1584                 } else if (conn->c_n_ops_pending) {
1585                         defer = "pending operations";
1586                         break;
1587                 }
1588                 /* FALLTHRU */
1589         case LDAP_REQ_ABANDON:
1590                 /* Unbind is exempt from these checks */
1591                 if (conn->c_n_ops_executing >= connection_pool_max/2) {
1592                         defer = "too many executing";
1593                         break;
1594                 } else if (conn->c_conn_state == SLAP_C_BINDING) {
1595                         defer = "binding";
1596                         break;
1597                 }
1598                 /* FALLTHRU */
1599         case LDAP_REQ_UNBIND:
1600                 break;
1601         }
1602
1603         if( defer ) {
1604                 int max = conn->c_dn.bv_len
1605                         ? slap_conn_max_pending_auth
1606                         : slap_conn_max_pending;
1607
1608                 Debug( LDAP_DEBUG_ANY,
1609                         "connection_input: conn=%lu deferring operation: %s\n",
1610                         conn->c_connid, defer, 0 );
1611                 conn->c_n_ops_pending++;
1612                 LDAP_STAILQ_INSERT_TAIL( &conn->c_pending_ops, op, o_next );
1613                 rc = ( conn->c_n_ops_pending > max ) ? -1 : 0;
1614
1615         } else {
1616                 conn->c_n_ops_executing++;
1617
1618                 /*
1619                  * The first op will be processed in the same thread context,
1620                  * as long as there is only one op total.
1621                  * Subsequent ops will be submitted to the pool by
1622                  * calling connection_op_activate()
1623                  */
1624                 if ( cri->op == NULL ) {
1625                         /* the first incoming request */
1626                         connection_op_queue( op );
1627                         cri->op = op;
1628                 } else {
1629                         if ( !cri->nullop ) {
1630                                 cri->nullop = 1;
1631                                 rc = ldap_pvt_thread_pool_submit( &connection_pool,
1632                                         connection_operation, (void *) cri->op );
1633                         }
1634                         connection_op_activate( op );
1635                 }
1636         }
1637
1638 #ifdef NO_THREADS
1639         if ( conn->c_struct_state != SLAP_C_USED ) {
1640                 /* connection must have got closed underneath us */
1641                 return 1;
1642         }
1643 #endif
1644
1645         assert( conn->c_struct_state == SLAP_C_USED );
1646         return rc;
1647 }
1648
1649 static int
1650 connection_resched( Connection *conn )
1651 {
1652         Operation *op;
1653
1654         if( conn->c_writewaiter )
1655                 return 0;
1656
1657         if( conn->c_conn_state == SLAP_C_CLOSING ) {
1658                 Debug( LDAP_DEBUG_CONNS, "connection_resched: "
1659                         "attempting closing conn=%lu sd=%d\n",
1660                         conn->c_connid, conn->c_sd, 0 );
1661                 connection_close( conn );
1662                 return 0;
1663         }
1664
1665         if( conn->c_conn_state != SLAP_C_ACTIVE ) {
1666                 /* other states need different handling */
1667                 return 0;
1668         }
1669
1670         while ((op = LDAP_STAILQ_FIRST( &conn->c_pending_ops )) != NULL) {
1671                 if ( conn->c_n_ops_executing > connection_pool_max/2 ) break;
1672
1673                 LDAP_STAILQ_REMOVE_HEAD( &conn->c_pending_ops, o_next );
1674                 LDAP_STAILQ_NEXT(op, o_next) = NULL;
1675
1676                 /* pending operations should not be marked for abandonment */
1677                 assert(!op->o_abandon);
1678
1679                 conn->c_n_ops_pending--;
1680                 conn->c_n_ops_executing++;
1681
1682                 connection_op_activate( op );
1683
1684                 if ( conn->c_conn_state == SLAP_C_BINDING ) break;
1685         }
1686         return 0;
1687 }
1688
1689 static void
1690 connection_init_log_prefix( Operation *op )
1691 {
1692         if ( op->o_connid == (unsigned long)(-1) ) {
1693                 snprintf( op->o_log_prefix, sizeof( op->o_log_prefix ),
1694                         "conn=-1 op=%lu", op->o_opid );
1695
1696         } else {
1697                 snprintf( op->o_log_prefix, sizeof( op->o_log_prefix ),
1698                         "conn=%lu op=%lu", op->o_connid, op->o_opid );
1699         }
1700 }
1701
1702 static int connection_bind_cleanup_cb( Operation *op, SlapReply *rs )
1703 {
1704         op->o_conn->c_sasl_bindop = NULL;
1705
1706         ch_free( op->o_callback );
1707         op->o_callback = NULL;
1708
1709         return SLAP_CB_CONTINUE;
1710 }
1711
1712 static int connection_bind_cb( Operation *op, SlapReply *rs )
1713 {
1714         ldap_pvt_thread_mutex_lock( &op->o_conn->c_mutex );
1715         if ( op->o_conn->c_conn_state == SLAP_C_BINDING )
1716                 op->o_conn->c_conn_state = SLAP_C_ACTIVE;
1717         op->o_conn->c_sasl_bind_in_progress =
1718                 ( rs->sr_err == LDAP_SASL_BIND_IN_PROGRESS );
1719
1720         /* Moved here from bind.c due to ITS#4158 */
1721         op->o_conn->c_sasl_bindop = NULL;
1722         if ( op->orb_method == LDAP_AUTH_SASL ) {
1723                 if( rs->sr_err == LDAP_SUCCESS ) {
1724                         ber_dupbv(&op->o_conn->c_dn, &op->orb_edn);
1725                         if( !BER_BVISEMPTY( &op->orb_edn ) ) {
1726                                 /* edn is always normalized already */
1727                                 ber_dupbv( &op->o_conn->c_ndn, &op->o_conn->c_dn );
1728                         }
1729                         op->o_tmpfree( op->orb_edn.bv_val, op->o_tmpmemctx );
1730                         BER_BVZERO( &op->orb_edn );
1731                         op->o_conn->c_authmech = op->o_conn->c_sasl_bind_mech;
1732                         BER_BVZERO( &op->o_conn->c_sasl_bind_mech );
1733
1734                         op->o_conn->c_sasl_ssf = op->orb_ssf;
1735                         if( op->orb_ssf > op->o_conn->c_ssf ) {
1736                                 op->o_conn->c_ssf = op->orb_ssf;
1737                         }
1738
1739                         if( !BER_BVISEMPTY( &op->o_conn->c_dn ) ) {
1740                                 ber_len_t max = sockbuf_max_incoming_auth;
1741                                 ber_sockbuf_ctrl( op->o_conn->c_sb,
1742                                         LBER_SB_OPT_SET_MAX_INCOMING, &max );
1743                         }
1744
1745                         /* log authorization identity */
1746                         Statslog( LDAP_DEBUG_STATS,
1747                                 "%s BIND dn=\"%s\" mech=%s sasl_ssf=%d ssf=%d\n",
1748                                 op->o_log_prefix,
1749                                 BER_BVISNULL( &op->o_conn->c_dn ) ? "<empty>" : op->o_conn->c_dn.bv_val,
1750                                 op->o_conn->c_authmech.bv_val,
1751                                 op->orb_ssf, op->o_conn->c_ssf );
1752
1753                         Debug( LDAP_DEBUG_TRACE,
1754                                 "do_bind: SASL/%s bind: dn=\"%s\" sasl_ssf=%d\n",
1755                                 op->o_conn->c_authmech.bv_val,
1756                                 BER_BVISNULL( &op->o_conn->c_dn ) ? "<empty>" : op->o_conn->c_dn.bv_val,
1757                                 op->orb_ssf );
1758
1759                 } else if ( rs->sr_err != LDAP_SASL_BIND_IN_PROGRESS ) {
1760                         if ( !BER_BVISNULL( &op->o_conn->c_sasl_bind_mech ) ) {
1761                                 free( op->o_conn->c_sasl_bind_mech.bv_val );
1762                                 BER_BVZERO( &op->o_conn->c_sasl_bind_mech );
1763                         }
1764                 }
1765         }
1766         ldap_pvt_thread_mutex_unlock( &op->o_conn->c_mutex );
1767
1768         ch_free( op->o_callback );
1769         op->o_callback = NULL;
1770
1771         return SLAP_CB_CONTINUE;
1772 }
1773
1774 static void connection_op_queue( Operation *op )
1775 {
1776         ber_tag_t tag = op->o_tag;
1777
1778         if (tag == LDAP_REQ_BIND) {
1779                 slap_callback *sc = ch_calloc( 1, sizeof( slap_callback ));
1780                 sc->sc_response = connection_bind_cb;
1781                 sc->sc_cleanup = connection_bind_cleanup_cb;
1782                 sc->sc_next = op->o_callback;
1783                 op->o_callback = sc;
1784                 op->o_conn->c_conn_state = SLAP_C_BINDING;
1785         }
1786
1787         if (!op->o_dn.bv_len) {
1788                 op->o_authz = op->o_conn->c_authz;
1789                 if ( BER_BVISNULL( &op->o_conn->c_sasl_authz_dn )) {
1790                         ber_dupbv( &op->o_dn, &op->o_conn->c_dn );
1791                         ber_dupbv( &op->o_ndn, &op->o_conn->c_ndn );
1792                 } else {
1793                         ber_dupbv( &op->o_dn, &op->o_conn->c_sasl_authz_dn );
1794                         ber_dupbv( &op->o_ndn, &op->o_conn->c_sasl_authz_dn );
1795                 }
1796         }
1797
1798         op->o_authtype = op->o_conn->c_authtype;
1799         ber_dupbv( &op->o_authmech, &op->o_conn->c_authmech );
1800
1801         if (!op->o_protocol) {
1802                 op->o_protocol = op->o_conn->c_protocol
1803                         ? op->o_conn->c_protocol : LDAP_VERSION3;
1804         }
1805
1806         if (op->o_conn->c_conn_state == SLAP_C_INACTIVE &&
1807                 op->o_protocol > LDAP_VERSION2)
1808         {
1809                 op->o_conn->c_conn_state = SLAP_C_ACTIVE;
1810         }
1811
1812         op->o_connid = op->o_conn->c_connid;
1813         connection_init_log_prefix( op );
1814
1815         LDAP_STAILQ_INSERT_TAIL( &op->o_conn->c_ops, op, o_next );
1816 }
1817
1818 static int connection_op_activate( Operation *op )
1819 {
1820         int rc;
1821
1822         connection_op_queue( op );
1823
1824         rc = ldap_pvt_thread_pool_submit( &connection_pool,
1825                 connection_operation, (void *) op );
1826
1827         if ( rc != 0 ) {
1828                 Debug( LDAP_DEBUG_ANY,
1829                         "connection_op_activate: submit failed (%d) for conn=%lu\n",
1830                         rc, op->o_connid, 0 );
1831                 /* should move op to pending list */
1832         }
1833
1834         return rc;
1835 }
1836
1837 int connection_write(ber_socket_t s)
1838 {
1839         Connection *c;
1840         Operation *op;
1841
1842         assert( connections != NULL );
1843
1844         slapd_clr_write( s, 0 );
1845
1846         c = connection_get( s );
1847         if( c == NULL ) {
1848                 Debug( LDAP_DEBUG_ANY,
1849                         "connection_write(%ld): no connection!\n",
1850                         (long)s, 0, 0 );
1851                 return -1;
1852         }
1853
1854         c->c_n_write++;
1855
1856         Debug( LDAP_DEBUG_TRACE,
1857                 "connection_write(%d): waking output for id=%lu\n",
1858                 s, c->c_connid, 0 );
1859         ldap_pvt_thread_cond_signal( &c->c_write2_cv );
1860
1861         if ( ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_NEEDS_READ, NULL ) ) {
1862                 slapd_set_read( s, 1 );
1863         }
1864         if ( ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_NEEDS_WRITE, NULL ) ) {
1865                 slapd_set_write( s, 1 );
1866         }
1867
1868         /* If there are ops pending because of a writewaiter,
1869          * start one up.
1870          */
1871         while ((op = LDAP_STAILQ_FIRST( &c->c_pending_ops )) != NULL) {
1872                 if ( !c->c_writewaiter ) break;
1873                 if ( c->c_n_ops_executing > connection_pool_max/2 ) break;
1874
1875                 LDAP_STAILQ_REMOVE_HEAD( &c->c_pending_ops, o_next );
1876                 LDAP_STAILQ_NEXT(op, o_next) = NULL;
1877
1878                 /* pending operations should not be marked for abandonment */
1879                 assert(!op->o_abandon);
1880
1881                 c->c_n_ops_pending--;
1882                 c->c_n_ops_executing++;
1883
1884                 connection_op_activate( op );
1885
1886                 break;
1887         }
1888
1889         connection_return( c );
1890         return 0;
1891 }
1892
1893 #ifdef LDAP_SLAPI
1894 typedef struct conn_fake_extblock {
1895         void *eb_conn;
1896         void *eb_op;
1897 } conn_fake_extblock;
1898
1899 static void
1900 connection_fake_destroy(
1901         void *key,
1902         void *data )
1903 {
1904         Connection conn = {0};
1905         Operation op = {0};
1906         Opheader ohdr = {0};
1907
1908         conn_fake_extblock *eb = data;
1909
1910         op.o_hdr = &ohdr;
1911         op.o_hdr->oh_extensions = eb->eb_op;
1912         conn.c_extensions = eb->eb_conn;
1913         op.o_conn = &conn;
1914         conn.c_connid = -1;
1915         op.o_connid = -1;
1916
1917         ber_memfree_x( eb, NULL );
1918         slapi_int_free_object_extensions( SLAPI_X_EXT_OPERATION, &op );
1919         slapi_int_free_object_extensions( SLAPI_X_EXT_CONNECTION, &conn );
1920 }
1921 #endif
1922
1923 void
1924 connection_fake_init(
1925         Connection *conn,
1926         OperationBuffer *opbuf,
1927         void *ctx )
1928 {
1929         connection_fake_init2( conn, opbuf, ctx, 1 );
1930 }
1931
1932 void
1933 operation_fake_init(
1934         Connection *conn,
1935         Operation *op,
1936         void *ctx,
1937         int newmem )
1938 {
1939         /* set memory context */
1940         op->o_tmpmemctx = slap_sl_mem_create(SLAP_SLAB_SIZE, SLAP_SLAB_STACK, ctx,
1941                 newmem );
1942         op->o_tmpmfuncs = &slap_sl_mfuncs;
1943         op->o_threadctx = ctx;
1944         op->o_tid = ldap_pvt_thread_pool_tid( ctx );
1945
1946         op->o_counters = &slap_counters;
1947         op->o_conn = conn;
1948         op->o_connid = op->o_conn->c_connid;
1949         connection_init_log_prefix( op );
1950 }
1951
1952
1953 void
1954 connection_fake_init2(
1955         Connection *conn,
1956         OperationBuffer *opbuf,
1957         void *ctx,
1958         int newmem )
1959 {
1960         Operation *op = (Operation *) opbuf;
1961
1962         conn->c_connid = -1;
1963         conn->c_conn_idx = -1;
1964         conn->c_send_ldap_result = slap_send_ldap_result;
1965         conn->c_send_search_entry = slap_send_search_entry;
1966         conn->c_send_search_reference = slap_send_search_reference;
1967         conn->c_listener = (Listener *)&dummy_list;
1968         conn->c_peer_domain = slap_empty_bv;
1969         conn->c_peer_name = slap_empty_bv;
1970
1971         memset( opbuf, 0, sizeof( *opbuf ));
1972         op->o_hdr = &opbuf->ob_hdr;
1973         op->o_controls = opbuf->ob_controls;
1974
1975         operation_fake_init( conn, op, ctx, newmem );
1976
1977 #ifdef LDAP_SLAPI
1978         if ( slapi_plugins_used ) {
1979                 conn_fake_extblock *eb;
1980                 void *ebx = NULL;
1981
1982                 /* Use thread keys to make sure these eventually get cleaned up */
1983                 if ( ldap_pvt_thread_pool_getkey( ctx, (void *)connection_fake_init,
1984                                 &ebx, NULL )) {
1985                         eb = ch_malloc( sizeof( *eb ));
1986                         slapi_int_create_object_extensions( SLAPI_X_EXT_CONNECTION, conn );
1987                         slapi_int_create_object_extensions( SLAPI_X_EXT_OPERATION, op );
1988                         eb->eb_conn = conn->c_extensions;
1989                         eb->eb_op = op->o_hdr->oh_extensions;
1990                         ldap_pvt_thread_pool_setkey( ctx, (void *)connection_fake_init,
1991                                 eb, connection_fake_destroy, NULL, NULL );
1992                 } else {
1993                         eb = ebx;
1994                         conn->c_extensions = eb->eb_conn;
1995                         op->o_hdr->oh_extensions = eb->eb_op;
1996                 }
1997         }
1998 #endif /* LDAP_SLAPI */
1999
2000         slap_op_time( &op->o_time, &op->o_tincr );
2001 }
2002
2003 void
2004 connection_assign_nextid( Connection *conn )
2005 {
2006         ldap_pvt_thread_mutex_lock( &conn_nextid_mutex );
2007         conn->c_connid = conn_nextid++;
2008         ldap_pvt_thread_mutex_unlock( &conn_nextid_mutex );
2009 }