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 1998-2005 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 #ifdef SLAP_MULTI_CONN_ARRAY
  47 /* for Multiple Connection Arrary (MCA) Support */
  48 static ldap_pvt_thread_mutex_t* connections_mutex;
  49 static Connection **connections = NULL;
  50
  51 /* set to the number of processors (round up to a power of 2) */
  52 #       define NUM_CONNECTION_ARRAY 4
  53
  54 /* partition the array in a modulo manner */
  55 #       define MCA_conn_array_id(fd)            ((int)(fd)%NUM_CONNECTION_ARRAY)
  56 #       define MCA_conn_array_element_id(fd)    ((int)(fd)/NUM_CONNECTION_ARRAY)
  57 #       define MCA_ARRAY_SIZE                   ((int)(MCA_conn_array_element_id(dtblsize) + (MCA_conn_array_id(dtblsize) ? 1 : 0)))
  58 #       define MCA_conn_check(fd)               (dtblsize > 0 && (fd) >= 0 && (fd) < (MCA_ARRAY_SIZE*NUM_CONNECTION_ARRAY))
  59 #       define MCA_GET_CONNECTION(fd) (&(connections[MCA_conn_array_id(fd)]) \
  60                 [MCA_conn_array_element_id(fd)])
  61 #       define MCA_GET_CONN_MUTEX(fd) (&connections_mutex[MCA_conn_array_id(fd)])
  62
  63 #else
  64 /* protected by connections_mutex */
  65 static ldap_pvt_thread_mutex_t connections_mutex;
  66 static Connection *connections = NULL;
  67
  68 #       define MCA_conn_check(fd)               (dtblsize > 0 && (fd) < dtblsize)
  69 #       define MCA_GET_CONNECTION(fd) (&connections[s])
  70 #       define MCA_GET_CONN_MUTEX(fd) (&connections_mutex)
  71 #endif
  72
  73 static ldap_pvt_thread_mutex_t conn_nextid_mutex;
  74 static unsigned long conn_nextid = 0;
  75
  76 static const char conn_lost_str[] = "connection lost";
  77
  78 /* structure state (protected by connections_mutex) */
  79 #define SLAP_C_UNINITIALIZED    0x00    /* MUST BE ZERO (0) */
  80 #define SLAP_C_UNUSED                   0x01
  81 #define SLAP_C_USED                             0x02
  82
  83 /* connection state (protected by c_mutex ) */
  84 #define SLAP_C_INVALID                  0x00    /* MUST BE ZERO (0) */
  85 #define SLAP_C_INACTIVE                 0x01    /* zero threads */
  86 #define SLAP_C_ACTIVE                   0x02    /* one or more threads */
  87 #define SLAP_C_BINDING                  0x03    /* binding */
  88 #define SLAP_C_CLOSING                  0x04    /* closing */
  89 #define SLAP_C_CLIENT                   0x05    /* outbound client conn */
  90
  91 const char *
  92 connection_state2str( int state )
  93 {
  94         switch( state ) {
  95         case SLAP_C_INVALID:    return "!";
  96         case SLAP_C_INACTIVE:   return "|";
  97         case SLAP_C_ACTIVE:             return "";
  98         case SLAP_C_BINDING:    return "B";
  99         case SLAP_C_CLOSING:    return "C";
 100         case SLAP_C_CLIENT:             return "L";
 101         }
 102
 103         return "?";
 104 }
 105
 106 static Connection* connection_get( ber_socket_t s );
 107
 108 #ifdef SLAP_LIGHTWEIGHT_DISPATCHER
 109 static int connection_input( Connection *c, Operation** op );
 110 #else
 111 static int connection_input( Connection *c );
 112 #endif
 113 static void connection_close( Connection *c );
 114
 115 static int connection_op_activate( Operation *op );
 116 #ifdef SLAP_LIGHTWEIGHT_DISPATCHER
 117 static void connection_op_queue( Operation *op );
 118 #endif
 119 static int connection_resched( Connection *conn );
 120 static void connection_abandon( Connection *conn );
 121 static void connection_destroy( Connection *c );
 122
 123 static ldap_pvt_thread_start_t connection_operation;
 124
 125 /*
 126  * Initialize connection management infrastructure.
 127  */
 128 int connections_init(void)
 129 #ifdef SLAP_MULTI_CONN_ARRAY
 130 {
 131         int             i, j;
 132         Connection*     conn;
 133
 134         assert( connections == NULL );
 135
 136         if( connections != NULL) {
 137                 Debug( LDAP_DEBUG_ANY, "connections_init: already initialized.\n",
 138                         0, 0, 0 );
 139                 return -1;
 140         }
 141
 142         connections_mutex = (ldap_pvt_thread_mutex_t*) ch_calloc(
 143                 NUM_CONNECTION_ARRAY, sizeof(ldap_pvt_thread_mutex_t) );
 144         if( connections_mutex == NULL ) {
 145                 Debug( LDAP_DEBUG_ANY, "connections_init: "
 146                         "allocation of connection mutex[%d] failed\n", i, 0, 0 );
 147                 return -1;
 148         }
 149
 150         connections = (Connection**) ch_calloc(
 151                 NUM_CONNECTION_ARRAY, sizeof(Connection*));
 152         if( connections == NULL ) {
 153                 Debug( LDAP_DEBUG_ANY, "connections_init: "
 154                         "allocation of connection[%d] failed\n", 0, 0, 0 );
 155                 return -1;
 156         }
 157
 158         for ( i = 0; i < NUM_CONNECTION_ARRAY; i++ ) {
 159                 ldap_pvt_thread_mutex_init( connections_mutex+i );
 160                 connections[i] = (Connection*) ch_calloc(
 161                         MCA_ARRAY_SIZE, sizeof(Connection) );
 162                 if( connections[i] == NULL ) {
 163                         Debug( LDAP_DEBUG_ANY, "connections_init: "
 164                                 "allocation (%d*%ld) of connection array[%d] failed\n",
 165                                 dtblsize, (long) sizeof(Connection), i );
 166                         return -1;
 167                 }
 168         }
 169
 170         /* should check return of every call */
 171         ldap_pvt_thread_mutex_init( &conn_nextid_mutex );
 172
 173         assert( connections[0]->c_struct_state == SLAP_C_UNINITIALIZED );
 174         assert( connections[NUM_CONNECTION_ARRAY-1]->c_struct_state ==
 175                 SLAP_C_UNINITIALIZED );
 176
 177         for ( i = 0; i < NUM_CONNECTION_ARRAY; i++ ) {
 178                 conn = connections[i];
 179                 for ( j = 0; j < MCA_ARRAY_SIZE; j++ ) {
 180                         conn[j].c_conn_idx = j;
 181                 }
 182         }
 183
 184         /*
 185          * per entry initialization of the Connection array initialization
 186          * will be done by connection_init()
 187          */
 188
 189         return 0;
 190 }
 191 #else
 192 {
 193         int i;
 194
 195         assert( connections == NULL );
 196
 197         if( connections != NULL) {
 198                 Debug( LDAP_DEBUG_ANY, "connections_init: already initialized.\n",
 199                         0, 0, 0 );
 200                 return -1;
 201         }
 202
 203         /* should check return of every call */
 204         ldap_pvt_thread_mutex_init( &connections_mutex );
 205         ldap_pvt_thread_mutex_init( &conn_nextid_mutex );
 206
 207         connections = (Connection *) ch_calloc( dtblsize, sizeof(Connection) );
 208
 209         if( connections == NULL ) {
 210                 Debug( LDAP_DEBUG_ANY, "connections_init: "
 211                         "allocation (%d*%ld) of connection array failed\n",
 212                         dtblsize, (long) sizeof(Connection), 0 );
 213                 return -1;
 214         }
 215
 216         assert( connections[0].c_struct_state == SLAP_C_UNINITIALIZED );
 217         assert( connections[dtblsize-1].c_struct_state == SLAP_C_UNINITIALIZED );
 218
 219         for (i=0; i<dtblsize; i++) connections[i].c_conn_idx = i;
 220
 221         /*
 222          * per entry initialization of the Connection array initialization
 223          * will be done by connection_init()
 224          */
 225
 226         return 0;
 227 }
 228 #endif
 229
 230 /*
 231  * Destroy connection management infrastructure.
 232  */
 233
 234 int connections_destroy(void)
 235 #ifdef SLAP_MULTI_CONN_ARRAY
 236 {
 237         int i;
 238         ber_socket_t j;
 239
 240         if( connections == NULL) {
 241                 Debug( LDAP_DEBUG_ANY, "connections_destroy: nothing to destroy.\n",
 242                         0, 0, 0 );
 243                 return -1;
 244         }
 245
 246     for ( i = 0; i < NUM_CONNECTION_ARRAY; i++ ) {
 247                 Connection* conn = connections[i];
 248                 for ( j = 0; j < MCA_ARRAY_SIZE; j++ ) {
 249                         if( conn[j].c_struct_state != SLAP_C_UNINITIALIZED ) {
 250                                 ber_sockbuf_free( conn[j].c_sb );
 251                                 ldap_pvt_thread_mutex_destroy( &conn[j].c_mutex );
 252                                 ldap_pvt_thread_mutex_destroy( &conn[j].c_write_mutex );
 253                                 ldap_pvt_thread_cond_destroy( &conn[j].c_write_cv );
 254 #ifdef LDAP_SLAPI
 255                                 /* FIX ME!! */
 256                                 if ( slapi_plugins_used ) {
 257                                         slapi_int_free_object_extensions( SLAPI_X_EXT_CONNECTION,
 258                                                 &connections[i] );
 259                                 }
 260 #endif
 261                         }
 262                 }
 263         }
 264
 265         for ( i = 0; i < NUM_CONNECTION_ARRAY; i++ ) {
 266                 free( connections[i] );
 267                 connections[i] = NULL;
 268                 ldap_pvt_thread_mutex_destroy( &connections_mutex[i] );
 269         }
 270
 271         ldap_pvt_thread_mutex_destroy( &conn_nextid_mutex );
 272
 273         return 0;
 274
 275 }
 276 #else
 277 {
 278         ber_socket_t i;
 279
 280         /* should check return of every call */
 281
 282         if( connections == NULL) {
 283                 Debug( LDAP_DEBUG_ANY, "connections_destroy: nothing to destroy.\n",
 284                         0, 0, 0 );
 285                 return -1;
 286         }
 287
 288         for ( i = 0; i < dtblsize; i++ ) {
 289                 if( connections[i].c_struct_state != SLAP_C_UNINITIALIZED ) {
 290                         ber_sockbuf_free( connections[i].c_sb );
 291                         ldap_pvt_thread_mutex_destroy( &connections[i].c_mutex );
 292                         ldap_pvt_thread_mutex_destroy( &connections[i].c_write_mutex );
 293                         ldap_pvt_thread_cond_destroy( &connections[i].c_write_cv );
 294 #ifdef LDAP_SLAPI
 295                         if ( slapi_plugins_used ) {
 296                                 slapi_int_free_object_extensions( SLAPI_X_EXT_CONNECTION,
 297                                         &connections[i] );
 298                         }
 299 #endif
 300                 }
 301         }
 302
 303         free( connections );
 304         connections = NULL;
 305
 306         ldap_pvt_thread_mutex_destroy( &connections_mutex );
 307         ldap_pvt_thread_mutex_destroy( &conn_nextid_mutex );
 308         return 0;
 309 }
 310 #endif
 311
 312 /*
 313  * shutdown all connections
 314  */
 315 int connections_shutdown(void)
 316 #ifdef SLAP_MULTI_CONN_ARRAY
 317 {
 318         int i;
 319         ber_socket_t j;
 320
 321         for ( i = 0; i < NUM_CONNECTION_ARRAY; i++ ) {
 322                 Connection* conn = connections[i];
 323                 ldap_pvt_thread_mutex_lock( &connections_mutex[i] );
 324                 for ( j = 0; j < MCA_ARRAY_SIZE; j++ ) {
 325                         if( conn[j].c_struct_state != SLAP_C_USED ) {
 326                                 continue;
 327                         }
 328                         /* give persistent clients a chance to cleanup */
 329                         if( conn[j].c_conn_state == SLAP_C_CLIENT ) {
 330                                 ldap_pvt_thread_pool_submit( &connection_pool,
 331                                 conn[j].c_clientfunc, conn[j].c_clientarg );
 332                                 continue;
 333                         }
 334
 335                         ldap_pvt_thread_mutex_lock( &conn[j].c_mutex );
 336                         /* connections_mutex and c_mutex are locked */
 337                         connection_closing( &conn[j], "connection shutdown" );
 338                         connection_close( &conn[j] );
 339                         ldap_pvt_thread_mutex_unlock( &conn[j].c_mutex );
 340                 }
 341
 342                 ldap_pvt_thread_mutex_unlock( &connections_mutex[i] );
 343         }
 344
 345         return 0;
 346
 347 }
 348 #else
 349 {
 350         ber_socket_t i;
 351
 352         ldap_pvt_thread_mutex_lock( &connections_mutex );
 353
 354         for ( i = 0; i < dtblsize; i++ ) {
 355                 if( connections[i].c_struct_state != SLAP_C_USED ) {
 356                         continue;
 357                 }
 358                 /* give persistent clients a chance to cleanup */
 359                 if( connections[i].c_conn_state == SLAP_C_CLIENT ) {
 360                         ldap_pvt_thread_pool_submit( &connection_pool,
 361                         connections[i].c_clientfunc, connections[i].c_clientarg );
 362                         continue;
 363                 }
 364
 365                 ldap_pvt_thread_mutex_lock( &connections[i].c_mutex );
 366
 367                 /* connections_mutex and c_mutex are locked */
 368                 connection_closing( &connections[i], "slapd shutdown" );
 369                 connection_close( &connections[i] );
 370
 371                 ldap_pvt_thread_mutex_unlock( &connections[i].c_mutex );
 372         }
 373
 374         ldap_pvt_thread_mutex_unlock( &connections_mutex );
 375
 376         return 0;
 377 }
 378 #endif
 379
 380 /*
 381  * Timeout idle connections.
 382  */
 383 int connections_timeout_idle(time_t now)
 384 {
 385         int i = 0;
 386         int connindex;
 387         Connection* c;
 388
 389         for( c = connection_first( &connindex );
 390                 c != NULL;
 391                 c = connection_next( c, &connindex ) )
 392         {
 393                 /* Don't timeout a slow-running request or a persistent
 394                  * outbound connection */
 395                 if( c->c_n_ops_executing || c->c_conn_state == SLAP_C_CLIENT ) {
 396                         continue;
 397                 }
 398
 399                 if( difftime( c->c_activitytime+global_idletimeout, now) < 0 ) {
 400                         /* close it */
 401                         connection_closing( c, "idletimeout" );
 402                         connection_close( c );
 403                         i++;
 404                 }
 405         }
 406         connection_done( c );
 407
 408         return i;
 409 }
 410
 411 static Connection* connection_get( ber_socket_t s )
 412 {
 413         /* connections_mutex should be locked by caller */
 414
 415         Connection *c;
 416
 417         Debug( LDAP_DEBUG_ARGS,
 418                 "connection_get(%ld)\n",
 419                 (long) s, 0, 0 );
 420
 421         assert( connections != NULL );
 422
 423         if(s == AC_SOCKET_INVALID) return NULL;
 424
 425 #ifndef HAVE_WINSOCK
 426         assert( MCA_conn_check( s ) );
 427         c = MCA_GET_CONNECTION(s);
 428
 429         assert( c->c_struct_state != SLAP_C_UNINITIALIZED );
 430
 431 #else
 432         c = NULL;
 433         {
 434                 ber_socket_t i, sd;
 435
 436                 for(i=0; i<dtblsize; i++) {
 437                         if( connections[i].c_struct_state == SLAP_C_UNINITIALIZED ) {
 438                                 assert( connections[i].c_conn_state == SLAP_C_INVALID );
 439                                 assert( connections[i].c_sb == 0 );
 440                                 break;
 441                         }
 442
 443                         ber_sockbuf_ctrl( connections[i].c_sb,
 444                                 LBER_SB_OPT_GET_FD, &sd );
 445
 446                         if( connections[i].c_struct_state == SLAP_C_UNUSED ) {
 447                                 assert( connections[i].c_conn_state == SLAP_C_INVALID );
 448                                 assert( sd == AC_SOCKET_INVALID );
 449                                 continue;
 450                         }
 451
 452                         /* state can actually change from used -> unused by resched,
 453                          * so don't assert details here.
 454                          */
 455
 456                         if( sd == s ) {
 457                                 c = &connections[i];
 458                                 break;
 459                         }
 460                 }
 461         }
 462 #endif
 463
 464         if( c != NULL ) {
 465                 ber_socket_t    sd;
 466
 467                 ldap_pvt_thread_mutex_lock( &c->c_mutex );
 468
 469                 ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_GET_FD, &sd );
 470                 if( c->c_struct_state != SLAP_C_USED ) {
 471                         /* connection must have been closed due to resched */
 472
 473                         assert( c->c_conn_state == SLAP_C_INVALID );
 474                         assert( sd == AC_SOCKET_INVALID );
 475
 476                         Debug( LDAP_DEBUG_TRACE,
 477                                 "connection_get(%d): connection not used\n",
 478                                 s, 0, 0 );
 479
 480                         ldap_pvt_thread_mutex_unlock( &c->c_mutex );
 481                         return NULL;
 482                 }
 483
 484                 Debug( LDAP_DEBUG_TRACE,
 485                         "connection_get(%d): got connid=%lu\n",
 486                         s, c->c_connid, 0 );
 487
 488                 c->c_n_get++;
 489
 490                 assert( c->c_struct_state == SLAP_C_USED );
 491                 assert( c->c_conn_state != SLAP_C_INVALID );
 492                 assert( sd != AC_SOCKET_INVALID );
 493
 494 #ifndef SLAPD_MONITOR
 495                 if ( global_idletimeout > 0 )
 496 #endif /* ! SLAPD_MONITOR */
 497                 {
 498                         c->c_activitytime = slap_get_time();
 499                 }
 500         }
 501
 502         return c;
 503 }
 504
 505 static void connection_return( Connection *c )
 506 {
 507         ldap_pvt_thread_mutex_unlock( &c->c_mutex );
 508 }
 509
 510 long connection_init(
 511         ber_socket_t s,
 512         Listener *listener,
 513         const char* dnsname,
 514         const char* peername,
 515         int flags,
 516         slap_ssf_t ssf,
 517         struct berval *authid )
 518 {
 519         unsigned long id;
 520         Connection *c;
 521
 522         assert( connections != NULL );
 523
 524         assert( listener != NULL );
 525         assert( dnsname != NULL );
 526         assert( peername != NULL );
 527
 528 #ifndef HAVE_TLS
 529         assert( flags != CONN_IS_TLS );
 530 #endif
 531
 532         if( s == AC_SOCKET_INVALID ) {
 533                 Debug( LDAP_DEBUG_ANY,
 534                         "connection_init: init of socket %ld invalid.\n", (long)s, 0, 0 );
 535                 return -1;
 536         }
 537
 538         assert( s >= 0 );
 539 #ifndef HAVE_WINSOCK
 540         assert( s < dtblsize );
 541 #endif
 542
 543         ldap_pvt_thread_mutex_lock( MCA_GET_CONN_MUTEX(s) );
 544
 545 #ifndef HAVE_WINSOCK
 546         assert( MCA_conn_check( s ) );
 547         c = MCA_GET_CONNECTION(s);
 548 #else
 549         {
 550                 ber_socket_t i;
 551                 c = NULL;
 552
 553                 for( i=0; i < dtblsize; i++) {
 554                         ber_socket_t    sd;
 555
 556                         if( connections[i].c_struct_state == SLAP_C_UNINITIALIZED ) {
 557                                 assert( connections[i].c_sb == 0 );
 558                                 c = &connections[i];
 559                                 break;
 560                         }
 561
 562                         sd = AC_SOCKET_INVALID;
 563                         if (connections[i].c_sb != NULL) {
 564                                 ber_sockbuf_ctrl( connections[i].c_sb,
 565                                         LBER_SB_OPT_GET_FD, &sd );
 566                         }
 567
 568                         if( connections[i].c_struct_state == SLAP_C_UNUSED ) {
 569                                 assert( sd == AC_SOCKET_INVALID );
 570                                 c = &connections[i];
 571                                 break;
 572                         }
 573
 574                         if( connections[i].c_conn_state == SLAP_C_CLIENT ) continue;
 575
 576                         assert( connections[i].c_struct_state == SLAP_C_USED );
 577                         assert( connections[i].c_conn_state != SLAP_C_INVALID );
 578                         assert( sd != AC_SOCKET_INVALID );
 579                 }
 580
 581                 if( c == NULL ) {
 582                         Debug( LDAP_DEBUG_ANY,
 583                                 "connection_init(%d): connection table full "
 584                                 "(%d/%d)\n", s, i, dtblsize);
 585                         ldap_pvt_thread_mutex_unlock( &connections_mutex );
 586                         return -1;
 587                 }
 588         }
 589 #endif
 590
 591         assert( c != NULL );
 592
 593         if( c->c_struct_state == SLAP_C_UNINITIALIZED ) {
 594                 c->c_send_ldap_result = slap_send_ldap_result;
 595                 c->c_send_search_entry = slap_send_search_entry;
 596                 c->c_send_search_reference = slap_send_search_reference;
 597                 c->c_send_ldap_extended = slap_send_ldap_extended;
 598 #ifdef LDAP_RES_INTERMEDIATE
 599                 c->c_send_ldap_intermediate = slap_send_ldap_intermediate;
 600 #endif
 601
 602                 BER_BVZERO( &c->c_authmech );
 603                 BER_BVZERO( &c->c_dn );
 604                 BER_BVZERO( &c->c_ndn );
 605
 606                 c->c_listener = NULL;
 607                 BER_BVZERO( &c->c_peer_domain );
 608                 BER_BVZERO( &c->c_peer_name );
 609
 610                 LDAP_STAILQ_INIT(&c->c_ops);
 611                 LDAP_STAILQ_INIT(&c->c_pending_ops);
 612
 613                 BER_BVZERO( &c->c_sasl_bind_mech );
 614                 c->c_sasl_done = 0;
 615                 c->c_sasl_authctx = NULL;
 616                 c->c_sasl_sockctx = NULL;
 617                 c->c_sasl_extra = NULL;
 618                 c->c_sasl_bindop = NULL;
 619
 620                 c->c_sb = ber_sockbuf_alloc( );
 621
 622                 {
 623                         ber_len_t max = sockbuf_max_incoming;
 624                         ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_SET_MAX_INCOMING, &max );
 625                 }
 626
 627                 c->c_currentber = NULL;
 628
 629                 /* should check status of thread calls */
 630                 ldap_pvt_thread_mutex_init( &c->c_mutex );
 631                 ldap_pvt_thread_mutex_init( &c->c_write_mutex );
 632                 ldap_pvt_thread_cond_init( &c->c_write_cv );
 633
 634 #ifdef LDAP_SLAPI
 635                 if ( slapi_plugins_used ) {
 636                         slapi_int_create_object_extensions( SLAPI_X_EXT_CONNECTION, c );
 637                 }
 638 #endif
 639
 640                 c->c_struct_state = SLAP_C_UNUSED;
 641         }
 642
 643         ldap_pvt_thread_mutex_lock( &c->c_mutex );
 644
 645         assert( c->c_struct_state == SLAP_C_UNUSED );
 646         assert( BER_BVISNULL( &c->c_authmech ) );
 647         assert( BER_BVISNULL( &c->c_dn ) );
 648         assert( BER_BVISNULL( &c->c_ndn ) );
 649         assert( c->c_listener == NULL );
 650         assert( BER_BVISNULL( &c->c_peer_domain ) );
 651         assert( BER_BVISNULL( &c->c_peer_name ) );
 652         assert( LDAP_STAILQ_EMPTY(&c->c_ops) );
 653         assert( LDAP_STAILQ_EMPTY(&c->c_pending_ops) );
 654         assert( BER_BVISNULL( &c->c_sasl_bind_mech ) );
 655         assert( c->c_sasl_done == 0 );
 656         assert( c->c_sasl_authctx == NULL );
 657         assert( c->c_sasl_sockctx == NULL );
 658         assert( c->c_sasl_extra == NULL );
 659         assert( c->c_sasl_bindop == NULL );
 660         assert( c->c_currentber == NULL );
 661         assert( c->c_writewaiter == 0);
 662
 663         c->c_listener = listener;
 664
 665         if ( flags == CONN_IS_CLIENT ) {
 666                 c->c_conn_state = SLAP_C_CLIENT;
 667                 c->c_struct_state = SLAP_C_USED;
 668                 c->c_close_reason = "?";                        /* should never be needed */
 669                 ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_SET_FD, &s );
 670                 ldap_pvt_thread_mutex_unlock( &c->c_mutex );
 671                 ldap_pvt_thread_mutex_unlock( MCA_GET_CONN_MUTEX(s) );
 672
 673                 return 0;
 674         }
 675
 676         ber_str2bv( dnsname, 0, 1, &c->c_peer_domain );
 677         ber_str2bv( peername, 0, 1, &c->c_peer_name );
 678
 679         c->c_n_ops_received = 0;
 680         c->c_n_ops_executing = 0;
 681         c->c_n_ops_pending = 0;
 682         c->c_n_ops_completed = 0;
 683
 684         c->c_n_get = 0;
 685         c->c_n_read = 0;
 686         c->c_n_write = 0;
 687
 688         /* set to zero until bind, implies LDAP_VERSION3 */
 689         c->c_protocol = 0;
 690
 691 #ifndef SLAPD_MONITOR
 692         if ( global_idletimeout > 0 )
 693 #endif /* ! SLAPD_MONITOR */
 694         {
 695                 c->c_activitytime = c->c_starttime = slap_get_time();
 696         }
 697
 698 #ifdef LDAP_CONNECTIONLESS
 699         c->c_is_udp = 0;
 700         if( flags == CONN_IS_UDP ) {
 701                 c->c_is_udp = 1;
 702 #ifdef LDAP_DEBUG
 703                 ber_sockbuf_add_io( c->c_sb, &ber_sockbuf_io_debug,
 704                         LBER_SBIOD_LEVEL_PROVIDER, (void*)"udp_" );
 705 #endif
 706                 ber_sockbuf_add_io( c->c_sb, &ber_sockbuf_io_udp,
 707                         LBER_SBIOD_LEVEL_PROVIDER, (void *)&s );
 708                 ber_sockbuf_add_io( c->c_sb, &ber_sockbuf_io_readahead,
 709                         LBER_SBIOD_LEVEL_PROVIDER, NULL );
 710         } else
 711 #endif
 712         {
 713 #ifdef LDAP_DEBUG
 714                 ber_sockbuf_add_io( c->c_sb, &ber_sockbuf_io_debug,
 715                         LBER_SBIOD_LEVEL_PROVIDER, (void*)"tcp_" );
 716 #endif
 717                 ber_sockbuf_add_io( c->c_sb, &ber_sockbuf_io_tcp,
 718                         LBER_SBIOD_LEVEL_PROVIDER, (void *)&s );
 719         }
 720
 721 #ifdef LDAP_DEBUG
 722         ber_sockbuf_add_io( c->c_sb, &ber_sockbuf_io_debug,
 723                 INT_MAX, (void*)"ldap_" );
 724 #endif
 725
 726         if( ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_SET_NONBLOCK,
 727                 c /* non-NULL */ ) < 0 )
 728         {
 729                 Debug( LDAP_DEBUG_ANY,
 730                         "connection_init(%d, %s): set nonblocking failed\n",
 731                         s, c->c_peer_name.bv_val, 0 );
 732         }
 733
 734         ldap_pvt_thread_mutex_lock( &conn_nextid_mutex );
 735         id = c->c_connid = conn_nextid++;
 736         ldap_pvt_thread_mutex_unlock( &conn_nextid_mutex );
 737
 738         c->c_conn_state = SLAP_C_INACTIVE;
 739         c->c_struct_state = SLAP_C_USED;
 740         c->c_close_reason = "?";                        /* should never be needed */
 741
 742         c->c_ssf = c->c_transport_ssf = ssf;
 743         c->c_tls_ssf = 0;
 744
 745 #ifdef HAVE_TLS
 746         if ( flags == CONN_IS_TLS ) {
 747                 c->c_is_tls = 1;
 748                 c->c_needs_tls_accept = 1;
 749         } else {
 750                 c->c_is_tls = 0;
 751                 c->c_needs_tls_accept = 0;
 752         }
 753 #endif
 754
 755         slap_sasl_open( c, 0 );
 756         slap_sasl_external( c, ssf, authid );
 757
 758         slapd_add_internal( s, 1 );
 759         ldap_pvt_thread_mutex_unlock( &c->c_mutex );
 760         ldap_pvt_thread_mutex_unlock( MCA_GET_CONN_MUTEX(s) );
 761
 762         backend_connection_init(c);
 763
 764         return id;
 765 }
 766
 767 void connection2anonymous( Connection *c )
 768 {
 769         assert( connections != NULL );
 770         assert( c != NULL );
 771
 772         {
 773                 ber_len_t max = sockbuf_max_incoming;
 774                 ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_SET_MAX_INCOMING, &max );
 775         }
 776
 777         if ( !BER_BVISNULL( &c->c_authmech ) ) {
 778                 ch_free(c->c_authmech.bv_val);
 779         }
 780         BER_BVZERO( &c->c_authmech );
 781
 782         if ( !BER_BVISNULL( &c->c_dn ) ) {
 783                 ch_free(c->c_dn.bv_val);
 784         }
 785         BER_BVZERO( &c->c_dn );
 786
 787         if ( !BER_BVISNULL( &c->c_ndn ) ) {
 788                 ch_free(c->c_ndn.bv_val);
 789         }
 790         BER_BVZERO( &c->c_ndn );
 791
 792         if ( !BER_BVISNULL( &c->c_sasl_authz_dn ) ) {
 793                 ber_memfree_x( c->c_sasl_authz_dn.bv_val, NULL );
 794         }
 795         BER_BVZERO( &c->c_sasl_authz_dn );
 796
 797         c->c_authz_backend = NULL;
 798 }
 799
 800 static void
 801 connection_destroy( Connection *c )
 802 {
 803         /* note: connections_mutex should be locked by caller */
 804         ber_socket_t    sd;
 805         unsigned long   connid;
 806         const char              *close_reason;
 807
 808         assert( connections != NULL );
 809         assert( c != NULL );
 810         assert( c->c_struct_state != SLAP_C_UNUSED );
 811         assert( c->c_conn_state != SLAP_C_INVALID );
 812         assert( LDAP_STAILQ_EMPTY(&c->c_ops) );
 813         assert( c->c_writewaiter == 0);
 814
 815         /* only for stats (print -1 as "%lu" may give unexpected results ;) */
 816         connid = c->c_connid;
 817         close_reason = c->c_close_reason;
 818
 819         backend_connection_destroy(c);
 820
 821         c->c_protocol = 0;
 822         c->c_connid = -1;
 823
 824         c->c_activitytime = c->c_starttime = 0;
 825
 826         connection2anonymous( c );
 827         c->c_listener = NULL;
 828
 829         if(c->c_peer_domain.bv_val != NULL) {
 830                 free(c->c_peer_domain.bv_val);
 831         }
 832         BER_BVZERO( &c->c_peer_domain );
 833         if(c->c_peer_name.bv_val != NULL) {
 834                 free(c->c_peer_name.bv_val);
 835         }
 836         BER_BVZERO( &c->c_peer_name );
 837
 838         c->c_sasl_bind_in_progress = 0;
 839         if(c->c_sasl_bind_mech.bv_val != NULL) {
 840                 free(c->c_sasl_bind_mech.bv_val);
 841         }
 842         BER_BVZERO( &c->c_sasl_bind_mech );
 843
 844         slap_sasl_close( c );
 845
 846         if ( c->c_currentber != NULL ) {
 847                 ber_free( c->c_currentber, 1 );
 848                 c->c_currentber = NULL;
 849         }
 850
 851         ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_GET_FD, &sd );
 852         slapd_sd_lock();
 853         ber_sockbuf_free( c->c_sb );
 854         if ( sd != AC_SOCKET_INVALID ) {
 855                 slapd_remove( sd, 1, 0, 1 );
 856
 857                 Statslog( LDAP_DEBUG_STATS, (close_reason
 858                                                                          ? "conn=%lu fd=%ld closed (%s)\n"
 859                                                                          : "conn=%lu fd=%ld closed\n"),
 860                         connid, (long) sd, close_reason, 0, 0 );
 861         } else {
 862                 slapd_sd_unlock();
 863         }
 864
 865         c->c_sb = ber_sockbuf_alloc( );
 866
 867         {
 868                 ber_len_t max = sockbuf_max_incoming;
 869                 ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_SET_MAX_INCOMING, &max );
 870         }
 871
 872         c->c_conn_state = SLAP_C_INVALID;
 873         c->c_struct_state = SLAP_C_UNUSED;
 874         c->c_close_reason = "?";                        /* should never be needed */
 875
 876 #ifdef LDAP_SLAPI
 877         /* call destructors, then constructors; avoids unnecessary allocation */
 878         if ( slapi_plugins_used ) {
 879                 slapi_int_clear_object_extensions( SLAPI_X_EXT_CONNECTION, c );
 880         }
 881 #endif
 882 }
 883
 884 int connection_state_closing( Connection *c )
 885 {
 886         /* c_mutex must be locked by caller */
 887
 888         int state;
 889         assert( c != NULL );
 890         assert( c->c_struct_state == SLAP_C_USED );
 891
 892         state = c->c_conn_state;
 893
 894         assert( state != SLAP_C_INVALID );
 895
 896         return state == SLAP_C_CLOSING;
 897 }
 898
 899 static void connection_abandon( Connection *c )
 900 {
 901         /* c_mutex must be locked by caller */
 902
 903         Operation *o, *next, op = {0};
 904         Opheader ohdr = {0};
 905         SlapReply rs = {0};
 906
 907         op.o_hdr = &ohdr;
 908         op.o_conn = c;
 909         op.o_connid = c->c_connid;
 910         op.o_tag = LDAP_REQ_ABANDON;
 911         for ( o = LDAP_STAILQ_FIRST( &c->c_ops ); o; o=next ) {
 912                 next = LDAP_STAILQ_NEXT( o, o_next );
 913                 op.orn_msgid = o->o_msgid;
 914                 o->o_abandon = 1;
 915                 op.o_bd = frontendDB;
 916                 frontendDB->be_abandon( &op, &rs );
 917         }
 918
 919         /* remove pending operations */
 920         while ( (o = LDAP_STAILQ_FIRST( &c->c_pending_ops )) != NULL) {
 921                 LDAP_STAILQ_REMOVE_HEAD( &c->c_pending_ops, o_next );
 922                 LDAP_STAILQ_NEXT(o, o_next) = NULL;
 923                 slap_op_free( o );
 924         }
 925 }
 926
 927 void connection_closing( Connection *c, const char *why )
 928 {
 929         assert( connections != NULL );
 930         assert( c != NULL );
 931         assert( c->c_struct_state == SLAP_C_USED );
 932         assert( c->c_conn_state != SLAP_C_INVALID );
 933
 934         /* c_mutex must be locked by caller */
 935
 936         if( c->c_conn_state != SLAP_C_CLOSING ) {
 937                 ber_socket_t    sd;
 938
 939                 ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_GET_FD, &sd );
 940                 Debug( LDAP_DEBUG_TRACE,
 941                         "connection_closing: readying conn=%lu sd=%d for close\n",
 942                         c->c_connid, sd, 0 );
 943                 /* update state to closing */
 944                 c->c_conn_state = SLAP_C_CLOSING;
 945                 c->c_close_reason = why;
 946
 947                 /* don't listen on this port anymore */
 948                 slapd_clr_read( sd, 1 );
 949
 950                 /* abandon active operations */
 951                 connection_abandon( c );
 952
 953                 /* wake write blocked operations */
 954                 slapd_clr_write( sd, 1 );
 955                 if ( c->c_writewaiter ) {
 956                         ldap_pvt_thread_cond_signal( &c->c_write_cv );
 957                         ldap_pvt_thread_mutex_unlock( &c->c_mutex );
 958                         ldap_pvt_thread_yield();
 959                         ldap_pvt_thread_mutex_lock( &c->c_mutex );
 960                 }
 961         } else if( why == NULL && c->c_close_reason == conn_lost_str ) {
 962                 /* Client closed connection after doing Unbind. */
 963                 c->c_close_reason = NULL;
 964         }
 965 }
 966
 967 static void connection_close( Connection *c )
 968 {
 969         ber_socket_t    sd;
 970
 971         assert( connections != NULL );
 972         assert( c != NULL );
 973         assert( c->c_struct_state == SLAP_C_USED );
 974         assert( c->c_conn_state == SLAP_C_CLOSING );
 975
 976         /* note: connections_mutex and c_mutex should be locked by caller */
 977
 978         ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_GET_FD, &sd );
 979         if( !LDAP_STAILQ_EMPTY(&c->c_ops) ) {
 980                 Debug( LDAP_DEBUG_TRACE,
 981                         "connection_close: deferring conn=%lu sd=%d\n",
 982                         c->c_connid, sd, 0 );
 983                 return;
 984         }
 985
 986         Debug( LDAP_DEBUG_TRACE, "connection_close: conn=%lu sd=%d\n",
 987                 c->c_connid, sd, 0 );
 988         connection_destroy( c );
 989 }
 990
 991 unsigned long connections_nextid(void)
 992 {
 993         unsigned long id;
 994         assert( connections != NULL );
 995
 996         ldap_pvt_thread_mutex_lock( &conn_nextid_mutex );
 997
 998         id = conn_nextid;
 999
1000         ldap_pvt_thread_mutex_unlock( &conn_nextid_mutex );
1001
1002         return id;
1003 }
1004
1005 Connection* connection_first( ber_socket_t *index )
1006 {
1007 #ifdef SLAP_MULTI_CONN_ARRAY
1008         int conn_array_id;
1009 #endif
1010
1011         assert( connections != NULL );
1012         assert( index != NULL );
1013
1014 #ifdef SLAP_MULTI_CONN_ARRAY
1015         for ( conn_array_id = 0;
1016                 conn_array_id < NUM_CONNECTION_ARRAY;
1017                 conn_array_id++ )
1018         {
1019                 ldap_pvt_thread_mutex_lock( &connections_mutex[ conn_array_id ] );
1020         }
1021 #else
1022         ldap_pvt_thread_mutex_lock( &connections_mutex );
1023 #endif
1024
1025         *index = 0;
1026
1027         return connection_next(NULL, index);
1028 }
1029
1030 Connection* connection_next( Connection *c, ber_socket_t *index )
1031 #ifdef SLAP_MULTI_CONN_ARRAY
1032 {
1033         Connection* conn;
1034
1035         assert( connections != NULL );
1036         assert( index != NULL );
1037         assert( *index >= 0 && *index < MCA_ARRAY_SIZE );
1038
1039         if( c != NULL ) ldap_pvt_thread_mutex_unlock( &c->c_mutex );
1040
1041         c = NULL;
1042
1043         for(; *index < dtblsize; (*index)++) {
1044                 assert( MCA_conn_check( *index ) );
1045                 conn = MCA_GET_CONNECTION(*index);
1046                 if( conn->c_struct_state == SLAP_C_UNINITIALIZED ) {
1047                         assert( conn->c_conn_state == SLAP_C_INVALID );
1048 #ifndef HAVE_WINSOCK
1049                         continue;
1050 #else
1051                         break;
1052 #endif
1053                 }
1054
1055                 if( conn->c_struct_state == SLAP_C_USED ) {
1056                         assert( conn->c_conn_state != SLAP_C_INVALID );
1057                         c = conn;
1058                         (*index)++;
1059                         break;
1060                 }
1061
1062                 assert( conn->c_struct_state == SLAP_C_UNUSED );
1063                 assert( conn->c_conn_state == SLAP_C_INVALID );
1064         }
1065
1066         if( c != NULL ) ldap_pvt_thread_mutex_lock( &c->c_mutex );
1067
1068         return c;
1069
1070 }
1071 #else
1072 {
1073         assert( connections != NULL );
1074         assert( index != NULL );
1075         assert( *index <= dtblsize );
1076
1077         if( c != NULL ) ldap_pvt_thread_mutex_unlock( &c->c_mutex );
1078
1079         c = NULL;
1080
1081         for(; *index < dtblsize; (*index)++) {
1082                 if( connections[*index].c_struct_state == SLAP_C_UNINITIALIZED ) {
1083                         assert( connections[*index].c_conn_state == SLAP_C_INVALID );
1084 #ifndef HAVE_WINSOCK
1085                         continue;
1086 #else
1087                         break;
1088 #endif
1089                 }
1090
1091                 if( connections[*index].c_struct_state == SLAP_C_USED ) {
1092                         assert( connections[*index].c_conn_state != SLAP_C_INVALID );
1093                         c = &connections[(*index)++];
1094                         break;
1095                 }
1096
1097                 assert( connections[*index].c_struct_state == SLAP_C_UNUSED );
1098                 assert( connections[*index].c_conn_state == SLAP_C_INVALID );
1099         }
1100
1101         if( c != NULL ) ldap_pvt_thread_mutex_lock( &c->c_mutex );
1102         return c;
1103 }
1104 #endif
1105
1106 void connection_done( Connection *c )
1107 {
1108 #ifdef SLAP_MULTI_CONN_ARRAY
1109         int conn_array_id;
1110 #endif
1111
1112         assert( connections != NULL );
1113
1114         if( c != NULL ) ldap_pvt_thread_mutex_unlock( &c->c_mutex );
1115
1116 #ifdef SLAP_MULTI_CONN_ARRAY
1117         for ( conn_array_id = 0;
1118                 conn_array_id < NUM_CONNECTION_ARRAY;
1119                 conn_array_id++ )
1120         {
1121                 ldap_pvt_thread_mutex_unlock( &connections_mutex[ conn_array_id ] );
1122         }
1123 #else
1124         ldap_pvt_thread_mutex_unlock( &connections_mutex );
1125 #endif
1126 }
1127
1128 /*
1129  * connection_activity - handle the request operation op on connection
1130  * conn.  This routine figures out what kind of operation it is and
1131  * calls the appropriate stub to handle it.
1132  */
1133
1134 #ifdef SLAPD_MONITOR
1135 /* FIXME: returns 0 in case of failure */
1136 #define INCR_OP_INITIATED(index) \
1137         do { \
1138                 ldap_pvt_thread_mutex_lock( &slap_counters.sc_ops_mutex ); \
1139                 ldap_pvt_mp_add_ulong(slap_counters.sc_ops_initiated_[(index)], 1); \
1140                 ldap_pvt_thread_mutex_unlock( &slap_counters.sc_ops_mutex ); \
1141         } while (0)
1142 #define INCR_OP_COMPLETED(index) \
1143         do { \
1144                 ldap_pvt_thread_mutex_lock( &slap_counters.sc_ops_mutex ); \
1145                 ldap_pvt_mp_add_ulong(slap_counters.sc_ops_completed, 1); \
1146                 ldap_pvt_mp_add_ulong(slap_counters.sc_ops_completed_[(index)], 1); \
1147                 ldap_pvt_thread_mutex_unlock( &slap_counters.sc_ops_mutex ); \
1148         } while (0)
1149 #else /* !SLAPD_MONITOR */
1150 #define INCR_OP_INITIATED(index) do { } while (0)
1151 #define INCR_OP_COMPLETED(index) \
1152         do { \
1153                 ldap_pvt_thread_mutex_lock( &slap_counters.sc_ops_mutex ); \
1154                 ldap_pvt_mp_add_ulong(slap_counters.sc_ops_completed, 1); \
1155                 ldap_pvt_thread_mutex_unlock( &slap_counters.sc_ops_mutex ); \
1156         } while (0)
1157 #endif /* !SLAPD_MONITOR */
1158
1159 /*
1160  * NOTE: keep in sync with enum in slapd.h
1161  */
1162 static int (*opfun[])( Operation *op, SlapReply *rs ) = {
1163         do_bind,
1164         do_unbind,
1165         do_add,
1166         do_delete,
1167         do_modrdn,
1168         do_modify,
1169         do_compare,
1170         do_search,
1171         do_abandon,
1172         do_extended,
1173         NULL
1174 };
1175
1176 static void *
1177 connection_operation( void *ctx, void *arg_v )
1178 {
1179         int rc = LDAP_OTHER;
1180         Operation *op = arg_v;
1181         SlapReply rs = {REP_RESULT};
1182         ber_tag_t tag = op->o_tag;
1183         int opidx = -1;
1184         Connection *conn = op->o_conn;
1185         void *memctx = NULL;
1186         void *memctx_null = NULL;
1187         ber_len_t memsiz;
1188
1189         ldap_pvt_thread_mutex_lock( &slap_counters.sc_ops_mutex );
1190         /* FIXME: returns 0 in case of failure */
1191         ldap_pvt_mp_add_ulong(slap_counters.sc_ops_initiated, 1);
1192         ldap_pvt_thread_mutex_unlock( &slap_counters.sc_ops_mutex );
1193
1194         op->o_threadctx = ctx;
1195
1196         switch ( tag ) {
1197         case LDAP_REQ_BIND:
1198         case LDAP_REQ_UNBIND:
1199         case LDAP_REQ_ADD:
1200         case LDAP_REQ_DELETE:
1201         case LDAP_REQ_MODDN:
1202         case LDAP_REQ_MODIFY:
1203         case LDAP_REQ_COMPARE:
1204         case LDAP_REQ_SEARCH:
1205         case LDAP_REQ_ABANDON:
1206         case LDAP_REQ_EXTENDED:
1207                 break;
1208         default:
1209                 Debug( LDAP_DEBUG_ANY, "connection_operation: "
1210                         "conn %lu unknown LDAP request 0x%lx\n",
1211                         conn->c_connid, tag, 0 );
1212                 op->o_tag = LBER_ERROR;
1213                 rs.sr_err = LDAP_PROTOCOL_ERROR;
1214                 rs.sr_text = "unknown LDAP request";
1215                 send_ldap_disconnect( op, &rs );
1216                 rc = SLAPD_DISCONNECT;
1217                 goto operations_error;
1218         }
1219
1220         if( conn->c_sasl_bind_in_progress && tag != LDAP_REQ_BIND ) {
1221                 Debug( LDAP_DEBUG_ANY, "connection_operation: "
1222                         "error: SASL bind in progress (tag=%ld).\n",
1223                         (long) tag, 0, 0 );
1224                 send_ldap_error( op, &rs, LDAP_OPERATIONS_ERROR,
1225                         "SASL bind in progress" );
1226                 rc = LDAP_OPERATIONS_ERROR;
1227                 goto operations_error;
1228         }
1229
1230         /* We can use Thread-Local storage for most mallocs. We can
1231          * also use TL for ber parsing, but not on Add or Modify.
1232          */
1233 #if 0
1234         memsiz = ber_len( op->o_ber ) * 64;
1235         if ( SLAP_SLAB_SIZE > memsiz ) memsiz = SLAP_SLAB_SIZE;
1236 #endif
1237         memsiz = SLAP_SLAB_SIZE;
1238
1239         memctx = slap_sl_mem_create( memsiz, SLAP_SLAB_STACK, ctx );
1240         op->o_tmpmemctx = memctx;
1241         op->o_tmpmfuncs = &slap_sl_mfuncs;
1242         if ( tag != LDAP_REQ_ADD && tag != LDAP_REQ_MODIFY ) {
1243                 /* Note - the ber and its buffer are already allocated from
1244                  * regular memory; this only affects subsequent mallocs that
1245                  * ber_scanf may invoke.
1246                  */
1247                 ber_set_option( op->o_ber, LBER_OPT_BER_MEMCTX, &memctx );
1248         }
1249
1250         switch ( tag ) {
1251         case LDAP_REQ_BIND:
1252                 opidx = SLAP_OP_BIND;
1253                 break;
1254
1255         case LDAP_REQ_UNBIND:
1256                 opidx = SLAP_OP_UNBIND;
1257                 break;
1258
1259         case LDAP_REQ_ADD:
1260                 opidx = SLAP_OP_ADD;
1261                 break;
1262
1263         case LDAP_REQ_DELETE:
1264                 opidx = SLAP_OP_DELETE;
1265                 break;
1266
1267         case LDAP_REQ_MODRDN:
1268                 opidx = SLAP_OP_MODRDN;
1269                 break;
1270
1271         case LDAP_REQ_MODIFY:
1272                 opidx = SLAP_OP_MODIFY;
1273                 break;
1274
1275         case LDAP_REQ_COMPARE:
1276                 opidx = SLAP_OP_COMPARE;
1277                 break;
1278
1279         case LDAP_REQ_SEARCH:
1280                 opidx = SLAP_OP_SEARCH;
1281                 break;
1282
1283         case LDAP_REQ_ABANDON:
1284                 opidx = SLAP_OP_ABANDON;
1285                 break;
1286
1287         case LDAP_REQ_EXTENDED:
1288                 opidx = SLAP_OP_EXTENDED;
1289                 break;
1290
1291         default:
1292                 /* not reachable */
1293                 assert( 0 );
1294         }
1295
1296         assert( opidx > -1 );
1297         INCR_OP_INITIATED( opidx );
1298         rc = (*(opfun[opidx]))( op, &rs );
1299
1300 operations_error:
1301         if ( rc == SLAPD_DISCONNECT ) {
1302                 tag = LBER_ERROR;
1303
1304         } else if ( opidx > -1 ) {
1305                 /* increment completed operations count
1306                  * only if operation was initiated
1307                  * and rc != SLAPD_DISCONNECT */
1308                 INCR_OP_COMPLETED( opidx );
1309         }
1310
1311         if ( op->o_cancel == SLAP_CANCEL_REQ ) {
1312                 if ( rc == SLAPD_ABANDON ) {
1313                         op->o_cancel = SLAP_CANCEL_ACK;
1314                 } else {
1315                         op->o_cancel = LDAP_TOO_LATE;
1316                 }
1317         }
1318         while ( op->o_cancel != SLAP_CANCEL_NONE &&
1319                 op->o_cancel != SLAP_CANCEL_DONE )
1320         {
1321                 ldap_pvt_thread_yield();
1322         }
1323
1324         ldap_pvt_thread_mutex_lock( &conn->c_mutex );
1325
1326         ber_set_option( op->o_ber, LBER_OPT_BER_MEMCTX, &memctx_null );
1327
1328         LDAP_STAILQ_REMOVE( &conn->c_ops, op, slap_op, o_next);
1329         LDAP_STAILQ_NEXT(op, o_next) = NULL;
1330         slap_op_free( op );
1331         conn->c_n_ops_executing--;
1332         conn->c_n_ops_completed++;
1333
1334         switch( tag ) {
1335         case LBER_ERROR:
1336         case LDAP_REQ_UNBIND:
1337                 /* c_mutex is locked */
1338                 connection_closing( conn,
1339                         tag == LDAP_REQ_UNBIND ? NULL : "operations error" );
1340                 break;
1341         }
1342
1343         connection_resched( conn );
1344         ldap_pvt_thread_mutex_unlock( &conn->c_mutex );
1345         return NULL;
1346 }
1347
1348 static const Listener dummy_list = { BER_BVC(""), BER_BVC("") };
1349
1350 int connection_client_setup(
1351         ber_socket_t s,
1352         ldap_pvt_thread_start_t *func,
1353         void *arg )
1354 {
1355         int rc;
1356         Connection *c;
1357
1358         rc = connection_init( s, (Listener *)&dummy_list, "", "",
1359                 CONN_IS_CLIENT, 0, NULL );
1360         if ( rc < 0 ) return -1;
1361
1362         c = connection_get( s );
1363         c->c_clientfunc = func;
1364         c->c_clientarg = arg;
1365
1366         slapd_add_internal( s, 0 );
1367         slapd_set_read( s, 1 );
1368         connection_return( c );
1369         return 0;
1370 }
1371
1372 void connection_client_enable(
1373         ber_socket_t s )
1374 {
1375         slapd_set_read( s, 1 );
1376 }
1377
1378 void connection_client_stop(
1379         ber_socket_t s )
1380 {
1381         Connection *c;
1382
1383         /* get (locked) connection */
1384         c = connection_get( s );
1385
1386         assert( c->c_conn_state == SLAP_C_CLIENT );
1387
1388         c->c_listener = NULL;
1389         c->c_conn_state = SLAP_C_INVALID;
1390         c->c_struct_state = SLAP_C_UNUSED;
1391         c->c_close_reason = "?";                        /* should never be needed */
1392         slapd_sd_lock();
1393         ber_sockbuf_free( c->c_sb );
1394         slapd_remove( s, 0, 1, 1 );
1395         c->c_sb = ber_sockbuf_alloc( );
1396         {
1397                 ber_len_t max = sockbuf_max_incoming;
1398                 ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_SET_MAX_INCOMING, &max );
1399         }
1400
1401         connection_return( c );
1402 }
1403
1404 #ifdef SLAP_LIGHTWEIGHT_DISPATCHER
1405 static int connection_read( ber_socket_t s, Operation** op );
1406
1407 static void* connection_read_thread( void* ctx, void* argv )
1408 {
1409         int rc ;
1410         Operation* new_op = NULL;
1411         ber_socket_t s = (long)argv;
1412
1413         /*
1414          * read incoming LDAP requests. If there is more than one,
1415          * the first one is returned with new_op
1416          */
1417         if( ( rc = connection_read( s, &new_op ) ) < 0 ) {
1418                 Debug( LDAP_DEBUG_CONNS, "connection_read(%d) error\n", s, 0, 0 );
1419                 return (void*)(long)rc;
1420         }
1421
1422         /* execute the queued request in the same thread */
1423         if( new_op ) {
1424                 rc = (long)connection_operation( ctx, new_op );
1425         }
1426
1427         return (void*)(long)rc;
1428 }
1429
1430 int connection_read_activate( ber_socket_t s )
1431 {
1432         int rc;
1433
1434         /*
1435          * suspend reading on this file descriptor until a connection processing
1436          * thread reads data on it. Otherwise the listener thread will repeatedly
1437          * submit the same event on it to the pool.
1438          */
1439         rc = slapd_clr_read( s, 0 );
1440         if ( rc )
1441                 return rc;
1442
1443         rc = ldap_pvt_thread_pool_submit( &connection_pool,
1444                 connection_read_thread, (void *)(long)s );
1445
1446         if( rc != 0 ) {
1447                 Debug( LDAP_DEBUG_ANY,
1448                         "connection_read_activate(%d): submit failed (%d)\n",
1449                         s, rc, 0 );
1450         }
1451
1452         return rc;
1453 }
1454 #endif
1455
1456 #ifdef SLAP_LIGHTWEIGHT_DISPATCHER
1457 static int
1458 connection_read( ber_socket_t s, Operation** op )
1459 #else
1460 int connection_read(ber_socket_t s)
1461 #endif
1462 {
1463         int rc = 0;
1464         Connection *c;
1465
1466         assert( connections != NULL );
1467
1468         ldap_pvt_thread_mutex_lock( MCA_GET_CONN_MUTEX(s) );
1469
1470         /* get (locked) connection */
1471         c = connection_get( s );
1472
1473         if( c == NULL ) {
1474                 Debug( LDAP_DEBUG_ANY,
1475                         "connection_read(%ld): no connection!\n",
1476                         (long) s, 0, 0 );
1477
1478                 ldap_pvt_thread_mutex_unlock( MCA_GET_CONN_MUTEX(s) );
1479                 return -1;
1480         }
1481
1482         c->c_n_read++;
1483
1484         if( c->c_conn_state == SLAP_C_CLOSING ) {
1485                 Debug( LDAP_DEBUG_TRACE,
1486                         "connection_read(%d): closing, ignoring input for id=%lu\n",
1487                         s, c->c_connid, 0 );
1488
1489 #ifdef SLAP_LIGHTWEIGHT_DISPATCHER
1490                 slapd_set_read( s, 1 );
1491 #endif
1492                 connection_return( c );
1493                 ldap_pvt_thread_mutex_unlock( MCA_GET_CONN_MUTEX(s) );
1494                 return 0;
1495         }
1496
1497         if ( c->c_conn_state == SLAP_C_CLIENT ) {
1498 #ifdef SLAP_LIGHTWEIGHT_DISPATCHER
1499                 /* read should already be cleared */
1500 #else
1501                 slapd_clr_read( s, 0 );
1502 #endif
1503                 ldap_pvt_thread_pool_submit( &connection_pool,
1504                         c->c_clientfunc, c->c_clientarg );
1505
1506                 connection_return( c );
1507                 ldap_pvt_thread_mutex_unlock( MCA_GET_CONN_MUTEX(s) );
1508                 return 0;
1509         }
1510
1511         Debug( LDAP_DEBUG_TRACE,
1512                 "connection_read(%d): checking for input on id=%lu\n",
1513                 s, c->c_connid, 0 );
1514
1515 #ifdef HAVE_TLS
1516         if ( c->c_is_tls && c->c_needs_tls_accept ) {
1517                 rc = ldap_pvt_tls_accept( c->c_sb, slap_tls_ctx );
1518                 if ( rc < 0 ) {
1519                         Debug( LDAP_DEBUG_TRACE,
1520                                 "connection_read(%d): TLS accept failure "
1521                                 "error=%d id=%lu, closing\n",
1522                                 s, rc, c->c_connid );
1523
1524                         c->c_needs_tls_accept = 0;
1525                         /* connections_mutex and c_mutex are locked */
1526                         connection_closing( c, "TLS negotiation failure" );
1527
1528 #if 0
1529                         {
1530                                 struct timeval tv;
1531                                 fd_set rfd;
1532                                 /* Drain input before close, to allow SSL error codes
1533                                  * to propagate to client. */
1534                                 FD_ZERO(&rfd);
1535                                 FD_SET(s, &rfd);
1536                                 for (rc=1; rc>0;) {
1537                                         tv.tv_sec = 1;
1538                                         tv.tv_usec = 0;
1539                                         rc = select(s+1, &rfd, NULL, NULL, &tv);
1540                                         if (rc == 1) {
1541                                                 ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_DRAIN, NULL);
1542                                         }
1543                                 }
1544                         }
1545 #endif
1546
1547                         connection_close( c );
1548                         connection_return( c );
1549                         ldap_pvt_thread_mutex_unlock( MCA_GET_CONN_MUTEX(s) );
1550                         return 0;
1551
1552                 } else if ( rc == 0 ) {
1553                         void *ssl;
1554                         struct berval authid = BER_BVNULL;
1555
1556                         c->c_needs_tls_accept = 0;
1557
1558                         /* we need to let SASL know */
1559                         ssl = ldap_pvt_tls_sb_ctx( c->c_sb );
1560
1561                         c->c_tls_ssf = (slap_ssf_t) ldap_pvt_tls_get_strength( ssl );
1562                         if( c->c_tls_ssf > c->c_ssf ) {
1563                                 c->c_ssf = c->c_tls_ssf;
1564                         }
1565
1566                         rc = dnX509peerNormalize( ssl, &authid );
1567                         if ( rc != LDAP_SUCCESS ) {
1568                                 Debug( LDAP_DEBUG_TRACE, "connection_read(%d): "
1569                                         "unable to get TLS client DN, error=%d id=%lu\n",
1570                                         s, rc, c->c_connid );
1571                         }
1572                         Statslog( LDAP_DEBUG_STATS,
1573                                 "conn=%lu fd=%d TLS established tls_ssf=%u ssf=%u\n",
1574                             c->c_connid, (int) s, c->c_tls_ssf, c->c_ssf, 0 );
1575                         slap_sasl_external( c, c->c_tls_ssf, &authid );
1576                         if ( authid.bv_val ) free( authid.bv_val );
1577                 }
1578
1579                 /* if success and data is ready, fall thru to data input loop */
1580                 if( rc != 0 ||
1581                         !ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_DATA_READY, NULL ) )
1582                 {
1583 #ifdef SLAP_LIGHTWEIGHT_DISPATCHER
1584                         slapd_set_read( s, 1 );
1585 #endif
1586
1587                         connection_return( c );
1588                         ldap_pvt_thread_mutex_unlock( MCA_GET_CONN_MUTEX(s) );
1589                         return 0;
1590                 }
1591         }
1592 #endif
1593
1594 #ifdef HAVE_CYRUS_SASL
1595         if ( c->c_sasl_layers ) {
1596                 /* If previous layer is not removed yet, give up for now */
1597                 if ( !c->c_sasl_sockctx ) {
1598 #ifdef SLAP_LIGHTWEIGHT_DISPATCHER
1599                         slapd_set_read( s, 1 );
1600 #endif
1601
1602                         connection_return( c );
1603                         ldap_pvt_thread_mutex_unlock( MCA_GET_CONN_MUTEX(s) );
1604                         return 0;
1605                 }
1606
1607                 c->c_sasl_layers = 0;
1608
1609                 rc = ldap_pvt_sasl_install( c->c_sb, c->c_sasl_sockctx );
1610                 if( rc != LDAP_SUCCESS ) {
1611                         Debug( LDAP_DEBUG_TRACE,
1612                                 "connection_read(%d): SASL install error "
1613                                 "error=%d id=%lu, closing\n",
1614                                 s, rc, c->c_connid );
1615
1616                         /* connections_mutex and c_mutex are locked */
1617                         connection_closing( c, "SASL layer install failure" );
1618                         connection_close( c );
1619                         connection_return( c );
1620                         ldap_pvt_thread_mutex_unlock( MCA_GET_CONN_MUTEX(s) );
1621                         return 0;
1622                 }
1623         }
1624 #endif
1625
1626 #define CONNECTION_INPUT_LOOP 1
1627 /* #define      DATA_READY_LOOP 1 */
1628
1629         do {
1630                 /* How do we do this without getting into a busy loop ? */
1631 #ifdef SLAP_LIGHTWEIGHT_DISPATCHER
1632                 rc = connection_input( c, op );
1633 #else
1634                 rc = connection_input( c );
1635 #endif
1636         }
1637 #ifdef DATA_READY_LOOP
1638         while( !rc && ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_DATA_READY, NULL ));
1639 #elif CONNECTION_INPUT_LOOP
1640         while(!rc);
1641 #else
1642         while(0);
1643 #endif
1644
1645         if( rc < 0 ) {
1646                 Debug( LDAP_DEBUG_TRACE,
1647                         "connection_read(%d): input error=%d id=%lu, closing.\n",
1648                         s, rc, c->c_connid );
1649
1650                 /* connections_mutex and c_mutex are locked */
1651                 connection_closing( c, conn_lost_str );
1652                 connection_close( c );
1653                 connection_return( c );
1654                 ldap_pvt_thread_mutex_unlock( MCA_GET_CONN_MUTEX(s) );
1655                 return 0;
1656         }
1657
1658 #ifdef SLAP_LIGHTWEIGHT_DISPATCHER
1659         if ( ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_NEEDS_WRITE, NULL ) ) {
1660                 slapd_set_write( s, 0 );
1661         }
1662
1663         slapd_set_read( s, 1 );
1664 #else
1665         if ( ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_NEEDS_READ, NULL ) ) {
1666                 slapd_set_read( s, 1 );
1667         }
1668
1669         if ( ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_NEEDS_WRITE, NULL ) ) {
1670                 slapd_set_write( s, 1 );
1671         }
1672 #endif
1673
1674         connection_return( c );
1675         ldap_pvt_thread_mutex_unlock( MCA_GET_CONN_MUTEX(s) );
1676
1677         return 0;
1678 }
1679
1680 static int
1681 #ifdef SLAP_LIGHTWEIGHT_DISPATCHER
1682 connection_input( Connection *conn , Operation** c_op )
1683 #else
1684 connection_input( Connection *conn )
1685 #endif
1686 {
1687         Operation *op;
1688         ber_tag_t       tag;
1689         ber_len_t       len;
1690         ber_int_t       msgid;
1691         BerElement      *ber;
1692         int             rc;
1693 #ifdef LDAP_CONNECTIONLESS
1694         Sockaddr        peeraddr;
1695         char            *cdn = NULL;
1696 #endif
1697         char *defer = NULL;
1698
1699         if ( conn->c_currentber == NULL &&
1700                 ( conn->c_currentber = ber_alloc()) == NULL )
1701         {
1702                 Debug( LDAP_DEBUG_ANY, "ber_alloc failed\n", 0, 0, 0 );
1703                 return -1;
1704         }
1705
1706         errno = 0;
1707
1708 #ifdef LDAP_CONNECTIONLESS
1709         if ( conn->c_is_udp ) {
1710                 char peername[sizeof("IP=255.255.255.255:65336")];
1711
1712                 len = ber_int_sb_read(conn->c_sb, &peeraddr, sizeof(struct sockaddr));
1713                 if (len != sizeof(struct sockaddr)) return 1;
1714
1715                 sprintf( peername, "IP=%s:%d",
1716                         inet_ntoa( peeraddr.sa_in_addr.sin_addr ),
1717                         (unsigned) ntohs( peeraddr.sa_in_addr.sin_port ) );
1718                 Statslog( LDAP_DEBUG_STATS,
1719                         "conn=%lu UDP request from %s (%s) accepted.\n",
1720                         conn->c_connid, peername, conn->c_sock_name.bv_val, 0, 0 );
1721         }
1722 #endif
1723
1724         tag = ber_get_next( conn->c_sb, &len, conn->c_currentber );
1725         if ( tag != LDAP_TAG_MESSAGE ) {
1726                 int err = errno;
1727                 ber_socket_t    sd;
1728
1729                 ber_sockbuf_ctrl( conn->c_sb, LBER_SB_OPT_GET_FD, &sd );
1730
1731                 Debug( LDAP_DEBUG_TRACE,
1732                         "ber_get_next on fd %d failed errno=%d (%s)\n",
1733                         sd, err, sock_errstr(err) );
1734                 if ( err != EWOULDBLOCK && err != EAGAIN ) {
1735                         /* log, close and send error */
1736                         ber_free( conn->c_currentber, 1 );
1737                         conn->c_currentber = NULL;
1738
1739                         return -2;
1740                 }
1741                 return 1;
1742         }
1743
1744         ber = conn->c_currentber;
1745         conn->c_currentber = NULL;
1746
1747         if ( (tag = ber_get_int( ber, &msgid )) != LDAP_TAG_MSGID ) {
1748                 /* log, close and send error */
1749                 Debug( LDAP_DEBUG_ANY, "ber_get_int returns 0x%lx\n", tag, 0, 0 );
1750                 ber_free( ber, 1 );
1751                 return -1;
1752         }
1753
1754         if ( (tag = ber_peek_tag( ber, &len )) == LBER_ERROR ) {
1755                 /* log, close and send error */
1756                 Debug( LDAP_DEBUG_ANY, "ber_peek_tag returns 0x%lx\n", tag, 0, 0 );
1757                 ber_free( ber, 1 );
1758
1759                 return -1;
1760         }
1761
1762 #ifdef LDAP_CONNECTIONLESS
1763         if( conn->c_is_udp ) {
1764                 if( tag == LBER_OCTETSTRING ) {
1765                         ber_get_stringa( ber, &cdn );
1766                         tag = ber_peek_tag(ber, &len);
1767                 }
1768                 if( tag != LDAP_REQ_ABANDON && tag != LDAP_REQ_SEARCH ) {
1769                         Debug( LDAP_DEBUG_ANY, "invalid req for UDP 0x%lx\n", tag, 0, 0 );
1770                         ber_free( ber, 1 );
1771                         return 0;
1772                 }
1773         }
1774 #endif
1775
1776         if(tag == LDAP_REQ_BIND) {
1777                 /* immediately abandon all existing operations upon BIND */
1778                 connection_abandon( conn );
1779         }
1780
1781         op = slap_op_alloc( ber, msgid, tag, conn->c_n_ops_received++ );
1782
1783         op->o_conn = conn;
1784         /* clear state if the connection is being reused from inactive */
1785         if ( conn->c_conn_state == SLAP_C_INACTIVE ) {
1786                 memset( &conn->c_pagedresults_state, 0,
1787                         sizeof( conn->c_pagedresults_state ) );
1788         }
1789
1790         op->o_res_ber = NULL;
1791
1792 #ifdef LDAP_CONNECTIONLESS
1793         if (conn->c_is_udp) {
1794                 if ( cdn ) {
1795                         ber_str2bv( cdn, 0, 1, &op->o_dn );
1796                         op->o_protocol = LDAP_VERSION2;
1797                 }
1798                 op->o_res_ber = ber_alloc_t( LBER_USE_DER );
1799                 if (op->o_res_ber == NULL) return 1;
1800
1801                 rc = ber_write( op->o_res_ber, (char *)&peeraddr,
1802                         sizeof(struct sockaddr), 0 );
1803
1804                 if (rc != sizeof(struct sockaddr)) {
1805                         Debug( LDAP_DEBUG_ANY, "ber_write failed\n", 0, 0, 0 );
1806                         return 1;
1807                 }
1808
1809                 if (op->o_protocol == LDAP_VERSION2) {
1810                         rc = ber_printf(op->o_res_ber, "{is{" /*}}*/, op->o_msgid, "");
1811                         if (rc == -1) {
1812                                 Debug( LDAP_DEBUG_ANY, "ber_write failed\n", 0, 0, 0 );
1813                                 return rc;
1814                         }
1815                 }
1816         }
1817 #endif /* LDAP_CONNECTIONLESS */
1818
1819         rc = 0;
1820
1821         /* Don't process requests when the conn is in the middle of a
1822          * Bind, or if it's closing. Also, don't let any single conn
1823          * use up all the available threads, and don't execute if we're
1824          * currently blocked on output. And don't execute if there are
1825          * already pending ops, let them go first.  Abandon operations
1826          * get exceptions to some, but not all, cases.
1827          */
1828         switch( tag ){
1829         default:
1830                 /* Abandon and Unbind are exempt from these checks */
1831                 if (conn->c_conn_state == SLAP_C_CLOSING) {
1832                         defer = "closing";
1833                         break;
1834                 } else if (conn->c_writewaiter) {
1835                         defer = "awaiting write";
1836                         break;
1837                 } else if (conn->c_n_ops_pending) {
1838                         defer = "pending operations";
1839                         break;
1840                 }
1841                 /* FALLTHRU */
1842         case LDAP_REQ_ABANDON:
1843                 /* Unbind is exempt from these checks */
1844                 if (conn->c_n_ops_executing >= connection_pool_max/2) {
1845                         defer = "too many executing";
1846                         break;
1847                 } else if (conn->c_conn_state == SLAP_C_BINDING) {
1848                         defer = "binding";
1849                         break;
1850                 }
1851                 /* FALLTHRU */
1852         case LDAP_REQ_UNBIND:
1853                 break;
1854         }
1855
1856         if( defer ) {
1857                 int max = conn->c_dn.bv_len
1858                         ? slap_conn_max_pending_auth
1859                         : slap_conn_max_pending;
1860
1861                 Debug( LDAP_DEBUG_ANY,
1862                         "connection_input: conn=%lu deferring operation: %s\n",
1863                         conn->c_connid, defer, 0 );
1864                 conn->c_n_ops_pending++;
1865                 LDAP_STAILQ_INSERT_TAIL( &conn->c_pending_ops, op, o_next );
1866                 rc = ( conn->c_n_ops_pending > max ) ? -1 : 0;
1867
1868         } else {
1869                 conn->c_n_ops_executing++;
1870
1871 #if 0
1872                 /*
1873                  * The first op will be processed in the same thread context,
1874                  * Subsequent ops will be submitted to the pool by
1875                  * calling connection_op_activate()
1876                  */
1877                 if ( *c_op == NULL ) {
1878                         /* the first incoming request */
1879                         connection_op_queue( op );
1880                         *c_op = op;
1881                 } else
1882 #endif
1883                 {
1884                         connection_op_activate( op );
1885                 }
1886         }
1887
1888 #ifdef NO_THREADS
1889         if ( conn->c_struct_state != SLAP_C_USED ) {
1890                 /* connection must have got closed underneath us */
1891                 return 1;
1892         }
1893 #endif
1894
1895         assert( conn->c_struct_state == SLAP_C_USED );
1896         return rc;
1897 }
1898
1899 static int
1900 connection_resched( Connection *conn )
1901 {
1902         Operation *op;
1903
1904         if( conn->c_conn_state == SLAP_C_CLOSING ) {
1905                 int rc;
1906                 ber_socket_t    sd;
1907                 ber_sockbuf_ctrl( conn->c_sb, LBER_SB_OPT_GET_FD, &sd );
1908
1909                 /* use trylock to avoid possible deadlock */
1910                 rc = ldap_pvt_thread_mutex_trylock( MCA_GET_CONN_MUTEX( sd ) );
1911
1912                 if( rc ) {
1913                         Debug( LDAP_DEBUG_TRACE,
1914                                 "connection_resched: reaquiring locks conn=%lu sd=%d\n",
1915                                 conn->c_connid, sd, 0 );
1916                         /*
1917                          * reaquire locks in the right order...
1918                          * this may allow another thread to close this connection,
1919                          * so recheck state below.
1920                          */
1921                         ldap_pvt_thread_mutex_unlock( &conn->c_mutex );
1922                         ldap_pvt_thread_mutex_lock( MCA_GET_CONN_MUTEX ( sd ) );
1923                         ldap_pvt_thread_mutex_lock( &conn->c_mutex );
1924                 }
1925
1926                 if( conn->c_conn_state != SLAP_C_CLOSING ) {
1927                         Debug( LDAP_DEBUG_TRACE, "connection_resched: "
1928                                 "closed by other thread conn=%lu sd=%d\n",
1929                                 conn->c_connid, sd, 0 );
1930                 } else {
1931                         Debug( LDAP_DEBUG_TRACE, "connection_resched: "
1932                                 "attempting closing conn=%lu sd=%d\n",
1933                                 conn->c_connid, sd, 0 );
1934                         connection_close( conn );
1935                 }
1936
1937                 ldap_pvt_thread_mutex_unlock( MCA_GET_CONN_MUTEX( sd ) );
1938                 return 0;
1939         }
1940
1941         if( conn->c_conn_state != SLAP_C_ACTIVE || conn->c_writewaiter ) {
1942                 /* other states need different handling */
1943                 return 0;
1944         }
1945
1946         while ((op = LDAP_STAILQ_FIRST( &conn->c_pending_ops )) != NULL) {
1947                 if ( conn->c_n_ops_executing > connection_pool_max/2 ) break;
1948
1949                 LDAP_STAILQ_REMOVE_HEAD( &conn->c_pending_ops, o_next );
1950                 LDAP_STAILQ_NEXT(op, o_next) = NULL;
1951
1952                 /* pending operations should not be marked for abandonment */
1953                 assert(!op->o_abandon);
1954
1955                 conn->c_n_ops_pending--;
1956                 conn->c_n_ops_executing++;
1957
1958                 connection_op_activate( op );
1959
1960                 if ( conn->c_conn_state == SLAP_C_BINDING ) break;
1961         }
1962         return 0;
1963 }
1964
1965 static void
1966 connection_init_log_prefix( Operation *op )
1967 {
1968         if ( op->o_connid == (unsigned long)(-1) ) {
1969                 snprintf( op->o_log_prefix, sizeof( op->o_log_prefix ),
1970                         "conn=-1 op=%lu", op->o_opid );
1971
1972         } else {
1973                 snprintf( op->o_log_prefix, sizeof( op->o_log_prefix ),
1974                         "conn=%lu op=%lu", op->o_connid, op->o_opid );
1975         }
1976 }
1977
1978 static int connection_bind_cb( Operation *op, SlapReply *rs )
1979 {
1980         slap_callback *cb = op->o_callback;
1981         op->o_callback = cb->sc_next;
1982
1983         ldap_pvt_thread_mutex_lock( &op->o_conn->c_mutex );
1984         op->o_conn->c_conn_state = SLAP_C_ACTIVE;
1985         ldap_pvt_thread_mutex_unlock( &op->o_conn->c_mutex );
1986
1987         ch_free( cb );
1988         return SLAP_CB_CONTINUE;
1989 }
1990
1991 static void connection_op_queue( Operation *op )
1992 {
1993         ber_tag_t tag = op->o_tag;
1994
1995         if (tag == LDAP_REQ_BIND) {
1996                 slap_callback *sc = ch_calloc( 1, sizeof( slap_callback ));
1997                 sc->sc_response = connection_bind_cb;
1998                 sc->sc_next = op->o_callback;
1999                 op->o_callback = sc;
2000                 op->o_conn->c_conn_state = SLAP_C_BINDING;
2001         }
2002
2003         if (!op->o_dn.bv_len) {
2004                 op->o_authz = op->o_conn->c_authz;
2005                 if ( BER_BVISNULL( &op->o_conn->c_sasl_authz_dn )) {
2006                         ber_dupbv( &op->o_dn, &op->o_conn->c_dn );
2007                         ber_dupbv( &op->o_ndn, &op->o_conn->c_ndn );
2008                 } else {
2009                         ber_dupbv( &op->o_dn, &op->o_conn->c_sasl_authz_dn );
2010                         ber_dupbv( &op->o_ndn, &op->o_conn->c_sasl_authz_dn );
2011                 }
2012         }
2013
2014         op->o_authtype = op->o_conn->c_authtype;
2015         ber_dupbv( &op->o_authmech, &op->o_conn->c_authmech );
2016
2017         if (!op->o_protocol) {
2018                 op->o_protocol = op->o_conn->c_protocol
2019                         ? op->o_conn->c_protocol : LDAP_VERSION3;
2020         }
2021
2022         if (op->o_conn->c_conn_state == SLAP_C_INACTIVE &&
2023                 op->o_protocol > LDAP_VERSION2)
2024         {
2025                 op->o_conn->c_conn_state = SLAP_C_ACTIVE;
2026         }
2027
2028         op->o_connid = op->o_conn->c_connid;
2029         connection_init_log_prefix( op );
2030
2031         LDAP_STAILQ_INSERT_TAIL( &op->o_conn->c_ops, op, o_next );
2032 }
2033
2034 static int connection_op_activate( Operation *op )
2035 {
2036         int rc;
2037
2038         connection_op_queue( op );
2039
2040         rc = ldap_pvt_thread_pool_submit( &connection_pool,
2041                 connection_operation, (void *) op );
2042
2043         if ( rc != 0 ) {
2044                 Debug( LDAP_DEBUG_ANY,
2045                         "connection_op_activate: submit failed (%d) for conn=%lu\n",
2046                         rc, op->o_connid, 0 );
2047                 /* should move op to pending list */
2048         }
2049
2050         return rc;
2051 }
2052
2053 #ifdef SLAP_LIGHTWEIGHT_DISPATCHER
2054 static int connection_write( ber_socket_t s );
2055 static void *connection_write_thread( void *ctx, void *arg )
2056 {
2057         return (void *)(long)connection_write((long)arg);
2058 }
2059
2060 int connection_write_activate( ber_socket_t s )
2061 {
2062         int rc;
2063
2064         /*
2065          * suspend reading on this file descriptor until a connection processing
2066          * thread write data on it. Otherwise the listener thread will repeatedly
2067          * submit the same event on it to the pool.
2068          */
2069         slapd_clr_write( s, 0);
2070
2071         rc = ldap_pvt_thread_pool_submit( &connection_pool,
2072                 connection_write_thread, (void *)(long)s );
2073
2074         if( rc != 0 ) {
2075                 Debug( LDAP_DEBUG_ANY,
2076                         "connection_write_activate(%d): submit failed (%d)\n",
2077                         (int) s, rc, 0 );
2078         }
2079         return rc;
2080 }
2081
2082 static
2083 #endif
2084 int connection_write(ber_socket_t s)
2085 {
2086         Connection *c;
2087         Operation *op;
2088
2089         assert( connections != NULL );
2090
2091         ldap_pvt_thread_mutex_lock( MCA_GET_CONN_MUTEX( s ) );
2092
2093         c = connection_get( s );
2094         if( c == NULL ) {
2095                 Debug( LDAP_DEBUG_ANY,
2096                         "connection_write(%ld): no connection!\n",
2097                         (long)s, 0, 0 );
2098                 ldap_pvt_thread_mutex_unlock( MCA_GET_CONN_MUTEX( s ) );
2099                 return -1;
2100         }
2101
2102 #ifndef SLAP_LIGHTWEIGHT_DISPATCHER
2103         slapd_clr_write( s, 0);
2104 #endif
2105         c->c_n_write++;
2106
2107         Debug( LDAP_DEBUG_TRACE,
2108                 "connection_write(%d): waking output for id=%lu\n",
2109                 s, c->c_connid, 0 );
2110         ldap_pvt_thread_cond_signal( &c->c_write_cv );
2111
2112         if ( ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_NEEDS_READ, NULL ) ) {
2113                 slapd_set_read( s, 1 );
2114         }
2115         if ( ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_NEEDS_WRITE, NULL ) ) {
2116                 slapd_set_write( s, 1 );
2117         }
2118
2119         /* If there are ops pending because of a writewaiter,
2120          * start one up.
2121          */
2122         while ((op = LDAP_STAILQ_FIRST( &c->c_pending_ops )) != NULL) {
2123                 if ( !c->c_writewaiter ) break;
2124                 if ( c->c_n_ops_executing > connection_pool_max/2 ) break;
2125
2126                 LDAP_STAILQ_REMOVE_HEAD( &c->c_pending_ops, o_next );
2127                 LDAP_STAILQ_NEXT(op, o_next) = NULL;
2128
2129                 /* pending operations should not be marked for abandonment */
2130                 assert(!op->o_abandon);
2131
2132                 c->c_n_ops_pending--;
2133                 c->c_n_ops_executing++;
2134
2135                 connection_op_activate( op );
2136
2137                 break;
2138         }
2139
2140         connection_return( c );
2141         ldap_pvt_thread_mutex_unlock( MCA_GET_CONN_MUTEX(s) );
2142         return 0;
2143 }
2144
2145 void
2146 connection_fake_init(
2147         Connection *conn,
2148         Operation *op,
2149         void *ctx )
2150 {
2151         conn->c_connid = -1;
2152         conn->c_send_ldap_result = slap_send_ldap_result;
2153         conn->c_send_search_entry = slap_send_search_entry;
2154         conn->c_send_search_reference = slap_send_search_reference;
2155         conn->c_listener = (Listener *)&dummy_list;
2156         conn->c_peer_domain = slap_empty_bv;
2157         conn->c_peer_name = slap_empty_bv;
2158
2159         memset(op, 0, OPERATION_BUFFER_SIZE);
2160         op->o_hdr = (Opheader *)(op+1);
2161         op->o_controls = (void **)(op->o_hdr+1);
2162         /* set memory context */
2163         op->o_tmpmemctx = slap_sl_mem_create(SLAP_SLAB_SIZE, SLAP_SLAB_STACK, ctx);
2164         op->o_tmpmfuncs = &slap_sl_mfuncs;
2165         op->o_threadctx = ctx;
2166
2167         op->o_conn = conn;
2168         op->o_connid = op->o_conn->c_connid;
2169         connection_init_log_prefix( op );
2170
2171         slap_op_time( &op->o_time, &op->o_tincr );
2172 }
2173
2174 void
2175 connection_assign_nextid( Connection *conn )
2176 {
2177         ldap_pvt_thread_mutex_lock( &conn_nextid_mutex );
2178         conn->c_connid = conn_nextid++;
2179         ldap_pvt_thread_mutex_unlock( &conn_nextid_mutex );
2180 }