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 #include <limits.h>
  30
  31 #include <ac/socket.h>
  32 #include <ac/errno.h>
  33 #include <ac/string.h>
  34 #include <ac/time.h>
  35 #include <ac/unistd.h>
  36
  37 #include "lutil.h"
  38 #include "slap.h"
  39
  40 #ifdef LDAP_SLAPI
  41 #include "slapi/slapi.h"
  42 #endif
  43
  44 /* protected by connections_mutex */
  45 static ldap_pvt_thread_mutex_t connections_mutex;
  46 static Connection *connections = NULL;
  47
  48 static ldap_pvt_thread_mutex_t conn_nextid_mutex;
  49 static unsigned long conn_nextid = 0;
  50
  51 /* structure state (protected by connections_mutex) */
  52 #define SLAP_C_UNINITIALIZED    0x00    /* MUST BE ZERO (0) */
  53 #define SLAP_C_UNUSED                   0x01
  54 #define SLAP_C_USED                             0x02
  55
  56 /* connection state (protected by c_mutex ) */
  57 #define SLAP_C_INVALID                  0x00    /* MUST BE ZERO (0) */
  58 #define SLAP_C_INACTIVE                 0x01    /* zero threads */
  59 #define SLAP_C_ACTIVE                   0x02    /* one or more threads */
  60 #define SLAP_C_BINDING                  0x03    /* binding */
  61 #define SLAP_C_CLOSING                  0x04    /* closing */
  62 #define SLAP_C_CLIENT                   0x05    /* outbound client conn */
  63
  64 const char *
  65 connection_state2str( int state )
  66 {
  67         switch( state ) {
  68         case SLAP_C_INVALID:    return "!";
  69         case SLAP_C_INACTIVE:   return "|";
  70         case SLAP_C_ACTIVE:             return "";
  71         case SLAP_C_BINDING:    return "B";
  72         case SLAP_C_CLOSING:    return "C";
  73         case SLAP_C_CLIENT:             return "L";
  74         }
  75
  76         return "?";
  77 }
  78
  79 static Connection* connection_get( ber_socket_t s );
  80
  81 static int connection_input( Connection *c );
  82 static void connection_close( Connection *c );
  83
  84 static int connection_op_activate( Operation *op );
  85 static int connection_resched( Connection *conn );
  86 static void connection_abandon( Connection *conn );
  87 static void connection_destroy( Connection *c );
  88
  89 static ldap_pvt_thread_start_t connection_operation;
  90
  91 /*
  92  * Initialize connection management infrastructure.
  93  */
  94 int connections_init(void)
  95 {
  96         int i;
  97
  98         assert( connections == NULL );
  99
 100         if( connections != NULL) {
 101                 Debug( LDAP_DEBUG_ANY, "connections_init: already initialized.\n",
 102                         0, 0, 0 );
 103                 return -1;
 104         }
 105
 106         /* should check return of every call */
 107         ldap_pvt_thread_mutex_init( &connections_mutex );
 108         ldap_pvt_thread_mutex_init( &conn_nextid_mutex );
 109
 110         connections = (Connection *) ch_calloc( dtblsize, sizeof(Connection) );
 111
 112         if( connections == NULL ) {
 113                 Debug( LDAP_DEBUG_ANY,
 114                         "connections_init: allocation (%d*%ld) of connection array failed\n",
 115                         dtblsize, (long) sizeof(Connection), 0 );
 116                 return -1;
 117         }
 118
 119         assert( connections[0].c_struct_state == SLAP_C_UNINITIALIZED );
 120         assert( connections[dtblsize-1].c_struct_state == SLAP_C_UNINITIALIZED );
 121
 122         for (i=0; i<dtblsize; i++) connections[i].c_conn_idx = i;
 123
 124         /*
 125          * per entry initialization of the Connection array initialization
 126          * will be done by connection_init()
 127          */
 128
 129         return 0;
 130 }
 131
 132 /*
 133  * Destroy connection management infrastructure.
 134  */
 135 int connections_destroy(void)
 136 {
 137         ber_socket_t i;
 138
 139         /* should check return of every call */
 140
 141         if( connections == NULL) {
 142                 Debug( LDAP_DEBUG_ANY, "connections_destroy: nothing to destroy.\n",
 143                         0, 0, 0 );
 144                 return -1;
 145         }
 146
 147         for ( i = 0; i < dtblsize; i++ ) {
 148                 if( connections[i].c_struct_state != SLAP_C_UNINITIALIZED ) {
 149                         ber_sockbuf_free( connections[i].c_sb );
 150                         ldap_pvt_thread_mutex_destroy( &connections[i].c_mutex );
 151                         ldap_pvt_thread_mutex_destroy( &connections[i].c_write_mutex );
 152                         ldap_pvt_thread_cond_destroy( &connections[i].c_write_cv );
 153 #ifdef LDAP_SLAPI
 154                         if ( slapi_plugins_used ) {
 155                                 slapi_int_free_object_extensions( SLAPI_X_EXT_CONNECTION, &connections[i] );
 156                         }
 157 #endif
 158                 }
 159         }
 160
 161         free( connections );
 162         connections = NULL;
 163
 164         ldap_pvt_thread_mutex_destroy( &connections_mutex );
 165         ldap_pvt_thread_mutex_destroy( &conn_nextid_mutex );
 166         return 0;
 167 }
 168
 169 /*
 170  * shutdown all connections
 171  */
 172 int connections_shutdown(void)
 173 {
 174         ber_socket_t i;
 175
 176         ldap_pvt_thread_mutex_lock( &connections_mutex );
 177
 178         for ( i = 0; i < dtblsize; i++ ) {
 179                 if( connections[i].c_struct_state != SLAP_C_USED ) {
 180                         continue;
 181                 }
 182                 /* give persistent clients a chance to cleanup */
 183                 if( connections[i].c_conn_state == SLAP_C_CLIENT ) {
 184                         ldap_pvt_thread_pool_submit( &connection_pool,
 185                         connections[i].c_clientfunc, connections[i].c_clientarg );
 186                         continue;
 187                 }
 188
 189                 ldap_pvt_thread_mutex_lock( &connections[i].c_mutex );
 190
 191                 /* connections_mutex and c_mutex are locked */
 192                 connection_closing( &connections[i] );
 193                 connection_close( &connections[i] );
 194
 195                 ldap_pvt_thread_mutex_unlock( &connections[i].c_mutex );
 196         }
 197
 198         ldap_pvt_thread_mutex_unlock( &connections_mutex );
 199
 200         return 0;
 201 }
 202
 203 /*
 204  * Timeout idle connections.
 205  */
 206 int connections_timeout_idle(time_t now)
 207 {
 208         int i = 0;
 209         int connindex;
 210         Connection* c;
 211
 212         for( c = connection_first( &connindex );
 213                 c != NULL;
 214                 c = connection_next( c, &connindex ) )
 215         {
 216                 /* Don't timeout a slow-running request or a persistent
 217                  * outbound connection */
 218                 if( c->c_n_ops_executing ||
 219                         c->c_conn_state == SLAP_C_CLIENT ) continue;
 220
 221                 if( difftime( c->c_activitytime+global_idletimeout, now) < 0 ) {
 222                         /* close it */
 223                         connection_closing( c );
 224                         connection_close( c );
 225                         i++;
 226                 }
 227         }
 228         connection_done( c );
 229
 230         return i;
 231 }
 232
 233 static Connection* connection_get( ber_socket_t s )
 234 {
 235         /* connections_mutex should be locked by caller */
 236
 237         Connection *c;
 238
 239         Debug( LDAP_DEBUG_ARGS,
 240                 "connection_get(%ld)\n",
 241                 (long) s, 0, 0 );
 242
 243         assert( connections != NULL );
 244
 245         if(s == AC_SOCKET_INVALID) {
 246                 return NULL;
 247         }
 248
 249 #ifndef HAVE_WINSOCK
 250         c = &connections[s];
 251
 252         assert( c->c_struct_state != SLAP_C_UNINITIALIZED );
 253
 254 #else
 255         c = NULL;
 256         {
 257                 ber_socket_t i, sd;
 258
 259                 for(i=0; i<dtblsize; i++) {
 260                         if( connections[i].c_struct_state == SLAP_C_UNINITIALIZED ) {
 261                                 assert( connections[i].c_conn_state == SLAP_C_INVALID );
 262                                 assert( connections[i].c_sb == 0 );
 263                                 break;
 264                         }
 265
 266                         ber_sockbuf_ctrl( connections[i].c_sb,
 267                                 LBER_SB_OPT_GET_FD, &sd );
 268
 269                         if( connections[i].c_struct_state == SLAP_C_UNUSED ) {
 270                                 assert( connections[i].c_conn_state == SLAP_C_INVALID );
 271                                 assert( sd == AC_SOCKET_INVALID );
 272                                 continue;
 273                         }
 274
 275                         /* state can actually change from used -> unused by resched,
 276                          * so don't assert details here.
 277                          */
 278
 279                         if( sd == s ) {
 280                                 c = &connections[i];
 281                                 break;
 282                         }
 283                 }
 284         }
 285 #endif
 286
 287         if( c != NULL ) {
 288                 ber_socket_t    sd;
 289
 290                 ldap_pvt_thread_mutex_lock( &c->c_mutex );
 291
 292                 ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_GET_FD, &sd );
 293                 if( c->c_struct_state != SLAP_C_USED ) {
 294                         /* connection must have been closed due to resched */
 295
 296                         assert( c->c_conn_state == SLAP_C_INVALID );
 297                         assert( sd == AC_SOCKET_INVALID );
 298
 299                         Debug( LDAP_DEBUG_TRACE,
 300                                 "connection_get(%d): connection not used\n",
 301                                 s, 0, 0 );
 302
 303                         ldap_pvt_thread_mutex_unlock( &c->c_mutex );
 304                         return NULL;
 305                 }
 306
 307                 Debug( LDAP_DEBUG_TRACE,
 308                         "connection_get(%d): got connid=%lu\n",
 309                         s, c->c_connid, 0 );
 310
 311                 c->c_n_get++;
 312
 313                 assert( c->c_struct_state == SLAP_C_USED );
 314                 assert( c->c_conn_state != SLAP_C_INVALID );
 315                 assert( sd != AC_SOCKET_INVALID );
 316
 317 #ifndef SLAPD_MONITOR
 318                 if ( global_idletimeout > 0 )
 319 #endif /* ! SLAPD_MONITOR */
 320                 {
 321                         c->c_activitytime = slap_get_time();
 322                 }
 323         }
 324
 325         return c;
 326 }
 327
 328 static void connection_return( Connection *c )
 329 {
 330         ldap_pvt_thread_mutex_unlock( &c->c_mutex );
 331 }
 332
 333 long connection_init(
 334         ber_socket_t s,
 335         Listener *listener,
 336         const char* dnsname,
 337         const char* peername,
 338         int flags,
 339         slap_ssf_t ssf,
 340         struct berval *authid )
 341 {
 342         unsigned long id;
 343         Connection *c;
 344
 345         assert( connections != NULL );
 346
 347         assert( listener != NULL );
 348         assert( dnsname != NULL );
 349         assert( peername != NULL );
 350
 351 #ifndef HAVE_TLS
 352         assert( flags != CONN_IS_TLS );
 353 #endif
 354
 355         if( s == AC_SOCKET_INVALID ) {
 356                 Debug( LDAP_DEBUG_ANY,
 357                         "connection_init: init of socket %ld invalid.\n", (long)s, 0, 0 );
 358                 return -1;
 359         }
 360
 361         assert( s >= 0 );
 362 #ifndef HAVE_WINSOCK
 363         assert( s < dtblsize );
 364 #endif
 365
 366         ldap_pvt_thread_mutex_lock( &connections_mutex );
 367
 368 #ifndef HAVE_WINSOCK
 369         c = &connections[s];
 370
 371 #else
 372         {
 373                 ber_socket_t i;
 374                 c = NULL;
 375
 376                 for( i=0; i < dtblsize; i++) {
 377                         ber_socket_t    sd;
 378
 379                         if( connections[i].c_struct_state == SLAP_C_UNINITIALIZED ) {
 380                                 assert( connections[i].c_sb == 0 );
 381                                 c = &connections[i];
 382                                 break;
 383                         }
 384
 385                         sd = AC_SOCKET_INVALID;
 386                         if (connections[i].c_sb != NULL) {
 387                                 ber_sockbuf_ctrl( connections[i].c_sb,
 388                                         LBER_SB_OPT_GET_FD, &sd );
 389                         }
 390
 391                         if( connections[i].c_struct_state == SLAP_C_UNUSED ) {
 392                                 assert( sd == AC_SOCKET_INVALID );
 393                                 c = &connections[i];
 394                                 break;
 395                         }
 396
 397                         if( connections[i].c_conn_state == SLAP_C_CLIENT ) {
 398                                 continue;
 399                         }
 400
 401                         assert( connections[i].c_struct_state == SLAP_C_USED );
 402                         assert( connections[i].c_conn_state != SLAP_C_INVALID );
 403                         assert( sd != AC_SOCKET_INVALID );
 404                 }
 405
 406                 if( c == NULL ) {
 407                         Debug( LDAP_DEBUG_ANY,
 408                                 "connection_init(%d): connection table full "
 409                                 "(%d/%d)\n", s, i, dtblsize);
 410                         ldap_pvt_thread_mutex_unlock( &connections_mutex );
 411                         return -1;
 412                 }
 413         }
 414 #endif
 415
 416         assert( c != NULL );
 417
 418         if( c->c_struct_state == SLAP_C_UNINITIALIZED ) {
 419                 c->c_send_ldap_result = slap_send_ldap_result;
 420                 c->c_send_search_entry = slap_send_search_entry;
 421                 c->c_send_search_reference = slap_send_search_reference;
 422                 c->c_send_ldap_extended = slap_send_ldap_extended;
 423 #ifdef LDAP_RES_INTERMEDIATE
 424                 c->c_send_ldap_intermediate = slap_send_ldap_intermediate;
 425 #endif
 426
 427                 BER_BVZERO( &c->c_authmech );
 428                 BER_BVZERO( &c->c_dn );
 429                 BER_BVZERO( &c->c_ndn );
 430
 431                 c->c_listener = NULL;
 432                 BER_BVZERO( &c->c_peer_domain );
 433                 BER_BVZERO( &c->c_peer_name );
 434
 435                 LDAP_STAILQ_INIT(&c->c_ops);
 436                 LDAP_STAILQ_INIT(&c->c_pending_ops);
 437
 438                 BER_BVZERO( &c->c_sasl_bind_mech );
 439                 c->c_sasl_done = 0;
 440                 c->c_sasl_authctx = NULL;
 441                 c->c_sasl_sockctx = NULL;
 442                 c->c_sasl_extra = NULL;
 443                 c->c_sasl_bindop = NULL;
 444
 445                 c->c_sb = ber_sockbuf_alloc( );
 446
 447                 {
 448                         ber_len_t max = sockbuf_max_incoming;
 449                         ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_SET_MAX_INCOMING, &max );
 450                 }
 451
 452                 c->c_currentber = NULL;
 453
 454                 /* should check status of thread calls */
 455                 ldap_pvt_thread_mutex_init( &c->c_mutex );
 456                 ldap_pvt_thread_mutex_init( &c->c_write_mutex );
 457                 ldap_pvt_thread_cond_init( &c->c_write_cv );
 458
 459 #ifdef LDAP_SLAPI
 460                 if ( slapi_plugins_used ) {
 461                         slapi_int_create_object_extensions( SLAPI_X_EXT_CONNECTION, c );
 462                 }
 463 #endif
 464
 465                 c->c_struct_state = SLAP_C_UNUSED;
 466         }
 467
 468         ldap_pvt_thread_mutex_lock( &c->c_mutex );
 469
 470         assert( c->c_struct_state == SLAP_C_UNUSED );
 471         assert( BER_BVISNULL( &c->c_authmech ) );
 472         assert( BER_BVISNULL( &c->c_dn ) );
 473         assert( BER_BVISNULL( &c->c_ndn ) );
 474         assert( c->c_listener == NULL );
 475         assert( BER_BVISNULL( &c->c_peer_domain ) );
 476         assert( BER_BVISNULL( &c->c_peer_name ) );
 477         assert( LDAP_STAILQ_EMPTY(&c->c_ops) );
 478         assert( LDAP_STAILQ_EMPTY(&c->c_pending_ops) );
 479         assert( BER_BVISNULL( &c->c_sasl_bind_mech ) );
 480         assert( c->c_sasl_done == 0 );
 481         assert( c->c_sasl_authctx == NULL );
 482         assert( c->c_sasl_sockctx == NULL );
 483         assert( c->c_sasl_extra == NULL );
 484         assert( c->c_sasl_bindop == NULL );
 485         assert( c->c_currentber == NULL );
 486         assert( c->c_writewaiter == 0);
 487
 488         c->c_listener = listener;
 489
 490         if ( flags == CONN_IS_CLIENT ) {
 491                 c->c_conn_state = SLAP_C_CLIENT;
 492                 c->c_struct_state = SLAP_C_USED;
 493                 ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_SET_FD, &s );
 494                 ldap_pvt_thread_mutex_unlock( &c->c_mutex );
 495                 ldap_pvt_thread_mutex_unlock( &connections_mutex );
 496
 497                 return 0;
 498         }
 499
 500         ber_str2bv( dnsname, 0, 1, &c->c_peer_domain );
 501         ber_str2bv( peername, 0, 1, &c->c_peer_name );
 502
 503         c->c_n_ops_received = 0;
 504         c->c_n_ops_executing = 0;
 505         c->c_n_ops_pending = 0;
 506         c->c_n_ops_completed = 0;
 507
 508         c->c_n_get = 0;
 509         c->c_n_read = 0;
 510         c->c_n_write = 0;
 511
 512         /* set to zero until bind, implies LDAP_VERSION3 */
 513         c->c_protocol = 0;
 514
 515 #ifndef SLAPD_MONITOR
 516         if ( global_idletimeout > 0 )
 517 #endif /* ! SLAPD_MONITOR */
 518         {
 519                 c->c_activitytime = c->c_starttime = slap_get_time();
 520         }
 521
 522 #ifdef LDAP_CONNECTIONLESS
 523         c->c_is_udp = 0;
 524         if( flags == CONN_IS_UDP ) {
 525                 c->c_is_udp = 1;
 526 #ifdef LDAP_DEBUG
 527                 ber_sockbuf_add_io( c->c_sb, &ber_sockbuf_io_debug,
 528                         LBER_SBIOD_LEVEL_PROVIDER, (void*)"udp_" );
 529 #endif
 530                 ber_sockbuf_add_io( c->c_sb, &ber_sockbuf_io_udp,
 531                         LBER_SBIOD_LEVEL_PROVIDER, (void *)&s );
 532                 ber_sockbuf_add_io( c->c_sb, &ber_sockbuf_io_readahead,
 533                         LBER_SBIOD_LEVEL_PROVIDER, NULL );
 534         } else
 535 #endif
 536         {
 537 #ifdef LDAP_DEBUG
 538                 ber_sockbuf_add_io( c->c_sb, &ber_sockbuf_io_debug,
 539                         LBER_SBIOD_LEVEL_PROVIDER, (void*)"tcp_" );
 540 #endif
 541                 ber_sockbuf_add_io( c->c_sb, &ber_sockbuf_io_tcp,
 542                         LBER_SBIOD_LEVEL_PROVIDER, (void *)&s );
 543         }
 544
 545 #ifdef LDAP_DEBUG
 546         ber_sockbuf_add_io( c->c_sb, &ber_sockbuf_io_debug,
 547                 INT_MAX, (void*)"ldap_" );
 548 #endif
 549
 550         if( ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_SET_NONBLOCK,
 551                 c /* non-NULL */ ) < 0 )
 552         {
 553                 Debug( LDAP_DEBUG_ANY,
 554                         "connection_init(%d, %s): set nonblocking failed\n",
 555                         s, c->c_peer_name.bv_val, 0 );
 556         }
 557
 558         ldap_pvt_thread_mutex_lock( &conn_nextid_mutex );
 559         id = c->c_connid = conn_nextid++;
 560         ldap_pvt_thread_mutex_unlock( &conn_nextid_mutex );
 561
 562         c->c_conn_state = SLAP_C_INACTIVE;
 563         c->c_struct_state = SLAP_C_USED;
 564
 565         c->c_ssf = c->c_transport_ssf = ssf;
 566         c->c_tls_ssf = 0;
 567
 568 #ifdef HAVE_TLS
 569         if ( flags == CONN_IS_TLS ) {
 570                 c->c_is_tls = 1;
 571                 c->c_needs_tls_accept = 1;
 572         } else {
 573                 c->c_is_tls = 0;
 574                 c->c_needs_tls_accept = 0;
 575         }
 576 #endif
 577
 578         slap_sasl_open( c, 0 );
 579         slap_sasl_external( c, ssf, authid );
 580
 581         ldap_pvt_thread_mutex_unlock( &c->c_mutex );
 582         ldap_pvt_thread_mutex_unlock( &connections_mutex );
 583
 584         backend_connection_init(c);
 585
 586         return id;
 587 }
 588
 589 void connection2anonymous( Connection *c )
 590 {
 591         assert( connections != NULL );
 592         assert( c != NULL );
 593
 594         {
 595                 ber_len_t max = sockbuf_max_incoming;
 596                 ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_SET_MAX_INCOMING, &max );
 597         }
 598
 599         if(c->c_authmech.bv_val != NULL ) {
 600                 free(c->c_authmech.bv_val);
 601         }
 602         BER_BVZERO( &c->c_authmech );
 603
 604         if(c->c_dn.bv_val != NULL) {
 605                 free(c->c_dn.bv_val);
 606         }
 607         BER_BVZERO( &c->c_dn );
 608         if(c->c_ndn.bv_val != NULL) {
 609                 free(c->c_ndn.bv_val);
 610         }
 611         BER_BVZERO( &c->c_ndn );
 612
 613         c->c_authz_backend = NULL;
 614 }
 615
 616 static void
 617 connection_destroy( Connection *c )
 618 {
 619         /* note: connections_mutex should be locked by caller */
 620         ber_socket_t    sd;
 621         unsigned long   connid;
 622
 623         assert( connections != NULL );
 624         assert( c != NULL );
 625         assert( c->c_struct_state != SLAP_C_UNUSED );
 626         assert( c->c_conn_state != SLAP_C_INVALID );
 627         assert( LDAP_STAILQ_EMPTY(&c->c_ops) );
 628         assert( c->c_writewaiter == 0);
 629
 630         /* only for stats (print -1 as "%lu" may give unexpected results ;) */
 631         connid = c->c_connid;
 632
 633         backend_connection_destroy(c);
 634
 635         c->c_protocol = 0;
 636         c->c_connid = -1;
 637
 638         c->c_activitytime = c->c_starttime = 0;
 639
 640         connection2anonymous( c );
 641         c->c_listener = NULL;
 642
 643         if(c->c_peer_domain.bv_val != NULL) {
 644                 free(c->c_peer_domain.bv_val);
 645         }
 646         BER_BVZERO( &c->c_peer_domain );
 647         if(c->c_peer_name.bv_val != NULL) {
 648                 free(c->c_peer_name.bv_val);
 649         }
 650         BER_BVZERO( &c->c_peer_name );
 651
 652         c->c_sasl_bind_in_progress = 0;
 653         if(c->c_sasl_bind_mech.bv_val != NULL) {
 654                 free(c->c_sasl_bind_mech.bv_val);
 655         }
 656         BER_BVZERO( &c->c_sasl_bind_mech );
 657
 658         slap_sasl_close( c );
 659
 660         if ( c->c_currentber != NULL ) {
 661                 ber_free( c->c_currentber, 1 );
 662                 c->c_currentber = NULL;
 663         }
 664
 665         ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_GET_FD, &sd );
 666         if ( sd != AC_SOCKET_INVALID ) {
 667                 slapd_remove( sd, 1, 0 );
 668
 669                 Statslog( LDAP_DEBUG_STATS,
 670                         "conn=%lu fd=%ld closed\n",
 671                         connid, (long) sd, 0, 0, 0 );
 672         }
 673
 674         ber_sockbuf_free( c->c_sb );
 675
 676         c->c_sb = ber_sockbuf_alloc( );
 677
 678         {
 679                 ber_len_t max = sockbuf_max_incoming;
 680                 ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_SET_MAX_INCOMING, &max );
 681         }
 682
 683         c->c_conn_state = SLAP_C_INVALID;
 684         c->c_struct_state = SLAP_C_UNUSED;
 685
 686 #ifdef LDAP_SLAPI
 687         /* call destructors, then constructors; avoids unnecessary allocation */
 688         if ( slapi_plugins_used ) {
 689                 slapi_int_clear_object_extensions( SLAPI_X_EXT_CONNECTION, c );
 690         }
 691 #endif
 692 }
 693
 694 int connection_state_closing( Connection *c )
 695 {
 696         /* c_mutex must be locked by caller */
 697
 698         int state;
 699         assert( c != NULL );
 700         assert( c->c_struct_state == SLAP_C_USED );
 701
 702         state = c->c_conn_state;
 703
 704         assert( state != SLAP_C_INVALID );
 705
 706         return state == SLAP_C_CLOSING;
 707 }
 708
 709 static void connection_abandon( Connection *c )
 710 {
 711         /* c_mutex must be locked by caller */
 712
 713         Operation *o, *next, op = {0};
 714         Opheader ohdr = {0};
 715         SlapReply rs = {0};
 716
 717         op.o_hdr = &ohdr;
 718         op.o_conn = c;
 719         op.o_connid = c->c_connid;
 720         op.o_tag = LDAP_REQ_ABANDON;
 721         for ( o = LDAP_STAILQ_FIRST( &c->c_ops ); o; o=next ) {
 722                 next = LDAP_STAILQ_NEXT( o, o_next );
 723                 op.orn_msgid = o->o_msgid;
 724                 o->o_abandon = 1;
 725                 op.o_bd = frontendDB;
 726                 frontendDB->be_abandon( &op, &rs );
 727         }
 728
 729         /* remove pending operations */
 730         while ( (o = LDAP_STAILQ_FIRST( &c->c_pending_ops )) != NULL) {
 731                 LDAP_STAILQ_REMOVE_HEAD( &c->c_pending_ops, o_next );
 732                 LDAP_STAILQ_NEXT(o, o_next) = NULL;
 733                 slap_op_free( o );
 734         }
 735 }
 736
 737 void connection_closing( Connection *c )
 738 {
 739         assert( connections != NULL );
 740         assert( c != NULL );
 741         assert( c->c_struct_state == SLAP_C_USED );
 742         assert( c->c_conn_state != SLAP_C_INVALID );
 743
 744         /* c_mutex must be locked by caller */
 745
 746         if( c->c_conn_state != SLAP_C_CLOSING ) {
 747                 ber_socket_t    sd;
 748
 749                 ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_GET_FD, &sd );
 750                 Debug( LDAP_DEBUG_TRACE,
 751                         "connection_closing: readying conn=%lu sd=%d for close\n",
 752                         c->c_connid, sd, 0 );
 753                 /* update state to closing */
 754                 c->c_conn_state = SLAP_C_CLOSING;
 755
 756                 /* don't listen on this port anymore */
 757                 slapd_clr_read( sd, 1 );
 758
 759                 /* abandon active operations */
 760                 connection_abandon( c );
 761
 762                 /* wake write blocked operations */
 763                 slapd_clr_write( sd, 1 );
 764                 ldap_pvt_thread_cond_signal( &c->c_write_cv );
 765         }
 766 }
 767
 768 static void connection_close( Connection *c )
 769 {
 770         ber_socket_t    sd;
 771
 772         assert( connections != NULL );
 773         assert( c != NULL );
 774         assert( c->c_struct_state == SLAP_C_USED );
 775         assert( c->c_conn_state == SLAP_C_CLOSING );
 776
 777         /* note: connections_mutex and c_mutex should be locked by caller */
 778
 779         ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_GET_FD, &sd );
 780         if( !LDAP_STAILQ_EMPTY(&c->c_ops) ) {
 781                 Debug( LDAP_DEBUG_TRACE,
 782                         "connection_close: deferring conn=%lu sd=%d\n",
 783                         c->c_connid, sd, 0 );
 784                 return;
 785         }
 786
 787         Debug( LDAP_DEBUG_TRACE, "connection_close: conn=%lu sd=%d\n",
 788                 c->c_connid, sd, 0 );
 789         connection_destroy( c );
 790 }
 791
 792 unsigned long connections_nextid(void)
 793 {
 794         unsigned long id;
 795         assert( connections != NULL );
 796
 797         ldap_pvt_thread_mutex_lock( &connections_mutex );
 798
 799         id = conn_nextid;
 800
 801         ldap_pvt_thread_mutex_unlock( &connections_mutex );
 802
 803         return id;
 804 }
 805
 806 Connection* connection_first( ber_socket_t *index )
 807 {
 808         assert( connections != NULL );
 809         assert( index != NULL );
 810
 811         ldap_pvt_thread_mutex_lock( &connections_mutex );
 812
 813         *index = 0;
 814
 815         return connection_next(NULL, index);
 816 }
 817
 818 Connection* connection_next( Connection *c, ber_socket_t *index )
 819 {
 820         assert( connections != NULL );
 821         assert( index != NULL );
 822         assert( *index <= dtblsize );
 823
 824         if( c != NULL ) {
 825                 ldap_pvt_thread_mutex_unlock( &c->c_mutex );
 826         }
 827
 828         c = NULL;
 829
 830         for(; *index < dtblsize; (*index)++) {
 831                 if( connections[*index].c_struct_state == SLAP_C_UNINITIALIZED ) {
 832                         assert( connections[*index].c_conn_state == SLAP_C_INVALID );
 833 #ifndef HAVE_WINSOCK
 834                         continue;
 835 #else
 836                         break;
 837 #endif
 838                 }
 839
 840                 if( connections[*index].c_struct_state == SLAP_C_USED ) {
 841                         assert( connections[*index].c_conn_state != SLAP_C_INVALID );
 842                         c = &connections[(*index)++];
 843                         break;
 844                 }
 845
 846                 assert( connections[*index].c_struct_state == SLAP_C_UNUSED );
 847                 assert( connections[*index].c_conn_state == SLAP_C_INVALID );
 848         }
 849
 850         if( c != NULL ) {
 851                 ldap_pvt_thread_mutex_lock( &c->c_mutex );
 852         }
 853
 854         return c;
 855 }
 856
 857 void connection_done( Connection *c )
 858 {
 859         assert( connections != NULL );
 860
 861         if( c != NULL ) {
 862                 ldap_pvt_thread_mutex_unlock( &c->c_mutex );
 863         }
 864
 865         ldap_pvt_thread_mutex_unlock( &connections_mutex );
 866 }
 867
 868 /*
 869  * connection_activity - handle the request operation op on connection
 870  * conn.  This routine figures out what kind of operation it is and
 871  * calls the appropriate stub to handle it.
 872  */
 873
 874 #ifdef SLAPD_MONITOR
 875 /* FIXME: returns 0 in case of failure */
 876 #define INCR_OP_INITIATED(index) \
 877         do { \
 878                 ldap_pvt_thread_mutex_lock( &slap_counters.sc_ops_mutex ); \
 879                 ldap_pvt_mp_add_ulong(slap_counters.sc_ops_initiated_[(index)], 1); \
 880                 ldap_pvt_thread_mutex_unlock( &slap_counters.sc_ops_mutex ); \
 881         } while (0)
 882 #define INCR_OP_COMPLETED(index) \
 883         do { \
 884                 ldap_pvt_thread_mutex_lock( &slap_counters.sc_ops_mutex ); \
 885                 ldap_pvt_mp_add_ulong(slap_counters.sc_ops_completed, 1); \
 886                 ldap_pvt_mp_add_ulong(slap_counters.sc_ops_completed_[(index)], 1); \
 887                 ldap_pvt_thread_mutex_unlock( &slap_counters.sc_ops_mutex ); \
 888         } while (0)
 889 #else /* !SLAPD_MONITOR */
 890 #define INCR_OP_INITIATED(index)
 891 #define INCR_OP_COMPLETED(index) \
 892         do { \
 893                 ldap_pvt_thread_mutex_lock( &slap_counters.sc_ops_mutex ); \
 894                 ldap_pvt_mp_add_ulong(slap_counters.sc_ops_completed, 1); \
 895                 ldap_pvt_thread_mutex_unlock( &slap_counters.sc_ops_mutex ); \
 896         } while (0)
 897 #endif /* !SLAPD_MONITOR */
 898
 899 /*
 900  * NOTE: keep in sync with enum in slapd.h
 901  */
 902 static int (*opfun[])( Operation *op, SlapReply *rs ) = {
 903         do_bind,
 904         do_unbind,
 905         do_add,
 906         do_delete,
 907         do_modrdn,
 908         do_modify,
 909         do_compare,
 910         do_search,
 911         do_abandon,
 912         do_extended,
 913         NULL
 914 };
 915
 916 static void *
 917 connection_operation( void *ctx, void *arg_v )
 918 {
 919         int rc = LDAP_OTHER;
 920         Operation *op = arg_v;
 921         SlapReply rs = {REP_RESULT};
 922         ber_tag_t tag = op->o_tag;
 923         int opidx = -1;
 924         Connection *conn = op->o_conn;
 925         void *memctx = NULL;
 926         void *memctx_null = NULL;
 927         ber_len_t memsiz;
 928
 929         ldap_pvt_thread_mutex_lock( &slap_counters.sc_ops_mutex );
 930         /* FIXME: returns 0 in case of failure */
 931         ldap_pvt_mp_add_ulong(slap_counters.sc_ops_initiated, 1);
 932         ldap_pvt_thread_mutex_unlock( &slap_counters.sc_ops_mutex );
 933
 934         op->o_threadctx = ctx;
 935
 936         switch ( tag ) {
 937         case LDAP_REQ_BIND:
 938         case LDAP_REQ_UNBIND:
 939         case LDAP_REQ_ADD:
 940         case LDAP_REQ_DELETE:
 941         case LDAP_REQ_MODDN:
 942         case LDAP_REQ_MODIFY:
 943         case LDAP_REQ_COMPARE:
 944         case LDAP_REQ_SEARCH:
 945         case LDAP_REQ_ABANDON:
 946         case LDAP_REQ_EXTENDED:
 947                 break;
 948         default:
 949                 Debug( LDAP_DEBUG_ANY, "connection_operation: "
 950                         "conn %lu unknown LDAP request 0x%lx\n",
 951                         conn->c_connid, tag, 0 );
 952                 op->o_tag = LBER_ERROR;
 953                 rs.sr_err = LDAP_PROTOCOL_ERROR;
 954                 rs.sr_text = "unknown LDAP request";
 955                 send_ldap_disconnect( op, &rs );
 956                 rc = SLAPD_DISCONNECT;
 957                 goto operations_error;
 958         }
 959
 960         if( conn->c_sasl_bind_in_progress && tag != LDAP_REQ_BIND ) {
 961                 Debug( LDAP_DEBUG_ANY, "connection_operation: "
 962                         "error: SASL bind in progress (tag=%ld).\n",
 963                         (long) tag, 0, 0 );
 964                 send_ldap_error( op, &rs, LDAP_OPERATIONS_ERROR,
 965                         "SASL bind in progress" );
 966                 rc = LDAP_OPERATIONS_ERROR;
 967                 goto operations_error;
 968         }
 969
 970         /* We can use Thread-Local storage for most mallocs. We can
 971          * also use TL for ber parsing, but not on Add or Modify.
 972          */
 973 #if 0
 974         memsiz = ber_len( op->o_ber ) * 64;
 975         if ( SLAP_SLAB_SIZE > memsiz ) memsiz = SLAP_SLAB_SIZE;
 976 #endif
 977         memsiz = SLAP_SLAB_SIZE;
 978
 979         memctx = slap_sl_mem_create( memsiz, SLAP_SLAB_STACK, ctx );
 980         op->o_tmpmemctx = memctx;
 981         op->o_tmpmfuncs = &slap_sl_mfuncs;
 982         if ( tag != LDAP_REQ_ADD && tag != LDAP_REQ_MODIFY ) {
 983                 /* Note - the ber and its buffer are already allocated from
 984                  * regular memory; this only affects subsequent mallocs that
 985                  * ber_scanf may invoke.
 986                  */
 987                 ber_set_option( op->o_ber, LBER_OPT_BER_MEMCTX, &memctx );
 988         }
 989
 990         switch ( tag ) {
 991         case LDAP_REQ_BIND:
 992                 opidx = SLAP_OP_BIND;
 993                 break;
 994
 995         case LDAP_REQ_UNBIND:
 996                 opidx = SLAP_OP_UNBIND;
 997                 break;
 998
 999         case LDAP_REQ_ADD:
1000                 opidx = SLAP_OP_ADD;
1001                 break;
1002
1003         case LDAP_REQ_DELETE:
1004                 opidx = SLAP_OP_DELETE;
1005                 break;
1006
1007         case LDAP_REQ_MODRDN:
1008                 opidx = SLAP_OP_MODRDN;
1009                 break;
1010
1011         case LDAP_REQ_MODIFY:
1012                 opidx = SLAP_OP_MODIFY;
1013                 break;
1014
1015         case LDAP_REQ_COMPARE:
1016                 opidx = SLAP_OP_COMPARE;
1017                 break;
1018
1019         case LDAP_REQ_SEARCH:
1020                 opidx = SLAP_OP_SEARCH;
1021                 break;
1022
1023         case LDAP_REQ_ABANDON:
1024                 opidx = SLAP_OP_ABANDON;
1025                 break;
1026
1027         case LDAP_REQ_EXTENDED:
1028                 opidx = SLAP_OP_EXTENDED;
1029                 break;
1030
1031         default:
1032                 /* not reachable */
1033                 assert( 0 );
1034         }
1035
1036         assert( opidx > -1 );
1037         INCR_OP_INITIATED( opidx );
1038         rc = (*(opfun[opidx]))( op, &rs );
1039
1040 operations_error:
1041         if ( rc == SLAPD_DISCONNECT ) {
1042                 tag = LBER_ERROR;
1043
1044         } else if ( opidx > -1 ) {
1045                 /* increment completed operations count
1046                  * only if operation was initiated
1047                  * and rc != SLAPD_DISCONNECT */
1048                 INCR_OP_COMPLETED( opidx );
1049         }
1050
1051         if ( op->o_cancel == SLAP_CANCEL_REQ ) {
1052                 if ( rc == SLAPD_ABANDON )
1053                         op->o_cancel = SLAP_CANCEL_ACK;
1054                 else
1055                         op->o_cancel = LDAP_TOO_LATE;
1056         }
1057         while ( op->o_cancel != SLAP_CANCEL_NONE &&
1058                 op->o_cancel != SLAP_CANCEL_DONE )
1059         {
1060                 ldap_pvt_thread_yield();
1061         }
1062
1063         ldap_pvt_thread_mutex_lock( &conn->c_mutex );
1064
1065         ber_set_option( op->o_ber, LBER_OPT_BER_MEMCTX, &memctx_null );
1066
1067         LDAP_STAILQ_REMOVE( &conn->c_ops, op, slap_op, o_next);
1068         LDAP_STAILQ_NEXT(op, o_next) = NULL;
1069         slap_op_free( op );
1070         conn->c_n_ops_executing--;
1071         conn->c_n_ops_completed++;
1072
1073         switch( tag ) {
1074         case LBER_ERROR:
1075         case LDAP_REQ_UNBIND:
1076                 /* c_mutex is locked */
1077                 connection_closing( conn );
1078                 break;
1079
1080         case LDAP_REQ_BIND:
1081                 conn->c_sasl_bind_in_progress =
1082                         rc == LDAP_SASL_BIND_IN_PROGRESS ? 1 : 0;
1083
1084                 if( conn->c_conn_state == SLAP_C_BINDING) {
1085                         conn->c_conn_state = SLAP_C_ACTIVE;
1086                 }
1087         }
1088
1089         connection_resched( conn );
1090         ldap_pvt_thread_mutex_unlock( &conn->c_mutex );
1091         return NULL;
1092 }
1093
1094 static const Listener dummy_list = { BER_BVC(""), BER_BVC("") };
1095
1096 int connection_client_setup(
1097         ber_socket_t s,
1098         ldap_pvt_thread_start_t *func,
1099         void *arg )
1100 {
1101         int rc;
1102         Connection *c;
1103
1104         rc = connection_init( s, (Listener *)&dummy_list, "", "",
1105                 CONN_IS_CLIENT, 0, NULL );
1106         if ( rc < 0 ) return -1;
1107
1108         c = connection_get( s );
1109         c->c_clientfunc = func;
1110         c->c_clientarg = arg;
1111         connection_return( c );
1112         slapd_add_internal( s, 0 );
1113         slapd_set_read( s, 1 );
1114         return 0;
1115 }
1116
1117 void connection_client_enable(
1118         ber_socket_t s )
1119 {
1120         slapd_set_read( s, 1 );
1121 }
1122
1123 void connection_client_stop(
1124         ber_socket_t s )
1125 {
1126         Connection *c;
1127
1128         /* get (locked) connection */
1129         c = connection_get( s );
1130
1131         assert( c->c_conn_state == SLAP_C_CLIENT );
1132
1133         c->c_listener = NULL;
1134         c->c_conn_state = SLAP_C_INVALID;
1135         c->c_struct_state = SLAP_C_UNUSED;
1136         connection_return( c );
1137         slapd_remove( s, 0, 1 );
1138 }
1139
1140 int connection_read(ber_socket_t s)
1141 {
1142         int rc = 0;
1143         Connection *c;
1144
1145         assert( connections != NULL );
1146
1147         ldap_pvt_thread_mutex_lock( &connections_mutex );
1148
1149         /* get (locked) connection */
1150         c = connection_get( s );
1151
1152         if( c == NULL ) {
1153                 Debug( LDAP_DEBUG_ANY,
1154                         "connection_read(%ld): no connection!\n",
1155                         (long) s, 0, 0 );
1156                 slapd_remove(s, 1, 0);
1157
1158                 ldap_pvt_thread_mutex_unlock( &connections_mutex );
1159                 return -1;
1160         }
1161
1162         c->c_n_read++;
1163
1164         if( c->c_conn_state == SLAP_C_CLOSING ) {
1165                 Debug( LDAP_DEBUG_TRACE,
1166                         "connection_read(%d): closing, ignoring input for id=%lu\n",
1167                         s, c->c_connid, 0 );
1168                 connection_return( c );
1169                 ldap_pvt_thread_mutex_unlock( &connections_mutex );
1170                 return 0;
1171         }
1172
1173         if ( c->c_conn_state == SLAP_C_CLIENT ) {
1174                 slapd_clr_read( s, 0 );
1175                 ldap_pvt_thread_pool_submit( &connection_pool,
1176                         c->c_clientfunc, c->c_clientarg );
1177                 connection_return( c );
1178                 ldap_pvt_thread_mutex_unlock( &connections_mutex );
1179                 return 0;
1180         }
1181
1182         Debug( LDAP_DEBUG_TRACE,
1183                 "connection_read(%d): checking for input on id=%lu\n",
1184                 s, c->c_connid, 0 );
1185
1186 #ifdef HAVE_TLS
1187         if ( c->c_is_tls && c->c_needs_tls_accept ) {
1188                 rc = ldap_pvt_tls_accept( c->c_sb, slap_tls_ctx );
1189                 if ( rc < 0 ) {
1190 #if 0 /* required by next #if 0 */
1191                         struct timeval tv;
1192                         fd_set rfd;
1193 #endif
1194
1195                         Debug( LDAP_DEBUG_TRACE,
1196                                 "connection_read(%d): TLS accept error "
1197                                 "error=%d id=%lu, closing\n",
1198                                 s, rc, c->c_connid );
1199                         c->c_needs_tls_accept = 0;
1200                         /* connections_mutex and c_mutex are locked */
1201                         connection_closing( c );
1202
1203 #if 0
1204                         /* Drain input before close, to allow SSL error codes
1205                          * to propagate to client. */
1206                         FD_ZERO(&rfd);
1207                         FD_SET(s, &rfd);
1208                         for (rc=1; rc>0;) {
1209                                 tv.tv_sec = 1;
1210                                 tv.tv_usec = 0;
1211                                 rc = select(s+1, &rfd, NULL, NULL, &tv);
1212                                 if (rc == 1) {
1213                                         ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_DRAIN, NULL);
1214                                 }
1215                         }
1216 #endif
1217                         connection_close( c );
1218
1219                 } else if ( rc == 0 ) {
1220                         void *ssl;
1221                         struct berval authid = BER_BVNULL;
1222
1223                         c->c_needs_tls_accept = 0;
1224
1225                         /* we need to let SASL know */
1226                         ssl = ldap_pvt_tls_sb_ctx( c->c_sb );
1227
1228                         c->c_tls_ssf = (slap_ssf_t) ldap_pvt_tls_get_strength( ssl );
1229                         if( c->c_tls_ssf > c->c_ssf ) {
1230                                 c->c_ssf = c->c_tls_ssf;
1231                         }
1232
1233                         rc = dnX509peerNormalize( ssl, &authid );
1234                         if ( rc != LDAP_SUCCESS ) {
1235                                 Debug( LDAP_DEBUG_TRACE, "connection_read(%d): "
1236                                         "unable to get TLS client DN, error=%d id=%lu\n",
1237                                         s, rc, c->c_connid );
1238                         }
1239                         slap_sasl_external( c, c->c_tls_ssf, &authid );
1240                         if ( authid.bv_val ) free( authid.bv_val );
1241                 }
1242
1243                 /* if success and data is ready, fall thru to data input loop */
1244                 if( rc != 0 ||
1245                         !ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_DATA_READY, NULL ) )
1246                 {
1247                         connection_return( c );
1248                         ldap_pvt_thread_mutex_unlock( &connections_mutex );
1249                         return 0;
1250                 }
1251         }
1252 #endif
1253
1254 #ifdef HAVE_CYRUS_SASL
1255         if ( c->c_sasl_layers ) {
1256                 /* If previous layer is not removed yet, give up for now */
1257                 if ( !c->c_sasl_sockctx ) {
1258                         connection_return( c );
1259                         ldap_pvt_thread_mutex_unlock( &connections_mutex );
1260                         return 0;
1261                 }
1262
1263                 c->c_sasl_layers = 0;
1264
1265                 rc = ldap_pvt_sasl_install( c->c_sb, c->c_sasl_sockctx );
1266
1267                 if( rc != LDAP_SUCCESS ) {
1268                         Debug( LDAP_DEBUG_TRACE,
1269                                 "connection_read(%d): SASL install error "
1270                                 "error=%d id=%lu, closing\n",
1271                                 s, rc, c->c_connid );
1272                         /* connections_mutex and c_mutex are locked */
1273                         connection_closing( c );
1274                         connection_close( c );
1275                         connection_return( c );
1276                         ldap_pvt_thread_mutex_unlock( &connections_mutex );
1277                         return 0;
1278                 }
1279         }
1280 #endif
1281
1282 #define CONNECTION_INPUT_LOOP 1
1283 /* #define      DATA_READY_LOOP 1 */
1284
1285         do {
1286                 /* How do we do this without getting into a busy loop ? */
1287                 rc = connection_input( c );
1288         }
1289 #ifdef DATA_READY_LOOP
1290         while( !rc && ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_DATA_READY, NULL ));
1291 #elif CONNECTION_INPUT_LOOP
1292         while(!rc);
1293 #else
1294         while(0);
1295 #endif
1296
1297         if( rc < 0 ) {
1298                 Debug( LDAP_DEBUG_TRACE,
1299                         "connection_read(%d): input error=%d id=%lu, closing.\n",
1300                         s, rc, c->c_connid );
1301                 /* connections_mutex and c_mutex are locked */
1302                 connection_closing( c );
1303                 connection_close( c );
1304                 connection_return( c );
1305                 ldap_pvt_thread_mutex_unlock( &connections_mutex );
1306                 return 0;
1307         }
1308
1309         if ( ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_NEEDS_READ, NULL ) ) {
1310                 slapd_set_read( s, 1 );
1311         }
1312
1313         if ( ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_NEEDS_WRITE, NULL ) ) {
1314                 slapd_set_write( s, 1 );
1315         }
1316
1317         connection_return( c );
1318         ldap_pvt_thread_mutex_unlock( &connections_mutex );
1319         return 0;
1320 }
1321
1322 static int
1323 connection_input(
1324         Connection *conn )
1325 {
1326         Operation *op;
1327         ber_tag_t       tag;
1328         ber_len_t       len;
1329         ber_int_t       msgid;
1330         BerElement      *ber;
1331         int             rc;
1332 #ifdef LDAP_CONNECTIONLESS
1333         Sockaddr        peeraddr;
1334         char            *cdn = NULL;
1335 #endif
1336         char *defer = NULL;
1337
1338         if ( conn->c_currentber == NULL &&
1339                 ( conn->c_currentber = ber_alloc()) == NULL )
1340         {
1341                 Debug( LDAP_DEBUG_ANY, "ber_alloc failed\n", 0, 0, 0 );
1342                 return -1;
1343         }
1344
1345         errno = 0;
1346
1347 #ifdef LDAP_CONNECTIONLESS
1348         if ( conn->c_is_udp ) {
1349                 char    peername[sizeof("IP=255.255.255.255:65336")];
1350                 len = ber_int_sb_read(conn->c_sb, &peeraddr,
1351                         sizeof(struct sockaddr));
1352                 if (len != sizeof(struct sockaddr))
1353                         return 1;
1354                 sprintf( peername, "IP=%s:%d",
1355                         inet_ntoa( peeraddr.sa_in_addr.sin_addr ),
1356                         (unsigned) ntohs( peeraddr.sa_in_addr.sin_port ) );
1357                 Statslog( LDAP_DEBUG_STATS,
1358                         "conn=%lu UDP request from %s (%s) accepted.\n",
1359                         conn->c_connid, peername, conn->c_sock_name.bv_val, 0, 0 );
1360         }
1361 #endif
1362         tag = ber_get_next( conn->c_sb, &len, conn->c_currentber );
1363         if ( tag != LDAP_TAG_MESSAGE ) {
1364                 int err = errno;
1365                 ber_socket_t    sd;
1366
1367                 ber_sockbuf_ctrl( conn->c_sb, LBER_SB_OPT_GET_FD, &sd );
1368
1369                 Debug( LDAP_DEBUG_TRACE,
1370                         "ber_get_next on fd %d failed errno=%d (%s)\n",
1371                         sd, err, sock_errstr(err) );
1372                 if ( err != EWOULDBLOCK && err != EAGAIN ) {
1373                         /* log, close and send error */
1374                         ber_free( conn->c_currentber, 1 );
1375                         conn->c_currentber = NULL;
1376
1377                         return -2;
1378                 }
1379                 return 1;
1380         }
1381
1382         ber = conn->c_currentber;
1383         conn->c_currentber = NULL;
1384
1385         if ( (tag = ber_get_int( ber, &msgid )) != LDAP_TAG_MSGID ) {
1386                 /* log, close and send error */
1387                 Debug( LDAP_DEBUG_ANY, "ber_get_int returns 0x%lx\n",
1388                         tag, 0, 0 );
1389                 ber_free( ber, 1 );
1390                 return -1;
1391         }
1392
1393         if ( (tag = ber_peek_tag( ber, &len )) == LBER_ERROR ) {
1394                 /* log, close and send error */
1395                 Debug( LDAP_DEBUG_ANY, "ber_peek_tag returns 0x%lx\n",
1396                         tag, 0, 0 );
1397                 ber_free( ber, 1 );
1398
1399                 return -1;
1400         }
1401
1402 #ifdef LDAP_CONNECTIONLESS
1403         if( conn->c_is_udp ) {
1404                 if( tag == LBER_OCTETSTRING ) {
1405                         ber_get_stringa( ber, &cdn );
1406                         tag = ber_peek_tag(ber, &len);
1407                 }
1408                 if( tag != LDAP_REQ_ABANDON && tag != LDAP_REQ_SEARCH ) {
1409                         Debug( LDAP_DEBUG_ANY, "invalid req for UDP 0x%lx\n", tag, 0, 0 );
1410                         ber_free( ber, 1 );
1411                         return 0;
1412                 }
1413         }
1414 #endif
1415         if(tag == LDAP_REQ_BIND) {
1416                 /* immediately abandon all existing operations upon BIND */
1417                 connection_abandon( conn );
1418         }
1419
1420         op = slap_op_alloc( ber, msgid, tag, conn->c_n_ops_received++ );
1421
1422         op->o_conn = conn;
1423         /* clear state if the connection is being reused from inactive */
1424         if ( conn->c_conn_state == SLAP_C_INACTIVE ) {
1425                 memset( &conn->c_pagedresults_state, 0, sizeof( conn->c_pagedresults_state ) );
1426         }
1427
1428         op->o_res_ber = NULL;
1429
1430 #ifdef LDAP_CONNECTIONLESS
1431         if (conn->c_is_udp) {
1432                 if ( cdn ) {
1433                         ber_str2bv( cdn, 0, 1, &op->o_dn );
1434                         op->o_protocol = LDAP_VERSION2;
1435                 }
1436                 op->o_res_ber = ber_alloc_t( LBER_USE_DER );
1437                 if (op->o_res_ber == NULL) return 1;
1438
1439                 rc = ber_write( op->o_res_ber, (char *)&peeraddr,
1440                         sizeof(struct sockaddr), 0 );
1441
1442                 if (rc != sizeof(struct sockaddr)) {
1443                         Debug( LDAP_DEBUG_ANY, "ber_write failed\n", 0, 0, 0 );
1444                         return 1;
1445                 }
1446
1447                 if (op->o_protocol == LDAP_VERSION2) {
1448                         rc = ber_printf(op->o_res_ber, "{is{" /*}}*/, op->o_msgid, "");
1449                         if (rc == -1) {
1450                                 Debug( LDAP_DEBUG_ANY, "ber_write failed\n", 0, 0, 0 );
1451                                 return rc;
1452                         }
1453                 }
1454         }
1455 #endif /* LDAP_CONNECTIONLESS */
1456
1457         rc = 0;
1458
1459         /* Don't process requests when the conn is in the middle of a
1460          * Bind, or if it's closing. Also, don't let any single conn
1461          * use up all the available threads, and don't execute if we're
1462          * currently blocked on output. And don't execute if there are
1463          * already pending ops, let them go first.  Abandon operations
1464          * get exceptions to some, but not all, cases.
1465          */
1466         if (tag != LDAP_REQ_ABANDON && conn->c_conn_state == SLAP_C_CLOSING) {
1467                 defer = "closing";
1468         } else if (tag != LDAP_REQ_ABANDON && conn->c_writewaiter) {
1469                 defer = "awaiting write";
1470         } else if (conn->c_n_ops_executing >= connection_pool_max/2) {
1471                 defer = "too many executing";
1472         } else if (conn->c_conn_state == SLAP_C_BINDING) {
1473                 defer = "binding";
1474         } else if (tag != LDAP_REQ_ABANDON && conn->c_n_ops_pending) {
1475                 defer = "pending operations";
1476         }
1477
1478         if( defer ) {
1479                 int max = conn->c_dn.bv_len
1480                         ? slap_conn_max_pending_auth
1481                         : slap_conn_max_pending;
1482
1483                 Debug( LDAP_DEBUG_ANY,
1484                         "connection_input: conn=%lu deferring operation: %s\n",
1485                         conn->c_connid, defer, 0 );
1486                 conn->c_n_ops_pending++;
1487                 LDAP_STAILQ_INSERT_TAIL( &conn->c_pending_ops, op, o_next );
1488                 if ( conn->c_n_ops_pending > max ) {
1489                         rc = -1;
1490                 } else {
1491                         rc = 1;
1492                 }
1493         } else {
1494                 conn->c_n_ops_executing++;
1495                 connection_op_activate( op );
1496         }
1497
1498 #ifdef NO_THREADS
1499         if ( conn->c_struct_state != SLAP_C_USED ) {
1500                 /* connection must have got closed underneath us */
1501                 return 1;
1502         }
1503 #endif
1504         assert( conn->c_struct_state == SLAP_C_USED );
1505
1506         return rc;
1507 }
1508
1509 static int
1510 connection_resched( Connection *conn )
1511 {
1512         Operation *op;
1513
1514         if( conn->c_conn_state == SLAP_C_CLOSING ) {
1515                 int rc;
1516                 ber_socket_t    sd;
1517                 ber_sockbuf_ctrl( conn->c_sb, LBER_SB_OPT_GET_FD, &sd );
1518
1519                 /* use trylock to avoid possible deadlock */
1520                 rc = ldap_pvt_thread_mutex_trylock( &connections_mutex );
1521
1522                 if( rc ) {
1523                         Debug( LDAP_DEBUG_TRACE,
1524                                 "connection_resched: reaquiring locks conn=%lu sd=%d\n",
1525                                 conn->c_connid, sd, 0 );
1526                         /*
1527                          * reaquire locks in the right order...
1528                          * this may allow another thread to close this connection,
1529                          * so recheck state below.
1530                          */
1531                         ldap_pvt_thread_mutex_unlock( &conn->c_mutex );
1532                         ldap_pvt_thread_mutex_lock( &connections_mutex );
1533                         ldap_pvt_thread_mutex_lock( &conn->c_mutex );
1534                 }
1535
1536                 if( conn->c_conn_state != SLAP_C_CLOSING ) {
1537                         Debug( LDAP_DEBUG_TRACE, "connection_resched: "
1538                                 "closed by other thread conn=%lu sd=%d\n",
1539                                 conn->c_connid, sd, 0 );
1540                 } else {
1541                         Debug( LDAP_DEBUG_TRACE, "connection_resched: "
1542                                 "attempting closing conn=%lu sd=%d\n",
1543                                 conn->c_connid, sd, 0 );
1544                         connection_close( conn );
1545                 }
1546
1547                 ldap_pvt_thread_mutex_unlock( &connections_mutex );
1548                 return 0;
1549         }
1550
1551         if( conn->c_conn_state != SLAP_C_ACTIVE || conn->c_writewaiter ) {
1552                 /* other states need different handling */
1553                 return 0;
1554         }
1555
1556         while ((op = LDAP_STAILQ_FIRST( &conn->c_pending_ops )) != NULL) {
1557                 if ( conn->c_n_ops_executing > connection_pool_max/2 ) {
1558                         break;
1559                 }
1560                 LDAP_STAILQ_REMOVE_HEAD( &conn->c_pending_ops, o_next );
1561                 LDAP_STAILQ_NEXT(op, o_next) = NULL;
1562                 /* pending operations should not be marked for abandonment */
1563                 assert(!op->o_abandon);
1564
1565                 conn->c_n_ops_pending--;
1566                 conn->c_n_ops_executing++;
1567
1568                 connection_op_activate( op );
1569
1570                 if ( conn->c_conn_state == SLAP_C_BINDING ) {
1571                         break;
1572                 }
1573         }
1574         return 0;
1575 }
1576
1577 static void
1578 connection_init_log_prefix( Operation *op )
1579 {
1580         if ( op->o_connid == (unsigned long)(-1) ) {
1581                 snprintf( op->o_log_prefix, sizeof( op->o_log_prefix ),
1582                                 "conn=-1 op=%lu", op->o_opid );
1583
1584         } else {
1585                 snprintf( op->o_log_prefix, sizeof( op->o_log_prefix ),
1586                                 "conn=%lu op=%lu", op->o_connid, op->o_opid );
1587         }
1588 }
1589
1590 static int connection_op_activate( Operation *op )
1591 {
1592         int status;
1593         ber_tag_t tag = op->o_tag;
1594
1595         if(tag == LDAP_REQ_BIND) {
1596                 op->o_conn->c_conn_state = SLAP_C_BINDING;
1597         }
1598
1599         if (!op->o_dn.bv_len) {
1600                 op->o_authz = op->o_conn->c_authz;
1601                 ber_dupbv( &op->o_dn, &op->o_conn->c_dn );
1602                 ber_dupbv( &op->o_ndn, &op->o_conn->c_ndn );
1603         }
1604         op->o_authtype = op->o_conn->c_authtype;
1605         ber_dupbv( &op->o_authmech, &op->o_conn->c_authmech );
1606
1607         if (!op->o_protocol) {
1608                 op->o_protocol = op->o_conn->c_protocol
1609                         ? op->o_conn->c_protocol : LDAP_VERSION3;
1610         }
1611         if (op->o_conn->c_conn_state == SLAP_C_INACTIVE
1612                 && op->o_protocol > LDAP_VERSION2)
1613         {
1614                 op->o_conn->c_conn_state = SLAP_C_ACTIVE;
1615         }
1616
1617         op->o_connid = op->o_conn->c_connid;
1618         connection_init_log_prefix( op );
1619
1620         LDAP_STAILQ_INSERT_TAIL( &op->o_conn->c_ops, op, o_next );
1621
1622         status = ldap_pvt_thread_pool_submit( &connection_pool,
1623                 connection_operation, (void *) op );
1624
1625         if ( status != 0 ) {
1626                 Debug( LDAP_DEBUG_ANY,
1627                         "ldap_pvt_thread_pool_submit: failed (%d) for conn=%lu\n",
1628                         status, op->o_connid, 0 );
1629                 /* should move op to pending list */
1630         }
1631
1632         return status;
1633 }
1634
1635 int connection_write(ber_socket_t s)
1636 {
1637         Connection *c;
1638         Operation *op;
1639
1640         assert( connections != NULL );
1641
1642         ldap_pvt_thread_mutex_lock( &connections_mutex );
1643
1644         c = connection_get( s );
1645
1646         if( c == NULL ) {
1647                 Debug( LDAP_DEBUG_ANY,
1648                         "connection_write(%ld): no connection!\n",
1649                         (long)s, 0, 0 );
1650                 slapd_remove(s, 1, 0);
1651                 ldap_pvt_thread_mutex_unlock( &connections_mutex );
1652                 return -1;
1653         }
1654
1655         slapd_clr_write( s, 0);
1656
1657         c->c_n_write++;
1658
1659         Debug( LDAP_DEBUG_TRACE,
1660                 "connection_write(%d): waking output for id=%lu\n",
1661                 s, c->c_connid, 0 );
1662         ldap_pvt_thread_cond_signal( &c->c_write_cv );
1663
1664         if ( ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_NEEDS_READ, NULL ) ) {
1665                 slapd_set_read( s, 1 );
1666         }
1667         if ( ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_NEEDS_WRITE, NULL ) ) {
1668                 slapd_set_write( s, 1 );
1669         }
1670         /* If there are ops pending because of a writewaiter, start
1671          * one up.
1672          */
1673         while ((op = LDAP_STAILQ_FIRST( &c->c_pending_ops )) != NULL) {
1674                 if ( !c->c_writewaiter ) break;
1675                 if ( c->c_n_ops_executing > connection_pool_max/2 ) {
1676                         break;
1677                 }
1678                 LDAP_STAILQ_REMOVE_HEAD( &c->c_pending_ops, o_next );
1679                 LDAP_STAILQ_NEXT(op, o_next) = NULL;
1680                 /* pending operations should not be marked for abandonment */
1681                 assert(!op->o_abandon);
1682
1683                 c->c_n_ops_pending--;
1684                 c->c_n_ops_executing++;
1685
1686                 connection_op_activate( op );
1687
1688                 break;
1689         }
1690         connection_return( c );
1691         ldap_pvt_thread_mutex_unlock( &connections_mutex );
1692         return 0;
1693 }
1694
1695 void
1696 connection_fake_init(
1697         Connection *conn,
1698         Operation *op,
1699         void *ctx )
1700 {
1701         conn->c_connid = -1;
1702         conn->c_send_ldap_result = slap_send_ldap_result;
1703         conn->c_send_search_entry = slap_send_search_entry;
1704         conn->c_send_search_reference = slap_send_search_reference;
1705         conn->c_listener = (Listener *)&dummy_list;
1706         conn->c_peer_domain = slap_empty_bv;
1707         conn->c_peer_name = slap_empty_bv;
1708
1709         memset(op, 0, OPERATION_BUFFER_SIZE);
1710         op->o_hdr = (Opheader *)(op+1);
1711         op->o_controls = (void **)(op->o_hdr+1);
1712         /* set memory context */
1713         op->o_tmpmemctx = slap_sl_mem_create(SLAP_SLAB_SIZE, SLAP_SLAB_STACK, ctx);
1714         op->o_tmpmfuncs = &slap_sl_mfuncs;
1715         op->o_threadctx = ctx;
1716
1717         op->o_conn = conn;
1718         op->o_connid = op->o_conn->c_connid;
1719         connection_init_log_prefix( op );
1720
1721         op->o_time = slap_get_time();
1722 }
1723
1724 void
1725 connection_assign_nextid( Connection *conn )
1726 {
1727         ldap_pvt_thread_mutex_lock( &conn_nextid_mutex );
1728         conn->c_connid = conn_nextid++;
1729         ldap_pvt_thread_mutex_unlock( &conn_nextid_mutex );
1730 }
1731