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 1998-2004 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                 op->o_cancel = LDAP_TOO_LATE;
1053         }
1054         while ( op->o_cancel != SLAP_CANCEL_NONE &&
1055                 op->o_cancel != SLAP_CANCEL_DONE )
1056         {
1057                 ldap_pvt_thread_yield();
1058         }
1059
1060         ldap_pvt_thread_mutex_lock( &conn->c_mutex );
1061
1062         ber_set_option( op->o_ber, LBER_OPT_BER_MEMCTX, &memctx_null );
1063
1064 #if 0   /* DELETE ME */
1065         if ( op->o_cancel != SLAP_CANCEL_ACK &&
1066                 ( op->o_sync_mode & SLAP_SYNC_PERSIST ) )
1067         {
1068                 slap_sl_mem_detach( ctx, memctx );
1069         } else if ( op->o_sync_slog_size != -1 ) {
1070                 slap_sl_mem_detach( ctx, memctx );
1071                 LDAP_STAILQ_REMOVE( &conn->c_ops, op, slap_op, o_next);
1072                 LDAP_STAILQ_NEXT(op, o_next) = NULL;
1073                 conn->c_n_ops_executing--;
1074                 conn->c_n_ops_completed++;
1075
1076         } else
1077 #endif
1078         {
1079                 LDAP_STAILQ_REMOVE( &conn->c_ops, op, slap_op, o_next);
1080                 LDAP_STAILQ_NEXT(op, o_next) = NULL;
1081                 slap_op_free( op );
1082                 conn->c_n_ops_executing--;
1083                 conn->c_n_ops_completed++;
1084         }
1085
1086         switch( tag ) {
1087         case LBER_ERROR:
1088         case LDAP_REQ_UNBIND:
1089                 /* c_mutex is locked */
1090                 connection_closing( conn );
1091                 break;
1092
1093         case LDAP_REQ_BIND:
1094                 conn->c_sasl_bind_in_progress =
1095                         rc == LDAP_SASL_BIND_IN_PROGRESS ? 1 : 0;
1096
1097                 if( conn->c_conn_state == SLAP_C_BINDING) {
1098                         conn->c_conn_state = SLAP_C_ACTIVE;
1099                 }
1100         }
1101
1102         connection_resched( conn );
1103         ldap_pvt_thread_mutex_unlock( &conn->c_mutex );
1104         return NULL;
1105 }
1106
1107 static const Listener dummy_list = { BER_BVC(""), BER_BVC("") };
1108
1109 int connection_client_setup(
1110         ber_socket_t s,
1111         ldap_pvt_thread_start_t *func,
1112         void *arg )
1113 {
1114         int rc;
1115         Connection *c;
1116
1117         rc = connection_init( s, (Listener *)&dummy_list, "", "",
1118                 CONN_IS_CLIENT, 0, NULL );
1119         if ( rc < 0 ) return -1;
1120
1121         c = connection_get( s );
1122         c->c_clientfunc = func;
1123         c->c_clientarg = arg;
1124         connection_return( c );
1125         slapd_add_internal( s, 0 );
1126         slapd_set_read( s, 1 );
1127         return 0;
1128 }
1129
1130 void connection_client_enable(
1131         ber_socket_t s )
1132 {
1133         slapd_set_read( s, 1 );
1134 }
1135
1136 void connection_client_stop(
1137         ber_socket_t s )
1138 {
1139         Connection *c;
1140
1141         /* get (locked) connection */
1142         c = connection_get( s );
1143
1144         assert( c->c_conn_state == SLAP_C_CLIENT );
1145
1146         c->c_listener = NULL;
1147         c->c_conn_state = SLAP_C_INVALID;
1148         c->c_struct_state = SLAP_C_UNUSED;
1149         connection_return( c );
1150         slapd_remove( s, 0, 1 );
1151 }
1152
1153 int connection_read(ber_socket_t s)
1154 {
1155         int rc = 0;
1156         Connection *c;
1157
1158         assert( connections != NULL );
1159
1160         ldap_pvt_thread_mutex_lock( &connections_mutex );
1161
1162         /* get (locked) connection */
1163         c = connection_get( s );
1164
1165         if( c == NULL ) {
1166                 Debug( LDAP_DEBUG_ANY,
1167                         "connection_read(%ld): no connection!\n",
1168                         (long) s, 0, 0 );
1169                 slapd_remove(s, 1, 0);
1170
1171                 ldap_pvt_thread_mutex_unlock( &connections_mutex );
1172                 return -1;
1173         }
1174
1175         c->c_n_read++;
1176
1177         if( c->c_conn_state == SLAP_C_CLOSING ) {
1178                 Debug( LDAP_DEBUG_TRACE,
1179                         "connection_read(%d): closing, ignoring input for id=%lu\n",
1180                         s, c->c_connid, 0 );
1181                 connection_return( c );
1182                 ldap_pvt_thread_mutex_unlock( &connections_mutex );
1183                 return 0;
1184         }
1185
1186         if ( c->c_conn_state == SLAP_C_CLIENT ) {
1187                 slapd_clr_read( s, 0 );
1188                 ldap_pvt_thread_pool_submit( &connection_pool,
1189                         c->c_clientfunc, c->c_clientarg );
1190                 connection_return( c );
1191                 ldap_pvt_thread_mutex_unlock( &connections_mutex );
1192                 return 0;
1193         }
1194
1195         Debug( LDAP_DEBUG_TRACE,
1196                 "connection_read(%d): checking for input on id=%lu\n",
1197                 s, c->c_connid, 0 );
1198
1199 #ifdef HAVE_TLS
1200         if ( c->c_is_tls && c->c_needs_tls_accept ) {
1201                 rc = ldap_pvt_tls_accept( c->c_sb, slap_tls_ctx );
1202                 if ( rc < 0 ) {
1203 #if 0 /* required by next #if 0 */
1204                         struct timeval tv;
1205                         fd_set rfd;
1206 #endif
1207
1208                         Debug( LDAP_DEBUG_TRACE,
1209                                 "connection_read(%d): TLS accept error "
1210                                 "error=%d id=%lu, closing\n",
1211                                 s, rc, c->c_connid );
1212                         c->c_needs_tls_accept = 0;
1213                         /* connections_mutex and c_mutex are locked */
1214                         connection_closing( c );
1215
1216 #if 0
1217                         /* Drain input before close, to allow SSL error codes
1218                          * to propagate to client. */
1219                         FD_ZERO(&rfd);
1220                         FD_SET(s, &rfd);
1221                         for (rc=1; rc>0;) {
1222                                 tv.tv_sec = 1;
1223                                 tv.tv_usec = 0;
1224                                 rc = select(s+1, &rfd, NULL, NULL, &tv);
1225                                 if (rc == 1) {
1226                                         ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_DRAIN, NULL);
1227                                 }
1228                         }
1229 #endif
1230                         connection_close( c );
1231
1232                 } else if ( rc == 0 ) {
1233                         void *ssl;
1234                         struct berval authid = BER_BVNULL;
1235
1236                         c->c_needs_tls_accept = 0;
1237
1238                         /* we need to let SASL know */
1239                         ssl = ldap_pvt_tls_sb_ctx( c->c_sb );
1240
1241                         c->c_tls_ssf = (slap_ssf_t) ldap_pvt_tls_get_strength( ssl );
1242                         if( c->c_tls_ssf > c->c_ssf ) {
1243                                 c->c_ssf = c->c_tls_ssf;
1244                         }
1245
1246                         rc = dnX509peerNormalize( ssl, &authid );
1247                         if ( rc != LDAP_SUCCESS ) {
1248                                 Debug( LDAP_DEBUG_TRACE, "connection_read(%d): "
1249                                         "unable to get TLS client DN, error=%d id=%lu\n",
1250                                         s, rc, c->c_connid );
1251                         }
1252                         slap_sasl_external( c, c->c_tls_ssf, &authid );
1253                         if ( authid.bv_val ) free( authid.bv_val );
1254                 }
1255
1256                 /* if success and data is ready, fall thru to data input loop */
1257                 if( rc != 0 ||
1258                         !ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_DATA_READY, NULL ) )
1259                 {
1260                         connection_return( c );
1261                         ldap_pvt_thread_mutex_unlock( &connections_mutex );
1262                         return 0;
1263                 }
1264         }
1265 #endif
1266
1267 #ifdef HAVE_CYRUS_SASL
1268         if ( c->c_sasl_layers ) {
1269                 /* If previous layer is not removed yet, give up for now */
1270                 if ( !c->c_sasl_sockctx ) {
1271                         connection_return( c );
1272                         ldap_pvt_thread_mutex_unlock( &connections_mutex );
1273                         return 0;
1274                 }
1275
1276                 c->c_sasl_layers = 0;
1277
1278                 rc = ldap_pvt_sasl_install( c->c_sb, c->c_sasl_sockctx );
1279
1280                 if( rc != LDAP_SUCCESS ) {
1281                         Debug( LDAP_DEBUG_TRACE,
1282                                 "connection_read(%d): SASL install error "
1283                                 "error=%d id=%lu, closing\n",
1284                                 s, rc, c->c_connid );
1285                         /* connections_mutex and c_mutex are locked */
1286                         connection_closing( c );
1287                         connection_close( c );
1288                         connection_return( c );
1289                         ldap_pvt_thread_mutex_unlock( &connections_mutex );
1290                         return 0;
1291                 }
1292         }
1293 #endif
1294
1295 #define CONNECTION_INPUT_LOOP 1
1296 /* #define      DATA_READY_LOOP 1 */
1297
1298         do {
1299                 /* How do we do this without getting into a busy loop ? */
1300                 rc = connection_input( c );
1301         }
1302 #ifdef DATA_READY_LOOP
1303         while( !rc && ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_DATA_READY, NULL ));
1304 #elif CONNECTION_INPUT_LOOP
1305         while(!rc);
1306 #else
1307         while(0);
1308 #endif
1309
1310         if( rc < 0 ) {
1311                 Debug( LDAP_DEBUG_TRACE,
1312                         "connection_read(%d): input error=%d id=%lu, closing.\n",
1313                         s, rc, c->c_connid );
1314                 /* connections_mutex and c_mutex are locked */
1315                 connection_closing( c );
1316                 connection_close( c );
1317                 connection_return( c );
1318                 ldap_pvt_thread_mutex_unlock( &connections_mutex );
1319                 return 0;
1320         }
1321
1322         if ( ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_NEEDS_READ, NULL ) ) {
1323                 slapd_set_read( s, 1 );
1324         }
1325
1326         if ( ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_NEEDS_WRITE, NULL ) ) {
1327                 slapd_set_write( s, 1 );
1328         }
1329
1330         connection_return( c );
1331         ldap_pvt_thread_mutex_unlock( &connections_mutex );
1332         return 0;
1333 }
1334
1335 static int
1336 connection_input(
1337         Connection *conn )
1338 {
1339         Operation *op;
1340         ber_tag_t       tag;
1341         ber_len_t       len;
1342         ber_int_t       msgid;
1343         BerElement      *ber;
1344         int             rc;
1345 #ifdef LDAP_CONNECTIONLESS
1346         Sockaddr        peeraddr;
1347         char            *cdn = NULL;
1348 #endif
1349         char *defer = NULL;
1350
1351         if ( conn->c_currentber == NULL &&
1352                 ( conn->c_currentber = ber_alloc()) == NULL )
1353         {
1354                 Debug( LDAP_DEBUG_ANY, "ber_alloc failed\n", 0, 0, 0 );
1355                 return -1;
1356         }
1357
1358         errno = 0;
1359
1360 #ifdef LDAP_CONNECTIONLESS
1361         if ( conn->c_is_udp ) {
1362                 char    peername[sizeof("IP=255.255.255.255:65336")];
1363                 len = ber_int_sb_read(conn->c_sb, &peeraddr,
1364                         sizeof(struct sockaddr));
1365                 if (len != sizeof(struct sockaddr))
1366                         return 1;
1367                 sprintf( peername, "IP=%s:%d",
1368                         inet_ntoa( peeraddr.sa_in_addr.sin_addr ),
1369                         (unsigned) ntohs( peeraddr.sa_in_addr.sin_port ) );
1370                 Statslog( LDAP_DEBUG_STATS,
1371                         "conn=%lu UDP request from %s (%s) accepted.\n",
1372                         conn->c_connid, peername, conn->c_sock_name.bv_val, 0, 0 );
1373         }
1374 #endif
1375         tag = ber_get_next( conn->c_sb, &len, conn->c_currentber );
1376         if ( tag != LDAP_TAG_MESSAGE ) {
1377                 int err = errno;
1378                 ber_socket_t    sd;
1379
1380                 ber_sockbuf_ctrl( conn->c_sb, LBER_SB_OPT_GET_FD, &sd );
1381
1382                 Debug( LDAP_DEBUG_TRACE,
1383                         "ber_get_next on fd %d failed errno=%d (%s)\n",
1384                         sd, err, sock_errstr(err) );
1385                 if ( err != EWOULDBLOCK && err != EAGAIN ) {
1386                         /* log, close and send error */
1387                         ber_free( conn->c_currentber, 1 );
1388                         conn->c_currentber = NULL;
1389
1390                         return -2;
1391                 }
1392                 return 1;
1393         }
1394
1395         ber = conn->c_currentber;
1396         conn->c_currentber = NULL;
1397
1398         if ( (tag = ber_get_int( ber, &msgid )) != LDAP_TAG_MSGID ) {
1399                 /* log, close and send error */
1400                 Debug( LDAP_DEBUG_ANY, "ber_get_int returns 0x%lx\n",
1401                         tag, 0, 0 );
1402                 ber_free( ber, 1 );
1403                 return -1;
1404         }
1405
1406         if ( (tag = ber_peek_tag( ber, &len )) == LBER_ERROR ) {
1407                 /* log, close and send error */
1408                 Debug( LDAP_DEBUG_ANY, "ber_peek_tag returns 0x%lx\n",
1409                         tag, 0, 0 );
1410                 ber_free( ber, 1 );
1411
1412                 return -1;
1413         }
1414
1415 #ifdef LDAP_CONNECTIONLESS
1416         if( conn->c_is_udp ) {
1417                 if( tag == LBER_OCTETSTRING ) {
1418                         ber_get_stringa( ber, &cdn );
1419                         tag = ber_peek_tag(ber, &len);
1420                 }
1421                 if( tag != LDAP_REQ_ABANDON && tag != LDAP_REQ_SEARCH ) {
1422                         Debug( LDAP_DEBUG_ANY, "invalid req for UDP 0x%lx\n", tag, 0, 0 );
1423                         ber_free( ber, 1 );
1424                         return 0;
1425                 }
1426         }
1427 #endif
1428         if(tag == LDAP_REQ_BIND) {
1429                 /* immediately abandon all exiting operations upon BIND */
1430                 connection_abandon( conn );
1431         }
1432
1433         op = slap_op_alloc( ber, msgid, tag, conn->c_n_ops_received++ );
1434
1435         op->o_conn = conn;
1436         /* clear state if the connection is being reused from inactive */
1437         if ( conn->c_conn_state == SLAP_C_INACTIVE ) {
1438                 memset( &conn->c_pagedresults_state, 0, sizeof( conn->c_pagedresults_state ) );
1439         }
1440
1441         op->o_res_ber = NULL;
1442
1443 #ifdef LDAP_CONNECTIONLESS
1444         if (conn->c_is_udp) {
1445                 if ( cdn ) {
1446                         ber_str2bv( cdn, 0, 1, &op->o_dn );
1447                         op->o_protocol = LDAP_VERSION2;
1448                 }
1449                 op->o_res_ber = ber_alloc_t( LBER_USE_DER );
1450                 if (op->o_res_ber == NULL) return 1;
1451
1452                 rc = ber_write( op->o_res_ber, (char *)&peeraddr,
1453                         sizeof(struct sockaddr), 0 );
1454
1455                 if (rc != sizeof(struct sockaddr)) {
1456                         Debug( LDAP_DEBUG_ANY, "ber_write failed\n", 0, 0, 0 );
1457                         return 1;
1458                 }
1459
1460                 if (op->o_protocol == LDAP_VERSION2) {
1461                         rc = ber_printf(op->o_res_ber, "{is{" /*}}*/, op->o_msgid, "");
1462                         if (rc == -1) {
1463                                 Debug( LDAP_DEBUG_ANY, "ber_write failed\n", 0, 0, 0 );
1464                                 return rc;
1465                         }
1466                 }
1467         }
1468 #endif /* LDAP_CONNECTIONLESS */
1469
1470         rc = 0;
1471
1472         /* Don't process requests when the conn is in the middle of a
1473          * Bind, or if it's closing. Also, don't let any single conn
1474          * use up all the available threads, and don't execute if we're
1475          * currently blocked on output. And don't execute if there are
1476          * already pending ops, let them go first.  Abandon operations
1477          * get exceptions to some, but not all, cases.
1478          */
1479         if (tag != LDAP_REQ_ABANDON && conn->c_conn_state == SLAP_C_CLOSING) {
1480                 defer = "closing";
1481         } else if (tag != LDAP_REQ_ABANDON && conn->c_writewaiter) {
1482                 defer = "awaiting write";
1483         } else if (conn->c_n_ops_executing >= connection_pool_max/2) {
1484                 defer = "too many executing";
1485         } else if (conn->c_conn_state == SLAP_C_BINDING) {
1486                 defer = "binding";
1487         } else if (tag != LDAP_REQ_ABANDON && conn->c_n_ops_pending) {
1488                 defer = "pending operations";
1489         }
1490
1491         if( defer ) {
1492                 int max = conn->c_dn.bv_len
1493                         ? slap_conn_max_pending_auth
1494                         : slap_conn_max_pending;
1495
1496                 Debug( LDAP_DEBUG_ANY,
1497                         "connection_input: conn=%lu deferring operation: %s\n",
1498                         conn->c_connid, defer, 0 );
1499                 conn->c_n_ops_pending++;
1500                 LDAP_STAILQ_INSERT_TAIL( &conn->c_pending_ops, op, o_next );
1501                 if ( conn->c_n_ops_pending > max ) {
1502                         rc = -1;
1503                 } else {
1504                         rc = 1;
1505                 }
1506         } else {
1507                 conn->c_n_ops_executing++;
1508                 connection_op_activate( op );
1509         }
1510
1511 #ifdef NO_THREADS
1512         if ( conn->c_struct_state != SLAP_C_USED ) {
1513                 /* connection must have got closed underneath us */
1514                 return 1;
1515         }
1516 #endif
1517         assert( conn->c_struct_state == SLAP_C_USED );
1518
1519         return rc;
1520 }
1521
1522 static int
1523 connection_resched( Connection *conn )
1524 {
1525         Operation *op;
1526
1527         if( conn->c_conn_state == SLAP_C_CLOSING ) {
1528                 int rc;
1529                 ber_socket_t    sd;
1530                 ber_sockbuf_ctrl( conn->c_sb, LBER_SB_OPT_GET_FD, &sd );
1531
1532                 /* use trylock to avoid possible deadlock */
1533                 rc = ldap_pvt_thread_mutex_trylock( &connections_mutex );
1534
1535                 if( rc ) {
1536                         Debug( LDAP_DEBUG_TRACE,
1537                                 "connection_resched: reaquiring locks conn=%lu sd=%d\n",
1538                                 conn->c_connid, sd, 0 );
1539                         /*
1540                          * reaquire locks in the right order...
1541                          * this may allow another thread to close this connection,
1542                          * so recheck state below.
1543                          */
1544                         ldap_pvt_thread_mutex_unlock( &conn->c_mutex );
1545                         ldap_pvt_thread_mutex_lock( &connections_mutex );
1546                         ldap_pvt_thread_mutex_lock( &conn->c_mutex );
1547                 }
1548
1549                 if( conn->c_conn_state != SLAP_C_CLOSING ) {
1550                         Debug( LDAP_DEBUG_TRACE, "connection_resched: "
1551                                 "closed by other thread conn=%lu sd=%d\n",
1552                                 conn->c_connid, sd, 0 );
1553                 } else {
1554                         Debug( LDAP_DEBUG_TRACE, "connection_resched: "
1555                                 "attempting closing conn=%lu sd=%d\n",
1556                                 conn->c_connid, sd, 0 );
1557                         connection_close( conn );
1558                 }
1559
1560                 ldap_pvt_thread_mutex_unlock( &connections_mutex );
1561                 return 0;
1562         }
1563
1564         if( conn->c_conn_state != SLAP_C_ACTIVE || conn->c_writewaiter ) {
1565                 /* other states need different handling */
1566                 return 0;
1567         }
1568
1569         while ((op = LDAP_STAILQ_FIRST( &conn->c_pending_ops )) != NULL) {
1570                 if ( conn->c_n_ops_executing > connection_pool_max/2 ) {
1571                         break;
1572                 }
1573                 LDAP_STAILQ_REMOVE_HEAD( &conn->c_pending_ops, o_next );
1574                 LDAP_STAILQ_NEXT(op, o_next) = NULL;
1575                 /* pending operations should not be marked for abandonment */
1576                 assert(!op->o_abandon);
1577
1578                 conn->c_n_ops_pending--;
1579                 conn->c_n_ops_executing++;
1580
1581                 connection_op_activate( op );
1582
1583                 if ( conn->c_conn_state == SLAP_C_BINDING ) {
1584                         break;
1585                 }
1586         }
1587         return 0;
1588 }
1589
1590 static void
1591 connection_init_log_prefix( Operation *op )
1592 {
1593         if ( op->o_connid == (unsigned long)(-1) ) {
1594                 snprintf( op->o_log_prefix, sizeof( op->o_log_prefix ),
1595                                 "conn=-1 op=%lu", op->o_opid );
1596
1597         } else {
1598                 snprintf( op->o_log_prefix, sizeof( op->o_log_prefix ),
1599                                 "conn=%lu op=%lu", op->o_connid, op->o_opid );
1600         }
1601 }
1602
1603 static int connection_op_activate( Operation *op )
1604 {
1605         int status;
1606         ber_tag_t tag = op->o_tag;
1607
1608         if(tag == LDAP_REQ_BIND) {
1609                 op->o_conn->c_conn_state = SLAP_C_BINDING;
1610         }
1611
1612         if (!op->o_dn.bv_len) {
1613                 op->o_authz = op->o_conn->c_authz;
1614                 ber_dupbv( &op->o_dn, &op->o_conn->c_dn );
1615                 ber_dupbv( &op->o_ndn, &op->o_conn->c_ndn );
1616         }
1617         op->o_authtype = op->o_conn->c_authtype;
1618         ber_dupbv( &op->o_authmech, &op->o_conn->c_authmech );
1619
1620         if (!op->o_protocol) {
1621                 op->o_protocol = op->o_conn->c_protocol
1622                         ? op->o_conn->c_protocol : LDAP_VERSION3;
1623         }
1624         if (op->o_conn->c_conn_state == SLAP_C_INACTIVE
1625                 && op->o_protocol > LDAP_VERSION2)
1626         {
1627                 op->o_conn->c_conn_state = SLAP_C_ACTIVE;
1628         }
1629
1630         op->o_connid = op->o_conn->c_connid;
1631         connection_init_log_prefix( op );
1632
1633         LDAP_STAILQ_INSERT_TAIL( &op->o_conn->c_ops, op, o_next );
1634
1635         status = ldap_pvt_thread_pool_submit( &connection_pool,
1636                 connection_operation, (void *) op );
1637
1638         if ( status != 0 ) {
1639                 Debug( LDAP_DEBUG_ANY,
1640                         "ldap_pvt_thread_pool_submit: failed (%d) for conn=%lu\n",
1641                         status, op->o_connid, 0 );
1642                 /* should move op to pending list */
1643         }
1644
1645         return status;
1646 }
1647
1648 int connection_write(ber_socket_t s)
1649 {
1650         Connection *c;
1651
1652         assert( connections != NULL );
1653
1654         ldap_pvt_thread_mutex_lock( &connections_mutex );
1655
1656         c = connection_get( s );
1657
1658         slapd_clr_write( s, 0);
1659
1660         if( c == NULL ) {
1661                 Debug( LDAP_DEBUG_ANY,
1662                         "connection_write(%ld): no connection!\n",
1663                         (long)s, 0, 0 );
1664                 slapd_remove(s, 1, 0);
1665                 ldap_pvt_thread_mutex_unlock( &connections_mutex );
1666                 return -1;
1667         }
1668
1669         c->c_n_write++;
1670
1671         Debug( LDAP_DEBUG_TRACE,
1672                 "connection_write(%d): waking output for id=%lu\n",
1673                 s, c->c_connid, 0 );
1674         ldap_pvt_thread_cond_signal( &c->c_write_cv );
1675
1676         if ( ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_NEEDS_READ, NULL ) ) {
1677                 slapd_set_read( s, 1 );
1678         }
1679         if ( ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_NEEDS_WRITE, NULL ) ) {
1680                 slapd_set_write( s, 1 );
1681         }
1682         connection_return( c );
1683         ldap_pvt_thread_mutex_unlock( &connections_mutex );
1684         return 0;
1685 }
1686
1687 void
1688 connection_fake_init(
1689         Connection *conn,
1690         Operation *op,
1691         void *ctx )
1692 {
1693         conn->c_connid = -1;
1694         conn->c_send_ldap_result = slap_send_ldap_result;
1695         conn->c_send_search_entry = slap_send_search_entry;
1696         conn->c_send_search_reference = slap_send_search_reference;
1697         conn->c_listener = (Listener *)&dummy_list;
1698         conn->c_peer_domain = slap_empty_bv;
1699         conn->c_peer_name = slap_empty_bv;
1700
1701         memset(op, 0, OPERATION_BUFFER_SIZE);
1702         op->o_hdr = (Opheader *)(op+1);
1703         op->o_controls = (void **)(op->o_hdr+1);
1704         /* set memory context */
1705         op->o_tmpmemctx = slap_sl_mem_create(SLAP_SLAB_SIZE, SLAP_SLAB_STACK, ctx);
1706         op->o_tmpmfuncs = &slap_sl_mfuncs;
1707         op->o_threadctx = ctx;
1708
1709         op->o_conn = conn;
1710         op->o_connid = op->o_conn->c_connid;
1711         connection_init_log_prefix( op );
1712
1713         op->o_time = slap_get_time();
1714 }
1715
1716 void
1717 connection_assign_nextid( Connection *conn )
1718 {
1719         ldap_pvt_thread_mutex_lock( &conn_nextid_mutex );
1720         conn->c_connid = conn_nextid++;
1721         ldap_pvt_thread_mutex_unlock( &conn_nextid_mutex );
1722 }
1723